1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 	TOG_VIEW_HELP
107 };
108 
109 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
110 enum tog_keymap_type {
111 	TOG_KEYMAP_KEYS = -2,
112 	TOG_KEYMAP_GLOBAL,
113 	TOG_KEYMAP_DIFF,
114 	TOG_KEYMAP_LOG,
115 	TOG_KEYMAP_BLAME,
116 	TOG_KEYMAP_TREE,
117 	TOG_KEYMAP_REF,
118 	TOG_KEYMAP_HELP
119 };
120 
121 enum tog_view_mode {
122 	TOG_VIEW_SPLIT_NONE,
123 	TOG_VIEW_SPLIT_VERT,
124 	TOG_VIEW_SPLIT_HRZN
125 };
126 
127 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
128 
129 #define TOG_EOF_STRING	"(END)"
130 
131 struct commit_queue_entry {
132 	TAILQ_ENTRY(commit_queue_entry) entry;
133 	struct got_object_id *id;
134 	struct got_commit_object *commit;
135 	int idx;
136 };
137 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
138 struct commit_queue {
139 	int ncommits;
140 	struct commit_queue_head head;
141 };
142 
143 struct tog_color {
144 	STAILQ_ENTRY(tog_color) entry;
145 	regex_t regex;
146 	short colorpair;
147 };
148 STAILQ_HEAD(tog_colors, tog_color);
149 
150 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
151 static struct got_reflist_object_id_map *tog_refs_idmap;
152 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
153 
154 static const struct got_error *
155 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
156     struct got_reference* re2)
157 {
158 	const char *name1 = got_ref_get_name(re1);
159 	const char *name2 = got_ref_get_name(re2);
160 	int isbackup1, isbackup2;
161 
162 	/* Sort backup refs towards the bottom of the list. */
163 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
164 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
165 	if (!isbackup1 && isbackup2) {
166 		*cmp = -1;
167 		return NULL;
168 	} else if (isbackup1 && !isbackup2) {
169 		*cmp = 1;
170 		return NULL;
171 	}
172 
173 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 tog_load_refs(struct got_repository *repo, int sort_by_date)
179 {
180 	const struct got_error *err;
181 
182 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
183 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
184 	    repo);
185 	if (err)
186 		return err;
187 
188 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
189 	    repo);
190 }
191 
192 static void
193 tog_free_refs(void)
194 {
195 	if (tog_refs_idmap) {
196 		got_reflist_object_id_map_free(tog_refs_idmap);
197 		tog_refs_idmap = NULL;
198 	}
199 	got_ref_list_free(&tog_refs);
200 }
201 
202 static const struct got_error *
203 add_color(struct tog_colors *colors, const char *pattern,
204     int idx, short color)
205 {
206 	const struct got_error *err = NULL;
207 	struct tog_color *tc;
208 	int regerr = 0;
209 
210 	if (idx < 1 || idx > COLOR_PAIRS - 1)
211 		return NULL;
212 
213 	init_pair(idx, color, -1);
214 
215 	tc = calloc(1, sizeof(*tc));
216 	if (tc == NULL)
217 		return got_error_from_errno("calloc");
218 	regerr = regcomp(&tc->regex, pattern,
219 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
220 	if (regerr) {
221 		static char regerr_msg[512];
222 		static char err_msg[512];
223 		regerror(regerr, &tc->regex, regerr_msg,
224 		    sizeof(regerr_msg));
225 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
226 		    regerr_msg);
227 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
228 		free(tc);
229 		return err;
230 	}
231 	tc->colorpair = idx;
232 	STAILQ_INSERT_HEAD(colors, tc, entry);
233 	return NULL;
234 }
235 
236 static void
237 free_colors(struct tog_colors *colors)
238 {
239 	struct tog_color *tc;
240 
241 	while (!STAILQ_EMPTY(colors)) {
242 		tc = STAILQ_FIRST(colors);
243 		STAILQ_REMOVE_HEAD(colors, entry);
244 		regfree(&tc->regex);
245 		free(tc);
246 	}
247 }
248 
249 static struct tog_color *
250 get_color(struct tog_colors *colors, int colorpair)
251 {
252 	struct tog_color *tc = NULL;
253 
254 	STAILQ_FOREACH(tc, colors, entry) {
255 		if (tc->colorpair == colorpair)
256 			return tc;
257 	}
258 
259 	return NULL;
260 }
261 
262 static int
263 default_color_value(const char *envvar)
264 {
265 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
268 		return COLOR_CYAN;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
274 		return COLOR_MAGENTA;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
278 		return COLOR_CYAN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
286 		return COLOR_YELLOW;
287 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
290 		return COLOR_MAGENTA;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
294 		return COLOR_CYAN;
295 
296 	return -1;
297 }
298 
299 static int
300 get_color_value(const char *envvar)
301 {
302 	const char *val = getenv(envvar);
303 
304 	if (val == NULL)
305 		return default_color_value(envvar);
306 
307 	if (strcasecmp(val, "black") == 0)
308 		return COLOR_BLACK;
309 	if (strcasecmp(val, "red") == 0)
310 		return COLOR_RED;
311 	if (strcasecmp(val, "green") == 0)
312 		return COLOR_GREEN;
313 	if (strcasecmp(val, "yellow") == 0)
314 		return COLOR_YELLOW;
315 	if (strcasecmp(val, "blue") == 0)
316 		return COLOR_BLUE;
317 	if (strcasecmp(val, "magenta") == 0)
318 		return COLOR_MAGENTA;
319 	if (strcasecmp(val, "cyan") == 0)
320 		return COLOR_CYAN;
321 	if (strcasecmp(val, "white") == 0)
322 		return COLOR_WHITE;
323 	if (strcasecmp(val, "default") == 0)
324 		return -1;
325 
326 	return default_color_value(envvar);
327 }
328 
329 struct tog_diff_view_state {
330 	struct got_object_id *id1, *id2;
331 	const char *label1, *label2;
332 	FILE *f, *f1, *f2;
333 	int fd1, fd2;
334 	int lineno;
335 	int first_displayed_line;
336 	int last_displayed_line;
337 	int eof;
338 	int diff_context;
339 	int ignore_whitespace;
340 	int force_text_diff;
341 	struct got_repository *repo;
342 	struct got_diff_line *lines;
343 	size_t nlines;
344 	int matched_line;
345 	int selected_line;
346 
347 	/* passed from log or blame view; may be NULL */
348 	struct tog_view *parent_view;
349 };
350 
351 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
352 static volatile sig_atomic_t tog_thread_error;
353 
354 struct tog_log_thread_args {
355 	pthread_cond_t need_commits;
356 	pthread_cond_t commit_loaded;
357 	int commits_needed;
358 	int load_all;
359 	struct got_commit_graph *graph;
360 	struct commit_queue *real_commits;
361 	const char *in_repo_path;
362 	struct got_object_id *start_id;
363 	struct got_repository *repo;
364 	int *pack_fds;
365 	int log_complete;
366 	sig_atomic_t *quit;
367 	struct commit_queue_entry **first_displayed_entry;
368 	struct commit_queue_entry **selected_entry;
369 	int *searching;
370 	int *search_next_done;
371 	regex_t *regex;
372 	int *limiting;
373 	int limit_match;
374 	regex_t *limit_regex;
375 	struct commit_queue *limit_commits;
376 };
377 
378 struct tog_log_view_state {
379 	struct commit_queue *commits;
380 	struct commit_queue_entry *first_displayed_entry;
381 	struct commit_queue_entry *last_displayed_entry;
382 	struct commit_queue_entry *selected_entry;
383 	struct commit_queue real_commits;
384 	int selected;
385 	char *in_repo_path;
386 	char *head_ref_name;
387 	int log_branches;
388 	struct got_repository *repo;
389 	struct got_object_id *start_id;
390 	sig_atomic_t quit;
391 	pthread_t thread;
392 	struct tog_log_thread_args thread_args;
393 	struct commit_queue_entry *matched_entry;
394 	struct commit_queue_entry *search_entry;
395 	struct tog_colors colors;
396 	int use_committer;
397 	int limit_view;
398 	regex_t limit_regex;
399 	struct commit_queue limit_commits;
400 };
401 
402 #define TOG_COLOR_DIFF_MINUS		1
403 #define TOG_COLOR_DIFF_PLUS		2
404 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
405 #define TOG_COLOR_DIFF_META		4
406 #define TOG_COLOR_TREE_SUBMODULE	5
407 #define TOG_COLOR_TREE_SYMLINK		6
408 #define TOG_COLOR_TREE_DIRECTORY	7
409 #define TOG_COLOR_TREE_EXECUTABLE	8
410 #define TOG_COLOR_COMMIT		9
411 #define TOG_COLOR_AUTHOR		10
412 #define TOG_COLOR_DATE			11
413 #define TOG_COLOR_REFS_HEADS		12
414 #define TOG_COLOR_REFS_TAGS		13
415 #define TOG_COLOR_REFS_REMOTES		14
416 #define TOG_COLOR_REFS_BACKUP		15
417 
418 struct tog_blame_cb_args {
419 	struct tog_blame_line *lines; /* one per line */
420 	int nlines;
421 
422 	struct tog_view *view;
423 	struct got_object_id *commit_id;
424 	int *quit;
425 };
426 
427 struct tog_blame_thread_args {
428 	const char *path;
429 	struct got_repository *repo;
430 	struct tog_blame_cb_args *cb_args;
431 	int *complete;
432 	got_cancel_cb cancel_cb;
433 	void *cancel_arg;
434 };
435 
436 struct tog_blame {
437 	FILE *f;
438 	off_t filesize;
439 	struct tog_blame_line *lines;
440 	int nlines;
441 	off_t *line_offsets;
442 	pthread_t thread;
443 	struct tog_blame_thread_args thread_args;
444 	struct tog_blame_cb_args cb_args;
445 	const char *path;
446 	int *pack_fds;
447 };
448 
449 struct tog_blame_view_state {
450 	int first_displayed_line;
451 	int last_displayed_line;
452 	int selected_line;
453 	int last_diffed_line;
454 	int blame_complete;
455 	int eof;
456 	int done;
457 	struct got_object_id_queue blamed_commits;
458 	struct got_object_qid *blamed_commit;
459 	char *path;
460 	struct got_repository *repo;
461 	struct got_object_id *commit_id;
462 	struct got_object_id *id_to_log;
463 	struct tog_blame blame;
464 	int matched_line;
465 	struct tog_colors colors;
466 };
467 
468 struct tog_parent_tree {
469 	TAILQ_ENTRY(tog_parent_tree) entry;
470 	struct got_tree_object *tree;
471 	struct got_tree_entry *first_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int selected;
474 };
475 
476 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
477 
478 struct tog_tree_view_state {
479 	char *tree_label;
480 	struct got_object_id *commit_id;/* commit which this tree belongs to */
481 	struct got_tree_object *root;	/* the commit's root tree entry */
482 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
483 	struct got_tree_entry *first_displayed_entry;
484 	struct got_tree_entry *last_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int ndisplayed, selected, show_ids;
487 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
488 	char *head_ref_name;
489 	struct got_repository *repo;
490 	struct got_tree_entry *matched_entry;
491 	struct tog_colors colors;
492 };
493 
494 struct tog_reflist_entry {
495 	TAILQ_ENTRY(tog_reflist_entry) entry;
496 	struct got_reference *ref;
497 	int idx;
498 };
499 
500 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
501 
502 struct tog_ref_view_state {
503 	struct tog_reflist_head refs;
504 	struct tog_reflist_entry *first_displayed_entry;
505 	struct tog_reflist_entry *last_displayed_entry;
506 	struct tog_reflist_entry *selected_entry;
507 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
508 	struct got_repository *repo;
509 	struct tog_reflist_entry *matched_entry;
510 	struct tog_colors colors;
511 };
512 
513 struct tog_help_view_state {
514 	FILE			*f;
515 	off_t			*line_offsets;
516 	size_t			 nlines;
517 	int			 lineno;
518 	int			 first_displayed_line;
519 	int			 last_displayed_line;
520 	int			 eof;
521 	int			 matched_line;
522 	int			 selected_line;
523 	int			 all;
524 	enum tog_keymap_type	 type;
525 };
526 
527 #define GENERATE_HELP \
528 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
529 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
530 	KEY_("k C-p Up", "Move cursor or page up one line"), \
531 	KEY_("j C-n Down", "Move cursor or page down one line"), \
532 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
533 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
534 	KEY_("C-u u", "Scroll the view up one half page"), \
535 	KEY_("C-d d", "Scroll the view down one half page"), \
536 	KEY_("g Home", "Go to line N (default: first line)"), \
537 	KEY_("G End", "Go to line N (default: last line)"), \
538 	KEY_("l Right", "Scroll the view right"), \
539 	KEY_("h Left", "Scroll the view left"), \
540 	KEY_("$", "Scroll view to the rightmost position"), \
541 	KEY_("0", "Scroll view to the leftmost position"), \
542 	KEY_("-", "Decrease size of the focussed split"), \
543 	KEY_("+", "Increase size of the focussed split"), \
544 	KEY_("Tab", "Switch focus between views"), \
545 	KEY_("F", "Toggle fullscreen mode"), \
546 	KEY_("/", "Open prompt to enter search term"), \
547 	KEY_("n", "Find next line/token matching the current search term"), \
548 	KEY_("N", "Find previous line/token matching the current search term"),\
549 	KEY_("q", "Quit the focussed view; Quit help screen"), \
550 	KEY_("Q", "Quit tog"), \
551 	\
552 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
553 	KEY_("< ,", "Move cursor up one commit"), \
554 	KEY_("> .", "Move cursor down one commit"), \
555 	KEY_("Enter", "Open diff view of the selected commit"), \
556 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
557 	KEY_("R", "Open ref view of all repository references"), \
558 	KEY_("T", "Display tree view of the repository from the selected" \
559 	    " commit"), \
560 	KEY_("@", "Toggle between displaying author and committer name"), \
561 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
562 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
563 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
564 	\
565 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
566 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
567 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
568 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
569 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
570 	    " data"), \
571 	KEY_("(", "Go to the previous file in the diff"), \
572 	KEY_(")", "Go to the next file in the diff"), \
573 	KEY_("{", "Go to the previous hunk in the diff"), \
574 	KEY_("}", "Go to the next hunk in the diff"), \
575 	KEY_("[", "Decrease the number of context lines"), \
576 	KEY_("]", "Increase the number of context lines"), \
577 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
578 	\
579 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
580 	KEY_("Enter", "Display diff view of the selected line's commit"), \
581 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
582 	KEY_("L", "Open log view for the currently selected annotated line"), \
583 	KEY_("C", "Reload view with the previously blamed commit"), \
584 	KEY_("c", "Reload view with the version of the file found in the" \
585 	    " selected line's commit"), \
586 	KEY_("p", "Reload view with the version of the file found in the" \
587 	    " selected line's parent commit"), \
588 	\
589 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
590 	KEY_("Enter", "Enter selected directory or open blame view of the" \
591 	    " selected file"), \
592 	KEY_("L", "Open log view for the selected entry"), \
593 	KEY_("R", "Open ref view of all repository references"), \
594 	KEY_("i", "Show object IDs for all tree entries"), \
595 	KEY_("Backspace", "Return to the parent directory"), \
596 	\
597 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
598 	KEY_("Enter", "Display log view of the selected reference"), \
599 	KEY_("T", "Display tree view of the selected reference"), \
600 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
601 	KEY_("m", "Toggle display of last modified date for each reference"), \
602 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
603 	KEY_("C-l", "Reload view with all repository references")
604 
605 struct tog_key_map {
606 	const char		*keys;
607 	const char		*info;
608 	enum tog_keymap_type	 type;
609 };
610 
611 /*
612  * We implement two types of views: parent views and child views.
613  *
614  * The 'Tab' key switches focus between a parent view and its child view.
615  * Child views are shown side-by-side to their parent view, provided
616  * there is enough screen estate.
617  *
618  * When a new view is opened from within a parent view, this new view
619  * becomes a child view of the parent view, replacing any existing child.
620  *
621  * When a new view is opened from within a child view, this new view
622  * becomes a parent view which will obscure the views below until the
623  * user quits the new parent view by typing 'q'.
624  *
625  * This list of views contains parent views only.
626  * Child views are only pointed to by their parent view.
627  */
628 TAILQ_HEAD(tog_view_list_head, tog_view);
629 
630 struct tog_view {
631 	TAILQ_ENTRY(tog_view) entry;
632 	WINDOW *window;
633 	PANEL *panel;
634 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
635 	int resized_y, resized_x; /* begin_y/x based on user resizing */
636 	int maxx, x; /* max column and current start column */
637 	int lines, cols; /* copies of LINES and COLS */
638 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
639 	int gline, hiline; /* navigate to and highlight this nG line */
640 	int ch, count; /* current keymap and count prefix */
641 	int resized; /* set when in a resize event */
642 	int focussed; /* Only set on one parent or child view at a time. */
643 	int dying;
644 	struct tog_view *parent;
645 	struct tog_view *child;
646 
647 	/*
648 	 * This flag is initially set on parent views when a new child view
649 	 * is created. It gets toggled when the 'Tab' key switches focus
650 	 * between parent and child.
651 	 * The flag indicates whether focus should be passed on to our child
652 	 * view if this parent view gets picked for focus after another parent
653 	 * view was closed. This prevents child views from losing focus in such
654 	 * situations.
