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_PATIENCE;
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 	pthread_cond_t log_loaded;
378 	sig_atomic_t *quit;
379 	struct commit_queue_entry **first_displayed_entry;
380 	struct commit_queue_entry **selected_entry;
381 	int *searching;
382 	int *search_next_done;
383 	regex_t *regex;
384 	int *limiting;
385 	int limit_match;
386 	regex_t *limit_regex;
387 	struct commit_queue *limit_commits;
388 	struct got_worktree *worktree;
389 	int need_commit_marker;
390 };
391 
392 struct tog_log_view_state {
393 	struct commit_queue *commits;
394 	struct commit_queue_entry *first_displayed_entry;
395 	struct commit_queue_entry *last_displayed_entry;
396 	struct commit_queue_entry *selected_entry;
397 	struct commit_queue real_commits;
398 	int selected;
399 	char *in_repo_path;
400 	char *head_ref_name;
401 	int log_branches;
402 	struct got_repository *repo;
403 	struct got_object_id *start_id;
404 	sig_atomic_t quit;
405 	pthread_t thread;
406 	struct tog_log_thread_args thread_args;
407 	struct commit_queue_entry *matched_entry;
408 	struct commit_queue_entry *search_entry;
409 	struct tog_colors colors;
410 	int use_committer;
411 	int limit_view;
412 	regex_t limit_regex;
413 	struct commit_queue limit_commits;
414 };
415 
416 #define TOG_COLOR_DIFF_MINUS		1
417 #define TOG_COLOR_DIFF_PLUS		2
418 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
419 #define TOG_COLOR_DIFF_META		4
420 #define TOG_COLOR_TREE_SUBMODULE	5
421 #define TOG_COLOR_TREE_SYMLINK		6
422 #define TOG_COLOR_TREE_DIRECTORY	7
423 #define TOG_COLOR_TREE_EXECUTABLE	8
424 #define TOG_COLOR_COMMIT		9
425 #define TOG_COLOR_AUTHOR		10
426 #define TOG_COLOR_DATE			11
427 #define TOG_COLOR_REFS_HEADS		12
428 #define TOG_COLOR_REFS_TAGS		13
429 #define TOG_COLOR_REFS_REMOTES		14
430 #define TOG_COLOR_REFS_BACKUP		15
431 
432 struct tog_blame_cb_args {
433 	struct tog_blame_line *lines; /* one per line */
434 	int nlines;
435 
436 	struct tog_view *view;
437 	struct got_object_id *commit_id;
438 	int *quit;
439 };
440 
441 struct tog_blame_thread_args {
442 	const char *path;
443 	struct got_repository *repo;
444 	struct tog_blame_cb_args *cb_args;
445 	int *complete;
446 	got_cancel_cb cancel_cb;
447 	void *cancel_arg;
448 	pthread_cond_t blame_complete;
449 };
450 
451 struct tog_blame {
452 	FILE *f;
453 	off_t filesize;
454 	struct tog_blame_line *lines;
455 	int nlines;
456 	off_t *line_offsets;
457 	pthread_t thread;
458 	struct tog_blame_thread_args thread_args;
459 	struct tog_blame_cb_args cb_args;
460 	const char *path;
461 	int *pack_fds;
462 };
463 
464 struct tog_blame_view_state {
465 	int first_displayed_line;
466 	int last_displayed_line;
467 	int selected_line;
468 	int last_diffed_line;
469 	int blame_complete;
470 	int eof;
471 	int done;
472 	struct got_object_id_queue blamed_commits;
473 	struct got_object_qid *blamed_commit;
474 	char *path;
475 	struct got_repository *repo;
476 	struct got_object_id *commit_id;
477 	struct got_object_id *id_to_log;
478 	struct tog_blame blame;
479 	int matched_line;
480 	struct tog_colors colors;
481 };
482 
483 struct tog_parent_tree {
484 	TAILQ_ENTRY(tog_parent_tree) entry;
485 	struct got_tree_object *tree;
486 	struct got_tree_entry *first_displayed_entry;
487 	struct got_tree_entry *selected_entry;
488 	int selected;
489 };
490 
491 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
492 
493 struct tog_tree_view_state {
494 	char *tree_label;
495 	struct got_object_id *commit_id;/* commit which this tree belongs to */
496 	struct got_tree_object *root;	/* the commit's root tree entry */
497 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
498 	struct got_tree_entry *first_displayed_entry;
499 	struct got_tree_entry *last_displayed_entry;
500 	struct got_tree_entry *selected_entry;
501 	int ndisplayed, selected, show_ids;
502 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
503 	char *head_ref_name;
504 	struct got_repository *repo;
505 	struct got_tree_entry *matched_entry;
506 	struct tog_colors colors;
507 };
508 
509 struct tog_reflist_entry {
510 	TAILQ_ENTRY(tog_reflist_entry) entry;
511 	struct got_reference *ref;
512 	int idx;
513 };
514 
515 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
516 
517 struct tog_ref_view_state {
518 	struct tog_reflist_head refs;
519 	struct tog_reflist_entry *first_displayed_entry;
520 	struct tog_reflist_entry *last_displayed_entry;
521 	struct tog_reflist_entry *selected_entry;
522 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
523 	struct got_repository *repo;
524 	struct tog_reflist_entry *matched_entry;
525 	struct tog_colors colors;
526 };
527 
528 struct tog_help_view_state {
529 	FILE			*f;
530 	off_t			*line_offsets;
531 	size_t			 nlines;
532 	int			 lineno;
533 	int			 first_displayed_line;
534 	int			 last_displayed_line;
535 	int			 eof;
536 	int			 matched_line;
537 	int			 selected_line;
538 	int			 all;
539 	enum tog_keymap_type	 type;
540 };
541 
542 #define GENERATE_HELP \
543 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
544 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
545 	KEY_("k C-p Up", "Move cursor or page up one line"), \
546 	KEY_("j C-n Down", "Move cursor or page down one line"), \
547 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
548 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
549 	KEY_("C-u u", "Scroll the view up one half page"), \
550 	KEY_("C-d d", "Scroll the view down one half page"), \
551 	KEY_("g", "Go to line N (default: first line)"), \
552 	KEY_("Home =", "Go to the first line"), \
553 	KEY_("G", "Go to line N (default: last line)"), \
554 	KEY_("End *", "Go to the last line"), \
555 	KEY_("l Right", "Scroll the view right"), \
556 	KEY_("h Left", "Scroll the view left"), \
557 	KEY_("$", "Scroll view to the rightmost position"), \
558 	KEY_("0", "Scroll view to the leftmost position"), \
559 	KEY_("-", "Decrease size of the focussed split"), \
560 	KEY_("+", "Increase size of the focussed split"), \
561 	KEY_("Tab", "Switch focus between views"), \
562 	KEY_("F", "Toggle fullscreen mode"), \
563 	KEY_("S", "Switch split-screen layout"), \
564 	KEY_("/", "Open prompt to enter search term"), \
565 	KEY_("n", "Find next line/token matching the current search term"), \
566 	KEY_("N", "Find previous line/token matching the current search term"),\
567 	KEY_("q", "Quit the focussed view; Quit help screen"), \
568 	KEY_("Q", "Quit tog"), \
569 	\
570 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
571 	KEY_("< ,", "Move cursor up one commit"), \
572 	KEY_("> .", "Move cursor down one commit"), \
573 	KEY_("Enter", "Open diff view of the selected commit"), \
574 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
575 	KEY_("R", "Open ref view of all repository references"), \
576 	KEY_("T", "Display tree view of the repository from the selected" \
577 	    " commit"), \
578 	KEY_("@", "Toggle between displaying author and committer name"), \
579 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
580 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
581 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
582 	\
583 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
584 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
585 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
586 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
587 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
588 	    " data"), \
589 	KEY_("(", "Go to the previous file in the diff"), \
590 	KEY_(")", "Go to the next file in the diff"), \
591 	KEY_("{", "Go to the previous hunk in the diff"), \
592 	KEY_("}", "Go to the next hunk in the diff"), \
593 	KEY_("[", "Decrease the number of context lines"), \
594 	KEY_("]", "Increase the number of context lines"), \
595 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
596 	\
597 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
598 	KEY_("Enter", "Display diff view of the selected line's commit"), \
599 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
600 	KEY_("L", "Open log view for the currently selected annotated line"), \
601 	KEY_("C", "Reload view with the previously blamed commit"), \
602 	KEY_("c", "Reload view with the version of the file found in the" \
603 	    " selected line's commit"), \
604 	KEY_("p", "Reload view with the version of the file found in the" \
605 	    " selected line's parent commit"), \
606 	\
607 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
608 	KEY_("Enter", "Enter selected directory or open blame view of the" \
609 	    " selected file"), \
610 	KEY_("L", "Open log view for the selected entry"), \
611 	KEY_("R", "Open ref view of all repository references"), \
612 	KEY_("i", "Show object IDs for all tree entries"), \
613 	KEY_("Backspace", "Return to the parent directory"), \
614 	\
615 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
616 	KEY_("Enter", "Display log view of the selected reference"), \
617 	KEY_("T", "Display tree view of the selected reference"), \
618 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
619 	KEY_("m", "Toggle display of last modified date for each reference"), \
620 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
621 	KEY_("C-l", "Reload view with all repository references")
622 
623 struct tog_key_map {
624 	const char		*keys;
625 	const char		*info;
626 	enum tog_keymap_type	 type;
627 };
628 
629 /* curses io for tog regress */
630 struct tog_io {
631 	FILE	*cin;
632 	FILE	*cout;
633 	FILE	*f;
634 	FILE	*sdump;
635 	char	*input_str;
636 	int	 wait_for_ui;
637 } tog_io;
638 static int using_mock_io;
639 
640 #define TOG_KEY_SCRDUMP	SHRT_MIN
641 
642 /*
643  * We implement two types of views: parent views and child views.
644  *
645  * The 'Tab' key switches focus between a parent view and its child view.
646  * Child views are shown side-by-side to their parent view, provided
647  * there is enough screen estate.
648  *
649  * When a new view is opened from within a parent view, this new view
650  * becomes a child view of the parent view, replacing any existing child.
651  *
652  * When a new view is opened from within a child view, this new view
653  * becomes a parent view which will obscure the views below until the
654  * user quits the new parent view by typing 'q'.
655  *
656  * This list of views contains parent views only.
657  * Child views are only pointed to by their parent view.
658  */
659 TAILQ_HEAD(tog_view_list_head, tog_view);
660 
661 struct tog_view {
662 	TAILQ_ENTRY(tog_view) entry;
663 	WINDOW *window;
664 	PANEL *panel;
665 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
666 	int resized_y, resized_x; /* begin_y/x based on user resizing */
667 	int maxx, x; /* max column and current start column */
668 	int lines, cols; /* copies of LINES and COLS */
669 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
670 	int gline, hiline; /* navigate to and highlight this nG line */
671 	int ch, count; /* current keymap and count prefix */
672 	int resized; /* set when in a resize event */
673 	int focussed; /* Only set on one parent or child view at a time. */
674 	int dying;
675 	struct tog_view *parent;
676 	struct tog_view *child;
677 
678 	/*
679 	 * This flag is initially set on parent views when a new child view
680 	 * is created. It gets toggled when the 'Tab' key switches focus
681 	 * between parent and child.
682 	 * The flag indicates whether focus should be passed on to our child
683 	 * view if this parent view gets picked for focus after another parent
684 	 * view was closed. This prevents child views from losing focus in such
685 	 * situations.
686 	 */
687 	int focus_child;
688 
689 	enum tog_view_mode mode;
690 	/* type-specific state */
691 	enum tog_view_type type;
692 	union {
693 		struct tog_diff_view_state diff;
694 		struct tog_log_view_state log;
695 		struct tog_blame_view_state blame;
696 		struct tog_tree_view_state tree;
697 		struct tog_ref_view_state ref;
698 		struct tog_help_view_state help;
699 	} state;
700 
701 	const struct got_error *(*show)(struct tog_view *);
702 	const struct got_error *(*input)(struct tog_view **,
703 	    struct tog_view *, int);
704 	const struct got_error *(*reset)(struct tog_view *);
705 	const struct got_error *(*resize)(struct tog_view *, int);
706 	const struct got_error *(*close)(struct tog_view *);
707 
708 	const struct got_error *(*search_start)(struct tog_view *);
709 	const struct got_error *(*search_next)(struct tog_view *);
710 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
711 	    int **, int **, int **, int **);
712 	int search_started;
713 	int searching;
714 #define TOG_SEARCH_FORWARD	1
715 #define TOG_SEARCH_BACKWARD	2
716 	int search_next_done;
717 #define TOG_SEARCH_HAVE_MORE	1
718 #define TOG_SEARCH_NO_MORE	2
719 #define TOG_SEARCH_HAVE_NONE	3
720 	regex_t regex;
721 	regmatch_t regmatch;
722 	const char *action;
723 };
724 
725 static const struct got_error *open_diff_view(struct tog_view *,
726     struct got_object_id *, struct got_object_id *,
727     const char *, const char *, int, int, int, struct tog_view *,
728     struct got_repository *);
729 static const struct got_error *show_diff_view(struct tog_view *);
730 static const struct got_error *input_diff_view(struct tog_view **,
731     struct tog_view *, int);
732 static const struct got_error *reset_diff_view(struct tog_view *);
733 static const struct got_error* close_diff_view(struct tog_view *);
734 static const struct got_error *search_start_diff_view(struct tog_view *);
735 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
736     size_t *, int **, int **, int **, int **);
737 static const struct got_error *search_next_view_match(struct tog_view *);
738 
739 static const struct got_error *open_log_view(struct tog_view *,
740     struct got_object_id *, struct got_repository *,
741     const char *, const char *, int, struct got_worktree *);
742 static const struct got_error * show_log_view(struct tog_view *);
743 static const struct got_error *input_log_view(struct tog_view **,
744     struct tog_view *, int);
745 static const struct got_error *resize_log_view(struct tog_view *, int);
746 static const struct got_error *close_log_view(struct tog_view *);
747 static const struct got_error *search_start_log_view(struct tog_view *);
748 static const struct got_error *search_next_log_view(struct tog_view *);
749 
750 static const struct got_error *open_blame_view(struct tog_view *, char *,
751     struct got_object_id *, struct got_repository *);
752 static const struct got_error *show_blame_view(struct tog_view *);
753 static const struct got_error *input_blame_view(struct tog_view **,
754     struct tog_view *, int);
755 static const struct got_error *reset_blame_view(struct tog_view *);
756 static const struct got_error *close_blame_view(struct tog_view *);
757 static const struct got_error *search_start_blame_view(struct tog_view *);
758 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
759     size_t *, int **, int **, int **, int **);
760 
761 static const struct got_error *open_tree_view(struct tog_view *,
762     struct got_object_id *, const char *, struct got_repository *);
763 static const struct got_error *show_tree_view(struct tog_view *);
764 static const struct got_error *input_tree_view(struct tog_view **,
765     struct tog_view *, int);
766 static const struct got_error *close_tree_view(struct tog_view *);
767 static const struct got_error *search_start_tree_view(struct tog_view *);
768 static const struct got_error *search_next_tree_view(struct tog_view *);
769 
770 static const struct got_error *open_ref_view(struct tog_view *,
771     struct got_repository *);
772 static const struct got_error *show_ref_view(struct tog_view *);
773 static const struct got_error *input_ref_view(struct tog_view **,
774     struct tog_view *, int);
775 static const struct got_error *close_ref_view(struct tog_view *);
776 static const struct got_error *search_start_ref_view(struct tog_view *);
777 static const struct got_error *search_next_ref_view(struct tog_view *);
778 
779 static const struct got_error *open_help_view(struct tog_view *,
780     struct tog_view *);
781 static const struct got_error *show_help_view(struct tog_view *);
782 static const struct got_error *input_help_view(struct tog_view **,
783     struct tog_view *, int);
784 static const struct got_error *reset_help_view(struct tog_view *);
785 static const struct got_error* close_help_view(struct tog_view *);
786 static const struct got_error *search_start_help_view(struct tog_view *);
787 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
788     size_t *, int **, int **, int **, int **);
789 
790 static volatile sig_atomic_t tog_sigwinch_received;
791 static volatile sig_atomic_t tog_sigpipe_received;
792 static volatile sig_atomic_t tog_sigcont_received;
793 static volatile sig_atomic_t tog_sigint_received;
794 static volatile sig_atomic_t tog_sigterm_received;
795 
796 static void
797 tog_sigwinch(int signo)
798 {
799 	tog_sigwinch_received = 1;
800 }
801 
802 static void
803 tog_sigpipe(int signo)
804 {
805 	tog_sigpipe_received = 1;
806 }
807 
808 static void
809 tog_sigcont(int signo)
810 {
811 	tog_sigcont_received = 1;
812 }
813 
814 static void
815 tog_sigint(int signo)
816 {
817 	tog_sigint_received = 1;
818 }
819 
820 static void
821 tog_sigterm(int signo)
822 {
823 	tog_sigterm_received = 1;
824 }
825 
826 static int
827 tog_fatal_signal_received(void)
828 {
829 	return (tog_sigpipe_received ||
830 	    tog_sigint_received || tog_sigterm_received);
831 }
832 
833 static const struct got_error *
834 view_close(struct tog_view *view)
835 {
836 	const struct got_error *err = NULL, *child_err = NULL;
837 
838 	if (view->child) {
839 		child_err = view_close(view->child);
840 		view->child = NULL;
841 	}
842 	if (view->close)
843 		err = view->close(view);
844 	if (view->panel)
845 		del_panel(view->panel);
846 	if (view->window)
847 		delwin(view->window);
848 	free(view);
849 	return err ? err : child_err;
850 }
851 
852 static struct tog_view *
853 view_open(int nlines, int ncols, int begin_y, int begin_x,
854     enum tog_view_type type)
855 {
856 	struct tog_view *view = calloc(1, sizeof(*view));
857 
858 	if (view == NULL)
859 		return NULL;
860 
861 	view->type = type;
862 	view->lines = LINES;
863 	view->cols = COLS;
864 	view->nlines = nlines ? nlines : LINES - begin_y;
865 	view->ncols = ncols ? ncols : COLS - begin_x;
866 	view->begin_y = begin_y;
867 	view->begin_x = begin_x;
868 	view->window = newwin(nlines, ncols, begin_y, begin_x);
869 	if (view->window == NULL) {
870 		view_close(view);
871 		return NULL;
872 	}
873 	view->panel = new_panel(view->window);
874 	if (view->panel == NULL ||
875 	    set_panel_userptr(view->panel, view) != OK) {
876 		view_close(view);
877 		return NULL;
878 	}
879 
880 	keypad(view->window, TRUE);
881 	return view;
882 }
883 
884 static int
885 view_split_begin_x(int begin_x)
886 {
887 	if (begin_x > 0 || COLS < 120)
888 		return 0;
889 	return (COLS - MAX(COLS / 2, 80));
890 }
891 
892 /* XXX Stub till we decide what to do. */
893 static int
894 view_split_begin_y(int lines)
895 {
896 	return lines * HSPLIT_SCALE;
897 }
898 
899 static const struct got_error *view_resize(struct tog_view *);
900 
901 static const struct got_error *
902 view_splitscreen(struct tog_view *view)
903 {
904 	const struct got_error *err = NULL;
905 
906 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
907 		if (view->resized_y && view->resized_y < view->lines)
908 			view->begin_y = view->resized_y;
909 		else
910 			view->begin_y = view_split_begin_y(view->nlines);
911 		view->begin_x = 0;
912 	} else if (!view->resized) {
913 		if (view->resized_x && view->resized_x < view->cols - 1 &&
914 		    view->cols > 119)
915 			view->begin_x = view->resized_x;
916 		else
917 			view->begin_x = view_split_begin_x(0);
918 		view->begin_y = 0;
919 	}
920 	view->nlines = LINES - view->begin_y;
921 	view->ncols = COLS - view->begin_x;
922 	view->lines = LINES;
923 	view->cols = COLS;
924 	err = view_resize(view);
925 	if (err)
926 		return err;
927 
928 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
929 		view->parent->nlines = view->begin_y;
930 
931 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
932 		return got_error_from_errno("mvwin");
933 
934 	return NULL;
935 }
936 
937 static const struct got_error *
938 view_fullscreen(struct tog_view *view)
939 {
940 	const struct got_error *err = NULL;
941 
942 	view->begin_x = 0;
943 	view->begin_y = view->resized ? view->begin_y : 0;
944 	view->nlines = view->resized ? view->nlines : LINES;
945 	view->ncols = COLS;
946 	view->lines = LINES;
947 	view->cols = COLS;
948 	err = view_resize(view);
949 	if (err)
950 		return err;
951 
952 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
953 		return got_error_from_errno("mvwin");
954 
955 	return NULL;
956 }
957 
958 static int
959 view_is_parent_view(struct tog_view *view)
960 {
961 	return view->parent == NULL;
962 }
963 
964 static int
965 view_is_splitscreen(struct tog_view *view)
966 {
967 	return view->begin_x > 0 || view->begin_y > 0;
968 }
969 
970 static int
971 view_is_fullscreen(struct tog_view *view)
972 {
973 	return view->nlines == LINES && view->ncols == COLS;
974 }
975 
976 static int
977 view_is_hsplit_top(struct tog_view *view)
978 {
979 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
980 	    view_is_splitscreen(view->child);
981 }
982 
983 static void
984 view_border(struct tog_view *view)
985 {
986 	PANEL *panel;
987 	const struct tog_view *view_above;
988 
989 	if (view->parent)
990 		return view_border(view->parent);
991 
992 	panel = panel_above(view->panel);
993 	if (panel == NULL)
994 		return;
995 
996 	view_above = panel_userptr(panel);
997 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
998 		mvwhline(view->window, view_above->begin_y - 1,
999 		    view->begin_x, ACS_HLINE, view->ncols);
1000 	else
1001 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
1002 		    ACS_VLINE, view->nlines);
1003 }
1004 
1005 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1006 static const struct got_error *request_log_commits(struct tog_view *);
1007 static const struct got_error *offset_selection_down(struct tog_view *);
1008 static void offset_selection_up(struct tog_view *);
1009 static void view_get_split(struct tog_view *, int *, int *);
1010 
1011 static const struct got_error *
1012 view_resize(struct tog_view *view)
1013 {
1014 	const struct got_error	*err = NULL;
1015 	int			 dif, nlines, ncols;
1016 
1017 	dif = LINES - view->lines;  /* line difference */
1018 
1019 	if (view->lines > LINES)
1020 		nlines = view->nlines - (view->lines - LINES);
1021 	else
1022 		nlines = view->nlines + (LINES - view->lines);
1023 	if (view->cols > COLS)
1024 		ncols = view->ncols - (view->cols - COLS);
1025 	else
1026 		ncols = view->ncols + (COLS - view->cols);
1027 
1028 	if (view->child) {
1029 		int hs = view->child->begin_y;
1030 
1031 		if (!view_is_fullscreen(view))
1032 			view->child->begin_x = view_split_begin_x(view->begin_x);
1033 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1034 		    view->child->begin_x == 0) {
1035 			ncols = COLS;
1036 
1037 			view_fullscreen(view->child);
1038 			if (view->child->focussed)
1039 				show_panel(view->child->panel);
1040 			else
1041 				show_panel(view->panel);
1042 		} else {
1043 			ncols = view->child->begin_x;
1044 
1045 			view_splitscreen(view->child);
1046 			show_panel(view->child->panel);
1047 		}
1048 		/*
1049 		 * XXX This is ugly and needs to be moved into the above
1050 		 * logic but "works" for now and my attempts at moving it
1051 		 * break either 'tab' or 'F' key maps in horizontal splits.
1052 		 */
1053 		if (hs) {
1054 			err = view_splitscreen(view->child);
1055 			if (err)
1056 				return err;
1057 			if (dif < 0) { /* top split decreased */
1058 				err = offset_selection_down(view);
1059 				if (err)
1060 					return err;
1061 			}
1062 			view_border(view);
1063 			update_panels();
1064 			doupdate();
1065 			show_panel(view->child->panel);
1066 			nlines = view->nlines;
1067 		}
1068 	} else if (view->parent == NULL)
1069 		ncols = COLS;
1070 
1071 	if (view->resize && dif > 0) {
1072 		err = view->resize(view, dif);
1073 		if (err)
1074 			return err;
1075 	}
1076 
1077 	if (wresize(view->window, nlines, ncols) == ERR)
1078 		return got_error_from_errno("wresize");
1079 	if (replace_panel(view->panel, view->window) == ERR)
1080 		return got_error_from_errno("replace_panel");
1081 	wclear(view->window);
1082 
1083 	view->nlines = nlines;
1084 	view->ncols = ncols;
1085 	view->lines = LINES;
1086 	view->cols = COLS;
1087 
1088 	return NULL;
1089 }
1090 
1091 static const struct got_error *
1092 resize_log_view(struct tog_view *view, int increase)
1093 {
1094 	struct tog_log_view_state	*s = &view->state.log;
1095 	const struct got_error		*err = NULL;
1096 	int				 n = 0;
1097 
1098 	if (s->selected_entry)
1099 		n = s->selected_entry->idx + view->lines - s->selected;
1100 
1101 	/*
1102 	 * Request commits to account for the increased
1103 	 * height so we have enough to populate the view.
1104 	 */
1105 	if (s->commits->ncommits < n) {
1106 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1107 		err = request_log_commits(view);
1108 	}
1109 
1110 	return err;
1111 }
1112 
1113 static void
1114 view_adjust_offset(struct tog_view *view, int n)
1115 {
1116 	if (n == 0)
1117 		return;
1118 
1119 	if (view->parent && view->parent->offset) {
1120 		if (view->parent->offset + n >= 0)
1121 			view->parent->offset += n;
1122 		else
1123 			view->parent->offset = 0;
1124 	} else if (view->offset) {
1125 		if (view->offset - n >= 0)
1126 			view->offset -= n;
1127 		else
1128 			view->offset = 0;
1129 	}
1130 }
1131 
1132 static const struct got_error *
1133 view_resize_split(struct tog_view *view, int resize)
1134 {
1135 	const struct got_error	*err = NULL;
1136 	struct tog_view		*v = NULL;
1137 
1138 	if (view->parent)
1139 		v = view->parent;
1140 	else
1141 		v = view;
1142 
1143 	if (!v->child || !view_is_splitscreen(v->child))
1144 		return NULL;
1145 
1146 	v->resized = v->child->resized = resize;  /* lock for resize event */
1147 
1148 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1149 		if (v->child->resized_y)
1150 			v->child->begin_y = v->child->resized_y;
1151 		if (view->parent)
1152 			v->child->begin_y -= resize;
1153 		else
1154 			v->child->begin_y += resize;
1155 		if (v->child->begin_y < 3) {
1156 			view->count = 0;
1157 			v->child->begin_y = 3;
1158 		} else if (v->child->begin_y > LINES - 1) {
1159 			view->count = 0;
1160 			v->child->begin_y = LINES - 1;
1161 		}
1162 		v->ncols = COLS;
1163 		v->child->ncols = COLS;
1164 		view_adjust_offset(view, resize);
1165 		err = view_init_hsplit(v, v->child->begin_y);
1166 		if (err)
1167 			return err;
1168 		v->child->resized_y = v->child->begin_y;
1169 	} else {
1170 		if (v->child->resized_x)
1171 			v->child->begin_x = v->child->resized_x;
1172 		if (view->parent)
1173 			v->child->begin_x -= resize;
1174 		else
1175 			v->child->begin_x += resize;
1176 		if (v->child->begin_x < 11) {
1177 			view->count = 0;
1178 			v->child->begin_x = 11;
1179 		} else if (v->child->begin_x > COLS - 1) {
1180 			view->count = 0;
1181 			v->child->begin_x = COLS - 1;
1182 		}
1183 		v->child->resized_x = v->child->begin_x;
1184 	}
1185 
1186 	v->child->mode = v->mode;
1187 	v->child->nlines = v->lines - v->child->begin_y;
1188 	v->child->ncols = v->cols - v->child->begin_x;
1189 	v->focus_child = 1;
1190 
1191 	err = view_fullscreen(v);
1192 	if (err)
1193 		return err;
1194 	err = view_splitscreen(v->child);
1195 	if (err)
1196 		return err;
1197 
1198 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1199 		err = offset_selection_down(v->child);
1200 		if (err)
1201 			return err;
1202 	}
1203 
1204 	if (v->resize)
1205 		err = v->resize(v, 0);
1206 	else if (v->child->resize)
1207 		err = v->child->resize(v->child, 0);
1208 
1209 	v->resized = v->child->resized = 0;
1210 
1211 	return err;
1212 }
1213 
1214 static void
1215 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1216 {
1217 	struct tog_view *v = src->child ? src->child : src;
1218 
1219 	dst->resized_x = v->resized_x;
1220 	dst->resized_y = v->resized_y;
1221 }
1222 
1223 static const struct got_error *
1224 view_close_child(struct tog_view *view)
1225 {
1226 	const struct got_error *err = NULL;
1227 
1228 	if (view->child == NULL)
1229 		return NULL;
1230 
1231 	err = view_close(view->child);
1232 	view->child = NULL;
1233 	return err;
1234 }
1235 
1236 static const struct got_error *
1237 view_set_child(struct tog_view *view, struct tog_view *child)
1238 {
1239 	const struct got_error *err = NULL;
1240 
1241 	view->child = child;
1242 	child->parent = view;
1243 
1244 	err = view_resize(view);
1245 	if (err)
1246 		return err;
1247 
1248 	if (view->child->resized_x || view->child->resized_y)
1249 		err = view_resize_split(view, 0);
1250 
1251 	return err;
1252 }
1253 
1254 static const struct got_error *view_dispatch_request(struct tog_view **,
1255     struct tog_view *, enum tog_view_type, int, int);
1256 
1257 static const struct got_error *
1258 view_request_new(struct tog_view **requested, struct tog_view *view,
1259     enum tog_view_type request)
1260 {
1261 	struct tog_view		*new_view = NULL;
1262 	const struct got_error	*err;
1263 	int			 y = 0, x = 0;
1264 
1265 	*requested = NULL;
1266 
1267 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1268 		view_get_split(view, &y, &x);
1269 
1270 	err = view_dispatch_request(&new_view, view, request, y, x);
1271 	if (err)
1272 		return err;
1273 
1274 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1275 	    request != TOG_VIEW_HELP) {
1276 		err = view_init_hsplit(view, y);
1277 		if (err)
1278 			return err;
1279 	}
1280 
1281 	view->focussed = 0;
1282 	new_view->focussed = 1;
1283 	new_view->mode = view->mode;
1284 	new_view->nlines = request == TOG_VIEW_HELP ?
