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 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2308 		wline[wlen - 1] = L'\0';
2309 		wlen--;
2310 	}
2311 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2312 		wline[wlen - 1] = L'\0';
2313 		wlen--;
2314 	}
2315 
2316 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
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 + 2 + 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 (view_is_hsplit_top(view) && s->first_displayed_entry &&
4017 	    s->last_displayed_entry) {
4018 		s->selected = MIN(s->selected,
4019 		    s->last_displayed_entry->idx -
4020 		    s->first_displayed_entry->idx);
4021 	}
4022 
4023 	select_commit(s);
4024 
4025 	if (s->thread_args.log_complete &&
4026 	    s->selected_entry->idx == s->commits->ncommits - 1)
4027 		view->count = 0;
4028 
4029 	return NULL;
4030 }
4031 
4032 static void
4033 view_get_split(struct tog_view *view, int *y, int *x)
4034 {
4035 	*x = 0;
4036 	*y = 0;
4037 
4038 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4039 		if (view->child && view->child->resized_y)
4040 			*y = view->child->resized_y;
4041 		else if (view->resized_y)
4042 			*y = view->resized_y;
4043 		else
4044 			*y = view_split_begin_y(view->lines);
4045 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4046 		if (view->child && view->child->resized_x)
4047 			*x = view->child->resized_x;
4048 		else if (view->resized_x)
4049 			*x = view->resized_x;
4050 		else
4051 			*x = view_split_begin_x(view->begin_x);
4052 	}
4053 }
4054 
4055 /* Split view horizontally at y and offset view->state->selected line. */
4056 static const struct got_error *
4057 view_init_hsplit(struct tog_view *view, int y)
4058 {
4059 	const struct got_error *err = NULL;
4060 
4061 	view->nlines = y;
4062 	view->ncols = COLS;
4063 	err = view_resize(view);
4064 	if (err)
4065 		return err;
4066 
4067 	err = offset_selection_down(view);
4068 
4069 	return err;
4070 }
4071 
4072 static const struct got_error *
4073 log_goto_line(struct tog_view *view, int nlines)
4074 {
4075 	const struct got_error		*err = NULL;
4076 	struct tog_log_view_state	*s = &view->state.log;
4077 	int				 g, idx = s->selected_entry->idx;
4078 
4079 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4080 		return NULL;
4081 
4082 	g = view->gline;
4083 	view->gline = 0;
4084 
4085 	if (g >= s->first_displayed_entry->idx + 1 &&
4086 	    g <= s->last_displayed_entry->idx + 1 &&
4087 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4088 		s->selected = g - s->first_displayed_entry->idx - 1;
4089 		select_commit(s);
4090 		return NULL;
4091 	}
4092 
4093 	if (idx + 1 < g) {
4094 		err = log_move_cursor_down(view, g - idx - 1);
4095 		if (!err && g > s->selected_entry->idx + 1)
4096 			err = log_move_cursor_down(view,
4097 			    g - s->first_displayed_entry->idx - 1);
4098 		if (err)
4099 			return err;
4100 	} else if (idx + 1 > g)
4101 		log_move_cursor_up(view, idx - g + 1, 0);
4102 
4103 	if (g < nlines && s->first_displayed_entry->idx == 0)
4104 		s->selected = g - 1;
4105 
4106 	select_commit(s);
4107 	return NULL;
4108 
4109 }
4110 
4111 static void
4112 horizontal_scroll_input(struct tog_view *view, int ch)
4113 {
4114 
4115 	switch (ch) {
4116 	case KEY_LEFT:
4117 	case 'h':
4118 		view->x -= MIN(view->x, 2);
4119 		if (view->x <= 0)
4120 			view->count = 0;
4121 		break;
4122 	case KEY_RIGHT:
4123 	case 'l':
4124 		if (view->x + view->ncols / 2 < view->maxx)
4125 			view->x += 2;
4126 		else
4127 			view->count = 0;
4128 		break;
4129 	case '0':
4130 		view->x = 0;
4131 		break;
4132 	case '$':
4133 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4134 		view->count = 0;
4135 		break;
4136 	default:
4137 		break;
4138 	}
4139 }
4140 
4141 static const struct got_error *
4142 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4143 {
4144 	const struct got_error *err = NULL;
4145 	struct tog_log_view_state *s = &view->state.log;
4146 	int eos, nscroll;
4147 
4148 	if (s->thread_args.load_all) {
4149 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4150 			s->thread_args.load_all = 0;
4151 		else if (s->thread_args.log_complete) {
4152 			err = log_move_cursor_down(view, s->commits->ncommits);
4153 			s->thread_args.load_all = 0;
4154 		}
4155 		if (err)
4156 			return err;
4157 	}
4158 
4159 	eos = nscroll = view->nlines - 1;
4160 	if (view_is_hsplit_top(view))
4161 		--eos;  /* border */
4162 
4163 	if (view->gline)
4164 		return log_goto_line(view, eos);
4165 
4166 	switch (ch) {
4167 	case '&':
4168 		err = limit_log_view(view);
4169 		break;
4170 	case 'q':
4171 		s->quit = 1;
4172 		break;
4173 	case '0':
4174 	case '$':
4175 	case KEY_RIGHT:
4176 	case 'l':
4177 	case KEY_LEFT:
4178 	case 'h':
4179 		horizontal_scroll_input(view, ch);
4180 		break;
4181 	case 'k':
4182 	case KEY_UP:
4183 	case '<':
4184 	case ',':
4185 	case CTRL('p'):
4186 		log_move_cursor_up(view, 0, 0);
4187 		break;
4188 	case 'g':
4189 	case '=':
4190 	case KEY_HOME:
4191 		log_move_cursor_up(view, 0, 1);
4192 		view->count = 0;
4193 		break;
4194 	case CTRL('u'):
4195 	case 'u':
4196 		nscroll /= 2;
4197 		/* FALL THROUGH */
4198 	case KEY_PPAGE:
4199 	case CTRL('b'):
4200 	case 'b':
4201 		log_move_cursor_up(view, nscroll, 0);
4202 		break;
4203 	case 'j':
4204 	case KEY_DOWN:
4205 	case '>':
4206 	case '.':
4207 	case CTRL('n'):
4208 		err = log_move_cursor_down(view, 0);
4209 		break;
4210 	case '@':
4211 		s->use_committer = !s->use_committer;
4212 		view->action = s->use_committer ?
4213 		    "show committer" : "show commit author";
4214 		break;
4215 	case 'G':
4216 	case '*':
4217 	case KEY_END: {
4218 		/* We don't know yet how many commits, so we're forced to
4219 		 * traverse them all. */
4220 		view->count = 0;
4221 		s->thread_args.load_all = 1;
4222 		if (!s->thread_args.log_complete)
4223 			return trigger_log_thread(view, 0);
4224 		err = log_move_cursor_down(view, s->commits->ncommits);
4225 		s->thread_args.load_all = 0;
4226 		break;
4227 	}
4228 	case CTRL('d'):
4229 	case 'd':
4230 		nscroll /= 2;
4231 		/* FALL THROUGH */
4232 	case KEY_NPAGE:
4233 	case CTRL('f'):
4234 	case 'f':
4235 	case ' ':
4236 		err = log_move_cursor_down(view, nscroll);
4237 		break;
4238 	case KEY_RESIZE:
4239 		if (s->selected > view->nlines - 2)
4240 			s->selected = view->nlines - 2;
4241 		if (s->selected > s->commits->ncommits - 1)
4242 			s->selected = s->commits->ncommits - 1;
4243 		select_commit(s);
4244 		if (s->commits->ncommits < view->nlines - 1 &&
4245 		    !s->thread_args.log_complete) {
4246 			s->thread_args.commits_needed += (view->nlines - 1) -
4247 			    s->commits->ncommits;
4248 			err = trigger_log_thread(view, 1);
4249 		}
4250 		break;
4251 	case KEY_ENTER:
4252 	case '\r':
4253 		view->count = 0;
4254 		if (s->selected_entry == NULL)
4255 			break;
4256 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4257 		break;
4258 	case 'T':
4259 		view->count = 0;
4260 		if (s->selected_entry == NULL)
4261 			break;
4262 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4263 		break;
4264 	case KEY_BACKSPACE:
4265 	case CTRL('l'):
4266 	case 'B':
4267 		view->count = 0;
4268 		if (ch == KEY_BACKSPACE &&
4269 		    got_path_is_root_dir(s->in_repo_path))
4270 			break;
4271 		err = stop_log_thread(s);
4272 		if (err)
4273 			return err;
4274 		if (ch == KEY_BACKSPACE) {
4275 			char *parent_path;
4276 			err = got_path_dirname(&parent_path, s->in_repo_path);
4277 			if (err)
4278 				return err;
4279 			free(s->in_repo_path);
4280 			s->in_repo_path = parent_path;
4281 			s->thread_args.in_repo_path = s->in_repo_path;
4282 		} else if (ch == CTRL('l')) {
4283 			struct got_object_id *start_id;
4284 			err = got_repo_match_object_id(&start_id, NULL,
4285 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4286 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4287 			if (err) {
4288 				if (s->head_ref_name == NULL ||
4289 				    err->code != GOT_ERR_NOT_REF)
4290 					return err;
4291 				/* Try to cope with deleted references. */
4292 				free(s->head_ref_name);
4293 				s->head_ref_name = NULL;
4294 				err = got_repo_match_object_id(&start_id,
4295 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4296 				    &tog_refs, s->repo);
4297 				if (err)
4298 					return err;
4299 			}
4300 			free(s->start_id);
4301 			s->start_id = start_id;
4302 			s->thread_args.start_id = s->start_id;
4303 		} else /* 'B' */
4304 			s->log_branches = !s->log_branches;
4305 
4306 		if (s->thread_args.pack_fds == NULL) {
4307 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4308 			if (err)
4309 				return err;
4310 		}
4311 		err = got_repo_open(&s->thread_args.repo,
4312 		    got_repo_get_path(s->repo), NULL,
4313 		    s->thread_args.pack_fds);
4314 		if (err)
4315 			return err;
4316 		tog_free_refs();
4317 		err = tog_load_refs(s->repo, 0);
4318 		if (err)
4319 			return err;
4320 		err = got_commit_graph_open(&s->thread_args.graph,
4321 		    s->in_repo_path, !s->log_branches);
4322 		if (err)
4323 			return err;
4324 		err = got_commit_graph_bfsort(s->thread_args.graph,
4325 		    s->start_id, s->repo, NULL, NULL);
4326 		if (err)
4327 			return err;
4328 		free_commits(&s->real_commits);
4329 		free_commits(&s->limit_commits);
4330 		s->first_displayed_entry = NULL;
4331 		s->last_displayed_entry = NULL;
4332 		s->selected_entry = NULL;
4333 		s->selected = 0;
4334 		s->thread_args.log_complete = 0;
4335 		s->quit = 0;
4336 		s->thread_args.commits_needed = view->lines;
4337 		s->matched_entry = NULL;
4338 		s->search_entry = NULL;
4339 		view->offset = 0;
4340 		break;
4341 	case 'R':
4342 		view->count = 0;
4343 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4344 		break;
4345 	default:
4346 		view->count = 0;
4347 		break;
4348 	}
4349 
4350 	return err;
4351 }
4352 
4353 static const struct got_error *
4354 apply_unveil(const char *repo_path, const char *worktree_path)
4355 {
4356 	const struct got_error *error;
4357 
4358 #ifdef PROFILE
4359 	if (unveil("gmon.out", "rwc") != 0)
4360 		return got_error_from_errno2("unveil", "gmon.out");
4361 #endif
4362 	if (repo_path && unveil(repo_path, "r") != 0)
4363 		return got_error_from_errno2("unveil", repo_path);
4364 
4365 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4366 		return got_error_from_errno2("unveil", worktree_path);
4367 
4368 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4369 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4370 
4371 	error = got_privsep_unveil_exec_helpers();
4372 	if (error != NULL)
4373 		return error;
4374 
4375 	if (unveil(NULL, NULL) != 0)
4376 		return got_error_from_errno("unveil");
4377 
4378 	return NULL;
4379 }
4380 
4381 static const struct got_error *
4382 init_mock_term(const char *test_script_path)
4383 {
4384 	const struct got_error	*err = NULL;
4385 	const char *screen_dump_path;
4386 	int in;
4387 
4388 	if (test_script_path == NULL || *test_script_path == '\0')
4389 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4390 
4391 	tog_io.f = fopen(test_script_path, "re");
4392 	if (tog_io.f == NULL) {
4393 		err = got_error_from_errno_fmt("fopen: %s",
4394 		    test_script_path);
4395 		goto done;
4396 	}
4397 
4398 	/* test mode, we don't want any output */
4399 	tog_io.cout = fopen("/dev/null", "w+");
4400 	if (tog_io.cout == NULL) {
4401 		err = got_error_from_errno2("fopen", "/dev/null");
4402 		goto done;
4403 	}
4404 
4405 	in = dup(fileno(tog_io.cout));
4406 	if (in == -1) {
4407 		err = got_error_from_errno("dup");
4408 		goto done;
4409 	}
4410 	tog_io.cin = fdopen(in, "r");
4411 	if (tog_io.cin == NULL) {
4412 		err = got_error_from_errno("fdopen");
4413 		close(in);
4414 		goto done;
4415 	}
4416 
4417 	screen_dump_path = getenv("TOG_SCR_DUMP");
4418 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4419 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4420 	tog_io.sdump = fopen(screen_dump_path, "we");
4421 	if (tog_io.sdump == NULL) {
4422 		err = got_error_from_errno2("fopen", screen_dump_path);
4423 		goto done;
4424 	}
4425 
4426 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4427 		err = got_error_from_errno("fseeko");
4428 		goto done;
4429 	}
4430 
4431 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4432 		err = got_error_msg(GOT_ERR_IO,
4433 		    "newterm: failed to initialise curses");
4434 
4435 	using_mock_io = 1;
4436 
4437 done:
4438 	if (err)
4439 		tog_io_close();
4440 	return err;
4441 }
4442 
4443 static void
4444 init_curses(void)
4445 {
4446 	if (using_mock_io) /* In test mode we use a fake terminal */
4447 		return;
4448 
4449 	initscr();
4450 
4451 	cbreak();
4452 	halfdelay(1); /* Fast refresh while initial view is loading. */
4453 	noecho();
4454 	nonl();
4455 	intrflush(stdscr, FALSE);
4456 	keypad(stdscr, TRUE);
4457 	curs_set(0);
4458 	if (getenv("TOG_COLORS") != NULL) {
4459 		start_color();
4460 		use_default_colors();
4461 	}
4462 
4463 	return;
4464 }
4465 
4466 static const struct got_error *
4467 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4468 {
4469 	tog_base_commit.id = got_object_id_dup(
4470 	    got_worktree_get_base_commit_id(worktree));
4471 	if (tog_base_commit.id == NULL)
4472 		return got_error_from_errno( "got_object_id_dup");
4473 
4474 	return NULL;
4475 }
4476 
4477 static const struct got_error *
4478 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4479     struct got_repository *repo, struct got_worktree *worktree)
4480 {
4481 	const struct got_error *err = NULL;
4482 
4483 	if (argc == 0) {
4484 		*in_repo_path = strdup("/");
4485 		if (*in_repo_path == NULL)
4486 			return got_error_from_errno("strdup");
4487 		return NULL;
4488 	}
4489 
4490 	if (worktree) {
4491 		const char *prefix = got_worktree_get_path_prefix(worktree);
4492 		char *p;
4493 
4494 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4495 		if (err)
4496 			return err;
4497 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4498 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4499 		    p) == -1) {
4500 			err = got_error_from_errno("asprintf");
4501 			*in_repo_path = NULL;
4502 		}
4503 		free(p);
4504 	} else
4505 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4506 
4507 	return err;
4508 }
4509 
4510 static const struct got_error *
4511 cmd_log(int argc, char *argv[])
4512 {
4513 	const struct got_error *error;
4514 	struct got_repository *repo = NULL;
4515 	struct got_worktree *worktree = NULL;
4516 	struct got_object_id *start_id = NULL;
4517 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4518 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4519 	struct got_reference *ref = NULL;
4520 	const char *head_ref_name = NULL;
4521 	int ch, log_branches = 0;
4522 	struct tog_view *view;
4523 	int *pack_fds = NULL;
4524 
4525 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4526 		switch (ch) {
4527 		case 'b':
4528 			log_branches = 1;
4529 			break;
4530 		case 'c':
4531 			start_commit = optarg;
4532 			break;
4533 		case 'r':