655 	 */
656 	int focus_child;
657 
658 	enum tog_view_mode mode;
659 	/* type-specific state */
660 	enum tog_view_type type;
661 	union {
662 		struct tog_diff_view_state diff;
663 		struct tog_log_view_state log;
664 		struct tog_blame_view_state blame;
665 		struct tog_tree_view_state tree;
666 		struct tog_ref_view_state ref;
667 		struct tog_help_view_state help;
668 	} state;
669 
670 	const struct got_error *(*show)(struct tog_view *);
671 	const struct got_error *(*input)(struct tog_view **,
672 	    struct tog_view *, int);
673 	const struct got_error *(*reset)(struct tog_view *);
674 	const struct got_error *(*resize)(struct tog_view *, int);
675 	const struct got_error *(*close)(struct tog_view *);
676 
677 	const struct got_error *(*search_start)(struct tog_view *);
678 	const struct got_error *(*search_next)(struct tog_view *);
679 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
680 	    int **, int **, int **, int **);
681 	int search_started;
682 	int searching;
683 #define TOG_SEARCH_FORWARD	1
684 #define TOG_SEARCH_BACKWARD	2
685 	int search_next_done;
686 #define TOG_SEARCH_HAVE_MORE	1
687 #define TOG_SEARCH_NO_MORE	2
688 #define TOG_SEARCH_HAVE_NONE	3
689 	regex_t regex;
690 	regmatch_t regmatch;
691 };
692 
693 static const struct got_error *open_diff_view(struct tog_view *,
694     struct got_object_id *, struct got_object_id *,
695     const char *, const char *, int, int, int, struct tog_view *,
696     struct got_repository *);
697 static const struct got_error *show_diff_view(struct tog_view *);
698 static const struct got_error *input_diff_view(struct tog_view **,
699     struct tog_view *, int);
700 static const struct got_error *reset_diff_view(struct tog_view *);
701 static const struct got_error* close_diff_view(struct tog_view *);
702 static const struct got_error *search_start_diff_view(struct tog_view *);
703 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
704     size_t *, int **, int **, int **, int **);
705 static const struct got_error *search_next_view_match(struct tog_view *);
706 
707 static const struct got_error *open_log_view(struct tog_view *,
708     struct got_object_id *, struct got_repository *,
709     const char *, const char *, int);
710 static const struct got_error * show_log_view(struct tog_view *);
711 static const struct got_error *input_log_view(struct tog_view **,
712     struct tog_view *, int);
713 static const struct got_error *resize_log_view(struct tog_view *, int);
714 static const struct got_error *close_log_view(struct tog_view *);
715 static const struct got_error *search_start_log_view(struct tog_view *);
716 static const struct got_error *search_next_log_view(struct tog_view *);
717 
718 static const struct got_error *open_blame_view(struct tog_view *, char *,
719     struct got_object_id *, struct got_repository *);
720 static const struct got_error *show_blame_view(struct tog_view *);
721 static const struct got_error *input_blame_view(struct tog_view **,
722     struct tog_view *, int);
723 static const struct got_error *reset_blame_view(struct tog_view *);
724 static const struct got_error *close_blame_view(struct tog_view *);
725 static const struct got_error *search_start_blame_view(struct tog_view *);
726 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
727     size_t *, int **, int **, int **, int **);
728 
729 static const struct got_error *open_tree_view(struct tog_view *,
730     struct got_object_id *, const char *, struct got_repository *);
731 static const struct got_error *show_tree_view(struct tog_view *);
732 static const struct got_error *input_tree_view(struct tog_view **,
733     struct tog_view *, int);
734 static const struct got_error *close_tree_view(struct tog_view *);
735 static const struct got_error *search_start_tree_view(struct tog_view *);
736 static const struct got_error *search_next_tree_view(struct tog_view *);
737 
738 static const struct got_error *open_ref_view(struct tog_view *,
739     struct got_repository *);
740 static const struct got_error *show_ref_view(struct tog_view *);
741 static const struct got_error *input_ref_view(struct tog_view **,
742     struct tog_view *, int);
743 static const struct got_error *close_ref_view(struct tog_view *);
744 static const struct got_error *search_start_ref_view(struct tog_view *);
745 static const struct got_error *search_next_ref_view(struct tog_view *);
746 
747 static const struct got_error *open_help_view(struct tog_view *,
748     struct tog_view *);
749 static const struct got_error *show_help_view(struct tog_view *);
750 static const struct got_error *input_help_view(struct tog_view **,
751     struct tog_view *, int);
752 static const struct got_error *reset_help_view(struct tog_view *);
753 static const struct got_error* close_help_view(struct tog_view *);
754 static const struct got_error *search_start_help_view(struct tog_view *);
755 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
756     size_t *, int **, int **, int **, int **);
757 
758 static volatile sig_atomic_t tog_sigwinch_received;
759 static volatile sig_atomic_t tog_sigpipe_received;
760 static volatile sig_atomic_t tog_sigcont_received;
761 static volatile sig_atomic_t tog_sigint_received;
762 static volatile sig_atomic_t tog_sigterm_received;
763 
764 static void
765 tog_sigwinch(int signo)
766 {
767 	tog_sigwinch_received = 1;
768 }
769 
770 static void
771 tog_sigpipe(int signo)
772 {
773 	tog_sigpipe_received = 1;
774 }
775 
776 static void
777 tog_sigcont(int signo)
778 {
779 	tog_sigcont_received = 1;
780 }
781 
782 static void
783 tog_sigint(int signo)
784 {
785 	tog_sigint_received = 1;
786 }
787 
788 static void
789 tog_sigterm(int signo)
790 {
791 	tog_sigterm_received = 1;
792 }
793 
794 static int
795 tog_fatal_signal_received(void)
796 {
797 	return (tog_sigpipe_received ||
798 	    tog_sigint_received || tog_sigterm_received);
799 }
800 
801 static const struct got_error *
802 view_close(struct tog_view *view)
803 {
804 	const struct got_error *err = NULL, *child_err = NULL;
805 
806 	if (view->child) {
807 		child_err = view_close(view->child);
808 		view->child = NULL;
809 	}
810 	if (view->close)
811 		err = view->close(view);
812 	if (view->panel)
813 		del_panel(view->panel);
814 	if (view->window)
815 		delwin(view->window);
816 	free(view);
817 	return err ? err : child_err;
818 }
819 
820 static struct tog_view *
821 view_open(int nlines, int ncols, int begin_y, int begin_x,
822     enum tog_view_type type)
823 {
824 	struct tog_view *view = calloc(1, sizeof(*view));
825 
826 	if (view == NULL)
827 		return NULL;
828 
829 	view->type = type;
830 	view->lines = LINES;
831 	view->cols = COLS;
832 	view->nlines = nlines ? nlines : LINES - begin_y;
833 	view->ncols = ncols ? ncols : COLS - begin_x;
834 	view->begin_y = begin_y;
835 	view->begin_x = begin_x;
836 	view->window = newwin(nlines, ncols, begin_y, begin_x);
837 	if (view->window == NULL) {
838 		view_close(view);
839 		return NULL;
840 	}
841 	view->panel = new_panel(view->window);
842 	if (view->panel == NULL ||
843 	    set_panel_userptr(view->panel, view) != OK) {
844 		view_close(view);
845 		return NULL;
846 	}
847 
848 	keypad(view->window, TRUE);
849 	return view;
850 }
851 
852 static int
853 view_split_begin_x(int begin_x)
854 {
855 	if (begin_x > 0 || COLS < 120)
856 		return 0;
857 	return (COLS - MAX(COLS / 2, 80));
858 }
859 
860 /* XXX Stub till we decide what to do. */
861 static int
862 view_split_begin_y(int lines)
863 {
864 	return lines * HSPLIT_SCALE;
865 }
866 
867 static const struct got_error *view_resize(struct tog_view *);
868 
869 static const struct got_error *
870 view_splitscreen(struct tog_view *view)
871 {
872 	const struct got_error *err = NULL;
873 
874 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
875 		if (view->resized_y && view->resized_y < view->lines)
876 			view->begin_y = view->resized_y;
877 		else
878 			view->begin_y = view_split_begin_y(view->nlines);
879 		view->begin_x = 0;
880 	} else if (!view->resized) {
881 		if (view->resized_x && view->resized_x < view->cols - 1 &&
882 		    view->cols > 119)
883 			view->begin_x = view->resized_x;
884 		else
885 			view->begin_x = view_split_begin_x(0);
886 		view->begin_y = 0;
887 	}
888 	view->nlines = LINES - view->begin_y;
889 	view->ncols = COLS - view->begin_x;
890 	view->lines = LINES;
891 	view->cols = COLS;
892 	err = view_resize(view);
893 	if (err)
894 		return err;
895 
896 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
897 		view->parent->nlines = view->begin_y;
898 
899 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
900 		return got_error_from_errno("mvwin");
901 
902 	return NULL;
903 }
904 
905 static const struct got_error *
906 view_fullscreen(struct tog_view *view)
907 {
908 	const struct got_error *err = NULL;
909 
910 	view->begin_x = 0;
911 	view->begin_y = view->resized ? view->begin_y : 0;
912 	view->nlines = view->resized ? view->nlines : LINES;
913 	view->ncols = COLS;
914 	view->lines = LINES;
915 	view->cols = COLS;
916 	err = view_resize(view);
917 	if (err)
918 		return err;
919 
920 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
921 		return got_error_from_errno("mvwin");
922 
923 	return NULL;
924 }
925 
926 static int
927 view_is_parent_view(struct tog_view *view)
928 {
929 	return view->parent == NULL;
930 }
931 
932 static int
933 view_is_splitscreen(struct tog_view *view)
934 {
935 	return view->begin_x > 0 || view->begin_y > 0;
936 }
937 
938 static int
939 view_is_fullscreen(struct tog_view *view)
940 {
941 	return view->nlines == LINES && view->ncols == COLS;
942 }
943 
944 static int
945 view_is_hsplit_top(struct tog_view *view)
946 {
947 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
948 	    view_is_splitscreen(view->child);
949 }
950 
951 static void
952 view_border(struct tog_view *view)
953 {
954 	PANEL *panel;
955 	const struct tog_view *view_above;
956 
957 	if (view->parent)
958 		return view_border(view->parent);
959 
960 	panel = panel_above(view->panel);
961 	if (panel == NULL)
962 		return;
963 
964 	view_above = panel_userptr(panel);
965 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
966 		mvwhline(view->window, view_above->begin_y - 1,
967 		    view->begin_x, got_locale_is_utf8() ?
968 		    ACS_HLINE : '-', view->ncols);
969 	else
970 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
971 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
972 }
973 
974 static const struct got_error *view_init_hsplit(struct tog_view *, int);
975 static const struct got_error *request_log_commits(struct tog_view *);
976 static const struct got_error *offset_selection_down(struct tog_view *);
977 static void offset_selection_up(struct tog_view *);
978 static void view_get_split(struct tog_view *, int *, int *);
979 
980 static const struct got_error *
981 view_resize(struct tog_view *view)
982 {
983 	const struct got_error	*err = NULL;
984 	int			 dif, nlines, ncols;
985 
986 	dif = LINES - view->lines;  /* line difference */
987 
988 	if (view->lines > LINES)
989 		nlines = view->nlines - (view->lines - LINES);
990 	else
991 		nlines = view->nlines + (LINES - view->lines);
992 	if (view->cols > COLS)
993 		ncols = view->ncols - (view->cols - COLS);
994 	else
995 		ncols = view->ncols + (COLS - view->cols);
996 
997 	if (view->child) {
998 		int hs = view->child->begin_y;
999 
1000 		if (!view_is_fullscreen(view))
1001 			view->child->begin_x = view_split_begin_x(view->begin_x);
1002 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1003 		    view->child->begin_x == 0) {
1004 			ncols = COLS;
1005 
1006 			view_fullscreen(view->child);
1007 			if (view->child->focussed)
1008 				show_panel(view->child->panel);
1009 			else
1010 				show_panel(view->panel);
1011 		} else {
1012 			ncols = view->child->begin_x;
1013 
1014 			view_splitscreen(view->child);
1015 			show_panel(view->child->panel);
1016 		}
1017 		/*
1018 		 * XXX This is ugly and needs to be moved into the above
1019 		 * logic but "works" for now and my attempts at moving it
1020 		 * break either 'tab' or 'F' key maps in horizontal splits.
1021 		 */
1022 		if (hs) {
1023 			err = view_splitscreen(view->child);
1024 			if (err)
1025 				return err;
1026 			if (dif < 0) { /* top split decreased */
1027 				err = offset_selection_down(view);
1028 				if (err)
1029 					return err;
1030 			}
1031 			view_border(view);
1032 			update_panels();
1033 			doupdate();
1034 			show_panel(view->child->panel);
1035 			nlines = view->nlines;
1036 		}
1037 	} else if (view->parent == NULL)
1038 		ncols = COLS;
1039 
1040 	if (view->resize && dif > 0) {
1041 		err = view->resize(view, dif);
1042 		if (err)
1043 			return err;
1044 	}
1045 
1046 	if (wresize(view->window, nlines, ncols) == ERR)
1047 		return got_error_from_errno("wresize");
1048 	if (replace_panel(view->panel, view->window) == ERR)
1049 		return got_error_from_errno("replace_panel");
1050 	wclear(view->window);
1051 
1052 	view->nlines = nlines;
1053 	view->ncols = ncols;
1054 	view->lines = LINES;
1055 	view->cols = COLS;
1056 
1057 	return NULL;
1058 }
1059 
1060 static const struct got_error *
1061 resize_log_view(struct tog_view *view, int increase)
1062 {
1063 	struct tog_log_view_state	*s = &view->state.log;
1064 	const struct got_error		*err = NULL;
1065 	int				 n = 0;
1066 
1067 	if (s->selected_entry)
1068 		n = s->selected_entry->idx + view->lines - s->selected;
1069 
1070 	/*
1071 	 * Request commits to account for the increased
1072 	 * height so we have enough to populate the view.
1073 	 */
1074 	if (s->commits->ncommits < n) {
1075 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1076 		err = request_log_commits(view);
1077 	}
1078 
1079 	return err;
1080 }
1081 
1082 static void
1083 view_adjust_offset(struct tog_view *view, int n)
1084 {
1085 	if (n == 0)
1086 		return;
1087 
1088 	if (view->parent && view->parent->offset) {
1089 		if (view->parent->offset + n >= 0)
1090 			view->parent->offset += n;
1091 		else
1092 			view->parent->offset = 0;
1093 	} else if (view->offset) {
1094 		if (view->offset - n >= 0)
1095 			view->offset -= n;
1096 		else
1097 			view->offset = 0;
1098 	}
1099 }
1100 
1101 static const struct got_error *
1102 view_resize_split(struct tog_view *view, int resize)
1103 {
1104 	const struct got_error	*err = NULL;
1105 	struct tog_view		*v = NULL;
1106 
1107 	if (view->parent)
1108 		v = view->parent;
1109 	else
1110 		v = view;
1111 
1112 	if (!v->child || !view_is_splitscreen(v->child))
1113 		return NULL;
1114 
1115 	v->resized = v->child->resized = resize;  /* lock for resize event */
1116 
1117 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1118 		if (v->child->resized_y)
1119 			v->child->begin_y = v->child->resized_y;
1120 		if (view->parent)
1121 			v->child->begin_y -= resize;
1122 		else
1123 			v->child->begin_y += resize;
1124 		if (v->child->begin_y < 3) {
1125 			view->count = 0;
1126 			v->child->begin_y = 3;
1127 		} else if (v->child->begin_y > LINES - 1) {
1128 			view->count = 0;
1129 			v->child->begin_y = LINES - 1;
1130 		}
1131 		v->ncols = COLS;
1132 		v->child->ncols = COLS;
1133 		view_adjust_offset(view, resize);
1134 		err = view_init_hsplit(v, v->child->begin_y);
1135 		if (err)
1136 			return err;
1137 		v->child->resized_y = v->child->begin_y;
1138 	} else {
1139 		if (v->child->resized_x)
1140 			v->child->begin_x = v->child->resized_x;
1141 		if (view->parent)
1142 			v->child->begin_x -= resize;
1143 		else
1144 			v->child->begin_x += resize;
1145 		if (v->child->begin_x < 11) {
1146 			view->count = 0;
1147 			v->child->begin_x = 11;
1148 		} else if (v->child->begin_x > COLS - 1) {
1149 			view->count = 0;
1150 			v->child->begin_x = COLS - 1;
1151 		}
1152 		v->child->resized_x = v->child->begin_x;
1153 	}
1154 
1155 	v->child->mode = v->mode;
1156 	v->child->nlines = v->lines - v->child->begin_y;
1157 	v->child->ncols = v->cols - v->child->begin_x;
1158 	v->focus_child = 1;
1159 
1160 	err = view_fullscreen(v);
1161 	if (err)
1162 		return err;
1163 	err = view_splitscreen(v->child);
1164 	if (err)
1165 		return err;
1166 
1167 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1168 		err = offset_selection_down(v->child);
1169 		if (err)
1170 			return err;
1171 	}
1172 
1173 	if (v->resize)
1174 		err = v->resize(v, 0);
1175 	else if (v->child->resize)
1176 		err = v->child->resize(v->child, 0);
1177 
1178 	v->resized = v->child->resized = 0;
1179 
1180 	return err;
1181 }
1182 
1183 static void
1184 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1185 {
1186 	struct tog_view *v = src->child ? src->child : src;
1187 
1188 	dst->resized_x = v->resized_x;
1189 	dst->resized_y = v->resized_y;
1190 }
1191 
1192 static const struct got_error *
1193 view_close_child(struct tog_view *view)
1194 {
1195 	const struct got_error *err = NULL;
1196 
1197 	if (view->child == NULL)
1198 		return NULL;
1199 
1200 	err = view_close(view->child);
1201 	view->child = NULL;
1202 	return err;
1203 }
1204 
1205 static const struct got_error *
1206 view_set_child(struct tog_view *view, struct tog_view *child)
1207 {
1208 	const struct got_error *err = NULL;
1209 
1210 	view->child = child;
1211 	child->parent = view;
1212 
1213 	err = view_resize(view);
1214 	if (err)
1215 		return err;
1216 
1217 	if (view->child->resized_x || view->child->resized_y)
1218 		err = view_resize_split(view, 0);
1219 
1220 	return err;
1221 }
1222 
1223 static const struct got_error *view_dispatch_request(struct tog_view **,
1224     struct tog_view *, enum tog_view_type, int, int);
1225 
1226 static const struct got_error *
1227 view_request_new(struct tog_view **requested, struct tog_view *view,
1228     enum tog_view_type request)
1229 {
1230 	struct tog_view		*new_view = NULL;
1231 	const struct got_error	*err;
1232 	int			 y = 0, x = 0;
1233 
1234 	*requested = NULL;
1235 
1236 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1237 		view_get_split(view, &y, &x);
1238 
1239 	err = view_dispatch_request(&new_view, view, request, y, x);
1240 	if (err)
1241 		return err;
1242 
1243 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1244 	    request != TOG_VIEW_HELP) {
1245 		err = view_init_hsplit(view, y);
1246 		if (err)
1247 			return err;
1248 	}
1249 
1250 	view->focussed = 0;
1251 	new_view->focussed = 1;
1252 	new_view->mode = view->mode;
1253 	new_view->nlines = request == TOG_VIEW_HELP ?
