1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 	TOG_VIEW_HELP
107 };
108 
109 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
110 enum tog_keymap_type {
111 	TOG_KEYMAP_KEYS = -2,
112 	TOG_KEYMAP_GLOBAL,
113 	TOG_KEYMAP_DIFF,
114 	TOG_KEYMAP_LOG,
115 	TOG_KEYMAP_BLAME,
116 	TOG_KEYMAP_TREE,
117 	TOG_KEYMAP_REF,
118 	TOG_KEYMAP_HELP
119 };
120 
121 enum tog_view_mode {
122 	TOG_VIEW_SPLIT_NONE,
123 	TOG_VIEW_SPLIT_VERT,
124 	TOG_VIEW_SPLIT_HRZN
125 };
126 
127 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
128 
129 #define TOG_EOF_STRING	"(END)"
130 
131 struct commit_queue_entry {
132 	TAILQ_ENTRY(commit_queue_entry) entry;
133 	struct got_object_id *id;
134 	struct got_commit_object *commit;
135 	int idx;
136 };
137 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
138 struct commit_queue {
139 	int ncommits;
140 	struct commit_queue_head head;
141 };
142 
143 struct tog_color {
144 	STAILQ_ENTRY(tog_color) entry;
145 	regex_t regex;
146 	short colorpair;
147 };
148 STAILQ_HEAD(tog_colors, tog_color);
149 
150 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
151 static struct got_reflist_object_id_map *tog_refs_idmap;
152 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
153 
154 static const struct got_error *
155 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
156     struct got_reference* re2)
157 {
158 	const char *name1 = got_ref_get_name(re1);
159 	const char *name2 = got_ref_get_name(re2);
160 	int isbackup1, isbackup2;
161 
162 	/* Sort backup refs towards the bottom of the list. */
163 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
164 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
165 	if (!isbackup1 && isbackup2) {
166 		*cmp = -1;
167 		return NULL;
168 	} else if (isbackup1 && !isbackup2) {
169 		*cmp = 1;
170 		return NULL;
171 	}
172 
173 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 tog_load_refs(struct got_repository *repo, int sort_by_date)
179 {
180 	const struct got_error *err;
181 
182 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
183 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
184 	    repo);
185 	if (err)
186 		return err;
187 
188 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
189 	    repo);
190 }
191 
192 static void
193 tog_free_refs(void)
194 {
195 	if (tog_refs_idmap) {
196 		got_reflist_object_id_map_free(tog_refs_idmap);
197 		tog_refs_idmap = NULL;
198 	}
199 	got_ref_list_free(&tog_refs);
200 }
201 
202 static const struct got_error *
203 add_color(struct tog_colors *colors, const char *pattern,
204     int idx, short color)
205 {
206 	const struct got_error *err = NULL;
207 	struct tog_color *tc;
208 	int regerr = 0;
209 
210 	if (idx < 1 || idx > COLOR_PAIRS - 1)
211 		return NULL;
212 
213 	init_pair(idx, color, -1);
214 
215 	tc = calloc(1, sizeof(*tc));
216 	if (tc == NULL)
217 		return got_error_from_errno("calloc");
218 	regerr = regcomp(&tc->regex, pattern,
219 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
220 	if (regerr) {
221 		static char regerr_msg[512];
222 		static char err_msg[512];
223 		regerror(regerr, &tc->regex, regerr_msg,
224 		    sizeof(regerr_msg));
225 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
226 		    regerr_msg);
227 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
228 		free(tc);
229 		return err;
230 	}
231 	tc->colorpair = idx;
232 	STAILQ_INSERT_HEAD(colors, tc, entry);
233 	return NULL;
234 }
235 
236 static void
237 free_colors(struct tog_colors *colors)
238 {
239 	struct tog_color *tc;
240 
241 	while (!STAILQ_EMPTY(colors)) {
242 		tc = STAILQ_FIRST(colors);
243 		STAILQ_REMOVE_HEAD(colors, entry);
244 		regfree(&tc->regex);
245 		free(tc);
246 	}
247 }
248 
249 static struct tog_color *
250 get_color(struct tog_colors *colors, int colorpair)
251 {
252 	struct tog_color *tc = NULL;
253 
254 	STAILQ_FOREACH(tc, colors, entry) {
255 		if (tc->colorpair == colorpair)
256 			return tc;
257 	}
258 
259 	return NULL;
260 }
261 
262 static int
263 default_color_value(const char *envvar)
264 {
265 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
268 		return COLOR_CYAN;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
274 		return COLOR_MAGENTA;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
278 		return COLOR_CYAN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
286 		return COLOR_YELLOW;
287 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
290 		return COLOR_MAGENTA;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
294 		return COLOR_CYAN;
295 
296 	return -1;
297 }
298 
299 static int
300 get_color_value(const char *envvar)
301 {
302 	const char *val = getenv(envvar);
303 
304 	if (val == NULL)
305 		return default_color_value(envvar);
306 
307 	if (strcasecmp(val, "black") == 0)
308 		return COLOR_BLACK;
309 	if (strcasecmp(val, "red") == 0)
310 		return COLOR_RED;
311 	if (strcasecmp(val, "green") == 0)
312 		return COLOR_GREEN;
313 	if (strcasecmp(val, "yellow") == 0)
314 		return COLOR_YELLOW;
315 	if (strcasecmp(val, "blue") == 0)
316 		return COLOR_BLUE;
317 	if (strcasecmp(val, "magenta") == 0)
318 		return COLOR_MAGENTA;
319 	if (strcasecmp(val, "cyan") == 0)
320 		return COLOR_CYAN;
321 	if (strcasecmp(val, "white") == 0)
322 		return COLOR_WHITE;
323 	if (strcasecmp(val, "default") == 0)
324 		return -1;
325 
326 	return default_color_value(envvar);
327 }
328 
329 struct tog_diff_view_state {
330 	struct got_object_id *id1, *id2;
331 	const char *label1, *label2;
332 	FILE *f, *f1, *f2;
333 	int fd1, fd2;
334 	int lineno;
335 	int first_displayed_line;
336 	int last_displayed_line;
337 	int eof;
338 	int diff_context;
339 	int ignore_whitespace;
340 	int force_text_diff;
341 	struct got_repository *repo;
342 	struct got_diff_line *lines;
343 	size_t nlines;
344 	int matched_line;
345 	int selected_line;
346 
347 	/* passed from log or blame view; may be NULL */
348 	struct tog_view *parent_view;
349 };
350 
351 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
352 static volatile sig_atomic_t tog_thread_error;
353 
354 struct tog_log_thread_args {
355 	pthread_cond_t need_commits;
356 	pthread_cond_t commit_loaded;
357 	int commits_needed;
358 	int load_all;
359 	struct got_commit_graph *graph;
360 	struct commit_queue *real_commits;
361 	const char *in_repo_path;
362 	struct got_object_id *start_id;
363 	struct got_repository *repo;
364 	int *pack_fds;
365 	int log_complete;
366 	sig_atomic_t *quit;
367 	struct commit_queue_entry **first_displayed_entry;
368 	struct commit_queue_entry **selected_entry;
369 	int *searching;
370 	int *search_next_done;
371 	regex_t *regex;
372 	int *limiting;
373 	int limit_match;
374 	regex_t *limit_regex;
375 	struct commit_queue *limit_commits;
376 };
377 
378 struct tog_log_view_state {
379 	struct commit_queue *commits;
380 	struct commit_queue_entry *first_displayed_entry;
381 	struct commit_queue_entry *last_displayed_entry;
382 	struct commit_queue_entry *selected_entry;
383 	struct commit_queue real_commits;
384 	int selected;
385 	char *in_repo_path;
386 	char *head_ref_name;
387 	int log_branches;
388 	struct got_repository *repo;
389 	struct got_object_id *start_id;
390 	sig_atomic_t quit;
391 	pthread_t thread;
392 	struct tog_log_thread_args thread_args;
393 	struct commit_queue_entry *matched_entry;
394 	struct commit_queue_entry *search_entry;
395 	struct tog_colors colors;
396 	int use_committer;
397 	int limit_view;
398 	regex_t limit_regex;
399 	struct commit_queue limit_commits;
400 };
401 
402 #define TOG_COLOR_DIFF_MINUS		1
403 #define TOG_COLOR_DIFF_PLUS		2
404 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
405 #define TOG_COLOR_DIFF_META		4
406 #define TOG_COLOR_TREE_SUBMODULE	5
407 #define TOG_COLOR_TREE_SYMLINK		6
408 #define TOG_COLOR_TREE_DIRECTORY	7
409 #define TOG_COLOR_TREE_EXECUTABLE	8
410 #define TOG_COLOR_COMMIT		9
411 #define TOG_COLOR_AUTHOR		10
412 #define TOG_COLOR_DATE			11
413 #define TOG_COLOR_REFS_HEADS		12
414 #define TOG_COLOR_REFS_TAGS		13
415 #define TOG_COLOR_REFS_REMOTES		14
416 #define TOG_COLOR_REFS_BACKUP		15
417 
418 struct tog_blame_cb_args {
419 	struct tog_blame_line *lines; /* one per line */
420 	int nlines;
421 
422 	struct tog_view *view;
423 	struct got_object_id *commit_id;
424 	int *quit;
425 };
426 
427 struct tog_blame_thread_args {
428 	const char *path;
429 	struct got_repository *repo;
430 	struct tog_blame_cb_args *cb_args;
431 	int *complete;
432 	got_cancel_cb cancel_cb;
433 	void *cancel_arg;
434 };
435 
436 struct tog_blame {
437 	FILE *f;
438 	off_t filesize;
439 	struct tog_blame_line *lines;
440 	int nlines;
441 	off_t *line_offsets;
442 	pthread_t thread;
443 	struct tog_blame_thread_args thread_args;
444 	struct tog_blame_cb_args cb_args;
445 	const char *path;
446 	int *pack_fds;
447 };
448 
449 struct tog_blame_view_state {
450 	int first_displayed_line;
451 	int last_displayed_line;
452 	int selected_line;
453 	int last_diffed_line;
454 	int blame_complete;
455 	int eof;
456 	int done;
457 	struct got_object_id_queue blamed_commits;
458 	struct got_object_qid *blamed_commit;
459 	char *path;
460 	struct got_repository *repo;
461 	struct got_object_id *commit_id;
462 	struct got_object_id *id_to_log;
463 	struct tog_blame blame;
464 	int matched_line;
465 	struct tog_colors colors;
466 };
467 
468 struct tog_parent_tree {
469 	TAILQ_ENTRY(tog_parent_tree) entry;
470 	struct got_tree_object *tree;
471 	struct got_tree_entry *first_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int selected;
474 };
475 
476 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
477 
478 struct tog_tree_view_state {
479 	char *tree_label;
480 	struct got_object_id *commit_id;/* commit which this tree belongs to */
481 	struct got_tree_object *root;	/* the commit's root tree entry */
482 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
483 	struct got_tree_entry *first_displayed_entry;
484 	struct got_tree_entry *last_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int ndisplayed, selected, show_ids;
487 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
488 	char *head_ref_name;
489 	struct got_repository *repo;
490 	struct got_tree_entry *matched_entry;
491 	struct tog_colors colors;
492 };
493 
494 struct tog_reflist_entry {
495 	TAILQ_ENTRY(tog_reflist_entry) entry;
496 	struct got_reference *ref;
497 	int idx;
498 };
499 
500 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
501 
502 struct tog_ref_view_state {
503 	struct tog_reflist_head refs;
504 	struct tog_reflist_entry *first_displayed_entry;
505 	struct tog_reflist_entry *last_displayed_entry;
506 	struct tog_reflist_entry *selected_entry;
507 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
508 	struct got_repository *repo;
509 	struct tog_reflist_entry *matched_entry;
510 	struct tog_colors colors;
511 };
512 
513 struct tog_help_view_state {
514 	FILE			*f;
515 	off_t			*line_offsets;
516 	size_t			 nlines;
517 	int			 lineno;
518 	int			 first_displayed_line;
519 	int			 last_displayed_line;
520 	int			 eof;
521 	int			 matched_line;
522 	int			 selected_line;
523 	int			 all;
524 	enum tog_keymap_type	 type;
525 };
526 
527 #define GENERATE_HELP \
528 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
529 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
530 	KEY_("k C-p Up", "Move cursor or page up one line"), \
531 	KEY_("j C-n Down", "Move cursor or page down one line"), \
532 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
533 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
534 	KEY_("C-u u", "Scroll the view up one half page"), \
535 	KEY_("C-d d", "Scroll the view down one half page"), \
536 	KEY_("g", "Go to line N (default: first line)"), \
537 	KEY_("Home =", "Go to the first line"), \
538 	KEY_("G", "Go to line N (default: last line)"), \
539 	KEY_("End *", "Go to the last line"), \
540 	KEY_("l Right", "Scroll the view right"), \
541 	KEY_("h Left", "Scroll the view left"), \
542 	KEY_("$", "Scroll view to the rightmost position"), \
543 	KEY_("0", "Scroll view to the leftmost position"), \
544 	KEY_("-", "Decrease size of the focussed split"), \
545 	KEY_("+", "Increase size of the focussed split"), \
546 	KEY_("Tab", "Switch focus between views"), \
547 	KEY_("F", "Toggle fullscreen mode"), \
548 	KEY_("/", "Open prompt to enter search term"), \
549 	KEY_("n", "Find next line/token matching the current search term"), \
550 	KEY_("N", "Find previous line/token matching the current search term"),\
551 	KEY_("q", "Quit the focussed view; Quit help screen"), \
552 	KEY_("Q", "Quit tog"), \
553 	\
554 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
555 	KEY_("< ,", "Move cursor up one commit"), \
556 	KEY_("> .", "Move cursor down one commit"), \
557 	KEY_("Enter", "Open diff view of the selected commit"), \
558 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
559 	KEY_("R", "Open ref view of all repository references"), \
560 	KEY_("T", "Display tree view of the repository from the selected" \
561 	    " commit"), \
562 	KEY_("@", "Toggle between displaying author and committer name"), \
563 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
564 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
565 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
566 	\
567 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
568 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
569 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
570 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
571 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
572 	    " data"), \
573 	KEY_("(", "Go to the previous file in the diff"), \
574 	KEY_(")", "Go to the next file in the diff"), \
575 	KEY_("{", "Go to the previous hunk in the diff"), \
576 	KEY_("}", "Go to the next hunk in the diff"), \
577 	KEY_("[", "Decrease the number of context lines"), \
578 	KEY_("]", "Increase the number of context lines"), \
579 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
580 	\
581 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
582 	KEY_("Enter", "Display diff view of the selected line's commit"), \
583 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
584 	KEY_("L", "Open log view for the currently selected annotated line"), \
585 	KEY_("C", "Reload view with the previously blamed commit"), \
586 	KEY_("c", "Reload view with the version of the file found in the" \
587 	    " selected line's commit"), \
588 	KEY_("p", "Reload view with the version of the file found in the" \
589 	    " selected line's parent commit"), \
590 	\
591 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
592 	KEY_("Enter", "Enter selected directory or open blame view of the" \
593 	    " selected file"), \
594 	KEY_("L", "Open log view for the selected entry"), \
595 	KEY_("R", "Open ref view of all repository references"), \
596 	KEY_("i", "Show object IDs for all tree entries"), \
597 	KEY_("Backspace", "Return to the parent directory"), \
598 	\
599 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
600 	KEY_("Enter", "Display log view of the selected reference"), \
601 	KEY_("T", "Display tree view of the selected reference"), \
602 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
603 	KEY_("m", "Toggle display of last modified date for each reference"), \
604 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
605 	KEY_("C-l", "Reload view with all repository references")
606 
607 struct tog_key_map {
608 	const char		*keys;
609 	const char		*info;
610 	enum tog_keymap_type	 type;
611 };
612 
613 /*
614  * We implement two types of views: parent views and child views.
615  *
616  * The 'Tab' key switches focus between a parent view and its child view.
617  * Child views are shown side-by-side to their parent view, provided
618  * there is enough screen estate.
619  *
620  * When a new view is opened from within a parent view, this new view
621  * becomes a child view of the parent view, replacing any existing child.
622  *
623  * When a new view is opened from within a child view, this new view
624  * becomes a parent view which will obscure the views below until the
625  * user quits the new parent view by typing 'q'.
626  *
627  * This list of views contains parent views only.
628  * Child views are only pointed to by their parent view.
629  */
630 TAILQ_HEAD(tog_view_list_head, tog_view);
631 
632 struct tog_view {
633 	TAILQ_ENTRY(tog_view) entry;
634 	WINDOW *window;
635 	PANEL *panel;
636 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
637 	int resized_y, resized_x; /* begin_y/x based on user resizing */
638 	int maxx, x; /* max column and current start column */
639 	int lines, cols; /* copies of LINES and COLS */
640 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
641 	int gline, hiline; /* navigate to and highlight this nG line */
642 	int ch, count; /* current keymap and count prefix */
643 	int resized; /* set when in a resize event */
644 	int focussed; /* Only set on one parent or child view at a time. */
645 	int dying;
646 	struct tog_view *parent;
647 	struct tog_view *child;
648 
649 	/*
650 	 * This flag is initially set on parent views when a new child view
651 	 * is created. It gets toggled when the 'Tab' key switches focus
652 	 * between parent and child.
653 	 * The flag indicates whether focus should be passed on to our child
654 	 * view if this parent view gets picked for focus after another parent
655 	 * view was closed. This prevents child views from losing focus in such
656 	 * situations.
657 	 */
658 	int focus_child;
659 
660 	enum tog_view_mode mode;
661 	/* type-specific state */
662 	enum tog_view_type type;
663 	union {
664 		struct tog_diff_view_state diff;
665 		struct tog_log_view_state log;
666 		struct tog_blame_view_state blame;
667 		struct tog_tree_view_state tree;
668 		struct tog_ref_view_state ref;
669 		struct tog_help_view_state help;
670 	} state;
671 
672 	const struct got_error *(*show)(struct tog_view *);
673 	const struct got_error *(*input)(struct tog_view **,
674 	    struct tog_view *, int);
675 	const struct got_error *(*reset)(struct tog_view *);
676 	const struct got_error *(*resize)(struct tog_view *, int);
677 	const struct got_error *(*close)(struct tog_view *);
678 
679 	const struct got_error *(*search_start)(struct tog_view *);
680 	const struct got_error *(*search_next)(struct tog_view *);
681 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
682 	    int **, int **, int **, int **);
683 	int search_started;
684 	int searching;
685 #define TOG_SEARCH_FORWARD	1
686 #define TOG_SEARCH_BACKWARD	2
687 	int search_next_done;
688 #define TOG_SEARCH_HAVE_MORE	1
689 #define TOG_SEARCH_NO_MORE	2
690 #define TOG_SEARCH_HAVE_NONE	3
691 	regex_t regex;
692 	regmatch_t regmatch;
693 };
694 
695 static const struct got_error *open_diff_view(struct tog_view *,
696     struct got_object_id *, struct got_object_id *,
697     const char *, const char *, int, int, int, struct tog_view *,
698     struct got_repository *);
699 static const struct got_error *show_diff_view(struct tog_view *);
700 static const struct got_error *input_diff_view(struct tog_view **,
701     struct tog_view *, int);
702 static const struct got_error *reset_diff_view(struct tog_view *);
703 static const struct got_error* close_diff_view(struct tog_view *);
704 static const struct got_error *search_start_diff_view(struct tog_view *);
705 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
706     size_t *, int **, int **, int **, int **);
707 static const struct got_error *search_next_view_match(struct tog_view *);
708 
709 static const struct got_error *open_log_view(struct tog_view *,
710     struct got_object_id *, struct got_repository *,
711     const char *, const char *, int);
712 static const struct got_error * show_log_view(struct tog_view *);
713 static const struct got_error *input_log_view(struct tog_view **,
714     struct tog_view *, int);
715 static const struct got_error *resize_log_view(struct tog_view *, int);
716 static const struct got_error *close_log_view(struct tog_view *);
717 static const struct got_error *search_start_log_view(struct tog_view *);
718 static const struct got_error *search_next_log_view(struct tog_view *);
719 
720 static const struct got_error *open_blame_view(struct tog_view *, char *,
721     struct got_object_id *, struct got_repository *);
722 static const struct got_error *show_blame_view(struct tog_view *);
723 static const struct got_error *input_blame_view(struct tog_view **,
724     struct tog_view *, int);
725 static const struct got_error *reset_blame_view(struct tog_view *);
726 static const struct got_error *close_blame_view(struct tog_view *);
727 static const struct got_error *search_start_blame_view(struct tog_view *);
728 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
729     size_t *, int **, int **, int **, int **);
730 
731 static const struct got_error *open_tree_view(struct tog_view *,
732     struct got_object_id *, const char *, struct got_repository *);
733 static const struct got_error *show_tree_view(struct tog_view *);
734 static const struct got_error *input_tree_view(struct tog_view **,
735     struct tog_view *, int);
736 static const struct got_error *close_tree_view(struct tog_view *);
737 static const struct got_error *search_start_tree_view(struct tog_view *);
738 static const struct got_error *search_next_tree_view(struct tog_view *);
739 
740 static const struct got_error *open_ref_view(struct tog_view *,
741     struct got_repository *);
742 static const struct got_error *show_ref_view(struct tog_view *);
743 static const struct got_error *input_ref_view(struct tog_view **,
744     struct tog_view *, int);
745 static const struct got_error *close_ref_view(struct tog_view *);
746 static const struct got_error *search_start_ref_view(struct tog_view *);
747 static const struct got_error *search_next_ref_view(struct tog_view *);
748 
749 static const struct got_error *open_help_view(struct tog_view *,
750     struct tog_view *);
751 static const struct got_error *show_help_view(struct tog_view *);
752 static const struct got_error *input_help_view(struct tog_view **,
753     struct tog_view *, int);
754 static const struct got_error *reset_help_view(struct tog_view *);
755 static const struct got_error* close_help_view(struct tog_view *);
756 static const struct got_error *search_start_help_view(struct tog_view *);
757 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
758     size_t *, int **, int **, int **, int **);
759 
760 static volatile sig_atomic_t tog_sigwinch_received;
761 static volatile sig_atomic_t tog_sigpipe_received;
762 static volatile sig_atomic_t tog_sigcont_received;
763 static volatile sig_atomic_t tog_sigint_received;
764 static volatile sig_atomic_t tog_sigterm_received;
765 
766 static void
767 tog_sigwinch(int signo)
768 {
769 	tog_sigwinch_received = 1;
770 }
771 
772 static void
773 tog_sigpipe(int signo)
774 {
775 	tog_sigpipe_received = 1;
776 }
777 
778 static void
779 tog_sigcont(int signo)
780 {
781 	tog_sigcont_received = 1;
782 }
783 
784 static void
785 tog_sigint(int signo)
786 {
787 	tog_sigint_received = 1;
788 }
789 
790 static void
791 tog_sigterm(int signo)
792 {
793 	tog_sigterm_received = 1;
794 }
795 
796 static int
797 tog_fatal_signal_received(void)
798 {
799 	return (tog_sigpipe_received ||
800 	    tog_sigint_received || tog_sigterm_received);
801 }
802 
803 static const struct got_error *
804 view_close(struct tog_view *view)
805 {
806 	const struct got_error *err = NULL, *child_err = NULL;
807 
808 	if (view->child) {
809 		child_err = view_close(view->child);
810 		view->child = NULL;
811 	}
812 	if (view->close)
813 		err = view->close(view);
814 	if (view->panel)
815 		del_panel(view->panel);
816 	if (view->window)
817 		delwin(view->window);
818 	free(view);
819 	return err ? err : child_err;
820 }
821 
822 static struct tog_view *
823 view_open(int nlines, int ncols, int begin_y, int begin_x,
824     enum tog_view_type type)
825 {
826 	struct tog_view *view = calloc(1, sizeof(*view));
827 
828 	if (view == NULL)
829 		return NULL;
830 
831 	view->type = type;
832 	view->lines = LINES;
833 	view->cols = COLS;
834 	view->nlines = nlines ? nlines : LINES - begin_y;
835 	view->ncols = ncols ? ncols : COLS - begin_x;
836 	view->begin_y = begin_y;
837 	view->begin_x = begin_x;
838 	view->window = newwin(nlines, ncols, begin_y, begin_x);
839 	if (view->window == NULL) {
840 		view_close(view);
841 		return NULL;
842 	}
843 	view->panel = new_panel(view->window);
844 	if (view->panel == NULL ||
845 	    set_panel_userptr(view->panel, view) != OK) {
846 		view_close(view);
847 		return NULL;
848 	}
849 
850 	keypad(view->window, TRUE);
851 	return view;
852 }
853 
854 static int
855 view_split_begin_x(int begin_x)
856 {
857 	if (begin_x > 0 || COLS < 120)
858 		return 0;
859 	return (COLS - MAX(COLS / 2, 80));
860 }
861 
862 /* XXX Stub till we decide what to do. */
863 static int
864 view_split_begin_y(int lines)
865 {
866 	return lines * HSPLIT_SCALE;
867 }
868 
869 static const struct got_error *view_resize(struct tog_view *);
870 
871 static const struct got_error *
872 view_splitscreen(struct tog_view *view)
873 {
874 	const struct got_error *err = NULL;
875 
876 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
877 		if (view->resized_y && view->resized_y < view->lines)
878 			view->begin_y = view->resized_y;
879 		else
880 			view->begin_y = view_split_begin_y(view->nlines);
881 		view->begin_x = 0;
882 	} else if (!view->resized) {
883 		if (view->resized_x && view->resized_x < view->cols - 1 &&
884 		    view->cols > 119)
885 			view->begin_x = view->resized_x;
886 		else
887 			view->begin_x = view_split_begin_x(0);
888 		view->begin_y = 0;
889 	}
890 	view->nlines = LINES - view->begin_y;
891 	view->ncols = COLS - view->begin_x;
892 	view->lines = LINES;
893 	view->cols = COLS;
894 	err = view_resize(view);
895 	if (err)
896 		return err;
897 
898 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
899 		view->parent->nlines = view->begin_y;
900 
901 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
902 		return got_error_from_errno("mvwin");
903 
904 	return NULL;
905 }
906 
907 static const struct got_error *
908 view_fullscreen(struct tog_view *view)
909 {
910 	const struct got_error *err = NULL;
911 
912 	view->begin_x = 0;
913 	view->begin_y = view->resized ? view->begin_y : 0;
914 	view->nlines = view->resized ? view->nlines : LINES;
915 	view->ncols = COLS;
916 	view->lines = LINES;
917 	view->cols = COLS;
918 	err = view_resize(view);
919 	if (err)
920 		return err;
921 
922 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
923 		return got_error_from_errno("mvwin");
924 
925 	return NULL;
926 }
927 
928 static int
929 view_is_parent_view(struct tog_view *view)
930 {
931 	return view->parent == NULL;
932 }
933 
934 static int
935 view_is_splitscreen(struct tog_view *view)
936 {
937 	return view->begin_x > 0 || view->begin_y > 0;
938 }
939 
940 static int
941 view_is_fullscreen(struct tog_view *view)
942 {
943 	return view->nlines == LINES && view->ncols == COLS;
944 }
945 
946 static int
947 view_is_hsplit_top(struct tog_view *view)
948 {
949 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
950 	    view_is_splitscreen(view->child);
951 }
952 
953 static void
954 view_border(struct tog_view *view)
955 {
956 	PANEL *panel;
957 	const struct tog_view *view_above;
958 
959 	if (view->parent)
960 		return view_border(view->parent);
961 
962 	panel = panel_above(view->panel);
963 	if (panel == NULL)
964 		return;
965 
966 	view_above = panel_userptr(panel);
967 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
968 		mvwhline(view->window, view_above->begin_y - 1,
969 		    view->begin_x, got_locale_is_utf8() ?
970 		    ACS_HLINE : '-', view->ncols);
971 	else
972 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
973 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
974 }
975 
976 static const struct got_error *view_init_hsplit(struct tog_view *, int);
977 static const struct got_error *request_log_commits(struct tog_view *);
978 static const struct got_error *offset_selection_down(struct tog_view *);
979 static void offset_selection_up(struct tog_view *);
980 static void view_get_split(struct tog_view *, int *, int *);
981 
982 static const struct got_error *
983 view_resize(struct tog_view *view)
984 {
985 	const struct got_error	*err = NULL;
986 	int			 dif, nlines, ncols;
987 
988 	dif = LINES - view->lines;  /* line difference */
989 
990 	if (view->lines > LINES)
991 		nlines = view->nlines - (view->lines - LINES);
992 	else
993 		nlines = view->nlines + (LINES - view->lines);
994 	if (view->cols > COLS)
995 		ncols = view->ncols - (view->cols - COLS);
996 	else
997 		ncols = view->ncols + (COLS - view->cols);
998 
999 	if (view->child) {
1000 		int hs = view->child->begin_y;
1001 
1002 		if (!view_is_fullscreen(view))
1003 			view->child->begin_x = view_split_begin_x(view->begin_x);
1004 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1005 		    view->child->begin_x == 0) {
1006 			ncols = COLS;
1007 
1008 			view_fullscreen(view->child);
1009 			if (view->child->focussed)
1010 				show_panel(view->child->panel);
1011 			else
1012 				show_panel(view->panel);
1013 		} else {
1014 			ncols = view->child->begin_x;
1015 
1016 			view_splitscreen(view->child);
1017 			show_panel(view->child->panel);
1018 		}
1019 		/*
1020 		 * XXX This is ugly and needs to be moved into the above
1021 		 * logic but "works" for now and my attempts at moving it
1022 		 * break either 'tab' or 'F' key maps in horizontal splits.
1023 		 */
1024 		if (hs) {
1025 			err = view_splitscreen(view->child);
1026 			if (err)
1027 				return err;
1028 			if (dif < 0) { /* top split decreased */
1029 				err = offset_selection_down(view);
1030 				if (err)
1031 					return err;
1032 			}
1033 			view_border(view);
1034 			update_panels();
1035 			doupdate();
1036 			show_panel(view->child->panel);
1037 			nlines = view->nlines;
1038 		}
1039 	} else if (view->parent == NULL)
1040 		ncols = COLS;
1041 
1042 	if (view->resize && dif > 0) {
1043 		err = view->resize(view, dif);
1044 		if (err)
1045 			return err;
1046 	}
1047 
1048 	if (wresize(view->window, nlines, ncols) == ERR)
1049 		return got_error_from_errno("wresize");
1050 	if (replace_panel(view->panel, view->window) == ERR)
1051 		return got_error_from_errno("replace_panel");
1052 	wclear(view->window);
1053 
1054 	view->nlines = nlines;
1055 	view->ncols = ncols;
1056 	view->lines = LINES;
1057 	view->cols = COLS;
1058 
1059 	return NULL;
1060 }
1061 
1062 static const struct got_error *
1063 resize_log_view(struct tog_view *view, int increase)
1064 {
1065 	struct tog_log_view_state	*s = &view->state.log;
1066 	const struct got_error		*err = NULL;
1067 	int				 n = 0;
1068 
1069 	if (s->selected_entry)
1070 		n = s->selected_entry->idx + view->lines - s->selected;
1071 
1072 	/*
1073 	 * Request commits to account for the increased
1074 	 * height so we have enough to populate the view.
1075 	 */
1076 	if (s->commits->ncommits < n) {
1077 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1078 		err = request_log_commits(view);
1079 	}
1080 
1081 	return err;
1082 }
1083 
1084 static void
1085 view_adjust_offset(struct tog_view *view, int n)
1086 {
1087 	if (n == 0)
1088 		return;
1089 
1090 	if (view->parent && view->parent->offset) {
1091 		if (view->parent->offset + n >= 0)
1092 			view->parent->offset += n;
1093 		else
1094 			view->parent->offset = 0;
1095 	} else if (view->offset) {
1096 		if (view->offset - n >= 0)
1097 			view->offset -= n;
1098 		else
1099 			view->offset = 0;
1100 	}
1101 }
1102 
1103 static const struct got_error *
1104 view_resize_split(struct tog_view *view, int resize)
1105 {
1106 	const struct got_error	*err = NULL;
1107 	struct tog_view		*v = NULL;
1108 
1109 	if (view->parent)
1110 		v = view->parent;
1111 	else
1112 		v = view;
1113 
1114 	if (!v->child || !view_is_splitscreen(v->child))
1115 		return NULL;
1116 
1117 	v->resized = v->child->resized = resize;  /* lock for resize event */
1118 
1119 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1120 		if (v->child->resized_y)
1121 			v->child->begin_y = v->child->resized_y;
1122 		if (view->parent)
1123 			v->child->begin_y -= resize;
1124 		else
1125 			v->child->begin_y += resize;
1126 		if (v->child->begin_y < 3) {
1127 			view->count = 0;
1128 			v->child->begin_y = 3;
1129 		} else if (v->child->begin_y > LINES - 1) {
1130 			view->count = 0;
1131 			v->child->begin_y = LINES - 1;
1132 		}
1133 		v->ncols = COLS;
1134 		v->child->ncols = COLS;
1135 		view_adjust_offset(view, resize);
1136 		err = view_init_hsplit(v, v->child->begin_y);
1137 		if (err)
1138 			return err;
1139 		v->child->resized_y = v->child->begin_y;
1140 	} else {
1141 		if (v->child->resized_x)
1142 			v->child->begin_x = v->child->resized_x;
1143 		if (view->parent)
1144 			v->child->begin_x -= resize;
1145 		else
1146 			v->child->begin_x += resize;
1147 		if (v->child->begin_x < 11) {
1148 			view->count = 0;
1149 			v->child->begin_x = 11;
1150 		} else if (v->child->begin_x > COLS - 1) {
1151 			view->count = 0;
1152 			v->child->begin_x = COLS - 1;
1153 		}
1154 		v->child->resized_x = v->child->begin_x;
1155 	}
1156 
1157 	v->child->mode = v->mode;
1158 	v->child->nlines = v->lines - v->child->begin_y;
1159 	v->child->ncols = v->cols - v->child->begin_x;
1160 	v->focus_child = 1;
1161 
1162 	err = view_fullscreen(v);
1163 	if (err)
1164 		return err;
1165 	err = view_splitscreen(v->child);
1166 	if (err)
1167 		return err;
1168 
1169 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1170 		err = offset_selection_down(v->child);
1171 		if (err)
1172 			return err;
1173 	}
1174 
1175 	if (v->resize)
1176 		err = v->resize(v, 0);
1177 	else if (v->child->resize)
1178 		err = v->child->resize(v->child, 0);
1179 
1180 	v->resized = v->child->resized = 0;
1181 
1182 	return err;
1183 }
1184 
1185 static void
1186 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1187 {
1188 	struct tog_view *v = src->child ? src->child : src;
1189 
1190 	dst->resized_x = v->resized_x;
1191 	dst->resized_y = v->resized_y;
1192 }
1193 
1194 static const struct got_error *
1195 view_close_child(struct tog_view *view)
1196 {
1197 	const struct got_error *err = NULL;
1198 
1199 	if (view->child == NULL)
1200 		return NULL;
1201 
1202 	err = view_close(view->child);
1203 	view->child = NULL;
1204 	return err;
1205 }
1206 
1207 static const struct got_error *
1208 view_set_child(struct tog_view *view, struct tog_view *child)
1209 {
1210 	const struct got_error *err = NULL;
1211 
1212 	view->child = child;
1213 	child->parent = view;
1214 
1215 	err = view_resize(view);
1216 	if (err)
1217 		return err;
1218 
1219 	if (view->child->resized_x || view->child->resized_y)
1220 		err = view_resize_split(view, 0);
1221 
1222 	return err;
1223 }
1224 
1225 static const struct got_error *view_dispatch_request(struct tog_view **,
1226     struct tog_view *, enum tog_view_type, int, int);
1227 
1228 static const struct got_error *
1229 view_request_new(struct tog_view **requested, struct tog_view *view,
1230     enum tog_view_type request)
1231 {
1232 	struct tog_view		*new_view = NULL;
1233 	const struct got_error	*err;
1234 	int			 y = 0, x = 0;
1235 
1236 	*requested = NULL;
1237 
1238 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1239 		view_get_split(view, &y, &x);
1240 
1241 	err = view_dispatch_request(&new_view, view, request, y, x);
1242 	if (err)
1243 		return err;
1244 
1245 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1246 	    request != TOG_VIEW_HELP) {
1247 		err = view_init_hsplit(view, y);
1248 		if (err)
1249 			return err;
1250 	}
1251 
1252 	view->focussed = 0;
1253 	new_view->focussed = 1;
1254 	new_view->mode = view->mode;
1255 	new_view->nlines = request == TOG_VIEW_HELP ?
