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 				if (s->head_ref_name == NULL ||
3794 				    err->code != GOT_ERR_NOT_REF)
3795 					return err;
3796 				/* Try to cope with deleted references. */
3797 				free(s->head_ref_name);
3798 				s->head_ref_name = NULL;
3799 				err = got_repo_match_object_id(&start_id,
3800 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3801 				    &tog_refs, s->repo);
3802 				if (err)
3803 					return err;
3804 			}
3805 			free(s->start_id);
3806 			s->start_id = start_id;
3807 			s->thread_args.start_id = s->start_id;
3808 		} else /* 'B' */
3809 			s->log_branches = !s->log_branches;
3810 
3811 		if (s->thread_args.pack_fds == NULL) {
3812 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3813 			if (err)
3814 				return err;
3815 		}
3816 		err = got_repo_open(&s->thread_args.repo,
3817 		    got_repo_get_path(s->repo), NULL,
3818 		    s->thread_args.pack_fds);
3819 		if (err)
3820 			return err;
3821 		tog_free_refs();
3822 		err = tog_load_refs(s->repo, 0);
3823 		if (err)
3824 			return err;
3825 		err = got_commit_graph_open(&s->thread_args.graph,
3826 		    s->in_repo_path, !s->log_branches);
3827 		if (err)
3828 			return err;
3829 		err = got_commit_graph_iter_start(s->thread_args.graph,
3830 		    s->start_id, s->repo, NULL, NULL);
3831 		if (err)
3832 			return err;
3833 		free_commits(&s->real_commits);
3834 		free_commits(&s->limit_commits);
3835 		s->first_displayed_entry = NULL;
3836 		s->last_displayed_entry = NULL;
3837 		s->selected_entry = NULL;
3838 		s->selected = 0;
3839 		s->thread_args.log_complete = 0;
3840 		s->quit = 0;
3841 		s->thread_args.commits_needed = view->lines;
3842 		s->matched_entry = NULL;
3843 		s->search_entry = NULL;
3844 		view->offset = 0;
3845 		break;
3846 	case 'R':
3847 		view->count = 0;
3848 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3849 		break;
3850 	default:
3851 		view->count = 0;
3852 		break;
3853 	}
3854 
3855 	return err;
3856 }
3857 
3858 static const struct got_error *
3859 apply_unveil(const char *repo_path, const char *worktree_path)
3860 {
3861 	const struct got_error *error;
3862 
3863 #ifdef PROFILE
3864 	if (unveil("gmon.out", "rwc") != 0)
3865 		return got_error_from_errno2("unveil", "gmon.out");
3866 #endif
3867 	if (repo_path && unveil(repo_path, "r") != 0)
3868 		return got_error_from_errno2("unveil", repo_path);
3869 
3870 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3871 		return got_error_from_errno2("unveil", worktree_path);
3872 
3873 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3874 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3875 
3876 	error = got_privsep_unveil_exec_helpers();
3877 	if (error != NULL)
3878 		return error;
3879 
3880 	if (unveil(NULL, NULL) != 0)
3881 		return got_error_from_errno("unveil");
3882 
3883 	return NULL;
3884 }
3885 
3886 static void
3887 init_curses(void)
3888 {
3889 	/*
3890 	 * Override default signal handlers before starting ncurses.
3891 	 * This should prevent ncurses from installing its own
3892 	 * broken cleanup() signal handler.
3893 	 */
3894 	signal(SIGWINCH, tog_sigwinch);
3895 	signal(SIGPIPE, tog_sigpipe);
3896 	signal(SIGCONT, tog_sigcont);
3897 	signal(SIGINT, tog_sigint);
3898 	signal(SIGTERM, tog_sigterm);
3899 
3900 	initscr();
3901 	cbreak();
3902 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3903 	noecho();
3904 	nonl();
3905 	intrflush(stdscr, FALSE);
3906 	keypad(stdscr, TRUE);
3907 	curs_set(0);
3908 	if (getenv("TOG_COLORS") != NULL) {
3909 		start_color();
3910 		use_default_colors();
3911 	}
3912 }
3913 
3914 static const struct got_error *
3915 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3916     struct got_repository *repo, struct got_worktree *worktree)
3917 {
3918 	const struct got_error *err = NULL;
3919 
3920 	if (argc == 0) {
3921 		*in_repo_path = strdup("/");
3922 		if (*in_repo_path == NULL)
3923 			return got_error_from_errno("strdup");
3924 		return NULL;
3925 	}
3926 
3927 	if (worktree) {
3928 		const char *prefix = got_worktree_get_path_prefix(worktree);
3929 		char *p;
3930 
3931 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3932 		if (err)
3933 			return err;
3934 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3935 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3936 		    p) == -1) {
3937 			err = got_error_from_errno("asprintf");
3938 			*in_repo_path = NULL;
3939 		}
3940 		free(p);
3941 	} else
3942 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3943 
3944 	return err;
3945 }
3946 
3947 static const struct got_error *
3948 cmd_log(int argc, char *argv[])
3949 {
3950 	const struct got_error *error;
3951 	struct got_repository *repo = NULL;
3952 	struct got_worktree *worktree = NULL;
3953 	struct got_object_id *start_id = NULL;
3954 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3955 	char *start_commit = NULL, *label = NULL;
3956 	struct got_reference *ref = NULL;
3957 	const char *head_ref_name = NULL;
3958 	int ch, log_branches = 0;
3959 	struct tog_view *view;
3960 	int *pack_fds = NULL;
3961 
3962 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3963 		switch (ch) {
3964 		case 'b':
3965 			log_branches = 1;
3966 			break;
3967 		case 'c':
3968 			start_commit = optarg;
3969 			break;
3970 		case 'r':
3971 			repo_path = realpath(optarg, NULL);
3972 			if (repo_path == NULL)
3973 				return got_error_from_errno2("realpath",
3974 				    optarg);
3975 			break;
3976 		default:
3977 			usage_log();
3978 			/* NOTREACHED */
3979 		}
3980 	}
3981 
3982 	argc -= optind;
3983 	argv += optind;
3984 
3985 	if (argc > 1)
3986 		usage_log();
3987 
3988 	error = got_repo_pack_fds_open(&pack_fds);
3989 	if (error != NULL)
3990 		goto done;
3991 
3992 	if (repo_path == NULL) {
3993 		cwd = getcwd(NULL, 0);
3994 		if (cwd == NULL)
3995 			return got_error_from_errno("getcwd");
3996 		error = got_worktree_open(&worktree, cwd);
3997 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3998 			goto done;
3999 		if (worktree)
4000 			repo_path =
4001 			    strdup(got_worktree_get_repo_path(worktree));
4002 		else
4003 			repo_path = strdup(cwd);
4004 		if (repo_path == NULL) {
4005 			error = got_error_from_errno("strdup");
4006 			goto done;
4007 		}
4008 	}
4009 
4010 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4011 	if (error != NULL)
4012 		goto done;
4013 
4014 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4015 	    repo, worktree);
4016 	if (error)
4017 		goto done;
4018 
4019 	init_curses();
4020 
4021 	error = apply_unveil(got_repo_get_path(repo),
4022 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4023 	if (error)
4024 		goto done;
4025 
4026 	/* already loaded by tog_log_with_path()? */
4027 	if (TAILQ_EMPTY(&tog_refs)) {
4028 		error = tog_load_refs(repo, 0);
4029 		if (error)
4030 			goto done;
4031 	}
4032 
4033 	if (start_commit == NULL) {
4034 		error = got_repo_match_object_id(&start_id, &label,
4035 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4036 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4037 		if (error)
4038 			goto done;
4039 		head_ref_name = label;
4040 	} else {
4041 		error = got_ref_open(&ref, repo, start_commit, 0);
4042 		if (error == NULL)
4043 			head_ref_name = got_ref_get_name(ref);
4044 		else if (error->code != GOT_ERR_NOT_REF)
4045 			goto done;
4046 		error = got_repo_match_object_id(&start_id, NULL,
4047 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4048 		if (error)
4049 			goto done;
4050 	}
4051 
4052 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4053 	if (view == NULL) {
4054 		error = got_error_from_errno("view_open");
4055 		goto done;
4056 	}
4057 	error = open_log_view(view, start_id, repo, head_ref_name,
4058 	    in_repo_path, log_branches);
4059 	if (error)
4060 		goto done;
4061 	if (worktree) {
4062 		/* Release work tree lock. */
4063 		got_worktree_close(worktree);
4064 		worktree = NULL;
4065 	}
4066 	error = view_loop(view);
4067 done:
4068 	free(in_repo_path);
4069 	free(repo_path);
4070 	free(cwd);
4071 	free(start_id);
4072 	free(label);
4073 	if (ref)
4074 		got_ref_close(ref);
4075 	if (repo) {
4076 		const struct got_error *close_err = got_repo_close(repo);
4077 		if (error == NULL)
4078 			error = close_err;
4079 	}
4080 	if (worktree)
4081 		got_worktree_close(worktree);
4082 	if (pack_fds) {
4083 		const struct got_error *pack_err =
4084 		    got_repo_pack_fds_close(pack_fds);
4085 		if (error == NULL)
4086 			error = pack_err;
4087 	}
4088 	tog_free_refs();
4089 	return error;
4090 }
4091 
4092 __dead static void
4093 usage_diff(void)
4094 {
4095 	endwin();
4096 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4097 	    "object1 object2\n", getprogname());
4098 	exit(1);
4099 }
4100 
4101 static int
4102 match_line(const char *line, regex_t *regex, size_t nmatch,
4103     regmatch_t *regmatch)
4104 {
4105 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4106 }
4107 
4108 static struct tog_color *
4109 match_color(struct tog_colors *colors, const char *line)
4110 {
4111 	struct tog_color *tc = NULL;
4112 
4113 	STAILQ_FOREACH(tc, colors, entry) {
4114 		if (match_line(line, &tc->regex, 0, NULL))
4115 			return tc;
4116 	}
4117 
4118 	return NULL;
4119 }
4120 
4121 static const struct got_error *
4122 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4123     WINDOW *window, int skipcol, regmatch_t *regmatch)
4124 {
4125 	const struct got_error *err = NULL;
4126 	char *exstr = NULL;
4127 	wchar_t *wline = NULL;
4128 	int rme, rms, n, width, scrollx;
4129 	int width0 = 0, width1 = 0, width2 = 0;
4130 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4131 
4132 	*wtotal = 0;
4133 
4134 	rms = regmatch->rm_so;
4135 	rme = regmatch->rm_eo;
4136 
4137 	err = expand_tab(&exstr, line);
4138 	if (err)
4139 		return err;
4140 
4141 	/* Split the line into 3 segments, according to match offsets. */
4142 	seg0 = strndup(exstr, rms);
4143 	if (seg0 == NULL) {
4144 		err = got_error_from_errno("strndup");
4145 		goto done;
4146 	}
4147 	seg1 = strndup(exstr + rms, rme - rms);
4148 	if (seg1 == NULL) {
4149 		err = got_error_from_errno("strndup");
4150 		goto done;
4151 	}
4152 	seg2 = strdup(exstr + rme);
4153 	if (seg2 == NULL) {
4154 		err = got_error_from_errno("strndup");
4155 		goto done;
4156 	}
4157 
4158 	/* draw up to matched token if we haven't scrolled past it */
4159 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4160 	    col_tab_align, 1);
4161 	if (err)
4162 		goto done;
4163 	n = MAX(width0 - skipcol, 0);
4164 	if (n) {
4165 		free(wline);
4166 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4167 		    wlimit, col_tab_align, 1);
4168 		if (err)
4169 			goto done;
4170 		waddwstr(window, &wline[scrollx]);
4171 		wlimit -= width;
4172 		*wtotal += width;
4173 	}
4174 
4175 	if (wlimit > 0) {
4176 		int i = 0, w = 0;
4177 		size_t wlen;
4178 
4179 		free(wline);
4180 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4181 		    col_tab_align, 1);
4182 		if (err)
4183 			goto done;
4184 		wlen = wcslen(wline);
4185 		while (i < wlen) {
4186 			width = wcwidth(wline[i]);
4187 			if (width == -1) {
4188 				/* should not happen, tabs are expanded */
4189 				err = got_error(GOT_ERR_RANGE);
4190 				goto done;
4191 			}
4192 			if (width0 + w + width > skipcol)
4193 				break;
4194 			w += width;
4195 			i++;
4196 		}
4197 		/* draw (visible part of) matched token (if scrolled into it) */
4198 		if (width1 - w > 0) {
4199 			wattron(window, A_STANDOUT);
4200 			waddwstr(window, &wline[i]);
4201 			wattroff(window, A_STANDOUT);
4202 			wlimit -= (width1 - w);
4203 			*wtotal += (width1 - w);
4204 		}
4205 	}
4206 
4207 	if (wlimit > 0) {  /* draw rest of line */
4208 		free(wline);
4209 		if (skipcol > width0 + width1) {
4210 			err = format_line(&wline, &width2, &scrollx, seg2,
4211 			    skipcol - (width0 + width1), wlimit,
4212 			    col_tab_align, 1);
4213 			if (err)
4214 				goto done;
4215 			waddwstr(window, &wline[scrollx]);
4216 		} else {
4217 			err = format_line(&wline, &width2, NULL, seg2, 0,
4218 			    wlimit, col_tab_align, 1);
4219 			if (err)
4220 				goto done;
4221 			waddwstr(window, wline);
4222 		}
4223 		*wtotal += width2;
4224 	}
4225 done:
4226 	free(wline);
4227 	free(exstr);
4228 	free(seg0);
4229 	free(seg1);
4230 	free(seg2);
4231 	return err;
4232 }
4233 
4234 static int
4235 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4236 {
4237 	FILE	*f = NULL;
4238 	int	*eof, *first, *selected;
4239 
4240 	if (view->type == TOG_VIEW_DIFF) {
4241 		struct tog_diff_view_state *s = &view->state.diff;
4242 
4243 		first = &s->first_displayed_line;
4244 		selected = first;
4245 		eof = &s->eof;
4246 		f = s->f;
4247 	} else if (view->type == TOG_VIEW_HELP) {
4248 		struct tog_help_view_state *s = &view->state.help;
4249 
4250 		first = &s->first_displayed_line;
4251 		selected = first;
4252 		eof = &s->eof;
4253 		f = s->f;
4254 	} else if (view->type == TOG_VIEW_BLAME) {
4255 		struct tog_blame_view_state *s = &view->state.blame;
4256 
4257 		first = &s->first_displayed_line;
4258 		selected = &s->selected_line;
4259 		eof = &s->eof;
4260 		f = s->blame.f;
4261 	} else
4262 		return 0;
4263 
4264 	/* Center gline in the middle of the page like vi(1). */
4265 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4266 		return 0;
4267 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4268 		rewind(f);
4269 		*eof = 0;
4270 		*first = 1;
4271 		*lineno = 0;
4272 		*nprinted = 0;
4273 		return 0;
4274 	}
4275 
4276 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4277 		view->gline : (view->nlines - 3) / 2 + 1;
4278 	view->gline = 0;
4279 
4280 	return 1;
4281 }
4282 
4283 static const struct got_error *
4284 draw_file(struct tog_view *view, const char *header)
4285 {
4286 	struct tog_diff_view_state *s = &view->state.diff;
4287 	regmatch_t *regmatch = &view->regmatch;
4288 	const struct got_error *err;
4289 	int nprinted = 0;
4290 	char *line;
4291 	size_t linesize = 0;
4292 	ssize_t linelen;
4293 	wchar_t *wline;
4294 	int width;
4295 	int max_lines = view->nlines;
4296 	int nlines = s->nlines;
4297 	off_t line_offset;
4298 
4299 	s->lineno = s->first_displayed_line - 1;
4300 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4301 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4302 		return got_error_from_errno("fseek");
4303 
4304 	werase(view->window);
4305 
4306 	if (view->gline > s->nlines - 1)
4307 		view->gline = s->nlines - 1;
4308 
4309 	if (header) {
4310 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4311 		    1 : view->gline - (view->nlines - 3) / 2 :
4312 		    s->lineno + s->selected_line;
4313 
4314 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4315 			return got_error_from_errno("asprintf");
4316 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4317 		    0, 0);
4318 		free(line);
4319 		if (err)
4320 			return err;
4321 
4322 		if (view_needs_focus_indication(view))
4323 			wstandout(view->window);
4324 		waddwstr(view->window, wline);
4325 		free(wline);
4326 		wline = NULL;
4327 		while (width++ < view->ncols)
4328 			waddch(view->window, ' ');
4329 		if (view_needs_focus_indication(view))
4330 			wstandend(view->window);
4331 
4332 		if (max_lines <= 1)
4333 			return NULL;
4334 		max_lines--;
4335 	}
4336 
4337 	s->eof = 0;
4338 	view->maxx = 0;
4339 	line = NULL;
4340 	while (max_lines > 0 && nprinted < max_lines) {
4341 		enum got_diff_line_type linetype;
4342 		attr_t attr = 0;
4343 
4344 		linelen = getline(&line, &linesize, s->f);
4345 		if (linelen == -1) {
4346 			if (feof(s->f)) {
4347 				s->eof = 1;
4348 				break;
4349 			}
4350 			free(line);
4351 			return got_ferror(s->f, GOT_ERR_IO);
4352 		}
4353 
4354 		if (++s->lineno < s->first_displayed_line)
4355 			continue;
4356 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4357 			continue;
4358 		if (s->lineno == view->hiline)
4359 			attr = A_STANDOUT;
4360 
4361 		/* Set view->maxx based on full line length. */
4362 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4363 		    view->x ? 1 : 0);
4364 		if (err) {
4365 			free(line);
4366 			return err;
4367 		}
4368 		view->maxx = MAX(view->maxx, width);
4369 		free(wline);
4370 		wline = NULL;
4371 
4372 		linetype = s->lines[s->lineno].type;
4373 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4374 		    linetype < GOT_DIFF_LINE_CONTEXT)
4375 			attr |= COLOR_PAIR(linetype);
4376 		if (attr)
4377 			wattron(view->window, attr);
4378 		if (s->first_displayed_line + nprinted == s->matched_line &&
4379 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4380 			err = add_matched_line(&width, line, view->ncols, 0,
4381 			    view->window, view->x, regmatch);
4382 			if (err) {
4383 				free(line);
4384 				return err;
4385 			}
4386 		} else {
4387 			int skip;
4388 			err = format_line(&wline, &width, &skip, line,
4389 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4390 			if (err) {
4391 				free(line);
4392 				return err;
4393 			}
4394 			waddwstr(view->window, &wline[skip]);
4395 			free(wline);
4396 			wline = NULL;
4397 		}
4398 		if (s->lineno == view->hiline) {
4399 			/* highlight full gline length */
4400 			while (width++ < view->ncols)
4401 				waddch(view->window, ' ');
4402 		} else {
4403 			if (width <= view->ncols - 1)
4404 				waddch(view->window, '\n');
4405 		}
4406 		if (attr)
4407 			wattroff(view->window, attr);
4408 		if (++nprinted == 1)
4409 			s->first_displayed_line = s->lineno;
4410 	}
4411 	free(line);
4412 	if (nprinted >= 1)
4413 		s->last_displayed_line = s->first_displayed_line +
4414 		    (nprinted - 1);
4415 	else
4416 		s->last_displayed_line = s->first_displayed_line;
4417 
4418 	view_border(view);
4419 
4420 	if (s->eof) {
4421 		while (nprinted < view->nlines) {
4422 			waddch(view->window, '\n');
4423 			nprinted++;
4424 		}
4425 
4426 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4427 		    view->ncols, 0, 0);
4428 		if (err) {
4429 			return err;
4430 		}
4431 
4432 		wstandout(view->window);
4433 		waddwstr(view->window, wline);
4434 		free(wline);
4435 		wline = NULL;
4436 		wstandend(view->window);
4437 	}
4438 
4439 	return NULL;
4440 }
4441 
4442 static char *
4443 get_datestr(time_t *time, char *datebuf)
4444 {
4445 	struct tm mytm, *tm;
4446 	char *p, *s;
4447 
4448 	tm = gmtime_r(time, &mytm);
4449 	if (tm == NULL)
4450 		return NULL;
4451 	s = asctime_r(tm, datebuf);
4452 	if (s == NULL)
4453 		return NULL;
4454 	p = strchr(s, '\n');
4455 	if (p)
4456 		*p = '\0';
4457 	return s;
4458 }
4459 
4460 static const struct got_error *
4461 get_changed_paths(struct got_pathlist_head *paths,
4462     struct got_commit_object *commit, struct got_repository *repo)
4463 {
4464 	const struct got_error *err = NULL;
4465 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4466 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4467 	struct got_object_qid *qid;
4468 
4469 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4470 	if (qid != NULL) {
4471 		struct got_commit_object *pcommit;
4472 		err = got_object_open_as_commit(&pcommit, repo,
4473 		    &qid->id);
4474 		if (err)
4475 			return err;
4476 
4477 		tree_id1 = got_object_id_dup(
4478 		    got_object_commit_get_tree_id(pcommit));
4479 		if (tree_id1 == NULL) {
4480 			got_object_commit_close(pcommit);
4481 			return got_error_from_errno("got_object_id_dup");
4482 		}
4483 		got_object_commit_close(pcommit);
4484 
4485 	}
4486 
4487 	if (tree_id1) {
4488 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4489 		if (err)
4490 			goto done;
4491 	}
4492 
4493 	tree_id2 = got_object_commit_get_tree_id(commit);
4494 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4495 	if (err)
4496 		goto done;
4497 
4498 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4499 	    got_diff_tree_collect_changed_paths, paths, 0);