4534 			repo_path = realpath(optarg, NULL);
4535 			if (repo_path == NULL)
4536 				return got_error_from_errno2("realpath",
4537 				    optarg);
4538 			break;
4539 		default:
4540 			usage_log();
4541 			/* NOTREACHED */
4542 		}
4543 	}
4544 
4545 	argc -= optind;
4546 	argv += optind;
4547 
4548 	if (argc > 1)
4549 		usage_log();
4550 
4551 	error = got_repo_pack_fds_open(&pack_fds);
4552 	if (error != NULL)
4553 		goto done;
4554 
4555 	if (repo_path == NULL) {
4556 		cwd = getcwd(NULL, 0);
4557 		if (cwd == NULL) {
4558 			error = got_error_from_errno("getcwd");
4559 			goto done;
4560 		}
4561 		error = got_worktree_open(&worktree, cwd, NULL);
4562 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4563 			goto done;
4564 		if (worktree)
4565 			repo_path =
4566 			    strdup(got_worktree_get_repo_path(worktree));
4567 		else
4568 			repo_path = strdup(cwd);
4569 		if (repo_path == NULL) {
4570 			error = got_error_from_errno("strdup");
4571 			goto done;
4572 		}
4573 	}
4574 
4575 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4576 	if (error != NULL)
4577 		goto done;
4578 
4579 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4580 	    repo, worktree);
4581 	if (error)
4582 		goto done;
4583 
4584 	init_curses();
4585 
4586 	error = apply_unveil(got_repo_get_path(repo),
4587 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4588 	if (error)
4589 		goto done;
4590 
4591 	/* already loaded by tog_log_with_path()? */
4592 	if (TAILQ_EMPTY(&tog_refs)) {
4593 		error = tog_load_refs(repo, 0);
4594 		if (error)
4595 			goto done;
4596 	}
4597 
4598 	if (start_commit == NULL) {
4599 		error = got_repo_match_object_id(&start_id, &label,
4600 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4601 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4602 		if (error)
4603 			goto done;
4604 		head_ref_name = label;
4605 	} else {
4606 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4607 		    repo, worktree);
4608 		if (error != NULL)
4609 			goto done;
4610 		if (keyword_idstr != NULL)
4611 			start_commit = keyword_idstr;
4612 
4613 		error = got_ref_open(&ref, repo, start_commit, 0);
4614 		if (error == NULL)
4615 			head_ref_name = got_ref_get_name(ref);
4616 		else if (error->code != GOT_ERR_NOT_REF)
4617 			goto done;
4618 		error = got_repo_match_object_id(&start_id, NULL,
4619 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4620 		if (error)
4621 			goto done;
4622 	}
4623 
4624 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4625 	if (view == NULL) {
4626 		error = got_error_from_errno("view_open");
4627 		goto done;
4628 	}
4629 
4630 	if (worktree) {
4631 		error = set_tog_base_commit(repo, worktree);
4632 		if (error != NULL)
4633 			goto done;
4634 	}
4635 
4636 	error = open_log_view(view, start_id, repo, head_ref_name,
4637 	    in_repo_path, log_branches, worktree);
4638 	if (error)
4639 		goto done;
4640 
4641 	if (worktree) {
4642 		/* The work tree will be closed by the log thread. */
4643 		worktree = NULL;
4644 	}
4645 
4646 	error = view_loop(view);
4647 
4648 done:
4649 	free(tog_base_commit.id);
4650 	free(keyword_idstr);
4651 	free(in_repo_path);
4652 	free(repo_path);
4653 	free(cwd);
4654 	free(start_id);
4655 	free(label);
4656 	if (ref)
4657 		got_ref_close(ref);
4658 	if (repo) {
4659 		const struct got_error *close_err = got_repo_close(repo);
4660 		if (error == NULL)
4661 			error = close_err;
4662 	}
4663 	if (worktree)
4664 		got_worktree_close(worktree);
4665 	if (pack_fds) {
4666 		const struct got_error *pack_err =
4667 		    got_repo_pack_fds_close(pack_fds);
4668 		if (error == NULL)
4669 			error = pack_err;
4670 	}
4671 	tog_free_refs();
4672 	return error;
4673 }
4674 
4675 __dead static void
4676 usage_diff(void)
4677 {
4678 	endwin();
4679 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4680 	    "object1 object2\n", getprogname());
4681 	exit(1);
4682 }
4683 
4684 static int
4685 match_line(const char *line, regex_t *regex, size_t nmatch,
4686     regmatch_t *regmatch)
4687 {
4688 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4689 }
4690 
4691 static struct tog_color *
4692 match_color(struct tog_colors *colors, const char *line)
4693 {
4694 	struct tog_color *tc = NULL;
4695 
4696 	STAILQ_FOREACH(tc, colors, entry) {
4697 		if (match_line(line, &tc->regex, 0, NULL))
4698 			return tc;
4699 	}
4700 
4701 	return NULL;
4702 }
4703 
4704 static const struct got_error *
4705 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4706     WINDOW *window, int skipcol, regmatch_t *regmatch)
4707 {
4708 	const struct got_error *err = NULL;
4709 	char *exstr = NULL;
4710 	wchar_t *wline = NULL;
4711 	int rme, rms, n, width, scrollx;
4712 	int width0 = 0, width1 = 0, width2 = 0;
4713 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4714 
4715 	*wtotal = 0;
4716 
4717 	rms = regmatch->rm_so;
4718 	rme = regmatch->rm_eo;
4719 
4720 	err = expand_tab(&exstr, line);
4721 	if (err)
4722 		return err;
4723 
4724 	/* Split the line into 3 segments, according to match offsets. */
4725 	seg0 = strndup(exstr, rms);
4726 	if (seg0 == NULL) {
4727 		err = got_error_from_errno("strndup");
4728 		goto done;
4729 	}
4730 	seg1 = strndup(exstr + rms, rme - rms);
4731 	if (seg1 == NULL) {
4732 		err = got_error_from_errno("strndup");
4733 		goto done;
4734 	}
4735 	seg2 = strdup(exstr + rme);
4736 	if (seg2 == NULL) {
4737 		err = got_error_from_errno("strndup");
4738 		goto done;
4739 	}
4740 
4741 	/* draw up to matched token if we haven't scrolled past it */
4742 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4743 	    col_tab_align, 1);
4744 	if (err)
4745 		goto done;
4746 	n = MAX(width0 - skipcol, 0);
4747 	if (n) {
4748 		free(wline);
4749 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4750 		    wlimit, col_tab_align, 1);
4751 		if (err)
4752 			goto done;
4753 		waddwstr(window, &wline[scrollx]);
4754 		wlimit -= width;
4755 		*wtotal += width;
4756 	}
4757 
4758 	if (wlimit > 0) {
4759 		int i = 0, w = 0;
4760 		size_t wlen;
4761 
4762 		free(wline);
4763 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4764 		    col_tab_align, 1);
4765 		if (err)
4766 			goto done;
4767 		wlen = wcslen(wline);
4768 		while (i < wlen) {
4769 			width = wcwidth(wline[i]);
4770 			if (width == -1) {
4771 				/* should not happen, tabs are expanded */
4772 				err = got_error(GOT_ERR_RANGE);
4773 				goto done;
4774 			}
4775 			if (width0 + w + width > skipcol)
4776 				break;
4777 			w += width;
4778 			i++;
4779 		}
4780 		/* draw (visible part of) matched token (if scrolled into it) */
4781 		if (width1 - w > 0) {
4782 			wattron(window, A_STANDOUT);
4783 			waddwstr(window, &wline[i]);
4784 			wattroff(window, A_STANDOUT);
4785 			wlimit -= (width1 - w);
4786 			*wtotal += (width1 - w);
4787 		}
4788 	}
4789 
4790 	if (wlimit > 0) {  /* draw rest of line */
4791 		free(wline);
4792 		if (skipcol > width0 + width1) {
4793 			err = format_line(&wline, &width2, &scrollx, seg2,
4794 			    skipcol - (width0 + width1), wlimit,
4795 			    col_tab_align, 1);
4796 			if (err)
4797 				goto done;
4798 			waddwstr(window, &wline[scrollx]);
4799 		} else {
4800 			err = format_line(&wline, &width2, NULL, seg2, 0,
4801 			    wlimit, col_tab_align, 1);
4802 			if (err)
4803 				goto done;
4804 			waddwstr(window, wline);
4805 		}
4806 		*wtotal += width2;
4807 	}
4808 done:
4809 	free(wline);
4810 	free(exstr);
4811 	free(seg0);
4812 	free(seg1);
4813 	free(seg2);
4814 	return err;
4815 }
4816 
4817 static int
4818 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4819 {
4820 	FILE	*f = NULL;
4821 	int	*eof, *first, *selected;
4822 
4823 	if (view->type == TOG_VIEW_DIFF) {
4824 		struct tog_diff_view_state *s = &view->state.diff;
4825 
4826 		first = &s->first_displayed_line;
4827 		selected = first;
4828 		eof = &s->eof;
4829 		f = s->f;
4830 	} else if (view->type == TOG_VIEW_HELP) {
4831 		struct tog_help_view_state *s = &view->state.help;
4832 
4833 		first = &s->first_displayed_line;
4834 		selected = first;
4835 		eof = &s->eof;
4836 		f = s->f;
4837 	} else if (view->type == TOG_VIEW_BLAME) {
4838 		struct tog_blame_view_state *s = &view->state.blame;
4839 
4840 		first = &s->first_displayed_line;
4841 		selected = &s->selected_line;
4842 		eof = &s->eof;
4843 		f = s->blame.f;
4844 	} else
4845 		return 0;
4846 
4847 	/* Center gline in the middle of the page like vi(1). */
4848 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4849 		return 0;
4850 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4851 		rewind(f);
4852 		*eof = 0;
4853 		*first = 1;
4854 		*lineno = 0;
4855 		*nprinted = 0;
4856 		return 0;
4857 	}
4858 
4859 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4860 		view->gline : (view->nlines - 3) / 2 + 1;
4861 	view->gline = 0;
4862 
4863 	return 1;
4864 }
4865 
4866 static const struct got_error *
4867 draw_file(struct tog_view *view, const char *header)
4868 {
4869 	struct tog_diff_view_state *s = &view->state.diff;
4870 	regmatch_t *regmatch = &view->regmatch;
4871 	const struct got_error *err;
4872 	int nprinted = 0;
4873 	char *line;
4874 	size_t linesize = 0;
4875 	ssize_t linelen;
4876 	wchar_t *wline;
4877 	int width;
4878 	int max_lines = view->nlines;
4879 	int nlines = s->nlines;
4880 	off_t line_offset;
4881 
4882 	s->lineno = s->first_displayed_line - 1;
4883 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4884 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4885 		return got_error_from_errno("fseek");
4886 
4887 	werase(view->window);
4888 
4889 	if (view->gline > s->nlines - 1)
4890 		view->gline = s->nlines - 1;
4891 
4892 	if (header) {
4893 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4894 		    1 : view->gline - (view->nlines - 3) / 2 :
4895 		    s->lineno + s->selected_line;
4896 
4897 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4898 			return got_error_from_errno("asprintf");
4899 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4900 		    0, 0);
4901 		free(line);
4902 		if (err)
4903 			return err;
4904 
4905 		if (view_needs_focus_indication(view))
4906 			wstandout(view->window);
4907 		waddwstr(view->window, wline);
4908 		free(wline);
4909 		wline = NULL;
4910 		while (width++ < view->ncols)
4911 			waddch(view->window, ' ');
4912 		if (view_needs_focus_indication(view))
4913 			wstandend(view->window);
4914 
4915 		if (max_lines <= 1)
4916 			return NULL;
4917 		max_lines--;
4918 	}
4919 
4920 	s->eof = 0;
4921 	view->maxx = 0;
4922 	line = NULL;
4923 	while (max_lines > 0 && nprinted < max_lines) {
4924 		enum got_diff_line_type linetype;
4925 		attr_t attr = 0;
4926 
4927 		linelen = getline(&line, &linesize, s->f);
4928 		if (linelen == -1) {
4929 			if (feof(s->f)) {
4930 				s->eof = 1;
4931 				break;
4932 			}
4933 			free(line);
4934 			return got_ferror(s->f, GOT_ERR_IO);
4935 		}
4936 
4937 		if (++s->lineno < s->first_displayed_line)
4938 			continue;
4939 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4940 			continue;
4941 		if (s->lineno == view->hiline)
4942 			attr = A_STANDOUT;
4943 
4944 		/* Set view->maxx based on full line length. */
4945 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4946 		    view->x ? 1 : 0);
4947 		if (err) {
4948 			free(line);
4949 			return err;
4950 		}
4951 		view->maxx = MAX(view->maxx, width);
4952 		free(wline);
4953 		wline = NULL;
4954 
4955 		linetype = s->lines[s->lineno].type;
4956 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4957 		    linetype < GOT_DIFF_LINE_CONTEXT)
4958 			attr |= COLOR_PAIR(linetype);
4959 		if (attr)
4960 			wattron(view->window, attr);
4961 		if (s->first_displayed_line + nprinted == s->matched_line &&
4962 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4963 			err = add_matched_line(&width, line, view->ncols, 0,
4964 			    view->window, view->x, regmatch);
4965 			if (err) {
4966 				free(line);
4967 				return err;
4968 			}
4969 		} else {
4970 			int skip;
4971 			err = format_line(&wline, &width, &skip, line,
4972 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4973 			if (err) {
4974 				free(line);
4975 				return err;
4976 			}
4977 			waddwstr(view->window, &wline[skip]);
4978 			free(wline);
4979 			wline = NULL;
4980 		}
4981 		if (s->lineno == view->hiline) {
4982 			/* highlight full gline length */
4983 			while (width++ < view->ncols)
4984 				waddch(view->window, ' ');
4985 		} else {
4986 			if (width <= view->ncols - 1)
4987 				waddch(view->window, '\n');
4988 		}
4989 		if (attr)
4990 			wattroff(view->window, attr);
4991 		if (++nprinted == 1)
4992 			s->first_displayed_line = s->lineno;
4993 	}
4994 	free(line);
4995 	if (nprinted >= 1)
4996 		s->last_displayed_line = s->first_displayed_line +
4997 		    (nprinted - 1);
4998 	else
4999 		s->last_displayed_line = s->first_displayed_line;
5000 
5001 	view_border(view);
5002 
5003 	if (s->eof) {
5004 		while (nprinted < view->nlines) {
5005 			waddch(view->window, '\n');
5006 			nprinted++;
5007 		}
5008 
5009 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
5010 		    view->ncols, 0, 0);
5011 		if (err) {
5012 			return err;
5013 		}
5014 
5015 		wstandout(view->window);
5016 		waddwstr(view->window, wline);
5017 		free(wline);
5018 		wline = NULL;
5019 		wstandend(view->window);
5020 	}
5021 
5022 	return NULL;
5023 }
5024 
5025 static char *
5026 get_datestr(time_t *time, char *datebuf)
5027 {
5028 	struct tm mytm, *tm;
5029 	char *p, *s;
5030 
5031 	tm = gmtime_r(time, &mytm);
5032 	if (tm == NULL)
5033 		return NULL;
5034 	s = asctime_r(tm, datebuf);
5035 	if (s == NULL)
5036 		return NULL;
5037 	p = strchr(s, '\n');
5038 	if (p)
5039 		*p = '\0';
5040 	return s;
5041 }
5042 
5043 static const struct got_error *
5044 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5045     off_t off, uint8_t type)
5046 {
5047 	struct got_diff_line *p;
5048 
5049 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5050 	if (p == NULL)
5051 		return got_error_from_errno("reallocarray");
5052 	*lines = p;
5053 	(*lines)[*nlines].offset = off;
5054 	(*lines)[*nlines].type = type;
5055 	(*nlines)++;
5056 
5057 	return NULL;
5058 }
5059 
5060 static const struct got_error *
5061 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5062     struct got_diff_line *s_lines, size_t s_nlines)
5063 {
5064 	struct got_diff_line	*p;
5065 	char			 buf[BUFSIZ];
5066 	size_t			 i, r;
5067 
5068 	if (fseeko(src, 0L, SEEK_SET) == -1)
5069 		return got_error_from_errno("fseeko");
5070 
5071 	for (;;) {
5072 		r = fread(buf, 1, sizeof(buf), src);
5073 		if (r == 0) {
5074 			if (ferror(src))
5075 				return got_error_from_errno("fread");
5076 			if (feof(src))
5077 				break;
5078 		}
5079 		if (fwrite(buf, 1, r, dst) != r)
5080 			return got_ferror(dst, GOT_ERR_IO);
5081 	}
5082 
5083 	if (s_nlines == 0 && *d_nlines == 0)
5084 		return NULL;
5085 
5086 	/*
5087 	 * If commit info was in dst, increment line offsets
5088 	 * of the appended diff content, but skip s_lines[0]
5089 	 * because offset zero is already in *d_lines.