1256 	    view->lines : view->lines - y;
1257 
1258 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1259 		view_transfer_size(new_view, view);
1260 		err = view_close_child(view);
1261 		if (err)
1262 			return err;
1263 		err = view_set_child(view, new_view);
1264 		if (err)
1265 			return err;
1266 		view->focus_child = 1;
1267 	} else
1268 		*requested = new_view;
1269 
1270 	return NULL;
1271 }
1272 
1273 static void
1274 tog_resizeterm(void)
1275 {
1276 	int cols, lines;
1277 	struct winsize size;
1278 
1279 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1280 		cols = 80;     /* Default */
1281 		lines = 24;
1282 	} else {
1283 		cols = size.ws_col;
1284 		lines = size.ws_row;
1285 	}
1286 	resize_term(lines, cols);
1287 }
1288 
1289 static const struct got_error *
1290 view_search_start(struct tog_view *view)
1291 {
1292 	const struct got_error *err = NULL;
1293 	struct tog_view *v = view;
1294 	char pattern[1024];
1295 	int ret;
1296 
1297 	if (view->search_started) {
1298 		regfree(&view->regex);
1299 		view->searching = 0;
1300 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1301 	}
1302 	view->search_started = 0;
1303 
1304 	if (view->nlines < 1)
1305 		return NULL;
1306 
1307 	if (view_is_hsplit_top(view))
1308 		v = view->child;
1309 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1310 		v = view->parent;
1311 
1312 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1313 	wclrtoeol(v->window);
1314 
1315 	nodelay(v->window, FALSE);  /* block for search term input */
1316 	nocbreak();
1317 	echo();
1318 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1319 	wrefresh(v->window);
1320 	cbreak();
1321 	noecho();
1322 	nodelay(v->window, TRUE);
1323 	if (ret == ERR)
1324 		return NULL;
1325 
1326 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1327 		err = view->search_start(view);
1328 		if (err) {
1329 			regfree(&view->regex);
1330 			return err;
1331 		}
1332 		view->search_started = 1;
1333 		view->searching = TOG_SEARCH_FORWARD;
1334 		view->search_next_done = 0;
1335 		view->search_next(view);
1336 	}
1337 
1338 	return NULL;
1339 }
1340 
1341 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1342 static const struct got_error *
1343 switch_split(struct tog_view *view)
1344 {
1345 	const struct got_error	*err = NULL;
1346 	struct tog_view		*v = NULL;
1347 
1348 	if (view->parent)
1349 		v = view->parent;
1350 	else
1351 		v = view;
1352 
1353 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1354 		v->mode = TOG_VIEW_SPLIT_VERT;
1355 	else
1356 		v->mode = TOG_VIEW_SPLIT_HRZN;
1357 
1358 	if (!v->child)
1359 		return NULL;
1360 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1361 		v->mode = TOG_VIEW_SPLIT_NONE;
1362 
1363 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1364 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1365 		v->child->begin_y = v->child->resized_y;
1366 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1367 		v->child->begin_x = v->child->resized_x;
1368 
1369 
1370 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1371 		v->ncols = COLS;
1372 		v->child->ncols = COLS;
1373 		v->child->nscrolled = LINES - v->child->nlines;
1374 
1375 		err = view_init_hsplit(v, v->child->begin_y);
1376 		if (err)
1377 			return err;
1378 	}
1379 	v->child->mode = v->mode;
1380 	v->child->nlines = v->lines - v->child->begin_y;
1381 	v->focus_child = 1;
1382 
1383 	err = view_fullscreen(v);
1384 	if (err)
1385 		return err;
1386 	err = view_splitscreen(v->child);
1387 	if (err)
1388 		return err;
1389 
1390 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1391 		v->mode = TOG_VIEW_SPLIT_VERT;
1392 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1393 		err = offset_selection_down(v);
1394 		if (err)
1395 			return err;
1396 		err = offset_selection_down(v->child);
1397 		if (err)
1398 			return err;
1399 	} else {
1400 		offset_selection_up(v);
1401 		offset_selection_up(v->child);
1402 	}
1403 	if (v->resize)
1404 		err = v->resize(v, 0);
1405 	else if (v->child->resize)
1406 		err = v->child->resize(v->child, 0);
1407 
1408 	return err;
1409 }
1410 
1411 /*
1412  * Compute view->count from numeric input. Assign total to view->count and
1413  * return first non-numeric key entered.
1414  */
1415 static int
1416 get_compound_key(struct tog_view *view, int c)
1417 {
1418 	struct tog_view	*v = view;
1419 	int		 x, n = 0;
1420 
1421 	if (view_is_hsplit_top(view))
1422 		v = view->child;
1423 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1424 		v = view->parent;
1425 
1426 	view->count = 0;
1427 	cbreak();  /* block for input */
1428 	nodelay(view->window, FALSE);
1429 	wmove(v->window, v->nlines - 1, 0);
1430 	wclrtoeol(v->window);
1431 	waddch(v->window, ':');
1432 
1433 	do {
1434 		x = getcurx(v->window);
1435 		if (x != ERR && x < view->ncols) {
1436 			waddch(v->window, c);
1437 			wrefresh(v->window);
1438 		}
1439 
1440 		/*
1441 		 * Don't overflow. Max valid request should be the greatest
1442 		 * between the longest and total lines; cap at 10 million.
1443 		 */
1444 		if (n >= 9999999)
1445 			n = 9999999;
1446 		else
1447 			n = n * 10 + (c - '0');
1448 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1449 
1450 	if (c == 'G' || c == 'g') {	/* nG key map */
1451 		view->gline = view->hiline = n;
1452 		n = 0;
1453 		c = 0;
1454 	}
1455 
1456 	/* Massage excessive or inapplicable values at the input handler. */
1457 	view->count = n;
1458 
1459 	return c;
1460 }
1461 
1462 static const struct got_error *
1463 view_input(struct tog_view **new, int *done, struct tog_view *view,
1464     struct tog_view_list_head *views)
1465 {
1466 	const struct got_error *err = NULL;
1467 	struct tog_view *v;
1468 	int ch, errcode;
1469 
1470 	*new = NULL;
1471 
1472 	/* Clear "no matches" indicator. */
1473 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1474 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1475 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1476 		view->count = 0;
1477 	}
1478 
1479 	if (view->searching && !view->search_next_done) {
1480 		errcode = pthread_mutex_unlock(&tog_mutex);
1481 		if (errcode)
1482 			return got_error_set_errno(errcode,
1483 			    "pthread_mutex_unlock");
1484 		sched_yield();
1485 		errcode = pthread_mutex_lock(&tog_mutex);
1486 		if (errcode)
1487 			return got_error_set_errno(errcode,
1488 			    "pthread_mutex_lock");
1489 		view->search_next(view);
1490 		return NULL;
1491 	}
1492 
1493 	/* Allow threads to make progress while we are waiting for input. */
1494 	errcode = pthread_mutex_unlock(&tog_mutex);
1495 	if (errcode)
1496 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1497 	/* If we have an unfinished count, let C-g or backspace abort. */
1498 	if (view->count && --view->count) {
1499 		cbreak();
1500 		nodelay(view->window, TRUE);
1501 		ch = wgetch(view->window);
1502 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1503 			view->count = 0;
1504 		else
1505 			ch = view->ch;
1506 	} else {
1507 		ch = wgetch(view->window);
1508 		if (ch >= '1' && ch  <= '9')
1509 			view->ch = ch = get_compound_key(view, ch);
1510 	}
1511 	if (view->hiline && ch != ERR && ch != 0)
1512 		view->hiline = 0;  /* key pressed, clear line highlight */
1513 	nodelay(view->window, TRUE);
1514 	errcode = pthread_mutex_lock(&tog_mutex);
1515 	if (errcode)
1516 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1517 
1518 	if (tog_sigwinch_received || tog_sigcont_received) {
1519 		tog_resizeterm();
1520 		tog_sigwinch_received = 0;
1521 		tog_sigcont_received = 0;
1522 		TAILQ_FOREACH(v, views, entry) {
1523 			err = view_resize(v);
1524 			if (err)
1525 				return err;
1526 			err = v->input(new, v, KEY_RESIZE);
1527 			if (err)
1528 				return err;
1529 			if (v->child) {
1530 				err = view_resize(v->child);
1531 				if (err)
1532 					return err;
1533 				err = v->child->input(new, v->child,
1534 				    KEY_RESIZE);
1535 				if (err)
1536 					return err;
1537 				if (v->child->resized_x || v->child->resized_y) {
1538 					err = view_resize_split(v, 0);
1539 					if (err)
1540 						return err;
1541 				}
1542 			}
1543 		}
1544 	}
1545 
1546 	switch (ch) {
1547 	case '?':
1548 	case 'H':
1549 	case KEY_F(1):
1550 		if (view->type == TOG_VIEW_HELP)
1551 			err = view->reset(view);
1552 		else
1553 			err = view_request_new(new, view, TOG_VIEW_HELP);
1554 		break;
1555 	case '\t':
1556 		view->count = 0;
1557 		if (view->child) {
1558 			view->focussed = 0;
1559 			view->child->focussed = 1;
1560 			view->focus_child = 1;
1561 		} else if (view->parent) {
1562 			view->focussed = 0;
1563 			view->parent->focussed = 1;
1564 			view->parent->focus_child = 0;
1565 			if (!view_is_splitscreen(view)) {
1566 				if (view->parent->resize) {
1567 					err = view->parent->resize(view->parent,
1568 					    0);
1569 					if (err)
1570 						return err;
1571 				}
1572 				offset_selection_up(view->parent);
1573 				err = view_fullscreen(view->parent);
1574 				if (err)
1575 					return err;
1576 			}
1577 		}
1578 		break;
1579 	case 'q':
1580 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1581 			if (view->parent->resize) {
1582 				/* might need more commits to fill fullscreen */
1583 				err = view->parent->resize(view->parent, 0);
1584 				if (err)
1585 					break;
1586 			}
1587 			offset_selection_up(view->parent);
1588 		}
1589 		err = view->input(new, view, ch);
1590 		view->dying = 1;
1591 		break;
1592 	case 'Q':
1593 		*done = 1;
1594 		break;
1595 	case 'F':
1596 		view->count = 0;
1597 		if (view_is_parent_view(view)) {
1598 			if (view->child == NULL)
1599 				break;
1600 			if (view_is_splitscreen(view->child)) {
1601 				view->focussed = 0;
1602 				view->child->focussed = 1;
1603 				err = view_fullscreen(view->child);
1604 			} else {
1605 				err = view_splitscreen(view->child);
1606 				if (!err)
1607 					err = view_resize_split(view, 0);
1608 			}
1609 			if (err)
1610 				break;
1611 			err = view->child->input(new, view->child,
1612 			    KEY_RESIZE);
1613 		} else {
1614 			if (view_is_splitscreen(view)) {
1615 				view->parent->focussed = 0;
1616 				view->focussed = 1;
1617 				err = view_fullscreen(view);
1618 			} else {
1619 				err = view_splitscreen(view);
1620 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1621 					err = view_resize(view->parent);
1622 				if (!err)
1623 					err = view_resize_split(view, 0);
1624 			}
1625 			if (err)
1626 				break;
1627 			err = view->input(new, view, KEY_RESIZE);
1628 		}
1629 		if (err)
1630 			break;
1631 		if (view->resize) {
1632 			err = view->resize(view, 0);
1633 			if (err)
1634 				break;
1635 		}
1636 		if (view->parent)
1637 			err = offset_selection_down(view->parent);
1638 		if (!err)
1639 			err = offset_selection_down(view);
1640 		break;
1641 	case 'S':
1642 		view->count = 0;
1643 		err = switch_split(view);
1644 		break;
1645 	case '-':
1646 		err = view_resize_split(view, -1);
1647 		break;
1648 	case '+':
1649 		err = view_resize_split(view, 1);
1650 		break;
1651 	case KEY_RESIZE:
1652 		break;
1653 	case '/':
1654 		view->count = 0;
1655 		if (view->search_start)
1656 			view_search_start(view);
1657 		else
1658 			err = view->input(new, view, ch);
1659 		break;
1660 	case 'N':
1661 	case 'n':
1662 		if (view->search_started && view->search_next) {
1663 			view->searching = (ch == 'n' ?
1664 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1665 			view->search_next_done = 0;
1666 			view->search_next(view);
1667 		} else
1668 			err = view->input(new, view, ch);
1669 		break;
1670 	case 'A':
1671 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1672 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1673 		else
1674 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1675 		TAILQ_FOREACH(v, views, entry) {
1676 			if (v->reset) {
1677 				err = v->reset(v);
1678 				if (err)
1679 					return err;
1680 			}
1681 			if (v->child && v->child->reset) {
1682 				err = v->child->reset(v->child);
1683 				if (err)
1684 					return err;
1685 			}
1686 		}
1687 		break;
1688 	default:
1689 		err = view->input(new, view, ch);
1690 		break;
1691 	}
1692 
1693 	return err;
1694 }
1695 
1696 static int
1697 view_needs_focus_indication(struct tog_view *view)
1698 {
1699 	if (view_is_parent_view(view)) {
1700 		if (view->child == NULL || view->child->focussed)
1701 			return 0;
1702 		if (!view_is_splitscreen(view->child))
1703 			return 0;
1704 	} else if (!view_is_splitscreen(view))
1705 		return 0;
1706 
1707 	return view->focussed;
1708 }
1709 
1710 static const struct got_error *
1711 view_loop(struct tog_view *view)
1712 {
1713 	const struct got_error *err = NULL;
1714 	struct tog_view_list_head views;
1715 	struct tog_view *new_view;
1716 	char *mode;
1717 	int fast_refresh = 10;
1718 	int done = 0, errcode;
1719 
1720 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1721 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1722 		view->mode = TOG_VIEW_SPLIT_VERT;
1723 	else
1724 		view->mode = TOG_VIEW_SPLIT_HRZN;
1725 
1726 	errcode = pthread_mutex_lock(&tog_mutex);
1727 	if (errcode)
1728 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1729 
1730 	TAILQ_INIT(&views);
1731 	TAILQ_INSERT_HEAD(&views, view, entry);
1732 
1733 	view->focussed = 1;
1734 	err = view->show(view);
1735 	if (err)
1736 		return err;
1737 	update_panels();
1738 	doupdate();
1739 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1740 	    !tog_fatal_signal_received()) {
1741 		/* Refresh fast during initialization, then become slower. */
1742 		if (fast_refresh && fast_refresh-- == 0)
1743 			halfdelay(10); /* switch to once per second */
1744 
1745 		err = view_input(&new_view, &done, view, &views);
1746 		if (err)
1747 			break;
1748 		if (view->dying) {
1749 			struct tog_view *v, *prev = NULL;
1750 
1751 			if (view_is_parent_view(view))
1752 				prev = TAILQ_PREV(view, tog_view_list_head,
1753 				    entry);
1754 			else if (view->parent)
1755 				prev = view->parent;
1756 
1757 			if (view->parent) {
1758 				view->parent->child = NULL;
1759 				view->parent->focus_child = 0;
1760 				/* Restore fullscreen line height. */
1761 				view->parent->nlines = view->parent->lines;
1762 				err = view_resize(view->parent);
1763 				if (err)
1764 					break;
1765 				/* Make resized splits persist. */
1766 				view_transfer_size(view->parent, view);
1767 			} else
1768 				TAILQ_REMOVE(&views, view, entry);
1769 
1770 			err = view_close(view);
1771 			if (err)
1772 				goto done;
1773 
1774 			view = NULL;
1775 			TAILQ_FOREACH(v, &views, entry) {
1776 				if (v->focussed)
1777 					break;
1778 			}
1779 			if (view == NULL && new_view == NULL) {
1780 				/* No view has focus. Try to pick one. */
1781 				if (prev)
1782 					view = prev;
1783 				else if (!TAILQ_EMPTY(&views)) {
1784 					view = TAILQ_LAST(&views,
1785 					    tog_view_list_head);
1786 				}
1787 				if (view) {
1788 					if (view->focus_child) {
1789 						view->child->focussed = 1;
1790 						view = view->child;
1791 					} else
1792 						view->focussed = 1;
1793 				}
1794 			}
1795 		}
1796 		if (new_view) {
1797 			struct tog_view *v, *t;
1798 			/* Only allow one parent view per type. */
1799 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1800 				if (v->type != new_view->type)
1801 					continue;
1802 				TAILQ_REMOVE(&views, v, entry);
1803 				err = view_close(v);
1804 				if (err)
1805 					goto done;
1806 				break;
1807 			}
1808 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1809 			view = new_view;
1810 		}
1811 		if (view) {
1812 			if (view_is_parent_view(view)) {
1813 				if (view->child && view->child->focussed)
1814 					view = view->child;
1815 			} else {
1816 				if (view->parent && view->parent->focussed)
1817 					view = view->parent;
1818 			}
1819 			show_panel(view->panel);
1820 			if (view->child && view_is_splitscreen(view->child))
1821 				show_panel(view->child->panel);
1822 			if (view->parent && view_is_splitscreen(view)) {
1823 				err = view->parent->show(view->parent);
1824 				if (err)
1825 					goto done;
1826 			}
1827 			err = view->show(view);
1828 			if (err)
1829 				goto done;
1830 			if (view->child) {
1831 				err = view->child->show(view->child);
1832 				if (err)
1833 					goto done;
1834 			}
1835 			update_panels();
1836 			doupdate();
1837 		}
1838 	}
1839 done:
1840 	while (!TAILQ_EMPTY(&views)) {
1841 		const struct got_error *close_err;
1842 		view = TAILQ_FIRST(&views);
1843 		TAILQ_REMOVE(&views, view, entry);
1844 		close_err = view_close(view);
1845 		if (close_err && err == NULL)
1846 			err = close_err;
1847 	}
1848 
1849 	errcode = pthread_mutex_unlock(&tog_mutex);
1850 	if (errcode && err == NULL)
1851 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1852 
1853 	return err;
1854 }
1855 
1856 __dead static void
1857 usage_log(void)
1858 {
1859 	endwin();
1860 	fprintf(stderr,
1861 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1862 	    getprogname());
1863 	exit(1);
1864 }
1865 
1866 /* Create newly allocated wide-character string equivalent to a byte string. */
1867 static const struct got_error *
1868 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1869 {
1870 	char *vis = NULL;
1871 	const struct got_error *err = NULL;
1872 
1873 	*ws = NULL;
1874 	*wlen = mbstowcs(NULL, s, 0);
1875 	if (*wlen == (size_t)-1) {
1876 		int vislen;
1877 		if (errno != EILSEQ)
1878 			return got_error_from_errno("mbstowcs");
1879 
1880 		/* byte string invalid in current encoding; try to "fix" it */
1881 		err = got_mbsavis(&vis, &vislen, s);
1882 		if (err)
1883 			return err;
1884 		*wlen = mbstowcs(NULL, vis, 0);
1885 		if (*wlen == (size_t)-1) {
1886 			err = got_error_from_errno("mbstowcs"); /* give up */
1887 			goto done;
1888 		}
1889 	}
1890 
1891 	*ws = calloc(*wlen + 1, sizeof(**ws));
1892 	if (*ws == NULL) {
1893 		err = got_error_from_errno("calloc");
1894 		goto done;
1895 	}
1896 
1897 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1898 		err = got_error_from_errno("mbstowcs");
1899 done:
1900 	free(vis);
1901 	if (err) {
1902 		free(*ws);
1903 		*ws = NULL;
1904 		*wlen = 0;
1905 	}
1906 	return err;
1907 }
1908 
1909 static const struct got_error *
1910 expand_tab(char **ptr, const char *src)
1911 {
1912 	char	*dst;
1913 	size_t	 len, n, idx = 0, sz = 0;
1914 
1915 	*ptr = NULL;
1916 	n = len = strlen(src);
1917 	dst = malloc(n + 1);
1918 	if (dst == NULL)
1919 		return got_error_from_errno("malloc");
1920 
1921 	while (idx < len && src[idx]) {
1922 		const char c = src[idx];
1923 
1924 		if (c == '\t') {
1925 			size_t nb = TABSIZE - sz % TABSIZE;
1926 			char *p;
1927 
1928 			p = realloc(dst, n + nb);
1929 			if (p == NULL) {
1930 				free(dst);
1931 				return got_error_from_errno("realloc");
1932 
1933 			}
1934 			dst = p;
1935 			n += nb;
1936 			memset(dst + sz, ' ', nb);
1937 			sz += nb;
1938 		} else
1939 			dst[sz++] = src[idx];
1940 		++idx;
1941 	}
1942 
1943 	dst[sz] = '\0';
1944 	*ptr = dst;
1945 	return NULL;
1946 }
1947 
1948 /*
1949  * Advance at most n columns from wline starting at offset off.
1950  * Return the index to the first character after the span operation.
1951  * Return the combined column width of all spanned wide character in
1952  * *rcol.
1953  */
1954 static int
1955 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1956 {
1957 	int width, i, cols = 0;
1958 
1959 	if (n == 0) {
1960 		*rcol = cols;
1961 		return off;
1962 	}
1963 
1964 	for (i = off; wline[i] != L'\0'; ++i) {
1965 		if (wline[i] == L'\t')
1966 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1967 		else
1968 			width = wcwidth(wline[i]);
1969 
1970 		if (width == -1) {
1971 			width = 1;
1972 			wline[i] = L'.';
1973 		}
1974 
1975 		if (cols + width > n)
1976 			break;
1977 		cols += width;
1978 	}
1979 
1980 	*rcol = cols;
1981 	return i;
1982 }
1983 
1984 /*
1985  * Format a line for display, ensuring that it won't overflow a width limit.
1986  * With scrolling, the width returned refers to the scrolled version of the
1987  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1988  */
1989 static const struct got_error *
1990 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1991     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1992 {
1993 	const struct got_error *err = NULL;
1994 	int cols;
1995 	wchar_t *wline = NULL;
1996 	char *exstr = NULL;
1997 	size_t wlen;
1998 	int i, scrollx;
1999 
2000 	*wlinep = NULL;
2001 	*widthp = 0;
2002 
2003 	if (expand) {
2004 		err = expand_tab(&exstr, line);
2005 		if (err)
2006 			return err;
2007 	}
2008 
2009 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2010 	free(exstr);
2011 	if (err)
2012 		return err;
2013 
2014 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2015 
2016 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2017 		wline[wlen - 1] = L'\0';
2018 		wlen--;
2019 	}
2020 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2021 		wline[wlen - 1] = L'\0';
2022 		wlen--;
2023 	}
2024 
2025 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2026 	wline[i] = L'\0';
2027 
2028 	if (widthp)
2029 		*widthp = cols;
2030 	if (scrollxp)
2031 		*scrollxp = scrollx;
2032 	if (err)
2033 		free(wline);
2034 	else
2035 		*wlinep = wline;
2036 	return err;
2037 }
2038 
2039 static const struct got_error*
2040 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2041     struct got_object_id *id, struct got_repository *repo)
2042 {
2043 	static const struct got_error *err = NULL;
2044 	struct got_reflist_entry *re;
2045 	char *s;
2046 	const char *name;
2047 
2048 	*refs_str = NULL;
2049 
2050 	TAILQ_FOREACH(re, refs, entry) {
2051 		struct got_tag_object *tag = NULL;
2052 		struct got_object_id *ref_id;
2053 		int cmp;
2054 
2055 		name = got_ref_get_name(re->ref);
2056 		if (strcmp(name, GOT_REF_HEAD) == 0)
2057 			continue;
2058 		if (strncmp(name, "refs/", 5) == 0)
2059 			name += 5;
2060 		if (strncmp(name, "got/", 4) == 0 &&
2061 		    strncmp(name, "got/backup/", 11) != 0)
2062 			continue;
2063 		if (strncmp(name, "heads/", 6) == 0)
2064 			name += 6;
2065 		if (strncmp(name, "remotes/", 8) == 0) {
2066 			name += 8;
2067 			s = strstr(name, "/" GOT_REF_HEAD);
2068 			if (s != NULL && s[strlen(s)] == '\0')
2069 				continue;
2070 		}
2071 		err = got_ref_resolve(&ref_id, repo, re->ref);
2072 		if (err)
2073 			break;
2074 		if (strncmp(name, "tags/", 5) == 0) {
2075 			err = got_object_open_as_tag(&tag, repo, ref_id);
2076 			if (err) {
2077 				if (err->code != GOT_ERR_OBJ_TYPE) {
2078 					free(ref_id);
2079 					break;
2080 				}
2081 				/* Ref points at something other than a tag. */
2082 				err = NULL;
2083 				tag = NULL;
2084 			}
2085 		}
2086 		cmp = got_object_id_cmp(tag ?
2087 		    got_object_tag_get_object_id(tag) : ref_id, id);
2088 		free(ref_id);
2089 		if (tag)
2090 			got_object_tag_close(tag);
2091 		if (cmp != 0)
2092 			continue;
2093 		s = *refs_str;
2094 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2095 		    s ? ", " : "", name) == -1) {
2096 			err = got_error_from_errno("asprintf");
2097 			free(s);
2098 			*refs_str = NULL;
2099 			break;
2100 		}
2101 		free(s);
2102 	}
2103 
2104 	return err;
2105 }
2106 
2107 static const struct got_error *
2108 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2109     int col_tab_align)
2110 {
2111 	char *smallerthan;
2112 
2113 	smallerthan = strchr(author, '<');
2114 	if (smallerthan && smallerthan[1] != '\0')
2115 		author = smallerthan + 1;
2116 	author[strcspn(author, "@>")] = '\0';
2117 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2118 	    col_tab_align, 0);
2119 }
2120 
2121 static const struct got_error *
2122 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2123     struct got_object_id *id, const size_t date_display_cols,
2124     int author_display_cols)
2125 {
2126 	struct tog_log_view_state *s = &view->state.log;
2127 	const struct got_error *err = NULL;
2128 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2129 	char *logmsg0 = NULL, *logmsg = NULL;
2130 	char *author = NULL;
2131 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2132 	int author_width, logmsg_width;
2133 	char *newline, *line = NULL;
2134 	int col, limit, scrollx;
2135 	const int avail = view->ncols;
2136 	struct tm tm;
2137 	time_t committer_time;
2138 	struct tog_color *tc;
2139 
2140 	committer_time = got_object_commit_get_committer_time(commit);
2141 	if (gmtime_r(&committer_time, &tm) == NULL)
2142 		return got_error_from_errno("gmtime_r");
2143 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2144 		return got_error(GOT_ERR_NO_SPACE);
2145 
2146 	if (avail <= date_display_cols)
2147 		limit = MIN(sizeof(datebuf) - 1, avail);
2148 	else
2149 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2150 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2151 	if (tc)
2152 		wattr_on(view->window,
2153 		    COLOR_PAIR(tc->colorpair), NULL);
2154 	waddnstr(view->window, datebuf, limit);
2155 	if (tc)
2156 		wattr_off(view->window,
2157 		    COLOR_PAIR(tc->colorpair), NULL);
2158 	col = limit;
2159 	if (col > avail)
2160 		goto done;
2161 
2162 	if (avail >= 120) {
2163 		char *id_str;
2164 		err = got_object_id_str(&id_str, id);
2165 		if (err)
2166 			goto done;
2167 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2168 		if (tc)
2169 			wattr_on(view->window,
2170 			    COLOR_PAIR(tc->colorpair), NULL);
2171 		wprintw(view->window, "%.8s ", id_str);
2172 		if (tc)
2173 			wattr_off(view->window,
2174 			    COLOR_PAIR(tc->colorpair), NULL);
2175 		free(id_str);
2176 		col += 9;
2177 		if (col > avail)
2178 			goto done;
2179 	}
2180 
2181 	if (s->use_committer)
2182 		author = strdup(got_object_commit_get_committer(commit));
2183 	else
2184 		author = strdup(got_object_commit_get_author(commit));
2185 	if (author == NULL) {
2186 		err = got_error_from_errno("strdup");
2187 		goto done;
2188 	}
2189 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2190 	if (err)
2191 		goto done;
2192 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2193 	if (tc)
2194 		wattr_on(view->window,
2195 		    COLOR_PAIR(tc->colorpair), NULL);
2196 	waddwstr(view->window, wauthor);
2197 	col += author_width;
2198 	while (col < avail && author_width < author_display_cols + 2) {
2199 		waddch(view->window, ' ');
2200 		col++;
2201 		author_width++;
2202 	}
2203 	if (tc)
2204 		wattr_off(view->window,
2205 		    COLOR_PAIR(tc->colorpair), NULL);
2206 	if (col > avail)
2207 		goto done;
2208 
2209 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2210 	if (err)
2211 		goto done;
2212 	logmsg = logmsg0;
2213 	while (*logmsg == '\n')
2214 		logmsg++;
2215 	newline = strchr(logmsg, '\n');
2216 	if (newline)
2217 		*newline = '\0';
2218 	limit = avail - col;
2219 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2220 		limit--;	/* for the border */
2221 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2222 	    limit, col, 1);
2223 	if (err)
2224 		goto done;
2225 	waddwstr(view->window, &wlogmsg[scrollx]);
2226 	col += MAX(logmsg_width, 0);
2227 	while (col < avail) {
2228 		waddch(view->window, ' ');
2229 		col++;
2230 	}
2231 done:
2232 	free(logmsg0);
2233 	free(wlogmsg);
2234 	free(author);
2235 	free(wauthor);
2236 	free(line);
2237 	return err;
2238 }
2239 
2240 static struct commit_queue_entry *
2241 alloc_commit_queue_entry(struct got_commit_object *commit,
2242     struct got_object_id *id)
2243 {
2244 	struct commit_queue_entry *entry;
2245 	struct got_object_id *dup;
2246 
2247 	entry = calloc(1, sizeof(*entry));
2248 	if (entry == NULL)
2249 		return NULL;
2250 
2251 	dup = got_object_id_dup(id);
2252 	if (dup == NULL) {
2253 		free(entry);
2254 		return NULL;
2255 	}
2256 
2257 	entry->id = dup;
2258 	entry->commit = commit;
2259 	return entry;
2260 }
2261 
2262 static void
2263 pop_commit(struct commit_queue *commits)
2264 {
2265 	struct commit_queue_entry *entry;
2266 
2267 	entry = TAILQ_FIRST(&commits->head);
2268 	TAILQ_REMOVE(&commits->head, entry, entry);
2269 	got_object_commit_close(entry->commit);
2270 	commits->ncommits--;
2271 	free(entry->id);
2272 	free(entry);
2273 }
2274 
2275 static void
2276 free_commits(struct commit_queue *commits)
2277 {
2278 	while (!TAILQ_EMPTY(&commits->head))
2279 		pop_commit(commits);
2280 }
2281 
2282 static const struct got_error *
2283 match_commit(int *have_match, struct got_object_id *id,
2284     struct got_commit_object *commit, regex_t *regex)
2285 {
2286 	const struct got_error *err = NULL;
2287 	regmatch_t regmatch;
2288 	char *id_str = NULL, *logmsg = NULL;
2289 
2290 	*have_match = 0;
2291 
2292 	err = got_object_id_str(&id_str, id);
2293 	if (err)
2294 		return err;
2295 
2296 	err = got_object_commit_get_logmsg(&logmsg, commit);
2297 	if (err)
2298 		goto done;
2299 
2300 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2301 	    &regmatch, 0) == 0 ||
2302 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2303 	    &regmatch, 0) == 0 ||
2304 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2305 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2306 		*have_match = 1;
2307 done:
2308 	free(id_str);
2309 	free(logmsg);
2310 	return err;
2311 }
2312 
2313 static const struct got_error *
2314 queue_commits(struct tog_log_thread_args *a)
2315 {
2316 	const struct got_error *err = NULL;
2317 
2318 	/*
2319 	 * We keep all commits open throughout the lifetime of the log
2320 	 * view in order to avoid having to re-fetch commits from disk
2321 	 * while updating the display.
2322 	 */
2323 	do {
2324 		struct got_object_id id;
2325 		struct got_commit_object *commit;
2326 		struct commit_queue_entry *entry;
2327 		int limit_match = 0;
2328 		int errcode;
2329 
2330 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2331 		    NULL, NULL);
2332 		if (err)
2333 			break;
2334 
2335 		err = got_object_open_as_commit(&commit, a->repo, &id);
2336 		if (err)
2337 			break;
2338 		entry = alloc_commit_queue_entry(commit, &id);
2339 		if (entry == NULL) {
2340 			err = got_error_from_errno("alloc_commit_queue_entry");
2341 			break;
2342 		}
2343 
2344 		errcode = pthread_mutex_lock(&tog_mutex);
2345 		if (errcode) {
2346 			err = got_error_set_errno(errcode,
2347 			    "pthread_mutex_lock");
2348 			break;
2349 		}
2350 
2351 		entry->idx = a->real_commits->ncommits;
2352 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2353 		a->real_commits->ncommits++;
2354 
2355 		if (*a->limiting) {
2356 			err = match_commit(&limit_match, &id, commit,
2357 			    a->limit_regex);
2358 			if (err)
2359 				break;
2360 
2361 			if (limit_match) {
2362 				struct commit_queue_entry *matched;
2363 
2364 				matched = alloc_commit_queue_entry(
2365 				    entry->commit, entry->id);
2366 				if (matched == NULL) {
2367 					err = got_error_from_errno(
2368 					    "alloc_commit_queue_entry");
2369 					break;
2370 				}
2371 				matched->commit = entry->commit;
2372 				got_object_commit_retain(entry->commit);
2373 
2374 				matched->idx = a->limit_commits->ncommits;
2375 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2376 				    matched, entry);
2377 				a->limit_commits->ncommits++;
2378 			}
2379 
2380 			/*
2381 			 * This is how we signal log_thread() that we
2382 			 * have found a match, and that it should be
2383 			 * counted as a new entry for the view.
2384 			 */
2385 			a->limit_match = limit_match;
2386 		}
2387 
2388 		if (*a->searching == TOG_SEARCH_FORWARD &&
2389 		    !*a->search_next_done) {
2390 			int have_match;
2391 			err = match_commit(&have_match, &id, commit, a->regex);
2392 			if (err)
2393 				break;
2394 
2395 			if (*a->limiting) {
2396 				if (limit_match && have_match)
2397 					*a->search_next_done =
2398 					    TOG_SEARCH_HAVE_MORE;
2399 			} else if (have_match)
2400 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2401 		}
2402 
2403 		errcode = pthread_mutex_unlock(&tog_mutex);
2404 		if (errcode && err == NULL)
2405 			err = got_error_set_errno(errcode,
2406 			    "pthread_mutex_unlock");
2407 		if (err)
2408 			break;
2409 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2410 
2411 	return err;
2412 }
2413 
2414 static void
2415 select_commit(struct tog_log_view_state *s)
2416 {
2417 	struct commit_queue_entry *entry;
2418 	int ncommits = 0;
2419 
2420 	entry = s->first_displayed_entry;
2421 	while (entry) {
2422 		if (ncommits == s->selected) {
2423 			s->selected_entry = entry;
2424 			break;
2425 		}
2426 		entry = TAILQ_NEXT(entry, entry);
2427 		ncommits++;
2428 	}
2429 }
2430 
2431 static const struct got_error *
2432 draw_commits(struct tog_view *view)
2433 {
2434 	const struct got_error *err = NULL;
2435 	struct tog_log_view_state *s = &view->state.log;
2436 	struct commit_queue_entry *entry = s->selected_entry;
2437 	int limit = view->nlines;
2438 	int width;
2439 	int ncommits, author_cols = 4;
2440 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2441 	char *refs_str = NULL;
2442 	wchar_t *wline;
2443 	struct tog_color *tc;
2444 	static const size_t date_display_cols = 12;
2445 
2446 	if (view_is_hsplit_top(view))
2447 		--limit;  /* account for border */
2448 
2449 	if (s->selected_entry &&
2450 	    !(view->searching && view->search_next_done == 0)) {
2451 		struct got_reflist_head *refs;
2452 		err = got_object_id_str(&id_str, s->selected_entry->id);
2453 		if (err)
2454 			return err;
2455 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2456 		    s->selected_entry->id);
2457 		if (refs) {
2458 			err = build_refs_str(&refs_str, refs,
2459 			    s->selected_entry->id, s->repo);
2460 			if (err)
2461 				goto done;
2462 		}
2463 	}
2464 
2465 	if (s->thread_args.commits_needed == 0)
2466 		halfdelay(10); /* disable fast refresh */
2467 
2468 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2469 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2470 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2471 		    (view->searching && !view->search_next_done) ?
