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 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 	TOG_VIEW_HELP
112 };
113 
114 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
115 enum tog_keymap_type {
116 	TOG_KEYMAP_KEYS = -2,
117 	TOG_KEYMAP_GLOBAL,
118 	TOG_KEYMAP_DIFF,
119 	TOG_KEYMAP_LOG,
120 	TOG_KEYMAP_BLAME,
121 	TOG_KEYMAP_TREE,
122 	TOG_KEYMAP_REF,
123 	TOG_KEYMAP_HELP
124 };
125 
126 enum tog_view_mode {
127 	TOG_VIEW_SPLIT_NONE,
128 	TOG_VIEW_SPLIT_VERT,
129 	TOG_VIEW_SPLIT_HRZN
130 };
131 
132 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
133 
134 #define TOG_EOF_STRING	"(END)"
135 
136 struct commit_queue_entry {
137 	TAILQ_ENTRY(commit_queue_entry) entry;
138 	struct got_object_id *id;
139 	struct got_commit_object *commit;
140 	int idx;
141 };
142 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
143 struct commit_queue {
144 	int ncommits;
145 	struct commit_queue_head head;
146 };
147 
148 struct tog_color {
149 	STAILQ_ENTRY(tog_color) entry;
150 	regex_t regex;
151 	short colorpair;
152 };
153 STAILQ_HEAD(tog_colors, tog_color);
154 
155 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
156 static struct got_reflist_object_id_map *tog_refs_idmap;
157 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
158 
159 static const struct got_error *
160 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
161     struct got_reference* re2)
162 {
163 	const char *name1 = got_ref_get_name(re1);
164 	const char *name2 = got_ref_get_name(re2);
165 	int isbackup1, isbackup2;
166 
167 	/* Sort backup refs towards the bottom of the list. */
168 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
169 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
170 	if (!isbackup1 && isbackup2) {
171 		*cmp = -1;
172 		return NULL;
173 	} else if (isbackup1 && !isbackup2) {
174 		*cmp = 1;
175 		return NULL;
176 	}
177 
178 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
179 	return NULL;
180 }
181 
182 static const struct got_error *
183 tog_load_refs(struct got_repository *repo, int sort_by_date)
184 {
185 	const struct got_error *err;
186 
187 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
188 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
189 	    repo);
190 	if (err)
191 		return err;
192 
193 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
194 	    repo);
195 }
196 
197 static void
198 tog_free_refs(void)
199 {
200 	if (tog_refs_idmap) {
201 		got_reflist_object_id_map_free(tog_refs_idmap);
202 		tog_refs_idmap = NULL;
203 	}
204 	got_ref_list_free(&tog_refs);
205 }
206 
207 static const struct got_error *
208 add_color(struct tog_colors *colors, const char *pattern,
209     int idx, short color)
210 {
211 	const struct got_error *err = NULL;
212 	struct tog_color *tc;
213 	int regerr = 0;
214 
215 	if (idx < 1 || idx > COLOR_PAIRS - 1)
216 		return NULL;
217 
218 	init_pair(idx, color, -1);
219 
220 	tc = calloc(1, sizeof(*tc));
221 	if (tc == NULL)
222 		return got_error_from_errno("calloc");
223 	regerr = regcomp(&tc->regex, pattern,
224 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
225 	if (regerr) {
226 		static char regerr_msg[512];
227 		static char err_msg[512];
228 		regerror(regerr, &tc->regex, regerr_msg,
229 		    sizeof(regerr_msg));
230 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
231 		    regerr_msg);
232 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
233 		free(tc);
234 		return err;
235 	}
236 	tc->colorpair = idx;
237 	STAILQ_INSERT_HEAD(colors, tc, entry);
238 	return NULL;
239 }
240 
241 static void
242 free_colors(struct tog_colors *colors)
243 {
244 	struct tog_color *tc;
245 
246 	while (!STAILQ_EMPTY(colors)) {
247 		tc = STAILQ_FIRST(colors);
248 		STAILQ_REMOVE_HEAD(colors, entry);
249 		regfree(&tc->regex);
250 		free(tc);
251 	}
252 }
253 
254 static struct tog_color *
255 get_color(struct tog_colors *colors, int colorpair)
256 {
257 	struct tog_color *tc = NULL;
258 
259 	STAILQ_FOREACH(tc, colors, entry) {
260 		if (tc->colorpair == colorpair)
261 			return tc;
262 	}
263 
264 	return NULL;
265 }
266 
267 static int
268 default_color_value(const char *envvar)
269 {
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
271 		return COLOR_MAGENTA;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
273 		return COLOR_CYAN;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
275 		return COLOR_YELLOW;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
277 		return COLOR_GREEN;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
279 		return COLOR_MAGENTA;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
283 		return COLOR_CYAN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
285 		return COLOR_GREEN;
286 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
291 		return COLOR_YELLOW;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
295 		return COLOR_MAGENTA;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
299 		return COLOR_CYAN;
300 
301 	return -1;
302 }
303 
304 static int
305 get_color_value(const char *envvar)
306 {
307 	const char *val = getenv(envvar);
308 
309 	if (val == NULL)
310 		return default_color_value(envvar);
311 
312 	if (strcasecmp(val, "black") == 0)
313 		return COLOR_BLACK;
314 	if (strcasecmp(val, "red") == 0)
315 		return COLOR_RED;
316 	if (strcasecmp(val, "green") == 0)
317 		return COLOR_GREEN;
318 	if (strcasecmp(val, "yellow") == 0)
319 		return COLOR_YELLOW;
320 	if (strcasecmp(val, "blue") == 0)
321 		return COLOR_BLUE;
322 	if (strcasecmp(val, "magenta") == 0)
323 		return COLOR_MAGENTA;
324 	if (strcasecmp(val, "cyan") == 0)
325 		return COLOR_CYAN;
326 	if (strcasecmp(val, "white") == 0)
327 		return COLOR_WHITE;
328 	if (strcasecmp(val, "default") == 0)
329 		return -1;
330 
331 	return default_color_value(envvar);
332 }
333 
334 struct tog_diff_view_state {
335 	struct got_object_id *id1, *id2;
336 	const char *label1, *label2;
337 	FILE *f, *f1, *f2;
338 	int fd1, fd2;
339 	int lineno;
340 	int first_displayed_line;
341 	int last_displayed_line;
342 	int eof;
343 	int diff_context;
344 	int ignore_whitespace;
345 	int force_text_diff;
346 	struct got_repository *repo;
347 	struct got_diff_line *lines;
348 	size_t nlines;
349 	int matched_line;
350 	int selected_line;
351 
352 	/* passed from log or blame view; may be NULL */
353 	struct tog_view *parent_view;
354 };
355 
356 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
357 static volatile sig_atomic_t tog_thread_error;
358 
359 struct tog_log_thread_args {
360 	pthread_cond_t need_commits;
361 	pthread_cond_t commit_loaded;
362 	int commits_needed;
363 	int load_all;
364 	struct got_commit_graph *graph;
365 	struct commit_queue *real_commits;
366 	const char *in_repo_path;
367 	struct got_object_id *start_id;
368 	struct got_repository *repo;
369 	int *pack_fds;
370 	int log_complete;
371 	sig_atomic_t *quit;
372 	struct commit_queue_entry **first_displayed_entry;
373 	struct commit_queue_entry **selected_entry;
374 	int *searching;
375 	int *search_next_done;
376 	regex_t *regex;
377 	int *limiting;
378 	int limit_match;
379 	regex_t *limit_regex;
380 	struct commit_queue *limit_commits;
381 };
382 
383 struct tog_log_view_state {
384 	struct commit_queue *commits;
385 	struct commit_queue_entry *first_displayed_entry;
386 	struct commit_queue_entry *last_displayed_entry;
387 	struct commit_queue_entry *selected_entry;
388 	struct commit_queue real_commits;
389 	int selected;
390 	char *in_repo_path;
391 	char *head_ref_name;
392 	int log_branches;
393 	struct got_repository *repo;
394 	struct got_object_id *start_id;
395 	sig_atomic_t quit;
396 	pthread_t thread;
397 	struct tog_log_thread_args thread_args;
398 	struct commit_queue_entry *matched_entry;
399 	struct commit_queue_entry *search_entry;
400 	struct tog_colors colors;
401 	int use_committer;
402 	int limit_view;
403 	regex_t limit_regex;
404 	struct commit_queue limit_commits;
405 };
406 
407 #define TOG_COLOR_DIFF_MINUS		1
408 #define TOG_COLOR_DIFF_PLUS		2
409 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
410 #define TOG_COLOR_DIFF_META		4
411 #define TOG_COLOR_TREE_SUBMODULE	5
412 #define TOG_COLOR_TREE_SYMLINK		6
413 #define TOG_COLOR_TREE_DIRECTORY	7
414 #define TOG_COLOR_TREE_EXECUTABLE	8
415 #define TOG_COLOR_COMMIT		9
416 #define TOG_COLOR_AUTHOR		10
417 #define TOG_COLOR_DATE			11
418 #define TOG_COLOR_REFS_HEADS		12
419 #define TOG_COLOR_REFS_TAGS		13
420 #define TOG_COLOR_REFS_REMOTES		14
421 #define TOG_COLOR_REFS_BACKUP		15
422 
423 struct tog_blame_cb_args {
424 	struct tog_blame_line *lines; /* one per line */
425 	int nlines;
426 
427 	struct tog_view *view;
428 	struct got_object_id *commit_id;
429 	int *quit;
430 };
431 
432 struct tog_blame_thread_args {
433 	const char *path;
434 	struct got_repository *repo;
435 	struct tog_blame_cb_args *cb_args;
436 	int *complete;
437 	got_cancel_cb cancel_cb;
438 	void *cancel_arg;
439 };
440 
441 struct tog_blame {
442 	FILE *f;
443 	off_t filesize;
444 	struct tog_blame_line *lines;
445 	int nlines;
446 	off_t *line_offsets;
447 	pthread_t thread;
448 	struct tog_blame_thread_args thread_args;
449 	struct tog_blame_cb_args cb_args;
450 	const char *path;
451 	int *pack_fds;
452 };
453 
454 struct tog_blame_view_state {
455 	int first_displayed_line;
456 	int last_displayed_line;
457 	int selected_line;
458 	int last_diffed_line;
459 	int blame_complete;
460 	int eof;
461 	int done;
462 	struct got_object_id_queue blamed_commits;
463 	struct got_object_qid *blamed_commit;
464 	char *path;
465 	struct got_repository *repo;
466 	struct got_object_id *commit_id;
467 	struct got_object_id *id_to_log;
468 	struct tog_blame blame;
469 	int matched_line;
470 	struct tog_colors colors;
471 };
472 
473 struct tog_parent_tree {
474 	TAILQ_ENTRY(tog_parent_tree) entry;
475 	struct got_tree_object *tree;
476 	struct got_tree_entry *first_displayed_entry;
477 	struct got_tree_entry *selected_entry;
478 	int selected;
479 };
480 
481 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
482 
483 struct tog_tree_view_state {
484 	char *tree_label;
485 	struct got_object_id *commit_id;/* commit which this tree belongs to */
486 	struct got_tree_object *root;	/* the commit's root tree entry */
487 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
488 	struct got_tree_entry *first_displayed_entry;
489 	struct got_tree_entry *last_displayed_entry;
490 	struct got_tree_entry *selected_entry;
491 	int ndisplayed, selected, show_ids;
492 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
493 	char *head_ref_name;
494 	struct got_repository *repo;
495 	struct got_tree_entry *matched_entry;
496 	struct tog_colors colors;
497 };
498 
499 struct tog_reflist_entry {
500 	TAILQ_ENTRY(tog_reflist_entry) entry;
501 	struct got_reference *ref;
502 	int idx;
503 };
504 
505 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
506 
507 struct tog_ref_view_state {
508 	struct tog_reflist_head refs;
509 	struct tog_reflist_entry *first_displayed_entry;
510 	struct tog_reflist_entry *last_displayed_entry;
511 	struct tog_reflist_entry *selected_entry;
512 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
513 	struct got_repository *repo;
514 	struct tog_reflist_entry *matched_entry;
515 	struct tog_colors colors;
516 };
517 
518 struct tog_help_view_state {
519 	FILE			*f;
520 	off_t			*line_offsets;
521 	size_t			 nlines;
522 	int			 lineno;
523 	int			 first_displayed_line;
524 	int			 last_displayed_line;
525 	int			 eof;
526 	int			 matched_line;
527 	int			 selected_line;
528 	int			 all;
529 	enum tog_keymap_type	 type;
530 };
531 
532 #define GENERATE_HELP \
533 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
534 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
535 	KEY_("k C-p Up", "Move cursor or page up one line"), \
536 	KEY_("j C-n Down", "Move cursor or page down one line"), \
537 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
538 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
539 	KEY_("C-u u", "Scroll the view up one half page"), \
540 	KEY_("C-d d", "Scroll the view down one half page"), \
541 	KEY_("g Home", "Go to line N (default: first line)"), \
542 	KEY_("G End", "Go to line N (default: last line)"), \
543 	KEY_("l Right", "Scroll the view right"), \
544 	KEY_("h Left", "Scroll the view left"), \
545 	KEY_("$", "Scroll view to the rightmost position"), \
546 	KEY_("0", "Scroll view to the leftmost position"), \
547 	KEY_("-", "Decrease size of the focussed split"), \
548 	KEY_("+", "Increase size of the focussed split"), \
549 	KEY_("Tab", "Switch focus between views"), \
550 	KEY_("F", "Toggle fullscreen mode"), \
551 	KEY_("/", "Open prompt to enter search term"), \
552 	KEY_("n", "Find next line/token matching the current search term"), \
553 	KEY_("N", "Find previous line/token matching the current search term"),\
554 	KEY_("q", "Quit the focussed view; Quit help screen"), \
555 	KEY_("Q", "Quit tog"), \
556 	\
557 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
558 	KEY_("< ,", "Move cursor up one commit"), \
559 	KEY_("> .", "Move cursor down one commit"), \
560 	KEY_("Enter", "Open diff view of the selected commit"), \
561 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
562 	KEY_("R", "Open ref view of all repository references"), \
563 	KEY_("T", "Display tree view of the repository from the selected" \
564 	    " commit"), \
565 	KEY_("@", "Toggle between displaying author and committer name"), \
566 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
567 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
568 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
569 	\
570 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
571 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
572 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
573 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
574 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
575 	    " data"), \
576 	KEY_("(", "Go to the previous file in the diff"), \
577 	KEY_(")", "Go to the next file in the diff"), \
578 	KEY_("{", "Go to the previous hunk in the diff"), \
579 	KEY_("}", "Go to the next hunk in the diff"), \
580 	KEY_("[", "Decrease the number of context lines"), \
581 	KEY_("]", "Increase the number of context lines"), \
582 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
583 	\
584 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
585 	KEY_("Enter", "Display diff view of the selected line's commit"), \
586 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
587 	KEY_("L", "Open log view for the currently selected annotated line"), \
588 	KEY_("C", "Reload view with the previously blamed commit"), \
589 	KEY_("c", "Reload view with the version of the file found in the" \
590 	    " selected line's commit"), \
591 	KEY_("p", "Reload view with the version of the file found in the" \
592 	    " selected line's parent commit"), \
593 	\
594 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
595 	KEY_("Enter", "Enter selected directory or open blame view of the" \
596 	    " selected file"), \
597 	KEY_("L", "Open log view for the selected entry"), \
598 	KEY_("R", "Open ref view of all repository references"), \
599 	KEY_("i", "Show object IDs for all tree entries"), \
600 	KEY_("Backspace", "Return to the parent directory"), \
601 	\
602 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
603 	KEY_("Enter", "Display log view of the selected reference"), \
604 	KEY_("T", "Display tree view of the selected reference"), \
605 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
606 	KEY_("m", "Toggle display of last modified date for each reference"), \
607 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
608 	KEY_("C-l", "Reload view with all repository references")
609 
610 struct tog_key_map {
611 	const char		*keys;
612 	const char		*info;
613 	enum tog_keymap_type	 type;
614 };
615 
616 /*
617  * We implement two types of views: parent views and child views.
618  *
619  * The 'Tab' key switches focus between a parent view and its child view.
620  * Child views are shown side-by-side to their parent view, provided
621  * there is enough screen estate.
622  *
623  * When a new view is opened from within a parent view, this new view
624  * becomes a child view of the parent view, replacing any existing child.
625  *
626  * When a new view is opened from within a child view, this new view
627  * becomes a parent view which will obscure the views below until the
628  * user quits the new parent view by typing 'q'.
629  *
630  * This list of views contains parent views only.
631  * Child views are only pointed to by their parent view.
632  */
633 TAILQ_HEAD(tog_view_list_head, tog_view);
634 
635 struct tog_view {
636 	TAILQ_ENTRY(tog_view) entry;
637 	WINDOW *window;
638 	PANEL *panel;
639 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
640 	int resized_y, resized_x; /* begin_y/x based on user resizing */
641 	int maxx, x; /* max column and current start column */
642 	int lines, cols; /* copies of LINES and COLS */
643 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
644 	int gline, hiline; /* navigate to and highlight this nG line */
645 	int ch, count; /* current keymap and count prefix */
646 	int resized; /* set when in a resize event */
647 	int focussed; /* Only set on one parent or child view at a time. */
648 	int dying;
649 	struct tog_view *parent;
650 	struct tog_view *child;
651 
652 	/*
653 	 * This flag is initially set on parent views when a new child view
654 	 * is created. It gets toggled when the 'Tab' key switches focus
655 	 * between parent and child.
656 	 * The flag indicates whether focus should be passed on to our child
657 	 * view if this parent view gets picked for focus after another parent
658 	 * view was closed. This prevents child views from losing focus in such
659 	 * situations.
660 	 */
661 	int focus_child;
662 
663 	enum tog_view_mode mode;
664 	/* type-specific state */
665 	enum tog_view_type type;
666 	union {
667 		struct tog_diff_view_state diff;
668 		struct tog_log_view_state log;
669 		struct tog_blame_view_state blame;
670 		struct tog_tree_view_state tree;
671 		struct tog_ref_view_state ref;
672 		struct tog_help_view_state help;
673 	} state;
674 
675 	const struct got_error *(*show)(struct tog_view *);
676 	const struct got_error *(*input)(struct tog_view **,
677 	    struct tog_view *, int);
678 	const struct got_error *(*reset)(struct tog_view *);
679 	const struct got_error *(*resize)(struct tog_view *, int);
680 	const struct got_error *(*close)(struct tog_view *);
681 
682 	const struct got_error *(*search_start)(struct tog_view *);
683 	const struct got_error *(*search_next)(struct tog_view *);
684 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
685 	    int **, int **, int **, int **);
686 	int search_started;
687 	int searching;
688 #define TOG_SEARCH_FORWARD	1
689 #define TOG_SEARCH_BACKWARD	2
690 	int search_next_done;
691 #define TOG_SEARCH_HAVE_MORE	1
692 #define TOG_SEARCH_NO_MORE	2
693 #define TOG_SEARCH_HAVE_NONE	3
694 	regex_t regex;
695 	regmatch_t regmatch;
696 };
697 
698 static const struct got_error *open_diff_view(struct tog_view *,
699     struct got_object_id *, struct got_object_id *,
700     const char *, const char *, int, int, int, struct tog_view *,
701     struct got_repository *);
702 static const struct got_error *show_diff_view(struct tog_view *);
703 static const struct got_error *input_diff_view(struct tog_view **,
704     struct tog_view *, int);
705 static const struct got_error *reset_diff_view(struct tog_view *);
706 static const struct got_error* close_diff_view(struct tog_view *);
707 static const struct got_error *search_start_diff_view(struct tog_view *);
708 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
709     size_t *, int **, int **, int **, int **);
710 static const struct got_error *search_next_view_match(struct tog_view *);
711 
712 static const struct got_error *open_log_view(struct tog_view *,
713     struct got_object_id *, struct got_repository *,
714     const char *, const char *, int);
715 static const struct got_error * show_log_view(struct tog_view *);
716 static const struct got_error *input_log_view(struct tog_view **,
717     struct tog_view *, int);
718 static const struct got_error *resize_log_view(struct tog_view *, int);
719 static const struct got_error *close_log_view(struct tog_view *);
720 static const struct got_error *search_start_log_view(struct tog_view *);
721 static const struct got_error *search_next_log_view(struct tog_view *);
722 
723 static const struct got_error *open_blame_view(struct tog_view *, char *,
724     struct got_object_id *, struct got_repository *);
725 static const struct got_error *show_blame_view(struct tog_view *);
726 static const struct got_error *input_blame_view(struct tog_view **,
727     struct tog_view *, int);
728 static const struct got_error *reset_blame_view(struct tog_view *);
729 static const struct got_error *close_blame_view(struct tog_view *);
730 static const struct got_error *search_start_blame_view(struct tog_view *);
731 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
732     size_t *, int **, int **, int **, int **);
733 
734 static const struct got_error *open_tree_view(struct tog_view *,
735     struct got_object_id *, const char *, struct got_repository *);
736 static const struct got_error *show_tree_view(struct tog_view *);
737 static const struct got_error *input_tree_view(struct tog_view **,
738     struct tog_view *, int);
739 static const struct got_error *close_tree_view(struct tog_view *);
740 static const struct got_error *search_start_tree_view(struct tog_view *);
741 static const struct got_error *search_next_tree_view(struct tog_view *);
742 
743 static const struct got_error *open_ref_view(struct tog_view *,
744     struct got_repository *);
745 static const struct got_error *show_ref_view(struct tog_view *);
746 static const struct got_error *input_ref_view(struct tog_view **,
747     struct tog_view *, int);
748 static const struct got_error *close_ref_view(struct tog_view *);
749 static const struct got_error *search_start_ref_view(struct tog_view *);
750 static const struct got_error *search_next_ref_view(struct tog_view *);
751 
752 static const struct got_error *open_help_view(struct tog_view *,
753     struct tog_view *);
754 static const struct got_error *show_help_view(struct tog_view *);
755 static const struct got_error *input_help_view(struct tog_view **,
756     struct tog_view *, int);
757 static const struct got_error *reset_help_view(struct tog_view *);
758 static const struct got_error* close_help_view(struct tog_view *);
759 static const struct got_error *search_start_help_view(struct tog_view *);
760 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
761     size_t *, int **, int **, int **, int **);
762 
763 static volatile sig_atomic_t tog_sigwinch_received;
764 static volatile sig_atomic_t tog_sigpipe_received;
765 static volatile sig_atomic_t tog_sigcont_received;
766 static volatile sig_atomic_t tog_sigint_received;
767 static volatile sig_atomic_t tog_sigterm_received;
768 
769 static void
770 tog_sigwinch(int signo)
771 {
772 	tog_sigwinch_received = 1;
773 }
774 
775 static void
776 tog_sigpipe(int signo)
777 {
778 	tog_sigpipe_received = 1;
779 }
780 
781 static void
782 tog_sigcont(int signo)
783 {
784 	tog_sigcont_received = 1;
785 }
786 
787 static void
788 tog_sigint(int signo)
789 {
790 	tog_sigint_received = 1;
791 }
792 
793 static void
794 tog_sigterm(int signo)
795 {
796 	tog_sigterm_received = 1;
797 }
798 
799 static int
800 tog_fatal_signal_received(void)
801 {
802 	return (tog_sigpipe_received ||
803 	    tog_sigint_received || tog_sigterm_received);
804 }
805 
806 static const struct got_error *
807 view_close(struct tog_view *view)
808 {
809 	const struct got_error *err = NULL, *child_err = NULL;
810 
811 	if (view->child) {
812 		child_err = view_close(view->child);
813 		view->child = NULL;
814 	}
815 	if (view->close)
816 		err = view->close(view);
817 	if (view->panel)
818 		del_panel(view->panel);
819 	if (view->window)
820 		delwin(view->window);
821 	free(view);
822 	return err ? err : child_err;
823 }
824 
825 static struct tog_view *
826 view_open(int nlines, int ncols, int begin_y, int begin_x,
827     enum tog_view_type type)
828 {
829 	struct tog_view *view = calloc(1, sizeof(*view));
830 
831 	if (view == NULL)
832 		return NULL;
833 
834 	view->type = type;
835 	view->lines = LINES;
836 	view->cols = COLS;
837 	view->nlines = nlines ? nlines : LINES - begin_y;
838 	view->ncols = ncols ? ncols : COLS - begin_x;
839 	view->begin_y = begin_y;
840 	view->begin_x = begin_x;
841 	view->window = newwin(nlines, ncols, begin_y, begin_x);
842 	if (view->window == NULL) {
843 		view_close(view);
844 		return NULL;
845 	}
846 	view->panel = new_panel(view->window);
847 	if (view->panel == NULL ||
848 	    set_panel_userptr(view->panel, view) != OK) {
849 		view_close(view);
850 		return NULL;
851 	}
852 
853 	keypad(view->window, TRUE);
854 	return view;
855 }
856 
857 static int
858 view_split_begin_x(int begin_x)
859 {
860 	if (begin_x > 0 || COLS < 120)
861 		return 0;
862 	return (COLS - MAX(COLS / 2, 80));
863 }
864 
865 /* XXX Stub till we decide what to do. */
866 static int
867 view_split_begin_y(int lines)
868 {
869 	return lines * HSPLIT_SCALE;
870 }
871 
872 static const struct got_error *view_resize(struct tog_view *);
873 
874 static const struct got_error *
875 view_splitscreen(struct tog_view *view)
876 {
877 	const struct got_error *err = NULL;
878 
879 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
880 		if (view->resized_y && view->resized_y < view->lines)
881 			view->begin_y = view->resized_y;
882 		else
883 			view->begin_y = view_split_begin_y(view->nlines);
884 		view->begin_x = 0;
885 	} else if (!view->resized) {
886 		if (view->resized_x && view->resized_x < view->cols - 1 &&
887 		    view->cols > 119)
888 			view->begin_x = view->resized_x;
889 		else
890 			view->begin_x = view_split_begin_x(0);
891 		view->begin_y = 0;
892 	}
893 	view->nlines = LINES - view->begin_y;
894 	view->ncols = COLS - view->begin_x;
895 	view->lines = LINES;
896 	view->cols = COLS;
897 	err = view_resize(view);
898 	if (err)
899 		return err;
900 
901 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
902 		view->parent->nlines = view->begin_y;
903 
904 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
905 		return got_error_from_errno("mvwin");
906 
907 	return NULL;
908 }
909 
910 static const struct got_error *
911 view_fullscreen(struct tog_view *view)
912 {
913 	const struct got_error *err = NULL;
914 
915 	view->begin_x = 0;
916 	view->begin_y = view->resized ? view->begin_y : 0;
917 	view->nlines = view->resized ? view->nlines : LINES;
918 	view->ncols = COLS;
919 	view->lines = LINES;
920 	view->cols = COLS;
921 	err = view_resize(view);
922 	if (err)
923 		return err;
924 
925 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
926 		return got_error_from_errno("mvwin");
927 
928 	return NULL;
929 }
930 
931 static int
932 view_is_parent_view(struct tog_view *view)
933 {
934 	return view->parent == NULL;
935 }
936 
937 static int
938 view_is_splitscreen(struct tog_view *view)
939 {
940 	return view->begin_x > 0 || view->begin_y > 0;
941 }
942 
943 static int
944 view_is_fullscreen(struct tog_view *view)
945 {
946 	return view->nlines == LINES && view->ncols == COLS;
947 }
948 
949 static int
950 view_is_hsplit_top(struct tog_view *view)
951 {
952 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
953 	    view_is_splitscreen(view->child);
954 }
955 
956 static void
957 view_border(struct tog_view *view)
958 {
959 	PANEL *panel;
960 	const struct tog_view *view_above;
961 
962 	if (view->parent)
963 		return view_border(view->parent);
964 
965 	panel = panel_above(view->panel);
966 	if (panel == NULL)
967 		return;
968 
969 	view_above = panel_userptr(panel);
970 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
971 		mvwhline(view->window, view_above->begin_y - 1,
972 		    view->begin_x, got_locale_is_utf8() ?
973 		    ACS_HLINE : '-', view->ncols);
974 	else
975 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
976 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
977 }
978 
979 static const struct got_error *view_init_hsplit(struct tog_view *, int);
980 static const struct got_error *request_log_commits(struct tog_view *);
981 static const struct got_error *offset_selection_down(struct tog_view *);
982 static void offset_selection_up(struct tog_view *);
983 static void view_get_split(struct tog_view *, int *, int *);
984 
985 static const struct got_error *
986 view_resize(struct tog_view *view)
987 {
988 	const struct got_error	*err = NULL;
989 	int			 dif, nlines, ncols;
990 
991 	dif = LINES - view->lines;  /* line difference */
992 
993 	if (view->lines > LINES)
994 		nlines = view->nlines - (view->lines - LINES);
995 	else
996 		nlines = view->nlines + (LINES - view->lines);
997 	if (view->cols > COLS)
998 		ncols = view->ncols - (view->cols - COLS);
999 	else
1000 		ncols = view->ncols + (COLS - view->cols);
1001 
1002 	if (view->child) {
1003 		int hs = view->child->begin_y;
1004 
1005 		if (!view_is_fullscreen(view))
1006 			view->child->begin_x = view_split_begin_x(view->begin_x);
1007 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1008 		    view->child->begin_x == 0) {
1009 			ncols = COLS;
1010 
1011 			view_fullscreen(view->child);
1012 			if (view->child->focussed)
1013 				show_panel(view->child->panel);
1014 			else
1015 				show_panel(view->panel);
1016 		} else {
1017 			ncols = view->child->begin_x;
1018 
1019 			view_splitscreen(view->child);
1020 			show_panel(view->child->panel);
1021 		}
1022 		/*
1023 		 * XXX This is ugly and needs to be moved into the above
1024 		 * logic but "works" for now and my attempts at moving it
1025 		 * break either 'tab' or 'F' key maps in horizontal splits.
1026 		 */
1027 		if (hs) {
1028 			err = view_splitscreen(view->child);
1029 			if (err)
1030 				return err;
1031 			if (dif < 0) { /* top split decreased */
1032 				err = offset_selection_down(view);
1033 				if (err)
1034 					return err;
1035 			}
1036 			view_border(view);
1037 			update_panels();
1038 			doupdate();
1039 			show_panel(view->child->panel);
1040 			nlines = view->nlines;
1041 		}
1042 	} else if (view->parent == NULL)
1043 		ncols = COLS;
1044 
1045 	if (view->resize && dif > 0) {
1046 		err = view->resize(view, dif);
1047 		if (err)
1048 			return err;
1049 	}
1050 
1051 	if (wresize(view->window, nlines, ncols) == ERR)
1052 		return got_error_from_errno("wresize");
1053 	if (replace_panel(view->panel, view->window) == ERR)
1054 		return got_error_from_errno("replace_panel");
1055 	wclear(view->window);
1056 
1057 	view->nlines = nlines;
1058 	view->ncols = ncols;
1059 	view->lines = LINES;
1060 	view->cols = COLS;
1061 
1062 	return NULL;
1063 }
1064 
1065 static const struct got_error *
1066 resize_log_view(struct tog_view *view, int increase)
1067 {
1068 	struct tog_log_view_state	*s = &view->state.log;
1069 	const struct got_error		*err = NULL;
1070 	int				 n = 0;
1071 
1072 	if (s->selected_entry)
1073 		n = s->selected_entry->idx + view->lines - s->selected;
1074 
1075 	/*
1076 	 * Request commits to account for the increased
1077 	 * height so we have enough to populate the view.
1078 	 */
1079 	if (s->commits->ncommits < n) {
1080 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1081 		err = request_log_commits(view);
1082 	}
1083 
1084 	return err;
1085 }
1086 
1087 static void
1088 view_adjust_offset(struct tog_view *view, int n)
1089 {
1090 	if (n == 0)
1091 		return;
1092 
1093 	if (view->parent && view->parent->offset) {
1094 		if (view->parent->offset + n >= 0)
1095 			view->parent->offset += n;
1096 		else
1097 			view->parent->offset = 0;
1098 	} else if (view->offset) {
1099 		if (view->offset - n >= 0)
1100 			view->offset -= n;
1101 		else
1102 			view->offset = 0;
1103 	}
1104 }
1105 
1106 static const struct got_error *
1107 view_resize_split(struct tog_view *view, int resize)
1108 {
1109 	const struct got_error	*err = NULL;
1110 	struct tog_view		*v = NULL;
1111 
1112 	if (view->parent)
1113 		v = view->parent;
1114 	else
1115 		v = view;
1116 
1117 	if (!v->child || !view_is_splitscreen(v->child))
1118 		return NULL;
1119 
1120 	v->resized = v->child->resized = resize;  /* lock for resize event */
1121 
1122 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1123 		if (v->child->resized_y)
1124 			v->child->begin_y = v->child->resized_y;
1125 		if (view->parent)
1126 			v->child->begin_y -= resize;
1127 		else
1128 			v->child->begin_y += resize;
1129 		if (v->child->begin_y < 3) {
1130 			view->count = 0;
1131 			v->child->begin_y = 3;
1132 		} else if (v->child->begin_y > LINES - 1) {
1133 			view->count = 0;
1134 			v->child->begin_y = LINES - 1;
1135 		}
1136 		v->ncols = COLS;
1137 		v->child->ncols = COLS;
1138 		view_adjust_offset(view, resize);
1139 		err = view_init_hsplit(v, v->child->begin_y);
1140 		if (err)
1141 			return err;
1142 		v->child->resized_y = v->child->begin_y;
1143 	} else {
1144 		if (v->child->resized_x)
1145 			v->child->begin_x = v->child->resized_x;
1146 		if (view->parent)
1147 			v->child->begin_x -= resize;
1148 		else
1149 			v->child->begin_x += resize;
1150 		if (v->child->begin_x < 11) {
1151 			view->count = 0;
1152 			v->child->begin_x = 11;
1153 		} else if (v->child->begin_x > COLS - 1) {
1154 			view->count = 0;
1155 			v->child->begin_x = COLS - 1;
1156 		}
1157 		v->child->resized_x = v->child->begin_x;
1158 	}
1159 
1160 	v->child->mode = v->mode;
1161 	v->child->nlines = v->lines - v->child->begin_y;
1162 	v->child->ncols = v->cols - v->child->begin_x;
1163 	v->focus_child = 1;
1164 
1165 	err = view_fullscreen(v);
1166 	if (err)
1167 		return err;
1168 	err = view_splitscreen(v->child);
1169 	if (err)
1170 		return err;
1171 
1172 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1173 		err = offset_selection_down(v->child);
1174 		if (err)
1175 			return err;
1176 	}
1177 
1178 	if (v->resize)
1179 		err = v->resize(v, 0);
1180 	else if (v->child->resize)
1181 		err = v->child->resize(v->child, 0);
1182 
1183 	v->resized = v->child->resized = 0;
1184 
1185 	return err;
1186 }
1187 
1188 static void
1189 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1190 {
1191 	struct tog_view *v = src->child ? src->child : src;
1192 
1193 	dst->resized_x = v->resized_x;
1194 	dst->resized_y = v->resized_y;
1195 }
1196 
1197 static const struct got_error *
1198 view_close_child(struct tog_view *view)
1199 {
1200 	const struct got_error *err = NULL;
1201 
1202 	if (view->child == NULL)
1203 		return NULL;
1204 
1205 	err = view_close(view->child);
1206 	view->child = NULL;
1207 	return err;
1208 }
1209 
1210 static const struct got_error *
1211 view_set_child(struct tog_view *view, struct tog_view *child)
1212 {
1213 	const struct got_error *err = NULL;
1214 
1215 	view->child = child;
1216 	child->parent = view;
1217 
1218 	err = view_resize(view);
1219 	if (err)
1220 		return err;
1221 
1222 	if (view->child->resized_x || view->child->resized_y)
1223 		err = view_resize_split(view, 0);
1224 
1225 	return err;
1226 }
1227 
1228 static const struct got_error *view_dispatch_request(struct tog_view **,
1229     struct tog_view *, enum tog_view_type, int, int);
1230 
1231 static const struct got_error *
1232 view_request_new(struct tog_view **requested, struct tog_view *view,
1233     enum tog_view_type request)
1234 {
1235 	struct tog_view		*new_view = NULL;
1236 	const struct got_error	*err;
1237 	int			 y = 0, x = 0;
1238 
1239 	*requested = NULL;
1240 
1241 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1242 		view_get_split(view, &y, &x);
1243 
1244 	err = view_dispatch_request(&new_view, view, request, y, x);
1245 	if (err)
1246 		return err;
1247 
1248 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1249 	    request != TOG_VIEW_HELP) {
1250 		err = view_init_hsplit(view, y);
1251 		if (err)
1252 			return err;
1253 	}
1254 
1255 	view->focussed = 0;
1256 	new_view->focussed = 1;
1257 	new_view->mode = view->mode;
1258 	new_view->nlines = request == TOG_VIEW_HELP ?
