1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 #include "got_keyword.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #define CTRL(x)		((x) & 0x1f)
70 
71 #ifndef nitems
72 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
73 #endif
74 
75 struct tog_cmd {
76 	const char *name;
77 	const struct got_error *(*cmd_main)(int, char *[]);
78 	void (*cmd_usage)(void);
79 };
80 
81 __dead static void	usage(int, int);
82 __dead static void	usage_log(void);
83 __dead static void	usage_diff(void);
84 __dead static void	usage_blame(void);
85 __dead static void	usage_tree(void);
86 __dead static void	usage_ref(void);
87 
88 static const struct got_error*	cmd_log(int, char *[]);
89 static const struct got_error*	cmd_diff(int, char *[]);
90 static const struct got_error*	cmd_blame(int, char *[]);
91 static const struct got_error*	cmd_tree(int, char *[]);
92 static const struct got_error*	cmd_ref(int, char *[]);
93 
94 static const struct tog_cmd tog_commands[] = {
95 	{ "log",	cmd_log,	usage_log },
96 	{ "diff",	cmd_diff,	usage_diff },
97 	{ "blame",	cmd_blame,	usage_blame },
98 	{ "tree",	cmd_tree,	usage_tree },
99 	{ "ref",	cmd_ref,	usage_ref },
100 };
101 
102 enum tog_view_type {
103 	TOG_VIEW_DIFF,
104 	TOG_VIEW_LOG,
105 	TOG_VIEW_BLAME,
106 	TOG_VIEW_TREE,
107 	TOG_VIEW_REF,
108 	TOG_VIEW_HELP
109 };
110 
111 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
112 enum tog_keymap_type {
113 	TOG_KEYMAP_KEYS = -2,
114 	TOG_KEYMAP_GLOBAL,
115 	TOG_KEYMAP_DIFF,
116 	TOG_KEYMAP_LOG,
117 	TOG_KEYMAP_BLAME,
118 	TOG_KEYMAP_TREE,
119 	TOG_KEYMAP_REF,
120 	TOG_KEYMAP_HELP
121 };
122 
123 enum tog_view_mode {
124 	TOG_VIEW_SPLIT_NONE,
125 	TOG_VIEW_SPLIT_VERT,
126 	TOG_VIEW_SPLIT_HRZN
127 };
128 
129 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
130 
131 #define TOG_EOF_STRING	"(END)"
132 
133 struct commit_queue_entry {
134 	TAILQ_ENTRY(commit_queue_entry) entry;
135 	struct got_object_id *id;
136 	struct got_commit_object *commit;
137 	int idx;
138 };
139 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
140 struct commit_queue {
141 	int ncommits;
142 	struct commit_queue_head head;
143 };
144 
145 struct tog_color {
146 	STAILQ_ENTRY(tog_color) entry;
147 	regex_t regex;
148 	short colorpair;
149 };
150 STAILQ_HEAD(tog_colors, tog_color);
151 
152 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
153 static struct got_reflist_object_id_map *tog_refs_idmap;
154 static struct {
155 	struct got_object_id	*id;
156 	int			 idx;
157 	char			 marker;
158 } tog_base_commit;
159 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
160 
161 static const struct got_error *
162 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
163     struct got_reference* re2)
164 {
165 	const char *name1 = got_ref_get_name(re1);
166 	const char *name2 = got_ref_get_name(re2);
167 	int isbackup1, isbackup2;
168 
169 	/* Sort backup refs towards the bottom of the list. */
170 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
171 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
172 	if (!isbackup1 && isbackup2) {
173 		*cmp = -1;
174 		return NULL;
175 	} else if (isbackup1 && !isbackup2) {
176 		*cmp = 1;
177 		return NULL;
178 	}
179 
180 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
181 	return NULL;
182 }
183 
184 static const struct got_error *
185 tog_load_refs(struct got_repository *repo, int sort_by_date)
186 {
187 	const struct got_error *err;
188 
189 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
190 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
191 	    repo);
192 	if (err)
193 		return err;
194 
195 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
196 	    repo);
197 }
198 
199 static void
200 tog_free_refs(void)
201 {
202 	if (tog_refs_idmap) {
203 		got_reflist_object_id_map_free(tog_refs_idmap);
204 		tog_refs_idmap = NULL;
205 	}
206 	got_ref_list_free(&tog_refs);
207 }
208 
209 static const struct got_error *
210 add_color(struct tog_colors *colors, const char *pattern,
211     int idx, short color)
212 {
213 	const struct got_error *err = NULL;
214 	struct tog_color *tc;
215 	int regerr = 0;
216 
217 	if (idx < 1 || idx > COLOR_PAIRS - 1)
218 		return NULL;
219 
220 	init_pair(idx, color, -1);
221 
222 	tc = calloc(1, sizeof(*tc));
223 	if (tc == NULL)
224 		return got_error_from_errno("calloc");
225 	regerr = regcomp(&tc->regex, pattern,
226 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
227 	if (regerr) {
228 		static char regerr_msg[512];
229 		static char err_msg[512];
230 		regerror(regerr, &tc->regex, regerr_msg,
231 		    sizeof(regerr_msg));
232 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
233 		    regerr_msg);
234 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
235 		free(tc);
236 		return err;
237 	}
238 	tc->colorpair = idx;
239 	STAILQ_INSERT_HEAD(colors, tc, entry);
240 	return NULL;
241 }
242 
243 static void
244 free_colors(struct tog_colors *colors)
245 {
246 	struct tog_color *tc;
247 
248 	while (!STAILQ_EMPTY(colors)) {
249 		tc = STAILQ_FIRST(colors);
250 		STAILQ_REMOVE_HEAD(colors, entry);
251 		regfree(&tc->regex);
252 		free(tc);
253 	}
254 }
255 
256 static struct tog_color *
257 get_color(struct tog_colors *colors, int colorpair)
258 {
259 	struct tog_color *tc = NULL;
260 
261 	STAILQ_FOREACH(tc, colors, entry) {
262 		if (tc->colorpair == colorpair)
263 			return tc;
264 	}
265 
266 	return NULL;
267 }
268 
269 static int
270 default_color_value(const char *envvar)
271 {
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
273 		return COLOR_MAGENTA;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
275 		return COLOR_CYAN;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
279 		return COLOR_GREEN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
283 		return COLOR_MAGENTA;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
291 		return COLOR_CYAN;
292 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
295 		return COLOR_GREEN;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
297 		return COLOR_MAGENTA;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
299 		return COLOR_YELLOW;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
301 		return COLOR_CYAN;
302 
303 	return -1;
304 }
305 
306 static int
307 get_color_value(const char *envvar)
308 {
309 	const char *val = getenv(envvar);
310 
311 	if (val == NULL)
312 		return default_color_value(envvar);
313 
314 	if (strcasecmp(val, "black") == 0)
315 		return COLOR_BLACK;
316 	if (strcasecmp(val, "red") == 0)
317 		return COLOR_RED;
318 	if (strcasecmp(val, "green") == 0)
319 		return COLOR_GREEN;
320 	if (strcasecmp(val, "yellow") == 0)
321 		return COLOR_YELLOW;
322 	if (strcasecmp(val, "blue") == 0)
323 		return COLOR_BLUE;
324 	if (strcasecmp(val, "magenta") == 0)
325 		return COLOR_MAGENTA;
326 	if (strcasecmp(val, "cyan") == 0)
327 		return COLOR_CYAN;
328 	if (strcasecmp(val, "white") == 0)
329 		return COLOR_WHITE;
330 	if (strcasecmp(val, "default") == 0)
331 		return -1;
332 
333 	return default_color_value(envvar);
334 }
335 
336 struct tog_diff_view_state {
337 	struct got_object_id *id1, *id2;
338 	const char *label1, *label2;
339 	FILE *f, *f1, *f2;
340 	int fd1, fd2;
341 	int lineno;
342 	int first_displayed_line;
343 	int last_displayed_line;
344 	int eof;
345 	int diff_context;
346 	int ignore_whitespace;
347 	int force_text_diff;
348 	struct got_repository *repo;
349 	struct got_diff_line *lines;
350 	size_t nlines;
351 	int matched_line;
352 	int selected_line;
353 
354 	/* passed from log or blame view; may be NULL */
355 	struct tog_view *parent_view;
356 };
357 
358 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
359 static volatile sig_atomic_t tog_thread_error;
360 
361 struct tog_log_thread_args {
362 	pthread_cond_t need_commits;
363 	pthread_cond_t commit_loaded;
364 	int commits_needed;
365 	int load_all;
366 	struct got_commit_graph *graph;
367 	struct commit_queue *real_commits;
368 	const char *in_repo_path;
369 	struct got_object_id *start_id;
370 	struct got_repository *repo;
371 	int *pack_fds;
372 	int log_complete;
373 	pthread_cond_t log_loaded;
374 	sig_atomic_t *quit;
375 	struct commit_queue_entry **first_displayed_entry;
376 	struct commit_queue_entry **selected_entry;
377 	int *searching;
378 	int *search_next_done;
379 	regex_t *regex;
380 	int *limiting;
381 	int limit_match;
382 	regex_t *limit_regex;
383 	struct commit_queue *limit_commits;
384 	struct got_worktree *worktree;
385 	int need_commit_marker;
386 };
387 
388 struct tog_log_view_state {
389 	struct commit_queue *commits;
390 	struct commit_queue_entry *first_displayed_entry;
391 	struct commit_queue_entry *last_displayed_entry;
392 	struct commit_queue_entry *selected_entry;
393 	struct commit_queue real_commits;
394 	int selected;
395 	char *in_repo_path;
396 	char *head_ref_name;
397 	int log_branches;
398 	struct got_repository *repo;
399 	struct got_object_id *start_id;
400 	sig_atomic_t quit;
401 	pthread_t thread;
402 	struct tog_log_thread_args thread_args;
403 	struct commit_queue_entry *matched_entry;
404 	struct commit_queue_entry *search_entry;
405 	struct tog_colors colors;
406 	int use_committer;
407 	int limit_view;
408 	regex_t limit_regex;
409 	struct commit_queue limit_commits;
410 };
411 
412 #define TOG_COLOR_DIFF_MINUS		1
413 #define TOG_COLOR_DIFF_PLUS		2
414 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
415 #define TOG_COLOR_DIFF_META		4
416 #define TOG_COLOR_TREE_SUBMODULE	5
417 #define TOG_COLOR_TREE_SYMLINK		6
418 #define TOG_COLOR_TREE_DIRECTORY	7
419 #define TOG_COLOR_TREE_EXECUTABLE	8
420 #define TOG_COLOR_COMMIT		9
421 #define TOG_COLOR_AUTHOR		10
422 #define TOG_COLOR_DATE			11
423 #define TOG_COLOR_REFS_HEADS		12
424 #define TOG_COLOR_REFS_TAGS		13
425 #define TOG_COLOR_REFS_REMOTES		14
426 #define TOG_COLOR_REFS_BACKUP		15
427 
428 struct tog_blame_cb_args {
429 	struct tog_blame_line *lines; /* one per line */
430 	int nlines;
431 
432 	struct tog_view *view;
433 	struct got_object_id *commit_id;
434 	int *quit;
435 };
436 
437 struct tog_blame_thread_args {
438 	const char *path;
439 	struct got_repository *repo;
440 	struct tog_blame_cb_args *cb_args;
441 	int *complete;
442 	got_cancel_cb cancel_cb;
443 	void *cancel_arg;
444 	pthread_cond_t blame_complete;
445 };
446 
447 struct tog_blame {
448 	FILE *f;
449 	off_t filesize;
450 	struct tog_blame_line *lines;
451 	int nlines;
452 	off_t *line_offsets;
453 	pthread_t thread;
454 	struct tog_blame_thread_args thread_args;
455 	struct tog_blame_cb_args cb_args;
456 	const char *path;
457 	int *pack_fds;
458 };
459 
460 struct tog_blame_view_state {
461 	int first_displayed_line;
462 	int last_displayed_line;
463 	int selected_line;
464 	int last_diffed_line;
465 	int blame_complete;
466 	int eof;
467 	int done;
468 	struct got_object_id_queue blamed_commits;
469 	struct got_object_qid *blamed_commit;
470 	char *path;
471 	struct got_repository *repo;
472 	struct got_object_id *commit_id;
473 	struct got_object_id *id_to_log;
474 	struct tog_blame blame;
475 	int matched_line;
476 	struct tog_colors colors;
477 };
478 
479 struct tog_parent_tree {
480 	TAILQ_ENTRY(tog_parent_tree) entry;
481 	struct got_tree_object *tree;
482 	struct got_tree_entry *first_displayed_entry;
483 	struct got_tree_entry *selected_entry;
484 	int selected;
485 };
486 
487 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
488 
489 struct tog_tree_view_state {
490 	char *tree_label;
491 	struct got_object_id *commit_id;/* commit which this tree belongs to */
492 	struct got_tree_object *root;	/* the commit's root tree entry */
493 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
494 	struct got_tree_entry *first_displayed_entry;
495 	struct got_tree_entry *last_displayed_entry;
496 	struct got_tree_entry *selected_entry;
497 	int ndisplayed, selected, show_ids;
498 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
499 	char *head_ref_name;
500 	struct got_repository *repo;
501 	struct got_tree_entry *matched_entry;
502 	struct tog_colors colors;
503 };
504 
505 struct tog_reflist_entry {
506 	TAILQ_ENTRY(tog_reflist_entry) entry;
507 	struct got_reference *ref;
508 	int idx;
509 };
510 
511 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
512 
513 struct tog_ref_view_state {
514 	struct tog_reflist_head refs;
515 	struct tog_reflist_entry *first_displayed_entry;
516 	struct tog_reflist_entry *last_displayed_entry;
517 	struct tog_reflist_entry *selected_entry;
518 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
519 	struct got_repository *repo;
520 	struct tog_reflist_entry *matched_entry;
521 	struct tog_colors colors;
522 };
523 
524 struct tog_help_view_state {
525 	FILE			*f;
526 	off_t			*line_offsets;
527 	size_t			 nlines;
528 	int			 lineno;
529 	int			 first_displayed_line;
530 	int			 last_displayed_line;
531 	int			 eof;
532 	int			 matched_line;
533 	int			 selected_line;
534 	int			 all;
535 	enum tog_keymap_type	 type;
536 };
537 
538 #define GENERATE_HELP \
539 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
540 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
541 	KEY_("k C-p Up", "Move cursor or page up one line"), \
542 	KEY_("j C-n Down", "Move cursor or page down one line"), \
543 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
544 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
545 	KEY_("C-u u", "Scroll the view up one half page"), \
546 	KEY_("C-d d", "Scroll the view down one half page"), \
547 	KEY_("g", "Go to line N (default: first line)"), \
548 	KEY_("Home =", "Go to the first line"), \
549 	KEY_("G", "Go to line N (default: last line)"), \
550 	KEY_("End *", "Go to the last line"), \
551 	KEY_("l Right", "Scroll the view right"), \
552 	KEY_("h Left", "Scroll the view left"), \
553 	KEY_("$", "Scroll view to the rightmost position"), \
554 	KEY_("0", "Scroll view to the leftmost position"), \
555 	KEY_("-", "Decrease size of the focussed split"), \
556 	KEY_("+", "Increase size of the focussed split"), \
557 	KEY_("Tab", "Switch focus between views"), \
558 	KEY_("F", "Toggle fullscreen mode"), \
559 	KEY_("S", "Switch split-screen layout"), \
560 	KEY_("/", "Open prompt to enter search term"), \
561 	KEY_("n", "Find next line/token matching the current search term"), \
562 	KEY_("N", "Find previous line/token matching the current search term"),\
563 	KEY_("q", "Quit the focussed view; Quit help screen"), \
564 	KEY_("Q", "Quit tog"), \
565 	\
566 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
567 	KEY_("< ,", "Move cursor up one commit"), \
568 	KEY_("> .", "Move cursor down one commit"), \
569 	KEY_("Enter", "Open diff view of the selected commit"), \
570 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
571 	KEY_("R", "Open ref view of all repository references"), \
572 	KEY_("T", "Display tree view of the repository from the selected" \
573 	    " commit"), \
574 	KEY_("@", "Toggle between displaying author and committer name"), \
575 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
576 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
577 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
578 	\
579 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
580 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
581 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
582 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
583 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
584 	    " data"), \
585 	KEY_("(", "Go to the previous file in the diff"), \
586 	KEY_(")", "Go to the next file in the diff"), \
587 	KEY_("{", "Go to the previous hunk in the diff"), \
588 	KEY_("}", "Go to the next hunk in the diff"), \
589 	KEY_("[", "Decrease the number of context lines"), \
590 	KEY_("]", "Increase the number of context lines"), \
591 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
592 	\
593 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
594 	KEY_("Enter", "Display diff view of the selected line's commit"), \
595 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
596 	KEY_("L", "Open log view for the currently selected annotated line"), \
597 	KEY_("C", "Reload view with the previously blamed commit"), \
598 	KEY_("c", "Reload view with the version of the file found in the" \
599 	    " selected line's commit"), \
600 	KEY_("p", "Reload view with the version of the file found in the" \
601 	    " selected line's parent commit"), \
602 	\
603 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
604 	KEY_("Enter", "Enter selected directory or open blame view of the" \
605 	    " selected file"), \
606 	KEY_("L", "Open log view for the selected entry"), \
607 	KEY_("R", "Open ref view of all repository references"), \
608 	KEY_("i", "Show object IDs for all tree entries"), \
609 	KEY_("Backspace", "Return to the parent directory"), \
610 	\
611 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
612 	KEY_("Enter", "Display log view of the selected reference"), \
613 	KEY_("T", "Display tree view of the selected reference"), \
614 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
615 	KEY_("m", "Toggle display of last modified date for each reference"), \
616 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
617 	KEY_("C-l", "Reload view with all repository references")
618 
619 struct tog_key_map {
620 	const char		*keys;
621 	const char		*info;
622 	enum tog_keymap_type	 type;
623 };
624 
625 /* curses io for tog regress */
626 struct tog_io {
627 	FILE	*cin;
628 	FILE	*cout;
629 	FILE	*f;
630 	FILE	*sdump;
631 	char	*input_str;
632 	int	 wait_for_ui;
633 } tog_io;
634 static int using_mock_io;
635 
636 #define TOG_KEY_SCRDUMP	SHRT_MIN
637 
638 /*
639  * We implement two types of views: parent views and child views.
640  *
641  * The 'Tab' key switches focus between a parent view and its child view.
642  * Child views are shown side-by-side to their parent view, provided
643  * there is enough screen estate.
644  *
645  * When a new view is opened from within a parent view, this new view
646  * becomes a child view of the parent view, replacing any existing child.
647  *
648  * When a new view is opened from within a child view, this new view
649  * becomes a parent view which will obscure the views below until the
650  * user quits the new parent view by typing 'q'.
651  *
652  * This list of views contains parent views only.
653  * Child views are only pointed to by their parent view.
654  */
655 TAILQ_HEAD(tog_view_list_head, tog_view);
656 
657 struct tog_view {
658 	TAILQ_ENTRY(tog_view) entry;
659 	WINDOW *window;
660 	PANEL *panel;
661 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
662 	int resized_y, resized_x; /* begin_y/x based on user resizing */
663 	int maxx, x; /* max column and current start column */
664 	int lines, cols; /* copies of LINES and COLS */
665 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
666 	int gline, hiline; /* navigate to and highlight this nG line */
667 	int ch, count; /* current keymap and count prefix */
668 	int resized; /* set when in a resize event */
669 	int focussed; /* Only set on one parent or child view at a time. */
670 	int dying;
671 	struct tog_view *parent;
672 	struct tog_view *child;
673 
674 	/*
675 	 * This flag is initially set on parent views when a new child view
676 	 * is created. It gets toggled when the 'Tab' key switches focus
677 	 * between parent and child.
678 	 * The flag indicates whether focus should be passed on to our child
679 	 * view if this parent view gets picked for focus after another parent
680 	 * view was closed. This prevents child views from losing focus in such
681 	 * situations.
682 	 */
683 	int focus_child;
684 
685 	enum tog_view_mode mode;
686 	/* type-specific state */
687 	enum tog_view_type type;
688 	union {
689 		struct tog_diff_view_state diff;
690 		struct tog_log_view_state log;
691 		struct tog_blame_view_state blame;
692 		struct tog_tree_view_state tree;
693 		struct tog_ref_view_state ref;
694 		struct tog_help_view_state help;
695 	} state;
696 
697 	const struct got_error *(*show)(struct tog_view *);
698 	const struct got_error *(*input)(struct tog_view **,
699 	    struct tog_view *, int);
700 	const struct got_error *(*reset)(struct tog_view *);
701 	const struct got_error *(*resize)(struct tog_view *, int);
702 	const struct got_error *(*close)(struct tog_view *);
703 
704 	const struct got_error *(*search_start)(struct tog_view *);
705 	const struct got_error *(*search_next)(struct tog_view *);
706 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
707 	    int **, int **, int **, int **);
708 	int search_started;
709 	int searching;
710 #define TOG_SEARCH_FORWARD	1
711 #define TOG_SEARCH_BACKWARD	2
712 	int search_next_done;
713 #define TOG_SEARCH_HAVE_MORE	1
714 #define TOG_SEARCH_NO_MORE	2
715 #define TOG_SEARCH_HAVE_NONE	3
716 	regex_t regex;
717 	regmatch_t regmatch;
718 	const char *action;
719 };
720 
721 static const struct got_error *open_diff_view(struct tog_view *,
722     struct got_object_id *, struct got_object_id *,
723     const char *, const char *, int, int, int, struct tog_view *,
724     struct got_repository *);
725 static const struct got_error *show_diff_view(struct tog_view *);
726 static const struct got_error *input_diff_view(struct tog_view **,
727     struct tog_view *, int);
728 static const struct got_error *reset_diff_view(struct tog_view *);
729 static const struct got_error* close_diff_view(struct tog_view *);
730 static const struct got_error *search_start_diff_view(struct tog_view *);
731 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
732     size_t *, int **, int **, int **, int **);
733 static const struct got_error *search_next_view_match(struct tog_view *);
734 
735 static const struct got_error *open_log_view(struct tog_view *,
736     struct got_object_id *, struct got_repository *,
737     const char *, const char *, int, struct got_worktree *);
738 static const struct got_error * show_log_view(struct tog_view *);
739 static const struct got_error *input_log_view(struct tog_view **,
740     struct tog_view *, int);
741 static const struct got_error *resize_log_view(struct tog_view *, int);
742 static const struct got_error *close_log_view(struct tog_view *);
743 static const struct got_error *search_start_log_view(struct tog_view *);
744 static const struct got_error *search_next_log_view(struct tog_view *);
745 
746 static const struct got_error *open_blame_view(struct tog_view *, char *,
747     struct got_object_id *, struct got_repository *);
748 static const struct got_error *show_blame_view(struct tog_view *);
749 static const struct got_error *input_blame_view(struct tog_view **,
750     struct tog_view *, int);
751 static const struct got_error *reset_blame_view(struct tog_view *);
752 static const struct got_error *close_blame_view(struct tog_view *);
753 static const struct got_error *search_start_blame_view(struct tog_view *);
754 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
755     size_t *, int **, int **, int **, int **);
756 
757 static const struct got_error *open_tree_view(struct tog_view *,
758     struct got_object_id *, const char *, struct got_repository *);
759 static const struct got_error *show_tree_view(struct tog_view *);
760 static const struct got_error *input_tree_view(struct tog_view **,
761     struct tog_view *, int);
762 static const struct got_error *close_tree_view(struct tog_view *);
763 static const struct got_error *search_start_tree_view(struct tog_view *);
764 static const struct got_error *search_next_tree_view(struct tog_view *);
765 
766 static const struct got_error *open_ref_view(struct tog_view *,
767     struct got_repository *);
768 static const struct got_error *show_ref_view(struct tog_view *);
769 static const struct got_error *input_ref_view(struct tog_view **,
770     struct tog_view *, int);
771 static const struct got_error *close_ref_view(struct tog_view *);
772 static const struct got_error *search_start_ref_view(struct tog_view *);
773 static const struct got_error *search_next_ref_view(struct tog_view *);
774 
775 static const struct got_error *open_help_view(struct tog_view *,
776     struct tog_view *);
777 static const struct got_error *show_help_view(struct tog_view *);
778 static const struct got_error *input_help_view(struct tog_view **,
779     struct tog_view *, int);
780 static const struct got_error *reset_help_view(struct tog_view *);
781 static const struct got_error* close_help_view(struct tog_view *);
782 static const struct got_error *search_start_help_view(struct tog_view *);
783 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
784     size_t *, int **, int **, int **, int **);
785 
786 static volatile sig_atomic_t tog_sigwinch_received;
787 static volatile sig_atomic_t tog_sigpipe_received;
788 static volatile sig_atomic_t tog_sigcont_received;
789 static volatile sig_atomic_t tog_sigint_received;
790 static volatile sig_atomic_t tog_sigterm_received;
791 
792 static void
793 tog_sigwinch(int signo)
794 {
795 	tog_sigwinch_received = 1;
796 }
797 
798 static void
799 tog_sigpipe(int signo)
800 {
801 	tog_sigpipe_received = 1;
802 }
803 
804 static void
805 tog_sigcont(int signo)
806 {
807 	tog_sigcont_received = 1;
808 }
809 
810 static void
811 tog_sigint(int signo)
812 {
813 	tog_sigint_received = 1;
814 }
815 
816 static void
817 tog_sigterm(int signo)
818 {
819 	tog_sigterm_received = 1;
820 }
821 
822 static int
823 tog_fatal_signal_received(void)
824 {
825 	return (tog_sigpipe_received ||
826 	    tog_sigint_received || tog_sigterm_received);
827 }
828 
829 static const struct got_error *
830 view_close(struct tog_view *view)
831 {
832 	const struct got_error *err = NULL, *child_err = NULL;
833 
834 	if (view->child) {
835 		child_err = view_close(view->child);
836 		view->child = NULL;
837 	}
838 	if (view->close)
839 		err = view->close(view);
840 	if (view->panel)
841 		del_panel(view->panel);
842 	if (view->window)
843 		delwin(view->window);
844 	free(view);
845 	return err ? err : child_err;
846 }
847 
848 static struct tog_view *
849 view_open(int nlines, int ncols, int begin_y, int begin_x,
850     enum tog_view_type type)
851 {
852 	struct tog_view *view = calloc(1, sizeof(*view));
853 
854 	if (view == NULL)
855 		return NULL;
856 
857 	view->type = type;
858 	view->lines = LINES;
859 	view->cols = COLS;
860 	view->nlines = nlines ? nlines : LINES - begin_y;
861 	view->ncols = ncols ? ncols : COLS - begin_x;
862 	view->begin_y = begin_y;
863 	view->begin_x = begin_x;
864 	view->window = newwin(nlines, ncols, begin_y, begin_x);
865 	if (view->window == NULL) {
866 		view_close(view);
867 		return NULL;
868 	}
869 	view->panel = new_panel(view->window);
870 	if (view->panel == NULL ||
871 	    set_panel_userptr(view->panel, view) != OK) {
872 		view_close(view);
873 		return NULL;
874 	}
875 
876 	keypad(view->window, TRUE);
877 	return view;
878 }
879 
880 static int
881 view_split_begin_x(int begin_x)
882 {
883 	if (begin_x > 0 || COLS < 120)
884 		return 0;
885 	return (COLS - MAX(COLS / 2, 80));
886 }
887 
888 /* XXX Stub till we decide what to do. */
889 static int
890 view_split_begin_y(int lines)
891 {
892 	return lines * HSPLIT_SCALE;
893 }
894 
895 static const struct got_error *view_resize(struct tog_view *);
896 
897 static const struct got_error *
898 view_splitscreen(struct tog_view *view)
899 {
900 	const struct got_error *err = NULL;
901 
902 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
903 		if (view->resized_y && view->resized_y < view->lines)
904 			view->begin_y = view->resized_y;
905 		else
906 			view->begin_y = view_split_begin_y(view->nlines);
907 		view->begin_x = 0;
908 	} else if (!view->resized) {
909 		if (view->resized_x && view->resized_x < view->cols - 1 &&
910 		    view->cols > 119)
911 			view->begin_x = view->resized_x;
912 		else
913 			view->begin_x = view_split_begin_x(0);
914 		view->begin_y = 0;
915 	}
916 	view->nlines = LINES - view->begin_y;
917 	view->ncols = COLS - view->begin_x;
918 	view->lines = LINES;
919 	view->cols = COLS;
920 	err = view_resize(view);
921 	if (err)
922 		return err;
923 
924 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
925 		view->parent->nlines = view->begin_y;
926 
927 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
928 		return got_error_from_errno("mvwin");
929 
930 	return NULL;
931 }
932 
933 static const struct got_error *
934 view_fullscreen(struct tog_view *view)
935 {
936 	const struct got_error *err = NULL;
937 
938 	view->begin_x = 0;
939 	view->begin_y = view->resized ? view->begin_y : 0;
940 	view->nlines = view->resized ? view->nlines : LINES;
941 	view->ncols = COLS;
942 	view->lines = LINES;
943 	view->cols = COLS;
944 	err = view_resize(view);
945 	if (err)
946 		return err;
947 
948 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
949 		return got_error_from_errno("mvwin");
950 
951 	return NULL;
952 }
953 
954 static int
955 view_is_parent_view(struct tog_view *view)
956 {
957 	return view->parent == NULL;
958 }
959 
960 static int
961 view_is_splitscreen(struct tog_view *view)
962 {
963 	return view->begin_x > 0 || view->begin_y > 0;
964 }
965 
966 static int
967 view_is_fullscreen(struct tog_view *view)
968 {
969 	return view->nlines == LINES && view->ncols == COLS;
970 }
971 
972 static int
973 view_is_hsplit_top(struct tog_view *view)
974 {
975 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
976 	    view_is_splitscreen(view->child);
977 }
978 
979 static void
980 view_border(struct tog_view *view)
981 {
982 	PANEL *panel;
983 	const struct tog_view *view_above;
984 
985 	if (view->parent)
986 		return view_border(view->parent);
987 
988 	panel = panel_above(view->panel);
989 	if (panel == NULL)
990 		return;
991 
992 	view_above = panel_userptr(panel);
993 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
994 		mvwhline(view->window, view_above->begin_y - 1,
995 		    view->begin_x, ACS_HLINE, view->ncols);
996 	else
997 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
998 		    ACS_VLINE, view->nlines);
999 }
1000 
1001 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1002 static const struct got_error *request_log_commits(struct tog_view *);
1003 static const struct got_error *offset_selection_down(struct tog_view *);
1004 static void offset_selection_up(struct tog_view *);
1005 static void view_get_split(struct tog_view *, int *, int *);
1006 
1007 static const struct got_error *
1008 view_resize(struct tog_view *view)
1009 {
1010 	const struct got_error	*err = NULL;
1011 	int			 dif, nlines, ncols;
1012 
1013 	dif = LINES - view->lines;  /* line difference */
1014 
1015 	if (view->lines > LINES)
1016 		nlines = view->nlines - (view->lines - LINES);
1017 	else
1018 		nlines = view->nlines + (LINES - view->lines);
1019 	if (view->cols > COLS)
1020 		ncols = view->ncols - (view->cols - COLS);
1021 	else
1022 		ncols = view->ncols + (COLS - view->cols);
1023 
1024 	if (view->child) {
1025 		int hs = view->child->begin_y;
1026 
1027 		if (!view_is_fullscreen(view))
1028 			view->child->begin_x = view_split_begin_x(view->begin_x);
1029 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1030 		    view->child->begin_x == 0) {
1031 			ncols = COLS;
1032 
1033 			view_fullscreen(view->child);
1034 			if (view->child->focussed)
1035 				show_panel(view->child->panel);
1036 			else
1037 				show_panel(view->panel);
1038 		} else {
1039 			ncols = view->child->begin_x;
1040 
1041 			view_splitscreen(view->child);
1042 			show_panel(view->child->panel);
1043 		}
1044 		/*
1045 		 * XXX This is ugly and needs to be moved into the above
1046 		 * logic but "works" for now and my attempts at moving it
1047 		 * break either 'tab' or 'F' key maps in horizontal splits.
1048 		 */
1049 		if (hs) {
1050 			err = view_splitscreen(view->child);
1051 			if (err)
1052 				return err;
1053 			if (dif < 0) { /* top split decreased */
1054 				err = offset_selection_down(view);
1055 				if (err)
1056 					return err;
1057 			}
1058 			view_border(view);
1059 			update_panels();
1060 			doupdate();
1061 			show_panel(view->child->panel);
1062 			nlines = view->nlines;
1063 		}
1064 	} else if (view->parent == NULL)
1065 		ncols = COLS;
1066 
1067 	if (view->resize && dif > 0) {
1068 		err = view->resize(view, dif);
1069 		if (err)
1070 			return err;
1071 	}
1072 
1073 	if (wresize(view->window, nlines, ncols) == ERR)
1074 		return got_error_from_errno("wresize");
1075 	if (replace_panel(view->panel, view->window) == ERR)
1076 		return got_error_from_errno("replace_panel");
1077 	wclear(view->window);
1078 
1079 	view->nlines = nlines;
1080 	view->ncols = ncols;
1081 	view->lines = LINES;
1082 	view->cols = COLS;
1083 
1084 	return NULL;
1085 }
1086 
1087 static const struct got_error *
1088 resize_log_view(struct tog_view *view, int increase)
1089 {
1090 	struct tog_log_view_state	*s = &view->state.log;
1091 	const struct got_error		*err = NULL;
1092 	int				 n = 0;
1093 
1094 	if (s->selected_entry)
1095 		n = s->selected_entry->idx + view->lines - s->selected;
1096 
1097 	/*
1098 	 * Request commits to account for the increased
1099 	 * height so we have enough to populate the view.
1100 	 */
1101 	if (s->commits->ncommits < n) {
1102 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1103 		err = request_log_commits(view);
1104 	}
1105 
1106 	return err;
1107 }
1108 
1109 static void
1110 view_adjust_offset(struct tog_view *view, int n)
1111 {
1112 	if (n == 0)
1113 		return;
1114 
1115 	if (view->parent && view->parent->offset) {
1116 		if (view->parent->offset + n >= 0)
1117 			view->parent->offset += n;
1118 		else
1119 			view->parent->offset = 0;
1120 	} else if (view->offset) {
1121 		if (view->offset - n >= 0)
1122 			view->offset -= n;
1123 		else
1124 			view->offset = 0;
1125 	}
1126 }
1127 
1128 static const struct got_error *
1129 view_resize_split(struct tog_view *view, int resize)
1130 {
1131 	const struct got_error	*err = NULL;
1132 	struct tog_view		*v = NULL;
1133 
1134 	if (view->parent)
1135 		v = view->parent;
1136 	else
1137 		v = view;
1138 
1139 	if (!v->child || !view_is_splitscreen(v->child))
1140 		return NULL;
1141 
1142 	v->resized = v->child->resized = resize;  /* lock for resize event */
1143 
1144 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1145 		if (v->child->resized_y)
1146 			v->child->begin_y = v->child->resized_y;
1147 		if (view->parent)
1148 			v->child->begin_y -= resize;
1149 		else
1150 			v->child->begin_y += resize;
1151 		if (v->child->begin_y < 3) {
1152 			view->count = 0;
1153 			v->child->begin_y = 3;
1154 		} else if (v->child->begin_y > LINES - 1) {
1155 			view->count = 0;
1156 			v->child->begin_y = LINES - 1;
1157 		}
1158 		v->ncols = COLS;
1159 		v->child->ncols = COLS;
1160 		view_adjust_offset(view, resize);
1161 		err = view_init_hsplit(v, v->child->begin_y);
1162 		if (err)
1163 			return err;
1164 		v->child->resized_y = v->child->begin_y;
1165 	} else {
1166 		if (v->child->resized_x)
1167 			v->child->begin_x = v->child->resized_x;
1168 		if (view->parent)
1169 			v->child->begin_x -= resize;
1170 		else
1171 			v->child->begin_x += resize;
1172 		if (v->child->begin_x < 11) {
1173 			view->count = 0;
1174 			v->child->begin_x = 11;
1175 		} else if (v->child->begin_x > COLS - 1) {
1176 			view->count = 0;
1177 			v->child->begin_x = COLS - 1;
1178 		}
1179 		v->child->resized_x = v->child->begin_x;
1180 	}
1181 
1182 	v->child->mode = v->mode;
1183 	v->child->nlines = v->lines - v->child->begin_y;
1184 	v->child->ncols = v->cols - v->child->begin_x;
1185 	v->focus_child = 1;
1186 
1187 	err = view_fullscreen(v);
1188 	if (err)
1189 		return err;
1190 	err = view_splitscreen(v->child);
1191 	if (err)
1192 		return err;
1193 
1194 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1195 		err = offset_selection_down(v->child);
1196 		if (err)
1197 			return err;
1198 	}
1199 
1200 	if (v->resize)
1201 		err = v->resize(v, 0);
1202 	else if (v->child->resize)
1203 		err = v->child->resize(v->child, 0);
1204 
1205 	v->resized = v->child->resized = 0;
1206 
1207 	return err;
1208 }
1209 
1210 static void
1211 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1212 {
1213 	struct tog_view *v = src->child ? src->child : src;
1214 
1215 	dst->resized_x = v->resized_x;
1216 	dst->resized_y = v->resized_y;
1217 }
1218 
1219 static const struct got_error *
1220 view_close_child(struct tog_view *view)
1221 {
1222 	const struct got_error *err = NULL;
1223 
1224 	if (view->child == NULL)
1225 		return NULL;
1226 
1227 	err = view_close(view->child);
1228 	view->child = NULL;
1229 	return err;
1230 }
1231 
1232 static const struct got_error *
1233 view_set_child(struct tog_view *view, struct tog_view *child)
1234 {
1235 	const struct got_error *err = NULL;
1236 
1237 	view->child = child;
1238 	child->parent = view;
1239 
1240 	err = view_resize(view);
1241 	if (err)
1242 		return err;
1243 
1244 	if (view->child->resized_x || view->child->resized_y)
1245 		err = view_resize_split(view, 0);
1246 
1247 	return err;
1248 }
1249 
1250 static const struct got_error *view_dispatch_request(struct tog_view **,
1251     struct tog_view *, enum tog_view_type, int, int);
1252 
1253 static const struct got_error *
1254 view_request_new(struct tog_view **requested, struct tog_view *view,
1255     enum tog_view_type request)
1256 {
1257 	struct tog_view		*new_view = NULL;
1258 	const struct got_error	*err;
1259 	int			 y = 0, x = 0;
1260 
1261 	*requested = NULL;
1262 
1263 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1264 		view_get_split(view, &y, &x);
1265 
1266 	err = view_dispatch_request(&new_view, view, request, y, x);
1267 	if (err)
1268 		return err;
1269 
1270 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1271 	    request != TOG_VIEW_HELP) {
1272 		err = view_init_hsplit(view, y);
1273 		if (err)
1274 			return err;
1275 	}
1276 
1277 	view->focussed = 0;
1278 	new_view->focussed = 1;
1279 	new_view->mode = view->mode;
1280 	new_view->nlines = request == TOG_VIEW_HELP ?
