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