1254 	    view->lines : view->lines - y;
1255 
1256 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1257 		view_transfer_size(new_view, view);
1258 		err = view_close_child(view);
1259 		if (err)
1260 			return err;
1261 		err = view_set_child(view, new_view);
1262 		if (err)
1263 			return err;
1264 		view->focus_child = 1;
1265 	} else
1266 		*requested = new_view;
1267 
1268 	return NULL;
1269 }
1270 
1271 static void
1272 tog_resizeterm(void)
1273 {
1274 	int cols, lines;
1275 	struct winsize size;
1276 
1277 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1278 		cols = 80;     /* Default */
1279 		lines = 24;
1280 	} else {
1281 		cols = size.ws_col;
1282 		lines = size.ws_row;
1283 	}
1284 	resize_term(lines, cols);
1285 }
1286 
1287 static const struct got_error *
1288 view_search_start(struct tog_view *view)
1289 {
1290 	const struct got_error *err = NULL;
1291 	struct tog_view *v = view;
1292 	char pattern[1024];
1293 	int ret;
1294 
1295 	if (view->search_started) {
1296 		regfree(&view->regex);
1297 		view->searching = 0;
1298 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1299 	}
1300 	view->search_started = 0;
1301 
1302 	if (view->nlines < 1)
1303 		return NULL;
1304 
1305 	if (view_is_hsplit_top(view))
1306 		v = view->child;
1307 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1308 		v = view->parent;
1309 
1310 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1311 	wclrtoeol(v->window);
1312 
1313 	nodelay(v->window, FALSE);  /* block for search term input */
1314 	nocbreak();
1315 	echo();
1316 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1317 	wrefresh(v->window);
1318 	cbreak();
1319 	noecho();
1320 	nodelay(v->window, TRUE);
1321 	if (ret == ERR)
1322 		return NULL;
1323 
1324 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1325 		err = view->search_start(view);
1326 		if (err) {
1327 			regfree(&view->regex);
1328 			return err;
1329 		}
1330 		view->search_started = 1;
1331 		view->searching = TOG_SEARCH_FORWARD;
1332 		view->search_next_done = 0;
1333 		view->search_next(view);
1334 	}
1335 
1336 	return NULL;
1337 }
1338 
1339 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1340 static const struct got_error *
1341 switch_split(struct tog_view *view)
1342 {
1343 	const struct got_error	*err = NULL;
1344 	struct tog_view		*v = NULL;
1345 
1346 	if (view->parent)
1347 		v = view->parent;
1348 	else
1349 		v = view;
1350 
1351 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1352 		v->mode = TOG_VIEW_SPLIT_VERT;
1353 	else
1354 		v->mode = TOG_VIEW_SPLIT_HRZN;
1355 
1356 	if (!v->child)
1357 		return NULL;
1358 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1359 		v->mode = TOG_VIEW_SPLIT_NONE;
1360 
1361 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1362 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1363 		v->child->begin_y = v->child->resized_y;
1364 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1365 		v->child->begin_x = v->child->resized_x;
1366 
1367 
1368 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1369 		v->ncols = COLS;
1370 		v->child->ncols = COLS;
1371 		v->child->nscrolled = LINES - v->child->nlines;
1372 
1373 		err = view_init_hsplit(v, v->child->begin_y);
1374 		if (err)
1375 			return err;
1376 	}
1377 	v->child->mode = v->mode;
1378 	v->child->nlines = v->lines - v->child->begin_y;
1379 	v->focus_child = 1;
1380 
1381 	err = view_fullscreen(v);
1382 	if (err)
1383 		return err;
1384 	err = view_splitscreen(v->child);
1385 	if (err)
1386 		return err;
1387 
1388 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1389 		v->mode = TOG_VIEW_SPLIT_VERT;
1390 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1391 		err = offset_selection_down(v);
1392 		if (err)
1393 			return err;
1394 		err = offset_selection_down(v->child);
1395 		if (err)
1396 			return err;
1397 	} else {
1398 		offset_selection_up(v);
1399 		offset_selection_up(v->child);
1400 	}
1401 	if (v->resize)
1402 		err = v->resize(v, 0);
1403 	else if (v->child->resize)
1404 		err = v->child->resize(v->child, 0);
1405 
1406 	return err;
1407 }
1408 
1409 /*
1410  * Compute view->count from numeric input. Assign total to view->count and
1411  * return first non-numeric key entered.
1412  */
1413 static int
1414 get_compound_key(struct tog_view *view, int c)
1415 {
1416 	struct tog_view	*v = view;
1417 	int		 x, n = 0;
1418 
1419 	if (view_is_hsplit_top(view))
1420 		v = view->child;
1421 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1422 		v = view->parent;
1423 
1424 	view->count = 0;
1425 	cbreak();  /* block for input */
1426 	nodelay(view->window, FALSE);
1427 	wmove(v->window, v->nlines - 1, 0);
1428 	wclrtoeol(v->window);
1429 	waddch(v->window, ':');
1430 
1431 	do {
1432 		x = getcurx(v->window);
1433 		if (x != ERR && x < view->ncols) {
1434 			waddch(v->window, c);
1435 			wrefresh(v->window);
1436 		}
1437 
1438 		/*
1439 		 * Don't overflow. Max valid request should be the greatest
1440 		 * between the longest and total lines; cap at 10 million.
1441 		 */
1442 		if (n >= 9999999)
1443 			n = 9999999;
1444 		else
1445 			n = n * 10 + (c - '0');
1446 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1447 
1448 	if (c == 'G' || c == 'g') {	/* nG key map */
1449 		view->gline = view->hiline = n;
1450 		n = 0;
1451 		c = 0;
1452 	}
1453 
1454 	/* Massage excessive or inapplicable values at the input handler. */
1455 	view->count = n;
1456 
1457 	return c;
1458 }
1459 
1460 static const struct got_error *
1461 view_input(struct tog_view **new, int *done, struct tog_view *view,
1462     struct tog_view_list_head *views)
1463 {
1464 	const struct got_error *err = NULL;
1465 	struct tog_view *v;
1466 	int ch, errcode;
1467 
1468 	*new = NULL;
1469 
1470 	/* Clear "no matches" indicator. */
1471 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1472 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1473 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1474 		view->count = 0;
1475 	}
1476 
1477 	if (view->searching && !view->search_next_done) {
1478 		errcode = pthread_mutex_unlock(&tog_mutex);
1479 		if (errcode)
1480 			return got_error_set_errno(errcode,
1481 			    "pthread_mutex_unlock");
1482 		sched_yield();
1483 		errcode = pthread_mutex_lock(&tog_mutex);
1484 		if (errcode)
1485 			return got_error_set_errno(errcode,
1486 			    "pthread_mutex_lock");
1487 		view->search_next(view);
1488 		return NULL;
1489 	}
1490 
1491 	/* Allow threads to make progress while we are waiting for input. */
1492 	errcode = pthread_mutex_unlock(&tog_mutex);
1493 	if (errcode)
1494 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1495 	/* If we have an unfinished count, let C-g or backspace abort. */
1496 	if (view->count && --view->count) {
1497 		cbreak();
1498 		nodelay(view->window, TRUE);
1499 		ch = wgetch(view->window);
1500 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1501 			view->count = 0;
1502 		else
1503 			ch = view->ch;
1504 	} else {
1505 		ch = wgetch(view->window);
1506 		if (ch >= '1' && ch  <= '9')
1507 			view->ch = ch = get_compound_key(view, ch);
1508 	}
1509 	if (view->hiline && ch != ERR && ch != 0)
1510 		view->hiline = 0;  /* key pressed, clear line highlight */
1511 	nodelay(view->window, TRUE);
1512 	errcode = pthread_mutex_lock(&tog_mutex);
1513 	if (errcode)
1514 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1515 
1516 	if (tog_sigwinch_received || tog_sigcont_received) {
1517 		tog_resizeterm();
1518 		tog_sigwinch_received = 0;
1519 		tog_sigcont_received = 0;
1520 		TAILQ_FOREACH(v, views, entry) {
1521 			err = view_resize(v);
1522 			if (err)
1523 				return err;
1524 			err = v->input(new, v, KEY_RESIZE);
1525 			if (err)
1526 				return err;
1527 			if (v->child) {
1528 				err = view_resize(v->child);
1529 				if (err)
1530 					return err;
1531 				err = v->child->input(new, v->child,
1532 				    KEY_RESIZE);
1533 				if (err)
1534 					return err;
1535 				if (v->child->resized_x || v->child->resized_y) {
1536 					err = view_resize_split(v, 0);
1537 					if (err)
1538 						return err;
1539 				}
1540 			}
1541 		}
1542 	}
1543 
1544 	switch (ch) {
1545 	case '?':
1546 	case 'H':
1547 	case KEY_F(1):
1548 		if (view->type == TOG_VIEW_HELP)
1549 			err = view->reset(view);
1550 		else
1551 			err = view_request_new(new, view, TOG_VIEW_HELP);
1552 		break;
1553 	case '\t':
1554 		view->count = 0;
1555 		if (view->child) {
1556 			view->focussed = 0;
1557 			view->child->focussed = 1;
1558 			view->focus_child = 1;
1559 		} else if (view->parent) {
1560 			view->focussed = 0;
1561 			view->parent->focussed = 1;
1562 			view->parent->focus_child = 0;
1563 			if (!view_is_splitscreen(view)) {
1564 				if (view->parent->resize) {
1565 					err = view->parent->resize(view->parent,
1566 					    0);
1567 					if (err)
1568 						return err;
1569 				}
1570 				offset_selection_up(view->parent);
1571 				err = view_fullscreen(view->parent);
1572 				if (err)
1573 					return err;
1574 			}
1575 		}
1576 		break;
1577 	case 'q':
1578 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1579 			if (view->parent->resize) {
1580 				/* might need more commits to fill fullscreen */
1581 				err = view->parent->resize(view->parent, 0);
1582 				if (err)
1583 					break;
1584 			}
1585 			offset_selection_up(view->parent);
1586 		}
1587 		err = view->input(new, view, ch);
1588 		view->dying = 1;
1589 		break;
1590 	case 'Q':
1591 		*done = 1;
1592 		break;
1593 	case 'F':
1594 		view->count = 0;
1595 		if (view_is_parent_view(view)) {
1596 			if (view->child == NULL)
1597 				break;
1598 			if (view_is_splitscreen(view->child)) {
1599 				view->focussed = 0;
1600 				view->child->focussed = 1;
1601 				err = view_fullscreen(view->child);
1602 			} else {
1603 				err = view_splitscreen(view->child);
1604 				if (!err)
1605 					err = view_resize_split(view, 0);
1606 			}
1607 			if (err)
1608 				break;
1609 			err = view->child->input(new, view->child,
1610 			    KEY_RESIZE);
1611 		} else {
1612 			if (view_is_splitscreen(view)) {
1613 				view->parent->focussed = 0;
1614 				view->focussed = 1;
1615 				err = view_fullscreen(view);
1616 			} else {
1617 				err = view_splitscreen(view);
1618 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1619 					err = view_resize(view->parent);
1620 				if (!err)
1621 					err = view_resize_split(view, 0);
1622 			}
1623 			if (err)
1624 				break;
1625 			err = view->input(new, view, KEY_RESIZE);
1626 		}
1627 		if (err)
1628 			break;
1629 		if (view->resize) {
1630 			err = view->resize(view, 0);
1631 			if (err)
1632 				break;
1633 		}
1634 		if (view->parent)
1635 			err = offset_selection_down(view->parent);
1636 		if (!err)
1637 			err = offset_selection_down(view);
1638 		break;
1639 	case 'S':
1640 		view->count = 0;
1641 		err = switch_split(view);
1642 		break;
1643 	case '-':
1644 		err = view_resize_split(view, -1);
1645 		break;
1646 	case '+':
1647 		err = view_resize_split(view, 1);
1648 		break;
1649 	case KEY_RESIZE:
1650 		break;
1651 	case '/':
1652 		view->count = 0;
1653 		if (view->search_start)
1654 			view_search_start(view);
1655 		else
1656 			err = view->input(new, view, ch);
1657 		break;
1658 	case 'N':
1659 	case 'n':
1660 		if (view->search_started && view->search_next) {
1661 			view->searching = (ch == 'n' ?