5090 	 */
5091 	if (*d_nlines > 0) {
5092 		for (i = 1; i < s_nlines; ++i)
5093 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5094 
5095 		if (s_nlines > 0) {
5096 			--s_nlines;
5097 			++s_lines;
5098 		}
5099 	}
5100 
5101 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5102 	if (p == NULL) {
5103 		/* d_lines is freed in close_diff_view() */
5104 		return got_error_from_errno("reallocarray");
5105 	}
5106 
5107 	*d_lines = p;
5108 
5109 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5110 	*d_nlines += s_nlines;
5111 
5112 	return NULL;
5113 }
5114 
5115 static const struct got_error *
5116 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5117     struct got_object_id *commit_id, struct got_reflist_head *refs,
5118     struct got_repository *repo, int ignore_ws, int force_text_diff,
5119     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5120 {
5121 	const struct got_error *err = NULL;
5122 	char datebuf[26], *datestr;
5123 	struct got_commit_object *commit;
5124 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5125 	time_t committer_time;
5126 	const char *author, *committer;
5127 	char *refs_str = NULL;
5128 	struct got_pathlist_entry *pe;
5129 	off_t outoff = 0;
5130 	int n;
5131 
5132 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5133 	if (err)
5134 		return err;
5135 
5136 	err = got_object_open_as_commit(&commit, repo, commit_id);
5137 	if (err)
5138 		return err;
5139 
5140 	err = got_object_id_str(&id_str, commit_id);
5141 	if (err) {
5142 		err = got_error_from_errno("got_object_id_str");
5143 		goto done;
5144 	}
5145 
5146 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5147 	if (err)
5148 		goto done;
5149 
5150 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5151 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5152 	if (n < 0) {
5153 		err = got_error_from_errno("fprintf");
5154 		goto done;
5155 	}
5156 	outoff += n;
5157 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5158 	if (err)
5159 		goto done;
5160 
5161 	n = fprintf(outfile, "from: %s\n",
5162 	    got_object_commit_get_author(commit));
5163 	if (n < 0) {
5164 		err = got_error_from_errno("fprintf");
5165 		goto done;
5166 	}
5167 	outoff += n;
5168 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5169 	if (err)
5170 		goto done;
5171 
5172 	author = got_object_commit_get_author(commit);
5173 	committer = got_object_commit_get_committer(commit);
5174 	if (strcmp(author, committer) != 0) {
5175 		n = fprintf(outfile, "via: %s\n", committer);
5176 		if (n < 0) {
5177 			err = got_error_from_errno("fprintf");
5178 			goto done;
5179 		}
5180 		outoff += n;
5181 		err = add_line_metadata(lines, nlines, outoff,
5182 		    GOT_DIFF_LINE_AUTHOR);
5183 		if (err)
5184 			goto done;
5185 	}
5186 	committer_time = got_object_commit_get_committer_time(commit);
5187 	datestr = get_datestr(&committer_time, datebuf);
5188 	if (datestr) {
5189 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5190 		if (n < 0) {
5191 			err = got_error_from_errno("fprintf");
5192 			goto done;
5193 		}
5194 		outoff += n;
5195 		err = add_line_metadata(lines, nlines, outoff,
5196 		    GOT_DIFF_LINE_DATE);
5197 		if (err)
5198 			goto done;
5199 	}
5200 	if (got_object_commit_get_nparents(commit) > 1) {
5201 		const struct got_object_id_queue *parent_ids;
5202 		struct got_object_qid *qid;
5203 		int pn = 1;
5204 		parent_ids = got_object_commit_get_parent_ids(commit);
5205 		STAILQ_FOREACH(qid, parent_ids, entry) {
5206 			err = got_object_id_str(&id_str, &qid->id);
5207 			if (err)
5208 				goto done;
5209 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5210 			if (n < 0) {
5211 				err = got_error_from_errno("fprintf");
5212 				goto done;
5213 			}
5214 			outoff += n;
5215 			err = add_line_metadata(lines, nlines, outoff,
5216 			    GOT_DIFF_LINE_META);
5217 			if (err)
5218 				goto done;
5219 			free(id_str);
5220 			id_str = NULL;
5221 		}
5222 	}
5223 
5224 	err = got_object_commit_get_logmsg(&logmsg, commit);
5225 	if (err)
5226 		goto done;
5227 	s = logmsg;
5228 	while ((line = strsep(&s, "\n")) != NULL) {
5229 		n = fprintf(outfile, "%s\n", line);
5230 		if (n < 0) {
5231 			err = got_error_from_errno("fprintf");
5232 			goto done;
5233 		}
5234 		outoff += n;
5235 		err = add_line_metadata(lines, nlines, outoff,
5236 		    GOT_DIFF_LINE_LOGMSG);
5237 		if (err)
5238 			goto done;
5239 	}
5240 
5241 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5242 		struct got_diff_changed_path *cp = pe->data;
5243 		int pad = dsa->max_path_len - pe->path_len + 1;
5244 
5245 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5246 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5247 		    dsa->rm_cols + 1, cp->rm);
5248 		if (n < 0) {
5249 			err = got_error_from_errno("fprintf");
5250 			goto done;
5251 		}
5252 		outoff += n;
5253 		err = add_line_metadata(lines, nlines, outoff,
5254 		    GOT_DIFF_LINE_CHANGES);
5255 		if (err)
5256 			goto done;
5257 	}
5258 
5259 	fputc('\n', outfile);
5260 	outoff++;
5261 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5262 	if (err)
5263 		goto done;
5264 
5265 	n = fprintf(outfile,
5266 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5267 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5268 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5269 	if (n < 0) {
5270 		err = got_error_from_errno("fprintf");
5271 		goto done;
5272 	}
5273 	outoff += n;
5274 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5275 	if (err)
5276 		goto done;
5277 
5278 	fputc('\n', outfile);
5279 	outoff++;
5280 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5281 done:
5282 	free(id_str);
5283 	free(logmsg);
5284 	free(refs_str);
5285 	got_object_commit_close(commit);
5286 	if (err) {
5287 		free(*lines);
5288 		*lines = NULL;
5289 		*nlines = 0;
5290 	}
5291 	return err;
5292 }
5293 
5294 static const struct got_error *
5295 create_diff(struct tog_diff_view_state *s)
5296 {
5297 	const struct got_error *err = NULL;
5298 	FILE *tmp_diff_file = NULL;
5299 	int obj_type;
5300 	struct got_diff_line *lines = NULL;
5301 	struct got_pathlist_head changed_paths;
5302 	struct got_commit_object *commit2 = NULL;
5303 
5304 	TAILQ_INIT(&changed_paths);
5305 
5306 	free(s->lines);
5307 	s->lines = malloc(sizeof(*s->lines));
5308 	if (s->lines == NULL)
5309 		return got_error_from_errno("malloc");
5310 	s->nlines = 0;
5311 
5312 	if (s->f && fclose(s->f) == EOF) {
5313 		s->f = NULL;
5314 		return got_error_from_errno("fclose");
5315 	}
5316 
5317 	s->f = got_opentemp();
5318 	if (s->f == NULL)
5319 		return got_error_from_errno("got_opentemp");
5320 
5321 	tmp_diff_file = got_opentemp();
5322 	if (tmp_diff_file == NULL)
5323 		return got_error_from_errno("got_opentemp");
5324 
5325 	if (s->id1)
5326 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5327 	else
5328 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5329 	if (err)
5330 		goto done;
5331 
5332 	switch (obj_type) {
5333 	case GOT_OBJ_TYPE_BLOB:
5334 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5335 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5336 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5337 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5338 		    s->f);
5339 		break;
5340 	case GOT_OBJ_TYPE_TREE:
5341 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5342 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5343 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5344 		    s->force_text_diff, NULL, s->repo, s->f);
5345 		break;
5346 	case GOT_OBJ_TYPE_COMMIT: {
5347 		const struct got_object_id_queue *parent_ids;
5348 		struct got_object_qid *pid;
5349 		struct got_reflist_head *refs;
5350 		size_t nlines = 0;
5351 		struct got_diffstat_cb_arg dsa = {
5352 			0, 0, 0, 0, 0, 0,
5353 			&changed_paths,
5354 			s->ignore_whitespace,
5355 			s->force_text_diff,
5356 			tog_diff_algo
5357 		};
5358 
5359 		lines = malloc(sizeof(*lines));
5360 		if (lines == NULL) {
5361 			err = got_error_from_errno("malloc");
5362 			goto done;
5363 		}
5364 
5365 		/* build diff first in tmp file then append to commit info */
5366 		err = got_diff_objects_as_commits(&lines, &nlines,
5367 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5368 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5369 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5370 		if (err)
5371 			break;
5372 
5373 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5374 		/* Show commit info if we're diffing to a parent/root commit. */
5375 		if (s->id1 == NULL) {
5376 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5377 			    refs, s->repo, s->ignore_whitespace,
5378 			    s->force_text_diff, &dsa, s->f);
5379 			if (err)
5380 				goto done;
5381 		} else {
5382 			err = got_object_open_as_commit(&commit2, s->repo,
5383 			    s->id2);
5384 			if (err)
5385 				goto done;
5386 
5387 			parent_ids = got_object_commit_get_parent_ids(commit2);
5388 			STAILQ_FOREACH(pid, parent_ids, entry) {
5389 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5390 					err = write_commit_info(&s->lines,
5391 					    &s->nlines, s->id2, refs, s->repo,
5392 					    s->ignore_whitespace,
5393 					    s->force_text_diff, &dsa, s->f);
5394 					if (err)
5395 						goto done;
5396 					break;
5397 				}
5398 			}
5399 		}
5400 
5401 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5402 		    lines, nlines);
5403 		break;
5404 	}
5405 	default:
5406 		err = got_error(GOT_ERR_OBJ_TYPE);
5407 		break;
5408 	}
5409 done:
5410 	free(lines);
5411 	if (commit2 != NULL)
5412 		got_object_commit_close(commit2);
5413 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5414 	if (s->f && fflush(s->f) != 0 && err == NULL)
5415 		err = got_error_from_errno("fflush");
5416 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5417 		err = got_error_from_errno("fclose");
5418 	return err;
5419 }
5420 
5421 static void
5422 diff_view_indicate_progress(struct tog_view *view)
5423 {
5424 	mvwaddstr(view->window, 0, 0, "diffing...");
5425 	update_panels();
5426 	doupdate();
5427 }
5428 
5429 static const struct got_error *
5430 search_start_diff_view(struct tog_view *view)
5431 {
5432 	struct tog_diff_view_state *s = &view->state.diff;
5433 
5434 	s->matched_line = 0;
5435 	return NULL;
5436 }
5437 
5438 static void
5439 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5440     size_t *nlines, int **first, int **last, int **match, int **selected)
5441 {
5442 	struct tog_diff_view_state *s = &view->state.diff;
5443 
5444 	*f = s->f;
5445 	*nlines = s->nlines;
5446 	*line_offsets = NULL;
5447 	*match = &s->matched_line;
5448 	*first = &s->first_displayed_line;
5449 	*last = &s->last_displayed_line;
5450 	*selected = &s->selected_line;
5451 }
5452 
5453 static const struct got_error *
5454 search_next_view_match(struct tog_view *view)
5455 {
5456 	const struct got_error *err = NULL;
5457 	FILE *f;
5458 	int lineno;
5459 	char *line = NULL;
5460 	size_t linesize = 0;
5461 	ssize_t linelen;
5462 	off_t *line_offsets;
5463 	size_t nlines = 0;
5464 	int *first, *last, *match, *selected;
5465 
5466 	if (!view->search_setup)
5467 		return got_error_msg(GOT_ERR_NOT_IMPL,
5468 		    "view search not supported");
5469 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5470 	    &match, &selected);
5471 
5472 	if (!view->searching) {
5473 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5474 		return NULL;
5475 	}
5476 
5477 	if (*match) {
5478 		if (view->searching == TOG_SEARCH_FORWARD)
5479 			lineno = *first + 1;
5480 		else
5481 			lineno = *first - 1;
5482 	} else
5483 		lineno = *first - 1 + *selected;
5484 
5485 	while (1) {
5486 		off_t offset;
5487 
5488 		if (lineno <= 0 || lineno > nlines) {
5489 			if (*match == 0) {
5490 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5491 				break;
5492 			}
5493 
5494 			if (view->searching == TOG_SEARCH_FORWARD)
5495 				lineno = 1;
5496 			else
5497 				lineno = nlines;
5498 		}
5499 
5500 		offset = view->type == TOG_VIEW_DIFF ?