4500 done:
4501 	if (tree1)
4502 		got_object_tree_close(tree1);
4503 	if (tree2)
4504 		got_object_tree_close(tree2);
4505 	free(tree_id1);
4506 	return err;
4507 }
4508 
4509 static const struct got_error *
4510 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4511     off_t off, uint8_t type)
4512 {
4513 	struct got_diff_line *p;
4514 
4515 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4516 	if (p == NULL)
4517 		return got_error_from_errno("reallocarray");
4518 	*lines = p;
4519 	(*lines)[*nlines].offset = off;
4520 	(*lines)[*nlines].type = type;
4521 	(*nlines)++;
4522 
4523 	return NULL;
4524 }
4525 
4526 static const struct got_error *
4527 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4528     struct got_object_id *commit_id, struct got_reflist_head *refs,
4529     struct got_repository *repo, FILE *outfile)
4530 {
4531 	const struct got_error *err = NULL;
4532 	char datebuf[26], *datestr;
4533 	struct got_commit_object *commit;
4534 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4535 	time_t committer_time;
4536 	const char *author, *committer;
4537 	char *refs_str = NULL;
4538 	struct got_pathlist_head changed_paths;
4539 	struct got_pathlist_entry *pe;
4540 	off_t outoff = 0;
4541 	int n;
4542 
4543 	TAILQ_INIT(&changed_paths);
4544 
4545 	if (refs) {
4546 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4547 		if (err)
4548 			return err;
4549 	}
4550 
4551 	err = got_object_open_as_commit(&commit, repo, commit_id);
4552 	if (err)
4553 		return err;
4554 
4555 	err = got_object_id_str(&id_str, commit_id);
4556 	if (err) {
4557 		err = got_error_from_errno("got_object_id_str");
4558 		goto done;
4559 	}
4560 
4561 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4562 	if (err)
4563 		goto done;
4564 
4565 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4566 	    refs_str ? refs_str : "", refs_str ? ")" : "");
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_META);
4573 	if (err)
4574 		goto done;
4575 
4576 	n = fprintf(outfile, "from: %s\n",
4577 	    got_object_commit_get_author(commit));
4578 	if (n < 0) {
4579 		err = got_error_from_errno("fprintf");
4580 		goto done;
4581 	}
4582 	outoff += n;
4583 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4584 	if (err)
4585 		goto done;
4586 
4587 	committer_time = got_object_commit_get_committer_time(commit);
4588 	datestr = get_datestr(&committer_time, datebuf);
4589 	if (datestr) {
4590 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4591 		if (n < 0) {
4592 			err = got_error_from_errno("fprintf");
4593 			goto done;
4594 		}
4595 		outoff += n;
4596 		err = add_line_metadata(lines, nlines, outoff,
4597 		    GOT_DIFF_LINE_DATE);
4598 		if (err)
4599 			goto done;
4600 	}
4601 	author = got_object_commit_get_author(commit);
4602 	committer = got_object_commit_get_committer(commit);
4603 	if (strcmp(author, committer) != 0) {
4604 		n = fprintf(outfile, "via: %s\n", committer);
4605 		if (n < 0) {
4606 			err = got_error_from_errno("fprintf");
4607 			goto done;
4608 		}
4609 		outoff += n;
4610 		err = add_line_metadata(lines, nlines, outoff,
4611 		    GOT_DIFF_LINE_AUTHOR);
4612 		if (err)
4613 			goto done;
4614 	}
4615 	if (got_object_commit_get_nparents(commit) > 1) {
4616 		const struct got_object_id_queue *parent_ids;
4617 		struct got_object_qid *qid;
4618 		int pn = 1;
4619 		parent_ids = got_object_commit_get_parent_ids(commit);
4620 		STAILQ_FOREACH(qid, parent_ids, entry) {
4621 			err = got_object_id_str(&id_str, &qid->id);
4622 			if (err)
4623 				goto done;
4624 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4625 			if (n < 0) {
4626 				err = got_error_from_errno("fprintf");
4627 				goto done;
4628 			}
4629 			outoff += n;
4630 			err = add_line_metadata(lines, nlines, outoff,
4631 			    GOT_DIFF_LINE_META);
4632 			if (err)
4633 				goto done;
4634 			free(id_str);
4635 			id_str = NULL;
4636 		}
4637 	}
4638 
4639 	err = got_object_commit_get_logmsg(&logmsg, commit);
4640 	if (err)
4641 		goto done;
4642 	s = logmsg;
4643 	while ((line = strsep(&s, "\n")) != NULL) {
4644 		n = fprintf(outfile, "%s\n", line);
4645 		if (n < 0) {
4646 			err = got_error_from_errno("fprintf");
4647 			goto done;
4648 		}
4649 		outoff += n;
4650 		err = add_line_metadata(lines, nlines, outoff,
4651 		    GOT_DIFF_LINE_LOGMSG);
4652 		if (err)
4653 			goto done;
4654 	}
4655 
4656 	err = get_changed_paths(&changed_paths, commit, repo);
4657 	if (err)
4658 		goto done;
4659 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4660 		struct got_diff_changed_path *cp = pe->data;
4661 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4662 		if (n < 0) {
4663 			err = got_error_from_errno("fprintf");
4664 			goto done;
4665 		}
4666 		outoff += n;
4667 		err = add_line_metadata(lines, nlines, outoff,
4668 		    GOT_DIFF_LINE_CHANGES);
4669 		if (err)
4670 			goto done;
4671 		free((char *)pe->path);
4672 		free(pe->data);
4673 	}
4674 
4675 	fputc('\n', outfile);
4676 	outoff++;
4677 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4678 done:
4679 	got_pathlist_free(&changed_paths);
4680 	free(id_str);
4681 	free(logmsg);
4682 	free(refs_str);
4683 	got_object_commit_close(commit);
4684 	if (err) {
4685 		free(*lines);
4686 		*lines = NULL;
4687 		*nlines = 0;
4688 	}
4689 	return err;
4690 }
4691 
4692 static const struct got_error *
4693 create_diff(struct tog_diff_view_state *s)
4694 {
4695 	const struct got_error *err = NULL;
4696 	FILE *f = NULL;
4697 	int obj_type;
4698 
4699 	free(s->lines);
4700 	s->lines = malloc(sizeof(*s->lines));
4701 	if (s->lines == NULL)
4702 		return got_error_from_errno("malloc");
4703 	s->nlines = 0;
4704 
4705 	f = got_opentemp();
4706 	if (f == NULL) {
4707 		err = got_error_from_errno("got_opentemp");
4708 		goto done;
4709 	}
4710 	if (s->f && fclose(s->f) == EOF) {
4711 		err = got_error_from_errno("fclose");
4712 		goto done;
4713 	}
4714 	s->f = f;
4715 
4716 	if (s->id1)
4717 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4718 	else
4719 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4720 	if (err)
4721 		goto done;
4722 
4723 	switch (obj_type) {
4724 	case GOT_OBJ_TYPE_BLOB:
4725 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4726 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4727 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4728 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4729 		break;
4730 	case GOT_OBJ_TYPE_TREE:
4731 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4732 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4733 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4734 		    s->force_text_diff, s->repo, s->f);
4735 		break;
4736 	case GOT_OBJ_TYPE_COMMIT: {
4737 		const struct got_object_id_queue *parent_ids;
4738 		struct got_object_qid *pid;
4739 		struct got_commit_object *commit2;
4740 		struct got_reflist_head *refs;
4741 
4742 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4743 		if (err)
4744 			goto done;
4745 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4746 		/* Show commit info if we're diffing to a parent/root commit. */
4747 		if (s->id1 == NULL) {
4748 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4749 			    refs, s->repo, s->f);
4750 			if (err)
4751 				goto done;
4752 		} else {
4753 			parent_ids = got_object_commit_get_parent_ids(commit2);
4754 			STAILQ_FOREACH(pid, parent_ids, entry) {
4755 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4756 					err = write_commit_info(&s->lines,
4757 					    &s->nlines, s->id2, refs, s->repo,
4758 					    s->f);
4759 					if (err)
4760 						goto done;
4761 					break;
4762 				}
4763 			}
4764 		}
4765 		got_object_commit_close(commit2);
4766 
4767 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4768 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4769 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4770 		    s->force_text_diff, s->repo, s->f);
4771 		break;
4772 	}
4773 	default:
4774 		err = got_error(GOT_ERR_OBJ_TYPE);
4775 		break;
4776 	}
4777 done:
4778 	if (s->f && fflush(s->f) != 0 && err == NULL)
4779 		err = got_error_from_errno("fflush");
4780 	return err;
4781 }
4782 
4783 static void
4784 diff_view_indicate_progress(struct tog_view *view)
4785 {
4786 	mvwaddstr(view->window, 0, 0, "diffing...");
4787 	update_panels();
4788 	doupdate();
4789 }
4790 
4791 static const struct got_error *
4792 search_start_diff_view(struct tog_view *view)
4793 {
4794 	struct tog_diff_view_state *s = &view->state.diff;
4795 
4796 	s->matched_line = 0;
4797 	return NULL;
4798 }
4799 
4800 static void
4801 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4802     size_t *nlines, int **first, int **last, int **match, int **selected)
4803 {
4804 	struct tog_diff_view_state *s = &view->state.diff;
4805 
4806 	*f = s->f;
4807 	*nlines = s->nlines;
4808 	*line_offsets = NULL;
4809 	*match = &s->matched_line;
4810 	*first = &s->first_displayed_line;
4811 	*last = &s->last_displayed_line;
4812 	*selected = &s->selected_line;
4813 }
4814 
4815 static const struct got_error *
4816 search_next_view_match(struct tog_view *view)
4817 {
4818 	const struct got_error *err = NULL;
4819 	FILE *f;
4820 	int lineno;
4821 	char *line = NULL;
4822 	size_t linesize = 0;
4823 	ssize_t linelen;
4824 	off_t *line_offsets;
4825 	size_t nlines = 0;
4826 	int *first, *last, *match, *selected;
4827 
4828 	if (!view->search_setup)
4829 		return got_error_msg(GOT_ERR_NOT_IMPL,
4830 		    "view search not supported");
4831 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4832 	    &match, &selected);
4833 
4834 	if (!view->searching) {
4835 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4836 		return NULL;
4837 	}
4838 
4839 	if (*match) {
4840 		if (view->searching == TOG_SEARCH_FORWARD)
4841 			lineno = *match + 1;
4842 		else
4843 			lineno = *match - 1;
4844 	} else
4845 		lineno = *first - 1 + *selected;
4846 
4847 	while (1) {
4848 		off_t offset;
4849 
4850 		if (lineno <= 0 || lineno > nlines) {
4851 			if (*match == 0) {
4852 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4853 				break;
4854 			}
4855 
4856 			if (view->searching == TOG_SEARCH_FORWARD)
4857 				lineno = 1;
4858 			else
4859 				lineno = nlines;
4860 		}
4861 
4862 		offset = view->type == TOG_VIEW_DIFF ?
4863 		    view->state.diff.lines[lineno - 1].offset :
4864 		    line_offsets[lineno - 1];
4865 		if (fseeko(f, offset, SEEK_SET) != 0) {
4866 			free(line);
4867 			return got_error_from_errno("fseeko");
4868 		}
4869 		linelen = getline(&line, &linesize, f);
4870 		if (linelen != -1) {
4871 			char *exstr;
4872 			err = expand_tab(&exstr, line);
4873 			if (err)
4874 				break;
4875 			if (match_line(exstr, &view->regex, 1,
4876 			    &view->regmatch)) {
4877 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4878 				*match = lineno;
4879 				free(exstr);
4880 				break;
4881 			}
4882 			free(exstr);
4883 		}
4884 		if (view->searching == TOG_SEARCH_FORWARD)
4885 			lineno++;
4886 		else
4887 			lineno--;
4888 	}
4889 	free(line);
4890 
4891 	if (*match) {
4892 		*first = *match;
4893 		*selected = 1;
4894 	}
4895 
4896 	return err;
4897 }
4898 
4899 static const struct got_error *
4900 close_diff_view(struct tog_view *view)
4901 {
4902 	const struct got_error *err = NULL;
4903 	struct tog_diff_view_state *s = &view->state.diff;
4904 
4905 	free(s->id1);
4906 	s->id1 = NULL;
4907 	free(s->id2);
4908 	s->id2 = NULL;
4909 	if (s->f && fclose(s->f) == EOF)
4910 		err = got_error_from_errno("fclose");
4911 	s->f = NULL;
4912 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4913 		err = got_error_from_errno("fclose");
4914 	s->f1 = NULL;
4915 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4916 		err = got_error_from_errno("fclose");
4917 	s->f2 = NULL;
4918 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4919 		err = got_error_from_errno("close");
4920 	s->fd1 = -1;
4921 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4922 		err = got_error_from_errno("close");
4923 	s->fd2 = -1;
4924 	free(s->lines);
4925 	s->lines = NULL;
4926 	s->nlines = 0;
4927 	return err;
4928 }
4929 
4930 static const struct got_error *
4931 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4932     struct got_object_id *id2, const char *label1, const char *label2,
4933     int diff_context, int ignore_whitespace, int force_text_diff,
4934     struct tog_view *parent_view, struct got_repository *repo)
4935 {
4936 	const struct got_error *err;
4937 	struct tog_diff_view_state *s = &view->state.diff;
4938 
4939 	memset(s, 0, sizeof(*s));
4940 	s->fd1 = -1;
4941 	s->fd2 = -1;
4942 
4943 	if (id1 != NULL && id2 != NULL) {
4944 	    int type1, type2;
4945 	    err = got_object_get_type(&type1, repo, id1);
4946 	    if (err)
4947 		return err;
4948 	    err = got_object_get_type(&type2, repo, id2);
4949 	    if (err)
4950 		return err;
4951 
4952 	    if (type1 != type2)
4953 		return got_error(GOT_ERR_OBJ_TYPE);
4954 	}
4955 	s->first_displayed_line = 1;
4956 	s->last_displayed_line = view->nlines;
4957 	s->selected_line = 1;
4958 	s->repo = repo;
4959 	s->id1 = id1;
4960 	s->id2 = id2;
4961 	s->label1 = label1;
4962 	s->label2 = label2;
4963 
4964 	if (id1) {
4965 		s->id1 = got_object_id_dup(id1);
4966 		if (s->id1 == NULL)
4967 			return got_error_from_errno("got_object_id_dup");
4968 	} else
4969 		s->id1 = NULL;
4970 
4971 	s->id2 = got_object_id_dup(id2);
4972 	if (s->id2 == NULL) {
4973 		err = got_error_from_errno("got_object_id_dup");
4974 		goto done;
4975 	}
4976 
4977 	s->f1 = got_opentemp();
4978 	if (s->f1 == NULL) {
4979 		err = got_error_from_errno("got_opentemp");
4980 		goto done;
4981 	}
4982 
4983 	s->f2 = got_opentemp();
4984 	if (s->f2 == NULL) {
4985 		err = got_error_from_errno("got_opentemp");
4986 		goto done;
4987 	}
4988 
4989 	s->fd1 = got_opentempfd();
4990 	if (s->fd1 == -1) {
4991 		err = got_error_from_errno("got_opentempfd");
4992 		goto done;
4993 	}
4994 
4995 	s->fd2 = got_opentempfd();
4996 	if (s->fd2 == -1) {
4997 		err = got_error_from_errno("got_opentempfd");
4998 		goto done;
4999 	}
5000 
5001 	s->first_displayed_line = 1;
5002 	s->last_displayed_line = view->nlines;
5003 	s->diff_context = diff_context;
5004 	s->ignore_whitespace = ignore_whitespace;
5005 	s->force_text_diff = force_text_diff;
5006 	s->parent_view = parent_view;
5007 	s->repo = repo;
5008 
5009 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5010 		int rc;
5011 
5012 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5013 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5014 		if (rc != ERR)
5015 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5016 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5017 		if (rc != ERR)
5018 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5019 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5020 		if (rc != ERR)
5021 			rc = init_pair(GOT_DIFF_LINE_META,
5022 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5023 		if (rc != ERR)
5024 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5025 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5026 		if (rc != ERR)
5027 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5028 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5029 		if (rc != ERR)
5030 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5031 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5032 		if (rc != ERR)
5033 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5034 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5035 		if (rc != ERR)
5036 			rc = init_pair(GOT_DIFF_LINE_DATE,
5037 			    get_color_value("TOG_COLOR_DATE"), -1);
5038 		if (rc == ERR) {
5039 			err = got_error(GOT_ERR_RANGE);
5040 			goto done;
5041 		}
5042 	}
5043 
5044 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5045 	    view_is_splitscreen(view))
5046 		show_log_view(parent_view); /* draw border */
5047 	diff_view_indicate_progress(view);
5048 
5049 	err = create_diff(s);
5050 
5051 	view->show = show_diff_view;
5052 	view->input = input_diff_view;
5053 	view->reset = reset_diff_view;
5054 	view->close = close_diff_view;
5055 	view->search_start = search_start_diff_view;
5056 	view->search_setup = search_setup_diff_view;
5057 	view->search_next = search_next_view_match;
5058 done:
5059 	if (err)
5060 		close_diff_view(view);
5061 	return err;
5062 }
5063 
5064 static const struct got_error *
5065 show_diff_view(struct tog_view *view)
5066 {
5067 	const struct got_error *err;
5068 	struct tog_diff_view_state *s = &view->state.diff;
5069 	char *id_str1 = NULL, *id_str2, *header;
5070 	const char *label1, *label2;
5071 
5072 	if (s->id1) {
5073 		err = got_object_id_str(&id_str1, s->id1);
5074 		if (err)
5075 			return err;
5076 		label1 = s->label1 ? s->label1 : id_str1;
5077 	} else
5078 		label1 = "/dev/null";
5079 
5080 	err = got_object_id_str(&id_str2, s->id2);
5081 	if (err)
5082 		return err;
5083 	label2 = s->label2 ? s->label2 : id_str2;
5084 
5085 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5086 		err = got_error_from_errno("asprintf");
5087 		free(id_str1);
5088 		free(id_str2);
5089 		return err;
5090 	}
5091 	free(id_str1);
5092 	free(id_str2);
5093 
5094 	err = draw_file(view, header);
5095 	free(header);
5096 	return err;
5097 }
5098 
5099 static const struct got_error *
5100 set_selected_commit(struct tog_diff_view_state *s,
5101     struct commit_queue_entry *entry)
5102 {
5103 	const struct got_error *err;
5104 	const struct got_object_id_queue *parent_ids;
5105 	struct got_commit_object *selected_commit;
5106 	struct got_object_qid *pid;
5107 
5108 	free(s->id2);
5109 	s->id2 = got_object_id_dup(entry->id);
5110 	if (s->id2 == NULL)
5111 		return got_error_from_errno("got_object_id_dup");
5112 
5113 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5114 	if (err)
5115 		return err;
5116 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5117 	free(s->id1);
5118 	pid = STAILQ_FIRST(parent_ids);
5119 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5120 	got_object_commit_close(selected_commit);
5121 	return NULL;
5122 }
5123 
5124 static const struct got_error *
5125 reset_diff_view(struct tog_view *view)
5126 {
5127 	struct tog_diff_view_state *s = &view->state.diff;
5128 
5129 	view->count = 0;
5130 	wclear(view->window);
5131 	s->first_displayed_line = 1;
5132 	s->last_displayed_line = view->nlines;
5133 	s->matched_line = 0;
5134 	diff_view_indicate_progress(view);
5135 	return create_diff(s);
5136 }
5137 
5138 static void
5139 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5140 {
5141 	int start, i;
5142 
5143 	i = start = s->first_displayed_line - 1;
5144 
5145 	while (s->lines[i].type != type) {
5146 		if (i == 0)
5147 			i = s->nlines - 1;
5148 		if (--i == start)
5149 			return; /* do nothing, requested type not in file */
5150 	}
5151 
5152 	s->selected_line = 1;
5153 	s->first_displayed_line = i;
5154 }
5155 
5156 static void
5157 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5158 {
5159 	int start, i;
5160 
5161 	i = start = s->first_displayed_line + 1;
5162 
5163 	while (s->lines[i].type != type) {
5164 		if (i == s->nlines - 1)
5165 			i = 0;
5166 		if (++i == start)
5167 			return; /* do nothing, requested type not in file */
5168 	}
5169 
5170 	s->selected_line = 1;
5171 	s->first_displayed_line = i;
5172 }
5173 
5174 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5175     int, int, int);
5176 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5177     int, int);
5178 
5179 static const struct got_error *
5180 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5181 {
5182 	const struct got_error *err = NULL;
5183 	struct tog_diff_view_state *s = &view->state.diff;
5184 	struct tog_log_view_state *ls;