1281 	    view->lines : view->lines - y;
1282 
1283 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1284 		view_transfer_size(new_view, view);
1285 		err = view_close_child(view);
1286 		if (err)
1287 			return err;
1288 		err = view_set_child(view, new_view);
1289 		if (err)
1290 			return err;
1291 		view->focus_child = 1;
1292 	} else
1293 		*requested = new_view;
1294 
1295 	return NULL;
1296 }
1297 
1298 static void
1299 tog_resizeterm(void)
1300 {
1301 	int cols, lines;
1302 	struct winsize size;
1303 
1304 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1305 		cols = 80;     /* Default */
1306 		lines = 24;
1307 	} else {
1308 		cols = size.ws_col;
1309 		lines = size.ws_row;
1310 	}
1311 	resize_term(lines, cols);
1312 }
1313 
1314 static const struct got_error *
1315 view_search_start(struct tog_view *view, int fast_refresh)
1316 {
1317 	const struct got_error *err = NULL;
1318 	struct tog_view *v = view;
1319 	char pattern[1024];
1320 	int ret;
1321 
1322 	if (view->search_started) {
1323 		regfree(&view->regex);
1324 		view->searching = 0;
1325 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1326 	}
1327 	view->search_started = 0;
1328 
1329 	if (view->nlines < 1)
1330 		return NULL;
1331 
1332 	if (view_is_hsplit_top(view))
1333 		v = view->child;
1334 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1335 		v = view->parent;
1336 
1337 	if (tog_io.input_str != NULL) {
1338 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
1339 		    sizeof(pattern))
1340 			return got_error(GOT_ERR_NO_SPACE);
1341 	} else {
1342 		mvwaddstr(v->window, v->nlines - 1, 0, "/");
1343 		wclrtoeol(v->window);
1344 		nodelay(v->window, FALSE);  /* block for search term input */
1345 		nocbreak();
1346 		echo();
1347 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
1348 		wrefresh(v->window);
1349 		cbreak();
1350 		noecho();
1351 		nodelay(v->window, TRUE);
1352 		if (!fast_refresh && !using_mock_io)
1353 			halfdelay(10);
1354 		if (ret == ERR)
1355 			return NULL;
1356 	}
1357 
1358 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1359 		err = view->search_start(view);
1360 		if (err) {
1361 			regfree(&view->regex);
1362 			return err;
1363 		}
1364 		view->search_started = 1;
1365 		view->searching = TOG_SEARCH_FORWARD;
1366 		view->search_next_done = 0;
1367 		view->search_next(view);
1368 	}
1369 
1370 	return NULL;
1371 }
1372 
1373 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1374 static const struct got_error *
1375 switch_split(struct tog_view *view)
1376 {
1377 	const struct got_error	*err = NULL;
1378 	struct tog_view		*v = NULL;
1379 
1380 	if (view->parent)
1381 		v = view->parent;
1382 	else
1383 		v = view;
1384 
1385 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1386 		v->mode = TOG_VIEW_SPLIT_VERT;
1387 	else
1388 		v->mode = TOG_VIEW_SPLIT_HRZN;
1389 
1390 	if (!v->child)
1391 		return NULL;
1392 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1393 		v->mode = TOG_VIEW_SPLIT_NONE;
1394 
1395 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1396 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1397 		v->child->begin_y = v->child->resized_y;
1398 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1399 		v->child->begin_x = v->child->resized_x;
1400 
1401 
1402 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1403 		v->ncols = COLS;
1404 		v->child->ncols = COLS;
1405 		v->child->nscrolled = LINES - v->child->nlines;
1406 
1407 		err = view_init_hsplit(v, v->child->begin_y);
1408 		if (err)
1409 			return err;
1410 	}
1411 	v->child->mode = v->mode;
1412 	v->child->nlines = v->lines - v->child->begin_y;
1413 	v->focus_child = 1;
1414 
1415 	err = view_fullscreen(v);
1416 	if (err)
1417 		return err;
1418 	err = view_splitscreen(v->child);
1419 	if (err)
1420 		return err;
1421 
1422 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1423 		v->mode = TOG_VIEW_SPLIT_VERT;
1424 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1425 		err = offset_selection_down(v);
1426 		if (err)
1427 			return err;
1428 		err = offset_selection_down(v->child);
1429 		if (err)
1430 			return err;
1431 	} else {
1432 		offset_selection_up(v);
1433 		offset_selection_up(v->child);
1434 	}
1435 	if (v->resize)
1436 		err = v->resize(v, 0);
1437 	else if (v->child->resize)
1438 		err = v->child->resize(v->child, 0);
1439 
1440 	return err;
1441 }
1442 
1443 /*
1444  * Strip trailing whitespace from str starting at byte *n;
1445  * if *n < 0, use strlen(str). Return new str length in *n.
1446  */
1447 static void
1448 strip_trailing_ws(char *str, int *n)
1449 {
1450 	size_t x = *n;
1451 
1452 	if (str == NULL || *str == '\0')
1453 		return;
1454 
1455 	if (x < 0)
1456 		x = strlen(str);
1457 
1458 	while (x-- > 0 && isspace((unsigned char)str[x]))
1459 		str[x] = '\0';
1460 
1461 	*n = x + 1;
1462 }
1463 
1464 /*
1465  * Extract visible substring of line y from the curses screen
1466  * and strip trailing whitespace. If vline is set, overwrite
1467  * line[vline] with '|' because the ACS_VLINE character is
1468  * written out as 'x'. Write the line to file f.
1469  */
1470 static const struct got_error *
1471 view_write_line(FILE *f, int y, int vline)
1472 {
1473 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1474 	int	r, w;
1475 
1476 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1477 	if (r == ERR)
1478 		return got_error_fmt(GOT_ERR_RANGE,
1479 		    "failed to extract line %d", y);
1480 
1481 	/*
1482 	 * In some views, lines are padded with blanks to COLS width.
1483 	 * Strip them so we can diff without the -b flag when testing.
1484 	 */
1485 	strip_trailing_ws(line, &r);
1486 
1487 	if (vline > 0)
1488 		line[vline] = '|';
1489 
1490 	w = fprintf(f, "%s\n", line);
1491 	if (w != r + 1)		/* \n */
1492 		return got_ferror(f, GOT_ERR_IO);
1493 
1494 	return NULL;
1495 }
1496 
1497 /*
1498  * Capture the visible curses screen by writing each line to the
1499  * file at the path set via the TOG_SCR_DUMP environment variable.
1500  */
1501 static const struct got_error *
1502 screendump(struct tog_view *view)
1503 {
1504 	const struct got_error	*err;
1505 	int			 i;
1506 
1507 	err = got_opentemp_truncate(tog_io.sdump);
1508 	if (err)
1509 		return err;
1510 
1511 	if ((view->child && view->child->begin_x) ||
1512 	    (view->parent && view->begin_x)) {
1513 		int ncols = view->child ? view->ncols : view->parent->ncols;
1514 
1515 		/* vertical splitscreen */
1516 		for (i = 0; i < view->nlines; ++i) {
1517 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1518 			if (err)
1519 				goto done;
1520 		}
1521 	} else {
1522 		int hline = 0;
1523 
1524 		/* fullscreen or horizontal splitscreen */
1525 		if ((view->child && view->child->begin_y) ||
1526 		    (view->parent && view->begin_y))	/* hsplit */
1527 			hline = view->child ?
1528 			    view->child->begin_y : view->begin_y;
1529 
1530 		for (i = 0; i < view->lines; i++) {
1531 			if (hline && i == hline - 1) {
1532 				int c;
1533 
1534 				/* ACS_HLINE writes out as 'q', overwrite it */
1535 				for (c = 0; c < view->cols; ++c)
1536 					fputc('-', tog_io.sdump);
1537 				fputc('\n', tog_io.sdump);
1538 				continue;
1539 			}
1540 
1541 			err = view_write_line(tog_io.sdump, i, 0);
1542 			if (err)
1543 				goto done;
1544 		}
1545 	}
1546 
1547 done:
1548 	return err;
1549 }
1550 
1551 /*
1552  * Compute view->count from numeric input. Assign total to view->count and
1553  * return first non-numeric key entered.
1554  */
1555 static int
1556 get_compound_key(struct tog_view *view, int c)
1557 {
1558 	struct tog_view	*v = view;
1559 	int		 x, n = 0;
1560 
1561 	if (view_is_hsplit_top(view))
1562 		v = view->child;
1563 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1564 		v = view->parent;
1565 
1566 	view->count = 0;
1567 	cbreak();  /* block for input */
1568 	nodelay(view->window, FALSE);
1569 	wmove(v->window, v->nlines - 1, 0);
1570 	wclrtoeol(v->window);
1571 	waddch(v->window, ':');
1572 
1573 	do {
1574 		x = getcurx(v->window);
1575 		if (x != ERR && x < view->ncols) {
1576 			waddch(v->window, c);
1577 			wrefresh(v->window);
1578 		}
1579 
1580 		/*
1581 		 * Don't overflow. Max valid request should be the greatest
1582 		 * between the longest and total lines; cap at 10 million.
1583 		 */
1584 		if (n >= 9999999)
1585 			n = 9999999;
1586 		else
1587 			n = n * 10 + (c - '0');
1588 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1589 
1590 	if (c == 'G' || c == 'g') {	/* nG key map */
1591 		view->gline = view->hiline = n;
1592 		n = 0;
1593 		c = 0;
1594 	}
1595 
1596 	/* Massage excessive or inapplicable values at the input handler. */
1597 	view->count = n;
1598 
1599 	return c;
1600 }
1601 
1602 static void
1603 action_report(struct tog_view *view)
1604 {
1605 	struct tog_view *v = view;
1606 
1607 	if (view_is_hsplit_top(view))
1608 		v = view->child;
1609 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1610 		v = view->parent;
1611 
1612 	wmove(v->window, v->nlines - 1, 0);
1613 	wclrtoeol(v->window);
1614 	wprintw(v->window, ":%s", view->action);
1615 	wrefresh(v->window);
1616 
1617 	/*
1618 	 * Clear action status report. Only clear in blame view
1619 	 * once annotating is complete, otherwise it's too fast.
1620 	 */
1621 	if (view->type == TOG_VIEW_BLAME) {
1622 		if (view->state.blame.blame_complete)
1623 			view->action = NULL;
1624 	} else
1625 		view->action = NULL;
1626 }
1627 
1628 /*
1629  * Read the next line from the test script and assign
1630  * key instruction to *ch. If at EOF, set the *done flag.
1631  */
1632 static const struct got_error *
1633 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1634 {
1635 	const struct got_error	*err = NULL;
1636 	char			*line = NULL;
1637 	size_t			 linesz = 0;
1638 	ssize_t			 n;
1639 
1640 
1641 	if (view->count && --view->count) {
1642 		*ch = view->ch;
1643 		return NULL;
1644 	} else
1645 		*ch = -1;
1646 
1647 	if ((n = getline(&line, &linesz, script)) == -1) {
1648 		if (feof(script)) {
1649 			*done = 1;
1650 			goto done;
1651 		} else {
1652 			err = got_ferror(script, GOT_ERR_IO);
1653 			goto done;
1654 		}
1655 	}
1656 
1657 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1658 		tog_io.wait_for_ui = 1;
1659 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1660 		*ch = KEY_ENTER;
1661 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1662 		*ch = KEY_RIGHT;
1663 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1664 		*ch = KEY_LEFT;
1665 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1666 		*ch = KEY_DOWN;
1667 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1668 		*ch = KEY_UP;
1669 	else if (strncasecmp(line, "TAB", 3) == 0)
1670 		*ch = '\t';
1671 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1672 		*ch = TOG_KEY_SCRDUMP;
1673 	else if (isdigit((unsigned char)*line)) {
1674 		char *t = line;
1675 
1676 		while (isdigit((unsigned char)*t))
1677 			++t;
1678 		view->ch = *ch = *t;
1679 		*t = '\0';
1680 		/* ignore error, view->count is 0 if instruction is invalid */
1681 		view->count = strtonum(line, 0, INT_MAX, NULL);
1682 	} else {
1683 		*ch = *line;
1684 		if (n > 2 && (*ch == '/' || *ch == '&')) {
1685 			/* skip leading keymap and trim trailing newline */
1686 			tog_io.input_str = strndup(line + 1, n - 2);
1687 			if (tog_io.input_str == NULL) {
1688 				err = got_error_from_errno("strndup");
1689 				goto done;
1690 			}
1691 		}
1692 	}
1693 
1694 done:
1695 	free(line);
1696 	return err;
1697 }
1698 
1699 static const struct got_error *
1700 view_input(struct tog_view **new, int *done, struct tog_view *view,
1701     struct tog_view_list_head *views, int fast_refresh)
1702 {
1703 	const struct got_error *err = NULL;
1704 	struct tog_view *v;
1705 	int ch, errcode;
1706 
1707 	*new = NULL;
1708 
1709 	if (view->action)
1710 		action_report(view);
1711 
1712 	/* Clear "no matches" indicator. */
1713 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1714 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1715 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1716 		view->count = 0;
1717 	}
1718 
1719 	if (view->searching && !view->search_next_done) {
1720 		errcode = pthread_mutex_unlock(&tog_mutex);
1721 		if (errcode)
1722 			return got_error_set_errno(errcode,
1723 			    "pthread_mutex_unlock");
1724 		sched_yield();
1725 		errcode = pthread_mutex_lock(&tog_mutex);
1726 		if (errcode)
1727 			return got_error_set_errno(errcode,
1728 			    "pthread_mutex_lock");
1729 		view->search_next(view);
1730 		return NULL;
1731 	}
1732 
1733 	/* Allow threads to make progress while we are waiting for input. */
1734 	errcode = pthread_mutex_unlock(&tog_mutex);
1735 	if (errcode)
1736 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1737 
1738 	if (using_mock_io) {
1739 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1740 		if (err) {
1741 			errcode = pthread_mutex_lock(&tog_mutex);
1742 			return err;
1743 		}
1744 	} else if (view->count && --view->count) {
1745 		cbreak();
1746 		nodelay(view->window, TRUE);
1747 		ch = wgetch(view->window);
1748 		/* let C-g or backspace abort unfinished count */
1749 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1750 			view->count = 0;
1751 		else
1752 			ch = view->ch;
1753 	} else {
1754 		ch = wgetch(view->window);
1755 		if (ch >= '1' && ch  <= '9')
1756 			view->ch = ch = get_compound_key(view, ch);
1757 	}
1758 	if (view->hiline && ch != ERR && ch != 0)
1759 		view->hiline = 0;  /* key pressed, clear line highlight */
1760 	nodelay(view->window, TRUE);
1761 	errcode = pthread_mutex_lock(&tog_mutex);
1762 	if (errcode)
1763 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1764 
1765 	if (tog_sigwinch_received || tog_sigcont_received) {
1766 		tog_resizeterm();
1767 		tog_sigwinch_received = 0;
1768 		tog_sigcont_received = 0;
1769 		TAILQ_FOREACH(v, views, entry) {
1770 			err = view_resize(v);
1771 			if (err)
1772 				return err;
1773 			err = v->input(new, v, KEY_RESIZE);
1774 			if (err)
1775 				return err;
1776 			if (v->child) {
1777 				err = view_resize(v->child);
1778 				if (err)
1779 					return err;
1780 				err = v->child->input(new, v->child,
1781 				    KEY_RESIZE);
1782 				if (err)
1783 					return err;
1784 				if (v->child->resized_x || v->child->resized_y) {
1785 					err = view_resize_split(v, 0);
1786 					if (err)
1787 						return err;
1788 				}
1789 			}
1790 		}
1791 	}
1792 
1793 	switch (ch) {
1794 	case '?':
1795 	case 'H':
1796 	case KEY_F(1):
1797 		if (view->type == TOG_VIEW_HELP)
1798 			err = view->reset(view);
1799 		else
1800 			err = view_request_new(new, view, TOG_VIEW_HELP);
1801 		break;
1802 	case '\t':
1803 		view->count = 0;
1804 		if (view->child) {
1805 			view->focussed = 0;
1806 			view->child->focussed = 1;
1807 			view->focus_child = 1;
1808 		} else if (view->parent) {
1809 			view->focussed = 0;
1810 			view->parent->focussed = 1;
1811 			view->parent->focus_child = 0;
1812 			if (!view_is_splitscreen(view)) {
1813 				if (view->parent->resize) {
1814 					err = view->parent->resize(view->parent,
1815 					    0);
1816 					if (err)
1817 						return err;
1818 				}
1819 				offset_selection_up(view->parent);
1820 				err = view_fullscreen(view->parent);
1821 				if (err)
1822 					return err;
1823 			}
1824 		}
1825 		break;
1826 	case 'q':
1827 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1828 			if (view->parent->resize) {
1829 				/* might need more commits to fill fullscreen */
1830 				err = view->parent->resize(view->parent, 0);
1831 				if (err)
1832 					break;
1833 			}
1834 			offset_selection_up(view->parent);
1835 		}
1836 		err = view->input(new, view, ch);
1837 		view->dying = 1;
1838 		break;
1839 	case 'Q':
1840 		*done = 1;
1841 		break;
1842 	case 'F':
1843 		view->count = 0;
1844 		if (view_is_parent_view(view)) {
1845 			if (view->child == NULL)
1846 				break;
1847 			if (view_is_splitscreen(view->child)) {
1848 				view->focussed = 0;
1849 				view->child->focussed = 1;
1850 				err = view_fullscreen(view->child);
1851 			} else {
1852 				err = view_splitscreen(view->child);
1853 				if (!err)
1854 					err = view_resize_split(view, 0);
1855 			}
1856 			if (err)
1857 				break;
1858 			err = view->child->input(new, view->child,
1859 			    KEY_RESIZE);
1860 		} else {
1861 			if (view_is_splitscreen(view)) {
1862 				view->parent->focussed = 0;
1863 				view->focussed = 1;
1864 				err = view_fullscreen(view);
1865 			} else {
1866 				err = view_splitscreen(view);
1867 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1868 					err = view_resize(view->parent);
1869 				if (!err)
1870 					err = view_resize_split(view, 0);
1871 			}
1872 			if (err)
1873 				break;
1874 			err = view->input(new, view, KEY_RESIZE);
1875 		}
1876 		if (err)
1877 			break;
1878 		if (view->resize) {
1879 			err = view->resize(view, 0);
1880 			if (err)
1881 				break;
1882 		}
1883 		if (view->parent) {
1884 			if (view->parent->resize) {
1885 				err = view->parent->resize(view->parent, 0);
1886 				if (err != NULL)
1887 					break;
1888 			}
1889 			err = offset_selection_down(view->parent);
1890 			if (err != NULL)
1891 				break;
1892 		}
1893 		err = offset_selection_down(view);
1894 		break;
1895 	case 'S':
1896 		view->count = 0;
1897 		err = switch_split(view);
1898 		break;
1899 	case '-':
1900 		err = view_resize_split(view, -1);
1901 		break;
1902 	case '+':
1903 		err = view_resize_split(view, 1);
1904 		break;
1905 	case KEY_RESIZE:
1906 		break;
1907 	case '/':
1908 		view->count = 0;
1909 		if (view->search_start)
1910 			view_search_start(view, fast_refresh);
1911 		else
1912 			err = view->input(new, view, ch);
1913 		break;
1914 	case 'N':
1915 	case 'n':
1916 		if (view->search_started && view->search_next) {
1917 			view->searching = (ch == 'n' ?
1918 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1919 			view->search_next_done = 0;
1920 			view->search_next(view);
1921 		} else
1922 			err = view->input(new, view, ch);
1923 		break;
1924 	case 'A':
1925 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1926 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1927 			view->action = "Patience diff algorithm";
1928 		} else {
1929 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1930 			view->action = "Myers diff algorithm";
1931 		}
1932 		TAILQ_FOREACH(v, views, entry) {
1933 			if (v->reset) {
1934 				err = v->reset(v);
1935 				if (err)
1936 					return err;
1937 			}
1938 			if (v->child && v->child->reset) {
1939 				err = v->child->reset(v->child);
1940 				if (err)
1941 					return err;
1942 			}
1943 		}
1944 		break;
1945 	case TOG_KEY_SCRDUMP:
1946 		err = screendump(view);
1947 		break;
1948 	default:
1949 		err = view->input(new, view, ch);
1950 		break;
1951 	}
1952 
1953 	return err;
1954 }
1955 
1956 static int
1957 view_needs_focus_indication(struct tog_view *view)
1958 {
1959 	if (view_is_parent_view(view)) {
1960 		if (view->child == NULL || view->child->focussed)
1961 			return 0;
1962 		if (!view_is_splitscreen(view->child))
1963 			return 0;
1964 	} else if (!view_is_splitscreen(view))
1965 		return 0;
1966 
1967 	return view->focussed;
1968 }
1969 
1970 static const struct got_error *
1971 tog_io_close(void)
1972 {
1973 	const struct got_error *err = NULL;
1974 
1975 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1976 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1977 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1978 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1979 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1980 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1981 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1982 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1983 	if (tog_io.input_str != NULL)
1984 		free(tog_io.input_str);
1985 
1986 	return err;
1987 }
1988 
1989 static const struct got_error *
1990 view_loop(struct tog_view *view)
1991 {
1992 	const struct got_error *err = NULL;
1993 	struct tog_view_list_head views;
1994 	struct tog_view *new_view;
1995 	char *mode;
1996 	int fast_refresh = 10;
1997 	int done = 0, errcode;
1998 
1999 	mode = getenv("TOG_VIEW_SPLIT_MODE");
2000 	if (!mode || !(*mode == 'h' || *mode == 'H'))
2001 		view->mode = TOG_VIEW_SPLIT_VERT;
2002 	else
2003 		view->mode = TOG_VIEW_SPLIT_HRZN;
2004 
2005 	errcode = pthread_mutex_lock(&tog_mutex);
2006 	if (errcode)
2007 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2008 
2009 	TAILQ_INIT(&views);
2010 	TAILQ_INSERT_HEAD(&views, view, entry);
2011 
2012 	view->focussed = 1;
2013 	err = view->show(view);
2014 	if (err)
2015 		return err;
2016 	update_panels();
2017 	doupdate();
2018 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2019 	    !tog_fatal_signal_received()) {
2020 		/* Refresh fast during initialization, then become slower. */
2021 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2022 			halfdelay(10); /* switch to once per second */
2023 
2024 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2025 		if (err)
2026 			break;
2027 
2028 		if (view->dying && view == TAILQ_FIRST(&views) &&
2029 		    TAILQ_NEXT(view, entry) == NULL)
2030 			done = 1;
2031 		if (done) {
2032 			struct tog_view *v;
2033 
2034 			/*
2035 			 * When we quit, scroll the screen up a single line
2036 			 * so we don't lose any information.
2037 			 */
2038 			TAILQ_FOREACH(v, &views, entry) {
2039 				wmove(v->window, 0, 0);
2040 				wdeleteln(v->window);
2041 				wnoutrefresh(v->window);
2042 				if (v->child && !view_is_fullscreen(v)) {
2043 					wmove(v->child->window, 0, 0);
2044 					wdeleteln(v->child->window);
2045 					wnoutrefresh(v->child->window);
2046 				}
2047 			}
2048 			doupdate();
2049 		}
2050 
2051 		if (view->dying) {
2052 			struct tog_view *v, *prev = NULL;
2053 
2054 			if (view_is_parent_view(view))
2055 				prev = TAILQ_PREV(view, tog_view_list_head,
2056 				    entry);
2057 			else if (view->parent)
2058 				prev = view->parent;
2059 
2060 			if (view->parent) {
2061 				view->parent->child = NULL;
2062 				view->parent->focus_child = 0;
2063 				/* Restore fullscreen line height. */
2064 				view->parent->nlines = view->parent->lines;
2065 				err = view_resize(view->parent);
2066 				if (err)
2067 					break;
2068 				/* Make resized splits persist. */
2069 				view_transfer_size(view->parent, view);
2070 			} else
2071 				TAILQ_REMOVE(&views, view, entry);
2072 
2073 			err = view_close(view);
2074 			if (err)
2075 				goto done;
2076 
2077 			view = NULL;
2078 			TAILQ_FOREACH(v, &views, entry) {
2079 				if (v->focussed)
2080 					break;
2081 			}
2082 			if (view == NULL && new_view == NULL) {
2083 				/* No view has focus. Try to pick one. */
2084 				if (prev)
2085 					view = prev;
2086 				else if (!TAILQ_EMPTY(&views)) {
2087 					view = TAILQ_LAST(&views,
2088 					    tog_view_list_head);
2089 				}
2090 				if (view) {
2091 					if (view->focus_child) {
2092 						view->child->focussed = 1;
2093 						view = view->child;
2094 					} else
2095 						view->focussed = 1;
2096 				}
2097 			}
2098 		}
2099 		if (new_view) {
2100 			struct tog_view *v, *t;
2101 			/* Only allow one parent view per type. */
2102 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2103 				if (v->type != new_view->type)
2104 					continue;
2105 				TAILQ_REMOVE(&views, v, entry);
2106 				err = view_close(v);
2107 				if (err)
2108 					goto done;
2109 				break;
2110 			}
2111 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2112 			view = new_view;
2113 		}
2114 		if (view && !done) {
2115 			if (view_is_parent_view(view)) {
2116 				if (view->child && view->child->focussed)
2117 					view = view->child;
2118 			} else {
2119 				if (view->parent && view->parent->focussed)
2120 					view = view->parent;
2121 			}
2122 			show_panel(view->panel);
2123 			if (view->child && view_is_splitscreen(view->child))
2124 				show_panel(view->child->panel);
2125 			if (view->parent && view_is_splitscreen(view)) {
2126 				err = view->parent->show(view->parent);
2127 				if (err)
2128 					goto done;
2129 			}
2130 			err = view->show(view);
2131 			if (err)
2132 				goto done;
2133 			if (view->child) {
2134 				err = view->child->show(view->child);
2135 				if (err)
2136 					goto done;
2137 			}
2138 			update_panels();
2139 			doupdate();
2140 		}
2141 	}
2142 done:
2143 	while (!TAILQ_EMPTY(&views)) {
2144 		const struct got_error *close_err;
2145 		view = TAILQ_FIRST(&views);
2146 		TAILQ_REMOVE(&views, view, entry);
2147 		close_err = view_close(view);
2148 		if (close_err && err == NULL)
2149 			err = close_err;
2150 	}
2151 
2152 	errcode = pthread_mutex_unlock(&tog_mutex);
2153 	if (errcode && err == NULL)
2154 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2155 
2156 	return err;
2157 }
2158 
2159 __dead static void
2160 usage_log(void)
2161 {
2162 	endwin();
2163 	fprintf(stderr,
2164 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2165 	    getprogname());
2166 	exit(1);
2167 }
2168 
2169 /* Create newly allocated wide-character string equivalent to a byte string. */
2170 static const struct got_error *
2171 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2172 {
2173 	char *vis = NULL;
2174 	const struct got_error *err = NULL;
2175 
2176 	*ws = NULL;
2177 	*wlen = mbstowcs(NULL, s, 0);
2178 	if (*wlen == (size_t)-1) {
2179 		int vislen;
2180 		if (errno != EILSEQ)
2181 			return got_error_from_errno("mbstowcs");
2182 
2183 		/* byte string invalid in current encoding; try to "fix" it */
2184 		err = got_mbsavis(&vis, &vislen, s);
2185 		if (err)
2186 			return err;
2187 		*wlen = mbstowcs(NULL, vis, 0);
2188 		if (*wlen == (size_t)-1) {
2189 			err = got_error_from_errno("mbstowcs"); /* give up */
2190 			goto done;
2191 		}
2192 	}
2193 
2194 	*ws = calloc(*wlen + 1, sizeof(**ws));
2195 	if (*ws == NULL) {
2196 		err = got_error_from_errno("calloc");
2197 		goto done;
2198 	}
2199 
2200 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2201 		err = got_error_from_errno("mbstowcs");
2202 done:
2203 	free(vis);
2204 	if (err) {
2205 		free(*ws);
2206 		*ws = NULL;
2207 		*wlen = 0;
2208 	}
2209 	return err;
2210 }
2211 
2212 static const struct got_error *
2213 expand_tab(char **ptr, const char *src)
2214 {
2215 	char	*dst;
2216 	size_t	 len, n, idx = 0, sz = 0;
2217 
2218 	*ptr = NULL;
2219 	n = len = strlen(src);
2220 	dst = malloc(n + 1);
2221 	if (dst == NULL)
2222 		return got_error_from_errno("malloc");
2223 
2224 	while (idx < len && src[idx]) {
2225 		const char c = src[idx];
2226 
2227 		if (c == '\t') {
2228 			size_t nb = TABSIZE - sz % TABSIZE;
2229 			char *p;
2230 
2231 			p = realloc(dst, n + nb);
2232 			if (p == NULL) {
2233 				free(dst);
2234 				return got_error_from_errno("realloc");
2235 
2236 			}
2237 			dst = p;
2238 			n += nb;
2239 			memset(dst + sz, ' ', nb);
2240 			sz += nb;
2241 		} else
2242 			dst[sz++] = src[idx];
2243 		++idx;
2244 	}
2245 
2246 	dst[sz] = '\0';
2247 	*ptr = dst;
2248 	return NULL;
2249 }
2250 
2251 /*
2252  * Advance at most n columns from wline starting at offset off.
2253  * Return the index to the first character after the span operation.
2254  * Return the combined column width of all spanned wide characters in
2255  * *rcol.
2256  */
2257 static int
2258 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2259 {
2260 	int width, i, cols = 0;
2261 
2262 	if (n == 0) {
2263 		*rcol = cols;
2264 		return off;
2265 	}
2266 
2267 	for (i = off; wline[i] != L'\0'; ++i) {
2268 		if (wline[i] == L'\t')
2269 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2270 		else
2271 			width = wcwidth(wline[i]);
2272 
2273 		if (width == -1) {
2274 			width = 1;
2275 			wline[i] = L'.';
2276 		}
2277 
2278 		if (cols + width > n)
2279 			break;
2280 		cols += width;
2281 	}
2282 
2283 	*rcol = cols;
2284 	return i;
2285 }
2286 
2287 /*
2288  * Format a line for display, ensuring that it won't overflow a width limit.
2289  * With scrolling, the width returned refers to the scrolled version of the
2290  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2291  */
2292 static const struct got_error *
2293 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2294     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2295 {
2296 	const struct got_error *err = NULL;
2297 	int cols;
2298 	wchar_t *wline = NULL;
2299 	char *exstr = NULL;
2300 	size_t wlen;
2301 	int i, scrollx;
2302 
2303 	*wlinep = NULL;
2304 	*widthp = 0;
2305 
2306 	if (expand) {
2307 		err = expand_tab(&exstr, line);
2308 		if (err)
2309 			return err;
2310 	}
2311 
2312 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2313 	free(exstr);
2314 	if (err)
2315 		return err;
2316 
2317 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2318 
2319 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2320 		wline[wlen - 1] = L'\0';
2321 		wlen--;
2322 	}
2323 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2324 		wline[wlen - 1] = L'\0';
2325 		wlen--;
2326 	}
2327 
2328 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2329 	wline[i] = L'\0';
2330 
2331 	if (widthp)
2332 		*widthp = cols;
2333 	if (scrollxp)
2334 		*scrollxp = scrollx;
2335 	if (err)
2336 		free(wline);
2337 	else
2338 		*wlinep = wline;
2339 	return err;
2340 }
2341 
2342 static const struct got_error*
2343 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2344     struct got_object_id *id, struct got_repository *repo)
2345 {
2346 	static const struct got_error *err = NULL;
2347 	struct got_reflist_entry *re;
2348 	char *s;
2349 	const char *name;
2350 
2351 	*refs_str = NULL;
2352 
2353 	if (refs == NULL)
2354 		return NULL;
2355 
2356 	TAILQ_FOREACH(re, refs, entry) {
2357 		struct got_tag_object *tag = NULL;
2358 		struct got_object_id *ref_id;
2359 		int cmp;
2360 
2361 		name = got_ref_get_name(re->ref);
2362 		if (strcmp(name, GOT_REF_HEAD) == 0)
2363 			continue;
2364 		if (strncmp(name, "refs/", 5) == 0)
2365 			name += 5;
2366 		if (strncmp(name, "got/", 4) == 0)
2367 			continue;
2368 		if (strncmp(name, "heads/", 6) == 0)
2369 			name += 6;
2370 		if (strncmp(name, "remotes/", 8) == 0) {
2371 			name += 8;
2372 			s = strstr(name, "/" GOT_REF_HEAD);
2373 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2374 				continue;
2375 		}
2376 		err = got_ref_resolve(&ref_id, repo, re->ref);
2377 		if (err)
2378 			break;
2379 		if (strncmp(name, "tags/", 5) == 0) {
2380 			err = got_object_open_as_tag(&tag, repo, ref_id);
2381 			if (err) {
2382 				if (err->code != GOT_ERR_OBJ_TYPE) {
2383 					free(ref_id);
2384 					break;
2385 				}
2386 				/* Ref points at something other than a tag. */
2387 				err = NULL;
2388 				tag = NULL;
2389 			}
2390 		}
2391 		cmp = got_object_id_cmp(tag ?
2392 		    got_object_tag_get_object_id(tag) : ref_id, id);
2393 		free(ref_id);
2394 		if (tag)
2395 			got_object_tag_close(tag);
2396 		if (cmp != 0)
2397 			continue;
2398 		s = *refs_str;
2399 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2400 		    s ? ", " : "", name) == -1) {
2401 			err = got_error_from_errno("asprintf");
2402 			free(s);
2403 			*refs_str = NULL;
2404 			break;
2405 		}
2406 		free(s);
2407 	}
2408 
2409 	return err;
2410 }
2411 
2412 static const struct got_error *
2413 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2414     int col_tab_align)
2415 {
2416 	char *smallerthan;
2417 
2418 	smallerthan = strchr(author, '<');
2419 	if (smallerthan && smallerthan[1] != '\0')
2420 		author = smallerthan + 1;
2421 	author[strcspn(author, "@>")] = '\0';
2422 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2423 	    col_tab_align, 0);
2424 }
2425 
2426 static const struct got_error *
2427 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2428     const size_t date_display_cols, int author_display_cols)
2429 {
2430 	struct tog_log_view_state *s = &view->state.log;
2431 	const struct got_error *err = NULL;
2432 	struct got_commit_object *commit = entry->commit;
2433 	struct got_object_id *id = entry->id;
2434 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2435 	char *refs_str = NULL;
2436 	char *logmsg0 = NULL, *logmsg = NULL;
2437 	char *author = NULL;
2438 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2439 	int author_width, refstr_width, logmsg_width;
2440 	char *newline, *line = NULL;
2441 	int col, limit, scrollx, logmsg_x;
2442 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2443 	struct tm tm;
2444 	time_t committer_time;
2445 	struct tog_color *tc;
2446 	struct got_reflist_head *refs;
2447 
2448 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2449 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2450 		tog_base_commit.idx = entry->idx;
2451 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2452 		int rc;
2453 
2454 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2455 		if (rc)
2456 			return got_error_set_errno(rc, "pthread_cond_wait");
2457 	}
2458 
2459 	committer_time = got_object_commit_get_committer_time(commit);
2460 	if (gmtime_r(&committer_time, &tm) == NULL)
2461 		return got_error_from_errno("gmtime_r");
2462 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2463 		return got_error(GOT_ERR_NO_SPACE);
2464 
2465 	if (avail <= date_display_cols)
2466 		limit = MIN(sizeof(datebuf) - 1, avail);
2467 	else
2468 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2469 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2470 	if (tc)
2471 		wattr_on(view->window,
2472 		    COLOR_PAIR(tc->colorpair), NULL);
2473 	waddnstr(view->window, datebuf, limit);
2474 	if (tc)
2475 		wattr_off(view->window,
2476 		    COLOR_PAIR(tc->colorpair), NULL);
2477 	col = limit;
2478 	if (col > avail)
2479 		goto done;
2480 
2481 	if (avail >= 120) {
2482 		char *id_str;
2483 		err = got_object_id_str(&id_str, id);
2484 		if (err)
2485 			goto done;
2486 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2487 		if (tc)
2488 			wattr_on(view->window,
2489 			    COLOR_PAIR(tc->colorpair), NULL);
2490 		wprintw(view->window, "%.8s ", id_str);
2491 		if (tc)
2492 			wattr_off(view->window,
2493 			    COLOR_PAIR(tc->colorpair), NULL);
2494 		free(id_str);
2495 		col += 9;
2496 		if (col > avail)
2497 			goto done;
2498 	}
2499 
2500 	if (s->use_committer)
2501 		author = strdup(got_object_commit_get_committer(commit));
2502 	else
2503 		author = strdup(got_object_commit_get_author(commit));
2504 	if (author == NULL) {
2505 		err = got_error_from_errno("strdup");
2506 		goto done;
2507 	}
2508 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2509 	if (err)
2510 		goto done;
2511 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2512 	if (tc)
2513 		wattr_on(view->window,
2514 		    COLOR_PAIR(tc->colorpair), NULL);
2515 	waddwstr(view->window, wauthor);
2516 	col += author_width;
2517 	while (col < avail && author_width < author_display_cols + 2) {
2518 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2519 		    author_width == marker_column &&
2520 		    entry->idx == tog_base_commit.idx && !s->limit_view) {
2521 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2522 			if (tc)
2523 				wattr_on(view->window,
2524 				    COLOR_PAIR(tc->colorpair), NULL);
2525 			waddch(view->window, tog_base_commit.marker);
2526 			if (tc)
2527 				wattr_off(view->window,
2528 				    COLOR_PAIR(tc->colorpair), NULL);
2529 		} else
2530 			waddch(view->window, ' ');
2531 		col++;
2532 		author_width++;
2533 	}
2534 	if (tc)
2535 		wattr_off(view->window,
2536 		    COLOR_PAIR(tc->colorpair), NULL);
2537 	if (col > avail)
2538 		goto done;
2539 
2540 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2541 	if (err)
2542 		goto done;
2543 	logmsg = logmsg0;
2544 	while (*logmsg == '\n')
2545 		logmsg++;
2546 	newline = strchr(logmsg, '\n');
2547 	if (newline)
2548 		*newline = '\0';
2549 
2550 	limit = avail - col;
2551 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2552 		limit--;	/* for the border */
2553 
2554 	/* Prepend reference labels to log message if possible .*/
2555 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2556 	err = build_refs_str(&refs_str, refs, id, s->repo);
2557 	if (err)
2558 		goto done;
2559 	if (refs_str) {
2560 		char *rs;
2561 
2562 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2563 			err = got_error_from_errno("asprintf");
2564 			goto done;
2565 		}
2566 		err = format_line(&wrefstr, &refstr_width,
2567 		    &scrollx, rs, view->x, limit, col, 1);
2568 		free(rs);
2569 		if (err)
2570 			goto done;
2571 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2572 		if (tc)
2573 			wattr_on(view->window,
2574 			    COLOR_PAIR(tc->colorpair), NULL);
2575 		waddwstr(view->window, &wrefstr[scrollx]);
2576 		if (tc)
2577 			wattr_off(view->window,
2578 			    COLOR_PAIR(tc->colorpair), NULL);
2579 		col += MAX(refstr_width, 0);
2580 		if (col > avail)
2581 			goto done;
2582 
2583 		if (col < avail) {
2584 			waddch(view->window, ' ');
2585 			col++;
2586 		}
2587 
2588 		if (refstr_width > 0)
2589 			logmsg_x = 0;
2590 		else {
2591 			int unscrolled_refstr_width;
2592 			size_t len = wcslen(wrefstr);
2593 
2594 			/*
2595 			 * No need to check for -1 return value here since
2596 			 * unprintables have been replaced by span_wline().