5501 		    view->state.diff.lines[lineno - 1].offset :
5502 		    line_offsets[lineno - 1];
5503 		if (fseeko(f, offset, SEEK_SET) != 0) {
5504 			free(line);
5505 			return got_error_from_errno("fseeko");
5506 		}
5507 		linelen = getline(&line, &linesize, f);
5508 		if (linelen != -1) {
5509 			char *exstr;
5510 			err = expand_tab(&exstr, line);
5511 			if (err)
5512 				break;
5513 			if (match_line(exstr, &view->regex, 1,
5514 			    &view->regmatch)) {
5515 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5516 				*match = lineno;
5517 				free(exstr);
5518 				break;
5519 			}
5520 			free(exstr);
5521 		}
5522 		if (view->searching == TOG_SEARCH_FORWARD)
5523 			lineno++;
5524 		else
5525 			lineno--;
5526 	}
5527 	free(line);
5528 
5529 	if (*match) {
5530 		*first = *match;
5531 		*selected = 1;
5532 	}
5533 
5534 	return err;
5535 }
5536 
5537 static const struct got_error *
5538 close_diff_view(struct tog_view *view)
5539 {
5540 	const struct got_error *err = NULL;
5541 	struct tog_diff_view_state *s = &view->state.diff;
5542 
5543 	free(s->id1);
5544 	s->id1 = NULL;
5545 	free(s->id2);
5546 	s->id2 = NULL;
5547 	if (s->f && fclose(s->f) == EOF)
5548 		err = got_error_from_errno("fclose");
5549 	s->f = NULL;
5550 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5551 		err = got_error_from_errno("fclose");
5552 	s->f1 = NULL;
5553 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5554 		err = got_error_from_errno("fclose");
5555 	s->f2 = NULL;
5556 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5557 		err = got_error_from_errno("close");
5558 	s->fd1 = -1;
5559 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5560 		err = got_error_from_errno("close");
5561 	s->fd2 = -1;
5562 	free(s->lines);
5563 	s->lines = NULL;
5564 	s->nlines = 0;
5565 	return err;
5566 }
5567 
5568 static const struct got_error *
5569 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5570     struct got_object_id *id2, const char *label1, const char *label2,
5571     int diff_context, int ignore_whitespace, int force_text_diff,
5572     struct tog_view *parent_view, struct got_repository *repo)
5573 {
5574 	const struct got_error *err;
5575 	struct tog_diff_view_state *s = &view->state.diff;
5576 
5577 	memset(s, 0, sizeof(*s));
5578 	s->fd1 = -1;
5579 	s->fd2 = -1;
5580 
5581 	if (id1 != NULL && id2 != NULL) {
5582 		int type1, type2;
5583 
5584 		err = got_object_get_type(&type1, repo, id1);
5585 		if (err)
5586 			goto done;
5587 		err = got_object_get_type(&type2, repo, id2);
5588 		if (err)
5589 			goto done;
5590 
5591 		if (type1 != type2) {
5592 			err = got_error(GOT_ERR_OBJ_TYPE);
5593 			goto done;
5594 		}
5595 	}
5596 	s->first_displayed_line = 1;
5597 	s->last_displayed_line = view->nlines;
5598 	s->selected_line = 1;
5599 	s->repo = repo;
5600 	s->label1 = label1;
5601 	s->label2 = label2;
5602 
5603 	if (id1) {
5604 		s->id1 = got_object_id_dup(id1);
5605 		if (s->id1 == NULL) {
5606 			err = got_error_from_errno("got_object_id_dup");
5607 			goto done;
5608 		}
5609 	} else
5610 		s->id1 = NULL;
5611 
5612 	s->id2 = got_object_id_dup(id2);
5613 	if (s->id2 == NULL) {
5614 		err = got_error_from_errno("got_object_id_dup");
5615 		goto done;
5616 	}
5617 
5618 	s->f1 = got_opentemp();
5619 	if (s->f1 == NULL) {
5620 		err = got_error_from_errno("got_opentemp");
5621 		goto done;
5622 	}
5623 
5624 	s->f2 = got_opentemp();
5625 	if (s->f2 == NULL) {
5626 		err = got_error_from_errno("got_opentemp");
5627 		goto done;
5628 	}
5629 
5630 	s->fd1 = got_opentempfd();
5631 	if (s->fd1 == -1) {
5632 		err = got_error_from_errno("got_opentempfd");
5633 		goto done;
5634 	}
5635 
5636 	s->fd2 = got_opentempfd();
5637 	if (s->fd2 == -1) {
5638 		err = got_error_from_errno("got_opentempfd");
5639 		goto done;
5640 	}
5641 
5642 	s->diff_context = diff_context;
5643 	s->ignore_whitespace = ignore_whitespace;
5644 	s->force_text_diff = force_text_diff;
5645 	s->parent_view = parent_view;
5646 	s->repo = repo;
5647 
5648 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5649 		int rc;
5650 
5651 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5652 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5653 		if (rc != ERR)
5654 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5655 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5656 		if (rc != ERR)
5657 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5658 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5659 		if (rc != ERR)
5660 			rc = init_pair(GOT_DIFF_LINE_META,
5661 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5662 		if (rc != ERR)
5663 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5664 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5665 		if (rc != ERR)
5666 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5667 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5668 		if (rc != ERR)
5669 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5670 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5671 		if (rc != ERR)
5672 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5673 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5674 		if (rc != ERR)
5675 			rc = init_pair(GOT_DIFF_LINE_DATE,
5676 			    get_color_value("TOG_COLOR_DATE"), -1);
5677 		if (rc == ERR) {
5678 			err = got_error(GOT_ERR_RANGE);
5679 			goto done;
5680 		}
5681 	}
5682 
5683 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5684 	    view_is_splitscreen(view))
5685 		show_log_view(parent_view); /* draw border */
5686 	diff_view_indicate_progress(view);
5687 
5688 	err = create_diff(s);
5689 
5690 	view->show = show_diff_view;
5691 	view->input = input_diff_view;
5692 	view->reset = reset_diff_view;
5693 	view->close = close_diff_view;
5694 	view->search_start = search_start_diff_view;
5695 	view->search_setup = search_setup_diff_view;
5696 	view->search_next = search_next_view_match;
5697 done:
5698 	if (err) {
5699 		if (view->close == NULL)
5700 			close_diff_view(view);
5701 		view_close(view);
5702 	}
5703 	return err;
5704 }
5705 
5706 static const struct got_error *
5707 show_diff_view(struct tog_view *view)
5708 {
5709 	const struct got_error *err;
5710 	struct tog_diff_view_state *s = &view->state.diff;
5711 	char *id_str1 = NULL, *id_str2, *header;
5712 	const char *label1, *label2;
5713 
5714 	if (s->id1) {
5715 		err = got_object_id_str(&id_str1, s->id1);
5716 		if (err)
5717 			return err;
5718 		label1 = s->label1 ? s->label1 : id_str1;
5719 	} else
5720 		label1 = "/dev/null";
5721 
5722 	err = got_object_id_str(&id_str2, s->id2);
5723 	if (err)
5724 		return err;
5725 	label2 = s->label2 ? s->label2 : id_str2;
5726 
5727 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5728 		err = got_error_from_errno("asprintf");
5729 		free(id_str1);
5730 		free(id_str2);
5731 		return err;
5732 	}
5733 	free(id_str1);
5734 	free(id_str2);
5735 
5736 	err = draw_file(view, header);
5737 	free(header);
5738 	return err;
5739 }
5740 
5741 static const struct got_error *
5742 set_selected_commit(struct tog_diff_view_state *s,
5743     struct commit_queue_entry *entry)
5744 {
5745 	const struct got_error *err;
5746 	const struct got_object_id_queue *parent_ids;
5747 	struct got_commit_object *selected_commit;
5748 	struct got_object_qid *pid;
5749 
5750 	free(s->id2);
5751 	s->id2 = got_object_id_dup(entry->id);
5752 	if (s->id2 == NULL)
5753 		return got_error_from_errno("got_object_id_dup");
5754 
5755 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5756 	if (err)
5757 		return err;
5758 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5759 	free(s->id1);
5760 	pid = STAILQ_FIRST(parent_ids);
5761 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5762 	got_object_commit_close(selected_commit);
5763 	return NULL;
5764 }
5765 
5766 static const struct got_error *
5767 reset_diff_view(struct tog_view *view)
5768 {
5769 	struct tog_diff_view_state *s = &view->state.diff;
5770 
5771 	view->count = 0;
5772 	wclear(view->window);
5773 	s->first_displayed_line = 1;
5774 	s->last_displayed_line = view->nlines;
5775 	s->matched_line = 0;
5776 	diff_view_indicate_progress(view);
5777 	return create_diff(s);
5778 }
5779 
5780 static void
5781 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5782 {
5783 	int start, i;
5784 
5785 	i = start = s->first_displayed_line - 1;
5786 
5787 	while (s->lines[i].type != type) {
5788 		if (i == 0)
5789 			i = s->nlines - 1;
5790 		if (--i == start)
5791 			return; /* do nothing, requested type not in file */
5792 	}
5793 
5794 	s->selected_line = 1;
5795 	s->first_displayed_line = i;
5796 }
5797 
5798 static void
5799 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5800 {
5801 	int start, i;
5802 
5803 	i = start = s->first_displayed_line + 1;
5804 
5805 	while (s->lines[i].type != type) {
5806 		if (i == s->nlines - 1)
5807 			i = 0;
5808 		if (++i == start)
5809 			return; /* do nothing, requested type not in file */
5810 	}
5811 
5812 	s->selected_line = 1;
5813 	s->first_displayed_line = i;
5814 }
5815 
5816 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5817     int, int, int);
5818 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5819     int, int);
5820 
5821 static const struct got_error *
5822 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5823 {
5824 	const struct got_error *err = NULL;
5825 	struct tog_diff_view_state *s = &view->state.diff;
5826 	struct tog_log_view_state *ls;
5827 	struct commit_queue_entry *old_selected_entry;
5828 	char *line = NULL;
5829 	size_t linesize = 0;
5830 	ssize_t linelen;
5831 	int i, nscroll = view->nlines - 1, up = 0;
5832 
5833 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5834 
5835 	switch (ch) {
5836 	case '0':
5837 	case '$':
5838 	case KEY_RIGHT:
5839 	case 'l':
5840 	case KEY_LEFT:
5841 	case 'h':
5842 		horizontal_scroll_input(view, ch);
5843 		break;
5844 	case 'a':
5845 	case 'w':
5846 		if (ch == 'a') {
5847 			s->force_text_diff = !s->force_text_diff;
5848 			view->action = s->force_text_diff ?
5849 			    "force ASCII text enabled" :
5850 			    "force ASCII text disabled";
5851 		}
5852 		else if (ch == 'w') {
5853 			s->ignore_whitespace = !s->ignore_whitespace;
5854 			view->action = s->ignore_whitespace ?
5855 			    "ignore whitespace enabled" :
5856 			    "ignore whitespace disabled";
5857 		}
5858 		err = reset_diff_view(view);
5859 		break;
5860 	case 'g':
5861 	case KEY_HOME:
5862 		s->first_displayed_line = 1;
5863 		view->count = 0;
5864 		break;
5865 	case 'G':
5866 	case KEY_END:
5867 		view->count = 0;
5868 		if (s->eof)
5869 			break;
5870 
5871 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5872 		s->eof = 1;
5873 		break;
5874 	case 'k':
5875 	case KEY_UP:
5876 	case CTRL('p'):
5877 		if (s->first_displayed_line > 1)
5878 			s->first_displayed_line--;
5879 		else
5880 			view->count = 0;
5881 		break;
5882 	case CTRL('u'):
5883 	case 'u':
5884 		nscroll /= 2;
5885 		/* FALL THROUGH */
5886 	case KEY_PPAGE:
5887 	case CTRL('b'):
5888 	case 'b':
5889 		if (s->first_displayed_line == 1) {
5890 			view->count = 0;
5891 			break;
5892 		}
5893 		i = 0;
5894 		while (i++ < nscroll && s->first_displayed_line > 1)
5895 			s->first_displayed_line--;
5896 		break;
5897 	case 'j':
5898 	case KEY_DOWN:
5899 	case CTRL('n'):
5900 		if (!s->eof)
5901 			s->first_displayed_line++;
5902 		else
5903 			view->count = 0;
5904 		break;
5905 	case CTRL('d'):
5906 	case 'd':
5907 		nscroll /= 2;
5908 		/* FALL THROUGH */
5909 	case KEY_NPAGE:
5910 	case CTRL('f'):
5911 	case 'f':
5912 	case ' ':
5913 		if (s->eof) {
5914 			view->count = 0;
5915 			break;
5916 		}
5917 		i = 0;
5918 		while (!s->eof && i++ < nscroll) {
5919 			linelen = getline(&line, &linesize, s->f);
5920 			s->first_displayed_line++;
5921 			if (linelen == -1) {
5922 				if (feof(s->f)) {
5923 					s->eof = 1;
5924 				} else
5925 					err = got_ferror(s->f, GOT_ERR_IO);
5926 				break;
5927 			}
5928 		}
5929 		free(line);
5930 		break;
5931 	case '(':
5932 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5933 		break;
5934 	case ')':
5935 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5936 		break;
5937 	case '{':
5938 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5939 		break;
5940 	case '}':
5941 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5942 		break;
5943 	case '[':
5944 		if (s->diff_context > 0) {
5945 			s->diff_context--;
5946 			s->matched_line = 0;
5947 			diff_view_indicate_progress(view);
5948 			err = create_diff(s);
5949 			if (s->first_displayed_line + view->nlines - 1 >
5950 			    s->nlines) {
5951 				s->first_displayed_line = 1;
5952 				s->last_displayed_line = view->nlines;
5953 			}
5954 		} else
5955 			view->count = 0;
5956 		break;
5957 	case ']':
5958 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5959 			s->diff_context++;
5960 			s->matched_line = 0;
5961 			diff_view_indicate_progress(view);
5962 			err = create_diff(s);
5963 		} else
5964 			view->count = 0;
5965 		break;
5966 	case '<':
5967 	case ',':
5968 	case 'K':
5969 		up = 1;
5970 		/* FALL THROUGH */
5971 	case '>':
5972 	case '.':
5973 	case 'J':
5974 		if (s->parent_view == NULL) {
5975 			view->count = 0;
5976 			break;
5977 		}
5978 		s->parent_view->count = view->count;
5979 
5980 		if (s->parent_view->type == TOG_VIEW_LOG) {
5981 			ls = &s->parent_view->state.log;
5982 			old_selected_entry = ls->selected_entry;
5983 
5984 			err = input_log_view(NULL, s->parent_view,
5985 			    up ? KEY_UP : KEY_DOWN);
5986 			if (err)
5987 				break;
5988 			view->count = s->parent_view->count;
5989 
5990 			if (old_selected_entry == ls->selected_entry)
5991 				break;
5992 
5993 			err = set_selected_commit(s, ls->selected_entry);
5994 			if (err)
5995 				break;
5996 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5997 			struct tog_blame_view_state *bs;
5998 			struct got_object_id *id, *prev_id;
5999 
6000 			bs = &s->parent_view->state.blame;
6001 			prev_id = get_annotation_for_line(bs->blame.lines,
6002 			    bs->blame.nlines, bs->last_diffed_line);
6003 
6004 			err = input_blame_view(&view, s->parent_view,
6005 			    up ? KEY_UP : KEY_DOWN);
6006 			if (err)
6007 				break;
6008 			view->count = s->parent_view->count;
6009 
6010 			if (prev_id == NULL)
6011 				break;
6012 			id = get_selected_commit_id(bs->blame.lines,
6013 			    bs->blame.nlines, bs->first_displayed_line,
6014 			    bs->selected_line);
6015 			if (id == NULL)
6016 				break;
6017 
6018 			if (!got_object_id_cmp(prev_id, id))
6019 				break;
6020 
6021 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6022 			if (err)