2472 		    "searching..." : "loading...") == -1) {
2473 			err = got_error_from_errno("asprintf");
2474 			goto done;
2475 		}
2476 	} else {
2477 		const char *search_str = NULL;
2478 		const char *limit_str = NULL;
2479 
2480 		if (view->searching) {
2481 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2482 				search_str = "no more matches";
2483 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2484 				search_str = "no matches found";
2485 			else if (!view->search_next_done)
2486 				search_str = "searching...";
2487 		}
2488 
2489 		if (s->limit_view && s->commits->ncommits == 0)
2490 			limit_str = "no matches found";
2491 
2492 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2493 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2494 		    search_str ? search_str : (refs_str ? refs_str : ""),
2495 		    limit_str ? limit_str : "") == -1) {
2496 			err = got_error_from_errno("asprintf");
2497 			goto done;
2498 		}
2499 	}
2500 
2501 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2502 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2503 		    "........................................",
2504 		    s->in_repo_path, ncommits_str) == -1) {
2505 			err = got_error_from_errno("asprintf");
2506 			header = NULL;
2507 			goto done;
2508 		}
2509 	} else if (asprintf(&header, "commit %s%s",
2510 	    id_str ? id_str : "........................................",
2511 	    ncommits_str) == -1) {
2512 		err = got_error_from_errno("asprintf");
2513 		header = NULL;
2514 		goto done;
2515 	}
2516 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2517 	if (err)
2518 		goto done;
2519 
2520 	werase(view->window);
2521 
2522 	if (view_needs_focus_indication(view))
2523 		wstandout(view->window);
2524 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2525 	if (tc)
2526 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2527 	waddwstr(view->window, wline);
2528 	while (width < view->ncols) {
2529 		waddch(view->window, ' ');
2530 		width++;
2531 	}
2532 	if (tc)
2533 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2534 	if (view_needs_focus_indication(view))
2535 		wstandend(view->window);
2536 	free(wline);
2537 	if (limit <= 1)
2538 		goto done;
2539 
2540 	/* Grow author column size if necessary, and set view->maxx. */
2541 	entry = s->first_displayed_entry;
2542 	ncommits = 0;
2543 	view->maxx = 0;
2544 	while (entry) {
2545 		struct got_commit_object *c = entry->commit;
2546 		char *author, *eol, *msg, *msg0;
2547 		wchar_t *wauthor, *wmsg;
2548 		int width;
2549 		if (ncommits >= limit - 1)
2550 			break;
2551 		if (s->use_committer)
2552 			author = strdup(got_object_commit_get_committer(c));
2553 		else
2554 			author = strdup(got_object_commit_get_author(c));
2555 		if (author == NULL) {
2556 			err = got_error_from_errno("strdup");
2557 			goto done;
2558 		}
2559 		err = format_author(&wauthor, &width, author, COLS,
2560 		    date_display_cols);
2561 		if (author_cols < width)
2562 			author_cols = width;
2563 		free(wauthor);
2564 		free(author);
2565 		if (err)
2566 			goto done;
2567 		err = got_object_commit_get_logmsg(&msg0, c);
2568 		if (err)
2569 			goto done;
2570 		msg = msg0;
2571 		while (*msg == '\n')
2572 			++msg;
2573 		if ((eol = strchr(msg, '\n')))
2574 			*eol = '\0';
2575 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2576 		    date_display_cols + author_cols, 0);
2577 		if (err)
2578 			goto done;
2579 		view->maxx = MAX(view->maxx, width);
2580 		free(msg0);
2581 		free(wmsg);
2582 		ncommits++;
2583 		entry = TAILQ_NEXT(entry, entry);
2584 	}
2585 
2586 	entry = s->first_displayed_entry;
2587 	s->last_displayed_entry = s->first_displayed_entry;
2588 	ncommits = 0;
2589 	while (entry) {
2590 		if (ncommits >= limit - 1)
2591 			break;
2592 		if (ncommits == s->selected)
2593 			wstandout(view->window);
2594 		err = draw_commit(view, entry->commit, entry->id,
2595 		    date_display_cols, author_cols);
2596 		if (ncommits == s->selected)
2597 			wstandend(view->window);
2598 		if (err)
2599 			goto done;
2600 		ncommits++;
2601 		s->last_displayed_entry = entry;
2602 		entry = TAILQ_NEXT(entry, entry);
2603 	}
2604 
2605 	view_border(view);
2606 done:
2607 	free(id_str);
2608 	free(refs_str);
2609 	free(ncommits_str);
2610 	free(header);
2611 	return err;
2612 }
2613 
2614 static void
2615 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2616 {
2617 	struct commit_queue_entry *entry;
2618 	int nscrolled = 0;
2619 
2620 	entry = TAILQ_FIRST(&s->commits->head);
2621 	if (s->first_displayed_entry == entry)
2622 		return;
2623 
2624 	entry = s->first_displayed_entry;
2625 	while (entry && nscrolled < maxscroll) {
2626 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2627 		if (entry) {
2628 			s->first_displayed_entry = entry;
2629 			nscrolled++;
2630 		}
2631 	}
2632 }
2633 
2634 static const struct got_error *
2635 trigger_log_thread(struct tog_view *view, int wait)
2636 {
2637 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2638 	int errcode;
2639 
2640 	halfdelay(1); /* fast refresh while loading commits */
2641 
2642 	while (!ta->log_complete && !tog_thread_error &&
2643 	    (ta->commits_needed > 0 || ta->load_all)) {
2644 		/* Wake the log thread. */
2645 		errcode = pthread_cond_signal(&ta->need_commits);
2646 		if (errcode)
2647 			return got_error_set_errno(errcode,
2648 			    "pthread_cond_signal");
2649 
2650 		/*
2651 		 * The mutex will be released while the view loop waits
2652 		 * in wgetch(), at which time the log thread will run.
2653 		 */
2654 		if (!wait)
2655 			break;
2656 
2657 		/* Display progress update in log view. */
2658 		show_log_view(view);
2659 		update_panels();
2660 		doupdate();
2661 
2662 		/* Wait right here while next commit is being loaded. */
2663 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2664 		if (errcode)
2665 			return got_error_set_errno(errcode,
2666 			    "pthread_cond_wait");
2667 
2668 		/* Display progress update in log view. */
2669 		show_log_view(view);
2670 		update_panels();
2671 		doupdate();
2672 	}
2673 
2674 	return NULL;
2675 }
2676 
2677 static const struct got_error *
2678 request_log_commits(struct tog_view *view)
2679 {
2680 	struct tog_log_view_state	*state = &view->state.log;
2681 	const struct got_error		*err = NULL;
2682 
2683 	if (state->thread_args.log_complete)
2684 		return NULL;
2685 
2686 	state->thread_args.commits_needed += view->nscrolled;
2687 	err = trigger_log_thread(view, 1);
2688 	view->nscrolled = 0;
2689 
2690 	return err;
2691 }
2692 
2693 static const struct got_error *
2694 log_scroll_down(struct tog_view *view, int maxscroll)
2695 {
2696 	struct tog_log_view_state *s = &view->state.log;
2697 	const struct got_error *err = NULL;
2698 	struct commit_queue_entry *pentry;
2699 	int nscrolled = 0, ncommits_needed;
2700 
2701 	if (s->last_displayed_entry == NULL)
2702 		return NULL;
2703 
2704 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2705 	if (s->commits->ncommits < ncommits_needed &&
2706 	    !s->thread_args.log_complete) {
2707 		/*
2708 		 * Ask the log thread for required amount of commits.
2709 		 */
2710 		s->thread_args.commits_needed +=
2711 		    ncommits_needed - s->commits->ncommits;
2712 		err = trigger_log_thread(view, 1);
2713 		if (err)
2714 			return err;
2715 	}
2716 
2717 	do {
2718 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2719 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2720 			break;
2721 
2722 		s->last_displayed_entry = pentry ?
2723 		    pentry : s->last_displayed_entry;
2724 
2725 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2726 		if (pentry == NULL)
2727 			break;
2728 		s->first_displayed_entry = pentry;
2729 	} while (++nscrolled < maxscroll);
2730 
2731 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2732 		view->nscrolled += nscrolled;
2733 	else
2734 		view->nscrolled = 0;
2735 
2736 	return err;
2737 }
2738 
2739 static const struct got_error *
2740 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2741     struct got_commit_object *commit, struct got_object_id *commit_id,
2742     struct tog_view *log_view, struct got_repository *repo)
2743 {
2744 	const struct got_error *err;
2745 	struct got_object_qid *parent_id;
2746 	struct tog_view *diff_view;
2747 
2748 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2749 	if (diff_view == NULL)
2750 		return got_error_from_errno("view_open");
2751 
2752 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2753 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2754 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2755 	if (err == NULL)
2756 		*new_view = diff_view;
2757 	return err;
2758 }
2759 
2760 static const struct got_error *
2761 tree_view_visit_subtree(struct tog_tree_view_state *s,
2762     struct got_tree_object *subtree)
2763 {
2764 	struct tog_parent_tree *parent;
2765 
2766 	parent = calloc(1, sizeof(*parent));
2767 	if (parent == NULL)
2768 		return got_error_from_errno("calloc");
2769 
2770 	parent->tree = s->tree;
2771 	parent->first_displayed_entry = s->first_displayed_entry;
2772 	parent->selected_entry = s->selected_entry;
2773 	parent->selected = s->selected;
2774 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2775 	s->tree = subtree;
2776 	s->selected = 0;
2777 	s->first_displayed_entry = NULL;
2778 	return NULL;
2779 }
2780 
2781 static const struct got_error *
2782 tree_view_walk_path(struct tog_tree_view_state *s,
2783     struct got_commit_object *commit, const char *path)
2784 {
2785 	const struct got_error *err = NULL;
2786 	struct got_tree_object *tree = NULL;
2787 	const char *p;
2788 	char *slash, *subpath = NULL;
2789 
2790 	/* Walk the path and open corresponding tree objects. */
2791 	p = path;
2792 	while (*p) {
2793 		struct got_tree_entry *te;
2794 		struct got_object_id *tree_id;
2795 		char *te_name;
2796 
2797 		while (p[0] == '/')
2798 			p++;
2799 
2800 		/* Ensure the correct subtree entry is selected. */
2801 		slash = strchr(p, '/');
2802 		if (slash == NULL)
2803 			te_name = strdup(p);
2804 		else
2805 			te_name = strndup(p, slash - p);
2806 		if (te_name == NULL) {
2807 			err = got_error_from_errno("strndup");
2808 			break;
2809 		}
2810 		te = got_object_tree_find_entry(s->tree, te_name);
2811 		if (te == NULL) {
2812 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2813 			free(te_name);
2814 			break;
2815 		}
2816 		free(te_name);
2817 		s->first_displayed_entry = s->selected_entry = te;
2818 
2819 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2820 			break; /* jump to this file's entry */
2821 
2822 		slash = strchr(p, '/');
2823 		if (slash)
2824 			subpath = strndup(path, slash - path);
2825 		else
2826 			subpath = strdup(path);
2827 		if (subpath == NULL) {
2828 			err = got_error_from_errno("strdup");
2829 			break;
2830 		}
2831 
2832 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2833 		    subpath);
2834 		if (err)
2835 			break;
2836 
2837 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2838 		free(tree_id);
2839 		if (err)
2840 			break;
2841 
2842 		err = tree_view_visit_subtree(s, tree);
2843 		if (err) {
2844 			got_object_tree_close(tree);
2845 			break;
2846 		}
2847 		if (slash == NULL)
2848 			break;
2849 		free(subpath);
2850 		subpath = NULL;
2851 		p = slash;
2852 	}
2853 
2854 	free(subpath);
2855 	return err;
2856 }
2857 
2858 static const struct got_error *
2859 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2860     struct commit_queue_entry *entry, const char *path,
2861     const char *head_ref_name, struct got_repository *repo)
2862 {
2863 	const struct got_error *err = NULL;
2864 	struct tog_tree_view_state *s;
2865 	struct tog_view *tree_view;
2866 
2867 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2868 	if (tree_view == NULL)
2869 		return got_error_from_errno("view_open");
2870 
2871 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2872 	if (err)
2873 		return err;
2874 	s = &tree_view->state.tree;
2875 
2876 	*new_view = tree_view;
2877 
2878 	if (got_path_is_root_dir(path))
2879 		return NULL;
2880 
2881 	return tree_view_walk_path(s, entry->commit, path);
2882 }
2883 
2884 static const struct got_error *
2885 block_signals_used_by_main_thread(void)
2886 {
2887 	sigset_t sigset;
2888 	int errcode;
2889 
2890 	if (sigemptyset(&sigset) == -1)
2891 		return got_error_from_errno("sigemptyset");
2892 
2893 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2894 	if (sigaddset(&sigset, SIGWINCH) == -1)
2895 		return got_error_from_errno("sigaddset");
2896 	if (sigaddset(&sigset, SIGCONT) == -1)
2897 		return got_error_from_errno("sigaddset");
2898 	if (sigaddset(&sigset, SIGINT) == -1)
2899 		return got_error_from_errno("sigaddset");
2900 	if (sigaddset(&sigset, SIGTERM) == -1)
2901 		return got_error_from_errno("sigaddset");
2902 
2903 	/* ncurses handles SIGTSTP */
2904 	if (sigaddset(&sigset, SIGTSTP) == -1)
2905 		return got_error_from_errno("sigaddset");
2906 
2907 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2908 	if (errcode)
2909 		return got_error_set_errno(errcode, "pthread_sigmask");
2910 
2911 	return NULL;
2912 }
2913 
2914 static void *
2915 log_thread(void *arg)
2916 {
2917 	const struct got_error *err = NULL;
2918 	int errcode = 0;
2919 	struct tog_log_thread_args *a = arg;
2920 	int done = 0;
2921 
2922 	/*
2923 	 * Sync startup with main thread such that we begin our
2924 	 * work once view_input() has released the mutex.
2925 	 */
2926 	errcode = pthread_mutex_lock(&tog_mutex);
2927 	if (errcode) {
2928 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2929 		return (void *)err;
2930 	}
2931 
2932 	err = block_signals_used_by_main_thread();
2933 	if (err) {
2934 		pthread_mutex_unlock(&tog_mutex);
2935 		goto done;
2936 	}
2937 
2938 	while (!done && !err && !tog_fatal_signal_received()) {
2939 		errcode = pthread_mutex_unlock(&tog_mutex);
2940 		if (errcode) {
2941 			err = got_error_set_errno(errcode,
2942 			    "pthread_mutex_unlock");
2943 			goto done;
2944 		}
2945 		err = queue_commits(a);
2946 		if (err) {
2947 			if (err->code != GOT_ERR_ITER_COMPLETED)
2948 				goto done;
2949 			err = NULL;
2950 			done = 1;
2951 		} else if (a->commits_needed > 0 && !a->load_all) {
2952 			if (*a->limiting) {
2953 				if (a->limit_match)
2954 					a->commits_needed--;
2955 			} else
2956 				a->commits_needed--;
2957 		}
2958 
2959 		errcode = pthread_mutex_lock(&tog_mutex);
2960 		if (errcode) {
2961 			err = got_error_set_errno(errcode,
2962 			    "pthread_mutex_lock");
2963 			goto done;
2964 		} else if (*a->quit)
2965 			done = 1;
2966 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2967 			*a->first_displayed_entry =
2968 			    TAILQ_FIRST(&a->limit_commits->head);
2969 			*a->selected_entry = *a->first_displayed_entry;
2970 		} else if (*a->first_displayed_entry == NULL) {
2971 			*a->first_displayed_entry =
2972 			    TAILQ_FIRST(&a->real_commits->head);
2973 			*a->selected_entry = *a->first_displayed_entry;
2974 		}
2975 
2976 		errcode = pthread_cond_signal(&a->commit_loaded);
2977 		if (errcode) {
2978 			err = got_error_set_errno(errcode,
2979 			    "pthread_cond_signal");
2980 			pthread_mutex_unlock(&tog_mutex);
2981 			goto done;
2982 		}
2983 
2984 		if (done)
2985 			a->commits_needed = 0;
2986 		else {
2987 			if (a->commits_needed == 0 && !a->load_all) {
2988 				errcode = pthread_cond_wait(&a->need_commits,
2989 				    &tog_mutex);
2990 				if (errcode) {
2991 					err = got_error_set_errno(errcode,
2992 					    "pthread_cond_wait");
2993 					pthread_mutex_unlock(&tog_mutex);
2994 					goto done;
2995 				}
2996 				if (*a->quit)
2997 					done = 1;
2998 			}
2999 		}
3000 	}
3001 	a->log_complete = 1;
3002 	errcode = pthread_mutex_unlock(&tog_mutex);
3003 	if (errcode)
3004 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3005 done:
3006 	if (err) {
3007 		tog_thread_error = 1;
3008 		pthread_cond_signal(&a->commit_loaded);
3009 	}
3010 	return (void *)err;
3011 }
3012 
3013 static const struct got_error *
3014 stop_log_thread(struct tog_log_view_state *s)
3015 {
3016 	const struct got_error *err = NULL, *thread_err = NULL;
3017 	int errcode;
3018 
3019 	if (s->thread) {
3020 		s->quit = 1;
3021 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3022 		if (errcode)
3023 			return got_error_set_errno(errcode,
3024 			    "pthread_cond_signal");
3025 		errcode = pthread_mutex_unlock(&tog_mutex);
3026 		if (errcode)
3027 			return got_error_set_errno(errcode,
3028 			    "pthread_mutex_unlock");
3029 		errcode = pthread_join(s->thread, (void **)&thread_err);
3030 		if (errcode)
3031 			return got_error_set_errno(errcode, "pthread_join");
3032 		errcode = pthread_mutex_lock(&tog_mutex);
3033 		if (errcode)
3034 			return got_error_set_errno(errcode,
3035 			    "pthread_mutex_lock");
3036 		s->thread = NULL;
3037 	}
3038 
3039 	if (s->thread_args.repo) {
3040 		err = got_repo_close(s->thread_args.repo);
3041 		s->thread_args.repo = NULL;
3042 	}
3043 
3044 	if (s->thread_args.pack_fds) {
3045 		const struct got_error *pack_err =
3046 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3047 		if (err == NULL)
3048 			err = pack_err;
3049 		s->thread_args.pack_fds = NULL;
3050 	}
3051 
3052 	if (s->thread_args.graph) {
3053 		got_commit_graph_close(s->thread_args.graph);
3054 		s->thread_args.graph = NULL;
3055 	}
3056 
3057 	return err ? err : thread_err;
3058 }
3059 
3060 static const struct got_error *
3061 close_log_view(struct tog_view *view)
3062 {
3063 	const struct got_error *err = NULL;
3064 	struct tog_log_view_state *s = &view->state.log;
3065 	int errcode;
3066 
3067 	err = stop_log_thread(s);
3068 
3069 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3070 	if (errcode && err == NULL)
3071 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3072 
3073 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3074 	if (errcode && err == NULL)
3075 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3076 
3077 	free_commits(&s->limit_commits);
3078 	free_commits(&s->real_commits);
3079 	free(s->in_repo_path);
3080 	s->in_repo_path = NULL;
3081 	free(s->start_id);
3082 	s->start_id = NULL;
3083 	free(s->head_ref_name);
3084 	s->head_ref_name = NULL;
3085 	return err;
3086 }
3087 
3088 /*
3089  * We use two queues to implement the limit feature: first consists of
3090  * commits matching the current limit_regex; second is the real queue
3091  * of all known commits (real_commits). When the user starts limiting,
3092  * we swap queues such that all movement and displaying functionality
3093  * works with very slight change.
3094  */
3095 static const struct got_error *
3096 limit_log_view(struct tog_view *view)
3097 {
3098 	struct tog_log_view_state *s = &view->state.log;
3099 	struct commit_queue_entry *entry;
3100 	struct tog_view	*v = view;
3101 	const struct got_error *err = NULL;
3102 	char pattern[1024];
3103 	int ret;
3104 
3105 	if (view_is_hsplit_top(view))
3106 		v = view->child;
3107 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3108 		v = view->parent;
3109 
3110 	/* Get the pattern */
3111 	wmove(v->window, v->nlines - 1, 0);
3112 	wclrtoeol(v->window);
3113 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3114 	nodelay(v->window, FALSE);
3115 	nocbreak();
3116 	echo();
3117 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3118 	cbreak();
3119 	noecho();
3120 	nodelay(v->window, TRUE);
3121 	if (ret == ERR)
3122 		return NULL;
3123 
3124 	if (*pattern == '\0') {
3125 		/*
3126 		 * Safety measure for the situation where the user
3127 		 * resets limit without previously limiting anything.
3128 		 */
3129 		if (!s->limit_view)
3130 			return NULL;
3131 
3132 		/*
3133 		 * User could have pressed Ctrl+L, which refreshed the
3134 		 * commit queues, it means we can't save previously
3135 		 * (before limit took place) displayed entries,
3136 		 * because they would point to already free'ed memory,
3137 		 * so we are forced to always select first entry of
3138 		 * the queue.
3139 		 */
3140 		s->commits = &s->real_commits;
3141 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3142 		s->selected_entry = s->first_displayed_entry;
3143 		s->selected = 0;
3144 		s->limit_view = 0;
3145 
3146 		return NULL;
3147 	}
3148 
3149 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3150 		return NULL;
3151 
3152 	s->limit_view = 1;
3153 
3154 	/* Clear the screen while loading limit view */
3155 	s->first_displayed_entry = NULL;
3156 	s->last_displayed_entry = NULL;
3157 	s->selected_entry = NULL;
3158 	s->commits = &s->limit_commits;
3159 
3160 	/* Prepare limit queue for new search */
3161 	free_commits(&s->limit_commits);
3162 	s->limit_commits.ncommits = 0;
3163 
3164 	/* First process commits, which are in queue already */
3165 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3166 		int have_match = 0;
3167 
3168 		err = match_commit(&have_match, entry->id,
3169 		    entry->commit, &s->limit_regex);
3170 		if (err)
3171 			return err;
3172 
3173 		if (have_match) {
3174 			struct commit_queue_entry *matched;
3175 
3176 			matched = alloc_commit_queue_entry(entry->commit,
3177 			    entry->id);
3178 			if (matched == NULL) {
3179 				err = got_error_from_errno(
3180 				    "alloc_commit_queue_entry");
3181 				break;
3182 			}
3183 			matched->commit = entry->commit;
3184 			got_object_commit_retain(entry->commit);
3185 
3186 			matched->idx = s->limit_commits.ncommits;
3187 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3188 			    matched, entry);
3189 			s->limit_commits.ncommits++;
3190 		}
3191 	}
3192 
3193 	/* Second process all the commits, until we fill the screen */
3194 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3195 	    !s->thread_args.log_complete) {
3196 		s->thread_args.commits_needed +=
3197 		    view->nlines - s->limit_commits.ncommits - 1;
3198 		err = trigger_log_thread(view, 1);
3199 		if (err)
3200 			return err;
3201 	}
3202 
3203 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3204 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3205 	s->selected = 0;
3206 
3207 	return NULL;
3208 }
3209 
3210 static const struct got_error *
3211 search_start_log_view(struct tog_view *view)
3212 {
3213 	struct tog_log_view_state *s = &view->state.log;
3214 
3215 	s->matched_entry = NULL;
3216 	s->search_entry = NULL;
3217 	return NULL;
3218 }
3219 
3220 static const struct got_error *
3221 search_next_log_view(struct tog_view *view)
3222 {
3223 	const struct got_error *err = NULL;
3224 	struct tog_log_view_state *s = &view->state.log;
3225 	struct commit_queue_entry *entry;
3226 
3227 	/* Display progress update in log view. */
3228 	show_log_view(view);
3229 	update_panels();
3230 	doupdate();
3231 
3232 	if (s->search_entry) {
3233 		int errcode, ch;
3234 		errcode = pthread_mutex_unlock(&tog_mutex);
3235 		if (errcode)
3236 			return got_error_set_errno(errcode,
3237 			    "pthread_mutex_unlock");
3238 		ch = wgetch(view->window);
3239 		errcode = pthread_mutex_lock(&tog_mutex);
3240 		if (errcode)
3241 			return got_error_set_errno(errcode,
3242 			    "pthread_mutex_lock");
3243 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3244 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3245 			return NULL;
3246 		}
3247 		if (view->searching == TOG_SEARCH_FORWARD)
3248 			entry = TAILQ_NEXT(s->search_entry, entry);
3249 		else
3250 			entry = TAILQ_PREV(s->search_entry,
3251 			    commit_queue_head, entry);
3252 	} else if (s->matched_entry) {
3253 		/*
3254 		 * If the user has moved the cursor after we hit a match,
3255 		 * the position from where we should continue searching
3256 		 * might have changed.
3257 		 */
3258 		if (view->searching == TOG_SEARCH_FORWARD)
3259 			entry = TAILQ_NEXT(s->selected_entry, entry);
3260 		else
3261 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3262 			    entry);
3263 	} else {
3264 		entry = s->selected_entry;
3265 	}
3266 
3267 	while (1) {
3268 		int have_match = 0;
3269 
3270 		if (entry == NULL) {
3271 			if (s->thread_args.log_complete ||
3272 			    view->searching == TOG_SEARCH_BACKWARD) {
3273 				view->search_next_done =
3274 				    (s->matched_entry == NULL ?
3275 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3276 				s->search_entry = NULL;
3277 				return NULL;
3278 			}
3279 			/*
3280 			 * Poke the log thread for more commits and return,
3281 			 * allowing the main loop to make progress. Search
3282 			 * will resume at s->search_entry once we come back.
3283 			 */
3284 			s->thread_args.commits_needed++;
3285 			return trigger_log_thread(view, 0);
3286 		}
3287 
3288 		err = match_commit(&have_match, entry->id, entry->commit,
3289 		    &view->regex);
3290 		if (err)
3291 			break;
3292 		if (have_match) {
3293 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3294 			s->matched_entry = entry;
3295 			break;
3296 		}
3297 
3298 		s->search_entry = entry;
3299 		if (view->searching == TOG_SEARCH_FORWARD)
3300 			entry = TAILQ_NEXT(entry, entry);
3301 		else
3302 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3303 	}
3304 
3305 	if (s->matched_entry) {
3306 		int cur = s->selected_entry->idx;
3307 		while (cur < s->matched_entry->idx) {
3308 			err = input_log_view(NULL, view, KEY_DOWN);
3309 			if (err)
3310 				return err;
3311 			cur++;
3312 		}
3313 		while (cur > s->matched_entry->idx) {
3314 			err = input_log_view(NULL, view, KEY_UP);
3315 			if (err)
3316 				return err;
3317 			cur--;
3318 		}
3319 	}
3320 
3321 	s->search_entry = NULL;
3322 
3323 	return NULL;
3324 }
3325 
3326 static const struct got_error *
3327 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3328     struct got_repository *repo, const char *head_ref_name,
3329     const char *in_repo_path, int log_branches)
3330 {
3331 	const struct got_error *err = NULL;
3332 	struct tog_log_view_state *s = &view->state.log;
3333 	struct got_repository *thread_repo = NULL;
3334 	struct got_commit_graph *thread_graph = NULL;
3335 	int errcode;
3336 
3337 	if (in_repo_path != s->in_repo_path) {
3338 		free(s->in_repo_path);
3339 		s->in_repo_path = strdup(in_repo_path);
3340 		if (s->in_repo_path == NULL)
3341 			return got_error_from_errno("strdup");
3342 	}
3343 
3344 	/* The commit queue only contains commits being displayed. */
3345 	TAILQ_INIT(&s->real_commits.head);
3346 	s->real_commits.ncommits = 0;
3347 	s->commits = &s->real_commits;
3348 
3349 	TAILQ_INIT(&s->limit_commits.head);
3350 	s->limit_view = 0;
3351 	s->limit_commits.ncommits = 0;
3352 
3353 	s->repo = repo;
3354 	if (head_ref_name) {
3355 		s->head_ref_name = strdup(head_ref_name);
3356 		if (s->head_ref_name == NULL) {
3357 			err = got_error_from_errno("strdup");
3358 			goto done;
3359 		}
3360 	}
3361 	s->start_id = got_object_id_dup(start_id);
3362 	if (s->start_id == NULL) {
3363 		err = got_error_from_errno("got_object_id_dup");
3364 		goto done;
3365 	}
3366 	s->log_branches = log_branches;
3367 	s->use_committer = 1;
3368 
3369 	STAILQ_INIT(&s->colors);
3370 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3371 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3372 		    get_color_value("TOG_COLOR_COMMIT"));
3373 		if (err)
3374 			goto done;
3375 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3376 		    get_color_value("TOG_COLOR_AUTHOR"));
3377 		if (err) {
3378 			free_colors(&s->colors);
3379 			goto done;
3380 		}
3381 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3382 		    get_color_value("TOG_COLOR_DATE"));
3383 		if (err) {
3384 			free_colors(&s->colors);
3385 			goto done;
3386 		}
3387 	}
3388 
3389 	view->show = show_log_view;
3390 	view->input = input_log_view;
3391 	view->resize = resize_log_view;
3392 	view->close = close_log_view;
3393 	view->search_start = search_start_log_view;
3394 	view->search_next = search_next_log_view;
3395 
3396 	if (s->thread_args.pack_fds == NULL) {
3397 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3398 		if (err)
3399 			goto done;
3400 	}
3401 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3402 	    s->thread_args.pack_fds);
3403 	if (err)
3404 		goto done;
3405 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3406 	    !s->log_branches);
3407 	if (err)
3408 		goto done;
3409 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3410 	    s->repo, NULL, NULL);
3411 	if (err)
3412 		goto done;
3413 
3414 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3415 	if (errcode) {
3416 		err = got_error_set_errno(errcode, "pthread_cond_init");
3417 		goto done;
3418 	}
3419 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3420 	if (errcode) {
3421 		err = got_error_set_errno(errcode, "pthread_cond_init");
3422 		goto done;
3423 	}
3424 
3425 	s->thread_args.commits_needed = view->nlines;
3426 	s->thread_args.graph = thread_graph;
3427 	s->thread_args.real_commits = &s->real_commits;
3428 	s->thread_args.limit_commits = &s->limit_commits;
3429 	s->thread_args.in_repo_path = s->in_repo_path;
3430 	s->thread_args.start_id = s->start_id;
3431 	s->thread_args.repo = thread_repo;
3432 	s->thread_args.log_complete = 0;
3433 	s->thread_args.quit = &s->quit;
3434 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3435 	s->thread_args.selected_entry = &s->selected_entry;
3436 	s->thread_args.searching = &view->searching;
3437 	s->thread_args.search_next_done = &view->search_next_done;
3438 	s->thread_args.regex = &view->regex;
3439 	s->thread_args.limiting = &s->limit_view;
3440 	s->thread_args.limit_regex = &s->limit_regex;
3441 	s->thread_args.limit_commits = &s->limit_commits;
3442 done:
3443 	if (err)
3444 		close_log_view(view);
3445 	return err;
3446 }
3447 
3448 static const struct got_error *
3449 show_log_view(struct tog_view *view)
3450 {
3451 	const struct got_error *err;
3452 	struct tog_log_view_state *s = &view->state.log;
3453 
3454 	if (s->thread == NULL) {
3455 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3456 		    &s->thread_args);
3457 		if (errcode)
3458 			return got_error_set_errno(errcode, "pthread_create");
3459 		if (s->thread_args.commits_needed > 0) {
3460 			err = trigger_log_thread(view, 1);
3461 			if (err)
3462 				return err;
3463 		}
3464 	}
3465 
3466 	return draw_commits(view);
3467 }
3468 
3469 static void
3470 log_move_cursor_up(struct tog_view *view, int page, int home)
3471 {
3472 	struct tog_log_view_state *s = &view->state.log;
3473 
3474 	if (s->first_displayed_entry == NULL)
3475 		return;
3476 	if (s->selected_entry->idx == 0)
3477 		view->count = 0;
3478 
3479 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3480 	    || home)
3481 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3482 
3483 	if (!page && !home && s->selected > 0)
3484 		--s->selected;
3485 	else
3486 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3487 
3488 	select_commit(s);
3489 	return;
3490 }
3491 
3492 static const struct got_error *
3493 log_move_cursor_down(struct tog_view *view, int page)
3494 {
3495 	struct tog_log_view_state	*s = &view->state.log;
3496 	const struct got_error		*err = NULL;
3497 	int				 eos = view->nlines - 2;
3498 
3499 	if (s->first_displayed_entry == NULL)
3500 		return NULL;
3501 
3502 	if (s->thread_args.log_complete &&
3503 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3504 		return NULL;
3505 
3506 	if (view_is_hsplit_top(view))
3507 		--eos;  /* border consumes the last line */
3508 
3509 	if (!page) {
3510 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3511 			++s->selected;
3512 		else
3513 			err = log_scroll_down(view, 1);
3514 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3515 		struct commit_queue_entry *entry;
3516 		int n;
3517 
3518 		s->selected = 0;
3519 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3520 		s->last_displayed_entry = entry;
3521 		for (n = 0; n <= eos; n++) {
3522 			if (entry == NULL)
3523 				break;
3524 			s->first_displayed_entry = entry;
3525 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3526 		}
3527 		if (n > 0)
3528 			s->selected = n - 1;
3529 	} else {
3530 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3531 		    s->thread_args.log_complete)
3532 			s->selected += MIN(page,
3533 			    s->commits->ncommits - s->selected_entry->idx - 1);
3534 		else
3535 			err = log_scroll_down(view, page);
3536 	}
3537 	if (err)
3538 		return err;
3539 
3540 	/*
3541 	 * We might necessarily overshoot in horizontal
3542 	 * splits; if so, select the last displayed commit.