1285 	    view->lines : view->lines - y;
1286 
1287 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1288 		view_transfer_size(new_view, view);
1289 		err = view_close_child(view);
1290 		if (err)
1291 			return err;
1292 		err = view_set_child(view, new_view);
1293 		if (err)
1294 			return err;
1295 		view->focus_child = 1;
1296 	} else
1297 		*requested = new_view;
1298 
1299 	return NULL;
1300 }
1301 
1302 static void
1303 tog_resizeterm(void)
1304 {
1305 	int cols, lines;
1306 	struct winsize size;
1307 
1308 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1309 		cols = 80;     /* Default */
1310 		lines = 24;
1311 	} else {
1312 		cols = size.ws_col;
1313 		lines = size.ws_row;
1314 	}
1315 	resize_term(lines, cols);
1316 }
1317 
1318 static const struct got_error *
1319 view_search_start(struct tog_view *view, int fast_refresh)
1320 {
1321 	const struct got_error *err = NULL;
1322 	struct tog_view *v = view;
1323 	char pattern[1024];
1324 	int ret;
1325 
1326 	if (view->search_started) {
1327 		regfree(&view->regex);
1328 		view->searching = 0;
1329 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1330 	}
1331 	view->search_started = 0;
1332 
1333 	if (view->nlines < 1)
1334 		return NULL;
1335 
1336 	if (view_is_hsplit_top(view))
1337 		v = view->child;
1338 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1339 		v = view->parent;
1340 
1341 	if (tog_io.input_str != NULL) {
1342 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
1343 		    sizeof(pattern))
1344 			return got_error(GOT_ERR_NO_SPACE);
1345 	} else {
1346 		mvwaddstr(v->window, v->nlines - 1, 0, "/");
1347 		wclrtoeol(v->window);
1348 		nodelay(v->window, FALSE);  /* block for search term input */
1349 		nocbreak();
1350 		echo();
1351 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
1352 		wrefresh(v->window);
1353 		cbreak();
1354 		noecho();
1355 		nodelay(v->window, TRUE);
1356 		if (!fast_refresh && !using_mock_io)
1357 			halfdelay(10);
1358 		if (ret == ERR)
1359 			return NULL;
1360 	}
1361 
1362 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1363 		err = view->search_start(view);
1364 		if (err) {
1365 			regfree(&view->regex);
1366 			return err;
1367 		}
1368 		view->search_started = 1;
1369 		view->searching = TOG_SEARCH_FORWARD;
1370 		view->search_next_done = 0;
1371 		view->search_next(view);
1372 	}
1373 
1374 	return NULL;
1375 }
1376 
1377 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1378 static const struct got_error *
1379 switch_split(struct tog_view *view)
1380 {
1381 	const struct got_error	*err = NULL;
1382 	struct tog_view		*v = NULL;
1383 
1384 	if (view->parent)
1385 		v = view->parent;
1386 	else
1387 		v = view;
1388 
1389 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1390 		v->mode = TOG_VIEW_SPLIT_VERT;
1391 	else
1392 		v->mode = TOG_VIEW_SPLIT_HRZN;
1393 
1394 	if (!v->child)
1395 		return NULL;
1396 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1397 		v->mode = TOG_VIEW_SPLIT_NONE;
1398 
1399 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1400 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1401 		v->child->begin_y = v->child->resized_y;
1402 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1403 		v->child->begin_x = v->child->resized_x;
1404 
1405 
1406 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1407 		v->ncols = COLS;
1408 		v->child->ncols = COLS;
1409 		v->child->nscrolled = LINES - v->child->nlines;
1410 
1411 		err = view_init_hsplit(v, v->child->begin_y);
1412 		if (err)
1413 			return err;
1414 	}
1415 	v->child->mode = v->mode;
1416 	v->child->nlines = v->lines - v->child->begin_y;
1417 	v->focus_child = 1;
1418 
1419 	err = view_fullscreen(v);
1420 	if (err)
1421 		return err;
1422 	err = view_splitscreen(v->child);
1423 	if (err)
1424 		return err;
1425 
1426 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1427 		v->mode = TOG_VIEW_SPLIT_VERT;
1428 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1429 		err = offset_selection_down(v);
1430 		if (err)
1431 			return err;
1432 		err = offset_selection_down(v->child);
1433 		if (err)
1434 			return err;
1435 	} else {
1436 		offset_selection_up(v);
1437 		offset_selection_up(v->child);
1438 	}
1439 	if (v->resize)
1440 		err = v->resize(v, 0);
1441 	else if (v->child->resize)
1442 		err = v->child->resize(v->child, 0);
1443 
1444 	return err;
1445 }
1446 
1447 /*
1448  * Strip trailing whitespace from str starting at byte *n;
1449  * if *n < 0, use strlen(str). Return new str length in *n.
1450  */
1451 static void
1452 strip_trailing_ws(char *str, int *n)
1453 {
1454 	size_t x = *n;
1455 
1456 	if (str == NULL || *str == '\0')
1457 		return;
1458 
1459 	if (x < 0)
1460 		x = strlen(str);
1461 
1462 	while (x-- > 0 && isspace((unsigned char)str[x]))
1463 		str[x] = '\0';
1464 
1465 	*n = x + 1;
1466 }
1467 
1468 /*
1469  * Extract visible substring of line y from the curses screen
1470  * and strip trailing whitespace. If vline is set, overwrite
1471  * line[vline] with '|' because the ACS_VLINE character is
1472  * written out as 'x'. Write the line to file f.
1473  */
1474 static const struct got_error *
1475 view_write_line(FILE *f, int y, int vline)
1476 {
1477 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1478 	int	r, w;
1479 
1480 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1481 	if (r == ERR)
1482 		return got_error_fmt(GOT_ERR_RANGE,
1483 		    "failed to extract line %d", y);
1484 
1485 	/*
1486 	 * In some views, lines are padded with blanks to COLS width.
1487 	 * Strip them so we can diff without the -b flag when testing.
1488 	 */
1489 	strip_trailing_ws(line, &r);
1490 
1491 	if (vline > 0)
1492 		line[vline] = '|';
1493 
1494 	w = fprintf(f, "%s\n", line);
1495 	if (w != r + 1)		/* \n */
1496 		return got_ferror(f, GOT_ERR_IO);
1497 
1498 	return NULL;
1499 }
1500 
1501 /*
1502  * Capture the visible curses screen by writing each line to the
1503  * file at the path set via the TOG_SCR_DUMP environment variable.
1504  */
1505 static const struct got_error *
1506 screendump(struct tog_view *view)
1507 {
1508 	const struct got_error	*err;
1509 	int			 i;
1510 
1511 	err = got_opentemp_truncate(tog_io.sdump);
1512 	if (err)
1513 		return err;
1514 
1515 	if ((view->child && view->child->begin_x) ||
1516 	    (view->parent && view->begin_x)) {
1517 		int ncols = view->child ? view->ncols : view->parent->ncols;
1518 
1519 		/* vertical splitscreen */
1520 		for (i = 0; i < view->nlines; ++i) {
1521 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1522 			if (err)
1523 				goto done;
1524 		}
1525 	} else {
1526 		int hline = 0;
1527 
1528 		/* fullscreen or horizontal splitscreen */
1529 		if ((view->child && view->child->begin_y) ||
1530 		    (view->parent && view->begin_y))	/* hsplit */
1531 			hline = view->child ?
1532 			    view->child->begin_y : view->begin_y;
1533 
1534 		for (i = 0; i < view->lines; i++) {
1535 			if (hline && i == hline - 1) {
1536 				int c;
1537 
1538 				/* ACS_HLINE writes out as 'q', overwrite it */
1539 				for (c = 0; c < view->cols; ++c)
1540 					fputc('-', tog_io.sdump);
1541 				fputc('\n', tog_io.sdump);
1542 				continue;
1543 			}
1544 
1545 			err = view_write_line(tog_io.sdump, i, 0);
1546 			if (err)
1547 				goto done;
1548 		}
1549 	}
1550 
1551 done:
1552 	return err;
1553 }
1554 
1555 /*
1556  * Compute view->count from numeric input. Assign total to view->count and
1557  * return first non-numeric key entered.
1558  */
1559 static int
1560 get_compound_key(struct tog_view *view, int c)
1561 {
1562 	struct tog_view	*v = view;
1563 	int		 x, n = 0;
1564 
1565 	if (view_is_hsplit_top(view))
1566 		v = view->child;
1567 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1568 		v = view->parent;
1569 
1570 	view->count = 0;
1571 	cbreak();  /* block for input */
1572 	nodelay(view->window, FALSE);
1573 	wmove(v->window, v->nlines - 1, 0);
1574 	wclrtoeol(v->window);
1575 	waddch(v->window, ':');
1576 
1577 	do {
1578 		x = getcurx(v->window);
1579 		if (x != ERR && x < view->ncols) {
1580 			waddch(v->window, c);
1581 			wrefresh(v->window);
1582 		}
1583 
1584 		/*
1585 		 * Don't overflow. Max valid request should be the greatest
1586 		 * between the longest and total lines; cap at 10 million.
1587 		 */
1588 		if (n >= 9999999)
1589 			n = 9999999;
1590 		else
1591 			n = n * 10 + (c - '0');
1592 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1593 
1594 	if (c == 'G' || c == 'g') {	/* nG key map */
1595 		view->gline = view->hiline = n;
1596 		n = 0;
1597 		c = 0;
1598 	}
1599 
1600 	/* Massage excessive or inapplicable values at the input handler. */
1601 	view->count = n;
1602 
1603 	return c;
1604 }
1605 
1606 static void
1607 action_report(struct tog_view *view)
1608 {
1609 	struct tog_view *v = view;
1610 
1611 	if (view_is_hsplit_top(view))
1612 		v = view->child;
1613 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1614 		v = view->parent;
1615 
1616 	wmove(v->window, v->nlines - 1, 0);
1617 	wclrtoeol(v->window);
1618 	wprintw(v->window, ":%s", view->action);
1619 	wrefresh(v->window);
1620 
1621 	/*
1622 	 * Clear action status report. Only clear in blame view
1623 	 * once annotating is complete, otherwise it's too fast.
1624 	 */
1625 	if (view->type == TOG_VIEW_BLAME) {
1626 		if (view->state.blame.blame_complete)
1627 			view->action = NULL;
1628 	} else
1629 		view->action = NULL;
1630 }
1631 
1632 /*
1633  * Read the next line from the test script and assign
1634  * key instruction to *ch. If at EOF, set the *done flag.
1635  */
1636 static const struct got_error *
1637 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1638 {
1639 	const struct got_error	*err = NULL;
1640 	char			*line = NULL;
1641 	size_t			 linesz = 0;
1642 	ssize_t			 n;
1643 
1644 
1645 	if (view->count && --view->count) {
1646 		*ch = view->ch;
1647 		return NULL;
1648 	} else
1649 		*ch = -1;
1650 
1651 	if ((n = getline(&line, &linesz, script)) == -1) {
1652 		if (feof(script)) {
1653 			*done = 1;
1654 			goto done;
1655 		} else {
1656 			err = got_ferror(script, GOT_ERR_IO);
1657 			goto done;
1658 		}
1659 	}
1660 
1661 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1662 		tog_io.wait_for_ui = 1;
1663 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1664 		*ch = KEY_ENTER;
1665 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1666 		*ch = KEY_RIGHT;
1667 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1668 		*ch = KEY_LEFT;
1669 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1670 		*ch = KEY_DOWN;
1671 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1672 		*ch = KEY_UP;
1673 	else if (strncasecmp(line, "TAB", 3) == 0)
1674 		*ch = '\t';
1675 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1676 		*ch = TOG_KEY_SCRDUMP;
1677 	else if (isdigit((unsigned char)*line)) {
1678 		char *t = line;
1679 
1680 		while (isdigit((unsigned char)*t))
1681 			++t;
1682 		view->ch = *ch = *t;
1683 		*t = '\0';
1684 		/* ignore error, view->count is 0 if instruction is invalid */
1685 		view->count = strtonum(line, 0, INT_MAX, NULL);
1686 	} else {
1687 		*ch = *line;
1688 		if (n > 2 && (*ch == '/' || *ch == '&')) {
1689 			/* skip leading keymap and trim trailing newline */
1690 			tog_io.input_str = strndup(line + 1, n - 2);
1691 			if (tog_io.input_str == NULL) {
1692 				err = got_error_from_errno("strndup");
1693 				goto done;
1694 			}
1695 		}
1696 	}
1697 
1698 done:
1699 	free(line);
1700 	return err;
1701 }
1702 
1703 static const struct got_error *
1704 view_input(struct tog_view **new, int *done, struct tog_view *view,
1705     struct tog_view_list_head *views, int fast_refresh)
1706 {
1707 	const struct got_error *err = NULL;
1708 	struct tog_view *v;
1709 	int ch, errcode;
1710 
1711 	*new = NULL;
1712 
1713 	if (view->action)
1714 		action_report(view);
1715 
1716 	/* Clear "no matches" indicator. */
1717 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1718 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1719 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1720 		view->count = 0;
1721 	}
1722 
1723 	if (view->searching && !view->search_next_done) {
1724 		errcode = pthread_mutex_unlock(&tog_mutex);
1725 		if (errcode)
1726 			return got_error_set_errno(errcode,
1727 			    "pthread_mutex_unlock");
1728 		sched_yield();
1729 		errcode = pthread_mutex_lock(&tog_mutex);
1730 		if (errcode)
1731 			return got_error_set_errno(errcode,
1732 			    "pthread_mutex_lock");
1733 		view->search_next(view);
1734 		return NULL;
1735 	}
1736 
1737 	/* Allow threads to make progress while we are waiting for input. */
1738 	errcode = pthread_mutex_unlock(&tog_mutex);
1739 	if (errcode)
1740 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1741 
1742 	if (using_mock_io) {
1743 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1744 		if (err) {
1745 			errcode = pthread_mutex_lock(&tog_mutex);
1746 			return err;
1747 		}
1748 	} else if (view->count && --view->count) {
1749 		cbreak();
1750 		nodelay(view->window, TRUE);
1751 		ch = wgetch(view->window);
1752 		/* let C-g or backspace abort unfinished count */
1753 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1754 			view->count = 0;
1755 		else
1756 			ch = view->ch;
1757 	} else {
1758 		ch = wgetch(view->window);
1759 		if (ch >= '1' && ch  <= '9')
1760 			view->ch = ch = get_compound_key(view, ch);
1761 	}
1762 	if (view->hiline && ch != ERR && ch != 0)
1763 		view->hiline = 0;  /* key pressed, clear line highlight */
1764 	nodelay(view->window, TRUE);
1765 	errcode = pthread_mutex_lock(&tog_mutex);
1766 	if (errcode)
1767 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1768 
1769 	if (tog_sigwinch_received || tog_sigcont_received) {
1770 		tog_resizeterm();
1771 		tog_sigwinch_received = 0;
1772 		tog_sigcont_received = 0;
1773 		TAILQ_FOREACH(v, views, entry) {
1774 			err = view_resize(v);
1775 			if (err)
1776 				return err;
1777 			err = v->input(new, v, KEY_RESIZE);
1778 			if (err)
1779 				return err;
1780 			if (v->child) {
1781 				err = view_resize(v->child);
1782 				if (err)
1783 					return err;
1784 				err = v->child->input(new, v->child,
1785 				    KEY_RESIZE);
1786 				if (err)
1787 					return err;
1788 				if (v->child->resized_x || v->child->resized_y) {
1789 					err = view_resize_split(v, 0);
1790 					if (err)
1791 						return err;
1792 				}
1793 			}
1794 		}
1795 	}
1796 
1797 	switch (ch) {
1798 	case '?':
1799 	case 'H':
1800 	case KEY_F(1):
1801 		if (view->type == TOG_VIEW_HELP)
1802 			err = view->reset(view);
1803 		else
1804 			err = view_request_new(new, view, TOG_VIEW_HELP);
1805 		break;
1806 	case '\t':
1807 		view->count = 0;
1808 		if (view->child) {
1809 			view->focussed = 0;
1810 			view->child->focussed = 1;
1811 			view->focus_child = 1;
1812 		} else if (view->parent) {
1813 			view->focussed = 0;
1814 			view->parent->focussed = 1;
1815 			view->parent->focus_child = 0;
1816 			if (!view_is_splitscreen(view)) {
1817 				if (view->parent->resize) {
1818 					err = view->parent->resize(view->parent,
1819 					    0);
1820 					if (err)
1821 						return err;
1822 				}
1823 				offset_selection_up(view->parent);
1824 				err = view_fullscreen(view->parent);
1825 				if (err)
1826 					return err;
1827 			}
1828 		}
1829 		break;
1830 	case 'q':
1831 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1832 			if (view->parent->resize) {
1833 				/* might need more commits to fill fullscreen */
1834 				err = view->parent->resize(view->parent, 0);
1835 				if (err)
1836 					break;
1837 			}
1838 			offset_selection_up(view->parent);
1839 		}
1840 		err = view->input(new, view, ch);
1841 		view->dying = 1;
1842 		break;
1843 	case 'Q':
1844 		*done = 1;
1845 		break;
1846 	case 'F':
1847 		view->count = 0;
1848 		if (view_is_parent_view(view)) {
1849 			if (view->child == NULL)
1850 				break;
1851 			if (view_is_splitscreen(view->child)) {
1852 				view->focussed = 0;
1853 				view->child->focussed = 1;
1854 				err = view_fullscreen(view->child);
1855 			} else {
1856 				err = view_splitscreen(view->child);
1857 				if (!err)
1858 					err = view_resize_split(view, 0);
1859 			}
1860 			if (err)
1861 				break;
1862 			err = view->child->input(new, view->child,
1863 			    KEY_RESIZE);
1864 		} else {
1865 			if (view_is_splitscreen(view)) {
1866 				view->parent->focussed = 0;
1867 				view->focussed = 1;
1868 				err = view_fullscreen(view);
1869 			} else {
1870 				err = view_splitscreen(view);
1871 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1872 					err = view_resize(view->parent);
1873 				if (!err)
1874 					err = view_resize_split(view, 0);
1875 			}
1876 			if (err)
1877 				break;
1878 			err = view->input(new, view, KEY_RESIZE);
1879 		}
1880 		if (err)
1881 			break;
1882 		if (view->resize) {
1883 			err = view->resize(view, 0);
1884 			if (err)
1885 				break;
1886 		}
1887 		if (view->parent) {
1888 			if (view->parent->resize) {
1889 				err = view->parent->resize(view->parent, 0);
1890 				if (err != NULL)
1891 					break;
1892 			}
1893 			err = offset_selection_down(view->parent);
1894 			if (err != NULL)
1895 				break;
1896 		}
1897 		err = offset_selection_down(view);
1898 		break;
1899 	case 'S':
1900 		view->count = 0;
1901 		err = switch_split(view);
1902 		break;
1903 	case '-':
1904 		err = view_resize_split(view, -1);
1905 		break;
1906 	case '+':
1907 		err = view_resize_split(view, 1);
1908 		break;
1909 	case KEY_RESIZE:
1910 		break;
1911 	case '/':
1912 		view->count = 0;
1913 		if (view->search_start)
1914 			view_search_start(view, fast_refresh);
1915 		else
1916 			err = view->input(new, view, ch);
1917 		break;
1918 	case 'N':
1919 	case 'n':
1920 		if (view->search_started && view->search_next) {
1921 			view->searching = (ch == 'n' ?
1922 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1923 			view->search_next_done = 0;
1924 			view->search_next(view);
1925 		} else
1926 			err = view->input(new, view, ch);
1927 		break;
1928 	case 'A':
1929 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1930 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1931 			view->action = "Patience diff algorithm";
1932 		} else {
1933 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1934 			view->action = "Myers diff algorithm";
1935 		}
1936 		TAILQ_FOREACH(v, views, entry) {
1937 			if (v->reset) {
1938 				err = v->reset(v);
1939 				if (err)
1940 					return err;
1941 			}
1942 			if (v->child && v->child->reset) {
1943 				err = v->child->reset(v->child);
1944 				if (err)
1945 					return err;
1946 			}
1947 		}
1948 		break;
1949 	case TOG_KEY_SCRDUMP:
1950 		err = screendump(view);
1951 		break;
1952 	default:
1953 		err = view->input(new, view, ch);
1954 		break;
1955 	}
1956 
1957 	return err;
1958 }
1959 
1960 static int
1961 view_needs_focus_indication(struct tog_view *view)
1962 {
1963 	if (view_is_parent_view(view)) {
1964 		if (view->child == NULL || view->child->focussed)
1965 			return 0;
1966 		if (!view_is_splitscreen(view->child))
1967 			return 0;
1968 	} else if (!view_is_splitscreen(view))
1969 		return 0;
1970 
1971 	return view->focussed;
1972 }
1973 
1974 static const struct got_error *
1975 tog_io_close(void)
1976 {
1977 	const struct got_error *err = NULL;
1978 
1979 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1980 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1981 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1982 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1983 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1984 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1985 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1986 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1987 	if (tog_io.input_str != NULL)
1988 		free(tog_io.input_str);
1989 
1990 	return err;
1991 }
1992 
1993 static const struct got_error *
1994 view_loop(struct tog_view *view)
1995 {
1996 	const struct got_error *err = NULL;
1997 	struct tog_view_list_head views;
1998 	struct tog_view *new_view;
1999 	char *mode;
2000 	int fast_refresh = 10;
2001 	int done = 0, errcode;
2002 
2003 	mode = getenv("TOG_VIEW_SPLIT_MODE");
2004 	if (!mode || !(*mode == 'h' || *mode == 'H'))
2005 		view->mode = TOG_VIEW_SPLIT_VERT;
2006 	else
2007 		view->mode = TOG_VIEW_SPLIT_HRZN;
2008 
2009 	errcode = pthread_mutex_lock(&tog_mutex);
2010 	if (errcode)
2011 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2012 
2013 	TAILQ_INIT(&views);
2014 	TAILQ_INSERT_HEAD(&views, view, entry);
2015 
2016 	view->focussed = 1;
2017 	err = view->show(view);
2018 	if (err)
2019 		return err;
2020 	update_panels();
2021 	doupdate();
2022 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2023 	    !tog_fatal_signal_received()) {
2024 		/* Refresh fast during initialization, then become slower. */
2025 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2026 			halfdelay(10); /* switch to once per second */
2027 
2028 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2029 		if (err)
2030 			break;
2031 
2032 		if (view->dying && view == TAILQ_FIRST(&views) &&
2033 		    TAILQ_NEXT(view, entry) == NULL)
2034 			done = 1;
2035 		if (done) {
2036 			struct tog_view *v;
2037 
2038 			/*
2039 			 * When we quit, scroll the screen up a single line
2040 			 * so we don't lose any information.
2041 			 */
2042 			TAILQ_FOREACH(v, &views, entry) {
2043 				wmove(v->window, 0, 0);
2044 				wdeleteln(v->window);
2045 				wnoutrefresh(v->window);
2046 				if (v->child && !view_is_fullscreen(v)) {
2047 					wmove(v->child->window, 0, 0);
2048 					wdeleteln(v->child->window);
2049 					wnoutrefresh(v->child->window);
2050 				}
2051 			}
2052 			doupdate();
2053 		}
2054 
2055 		if (view->dying) {
2056 			struct tog_view *v, *prev = NULL;
2057 
2058 			if (view_is_parent_view(view))
2059 				prev = TAILQ_PREV(view, tog_view_list_head,
2060 				    entry);
2061 			else if (view->parent)
2062 				prev = view->parent;
2063 
2064 			if (view->parent) {
2065 				view->parent->child = NULL;
2066 				view->parent->focus_child = 0;
2067 				/* Restore fullscreen line height. */
2068 				view->parent->nlines = view->parent->lines;
2069 				err = view_resize(view->parent);
2070 				if (err)
2071 					break;
2072 				/* Make resized splits persist. */
2073 				view_transfer_size(view->parent, view);
2074 			} else
2075 				TAILQ_REMOVE(&views, view, entry);
2076 
2077 			err = view_close(view);
2078 			if (err)
2079 				goto done;
2080 
2081 			view = NULL;
2082 			TAILQ_FOREACH(v, &views, entry) {
2083 				if (v->focussed)
2084 					break;
2085 			}
2086 			if (view == NULL && new_view == NULL) {
2087 				/* No view has focus. Try to pick one. */
2088 				if (prev)
2089 					view = prev;
2090 				else if (!TAILQ_EMPTY(&views)) {
2091 					view = TAILQ_LAST(&views,
2092 					    tog_view_list_head);
2093 				}
2094 				if (view) {
2095 					if (view->focus_child) {
2096 						view->child->focussed = 1;
2097 						view = view->child;
2098 					} else
2099 						view->focussed = 1;
2100 				}
2101 			}
2102 		}
2103 		if (new_view) {
2104 			struct tog_view *v, *t;
2105 			/* Only allow one parent view per type. */
2106 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2107 				if (v->type != new_view->type)
2108 					continue;
2109 				TAILQ_REMOVE(&views, v, entry);
2110 				err = view_close(v);
2111 				if (err)
2112 					goto done;
2113 				break;
2114 			}
2115 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2116 			view = new_view;
2117 		}
2118 		if (view && !done) {
2119 			if (view_is_parent_view(view)) {
2120 				if (view->child && view->child->focussed)
2121 					view = view->child;
2122 			} else {
2123 				if (view->parent && view->parent->focussed)
2124 					view = view->parent;
2125 			}
2126 			show_panel(view->panel);
2127 			if (view->child && view_is_splitscreen(view->child))
2128 				show_panel(view->child->panel);
2129 			if (view->parent && view_is_splitscreen(view)) {
2130 				err = view->parent->show(view->parent);
2131 				if (err)
2132 					goto done;
2133 			}
2134 			err = view->show(view);
2135 			if (err)
2136 				goto done;
2137 			if (view->child) {
2138 				err = view->child->show(view->child);
2139 				if (err)
2140 					goto done;
2141 			}
2142 			update_panels();
2143 			doupdate();
2144 		}
2145 	}
2146 done:
2147 	while (!TAILQ_EMPTY(&views)) {
2148 		const struct got_error *close_err;
2149 		view = TAILQ_FIRST(&views);
2150 		TAILQ_REMOVE(&views, view, entry);
2151 		close_err = view_close(view);
2152 		if (close_err && err == NULL)
2153 			err = close_err;
2154 	}
2155 
2156 	errcode = pthread_mutex_unlock(&tog_mutex);
2157 	if (errcode && err == NULL)
2158 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2159 
2160 	return err;
2161 }
2162 
2163 __dead static void
2164 usage_log(void)
2165 {
2166 	endwin();
2167 	fprintf(stderr,
2168 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2169 	    getprogname());
2170 	exit(1);
2171 }
2172 
2173 /* Create newly allocated wide-character string equivalent to a byte string. */
2174 static const struct got_error *
2175 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2176 {
2177 	char *vis = NULL;
2178 	const struct got_error *err = NULL;
2179 
2180 	*ws = NULL;
2181 	*wlen = mbstowcs(NULL, s, 0);
2182 	if (*wlen == (size_t)-1) {
2183 		int vislen;
2184 		if (errno != EILSEQ)
2185 			return got_error_from_errno("mbstowcs");
2186 
2187 		/* byte string invalid in current encoding; try to "fix" it */
2188 		err = got_mbsavis(&vis, &vislen, s);
2189 		if (err)
2190 			return err;
2191 		*wlen = mbstowcs(NULL, vis, 0);
2192 		if (*wlen == (size_t)-1) {
2193 			err = got_error_from_errno("mbstowcs"); /* give up */
2194 			goto done;
2195 		}
2196 	}
2197 
2198 	*ws = calloc(*wlen + 1, sizeof(**ws));
2199 	if (*ws == NULL) {
2200 		err = got_error_from_errno("calloc");
2201 		goto done;
2202 	}
2203 
2204 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2205 		err = got_error_from_errno("mbstowcs");
2206 done:
2207 	free(vis);
2208 	if (err) {
2209 		free(*ws);
2210 		*ws = NULL;
2211 		*wlen = 0;
2212 	}
2213 	return err;
2214 }
2215 
2216 static const struct got_error *
2217 expand_tab(char **ptr, const char *src)
2218 {
2219 	char	*dst;
2220 	size_t	 len, n, idx = 0, sz = 0;
2221 
2222 	*ptr = NULL;
2223 	n = len = strlen(src);
2224 	dst = malloc(n + 1);
2225 	if (dst == NULL)
2226 		return got_error_from_errno("malloc");
2227 
2228 	while (idx < len && src[idx]) {
2229 		const char c = src[idx];
2230 
2231 		if (c == '\t') {
2232 			size_t nb = TABSIZE - sz % TABSIZE;
2233 			char *p;
2234 
2235 			p = realloc(dst, n + nb);
2236 			if (p == NULL) {
2237 				free(dst);
2238 				return got_error_from_errno("realloc");
2239 
2240 			}
2241 			dst = p;
2242 			n += nb;
2243 			memset(dst + sz, ' ', nb);
2244 			sz += nb;
2245 		} else
2246 			dst[sz++] = src[idx];
2247 		++idx;
2248 	}
2249 
2250 	dst[sz] = '\0';
2251 	*ptr = dst;
2252 	return NULL;
2253 }
2254 
2255 /*
2256  * Advance at most n columns from wline starting at offset off.