1662 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1663 			view->search_next_done = 0;
1664 			view->search_next(view);
1665 		} else
1666 			err = view->input(new, view, ch);
1667 		break;
1668 	case 'A':
1669 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1670 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1671 		else
1672 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1673 		TAILQ_FOREACH(v, views, entry) {
1674 			if (v->reset) {
1675 				err = v->reset(v);
1676 				if (err)
1677 					return err;
1678 			}
1679 			if (v->child && v->child->reset) {
1680 				err = v->child->reset(v->child);
1681 				if (err)
1682 					return err;
1683 			}
1684 		}
1685 		break;
1686 	default:
1687 		err = view->input(new, view, ch);
1688 		break;
1689 	}
1690 
1691 	return err;
1692 }
1693 
1694 static int
1695 view_needs_focus_indication(struct tog_view *view)
1696 {
1697 	if (view_is_parent_view(view)) {
1698 		if (view->child == NULL || view->child->focussed)
1699 			return 0;
1700 		if (!view_is_splitscreen(view->child))
1701 			return 0;
1702 	} else if (!view_is_splitscreen(view))
1703 		return 0;
1704 
1705 	return view->focussed;
1706 }
1707 
1708 static const struct got_error *
1709 view_loop(struct tog_view *view)
1710 {
1711 	const struct got_error *err = NULL;
1712 	struct tog_view_list_head views;
1713 	struct tog_view *new_view;
1714 	char *mode;
1715 	int fast_refresh = 10;
1716 	int done = 0, errcode;
1717 
1718 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1719 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1720 		view->mode = TOG_VIEW_SPLIT_VERT;
1721 	else
1722 		view->mode = TOG_VIEW_SPLIT_HRZN;
1723 
1724 	errcode = pthread_mutex_lock(&tog_mutex);
1725 	if (errcode)
1726 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1727 
1728 	TAILQ_INIT(&views);
1729 	TAILQ_INSERT_HEAD(&views, view, entry);
1730 
1731 	view->focussed = 1;
1732 	err = view->show(view);
1733 	if (err)
1734 		return err;
1735 	update_panels();
1736 	doupdate();
1737 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1738 	    !tog_fatal_signal_received()) {
1739 		/* Refresh fast during initialization, then become slower. */
1740 		if (fast_refresh && fast_refresh-- == 0)
1741 			halfdelay(10); /* switch to once per second */
1742 
1743 		err = view_input(&new_view, &done, view, &views);
1744 		if (err)
1745 			break;
1746 		if (view->dying) {
1747 			struct tog_view *v, *prev = NULL;
1748 
1749 			if (view_is_parent_view(view))
1750 				prev = TAILQ_PREV(view, tog_view_list_head,
1751 				    entry);
1752 			else if (view->parent)
1753 				prev = view->parent;
1754 
1755 			if (view->parent) {
1756 				view->parent->child = NULL;
1757 				view->parent->focus_child = 0;
1758 				/* Restore fullscreen line height. */
1759 				view->parent->nlines = view->parent->lines;
1760 				err = view_resize(view->parent);
1761 				if (err)
1762 					break;
1763 				/* Make resized splits persist. */
1764 				view_transfer_size(view->parent, view);
1765 			} else
1766 				TAILQ_REMOVE(&views, view, entry);
1767 
1768 			err = view_close(view);
1769 			if (err)
1770 				goto done;
1771 
1772 			view = NULL;
1773 			TAILQ_FOREACH(v, &views, entry) {
1774 				if (v->focussed)
1775 					break;
1776 			}
1777 			if (view == NULL && new_view == NULL) {
1778 				/* No view has focus. Try to pick one. */
1779 				if (prev)
1780 					view = prev;
1781 				else if (!TAILQ_EMPTY(&views)) {
1782 					view = TAILQ_LAST(&views,
1783 					    tog_view_list_head);
1784 				}
1785 				if (view) {
1786 					if (view->focus_child) {
1787 						view->child->focussed = 1;
1788 						view = view->child;
1789 					} else
1790 						view->focussed = 1;
1791 				}
1792 			}
1793 		}
1794 		if (new_view) {
1795 			struct tog_view *v, *t;
1796 			/* Only allow one parent view per type. */
1797 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1798 				if (v->type != new_view->type)
1799 					continue;
1800 				TAILQ_REMOVE(&views, v, entry);
1801 				err = view_close(v);
1802 				if (err)
1803 					goto done;
1804 				break;
1805 			}
1806 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1807 			view = new_view;
1808 		}
1809 		if (view) {
1810 			if (view_is_parent_view(view)) {
1811 				if (view->child && view->child->focussed)
1812 					view = view->child;
1813 			} else {
1814 				if (view->parent && view->parent->focussed)
1815 					view = view->parent;
1816 			}
1817 			show_panel(view->panel);
1818 			if (view->child && view_is_splitscreen(view->child))
1819 				show_panel(view->child->panel);
1820 			if (view->parent && view_is_splitscreen(view)) {
1821 				err = view->parent->show(view->parent);
1822 				if (err)
1823 					goto done;
1824 			}
1825 			err = view->show(view);
1826 			if (err)
1827 				goto done;
1828 			if (view->child) {
1829 				err = view->child->show(view->child);
1830 				if (err)
1831 					goto done;
1832 			}
1833 			update_panels();
1834 			doupdate();
1835 		}
1836 	}
1837 done:
1838 	while (!TAILQ_EMPTY(&views)) {
1839 		const struct got_error *close_err;
1840 		view = TAILQ_FIRST(&views);
1841 		TAILQ_REMOVE(&views, view, entry);
1842 		close_err = view_close(view);
1843 		if (close_err && err == NULL)
1844 			err = close_err;
1845 	}
1846 
1847 	errcode = pthread_mutex_unlock(&tog_mutex);
1848 	if (errcode && err == NULL)
1849 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1850 
1851 	return err;
1852 }
1853 
1854 __dead static void
1855 usage_log(void)
1856 {
1857 	endwin();
1858 	fprintf(stderr,
1859 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1860 	    getprogname());
1861 	exit(1);
1862 }
1863 
1864 /* Create newly allocated wide-character string equivalent to a byte string. */
1865 static const struct got_error *
1866 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1867 {
1868 	char *vis = NULL;
1869 	const struct got_error *err = NULL;
1870 
1871 	*ws = NULL;
1872 	*wlen = mbstowcs(NULL, s, 0);
1873 	if (*wlen == (size_t)-1) {
1874 		int vislen;
1875 		if (errno != EILSEQ)
1876 			return got_error_from_errno("mbstowcs");
1877 
1878 		/* byte string invalid in current encoding; try to "fix" it */
1879 		err = got_mbsavis(&vis, &vislen, s);
1880 		if (err)
1881 			return err;
1882 		*wlen = mbstowcs(NULL, vis, 0);
1883 		if (*wlen == (size_t)-1) {
1884 			err = got_error_from_errno("mbstowcs"); /* give up */
1885 			goto done;
1886 		}
1887 	}
1888 
1889 	*ws = calloc(*wlen + 1, sizeof(**ws));
1890 	if (*ws == NULL) {
1891 		err = got_error_from_errno("calloc");
1892 		goto done;
1893 	}
1894 
1895 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1896 		err = got_error_from_errno("mbstowcs");
1897 done:
1898 	free(vis);
1899 	if (err) {
1900 		free(*ws);
1901 		*ws = NULL;
1902 		*wlen = 0;
1903 	}
1904 	return err;
1905 }
1906 
1907 static const struct got_error *
1908 expand_tab(char **ptr, const char *src)
1909 {
1910 	char	*dst;
1911 	size_t	 len, n, idx = 0, sz = 0;
1912 
1913 	*ptr = NULL;
1914 	n = len = strlen(src);
1915 	dst = malloc(n + 1);
1916 	if (dst == NULL)
1917 		return got_error_from_errno("malloc");
1918 
1919 	while (idx < len && src[idx]) {
1920 		const char c = src[idx];
1921 
1922 		if (c == '\t') {
1923 			size_t nb = TABSIZE - sz % TABSIZE;
1924 			char *p;
1925 
1926 			p = realloc(dst, n + nb);
1927 			if (p == NULL) {
1928 				free(dst);
1929 				return got_error_from_errno("realloc");
1930 
1931 			}
1932 			dst = p;
1933 			n += nb;
1934 			memset(dst + sz, ' ', nb);
1935 			sz += nb;
1936 		} else
1937 			dst[sz++] = src[idx];
1938 		++idx;
1939 	}
1940 
1941 	dst[sz] = '\0';
1942 	*ptr = dst;
1943 	return NULL;
1944 }
1945 
1946 /*
1947  * Advance at most n columns from wline starting at offset off.
1948  * Return the index to the first character after the span operation.
1949  * Return the combined column width of all spanned wide character in
1950  * *rcol.
1951  */
1952 static int
1953 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1954 {
1955 	int width, i, cols = 0;
1956 
1957 	if (n == 0) {
1958 		*rcol = cols;
1959 		return off;
1960 	}
1961 
1962 	for (i = off; wline[i] != L'\0'; ++i) {
1963 		if (wline[i] == L'\t')
1964 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1965 		else
1966 			width = wcwidth(wline[i]);
1967 
1968 		if (width == -1) {
1969 			width = 1;
1970 			wline[i] = L'.';
1971 		}
1972 
1973 		if (cols + width > n)
1974 			break;
1975 		cols += width;
1976 	}
1977 
1978 	*rcol = cols;
1979 	return i;
1980 }
1981 
1982 /*
1983  * Format a line for display, ensuring that it won't overflow a width limit.
1984  * With scrolling, the width returned refers to the scrolled version of the
1985  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1986  */
1987 static const struct got_error *
1988 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1989     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1990 {
1991 	const struct got_error *err = NULL;
1992 	int cols;
1993 	wchar_t *wline = NULL;
1994 	char *exstr = NULL;
1995 	size_t wlen;
1996 	int i, scrollx;
1997 
1998 	*wlinep = NULL;
1999 	*widthp = 0;
2000 
2001 	if (expand) {
2002 		err = expand_tab(&exstr, line);
2003 		if (err)
2004 			return err;
2005 	}
2006 
2007 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2008 	free(exstr);
2009 	if (err)
2010 		return err;
2011 
2012 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2013 
2014 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2015 		wline[wlen - 1] = L'\0';
2016 		wlen--;
2017 	}
2018 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2019 		wline[wlen - 1] = L'\0';
2020 		wlen--;
2021 	}
2022 
2023 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2024 	wline[i] = L'\0';
2025 
2026 	if (widthp)
2027 		*widthp = cols;
2028 	if (scrollxp)
2029 		*scrollxp = scrollx;
2030 	if (err)
2031 		free(wline);
2032 	else
2033 		*wlinep = wline;
2034 	return err;
2035 }
2036 
2037 static const struct got_error*
2038 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2039     struct got_object_id *id, struct got_repository *repo)
2040 {
2041 	static const struct got_error *err = NULL;
2042 	struct got_reflist_entry *re;
2043 	char *s;
2044 	const char *name;
2045 
2046 	*refs_str = NULL;
2047 
2048 	TAILQ_FOREACH(re, refs, entry) {
2049 		struct got_tag_object *tag = NULL;
2050 		struct got_object_id *ref_id;
2051 		int cmp;
2052 
2053 		name = got_ref_get_name(re->ref);
2054 		if (strcmp(name, GOT_REF_HEAD) == 0)
2055 			continue;
2056 		if (strncmp(name, "refs/", 5) == 0)
2057 			name += 5;
2058 		if (strncmp(name, "got/", 4) == 0 &&
2059 		    strncmp(name, "got/backup/", 11) != 0)
2060 			continue;
2061 		if (strncmp(name, "heads/", 6) == 0)
2062 			name += 6;
2063 		if (strncmp(name, "remotes/", 8) == 0) {
2064 			name += 8;
2065 			s = strstr(name, "/" GOT_REF_HEAD);
2066 			if (s != NULL && s[strlen(s)] == '\0')
2067 				continue;
2068 		}
2069 		err = got_ref_resolve(&ref_id, repo, re->ref);
2070 		if (err)
2071 			break;
2072 		if (strncmp(name, "tags/", 5) == 0) {
2073 			err = got_object_open_as_tag(&tag, repo, ref_id);
2074 			if (err) {
2075 				if (err->code != GOT_ERR_OBJ_TYPE) {
2076 					free(ref_id);
2077 					break;
2078 				}
2079 				/* Ref points at something other than a tag. */
2080 				err = NULL;
2081 				tag = NULL;
2082 			}
2083 		}
2084 		cmp = got_object_id_cmp(tag ?
2085 		    got_object_tag_get_object_id(tag) : ref_id, id);
2086 		free(ref_id);
2087 		if (tag)
2088 			got_object_tag_close(tag);
2089 		if (cmp != 0)
2090 			continue;
2091 		s = *refs_str;
2092 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2093 		    s ? ", " : "", name) == -1) {
2094 			err = got_error_from_errno("asprintf");
2095 			free(s);
2096 			*refs_str = NULL;
2097 			break;
2098 		}
2099 		free(s);
2100 	}
2101 
2102 	return err;
2103 }
2104 
2105 static const struct got_error *
2106 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2107     int col_tab_align)
2108 {
2109 	char *smallerthan;
2110 
2111 	smallerthan = strchr(author, '<');
2112 	if (smallerthan && smallerthan[1] != '\0')
2113 		author = smallerthan + 1;
2114 	author[strcspn(author, "@>")] = '\0';
2115 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2116 	    col_tab_align, 0);
2117 }
2118 
2119 static const struct got_error *
2120 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2121     struct got_object_id *id, const size_t date_display_cols,
2122     int author_display_cols)
2123 {
2124 	struct tog_log_view_state *s = &view->state.log;
2125 	const struct got_error *err = NULL;
2126 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2127 	char *logmsg0 = NULL, *logmsg = NULL;
2128 	char *author = NULL;
2129 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2130 	int author_width, logmsg_width;
2131 	char *newline, *line = NULL;
2132 	int col, limit, scrollx;
2133 	const int avail = view->ncols;
2134 	struct tm tm;
2135 	time_t committer_time;
2136 	struct tog_color *tc;
2137 
2138 	committer_time = got_object_commit_get_committer_time(commit);
2139 	if (gmtime_r(&committer_time, &tm) == NULL)
2140 		return got_error_from_errno("gmtime_r");
2141 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2142 		return got_error(GOT_ERR_NO_SPACE);
2143 
2144 	if (avail <= date_display_cols)
2145 		limit = MIN(sizeof(datebuf) - 1, avail);
2146 	else
2147 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2148 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2149 	if (tc)
2150 		wattr_on(view->window,
2151 		    COLOR_PAIR(tc->colorpair), NULL);
2152 	waddnstr(view->window, datebuf, limit);
2153 	if (tc)
2154 		wattr_off(view->window,
2155 		    COLOR_PAIR(tc->colorpair), NULL);
2156 	col = limit;
2157 	if (col > avail)
2158 		goto done;
2159 
2160 	if (avail >= 120) {
2161 		char *id_str;
2162 		err = got_object_id_str(&id_str, id);
2163 		if (err)
2164 			goto done;
2165 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2166 		if (tc)
2167 			wattr_on(view->window,
2168 			    COLOR_PAIR(tc->colorpair), NULL);
2169 		wprintw(view->window, "%.8s ", id_str);
2170 		if (tc)
2171 			wattr_off(view->window,
2172 			    COLOR_PAIR(tc->colorpair), NULL);
2173 		free(id_str);
2174 		col += 9;
2175 		if (col > avail)
2176 			goto done;
2177 	}
2178 
2179 	if (s->use_committer)
2180 		author = strdup(got_object_commit_get_committer(commit));
2181 	else
2182 		author = strdup(got_object_commit_get_author(commit));
2183 	if (author == NULL) {
2184 		err = got_error_from_errno("strdup");
2185 		goto done;
2186 	}
2187 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2188 	if (err)
2189 		goto done;
2190 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2191 	if (tc)
2192 		wattr_on(view->window,
2193 		    COLOR_PAIR(tc->colorpair), NULL);
2194 	waddwstr(view->window, wauthor);
2195 	col += author_width;
2196 	while (col < avail && author_width < author_display_cols + 2) {
2197 		waddch(view->window, ' ');
2198 		col++;
2199 		author_width++;
2200 	}
2201 	if (tc)
2202 		wattr_off(view->window,
2203 		    COLOR_PAIR(tc->colorpair), NULL);
2204 	if (col > avail)
2205 		goto done;
2206 
2207 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2208 	if (err)
2209 		goto done;
2210 	logmsg = logmsg0;
2211 	while (*logmsg == '\n')
2212 		logmsg++;
2213 	newline = strchr(logmsg, '\n');
2214 	if (newline)
2215 		*newline = '\0';
2216 	limit = avail - col;
2217 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2218 		limit--;	/* for the border */
2219 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2220 	    limit, col, 1);
2221 	if (err)
2222 		goto done;
2223 	waddwstr(view->window, &wlogmsg[scrollx]);
2224 	col += MAX(logmsg_width, 0);
2225 	while (col < avail) {
2226 		waddch(view->window, ' ');
2227 		col++;
2228 	}
2229 done:
2230 	free(logmsg0);
2231 	free(wlogmsg);
2232 	free(author);
2233 	free(wauthor);
2234 	free(line);
2235 	return err;
2236 }
2237 
2238 static struct commit_queue_entry *
2239 alloc_commit_queue_entry(struct got_commit_object *commit,
2240     struct got_object_id *id)
2241 {
2242 	struct commit_queue_entry *entry;
2243 	struct got_object_id *dup;
2244 
2245 	entry = calloc(1, sizeof(*entry));
2246 	if (entry == NULL)
2247 		return NULL;
2248 
2249 	dup = got_object_id_dup(id);
2250 	if (dup == NULL) {
2251 		free(entry);
2252 		return NULL;
2253 	}
2254 
2255 	entry->id = dup;
2256 	entry->commit = commit;
2257 	return entry;
2258 }
2259 
2260 static void
2261 pop_commit(struct commit_queue *commits)
2262 {
2263 	struct commit_queue_entry *entry;
2264 
2265 	entry = TAILQ_FIRST(&commits->head);
2266 	TAILQ_REMOVE(&commits->head, entry, entry);
2267 	got_object_commit_close(entry->commit);
2268 	commits->ncommits--;
2269 	free(entry->id);
2270 	free(entry);
2271 }
2272 
2273 static void
2274 free_commits(struct commit_queue *commits)
2275 {
2276 	while (!TAILQ_EMPTY(&commits->head))
2277 		pop_commit(commits);
2278 }
2279 
2280 static const struct got_error *
2281 match_commit(int *have_match, struct got_object_id *id,
2282     struct got_commit_object *commit, regex_t *regex)
2283 {
2284 	const struct got_error *err = NULL;
2285 	regmatch_t regmatch;
2286 	char *id_str = NULL, *logmsg = NULL;
2287 
2288 	*have_match = 0;
2289 
2290 	err = got_object_id_str(&id_str, id);
2291 	if (err)
2292 		return err;
2293 
2294 	err = got_object_commit_get_logmsg(&logmsg, commit);
2295 	if (err)
2296 		goto done;
2297 
2298 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2299 	    &regmatch, 0) == 0 ||
2300 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2301 	    &regmatch, 0) == 0 ||
2302 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2303 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2304 		*have_match = 1;
2305 done:
2306 	free(id_str);
2307 	free(logmsg);
2308 	return err;
2309 }
2310 
2311 static const struct got_error *
2312 queue_commits(struct tog_log_thread_args *a)
2313 {
2314 	const struct got_error *err = NULL;
2315 
2316 	/*
2317 	 * We keep all commits open throughout the lifetime of the log
2318 	 * view in order to avoid having to re-fetch commits from disk
2319 	 * while updating the display.
2320 	 */
2321 	do {
2322 		struct got_object_id id;
2323 		struct got_commit_object *commit;
2324 		struct commit_queue_entry *entry;
2325 		int limit_match = 0;
2326 		int errcode;
2327 
2328 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2329 		    NULL, NULL);
2330 		if (err)
2331 			break;
2332 
2333 		err = got_object_open_as_commit(&commit, a->repo, &id);
2334 		if (err)
2335 			break;
2336 		entry = alloc_commit_queue_entry(commit, &id);
2337 		if (entry == NULL) {
2338 			err = got_error_from_errno("alloc_commit_queue_entry");
2339 			break;
2340 		}
2341 
2342 		errcode = pthread_mutex_lock(&tog_mutex);
2343 		if (errcode) {
2344 			err = got_error_set_errno(errcode,
2345 			    "pthread_mutex_lock");
2346 			break;
2347 		}
2348 
2349 		entry->idx = a->real_commits->ncommits;
2350 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2351 		a->real_commits->ncommits++;
2352 
2353 		if (*a->limiting) {
2354 			err = match_commit(&limit_match, &id, commit,
2355 			    a->limit_regex);
2356 			if (err)
2357 				break;
2358 
2359 			if (limit_match) {
2360 				struct commit_queue_entry *matched;
2361 
2362 				matched = alloc_commit_queue_entry(
2363 				    entry->commit, entry->id);
2364 				if (matched == NULL) {
2365 					err = got_error_from_errno(
2366 					    "alloc_commit_queue_entry");
2367 					break;
2368 				}
2369 				matched->commit = entry->commit;
2370 				got_object_commit_retain(entry->commit);
2371 
2372 				matched->idx = a->limit_commits->ncommits;
2373 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2374 				    matched, entry);
2375 				a->limit_commits->ncommits++;
2376 			}
2377 
2378 			/*
2379 			 * This is how we signal log_thread() that we
2380 			 * have found a match, and that it should be
2381 			 * counted as a new entry for the view.