3543 	 */
3544 	if (s->first_displayed_entry && s->last_displayed_entry) {
3545 		s->selected = MIN(s->selected,
3546 		    s->last_displayed_entry->idx -
3547 		    s->first_displayed_entry->idx);
3548 	}
3549 
3550 	select_commit(s);
3551 
3552 	if (s->thread_args.log_complete &&
3553 	    s->selected_entry->idx == s->commits->ncommits - 1)
3554 		view->count = 0;
3555 
3556 	return NULL;
3557 }
3558 
3559 static void
3560 view_get_split(struct tog_view *view, int *y, int *x)
3561 {
3562 	*x = 0;
3563 	*y = 0;
3564 
3565 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3566 		if (view->child && view->child->resized_y)
3567 			*y = view->child->resized_y;
3568 		else if (view->resized_y)
3569 			*y = view->resized_y;
3570 		else
3571 			*y = view_split_begin_y(view->lines);
3572 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3573 		if (view->child && view->child->resized_x)
3574 			*x = view->child->resized_x;
3575 		else if (view->resized_x)
3576 			*x = view->resized_x;
3577 		else
3578 			*x = view_split_begin_x(view->begin_x);
3579 	}
3580 }
3581 
3582 /* Split view horizontally at y and offset view->state->selected line. */
3583 static const struct got_error *
3584 view_init_hsplit(struct tog_view *view, int y)
3585 {
3586 	const struct got_error *err = NULL;
3587 
3588 	view->nlines = y;
3589 	view->ncols = COLS;
3590 	err = view_resize(view);
3591 	if (err)
3592 		return err;
3593 
3594 	err = offset_selection_down(view);
3595 
3596 	return err;
3597 }
3598 
3599 static const struct got_error *
3600 log_goto_line(struct tog_view *view, int nlines)
3601 {
3602 	const struct got_error		*err = NULL;
3603 	struct tog_log_view_state	*s = &view->state.log;
3604 	int				 g, idx = s->selected_entry->idx;
3605 
3606 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3607 		return NULL;
3608 
3609 	g = view->gline;
3610 	view->gline = 0;
3611 
3612 	if (g >= s->first_displayed_entry->idx + 1 &&
3613 	    g <= s->last_displayed_entry->idx + 1 &&
3614 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3615 		s->selected = g - s->first_displayed_entry->idx - 1;
3616 		select_commit(s);
3617 		return NULL;
3618 	}
3619 
3620 	if (idx + 1 < g) {
3621 		err = log_move_cursor_down(view, g - idx - 1);
3622 		if (!err && g > s->selected_entry->idx + 1)
3623 			err = log_move_cursor_down(view,
3624 			    g - s->first_displayed_entry->idx - 1);
3625 		if (err)
3626 			return err;
3627 	} else if (idx + 1 > g)
3628 		log_move_cursor_up(view, idx - g + 1, 0);
3629 
3630 	if (g < nlines && s->first_displayed_entry->idx == 0)
3631 		s->selected = g - 1;
3632 
3633 	select_commit(s);
3634 	return NULL;
3635 
3636 }
3637 
3638 static const struct got_error *
3639 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3640 {
3641 	const struct got_error *err = NULL;
3642 	struct tog_log_view_state *s = &view->state.log;
3643 	int eos, nscroll;
3644 
3645 	if (s->thread_args.load_all) {
3646 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3647 			s->thread_args.load_all = 0;
3648 		else if (s->thread_args.log_complete) {
3649 			err = log_move_cursor_down(view, s->commits->ncommits);
3650 			s->thread_args.load_all = 0;
3651 		}
3652 		if (err)
3653 			return err;
3654 	}
3655 
3656 	eos = nscroll = view->nlines - 1;
3657 	if (view_is_hsplit_top(view))
3658 		--eos;  /* border */
3659 
3660 	if (view->gline)
3661 		return log_goto_line(view, eos);
3662 
3663 	switch (ch) {
3664 	case '&':
3665 		err = limit_log_view(view);
3666 		break;
3667 	case 'q':
3668 		s->quit = 1;
3669 		break;
3670 	case '0':
3671 		view->x = 0;
3672 		break;
3673 	case '$':
3674 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3675 		view->count = 0;
3676 		break;
3677 	case KEY_RIGHT:
3678 	case 'l':
3679 		if (view->x + view->ncols / 2 < view->maxx)
3680 			view->x += 2;  /* move two columns right */
3681 		else
3682 			view->count = 0;
3683 		break;
3684 	case KEY_LEFT:
3685 	case 'h':
3686 		view->x -= MIN(view->x, 2);  /* move two columns back */
3687 		if (view->x <= 0)
3688 			view->count = 0;
3689 		break;
3690 	case 'k':
3691 	case KEY_UP:
3692 	case '<':
3693 	case ',':
3694 	case CTRL('p'):
3695 		log_move_cursor_up(view, 0, 0);
3696 		break;
3697 	case 'g':
3698 	case '=':
3699 	case KEY_HOME:
3700 		log_move_cursor_up(view, 0, 1);
3701 		view->count = 0;
3702 		break;
3703 	case CTRL('u'):
3704 	case 'u':
3705 		nscroll /= 2;
3706 		/* FALL THROUGH */
3707 	case KEY_PPAGE:
3708 	case CTRL('b'):
3709 	case 'b':
3710 		log_move_cursor_up(view, nscroll, 0);
3711 		break;
3712 	case 'j':
3713 	case KEY_DOWN:
3714 	case '>':
3715 	case '.':
3716 	case CTRL('n'):
3717 		err = log_move_cursor_down(view, 0);
3718 		break;
3719 	case '@':
3720 		s->use_committer = !s->use_committer;
3721 		break;
3722 	case 'G':
3723 	case '*':
3724 	case KEY_END: {
3725 		/* We don't know yet how many commits, so we're forced to
3726 		 * traverse them all. */
3727 		view->count = 0;
3728 		s->thread_args.load_all = 1;
3729 		if (!s->thread_args.log_complete)
3730 			return trigger_log_thread(view, 0);
3731 		err = log_move_cursor_down(view, s->commits->ncommits);
3732 		s->thread_args.load_all = 0;
3733 		break;
3734 	}
3735 	case CTRL('d'):
3736 	case 'd':
3737 		nscroll /= 2;
3738 		/* FALL THROUGH */
3739 	case KEY_NPAGE:
3740 	case CTRL('f'):
3741 	case 'f':
3742 	case ' ':
3743 		err = log_move_cursor_down(view, nscroll);
3744 		break;
3745 	case KEY_RESIZE:
3746 		if (s->selected > view->nlines - 2)
3747 			s->selected = view->nlines - 2;
3748 		if (s->selected > s->commits->ncommits - 1)
3749 			s->selected = s->commits->ncommits - 1;
3750 		select_commit(s);
3751 		if (s->commits->ncommits < view->nlines - 1 &&
3752 		    !s->thread_args.log_complete) {
3753 			s->thread_args.commits_needed += (view->nlines - 1) -
3754 			    s->commits->ncommits;
3755 			err = trigger_log_thread(view, 1);
3756 		}
3757 		break;
3758 	case KEY_ENTER:
3759 	case '\r':
3760 		view->count = 0;
3761 		if (s->selected_entry == NULL)
3762 			break;
3763 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3764 		break;
3765 	case 'T':
3766 		view->count = 0;
3767 		if (s->selected_entry == NULL)
3768 			break;
3769 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3770 		break;
3771 	case KEY_BACKSPACE:
3772 	case CTRL('l'):
3773 	case 'B':
3774 		view->count = 0;
3775 		if (ch == KEY_BACKSPACE &&
3776 		    got_path_is_root_dir(s->in_repo_path))
3777 			break;
3778 		err = stop_log_thread(s);
3779 		if (err)
3780 			return err;
3781 		if (ch == KEY_BACKSPACE) {
3782 			char *parent_path;
3783 			err = got_path_dirname(&parent_path, s->in_repo_path);
3784 			if (err)
3785 				return err;
3786 			free(s->in_repo_path);
3787 			s->in_repo_path = parent_path;
3788 			s->thread_args.in_repo_path = s->in_repo_path;
3789 		} else if (ch == CTRL('l')) {
3790 			struct got_object_id *start_id;
3791 			err = got_repo_match_object_id(&start_id, NULL,
3792 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3793 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3794 			if (err) {
3795 				if (s->head_ref_name == NULL ||
3796 				    err->code != GOT_ERR_NOT_REF)
3797 					return err;
3798 				/* Try to cope with deleted references. */
3799 				free(s->head_ref_name);
3800 				s->head_ref_name = NULL;
3801 				err = got_repo_match_object_id(&start_id,
3802 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3803 				    &tog_refs, s->repo);
3804 				if (err)
3805 					return err;
3806 			}
3807 			free(s->start_id);
3808 			s->start_id = start_id;
3809 			s->thread_args.start_id = s->start_id;
3810 		} else /* 'B' */
3811 			s->log_branches = !s->log_branches;
3812 
3813 		if (s->thread_args.pack_fds == NULL) {
3814 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3815 			if (err)
3816 				return err;
3817 		}
3818 		err = got_repo_open(&s->thread_args.repo,
3819 		    got_repo_get_path(s->repo), NULL,
3820 		    s->thread_args.pack_fds);
3821 		if (err)
3822 			return err;
3823 		tog_free_refs();
3824 		err = tog_load_refs(s->repo, 0);
3825 		if (err)
3826 			return err;
3827 		err = got_commit_graph_open(&s->thread_args.graph,
3828 		    s->in_repo_path, !s->log_branches);
3829 		if (err)
3830 			return err;
3831 		err = got_commit_graph_iter_start(s->thread_args.graph,
3832 		    s->start_id, s->repo, NULL, NULL);
3833 		if (err)
3834 			return err;
3835 		free_commits(&s->real_commits);
3836 		free_commits(&s->limit_commits);
3837 		s->first_displayed_entry = NULL;
3838 		s->last_displayed_entry = NULL;
3839 		s->selected_entry = NULL;
3840 		s->selected = 0;
3841 		s->thread_args.log_complete = 0;
3842 		s->quit = 0;
3843 		s->thread_args.commits_needed = view->lines;
3844 		s->matched_entry = NULL;
3845 		s->search_entry = NULL;
3846 		view->offset = 0;
3847 		break;
3848 	case 'R':
3849 		view->count = 0;
3850 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3851 		break;
3852 	default:
3853 		view->count = 0;
3854 		break;
3855 	}
3856 
3857 	return err;
3858 }
3859 
3860 static const struct got_error *
3861 apply_unveil(const char *repo_path, const char *worktree_path)
3862 {
3863 	const struct got_error *error;
3864 
3865 #ifdef PROFILE
3866 	if (unveil("gmon.out", "rwc") != 0)
3867 		return got_error_from_errno2("unveil", "gmon.out");
3868 #endif
3869 	if (repo_path && unveil(repo_path, "r") != 0)
3870 		return got_error_from_errno2("unveil", repo_path);
3871 
3872 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3873 		return got_error_from_errno2("unveil", worktree_path);
3874 
3875 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3876 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3877 
3878 	error = got_privsep_unveil_exec_helpers();
3879 	if (error != NULL)
3880 		return error;
3881 
3882 	if (unveil(NULL, NULL) != 0)
3883 		return got_error_from_errno("unveil");
3884 
3885 	return NULL;
3886 }
3887 
3888 static void
3889 init_curses(void)
3890 {
3891 	/*
3892 	 * Override default signal handlers before starting ncurses.
3893 	 * This should prevent ncurses from installing its own
3894 	 * broken cleanup() signal handler.
3895 	 */
3896 	signal(SIGWINCH, tog_sigwinch);
3897 	signal(SIGPIPE, tog_sigpipe);
3898 	signal(SIGCONT, tog_sigcont);
3899 	signal(SIGINT, tog_sigint);
3900 	signal(SIGTERM, tog_sigterm);
3901 
3902 	initscr();
3903 	cbreak();
3904 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3905 	noecho();
3906 	nonl();
3907 	intrflush(stdscr, FALSE);
3908 	keypad(stdscr, TRUE);
3909 	curs_set(0);
3910 	if (getenv("TOG_COLORS") != NULL) {
3911 		start_color();
3912 		use_default_colors();
3913 	}
3914 }
3915 
3916 static const struct got_error *
3917 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3918     struct got_repository *repo, struct got_worktree *worktree)
3919 {
3920 	const struct got_error *err = NULL;
3921 
3922 	if (argc == 0) {
3923 		*in_repo_path = strdup("/");
3924 		if (*in_repo_path == NULL)
3925 			return got_error_from_errno("strdup");
3926 		return NULL;
3927 	}
3928 
3929 	if (worktree) {
3930 		const char *prefix = got_worktree_get_path_prefix(worktree);
3931 		char *p;
3932 
3933 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3934 		if (err)
3935 			return err;
3936 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3937 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3938 		    p) == -1) {
3939 			err = got_error_from_errno("asprintf");
3940 			*in_repo_path = NULL;
3941 		}
3942 		free(p);
3943 	} else
3944 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3945 
3946 	return err;
3947 }
3948 
3949 static const struct got_error *
3950 cmd_log(int argc, char *argv[])
3951 {
3952 	const struct got_error *error;
3953 	struct got_repository *repo = NULL;
3954 	struct got_worktree *worktree = NULL;
3955 	struct got_object_id *start_id = NULL;
3956 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3957 	char *start_commit = NULL, *label = NULL;
3958 	struct got_reference *ref = NULL;
3959 	const char *head_ref_name = NULL;
3960 	int ch, log_branches = 0;
3961 	struct tog_view *view;
3962 	int *pack_fds = NULL;
3963 
3964 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3965 		switch (ch) {
3966 		case 'b':
3967 			log_branches = 1;
3968 			break;
3969 		case 'c':
3970 			start_commit = optarg;
3971 			break;
3972 		case 'r':
3973 			repo_path = realpath(optarg, NULL);
3974 			if (repo_path == NULL)
3975 				return got_error_from_errno2("realpath",
3976 				    optarg);
3977 			break;
3978 		default:
3979 			usage_log();
3980 			/* NOTREACHED */
3981 		}
3982 	}
3983 
3984 	argc -= optind;
3985 	argv += optind;
3986 
3987 	if (argc > 1)
3988 		usage_log();
3989 
3990 	error = got_repo_pack_fds_open(&pack_fds);
3991 	if (error != NULL)
3992 		goto done;
3993 
3994 	if (repo_path == NULL) {
3995 		cwd = getcwd(NULL, 0);
3996 		if (cwd == NULL)
3997 			return got_error_from_errno("getcwd");
3998 		error = got_worktree_open(&worktree, cwd);
3999 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4000 			goto done;
4001 		if (worktree)
4002 			repo_path =
4003 			    strdup(got_worktree_get_repo_path(worktree));
4004 		else
4005 			repo_path = strdup(cwd);
4006 		if (repo_path == NULL) {
4007 			error = got_error_from_errno("strdup");
4008 			goto done;
4009 		}
4010 	}
4011 
4012 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4013 	if (error != NULL)
4014 		goto done;
4015 
4016 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4017 	    repo, worktree);
4018 	if (error)
4019 		goto done;
4020 
4021 	init_curses();
4022 
4023 	error = apply_unveil(got_repo_get_path(repo),
4024 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4025 	if (error)
4026 		goto done;
4027 
4028 	/* already loaded by tog_log_with_path()? */
4029 	if (TAILQ_EMPTY(&tog_refs)) {
4030 		error = tog_load_refs(repo, 0);
4031 		if (error)
4032 			goto done;
4033 	}
4034 
4035 	if (start_commit == NULL) {
4036 		error = got_repo_match_object_id(&start_id, &label,
4037 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4038 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4039 		if (error)
4040 			goto done;
4041 		head_ref_name = label;
4042 	} else {
4043 		error = got_ref_open(&ref, repo, start_commit, 0);
4044 		if (error == NULL)
4045 			head_ref_name = got_ref_get_name(ref);
4046 		else if (error->code != GOT_ERR_NOT_REF)
4047 			goto done;
4048 		error = got_repo_match_object_id(&start_id, NULL,
4049 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4050 		if (error)
4051 			goto done;
4052 	}
4053 
4054 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4055 	if (view == NULL) {
4056 		error = got_error_from_errno("view_open");
4057 		goto done;
4058 	}
4059 	error = open_log_view(view, start_id, repo, head_ref_name,
4060 	    in_repo_path, log_branches);
4061 	if (error)
4062 		goto done;
4063 	if (worktree) {
4064 		/* Release work tree lock. */
4065 		got_worktree_close(worktree);
4066 		worktree = NULL;
4067 	}
4068 	error = view_loop(view);
4069 done:
4070 	free(in_repo_path);
4071 	free(repo_path);
4072 	free(cwd);
4073 	free(start_id);
4074 	free(label);
4075 	if (ref)
4076 		got_ref_close(ref);
4077 	if (repo) {
4078 		const struct got_error *close_err = got_repo_close(repo);
4079 		if (error == NULL)
4080 			error = close_err;
4081 	}
4082 	if (worktree)
4083 		got_worktree_close(worktree);
4084 	if (pack_fds) {
4085 		const struct got_error *pack_err =
4086 		    got_repo_pack_fds_close(pack_fds);
4087 		if (error == NULL)
4088 			error = pack_err;
4089 	}
4090 	tog_free_refs();
4091 	return error;
4092 }
4093 
4094 __dead static void
4095 usage_diff(void)
4096 {
4097 	endwin();
4098 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4099 	    "object1 object2\n", getprogname());
4100 	exit(1);
4101 }
4102 
4103 static int
4104 match_line(const char *line, regex_t *regex, size_t nmatch,
4105     regmatch_t *regmatch)
4106 {
4107 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4108 }
4109 
4110 static struct tog_color *
4111 match_color(struct tog_colors *colors, const char *line)
4112 {
4113 	struct tog_color *tc = NULL;
4114 
4115 	STAILQ_FOREACH(tc, colors, entry) {
4116 		if (match_line(line, &tc->regex, 0, NULL))
4117 			return tc;
4118 	}
4119 
4120 	return NULL;
4121 }
4122 
4123 static const struct got_error *
4124 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4125     WINDOW *window, int skipcol, regmatch_t *regmatch)
4126 {
4127 	const struct got_error *err = NULL;
4128 	char *exstr = NULL;
4129 	wchar_t *wline = NULL;
4130 	int rme, rms, n, width, scrollx;
4131 	int width0 = 0, width1 = 0, width2 = 0;
4132 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4133 
4134 	*wtotal = 0;
4135 
4136 	rms = regmatch->rm_so;
4137 	rme = regmatch->rm_eo;
4138 
4139 	err = expand_tab(&exstr, line);
4140 	if (err)
4141 		return err;
4142 
4143 	/* Split the line into 3 segments, according to match offsets. */
4144 	seg0 = strndup(exstr, rms);
4145 	if (seg0 == NULL) {
4146 		err = got_error_from_errno("strndup");
4147 		goto done;
4148 	}
4149 	seg1 = strndup(exstr + rms, rme - rms);
4150 	if (seg1 == NULL) {
4151 		err = got_error_from_errno("strndup");
4152 		goto done;
4153 	}
4154 	seg2 = strdup(exstr + rme);
4155 	if (seg2 == NULL) {
4156 		err = got_error_from_errno("strndup");
4157 		goto done;
4158 	}
4159 
4160 	/* draw up to matched token if we haven't scrolled past it */
4161 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4162 	    col_tab_align, 1);
4163 	if (err)
4164 		goto done;
4165 	n = MAX(width0 - skipcol, 0);
4166 	if (n) {
4167 		free(wline);
4168 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4169 		    wlimit, col_tab_align, 1);
4170 		if (err)
4171 			goto done;
4172 		waddwstr(window, &wline[scrollx]);
4173 		wlimit -= width;
4174 		*wtotal += width;
4175 	}
4176 
4177 	if (wlimit > 0) {
4178 		int i = 0, w = 0;
4179 		size_t wlen;
4180 
4181 		free(wline);
4182 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4183 		    col_tab_align, 1);
4184 		if (err)
4185 			goto done;
4186 		wlen = wcslen(wline);
4187 		while (i < wlen) {
4188 			width = wcwidth(wline[i]);
4189 			if (width == -1) {
4190 				/* should not happen, tabs are expanded */
4191 				err = got_error(GOT_ERR_RANGE);
4192 				goto done;
4193 			}
4194 			if (width0 + w + width > skipcol)
4195 				break;
4196 			w += width;
4197 			i++;
4198 		}
4199 		/* draw (visible part of) matched token (if scrolled into it) */
4200 		if (width1 - w > 0) {
4201 			wattron(window, A_STANDOUT);
4202 			waddwstr(window, &wline[i]);
4203 			wattroff(window, A_STANDOUT);
4204 			wlimit -= (width1 - w);
4205 			*wtotal += (width1 - w);
4206 		}
4207 	}
4208 
4209 	if (wlimit > 0) {  /* draw rest of line */
4210 		free(wline);
4211 		if (skipcol > width0 + width1) {
4212 			err = format_line(&wline, &width2, &scrollx, seg2,
4213 			    skipcol - (width0 + width1), wlimit,
4214 			    col_tab_align, 1);
4215 			if (err)
4216 				goto done;
4217 			waddwstr(window, &wline[scrollx]);
4218 		} else {
4219 			err = format_line(&wline, &width2, NULL, seg2, 0,
4220 			    wlimit, col_tab_align, 1);
4221 			if (err)
4222 				goto done;
4223 			waddwstr(window, wline);
4224 		}
4225 		*wtotal += width2;
4226 	}
4227 done:
4228 	free(wline);
4229 	free(exstr);
4230 	free(seg0);
4231 	free(seg1);
4232 	free(seg2);
4233 	return err;
4234 }
4235 
4236 static int
4237 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4238 {
4239 	FILE	*f = NULL;
4240 	int	*eof, *first, *selected;
4241 
4242 	if (view->type == TOG_VIEW_DIFF) {
4243 		struct tog_diff_view_state *s = &view->state.diff;
4244 
4245 		first = &s->first_displayed_line;
4246 		selected = first;
4247 		eof = &s->eof;
4248 		f = s->f;
4249 	} else if (view->type == TOG_VIEW_HELP) {
4250 		struct tog_help_view_state *s = &view->state.help;
4251 
4252 		first = &s->first_displayed_line;
4253 		selected = first;
4254 		eof = &s->eof;
4255 		f = s->f;
4256 	} else if (view->type == TOG_VIEW_BLAME) {
4257 		struct tog_blame_view_state *s = &view->state.blame;
4258 
4259 		first = &s->first_displayed_line;
4260 		selected = &s->selected_line;
4261 		eof = &s->eof;
4262 		f = s->blame.f;
4263 	} else
4264 		return 0;
4265 
4266 	/* Center gline in the middle of the page like vi(1). */
4267 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4268 		return 0;
4269 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4270 		rewind(f);
4271 		*eof = 0;
4272 		*first = 1;
4273 		*lineno = 0;
4274 		*nprinted = 0;
4275 		return 0;
4276 	}
4277 
4278 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4279 		view->gline : (view->nlines - 3) / 2 + 1;
4280 	view->gline = 0;
4281 
4282 	return 1;
4283 }
4284 
4285 static const struct got_error *
4286 draw_file(struct tog_view *view, const char *header)
4287 {
4288 	struct tog_diff_view_state *s = &view->state.diff;
4289 	regmatch_t *regmatch = &view->regmatch;
4290 	const struct got_error *err;
4291 	int nprinted = 0;
4292 	char *line;
4293 	size_t linesize = 0;
4294 	ssize_t linelen;
4295 	wchar_t *wline;
4296 	int width;
4297 	int max_lines = view->nlines;
4298 	int nlines = s->nlines;
4299 	off_t line_offset;
4300 
4301 	s->lineno = s->first_displayed_line - 1;
4302 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4303 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4304 		return got_error_from_errno("fseek");
4305 
4306 	werase(view->window);
4307 
4308 	if (view->gline > s->nlines - 1)
4309 		view->gline = s->nlines - 1;
4310 
4311 	if (header) {
4312 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4313 		    1 : view->gline - (view->nlines - 3) / 2 :
4314 		    s->lineno + s->selected_line;
4315 
4316 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4317 			return got_error_from_errno("asprintf");
4318 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4319 		    0, 0);
4320 		free(line);
4321 		if (err)
4322 			return err;
4323 
4324 		if (view_needs_focus_indication(view))
4325 			wstandout(view->window);
4326 		waddwstr(view->window, wline);
4327 		free(wline);
4328 		wline = NULL;
4329 		while (width++ < view->ncols)
4330 			waddch(view->window, ' ');
4331 		if (view_needs_focus_indication(view))
4332 			wstandend(view->window);
4333 
4334 		if (max_lines <= 1)
4335 			return NULL;
4336 		max_lines--;
4337 	}
4338 
4339 	s->eof = 0;
4340 	view->maxx = 0;
4341 	line = NULL;
4342 	while (max_lines > 0 && nprinted < max_lines) {
4343 		enum got_diff_line_type linetype;
4344 		attr_t attr = 0;
4345 
4346 		linelen = getline(&line, &linesize, s->f);
4347 		if (linelen == -1) {
4348 			if (feof(s->f)) {
4349 				s->eof = 1;
4350 				break;
4351 			}
4352 			free(line);
4353 			return got_ferror(s->f, GOT_ERR_IO);
4354 		}
4355 
4356 		if (++s->lineno < s->first_displayed_line)
4357 			continue;
4358 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4359 			continue;
4360 		if (s->lineno == view->hiline)
4361 			attr = A_STANDOUT;
4362 
4363 		/* Set view->maxx based on full line length. */
4364 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4365 		    view->x ? 1 : 0);
4366 		if (err) {
4367 			free(line);
4368 			return err;
4369 		}
4370 		view->maxx = MAX(view->maxx, width);
4371 		free(wline);
4372 		wline = NULL;
4373 
4374 		linetype = s->lines[s->lineno].type;
4375 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4376 		    linetype < GOT_DIFF_LINE_CONTEXT)
4377 			attr |= COLOR_PAIR(linetype);
4378 		if (attr)
4379 			wattron(view->window, attr);
4380 		if (s->first_displayed_line + nprinted == s->matched_line &&
4381 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4382 			err = add_matched_line(&width, line, view->ncols, 0,
4383 			    view->window, view->x, regmatch);
4384 			if (err) {
4385 				free(line);
4386 				return err;
4387 			}
4388 		} else {
4389 			int skip;
4390 			err = format_line(&wline, &width, &skip, line,
4391 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4392 			if (err) {
4393 				free(line);
4394 				return err;
4395 			}
4396 			waddwstr(view->window, &wline[skip]);
4397 			free(wline);
4398 			wline = NULL;
4399 		}
4400 		if (s->lineno == view->hiline) {
4401 			/* highlight full gline length */
4402 			while (width++ < view->ncols)
4403 				waddch(view->window, ' ');
4404 		} else {
4405 			if (width <= view->ncols - 1)
4406 				waddch(view->window, '\n');
4407 		}
4408 		if (attr)
4409 			wattroff(view->window, attr);
4410 		if (++nprinted == 1)
4411 			s->first_displayed_line = s->lineno;
4412 	}
4413 	free(line);
4414 	if (nprinted >= 1)
4415 		s->last_displayed_line = s->first_displayed_line +
4416 		    (nprinted - 1);
4417 	else
4418 		s->last_displayed_line = s->first_displayed_line;
4419 
4420 	view_border(view);
4421 
4422 	if (s->eof) {
4423 		while (nprinted < view->nlines) {
4424 			waddch(view->window, '\n');
4425 			nprinted++;
4426 		}
4427 
4428 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4429 		    view->ncols, 0, 0);
4430 		if (err) {
4431 			return err;
4432 		}
4433 
4434 		wstandout(view->window);
4435 		waddwstr(view->window, wline);
4436 		free(wline);
4437 		wline = NULL;
4438 		wstandend(view->window);
4439 	}
4440 
4441 	return NULL;
4442 }
4443 
4444 static char *
4445 get_datestr(time_t *time, char *datebuf)
4446 {
4447 	struct tm mytm, *tm;
4448 	char *p, *s;
4449 
4450 	tm = gmtime_r(time, &mytm);
4451 	if (tm == NULL)
4452 		return NULL;
4453 	s = asctime_r(tm, datebuf);
4454 	if (s == NULL)
4455 		return NULL;
4456 	p = strchr(s, '\n');
4457 	if (p)
4458 		*p = '\0';
4459 	return s;
4460 }
4461 
4462 static const struct got_error *
4463 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4464     off_t off, uint8_t type)
4465 {
4466 	struct got_diff_line *p;
4467 
4468 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4469 	if (p == NULL)
4470 		return got_error_from_errno("reallocarray");
4471 	*lines = p;
4472 	(*lines)[*nlines].offset = off;
4473 	(*lines)[*nlines].type = type;
4474 	(*nlines)++;
4475 
4476 	return NULL;
4477 }
4478 
4479 static const struct got_error *
4480 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4481     struct got_diff_line *s_lines, size_t s_nlines)
4482 {
4483 	struct got_diff_line	*p;
4484 	char			 buf[BUFSIZ];
4485 	size_t			 i, r;
4486 
4487 	if (fseeko(src, 0L, SEEK_SET) == -1)
4488 		return got_error_from_errno("fseeko");
4489 
4490 	for (;;) {
4491 		r = fread(buf, 1, sizeof(buf), src);
4492 		if (r == 0) {
4493 			if (ferror(src))
4494 				return got_error_from_errno("fread");
4495 			if (feof(src))
4496 				break;
4497 		}
4498 		if (fwrite(buf, 1, r, dst) != r)
4499 			return got_ferror(dst, GOT_ERR_IO);
4500 	}
4501 
4502 	/*
4503 	 * The diff driver initialises the first line at offset zero when the
4504 	 * array isn't prepopulated, skip it; we already have it in *d_lines.
4505 	 */
4506 	for (i = 1; i < s_nlines; ++i)
4507 		s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4508 
4509 	--s_nlines;
4510 
4511 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4512 	if (p == NULL) {
4513 		/* d_lines is freed in close_diff_view() */
4514 		return got_error_from_errno("reallocarray");
4515 	}
4516 
4517 	*d_lines = p;
4518 
4519 	memcpy(*d_lines + *d_nlines, s_lines + 1, s_nlines * sizeof(*s_lines));
4520 	*d_nlines += s_nlines;
4521 
4522 	return NULL;
4523 }
4524 
4525 static const struct got_error *
4526 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4527     struct got_object_id *commit_id, struct got_reflist_head *refs,
4528     struct got_repository *repo, int ignore_ws, int force_text_diff,
4529     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4530 {
4531 	const struct got_error *err = NULL;
4532 	char datebuf[26], *datestr;
4533 	struct got_commit_object *commit;
4534 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4535 	time_t committer_time;
4536 	const char *author, *committer;
4537 	char *refs_str = NULL;
4538 	struct got_pathlist_entry *pe;
4539 	off_t outoff = 0;
4540 	int n;
4541 
4542 	if (refs) {
4543 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4544 		if (err)
4545 			return err;
4546 	}
4547 
4548 	err = got_object_open_as_commit(&commit, repo, commit_id);
4549 	if (err)
4550 		return err;
4551 
4552 	err = got_object_id_str(&id_str, commit_id);
4553 	if (err) {
4554 		err = got_error_from_errno("got_object_id_str");
4555 		goto done;
4556 	}
4557 
4558 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4559 	if (err)
4560 		goto done;
4561 
4562 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4563 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4564 	if (n < 0) {
4565 		err = got_error_from_errno("fprintf");
4566 		goto done;
4567 	}
4568 	outoff += n;
4569 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4570 	if (err)
4571 		goto done;
4572 
4573 	n = fprintf(outfile, "from: %s\n",
4574 	    got_object_commit_get_author(commit));
4575 	if (n < 0) {
4576 		err = got_error_from_errno("fprintf");
4577 		goto done;
4578 	}
4579 	outoff += n;
4580 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4581 	if (err)
4582 		goto done;
4583 
4584 	author = got_object_commit_get_author(commit);
4585 	committer = got_object_commit_get_committer(commit);
4586 	if (strcmp(author, committer) != 0) {
4587 		n = fprintf(outfile, "via: %s\n", committer);
4588 		if (n < 0) {
4589 			err = got_error_from_errno("fprintf");
4590 			goto done;
4591 		}
4592 		outoff += n;
4593 		err = add_line_metadata(lines, nlines, outoff,
4594 		    GOT_DIFF_LINE_AUTHOR);
4595 		if (err)
4596 			goto done;
4597 	}
4598 	committer_time = got_object_commit_get_committer_time(commit);
4599 	datestr = get_datestr(&committer_time, datebuf);
4600 	if (datestr) {
4601 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4602 		if (n < 0) {
4603 			err = got_error_from_errno("fprintf");
4604 			goto done;
4605 		}
4606 		outoff += n;
4607 		err = add_line_metadata(lines, nlines, outoff,
4608 		    GOT_DIFF_LINE_DATE);
4609 		if (err)
4610 			goto done;
4611 	}
4612 	if (got_object_commit_get_nparents(commit) > 1) {
4613 		const struct got_object_id_queue *parent_ids;
4614 		struct got_object_qid *qid;
4615 		int pn = 1;
4616 		parent_ids = got_object_commit_get_parent_ids(commit);
4617 		STAILQ_FOREACH(qid, parent_ids, entry) {
4618 			err = got_object_id_str(&id_str, &qid->id);
4619 			if (err)
4620 				goto done;
4621 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4622 			if (n < 0) {
4623 				err = got_error_from_errno("fprintf");
4624 				goto done;
4625 			}
4626 			outoff += n;
4627 			err = add_line_metadata(lines, nlines, outoff,
4628 			    GOT_DIFF_LINE_META);
4629 			if (err)
4630 				goto done;
4631 			free(id_str);
4632 			id_str = NULL;
4633 		}
4634 	}
4635 
4636 	err = got_object_commit_get_logmsg(&logmsg, commit);
4637 	if (err)
4638 		goto done;
4639 	s = logmsg;
4640 	while ((line = strsep(&s, "\n")) != NULL) {
4641 		n = fprintf(outfile, "%s\n", line);
4642 		if (n < 0) {
4643 			err = got_error_from_errno("fprintf");
4644 			goto done;
4645 		}
4646 		outoff += n;
4647 		err = add_line_metadata(lines, nlines, outoff,
4648 		    GOT_DIFF_LINE_LOGMSG);
4649 		if (err)
4650 			goto done;
4651 	}
4652 
4653 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4654 		struct got_diff_changed_path *cp = pe->data;
4655 		int pad = dsa->max_path_len - pe->path_len + 1;
4656 
4657 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4658 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4659 		    dsa->rm_cols + 1, cp->rm);
4660 		if (n < 0) {
4661 			err = got_error_from_errno("fprintf");
4662 			goto done;
4663 		}
4664 		outoff += n;
4665 		err = add_line_metadata(lines, nlines, outoff,
4666 		    GOT_DIFF_LINE_CHANGES);
4667 		if (err)
4668 			goto done;
4669 	}
4670 
4671 	fputc('\n', outfile);
4672 	outoff++;
4673 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4674 	if (err)
4675 		goto done;
4676 
4677 	n = fprintf(outfile,
4678 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4679 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4680 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4681 	if (n < 0) {
4682 		err = got_error_from_errno("fprintf");
4683 		goto done;
4684 	}
4685 	outoff += n;
4686 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4687 	if (err)
4688 		goto done;
4689 
4690 	fputc('\n', outfile);
4691 	outoff++;
4692 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4693 done:
4694 	free(id_str);
4695 	free(logmsg);
4696 	free(refs_str);
4697 	got_object_commit_close(commit);
4698 	if (err) {
4699 		free(*lines);
4700 		*lines = NULL;
4701 		*nlines = 0;
4702 	}
4703 	return err;
4704 }
4705 
4706 static const struct got_error *
4707 create_diff(struct tog_diff_view_state *s)
4708 {
4709 	const struct got_error *err = NULL;
4710 	FILE *f = NULL, *tmp_diff_file = NULL;
4711 	int obj_type;
4712 	struct got_diff_line *lines = NULL;
4713 	struct got_pathlist_head changed_paths;
4714 
4715 	TAILQ_INIT(&changed_paths);
4716 
4717 	free(s->lines);
4718 	s->lines = malloc(sizeof(*s->lines));
4719 	if (s->lines == NULL)
4720 		return got_error_from_errno("malloc");
4721 	s->nlines = 0;
4722 
4723 	f = got_opentemp();
4724 	if (f == NULL) {
4725 		err = got_error_from_errno("got_opentemp");
4726 		goto done;
4727 	}
4728 	tmp_diff_file = got_opentemp();
4729 	if (tmp_diff_file == NULL) {
4730 		err = got_error_from_errno("got_opentemp");
4731 		goto done;
4732 	}
4733 	if (s->f && fclose(s->f) == EOF) {
4734 		err = got_error_from_errno("fclose");
4735 		goto done;
4736 	}
4737 	s->f = f;
4738 
4739 	if (s->id1)
4740 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4741 	else
4742 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4743 	if (err)
4744 		goto done;
4745 
4746 	switch (obj_type) {
4747 	case GOT_OBJ_TYPE_BLOB:
4748 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4749 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4750 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4751 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4752 		    s->f);
4753 		break;
4754 	case GOT_OBJ_TYPE_TREE:
4755 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4756 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4757 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4758 		    s->force_text_diff, NULL, s->repo, s->f);
4759 		break;
4760 	case GOT_OBJ_TYPE_COMMIT: {
4761 		const struct got_object_id_queue *parent_ids;
4762 		struct got_object_qid *pid;
4763 		struct got_commit_object *commit2;
4764 		struct got_reflist_head *refs;
4765 		size_t nlines = 0;
4766 		struct got_diffstat_cb_arg dsa = {
4767 			0, 0, 0, 0, 0, 0,
4768 			&changed_paths,
4769 			s->ignore_whitespace,
4770 			s->force_text_diff,
4771 			tog_diff_algo
4772 		};
4773 
4774 		lines = malloc(sizeof(*lines));
4775 		if (lines == NULL) {
4776 			err = got_error_from_errno("malloc");
4777 			goto done;
4778 		}
4779 
4780 		/* build diff first in tmp file then append to commit info */
4781 		err = got_diff_objects_as_commits(&lines, &nlines,
4782 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4783 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4784 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4785 		if (err)
4786 			break;
4787 
4788 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4789 		if (err)
4790 			goto done;
4791 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4792 		/* Show commit info if we're diffing to a parent/root commit. */
4793 		if (s->id1 == NULL) {
4794 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4795 			    refs, s->repo, s->ignore_whitespace,
4796 			    s->force_text_diff, &dsa, s->f);
4797 			if (err)
4798 				goto done;
4799 		} else {
4800 			parent_ids = got_object_commit_get_parent_ids(commit2);
4801 			STAILQ_FOREACH(pid, parent_ids, entry) {
4802 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4803 					err = write_commit_info(&s->lines,
4804 					    &s->nlines, s->id2, refs, s->repo,
4805 					    s->ignore_whitespace,
4806 					    s->force_text_diff, &dsa, s->f);
4807 					if (err)
4808 						goto done;
4809 					break;
4810 				}
4811 			}
4812 		}
4813 		got_object_commit_close(commit2);
4814 
4815 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4816 		    lines, nlines);
4817 		break;
4818 	}
4819 	default:
4820 		err = got_error(GOT_ERR_OBJ_TYPE);
4821 		break;
4822 	}
4823 done:
4824 	free(lines);
4825 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4826 	if (s->f && fflush(s->f) != 0 && err == NULL)
4827 		err = got_error_from_errno("fflush");
4828 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4829 		err = got_error_from_errno("fclose");
4830 	return err;
4831 }
4832 
4833 static void
4834 diff_view_indicate_progress(struct tog_view *view)
4835 {
4836 	mvwaddstr(view->window, 0, 0, "diffing...");
4837 	update_panels();
4838 	doupdate();
4839 }
4840 
4841 static const struct got_error *
4842 search_start_diff_view(struct tog_view *view)
4843 {
4844 	struct tog_diff_view_state *s = &view->state.diff;
4845 
4846 	s->matched_line = 0;
4847 	return NULL;
4848 }
4849 
4850 static void
4851 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4852     size_t *nlines, int **first, int **last, int **match, int **selected)
4853 {
4854 	struct tog_diff_view_state *s = &view->state.diff;
4855 
4856 	*f = s->f;
4857 	*nlines = s->nlines;
4858 	*line_offsets = NULL;
4859 	*match = &s->matched_line;
4860 	*first = &s->first_displayed_line;
4861 	*last = &s->last_displayed_line;
4862 	*selected = &s->selected_line;
4863 }
4864 
4865 static const struct got_error *
4866 search_next_view_match(struct tog_view *view)
4867 {
4868 	const struct got_error *err = NULL;
4869 	FILE *f;
4870 	int lineno;
4871 	char *line = NULL;
4872 	size_t linesize = 0;
4873 	ssize_t linelen;
4874 	off_t *line_offsets;
4875 	size_t nlines = 0;
4876 	int *first, *last, *match, *selected;
4877 
4878 	if (!view->search_setup)
4879 		return got_error_msg(GOT_ERR_NOT_IMPL,
4880 		    "view search not supported");
4881 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4882 	    &match, &selected);
4883 
4884 	if (!view->searching) {
4885 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4886 		return NULL;
4887 	}
4888 
4889 	if (*match) {
4890 		if (view->searching == TOG_SEARCH_FORWARD)
4891 			lineno = *match + 1;
4892 		else
4893 			lineno = *match - 1;
4894 	} else
4895 		lineno = *first - 1 + *selected;
4896 
4897 	while (1) {
4898 		off_t offset;
4899 
4900 		if (lineno <= 0 || lineno > nlines) {
4901 			if (*match == 0) {
4902 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4903 				break;
4904 			}
4905 
4906 			if (view->searching == TOG_SEARCH_FORWARD)
4907 				lineno = 1;
4908 			else
4909 				lineno = nlines;
4910 		}
4911 
4912 		offset = view->type == TOG_VIEW_DIFF ?