2257  * Return the index to the first character after the span operation.
2258  * Return the combined column width of all spanned wide characters in
2259  * *rcol.
2260  */
2261 static int
2262 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2263 {
2264 	int width, i, cols = 0;
2265 
2266 	if (n == 0) {
2267 		*rcol = cols;
2268 		return off;
2269 	}
2270 
2271 	for (i = off; wline[i] != L'\0'; ++i) {
2272 		if (wline[i] == L'\t')
2273 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2274 		else
2275 			width = wcwidth(wline[i]);
2276 
2277 		if (width == -1) {
2278 			width = 1;
2279 			wline[i] = L'.';
2280 		}
2281 
2282 		if (cols + width > n)
2283 			break;
2284 		cols += width;
2285 	}
2286 
2287 	*rcol = cols;
2288 	return i;
2289 }
2290 
2291 /*
2292  * Format a line for display, ensuring that it won't overflow a width limit.
2293  * With scrolling, the width returned refers to the scrolled version of the
2294  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2295  */
2296 static const struct got_error *
2297 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2298     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2299 {
2300 	const struct got_error *err = NULL;
2301 	int cols;
2302 	wchar_t *wline = NULL;
2303 	char *exstr = NULL;
2304 	size_t wlen;
2305 	int i, scrollx;
2306 
2307 	*wlinep = NULL;
2308 	*widthp = 0;
2309 
2310 	if (expand) {
2311 		err = expand_tab(&exstr, line);
2312 		if (err)
2313 			return err;
2314 	}
2315 
2316 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2317 	free(exstr);
2318 	if (err)
2319 		return err;
2320 
2321 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2322 
2323 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2324 		wline[wlen - 1] = L'\0';
2325 		wlen--;
2326 	}
2327 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2328 		wline[wlen - 1] = L'\0';
2329 		wlen--;
2330 	}
2331 
2332 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2333 	wline[i] = L'\0';
2334 
2335 	if (widthp)
2336 		*widthp = cols;
2337 	if (scrollxp)
2338 		*scrollxp = scrollx;
2339 	if (err)
2340 		free(wline);
2341 	else
2342 		*wlinep = wline;
2343 	return err;
2344 }
2345 
2346 static const struct got_error*
2347 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2348     struct got_object_id *id, struct got_repository *repo)
2349 {
2350 	static const struct got_error *err = NULL;
2351 	struct got_reflist_entry *re;
2352 	char *s;
2353 	const char *name;
2354 
2355 	*refs_str = NULL;
2356 
2357 	if (refs == NULL)
2358 		return NULL;
2359 
2360 	TAILQ_FOREACH(re, refs, entry) {
2361 		struct got_tag_object *tag = NULL;
2362 		struct got_object_id *ref_id;
2363 		int cmp;
2364 
2365 		name = got_ref_get_name(re->ref);
2366 		if (strcmp(name, GOT_REF_HEAD) == 0)
2367 			continue;
2368 		if (strncmp(name, "refs/", 5) == 0)
2369 			name += 5;
2370 		if (strncmp(name, "got/", 4) == 0)
2371 			continue;
2372 		if (strncmp(name, "heads/", 6) == 0)
2373 			name += 6;
2374 		if (strncmp(name, "remotes/", 8) == 0) {
2375 			name += 8;
2376 			s = strstr(name, "/" GOT_REF_HEAD);
2377 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2378 				continue;
2379 		}
2380 		err = got_ref_resolve(&ref_id, repo, re->ref);
2381 		if (err)
2382 			break;
2383 		if (strncmp(name, "tags/", 5) == 0) {
2384 			err = got_object_open_as_tag(&tag, repo, ref_id);
2385 			if (err) {
2386 				if (err->code != GOT_ERR_OBJ_TYPE) {
2387 					free(ref_id);
2388 					break;
2389 				}
2390 				/* Ref points at something other than a tag. */
2391 				err = NULL;
2392 				tag = NULL;
2393 			}
2394 		}
2395 		cmp = got_object_id_cmp(tag ?
2396 		    got_object_tag_get_object_id(tag) : ref_id, id);
2397 		free(ref_id);
2398 		if (tag)
2399 			got_object_tag_close(tag);
2400 		if (cmp != 0)
2401 			continue;
2402 		s = *refs_str;
2403 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2404 		    s ? ", " : "", name) == -1) {
2405 			err = got_error_from_errno("asprintf");
2406 			free(s);
2407 			*refs_str = NULL;
2408 			break;
2409 		}
2410 		free(s);
2411 	}
2412 
2413 	return err;
2414 }
2415 
2416 static const struct got_error *
2417 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2418     int col_tab_align)
2419 {
2420 	char *smallerthan;
2421 
2422 	smallerthan = strchr(author, '<');
2423 	if (smallerthan && smallerthan[1] != '\0')
2424 		author = smallerthan + 1;
2425 	author[strcspn(author, "@>")] = '\0';
2426 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2427 	    col_tab_align, 0);
2428 }
2429 
2430 static const struct got_error *
2431 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2432     const size_t date_display_cols, int author_display_cols)
2433 {
2434 	struct tog_log_view_state *s = &view->state.log;
2435 	const struct got_error *err = NULL;
2436 	struct got_commit_object *commit = entry->commit;
2437 	struct got_object_id *id = entry->id;
2438 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2439 	char *refs_str = NULL;
2440 	char *logmsg0 = NULL, *logmsg = NULL;
2441 	char *author = NULL;
2442 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2443 	int author_width, refstr_width, logmsg_width;
2444 	char *newline, *line = NULL;
2445 	int col, limit, scrollx, logmsg_x;
2446 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2447 	struct tm tm;
2448 	time_t committer_time;
2449 	struct tog_color *tc;
2450 	struct got_reflist_head *refs;
2451 
2452 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2453 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2454 		tog_base_commit.idx = entry->idx;
2455 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2456 		int rc;
2457 
2458 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2459 		if (rc)
2460 			return got_error_set_errno(rc, "pthread_cond_wait");
2461 	}
2462 
2463 	committer_time = got_object_commit_get_committer_time(commit);
2464 	if (gmtime_r(&committer_time, &tm) == NULL)
2465 		return got_error_from_errno("gmtime_r");
2466 	if (strftime(datebuf, sizeof(datebuf), "%F ", &tm) == 0)
2467 		return got_error(GOT_ERR_NO_SPACE);
2468 
2469 	if (avail <= date_display_cols)
2470 		limit = MIN(sizeof(datebuf) - 1, avail);
2471 	else
2472 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2473 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2474 	if (tc)
2475 		wattr_on(view->window,
2476 		    COLOR_PAIR(tc->colorpair), NULL);
2477 	waddnstr(view->window, datebuf, limit);
2478 	if (tc)
2479 		wattr_off(view->window,
2480 		    COLOR_PAIR(tc->colorpair), NULL);
2481 	col = limit;
2482 	if (col > avail)
2483 		goto done;
2484 
2485 	if (avail >= 120) {
2486 		char *id_str;
2487 		err = got_object_id_str(&id_str, id);
2488 		if (err)
2489 			goto done;
2490 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2491 		if (tc)
2492 			wattr_on(view->window,
2493 			    COLOR_PAIR(tc->colorpair), NULL);
2494 		wprintw(view->window, "%.8s ", id_str);
2495 		if (tc)
2496 			wattr_off(view->window,
2497 			    COLOR_PAIR(tc->colorpair), NULL);
2498 		free(id_str);
2499 		col += 9;
2500 		if (col > avail)
2501 			goto done;
2502 	}
2503 
2504 	if (s->use_committer)
2505 		author = strdup(got_object_commit_get_committer(commit));
2506 	else
2507 		author = strdup(got_object_commit_get_author(commit));
2508 	if (author == NULL) {
2509 		err = got_error_from_errno("strdup");
2510 		goto done;
2511 	}
2512 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2513 	if (err)
2514 		goto done;
2515 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2516 	if (tc)
2517 		wattr_on(view->window,
2518 		    COLOR_PAIR(tc->colorpair), NULL);
2519 	waddwstr(view->window, wauthor);
2520 	col += author_width;
2521 	while (col < avail && author_width < author_display_cols + 2) {
2522 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2523 		    author_width == marker_column &&
2524 		    entry->idx == tog_base_commit.idx && !s->limit_view) {
2525 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2526 			if (tc)
2527 				wattr_on(view->window,
2528 				    COLOR_PAIR(tc->colorpair), NULL);
2529 			waddch(view->window, tog_base_commit.marker);
2530 			if (tc)
2531 				wattr_off(view->window,
2532 				    COLOR_PAIR(tc->colorpair), NULL);
2533 		} else
2534 			waddch(view->window, ' ');
2535 		col++;
2536 		author_width++;
2537 	}
2538 	if (tc)
2539 		wattr_off(view->window,
2540 		    COLOR_PAIR(tc->colorpair), NULL);
2541 	if (col > avail)
2542 		goto done;
2543 
2544 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2545 	if (err)
2546 		goto done;
2547 	logmsg = logmsg0;
2548 	while (*logmsg == '\n')
2549 		logmsg++;
2550 	newline = strchr(logmsg, '\n');
2551 	if (newline)
2552 		*newline = '\0';
2553 
2554 	limit = avail - col;
2555 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2556 		limit--;	/* for the border */
2557 
2558 	/* Prepend reference labels to log message if possible .*/
2559 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2560 	err = build_refs_str(&refs_str, refs, id, s->repo);
2561 	if (err)
2562 		goto done;
2563 	if (refs_str) {
2564 		char *rs;
2565 
2566 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2567 			err = got_error_from_errno("asprintf");
2568 			goto done;
2569 		}
2570 		err = format_line(&wrefstr, &refstr_width,
2571 		    &scrollx, rs, view->x, limit, col, 1);
2572 		free(rs);
2573 		if (err)
2574 			goto done;
2575 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2576 		if (tc)
2577 			wattr_on(view->window,
2578 			    COLOR_PAIR(tc->colorpair), NULL);
2579 		waddwstr(view->window, &wrefstr[scrollx]);
2580 		if (tc)
2581 			wattr_off(view->window,
2582 			    COLOR_PAIR(tc->colorpair), NULL);
2583 		col += MAX(refstr_width, 0);
2584 		if (col > avail)
2585 			goto done;
2586 
2587 		if (col < avail) {
2588 			waddch(view->window, ' ');
2589 			col++;
2590 		}
2591 
2592 		if (refstr_width > 0)
2593 			logmsg_x = 0;
2594 		else {
2595 			int unscrolled_refstr_width;
2596 			size_t len = wcslen(wrefstr);
2597 
2598 			/*
2599 			 * No need to check for -1 return value here since
2600 			 * unprintables have been replaced by span_wline().
2601 			 */
2602 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2603 			unscrolled_refstr_width += 1; /* trailing space */
2604 			logmsg_x = view->x - unscrolled_refstr_width;
2605 		}
2606 
2607 		limit = avail - col;
2608 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2609 			limit--;	/* for the border */
2610 	} else
2611 		logmsg_x = view->x;
2612 
2613 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2614 	    limit, col, 1);
2615 	if (err)
2616 		goto done;
2617 	waddwstr(view->window, &wlogmsg[scrollx]);
2618 	col += MAX(logmsg_width, 0);
2619 	while (col < avail) {
2620 		waddch(view->window, ' ');
2621 		col++;
2622 	}
2623 done:
2624 	free(logmsg0);
2625 	free(wlogmsg);
2626 	free(wrefstr);
2627 	free(refs_str);
2628 	free(author);
2629 	free(wauthor);
2630 	free(line);
2631 	return err;
2632 }
2633 
2634 static struct commit_queue_entry *
2635 alloc_commit_queue_entry(struct got_commit_object *commit,
2636     struct got_object_id *id)
2637 {
2638 	struct commit_queue_entry *entry;
2639 	struct got_object_id *dup;
2640 
2641 	entry = calloc(1, sizeof(*entry));
2642 	if (entry == NULL)
2643 		return NULL;
2644 
2645 	dup = got_object_id_dup(id);
2646 	if (dup == NULL) {
2647 		free(entry);
2648 		return NULL;
2649 	}
2650 
2651 	entry->id = dup;
2652 	entry->commit = commit;
2653 	return entry;
2654 }
2655 
2656 static void
2657 pop_commit(struct commit_queue *commits)
2658 {
2659 	struct commit_queue_entry *entry;
2660 
2661 	entry = TAILQ_FIRST(&commits->head);
2662 	TAILQ_REMOVE(&commits->head, entry, entry);
2663 	got_object_commit_close(entry->commit);
2664 	commits->ncommits--;
2665 	free(entry->id);
2666 	free(entry);
2667 }
2668 
2669 static void
2670 free_commits(struct commit_queue *commits)
2671 {
2672 	while (!TAILQ_EMPTY(&commits->head))
2673 		pop_commit(commits);
2674 }
2675 
2676 static const struct got_error *
2677 match_commit(int *have_match, struct got_object_id *id,
2678     struct got_commit_object *commit, regex_t *regex)
2679 {
2680 	const struct got_error *err = NULL;
2681 	regmatch_t regmatch;
2682 	char *id_str = NULL, *logmsg = NULL;
2683 
2684 	*have_match = 0;
2685 
2686 	err = got_object_id_str(&id_str, id);
2687 	if (err)
2688 		return err;
2689 
2690 	err = got_object_commit_get_logmsg(&logmsg, commit);
2691 	if (err)
2692 		goto done;
2693 
2694 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2695 	    &regmatch, 0) == 0 ||
2696 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2697 	    &regmatch, 0) == 0 ||
2698 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2699 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2700 		*have_match = 1;
2701 done:
2702 	free(id_str);
2703 	free(logmsg);
2704 	return err;
2705 }
2706 
2707 static const struct got_error *
2708 queue_commits(struct tog_log_thread_args *a)
2709 {
2710 	const struct got_error *err = NULL;
2711 
2712 	/*
2713 	 * We keep all commits open throughout the lifetime of the log
2714 	 * view in order to avoid having to re-fetch commits from disk
2715 	 * while updating the display.
2716 	 */
2717 	do {
2718 		struct got_object_id id;
2719 		struct got_commit_object *commit;
2720 		struct commit_queue_entry *entry;
2721 		int limit_match = 0;
2722 		int errcode;
2723 
2724 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2725 		    NULL, NULL);
2726 		if (err)
2727 			break;
2728 
2729 		err = got_object_open_as_commit(&commit, a->repo, &id);
2730 		if (err)
2731 			break;
2732 		entry = alloc_commit_queue_entry(commit, &id);
2733 		if (entry == NULL) {
2734 			err = got_error_from_errno("alloc_commit_queue_entry");
2735 			break;
2736 		}
2737 
2738 		errcode = pthread_mutex_lock(&tog_mutex);
2739 		if (errcode) {
2740 			err = got_error_set_errno(errcode,
2741 			    "pthread_mutex_lock");
2742 			break;
2743 		}
2744 
2745 		entry->idx = a->real_commits->ncommits;
2746 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2747 		a->real_commits->ncommits++;
2748 
2749 		if (*a->limiting) {
2750 			err = match_commit(&limit_match, &id, commit,
2751 			    a->limit_regex);
2752 			if (err)
2753 				break;
2754 
2755 			if (limit_match) {
2756 				struct commit_queue_entry *matched;
2757 
2758 				matched = alloc_commit_queue_entry(
2759 				    entry->commit, entry->id);
2760 				if (matched == NULL) {
2761 					err = got_error_from_errno(
2762 					    "alloc_commit_queue_entry");
2763 					break;
2764 				}
2765 				matched->commit = entry->commit;
2766 				got_object_commit_retain(entry->commit);
2767 
2768 				matched->idx = a->limit_commits->ncommits;
2769 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2770 				    matched, entry);
2771 				a->limit_commits->ncommits++;
2772 			}
2773 
2774 			/*
2775 			 * This is how we signal log_thread() that we
2776 			 * have found a match, and that it should be
2777 			 * counted as a new entry for the view.
2778 			 */
2779 			a->limit_match = limit_match;
2780 		}
2781 
2782 		if (*a->searching == TOG_SEARCH_FORWARD &&
2783 		    !*a->search_next_done) {
2784 			int have_match;
2785 			err = match_commit(&have_match, &id, commit, a->regex);
2786 			if (err)
2787 				break;
2788 
2789 			if (*a->limiting) {
2790 				if (limit_match && have_match)
2791 					*a->search_next_done =
2792 					    TOG_SEARCH_HAVE_MORE;
2793 			} else if (have_match)
2794 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2795 		}
2796 
2797 		errcode = pthread_mutex_unlock(&tog_mutex);
2798 		if (errcode && err == NULL)
2799 			err = got_error_set_errno(errcode,
2800 			    "pthread_mutex_unlock");
2801 		if (err)
2802 			break;
2803 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2804 
2805 	return err;
2806 }
2807 
2808 static void
2809 select_commit(struct tog_log_view_state *s)
2810 {
2811 	struct commit_queue_entry *entry;
2812 	int ncommits = 0;
2813 
2814 	entry = s->first_displayed_entry;
2815 	while (entry) {
2816 		if (ncommits == s->selected) {
2817 			s->selected_entry = entry;
2818 			break;
2819 		}
2820 		entry = TAILQ_NEXT(entry, entry);
2821 		ncommits++;
2822 	}
2823 }
2824 
2825 static const struct got_error *
2826 draw_commits(struct tog_view *view)
2827 {
2828 	const struct got_error *err = NULL;
2829 	struct tog_log_view_state *s = &view->state.log;
2830 	struct commit_queue_entry *entry = s->selected_entry;
2831 	int limit = view->nlines;
2832 	int width;
2833 	int ncommits, author_cols = 4, refstr_cols;
2834 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2835 	char *refs_str = NULL;
2836 	wchar_t *wline;
2837 	struct tog_color *tc;
2838 	static const size_t date_display_cols = 12;
2839 	struct got_reflist_head *refs;
2840 
2841 	if (view_is_hsplit_top(view))
2842 		--limit;  /* account for border */
2843 
2844 	if (s->selected_entry &&
2845 	    !(view->searching && view->search_next_done == 0)) {
2846 		err = got_object_id_str(&id_str, s->selected_entry->id);
2847 		if (err)
2848 			return err;
2849 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2850 		    s->selected_entry->id);
2851 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2852 		    s->repo);
2853 		if (err)
2854 			goto done;
2855 	}
2856 
2857 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2858 		halfdelay(10); /* disable fast refresh */
2859 
2860 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2861 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2862 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2863 		    (view->searching && !view->search_next_done) ?
2864 		    "searching..." : "loading...") == -1) {
2865 			err = got_error_from_errno("asprintf");
2866 			goto done;
2867 		}
2868 	} else {
2869 		const char *search_str = NULL;
2870 		const char *limit_str = NULL;
2871 
2872 		if (view->searching) {
2873 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2874 				search_str = "no more matches";
2875 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2876 				search_str = "no matches found";
2877 			else if (!view->search_next_done)
2878 				search_str = "searching...";
2879 		}
2880 
2881 		if (s->limit_view && s->commits->ncommits == 0)
2882 			limit_str = "no matches found";
2883 
2884 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2885 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2886 		    search_str ? search_str : (refs_str ? refs_str : ""),
2887 		    limit_str ? limit_str : "") == -1) {
2888 			err = got_error_from_errno("asprintf");
2889 			goto done;
2890 		}
2891 	}
2892 
2893 	free(refs_str);
2894 	refs_str = NULL;
2895 
2896 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2897 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2898 		    "........................................",
2899 		    s->in_repo_path, ncommits_str) == -1) {
2900 			err = got_error_from_errno("asprintf");
2901 			header = NULL;
2902 			goto done;
2903 		}
2904 	} else if (asprintf(&header, "commit %s%s",
2905 	    id_str ? id_str : "........................................",
2906 	    ncommits_str) == -1) {
2907 		err = got_error_from_errno("asprintf");
2908 		header = NULL;
2909 		goto done;
2910 	}
2911 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2912 	if (err)
2913 		goto done;
2914 
2915 	werase(view->window);
2916 
2917 	if (view_needs_focus_indication(view))
2918 		wstandout(view->window);
2919 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2920 	if (tc)
2921 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2922 	waddwstr(view->window, wline);
2923 	while (width < view->ncols) {
2924 		waddch(view->window, ' ');
2925 		width++;
2926 	}
2927 	if (tc)
2928 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2929 	if (view_needs_focus_indication(view))
2930 		wstandend(view->window);
2931 	free(wline);
2932 	if (limit <= 1)
2933 		goto done;
2934 
2935 	/* Grow author column size if necessary, and set view->maxx. */
2936 	entry = s->first_displayed_entry;
2937 	ncommits = 0;
2938 	view->maxx = 0;
2939 	while (entry) {
2940 		struct got_commit_object *c = entry->commit;
2941 		char *author, *eol, *msg, *msg0;
2942 		wchar_t *wauthor, *wmsg;
2943 		int width;
2944 		if (ncommits >= limit - 1)
2945 			break;
2946 		if (s->use_committer)
2947 			author = strdup(got_object_commit_get_committer(c));
2948 		else
2949 			author = strdup(got_object_commit_get_author(c));
2950 		if (author == NULL) {
2951 			err = got_error_from_errno("strdup");
2952 			goto done;
2953 		}
2954 		err = format_author(&wauthor, &width, author, COLS,
2955 		    date_display_cols);
2956 		if (author_cols < width)
2957 			author_cols = width;
2958 		free(wauthor);
2959 		free(author);
2960 		if (err)
2961 			goto done;
2962 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2963 		    entry->id);
2964 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2965 		if (err)
2966 			goto done;
2967 		if (refs_str) {
2968 			wchar_t *ws;
2969 			err = format_line(&ws, &width, NULL, refs_str,
2970 			    0, INT_MAX, date_display_cols + author_cols, 0);
2971 			free(ws);
2972 			free(refs_str);
2973 			refs_str = NULL;
2974 			if (err)
2975 				goto done;
2976 			refstr_cols = width + 3; /* account for [ ] + space */
2977 		} else
2978 			refstr_cols = 0;
2979 		err = got_object_commit_get_logmsg(&msg0, c);
2980 		if (err)
2981 			goto done;
2982 		msg = msg0;
2983 		while (*msg == '\n')
2984 			++msg;
2985 		if ((eol = strchr(msg, '\n')))
2986 			*eol = '\0';
2987 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2988 		    date_display_cols + author_cols + refstr_cols, 0);
2989 		if (err)
2990 			goto done;
2991 		view->maxx = MAX(view->maxx, width + refstr_cols);
2992 		free(msg0);
2993 		free(wmsg);
2994 		ncommits++;
2995 		entry = TAILQ_NEXT(entry, entry);
2996 	}
2997 
2998 	entry = s->first_displayed_entry;
2999 	s->last_displayed_entry = s->first_displayed_entry;
3000 	ncommits = 0;
3001 	while (entry) {
3002 		if (ncommits >= limit - 1)
3003 			break;
3004 		if (ncommits == s->selected)
3005 			wstandout(view->window);
3006 		err = draw_commit(view, entry, date_display_cols, author_cols);
3007 		if (ncommits == s->selected)
3008 			wstandend(view->window);
3009 		if (err)
3010 			goto done;
3011 		ncommits++;
3012 		s->last_displayed_entry = entry;
3013 		entry = TAILQ_NEXT(entry, entry);
3014 	}
3015 
3016 	view_border(view);
3017 done:
3018 	free(id_str);
3019 	free(refs_str);
3020 	free(ncommits_str);
3021 	free(header);
3022 	return err;
3023 }
3024 
3025 static void
3026 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3027 {
3028 	struct commit_queue_entry *entry;
3029 	int nscrolled = 0;
3030 
3031 	entry = TAILQ_FIRST(&s->commits->head);
3032 	if (s->first_displayed_entry == entry)
3033 		return;
3034 
3035 	entry = s->first_displayed_entry;
3036 	while (entry && nscrolled < maxscroll) {
3037 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3038 		if (entry) {
3039 			s->first_displayed_entry = entry;
3040 			nscrolled++;
3041 		}
3042 	}
3043 }
3044 
3045 static const struct got_error *
3046 trigger_log_thread(struct tog_view *view, int wait)
3047 {
3048 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3049 	int errcode;
3050 
3051 	if (!using_mock_io)
3052 		halfdelay(1); /* fast refresh while loading commits */
3053 
3054 	while (!ta->log_complete && !tog_thread_error &&
3055 	    (ta->commits_needed > 0 || ta->load_all)) {
3056 		/* Wake the log thread. */
3057 		errcode = pthread_cond_signal(&ta->need_commits);
3058 		if (errcode)
3059 			return got_error_set_errno(errcode,
3060 			    "pthread_cond_signal");
3061 
3062 		/*
3063 		 * The mutex will be released while the view loop waits
3064 		 * in wgetch(), at which time the log thread will run.
3065 		 */
3066 		if (!wait)
3067 			break;
3068 
3069 		/* Display progress update in log view. */
3070 		show_log_view(view);
3071 		update_panels();
3072 		doupdate();
3073 
3074 		/* Wait right here while next commit is being loaded. */
3075 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3076 		if (errcode)
3077 			return got_error_set_errno(errcode,
3078 			    "pthread_cond_wait");
3079 
3080 		/* Display progress update in log view. */
3081 		show_log_view(view);
3082 		update_panels();
3083 		doupdate();
3084 	}
3085 
3086 	return NULL;
3087 }
3088 
3089 static const struct got_error *
3090 request_log_commits(struct tog_view *view)
3091 {
3092 	struct tog_log_view_state	*state = &view->state.log;
3093 	const struct got_error		*err = NULL;
3094 
3095 	if (state->thread_args.log_complete)
3096 		return NULL;
3097 
3098 	state->thread_args.commits_needed += view->nscrolled;
3099 	err = trigger_log_thread(view, 1);
3100 	view->nscrolled = 0;
3101 
3102 	return err;
3103 }
3104 
3105 static const struct got_error *
3106 log_scroll_down(struct tog_view *view, int maxscroll)
3107 {
3108 	struct tog_log_view_state *s = &view->state.log;
3109 	const struct got_error *err = NULL;
3110 	struct commit_queue_entry *pentry;
3111 	int nscrolled = 0, ncommits_needed;
3112 
3113 	if (s->last_displayed_entry == NULL)
3114 		return NULL;
3115 
3116 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3117 	if (s->commits->ncommits < ncommits_needed &&
3118 	    !s->thread_args.log_complete) {
3119 		/*
3120 		 * Ask the log thread for required amount of commits.
3121 		 */
3122 		s->thread_args.commits_needed +=
3123 		    ncommits_needed - s->commits->ncommits;
3124 		err = trigger_log_thread(view, 1);
3125 		if (err)
3126 			return err;
3127 	}
3128 
3129 	do {
3130 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3131 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3132 			break;
3133 
3134 		s->last_displayed_entry = pentry ?