2382 			 */
2383 			a->limit_match = limit_match;
2384 		}
2385 
2386 		if (*a->searching == TOG_SEARCH_FORWARD &&
2387 		    !*a->search_next_done) {
2388 			int have_match;
2389 			err = match_commit(&have_match, &id, commit, a->regex);
2390 			if (err)
2391 				break;
2392 
2393 			if (*a->limiting) {
2394 				if (limit_match && have_match)
2395 					*a->search_next_done =
2396 					    TOG_SEARCH_HAVE_MORE;
2397 			} else if (have_match)
2398 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2399 		}
2400 
2401 		errcode = pthread_mutex_unlock(&tog_mutex);
2402 		if (errcode && err == NULL)
2403 			err = got_error_set_errno(errcode,
2404 			    "pthread_mutex_unlock");
2405 		if (err)
2406 			break;
2407 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2408 
2409 	return err;
2410 }
2411 
2412 static void
2413 select_commit(struct tog_log_view_state *s)
2414 {
2415 	struct commit_queue_entry *entry;
2416 	int ncommits = 0;
2417 
2418 	entry = s->first_displayed_entry;
2419 	while (entry) {
2420 		if (ncommits == s->selected) {
2421 			s->selected_entry = entry;
2422 			break;
2423 		}
2424 		entry = TAILQ_NEXT(entry, entry);
2425 		ncommits++;
2426 	}
2427 }
2428 
2429 static const struct got_error *
2430 draw_commits(struct tog_view *view)
2431 {
2432 	const struct got_error *err = NULL;
2433 	struct tog_log_view_state *s = &view->state.log;
2434 	struct commit_queue_entry *entry = s->selected_entry;
2435 	int limit = view->nlines;
2436 	int width;
2437 	int ncommits, author_cols = 4;
2438 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2439 	char *refs_str = NULL;
2440 	wchar_t *wline;
2441 	struct tog_color *tc;
2442 	static const size_t date_display_cols = 12;
2443 
2444 	if (view_is_hsplit_top(view))
2445 		--limit;  /* account for border */
2446 
2447 	if (s->selected_entry &&
2448 	    !(view->searching && view->search_next_done == 0)) {
2449 		struct got_reflist_head *refs;
2450 		err = got_object_id_str(&id_str, s->selected_entry->id);
2451 		if (err)
2452 			return err;
2453 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2454 		    s->selected_entry->id);
2455 		if (refs) {
2456 			err = build_refs_str(&refs_str, refs,
2457 			    s->selected_entry->id, s->repo);
2458 			if (err)
2459 				goto done;
2460 		}
2461 	}
2462 
2463 	if (s->thread_args.commits_needed == 0)
2464 		halfdelay(10); /* disable fast refresh */
2465 
2466 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2467 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2468 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2469 		    (view->searching && !view->search_next_done) ?
2470 		    "searching..." : "loading...") == -1) {
2471 			err = got_error_from_errno("asprintf");
2472 			goto done;
2473 		}
2474 	} else {
2475 		const char *search_str = NULL;
2476 		const char *limit_str = NULL;
2477 
2478 		if (view->searching) {
2479 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2480 				search_str = "no more matches";
2481 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2482 				search_str = "no matches found";
2483 			else if (!view->search_next_done)
2484 				search_str = "searching...";
2485 		}
2486 
2487 		if (s->limit_view && s->commits->ncommits == 0)
2488 			limit_str = "no matches found";
2489 
2490 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2491 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2492 		    search_str ? search_str : (refs_str ? refs_str : ""),
2493 		    limit_str ? limit_str : "") == -1) {
2494 			err = got_error_from_errno("asprintf");
2495 			goto done;
2496 		}
2497 	}
2498 
2499 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2500 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2501 		    "........................................",
2502 		    s->in_repo_path, ncommits_str) == -1) {
2503 			err = got_error_from_errno("asprintf");
2504 			header = NULL;
2505 			goto done;
2506 		}
2507 	} else if (asprintf(&header, "commit %s%s",
2508 	    id_str ? id_str : "........................................",
2509 	    ncommits_str) == -1) {
2510 		err = got_error_from_errno("asprintf");
2511 		header = NULL;
2512 		goto done;
2513 	}
2514 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2515 	if (err)
2516 		goto done;
2517 
2518 	werase(view->window);
2519 
2520 	if (view_needs_focus_indication(view))
2521 		wstandout(view->window);
2522 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2523 	if (tc)
2524 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2525 	waddwstr(view->window, wline);
2526 	while (width < view->ncols) {
2527 		waddch(view->window, ' ');
2528 		width++;
2529 	}
2530 	if (tc)
2531 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2532 	if (view_needs_focus_indication(view))
2533 		wstandend(view->window);
2534 	free(wline);
2535 	if (limit <= 1)
2536 		goto done;
2537 
2538 	/* Grow author column size if necessary, and set view->maxx. */
2539 	entry = s->first_displayed_entry;
2540 	ncommits = 0;
2541 	view->maxx = 0;
2542 	while (entry) {
2543 		struct got_commit_object *c = entry->commit;
2544 		char *author, *eol, *msg, *msg0;
2545 		wchar_t *wauthor, *wmsg;
2546 		int width;
2547 		if (ncommits >= limit - 1)
2548 			break;
2549 		if (s->use_committer)
2550 			author = strdup(got_object_commit_get_committer(c));
2551 		else
2552 			author = strdup(got_object_commit_get_author(c));
2553 		if (author == NULL) {
2554 			err = got_error_from_errno("strdup");
2555 			goto done;
2556 		}
2557 		err = format_author(&wauthor, &width, author, COLS,
2558 		    date_display_cols);
2559 		if (author_cols < width)
2560 			author_cols = width;
2561 		free(wauthor);
2562 		free(author);
2563 		if (err)
2564 			goto done;
2565 		err = got_object_commit_get_logmsg(&msg0, c);
2566 		if (err)
2567 			goto done;
2568 		msg = msg0;
2569 		while (*msg == '\n')
2570 			++msg;
2571 		if ((eol = strchr(msg, '\n')))
2572 			*eol = '\0';
2573 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2574 		    date_display_cols + author_cols, 0);
2575 		if (err)
2576 			goto done;
2577 		view->maxx = MAX(view->maxx, width);
2578 		free(msg0);
2579 		free(wmsg);
2580 		ncommits++;
2581 		entry = TAILQ_NEXT(entry, entry);
2582 	}
2583 
2584 	entry = s->first_displayed_entry;
2585 	s->last_displayed_entry = s->first_displayed_entry;
2586 	ncommits = 0;
2587 	while (entry) {
2588 		if (ncommits >= limit - 1)
2589 			break;
2590 		if (ncommits == s->selected)
2591 			wstandout(view->window);
2592 		err = draw_commit(view, entry->commit, entry->id,
2593 		    date_display_cols, author_cols);
2594 		if (ncommits == s->selected)
2595 			wstandend(view->window);
2596 		if (err)
2597 			goto done;
2598 		ncommits++;
2599 		s->last_displayed_entry = entry;
2600 		entry = TAILQ_NEXT(entry, entry);
2601 	}
2602 
2603 	view_border(view);
2604 done:
2605 	free(id_str);
2606 	free(refs_str);
2607 	free(ncommits_str);
2608 	free(header);
2609 	return err;
2610 }
2611 
2612 static void
2613 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2614 {
2615 	struct commit_queue_entry *entry;
2616 	int nscrolled = 0;
2617 
2618 	entry = TAILQ_FIRST(&s->commits->head);
2619 	if (s->first_displayed_entry == entry)
2620 		return;
2621 
2622 	entry = s->first_displayed_entry;
2623 	while (entry && nscrolled < maxscroll) {
2624 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2625 		if (entry) {
2626 			s->first_displayed_entry = entry;
2627 			nscrolled++;
2628 		}
2629 	}
2630 }
2631 
2632 static const struct got_error *
2633 trigger_log_thread(struct tog_view *view, int wait)
2634 {
2635 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2636 	int errcode;
2637 
2638 	halfdelay(1); /* fast refresh while loading commits */
2639 
2640 	while (!ta->log_complete && !tog_thread_error &&
2641 	    (ta->commits_needed > 0 || ta->load_all)) {
2642 		/* Wake the log thread. */
2643 		errcode = pthread_cond_signal(&ta->need_commits);
2644 		if (errcode)
2645 			return got_error_set_errno(errcode,
2646 			    "pthread_cond_signal");
2647 
2648 		/*
2649 		 * The mutex will be released while the view loop waits
2650 		 * in wgetch(), at which time the log thread will run.
2651 		 */
2652 		if (!wait)
2653 			break;
2654 
2655 		/* Display progress update in log view. */
2656 		show_log_view(view);
2657 		update_panels();
2658 		doupdate();
2659 
2660 		/* Wait right here while next commit is being loaded. */
2661 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2662 		if (errcode)
2663 			return got_error_set_errno(errcode,
2664 			    "pthread_cond_wait");
2665 
2666 		/* Display progress update in log view. */
2667 		show_log_view(view);
2668 		update_panels();
2669 		doupdate();
2670 	}
2671 
2672 	return NULL;
2673 }
2674 
2675 static const struct got_error *
2676 request_log_commits(struct tog_view *view)
2677 {
2678 	struct tog_log_view_state	*state = &view->state.log;
2679 	const struct got_error		*err = NULL;
2680 
2681 	if (state->thread_args.log_complete)
2682 		return NULL;
2683 
2684 	state->thread_args.commits_needed += view->nscrolled;
2685 	err = trigger_log_thread(view, 1);
2686 	view->nscrolled = 0;
2687 
2688 	return err;
2689 }
2690 
2691 static const struct got_error *
2692 log_scroll_down(struct tog_view *view, int maxscroll)
2693 {
2694 	struct tog_log_view_state *s = &view->state.log;
2695 	const struct got_error *err = NULL;
2696 	struct commit_queue_entry *pentry;
2697 	int nscrolled = 0, ncommits_needed;
2698 
2699 	if (s->last_displayed_entry == NULL)
2700 		return NULL;
2701 
2702 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2703 	if (s->commits->ncommits < ncommits_needed &&
2704 	    !s->thread_args.log_complete) {
2705 		/*
2706 		 * Ask the log thread for required amount of commits.
2707 		 */
2708 		s->thread_args.commits_needed +=
2709 		    ncommits_needed - s->commits->ncommits;
2710 		err = trigger_log_thread(view, 1);
2711 		if (err)
2712 			return err;
2713 	}
2714 
2715 	do {
2716 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2717 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2718 			break;
2719 
2720 		s->last_displayed_entry = pentry ?
2721 		    pentry : s->last_displayed_entry;;
2722 
2723 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2724 		if (pentry == NULL)
2725 			break;
2726 		s->first_displayed_entry = pentry;
2727 	} while (++nscrolled < maxscroll);
2728 
2729 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2730 		view->nscrolled += nscrolled;
2731 	else
2732 		view->nscrolled = 0;
2733 
2734 	return err;
2735 }
2736 
2737 static const struct got_error *
2738 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2739     struct got_commit_object *commit, struct got_object_id *commit_id,
2740     struct tog_view *log_view, struct got_repository *repo)
2741 {
2742 	const struct got_error *err;
2743 	struct got_object_qid *parent_id;
2744 	struct tog_view *diff_view;
2745 
2746 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2747 	if (diff_view == NULL)
2748 		return got_error_from_errno("view_open");
2749 
2750 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2751 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2752 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2753 	if (err == NULL)
2754 		*new_view = diff_view;
2755 	return err;
2756 }
2757 
2758 static const struct got_error *
2759 tree_view_visit_subtree(struct tog_tree_view_state *s,
2760     struct got_tree_object *subtree)
2761 {
2762 	struct tog_parent_tree *parent;
2763 
2764 	parent = calloc(1, sizeof(*parent));
2765 	if (parent == NULL)
2766 		return got_error_from_errno("calloc");
2767 
2768 	parent->tree = s->tree;
2769 	parent->first_displayed_entry = s->first_displayed_entry;
2770 	parent->selected_entry = s->selected_entry;
2771 	parent->selected = s->selected;
2772 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2773 	s->tree = subtree;
2774 	s->selected = 0;
2775 	s->first_displayed_entry = NULL;
2776 	return NULL;
2777 }
2778 
2779 static const struct got_error *
2780 tree_view_walk_path(struct tog_tree_view_state *s,
2781     struct got_commit_object *commit, const char *path)
2782 {
2783 	const struct got_error *err = NULL;
2784 	struct got_tree_object *tree = NULL;
2785 	const char *p;
2786 	char *slash, *subpath = NULL;
2787 
2788 	/* Walk the path and open corresponding tree objects. */
2789 	p = path;
2790 	while (*p) {
2791 		struct got_tree_entry *te;
2792 		struct got_object_id *tree_id;
2793 		char *te_name;
2794 
2795 		while (p[0] == '/')
2796 			p++;
2797 
2798 		/* Ensure the correct subtree entry is selected. */
2799 		slash = strchr(p, '/');
2800 		if (slash == NULL)
2801 			te_name = strdup(p);
2802 		else
2803 			te_name = strndup(p, slash - p);
2804 		if (te_name == NULL) {
2805 			err = got_error_from_errno("strndup");
2806 			break;
2807 		}
2808 		te = got_object_tree_find_entry(s->tree, te_name);
2809 		if (te == NULL) {
2810 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2811 			free(te_name);
2812 			break;
2813 		}
2814 		free(te_name);
2815 		s->first_displayed_entry = s->selected_entry = te;
2816 
2817 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2818 			break; /* jump to this file's entry */
2819 
2820 		slash = strchr(p, '/');
2821 		if (slash)
2822 			subpath = strndup(path, slash - path);
2823 		else
2824 			subpath = strdup(path);
2825 		if (subpath == NULL) {
2826 			err = got_error_from_errno("strdup");
2827 			break;
2828 		}
2829 
2830 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2831 		    subpath);
2832 		if (err)
2833 			break;
2834 
2835 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2836 		free(tree_id);
2837 		if (err)
2838 			break;
2839 
2840 		err = tree_view_visit_subtree(s, tree);
2841 		if (err) {
2842 			got_object_tree_close(tree);
2843 			break;
2844 		}
2845 		if (slash == NULL)
2846 			break;
2847 		free(subpath);
2848 		subpath = NULL;
2849 		p = slash;
2850 	}
2851 
2852 	free(subpath);
2853 	return err;
2854 }
2855 
2856 static const struct got_error *
2857 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2858     struct commit_queue_entry *entry, const char *path,
2859     const char *head_ref_name, struct got_repository *repo)
2860 {
2861 	const struct got_error *err = NULL;
2862 	struct tog_tree_view_state *s;
2863 	struct tog_view *tree_view;
2864 
2865 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2866 	if (tree_view == NULL)
2867 		return got_error_from_errno("view_open");
2868 
2869 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2870 	if (err)
2871 		return err;
2872 	s = &tree_view->state.tree;
2873 
2874 	*new_view = tree_view;
2875 
2876 	if (got_path_is_root_dir(path))
2877 		return NULL;
2878 
2879 	return tree_view_walk_path(s, entry->commit, path);
2880 }
2881 
2882 static const struct got_error *
2883 block_signals_used_by_main_thread(void)
2884 {
2885 	sigset_t sigset;
2886 	int errcode;
2887 
2888 	if (sigemptyset(&sigset) == -1)
2889 		return got_error_from_errno("sigemptyset");
2890 
2891 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2892 	if (sigaddset(&sigset, SIGWINCH) == -1)
2893 		return got_error_from_errno("sigaddset");
2894 	if (sigaddset(&sigset, SIGCONT) == -1)
2895 		return got_error_from_errno("sigaddset");
2896 	if (sigaddset(&sigset, SIGINT) == -1)
2897 		return got_error_from_errno("sigaddset");
2898 	if (sigaddset(&sigset, SIGTERM) == -1)
2899 		return got_error_from_errno("sigaddset");
2900 
2901 	/* ncurses handles SIGTSTP */
2902 	if (sigaddset(&sigset, SIGTSTP) == -1)
2903 		return got_error_from_errno("sigaddset");
2904 
2905 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2906 	if (errcode)
2907 		return got_error_set_errno(errcode, "pthread_sigmask");
2908 
2909 	return NULL;
2910 }
2911 
2912 static void *
2913 log_thread(void *arg)
2914 {
2915 	const struct got_error *err = NULL;
2916 	int errcode = 0;
2917 	struct tog_log_thread_args *a = arg;
2918 	int done = 0;
2919 
2920 	/*
2921 	 * Sync startup with main thread such that we begin our
2922 	 * work once view_input() has released the mutex.