4913 		    view->state.diff.lines[lineno - 1].offset :
4914 		    line_offsets[lineno - 1];
4915 		if (fseeko(f, offset, SEEK_SET) != 0) {
4916 			free(line);
4917 			return got_error_from_errno("fseeko");
4918 		}
4919 		linelen = getline(&line, &linesize, f);
4920 		if (linelen != -1) {
4921 			char *exstr;
4922 			err = expand_tab(&exstr, line);
4923 			if (err)
4924 				break;
4925 			if (match_line(exstr, &view->regex, 1,
4926 			    &view->regmatch)) {
4927 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4928 				*match = lineno;
4929 				free(exstr);
4930 				break;
4931 			}
4932 			free(exstr);
4933 		}
4934 		if (view->searching == TOG_SEARCH_FORWARD)
4935 			lineno++;
4936 		else
4937 			lineno--;
4938 	}
4939 	free(line);
4940 
4941 	if (*match) {
4942 		*first = *match;
4943 		*selected = 1;
4944 	}
4945 
4946 	return err;
4947 }
4948 
4949 static const struct got_error *
4950 close_diff_view(struct tog_view *view)
4951 {
4952 	const struct got_error *err = NULL;
4953 	struct tog_diff_view_state *s = &view->state.diff;
4954 
4955 	free(s->id1);
4956 	s->id1 = NULL;
4957 	free(s->id2);
4958 	s->id2 = NULL;
4959 	if (s->f && fclose(s->f) == EOF)
4960 		err = got_error_from_errno("fclose");
4961 	s->f = NULL;
4962 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4963 		err = got_error_from_errno("fclose");
4964 	s->f1 = NULL;
4965 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4966 		err = got_error_from_errno("fclose");
4967 	s->f2 = NULL;
4968 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4969 		err = got_error_from_errno("close");
4970 	s->fd1 = -1;
4971 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4972 		err = got_error_from_errno("close");
4973 	s->fd2 = -1;
4974 	free(s->lines);
4975 	s->lines = NULL;
4976 	s->nlines = 0;
4977 	return err;
4978 }
4979 
4980 static const struct got_error *
4981 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4982     struct got_object_id *id2, const char *label1, const char *label2,
4983     int diff_context, int ignore_whitespace, int force_text_diff,
4984     struct tog_view *parent_view, struct got_repository *repo)
4985 {
4986 	const struct got_error *err;
4987 	struct tog_diff_view_state *s = &view->state.diff;
4988 
4989 	memset(s, 0, sizeof(*s));
4990 	s->fd1 = -1;
4991 	s->fd2 = -1;
4992 
4993 	if (id1 != NULL && id2 != NULL) {
4994 	    int type1, type2;
4995 	    err = got_object_get_type(&type1, repo, id1);
4996 	    if (err)
4997 		return err;
4998 	    err = got_object_get_type(&type2, repo, id2);
4999 	    if (err)
5000 		return err;
5001 
5002 	    if (type1 != type2)
5003 		return got_error(GOT_ERR_OBJ_TYPE);
5004 	}
5005 	s->first_displayed_line = 1;
5006 	s->last_displayed_line = view->nlines;
5007 	s->selected_line = 1;
5008 	s->repo = repo;
5009 	s->id1 = id1;
5010 	s->id2 = id2;
5011 	s->label1 = label1;
5012 	s->label2 = label2;
5013 
5014 	if (id1) {
5015 		s->id1 = got_object_id_dup(id1);
5016 		if (s->id1 == NULL)
5017 			return got_error_from_errno("got_object_id_dup");
5018 	} else
5019 		s->id1 = NULL;
5020 
5021 	s->id2 = got_object_id_dup(id2);
5022 	if (s->id2 == NULL) {
5023 		err = got_error_from_errno("got_object_id_dup");
5024 		goto done;
5025 	}
5026 
5027 	s->f1 = got_opentemp();
5028 	if (s->f1 == NULL) {
5029 		err = got_error_from_errno("got_opentemp");
5030 		goto done;
5031 	}
5032 
5033 	s->f2 = got_opentemp();
5034 	if (s->f2 == NULL) {
5035 		err = got_error_from_errno("got_opentemp");
5036 		goto done;
5037 	}
5038 
5039 	s->fd1 = got_opentempfd();
5040 	if (s->fd1 == -1) {
5041 		err = got_error_from_errno("got_opentempfd");
5042 		goto done;
5043 	}
5044 
5045 	s->fd2 = got_opentempfd();
5046 	if (s->fd2 == -1) {
5047 		err = got_error_from_errno("got_opentempfd");
5048 		goto done;
5049 	}
5050 
5051 	s->diff_context = diff_context;
5052 	s->ignore_whitespace = ignore_whitespace;
5053 	s->force_text_diff = force_text_diff;
5054 	s->parent_view = parent_view;
5055 	s->repo = repo;
5056 
5057 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5058 		int rc;
5059 
5060 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5061 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5062 		if (rc != ERR)
5063 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5064 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5065 		if (rc != ERR)
5066 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5067 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5068 		if (rc != ERR)
5069 			rc = init_pair(GOT_DIFF_LINE_META,
5070 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5071 		if (rc != ERR)
5072 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5073 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5074 		if (rc != ERR)
5075 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5076 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5077 		if (rc != ERR)
5078 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5079 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5080 		if (rc != ERR)
5081 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5082 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5083 		if (rc != ERR)
5084 			rc = init_pair(GOT_DIFF_LINE_DATE,
5085 			    get_color_value("TOG_COLOR_DATE"), -1);
5086 		if (rc == ERR) {
5087 			err = got_error(GOT_ERR_RANGE);
5088 			goto done;
5089 		}
5090 	}
5091 
5092 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5093 	    view_is_splitscreen(view))
5094 		show_log_view(parent_view); /* draw border */
5095 	diff_view_indicate_progress(view);
5096 
5097 	err = create_diff(s);
5098 
5099 	view->show = show_diff_view;
5100 	view->input = input_diff_view;
5101 	view->reset = reset_diff_view;
5102 	view->close = close_diff_view;
5103 	view->search_start = search_start_diff_view;
5104 	view->search_setup = search_setup_diff_view;
5105 	view->search_next = search_next_view_match;
5106 done:
5107 	if (err)
5108 		close_diff_view(view);
5109 	return err;
5110 }
5111 
5112 static const struct got_error *
5113 show_diff_view(struct tog_view *view)
5114 {
5115 	const struct got_error *err;
5116 	struct tog_diff_view_state *s = &view->state.diff;
5117 	char *id_str1 = NULL, *id_str2, *header;
5118 	const char *label1, *label2;
5119 
5120 	if (s->id1) {
5121 		err = got_object_id_str(&id_str1, s->id1);
5122 		if (err)
5123 			return err;
5124 		label1 = s->label1 ? s->label1 : id_str1;
5125 	} else
5126 		label1 = "/dev/null";
5127 
5128 	err = got_object_id_str(&id_str2, s->id2);
5129 	if (err)
5130 		return err;
5131 	label2 = s->label2 ? s->label2 : id_str2;
5132 
5133 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5134 		err = got_error_from_errno("asprintf");
5135 		free(id_str1);
5136 		free(id_str2);
5137 		return err;
5138 	}
5139 	free(id_str1);
5140 	free(id_str2);
5141 
5142 	err = draw_file(view, header);
5143 	free(header);
5144 	return err;
5145 }
5146 
5147 static const struct got_error *
5148 set_selected_commit(struct tog_diff_view_state *s,
5149     struct commit_queue_entry *entry)
5150 {
5151 	const struct got_error *err;
5152 	const struct got_object_id_queue *parent_ids;
5153 	struct got_commit_object *selected_commit;
5154 	struct got_object_qid *pid;
5155 
5156 	free(s->id2);
5157 	s->id2 = got_object_id_dup(entry->id);
5158 	if (s->id2 == NULL)
5159 		return got_error_from_errno("got_object_id_dup");
5160 
5161 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5162 	if (err)
5163 		return err;
5164 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5165 	free(s->id1);
5166 	pid = STAILQ_FIRST(parent_ids);
5167 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5168 	got_object_commit_close(selected_commit);
5169 	return NULL;
5170 }
5171 
5172 static const struct got_error *
5173 reset_diff_view(struct tog_view *view)
5174 {
5175 	struct tog_diff_view_state *s = &view->state.diff;
5176 
5177 	view->count = 0;
5178 	wclear(view->window);
5179 	s->first_displayed_line = 1;
5180 	s->last_displayed_line = view->nlines;
5181 	s->matched_line = 0;
5182 	diff_view_indicate_progress(view);
5183 	return create_diff(s);
5184 }
5185 
5186 static void
5187 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5188 {
5189 	int start, i;
5190 
5191 	i = start = s->first_displayed_line - 1;
5192 
5193 	while (s->lines[i].type != type) {
5194 		if (i == 0)
5195 			i = s->nlines - 1;
5196 		if (--i == start)
5197 			return; /* do nothing, requested type not in file */
5198 	}
5199 
5200 	s->selected_line = 1;
5201 	s->first_displayed_line = i;
5202 }
5203 
5204 static void
5205 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5206 {
5207 	int start, i;
5208 
5209 	i = start = s->first_displayed_line + 1;
5210 
5211 	while (s->lines[i].type != type) {
5212 		if (i == s->nlines - 1)
5213 			i = 0;
5214 		if (++i == start)
5215 			return; /* do nothing, requested type not in file */
5216 	}
5217 
5218 	s->selected_line = 1;
5219 	s->first_displayed_line = i;
5220 }
5221 
5222 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5223     int, int, int);
5224 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5225     int, int);
5226 
5227 static const struct got_error *
5228 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5229 {
5230 	const struct got_error *err = NULL;
5231 	struct tog_diff_view_state *s = &view->state.diff;
5232 	struct tog_log_view_state *ls;
5233 	struct commit_queue_entry *old_selected_entry;
5234 	char *line = NULL;
5235 	size_t linesize = 0;
5236 	ssize_t linelen;
5237 	int i, nscroll = view->nlines - 1, up = 0;
5238 
5239 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5240 
5241 	switch (ch) {
5242 	case '0':
5243 		view->x = 0;
5244 		break;
5245 	case '$':
5246 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5247 		view->count = 0;
5248 		break;
5249 	case KEY_RIGHT:
5250 	case 'l':
5251 		if (view->x + view->ncols / 3 < view->maxx)
5252 			view->x += 2;  /* move two columns right */
5253 		else
5254 			view->count = 0;
5255 		break;
5256 	case KEY_LEFT:
5257 	case 'h':
5258 		view->x -= MIN(view->x, 2);  /* move two columns back */
5259 		if (view->x <= 0)
5260 			view->count = 0;
5261 		break;
5262 	case 'a':
5263 	case 'w':
5264 		if (ch == 'a')
5265 			s->force_text_diff = !s->force_text_diff;
5266 		else if (ch == 'w')
5267 			s->ignore_whitespace = !s->ignore_whitespace;
5268 		err = reset_diff_view(view);
5269 		break;
5270 	case 'g':
5271 	case KEY_HOME:
5272 		s->first_displayed_line = 1;
5273 		view->count = 0;
5274 		break;
5275 	case 'G':
5276 	case KEY_END:
5277 		view->count = 0;
5278 		if (s->eof)
5279 			break;
5280 
5281 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5282 		s->eof = 1;
5283 		break;
5284 	case 'k':
5285 	case KEY_UP:
5286 	case CTRL('p'):
5287 		if (s->first_displayed_line > 1)
5288 			s->first_displayed_line--;
5289 		else
5290 			view->count = 0;
5291 		break;
5292 	case CTRL('u'):
5293 	case 'u':
5294 		nscroll /= 2;
5295 		/* FALL THROUGH */
5296 	case KEY_PPAGE:
5297 	case CTRL('b'):
5298 	case 'b':
5299 		if (s->first_displayed_line == 1) {
5300 			view->count = 0;
5301 			break;
5302 		}
5303 		i = 0;
5304 		while (i++ < nscroll && s->first_displayed_line > 1)
5305 			s->first_displayed_line--;
5306 		break;
5307 	case 'j':
5308 	case KEY_DOWN:
5309 	case CTRL('n'):
5310 		if (!s->eof)
5311 			s->first_displayed_line++;
5312 		else
5313 			view->count = 0;
5314 		break;
5315 	case CTRL('d'):
5316 	case 'd':
5317 		nscroll /= 2;
5318 		/* FALL THROUGH */
5319 	case KEY_NPAGE:
5320 	case CTRL('f'):
5321 	case 'f':
5322 	case ' ':
5323 		if (s->eof) {
5324 			view->count = 0;
5325 			break;
5326 		}
5327 		i = 0;
5328 		while (!s->eof && i++ < nscroll) {
5329 			linelen = getline(&line, &linesize, s->f);
5330 			s->first_displayed_line++;
5331 			if (linelen == -1) {
5332 				if (feof(s->f)) {
5333 					s->eof = 1;
5334 				} else
5335 					err = got_ferror(s->f, GOT_ERR_IO);
5336 				break;
5337 			}
5338 		}
5339 		free(line);
5340 		break;
5341 	case '(':
5342 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5343 		break;
5344 	case ')':
5345 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5346 		break;
5347 	case '{':
5348 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5349 		break;
5350 	case '}':
5351 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5352 		break;
5353 	case '[':
5354 		if (s->diff_context > 0) {
5355 			s->diff_context--;
5356 			s->matched_line = 0;
5357 			diff_view_indicate_progress(view);
5358 			err = create_diff(s);
5359 			if (s->first_displayed_line + view->nlines - 1 >
5360 			    s->nlines) {
5361 				s->first_displayed_line = 1;
5362 				s->last_displayed_line = view->nlines;
5363 			}
5364 		} else
5365 			view->count = 0;
5366 		break;
5367 	case ']':
5368 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5369 			s->diff_context++;
5370 			s->matched_line = 0;
5371 			diff_view_indicate_progress(view);
5372 			err = create_diff(s);
5373 		} else
5374 			view->count = 0;
5375 		break;
5376 	case '<':
5377 	case ',':
5378 	case 'K':
5379 		up = 1;
5380 		/* FALL THROUGH */
5381 	case '>':
5382 	case '.':
5383 	case 'J':
5384 		if (s->parent_view == NULL) {
5385 			view->count = 0;
5386 			break;
5387 		}
5388 		s->parent_view->count = view->count;
5389 
5390 		if (s->parent_view->type == TOG_VIEW_LOG) {
5391 			ls = &s->parent_view->state.log;
5392 			old_selected_entry = ls->selected_entry;
5393 
5394 			err = input_log_view(NULL, s->parent_view,
5395 			    up ? KEY_UP : KEY_DOWN);
5396 			if (err)
5397 				break;
5398 			view->count = s->parent_view->count;
5399 
5400 			if (old_selected_entry == ls->selected_entry)
5401 				break;
5402 
5403 			err = set_selected_commit(s, ls->selected_entry);
5404 			if (err)
5405 				break;
5406 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5407 			struct tog_blame_view_state *bs;
5408 			struct got_object_id *id, *prev_id;
5409 
5410 			bs = &s->parent_view->state.blame;
5411 			prev_id = get_annotation_for_line(bs->blame.lines,
5412 			    bs->blame.nlines, bs->last_diffed_line);
5413 
5414 			err = input_blame_view(&view, s->parent_view,
5415 			    up ? KEY_UP : KEY_DOWN);
5416 			if (err)
5417 				break;
5418 			view->count = s->parent_view->count;
5419 
5420 			if (prev_id == NULL)
5421 				break;
5422 			id = get_selected_commit_id(bs->blame.lines,
5423 			    bs->blame.nlines, bs->first_displayed_line,
5424 			    bs->selected_line);
5425 			if (id == NULL)
5426 				break;
5427 
5428 			if (!got_object_id_cmp(prev_id, id))
5429 				break;
5430 
5431 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5432 			if (err)
5433 				break;
5434 		}
5435 		s->first_displayed_line = 1;
5436 		s->last_displayed_line = view->nlines;
5437 		s->matched_line = 0;
5438 		view->x = 0;
5439 
5440 		diff_view_indicate_progress(view);
5441 		err = create_diff(s);
5442 		break;
5443 	default:
5444 		view->count = 0;
5445 		break;
5446 	}
5447 
5448 	return err;
5449 }
5450 
5451 static const struct got_error *
5452 cmd_diff(int argc, char *argv[])
5453 {
5454 	const struct got_error *error = NULL;
5455 	struct got_repository *repo = NULL;
5456 	struct got_worktree *worktree = NULL;
5457 	struct got_object_id *id1 = NULL, *id2 = NULL;
5458 	char *repo_path = NULL, *cwd = NULL;
5459 	char *id_str1 = NULL, *id_str2 = NULL;
5460 	char *label1 = NULL, *label2 = NULL;
5461 	int diff_context = 3, ignore_whitespace = 0;
5462 	int ch, force_text_diff = 0;
5463 	const char *errstr;
5464 	struct tog_view *view;
5465 	int *pack_fds = NULL;
5466 
5467 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5468 		switch (ch) {
5469 		case 'a':
5470 			force_text_diff = 1;
5471 			break;
5472 		case 'C':
5473 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5474 			    &errstr);
5475 			if (errstr != NULL)
5476 				errx(1, "number of context lines is %s: %s",
5477 				    errstr, errstr);
5478 			break;
5479 		case 'r':
5480 			repo_path = realpath(optarg, NULL);
5481 			if (repo_path == NULL)
5482 				return got_error_from_errno2("realpath",
5483 				    optarg);
5484 			got_path_strip_trailing_slashes(repo_path);
5485 			break;
5486 		case 'w':
5487 			ignore_whitespace = 1;
5488 			break;
5489 		default:
5490 			usage_diff();
5491 			/* NOTREACHED */
5492 		}
5493 	}
5494 
5495 	argc -= optind;
5496 	argv += optind;
5497 
5498 	if (argc == 0) {
5499 		usage_diff(); /* TODO show local worktree changes */
5500 	} else if (argc == 2) {
5501 		id_str1 = argv[0];
5502 		id_str2 = argv[1];
5503 	} else
5504 		usage_diff();
5505 
5506 	error = got_repo_pack_fds_open(&pack_fds);
5507 	if (error)
5508 		goto done;
5509 
5510 	if (repo_path == NULL) {
5511 		cwd = getcwd(NULL, 0);
5512 		if (cwd == NULL)
5513 			return got_error_from_errno("getcwd");
5514 		error = got_worktree_open(&worktree, cwd);
5515 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5516 			goto done;
5517 		if (worktree)
5518 			repo_path =
5519 			    strdup(got_worktree_get_repo_path(worktree));
5520 		else
5521 			repo_path = strdup(cwd);
5522 		if (repo_path == NULL) {
5523 			error = got_error_from_errno("strdup");
5524 			goto done;
5525 		}
5526 	}
5527 
5528 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5529 	if (error)
5530 		goto done;
5531 
5532 	init_curses();
5533 
5534 	error = apply_unveil(got_repo_get_path(repo), NULL);
5535 	if (error)
5536 		goto done;
5537 
5538 	error = tog_load_refs(repo, 0);
5539 	if (error)
5540 		goto done;
5541 
5542 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5543 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5544 	if (error)
5545 		goto done;
5546 
5547 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5548 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5549 	if (error)
5550 		goto done;
5551 
5552 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5553 	if (view == NULL) {
5554 		error = got_error_from_errno("view_open");
5555 		goto done;
5556 	}
5557 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5558 	    ignore_whitespace, force_text_diff, NULL,  repo);
5559 	if (error)
5560 		goto done;
5561 	error = view_loop(view);
5562 done:
5563 	free(label1);
5564 	free(label2);
5565 	free(repo_path);
5566 	free(cwd);
5567 	if (repo) {
5568 		const struct got_error *close_err = got_repo_close(repo);
5569 		if (error == NULL)
5570 			error = close_err;
5571 	}
5572 	if (worktree)
5573 		got_worktree_close(worktree);
5574 	if (pack_fds) {
5575 		const struct got_error *pack_err =
5576 		    got_repo_pack_fds_close(pack_fds);
5577 		if (error == NULL)
5578 			error = pack_err;
5579 	}
5580 	tog_free_refs();
5581 	return error;
5582 }
5583 
5584 __dead static void
5585 usage_blame(void)
5586 {
5587 	endwin();
5588 	fprintf(stderr,
5589 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5590 	    getprogname());
5591 	exit(1);
5592 }
5593 
5594 struct tog_blame_line {
5595 	int annotated;
5596 	struct got_object_id *id;
5597 };
5598 
5599 static const struct got_error *
5600 draw_blame(struct tog_view *view)
5601 {
5602 	struct tog_blame_view_state *s = &view->state.blame;
5603 	struct tog_blame *blame = &s->blame;
5604 	regmatch_t *regmatch = &view->regmatch;
5605 	const struct got_error *err;
5606 	int lineno = 0, nprinted = 0;
5607 	char *line = NULL;
5608 	size_t linesize = 0;
5609 	ssize_t linelen;
5610 	wchar_t *wline;
5611 	int width;
5612 	struct tog_blame_line *blame_line;
5613 	struct got_object_id *prev_id = NULL;
5614 	char *id_str;
5615 	struct tog_color *tc;
5616 
5617 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5618 	if (err)
5619 		return err;
5620 
5621 	rewind(blame->f);
5622 	werase(view->window);
5623 
5624 	if (asprintf(&line, "commit %s", id_str) == -1) {
5625 		err = got_error_from_errno("asprintf");
5626 		free(id_str);
5627 		return err;
5628 	}
5629 
5630 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5631 	free(line);
5632 	line = NULL;
5633 	if (err)
5634 		return err;
5635 	if (view_needs_focus_indication(view))
5636 		wstandout(view->window);
5637 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5638 	if (tc)
5639 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5640 	waddwstr(view->window, wline);
5641 	while (width++ < view->ncols)
5642 		waddch(view->window, ' ');
5643 	if (tc)
5644 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5645 	if (view_needs_focus_indication(view))
5646 		wstandend(view->window);
5647 	free(wline);
5648 	wline = NULL;
5649 
5650 	if (view->gline > blame->nlines)
5651 		view->gline = blame->nlines;
5652 
5653 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5654 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5655 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5656 		free(id_str);
5657 		return got_error_from_errno("asprintf");
5658 	}
5659 	free(id_str);
5660 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5661 	free(line);
5662 	line = NULL;
5663 	if (err)
5664 		return err;
5665 	waddwstr(view->window, wline);
5666 	free(wline);
5667 	wline = NULL;
5668 	if (width < view->ncols - 1)
5669 		waddch(view->window, '\n');
5670 
5671 	s->eof = 0;
5672 	view->maxx = 0;
5673 	while (nprinted < view->nlines - 2) {
5674 		linelen = getline(&line, &linesize, blame->f);
5675 		if (linelen == -1) {
5676 			if (feof(blame->f)) {
5677 				s->eof = 1;
5678 				break;
5679 			}
5680 			free(line);
5681 			return got_ferror(blame->f, GOT_ERR_IO);
5682 		}
5683 		if (++lineno < s->first_displayed_line)
5684 			continue;
5685 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5686 			continue;
5687 
5688 		/* Set view->maxx based on full line length. */
5689 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5690 		if (err) {
5691 			free(line);
5692 			return err;
5693 		}
5694 		free(wline);
5695 		wline = NULL;
5696 		view->maxx = MAX(view->maxx, width);
5697 
5698 		if (nprinted == s->selected_line - 1)
5699 			wstandout(view->window);
5700 
5701 		if (blame->nlines > 0) {
5702 			blame_line = &blame->lines[lineno - 1];
5703 			if (blame_line->annotated && prev_id &&
5704 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5705 			    !(nprinted == s->selected_line - 1)) {
5706 				waddstr(view->window, "        ");
5707 			} else if (blame_line->annotated) {
5708 				char *id_str;
5709 				err = got_object_id_str(&id_str,
5710 				    blame_line->id);
5711 				if (err) {
5712 					free(line);
5713 					return err;
5714 				}
5715 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5716 				if (tc)
5717 					wattr_on(view->window,
5718 					    COLOR_PAIR(tc->colorpair), NULL);
5719 				wprintw(view->window, "%.8s", id_str);
5720 				if (tc)
5721 					wattr_off(view->window,
5722 					    COLOR_PAIR(tc->colorpair), NULL);
5723 				free(id_str);
5724 				prev_id = blame_line->id;
5725 			} else {
5726 				waddstr(view->window, "........");
5727 				prev_id = NULL;
5728 			}
5729 		} else {
5730 			waddstr(view->window, "........");
5731 			prev_id = NULL;
5732 		}
5733 
5734 		if (nprinted == s->selected_line - 1)
5735 			wstandend(view->window);
5736 		waddstr(view->window, " ");
5737 
5738 		if (view->ncols <= 9) {
5739 			width = 9;
5740 		} else if (s->first_displayed_line + nprinted ==
5741 		    s->matched_line &&
5742 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5743 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5744 			    view->window, view->x, regmatch);
5745 			if (err) {
5746 				free(line);
5747 				return err;
5748 			}
5749 			width += 9;
5750 		} else {
5751 			int skip;
5752 			err = format_line(&wline, &width, &skip, line,
5753 			    view->x, view->ncols - 9, 9, 1);
5754 			if (err) {
5755 				free(line);
5756 				return err;
5757 			}
5758 			waddwstr(view->window, &wline[skip]);
5759 			width += 9;
5760 			free(wline);
5761 			wline = NULL;
5762 		}
5763 
5764 		if (width <= view->ncols - 1)
5765 			waddch(view->window, '\n');
5766 		if (++nprinted == 1)
5767 			s->first_displayed_line = lineno;
5768 	}
5769 	free(line);
5770 	s->last_displayed_line = lineno;
5771 
5772 	view_border(view);
5773 
5774 	return NULL;
5775 }
5776 
5777 static const struct got_error *
5778 blame_cb(void *arg, int nlines, int lineno,
5779     struct got_commit_object *commit, struct got_object_id *id)
5780 {
5781 	const struct got_error *err = NULL;
5782 	struct tog_blame_cb_args *a = arg;
5783 	struct tog_blame_line *line;
5784 	int errcode;
5785 
5786 	if (nlines != a->nlines ||
5787 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5788 		return got_error(GOT_ERR_RANGE);
5789 
5790 	errcode = pthread_mutex_lock(&tog_mutex);
5791 	if (errcode)
5792 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5793 
5794 	if (*a->quit) {	/* user has quit the blame view */
5795 		err = got_error(GOT_ERR_ITER_COMPLETED);
5796 		goto done;
5797 	}
5798 
5799 	if (lineno == -1)
5800 		goto done; /* no change in this commit */
5801 
5802 	line = &a->lines[lineno - 1];
5803 	if (line->annotated)
5804 		goto done;
5805 
5806 	line->id = got_object_id_dup(id);
5807 	if (line->id == NULL) {
5808 		err = got_error_from_errno("got_object_id_dup");
5809 		goto done;
5810 	}
5811 	line->annotated = 1;
5812 done:
5813 	errcode = pthread_mutex_unlock(&tog_mutex);
5814 	if (errcode)
5815 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5816 	return err;
5817 }
5818 
5819 static void *
5820 blame_thread(void *arg)
5821 {
5822 	const struct got_error *err, *close_err;
5823 	struct tog_blame_thread_args *ta = arg;
5824 	struct tog_blame_cb_args *a = ta->cb_args;
5825 	int errcode, fd1 = -1, fd2 = -1;
5826 	FILE *f1 = NULL, *f2 = NULL;
5827 
5828 	fd1 = got_opentempfd();
5829 	if (fd1 == -1)
5830 		return (void *)got_error_from_errno("got_opentempfd");
5831 
5832 	fd2 = got_opentempfd();
5833 	if (fd2 == -1) {
5834 		err = got_error_from_errno("got_opentempfd");
5835 		goto done;
5836 	}
5837 
5838 	f1 = got_opentemp();
5839 	if (f1 == NULL) {
5840 		err = (void *)got_error_from_errno("got_opentemp");
5841 		goto done;
5842 	}
5843 	f2 = got_opentemp();
5844 	if (f2 == NULL) {
5845 		err = (void *)got_error_from_errno("got_opentemp");
5846 		goto done;
5847 	}
5848 
5849 	err = block_signals_used_by_main_thread();
5850 	if (err)
5851 		goto done;
5852 
5853 	err = got_blame(ta->path, a->commit_id, ta->repo,
5854 	    tog_diff_algo, blame_cb, ta->cb_args,
5855 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5856 	if (err && err->code == GOT_ERR_CANCELLED)
5857 		err = NULL;
5858 
5859 	errcode = pthread_mutex_lock(&tog_mutex);
5860 	if (errcode) {
5861 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5862 		goto done;
5863 	}
5864 
5865 	close_err = got_repo_close(ta->repo);
5866 	if (err == NULL)
5867 		err = close_err;
5868 	ta->repo = NULL;
5869 	*ta->complete = 1;
5870 
5871 	errcode = pthread_mutex_unlock(&tog_mutex);
5872 	if (errcode && err == NULL)
5873 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5874 
5875 done:
5876 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5877 		err = got_error_from_errno("close");
5878 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5879 		err = got_error_from_errno("close");
5880 	if (f1 && fclose(f1) == EOF && err == NULL)
5881 		err = got_error_from_errno("fclose");
5882 	if (f2 && fclose(f2) == EOF && err == NULL)
5883 		err = got_error_from_errno("fclose");
5884 
5885 	return (void *)err;
5886 }
5887 
5888 static struct got_object_id *
5889 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5890     int first_displayed_line, int selected_line)
5891 {
5892 	struct tog_blame_line *line;
5893 
5894 	if (nlines <= 0)
5895 		return NULL;
5896 
5897 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5898 	if (!line->annotated)
5899 		return NULL;
5900 
5901 	return line->id;
5902 }
5903 
5904 static struct got_object_id *
5905 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5906     int lineno)
5907 {
5908 	struct tog_blame_line *line;
5909 
5910 	if (nlines <= 0 || lineno >= nlines)
5911 		return NULL;
5912 
5913 	line = &lines[lineno - 1];
5914 	if (!line->annotated)
5915 		return NULL;
5916 
5917 	return line->id;
5918 }
5919 
5920 static const struct got_error *
5921 stop_blame(struct tog_blame *blame)
5922 {
5923 	const struct got_error *err = NULL;
5924 	int i;
5925 
5926 	if (blame->thread) {
5927 		int errcode;
5928 		errcode = pthread_mutex_unlock(&tog_mutex);
5929 		if (errcode)
5930 			return got_error_set_errno(errcode,
5931 			    "pthread_mutex_unlock");
5932 		errcode = pthread_join(blame->thread, (void **)&err);
5933 		if (errcode)
5934 			return got_error_set_errno(errcode, "pthread_join");
5935 		errcode = pthread_mutex_lock(&tog_mutex);
5936 		if (errcode)
5937 			return got_error_set_errno(errcode,
5938 			    "pthread_mutex_lock");
5939 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5940 			err = NULL;
5941 		blame->thread = NULL;
5942 	}
5943 	if (blame->thread_args.repo) {
5944 		const struct got_error *close_err;
5945 		close_err = got_repo_close(blame->thread_args.repo);
5946 		if (err == NULL)
5947 			err = close_err;
5948 		blame->thread_args.repo = NULL;
5949 	}
5950 	if (blame->f) {
5951 		if (fclose(blame->f) == EOF && err == NULL)
5952 			err = got_error_from_errno("fclose");
5953 		blame->f = NULL;
5954 	}
5955 	if (blame->lines) {
5956 		for (i = 0; i < blame->nlines; i++)
5957 			free(blame->lines[i].id);
5958 		free(blame->lines);
5959 		blame->lines = NULL;
5960 	}
5961 	free(blame->cb_args.commit_id);
5962 	blame->cb_args.commit_id = NULL;
5963 	if (blame->pack_fds) {
5964 		const struct got_error *pack_err =
5965 		    got_repo_pack_fds_close(blame->pack_fds);
5966 		if (err == NULL)
5967 			err = pack_err;
5968 		blame->pack_fds = NULL;
5969 	}
5970 	return err;
5971 }
5972 
5973 static const struct got_error *
5974 cancel_blame_view(void *arg)
5975 {
5976 	const struct got_error *err = NULL;
5977 	int *done = arg;
5978 	int errcode;
5979 
5980 	errcode = pthread_mutex_lock(&tog_mutex);
5981 	if (errcode)
5982 		return got_error_set_errno(errcode,
5983 		    "pthread_mutex_unlock");
5984 
5985 	if (*done)
5986 		err = got_error(GOT_ERR_CANCELLED);
5987 
5988 	errcode = pthread_mutex_unlock(&tog_mutex);
5989 	if (errcode)
5990 		return got_error_set_errno(errcode,
5991 		    "pthread_mutex_lock");
5992 
5993 	return err;
5994 }
5995 
5996 static const struct got_error *
5997 run_blame(struct tog_view *view)
5998 {