5185 	struct commit_queue_entry *old_selected_entry;
5186 	char *line = NULL;
5187 	size_t linesize = 0;
5188 	ssize_t linelen;
5189 	int i, nscroll = view->nlines - 1, up = 0;
5190 
5191 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5192 
5193 	switch (ch) {
5194 	case '0':
5195 		view->x = 0;
5196 		break;
5197 	case '$':
5198 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5199 		view->count = 0;
5200 		break;
5201 	case KEY_RIGHT:
5202 	case 'l':
5203 		if (view->x + view->ncols / 3 < view->maxx)
5204 			view->x += 2;  /* move two columns right */
5205 		else
5206 			view->count = 0;
5207 		break;
5208 	case KEY_LEFT:
5209 	case 'h':
5210 		view->x -= MIN(view->x, 2);  /* move two columns back */
5211 		if (view->x <= 0)
5212 			view->count = 0;
5213 		break;
5214 	case 'a':
5215 	case 'w':
5216 		if (ch == 'a')
5217 			s->force_text_diff = !s->force_text_diff;
5218 		if (ch == 'w')
5219 			s->ignore_whitespace = !s->ignore_whitespace;
5220 		err = reset_diff_view(view);
5221 		break;
5222 	case 'g':
5223 	case KEY_HOME:
5224 		s->first_displayed_line = 1;
5225 		view->count = 0;
5226 		break;
5227 	case 'G':
5228 	case KEY_END:
5229 		view->count = 0;
5230 		if (s->eof)
5231 			break;
5232 
5233 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5234 		s->eof = 1;
5235 		break;
5236 	case 'k':
5237 	case KEY_UP:
5238 	case CTRL('p'):
5239 		if (s->first_displayed_line > 1)
5240 			s->first_displayed_line--;
5241 		else
5242 			view->count = 0;
5243 		break;
5244 	case CTRL('u'):
5245 	case 'u':
5246 		nscroll /= 2;
5247 		/* FALL THROUGH */
5248 	case KEY_PPAGE:
5249 	case CTRL('b'):
5250 	case 'b':
5251 		if (s->first_displayed_line == 1) {
5252 			view->count = 0;
5253 			break;
5254 		}
5255 		i = 0;
5256 		while (i++ < nscroll && s->first_displayed_line > 1)
5257 			s->first_displayed_line--;
5258 		break;
5259 	case 'j':
5260 	case KEY_DOWN:
5261 	case CTRL('n'):
5262 		if (!s->eof)
5263 			s->first_displayed_line++;
5264 		else
5265 			view->count = 0;
5266 		break;
5267 	case CTRL('d'):
5268 	case 'd':
5269 		nscroll /= 2;
5270 		/* FALL THROUGH */
5271 	case KEY_NPAGE:
5272 	case CTRL('f'):
5273 	case 'f':
5274 	case ' ':
5275 		if (s->eof) {
5276 			view->count = 0;
5277 			break;
5278 		}
5279 		i = 0;
5280 		while (!s->eof && i++ < nscroll) {
5281 			linelen = getline(&line, &linesize, s->f);
5282 			s->first_displayed_line++;
5283 			if (linelen == -1) {
5284 				if (feof(s->f)) {
5285 					s->eof = 1;
5286 				} else
5287 					err = got_ferror(s->f, GOT_ERR_IO);
5288 				break;
5289 			}
5290 		}
5291 		free(line);
5292 		break;
5293 	case '(':
5294 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5295 		break;
5296 	case ')':
5297 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5298 		break;
5299 	case '{':
5300 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5301 		break;
5302 	case '}':
5303 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5304 		break;
5305 	case '[':
5306 		if (s->diff_context > 0) {
5307 			s->diff_context--;
5308 			s->matched_line = 0;
5309 			diff_view_indicate_progress(view);
5310 			err = create_diff(s);
5311 			if (s->first_displayed_line + view->nlines - 1 >
5312 			    s->nlines) {
5313 				s->first_displayed_line = 1;
5314 				s->last_displayed_line = view->nlines;
5315 			}
5316 		} else
5317 			view->count = 0;
5318 		break;
5319 	case ']':
5320 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5321 			s->diff_context++;
5322 			s->matched_line = 0;
5323 			diff_view_indicate_progress(view);
5324 			err = create_diff(s);
5325 		} else
5326 			view->count = 0;
5327 		break;
5328 	case '<':
5329 	case ',':
5330 	case 'K':
5331 		up = 1;
5332 		/* FALL THROUGH */
5333 	case '>':
5334 	case '.':
5335 	case 'J':
5336 		if (s->parent_view == NULL) {
5337 			view->count = 0;
5338 			break;
5339 		}
5340 		s->parent_view->count = view->count;
5341 
5342 		if (s->parent_view->type == TOG_VIEW_LOG) {
5343 			ls = &s->parent_view->state.log;
5344 			old_selected_entry = ls->selected_entry;
5345 
5346 			err = input_log_view(NULL, s->parent_view,
5347 			    up ? KEY_UP : KEY_DOWN);
5348 			if (err)
5349 				break;
5350 			view->count = s->parent_view->count;
5351 
5352 			if (old_selected_entry == ls->selected_entry)
5353 				break;
5354 
5355 			err = set_selected_commit(s, ls->selected_entry);
5356 			if (err)
5357 				break;
5358 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5359 			struct tog_blame_view_state *bs;
5360 			struct got_object_id *id, *prev_id;
5361 
5362 			bs = &s->parent_view->state.blame;
5363 			prev_id = get_annotation_for_line(bs->blame.lines,
5364 			    bs->blame.nlines, bs->last_diffed_line);
5365 
5366 			err = input_blame_view(&view, s->parent_view,
5367 			    up ? KEY_UP : KEY_DOWN);
5368 			if (err)
5369 				break;
5370 			view->count = s->parent_view->count;
5371 
5372 			if (prev_id == NULL)
5373 				break;
5374 			id = get_selected_commit_id(bs->blame.lines,
5375 			    bs->blame.nlines, bs->first_displayed_line,
5376 			    bs->selected_line);
5377 			if (id == NULL)
5378 				break;
5379 
5380 			if (!got_object_id_cmp(prev_id, id))
5381 				break;
5382 
5383 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5384 			if (err)
5385 				break;
5386 		}
5387 		s->first_displayed_line = 1;
5388 		s->last_displayed_line = view->nlines;
5389 		s->matched_line = 0;
5390 		view->x = 0;
5391 
5392 		diff_view_indicate_progress(view);
5393 		err = create_diff(s);
5394 		break;
5395 	default:
5396 		view->count = 0;
5397 		break;
5398 	}
5399 
5400 	return err;
5401 }
5402 
5403 static const struct got_error *
5404 cmd_diff(int argc, char *argv[])
5405 {
5406 	const struct got_error *error = NULL;
5407 	struct got_repository *repo = NULL;
5408 	struct got_worktree *worktree = NULL;
5409 	struct got_object_id *id1 = NULL, *id2 = NULL;
5410 	char *repo_path = NULL, *cwd = NULL;
5411 	char *id_str1 = NULL, *id_str2 = NULL;
5412 	char *label1 = NULL, *label2 = NULL;
5413 	int diff_context = 3, ignore_whitespace = 0;
5414 	int ch, force_text_diff = 0;
5415 	const char *errstr;
5416 	struct tog_view *view;
5417 	int *pack_fds = NULL;
5418 
5419 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5420 		switch (ch) {
5421 		case 'a':
5422 			force_text_diff = 1;
5423 			break;
5424 		case 'C':
5425 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5426 			    &errstr);
5427 			if (errstr != NULL)
5428 				errx(1, "number of context lines is %s: %s",
5429 				    errstr, errstr);
5430 			break;
5431 		case 'r':
5432 			repo_path = realpath(optarg, NULL);
5433 			if (repo_path == NULL)
5434 				return got_error_from_errno2("realpath",
5435 				    optarg);
5436 			got_path_strip_trailing_slashes(repo_path);
5437 			break;
5438 		case 'w':
5439 			ignore_whitespace = 1;
5440 			break;
5441 		default:
5442 			usage_diff();
5443 			/* NOTREACHED */
5444 		}
5445 	}
5446 
5447 	argc -= optind;
5448 	argv += optind;
5449 
5450 	if (argc == 0) {
5451 		usage_diff(); /* TODO show local worktree changes */
5452 	} else if (argc == 2) {
5453 		id_str1 = argv[0];
5454 		id_str2 = argv[1];
5455 	} else
5456 		usage_diff();
5457 
5458 	error = got_repo_pack_fds_open(&pack_fds);
5459 	if (error)
5460 		goto done;
5461 
5462 	if (repo_path == NULL) {
5463 		cwd = getcwd(NULL, 0);
5464 		if (cwd == NULL)
5465 			return got_error_from_errno("getcwd");
5466 		error = got_worktree_open(&worktree, cwd);
5467 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5468 			goto done;
5469 		if (worktree)
5470 			repo_path =
5471 			    strdup(got_worktree_get_repo_path(worktree));
5472 		else
5473 			repo_path = strdup(cwd);
5474 		if (repo_path == NULL) {
5475 			error = got_error_from_errno("strdup");
5476 			goto done;
5477 		}
5478 	}
5479 
5480 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5481 	if (error)
5482 		goto done;
5483 
5484 	init_curses();
5485 
5486 	error = apply_unveil(got_repo_get_path(repo), NULL);
5487 	if (error)
5488 		goto done;
5489 
5490 	error = tog_load_refs(repo, 0);
5491 	if (error)
5492 		goto done;
5493 
5494 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5495 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5496 	if (error)
5497 		goto done;
5498 
5499 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5500 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5501 	if (error)
5502 		goto done;
5503 
5504 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5505 	if (view == NULL) {
5506 		error = got_error_from_errno("view_open");
5507 		goto done;
5508 	}
5509 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5510 	    ignore_whitespace, force_text_diff, NULL,  repo);
5511 	if (error)
5512 		goto done;
5513 	error = view_loop(view);
5514 done:
5515 	free(label1);
5516 	free(label2);
5517 	free(repo_path);
5518 	free(cwd);
5519 	if (repo) {
5520 		const struct got_error *close_err = got_repo_close(repo);
5521 		if (error == NULL)
5522 			error = close_err;
5523 	}
5524 	if (worktree)
5525 		got_worktree_close(worktree);
5526 	if (pack_fds) {
5527 		const struct got_error *pack_err =
5528 		    got_repo_pack_fds_close(pack_fds);
5529 		if (error == NULL)
5530 			error = pack_err;
5531 	}
5532 	tog_free_refs();
5533 	return error;
5534 }
5535 
5536 __dead static void
5537 usage_blame(void)
5538 {
5539 	endwin();
5540 	fprintf(stderr,
5541 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5542 	    getprogname());
5543 	exit(1);
5544 }
5545 
5546 struct tog_blame_line {
5547 	int annotated;
5548 	struct got_object_id *id;
5549 };
5550 
5551 static const struct got_error *
5552 draw_blame(struct tog_view *view)
5553 {
5554 	struct tog_blame_view_state *s = &view->state.blame;
5555 	struct tog_blame *blame = &s->blame;
5556 	regmatch_t *regmatch = &view->regmatch;
5557 	const struct got_error *err;
5558 	int lineno = 0, nprinted = 0;
5559 	char *line = NULL;
5560 	size_t linesize = 0;
5561 	ssize_t linelen;
5562 	wchar_t *wline;
5563 	int width;
5564 	struct tog_blame_line *blame_line;
5565 	struct got_object_id *prev_id = NULL;
5566 	char *id_str;
5567 	struct tog_color *tc;
5568 
5569 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5570 	if (err)
5571 		return err;
5572 
5573 	rewind(blame->f);
5574 	werase(view->window);
5575 
5576 	if (asprintf(&line, "commit %s", id_str) == -1) {
5577 		err = got_error_from_errno("asprintf");
5578 		free(id_str);
5579 		return err;
5580 	}
5581 
5582 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5583 	free(line);
5584 	line = NULL;
5585 	if (err)
5586 		return err;
5587 	if (view_needs_focus_indication(view))
5588 		wstandout(view->window);
5589 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5590 	if (tc)
5591 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5592 	waddwstr(view->window, wline);
5593 	while (width++ < view->ncols)
5594 		waddch(view->window, ' ');
5595 	if (tc)
5596 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5597 	if (view_needs_focus_indication(view))
5598 		wstandend(view->window);
5599 	free(wline);
5600 	wline = NULL;
5601 
5602 	if (view->gline > blame->nlines)
5603 		view->gline = blame->nlines;
5604 
5605 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5606 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5607 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5608 		free(id_str);
5609 		return got_error_from_errno("asprintf");
5610 	}
5611 	free(id_str);
5612 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5613 	free(line);
5614 	line = NULL;
5615 	if (err)
5616 		return err;
5617 	waddwstr(view->window, wline);
5618 	free(wline);
5619 	wline = NULL;
5620 	if (width < view->ncols - 1)
5621 		waddch(view->window, '\n');
5622 
5623 	s->eof = 0;
5624 	view->maxx = 0;
5625 	while (nprinted < view->nlines - 2) {
5626 		linelen = getline(&line, &linesize, blame->f);
5627 		if (linelen == -1) {
5628 			if (feof(blame->f)) {
5629 				s->eof = 1;
5630 				break;
5631 			}
5632 			free(line);
5633 			return got_ferror(blame->f, GOT_ERR_IO);
5634 		}
5635 		if (++lineno < s->first_displayed_line)
5636 			continue;
5637 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5638 			continue;
5639 
5640 		/* Set view->maxx based on full line length. */
5641 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5642 		if (err) {
5643 			free(line);
5644 			return err;
5645 		}
5646 		free(wline);
5647 		wline = NULL;
5648 		view->maxx = MAX(view->maxx, width);
5649 
5650 		if (nprinted == s->selected_line - 1)
5651 			wstandout(view->window);
5652 
5653 		if (blame->nlines > 0) {
5654 			blame_line = &blame->lines[lineno - 1];
5655 			if (blame_line->annotated && prev_id &&
5656 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5657 			    !(nprinted == s->selected_line - 1)) {
5658 				waddstr(view->window, "        ");
5659 			} else if (blame_line->annotated) {
5660 				char *id_str;
5661 				err = got_object_id_str(&id_str,
5662 				    blame_line->id);
5663 				if (err) {
5664 					free(line);
5665 					return err;
5666 				}
5667 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5668 				if (tc)
5669 					wattr_on(view->window,
5670 					    COLOR_PAIR(tc->colorpair), NULL);
5671 				wprintw(view->window, "%.8s", id_str);
5672 				if (tc)
5673 					wattr_off(view->window,
5674 					    COLOR_PAIR(tc->colorpair), NULL);
5675 				free(id_str);
5676 				prev_id = blame_line->id;
5677 			} else {
5678 				waddstr(view->window, "........");
5679 				prev_id = NULL;
5680 			}
5681 		} else {
5682 			waddstr(view->window, "........");
5683 			prev_id = NULL;
5684 		}
5685 
5686 		if (nprinted == s->selected_line - 1)
5687 			wstandend(view->window);
5688 		waddstr(view->window, " ");
5689 
5690 		if (view->ncols <= 9) {
5691 			width = 9;
5692 		} else if (s->first_displayed_line + nprinted ==
5693 		    s->matched_line &&
5694 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5695 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5696 			    view->window, view->x, regmatch);
5697 			if (err) {
5698 				free(line);
5699 				return err;
5700 			}
5701 			width += 9;
5702 		} else {
5703 			int skip;
5704 			err = format_line(&wline, &width, &skip, line,
5705 			    view->x, view->ncols - 9, 9, 1);
5706 			if (err) {
5707 				free(line);
5708 				return err;
5709 			}
5710 			waddwstr(view->window, &wline[skip]);
5711 			width += 9;
5712 			free(wline);
5713 			wline = NULL;
5714 		}
5715 
5716 		if (width <= view->ncols - 1)
5717 			waddch(view->window, '\n');
5718 		if (++nprinted == 1)
5719 			s->first_displayed_line = lineno;
5720 	}
5721 	free(line);
5722 	s->last_displayed_line = lineno;
5723 
5724 	view_border(view);
5725 
5726 	return NULL;
5727 }
5728 
5729 static const struct got_error *
5730 blame_cb(void *arg, int nlines, int lineno,
5731     struct got_commit_object *commit, struct got_object_id *id)
5732 {
5733 	const struct got_error *err = NULL;
5734 	struct tog_blame_cb_args *a = arg;
5735 	struct tog_blame_line *line;
5736 	int errcode;
5737 
5738 	if (nlines != a->nlines ||
5739 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5740 		return got_error(GOT_ERR_RANGE);
5741 
5742 	errcode = pthread_mutex_lock(&tog_mutex);
5743 	if (errcode)
5744 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5745 
5746 	if (*a->quit) {	/* user has quit the blame view */
5747 		err = got_error(GOT_ERR_ITER_COMPLETED);
5748 		goto done;
5749 	}
5750 
5751 	if (lineno == -1)
5752 		goto done; /* no change in this commit */
5753 
5754 	line = &a->lines[lineno - 1];
5755 	if (line->annotated)
5756 		goto done;
5757 
5758 	line->id = got_object_id_dup(id);
5759 	if (line->id == NULL) {
5760 		err = got_error_from_errno("got_object_id_dup");
5761 		goto done;
5762 	}
5763 	line->annotated = 1;
5764 done:
5765 	errcode = pthread_mutex_unlock(&tog_mutex);
5766 	if (errcode)
5767 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5768 	return err;
5769 }
5770 
5771 static void *
5772 blame_thread(void *arg)
5773 {
5774 	const struct got_error *err, *close_err;
5775 	struct tog_blame_thread_args *ta = arg;
5776 	struct tog_blame_cb_args *a = ta->cb_args;
5777 	int errcode, fd1 = -1, fd2 = -1;
5778 	FILE *f1 = NULL, *f2 = NULL;
5779 
5780 	fd1 = got_opentempfd();
5781 	if (fd1 == -1)
5782 		return (void *)got_error_from_errno("got_opentempfd");
5783 
5784 	fd2 = got_opentempfd();
5785 	if (fd2 == -1) {
5786 		err = got_error_from_errno("got_opentempfd");
5787 		goto done;
5788 	}
5789 
5790 	f1 = got_opentemp();
5791 	if (f1 == NULL) {
5792 		err = (void *)got_error_from_errno("got_opentemp");
5793 		goto done;
5794 	}
5795 	f2 = got_opentemp();
5796 	if (f2 == NULL) {
5797 		err = (void *)got_error_from_errno("got_opentemp");
5798 		goto done;
5799 	}
5800 
5801 	err = block_signals_used_by_main_thread();
5802 	if (err)
5803 		goto done;
5804 
5805 	err = got_blame(ta->path, a->commit_id, ta->repo,
5806 	    tog_diff_algo, blame_cb, ta->cb_args,
5807 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5808 	if (err && err->code == GOT_ERR_CANCELLED)
5809 		err = NULL;
5810 
5811 	errcode = pthread_mutex_lock(&tog_mutex);
5812 	if (errcode) {
5813 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5814 		goto done;
5815 	}
5816 
5817 	close_err = got_repo_close(ta->repo);
5818 	if (err == NULL)
5819 		err = close_err;
5820 	ta->repo = NULL;
5821 	*ta->complete = 1;
5822 
5823 	errcode = pthread_mutex_unlock(&tog_mutex);
5824 	if (errcode && err == NULL)
5825 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5826 
5827 done:
5828 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5829 		err = got_error_from_errno("close");
5830 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5831 		err = got_error_from_errno("close");
5832 	if (f1 && fclose(f1) == EOF && err == NULL)
5833 		err = got_error_from_errno("fclose");
5834 	if (f2 && fclose(f2) == EOF && err == NULL)
5835 		err = got_error_from_errno("fclose");
5836 
5837 	return (void *)err;
5838 }
5839 
5840 static struct got_object_id *
5841 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5842     int first_displayed_line, int selected_line)
5843 {
5844 	struct tog_blame_line *line;
5845 
5846 	if (nlines <= 0)
5847 		return NULL;
5848 
5849 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5850 	if (!line->annotated)
5851 		return NULL;
5852 
5853 	return line->id;
5854 }
5855 
5856 static struct got_object_id *
5857 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5858     int lineno)
5859 {
5860 	struct tog_blame_line *line;
5861 
5862 	if (nlines <= 0 || lineno >= nlines)
5863 		return NULL;
5864 
5865 	line = &lines[lineno - 1];
5866 	if (!line->annotated)
5867 		return NULL;
5868 
5869 	return line->id;
5870 }
5871 
5872 static const struct got_error *
5873 stop_blame(struct tog_blame *blame)
5874 {
5875 	const struct got_error *err = NULL;
5876 	int i;
5877 
5878 	if (blame->thread) {
5879 		int errcode;
5880 		errcode = pthread_mutex_unlock(&tog_mutex);
5881 		if (errcode)
5882 			return got_error_set_errno(errcode,
5883 			    "pthread_mutex_unlock");
5884 		errcode = pthread_join(blame->thread, (void **)&err);
5885 		if (errcode)
5886 			return got_error_set_errno(errcode, "pthread_join");
5887 		errcode = pthread_mutex_lock(&tog_mutex);
5888 		if (errcode)
5889 			return got_error_set_errno(errcode,
5890 			    "pthread_mutex_lock");
5891 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5892 			err = NULL;
5893 		blame->thread = 0; //NULL;
5894 	}
5895 	if (blame->thread_args.repo) {
5896 		const struct got_error *close_err;
5897 		close_err = got_repo_close(blame->thread_args.repo);
5898 		if (err == NULL)
5899 			err = close_err;
5900 		blame->thread_args.repo = NULL;
5901 	}
5902 	if (blame->f) {
5903 		if (fclose(blame->f) == EOF && err == NULL)
5904 			err = got_error_from_errno("fclose");