2923 	 */
2924 	errcode = pthread_mutex_lock(&tog_mutex);
2925 	if (errcode) {
2926 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2927 		return (void *)err;
2928 	}
2929 
2930 	err = block_signals_used_by_main_thread();
2931 	if (err) {
2932 		pthread_mutex_unlock(&tog_mutex);
2933 		goto done;
2934 	}
2935 
2936 	while (!done && !err && !tog_fatal_signal_received()) {
2937 		errcode = pthread_mutex_unlock(&tog_mutex);
2938 		if (errcode) {
2939 			err = got_error_set_errno(errcode,
2940 			    "pthread_mutex_unlock");
2941 			goto done;
2942 		}
2943 		err = queue_commits(a);
2944 		if (err) {
2945 			if (err->code != GOT_ERR_ITER_COMPLETED)
2946 				goto done;
2947 			err = NULL;
2948 			done = 1;
2949 		} else if (a->commits_needed > 0 && !a->load_all) {
2950 			if (*a->limiting) {
2951 				if (a->limit_match)
2952 					a->commits_needed--;
2953 			} else
2954 				a->commits_needed--;
2955 		}
2956 
2957 		errcode = pthread_mutex_lock(&tog_mutex);
2958 		if (errcode) {
2959 			err = got_error_set_errno(errcode,
2960 			    "pthread_mutex_lock");
2961 			goto done;
2962 		} else if (*a->quit)
2963 			done = 1;
2964 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2965 			*a->first_displayed_entry =
2966 			    TAILQ_FIRST(&a->limit_commits->head);
2967 			*a->selected_entry = *a->first_displayed_entry;
2968 		} else if (*a->first_displayed_entry == NULL) {
2969 			*a->first_displayed_entry =
2970 			    TAILQ_FIRST(&a->real_commits->head);
2971 			*a->selected_entry = *a->first_displayed_entry;
2972 		}
2973 
2974 		errcode = pthread_cond_signal(&a->commit_loaded);
2975 		if (errcode) {
2976 			err = got_error_set_errno(errcode,
2977 			    "pthread_cond_signal");
2978 			pthread_mutex_unlock(&tog_mutex);
2979 			goto done;
2980 		}
2981 
2982 		if (done)
2983 			a->commits_needed = 0;
2984 		else {
2985 			if (a->commits_needed == 0 && !a->load_all) {
2986 				errcode = pthread_cond_wait(&a->need_commits,
2987 				    &tog_mutex);
2988 				if (errcode) {
2989 					err = got_error_set_errno(errcode,
2990 					    "pthread_cond_wait");
2991 					pthread_mutex_unlock(&tog_mutex);
2992 					goto done;
2993 				}
2994 				if (*a->quit)
2995 					done = 1;
2996 			}
2997 		}
2998 	}
2999 	a->log_complete = 1;
3000 	errcode = pthread_mutex_unlock(&tog_mutex);
3001 	if (errcode)
3002 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3003 done:
3004 	if (err) {
3005 		tog_thread_error = 1;
3006 		pthread_cond_signal(&a->commit_loaded);
3007 	}
3008 	return (void *)err;
3009 }
3010 
3011 static const struct got_error *
3012 stop_log_thread(struct tog_log_view_state *s)
3013 {
3014 	const struct got_error *err = NULL, *thread_err = NULL;
3015 	int errcode;
3016 
3017 	if (s->thread) {
3018 		s->quit = 1;
3019 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3020 		if (errcode)
3021 			return got_error_set_errno(errcode,
3022 			    "pthread_cond_signal");
3023 		errcode = pthread_mutex_unlock(&tog_mutex);
3024 		if (errcode)
3025 			return got_error_set_errno(errcode,
3026 			    "pthread_mutex_unlock");
3027 		errcode = pthread_join(s->thread, (void **)&thread_err);
3028 		if (errcode)
3029 			return got_error_set_errno(errcode, "pthread_join");
3030 		errcode = pthread_mutex_lock(&tog_mutex);
3031 		if (errcode)
3032 			return got_error_set_errno(errcode,
3033 			    "pthread_mutex_lock");
3034 		s->thread = NULL;
3035 	}
3036 
3037 	if (s->thread_args.repo) {
3038 		err = got_repo_close(s->thread_args.repo);
3039 		s->thread_args.repo = NULL;
3040 	}
3041 
3042 	if (s->thread_args.pack_fds) {
3043 		const struct got_error *pack_err =
3044 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3045 		if (err == NULL)
3046 			err = pack_err;
3047 		s->thread_args.pack_fds = NULL;
3048 	}
3049 
3050 	if (s->thread_args.graph) {
3051 		got_commit_graph_close(s->thread_args.graph);
3052 		s->thread_args.graph = NULL;
3053 	}
3054 
3055 	return err ? err : thread_err;
3056 }
3057 
3058 static const struct got_error *
3059 close_log_view(struct tog_view *view)
3060 {
3061 	const struct got_error *err = NULL;
3062 	struct tog_log_view_state *s = &view->state.log;
3063 	int errcode;
3064 
3065 	err = stop_log_thread(s);
3066 
3067 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3068 	if (errcode && err == NULL)
3069 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3070 
3071 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3072 	if (errcode && err == NULL)
3073 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3074 
3075 	free_commits(&s->limit_commits);
3076 	free_commits(&s->real_commits);
3077 	free(s->in_repo_path);
3078 	s->in_repo_path = NULL;
3079 	free(s->start_id);
3080 	s->start_id = NULL;
3081 	free(s->head_ref_name);
3082 	s->head_ref_name = NULL;
3083 	return err;
3084 }
3085 
3086 /*
3087  * We use two queues to implement the limit feature: first consists of
3088  * commits matching the current limit_regex; second is the real queue
3089  * of all known commits (real_commits). When the user starts limiting,
3090  * we swap queues such that all movement and displaying functionality
3091  * works with very slight change.
3092  */
3093 static const struct got_error *
3094 limit_log_view(struct tog_view *view)
3095 {
3096 	struct tog_log_view_state *s = &view->state.log;
3097 	struct commit_queue_entry *entry;
3098 	struct tog_view	*v = view;
3099 	const struct got_error *err = NULL;
3100 	char pattern[1024];
3101 	int ret;
3102 
3103 	if (view_is_hsplit_top(view))
3104 		v = view->child;
3105 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3106 		v = view->parent;
3107 
3108 	/* Get the pattern */
3109 	wmove(v->window, v->nlines - 1, 0);
3110 	wclrtoeol(v->window);
3111 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3112 	nodelay(v->window, FALSE);
3113 	nocbreak();
3114 	echo();
3115 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3116 	cbreak();
3117 	noecho();
3118 	nodelay(v->window, TRUE);
3119 	if (ret == ERR)
3120 		return NULL;
3121 
3122 	if (*pattern == '\0') {
3123 		/*
3124 		 * Safety measure for the situation where the user
3125 		 * resets limit without previously limiting anything.
3126 		 */
3127 		if (!s->limit_view)
3128 			return NULL;
3129 
3130 		/*
3131 		 * User could have pressed Ctrl+L, which refreshed the
3132 		 * commit queues, it means we can't save previously
3133 		 * (before limit took place) displayed entries,
3134 		 * because they would point to already free'ed memory,
3135 		 * so we are forced to always select first entry of
3136 		 * the queue.
3137 		 */
3138 		s->commits = &s->real_commits;
3139 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3140 		s->selected_entry = s->first_displayed_entry;
3141 		s->selected = 0;
3142 		s->limit_view = 0;
3143 
3144 		return NULL;
3145 	}
3146 
3147 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3148 		return NULL;
3149 
3150 	s->limit_view = 1;
3151 
3152 	/* Clear the screen while loading limit view */
3153 	s->first_displayed_entry = NULL;
3154 	s->last_displayed_entry = NULL;
3155 	s->selected_entry = NULL;
3156 	s->commits = &s->limit_commits;
3157 
3158 	/* Prepare limit queue for new search */
3159 	free_commits(&s->limit_commits);
3160 	s->limit_commits.ncommits = 0;
3161 
3162 	/* First process commits, which are in queue already */
3163 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3164 		int have_match = 0;
3165 
3166 		err = match_commit(&have_match, entry->id,
3167 		    entry->commit, &s->limit_regex);
3168 		if (err)
3169 			return err;
3170 
3171 		if (have_match) {
3172 			struct commit_queue_entry *matched;
3173 
3174 			matched = alloc_commit_queue_entry(entry->commit,
3175 			    entry->id);
3176 			if (matched == NULL) {
3177 				err = got_error_from_errno(
3178 				    "alloc_commit_queue_entry");
3179 				break;
3180 			}
3181 			matched->commit = entry->commit;
3182 			got_object_commit_retain(entry->commit);
3183 
3184 			matched->idx = s->limit_commits.ncommits;
3185 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3186 			    matched, entry);
3187 			s->limit_commits.ncommits++;
3188 		}
3189 	}
3190 
3191 	/* Second process all the commits, until we fill the screen */
3192 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3193 	    !s->thread_args.log_complete) {
3194 		s->thread_args.commits_needed +=
3195 		    view->nlines - s->limit_commits.ncommits - 1;
3196 		err = trigger_log_thread(view, 1);
3197 		if (err)
3198 			return err;
3199 	}
3200 
3201 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3202 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3203 	s->selected = 0;
3204 
3205 	return NULL;
3206 }
3207 
3208 static const struct got_error *
3209 search_start_log_view(struct tog_view *view)
3210 {
3211 	struct tog_log_view_state *s = &view->state.log;
3212 
3213 	s->matched_entry = NULL;
3214 	s->search_entry = NULL;
3215 	return NULL;
3216 }
3217 
3218 static const struct got_error *
3219 search_next_log_view(struct tog_view *view)
3220 {
3221 	const struct got_error *err = NULL;
3222 	struct tog_log_view_state *s = &view->state.log;
3223 	struct commit_queue_entry *entry;
3224 
3225 	/* Display progress update in log view. */
3226 	show_log_view(view);
3227 	update_panels();
3228 	doupdate();
3229 
3230 	if (s->search_entry) {
3231 		int errcode, ch;
3232 		errcode = pthread_mutex_unlock(&tog_mutex);
3233 		if (errcode)
3234 			return got_error_set_errno(errcode,
3235 			    "pthread_mutex_unlock");
3236 		ch = wgetch(view->window);
3237 		errcode = pthread_mutex_lock(&tog_mutex);
3238 		if (errcode)
3239 			return got_error_set_errno(errcode,
3240 			    "pthread_mutex_lock");
3241 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3242 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3243 			return NULL;
3244 		}
3245 		if (view->searching == TOG_SEARCH_FORWARD)
3246 			entry = TAILQ_NEXT(s->search_entry, entry);
3247 		else
3248 			entry = TAILQ_PREV(s->search_entry,
3249 			    commit_queue_head, entry);
3250 	} else if (s->matched_entry) {
3251 		/*
3252 		 * If the user has moved the cursor after we hit a match,
3253 		 * the position from where we should continue searching
3254 		 * might have changed.
3255 		 */
3256 		if (view->searching == TOG_SEARCH_FORWARD)
3257 			entry = TAILQ_NEXT(s->selected_entry, entry);
3258 		else
3259 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3260 			    entry);
3261 	} else {
3262 		entry = s->selected_entry;
3263 	}
3264 
3265 	while (1) {
3266 		int have_match = 0;
3267 
3268 		if (entry == NULL) {
3269 			if (s->thread_args.log_complete ||
3270 			    view->searching == TOG_SEARCH_BACKWARD) {
3271 				view->search_next_done =
3272 				    (s->matched_entry == NULL ?
3273 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3274 				s->search_entry = NULL;
3275 				return NULL;
3276 			}
3277 			/*
3278 			 * Poke the log thread for more commits and return,
3279 			 * allowing the main loop to make progress. Search
3280 			 * will resume at s->search_entry once we come back.
3281 			 */
3282 			s->thread_args.commits_needed++;
3283 			return trigger_log_thread(view, 0);
3284 		}
3285 
3286 		err = match_commit(&have_match, entry->id, entry->commit,
3287 		    &view->regex);
3288 		if (err)
3289 			break;
3290 		if (have_match) {
3291 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3292 			s->matched_entry = entry;
3293 			break;
3294 		}
3295 
3296 		s->search_entry = entry;
3297 		if (view->searching == TOG_SEARCH_FORWARD)
3298 			entry = TAILQ_NEXT(entry, entry);
3299 		else
3300 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3301 	}
3302 
3303 	if (s->matched_entry) {
3304 		int cur = s->selected_entry->idx;
3305 		while (cur < s->matched_entry->idx) {
3306 			err = input_log_view(NULL, view, KEY_DOWN);
3307 			if (err)
3308 				return err;
3309 			cur++;
3310 		}
3311 		while (cur > s->matched_entry->idx) {
3312 			err = input_log_view(NULL, view, KEY_UP);
3313 			if (err)
3314 				return err;
3315 			cur--;
3316 		}
3317 	}
3318 
3319 	s->search_entry = NULL;
3320 
3321 	return NULL;
3322 }
3323 
3324 static const struct got_error *
3325 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3326     struct got_repository *repo, const char *head_ref_name,
3327     const char *in_repo_path, int log_branches)
3328 {
3329 	const struct got_error *err = NULL;
3330 	struct tog_log_view_state *s = &view->state.log;
3331 	struct got_repository *thread_repo = NULL;
3332 	struct got_commit_graph *thread_graph = NULL;
3333 	int errcode;
3334 
3335 	if (in_repo_path != s->in_repo_path) {
3336 		free(s->in_repo_path);
3337 		s->in_repo_path = strdup(in_repo_path);
3338 		if (s->in_repo_path == NULL)
3339 			return got_error_from_errno("strdup");
3340 	}
3341 
3342 	/* The commit queue only contains commits being displayed. */
3343 	TAILQ_INIT(&s->real_commits.head);
3344 	s->real_commits.ncommits = 0;
3345 	s->commits = &s->real_commits;
3346 
3347 	TAILQ_INIT(&s->limit_commits.head);
3348 	s->limit_view = 0;
3349 	s->limit_commits.ncommits = 0;
3350 
3351 	s->repo = repo;
3352 	if (head_ref_name) {
3353 		s->head_ref_name = strdup(head_ref_name);
3354 		if (s->head_ref_name == NULL) {
3355 			err = got_error_from_errno("strdup");
3356 			goto done;
3357 		}
3358 	}
3359 	s->start_id = got_object_id_dup(start_id);
3360 	if (s->start_id == NULL) {
3361 		err = got_error_from_errno("got_object_id_dup");
3362 		goto done;
3363 	}
3364 	s->log_branches = log_branches;
3365 
3366 	STAILQ_INIT(&s->colors);
3367 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3368 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3369 		    get_color_value("TOG_COLOR_COMMIT"));
3370 		if (err)
3371 			goto done;
3372 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3373 		    get_color_value("TOG_COLOR_AUTHOR"));
3374 		if (err) {
3375 			free_colors(&s->colors);
3376 			goto done;
3377 		}
3378 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3379 		    get_color_value("TOG_COLOR_DATE"));
3380 		if (err) {
3381 			free_colors(&s->colors);
3382 			goto done;
3383 		}
3384 	}
3385 
3386 	view->show = show_log_view;
3387 	view->input = input_log_view;
3388 	view->resize = resize_log_view;
3389 	view->close = close_log_view;
3390 	view->search_start = search_start_log_view;
3391 	view->search_next = search_next_log_view;
3392 
3393 	if (s->thread_args.pack_fds == NULL) {
3394 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3395 		if (err)
3396 			goto done;
3397 	}
3398 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3399 	    s->thread_args.pack_fds);
3400 	if (err)
3401 		goto done;
3402 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3403 	    !s->log_branches);
3404 	if (err)
3405 		goto done;
3406 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3407 	    s->repo, NULL, NULL);
3408 	if (err)
3409 		goto done;
3410 
3411 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3412 	if (errcode) {
3413 		err = got_error_set_errno(errcode, "pthread_cond_init");
3414 		goto done;
3415 	}
3416 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3417 	if (errcode) {
3418 		err = got_error_set_errno(errcode, "pthread_cond_init");
3419 		goto done;
3420 	}
3421 
3422 	s->thread_args.commits_needed = view->nlines;
3423 	s->thread_args.graph = thread_graph;
3424 	s->thread_args.real_commits = &s->real_commits;
3425 	s->thread_args.limit_commits = &s->limit_commits;
3426 	s->thread_args.in_repo_path = s->in_repo_path;
3427 	s->thread_args.start_id = s->start_id;
3428 	s->thread_args.repo = thread_repo;
3429 	s->thread_args.log_complete = 0;
3430 	s->thread_args.quit = &s->quit;
3431 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3432 	s->thread_args.selected_entry = &s->selected_entry;
3433 	s->thread_args.searching = &view->searching;
3434 	s->thread_args.search_next_done = &view->search_next_done;
3435 	s->thread_args.regex = &view->regex;
3436 	s->thread_args.limiting = &s->limit_view;
3437 	s->thread_args.limit_regex = &s->limit_regex;
3438 	s->thread_args.limit_commits = &s->limit_commits;
3439 done:
3440 	if (err)
3441 		close_log_view(view);
3442 	return err;
3443 }
3444 
3445 static const struct got_error *
3446 show_log_view(struct tog_view *view)
3447 {
3448 	const struct got_error *err;
3449 	struct tog_log_view_state *s = &view->state.log;
3450 
3451 	if (s->thread == NULL) {
3452 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3453 		    &s->thread_args);
3454 		if (errcode)
3455 			return got_error_set_errno(errcode, "pthread_create");
3456 		if (s->thread_args.commits_needed > 0) {
3457 			err = trigger_log_thread(view, 1);
3458 			if (err)
3459 				return err;
3460 		}
3461 	}
3462 
3463 	return draw_commits(view);
3464 }
3465 
3466 static void
3467 log_move_cursor_up(struct tog_view *view, int page, int home)
3468 {
3469 	struct tog_log_view_state *s = &view->state.log;
3470 
3471 	if (s->first_displayed_entry == NULL)
3472 		return;
3473 	if (s->selected_entry->idx == 0)
3474 		view->count = 0;
3475 
3476 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3477 	    || home)
3478 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3479 
3480 	if (!page && !home && s->selected > 0)
3481 		--s->selected;
3482 	else
3483 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3484 
3485 	select_commit(s);
3486 	return;
3487 }
3488 
3489 static const struct got_error *
3490 log_move_cursor_down(struct tog_view *view, int page)
3491 {
3492 	struct tog_log_view_state	*s = &view->state.log;
3493 	const struct got_error		*err = NULL;
3494 	int				 eos = view->nlines - 2;
3495 
3496 	if (s->first_displayed_entry == NULL)
3497 		return NULL;
3498 
3499 	if (s->thread_args.log_complete &&
3500 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3501 		return NULL;
3502 
3503 	if (view_is_hsplit_top(view))
3504 		--eos;  /* border consumes the last line */
3505 
3506 	if (!page) {
3507 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3508 			++s->selected;
3509 		else
3510 			err = log_scroll_down(view, 1);
3511 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3512 		struct commit_queue_entry *entry;
3513 		int n;
3514 
3515 		s->selected = 0;
3516 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3517 		s->last_displayed_entry = entry;
3518 		for (n = 0; n <= eos; n++) {
3519 			if (entry == NULL)
3520 				break;
3521 			s->first_displayed_entry = entry;
3522 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3523 		}
3524 		if (n > 0)
3525 			s->selected = n - 1;
3526 	} else {
3527 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3528 		    s->thread_args.log_complete)
3529 			s->selected += MIN(page,
3530 			    s->commits->ncommits - s->selected_entry->idx - 1);
3531 		else
3532 			err = log_scroll_down(view, page);
3533 	}
3534 	if (err)
3535 		return err;
3536 
3537 	/*
3538 	 * We might necessarily overshoot in horizontal
3539 	 * splits; if so, select the last displayed commit.
