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