5999 	struct tog_blame_view_state *s = &view->state.blame;
6000 	struct tog_blame *blame = &s->blame;
6001 	const struct got_error *err = NULL;
6002 	struct got_commit_object *commit = NULL;
6003 	struct got_blob_object *blob = NULL;
6004 	struct got_repository *thread_repo = NULL;
6005 	struct got_object_id *obj_id = NULL;
6006 	int obj_type, fd = -1;
6007 	int *pack_fds = NULL;
6008 
6009 	err = got_object_open_as_commit(&commit, s->repo,
6010 	    &s->blamed_commit->id);
6011 	if (err)
6012 		return err;
6013 
6014 	fd = got_opentempfd();
6015 	if (fd == -1) {
6016 		err = got_error_from_errno("got_opentempfd");
6017 		goto done;
6018 	}
6019 
6020 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6021 	if (err)
6022 		goto done;
6023 
6024 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6025 	if (err)
6026 		goto done;
6027 
6028 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6029 		err = got_error(GOT_ERR_OBJ_TYPE);
6030 		goto done;
6031 	}
6032 
6033 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6034 	if (err)
6035 		goto done;
6036 	blame->f = got_opentemp();
6037 	if (blame->f == NULL) {
6038 		err = got_error_from_errno("got_opentemp");
6039 		goto done;
6040 	}
6041 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6042 	    &blame->line_offsets, blame->f, blob);
6043 	if (err)
6044 		goto done;
6045 	if (blame->nlines == 0) {
6046 		s->blame_complete = 1;
6047 		goto done;
6048 	}
6049 
6050 	/* Don't include \n at EOF in the blame line count. */
6051 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6052 		blame->nlines--;
6053 
6054 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6055 	if (blame->lines == NULL) {
6056 		err = got_error_from_errno("calloc");
6057 		goto done;
6058 	}
6059 
6060 	err = got_repo_pack_fds_open(&pack_fds);
6061 	if (err)
6062 		goto done;
6063 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6064 	    pack_fds);
6065 	if (err)
6066 		goto done;
6067 
6068 	blame->pack_fds = pack_fds;
6069 	blame->cb_args.view = view;
6070 	blame->cb_args.lines = blame->lines;
6071 	blame->cb_args.nlines = blame->nlines;
6072 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6073 	if (blame->cb_args.commit_id == NULL) {
6074 		err = got_error_from_errno("got_object_id_dup");
6075 		goto done;
6076 	}
6077 	blame->cb_args.quit = &s->done;
6078 
6079 	blame->thread_args.path = s->path;
6080 	blame->thread_args.repo = thread_repo;
6081 	blame->thread_args.cb_args = &blame->cb_args;
6082 	blame->thread_args.complete = &s->blame_complete;
6083 	blame->thread_args.cancel_cb = cancel_blame_view;
6084 	blame->thread_args.cancel_arg = &s->done;
6085 	s->blame_complete = 0;
6086 
6087 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6088 		s->first_displayed_line = 1;
6089 		s->last_displayed_line = view->nlines;
6090 		s->selected_line = 1;
6091 	}
6092 	s->matched_line = 0;
6093 
6094 done:
6095 	if (commit)
6096 		got_object_commit_close(commit);
6097 	if (fd != -1 && close(fd) == -1 && err == NULL)
6098 		err = got_error_from_errno("close");
6099 	if (blob)
6100 		got_object_blob_close(blob);
6101 	free(obj_id);
6102 	if (err)
6103 		stop_blame(blame);
6104 	return err;
6105 }
6106 
6107 static const struct got_error *
6108 open_blame_view(struct tog_view *view, char *path,
6109     struct got_object_id *commit_id, struct got_repository *repo)
6110 {
6111 	const struct got_error *err = NULL;
6112 	struct tog_blame_view_state *s = &view->state.blame;
6113 
6114 	STAILQ_INIT(&s->blamed_commits);
6115 
6116 	s->path = strdup(path);
6117 	if (s->path == NULL)
6118 		return got_error_from_errno("strdup");
6119 
6120 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6121 	if (err) {
6122 		free(s->path);
6123 		return err;
6124 	}
6125 
6126 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6127 	s->first_displayed_line = 1;
6128 	s->last_displayed_line = view->nlines;
6129 	s->selected_line = 1;
6130 	s->blame_complete = 0;
6131 	s->repo = repo;
6132 	s->commit_id = commit_id;
6133 	memset(&s->blame, 0, sizeof(s->blame));
6134 
6135 	STAILQ_INIT(&s->colors);
6136 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6137 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6138 		    get_color_value("TOG_COLOR_COMMIT"));
6139 		if (err)
6140 			return err;
6141 	}
6142 
6143 	view->show = show_blame_view;
6144 	view->input = input_blame_view;
6145 	view->reset = reset_blame_view;
6146 	view->close = close_blame_view;
6147 	view->search_start = search_start_blame_view;
6148 	view->search_setup = search_setup_blame_view;
6149 	view->search_next = search_next_view_match;
6150 
6151 	return run_blame(view);
6152 }
6153 
6154 static const struct got_error *
6155 close_blame_view(struct tog_view *view)
6156 {
6157 	const struct got_error *err = NULL;
6158 	struct tog_blame_view_state *s = &view->state.blame;
6159 
6160 	if (s->blame.thread)
6161 		err = stop_blame(&s->blame);
6162 
6163 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6164 		struct got_object_qid *blamed_commit;
6165 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6166 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6167 		got_object_qid_free(blamed_commit);
6168 	}
6169 
6170 	free(s->path);
6171 	free_colors(&s->colors);
6172 	return err;
6173 }
6174 
6175 static const struct got_error *
6176 search_start_blame_view(struct tog_view *view)
6177 {
6178 	struct tog_blame_view_state *s = &view->state.blame;
6179 
6180 	s->matched_line = 0;
6181 	return NULL;
6182 }
6183 
6184 static void
6185 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6186     size_t *nlines, int **first, int **last, int **match, int **selected)
6187 {
6188 	struct tog_blame_view_state *s = &view->state.blame;
6189 
6190 	*f = s->blame.f;
6191 	*nlines = s->blame.nlines;
6192 	*line_offsets = s->blame.line_offsets;
6193 	*match = &s->matched_line;
6194 	*first = &s->first_displayed_line;
6195 	*last = &s->last_displayed_line;
6196 	*selected = &s->selected_line;
6197 }
6198 
6199 static const struct got_error *
6200 show_blame_view(struct tog_view *view)
6201 {
6202 	const struct got_error *err = NULL;
6203 	struct tog_blame_view_state *s = &view->state.blame;
6204 	int errcode;
6205 
6206 	if (s->blame.thread == NULL && !s->blame_complete) {
6207 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6208 		    &s->blame.thread_args);
6209 		if (errcode)
6210 			return got_error_set_errno(errcode, "pthread_create");
6211 
6212 		halfdelay(1); /* fast refresh while annotating  */
6213 	}
6214 
6215 	if (s->blame_complete)
6216 		halfdelay(10); /* disable fast refresh */
6217 
6218 	err = draw_blame(view);
6219 
6220 	view_border(view);
6221 	return err;
6222 }
6223 
6224 static const struct got_error *
6225 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6226     struct got_repository *repo, struct got_object_id *id)
6227 {
6228 	struct tog_view		*log_view;
6229 	const struct got_error	*err = NULL;
6230 
6231 	*new_view = NULL;
6232 
6233 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6234 	if (log_view == NULL)
6235 		return got_error_from_errno("view_open");
6236 
6237 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6238 	if (err)
6239 		view_close(log_view);
6240 	else
6241 		*new_view = log_view;
6242 
6243 	return err;
6244 }
6245 
6246 static const struct got_error *
6247 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6248 {
6249 	const struct got_error *err = NULL, *thread_err = NULL;
6250 	struct tog_view *diff_view;
6251 	struct tog_blame_view_state *s = &view->state.blame;
6252 	int eos, nscroll, begin_y = 0, begin_x = 0;
6253 
6254 	eos = nscroll = view->nlines - 2;
6255 	if (view_is_hsplit_top(view))
6256 		--eos;  /* border */
6257 
6258 	switch (ch) {
6259 	case '0':
6260 		view->x = 0;
6261 		break;
6262 	case '$':
6263 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6264 		view->count = 0;
6265 		break;
6266 	case KEY_RIGHT:
6267 	case 'l':
6268 		if (view->x + view->ncols / 3 < view->maxx)
6269 			view->x += 2;  /* move two columns right */
6270 		else
6271 			view->count = 0;
6272 		break;
6273 	case KEY_LEFT:
6274 	case 'h':
6275 		view->x -= MIN(view->x, 2);  /* move two columns back */
6276 		if (view->x <= 0)
6277 			view->count = 0;
6278 		break;
6279 	case 'q':
6280 		s->done = 1;
6281 		break;
6282 	case 'g':
6283 	case KEY_HOME:
6284 		s->selected_line = 1;
6285 		s->first_displayed_line = 1;
6286 		view->count = 0;
6287 		break;
6288 	case 'G':
6289 	case KEY_END:
6290 		if (s->blame.nlines < eos) {
6291 			s->selected_line = s->blame.nlines;
6292 			s->first_displayed_line = 1;
6293 		} else {
6294 			s->selected_line = eos;
6295 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6296 		}
6297 		view->count = 0;
6298 		break;
6299 	case 'k':
6300 	case KEY_UP:
6301 	case CTRL('p'):
6302 		if (s->selected_line > 1)
6303 			s->selected_line--;
6304 		else if (s->selected_line == 1 &&
6305 		    s->first_displayed_line > 1)
6306 			s->first_displayed_line--;
6307 		else
6308 			view->count = 0;
6309 		break;
6310 	case CTRL('u'):
6311 	case 'u':
6312 		nscroll /= 2;
6313 		/* FALL THROUGH */
6314 	case KEY_PPAGE:
6315 	case CTRL('b'):
6316 	case 'b':
6317 		if (s->first_displayed_line == 1) {
6318 			if (view->count > 1)
6319 				nscroll += nscroll;
6320 			s->selected_line = MAX(1, s->selected_line - nscroll);
6321 			view->count = 0;
6322 			break;
6323 		}
6324 		if (s->first_displayed_line > nscroll)
6325 			s->first_displayed_line -= nscroll;
6326 		else
6327 			s->first_displayed_line = 1;
6328 		break;
6329 	case 'j':
6330 	case KEY_DOWN:
6331 	case CTRL('n'):
6332 		if (s->selected_line < eos && s->first_displayed_line +
6333 		    s->selected_line <= s->blame.nlines)
6334 			s->selected_line++;
6335 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6336 			s->first_displayed_line++;
6337 		else
6338 			view->count = 0;
6339 		break;
6340 	case 'c':
6341 	case 'p': {
6342 		struct got_object_id *id = NULL;
6343 
6344 		view->count = 0;
6345 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6346 		    s->first_displayed_line, s->selected_line);
6347 		if (id == NULL)
6348 			break;
6349 		if (ch == 'p') {
6350 			struct got_commit_object *commit, *pcommit;
6351 			struct got_object_qid *pid;
6352 			struct got_object_id *blob_id = NULL;
6353 			int obj_type;
6354 			err = got_object_open_as_commit(&commit,
6355 			    s->repo, id);
6356 			if (err)
6357 				break;
6358 			pid = STAILQ_FIRST(
6359 			    got_object_commit_get_parent_ids(commit));
6360 			if (pid == NULL) {
6361 				got_object_commit_close(commit);
6362 				break;
6363 			}
6364 			/* Check if path history ends here. */
6365 			err = got_object_open_as_commit(&pcommit,
6366 			    s->repo, &pid->id);
6367 			if (err)
6368 				break;
6369 			err = got_object_id_by_path(&blob_id, s->repo,
6370 			    pcommit, s->path);
6371 			got_object_commit_close(pcommit);
6372 			if (err) {
6373 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6374 					err = NULL;
6375 				got_object_commit_close(commit);
6376 				break;
6377 			}
6378 			err = got_object_get_type(&obj_type, s->repo,
6379 			    blob_id);
6380 			free(blob_id);
6381 			/* Can't blame non-blob type objects. */
6382 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6383 				got_object_commit_close(commit);
6384 				break;
6385 			}
6386 			err = got_object_qid_alloc(&s->blamed_commit,
6387 			    &pid->id);
6388 			got_object_commit_close(commit);
6389 		} else {
6390 			if (got_object_id_cmp(id,
6391 			    &s->blamed_commit->id) == 0)
6392 				break;
6393 			err = got_object_qid_alloc(&s->blamed_commit,
6394 			    id);
6395 		}
6396 		if (err)
6397 			break;
6398 		s->done = 1;
6399 		thread_err = stop_blame(&s->blame);
6400 		s->done = 0;
6401 		if (thread_err)
6402 			break;
6403 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6404 		    s->blamed_commit, entry);
6405 		err = run_blame(view);
6406 		if (err)
6407 			break;
6408 		break;
6409 	}
6410 	case 'C': {
6411 		struct got_object_qid *first;
6412 
6413 		view->count = 0;
6414 		first = STAILQ_FIRST(&s->blamed_commits);
6415 		if (!got_object_id_cmp(&first->id, s->commit_id))
6416 			break;
6417 		s->done = 1;
6418 		thread_err = stop_blame(&s->blame);
6419 		s->done = 0;
6420 		if (thread_err)
6421 			break;
6422 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6423 		got_object_qid_free(s->blamed_commit);
6424 		s->blamed_commit =
6425 		    STAILQ_FIRST(&s->blamed_commits);
6426 		err = run_blame(view);
6427 		if (err)
6428 			break;
6429 		break;
6430 	}
6431 	case 'L':
6432 		view->count = 0;
6433 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6434 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6435 		if (s->id_to_log)
6436 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6437 		break;
6438 	case KEY_ENTER:
6439 	case '\r': {
6440 		struct got_object_id *id = NULL;
6441 		struct got_object_qid *pid;
6442 		struct got_commit_object *commit = NULL;
6443 
6444 		view->count = 0;
6445 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6446 		    s->first_displayed_line, s->selected_line);
6447 		if (id == NULL)
6448 			break;
6449 		err = got_object_open_as_commit(&commit, s->repo, id);
6450 		if (err)
6451 			break;
6452 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6453 		if (*new_view) {
6454 			/* traversed from diff view, release diff resources  */
6455 			err = close_diff_view(*new_view);
6456 			if (err)
6457 				break;
6458 			diff_view = *new_view;
6459 		} else {
6460 			if (view_is_parent_view(view))
6461 				view_get_split(view, &begin_y, &begin_x);
6462 
6463 			diff_view = view_open(0, 0, begin_y, begin_x,
6464 			    TOG_VIEW_DIFF);
6465 			if (diff_view == NULL) {
6466 				got_object_commit_close(commit);
6467 				err = got_error_from_errno("view_open");
6468 				break;
6469 			}
6470 		}
6471 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6472 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6473 		got_object_commit_close(commit);
6474 		if (err) {
6475 			view_close(diff_view);
6476 			break;
6477 		}
6478 		s->last_diffed_line = s->first_displayed_line - 1 +
6479 		    s->selected_line;
6480 		if (*new_view)
6481 			break;	/* still open from active diff view */
6482 		if (view_is_parent_view(view) &&
6483 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6484 			err = view_init_hsplit(view, begin_y);
6485 			if (err)
6486 				break;
6487 		}
6488 
6489 		view->focussed = 0;
6490 		diff_view->focussed = 1;
6491 		diff_view->mode = view->mode;
6492 		diff_view->nlines = view->lines - begin_y;
6493 		if (view_is_parent_view(view)) {
6494 			view_transfer_size(diff_view, view);
6495 			err = view_close_child(view);
6496 			if (err)
6497 				break;
6498 			err = view_set_child(view, diff_view);
6499 			if (err)
6500 				break;
6501 			view->focus_child = 1;
6502 		} else
6503 			*new_view = diff_view;
6504 		if (err)
6505 			break;
6506 		break;
6507 	}
6508 	case CTRL('d'):
6509 	case 'd':
6510 		nscroll /= 2;
6511 		/* FALL THROUGH */
6512 	case KEY_NPAGE:
6513 	case CTRL('f'):
6514 	case 'f':
6515 	case ' ':
6516 		if (s->last_displayed_line >= s->blame.nlines &&
6517 		    s->selected_line >= MIN(s->blame.nlines,
6518 		    view->nlines - 2)) {
6519 			view->count = 0;
6520 			break;
6521 		}
6522 		if (s->last_displayed_line >= s->blame.nlines &&
6523 		    s->selected_line < view->nlines - 2) {
6524 			s->selected_line +=
6525 			    MIN(nscroll, s->last_displayed_line -
6526 			    s->first_displayed_line - s->selected_line + 1);
6527 		}
6528 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6529 			s->first_displayed_line += nscroll;
6530 		else
6531 			s->first_displayed_line =
6532 			    s->blame.nlines - (view->nlines - 3);
6533 		break;
6534 	case KEY_RESIZE:
6535 		if (s->selected_line > view->nlines - 2) {
6536 			s->selected_line = MIN(s->blame.nlines,
6537 			    view->nlines - 2);
6538 		}
6539 		break;
6540 	default:
6541 		view->count = 0;
6542 		break;
6543 	}
6544 	return thread_err ? thread_err : err;
6545 }
6546 
6547 static const struct got_error *
6548 reset_blame_view(struct tog_view *view)
6549 {
6550 	const struct got_error *err;
6551 	struct tog_blame_view_state *s = &view->state.blame;
6552 
6553 	view->count = 0;
6554 	s->done = 1;
6555 	err = stop_blame(&s->blame);
6556 	s->done = 0;
6557 	if (err)
6558 		return err;
6559 	return run_blame(view);
6560 }
6561 
6562 static const struct got_error *
6563 cmd_blame(int argc, char *argv[])
6564 {
6565 	const struct got_error *error;
6566 	struct got_repository *repo = NULL;
6567 	struct got_worktree *worktree = NULL;
6568 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6569 	char *link_target = NULL;
6570 	struct got_object_id *commit_id = NULL;
6571 	struct got_commit_object *commit = NULL;
6572 	char *commit_id_str = NULL;
6573 	int ch;
6574 	struct tog_view *view;
6575 	int *pack_fds = NULL;
6576 
6577 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6578 		switch (ch) {
6579 		case 'c':
6580 			commit_id_str = optarg;
6581 			break;
6582 		case 'r':
6583 			repo_path = realpath(optarg, NULL);
6584 			if (repo_path == NULL)
6585 				return got_error_from_errno2("realpath",
6586 				    optarg);
6587 			break;
6588 		default:
6589 			usage_blame();
6590 			/* NOTREACHED */
6591 		}
6592 	}
6593 
6594 	argc -= optind;
6595 	argv += optind;
6596 
6597 	if (argc != 1)
6598 		usage_blame();
6599 
6600 	error = got_repo_pack_fds_open(&pack_fds);
6601 	if (error != NULL)
6602 		goto done;
6603 
6604 	if (repo_path == NULL) {
6605 		cwd = getcwd(NULL, 0);
6606 		if (cwd == NULL)
6607 			return got_error_from_errno("getcwd");
6608 		error = got_worktree_open(&worktree, cwd);
6609 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6610 			goto done;
6611 		if (worktree)
6612 			repo_path =
6613 			    strdup(got_worktree_get_repo_path(worktree));
6614 		else
6615 			repo_path = strdup(cwd);
6616 		if (repo_path == NULL) {
6617 			error = got_error_from_errno("strdup");
6618 			goto done;
6619 		}
6620 	}
6621 
6622 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6623 	if (error != NULL)
6624 		goto done;
6625 
6626 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6627 	    worktree);
6628 	if (error)
6629 		goto done;
6630 
6631 	init_curses();
6632 
6633 	error = apply_unveil(got_repo_get_path(repo), NULL);
6634 	if (error)
6635 		goto done;
6636 
6637 	error = tog_load_refs(repo, 0);
6638 	if (error)
6639 		goto done;
6640 
6641 	if (commit_id_str == NULL) {
6642 		struct got_reference *head_ref;
6643 		error = got_ref_open(&head_ref, repo, worktree ?
6644 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6645 		if (error != NULL)
6646 			goto done;
6647 		error = got_ref_resolve(&commit_id, repo, head_ref);
6648 		got_ref_close(head_ref);
6649 	} else {
6650 		error = got_repo_match_object_id(&commit_id, NULL,
6651 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6652 	}
6653 	if (error != NULL)
6654 		goto done;
6655 
6656 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6657 	if (view == NULL) {
6658 		error = got_error_from_errno("view_open");
6659 		goto done;
6660 	}
6661 
6662 	error = got_object_open_as_commit(&commit, repo, commit_id);
6663 	if (error)
6664 		goto done;
6665 
6666 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6667 	    commit, repo);
6668 	if (error)
6669 		goto done;
6670 
6671 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6672 	    commit_id, repo);
6673 	if (error)
6674 		goto done;
6675 	if (worktree) {
6676 		/* Release work tree lock. */
6677 		got_worktree_close(worktree);
6678 		worktree = NULL;
6679 	}
6680 	error = view_loop(view);
6681 done:
6682 	free(repo_path);
6683 	free(in_repo_path);
6684 	free(link_target);
6685 	free(cwd);
6686 	free(commit_id);
6687 	if (commit)
6688 		got_object_commit_close(commit);
6689 	if (worktree)
6690 		got_worktree_close(worktree);
6691 	if (repo) {
6692 		const struct got_error *close_err = got_repo_close(repo);
6693 		if (error == NULL)
6694 			error = close_err;
6695 	}
6696 	if (pack_fds) {
6697 		const struct got_error *pack_err =
6698 		    got_repo_pack_fds_close(pack_fds);
6699 		if (error == NULL)
6700 			error = pack_err;
6701 	}
6702 	tog_free_refs();
6703 	return error;
6704 }
6705 
6706 static const struct got_error *
6707 draw_tree_entries(struct tog_view *view, const char *parent_path)
6708 {
6709 	struct tog_tree_view_state *s = &view->state.tree;
6710 	const struct got_error *err = NULL;
6711 	struct got_tree_entry *te;
6712 	wchar_t *wline;
6713 	char *index = NULL;
6714 	struct tog_color *tc;
6715 	int width, n, nentries, i = 1;
6716 	int limit = view->nlines;
6717 
6718 	s->ndisplayed = 0;
6719 	if (view_is_hsplit_top(view))
6720 		--limit;  /* border */
6721 
6722 	werase(view->window);
6723 
6724 	if (limit == 0)
6725 		return NULL;
6726 
6727 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6728 	    0, 0);
6729 	if (err)
6730 		return err;
6731 	if (view_needs_focus_indication(view))
6732 		wstandout(view->window);
6733 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6734 	if (tc)
6735 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6736 	waddwstr(view->window, wline);
6737 	free(wline);
6738 	wline = NULL;
6739 	while (width++ < view->ncols)
6740 		waddch(view->window, ' ');
6741 	if (tc)
6742 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6743 	if (view_needs_focus_indication(view))
6744 		wstandend(view->window);
6745 	if (--limit <= 0)
6746 		return NULL;
6747 
6748 	i += s->selected;
6749 	if (s->first_displayed_entry) {
6750 		i += got_tree_entry_get_index(s->first_displayed_entry);
6751 		if (s->tree != s->root)
6752 			++i;  /* account for ".." entry */
6753 	}
6754 	nentries = got_object_tree_get_nentries(s->tree);
6755 	if (asprintf(&index, "[%d/%d] %s",
6756 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6757 		return got_error_from_errno("asprintf");
6758 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6759 	free(index);
6760 	if (err)
6761 		return err;
6762 	waddwstr(view->window, wline);
6763 	free(wline);
6764 	wline = NULL;
6765 	if (width < view->ncols - 1)
6766 		waddch(view->window, '\n');
6767 	if (--limit <= 0)
6768 		return NULL;
6769 	waddch(view->window, '\n');
6770 	if (--limit <= 0)
6771 		return NULL;
6772 
6773 	if (s->first_displayed_entry == NULL) {
6774 		te = got_object_tree_get_first_entry(s->tree);
6775 		if (s->selected == 0) {
6776 			if (view->focussed)
6777 				wstandout(view->window);
6778 			s->selected_entry = NULL;
6779 		}
6780 		waddstr(view->window, "  ..\n");	/* parent directory */
6781 		if (s->selected == 0 && view->focussed)
6782 			wstandend(view->window);
6783 		s->ndisplayed++;
6784 		if (--limit <= 0)
6785 			return NULL;
6786 		n = 1;
6787 	} else {
6788 		n = 0;
6789 		te = s->first_displayed_entry;
6790 	}
6791 
6792 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6793 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6794 		const char *modestr = "";
6795 		mode_t mode;
6796 
6797 		te = got_object_tree_get_entry(s->tree, i);
6798 		mode = got_tree_entry_get_mode(te);
6799 
6800 		if (s->show_ids) {
6801 			err = got_object_id_str(&id_str,
6802 			    got_tree_entry_get_id(te));
6803 			if (err)
6804 				return got_error_from_errno(
6805 				    "got_object_id_str");
6806 		}
6807 		if (got_object_tree_entry_is_submodule(te))
6808 			modestr = "$";
6809 		else if (S_ISLNK(mode)) {
6810 			int i;
6811 
6812 			err = got_tree_entry_get_symlink_target(&link_target,
6813 			    te, s->repo);
6814 			if (err) {
6815 				free(id_str);
6816 				return err;
6817 			}
6818 			for (i = 0; i < strlen(link_target); i++) {
6819 				if (!isprint((unsigned char)link_target[i]))
6820 					link_target[i] = '?';
6821 			}
6822 			modestr = "@";
6823 		}
6824 		else if (S_ISDIR(mode))
6825 			modestr = "/";
6826 		else if (mode & S_IXUSR)
6827 			modestr = "*";
6828 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6829 		    got_tree_entry_get_name(te), modestr,
6830 		    link_target ? " -> ": "",
6831 		    link_target ? link_target : "") == -1) {
6832 			free(id_str);
6833 			free(link_target);
6834 			return got_error_from_errno("asprintf");
6835 		}
6836 		free(id_str);
6837 		free(link_target);
6838 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6839 		    0, 0);
6840 		if (err) {
6841 			free(line);
6842 			break;
6843 		}
6844 		if (n == s->selected) {
6845 			if (view->focussed)
6846 				wstandout(view->window);
6847 			s->selected_entry = te;
6848 		}
6849 		tc = match_color(&s->colors, line);
6850 		if (tc)
6851 			wattr_on(view->window,
6852 			    COLOR_PAIR(tc->colorpair), NULL);
6853 		waddwstr(view->window, wline);
6854 		if (tc)
6855 			wattr_off(view->window,
6856 			    COLOR_PAIR(tc->colorpair), NULL);
6857 		if (width < view->ncols - 1)
6858 			waddch(view->window, '\n');
6859 		if (n == s->selected && view->focussed)
6860 			wstandend(view->window);
6861 		free(line);
6862 		free(wline);
6863 		wline = NULL;
6864 		n++;
6865 		s->ndisplayed++;
6866 		s->last_displayed_entry = te;
6867 		if (--limit <= 0)
6868 			break;
6869 	}
6870 
6871 	return err;
6872 }
6873 
6874 static void
6875 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6876 {
6877 	struct got_tree_entry *te;
6878 	int isroot = s->tree == s->root;
6879 	int i = 0;
6880 
6881 	if (s->first_displayed_entry == NULL)
6882 		return;
6883 
6884 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6885 	while (i++ < maxscroll) {
6886 		if (te == NULL) {
6887 			if (!isroot)
6888 				s->first_displayed_entry = NULL;
6889 			break;
6890 		}
6891 		s->first_displayed_entry = te;
6892 		te = got_tree_entry_get_prev(s->tree, te);
6893 	}
6894 }
6895 
6896 static const struct got_error *
6897 tree_scroll_down(struct tog_view *view, int maxscroll)
6898 {
6899 	struct tog_tree_view_state *s = &view->state.tree;
6900 	struct got_tree_entry *next, *last;
6901 	int n = 0;
6902 
6903 	if (s->first_displayed_entry)
6904 		next = got_tree_entry_get_next(s->tree,
6905 		    s->first_displayed_entry);
6906 	else
6907 		next = got_object_tree_get_first_entry(s->tree);
6908 
6909 	last = s->last_displayed_entry;
6910 	while (next && n++ < maxscroll) {
6911 		if (last) {
6912 			s->last_displayed_entry = last;
6913 			last = got_tree_entry_get_next(s->tree, last);
6914 		}
6915 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6916 			s->first_displayed_entry = next;
6917 			next = got_tree_entry_get_next(s->tree, next);
6918 		}
6919 	}
6920 
6921 	return NULL;
6922 }
6923 
6924 static const struct got_error *
6925 tree_entry_path(char **path, struct tog_parent_trees *parents,
6926     struct got_tree_entry *te)
6927 {
6928 	const struct got_error *err = NULL;
6929 	struct tog_parent_tree *pt;
6930 	size_t len = 2; /* for leading slash and NUL */
6931 
6932 	TAILQ_FOREACH(pt, parents, entry)
6933 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6934 		    + 1 /* slash */;
6935 	if (te)
6936 		len += strlen(got_tree_entry_get_name(te));
6937 
6938 	*path = calloc(1, len);
6939 	if (path == NULL)
6940 		return got_error_from_errno("calloc");
6941 
6942 	(*path)[0] = '/';
6943 	pt = TAILQ_LAST(parents, tog_parent_trees);
6944 	while (pt) {
6945 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6946 		if (strlcat(*path, name, len) >= len) {
6947 			err = got_error(GOT_ERR_NO_SPACE);
6948 			goto done;
6949 		}
6950 		if (strlcat(*path, "/", len) >= len) {
6951 			err = got_error(GOT_ERR_NO_SPACE);
6952 			goto done;
6953 		}
6954 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6955 	}
6956 	if (te) {
6957 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6958 			err = got_error(GOT_ERR_NO_SPACE);
6959 			goto done;
6960 		}
6961 	}
6962 done:
6963 	if (err) {
6964 		free(*path);
6965 		*path = NULL;
6966 	}
6967 	return err;
6968 }
6969 
6970 static const struct got_error *
6971 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6972     struct got_tree_entry *te, struct tog_parent_trees *parents,
6973     struct got_object_id *commit_id, struct got_repository *repo)
6974 {
6975 	const struct got_error *err = NULL;
6976 	char *path;
6977 	struct tog_view *blame_view;
6978 
6979 	*new_view = NULL;
6980 
6981 	err = tree_entry_path(&path, parents, te);
6982 	if (err)
6983 		return err;
6984 
6985 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6986 	if (blame_view == NULL) {
6987 		err = got_error_from_errno("view_open");
6988 		goto done;
6989 	}
6990 
6991 	err = open_blame_view(blame_view, path, commit_id, repo);
6992 	if (err) {
6993 		if (err->code == GOT_ERR_CANCELLED)
6994 			err = NULL;
6995 		view_close(blame_view);
6996 	} else
6997 		*new_view = blame_view;
6998 done:
6999 	free(path);
7000 	return err;
7001 }
7002 
7003 static const struct got_error *
7004 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7005     struct tog_tree_view_state *s)
7006 {
7007 	struct tog_view *log_view;
7008 	const struct got_error *err = NULL;
7009 	char *path;
7010 
7011 	*new_view = NULL;
7012 
7013 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7014 	if (log_view == NULL)
7015 		return got_error_from_errno("view_open");
7016 
7017 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7018 	if (err)
7019 		return err;
7020 
7021 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7022 	    path, 0);
7023 	if (err)
7024 		view_close(log_view);
7025 	else
7026 		*new_view = log_view;
7027 	free(path);
7028 	return err;
7029 }
7030 
7031 static const struct got_error *
7032 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7033     const char *head_ref_name, struct got_repository *repo)
7034 {
7035 	const struct got_error *err = NULL;
7036 	char *commit_id_str = NULL;
7037 	struct tog_tree_view_state *s = &view->state.tree;
7038 	struct got_commit_object *commit = NULL;
7039 
7040 	TAILQ_INIT(&s->parents);
7041 	STAILQ_INIT(&s->colors);
7042 
7043 	s->commit_id = got_object_id_dup(commit_id);
7044 	if (s->commit_id == NULL)
7045 		return got_error_from_errno("got_object_id_dup");
7046 
7047 	err = got_object_open_as_commit(&commit, repo, commit_id);
7048 	if (err)
7049 		goto done;
7050 
7051 	/*
7052 	 * The root is opened here and will be closed when the view is closed.
7053 	 * Any visited subtrees and their path-wise parents are opened and
7054 	 * closed on demand.