3540 	 */
3541 	if (s->first_displayed_entry && s->last_displayed_entry) {
3542 		s->selected = MIN(s->selected,
3543 		    s->last_displayed_entry->idx -
3544 		    s->first_displayed_entry->idx);
3545 	}
3546 
3547 	select_commit(s);
3548 
3549 	if (s->thread_args.log_complete &&
3550 	    s->selected_entry->idx == s->commits->ncommits - 1)
3551 		view->count = 0;
3552 
3553 	return NULL;
3554 }
3555 
3556 static void
3557 view_get_split(struct tog_view *view, int *y, int *x)
3558 {
3559 	*x = 0;
3560 	*y = 0;
3561 
3562 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3563 		if (view->child && view->child->resized_y)
3564 			*y = view->child->resized_y;
3565 		else if (view->resized_y)
3566 			*y = view->resized_y;
3567 		else
3568 			*y = view_split_begin_y(view->lines);
3569 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3570 		if (view->child && view->child->resized_x)
3571 			*x = view->child->resized_x;
3572 		else if (view->resized_x)
3573 			*x = view->resized_x;
3574 		else
3575 			*x = view_split_begin_x(view->begin_x);
3576 	}
3577 }
3578 
3579 /* Split view horizontally at y and offset view->state->selected line. */
3580 static const struct got_error *
3581 view_init_hsplit(struct tog_view *view, int y)
3582 {
3583 	const struct got_error *err = NULL;
3584 
3585 	view->nlines = y;
3586 	view->ncols = COLS;
3587 	err = view_resize(view);
3588 	if (err)
3589 		return err;
3590 
3591 	err = offset_selection_down(view);
3592 
3593 	return err;
3594 }
3595 
3596 static const struct got_error *
3597 log_goto_line(struct tog_view *view, int nlines)
3598 {
3599 	const struct got_error		*err = NULL;
3600 	struct tog_log_view_state	*s = &view->state.log;
3601 	int				 g, idx = s->selected_entry->idx;
3602 
3603 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3604 		return NULL;
3605 
3606 	g = view->gline;
3607 	view->gline = 0;
3608 
3609 	if (g >= s->first_displayed_entry->idx + 1 &&
3610 	    g <= s->last_displayed_entry->idx + 1 &&
3611 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3612 		s->selected = g - s->first_displayed_entry->idx - 1;
3613 		select_commit(s);
3614 		return NULL;
3615 	}
3616 
3617 	if (idx + 1 < g) {
3618 		err = log_move_cursor_down(view, g - idx - 1);
3619 		if (!err && g > s->selected_entry->idx + 1)
3620 			err = log_move_cursor_down(view,
3621 			    g - s->first_displayed_entry->idx - 1);
3622 		if (err)
3623 			return err;
3624 	} else if (idx + 1 > g)
3625 		log_move_cursor_up(view, idx - g + 1, 0);
3626 
3627 	if (g < nlines && s->first_displayed_entry->idx == 0)
3628 		s->selected = g - 1;
3629 
3630 	select_commit(s);
3631 	return NULL;
3632 
3633 }
3634 
3635 static const struct got_error *
3636 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3637 {
3638 	const struct got_error *err = NULL;
3639 	struct tog_log_view_state *s = &view->state.log;
3640 	int eos, nscroll;
3641 
3642 	if (s->thread_args.load_all) {
3643 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3644 			s->thread_args.load_all = 0;
3645 		else if (s->thread_args.log_complete) {
3646 			err = log_move_cursor_down(view, s->commits->ncommits);
3647 			s->thread_args.load_all = 0;
3648 		}
3649 		if (err)
3650 			return err;
3651 	}
3652 
3653 	eos = nscroll = view->nlines - 1;
3654 	if (view_is_hsplit_top(view))
3655 		--eos;  /* border */
3656 
3657 	if (view->gline)
3658 		return log_goto_line(view, eos);
3659 
3660 	switch (ch) {
3661 	case '&':
3662 		err = limit_log_view(view);
3663 		break;
3664 	case 'q':
3665 		s->quit = 1;
3666 		break;
3667 	case '0':
3668 		view->x = 0;
3669 		break;
3670 	case '$':
3671 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3672 		view->count = 0;
3673 		break;
3674 	case KEY_RIGHT:
3675 	case 'l':
3676 		if (view->x + view->ncols / 2 < view->maxx)
3677 			view->x += 2;  /* move two columns right */
3678 		else
3679 			view->count = 0;
3680 		break;
3681 	case KEY_LEFT:
3682 	case 'h':
3683 		view->x -= MIN(view->x, 2);  /* move two columns back */
3684 		if (view->x <= 0)
3685 			view->count = 0;
3686 		break;
3687 	case 'k':
3688 	case KEY_UP:
3689 	case '<':
3690 	case ',':
3691 	case CTRL('p'):
3692 		log_move_cursor_up(view, 0, 0);
3693 		break;
3694 	case 'g':
3695 	case KEY_HOME:
3696 		log_move_cursor_up(view, 0, 1);
3697 		view->count = 0;
3698 		break;
3699 	case CTRL('u'):
3700 	case 'u':
3701 		nscroll /= 2;
3702 		/* FALL THROUGH */
3703 	case KEY_PPAGE:
3704 	case CTRL('b'):
3705 	case 'b':
3706 		log_move_cursor_up(view, nscroll, 0);
3707 		break;
3708 	case 'j':
3709 	case KEY_DOWN:
3710 	case '>':
3711 	case '.':
3712 	case CTRL('n'):
3713 		err = log_move_cursor_down(view, 0);
3714 		break;
3715 	case '@':
3716 		s->use_committer = !s->use_committer;
3717 		break;
3718 	case 'G':
3719 	case KEY_END: {
3720 		/* We don't know yet how many commits, so we're forced to
3721 		 * traverse them all. */
3722 		view->count = 0;
3723 		s->thread_args.load_all = 1;
3724 		if (!s->thread_args.log_complete)
3725 			return trigger_log_thread(view, 0);
3726 		err = log_move_cursor_down(view, s->commits->ncommits);
3727 		s->thread_args.load_all = 0;
3728 		break;
3729 	}
3730 	case CTRL('d'):
3731 	case 'd':
3732 		nscroll /= 2;
3733 		/* FALL THROUGH */
3734 	case KEY_NPAGE:
3735 	case CTRL('f'):
3736 	case 'f':
3737 	case ' ':
3738 		err = log_move_cursor_down(view, nscroll);
3739 		break;
3740 	case KEY_RESIZE:
3741 		if (s->selected > view->nlines - 2)
3742 			s->selected = view->nlines - 2;
3743 		if (s->selected > s->commits->ncommits - 1)
3744 			s->selected = s->commits->ncommits - 1;
3745 		select_commit(s);
3746 		if (s->commits->ncommits < view->nlines - 1 &&
3747 		    !s->thread_args.log_complete) {
3748 			s->thread_args.commits_needed += (view->nlines - 1) -
3749 			    s->commits->ncommits;
3750 			err = trigger_log_thread(view, 1);
3751 		}
3752 		break;
3753 	case KEY_ENTER:
3754 	case '\r':
3755 		view->count = 0;
3756 		if (s->selected_entry == NULL)
3757 			break;
3758 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3759 		break;
3760 	case 'T':
3761 		view->count = 0;
3762 		if (s->selected_entry == NULL)
3763 			break;
3764 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3765 		break;
3766 	case KEY_BACKSPACE:
3767 	case CTRL('l'):
3768 	case 'B':
3769 		view->count = 0;
3770 		if (ch == KEY_BACKSPACE &&
3771 		    got_path_is_root_dir(s->in_repo_path))
3772 			break;
3773 		err = stop_log_thread(s);
3774 		if (err)
3775 			return err;
3776 		if (ch == KEY_BACKSPACE) {
3777 			char *parent_path;
3778 			err = got_path_dirname(&parent_path, s->in_repo_path);
3779 			if (err)
3780 				return err;
3781 			free(s->in_repo_path);
3782 			s->in_repo_path = parent_path;
3783 			s->thread_args.in_repo_path = s->in_repo_path;
3784 		} else if (ch == CTRL('l')) {
3785 			struct got_object_id *start_id;
3786 			err = got_repo_match_object_id(&start_id, NULL,
3787 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3788 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3789 			if (err) {
3790 				if (s->head_ref_name == NULL ||
3791 				    err->code != GOT_ERR_NOT_REF)
3792 					return err;
3793 				/* Try to cope with deleted references. */
3794 				free(s->head_ref_name);
3795 				s->head_ref_name = NULL;
3796 				err = got_repo_match_object_id(&start_id,
3797 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3798 				    &tog_refs, s->repo);
3799 				if (err)
3800 					return err;
3801 			}
3802 			free(s->start_id);
3803 			s->start_id = start_id;
3804 			s->thread_args.start_id = s->start_id;
3805 		} else /* 'B' */
3806 			s->log_branches = !s->log_branches;
3807 
3808 		if (s->thread_args.pack_fds == NULL) {
3809 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3810 			if (err)
3811 				return err;
3812 		}
3813 		err = got_repo_open(&s->thread_args.repo,
3814 		    got_repo_get_path(s->repo), NULL,
3815 		    s->thread_args.pack_fds);
3816 		if (err)
3817 			return err;
3818 		tog_free_refs();
3819 		err = tog_load_refs(s->repo, 0);
3820 		if (err)
3821 			return err;
3822 		err = got_commit_graph_open(&s->thread_args.graph,
3823 		    s->in_repo_path, !s->log_branches);
3824 		if (err)
3825 			return err;
3826 		err = got_commit_graph_iter_start(s->thread_args.graph,
3827 		    s->start_id, s->repo, NULL, NULL);
3828 		if (err)
3829 			return err;
3830 		free_commits(&s->real_commits);
3831 		free_commits(&s->limit_commits);
3832 		s->first_displayed_entry = NULL;
3833 		s->last_displayed_entry = NULL;
3834 		s->selected_entry = NULL;
3835 		s->selected = 0;
3836 		s->thread_args.log_complete = 0;
3837 		s->quit = 0;
3838 		s->thread_args.commits_needed = view->lines;
3839 		s->matched_entry = NULL;
3840 		s->search_entry = NULL;
3841 		view->offset = 0;
3842 		break;
3843 	case 'R':
3844 		view->count = 0;
3845 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3846 		break;
3847 	default:
3848 		view->count = 0;
3849 		break;
3850 	}
3851 
3852 	return err;
3853 }
3854 
3855 static const struct got_error *
3856 apply_unveil(const char *repo_path, const char *worktree_path)
3857 {
3858 	const struct got_error *error;
3859 
3860 #ifdef PROFILE
3861 	if (unveil("gmon.out", "rwc") != 0)
3862 		return got_error_from_errno2("unveil", "gmon.out");
3863 #endif
3864 	if (repo_path && unveil(repo_path, "r") != 0)
3865 		return got_error_from_errno2("unveil", repo_path);
3866 
3867 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3868 		return got_error_from_errno2("unveil", worktree_path);
3869 
3870 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3871 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3872 
3873 	error = got_privsep_unveil_exec_helpers();
3874 	if (error != NULL)
3875 		return error;
3876 
3877 	if (unveil(NULL, NULL) != 0)
3878 		return got_error_from_errno("unveil");
3879 
3880 	return NULL;
3881 }
3882 
3883 static void
3884 init_curses(void)
3885 {
3886 	/*
3887 	 * Override default signal handlers before starting ncurses.
3888 	 * This should prevent ncurses from installing its own
3889 	 * broken cleanup() signal handler.