5905 		blame->f = NULL;
5906 	}
5907 	if (blame->lines) {
5908 		for (i = 0; i < blame->nlines; i++)
5909 			free(blame->lines[i].id);
5910 		free(blame->lines);
5911 		blame->lines = NULL;
5912 	}
5913 	free(blame->cb_args.commit_id);
5914 	blame->cb_args.commit_id = NULL;
5915 	if (blame->pack_fds) {
5916 		const struct got_error *pack_err =
5917 		    got_repo_pack_fds_close(blame->pack_fds);
5918 		if (err == NULL)
5919 			err = pack_err;
5920 		blame->pack_fds = NULL;
5921 	}
5922 	return err;
5923 }
5924 
5925 static const struct got_error *
5926 cancel_blame_view(void *arg)
5927 {
5928 	const struct got_error *err = NULL;
5929 	int *done = arg;
5930 	int errcode;
5931 
5932 	errcode = pthread_mutex_lock(&tog_mutex);
5933 	if (errcode)
5934 		return got_error_set_errno(errcode,
5935 		    "pthread_mutex_unlock");
5936 
5937 	if (*done)
5938 		err = got_error(GOT_ERR_CANCELLED);
5939 
5940 	errcode = pthread_mutex_unlock(&tog_mutex);
5941 	if (errcode)
5942 		return got_error_set_errno(errcode,
5943 		    "pthread_mutex_lock");
5944 
5945 	return err;
5946 }
5947 
5948 static const struct got_error *
5949 run_blame(struct tog_view *view)
5950 {
5951 	struct tog_blame_view_state *s = &view->state.blame;
5952 	struct tog_blame *blame = &s->blame;
5953 	const struct got_error *err = NULL;
5954 	struct got_commit_object *commit = NULL;
5955 	struct got_blob_object *blob = NULL;
5956 	struct got_repository *thread_repo = NULL;
5957 	struct got_object_id *obj_id = NULL;
5958 	int obj_type, fd = -1;
5959 	int *pack_fds = NULL;
5960 
5961 	err = got_object_open_as_commit(&commit, s->repo,
5962 	    &s->blamed_commit->id);
5963 	if (err)
5964 		return err;
5965 
5966 	fd = got_opentempfd();
5967 	if (fd == -1) {
5968 		err = got_error_from_errno("got_opentempfd");
5969 		goto done;
5970 	}
5971 
5972 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5973 	if (err)
5974 		goto done;
5975 
5976 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5977 	if (err)
5978 		goto done;
5979 
5980 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5981 		err = got_error(GOT_ERR_OBJ_TYPE);
5982 		goto done;
5983 	}
5984 
5985 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5986 	if (err)
5987 		goto done;
5988 	blame->f = got_opentemp();
5989 	if (blame->f == NULL) {
5990 		err = got_error_from_errno("got_opentemp");
5991 		goto done;
5992 	}
5993 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5994 	    &blame->line_offsets, blame->f, blob);
5995 	if (err)
5996 		goto done;
5997 	if (blame->nlines == 0) {
5998 		s->blame_complete = 1;
5999 		goto done;
6000 	}
6001 
6002 	/* Don't include \n at EOF in the blame line count. */
6003 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6004 		blame->nlines--;
6005 
6006 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6007 	if (blame->lines == NULL) {
6008 		err = got_error_from_errno("calloc");
6009 		goto done;
6010 	}
6011 
6012 	err = got_repo_pack_fds_open(&pack_fds);
6013 	if (err)
6014 		goto done;
6015 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6016 	    pack_fds);
6017 	if (err)
6018 		goto done;
6019 
6020 	blame->pack_fds = pack_fds;
6021 	blame->cb_args.view = view;
6022 	blame->cb_args.lines = blame->lines;
6023 	blame->cb_args.nlines = blame->nlines;
6024 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6025 	if (blame->cb_args.commit_id == NULL) {
6026 		err = got_error_from_errno("got_object_id_dup");
6027 		goto done;
6028 	}
6029 	blame->cb_args.quit = &s->done;
6030 
6031 	blame->thread_args.path = s->path;
6032 	blame->thread_args.repo = thread_repo;
6033 	blame->thread_args.cb_args = &blame->cb_args;
6034 	blame->thread_args.complete = &s->blame_complete;
6035 	blame->thread_args.cancel_cb = cancel_blame_view;
6036 	blame->thread_args.cancel_arg = &s->done;
6037 	s->blame_complete = 0;
6038 
6039 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6040 		s->first_displayed_line = 1;
6041 		s->last_displayed_line = view->nlines;
6042 		s->selected_line = 1;
6043 	}
6044 	s->matched_line = 0;
6045 
6046 done:
6047 	if (commit)
6048 		got_object_commit_close(commit);
6049 	if (fd != -1 && close(fd) == -1 && err == NULL)
6050 		err = got_error_from_errno("close");
6051 	if (blob)
6052 		got_object_blob_close(blob);
6053 	free(obj_id);
6054 	if (err)
6055 		stop_blame(blame);
6056 	return err;
6057 }
6058 
6059 static const struct got_error *
6060 open_blame_view(struct tog_view *view, char *path,
6061     struct got_object_id *commit_id, struct got_repository *repo)
6062 {
6063 	const struct got_error *err = NULL;
6064 	struct tog_blame_view_state *s = &view->state.blame;
6065 
6066 	STAILQ_INIT(&s->blamed_commits);
6067 
6068 	s->path = strdup(path);
6069 	if (s->path == NULL)
6070 		return got_error_from_errno("strdup");
6071 
6072 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6073 	if (err) {
6074 		free(s->path);
6075 		return err;
6076 	}
6077 
6078 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6079 	s->first_displayed_line = 1;
6080 	s->last_displayed_line = view->nlines;
6081 	s->selected_line = 1;
6082 	s->blame_complete = 0;
6083 	s->repo = repo;
6084 	s->commit_id = commit_id;
6085 	memset(&s->blame, 0, sizeof(s->blame));
6086 
6087 	STAILQ_INIT(&s->colors);
6088 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6089 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6090 		    get_color_value("TOG_COLOR_COMMIT"));
6091 		if (err)
6092 			return err;
6093 	}
6094 
6095 	view->show = show_blame_view;
6096 	view->input = input_blame_view;
6097 	view->reset = reset_blame_view;
6098 	view->close = close_blame_view;
6099 	view->search_start = search_start_blame_view;
6100 	view->search_setup = search_setup_blame_view;
6101 	view->search_next = search_next_view_match;
6102 
6103 	return run_blame(view);
6104 }
6105 
6106 static const struct got_error *
6107 close_blame_view(struct tog_view *view)
6108 {
6109 	const struct got_error *err = NULL;
6110 	struct tog_blame_view_state *s = &view->state.blame;
6111 
6112 	if (s->blame.thread)
6113 		err = stop_blame(&s->blame);
6114 
6115 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6116 		struct got_object_qid *blamed_commit;
6117 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6118 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6119 		got_object_qid_free(blamed_commit);
6120 	}
6121 
6122 	free(s->path);
6123 	free_colors(&s->colors);
6124 	return err;
6125 }
6126 
6127 static const struct got_error *
6128 search_start_blame_view(struct tog_view *view)
6129 {
6130 	struct tog_blame_view_state *s = &view->state.blame;
6131 
6132 	s->matched_line = 0;
6133 	return NULL;
6134 }
6135 
6136 static void
6137 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6138     size_t *nlines, int **first, int **last, int **match, int **selected)
6139 {
6140 	struct tog_blame_view_state *s = &view->state.blame;
6141 
6142 	*f = s->blame.f;
6143 	*nlines = s->blame.nlines;
6144 	*line_offsets = s->blame.line_offsets;
6145 	*match = &s->matched_line;
6146 	*first = &s->first_displayed_line;
6147 	*last = &s->last_displayed_line;
6148 	*selected = &s->selected_line;
6149 }
6150 
6151 static const struct got_error *
6152 show_blame_view(struct tog_view *view)
6153 {
6154 	const struct got_error *err = NULL;
6155 	struct tog_blame_view_state *s = &view->state.blame;
6156 	int errcode;
6157 
6158 	if (s->blame.thread == 0 && !s->blame_complete) {
6159 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6160 		    &s->blame.thread_args);
6161 		if (errcode)
6162 			return got_error_set_errno(errcode, "pthread_create");
6163 
6164 		halfdelay(1); /* fast refresh while annotating  */
6165 	}
6166 
6167 	if (s->blame_complete)
6168 		halfdelay(10); /* disable fast refresh */
6169 
6170 	err = draw_blame(view);
6171 
6172 	view_border(view);
6173 	return err;
6174 }
6175 
6176 static const struct got_error *
6177 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6178     struct got_repository *repo, struct got_object_id *id)
6179 {
6180 	struct tog_view		*log_view;
6181 	const struct got_error	*err = NULL;
6182 
6183 	*new_view = NULL;
6184 
6185 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6186 	if (log_view == NULL)
6187 		return got_error_from_errno("view_open");
6188 
6189 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6190 	if (err)
6191 		view_close(log_view);
6192 	else
6193 		*new_view = log_view;
6194 
6195 	return err;
6196 }
6197 
6198 static const struct got_error *
6199 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6200 {
6201 	const struct got_error *err = NULL, *thread_err = NULL;
6202 	struct tog_view *diff_view;
6203 	struct tog_blame_view_state *s = &view->state.blame;
6204 	int eos, nscroll, begin_y = 0, begin_x = 0;
6205 
6206 	eos = nscroll = view->nlines - 2;
6207 	if (view_is_hsplit_top(view))
6208 		--eos;  /* border */
6209 
6210 	switch (ch) {
6211 	case '0':
6212 		view->x = 0;
6213 		break;
6214 	case '$':
6215 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6216 		view->count = 0;
6217 		break;
6218 	case KEY_RIGHT:
6219 	case 'l':
6220 		if (view->x + view->ncols / 3 < view->maxx)
6221 			view->x += 2;  /* move two columns right */
6222 		else
6223 			view->count = 0;
6224 		break;
6225 	case KEY_LEFT:
6226 	case 'h':
6227 		view->x -= MIN(view->x, 2);  /* move two columns back */
6228 		if (view->x <= 0)
6229 			view->count = 0;
6230 		break;
6231 	case 'q':
6232 		s->done = 1;
6233 		break;
6234 	case 'g':
6235 	case KEY_HOME:
6236 		s->selected_line = 1;
6237 		s->first_displayed_line = 1;
6238 		view->count = 0;
6239 		break;
6240 	case 'G':
6241 	case KEY_END:
6242 		if (s->blame.nlines < eos) {
6243 			s->selected_line = s->blame.nlines;
6244 			s->first_displayed_line = 1;
6245 		} else {
6246 			s->selected_line = eos;
6247 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6248 		}
6249 		view->count = 0;
6250 		break;
6251 	case 'k':
6252 	case KEY_UP:
6253 	case CTRL('p'):
6254 		if (s->selected_line > 1)
6255 			s->selected_line--;
6256 		else if (s->selected_line == 1 &&
6257 		    s->first_displayed_line > 1)
6258 			s->first_displayed_line--;
6259 		else
6260 			view->count = 0;
6261 		break;
6262 	case CTRL('u'):
6263 	case 'u':
6264 		nscroll /= 2;
6265 		/* FALL THROUGH */
6266 	case KEY_PPAGE:
6267 	case CTRL('b'):
6268 	case 'b':
6269 		if (s->first_displayed_line == 1) {
6270 			if (view->count > 1)
6271 				nscroll += nscroll;
6272 			s->selected_line = MAX(1, s->selected_line - nscroll);
6273 			view->count = 0;
6274 			break;
6275 		}
6276 		if (s->first_displayed_line > nscroll)
6277 			s->first_displayed_line -= nscroll;
6278 		else
6279 			s->first_displayed_line = 1;
6280 		break;
6281 	case 'j':
6282 	case KEY_DOWN:
6283 	case CTRL('n'):
6284 		if (s->selected_line < eos && s->first_displayed_line +
6285 		    s->selected_line <= s->blame.nlines)
6286 			s->selected_line++;
6287 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6288 			s->first_displayed_line++;
6289 		else
6290 			view->count = 0;
6291 		break;
6292 	case 'c':
6293 	case 'p': {
6294 		struct got_object_id *id = NULL;
6295 
6296 		view->count = 0;
6297 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6298 		    s->first_displayed_line, s->selected_line);
6299 		if (id == NULL)
6300 			break;
6301 		if (ch == 'p') {
6302 			struct got_commit_object *commit, *pcommit;
6303 			struct got_object_qid *pid;
6304 			struct got_object_id *blob_id = NULL;
6305 			int obj_type;
6306 			err = got_object_open_as_commit(&commit,
6307 			    s->repo, id);
6308 			if (err)
6309 				break;
6310 			pid = STAILQ_FIRST(
6311 			    got_object_commit_get_parent_ids(commit));
6312 			if (pid == NULL) {
6313 				got_object_commit_close(commit);
6314 				break;
6315 			}
6316 			/* Check if path history ends here. */
6317 			err = got_object_open_as_commit(&pcommit,
6318 			    s->repo, &pid->id);
6319 			if (err)
6320 				break;
6321 			err = got_object_id_by_path(&blob_id, s->repo,
6322 			    pcommit, s->path);
6323 			got_object_commit_close(pcommit);
6324 			if (err) {
6325 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6326 					err = NULL;
6327 				got_object_commit_close(commit);
6328 				break;
6329 			}
6330 			err = got_object_get_type(&obj_type, s->repo,
6331 			    blob_id);
6332 			free(blob_id);
6333 			/* Can't blame non-blob type objects. */
6334 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6335 				got_object_commit_close(commit);
6336 				break;
6337 			}
6338 			err = got_object_qid_alloc(&s->blamed_commit,
6339 			    &pid->id);
6340 			got_object_commit_close(commit);
6341 		} else {
6342 			if (got_object_id_cmp(id,
6343 			    &s->blamed_commit->id) == 0)
6344 				break;
6345 			err = got_object_qid_alloc(&s->blamed_commit,
6346 			    id);
6347 		}
6348 		if (err)
6349 			break;
6350 		s->done = 1;
6351 		thread_err = stop_blame(&s->blame);
6352 		s->done = 0;
6353 		if (thread_err)
6354 			break;
6355 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6356 		    s->blamed_commit, entry);
6357 		err = run_blame(view);
6358 		if (err)
6359 			break;
6360 		break;
6361 	}
6362 	case 'C': {
6363 		struct got_object_qid *first;
6364 
6365 		view->count = 0;
6366 		first = STAILQ_FIRST(&s->blamed_commits);
6367 		if (!got_object_id_cmp(&first->id, s->commit_id))
6368 			break;
6369 		s->done = 1;
6370 		thread_err = stop_blame(&s->blame);
6371 		s->done = 0;
6372 		if (thread_err)
6373 			break;
6374 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6375 		got_object_qid_free(s->blamed_commit);
6376 		s->blamed_commit =
6377 		    STAILQ_FIRST(&s->blamed_commits);
6378 		err = run_blame(view);
6379 		if (err)
6380 			break;
6381 		break;
6382 	}
6383 	case 'L':
6384 		view->count = 0;
6385 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6386 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6387 		if (s->id_to_log)
6388 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6389 		break;
6390 	case KEY_ENTER:
6391 	case '\r': {
6392 		struct got_object_id *id = NULL;
6393 		struct got_object_qid *pid;
6394 		struct got_commit_object *commit = NULL;
6395 
6396 		view->count = 0;
6397 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6398 		    s->first_displayed_line, s->selected_line);
6399 		if (id == NULL)
6400 			break;
6401 		err = got_object_open_as_commit(&commit, s->repo, id);
6402 		if (err)
6403 			break;
6404 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6405 		if (*new_view) {
6406 			/* traversed from diff view, release diff resources  */
6407 			err = close_diff_view(*new_view);
6408 			if (err)
6409 				break;
6410 			diff_view = *new_view;
6411 		} else {
6412 			if (view_is_parent_view(view))
6413 				view_get_split(view, &begin_y, &begin_x);
6414 
6415 			diff_view = view_open(0, 0, begin_y, begin_x,
6416 			    TOG_VIEW_DIFF);
6417 			if (diff_view == NULL) {
6418 				got_object_commit_close(commit);
6419 				err = got_error_from_errno("view_open");
6420 				break;
6421 			}
6422 		}
6423 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6424 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6425 		got_object_commit_close(commit);
6426 		if (err) {
6427 			view_close(diff_view);
6428 			break;
6429 		}
6430 		s->last_diffed_line = s->first_displayed_line - 1 +
6431 		    s->selected_line;
6432 		if (*new_view)
6433 			break;	/* still open from active diff view */
6434 		if (view_is_parent_view(view) &&
6435 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6436 			err = view_init_hsplit(view, begin_y);
6437 			if (err)
6438 				break;
6439 		}
6440 
6441 		view->focussed = 0;
6442 		diff_view->focussed = 1;
6443 		diff_view->mode = view->mode;
6444 		diff_view->nlines = view->lines - begin_y;
6445 		if (view_is_parent_view(view)) {
6446 			view_transfer_size(diff_view, view);
6447 			err = view_close_child(view);
6448 			if (err)
6449 				break;
6450 			err = view_set_child(view, diff_view);
6451 			if (err)
6452 				break;
6453 			view->focus_child = 1;
6454 		} else
6455 			*new_view = diff_view;
6456 		if (err)
6457 			break;
6458 		break;
6459 	}
6460 	case CTRL('d'):
6461 	case 'd':
6462 		nscroll /= 2;
6463 		/* FALL THROUGH */
6464 	case KEY_NPAGE:
6465 	case CTRL('f'):
6466 	case 'f':
6467 	case ' ':
6468 		if (s->last_displayed_line >= s->blame.nlines &&
6469 		    s->selected_line >= MIN(s->blame.nlines,
6470 		    view->nlines - 2)) {
6471 			view->count = 0;
6472 			break;
6473 		}
6474 		if (s->last_displayed_line >= s->blame.nlines &&
6475 		    s->selected_line < view->nlines - 2) {
6476 			s->selected_line +=
6477 			    MIN(nscroll, s->last_displayed_line -
6478 			    s->first_displayed_line - s->selected_line + 1);
6479 		}
6480 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6481 			s->first_displayed_line += nscroll;
6482 		else
6483 			s->first_displayed_line =
6484 			    s->blame.nlines - (view->nlines - 3);
6485 		break;
6486 	case KEY_RESIZE:
6487 		if (s->selected_line > view->nlines - 2) {
6488 			s->selected_line = MIN(s->blame.nlines,
6489 			    view->nlines - 2);
6490 		}
6491 		break;
6492 	default:
6493 		view->count = 0;
6494 		break;
6495 	}
6496 	return thread_err ? thread_err : err;
6497 }
6498 
6499 static const struct got_error *
6500 reset_blame_view(struct tog_view *view)
6501 {
6502 	const struct got_error *err;
6503 	struct tog_blame_view_state *s = &view->state.blame;
6504 
6505 	view->count = 0;
6506 	s->done = 1;
6507 	err = stop_blame(&s->blame);
6508 	s->done = 0;
6509 	if (err)
6510 		return err;
6511 	return run_blame(view);
6512 }
6513 
6514 static const struct got_error *
6515 cmd_blame(int argc, char *argv[])
6516 {
6517 	const struct got_error *error;
6518 	struct got_repository *repo = NULL;
6519 	struct got_worktree *worktree = NULL;
6520 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6521 	char *link_target = NULL;
6522 	struct got_object_id *commit_id = NULL;
6523 	struct got_commit_object *commit = NULL;
6524 	char *commit_id_str = NULL;
6525 	int ch;
6526 	struct tog_view *view;
6527 	int *pack_fds = NULL;
6528 
6529 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6530 		switch (ch) {
6531 		case 'c':
6532 			commit_id_str = optarg;
6533 			break;
6534 		case 'r':
6535 			repo_path = realpath(optarg, NULL);
6536 			if (repo_path == NULL)
6537 				return got_error_from_errno2("realpath",
6538 				    optarg);
6539 			break;
6540 		default:
6541 			usage_blame();
6542 			/* NOTREACHED */
6543 		}
6544 	}
6545 
6546 	argc -= optind;
6547 	argv += optind;
6548 
6549 	if (argc != 1)
6550 		usage_blame();
6551 
6552 	error = got_repo_pack_fds_open(&pack_fds);
6553 	if (error != NULL)
6554 		goto done;
6555 
6556 	if (repo_path == NULL) {
6557 		cwd = getcwd(NULL, 0);
6558 		if (cwd == NULL)
6559 			return got_error_from_errno("getcwd");
6560 		error = got_worktree_open(&worktree, cwd);
6561 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6562 			goto done;
6563 		if (worktree)
6564 			repo_path =
6565 			    strdup(got_worktree_get_repo_path(worktree));
6566 		else
6567 			repo_path = strdup(cwd);
6568 		if (repo_path == NULL) {
6569 			error = got_error_from_errno("strdup");
6570 			goto done;
6571 		}
6572 	}
6573 
6574 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6575 	if (error != NULL)
6576 		goto done;
6577 
6578 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6579 	    worktree);
6580 	if (error)
6581 		goto done;
6582 
6583 	init_curses();
6584 
6585 	error = apply_unveil(got_repo_get_path(repo), NULL);
6586 	if (error)
6587 		goto done;
6588 
6589 	error = tog_load_refs(repo, 0);
6590 	if (error)
6591 		goto done;
6592 
6593 	if (commit_id_str == NULL) {
6594 		struct got_reference *head_ref;
6595 		error = got_ref_open(&head_ref, repo, worktree ?