1259 	    view->lines : view->lines - y;
1260 
1261 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1262 		view_transfer_size(new_view, view);
1263 		err = view_close_child(view);
1264 		if (err)
1265 			return err;
1266 		err = view_set_child(view, new_view);
1267 		if (err)
1268 			return err;
1269 		view->focus_child = 1;
1270 	} else
1271 		*requested = new_view;
1272 
1273 	return NULL;
1274 }
1275 
1276 static void
1277 tog_resizeterm(void)
1278 {
1279 	int cols, lines;
1280 	struct winsize size;
1281 
1282 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1283 		cols = 80;     /* Default */
1284 		lines = 24;
1285 	} else {
1286 		cols = size.ws_col;
1287 		lines = size.ws_row;
1288 	}
1289 	resize_term(lines, cols);
1290 }
1291 
1292 static const struct got_error *
1293 view_search_start(struct tog_view *view)
1294 {
1295 	const struct got_error *err = NULL;
1296 	struct tog_view *v = view;
1297 	char pattern[1024];
1298 	int ret;
1299 
1300 	if (view->search_started) {
1301 		regfree(&view->regex);
1302 		view->searching = 0;
1303 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1304 	}
1305 	view->search_started = 0;
1306 
1307 	if (view->nlines < 1)
1308 		return NULL;
1309 
1310 	if (view_is_hsplit_top(view))
1311 		v = view->child;
1312 
1313 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1314 	wclrtoeol(v->window);
1315 
1316 	nodelay(view->window, FALSE);  /* block for search term input */
1317 	nocbreak();
1318 	echo();
1319 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1320 	wrefresh(v->window);
1321 	cbreak();
1322 	noecho();
1323 	nodelay(view->window, TRUE);
1324 	if (ret == ERR)
1325 		return NULL;
1326 
1327 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1328 		err = view->search_start(view);
1329 		if (err) {
1330 			regfree(&view->regex);
1331 			return err;
1332 		}
1333 		view->search_started = 1;
1334 		view->searching = TOG_SEARCH_FORWARD;
1335 		view->search_next_done = 0;
1336 		view->search_next(view);
1337 	}
1338 
1339 	return NULL;
1340 }
1341 
1342 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1343 static const struct got_error *
1344 switch_split(struct tog_view *view)
1345 {
1346 	const struct got_error	*err = NULL;
1347 	struct tog_view		*v = NULL;
1348 
1349 	if (view->parent)
1350 		v = view->parent;
1351 	else
1352 		v = view;
1353 
1354 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1355 		v->mode = TOG_VIEW_SPLIT_VERT;
1356 	else
1357 		v->mode = TOG_VIEW_SPLIT_HRZN;
1358 
1359 	if (!v->child)
1360 		return NULL;
1361 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1362 		v->mode = TOG_VIEW_SPLIT_NONE;
1363 
1364 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1365 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1366 		v->child->begin_y = v->child->resized_y;
1367 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1368 		v->child->begin_x = v->child->resized_x;
1369 
1370 
1371 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1372 		v->ncols = COLS;
1373 		v->child->ncols = COLS;
1374 		v->child->nscrolled = LINES - v->child->nlines;
1375 
1376 		err = view_init_hsplit(v, v->child->begin_y);
1377 		if (err)
1378 			return err;
1379 	}
1380 	v->child->mode = v->mode;
1381 	v->child->nlines = v->lines - v->child->begin_y;
1382 	v->focus_child = 1;
1383 
1384 	err = view_fullscreen(v);
1385 	if (err)
1386 		return err;
1387 	err = view_splitscreen(v->child);
1388 	if (err)
1389 		return err;
1390 
1391 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1392 		v->mode = TOG_VIEW_SPLIT_VERT;
1393 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1394 		err = offset_selection_down(v);
1395 		if (err)
1396 			return err;
1397 		err = offset_selection_down(v->child);
1398 		if (err)
1399 			return err;
1400 	} else {
1401 		offset_selection_up(v);
1402 		offset_selection_up(v->child);
1403 	}
1404 	if (v->resize)
1405 		err = v->resize(v, 0);
1406 	else if (v->child->resize)
1407 		err = v->child->resize(v->child, 0);
1408 
1409 	return err;
1410 }
1411 
1412 /*
1413  * Compute view->count from numeric input. Assign total to view->count and
1414  * return first non-numeric key entered.
1415  */
1416 static int
1417 get_compound_key(struct tog_view *view, int c)
1418 {
1419 	struct tog_view	*v = view;
1420 	int		 x, n = 0;
1421 
1422 	if (view_is_hsplit_top(view))
1423 		v = view->child;
1424 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1425 		v = view->parent;
1426 
1427 	view->count = 0;
1428 	cbreak();  /* block for input */
1429 	nodelay(view->window, FALSE);
1430 	wmove(v->window, v->nlines - 1, 0);
1431 	wclrtoeol(v->window);
1432 	waddch(v->window, ':');
1433 
1434 	do {
1435 		x = getcurx(v->window);
1436 		if (x != ERR && x < view->ncols) {
1437 			waddch(v->window, c);
1438 			wrefresh(v->window);
1439 		}
1440 
1441 		/*
1442 		 * Don't overflow. Max valid request should be the greatest
1443 		 * between the longest and total lines; cap at 10 million.
1444 		 */
1445 		if (n >= 9999999)
1446 			n = 9999999;
1447 		else
1448 			n = n * 10 + (c - '0');
1449 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1450 
1451 	if (c == 'G' || c == 'g') {	/* nG key map */
1452 		view->gline = view->hiline = n;
1453 		n = 0;
1454 		c = 0;
1455 	}
1456 
1457 	/* Massage excessive or inapplicable values at the input handler. */
1458 	view->count = n;
1459 
1460 	return c;
1461 }
1462 
1463 static const struct got_error *
1464 view_input(struct tog_view **new, int *done, struct tog_view *view,
1465     struct tog_view_list_head *views)
1466 {
1467 	const struct got_error *err = NULL;
1468 	struct tog_view *v;
1469 	int ch, errcode;
1470 
1471 	*new = NULL;
1472 
1473 	/* Clear "no matches" indicator. */
1474 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1475 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1476 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1477 		view->count = 0;
1478 	}
1479 
1480 	if (view->searching && !view->search_next_done) {
1481 		errcode = pthread_mutex_unlock(&tog_mutex);
1482 		if (errcode)
1483 			return got_error_set_errno(errcode,
1484 			    "pthread_mutex_unlock");
1485 		sched_yield();
1486 		errcode = pthread_mutex_lock(&tog_mutex);
1487 		if (errcode)
1488 			return got_error_set_errno(errcode,
1489 			    "pthread_mutex_lock");
1490 		view->search_next(view);
1491 		return NULL;
1492 	}
1493 
1494 	/* Allow threads to make progress while we are waiting for input. */
1495 	errcode = pthread_mutex_unlock(&tog_mutex);
1496 	if (errcode)
1497 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1498 	/* If we have an unfinished count, let C-g or backspace abort. */
1499 	if (view->count && --view->count) {
1500 		cbreak();
1501 		nodelay(view->window, TRUE);
1502 		ch = wgetch(view->window);
1503 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1504 			view->count = 0;
1505 		else
1506 			ch = view->ch;
1507 	} else {
1508 		ch = wgetch(view->window);
1509 		if (ch >= '1' && ch  <= '9')
1510 			view->ch = ch = get_compound_key(view, ch);
1511 	}
1512 	if (view->hiline && ch != ERR && ch != 0)
1513 		view->hiline = 0;  /* key pressed, clear line highlight */
1514 	nodelay(view->window, TRUE);
1515 	errcode = pthread_mutex_lock(&tog_mutex);
1516 	if (errcode)
1517 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1518 
1519 	if (tog_sigwinch_received || tog_sigcont_received) {
1520 		tog_resizeterm();
1521 		tog_sigwinch_received = 0;
1522 		tog_sigcont_received = 0;
1523 		TAILQ_FOREACH(v, views, entry) {
1524 			err = view_resize(v);
1525 			if (err)
1526 				return err;
1527 			err = v->input(new, v, KEY_RESIZE);
1528 			if (err)
1529 				return err;
1530 			if (v->child) {
1531 				err = view_resize(v->child);
1532 				if (err)
1533 					return err;
1534 				err = v->child->input(new, v->child,
1535 				    KEY_RESIZE);
1536 				if (err)
1537 					return err;
1538 				if (v->child->resized_x || v->child->resized_y) {
1539 					err = view_resize_split(v, 0);
1540 					if (err)
1541 						return err;
1542 				}
1543 			}
1544 		}
1545 	}
1546 
1547 	switch (ch) {
1548 	case '?':
1549 	case 'H':
1550 	case KEY_F(1):
1551 		if (view->type == TOG_VIEW_HELP)
1552 			err = view->reset(view);
1553 		else
1554 			err = view_request_new(new, view, TOG_VIEW_HELP);
1555 		break;
1556 	case '\t':
1557 		view->count = 0;
1558 		if (view->child) {
1559 			view->focussed = 0;
1560 			view->child->focussed = 1;
1561 			view->focus_child = 1;
1562 		} else if (view->parent) {
1563 			view->focussed = 0;
1564 			view->parent->focussed = 1;
1565 			view->parent->focus_child = 0;
1566 			if (!view_is_splitscreen(view)) {
1567 				if (view->parent->resize) {
1568 					err = view->parent->resize(view->parent,
1569 					    0);
1570 					if (err)
1571 						return err;
1572 				}
1573 				offset_selection_up(view->parent);
1574 				err = view_fullscreen(view->parent);
1575 				if (err)
1576 					return err;
1577 			}
1578 		}
1579 		break;
1580 	case 'q':
1581 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1582 			if (view->parent->resize) {
1583 				/* might need more commits to fill fullscreen */
1584 				err = view->parent->resize(view->parent, 0);
1585 				if (err)
1586 					break;
1587 			}
1588 			offset_selection_up(view->parent);
1589 		}
1590 		err = view->input(new, view, ch);
1591 		view->dying = 1;
1592 		break;
1593 	case 'Q':
1594 		*done = 1;
1595 		break;
1596 	case 'F':
1597 		view->count = 0;
1598 		if (view_is_parent_view(view)) {
1599 			if (view->child == NULL)
1600 				break;
1601 			if (view_is_splitscreen(view->child)) {
1602 				view->focussed = 0;
1603 				view->child->focussed = 1;
1604 				err = view_fullscreen(view->child);
1605 			} else {
1606 				err = view_splitscreen(view->child);
1607 				if (!err)
1608 					err = view_resize_split(view, 0);
1609 			}
1610 			if (err)
1611 				break;
1612 			err = view->child->input(new, view->child,
1613 			    KEY_RESIZE);
1614 		} else {
1615 			if (view_is_splitscreen(view)) {
1616 				view->parent->focussed = 0;
1617 				view->focussed = 1;
1618 				err = view_fullscreen(view);
1619 			} else {
1620 				err = view_splitscreen(view);
1621 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1622 					err = view_resize(view->parent);
1623 				if (!err)
1624 					err = view_resize_split(view, 0);
1625 			}
1626 			if (err)
1627 				break;
1628 			err = view->input(new, view, KEY_RESIZE);
1629 		}
1630 		if (err)
1631 			break;
1632 		if (view->resize) {
1633 			err = view->resize(view, 0);
1634 			if (err)
1635 				break;
1636 		}
1637 		if (view->parent)
1638 			err = offset_selection_down(view->parent);
1639 		if (!err)
1640 			err = offset_selection_down(view);
1641 		break;
1642 	case 'S':
1643 		view->count = 0;
1644 		err = switch_split(view);
1645 		break;
1646 	case '-':
1647 		err = view_resize_split(view, -1);
1648 		break;
1649 	case '+':
1650 		err = view_resize_split(view, 1);
1651 		break;
1652 	case KEY_RESIZE:
1653 		break;
1654 	case '/':
1655 		view->count = 0;
1656 		if (view->search_start)
1657 			view_search_start(view);
1658 		else
1659 			err = view->input(new, view, ch);
1660 		break;
1661 	case 'N':
1662 	case 'n':
1663 		if (view->search_started && view->search_next) {
1664 			view->searching = (ch == 'n' ?
1665 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1666 			view->search_next_done = 0;
1667 			view->search_next(view);
1668 		} else
1669 			err = view->input(new, view, ch);
1670 		break;
1671 	case 'A':
1672 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1673 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1674 		else
1675 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1676 		TAILQ_FOREACH(v, views, entry) {
1677 			if (v->reset) {
1678 				err = v->reset(v);
1679 				if (err)
1680 					return err;
1681 			}
1682 			if (v->child && v->child->reset) {
1683 				err = v->child->reset(v->child);
1684 				if (err)
1685 					return err;
1686 			}
1687 		}
1688 		break;
1689 	default:
1690 		err = view->input(new, view, ch);
1691 		break;
1692 	}
1693 
1694 	return err;
1695 }
1696 
1697 static int
1698 view_needs_focus_indication(struct tog_view *view)
1699 {
1700 	if (view_is_parent_view(view)) {
1701 		if (view->child == NULL || view->child->focussed)
1702 			return 0;
1703 		if (!view_is_splitscreen(view->child))
1704 			return 0;
1705 	} else if (!view_is_splitscreen(view))
1706 		return 0;
1707 
1708 	return view->focussed;
1709 }
1710 
1711 static const struct got_error *
1712 view_loop(struct tog_view *view)
1713 {
1714 	const struct got_error *err = NULL;
1715 	struct tog_view_list_head views;
1716 	struct tog_view *new_view;
1717 	char *mode;
1718 	int fast_refresh = 10;
1719 	int done = 0, errcode;
1720 
1721 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1722 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1723 		view->mode = TOG_VIEW_SPLIT_VERT;
1724 	else
1725 		view->mode = TOG_VIEW_SPLIT_HRZN;
1726 
1727 	errcode = pthread_mutex_lock(&tog_mutex);
1728 	if (errcode)
1729 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1730 
1731 	TAILQ_INIT(&views);
1732 	TAILQ_INSERT_HEAD(&views, view, entry);
1733 
1734 	view->focussed = 1;
1735 	err = view->show(view);
1736 	if (err)
1737 		return err;
1738 	update_panels();
1739 	doupdate();
1740 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1741 	    !tog_fatal_signal_received()) {
1742 		/* Refresh fast during initialization, then become slower. */
1743 		if (fast_refresh && fast_refresh-- == 0)
1744 			halfdelay(10); /* switch to once per second */
1745 
1746 		err = view_input(&new_view, &done, view, &views);
1747 		if (err)
1748 			break;
1749 		if (view->dying) {
1750 			struct tog_view *v, *prev = NULL;
1751 
1752 			if (view_is_parent_view(view))
1753 				prev = TAILQ_PREV(view, tog_view_list_head,
1754 				    entry);
1755 			else if (view->parent)
1756 				prev = view->parent;
1757 
1758 			if (view->parent) {
1759 				view->parent->child = NULL;
1760 				view->parent->focus_child = 0;
1761 				/* Restore fullscreen line height. */
1762 				view->parent->nlines = view->parent->lines;
1763 				err = view_resize(view->parent);
1764 				if (err)
1765 					break;
1766 				/* Make resized splits persist. */
1767 				view_transfer_size(view->parent, view);
1768 			} else
1769 				TAILQ_REMOVE(&views, view, entry);
1770 
1771 			err = view_close(view);
1772 			if (err)
1773 				goto done;
1774 
1775 			view = NULL;
1776 			TAILQ_FOREACH(v, &views, entry) {
1777 				if (v->focussed)
1778 					break;
1779 			}
1780 			if (view == NULL && new_view == NULL) {
1781 				/* No view has focus. Try to pick one. */
1782 				if (prev)
1783 					view = prev;
1784 				else if (!TAILQ_EMPTY(&views)) {
1785 					view = TAILQ_LAST(&views,
1786 					    tog_view_list_head);
1787 				}
1788 				if (view) {
1789 					if (view->focus_child) {
1790 						view->child->focussed = 1;
1791 						view = view->child;
1792 					} else
1793 						view->focussed = 1;
1794 				}
1795 			}
1796 		}
1797 		if (new_view) {
1798 			struct tog_view *v, *t;
1799 			/* Only allow one parent view per type. */
1800 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1801 				if (v->type != new_view->type)
1802 					continue;
1803 				TAILQ_REMOVE(&views, v, entry);
1804 				err = view_close(v);
1805 				if (err)
1806 					goto done;
1807 				break;
1808 			}
1809 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1810 			view = new_view;
1811 		}
1812 		if (view) {
1813 			if (view_is_parent_view(view)) {
1814 				if (view->child && view->child->focussed)
1815 					view = view->child;
1816 			} else {
1817 				if (view->parent && view->parent->focussed)
1818 					view = view->parent;
1819 			}
1820 			show_panel(view->panel);
1821 			if (view->child && view_is_splitscreen(view->child))
1822 				show_panel(view->child->panel);
1823 			if (view->parent && view_is_splitscreen(view)) {
1824 				err = view->parent->show(view->parent);
1825 				if (err)
1826 					goto done;
1827 			}
1828 			err = view->show(view);
1829 			if (err)
1830 				goto done;
1831 			if (view->child) {
1832 				err = view->child->show(view->child);
1833 				if (err)
1834 					goto done;
1835 			}
1836 			update_panels();
1837 			doupdate();
1838 		}
1839 	}
1840 done:
1841 	while (!TAILQ_EMPTY(&views)) {
1842 		const struct got_error *close_err;
1843 		view = TAILQ_FIRST(&views);
1844 		TAILQ_REMOVE(&views, view, entry);
1845 		close_err = view_close(view);
1846 		if (close_err && err == NULL)
1847 			err = close_err;
1848 	}
1849 
1850 	errcode = pthread_mutex_unlock(&tog_mutex);
1851 	if (errcode && err == NULL)
1852 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1853 
1854 	return err;
1855 }
1856 
1857 __dead static void
1858 usage_log(void)
1859 {
1860 	endwin();
1861 	fprintf(stderr,
1862 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1863 	    getprogname());
1864 	exit(1);
1865 }
1866 
1867 /* Create newly allocated wide-character string equivalent to a byte string. */
1868 static const struct got_error *
1869 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1870 {
1871 	char *vis = NULL;
1872 	const struct got_error *err = NULL;
1873 
1874 	*ws = NULL;
1875 	*wlen = mbstowcs(NULL, s, 0);
1876 	if (*wlen == (size_t)-1) {
1877 		int vislen;
1878 		if (errno != EILSEQ)
1879 			return got_error_from_errno("mbstowcs");
1880 
1881 		/* byte string invalid in current encoding; try to "fix" it */
1882 		err = got_mbsavis(&vis, &vislen, s);
1883 		if (err)
1884 			return err;
1885 		*wlen = mbstowcs(NULL, vis, 0);
1886 		if (*wlen == (size_t)-1) {
1887 			err = got_error_from_errno("mbstowcs"); /* give up */
1888 			goto done;
1889 		}
1890 	}
1891 
1892 	*ws = calloc(*wlen + 1, sizeof(**ws));
1893 	if (*ws == NULL) {
1894 		err = got_error_from_errno("calloc");
1895 		goto done;
1896 	}
1897 
1898 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1899 		err = got_error_from_errno("mbstowcs");
1900 done:
1901 	free(vis);
1902 	if (err) {
1903 		free(*ws);
1904 		*ws = NULL;
1905 		*wlen = 0;
1906 	}
1907 	return err;
1908 }
1909 
1910 static const struct got_error *
1911 expand_tab(char **ptr, const char *src)
1912 {
1913 	char	*dst;
1914 	size_t	 len, n, idx = 0, sz = 0;
1915 
1916 	*ptr = NULL;
1917 	n = len = strlen(src);
1918 	dst = malloc(n + 1);
1919 	if (dst == NULL)
1920 		return got_error_from_errno("malloc");
1921 
1922 	while (idx < len && src[idx]) {
1923 		const char c = src[idx];
1924 
1925 		if (c == '\t') {
1926 			size_t nb = TABSIZE - sz % TABSIZE;
1927 			char *p;
1928 
1929 			p = realloc(dst, n + nb);
1930 			if (p == NULL) {
1931 				free(dst);
1932 				return got_error_from_errno("realloc");
1933 
1934 			}
1935 			dst = p;
1936 			n += nb;
1937 			memset(dst + sz, ' ', nb);
1938 			sz += nb;
1939 		} else
1940 			dst[sz++] = src[idx];
1941 		++idx;
1942 	}
1943 
1944 	dst[sz] = '\0';
1945 	*ptr = dst;
1946 	return NULL;
1947 }
1948 
1949 /*
1950  * Advance at most n columns from wline starting at offset off.
1951  * Return the index to the first character after the span operation.
1952  * Return the combined column width of all spanned wide character in
1953  * *rcol.
1954  */
1955 static int
1956 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1957 {
1958 	int width, i, cols = 0;
1959 
1960 	if (n == 0) {
1961 		*rcol = cols;
1962 		return off;
1963 	}
1964 
1965 	for (i = off; wline[i] != L'\0'; ++i) {
1966 		if (wline[i] == L'\t')
1967 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1968 		else
1969 			width = wcwidth(wline[i]);
1970 
1971 		if (width == -1) {
1972 			width = 1;
1973 			wline[i] = L'.';
1974 		}
1975 
1976 		if (cols + width > n)
1977 			break;
1978 		cols += width;
1979 	}
1980 
1981 	*rcol = cols;
1982 	return i;
1983 }
1984 
1985 /*
1986  * Format a line for display, ensuring that it won't overflow a width limit.
1987  * With scrolling, the width returned refers to the scrolled version of the
1988  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1989  */
1990 static const struct got_error *
1991 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1992     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1993 {
1994 	const struct got_error *err = NULL;
1995 	int cols;
1996 	wchar_t *wline = NULL;
1997 	char *exstr = NULL;
1998 	size_t wlen;
1999 	int i, scrollx;
2000 
2001 	*wlinep = NULL;
2002 	*widthp = 0;
2003 
2004 	if (expand) {
2005 		err = expand_tab(&exstr, line);
2006 		if (err)
2007 			return err;
2008 	}
2009 
2010 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2011 	free(exstr);
2012 	if (err)
2013 		return err;
2014 
2015 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2016 
2017 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2018 		wline[wlen - 1] = L'\0';
2019 		wlen--;
2020 	}
2021 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2022 		wline[wlen - 1] = L'\0';
2023 		wlen--;
2024 	}
2025 
2026 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2027 	wline[i] = L'\0';
2028 
2029 	if (widthp)
2030 		*widthp = cols;
2031 	if (scrollxp)
2032 		*scrollxp = scrollx;
2033 	if (err)
2034 		free(wline);
2035 	else
2036 		*wlinep = wline;
2037 	return err;
2038 }
2039 
2040 static const struct got_error*
2041 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2042     struct got_object_id *id, struct got_repository *repo)
2043 {
2044 	static const struct got_error *err = NULL;
2045 	struct got_reflist_entry *re;
2046 	char *s;
2047 	const char *name;
2048 
2049 	*refs_str = NULL;
2050 
2051 	TAILQ_FOREACH(re, refs, entry) {
2052 		struct got_tag_object *tag = NULL;
2053 		struct got_object_id *ref_id;
2054 		int cmp;
2055 
2056 		name = got_ref_get_name(re->ref);
2057 		if (strcmp(name, GOT_REF_HEAD) == 0)
2058 			continue;
2059 		if (strncmp(name, "refs/", 5) == 0)
2060 			name += 5;
2061 		if (strncmp(name, "got/", 4) == 0 &&
2062 		    strncmp(name, "got/backup/", 11) != 0)
2063 			continue;
2064 		if (strncmp(name, "heads/", 6) == 0)
2065 			name += 6;
2066 		if (strncmp(name, "remotes/", 8) == 0) {
2067 			name += 8;
2068 			s = strstr(name, "/" GOT_REF_HEAD);
2069 			if (s != NULL && s[strlen(s)] == '\0')
2070 				continue;
2071 		}
2072 		err = got_ref_resolve(&ref_id, repo, re->ref);
2073 		if (err)
2074 			break;
2075 		if (strncmp(name, "tags/", 5) == 0) {
2076 			err = got_object_open_as_tag(&tag, repo, ref_id);
2077 			if (err) {
2078 				if (err->code != GOT_ERR_OBJ_TYPE) {
2079 					free(ref_id);
2080 					break;
2081 				}
2082 				/* Ref points at something other than a tag. */
2083 				err = NULL;
2084 				tag = NULL;
2085 			}
2086 		}
2087 		cmp = got_object_id_cmp(tag ?
2088 		    got_object_tag_get_object_id(tag) : ref_id, id);
2089 		free(ref_id);
2090 		if (tag)
2091 			got_object_tag_close(tag);
2092 		if (cmp != 0)
2093 			continue;
2094 		s = *refs_str;
2095 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2096 		    s ? ", " : "", name) == -1) {
2097 			err = got_error_from_errno("asprintf");
2098 			free(s);
2099 			*refs_str = NULL;
2100 			break;
2101 		}
2102 		free(s);
2103 	}
2104 
2105 	return err;
2106 }
2107 
2108 static const struct got_error *
2109 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2110     int col_tab_align)
2111 {
2112 	char *smallerthan;
2113 
2114 	smallerthan = strchr(author, '<');
2115 	if (smallerthan && smallerthan[1] != '\0')
2116 		author = smallerthan + 1;
2117 	author[strcspn(author, "@>")] = '\0';
2118 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2119 	    col_tab_align, 0);
2120 }
2121 
2122 static const struct got_error *
2123 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2124     struct got_object_id *id, const size_t date_display_cols,
2125     int author_display_cols)
2126 {
2127 	struct tog_log_view_state *s = &view->state.log;
2128 	const struct got_error *err = NULL;
2129 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2130 	char *logmsg0 = NULL, *logmsg = NULL;
2131 	char *author = NULL;
2132 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2133 	int author_width, logmsg_width;
2134 	char *newline, *line = NULL;
2135 	int col, limit, scrollx;
2136 	const int avail = view->ncols;
2137 	struct tm tm;
2138 	time_t committer_time;
2139 	struct tog_color *tc;
2140 
2141 	committer_time = got_object_commit_get_committer_time(commit);
2142 	if (gmtime_r(&committer_time, &tm) == NULL)
2143 		return got_error_from_errno("gmtime_r");
2144 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2145 		return got_error(GOT_ERR_NO_SPACE);
2146 
2147 	if (avail <= date_display_cols)
2148 		limit = MIN(sizeof(datebuf) - 1, avail);
2149 	else
2150 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2151 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2152 	if (tc)
2153 		wattr_on(view->window,
2154 		    COLOR_PAIR(tc->colorpair), NULL);
2155 	waddnstr(view->window, datebuf, limit);
2156 	if (tc)
2157 		wattr_off(view->window,
2158 		    COLOR_PAIR(tc->colorpair), NULL);
2159 	col = limit;
2160 	if (col > avail)
2161 		goto done;
2162 
2163 	if (avail >= 120) {
2164 		char *id_str;
2165 		err = got_object_id_str(&id_str, id);
2166 		if (err)
2167 			goto done;
2168 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2169 		if (tc)
2170 			wattr_on(view->window,
2171 			    COLOR_PAIR(tc->colorpair), NULL);
2172 		wprintw(view->window, "%.8s ", id_str);
2173 		if (tc)
2174 			wattr_off(view->window,
2175 			    COLOR_PAIR(tc->colorpair), NULL);
2176 		free(id_str);
2177 		col += 9;
2178 		if (col > avail)
2179 			goto done;
2180 	}
2181 
2182 	if (s->use_committer)
2183 		author = strdup(got_object_commit_get_committer(commit));
2184 	else
2185 		author = strdup(got_object_commit_get_author(commit));
2186 	if (author == NULL) {
2187 		err = got_error_from_errno("strdup");
2188 		goto done;
2189 	}
2190 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2191 	if (err)
2192 		goto done;
2193 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2194 	if (tc)
2195 		wattr_on(view->window,
2196 		    COLOR_PAIR(tc->colorpair), NULL);
2197 	waddwstr(view->window, wauthor);
2198 	col += author_width;
2199 	while (col < avail && author_width < author_display_cols + 2) {
2200 		waddch(view->window, ' ');
2201 		col++;
2202 		author_width++;
2203 	}
2204 	if (tc)
2205 		wattr_off(view->window,
2206 		    COLOR_PAIR(tc->colorpair), NULL);
2207 	if (col > avail)
2208 		goto done;
2209 
2210 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2211 	if (err)
2212 		goto done;
2213 	logmsg = logmsg0;
2214 	while (*logmsg == '\n')
2215 		logmsg++;
2216 	newline = strchr(logmsg, '\n');
2217 	if (newline)
2218 		*newline = '\0';
2219 	limit = avail - col;
2220 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2221 		limit--;	/* for the border */
2222 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2223 	    limit, col, 1);
2224 	if (err)
2225 		goto done;
2226 	waddwstr(view->window, &wlogmsg[scrollx]);
2227 	col += MAX(logmsg_width, 0);
2228 	while (col < avail) {
2229 		waddch(view->window, ' ');
2230 		col++;
2231 	}
2232 done:
2233 	free(logmsg0);
2234 	free(wlogmsg);
2235 	free(author);
2236 	free(wauthor);
2237 	free(line);
2238 	return err;
2239 }
2240 
2241 static struct commit_queue_entry *
2242 alloc_commit_queue_entry(struct got_commit_object *commit,
2243     struct got_object_id *id)
2244 {
2245 	struct commit_queue_entry *entry;
2246 	struct got_object_id *dup;
2247 
2248 	entry = calloc(1, sizeof(*entry));
2249 	if (entry == NULL)
2250 		return NULL;
2251 
2252 	dup = got_object_id_dup(id);
2253 	if (dup == NULL) {
2254 		free(entry);
2255 		return NULL;
2256 	}
2257 
2258 	entry->id = dup;
2259 	entry->commit = commit;
2260 	return entry;
2261 }
2262 
2263 static void
2264 pop_commit(struct commit_queue *commits)
2265 {
2266 	struct commit_queue_entry *entry;
2267 
2268 	entry = TAILQ_FIRST(&commits->head);
2269 	TAILQ_REMOVE(&commits->head, entry, entry);
2270 	got_object_commit_close(entry->commit);
2271 	commits->ncommits--;
2272 	free(entry->id);
2273 	free(entry);
2274 }
2275 
2276 static void
2277 free_commits(struct commit_queue *commits)
2278 {
2279 	while (!TAILQ_EMPTY(&commits->head))
2280 		pop_commit(commits);
2281 }
2282 
2283 static const struct got_error *
2284 match_commit(int *have_match, struct got_object_id *id,
2285     struct got_commit_object *commit, regex_t *regex)
2286 {
2287 	const struct got_error *err = NULL;
2288 	regmatch_t regmatch;
2289 	char *id_str = NULL, *logmsg = NULL;
2290 
2291 	*have_match = 0;
2292 
2293 	err = got_object_id_str(&id_str, id);
2294 	if (err)
2295 		return err;
2296 
2297 	err = got_object_commit_get_logmsg(&logmsg, commit);
2298 	if (err)
2299 		goto done;
2300 
2301 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2302 	    &regmatch, 0) == 0 ||
2303 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2304 	    &regmatch, 0) == 0 ||
2305 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2306 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2307 		*have_match = 1;
2308 done:
2309 	free(id_str);
2310 	free(logmsg);
2311 	return err;
2312 }
2313 
2314 static const struct got_error *
2315 queue_commits(struct tog_log_thread_args *a)
2316 {
2317 	const struct got_error *err = NULL;
2318 
2319 	/*
2320 	 * We keep all commits open throughout the lifetime of the log
2321 	 * view in order to avoid having to re-fetch commits from disk
2322 	 * while updating the display.