2597 			 */
2598 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2599 			unscrolled_refstr_width += 1; /* trailing space */
2600 			logmsg_x = view->x - unscrolled_refstr_width;
2601 		}
2602 
2603 		limit = avail - col;
2604 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2605 			limit--;	/* for the border */
2606 	} else
2607 		logmsg_x = view->x;
2608 
2609 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2610 	    limit, col, 1);
2611 	if (err)
2612 		goto done;
2613 	waddwstr(view->window, &wlogmsg[scrollx]);
2614 	col += MAX(logmsg_width, 0);
2615 	while (col < avail) {
2616 		waddch(view->window, ' ');
2617 		col++;
2618 	}
2619 done:
2620 	free(logmsg0);
2621 	free(wlogmsg);
2622 	free(wrefstr);
2623 	free(refs_str);
2624 	free(author);
2625 	free(wauthor);
2626 	free(line);
2627 	return err;
2628 }
2629 
2630 static struct commit_queue_entry *
2631 alloc_commit_queue_entry(struct got_commit_object *commit,
2632     struct got_object_id *id)
2633 {
2634 	struct commit_queue_entry *entry;
2635 	struct got_object_id *dup;
2636 
2637 	entry = calloc(1, sizeof(*entry));
2638 	if (entry == NULL)
2639 		return NULL;
2640 
2641 	dup = got_object_id_dup(id);
2642 	if (dup == NULL) {
2643 		free(entry);
2644 		return NULL;
2645 	}
2646 
2647 	entry->id = dup;
2648 	entry->commit = commit;
2649 	return entry;
2650 }
2651 
2652 static void
2653 pop_commit(struct commit_queue *commits)
2654 {
2655 	struct commit_queue_entry *entry;
2656 
2657 	entry = TAILQ_FIRST(&commits->head);
2658 	TAILQ_REMOVE(&commits->head, entry, entry);
2659 	got_object_commit_close(entry->commit);
2660 	commits->ncommits--;
2661 	free(entry->id);
2662 	free(entry);
2663 }
2664 
2665 static void
2666 free_commits(struct commit_queue *commits)
2667 {
2668 	while (!TAILQ_EMPTY(&commits->head))
2669 		pop_commit(commits);
2670 }
2671 
2672 static const struct got_error *
2673 match_commit(int *have_match, struct got_object_id *id,
2674     struct got_commit_object *commit, regex_t *regex)
2675 {
2676 	const struct got_error *err = NULL;
2677 	regmatch_t regmatch;
2678 	char *id_str = NULL, *logmsg = NULL;
2679 
2680 	*have_match = 0;
2681 
2682 	err = got_object_id_str(&id_str, id);
2683 	if (err)
2684 		return err;
2685 
2686 	err = got_object_commit_get_logmsg(&logmsg, commit);
2687 	if (err)
2688 		goto done;
2689 
2690 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2691 	    &regmatch, 0) == 0 ||
2692 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2693 	    &regmatch, 0) == 0 ||
2694 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2695 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2696 		*have_match = 1;
2697 done:
2698 	free(id_str);
2699 	free(logmsg);
2700 	return err;
2701 }
2702 
2703 static const struct got_error *
2704 queue_commits(struct tog_log_thread_args *a)
2705 {
2706 	const struct got_error *err = NULL;
2707 
2708 	/*
2709 	 * We keep all commits open throughout the lifetime of the log
2710 	 * view in order to avoid having to re-fetch commits from disk
2711 	 * while updating the display.
2712 	 */
2713 	do {
2714 		struct got_object_id id;
2715 		struct got_commit_object *commit;
2716 		struct commit_queue_entry *entry;
2717 		int limit_match = 0;
2718 		int errcode;
2719 
2720 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2721 		    NULL, NULL);
2722 		if (err)
2723 			break;
2724 
2725 		err = got_object_open_as_commit(&commit, a->repo, &id);
2726 		if (err)
2727 			break;
2728 		entry = alloc_commit_queue_entry(commit, &id);
2729 		if (entry == NULL) {
2730 			err = got_error_from_errno("alloc_commit_queue_entry");
2731 			break;
2732 		}
2733 
2734 		errcode = pthread_mutex_lock(&tog_mutex);
2735 		if (errcode) {
2736 			err = got_error_set_errno(errcode,
2737 			    "pthread_mutex_lock");
2738 			break;
2739 		}
2740 
2741 		entry->idx = a->real_commits->ncommits;
2742 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2743 		a->real_commits->ncommits++;
2744 
2745 		if (*a->limiting) {
2746 			err = match_commit(&limit_match, &id, commit,
2747 			    a->limit_regex);
2748 			if (err)
2749 				break;
2750 
2751 			if (limit_match) {
2752 				struct commit_queue_entry *matched;
2753 
2754 				matched = alloc_commit_queue_entry(
2755 				    entry->commit, entry->id);
2756 				if (matched == NULL) {
2757 					err = got_error_from_errno(
2758 					    "alloc_commit_queue_entry");
2759 					break;
2760 				}
2761 				matched->commit = entry->commit;
2762 				got_object_commit_retain(entry->commit);
2763 
2764 				matched->idx = a->limit_commits->ncommits;
2765 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2766 				    matched, entry);
2767 				a->limit_commits->ncommits++;
2768 			}
2769 
2770 			/*
2771 			 * This is how we signal log_thread() that we
2772 			 * have found a match, and that it should be
2773 			 * counted as a new entry for the view.
2774 			 */
2775 			a->limit_match = limit_match;
2776 		}
2777 
2778 		if (*a->searching == TOG_SEARCH_FORWARD &&
2779 		    !*a->search_next_done) {
2780 			int have_match;
2781 			err = match_commit(&have_match, &id, commit, a->regex);
2782 			if (err)
2783 				break;
2784 
2785 			if (*a->limiting) {
2786 				if (limit_match && have_match)
2787 					*a->search_next_done =
2788 					    TOG_SEARCH_HAVE_MORE;
2789 			} else if (have_match)
2790 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2791 		}
2792 
2793 		errcode = pthread_mutex_unlock(&tog_mutex);
2794 		if (errcode && err == NULL)
2795 			err = got_error_set_errno(errcode,
2796 			    "pthread_mutex_unlock");
2797 		if (err)
2798 			break;
2799 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2800 
2801 	return err;
2802 }
2803 
2804 static void
2805 select_commit(struct tog_log_view_state *s)
2806 {
2807 	struct commit_queue_entry *entry;
2808 	int ncommits = 0;
2809 
2810 	entry = s->first_displayed_entry;
2811 	while (entry) {
2812 		if (ncommits == s->selected) {
2813 			s->selected_entry = entry;
2814 			break;
2815 		}
2816 		entry = TAILQ_NEXT(entry, entry);
2817 		ncommits++;
2818 	}
2819 }
2820 
2821 static const struct got_error *
2822 draw_commits(struct tog_view *view)
2823 {
2824 	const struct got_error *err = NULL;
2825 	struct tog_log_view_state *s = &view->state.log;
2826 	struct commit_queue_entry *entry = s->selected_entry;
2827 	int limit = view->nlines;
2828 	int width;
2829 	int ncommits, author_cols = 4, refstr_cols;
2830 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2831 	char *refs_str = NULL;
2832 	wchar_t *wline;
2833 	struct tog_color *tc;
2834 	static const size_t date_display_cols = 12;
2835 	struct got_reflist_head *refs;
2836 
2837 	if (view_is_hsplit_top(view))
2838 		--limit;  /* account for border */
2839 
2840 	if (s->selected_entry &&
2841 	    !(view->searching && view->search_next_done == 0)) {
2842 		err = got_object_id_str(&id_str, s->selected_entry->id);
2843 		if (err)
2844 			return err;
2845 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2846 		    s->selected_entry->id);
2847 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2848 		    s->repo);
2849 		if (err)
2850 			goto done;
2851 	}
2852 
2853 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2854 		halfdelay(10); /* disable fast refresh */
2855 
2856 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2857 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2858 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2859 		    (view->searching && !view->search_next_done) ?
2860 		    "searching..." : "loading...") == -1) {
2861 			err = got_error_from_errno("asprintf");
2862 			goto done;
2863 		}
2864 	} else {
2865 		const char *search_str = NULL;
2866 		const char *limit_str = NULL;
2867 
2868 		if (view->searching) {
2869 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2870 				search_str = "no more matches";
2871 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2872 				search_str = "no matches found";
2873 			else if (!view->search_next_done)
2874 				search_str = "searching...";
2875 		}
2876 
2877 		if (s->limit_view && s->commits->ncommits == 0)
2878 			limit_str = "no matches found";
2879 
2880 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2881 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2882 		    search_str ? search_str : (refs_str ? refs_str : ""),
2883 		    limit_str ? limit_str : "") == -1) {
2884 			err = got_error_from_errno("asprintf");
2885 			goto done;
2886 		}
2887 	}
2888 
2889 	free(refs_str);
2890 	refs_str = NULL;
2891 
2892 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2893 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2894 		    "........................................",
2895 		    s->in_repo_path, ncommits_str) == -1) {
2896 			err = got_error_from_errno("asprintf");
2897 			header = NULL;
2898 			goto done;
2899 		}
2900 	} else if (asprintf(&header, "commit %s%s",
2901 	    id_str ? id_str : "........................................",
2902 	    ncommits_str) == -1) {
2903 		err = got_error_from_errno("asprintf");
2904 		header = NULL;
2905 		goto done;
2906 	}
2907 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2908 	if (err)
2909 		goto done;
2910 
2911 	werase(view->window);
2912 
2913 	if (view_needs_focus_indication(view))
2914 		wstandout(view->window);
2915 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2916 	if (tc)
2917 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2918 	waddwstr(view->window, wline);
2919 	while (width < view->ncols) {
2920 		waddch(view->window, ' ');
2921 		width++;
2922 	}
2923 	if (tc)
2924 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2925 	if (view_needs_focus_indication(view))
2926 		wstandend(view->window);
2927 	free(wline);
2928 	if (limit <= 1)
2929 		goto done;
2930 
2931 	/* Grow author column size if necessary, and set view->maxx. */
2932 	entry = s->first_displayed_entry;
2933 	ncommits = 0;
2934 	view->maxx = 0;
2935 	while (entry) {
2936 		struct got_commit_object *c = entry->commit;
2937 		char *author, *eol, *msg, *msg0;
2938 		wchar_t *wauthor, *wmsg;
2939 		int width;
2940 		if (ncommits >= limit - 1)
2941 			break;
2942 		if (s->use_committer)
2943 			author = strdup(got_object_commit_get_committer(c));
2944 		else
2945 			author = strdup(got_object_commit_get_author(c));
2946 		if (author == NULL) {
2947 			err = got_error_from_errno("strdup");
2948 			goto done;
2949 		}
2950 		err = format_author(&wauthor, &width, author, COLS,
2951 		    date_display_cols);
2952 		if (author_cols < width)
2953 			author_cols = width;
2954 		free(wauthor);
2955 		free(author);
2956 		if (err)
2957 			goto done;
2958 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2959 		    entry->id);
2960 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2961 		if (err)
2962 			goto done;
2963 		if (refs_str) {
2964 			wchar_t *ws;
2965 			err = format_line(&ws, &width, NULL, refs_str,
2966 			    0, INT_MAX, date_display_cols + author_cols, 0);
2967 			free(ws);
2968 			free(refs_str);
2969 			refs_str = NULL;
2970 			if (err)
2971 				goto done;
2972 			refstr_cols = width + 3; /* account for [ ] + space */
2973 		} else
2974 			refstr_cols = 0;
2975 		err = got_object_commit_get_logmsg(&msg0, c);
2976 		if (err)
2977 			goto done;
2978 		msg = msg0;
2979 		while (*msg == '\n')
2980 			++msg;
2981 		if ((eol = strchr(msg, '\n')))
2982 			*eol = '\0';
2983 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2984 		    date_display_cols + author_cols + refstr_cols, 0);
2985 		if (err)
2986 			goto done;
2987 		view->maxx = MAX(view->maxx, width + refstr_cols);
2988 		free(msg0);
2989 		free(wmsg);
2990 		ncommits++;
2991 		entry = TAILQ_NEXT(entry, entry);
2992 	}
2993 
2994 	entry = s->first_displayed_entry;
2995 	s->last_displayed_entry = s->first_displayed_entry;
2996 	ncommits = 0;
2997 	while (entry) {
2998 		if (ncommits >= limit - 1)
2999 			break;
3000 		if (ncommits == s->selected)
3001 			wstandout(view->window);
3002 		err = draw_commit(view, entry, date_display_cols, author_cols);
3003 		if (ncommits == s->selected)
3004 			wstandend(view->window);
3005 		if (err)
3006 			goto done;
3007 		ncommits++;
3008 		s->last_displayed_entry = entry;
3009 		entry = TAILQ_NEXT(entry, entry);
3010 	}
3011 
3012 	view_border(view);
3013 done:
3014 	free(id_str);
3015 	free(refs_str);
3016 	free(ncommits_str);
3017 	free(header);
3018 	return err;
3019 }
3020 
3021 static void
3022 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3023 {
3024 	struct commit_queue_entry *entry;
3025 	int nscrolled = 0;
3026 
3027 	entry = TAILQ_FIRST(&s->commits->head);
3028 	if (s->first_displayed_entry == entry)
3029 		return;
3030 
3031 	entry = s->first_displayed_entry;
3032 	while (entry && nscrolled < maxscroll) {
3033 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3034 		if (entry) {
3035 			s->first_displayed_entry = entry;
3036 			nscrolled++;
3037 		}
3038 	}
3039 }
3040 
3041 static const struct got_error *
3042 trigger_log_thread(struct tog_view *view, int wait)
3043 {
3044 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3045 	int errcode;
3046 
3047 	if (!using_mock_io)
3048 		halfdelay(1); /* fast refresh while loading commits */
3049 
3050 	while (!ta->log_complete && !tog_thread_error &&
3051 	    (ta->commits_needed > 0 || ta->load_all)) {
3052 		/* Wake the log thread. */
3053 		errcode = pthread_cond_signal(&ta->need_commits);
3054 		if (errcode)
3055 			return got_error_set_errno(errcode,
3056 			    "pthread_cond_signal");
3057 
3058 		/*
3059 		 * The mutex will be released while the view loop waits
3060 		 * in wgetch(), at which time the log thread will run.
3061 		 */
3062 		if (!wait)
3063 			break;
3064 
3065 		/* Display progress update in log view. */
3066 		show_log_view(view);
3067 		update_panels();
3068 		doupdate();
3069 
3070 		/* Wait right here while next commit is being loaded. */
3071 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3072 		if (errcode)
3073 			return got_error_set_errno(errcode,
3074 			    "pthread_cond_wait");
3075 
3076 		/* Display progress update in log view. */
3077 		show_log_view(view);
3078 		update_panels();
3079 		doupdate();
3080 	}
3081 
3082 	return NULL;
3083 }
3084 
3085 static const struct got_error *
3086 request_log_commits(struct tog_view *view)
3087 {
3088 	struct tog_log_view_state	*state = &view->state.log;
3089 	const struct got_error		*err = NULL;
3090 
3091 	if (state->thread_args.log_complete)
3092 		return NULL;
3093 
3094 	state->thread_args.commits_needed += view->nscrolled;
3095 	err = trigger_log_thread(view, 1);
3096 	view->nscrolled = 0;
3097 
3098 	return err;
3099 }
3100 
3101 static const struct got_error *
3102 log_scroll_down(struct tog_view *view, int maxscroll)
3103 {
3104 	struct tog_log_view_state *s = &view->state.log;
3105 	const struct got_error *err = NULL;
3106 	struct commit_queue_entry *pentry;
3107 	int nscrolled = 0, ncommits_needed;
3108 
3109 	if (s->last_displayed_entry == NULL)
3110 		return NULL;
3111 
3112 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3113 	if (s->commits->ncommits < ncommits_needed &&
3114 	    !s->thread_args.log_complete) {
3115 		/*
3116 		 * Ask the log thread for required amount of commits.
3117 		 */
3118 		s->thread_args.commits_needed +=
3119 		    ncommits_needed - s->commits->ncommits;
3120 		err = trigger_log_thread(view, 1);
3121 		if (err)
3122 			return err;
3123 	}
3124 
3125 	do {
3126 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3127 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3128 			break;
3129 
3130 		s->last_displayed_entry = pentry ?
3131 		    pentry : s->last_displayed_entry;
3132 
3133 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3134 		if (pentry == NULL)
3135 			break;
3136 		s->first_displayed_entry = pentry;
3137 	} while (++nscrolled < maxscroll);
3138 
3139 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3140 		view->nscrolled += nscrolled;
3141 	else
3142 		view->nscrolled = 0;
3143 
3144 	return err;
3145 }
3146 
3147 static const struct got_error *
3148 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3149     struct got_commit_object *commit, struct got_object_id *commit_id,
3150     struct tog_view *log_view, struct got_repository *repo)
3151 {
3152 	const struct got_error *err;
3153 	struct got_object_qid *parent_id;
3154 	struct tog_view *diff_view;
3155 
3156 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3157 	if (diff_view == NULL)
3158 		return got_error_from_errno("view_open");
3159 
3160 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3161 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3162 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3163 	if (err == NULL)
3164 		*new_view = diff_view;
3165 	return err;
3166 }
3167 
3168 static const struct got_error *
3169 tree_view_visit_subtree(struct tog_tree_view_state *s,
3170     struct got_tree_object *subtree)
3171 {
3172 	struct tog_parent_tree *parent;
3173 
3174 	parent = calloc(1, sizeof(*parent));
3175 	if (parent == NULL)
3176 		return got_error_from_errno("calloc");
3177 
3178 	parent->tree = s->tree;
3179 	parent->first_displayed_entry = s->first_displayed_entry;
3180 	parent->selected_entry = s->selected_entry;
3181 	parent->selected = s->selected;
3182 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3183 	s->tree = subtree;
3184 	s->selected = 0;
3185 	s->first_displayed_entry = NULL;
3186 	return NULL;
3187 }
3188 
3189 static const struct got_error *
3190 tree_view_walk_path(struct tog_tree_view_state *s,
3191     struct got_commit_object *commit, const char *path)
3192 {
3193 	const struct got_error *err = NULL;
3194 	struct got_tree_object *tree = NULL;
3195 	const char *p;
3196 	char *slash, *subpath = NULL;
3197 
3198 	/* Walk the path and open corresponding tree objects. */
3199 	p = path;
3200 	while (*p) {
3201 		struct got_tree_entry *te;
3202 		struct got_object_id *tree_id;
3203 		char *te_name;
3204 
3205 		while (p[0] == '/')
3206 			p++;
3207 
3208 		/* Ensure the correct subtree entry is selected. */
3209 		slash = strchr(p, '/');
3210 		if (slash == NULL)
3211 			te_name = strdup(p);
3212 		else
3213 			te_name = strndup(p, slash - p);
3214 		if (te_name == NULL) {
3215 			err = got_error_from_errno("strndup");
3216 			break;
3217 		}
3218 		te = got_object_tree_find_entry(s->tree, te_name);
3219 		if (te == NULL) {
3220 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3221 			free(te_name);
3222 			break;
3223 		}
3224 		free(te_name);
3225 		s->first_displayed_entry = s->selected_entry = te;
3226 
3227 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3228 			break; /* jump to this file's entry */
3229 
3230 		slash = strchr(p, '/');
3231 		if (slash)
3232 			subpath = strndup(path, slash - path);
3233 		else
3234 			subpath = strdup(path);
3235 		if (subpath == NULL) {
3236 			err = got_error_from_errno("strdup");
3237 			break;
3238 		}
3239 
3240 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3241 		    subpath);
3242 		if (err)
3243 			break;
3244 
3245 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3246 		free(tree_id);
3247 		if (err)
3248 			break;
3249 
3250 		err = tree_view_visit_subtree(s, tree);
3251 		if (err) {
3252 			got_object_tree_close(tree);
3253 			break;
3254 		}
3255 		if (slash == NULL)
3256 			break;
3257 		free(subpath);
3258 		subpath = NULL;
3259 		p = slash;
3260 	}
3261 
3262 	free(subpath);
3263 	return err;
3264 }
3265 
3266 static const struct got_error *
3267 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3268     struct commit_queue_entry *entry, const char *path,
3269     const char *head_ref_name, struct got_repository *repo)
3270 {
3271 	const struct got_error *err = NULL;
3272 	struct tog_tree_view_state *s;
3273 	struct tog_view *tree_view;
3274 
3275 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3276 	if (tree_view == NULL)
3277 		return got_error_from_errno("view_open");
3278 
3279 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3280 	if (err)
3281 		return err;
3282 	s = &tree_view->state.tree;
3283 
3284 	*new_view = tree_view;
3285 
3286 	if (got_path_is_root_dir(path))
3287 		return NULL;
3288 
3289 	return tree_view_walk_path(s, entry->commit, path);
3290 }
3291 
3292 static const struct got_error *
3293 block_signals_used_by_main_thread(void)
3294 {
3295 	sigset_t sigset;
3296 	int errcode;
3297 
3298 	if (sigemptyset(&sigset) == -1)
3299 		return got_error_from_errno("sigemptyset");
3300 
3301 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3302 	if (sigaddset(&sigset, SIGWINCH) == -1)
3303 		return got_error_from_errno("sigaddset");
3304 	if (sigaddset(&sigset, SIGCONT) == -1)
3305 		return got_error_from_errno("sigaddset");
3306 	if (sigaddset(&sigset, SIGINT) == -1)
3307 		return got_error_from_errno("sigaddset");
3308 	if (sigaddset(&sigset, SIGTERM) == -1)
3309 		return got_error_from_errno("sigaddset");
3310 
3311 	/* ncurses handles SIGTSTP */
3312 	if (sigaddset(&sigset, SIGTSTP) == -1)
3313 		return got_error_from_errno("sigaddset");
3314 
3315 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3316 	if (errcode)
3317 		return got_error_set_errno(errcode, "pthread_sigmask");
3318 
3319 	return NULL;
3320 }
3321 
3322 static void *
3323 log_thread(void *arg)
3324 {
3325 	const struct got_error *err = NULL;
3326 	int errcode = 0;
3327 	struct tog_log_thread_args *a = arg;
3328 	int done = 0;
3329 
3330 	/*
3331 	 * Sync startup with main thread such that we begin our
3332 	 * work once view_input() has released the mutex.
3333 	 */
3334 	errcode = pthread_mutex_lock(&tog_mutex);
3335 	if (errcode) {
3336 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3337 		return (void *)err;
3338 	}
3339 
3340 	err = block_signals_used_by_main_thread();
3341 	if (err) {
3342 		pthread_mutex_unlock(&tog_mutex);
3343 		goto done;
3344 	}
3345 
3346 	while (!done && !err && !tog_fatal_signal_received()) {
3347 		errcode = pthread_mutex_unlock(&tog_mutex);
3348 		if (errcode) {
3349 			err = got_error_set_errno(errcode,
3350 			    "pthread_mutex_unlock");
3351 			goto done;
3352 		}
3353 		err = queue_commits(a);
3354 		if (err) {
3355 			if (err->code != GOT_ERR_ITER_COMPLETED)
3356 				goto done;
3357 			err = NULL;
3358 			done = 1;
3359 			a->commits_needed = 0;
3360 		} else if (a->commits_needed > 0 && !a->load_all) {
3361 			if (*a->limiting) {
3362 				if (a->limit_match)
3363 					a->commits_needed--;
3364 			} else
3365 				a->commits_needed--;
3366 		}
3367 
3368 		errcode = pthread_mutex_lock(&tog_mutex);
3369 		if (errcode) {
3370 			err = got_error_set_errno(errcode,
3371 			    "pthread_mutex_lock");
3372 			goto done;
3373 		} else if (*a->quit)
3374 			done = 1;
3375 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3376 			*a->first_displayed_entry =
3377 			    TAILQ_FIRST(&a->limit_commits->head);
3378 			*a->selected_entry = *a->first_displayed_entry;
3379 		} else if (*a->first_displayed_entry == NULL) {
3380 			*a->first_displayed_entry =
3381 			    TAILQ_FIRST(&a->real_commits->head);
3382 			*a->selected_entry = *a->first_displayed_entry;
3383 		}
3384 
3385 		errcode = pthread_cond_signal(&a->commit_loaded);
3386 		if (errcode) {
3387 			err = got_error_set_errno(errcode,
3388 			    "pthread_cond_signal");
3389 			pthread_mutex_unlock(&tog_mutex);
3390 			goto done;
3391 		}
3392 
3393 		if (a->commits_needed == 0 &&
3394 		    a->need_commit_marker && a->worktree) {
3395 			errcode = pthread_mutex_unlock(&tog_mutex);
3396 			if (errcode) {
3397 				err = got_error_set_errno(errcode,
3398 				    "pthread_mutex_unlock");
3399 				goto done;
3400 			}
3401 			err = got_worktree_get_state(&tog_base_commit.marker,
3402 			    a->repo, a->worktree, NULL, NULL);
3403 			if (err)
3404 				goto done;
3405 			errcode = pthread_mutex_lock(&tog_mutex);
3406 			if (errcode) {
3407 				err = got_error_set_errno(errcode,
3408 				    "pthread_mutex_lock");
3409 				goto done;
3410 			}
3411 			a->need_commit_marker = 0;
3412 			/*
3413 			 * The main thread did not close this
3414 			 * work tree yet. Close it now.
3415 			 */
3416 			got_worktree_close(a->worktree);
3417 			a->worktree = NULL;
3418 
3419 			if (*a->quit)
3420 				done = 1;
3421 		}
3422 
3423 		if (done)
3424 			a->commits_needed = 0;
3425 		else {
3426 			if (a->commits_needed == 0 && !a->load_all) {
3427 				if (tog_io.wait_for_ui) {
3428 					errcode = pthread_cond_signal(
3429 					    &a->log_loaded);
3430 					if (errcode && err == NULL)
3431 						err = got_error_set_errno(
3432 						    errcode,
3433 						    "pthread_cond_signal");
3434 				}
3435 
3436 				errcode = pthread_cond_wait(&a->need_commits,
3437 				    &tog_mutex);
3438 				if (errcode) {
3439 					err = got_error_set_errno(errcode,
3440 					    "pthread_cond_wait");
3441 					pthread_mutex_unlock(&tog_mutex);
3442 					goto done;
3443 				}
3444 				if (*a->quit)
3445 					done = 1;
3446 			}
3447 		}
3448 	}
3449 	a->log_complete = 1;
3450 	if (tog_io.wait_for_ui) {
3451 		errcode = pthread_cond_signal(&a->log_loaded);
3452 		if (errcode && err == NULL)
3453 			err = got_error_set_errno(errcode,
3454 			    "pthread_cond_signal");
3455 	}
3456 
3457 	errcode = pthread_mutex_unlock(&tog_mutex);
3458 	if (errcode)
3459 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3460 done:
3461 	if (err) {
3462 		tog_thread_error = 1;
3463 		pthread_cond_signal(&a->commit_loaded);
3464 		if (a->worktree) {
3465 			got_worktree_close(a->worktree);
3466 			a->worktree = NULL;
3467 		}
3468 	}
3469 	return (void *)err;
3470 }
3471 
3472 static const struct got_error *
3473 stop_log_thread(struct tog_log_view_state *s)
3474 {
3475 	const struct got_error *err = NULL, *thread_err = NULL;
3476 	int errcode;
3477 
3478 	if (s->thread) {
3479 		s->quit = 1;
3480 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3481 		if (errcode)
3482 			return got_error_set_errno(errcode,
3483 			    "pthread_cond_signal");
3484 		errcode = pthread_mutex_unlock(&tog_mutex);
3485 		if (errcode)
3486 			return got_error_set_errno(errcode,
3487 			    "pthread_mutex_unlock");
3488 		errcode = pthread_join(s->thread, (void **)&thread_err);
3489 		if (errcode)
3490 			return got_error_set_errno(errcode, "pthread_join");
3491 		errcode = pthread_mutex_lock(&tog_mutex);
3492 		if (errcode)
3493 			return got_error_set_errno(errcode,
3494 			    "pthread_mutex_lock");
3495 		s->thread = NULL;
3496 	}
3497 
3498 	if (s->thread_args.repo) {
3499 		err = got_repo_close(s->thread_args.repo);
3500 		s->thread_args.repo = NULL;
3501 	}
3502 
3503 	if (s->thread_args.pack_fds) {
3504 		const struct got_error *pack_err =
3505 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3506 		if (err == NULL)
3507 			err = pack_err;
3508 		s->thread_args.pack_fds = NULL;
3509 	}
3510 
3511 	if (s->thread_args.graph) {
3512 		got_commit_graph_close(s->thread_args.graph);
3513 		s->thread_args.graph = NULL;
3514 	}
3515 
3516 	return err ? err : thread_err;
3517 }
3518 
3519 static const struct got_error *
3520 close_log_view(struct tog_view *view)
3521 {
3522 	const struct got_error *err = NULL;
3523 	struct tog_log_view_state *s = &view->state.log;
3524 	int errcode;
3525 
3526 	err = stop_log_thread(s);
3527 
3528 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3529 	if (errcode && err == NULL)
3530 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3531 
3532 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3533 	if (errcode && err == NULL)
3534 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3535 
3536 	free_commits(&s->limit_commits);
3537 	free_commits(&s->real_commits);
3538 	free(s->in_repo_path);
3539 	s->in_repo_path = NULL;
3540 	free(s->start_id);
3541 	s->start_id = NULL;
3542 	free(s->head_ref_name);
3543 	s->head_ref_name = NULL;
3544 	return err;
3545 }
3546 
3547 /*
3548  * We use two queues to implement the limit feature: first consists of
3549  * commits matching the current limit_regex; second is the real queue
3550  * of all known commits (real_commits). When the user starts limiting,
3551  * we swap queues such that all movement and displaying functionality
3552  * works with very slight change.
3553  */
3554 static const struct got_error *
3555 limit_log_view(struct tog_view *view)
3556 {
3557 	struct tog_log_view_state *s = &view->state.log;
3558 	struct commit_queue_entry *entry;
3559 	struct tog_view	*v = view;
3560 	const struct got_error *err = NULL;
3561 	char pattern[1024];
3562 	int ret;
3563 
3564 	if (view_is_hsplit_top(view))
3565 		v = view->child;
3566 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3567 		v = view->parent;
3568 
3569 	if (tog_io.input_str != NULL) {
3570 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
3571 		    sizeof(pattern))
3572 			return got_error(GOT_ERR_NO_SPACE);
3573 	} else {
3574 		wmove(v->window, v->nlines - 1, 0);
3575 		wclrtoeol(v->window);
3576 		mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3577 		nodelay(v->window, FALSE);
3578 		nocbreak();
3579 		echo();
3580 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
3581 		cbreak();
3582 		noecho();
3583 		nodelay(v->window, TRUE);
3584 		if (ret == ERR)
3585 			return NULL;
3586 	}
3587 
3588 	if (*pattern == '\0') {
3589 		/*
3590 		 * Safety measure for the situation where the user
3591 		 * resets limit without previously limiting anything.
3592 		 */
3593 		if (!s->limit_view)
3594 			return NULL;
3595 
3596 		/*
3597 		 * User could have pressed Ctrl+L, which refreshed the
3598 		 * commit queues, it means we can't save previously
3599 		 * (before limit took place) displayed entries,
3600 		 * because they would point to already free'ed memory,
3601 		 * so we are forced to always select first entry of
3602 		 * the queue.
3603 		 */
3604 		s->commits = &s->real_commits;
3605 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3606 		s->selected_entry = s->first_displayed_entry;
3607 		s->selected = 0;
3608 		s->limit_view = 0;
3609 
3610 		return NULL;
3611 	}
3612 
3613 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3614 		return NULL;
3615 
3616 	s->limit_view = 1;
3617 
3618 	/* Clear the screen while loading limit view */
3619 	s->first_displayed_entry = NULL;
3620 	s->last_displayed_entry = NULL;
3621 	s->selected_entry = NULL;
3622 	s->commits = &s->limit_commits;
3623 
3624 	/* Prepare limit queue for new search */
3625 	free_commits(&s->limit_commits);
3626 	s->limit_commits.ncommits = 0;
3627 
3628 	/* First process commits, which are in queue already */
3629 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3630 		int have_match = 0;
3631 
3632 		err = match_commit(&have_match, entry->id,
3633 		    entry->commit, &s->limit_regex);
3634 		if (err)
3635 			return err;
3636 
3637 		if (have_match) {
3638 			struct commit_queue_entry *matched;
3639 
3640 			matched = alloc_commit_queue_entry(entry->commit,
3641 			    entry->id);
3642 			if (matched == NULL) {
3643 				err = got_error_from_errno(
3644 				    "alloc_commit_queue_entry");
3645 				break;
3646 			}
3647 			matched->commit = entry->commit;
3648 			got_object_commit_retain(entry->commit);
3649 
3650 			matched->idx = s->limit_commits.ncommits;
3651 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3652 			    matched, entry);
3653 			s->limit_commits.ncommits++;
3654 		}
3655 	}
3656 
3657 	/* Second process all the commits, until we fill the screen */
3658 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3659 	    !s->thread_args.log_complete) {
3660 		s->thread_args.commits_needed +=
3661 		    view->nlines - s->limit_commits.ncommits - 1;
3662 		err = trigger_log_thread(view, 1);
3663 		if (err)
3664 			return err;
3665 	}
3666 
3667 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3668 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3669 	s->selected = 0;
3670 
3671 	return NULL;
3672 }
3673 
3674 static const struct got_error *
3675 search_start_log_view(struct tog_view *view)
3676 {
3677 	struct tog_log_view_state *s = &view->state.log;
3678 
3679 	s->matched_entry = NULL;
3680 	s->search_entry = NULL;
3681 	return NULL;
3682 }
3683 
3684 static const struct got_error *
3685 search_next_log_view(struct tog_view *view)
3686 {
3687 	const struct got_error *err = NULL;
3688 	struct tog_log_view_state *s = &view->state.log;
3689 	struct commit_queue_entry *entry;
3690 
3691 	/* Display progress update in log view. */
3692 	show_log_view(view);
3693 	update_panels();
3694 	doupdate();
3695 
3696 	if (s->search_entry) {
3697 		if (!using_mock_io) {
3698 			int errcode, ch;
3699 
3700 			errcode = pthread_mutex_unlock(&tog_mutex);
3701 			if (errcode)
3702 				return got_error_set_errno(errcode,
3703 				    "pthread_mutex_unlock");
3704 			ch = wgetch(view->window);
3705 			errcode = pthread_mutex_lock(&tog_mutex);
3706 			if (errcode)
3707 				return got_error_set_errno(errcode,
3708 				    "pthread_mutex_lock");
3709 			if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3710 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3711 				return NULL;
3712 			}
3713 		}
3714 		if (view->searching == TOG_SEARCH_FORWARD)
3715 			entry = TAILQ_NEXT(s->search_entry, entry);
3716 		else
3717 			entry = TAILQ_PREV(s->search_entry,
3718 			    commit_queue_head, entry);
3719 	} else if (s->matched_entry) {
3720 		/*
3721 		 * If the user has moved the cursor after we hit a match,
3722 		 * the position from where we should continue searching
3723 		 * might have changed.
3724 		 */
3725 		if (view->searching == TOG_SEARCH_FORWARD)
3726 			entry = TAILQ_NEXT(s->selected_entry, entry);
3727 		else
3728 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3729 			    entry);
3730 	} else {
3731 		entry = s->selected_entry;
3732 	}
3733 
3734 	while (1) {
3735 		int have_match = 0;
3736 
3737 		if (entry == NULL) {
3738 			if (s->thread_args.log_complete ||
3739 			    view->searching == TOG_SEARCH_BACKWARD) {
3740 				view->search_next_done =
3741 				    (s->matched_entry == NULL ?
3742 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3743 				s->search_entry = NULL;
3744 				return NULL;
3745 			}
3746 			/*
3747 			 * Poke the log thread for more commits and return,
3748 			 * allowing the main loop to make progress. Search
3749 			 * will resume at s->search_entry once we come back.