6596 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6597 		if (error != NULL)
6598 			goto done;
6599 		error = got_ref_resolve(&commit_id, repo, head_ref);
6600 		got_ref_close(head_ref);
6601 	} else {
6602 		error = got_repo_match_object_id(&commit_id, NULL,
6603 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6604 	}
6605 	if (error != NULL)
6606 		goto done;
6607 
6608 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6609 	if (view == NULL) {
6610 		error = got_error_from_errno("view_open");
6611 		goto done;
6612 	}
6613 
6614 	error = got_object_open_as_commit(&commit, repo, commit_id);
6615 	if (error)
6616 		goto done;
6617 
6618 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6619 	    commit, repo);
6620 	if (error)
6621 		goto done;
6622 
6623 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6624 	    commit_id, repo);
6625 	if (error)
6626 		goto done;
6627 	if (worktree) {
6628 		/* Release work tree lock. */
6629 		got_worktree_close(worktree);
6630 		worktree = NULL;
6631 	}
6632 	error = view_loop(view);
6633 done:
6634 	free(repo_path);
6635 	free(in_repo_path);
6636 	free(link_target);
6637 	free(cwd);
6638 	free(commit_id);
6639 	if (commit)
6640 		got_object_commit_close(commit);
6641 	if (worktree)
6642 		got_worktree_close(worktree);
6643 	if (repo) {
6644 		const struct got_error *close_err = got_repo_close(repo);
6645 		if (error == NULL)
6646 			error = close_err;
6647 	}
6648 	if (pack_fds) {
6649 		const struct got_error *pack_err =
6650 		    got_repo_pack_fds_close(pack_fds);
6651 		if (error == NULL)
6652 			error = pack_err;
6653 	}
6654 	tog_free_refs();
6655 	return error;
6656 }
6657 
6658 static const struct got_error *
6659 draw_tree_entries(struct tog_view *view, const char *parent_path)
6660 {
6661 	struct tog_tree_view_state *s = &view->state.tree;
6662 	const struct got_error *err = NULL;
6663 	struct got_tree_entry *te;
6664 	wchar_t *wline;
6665 	char *index = NULL;
6666 	struct tog_color *tc;
6667 	int width, n, nentries, i = 1;
6668 	int limit = view->nlines;
6669 
6670 	s->ndisplayed = 0;
6671 	if (view_is_hsplit_top(view))
6672 		--limit;  /* border */
6673 
6674 	werase(view->window);
6675 
6676 	if (limit == 0)
6677 		return NULL;
6678 
6679 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6680 	    0, 0);
6681 	if (err)
6682 		return err;
6683 	if (view_needs_focus_indication(view))
6684 		wstandout(view->window);
6685 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6686 	if (tc)
6687 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6688 	waddwstr(view->window, wline);
6689 	free(wline);
6690 	wline = NULL;
6691 	while (width++ < view->ncols)
6692 		waddch(view->window, ' ');
6693 	if (tc)
6694 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6695 	if (view_needs_focus_indication(view))
6696 		wstandend(view->window);
6697 	if (--limit <= 0)
6698 		return NULL;
6699 
6700 	i += s->selected;
6701 	if (s->first_displayed_entry) {
6702 		i += got_tree_entry_get_index(s->first_displayed_entry);
6703 		if (s->tree != s->root)
6704 			++i;  /* account for ".." entry */
6705 	}
6706 	nentries = got_object_tree_get_nentries(s->tree);
6707 	if (asprintf(&index, "[%d/%d] %s",
6708 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6709 		return got_error_from_errno("asprintf");
6710 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6711 	free(index);
6712 	if (err)
6713 		return err;
6714 	waddwstr(view->window, wline);
6715 	free(wline);
6716 	wline = NULL;
6717 	if (width < view->ncols - 1)
6718 		waddch(view->window, '\n');
6719 	if (--limit <= 0)
6720 		return NULL;
6721 	waddch(view->window, '\n');
6722 	if (--limit <= 0)
6723 		return NULL;
6724 
6725 	if (s->first_displayed_entry == NULL) {
6726 		te = got_object_tree_get_first_entry(s->tree);
6727 		if (s->selected == 0) {
6728 			if (view->focussed)
6729 				wstandout(view->window);
6730 			s->selected_entry = NULL;
6731 		}
6732 		waddstr(view->window, "  ..\n");	/* parent directory */
6733 		if (s->selected == 0 && view->focussed)
6734 			wstandend(view->window);
6735 		s->ndisplayed++;
6736 		if (--limit <= 0)
6737 			return NULL;
6738 		n = 1;
6739 	} else {
6740 		n = 0;
6741 		te = s->first_displayed_entry;
6742 	}
6743 
6744 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6745 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6746 		const char *modestr = "";
6747 		mode_t mode;
6748 
6749 		te = got_object_tree_get_entry(s->tree, i);
6750 		mode = got_tree_entry_get_mode(te);
6751 
6752 		if (s->show_ids) {
6753 			err = got_object_id_str(&id_str,
6754 			    got_tree_entry_get_id(te));
6755 			if (err)
6756 				return got_error_from_errno(
6757 				    "got_object_id_str");
6758 		}
6759 		if (got_object_tree_entry_is_submodule(te))
6760 			modestr = "$";
6761 		else if (S_ISLNK(mode)) {
6762 			int i;
6763 
6764 			err = got_tree_entry_get_symlink_target(&link_target,
6765 			    te, s->repo);
6766 			if (err) {
6767 				free(id_str);
6768 				return err;
6769 			}
6770 			for (i = 0; i < strlen(link_target); i++) {
6771 				if (!isprint((unsigned char)link_target[i]))
6772 					link_target[i] = '?';
6773 			}
6774 			modestr = "@";
6775 		}
6776 		else if (S_ISDIR(mode))
6777 			modestr = "/";
6778 		else if (mode & S_IXUSR)
6779 			modestr = "*";
6780 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6781 		    got_tree_entry_get_name(te), modestr,
6782 		    link_target ? " -> ": "",
6783 		    link_target ? link_target : "") == -1) {
6784 			free(id_str);
6785 			free(link_target);
6786 			return got_error_from_errno("asprintf");
6787 		}
6788 		free(id_str);
6789 		free(link_target);
6790 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6791 		    0, 0);
6792 		if (err) {
6793 			free(line);
6794 			break;
6795 		}
6796 		if (n == s->selected) {
6797 			if (view->focussed)
6798 				wstandout(view->window);
6799 			s->selected_entry = te;
6800 		}
6801 		tc = match_color(&s->colors, line);
6802 		if (tc)
6803 			wattr_on(view->window,
6804 			    COLOR_PAIR(tc->colorpair), NULL);
6805 		waddwstr(view->window, wline);
6806 		if (tc)
6807 			wattr_off(view->window,
6808 			    COLOR_PAIR(tc->colorpair), NULL);
6809 		if (width < view->ncols - 1)
6810 			waddch(view->window, '\n');
6811 		if (n == s->selected && view->focussed)
6812 			wstandend(view->window);
6813 		free(line);
6814 		free(wline);
6815 		wline = NULL;
6816 		n++;
6817 		s->ndisplayed++;
6818 		s->last_displayed_entry = te;
6819 		if (--limit <= 0)
6820 			break;
6821 	}
6822 
6823 	return err;
6824 }
6825 
6826 static void
6827 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6828 {
6829 	struct got_tree_entry *te;
6830 	int isroot = s->tree == s->root;
6831 	int i = 0;
6832 
6833 	if (s->first_displayed_entry == NULL)
6834 		return;
6835 
6836 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6837 	while (i++ < maxscroll) {
6838 		if (te == NULL) {
6839 			if (!isroot)
6840 				s->first_displayed_entry = NULL;
6841 			break;
6842 		}
6843 		s->first_displayed_entry = te;
6844 		te = got_tree_entry_get_prev(s->tree, te);
6845 	}
6846 }
6847 
6848 static const struct got_error *
6849 tree_scroll_down(struct tog_view *view, int maxscroll)
6850 {
6851 	struct tog_tree_view_state *s = &view->state.tree;
6852 	struct got_tree_entry *next, *last;
6853 	int n = 0;
6854 
6855 	if (s->first_displayed_entry)
6856 		next = got_tree_entry_get_next(s->tree,
6857 		    s->first_displayed_entry);
6858 	else
6859 		next = got_object_tree_get_first_entry(s->tree);
6860 
6861 	last = s->last_displayed_entry;
6862 	while (next && n++ < maxscroll) {
6863 		if (last) {
6864 			s->last_displayed_entry = last;
6865 			last = got_tree_entry_get_next(s->tree, last);
6866 		}
6867 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6868 			s->first_displayed_entry = next;
6869 			next = got_tree_entry_get_next(s->tree, next);
6870 		}
6871 	}
6872 
6873 	return NULL;
6874 }
6875 
6876 static const struct got_error *
6877 tree_entry_path(char **path, struct tog_parent_trees *parents,
6878     struct got_tree_entry *te)
6879 {
6880 	const struct got_error *err = NULL;
6881 	struct tog_parent_tree *pt;
6882 	size_t len = 2; /* for leading slash and NUL */
6883 
6884 	TAILQ_FOREACH(pt, parents, entry)
6885 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6886 		    + 1 /* slash */;
6887 	if (te)
6888 		len += strlen(got_tree_entry_get_name(te));
6889 
6890 	*path = calloc(1, len);
6891 	if (path == NULL)
6892 		return got_error_from_errno("calloc");
6893 
6894 	(*path)[0] = '/';
6895 	pt = TAILQ_LAST(parents, tog_parent_trees);
6896 	while (pt) {
6897 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6898 		if (strlcat(*path, name, len) >= len) {
6899 			err = got_error(GOT_ERR_NO_SPACE);
6900 			goto done;
6901 		}
6902 		if (strlcat(*path, "/", len) >= len) {
6903 			err = got_error(GOT_ERR_NO_SPACE);
6904 			goto done;
6905 		}
6906 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6907 	}
6908 	if (te) {
6909 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6910 			err = got_error(GOT_ERR_NO_SPACE);
6911 			goto done;
6912 		}
6913 	}
6914 done:
6915 	if (err) {
6916 		free(*path);
6917 		*path = NULL;
6918 	}
6919 	return err;
6920 }
6921 
6922 static const struct got_error *
6923 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6924     struct got_tree_entry *te, struct tog_parent_trees *parents,
6925     struct got_object_id *commit_id, struct got_repository *repo)
6926 {
6927 	const struct got_error *err = NULL;
6928 	char *path;
6929 	struct tog_view *blame_view;
6930 
6931 	*new_view = NULL;
6932 
6933 	err = tree_entry_path(&path, parents, te);
6934 	if (err)
6935 		return err;
6936 
6937 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6938 	if (blame_view == NULL) {
6939 		err = got_error_from_errno("view_open");
6940 		goto done;
6941 	}
6942 
6943 	err = open_blame_view(blame_view, path, commit_id, repo);
6944 	if (err) {
6945 		if (err->code == GOT_ERR_CANCELLED)
6946 			err = NULL;
6947 		view_close(blame_view);
6948 	} else
6949 		*new_view = blame_view;
6950 done:
6951 	free(path);
6952 	return err;
6953 }
6954 
6955 static const struct got_error *
6956 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6957     struct tog_tree_view_state *s)
6958 {
6959 	struct tog_view *log_view;
6960 	const struct got_error *err = NULL;
6961 	char *path;
6962 
6963 	*new_view = NULL;
6964 
6965 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6966 	if (log_view == NULL)
6967 		return got_error_from_errno("view_open");
6968 
6969 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6970 	if (err)
6971 		return err;
6972 
6973 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6974 	    path, 0);
6975 	if (err)
6976 		view_close(log_view);
6977 	else
6978 		*new_view = log_view;
6979 	free(path);
6980 	return err;
6981 }
6982 
6983 static const struct got_error *
6984 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6985     const char *head_ref_name, struct got_repository *repo)
6986 {
6987 	const struct got_error *err = NULL;
6988 	char *commit_id_str = NULL;
6989 	struct tog_tree_view_state *s = &view->state.tree;
6990 	struct got_commit_object *commit = NULL;
6991 
6992 	TAILQ_INIT(&s->parents);
6993 	STAILQ_INIT(&s->colors);
6994 
6995 	s->commit_id = got_object_id_dup(commit_id);
6996 	if (s->commit_id == NULL)
6997 		return got_error_from_errno("got_object_id_dup");
6998 
6999 	err = got_object_open_as_commit(&commit, repo, commit_id);
7000 	if (err)
7001 		goto done;
7002 
7003 	/*
7004 	 * The root is opened here and will be closed when the view is closed.
7005 	 * Any visited subtrees and their path-wise parents are opened and
7006 	 * closed on demand.
7007 	 */
7008 	err = got_object_open_as_tree(&s->root, repo,
7009 	    got_object_commit_get_tree_id(commit));
7010 	if (err)
7011 		goto done;
7012 	s->tree = s->root;
7013 
7014 	err = got_object_id_str(&commit_id_str, commit_id);
7015 	if (err != NULL)
7016 		goto done;
7017 
7018 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7019 		err = got_error_from_errno("asprintf");
7020 		goto done;
7021 	}
7022 
7023 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7024 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7025 	if (head_ref_name) {
7026 		s->head_ref_name = strdup(head_ref_name);
7027 		if (s->head_ref_name == NULL) {
7028 			err = got_error_from_errno("strdup");
7029 			goto done;
7030 		}
7031 	}
7032 	s->repo = repo;
7033 
7034 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7035 		err = add_color(&s->colors, "\\$$",
7036 		    TOG_COLOR_TREE_SUBMODULE,
7037 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7038 		if (err)
7039 			goto done;
7040 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7041 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7042 		if (err)
7043 			goto done;
7044 		err = add_color(&s->colors, "/$",
7045 		    TOG_COLOR_TREE_DIRECTORY,
7046 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7047 		if (err)
7048 			goto done;
7049 
7050 		err = add_color(&s->colors, "\\*$",
7051 		    TOG_COLOR_TREE_EXECUTABLE,
7052 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7053 		if (err)
7054 			goto done;
7055 
7056 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7057 		    get_color_value("TOG_COLOR_COMMIT"));
7058 		if (err)
7059 			goto done;
7060 	}
7061 
7062 	view->show = show_tree_view;
7063 	view->input = input_tree_view;
7064 	view->close = close_tree_view;
7065 	view->search_start = search_start_tree_view;
7066 	view->search_next = search_next_tree_view;
7067 done:
7068 	free(commit_id_str);
7069 	if (commit)
7070 		got_object_commit_close(commit);
7071 	if (err)
7072 		close_tree_view(view);
7073 	return err;
7074 }
7075 
7076 static const struct got_error *
7077 close_tree_view(struct tog_view *view)
7078 {
7079 	struct tog_tree_view_state *s = &view->state.tree;
7080 
7081 	free_colors(&s->colors);
7082 	free(s->tree_label);
7083 	s->tree_label = NULL;
7084 	free(s->commit_id);
7085 	s->commit_id = NULL;
7086 	free(s->head_ref_name);
7087 	s->head_ref_name = NULL;
7088 	while (!TAILQ_EMPTY(&s->parents)) {
7089 		struct tog_parent_tree *parent;
7090 		parent = TAILQ_FIRST(&s->parents);
7091 		TAILQ_REMOVE(&s->parents, parent, entry);
7092 		if (parent->tree != s->root)
7093 			got_object_tree_close(parent->tree);
7094 		free(parent);
7095 
7096 	}
7097 	if (s->tree != NULL && s->tree != s->root)
7098 		got_object_tree_close(s->tree);
7099 	if (s->root)
7100 		got_object_tree_close(s->root);
7101 	return NULL;
7102 }
7103 
7104 static const struct got_error *
7105 search_start_tree_view(struct tog_view *view)
7106 {
7107 	struct tog_tree_view_state *s = &view->state.tree;
7108 
7109 	s->matched_entry = NULL;
7110 	return NULL;
7111 }
7112 
7113 static int
7114 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7115 {
7116 	regmatch_t regmatch;
7117 
7118 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7119 	    0) == 0;
7120 }
7121 
7122 static const struct got_error *
7123 search_next_tree_view(struct tog_view *view)
7124 {
7125 	struct tog_tree_view_state *s = &view->state.tree;
7126 	struct got_tree_entry *te = NULL;
7127 
7128 	if (!view->searching) {
7129 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7130 		return NULL;
7131 	}
7132 
7133 	if (s->matched_entry) {
7134 		if (view->searching == TOG_SEARCH_FORWARD) {
7135 			if (s->selected_entry)
7136 				te = got_tree_entry_get_next(s->tree,
7137 				    s->selected_entry);
7138 			else
7139 				te = got_object_tree_get_first_entry(s->tree);
7140 		} else {
7141 			if (s->selected_entry == NULL)
7142 				te = got_object_tree_get_last_entry(s->tree);
7143 			else
7144 				te = got_tree_entry_get_prev(s->tree,
7145 				    s->selected_entry);
7146 		}
7147 	} else {
7148 		if (s->selected_entry)
7149 			te = s->selected_entry;
7150 		else if (view->searching == TOG_SEARCH_FORWARD)
7151 			te = got_object_tree_get_first_entry(s->tree);
7152 		else
7153 			te = got_object_tree_get_last_entry(s->tree);
7154 	}
7155 
7156 	while (1) {
7157 		if (te == NULL) {
7158 			if (s->matched_entry == NULL) {
7159 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7160 				return NULL;
7161 			}
7162 			if (view->searching == TOG_SEARCH_FORWARD)
7163 				te = got_object_tree_get_first_entry(s->tree);
7164 			else
7165 				te = got_object_tree_get_last_entry(s->tree);
7166 		}
7167 
7168 		if (match_tree_entry(te, &view->regex)) {
7169 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7170 			s->matched_entry = te;
7171 			break;
7172 		}
7173 
7174 		if (view->searching == TOG_SEARCH_FORWARD)
7175 			te = got_tree_entry_get_next(s->tree, te);
7176 		else
7177 			te = got_tree_entry_get_prev(s->tree, te);
7178 	}
7179 
7180 	if (s->matched_entry) {
7181 		s->first_displayed_entry = s->matched_entry;
7182 		s->selected = 0;
7183 	}
7184 
7185 	return NULL;
7186 }
7187 
7188 static const struct got_error *
7189 show_tree_view(struct tog_view *view)
7190 {
7191 	const struct got_error *err = NULL;
7192 	struct tog_tree_view_state *s = &view->state.tree;
7193 	char *parent_path;
7194 
7195 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7196 	if (err)
7197 		return err;
7198 
7199 	err = draw_tree_entries(view, parent_path);
7200 	free(parent_path);
7201 
7202 	view_border(view);
7203 	return err;
7204 }
7205 
7206 static const struct got_error *
7207 tree_goto_line(struct tog_view *view, int nlines)
7208 {
7209 	const struct got_error		 *err = NULL;
7210 	struct tog_tree_view_state	 *s = &view->state.tree;
7211 	struct got_tree_entry		**fte, **lte, **ste;
7212 	int				  g, last, first = 1, i = 1;
7213 	int				  root = s->tree == s->root;
7214 	int				  off = root ? 1 : 2;
7215 
7216 	g = view->gline;
7217 	view->gline = 0;
7218 
7219 	if (g == 0)
7220 		g = 1;
7221 	else if (g > got_object_tree_get_nentries(s->tree))
7222 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7223 
7224 	fte = &s->first_displayed_entry;
7225 	lte = &s->last_displayed_entry;
7226 	ste = &s->selected_entry;
7227 
7228 	if (*fte != NULL) {
7229 		first = got_tree_entry_get_index(*fte);
7230 		first += off;  /* account for ".." */
7231 	}
7232 	last = got_tree_entry_get_index(*lte);
7233 	last += off;
7234 
7235 	if (g >= first && g <= last && g - first < nlines) {
7236 		s->selected = g - first;
7237 		return NULL;	/* gline is on the current page */
7238 	}
7239 
7240 	if (*ste != NULL) {
7241 		i = got_tree_entry_get_index(*ste);
7242 		i += off;
7243 	}
7244 
7245 	if (i < g) {
7246 		err = tree_scroll_down(view, g - i);
7247 		if (err)
7248 			return err;
7249 		if (got_tree_entry_get_index(*lte) >=
7250 		    got_object_tree_get_nentries(s->tree) - 1 &&
7251 		    first + s->selected < g &&
7252 		    s->selected < s->ndisplayed - 1) {
7253 			first = got_tree_entry_get_index(*fte);
7254 			first += off;
7255 			s->selected = g - first;
7256 		}
7257 	} else if (i > g)
7258 		tree_scroll_up(s, i - g);
7259 
7260 	if (g < nlines &&
7261 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7262 		s->selected = g - 1;
7263 
7264 	return NULL;
7265 }
7266 
7267 static const struct got_error *
7268 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7269 {
7270 	const struct got_error *err = NULL;
7271 	struct tog_tree_view_state *s = &view->state.tree;
7272 	struct got_tree_entry *te;
7273 	int n, nscroll = view->nlines - 3;
