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