3135 		    pentry : s->last_displayed_entry;
3136 
3137 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3138 		if (pentry == NULL)
3139 			break;
3140 		s->first_displayed_entry = pentry;
3141 	} while (++nscrolled < maxscroll);
3142 
3143 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3144 		view->nscrolled += nscrolled;
3145 	else
3146 		view->nscrolled = 0;
3147 
3148 	return err;
3149 }
3150 
3151 static const struct got_error *
3152 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3153     struct got_commit_object *commit, struct got_object_id *commit_id,
3154     struct tog_view *log_view, struct got_repository *repo)
3155 {
3156 	const struct got_error *err;
3157 	struct got_object_qid *parent_id;
3158 	struct tog_view *diff_view;
3159 
3160 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3161 	if (diff_view == NULL)
3162 		return got_error_from_errno("view_open");
3163 
3164 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3165 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3166 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3167 	if (err == NULL)
3168 		*new_view = diff_view;
3169 	return err;
3170 }
3171 
3172 static const struct got_error *
3173 tree_view_visit_subtree(struct tog_tree_view_state *s,
3174     struct got_tree_object *subtree)
3175 {
3176 	struct tog_parent_tree *parent;
3177 
3178 	parent = calloc(1, sizeof(*parent));
3179 	if (parent == NULL)
3180 		return got_error_from_errno("calloc");
3181 
3182 	parent->tree = s->tree;
3183 	parent->first_displayed_entry = s->first_displayed_entry;
3184 	parent->selected_entry = s->selected_entry;
3185 	parent->selected = s->selected;
3186 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3187 	s->tree = subtree;
3188 	s->selected = 0;
3189 	s->first_displayed_entry = NULL;
3190 	return NULL;
3191 }
3192 
3193 static const struct got_error *
3194 tree_view_walk_path(struct tog_tree_view_state *s,
3195     struct got_commit_object *commit, const char *path)
3196 {
3197 	const struct got_error *err = NULL;
3198 	struct got_tree_object *tree = NULL;
3199 	const char *p;
3200 	char *slash, *subpath = NULL;
3201 
3202 	/* Walk the path and open corresponding tree objects. */
3203 	p = path;
3204 	while (*p) {
3205 		struct got_tree_entry *te;
3206 		struct got_object_id *tree_id;
3207 		char *te_name;
3208 
3209 		while (p[0] == '/')
3210 			p++;
3211 
3212 		/* Ensure the correct subtree entry is selected. */
3213 		slash = strchr(p, '/');
3214 		if (slash == NULL)
3215 			te_name = strdup(p);
3216 		else
3217 			te_name = strndup(p, slash - p);
3218 		if (te_name == NULL) {
3219 			err = got_error_from_errno("strndup");
3220 			break;
3221 		}
3222 		te = got_object_tree_find_entry(s->tree, te_name);
3223 		if (te == NULL) {
3224 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3225 			free(te_name);
3226 			break;
3227 		}
3228 		free(te_name);
3229 		s->first_displayed_entry = s->selected_entry = te;
3230 
3231 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3232 			break; /* jump to this file's entry */
3233 
3234 		slash = strchr(p, '/');
3235 		if (slash)
3236 			subpath = strndup(path, slash - path);
3237 		else
3238 			subpath = strdup(path);
3239 		if (subpath == NULL) {
3240 			err = got_error_from_errno("strdup");
3241 			break;
3242 		}
3243 
3244 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3245 		    subpath);
3246 		if (err)
3247 			break;
3248 
3249 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3250 		free(tree_id);
3251 		if (err)
3252 			break;
3253 
3254 		err = tree_view_visit_subtree(s, tree);
3255 		if (err) {
3256 			got_object_tree_close(tree);
3257 			break;
3258 		}
3259 		if (slash == NULL)
3260 			break;
3261 		free(subpath);
3262 		subpath = NULL;
3263 		p = slash;
3264 	}
3265 
3266 	free(subpath);
3267 	return err;
3268 }
3269 
3270 static const struct got_error *
3271 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3272     struct commit_queue_entry *entry, const char *path,
3273     const char *head_ref_name, struct got_repository *repo)
3274 {
3275 	const struct got_error *err = NULL;
3276 	struct tog_tree_view_state *s;
3277 	struct tog_view *tree_view;
3278 
3279 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3280 	if (tree_view == NULL)
3281 		return got_error_from_errno("view_open");
3282 
3283 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3284 	if (err)
3285 		return err;
3286 	s = &tree_view->state.tree;
3287 
3288 	*new_view = tree_view;
3289 
3290 	if (got_path_is_root_dir(path))
3291 		return NULL;
3292 
3293 	return tree_view_walk_path(s, entry->commit, path);
3294 }
3295 
3296 static const struct got_error *
3297 block_signals_used_by_main_thread(void)
3298 {
3299 	sigset_t sigset;
3300 	int errcode;
3301 
3302 	if (sigemptyset(&sigset) == -1)
3303 		return got_error_from_errno("sigemptyset");
3304 
3305 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3306 	if (sigaddset(&sigset, SIGWINCH) == -1)
3307 		return got_error_from_errno("sigaddset");
3308 	if (sigaddset(&sigset, SIGCONT) == -1)
3309 		return got_error_from_errno("sigaddset");
3310 	if (sigaddset(&sigset, SIGINT) == -1)
3311 		return got_error_from_errno("sigaddset");
3312 	if (sigaddset(&sigset, SIGTERM) == -1)
3313 		return got_error_from_errno("sigaddset");
3314 
3315 	/* ncurses handles SIGTSTP */
3316 	if (sigaddset(&sigset, SIGTSTP) == -1)
3317 		return got_error_from_errno("sigaddset");
3318 
3319 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3320 	if (errcode)
3321 		return got_error_set_errno(errcode, "pthread_sigmask");
3322 
3323 	return NULL;
3324 }
3325 
3326 static void *
3327 log_thread(void *arg)
3328 {
3329 	const struct got_error *err = NULL;
3330 	int errcode = 0;
3331 	struct tog_log_thread_args *a = arg;
3332 	int done = 0;
3333 
3334 	/*
3335 	 * Sync startup with main thread such that we begin our
3336 	 * work once view_input() has released the mutex.
3337 	 */
3338 	errcode = pthread_mutex_lock(&tog_mutex);
3339 	if (errcode) {
3340 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3341 		return (void *)err;
3342 	}
3343 
3344 	err = block_signals_used_by_main_thread();
3345 	if (err) {
3346 		pthread_mutex_unlock(&tog_mutex);
3347 		goto done;
3348 	}
3349 
3350 	while (!done && !err && !tog_fatal_signal_received()) {
3351 		errcode = pthread_mutex_unlock(&tog_mutex);
3352 		if (errcode) {
3353 			err = got_error_set_errno(errcode,
3354 			    "pthread_mutex_unlock");
3355 			goto done;
3356 		}
3357 		err = queue_commits(a);
3358 		if (err) {
3359 			if (err->code != GOT_ERR_ITER_COMPLETED)
3360 				goto done;
3361 			err = NULL;
3362 			done = 1;
3363 			a->commits_needed = 0;
3364 		} else if (a->commits_needed > 0 && !a->load_all) {
3365 			if (*a->limiting) {
3366 				if (a->limit_match)
3367 					a->commits_needed--;
3368 			} else
3369 				a->commits_needed--;
3370 		}
3371 
3372 		errcode = pthread_mutex_lock(&tog_mutex);
3373 		if (errcode) {
3374 			err = got_error_set_errno(errcode,
3375 			    "pthread_mutex_lock");
3376 			goto done;
3377 		} else if (*a->quit)
3378 			done = 1;
3379 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3380 			*a->first_displayed_entry =
3381 			    TAILQ_FIRST(&a->limit_commits->head);
3382 			*a->selected_entry = *a->first_displayed_entry;
3383 		} else if (*a->first_displayed_entry == NULL) {
3384 			*a->first_displayed_entry =
3385 			    TAILQ_FIRST(&a->real_commits->head);
3386 			*a->selected_entry = *a->first_displayed_entry;
3387 		}
3388 
3389 		errcode = pthread_cond_signal(&a->commit_loaded);
3390 		if (errcode) {
3391 			err = got_error_set_errno(errcode,
3392 			    "pthread_cond_signal");
3393 			pthread_mutex_unlock(&tog_mutex);
3394 			goto done;
3395 		}
3396 
3397 		if (a->commits_needed == 0 &&
3398 		    a->need_commit_marker && a->worktree) {
3399 			errcode = pthread_mutex_unlock(&tog_mutex);
3400 			if (errcode) {
3401 				err = got_error_set_errno(errcode,
3402 				    "pthread_mutex_unlock");
3403 				goto done;
3404 			}
3405 			err = got_worktree_get_state(&tog_base_commit.marker,
3406 			    a->repo, a->worktree, NULL, NULL);
3407 			if (err)
3408 				goto done;
3409 			errcode = pthread_mutex_lock(&tog_mutex);
3410 			if (errcode) {
3411 				err = got_error_set_errno(errcode,
3412 				    "pthread_mutex_lock");
3413 				goto done;
3414 			}
3415 			a->need_commit_marker = 0;
3416 			/*
3417 			 * The main thread did not close this
3418 			 * work tree yet. Close it now.
3419 			 */
3420 			got_worktree_close(a->worktree);
3421 			a->worktree = NULL;
3422 
3423 			if (*a->quit)
3424 				done = 1;
3425 		}
3426 
3427 		if (done)
3428 			a->commits_needed = 0;
3429 		else {
3430 			if (a->commits_needed == 0 && !a->load_all) {
3431 				if (tog_io.wait_for_ui) {
3432 					errcode = pthread_cond_signal(
3433 					    &a->log_loaded);
3434 					if (errcode && err == NULL)
3435 						err = got_error_set_errno(
3436 						    errcode,
3437 						    "pthread_cond_signal");
3438 				}
3439 
3440 				errcode = pthread_cond_wait(&a->need_commits,
3441 				    &tog_mutex);
3442 				if (errcode) {
3443 					err = got_error_set_errno(errcode,
3444 					    "pthread_cond_wait");
3445 					pthread_mutex_unlock(&tog_mutex);
3446 					goto done;
3447 				}
3448 				if (*a->quit)
3449 					done = 1;
3450 			}
3451 		}
3452 	}
3453 	a->log_complete = 1;
3454 	if (tog_io.wait_for_ui) {
3455 		errcode = pthread_cond_signal(&a->log_loaded);
3456 		if (errcode && err == NULL)
3457 			err = got_error_set_errno(errcode,
3458 			    "pthread_cond_signal");
3459 	}
3460 
3461 	errcode = pthread_mutex_unlock(&tog_mutex);
3462 	if (errcode)
3463 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3464 done:
3465 	if (err) {
3466 		tog_thread_error = 1;
3467 		pthread_cond_signal(&a->commit_loaded);
3468 		if (a->worktree) {
3469 			got_worktree_close(a->worktree);
3470 			a->worktree = NULL;
3471 		}
3472 	}
3473 	return (void *)err;
3474 }
3475 
3476 static const struct got_error *
3477 stop_log_thread(struct tog_log_view_state *s)
3478 {
3479 	const struct got_error *err = NULL, *thread_err = NULL;
3480 	int errcode;
3481 
3482 	if (s->thread) {
3483 		s->quit = 1;
3484 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3485 		if (errcode)
3486 			return got_error_set_errno(errcode,
3487 			    "pthread_cond_signal");
3488 		errcode = pthread_mutex_unlock(&tog_mutex);
3489 		if (errcode)
3490 			return got_error_set_errno(errcode,
3491 			    "pthread_mutex_unlock");
3492 		errcode = pthread_join(s->thread, (void **)&thread_err);
3493 		if (errcode)
3494 			return got_error_set_errno(errcode, "pthread_join");
3495 		errcode = pthread_mutex_lock(&tog_mutex);
3496 		if (errcode)
3497 			return got_error_set_errno(errcode,
3498 			    "pthread_mutex_lock");
3499 		s->thread = 0; //NULL;
3500 	}
3501 
3502 	if (s->thread_args.repo) {
3503 		err = got_repo_close(s->thread_args.repo);
3504 		s->thread_args.repo = NULL;
3505 	}
3506 
3507 	if (s->thread_args.pack_fds) {
3508 		const struct got_error *pack_err =
3509 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3510 		if (err == NULL)
3511 			err = pack_err;
3512 		s->thread_args.pack_fds = NULL;
3513 	}
3514 
3515 	if (s->thread_args.graph) {
3516 		got_commit_graph_close(s->thread_args.graph);
3517 		s->thread_args.graph = NULL;
3518 	}
3519 
3520 	return err ? err : thread_err;
3521 }
3522 
3523 static const struct got_error *
3524 close_log_view(struct tog_view *view)
3525 {
3526 	const struct got_error *err = NULL;
3527 	struct tog_log_view_state *s = &view->state.log;
3528 	int errcode;
3529 
3530 	err = stop_log_thread(s);
3531 
3532 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3533 	if (errcode && err == NULL)
3534 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3535 
3536 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3537 	if (errcode && err == NULL)
3538 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3539 
3540 	free_commits(&s->limit_commits);
3541 	free_commits(&s->real_commits);
3542 	free_colors(&s->colors);
3543 	free(s->in_repo_path);
3544 	s->in_repo_path = NULL;
3545 	free(s->start_id);
3546 	s->start_id = NULL;
3547 	free(s->head_ref_name);
3548 	s->head_ref_name = NULL;
3549 	return err;
3550 }
3551 
3552 /*
3553  * We use two queues to implement the limit feature: first consists of
3554  * commits matching the current limit_regex; second is the real queue
3555  * of all known commits (real_commits). When the user starts limiting,
3556  * we swap queues such that all movement and displaying functionality
3557  * works with very slight change.
3558  */
3559 static const struct got_error *
3560 limit_log_view(struct tog_view *view)
3561 {
3562 	struct tog_log_view_state *s = &view->state.log;
3563 	struct commit_queue_entry *entry;
3564 	struct tog_view	*v = view;
3565 	const struct got_error *err = NULL;
3566 	char pattern[1024];
3567 	int ret;
3568 
3569 	if (view_is_hsplit_top(view))
3570 		v = view->child;
3571 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3572 		v = view->parent;
3573 
3574 	if (tog_io.input_str != NULL) {
3575 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
3576 		    sizeof(pattern))
3577 			return got_error(GOT_ERR_NO_SPACE);
3578 	} else {
3579 		wmove(v->window, v->nlines - 1, 0);
3580 		wclrtoeol(v->window);
3581 		mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3582 		nodelay(v->window, FALSE);
3583 		nocbreak();
3584 		echo();
3585 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
3586 		cbreak();
3587 		noecho();
3588 		nodelay(v->window, TRUE);
3589 		if (ret == ERR)
3590 			return NULL;
3591 	}
3592 
3593 	if (*pattern == '\0') {
3594 		/*
3595 		 * Safety measure for the situation where the user
3596 		 * resets limit without previously limiting anything.
3597 		 */
3598 		if (!s->limit_view)
3599 			return NULL;
3600 
3601 		/*
3602 		 * User could have pressed Ctrl+L, which refreshed the
3603 		 * commit queues, it means we can't save previously
3604 		 * (before limit took place) displayed entries,
3605 		 * because they would point to already free'ed memory,
3606 		 * so we are forced to always select first entry of
3607 		 * the queue.
3608 		 */
3609 		s->commits = &s->real_commits;
3610 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3611 		s->selected_entry = s->first_displayed_entry;
3612 		s->selected = 0;
3613 		s->limit_view = 0;
3614 
3615 		return NULL;
3616 	}
3617 
3618 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3619 		return NULL;
3620 
3621 	s->limit_view = 1;
3622 
3623 	/* Clear the screen while loading limit view */
3624 	s->first_displayed_entry = NULL;
3625 	s->last_displayed_entry = NULL;
3626 	s->selected_entry = NULL;
3627 	s->commits = &s->limit_commits;
3628 
3629 	/* Prepare limit queue for new search */
3630 	free_commits(&s->limit_commits);
3631 	s->limit_commits.ncommits = 0;
3632 
3633 	/* First process commits, which are in queue already */
3634 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3635 		int have_match = 0;
3636 
3637 		err = match_commit(&have_match, entry->id,
3638 		    entry->commit, &s->limit_regex);
3639 		if (err)
3640 			return err;
3641 
3642 		if (have_match) {
3643 			struct commit_queue_entry *matched;
3644 
3645 			matched = alloc_commit_queue_entry(entry->commit,
3646 			    entry->id);
3647 			if (matched == NULL) {
3648 				err = got_error_from_errno(
3649 				    "alloc_commit_queue_entry");
3650 				break;
3651 			}
3652 			matched->commit = entry->commit;
3653 			got_object_commit_retain(entry->commit);
3654 
3655 			matched->idx = s->limit_commits.ncommits;
3656 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3657 			    matched, entry);
3658 			s->limit_commits.ncommits++;
3659 		}
3660 	}
3661 
3662 	/* Second process all the commits, until we fill the screen */
3663 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3664 	    !s->thread_args.log_complete) {
3665 		s->thread_args.commits_needed +=
3666 		    view->nlines - s->limit_commits.ncommits - 1;
3667 		err = trigger_log_thread(view, 1);
3668 		if (err)
3669 			return err;
3670 	}
3671 
3672 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3673 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3674 	s->selected = 0;
3675 
3676 	return NULL;
3677 }
3678 
3679 static const struct got_error *
3680 search_start_log_view(struct tog_view *view)
3681 {
3682 	struct tog_log_view_state *s = &view->state.log;
3683 
3684 	s->matched_entry = NULL;
3685 	s->search_entry = NULL;
3686 	return NULL;
3687 }
3688 
3689 static const struct got_error *
3690 search_next_log_view(struct tog_view *view)
3691 {
3692 	const struct got_error *err = NULL;
3693 	struct tog_log_view_state *s = &view->state.log;
3694 	struct commit_queue_entry *entry;
3695 
3696 	/* Display progress update in log view. */
3697 	show_log_view(view);
3698 	update_panels();
3699 	doupdate();
3700 
3701 	if (s->search_entry) {
3702 		if (!using_mock_io) {
3703 			int errcode, ch;
3704 
3705 			errcode = pthread_mutex_unlock(&tog_mutex);
3706 			if (errcode)
3707 				return got_error_set_errno(errcode,
3708 				    "pthread_mutex_unlock");
3709 			ch = wgetch(view->window);
3710 			errcode = pthread_mutex_lock(&tog_mutex);
3711 			if (errcode)
3712 				return got_error_set_errno(errcode,
3713 				    "pthread_mutex_lock");
3714 			if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3715 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3716 				return NULL;
3717 			}
3718 		}
3719 		if (view->searching == TOG_SEARCH_FORWARD)
3720 			entry = TAILQ_NEXT(s->search_entry, entry);
3721 		else
3722 			entry = TAILQ_PREV(s->search_entry,
3723 			    commit_queue_head, entry);
3724 	} else if (s->matched_entry) {
3725 		/*
3726 		 * If the user has moved the cursor after we hit a match,
3727 		 * the position from where we should continue searching
3728 		 * might have changed.
3729 		 */
3730 		if (view->searching == TOG_SEARCH_FORWARD)
3731 			entry = TAILQ_NEXT(s->selected_entry, entry);
3732 		else
3733 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3734 			    entry);
3735 	} else {
3736 		entry = s->selected_entry;
3737 	}
3738 
3739 	while (1) {
3740 		int have_match = 0;
3741 
3742 		if (entry == NULL) {
3743 			if (s->thread_args.log_complete ||
3744 			    view->searching == TOG_SEARCH_BACKWARD) {
3745 				view->search_next_done =
3746 				    (s->matched_entry == NULL ?
3747 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3748 				s->search_entry = NULL;
3749 				return NULL;
3750 			}
3751 			/*
3752 			 * Poke the log thread for more commits and return,
3753 			 * allowing the main loop to make progress. Search
3754 			 * will resume at s->search_entry once we come back.
3755 			 */
3756 			s->search_entry = s->selected_entry;
3757 			s->thread_args.commits_needed++;
3758 			return trigger_log_thread(view, 0);
3759 		}
3760 
3761 		err = match_commit(&have_match, entry->id, entry->commit,
3762 		    &view->regex);
3763 		if (err)
3764 			break;
3765 		if (have_match) {
3766 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3767 			s->matched_entry = entry;
3768 			break;
3769 		}
3770 
3771 		s->search_entry = entry;
3772 		if (view->searching == TOG_SEARCH_FORWARD)
3773 			entry = TAILQ_NEXT(entry, entry);
3774 		else
3775 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3776 	}
3777 
3778 	if (s->matched_entry) {
3779 		int cur = s->selected_entry->idx;
3780 		while (cur < s->matched_entry->idx) {
3781 			err = input_log_view(NULL, view, KEY_DOWN);
3782 			if (err)
3783 				return err;
3784 			cur++;
3785 		}
3786 		while (cur > s->matched_entry->idx) {
3787 			err = input_log_view(NULL, view, KEY_UP);
3788 			if (err)
3789 				return err;
3790 			cur--;
3791 		}
3792 	}
3793 
3794 	s->search_entry = NULL;
3795 
3796 	return NULL;
3797 }
3798 
3799 static const struct got_error *
3800 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3801     struct got_repository *repo, const char *head_ref_name,
3802     const char *in_repo_path, int log_branches,
3803     struct got_worktree *worktree)
3804 {
3805 	const struct got_error *err = NULL;
3806 	struct tog_log_view_state *s = &view->state.log;
3807 	struct got_repository *thread_repo = NULL;
3808 	struct got_commit_graph *thread_graph = NULL;
3809 	int errcode;
3810 
3811 	if (in_repo_path != s->in_repo_path) {
3812 		free(s->in_repo_path);
3813 		s->in_repo_path = strdup(in_repo_path);
3814 		if (s->in_repo_path == NULL) {
3815 			err = got_error_from_errno("strdup");
3816 			goto done;
3817 		}
3818 	}
3819 
3820 	/* The commit queue only contains commits being displayed. */
3821 	TAILQ_INIT(&s->real_commits.head);
3822 	s->real_commits.ncommits = 0;
3823 	s->commits = &s->real_commits;
3824 
3825 	TAILQ_INIT(&s->limit_commits.head);
3826 	s->limit_view = 0;
3827 	s->limit_commits.ncommits = 0;
3828 
3829 	s->repo = repo;
3830 	if (head_ref_name) {
3831 		s->head_ref_name = strdup(head_ref_name);
3832 		if (s->head_ref_name == NULL) {
3833 			err = got_error_from_errno("strdup");
3834 			goto done;
3835 		}
3836 	}
3837 	s->start_id = got_object_id_dup(start_id);
3838 	if (s->start_id == NULL) {
3839 		err = got_error_from_errno("got_object_id_dup");
3840 		goto done;
3841 	}
3842 	s->log_branches = log_branches;
3843 	s->use_committer = 1;
3844 
3845 	STAILQ_INIT(&s->colors);
3846 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3847 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3848 		    get_color_value("TOG_COLOR_COMMIT"));
3849 		if (err)
3850 			goto done;
3851 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3852 		    get_color_value("TOG_COLOR_AUTHOR"));
3853 		if (err)
3854 			goto done;
3855 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3856 		    get_color_value("TOG_COLOR_DATE"));
3857 		if (err)
3858 			goto done;
3859 	}
3860 
3861 	view->show = show_log_view;
3862 	view->input = input_log_view;
3863 	view->resize = resize_log_view;
3864 	view->close = close_log_view;
3865 	view->search_start = search_start_log_view;
3866 	view->search_next = search_next_log_view;
3867 
3868 	if (s->thread_args.pack_fds == NULL) {
3869 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3870 		if (err)
3871 			goto done;
3872 	}
3873 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3874 	    s->thread_args.pack_fds);
3875 	if (err)
3876 		goto done;
3877 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3878 	    !s->log_branches);
3879 	if (err)
3880 		goto done;
3881 	err = got_commit_graph_bfsort(thread_graph, s->start_id,
3882 	    s->repo, NULL, NULL);
3883 	if (err)
3884 		goto done;
3885 
3886 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3887 	if (errcode) {
3888 		err = got_error_set_errno(errcode, "pthread_cond_init");
3889 		goto done;
3890 	}
3891 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3892 	if (errcode) {
3893 		err = got_error_set_errno(errcode, "pthread_cond_init");
3894 		goto done;
3895 	}
3896 
3897 	if (using_mock_io) {
3898 		int rc;
3899 
3900 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3901 		if (rc)
3902 			return got_error_set_errno(rc, "pthread_cond_init");
3903 	}
3904 
3905 	s->thread_args.commits_needed = view->nlines;
3906 	s->thread_args.graph = thread_graph;
3907 	s->thread_args.real_commits = &s->real_commits;
3908 	s->thread_args.limit_commits = &s->limit_commits;
3909 	s->thread_args.in_repo_path = s->in_repo_path;
3910 	s->thread_args.start_id = s->start_id;
3911 	s->thread_args.repo = thread_repo;
3912 	s->thread_args.log_complete = 0;
3913 	s->thread_args.quit = &s->quit;
3914 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3915 	s->thread_args.selected_entry = &s->selected_entry;
3916 	s->thread_args.searching = &view->searching;
3917 	s->thread_args.search_next_done = &view->search_next_done;
3918 	s->thread_args.regex = &view->regex;
3919 	s->thread_args.limiting = &s->limit_view;
3920 	s->thread_args.limit_regex = &s->limit_regex;
3921 	s->thread_args.limit_commits = &s->limit_commits;
3922 	s->thread_args.worktree = worktree;
3923 	if (worktree)
3924 		s->thread_args.need_commit_marker = 1;
3925 done:
3926 	if (err) {
3927 		if (view->close == NULL)
3928 			close_log_view(view);
3929 		view_close(view);
3930 	}
3931 	return err;
3932 }
3933 
3934 static const struct got_error *
3935 show_log_view(struct tog_view *view)
3936 {
3937 	const struct got_error *err;
3938 	struct tog_log_view_state *s = &view->state.log;
3939 
3940 	if (s->thread == 0) { //NULL) {
3941 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3942 		    &s->thread_args);
3943 		if (errcode)
3944 			return got_error_set_errno(errcode, "pthread_create");
3945 		if (s->thread_args.commits_needed > 0) {
3946 			err = trigger_log_thread(view, 1);
3947 			if (err)
3948 				return err;
3949 		}
3950 	}
3951 
3952 	return draw_commits(view);
3953 }
3954 
3955 static void
3956 log_move_cursor_up(struct tog_view *view, int page, int home)
3957 {
3958 	struct tog_log_view_state *s = &view->state.log;
3959 
3960 	if (s->first_displayed_entry == NULL)
3961 		return;
3962 	if (s->selected_entry->idx == 0)
3963 		view->count = 0;
3964 
3965 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3966 	    || home)
3967 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3968 
3969 	if (!page && !home && s->selected > 0)
3970 		--s->selected;
3971 	else
3972 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3973 
3974 	select_commit(s);
3975 	return;
3976 }
3977 
3978 static const struct got_error *
3979 log_move_cursor_down(struct tog_view *view, int page)
3980 {
3981 	struct tog_log_view_state	*s = &view->state.log;
3982 	const struct got_error		*err = NULL;
3983 	int				 eos = view->nlines - 2;
3984 
3985 	if (s->first_displayed_entry == NULL)
3986 		return NULL;
3987 
3988 	if (s->thread_args.log_complete &&
3989 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3990 		return NULL;
3991 
3992 	if (view_is_hsplit_top(view))
3993 		--eos;  /* border consumes the last line */
3994 
3995 	if (!page) {
3996 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3997 			++s->selected;
3998 		else
3999 			err = log_scroll_down(view, 1);
4000 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
4001 		struct commit_queue_entry *entry;
4002 		int n;
4003 
4004 		s->selected = 0;
4005 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
4006 		s->last_displayed_entry = entry;
4007 		for (n = 0; n <= eos; n++) {
4008 			if (entry == NULL)
4009 				break;
4010 			s->first_displayed_entry = entry;
4011 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
4012 		}
4013 		if (n > 0)
4014 			s->selected = n - 1;
4015 	} else {
4016 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
4017 		    s->thread_args.log_complete)
4018 			s->selected += MIN(page,
4019 			    s->commits->ncommits - s->selected_entry->idx - 1);
4020 		else
4021 			err = log_scroll_down(view, page);
4022 	}
4023 	if (err)
4024 		return err;
4025 
4026 	/*
4027 	 * We might necessarily overshoot in horizontal
4028 	 * splits; if so, select the last displayed commit.
4029 	 */
4030 	if (s->first_displayed_entry && s->last_displayed_entry) {
4031 		s->selected = MIN(s->selected,
4032 		    s->last_displayed_entry->idx -
4033 		    s->first_displayed_entry->idx);
4034 	}
4035 
4036 	select_commit(s);
4037 
4038 	if (s->thread_args.log_complete &&
4039 	    s->selected_entry->idx == s->commits->ncommits - 1)
4040 		view->count = 0;
4041 
4042 	return NULL;
4043 }
4044 
4045 static void
4046 view_get_split(struct tog_view *view, int *y, int *x)
4047 {
4048 	*x = 0;
4049 	*y = 0;
4050 
4051 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4052 		if (view->child && view->child->resized_y)
4053 			*y = view->child->resized_y;
4054 		else if (view->resized_y)
4055 			*y = view->resized_y;
4056 		else
4057 			*y = view_split_begin_y(view->lines);
4058 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4059 		if (view->child && view->child->resized_x)
4060 			*x = view->child->resized_x;
4061 		else if (view->resized_x)
4062 			*x = view->resized_x;
4063 		else
4064 			*x = view_split_begin_x(view->begin_x);
4065 	}
4066 }
4067 
4068 /* Split view horizontally at y and offset view->state->selected line. */
4069 static const struct got_error *
4070 view_init_hsplit(struct tog_view *view, int y)
4071 {
4072 	const struct got_error *err = NULL;
4073 
4074 	view->nlines = y;
4075 	view->ncols = COLS;
4076 	err = view_resize(view);
4077 	if (err)
4078 		return err;
4079 
4080 	err = offset_selection_down(view);
4081 
4082 	return err;
4083 }
4084 
4085 static const struct got_error *
4086 log_goto_line(struct tog_view *view, int nlines)
4087 {
4088 	const struct got_error		*err = NULL;
4089 	struct tog_log_view_state	*s = &view->state.log;
4090 	int				 g, idx = s->selected_entry->idx;
4091 
4092 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4093 		return NULL;
4094 
4095 	g = view->gline;
4096 	view->gline = 0;
4097 
4098 	if (g >= s->first_displayed_entry->idx + 1 &&
4099 	    g <= s->last_displayed_entry->idx + 1 &&
4100 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4101 		s->selected = g - s->first_displayed_entry->idx - 1;
4102 		select_commit(s);
4103 		return NULL;
4104 	}
4105 
4106 	if (idx + 1 < g) {
4107 		err = log_move_cursor_down(view, g - idx - 1);
4108 		if (!err && g > s->selected_entry->idx + 1)
4109 			err = log_move_cursor_down(view,
4110 			    g - s->first_displayed_entry->idx - 1);
4111 		if (err)
4112 			return err;
4113 	} else if (idx + 1 > g)
4114 		log_move_cursor_up(view, idx - g + 1, 0);
4115 
4116 	if (g < nlines && s->first_displayed_entry->idx == 0)
4117 		s->selected = g - 1;
4118 
4119 	select_commit(s);
4120 	return NULL;
4121 
4122 }
4123 
4124 static void
4125 horizontal_scroll_input(struct tog_view *view, int ch)
4126 {
4127 
4128 	switch (ch) {
4129 	case KEY_LEFT:
4130 	case 'h':
4131 		view->x -= MIN(view->x, 2);
4132 		if (view->x <= 0)
4133 			view->count = 0;
4134 		break;
4135 	case KEY_RIGHT:
4136 	case 'l':
4137 		if (view->x + view->ncols / 2 < view->maxx)
4138 			view->x += 2;
4139 		else
4140 			view->count = 0;
4141 		break;
4142 	case '0':
4143 		view->x = 0;
4144 		break;
4145 	case '$':
4146 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4147 		view->count = 0;
4148 		break;
4149 	default:
4150 		break;
4151 	}
4152 }
4153 
4154 static const struct got_error *
4155 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4156 {
4157 	const struct got_error *err = NULL;
4158 	struct tog_log_view_state *s = &view->state.log;
4159 	int eos, nscroll;
4160 
4161 	if (s->thread_args.load_all) {
4162 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4163 			s->thread_args.load_all = 0;
4164 		else if (s->thread_args.log_complete) {
4165 			err = log_move_cursor_down(view, s->commits->ncommits);
4166 			s->thread_args.load_all = 0;
4167 		}
4168 		if (err)
4169 			return err;
4170 	}
4171 
4172 	eos = nscroll = view->nlines - 1;
4173 	if (view_is_hsplit_top(view))
4174 		--eos;  /* border */
4175 
4176 	if (view->gline)
4177 		return log_goto_line(view, eos);
4178 
4179 	switch (ch) {
4180 	case '&':
4181 		err = limit_log_view(view);
4182 		break;
4183 	case 'q':
4184 		s->quit = 1;
4185 		break;
4186 	case '0':
4187 	case '$':
4188 	case KEY_RIGHT:
4189 	case 'l':
4190 	case KEY_LEFT:
4191 	case 'h':
4192 		horizontal_scroll_input(view, ch);
4193 		break;
4194 	case 'k':
4195 	case KEY_UP:
4196 	case '<':
4197 	case ',':
4198 	case CTRL('p'):
4199 		log_move_cursor_up(view, 0, 0);
4200 		break;
4201 	case 'g':
4202 	case '=':
4203 	case KEY_HOME:
4204 		log_move_cursor_up(view, 0, 1);
4205 		view->count = 0;
4206 		break;
4207 	case CTRL('u'):
4208 	case 'u':
4209 		nscroll /= 2;
4210 		/* FALL THROUGH */
4211 	case KEY_PPAGE:
4212 	case CTRL('b'):
4213 	case 'b':
4214 		log_move_cursor_up(view, nscroll, 0);
4215 		break;
4216 	case 'j':
4217 	case KEY_DOWN:
4218 	case '>':
4219 	case '.':
4220 	case CTRL('n'):
4221 		err = log_move_cursor_down(view, 0);
4222 		break;
4223 	case '@':
4224 		s->use_committer = !s->use_committer;
4225 		view->action = s->use_committer ?