6023 				break;
6024 		}
6025 		s->first_displayed_line = 1;
6026 		s->last_displayed_line = view->nlines;
6027 		s->matched_line = 0;
6028 		view->x = 0;
6029 
6030 		diff_view_indicate_progress(view);
6031 		err = create_diff(s);
6032 		break;
6033 	default:
6034 		view->count = 0;
6035 		break;
6036 	}
6037 
6038 	return err;
6039 }
6040 
6041 static const struct got_error *
6042 cmd_diff(int argc, char *argv[])
6043 {
6044 	const struct got_error *error;
6045 	struct got_repository *repo = NULL;
6046 	struct got_worktree *worktree = NULL;
6047 	struct got_object_id *id1 = NULL, *id2 = NULL;
6048 	char *repo_path = NULL, *cwd = NULL;
6049 	char *id_str1 = NULL, *id_str2 = NULL;
6050 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6051 	char *label1 = NULL, *label2 = NULL;
6052 	int diff_context = 3, ignore_whitespace = 0;
6053 	int ch, force_text_diff = 0;
6054 	const char *errstr;
6055 	struct tog_view *view;
6056 	int *pack_fds = NULL;
6057 
6058 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6059 		switch (ch) {
6060 		case 'a':
6061 			force_text_diff = 1;
6062 			break;
6063 		case 'C':
6064 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6065 			    &errstr);
6066 			if (errstr != NULL)
6067 				errx(1, "number of context lines is %s: %s",
6068 				    errstr, errstr);
6069 			break;
6070 		case 'r':
6071 			repo_path = realpath(optarg, NULL);
6072 			if (repo_path == NULL)
6073 				return got_error_from_errno2("realpath",
6074 				    optarg);
6075 			got_path_strip_trailing_slashes(repo_path);
6076 			break;
6077 		case 'w':
6078 			ignore_whitespace = 1;
6079 			break;
6080 		default:
6081 			usage_diff();
6082 			/* NOTREACHED */
6083 		}
6084 	}
6085 
6086 	argc -= optind;
6087 	argv += optind;
6088 
6089 	if (argc == 0) {
6090 		usage_diff(); /* TODO show local worktree changes */
6091 	} else if (argc == 2) {
6092 		id_str1 = argv[0];
6093 		id_str2 = argv[1];
6094 	} else
6095 		usage_diff();
6096 
6097 	error = got_repo_pack_fds_open(&pack_fds);
6098 	if (error)
6099 		goto done;
6100 
6101 	if (repo_path == NULL) {
6102 		cwd = getcwd(NULL, 0);
6103 		if (cwd == NULL)
6104 			return got_error_from_errno("getcwd");
6105 		error = got_worktree_open(&worktree, cwd, NULL);
6106 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6107 			goto done;
6108 		if (worktree)
6109 			repo_path =
6110 			    strdup(got_worktree_get_repo_path(worktree));
6111 		else
6112 			repo_path = strdup(cwd);
6113 		if (repo_path == NULL) {
6114 			error = got_error_from_errno("strdup");
6115 			goto done;
6116 		}
6117 	}
6118 
6119 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6120 	if (error)
6121 		goto done;
6122 
6123 	init_curses();
6124 
6125 	error = apply_unveil(got_repo_get_path(repo), NULL);
6126 	if (error)
6127 		goto done;
6128 
6129 	error = tog_load_refs(repo, 0);
6130 	if (error)
6131 		goto done;
6132 
6133 	if (id_str1 != NULL) {
6134 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6135 		    repo, worktree);
6136 		if (error != NULL)
6137 			goto done;
6138 		if (keyword_idstr1 != NULL)
6139 			id_str1 = keyword_idstr1;
6140 	}
6141 	if (id_str2 != NULL) {
6142 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6143 		    repo, worktree);
6144 		if (error != NULL)
6145 			goto done;
6146 		if (keyword_idstr2 != NULL)
6147 			id_str2 = keyword_idstr2;
6148 	}
6149 
6150 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6151 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6152 	if (error)
6153 		goto done;
6154 
6155 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6156 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6157 	if (error)
6158 		goto done;
6159 
6160 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6161 	if (view == NULL) {
6162 		error = got_error_from_errno("view_open");
6163 		goto done;
6164 	}
6165 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6166 	    ignore_whitespace, force_text_diff, NULL,  repo);
6167 	if (error)
6168 		goto done;
6169 
6170 	if (worktree) {
6171 		error = set_tog_base_commit(repo, worktree);
6172 		if (error != NULL)
6173 			goto done;
6174 
6175 		/* Release work tree lock. */
6176 		got_worktree_close(worktree);
6177 		worktree = NULL;
6178 	}
6179 
6180 	error = view_loop(view);
6181 
6182 done:
6183 	free(tog_base_commit.id);
6184 	free(keyword_idstr1);
6185 	free(keyword_idstr2);
6186 	free(label1);
6187 	free(label2);
6188 	free(id1);
6189 	free(id2);
6190 	free(repo_path);
6191 	free(cwd);
6192 	if (repo) {
6193 		const struct got_error *close_err = got_repo_close(repo);
6194 		if (error == NULL)
6195 			error = close_err;
6196 	}
6197 	if (worktree)
6198 		got_worktree_close(worktree);
6199 	if (pack_fds) {
6200 		const struct got_error *pack_err =
6201 		    got_repo_pack_fds_close(pack_fds);
6202 		if (error == NULL)
6203 			error = pack_err;
6204 	}
6205 	tog_free_refs();
6206 	return error;
6207 }
6208 
6209 __dead static void
6210 usage_blame(void)
6211 {
6212 	endwin();
6213 	fprintf(stderr,
6214 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6215 	    getprogname());
6216 	exit(1);
6217 }
6218 
6219 struct tog_blame_line {
6220 	int annotated;
6221 	struct got_object_id *id;
6222 };
6223 
6224 static const struct got_error *
6225 draw_blame(struct tog_view *view)
6226 {
6227 	struct tog_blame_view_state *s = &view->state.blame;
6228 	struct tog_blame *blame = &s->blame;
6229 	regmatch_t *regmatch = &view->regmatch;
6230 	const struct got_error *err;
6231 	int lineno = 0, nprinted = 0;
6232 	char *line = NULL;
6233 	size_t linesize = 0;
6234 	ssize_t linelen;
6235 	wchar_t *wline;
6236 	int width;
6237 	struct tog_blame_line *blame_line;
6238 	struct got_object_id *prev_id = NULL;
6239 	char *id_str;
6240 	struct tog_color *tc;
6241 
6242 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6243 	if (err)
6244 		return err;
6245 
6246 	rewind(blame->f);
6247 	werase(view->window);
6248 
6249 	if (asprintf(&line, "commit %s", id_str) == -1) {
6250 		err = got_error_from_errno("asprintf");
6251 		free(id_str);
6252 		return err;
6253 	}
6254 
6255 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6256 	free(line);
6257 	line = NULL;
6258 	if (err)
6259 		return err;
6260 	if (view_needs_focus_indication(view))
6261 		wstandout(view->window);
6262 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6263 	if (tc)
6264 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6265 	waddwstr(view->window, wline);
6266 	while (width++ < view->ncols)
6267 		waddch(view->window, ' ');
6268 	if (tc)
6269 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6270 	if (view_needs_focus_indication(view))
6271 		wstandend(view->window);
6272 	free(wline);
6273 	wline = NULL;
6274 
6275 	if (view->gline > blame->nlines)
6276 		view->gline = blame->nlines;
6277 
6278 	if (tog_io.wait_for_ui) {
6279 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6280 		int rc;
6281 
6282 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6283 		if (rc)
6284 			return got_error_set_errno(rc, "pthread_cond_wait");
6285 		tog_io.wait_for_ui = 0;
6286 	}
6287 
6288 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6289 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6290 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6291 		free(id_str);
6292 		return got_error_from_errno("asprintf");
6293 	}
6294 	free(id_str);
6295 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6296 	free(line);
6297 	line = NULL;
6298 	if (err)
6299 		return err;
6300 	waddwstr(view->window, wline);
6301 	free(wline);
6302 	wline = NULL;
6303 	if (width < view->ncols - 1)
6304 		waddch(view->window, '\n');
6305 
6306 	s->eof = 0;
6307 	view->maxx = 0;
6308 	while (nprinted < view->nlines - 2) {
6309 		linelen = getline(&line, &linesize, blame->f);
6310 		if (linelen == -1) {
6311 			if (feof(blame->f)) {
6312 				s->eof = 1;
6313 				break;
6314 			}
6315 			free(line);
6316 			return got_ferror(blame->f, GOT_ERR_IO);
6317 		}
6318 		if (++lineno < s->first_displayed_line)
6319 			continue;
6320 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6321 			continue;
6322 
6323 		/* Set view->maxx based on full line length. */
6324 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6325 		if (err) {
6326 			free(line);
6327 			return err;
6328 		}
6329 		free(wline);
6330 		wline = NULL;
6331 		view->maxx = MAX(view->maxx, width);
6332 
6333 		if (nprinted == s->selected_line - 1)
6334 			wstandout(view->window);
6335 
6336 		if (blame->nlines > 0) {
6337 			blame_line = &blame->lines[lineno - 1];
6338 			if (blame_line->annotated && prev_id &&
6339 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6340 			    !(nprinted == s->selected_line - 1)) {
6341 				waddstr(view->window, "        ");
6342 			} else if (blame_line->annotated) {
6343 				char *id_str;
6344 				err = got_object_id_str(&id_str,
6345 				    blame_line->id);
6346 				if (err) {
6347 					free(line);
6348 					return err;
6349 				}
6350 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6351 				if (tc)
6352 					wattr_on(view->window,
6353 					    COLOR_PAIR(tc->colorpair), NULL);
6354 				wprintw(view->window, "%.8s", id_str);
6355 				if (tc)
6356 					wattr_off(view->window,
6357 					    COLOR_PAIR(tc->colorpair), NULL);
6358 				free(id_str);
6359 				prev_id = blame_line->id;
6360 			} else {
6361 				waddstr(view->window, "........");
6362 				prev_id = NULL;
6363 			}
6364 		} else {
6365 			waddstr(view->window, "........");
6366 			prev_id = NULL;
6367 		}
6368 
6369 		if (nprinted == s->selected_line - 1)
6370 			wstandend(view->window);
6371 		waddstr(view->window, " ");
6372 
6373 		if (view->ncols <= 9) {
6374 			width = 9;
6375 		} else if (s->first_displayed_line + nprinted ==
6376 		    s->matched_line &&
6377 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6378 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6379 			    view->window, view->x, regmatch);
6380 			if (err) {
6381 				free(line);
6382 				return err;
6383 			}
6384 			width += 9;
6385 		} else {
6386 			int skip;
6387 			err = format_line(&wline, &width, &skip, line,
6388 			    view->x, view->ncols - 9, 9, 1);
6389 			if (err) {
6390 				free(line);
6391 				return err;
6392 			}
6393 			waddwstr(view->window, &wline[skip]);
6394 			width += 9;
6395 			free(wline);
6396 			wline = NULL;
6397 		}
6398 
6399 		if (width <= view->ncols - 1)
6400 			waddch(view->window, '\n');
6401 		if (++nprinted == 1)
6402 			s->first_displayed_line = lineno;
6403 	}
6404 	free(line);
6405 	s->last_displayed_line = lineno;
6406 
6407 	view_border(view);
6408 
6409 	return NULL;
6410 }
6411 
6412 static const struct got_error *
6413 blame_cb(void *arg, int nlines, int lineno,
6414     struct got_commit_object *commit, struct got_object_id *id)
6415 {
6416 	const struct got_error *err = NULL;
6417 	struct tog_blame_cb_args *a = arg;
6418 	struct tog_blame_line *line;
6419 	int errcode;
6420 
6421 	if (nlines != a->nlines ||
6422 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6423 		return got_error(GOT_ERR_RANGE);
6424 
6425 	errcode = pthread_mutex_lock(&tog_mutex);
6426 	if (errcode)
6427 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6428 
6429 	if (*a->quit) {	/* user has quit the blame view */
6430 		err = got_error(GOT_ERR_ITER_COMPLETED);
6431 		goto done;
6432 	}
6433 
6434 	if (lineno == -1)
6435 		goto done; /* no change in this commit */
6436 
6437 	line = &a->lines[lineno - 1];
6438 	if (line->annotated)
6439 		goto done;
6440 
6441 	line->id = got_object_id_dup(id);
6442 	if (line->id == NULL) {
6443 		err = got_error_from_errno("got_object_id_dup");
6444 		goto done;
6445 	}
6446 	line->annotated = 1;
6447 done:
6448 	errcode = pthread_mutex_unlock(&tog_mutex);
6449 	if (errcode)
6450 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6451 	return err;
6452 }
6453 
6454 static void *
6455 blame_thread(void *arg)
6456 {
6457 	const struct got_error *err, *close_err;
6458 	struct tog_blame_thread_args *ta = arg;
6459 	struct tog_blame_cb_args *a = ta->cb_args;
6460 	int errcode, fd1 = -1, fd2 = -1;
6461 	FILE *f1 = NULL, *f2 = NULL;
6462 
6463 	fd1 = got_opentempfd();
6464 	if (fd1 == -1)
6465 		return (void *)got_error_from_errno("got_opentempfd");
6466 
6467 	fd2 = got_opentempfd();
6468 	if (fd2 == -1) {
6469 		err = got_error_from_errno("got_opentempfd");
6470 		goto done;
6471 	}
6472 
6473 	f1 = got_opentemp();
6474 	if (f1 == NULL) {
6475 		err = (void *)got_error_from_errno("got_opentemp");
6476 		goto done;
6477 	}
6478 	f2 = got_opentemp();
6479 	if (f2 == NULL) {
6480 		err = (void *)got_error_from_errno("got_opentemp");
6481 		goto done;
6482 	}
6483 
6484 	err = block_signals_used_by_main_thread();
6485 	if (err)
6486 		goto done;
6487 
6488 	err = got_blame(ta->path, a->commit_id, ta->repo,
6489 	    tog_diff_algo, blame_cb, ta->cb_args,
6490 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6491 	if (err && err->code == GOT_ERR_CANCELLED)
6492 		err = NULL;
6493 
6494 	errcode = pthread_mutex_lock(&tog_mutex);
6495 	if (errcode) {
6496 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6497 		goto done;
6498 	}
6499 
6500 	close_err = got_repo_close(ta->repo);
6501 	if (err == NULL)
6502 		err = close_err;
6503 	ta->repo = NULL;
6504 	*ta->complete = 1;
6505 
6506 	if (tog_io.wait_for_ui) {
6507 		errcode = pthread_cond_signal(&ta->blame_complete);
6508 		if (errcode && err == NULL)
6509 			err = got_error_set_errno(errcode,
6510 			    "pthread_cond_signal");
6511 	}
6512 
6513 	errcode = pthread_mutex_unlock(&tog_mutex);
6514 	if (errcode && err == NULL)
6515 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6516 
6517 done:
6518 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6519 		err = got_error_from_errno("close");
6520 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6521 		err = got_error_from_errno("close");
6522 	if (f1 && fclose(f1) == EOF && err == NULL)
6523 		err = got_error_from_errno("fclose");
6524 	if (f2 && fclose(f2) == EOF && err == NULL)
6525 		err = got_error_from_errno("fclose");
6526 
6527 	return (void *)err;
6528 }
6529 
6530 static struct got_object_id *
6531 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6532     int first_displayed_line, int selected_line)
6533 {
6534 	struct tog_blame_line *line;
6535 
6536 	if (nlines <= 0)
6537 		return NULL;
6538 
6539 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6540 	if (!line->annotated)
6541 		return NULL;
6542 
6543 	return line->id;
6544 }
6545 
6546 static struct got_object_id *