2323 	 */
2324 	do {
2325 		struct got_object_id id;
2326 		struct got_commit_object *commit;
2327 		struct commit_queue_entry *entry;
2328 		int limit_match = 0;
2329 		int errcode;
2330 
2331 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2332 		    NULL, NULL);
2333 		if (err)
2334 			break;
2335 
2336 		err = got_object_open_as_commit(&commit, a->repo, &id);
2337 		if (err)
2338 			break;
2339 		entry = alloc_commit_queue_entry(commit, &id);
2340 		if (entry == NULL) {
2341 			err = got_error_from_errno("alloc_commit_queue_entry");
2342 			break;
2343 		}
2344 
2345 		errcode = pthread_mutex_lock(&tog_mutex);
2346 		if (errcode) {
2347 			err = got_error_set_errno(errcode,
2348 			    "pthread_mutex_lock");
2349 			break;
2350 		}
2351 
2352 		entry->idx = a->real_commits->ncommits;
2353 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2354 		a->real_commits->ncommits++;
2355 
2356 		if (*a->limiting) {
2357 			err = match_commit(&limit_match, &id, commit,
2358 			    a->limit_regex);
2359 			if (err)
2360 				break;
2361 
2362 			if (limit_match) {
2363 				struct commit_queue_entry *matched;
2364 
2365 				matched = alloc_commit_queue_entry(
2366 				    entry->commit, entry->id);
2367 				if (matched == NULL) {
2368 					err = got_error_from_errno(
2369 					    "alloc_commit_queue_entry");
2370 					break;
2371 				}
2372 				matched->commit = entry->commit;
2373 				got_object_commit_retain(entry->commit);
2374 
2375 				matched->idx = a->limit_commits->ncommits;
2376 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2377 				    matched, entry);
2378 				a->limit_commits->ncommits++;
2379 			}
2380 
2381 			/*
2382 			 * This is how we signal log_thread() that we
2383 			 * have found a match, and that it should be
2384 			 * counted as a new entry for the view.
2385 			 */
2386 			a->limit_match = limit_match;
2387 		}
2388 
2389 		if (*a->searching == TOG_SEARCH_FORWARD &&
2390 		    !*a->search_next_done) {
2391 			int have_match;
2392 			err = match_commit(&have_match, &id, commit, a->regex);
2393 			if (err)
2394 				break;
2395 
2396 			if (*a->limiting) {
2397 				if (limit_match && have_match)
2398 					*a->search_next_done =
2399 					    TOG_SEARCH_HAVE_MORE;
2400 			} else if (have_match)
2401 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2402 		}
2403 
2404 		errcode = pthread_mutex_unlock(&tog_mutex);
2405 		if (errcode && err == NULL)
2406 			err = got_error_set_errno(errcode,
2407 			    "pthread_mutex_unlock");
2408 		if (err)
2409 			break;
2410 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2411 
2412 	return err;
2413 }
2414 
2415 static void
2416 select_commit(struct tog_log_view_state *s)
2417 {
2418 	struct commit_queue_entry *entry;
2419 	int ncommits = 0;
2420 
2421 	entry = s->first_displayed_entry;
2422 	while (entry) {
2423 		if (ncommits == s->selected) {
2424 			s->selected_entry = entry;
2425 			break;
2426 		}
2427 		entry = TAILQ_NEXT(entry, entry);
2428 		ncommits++;
2429 	}
2430 }
2431 
2432 static const struct got_error *
2433 draw_commits(struct tog_view *view)
2434 {
2435 	const struct got_error *err = NULL;
2436 	struct tog_log_view_state *s = &view->state.log;
2437 	struct commit_queue_entry *entry = s->selected_entry;
2438 	int limit = view->nlines;
2439 	int width;
2440 	int ncommits, author_cols = 4;
2441 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2442 	char *refs_str = NULL;
2443 	wchar_t *wline;
2444 	struct tog_color *tc;
2445 	static const size_t date_display_cols = 12;
2446 
2447 	if (view_is_hsplit_top(view))
2448 		--limit;  /* account for border */
2449 
2450 	if (s->selected_entry &&
2451 	    !(view->searching && view->search_next_done == 0)) {
2452 		struct got_reflist_head *refs;
2453 		err = got_object_id_str(&id_str, s->selected_entry->id);
2454 		if (err)
2455 			return err;
2456 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2457 		    s->selected_entry->id);
2458 		if (refs) {
2459 			err = build_refs_str(&refs_str, refs,
2460 			    s->selected_entry->id, s->repo);
2461 			if (err)
2462 				goto done;
2463 		}
2464 	}
2465 
2466 	if (s->thread_args.commits_needed == 0)
2467 		halfdelay(10); /* disable fast refresh */
2468 
2469 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2470 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2471 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2472 		    (view->searching && !view->search_next_done) ?
2473 		    "searching..." : "loading...") == -1) {
2474 			err = got_error_from_errno("asprintf");
2475 			goto done;
2476 		}
2477 	} else {
2478 		const char *search_str = NULL;
2479 		const char *limit_str = NULL;
2480 
2481 		if (view->searching) {
2482 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2483 				search_str = "no more matches";
2484 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2485 				search_str = "no matches found";
2486 			else if (!view->search_next_done)
2487 				search_str = "searching...";
2488 		}
2489 
2490 		if (s->limit_view && s->commits->ncommits == 0)
2491 			limit_str = "no matches found";
2492 
2493 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2494 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2495 		    search_str ? search_str : (refs_str ? refs_str : ""),
2496 		    limit_str ? limit_str : "") == -1) {
2497 			err = got_error_from_errno("asprintf");
2498 			goto done;
2499 		}
2500 	}
2501 
2502 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2503 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2504 		    "........................................",
2505 		    s->in_repo_path, ncommits_str) == -1) {
2506 			err = got_error_from_errno("asprintf");
2507 			header = NULL;
2508 			goto done;
2509 		}
2510 	} else if (asprintf(&header, "commit %s%s",
2511 	    id_str ? id_str : "........................................",
2512 	    ncommits_str) == -1) {
2513 		err = got_error_from_errno("asprintf");
2514 		header = NULL;
2515 		goto done;
2516 	}
2517 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2518 	if (err)
2519 		goto done;
2520 
2521 	werase(view->window);
2522 
2523 	if (view_needs_focus_indication(view))
2524 		wstandout(view->window);
2525 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2526 	if (tc)
2527 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2528 	waddwstr(view->window, wline);
2529 	while (width < view->ncols) {
2530 		waddch(view->window, ' ');
2531 		width++;
2532 	}
2533 	if (tc)
2534 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2535 	if (view_needs_focus_indication(view))
2536 		wstandend(view->window);
2537 	free(wline);
2538 	if (limit <= 1)
2539 		goto done;
2540 
2541 	/* Grow author column size if necessary, and set view->maxx. */
2542 	entry = s->first_displayed_entry;
2543 	ncommits = 0;
2544 	view->maxx = 0;
2545 	while (entry) {
2546 		struct got_commit_object *c = entry->commit;
2547 		char *author, *eol, *msg, *msg0;
2548 		wchar_t *wauthor, *wmsg;
2549 		int width;
2550 		if (ncommits >= limit - 1)
2551 			break;
2552 		if (s->use_committer)
2553 			author = strdup(got_object_commit_get_committer(c));
2554 		else
2555 			author = strdup(got_object_commit_get_author(c));
2556 		if (author == NULL) {
2557 			err = got_error_from_errno("strdup");
2558 			goto done;
2559 		}
2560 		err = format_author(&wauthor, &width, author, COLS,
2561 		    date_display_cols);
2562 		if (author_cols < width)
2563 			author_cols = width;
2564 		free(wauthor);
2565 		free(author);
2566 		if (err)
2567 			goto done;
2568 		err = got_object_commit_get_logmsg(&msg0, c);
2569 		if (err)
2570 			goto done;
2571 		msg = msg0;
2572 		while (*msg == '\n')
2573 			++msg;
2574 		if ((eol = strchr(msg, '\n')))
2575 			*eol = '\0';
2576 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2577 		    date_display_cols + author_cols, 0);
2578 		if (err)
2579 			goto done;
2580 		view->maxx = MAX(view->maxx, width);
2581 		free(msg0);
2582 		free(wmsg);
2583 		ncommits++;
2584 		entry = TAILQ_NEXT(entry, entry);
2585 	}
2586 
2587 	entry = s->first_displayed_entry;
2588 	s->last_displayed_entry = s->first_displayed_entry;
2589 	ncommits = 0;
2590 	while (entry) {
2591 		if (ncommits >= limit - 1)
2592 			break;
2593 		if (ncommits == s->selected)
2594 			wstandout(view->window);
2595 		err = draw_commit(view, entry->commit, entry->id,
2596 		    date_display_cols, author_cols);
2597 		if (ncommits == s->selected)
2598 			wstandend(view->window);
2599 		if (err)
2600 			goto done;
2601 		ncommits++;
2602 		s->last_displayed_entry = entry;
2603 		entry = TAILQ_NEXT(entry, entry);
2604 	}
2605 
2606 	view_border(view);
2607 done:
2608 	free(id_str);
2609 	free(refs_str);
2610 	free(ncommits_str);
2611 	free(header);
2612 	return err;
2613 }
2614 
2615 static void
2616 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2617 {
2618 	struct commit_queue_entry *entry;
2619 	int nscrolled = 0;
2620 
2621 	entry = TAILQ_FIRST(&s->commits->head);
2622 	if (s->first_displayed_entry == entry)
2623 		return;
2624 
2625 	entry = s->first_displayed_entry;
2626 	while (entry && nscrolled < maxscroll) {
2627 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2628 		if (entry) {
2629 			s->first_displayed_entry = entry;
2630 			nscrolled++;
2631 		}
2632 	}
2633 }
2634 
2635 static const struct got_error *
2636 trigger_log_thread(struct tog_view *view, int wait)
2637 {
2638 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2639 	int errcode;
2640 
2641 	halfdelay(1); /* fast refresh while loading commits */
2642 
2643 	while (!ta->log_complete && !tog_thread_error &&
2644 	    (ta->commits_needed > 0 || ta->load_all)) {
2645 		/* Wake the log thread. */
2646 		errcode = pthread_cond_signal(&ta->need_commits);
2647 		if (errcode)
2648 			return got_error_set_errno(errcode,
2649 			    "pthread_cond_signal");
2650 
2651 		/*
2652 		 * The mutex will be released while the view loop waits
2653 		 * in wgetch(), at which time the log thread will run.
2654 		 */
2655 		if (!wait)
2656 			break;
2657 
2658 		/* Display progress update in log view. */
2659 		show_log_view(view);
2660 		update_panels();
2661 		doupdate();
2662 
2663 		/* Wait right here while next commit is being loaded. */
2664 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2665 		if (errcode)
2666 			return got_error_set_errno(errcode,
2667 			    "pthread_cond_wait");
2668 
2669 		/* Display progress update in log view. */
2670 		show_log_view(view);
2671 		update_panels();
2672 		doupdate();
2673 	}
2674 
2675 	return NULL;
2676 }
2677 
2678 static const struct got_error *
2679 request_log_commits(struct tog_view *view)
2680 {
2681 	struct tog_log_view_state	*state = &view->state.log;
2682 	const struct got_error		*err = NULL;
2683 
2684 	if (state->thread_args.log_complete)
2685 		return NULL;
2686 
2687 	state->thread_args.commits_needed += view->nscrolled;
2688 	err = trigger_log_thread(view, 1);
2689 	view->nscrolled = 0;
2690 
2691 	return err;
2692 }
2693 
2694 static const struct got_error *
2695 log_scroll_down(struct tog_view *view, int maxscroll)
2696 {
2697 	struct tog_log_view_state *s = &view->state.log;
2698 	const struct got_error *err = NULL;
2699 	struct commit_queue_entry *pentry;
2700 	int nscrolled = 0, ncommits_needed;
2701 
2702 	if (s->last_displayed_entry == NULL)
2703 		return NULL;
2704 
2705 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2706 	if (s->commits->ncommits < ncommits_needed &&
2707 	    !s->thread_args.log_complete) {
2708 		/*
2709 		 * Ask the log thread for required amount of commits.
2710 		 */
2711 		s->thread_args.commits_needed +=
2712 		    ncommits_needed - s->commits->ncommits;
2713 		err = trigger_log_thread(view, 1);
2714 		if (err)
2715 			return err;
2716 	}
2717 
2718 	do {
2719 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2720 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2721 			break;
2722 
2723 		s->last_displayed_entry = pentry ?
2724 		    pentry : s->last_displayed_entry;;
2725 
2726 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2727 		if (pentry == NULL)
2728 			break;
2729 		s->first_displayed_entry = pentry;
2730 	} while (++nscrolled < maxscroll);
2731 
2732 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2733 		view->nscrolled += nscrolled;
2734 	else
2735 		view->nscrolled = 0;
2736 
2737 	return err;
2738 }
2739 
2740 static const struct got_error *
2741 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2742     struct got_commit_object *commit, struct got_object_id *commit_id,
2743     struct tog_view *log_view, struct got_repository *repo)
2744 {
2745 	const struct got_error *err;
2746 	struct got_object_qid *parent_id;
2747 	struct tog_view *diff_view;
2748 
2749 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2750 	if (diff_view == NULL)
2751 		return got_error_from_errno("view_open");
2752 
2753 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2754 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2755 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2756 	if (err == NULL)
2757 		*new_view = diff_view;
2758 	return err;
2759 }
2760 
2761 static const struct got_error *
2762 tree_view_visit_subtree(struct tog_tree_view_state *s,
2763     struct got_tree_object *subtree)
2764 {
2765 	struct tog_parent_tree *parent;
2766 
2767 	parent = calloc(1, sizeof(*parent));
2768 	if (parent == NULL)
2769 		return got_error_from_errno("calloc");
2770 
2771 	parent->tree = s->tree;
2772 	parent->first_displayed_entry = s->first_displayed_entry;
2773 	parent->selected_entry = s->selected_entry;
2774 	parent->selected = s->selected;
2775 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2776 	s->tree = subtree;
2777 	s->selected = 0;
2778 	s->first_displayed_entry = NULL;
2779 	return NULL;
2780 }
2781 
2782 static const struct got_error *
2783 tree_view_walk_path(struct tog_tree_view_state *s,
2784     struct got_commit_object *commit, const char *path)
2785 {
2786 	const struct got_error *err = NULL;
2787 	struct got_tree_object *tree = NULL;
2788 	const char *p;
2789 	char *slash, *subpath = NULL;
2790 
2791 	/* Walk the path and open corresponding tree objects. */
2792 	p = path;
2793 	while (*p) {
2794 		struct got_tree_entry *te;
2795 		struct got_object_id *tree_id;
2796 		char *te_name;
2797 
2798 		while (p[0] == '/')
2799 			p++;
2800 
2801 		/* Ensure the correct subtree entry is selected. */
2802 		slash = strchr(p, '/');
2803 		if (slash == NULL)
2804 			te_name = strdup(p);
2805 		else
2806 			te_name = strndup(p, slash - p);
2807 		if (te_name == NULL) {
2808 			err = got_error_from_errno("strndup");
2809 			break;
2810 		}
2811 		te = got_object_tree_find_entry(s->tree, te_name);
2812 		if (te == NULL) {
2813 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2814 			free(te_name);
2815 			break;
2816 		}
2817 		free(te_name);
2818 		s->first_displayed_entry = s->selected_entry = te;
2819 
2820 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2821 			break; /* jump to this file's entry */
2822 
2823 		slash = strchr(p, '/');
2824 		if (slash)
2825 			subpath = strndup(path, slash - path);
2826 		else
2827 			subpath = strdup(path);
2828 		if (subpath == NULL) {
2829 			err = got_error_from_errno("strdup");
2830 			break;
2831 		}
2832 
2833 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2834 		    subpath);
2835 		if (err)
2836 			break;
2837 
2838 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2839 		free(tree_id);
2840 		if (err)
2841 			break;
2842 
2843 		err = tree_view_visit_subtree(s, tree);
2844 		if (err) {
2845 			got_object_tree_close(tree);
2846 			break;
2847 		}
2848 		if (slash == NULL)
2849 			break;
2850 		free(subpath);
2851 		subpath = NULL;
2852 		p = slash;
2853 	}
2854 
2855 	free(subpath);
2856 	return err;
2857 }
2858 
2859 static const struct got_error *
2860 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2861     struct commit_queue_entry *entry, const char *path,
2862     const char *head_ref_name, struct got_repository *repo)
2863 {
2864 	const struct got_error *err = NULL;
2865 	struct tog_tree_view_state *s;
2866 	struct tog_view *tree_view;
2867 
2868 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2869 	if (tree_view == NULL)
2870 		return got_error_from_errno("view_open");
2871 
2872 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2873 	if (err)
2874 		return err;
2875 	s = &tree_view->state.tree;
2876 
2877 	*new_view = tree_view;
2878 
2879 	if (got_path_is_root_dir(path))
2880 		return NULL;
2881 
2882 	return tree_view_walk_path(s, entry->commit, path);
2883 }
2884 
2885 static const struct got_error *
2886 block_signals_used_by_main_thread(void)
2887 {
2888 	sigset_t sigset;
2889 	int errcode;
2890 
2891 	if (sigemptyset(&sigset) == -1)
2892 		return got_error_from_errno("sigemptyset");
2893 
2894 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2895 	if (sigaddset(&sigset, SIGWINCH) == -1)
2896 		return got_error_from_errno("sigaddset");
2897 	if (sigaddset(&sigset, SIGCONT) == -1)
2898 		return got_error_from_errno("sigaddset");
2899 	if (sigaddset(&sigset, SIGINT) == -1)
2900 		return got_error_from_errno("sigaddset");
2901 	if (sigaddset(&sigset, SIGTERM) == -1)
2902 		return got_error_from_errno("sigaddset");
2903 
2904 	/* ncurses handles SIGTSTP */
2905 	if (sigaddset(&sigset, SIGTSTP) == -1)
2906 		return got_error_from_errno("sigaddset");
2907 
2908 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2909 	if (errcode)
2910 		return got_error_set_errno(errcode, "pthread_sigmask");
2911 
2912 	return NULL;
2913 }
2914 
2915 static void *
2916 log_thread(void *arg)
2917 {
2918 	const struct got_error *err = NULL;
2919 	int errcode = 0;
2920 	struct tog_log_thread_args *a = arg;
2921 	int done = 0;
2922 
2923 	/*
2924 	 * Sync startup with main thread such that we begin our
2925 	 * work once view_input() has released the mutex.
2926 	 */
2927 	errcode = pthread_mutex_lock(&tog_mutex);
2928 	if (errcode) {
2929 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2930 		return (void *)err;
2931 	}
2932 
2933 	err = block_signals_used_by_main_thread();
2934 	if (err) {
2935 		pthread_mutex_unlock(&tog_mutex);
2936 		goto done;
2937 	}
2938 
2939 	while (!done && !err && !tog_fatal_signal_received()) {
2940 		errcode = pthread_mutex_unlock(&tog_mutex);
2941 		if (errcode) {
2942 			err = got_error_set_errno(errcode,
2943 			    "pthread_mutex_unlock");
2944 			goto done;
2945 		}
2946 		err = queue_commits(a);
2947 		if (err) {
2948 			if (err->code != GOT_ERR_ITER_COMPLETED)
2949 				goto done;
2950 			err = NULL;
2951 			done = 1;
2952 		} else if (a->commits_needed > 0 && !a->load_all) {
2953 			if (*a->limiting) {
2954 				if (a->limit_match)
2955 					a->commits_needed--;
2956 			} else
2957 				a->commits_needed--;
2958 		}
2959 
2960 		errcode = pthread_mutex_lock(&tog_mutex);
2961 		if (errcode) {
2962 			err = got_error_set_errno(errcode,
2963 			    "pthread_mutex_lock");
2964 			goto done;
2965 		} else if (*a->quit)
2966 			done = 1;
2967 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2968 			*a->first_displayed_entry =
2969 			    TAILQ_FIRST(&a->limit_commits->head);
2970 			*a->selected_entry = *a->first_displayed_entry;
2971 		} else if (*a->first_displayed_entry == NULL) {
2972 			*a->first_displayed_entry =
2973 			    TAILQ_FIRST(&a->real_commits->head);
2974 			*a->selected_entry = *a->first_displayed_entry;
2975 		}
2976 
2977 		errcode = pthread_cond_signal(&a->commit_loaded);
2978 		if (errcode) {
2979 			err = got_error_set_errno(errcode,
2980 			    "pthread_cond_signal");
2981 			pthread_mutex_unlock(&tog_mutex);
2982 			goto done;
2983 		}
2984 
2985 		if (done)
2986 			a->commits_needed = 0;
2987 		else {
2988 			if (a->commits_needed == 0 && !a->load_all) {
2989 				errcode = pthread_cond_wait(&a->need_commits,
2990 				    &tog_mutex);
2991 				if (errcode) {
2992 					err = got_error_set_errno(errcode,
2993 					    "pthread_cond_wait");
2994 					pthread_mutex_unlock(&tog_mutex);
2995 					goto done;
2996 				}
2997 				if (*a->quit)
2998 					done = 1;
2999 			}
3000 		}
3001 	}
3002 	a->log_complete = 1;
3003 	errcode = pthread_mutex_unlock(&tog_mutex);
3004 	if (errcode)
3005 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3006 done:
3007 	if (err) {
3008 		tog_thread_error = 1;
3009 		pthread_cond_signal(&a->commit_loaded);
3010 	}
3011 	return (void *)err;
3012 }
3013 
3014 static const struct got_error *
3015 stop_log_thread(struct tog_log_view_state *s)
3016 {
3017 	const struct got_error *err = NULL, *thread_err = NULL;
3018 	int errcode;
3019 
3020 	if (s->thread) {
3021 		s->quit = 1;
3022 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3023 		if (errcode)
3024 			return got_error_set_errno(errcode,
3025 			    "pthread_cond_signal");
3026 		errcode = pthread_mutex_unlock(&tog_mutex);
3027 		if (errcode)
3028 			return got_error_set_errno(errcode,
3029 			    "pthread_mutex_unlock");
3030 		errcode = pthread_join(s->thread, (void **)&thread_err);
3031 		if (errcode)
3032 			return got_error_set_errno(errcode, "pthread_join");
3033 		errcode = pthread_mutex_lock(&tog_mutex);
3034 		if (errcode)
3035 			return got_error_set_errno(errcode,
3036 			    "pthread_mutex_lock");
3037 		s->thread = 0; //NULL;
3038 	}
3039 
3040 	if (s->thread_args.repo) {
3041 		err = got_repo_close(s->thread_args.repo);
3042 		s->thread_args.repo = NULL;
3043 	}
3044 
3045 	if (s->thread_args.pack_fds) {
3046 		const struct got_error *pack_err =
3047 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3048 		if (err == NULL)
3049 			err = pack_err;
3050 		s->thread_args.pack_fds = NULL;
3051 	}
3052 
3053 	if (s->thread_args.graph) {
3054 		got_commit_graph_close(s->thread_args.graph);
3055 		s->thread_args.graph = NULL;
3056 	}
3057 
3058 	return err ? err : thread_err;
3059 }
3060 
3061 static const struct got_error *
3062 close_log_view(struct tog_view *view)
3063 {
3064 	const struct got_error *err = NULL;
3065 	struct tog_log_view_state *s = &view->state.log;
3066 	int errcode;
3067 
3068 	err = stop_log_thread(s);
3069 
3070 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3071 	if (errcode && err == NULL)
3072 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3073 
3074 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3075 	if (errcode && err == NULL)
3076 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3077 
3078 	free_commits(&s->limit_commits);
3079 	free_commits(&s->real_commits);
3080 	free(s->in_repo_path);
3081 	s->in_repo_path = NULL;
3082 	free(s->start_id);
3083 	s->start_id = NULL;
3084 	free(s->head_ref_name);
3085 	s->head_ref_name = NULL;
3086 	return err;
3087 }
3088 
3089 /*
3090  * We use two queues to implement the limit feature: first consists of
3091  * commits matching the current limit_regex; second is the real queue
3092  * of all known commits (real_commits). When the user starts limiting,
3093  * we swap queues such that all movement and displaying functionality
3094  * works with very slight change.
3095  */
3096 static const struct got_error *
3097 limit_log_view(struct tog_view *view)
3098 {
3099 	struct tog_log_view_state *s = &view->state.log;
3100 	struct commit_queue_entry *entry;
3101 	struct tog_view	*v = view;
3102 	const struct got_error *err = NULL;
3103 	char pattern[1024];
3104 	int ret;
3105 
3106 	if (view_is_hsplit_top(view))
3107 		v = view->child;
3108 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3109 		v = view->parent;
3110 
3111 	/* Get the pattern */
3112 	wmove(v->window, v->nlines - 1, 0);
3113 	wclrtoeol(v->window);
3114 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3115 	nodelay(v->window, FALSE);
3116 	nocbreak();
3117 	echo();
3118 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3119 	cbreak();
3120 	noecho();
3121 	nodelay(v->window, TRUE);
3122 	if (ret == ERR)
3123 		return NULL;
3124 
3125 	if (*pattern == '\0') {
3126 		/*
3127 		 * Safety measure for the situation where the user
3128 		 * resets limit without previously limiting anything.
3129 		 */
3130 		if (!s->limit_view)
3131 			return NULL;
3132 
3133 		/*
3134 		 * User could have pressed Ctrl+L, which refreshed the
3135 		 * commit queues, it means we can't save previously
3136 		 * (before limit took place) displayed entries,
3137 		 * because they would point to already free'ed memory,
3138 		 * so we are forced to always select first entry of
3139 		 * the queue.
3140 		 */
3141 		s->commits = &s->real_commits;
3142 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3143 		s->selected_entry = s->first_displayed_entry;
3144 		s->selected = 0;
3145 		s->limit_view = 0;
3146 
3147 		return NULL;
3148 	}
3149 
3150 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3151 		return NULL;
3152 
3153 	s->limit_view = 1;
3154 
3155 	/* Clear the screen while loading limit view */
3156 	s->first_displayed_entry = NULL;
3157 	s->last_displayed_entry = NULL;
3158 	s->selected_entry = NULL;
3159 	s->commits = &s->limit_commits;
3160 
3161 	/* Prepare limit queue for new search */
3162 	free_commits(&s->limit_commits);
3163 	s->limit_commits.ncommits = 0;
3164 
3165 	/* First process commits, which are in queue already */
3166 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3167 		int have_match = 0;
3168 
3169 		err = match_commit(&have_match, entry->id,
3170 		    entry->commit, &s->limit_regex);
3171 		if (err)
3172 			return err;
3173 
3174 		if (have_match) {
3175 			struct commit_queue_entry *matched;
3176 
3177 			matched = alloc_commit_queue_entry(entry->commit,
3178 			    entry->id);
3179 			if (matched == NULL) {
3180 				err = got_error_from_errno(
3181 				    "alloc_commit_queue_entry");
3182 				break;
3183 			}
3184 			matched->commit = entry->commit;
3185 			got_object_commit_retain(entry->commit);
3186 
3187 			matched->idx = s->limit_commits.ncommits;
3188 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3189 			    matched, entry);
3190 			s->limit_commits.ncommits++;
3191 		}
3192 	}
3193 
3194 	/* Second process all the commits, until we fill the screen */
3195 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3196 	    !s->thread_args.log_complete) {
3197 		s->thread_args.commits_needed +=
3198 		    view->nlines - s->limit_commits.ncommits - 1;
3199 		err = trigger_log_thread(view, 1);
3200 		if (err)
3201 			return err;
3202 	}
3203 
3204 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3205 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3206 	s->selected = 0;
3207 
3208 	return NULL;
3209 }
3210 
3211 static const struct got_error *
3212 search_start_log_view(struct tog_view *view)
3213 {
3214 	struct tog_log_view_state *s = &view->state.log;
3215 
3216 	s->matched_entry = NULL;
3217 	s->search_entry = NULL;
3218 	return NULL;
3219 }
3220 
3221 static const struct got_error *
3222 search_next_log_view(struct tog_view *view)
3223 {
3224 	const struct got_error *err = NULL;
3225 	struct tog_log_view_state *s = &view->state.log;
3226 	struct commit_queue_entry *entry;
3227 
3228 	/* Display progress update in log view. */
3229 	show_log_view(view);
3230 	update_panels();
3231 	doupdate();
3232 
3233 	if (s->search_entry) {
3234 		int errcode, ch;
3235 		errcode = pthread_mutex_unlock(&tog_mutex);
3236 		if (errcode)
3237 			return got_error_set_errno(errcode,
3238 			    "pthread_mutex_unlock");
3239 		ch = wgetch(view->window);
3240 		errcode = pthread_mutex_lock(&tog_mutex);
3241 		if (errcode)
3242 			return got_error_set_errno(errcode,
3243 			    "pthread_mutex_lock");
3244 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3245 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3246 			return NULL;
3247 		}
3248 		if (view->searching == TOG_SEARCH_FORWARD)
3249 			entry = TAILQ_NEXT(s->search_entry, entry);
3250 		else
3251 			entry = TAILQ_PREV(s->search_entry,
3252 			    commit_queue_head, entry);
3253 	} else if (s->matched_entry) {
3254 		/*
3255 		 * If the user has moved the cursor after we hit a match,
3256 		 * the position from where we should continue searching
3257 		 * might have changed.
3258 		 */
3259 		if (view->searching == TOG_SEARCH_FORWARD)
3260 			entry = TAILQ_NEXT(s->selected_entry, entry);
3261 		else
3262 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3263 			    entry);
3264 	} else {
3265 		entry = s->selected_entry;
3266 	}
3267 
3268 	while (1) {
3269 		int have_match = 0;
3270 
3271 		if (entry == NULL) {
3272 			if (s->thread_args.log_complete ||
3273 			    view->searching == TOG_SEARCH_BACKWARD) {
3274 				view->search_next_done =
3275 				    (s->matched_entry == NULL ?
3276 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3277 				s->search_entry = NULL;
3278 				return NULL;
3279 			}
3280 			/*
3281 			 * Poke the log thread for more commits and return,
3282 			 * allowing the main loop to make progress. Search
3283 			 * will resume at s->search_entry once we come back.