7055 	 */
7056 	err = got_object_open_as_tree(&s->root, repo,
7057 	    got_object_commit_get_tree_id(commit));
7058 	if (err)
7059 		goto done;
7060 	s->tree = s->root;
7061 
7062 	err = got_object_id_str(&commit_id_str, commit_id);
7063 	if (err != NULL)
7064 		goto done;
7065 
7066 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7067 		err = got_error_from_errno("asprintf");
7068 		goto done;
7069 	}
7070 
7071 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7072 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7073 	if (head_ref_name) {
7074 		s->head_ref_name = strdup(head_ref_name);
7075 		if (s->head_ref_name == NULL) {
7076 			err = got_error_from_errno("strdup");
7077 			goto done;
7078 		}
7079 	}
7080 	s->repo = repo;
7081 
7082 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7083 		err = add_color(&s->colors, "\\$$",
7084 		    TOG_COLOR_TREE_SUBMODULE,
7085 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7086 		if (err)
7087 			goto done;
7088 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7089 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7090 		if (err)
7091 			goto done;
7092 		err = add_color(&s->colors, "/$",
7093 		    TOG_COLOR_TREE_DIRECTORY,
7094 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7095 		if (err)
7096 			goto done;
7097 
7098 		err = add_color(&s->colors, "\\*$",
7099 		    TOG_COLOR_TREE_EXECUTABLE,
7100 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7101 		if (err)
7102 			goto done;
7103 
7104 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7105 		    get_color_value("TOG_COLOR_COMMIT"));
7106 		if (err)
7107 			goto done;
7108 	}
7109 
7110 	view->show = show_tree_view;
7111 	view->input = input_tree_view;
7112 	view->close = close_tree_view;
7113 	view->search_start = search_start_tree_view;
7114 	view->search_next = search_next_tree_view;
7115 done:
7116 	free(commit_id_str);
7117 	if (commit)
7118 		got_object_commit_close(commit);
7119 	if (err)
7120 		close_tree_view(view);
7121 	return err;
7122 }
7123 
7124 static const struct got_error *
7125 close_tree_view(struct tog_view *view)
7126 {
7127 	struct tog_tree_view_state *s = &view->state.tree;
7128 
7129 	free_colors(&s->colors);
7130 	free(s->tree_label);
7131 	s->tree_label = NULL;
7132 	free(s->commit_id);
7133 	s->commit_id = NULL;
7134 	free(s->head_ref_name);
7135 	s->head_ref_name = NULL;
7136 	while (!TAILQ_EMPTY(&s->parents)) {
7137 		struct tog_parent_tree *parent;
7138 		parent = TAILQ_FIRST(&s->parents);
7139 		TAILQ_REMOVE(&s->parents, parent, entry);
7140 		if (parent->tree != s->root)
7141 			got_object_tree_close(parent->tree);
7142 		free(parent);
7143 
7144 	}
7145 	if (s->tree != NULL && s->tree != s->root)
7146 		got_object_tree_close(s->tree);
7147 	if (s->root)
7148 		got_object_tree_close(s->root);
7149 	return NULL;
7150 }
7151 
7152 static const struct got_error *
7153 search_start_tree_view(struct tog_view *view)
7154 {
7155 	struct tog_tree_view_state *s = &view->state.tree;
7156 
7157 	s->matched_entry = NULL;
7158 	return NULL;
7159 }
7160 
7161 static int
7162 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7163 {
7164 	regmatch_t regmatch;
7165 
7166 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7167 	    0) == 0;
7168 }
7169 
7170 static const struct got_error *
7171 search_next_tree_view(struct tog_view *view)
7172 {
7173 	struct tog_tree_view_state *s = &view->state.tree;
7174 	struct got_tree_entry *te = NULL;
7175 
7176 	if (!view->searching) {
7177 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7178 		return NULL;
7179 	}
7180 
7181 	if (s->matched_entry) {
7182 		if (view->searching == TOG_SEARCH_FORWARD) {
7183 			if (s->selected_entry)
7184 				te = got_tree_entry_get_next(s->tree,
7185 				    s->selected_entry);
7186 			else
7187 				te = got_object_tree_get_first_entry(s->tree);
7188 		} else {
7189 			if (s->selected_entry == NULL)
7190 				te = got_object_tree_get_last_entry(s->tree);
7191 			else
7192 				te = got_tree_entry_get_prev(s->tree,
7193 				    s->selected_entry);
7194 		}
7195 	} else {
7196 		if (s->selected_entry)
7197 			te = s->selected_entry;
7198 		else if (view->searching == TOG_SEARCH_FORWARD)
7199 			te = got_object_tree_get_first_entry(s->tree);
7200 		else
7201 			te = got_object_tree_get_last_entry(s->tree);
7202 	}
7203 
7204 	while (1) {
7205 		if (te == NULL) {
7206 			if (s->matched_entry == NULL) {
7207 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7208 				return NULL;
7209 			}
7210 			if (view->searching == TOG_SEARCH_FORWARD)
7211 				te = got_object_tree_get_first_entry(s->tree);
7212 			else
7213 				te = got_object_tree_get_last_entry(s->tree);
7214 		}
7215 
7216 		if (match_tree_entry(te, &view->regex)) {
7217 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7218 			s->matched_entry = te;
7219 			break;
7220 		}
7221 
7222 		if (view->searching == TOG_SEARCH_FORWARD)
7223 			te = got_tree_entry_get_next(s->tree, te);
7224 		else
7225 			te = got_tree_entry_get_prev(s->tree, te);
7226 	}
7227 
7228 	if (s->matched_entry) {
7229 		s->first_displayed_entry = s->matched_entry;
7230 		s->selected = 0;
7231 	}
7232 
7233 	return NULL;
7234 }
7235 
7236 static const struct got_error *
7237 show_tree_view(struct tog_view *view)
7238 {
7239 	const struct got_error *err = NULL;
7240 	struct tog_tree_view_state *s = &view->state.tree;
7241 	char *parent_path;
7242 
7243 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7244 	if (err)
7245 		return err;
7246 
7247 	err = draw_tree_entries(view, parent_path);
7248 	free(parent_path);
7249 
7250 	view_border(view);
7251 	return err;
7252 }
7253 
7254 static const struct got_error *
7255 tree_goto_line(struct tog_view *view, int nlines)
7256 {
7257 	const struct got_error		 *err = NULL;
7258 	struct tog_tree_view_state	 *s = &view->state.tree;
7259 	struct got_tree_entry		**fte, **lte, **ste;
7260 	int				  g, last, first = 1, i = 1;
7261 	int				  root = s->tree == s->root;
7262 	int				  off = root ? 1 : 2;
7263 
7264 	g = view->gline;
7265 	view->gline = 0;
7266 
7267 	if (g == 0)
7268 		g = 1;
7269 	else if (g > got_object_tree_get_nentries(s->tree))
7270 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7271 
7272 	fte = &s->first_displayed_entry;
7273 	lte = &s->last_displayed_entry;
7274 	ste = &s->selected_entry;
7275 
7276 	if (*fte != NULL) {
7277 		first = got_tree_entry_get_index(*fte);
7278 		first += off;  /* account for ".." */
7279 	}
7280 	last = got_tree_entry_get_index(*lte);
7281 	last += off;
7282 
7283 	if (g >= first && g <= last && g - first < nlines) {
7284 		s->selected = g - first;
7285 		return NULL;	/* gline is on the current page */
7286 	}
7287 
7288 	if (*ste != NULL) {
7289 		i = got_tree_entry_get_index(*ste);
7290 		i += off;
7291 	}
7292 
7293 	if (i < g) {
7294 		err = tree_scroll_down(view, g - i);
7295 		if (err)
7296 			return err;
7297 		if (got_tree_entry_get_index(*lte) >=
7298 		    got_object_tree_get_nentries(s->tree) - 1 &&
7299 		    first + s->selected < g &&
7300 		    s->selected < s->ndisplayed - 1) {
7301 			first = got_tree_entry_get_index(*fte);
7302 			first += off;
7303 			s->selected = g - first;
7304 		}
7305 	} else if (i > g)
7306 		tree_scroll_up(s, i - g);
7307 
7308 	if (g < nlines &&
7309 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7310 		s->selected = g - 1;
7311 
7312 	return NULL;
7313 }
7314 
7315 static const struct got_error *
7316 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7317 {
7318 	const struct got_error *err = NULL;
7319 	struct tog_tree_view_state *s = &view->state.tree;
7320 	struct got_tree_entry *te;
7321 	int n, nscroll = view->nlines - 3;
7322 
7323 	if (view->gline)
7324 		return tree_goto_line(view, nscroll);
7325 
7326 	switch (ch) {
7327 	case 'i':
7328 		s->show_ids = !s->show_ids;
7329 		view->count = 0;
7330 		break;
7331 	case 'L':
7332 		view->count = 0;
7333 		if (!s->selected_entry)
7334 			break;
7335 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7336 		break;
7337 	case 'R':
7338 		view->count = 0;
7339 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7340 		break;
7341 	case 'g':
7342 	case '=':
7343 	case KEY_HOME:
7344 		s->selected = 0;
7345 		view->count = 0;
7346 		if (s->tree == s->root)
7347 			s->first_displayed_entry =
7348 			    got_object_tree_get_first_entry(s->tree);
7349 		else
7350 			s->first_displayed_entry = NULL;
7351 		break;
7352 	case 'G':
7353 	case '*':
7354 	case KEY_END: {
7355 		int eos = view->nlines - 3;
7356 
7357 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7358 			--eos;  /* border */
7359 		s->selected = 0;
7360 		view->count = 0;
7361 		te = got_object_tree_get_last_entry(s->tree);
7362 		for (n = 0; n < eos; n++) {
7363 			if (te == NULL) {
7364 				if (s->tree != s->root) {
7365 					s->first_displayed_entry = NULL;
7366 					n++;
7367 				}
7368 				break;
7369 			}
7370 			s->first_displayed_entry = te;
7371 			te = got_tree_entry_get_prev(s->tree, te);
7372 		}
7373 		if (n > 0)
7374 			s->selected = n - 1;
7375 		break;
7376 	}
7377 	case 'k':
7378 	case KEY_UP:
7379 	case CTRL('p'):
7380 		if (s->selected > 0) {
7381 			s->selected--;
7382 			break;
7383 		}
7384 		tree_scroll_up(s, 1);
7385 		if (s->selected_entry == NULL ||
7386 		    (s->tree == s->root && s->selected_entry ==
7387 		     got_object_tree_get_first_entry(s->tree)))
7388 			view->count = 0;
7389 		break;
7390 	case CTRL('u'):
7391 	case 'u':
7392 		nscroll /= 2;
7393 		/* FALL THROUGH */
7394 	case KEY_PPAGE:
7395 	case CTRL('b'):
7396 	case 'b':
7397 		if (s->tree == s->root) {
7398 			if (got_object_tree_get_first_entry(s->tree) ==
7399 			    s->first_displayed_entry)
7400 				s->selected -= MIN(s->selected, nscroll);
7401 		} else {
7402 			if (s->first_displayed_entry == NULL)
7403 				s->selected -= MIN(s->selected, nscroll);
7404 		}
7405 		tree_scroll_up(s, MAX(0, nscroll));
7406 		if (s->selected_entry == NULL ||
7407 		    (s->tree == s->root && s->selected_entry ==
7408 		     got_object_tree_get_first_entry(s->tree)))
7409 			view->count = 0;
7410 		break;
7411 	case 'j':
7412 	case KEY_DOWN:
7413 	case CTRL('n'):
7414 		if (s->selected < s->ndisplayed - 1) {
7415 			s->selected++;
7416 			break;
7417 		}
7418 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7419 		    == NULL) {
7420 			/* can't scroll any further */
7421 			view->count = 0;
7422 			break;
7423 		}
7424 		tree_scroll_down(view, 1);
7425 		break;
7426 	case CTRL('d'):
7427 	case 'd':
7428 		nscroll /= 2;
7429 		/* FALL THROUGH */
7430 	case KEY_NPAGE:
7431 	case CTRL('f'):
7432 	case 'f':
7433 	case ' ':
7434 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7435 		    == NULL) {
7436 			/* can't scroll any further; move cursor down */
7437 			if (s->selected < s->ndisplayed - 1)
7438 				s->selected += MIN(nscroll,
7439 				    s->ndisplayed - s->selected - 1);
7440 			else
7441 				view->count = 0;
7442 			break;
7443 		}
7444 		tree_scroll_down(view, nscroll);
7445 		break;
7446 	case KEY_ENTER:
7447 	case '\r':
7448 	case KEY_BACKSPACE:
7449 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7450 			struct tog_parent_tree *parent;
7451 			/* user selected '..' */
7452 			if (s->tree == s->root) {
7453 				view->count = 0;
7454 				break;
7455 			}
7456 			parent = TAILQ_FIRST(&s->parents);
7457 			TAILQ_REMOVE(&s->parents, parent,
7458 			    entry);
7459 			got_object_tree_close(s->tree);
7460 			s->tree = parent->tree;
7461 			s->first_displayed_entry =
7462 			    parent->first_displayed_entry;
7463 			s->selected_entry =
7464 			    parent->selected_entry;
7465 			s->selected = parent->selected;
7466 			if (s->selected > view->nlines - 3) {
7467 				err = offset_selection_down(view);
7468 				if (err)
7469 					break;
7470 			}
7471 			free(parent);
7472 		} else if (S_ISDIR(got_tree_entry_get_mode(
7473 		    s->selected_entry))) {
7474 			struct got_tree_object *subtree;
7475 			view->count = 0;
7476 			err = got_object_open_as_tree(&subtree, s->repo,
7477 			    got_tree_entry_get_id(s->selected_entry));
7478 			if (err)
7479 				break;
7480 			err = tree_view_visit_subtree(s, subtree);
7481 			if (err) {
7482 				got_object_tree_close(subtree);
7483 				break;
7484 			}
7485 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7486 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7487 		break;
7488 	case KEY_RESIZE:
7489 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7490 			s->selected = view->nlines - 4;
7491 		view->count = 0;
7492 		break;
7493 	default:
7494 		view->count = 0;
7495 		break;
7496 	}
7497 
7498 	return err;
7499 }
7500 
7501 __dead static void
7502 usage_tree(void)
7503 {
7504 	endwin();
7505 	fprintf(stderr,
7506 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7507 	    getprogname());
7508 	exit(1);
7509 }
7510 
7511 static const struct got_error *
7512 cmd_tree(int argc, char *argv[])
7513 {
7514 	const struct got_error *error;
7515 	struct got_repository *repo = NULL;
7516 	struct got_worktree *worktree = NULL;
7517 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7518 	struct got_object_id *commit_id = NULL;
7519 	struct got_commit_object *commit = NULL;
7520 	const char *commit_id_arg = NULL;
7521 	char *label = NULL;
7522 	struct got_reference *ref = NULL;
7523 	const char *head_ref_name = NULL;
7524 	int ch;
7525 	struct tog_view *view;
7526 	int *pack_fds = NULL;
7527 
7528 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7529 		switch (ch) {
7530 		case 'c':
7531 			commit_id_arg = optarg;
7532 			break;
7533 		case 'r':
7534 			repo_path = realpath(optarg, NULL);
7535 			if (repo_path == NULL)
7536 				return got_error_from_errno2("realpath",
7537 				    optarg);
7538 			break;
7539 		default:
7540 			usage_tree();
7541 			/* NOTREACHED */
7542 		}
7543 	}
7544 
7545 	argc -= optind;
7546 	argv += optind;
7547 
7548 	if (argc > 1)
7549 		usage_tree();
7550 
7551 	error = got_repo_pack_fds_open(&pack_fds);
7552 	if (error != NULL)
7553 		goto done;
7554 
7555 	if (repo_path == NULL) {
7556 		cwd = getcwd(NULL, 0);
7557 		if (cwd == NULL)
7558 			return got_error_from_errno("getcwd");
7559 		error = got_worktree_open(&worktree, cwd);
7560 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7561 			goto done;
7562 		if (worktree)
7563 			repo_path =
7564 			    strdup(got_worktree_get_repo_path(worktree));
7565 		else
7566 			repo_path = strdup(cwd);
7567 		if (repo_path == NULL) {
7568 			error = got_error_from_errno("strdup");
7569 			goto done;
7570 		}
7571 	}
7572 
7573 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7574 	if (error != NULL)
7575 		goto done;
7576 
7577 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7578 	    repo, worktree);
7579 	if (error)
7580 		goto done;
7581 
7582 	init_curses();
7583 
7584 	error = apply_unveil(got_repo_get_path(repo), NULL);
7585 	if (error)
7586 		goto done;
7587 
7588 	error = tog_load_refs(repo, 0);
7589 	if (error)
7590 		goto done;
7591 
7592 	if (commit_id_arg == NULL) {
7593 		error = got_repo_match_object_id(&commit_id, &label,
7594 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7595 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7596 		if (error)
7597 			goto done;
7598 		head_ref_name = label;
7599 	} else {
7600 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7601 		if (error == NULL)
7602 			head_ref_name = got_ref_get_name(ref);
7603 		else if (error->code != GOT_ERR_NOT_REF)
7604 			goto done;
7605 		error = got_repo_match_object_id(&commit_id, NULL,
7606 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7607 		if (error)
7608 			goto done;
7609 	}
7610 
7611 	error = got_object_open_as_commit(&commit, repo, commit_id);
7612 	if (error)
7613 		goto done;
7614 
7615 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7616 	if (view == NULL) {
7617 		error = got_error_from_errno("view_open");
7618 		goto done;
7619 	}
7620 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7621 	if (error)
7622 		goto done;
7623 	if (!got_path_is_root_dir(in_repo_path)) {
7624 		error = tree_view_walk_path(&view->state.tree, commit,
7625 		    in_repo_path);
7626 		if (error)
7627 			goto done;
7628 	}
7629 
7630 	if (worktree) {
7631 		/* Release work tree lock. */
7632 		got_worktree_close(worktree);
7633 		worktree = NULL;
7634 	}
7635 	error = view_loop(view);
7636 done:
7637 	free(repo_path);
7638 	free(cwd);
7639 	free(commit_id);
7640 	free(label);
7641 	if (ref)
7642 		got_ref_close(ref);
7643 	if (repo) {
7644 		const struct got_error *close_err = got_repo_close(repo);
7645 		if (error == NULL)
7646 			error = close_err;
7647 	}
7648 	if (pack_fds) {
7649 		const struct got_error *pack_err =
7650 		    got_repo_pack_fds_close(pack_fds);
7651 		if (error == NULL)
7652 			error = pack_err;
7653 	}
7654 	tog_free_refs();
7655 	return error;
7656 }
7657 
7658 static const struct got_error *
7659 ref_view_load_refs(struct tog_ref_view_state *s)
7660 {
7661 	struct got_reflist_entry *sre;
7662 	struct tog_reflist_entry *re;
7663 
7664 	s->nrefs = 0;
7665 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7666 		if (strncmp(got_ref_get_name(sre->ref),
7667 		    "refs/got/", 9) == 0 &&
7668 		    strncmp(got_ref_get_name(sre->ref),
7669 		    "refs/got/backup/", 16) != 0)
7670 			continue;
7671 
7672 		re = malloc(sizeof(*re));
7673 		if (re == NULL)
7674 			return got_error_from_errno("malloc");
7675 
7676 		re->ref = got_ref_dup(sre->ref);
7677 		if (re->ref == NULL)
7678 			return got_error_from_errno("got_ref_dup");
7679 		re->idx = s->nrefs++;
7680 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7681 	}
7682 
7683 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7684 	return NULL;
7685 }
7686 
7687 static void
7688 ref_view_free_refs(struct tog_ref_view_state *s)
7689 {
7690 	struct tog_reflist_entry *re;
7691 
7692 	while (!TAILQ_EMPTY(&s->refs)) {
7693 		re = TAILQ_FIRST(&s->refs);
7694 		TAILQ_REMOVE(&s->refs, re, entry);
7695 		got_ref_close(re->ref);
7696 		free(re);
7697 	}
7698 }
7699 
7700 static const struct got_error *
7701 open_ref_view(struct tog_view *view, struct got_repository *repo)
7702 {
7703 	const struct got_error *err = NULL;
7704 	struct tog_ref_view_state *s = &view->state.ref;
7705 
7706 	s->selected_entry = 0;
7707 	s->repo = repo;
7708 
7709 	TAILQ_INIT(&s->refs);
7710 	STAILQ_INIT(&s->colors);
7711 
7712 	err = ref_view_load_refs(s);
7713 	if (err)
7714 		return err;
7715 
7716 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7717 		err = add_color(&s->colors, "^refs/heads/",
7718 		    TOG_COLOR_REFS_HEADS,
7719 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7720 		if (err)
7721 			goto done;
7722 
7723 		err = add_color(&s->colors, "^refs/tags/",
7724 		    TOG_COLOR_REFS_TAGS,
7725 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7726 		if (err)
7727 			goto done;
7728 
7729 		err = add_color(&s->colors, "^refs/remotes/",
7730 		    TOG_COLOR_REFS_REMOTES,
7731 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7732 		if (err)
7733 			goto done;
7734 
7735 		err = add_color(&s->colors, "^refs/got/backup/",
7736 		    TOG_COLOR_REFS_BACKUP,
7737 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7738 		if (err)
7739 			goto done;
7740 	}
7741 
7742 	view->show = show_ref_view;
7743 	view->input = input_ref_view;
7744 	view->close = close_ref_view;
7745 	view->search_start = search_start_ref_view;
7746 	view->search_next = search_next_ref_view;
7747 done:
7748 	if (err)
7749 		free_colors(&s->colors);
7750 	return err;
7751 }
7752 
7753 static const struct got_error *
7754 close_ref_view(struct tog_view *view)
7755 {
7756 	struct tog_ref_view_state *s = &view->state.ref;
7757 
7758 	ref_view_free_refs(s);
7759 	free_colors(&s->colors);
7760 
7761 	return NULL;
7762 }
7763 
7764 static const struct got_error *
7765 resolve_reflist_entry(struct got_object_id **commit_id,
7766     struct tog_reflist_entry *re, struct got_repository *repo)
7767 {
7768 	const struct got_error *err = NULL;
7769 	struct got_object_id *obj_id;
7770 	struct got_tag_object *tag = NULL;
7771 	int obj_type;
7772 
7773 	*commit_id = NULL;
7774 
7775 	err = got_ref_resolve(&obj_id, repo, re->ref);
7776 	if (err)
7777 		return err;
7778 
7779 	err = got_object_get_type(&obj_type, repo, obj_id);
7780 	if (err)
7781 		goto done;
7782 
7783 	switch (obj_type) {
7784 	case GOT_OBJ_TYPE_COMMIT:
7785 		*commit_id = obj_id;
7786 		break;
7787 	case GOT_OBJ_TYPE_TAG:
7788 		err = got_object_open_as_tag(&tag, repo, obj_id);
7789 		if (err)
7790 			goto done;
7791 		free(obj_id);
7792 		err = got_object_get_type(&obj_type, repo,
7793 		    got_object_tag_get_object_id(tag));
7794 		if (err)
7795 			goto done;
7796 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7797 			err = got_error(GOT_ERR_OBJ_TYPE);
7798 			goto done;
7799 		}
7800 		*commit_id = got_object_id_dup(
7801 		    got_object_tag_get_object_id(tag));
7802 		if (*commit_id == NULL) {
7803 			err = got_error_from_errno("got_object_id_dup");
7804 			goto done;
7805 		}
7806 		break;
7807 	default:
7808 		err = got_error(GOT_ERR_OBJ_TYPE);
7809 		break;
7810 	}
7811 
7812 done:
7813 	if (tag)
7814 		got_object_tag_close(tag);
7815 	if (err) {
7816 		free(*commit_id);
7817 		*commit_id = NULL;
7818 	}
7819 	return err;
7820 }
7821 
7822 static const struct got_error *
7823 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7824     struct tog_reflist_entry *re, struct got_repository *repo)
7825 {
7826 	struct tog_view *log_view;
7827 	const struct got_error *err = NULL;
7828 	struct got_object_id *commit_id = NULL;
7829 
7830 	*new_view = NULL;
7831 
7832 	err = resolve_reflist_entry(&commit_id, re, repo);
7833 	if (err) {
7834 		if (err->code != GOT_ERR_OBJ_TYPE)
7835 			return err;
7836 		else
7837 			return NULL;
7838 	}
7839 
7840 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7841 	if (log_view == NULL) {
7842 		err = got_error_from_errno("view_open");
7843 		goto done;
7844 	}
7845 
7846 	err = open_log_view(log_view, commit_id, repo,
7847 	    got_ref_get_name(re->ref), "", 0);
7848 done:
7849 	if (err)
7850 		view_close(log_view);
7851 	else
7852 		*new_view = log_view;
7853 	free(commit_id);
7854 	return err;
7855 }
7856 
7857 static void
7858 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7859 {
7860 	struct tog_reflist_entry *re;
7861 	int i = 0;
7862 
7863 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7864 		return;
7865 
7866 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7867 	while (i++ < maxscroll) {
7868 		if (re == NULL)
7869 			break;
7870 		s->first_displayed_entry = re;
7871 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7872 	}
7873 }
7874 
7875 static const struct got_error *
7876 ref_scroll_down(struct tog_view *view, int maxscroll)
7877 {
7878 	struct tog_ref_view_state *s = &view->state.ref;
7879 	struct tog_reflist_entry *next, *last;
7880 	int n = 0;
7881 
7882 	if (s->first_displayed_entry)
7883 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7884 	else
7885 		next = TAILQ_FIRST(&s->refs);
7886 
7887 	last = s->last_displayed_entry;
7888 	while (next && n++ < maxscroll) {
7889 		if (last) {
7890 			s->last_displayed_entry = last;
7891 			last = TAILQ_NEXT(last, entry);
7892 		}
7893 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7894 			s->first_displayed_entry = next;
7895 			next = TAILQ_NEXT(next, entry);
7896 		}
7897 	}
7898 
7899 	return NULL;
7900 }
7901 
7902 static const struct got_error *
7903 search_start_ref_view(struct tog_view *view)
7904 {
7905 	struct tog_ref_view_state *s = &view->state.ref;
7906 
7907 	s->matched_entry = NULL;
7908 	return NULL;
7909 }
7910 
7911 static int
7912 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7913 {
7914 	regmatch_t regmatch;
7915 
7916 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7917 	    0) == 0;
7918 }
7919 
7920 static const struct got_error *
7921 search_next_ref_view(struct tog_view *view)
7922 {
7923 	struct tog_ref_view_state *s = &view->state.ref;
7924 	struct tog_reflist_entry *re = NULL;
7925 
7926 	if (!view->searching) {
7927 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7928 		return NULL;
7929 	}
7930 
7931 	if (s->matched_entry) {
7932 		if (view->searching == TOG_SEARCH_FORWARD) {
7933 			if (s->selected_entry)
7934 				re = TAILQ_NEXT(s->selected_entry, entry);
7935 			else
7936 				re = TAILQ_PREV(s->selected_entry,
7937 				    tog_reflist_head, entry);
7938 		} else {
7939 			if (s->selected_entry == NULL)
7940 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7941 			else
7942 				re = TAILQ_PREV(s->selected_entry,
7943 				    tog_reflist_head, entry);
7944 		}
7945 	} else {
7946 		if (s->selected_entry)
7947 			re = s->selected_entry;
7948 		else if (view->searching == TOG_SEARCH_FORWARD)
7949 			re = TAILQ_FIRST(&s->refs);
7950 		else
7951 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7952 	}
7953 
7954 	while (1) {
7955 		if (re == NULL) {
7956 			if (s->matched_entry == NULL) {
7957 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7958 				return NULL;
7959 			}
7960 			if (view->searching == TOG_SEARCH_FORWARD)
7961 				re = TAILQ_FIRST(&s->refs);
7962 			else
7963 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7964 		}
7965 
7966 		if (match_reflist_entry(re, &view->regex)) {
7967 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7968 			s->matched_entry = re;
7969 			break;
7970 		}
7971 
7972 		if (view->searching == TOG_SEARCH_FORWARD)
7973 			re = TAILQ_NEXT(re, entry);
7974 		else
7975 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7976 	}
7977 
7978 	if (s->matched_entry) {
7979 		s->first_displayed_entry = s->matched_entry;
7980 		s->selected = 0;
7981 	}
7982 
7983 	return NULL;
7984 }
7985 
7986 static const struct got_error *
7987 show_ref_view(struct tog_view *view)
7988 {
7989 	const struct got_error *err = NULL;
7990 	struct tog_ref_view_state *s = &view->state.ref;
7991 	struct tog_reflist_entry *re;
7992 	char *line = NULL;
7993 	wchar_t *wline;
7994 	struct tog_color *tc;
7995 	int width, n;
7996 	int limit = view->nlines;
7997 
7998 	werase(view->window);
7999 
8000 	s->ndisplayed = 0;
8001 	if (view_is_hsplit_top(view))
8002 		--limit;  /* border */
8003 
8004 	if (limit == 0)
8005 		return NULL;
8006 
8007 	re = s->first_displayed_entry;
8008 
8009 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8010 	    s->nrefs) == -1)
8011 		return got_error_from_errno("asprintf");
8012 
8013 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8014 	if (err) {
8015 		free(line);
8016 		return err;
8017 	}
8018 	if (view_needs_focus_indication(view))
8019 		wstandout(view->window);
8020 	waddwstr(view->window, wline);
8021 	while (width++ < view->ncols)
8022 		waddch(view->window, ' ');
8023 	if (view_needs_focus_indication(view))
8024 		wstandend(view->window);
8025 	free(wline);
8026 	wline = NULL;
8027 	free(line);
8028 	line = NULL;
8029 	if (--limit <= 0)
8030 		return NULL;
8031 
8032 	n = 0;
8033 	while (re && limit > 0) {
8034 		char *line = NULL;
8035 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8036 
8037 		if (s->show_date) {
8038 			struct got_commit_object *ci;
8039 			struct got_tag_object *tag;
8040 			struct got_object_id *id;
8041 			struct tm tm;
8042 			time_t t;
8043 
8044 			err = got_ref_resolve(&id, s->repo, re->ref);
8045 			if (err)
8046 				return err;
8047 			err = got_object_open_as_tag(&tag, s->repo, id);
8048 			if (err) {
8049 				if (err->code != GOT_ERR_OBJ_TYPE) {
8050 					free(id);
8051 					return err;
8052 				}
8053 				err = got_object_open_as_commit(&ci, s->repo,
8054 				    id);
8055 				if (err) {
8056 					free(id);
8057 					return err;
8058 				}
8059 				t = got_object_commit_get_committer_time(ci);
8060 				got_object_commit_close(ci);
8061 			} else {
8062 				t = got_object_tag_get_tagger_time(tag);
8063 				got_object_tag_close(tag);
8064 			}
8065 			free(id);
8066 			if (gmtime_r(&t, &tm) == NULL)
8067 				return got_error_from_errno("gmtime_r");
8068 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8069 				return got_error(GOT_ERR_NO_SPACE);
8070 		}
8071 		if (got_ref_is_symbolic(re->ref)) {
8072 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8073 			    ymd : "", got_ref_get_name(re->ref),
8074 			    got_ref_get_symref_target(re->ref)) == -1)
8075 				return got_error_from_errno("asprintf");
8076 		} else if (s->show_ids) {
8077 			struct got_object_id *id;
8078 			char *id_str;
8079 			err = got_ref_resolve(&id, s->repo, re->ref);
8080 			if (err)
8081 				return err;
8082 			err = got_object_id_str(&id_str, id);
8083 			if (err) {
8084 				free(id);
8085 				return err;
8086 			}
8087 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8088 			    got_ref_get_name(re->ref), id_str) == -1) {
8089 				err = got_error_from_errno("asprintf");
8090 				free(id);
8091 				free(id_str);
8092 				return err;
8093 			}
8094 			free(id);
8095 			free(id_str);
8096 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8097 		    got_ref_get_name(re->ref)) == -1)
8098 			return got_error_from_errno("asprintf");
8099 
8100 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8101 		    0, 0);
8102 		if (err) {
8103 			free(line);
8104 			return err;
8105 		}
8106 		if (n == s->selected) {
8107 			if (view->focussed)
8108 				wstandout(view->window);
8109 			s->selected_entry = re;
8110 		}
8111 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8112 		if (tc)
8113 			wattr_on(view->window,
8114 			    COLOR_PAIR(tc->colorpair), NULL);
8115 		waddwstr(view->window, wline);
8116 		if (tc)
8117 			wattr_off(view->window,
8118 			    COLOR_PAIR(tc->colorpair), NULL);
8119 		if (width < view->ncols - 1)
8120 			waddch(view->window, '\n');
8121 		if (n == s->selected && view->focussed)
8122 			wstandend(view->window);
8123 		free(line);
8124 		free(wline);
8125 		wline = NULL;
8126 		n++;
8127 		s->ndisplayed++;
8128 		s->last_displayed_entry = re;
8129 
8130 		limit--;
8131 		re = TAILQ_NEXT(re, entry);
8132 	}
8133 
8134 	view_border(view);
8135 	return err;
8136 }
8137 
8138 static const struct got_error *
8139 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8140     struct tog_reflist_entry *re, struct got_repository *repo)
8141 {
8142 	const struct got_error *err = NULL;
8143 	struct got_object_id *commit_id = NULL;
8144 	struct tog_view *tree_view;
8145 
8146 	*new_view = NULL;
8147 
8148 	err = resolve_reflist_entry(&commit_id, re, repo);
8149 	if (err) {
8150 		if (err->code != GOT_ERR_OBJ_TYPE)
8151 			return err;
8152 		else
8153 			return NULL;
8154 	}
8155 
8156 
8157 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8158 	if (tree_view == NULL) {
8159 		err = got_error_from_errno("view_open");
8160 		goto done;
8161 	}
8162 
8163 	err = open_tree_view(tree_view, commit_id,
8164 	    got_ref_get_name(re->ref), repo);
8165 	if (err)
8166 		goto done;
8167 
8168 	*new_view = tree_view;
8169 done:
8170 	free(commit_id);
8171 	return err;
8172 }
8173 
8174 static const struct got_error *
8175 ref_goto_line(struct tog_view *view, int nlines)
8176 {
8177 	const struct got_error		*err = NULL;
8178 	struct tog_ref_view_state	*s = &view->state.ref;
8179 	int				 g, idx = s->selected_entry->idx;
8180 
8181 	g = view->gline;
8182 	view->gline = 0;
8183 
8184 	if (g == 0)
8185 		g = 1;
8186 	else if (g > s->nrefs)
8187 		g = s->nrefs;
8188 
8189 	if (g >= s->first_displayed_entry->idx + 1 &&
8190 	    g <= s->last_displayed_entry->idx + 1 &&
8191 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8192 		s->selected = g - s->first_displayed_entry->idx - 1;
8193 		return NULL;
8194 	}
8195 
8196 	if (idx + 1 < g) {
8197 		err = ref_scroll_down(view, g - idx - 1);
8198 		if (err)
8199 			return err;
8200 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8201 		    s->first_displayed_entry->idx + s->selected < g &&
8202 		    s->selected < s->ndisplayed - 1)
8203 			s->selected = g - s->first_displayed_entry->idx - 1;
8204 	} else if (idx + 1 > g)
8205 		ref_scroll_up(s, idx - g + 1);
8206 
8207 	if (g < nlines && s->first_displayed_entry->idx == 0)
8208 		s->selected = g - 1;
8209 
8210 	return NULL;
8211 
8212 }
8213 
8214 static const struct got_error *
8215 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8216 {
8217 	const struct got_error *err = NULL;
8218 	struct tog_ref_view_state *s = &view->state.ref;
8219 	struct tog_reflist_entry *re;
8220 	int n, nscroll = view->nlines - 1;
8221 
8222 	if (view->gline)
8223 		return ref_goto_line(view, nscroll);
8224 
8225 	switch (ch) {
8226 	case 'i':
8227 		s->show_ids = !s->show_ids;
8228 		view->count = 0;
8229 		break;
8230 	case 'm':
8231 		s->show_date = !s->show_date;
8232 		view->count = 0;
8233 		break;
8234 	case 'o':
8235 		s->sort_by_date = !s->sort_by_date;
8236 		view->count = 0;
8237 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8238 		    got_ref_cmp_by_commit_timestamp_descending :
8239 		    tog_ref_cmp_by_name, s->repo);
8240 		if (err)
8241 			break;
8242 		got_reflist_object_id_map_free(tog_refs_idmap);
8243 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8244 		    &tog_refs, s->repo);
8245 		if (err)
8246 			break;
8247 		ref_view_free_refs(s);
8248 		err = ref_view_load_refs(s);
8249 		break;
8250 	case KEY_ENTER:
8251 	case '\r':
8252 		view->count = 0;
8253 		if (!s->selected_entry)
8254 			break;
8255 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8256 		break;
8257 	case 'T':
8258 		view->count = 0;
8259 		if (!s->selected_entry)
8260 			break;
8261 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8262 		break;
8263 	case 'g':
8264 	case '=':
8265 	case KEY_HOME:
8266 		s->selected = 0;
8267 		view->count = 0;
8268 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8269 		break;
8270 	case 'G':
8271 	case '*':
8272 	case KEY_END: {
8273 		int eos = view->nlines - 1;
8274 
8275 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8276 			--eos;  /* border */
8277 		s->selected = 0;
8278 		view->count = 0;
8279 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8280 		for (n = 0; n < eos; n++) {
8281 			if (re == NULL)
8282 				break;
8283 			s->first_displayed_entry = re;
8284 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8285 		}
8286 		if (n > 0)
8287 			s->selected = n - 1;
8288 		break;
8289 	}
8290 	case 'k':
8291 	case KEY_UP:
8292 	case CTRL('p'):
8293 		if (s->selected > 0) {
8294 			s->selected--;
8295 			break;
8296 		}
8297 		ref_scroll_up(s, 1);
8298 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8299 			view->count = 0;
8300 		break;
8301 	case CTRL('u'):
8302 	case 'u':
8303 		nscroll /= 2;
8304 		/* FALL THROUGH */
8305 	case KEY_PPAGE:
8306 	case CTRL('b'):
8307 	case 'b':
8308 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8309 			s->selected -= MIN(nscroll, s->selected);
8310 		ref_scroll_up(s, MAX(0, nscroll));
8311 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8312 			view->count = 0;
8313 		break;
8314 	case 'j':
8315 	case KEY_DOWN:
8316 	case CTRL('n'):
8317 		if (s->selected < s->ndisplayed - 1) {
8318 			s->selected++;
8319 			break;
8320 		}
8321 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8322 			/* can't scroll any further */
8323 			view->count = 0;
8324 			break;
8325 		}
8326 		ref_scroll_down(view, 1);
8327 		break;
8328 	case CTRL('d'):
8329 	case 'd':
8330 		nscroll /= 2;
8331 		/* FALL THROUGH */
8332 	case KEY_NPAGE:
8333 	case CTRL('f'):
8334 	case 'f':
8335 	case ' ':
8336 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8337 			/* can't scroll any further; move cursor down */
8338 			if (s->selected < s->ndisplayed - 1)
8339 				s->selected += MIN(nscroll,
8340 				    s->ndisplayed - s->selected - 1);
8341 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8342 				s->selected += s->ndisplayed - s->selected - 1;
8343 			view->count = 0;
8344 			break;
8345 		}
8346 		ref_scroll_down(view, nscroll);
8347 		break;
8348 	case CTRL('l'):
8349 		view->count = 0;
8350 		tog_free_refs();
8351 		err = tog_load_refs(s->repo, s->sort_by_date);
8352 		if (err)
8353 			break;
8354 		ref_view_free_refs(s);
8355 		err = ref_view_load_refs(s);
8356 		break;
8357 	case KEY_RESIZE:
8358 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8359 			s->selected = view->nlines - 2;
8360 		break;
8361 	default:
8362 		view->count = 0;
8363 		break;
8364 	}
8365 
8366 	return err;
8367 }
8368 
8369 __dead static void
8370 usage_ref(void)
8371 {
8372 	endwin();
8373 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8374 	    getprogname());
8375 	exit(1);
8376 }
8377 
8378 static const struct got_error *
8379 cmd_ref(int argc, char *argv[])
8380 {
8381 	const struct got_error *error;
8382 	struct got_repository *repo = NULL;
8383 	struct got_worktree *worktree = NULL;
8384 	char *cwd = NULL, *repo_path = NULL;
8385 	int ch;
8386 	struct tog_view *view;
8387 	int *pack_fds = NULL;
8388 
8389 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8390 		switch (ch) {
8391 		case 'r':
8392 			repo_path = realpath(optarg, NULL);
8393 			if (repo_path == NULL)
8394 				return got_error_from_errno2("realpath",
8395 				    optarg);
8396 			break;
8397 		default:
8398 			usage_ref();
8399 			/* NOTREACHED */
8400 		}
8401 	}
8402 
8403 	argc -= optind;
8404 	argv += optind;
8405 
8406 	if (argc > 1)
8407 		usage_ref();
8408 
8409 	error = got_repo_pack_fds_open(&pack_fds);
8410 	if (error != NULL)
8411 		goto done;
8412 
8413 	if (repo_path == NULL) {
8414 		cwd = getcwd(NULL, 0);
8415 		if (cwd == NULL)
8416 			return got_error_from_errno("getcwd");
8417 		error = got_worktree_open(&worktree, cwd);
8418 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8419 			goto done;
8420 		if (worktree)
8421 			repo_path =
8422 			    strdup(got_worktree_get_repo_path(worktree));
8423 		else
8424 			repo_path = strdup(cwd);
8425 		if (repo_path == NULL) {
8426 			error = got_error_from_errno("strdup");
8427 			goto done;
8428 		}
8429 	}
8430 
8431 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8432 	if (error != NULL)
8433 		goto done;
8434 
8435 	init_curses();
8436 
8437 	error = apply_unveil(got_repo_get_path(repo), NULL);
8438 	if (error)
8439 		goto done;
8440 
8441 	error = tog_load_refs(repo, 0);
8442 	if (error)
8443 		goto done;
8444 
8445 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8446 	if (view == NULL) {
8447 		error = got_error_from_errno("view_open");
8448 		goto done;
8449 	}
8450 
8451 	error = open_ref_view(view, repo);
8452 	if (error)
8453 		goto done;
8454 
8455 	if (worktree) {
8456 		/* Release work tree lock. */
8457 		got_worktree_close(worktree);
8458 		worktree = NULL;
8459 	}
8460 	error = view_loop(view);
8461 done:
8462 	free(repo_path);
8463 	free(cwd);
8464 	if (repo) {
8465 		const struct got_error *close_err = got_repo_close(repo);
8466 		if (close_err)
8467 			error = close_err;
8468 	}
8469 	if (pack_fds) {
8470 		const struct got_error *pack_err =
8471 		    got_repo_pack_fds_close(pack_fds);
8472 		if (error == NULL)
8473 			error = pack_err;
8474 	}
8475 	tog_free_refs();
8476 	return error;
8477 }
8478 
8479 static const struct got_error*
8480 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8481     const char *str)
8482 {
8483 	size_t len;
8484 
8485 	if (win == NULL)
8486 		win = stdscr;
8487 
8488 	len = strlen(str);
8489 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8490 
8491 	if (focus)
8492 		wstandout(win);
8493 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8494 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8495 	if (focus)
8496 		wstandend(win);
8497 
8498 	return NULL;
8499 }
8500 
8501 static const struct got_error *
8502 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8503 {
8504 	off_t *p;
8505 
8506 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8507 	if (p == NULL) {
8508 		free(*line_offsets);
8509 		*line_offsets = NULL;
8510 		return got_error_from_errno("reallocarray");
8511 	}
8512 
8513 	*line_offsets = p;
8514 	(*line_offsets)[*nlines] = off;
8515 	++(*nlines);
8516 	return NULL;
8517 }
8518 
8519 static const struct got_error *
8520 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8521 {
8522 	*ret = 0;
8523 
8524 	for (;n > 0; --n, ++km) {
8525 		char	*t0, *t, *k;
8526 		size_t	 len = 1;
8527 
8528 		if (km->keys == NULL)
8529 			continue;
8530 
8531 		t = t0 = strdup(km->keys);
8532 		if (t0 == NULL)
8533 			return got_error_from_errno("strdup");
8534 
8535 		len += strlen(t);
8536 		while ((k = strsep(&t, " ")) != NULL)
8537 			len += strlen(k) > 1 ? 2 : 0;
8538 		free(t0);
8539 		*ret = MAX(*ret, len);
8540 	}
8541 
8542 	return NULL;
8543 }
8544 
8545 /*
8546  * Write keymap section headers, keys, and key info in km to f.