6547 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6548     int lineno)
6549 {
6550 	struct tog_blame_line *line;
6551 
6552 	if (nlines <= 0 || lineno >= nlines)
6553 		return NULL;
6554 
6555 	line = &lines[lineno - 1];
6556 	if (!line->annotated)
6557 		return NULL;
6558 
6559 	return line->id;
6560 }
6561 
6562 static const struct got_error *
6563 stop_blame(struct tog_blame *blame)
6564 {
6565 	const struct got_error *err = NULL;
6566 	int i;
6567 
6568 	if (blame->thread) {
6569 		int errcode;
6570 		errcode = pthread_mutex_unlock(&tog_mutex);
6571 		if (errcode)
6572 			return got_error_set_errno(errcode,
6573 			    "pthread_mutex_unlock");
6574 		errcode = pthread_join(blame->thread, (void **)&err);
6575 		if (errcode)
6576 			return got_error_set_errno(errcode, "pthread_join");
6577 		errcode = pthread_mutex_lock(&tog_mutex);
6578 		if (errcode)
6579 			return got_error_set_errno(errcode,
6580 			    "pthread_mutex_lock");
6581 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6582 			err = NULL;
6583 		blame->thread = NULL;
6584 	}
6585 	if (blame->thread_args.repo) {
6586 		const struct got_error *close_err;
6587 		close_err = got_repo_close(blame->thread_args.repo);
6588 		if (err == NULL)
6589 			err = close_err;
6590 		blame->thread_args.repo = NULL;
6591 	}
6592 	if (blame->f) {
6593 		if (fclose(blame->f) == EOF && err == NULL)
6594 			err = got_error_from_errno("fclose");
6595 		blame->f = NULL;
6596 	}
6597 	if (blame->lines) {
6598 		for (i = 0; i < blame->nlines; i++)
6599 			free(blame->lines[i].id);
6600 		free(blame->lines);
6601 		blame->lines = NULL;
6602 	}
6603 	free(blame->cb_args.commit_id);
6604 	blame->cb_args.commit_id = NULL;
6605 	if (blame->pack_fds) {
6606 		const struct got_error *pack_err =
6607 		    got_repo_pack_fds_close(blame->pack_fds);
6608 		if (err == NULL)
6609 			err = pack_err;
6610 		blame->pack_fds = NULL;
6611 	}
6612 	free(blame->line_offsets);
6613 	blame->line_offsets = NULL;
6614 	return err;
6615 }
6616 
6617 static const struct got_error *
6618 cancel_blame_view(void *arg)
6619 {
6620 	const struct got_error *err = NULL;
6621 	int *done = arg;
6622 	int errcode;
6623 
6624 	errcode = pthread_mutex_lock(&tog_mutex);
6625 	if (errcode)
6626 		return got_error_set_errno(errcode,
6627 		    "pthread_mutex_unlock");
6628 
6629 	if (*done)
6630 		err = got_error(GOT_ERR_CANCELLED);
6631 
6632 	errcode = pthread_mutex_unlock(&tog_mutex);
6633 	if (errcode)
6634 		return got_error_set_errno(errcode,
6635 		    "pthread_mutex_lock");
6636 
6637 	return err;
6638 }
6639 
6640 static const struct got_error *
6641 run_blame(struct tog_view *view)
6642 {
6643 	struct tog_blame_view_state *s = &view->state.blame;
6644 	struct tog_blame *blame = &s->blame;
6645 	const struct got_error *err = NULL;
6646 	struct got_commit_object *commit = NULL;
6647 	struct got_blob_object *blob = NULL;
6648 	struct got_repository *thread_repo = NULL;
6649 	struct got_object_id *obj_id = NULL;
6650 	int obj_type, fd = -1;
6651 	int *pack_fds = NULL;
6652 
6653 	err = got_object_open_as_commit(&commit, s->repo,
6654 	    &s->blamed_commit->id);
6655 	if (err)
6656 		return err;
6657 
6658 	fd = got_opentempfd();
6659 	if (fd == -1) {
6660 		err = got_error_from_errno("got_opentempfd");
6661 		goto done;
6662 	}
6663 
6664 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6665 	if (err)
6666 		goto done;
6667 
6668 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6669 	if (err)
6670 		goto done;
6671 
6672 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6673 		err = got_error(GOT_ERR_OBJ_TYPE);
6674 		goto done;
6675 	}
6676 
6677 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6678 	if (err)
6679 		goto done;
6680 	blame->f = got_opentemp();
6681 	if (blame->f == NULL) {
6682 		err = got_error_from_errno("got_opentemp");
6683 		goto done;
6684 	}
6685 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6686 	    &blame->line_offsets, blame->f, blob);
6687 	if (err)
6688 		goto done;
6689 	if (blame->nlines == 0) {
6690 		s->blame_complete = 1;
6691 		goto done;
6692 	}
6693 
6694 	/* Don't include \n at EOF in the blame line count. */
6695 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6696 		blame->nlines--;
6697 
6698 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6699 	if (blame->lines == NULL) {
6700 		err = got_error_from_errno("calloc");
6701 		goto done;
6702 	}
6703 
6704 	err = got_repo_pack_fds_open(&pack_fds);
6705 	if (err)
6706 		goto done;
6707 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6708 	    pack_fds);
6709 	if (err)
6710 		goto done;
6711 
6712 	blame->pack_fds = pack_fds;
6713 	blame->cb_args.view = view;
6714 	blame->cb_args.lines = blame->lines;
6715 	blame->cb_args.nlines = blame->nlines;
6716 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6717 	if (blame->cb_args.commit_id == NULL) {
6718 		err = got_error_from_errno("got_object_id_dup");
6719 		goto done;
6720 	}
6721 	blame->cb_args.quit = &s->done;
6722 
6723 	blame->thread_args.path = s->path;
6724 	blame->thread_args.repo = thread_repo;
6725 	blame->thread_args.cb_args = &blame->cb_args;
6726 	blame->thread_args.complete = &s->blame_complete;
6727 	blame->thread_args.cancel_cb = cancel_blame_view;
6728 	blame->thread_args.cancel_arg = &s->done;
6729 	s->blame_complete = 0;
6730 
6731 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6732 		s->first_displayed_line = 1;
6733 		s->last_displayed_line = view->nlines;
6734 		s->selected_line = 1;
6735 	}
6736 	s->matched_line = 0;
6737 
6738 done:
6739 	if (commit)
6740 		got_object_commit_close(commit);
6741 	if (fd != -1 && close(fd) == -1 && err == NULL)
6742 		err = got_error_from_errno("close");
6743 	if (blob)
6744 		got_object_blob_close(blob);
6745 	free(obj_id);
6746 	if (err)
6747 		stop_blame(blame);
6748 	return err;
6749 }
6750 
6751 static const struct got_error *
6752 open_blame_view(struct tog_view *view, char *path,
6753     struct got_object_id *commit_id, struct got_repository *repo)
6754 {
6755 	const struct got_error *err = NULL;
6756 	struct tog_blame_view_state *s = &view->state.blame;
6757 
6758 	STAILQ_INIT(&s->blamed_commits);
6759 
6760 	s->path = strdup(path);
6761 	if (s->path == NULL)
6762 		return got_error_from_errno("strdup");
6763 
6764 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6765 	if (err) {
6766 		free(s->path);
6767 		return err;
6768 	}
6769 
6770 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6771 	s->first_displayed_line = 1;
6772 	s->last_displayed_line = view->nlines;
6773 	s->selected_line = 1;
6774 	s->blame_complete = 0;
6775 	s->repo = repo;
6776 	s->commit_id = commit_id;
6777 	memset(&s->blame, 0, sizeof(s->blame));
6778 
6779 	STAILQ_INIT(&s->colors);
6780 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6781 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6782 		    get_color_value("TOG_COLOR_COMMIT"));
6783 		if (err)
6784 			return err;
6785 	}
6786 
6787 	view->show = show_blame_view;
6788 	view->input = input_blame_view;
6789 	view->reset = reset_blame_view;
6790 	view->close = close_blame_view;
6791 	view->search_start = search_start_blame_view;
6792 	view->search_setup = search_setup_blame_view;
6793 	view->search_next = search_next_view_match;
6794 
6795 	if (using_mock_io) {
6796 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6797 		int rc;
6798 
6799 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6800 		if (rc)
6801 			return got_error_set_errno(rc, "pthread_cond_init");
6802 	}
6803 
6804 	return run_blame(view);
6805 }
6806 
6807 static const struct got_error *
6808 close_blame_view(struct tog_view *view)
6809 {
6810 	const struct got_error *err = NULL;
6811 	struct tog_blame_view_state *s = &view->state.blame;
6812 
6813 	if (s->blame.thread)
6814 		err = stop_blame(&s->blame);
6815 
6816 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6817 		struct got_object_qid *blamed_commit;
6818 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6819 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6820 		got_object_qid_free(blamed_commit);
6821 	}
6822 
6823 	if (using_mock_io) {
6824 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6825 		int rc;
6826 
6827 		rc = pthread_cond_destroy(&bta->blame_complete);
6828 		if (rc && err == NULL)
6829 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6830 	}
6831 
6832 	free(s->path);
6833 	free_colors(&s->colors);
6834 	return err;
6835 }
6836 
6837 static const struct got_error *
6838 search_start_blame_view(struct tog_view *view)
6839 {
6840 	struct tog_blame_view_state *s = &view->state.blame;
6841 
6842 	s->matched_line = 0;
6843 	return NULL;
6844 }
6845 
6846 static void
6847 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6848     size_t *nlines, int **first, int **last, int **match, int **selected)
6849 {
6850 	struct tog_blame_view_state *s = &view->state.blame;
6851 
6852 	*f = s->blame.f;
6853 	*nlines = s->blame.nlines;
6854 	*line_offsets = s->blame.line_offsets;
6855 	*match = &s->matched_line;
6856 	*first = &s->first_displayed_line;
6857 	*last = &s->last_displayed_line;
6858 	*selected = &s->selected_line;
6859 }
6860 
6861 static const struct got_error *
6862 show_blame_view(struct tog_view *view)
6863 {
6864 	const struct got_error *err = NULL;
6865 	struct tog_blame_view_state *s = &view->state.blame;
6866 	int errcode;
6867 
6868 	if (s->blame.thread == NULL && !s->blame_complete) {
6869 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6870 		    &s->blame.thread_args);
6871 		if (errcode)
6872 			return got_error_set_errno(errcode, "pthread_create");
6873 
6874 		if (!using_mock_io)
6875 			halfdelay(1); /* fast refresh while annotating  */
6876 	}
6877 
6878 	if (s->blame_complete && !using_mock_io)
6879 		halfdelay(10); /* disable fast refresh */
6880 
6881 	err = draw_blame(view);
6882 
6883 	view_border(view);
6884 	return err;
6885 }
6886 
6887 static const struct got_error *
6888 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6889     struct got_repository *repo, struct got_object_id *id)
6890 {
6891 	struct tog_view		*log_view;
6892 	const struct got_error	*err = NULL;
6893 
6894 	*new_view = NULL;
6895 
6896 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6897 	if (log_view == NULL)
6898 		return got_error_from_errno("view_open");
6899 
6900 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6901 	if (err)
6902 		view_close(log_view);
6903 	else
6904 		*new_view = log_view;
6905 
6906 	return err;
6907 }
6908 
6909 static const struct got_error *
6910 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6911 {
6912 	const struct got_error *err = NULL, *thread_err = NULL;
6913 	struct tog_view *diff_view;
6914 	struct tog_blame_view_state *s = &view->state.blame;
6915 	int eos, nscroll, begin_y = 0, begin_x = 0;
6916 
6917 	eos = nscroll = view->nlines - 2;
6918 	if (view_is_hsplit_top(view))
6919 		--eos;  /* border */
6920 
6921 	switch (ch) {
6922 	case '0':
6923 	case '$':
6924 	case KEY_RIGHT:
6925 	case 'l':
6926 	case KEY_LEFT:
6927 	case 'h':
6928 		horizontal_scroll_input(view, ch);
6929 		break;
6930 	case 'q':
6931 		s->done = 1;
6932 		break;
6933 	case 'g':
6934 	case KEY_HOME:
6935 		s->selected_line = 1;
6936 		s->first_displayed_line = 1;
6937 		view->count = 0;
6938 		break;
6939 	case 'G':
6940 	case KEY_END:
6941 		if (s->blame.nlines < eos) {
6942 			s->selected_line = s->blame.nlines;
6943 			s->first_displayed_line = 1;
6944 		} else {
6945 			s->selected_line = eos;
6946 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6947 		}
6948 		view->count = 0;
6949 		break;
6950 	case 'k':
6951 	case KEY_UP:
6952 	case CTRL('p'):
6953 		if (s->selected_line > 1)
6954 			s->selected_line--;
6955 		else if (s->selected_line == 1 &&
6956 		    s->first_displayed_line > 1)
6957 			s->first_displayed_line--;
6958 		else
6959 			view->count = 0;
6960 		break;
6961 	case CTRL('u'):
6962 	case 'u':
6963 		nscroll /= 2;
6964 		/* FALL THROUGH */
6965 	case KEY_PPAGE:
6966 	case CTRL('b'):
6967 	case 'b':
6968 		if (s->first_displayed_line == 1) {
6969 			if (view->count > 1)
6970 				nscroll += nscroll;
6971 			s->selected_line = MAX(1, s->selected_line - nscroll);
6972 			view->count = 0;
6973 			break;
6974 		}
6975 		if (s->first_displayed_line > nscroll)
6976 			s->first_displayed_line -= nscroll;
6977 		else
6978 			s->first_displayed_line = 1;
6979 		break;
6980 	case 'j':
6981 	case KEY_DOWN:
6982 	case CTRL('n'):
6983 		if (s->selected_line < eos && s->first_displayed_line +
6984 		    s->selected_line <= s->blame.nlines)
6985 			s->selected_line++;
6986 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6987 			s->first_displayed_line++;
6988 		else
6989 			view->count = 0;
6990 		break;
6991 	case 'c':
6992 	case 'p': {
6993 		struct got_object_id *id = NULL;
6994 
6995 		view->count = 0;
6996 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6997 		    s->first_displayed_line, s->selected_line);
6998 		if (id == NULL)
6999 			break;
7000 		if (ch == 'p') {
7001 			struct got_commit_object *commit, *pcommit;
7002 			struct got_object_qid *pid;
7003 			struct got_object_id *blob_id = NULL;
7004 			int obj_type;
7005 			err = got_object_open_as_commit(&commit,
7006 			    s->repo, id);
7007 			if (err)
7008 				break;
7009 			pid = STAILQ_FIRST(
7010 			    got_object_commit_get_parent_ids(commit));
7011 			if (pid == NULL) {
7012 				got_object_commit_close(commit);
7013 				break;
7014 			}
7015 			/* Check if path history ends here. */
7016 			err = got_object_open_as_commit(&pcommit,
7017 			    s->repo, &pid->id);
7018 			if (err)
7019 				break;
7020 			err = got_object_id_by_path(&blob_id, s->repo,
7021 			    pcommit, s->path);
7022 			got_object_commit_close(pcommit);
7023 			if (err) {
7024 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7025 					err = NULL;
7026 				got_object_commit_close(commit);
7027 				break;
7028 			}
7029 			err = got_object_get_type(&obj_type, s->repo,
7030 			    blob_id);
7031 			free(blob_id);
7032 			/* Can't blame non-blob type objects. */
7033 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7034 				got_object_commit_close(commit);
7035 				break;
7036 			}
7037 			err = got_object_qid_alloc(&s->blamed_commit,
7038 			    &pid->id);
7039 			got_object_commit_close(commit);
7040 		} else {
7041 			if (got_object_id_cmp(id,
7042 			    &s->blamed_commit->id) == 0)
7043 				break;
7044 			err = got_object_qid_alloc(&s->blamed_commit,
7045 			    id);
7046 		}
7047 		if (err)
7048 			break;
7049 		s->done = 1;