3284 			 */
3285 			s->thread_args.commits_needed++;
3286 			return trigger_log_thread(view, 0);
3287 		}
3288 
3289 		err = match_commit(&have_match, entry->id, entry->commit,
3290 		    &view->regex);
3291 		if (err)
3292 			break;
3293 		if (have_match) {
3294 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3295 			s->matched_entry = entry;
3296 			break;
3297 		}
3298 
3299 		s->search_entry = entry;
3300 		if (view->searching == TOG_SEARCH_FORWARD)
3301 			entry = TAILQ_NEXT(entry, entry);
3302 		else
3303 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3304 	}
3305 
3306 	if (s->matched_entry) {
3307 		int cur = s->selected_entry->idx;
3308 		while (cur < s->matched_entry->idx) {
3309 			err = input_log_view(NULL, view, KEY_DOWN);
3310 			if (err)
3311 				return err;
3312 			cur++;
3313 		}
3314 		while (cur > s->matched_entry->idx) {
3315 			err = input_log_view(NULL, view, KEY_UP);
3316 			if (err)
3317 				return err;
3318 			cur--;
3319 		}
3320 	}
3321 
3322 	s->search_entry = NULL;
3323 
3324 	return NULL;
3325 }
3326 
3327 static const struct got_error *
3328 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3329     struct got_repository *repo, const char *head_ref_name,
3330     const char *in_repo_path, int log_branches)
3331 {
3332 	const struct got_error *err = NULL;
3333 	struct tog_log_view_state *s = &view->state.log;
3334 	struct got_repository *thread_repo = NULL;
3335 	struct got_commit_graph *thread_graph = NULL;
3336 	int errcode;
3337 
3338 	if (in_repo_path != s->in_repo_path) {
3339 		free(s->in_repo_path);
3340 		s->in_repo_path = strdup(in_repo_path);
3341 		if (s->in_repo_path == NULL)
3342 			return got_error_from_errno("strdup");
3343 	}
3344 
3345 	/* The commit queue only contains commits being displayed. */
3346 	TAILQ_INIT(&s->real_commits.head);
3347 	s->real_commits.ncommits = 0;
3348 	s->commits = &s->real_commits;
3349 
3350 	TAILQ_INIT(&s->limit_commits.head);
3351 	s->limit_view = 0;
3352 	s->limit_commits.ncommits = 0;
3353 
3354 	s->repo = repo;
3355 	if (head_ref_name) {
3356 		s->head_ref_name = strdup(head_ref_name);
3357 		if (s->head_ref_name == NULL) {
3358 			err = got_error_from_errno("strdup");
3359 			goto done;
3360 		}
3361 	}
3362 	s->start_id = got_object_id_dup(start_id);
3363 	if (s->start_id == NULL) {
3364 		err = got_error_from_errno("got_object_id_dup");
3365 		goto done;
3366 	}
3367 	s->log_branches = log_branches;
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 == 0) { //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 KEY_HOME:
3699 		log_move_cursor_up(view, 0, 1);
3700 		view->count = 0;
3701 		break;
3702 	case CTRL('u'):
3703 	case 'u':
3704 		nscroll /= 2;
3705 		/* FALL THROUGH */
3706 	case KEY_PPAGE:
3707 	case CTRL('b'):
3708 	case 'b':
3709 		log_move_cursor_up(view, nscroll, 0);
3710 		break;
3711 	case 'j':
3712 	case KEY_DOWN:
3713 	case '>':
3714 	case '.':
3715 	case CTRL('n'):
3716 		err = log_move_cursor_down(view, 0);
3717 		break;
3718 	case '@':
3719 		s->use_committer = !s->use_committer;
3720 		break;
3721 	case 'G':
3722 	case KEY_END: {
3723 		/* We don't know yet how many commits, so we're forced to
3724 		 * traverse them all. */
3725 		view->count = 0;
3726 		s->thread_args.load_all = 1;
3727 		if (!s->thread_args.log_complete)
3728 			return trigger_log_thread(view, 0);
3729 		err = log_move_cursor_down(view, s->commits->ncommits);
3730 		s->thread_args.load_all = 0;
3731 		break;
3732 	}
3733 	case CTRL('d'):
3734 	case 'd':
3735 		nscroll /= 2;
3736 		/* FALL THROUGH */
3737 	case KEY_NPAGE:
3738 	case CTRL('f'):
3739 	case 'f':
3740 	case ' ':
3741 		err = log_move_cursor_down(view, nscroll);
3742 		break;
3743 	case KEY_RESIZE:
3744 		if (s->selected > view->nlines - 2)
3745 			s->selected = view->nlines - 2;
3746 		if (s->selected > s->commits->ncommits - 1)
3747 			s->selected = s->commits->ncommits - 1;
3748 		select_commit(s);
3749 		if (s->commits->ncommits < view->nlines - 1 &&
3750 		    !s->thread_args.log_complete) {
3751 			s->thread_args.commits_needed += (view->nlines - 1) -
3752 			    s->commits->ncommits;
3753 			err = trigger_log_thread(view, 1);
3754 		}
3755 		break;
3756 	case KEY_ENTER:
3757 	case '\r':
3758 		view->count = 0;
3759 		if (s->selected_entry == NULL)
3760 			break;
3761 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3762 		break;
3763 	case 'T':
3764 		view->count = 0;
3765 		if (s->selected_entry == NULL)
3766 			break;
3767 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3768 		break;
3769 	case KEY_BACKSPACE:
3770 	case CTRL('l'):
3771 	case 'B':
3772 		view->count = 0;
3773 		if (ch == KEY_BACKSPACE &&
3774 		    got_path_is_root_dir(s->in_repo_path))
3775 			break;
3776 		err = stop_log_thread(s);
3777 		if (err)
3778 			return err;
3779 		if (ch == KEY_BACKSPACE) {
3780 			char *parent_path;
3781 			err = got_path_dirname(&parent_path, s->in_repo_path);
3782 			if (err)
3783 				return err;
3784 			free(s->in_repo_path);
3785 			s->in_repo_path = parent_path;
3786 			s->thread_args.in_repo_path = s->in_repo_path;
3787 		} else if (ch == CTRL('l')) {
3788 			struct got_object_id *start_id;
3789 			err = got_repo_match_object_id(&start_id, NULL,
3790 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3791 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3792 			if (err)
3793 				return err;
3794 			free(s->start_id);
3795 			s->start_id = start_id;
3796 			s->thread_args.start_id = s->start_id;
3797 		} else /* 'B' */
3798 			s->log_branches = !s->log_branches;
3799 
3800 		if (s->thread_args.pack_fds == NULL) {
3801 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3802 			if (err)
3803 				return err;
3804 		}
3805 		err = got_repo_open(&s->thread_args.repo,
3806 		    got_repo_get_path(s->repo), NULL,
3807 		    s->thread_args.pack_fds);
3808 		if (err)
3809 			return err;
3810 		tog_free_refs();
3811 		err = tog_load_refs(s->repo, 0);
3812 		if (err)
3813 			return err;
3814 		err = got_commit_graph_open(&s->thread_args.graph,
3815 		    s->in_repo_path, !s->log_branches);
3816 		if (err)
3817 			return err;
3818 		err = got_commit_graph_iter_start(s->thread_args.graph,
3819 		    s->start_id, s->repo, NULL, NULL);
3820 		if (err)
3821 			return err;
3822 		free_commits(&s->real_commits);
3823 		free_commits(&s->limit_commits);
3824 		s->first_displayed_entry = NULL;
3825 		s->last_displayed_entry = NULL;
3826 		s->selected_entry = NULL;
3827 		s->selected = 0;
3828 		s->thread_args.log_complete = 0;
3829 		s->quit = 0;
3830 		s->thread_args.commits_needed = view->lines;
3831 		s->matched_entry = NULL;
3832 		s->search_entry = NULL;
3833 		view->offset = 0;
3834 		break;
3835 	case 'R':
3836 		view->count = 0;
3837 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3838 		break;
3839 	default:
3840 		view->count = 0;
3841 		break;
3842 	}
3843 
3844 	return err;
3845 }
3846 
3847 static const struct got_error *
3848 apply_unveil(const char *repo_path, const char *worktree_path)
3849 {
3850 	const struct got_error *error;
3851 
3852 #ifdef PROFILE
3853 	if (unveil("gmon.out", "rwc") != 0)
3854 		return got_error_from_errno2("unveil", "gmon.out");
3855 #endif
3856 	if (repo_path && unveil(repo_path, "r") != 0)
3857 		return got_error_from_errno2("unveil", repo_path);
3858 
3859 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3860 		return got_error_from_errno2("unveil", worktree_path);
3861 
3862 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3863 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3864 
3865 	error = got_privsep_unveil_exec_helpers();
3866 	if (error != NULL)
3867 		return error;
3868 
3869 	if (unveil(NULL, NULL) != 0)
3870 		return got_error_from_errno("unveil");
3871 
3872 	return NULL;
3873 }
3874 
3875 static void
3876 init_curses(void)
3877 {
3878 	/*
3879 	 * Override default signal handlers before starting ncurses.
3880 	 * This should prevent ncurses from installing its own
3881 	 * broken cleanup() signal handler.
3882 	 */
3883 	signal(SIGWINCH, tog_sigwinch);
3884 	signal(SIGPIPE, tog_sigpipe);
3885 	signal(SIGCONT, tog_sigcont);
3886 	signal(SIGINT, tog_sigint);
3887 	signal(SIGTERM, tog_sigterm);
3888 
3889 	initscr();
3890 	cbreak();
3891 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3892 	noecho();
3893 	nonl();
3894 	intrflush(stdscr, FALSE);
3895 	keypad(stdscr, TRUE);
3896 	curs_set(0);
3897 	if (getenv("TOG_COLORS") != NULL) {
3898 		start_color();
3899 		use_default_colors();
3900 	}
3901 }
3902 
3903 static const struct got_error *
3904 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3905     struct got_repository *repo, struct got_worktree *worktree)
3906 {
3907 	const struct got_error *err = NULL;
3908 
3909 	if (argc == 0) {
3910 		*in_repo_path = strdup("/");
3911 		if (*in_repo_path == NULL)
3912 			return got_error_from_errno("strdup");
3913 		return NULL;
3914 	}
3915 
3916 	if (worktree) {
3917 		const char *prefix = got_worktree_get_path_prefix(worktree);
3918 		char *p;
3919 
3920 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3921 		if (err)
3922 			return err;
3923 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3924 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3925 		    p) == -1) {
3926 			err = got_error_from_errno("asprintf");
3927 			*in_repo_path = NULL;
3928 		}
3929 		free(p);
3930 	} else
3931 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3932 
3933 	return err;
3934 }
3935 
3936 static const struct got_error *
3937 cmd_log(int argc, char *argv[])
3938 {
3939 	const struct got_error *error;
3940 	struct got_repository *repo = NULL;
3941 	struct got_worktree *worktree = NULL;
3942 	struct got_object_id *start_id = NULL;
3943 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3944 	char *start_commit = NULL, *label = NULL;
3945 	struct got_reference *ref = NULL;
3946 	const char *head_ref_name = NULL;
3947 	int ch, log_branches = 0;
3948 	struct tog_view *view;
3949 	int *pack_fds = NULL;
3950 
3951 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3952 		switch (ch) {
3953 		case 'b':
3954 			log_branches = 1;
3955 			break;
3956 		case 'c':
3957 			start_commit = optarg;
3958 			break;
3959 		case 'r':
3960 			repo_path = realpath(optarg, NULL);
3961 			if (repo_path == NULL)
3962 				return got_error_from_errno2("realpath",
3963 				    optarg);
3964 			break;
3965 		default:
3966 			usage_log();
3967 			/* NOTREACHED */
3968 		}
3969 	}
3970 
3971 	argc -= optind;
3972 	argv += optind;
3973 
3974 	if (argc > 1)
3975 		usage_log();
3976 
3977 	error = got_repo_pack_fds_open(&pack_fds);
3978 	if (error != NULL)
3979 		goto done;
3980 
3981 	if (repo_path == NULL) {
3982 		cwd = getcwd(NULL, 0);
3983 		if (cwd == NULL)
3984 			return got_error_from_errno("getcwd");
3985 		error = got_worktree_open(&worktree, cwd);
3986 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3987 			goto done;
3988 		if (worktree)
3989 			repo_path =
3990 			    strdup(got_worktree_get_repo_path(worktree));
3991 		else
3992 			repo_path = strdup(cwd);
3993 		if (repo_path == NULL) {
3994 			error = got_error_from_errno("strdup");
3995 			goto done;
3996 		}
3997 	}
3998 
3999 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4000 	if (error != NULL)
4001 		goto done;
4002 
4003 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4004 	    repo, worktree);
4005 	if (error)
4006 		goto done;
4007 
4008 	init_curses();
4009 
4010 	error = apply_unveil(got_repo_get_path(repo),
4011 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4012 	if (error)
4013 		goto done;
4014 
4015 	/* already loaded by tog_log_with_path()? */
4016 	if (TAILQ_EMPTY(&tog_refs)) {
4017 		error = tog_load_refs(repo, 0);
4018 		if (error)
4019 			goto done;
4020 	}
4021 
4022 	if (start_commit == NULL) {
4023 		error = got_repo_match_object_id(&start_id, &label,
4024 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4025 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4026 		if (error)
4027 			goto done;
4028 		head_ref_name = label;
4029 	} else {
4030 		error = got_ref_open(&ref, repo, start_commit, 0);
4031 		if (error == NULL)
4032 			head_ref_name = got_ref_get_name(ref);
4033 		else if (error->code != GOT_ERR_NOT_REF)
4034 			goto done;
4035 		error = got_repo_match_object_id(&start_id, NULL,
4036 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4037 		if (error)
4038 			goto done;
4039 	}
4040 
4041 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4042 	if (view == NULL) {
4043 		error = got_error_from_errno("view_open");
4044 		goto done;
4045 	}
4046 	error = open_log_view(view, start_id, repo, head_ref_name,
4047 	    in_repo_path, log_branches);
4048 	if (error)
4049 		goto done;
4050 	if (worktree) {
4051 		/* Release work tree lock. */
4052 		got_worktree_close(worktree);
4053 		worktree = NULL;
4054 	}
4055 	error = view_loop(view);
4056 done:
4057 	free(in_repo_path);
4058 	free(repo_path);
4059 	free(cwd);
4060 	free(start_id);
4061 	free(label);
4062 	if (ref)
4063 		got_ref_close(ref);
4064 	if (repo) {
4065 		const struct got_error *close_err = got_repo_close(repo);
4066 		if (error == NULL)
4067 			error = close_err;
4068 	}
4069 	if (worktree)
4070 		got_worktree_close(worktree);
4071 	if (pack_fds) {
4072 		const struct got_error *pack_err =
4073 		    got_repo_pack_fds_close(pack_fds);
4074 		if (error == NULL)
4075 			error = pack_err;
4076 	}
4077 	tog_free_refs();
4078 	return error;
4079 }
4080 
4081 __dead static void
4082 usage_diff(void)
4083 {
4084 	endwin();
4085 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4086 	    "object1 object2\n", getprogname());
4087 	exit(1);
4088 }
4089 
4090 static int
4091 match_line(const char *line, regex_t *regex, size_t nmatch,
4092     regmatch_t *regmatch)
4093 {
4094 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4095 }
4096 
4097 static struct tog_color *
4098 match_color(struct tog_colors *colors, const char *line)
4099 {
4100 	struct tog_color *tc = NULL;
4101 
4102 	STAILQ_FOREACH(tc, colors, entry) {
4103 		if (match_line(line, &tc->regex, 0, NULL))
4104 			return tc;
4105 	}
4106 
4107 	return NULL;
4108 }
4109 
4110 static const struct got_error *
4111 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4112     WINDOW *window, int skipcol, regmatch_t *regmatch)
4113 {
4114 	const struct got_error *err = NULL;
4115 	char *exstr = NULL;
4116 	wchar_t *wline = NULL;
4117 	int rme, rms, n, width, scrollx;
4118 	int width0 = 0, width1 = 0, width2 = 0;
4119 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4120 
4121 	*wtotal = 0;
4122 
4123 	rms = regmatch->rm_so;
4124 	rme = regmatch->rm_eo;
4125 
4126 	err = expand_tab(&exstr, line);
4127 	if (err)
4128 		return err;
4129 
4130 	/* Split the line into 3 segments, according to match offsets. */
4131 	seg0 = strndup(exstr, rms);
4132 	if (seg0 == NULL) {
4133 		err = got_error_from_errno("strndup");
4134 		goto done;
4135 	}
4136 	seg1 = strndup(exstr + rms, rme - rms);
4137 	if (seg1 == NULL) {
4138 		err = got_error_from_errno("strndup");
4139 		goto done;
4140 	}
4141 	seg2 = strdup(exstr + rme);
4142 	if (seg2 == NULL) {
4143 		err = got_error_from_errno("strndup");
4144 		goto done;
4145 	}
4146 
4147 	/* draw up to matched token if we haven't scrolled past it */
4148 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4149 	    col_tab_align, 1);
4150 	if (err)
4151 		goto done;
4152 	n = MAX(width0 - skipcol, 0);
4153 	if (n) {
4154 		free(wline);
4155 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4156 		    wlimit, col_tab_align, 1);
4157 		if (err)
4158 			goto done;
4159 		waddwstr(window, &wline[scrollx]);
4160 		wlimit -= width;
4161 		*wtotal += width;
4162 	}
4163 
4164 	if (wlimit > 0) {
4165 		int i = 0, w = 0;
4166 		size_t wlen;
4167 
4168 		free(wline);
4169 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4170 		    col_tab_align, 1);
4171 		if (err)
4172 			goto done;
4173 		wlen = wcslen(wline);
4174 		while (i < wlen) {
4175 			width = wcwidth(wline[i]);
4176 			if (width == -1) {
4177 				/* should not happen, tabs are expanded */
4178 				err = got_error(GOT_ERR_RANGE);
4179 				goto done;
4180 			}
4181 			if (width0 + w + width > skipcol)
4182 				break;
4183 			w += width;
4184 			i++;
4185 		}
4186 		/* draw (visible part of) matched token (if scrolled into it) */
4187 		if (width1 - w > 0) {
4188 			wattron(window, A_STANDOUT);
4189 			waddwstr(window, &wline[i]);
4190 			wattroff(window, A_STANDOUT);
4191 			wlimit -= (width1 - w);
4192 			*wtotal += (width1 - w);
4193 		}
4194 	}
4195 
4196 	if (wlimit > 0) {  /* draw rest of line */
4197 		free(wline);
4198 		if (skipcol > width0 + width1) {
4199 			err = format_line(&wline, &width2, &scrollx, seg2,
4200 			    skipcol - (width0 + width1), wlimit,
4201 			    col_tab_align, 1);
4202 			if (err)
4203 				goto done;
4204 			waddwstr(window, &wline[scrollx]);
4205 		} else {
4206 			err = format_line(&wline, &width2, NULL, seg2, 0,
4207 			    wlimit, col_tab_align, 1);
4208 			if (err)
4209 				goto done;
4210 			waddwstr(window, wline);
4211 		}
4212 		*wtotal += width2;
4213 	}
4214 done:
4215 	free(wline);
4216 	free(exstr);
4217 	free(seg0);
4218 	free(seg1);
4219 	free(seg2);
4220 	return err;
4221 }
4222 
4223 static int
4224 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4225 {
4226 	FILE	*f = NULL;
4227 	int	*eof, *first, *selected;
4228 
4229 	if (view->type == TOG_VIEW_DIFF) {
4230 		struct tog_diff_view_state *s = &view->state.diff;
4231 
4232 		first = &s->first_displayed_line;
4233 		selected = first;
4234 		eof = &s->eof;
4235 		f = s->f;
4236 	} else if (view->type == TOG_VIEW_HELP) {
4237 		struct tog_help_view_state *s = &view->state.help;
4238 
4239 		first = &s->first_displayed_line;
4240 		selected = first;
4241 		eof = &s->eof;
4242 		f = s->f;
4243 	} else if (view->type == TOG_VIEW_BLAME) {
4244 		struct tog_blame_view_state *s = &view->state.blame;
4245 
4246 		first = &s->first_displayed_line;
4247 		selected = &s->selected_line;
4248 		eof = &s->eof;
4249 		f = s->blame.f;
4250 	} else
4251 		return 0;
4252 
4253 	/* Center gline in the middle of the page like vi(1). */
4254 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4255 		return 0;
4256 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4257 		rewind(f);
4258 		*eof = 0;
4259 		*first = 1;
4260 		*lineno = 0;
4261 		*nprinted = 0;
4262 		return 0;
4263 	}
4264 
4265 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4266 		view->gline : (view->nlines - 3) / 2 + 1;
4267 	view->gline = 0;
4268 
4269 	return 1;
4270 }
4271 
4272 static const struct got_error *
4273 draw_file(struct tog_view *view, const char *header)
4274 {
4275 	struct tog_diff_view_state *s = &view->state.diff;
4276 	regmatch_t *regmatch = &view->regmatch;
4277 	const struct got_error *err;
4278 	int nprinted = 0;
4279 	char *line;
4280 	size_t linesize = 0;
4281 	ssize_t linelen;
4282 	wchar_t *wline;
4283 	int width;
4284 	int max_lines = view->nlines;
4285 	int nlines = s->nlines;
4286 	off_t line_offset;
4287 
4288 	s->lineno = s->first_displayed_line - 1;
4289 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4290 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4291 		return got_error_from_errno("fseek");
4292 
4293 	werase(view->window);
4294 
4295 	if (view->gline > s->nlines - 1)
4296 		view->gline = s->nlines - 1;
4297 
4298 	if (header) {
4299 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4300 		    1 : view->gline - (view->nlines - 3) / 2 :
4301 		    s->lineno + s->selected_line;
4302 
4303 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4304 			return got_error_from_errno("asprintf");
4305 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4306 		    0, 0);
4307 		free(line);
4308 		if (err)
4309 			return err;
4310 
4311 		if (view_needs_focus_indication(view))
4312 			wstandout(view->window);
4313 		waddwstr(view->window, wline);
4314 		free(wline);
4315 		wline = NULL;
4316 		while (width++ < view->ncols)
4317 			waddch(view->window, ' ');
4318 		if (view_needs_focus_indication(view))
4319 			wstandend(view->window);
4320 
4321 		if (max_lines <= 1)
4322 			return NULL;
4323 		max_lines--;
4324 	}
4325 
4326 	s->eof = 0;
4327 	view->maxx = 0;
4328 	line = NULL;
4329 	while (max_lines > 0 && nprinted < max_lines) {
4330 		enum got_diff_line_type linetype;
4331 		attr_t attr = 0;
4332 
4333 		linelen = getline(&line, &linesize, s->f);
4334 		if (linelen == -1) {
4335 			if (feof(s->f)) {
4336 				s->eof = 1;
4337 				break;
4338 			}
4339 			free(line);
4340 			return got_ferror(s->f, GOT_ERR_IO);
4341 		}
4342 
4343 		if (++s->lineno < s->first_displayed_line)
4344 			continue;
4345 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4346 			continue;
4347 		if (s->lineno == view->hiline)
4348 			attr = A_STANDOUT;
4349 
4350 		/* Set view->maxx based on full line length. */
4351 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4352 		    view->x ? 1 : 0);
4353 		if (err) {
4354 			free(line);
4355 			return err;
4356 		}
4357 		view->maxx = MAX(view->maxx, width);
4358 		free(wline);
4359 		wline = NULL;
4360 
4361 		linetype = s->lines[s->lineno].type;
4362 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4363 		    linetype < GOT_DIFF_LINE_CONTEXT)
4364 			attr |= COLOR_PAIR(linetype);
4365 		if (attr)
4366 			wattron(view->window, attr);
4367 		if (s->first_displayed_line + nprinted == s->matched_line &&
4368 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4369 			err = add_matched_line(&width, line, view->ncols, 0,
4370 			    view->window, view->x, regmatch);
4371 			if (err) {
4372 				free(line);
4373 				return err;
4374 			}
4375 		} else {
4376 			int skip;
4377 			err = format_line(&wline, &width, &skip, line,
4378 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4379 			if (err) {
4380 				free(line);
4381 				return err;
4382 			}
4383 			waddwstr(view->window, &wline[skip]);
4384 			free(wline);
4385 			wline = NULL;
4386 		}
4387 		if (s->lineno == view->hiline) {
4388 			/* highlight full gline length */
4389 			while (width++ < view->ncols)
4390 				waddch(view->window, ' ');
4391 		} else {
4392 			if (width <= view->ncols - 1)
4393 				waddch(view->window, '\n');
4394 		}
4395 		if (attr)
4396 			wattroff(view->window, attr);
4397 		if (++nprinted == 1)
4398 			s->first_displayed_line = s->lineno;
4399 	}
4400 	free(line);
4401 	if (nprinted >= 1)
4402 		s->last_displayed_line = s->first_displayed_line +
4403 		    (nprinted - 1);
4404 	else
4405 		s->last_displayed_line = s->first_displayed_line;
4406 
4407 	view_border(view);
4408 
4409 	if (s->eof) {
4410 		while (nprinted < view->nlines) {
4411 			waddch(view->window, '\n');
4412 			nprinted++;
4413 		}
4414 
4415 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4416 		    view->ncols, 0, 0);
4417 		if (err) {
4418 			return err;
4419 		}
4420 
4421 		wstandout(view->window);
4422 		waddwstr(view->window, wline);
4423 		free(wline);
4424 		wline = NULL;
4425 		wstandend(view->window);
4426 	}
4427 
4428 	return NULL;
4429 }
4430 
4431 static char *
4432 get_datestr(time_t *time, char *datebuf)
4433 {
4434 	struct tm mytm, *tm;
4435 	char *p, *s;
4436 
4437 	tm = gmtime_r(time, &mytm);
4438 	if (tm == NULL)
4439 		return NULL;
4440 	s = asctime_r(tm, datebuf);
4441 	if (s == NULL)
4442 		return NULL;
4443 	p = strchr(s, '\n');
4444 	if (p)
4445 		*p = '\0';
4446 	return s;
4447 }
4448 
4449 static const struct got_error *
4450 get_changed_paths(struct got_pathlist_head *paths,
4451     struct got_commit_object *commit, struct got_repository *repo)
4452 {
4453 	const struct got_error *err = NULL;
4454 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4455 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4456 	struct got_object_qid *qid;
4457 
4458 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4459 	if (qid != NULL) {
4460 		struct got_commit_object *pcommit;
4461 		err = got_object_open_as_commit(&pcommit, repo,
4462 		    &qid->id);
4463 		if (err)
4464 			return err;
4465 
4466 		tree_id1 = got_object_id_dup(
4467 		    got_object_commit_get_tree_id(pcommit));
4468 		if (tree_id1 == NULL) {
4469 			got_object_commit_close(pcommit);
4470 			return got_error_from_errno("got_object_id_dup");
4471 		}
4472 		got_object_commit_close(pcommit);
4473 
4474 	}
4475 
4476 	if (tree_id1) {
4477 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4478 		if (err)
4479 			goto done;
4480 	}
4481 
4482 	tree_id2 = got_object_commit_get_tree_id(commit);
4483 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4484 	if (err)
4485 		goto done;
4486 
4487 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4488 	    got_diff_tree_collect_changed_paths, paths, 0);
4489 done:
4490 	if (tree1)
4491 		got_object_tree_close(tree1);
4492 	if (tree2)
4493 		got_object_tree_close(tree2);
4494 	free(tree_id1);
4495 	return err;
4496 }
4497 
4498 static const struct got_error *
4499 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4500     off_t off, uint8_t type)
4501 {
4502 	struct got_diff_line *p;
4503 
4504 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4505 	if (p == NULL)
4506 		return got_error_from_errno("reallocarray");
4507 	*lines = p;
4508 	(*lines)[*nlines].offset = off;
4509 	(*lines)[*nlines].type = type;
4510 	(*nlines)++;
4511 
4512 	return NULL;
4513 }
4514 
4515 static const struct got_error *
4516 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4517     struct got_object_id *commit_id, struct got_reflist_head *refs,
4518     struct got_repository *repo, FILE *outfile)
4519 {
4520 	const struct got_error *err = NULL;
4521 	char datebuf[26], *datestr;
4522 	struct got_commit_object *commit;
4523 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4524 	time_t committer_time;
4525 	const char *author, *committer;
4526 	char *refs_str = NULL;
4527 	struct got_pathlist_head changed_paths;
4528 	struct got_pathlist_entry *pe;
4529 	off_t outoff = 0;
4530 	int n;
4531 
4532 	TAILQ_INIT(&changed_paths);
4533 
4534 	if (refs) {
4535 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4536 		if (err)
4537 			return err;
4538 	}
4539 
4540 	err = got_object_open_as_commit(&commit, repo, commit_id);
4541 	if (err)
4542 		return err;
4543 
4544 	err = got_object_id_str(&id_str, commit_id);
4545 	if (err) {
4546 		err = got_error_from_errno("got_object_id_str");
4547 		goto done;
4548 	}
4549 
4550 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4551 	if (err)
4552 		goto done;
4553 
4554 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4555 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4556 	if (n < 0) {
4557 		err = got_error_from_errno("fprintf");
4558 		goto done;
4559 	}
4560 	outoff += n;
4561 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4562 	if (err)
4563 		goto done;
4564 
4565 	n = fprintf(outfile, "from: %s\n",
4566 	    got_object_commit_get_author(commit));
4567 	if (n < 0) {
4568 		err = got_error_from_errno("fprintf");
4569 		goto done;
4570 	}
4571 	outoff += n;
4572 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4573 	if (err)
4574 		goto done;
4575 
4576 	committer_time = got_object_commit_get_committer_time(commit);
4577 	datestr = get_datestr(&committer_time, datebuf);
4578 	if (datestr) {
4579 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4580 		if (n < 0) {
4581 			err = got_error_from_errno("fprintf");
4582 			goto done;
4583 		}
4584 		outoff += n;
4585 		err = add_line_metadata(lines, nlines, outoff,
4586 		    GOT_DIFF_LINE_DATE);
4587 		if (err)
4588 			goto done;
4589 	}
4590 	author = got_object_commit_get_author(commit);
4591 	committer = got_object_commit_get_committer(commit);
4592 	if (strcmp(author, committer) != 0) {
4593 		n = fprintf(outfile, "via: %s\n", committer);
4594 		if (n < 0) {
4595 			err = got_error_from_errno("fprintf");
4596 			goto done;
4597 		}
4598 		outoff += n;
4599 		err = add_line_metadata(lines, nlines, outoff,
4600 		    GOT_DIFF_LINE_AUTHOR);
4601 		if (err)
4602 			goto done;
4603 	}
4604 	if (got_object_commit_get_nparents(commit) > 1) {
4605 		const struct got_object_id_queue *parent_ids;
4606 		struct got_object_qid *qid;
4607 		int pn = 1;
4608 		parent_ids = got_object_commit_get_parent_ids(commit);
4609 		STAILQ_FOREACH(qid, parent_ids, entry) {
4610 			err = got_object_id_str(&id_str, &qid->id);
4611 			if (err)
4612 				goto done;
4613 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4614 			if (n < 0) {
4615 				err = got_error_from_errno("fprintf");
4616 				goto done;
4617 			}
4618 			outoff += n;
4619 			err = add_line_metadata(lines, nlines, outoff,
4620 			    GOT_DIFF_LINE_META);
4621 			if (err)
4622 				goto done;
4623 			free(id_str);
4624 			id_str = NULL;
4625 		}
4626 	}
4627 
4628 	err = got_object_commit_get_logmsg(&logmsg, commit);
4629 	if (err)
4630 		goto done;
4631 	s = logmsg;
4632 	while ((line = strsep(&s, "\n")) != NULL) {
4633 		n = fprintf(outfile, "%s\n", line);
4634 		if (n < 0) {
4635 			err = got_error_from_errno("fprintf");
4636 			goto done;
4637 		}
4638 		outoff += n;
4639 		err = add_line_metadata(lines, nlines, outoff,
4640 		    GOT_DIFF_LINE_LOGMSG);
4641 		if (err)
4642 			goto done;
4643 	}
4644 
4645 	err = get_changed_paths(&changed_paths, commit, repo);
4646 	if (err)
4647 		goto done;
4648 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4649 		struct got_diff_changed_path *cp = pe->data;
4650 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4651 		if (n < 0) {
4652 			err = got_error_from_errno("fprintf");
4653 			goto done;
4654 		}
4655 		outoff += n;
4656 		err = add_line_metadata(lines, nlines, outoff,
4657 		    GOT_DIFF_LINE_CHANGES);
4658 		if (err)
4659 			goto done;
4660 		free((char *)pe->path);
4661 		free(pe->data);
4662 	}
4663 
4664 	fputc('\n', outfile);
4665 	outoff++;
4666 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4667 done:
4668 	got_pathlist_free(&changed_paths);
4669 	free(id_str);
4670 	free(logmsg);
4671 	free(refs_str);
4672 	got_object_commit_close(commit);
4673 	if (err) {
4674 		free(*lines);
4675 		*lines = NULL;
4676 		*nlines = 0;
4677 	}
4678 	return err;
4679 }
4680 
4681 static const struct got_error *
4682 create_diff(struct tog_diff_view_state *s)
4683 {
4684 	const struct got_error *err = NULL;
4685 	FILE *f = NULL;
4686 	int obj_type;
4687 
4688 	free(s->lines);
4689 	s->lines = malloc(sizeof(*s->lines));
4690 	if (s->lines == NULL)
4691 		return got_error_from_errno("malloc");
4692 	s->nlines = 0;
4693 
4694 	f = got_opentemp();
4695 	if (f == NULL) {
4696 		err = got_error_from_errno("got_opentemp");
4697 		goto done;
4698 	}
4699 	if (s->f && fclose(s->f) == EOF) {
4700 		err = got_error_from_errno("fclose");
4701 		goto done;
4702 	}
4703 	s->f = f;
4704 
4705 	if (s->id1)
4706 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4707 	else
4708 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4709 	if (err)
4710 		goto done;
4711 
4712 	switch (obj_type) {
4713 	case GOT_OBJ_TYPE_BLOB:
4714 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4715 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4716 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4717 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4718 		break;
4719 	case GOT_OBJ_TYPE_TREE:
4720 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4721 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4722 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4723 		    s->force_text_diff, s->repo, s->f);
4724 		break;
4725 	case GOT_OBJ_TYPE_COMMIT: {
4726 		const struct got_object_id_queue *parent_ids;
4727 		struct got_object_qid *pid;
4728 		struct got_commit_object *commit2;
4729 		struct got_reflist_head *refs;
4730 
4731 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4732 		if (err)
4733 			goto done;
4734 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4735 		/* Show commit info if we're diffing to a parent/root commit. */
4736 		if (s->id1 == NULL) {
4737 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4738 			    refs, s->repo, s->f);
4739 			if (err)
4740 				goto done;
4741 		} else {
4742 			parent_ids = got_object_commit_get_parent_ids(commit2);
4743 			STAILQ_FOREACH(pid, parent_ids, entry) {
4744 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4745 					err = write_commit_info(&s->lines,
4746 					    &s->nlines, s->id2, refs, s->repo,
4747 					    s->f);
4748 					if (err)
4749 						goto done;
4750 					break;
4751 				}
4752 			}
4753 		}
4754 		got_object_commit_close(commit2);
4755 
4756 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4757 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4758 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4759 		    s->force_text_diff, s->repo, s->f);
4760 		break;
4761 	}
4762 	default:
4763 		err = got_error(GOT_ERR_OBJ_TYPE);
4764 		break;
4765 	}
4766 done:
4767 	if (s->f && fflush(s->f) != 0 && err == NULL)
4768 		err = got_error_from_errno("fflush");
4769 	return err;
4770 }
4771 
4772 static void
4773 diff_view_indicate_progress(struct tog_view *view)
4774 {
4775 	mvwaddstr(view->window, 0, 0, "diffing...");
4776 	update_panels();
4777 	doupdate();
4778 }
4779 
4780 static const struct got_error *
4781 search_start_diff_view(struct tog_view *view)
4782 {
4783 	struct tog_diff_view_state *s = &view->state.diff;
4784 
4785 	s->matched_line = 0;
4786 	return NULL;
4787 }
4788 
4789 static void
4790 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4791     size_t *nlines, int **first, int **last, int **match, int **selected)
4792 {
4793 	struct tog_diff_view_state *s = &view->state.diff;
4794 
4795 	*f = s->f;
4796 	*nlines = s->nlines;
4797 	*line_offsets = NULL;
4798 	*match = &s->matched_line;
4799 	*first = &s->first_displayed_line;
4800 	*last = &s->last_displayed_line;
4801 	*selected = &s->selected_line;
4802 }
4803 
4804 static const struct got_error *
4805 search_next_view_match(struct tog_view *view)
4806 {
4807 	const struct got_error *err = NULL;
4808 	FILE *f;
4809 	int lineno;
4810 	char *line = NULL;
4811 	size_t linesize = 0;
4812 	ssize_t linelen;
4813 	off_t *line_offsets;
4814 	size_t nlines = 0;
4815 	int *first, *last, *match, *selected;
4816 
4817 	if (!view->search_setup)
4818 		return got_error_msg(GOT_ERR_NOT_IMPL,
4819 		    "view search not supported");
4820 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4821 	    &match, &selected);
4822 
4823 	if (!view->searching) {
4824 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4825 		return NULL;
4826 	}
4827 
4828 	if (*match) {
4829 		if (view->searching == TOG_SEARCH_FORWARD)
4830 			lineno = *match + 1;
4831 		else
4832 			lineno = *match - 1;
4833 	} else
4834 		lineno = *first - 1 + *selected;
4835 
4836 	while (1) {
4837 		off_t offset;
4838 
4839 		if (lineno <= 0 || lineno > nlines) {
4840 			if (*match == 0) {
4841 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4842 				break;
4843 			}
4844 
4845 			if (view->searching == TOG_SEARCH_FORWARD)
4846 				lineno = 1;
4847 			else
4848 				lineno = nlines;
4849 		}
4850 
4851 		offset = view->type == TOG_VIEW_DIFF ?