4226 		    "show committer" : "show commit author";
4227 		break;
4228 	case 'G':
4229 	case '*':
4230 	case KEY_END: {
4231 		/* We don't know yet how many commits, so we're forced to
4232 		 * traverse them all. */
4233 		view->count = 0;
4234 		s->thread_args.load_all = 1;
4235 		if (!s->thread_args.log_complete)
4236 			return trigger_log_thread(view, 0);
4237 		err = log_move_cursor_down(view, s->commits->ncommits);
4238 		s->thread_args.load_all = 0;
4239 		break;
4240 	}
4241 	case CTRL('d'):
4242 	case 'd':
4243 		nscroll /= 2;
4244 		/* FALL THROUGH */
4245 	case KEY_NPAGE:
4246 	case CTRL('f'):
4247 	case 'f':
4248 	case ' ':
4249 		err = log_move_cursor_down(view, nscroll);
4250 		break;
4251 	case KEY_RESIZE:
4252 		if (s->selected > view->nlines - 2)
4253 			s->selected = view->nlines - 2;
4254 		if (s->selected > s->commits->ncommits - 1)
4255 			s->selected = s->commits->ncommits - 1;
4256 		select_commit(s);
4257 		if (s->commits->ncommits < view->nlines - 1 &&
4258 		    !s->thread_args.log_complete) {
4259 			s->thread_args.commits_needed += (view->nlines - 1) -
4260 			    s->commits->ncommits;
4261 			err = trigger_log_thread(view, 1);
4262 		}
4263 		break;
4264 	case KEY_ENTER:
4265 	case '\r':
4266 		view->count = 0;
4267 		if (s->selected_entry == NULL)
4268 			break;
4269 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4270 		break;
4271 	case 'T':
4272 		view->count = 0;
4273 		if (s->selected_entry == NULL)
4274 			break;
4275 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4276 		break;
4277 	case KEY_BACKSPACE:
4278 	case CTRL('l'):
4279 	case 'B':
4280 		view->count = 0;
4281 		if (ch == KEY_BACKSPACE &&
4282 		    got_path_is_root_dir(s->in_repo_path))
4283 			break;
4284 		err = stop_log_thread(s);
4285 		if (err)
4286 			return err;
4287 		if (ch == KEY_BACKSPACE) {
4288 			char *parent_path;
4289 			err = got_path_dirname(&parent_path, s->in_repo_path);
4290 			if (err)
4291 				return err;
4292 			free(s->in_repo_path);
4293 			s->in_repo_path = parent_path;
4294 			s->thread_args.in_repo_path = s->in_repo_path;
4295 		} else if (ch == CTRL('l')) {
4296 			struct got_object_id *start_id;
4297 			err = got_repo_match_object_id(&start_id, NULL,
4298 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4299 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4300 			if (err) {
4301 				if (s->head_ref_name == NULL ||
4302 				    err->code != GOT_ERR_NOT_REF)
4303 					return err;
4304 				/* Try to cope with deleted references. */
4305 				free(s->head_ref_name);
4306 				s->head_ref_name = NULL;
4307 				err = got_repo_match_object_id(&start_id,
4308 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4309 				    &tog_refs, s->repo);
4310 				if (err)
4311 					return err;
4312 			}
4313 			free(s->start_id);
4314 			s->start_id = start_id;
4315 			s->thread_args.start_id = s->start_id;
4316 		} else /* 'B' */
4317 			s->log_branches = !s->log_branches;
4318 
4319 		if (s->thread_args.pack_fds == NULL) {
4320 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4321 			if (err)
4322 				return err;
4323 		}
4324 		err = got_repo_open(&s->thread_args.repo,
4325 		    got_repo_get_path(s->repo), NULL,
4326 		    s->thread_args.pack_fds);
4327 		if (err)
4328 			return err;
4329 		tog_free_refs();
4330 		err = tog_load_refs(s->repo, 0);
4331 		if (err)
4332 			return err;
4333 		err = got_commit_graph_open(&s->thread_args.graph,
4334 		    s->in_repo_path, !s->log_branches);
4335 		if (err)
4336 			return err;
4337 		err = got_commit_graph_bfsort(s->thread_args.graph,
4338 		    s->start_id, s->repo, NULL, NULL);
4339 		if (err)
4340 			return err;
4341 		free_commits(&s->real_commits);
4342 		free_commits(&s->limit_commits);
4343 		s->first_displayed_entry = NULL;
4344 		s->last_displayed_entry = NULL;
4345 		s->selected_entry = NULL;
4346 		s->selected = 0;
4347 		s->thread_args.log_complete = 0;
4348 		s->quit = 0;
4349 		s->thread_args.commits_needed = view->lines;
4350 		s->matched_entry = NULL;
4351 		s->search_entry = NULL;
4352 		view->offset = 0;
4353 		break;
4354 	case 'R':
4355 		view->count = 0;
4356 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4357 		break;
4358 	default:
4359 		view->count = 0;
4360 		break;
4361 	}
4362 
4363 	return err;
4364 }
4365 
4366 static const struct got_error *
4367 apply_unveil(const char *repo_path, const char *worktree_path)
4368 {
4369 	const struct got_error *error;
4370 
4371 #ifdef PROFILE
4372 	if (unveil("gmon.out", "rwc") != 0)
4373 		return got_error_from_errno2("unveil", "gmon.out");
4374 #endif
4375 	if (repo_path && unveil(repo_path, "r") != 0)
4376 		return got_error_from_errno2("unveil", repo_path);
4377 
4378 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4379 		return got_error_from_errno2("unveil", worktree_path);
4380 
4381 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4382 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4383 
4384 	error = got_privsep_unveil_exec_helpers();
4385 	if (error != NULL)
4386 		return error;
4387 
4388 	if (unveil(NULL, NULL) != 0)
4389 		return got_error_from_errno("unveil");
4390 
4391 	return NULL;
4392 }
4393 
4394 static const struct got_error *
4395 init_mock_term(const char *test_script_path)
4396 {
4397 	const struct got_error	*err = NULL;
4398 	const char *screen_dump_path;
4399 	int in;
4400 
4401 	if (test_script_path == NULL || *test_script_path == '\0')
4402 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4403 
4404 	tog_io.f = fopen(test_script_path, "re");
4405 	if (tog_io.f == NULL) {
4406 		err = got_error_from_errno_fmt("fopen: %s",
4407 		    test_script_path);
4408 		goto done;
4409 	}
4410 
4411 	/* test mode, we don't want any output */
4412 	tog_io.cout = fopen("/dev/null", "w+");
4413 	if (tog_io.cout == NULL) {
4414 		err = got_error_from_errno2("fopen", "/dev/null");
4415 		goto done;
4416 	}
4417 
4418 	in = dup(fileno(tog_io.cout));
4419 	if (in == -1) {
4420 		err = got_error_from_errno("dup");
4421 		goto done;
4422 	}
4423 	tog_io.cin = fdopen(in, "r");
4424 	if (tog_io.cin == NULL) {
4425 		err = got_error_from_errno("fdopen");
4426 		close(in);
4427 		goto done;
4428 	}
4429 
4430 	screen_dump_path = getenv("TOG_SCR_DUMP");
4431 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4432 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4433 	tog_io.sdump = fopen(screen_dump_path, "we");
4434 	if (tog_io.sdump == NULL) {
4435 		err = got_error_from_errno2("fopen", screen_dump_path);
4436 		goto done;
4437 	}
4438 
4439 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4440 		err = got_error_from_errno("fseeko");
4441 		goto done;
4442 	}
4443 
4444 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4445 		err = got_error_msg(GOT_ERR_IO,
4446 		    "newterm: failed to initialise curses");
4447 
4448 	using_mock_io = 1;
4449 
4450 done:
4451 	if (err)
4452 		tog_io_close();
4453 	return err;
4454 }
4455 
4456 static void
4457 init_curses(void)
4458 {
4459 	if (using_mock_io) /* In test mode we use a fake terminal */
4460 		return;
4461 
4462 	initscr();
4463 
4464 	cbreak();
4465 	halfdelay(1); /* Fast refresh while initial view is loading. */
4466 	noecho();
4467 	nonl();
4468 	intrflush(stdscr, FALSE);
4469 	keypad(stdscr, TRUE);
4470 	curs_set(0);
4471 	if (getenv("TOG_COLORS") != NULL) {
4472 		start_color();
4473 		use_default_colors();
4474 	}
4475 
4476 	return;
4477 }
4478 
4479 static const struct got_error *
4480 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4481 {
4482 	tog_base_commit.id = got_object_id_dup(
4483 	    got_worktree_get_base_commit_id(worktree));
4484 	if (tog_base_commit.id == NULL)
4485 		return got_error_from_errno( "got_object_id_dup");
4486 
4487 	return NULL;
4488 }
4489 
4490 static const struct got_error *
4491 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4492     struct got_repository *repo, struct got_worktree *worktree)
4493 {
4494 	const struct got_error *err = NULL;
4495 
4496 	if (argc == 0) {
4497 		*in_repo_path = strdup("/");
4498 		if (*in_repo_path == NULL)
4499 			return got_error_from_errno("strdup");
4500 		return NULL;
4501 	}
4502 
4503 	if (worktree) {
4504 		const char *prefix = got_worktree_get_path_prefix(worktree);
4505 		char *p;
4506 
4507 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4508 		if (err)
4509 			return err;
4510 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4511 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4512 		    p) == -1) {
4513 			err = got_error_from_errno("asprintf");
4514 			*in_repo_path = NULL;
4515 		}
4516 		free(p);
4517 	} else
4518 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4519 
4520 	return err;
4521 }
4522 
4523 static const struct got_error *
4524 cmd_log(int argc, char *argv[])
4525 {
4526 	const struct got_error *error;
4527 	struct got_repository *repo = NULL;
4528 	struct got_worktree *worktree = NULL;
4529 	struct got_object_id *start_id = NULL;
4530 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4531 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4532 	struct got_reference *ref = NULL;
4533 	const char *head_ref_name = NULL;
4534 	int ch, log_branches = 0;
4535 	struct tog_view *view;
4536 	int *pack_fds = NULL;
4537 
4538 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4539 		switch (ch) {
4540 		case 'b':
4541 			log_branches = 1;
4542 			break;
4543 		case 'c':
4544 			start_commit = optarg;
4545 			break;
4546 		case 'r':
4547 			repo_path = realpath(optarg, NULL);
4548 			if (repo_path == NULL)
4549 				return got_error_from_errno2("realpath",
4550 				    optarg);
4551 			break;
4552 		default:
4553 			usage_log();
4554 			/* NOTREACHED */
4555 		}
4556 	}
4557 
4558 	argc -= optind;
4559 	argv += optind;
4560 
4561 	if (argc > 1)
4562 		usage_log();
4563 
4564 	error = got_repo_pack_fds_open(&pack_fds);
4565 	if (error != NULL)
4566 		goto done;
4567 
4568 	if (repo_path == NULL) {
4569 		cwd = getcwd(NULL, 0);
4570 		if (cwd == NULL) {
4571 			error = got_error_from_errno("getcwd");
4572 			goto done;
4573 		}
4574 		error = got_worktree_open(&worktree, cwd, NULL);
4575 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4576 			goto done;
4577 		if (worktree)
4578 			repo_path =
4579 			    strdup(got_worktree_get_repo_path(worktree));
4580 		else
4581 			repo_path = strdup(cwd);
4582 		if (repo_path == NULL) {
4583 			error = got_error_from_errno("strdup");
4584 			goto done;
4585 		}
4586 	}
4587 
4588 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4589 	if (error != NULL)
4590 		goto done;
4591 
4592 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4593 	    repo, worktree);
4594 	if (error)
4595 		goto done;
4596 
4597 	init_curses();
4598 
4599 	error = apply_unveil(got_repo_get_path(repo),
4600 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4601 	if (error)
4602 		goto done;
4603 
4604 	/* already loaded by tog_log_with_path()? */
4605 	if (TAILQ_EMPTY(&tog_refs)) {
4606 		error = tog_load_refs(repo, 0);
4607 		if (error)
4608 			goto done;
4609 	}
4610 
4611 	if (start_commit == NULL) {
4612 		error = got_repo_match_object_id(&start_id, &label,
4613 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4614 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4615 		if (error)
4616 			goto done;
4617 		head_ref_name = label;
4618 	} else {
4619 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4620 		    repo, worktree);
4621 		if (error != NULL)
4622 			goto done;
4623 		if (keyword_idstr != NULL)
4624 			start_commit = keyword_idstr;
4625 
4626 		error = got_ref_open(&ref, repo, start_commit, 0);
4627 		if (error == NULL)
4628 			head_ref_name = got_ref_get_name(ref);
4629 		else if (error->code != GOT_ERR_NOT_REF)
4630 			goto done;
4631 		error = got_repo_match_object_id(&start_id, NULL,
4632 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4633 		if (error)
4634 			goto done;
4635 	}
4636 
4637 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4638 	if (view == NULL) {
4639 		error = got_error_from_errno("view_open");
4640 		goto done;
4641 	}
4642 
4643 	if (worktree) {
4644 		error = set_tog_base_commit(repo, worktree);
4645 		if (error != NULL)
4646 			goto done;
4647 	}
4648 
4649 	error = open_log_view(view, start_id, repo, head_ref_name,
4650 	    in_repo_path, log_branches, worktree);
4651 	if (error)
4652 		goto done;
4653 
4654 	if (worktree) {
4655 		/* The work tree will be closed by the log thread. */
4656 		worktree = NULL;
4657 	}
4658 
4659 	error = view_loop(view);
4660 
4661 done:
4662 	free(tog_base_commit.id);
4663 	free(keyword_idstr);
4664 	free(in_repo_path);
4665 	free(repo_path);
4666 	free(cwd);
4667 	free(start_id);
4668 	free(label);
4669 	if (ref)
4670 		got_ref_close(ref);
4671 	if (repo) {
4672 		const struct got_error *close_err = got_repo_close(repo);
4673 		if (error == NULL)
4674 			error = close_err;
4675 	}
4676 	if (worktree)
4677 		got_worktree_close(worktree);
4678 	if (pack_fds) {
4679 		const struct got_error *pack_err =
4680 		    got_repo_pack_fds_close(pack_fds);
4681 		if (error == NULL)
4682 			error = pack_err;
4683 	}
4684 	tog_free_refs();
4685 	return error;
4686 }
4687 
4688 __dead static void
4689 usage_diff(void)
4690 {
4691 	endwin();
4692 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4693 	    "object1 object2\n", getprogname());
4694 	exit(1);
4695 }
4696 
4697 static int
4698 match_line(const char *line, regex_t *regex, size_t nmatch,
4699     regmatch_t *regmatch)
4700 {
4701 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4702 }
4703 
4704 static struct tog_color *
4705 match_color(struct tog_colors *colors, const char *line)
4706 {
4707 	struct tog_color *tc = NULL;
4708 
4709 	STAILQ_FOREACH(tc, colors, entry) {
4710 		if (match_line(line, &tc->regex, 0, NULL))
4711 			return tc;
4712 	}
4713 
4714 	return NULL;
4715 }
4716 
4717 static const struct got_error *
4718 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4719     WINDOW *window, int skipcol, regmatch_t *regmatch)
4720 {
4721 	const struct got_error *err = NULL;
4722 	char *exstr = NULL;
4723 	wchar_t *wline = NULL;
4724 	int rme, rms, n, width, scrollx;
4725 	int width0 = 0, width1 = 0, width2 = 0;
4726 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4727 
4728 	*wtotal = 0;
4729 
4730 	rms = regmatch->rm_so;
4731 	rme = regmatch->rm_eo;
4732 
4733 	err = expand_tab(&exstr, line);
4734 	if (err)
4735 		return err;
4736 
4737 	/* Split the line into 3 segments, according to match offsets. */
4738 	seg0 = strndup(exstr, rms);
4739 	if (seg0 == NULL) {
4740 		err = got_error_from_errno("strndup");
4741 		goto done;
4742 	}
4743 	seg1 = strndup(exstr + rms, rme - rms);
4744 	if (seg1 == NULL) {
4745 		err = got_error_from_errno("strndup");
4746 		goto done;
4747 	}
4748 	seg2 = strdup(exstr + rme);
4749 	if (seg2 == NULL) {
4750 		err = got_error_from_errno("strndup");
4751 		goto done;
4752 	}
4753 
4754 	/* draw up to matched token if we haven't scrolled past it */
4755 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4756 	    col_tab_align, 1);
4757 	if (err)
4758 		goto done;
4759 	n = MAX(width0 - skipcol, 0);
4760 	if (n) {
4761 		free(wline);
4762 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4763 		    wlimit, col_tab_align, 1);
4764 		if (err)
4765 			goto done;
4766 		waddwstr(window, &wline[scrollx]);
4767 		wlimit -= width;
4768 		*wtotal += width;
4769 	}
4770 
4771 	if (wlimit > 0) {
4772 		int i = 0, w = 0;
4773 		size_t wlen;
4774 
4775 		free(wline);
4776 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4777 		    col_tab_align, 1);
4778 		if (err)
4779 			goto done;
4780 		wlen = wcslen(wline);
4781 		while (i < wlen) {
4782 			width = wcwidth(wline[i]);
4783 			if (width == -1) {
4784 				/* should not happen, tabs are expanded */
4785 				err = got_error(GOT_ERR_RANGE);
4786 				goto done;
4787 			}
4788 			if (width0 + w + width > skipcol)
4789 				break;
4790 			w += width;
4791 			i++;
4792 		}
4793 		/* draw (visible part of) matched token (if scrolled into it) */
4794 		if (width1 - w > 0) {
4795 			wattron(window, A_STANDOUT);
4796 			waddwstr(window, &wline[i]);
4797 			wattroff(window, A_STANDOUT);
4798 			wlimit -= (width1 - w);
4799 			*wtotal += (width1 - w);
4800 		}
4801 	}
4802 
4803 	if (wlimit > 0) {  /* draw rest of line */
4804 		free(wline);
4805 		if (skipcol > width0 + width1) {
4806 			err = format_line(&wline, &width2, &scrollx, seg2,
4807 			    skipcol - (width0 + width1), wlimit,
4808 			    col_tab_align, 1);
4809 			if (err)
4810 				goto done;
4811 			waddwstr(window, &wline[scrollx]);
4812 		} else {
4813 			err = format_line(&wline, &width2, NULL, seg2, 0,
4814 			    wlimit, col_tab_align, 1);
4815 			if (err)
4816 				goto done;
4817 			waddwstr(window, wline);
4818 		}
4819 		*wtotal += width2;
4820 	}
4821 done:
4822 	free(wline);
4823 	free(exstr);
4824 	free(seg0);
4825 	free(seg1);
4826 	free(seg2);
4827 	return err;
4828 }
4829 
4830 static int
4831 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4832 {
4833 	FILE	*f = NULL;
4834 	int	*eof, *first, *selected;
4835 
4836 	if (view->type == TOG_VIEW_DIFF) {
4837 		struct tog_diff_view_state *s = &view->state.diff;
4838 
4839 		first = &s->first_displayed_line;
4840 		selected = first;
4841 		eof = &s->eof;
4842 		f = s->f;
4843 	} else if (view->type == TOG_VIEW_HELP) {
4844 		struct tog_help_view_state *s = &view->state.help;
4845 
4846 		first = &s->first_displayed_line;
4847 		selected = first;
4848 		eof = &s->eof;
4849 		f = s->f;
4850 	} else if (view->type == TOG_VIEW_BLAME) {
4851 		struct tog_blame_view_state *s = &view->state.blame;
4852 
4853 		first = &s->first_displayed_line;
4854 		selected = &s->selected_line;
4855 		eof = &s->eof;
4856 		f = s->blame.f;
4857 	} else
4858 		return 0;
4859 
4860 	/* Center gline in the middle of the page like vi(1). */
4861 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4862 		return 0;
4863 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4864 		rewind(f);
4865 		*eof = 0;
4866 		*first = 1;
4867 		*lineno = 0;
4868 		*nprinted = 0;
4869 		return 0;
4870 	}
4871 
4872 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4873 		view->gline : (view->nlines - 3) / 2 + 1;
4874 	view->gline = 0;
4875 
4876 	return 1;
4877 }
4878 
4879 static const struct got_error *
4880 draw_file(struct tog_view *view, const char *header)
4881 {
4882 	struct tog_diff_view_state *s = &view->state.diff;
4883 	regmatch_t *regmatch = &view->regmatch;
4884 	const struct got_error *err;
4885 	int nprinted = 0;
4886 	char *line;
4887 	size_t linesize = 0;
4888 	ssize_t linelen;
4889 	wchar_t *wline;
4890 	int width;
4891 	int max_lines = view->nlines;
4892 	int nlines = s->nlines;
4893 	off_t line_offset;
4894 
4895 	s->lineno = s->first_displayed_line - 1;
4896 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4897 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4898 		return got_error_from_errno("fseek");
4899 
4900 	werase(view->window);
4901 
4902 	if (view->gline > s->nlines - 1)
4903 		view->gline = s->nlines - 1;
4904 
4905 	if (header) {
4906 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4907 		    1 : view->gline - (view->nlines - 3) / 2 :
4908 		    s->lineno + s->selected_line;
4909 
4910 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4911 			return got_error_from_errno("asprintf");
4912 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4913 		    0, 0);
4914 		free(line);
4915 		if (err)
4916 			return err;
4917 
4918 		if (view_needs_focus_indication(view))
4919 			wstandout(view->window);
4920 		waddwstr(view->window, wline);
4921 		free(wline);
4922 		wline = NULL;
4923 		while (width++ < view->ncols)
4924 			waddch(view->window, ' ');
4925 		if (view_needs_focus_indication(view))
4926 			wstandend(view->window);
4927 
4928 		if (max_lines <= 1)
4929 			return NULL;
4930 		max_lines--;
4931 	}
4932 
4933 	s->eof = 0;
4934 	view->maxx = 0;
4935 	line = NULL;
4936 	while (max_lines > 0 && nprinted < max_lines) {
4937 		enum got_diff_line_type linetype;
4938 		attr_t attr = 0;
4939 
4940 		linelen = getline(&line, &linesize, s->f);
4941 		if (linelen == -1) {
4942 			if (feof(s->f)) {
4943 				s->eof = 1;
4944 				break;
4945 			}
4946 			free(line);
4947 			return got_ferror(s->f, GOT_ERR_IO);
4948 		}
4949 
4950 		if (++s->lineno < s->first_displayed_line)
4951 			continue;
4952 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4953 			continue;
4954 		if (s->lineno == view->hiline)
4955 			attr = A_STANDOUT;
4956 
4957 		/* Set view->maxx based on full line length. */
4958 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4959 		    view->x ? 1 : 0);
4960 		if (err) {
4961 			free(line);
4962 			return err;
4963 		}
4964 		view->maxx = MAX(view->maxx, width);
4965 		free(wline);
4966 		wline = NULL;
4967 
4968 		linetype = s->lines[s->lineno].type;
4969 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4970 		    linetype < GOT_DIFF_LINE_CONTEXT)
4971 			attr |= COLOR_PAIR(linetype);
4972 		if (attr)
4973 			wattron(view->window, attr);
4974 		if (s->first_displayed_line + nprinted == s->matched_line &&
4975 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4976 			err = add_matched_line(&width, line, view->ncols, 0,
4977 			    view->window, view->x, regmatch);
4978 			if (err) {
4979 				free(line);
4980 				return err;
4981 			}
4982 		} else {
4983 			int skip;
4984 			err = format_line(&wline, &width, &skip, line,
4985 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4986 			if (err) {
4987 				free(line);
4988 				return err;
4989 			}
4990 			waddwstr(view->window, &wline[skip]);
4991 			free(wline);
4992 			wline = NULL;
4993 		}
4994 		if (s->lineno == view->hiline) {
4995 			/* highlight full gline length */
4996 			while (width++ < view->ncols)
4997 				waddch(view->window, ' ');
4998 		} else {
4999 			if (width <= view->ncols - 1)
5000 				waddch(view->window, '\n');
5001 		}
5002 		if (attr)
5003 			wattroff(view->window, attr);
5004 		if (++nprinted == 1)
5005 			s->first_displayed_line = s->lineno;
5006 	}
5007 	free(line);
5008 	if (nprinted >= 1)
5009 		s->last_displayed_line = s->first_displayed_line +
5010 		    (nprinted - 1);
5011 	else
5012 		s->last_displayed_line = s->first_displayed_line;
5013 
5014 	view_border(view);
5015 
5016 	if (s->eof) {
5017 		while (nprinted < view->nlines) {
5018 			waddch(view->window, '\n');
5019 			nprinted++;
5020 		}
5021 
5022 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
5023 		    view->ncols, 0, 0);
5024 		if (err) {
5025 			return err;
5026 		}
5027 
5028 		wstandout(view->window);
5029 		waddwstr(view->window, wline);
5030 		free(wline);
5031 		wline = NULL;
5032 		wstandend(view->window);
5033 	}
5034 
5035 	return NULL;
5036 }
5037 
5038 static char *
5039 get_datestr(time_t *time, char *datebuf)
5040 {
5041 	struct tm mytm, *tm;
5042 	char *p, *s;
5043 
5044 	tm = gmtime_r(time, &mytm);
5045 	if (tm == NULL)
5046 		return NULL;
5047 	s = asctime_r(tm, datebuf);
5048 	if (s == NULL)
5049 		return NULL;
5050 	p = strchr(s, '\n');
5051 	if (p)
5052 		*p = '\0';
5053 	return s;
5054 }
5055 
5056 static const struct got_error *
5057 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5058     off_t off, uint8_t type)
5059 {
5060 	struct got_diff_line *p;
5061 
5062 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5063 	if (p == NULL)
5064 		return got_error_from_errno("reallocarray");
5065 	*lines = p;
5066 	(*lines)[*nlines].offset = off;
5067 	(*lines)[*nlines].type = type;
5068 	(*nlines)++;
5069 
5070 	return NULL;
5071 }
5072 
5073 static const struct got_error *
5074 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5075     struct got_diff_line *s_lines, size_t s_nlines)
5076 {
5077 	struct got_diff_line	*p;
5078 	char			 buf[BUFSIZ];
5079 	size_t			 i, r;
5080 
5081 	if (fseeko(src, 0L, SEEK_SET) == -1)
5082 		return got_error_from_errno("fseeko");
5083 
5084 	for (;;) {
5085 		r = fread(buf, 1, sizeof(buf), src);
5086 		if (r == 0) {
5087 			if (ferror(src))
5088 				return got_error_from_errno("fread");
5089 			if (feof(src))
5090 				break;
5091 		}
5092 		if (fwrite(buf, 1, r, dst) != r)
5093 			return got_ferror(dst, GOT_ERR_IO);
5094 	}
5095 
5096 	if (s_nlines == 0 && *d_nlines == 0)
5097 		return NULL;
5098 
5099 	/*
5100 	 * If commit info was in dst, increment line offsets
5101 	 * of the appended diff content, but skip s_lines[0]
5102 	 * because offset zero is already in *d_lines.