7050 		thread_err = stop_blame(&s->blame);
7051 		s->done = 0;
7052 		if (thread_err)
7053 			break;
7054 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7055 		    s->blamed_commit, entry);
7056 		err = run_blame(view);
7057 		if (err)
7058 			break;
7059 		break;
7060 	}
7061 	case 'C': {
7062 		struct got_object_qid *first;
7063 
7064 		view->count = 0;
7065 		first = STAILQ_FIRST(&s->blamed_commits);
7066 		if (!got_object_id_cmp(&first->id, s->commit_id))
7067 			break;
7068 		s->done = 1;
7069 		thread_err = stop_blame(&s->blame);
7070 		s->done = 0;
7071 		if (thread_err)
7072 			break;
7073 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7074 		got_object_qid_free(s->blamed_commit);
7075 		s->blamed_commit =
7076 		    STAILQ_FIRST(&s->blamed_commits);
7077 		err = run_blame(view);
7078 		if (err)
7079 			break;
7080 		break;
7081 	}
7082 	case 'L':
7083 		view->count = 0;
7084 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7085 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7086 		if (s->id_to_log)
7087 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7088 		break;
7089 	case KEY_ENTER:
7090 	case '\r': {
7091 		struct got_object_id *id = NULL;
7092 		struct got_object_qid *pid;
7093 		struct got_commit_object *commit = NULL;
7094 
7095 		view->count = 0;
7096 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7097 		    s->first_displayed_line, s->selected_line);
7098 		if (id == NULL)
7099 			break;
7100 		err = got_object_open_as_commit(&commit, s->repo, id);
7101 		if (err)
7102 			break;
7103 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7104 		if (*new_view) {
7105 			/* traversed from diff view, release diff resources  */
7106 			err = close_diff_view(*new_view);
7107 			if (err)
7108 				break;
7109 			diff_view = *new_view;
7110 		} else {
7111 			if (view_is_parent_view(view))
7112 				view_get_split(view, &begin_y, &begin_x);
7113 
7114 			diff_view = view_open(0, 0, begin_y, begin_x,
7115 			    TOG_VIEW_DIFF);
7116 			if (diff_view == NULL) {
7117 				got_object_commit_close(commit);
7118 				err = got_error_from_errno("view_open");
7119 				break;
7120 			}
7121 		}
7122 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7123 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7124 		got_object_commit_close(commit);
7125 		if (err)
7126 			break;
7127 		s->last_diffed_line = s->first_displayed_line - 1 +
7128 		    s->selected_line;
7129 		if (*new_view)
7130 			break;	/* still open from active diff view */
7131 		if (view_is_parent_view(view) &&
7132 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7133 			err = view_init_hsplit(view, begin_y);
7134 			if (err)
7135 				break;
7136 		}
7137 
7138 		view->focussed = 0;
7139 		diff_view->focussed = 1;
7140 		diff_view->mode = view->mode;
7141 		diff_view->nlines = view->lines - begin_y;
7142 		if (view_is_parent_view(view)) {
7143 			view_transfer_size(diff_view, view);
7144 			err = view_close_child(view);
7145 			if (err)
7146 				break;
7147 			err = view_set_child(view, diff_view);
7148 			if (err)
7149 				break;
7150 			view->focus_child = 1;
7151 		} else
7152 			*new_view = diff_view;
7153 		if (err)
7154 			break;
7155 		break;
7156 	}
7157 	case CTRL('d'):
7158 	case 'd':
7159 		nscroll /= 2;
7160 		/* FALL THROUGH */
7161 	case KEY_NPAGE:
7162 	case CTRL('f'):
7163 	case 'f':
7164 	case ' ':
7165 		if (s->last_displayed_line >= s->blame.nlines &&
7166 		    s->selected_line >= MIN(s->blame.nlines,
7167 		    view->nlines - 2)) {
7168 			view->count = 0;
7169 			break;
7170 		}
7171 		if (s->last_displayed_line >= s->blame.nlines &&
7172 		    s->selected_line < view->nlines - 2) {
7173 			s->selected_line +=
7174 			    MIN(nscroll, s->last_displayed_line -
7175 			    s->first_displayed_line - s->selected_line + 1);
7176 		}
7177 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7178 			s->first_displayed_line += nscroll;
7179 		else
7180 			s->first_displayed_line =
7181 			    s->blame.nlines - (view->nlines - 3);
7182 		break;
7183 	case KEY_RESIZE:
7184 		if (s->selected_line > view->nlines - 2) {
7185 			s->selected_line = MIN(s->blame.nlines,
7186 			    view->nlines - 2);
7187 		}
7188 		break;
7189 	default:
7190 		view->count = 0;
7191 		break;
7192 	}
7193 	return thread_err ? thread_err : err;
7194 }
7195 
7196 static const struct got_error *
7197 reset_blame_view(struct tog_view *view)
7198 {
7199 	const struct got_error *err;
7200 	struct tog_blame_view_state *s = &view->state.blame;
7201 
7202 	view->count = 0;
7203 	s->done = 1;
7204 	err = stop_blame(&s->blame);
7205 	s->done = 0;
7206 	if (err)
7207 		return err;
7208 	return run_blame(view);
7209 }
7210 
7211 static const struct got_error *
7212 cmd_blame(int argc, char *argv[])
7213 {
7214 	const struct got_error *error;
7215 	struct got_repository *repo = NULL;
7216 	struct got_worktree *worktree = NULL;
7217 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7218 	char *link_target = NULL;
7219 	struct got_object_id *commit_id = NULL;
7220 	struct got_commit_object *commit = NULL;
7221 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7222 	int ch;
7223 	struct tog_view *view = NULL;
7224 	int *pack_fds = NULL;
7225 
7226 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7227 		switch (ch) {
7228 		case 'c':
7229 			commit_id_str = optarg;
7230 			break;
7231 		case 'r':
7232 			repo_path = realpath(optarg, NULL);
7233 			if (repo_path == NULL)
7234 				return got_error_from_errno2("realpath",
7235 				    optarg);
7236 			break;
7237 		default:
7238 			usage_blame();
7239 			/* NOTREACHED */
7240 		}
7241 	}
7242 
7243 	argc -= optind;
7244 	argv += optind;
7245 
7246 	if (argc != 1)
7247 		usage_blame();
7248 
7249 	error = got_repo_pack_fds_open(&pack_fds);
7250 	if (error != NULL)
7251 		goto done;
7252 
7253 	if (repo_path == NULL) {
7254 		cwd = getcwd(NULL, 0);
7255 		if (cwd == NULL)
7256 			return got_error_from_errno("getcwd");
7257 		error = got_worktree_open(&worktree, cwd, NULL);
7258 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7259 			goto done;
7260 		if (worktree)
7261 			repo_path =
7262 			    strdup(got_worktree_get_repo_path(worktree));
7263 		else
7264 			repo_path = strdup(cwd);
7265 		if (repo_path == NULL) {
7266 			error = got_error_from_errno("strdup");
7267 			goto done;
7268 		}
7269 	}
7270 
7271 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7272 	if (error != NULL)
7273 		goto done;
7274 
7275 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7276 	    worktree);
7277 	if (error)
7278 		goto done;
7279 
7280 	init_curses();
7281 
7282 	error = apply_unveil(got_repo_get_path(repo), NULL);
7283 	if (error)
7284 		goto done;
7285 
7286 	error = tog_load_refs(repo, 0);
7287 	if (error)
7288 		goto done;
7289 
7290 	if (commit_id_str == NULL) {
7291 		struct got_reference *head_ref;
7292 		error = got_ref_open(&head_ref, repo, worktree ?
7293 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7294 		if (error != NULL)
7295 			goto done;
7296 		error = got_ref_resolve(&commit_id, repo, head_ref);
7297 		got_ref_close(head_ref);
7298 	} else {
7299 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7300 		    repo, worktree);
7301 		if (error != NULL)
7302 			goto done;
7303 		if (keyword_idstr != NULL)
7304 			commit_id_str = keyword_idstr;
7305 
7306 		error = got_repo_match_object_id(&commit_id, NULL,
7307 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7308 	}
7309 	if (error != NULL)
7310 		goto done;
7311 
7312 	error = got_object_open_as_commit(&commit, repo, commit_id);
7313 	if (error)
7314 		goto done;
7315 
7316 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7317 	    commit, repo);
7318 	if (error)
7319 		goto done;
7320 
7321 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7322 	if (view == NULL) {
7323 		error = got_error_from_errno("view_open");
7324 		goto done;
7325 	}
7326 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7327 	    commit_id, repo);
7328 	if (error != NULL) {
7329 		if (view->close == NULL)
7330 			close_blame_view(view);
7331 		view_close(view);
7332 		goto done;
7333 	}
7334 
7335 	if (worktree) {
7336 		error = set_tog_base_commit(repo, worktree);
7337 		if (error != NULL)
7338 			goto done;
7339 
7340 		/* Release work tree lock. */
7341 		got_worktree_close(worktree);
7342 		worktree = NULL;
7343 	}
7344 
7345 	error = view_loop(view);
7346 
7347 done:
7348 	free(tog_base_commit.id);
7349 	free(repo_path);
7350 	free(in_repo_path);
7351 	free(link_target);
7352 	free(cwd);
7353 	free(commit_id);
7354 	free(keyword_idstr);
7355 	if (commit)
7356 		got_object_commit_close(commit);
7357 	if (worktree)
7358 		got_worktree_close(worktree);
7359 	if (repo) {
7360 		const struct got_error *close_err = got_repo_close(repo);
7361 		if (error == NULL)
7362 			error = close_err;
7363 	}
7364 	if (pack_fds) {
7365 		const struct got_error *pack_err =
7366 		    got_repo_pack_fds_close(pack_fds);
7367 		if (error == NULL)
7368 			error = pack_err;
7369 	}
7370 	tog_free_refs();
7371 	return error;
7372 }
7373 
7374 static const struct got_error *
7375 draw_tree_entries(struct tog_view *view, const char *parent_path)
7376 {
7377 	struct tog_tree_view_state *s = &view->state.tree;
7378 	const struct got_error *err = NULL;
7379 	struct got_tree_entry *te;
7380 	wchar_t *wline;
7381 	char *index = NULL;
7382 	struct tog_color *tc;
7383 	int width, n, nentries, scrollx, i = 1;
7384 	int limit = view->nlines;
7385 
7386 	s->ndisplayed = 0;
7387 	if (view_is_hsplit_top(view))
7388 		--limit;  /* border */
7389 
7390 	werase(view->window);
7391 
7392 	if (limit == 0)
7393 		return NULL;
7394 
7395 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7396 	    0, 0);
7397 	if (err)
7398 		return err;
7399 	if (view_needs_focus_indication(view))
7400 		wstandout(view->window);
7401 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7402 	if (tc)
7403 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7404 	waddwstr(view->window, wline);
7405 	free(wline);
7406 	wline = NULL;
7407 	while (width++ < view->ncols)
7408 		waddch(view->window, ' ');
7409 	if (tc)
7410 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7411 	if (view_needs_focus_indication(view))
7412 		wstandend(view->window);
7413 	if (--limit <= 0)
7414 		return NULL;
7415 
7416 	i += s->selected;
7417 	if (s->first_displayed_entry) {
7418 		i += got_tree_entry_get_index(s->first_displayed_entry);
7419 		if (s->tree != s->root)
7420 			++i;  /* account for ".." entry */
7421 	}
7422 	nentries = got_object_tree_get_nentries(s->tree);
7423 	if (asprintf(&index, "[%d/%d] %s",
7424 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7425 		return got_error_from_errno("asprintf");
7426 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7427 	free(index);
7428 	if (err)
7429 		return err;
7430 	waddwstr(view->window, wline);
7431 	free(wline);
7432 	wline = NULL;
7433 	if (width < view->ncols - 1)
7434 		waddch(view->window, '\n');
7435 	if (--limit <= 0)
7436 		return NULL;
7437 	waddch(view->window, '\n');
7438 	if (--limit <= 0)
7439 		return NULL;
7440 
7441 	if (s->first_displayed_entry == NULL) {
7442 		te = got_object_tree_get_first_entry(s->tree);
7443 		if (s->selected == 0) {
7444 			if (view->focussed)
7445 				wstandout(view->window);
7446 			s->selected_entry = NULL;
7447 		}
7448 		waddstr(view->window, "  ..\n");	/* parent directory */
7449 		if (s->selected == 0 && view->focussed)
7450 			wstandend(view->window);
7451 		s->ndisplayed++;
7452 		if (--limit <= 0)
7453 			return NULL;
7454 		n = 1;
7455 	} else {
7456 		n = 0;
7457 		te = s->first_displayed_entry;
7458 	}
7459 
7460 	view->maxx = 0;
7461 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7462 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7463 		const char *modestr = "";
7464 		mode_t mode;
7465 
7466 		te = got_object_tree_get_entry(s->tree, i);
7467 		mode = got_tree_entry_get_mode(te);
7468 
7469 		if (s->show_ids) {
7470 			err = got_object_id_str(&id_str,
7471 			    got_tree_entry_get_id(te));
7472 			if (err)
7473 				return got_error_from_errno(
7474 				    "got_object_id_str");
7475 		}
7476 		if (got_object_tree_entry_is_submodule(te))
7477 			modestr = "$";
7478 		else if (S_ISLNK(mode)) {
7479 			int i;
7480 
7481 			err = got_tree_entry_get_symlink_target(&link_target,
7482 			    te, s->repo);
7483 			if (err) {
7484 				free(id_str);
7485 				return err;
7486 			}
7487 			for (i = 0; link_target[i] != '\0'; i++) {
7488 				if (!isprint((unsigned char)link_target[i]))
7489 					link_target[i] = '?';
7490 			}
7491 			modestr = "@";
7492 		}
7493 		else if (S_ISDIR(mode))
7494 			modestr = "/";
7495 		else if (mode & S_IXUSR)
7496 			modestr = "*";
7497 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7498 		    got_tree_entry_get_name(te), modestr,
7499 		    link_target ? " -> ": "",
7500 		    link_target ? link_target : "") == -1) {
7501 			free(id_str);
7502 			free(link_target);
7503 			return got_error_from_errno("asprintf");
7504 		}
7505 		free(id_str);
7506 		free(link_target);
7507 
7508 		/* use full line width to determine view->maxx */
7509 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7510 		if (err) {
7511 			free(line);
7512 			break;
7513 		}
7514 		view->maxx = MAX(view->maxx, width);
7515 		free(wline);
7516 		wline = NULL;
7517 
7518 		err = format_line(&wline, &width, &scrollx, line, view->x,
7519 		    view->ncols, 0, 0);
7520 		if (err) {
7521 			free(line);
7522 			break;
7523 		}
7524 		if (n == s->selected) {
7525 			if (view->focussed)
7526 				wstandout(view->window);
7527 			s->selected_entry = te;
7528 		}
7529 		tc = match_color(&s->colors, line);
7530 		if (tc)
7531 			wattr_on(view->window,
7532 			    COLOR_PAIR(tc->colorpair), NULL);
7533 		waddwstr(view->window, &wline[scrollx]);
7534 		if (tc)
7535 			wattr_off(view->window,
7536 			    COLOR_PAIR(tc->colorpair), NULL);
7537 		if (width < view->ncols)
7538 			waddch(view->window, '\n');
7539 		if (n == s->selected && view->focussed)
7540 			wstandend(view->window);
7541 		free(line);
7542 		free(wline);
7543 		wline = NULL;
7544 		n++;
7545 		s->ndisplayed++;
7546 		s->last_displayed_entry = te;
7547 		if (--limit <= 0)
7548 			break;
7549 	}
7550 
7551 	return err;
7552 }
7553 
7554 static void
7555 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7556 {
7557 	struct got_tree_entry *te;
7558 	int isroot = s->tree == s->root;
7559 	int i = 0;
7560 
7561 	if (s->first_displayed_entry == NULL)
7562 		return;
7563 