4852 		    view->state.diff.lines[lineno - 1].offset :
4853 		    line_offsets[lineno - 1];
4854 		if (fseeko(f, offset, SEEK_SET) != 0) {
4855 			free(line);
4856 			return got_error_from_errno("fseeko");
4857 		}
4858 		linelen = getline(&line, &linesize, f);
4859 		if (linelen != -1) {
4860 			char *exstr;
4861 			err = expand_tab(&exstr, line);
4862 			if (err)
4863 				break;
4864 			if (match_line(exstr, &view->regex, 1,
4865 			    &view->regmatch)) {
4866 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4867 				*match = lineno;
4868 				free(exstr);
4869 				break;
4870 			}
4871 			free(exstr);
4872 		}
4873 		if (view->searching == TOG_SEARCH_FORWARD)
4874 			lineno++;
4875 		else
4876 			lineno--;
4877 	}
4878 	free(line);
4879 
4880 	if (*match) {
4881 		*first = *match;
4882 		*selected = 1;
4883 	}
4884 
4885 	return err;
4886 }
4887 
4888 static const struct got_error *
4889 close_diff_view(struct tog_view *view)
4890 {
4891 	const struct got_error *err = NULL;
4892 	struct tog_diff_view_state *s = &view->state.diff;
4893 
4894 	free(s->id1);
4895 	s->id1 = NULL;
4896 	free(s->id2);
4897 	s->id2 = NULL;
4898 	if (s->f && fclose(s->f) == EOF)
4899 		err = got_error_from_errno("fclose");
4900 	s->f = NULL;
4901 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4902 		err = got_error_from_errno("fclose");
4903 	s->f1 = NULL;
4904 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4905 		err = got_error_from_errno("fclose");
4906 	s->f2 = NULL;
4907 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4908 		err = got_error_from_errno("close");
4909 	s->fd1 = -1;
4910 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4911 		err = got_error_from_errno("close");
4912 	s->fd2 = -1;
4913 	free(s->lines);
4914 	s->lines = NULL;
4915 	s->nlines = 0;
4916 	return err;
4917 }
4918 
4919 static const struct got_error *
4920 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4921     struct got_object_id *id2, const char *label1, const char *label2,
4922     int diff_context, int ignore_whitespace, int force_text_diff,
4923     struct tog_view *parent_view, struct got_repository *repo)
4924 {
4925 	const struct got_error *err;
4926 	struct tog_diff_view_state *s = &view->state.diff;
4927 
4928 	memset(s, 0, sizeof(*s));
4929 	s->fd1 = -1;
4930 	s->fd2 = -1;
4931 
4932 	if (id1 != NULL && id2 != NULL) {
4933 	    int type1, type2;
4934 	    err = got_object_get_type(&type1, repo, id1);
4935 	    if (err)
4936 		return err;
4937 	    err = got_object_get_type(&type2, repo, id2);
4938 	    if (err)
4939 		return err;
4940 
4941 	    if (type1 != type2)
4942 		return got_error(GOT_ERR_OBJ_TYPE);
4943 	}
4944 	s->first_displayed_line = 1;
4945 	s->last_displayed_line = view->nlines;
4946 	s->selected_line = 1;
4947 	s->repo = repo;
4948 	s->id1 = id1;
4949 	s->id2 = id2;
4950 	s->label1 = label1;
4951 	s->label2 = label2;
4952 
4953 	if (id1) {
4954 		s->id1 = got_object_id_dup(id1);
4955 		if (s->id1 == NULL)
4956 			return got_error_from_errno("got_object_id_dup");
4957 	} else
4958 		s->id1 = NULL;
4959 
4960 	s->id2 = got_object_id_dup(id2);
4961 	if (s->id2 == NULL) {
4962 		err = got_error_from_errno("got_object_id_dup");
4963 		goto done;
4964 	}
4965 
4966 	s->f1 = got_opentemp();
4967 	if (s->f1 == NULL) {
4968 		err = got_error_from_errno("got_opentemp");
4969 		goto done;
4970 	}
4971 
4972 	s->f2 = got_opentemp();
4973 	if (s->f2 == NULL) {
4974 		err = got_error_from_errno("got_opentemp");
4975 		goto done;
4976 	}
4977 
4978 	s->fd1 = got_opentempfd();
4979 	if (s->fd1 == -1) {
4980 		err = got_error_from_errno("got_opentempfd");
4981 		goto done;
4982 	}
4983 
4984 	s->fd2 = got_opentempfd();
4985 	if (s->fd2 == -1) {
4986 		err = got_error_from_errno("got_opentempfd");
4987 		goto done;
4988 	}
4989 
4990 	s->first_displayed_line = 1;
4991 	s->last_displayed_line = view->nlines;
4992 	s->diff_context = diff_context;
4993 	s->ignore_whitespace = ignore_whitespace;
4994 	s->force_text_diff = force_text_diff;
4995 	s->parent_view = parent_view;
4996 	s->repo = repo;
4997 
4998 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4999 		int rc;
5000 
5001 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5002 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5003 		if (rc != ERR)
5004 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5005 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5006 		if (rc != ERR)
5007 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5008 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5009 		if (rc != ERR)
5010 			rc = init_pair(GOT_DIFF_LINE_META,
5011 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5012 		if (rc != ERR)
5013 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5014 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5015 		if (rc != ERR)
5016 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5017 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5018 		if (rc != ERR)
5019 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5020 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5021 		if (rc != ERR)
5022 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5023 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5024 		if (rc != ERR)
5025 			rc = init_pair(GOT_DIFF_LINE_DATE,
5026 			    get_color_value("TOG_COLOR_DATE"), -1);
5027 		if (rc == ERR) {
5028 			err = got_error(GOT_ERR_RANGE);
5029 			goto done;
5030 		}
5031 	}
5032 
5033 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5034 	    view_is_splitscreen(view))
5035 		show_log_view(parent_view); /* draw border */
5036 	diff_view_indicate_progress(view);
5037 
5038 	err = create_diff(s);
5039 
5040 	view->show = show_diff_view;
5041 	view->input = input_diff_view;
5042 	view->reset = reset_diff_view;
5043 	view->close = close_diff_view;
5044 	view->search_start = search_start_diff_view;
5045 	view->search_setup = search_setup_diff_view;
5046 	view->search_next = search_next_view_match;
5047 done:
5048 	if (err)
5049 		close_diff_view(view);
5050 	return err;
5051 }
5052 
5053 static const struct got_error *
5054 show_diff_view(struct tog_view *view)
5055 {
5056 	const struct got_error *err;
5057 	struct tog_diff_view_state *s = &view->state.diff;
5058 	char *id_str1 = NULL, *id_str2, *header;
5059 	const char *label1, *label2;
5060 
5061 	if (s->id1) {
5062 		err = got_object_id_str(&id_str1, s->id1);
5063 		if (err)
5064 			return err;
5065 		label1 = s->label1 ? s->label1 : id_str1;
5066 	} else
5067 		label1 = "/dev/null";
5068 
5069 	err = got_object_id_str(&id_str2, s->id2);
5070 	if (err)
5071 		return err;
5072 	label2 = s->label2 ? s->label2 : id_str2;
5073 
5074 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5075 		err = got_error_from_errno("asprintf");
5076 		free(id_str1);
5077 		free(id_str2);
5078 		return err;
5079 	}
5080 	free(id_str1);
5081 	free(id_str2);
5082 
5083 	err = draw_file(view, header);
5084 	free(header);
5085 	return err;
5086 }
5087 
5088 static const struct got_error *
5089 set_selected_commit(struct tog_diff_view_state *s,
5090     struct commit_queue_entry *entry)
5091 {
5092 	const struct got_error *err;
5093 	const struct got_object_id_queue *parent_ids;
5094 	struct got_commit_object *selected_commit;
5095 	struct got_object_qid *pid;
5096 
5097 	free(s->id2);
5098 	s->id2 = got_object_id_dup(entry->id);
5099 	if (s->id2 == NULL)
5100 		return got_error_from_errno("got_object_id_dup");
5101 
5102 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5103 	if (err)
5104 		return err;
5105 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5106 	free(s->id1);
5107 	pid = STAILQ_FIRST(parent_ids);
5108 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5109 	got_object_commit_close(selected_commit);
5110 	return NULL;
5111 }
5112 
5113 static const struct got_error *
5114 reset_diff_view(struct tog_view *view)
5115 {
5116 	struct tog_diff_view_state *s = &view->state.diff;
5117 
5118 	view->count = 0;
5119 	wclear(view->window);
5120 	s->first_displayed_line = 1;
5121 	s->last_displayed_line = view->nlines;
5122 	s->matched_line = 0;
5123 	diff_view_indicate_progress(view);
5124 	return create_diff(s);
5125 }
5126 
5127 static void
5128 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5129 {
5130 	int start, i;
5131 
5132 	i = start = s->first_displayed_line - 1;
5133 
5134 	while (s->lines[i].type != type) {
5135 		if (i == 0)
5136 			i = s->nlines - 1;
5137 		if (--i == start)
5138 			return; /* do nothing, requested type not in file */
5139 	}
5140 
5141 	s->selected_line = 1;
5142 	s->first_displayed_line = i;
5143 }
5144 
5145 static void
5146 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5147 {
5148 	int start, i;
5149 
5150 	i = start = s->first_displayed_line + 1;
5151 
5152 	while (s->lines[i].type != type) {
5153 		if (i == s->nlines - 1)
5154 			i = 0;
5155 		if (++i == start)
5156 			return; /* do nothing, requested type not in file */
5157 	}
5158 
5159 	s->selected_line = 1;
5160 	s->first_displayed_line = i;
5161 }
5162 
5163 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5164     int, int, int);
5165 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5166     int, int);
5167 
5168 static const struct got_error *
5169 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5170 {
5171 	const struct got_error *err = NULL;
5172 	struct tog_diff_view_state *s = &view->state.diff;
5173 	struct tog_log_view_state *ls;
5174 	struct commit_queue_entry *old_selected_entry;
5175 	char *line = NULL;
5176 	size_t linesize = 0;
5177 	ssize_t linelen;
5178 	int i, nscroll = view->nlines - 1, up = 0;
5179 
5180 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5181 
5182 	switch (ch) {
5183 	case '0':
5184 		view->x = 0;
5185 		break;
5186 	case '$':
5187 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5188 		view->count = 0;
5189 		break;
5190 	case KEY_RIGHT:
5191 	case 'l':
5192 		if (view->x + view->ncols / 3 < view->maxx)
5193 			view->x += 2;  /* move two columns right */
5194 		else
5195 			view->count = 0;
5196 		break;
5197 	case KEY_LEFT:
5198 	case 'h':
5199 		view->x -= MIN(view->x, 2);  /* move two columns back */
5200 		if (view->x <= 0)
5201 			view->count = 0;
5202 		break;
5203 	case 'a':
5204 	case 'w':
5205 		if (ch == 'a')
5206 			s->force_text_diff = !s->force_text_diff;
5207 		if (ch == 'w')
5208 			s->ignore_whitespace = !s->ignore_whitespace;
5209 		err = reset_diff_view(view);
5210 		break;
5211 	case 'g':
5212 	case KEY_HOME:
5213 		s->first_displayed_line = 1;
5214 		view->count = 0;
5215 		break;
5216 	case 'G':
5217 	case KEY_END:
5218 		view->count = 0;
5219 		if (s->eof)
5220 			break;
5221 
5222 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5223 		s->eof = 1;
5224 		break;
5225 	case 'k':
5226 	case KEY_UP:
5227 	case CTRL('p'):
5228 		if (s->first_displayed_line > 1)
5229 			s->first_displayed_line--;
5230 		else
5231 			view->count = 0;
5232 		break;
5233 	case CTRL('u'):
5234 	case 'u':
5235 		nscroll /= 2;
5236 		/* FALL THROUGH */
5237 	case KEY_PPAGE:
5238 	case CTRL('b'):
5239 	case 'b':
5240 		if (s->first_displayed_line == 1) {
5241 			view->count = 0;
5242 			break;
5243 		}
5244 		i = 0;
5245 		while (i++ < nscroll && s->first_displayed_line > 1)
5246 			s->first_displayed_line--;
5247 		break;
5248 	case 'j':
5249 	case KEY_DOWN:
5250 	case CTRL('n'):
5251 		if (!s->eof)
5252 			s->first_displayed_line++;
5253 		else
5254 			view->count = 0;
5255 		break;
5256 	case CTRL('d'):
5257 	case 'd':
5258 		nscroll /= 2;
5259 		/* FALL THROUGH */
5260 	case KEY_NPAGE:
5261 	case CTRL('f'):
5262 	case 'f':
5263 	case ' ':
5264 		if (s->eof) {
5265 			view->count = 0;
5266 			break;
5267 		}
5268 		i = 0;
5269 		while (!s->eof && i++ < nscroll) {
5270 			linelen = getline(&line, &linesize, s->f);
5271 			s->first_displayed_line++;
5272 			if (linelen == -1) {
5273 				if (feof(s->f)) {
5274 					s->eof = 1;
5275 				} else
5276 					err = got_ferror(s->f, GOT_ERR_IO);
5277 				break;
5278 			}
5279 		}
5280 		free(line);
5281 		break;
5282 	case '(':
5283 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5284 		break;
5285 	case ')':
5286 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5287 		break;
5288 	case '{':
5289 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5290 		break;
5291 	case '}':
5292 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5293 		break;
5294 	case '[':
5295 		if (s->diff_context > 0) {
5296 			s->diff_context--;
5297 			s->matched_line = 0;
5298 			diff_view_indicate_progress(view);
5299 			err = create_diff(s);
5300 			if (s->first_displayed_line + view->nlines - 1 >
5301 			    s->nlines) {
5302 				s->first_displayed_line = 1;
5303 				s->last_displayed_line = view->nlines;
5304 			}
5305 		} else
5306 			view->count = 0;
5307 		break;
5308 	case ']':
5309 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5310 			s->diff_context++;
5311 			s->matched_line = 0;
5312 			diff_view_indicate_progress(view);
5313 			err = create_diff(s);
5314 		} else
5315 			view->count = 0;
5316 		break;
5317 	case '<':
5318 	case ',':
5319 	case 'K':
5320 		up = 1;
5321 		/* FALL THROUGH */
5322 	case '>':
5323 	case '.':
5324 	case 'J':
5325 		if (s->parent_view == NULL) {
5326 			view->count = 0;
5327 			break;
5328 		}
5329 		s->parent_view->count = view->count;
5330 
5331 		if (s->parent_view->type == TOG_VIEW_LOG) {
5332 			ls = &s->parent_view->state.log;
5333 			old_selected_entry = ls->selected_entry;
5334 
5335 			err = input_log_view(NULL, s->parent_view,
5336 			    up ? KEY_UP : KEY_DOWN);
5337 			if (err)
5338 				break;
5339 			view->count = s->parent_view->count;
5340 
5341 			if (old_selected_entry == ls->selected_entry)
5342 				break;
5343 
5344 			err = set_selected_commit(s, ls->selected_entry);
5345 			if (err)
5346 				break;
5347 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5348 			struct tog_blame_view_state *bs;
5349 			struct got_object_id *id, *prev_id;
5350 
5351 			bs = &s->parent_view->state.blame;
5352 			prev_id = get_annotation_for_line(bs->blame.lines,
5353 			    bs->blame.nlines, bs->last_diffed_line);
5354 
5355 			err = input_blame_view(&view, s->parent_view,
5356 			    up ? KEY_UP : KEY_DOWN);
5357 			if (err)
5358 				break;
5359 			view->count = s->parent_view->count;
5360 
5361 			if (prev_id == NULL)
5362 				break;
5363 			id = get_selected_commit_id(bs->blame.lines,
5364 			    bs->blame.nlines, bs->first_displayed_line,
5365 			    bs->selected_line);
5366 			if (id == NULL)
5367 				break;
5368 
5369 			if (!got_object_id_cmp(prev_id, id))
5370 				break;
5371 
5372 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5373 			if (err)
5374 				break;
5375 		}
5376 		s->first_displayed_line = 1;
5377 		s->last_displayed_line = view->nlines;
5378 		s->matched_line = 0;
5379 		view->x = 0;
5380 
5381 		diff_view_indicate_progress(view);
5382 		err = create_diff(s);
5383 		break;
5384 	default:
5385 		view->count = 0;
5386 		break;
5387 	}
5388 
5389 	return err;
5390 }
5391 
5392 static const struct got_error *
5393 cmd_diff(int argc, char *argv[])
5394 {
5395 	const struct got_error *error = NULL;
5396 	struct got_repository *repo = NULL;
5397 	struct got_worktree *worktree = NULL;
5398 	struct got_object_id *id1 = NULL, *id2 = NULL;
5399 	char *repo_path = NULL, *cwd = NULL;
5400 	char *id_str1 = NULL, *id_str2 = NULL;
5401 	char *label1 = NULL, *label2 = NULL;
5402 	int diff_context = 3, ignore_whitespace = 0;
5403 	int ch, force_text_diff = 0;
5404 	const char *errstr;
5405 	struct tog_view *view;
5406 	int *pack_fds = NULL;
5407 
5408 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5409 		switch (ch) {
5410 		case 'a':
5411 			force_text_diff = 1;
5412 			break;
5413 		case 'C':
5414 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5415 			    &errstr);
5416 			if (errstr != NULL)
5417 				errx(1, "number of context lines is %s: %s",
5418 				    errstr, errstr);
5419 			break;
5420 		case 'r':
5421 			repo_path = realpath(optarg, NULL);
5422 			if (repo_path == NULL)
5423 				return got_error_from_errno2("realpath",
5424 				    optarg);
5425 			got_path_strip_trailing_slashes(repo_path);
5426 			break;
5427 		case 'w':
5428 			ignore_whitespace = 1;
5429 			break;
5430 		default:
5431 			usage_diff();
5432 			/* NOTREACHED */
5433 		}
5434 	}
5435 
5436 	argc -= optind;
5437 	argv += optind;
5438 
5439 	if (argc == 0) {
5440 		usage_diff(); /* TODO show local worktree changes */
5441 	} else if (argc == 2) {
5442 		id_str1 = argv[0];
5443 		id_str2 = argv[1];
5444 	} else
5445 		usage_diff();
5446 
5447 	error = got_repo_pack_fds_open(&pack_fds);
5448 	if (error)
5449 		goto done;
5450 
5451 	if (repo_path == NULL) {
5452 		cwd = getcwd(NULL, 0);
5453 		if (cwd == NULL)
5454 			return got_error_from_errno("getcwd");
5455 		error = got_worktree_open(&worktree, cwd);
5456 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5457 			goto done;
5458 		if (worktree)
5459 			repo_path =
5460 			    strdup(got_worktree_get_repo_path(worktree));
5461 		else
5462 			repo_path = strdup(cwd);
5463 		if (repo_path == NULL) {
5464 			error = got_error_from_errno("strdup");
5465 			goto done;
5466 		}
5467 	}
5468 
5469 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5470 	if (error)
5471 		goto done;
5472 
5473 	init_curses();
5474 
5475 	error = apply_unveil(got_repo_get_path(repo), NULL);
5476 	if (error)
5477 		goto done;
5478 
5479 	error = tog_load_refs(repo, 0);
5480 	if (error)
5481 		goto done;
5482 
5483 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5484 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5485 	if (error)
5486 		goto done;
5487 
5488 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5489 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5490 	if (error)
5491 		goto done;
5492 
5493 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5494 	if (view == NULL) {
5495 		error = got_error_from_errno("view_open");
5496 		goto done;
5497 	}
5498 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5499 	    ignore_whitespace, force_text_diff, NULL,  repo);
5500 	if (error)
5501 		goto done;
5502 	error = view_loop(view);
5503 done:
5504 	free(label1);
5505 	free(label2);
5506 	free(repo_path);
5507 	free(cwd);
5508 	if (repo) {
5509 		const struct got_error *close_err = got_repo_close(repo);
5510 		if (error == NULL)
5511 			error = close_err;
5512 	}
5513 	if (worktree)
5514 		got_worktree_close(worktree);
5515 	if (pack_fds) {
5516 		const struct got_error *pack_err =
5517 		    got_repo_pack_fds_close(pack_fds);
5518 		if (error == NULL)
5519 			error = pack_err;
5520 	}
5521 	tog_free_refs();
5522 	return error;
5523 }
5524 
5525 __dead static void
5526 usage_blame(void)
5527 {
5528 	endwin();
5529 	fprintf(stderr,
5530 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5531 	    getprogname());
5532 	exit(1);
5533 }
5534 
5535 struct tog_blame_line {
5536 	int annotated;
5537 	struct got_object_id *id;
5538 };
5539 
5540 static const struct got_error *
5541 draw_blame(struct tog_view *view)
5542 {
5543 	struct tog_blame_view_state *s = &view->state.blame;
5544 	struct tog_blame *blame = &s->blame;
5545 	regmatch_t *regmatch = &view->regmatch;
5546 	const struct got_error *err;
5547 	int lineno = 0, nprinted = 0;
5548 	char *line = NULL;
5549 	size_t linesize = 0;
5550 	ssize_t linelen;
5551 	wchar_t *wline;
5552 	int width;
5553 	struct tog_blame_line *blame_line;
5554 	struct got_object_id *prev_id = NULL;
5555 	char *id_str;
5556 	struct tog_color *tc;
5557 
5558 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5559 	if (err)
5560 		return err;
5561 
5562 	rewind(blame->f);
5563 	werase(view->window);
5564 
5565 	if (asprintf(&line, "commit %s", id_str) == -1) {
5566 		err = got_error_from_errno("asprintf");
5567 		free(id_str);
5568 		return err;
5569 	}
5570 
5571 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5572 	free(line);
5573 	line = NULL;
5574 	if (err)
5575 		return err;
5576 	if (view_needs_focus_indication(view))
5577 		wstandout(view->window);
5578 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5579 	if (tc)
5580 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5581 	waddwstr(view->window, wline);
5582 	while (width++ < view->ncols)
5583 		waddch(view->window, ' ');
5584 	if (tc)
5585 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5586 	if (view_needs_focus_indication(view))
5587 		wstandend(view->window);
5588 	free(wline);
5589 	wline = NULL;
5590 
5591 	if (view->gline > blame->nlines)
5592 		view->gline = blame->nlines;
5593 
5594 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5595 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5596 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5597 		free(id_str);
5598 		return got_error_from_errno("asprintf");
5599 	}
5600 	free(id_str);
5601 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5602 	free(line);
5603 	line = NULL;
5604 	if (err)
5605 		return err;
5606 	waddwstr(view->window, wline);
5607 	free(wline);
5608 	wline = NULL;
5609 	if (width < view->ncols - 1)
5610 		waddch(view->window, '\n');
5611 
5612 	s->eof = 0;
5613 	view->maxx = 0;
5614 	while (nprinted < view->nlines - 2) {
5615 		linelen = getline(&line, &linesize, blame->f);
5616 		if (linelen == -1) {
5617 			if (feof(blame->f)) {
5618 				s->eof = 1;
5619 				break;
5620 			}
5621 			free(line);
5622 			return got_ferror(blame->f, GOT_ERR_IO);
5623 		}
5624 		if (++lineno < s->first_displayed_line)
5625 			continue;
5626 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5627 			continue;
5628 
5629 		/* Set view->maxx based on full line length. */
5630 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5631 		if (err) {
5632 			free(line);
5633 			return err;
5634 		}
5635 		free(wline);
5636 		wline = NULL;
5637 		view->maxx = MAX(view->maxx, width);
5638 
5639 		if (nprinted == s->selected_line - 1)
5640 			wstandout(view->window);
5641 
5642 		if (blame->nlines > 0) {
5643 			blame_line = &blame->lines[lineno - 1];
5644 			if (blame_line->annotated && prev_id &&
5645 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5646 			    !(nprinted == s->selected_line - 1)) {
5647 				waddstr(view->window, "        ");
5648 			} else if (blame_line->annotated) {
5649 				char *id_str;
5650 				err = got_object_id_str(&id_str,
5651 				    blame_line->id);
5652 				if (err) {
5653 					free(line);
5654 					return err;
5655 				}
5656 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5657 				if (tc)
5658 					wattr_on(view->window,
5659 					    COLOR_PAIR(tc->colorpair), NULL);
5660 				wprintw(view->window, "%.8s", id_str);
5661 				if (tc)
5662 					wattr_off(view->window,
5663 					    COLOR_PAIR(tc->colorpair), NULL);
5664 				free(id_str);
5665 				prev_id = blame_line->id;
5666 			} else {
5667 				waddstr(view->window, "........");
5668 				prev_id = NULL;
5669 			}
5670 		} else {
5671 			waddstr(view->window, "........");
5672 			prev_id = NULL;
5673 		}
5674 
5675 		if (nprinted == s->selected_line - 1)
5676 			wstandend(view->window);
5677 		waddstr(view->window, " ");
5678 
5679 		if (view->ncols <= 9) {
5680 			width = 9;
5681 		} else if (s->first_displayed_line + nprinted ==
5682 		    s->matched_line &&
5683 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5684 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5685 			    view->window, view->x, regmatch);
5686 			if (err) {
5687 				free(line);
5688 				return err;
5689 			}
5690 			width += 9;
5691 		} else {
5692 			int skip;
5693 			err = format_line(&wline, &width, &skip, line,
5694 			    view->x, view->ncols - 9, 9, 1);
5695 			if (err) {
5696 				free(line);
5697 				return err;
5698 			}
5699 			waddwstr(view->window, &wline[skip]);
5700 			width += 9;
5701 			free(wline);
5702 			wline = NULL;
5703 		}
5704 
5705 		if (width <= view->ncols - 1)
5706 			waddch(view->window, '\n');
5707 		if (++nprinted == 1)
5708 			s->first_displayed_line = lineno;
5709 	}
5710 	free(line);
5711 	s->last_displayed_line = lineno;
5712 
5713 	view_border(view);
5714 
5715 	return NULL;
5716 }
5717 
5718 static const struct got_error *
5719 blame_cb(void *arg, int nlines, int lineno,
5720     struct got_commit_object *commit, struct got_object_id *id)
5721 {
5722 	const struct got_error *err = NULL;
5723 	struct tog_blame_cb_args *a = arg;
5724 	struct tog_blame_line *line;
5725 	int errcode;
5726 
5727 	if (nlines != a->nlines ||
5728 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5729 		return got_error(GOT_ERR_RANGE);
5730 
5731 	errcode = pthread_mutex_lock(&tog_mutex);
5732 	if (errcode)
5733 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5734 
5735 	if (*a->quit) {	/* user has quit the blame view */
5736 		err = got_error(GOT_ERR_ITER_COMPLETED);
5737 		goto done;
5738 	}
5739 
5740 	if (lineno == -1)
5741 		goto done; /* no change in this commit */
5742 
5743 	line = &a->lines[lineno - 1];
5744 	if (line->annotated)
5745 		goto done;
5746 
5747 	line->id = got_object_id_dup(id);
5748 	if (line->id == NULL) {
5749 		err = got_error_from_errno("got_object_id_dup");
5750 		goto done;
5751 	}
5752 	line->annotated = 1;
5753 done:
5754 	errcode = pthread_mutex_unlock(&tog_mutex);
5755 	if (errcode)
5756 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5757 	return err;
5758 }
5759 
5760 static void *
5761 blame_thread(void *arg)
5762 {
5763 	const struct got_error *err, *close_err;
5764 	struct tog_blame_thread_args *ta = arg;
5765 	struct tog_blame_cb_args *a = ta->cb_args;
5766 	int errcode, fd1 = -1, fd2 = -1;
5767 	FILE *f1 = NULL, *f2 = NULL;
5768 
5769 	fd1 = got_opentempfd();
5770 	if (fd1 == -1)
5771 		return (void *)got_error_from_errno("got_opentempfd");
5772 
5773 	fd2 = got_opentempfd();
5774 	if (fd2 == -1) {
5775 		err = got_error_from_errno("got_opentempfd");
5776 		goto done;
5777 	}
5778 
5779 	f1 = got_opentemp();
5780 	if (f1 == NULL) {
5781 		err = (void *)got_error_from_errno("got_opentemp");
5782 		goto done;
5783 	}
5784 	f2 = got_opentemp();
5785 	if (f2 == NULL) {
5786 		err = (void *)got_error_from_errno("got_opentemp");
5787 		goto done;
5788 	}
5789 
5790 	err = block_signals_used_by_main_thread();
5791 	if (err)
5792 		goto done;
5793 
5794 	err = got_blame(ta->path, a->commit_id, ta->repo,
5795 	    tog_diff_algo, blame_cb, ta->cb_args,
5796 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5797 	if (err && err->code == GOT_ERR_CANCELLED)
5798 		err = NULL;
5799 
5800 	errcode = pthread_mutex_lock(&tog_mutex);
5801 	if (errcode) {
5802 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5803 		goto done;
5804 	}
5805 
5806 	close_err = got_repo_close(ta->repo);
5807 	if (err == NULL)
5808 		err = close_err;
5809 	ta->repo = NULL;
5810 	*ta->complete = 1;
5811 
5812 	errcode = pthread_mutex_unlock(&tog_mutex);
5813 	if (errcode && err == NULL)
5814 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5815 
5816 done:
5817 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5818 		err = got_error_from_errno("close");
5819 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5820 		err = got_error_from_errno("close");
5821 	if (f1 && fclose(f1) == EOF && err == NULL)
5822 		err = got_error_from_errno("fclose");
5823 	if (f2 && fclose(f2) == EOF && err == NULL)
5824 		err = got_error_from_errno("fclose");
5825 
5826 	return (void *)err;
5827 }
5828 
5829 static struct got_object_id *
5830 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5831     int first_displayed_line, int selected_line)
5832 {
5833 	struct tog_blame_line *line;
5834 
5835 	if (nlines <= 0)
5836 		return NULL;
5837 
5838 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5839 	if (!line->annotated)
5840 		return NULL;
5841 
5842 	return line->id;
5843 }
5844 
5845 static struct got_object_id *
5846 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5847     int lineno)
5848 {
5849 	struct tog_blame_line *line;
5850 
5851 	if (nlines <= 0 || lineno >= nlines)
5852 		return NULL;
5853 
5854 	line = &lines[lineno - 1];
5855 	if (!line->annotated)
5856 		return NULL;
5857 
5858 	return line->id;
5859 }
5860 
5861 static const struct got_error *
5862 stop_blame(struct tog_blame *blame)
5863 {
5864 	const struct got_error *err = NULL;
5865 	int i;
5866 
5867 	if (blame->thread) {
5868 		int errcode;
5869 		errcode = pthread_mutex_unlock(&tog_mutex);
5870 		if (errcode)
5871 			return got_error_set_errno(errcode,
5872 			    "pthread_mutex_unlock");
5873 		errcode = pthread_join(blame->thread, (void **)&err);
5874 		if (errcode)
5875 			return got_error_set_errno(errcode, "pthread_join");
5876 		errcode = pthread_mutex_lock(&tog_mutex);
5877 		if (errcode)
5878 			return got_error_set_errno(errcode,
5879 			    "pthread_mutex_lock");
5880 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5881 			err = NULL;
5882 		blame->thread = 0; //NULL;
5883 	}
5884 	if (blame->thread_args.repo) {
5885 		const struct got_error *close_err;
5886 		close_err = got_repo_close(blame->thread_args.repo);
5887 		if (err == NULL)
5888 			err = close_err;
5889 		blame->thread_args.repo = NULL;
5890 	}
5891 	if (blame->f) {
5892 		if (fclose(blame->f) == EOF && err == NULL)
5893 			err = got_error_from_errno("fclose");
5894 		blame->f = NULL;
5895 	}
5896 	if (blame->lines) {
5897 		for (i = 0; i < blame->nlines; i++)
5898 			free(blame->lines[i].id);
5899 		free(blame->lines);
5900 		blame->lines = NULL;
5901 	}
5902 	free(blame->cb_args.commit_id);
5903 	blame->cb_args.commit_id = NULL;
5904 	if (blame->pack_fds) {
5905 		const struct got_error *pack_err =
5906 		    got_repo_pack_fds_close(blame->pack_fds);
5907 		if (err == NULL)
5908 			err = pack_err;
5909 		blame->pack_fds = NULL;
5910 	}
5911 	return err;
5912 }
5913 
5914 static const struct got_error *
5915 cancel_blame_view(void *arg)
5916 {
5917 	const struct got_error *err = NULL;
5918 	int *done = arg;
5919 	int errcode;
5920 
5921 	errcode = pthread_mutex_lock(&tog_mutex);
5922 	if (errcode)
5923 		return got_error_set_errno(errcode,
5924 		    "pthread_mutex_unlock");
5925 
5926 	if (*done)
5927 		err = got_error(GOT_ERR_CANCELLED);
5928 
5929 	errcode = pthread_mutex_unlock(&tog_mutex);
5930 	if (errcode)
5931 		return got_error_set_errno(errcode,
5932 		    "pthread_mutex_lock");
5933 
5934 	return err;
5935 }
5936 
5937 static const struct got_error *
5938 run_blame(struct tog_view *view)
