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