3750 			 */
3751 			s->search_entry = s->selected_entry;
3752 			s->thread_args.commits_needed++;
3753 			return trigger_log_thread(view, 0);
3754 		}
3755 
3756 		err = match_commit(&have_match, entry->id, entry->commit,
3757 		    &view->regex);
3758 		if (err)
3759 			break;
3760 		if (have_match) {
3761 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3762 			s->matched_entry = entry;
3763 			break;
3764 		}
3765 
3766 		s->search_entry = entry;
3767 		if (view->searching == TOG_SEARCH_FORWARD)
3768 			entry = TAILQ_NEXT(entry, entry);
3769 		else
3770 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3771 	}
3772 
3773 	if (s->matched_entry) {
3774 		int cur = s->selected_entry->idx;
3775 		while (cur < s->matched_entry->idx) {
3776 			err = input_log_view(NULL, view, KEY_DOWN);
3777 			if (err)
3778 				return err;
3779 			cur++;
3780 		}
3781 		while (cur > s->matched_entry->idx) {
3782 			err = input_log_view(NULL, view, KEY_UP);
3783 			if (err)
3784 				return err;
3785 			cur--;
3786 		}
3787 	}
3788 
3789 	s->search_entry = NULL;
3790 
3791 	return NULL;
3792 }
3793 
3794 static const struct got_error *
3795 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3796     struct got_repository *repo, const char *head_ref_name,
3797     const char *in_repo_path, int log_branches,
3798     struct got_worktree *worktree)
3799 {
3800 	const struct got_error *err = NULL;
3801 	struct tog_log_view_state *s = &view->state.log;
3802 	struct got_repository *thread_repo = NULL;
3803 	struct got_commit_graph *thread_graph = NULL;
3804 	int errcode;
3805 
3806 	if (in_repo_path != s->in_repo_path) {
3807 		free(s->in_repo_path);
3808 		s->in_repo_path = strdup(in_repo_path);
3809 		if (s->in_repo_path == NULL) {
3810 			err = got_error_from_errno("strdup");
3811 			goto done;
3812 		}
3813 	}
3814 
3815 	/* The commit queue only contains commits being displayed. */
3816 	TAILQ_INIT(&s->real_commits.head);
3817 	s->real_commits.ncommits = 0;
3818 	s->commits = &s->real_commits;
3819 
3820 	TAILQ_INIT(&s->limit_commits.head);
3821 	s->limit_view = 0;
3822 	s->limit_commits.ncommits = 0;
3823 
3824 	s->repo = repo;
3825 	if (head_ref_name) {
3826 		s->head_ref_name = strdup(head_ref_name);
3827 		if (s->head_ref_name == NULL) {
3828 			err = got_error_from_errno("strdup");
3829 			goto done;
3830 		}
3831 	}
3832 	s->start_id = got_object_id_dup(start_id);
3833 	if (s->start_id == NULL) {
3834 		err = got_error_from_errno("got_object_id_dup");
3835 		goto done;
3836 	}
3837 	s->log_branches = log_branches;
3838 	s->use_committer = 1;
3839 
3840 	STAILQ_INIT(&s->colors);
3841 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3842 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3843 		    get_color_value("TOG_COLOR_COMMIT"));
3844 		if (err)
3845 			goto done;
3846 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3847 		    get_color_value("TOG_COLOR_AUTHOR"));
3848 		if (err) {
3849 			free_colors(&s->colors);
3850 			goto done;
3851 		}
3852 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3853 		    get_color_value("TOG_COLOR_DATE"));
3854 		if (err) {
3855 			free_colors(&s->colors);
3856 			goto done;
3857 		}
3858 	}
3859 
3860 	view->show = show_log_view;
3861 	view->input = input_log_view;
3862 	view->resize = resize_log_view;
3863 	view->close = close_log_view;
3864 	view->search_start = search_start_log_view;
3865 	view->search_next = search_next_log_view;
3866 
3867 	if (s->thread_args.pack_fds == NULL) {
3868 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3869 		if (err)
3870 			goto done;
3871 	}
3872 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3873 	    s->thread_args.pack_fds);
3874 	if (err)
3875 		goto done;
3876 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3877 	    !s->log_branches);
3878 	if (err)
3879 		goto done;
3880 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3881 	    s->repo, NULL, NULL);
3882 	if (err)
3883 		goto done;
3884 
3885 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3886 	if (errcode) {
3887 		err = got_error_set_errno(errcode, "pthread_cond_init");
3888 		goto done;
3889 	}
3890 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3891 	if (errcode) {
3892 		err = got_error_set_errno(errcode, "pthread_cond_init");
3893 		goto done;
3894 	}
3895 
3896 	if (using_mock_io) {
3897 		int rc;
3898 
3899 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3900 		if (rc)
3901 			return got_error_set_errno(rc, "pthread_cond_init");
3902 	}
3903 
3904 	s->thread_args.commits_needed = view->nlines;
3905 	s->thread_args.graph = thread_graph;
3906 	s->thread_args.real_commits = &s->real_commits;
3907 	s->thread_args.limit_commits = &s->limit_commits;
3908 	s->thread_args.in_repo_path = s->in_repo_path;
3909 	s->thread_args.start_id = s->start_id;
3910 	s->thread_args.repo = thread_repo;
3911 	s->thread_args.log_complete = 0;
3912 	s->thread_args.quit = &s->quit;
3913 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3914 	s->thread_args.selected_entry = &s->selected_entry;
3915 	s->thread_args.searching = &view->searching;
3916 	s->thread_args.search_next_done = &view->search_next_done;
3917 	s->thread_args.regex = &view->regex;
3918 	s->thread_args.limiting = &s->limit_view;
3919 	s->thread_args.limit_regex = &s->limit_regex;
3920 	s->thread_args.limit_commits = &s->limit_commits;
3921 	s->thread_args.worktree = worktree;
3922 	if (worktree)
3923 		s->thread_args.need_commit_marker = 1;
3924 done:
3925 	if (err) {
3926 		if (view->close == NULL)
3927 			close_log_view(view);
3928 		view_close(view);
3929 	}
3930 	return err;
3931 }
3932 
3933 static const struct got_error *
3934 show_log_view(struct tog_view *view)
3935 {
3936 	const struct got_error *err;
3937 	struct tog_log_view_state *s = &view->state.log;
3938 
3939 	if (s->thread == NULL) {
3940 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3941 		    &s->thread_args);
3942 		if (errcode)
3943 			return got_error_set_errno(errcode, "pthread_create");
3944 		if (s->thread_args.commits_needed > 0) {
3945 			err = trigger_log_thread(view, 1);
3946 			if (err)
3947 				return err;
3948 		}
3949 	}
3950 
3951 	return draw_commits(view);
3952 }
3953 
3954 static void
3955 log_move_cursor_up(struct tog_view *view, int page, int home)
3956 {
3957 	struct tog_log_view_state *s = &view->state.log;
3958 
3959 	if (s->first_displayed_entry == NULL)
3960 		return;
3961 	if (s->selected_entry->idx == 0)
3962 		view->count = 0;
3963 
3964 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3965 	    || home)
3966 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3967 
3968 	if (!page && !home && s->selected > 0)
3969 		--s->selected;
3970 	else
3971 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3972 
3973 	select_commit(s);
3974 	return;
3975 }
3976 
3977 static const struct got_error *
3978 log_move_cursor_down(struct tog_view *view, int page)
3979 {
3980 	struct tog_log_view_state	*s = &view->state.log;
3981 	const struct got_error		*err = NULL;
3982 	int				 eos = view->nlines - 2;
3983 
3984 	if (s->first_displayed_entry == NULL)
3985 		return NULL;
3986 
3987 	if (s->thread_args.log_complete &&
3988 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3989 		return NULL;
3990 
3991 	if (view_is_hsplit_top(view))
3992 		--eos;  /* border consumes the last line */
3993 
3994 	if (!page) {
3995 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3996 			++s->selected;
3997 		else
3998 			err = log_scroll_down(view, 1);
3999 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
4000 		struct commit_queue_entry *entry;
4001 		int n;
4002 
4003 		s->selected = 0;
4004 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
4005 		s->last_displayed_entry = entry;
4006 		for (n = 0; n <= eos; n++) {
4007 			if (entry == NULL)
4008 				break;
4009 			s->first_displayed_entry = entry;
4010 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
4011 		}
4012 		if (n > 0)
4013 			s->selected = n - 1;
4014 	} else {
4015 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
4016 		    s->thread_args.log_complete)
4017 			s->selected += MIN(page,
4018 			    s->commits->ncommits - s->selected_entry->idx - 1);
4019 		else
4020 			err = log_scroll_down(view, page);
4021 	}
4022 	if (err)
4023 		return err;
4024 
4025 	/*
4026 	 * We might necessarily overshoot in horizontal
4027 	 * splits; if so, select the last displayed commit.
4028 	 */
4029 	if (s->first_displayed_entry && s->last_displayed_entry) {
4030 		s->selected = MIN(s->selected,
4031 		    s->last_displayed_entry->idx -
4032 		    s->first_displayed_entry->idx);
4033 	}
4034 
4035 	select_commit(s);
4036 
4037 	if (s->thread_args.log_complete &&
4038 	    s->selected_entry->idx == s->commits->ncommits - 1)
4039 		view->count = 0;
4040 
4041 	return NULL;
4042 }
4043 
4044 static void
4045 view_get_split(struct tog_view *view, int *y, int *x)
4046 {
4047 	*x = 0;
4048 	*y = 0;
4049 
4050 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4051 		if (view->child && view->child->resized_y)
4052 			*y = view->child->resized_y;
4053 		else if (view->resized_y)
4054 			*y = view->resized_y;
4055 		else
4056 			*y = view_split_begin_y(view->lines);
4057 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4058 		if (view->child && view->child->resized_x)
4059 			*x = view->child->resized_x;
4060 		else if (view->resized_x)
4061 			*x = view->resized_x;
4062 		else
4063 			*x = view_split_begin_x(view->begin_x);
4064 	}
4065 }
4066 
4067 /* Split view horizontally at y and offset view->state->selected line. */
4068 static const struct got_error *
4069 view_init_hsplit(struct tog_view *view, int y)
4070 {
4071 	const struct got_error *err = NULL;
4072 
4073 	view->nlines = y;
4074 	view->ncols = COLS;
4075 	err = view_resize(view);
4076 	if (err)
4077 		return err;
4078 
4079 	err = offset_selection_down(view);
4080 
4081 	return err;
4082 }
4083 
4084 static const struct got_error *
4085 log_goto_line(struct tog_view *view, int nlines)
4086 {
4087 	const struct got_error		*err = NULL;
4088 	struct tog_log_view_state	*s = &view->state.log;
4089 	int				 g, idx = s->selected_entry->idx;
4090 
4091 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4092 		return NULL;
4093 
4094 	g = view->gline;
4095 	view->gline = 0;
4096 
4097 	if (g >= s->first_displayed_entry->idx + 1 &&
4098 	    g <= s->last_displayed_entry->idx + 1 &&
4099 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4100 		s->selected = g - s->first_displayed_entry->idx - 1;
4101 		select_commit(s);
4102 		return NULL;
4103 	}
4104 
4105 	if (idx + 1 < g) {
4106 		err = log_move_cursor_down(view, g - idx - 1);
4107 		if (!err && g > s->selected_entry->idx + 1)
4108 			err = log_move_cursor_down(view,
4109 			    g - s->first_displayed_entry->idx - 1);
4110 		if (err)
4111 			return err;
4112 	} else if (idx + 1 > g)
4113 		log_move_cursor_up(view, idx - g + 1, 0);
4114 
4115 	if (g < nlines && s->first_displayed_entry->idx == 0)
4116 		s->selected = g - 1;
4117 
4118 	select_commit(s);
4119 	return NULL;
4120 
4121 }
4122 
4123 static void
4124 horizontal_scroll_input(struct tog_view *view, int ch)
4125 {
4126 
4127 	switch (ch) {
4128 	case KEY_LEFT:
4129 	case 'h':
4130 		view->x -= MIN(view->x, 2);
4131 		if (view->x <= 0)
4132 			view->count = 0;
4133 		break;
4134 	case KEY_RIGHT:
4135 	case 'l':
4136 		if (view->x + view->ncols / 2 < view->maxx)
4137 			view->x += 2;
4138 		else
4139 			view->count = 0;
4140 		break;
4141 	case '0':
4142 		view->x = 0;
4143 		break;
4144 	case '$':
4145 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4146 		view->count = 0;
4147 		break;
4148 	default:
4149 		break;
4150 	}
4151 }
4152 
4153 static const struct got_error *
4154 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4155 {
4156 	const struct got_error *err = NULL;
4157 	struct tog_log_view_state *s = &view->state.log;
4158 	int eos, nscroll;
4159 
4160 	if (s->thread_args.load_all) {
4161 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4162 			s->thread_args.load_all = 0;
4163 		else if (s->thread_args.log_complete) {
4164 			err = log_move_cursor_down(view, s->commits->ncommits);
4165 			s->thread_args.load_all = 0;
4166 		}
4167 		if (err)
4168 			return err;
4169 	}
4170 
4171 	eos = nscroll = view->nlines - 1;
4172 	if (view_is_hsplit_top(view))
4173 		--eos;  /* border */
4174 
4175 	if (view->gline)
4176 		return log_goto_line(view, eos);
4177 
4178 	switch (ch) {
4179 	case '&':
4180 		err = limit_log_view(view);
4181 		break;
4182 	case 'q':
4183 		s->quit = 1;
4184 		break;
4185 	case '0':
4186 	case '$':
4187 	case KEY_RIGHT:
4188 	case 'l':
4189 	case KEY_LEFT:
4190 	case 'h':
4191 		horizontal_scroll_input(view, ch);
4192 		break;
4193 	case 'k':
4194 	case KEY_UP:
4195 	case '<':
4196 	case ',':
4197 	case CTRL('p'):
4198 		log_move_cursor_up(view, 0, 0);
4199 		break;
4200 	case 'g':
4201 	case '=':
4202 	case KEY_HOME:
4203 		log_move_cursor_up(view, 0, 1);
4204 		view->count = 0;
4205 		break;
4206 	case CTRL('u'):
4207 	case 'u':
4208 		nscroll /= 2;
4209 		/* FALL THROUGH */
4210 	case KEY_PPAGE:
4211 	case CTRL('b'):
4212 	case 'b':
4213 		log_move_cursor_up(view, nscroll, 0);
4214 		break;
4215 	case 'j':
4216 	case KEY_DOWN:
4217 	case '>':
4218 	case '.':
4219 	case CTRL('n'):
4220 		err = log_move_cursor_down(view, 0);
4221 		break;
4222 	case '@':
4223 		s->use_committer = !s->use_committer;
4224 		view->action = s->use_committer ?
4225 		    "show committer" : "show commit author";
4226 		break;
4227 	case 'G':
4228 	case '*':
4229 	case KEY_END: {
4230 		/* We don't know yet how many commits, so we're forced to
4231 		 * traverse them all. */
4232 		view->count = 0;
4233 		s->thread_args.load_all = 1;
4234 		if (!s->thread_args.log_complete)
4235 			return trigger_log_thread(view, 0);
4236 		err = log_move_cursor_down(view, s->commits->ncommits);
4237 		s->thread_args.load_all = 0;
4238 		break;
4239 	}
4240 	case CTRL('d'):
4241 	case 'd':
4242 		nscroll /= 2;
4243 		/* FALL THROUGH */
4244 	case KEY_NPAGE:
4245 	case CTRL('f'):
4246 	case 'f':
4247 	case ' ':
4248 		err = log_move_cursor_down(view, nscroll);
4249 		break;
4250 	case KEY_RESIZE:
4251 		if (s->selected > view->nlines - 2)
4252 			s->selected = view->nlines - 2;
4253 		if (s->selected > s->commits->ncommits - 1)
4254 			s->selected = s->commits->ncommits - 1;
4255 		select_commit(s);
4256 		if (s->commits->ncommits < view->nlines - 1 &&
4257 		    !s->thread_args.log_complete) {
4258 			s->thread_args.commits_needed += (view->nlines - 1) -
4259 			    s->commits->ncommits;
4260 			err = trigger_log_thread(view, 1);
4261 		}
4262 		break;
4263 	case KEY_ENTER:
4264 	case '\r':
4265 		view->count = 0;
4266 		if (s->selected_entry == NULL)
4267 			break;
4268 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4269 		break;
4270 	case 'T':
4271 		view->count = 0;
4272 		if (s->selected_entry == NULL)
4273 			break;
4274 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4275 		break;
4276 	case KEY_BACKSPACE:
4277 	case CTRL('l'):
4278 	case 'B':
4279 		view->count = 0;
4280 		if (ch == KEY_BACKSPACE &&
4281 		    got_path_is_root_dir(s->in_repo_path))
4282 			break;
4283 		err = stop_log_thread(s);
4284 		if (err)
4285 			return err;
4286 		if (ch == KEY_BACKSPACE) {
4287 			char *parent_path;
4288 			err = got_path_dirname(&parent_path, s->in_repo_path);
4289 			if (err)
4290 				return err;
4291 			free(s->in_repo_path);
4292 			s->in_repo_path = parent_path;
4293 			s->thread_args.in_repo_path = s->in_repo_path;
4294 		} else if (ch == CTRL('l')) {
4295 			struct got_object_id *start_id;
4296 			err = got_repo_match_object_id(&start_id, NULL,
4297 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4298 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4299 			if (err) {
4300 				if (s->head_ref_name == NULL ||
4301 				    err->code != GOT_ERR_NOT_REF)
4302 					return err;
4303 				/* Try to cope with deleted references. */
4304 				free(s->head_ref_name);
4305 				s->head_ref_name = NULL;
4306 				err = got_repo_match_object_id(&start_id,
4307 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4308 				    &tog_refs, s->repo);
4309 				if (err)
4310 					return err;
4311 			}
4312 			free(s->start_id);
4313 			s->start_id = start_id;
4314 			s->thread_args.start_id = s->start_id;
4315 		} else /* 'B' */
4316 			s->log_branches = !s->log_branches;
4317 
4318 		if (s->thread_args.pack_fds == NULL) {
4319 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4320 			if (err)
4321 				return err;
4322 		}
4323 		err = got_repo_open(&s->thread_args.repo,
4324 		    got_repo_get_path(s->repo), NULL,
4325 		    s->thread_args.pack_fds);
4326 		if (err)
4327 			return err;
4328 		tog_free_refs();
4329 		err = tog_load_refs(s->repo, 0);
4330 		if (err)
4331 			return err;
4332 		err = got_commit_graph_open(&s->thread_args.graph,
4333 		    s->in_repo_path, !s->log_branches);
4334 		if (err)
4335 			return err;
4336 		err = got_commit_graph_iter_start(s->thread_args.graph,
4337 		    s->start_id, s->repo, NULL, NULL);
4338 		if (err)
4339 			return err;
4340 		free_commits(&s->real_commits);
4341 		free_commits(&s->limit_commits);
4342 		s->first_displayed_entry = NULL;
4343 		s->last_displayed_entry = NULL;
4344 		s->selected_entry = NULL;
4345 		s->selected = 0;
4346 		s->thread_args.log_complete = 0;
4347 		s->quit = 0;
4348 		s->thread_args.commits_needed = view->lines;
4349 		s->matched_entry = NULL;
4350 		s->search_entry = NULL;
4351 		view->offset = 0;
4352 		break;
4353 	case 'R':
4354 		view->count = 0;
4355 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4356 		break;
4357 	default:
4358 		view->count = 0;
4359 		break;
4360 	}
4361 
4362 	return err;
4363 }
4364 
4365 static const struct got_error *
4366 apply_unveil(const char *repo_path, const char *worktree_path)
4367 {
4368 	const struct got_error *error;
4369 
4370 #ifdef PROFILE
4371 	if (unveil("gmon.out", "rwc") != 0)
4372 		return got_error_from_errno2("unveil", "gmon.out");
4373 #endif
4374 	if (repo_path && unveil(repo_path, "r") != 0)
4375 		return got_error_from_errno2("unveil", repo_path);
4376 
4377 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4378 		return got_error_from_errno2("unveil", worktree_path);
4379 
4380 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4381 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4382 
4383 	error = got_privsep_unveil_exec_helpers();
4384 	if (error != NULL)
4385 		return error;
4386 
4387 	if (unveil(NULL, NULL) != 0)
4388 		return got_error_from_errno("unveil");
4389 
4390 	return NULL;
4391 }
4392 
4393 static const struct got_error *
4394 init_mock_term(const char *test_script_path)
4395 {
4396 	const struct got_error	*err = NULL;
4397 	const char *screen_dump_path;
4398 	int in;
4399 
4400 	if (test_script_path == NULL || *test_script_path == '\0')
4401 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4402 
4403 	tog_io.f = fopen(test_script_path, "re");
4404 	if (tog_io.f == NULL) {
4405 		err = got_error_from_errno_fmt("fopen: %s",
4406 		    test_script_path);
4407 		goto done;
4408 	}
4409 
4410 	/* test mode, we don't want any output */
4411 	tog_io.cout = fopen("/dev/null", "w+");
4412 	if (tog_io.cout == NULL) {
4413 		err = got_error_from_errno2("fopen", "/dev/null");
4414 		goto done;
4415 	}
4416 
4417 	in = dup(fileno(tog_io.cout));
4418 	if (in == -1) {
4419 		err = got_error_from_errno("dup");
4420 		goto done;
4421 	}
4422 	tog_io.cin = fdopen(in, "r");
4423 	if (tog_io.cin == NULL) {
4424 		err = got_error_from_errno("fdopen");
4425 		close(in);
4426 		goto done;
4427 	}
4428 
4429 	screen_dump_path = getenv("TOG_SCR_DUMP");
4430 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4431 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4432 	tog_io.sdump = fopen(screen_dump_path, "we");
4433 	if (tog_io.sdump == NULL) {
4434 		err = got_error_from_errno2("fopen", screen_dump_path);
4435 		goto done;
4436 	}
4437 
4438 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4439 		err = got_error_from_errno("fseeko");
4440 		goto done;
4441 	}
4442 
4443 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4444 		err = got_error_msg(GOT_ERR_IO,
4445 		    "newterm: failed to initialise curses");
4446 
4447 	using_mock_io = 1;
4448 
4449 done:
4450 	if (err)
4451 		tog_io_close();
4452 	return err;
4453 }
4454 
4455 static void
4456 init_curses(void)
4457 {
4458 	if (using_mock_io) /* In test mode we use a fake terminal */
4459 		return;
4460 
4461 	initscr();
4462 
4463 	cbreak();
4464 	halfdelay(1); /* Fast refresh while initial view is loading. */
4465 	noecho();
4466 	nonl();
4467 	intrflush(stdscr, FALSE);
4468 	keypad(stdscr, TRUE);
4469 	curs_set(0);
4470 	if (getenv("TOG_COLORS") != NULL) {
4471 		start_color();
4472 		use_default_colors();
4473 	}
4474 
4475 	return;
4476 }
4477 
4478 static const struct got_error *
4479 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4480 {
4481 	tog_base_commit.id = got_object_id_dup(
4482 	    got_worktree_get_base_commit_id(worktree));
4483 	if (tog_base_commit.id == NULL)
4484 		return got_error_from_errno( "got_object_id_dup");
4485 
4486 	return NULL;
4487 }
4488 
4489 static const struct got_error *
4490 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4491     struct got_repository *repo, struct got_worktree *worktree)
4492 {
4493 	const struct got_error *err = NULL;
4494 
4495 	if (argc == 0) {
4496 		*in_repo_path = strdup("/");
4497 		if (*in_repo_path == NULL)
4498 			return got_error_from_errno("strdup");
4499 		return NULL;
4500 	}
4501 
4502 	if (worktree) {
4503 		const char *prefix = got_worktree_get_path_prefix(worktree);
4504 		char *p;
4505 
4506 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4507 		if (err)
4508 			return err;
4509 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4510 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4511 		    p) == -1) {
4512 			err = got_error_from_errno("asprintf");
4513 			*in_repo_path = NULL;
4514 		}
4515 		free(p);
4516 	} else
4517 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4518 
4519 	return err;
4520 }
4521 
4522 static const struct got_error *
4523 cmd_log(int argc, char *argv[])
4524 {
4525 	const struct got_error *error;
4526 	struct got_repository *repo = NULL;
4527 	struct got_worktree *worktree = NULL;
4528 	struct got_object_id *start_id = NULL;
4529 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4530 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4531 	struct got_reference *ref = NULL;
4532 	const char *head_ref_name = NULL;
4533 	int ch, log_branches = 0;
4534 	struct tog_view *view;
4535 	int *pack_fds = NULL;
4536 
4537 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4538 		switch (ch) {
4539 		case 'b':
4540 			log_branches = 1;
4541 			break;
4542 		case 'c':
4543 			start_commit = optarg;
4544 			break;
4545 		case 'r':
4546 			repo_path = realpath(optarg, NULL);
4547 			if (repo_path == NULL)
4548 				return got_error_from_errno2("realpath",
4549 				    optarg);
4550 			break;
4551 		default:
4552 			usage_log();
4553 			/* NOTREACHED */
4554 		}
4555 	}
4556 
4557 	argc -= optind;
4558 	argv += optind;
4559 
4560 	if (argc > 1)
4561 		usage_log();
4562 
4563 	error = got_repo_pack_fds_open(&pack_fds);
4564 	if (error != NULL)
4565 		goto done;
4566 
4567 	if (repo_path == NULL) {
4568 		cwd = getcwd(NULL, 0);
4569 		if (cwd == NULL) {
4570 			error = got_error_from_errno("getcwd");
4571 			goto done;
4572 		}
4573 		error = got_worktree_open(&worktree, cwd, NULL);
4574 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4575 			goto done;
4576 		if (worktree)
4577 			repo_path =
4578 			    strdup(got_worktree_get_repo_path(worktree));
4579 		else
4580 			repo_path = strdup(cwd);
4581 		if (repo_path == NULL) {
4582 			error = got_error_from_errno("strdup");
4583 			goto done;
4584 		}
4585 	}
4586 
4587 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4588 	if (error != NULL)
4589 		goto done;
4590 
4591 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4592 	    repo, worktree);
4593 	if (error)
4594 		goto done;
4595 
4596 	init_curses();
4597 
4598 	error = apply_unveil(got_repo_get_path(repo),
4599 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4600 	if (error)
4601 		goto done;
4602 
4603 	/* already loaded by tog_log_with_path()? */
4604 	if (TAILQ_EMPTY(&tog_refs)) {
4605 		error = tog_load_refs(repo, 0);
4606 		if (error)
4607 			goto done;
4608 	}
4609 
4610 	if (start_commit == NULL) {
4611 		error = got_repo_match_object_id(&start_id, &label,
4612 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4613 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4614 		if (error)
4615 			goto done;
4616 		head_ref_name = label;
4617 	} else {
4618 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4619 		    repo, worktree);
4620 		if (error != NULL)
4621 			goto done;
4622 		if (keyword_idstr != NULL)
4623 			start_commit = keyword_idstr;
4624 
4625 		error = got_ref_open(&ref, repo, start_commit, 0);
4626 		if (error == NULL)
4627 			head_ref_name = got_ref_get_name(ref);
4628 		else if (error->code != GOT_ERR_NOT_REF)
4629 			goto done;
4630 		error = got_repo_match_object_id(&start_id, NULL,
4631 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4632 		if (error)
4633 			goto done;
4634 	}
4635 
4636 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4637 	if (view == NULL) {
4638 		error = got_error_from_errno("view_open");
4639 		goto done;
4640 	}
4641 
4642 	if (worktree) {
4643 		error = set_tog_base_commit(repo, worktree);
4644 		if (error != NULL)
4645 			goto done;
4646 	}
4647 
4648 	error = open_log_view(view, start_id, repo, head_ref_name,
4649 	    in_repo_path, log_branches, worktree);
4650 	if (error)
4651 		goto done;
4652 
4653 	if (worktree) {
4654 		/* The work tree will be closed by the log thread. */
4655 		worktree = NULL;
4656 	}
4657 
4658 	error = view_loop(view);
4659 
4660 done:
4661 	free(tog_base_commit.id);
4662 	free(keyword_idstr);
4663 	free(in_repo_path);
4664 	free(repo_path);
4665 	free(cwd);
4666 	free(start_id);
4667 	free(label);
4668 	if (ref)
4669 		got_ref_close(ref);
4670 	if (repo) {
4671 		const struct got_error *close_err = got_repo_close(repo);
4672 		if (error == NULL)
4673 			error = close_err;
4674 	}
4675 	if (worktree)
4676 		got_worktree_close(worktree);
4677 	if (pack_fds) {
4678 		const struct got_error *pack_err =
4679 		    got_repo_pack_fds_close(pack_fds);
4680 		if (error == NULL)
4681 			error = pack_err;
4682 	}
4683 	tog_free_refs();
4684 	return error;
4685 }
4686 
4687 __dead static void
4688 usage_diff(void)
4689 {
4690 	endwin();
4691 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4692 	    "object1 object2\n", getprogname());
4693 	exit(1);
4694 }
4695 
4696 static int
4697 match_line(const char *line, regex_t *regex, size_t nmatch,
4698     regmatch_t *regmatch)
4699 {
4700 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4701 }
4702 
4703 static struct tog_color *
4704 match_color(struct tog_colors *colors, const char *line)
4705 {
4706 	struct tog_color *tc = NULL;
4707 
4708 	STAILQ_FOREACH(tc, colors, entry) {
4709 		if (match_line(line, &tc->regex, 0, NULL))
4710 			return tc;
4711 	}
4712 
4713 	return NULL;
4714 }
4715 
4716 static const struct got_error *
4717 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4718     WINDOW *window, int skipcol, regmatch_t *regmatch)
4719 {
4720 	const struct got_error *err = NULL;
4721 	char *exstr = NULL;
4722 	wchar_t *wline = NULL;
4723 	int rme, rms, n, width, scrollx;
4724 	int width0 = 0, width1 = 0, width2 = 0;
4725 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4726 
4727 	*wtotal = 0;
4728 
4729 	rms = regmatch->rm_so;
4730 	rme = regmatch->rm_eo;
4731 
4732 	err = expand_tab(&exstr, line);
4733 	if (err)
4734 		return err;
4735 
4736 	/* Split the line into 3 segments, according to match offsets. */
4737 	seg0 = strndup(exstr, rms);
4738 	if (seg0 == NULL) {
4739 		err = got_error_from_errno("strndup");
4740 		goto done;
4741 	}
4742 	seg1 = strndup(exstr + rms, rme - rms);
4743 	if (seg1 == NULL) {
4744 		err = got_error_from_errno("strndup");
4745 		goto done;
4746 	}
4747 	seg2 = strdup(exstr + rme);
4748 	if (seg2 == NULL) {
4749 		err = got_error_from_errno("strndup");
4750 		goto done;
4751 	}
4752 
4753 	/* draw up to matched token if we haven't scrolled past it */
4754 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4755 	    col_tab_align, 1);
4756 	if (err)
4757 		goto done;
4758 	n = MAX(width0 - skipcol, 0);
4759 	if (n) {
4760 		free(wline);
4761 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4762 		    wlimit, col_tab_align, 1);
4763 		if (err)
4764 			goto done;
4765 		waddwstr(window, &wline[scrollx]);
4766 		wlimit -= width;
4767 		*wtotal += width;
4768 	}
4769 
4770 	if (wlimit > 0) {
4771 		int i = 0, w = 0;
4772 		size_t wlen;
4773 
4774 		free(wline);
4775 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4776 		    col_tab_align, 1);
4777 		if (err)
4778 			goto done;
4779 		wlen = wcslen(wline);
4780 		while (i < wlen) {
4781 			width = wcwidth(wline[i]);
4782 			if (width == -1) {
4783 				/* should not happen, tabs are expanded */
4784 				err = got_error(GOT_ERR_RANGE);
4785 				goto done;
4786 			}
4787 			if (width0 + w + width > skipcol)
4788 				break;
4789 			w += width;
4790 			i++;
4791 		}
4792 		/* draw (visible part of) matched token (if scrolled into it) */
4793 		if (width1 - w > 0) {
4794 			wattron(window, A_STANDOUT);
4795 			waddwstr(window, &wline[i]);
4796 			wattroff(window, A_STANDOUT);
4797 			wlimit -= (width1 - w);
4798 			*wtotal += (width1 - w);
4799 		}
4800 	}
4801 
4802 	if (wlimit > 0) {  /* draw rest of line */
4803 		free(wline);
4804 		if (skipcol > width0 + width1) {
4805 			err = format_line(&wline, &width2, &scrollx, seg2,
4806 			    skipcol - (width0 + width1), wlimit,
4807 			    col_tab_align, 1);
4808 			if (err)
4809 				goto done;
4810 			waddwstr(window, &wline[scrollx]);
4811 		} else {
4812 			err = format_line(&wline, &width2, NULL, seg2, 0,
4813 			    wlimit, col_tab_align, 1);
4814 			if (err)
4815 				goto done;
4816 			waddwstr(window, wline);
4817 		}
4818 		*wtotal += width2;
4819 	}
4820 done:
4821 	free(wline);
4822 	free(exstr);
4823 	free(seg0);
4824 	free(seg1);
4825 	free(seg2);
4826 	return err;
4827 }
4828 
4829 static int
4830 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4831 {
4832 	FILE	*f = NULL;
4833 	int	*eof, *first, *selected;
4834 
4835 	if (view->type == TOG_VIEW_DIFF) {
4836 		struct tog_diff_view_state *s = &view->state.diff;
4837 
4838 		first = &s->first_displayed_line;
4839 		selected = first;
4840 		eof = &s->eof;
4841 		f = s->f;
4842 	} else if (view->type == TOG_VIEW_HELP) {
4843 		struct tog_help_view_state *s = &view->state.help;
4844 
4845 		first = &s->first_displayed_line;
4846 		selected = first;
4847 		eof = &s->eof;
4848 		f = s->f;
4849 	} else if (view->type == TOG_VIEW_BLAME) {
4850 		struct tog_blame_view_state *s = &view->state.blame;
4851 
4852 		first = &s->first_displayed_line;
4853 		selected = &s->selected_line;
4854 		eof = &s->eof;
4855 		f = s->blame.f;
4856 	} else
4857 		return 0;
4858 
4859 	/* Center gline in the middle of the page like vi(1). */
4860 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4861 		return 0;
4862 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4863 		rewind(f);
4864 		*eof = 0;
4865 		*first = 1;
4866 		*lineno = 0;
4867 		*nprinted = 0;
4868 		return 0;
4869 	}
4870 
4871 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4872 		view->gline : (view->nlines - 3) / 2 + 1;
4873 	view->gline = 0;
4874 
4875 	return 1;
4876 }
4877 
4878 static const struct got_error *
4879 draw_file(struct tog_view *view, const char *header)
4880 {
4881 	struct tog_diff_view_state *s = &view->state.diff;
4882 	regmatch_t *regmatch = &view->regmatch;
4883 	const struct got_error *err;
4884 	int nprinted = 0;
4885 	char *line;
4886 	size_t linesize = 0;
4887 	ssize_t linelen;
4888 	wchar_t *wline;
4889 	int width;
4890 	int max_lines = view->nlines;
4891 	int nlines = s->nlines;
4892 	off_t line_offset;
4893 
4894 	s->lineno = s->first_displayed_line - 1;
4895 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4896 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4897 		return got_error_from_errno("fseek");
4898 
4899 	werase(view->window);
4900 
4901 	if (view->gline > s->nlines - 1)
4902 		view->gline = s->nlines - 1;
4903 
4904 	if (header) {
4905 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4906 		    1 : view->gline - (view->nlines - 3) / 2 :
4907 		    s->lineno + s->selected_line;
4908 
4909 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4910 			return got_error_from_errno("asprintf");
4911 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4912 		    0, 0);
4913 		free(line);
4914 		if (err)
4915 			return err;
4916 
4917 		if (view_needs_focus_indication(view))
4918 			wstandout(view->window);
4919 		waddwstr(view->window, wline);
4920 		free(wline);
4921 		wline = NULL;
4922 		while (width++ < view->ncols)
4923 			waddch(view->window, ' ');
4924 		if (view_needs_focus_indication(view))
4925 			wstandend(view->window);
4926 
4927 		if (max_lines <= 1)
4928 			return NULL;
4929 		max_lines--;
4930 	}
4931 
4932 	s->eof = 0;
4933 	view->maxx = 0;
4934 	line = NULL;
4935 	while (max_lines > 0 && nprinted < max_lines) {
4936 		enum got_diff_line_type linetype;
4937 		attr_t attr = 0;
4938 
4939 		linelen = getline(&line, &linesize, s->f);
4940 		if (linelen == -1) {
4941 			if (feof(s->f)) {
4942 				s->eof = 1;
4943 				break;
4944 			}
4945 			free(line);
4946 			return got_ferror(s->f, GOT_ERR_IO);
4947 		}
4948 
4949 		if (++s->lineno < s->first_displayed_line)
4950 			continue;
4951 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4952 			continue;
4953 		if (s->lineno == view->hiline)
4954 			attr = A_STANDOUT;
4955 
4956 		/* Set view->maxx based on full line length. */
4957 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4958 		    view->x ? 1 : 0);
4959 		if (err) {
4960 			free(line);
4961 			return err;
4962 		}
4963 		view->maxx = MAX(view->maxx, width);
4964 		free(wline);
4965 		wline = NULL;
4966 
4967 		linetype = s->lines[s->lineno].type;
4968 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4969 		    linetype < GOT_DIFF_LINE_CONTEXT)
4970 			attr |= COLOR_PAIR(linetype);
4971 		if (attr)
4972 			wattron(view->window, attr);
4973 		if (s->first_displayed_line + nprinted == s->matched_line &&
4974 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4975 			err = add_matched_line(&width, line, view->ncols, 0,
4976 			    view->window, view->x, regmatch);
4977 			if (err) {
4978 				free(line);
4979 				return err;
4980 			}
4981 		} else {
4982 			int skip;
4983 			err = format_line(&wline, &width, &skip, line,
4984 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4985 			if (err) {
4986 				free(line);
4987 				return err;
4988 			}
4989 			waddwstr(view->window, &wline[skip]);
4990 			free(wline);
4991 			wline = NULL;
4992 		}
4993 		if (s->lineno == view->hiline) {
4994 			/* highlight full gline length */
4995 			while (width++ < view->ncols)
4996 				waddch(view->window, ' ');
4997 		} else {
4998 			if (width <= view->ncols - 1)
4999 				waddch(view->window, '\n');
5000 		}
5001 		if (attr)
5002 			wattroff(view->window, attr);
5003 		if (++nprinted == 1)
5004 			s->first_displayed_line = s->lineno;
5005 	}
5006 	free(line);
5007 	if (nprinted >= 1)
5008 		s->last_displayed_line = s->first_displayed_line +
5009 		    (nprinted - 1);
5010 	else
5011 		s->last_displayed_line = s->first_displayed_line;
5012 
5013 	view_border(view);
5014 
5015 	if (s->eof) {
5016 		while (nprinted < view->nlines) {
5017 			waddch(view->window, '\n');
5018 			nprinted++;
5019 		}
5020 
5021 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
5022 		    view->ncols, 0, 0);
5023 		if (err) {
5024 			return err;
5025 		}
5026 
5027 		wstandout(view->window);
5028 		waddwstr(view->window, wline);
5029 		free(wline);
5030 		wline = NULL;
5031 		wstandend(view->window);
5032 	}
5033 
5034 	return NULL;
5035 }
5036 
5037 static char *
5038 get_datestr(time_t *time, char *datebuf)
5039 {
5040 	struct tm mytm, *tm;
5041 	char *p, *s;
5042 
5043 	tm = gmtime_r(time, &mytm);
5044 	if (tm == NULL)
5045 		return NULL;
5046 	s = asctime_r(tm, datebuf);
5047 	if (s == NULL)
5048 		return NULL;
5049 	p = strchr(s, '\n');
5050 	if (p)
5051 		*p = '\0';
5052 	return s;
5053 }
5054 
5055 static const struct got_error *
5056 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5057     off_t off, uint8_t type)
5058 {
5059 	struct got_diff_line *p;
5060 
5061 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5062 	if (p == NULL)
5063 		return got_error_from_errno("reallocarray");
5064 	*lines = p;
5065 	(*lines)[*nlines].offset = off;
5066 	(*lines)[*nlines].type = type;
5067 	(*nlines)++;
5068 
5069 	return NULL;
5070 }
5071 
5072 static const struct got_error *
5073 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5074     struct got_diff_line *s_lines, size_t s_nlines)
5075 {
5076 	struct got_diff_line	*p;
5077 	char			 buf[BUFSIZ];
5078 	size_t			 i, r;
5079 
5080 	if (fseeko(src, 0L, SEEK_SET) == -1)
5081 		return got_error_from_errno("fseeko");
5082 
5083 	for (;;) {
5084 		r = fread(buf, 1, sizeof(buf), src);
5085 		if (r == 0) {
5086 			if (ferror(src))
5087 				return got_error_from_errno("fread");
5088 			if (feof(src))
5089 				break;
5090 		}
5091 		if (fwrite(buf, 1, r, dst) != r)
5092 			return got_ferror(dst, GOT_ERR_IO);
5093 	}
5094 
5095 	if (s_nlines == 0 && *d_nlines == 0)
5096 		return NULL;
5097 
5098 	/*
5099 	 * If commit info was in dst, increment line offsets
5100 	 * of the appended diff content, but skip s_lines[0]
5101 	 * because offset zero is already in *d_lines.