5103 	 */
5104 	if (*d_nlines > 0) {
5105 		for (i = 1; i < s_nlines; ++i)
5106 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5107 
5108 		if (s_nlines > 0) {
5109 			--s_nlines;
5110 			++s_lines;
5111 		}
5112 	}
5113 
5114 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5115 	if (p == NULL) {
5116 		/* d_lines is freed in close_diff_view() */
5117 		return got_error_from_errno("reallocarray");
5118 	}
5119 
5120 	*d_lines = p;
5121 
5122 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5123 	*d_nlines += s_nlines;
5124 
5125 	return NULL;
5126 }
5127 
5128 static const struct got_error *
5129 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5130     struct got_object_id *commit_id, struct got_reflist_head *refs,
5131     struct got_repository *repo, int ignore_ws, int force_text_diff,
5132     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5133 {
5134 	const struct got_error *err = NULL;
5135 	char datebuf[26], *datestr;
5136 	struct got_commit_object *commit;
5137 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5138 	time_t committer_time;
5139 	const char *author, *committer;
5140 	char *refs_str = NULL;
5141 	struct got_pathlist_entry *pe;
5142 	off_t outoff = 0;
5143 	int n;
5144 
5145 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5146 	if (err)
5147 		return err;
5148 
5149 	err = got_object_open_as_commit(&commit, repo, commit_id);
5150 	if (err)
5151 		return err;
5152 
5153 	err = got_object_id_str(&id_str, commit_id);
5154 	if (err) {
5155 		err = got_error_from_errno("got_object_id_str");
5156 		goto done;
5157 	}
5158 
5159 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5160 	if (err)
5161 		goto done;
5162 
5163 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5164 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5165 	if (n < 0) {
5166 		err = got_error_from_errno("fprintf");
5167 		goto done;
5168 	}
5169 	outoff += n;
5170 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5171 	if (err)
5172 		goto done;
5173 
5174 	n = fprintf(outfile, "from: %s\n",
5175 	    got_object_commit_get_author(commit));
5176 	if (n < 0) {
5177 		err = got_error_from_errno("fprintf");
5178 		goto done;
5179 	}
5180 	outoff += n;
5181 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5182 	if (err)
5183 		goto done;
5184 
5185 	author = got_object_commit_get_author(commit);
5186 	committer = got_object_commit_get_committer(commit);
5187 	if (strcmp(author, committer) != 0) {
5188 		n = fprintf(outfile, "via: %s\n", committer);
5189 		if (n < 0) {
5190 			err = got_error_from_errno("fprintf");
5191 			goto done;
5192 		}
5193 		outoff += n;
5194 		err = add_line_metadata(lines, nlines, outoff,
5195 		    GOT_DIFF_LINE_AUTHOR);
5196 		if (err)
5197 			goto done;
5198 	}
5199 	committer_time = got_object_commit_get_committer_time(commit);
5200 	datestr = get_datestr(&committer_time, datebuf);
5201 	if (datestr) {
5202 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5203 		if (n < 0) {
5204 			err = got_error_from_errno("fprintf");
5205 			goto done;
5206 		}
5207 		outoff += n;
5208 		err = add_line_metadata(lines, nlines, outoff,
5209 		    GOT_DIFF_LINE_DATE);
5210 		if (err)
5211 			goto done;
5212 	}
5213 	if (got_object_commit_get_nparents(commit) > 1) {
5214 		const struct got_object_id_queue *parent_ids;
5215 		struct got_object_qid *qid;
5216 		int pn = 1;
5217 		parent_ids = got_object_commit_get_parent_ids(commit);
5218 		STAILQ_FOREACH(qid, parent_ids, entry) {
5219 			err = got_object_id_str(&id_str, &qid->id);
5220 			if (err)
5221 				goto done;
5222 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5223 			if (n < 0) {
5224 				err = got_error_from_errno("fprintf");
5225 				goto done;
5226 			}
5227 			outoff += n;
5228 			err = add_line_metadata(lines, nlines, outoff,
5229 			    GOT_DIFF_LINE_META);
5230 			if (err)
5231 				goto done;
5232 			free(id_str);
5233 			id_str = NULL;
5234 		}
5235 	}
5236 
5237 	err = got_object_commit_get_logmsg(&logmsg, commit);
5238 	if (err)
5239 		goto done;
5240 	s = logmsg;
5241 	while ((line = strsep(&s, "\n")) != NULL) {
5242 		n = fprintf(outfile, "%s\n", line);
5243 		if (n < 0) {
5244 			err = got_error_from_errno("fprintf");
5245 			goto done;
5246 		}
5247 		outoff += n;
5248 		err = add_line_metadata(lines, nlines, outoff,
5249 		    GOT_DIFF_LINE_LOGMSG);
5250 		if (err)
5251 			goto done;
5252 	}
5253 
5254 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5255 		struct got_diff_changed_path *cp = pe->data;
5256 		int pad = dsa->max_path_len - pe->path_len + 1;
5257 
5258 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5259 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5260 		    dsa->rm_cols + 1, cp->rm);
5261 		if (n < 0) {
5262 			err = got_error_from_errno("fprintf");
5263 			goto done;
5264 		}
5265 		outoff += n;
5266 		err = add_line_metadata(lines, nlines, outoff,
5267 		    GOT_DIFF_LINE_CHANGES);
5268 		if (err)
5269 			goto done;
5270 	}
5271 
5272 	fputc('\n', outfile);
5273 	outoff++;
5274 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5275 	if (err)
5276 		goto done;
5277 
5278 	n = fprintf(outfile,
5279 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5280 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5281 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5282 	if (n < 0) {
5283 		err = got_error_from_errno("fprintf");
5284 		goto done;
5285 	}
5286 	outoff += n;
5287 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5288 	if (err)
5289 		goto done;
5290 
5291 	fputc('\n', outfile);
5292 	outoff++;
5293 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5294 done:
5295 	free(id_str);
5296 	free(logmsg);
5297 	free(refs_str);
5298 	got_object_commit_close(commit);
5299 	if (err) {
5300 		free(*lines);
5301 		*lines = NULL;
5302 		*nlines = 0;
5303 	}
5304 	return err;
5305 }
5306 
5307 static const struct got_error *
5308 create_diff(struct tog_diff_view_state *s)
5309 {
5310 	const struct got_error *err = NULL;
5311 	FILE *tmp_diff_file = NULL;
5312 	int obj_type;
5313 	struct got_diff_line *lines = NULL;
5314 	struct got_pathlist_head changed_paths;
5315 	struct got_commit_object *commit2 = NULL;
5316 
5317 	TAILQ_INIT(&changed_paths);
5318 
5319 	free(s->lines);
5320 	s->lines = malloc(sizeof(*s->lines));
5321 	if (s->lines == NULL)
5322 		return got_error_from_errno("malloc");
5323 	s->nlines = 0;
5324 
5325 	if (s->f && fclose(s->f) == EOF) {
5326 		s->f = NULL;
5327 		return got_error_from_errno("fclose");
5328 	}
5329 
5330 	s->f = got_opentemp();
5331 	if (s->f == NULL)
5332 		return got_error_from_errno("got_opentemp");
5333 
5334 	tmp_diff_file = got_opentemp();
5335 	if (tmp_diff_file == NULL)
5336 		return got_error_from_errno("got_opentemp");
5337 
5338 	if (s->id1)
5339 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5340 	else
5341 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5342 	if (err)
5343 		goto done;
5344 
5345 	switch (obj_type) {
5346 	case GOT_OBJ_TYPE_BLOB:
5347 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5348 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5349 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5350 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5351 		    s->f);
5352 		break;
5353 	case GOT_OBJ_TYPE_TREE:
5354 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5355 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5356 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5357 		    s->force_text_diff, NULL, s->repo, s->f);
5358 		break;
5359 	case GOT_OBJ_TYPE_COMMIT: {
5360 		const struct got_object_id_queue *parent_ids;
5361 		struct got_object_qid *pid;
5362 		struct got_reflist_head *refs;
5363 		size_t nlines = 0;
5364 		struct got_diffstat_cb_arg dsa = {
5365 			0, 0, 0, 0, 0, 0,
5366 			&changed_paths,
5367 			s->ignore_whitespace,
5368 			s->force_text_diff,
5369 			tog_diff_algo
5370 		};
5371 
5372 		lines = malloc(sizeof(*lines));
5373 		if (lines == NULL) {
5374 			err = got_error_from_errno("malloc");
5375 			goto done;
5376 		}
5377 
5378 		/* build diff first in tmp file then append to commit info */
5379 		err = got_diff_objects_as_commits(&lines, &nlines,
5380 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5381 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5382 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5383 		if (err)
5384 			break;
5385 
5386 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5387 		/* Show commit info if we're diffing to a parent/root commit. */
5388 		if (s->id1 == NULL) {
5389 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5390 			    refs, s->repo, s->ignore_whitespace,
5391 			    s->force_text_diff, &dsa, s->f);
5392 			if (err)
5393 				goto done;
5394 		} else {
5395 			err = got_object_open_as_commit(&commit2, s->repo,
5396 			    s->id2);
5397 			if (err)
5398 				goto done;
5399 
5400 			parent_ids = got_object_commit_get_parent_ids(commit2);
5401 			STAILQ_FOREACH(pid, parent_ids, entry) {
5402 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5403 					err = write_commit_info(&s->lines,
5404 					    &s->nlines, s->id2, refs, s->repo,
5405 					    s->ignore_whitespace,
5406 					    s->force_text_diff, &dsa, s->f);
5407 					if (err)
5408 						goto done;
5409 					break;
5410 				}
5411 			}
5412 		}
5413 
5414 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5415 		    lines, nlines);
5416 		break;
5417 	}
5418 	default:
5419 		err = got_error(GOT_ERR_OBJ_TYPE);
5420 		break;
5421 	}
5422 done:
5423 	free(lines);
5424 	if (commit2 != NULL)
5425 		got_object_commit_close(commit2);
5426 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5427 	if (s->f && fflush(s->f) != 0 && err == NULL)
5428 		err = got_error_from_errno("fflush");
5429 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5430 		err = got_error_from_errno("fclose");
5431 	return err;
5432 }
5433 
5434 static void
5435 diff_view_indicate_progress(struct tog_view *view)
5436 {
5437 	mvwaddstr(view->window, 0, 0, "diffing...");
5438 	update_panels();
5439 	doupdate();
5440 }
5441 
5442 static const struct got_error *
5443 search_start_diff_view(struct tog_view *view)
5444 {
5445 	struct tog_diff_view_state *s = &view->state.diff;
5446 
5447 	s->matched_line = 0;
5448 	return NULL;
5449 }
5450 
5451 static void
5452 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5453     size_t *nlines, int **first, int **last, int **match, int **selected)
5454 {
5455 	struct tog_diff_view_state *s = &view->state.diff;
5456 
5457 	*f = s->f;
5458 	*nlines = s->nlines;
5459 	*line_offsets = NULL;
5460 	*match = &s->matched_line;
5461 	*first = &s->first_displayed_line;
5462 	*last = &s->last_displayed_line;
5463 	*selected = &s->selected_line;
5464 }
5465 
5466 static const struct got_error *
5467 search_next_view_match(struct tog_view *view)
5468 {
5469 	const struct got_error *err = NULL;
5470 	FILE *f;
5471 	int lineno;
5472 	char *line = NULL;
5473 	size_t linesize = 0;
5474 	ssize_t linelen;
5475 	off_t *line_offsets;
5476 	size_t nlines = 0;
5477 	int *first, *last, *match, *selected;
5478 
5479 	if (!view->search_setup)
5480 		return got_error_msg(GOT_ERR_NOT_IMPL,
5481 		    "view search not supported");
5482 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5483 	    &match, &selected);
5484 
5485 	if (!view->searching) {
5486 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5487 		return NULL;
5488 	}
5489 
5490 	if (*match) {
5491 		if (view->searching == TOG_SEARCH_FORWARD)
5492 			lineno = *first + 1;
5493 		else
5494 			lineno = *first - 1;
5495 	} else
5496 		lineno = *first - 1 + *selected;
5497 
5498 	while (1) {
5499 		off_t offset;
5500 
5501 		if (lineno <= 0 || lineno > nlines) {
5502 			if (*match == 0) {
5503 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5504 				break;
5505 			}
5506 
5507 			if (view->searching == TOG_SEARCH_FORWARD)
5508 				lineno = 1;
5509 			else
5510 				lineno = nlines;
5511 		}
5512 
5513 		offset = view->type == TOG_VIEW_DIFF ?
5514 		    view->state.diff.lines[lineno - 1].offset :
5515 		    line_offsets[lineno - 1];
5516 		if (fseeko(f, offset, SEEK_SET) != 0) {
5517 			free(line);
5518 			return got_error_from_errno("fseeko");
5519 		}
5520 		linelen = getline(&line, &linesize, f);
5521 		if (linelen != -1) {
5522 			char *exstr;
5523 			err = expand_tab(&exstr, line);
5524 			if (err)
5525 				break;
5526 			if (match_line(exstr, &view->regex, 1,
5527 			    &view->regmatch)) {
5528 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5529 				*match = lineno;
5530 				free(exstr);
5531 				break;
5532 			}
5533 			free(exstr);
5534 		}
5535 		if (view->searching == TOG_SEARCH_FORWARD)
5536 			lineno++;
5537 		else
5538 			lineno--;
5539 	}
5540 	free(line);
5541 
5542 	if (*match) {
5543 		*first = *match;
5544 		*selected = 1;
5545 	}
5546 
5547 	return err;
5548 }
5549 
5550 static const struct got_error *
5551 close_diff_view(struct tog_view *view)
5552 {
5553 	const struct got_error *err = NULL;
5554 	struct tog_diff_view_state *s = &view->state.diff;
5555 
5556 	free(s->id1);
5557 	s->id1 = NULL;
5558 	free(s->id2);
5559 	s->id2 = NULL;
5560 	if (s->f && fclose(s->f) == EOF)
5561 		err = got_error_from_errno("fclose");
5562 	s->f = NULL;
5563 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5564 		err = got_error_from_errno("fclose");
5565 	s->f1 = NULL;
5566 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5567 		err = got_error_from_errno("fclose");
5568 	s->f2 = NULL;
5569 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5570 		err = got_error_from_errno("close");
5571 	s->fd1 = -1;
5572 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5573 		err = got_error_from_errno("close");
5574 	s->fd2 = -1;
5575 	free(s->lines);
5576 	s->lines = NULL;
5577 	s->nlines = 0;
5578 	return err;
5579 }
5580 
5581 static const struct got_error *
5582 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5583     struct got_object_id *id2, const char *label1, const char *label2,
5584     int diff_context, int ignore_whitespace, int force_text_diff,
5585     struct tog_view *parent_view, struct got_repository *repo)
5586 {
5587 	const struct got_error *err;
5588 	struct tog_diff_view_state *s = &view->state.diff;
5589 
5590 	memset(s, 0, sizeof(*s));
5591 	s->fd1 = -1;
5592 	s->fd2 = -1;
5593 
5594 	if (id1 != NULL && id2 != NULL) {
5595 		int type1, type2;
5596 
5597 		err = got_object_get_type(&type1, repo, id1);
5598 		if (err)
5599 			goto done;
5600 		err = got_object_get_type(&type2, repo, id2);
5601 		if (err)
5602 			goto done;
5603 
5604 		if (type1 != type2) {
5605 			err = got_error(GOT_ERR_OBJ_TYPE);
5606 			goto done;
5607 		}
5608 	}
5609 	s->first_displayed_line = 1;
5610 	s->last_displayed_line = view->nlines;
5611 	s->selected_line = 1;
5612 	s->repo = repo;
5613 	s->label1 = label1;
5614 	s->label2 = label2;
5615 
5616 	if (id1) {
5617 		s->id1 = got_object_id_dup(id1);
5618 		if (s->id1 == NULL) {
5619 			err = got_error_from_errno("got_object_id_dup");
5620 			goto done;
5621 		}
5622 	} else
5623 		s->id1 = NULL;
5624 
5625 	s->id2 = got_object_id_dup(id2);
5626 	if (s->id2 == NULL) {
5627 		err = got_error_from_errno("got_object_id_dup");
5628 		goto done;
5629 	}
5630 
5631 	s->f1 = got_opentemp();
5632 	if (s->f1 == NULL) {
5633 		err = got_error_from_errno("got_opentemp");
5634 		goto done;
5635 	}
5636 
5637 	s->f2 = got_opentemp();
5638 	if (s->f2 == NULL) {
5639 		err = got_error_from_errno("got_opentemp");
5640 		goto done;
5641 	}
5642 
5643 	s->fd1 = got_opentempfd();
5644 	if (s->fd1 == -1) {
5645 		err = got_error_from_errno("got_opentempfd");
5646 		goto done;
5647 	}
5648 
5649 	s->fd2 = got_opentempfd();
5650 	if (s->fd2 == -1) {
5651 		err = got_error_from_errno("got_opentempfd");
5652 		goto done;
5653 	}
5654 
5655 	s->diff_context = diff_context;
5656 	s->ignore_whitespace = ignore_whitespace;
5657 	s->force_text_diff = force_text_diff;
5658 	s->parent_view = parent_view;
5659 	s->repo = repo;
5660 
5661 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5662 		int rc;
5663 
5664 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5665 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5666 		if (rc != ERR)
5667 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5668 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5669 		if (rc != ERR)
5670 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5671 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5672 		if (rc != ERR)
5673 			rc = init_pair(GOT_DIFF_LINE_META,
5674 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5675 		if (rc != ERR)
5676 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5677 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5678 		if (rc != ERR)
5679 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5680 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5681 		if (rc != ERR)
5682 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5683 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5684 		if (rc != ERR)
5685 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5686 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5687 		if (rc != ERR)
5688 			rc = init_pair(GOT_DIFF_LINE_DATE,
5689 			    get_color_value("TOG_COLOR_DATE"), -1);
5690 		if (rc == ERR) {
5691 			err = got_error(GOT_ERR_RANGE);
5692 			goto done;
5693 		}
5694 	}
5695 
5696 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5697 	    view_is_splitscreen(view))
5698 		show_log_view(parent_view); /* draw border */
5699 	diff_view_indicate_progress(view);
5700 
5701 	err = create_diff(s);
5702 
5703 	view->show = show_diff_view;
5704 	view->input = input_diff_view;
5705 	view->reset = reset_diff_view;
5706 	view->close = close_diff_view;
5707 	view->search_start = search_start_diff_view;
5708 	view->search_setup = search_setup_diff_view;
5709 	view->search_next = search_next_view_match;
5710 done:
5711 	if (err) {
5712 		if (view->close == NULL)
5713 			close_diff_view(view);
5714 		view_close(view);
5715 	}
5716 	return err;
5717 }
5718 
5719 static const struct got_error *
5720 show_diff_view(struct tog_view *view)
5721 {
5722 	const struct got_error *err;
5723 	struct tog_diff_view_state *s = &view->state.diff;
5724 	char *id_str1 = NULL, *id_str2, *header;
5725 	const char *label1, *label2;
5726 
5727 	if (s->id1) {
5728 		err = got_object_id_str(&id_str1, s->id1);
5729 		if (err)
5730 			return err;
5731 		label1 = s->label1 ? s->label1 : id_str1;
5732 	} else
5733 		label1 = "/dev/null";
5734 
5735 	err = got_object_id_str(&id_str2, s->id2);
5736 	if (err)
5737 		return err;
5738 	label2 = s->label2 ? s->label2 : id_str2;
5739 
5740 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5741 		err = got_error_from_errno("asprintf");
5742 		free(id_str1);
5743 		free(id_str2);
5744 		return err;
5745 	}
5746 	free(id_str1);
5747 	free(id_str2);
5748 
5749 	err = draw_file(view, header);
5750 	free(header);
5751 	return err;
5752 }
5753 
5754 static const struct got_error *
5755 set_selected_commit(struct tog_diff_view_state *s,
5756     struct commit_queue_entry *entry)
5757 {
5758 	const struct got_error *err;
5759 	const struct got_object_id_queue *parent_ids;
5760 	struct got_commit_object *selected_commit;
5761 	struct got_object_qid *pid;
5762 
5763 	free(s->id2);
5764 	s->id2 = got_object_id_dup(entry->id);
5765 	if (s->id2 == NULL)
5766 		return got_error_from_errno("got_object_id_dup");
5767 
5768 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5769 	if (err)
5770 		return err;
5771 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5772 	free(s->id1);
5773 	pid = STAILQ_FIRST(parent_ids);
5774 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5775 	got_object_commit_close(selected_commit);
5776 	return NULL;
5777 }
5778 
5779 static const struct got_error *
5780 reset_diff_view(struct tog_view *view)
5781 {
5782 	struct tog_diff_view_state *s = &view->state.diff;
5783 
5784 	view->count = 0;
5785 	wclear(view->window);
5786 	s->first_displayed_line = 1;
5787 	s->last_displayed_line = view->nlines;
5788 	s->matched_line = 0;
5789 	diff_view_indicate_progress(view);
5790 	return create_diff(s);
5791 }
5792 
5793 static void
5794 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5795 {
5796 	int start, i;
5797 
5798 	i = start = s->first_displayed_line - 1;
5799 
5800 	while (s->lines[i].type != type) {
5801 		if (i == 0)
5802 			i = s->nlines - 1;
5803 		if (--i == start)
5804 			return; /* do nothing, requested type not in file */
5805 	}
5806 
5807 	s->selected_line = 1;
5808 	s->first_displayed_line = i;
5809 }
5810 
5811 static void
5812 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5813 {
5814 	int start, i;
5815 
5816 	i = start = s->first_displayed_line + 1;
5817 
5818 	while (s->lines[i].type != type) {
5819 		if (i == s->nlines - 1)
5820 			i = 0;
5821 		if (++i == start)
5822 			return; /* do nothing, requested type not in file */
5823 	}
5824 
5825 	s->selected_line = 1;
5826 	s->first_displayed_line = i;
5827 }
5828 
5829 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5830     int, int, int);
5831 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5832     int, int);
5833 
5834 static const struct got_error *
5835 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5836 {
5837 	const struct got_error *err = NULL;
5838 	struct tog_diff_view_state *s = &view->state.diff;
5839 	struct tog_log_view_state *ls;
5840 	struct commit_queue_entry *old_selected_entry;
5841 	char *line = NULL;
5842 	size_t linesize = 0;
5843 	ssize_t linelen;
5844 	int i, nscroll = view->nlines - 1, up = 0;
5845 
5846 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5847 
5848 	switch (ch) {
5849 	case '0':
5850 	case '$':
5851 	case KEY_RIGHT:
5852 	case 'l':
5853 	case KEY_LEFT:
5854 	case 'h':
5855 		horizontal_scroll_input(view, ch);
5856 		break;
5857 	case 'a':
5858 	case 'w':
5859 		if (ch == 'a') {
5860 			s->force_text_diff = !s->force_text_diff;
5861 			view->action = s->force_text_diff ?
5862 			    "force ASCII text enabled" :
5863 			    "force ASCII text disabled";
5864 		}
5865 		else if (ch == 'w') {
5866 			s->ignore_whitespace = !s->ignore_whitespace;
5867 			view->action = s->ignore_whitespace ?