7274 
7275 	if (view->gline)
7276 		return tree_goto_line(view, nscroll);
7277 
7278 	switch (ch) {
7279 	case 'i':
7280 		s->show_ids = !s->show_ids;
7281 		view->count = 0;
7282 		break;
7283 	case 'L':
7284 		view->count = 0;
7285 		if (!s->selected_entry)
7286 			break;
7287 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7288 		break;
7289 	case 'R':
7290 		view->count = 0;
7291 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7292 		break;
7293 	case 'g':
7294 	case KEY_HOME:
7295 		s->selected = 0;
7296 		view->count = 0;
7297 		if (s->tree == s->root)
7298 			s->first_displayed_entry =
7299 			    got_object_tree_get_first_entry(s->tree);
7300 		else
7301 			s->first_displayed_entry = NULL;
7302 		break;
7303 	case 'G':
7304 	case KEY_END: {
7305 		int eos = view->nlines - 3;
7306 
7307 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7308 			--eos;  /* border */
7309 		s->selected = 0;
7310 		view->count = 0;
7311 		te = got_object_tree_get_last_entry(s->tree);
7312 		for (n = 0; n < eos; n++) {
7313 			if (te == NULL) {
7314 				if (s->tree != s->root) {
7315 					s->first_displayed_entry = NULL;
7316 					n++;
7317 				}
7318 				break;
7319 			}
7320 			s->first_displayed_entry = te;
7321 			te = got_tree_entry_get_prev(s->tree, te);
7322 		}
7323 		if (n > 0)
7324 			s->selected = n - 1;
7325 		break;
7326 	}
7327 	case 'k':
7328 	case KEY_UP:
7329 	case CTRL('p'):
7330 		if (s->selected > 0) {
7331 			s->selected--;
7332 			break;
7333 		}
7334 		tree_scroll_up(s, 1);
7335 		if (s->selected_entry == NULL ||
7336 		    (s->tree == s->root && s->selected_entry ==
7337 		     got_object_tree_get_first_entry(s->tree)))
7338 			view->count = 0;
7339 		break;
7340 	case CTRL('u'):
7341 	case 'u':
7342 		nscroll /= 2;
7343 		/* FALL THROUGH */
7344 	case KEY_PPAGE:
7345 	case CTRL('b'):
7346 	case 'b':
7347 		if (s->tree == s->root) {
7348 			if (got_object_tree_get_first_entry(s->tree) ==
7349 			    s->first_displayed_entry)
7350 				s->selected -= MIN(s->selected, nscroll);
7351 		} else {
7352 			if (s->first_displayed_entry == NULL)
7353 				s->selected -= MIN(s->selected, nscroll);
7354 		}
7355 		tree_scroll_up(s, MAX(0, nscroll));
7356 		if (s->selected_entry == NULL ||
7357 		    (s->tree == s->root && s->selected_entry ==
7358 		     got_object_tree_get_first_entry(s->tree)))
7359 			view->count = 0;
7360 		break;
7361 	case 'j':
7362 	case KEY_DOWN:
7363 	case CTRL('n'):
7364 		if (s->selected < s->ndisplayed - 1) {
7365 			s->selected++;
7366 			break;
7367 		}
7368 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7369 		    == NULL) {
7370 			/* can't scroll any further */
7371 			view->count = 0;
7372 			break;
7373 		}
7374 		tree_scroll_down(view, 1);
7375 		break;
7376 	case CTRL('d'):
7377 	case 'd':
7378 		nscroll /= 2;
7379 		/* FALL THROUGH */
7380 	case KEY_NPAGE:
7381 	case CTRL('f'):
7382 	case 'f':
7383 	case ' ':
7384 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7385 		    == NULL) {
7386 			/* can't scroll any further; move cursor down */
7387 			if (s->selected < s->ndisplayed - 1)
7388 				s->selected += MIN(nscroll,
7389 				    s->ndisplayed - s->selected - 1);
7390 			else
7391 				view->count = 0;
7392 			break;
7393 		}
7394 		tree_scroll_down(view, nscroll);
7395 		break;
7396 	case KEY_ENTER:
7397 	case '\r':
7398 	case KEY_BACKSPACE:
7399 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7400 			struct tog_parent_tree *parent;
7401 			/* user selected '..' */
7402 			if (s->tree == s->root) {
7403 				view->count = 0;
7404 				break;
7405 			}
7406 			parent = TAILQ_FIRST(&s->parents);
7407 			TAILQ_REMOVE(&s->parents, parent,
7408 			    entry);
7409 			got_object_tree_close(s->tree);
7410 			s->tree = parent->tree;
7411 			s->first_displayed_entry =
7412 			    parent->first_displayed_entry;
7413 			s->selected_entry =
7414 			    parent->selected_entry;
7415 			s->selected = parent->selected;
7416 			if (s->selected > view->nlines - 3) {
7417 				err = offset_selection_down(view);
7418 				if (err)
7419 					break;
7420 			}
7421 			free(parent);
7422 		} else if (S_ISDIR(got_tree_entry_get_mode(
7423 		    s->selected_entry))) {
7424 			struct got_tree_object *subtree;
7425 			view->count = 0;
7426 			err = got_object_open_as_tree(&subtree, s->repo,
7427 			    got_tree_entry_get_id(s->selected_entry));
7428 			if (err)
7429 				break;
7430 			err = tree_view_visit_subtree(s, subtree);
7431 			if (err) {
7432 				got_object_tree_close(subtree);
7433 				break;
7434 			}
7435 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7436 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7437 		break;
7438 	case KEY_RESIZE:
7439 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7440 			s->selected = view->nlines - 4;
7441 		view->count = 0;
7442 		break;
7443 	default:
7444 		view->count = 0;
7445 		break;
7446 	}
7447 
7448 	return err;
7449 }
7450 
7451 __dead static void
7452 usage_tree(void)
7453 {
7454 	endwin();
7455 	fprintf(stderr,
7456 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7457 	    getprogname());
7458 	exit(1);
7459 }
7460 
7461 static const struct got_error *
7462 cmd_tree(int argc, char *argv[])
7463 {
7464 	const struct got_error *error;
7465 	struct got_repository *repo = NULL;
7466 	struct got_worktree *worktree = NULL;
7467 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7468 	struct got_object_id *commit_id = NULL;
7469 	struct got_commit_object *commit = NULL;
7470 	const char *commit_id_arg = NULL;
7471 	char *label = NULL;
7472 	struct got_reference *ref = NULL;
7473 	const char *head_ref_name = NULL;
7474 	int ch;
7475 	struct tog_view *view;
7476 	int *pack_fds = NULL;
7477 
7478 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7479 		switch (ch) {
7480 		case 'c':
7481 			commit_id_arg = optarg;
7482 			break;
7483 		case 'r':
7484 			repo_path = realpath(optarg, NULL);
7485 			if (repo_path == NULL)
7486 				return got_error_from_errno2("realpath",
7487 				    optarg);
7488 			break;
7489 		default:
7490 			usage_tree();
7491 			/* NOTREACHED */
7492 		}
7493 	}
7494 
7495 	argc -= optind;
7496 	argv += optind;
7497 
7498 	if (argc > 1)
7499 		usage_tree();
7500 
7501 	error = got_repo_pack_fds_open(&pack_fds);
7502 	if (error != NULL)
7503 		goto done;
7504 
7505 	if (repo_path == NULL) {
7506 		cwd = getcwd(NULL, 0);
7507 		if (cwd == NULL)
7508 			return got_error_from_errno("getcwd");
7509 		error = got_worktree_open(&worktree, cwd);
7510 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7511 			goto done;
7512 		if (worktree)
7513 			repo_path =
7514 			    strdup(got_worktree_get_repo_path(worktree));
7515 		else
7516 			repo_path = strdup(cwd);
7517 		if (repo_path == NULL) {
7518 			error = got_error_from_errno("strdup");
7519 			goto done;
7520 		}
7521 	}
7522 
7523 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7524 	if (error != NULL)
7525 		goto done;
7526 
7527 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7528 	    repo, worktree);
7529 	if (error)
7530 		goto done;
7531 
7532 	init_curses();
7533 
7534 	error = apply_unveil(got_repo_get_path(repo), NULL);
7535 	if (error)
7536 		goto done;
7537 
7538 	error = tog_load_refs(repo, 0);
7539 	if (error)
7540 		goto done;
7541 
7542 	if (commit_id_arg == NULL) {
7543 		error = got_repo_match_object_id(&commit_id, &label,
7544 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7545 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7546 		if (error)
7547 			goto done;
7548 		head_ref_name = label;
7549 	} else {
7550 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7551 		if (error == NULL)
7552 			head_ref_name = got_ref_get_name(ref);
7553 		else if (error->code != GOT_ERR_NOT_REF)
7554 			goto done;
7555 		error = got_repo_match_object_id(&commit_id, NULL,
7556 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7557 		if (error)
7558 			goto done;
7559 	}
7560 
7561 	error = got_object_open_as_commit(&commit, repo, commit_id);
7562 	if (error)
7563 		goto done;
7564 
7565 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7566 	if (view == NULL) {
7567 		error = got_error_from_errno("view_open");
7568 		goto done;
7569 	}
7570 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7571 	if (error)
7572 		goto done;
7573 	if (!got_path_is_root_dir(in_repo_path)) {
7574 		error = tree_view_walk_path(&view->state.tree, commit,
7575 		    in_repo_path);
7576 		if (error)
7577 			goto done;
7578 	}
7579 
7580 	if (worktree) {
7581 		/* Release work tree lock. */
7582 		got_worktree_close(worktree);
7583 		worktree = NULL;
7584 	}
7585 	error = view_loop(view);
7586 done:
7587 	free(repo_path);
7588 	free(cwd);
7589 	free(commit_id);
7590 	free(label);
7591 	if (ref)
7592 		got_ref_close(ref);
7593 	if (repo) {
7594 		const struct got_error *close_err = got_repo_close(repo);
7595 		if (error == NULL)
7596 			error = close_err;
7597 	}
7598 	if (pack_fds) {
7599 		const struct got_error *pack_err =
7600 		    got_repo_pack_fds_close(pack_fds);
7601 		if (error == NULL)
7602 			error = pack_err;
7603 	}
7604 	tog_free_refs();
7605 	return error;
7606 }
7607 
7608 static const struct got_error *
7609 ref_view_load_refs(struct tog_ref_view_state *s)
7610 {
7611 	struct got_reflist_entry *sre;
7612 	struct tog_reflist_entry *re;
7613 
7614 	s->nrefs = 0;
7615 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7616 		if (strncmp(got_ref_get_name(sre->ref),
7617 		    "refs/got/", 9) == 0 &&
7618 		    strncmp(got_ref_get_name(sre->ref),
7619 		    "refs/got/backup/", 16) != 0)
7620 			continue;
7621 
7622 		re = malloc(sizeof(*re));
7623 		if (re == NULL)
7624 			return got_error_from_errno("malloc");
7625 
7626 		re->ref = got_ref_dup(sre->ref);
7627 		if (re->ref == NULL)
7628 			return got_error_from_errno("got_ref_dup");
7629 		re->idx = s->nrefs++;
7630 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7631 	}
7632 
7633 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7634 	return NULL;
7635 }
7636 
7637 static void
7638 ref_view_free_refs(struct tog_ref_view_state *s)
7639 {
7640 	struct tog_reflist_entry *re;
7641 
7642 	while (!TAILQ_EMPTY(&s->refs)) {
7643 		re = TAILQ_FIRST(&s->refs);
7644 		TAILQ_REMOVE(&s->refs, re, entry);
7645 		got_ref_close(re->ref);
7646 		free(re);
7647 	}
7648 }
7649 
7650 static const struct got_error *
7651 open_ref_view(struct tog_view *view, struct got_repository *repo)
7652 {
7653 	const struct got_error *err = NULL;
7654 	struct tog_ref_view_state *s = &view->state.ref;
7655 
7656 	s->selected_entry = 0;
7657 	s->repo = repo;
7658 
7659 	TAILQ_INIT(&s->refs);
7660 	STAILQ_INIT(&s->colors);
7661 
7662 	err = ref_view_load_refs(s);
7663 	if (err)
7664 		return err;
7665 
7666 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7667 		err = add_color(&s->colors, "^refs/heads/",
7668 		    TOG_COLOR_REFS_HEADS,
7669 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7670 		if (err)
7671 			goto done;
7672 
7673 		err = add_color(&s->colors, "^refs/tags/",
7674 		    TOG_COLOR_REFS_TAGS,
7675 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7676 		if (err)
7677 			goto done;
7678 
7679 		err = add_color(&s->colors, "^refs/remotes/",
7680 		    TOG_COLOR_REFS_REMOTES,
7681 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7682 		if (err)
7683 			goto done;
7684 
7685 		err = add_color(&s->colors, "^refs/got/backup/",
7686 		    TOG_COLOR_REFS_BACKUP,
7687 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7688 		if (err)
7689 			goto done;
7690 	}
7691 
7692 	view->show = show_ref_view;
7693 	view->input = input_ref_view;
7694 	view->close = close_ref_view;
7695 	view->search_start = search_start_ref_view;
7696 	view->search_next = search_next_ref_view;
7697 done:
7698 	if (err)
7699 		free_colors(&s->colors);
7700 	return err;
7701 }
7702 
7703 static const struct got_error *
7704 close_ref_view(struct tog_view *view)
7705 {
7706 	struct tog_ref_view_state *s = &view->state.ref;
7707 
7708 	ref_view_free_refs(s);
7709 	free_colors(&s->colors);
7710 
7711 	return NULL;
7712 }
7713 
7714 static const struct got_error *
7715 resolve_reflist_entry(struct got_object_id **commit_id,
7716     struct tog_reflist_entry *re, struct got_repository *repo)
7717 {
7718 	const struct got_error *err = NULL;
7719 	struct got_object_id *obj_id;
7720 	struct got_tag_object *tag = NULL;
7721 	int obj_type;
7722 
7723 	*commit_id = NULL;
7724 
7725 	err = got_ref_resolve(&obj_id, repo, re->ref);
7726 	if (err)
7727 		return err;
7728 
7729 	err = got_object_get_type(&obj_type, repo, obj_id);
7730 	if (err)
7731 		goto done;
7732 
7733 	switch (obj_type) {
7734 	case GOT_OBJ_TYPE_COMMIT:
7735 		*commit_id = obj_id;
7736 		break;
7737 	case GOT_OBJ_TYPE_TAG:
7738 		err = got_object_open_as_tag(&tag, repo, obj_id);
7739 		if (err)
7740 			goto done;
7741 		free(obj_id);
7742 		err = got_object_get_type(&obj_type, repo,
7743 		    got_object_tag_get_object_id(tag));
7744 		if (err)
7745 			goto done;
7746 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7747 			err = got_error(GOT_ERR_OBJ_TYPE);
7748 			goto done;
7749 		}
7750 		*commit_id = got_object_id_dup(
7751 		    got_object_tag_get_object_id(tag));
7752 		if (*commit_id == NULL) {
7753 			err = got_error_from_errno("got_object_id_dup");
7754 			goto done;
7755 		}
7756 		break;
7757 	default:
7758 		err = got_error(GOT_ERR_OBJ_TYPE);
7759 		break;
7760 	}
7761 
7762 done:
7763 	if (tag)
7764 		got_object_tag_close(tag);
7765 	if (err) {
7766 		free(*commit_id);
7767 		*commit_id = NULL;
7768 	}
7769 	return err;
7770 }
7771 
7772 static const struct got_error *
7773 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7774     struct tog_reflist_entry *re, struct got_repository *repo)
7775 {
7776 	struct tog_view *log_view;
7777 	const struct got_error *err = NULL;
7778 	struct got_object_id *commit_id = NULL;
7779 
7780 	*new_view = NULL;
7781 
7782 	err = resolve_reflist_entry(&commit_id, re, repo);
7783 	if (err) {
7784 		if (err->code != GOT_ERR_OBJ_TYPE)
7785 			return err;
7786 		else
7787 			return NULL;
7788 	}
7789 
7790 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7791 	if (log_view == NULL) {
7792 		err = got_error_from_errno("view_open");
7793 		goto done;
7794 	}
7795 
7796 	err = open_log_view(log_view, commit_id, repo,
7797 	    got_ref_get_name(re->ref), "", 0);
7798 done:
7799 	if (err)
7800 		view_close(log_view);
7801 	else
7802 		*new_view = log_view;
7803 	free(commit_id);
7804 	return err;
7805 }
7806 
7807 static void
7808 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7809 {
7810 	struct tog_reflist_entry *re;
7811 	int i = 0;
7812 
7813 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7814 		return;
7815 
7816 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7817 	while (i++ < maxscroll) {
7818 		if (re == NULL)
7819 			break;
7820 		s->first_displayed_entry = re;
7821 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7822 	}
7823 }
7824 
7825 static const struct got_error *
7826 ref_scroll_down(struct tog_view *view, int maxscroll)
7827 {
7828 	struct tog_ref_view_state *s = &view->state.ref;
7829 	struct tog_reflist_entry *next, *last;
7830 	int n = 0;
7831 
7832 	if (s->first_displayed_entry)
7833 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7834 	else
7835 		next = TAILQ_FIRST(&s->refs);
7836 
7837 	last = s->last_displayed_entry;
7838 	while (next && n++ < maxscroll) {
7839 		if (last) {
7840 			s->last_displayed_entry = last;
7841 			last = TAILQ_NEXT(last, entry);
7842 		}
7843 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7844 			s->first_displayed_entry = next;
7845 			next = TAILQ_NEXT(next, entry);
7846 		}
7847 	}
7848 
7849 	return NULL;
7850 }
7851 
7852 static const struct got_error *
7853 search_start_ref_view(struct tog_view *view)
7854 {
7855 	struct tog_ref_view_state *s = &view->state.ref;
7856 
7857 	s->matched_entry = NULL;
7858 	return NULL;
7859 }
7860 
7861 static int
7862 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7863 {
7864 	regmatch_t regmatch;
7865 
7866 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7867 	    0) == 0;
7868 }
7869 
7870 static const struct got_error *
7871 search_next_ref_view(struct tog_view *view)
7872 {
7873 	struct tog_ref_view_state *s = &view->state.ref;
7874 	struct tog_reflist_entry *re = NULL;
7875 
7876 	if (!view->searching) {
7877 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7878 		return NULL;
7879 	}
7880 
7881 	if (s->matched_entry) {
7882 		if (view->searching == TOG_SEARCH_FORWARD) {
7883 			if (s->selected_entry)
7884 				re = TAILQ_NEXT(s->selected_entry, entry);
7885 			else
7886 				re = TAILQ_PREV(s->selected_entry,
7887 				    tog_reflist_head, entry);
7888 		} else {
7889 			if (s->selected_entry == NULL)
7890 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7891 			else
7892 				re = TAILQ_PREV(s->selected_entry,
7893 				    tog_reflist_head, entry);
7894 		}
7895 	} else {
7896 		if (s->selected_entry)
7897 			re = s->selected_entry;
7898 		else if (view->searching == TOG_SEARCH_FORWARD)
7899 			re = TAILQ_FIRST(&s->refs);
7900 		else
7901 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7902 	}
7903 
7904 	while (1) {
7905 		if (re == NULL) {
7906 			if (s->matched_entry == NULL) {
7907 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7908 				return NULL;
7909 			}
7910 			if (view->searching == TOG_SEARCH_FORWARD)
7911 				re = TAILQ_FIRST(&s->refs);
7912 			else
7913 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7914 		}
7915 
7916 		if (match_reflist_entry(re, &view->regex)) {
7917 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7918 			s->matched_entry = re;
7919 			break;
7920 		}
7921 
7922 		if (view->searching == TOG_SEARCH_FORWARD)
7923 			re = TAILQ_NEXT(re, entry);
7924 		else
7925 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7926 	}
7927 
7928 	if (s->matched_entry) {
7929 		s->first_displayed_entry = s->matched_entry;
7930 		s->selected = 0;
7931 	}
7932 
7933 	return NULL;
7934 }
7935 
7936 static const struct got_error *
7937 show_ref_view(struct tog_view *view)
7938 {
7939 	const struct got_error *err = NULL;
7940 	struct tog_ref_view_state *s = &view->state.ref;
7941 	struct tog_reflist_entry *re;
7942 	char *line = NULL;
7943 	wchar_t *wline;
7944 	struct tog_color *tc;
7945 	int width, n;
7946 	int limit = view->nlines;
7947 
7948 	werase(view->window);
7949 
7950 	s->ndisplayed = 0;
7951 	if (view_is_hsplit_top(view))
7952 		--limit;  /* border */
7953 
7954 	if (limit == 0)
7955 		return NULL;
7956 
7957 	re = s->first_displayed_entry;
7958 
7959 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7960 	    s->nrefs) == -1)
7961 		return got_error_from_errno("asprintf");
7962 
7963 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7964 	if (err) {
7965 		free(line);
7966 		return err;
7967 	}
7968 	if (view_needs_focus_indication(view))
7969 		wstandout(view->window);
7970 	waddwstr(view->window, wline);
7971 	while (width++ < view->ncols)
7972 		waddch(view->window, ' ');
7973 	if (view_needs_focus_indication(view))
7974 		wstandend(view->window);
7975 	free(wline);
7976 	wline = NULL;
7977 	free(line);
7978 	line = NULL;
7979 	if (--limit <= 0)
7980 		return NULL;
7981 
7982 	n = 0;
7983 	while (re && limit > 0) {
7984 		char *line = NULL;
7985 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7986 
7987 		if (s->show_date) {