5939 {
5940 	struct tog_blame_view_state *s = &view->state.blame;
5941 	struct tog_blame *blame = &s->blame;
5942 	const struct got_error *err = NULL;
5943 	struct got_commit_object *commit = NULL;
5944 	struct got_blob_object *blob = NULL;
5945 	struct got_repository *thread_repo = NULL;
5946 	struct got_object_id *obj_id = NULL;
5947 	int obj_type, fd = -1;
5948 	int *pack_fds = NULL;
5949 
5950 	err = got_object_open_as_commit(&commit, s->repo,
5951 	    &s->blamed_commit->id);
5952 	if (err)
5953 		return err;
5954 
5955 	fd = got_opentempfd();
5956 	if (fd == -1) {
5957 		err = got_error_from_errno("got_opentempfd");
5958 		goto done;
5959 	}
5960 
5961 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5962 	if (err)
5963 		goto done;
5964 
5965 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5966 	if (err)
5967 		goto done;
5968 
5969 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5970 		err = got_error(GOT_ERR_OBJ_TYPE);
5971 		goto done;
5972 	}
5973 
5974 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5975 	if (err)
5976 		goto done;
5977 	blame->f = got_opentemp();
5978 	if (blame->f == NULL) {
5979 		err = got_error_from_errno("got_opentemp");
5980 		goto done;
5981 	}
5982 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5983 	    &blame->line_offsets, blame->f, blob);
5984 	if (err)
5985 		goto done;
5986 	if (blame->nlines == 0) {
5987 		s->blame_complete = 1;
5988 		goto done;
5989 	}
5990 
5991 	/* Don't include \n at EOF in the blame line count. */
5992 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5993 		blame->nlines--;
5994 
5995 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5996 	if (blame->lines == NULL) {
5997 		err = got_error_from_errno("calloc");
5998 		goto done;
5999 	}
6000 
6001 	err = got_repo_pack_fds_open(&pack_fds);
6002 	if (err)
6003 		goto done;
6004 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6005 	    pack_fds);
6006 	if (err)
6007 		goto done;
6008 
6009 	blame->pack_fds = pack_fds;
6010 	blame->cb_args.view = view;
6011 	blame->cb_args.lines = blame->lines;
6012 	blame->cb_args.nlines = blame->nlines;
6013 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6014 	if (blame->cb_args.commit_id == NULL) {
6015 		err = got_error_from_errno("got_object_id_dup");
6016 		goto done;
6017 	}
6018 	blame->cb_args.quit = &s->done;
6019 
6020 	blame->thread_args.path = s->path;
6021 	blame->thread_args.repo = thread_repo;
6022 	blame->thread_args.cb_args = &blame->cb_args;
6023 	blame->thread_args.complete = &s->blame_complete;
6024 	blame->thread_args.cancel_cb = cancel_blame_view;
6025 	blame->thread_args.cancel_arg = &s->done;
6026 	s->blame_complete = 0;
6027 
6028 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6029 		s->first_displayed_line = 1;
6030 		s->last_displayed_line = view->nlines;
6031 		s->selected_line = 1;
6032 	}
6033 	s->matched_line = 0;
6034 
6035 done:
6036 	if (commit)
6037 		got_object_commit_close(commit);
6038 	if (fd != -1 && close(fd) == -1 && err == NULL)
6039 		err = got_error_from_errno("close");
6040 	if (blob)
6041 		got_object_blob_close(blob);
6042 	free(obj_id);
6043 	if (err)
6044 		stop_blame(blame);
6045 	return err;
6046 }
6047 
6048 static const struct got_error *
6049 open_blame_view(struct tog_view *view, char *path,
6050     struct got_object_id *commit_id, struct got_repository *repo)
6051 {
6052 	const struct got_error *err = NULL;
6053 	struct tog_blame_view_state *s = &view->state.blame;
6054 
6055 	STAILQ_INIT(&s->blamed_commits);
6056 
6057 	s->path = strdup(path);
6058 	if (s->path == NULL)
6059 		return got_error_from_errno("strdup");
6060 
6061 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6062 	if (err) {
6063 		free(s->path);
6064 		return err;
6065 	}
6066 
6067 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6068 	s->first_displayed_line = 1;
6069 	s->last_displayed_line = view->nlines;
6070 	s->selected_line = 1;
6071 	s->blame_complete = 0;
6072 	s->repo = repo;
6073 	s->commit_id = commit_id;
6074 	memset(&s->blame, 0, sizeof(s->blame));
6075 
6076 	STAILQ_INIT(&s->colors);
6077 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6078 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6079 		    get_color_value("TOG_COLOR_COMMIT"));
6080 		if (err)
6081 			return err;
6082 	}
6083 
6084 	view->show = show_blame_view;
6085 	view->input = input_blame_view;
6086 	view->reset = reset_blame_view;
6087 	view->close = close_blame_view;
6088 	view->search_start = search_start_blame_view;
6089 	view->search_setup = search_setup_blame_view;
6090 	view->search_next = search_next_view_match;
6091 
6092 	return run_blame(view);
6093 }
6094 
6095 static const struct got_error *
6096 close_blame_view(struct tog_view *view)
6097 {
6098 	const struct got_error *err = NULL;
6099 	struct tog_blame_view_state *s = &view->state.blame;
6100 
6101 	if (s->blame.thread)
6102 		err = stop_blame(&s->blame);
6103 
6104 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6105 		struct got_object_qid *blamed_commit;
6106 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6107 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6108 		got_object_qid_free(blamed_commit);
6109 	}
6110 
6111 	free(s->path);
6112 	free_colors(&s->colors);
6113 	return err;
6114 }
6115 
6116 static const struct got_error *
6117 search_start_blame_view(struct tog_view *view)
6118 {
6119 	struct tog_blame_view_state *s = &view->state.blame;
6120 
6121 	s->matched_line = 0;
6122 	return NULL;
6123 }
6124 
6125 static void
6126 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6127     size_t *nlines, int **first, int **last, int **match, int **selected)
6128 {
6129 	struct tog_blame_view_state *s = &view->state.blame;
6130 
6131 	*f = s->blame.f;
6132 	*nlines = s->blame.nlines;
6133 	*line_offsets = s->blame.line_offsets;
6134 	*match = &s->matched_line;
6135 	*first = &s->first_displayed_line;
6136 	*last = &s->last_displayed_line;
6137 	*selected = &s->selected_line;
6138 }
6139 
6140 static const struct got_error *
6141 show_blame_view(struct tog_view *view)
6142 {
6143 	const struct got_error *err = NULL;
6144 	struct tog_blame_view_state *s = &view->state.blame;
6145 	int errcode;
6146 
6147 	if (s->blame.thread == 0 && !s->blame_complete) {
6148 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6149 		    &s->blame.thread_args);
6150 		if (errcode)
6151 			return got_error_set_errno(errcode, "pthread_create");
6152 
6153 		halfdelay(1); /* fast refresh while annotating  */
6154 	}
6155 
6156 	if (s->blame_complete)
6157 		halfdelay(10); /* disable fast refresh */
6158 
6159 	err = draw_blame(view);
6160 
6161 	view_border(view);
6162 	return err;
6163 }
6164 
6165 static const struct got_error *
6166 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6167     struct got_repository *repo, struct got_object_id *id)
6168 {
6169 	struct tog_view		*log_view;
6170 	const struct got_error	*err = NULL;
6171 
6172 	*new_view = NULL;
6173 
6174 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6175 	if (log_view == NULL)
6176 		return got_error_from_errno("view_open");
6177 
6178 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6179 	if (err)
6180 		view_close(log_view);
6181 	else
6182 		*new_view = log_view;
6183 
6184 	return err;
6185 }
6186 
6187 static const struct got_error *
6188 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6189 {
6190 	const struct got_error *err = NULL, *thread_err = NULL;
6191 	struct tog_view *diff_view;
6192 	struct tog_blame_view_state *s = &view->state.blame;
6193 	int eos, nscroll, begin_y = 0, begin_x = 0;
6194 
6195 	eos = nscroll = view->nlines - 2;
6196 	if (view_is_hsplit_top(view))
6197 		--eos;  /* border */
6198 
6199 	switch (ch) {
6200 	case '0':
6201 		view->x = 0;
6202 		break;
6203 	case '$':
6204 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6205 		view->count = 0;
6206 		break;
6207 	case KEY_RIGHT:
6208 	case 'l':
6209 		if (view->x + view->ncols / 3 < view->maxx)
6210 			view->x += 2;  /* move two columns right */
6211 		else
6212 			view->count = 0;
6213 		break;
6214 	case KEY_LEFT:
6215 	case 'h':
6216 		view->x -= MIN(view->x, 2);  /* move two columns back */
6217 		if (view->x <= 0)
6218 			view->count = 0;
6219 		break;
6220 	case 'q':
6221 		s->done = 1;
6222 		break;
6223 	case 'g':
6224 	case KEY_HOME:
6225 		s->selected_line = 1;
6226 		s->first_displayed_line = 1;
6227 		view->count = 0;
6228 		break;
6229 	case 'G':
6230 	case KEY_END:
6231 		if (s->blame.nlines < eos) {
6232 			s->selected_line = s->blame.nlines;
6233 			s->first_displayed_line = 1;
6234 		} else {
6235 			s->selected_line = eos;
6236 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6237 		}
6238 		view->count = 0;
6239 		break;
6240 	case 'k':
6241 	case KEY_UP:
6242 	case CTRL('p'):
6243 		if (s->selected_line > 1)
6244 			s->selected_line--;
6245 		else if (s->selected_line == 1 &&
6246 		    s->first_displayed_line > 1)
6247 			s->first_displayed_line--;
6248 		else
6249 			view->count = 0;
6250 		break;
6251 	case CTRL('u'):
6252 	case 'u':
6253 		nscroll /= 2;
6254 		/* FALL THROUGH */
6255 	case KEY_PPAGE:
6256 	case CTRL('b'):
6257 	case 'b':
6258 		if (s->first_displayed_line == 1) {
6259 			if (view->count > 1)
6260 				nscroll += nscroll;
6261 			s->selected_line = MAX(1, s->selected_line - nscroll);
6262 			view->count = 0;
6263 			break;
6264 		}
6265 		if (s->first_displayed_line > nscroll)
6266 			s->first_displayed_line -= nscroll;
6267 		else
6268 			s->first_displayed_line = 1;
6269 		break;
6270 	case 'j':
6271 	case KEY_DOWN:
6272 	case CTRL('n'):
6273 		if (s->selected_line < eos && s->first_displayed_line +
6274 		    s->selected_line <= s->blame.nlines)
6275 			s->selected_line++;
6276 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6277 			s->first_displayed_line++;
6278 		else
6279 			view->count = 0;
6280 		break;
6281 	case 'c':
6282 	case 'p': {
6283 		struct got_object_id *id = NULL;
6284 
6285 		view->count = 0;
6286 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6287 		    s->first_displayed_line, s->selected_line);
6288 		if (id == NULL)
6289 			break;
6290 		if (ch == 'p') {
6291 			struct got_commit_object *commit, *pcommit;
6292 			struct got_object_qid *pid;
6293 			struct got_object_id *blob_id = NULL;
6294 			int obj_type;
6295 			err = got_object_open_as_commit(&commit,
6296 			    s->repo, id);
6297 			if (err)
6298 				break;
6299 			pid = STAILQ_FIRST(
6300 			    got_object_commit_get_parent_ids(commit));
6301 			if (pid == NULL) {
6302 				got_object_commit_close(commit);
6303 				break;
6304 			}
6305 			/* Check if path history ends here. */
6306 			err = got_object_open_as_commit(&pcommit,
6307 			    s->repo, &pid->id);
6308 			if (err)
6309 				break;
6310 			err = got_object_id_by_path(&blob_id, s->repo,
6311 			    pcommit, s->path);
6312 			got_object_commit_close(pcommit);
6313 			if (err) {
6314 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6315 					err = NULL;
6316 				got_object_commit_close(commit);
6317 				break;
6318 			}
6319 			err = got_object_get_type(&obj_type, s->repo,
6320 			    blob_id);
6321 			free(blob_id);
6322 			/* Can't blame non-blob type objects. */
6323 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6324 				got_object_commit_close(commit);
6325 				break;
6326 			}
6327 			err = got_object_qid_alloc(&s->blamed_commit,
6328 			    &pid->id);
6329 			got_object_commit_close(commit);
6330 		} else {
6331 			if (got_object_id_cmp(id,
6332 			    &s->blamed_commit->id) == 0)
6333 				break;
6334 			err = got_object_qid_alloc(&s->blamed_commit,
6335 			    id);
6336 		}
6337 		if (err)
6338 			break;
6339 		s->done = 1;
6340 		thread_err = stop_blame(&s->blame);
6341 		s->done = 0;
6342 		if (thread_err)
6343 			break;
6344 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6345 		    s->blamed_commit, entry);
6346 		err = run_blame(view);
6347 		if (err)
6348 			break;
6349 		break;
6350 	}
6351 	case 'C': {
6352 		struct got_object_qid *first;
6353 
6354 		view->count = 0;
6355 		first = STAILQ_FIRST(&s->blamed_commits);
6356 		if (!got_object_id_cmp(&first->id, s->commit_id))
6357 			break;
6358 		s->done = 1;
6359 		thread_err = stop_blame(&s->blame);
6360 		s->done = 0;
6361 		if (thread_err)
6362 			break;
6363 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6364 		got_object_qid_free(s->blamed_commit);
6365 		s->blamed_commit =
6366 		    STAILQ_FIRST(&s->blamed_commits);
6367 		err = run_blame(view);
6368 		if (err)
6369 			break;
6370 		break;
6371 	}
6372 	case 'L':
6373 		view->count = 0;
6374 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6375 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6376 		if (s->id_to_log)
6377 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6378 		break;
6379 	case KEY_ENTER:
6380 	case '\r': {
6381 		struct got_object_id *id = NULL;
6382 		struct got_object_qid *pid;
6383 		struct got_commit_object *commit = NULL;
6384 
6385 		view->count = 0;
6386 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6387 		    s->first_displayed_line, s->selected_line);
6388 		if (id == NULL)
6389 			break;
6390 		err = got_object_open_as_commit(&commit, s->repo, id);
6391 		if (err)
6392 			break;
6393 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6394 		if (*new_view) {
6395 			/* traversed from diff view, release diff resources  */
6396 			err = close_diff_view(*new_view);
6397 			if (err)
6398 				break;
6399 			diff_view = *new_view;
6400 		} else {
6401 			if (view_is_parent_view(view))
6402 				view_get_split(view, &begin_y, &begin_x);
6403 
6404 			diff_view = view_open(0, 0, begin_y, begin_x,
6405 			    TOG_VIEW_DIFF);
6406 			if (diff_view == NULL) {
6407 				got_object_commit_close(commit);
6408 				err = got_error_from_errno("view_open");
6409 				break;
6410 			}
6411 		}
6412 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6413 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6414 		got_object_commit_close(commit);
6415 		if (err) {
6416 			view_close(diff_view);
6417 			break;
6418 		}
6419 		s->last_diffed_line = s->first_displayed_line - 1 +
6420 		    s->selected_line;
6421 		if (*new_view)
6422 			break;	/* still open from active diff view */
6423 		if (view_is_parent_view(view) &&
6424 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6425 			err = view_init_hsplit(view, begin_y);
6426 			if (err)
6427 				break;
6428 		}
6429 
6430 		view->focussed = 0;
6431 		diff_view->focussed = 1;
6432 		diff_view->mode = view->mode;
6433 		diff_view->nlines = view->lines - begin_y;
6434 		if (view_is_parent_view(view)) {
6435 			view_transfer_size(diff_view, view);
6436 			err = view_close_child(view);
6437 			if (err)
6438 				break;
6439 			err = view_set_child(view, diff_view);
6440 			if (err)
6441 				break;
6442 			view->focus_child = 1;
6443 		} else
6444 			*new_view = diff_view;
6445 		if (err)
6446 			break;
6447 		break;
6448 	}
6449 	case CTRL('d'):
6450 	case 'd':
6451 		nscroll /= 2;
6452 		/* FALL THROUGH */
6453 	case KEY_NPAGE:
6454 	case CTRL('f'):
6455 	case 'f':
6456 	case ' ':
6457 		if (s->last_displayed_line >= s->blame.nlines &&
6458 		    s->selected_line >= MIN(s->blame.nlines,
6459 		    view->nlines - 2)) {
6460 			view->count = 0;
6461 			break;
6462 		}
6463 		if (s->last_displayed_line >= s->blame.nlines &&
6464 		    s->selected_line < view->nlines - 2) {
6465 			s->selected_line +=
6466 			    MIN(nscroll, s->last_displayed_line -
6467 			    s->first_displayed_line - s->selected_line + 1);
6468 		}
6469 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6470 			s->first_displayed_line += nscroll;
6471 		else
6472 			s->first_displayed_line =
6473 			    s->blame.nlines - (view->nlines - 3);
6474 		break;
6475 	case KEY_RESIZE:
6476 		if (s->selected_line > view->nlines - 2) {
6477 			s->selected_line = MIN(s->blame.nlines,
6478 			    view->nlines - 2);
6479 		}
6480 		break;
6481 	default:
6482 		view->count = 0;
6483 		break;
6484 	}
6485 	return thread_err ? thread_err : err;
6486 }
6487 
6488 static const struct got_error *
6489 reset_blame_view(struct tog_view *view)
6490 {
6491 	const struct got_error *err;
6492 	struct tog_blame_view_state *s = &view->state.blame;
6493 
6494 	view->count = 0;
6495 	s->done = 1;
6496 	err = stop_blame(&s->blame);
6497 	s->done = 0;
6498 	if (err)
6499 		return err;
6500 	return run_blame(view);
6501 }
6502 
6503 static const struct got_error *
6504 cmd_blame(int argc, char *argv[])
6505 {
6506 	const struct got_error *error;
6507 	struct got_repository *repo = NULL;
6508 	struct got_worktree *worktree = NULL;
6509 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6510 	char *link_target = NULL;
6511 	struct got_object_id *commit_id = NULL;
6512 	struct got_commit_object *commit = NULL;
6513 	char *commit_id_str = NULL;
6514 	int ch;
6515 	struct tog_view *view;
6516 	int *pack_fds = NULL;
6517 
6518 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6519 		switch (ch) {
6520 		case 'c':
6521 			commit_id_str = optarg;
6522 			break;
6523 		case 'r':
6524 			repo_path = realpath(optarg, NULL);
6525 			if (repo_path == NULL)
6526 				return got_error_from_errno2("realpath",
6527 				    optarg);
6528 			break;
6529 		default:
6530 			usage_blame();
6531 			/* NOTREACHED */
6532 		}
6533 	}
6534 
6535 	argc -= optind;
6536 	argv += optind;
6537 
6538 	if (argc != 1)
6539 		usage_blame();
6540 
6541 	error = got_repo_pack_fds_open(&pack_fds);
6542 	if (error != NULL)
6543 		goto done;
6544 
6545 	if (repo_path == NULL) {
6546 		cwd = getcwd(NULL, 0);
6547 		if (cwd == NULL)
6548 			return got_error_from_errno("getcwd");
6549 		error = got_worktree_open(&worktree, cwd);
6550 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6551 			goto done;
6552 		if (worktree)
6553 			repo_path =
6554 			    strdup(got_worktree_get_repo_path(worktree));
6555 		else
6556 			repo_path = strdup(cwd);
6557 		if (repo_path == NULL) {
6558 			error = got_error_from_errno("strdup");
6559 			goto done;
6560 		}
6561 	}
6562 
6563 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6564 	if (error != NULL)
6565 		goto done;
6566 
6567 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6568 	    worktree);
6569 	if (error)
6570 		goto done;
6571 
6572 	init_curses();
6573 
6574 	error = apply_unveil(got_repo_get_path(repo), NULL);
6575 	if (error)
6576 		goto done;
6577 
6578 	error = tog_load_refs(repo, 0);
6579 	if (error)
6580 		goto done;
6581 
6582 	if (commit_id_str == NULL) {
6583 		struct got_reference *head_ref;
6584 		error = got_ref_open(&head_ref, repo, worktree ?
6585 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6586 		if (error != NULL)
6587 			goto done;
6588 		error = got_ref_resolve(&commit_id, repo, head_ref);
6589 		got_ref_close(head_ref);
6590 	} else {
6591 		error = got_repo_match_object_id(&commit_id, NULL,
6592 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6593 	}
6594 	if (error != NULL)
6595 		goto done;
6596 
6597 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6598 	if (view == NULL) {
6599 		error = got_error_from_errno("view_open");
6600 		goto done;
6601 	}
6602 
6603 	error = got_object_open_as_commit(&commit, repo, commit_id);
6604 	if (error)
6605 		goto done;
6606 
6607 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6608 	    commit, repo);
6609 	if (error)
6610 		goto done;
6611 
6612 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6613 	    commit_id, repo);
6614 	if (error)
6615 		goto done;
6616 	if (worktree) {
6617 		/* Release work tree lock. */
6618 		got_worktree_close(worktree);
6619 		worktree = NULL;
6620 	}
6621 	error = view_loop(view);
6622 done:
6623 	free(repo_path);
6624 	free(in_repo_path);
6625 	free(link_target);
6626 	free(cwd);
6627 	free(commit_id);
6628 	if (commit)
6629 		got_object_commit_close(commit);
6630 	if (worktree)
6631 		got_worktree_close(worktree);
6632 	if (repo) {
6633 		const struct got_error *close_err = got_repo_close(repo);
6634 		if (error == NULL)
6635 			error = close_err;
6636 	}
6637 	if (pack_fds) {
6638 		const struct got_error *pack_err =
6639 		    got_repo_pack_fds_close(pack_fds);
6640 		if (error == NULL)
6641 			error = pack_err;
6642 	}
6643 	tog_free_refs();
6644 	return error;
6645 }
6646 
6647 static const struct got_error *
6648 draw_tree_entries(struct tog_view *view, const char *parent_path)
6649 {
6650 	struct tog_tree_view_state *s = &view->state.tree;
6651 	const struct got_error *err = NULL;
6652 	struct got_tree_entry *te;
6653 	wchar_t *wline;
6654 	char *index = NULL;
6655 	struct tog_color *tc;
6656 	int width, n, nentries, i = 1;
6657 	int limit = view->nlines;
6658 
6659 	s->ndisplayed = 0;
6660 	if (view_is_hsplit_top(view))
6661 		--limit;  /* border */
6662 
6663 	werase(view->window);
6664 
6665 	if (limit == 0)
6666 		return NULL;
6667 
6668 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6669 	    0, 0);
6670 	if (err)
6671 		return err;
6672 	if (view_needs_focus_indication(view))
6673 		wstandout(view->window);
6674 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6675 	if (tc)
6676 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6677 	waddwstr(view->window, wline);
6678 	free(wline);
6679 	wline = NULL;
6680 	while (width++ < view->ncols)
6681 		waddch(view->window, ' ');
6682 	if (tc)
6683 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6684 	if (view_needs_focus_indication(view))
6685 		wstandend(view->window);
6686 	if (--limit <= 0)
6687 		return NULL;
6688 
6689 	i += s->selected;
6690 	if (s->first_displayed_entry) {
6691 		i += got_tree_entry_get_index(s->first_displayed_entry);
6692 		if (s->tree != s->root)
6693 			++i;  /* account for ".." entry */
6694 	}
6695 	nentries = got_object_tree_get_nentries(s->tree);
6696 	if (asprintf(&index, "[%d/%d] %s",
6697 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6698 		return got_error_from_errno("asprintf");
6699 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6700 	free(index);
6701 	if (err)
6702 		return err;
6703 	waddwstr(view->window, wline);
6704 	free(wline);
6705 	wline = NULL;
6706 	if (width < view->ncols - 1)
6707 		waddch(view->window, '\n');
6708 	if (--limit <= 0)
6709 		return NULL;
6710 	waddch(view->window, '\n');
6711 	if (--limit <= 0)
6712 		return NULL;
6713 
6714 	if (s->first_displayed_entry == NULL) {
6715 		te = got_object_tree_get_first_entry(s->tree);
6716 		if (s->selected == 0) {
6717 			if (view->focussed)
6718 				wstandout(view->window);
6719 			s->selected_entry = NULL;
6720 		}
6721 		waddstr(view->window, "  ..\n");	/* parent directory */
6722 		if (s->selected == 0 && view->focussed)
6723 			wstandend(view->window);
6724 		s->ndisplayed++;
6725 		if (--limit <= 0)
6726 			return NULL;
6727 		n = 1;
6728 	} else {
6729 		n = 0;
6730 		te = s->first_displayed_entry;
6731 	}
6732 
6733 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6734 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6735 		const char *modestr = "";
6736 		mode_t mode;
6737 
6738 		te = got_object_tree_get_entry(s->tree, i);
6739 		mode = got_tree_entry_get_mode(te);
6740 
6741 		if (s->show_ids) {
6742 			err = got_object_id_str(&id_str,
6743 			    got_tree_entry_get_id(te));
6744 			if (err)
6745 				return got_error_from_errno(
6746 				    "got_object_id_str");
6747 		}
6748 		if (got_object_tree_entry_is_submodule(te))
6749 			modestr = "$";
6750 		else if (S_ISLNK(mode)) {
6751 			int i;
6752 
6753 			err = got_tree_entry_get_symlink_target(&link_target,
6754 			    te, s->repo);
6755 			if (err) {
6756 				free(id_str);
6757 				return err;
6758 			}
6759 			for (i = 0; i < strlen(link_target); i++) {
6760 				if (!isprint((unsigned char)link_target[i]))
6761 					link_target[i] = '?';
6762 			}
6763 			modestr = "@";
6764 		}
6765 		else if (S_ISDIR(mode))
6766 			modestr = "/";
6767 		else if (mode & S_IXUSR)
6768 			modestr = "*";
6769 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6770 		    got_tree_entry_get_name(te), modestr,
6771 		    link_target ? " -> ": "",
6772 		    link_target ? link_target : "") == -1) {
6773 			free(id_str);
6774 			free(link_target);
6775 			return got_error_from_errno("asprintf");
6776 		}
6777 		free(id_str);
6778 		free(link_target);
6779 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6780 		    0, 0);
6781 		if (err) {
6782 			free(line);
6783 			break;
6784 		}
6785 		if (n == s->selected) {
6786 			if (view->focussed)
6787 				wstandout(view->window);
6788 			s->selected_entry = te;
6789 		}
6790 		tc = match_color(&s->colors, line);
6791 		if (tc)
6792 			wattr_on(view->window,
6793 			    COLOR_PAIR(tc->colorpair), NULL);
6794 		waddwstr(view->window, wline);
6795 		if (tc)
6796 			wattr_off(view->window,
6797 			    COLOR_PAIR(tc->colorpair), NULL);
6798 		if (width < view->ncols - 1)
6799 			waddch(view->window, '\n');
6800 		if (n == s->selected && view->focussed)
6801 			wstandend(view->window);
6802 		free(line);
6803 		free(wline);
6804 		wline = NULL;
6805 		n++;
6806 		s->ndisplayed++;
6807 		s->last_displayed_entry = te;
6808 		if (--limit <= 0)
6809 			break;
6810 	}
6811 
6812 	return err;
6813 }
6814 
6815 static void
6816 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6817 {
6818 	struct got_tree_entry *te;
6819 	int isroot = s->tree == s->root;
6820 	int i = 0;
6821 
6822 	if (s->first_displayed_entry == NULL)
6823 		return;
6824 
6825 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6826 	while (i++ < maxscroll) {
6827 		if (te == NULL) {
6828 			if (!isroot)
6829 				s->first_displayed_entry = NULL;
6830 			break;
6831 		}
6832 		s->first_displayed_entry = te;
6833 		te = got_tree_entry_get_prev(s->tree, te);
6834 	}
6835 }
6836 
6837 static const struct got_error *
6838 tree_scroll_down(struct tog_view *view, int maxscroll)
6839 {
6840 	struct tog_tree_view_state *s = &view->state.tree;
6841 	struct got_tree_entry *next, *last;
6842 	int n = 0;
6843 
6844 	if (s->first_displayed_entry)
6845 		next = got_tree_entry_get_next(s->tree,
6846 		    s->first_displayed_entry);
6847 	else
6848 		next = got_object_tree_get_first_entry(s->tree);
6849 
6850 	last = s->last_displayed_entry;
6851 	while (next && n++ < maxscroll) {
6852 		if (last) {
6853 			s->last_displayed_entry = last;
6854 			last = got_tree_entry_get_next(s->tree, last);
6855 		}
6856 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6857 			s->first_displayed_entry = next;
6858 			next = got_tree_entry_get_next(s->tree, next);
6859 		}
6860 	}
6861 
6862 	return NULL;
6863 }
6864 
6865 static const struct got_error *
6866 tree_entry_path(char **path, struct tog_parent_trees *parents,
6867     struct got_tree_entry *te)
6868 {
6869 	const struct got_error *err = NULL;
6870 	struct tog_parent_tree *pt;
6871 	size_t len = 2; /* for leading slash and NUL */
6872 
6873 	TAILQ_FOREACH(pt, parents, entry)
6874 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6875 		    + 1 /* slash */;
6876 	if (te)
6877 		len += strlen(got_tree_entry_get_name(te));
6878 
6879 	*path = calloc(1, len);
6880 	if (path == NULL)
6881 		return got_error_from_errno("calloc");
6882 
6883 	(*path)[0] = '/';
6884 	pt = TAILQ_LAST(parents, tog_parent_trees);
6885 	while (pt) {
6886 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6887 		if (strlcat(*path, name, len) >= len) {
6888 			err = got_error(GOT_ERR_NO_SPACE);
6889 			goto done;
6890 		}
6891 		if (strlcat(*path, "/", len) >= len) {
6892 			err = got_error(GOT_ERR_NO_SPACE);
6893 			goto done;
6894 		}
6895 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6896 	}
6897 	if (te) {
6898 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6899 			err = got_error(GOT_ERR_NO_SPACE);
6900 			goto done;
6901 		}
6902 	}
6903 done:
6904 	if (err) {
6905 		free(*path);
6906 		*path = NULL;
6907 	}
6908 	return err;
6909 }
6910 
6911 static const struct got_error *
6912 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6913     struct got_tree_entry *te, struct tog_parent_trees *parents,
6914     struct got_object_id *commit_id, struct got_repository *repo)
6915 {
6916 	const struct got_error *err = NULL;
6917 	char *path;
6918 	struct tog_view *blame_view;
6919 
6920 	*new_view = NULL;
6921 
6922 	err = tree_entry_path(&path, parents, te);
6923 	if (err)
6924 		return err;
6925 
6926 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6927 	if (blame_view == NULL) {
6928 		err = got_error_from_errno("view_open");
6929 		goto done;
6930 	}
6931 
6932 	err = open_blame_view(blame_view, path, commit_id, repo);
6933 	if (err) {
6934 		if (err->code == GOT_ERR_CANCELLED)
6935 			err = NULL;
6936 		view_close(blame_view);
6937 	} else
6938 		*new_view = blame_view;
6939 done:
6940 	free(path);
6941 	return err;
6942 }
6943 
6944 static const struct got_error *
6945 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6946     struct tog_tree_view_state *s)
6947 {
6948 	struct tog_view *log_view;
6949 	const struct got_error *err = NULL;
6950 	char *path;
6951 
6952 	*new_view = NULL;
6953 
6954 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6955 	if (log_view == NULL)
6956 		return got_error_from_errno("view_open");
6957 
6958 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6959 	if (err)
6960 		return err;
6961 
6962 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6963 	    path, 0);
6964 	if (err)
6965 		view_close(log_view);
6966 	else
6967 		*new_view = log_view;
6968 	free(path);
6969 	return err;
6970 }
6971 
6972 static const struct got_error *
6973 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6974     const char *head_ref_name, struct got_repository *repo)
6975 {
6976 	const struct got_error *err = NULL;
6977 	char *commit_id_str = NULL;
6978 	struct tog_tree_view_state *s = &view->state.tree;
6979 	struct got_commit_object *commit = NULL;
6980 
6981 	TAILQ_INIT(&s->parents);
6982 	STAILQ_INIT(&s->colors);
6983 
6984 	s->commit_id = got_object_id_dup(commit_id);
6985 	if (s->commit_id == NULL)
6986 		return got_error_from_errno("got_object_id_dup");
6987 
6988 	err = got_object_open_as_commit(&commit, repo, commit_id);
6989 	if (err)
6990 		goto done;
6991 
6992 	/*
6993 	 * The root is opened here and will be closed when the view is closed.
6994 	 * Any visited subtrees and their path-wise parents are opened and
6995 	 * closed on demand.