5868 			    "ignore whitespace enabled" :
5869 			    "ignore whitespace disabled";
5870 		}
5871 		err = reset_diff_view(view);
5872 		break;
5873 	case 'g':
5874 	case KEY_HOME:
5875 		s->first_displayed_line = 1;
5876 		view->count = 0;
5877 		break;
5878 	case 'G':
5879 	case KEY_END:
5880 		view->count = 0;
5881 		if (s->eof)
5882 			break;
5883 
5884 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5885 		s->eof = 1;
5886 		break;
5887 	case 'k':
5888 	case KEY_UP:
5889 	case CTRL('p'):
5890 		if (s->first_displayed_line > 1)
5891 			s->first_displayed_line--;
5892 		else
5893 			view->count = 0;
5894 		break;
5895 	case CTRL('u'):
5896 	case 'u':
5897 		nscroll /= 2;
5898 		/* FALL THROUGH */
5899 	case KEY_PPAGE:
5900 	case CTRL('b'):
5901 	case 'b':
5902 		if (s->first_displayed_line == 1) {
5903 			view->count = 0;
5904 			break;
5905 		}
5906 		i = 0;
5907 		while (i++ < nscroll && s->first_displayed_line > 1)
5908 			s->first_displayed_line--;
5909 		break;
5910 	case 'j':
5911 	case KEY_DOWN:
5912 	case CTRL('n'):
5913 		if (!s->eof)
5914 			s->first_displayed_line++;
5915 		else
5916 			view->count = 0;
5917 		break;
5918 	case CTRL('d'):
5919 	case 'd':
5920 		nscroll /= 2;
5921 		/* FALL THROUGH */
5922 	case KEY_NPAGE:
5923 	case CTRL('f'):
5924 	case 'f':
5925 	case ' ':
5926 		if (s->eof) {
5927 			view->count = 0;
5928 			break;
5929 		}
5930 		i = 0;
5931 		while (!s->eof && i++ < nscroll) {
5932 			linelen = getline(&line, &linesize, s->f);
5933 			s->first_displayed_line++;
5934 			if (linelen == -1) {
5935 				if (feof(s->f)) {
5936 					s->eof = 1;
5937 				} else
5938 					err = got_ferror(s->f, GOT_ERR_IO);
5939 				break;
5940 			}
5941 		}
5942 		free(line);
5943 		break;
5944 	case '(':
5945 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5946 		break;
5947 	case ')':
5948 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5949 		break;
5950 	case '{':
5951 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5952 		break;
5953 	case '}':
5954 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5955 		break;
5956 	case '[':
5957 		if (s->diff_context > 0) {
5958 			s->diff_context--;
5959 			s->matched_line = 0;
5960 			diff_view_indicate_progress(view);
5961 			err = create_diff(s);
5962 			if (s->first_displayed_line + view->nlines - 1 >
5963 			    s->nlines) {
5964 				s->first_displayed_line = 1;
5965 				s->last_displayed_line = view->nlines;
5966 			}
5967 		} else
5968 			view->count = 0;
5969 		break;
5970 	case ']':
5971 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5972 			s->diff_context++;
5973 			s->matched_line = 0;
5974 			diff_view_indicate_progress(view);
5975 			err = create_diff(s);
5976 		} else
5977 			view->count = 0;
5978 		break;
5979 	case '<':
5980 	case ',':
5981 	case 'K':
5982 		up = 1;
5983 		/* FALL THROUGH */
5984 	case '>':
5985 	case '.':
5986 	case 'J':
5987 		if (s->parent_view == NULL) {
5988 			view->count = 0;
5989 			break;
5990 		}
5991 		s->parent_view->count = view->count;
5992 
5993 		if (s->parent_view->type == TOG_VIEW_LOG) {
5994 			ls = &s->parent_view->state.log;
5995 			old_selected_entry = ls->selected_entry;
5996 
5997 			err = input_log_view(NULL, s->parent_view,
5998 			    up ? KEY_UP : KEY_DOWN);
5999 			if (err)
6000 				break;
6001 			view->count = s->parent_view->count;
6002 
6003 			if (old_selected_entry == ls->selected_entry)
6004 				break;
6005 
6006 			err = set_selected_commit(s, ls->selected_entry);
6007 			if (err)
6008 				break;
6009 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
6010 			struct tog_blame_view_state *bs;
6011 			struct got_object_id *id, *prev_id;
6012 
6013 			bs = &s->parent_view->state.blame;
6014 			prev_id = get_annotation_for_line(bs->blame.lines,
6015 			    bs->blame.nlines, bs->last_diffed_line);
6016 
6017 			err = input_blame_view(&view, s->parent_view,
6018 			    up ? KEY_UP : KEY_DOWN);
6019 			if (err)
6020 				break;
6021 			view->count = s->parent_view->count;
6022 
6023 			if (prev_id == NULL)
6024 				break;
6025 			id = get_selected_commit_id(bs->blame.lines,
6026 			    bs->blame.nlines, bs->first_displayed_line,
6027 			    bs->selected_line);
6028 			if (id == NULL)
6029 				break;
6030 
6031 			if (!got_object_id_cmp(prev_id, id))
6032 				break;
6033 
6034 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6035 			if (err)
6036 				break;
6037 		}
6038 		s->first_displayed_line = 1;
6039 		s->last_displayed_line = view->nlines;
6040 		s->matched_line = 0;
6041 		view->x = 0;
6042 
6043 		diff_view_indicate_progress(view);
6044 		err = create_diff(s);
6045 		break;
6046 	default:
6047 		view->count = 0;
6048 		break;
6049 	}
6050 
6051 	return err;
6052 }
6053 
6054 static const struct got_error *
6055 cmd_diff(int argc, char *argv[])
6056 {
6057 	const struct got_error *error;
6058 	struct got_repository *repo = NULL;
6059 	struct got_worktree *worktree = NULL;
6060 	struct got_object_id *id1 = NULL, *id2 = NULL;
6061 	char *repo_path = NULL, *cwd = NULL;
6062 	char *id_str1 = NULL, *id_str2 = NULL;
6063 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6064 	char *label1 = NULL, *label2 = NULL;
6065 	int diff_context = 3, ignore_whitespace = 0;
6066 	int ch, force_text_diff = 0;
6067 	const char *errstr;
6068 	struct tog_view *view;
6069 	int *pack_fds = NULL;
6070 
6071 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6072 		switch (ch) {
6073 		case 'a':
6074 			force_text_diff = 1;
6075 			break;
6076 		case 'C':
6077 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6078 			    &errstr);
6079 			if (errstr != NULL)
6080 				errx(1, "number of context lines is %s: %s",
6081 				    errstr, errstr);
6082 			break;
6083 		case 'r':
6084 			repo_path = realpath(optarg, NULL);
6085 			if (repo_path == NULL)
6086 				return got_error_from_errno2("realpath",
6087 				    optarg);
6088 			got_path_strip_trailing_slashes(repo_path);
6089 			break;
6090 		case 'w':
6091 			ignore_whitespace = 1;
6092 			break;
6093 		default:
6094 			usage_diff();
6095 			/* NOTREACHED */
6096 		}
6097 	}
6098 
6099 	argc -= optind;
6100 	argv += optind;
6101 
6102 	if (argc == 0) {
6103 		usage_diff(); /* TODO show local worktree changes */
6104 	} else if (argc == 2) {
6105 		id_str1 = argv[0];
6106 		id_str2 = argv[1];
6107 	} else
6108 		usage_diff();
6109 
6110 	error = got_repo_pack_fds_open(&pack_fds);
6111 	if (error)
6112 		goto done;
6113 
6114 	if (repo_path == NULL) {
6115 		cwd = getcwd(NULL, 0);
6116 		if (cwd == NULL)
6117 			return got_error_from_errno("getcwd");
6118 		error = got_worktree_open(&worktree, cwd, NULL);
6119 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6120 			goto done;
6121 		if (worktree)
6122 			repo_path =
6123 			    strdup(got_worktree_get_repo_path(worktree));
6124 		else
6125 			repo_path = strdup(cwd);
6126 		if (repo_path == NULL) {
6127 			error = got_error_from_errno("strdup");
6128 			goto done;
6129 		}
6130 	}
6131 
6132 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6133 	if (error)
6134 		goto done;
6135 
6136 	init_curses();
6137 
6138 	error = apply_unveil(got_repo_get_path(repo), NULL);
6139 	if (error)
6140 		goto done;
6141 
6142 	error = tog_load_refs(repo, 0);
6143 	if (error)
6144 		goto done;
6145 
6146 	if (id_str1 != NULL) {
6147 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6148 		    repo, worktree);
6149 		if (error != NULL)
6150 			goto done;
6151 		if (keyword_idstr1 != NULL)
6152 			id_str1 = keyword_idstr1;
6153 	}
6154 	if (id_str2 != NULL) {
6155 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6156 		    repo, worktree);
6157 		if (error != NULL)
6158 			goto done;
6159 		if (keyword_idstr2 != NULL)
6160 			id_str2 = keyword_idstr2;
6161 	}
6162 
6163 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6164 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6165 	if (error)
6166 		goto done;
6167 
6168 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6169 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6170 	if (error)
6171 		goto done;
6172 
6173 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6174 	if (view == NULL) {
6175 		error = got_error_from_errno("view_open");
6176 		goto done;
6177 	}
6178 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6179 	    ignore_whitespace, force_text_diff, NULL,  repo);
6180 	if (error)
6181 		goto done;
6182 
6183 	if (worktree) {
6184 		error = set_tog_base_commit(repo, worktree);
6185 		if (error != NULL)
6186 			goto done;
6187 
6188 		/* Release work tree lock. */
6189 		got_worktree_close(worktree);
6190 		worktree = NULL;
6191 	}
6192 
6193 	error = view_loop(view);
6194 
6195 done:
6196 	free(tog_base_commit.id);
6197 	free(keyword_idstr1);
6198 	free(keyword_idstr2);
6199 	free(label1);
6200 	free(label2);
6201 	free(id1);
6202 	free(id2);
6203 	free(repo_path);
6204 	free(cwd);
6205 	if (repo) {
6206 		const struct got_error *close_err = got_repo_close(repo);
6207 		if (error == NULL)
6208 			error = close_err;
6209 	}
6210 	if (worktree)
6211 		got_worktree_close(worktree);
6212 	if (pack_fds) {
6213 		const struct got_error *pack_err =
6214 		    got_repo_pack_fds_close(pack_fds);
6215 		if (error == NULL)
6216 			error = pack_err;
6217 	}
6218 	tog_free_refs();
6219 	return error;
6220 }
6221 
6222 __dead static void
6223 usage_blame(void)
6224 {
6225 	endwin();
6226 	fprintf(stderr,
6227 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6228 	    getprogname());
6229 	exit(1);
6230 }
6231 
6232 struct tog_blame_line {
6233 	int annotated;
6234 	struct got_object_id *id;
6235 };
6236 
6237 static const struct got_error *
6238 draw_blame(struct tog_view *view)
6239 {
6240 	struct tog_blame_view_state *s = &view->state.blame;
6241 	struct tog_blame *blame = &s->blame;
6242 	regmatch_t *regmatch = &view->regmatch;
6243 	const struct got_error *err;
6244 	int lineno = 0, nprinted = 0;
6245 	char *line = NULL;
6246 	size_t linesize = 0;
6247 	ssize_t linelen;
6248 	wchar_t *wline;
6249 	int width;
6250 	struct tog_blame_line *blame_line;
6251 	struct got_object_id *prev_id = NULL;
6252 	char *id_str;
6253 	struct tog_color *tc;
6254 
6255 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6256 	if (err)
6257 		return err;
6258 
6259 	rewind(blame->f);
6260 	werase(view->window);
6261 
6262 	if (asprintf(&line, "commit %s", id_str) == -1) {
6263 		err = got_error_from_errno("asprintf");
6264 		free(id_str);
6265 		return err;
6266 	}
6267 
6268 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6269 	free(line);
6270 	line = NULL;
6271 	if (err)
6272 		return err;
6273 	if (view_needs_focus_indication(view))
6274 		wstandout(view->window);
6275 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6276 	if (tc)
6277 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6278 	waddwstr(view->window, wline);
6279 	while (width++ < view->ncols)
6280 		waddch(view->window, ' ');
6281 	if (tc)
6282 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6283 	if (view_needs_focus_indication(view))
6284 		wstandend(view->window);
6285 	free(wline);
6286 	wline = NULL;
6287 
6288 	if (view->gline > blame->nlines)
6289 		view->gline = blame->nlines;
6290 
6291 	if (tog_io.wait_for_ui) {
6292 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6293 		int rc;
6294 
6295 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6296 		if (rc)
6297 			return got_error_set_errno(rc, "pthread_cond_wait");
6298 		tog_io.wait_for_ui = 0;
6299 	}
6300 
6301 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6302 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6303 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6304 		free(id_str);
6305 		return got_error_from_errno("asprintf");
6306 	}
6307 	free(id_str);
6308 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6309 	free(line);
6310 	line = NULL;
6311 	if (err)
6312 		return err;
6313 	waddwstr(view->window, wline);
6314 	free(wline);
6315 	wline = NULL;
6316 	if (width < view->ncols - 1)
6317 		waddch(view->window, '\n');
6318 
6319 	s->eof = 0;
6320 	view->maxx = 0;
6321 	while (nprinted < view->nlines - 2) {
6322 		linelen = getline(&line, &linesize, blame->f);
6323 		if (linelen == -1) {
6324 			if (feof(blame->f)) {
6325 				s->eof = 1;
6326 				break;
6327 			}
6328 			free(line);
6329 			return got_ferror(blame->f, GOT_ERR_IO);
6330 		}
6331 		if (++lineno < s->first_displayed_line)
6332 			continue;
6333 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6334 			continue;
6335 
6336 		/* Set view->maxx based on full line length. */
6337 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6338 		if (err) {
6339 			free(line);
6340 			return err;
6341 		}
6342 		free(wline);
6343 		wline = NULL;
6344 		view->maxx = MAX(view->maxx, width);
6345 
6346 		if (nprinted == s->selected_line - 1)
6347 			wstandout(view->window);
6348 
6349 		if (blame->nlines > 0) {
6350 			blame_line = &blame->lines[lineno - 1];
6351 			if (blame_line->annotated && prev_id &&
6352 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6353 			    !(nprinted == s->selected_line - 1)) {
6354 				waddstr(view->window, "        ");
6355 			} else if (blame_line->annotated) {
6356 				char *id_str;
6357 				err = got_object_id_str(&id_str,
6358 				    blame_line->id);
6359 				if (err) {
6360 					free(line);
6361 					return err;
6362 				}
6363 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6364 				if (tc)
6365 					wattr_on(view->window,
6366 					    COLOR_PAIR(tc->colorpair), NULL);
6367 				wprintw(view->window, "%.8s", id_str);
6368 				if (tc)
6369 					wattr_off(view->window,
6370 					    COLOR_PAIR(tc->colorpair), NULL);
6371 				free(id_str);
6372 				prev_id = blame_line->id;
6373 			} else {
6374 				waddstr(view->window, "........");
6375 				prev_id = NULL;
6376 			}
6377 		} else {
6378 			waddstr(view->window, "........");
6379 			prev_id = NULL;
6380 		}
6381 
6382 		if (nprinted == s->selected_line - 1)
6383 			wstandend(view->window);
6384 		waddstr(view->window, " ");
6385 
6386 		if (view->ncols <= 9) {
6387 			width = 9;
6388 		} else if (s->first_displayed_line + nprinted ==
6389 		    s->matched_line &&
6390 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6391 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6392 			    view->window, view->x, regmatch);
6393 			if (err) {
6394 				free(line);
6395 				return err;
6396 			}
6397 			width += 9;
6398 		} else {
6399 			int skip;
6400 			err = format_line(&wline, &width, &skip, line,
6401 			    view->x, view->ncols - 9, 9, 1);
6402 			if (err) {
6403 				free(line);
6404 				return err;
6405 			}
6406 			waddwstr(view->window, &wline[skip]);
6407 			width += 9;
6408 			free(wline);
6409 			wline = NULL;
6410 		}
6411 
6412 		if (width <= view->ncols - 1)
6413 			waddch(view->window, '\n');
6414 		if (++nprinted == 1)
6415 			s->first_displayed_line = lineno;
6416 	}
6417 	free(line);
6418 	s->last_displayed_line = lineno;
6419 
6420 	view_border(view);
6421 
6422 	return NULL;
6423 }
6424 
6425 static const struct got_error *
6426 blame_cb(void *arg, int nlines, int lineno,
6427     struct got_commit_object *commit, struct got_object_id *id)
6428 {
6429 	const struct got_error *err = NULL;
6430 	struct tog_blame_cb_args *a = arg;
6431 	struct tog_blame_line *line;
6432 	int errcode;
6433 
6434 	if (nlines != a->nlines ||
6435 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6436 		return got_error(GOT_ERR_RANGE);
6437 
6438 	errcode = pthread_mutex_lock(&tog_mutex);
6439 	if (errcode)
6440 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6441 
6442 	if (*a->quit) {	/* user has quit the blame view */
6443 		err = got_error(GOT_ERR_ITER_COMPLETED);
6444 		goto done;
6445 	}
6446 
6447 	if (lineno == -1)
6448 		goto done; /* no change in this commit */
6449 
6450 	line = &a->lines[lineno - 1];
6451 	if (line->annotated)
6452 		goto done;
6453 
6454 	line->id = got_object_id_dup(id);
6455 	if (line->id == NULL) {
6456 		err = got_error_from_errno("got_object_id_dup");
6457 		goto done;
6458 	}
6459 	line->annotated = 1;
6460 done:
6461 	errcode = pthread_mutex_unlock(&tog_mutex);
6462 	if (errcode)
6463 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6464 	return err;
6465 }
6466 
6467 static void *
6468 blame_thread(void *arg)
6469 {
6470 	const struct got_error *err, *close_err;
6471 	struct tog_blame_thread_args *ta = arg;
6472 	struct tog_blame_cb_args *a = ta->cb_args;
6473 	int errcode, fd1 = -1, fd2 = -1;
6474 	FILE *f1 = NULL, *f2 = NULL;
6475 
6476 	fd1 = got_opentempfd();
6477 	if (fd1 == -1)
6478 		return (void *)got_error_from_errno("got_opentempfd");
6479 
6480 	fd2 = got_opentempfd();
6481 	if (fd2 == -1) {
6482 		err = got_error_from_errno("got_opentempfd");
6483 		goto done;
6484 	}
6485 
6486 	f1 = got_opentemp();
6487 	if (f1 == NULL) {
6488 		err = (void *)got_error_from_errno("got_opentemp");
6489 		goto done;
6490 	}
6491 	f2 = got_opentemp();
6492 	if (f2 == NULL) {
6493 		err = (void *)got_error_from_errno("got_opentemp");
6494 		goto done;
6495 	}
6496 
6497 	err = block_signals_used_by_main_thread();
6498 	if (err)
6499 		goto done;
6500 
6501 	err = got_blame(ta->path, a->commit_id, ta->repo,
6502 	    tog_diff_algo, blame_cb, ta->cb_args,
6503 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6504 	if (err && err->code == GOT_ERR_CANCELLED)
6505 		err = NULL;
6506 
6507 	errcode = pthread_mutex_lock(&tog_mutex);
6508 	if (errcode) {
6509 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6510 		goto done;
6511 	}
6512 
6513 	close_err = got_repo_close(ta->repo);
6514 	if (err == NULL)
6515 		err = close_err;
6516 	ta->repo = NULL;
6517 	*ta->complete = 1;
6518 
6519 	if (tog_io.wait_for_ui) {
6520 		errcode = pthread_cond_signal(&ta->blame_complete);
6521 		if (errcode && err == NULL)
6522 			err = got_error_set_errno(errcode,
6523 			    "pthread_cond_signal");
6524 	}
6525 
6526 	errcode = pthread_mutex_unlock(&tog_mutex);
6527 	if (errcode && err == NULL)
6528 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6529 
6530 done:
6531 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6532 		err = got_error_from_errno("close");
6533 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6534 		err = got_error_from_errno("close");
6535 	if (f1 && fclose(f1) == EOF && err == NULL)
6536 		err = got_error_from_errno("fclose");
6537 	if (f2 && fclose(f2) == EOF && err == NULL)
6538 		err = got_error_from_errno("fclose");
6539 
6540 	return (void *)err;
6541 }
6542 
6543 static struct got_object_id *
6544 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6545     int first_displayed_line, int selected_line)
6546 {
6547 	struct tog_blame_line *line;
6548 
6549 	if (nlines <= 0)
6550 		return NULL;
6551 
6552 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6553 	if (!line->annotated)
6554 		return NULL;
6555 
6556 	return line->id;
6557 }
6558 
6559 static struct got_object_id *
6560 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6561     int lineno)
6562 {
6563 	struct tog_blame_line *line;
6564 
6565 	if (nlines <= 0 || lineno >= nlines)
6566 		return NULL;
6567 
6568 	line = &lines[lineno - 1];
6569 	if (!line->annotated)
6570 		return NULL;
6571 
6572 	return line->id;
6573 }
6574 
6575 static const struct got_error *
6576 stop_blame(struct tog_blame *blame)
6577 {
6578 	const struct got_error *err = NULL;
6579 	int i;
6580 
6581 	if (blame->thread) {
6582 		int errcode;
6583 		errcode = pthread_mutex_unlock(&tog_mutex);
6584 		if (errcode)
6585 			return got_error_set_errno(errcode,
6586 			    "pthread_mutex_unlock");
6587 		errcode = pthread_join(blame->thread, (void **)&err);
6588 		if (errcode)
6589 			return got_error_set_errno(errcode, "pthread_join");
6590 		errcode = pthread_mutex_lock(&tog_mutex);
6591 		if (errcode)
6592 			return got_error_set_errno(errcode,
6593 			    "pthread_mutex_lock");
6594 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6595 			err = NULL;
6596 		blame->thread = 0; //NULL;
6597 	}
6598 	if (blame->thread_args.repo) {
6599 		const struct got_error *close_err;
6600 		close_err = got_repo_close(blame->thread_args.repo);
6601 		if (err == NULL)
6602 			err = close_err;
6603 		blame->thread_args.repo = NULL;
6604 	}
6605 	if (blame->f) {
6606 		if (fclose(blame->f) == EOF && err == NULL)
6607 			err = got_error_from_errno("fclose");
6608 		blame->f = NULL;
6609 	}
6610 	if (blame->lines) {
6611 		for (i = 0; i < blame->nlines; i++)
6612 			free(blame->lines[i].id);
6613 		free(blame->lines);
6614 		blame->lines = NULL;
6615 	}
6616 	free(blame->cb_args.commit_id);
6617 	blame->cb_args.commit_id = NULL;
6618 	if (blame->pack_fds) {
6619 		const struct got_error *pack_err =
6620 		    got_repo_pack_fds_close(blame->pack_fds);
6621 		if (err == NULL)
6622 			err = pack_err;
6623 		blame->pack_fds = NULL;
6624 	}
6625 	free(blame->line_offsets);
6626 	blame->line_offsets = NULL;
6627 	return err;
6628 }
6629 
6630 static const struct got_error *
6631 cancel_blame_view(void *arg)
6632 {
6633 	const struct got_error *err = NULL;
6634 	int *done = arg;
6635 	int errcode;
6636 
6637 	errcode = pthread_mutex_lock(&tog_mutex);
6638 	if (errcode)
6639 		return got_error_set_errno(errcode,
6640 		    "pthread_mutex_unlock");
6641 
6642 	if (*done)
6643 		err = got_error(GOT_ERR_CANCELLED);
6644 
6645 	errcode = pthread_mutex_unlock(&tog_mutex);
6646 	if (errcode)
6647 		return got_error_set_errno(errcode,
6648 		    "pthread_mutex_lock");
6649 
6650 	return err;
6651 }
6652 
6653 static const struct got_error *
6654 run_blame(struct tog_view *view)
6655 {
6656 	struct tog_blame_view_state *s = &view->state.blame;
6657 	struct tog_blame *blame = &s->blame;
6658 	const struct got_error *err = NULL;
6659 	struct got_commit_object *commit = NULL;
6660 	struct got_blob_object *blob = NULL;
6661 	struct got_repository *thread_repo = NULL;
6662 	struct got_object_id *obj_id = NULL;
6663 	int obj_type, fd = -1;
6664 	int *pack_fds = NULL;
6665 
6666 	err = got_object_open_as_commit(&commit, s->repo,
6667 	    &s->blamed_commit->id);
6668 	if (err)
6669 		return err;
6670 
6671 	fd = got_opentempfd();
6672 	if (fd == -1) {
6673 		err = got_error_from_errno("got_opentempfd");
6674 		goto done;
6675 	}
6676 
6677 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6678 	if (err)
6679 		goto done;
6680 
6681 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6682 	if (err)
6683 		goto done;
6684 
6685 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6686 		err = got_error(GOT_ERR_OBJ_TYPE);
6687 		goto done;
6688 	}
6689 
6690 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6691 	if (err)
6692 		goto done;
6693 	blame->f = got_opentemp();
6694 	if (blame->f == NULL) {
6695 		err = got_error_from_errno("got_opentemp");
6696 		goto done;
6697 	}
6698 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6699 	    &blame->line_offsets, blame->f, blob);
6700 	if (err)
6701 		goto done;
6702 	if (blame->nlines == 0) {
6703 		s->blame_complete = 1;
6704 		goto done;
6705 	}
6706 
6707 	/* Don't include \n at EOF in the blame line count. */
6708 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6709 		blame->nlines--;
6710 
6711 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6712 	if (blame->lines == NULL) {
6713 		err = got_error_from_errno("calloc");
6714 		goto done;
6715 	}
6716 
6717 	err = got_repo_pack_fds_open(&pack_fds);
6718 	if (err)
6719 		goto done;
6720 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6721 	    pack_fds);
6722 	if (err)
6723 		goto done;
6724 
6725 	blame->pack_fds = pack_fds;
6726 	blame->cb_args.view = view;
6727 	blame->cb_args.lines = blame->lines;
6728 	blame->cb_args.nlines = blame->nlines;
6729 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6730 	if (blame->cb_args.commit_id == NULL) {
6731 		err = got_error_from_errno("got_object_id_dup");
6732 		goto done;
6733 	}
6734 	blame->cb_args.quit = &s->done;
6735 
6736 	blame->thread_args.path = s->path;
6737 	blame->thread_args.repo = thread_repo;
6738 	blame->thread_args.cb_args = &blame->cb_args;
6739 	blame->thread_args.complete = &s->blame_complete;
6740 	blame->thread_args.cancel_cb = cancel_blame_view;
6741 	blame->thread_args.cancel_arg = &s->done;
6742 	s->blame_complete = 0;
6743 
6744 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6745 		s->first_displayed_line = 1;
6746 		s->last_displayed_line = view->nlines;
6747 		s->selected_line = 1;
6748 	}
6749 	s->matched_line = 0;
6750 
6751 done:
6752 	if (commit)
6753 		got_object_commit_close(commit);
6754 	if (fd != -1 && close(fd) == -1 && err == NULL)
6755 		err = got_error_from_errno("close");
6756 	if (blob)
6757 		got_object_blob_close(blob);
6758 	free(obj_id);
6759 	if (err)
6760 		stop_blame(blame);
6761 	return err;
6762 }
6763 
6764 static const struct got_error *
6765 open_blame_view(struct tog_view *view, char *path,
6766     struct got_object_id *commit_id, struct got_repository *repo)
6767 {
6768 	const struct got_error *err = NULL;
6769 	struct tog_blame_view_state *s = &view->state.blame;
6770 
6771 	STAILQ_INIT(&s->blamed_commits);
6772 
6773 	s->path = strdup(path);
6774 	if (s->path == NULL)
6775 		return got_error_from_errno("strdup");
6776 
6777 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6778 	if (err) {
6779 		free(s->path);
6780 		return err;
6781 	}
6782 
6783 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6784 	s->first_displayed_line = 1;
6785 	s->last_displayed_line = view->nlines;
6786 	s->selected_line = 1;
6787 	s->blame_complete = 0;
6788 	s->repo = repo;
6789 	s->commit_id = commit_id;
6790 	memset(&s->blame, 0, sizeof(s->blame));
6791 
6792 	STAILQ_INIT(&s->colors);
6793 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6794 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6795 		    get_color_value("TOG_COLOR_COMMIT"));
6796 		if (err)
6797 			return err;
6798 	}
6799 
6800 	view->show = show_blame_view;
6801 	view->input = input_blame_view;
6802 	view->reset = reset_blame_view;
6803 	view->close = close_blame_view;
6804 	view->search_start = search_start_blame_view;
6805 	view->search_setup = search_setup_blame_view;
6806 	view->search_next = search_next_view_match;
6807 
6808 	if (using_mock_io) {
6809 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6810 		int rc;
6811 
6812 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6813 		if (rc)
6814 			return got_error_set_errno(rc, "pthread_cond_init");
6815 	}
6816 
6817 	return run_blame(view);
6818 }
6819 
6820 static const struct got_error *
6821 close_blame_view(struct tog_view *view)
6822 {
6823 	const struct got_error *err = NULL;
6824 	struct tog_blame_view_state *s = &view->state.blame;
6825 
6826 	if (s->blame.thread)
6827 		err = stop_blame(&s->blame);
6828 
6829 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6830 		struct got_object_qid *blamed_commit;
6831 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6832 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6833 		got_object_qid_free(blamed_commit);
6834 	}
6835 
6836 	if (using_mock_io) {
6837 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6838 		int rc;
6839 
6840 		rc = pthread_cond_destroy(&bta->blame_complete);
6841 		if (rc && err == NULL)
6842 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6843 	}
6844 
6845 	free(s->path);
6846 	free_colors(&s->colors);
6847 	return err;
6848 }
6849 
6850 static const struct got_error *
6851 search_start_blame_view(struct tog_view *view)
6852 {
6853 	struct tog_blame_view_state *s = &view->state.blame;
6854 
6855 	s->matched_line = 0;
6856 	return NULL;
6857 }
6858 
6859 static void
6860 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6861     size_t *nlines, int **first, int **last, int **match, int **selected)
6862 {
6863 	struct tog_blame_view_state *s = &view->state.blame;
6864 
6865 	*f = s->blame.f;
6866 	*nlines = s->blame.nlines;
6867 	*line_offsets = s->blame.line_offsets;
6868 	*match = &s->matched_line;
6869 	*first = &s->first_displayed_line;
6870 	*last = &s->last_displayed_line;
6871 	*selected = &s->selected_line;
6872 }
6873 
6874 static const struct got_error *
6875 show_blame_view(struct tog_view *view)
6876 {
6877 	const struct got_error *err = NULL;
6878 	struct tog_blame_view_state *s = &view->state.blame;
6879 	int errcode;
6880 
6881 	if (s->blame.thread == 0 && !s->blame_complete) {
6882 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6883 		    &s->blame.thread_args);
6884 		if (errcode)
6885 			return got_error_set_errno(errcode, "pthread_create");
6886 
6887 		if (!using_mock_io)
6888 			halfdelay(1); /* fast refresh while annotating  */
6889 	}
6890 
6891 	if (s->blame_complete && !using_mock_io)
6892 		halfdelay(10); /* disable fast refresh */
6893 
6894 	err = draw_blame(view);
6895 
6896 	view_border(view);
6897 	return err;
6898 }
6899 
6900 static const struct got_error *
6901 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6902     struct got_repository *repo, struct got_object_id *id)
6903 {
6904 	struct tog_view		*log_view;
6905 	const struct got_error	*err = NULL;
6906 
6907 	*new_view = NULL;
6908 
6909 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6910 	if (log_view == NULL)
6911 		return got_error_from_errno("view_open");
6912 
6913 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6914 	if (err)
6915 		view_close(log_view);
6916 	else
6917 		*new_view = log_view;
6918 
6919 	return err;
6920 }
6921 
6922 static const struct got_error *
6923 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6924 {
6925 	const struct got_error *err = NULL, *thread_err = NULL;
6926 	struct tog_view *diff_view;
6927 	struct tog_blame_view_state *s = &view->state.blame;
6928 	int eos, nscroll, begin_y = 0, begin_x = 0;
6929 
6930 	eos = nscroll = view->nlines - 2;
6931 	if (view_is_hsplit_top(view))
6932 		--eos;  /* border */
6933 
6934 	switch (ch) {
6935 	case '0':
6936 	case '$':
6937 	case KEY_RIGHT:
6938 	case 'l':
6939 	case KEY_LEFT:
6940 	case 'h':
6941 		horizontal_scroll_input(view, ch);
6942 		break;
6943 	case 'q':
6944 		s->done = 1;
6945 		break;
6946 	case 'g':
6947 	case KEY_HOME:
6948 		s->selected_line = 1;
6949 		s->first_displayed_line = 1;
6950 		view->count = 0;
6951 		break;
6952 	case 'G':
6953 	case KEY_END:
6954 		if (s->blame.nlines < eos) {
6955 			s->selected_line = s->blame.nlines;
6956 			s->first_displayed_line = 1;
6957 		} else {
6958 			s->selected_line = eos;
6959 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6960 		}
6961 		view->count = 0;
6962 		break;
6963 	case 'k':
6964 	case KEY_UP:
6965 	case CTRL('p'):
6966 		if (s->selected_line > 1)
6967 			s->selected_line--;
6968 		else if (s->selected_line == 1 &&
6969 		    s->first_displayed_line > 1)
6970 			s->first_displayed_line--;
6971 		else
6972 			view->count = 0;
6973 		break;
6974 	case CTRL('u'):
6975 	case 'u':
6976 		nscroll /= 2;
6977 		/* FALL THROUGH */
6978 	case KEY_PPAGE:
6979 	case CTRL('b'):
6980 	case 'b':
6981 		if (s->first_displayed_line == 1) {
6982 			if (view->count > 1)
6983 				nscroll += nscroll;
6984 			s->selected_line = MAX(1, s->selected_line - nscroll);
6985 			view->count = 0;
6986 			break;
6987 		}
6988 		if (s->first_displayed_line > nscroll)
6989 			s->first_displayed_line -= nscroll;
6990 		else
6991 			s->first_displayed_line = 1;
6992 		break;
6993 	case 'j':
6994 	case KEY_DOWN:
6995 	case CTRL('n'):
6996 		if (s->selected_line < eos && s->first_displayed_line +
6997 		    s->selected_line <= s->blame.nlines)
6998 			s->selected_line++;
6999 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
7000 			s->first_displayed_line++;
7001 		else
7002 			view->count = 0;
7003 		break;
7004 	case 'c':
7005 	case 'p': {
7006 		struct got_object_id *id = NULL;
7007 
7008 		view->count = 0;
7009 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7010 		    s->first_displayed_line, s->selected_line);
7011 		if (id == NULL)
7012 			break;
7013 		if (ch == 'p') {
7014 			struct got_commit_object *commit, *pcommit;
7015 			struct got_object_qid *pid;
7016 			struct got_object_id *blob_id = NULL;
7017 			int obj_type;
7018 			err = got_object_open_as_commit(&commit,
7019 			    s->repo, id);
7020 			if (err)
7021 				break;
7022 			pid = STAILQ_FIRST(
7023 			    got_object_commit_get_parent_ids(commit));
7024 			if (pid == NULL) {
7025 				got_object_commit_close(commit);
7026 				break;
7027 			}
7028 			/* Check if path history ends here. */
7029 			err = got_object_open_as_commit(&pcommit,
7030 			    s->repo, &pid->id);
7031 			if (err)
7032 				break;
7033 			err = got_object_id_by_path(&blob_id, s->repo,
7034 			    pcommit, s->path);
7035 			got_object_commit_close(pcommit);
7036 			if (err) {
7037 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7038 					err = NULL;
7039 				got_object_commit_close(commit);
7040 				break;
7041 			}
7042 			err = got_object_get_type(&obj_type, s->repo,
7043 			    blob_id);
7044 			free(blob_id);
7045 			/* Can't blame non-blob type objects. */
7046 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7047 				got_object_commit_close(commit);
7048 				break;
7049 			}
7050 			err = got_object_qid_alloc(&s->blamed_commit,
7051 			    &pid->id);
7052 			got_object_commit_close(commit);
7053 		} else {
7054 			if (got_object_id_cmp(id,
7055 			    &s->blamed_commit->id) == 0)
7056 				break;
7057 			err = got_object_qid_alloc(&s->blamed_commit,
7058 			    id);
7059 		}
7060 		if (err)
7061 			break;
7062 		s->done = 1;
7063 		thread_err = stop_blame(&s->blame);
7064 		s->done = 0;
7065 		if (thread_err)
7066 			break;
7067 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7068 		    s->blamed_commit, entry);
7069 		err = run_blame(view);
7070 		if (err)
7071 			break;
7072 		break;
7073 	}
7074 	case 'C': {
7075 		struct got_object_qid *first;
7076 
7077 		view->count = 0;
7078 		first = STAILQ_FIRST(&s->blamed_commits);
7079 		if (!got_object_id_cmp(&first->id, s->commit_id))
7080 			break;
7081 		s->done = 1;
7082 		thread_err = stop_blame(&s->blame);
7083 		s->done = 0;
7084 		if (thread_err)
7085 			break;
7086 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7087 		got_object_qid_free(s->blamed_commit);
7088 		s->blamed_commit =
7089 		    STAILQ_FIRST(&s->blamed_commits);
7090 		err = run_blame(view);
7091 		if (err)
7092 			break;
7093 		break;
7094 	}
7095 	case 'L':
7096 		view->count = 0;
7097 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7098 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7099 		if (s->id_to_log)
7100 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7101 		break;
7102 	case KEY_ENTER:
7103 	case '\r': {
7104 		struct got_object_id *id = NULL;
7105 		struct got_object_qid *pid;
7106 		struct got_commit_object *commit = NULL;
7107 
7108 		view->count = 0;
7109 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7110 		    s->first_displayed_line, s->selected_line);
7111 		if (id == NULL)
7112 			break;
7113 		err = got_object_open_as_commit(&commit, s->repo, id);
7114 		if (err)
7115 			break;
7116 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7117 		if (*new_view) {
7118 			/* traversed from diff view, release diff resources  */
7119 			err = close_diff_view(*new_view);
7120 			if (err)
7121 				break;
7122 			diff_view = *new_view;
7123 		} else {
7124 			if (view_is_parent_view(view))
7125 				view_get_split(view, &begin_y, &begin_x);
7126 
7127 			diff_view = view_open(0, 0, begin_y, begin_x,
7128 			    TOG_VIEW_DIFF);
7129 			if (diff_view == NULL) {
7130 				got_object_commit_close(commit);
7131 				err = got_error_from_errno("view_open");
7132 				break;
7133 			}
7134 		}
7135 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7136 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7137 		got_object_commit_close(commit);
7138 		if (err)
7139 			break;
7140 		s->last_diffed_line = s->first_displayed_line - 1 +
7141 		    s->selected_line;
7142 		if (*new_view)
7143 			break;	/* still open from active diff view */
7144 		if (view_is_parent_view(view) &&
7145 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7146 			err = view_init_hsplit(view, begin_y);
7147 			if (err)
7148 				break;
7149 		}
7150 
7151 		view->focussed = 0;
7152 		diff_view->focussed = 1;
7153 		diff_view->mode = view->mode;
7154 		diff_view->nlines = view->lines - begin_y;
7155 		if (view_is_parent_view(view)) {
7156 			view_transfer_size(diff_view, view);
7157 			err = view_close_child(view);
7158 			if (err)
7159 				break;
7160 			err = view_set_child(view, diff_view);
7161 			if (err)
7162 				break;
7163 			view->focus_child = 1;
7164 		} else
7165 			*new_view = diff_view;
7166 		if (err)
7167 			break;
7168 		break;
7169 	}
7170 	case CTRL('d'):
7171 	case 'd':
7172 		nscroll /= 2;
7173 		/* FALL THROUGH */
7174 	case KEY_NPAGE:
7175 	case CTRL('f'):
7176 	case 'f':
7177 	case ' ':
7178 		if (s->last_displayed_line >= s->blame.nlines &&
7179 		    s->selected_line >= MIN(s->blame.nlines,
7180 		    view->nlines - 2)) {
7181 			view->count = 0;
7182 			break;
7183 		}
7184 		if (s->last_displayed_line >= s->blame.nlines &&
7185 		    s->selected_line < view->nlines - 2) {
7186 			s->selected_line +=
7187 			    MIN(nscroll, s->last_displayed_line -
7188 			    s->first_displayed_line - s->selected_line + 1);
7189 		}
7190 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7191 			s->first_displayed_line += nscroll;
7192 		else
7193 			s->first_displayed_line =
7194 			    s->blame.nlines - (view->nlines - 3);
7195 		break;
7196 	case KEY_RESIZE:
7197 		if (s->selected_line > view->nlines - 2) {
7198 			s->selected_line = MIN(s->blame.nlines,
7199 			    view->nlines - 2);
7200 		}
7201 		break;
7202 	default:
7203 		view->count = 0;
7204 		break;
7205 	}
7206 	return thread_err ? thread_err : err;
7207 }
7208 
7209 static const struct got_error *
7210 reset_blame_view(struct tog_view *view)
7211 {
7212 	const struct got_error *err;
7213 	struct tog_blame_view_state *s = &view->state.blame;
7214 
7215 	view->count = 0;
7216 	s->done = 1;
7217 	err = stop_blame(&s->blame);
7218 	s->done = 0;
7219 	if (err)
7220 		return err;
7221 	return run_blame(view);
7222 }
7223 
7224 static const struct got_error *
7225 cmd_blame(int argc, char *argv[])
7226 {
7227 	const struct got_error *error;
7228 	struct got_repository *repo = NULL;
7229 	struct got_worktree *worktree = NULL;
7230 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7231 	char *link_target = NULL;
7232 	struct got_object_id *commit_id = NULL;
7233 	struct got_commit_object *commit = NULL;
7234 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7235 	int ch;
7236 	struct tog_view *view = NULL;
7237 	int *pack_fds = NULL;
7238 
7239 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7240 		switch (ch) {
7241 		case 'c':
7242 			commit_id_str = optarg;
7243 			break;
7244 		case 'r':
7245 			repo_path = realpath(optarg, NULL);
7246 			if (repo_path == NULL)
7247 				return got_error_from_errno2("realpath",
7248 				    optarg);
7249 			break;
7250 		default:
7251 			usage_blame();
7252 			/* NOTREACHED */
7253 		}
7254 	}
7255 
7256 	argc -= optind;
7257 	argv += optind;
7258 
7259 	if (argc != 1)
7260 		usage_blame();
7261 
7262 	error = got_repo_pack_fds_open(&pack_fds);
7263 	if (error != NULL)
7264 		goto done;
7265 
7266 	if (repo_path == NULL) {
7267 		cwd = getcwd(NULL, 0);
7268 		if (cwd == NULL)
7269 			return got_error_from_errno("getcwd");
7270 		error = got_worktree_open(&worktree, cwd, NULL);
7271 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7272 			goto done;
7273 		if (worktree)
7274 			repo_path =
7275 			    strdup(got_worktree_get_repo_path(worktree));
7276 		else
7277 			repo_path = strdup(cwd);
7278 		if (repo_path == NULL) {
7279 			error = got_error_from_errno("strdup");
7280 			goto done;
7281 		}
7282 	}
7283 
7284 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7285 	if (error != NULL)
7286 		goto done;
7287 
7288 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7289 	    worktree);
7290 	if (error)
7291 		goto done;
7292 
7293 	init_curses();
7294 
7295 	error = apply_unveil(got_repo_get_path(repo), NULL);
7296 	if (error)
7297 		goto done;
7298 
7299 	error = tog_load_refs(repo, 0);
7300 	if (error)
7301 		goto done;
7302 
7303 	if (commit_id_str == NULL) {
7304 		struct got_reference *head_ref;
7305 		error = got_ref_open(&head_ref, repo, worktree ?