7988 			struct got_commit_object *ci;
7989 			struct got_tag_object *tag;
7990 			struct got_object_id *id;
7991 			struct tm tm;
7992 			time_t t;
7993 
7994 			err = got_ref_resolve(&id, s->repo, re->ref);
7995 			if (err)
7996 				return err;
7997 			err = got_object_open_as_tag(&tag, s->repo, id);
7998 			if (err) {
7999 				if (err->code != GOT_ERR_OBJ_TYPE) {
8000 					free(id);
8001 					return err;
8002 				}
8003 				err = got_object_open_as_commit(&ci, s->repo,
8004 				    id);
8005 				if (err) {
8006 					free(id);
8007 					return err;
8008 				}
8009 				t = got_object_commit_get_committer_time(ci);
8010 				got_object_commit_close(ci);
8011 			} else {
8012 				t = got_object_tag_get_tagger_time(tag);
8013 				got_object_tag_close(tag);
8014 			}
8015 			free(id);
8016 			if (gmtime_r(&t, &tm) == NULL)
8017 				return got_error_from_errno("gmtime_r");
8018 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8019 				return got_error(GOT_ERR_NO_SPACE);
8020 		}
8021 		if (got_ref_is_symbolic(re->ref)) {
8022 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8023 			    ymd : "", got_ref_get_name(re->ref),
8024 			    got_ref_get_symref_target(re->ref)) == -1)
8025 				return got_error_from_errno("asprintf");
8026 		} else if (s->show_ids) {
8027 			struct got_object_id *id;
8028 			char *id_str;
8029 			err = got_ref_resolve(&id, s->repo, re->ref);
8030 			if (err)
8031 				return err;
8032 			err = got_object_id_str(&id_str, id);
8033 			if (err) {
8034 				free(id);
8035 				return err;
8036 			}
8037 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8038 			    got_ref_get_name(re->ref), id_str) == -1) {
8039 				err = got_error_from_errno("asprintf");
8040 				free(id);
8041 				free(id_str);
8042 				return err;
8043 			}
8044 			free(id);
8045 			free(id_str);
8046 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8047 		    got_ref_get_name(re->ref)) == -1)
8048 			return got_error_from_errno("asprintf");
8049 
8050 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8051 		    0, 0);
8052 		if (err) {
8053 			free(line);
8054 			return err;
8055 		}
8056 		if (n == s->selected) {
8057 			if (view->focussed)
8058 				wstandout(view->window);
8059 			s->selected_entry = re;
8060 		}
8061 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8062 		if (tc)
8063 			wattr_on(view->window,
8064 			    COLOR_PAIR(tc->colorpair), NULL);
8065 		waddwstr(view->window, wline);
8066 		if (tc)
8067 			wattr_off(view->window,
8068 			    COLOR_PAIR(tc->colorpair), NULL);
8069 		if (width < view->ncols - 1)
8070 			waddch(view->window, '\n');
8071 		if (n == s->selected && view->focussed)
8072 			wstandend(view->window);
8073 		free(line);
8074 		free(wline);
8075 		wline = NULL;
8076 		n++;
8077 		s->ndisplayed++;
8078 		s->last_displayed_entry = re;
8079 
8080 		limit--;
8081 		re = TAILQ_NEXT(re, entry);
8082 	}
8083 
8084 	view_border(view);
8085 	return err;
8086 }
8087 
8088 static const struct got_error *
8089 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8090     struct tog_reflist_entry *re, struct got_repository *repo)
8091 {
8092 	const struct got_error *err = NULL;
8093 	struct got_object_id *commit_id = NULL;
8094 	struct tog_view *tree_view;
8095 
8096 	*new_view = NULL;
8097 
8098 	err = resolve_reflist_entry(&commit_id, re, repo);
8099 	if (err) {
8100 		if (err->code != GOT_ERR_OBJ_TYPE)
8101 			return err;
8102 		else
8103 			return NULL;
8104 	}
8105 
8106 
8107 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8108 	if (tree_view == NULL) {
8109 		err = got_error_from_errno("view_open");
8110 		goto done;
8111 	}
8112 
8113 	err = open_tree_view(tree_view, commit_id,
8114 	    got_ref_get_name(re->ref), repo);
8115 	if (err)
8116 		goto done;
8117 
8118 	*new_view = tree_view;
8119 done:
8120 	free(commit_id);
8121 	return err;
8122 }
8123 
8124 static const struct got_error *
8125 ref_goto_line(struct tog_view *view, int nlines)
8126 {
8127 	const struct got_error		*err = NULL;
8128 	struct tog_ref_view_state	*s = &view->state.ref;
8129 	int				 g, idx = s->selected_entry->idx;
8130 
8131 	g = view->gline;
8132 	view->gline = 0;
8133 
8134 	if (g == 0)
8135 		g = 1;
8136 	else if (g > s->nrefs)
8137 		g = s->nrefs;
8138 
8139 	if (g >= s->first_displayed_entry->idx + 1 &&
8140 	    g <= s->last_displayed_entry->idx + 1 &&
8141 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8142 		s->selected = g - s->first_displayed_entry->idx - 1;
8143 		return NULL;
8144 	}
8145 
8146 	if (idx + 1 < g) {
8147 		err = ref_scroll_down(view, g - idx - 1);
8148 		if (err)
8149 			return err;
8150 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8151 		    s->first_displayed_entry->idx + s->selected < g &&
8152 		    s->selected < s->ndisplayed - 1)
8153 			s->selected = g - s->first_displayed_entry->idx - 1;
8154 	} else if (idx + 1 > g)
8155 		ref_scroll_up(s, idx - g + 1);
8156 
8157 	if (g < nlines && s->first_displayed_entry->idx == 0)
8158 		s->selected = g - 1;
8159 
8160 	return NULL;
8161 
8162 }
8163 
8164 static const struct got_error *
8165 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8166 {
8167 	const struct got_error *err = NULL;
8168 	struct tog_ref_view_state *s = &view->state.ref;
8169 	struct tog_reflist_entry *re;
8170 	int n, nscroll = view->nlines - 1;
8171 
8172 	if (view->gline)
8173 		return ref_goto_line(view, nscroll);
8174 
8175 	switch (ch) {
8176 	case 'i':
8177 		s->show_ids = !s->show_ids;
8178 		view->count = 0;
8179 		break;
8180 	case 'm':
8181 		s->show_date = !s->show_date;
8182 		view->count = 0;
8183 		break;
8184 	case 'o':
8185 		s->sort_by_date = !s->sort_by_date;
8186 		view->count = 0;
8187 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8188 		    got_ref_cmp_by_commit_timestamp_descending :
8189 		    tog_ref_cmp_by_name, s->repo);
8190 		if (err)
8191 			break;
8192 		got_reflist_object_id_map_free(tog_refs_idmap);
8193 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8194 		    &tog_refs, s->repo);
8195 		if (err)
8196 			break;
8197 		ref_view_free_refs(s);
8198 		err = ref_view_load_refs(s);
8199 		break;
8200 	case KEY_ENTER:
8201 	case '\r':
8202 		view->count = 0;
8203 		if (!s->selected_entry)
8204 			break;
8205 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8206 		break;
8207 	case 'T':
8208 		view->count = 0;
8209 		if (!s->selected_entry)
8210 			break;
8211 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8212 		break;
8213 	case 'g':
8214 	case KEY_HOME:
8215 		s->selected = 0;
8216 		view->count = 0;
8217 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8218 		break;
8219 	case 'G':
8220 	case KEY_END: {
8221 		int eos = view->nlines - 1;
8222 
8223 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8224 			--eos;  /* border */
8225 		s->selected = 0;
8226 		view->count = 0;
8227 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8228 		for (n = 0; n < eos; n++) {
8229 			if (re == NULL)
8230 				break;
8231 			s->first_displayed_entry = re;
8232 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8233 		}
8234 		if (n > 0)
8235 			s->selected = n - 1;
8236 		break;
8237 	}
8238 	case 'k':
8239 	case KEY_UP:
8240 	case CTRL('p'):
8241 		if (s->selected > 0) {
8242 			s->selected--;
8243 			break;
8244 		}
8245 		ref_scroll_up(s, 1);
8246 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8247 			view->count = 0;
8248 		break;
8249 	case CTRL('u'):
8250 	case 'u':
8251 		nscroll /= 2;
8252 		/* FALL THROUGH */
8253 	case KEY_PPAGE:
8254 	case CTRL('b'):
8255 	case 'b':
8256 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8257 			s->selected -= MIN(nscroll, s->selected);
8258 		ref_scroll_up(s, MAX(0, nscroll));
8259 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8260 			view->count = 0;
8261 		break;
8262 	case 'j':
8263 	case KEY_DOWN:
8264 	case CTRL('n'):
8265 		if (s->selected < s->ndisplayed - 1) {
8266 			s->selected++;
8267 			break;
8268 		}
8269 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8270 			/* can't scroll any further */
8271 			view->count = 0;
8272 			break;
8273 		}
8274 		ref_scroll_down(view, 1);
8275 		break;
8276 	case CTRL('d'):
8277 	case 'd':
8278 		nscroll /= 2;
8279 		/* FALL THROUGH */
8280 	case KEY_NPAGE:
8281 	case CTRL('f'):
8282 	case 'f':
8283 	case ' ':
8284 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8285 			/* can't scroll any further; move cursor down */
8286 			if (s->selected < s->ndisplayed - 1)
8287 				s->selected += MIN(nscroll,
8288 				    s->ndisplayed - s->selected - 1);
8289 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8290 				s->selected += s->ndisplayed - s->selected - 1;
8291 			view->count = 0;
8292 			break;
8293 		}
8294 		ref_scroll_down(view, nscroll);
8295 		break;
8296 	case CTRL('l'):
8297 		view->count = 0;
8298 		tog_free_refs();
8299 		err = tog_load_refs(s->repo, s->sort_by_date);
8300 		if (err)
8301 			break;
8302 		ref_view_free_refs(s);
8303 		err = ref_view_load_refs(s);
8304 		break;
8305 	case KEY_RESIZE:
8306 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8307 			s->selected = view->nlines - 2;
8308 		break;
8309 	default:
8310 		view->count = 0;
8311 		break;
8312 	}
8313 
8314 	return err;
8315 }
8316 
8317 __dead static void
8318 usage_ref(void)
8319 {
8320 	endwin();
8321 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8322 	    getprogname());
8323 	exit(1);
8324 }
8325 
8326 static const struct got_error *
8327 cmd_ref(int argc, char *argv[])
8328 {
8329 	const struct got_error *error;
8330 	struct got_repository *repo = NULL;
8331 	struct got_worktree *worktree = NULL;
8332 	char *cwd = NULL, *repo_path = NULL;
8333 	int ch;
8334 	struct tog_view *view;
8335 	int *pack_fds = NULL;
8336 
8337 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8338 		switch (ch) {
8339 		case 'r':
8340 			repo_path = realpath(optarg, NULL);
8341 			if (repo_path == NULL)
8342 				return got_error_from_errno2("realpath",
8343 				    optarg);
8344 			break;
8345 		default:
8346 			usage_ref();
8347 			/* NOTREACHED */
8348 		}
8349 	}
8350 
8351 	argc -= optind;
8352 	argv += optind;
8353 
8354 	if (argc > 1)
8355 		usage_ref();
8356 
8357 	error = got_repo_pack_fds_open(&pack_fds);
8358 	if (error != NULL)
8359 		goto done;
8360 
8361 	if (repo_path == NULL) {
8362 		cwd = getcwd(NULL, 0);
8363 		if (cwd == NULL)
8364 			return got_error_from_errno("getcwd");
8365 		error = got_worktree_open(&worktree, cwd);
8366 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8367 			goto done;
8368 		if (worktree)
8369 			repo_path =
8370 			    strdup(got_worktree_get_repo_path(worktree));
8371 		else
8372 			repo_path = strdup(cwd);
8373 		if (repo_path == NULL) {
8374 			error = got_error_from_errno("strdup");
8375 			goto done;
8376 		}
8377 	}
8378 
8379 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8380 	if (error != NULL)
8381 		goto done;
8382 
8383 	init_curses();
8384 
8385 	error = apply_unveil(got_repo_get_path(repo), NULL);
8386 	if (error)
8387 		goto done;
8388 
8389 	error = tog_load_refs(repo, 0);
8390 	if (error)
8391 		goto done;
8392 
8393 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8394 	if (view == NULL) {
8395 		error = got_error_from_errno("view_open");
8396 		goto done;
8397 	}
8398 
8399 	error = open_ref_view(view, repo);
8400 	if (error)
8401 		goto done;
8402 
8403 	if (worktree) {
8404 		/* Release work tree lock. */
8405 		got_worktree_close(worktree);
8406 		worktree = NULL;
8407 	}
8408 	error = view_loop(view);
8409 done:
8410 	free(repo_path);
8411 	free(cwd);
8412 	if (repo) {
8413 		const struct got_error *close_err = got_repo_close(repo);
8414 		if (close_err)
8415 			error = close_err;
8416 	}
8417 	if (pack_fds) {
8418 		const struct got_error *pack_err =
8419 		    got_repo_pack_fds_close(pack_fds);
8420 		if (error == NULL)
8421 			error = pack_err;
8422 	}
8423 	tog_free_refs();
8424 	return error;
8425 }
8426 
8427 static const struct got_error*
8428 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8429     const char *str)
8430 {
8431 	size_t len;
8432 
8433 	if (win == NULL)
8434 		win = stdscr;
8435 
8436 	len = strlen(str);
8437 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8438 
8439 	if (focus)
8440 		wstandout(win);
8441 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8442 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8443 	if (focus)
8444 		wstandend(win);
8445 
8446 	return NULL;
8447 }
8448 
8449 static const struct got_error *
8450 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8451 {
8452 	off_t *p;
8453 
8454 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8455 	if (p == NULL) {
8456 		free(*line_offsets);
8457 		*line_offsets = NULL;
8458 		return got_error_from_errno("reallocarray");
8459 	}
8460 
8461 	*line_offsets = p;
8462 	(*line_offsets)[*nlines] = off;
8463 	++(*nlines);
8464 	return NULL;
8465 }
8466 
8467 static const struct got_error *
8468 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8469 {
8470 	*ret = 0;
8471 
8472 	for (;n > 0; --n, ++km) {
8473 		char	*t0, *t, *k;
8474 		size_t	 len = 1;
8475 
8476 		if (km->keys == NULL)
8477 			continue;
8478 
8479 		t = t0 = strdup(km->keys);
8480 		if (t0 == NULL)
8481 			return got_error_from_errno("strdup");
8482 
8483 		len += strlen(t);
8484 		while ((k = strsep(&t, " ")) != NULL)
8485 			len += strlen(k) > 1 ? 2 : 0;
8486 		free(t0);
8487 		*ret = MAX(*ret, len);
8488 	}
8489 
8490 	return NULL;
8491 }
8492 
8493 /*
8494  * Write keymap section headers, keys, and key info in km to f.
8495  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8496  * wrap control and symbolic keys in guillemets, else use <>.
8497  */
8498 static const struct got_error *
8499 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8500 {
8501 	int n, len = width;
8502 
8503 	if (km->keys) {
8504 		static const char *u8_glyph[] = {
8505 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8506 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8507 		};
8508 		char	*t0, *t, *k;
8509 		int	 cs, s, first = 1;
8510 
8511 		cs = got_locale_is_utf8();
8512 
8513 		t = t0 = strdup(km->keys);
8514 		if (t0 == NULL)
8515 			return got_error_from_errno("strdup");
8516 
8517 		len = strlen(km->keys);
8518 		while ((k = strsep(&t, " ")) != NULL) {
8519 			s = strlen(k) > 1;  /* control or symbolic key */
8520 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8521 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8522 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8523 			if (n < 0) {
8524 				free(t0);
8525 				return got_error_from_errno("fprintf");
8526 			}
8527 			first = 0;
8528 			len += s ? 2 : 0;
8529 			*off += n;
8530 		}
8531 		free(t0);
8532 	}
8533 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8534 	if (n < 0)
8535 		return got_error_from_errno("fprintf");
8536 	*off += n;
8537 
8538 	return NULL;
8539 }
8540 
8541 static const struct got_error *
8542 format_help(struct tog_help_view_state *s)
8543 {
8544 	const struct got_error		*err = NULL;
8545 	off_t				 off = 0;
8546 	int				 i, max, n, show = s->all;
8547 	static const struct tog_key_map	 km[] = {
8548 #define KEYMAP_(info, type)	{ NULL, (info), type }
8549 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8550 		GENERATE_HELP
8551 #undef KEYMAP_
8552 #undef KEY_
8553 	};
8554 
8555 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8556 	if (err)
8557 		return err;
8558 
8559 	n = nitems(km);
8560 	err = max_key_str(&max, km, n);
8561 	if (err)
8562 		return err;
8563 
8564 	for (i = 0; i < n; ++i) {
8565 		if (km[i].keys == NULL) {
8566 			show = s->all;
8567 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8568 			    km[i].type == s->type || s->all)
8569 				show = 1;
8570 		}
8571 		if (show) {
8572 			err = format_help_line(&off, s->f, &km[i], max);
8573 			if (err)
8574 				return err;
8575 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8576 			if (err)
8577 				return err;
8578 		}
8579 	}
8580 	fputc('\n', s->f);
8581 	++off;
8582 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8583 	return err;
8584 }
8585 
8586 static const struct got_error *
8587 create_help(struct tog_help_view_state *s)
8588 {
8589 	FILE			*f;
8590 	const struct got_error	*err;
8591 
8592 	free(s->line_offsets);
8593 	s->line_offsets = NULL;
8594 	s->nlines = 0;
8595 
8596 	f = got_opentemp();
8597 	if (f == NULL)
8598 		return got_error_from_errno("got_opentemp");
8599 	s->f = f;
8600 
8601 	err = format_help(s);
8602 	if (err)
8603 		return err;
8604 
8605 	if (s->f && fflush(s->f) != 0)
8606 		return got_error_from_errno("fflush");
8607 
8608 	return NULL;
8609 }
8610 
8611 static const struct got_error *
8612 search_start_help_view(struct tog_view *view)
8613 {
8614 	view->state.help.matched_line = 0;
8615 	return NULL;
8616 }
8617 
8618 static void
8619 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8620     size_t *nlines, int **first, int **last, int **match, int **selected)
8621 {
8622 	struct tog_help_view_state *s = &view->state.help;
8623 
8624 	*f = s->f;
8625 	*nlines = s->nlines;
8626 	*line_offsets = s->line_offsets;
8627 	*match = &s->matched_line;
8628 	*first = &s->first_displayed_line;
8629 	*last = &s->last_displayed_line;
8630 	*selected = &s->selected_line;
8631 }
8632 
8633 static const struct got_error *
8634 show_help_view(struct tog_view *view)
8635 {
8636 	struct tog_help_view_state	*s = &view->state.help;
8637 	const struct got_error		*err;
8638 	regmatch_t			*regmatch = &view->regmatch;
8639 	wchar_t				*wline;
8640 	char				*line;
8641 	ssize_t				 linelen;
8642 	size_t				 linesz = 0;
8643 	int				 width, nprinted = 0, rc = 0;
8644 	int				 eos = view->nlines;
8645 
8646 	if (view_is_hsplit_top(view))
8647 		--eos;  /* account for border */
8648 
8649 	s->lineno = 0;
8650 	rewind(s->f);
8651 	werase(view->window);
8652 
8653 	if (view->gline > s->nlines - 1)
8654 		view->gline = s->nlines - 1;
8655 
8656 	err = win_draw_center(view->window, 0, 0, view->ncols,
8657 	    view_needs_focus_indication(view),
8658 	    "tog help (press q to return to tog)");
8659 	if (err)
8660 		return err;
8661 	if (eos <= 1)
8662 		return NULL;
8663 	waddstr(view->window, "\n\n");
8664 	eos -= 2;
8665 
8666 	s->eof = 0;
8667 	view->maxx = 0;
8668 	line = NULL;
8669 	while (eos > 0 && nprinted < eos) {
8670 		attr_t attr = 0;
8671 
8672 		linelen = getline(&line, &linesz, s->f);
8673 		if (linelen == -1) {
8674 			if (!feof(s->f)) {
8675 				free(line);
8676 				return got_ferror(s->f, GOT_ERR_IO);
8677 			}
8678 			s->eof = 1;
8679 			break;
8680 		}
8681 		if (++s->lineno < s->first_displayed_line)
8682 			continue;
8683 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8684 			continue;
8685 		if (s->lineno == view->hiline)
8686 			attr = A_STANDOUT;
8687 
8688 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8689 		    view->x ? 1 : 0);
8690 		if (err) {
8691 			free(line);
8692 			return err;
8693 		}
8694 		view->maxx = MAX(view->maxx, width);
8695 		free(wline);
8696 		wline = NULL;
8697 
8698 		if (attr)
8699 			wattron(view->window, attr);
8700 		if (s->first_displayed_line + nprinted == s->matched_line &&
8701 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8702 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8703 			    view->window, view->x, regmatch);
8704 			if (err) {
8705 				free(line);
8706 				return err;
8707 			}
8708 		} else {