6996 	 */
6997 	err = got_object_open_as_tree(&s->root, repo,
6998 	    got_object_commit_get_tree_id(commit));
6999 	if (err)
7000 		goto done;
7001 	s->tree = s->root;
7002 
7003 	err = got_object_id_str(&commit_id_str, commit_id);
7004 	if (err != NULL)
7005 		goto done;
7006 
7007 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7008 		err = got_error_from_errno("asprintf");
7009 		goto done;
7010 	}
7011 
7012 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7013 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7014 	if (head_ref_name) {
7015 		s->head_ref_name = strdup(head_ref_name);
7016 		if (s->head_ref_name == NULL) {
7017 			err = got_error_from_errno("strdup");
7018 			goto done;
7019 		}
7020 	}
7021 	s->repo = repo;
7022 
7023 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7024 		err = add_color(&s->colors, "\\$$",
7025 		    TOG_COLOR_TREE_SUBMODULE,
7026 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7027 		if (err)
7028 			goto done;
7029 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7030 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7031 		if (err)
7032 			goto done;
7033 		err = add_color(&s->colors, "/$",
7034 		    TOG_COLOR_TREE_DIRECTORY,
7035 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7036 		if (err)
7037 			goto done;
7038 
7039 		err = add_color(&s->colors, "\\*$",
7040 		    TOG_COLOR_TREE_EXECUTABLE,
7041 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7042 		if (err)
7043 			goto done;
7044 
7045 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7046 		    get_color_value("TOG_COLOR_COMMIT"));
7047 		if (err)
7048 			goto done;
7049 	}
7050 
7051 	view->show = show_tree_view;
7052 	view->input = input_tree_view;
7053 	view->close = close_tree_view;
7054 	view->search_start = search_start_tree_view;
7055 	view->search_next = search_next_tree_view;
7056 done:
7057 	free(commit_id_str);
7058 	if (commit)
7059 		got_object_commit_close(commit);
7060 	if (err)
7061 		close_tree_view(view);
7062 	return err;
7063 }
7064 
7065 static const struct got_error *
7066 close_tree_view(struct tog_view *view)
7067 {
7068 	struct tog_tree_view_state *s = &view->state.tree;
7069 
7070 	free_colors(&s->colors);
7071 	free(s->tree_label);
7072 	s->tree_label = NULL;
7073 	free(s->commit_id);
7074 	s->commit_id = NULL;
7075 	free(s->head_ref_name);
7076 	s->head_ref_name = NULL;
7077 	while (!TAILQ_EMPTY(&s->parents)) {
7078 		struct tog_parent_tree *parent;
7079 		parent = TAILQ_FIRST(&s->parents);
7080 		TAILQ_REMOVE(&s->parents, parent, entry);
7081 		if (parent->tree != s->root)
7082 			got_object_tree_close(parent->tree);
7083 		free(parent);
7084 
7085 	}
7086 	if (s->tree != NULL && s->tree != s->root)
7087 		got_object_tree_close(s->tree);
7088 	if (s->root)
7089 		got_object_tree_close(s->root);
7090 	return NULL;
7091 }
7092 
7093 static const struct got_error *
7094 search_start_tree_view(struct tog_view *view)
7095 {
7096 	struct tog_tree_view_state *s = &view->state.tree;
7097 
7098 	s->matched_entry = NULL;
7099 	return NULL;
7100 }
7101 
7102 static int
7103 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7104 {
7105 	regmatch_t regmatch;
7106 
7107 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7108 	    0) == 0;
7109 }
7110 
7111 static const struct got_error *
7112 search_next_tree_view(struct tog_view *view)
7113 {
7114 	struct tog_tree_view_state *s = &view->state.tree;
7115 	struct got_tree_entry *te = NULL;
7116 
7117 	if (!view->searching) {
7118 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7119 		return NULL;
7120 	}
7121 
7122 	if (s->matched_entry) {
7123 		if (view->searching == TOG_SEARCH_FORWARD) {
7124 			if (s->selected_entry)
7125 				te = got_tree_entry_get_next(s->tree,
7126 				    s->selected_entry);
7127 			else
7128 				te = got_object_tree_get_first_entry(s->tree);
7129 		} else {
7130 			if (s->selected_entry == NULL)
7131 				te = got_object_tree_get_last_entry(s->tree);
7132 			else
7133 				te = got_tree_entry_get_prev(s->tree,
7134 				    s->selected_entry);
7135 		}
7136 	} else {
7137 		if (s->selected_entry)
7138 			te = s->selected_entry;
7139 		else if (view->searching == TOG_SEARCH_FORWARD)
7140 			te = got_object_tree_get_first_entry(s->tree);
7141 		else
7142 			te = got_object_tree_get_last_entry(s->tree);
7143 	}
7144 
7145 	while (1) {
7146 		if (te == NULL) {
7147 			if (s->matched_entry == NULL) {
7148 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7149 				return NULL;
7150 			}
7151 			if (view->searching == TOG_SEARCH_FORWARD)
7152 				te = got_object_tree_get_first_entry(s->tree);
7153 			else
7154 				te = got_object_tree_get_last_entry(s->tree);
7155 		}
7156 
7157 		if (match_tree_entry(te, &view->regex)) {
7158 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7159 			s->matched_entry = te;
7160 			break;
7161 		}
7162 
7163 		if (view->searching == TOG_SEARCH_FORWARD)
7164 			te = got_tree_entry_get_next(s->tree, te);
7165 		else
7166 			te = got_tree_entry_get_prev(s->tree, te);
7167 	}
7168 
7169 	if (s->matched_entry) {
7170 		s->first_displayed_entry = s->matched_entry;
7171 		s->selected = 0;
7172 	}
7173 
7174 	return NULL;
7175 }
7176 
7177 static const struct got_error *
7178 show_tree_view(struct tog_view *view)
7179 {
7180 	const struct got_error *err = NULL;
7181 	struct tog_tree_view_state *s = &view->state.tree;
7182 	char *parent_path;
7183 
7184 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7185 	if (err)
7186 		return err;
7187 
7188 	err = draw_tree_entries(view, parent_path);
7189 	free(parent_path);
7190 
7191 	view_border(view);
7192 	return err;
7193 }
7194 
7195 static const struct got_error *
7196 tree_goto_line(struct tog_view *view, int nlines)
7197 {
7198 	const struct got_error		 *err = NULL;
7199 	struct tog_tree_view_state	 *s = &view->state.tree;
7200 	struct got_tree_entry		**fte, **lte, **ste;
7201 	int				  g, last, first = 1, i = 1;
7202 	int				  root = s->tree == s->root;
7203 	int				  off = root ? 1 : 2;
7204 
7205 	g = view->gline;
7206 	view->gline = 0;
7207 
7208 	if (g == 0)
7209 		g = 1;
7210 	else if (g > got_object_tree_get_nentries(s->tree))
7211 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7212 
7213 	fte = &s->first_displayed_entry;
7214 	lte = &s->last_displayed_entry;
7215 	ste = &s->selected_entry;
7216 
7217 	if (*fte != NULL) {
7218 		first = got_tree_entry_get_index(*fte);
7219 		first += off;  /* account for ".." */
7220 	}
7221 	last = got_tree_entry_get_index(*lte);
7222 	last += off;
7223 
7224 	if (g >= first && g <= last && g - first < nlines) {
7225 		s->selected = g - first;
7226 		return NULL;	/* gline is on the current page */
7227 	}
7228 
7229 	if (*ste != NULL) {
7230 		i = got_tree_entry_get_index(*ste);
7231 		i += off;
7232 	}
7233 
7234 	if (i < g) {
7235 		err = tree_scroll_down(view, g - i);
7236 		if (err)
7237 			return err;
7238 		if (got_tree_entry_get_index(*lte) >=
7239 		    got_object_tree_get_nentries(s->tree) - 1 &&
7240 		    first + s->selected < g &&
7241 		    s->selected < s->ndisplayed - 1) {
7242 			first = got_tree_entry_get_index(*fte);
7243 			first += off;
7244 			s->selected = g - first;
7245 		}
7246 	} else if (i > g)
7247 		tree_scroll_up(s, i - g);
7248 
7249 	if (g < nlines &&
7250 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7251 		s->selected = g - 1;
7252 
7253 	return NULL;
7254 }
7255 
7256 static const struct got_error *
7257 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7258 {
7259 	const struct got_error *err = NULL;
7260 	struct tog_tree_view_state *s = &view->state.tree;
7261 	struct got_tree_entry *te;
7262 	int n, nscroll = view->nlines - 3;
7263 
7264 	if (view->gline)
7265 		return tree_goto_line(view, nscroll);
7266 
7267 	switch (ch) {
7268 	case 'i':
7269 		s->show_ids = !s->show_ids;
7270 		view->count = 0;
7271 		break;
7272 	case 'L':
7273 		view->count = 0;
7274 		if (!s->selected_entry)
7275 			break;
7276 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7277 		break;
7278 	case 'R':
7279 		view->count = 0;
7280 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7281 		break;
7282 	case 'g':
7283 	case KEY_HOME:
7284 		s->selected = 0;
7285 		view->count = 0;
7286 		if (s->tree == s->root)
7287 			s->first_displayed_entry =
7288 			    got_object_tree_get_first_entry(s->tree);
7289 		else
7290 			s->first_displayed_entry = NULL;
7291 		break;
7292 	case 'G':
7293 	case KEY_END: {
7294 		int eos = view->nlines - 3;
7295 
7296 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7297 			--eos;  /* border */
7298 		s->selected = 0;
7299 		view->count = 0;
7300 		te = got_object_tree_get_last_entry(s->tree);
7301 		for (n = 0; n < eos; n++) {
7302 			if (te == NULL) {
7303 				if (s->tree != s->root) {
7304 					s->first_displayed_entry = NULL;
7305 					n++;
7306 				}
7307 				break;
7308 			}
7309 			s->first_displayed_entry = te;
7310 			te = got_tree_entry_get_prev(s->tree, te);
7311 		}
7312 		if (n > 0)
7313 			s->selected = n - 1;
7314 		break;
7315 	}
7316 	case 'k':
7317 	case KEY_UP:
7318 	case CTRL('p'):
7319 		if (s->selected > 0) {
7320 			s->selected--;
7321 			break;
7322 		}
7323 		tree_scroll_up(s, 1);
7324 		if (s->selected_entry == NULL ||
7325 		    (s->tree == s->root && s->selected_entry ==
7326 		     got_object_tree_get_first_entry(s->tree)))
7327 			view->count = 0;
7328 		break;
7329 	case CTRL('u'):
7330 	case 'u':
7331 		nscroll /= 2;
7332 		/* FALL THROUGH */
7333 	case KEY_PPAGE:
7334 	case CTRL('b'):
7335 	case 'b':
7336 		if (s->tree == s->root) {
7337 			if (got_object_tree_get_first_entry(s->tree) ==
7338 			    s->first_displayed_entry)
7339 				s->selected -= MIN(s->selected, nscroll);
7340 		} else {
7341 			if (s->first_displayed_entry == NULL)
7342 				s->selected -= MIN(s->selected, nscroll);
7343 		}
7344 		tree_scroll_up(s, MAX(0, nscroll));
7345 		if (s->selected_entry == NULL ||
7346 		    (s->tree == s->root && s->selected_entry ==
7347 		     got_object_tree_get_first_entry(s->tree)))
7348 			view->count = 0;
7349 		break;
7350 	case 'j':
7351 	case KEY_DOWN:
7352 	case CTRL('n'):
7353 		if (s->selected < s->ndisplayed - 1) {
7354 			s->selected++;
7355 			break;
7356 		}
7357 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7358 		    == NULL) {
7359 			/* can't scroll any further */
7360 			view->count = 0;
7361 			break;
7362 		}
7363 		tree_scroll_down(view, 1);
7364 		break;
7365 	case CTRL('d'):
7366 	case 'd':
7367 		nscroll /= 2;
7368 		/* FALL THROUGH */
7369 	case KEY_NPAGE:
7370 	case CTRL('f'):
7371 	case 'f':
7372 	case ' ':
7373 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7374 		    == NULL) {
7375 			/* can't scroll any further; move cursor down */
7376 			if (s->selected < s->ndisplayed - 1)
7377 				s->selected += MIN(nscroll,
7378 				    s->ndisplayed - s->selected - 1);
7379 			else
7380 				view->count = 0;
7381 			break;
7382 		}
7383 		tree_scroll_down(view, nscroll);
7384 		break;
7385 	case KEY_ENTER:
7386 	case '\r':
7387 	case KEY_BACKSPACE:
7388 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7389 			struct tog_parent_tree *parent;
7390 			/* user selected '..' */
7391 			if (s->tree == s->root) {
7392 				view->count = 0;
7393 				break;
7394 			}
7395 			parent = TAILQ_FIRST(&s->parents);
7396 			TAILQ_REMOVE(&s->parents, parent,
7397 			    entry);
7398 			got_object_tree_close(s->tree);
7399 			s->tree = parent->tree;
7400 			s->first_displayed_entry =
7401 			    parent->first_displayed_entry;
7402 			s->selected_entry =
7403 			    parent->selected_entry;
7404 			s->selected = parent->selected;
7405 			if (s->selected > view->nlines - 3) {
7406 				err = offset_selection_down(view);
7407 				if (err)
7408 					break;
7409 			}
7410 			free(parent);
7411 		} else if (S_ISDIR(got_tree_entry_get_mode(
7412 		    s->selected_entry))) {
7413 			struct got_tree_object *subtree;
7414 			view->count = 0;
7415 			err = got_object_open_as_tree(&subtree, s->repo,
7416 			    got_tree_entry_get_id(s->selected_entry));
7417 			if (err)
7418 				break;
7419 			err = tree_view_visit_subtree(s, subtree);
7420 			if (err) {
7421 				got_object_tree_close(subtree);
7422 				break;
7423 			}
7424 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7425 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7426 		break;
7427 	case KEY_RESIZE:
7428 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7429 			s->selected = view->nlines - 4;
7430 		view->count = 0;
7431 		break;
7432 	default:
7433 		view->count = 0;
7434 		break;
7435 	}
7436 
7437 	return err;
7438 }
7439 
7440 __dead static void
7441 usage_tree(void)
7442 {
7443 	endwin();
7444 	fprintf(stderr,
7445 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7446 	    getprogname());
7447 	exit(1);
7448 }
7449 
7450 static const struct got_error *
7451 cmd_tree(int argc, char *argv[])
7452 {
7453 	const struct got_error *error;
7454 	struct got_repository *repo = NULL;
7455 	struct got_worktree *worktree = NULL;
7456 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7457 	struct got_object_id *commit_id = NULL;
7458 	struct got_commit_object *commit = NULL;
7459 	const char *commit_id_arg = NULL;
7460 	char *label = NULL;
7461 	struct got_reference *ref = NULL;
7462 	const char *head_ref_name = NULL;
7463 	int ch;
7464 	struct tog_view *view;
7465 	int *pack_fds = NULL;
7466 
7467 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7468 		switch (ch) {
7469 		case 'c':
7470 			commit_id_arg = optarg;
7471 			break;
7472 		case 'r':
7473 			repo_path = realpath(optarg, NULL);
7474 			if (repo_path == NULL)
7475 				return got_error_from_errno2("realpath",
7476 				    optarg);
7477 			break;
7478 		default:
7479 			usage_tree();
7480 			/* NOTREACHED */
7481 		}
7482 	}
7483 
7484 	argc -= optind;
7485 	argv += optind;
7486 
7487 	if (argc > 1)
7488 		usage_tree();
7489 
7490 	error = got_repo_pack_fds_open(&pack_fds);
7491 	if (error != NULL)
7492 		goto done;
7493 
7494 	if (repo_path == NULL) {
7495 		cwd = getcwd(NULL, 0);
7496 		if (cwd == NULL)
7497 			return got_error_from_errno("getcwd");
7498 		error = got_worktree_open(&worktree, cwd);
7499 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7500 			goto done;
7501 		if (worktree)
7502 			repo_path =
7503 			    strdup(got_worktree_get_repo_path(worktree));
7504 		else
7505 			repo_path = strdup(cwd);
7506 		if (repo_path == NULL) {
7507 			error = got_error_from_errno("strdup");
7508 			goto done;
7509 		}
7510 	}
7511 
7512 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7513 	if (error != NULL)
7514 		goto done;
7515 
7516 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7517 	    repo, worktree);
7518 	if (error)
7519 		goto done;
7520 
7521 	init_curses();
7522 
7523 	error = apply_unveil(got_repo_get_path(repo), NULL);
7524 	if (error)
7525 		goto done;
7526 
7527 	error = tog_load_refs(repo, 0);
7528 	if (error)
7529 		goto done;
7530 
7531 	if (commit_id_arg == NULL) {
7532 		error = got_repo_match_object_id(&commit_id, &label,
7533 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7534 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7535 		if (error)
7536 			goto done;
7537 		head_ref_name = label;
7538 	} else {
7539 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7540 		if (error == NULL)
7541 			head_ref_name = got_ref_get_name(ref);
7542 		else if (error->code != GOT_ERR_NOT_REF)
7543 			goto done;
7544 		error = got_repo_match_object_id(&commit_id, NULL,
7545 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7546 		if (error)
7547 			goto done;
7548 	}
7549 
7550 	error = got_object_open_as_commit(&commit, repo, commit_id);
7551 	if (error)
7552 		goto done;
7553 
7554 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7555 	if (view == NULL) {
7556 		error = got_error_from_errno("view_open");
7557 		goto done;
7558 	}
7559 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7560 	if (error)
7561 		goto done;
7562 	if (!got_path_is_root_dir(in_repo_path)) {
7563 		error = tree_view_walk_path(&view->state.tree, commit,
7564 		    in_repo_path);
7565 		if (error)
7566 			goto done;
7567 	}
7568 
7569 	if (worktree) {
7570 		/* Release work tree lock. */
7571 		got_worktree_close(worktree);
7572 		worktree = NULL;
7573 	}
7574 	error = view_loop(view);
7575 done:
7576 	free(repo_path);
7577 	free(cwd);
7578 	free(commit_id);
7579 	free(label);
7580 	if (ref)
7581 		got_ref_close(ref);
7582 	if (repo) {
7583 		const struct got_error *close_err = got_repo_close(repo);
7584 		if (error == NULL)
7585 			error = close_err;
7586 	}
7587 	if (pack_fds) {
7588 		const struct got_error *pack_err =
7589 		    got_repo_pack_fds_close(pack_fds);
7590 		if (error == NULL)
7591 			error = pack_err;
7592 	}
7593 	tog_free_refs();
7594 	return error;
7595 }
7596 
7597 static const struct got_error *
7598 ref_view_load_refs(struct tog_ref_view_state *s)
7599 {
7600 	struct got_reflist_entry *sre;
7601 	struct tog_reflist_entry *re;
7602 
7603 	s->nrefs = 0;
7604 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7605 		if (strncmp(got_ref_get_name(sre->ref),
7606 		    "refs/got/", 9) == 0 &&
7607 		    strncmp(got_ref_get_name(sre->ref),
7608 		    "refs/got/backup/", 16) != 0)
7609 			continue;
7610 
7611 		re = malloc(sizeof(*re));
7612 		if (re == NULL)
7613 			return got_error_from_errno("malloc");
7614 
7615 		re->ref = got_ref_dup(sre->ref);
7616 		if (re->ref == NULL)
7617 			return got_error_from_errno("got_ref_dup");
7618 		re->idx = s->nrefs++;
7619 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7620 	}
7621 
7622 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7623 	return NULL;
7624 }
7625 
7626 static void
7627 ref_view_free_refs(struct tog_ref_view_state *s)
7628 {
7629 	struct tog_reflist_entry *re;
7630 
7631 	while (!TAILQ_EMPTY(&s->refs)) {
7632 		re = TAILQ_FIRST(&s->refs);
7633 		TAILQ_REMOVE(&s->refs, re, entry);
7634 		got_ref_close(re->ref);
7635 		free(re);
7636 	}
7637 }
7638 
7639 static const struct got_error *
7640 open_ref_view(struct tog_view *view, struct got_repository *repo)
7641 {
7642 	const struct got_error *err = NULL;
7643 	struct tog_ref_view_state *s = &view->state.ref;
7644 
7645 	s->selected_entry = 0;
7646 	s->repo = repo;
7647 
7648 	TAILQ_INIT(&s->refs);
7649 	STAILQ_INIT(&s->colors);
7650 
7651 	err = ref_view_load_refs(s);
7652 	if (err)
7653 		return err;
7654 
7655 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7656 		err = add_color(&s->colors, "^refs/heads/",
7657 		    TOG_COLOR_REFS_HEADS,
7658 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7659 		if (err)
7660 			goto done;
7661 
7662 		err = add_color(&s->colors, "^refs/tags/",
7663 		    TOG_COLOR_REFS_TAGS,
7664 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7665 		if (err)
7666 			goto done;
7667 
7668 		err = add_color(&s->colors, "^refs/remotes/",
7669 		    TOG_COLOR_REFS_REMOTES,
7670 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7671 		if (err)
7672 			goto done;
7673 
7674 		err = add_color(&s->colors, "^refs/got/backup/",
7675 		    TOG_COLOR_REFS_BACKUP,
7676 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7677 		if (err)
7678 			goto done;
7679 	}
7680 
7681 	view->show = show_ref_view;
7682 	view->input = input_ref_view;
7683 	view->close = close_ref_view;
7684 	view->search_start = search_start_ref_view;
7685 	view->search_next = search_next_ref_view;
7686 done:
7687 	if (err)
7688 		free_colors(&s->colors);
7689 	return err;
7690 }
7691 
7692 static const struct got_error *
7693 close_ref_view(struct tog_view *view)
7694 {
7695 	struct tog_ref_view_state *s = &view->state.ref;
7696 
7697 	ref_view_free_refs(s);
7698 	free_colors(&s->colors);
7699 
7700 	return NULL;
7701 }
7702 
7703 static const struct got_error *
7704 resolve_reflist_entry(struct got_object_id **commit_id,
7705     struct tog_reflist_entry *re, struct got_repository *repo)
7706 {
7707 	const struct got_error *err = NULL;
7708 	struct got_object_id *obj_id;
7709 	struct got_tag_object *tag = NULL;
7710 	int obj_type;
7711 
7712 	*commit_id = NULL;
7713 
7714 	err = got_ref_resolve(&obj_id, repo, re->ref);
7715 	if (err)
7716 		return err;
7717 
7718 	err = got_object_get_type(&obj_type, repo, obj_id);
7719 	if (err)
7720 		goto done;
7721 
7722 	switch (obj_type) {
7723 	case GOT_OBJ_TYPE_COMMIT:
7724 		*commit_id = obj_id;
7725 		break;
7726 	case GOT_OBJ_TYPE_TAG:
7727 		err = got_object_open_as_tag(&tag, repo, obj_id);
7728 		if (err)
7729 			goto done;
7730 		free(obj_id);
7731 		err = got_object_get_type(&obj_type, repo,
7732 		    got_object_tag_get_object_id(tag));
7733 		if (err)
7734 			goto done;
7735 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7736 			err = got_error(GOT_ERR_OBJ_TYPE);
7737 			goto done;
7738 		}
7739 		*commit_id = got_object_id_dup(
7740 		    got_object_tag_get_object_id(tag));
7741 		if (*commit_id == NULL) {
7742 			err = got_error_from_errno("got_object_id_dup");
7743 			goto done;
7744 		}
7745 		break;
7746 	default:
7747 		err = got_error(GOT_ERR_OBJ_TYPE);
7748 		break;
7749 	}
7750 
7751 done:
7752 	if (tag)
7753 		got_object_tag_close(tag);
7754 	if (err) {
7755 		free(*commit_id);
7756 		*commit_id = NULL;
7757 	}
7758 	return err;
7759 }
7760 
7761 static const struct got_error *
7762 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7763     struct tog_reflist_entry *re, struct got_repository *repo)
7764 {
7765 	struct tog_view *log_view;
7766 	const struct got_error *err = NULL;
7767 	struct got_object_id *commit_id = NULL;
7768 
7769 	*new_view = NULL;
7770 
7771 	err = resolve_reflist_entry(&commit_id, re, repo);
7772 	if (err) {
7773 		if (err->code != GOT_ERR_OBJ_TYPE)
7774 			return err;
7775 		else
7776 			return NULL;
7777 	}
7778 
7779 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7780 	if (log_view == NULL) {
7781 		err = got_error_from_errno("view_open");
7782 		goto done;
7783 	}
7784 
7785 	err = open_log_view(log_view, commit_id, repo,
7786 	    got_ref_get_name(re->ref), "", 0);
7787 done:
7788 	if (err)
7789 		view_close(log_view);
7790 	else
7791 		*new_view = log_view;
7792 	free(commit_id);
7793 	return err;
7794 }
7795 
7796 static void
7797 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7798 {
7799 	struct tog_reflist_entry *re;
7800 	int i = 0;
7801 
7802 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7803 		return;
7804 
7805 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7806 	while (i++ < maxscroll) {
7807 		if (re == NULL)
7808 			break;
7809 		s->first_displayed_entry = re;
7810 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7811 	}
7812 }
7813 
7814 static const struct got_error *
7815 ref_scroll_down(struct tog_view *view, int maxscroll)
7816 {
7817 	struct tog_ref_view_state *s = &view->state.ref;
7818 	struct tog_reflist_entry *next, *last;
7819 	int n = 0;
7820 
7821 	if (s->first_displayed_entry)
7822 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7823 	else
7824 		next = TAILQ_FIRST(&s->refs);
7825 
7826 	last = s->last_displayed_entry;
7827 	while (next && n++ < maxscroll) {
7828 		if (last) {
7829 			s->last_displayed_entry = last;
7830 			last = TAILQ_NEXT(last, entry);
7831 		}
7832 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7833 			s->first_displayed_entry = next;
7834 			next = TAILQ_NEXT(next, entry);
7835 		}
7836 	}
7837 
7838 	return NULL;
7839 }
7840 
7841 static const struct got_error *
7842 search_start_ref_view(struct tog_view *view)
7843 {
7844 	struct tog_ref_view_state *s = &view->state.ref;
7845 
7846 	s->matched_entry = NULL;
7847 	return NULL;
7848 }
7849 
7850 static int
7851 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7852 {
7853 	regmatch_t regmatch;
7854 
7855 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7856 	    0) == 0;
7857 }
7858 
7859 static const struct got_error *
7860 search_next_ref_view(struct tog_view *view)
7861 {
7862 	struct tog_ref_view_state *s = &view->state.ref;
7863 	struct tog_reflist_entry *re = NULL;
7864 
7865 	if (!view->searching) {
7866 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7867 		return NULL;
7868 	}
7869 
7870 	if (s->matched_entry) {
7871 		if (view->searching == TOG_SEARCH_FORWARD) {
7872 			if (s->selected_entry)
7873 				re = TAILQ_NEXT(s->selected_entry, entry);
7874 			else
7875 				re = TAILQ_PREV(s->selected_entry,
7876 				    tog_reflist_head, entry);
7877 		} else {
7878 			if (s->selected_entry == NULL)
7879 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7880 			else
7881 				re = TAILQ_PREV(s->selected_entry,
7882 				    tog_reflist_head, entry);
7883 		}
7884 	} else {
7885 		if (s->selected_entry)
7886 			re = s->selected_entry;
7887 		else if (view->searching == TOG_SEARCH_FORWARD)
7888 			re = TAILQ_FIRST(&s->refs);
7889 		else
7890 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7891 	}
7892 
7893 	while (1) {
7894 		if (re == NULL) {
7895 			if (s->matched_entry == NULL) {
7896 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7897 				return NULL;
7898 			}
7899 			if (view->searching == TOG_SEARCH_FORWARD)
7900 				re = TAILQ_FIRST(&s->refs);
7901 			else
7902 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7903 		}
7904 
7905 		if (match_reflist_entry(re, &view->regex)) {
7906 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7907 			s->matched_entry = re;
7908 			break;
7909 		}
7910 
7911 		if (view->searching == TOG_SEARCH_FORWARD)
7912 			re = TAILQ_NEXT(re, entry);
7913 		else
7914 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7915 	}
7916 
7917 	if (s->matched_entry) {
7918 		s->first_displayed_entry = s->matched_entry;
7919 		s->selected = 0;
7920 	}
7921 
7922 	return NULL;
7923 }
7924 
7925 static const struct got_error *
7926 show_ref_view(struct tog_view *view)
7927 {
7928 	const struct got_error *err = NULL;
7929 	struct tog_ref_view_state *s = &view->state.ref;
7930 	struct tog_reflist_entry *re;
7931 	char *line = NULL;
7932 	wchar_t *wline;
7933 	struct tog_color *tc;
7934 	int width, n;
7935 	int limit = view->nlines;
7936 
7937 	werase(view->window);
7938 
7939 	s->ndisplayed = 0;
7940 	if (view_is_hsplit_top(view))
7941 		--limit;  /* border */
7942 
7943 	if (limit == 0)
7944 		return NULL;
7945 
7946 	re = s->first_displayed_entry;
7947 
7948 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7949 	    s->nrefs) == -1)
7950 		return got_error_from_errno("asprintf");
7951 
7952 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7953 	if (err) {
7954 		free(line);
7955 		return err;
7956 	}
7957 	if (view_needs_focus_indication(view))
7958 		wstandout(view->window);
7959 	waddwstr(view->window, wline);
7960 	while (width++ < view->ncols)
7961 		waddch(view->window, ' ');
7962 	if (view_needs_focus_indication(view))
7963 		wstandend(view->window);
7964 	free(wline);
7965 	wline = NULL;
7966 	free(line);
7967 	line = NULL;
7968 	if (--limit <= 0)
7969 		return NULL;
7970 
7971 	n = 0;
7972 	while (re && limit > 0) {
7973 		char *line = NULL;
7974 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7975 
7976 		if (s->show_date) {
7977 			struct got_commit_object *ci;
7978 			struct got_tag_object *tag;
7979 			struct got_object_id *id;
7980 			struct tm tm;
7981 			time_t t;
7982 
7983 			err = got_ref_resolve(&id, s->repo, re->ref);
7984 			if (err)
7985 				return err;
7986 			err = got_object_open_as_tag(&tag, s->repo, id);
7987 			if (err) {
7988 				if (err->code != GOT_ERR_OBJ_TYPE) {
7989 					free(id);
7990 					return err;
7991 				}
7992 				err = got_object_open_as_commit(&ci, s->repo,
7993 				    id);
7994 				if (err) {
7995 					free(id);
7996 					return err;
7997 				}
7998 				t = got_object_commit_get_committer_time(ci);
7999 				got_object_commit_close(ci);
8000 			} else {
8001 				t = got_object_tag_get_tagger_time(tag);
8002 				got_object_tag_close(tag);
8003 			}
8004 			free(id);
8005 			if (gmtime_r(&t, &tm) == NULL)
8006 				return got_error_from_errno("gmtime_r");
8007 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8008 				return got_error(GOT_ERR_NO_SPACE);
8009 		}
8010 		if (got_ref_is_symbolic(re->ref)) {
8011 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8012 			    ymd : "", got_ref_get_name(re->ref),
8013 			    got_ref_get_symref_target(re->ref)) == -1)
8014 				return got_error_from_errno("asprintf");
8015 		} else if (s->show_ids) {
8016 			struct got_object_id *id;
8017 			char *id_str;
8018 			err = got_ref_resolve(&id, s->repo, re->ref);
8019 			if (err)
8020 				return err;
8021 			err = got_object_id_str(&id_str, id);
8022 			if (err) {
8023 				free(id);
8024 				return err;
8025 			}
8026 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8027 			    got_ref_get_name(re->ref), id_str) == -1) {
8028 				err = got_error_from_errno("asprintf");
8029 				free(id);
8030 				free(id_str);
8031 				return err;
8032 			}
8033 			free(id);
8034 			free(id_str);
8035 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8036 		    got_ref_get_name(re->ref)) == -1)
8037 			return got_error_from_errno("asprintf");
8038 
8039 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8040 		    0, 0);
8041 		if (err) {
8042 			free(line);
8043 			return err;
8044 		}
8045 		if (n == s->selected) {
8046 			if (view->focussed)
8047 				wstandout(view->window);
8048 			s->selected_entry = re;
8049 		}
8050 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8051 		if (tc)
8052 			wattr_on(view->window,
8053 			    COLOR_PAIR(tc->colorpair), NULL);
8054 		waddwstr(view->window, wline);
8055 		if (tc)
8056 			wattr_off(view->window,
8057 			    COLOR_PAIR(tc->colorpair), NULL);
8058 		if (width < view->ncols - 1)
8059 			waddch(view->window, '\n');
8060 		if (n == s->selected && view->focussed)
8061 			wstandend(view->window);
8062 		free(line);
8063 		free(wline);
8064 		wline = NULL;
8065 		n++;
8066 		s->ndisplayed++;
8067 		s->last_displayed_entry = re;
8068 
8069 		limit--;
8070 		re = TAILQ_NEXT(re, entry);
8071 	}
8072 
8073 	view_border(view);
8074 	return err;
8075 }
8076 
8077 static const struct got_error *
8078 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8079     struct tog_reflist_entry *re, struct got_repository *repo)
8080 {
8081 	const struct got_error *err = NULL;
8082 	struct got_object_id *commit_id = NULL;
8083 	struct tog_view *tree_view;
8084 
8085 	*new_view = NULL;
8086 
8087 	err = resolve_reflist_entry(&commit_id, re, repo);
8088 	if (err) {
8089 		if (err->code != GOT_ERR_OBJ_TYPE)
8090 			return err;
8091 		else
8092 			return NULL;
8093 	}
8094 
8095 
8096 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8097 	if (tree_view == NULL) {
8098 		err = got_error_from_errno("view_open");
8099 		goto done;
8100 	}
8101 
8102 	err = open_tree_view(tree_view, commit_id,
8103 	    got_ref_get_name(re->ref), repo);
8104 	if (err)
8105 		goto done;
8106 
8107 	*new_view = tree_view;
8108 done:
8109 	free(commit_id);
8110 	return err;
8111 }
8112 
8113 static const struct got_error *
8114 ref_goto_line(struct tog_view *view, int nlines)
8115 {
8116 	const struct got_error		*err = NULL;
8117 	struct tog_ref_view_state	*s = &view->state.ref;
8118 	int				 g, idx = s->selected_entry->idx;
8119 
8120 	g = view->gline;
8121 	view->gline = 0;
8122 
8123 	if (g == 0)
8124 		g = 1;
8125 	else if (g > s->nrefs)
8126 		g = s->nrefs;
8127 
8128 	if (g >= s->first_displayed_entry->idx + 1 &&
8129 	    g <= s->last_displayed_entry->idx + 1 &&
8130 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8131 		s->selected = g - s->first_displayed_entry->idx - 1;
8132 		return NULL;
8133 	}
8134 
8135 	if (idx + 1 < g) {
8136 		err = ref_scroll_down(view, g - idx - 1);
8137 		if (err)
8138 			return err;
8139 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8140 		    s->first_displayed_entry->idx + s->selected < g &&
8141 		    s->selected < s->ndisplayed - 1)
8142 			s->selected = g - s->first_displayed_entry->idx - 1;
8143 	} else if (idx + 1 > g)
8144 		ref_scroll_up(s, idx - g + 1);
8145 
8146 	if (g < nlines && s->first_displayed_entry->idx == 0)
8147 		s->selected = g - 1;
8148 
8149 	return NULL;
8150 
8151 }
8152 
8153 static const struct got_error *
8154 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8155 {
8156 	const struct got_error *err = NULL;
8157 	struct tog_ref_view_state *s = &view->state.ref;
8158 	struct tog_reflist_entry *re;
8159 	int n, nscroll = view->nlines - 1;
8160 
8161 	if (view->gline)
8162 		return ref_goto_line(view, nscroll);
8163 
8164 	switch (ch) {
8165 	case 'i':
8166 		s->show_ids = !s->show_ids;
8167 		view->count = 0;
8168 		break;
8169 	case 'm':
8170 		s->show_date = !s->show_date;
8171 		view->count = 0;
8172 		break;
8173 	case 'o':
8174 		s->sort_by_date = !s->sort_by_date;
8175 		view->count = 0;
8176 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8177 		    got_ref_cmp_by_commit_timestamp_descending :
8178 		    tog_ref_cmp_by_name, s->repo);
8179 		if (err)
8180 			break;
8181 		got_reflist_object_id_map_free(tog_refs_idmap);
8182 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8183 		    &tog_refs, s->repo);
8184 		if (err)
8185 			break;
8186 		ref_view_free_refs(s);
8187 		err = ref_view_load_refs(s);
8188 		break;
8189 	case KEY_ENTER:
8190 	case '\r':
8191 		view->count = 0;
8192 		if (!s->selected_entry)
8193 			break;
8194 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8195 		break;
8196 	case 'T':
8197 		view->count = 0;
8198 		if (!s->selected_entry)
8199 			break;
8200 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8201 		break;
8202 	case 'g':
8203 	case KEY_HOME:
8204 		s->selected = 0;
8205 		view->count = 0;
8206 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8207 		break;
8208 	case 'G':
8209 	case KEY_END: {
8210 		int eos = view->nlines - 1;
8211 
8212 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8213 			--eos;  /* border */
8214 		s->selected = 0;
8215 		view->count = 0;
8216 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8217 		for (n = 0; n < eos; n++) {
8218 			if (re == NULL)
8219 				break;
8220 			s->first_displayed_entry = re;
8221 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8222 		}
8223 		if (n > 0)
8224 			s->selected = n - 1;
8225 		break;
8226 	}
8227 	case 'k':
8228 	case KEY_UP:
8229 	case CTRL('p'):
8230 		if (s->selected > 0) {
8231 			s->selected--;
8232 			break;
8233 		}
8234 		ref_scroll_up(s, 1);
8235 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8236 			view->count = 0;
8237 		break;
8238 	case CTRL('u'):
8239 	case 'u':
8240 		nscroll /= 2;
8241 		/* FALL THROUGH */
8242 	case KEY_PPAGE:
8243 	case CTRL('b'):
8244 	case 'b':
8245 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8246 			s->selected -= MIN(nscroll, s->selected);
8247 		ref_scroll_up(s, MAX(0, nscroll));
8248 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8249 			view->count = 0;
8250 		break;
8251 	case 'j':
8252 	case KEY_DOWN:
8253 	case CTRL('n'):
8254 		if (s->selected < s->ndisplayed - 1) {
8255 			s->selected++;
8256 			break;
8257 		}
8258 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8259 			/* can't scroll any further */
8260 			view->count = 0;
8261 			break;
8262 		}
8263 		ref_scroll_down(view, 1);
8264 		break;
8265 	case CTRL('d'):
8266 	case 'd':
8267 		nscroll /= 2;
8268 		/* FALL THROUGH */
8269 	case KEY_NPAGE:
8270 	case CTRL('f'):
8271 	case 'f':
8272 	case ' ':
8273 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8274 			/* can't scroll any further; move cursor down */
8275 			if (s->selected < s->ndisplayed - 1)
8276 				s->selected += MIN(nscroll,
8277 				    s->ndisplayed - s->selected - 1);
8278 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8279 				s->selected += s->ndisplayed - s->selected - 1;
8280 			view->count = 0;
8281 			break;
8282 		}
8283 		ref_scroll_down(view, nscroll);
8284 		break;
8285 	case CTRL('l'):
8286 		view->count = 0;
8287 		tog_free_refs();
8288 		err = tog_load_refs(s->repo, s->sort_by_date);
8289 		if (err)
8290 			break;
8291 		ref_view_free_refs(s);
8292 		err = ref_view_load_refs(s);
8293 		break;
8294 	case KEY_RESIZE:
8295 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8296 			s->selected = view->nlines - 2;
8297 		break;
8298 	default:
8299 		view->count = 0;
8300 		break;
8301 	}
8302 
8303 	return err;
8304 }
8305 
8306 __dead static void
8307 usage_ref(void)
8308 {
8309 	endwin();
8310 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8311 	    getprogname());
8312 	exit(1);
8313 }
8314 
8315 static const struct got_error *
8316 cmd_ref(int argc, char *argv[])
8317 {
8318 	const struct got_error *error;
8319 	struct got_repository *repo = NULL;
8320 	struct got_worktree *worktree = NULL;
8321 	char *cwd = NULL, *repo_path = NULL;
8322 	int ch;
8323 	struct tog_view *view;
8324 	int *pack_fds = NULL;
8325 
8326 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8327 		switch (ch) {
8328 		case 'r':
8329 			repo_path = realpath(optarg, NULL);
8330 			if (repo_path == NULL)
8331 				return got_error_from_errno2("realpath",
8332 				    optarg);
8333 			break;
8334 		default:
8335 			usage_ref();
8336 			/* NOTREACHED */
8337 		}
8338 	}
8339 
8340 	argc -= optind;
8341 	argv += optind;
8342 
8343 	if (argc > 1)
8344 		usage_ref();
8345 
8346 	error = got_repo_pack_fds_open(&pack_fds);
8347 	if (error != NULL)
8348 		goto done;
8349 
8350 	if (repo_path == NULL) {
8351 		cwd = getcwd(NULL, 0);
8352 		if (cwd == NULL)
8353 			return got_error_from_errno("getcwd");
8354 		error = got_worktree_open(&worktree, cwd);
8355 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8356 			goto done;
8357 		if (worktree)
8358 			repo_path =
8359 			    strdup(got_worktree_get_repo_path(worktree));
8360 		else
8361 			repo_path = strdup(cwd);
8362 		if (repo_path == NULL) {
8363 			error = got_error_from_errno("strdup");
8364 			goto done;
8365 		}
8366 	}
8367 
8368 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8369 	if (error != NULL)
8370 		goto done;
8371 
8372 	init_curses();
8373 
8374 	error = apply_unveil(got_repo_get_path(repo), NULL);
8375 	if (error)
8376 		goto done;
8377 
8378 	error = tog_load_refs(repo, 0);
8379 	if (error)
8380 		goto done;
8381 
8382 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8383 	if (view == NULL) {
8384 		error = got_error_from_errno("view_open");
8385 		goto done;
8386 	}
8387 
8388 	error = open_ref_view(view, repo);
8389 	if (error)
8390 		goto done;
8391 
8392 	if (worktree) {
8393 		/* Release work tree lock. */
8394 		got_worktree_close(worktree);
8395 		worktree = NULL;
8396 	}
8397 	error = view_loop(view);
8398 done:
8399 	free(repo_path);
8400 	free(cwd);
8401 	if (repo) {
8402 		const struct got_error *close_err = got_repo_close(repo);
8403 		if (close_err)
8404 			error = close_err;
8405 	}
8406 	if (pack_fds) {
8407 		const struct got_error *pack_err =
8408 		    got_repo_pack_fds_close(pack_fds);
8409 		if (error == NULL)
8410 			error = pack_err;
8411 	}
8412 	tog_free_refs();
8413 	return error;
8414 }
8415 
8416 static const struct got_error*
8417 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8418     const char *str)
8419 {
8420 	size_t len;
8421 
8422 	if (win == NULL)
8423 		win = stdscr;
8424 
8425 	len = strlen(str);
8426 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8427 
8428 	if (focus)
8429 		wstandout(win);
8430 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8431 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8432 	if (focus)
8433 		wstandend(win);
8434 
8435 	return NULL;
8436 }
8437 
8438 static const struct got_error *
8439 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8440 {
8441 	off_t *p;
8442 
8443 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8444 	if (p == NULL) {
8445 		free(*line_offsets);
8446 		*line_offsets = NULL;
8447 		return got_error_from_errno("reallocarray");
8448 	}
8449 
8450 	*line_offsets = p;
8451 	(*line_offsets)[*nlines] = off;
8452 	++(*nlines);
8453 	return NULL;
8454 }
8455 
8456 static const struct got_error *
8457 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8458 {
8459 	*ret = 0;
8460 
8461 	for (;n > 0; --n, ++km) {
8462 		char	*t0, *t, *k;
8463 		size_t	 len = 1;
8464 
8465 		if (km->keys == NULL)
8466 			continue;
8467 
8468 		t = t0 = strdup(km->keys);
8469 		if (t0 == NULL)
8470 			return got_error_from_errno("strdup");
8471 
8472 		len += strlen(t);
8473 		while ((k = strsep(&t, " ")) != NULL)
8474 			len += strlen(k) > 1 ? 2 : 0;
8475 		free(t0);
8476 		*ret = MAX(*ret, len);
8477 	}
8478 
8479 	return NULL;
8480 }
8481 
8482 /*
8483  * Write keymap section headers, keys, and key info in km to f.