5102 	 */
5103 	if (*d_nlines > 0) {
5104 		for (i = 1; i < s_nlines; ++i)
5105 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5106 
5107 		if (s_nlines > 0) {
5108 			--s_nlines;
5109 			++s_lines;
5110 		}
5111 	}
5112 
5113 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5114 	if (p == NULL) {
5115 		/* d_lines is freed in close_diff_view() */
5116 		return got_error_from_errno("reallocarray");
5117 	}
5118 
5119 	*d_lines = p;
5120 
5121 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5122 	*d_nlines += s_nlines;
5123 
5124 	return NULL;
5125 }
5126 
5127 static const struct got_error *
5128 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5129     struct got_object_id *commit_id, struct got_reflist_head *refs,
5130     struct got_repository *repo, int ignore_ws, int force_text_diff,
5131     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5132 {
5133 	const struct got_error *err = NULL;
5134 	char datebuf[26], *datestr;
5135 	struct got_commit_object *commit;
5136 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5137 	time_t committer_time;
5138 	const char *author, *committer;
5139 	char *refs_str = NULL;
5140 	struct got_pathlist_entry *pe;
5141 	off_t outoff = 0;
5142 	int n;
5143 
5144 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5145 	if (err)
5146 		return err;
5147 
5148 	err = got_object_open_as_commit(&commit, repo, commit_id);
5149 	if (err)
5150 		return err;
5151 
5152 	err = got_object_id_str(&id_str, commit_id);
5153 	if (err) {
5154 		err = got_error_from_errno("got_object_id_str");
5155 		goto done;
5156 	}
5157 
5158 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5159 	if (err)
5160 		goto done;
5161 
5162 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5163 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5164 	if (n < 0) {
5165 		err = got_error_from_errno("fprintf");
5166 		goto done;
5167 	}
5168 	outoff += n;
5169 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5170 	if (err)
5171 		goto done;
5172 
5173 	n = fprintf(outfile, "from: %s\n",
5174 	    got_object_commit_get_author(commit));
5175 	if (n < 0) {
5176 		err = got_error_from_errno("fprintf");
5177 		goto done;
5178 	}
5179 	outoff += n;
5180 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5181 	if (err)
5182 		goto done;
5183 
5184 	author = got_object_commit_get_author(commit);
5185 	committer = got_object_commit_get_committer(commit);
5186 	if (strcmp(author, committer) != 0) {
5187 		n = fprintf(outfile, "via: %s\n", committer);
5188 		if (n < 0) {
5189 			err = got_error_from_errno("fprintf");
5190 			goto done;
5191 		}
5192 		outoff += n;
5193 		err = add_line_metadata(lines, nlines, outoff,
5194 		    GOT_DIFF_LINE_AUTHOR);
5195 		if (err)
5196 			goto done;
5197 	}
5198 	committer_time = got_object_commit_get_committer_time(commit);
5199 	datestr = get_datestr(&committer_time, datebuf);
5200 	if (datestr) {
5201 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5202 		if (n < 0) {
5203 			err = got_error_from_errno("fprintf");
5204 			goto done;
5205 		}
5206 		outoff += n;
5207 		err = add_line_metadata(lines, nlines, outoff,
5208 		    GOT_DIFF_LINE_DATE);
5209 		if (err)
5210 			goto done;
5211 	}
5212 	if (got_object_commit_get_nparents(commit) > 1) {
5213 		const struct got_object_id_queue *parent_ids;
5214 		struct got_object_qid *qid;
5215 		int pn = 1;
5216 		parent_ids = got_object_commit_get_parent_ids(commit);
5217 		STAILQ_FOREACH(qid, parent_ids, entry) {
5218 			err = got_object_id_str(&id_str, &qid->id);
5219 			if (err)
5220 				goto done;
5221 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5222 			if (n < 0) {
5223 				err = got_error_from_errno("fprintf");
5224 				goto done;
5225 			}
5226 			outoff += n;
5227 			err = add_line_metadata(lines, nlines, outoff,
5228 			    GOT_DIFF_LINE_META);
5229 			if (err)
5230 				goto done;
5231 			free(id_str);
5232 			id_str = NULL;
5233 		}
5234 	}
5235 
5236 	err = got_object_commit_get_logmsg(&logmsg, commit);
5237 	if (err)
5238 		goto done;
5239 	s = logmsg;
5240 	while ((line = strsep(&s, "\n")) != NULL) {
5241 		n = fprintf(outfile, "%s\n", line);
5242 		if (n < 0) {
5243 			err = got_error_from_errno("fprintf");
5244 			goto done;
5245 		}
5246 		outoff += n;
5247 		err = add_line_metadata(lines, nlines, outoff,
5248 		    GOT_DIFF_LINE_LOGMSG);
5249 		if (err)
5250 			goto done;
5251 	}
5252 
5253 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5254 		struct got_diff_changed_path *cp = pe->data;
5255 		int pad = dsa->max_path_len - pe->path_len + 1;
5256 
5257 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5258 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5259 		    dsa->rm_cols + 1, cp->rm);
5260 		if (n < 0) {
5261 			err = got_error_from_errno("fprintf");
5262 			goto done;
5263 		}
5264 		outoff += n;
5265 		err = add_line_metadata(lines, nlines, outoff,
5266 		    GOT_DIFF_LINE_CHANGES);
5267 		if (err)
5268 			goto done;
5269 	}
5270 
5271 	fputc('\n', outfile);
5272 	outoff++;
5273 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5274 	if (err)
5275 		goto done;
5276 
5277 	n = fprintf(outfile,
5278 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5279 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5280 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5281 	if (n < 0) {
5282 		err = got_error_from_errno("fprintf");
5283 		goto done;
5284 	}
5285 	outoff += n;
5286 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5287 	if (err)
5288 		goto done;
5289 
5290 	fputc('\n', outfile);
5291 	outoff++;
5292 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5293 done:
5294 	free(id_str);
5295 	free(logmsg);
5296 	free(refs_str);
5297 	got_object_commit_close(commit);
5298 	if (err) {
5299 		free(*lines);
5300 		*lines = NULL;
5301 		*nlines = 0;
5302 	}
5303 	return err;
5304 }
5305 
5306 static const struct got_error *
5307 create_diff(struct tog_diff_view_state *s)
5308 {
5309 	const struct got_error *err = NULL;
5310 	FILE *f = NULL, *tmp_diff_file = NULL;
5311 	int obj_type;
5312 	struct got_diff_line *lines = NULL;
5313 	struct got_pathlist_head changed_paths;
5314 
5315 	TAILQ_INIT(&changed_paths);
5316 
5317 	free(s->lines);
5318 	s->lines = malloc(sizeof(*s->lines));
5319 	if (s->lines == NULL)
5320 		return got_error_from_errno("malloc");
5321 	s->nlines = 0;
5322 
5323 	f = got_opentemp();
5324 	if (f == NULL) {
5325 		err = got_error_from_errno("got_opentemp");
5326 		goto done;
5327 	}
5328 	tmp_diff_file = got_opentemp();
5329 	if (tmp_diff_file == NULL) {
5330 		err = got_error_from_errno("got_opentemp");
5331 		goto done;
5332 	}
5333 	if (s->f && fclose(s->f) == EOF) {
5334 		err = got_error_from_errno("fclose");
5335 		goto done;
5336 	}
5337 	s->f = f;
5338 
5339 	if (s->id1)
5340 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5341 	else
5342 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5343 	if (err)
5344 		goto done;
5345 
5346 	switch (obj_type) {
5347 	case GOT_OBJ_TYPE_BLOB:
5348 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5349 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5350 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5351 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5352 		    s->f);
5353 		break;
5354 	case GOT_OBJ_TYPE_TREE:
5355 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5356 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5357 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5358 		    s->force_text_diff, NULL, s->repo, s->f);
5359 		break;
5360 	case GOT_OBJ_TYPE_COMMIT: {
5361 		const struct got_object_id_queue *parent_ids;
5362 		struct got_object_qid *pid;
5363 		struct got_commit_object *commit2;
5364 		struct got_reflist_head *refs;
5365 		size_t nlines = 0;
5366 		struct got_diffstat_cb_arg dsa = {
5367 			0, 0, 0, 0, 0, 0,
5368 			&changed_paths,
5369 			s->ignore_whitespace,
5370 			s->force_text_diff,
5371 			tog_diff_algo
5372 		};
5373 
5374 		lines = malloc(sizeof(*lines));
5375 		if (lines == NULL) {
5376 			err = got_error_from_errno("malloc");
5377 			goto done;
5378 		}
5379 
5380 		/* build diff first in tmp file then append to commit info */
5381 		err = got_diff_objects_as_commits(&lines, &nlines,
5382 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5383 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5384 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5385 		if (err)
5386 			break;
5387 
5388 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5389 		if (err)
5390 			goto done;
5391 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5392 		/* Show commit info if we're diffing to a parent/root commit. */
5393 		if (s->id1 == NULL) {
5394 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5395 			    refs, s->repo, s->ignore_whitespace,
5396 			    s->force_text_diff, &dsa, s->f);
5397 			if (err)
5398 				goto done;
5399 		} else {
5400 			parent_ids = got_object_commit_get_parent_ids(commit2);
5401 			STAILQ_FOREACH(pid, parent_ids, entry) {
5402 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5403 					err = write_commit_info(&s->lines,
5404 					    &s->nlines, s->id2, refs, s->repo,
5405 					    s->ignore_whitespace,
5406 					    s->force_text_diff, &dsa, s->f);
5407 					if (err)
5408 						goto done;
5409 					break;
5410 				}
5411 			}
5412 		}
5413 		got_object_commit_close(commit2);
5414 
5415 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5416 		    lines, nlines);
5417 		break;
5418 	}
5419 	default:
5420 		err = got_error(GOT_ERR_OBJ_TYPE);
5421 		break;
5422 	}
5423 done:
5424 	free(lines);
5425 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5426 	if (s->f && fflush(s->f) != 0 && err == NULL)
5427 		err = got_error_from_errno("fflush");
5428 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5429 		err = got_error_from_errno("fclose");
5430 	return err;
5431 }
5432 
5433 static void
5434 diff_view_indicate_progress(struct tog_view *view)
5435 {
5436 	mvwaddstr(view->window, 0, 0, "diffing...");
5437 	update_panels();
5438 	doupdate();
5439 }
5440 
5441 static const struct got_error *
5442 search_start_diff_view(struct tog_view *view)
5443 {
5444 	struct tog_diff_view_state *s = &view->state.diff;
5445 
5446 	s->matched_line = 0;
5447 	return NULL;
5448 }
5449 
5450 static void
5451 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5452     size_t *nlines, int **first, int **last, int **match, int **selected)
5453 {
5454 	struct tog_diff_view_state *s = &view->state.diff;
5455 
5456 	*f = s->f;
5457 	*nlines = s->nlines;
5458 	*line_offsets = NULL;
5459 	*match = &s->matched_line;
5460 	*first = &s->first_displayed_line;
5461 	*last = &s->last_displayed_line;
5462 	*selected = &s->selected_line;
5463 }
5464 
5465 static const struct got_error *
5466 search_next_view_match(struct tog_view *view)
5467 {
5468 	const struct got_error *err = NULL;
5469 	FILE *f;
5470 	int lineno;
5471 	char *line = NULL;
5472 	size_t linesize = 0;
5473 	ssize_t linelen;
5474 	off_t *line_offsets;
5475 	size_t nlines = 0;
5476 	int *first, *last, *match, *selected;
5477 
5478 	if (!view->search_setup)
5479 		return got_error_msg(GOT_ERR_NOT_IMPL,
5480 		    "view search not supported");
5481 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5482 	    &match, &selected);
5483 
5484 	if (!view->searching) {
5485 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5486 		return NULL;
5487 	}
5488 
5489 	if (*match) {
5490 		if (view->searching == TOG_SEARCH_FORWARD)
5491 			lineno = *first + 1;
5492 		else
5493 			lineno = *first - 1;
5494 	} else
5495 		lineno = *first - 1 + *selected;
5496 
5497 	while (1) {
5498 		off_t offset;
5499 
5500 		if (lineno <= 0 || lineno > nlines) {
5501 			if (*match == 0) {
5502 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5503 				break;
5504 			}
5505 
5506 			if (view->searching == TOG_SEARCH_FORWARD)
5507 				lineno = 1;
5508 			else
5509 				lineno = nlines;
5510 		}
5511 
5512 		offset = view->type == TOG_VIEW_DIFF ?
5513 		    view->state.diff.lines[lineno - 1].offset :
5514 		    line_offsets[lineno - 1];
5515 		if (fseeko(f, offset, SEEK_SET) != 0) {
5516 			free(line);
5517 			return got_error_from_errno("fseeko");
5518 		}
5519 		linelen = getline(&line, &linesize, f);
5520 		if (linelen != -1) {
5521 			char *exstr;
5522 			err = expand_tab(&exstr, line);
5523 			if (err)
5524 				break;
5525 			if (match_line(exstr, &view->regex, 1,
5526 			    &view->regmatch)) {
5527 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5528 				*match = lineno;
5529 				free(exstr);
5530 				break;
5531 			}
5532 			free(exstr);
5533 		}
5534 		if (view->searching == TOG_SEARCH_FORWARD)
5535 			lineno++;
5536 		else
5537 			lineno--;
5538 	}
5539 	free(line);
5540 
5541 	if (*match) {
5542 		*first = *match;
5543 		*selected = 1;
5544 	}
5545 
5546 	return err;
5547 }
5548 
5549 static const struct got_error *
5550 close_diff_view(struct tog_view *view)
5551 {
5552 	const struct got_error *err = NULL;
5553 	struct tog_diff_view_state *s = &view->state.diff;
5554 
5555 	free(s->id1);
5556 	s->id1 = NULL;
5557 	free(s->id2);
5558 	s->id2 = NULL;
5559 	if (s->f && fclose(s->f) == EOF)
5560 		err = got_error_from_errno("fclose");
5561 	s->f = NULL;
5562 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5563 		err = got_error_from_errno("fclose");
5564 	s->f1 = NULL;
5565 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5566 		err = got_error_from_errno("fclose");
5567 	s->f2 = NULL;
5568 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5569 		err = got_error_from_errno("close");
5570 	s->fd1 = -1;
5571 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5572 		err = got_error_from_errno("close");
5573 	s->fd2 = -1;
5574 	free(s->lines);
5575 	s->lines = NULL;
5576 	s->nlines = 0;
5577 	return err;
5578 }
5579 
5580 static const struct got_error *
5581 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5582     struct got_object_id *id2, const char *label1, const char *label2,
5583     int diff_context, int ignore_whitespace, int force_text_diff,
5584     struct tog_view *parent_view, struct got_repository *repo)
5585 {
5586 	const struct got_error *err;
5587 	struct tog_diff_view_state *s = &view->state.diff;
5588 
5589 	memset(s, 0, sizeof(*s));
5590 	s->fd1 = -1;
5591 	s->fd2 = -1;
5592 
5593 	if (id1 != NULL && id2 != NULL) {
5594 		int type1, type2;
5595 
5596 		err = got_object_get_type(&type1, repo, id1);
5597 		if (err)
5598 			goto done;
5599 		err = got_object_get_type(&type2, repo, id2);
5600 		if (err)
5601 			goto done;
5602 
5603 		if (type1 != type2) {
5604 			err = got_error(GOT_ERR_OBJ_TYPE);
5605 			goto done;
5606 		}
5607 	}
5608 	s->first_displayed_line = 1;
5609 	s->last_displayed_line = view->nlines;
5610 	s->selected_line = 1;
5611 	s->repo = repo;
5612 	s->id1 = id1;
5613 	s->id2 = id2;
5614 	s->label1 = label1;
5615 	s->label2 = label2;
5616 
5617 	if (id1) {
5618 		s->id1 = got_object_id_dup(id1);
5619 		if (s->id1 == NULL) {
5620 			err = got_error_from_errno("got_object_id_dup");
5621 			goto done;
5622 		}
5623 	} else
5624 		s->id1 = NULL;
5625 
5626 	s->id2 = got_object_id_dup(id2);
5627 	if (s->id2 == NULL) {
5628 		err = got_error_from_errno("got_object_id_dup");
5629 		goto done;
5630 	}
5631 
5632 	s->f1 = got_opentemp();
5633 	if (s->f1 == NULL) {
5634 		err = got_error_from_errno("got_opentemp");
5635 		goto done;
5636 	}
5637 
5638 	s->f2 = got_opentemp();
5639 	if (s->f2 == NULL) {
5640 		err = got_error_from_errno("got_opentemp");
5641 		goto done;
5642 	}
5643 
5644 	s->fd1 = got_opentempfd();
5645 	if (s->fd1 == -1) {
5646 		err = got_error_from_errno("got_opentempfd");
5647 		goto done;
5648 	}
5649 
5650 	s->fd2 = got_opentempfd();
5651 	if (s->fd2 == -1) {
5652 		err = got_error_from_errno("got_opentempfd");
5653 		goto done;
5654 	}
5655 
5656 	s->diff_context = diff_context;
5657 	s->ignore_whitespace = ignore_whitespace;
5658 	s->force_text_diff = force_text_diff;
5659 	s->parent_view = parent_view;
5660 	s->repo = repo;
5661 
5662 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5663 		int rc;
5664 
5665 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5666 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5667 		if (rc != ERR)
5668 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5669 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5670 		if (rc != ERR)
5671 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5672 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5673 		if (rc != ERR)
5674 			rc = init_pair(GOT_DIFF_LINE_META,
5675 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5676 		if (rc != ERR)
5677 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5678 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5679 		if (rc != ERR)
5680 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5681 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5682 		if (rc != ERR)
5683 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5684 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5685 		if (rc != ERR)
5686 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5687 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5688 		if (rc != ERR)
5689 			rc = init_pair(GOT_DIFF_LINE_DATE,
5690 			    get_color_value("TOG_COLOR_DATE"), -1);
5691 		if (rc == ERR) {
5692 			err = got_error(GOT_ERR_RANGE);
5693 			goto done;
5694 		}
5695 	}
5696 
5697 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5698 	    view_is_splitscreen(view))
5699 		show_log_view(parent_view); /* draw border */
5700 	diff_view_indicate_progress(view);
5701 
5702 	err = create_diff(s);
5703 
5704 	view->show = show_diff_view;
5705 	view->input = input_diff_view;
5706 	view->reset = reset_diff_view;
5707 	view->close = close_diff_view;
5708 	view->search_start = search_start_diff_view;
5709 	view->search_setup = search_setup_diff_view;
5710 	view->search_next = search_next_view_match;
5711 done:
5712 	if (err) {
5713 		if (view->close == NULL)
5714 			close_diff_view(view);
5715 		view_close(view);
5716 	}
5717 	return err;
5718 }
5719 
5720 static const struct got_error *
5721 show_diff_view(struct tog_view *view)
5722 {
5723 	const struct got_error *err;
5724 	struct tog_diff_view_state *s = &view->state.diff;
5725 	char *id_str1 = NULL, *id_str2, *header;
5726 	const char *label1, *label2;
5727 
5728 	if (s->id1) {
5729 		err = got_object_id_str(&id_str1, s->id1);
5730 		if (err)
5731 			return err;
5732 		label1 = s->label1 ? s->label1 : id_str1;
5733 	} else
5734 		label1 = "/dev/null";
5735 
5736 	err = got_object_id_str(&id_str2, s->id2);
5737 	if (err)
5738 		return err;
5739 	label2 = s->label2 ? s->label2 : id_str2;
5740 
5741 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5742 		err = got_error_from_errno("asprintf");
5743 		free(id_str1);
5744 		free(id_str2);
5745 		return err;
5746 	}
5747 	free(id_str1);
5748 	free(id_str2);
5749 
5750 	err = draw_file(view, header);
5751 	free(header);
5752 	return err;
5753 }
5754 
5755 static const struct got_error *
5756 set_selected_commit(struct tog_diff_view_state *s,
5757     struct commit_queue_entry *entry)
5758 {
5759 	const struct got_error *err;
5760 	const struct got_object_id_queue *parent_ids;
5761 	struct got_commit_object *selected_commit;
5762 	struct got_object_qid *pid;
5763 
5764 	free(s->id2);
5765 	s->id2 = got_object_id_dup(entry->id);
5766 	if (s->id2 == NULL)
5767 		return got_error_from_errno("got_object_id_dup");
5768 
5769 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5770 	if (err)
5771 		return err;
5772 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5773 	free(s->id1);
5774 	pid = STAILQ_FIRST(parent_ids);
5775 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5776 	got_object_commit_close(selected_commit);
5777 	return NULL;
5778 }
5779 
5780 static const struct got_error *
5781 reset_diff_view(struct tog_view *view)
5782 {
5783 	struct tog_diff_view_state *s = &view->state.diff;
5784 
5785 	view->count = 0;
5786 	wclear(view->window);
5787 	s->first_displayed_line = 1;
5788 	s->last_displayed_line = view->nlines;
5789 	s->matched_line = 0;
5790 	diff_view_indicate_progress(view);
5791 	return create_diff(s);
5792 }
5793 
5794 static void
5795 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5796 {
5797 	int start, i;
5798 
5799 	i = start = s->first_displayed_line - 1;
5800 
5801 	while (s->lines[i].type != type) {
5802 		if (i == 0)
5803 			i = s->nlines - 1;
5804 		if (--i == start)
5805 			return; /* do nothing, requested type not in file */
5806 	}
5807 
5808 	s->selected_line = 1;
5809 	s->first_displayed_line = i;
5810 }
5811 
5812 static void
5813 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5814 {
5815 	int start, i;
5816 
5817 	i = start = s->first_displayed_line + 1;
5818 
5819 	while (s->lines[i].type != type) {
5820 		if (i == s->nlines - 1)
5821 			i = 0;
5822 		if (++i == start)
5823 			return; /* do nothing, requested type not in file */
5824 	}
5825 
5826 	s->selected_line = 1;
5827 	s->first_displayed_line = i;
5828 }
5829 
5830 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5831     int, int, int);
5832 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5833     int, int);
5834 
5835 static const struct got_error *
5836 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5837 {
5838 	const struct got_error *err = NULL;
5839 	struct tog_diff_view_state *s = &view->state.diff;
5840 	struct tog_log_view_state *ls;
5841 	struct commit_queue_entry *old_selected_entry;
5842 	char *line = NULL;
5843 	size_t linesize = 0;
5844 	ssize_t linelen;
5845 	int i, nscroll = view->nlines - 1, up = 0;
5846 
5847 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5848 
5849 	switch (ch) {
5850 	case '0':
5851 	case '$':
5852 	case KEY_RIGHT:
5853 	case 'l':
5854 	case KEY_LEFT:
5855 	case 'h':
5856 		horizontal_scroll_input(view, ch);
5857 		break;
5858 	case 'a':
5859 	case 'w':
5860 		if (ch == 'a') {
5861 			s->force_text_diff = !s->force_text_diff;
5862 			view->action = s->force_text_diff ?
5863 			    "force ASCII text enabled" :
5864 			    "force ASCII text disabled";
5865 		}
5866 		else if (ch == 'w') {
5867 			s->ignore_whitespace = !s->ignore_whitespace;
5868 			view->action = s->ignore_whitespace ?
5869 			    "ignore whitespace enabled" :
5870 			    "ignore whitespace disabled";
5871 		}
5872 		err = reset_diff_view(view);
5873 		break;
5874 	case 'g':
5875 	case KEY_HOME:
5876 		s->first_displayed_line = 1;
5877 		view->count = 0;
5878 		break;
5879 	case 'G':
5880 	case KEY_END:
5881 		view->count = 0;
5882 		if (s->eof)
5883 			break;
5884 
5885 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5886 		s->eof = 1;
5887 		break;
5888 	case 'k':
5889 	case KEY_UP:
5890 	case CTRL('p'):
5891 		if (s->first_displayed_line > 1)
5892 			s->first_displayed_line--;
5893 		else
5894 			view->count = 0;
5895 		break;
5896 	case CTRL('u'):
5897 	case 'u':
5898 		nscroll /= 2;
5899 		/* FALL THROUGH */
5900 	case KEY_PPAGE:
5901 	case CTRL('b'):
5902 	case 'b':
5903 		if (s->first_displayed_line == 1) {
5904 			view->count = 0;
5905 			break;
5906 		}
5907 		i = 0;
5908 		while (i++ < nscroll && s->first_displayed_line > 1)
5909 			s->first_displayed_line--;
5910 		break;
5911 	case 'j':
5912 	case KEY_DOWN:
5913 	case CTRL('n'):
5914 		if (!s->eof)
5915 			s->first_displayed_line++;
5916 		else
5917 			view->count = 0;
5918 		break;
5919 	case CTRL('d'):
5920 	case 'd':
5921 		nscroll /= 2;
5922 		/* FALL THROUGH */
5923 	case KEY_NPAGE:
5924 	case CTRL('f'):
5925 	case 'f':
5926 	case ' ':
5927 		if (s->eof) {
5928 			view->count = 0;
5929 			break;
5930 		}
5931 		i = 0;
5932 		while (!s->eof && i++ < nscroll) {
5933 			linelen = getline(&line, &linesize, s->f);
5934 			s->first_displayed_line++;
5935 			if (linelen == -1) {
5936 				if (feof(s->f)) {
5937 					s->eof = 1;
5938 				} else
5939 					err = got_ferror(s->f, GOT_ERR_IO);
5940 				break;
5941 			}
5942 		}
5943 		free(line);
5944 		break;
5945 	case '(':
5946 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5947 		break;
5948 	case ')':
5949 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5950 		break;
5951 	case '{':
5952 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5953 		break;
5954 	case '}':
5955 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5956 		break;
5957 	case '[':
5958 		if (s->diff_context > 0) {
5959 			s->diff_context--;
5960 			s->matched_line = 0;
5961 			diff_view_indicate_progress(view);
5962 			err = create_diff(s);
5963 			if (s->first_displayed_line + view->nlines - 1 >
5964 			    s->nlines) {
5965 				s->first_displayed_line = 1;
5966 				s->last_displayed_line = view->nlines;
5967 			}
5968 		} else
5969 			view->count = 0;
5970 		break;
5971 	case ']':
5972 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5973 			s->diff_context++;
5974 			s->matched_line = 0;
5975 			diff_view_indicate_progress(view);
5976 			err = create_diff(s);
5977 		} else
5978 			view->count = 0;
5979 		break;
5980 	case '<':
5981 	case ',':
5982 	case 'K':
5983 		up = 1;
5984 		/* FALL THROUGH */
5985 	case '>':
5986 	case '.':
5987 	case 'J':
5988 		if (s->parent_view == NULL) {
5989 			view->count = 0;
5990 			break;
5991 		}
5992 		s->parent_view->count = view->count;
5993 
5994 		if (s->parent_view->type == TOG_VIEW_LOG) {
5995 			ls = &s->parent_view->state.log;
5996 			old_selected_entry = ls->selected_entry;
5997 
5998 			err = input_log_view(NULL, s->parent_view,
5999 			    up ? KEY_UP : KEY_DOWN);
6000 			if (err)
6001 				break;
6002 			view->count = s->parent_view->count;
6003 
6004 			if (old_selected_entry == ls->selected_entry)
6005 				break;
6006 
6007 			err = set_selected_commit(s, ls->selected_entry);
6008 			if (err)
6009 				break;
6010 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
6011 			struct tog_blame_view_state *bs;
6012 			struct got_object_id *id, *prev_id;
6013 
6014 			bs = &s->parent_view->state.blame;
6015 			prev_id = get_annotation_for_line(bs->blame.lines,
6016 			    bs->blame.nlines, bs->last_diffed_line);
6017 
6018 			err = input_blame_view(&view, s->parent_view,
6019 			    up ? KEY_UP : KEY_DOWN);
6020 			if (err)
6021 				break;
6022 			view->count = s->parent_view->count;
6023 
6024 			if (prev_id == NULL)
6025 				break;
6026 			id = get_selected_commit_id(bs->blame.lines,
6027 			    bs->blame.nlines, bs->first_displayed_line,
6028 			    bs->selected_line);
6029 			if (id == NULL)
6030 				break;
6031 
6032 			if (!got_object_id_cmp(prev_id, id))
6033 				break;
6034 
6035 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6036 			if (err)
6037 				break;
6038 		}
6039 		s->first_displayed_line = 1;
6040 		s->last_displayed_line = view->nlines;
6041 		s->matched_line = 0;
6042 		view->x = 0;
6043 
6044 		diff_view_indicate_progress(view);
6045 		err = create_diff(s);
6046 		break;
6047 	default:
6048 		view->count = 0;
6049 		break;
6050 	}
6051 
6052 	return err;
6053 }
6054 
6055 static const struct got_error *
6056 cmd_diff(int argc, char *argv[])
6057 {
6058 	const struct got_error *error;
6059 	struct got_repository *repo = NULL;
6060 	struct got_worktree *worktree = NULL;
6061 	struct got_object_id *id1 = NULL, *id2 = NULL;
6062 	char *repo_path = NULL, *cwd = NULL;
6063 	char *id_str1 = NULL, *id_str2 = NULL;
6064 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6065 	char *label1 = NULL, *label2 = NULL;
6066 	int diff_context = 3, ignore_whitespace = 0;
6067 	int ch, force_text_diff = 0;
6068 	const char *errstr;
6069 	struct tog_view *view;
6070 	int *pack_fds = NULL;
6071 
6072 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6073 		switch (ch) {
6074 		case 'a':
6075 			force_text_diff = 1;
6076 			break;
6077 		case 'C':
6078 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6079 			    &errstr);
6080 			if (errstr != NULL)
6081 				errx(1, "number of context lines is %s: %s",
6082 				    errstr, errstr);
6083 			break;
6084 		case 'r':
6085 			repo_path = realpath(optarg, NULL);
6086 			if (repo_path == NULL)
6087 				return got_error_from_errno2("realpath",
6088 				    optarg);
6089 			got_path_strip_trailing_slashes(repo_path);
6090 			break;
6091 		case 'w':
6092 			ignore_whitespace = 1;
6093 			break;
6094 		default:
6095 			usage_diff();
6096 			/* NOTREACHED */
6097 		}
6098 	}
6099 
6100 	argc -= optind;
6101 	argv += optind;
6102 
6103 	if (argc == 0) {
6104 		usage_diff(); /* TODO show local worktree changes */
6105 	} else if (argc == 2) {
6106 		id_str1 = argv[0];
6107 		id_str2 = argv[1];
6108 	} else
6109 		usage_diff();
6110 
6111 	error = got_repo_pack_fds_open(&pack_fds);
6112 	if (error)
6113 		goto done;
6114 
6115 	if (repo_path == NULL) {
6116 		cwd = getcwd(NULL, 0);
6117 		if (cwd == NULL)
6118 			return got_error_from_errno("getcwd");
6119 		error = got_worktree_open(&worktree, cwd, NULL);
6120 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6121 			goto done;
6122 		if (worktree)
6123 			repo_path =
6124 			    strdup(got_worktree_get_repo_path(worktree));
6125 		else
6126 			repo_path = strdup(cwd);
6127 		if (repo_path == NULL) {
6128 			error = got_error_from_errno("strdup");
6129 			goto done;
6130 		}
6131 	}
6132 
6133 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6134 	if (error)
6135 		goto done;
6136 
6137 	init_curses();
6138 
6139 	error = apply_unveil(got_repo_get_path(repo), NULL);
6140 	if (error)
6141 		goto done;
6142 
6143 	error = tog_load_refs(repo, 0);
6144 	if (error)
6145 		goto done;
6146 
6147 	if (id_str1 != NULL) {
6148 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6149 		    repo, worktree);
6150 		if (error != NULL)
6151 			goto done;
6152 		if (keyword_idstr1 != NULL)
6153 			id_str1 = keyword_idstr1;
6154 	}
6155 	if (id_str2 != NULL) {
6156 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6157 		    repo, worktree);
6158 		if (error != NULL)
6159 			goto done;
6160 		if (keyword_idstr2 != NULL)
6161 			id_str2 = keyword_idstr2;
6162 	}
6163 
6164 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6165 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6166 	if (error)
6167 		goto done;
6168 
6169 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6170 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6171 	if (error)
6172 		goto done;
6173 
6174 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6175 	if (view == NULL) {
6176 		error = got_error_from_errno("view_open");
6177 		goto done;
6178 	}
6179 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6180 	    ignore_whitespace, force_text_diff, NULL,  repo);
6181 	if (error)
6182 		goto done;
6183 
6184 	if (worktree) {
6185 		error = set_tog_base_commit(repo, worktree);
6186 		if (error != NULL)
6187 			goto done;
6188 	}
6189 
6190 	error = view_loop(view);
6191 
6192 done:
6193 	free(tog_base_commit.id);
6194 	free(keyword_idstr1);
6195 	free(keyword_idstr2);
6196 	free(label1);
6197 	free(label2);
6198 	free(repo_path);
6199 	free(cwd);
6200 	if (repo) {
6201 		const struct got_error *close_err = got_repo_close(repo);
6202 		if (error == NULL)
6203 			error = close_err;
6204 	}
6205 	if (worktree)
6206 		got_worktree_close(worktree);
6207 	if (pack_fds) {
6208 		const struct got_error *pack_err =
6209 		    got_repo_pack_fds_close(pack_fds);
6210 		if (error == NULL)
6211 			error = pack_err;
6212 	}
6213 	tog_free_refs();
6214 	return error;
6215 }
6216 
6217 __dead static void
6218 usage_blame(void)
6219 {
6220 	endwin();
6221 	fprintf(stderr,
6222 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6223 	    getprogname());
6224 	exit(1);
6225 }
6226 
6227 struct tog_blame_line {
6228 	int annotated;
6229 	struct got_object_id *id;
6230 };
6231 
6232 static const struct got_error *
6233 draw_blame(struct tog_view *view)
6234 {
6235 	struct tog_blame_view_state *s = &view->state.blame;
6236 	struct tog_blame *blame = &s->blame;
6237 	regmatch_t *regmatch = &view->regmatch;
6238 	const struct got_error *err;
6239 	int lineno = 0, nprinted = 0;
6240 	char *line = NULL;
6241 	size_t linesize = 0;
6242 	ssize_t linelen;
6243 	wchar_t *wline;
6244 	int width;
6245 	struct tog_blame_line *blame_line;
6246 	struct got_object_id *prev_id = NULL;
6247 	char *id_str;
6248 	struct tog_color *tc;
6249 
6250 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6251 	if (err)
6252 		return err;
6253 
6254 	rewind(blame->f);
6255 	werase(view->window);
6256 
6257 	if (asprintf(&line, "commit %s", id_str) == -1) {
6258 		err = got_error_from_errno("asprintf");
6259 		free(id_str);
6260 		return err;
6261 	}
6262 
6263 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6264 	free(line);
6265 	line = NULL;
6266 	if (err)
6267 		return err;
6268 	if (view_needs_focus_indication(view))
6269 		wstandout(view->window);
6270 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6271 	if (tc)
6272 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6273 	waddwstr(view->window, wline);
6274 	while (width++ < view->ncols)
6275 		waddch(view->window, ' ');
6276 	if (tc)
6277 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6278 	if (view_needs_focus_indication(view))
6279 		wstandend(view->window);
6280 	free(wline);
6281 	wline = NULL;
6282 
6283 	if (view->gline > blame->nlines)
6284 		view->gline = blame->nlines;
6285 
6286 	if (tog_io.wait_for_ui) {
6287 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6288 		int rc;
6289 
6290 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6291 		if (rc)
6292 			return got_error_set_errno(rc, "pthread_cond_wait");
6293 		tog_io.wait_for_ui = 0;
6294 	}
6295 
6296 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6297 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6298 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6299 		free(id_str);
6300 		return got_error_from_errno("asprintf");
6301 	}
6302 	free(id_str);
6303 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6304 	free(line);
6305 	line = NULL;
6306 	if (err)
6307 		return err;
6308 	waddwstr(view->window, wline);
6309 	free(wline);
6310 	wline = NULL;
6311 	if (width < view->ncols - 1)
6312 		waddch(view->window, '\n');
6313 
6314 	s->eof = 0;
6315 	view->maxx = 0;
6316 	while (nprinted < view->nlines - 2) {
6317 		linelen = getline(&line, &linesize, blame->f);
6318 		if (linelen == -1) {
6319 			if (feof(blame->f)) {
6320 				s->eof = 1;
6321 				break;
6322 			}
6323 			free(line);
6324 			return got_ferror(blame->f, GOT_ERR_IO);
6325 		}
6326 		if (++lineno < s->first_displayed_line)
6327 			continue;
6328 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6329 			continue;
6330 
6331 		/* Set view->maxx based on full line length. */
6332 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6333 		if (err) {
6334 			free(line);
6335 			return err;
6336 		}
6337 		free(wline);
6338 		wline = NULL;
6339 		view->maxx = MAX(view->maxx, width);
6340 
6341 		if (nprinted == s->selected_line - 1)
6342 			wstandout(view->window);
6343 
6344 		if (blame->nlines > 0) {
6345 			blame_line = &blame->lines[lineno - 1];
6346 			if (blame_line->annotated && prev_id &&
6347 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6348 			    !(nprinted == s->selected_line - 1)) {
6349 				waddstr(view->window, "        ");
6350 			} else if (blame_line->annotated) {
6351 				char *id_str;
6352 				err = got_object_id_str(&id_str,
6353 				    blame_line->id);
6354 				if (err) {
6355 					free(line);
6356 					return err;
6357 				}
6358 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6359 				if (tc)
6360 					wattr_on(view->window,
6361 					    COLOR_PAIR(tc->colorpair), NULL);
6362 				wprintw(view->window, "%.8s", id_str);
6363 				if (tc)
6364 					wattr_off(view->window,
6365 					    COLOR_PAIR(tc->colorpair), NULL);
6366 				free(id_str);
6367 				prev_id = blame_line->id;
6368 			} else {
6369 				waddstr(view->window, "........");
6370 				prev_id = NULL;
6371 			}
6372 		} else {
6373 			waddstr(view->window, "........");
6374 			prev_id = NULL;
6375 		}
6376 
6377 		if (nprinted == s->selected_line - 1)
6378 			wstandend(view->window);
6379 		waddstr(view->window, " ");
6380 
6381 		if (view->ncols <= 9) {
6382 			width = 9;
6383 		} else if (s->first_displayed_line + nprinted ==
6384 		    s->matched_line &&
6385 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6386 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6387 			    view->window, view->x, regmatch);
6388 			if (err) {
6389 				free(line);
6390 				return err;
6391 			}
6392 			width += 9;
6393 		} else {
6394 			int skip;
6395 			err = format_line(&wline, &width, &skip, line,
6396 			    view->x, view->ncols - 9, 9, 1);
6397 			if (err) {
6398 				free(line);
6399 				return err;
6400 			}
6401 			waddwstr(view->window, &wline[skip]);
6402 			width += 9;
6403 			free(wline);
6404 			wline = NULL;
6405 		}
6406 
6407 		if (width <= view->ncols - 1)
6408 			waddch(view->window, '\n');
6409 		if (++nprinted == 1)
6410 			s->first_displayed_line = lineno;
6411 	}
6412 	free(line);
6413 	s->last_displayed_line = lineno;
6414 
6415 	view_border(view);
6416 
6417 	return NULL;
6418 }
6419 
6420 static const struct got_error *
6421 blame_cb(void *arg, int nlines, int lineno,
6422     struct got_commit_object *commit, struct got_object_id *id)
6423 {
6424 	const struct got_error *err = NULL;
6425 	struct tog_blame_cb_args *a = arg;
6426 	struct tog_blame_line *line;
6427 	int errcode;
6428 
6429 	if (nlines != a->nlines ||