8709 			int skip;
8710 
8711 			err = format_line(&wline, &width, &skip, line,
8712 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8713 			if (err) {
8714 				free(line);
8715 				return err;
8716 			}
8717 			rc = waddwstr(view->window, &wline[skip]);
8718 			free(wline);
8719 			wline = NULL;
8720 			if (rc == ERR)
8721 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8722 		}
8723 		if (s->lineno == view->hiline) {
8724 			while (width++ < view->ncols)
8725 				waddch(view->window, ' ');
8726 		} else {
8727 			if (width <= view->ncols)
8728 				waddch(view->window, '\n');
8729 		}
8730 		if (attr)
8731 			wattroff(view->window, attr);
8732 		if (++nprinted == 1)
8733 			s->first_displayed_line = s->lineno;
8734 	}
8735 	free(line);
8736 	if (nprinted > 0)
8737 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8738 	else
8739 		s->last_displayed_line = s->first_displayed_line;
8740 
8741 	view_border(view);
8742 
8743 	if (s->eof) {
8744 		rc = waddnstr(view->window,
8745 		    "See the tog(1) manual page for full documentation",
8746 		    view->ncols - 1);
8747 		if (rc == ERR)
8748 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8749 	} else {
8750 		wmove(view->window, view->nlines - 1, 0);
8751 		wclrtoeol(view->window);
8752 		wstandout(view->window);
8753 		rc = waddnstr(view->window, "scroll down for more...",
8754 		    view->ncols - 1);
8755 		if (rc == ERR)
8756 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8757 		if (getcurx(view->window) < view->ncols - 6) {
8758 			rc = wprintw(view->window, "[%.0f%%]",
8759 			    100.00 * s->last_displayed_line / s->nlines);
8760 			if (rc == ERR)
8761 				return got_error_msg(GOT_ERR_IO, "wprintw");
8762 		}
8763 		wstandend(view->window);
8764 	}
8765 
8766 	return NULL;
8767 }
8768 
8769 static const struct got_error *
8770 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8771 {
8772 	struct tog_help_view_state	*s = &view->state.help;
8773 	const struct got_error		*err = NULL;
8774 	char				*line = NULL;
8775 	ssize_t				 linelen;
8776 	size_t				 linesz = 0;
8777 	int				 eos, nscroll;
8778 
8779 	eos = nscroll = view->nlines;
8780 	if (view_is_hsplit_top(view))
8781 		--eos;  /* border */
8782 
8783 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8784 
8785 	switch (ch) {
8786 	case '0':
8787 		view->x = 0;
8788 		break;
8789 	case '$':
8790 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8791 		view->count = 0;
8792 		break;
8793 	case KEY_RIGHT:
8794 	case 'l':
8795 		if (view->x + view->ncols / 3 < view->maxx)
8796 			view->x += 2;
8797 		else
8798 			view->count = 0;
8799 		break;
8800 	case KEY_LEFT:
8801 	case 'h':
8802 		view->x -= MIN(view->x, 2);
8803 		if (view->x <= 0)
8804 			view->count = 0;
8805 		break;
8806 	case 'g':
8807 	case KEY_HOME:
8808 		s->first_displayed_line = 1;
8809 		view->count = 0;
8810 		break;
8811 	case 'G':
8812 	case KEY_END:
8813 		view->count = 0;
8814 		if (s->eof)
8815 			break;
8816 		s->first_displayed_line = (s->nlines - eos) + 3;
8817 		s->eof = 1;
8818 		break;
8819 	case 'k':
8820 	case KEY_UP:
8821 		if (s->first_displayed_line > 1)
8822 			--s->first_displayed_line;
8823 		else
8824 			view->count = 0;
8825 		break;
8826 	case CTRL('u'):
8827 	case 'u':
8828 		nscroll /= 2;
8829 		/* FALL THROUGH */
8830 	case KEY_PPAGE:
8831 	case CTRL('b'):
8832 	case 'b':
8833 		if (s->first_displayed_line == 1) {
8834 			view->count = 0;
8835 			break;
8836 		}
8837 		while (--nscroll > 0 && s->first_displayed_line > 1)
8838 			s->first_displayed_line--;
8839 		break;
8840 	case 'j':
8841 	case KEY_DOWN:
8842 	case CTRL('n'):
8843 		if (!s->eof)
8844 			++s->first_displayed_line;
8845 		else
8846 			view->count = 0;
8847 		break;
8848 	case CTRL('d'):
8849 	case 'd':
8850 		nscroll /= 2;
8851 		/* FALL THROUGH */
8852 	case KEY_NPAGE:
8853 	case CTRL('f'):
8854 	case 'f':
8855 	case ' ':
8856 		if (s->eof) {
8857 			view->count = 0;
8858 			break;
8859 		}
8860 		while (!s->eof && --nscroll > 0) {
8861 			linelen = getline(&line, &linesz, s->f);
8862 			s->first_displayed_line++;
8863 			if (linelen == -1) {
8864 				if (feof(s->f))
8865 					s->eof = 1;
8866 				else
8867 					err = got_ferror(s->f, GOT_ERR_IO);
8868 				break;
8869 			}
8870 		}
8871 		free(line);
8872 		break;
8873 	default:
8874 		view->count = 0;
8875 		break;
8876 	}
8877 
8878 	return err;
8879 }
8880 
8881 static const struct got_error *
8882 close_help_view(struct tog_view *view)
8883 {
8884 	struct tog_help_view_state *s = &view->state.help;
8885 
8886 	free(s->line_offsets);
8887 	s->line_offsets = NULL;
8888 	if (fclose(s->f) == EOF)
8889 		return got_error_from_errno("fclose");
8890 
8891 	return NULL;
8892 }
8893 
8894 static const struct got_error *
8895 reset_help_view(struct tog_view *view)
8896 {
8897 	struct tog_help_view_state *s = &view->state.help;
8898 
8899 
8900 	if (s->f && fclose(s->f) == EOF)
8901 		return got_error_from_errno("fclose");
8902 
8903 	wclear(view->window);
8904 	view->count = 0;
8905 	view->x = 0;
8906 	s->all = !s->all;
8907 	s->first_displayed_line = 1;
8908 	s->last_displayed_line = view->nlines;
8909 	s->matched_line = 0;
8910 
8911 	return create_help(s);
8912 }
8913 
8914 static const struct got_error *
8915 open_help_view(struct tog_view *view, struct tog_view *parent)
8916 {
8917 	const struct got_error		*err = NULL;
8918 	struct tog_help_view_state	*s = &view->state.help;
8919 
8920 	s->type = (enum tog_keymap_type)parent->type;
8921 	s->first_displayed_line = 1;
8922 	s->last_displayed_line = view->nlines;
8923 	s->selected_line = 1;
8924 
8925 	view->show = show_help_view;
8926 	view->input = input_help_view;
8927 	view->reset = reset_help_view;
8928 	view->close = close_help_view;
8929 	view->search_start = search_start_help_view;
8930 	view->search_setup = search_setup_help_view;
8931 	view->search_next = search_next_view_match;
8932 
8933 	err = create_help(s);
8934 	return err;
8935 }
8936 
8937 static const struct got_error *
8938 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8939     enum tog_view_type request, int y, int x)
8940 {
8941 	const struct got_error *err = NULL;
8942 
8943 	*new_view = NULL;
8944 
8945 	switch (request) {
8946 	case TOG_VIEW_DIFF:
8947 		if (view->type == TOG_VIEW_LOG) {
8948 			struct tog_log_view_state *s = &view->state.log;
8949 
8950 			err = open_diff_view_for_commit(new_view, y, x,
8951 			    s->selected_entry->commit, s->selected_entry->id,
8952 			    view, 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_BLAME:
8958 		if (view->type == TOG_VIEW_TREE) {
8959 			struct tog_tree_view_state *s = &view->state.tree;
8960 
8961 			err = blame_tree_entry(new_view, y, x,
8962 			    s->selected_entry, &s->parents, s->commit_id,
8963 			    s->repo);
8964 		} else
8965 			return got_error_msg(GOT_ERR_NOT_IMPL,
8966 			    "parent/child view pair not supported");
8967 		break;
8968 	case TOG_VIEW_LOG:
8969 		if (view->type == TOG_VIEW_BLAME)
8970 			err = log_annotated_line(new_view, y, x,
8971 			    view->state.blame.repo, view->state.blame.id_to_log);
8972 		else if (view->type == TOG_VIEW_TREE)
8973 			err = log_selected_tree_entry(new_view, y, x,
8974 			    &view->state.tree);
8975 		else if (view->type == TOG_VIEW_REF)
8976 			err = log_ref_entry(new_view, y, x,
8977 			    view->state.ref.selected_entry,
8978 			    view->state.ref.repo);
8979 		else
8980 			return got_error_msg(GOT_ERR_NOT_IMPL,
8981 			    "parent/child view pair not supported");
8982 		break;
8983 	case TOG_VIEW_TREE:
8984 		if (view->type == TOG_VIEW_LOG)
8985 			err = browse_commit_tree(new_view, y, x,
8986 			    view->state.log.selected_entry,
8987 			    view->state.log.in_repo_path,
8988 			    view->state.log.head_ref_name,
8989 			    view->state.log.repo);
8990 		else if (view->type == TOG_VIEW_REF)
8991 			err = browse_ref_tree(new_view, y, x,
8992 			    view->state.ref.selected_entry,
8993 			    view->state.ref.repo);
8994 		else
8995 			return got_error_msg(GOT_ERR_NOT_IMPL,
8996 			    "parent/child view pair not supported");
8997 		break;
8998 	case TOG_VIEW_REF:
8999 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9000 		if (*new_view == NULL)
9001 			return got_error_from_errno("view_open");
9002 		if (view->type == TOG_VIEW_LOG)
9003 			err = open_ref_view(*new_view, view->state.log.repo);
9004 		else if (view->type == TOG_VIEW_TREE)
9005 			err = open_ref_view(*new_view, view->state.tree.repo);
9006 		else
9007 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9008 			    "parent/child view pair not supported");
9009 		if (err)
9010 			view_close(*new_view);
9011 		break;
9012 	case TOG_VIEW_HELP:
9013 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9014 		if (*new_view == NULL)
9015 			return got_error_from_errno("view_open");
9016 		err = open_help_view(*new_view, view);
9017 		if (err)
9018 			view_close(*new_view);
9019 		break;
9020 	default:
9021 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9022 	}
9023 
9024 	return err;
9025 }
9026 
9027 /*
9028  * If view was scrolled down to move the selected line into view when opening a
9029  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9030  */
9031 static void
9032 offset_selection_up(struct tog_view *view)
9033 {
9034 	switch (view->type) {
9035 	case TOG_VIEW_BLAME: {
9036 		struct tog_blame_view_state *s = &view->state.blame;
9037 		if (s->first_displayed_line == 1) {
9038 			s->selected_line = MAX(s->selected_line - view->offset,
9039 			    1);
9040 			break;
9041 		}
9042 		if (s->first_displayed_line > view->offset)
9043 			s->first_displayed_line -= view->offset;
9044 		else
9045 			s->first_displayed_line = 1;
9046 		s->selected_line += view->offset;
9047 		break;
9048 	}
9049 	case TOG_VIEW_LOG:
9050 		log_scroll_up(&view->state.log, view->offset);
9051 		view->state.log.selected += view->offset;
9052 		break;
9053 	case TOG_VIEW_REF:
9054 		ref_scroll_up(&view->state.ref, view->offset);
9055 		view->state.ref.selected += view->offset;
9056 		break;
9057 	case TOG_VIEW_TREE:
9058 		tree_scroll_up(&view->state.tree, view->offset);
9059 		view->state.tree.selected += view->offset;
9060 		break;
9061 	default:
9062 		break;
9063 	}
9064 
9065 	view->offset = 0;
9066 }
9067 
9068 /*
9069  * If the selected line is in the section of screen covered by the bottom split,
9070  * scroll down offset lines to move it into view and index its new position.
9071  */
9072 static const struct got_error *
9073 offset_selection_down(struct tog_view *view)
9074 {
9075 	const struct got_error	*err = NULL;
9076 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9077 	int			*selected = NULL;
9078 	int			 header, offset;
9079 
9080 	switch (view->type) {
9081 	case TOG_VIEW_BLAME: {
9082 		struct tog_blame_view_state *s = &view->state.blame;
9083 		header = 3;
9084 		scrolld = NULL;
9085 		if (s->selected_line > view->nlines - header) {
9086 			offset = abs(view->nlines - s->selected_line - header);
9087 			s->first_displayed_line += offset;
9088 			s->selected_line -= offset;
9089 			view->offset = offset;
9090 		}
9091 		break;
9092 	}
9093 	case TOG_VIEW_LOG: {
9094 		struct tog_log_view_state *s = &view->state.log;
9095 		scrolld = &log_scroll_down;
9096 		header = view_is_parent_view(view) ? 3 : 2;
9097 		selected = &s->selected;
9098 		break;
9099 	}
9100 	case TOG_VIEW_REF: {
9101 		struct tog_ref_view_state *s = &view->state.ref;
9102 		scrolld = &ref_scroll_down;
9103 		header = 3;
9104 		selected = &s->selected;
9105 		break;
9106 	}
9107 	case TOG_VIEW_TREE: {
9108 		struct tog_tree_view_state *s = &view->state.tree;
9109 		scrolld = &tree_scroll_down;
9110 		header = 5;
9111 		selected = &s->selected;
9112 		break;
9113 	}
9114 	default:
9115 		selected = NULL;
9116 		scrolld = NULL;
9117 		header = 0;
9118 		break;
9119 	}
9120 
9121 	if (selected && *selected > view->nlines - header) {
9122 		offset = abs(view->nlines - *selected - header);
9123 		view->offset = offset;
9124 		if (scrolld && offset) {
9125 			err = scrolld(view, offset);
9126 			*selected -= offset;
9127 		}
9128 	}
9129 
9130 	return err;
9131 }
9132 
9133 static void
9134 list_commands(FILE *fp)
9135 {
9136 	size_t i;
9137 
9138 	fprintf(fp, "commands:");
9139 	for (i = 0; i < nitems(tog_commands); i++) {
9140 		const struct tog_cmd *cmd = &tog_commands[i];
9141 		fprintf(fp, " %s", cmd->name);
9142 	}
9143 	fputc('\n', fp);
9144 }
9145 
9146 __dead static void
9147 usage(int hflag, int status)
9148 {
9149 	FILE *fp = (status == 0) ? stdout : stderr;
9150 
9151 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9152 	    getprogname());
9153 	if (hflag) {
9154 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9155 		list_commands(fp);
9156 	}
9157 	exit(status);
9158 }
9159 
9160 static char **
9161 make_argv(int argc, ...)
9162 {
9163 	va_list ap;
9164 	char **argv;
9165 	int i;
9166 
9167 	va_start(ap, argc);
9168 
9169 	argv = calloc(argc, sizeof(char *));
9170 	if (argv == NULL)
9171 		err(1, "calloc");
9172 	for (i = 0; i < argc; i++) {
9173 		argv[i] = strdup(va_arg(ap, char *));
9174 		if (argv[i] == NULL)
9175 			err(1, "strdup");
9176 	}
9177 
9178 	va_end(ap);
9179 	return argv;
9180 }
9181 
9182 /*
9183  * Try to convert 'tog path' into a 'tog log path' command.
9184  * The user could simply have mistyped the command rather than knowingly
9185  * provided a path. So check whether argv[0] can in fact be resolved
9186  * to a path in the HEAD commit and print a special error if not.
9187  * This hack is for mpi@ <3
9188  */
9189 static const struct got_error *
9190 tog_log_with_path(int argc, char *argv[])
9191 {
9192 	const struct got_error *error = NULL, *close_err;
9193 	const struct tog_cmd *cmd = NULL;
9194 	struct got_repository *repo = NULL;
9195 	struct got_worktree *worktree = NULL;
9196 	struct got_object_id *commit_id = NULL, *id = NULL;
9197 	struct got_commit_object *commit = NULL;
9198 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9199 	char *commit_id_str = NULL, **cmd_argv = NULL;
9200 	int *pack_fds = NULL;
9201 
9202 	cwd = getcwd(NULL, 0);
9203 	if (cwd == NULL)
9204 		return got_error_from_errno("getcwd");
9205 
9206 	error = got_repo_pack_fds_open(&pack_fds);
9207 	if (error != NULL)
9208 		goto done;
9209 
9210 	error = got_worktree_open(&worktree, cwd);
9211 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9212 		goto done;
9213 
9214 	if (worktree)
9215 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9216 	else
9217 		repo_path = strdup(cwd);
9218 	if (repo_path == NULL) {
9219 		error = got_error_from_errno("strdup");
9220 		goto done;
9221 	}
9222 
9223 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9224 	if (error != NULL)
9225 		goto done;
9226 
9227 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9228 	    repo, worktree);
9229 	if (error)
9230 		goto done;
9231 
9232 	error = tog_load_refs(repo, 0);
9233 	if (error)
9234 		goto done;
9235 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9236 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9237 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9238 	if (error)
9239 		goto done;
9240 
9241 	if (worktree) {
9242 		got_worktree_close(worktree);
9243 		worktree = NULL;
9244 	}
9245 
9246 	error = got_object_open_as_commit(&commit, repo, commit_id);
9247 	if (error)
9248 		goto done;
9249 
9250 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9251 	if (error) {
9252 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9253 			goto done;
9254 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9255 		    getprogname(), argv[0]);
9256 		usage(1, 1);
9257 		/* not reached */
9258 	}
9259 
9260 	error = got_object_id_str(&commit_id_str, commit_id);
9261 	if (error)
9262 		goto done;
9263 
9264 	cmd = &tog_commands[0]; /* log */
9265 	argc = 4;
9266 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9267 	error = cmd->cmd_main(argc, cmd_argv);
9268 done:
9269 	if (repo) {
9270 		close_err = got_repo_close(repo);
9271 		if (error == NULL)
9272 			error = close_err;
9273 	}
9274 	if (commit)
9275 		got_object_commit_close(commit);
9276 	if (worktree)
9277 		got_worktree_close(worktree);
9278 	if (pack_fds) {
9279 		const struct got_error *pack_err =
9280 		    got_repo_pack_fds_close(pack_fds);
9281 		if (error == NULL)
9282 			error = pack_err;
9283 	}
9284 	free(id);
9285 	free(commit_id_str);
9286 	free(commit_id);
9287 	free(cwd);
9288 	free(repo_path);
9289 	free(in_repo_path);
9290 	if (cmd_argv) {
9291 		int i;
9292 		for (i = 0; i < argc; i++)
9293 			free(cmd_argv[i]);
9294 		free(cmd_argv);
9295 	}
9296 	tog_free_refs();
9297 	return error;
9298 }
9299 
9300 int
9301 main(int argc, char *argv[])
9302 {
9303 	const struct got_error *error = NULL;
9304 	const struct tog_cmd *cmd = NULL;
9305 	int ch, hflag = 0, Vflag = 0;
9306 	char **cmd_argv = NULL;
9307 	static const struct option longopts[] = {
9308 	    { "version", no_argument, NULL, 'V' },
9309 	    { NULL, 0, NULL, 0}
9310 	};
9311 	char *diff_algo_str = NULL;
9312 
9313 	if (!isatty(STDIN_FILENO))
9314 		errx(1, "standard input is not a tty");
9315 
9316 	setlocale(LC_CTYPE, "");
9317 
9318 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9319 		switch (ch) {
9320 		case 'h':
9321 			hflag = 1;
9322 			break;
9323 		case 'V':
9324 			Vflag = 1;
9325 			break;
9326 		default:
9327 			usage(hflag, 1);
9328 			/* NOTREACHED */
9329 		}
9330 	}
9331 
9332 	argc -= optind;
9333 	argv += optind;
9334 	optind = 1;
9335 	optreset = 1;
9336 
9337 	if (Vflag) {
9338 		got_version_print_str();
9339 		return 0;
9340 	}
9341 
9342 #ifndef PROFILE
9343 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9344 	    NULL) == -1)
9345 		err(1, "pledge");
9346 #endif
9347 
9348 	if (argc == 0) {
9349 		if (hflag)
9350 			usage(hflag, 0);
9351 		/* Build an argument vector which runs a default command. */
9352 		cmd = &tog_commands[0];
9353 		argc = 1;
9354 		cmd_argv = make_argv(argc, cmd->name);
9355 	} else {
9356 		size_t i;
9357 
9358 		/* Did the user specify a command? */
9359 		for (i = 0; i < nitems(tog_commands); i++) {
9360 			if (strncmp(tog_commands[i].name, argv[0],
9361 			    strlen(argv[0])) == 0) {
9362 				cmd = &tog_commands[i];
9363 				break;
9364 			}
9365 		}
9366 	}
9367 
9368 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9369 	if (diff_algo_str) {
9370 		if (strcasecmp(diff_algo_str, "patience") == 0)
9371 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9372 		if (strcasecmp(diff_algo_str, "myers") == 0)
9373 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9374 	}
9375 
9376 	if (cmd == NULL) {
9377 		if (argc != 1)
9378 			usage(0, 1);
9379 		/* No command specified; try log with a path */
9380 		error = tog_log_with_path(argc, argv);
9381 	} else {
9382 		if (hflag)
9383 			cmd->cmd_usage();
9384 		else
9385 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9386 	}
9387 
9388 	endwin();
9389 	putchar('\n');
9390 	if (cmd_argv) {
9391 		int i;
9392 		for (i = 0; i < argc; i++)
9393 			free(cmd_argv[i]);
9394 		free(cmd_argv);
9395 	}
9396 
9397 	if (error && error->code != GOT_ERR_CANCELLED &&
9398 	    error->code != GOT_ERR_EOF &&
9399 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9400 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9401 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9402 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9403 	return 0;
9404 }