8484  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8485  * wrap control and symbolic keys in guillemets, else use <>.
8486  */
8487 static const struct got_error *
8488 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8489 {
8490 	int n, len = width;
8491 
8492 	if (km->keys) {
8493 		static const char *u8_glyph[] = {
8494 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8495 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8496 		};
8497 		char	*t0, *t, *k;
8498 		int	 cs, s, first = 1;
8499 
8500 		cs = got_locale_is_utf8();
8501 
8502 		t = t0 = strdup(km->keys);
8503 		if (t0 == NULL)
8504 			return got_error_from_errno("strdup");
8505 
8506 		len = strlen(km->keys);
8507 		while ((k = strsep(&t, " ")) != NULL) {
8508 			s = strlen(k) > 1;  /* control or symbolic key */
8509 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8510 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8511 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8512 			if (n < 0) {
8513 				free(t0);
8514 				return got_error_from_errno("fprintf");
8515 			}
8516 			first = 0;
8517 			len += s ? 2 : 0;
8518 			*off += n;
8519 		}
8520 		free(t0);
8521 	}
8522 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8523 	if (n < 0)
8524 		return got_error_from_errno("fprintf");
8525 	*off += n;
8526 
8527 	return NULL;
8528 }
8529 
8530 static const struct got_error *
8531 format_help(struct tog_help_view_state *s)
8532 {
8533 	const struct got_error		*err = NULL;
8534 	off_t				 off = 0;
8535 	int				 i, max, n, show = s->all;
8536 	static const struct tog_key_map	 km[] = {
8537 #define KEYMAP_(info, type)	{ NULL, (info), type }
8538 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8539 		GENERATE_HELP
8540 #undef KEYMAP_
8541 #undef KEY_
8542 	};
8543 
8544 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8545 	if (err)
8546 		return err;
8547 
8548 	n = nitems(km);
8549 	err = max_key_str(&max, km, n);
8550 	if (err)
8551 		return err;
8552 
8553 	for (i = 0; i < n; ++i) {
8554 		if (km[i].keys == NULL) {
8555 			show = s->all;
8556 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8557 			    km[i].type == s->type || s->all)
8558 				show = 1;
8559 		}
8560 		if (show) {
8561 			err = format_help_line(&off, s->f, &km[i], max);
8562 			if (err)
8563 				return err;
8564 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8565 			if (err)
8566 				return err;
8567 		}
8568 	}
8569 	fputc('\n', s->f);
8570 	++off;
8571 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8572 	return err;
8573 }
8574 
8575 static const struct got_error *
8576 create_help(struct tog_help_view_state *s)
8577 {
8578 	FILE			*f;
8579 	const struct got_error	*err;
8580 
8581 	free(s->line_offsets);
8582 	s->line_offsets = NULL;
8583 	s->nlines = 0;
8584 
8585 	f = got_opentemp();
8586 	if (f == NULL)
8587 		return got_error_from_errno("got_opentemp");
8588 	s->f = f;
8589 
8590 	err = format_help(s);
8591 	if (err)
8592 		return err;
8593 
8594 	if (s->f && fflush(s->f) != 0)
8595 		return got_error_from_errno("fflush");
8596 
8597 	return NULL;
8598 }
8599 
8600 static const struct got_error *
8601 search_start_help_view(struct tog_view *view)
8602 {
8603 	view->state.help.matched_line = 0;
8604 	return NULL;
8605 }
8606 
8607 static void
8608 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8609     size_t *nlines, int **first, int **last, int **match, int **selected)
8610 {
8611 	struct tog_help_view_state *s = &view->state.help;
8612 
8613 	*f = s->f;
8614 	*nlines = s->nlines;
8615 	*line_offsets = s->line_offsets;
8616 	*match = &s->matched_line;
8617 	*first = &s->first_displayed_line;
8618 	*last = &s->last_displayed_line;
8619 	*selected = &s->selected_line;
8620 }
8621 
8622 static const struct got_error *
8623 show_help_view(struct tog_view *view)
8624 {
8625 	struct tog_help_view_state	*s = &view->state.help;
8626 	const struct got_error		*err;
8627 	regmatch_t			*regmatch = &view->regmatch;
8628 	wchar_t				*wline;
8629 	char				*line;
8630 	ssize_t				 linelen;
8631 	size_t				 linesz = 0;
8632 	int				 width, nprinted = 0, rc = 0;
8633 	int				 eos = view->nlines;
8634 
8635 	if (view_is_hsplit_top(view))
8636 		--eos;  /* account for border */
8637 
8638 	s->lineno = 0;
8639 	rewind(s->f);
8640 	werase(view->window);
8641 
8642 	if (view->gline > s->nlines - 1)
8643 		view->gline = s->nlines - 1;
8644 
8645 	err = win_draw_center(view->window, 0, 0, view->ncols,
8646 	    view_needs_focus_indication(view),
8647 	    "tog help (press q to return to tog)");
8648 	if (err)
8649 		return err;
8650 	if (eos <= 1)
8651 		return NULL;
8652 	waddstr(view->window, "\n\n");
8653 	eos -= 2;
8654 
8655 	s->eof = 0;
8656 	view->maxx = 0;
8657 	line = NULL;
8658 	while (eos > 0 && nprinted < eos) {
8659 		attr_t attr = 0;
8660 
8661 		linelen = getline(&line, &linesz, s->f);
8662 		if (linelen == -1) {
8663 			if (!feof(s->f)) {
8664 				free(line);
8665 				return got_ferror(s->f, GOT_ERR_IO);
8666 			}
8667 			s->eof = 1;
8668 			break;
8669 		}
8670 		if (++s->lineno < s->first_displayed_line)
8671 			continue;
8672 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8673 			continue;
8674 		if (s->lineno == view->hiline)
8675 			attr = A_STANDOUT;
8676 
8677 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8678 		    view->x ? 1 : 0);
8679 		if (err) {
8680 			free(line);
8681 			return err;
8682 		}
8683 		view->maxx = MAX(view->maxx, width);
8684 		free(wline);
8685 		wline = NULL;
8686 
8687 		if (attr)
8688 			wattron(view->window, attr);
8689 		if (s->first_displayed_line + nprinted == s->matched_line &&
8690 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8691 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8692 			    view->window, view->x, regmatch);
8693 			if (err) {
8694 				free(line);
8695 				return err;
8696 			}
8697 		} else {
8698 			int skip;
8699 
8700 			err = format_line(&wline, &width, &skip, line,
8701 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8702 			if (err) {
8703 				free(line);
8704 				return err;
8705 			}
8706 			rc = waddwstr(view->window, &wline[skip]);
8707 			free(wline);
8708 			wline = NULL;
8709 			if (rc == ERR)
8710 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8711 		}
8712 		if (s->lineno == view->hiline) {
8713 			while (width++ < view->ncols)
8714 				waddch(view->window, ' ');
8715 		} else {
8716 			if (width <= view->ncols)
8717 				waddch(view->window, '\n');
8718 		}
8719 		if (attr)
8720 			wattroff(view->window, attr);
8721 		if (++nprinted == 1)
8722 			s->first_displayed_line = s->lineno;
8723 	}
8724 	free(line);
8725 	if (nprinted > 0)
8726 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8727 	else
8728 		s->last_displayed_line = s->first_displayed_line;
8729 
8730 	view_border(view);
8731 
8732 	if (s->eof) {
8733 		rc = waddnstr(view->window,
8734 		    "See the tog(1) manual page for full documentation",
8735 		    view->ncols - 1);
8736 		if (rc == ERR)
8737 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8738 	} else {
8739 		wmove(view->window, view->nlines - 1, 0);
8740 		wclrtoeol(view->window);
8741 		wstandout(view->window);
8742 		rc = waddnstr(view->window, "scroll down for more...",
8743 		    view->ncols - 1);
8744 		if (rc == ERR)
8745 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8746 		if (getcurx(view->window) < view->ncols - 6) {
8747 			rc = wprintw(view->window, "[%.0f%%]",
8748 			    100.00 * s->last_displayed_line / s->nlines);
8749 			if (rc == ERR)
8750 				return got_error_msg(GOT_ERR_IO, "wprintw");
8751 		}
8752 		wstandend(view->window);
8753 	}
8754 
8755 	return NULL;
8756 }
8757 
8758 static const struct got_error *
8759 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8760 {
8761 	struct tog_help_view_state	*s = &view->state.help;
8762 	const struct got_error		*err = NULL;
8763 	char				*line = NULL;
8764 	ssize_t				 linelen;
8765 	size_t				 linesz = 0;
8766 	int				 eos, nscroll;
8767 
8768 	eos = nscroll = view->nlines;
8769 	if (view_is_hsplit_top(view))
8770 		--eos;  /* border */
8771 
8772 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8773 
8774 	switch (ch) {
8775 	case '0':
8776 		view->x = 0;
8777 		break;
8778 	case '$':
8779 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8780 		view->count = 0;
8781 		break;
8782 	case KEY_RIGHT:
8783 	case 'l':
8784 		if (view->x + view->ncols / 3 < view->maxx)
8785 			view->x += 2;
8786 		else
8787 			view->count = 0;
8788 		break;
8789 	case KEY_LEFT:
8790 	case 'h':
8791 		view->x -= MIN(view->x, 2);
8792 		if (view->x <= 0)
8793 			view->count = 0;
8794 		break;
8795 	case 'g':
8796 	case KEY_HOME:
8797 		s->first_displayed_line = 1;
8798 		view->count = 0;
8799 		break;
8800 	case 'G':
8801 	case KEY_END:
8802 		view->count = 0;
8803 		if (s->eof)
8804 			break;
8805 		s->first_displayed_line = (s->nlines - eos) + 3;
8806 		s->eof = 1;
8807 		break;
8808 	case 'k':
8809 	case KEY_UP:
8810 		if (s->first_displayed_line > 1)
8811 			--s->first_displayed_line;
8812 		else
8813 			view->count = 0;
8814 		break;
8815 	case CTRL('u'):
8816 	case 'u':
8817 		nscroll /= 2;
8818 		/* FALL THROUGH */
8819 	case KEY_PPAGE:
8820 	case CTRL('b'):
8821 	case 'b':
8822 		if (s->first_displayed_line == 1) {
8823 			view->count = 0;
8824 			break;
8825 		}
8826 		while (--nscroll > 0 && s->first_displayed_line > 1)
8827 			s->first_displayed_line--;
8828 		break;
8829 	case 'j':
8830 	case KEY_DOWN:
8831 	case CTRL('n'):
8832 		if (!s->eof)
8833 			++s->first_displayed_line;
8834 		else
8835 			view->count = 0;
8836 		break;
8837 	case CTRL('d'):
8838 	case 'd':
8839 		nscroll /= 2;
8840 		/* FALL THROUGH */
8841 	case KEY_NPAGE:
8842 	case CTRL('f'):
8843 	case 'f':
8844 	case ' ':
8845 		if (s->eof) {
8846 			view->count = 0;
8847 			break;
8848 		}
8849 		while (!s->eof && --nscroll > 0) {
8850 			linelen = getline(&line, &linesz, s->f);
8851 			s->first_displayed_line++;
8852 			if (linelen == -1) {
8853 				if (feof(s->f))
8854 					s->eof = 1;
8855 				else
8856 					err = got_ferror(s->f, GOT_ERR_IO);
8857 				break;
8858 			}
8859 		}
8860 		free(line);
8861 		break;
8862 	default:
8863 		view->count = 0;
8864 		break;
8865 	}
8866 
8867 	return err;
8868 }
8869 
8870 static const struct got_error *
8871 close_help_view(struct tog_view *view)
8872 {
8873 	struct tog_help_view_state *s = &view->state.help;
8874 
8875 	free(s->line_offsets);
8876 	s->line_offsets = NULL;
8877 	if (fclose(s->f) == EOF)
8878 		return got_error_from_errno("fclose");
8879 
8880 	return NULL;
8881 }
8882 
8883 static const struct got_error *
8884 reset_help_view(struct tog_view *view)
8885 {
8886 	struct tog_help_view_state *s = &view->state.help;
8887 
8888 
8889 	if (s->f && fclose(s->f) == EOF)
8890 		return got_error_from_errno("fclose");
8891 
8892 	wclear(view->window);
8893 	view->count = 0;
8894 	view->x = 0;
8895 	s->all = !s->all;
8896 	s->first_displayed_line = 1;
8897 	s->last_displayed_line = view->nlines;
8898 	s->matched_line = 0;
8899 
8900 	return create_help(s);
8901 }
8902 
8903 static const struct got_error *
8904 open_help_view(struct tog_view *view, struct tog_view *parent)
8905 {
8906 	const struct got_error		*err = NULL;
8907 	struct tog_help_view_state	*s = &view->state.help;
8908 
8909 	s->type = (enum tog_keymap_type)parent->type;
8910 	s->first_displayed_line = 1;
8911 	s->last_displayed_line = view->nlines;
8912 	s->selected_line = 1;
8913 
8914 	view->show = show_help_view;
8915 	view->input = input_help_view;
8916 	view->reset = reset_help_view;
8917 	view->close = close_help_view;
8918 	view->search_start = search_start_help_view;
8919 	view->search_setup = search_setup_help_view;
8920 	view->search_next = search_next_view_match;
8921 
8922 	err = create_help(s);
8923 	return err;
8924 }
8925 
8926 static const struct got_error *
8927 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8928     enum tog_view_type request, int y, int x)
8929 {
8930 	const struct got_error *err = NULL;
8931 
8932 	*new_view = NULL;
8933 
8934 	switch (request) {
8935 	case TOG_VIEW_DIFF:
8936 		if (view->type == TOG_VIEW_LOG) {
8937 			struct tog_log_view_state *s = &view->state.log;
8938 
8939 			err = open_diff_view_for_commit(new_view, y, x,
8940 			    s->selected_entry->commit, s->selected_entry->id,
8941 			    view, s->repo);
8942 		} else
8943 			return got_error_msg(GOT_ERR_NOT_IMPL,
8944 			    "parent/child view pair not supported");
8945 		break;
8946 	case TOG_VIEW_BLAME:
8947 		if (view->type == TOG_VIEW_TREE) {
8948 			struct tog_tree_view_state *s = &view->state.tree;
8949 
8950 			err = blame_tree_entry(new_view, y, x,
8951 			    s->selected_entry, &s->parents, s->commit_id,
8952 			    s->repo);
8953 		} else
8954 			return got_error_msg(GOT_ERR_NOT_IMPL,
8955 			    "parent/child view pair not supported");
8956 		break;
8957 	case TOG_VIEW_LOG:
8958 		if (view->type == TOG_VIEW_BLAME)
8959 			err = log_annotated_line(new_view, y, x,
8960 			    view->state.blame.repo, view->state.blame.id_to_log);
8961 		else if (view->type == TOG_VIEW_TREE)
8962 			err = log_selected_tree_entry(new_view, y, x,
8963 			    &view->state.tree);
8964 		else if (view->type == TOG_VIEW_REF)
8965 			err = log_ref_entry(new_view, y, x,
8966 			    view->state.ref.selected_entry,
8967 			    view->state.ref.repo);
8968 		else
8969 			return got_error_msg(GOT_ERR_NOT_IMPL,
8970 			    "parent/child view pair not supported");
8971 		break;
8972 	case TOG_VIEW_TREE:
8973 		if (view->type == TOG_VIEW_LOG)
8974 			err = browse_commit_tree(new_view, y, x,
8975 			    view->state.log.selected_entry,
8976 			    view->state.log.in_repo_path,
8977 			    view->state.log.head_ref_name,
8978 			    view->state.log.repo);
8979 		else if (view->type == TOG_VIEW_REF)
8980 			err = browse_ref_tree(new_view, y, x,
8981 			    view->state.ref.selected_entry,
8982 			    view->state.ref.repo);
8983 		else
8984 			return got_error_msg(GOT_ERR_NOT_IMPL,
8985 			    "parent/child view pair not supported");
8986 		break;
8987 	case TOG_VIEW_REF:
8988 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8989 		if (*new_view == NULL)
8990 			return got_error_from_errno("view_open");
8991 		if (view->type == TOG_VIEW_LOG)
8992 			err = open_ref_view(*new_view, view->state.log.repo);
8993 		else if (view->type == TOG_VIEW_TREE)
8994 			err = open_ref_view(*new_view, view->state.tree.repo);
8995 		else
8996 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8997 			    "parent/child view pair not supported");
8998 		if (err)
8999 			view_close(*new_view);
9000 		break;
9001 	case TOG_VIEW_HELP:
9002 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9003 		if (*new_view == NULL)
9004 			return got_error_from_errno("view_open");
9005 		err = open_help_view(*new_view, view);
9006 		if (err)
9007 			view_close(*new_view);
9008 		break;
9009 	default:
9010 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9011 	}
9012 
9013 	return err;
9014 }
9015 
9016 /*
9017  * If view was scrolled down to move the selected line into view when opening a
9018  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9019  */
9020 static void
9021 offset_selection_up(struct tog_view *view)
9022 {
9023 	switch (view->type) {
9024 	case TOG_VIEW_BLAME: {
9025 		struct tog_blame_view_state *s = &view->state.blame;
9026 		if (s->first_displayed_line == 1) {
9027 			s->selected_line = MAX(s->selected_line - view->offset,
9028 			    1);
9029 			break;
9030 		}
9031 		if (s->first_displayed_line > view->offset)
9032 			s->first_displayed_line -= view->offset;
9033 		else
9034 			s->first_displayed_line = 1;
9035 		s->selected_line += view->offset;
9036 		break;
9037 	}
9038 	case TOG_VIEW_LOG:
9039 		log_scroll_up(&view->state.log, view->offset);
9040 		view->state.log.selected += view->offset;
9041 		break;
9042 	case TOG_VIEW_REF:
9043 		ref_scroll_up(&view->state.ref, view->offset);
9044 		view->state.ref.selected += view->offset;
9045 		break;
9046 	case TOG_VIEW_TREE:
9047 		tree_scroll_up(&view->state.tree, view->offset);
9048 		view->state.tree.selected += view->offset;
9049 		break;
9050 	default:
9051 		break;
9052 	}
9053 
9054 	view->offset = 0;
9055 }
9056 
9057 /*
9058  * If the selected line is in the section of screen covered by the bottom split,
9059  * scroll down offset lines to move it into view and index its new position.
9060  */
9061 static const struct got_error *
9062 offset_selection_down(struct tog_view *view)
9063 {
9064 	const struct got_error	*err = NULL;
9065 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9066 	int			*selected = NULL;
9067 	int			 header, offset;
9068 
9069 	switch (view->type) {
9070 	case TOG_VIEW_BLAME: {
9071 		struct tog_blame_view_state *s = &view->state.blame;
9072 		header = 3;
9073 		scrolld = NULL;
9074 		if (s->selected_line > view->nlines - header) {
9075 			offset = abs(view->nlines - s->selected_line - header);
9076 			s->first_displayed_line += offset;
9077 			s->selected_line -= offset;
9078 			view->offset = offset;
9079 		}
9080 		break;
9081 	}
9082 	case TOG_VIEW_LOG: {
9083 		struct tog_log_view_state *s = &view->state.log;
9084 		scrolld = &log_scroll_down;
9085 		header = view_is_parent_view(view) ? 3 : 2;
9086 		selected = &s->selected;
9087 		break;
9088 	}
9089 	case TOG_VIEW_REF: {
9090 		struct tog_ref_view_state *s = &view->state.ref;
9091 		scrolld = &ref_scroll_down;
9092 		header = 3;
9093 		selected = &s->selected;
9094 		break;
9095 	}
9096 	case TOG_VIEW_TREE: {
9097 		struct tog_tree_view_state *s = &view->state.tree;
9098 		scrolld = &tree_scroll_down;
9099 		header = 5;
9100 		selected = &s->selected;
9101 		break;
9102 	}
9103 	default:
9104 		selected = NULL;
9105 		scrolld = NULL;
9106 		header = 0;
9107 		break;
9108 	}
9109 
9110 	if (selected && *selected > view->nlines - header) {
9111 		offset = abs(view->nlines - *selected - header);
9112 		view->offset = offset;
9113 		if (scrolld && offset) {
9114 			err = scrolld(view, offset);
9115 			*selected -= offset;
9116 		}
9117 	}
9118 
9119 	return err;
9120 }
9121 
9122 static void
9123 list_commands(FILE *fp)
9124 {
9125 	size_t i;
9126 
9127 	fprintf(fp, "commands:");
9128 	for (i = 0; i < nitems(tog_commands); i++) {
9129 		const struct tog_cmd *cmd = &tog_commands[i];
9130 		fprintf(fp, " %s", cmd->name);
9131 	}
9132 	fputc('\n', fp);
9133 }
9134 
9135 __dead static void
9136 usage(int hflag, int status)
9137 {
9138 	FILE *fp = (status == 0) ? stdout : stderr;
9139 
9140 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9141 	    getprogname());
9142 	if (hflag) {
9143 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9144 		list_commands(fp);
9145 	}
9146 	exit(status);
9147 }
9148 
9149 static char **
9150 make_argv(int argc, ...)
9151 {
9152 	va_list ap;
9153 	char **argv;
9154 	int i;
9155 
9156 	va_start(ap, argc);
9157 
9158 	argv = calloc(argc, sizeof(char *));
9159 	if (argv == NULL)
9160 		err(1, "calloc");
9161 	for (i = 0; i < argc; i++) {
9162 		argv[i] = strdup(va_arg(ap, char *));
9163 		if (argv[i] == NULL)
9164 			err(1, "strdup");
9165 	}
9166 
9167 	va_end(ap);
9168 	return argv;
9169 }
9170 
9171 /*
9172  * Try to convert 'tog path' into a 'tog log path' command.
9173  * The user could simply have mistyped the command rather than knowingly
9174  * provided a path. So check whether argv[0] can in fact be resolved
9175  * to a path in the HEAD commit and print a special error if not.
9176  * This hack is for mpi@ <3
9177  */
9178 static const struct got_error *
9179 tog_log_with_path(int argc, char *argv[])
9180 {
9181 	const struct got_error *error = NULL, *close_err;
9182 	const struct tog_cmd *cmd = NULL;
9183 	struct got_repository *repo = NULL;
9184 	struct got_worktree *worktree = NULL;
9185 	struct got_object_id *commit_id = NULL, *id = NULL;
9186 	struct got_commit_object *commit = NULL;
9187 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9188 	char *commit_id_str = NULL, **cmd_argv = NULL;
9189 	int *pack_fds = NULL;
9190 
9191 	cwd = getcwd(NULL, 0);
9192 	if (cwd == NULL)
9193 		return got_error_from_errno("getcwd");
9194 
9195 	error = got_repo_pack_fds_open(&pack_fds);
9196 	if (error != NULL)
9197 		goto done;
9198 
9199 	error = got_worktree_open(&worktree, cwd);
9200 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9201 		goto done;
9202 
9203 	if (worktree)
9204 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9205 	else
9206 		repo_path = strdup(cwd);
9207 	if (repo_path == NULL) {
9208 		error = got_error_from_errno("strdup");
9209 		goto done;
9210 	}
9211 
9212 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9213 	if (error != NULL)
9214 		goto done;
9215 
9216 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9217 	    repo, worktree);
9218 	if (error)
9219 		goto done;
9220 
9221 	error = tog_load_refs(repo, 0);
9222 	if (error)
9223 		goto done;
9224 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9225 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9226 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9227 	if (error)
9228 		goto done;
9229 
9230 	if (worktree) {
9231 		got_worktree_close(worktree);
9232 		worktree = NULL;
9233 	}
9234 
9235 	error = got_object_open_as_commit(&commit, repo, commit_id);
9236 	if (error)
9237 		goto done;
9238 
9239 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9240 	if (error) {
9241 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9242 			goto done;
9243 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9244 		    getprogname(), argv[0]);
9245 		usage(1, 1);
9246 		/* not reached */
9247 	}
9248 
9249 	error = got_object_id_str(&commit_id_str, commit_id);
9250 	if (error)
9251 		goto done;
9252 
9253 	cmd = &tog_commands[0]; /* log */
9254 	argc = 4;
9255 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9256 	error = cmd->cmd_main(argc, cmd_argv);
9257 done:
9258 	if (repo) {
9259 		close_err = got_repo_close(repo);
9260 		if (error == NULL)
9261 			error = close_err;
9262 	}
9263 	if (commit)
9264 		got_object_commit_close(commit);
9265 	if (worktree)
9266 		got_worktree_close(worktree);
9267 	if (pack_fds) {
9268 		const struct got_error *pack_err =
9269 		    got_repo_pack_fds_close(pack_fds);
9270 		if (error == NULL)
9271 			error = pack_err;
9272 	}
9273 	free(id);
9274 	free(commit_id_str);
9275 	free(commit_id);
9276 	free(cwd);
9277 	free(repo_path);
9278 	free(in_repo_path);
9279 	if (cmd_argv) {
9280 		int i;
9281 		for (i = 0; i < argc; i++)
9282 			free(cmd_argv[i]);
9283 		free(cmd_argv);
9284 	}
9285 	tog_free_refs();
9286 	return error;
9287 }
9288 
9289 int
9290 main(int argc, char *argv[])
9291 {
9292 	const struct got_error *error = NULL;
9293 	const struct tog_cmd *cmd = NULL;
9294 	int ch, hflag = 0, Vflag = 0;
9295 	char **cmd_argv = NULL;
9296 	static const struct option longopts[] = {
9297 	    { "version", no_argument, NULL, 'V' },
9298 	    { NULL, 0, NULL, 0}
9299 	};
9300 	char *diff_algo_str = NULL;
9301 
9302 	if (!isatty(STDIN_FILENO))
9303 		errx(1, "standard input is not a tty");
9304 
9305 	setlocale(LC_CTYPE, "");
9306 
9307 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9308 		switch (ch) {
9309 		case 'h':
9310 			hflag = 1;
9311 			break;
9312 		case 'V':
9313 			Vflag = 1;
9314 			break;
9315 		default:
9316 			usage(hflag, 1);
9317 			/* NOTREACHED */
9318 		}
9319 	}
9320 
9321 	argc -= optind;
9322 	argv += optind;
9323 	optind = 1;
9324 	optreset = 1;
9325 
9326 	if (Vflag) {
9327 		got_version_print_str();
9328 		return 0;
9329 	}
9330 
9331 #ifndef PROFILE
9332 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9333 	    NULL) == -1)
9334 		err(1, "pledge");
9335 #endif
9336 
9337 	if (argc == 0) {
9338 		if (hflag)
9339 			usage(hflag, 0);
9340 		/* Build an argument vector which runs a default command. */
9341 		cmd = &tog_commands[0];
9342 		argc = 1;
9343 		cmd_argv = make_argv(argc, cmd->name);
9344 	} else {
9345 		size_t i;
9346 
9347 		/* Did the user specify a command? */
9348 		for (i = 0; i < nitems(tog_commands); i++) {
9349 			if (strncmp(tog_commands[i].name, argv[0],
9350 			    strlen(argv[0])) == 0) {
9351 				cmd = &tog_commands[i];
9352 				break;
9353 			}
9354 		}
9355 	}
9356 
9357 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9358 	if (diff_algo_str) {
9359 		if (strcasecmp(diff_algo_str, "patience") == 0)
9360 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9361 		if (strcasecmp(diff_algo_str, "myers") == 0)
9362 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9363 	}
9364 
9365 	if (cmd == NULL) {
9366 		if (argc != 1)
9367 			usage(0, 1);
9368 		/* No command specified; try log with a path */
9369 		error = tog_log_with_path(argc, argv);
9370 	} else {
9371 		if (hflag)
9372 			cmd->cmd_usage();
9373 		else
9374 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9375 	}
9376 
9377 	endwin();
9378 	putchar('\n');
9379 	if (cmd_argv) {
9380 		int i;
9381 		for (i = 0; i < argc; i++)
9382 			free(cmd_argv[i]);
9383 		free(cmd_argv);
9384 	}
9385 
9386 	if (error && error->code != GOT_ERR_CANCELLED)
9387 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9388 	return 0;
9389 }