6430 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6431 		return got_error(GOT_ERR_RANGE);
6432 
6433 	errcode = pthread_mutex_lock(&tog_mutex);
6434 	if (errcode)
6435 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6436 
6437 	if (*a->quit) {	/* user has quit the blame view */
6438 		err = got_error(GOT_ERR_ITER_COMPLETED);
6439 		goto done;
6440 	}
6441 
6442 	if (lineno == -1)
6443 		goto done; /* no change in this commit */
6444 
6445 	line = &a->lines[lineno - 1];
6446 	if (line->annotated)
6447 		goto done;
6448 
6449 	line->id = got_object_id_dup(id);
6450 	if (line->id == NULL) {
6451 		err = got_error_from_errno("got_object_id_dup");
6452 		goto done;
6453 	}
6454 	line->annotated = 1;
6455 done:
6456 	errcode = pthread_mutex_unlock(&tog_mutex);
6457 	if (errcode)
6458 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6459 	return err;
6460 }
6461 
6462 static void *
6463 blame_thread(void *arg)
6464 {
6465 	const struct got_error *err, *close_err;
6466 	struct tog_blame_thread_args *ta = arg;
6467 	struct tog_blame_cb_args *a = ta->cb_args;
6468 	int errcode, fd1 = -1, fd2 = -1;
6469 	FILE *f1 = NULL, *f2 = NULL;
6470 
6471 	fd1 = got_opentempfd();
6472 	if (fd1 == -1)
6473 		return (void *)got_error_from_errno("got_opentempfd");
6474 
6475 	fd2 = got_opentempfd();
6476 	if (fd2 == -1) {
6477 		err = got_error_from_errno("got_opentempfd");
6478 		goto done;
6479 	}
6480 
6481 	f1 = got_opentemp();
6482 	if (f1 == NULL) {
6483 		err = (void *)got_error_from_errno("got_opentemp");
6484 		goto done;
6485 	}
6486 	f2 = got_opentemp();
6487 	if (f2 == NULL) {
6488 		err = (void *)got_error_from_errno("got_opentemp");
6489 		goto done;
6490 	}
6491 
6492 	err = block_signals_used_by_main_thread();
6493 	if (err)
6494 		goto done;
6495 
6496 	err = got_blame(ta->path, a->commit_id, ta->repo,
6497 	    tog_diff_algo, blame_cb, ta->cb_args,
6498 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6499 	if (err && err->code == GOT_ERR_CANCELLED)
6500 		err = NULL;
6501 
6502 	errcode = pthread_mutex_lock(&tog_mutex);
6503 	if (errcode) {
6504 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6505 		goto done;
6506 	}
6507 
6508 	close_err = got_repo_close(ta->repo);
6509 	if (err == NULL)
6510 		err = close_err;
6511 	ta->repo = NULL;
6512 	*ta->complete = 1;
6513 
6514 	if (tog_io.wait_for_ui) {
6515 		errcode = pthread_cond_signal(&ta->blame_complete);
6516 		if (errcode && err == NULL)
6517 			err = got_error_set_errno(errcode,
6518 			    "pthread_cond_signal");
6519 	}
6520 
6521 	errcode = pthread_mutex_unlock(&tog_mutex);
6522 	if (errcode && err == NULL)
6523 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6524 
6525 done:
6526 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6527 		err = got_error_from_errno("close");
6528 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6529 		err = got_error_from_errno("close");
6530 	if (f1 && fclose(f1) == EOF && err == NULL)
6531 		err = got_error_from_errno("fclose");
6532 	if (f2 && fclose(f2) == EOF && err == NULL)
6533 		err = got_error_from_errno("fclose");
6534 
6535 	return (void *)err;
6536 }
6537 
6538 static struct got_object_id *
6539 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6540     int first_displayed_line, int selected_line)
6541 {
6542 	struct tog_blame_line *line;
6543 
6544 	if (nlines <= 0)
6545 		return NULL;
6546 
6547 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6548 	if (!line->annotated)
6549 		return NULL;
6550 
6551 	return line->id;
6552 }
6553 
6554 static struct got_object_id *
6555 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6556     int lineno)
6557 {
6558 	struct tog_blame_line *line;
6559 
6560 	if (nlines <= 0 || lineno >= nlines)
6561 		return NULL;
6562 
6563 	line = &lines[lineno - 1];
6564 	if (!line->annotated)
6565 		return NULL;
6566 
6567 	return line->id;
6568 }
6569 
6570 static const struct got_error *
6571 stop_blame(struct tog_blame *blame)
6572 {
6573 	const struct got_error *err = NULL;
6574 	int i;
6575 
6576 	if (blame->thread) {
6577 		int errcode;
6578 		errcode = pthread_mutex_unlock(&tog_mutex);
6579 		if (errcode)
6580 			return got_error_set_errno(errcode,
6581 			    "pthread_mutex_unlock");
6582 		errcode = pthread_join(blame->thread, (void **)&err);
6583 		if (errcode)
6584 			return got_error_set_errno(errcode, "pthread_join");
6585 		errcode = pthread_mutex_lock(&tog_mutex);
6586 		if (errcode)
6587 			return got_error_set_errno(errcode,
6588 			    "pthread_mutex_lock");
6589 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6590 			err = NULL;
6591 		blame->thread = NULL;
6592 	}
6593 	if (blame->thread_args.repo) {
6594 		const struct got_error *close_err;
6595 		close_err = got_repo_close(blame->thread_args.repo);
6596 		if (err == NULL)
6597 			err = close_err;
6598 		blame->thread_args.repo = NULL;
6599 	}
6600 	if (blame->f) {
6601 		if (fclose(blame->f) == EOF && err == NULL)
6602 			err = got_error_from_errno("fclose");
6603 		blame->f = NULL;
6604 	}
6605 	if (blame->lines) {
6606 		for (i = 0; i < blame->nlines; i++)
6607 			free(blame->lines[i].id);
6608 		free(blame->lines);
6609 		blame->lines = NULL;
6610 	}
6611 	free(blame->cb_args.commit_id);
6612 	blame->cb_args.commit_id = NULL;
6613 	if (blame->pack_fds) {
6614 		const struct got_error *pack_err =
6615 		    got_repo_pack_fds_close(blame->pack_fds);
6616 		if (err == NULL)
6617 			err = pack_err;
6618 		blame->pack_fds = NULL;
6619 	}
6620 	free(blame->line_offsets);
6621 	blame->line_offsets = NULL;
6622 	return err;
6623 }
6624 
6625 static const struct got_error *
6626 cancel_blame_view(void *arg)
6627 {
6628 	const struct got_error *err = NULL;
6629 	int *done = arg;
6630 	int errcode;
6631 
6632 	errcode = pthread_mutex_lock(&tog_mutex);
6633 	if (errcode)
6634 		return got_error_set_errno(errcode,
6635 		    "pthread_mutex_unlock");
6636 
6637 	if (*done)
6638 		err = got_error(GOT_ERR_CANCELLED);
6639 
6640 	errcode = pthread_mutex_unlock(&tog_mutex);
6641 	if (errcode)
6642 		return got_error_set_errno(errcode,
6643 		    "pthread_mutex_lock");
6644 
6645 	return err;
6646 }
6647 
6648 static const struct got_error *
6649 run_blame(struct tog_view *view)
6650 {
6651 	struct tog_blame_view_state *s = &view->state.blame;
6652 	struct tog_blame *blame = &s->blame;
6653 	const struct got_error *err = NULL;
6654 	struct got_commit_object *commit = NULL;
6655 	struct got_blob_object *blob = NULL;
6656 	struct got_repository *thread_repo = NULL;
6657 	struct got_object_id *obj_id = NULL;
6658 	int obj_type, fd = -1;
6659 	int *pack_fds = NULL;
6660 
6661 	err = got_object_open_as_commit(&commit, s->repo,
6662 	    &s->blamed_commit->id);
6663 	if (err)
6664 		return err;
6665 
6666 	fd = got_opentempfd();
6667 	if (fd == -1) {
6668 		err = got_error_from_errno("got_opentempfd");
6669 		goto done;
6670 	}
6671 
6672 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6673 	if (err)
6674 		goto done;
6675 
6676 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6677 	if (err)
6678 		goto done;
6679 
6680 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6681 		err = got_error(GOT_ERR_OBJ_TYPE);
6682 		goto done;
6683 	}
6684 
6685 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6686 	if (err)
6687 		goto done;
6688 	blame->f = got_opentemp();
6689 	if (blame->f == NULL) {
6690 		err = got_error_from_errno("got_opentemp");
6691 		goto done;
6692 	}
6693 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6694 	    &blame->line_offsets, blame->f, blob);
6695 	if (err)
6696 		goto done;
6697 	if (blame->nlines == 0) {
6698 		s->blame_complete = 1;
6699 		goto done;
6700 	}
6701 
6702 	/* Don't include \n at EOF in the blame line count. */
6703 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6704 		blame->nlines--;
6705 
6706 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6707 	if (blame->lines == NULL) {
6708 		err = got_error_from_errno("calloc");
6709 		goto done;
6710 	}
6711 
6712 	err = got_repo_pack_fds_open(&pack_fds);
6713 	if (err)
6714 		goto done;
6715 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6716 	    pack_fds);
6717 	if (err)
6718 		goto done;
6719 
6720 	blame->pack_fds = pack_fds;
6721 	blame->cb_args.view = view;
6722 	blame->cb_args.lines = blame->lines;
6723 	blame->cb_args.nlines = blame->nlines;
6724 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6725 	if (blame->cb_args.commit_id == NULL) {
6726 		err = got_error_from_errno("got_object_id_dup");
6727 		goto done;
6728 	}
6729 	blame->cb_args.quit = &s->done;
6730 
6731 	blame->thread_args.path = s->path;
6732 	blame->thread_args.repo = thread_repo;
6733 	blame->thread_args.cb_args = &blame->cb_args;
6734 	blame->thread_args.complete = &s->blame_complete;
6735 	blame->thread_args.cancel_cb = cancel_blame_view;
6736 	blame->thread_args.cancel_arg = &s->done;
6737 	s->blame_complete = 0;
6738 
6739 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6740 		s->first_displayed_line = 1;
6741 		s->last_displayed_line = view->nlines;
6742 		s->selected_line = 1;
6743 	}
6744 	s->matched_line = 0;
6745 
6746 done:
6747 	if (commit)
6748 		got_object_commit_close(commit);
6749 	if (fd != -1 && close(fd) == -1 && err == NULL)
6750 		err = got_error_from_errno("close");
6751 	if (blob)
6752 		got_object_blob_close(blob);
6753 	free(obj_id);
6754 	if (err)
6755 		stop_blame(blame);
6756 	return err;
6757 }
6758 
6759 static const struct got_error *
6760 open_blame_view(struct tog_view *view, char *path,
6761     struct got_object_id *commit_id, struct got_repository *repo)
6762 {
6763 	const struct got_error *err = NULL;
6764 	struct tog_blame_view_state *s = &view->state.blame;
6765 
6766 	STAILQ_INIT(&s->blamed_commits);
6767 
6768 	s->path = strdup(path);
6769 	if (s->path == NULL)
6770 		return got_error_from_errno("strdup");
6771 
6772 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6773 	if (err) {
6774 		free(s->path);
6775 		return err;
6776 	}
6777 
6778 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6779 	s->first_displayed_line = 1;
6780 	s->last_displayed_line = view->nlines;
6781 	s->selected_line = 1;
6782 	s->blame_complete = 0;
6783 	s->repo = repo;
6784 	s->commit_id = commit_id;
6785 	memset(&s->blame, 0, sizeof(s->blame));
6786 
6787 	STAILQ_INIT(&s->colors);
6788 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6789 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6790 		    get_color_value("TOG_COLOR_COMMIT"));
6791 		if (err)
6792 			return err;
6793 	}
6794 
6795 	view->show = show_blame_view;
6796 	view->input = input_blame_view;
6797 	view->reset = reset_blame_view;
6798 	view->close = close_blame_view;
6799 	view->search_start = search_start_blame_view;
6800 	view->search_setup = search_setup_blame_view;
6801 	view->search_next = search_next_view_match;
6802 
6803 	if (using_mock_io) {
6804 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6805 		int rc;
6806 
6807 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6808 		if (rc)
6809 			return got_error_set_errno(rc, "pthread_cond_init");
6810 	}
6811 
6812 	return run_blame(view);
6813 }
6814 
6815 static const struct got_error *
6816 close_blame_view(struct tog_view *view)
6817 {
6818 	const struct got_error *err = NULL;
6819 	struct tog_blame_view_state *s = &view->state.blame;
6820 
6821 	if (s->blame.thread)
6822 		err = stop_blame(&s->blame);
6823 
6824 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6825 		struct got_object_qid *blamed_commit;
6826 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6827 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6828 		got_object_qid_free(blamed_commit);
6829 	}
6830 
6831 	if (using_mock_io) {
6832 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6833 		int rc;
6834 
6835 		rc = pthread_cond_destroy(&bta->blame_complete);
6836 		if (rc && err == NULL)
6837 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6838 	}
6839 
6840 	free(s->path);
6841 	free_colors(&s->colors);
6842 	return err;
6843 }
6844 
6845 static const struct got_error *
6846 search_start_blame_view(struct tog_view *view)
6847 {
6848 	struct tog_blame_view_state *s = &view->state.blame;
6849 
6850 	s->matched_line = 0;
6851 	return NULL;
6852 }
6853 
6854 static void
6855 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6856     size_t *nlines, int **first, int **last, int **match, int **selected)
6857 {
6858 	struct tog_blame_view_state *s = &view->state.blame;
6859 
6860 	*f = s->blame.f;
6861 	*nlines = s->blame.nlines;
6862 	*line_offsets = s->blame.line_offsets;
6863 	*match = &s->matched_line;
6864 	*first = &s->first_displayed_line;
6865 	*last = &s->last_displayed_line;
6866 	*selected = &s->selected_line;
6867 }
6868 
6869 static const struct got_error *
6870 show_blame_view(struct tog_view *view)
6871 {
6872 	const struct got_error *err = NULL;
6873 	struct tog_blame_view_state *s = &view->state.blame;
6874 	int errcode;
6875 
6876 	if (s->blame.thread == NULL && !s->blame_complete) {
6877 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6878 		    &s->blame.thread_args);
6879 		if (errcode)
6880 			return got_error_set_errno(errcode, "pthread_create");
6881 
6882 		if (!using_mock_io)
6883 			halfdelay(1); /* fast refresh while annotating  */
6884 	}
6885 
6886 	if (s->blame_complete && !using_mock_io)
6887 		halfdelay(10); /* disable fast refresh */
6888 
6889 	err = draw_blame(view);
6890 
6891 	view_border(view);
6892 	return err;
6893 }
6894 
6895 static const struct got_error *
6896 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6897     struct got_repository *repo, struct got_object_id *id)
6898 {
6899 	struct tog_view		*log_view;
6900 	const struct got_error	*err = NULL;
6901 
6902 	*new_view = NULL;
6903 
6904 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6905 	if (log_view == NULL)
6906 		return got_error_from_errno("view_open");
6907 
6908 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6909 	if (err)
6910 		view_close(log_view);
6911 	else
6912 		*new_view = log_view;
6913 
6914 	return err;
6915 }
6916 
6917 static const struct got_error *
6918 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6919 {
6920 	const struct got_error *err = NULL, *thread_err = NULL;
6921 	struct tog_view *diff_view;
6922 	struct tog_blame_view_state *s = &view->state.blame;
6923 	int eos, nscroll, begin_y = 0, begin_x = 0;
6924 
6925 	eos = nscroll = view->nlines - 2;
6926 	if (view_is_hsplit_top(view))
6927 		--eos;  /* border */
6928 
6929 	switch (ch) {
6930 	case '0':
6931 	case '$':
6932 	case KEY_RIGHT:
6933 	case 'l':
6934 	case KEY_LEFT:
6935 	case 'h':
6936 		horizontal_scroll_input(view, ch);
6937 		break;
6938 	case 'q':
6939 		s->done = 1;
6940 		break;
6941 	case 'g':
6942 	case KEY_HOME:
6943 		s->selected_line = 1;
6944 		s->first_displayed_line = 1;
6945 		view->count = 0;
6946 		break;
6947 	case 'G':
6948 	case KEY_END:
6949 		if (s->blame.nlines < eos) {
6950 			s->selected_line = s->blame.nlines;
6951 			s->first_displayed_line = 1;
6952 		} else {
6953 			s->selected_line = eos;
6954 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6955 		}
6956 		view->count = 0;
6957 		break;
6958 	case 'k':
6959 	case KEY_UP:
6960 	case CTRL('p'):
6961 		if (s->selected_line > 1)
6962 			s->selected_line--;
6963 		else if (s->selected_line == 1 &&
6964 		    s->first_displayed_line > 1)
6965 			s->first_displayed_line--;
6966 		else
6967 			view->count = 0;
6968 		break;
6969 	case CTRL('u'):
6970 	case 'u':
6971 		nscroll /= 2;
6972 		/* FALL THROUGH */
6973 	case KEY_PPAGE:
6974 	case CTRL('b'):
6975 	case 'b':
6976 		if (s->first_displayed_line == 1) {
6977 			if (view->count > 1)
6978 				nscroll += nscroll;
6979 			s->selected_line = MAX(1, s->selected_line - nscroll);
6980 			view->count = 0;
6981 			break;
6982 		}
6983 		if (s->first_displayed_line > nscroll)
6984 			s->first_displayed_line -= nscroll;
6985 		else
6986 			s->first_displayed_line = 1;
6987 		break;
6988 	case 'j':
6989 	case KEY_DOWN:
6990 	case CTRL('n'):
6991 		if (s->selected_line < eos && s->first_displayed_line +
6992 		    s->selected_line <= s->blame.nlines)
6993 			s->selected_line++;
6994 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6995 			s->first_displayed_line++;
6996 		else
6997 			view->count = 0;
6998 		break;
6999 	case 'c':
7000 	case 'p': {
7001 		struct got_object_id *id = NULL;
7002 
7003 		view->count = 0;
7004 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7005 		    s->first_displayed_line, s->selected_line);
7006 		if (id == NULL)
7007 			break;
7008 		if (ch == 'p') {
7009 			struct got_commit_object *commit, *pcommit;
7010 			struct got_object_qid *pid;
7011 			struct got_object_id *blob_id = NULL;
7012 			int obj_type;
7013 			err = got_object_open_as_commit(&commit,
7014 			    s->repo, id);
7015 			if (err)
7016 				break;
7017 			pid = STAILQ_FIRST(
7018 			    got_object_commit_get_parent_ids(commit));
7019 			if (pid == NULL) {
7020 				got_object_commit_close(commit);
7021 				break;
7022 			}
7023 			/* Check if path history ends here. */
7024 			err = got_object_open_as_commit(&pcommit,
7025 			    s->repo, &pid->id);
7026 			if (err)
7027 				break;
7028 			err = got_object_id_by_path(&blob_id, s->repo,
7029 			    pcommit, s->path);
7030 			got_object_commit_close(pcommit);
7031 			if (err) {
7032 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7033 					err = NULL;
7034 				got_object_commit_close(commit);
7035 				break;
7036 			}
7037 			err = got_object_get_type(&obj_type, s->repo,
7038 			    blob_id);
7039 			free(blob_id);
7040 			/* Can't blame non-blob type objects. */
7041 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7042 				got_object_commit_close(commit);
7043 				break;
7044 			}
7045 			err = got_object_qid_alloc(&s->blamed_commit,
7046 			    &pid->id);
7047 			got_object_commit_close(commit);
7048 		} else {
7049 			if (got_object_id_cmp(id,
7050 			    &s->blamed_commit->id) == 0)
7051 				break;
7052 			err = got_object_qid_alloc(&s->blamed_commit,
7053 			    id);
7054 		}
7055 		if (err)
7056 			break;
7057 		s->done = 1;
7058 		thread_err = stop_blame(&s->blame);
7059 		s->done = 0;
7060 		if (thread_err)
7061 			break;
7062 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7063 		    s->blamed_commit, entry);
7064 		err = run_blame(view);
7065 		if (err)
7066 			break;
7067 		break;
7068 	}
7069 	case 'C': {
7070 		struct got_object_qid *first;
7071 
7072 		view->count = 0;
7073 		first = STAILQ_FIRST(&s->blamed_commits);
7074 		if (!got_object_id_cmp(&first->id, s->commit_id))
7075 			break;
7076 		s->done = 1;
7077 		thread_err = stop_blame(&s->blame);
7078 		s->done = 0;
7079 		if (thread_err)
7080 			break;
7081 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7082 		got_object_qid_free(s->blamed_commit);
7083 		s->blamed_commit =
7084 		    STAILQ_FIRST(&s->blamed_commits);
7085 		err = run_blame(view);
7086 		if (err)
7087 			break;
7088 		break;
7089 	}
7090 	case 'L':
7091 		view->count = 0;
7092 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7093 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7094 		if (s->id_to_log)
7095 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7096 		break;
7097 	case KEY_ENTER:
7098 	case '\r': {
7099 		struct got_object_id *id = NULL;
7100 		struct got_object_qid *pid;
7101 		struct got_commit_object *commit = NULL;
7102 
7103 		view->count = 0;
7104 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7105 		    s->first_displayed_line, s->selected_line);
7106 		if (id == NULL)
7107 			break;
7108 		err = got_object_open_as_commit(&commit, s->repo, id);
7109 		if (err)
7110 			break;
7111 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7112 		if (*new_view) {
7113 			/* traversed from diff view, release diff resources  */
7114 			err = close_diff_view(*new_view);
7115 			if (err)
7116 				break;
7117 			diff_view = *new_view;
7118 		} else {
7119 			if (view_is_parent_view(view))
7120 				view_get_split(view, &begin_y, &begin_x);
7121 
7122 			diff_view = view_open(0, 0, begin_y, begin_x,
7123 			    TOG_VIEW_DIFF);
7124 			if (diff_view == NULL) {
7125 				got_object_commit_close(commit);
7126 				err = got_error_from_errno("view_open");
7127 				break;
7128 			}
7129 		}
7130 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7131 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7132 		got_object_commit_close(commit);
7133 		if (err)
7134 			break;
7135 		s->last_diffed_line = s->first_displayed_line - 1 +
7136 		    s->selected_line;
7137 		if (*new_view)
7138 			break;	/* still open from active diff view */
7139 		if (view_is_parent_view(view) &&
7140 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7141 			err = view_init_hsplit(view, begin_y);
7142 			if (err)
7143 				break;
7144 		}
7145 
7146 		view->focussed = 0;
7147 		diff_view->focussed = 1;
7148 		diff_view->mode = view->mode;
7149 		diff_view->nlines = view->lines - begin_y;
7150 		if (view_is_parent_view(view)) {
7151 			view_transfer_size(diff_view, view);
7152 			err = view_close_child(view);
7153 			if (err)
7154 				break;
7155 			err = view_set_child(view, diff_view);
7156 			if (err)
7157 				break;
7158 			view->focus_child = 1;
7159 		} else
7160 			*new_view = diff_view;
7161 		if (err)
7162 			break;
7163 		break;
7164 	}
7165 	case CTRL('d'):
7166 	case 'd':
7167 		nscroll /= 2;
7168 		/* FALL THROUGH */
7169 	case KEY_NPAGE:
7170 	case CTRL('f'):
7171 	case 'f':
7172 	case ' ':
7173 		if (s->last_displayed_line >= s->blame.nlines &&
7174 		    s->selected_line >= MIN(s->blame.nlines,
7175 		    view->nlines - 2)) {
7176 			view->count = 0;
7177 			break;
7178 		}
7179 		if (s->last_displayed_line >= s->blame.nlines &&
7180 		    s->selected_line < view->nlines - 2) {
7181 			s->selected_line +=
7182 			    MIN(nscroll, s->last_displayed_line -
7183 			    s->first_displayed_line - s->selected_line + 1);
7184 		}
7185 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7186 			s->first_displayed_line += nscroll;
7187 		else
7188 			s->first_displayed_line =
7189 			    s->blame.nlines - (view->nlines - 3);
7190 		break;
7191 	case KEY_RESIZE:
7192 		if (s->selected_line > view->nlines - 2) {
7193 			s->selected_line = MIN(s->blame.nlines,
7194 			    view->nlines - 2);
7195 		}
7196 		break;
7197 	default:
7198 		view->count = 0;
7199 		break;
7200 	}
7201 	return thread_err ? thread_err : err;
7202 }
7203 
7204 static const struct got_error *
7205 reset_blame_view(struct tog_view *view)
7206 {
7207 	const struct got_error *err;
7208 	struct tog_blame_view_state *s = &view->state.blame;
7209 
7210 	view->count = 0;
7211 	s->done = 1;
7212 	err = stop_blame(&s->blame);
7213 	s->done = 0;
7214 	if (err)
7215 		return err;
7216 	return run_blame(view);
7217 }
7218 
7219 static const struct got_error *
7220 cmd_blame(int argc, char *argv[])
7221 {
7222 	const struct got_error *error;
7223 	struct got_repository *repo = NULL;
7224 	struct got_worktree *worktree = NULL;
7225 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7226 	char *link_target = NULL;
7227 	struct got_object_id *commit_id = NULL;
7228 	struct got_commit_object *commit = NULL;
7229 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7230 	int ch;
7231 	struct tog_view *view = NULL;
7232 	int *pack_fds = NULL;
7233 
7234 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7235 		switch (ch) {
7236 		case 'c':
7237 			commit_id_str = optarg;
7238 			break;
7239 		case 'r':
7240 			repo_path = realpath(optarg, NULL);
7241 			if (repo_path == NULL)
7242 				return got_error_from_errno2("realpath",
7243 				    optarg);
7244 			break;
7245 		default:
7246 			usage_blame();
7247 			/* NOTREACHED */
7248 		}
7249 	}
7250 
7251 	argc -= optind;
7252 	argv += optind;
7253 
7254 	if (argc != 1)
7255 		usage_blame();
7256 
7257 	error = got_repo_pack_fds_open(&pack_fds);
7258 	if (error != NULL)
7259 		goto done;
7260 
7261 	if (repo_path == NULL) {
7262 		cwd = getcwd(NULL, 0);
7263 		if (cwd == NULL)
7264 			return got_error_from_errno("getcwd");
7265 		error = got_worktree_open(&worktree, cwd, NULL);
7266 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7267 			goto done;
7268 		if (worktree)
7269 			repo_path =
7270 			    strdup(got_worktree_get_repo_path(worktree));
7271 		else
7272 			repo_path = strdup(cwd);
7273 		if (repo_path == NULL) {
7274 			error = got_error_from_errno("strdup");
7275 			goto done;
7276 		}
7277 	}
7278 
7279 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7280 	if (error != NULL)
7281 		goto done;
7282 
7283 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7284 	    worktree);
7285 	if (error)
7286 		goto done;
7287 
7288 	init_curses();
7289 
7290 	error = apply_unveil(got_repo_get_path(repo), NULL);
7291 	if (error)
7292 		goto done;
7293 
7294 	error = tog_load_refs(repo, 0);
7295 	if (error)
7296 		goto done;
7297 
7298 	if (commit_id_str == NULL) {
7299 		struct got_reference *head_ref;
7300 		error = got_ref_open(&head_ref, repo, worktree ?
7301 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7302 		if (error != NULL)
7303 			goto done;
7304 		error = got_ref_resolve(&commit_id, repo, head_ref);
7305 		got_ref_close(head_ref);
7306 	} else {
7307 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7308 		    repo, worktree);
7309 		if (error != NULL)
7310 			goto done;
7311 		if (keyword_idstr != NULL)
7312 			commit_id_str = keyword_idstr;
7313 
7314 		error = got_repo_match_object_id(&commit_id, NULL,
7315 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7316 	}
7317 	if (error != NULL)
7318 		goto done;
7319 
7320 	error = got_object_open_as_commit(&commit, repo, commit_id);
7321 	if (error)
7322 		goto done;
7323 
7324 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7325 	    commit, repo);
7326 	if (error)
7327 		goto done;
7328 
7329 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7330 	if (view == NULL) {
7331 		error = got_error_from_errno("view_open");
7332 		goto done;
7333 	}
7334 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7335 	    commit_id, repo);
7336 	if (error != NULL) {
7337 		if (view->close == NULL)
7338 			close_blame_view(view);
7339 		view_close(view);
7340 		goto done;
7341 	}
7342 
7343 	if (worktree) {
7344 		error = set_tog_base_commit(repo, worktree);
7345 		if (error != NULL)
7346 			goto done;
7347 
7348 		/* Release work tree lock. */
7349 		got_worktree_close(worktree);
7350 		worktree = NULL;
7351 	}
7352 
7353 	error = view_loop(view);
7354 
7355 done:
7356 	free(tog_base_commit.id);
7357 	free(repo_path);
7358 	free(in_repo_path);
7359 	free(link_target);
7360 	free(cwd);
7361 	free(commit_id);
7362 	free(keyword_idstr);
7363 	if (commit)
7364 		got_object_commit_close(commit);
7365 	if (worktree)
7366 		got_worktree_close(worktree);
7367 	if (repo) {
7368 		const struct got_error *close_err = got_repo_close(repo);
7369 		if (error == NULL)
7370 			error = close_err;
7371 	}
7372 	if (pack_fds) {
7373 		const struct got_error *pack_err =
7374 		    got_repo_pack_fds_close(pack_fds);
7375 		if (error == NULL)
7376 			error = pack_err;
7377 	}
7378 	tog_free_refs();
7379 	return error;
7380 }
7381 
7382 static const struct got_error *
7383 draw_tree_entries(struct tog_view *view, const char *parent_path)
7384 {
7385 	struct tog_tree_view_state *s = &view->state.tree;
7386 	const struct got_error *err = NULL;
7387 	struct got_tree_entry *te;
7388 	wchar_t *wline;
7389 	char *index = NULL;
7390 	struct tog_color *tc;
7391 	int width, n, nentries, scrollx, i = 1;
7392 	int limit = view->nlines;
7393 
7394 	s->ndisplayed = 0;
7395 	if (view_is_hsplit_top(view))
7396 		--limit;  /* border */
7397 
7398 	werase(view->window);
7399 
7400 	if (limit == 0)
7401 		return NULL;
7402 
7403 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7404 	    0, 0);
7405 	if (err)
7406 		return err;
7407 	if (view_needs_focus_indication(view))
7408 		wstandout(view->window);
7409 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7410 	if (tc)
7411 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7412 	waddwstr(view->window, wline);
7413 	free(wline);
7414 	wline = NULL;
7415 	while (width++ < view->ncols)
7416 		waddch(view->window, ' ');
7417 	if (tc)
7418 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7419 	if (view_needs_focus_indication(view))
7420 		wstandend(view->window);
7421 	if (--limit <= 0)
7422 		return NULL;
7423 
7424 	i += s->selected;
7425 	if (s->first_displayed_entry) {
7426 		i += got_tree_entry_get_index(s->first_displayed_entry);
7427 		if (s->tree != s->root)
7428 			++i;  /* account for ".." entry */
7429 	}
7430 	nentries = got_object_tree_get_nentries(s->tree);
7431 	if (asprintf(&index, "[%d/%d] %s",
7432 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7433 		return got_error_from_errno("asprintf");
7434 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7435 	free(index);
7436 	if (err)
7437 		return err;
7438 	waddwstr(view->window, wline);
7439 	free(wline);
7440 	wline = NULL;
7441 	if (width < view->ncols - 1)
7442 		waddch(view->window, '\n');
7443 	if (--limit <= 0)
7444 		return NULL;
7445 	waddch(view->window, '\n');
7446 	if (--limit <= 0)
7447 		return NULL;
7448 
7449 	if (s->first_displayed_entry == NULL) {
7450 		te = got_object_tree_get_first_entry(s->tree);
7451 		if (s->selected == 0) {
7452 			if (view->focussed)
7453 				wstandout(view->window);
7454 			s->selected_entry = NULL;
7455 		}
7456 		waddstr(view->window, "  ..\n");	/* parent directory */
7457 		if (s->selected == 0 && view->focussed)
7458 			wstandend(view->window);
7459 		s->ndisplayed++;
7460 		if (--limit <= 0)
7461 			return NULL;
7462 		n = 1;
7463 	} else {
7464 		n = 0;
7465 		te = s->first_displayed_entry;
7466 	}
7467 
7468 	view->maxx = 0;
7469 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7470 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7471 		const char *modestr = "";
7472 		mode_t mode;
7473 
7474 		te = got_object_tree_get_entry(s->tree, i);
7475 		mode = got_tree_entry_get_mode(te);
7476 
7477 		if (s->show_ids) {
7478 			err = got_object_id_str(&id_str,
7479 			    got_tree_entry_get_id(te));
7480 			if (err)
7481 				return got_error_from_errno(
7482 				    "got_object_id_str");
7483 		}
7484 		if (got_object_tree_entry_is_submodule(te))
7485 			modestr = "$";
7486 		else if (S_ISLNK(mode)) {
7487 			int i;
7488 
7489 			err = got_tree_entry_get_symlink_target(&link_target,
7490 			    te, s->repo);
7491 			if (err) {
7492 				free(id_str);
7493 				return err;
7494 			}
7495 			for (i = 0; link_target[i] != '\0'; i++) {
7496 				if (!isprint((unsigned char)link_target[i]))
7497 					link_target[i] = '?';
7498 			}
7499 			modestr = "@";
7500 		}
7501 		else if (S_ISDIR(mode))
7502 			modestr = "/";
7503 		else if (mode & S_IXUSR)
7504 			modestr = "*";
7505 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7506 		    got_tree_entry_get_name(te), modestr,
7507 		    link_target ? " -> ": "",
7508 		    link_target ? link_target : "") == -1) {
7509 			free(id_str);
7510 			free(link_target);
7511 			return got_error_from_errno("asprintf");
7512 		}
7513 		free(id_str);
7514 		free(link_target);
7515 
7516 		/* use full line width to determine view->maxx */
7517 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7518 		if (err) {
7519 			free(line);
7520 			break;
7521 		}
7522 		view->maxx = MAX(view->maxx, width);
7523 		free(wline);
7524 		wline = NULL;
7525 
7526 		err = format_line(&wline, &width, &scrollx, line, view->x,
7527 		    view->ncols, 0, 0);
7528 		if (err) {
7529 			free(line);
7530 			break;
7531 		}
7532 		if (n == s->selected) {
7533 			if (view->focussed)
7534 				wstandout(view->window);
7535 			s->selected_entry = te;
7536 		}
7537 		tc = match_color(&s->colors, line);
7538 		if (tc)
7539 			wattr_on(view->window,
7540 			    COLOR_PAIR(tc->colorpair), NULL);
7541 		waddwstr(view->window, &wline[scrollx]);
7542 		if (tc)
7543 			wattr_off(view->window,
7544 			    COLOR_PAIR(tc->colorpair), NULL);
7545 		if (width < view->ncols)
7546 			waddch(view->window, '\n');
7547 		if (n == s->selected && view->focussed)
7548 			wstandend(view->window);
7549 		free(line);
7550 		free(wline);
7551 		wline = NULL;
7552 		n++;
7553 		s->ndisplayed++;
7554 		s->last_displayed_entry = te;
7555 		if (--limit <= 0)
7556 			break;
7557 	}
7558 
7559 	return err;
7560 }
7561 
7562 static void
7563 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7564 {
7565 	struct got_tree_entry *te;
7566 	int isroot = s->tree == s->root;
7567 	int i = 0;
7568 
7569 	if (s->first_displayed_entry == NULL)
7570 		return;
7571 
7572 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7573 	while (i++ < maxscroll) {
7574 		if (te == NULL) {
7575 			if (!isroot)
7576 				s->first_displayed_entry = NULL;
7577 			break;
7578 		}
7579 		s->first_displayed_entry = te;
7580 		te = got_tree_entry_get_prev(s->tree, te);
7581 	}
7582 }
7583 
7584 static const struct got_error *
7585 tree_scroll_down(struct tog_view *view, int maxscroll)
7586 {
7587 	struct tog_tree_view_state *s = &view->state.tree;
7588 	struct got_tree_entry *next, *last;
7589 	int n = 0;
7590 
7591 	if (s->first_displayed_entry)
7592 		next = got_tree_entry_get_next(s->tree,
7593 		    s->first_displayed_entry);
7594 	else
7595 		next = got_object_tree_get_first_entry(s->tree);
7596 
7597 	last = s->last_displayed_entry;
7598 	while (next && n++ < maxscroll) {
7599 		if (last) {
7600 			s->last_displayed_entry = last;
7601 			last = got_tree_entry_get_next(s->tree, last);
7602 		}
7603 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7604 			s->first_displayed_entry = next;
7605 			next = got_tree_entry_get_next(s->tree, next);
7606 		}
7607 	}
7608 
7609 	return NULL;
7610 }
7611 
7612 static const struct got_error *
7613 tree_entry_path(char **path, struct tog_parent_trees *parents,
7614     struct got_tree_entry *te)
7615 {
7616 	const struct got_error *err = NULL;
7617 	struct tog_parent_tree *pt;
7618 	size_t len = 2; /* for leading slash and NUL */
7619 
7620 	TAILQ_FOREACH(pt, parents, entry)
7621 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7622 		    + 1 /* slash */;
7623 	if (te)
7624 		len += strlen(got_tree_entry_get_name(te));
7625 
7626 	*path = calloc(1, len);
7627 	if (path == NULL)
7628 		return got_error_from_errno("calloc");
7629 
7630 	(*path)[0] = '/';
7631 	pt = TAILQ_LAST(parents, tog_parent_trees);
7632 	while (pt) {
7633 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7634 		if (strlcat(*path, name, len) >= len) {
7635 			err = got_error(GOT_ERR_NO_SPACE);
7636 			goto done;
7637 		}
7638 		if (strlcat(*path, "/", len) >= len) {
7639 			err = got_error(GOT_ERR_NO_SPACE);
7640 			goto done;
7641 		}
7642 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7643 	}
7644 	if (te) {
7645 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7646 			err = got_error(GOT_ERR_NO_SPACE);
7647 			goto done;
7648 		}
7649 	}
7650 done:
7651 	if (err) {
7652 		free(*path);
7653 		*path = NULL;
7654 	}
7655 	return err;
7656 }
7657 
7658 static const struct got_error *
7659 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7660     struct got_tree_entry *te, struct tog_parent_trees *parents,
7661     struct got_object_id *commit_id, struct got_repository *repo)
7662 {
7663 	const struct got_error *err = NULL;
7664 	char *path;
7665 	struct tog_view *blame_view;
7666 
7667 	*new_view = NULL;
7668 
7669 	err = tree_entry_path(&path, parents, te);
7670 	if (err)
7671 		return err;
7672 
7673 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7674 	if (blame_view == NULL) {
7675 		err = got_error_from_errno("view_open");
7676 		goto done;
7677 	}
7678 
7679 	err = open_blame_view(blame_view, path, commit_id, repo);
7680 	if (err) {
7681 		if (err->code == GOT_ERR_CANCELLED)
7682 			err = NULL;
7683 		view_close(blame_view);
7684 	} else
7685 		*new_view = blame_view;
7686 done:
7687 	free(path);
7688 	return err;
7689 }
7690 
7691 static const struct got_error *
7692 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7693     struct tog_tree_view_state *s)
7694 {
7695 	struct tog_view *log_view;
7696 	const struct got_error *err = NULL;
7697 	char *path;
7698 
7699 	*new_view = NULL;
7700 
7701 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7702 	if (log_view == NULL)
7703 		return got_error_from_errno("view_open");
7704 
7705 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7706 	if (err)
7707 		return err;
7708 
7709 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7710 	    path, 0, NULL);
7711 	if (err)
7712 		view_close(log_view);
7713 	else
7714 		*new_view = log_view;
7715 	free(path);
7716 	return err;
7717 }
7718 
7719 static const struct got_error *
7720 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7721     const char *head_ref_name, struct got_repository *repo)
7722 {
7723 	const struct got_error *err = NULL;
7724 	char *commit_id_str = NULL;
7725 	struct tog_tree_view_state *s = &view->state.tree;
7726 	struct got_commit_object *commit = NULL;
7727 
7728 	TAILQ_INIT(&s->parents);
7729 	STAILQ_INIT(&s->colors);
7730 
7731 	s->commit_id = got_object_id_dup(commit_id);
7732 	if (s->commit_id == NULL) {
7733 		err = got_error_from_errno("got_object_id_dup");
7734 		goto done;
7735 	}
7736 
7737 	err = got_object_open_as_commit(&commit, repo, commit_id);
7738 	if (err)
7739 		goto done;
7740 
7741 	/*
7742 	 * The root is opened here and will be closed when the view is closed.