7564 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7565 	while (i++ < maxscroll) {
7566 		if (te == NULL) {
7567 			if (!isroot)
7568 				s->first_displayed_entry = NULL;
7569 			break;
7570 		}
7571 		s->first_displayed_entry = te;
7572 		te = got_tree_entry_get_prev(s->tree, te);
7573 	}
7574 }
7575 
7576 static const struct got_error *
7577 tree_scroll_down(struct tog_view *view, int maxscroll)
7578 {
7579 	struct tog_tree_view_state *s = &view->state.tree;
7580 	struct got_tree_entry *next, *last;
7581 	int n = 0;
7582 
7583 	if (s->first_displayed_entry)
7584 		next = got_tree_entry_get_next(s->tree,
7585 		    s->first_displayed_entry);
7586 	else
7587 		next = got_object_tree_get_first_entry(s->tree);
7588 
7589 	last = s->last_displayed_entry;
7590 	while (next && n++ < maxscroll) {
7591 		if (last) {
7592 			s->last_displayed_entry = last;
7593 			last = got_tree_entry_get_next(s->tree, last);
7594 		}
7595 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7596 			s->first_displayed_entry = next;
7597 			next = got_tree_entry_get_next(s->tree, next);
7598 		}
7599 	}
7600 
7601 	return NULL;
7602 }
7603 
7604 static const struct got_error *
7605 tree_entry_path(char **path, struct tog_parent_trees *parents,
7606     struct got_tree_entry *te)
7607 {
7608 	const struct got_error *err = NULL;
7609 	struct tog_parent_tree *pt;
7610 	size_t len = 2; /* for leading slash and NUL */
7611 
7612 	TAILQ_FOREACH(pt, parents, entry)
7613 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7614 		    + 1 /* slash */;
7615 	if (te)
7616 		len += strlen(got_tree_entry_get_name(te));
7617 
7618 	*path = calloc(1, len);
7619 	if (path == NULL)
7620 		return got_error_from_errno("calloc");
7621 
7622 	(*path)[0] = '/';
7623 	pt = TAILQ_LAST(parents, tog_parent_trees);
7624 	while (pt) {
7625 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7626 		if (strlcat(*path, name, len) >= len) {
7627 			err = got_error(GOT_ERR_NO_SPACE);
7628 			goto done;
7629 		}
7630 		if (strlcat(*path, "/", len) >= len) {
7631 			err = got_error(GOT_ERR_NO_SPACE);
7632 			goto done;
7633 		}
7634 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7635 	}
7636 	if (te) {
7637 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7638 			err = got_error(GOT_ERR_NO_SPACE);
7639 			goto done;
7640 		}
7641 	}
7642 done:
7643 	if (err) {
7644 		free(*path);
7645 		*path = NULL;
7646 	}
7647 	return err;
7648 }
7649 
7650 static const struct got_error *
7651 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7652     struct got_tree_entry *te, struct tog_parent_trees *parents,
7653     struct got_object_id *commit_id, struct got_repository *repo)
7654 {
7655 	const struct got_error *err = NULL;
7656 	char *path;
7657 	struct tog_view *blame_view;
7658 
7659 	*new_view = NULL;
7660 
7661 	err = tree_entry_path(&path, parents, te);
7662 	if (err)
7663 		return err;
7664 
7665 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7666 	if (blame_view == NULL) {
7667 		err = got_error_from_errno("view_open");
7668 		goto done;
7669 	}
7670 
7671 	err = open_blame_view(blame_view, path, commit_id, repo);
7672 	if (err) {
7673 		if (err->code == GOT_ERR_CANCELLED)
7674 			err = NULL;
7675 		view_close(blame_view);
7676 	} else
7677 		*new_view = blame_view;
7678 done:
7679 	free(path);
7680 	return err;
7681 }
7682 
7683 static const struct got_error *
7684 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7685     struct tog_tree_view_state *s)
7686 {
7687 	struct tog_view *log_view;
7688 	const struct got_error *err = NULL;
7689 	char *path;
7690 
7691 	*new_view = NULL;
7692 
7693 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7694 	if (log_view == NULL)
7695 		return got_error_from_errno("view_open");
7696 
7697 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7698 	if (err)
7699 		return err;
7700 
7701 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7702 	    path, 0, NULL);
7703 	if (err)
7704 		view_close(log_view);
7705 	else
7706 		*new_view = log_view;
7707 	free(path);
7708 	return err;
7709 }
7710 
7711 static const struct got_error *
7712 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7713     const char *head_ref_name, struct got_repository *repo)
7714 {
7715 	const struct got_error *err = NULL;
7716 	char *commit_id_str = NULL;
7717 	struct tog_tree_view_state *s = &view->state.tree;
7718 	struct got_commit_object *commit = NULL;
7719 
7720 	TAILQ_INIT(&s->parents);
7721 	STAILQ_INIT(&s->colors);
7722 
7723 	s->commit_id = got_object_id_dup(commit_id);
7724 	if (s->commit_id == NULL) {
7725 		err = got_error_from_errno("got_object_id_dup");
7726 		goto done;
7727 	}
7728 
7729 	err = got_object_open_as_commit(&commit, repo, commit_id);
7730 	if (err)
7731 		goto done;
7732 
7733 	/*
7734 	 * The root is opened here and will be closed when the view is closed.
7735 	 * Any visited subtrees and their path-wise parents are opened and
7736 	 * closed on demand.
7737 	 */
7738 	err = got_object_open_as_tree(&s->root, repo,
7739 	    got_object_commit_get_tree_id(commit));
7740 	if (err)
7741 		goto done;
7742 	s->tree = s->root;
7743 
7744 	err = got_object_id_str(&commit_id_str, commit_id);
7745 	if (err != NULL)
7746 		goto done;
7747 
7748 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7749 		err = got_error_from_errno("asprintf");
7750 		goto done;
7751 	}
7752 
7753 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7754 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7755 	if (head_ref_name) {
7756 		s->head_ref_name = strdup(head_ref_name);
7757 		if (s->head_ref_name == NULL) {
7758 			err = got_error_from_errno("strdup");
7759 			goto done;
7760 		}
7761 	}
7762 	s->repo = repo;
7763 
7764 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7765 		err = add_color(&s->colors, "\\$$",
7766 		    TOG_COLOR_TREE_SUBMODULE,
7767 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7768 		if (err)
7769 			goto done;
7770 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7771 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7772 		if (err)
7773 			goto done;
7774 		err = add_color(&s->colors, "/$",
7775 		    TOG_COLOR_TREE_DIRECTORY,
7776 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7777 		if (err)
7778 			goto done;
7779 
7780 		err = add_color(&s->colors, "\\*$",
7781 		    TOG_COLOR_TREE_EXECUTABLE,
7782 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7783 		if (err)
7784 			goto done;
7785 
7786 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7787 		    get_color_value("TOG_COLOR_COMMIT"));
7788 		if (err)
7789 			goto done;
7790 	}
7791 
7792 	view->show = show_tree_view;
7793 	view->input = input_tree_view;
7794 	view->close = close_tree_view;
7795 	view->search_start = search_start_tree_view;
7796 	view->search_next = search_next_tree_view;
7797 done:
7798 	free(commit_id_str);
7799 	if (commit)
7800 		got_object_commit_close(commit);
7801 	if (err) {
7802 		if (view->close == NULL)
7803 			close_tree_view(view);
7804 		view_close(view);
7805 	}
7806 	return err;
7807 }
7808 
7809 static const struct got_error *
7810 close_tree_view(struct tog_view *view)
7811 {
7812 	struct tog_tree_view_state *s = &view->state.tree;
7813 
7814 	free_colors(&s->colors);
7815 	free(s->tree_label);
7816 	s->tree_label = NULL;
7817 	free(s->commit_id);
7818 	s->commit_id = NULL;
7819 	free(s->head_ref_name);
7820 	s->head_ref_name = NULL;
7821 	while (!TAILQ_EMPTY(&s->parents)) {
7822 		struct tog_parent_tree *parent;
7823 		parent = TAILQ_FIRST(&s->parents);
7824 		TAILQ_REMOVE(&s->parents, parent, entry);
7825 		if (parent->tree != s->root)
7826 			got_object_tree_close(parent->tree);
7827 		free(parent);
7828 
7829 	}
7830 	if (s->tree != NULL && s->tree != s->root)
7831 		got_object_tree_close(s->tree);
7832 	if (s->root)
7833 		got_object_tree_close(s->root);
7834 	return NULL;
7835 }
7836 
7837 static const struct got_error *
7838 search_start_tree_view(struct tog_view *view)
7839 {
7840 	struct tog_tree_view_state *s = &view->state.tree;
7841 
7842 	s->matched_entry = NULL;
7843 	return NULL;
7844 }
7845 
7846 static int
7847 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7848 {
7849 	regmatch_t regmatch;
7850 
7851 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7852 	    0) == 0;
7853 }
7854 
7855 static const struct got_error *
7856 search_next_tree_view(struct tog_view *view)
7857 {
7858 	struct tog_tree_view_state *s = &view->state.tree;
7859 	struct got_tree_entry *te = NULL;
7860 
7861 	if (!view->searching) {
7862 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7863 		return NULL;
7864 	}
7865 
7866 	if (s->matched_entry) {
7867 		if (view->searching == TOG_SEARCH_FORWARD) {
7868 			if (s->selected_entry)
7869 				te = got_tree_entry_get_next(s->tree,
7870 				    s->selected_entry);
7871 			else
7872 				te = got_object_tree_get_first_entry(s->tree);
7873 		} else {
7874 			if (s->selected_entry == NULL)
7875 				te = got_object_tree_get_last_entry(s->tree);
7876 			else
7877 				te = got_tree_entry_get_prev(s->tree,
7878 				    s->selected_entry);
7879 		}
7880 	} else {
7881 		if (s->selected_entry)
7882 			te = s->selected_entry;
7883 		else if (view->searching == TOG_SEARCH_FORWARD)
7884 			te = got_object_tree_get_first_entry(s->tree);
7885 		else
7886 			te = got_object_tree_get_last_entry(s->tree);
7887 	}
7888 
7889 	while (1) {
7890 		if (te == NULL) {
7891 			if (s->matched_entry == NULL) {
7892 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7893 				return NULL;
7894 			}
7895 			if (view->searching == TOG_SEARCH_FORWARD)
7896 				te = got_object_tree_get_first_entry(s->tree);
7897 			else
7898 				te = got_object_tree_get_last_entry(s->tree);
7899 		}
7900 
7901 		if (match_tree_entry(te, &view->regex)) {
7902 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7903 			s->matched_entry = te;
7904 			break;
7905 		}
7906 
7907 		if (view->searching == TOG_SEARCH_FORWARD)
7908 			te = got_tree_entry_get_next(s->tree, te);
7909 		else
7910 			te = got_tree_entry_get_prev(s->tree, te);
7911 	}
7912 
7913 	if (s->matched_entry) {
7914 		s->first_displayed_entry = s->matched_entry;
7915 		s->selected = 0;
7916 	}
7917 
7918 	return NULL;
7919 }
7920 
7921 static const struct got_error *
7922 show_tree_view(struct tog_view *view)
7923 {
7924 	const struct got_error *err = NULL;
7925 	struct tog_tree_view_state *s = &view->state.tree;
7926 	char *parent_path;
7927 
7928 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7929 	if (err)
7930 		return err;
7931 
7932 	err = draw_tree_entries(view, parent_path);
7933 	free(parent_path);
7934 
7935 	view_border(view);
7936 	return err;
7937 }
7938 
7939 static const struct got_error *
7940 tree_goto_line(struct tog_view *view, int nlines)
7941 {
7942 	const struct got_error		 *err = NULL;
7943 	struct tog_tree_view_state	 *s = &view->state.tree;
7944 	struct got_tree_entry		**fte, **lte, **ste;
7945 	int				  g, last, first = 1, i = 1;
7946 	int				  root = s->tree == s->root;
7947 	int				  off = root ? 1 : 2;
7948 
7949 	g = view->gline;
7950 	view->gline = 0;
7951 
7952 	if (g == 0)
7953 		g = 1;
7954 	else if (g > got_object_tree_get_nentries(s->tree))
7955 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7956 
7957 	fte = &s->first_displayed_entry;
7958 	lte = &s->last_displayed_entry;
7959 	ste = &s->selected_entry;
7960 
7961 	if (*fte != NULL) {
7962 		first = got_tree_entry_get_index(*fte);
7963 		first += off;  /* account for ".." */
7964 	}
7965 	last = got_tree_entry_get_index(*lte);
7966 	last += off;
7967 
7968 	if (g >= first && g <= last && g - first < nlines) {
7969 		s->selected = g - first;
7970 		return NULL;	/* gline is on the current page */
7971 	}
7972 
7973 	if (*ste != NULL) {
7974 		i = got_tree_entry_get_index(*ste);
7975 		i += off;
7976 	}
7977 
7978 	if (i < g) {
7979 		err = tree_scroll_down(view, g - i);
7980 		if (err)
7981 			return err;
7982 		if (got_tree_entry_get_index(*lte) >=
7983 		    got_object_tree_get_nentries(s->tree) - 1 &&
7984 		    first + s->selected < g &&
7985 		    s->selected < s->ndisplayed - 1) {
7986 			first = got_tree_entry_get_index(*fte);
7987 			first += off;
7988 			s->selected = g - first;
7989 		}
7990 	} else if (i > g)
7991 		tree_scroll_up(s, i - g);
7992 
7993 	if (g < nlines &&
7994 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7995 		s->selected = g - 1;
7996 
7997 	return NULL;
7998 }
7999 
8000 static const struct got_error *
8001 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
8002 {
8003 	const struct got_error *err = NULL;
8004 	struct tog_tree_view_state *s = &view->state.tree;
8005 	struct got_tree_entry *te;
8006 	int n, nscroll = view->nlines - 3;
8007 
8008 	if (view->gline)
8009 		return tree_goto_line(view, nscroll);
8010 
8011 	switch (ch) {
8012 	case '0':
8013 	case '$':
8014 	case KEY_RIGHT:
8015 	case 'l':
8016 	case KEY_LEFT:
8017 	case 'h':
8018 		horizontal_scroll_input(view, ch);
8019 		break;
8020 	case 'i':
8021 		s->show_ids = !s->show_ids;
8022 		view->count = 0;
8023 		break;
8024 	case 'L':
8025 		view->count = 0;
8026 		if (!s->selected_entry)
8027 			break;
8028 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8029 		break;
8030 	case 'R':
8031 		view->count = 0;
8032 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8033 		break;
8034 	case 'g':
8035 	case '=':
8036 	case KEY_HOME:
8037 		s->selected = 0;
8038 		view->count = 0;
8039 		if (s->tree == s->root)
8040 			s->first_displayed_entry =
8041 			    got_object_tree_get_first_entry(s->tree);
8042 		else
8043 			s->first_displayed_entry = NULL;
8044 		break;
8045 	case 'G':
8046 	case '*':
8047 	case KEY_END: {
8048 		int eos = view->nlines - 3;
8049 
8050 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8051 			--eos;  /* border */
8052 		s->selected = 0;
8053 		view->count = 0;
8054 		te = got_object_tree_get_last_entry(s->tree);
8055 		for (n = 0; n < eos; n++) {
8056 			if (te == NULL) {
8057 				if (s->tree != s->root) {
8058 					s->first_displayed_entry = NULL;
8059 					n++;
8060 				}
8061 				break;
8062 			}
8063 			s->first_displayed_entry = te;
8064 			te = got_tree_entry_get_prev(s->tree, te);
8065 		}
8066 		if (n > 0)
8067 			s->selected = n - 1;
8068 		break;
8069 	}
8070 	case 'k':
8071 	case KEY_UP:
8072 	case CTRL('p'):
8073 		if (s->selected > 0) {
8074 			s->selected--;
8075 			break;
8076 		}
8077 		tree_scroll_up(s, 1);
8078 		if (s->selected_entry == NULL ||
8079 		    (s->tree == s->root && s->selected_entry ==
8080 		     got_object_tree_get_first_entry(s->tree)))