7306 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7307 		if (error != NULL)
7308 			goto done;
7309 		error = got_ref_resolve(&commit_id, repo, head_ref);
7310 		got_ref_close(head_ref);
7311 	} else {
7312 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7313 		    repo, worktree);
7314 		if (error != NULL)
7315 			goto done;
7316 		if (keyword_idstr != NULL)
7317 			commit_id_str = keyword_idstr;
7318 
7319 		error = got_repo_match_object_id(&commit_id, NULL,
7320 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7321 	}
7322 	if (error != NULL)
7323 		goto done;
7324 
7325 	error = got_object_open_as_commit(&commit, repo, commit_id);
7326 	if (error)
7327 		goto done;
7328 
7329 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7330 	    commit, repo);
7331 	if (error)
7332 		goto done;
7333 
7334 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7335 	if (view == NULL) {
7336 		error = got_error_from_errno("view_open");
7337 		goto done;
7338 	}
7339 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7340 	    commit_id, repo);
7341 	if (error != NULL) {
7342 		if (view->close == NULL)
7343 			close_blame_view(view);
7344 		view_close(view);
7345 		goto done;
7346 	}
7347 
7348 	if (worktree) {
7349 		error = set_tog_base_commit(repo, worktree);
7350 		if (error != NULL)
7351 			goto done;
7352 
7353 		/* Release work tree lock. */
7354 		got_worktree_close(worktree);
7355 		worktree = NULL;
7356 	}
7357 
7358 	error = view_loop(view);
7359 
7360 done:
7361 	free(tog_base_commit.id);
7362 	free(repo_path);
7363 	free(in_repo_path);
7364 	free(link_target);
7365 	free(cwd);
7366 	free(commit_id);
7367 	free(keyword_idstr);
7368 	if (commit)
7369 		got_object_commit_close(commit);
7370 	if (worktree)
7371 		got_worktree_close(worktree);
7372 	if (repo) {
7373 		const struct got_error *close_err = got_repo_close(repo);
7374 		if (error == NULL)
7375 			error = close_err;
7376 	}
7377 	if (pack_fds) {
7378 		const struct got_error *pack_err =
7379 		    got_repo_pack_fds_close(pack_fds);
7380 		if (error == NULL)
7381 			error = pack_err;
7382 	}
7383 	tog_free_refs();
7384 	return error;
7385 }
7386 
7387 static const struct got_error *
7388 draw_tree_entries(struct tog_view *view, const char *parent_path)
7389 {
7390 	struct tog_tree_view_state *s = &view->state.tree;
7391 	const struct got_error *err = NULL;
7392 	struct got_tree_entry *te;
7393 	wchar_t *wline;
7394 	char *index = NULL;
7395 	struct tog_color *tc;
7396 	int width, n, nentries, scrollx, i = 1;
7397 	int limit = view->nlines;
7398 
7399 	s->ndisplayed = 0;
7400 	if (view_is_hsplit_top(view))
7401 		--limit;  /* border */
7402 
7403 	werase(view->window);
7404 
7405 	if (limit == 0)
7406 		return NULL;
7407 
7408 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7409 	    0, 0);
7410 	if (err)
7411 		return err;
7412 	if (view_needs_focus_indication(view))
7413 		wstandout(view->window);
7414 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7415 	if (tc)
7416 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7417 	waddwstr(view->window, wline);
7418 	free(wline);
7419 	wline = NULL;
7420 	while (width++ < view->ncols)
7421 		waddch(view->window, ' ');
7422 	if (tc)
7423 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7424 	if (view_needs_focus_indication(view))
7425 		wstandend(view->window);
7426 	if (--limit <= 0)
7427 		return NULL;
7428 
7429 	i += s->selected;
7430 	if (s->first_displayed_entry) {
7431 		i += got_tree_entry_get_index(s->first_displayed_entry);
7432 		if (s->tree != s->root)
7433 			++i;  /* account for ".." entry */
7434 	}
7435 	nentries = got_object_tree_get_nentries(s->tree);
7436 	if (asprintf(&index, "[%d/%d] %s",
7437 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7438 		return got_error_from_errno("asprintf");
7439 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7440 	free(index);
7441 	if (err)
7442 		return err;
7443 	waddwstr(view->window, wline);
7444 	free(wline);
7445 	wline = NULL;
7446 	if (width < view->ncols - 1)
7447 		waddch(view->window, '\n');
7448 	if (--limit <= 0)
7449 		return NULL;
7450 	waddch(view->window, '\n');
7451 	if (--limit <= 0)
7452 		return NULL;
7453 
7454 	if (s->first_displayed_entry == NULL) {
7455 		te = got_object_tree_get_first_entry(s->tree);
7456 		if (s->selected == 0) {
7457 			if (view->focussed)
7458 				wstandout(view->window);
7459 			s->selected_entry = NULL;
7460 		}
7461 		waddstr(view->window, "  ..\n");	/* parent directory */
7462 		if (s->selected == 0 && view->focussed)
7463 			wstandend(view->window);
7464 		s->ndisplayed++;
7465 		if (--limit <= 0)
7466 			return NULL;
7467 		n = 1;
7468 	} else {
7469 		n = 0;
7470 		te = s->first_displayed_entry;
7471 	}
7472 
7473 	view->maxx = 0;
7474 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7475 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7476 		const char *modestr = "";
7477 		mode_t mode;
7478 
7479 		te = got_object_tree_get_entry(s->tree, i);
7480 		mode = got_tree_entry_get_mode(te);
7481 
7482 		if (s->show_ids) {
7483 			err = got_object_id_str(&id_str,
7484 			    got_tree_entry_get_id(te));
7485 			if (err)
7486 				return got_error_from_errno(
7487 				    "got_object_id_str");
7488 		}
7489 		if (got_object_tree_entry_is_submodule(te))
7490 			modestr = "$";
7491 		else if (S_ISLNK(mode)) {
7492 			int i;
7493 
7494 			err = got_tree_entry_get_symlink_target(&link_target,
7495 			    te, s->repo);
7496 			if (err) {
7497 				free(id_str);
7498 				return err;
7499 			}
7500 			for (i = 0; link_target[i] != '\0'; i++) {
7501 				if (!isprint((unsigned char)link_target[i]))
7502 					link_target[i] = '?';
7503 			}
7504 			modestr = "@";
7505 		}
7506 		else if (S_ISDIR(mode))
7507 			modestr = "/";
7508 		else if (mode & S_IXUSR)
7509 			modestr = "*";
7510 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7511 		    got_tree_entry_get_name(te), modestr,
7512 		    link_target ? " -> ": "",
7513 		    link_target ? link_target : "") == -1) {
7514 			free(id_str);
7515 			free(link_target);
7516 			return got_error_from_errno("asprintf");
7517 		}
7518 		free(id_str);
7519 		free(link_target);
7520 
7521 		/* use full line width to determine view->maxx */
7522 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7523 		if (err) {
7524 			free(line);
7525 			break;
7526 		}
7527 		view->maxx = MAX(view->maxx, width);
7528 		free(wline);
7529 		wline = NULL;
7530 
7531 		err = format_line(&wline, &width, &scrollx, line, view->x,
7532 		    view->ncols, 0, 0);
7533 		if (err) {
7534 			free(line);
7535 			break;
7536 		}
7537 		if (n == s->selected) {
7538 			if (view->focussed)
7539 				wstandout(view->window);
7540 			s->selected_entry = te;
7541 		}
7542 		tc = match_color(&s->colors, line);
7543 		if (tc)
7544 			wattr_on(view->window,
7545 			    COLOR_PAIR(tc->colorpair), NULL);
7546 		waddwstr(view->window, &wline[scrollx]);
7547 		if (tc)
7548 			wattr_off(view->window,
7549 			    COLOR_PAIR(tc->colorpair), NULL);
7550 		if (width < view->ncols)
7551 			waddch(view->window, '\n');
7552 		if (n == s->selected && view->focussed)
7553 			wstandend(view->window);
7554 		free(line);
7555 		free(wline);
7556 		wline = NULL;
7557 		n++;
7558 		s->ndisplayed++;
7559 		s->last_displayed_entry = te;
7560 		if (--limit <= 0)
7561 			break;
7562 	}
7563 
7564 	return err;
7565 }
7566 
7567 static void
7568 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7569 {
7570 	struct got_tree_entry *te;
7571 	int isroot = s->tree == s->root;
7572 	int i = 0;
7573 
7574 	if (s->first_displayed_entry == NULL)
7575 		return;
7576 
7577 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7578 	while (i++ < maxscroll) {
7579 		if (te == NULL) {
7580 			if (!isroot)
7581 				s->first_displayed_entry = NULL;
7582 			break;
7583 		}
7584 		s->first_displayed_entry = te;
7585 		te = got_tree_entry_get_prev(s->tree, te);
7586 	}
7587 }
7588 
7589 static const struct got_error *
7590 tree_scroll_down(struct tog_view *view, int maxscroll)
7591 {
7592 	struct tog_tree_view_state *s = &view->state.tree;
7593 	struct got_tree_entry *next, *last;
7594 	int n = 0;
7595 
7596 	if (s->first_displayed_entry)
7597 		next = got_tree_entry_get_next(s->tree,
7598 		    s->first_displayed_entry);
7599 	else
7600 		next = got_object_tree_get_first_entry(s->tree);
7601 
7602 	last = s->last_displayed_entry;
7603 	while (next && n++ < maxscroll) {
7604 		if (last) {
7605 			s->last_displayed_entry = last;
7606 			last = got_tree_entry_get_next(s->tree, last);
7607 		}
7608 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7609 			s->first_displayed_entry = next;
7610 			next = got_tree_entry_get_next(s->tree, next);
7611 		}
7612 	}
7613 
7614 	return NULL;
7615 }
7616 
7617 static const struct got_error *
7618 tree_entry_path(char **path, struct tog_parent_trees *parents,
7619     struct got_tree_entry *te)
7620 {
7621 	const struct got_error *err = NULL;
7622 	struct tog_parent_tree *pt;
7623 	size_t len = 2; /* for leading slash and NUL */
7624 
7625 	TAILQ_FOREACH(pt, parents, entry)
7626 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7627 		    + 1 /* slash */;
7628 	if (te)
7629 		len += strlen(got_tree_entry_get_name(te));
7630 
7631 	*path = calloc(1, len);
7632 	if (path == NULL)
7633 		return got_error_from_errno("calloc");
7634 
7635 	(*path)[0] = '/';
7636 	pt = TAILQ_LAST(parents, tog_parent_trees);
7637 	while (pt) {
7638 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7639 		if (strlcat(*path, name, len) >= len) {
7640 			err = got_error(GOT_ERR_NO_SPACE);
7641 			goto done;
7642 		}
7643 		if (strlcat(*path, "/", len) >= len) {
7644 			err = got_error(GOT_ERR_NO_SPACE);
7645 			goto done;
7646 		}
7647 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7648 	}
7649 	if (te) {
7650 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7651 			err = got_error(GOT_ERR_NO_SPACE);
7652 			goto done;
7653 		}
7654 	}
7655 done:
7656 	if (err) {
7657 		free(*path);
7658 		*path = NULL;
7659 	}
7660 	return err;
7661 }
7662 
7663 static const struct got_error *
7664 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7665     struct got_tree_entry *te, struct tog_parent_trees *parents,
7666     struct got_object_id *commit_id, struct got_repository *repo)
7667 {
7668 	const struct got_error *err = NULL;
7669 	char *path;
7670 	struct tog_view *blame_view;
7671 
7672 	*new_view = NULL;
7673 
7674 	err = tree_entry_path(&path, parents, te);
7675 	if (err)
7676 		return err;
7677 
7678 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7679 	if (blame_view == NULL) {
7680 		err = got_error_from_errno("view_open");
7681 		goto done;
7682 	}
7683 
7684 	err = open_blame_view(blame_view, path, commit_id, repo);
7685 	if (err) {
7686 		if (err->code == GOT_ERR_CANCELLED)
7687 			err = NULL;
7688 		view_close(blame_view);
7689 	} else
7690 		*new_view = blame_view;
7691 done:
7692 	free(path);
7693 	return err;
7694 }
7695 
7696 static const struct got_error *
7697 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7698     struct tog_tree_view_state *s)
7699 {
7700 	struct tog_view *log_view;
7701 	const struct got_error *err = NULL;
7702 	char *path;
7703 
7704 	*new_view = NULL;
7705 
7706 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7707 	if (log_view == NULL)
7708 		return got_error_from_errno("view_open");
7709 
7710 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7711 	if (err)
7712 		return err;
7713 
7714 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7715 	    path, 0, NULL);
7716 	if (err)
7717 		view_close(log_view);
7718 	else
7719 		*new_view = log_view;
7720 	free(path);
7721 	return err;
7722 }
7723 
7724 static const struct got_error *
7725 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7726     const char *head_ref_name, struct got_repository *repo)
7727 {
7728 	const struct got_error *err = NULL;
7729 	char *commit_id_str = NULL;
7730 	struct tog_tree_view_state *s = &view->state.tree;
7731 	struct got_commit_object *commit = NULL;
7732 
7733 	TAILQ_INIT(&s->parents);
7734 	STAILQ_INIT(&s->colors);
7735 
7736 	s->commit_id = got_object_id_dup(commit_id);
7737 	if (s->commit_id == NULL) {
7738 		err = got_error_from_errno("got_object_id_dup");
7739 		goto done;
7740 	}
7741 
7742 	err = got_object_open_as_commit(&commit, repo, commit_id);
7743 	if (err)
7744 		goto done;
7745 
7746 	/*
7747 	 * The root is opened here and will be closed when the view is closed.
7748 	 * Any visited subtrees and their path-wise parents are opened and
7749 	 * closed on demand.
7750 	 */
7751 	err = got_object_open_as_tree(&s->root, repo,
7752 	    got_object_commit_get_tree_id(commit));
7753 	if (err)
7754 		goto done;
7755 	s->tree = s->root;
7756 
7757 	err = got_object_id_str(&commit_id_str, commit_id);
7758 	if (err != NULL)
7759 		goto done;
7760 
7761 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7762 		err = got_error_from_errno("asprintf");
7763 		goto done;
7764 	}
7765 
7766 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7767 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7768 	if (head_ref_name) {
7769 		s->head_ref_name = strdup(head_ref_name);
7770 		if (s->head_ref_name == NULL) {
7771 			err = got_error_from_errno("strdup");
7772 			goto done;
7773 		}
7774 	}
7775 	s->repo = repo;
7776 
7777 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7778 		err = add_color(&s->colors, "\\$$",
7779 		    TOG_COLOR_TREE_SUBMODULE,
7780 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7781 		if (err)
7782 			goto done;
7783 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7784 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7785 		if (err)
7786 			goto done;
7787 		err = add_color(&s->colors, "/$",
7788 		    TOG_COLOR_TREE_DIRECTORY,
7789 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7790 		if (err)
7791 			goto done;
7792 
7793 		err = add_color(&s->colors, "\\*$",
7794 		    TOG_COLOR_TREE_EXECUTABLE,
7795 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7796 		if (err)
7797 			goto done;
7798 
7799 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7800 		    get_color_value("TOG_COLOR_COMMIT"));
7801 		if (err)
7802 			goto done;
7803 	}
7804 
7805 	view->show = show_tree_view;
7806 	view->input = input_tree_view;
7807 	view->close = close_tree_view;
7808 	view->search_start = search_start_tree_view;
7809 	view->search_next = search_next_tree_view;
7810 done:
7811 	free(commit_id_str);
7812 	if (commit)
7813 		got_object_commit_close(commit);
7814 	if (err) {
7815 		if (view->close == NULL)
7816 			close_tree_view(view);
7817 		view_close(view);
7818 	}
7819 	return err;
7820 }
7821 
7822 static const struct got_error *
7823 close_tree_view(struct tog_view *view)
7824 {
7825 	struct tog_tree_view_state *s = &view->state.tree;
7826 
7827 	free_colors(&s->colors);
7828 	free(s->tree_label);
7829 	s->tree_label = NULL;
7830 	free(s->commit_id);
7831 	s->commit_id = NULL;
7832 	free(s->head_ref_name);
7833 	s->head_ref_name = NULL;
7834 	while (!TAILQ_EMPTY(&s->parents)) {
7835 		struct tog_parent_tree *parent;
7836 		parent = TAILQ_FIRST(&s->parents);
7837 		TAILQ_REMOVE(&s->parents, parent, entry);
7838 		if (parent->tree != s->root)
7839 			got_object_tree_close(parent->tree);
7840 		free(parent);
7841 
7842 	}
7843 	if (s->tree != NULL && s->tree != s->root)
7844 		got_object_tree_close(s->tree);
7845 	if (s->root)
7846 		got_object_tree_close(s->root);
7847 	return NULL;
7848 }
7849 
7850 static const struct got_error *
7851 search_start_tree_view(struct tog_view *view)
7852 {
7853 	struct tog_tree_view_state *s = &view->state.tree;
7854 
7855 	s->matched_entry = NULL;
7856 	return NULL;
7857 }
7858 
7859 static int
7860 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7861 {
7862 	regmatch_t regmatch;
7863 
7864 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7865 	    0) == 0;
7866 }
7867 
7868 static const struct got_error *
7869 search_next_tree_view(struct tog_view *view)
7870 {
7871 	struct tog_tree_view_state *s = &view->state.tree;
7872 	struct got_tree_entry *te = NULL;
7873 
7874 	if (!view->searching) {
7875 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7876 		return NULL;
7877 	}
7878 
7879 	if (s->matched_entry) {
7880 		if (view->searching == TOG_SEARCH_FORWARD) {
7881 			if (s->selected_entry)
7882 				te = got_tree_entry_get_next(s->tree,
7883 				    s->selected_entry);
7884 			else
7885 				te = got_object_tree_get_first_entry(s->tree);
7886 		} else {
7887 			if (s->selected_entry == NULL)
7888 				te = got_object_tree_get_last_entry(s->tree);
7889 			else
7890 				te = got_tree_entry_get_prev(s->tree,
7891 				    s->selected_entry);
7892 		}
7893 	} else {
7894 		if (s->selected_entry)
7895 			te = s->selected_entry;
7896 		else if (view->searching == TOG_SEARCH_FORWARD)
7897 			te = got_object_tree_get_first_entry(s->tree);
7898 		else
7899 			te = got_object_tree_get_last_entry(s->tree);
7900 	}
7901 
7902 	while (1) {
7903 		if (te == NULL) {
7904 			if (s->matched_entry == NULL) {
7905 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7906 				return NULL;
7907 			}
7908 			if (view->searching == TOG_SEARCH_FORWARD)
7909 				te = got_object_tree_get_first_entry(s->tree);
7910 			else
7911 				te = got_object_tree_get_last_entry(s->tree);
7912 		}
7913 
7914 		if (match_tree_entry(te, &view->regex)) {
7915 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7916 			s->matched_entry = te;
7917 			break;
7918 		}
7919 
7920 		if (view->searching == TOG_SEARCH_FORWARD)
7921 			te = got_tree_entry_get_next(s->tree, te);
7922 		else
7923 			te = got_tree_entry_get_prev(s->tree, te);
7924 	}
7925 
7926 	if (s->matched_entry) {
7927 		s->first_displayed_entry = s->matched_entry;
7928 		s->selected = 0;
7929 	}
7930 
7931 	return NULL;
7932 }
7933 
7934 static const struct got_error *
7935 show_tree_view(struct tog_view *view)
7936 {
7937 	const struct got_error *err = NULL;
7938 	struct tog_tree_view_state *s = &view->state.tree;
7939 	char *parent_path;
7940 
7941 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7942 	if (err)
7943 		return err;
7944 
7945 	err = draw_tree_entries(view, parent_path);
7946 	free(parent_path);
7947 
7948 	view_border(view);
7949 	return err;
7950 }
7951 
7952 static const struct got_error *
7953 tree_goto_line(struct tog_view *view, int nlines)
7954 {
7955 	const struct got_error		 *err = NULL;
7956 	struct tog_tree_view_state	 *s = &view->state.tree;
7957 	struct got_tree_entry		**fte, **lte, **ste;
7958 	int				  g, last, first = 1, i = 1;
7959 	int				  root = s->tree == s->root;
7960 	int				  off = root ? 1 : 2;
7961 
7962 	g = view->gline;
7963 	view->gline = 0;
7964 
7965 	if (g == 0)
7966 		g = 1;
7967 	else if (g > got_object_tree_get_nentries(s->tree))
7968 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7969 
7970 	fte = &s->first_displayed_entry;
7971 	lte = &s->last_displayed_entry;
7972 	ste = &s->selected_entry;
7973 
7974 	if (*fte != NULL) {
7975 		first = got_tree_entry_get_index(*fte);
7976 		first += off;  /* account for ".." */
7977 	}
7978 	last = got_tree_entry_get_index(*lte);
7979 	last += off;
7980 
7981 	if (g >= first && g <= last && g - first < nlines) {
7982 		s->selected = g - first;
7983 		return NULL;	/* gline is on the current page */
7984 	}
7985 
7986 	if (*ste != NULL) {
7987 		i = got_tree_entry_get_index(*ste);
7988 		i += off;
7989 	}
7990 
7991 	if (i < g) {
7992 		err = tree_scroll_down(view, g - i);
7993 		if (err)
7994 			return err;
7995 		if (got_tree_entry_get_index(*lte) >=
7996 		    got_object_tree_get_nentries(s->tree) - 1 &&
7997 		    first + s->selected < g &&
7998 		    s->selected < s->ndisplayed - 1) {
7999 			first = got_tree_entry_get_index(*fte);
8000 			first += off;
8001 			s->selected = g - first;
8002 		}
8003 	} else if (i > g)
8004 		tree_scroll_up(s, i - g);
8005 
8006 	if (g < nlines &&
8007 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
8008 		s->selected = g - 1;
8009 
8010 	return NULL;
8011 }
8012 
8013 static const struct got_error *
8014 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
8015 {
8016 	const struct got_error *err = NULL;
8017 	struct tog_tree_view_state *s = &view->state.tree;
8018 	struct got_tree_entry *te;
8019 	int n, nscroll = view->nlines - 3;
8020 
8021 	if (view->gline)
8022 		return tree_goto_line(view, nscroll);
8023 
8024 	switch (ch) {
8025 	case '0':
8026 	case '$':
8027 	case KEY_RIGHT:
8028 	case 'l':
8029 	case KEY_LEFT:
8030 	case 'h':
8031 		horizontal_scroll_input(view, ch);
8032 		break;
8033 	case 'i':
8034 		s->show_ids = !s->show_ids;
8035 		view->count = 0;
8036 		break;
8037 	case 'L':
8038 		view->count = 0;
8039 		if (!s->selected_entry)
8040 			break;
8041 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8042 		break;
8043 	case 'R':
8044 		view->count = 0;
8045 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8046 		break;
8047 	case 'g':
8048 	case '=':
8049 	case KEY_HOME:
8050 		s->selected = 0;
8051 		view->count = 0;
8052 		if (s->tree == s->root)
8053 			s->first_displayed_entry =
8054 			    got_object_tree_get_first_entry(s->tree);
8055 		else
8056 			s->first_displayed_entry = NULL;
8057 		break;
8058 	case 'G':
8059 	case '*':
8060 	case KEY_END: {
8061 		int eos = view->nlines - 3;
8062 
8063 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8064 			--eos;  /* border */
8065 		s->selected = 0;
8066 		view->count = 0;
8067 		te = got_object_tree_get_last_entry(s->tree);
8068 		for (n = 0; n < eos; n++) {
8069 			if (te == NULL) {
8070 				if (s->tree != s->root) {
8071 					s->first_displayed_entry = NULL;
8072 					n++;
8073 				}
8074 				break;
8075 			}
8076 			s->first_displayed_entry = te;
8077 			te = got_tree_entry_get_prev(s->tree, te);
8078 		}
8079 		if (n > 0)
8080 			s->selected = n - 1;