7743 	 * Any visited subtrees and their path-wise parents are opened and
7744 	 * closed on demand.
7745 	 */
7746 	err = got_object_open_as_tree(&s->root, repo,
7747 	    got_object_commit_get_tree_id(commit));
7748 	if (err)
7749 		goto done;
7750 	s->tree = s->root;
7751 
7752 	err = got_object_id_str(&commit_id_str, commit_id);
7753 	if (err != NULL)
7754 		goto done;
7755 
7756 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7757 		err = got_error_from_errno("asprintf");
7758 		goto done;
7759 	}
7760 
7761 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7762 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7763 	if (head_ref_name) {
7764 		s->head_ref_name = strdup(head_ref_name);
7765 		if (s->head_ref_name == NULL) {
7766 			err = got_error_from_errno("strdup");
7767 			goto done;
7768 		}
7769 	}
7770 	s->repo = repo;
7771 
7772 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7773 		err = add_color(&s->colors, "\\$$",
7774 		    TOG_COLOR_TREE_SUBMODULE,
7775 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7776 		if (err)
7777 			goto done;
7778 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7779 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7780 		if (err)
7781 			goto done;
7782 		err = add_color(&s->colors, "/$",
7783 		    TOG_COLOR_TREE_DIRECTORY,
7784 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7785 		if (err)
7786 			goto done;
7787 
7788 		err = add_color(&s->colors, "\\*$",
7789 		    TOG_COLOR_TREE_EXECUTABLE,
7790 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7791 		if (err)
7792 			goto done;
7793 
7794 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7795 		    get_color_value("TOG_COLOR_COMMIT"));
7796 		if (err)
7797 			goto done;
7798 	}
7799 
7800 	view->show = show_tree_view;
7801 	view->input = input_tree_view;
7802 	view->close = close_tree_view;
7803 	view->search_start = search_start_tree_view;
7804 	view->search_next = search_next_tree_view;
7805 done:
7806 	free(commit_id_str);
7807 	if (commit)
7808 		got_object_commit_close(commit);
7809 	if (err) {
7810 		if (view->close == NULL)
7811 			close_tree_view(view);
7812 		view_close(view);
7813 	}
7814 	return err;
7815 }
7816 
7817 static const struct got_error *
7818 close_tree_view(struct tog_view *view)
7819 {
7820 	struct tog_tree_view_state *s = &view->state.tree;
7821 
7822 	free_colors(&s->colors);
7823 	free(s->tree_label);
7824 	s->tree_label = NULL;
7825 	free(s->commit_id);
7826 	s->commit_id = NULL;
7827 	free(s->head_ref_name);
7828 	s->head_ref_name = NULL;
7829 	while (!TAILQ_EMPTY(&s->parents)) {
7830 		struct tog_parent_tree *parent;
7831 		parent = TAILQ_FIRST(&s->parents);
7832 		TAILQ_REMOVE(&s->parents, parent, entry);
7833 		if (parent->tree != s->root)
7834 			got_object_tree_close(parent->tree);
7835 		free(parent);
7836 
7837 	}
7838 	if (s->tree != NULL && s->tree != s->root)
7839 		got_object_tree_close(s->tree);
7840 	if (s->root)
7841 		got_object_tree_close(s->root);
7842 	return NULL;
7843 }
7844 
7845 static const struct got_error *
7846 search_start_tree_view(struct tog_view *view)
7847 {
7848 	struct tog_tree_view_state *s = &view->state.tree;
7849 
7850 	s->matched_entry = NULL;
7851 	return NULL;
7852 }
7853 
7854 static int
7855 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7856 {
7857 	regmatch_t regmatch;
7858 
7859 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7860 	    0) == 0;
7861 }
7862 
7863 static const struct got_error *
7864 search_next_tree_view(struct tog_view *view)
7865 {
7866 	struct tog_tree_view_state *s = &view->state.tree;
7867 	struct got_tree_entry *te = NULL;
7868 
7869 	if (!view->searching) {
7870 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7871 		return NULL;
7872 	}
7873 
7874 	if (s->matched_entry) {
7875 		if (view->searching == TOG_SEARCH_FORWARD) {
7876 			if (s->selected_entry)
7877 				te = got_tree_entry_get_next(s->tree,
7878 				    s->selected_entry);
7879 			else
7880 				te = got_object_tree_get_first_entry(s->tree);
7881 		} else {
7882 			if (s->selected_entry == NULL)
7883 				te = got_object_tree_get_last_entry(s->tree);
7884 			else
7885 				te = got_tree_entry_get_prev(s->tree,
7886 				    s->selected_entry);
7887 		}
7888 	} else {
7889 		if (s->selected_entry)
7890 			te = s->selected_entry;
7891 		else if (view->searching == TOG_SEARCH_FORWARD)
7892 			te = got_object_tree_get_first_entry(s->tree);
7893 		else
7894 			te = got_object_tree_get_last_entry(s->tree);
7895 	}
7896 
7897 	while (1) {
7898 		if (te == NULL) {
7899 			if (s->matched_entry == NULL) {
7900 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7901 				return NULL;
7902 			}
7903 			if (view->searching == TOG_SEARCH_FORWARD)
7904 				te = got_object_tree_get_first_entry(s->tree);
7905 			else
7906 				te = got_object_tree_get_last_entry(s->tree);
7907 		}
7908 
7909 		if (match_tree_entry(te, &view->regex)) {
7910 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7911 			s->matched_entry = te;
7912 			break;
7913 		}
7914 
7915 		if (view->searching == TOG_SEARCH_FORWARD)
7916 			te = got_tree_entry_get_next(s->tree, te);
7917 		else
7918 			te = got_tree_entry_get_prev(s->tree, te);
7919 	}
7920 
7921 	if (s->matched_entry) {
7922 		s->first_displayed_entry = s->matched_entry;
7923 		s->selected = 0;
7924 	}
7925 
7926 	return NULL;
7927 }
7928 
7929 static const struct got_error *
7930 show_tree_view(struct tog_view *view)
7931 {
7932 	const struct got_error *err = NULL;
7933 	struct tog_tree_view_state *s = &view->state.tree;
7934 	char *parent_path;
7935 
7936 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7937 	if (err)
7938 		return err;
7939 
7940 	err = draw_tree_entries(view, parent_path);
7941 	free(parent_path);
7942 
7943 	view_border(view);
7944 	return err;
7945 }
7946 
7947 static const struct got_error *
7948 tree_goto_line(struct tog_view *view, int nlines)
7949 {
7950 	const struct got_error		 *err = NULL;
7951 	struct tog_tree_view_state	 *s = &view->state.tree;
7952 	struct got_tree_entry		**fte, **lte, **ste;
7953 	int				  g, last, first = 1, i = 1;
7954 	int				  root = s->tree == s->root;
7955 	int				  off = root ? 1 : 2;
7956 
7957 	g = view->gline;
7958 	view->gline = 0;
7959 
7960 	if (g == 0)
7961 		g = 1;
7962 	else if (g > got_object_tree_get_nentries(s->tree))
7963 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7964 
7965 	fte = &s->first_displayed_entry;
7966 	lte = &s->last_displayed_entry;
7967 	ste = &s->selected_entry;
7968 
7969 	if (*fte != NULL) {
7970 		first = got_tree_entry_get_index(*fte);
7971 		first += off;  /* account for ".." */
7972 	}
7973 	last = got_tree_entry_get_index(*lte);
7974 	last += off;
7975 
7976 	if (g >= first && g <= last && g - first < nlines) {
7977 		s->selected = g - first;
7978 		return NULL;	/* gline is on the current page */
7979 	}
7980 
7981 	if (*ste != NULL) {
7982 		i = got_tree_entry_get_index(*ste);
7983 		i += off;
7984 	}
7985 
7986 	if (i < g) {
7987 		err = tree_scroll_down(view, g - i);
7988 		if (err)
7989 			return err;
7990 		if (got_tree_entry_get_index(*lte) >=
7991 		    got_object_tree_get_nentries(s->tree) - 1 &&
7992 		    first + s->selected < g &&
7993 		    s->selected < s->ndisplayed - 1) {
7994 			first = got_tree_entry_get_index(*fte);
7995 			first += off;
7996 			s->selected = g - first;
7997 		}
7998 	} else if (i > g)
7999 		tree_scroll_up(s, i - g);
8000 
8001 	if (g < nlines &&
8002 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
8003 		s->selected = g - 1;
8004 
8005 	return NULL;
8006 }
8007 
8008 static const struct got_error *
8009 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
8010 {
8011 	const struct got_error *err = NULL;
8012 	struct tog_tree_view_state *s = &view->state.tree;
8013 	struct got_tree_entry *te;
8014 	int n, nscroll = view->nlines - 3;
8015 
8016 	if (view->gline)
8017 		return tree_goto_line(view, nscroll);
8018 
8019 	switch (ch) {
8020 	case '0':
8021 	case '$':
8022 	case KEY_RIGHT:
8023 	case 'l':
8024 	case KEY_LEFT:
8025 	case 'h':
8026 		horizontal_scroll_input(view, ch);
8027 		break;
8028 	case 'i':
8029 		s->show_ids = !s->show_ids;
8030 		view->count = 0;
8031 		break;
8032 	case 'L':
8033 		view->count = 0;
8034 		if (!s->selected_entry)
8035 			break;
8036 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8037 		break;
8038 	case 'R':
8039 		view->count = 0;
8040 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8041 		break;
8042 	case 'g':
8043 	case '=':
8044 	case KEY_HOME:
8045 		s->selected = 0;
8046 		view->count = 0;
8047 		if (s->tree == s->root)
8048 			s->first_displayed_entry =
8049 			    got_object_tree_get_first_entry(s->tree);
8050 		else
8051 			s->first_displayed_entry = NULL;
8052 		break;
8053 	case 'G':
8054 	case '*':
8055 	case KEY_END: {
8056 		int eos = view->nlines - 3;
8057 
8058 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8059 			--eos;  /* border */
8060 		s->selected = 0;
8061 		view->count = 0;
8062 		te = got_object_tree_get_last_entry(s->tree);
8063 		for (n = 0; n < eos; n++) {
8064 			if (te == NULL) {
8065 				if (s->tree != s->root) {
8066 					s->first_displayed_entry = NULL;
8067 					n++;
8068 				}
8069 				break;
8070 			}
8071 			s->first_displayed_entry = te;
8072 			te = got_tree_entry_get_prev(s->tree, te);
8073 		}
8074 		if (n > 0)
8075 			s->selected = n - 1;
8076 		break;
8077 	}
8078 	case 'k':
8079 	case KEY_UP:
8080 	case CTRL('p'):
8081 		if (s->selected > 0) {
8082 			s->selected--;
8083 			break;
8084 		}
8085 		tree_scroll_up(s, 1);
8086 		if (s->selected_entry == NULL ||
8087 		    (s->tree == s->root && s->selected_entry ==
8088 		     got_object_tree_get_first_entry(s->tree)))
8089 			view->count = 0;
8090 		break;
8091 	case CTRL('u'):
8092 	case 'u':
8093 		nscroll /= 2;
8094 		/* FALL THROUGH */
8095 	case KEY_PPAGE:
8096 	case CTRL('b'):
8097 	case 'b':
8098 		if (s->tree == s->root) {
8099 			if (got_object_tree_get_first_entry(s->tree) ==
8100 			    s->first_displayed_entry)
8101 				s->selected -= MIN(s->selected, nscroll);
8102 		} else {
8103 			if (s->first_displayed_entry == NULL)
8104 				s->selected -= MIN(s->selected, nscroll);
8105 		}
8106 		tree_scroll_up(s, MAX(0, nscroll));
8107 		if (s->selected_entry == NULL ||
8108 		    (s->tree == s->root && s->selected_entry ==
8109 		     got_object_tree_get_first_entry(s->tree)))
8110 			view->count = 0;
8111 		break;
8112 	case 'j':
8113 	case KEY_DOWN:
8114 	case CTRL('n'):
8115 		if (s->selected < s->ndisplayed - 1) {
8116 			s->selected++;
8117 			break;
8118 		}
8119 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8120 		    == NULL) {
8121 			/* can't scroll any further */
8122 			view->count = 0;
8123 			break;
8124 		}
8125 		tree_scroll_down(view, 1);
8126 		break;
8127 	case CTRL('d'):
8128 	case 'd':
8129 		nscroll /= 2;
8130 		/* FALL THROUGH */
8131 	case KEY_NPAGE:
8132 	case CTRL('f'):
8133 	case 'f':
8134 	case ' ':
8135 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8136 		    == NULL) {
8137 			/* can't scroll any further; move cursor down */
8138 			if (s->selected < s->ndisplayed - 1)
8139 				s->selected += MIN(nscroll,
8140 				    s->ndisplayed - s->selected - 1);
8141 			else
8142 				view->count = 0;
8143 			break;
8144 		}
8145 		tree_scroll_down(view, nscroll);
8146 		break;
8147 	case KEY_ENTER:
8148 	case '\r':
8149 	case KEY_BACKSPACE:
8150 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8151 			struct tog_parent_tree *parent;
8152 			/* user selected '..' */
8153 			if (s->tree == s->root) {
8154 				view->count = 0;
8155 				break;
8156 			}
8157 			parent = TAILQ_FIRST(&s->parents);
8158 			TAILQ_REMOVE(&s->parents, parent,
8159 			    entry);
8160 			got_object_tree_close(s->tree);
8161 			s->tree = parent->tree;
8162 			s->first_displayed_entry =
8163 			    parent->first_displayed_entry;
8164 			s->selected_entry =
8165 			    parent->selected_entry;
8166 			s->selected = parent->selected;
8167 			if (s->selected > view->nlines - 3) {
8168 				err = offset_selection_down(view);
8169 				if (err)
8170 					break;
8171 			}
8172 			free(parent);
8173 		} else if (S_ISDIR(got_tree_entry_get_mode(
8174 		    s->selected_entry))) {
8175 			struct got_tree_object *subtree;
8176 			view->count = 0;
8177 			err = got_object_open_as_tree(&subtree, s->repo,
8178 			    got_tree_entry_get_id(s->selected_entry));
8179 			if (err)
8180 				break;
8181 			err = tree_view_visit_subtree(s, subtree);
8182 			if (err) {
8183 				got_object_tree_close(subtree);
8184 				break;
8185 			}
8186 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8187 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8188 		break;
8189 	case KEY_RESIZE:
8190 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8191 			s->selected = view->nlines - 4;
8192 		view->count = 0;
8193 		break;
8194 	default:
8195 		view->count = 0;
8196 		break;
8197 	}
8198 
8199 	return err;
8200 }
8201 
8202 __dead static void
8203 usage_tree(void)
8204 {
8205 	endwin();
8206 	fprintf(stderr,
8207 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8208 	    getprogname());
8209 	exit(1);
8210 }
8211 
8212 static const struct got_error *
8213 cmd_tree(int argc, char *argv[])
8214 {
8215 	const struct got_error *error;
8216 	struct got_repository *repo = NULL;
8217 	struct got_worktree *worktree = NULL;
8218 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8219 	struct got_object_id *commit_id = NULL;
8220 	struct got_commit_object *commit = NULL;
8221 	const char *commit_id_arg = NULL;
8222 	char *keyword_idstr = NULL, *label = NULL;
8223 	struct got_reference *ref = NULL;
8224 	const char *head_ref_name = NULL;
8225 	int ch;
8226 	struct tog_view *view;
8227 	int *pack_fds = NULL;
8228 
8229 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8230 		switch (ch) {
8231 		case 'c':
8232 			commit_id_arg = optarg;
8233 			break;
8234 		case 'r':
8235 			repo_path = realpath(optarg, NULL);
8236 			if (repo_path == NULL)
8237 				return got_error_from_errno2("realpath",
8238 				    optarg);
8239 			break;
8240 		default:
8241 			usage_tree();
8242 			/* NOTREACHED */
8243 		}
8244 	}
8245 
8246 	argc -= optind;
8247 	argv += optind;
8248 
8249 	if (argc > 1)
8250 		usage_tree();
8251 
8252 	error = got_repo_pack_fds_open(&pack_fds);
8253 	if (error != NULL)
8254 		goto done;
8255 
8256 	if (repo_path == NULL) {
8257 		cwd = getcwd(NULL, 0);
8258 		if (cwd == NULL)
8259 			return got_error_from_errno("getcwd");
8260 		error = got_worktree_open(&worktree, cwd, NULL);
8261 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8262 			goto done;
8263 		if (worktree)
8264 			repo_path =
8265 			    strdup(got_worktree_get_repo_path(worktree));
8266 		else
8267 			repo_path = strdup(cwd);
8268 		if (repo_path == NULL) {
8269 			error = got_error_from_errno("strdup");
8270 			goto done;
8271 		}
8272 	}
8273 
8274 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8275 	if (error != NULL)
8276 		goto done;
8277 
8278 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8279 	    repo, worktree);
8280 	if (error)
8281 		goto done;
8282 
8283 	init_curses();
8284 
8285 	error = apply_unveil(got_repo_get_path(repo), NULL);
8286 	if (error)
8287 		goto done;
8288 
8289 	error = tog_load_refs(repo, 0);
8290 	if (error)
8291 		goto done;
8292 
8293 	if (commit_id_arg == NULL) {
8294 		error = got_repo_match_object_id(&commit_id, &label,
8295 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8296 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8297 		if (error)
8298 			goto done;
8299 		head_ref_name = label;
8300 	} else {
8301 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8302 		    repo, worktree);
8303 		if (error != NULL)
8304 			goto done;
8305 		if (keyword_idstr != NULL)
8306 			commit_id_arg = keyword_idstr;
8307 
8308 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8309 		if (error == NULL)
8310 			head_ref_name = got_ref_get_name(ref);
8311 		else if (error->code != GOT_ERR_NOT_REF)
8312 			goto done;
8313 		error = got_repo_match_object_id(&commit_id, NULL,
8314 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8315 		if (error)
8316 			goto done;
8317 	}
8318 
8319 	error = got_object_open_as_commit(&commit, repo, commit_id);
8320 	if (error)
8321 		goto done;
8322 
8323 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8324 	if (view == NULL) {
8325 		error = got_error_from_errno("view_open");
8326 		goto done;
8327 	}
8328 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8329 	if (error)
8330 		goto done;
8331 	if (!got_path_is_root_dir(in_repo_path)) {
8332 		error = tree_view_walk_path(&view->state.tree, commit,
8333 		    in_repo_path);
8334 		if (error)
8335 			goto done;
8336 	}
8337 
8338 	if (worktree) {
8339 		error = set_tog_base_commit(repo, worktree);
8340 		if (error != NULL)
8341 			goto done;
8342 
8343 		/* Release work tree lock. */
8344 		got_worktree_close(worktree);
8345 		worktree = NULL;
8346 	}
8347 
8348 	error = view_loop(view);
8349 
8350 done:
8351 	free(tog_base_commit.id);
8352 	free(keyword_idstr);
8353 	free(repo_path);
8354 	free(cwd);
8355 	free(commit_id);
8356 	free(label);
8357 	if (ref)
8358 		got_ref_close(ref);
8359 	if (worktree != NULL)
8360 		got_worktree_close(worktree);
8361 	if (repo) {
8362 		const struct got_error *close_err = got_repo_close(repo);
8363 		if (error == NULL)
8364 			error = close_err;
8365 	}
8366 	if (pack_fds) {
8367 		const struct got_error *pack_err =
8368 		    got_repo_pack_fds_close(pack_fds);
8369 		if (error == NULL)
8370 			error = pack_err;
8371 	}
8372 	tog_free_refs();
8373 	return error;
8374 }
8375 
8376 static const struct got_error *
8377 ref_view_load_refs(struct tog_ref_view_state *s)
8378 {
8379 	struct got_reflist_entry *sre;
8380 	struct tog_reflist_entry *re;
8381 
8382 	s->nrefs = 0;
8383 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8384 		if (strncmp(got_ref_get_name(sre->ref),
8385 		    "refs/got/", 9) == 0 &&
8386 		    strncmp(got_ref_get_name(sre->ref),
8387 		    "refs/got/backup/", 16) != 0)
8388 			continue;
8389 
8390 		re = malloc(sizeof(*re));
8391 		if (re == NULL)
8392 			return got_error_from_errno("malloc");
8393 
8394 		re->ref = got_ref_dup(sre->ref);
8395 		if (re->ref == NULL)
8396 			return got_error_from_errno("got_ref_dup");
8397 		re->idx = s->nrefs++;
8398 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8399 	}
8400 
8401 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8402 	return NULL;
8403 }
8404 
8405 static void
8406 ref_view_free_refs(struct tog_ref_view_state *s)
8407 {
8408 	struct tog_reflist_entry *re;
8409 
8410 	while (!TAILQ_EMPTY(&s->refs)) {
8411 		re = TAILQ_FIRST(&s->refs);
8412 		TAILQ_REMOVE(&s->refs, re, entry);
8413 		got_ref_close(re->ref);
8414 		free(re);
8415 	}
8416 }
8417 
8418 static const struct got_error *
8419 open_ref_view(struct tog_view *view, struct got_repository *repo)
8420 {
8421 	const struct got_error *err = NULL;
8422 	struct tog_ref_view_state *s = &view->state.ref;
8423 
8424 	s->selected_entry = 0;
8425 	s->repo = repo;
8426 
8427 	TAILQ_INIT(&s->refs);
8428 	STAILQ_INIT(&s->colors);
8429 
8430 	err = ref_view_load_refs(s);
8431 	if (err)
8432 		goto done;
8433 
8434 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8435 		err = add_color(&s->colors, "^refs/heads/",
8436 		    TOG_COLOR_REFS_HEADS,
8437 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8438 		if (err)
8439 			goto done;
8440 
8441 		err = add_color(&s->colors, "^refs/tags/",
8442 		    TOG_COLOR_REFS_TAGS,
8443 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8444 		if (err)
8445 			goto done;
8446 
8447 		err = add_color(&s->colors, "^refs/remotes/",
8448 		    TOG_COLOR_REFS_REMOTES,
8449 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8450 		if (err)
8451 			goto done;
8452 
8453 		err = add_color(&s->colors, "^refs/got/backup/",
8454 		    TOG_COLOR_REFS_BACKUP,
8455 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8456 		if (err)
8457 			goto done;
8458 	}
8459 
8460 	view->show = show_ref_view;
8461 	view->input = input_ref_view;
8462 	view->close = close_ref_view;
8463 	view->search_start = search_start_ref_view;
8464 	view->search_next = search_next_ref_view;
8465 done:
8466 	if (err) {
8467 		if (view->close == NULL)
8468 			close_ref_view(view);
8469 		view_close(view);
8470 	}
8471 	return err;
8472 }
8473 
8474 static const struct got_error *
8475 close_ref_view(struct tog_view *view)
8476 {
8477 	struct tog_ref_view_state *s = &view->state.ref;
8478 
8479 	ref_view_free_refs(s);
8480 	free_colors(&s->colors);
8481 
8482 	return NULL;
8483 }
8484 
8485 static const struct got_error *
8486 resolve_reflist_entry(struct got_object_id **commit_id,
8487     struct tog_reflist_entry *re, struct got_repository *repo)
8488 {
8489 	const struct got_error *err = NULL;
8490 	struct got_object_id *obj_id;
8491 	struct got_tag_object *tag = NULL;
8492 	int obj_type;
8493 
8494 	*commit_id = NULL;
8495 
8496 	err = got_ref_resolve(&obj_id, repo, re->ref);
8497 	if (err)
8498 		return err;
8499 
8500 	err = got_object_get_type(&obj_type, repo, obj_id);
8501 	if (err)
8502 		goto done;
8503 
8504 	switch (obj_type) {
8505 	case GOT_OBJ_TYPE_COMMIT:
8506 		*commit_id = obj_id;
8507 		break;
8508 	case GOT_OBJ_TYPE_TAG:
8509 		err = got_object_open_as_tag(&tag, repo, obj_id);
8510 		if (err)
8511 			goto done;
8512 		free(obj_id);
8513 		err = got_object_get_type(&obj_type, repo,
8514 		    got_object_tag_get_object_id(tag));
8515 		if (err)
8516 			goto done;
8517 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8518 			err = got_error(GOT_ERR_OBJ_TYPE);
8519 			goto done;
8520 		}
8521 		*commit_id = got_object_id_dup(
8522 		    got_object_tag_get_object_id(tag));
8523 		if (*commit_id == NULL) {
8524 			err = got_error_from_errno("got_object_id_dup");
8525 			goto done;
8526 		}
8527 		break;
8528 	default:
8529 		err = got_error(GOT_ERR_OBJ_TYPE);
8530 		break;
8531 	}
8532 
8533 done:
8534 	if (tag)
8535 		got_object_tag_close(tag);
8536 	if (err) {
8537 		free(*commit_id);
8538 		*commit_id = NULL;
8539 	}
8540 	return err;
8541 }
8542 
8543 static const struct got_error *
8544 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8545     struct tog_reflist_entry *re, struct got_repository *repo)
8546 {
8547 	struct tog_view *log_view;
8548 	const struct got_error *err = NULL;
8549 	struct got_object_id *commit_id = NULL;
8550 
8551 	*new_view = NULL;
8552 
8553 	err = resolve_reflist_entry(&commit_id, re, repo);
8554 	if (err) {
8555 		if (err->code != GOT_ERR_OBJ_TYPE)
8556 			return err;
8557 		else
8558 			return NULL;
8559 	}
8560 
8561 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8562 	if (log_view == NULL) {
8563 		err = got_error_from_errno("view_open");
8564 		goto done;
8565 	}
8566 
8567 	err = open_log_view(log_view, commit_id, repo,
8568 	    got_ref_get_name(re->ref), "", 0, NULL);
8569 done:
8570 	if (err)
8571 		view_close(log_view);
8572 	else
8573 		*new_view = log_view;
8574 	free(commit_id);
8575 	return err;
8576 }
8577 
8578 static void
8579 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8580 {
8581 	struct tog_reflist_entry *re;
8582 	int i = 0;
8583 
8584 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8585 		return;
8586 
8587 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8588 	while (i++ < maxscroll) {
8589 		if (re == NULL)
8590 			break;
8591 		s->first_displayed_entry = re;
8592 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8593 	}
8594 }
8595 
8596 static const struct got_error *
8597 ref_scroll_down(struct tog_view *view, int maxscroll)
8598 {
8599 	struct tog_ref_view_state *s = &view->state.ref;
8600 	struct tog_reflist_entry *next, *last;
8601 	int n = 0;
8602 
8603 	if (s->first_displayed_entry)
8604 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8605 	else
8606 		next = TAILQ_FIRST(&s->refs);
8607 
8608 	last = s->last_displayed_entry;
8609 	while (next && n++ < maxscroll) {
8610 		if (last) {
8611 			s->last_displayed_entry = last;
8612 			last = TAILQ_NEXT(last, entry);
8613 		}
8614 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8615 			s->first_displayed_entry = next;
8616 			next = TAILQ_NEXT(next, entry);
8617 		}
8618 	}
8619 
8620 	return NULL;
8621 }
8622 
8623 static const struct got_error *
8624 search_start_ref_view(struct tog_view *view)
8625 {
8626 	struct tog_ref_view_state *s = &view->state.ref;
8627 
8628 	s->matched_entry = NULL;
8629 	return NULL;
8630 }
8631 
8632 static int
8633 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8634 {
8635 	regmatch_t regmatch;
8636 
8637 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8638 	    0) == 0;
8639 }
8640 
8641 static const struct got_error *
8642 search_next_ref_view(struct tog_view *view)
8643 {
8644 	struct tog_ref_view_state *s = &view->state.ref;
8645 	struct tog_reflist_entry *re = NULL;
8646 
8647 	if (!view->searching) {
8648 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8649 		return NULL;
8650 	}
8651 
8652 	if (s->matched_entry) {
8653 		if (view->searching == TOG_SEARCH_FORWARD) {
8654 			if (s->selected_entry)
8655 				re = TAILQ_NEXT(s->selected_entry, entry);
8656 			else
8657 				re = TAILQ_PREV(s->selected_entry,
8658 				    tog_reflist_head, entry);
8659 		} else {
8660 			if (s->selected_entry == NULL)
8661 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8662 			else
8663 				re = TAILQ_PREV(s->selected_entry,
8664 				    tog_reflist_head, entry);
8665 		}
8666 	} else {
8667 		if (s->selected_entry)
8668 			re = s->selected_entry;
8669 		else if (view->searching == TOG_SEARCH_FORWARD)
8670 			re = TAILQ_FIRST(&s->refs);
8671 		else
8672 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8673 	}
8674 
8675 	while (1) {
8676 		if (re == NULL) {
8677 			if (s->matched_entry == NULL) {
8678 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8679 				return NULL;
8680 			}
8681 			if (view->searching == TOG_SEARCH_FORWARD)
8682 				re = TAILQ_FIRST(&s->refs);
8683 			else
8684 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8685 		}
8686 
8687 		if (match_reflist_entry(re, &view->regex)) {
8688 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8689 			s->matched_entry = re;
8690 			break;
8691 		}
8692 
8693 		if (view->searching == TOG_SEARCH_FORWARD)
8694 			re = TAILQ_NEXT(re, entry);
8695 		else
8696 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8697 	}
8698 
8699 	if (s->matched_entry) {
8700 		s->first_displayed_entry = s->matched_entry;
8701 		s->selected = 0;
8702 	}
8703 
8704 	return NULL;
8705 }
8706 
8707 static const struct got_error *
8708 show_ref_view(struct tog_view *view)
8709 {
8710 	const struct got_error *err = NULL;
8711 	struct tog_ref_view_state *s = &view->state.ref;
8712 	struct tog_reflist_entry *re;
8713 	char *line = NULL;
8714 	wchar_t *wline;
8715 	struct tog_color *tc;
8716 	int width, n, scrollx;
8717 	int limit = view->nlines;
8718 
8719 	werase(view->window);
8720 
8721 	s->ndisplayed = 0;
8722 	if (view_is_hsplit_top(view))
8723 		--limit;  /* border */
8724 
8725 	if (limit == 0)
8726 		return NULL;
8727 
8728 	re = s->first_displayed_entry;
8729 
8730 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8731 	    s->nrefs) == -1)
8732 		return got_error_from_errno("asprintf");
8733 
8734 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8735 	if (err) {
8736 		free(line);
8737 		return err;
8738 	}
8739 	if (view_needs_focus_indication(view))
8740 		wstandout(view->window);
8741 	waddwstr(view->window, wline);
8742 	while (width++ < view->ncols)
8743 		waddch(view->window, ' ');
8744 	if (view_needs_focus_indication(view))
8745 		wstandend(view->window);
8746 	free(wline);
8747 	wline = NULL;
8748 	free(line);
8749 	line = NULL;
8750 	if (--limit <= 0)
8751 		return NULL;
8752 
8753 	n = 0;
8754 	view->maxx = 0;
8755 	while (re && limit > 0) {
8756 		char *line = NULL;
8757 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8758 
8759 		if (s->show_date) {
8760 			struct got_commit_object *ci;
8761 			struct got_tag_object *tag;
8762 			struct got_object_id *id;
8763 			struct tm tm;
8764 			time_t t;
8765 
8766 			err = got_ref_resolve(&id, s->repo, re->ref);
8767 			if (err)
8768 				return err;
8769 			err = got_object_open_as_tag(&tag, s->repo, id);
8770 			if (err) {
8771 				if (err->code != GOT_ERR_OBJ_TYPE) {
8772 					free(id);
8773 					return err;
8774 				}
8775 				err = got_object_open_as_commit(&ci, s->repo,
8776 				    id);
8777 				if (err) {
8778 					free(id);
8779 					return err;
8780 				}
8781 				t = got_object_commit_get_committer_time(ci);
8782 				got_object_commit_close(ci);
8783 			} else {
8784 				t = got_object_tag_get_tagger_time(tag);
8785 				got_object_tag_close(tag);
8786 			}
8787 			free(id);
8788 			if (gmtime_r(&t, &tm) == NULL)
8789 				return got_error_from_errno("gmtime_r");
8790 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8791 				return got_error(GOT_ERR_NO_SPACE);
8792 		}
8793 		if (got_ref_is_symbolic(re->ref)) {
8794 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8795 			    ymd : "", got_ref_get_name(re->ref),
8796 			    got_ref_get_symref_target(re->ref)) == -1)
8797 				return got_error_from_errno("asprintf");
8798 		} else if (s->show_ids) {
8799 			struct got_object_id *id;
8800 			char *id_str;
8801 			err = got_ref_resolve(&id, s->repo, re->ref);
8802 			if (err)
8803 				return err;
8804 			err = got_object_id_str(&id_str, id);
8805 			if (err) {
8806 				free(id);
8807 				return err;
8808 			}
8809 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8810 			    got_ref_get_name(re->ref), id_str) == -1) {
8811 				err = got_error_from_errno("asprintf");
8812 				free(id);
8813 				free(id_str);
8814 				return err;
8815 			}
8816 			free(id);
8817 			free(id_str);
8818 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8819 		    got_ref_get_name(re->ref)) == -1)
8820 			return got_error_from_errno("asprintf");
8821 
8822 		/* use full line width to determine view->maxx */
8823 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8824 		if (err) {
8825 			free(line);
8826 			return err;
8827 		}
8828 		view->maxx = MAX(view->maxx, width);
8829 		free(wline);
8830 		wline = NULL;
8831 
8832 		err = format_line(&wline, &width, &scrollx, line, view->x,
8833 		    view->ncols, 0, 0);
8834 		if (err) {
8835 			free(line);
8836 			return err;
8837 		}
8838 		if (n == s->selected) {
8839 			if (view->focussed)
8840 				wstandout(view->window);
8841 			s->selected_entry = re;
8842 		}
8843 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8844 		if (tc)
8845 			wattr_on(view->window,
8846 			    COLOR_PAIR(tc->colorpair), NULL);
8847 		waddwstr(view->window, &wline[scrollx]);
8848 		if (tc)
8849 			wattr_off(view->window,
8850 			    COLOR_PAIR(tc->colorpair), NULL);
8851 		if (width < view->ncols)
8852 			waddch(view->window, '\n');
8853 		if (n == s->selected && view->focussed)
8854 			wstandend(view->window);
8855 		free(line);
8856 		free(wline);
8857 		wline = NULL;
8858 		n++;
8859 		s->ndisplayed++;
8860 		s->last_displayed_entry = re;
8861 
8862 		limit--;
8863 		re = TAILQ_NEXT(re, entry);
8864 	}
8865 
8866 	view_border(view);
8867 	return err;
8868 }
8869 
8870 static const struct got_error *
8871 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8872     struct tog_reflist_entry *re, struct got_repository *repo)
8873 {
8874 	const struct got_error *err = NULL;
8875 	struct got_object_id *commit_id = NULL;
8876 	struct tog_view *tree_view;
8877 
8878 	*new_view = NULL;
8879 
8880 	err = resolve_reflist_entry(&commit_id, re, repo);
8881 	if (err) {
8882 		if (err->code != GOT_ERR_OBJ_TYPE)
8883 			return err;
8884 		else
8885 			return NULL;
8886 	}
8887 
8888 
8889 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8890 	if (tree_view == NULL) {
8891 		err = got_error_from_errno("view_open");
8892 		goto done;
8893 	}
8894 
8895 	err = open_tree_view(tree_view, commit_id,
8896 	    got_ref_get_name(re->ref), repo);
8897 	if (err)
8898 		goto done;
8899 
8900 	*new_view = tree_view;
8901 done:
8902 	free(commit_id);
8903 	return err;
8904 }
8905 
8906 static const struct got_error *
8907 ref_goto_line(struct tog_view *view, int nlines)
8908 {
8909 	const struct got_error		*err = NULL;
8910 	struct tog_ref_view_state	*s = &view->state.ref;
8911 	int				 g, idx = s->selected_entry->idx;
8912 
8913 	g = view->gline;
8914 	view->gline = 0;
8915 
8916 	if (g == 0)
8917 		g = 1;
8918 	else if (g > s->nrefs)
8919 		g = s->nrefs;
8920 
8921 	if (g >= s->first_displayed_entry->idx + 1 &&
8922 	    g <= s->last_displayed_entry->idx + 1 &&
8923 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8924 		s->selected = g - s->first_displayed_entry->idx - 1;
8925 		return NULL;
8926 	}
8927 
8928 	if (idx + 1 < g) {
8929 		err = ref_scroll_down(view, g - idx - 1);
8930 		if (err)
8931 			return err;
8932 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8933 		    s->first_displayed_entry->idx + s->selected < g &&
8934 		    s->selected < s->ndisplayed - 1)
8935 			s->selected = g - s->first_displayed_entry->idx - 1;
8936 	} else if (idx + 1 > g)
8937 		ref_scroll_up(s, idx - g + 1);
8938 
8939 	if (g < nlines && s->first_displayed_entry->idx == 0)
8940 		s->selected = g - 1;
8941 
8942 	return NULL;
8943 
8944 }
8945 
8946 static const struct got_error *
8947 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8948 {
8949 	const struct got_error *err = NULL;
8950 	struct tog_ref_view_state *s = &view->state.ref;
8951 	struct tog_reflist_entry *re;
8952 	int n, nscroll = view->nlines - 1;
8953 
8954 	if (view->gline)
8955 		return ref_goto_line(view, nscroll);
8956 
8957 	switch (ch) {
8958 	case '0':
8959 	case '$':
8960 	case KEY_RIGHT:
8961 	case 'l':
8962 	case KEY_LEFT:
8963 	case 'h':
8964 		horizontal_scroll_input(view, ch);
8965 		break;
8966 	case 'i':
8967 		s->show_ids = !s->show_ids;
8968 		view->count = 0;
8969 		break;
8970 	case 'm':
8971 		s->show_date = !s->show_date;
8972 		view->count = 0;
8973 		break;
8974 	case 'o':
8975 		s->sort_by_date = !s->sort_by_date;
8976 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8977 		view->count = 0;
8978 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8979 		    got_ref_cmp_by_commit_timestamp_descending :
8980 		    tog_ref_cmp_by_name, s->repo);
8981 		if (err)
8982 			break;
8983 		got_reflist_object_id_map_free(tog_refs_idmap);
8984 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8985 		    &tog_refs, s->repo);
8986 		if (err)
8987 			break;
8988 		ref_view_free_refs(s);
8989 		err = ref_view_load_refs(s);
8990 		break;
8991 	case KEY_ENTER:
8992 	case '\r':
8993 		view->count = 0;
8994 		if (!s->selected_entry)
8995 			break;
8996 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8997 		break;
8998 	case 'T':
8999 		view->count = 0;
9000 		if (!s->selected_entry)
9001 			break;
9002 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
9003 		break;
9004 	case 'g':
9005 	case '=':
9006 	case KEY_HOME:
9007 		s->selected = 0;
9008 		view->count = 0;
9009 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
9010 		break;
9011 	case 'G':
9012 	case '*':
9013 	case KEY_END: {
9014 		int eos = view->nlines - 1;
9015 
9016 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
9017 			--eos;  /* border */
9018 		s->selected = 0;
9019 		view->count = 0;
9020 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
9021 		for (n = 0; n < eos; n++) {
9022 			if (re == NULL)
9023 				break;
9024 			s->first_displayed_entry = re;
9025 			re = TAILQ_PREV(re, tog_reflist_head, entry);
9026 		}
9027 		if (n > 0)
9028 			s->selected = n - 1;
9029 		break;
9030 	}
9031 	case 'k':
9032 	case KEY_UP:
9033 	case CTRL('p'):
9034 		if (s->selected > 0) {
9035 			s->selected--;
9036 			break;
9037 		}
9038 		ref_scroll_up(s, 1);
9039 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9040 			view->count = 0;
9041 		break;
9042 	case CTRL('u'):
9043 	case 'u':
9044 		nscroll /= 2;
9045 		/* FALL THROUGH */
9046 	case KEY_PPAGE:
9047 	case CTRL('b'):
9048 	case 'b':
9049 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
9050 			s->selected -= MIN(nscroll, s->selected);
9051 		ref_scroll_up(s, MAX(0, nscroll));
9052 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9053 			view->count = 0;
9054 		break;
9055 	case 'j':
9056 	case KEY_DOWN:
9057 	case CTRL('n'):
9058 		if (s->selected < s->ndisplayed - 1) {
9059 			s->selected++;
9060 			break;
9061 		}
9062 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9063 			/* can't scroll any further */
9064 			view->count = 0;
9065 			break;
9066 		}
9067 		ref_scroll_down(view, 1);
9068 		break;
9069 	case CTRL('d'):
9070 	case 'd':
9071 		nscroll /= 2;
9072 		/* FALL THROUGH */
9073 	case KEY_NPAGE:
9074 	case CTRL('f'):
9075 	case 'f':
9076 	case ' ':
9077 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9078 			/* can't scroll any further; move cursor down */
9079 			if (s->selected < s->ndisplayed - 1)
9080 				s->selected += MIN(nscroll,
9081 				    s->ndisplayed - s->selected - 1);
9082 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
9083 				s->selected += s->ndisplayed - s->selected - 1;
9084 			view->count = 0;
9085 			break;
9086 		}
9087 		ref_scroll_down(view, nscroll);
9088 		break;
9089 	case CTRL('l'):
9090 		view->count = 0;
9091 		tog_free_refs();
9092 		err = tog_load_refs(s->repo, s->sort_by_date);
9093 		if (err)
9094 			break;
9095 		ref_view_free_refs(s);
9096 		err = ref_view_load_refs(s);
9097 		break;
9098 	case KEY_RESIZE:
9099 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9100 			s->selected = view->nlines - 2;
9101 		break;
9102 	default:
9103 		view->count = 0;
9104 		break;
9105 	}
9106 
9107 	return err;
9108 }
9109 
9110 __dead static void
9111 usage_ref(void)
9112 {
9113 	endwin();
9114 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9115 	    getprogname());
9116 	exit(1);
9117 }
9118 
9119 static const struct got_error *
9120 cmd_ref(int argc, char *argv[])
9121 {
9122 	const struct got_error *error;
9123 	struct got_repository *repo = NULL;
9124 	struct got_worktree *worktree = NULL;
9125 	char *cwd = NULL, *repo_path = NULL;
9126 	int ch;
9127 	struct tog_view *view;
9128 	int *pack_fds = NULL;
9129 
9130 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9131 		switch (ch) {
9132 		case 'r':
9133 			repo_path = realpath(optarg, NULL);
9134 			if (repo_path == NULL)
9135 				return got_error_from_errno2("realpath",
9136 				    optarg);
9137 			break;
9138 		default:
9139 			usage_ref();
9140 			/* NOTREACHED */
9141 		}
9142 	}
9143 
9144 	argc -= optind;
9145 	argv += optind;
9146 
9147 	if (argc > 1)
9148 		usage_ref();
9149 
9150 	error = got_repo_pack_fds_open(&pack_fds);
9151 	if (error != NULL)
9152 		goto done;
9153 
9154 	if (repo_path == NULL) {
9155 		cwd = getcwd(NULL, 0);
9156 		if (cwd == NULL)
9157 			return got_error_from_errno("getcwd");
9158 		error = got_worktree_open(&worktree, cwd, NULL);
9159 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9160 			goto done;
9161 		if (worktree)
9162 			repo_path =
9163 			    strdup(got_worktree_get_repo_path(worktree));
9164 		else
9165 			repo_path = strdup(cwd);
9166 		if (repo_path == NULL) {
9167 			error = got_error_from_errno("strdup");
9168 			goto done;
9169 		}
9170 	}
9171 
9172 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9173 	if (error != NULL)
9174 		goto done;
9175 
9176 	init_curses();
9177 
9178 	error = apply_unveil(got_repo_get_path(repo), NULL);
9179 	if (error)
9180 		goto done;
9181 
9182 	error = tog_load_refs(repo, 0);
9183 	if (error)
9184 		goto done;
9185 
9186 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9187 	if (view == NULL) {
9188 		error = got_error_from_errno("view_open");
9189 		goto done;
9190 	}
9191 
9192 	error = open_ref_view(view, repo);
9193 	if (error)
9194 		goto done;
9195 
9196 	if (worktree) {
9197 		error = set_tog_base_commit(repo, worktree);
9198 		if (error != NULL)
9199 			goto done;
9200 
9201 		/* Release work tree lock. */
9202 		got_worktree_close(worktree);
9203 		worktree = NULL;
9204 	}
9205 
9206 	error = view_loop(view);
9207 
9208 done:
9209 	free(tog_base_commit.id);
9210 	free(repo_path);
9211 	free(cwd);
9212 	if (worktree != NULL)
9213 		got_worktree_close(worktree);
9214 	if (repo) {
9215 		const struct got_error *close_err = got_repo_close(repo);
9216 		if (close_err)
9217 			error = close_err;
9218 	}
9219 	if (pack_fds) {
9220 		const struct got_error *pack_err =
9221 		    got_repo_pack_fds_close(pack_fds);
9222 		if (error == NULL)
9223 			error = pack_err;
9224 	}
9225 	tog_free_refs();
9226 	return error;
9227 }
9228 
9229 static const struct got_error*
9230 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9231     const char *str)
9232 {
9233 	size_t len;
9234 
9235 	if (win == NULL)
9236 		win = stdscr;
9237 
9238 	len = strlen(str);
9239 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9240 
9241 	if (focus)
9242 		wstandout(win);
9243 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9244 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9245 	if (focus)
9246 		wstandend(win);
9247 
9248 	return NULL;
9249 }
9250 
9251 static const struct got_error *
9252 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9253 {
9254 	off_t *p;
9255 
9256 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9257 	if (p == NULL) {
9258 		free(*line_offsets);
9259 		*line_offsets = NULL;
9260 		return got_error_from_errno("reallocarray");
9261 	}
9262 
9263 	*line_offsets = p;
9264 	(*line_offsets)[*nlines] = off;
9265 	++(*nlines);
9266 	return NULL;
9267 }
9268 
9269 static const struct got_error *
9270 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9271 {
9272 	*ret = 0;
9273 
9274 	for (;n > 0; --n, ++km) {
9275 		char	*t0, *t, *k;
9276 		size_t	 len = 1;
9277 
9278 		if (km->keys == NULL)
9279 			continue;
9280 
9281 		t = t0 = strdup(km->keys);
9282 		if (t0 == NULL)
9283 			return got_error_from_errno("strdup");
9284 
9285 		len += strlen(t);
9286 		while ((k = strsep(&t, " ")) != NULL)
9287 			len += strlen(k) > 1 ? 2 : 0;
9288 		free(t0);
9289 		*ret = MAX(*ret, len);
9290 	}
9291 
9292 	return NULL;
9293 }
9294 
9295 /*
9296  * Write keymap section headers, keys, and key info in km to f.