8547  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8548  * wrap control and symbolic keys in guillemets, else use <>.
8549  */
8550 static const struct got_error *
8551 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8552 {
8553 	int n, len = width;
8554 
8555 	if (km->keys) {
8556 		static const char *u8_glyph[] = {
8557 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8558 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8559 		};
8560 		char	*t0, *t, *k;
8561 		int	 cs, s, first = 1;
8562 
8563 		cs = got_locale_is_utf8();
8564 
8565 		t = t0 = strdup(km->keys);
8566 		if (t0 == NULL)
8567 			return got_error_from_errno("strdup");
8568 
8569 		len = strlen(km->keys);
8570 		while ((k = strsep(&t, " ")) != NULL) {
8571 			s = strlen(k) > 1;  /* control or symbolic key */
8572 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8573 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8574 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8575 			if (n < 0) {
8576 				free(t0);
8577 				return got_error_from_errno("fprintf");
8578 			}
8579 			first = 0;
8580 			len += s ? 2 : 0;
8581 			*off += n;
8582 		}
8583 		free(t0);
8584 	}
8585 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8586 	if (n < 0)
8587 		return got_error_from_errno("fprintf");
8588 	*off += n;
8589 
8590 	return NULL;
8591 }
8592 
8593 static const struct got_error *
8594 format_help(struct tog_help_view_state *s)
8595 {
8596 	const struct got_error		*err = NULL;
8597 	off_t				 off = 0;
8598 	int				 i, max, n, show = s->all;
8599 	static const struct tog_key_map	 km[] = {
8600 #define KEYMAP_(info, type)	{ NULL, (info), type }
8601 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8602 		GENERATE_HELP
8603 #undef KEYMAP_
8604 #undef KEY_
8605 	};
8606 
8607 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8608 	if (err)
8609 		return err;
8610 
8611 	n = nitems(km);
8612 	err = max_key_str(&max, km, n);
8613 	if (err)
8614 		return err;
8615 
8616 	for (i = 0; i < n; ++i) {
8617 		if (km[i].keys == NULL) {
8618 			show = s->all;
8619 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8620 			    km[i].type == s->type || s->all)
8621 				show = 1;
8622 		}
8623 		if (show) {
8624 			err = format_help_line(&off, s->f, &km[i], max);
8625 			if (err)
8626 				return err;
8627 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8628 			if (err)
8629 				return err;
8630 		}
8631 	}
8632 	fputc('\n', s->f);
8633 	++off;
8634 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8635 	return err;
8636 }
8637 
8638 static const struct got_error *
8639 create_help(struct tog_help_view_state *s)
8640 {
8641 	FILE			*f;
8642 	const struct got_error	*err;
8643 
8644 	free(s->line_offsets);
8645 	s->line_offsets = NULL;
8646 	s->nlines = 0;
8647 
8648 	f = got_opentemp();
8649 	if (f == NULL)
8650 		return got_error_from_errno("got_opentemp");
8651 	s->f = f;
8652 
8653 	err = format_help(s);
8654 	if (err)
8655 		return err;
8656 
8657 	if (s->f && fflush(s->f) != 0)
8658 		return got_error_from_errno("fflush");
8659 
8660 	return NULL;
8661 }
8662 
8663 static const struct got_error *
8664 search_start_help_view(struct tog_view *view)
8665 {
8666 	view->state.help.matched_line = 0;
8667 	return NULL;
8668 }
8669 
8670 static void
8671 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8672     size_t *nlines, int **first, int **last, int **match, int **selected)
8673 {
8674 	struct tog_help_view_state *s = &view->state.help;
8675 
8676 	*f = s->f;
8677 	*nlines = s->nlines;
8678 	*line_offsets = s->line_offsets;
8679 	*match = &s->matched_line;
8680 	*first = &s->first_displayed_line;
8681 	*last = &s->last_displayed_line;
8682 	*selected = &s->selected_line;
8683 }
8684 
8685 static const struct got_error *
8686 show_help_view(struct tog_view *view)
8687 {
8688 	struct tog_help_view_state	*s = &view->state.help;
8689 	const struct got_error		*err;
8690 	regmatch_t			*regmatch = &view->regmatch;
8691 	wchar_t				*wline;
8692 	char				*line;
8693 	ssize_t				 linelen;
8694 	size_t				 linesz = 0;
8695 	int				 width, nprinted = 0, rc = 0;
8696 	int				 eos = view->nlines;
8697 
8698 	if (view_is_hsplit_top(view))
8699 		--eos;  /* account for border */
8700 
8701 	s->lineno = 0;
8702 	rewind(s->f);
8703 	werase(view->window);
8704 
8705 	if (view->gline > s->nlines - 1)
8706 		view->gline = s->nlines - 1;
8707 
8708 	err = win_draw_center(view->window, 0, 0, view->ncols,
8709 	    view_needs_focus_indication(view),
8710 	    "tog help (press q to return to tog)");
8711 	if (err)
8712 		return err;
8713 	if (eos <= 1)
8714 		return NULL;
8715 	waddstr(view->window, "\n\n");
8716 	eos -= 2;
8717 
8718 	s->eof = 0;
8719 	view->maxx = 0;
8720 	line = NULL;
8721 	while (eos > 0 && nprinted < eos) {
8722 		attr_t attr = 0;
8723 
8724 		linelen = getline(&line, &linesz, s->f);
8725 		if (linelen == -1) {
8726 			if (!feof(s->f)) {
8727 				free(line);
8728 				return got_ferror(s->f, GOT_ERR_IO);
8729 			}
8730 			s->eof = 1;
8731 			break;
8732 		}
8733 		if (++s->lineno < s->first_displayed_line)
8734 			continue;
8735 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8736 			continue;
8737 		if (s->lineno == view->hiline)
8738 			attr = A_STANDOUT;
8739 
8740 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8741 		    view->x ? 1 : 0);
8742 		if (err) {
8743 			free(line);
8744 			return err;
8745 		}
8746 		view->maxx = MAX(view->maxx, width);
8747 		free(wline);
8748 		wline = NULL;
8749 
8750 		if (attr)
8751 			wattron(view->window, attr);
8752 		if (s->first_displayed_line + nprinted == s->matched_line &&
8753 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8754 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8755 			    view->window, view->x, regmatch);
8756 			if (err) {
8757 				free(line);
8758 				return err;
8759 			}
8760 		} else {
8761 			int skip;
8762 
8763 			err = format_line(&wline, &width, &skip, line,
8764 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8765 			if (err) {
8766 				free(line);
8767 				return err;
8768 			}
8769 			rc = waddwstr(view->window, &wline[skip]);
8770 			free(wline);
8771 			wline = NULL;
8772 			if (rc == ERR)
8773 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8774 		}
8775 		if (s->lineno == view->hiline) {
8776 			while (width++ < view->ncols)
8777 				waddch(view->window, ' ');
8778 		} else {
8779 			if (width <= view->ncols)
8780 				waddch(view->window, '\n');
8781 		}
8782 		if (attr)
8783 			wattroff(view->window, attr);
8784 		if (++nprinted == 1)
8785 			s->first_displayed_line = s->lineno;
8786 	}
8787 	free(line);
8788 	if (nprinted > 0)
8789 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8790 	else
8791 		s->last_displayed_line = s->first_displayed_line;
8792 
8793 	view_border(view);
8794 
8795 	if (s->eof) {
8796 		rc = waddnstr(view->window,
8797 		    "See the tog(1) manual page for full documentation",
8798 		    view->ncols - 1);
8799 		if (rc == ERR)
8800 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8801 	} else {
8802 		wmove(view->window, view->nlines - 1, 0);
8803 		wclrtoeol(view->window);
8804 		wstandout(view->window);
8805 		rc = waddnstr(view->window, "scroll down for more...",
8806 		    view->ncols - 1);
8807 		if (rc == ERR)
8808 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8809 		if (getcurx(view->window) < view->ncols - 6) {
8810 			rc = wprintw(view->window, "[%.0f%%]",
8811 			    100.00 * s->last_displayed_line / s->nlines);
8812 			if (rc == ERR)
8813 				return got_error_msg(GOT_ERR_IO, "wprintw");
8814 		}
8815 		wstandend(view->window);
8816 	}
8817 
8818 	return NULL;
8819 }
8820 
8821 static const struct got_error *
8822 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8823 {
8824 	struct tog_help_view_state	*s = &view->state.help;
8825 	const struct got_error		*err = NULL;
8826 	char				*line = NULL;
8827 	ssize_t				 linelen;
8828 	size_t				 linesz = 0;
8829 	int				 eos, nscroll;
8830 
8831 	eos = nscroll = view->nlines;
8832 	if (view_is_hsplit_top(view))
8833 		--eos;  /* border */
8834 
8835 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8836 
8837 	switch (ch) {
8838 	case '0':
8839 		view->x = 0;
8840 		break;
8841 	case '$':
8842 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8843 		view->count = 0;
8844 		break;
8845 	case KEY_RIGHT:
8846 	case 'l':
8847 		if (view->x + view->ncols / 3 < view->maxx)
8848 			view->x += 2;
8849 		else
8850 			view->count = 0;
8851 		break;
8852 	case KEY_LEFT:
8853 	case 'h':
8854 		view->x -= MIN(view->x, 2);
8855 		if (view->x <= 0)
8856 			view->count = 0;
8857 		break;
8858 	case 'g':
8859 	case KEY_HOME:
8860 		s->first_displayed_line = 1;
8861 		view->count = 0;
8862 		break;
8863 	case 'G':
8864 	case KEY_END:
8865 		view->count = 0;
8866 		if (s->eof)
8867 			break;
8868 		s->first_displayed_line = (s->nlines - eos) + 3;
8869 		s->eof = 1;
8870 		break;
8871 	case 'k':
8872 	case KEY_UP:
8873 		if (s->first_displayed_line > 1)
8874 			--s->first_displayed_line;
8875 		else
8876 			view->count = 0;
8877 		break;
8878 	case CTRL('u'):
8879 	case 'u':
8880 		nscroll /= 2;
8881 		/* FALL THROUGH */
8882 	case KEY_PPAGE:
8883 	case CTRL('b'):
8884 	case 'b':
8885 		if (s->first_displayed_line == 1) {
8886 			view->count = 0;
8887 			break;
8888 		}
8889 		while (--nscroll > 0 && s->first_displayed_line > 1)
8890 			s->first_displayed_line--;
8891 		break;
8892 	case 'j':
8893 	case KEY_DOWN:
8894 	case CTRL('n'):
8895 		if (!s->eof)
8896 			++s->first_displayed_line;
8897 		else
8898 			view->count = 0;
8899 		break;
8900 	case CTRL('d'):
8901 	case 'd':
8902 		nscroll /= 2;
8903 		/* FALL THROUGH */
8904 	case KEY_NPAGE:
8905 	case CTRL('f'):
8906 	case 'f':
8907 	case ' ':
8908 		if (s->eof) {
8909 			view->count = 0;
8910 			break;
8911 		}
8912 		while (!s->eof && --nscroll > 0) {
8913 			linelen = getline(&line, &linesz, s->f);
8914 			s->first_displayed_line++;
8915 			if (linelen == -1) {
8916 				if (feof(s->f))
8917 					s->eof = 1;
8918 				else
8919 					err = got_ferror(s->f, GOT_ERR_IO);
8920 				break;
8921 			}
8922 		}
8923 		free(line);
8924 		break;
8925 	default:
8926 		view->count = 0;
8927 		break;
8928 	}
8929 
8930 	return err;
8931 }
8932 
8933 static const struct got_error *
8934 close_help_view(struct tog_view *view)
8935 {
8936 	struct tog_help_view_state *s = &view->state.help;
8937 
8938 	free(s->line_offsets);
8939 	s->line_offsets = NULL;
8940 	if (fclose(s->f) == EOF)
8941 		return got_error_from_errno("fclose");
8942 
8943 	return NULL;
8944 }
8945 
8946 static const struct got_error *
8947 reset_help_view(struct tog_view *view)
8948 {
8949 	struct tog_help_view_state *s = &view->state.help;
8950 
8951 
8952 	if (s->f && fclose(s->f) == EOF)
8953 		return got_error_from_errno("fclose");
8954 
8955 	wclear(view->window);
8956 	view->count = 0;
8957 	view->x = 0;
8958 	s->all = !s->all;
8959 	s->first_displayed_line = 1;
8960 	s->last_displayed_line = view->nlines;
8961 	s->matched_line = 0;
8962 
8963 	return create_help(s);
8964 }
8965 
8966 static const struct got_error *
8967 open_help_view(struct tog_view *view, struct tog_view *parent)
8968 {
8969 	const struct got_error		*err = NULL;
8970 	struct tog_help_view_state	*s = &view->state.help;
8971 
8972 	s->type = (enum tog_keymap_type)parent->type;
8973 	s->first_displayed_line = 1;
8974 	s->last_displayed_line = view->nlines;
8975 	s->selected_line = 1;
8976 
8977 	view->show = show_help_view;
8978 	view->input = input_help_view;
8979 	view->reset = reset_help_view;
8980 	view->close = close_help_view;
8981 	view->search_start = search_start_help_view;
8982 	view->search_setup = search_setup_help_view;
8983 	view->search_next = search_next_view_match;
8984 
8985 	err = create_help(s);
8986 	return err;
8987 }
8988 
8989 static const struct got_error *
8990 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8991     enum tog_view_type request, int y, int x)
8992 {
8993 	const struct got_error *err = NULL;
8994 
8995 	*new_view = NULL;
8996 
8997 	switch (request) {
8998 	case TOG_VIEW_DIFF:
8999 		if (view->type == TOG_VIEW_LOG) {
9000 			struct tog_log_view_state *s = &view->state.log;
9001 
9002 			err = open_diff_view_for_commit(new_view, y, x,
9003 			    s->selected_entry->commit, s->selected_entry->id,
9004 			    view, s->repo);
9005 		} else
9006 			return got_error_msg(GOT_ERR_NOT_IMPL,
9007 			    "parent/child view pair not supported");
9008 		break;
9009 	case TOG_VIEW_BLAME:
9010 		if (view->type == TOG_VIEW_TREE) {
9011 			struct tog_tree_view_state *s = &view->state.tree;
9012 
9013 			err = blame_tree_entry(new_view, y, x,
9014 			    s->selected_entry, &s->parents, s->commit_id,
9015 			    s->repo);
9016 		} else
9017 			return got_error_msg(GOT_ERR_NOT_IMPL,
9018 			    "parent/child view pair not supported");
9019 		break;
9020 	case TOG_VIEW_LOG:
9021 		if (view->type == TOG_VIEW_BLAME)
9022 			err = log_annotated_line(new_view, y, x,
9023 			    view->state.blame.repo, view->state.blame.id_to_log);
9024 		else if (view->type == TOG_VIEW_TREE)
9025 			err = log_selected_tree_entry(new_view, y, x,
9026 			    &view->state.tree);
9027 		else if (view->type == TOG_VIEW_REF)
9028 			err = log_ref_entry(new_view, y, x,
9029 			    view->state.ref.selected_entry,
9030 			    view->state.ref.repo);
9031 		else
9032 			return got_error_msg(GOT_ERR_NOT_IMPL,
9033 			    "parent/child view pair not supported");
9034 		break;
9035 	case TOG_VIEW_TREE:
9036 		if (view->type == TOG_VIEW_LOG)
9037 			err = browse_commit_tree(new_view, y, x,
9038 			    view->state.log.selected_entry,
9039 			    view->state.log.in_repo_path,
9040 			    view->state.log.head_ref_name,
9041 			    view->state.log.repo);
9042 		else if (view->type == TOG_VIEW_REF)
9043 			err = browse_ref_tree(new_view, y, x,
9044 			    view->state.ref.selected_entry,
9045 			    view->state.ref.repo);
9046 		else
9047 			return got_error_msg(GOT_ERR_NOT_IMPL,
9048 			    "parent/child view pair not supported");
9049 		break;
9050 	case TOG_VIEW_REF:
9051 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9052 		if (*new_view == NULL)
9053 			return got_error_from_errno("view_open");
9054 		if (view->type == TOG_VIEW_LOG)
9055 			err = open_ref_view(*new_view, view->state.log.repo);
9056 		else if (view->type == TOG_VIEW_TREE)
9057 			err = open_ref_view(*new_view, view->state.tree.repo);
9058 		else
9059 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9060 			    "parent/child view pair not supported");
9061 		if (err)
9062 			view_close(*new_view);
9063 		break;
9064 	case TOG_VIEW_HELP:
9065 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9066 		if (*new_view == NULL)
9067 			return got_error_from_errno("view_open");
9068 		err = open_help_view(*new_view, view);
9069 		if (err)
9070 			view_close(*new_view);
9071 		break;
9072 	default:
9073 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9074 	}
9075 
9076 	return err;
9077 }
9078 
9079 /*
9080  * If view was scrolled down to move the selected line into view when opening a
9081  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9082  */
9083 static void
9084 offset_selection_up(struct tog_view *view)
9085 {
9086 	switch (view->type) {
9087 	case TOG_VIEW_BLAME: {
9088 		struct tog_blame_view_state *s = &view->state.blame;
9089 		if (s->first_displayed_line == 1) {
9090 			s->selected_line = MAX(s->selected_line - view->offset,
9091 			    1);
9092 			break;
9093 		}
9094 		if (s->first_displayed_line > view->offset)
9095 			s->first_displayed_line -= view->offset;
9096 		else
9097 			s->first_displayed_line = 1;
9098 		s->selected_line += view->offset;
9099 		break;
9100 	}
9101 	case TOG_VIEW_LOG:
9102 		log_scroll_up(&view->state.log, view->offset);
9103 		view->state.log.selected += view->offset;
9104 		break;
9105 	case TOG_VIEW_REF:
9106 		ref_scroll_up(&view->state.ref, view->offset);
9107 		view->state.ref.selected += view->offset;
9108 		break;
9109 	case TOG_VIEW_TREE:
9110 		tree_scroll_up(&view->state.tree, view->offset);
9111 		view->state.tree.selected += view->offset;
9112 		break;
9113 	default:
9114 		break;
9115 	}
9116 
9117 	view->offset = 0;
9118 }
9119 
9120 /*
9121  * If the selected line is in the section of screen covered by the bottom split,
9122  * scroll down offset lines to move it into view and index its new position.
9123  */
9124 static const struct got_error *
9125 offset_selection_down(struct tog_view *view)
9126 {
9127 	const struct got_error	*err = NULL;
9128 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9129 	int			*selected = NULL;
9130 	int			 header, offset;
9131 
9132 	switch (view->type) {
9133 	case TOG_VIEW_BLAME: {
9134 		struct tog_blame_view_state *s = &view->state.blame;
9135 		header = 3;
9136 		scrolld = NULL;
9137 		if (s->selected_line > view->nlines - header) {
9138 			offset = abs(view->nlines - s->selected_line - header);
9139 			s->first_displayed_line += offset;
9140 			s->selected_line -= offset;
9141 			view->offset = offset;
9142 		}
9143 		break;
9144 	}
9145 	case TOG_VIEW_LOG: {
9146 		struct tog_log_view_state *s = &view->state.log;
9147 		scrolld = &log_scroll_down;
9148 		header = view_is_parent_view(view) ? 3 : 2;
9149 		selected = &s->selected;
9150 		break;
9151 	}
9152 	case TOG_VIEW_REF: {
9153 		struct tog_ref_view_state *s = &view->state.ref;
9154 		scrolld = &ref_scroll_down;
9155 		header = 3;
9156 		selected = &s->selected;
9157 		break;
9158 	}
9159 	case TOG_VIEW_TREE: {
9160 		struct tog_tree_view_state *s = &view->state.tree;
9161 		scrolld = &tree_scroll_down;
9162 		header = 5;
9163 		selected = &s->selected;
9164 		break;
9165 	}
9166 	default:
9167 		selected = NULL;
9168 		scrolld = NULL;
9169 		header = 0;
9170 		break;
9171 	}
9172 
9173 	if (selected && *selected > view->nlines - header) {
9174 		offset = abs(view->nlines - *selected - header);
9175 		view->offset = offset;
9176 		if (scrolld && offset) {
9177 			err = scrolld(view, offset);
9178 			*selected -= offset;
9179 		}
9180 	}
9181 
9182 	return err;
9183 }
9184 
9185 static void
9186 list_commands(FILE *fp)
9187 {
9188 	size_t i;
9189 
9190 	fprintf(fp, "commands:");
9191 	for (i = 0; i < nitems(tog_commands); i++) {
9192 		const struct tog_cmd *cmd = &tog_commands[i];
9193 		fprintf(fp, " %s", cmd->name);
9194 	}
9195 	fputc('\n', fp);
9196 }
9197 
9198 __dead static void
9199 usage(int hflag, int status)
9200 {
9201 	FILE *fp = (status == 0) ? stdout : stderr;
9202 
9203 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9204 	    getprogname());
9205 	if (hflag) {
9206 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9207 		list_commands(fp);
9208 	}
9209 	exit(status);
9210 }
9211 
9212 static char **
9213 make_argv(int argc, ...)
9214 {
9215 	va_list ap;
9216 	char **argv;
9217 	int i;
9218 
9219 	va_start(ap, argc);
9220 
9221 	argv = calloc(argc, sizeof(char *));
9222 	if (argv == NULL)
9223 		err(1, "calloc");
9224 	for (i = 0; i < argc; i++) {
9225 		argv[i] = strdup(va_arg(ap, char *));
9226 		if (argv[i] == NULL)
9227 			err(1, "strdup");
9228 	}
9229 
9230 	va_end(ap);
9231 	return argv;
9232 }
9233 
9234 /*
9235  * Try to convert 'tog path' into a 'tog log path' command.
9236  * The user could simply have mistyped the command rather than knowingly
9237  * provided a path. So check whether argv[0] can in fact be resolved
9238  * to a path in the HEAD commit and print a special error if not.
9239  * This hack is for mpi@ <3
9240  */
9241 static const struct got_error *
9242 tog_log_with_path(int argc, char *argv[])
9243 {
9244 	const struct got_error *error = NULL, *close_err;
9245 	const struct tog_cmd *cmd = NULL;
9246 	struct got_repository *repo = NULL;
9247 	struct got_worktree *worktree = NULL;
9248 	struct got_object_id *commit_id = NULL, *id = NULL;
9249 	struct got_commit_object *commit = NULL;
9250 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9251 	char *commit_id_str = NULL, **cmd_argv = NULL;
9252 	int *pack_fds = NULL;
9253 
9254 	cwd = getcwd(NULL, 0);
9255 	if (cwd == NULL)
9256 		return got_error_from_errno("getcwd");
9257 
9258 	error = got_repo_pack_fds_open(&pack_fds);
9259 	if (error != NULL)
9260 		goto done;
9261 
9262 	error = got_worktree_open(&worktree, cwd);
9263 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9264 		goto done;
9265 
9266 	if (worktree)
9267 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9268 	else
9269 		repo_path = strdup(cwd);
9270 	if (repo_path == NULL) {
9271 		error = got_error_from_errno("strdup");
9272 		goto done;
9273 	}
9274 
9275 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9276 	if (error != NULL)
9277 		goto done;
9278 
9279 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9280 	    repo, worktree);
9281 	if (error)
9282 		goto done;
9283 
9284 	error = tog_load_refs(repo, 0);
9285 	if (error)
9286 		goto done;
9287 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9288 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9289 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9290 	if (error)
9291 		goto done;
9292 
9293 	if (worktree) {
9294 		got_worktree_close(worktree);
9295 		worktree = NULL;
9296 	}
9297 
9298 	error = got_object_open_as_commit(&commit, repo, commit_id);
9299 	if (error)
9300 		goto done;
9301 
9302 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9303 	if (error) {
9304 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9305 			goto done;
9306 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9307 		    getprogname(), argv[0]);
9308 		usage(1, 1);
9309 		/* not reached */
9310 	}
9311 
9312 	error = got_object_id_str(&commit_id_str, commit_id);
9313 	if (error)
9314 		goto done;
9315 
9316 	cmd = &tog_commands[0]; /* log */
9317 	argc = 4;
9318 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9319 	error = cmd->cmd_main(argc, cmd_argv);
9320 done:
9321 	if (repo) {
9322 		close_err = got_repo_close(repo);
9323 		if (error == NULL)
9324 			error = close_err;
9325 	}
9326 	if (commit)
9327 		got_object_commit_close(commit);
9328 	if (worktree)
9329 		got_worktree_close(worktree);
9330 	if (pack_fds) {
9331 		const struct got_error *pack_err =
9332 		    got_repo_pack_fds_close(pack_fds);
9333 		if (error == NULL)
9334 			error = pack_err;
9335 	}
9336 	free(id);
9337 	free(commit_id_str);
9338 	free(commit_id);
9339 	free(cwd);
9340 	free(repo_path);
9341 	free(in_repo_path);
9342 	if (cmd_argv) {
9343 		int i;
9344 		for (i = 0; i < argc; i++)
9345 			free(cmd_argv[i]);
9346 		free(cmd_argv);
9347 	}
9348 	tog_free_refs();
9349 	return error;
9350 }
9351 
9352 int
9353 main(int argc, char *argv[])
9354 {
9355 	const struct got_error *error = NULL;
9356 	const struct tog_cmd *cmd = NULL;
9357 	int ch, hflag = 0, Vflag = 0;
9358 	char **cmd_argv = NULL;
9359 	static const struct option longopts[] = {
9360 	    { "version", no_argument, NULL, 'V' },
9361 	    { NULL, 0, NULL, 0}
9362 	};
9363 	char *diff_algo_str = NULL;
9364 
9365 	if (!isatty(STDIN_FILENO))
9366 		errx(1, "standard input is not a tty");
9367 
9368 	setlocale(LC_CTYPE, "");
9369 
9370 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9371 		switch (ch) {
9372 		case 'h':
9373 			hflag = 1;
9374 			break;
9375 		case 'V':
9376 			Vflag = 1;
9377 			break;
9378 		default:
9379 			usage(hflag, 1);
9380 			/* NOTREACHED */
9381 		}
9382 	}
9383 
9384 	argc -= optind;
9385 	argv += optind;
9386 	optind = 1;
9387 	optreset = 1;
9388 
9389 	if (Vflag) {
9390 		got_version_print_str();
9391 		return 0;
9392 	}
9393 
9394 #ifndef PROFILE
9395 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9396 	    NULL) == -1)
9397 		err(1, "pledge");
9398 #endif
9399 
9400 	if (argc == 0) {
9401 		if (hflag)
9402 			usage(hflag, 0);
9403 		/* Build an argument vector which runs a default command. */
9404 		cmd = &tog_commands[0];
9405 		argc = 1;
9406 		cmd_argv = make_argv(argc, cmd->name);
9407 	} else {
9408 		size_t i;
9409 
9410 		/* Did the user specify a command? */
9411 		for (i = 0; i < nitems(tog_commands); i++) {
9412 			if (strncmp(tog_commands[i].name, argv[0],
9413 			    strlen(argv[0])) == 0) {
9414 				cmd = &tog_commands[i];
9415 				break;
9416 			}
9417 		}
9418 	}
9419 
9420 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9421 	if (diff_algo_str) {
9422 		if (strcasecmp(diff_algo_str, "patience") == 0)
9423 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9424 		if (strcasecmp(diff_algo_str, "myers") == 0)
9425 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9426 	}
9427 
9428 	if (cmd == NULL) {
9429 		if (argc != 1)
9430 			usage(0, 1);
9431 		/* No command specified; try log with a path */
9432 		error = tog_log_with_path(argc, argv);
9433 	} else {
9434 		if (hflag)
9435 			cmd->cmd_usage();
9436 		else
9437 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9438 	}
9439 
9440 	endwin();
9441 	putchar('\n');
9442 	if (cmd_argv) {
9443 		int i;
9444 		for (i = 0; i < argc; i++)
9445 			free(cmd_argv[i]);
9446 		free(cmd_argv);
9447 	}
9448 
9449 	if (error && error->code != GOT_ERR_CANCELLED &&
9450 	    error->code != GOT_ERR_EOF &&
9451 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9452 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9453 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9454 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9455 	return 0;
9456 }