9297  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9298  * wrap control and symbolic keys in guillemets, else use <>.
9299  */
9300 static const struct got_error *
9301 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9302 {
9303 	int n, len = width;
9304 
9305 	if (km->keys) {
9306 		static const char *u8_glyph[] = {
9307 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9308 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9309 		};
9310 		char	*t0, *t, *k;
9311 		int	 cs, s, first = 1;
9312 
9313 		cs = got_locale_is_utf8();
9314 
9315 		t = t0 = strdup(km->keys);
9316 		if (t0 == NULL)
9317 			return got_error_from_errno("strdup");
9318 
9319 		len = strlen(km->keys);
9320 		while ((k = strsep(&t, " ")) != NULL) {
9321 			s = strlen(k) > 1;  /* control or symbolic key */
9322 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9323 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9324 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9325 			if (n < 0) {
9326 				free(t0);
9327 				return got_error_from_errno("fprintf");
9328 			}
9329 			first = 0;
9330 			len += s ? 2 : 0;
9331 			*off += n;
9332 		}
9333 		free(t0);
9334 	}
9335 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9336 	if (n < 0)
9337 		return got_error_from_errno("fprintf");
9338 	*off += n;
9339 
9340 	return NULL;
9341 }
9342 
9343 static const struct got_error *
9344 format_help(struct tog_help_view_state *s)
9345 {
9346 	const struct got_error		*err = NULL;
9347 	off_t				 off = 0;
9348 	int				 i, max, n, show = s->all;
9349 	static const struct tog_key_map	 km[] = {
9350 #define KEYMAP_(info, type)	{ NULL, (info), type }
9351 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9352 		GENERATE_HELP
9353 #undef KEYMAP_
9354 #undef KEY_
9355 	};
9356 
9357 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9358 	if (err)
9359 		return err;
9360 
9361 	n = nitems(km);
9362 	err = max_key_str(&max, km, n);
9363 	if (err)
9364 		return err;
9365 
9366 	for (i = 0; i < n; ++i) {
9367 		if (km[i].keys == NULL) {
9368 			show = s->all;
9369 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9370 			    km[i].type == s->type || s->all)
9371 				show = 1;
9372 		}
9373 		if (show) {
9374 			err = format_help_line(&off, s->f, &km[i], max);
9375 			if (err)
9376 				return err;
9377 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9378 			if (err)
9379 				return err;
9380 		}
9381 	}
9382 	fputc('\n', s->f);
9383 	++off;
9384 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9385 	return err;
9386 }
9387 
9388 static const struct got_error *
9389 create_help(struct tog_help_view_state *s)
9390 {
9391 	FILE			*f;
9392 	const struct got_error	*err;
9393 
9394 	free(s->line_offsets);
9395 	s->line_offsets = NULL;
9396 	s->nlines = 0;
9397 
9398 	f = got_opentemp();
9399 	if (f == NULL)
9400 		return got_error_from_errno("got_opentemp");
9401 	s->f = f;
9402 
9403 	err = format_help(s);
9404 	if (err)
9405 		return err;
9406 
9407 	if (s->f && fflush(s->f) != 0)
9408 		return got_error_from_errno("fflush");
9409 
9410 	return NULL;
9411 }
9412 
9413 static const struct got_error *
9414 search_start_help_view(struct tog_view *view)
9415 {
9416 	view->state.help.matched_line = 0;
9417 	return NULL;
9418 }
9419 
9420 static void
9421 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9422     size_t *nlines, int **first, int **last, int **match, int **selected)
9423 {
9424 	struct tog_help_view_state *s = &view->state.help;
9425 
9426 	*f = s->f;
9427 	*nlines = s->nlines;
9428 	*line_offsets = s->line_offsets;
9429 	*match = &s->matched_line;
9430 	*first = &s->first_displayed_line;
9431 	*last = &s->last_displayed_line;
9432 	*selected = &s->selected_line;
9433 }
9434 
9435 static const struct got_error *
9436 show_help_view(struct tog_view *view)
9437 {
9438 	struct tog_help_view_state	*s = &view->state.help;
9439 	const struct got_error		*err;
9440 	regmatch_t			*regmatch = &view->regmatch;
9441 	wchar_t				*wline;
9442 	char				*line;
9443 	ssize_t				 linelen;
9444 	size_t				 linesz = 0;
9445 	int				 width, nprinted = 0, rc = 0;
9446 	int				 eos = view->nlines;
9447 
9448 	if (view_is_hsplit_top(view))
9449 		--eos;  /* account for border */
9450 
9451 	s->lineno = 0;
9452 	rewind(s->f);
9453 	werase(view->window);
9454 
9455 	if (view->gline > s->nlines - 1)
9456 		view->gline = s->nlines - 1;
9457 
9458 	err = win_draw_center(view->window, 0, 0, view->ncols,
9459 	    view_needs_focus_indication(view),
9460 	    "tog help (press q to return to tog)");
9461 	if (err)
9462 		return err;
9463 	if (eos <= 1)
9464 		return NULL;
9465 	waddstr(view->window, "\n\n");
9466 	eos -= 2;
9467 
9468 	s->eof = 0;
9469 	view->maxx = 0;
9470 	line = NULL;
9471 	while (eos > 0 && nprinted < eos) {
9472 		attr_t attr = 0;
9473 
9474 		linelen = getline(&line, &linesz, s->f);
9475 		if (linelen == -1) {
9476 			if (!feof(s->f)) {
9477 				free(line);
9478 				return got_ferror(s->f, GOT_ERR_IO);
9479 			}
9480 			s->eof = 1;
9481 			break;
9482 		}
9483 		if (++s->lineno < s->first_displayed_line)
9484 			continue;
9485 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9486 			continue;
9487 		if (s->lineno == view->hiline)
9488 			attr = A_STANDOUT;
9489 
9490 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9491 		    view->x ? 1 : 0);
9492 		if (err) {
9493 			free(line);
9494 			return err;
9495 		}
9496 		view->maxx = MAX(view->maxx, width);
9497 		free(wline);
9498 		wline = NULL;
9499 
9500 		if (attr)
9501 			wattron(view->window, attr);
9502 		if (s->first_displayed_line + nprinted == s->matched_line &&
9503 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9504 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9505 			    view->window, view->x, regmatch);
9506 			if (err) {
9507 				free(line);
9508 				return err;
9509 			}
9510 		} else {
9511 			int skip;
9512 
9513 			err = format_line(&wline, &width, &skip, line,
9514 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9515 			if (err) {
9516 				free(line);
9517 				return err;
9518 			}
9519 			waddwstr(view->window, &wline[skip]);
9520 			free(wline);
9521 			wline = NULL;
9522 		}
9523 		if (s->lineno == view->hiline) {
9524 			while (width++ < view->ncols)
9525 				waddch(view->window, ' ');
9526 		} else {
9527 			if (width < view->ncols)
9528 				waddch(view->window, '\n');
9529 		}
9530 		if (attr)
9531 			wattroff(view->window, attr);
9532 		if (++nprinted == 1)
9533 			s->first_displayed_line = s->lineno;
9534 	}
9535 	free(line);
9536 	if (nprinted > 0)
9537 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9538 	else
9539 		s->last_displayed_line = s->first_displayed_line;
9540 
9541 	view_border(view);
9542 
9543 	if (s->eof) {
9544 		rc = waddnstr(view->window,
9545 		    "See the tog(1) manual page for full documentation",
9546 		    view->ncols - 1);
9547 		if (rc == ERR)
9548 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9549 	} else {
9550 		wmove(view->window, view->nlines - 1, 0);
9551 		wclrtoeol(view->window);
9552 		wstandout(view->window);
9553 		rc = waddnstr(view->window, "scroll down for more...",
9554 		    view->ncols - 1);
9555 		if (rc == ERR)
9556 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9557 		if (getcurx(view->window) < view->ncols - 6) {
9558 			rc = wprintw(view->window, "[%.0f%%]",
9559 			    100.00 * s->last_displayed_line / s->nlines);
9560 			if (rc == ERR)
9561 				return got_error_msg(GOT_ERR_IO, "wprintw");
9562 		}
9563 		wstandend(view->window);
9564 	}
9565 
9566 	return NULL;
9567 }
9568 
9569 static const struct got_error *
9570 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9571 {
9572 	struct tog_help_view_state	*s = &view->state.help;
9573 	const struct got_error		*err = NULL;
9574 	char				*line = NULL;
9575 	ssize_t				 linelen;
9576 	size_t				 linesz = 0;
9577 	int				 eos, nscroll;
9578 
9579 	eos = nscroll = view->nlines;
9580 	if (view_is_hsplit_top(view))
9581 		--eos;  /* border */
9582 
9583 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9584 
9585 	switch (ch) {
9586 	case '0':
9587 	case '$':
9588 	case KEY_RIGHT:
9589 	case 'l':
9590 	case KEY_LEFT:
9591 	case 'h':
9592 		horizontal_scroll_input(view, ch);
9593 		break;
9594 	case 'g':
9595 	case KEY_HOME:
9596 		s->first_displayed_line = 1;
9597 		view->count = 0;
9598 		break;
9599 	case 'G':
9600 	case KEY_END:
9601 		view->count = 0;
9602 		if (s->eof)
9603 			break;
9604 		s->first_displayed_line = (s->nlines - eos) + 3;
9605 		s->eof = 1;
9606 		break;
9607 	case 'k':
9608 	case KEY_UP:
9609 		if (s->first_displayed_line > 1)
9610 			--s->first_displayed_line;
9611 		else
9612 			view->count = 0;
9613 		break;
9614 	case CTRL('u'):
9615 	case 'u':
9616 		nscroll /= 2;
9617 		/* FALL THROUGH */
9618 	case KEY_PPAGE:
9619 	case CTRL('b'):
9620 	case 'b':
9621 		if (s->first_displayed_line == 1) {
9622 			view->count = 0;
9623 			break;
9624 		}
9625 		while (--nscroll > 0 && s->first_displayed_line > 1)
9626 			s->first_displayed_line--;
9627 		break;
9628 	case 'j':
9629 	case KEY_DOWN:
9630 	case CTRL('n'):
9631 		if (!s->eof)
9632 			++s->first_displayed_line;
9633 		else
9634 			view->count = 0;
9635 		break;
9636 	case CTRL('d'):
9637 	case 'd':
9638 		nscroll /= 2;
9639 		/* FALL THROUGH */
9640 	case KEY_NPAGE:
9641 	case CTRL('f'):
9642 	case 'f':
9643 	case ' ':
9644 		if (s->eof) {
9645 			view->count = 0;
9646 			break;
9647 		}
9648 		while (!s->eof && --nscroll > 0) {
9649 			linelen = getline(&line, &linesz, s->f);
9650 			s->first_displayed_line++;
9651 			if (linelen == -1) {
9652 				if (feof(s->f))
9653 					s->eof = 1;
9654 				else
9655 					err = got_ferror(s->f, GOT_ERR_IO);
9656 				break;
9657 			}
9658 		}
9659 		free(line);
9660 		break;
9661 	default:
9662 		view->count = 0;
9663 		break;
9664 	}
9665 
9666 	return err;
9667 }
9668 
9669 static const struct got_error *
9670 close_help_view(struct tog_view *view)
9671 {
9672 	struct tog_help_view_state *s = &view->state.help;
9673 
9674 	free(s->line_offsets);
9675 	s->line_offsets = NULL;
9676 	if (fclose(s->f) == EOF)
9677 		return got_error_from_errno("fclose");
9678 
9679 	return NULL;
9680 }
9681 
9682 static const struct got_error *
9683 reset_help_view(struct tog_view *view)
9684 {
9685 	struct tog_help_view_state *s = &view->state.help;
9686 
9687 
9688 	if (s->f && fclose(s->f) == EOF)
9689 		return got_error_from_errno("fclose");
9690 
9691 	wclear(view->window);
9692 	view->count = 0;
9693 	view->x = 0;
9694 	s->all = !s->all;
9695 	s->first_displayed_line = 1;
9696 	s->last_displayed_line = view->nlines;
9697 	s->matched_line = 0;
9698 
9699 	return create_help(s);
9700 }
9701 
9702 static const struct got_error *
9703 open_help_view(struct tog_view *view, struct tog_view *parent)
9704 {
9705 	const struct got_error		*err = NULL;
9706 	struct tog_help_view_state	*s = &view->state.help;
9707 
9708 	s->type = (enum tog_keymap_type)parent->type;
9709 	s->first_displayed_line = 1;
9710 	s->last_displayed_line = view->nlines;
9711 	s->selected_line = 1;
9712 
9713 	view->show = show_help_view;
9714 	view->input = input_help_view;
9715 	view->reset = reset_help_view;
9716 	view->close = close_help_view;
9717 	view->search_start = search_start_help_view;
9718 	view->search_setup = search_setup_help_view;
9719 	view->search_next = search_next_view_match;
9720 
9721 	err = create_help(s);
9722 	return err;
9723 }
9724 
9725 static const struct got_error *
9726 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9727     enum tog_view_type request, int y, int x)
9728 {
9729 	const struct got_error *err = NULL;
9730 
9731 	*new_view = NULL;
9732 
9733 	switch (request) {
9734 	case TOG_VIEW_DIFF:
9735 		if (view->type == TOG_VIEW_LOG) {
9736 			struct tog_log_view_state *s = &view->state.log;
9737 
9738 			err = open_diff_view_for_commit(new_view, y, x,
9739 			    s->selected_entry->commit, s->selected_entry->id,
9740 			    view, s->repo);
9741 		} else
9742 			return got_error_msg(GOT_ERR_NOT_IMPL,
9743 			    "parent/child view pair not supported");
9744 		break;
9745 	case TOG_VIEW_BLAME:
9746 		if (view->type == TOG_VIEW_TREE) {
9747 			struct tog_tree_view_state *s = &view->state.tree;
9748 
9749 			err = blame_tree_entry(new_view, y, x,
9750 			    s->selected_entry, &s->parents, s->commit_id,
9751 			    s->repo);
9752 		} else
9753 			return got_error_msg(GOT_ERR_NOT_IMPL,
9754 			    "parent/child view pair not supported");
9755 		break;
9756 	case TOG_VIEW_LOG:
9757 		if (view->type == TOG_VIEW_BLAME)
9758 			err = log_annotated_line(new_view, y, x,
9759 			    view->state.blame.repo, view->state.blame.id_to_log);
9760 		else if (view->type == TOG_VIEW_TREE)
9761 			err = log_selected_tree_entry(new_view, y, x,
9762 			    &view->state.tree);
9763 		else if (view->type == TOG_VIEW_REF)
9764 			err = log_ref_entry(new_view, y, x,
9765 			    view->state.ref.selected_entry,
9766 			    view->state.ref.repo);
9767 		else
9768 			return got_error_msg(GOT_ERR_NOT_IMPL,
9769 			    "parent/child view pair not supported");
9770 		break;
9771 	case TOG_VIEW_TREE:
9772 		if (view->type == TOG_VIEW_LOG)
9773 			err = browse_commit_tree(new_view, y, x,
9774 			    view->state.log.selected_entry,
9775 			    view->state.log.in_repo_path,
9776 			    view->state.log.head_ref_name,
9777 			    view->state.log.repo);
9778 		else if (view->type == TOG_VIEW_REF)
9779 			err = browse_ref_tree(new_view, y, x,
9780 			    view->state.ref.selected_entry,
9781 			    view->state.ref.repo);
9782 		else
9783 			return got_error_msg(GOT_ERR_NOT_IMPL,
9784 			    "parent/child view pair not supported");
9785 		break;
9786 	case TOG_VIEW_REF:
9787 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9788 		if (*new_view == NULL)
9789 			return got_error_from_errno("view_open");
9790 		if (view->type == TOG_VIEW_LOG)
9791 			err = open_ref_view(*new_view, view->state.log.repo);
9792 		else if (view->type == TOG_VIEW_TREE)
9793 			err = open_ref_view(*new_view, view->state.tree.repo);
9794 		else
9795 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9796 			    "parent/child view pair not supported");
9797 		if (err)
9798 			view_close(*new_view);
9799 		break;
9800 	case TOG_VIEW_HELP:
9801 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9802 		if (*new_view == NULL)
9803 			return got_error_from_errno("view_open");
9804 		err = open_help_view(*new_view, view);
9805 		if (err)
9806 			view_close(*new_view);
9807 		break;
9808 	default:
9809 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9810 	}
9811 
9812 	return err;
9813 }
9814 
9815 /*
9816  * If view was scrolled down to move the selected line into view when opening a
9817  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9818  */
9819 static void
9820 offset_selection_up(struct tog_view *view)
9821 {
9822 	switch (view->type) {
9823 	case TOG_VIEW_BLAME: {
9824 		struct tog_blame_view_state *s = &view->state.blame;
9825 		if (s->first_displayed_line == 1) {
9826 			s->selected_line = MAX(s->selected_line - view->offset,
9827 			    1);
9828 			break;
9829 		}
9830 		if (s->first_displayed_line > view->offset)
9831 			s->first_displayed_line -= view->offset;
9832 		else
9833 			s->first_displayed_line = 1;
9834 		s->selected_line += view->offset;
9835 		break;
9836 	}
9837 	case TOG_VIEW_LOG:
9838 		log_scroll_up(&view->state.log, view->offset);
9839 		view->state.log.selected += view->offset;
9840 		break;
9841 	case TOG_VIEW_REF:
9842 		ref_scroll_up(&view->state.ref, view->offset);
9843 		view->state.ref.selected += view->offset;
9844 		break;
9845 	case TOG_VIEW_TREE:
9846 		tree_scroll_up(&view->state.tree, view->offset);
9847 		view->state.tree.selected += view->offset;
9848 		break;
9849 	default:
9850 		break;
9851 	}
9852 
9853 	view->offset = 0;
9854 }
9855 
9856 /*
9857  * If the selected line is in the section of screen covered by the bottom split,
9858  * scroll down offset lines to move it into view and index its new position.
9859  */
9860 static const struct got_error *
9861 offset_selection_down(struct tog_view *view)
9862 {
9863 	const struct got_error	*err = NULL;
9864 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9865 	int			*selected = NULL;
9866 	int			 header, offset;
9867 
9868 	switch (view->type) {
9869 	case TOG_VIEW_BLAME: {
9870 		struct tog_blame_view_state *s = &view->state.blame;
9871 		header = 3;
9872 		scrolld = NULL;
9873 		if (s->selected_line > view->nlines - header) {
9874 			offset = abs(view->nlines - s->selected_line - header);
9875 			s->first_displayed_line += offset;
9876 			s->selected_line -= offset;
9877 			view->offset = offset;
9878 		}
9879 		break;
9880 	}
9881 	case TOG_VIEW_LOG: {
9882 		struct tog_log_view_state *s = &view->state.log;
9883 		scrolld = &log_scroll_down;
9884 		header = view_is_parent_view(view) ? 3 : 2;
9885 		selected = &s->selected;
9886 		break;
9887 	}
9888 	case TOG_VIEW_REF: {
9889 		struct tog_ref_view_state *s = &view->state.ref;
9890 		scrolld = &ref_scroll_down;
9891 		header = 3;
9892 		selected = &s->selected;
9893 		break;
9894 	}
9895 	case TOG_VIEW_TREE: {
9896 		struct tog_tree_view_state *s = &view->state.tree;
9897 		scrolld = &tree_scroll_down;
9898 		header = 5;
9899 		selected = &s->selected;
9900 		break;
9901 	}
9902 	default:
9903 		selected = NULL;
9904 		scrolld = NULL;
9905 		header = 0;
9906 		break;
9907 	}
9908 
9909 	if (selected && *selected > view->nlines - header) {
9910 		offset = abs(view->nlines - *selected - header);
9911 		view->offset = offset;
9912 		if (scrolld && offset) {
9913 			err = scrolld(view, offset);
9914 			*selected -= offset;
9915 		}
9916 	}
9917 
9918 	return err;
9919 }
9920 
9921 static void
9922 list_commands(FILE *fp)
9923 {
9924 	size_t i;
9925 
9926 	fprintf(fp, "commands:");
9927 	for (i = 0; i < nitems(tog_commands); i++) {
9928 		const struct tog_cmd *cmd = &tog_commands[i];
9929 		fprintf(fp, " %s", cmd->name);
9930 	}
9931 	fputc('\n', fp);
9932 }
9933 
9934 __dead static void
9935 usage(int hflag, int status)
9936 {
9937 	FILE *fp = (status == 0) ? stdout : stderr;
9938 
9939 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9940 	    getprogname());
9941 	if (hflag) {
9942 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9943 		list_commands(fp);
9944 	}
9945 	exit(status);
9946 }
9947 
9948 static char **
9949 make_argv(int argc, ...)
9950 {
9951 	va_list ap;
9952 	char **argv;
9953 	int i;
9954 
9955 	va_start(ap, argc);
9956 
9957 	argv = calloc(argc, sizeof(char *));
9958 	if (argv == NULL)
9959 		err(1, "calloc");
9960 	for (i = 0; i < argc; i++) {
9961 		argv[i] = strdup(va_arg(ap, char *));
9962 		if (argv[i] == NULL)
9963 			err(1, "strdup");
9964 	}
9965 
9966 	va_end(ap);
9967 	return argv;
9968 }
9969 
9970 /*
9971  * Try to convert 'tog path' into a 'tog log path' command.
9972  * The user could simply have mistyped the command rather than knowingly
9973  * provided a path. So check whether argv[0] can in fact be resolved
9974  * to a path in the HEAD commit and print a special error if not.
9975  * This hack is for mpi@ <3
9976  */
9977 static const struct got_error *
9978 tog_log_with_path(int argc, char *argv[])
9979 {
9980 	const struct got_error *error = NULL, *close_err;
9981 	const struct tog_cmd *cmd = NULL;
9982 	struct got_repository *repo = NULL;
9983 	struct got_worktree *worktree = NULL;
9984 	struct got_object_id *commit_id = NULL, *id = NULL;
9985 	struct got_commit_object *commit = NULL;
9986 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9987 	char *commit_id_str = NULL, **cmd_argv = NULL;
9988 	int *pack_fds = NULL;
9989 
9990 	cwd = getcwd(NULL, 0);
9991 	if (cwd == NULL)
9992 		return got_error_from_errno("getcwd");
9993 
9994 	error = got_repo_pack_fds_open(&pack_fds);
9995 	if (error != NULL)
9996 		goto done;
9997 
9998 	error = got_worktree_open(&worktree, cwd, NULL);
9999 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
10000 		goto done;
10001 
10002 	if (worktree)
10003 		repo_path = strdup(got_worktree_get_repo_path(worktree));
10004 	else
10005 		repo_path = strdup(cwd);
10006 	if (repo_path == NULL) {
10007 		error = got_error_from_errno("strdup");
10008 		goto done;
10009 	}
10010 
10011 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
10012 	if (error != NULL)
10013 		goto done;
10014 
10015 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
10016 	    repo, worktree);
10017 	if (error)
10018 		goto done;
10019 
10020 	error = tog_load_refs(repo, 0);
10021 	if (error)
10022 		goto done;
10023 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
10024 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
10025 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
10026 	if (error)
10027 		goto done;
10028 
10029 	if (worktree) {
10030 		got_worktree_close(worktree);
10031 		worktree = NULL;
10032 	}
10033 
10034 	error = got_object_open_as_commit(&commit, repo, commit_id);
10035 	if (error)
10036 		goto done;
10037 
10038 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
10039 	if (error) {
10040 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
10041 			goto done;
10042 		fprintf(stderr, "%s: '%s' is no known command or path\n",
10043 		    getprogname(), argv[0]);
10044 		usage(1, 1);
10045 		/* not reached */
10046 	}
10047 
10048 	error = got_object_id_str(&commit_id_str, commit_id);
10049 	if (error)
10050 		goto done;
10051 
10052 	cmd = &tog_commands[0]; /* log */
10053 	argc = 4;
10054 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
10055 	error = cmd->cmd_main(argc, cmd_argv);
10056 done:
10057 	if (repo) {
10058 		close_err = got_repo_close(repo);
10059 		if (error == NULL)
10060 			error = close_err;
10061 	}
10062 	if (commit)
10063 		got_object_commit_close(commit);
10064 	if (worktree)
10065 		got_worktree_close(worktree);
10066 	if (pack_fds) {
10067 		const struct got_error *pack_err =
10068 		    got_repo_pack_fds_close(pack_fds);
10069 		if (error == NULL)
10070 			error = pack_err;
10071 	}
10072 	free(id);
10073 	free(commit_id_str);
10074 	free(commit_id);
10075 	free(cwd);
10076 	free(repo_path);
10077 	free(in_repo_path);
10078 	if (cmd_argv) {
10079 		int i;
10080 		for (i = 0; i < argc; i++)
10081 			free(cmd_argv[i]);
10082 		free(cmd_argv);
10083 	}
10084 	tog_free_refs();
10085 	return error;
10086 }
10087 
10088 int
10089 main(int argc, char *argv[])
10090 {
10091 	const struct got_error *io_err, *error = NULL;
10092 	const struct tog_cmd *cmd = NULL;
10093 	int ch, hflag = 0, Vflag = 0;
10094 	char **cmd_argv = NULL;
10095 	static const struct option longopts[] = {
10096 	    { "version", no_argument, NULL, 'V' },
10097 	    { NULL, 0, NULL, 0}
10098 	};
10099 	char *diff_algo_str = NULL;
10100 	const char *test_script_path;
10101 
10102 	setlocale(LC_CTYPE, "");
10103 
10104 	/*
10105 	 * Override default signal handlers before starting ncurses.
10106 	 * This should prevent ncurses from installing its own
10107 	 * broken cleanup() signal handler.
10108 	 */
10109 	signal(SIGWINCH, tog_sigwinch);
10110 	signal(SIGPIPE, tog_sigpipe);
10111 	signal(SIGCONT, tog_sigcont);
10112 	signal(SIGINT, tog_sigint);
10113 	signal(SIGTERM, tog_sigterm);
10114 
10115 	/*
10116 	 * Test mode init must happen before pledge() because "tty" will
10117 	 * not allow TTY-related ioctls to occur via regular files.
10118 	 */
10119 	test_script_path = getenv("TOG_TEST_SCRIPT");
10120 	if (test_script_path != NULL) {
10121 		error = init_mock_term(test_script_path);
10122 		if (error) {
10123 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10124 			return 1;
10125 		}
10126 	} else if (!isatty(STDIN_FILENO))
10127 		errx(1, "standard input is not a tty");
10128 
10129 #if !defined(PROFILE)
10130 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10131 	    NULL) == -1)
10132 		err(1, "pledge");
10133 #endif
10134 
10135 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10136 		switch (ch) {
10137 		case 'h':
10138 			hflag = 1;
10139 			break;
10140 		case 'V':
10141 			Vflag = 1;
10142 			break;
10143 		default:
10144 			usage(hflag, 1);
10145 			/* NOTREACHED */
10146 		}
10147 	}
10148 
10149 	argc -= optind;
10150 	argv += optind;
10151 	optind = 1;
10152 	optreset = 1;
10153 
10154 	if (Vflag) {
10155 		got_version_print_str();
10156 		return 0;
10157 	}
10158 
10159 	if (argc == 0) {
10160 		if (hflag)
10161 			usage(hflag, 0);
10162 		/* Build an argument vector which runs a default command. */
10163 		cmd = &tog_commands[0];
10164 		argc = 1;
10165 		cmd_argv = make_argv(argc, cmd->name);
10166 	} else {
10167 		size_t i;
10168 
10169 		/* Did the user specify a command? */
10170 		for (i = 0; i < nitems(tog_commands); i++) {
10171 			if (strncmp(tog_commands[i].name, argv[0],
10172 			    strlen(argv[0])) == 0) {
10173 				cmd = &tog_commands[i];
10174 				break;
10175 			}
10176 		}
10177 	}
10178 
10179 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10180 	if (diff_algo_str) {
10181 		if (strcasecmp(diff_algo_str, "patience") == 0)
10182 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10183 		if (strcasecmp(diff_algo_str, "myers") == 0)
10184 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10185 	}
10186 
10187 	tog_base_commit.idx = -1;
10188 	tog_base_commit.marker = GOT_WORKTREE_STATE_UNKNOWN;
10189 
10190 	if (cmd == NULL) {
10191 		if (argc != 1)
10192 			usage(0, 1);
10193 		/* No command specified; try log with a path */
10194 		error = tog_log_with_path(argc, argv);
10195 	} else {
10196 		if (hflag)
10197 			cmd->cmd_usage();
10198 		else
10199 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10200 	}
10201 
10202 	if (using_mock_io) {
10203 		io_err = tog_io_close();
10204 		if (error == NULL)
10205 			error = io_err;
10206 	}
10207 	endwin();
10208 	if (cmd_argv) {
10209 		int i;
10210 		for (i = 0; i < argc; i++)
10211 			free(cmd_argv[i]);
10212 		free(cmd_argv);
10213 	}
10214 
10215 	if (error && error->code != GOT_ERR_CANCELLED &&
10216 	    error->code != GOT_ERR_EOF &&
10217 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10218 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10219 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10220 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10221 		return 1;
10222 	}
10223 	return 0;
10224 }