3890 	 */
3891 	signal(SIGWINCH, tog_sigwinch);
3892 	signal(SIGPIPE, tog_sigpipe);
3893 	signal(SIGCONT, tog_sigcont);
3894 	signal(SIGINT, tog_sigint);
3895 	signal(SIGTERM, tog_sigterm);
3896 
3897 	initscr();
3898 	cbreak();
3899 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3900 	noecho();
3901 	nonl();
3902 	intrflush(stdscr, FALSE);
3903 	keypad(stdscr, TRUE);
3904 	curs_set(0);
3905 	if (getenv("TOG_COLORS") != NULL) {
3906 		start_color();
3907 		use_default_colors();
3908 	}
3909 }
3910 
3911 static const struct got_error *
3912 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3913     struct got_repository *repo, struct got_worktree *worktree)
3914 {
3915 	const struct got_error *err = NULL;
3916 
3917 	if (argc == 0) {
3918 		*in_repo_path = strdup("/");
3919 		if (*in_repo_path == NULL)
3920 			return got_error_from_errno("strdup");
3921 		return NULL;
3922 	}
3923 
3924 	if (worktree) {
3925 		const char *prefix = got_worktree_get_path_prefix(worktree);
3926 		char *p;
3927 
3928 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3929 		if (err)
3930 			return err;
3931 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3932 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3933 		    p) == -1) {
3934 			err = got_error_from_errno("asprintf");
3935 			*in_repo_path = NULL;
3936 		}
3937 		free(p);
3938 	} else
3939 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3940 
3941 	return err;
3942 }
3943 
3944 static const struct got_error *
3945 cmd_log(int argc, char *argv[])
3946 {
3947 	const struct got_error *error;
3948 	struct got_repository *repo = NULL;
3949 	struct got_worktree *worktree = NULL;
3950 	struct got_object_id *start_id = NULL;
3951 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3952 	char *start_commit = NULL, *label = NULL;
3953 	struct got_reference *ref = NULL;
3954 	const char *head_ref_name = NULL;
3955 	int ch, log_branches = 0;
3956 	struct tog_view *view;
3957 	int *pack_fds = NULL;
3958 
3959 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3960 		switch (ch) {
3961 		case 'b':
3962 			log_branches = 1;
3963 			break;
3964 		case 'c':
3965 			start_commit = optarg;
3966 			break;
3967 		case 'r':
3968 			repo_path = realpath(optarg, NULL);
3969 			if (repo_path == NULL)
3970 				return got_error_from_errno2("realpath",
3971 				    optarg);
3972 			break;
3973 		default:
3974 			usage_log();
3975 			/* NOTREACHED */
3976 		}
3977 	}
3978 
3979 	argc -= optind;
3980 	argv += optind;
3981 
3982 	if (argc > 1)
3983 		usage_log();
3984 
3985 	error = got_repo_pack_fds_open(&pack_fds);
3986 	if (error != NULL)
3987 		goto done;
3988 
3989 	if (repo_path == NULL) {
3990 		cwd = getcwd(NULL, 0);
3991 		if (cwd == NULL)
3992 			return got_error_from_errno("getcwd");
3993 		error = got_worktree_open(&worktree, cwd);
3994 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3995 			goto done;
3996 		if (worktree)
3997 			repo_path =
3998 			    strdup(got_worktree_get_repo_path(worktree));
3999 		else
4000 			repo_path = strdup(cwd);
4001 		if (repo_path == NULL) {
4002 			error = got_error_from_errno("strdup");
4003 			goto done;
4004 		}
4005 	}
4006 
4007 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4008 	if (error != NULL)
4009 		goto done;
4010 
4011 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4012 	    repo, worktree);
4013 	if (error)
4014 		goto done;
4015 
4016 	init_curses();
4017 
4018 	error = apply_unveil(got_repo_get_path(repo),
4019 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4020 	if (error)
4021 		goto done;
4022 
4023 	/* already loaded by tog_log_with_path()? */
4024 	if (TAILQ_EMPTY(&tog_refs)) {
4025 		error = tog_load_refs(repo, 0);
4026 		if (error)
4027 			goto done;
4028 	}
4029 
4030 	if (start_commit == NULL) {
4031 		error = got_repo_match_object_id(&start_id, &label,
4032 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4033 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4034 		if (error)
4035 			goto done;
4036 		head_ref_name = label;
4037 	} else {
4038 		error = got_ref_open(&ref, repo, start_commit, 0);
4039 		if (error == NULL)
4040 			head_ref_name = got_ref_get_name(ref);
4041 		else if (error->code != GOT_ERR_NOT_REF)
4042 			goto done;
4043 		error = got_repo_match_object_id(&start_id, NULL,
4044 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4045 		if (error)
4046 			goto done;
4047 	}
4048 
4049 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4050 	if (view == NULL) {
4051 		error = got_error_from_errno("view_open");
4052 		goto done;
4053 	}
4054 	error = open_log_view(view, start_id, repo, head_ref_name,
4055 	    in_repo_path, log_branches);
4056 	if (error)
4057 		goto done;
4058 	if (worktree) {
4059 		/* Release work tree lock. */
4060 		got_worktree_close(worktree);
4061 		worktree = NULL;
4062 	}
4063 	error = view_loop(view);
4064 done:
4065 	free(in_repo_path);
4066 	free(repo_path);
4067 	free(cwd);
4068 	free(start_id);
4069 	free(label);
4070 	if (ref)
4071 		got_ref_close(ref);
4072 	if (repo) {
4073 		const struct got_error *close_err = got_repo_close(repo);
4074 		if (error == NULL)
4075 			error = close_err;
4076 	}
4077 	if (worktree)
4078 		got_worktree_close(worktree);
4079 	if (pack_fds) {
4080 		const struct got_error *pack_err =
4081 		    got_repo_pack_fds_close(pack_fds);
4082 		if (error == NULL)
4083 			error = pack_err;
4084 	}
4085 	tog_free_refs();
4086 	return error;
4087 }
4088 
4089 __dead static void
4090 usage_diff(void)
4091 {
4092 	endwin();
4093 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4094 	    "object1 object2\n", getprogname());
4095 	exit(1);
4096 }
4097 
4098 static int
4099 match_line(const char *line, regex_t *regex, size_t nmatch,
4100     regmatch_t *regmatch)
4101 {
4102 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4103 }
4104 
4105 static struct tog_color *
4106 match_color(struct tog_colors *colors, const char *line)
4107 {
4108 	struct tog_color *tc = NULL;
4109 
4110 	STAILQ_FOREACH(tc, colors, entry) {
4111 		if (match_line(line, &tc->regex, 0, NULL))
4112 			return tc;
4113 	}
4114 
4115 	return NULL;
4116 }
4117 
4118 static const struct got_error *
4119 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4120     WINDOW *window, int skipcol, regmatch_t *regmatch)
4121 {
4122 	const struct got_error *err = NULL;
4123 	char *exstr = NULL;
4124 	wchar_t *wline = NULL;
4125 	int rme, rms, n, width, scrollx;
4126 	int width0 = 0, width1 = 0, width2 = 0;
4127 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4128 
4129 	*wtotal = 0;
4130 
4131 	rms = regmatch->rm_so;
4132 	rme = regmatch->rm_eo;
4133 
4134 	err = expand_tab(&exstr, line);
4135 	if (err)
4136 		return err;
4137 
4138 	/* Split the line into 3 segments, according to match offsets. */
4139 	seg0 = strndup(exstr, rms);
4140 	if (seg0 == NULL) {
4141 		err = got_error_from_errno("strndup");
4142 		goto done;
4143 	}
4144 	seg1 = strndup(exstr + rms, rme - rms);
4145 	if (seg1 == NULL) {
4146 		err = got_error_from_errno("strndup");
4147 		goto done;
4148 	}
4149 	seg2 = strdup(exstr + rme);
4150 	if (seg2 == NULL) {
4151 		err = got_error_from_errno("strndup");
4152 		goto done;
4153 	}
4154 
4155 	/* draw up to matched token if we haven't scrolled past it */
4156 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4157 	    col_tab_align, 1);
4158 	if (err)
4159 		goto done;
4160 	n = MAX(width0 - skipcol, 0);
4161 	if (n) {
4162 		free(wline);
4163 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4164 		    wlimit, col_tab_align, 1);
4165 		if (err)
4166 			goto done;
4167 		waddwstr(window, &wline[scrollx]);
4168 		wlimit -= width;
4169 		*wtotal += width;
4170 	}
4171 
4172 	if (wlimit > 0) {
4173 		int i = 0, w = 0;
4174 		size_t wlen;
4175 
4176 		free(wline);
4177 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4178 		    col_tab_align, 1);
4179 		if (err)
4180 			goto done;
4181 		wlen = wcslen(wline);
4182 		while (i < wlen) {
4183 			width = wcwidth(wline[i]);
4184 			if (width == -1) {
4185 				/* should not happen, tabs are expanded */
4186 				err = got_error(GOT_ERR_RANGE);
4187 				goto done;
4188 			}
4189 			if (width0 + w + width > skipcol)
4190 				break;
4191 			w += width;
4192 			i++;
4193 		}
4194 		/* draw (visible part of) matched token (if scrolled into it) */
4195 		if (width1 - w > 0) {
4196 			wattron(window, A_STANDOUT);
4197 			waddwstr(window, &wline[i]);
4198 			wattroff(window, A_STANDOUT);
4199 			wlimit -= (width1 - w);
4200 			*wtotal += (width1 - w);
4201 		}
4202 	}
4203 
4204 	if (wlimit > 0) {  /* draw rest of line */
4205 		free(wline);
4206 		if (skipcol > width0 + width1) {
4207 			err = format_line(&wline, &width2, &scrollx, seg2,
4208 			    skipcol - (width0 + width1), wlimit,
4209 			    col_tab_align, 1);
4210 			if (err)
4211 				goto done;
4212 			waddwstr(window, &wline[scrollx]);
4213 		} else {
4214 			err = format_line(&wline, &width2, NULL, seg2, 0,
4215 			    wlimit, col_tab_align, 1);
4216 			if (err)
4217 				goto done;
4218 			waddwstr(window, wline);
4219 		}
4220 		*wtotal += width2;
4221 	}
4222 done:
4223 	free(wline);
4224 	free(exstr);
4225 	free(seg0);
4226 	free(seg1);
4227 	free(seg2);
4228 	return err;
4229 }
4230 
4231 static int
4232 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4233 {
4234 	FILE	*f = NULL;
4235 	int	*eof, *first, *selected;
4236 
4237 	if (view->type == TOG_VIEW_DIFF) {
4238 		struct tog_diff_view_state *s = &view->state.diff;
4239 
4240 		first = &s->first_displayed_line;
4241 		selected = first;
4242 		eof = &s->eof;
4243 		f = s->f;
4244 	} else if (view->type == TOG_VIEW_HELP) {
4245 		struct tog_help_view_state *s = &view->state.help;
4246 
4247 		first = &s->first_displayed_line;
4248 		selected = first;
4249 		eof = &s->eof;
4250 		f = s->f;
4251 	} else if (view->type == TOG_VIEW_BLAME) {
4252 		struct tog_blame_view_state *s = &view->state.blame;
4253 
4254 		first = &s->first_displayed_line;
4255 		selected = &s->selected_line;
4256 		eof = &s->eof;
4257 		f = s->blame.f;
4258 	} else
4259 		return 0;
4260 
4261 	/* Center gline in the middle of the page like vi(1). */
4262 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4263 		return 0;
4264 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4265 		rewind(f);
4266 		*eof = 0;
4267 		*first = 1;
4268 		*lineno = 0;
4269 		*nprinted = 0;
4270 		return 0;
4271 	}
4272 
4273 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4274 		view->gline : (view->nlines - 3) / 2 + 1;
4275 	view->gline = 0;
4276 
4277 	return 1;
4278 }
4279 
4280 static const struct got_error *
4281 draw_file(struct tog_view *view, const char *header)
4282 {
4283 	struct tog_diff_view_state *s = &view->state.diff;
4284 	regmatch_t *regmatch = &view->regmatch;
4285 	const struct got_error *err;
4286 	int nprinted = 0;
4287 	char *line;
4288 	size_t linesize = 0;
4289 	ssize_t linelen;
4290 	wchar_t *wline;
4291 	int width;
4292 	int max_lines = view->nlines;
4293 	int nlines = s->nlines;
4294 	off_t line_offset;
4295 
4296 	s->lineno = s->first_displayed_line - 1;
4297 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4298 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4299 		return got_error_from_errno("fseek");
4300 
4301 	werase(view->window);
4302 
4303 	if (view->gline > s->nlines - 1)
4304 		view->gline = s->nlines - 1;
4305 
4306 	if (header) {
4307 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4308 		    1 : view->gline - (view->nlines - 3) / 2 :
4309 		    s->lineno + s->selected_line;
4310 
4311 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4312 			return got_error_from_errno("asprintf");
4313 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4314 		    0, 0);
4315 		free(line);
4316 		if (err)
4317 			return err;
4318 
4319 		if (view_needs_focus_indication(view))
4320 			wstandout(view->window);
4321 		waddwstr(view->window, wline);
4322 		free(wline);
4323 		wline = NULL;
4324 		while (width++ < view->ncols)
4325 			waddch(view->window, ' ');
4326 		if (view_needs_focus_indication(view))
4327 			wstandend(view->window);
4328 
4329 		if (max_lines <= 1)
4330 			return NULL;
4331 		max_lines--;
4332 	}
4333 
4334 	s->eof = 0;
4335 	view->maxx = 0;
4336 	line = NULL;
4337 	while (max_lines > 0 && nprinted < max_lines) {
4338 		enum got_diff_line_type linetype;
4339 		attr_t attr = 0;
4340 
4341 		linelen = getline(&line, &linesize, s->f);
4342 		if (linelen == -1) {
4343 			if (feof(s->f)) {
4344 				s->eof = 1;
4345 				break;
4346 			}
4347 			free(line);
4348 			return got_ferror(s->f, GOT_ERR_IO);
4349 		}
4350 
4351 		if (++s->lineno < s->first_displayed_line)
4352 			continue;
4353 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4354 			continue;
4355 		if (s->lineno == view->hiline)
4356 			attr = A_STANDOUT;
4357 
4358 		/* Set view->maxx based on full line length. */
4359 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4360 		    view->x ? 1 : 0);
4361 		if (err) {
4362 			free(line);
4363 			return err;
4364 		}
4365 		view->maxx = MAX(view->maxx, width);
4366 		free(wline);
4367 		wline = NULL;
4368 
4369 		linetype = s->lines[s->lineno].type;
4370 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4371 		    linetype < GOT_DIFF_LINE_CONTEXT)
4372 			attr |= COLOR_PAIR(linetype);
4373 		if (attr)
4374 			wattron(view->window, attr);
4375 		if (s->first_displayed_line + nprinted == s->matched_line &&
4376 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4377 			err = add_matched_line(&width, line, view->ncols, 0,
4378 			    view->window, view->x, regmatch);
4379 			if (err) {
4380 				free(line);
4381 				return err;
4382 			}
4383 		} else {
4384 			int skip;
4385 			err = format_line(&wline, &width, &skip, line,
4386 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4387 			if (err) {
4388 				free(line);
4389 				return err;
4390 			}
4391 			waddwstr(view->window, &wline[skip]);
4392 			free(wline);
4393 			wline = NULL;
4394 		}
4395 		if (s->lineno == view->hiline) {
4396 			/* highlight full gline length */
4397 			while (width++ < view->ncols)
4398 				waddch(view->window, ' ');
4399 		} else {
4400 			if (width <= view->ncols - 1)
4401 				waddch(view->window, '\n');
4402 		}
4403 		if (attr)
4404 			wattroff(view->window, attr);
4405 		if (++nprinted == 1)
4406 			s->first_displayed_line = s->lineno;
4407 	}
4408 	free(line);
4409 	if (nprinted >= 1)
4410 		s->last_displayed_line = s->first_displayed_line +
4411 		    (nprinted - 1);
4412 	else
4413 		s->last_displayed_line = s->first_displayed_line;
4414 
4415 	view_border(view);
4416 
4417 	if (s->eof) {
4418 		while (nprinted < view->nlines) {
4419 			waddch(view->window, '\n');
4420 			nprinted++;
4421 		}
4422 
4423 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4424 		    view->ncols, 0, 0);
4425 		if (err) {
4426 			return err;
4427 		}
4428 
4429 		wstandout(view->window);
4430 		waddwstr(view->window, wline);
4431 		free(wline);
4432 		wline = NULL;
4433 		wstandend(view->window);
4434 	}
4435 
4436 	return NULL;
4437 }
4438 
4439 static char *
4440 get_datestr(time_t *time, char *datebuf)
4441 {
4442 	struct tm mytm, *tm;
4443 	char *p, *s;
4444 
4445 	tm = gmtime_r(time, &mytm);
4446 	if (tm == NULL)
4447 		return NULL;
4448 	s = asctime_r(tm, datebuf);
4449 	if (s == NULL)
4450 		return NULL;
4451 	p = strchr(s, '\n');
4452 	if (p)
4453 		*p = '\0';
4454 	return s;
4455 }
4456 
4457 static const struct got_error *
4458 get_changed_paths(struct got_pathlist_head *paths,
4459     struct got_commit_object *commit, struct got_repository *repo)
4460 {
4461 	const struct got_error *err = NULL;
4462 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4463 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4464 	struct got_object_qid *qid;
4465 
4466 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4467 	if (qid != NULL) {
4468 		struct got_commit_object *pcommit;
4469 		err = got_object_open_as_commit(&pcommit, repo,
4470 		    &qid->id);
4471 		if (err)
4472 			return err;
4473 
4474 		tree_id1 = got_object_id_dup(
4475 		    got_object_commit_get_tree_id(pcommit));
4476 		if (tree_id1 == NULL) {
4477 			got_object_commit_close(pcommit);
4478 			return got_error_from_errno("got_object_id_dup");
4479 		}
4480 		got_object_commit_close(pcommit);
4481 
4482 	}
4483 
4484 	if (tree_id1) {
4485 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4486 		if (err)
4487 			goto done;
4488 	}
4489 
4490 	tree_id2 = got_object_commit_get_tree_id(commit);
4491 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4492 	if (err)
4493 		goto done;
4494 
4495 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4496 	    got_diff_tree_collect_changed_paths, paths, 0);
4497 done:
4498 	if (tree1)
4499 		got_object_tree_close(tree1);
4500 	if (tree2)
4501 		got_object_tree_close(tree2);
4502 	free(tree_id1);
4503 	return err;
4504 }
4505 
4506 static const struct got_error *
4507 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4508     off_t off, uint8_t type)
4509 {
4510 	struct got_diff_line *p;
4511 
4512 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4513 	if (p == NULL)
4514 		return got_error_from_errno("reallocarray");
4515 	*lines = p;
4516 	(*lines)[*nlines].offset = off;
4517 	(*lines)[*nlines].type = type;
4518 	(*nlines)++;
4519 
4520 	return NULL;
4521 }
4522 
4523 static const struct got_error *
4524 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4525     struct got_object_id *commit_id, struct got_reflist_head *refs,
4526     struct got_repository *repo, FILE *outfile)
4527 {
4528 	const struct got_error *err = NULL;
4529 	char datebuf[26], *datestr;
4530 	struct got_commit_object *commit;
4531 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4532 	time_t committer_time;
4533 	const char *author, *committer;
4534 	char *refs_str = NULL;
4535 	struct got_pathlist_head changed_paths;
4536 	struct got_pathlist_entry *pe;
4537 	off_t outoff = 0;
4538 	int n;
4539 
4540 	TAILQ_INIT(&changed_paths);
4541 
4542 	if (refs) {
4543 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4544 		if (err)
4545 			return err;
4546 	}
4547 
4548 	err = got_object_open_as_commit(&commit, repo, commit_id);
4549 	if (err)
4550 		return err;
4551 
4552 	err = got_object_id_str(&id_str, commit_id);
4553 	if (err) {
4554 		err = got_error_from_errno("got_object_id_str");
4555 		goto done;
4556 	}
4557 
4558 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4559 	if (err)
4560 		goto done;
4561 
4562 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4563 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4564 	if (n < 0) {
4565 		err = got_error_from_errno("fprintf");
4566 		goto done;
4567 	}
4568 	outoff += n;
4569 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4570 	if (err)
4571 		goto done;
4572 
4573 	n = fprintf(outfile, "from: %s\n",
4574 	    got_object_commit_get_author(commit));
4575 	if (n < 0) {
4576 		err = got_error_from_errno("fprintf");
4577 		goto done;
4578 	}
4579 	outoff += n;
4580 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4581 	if (err)
4582 		goto done;
4583 
4584 	committer_time = got_object_commit_get_committer_time(commit);
4585 	datestr = get_datestr(&committer_time, datebuf);
4586 	if (datestr) {
4587 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4588 		if (n < 0) {
4589 			err = got_error_from_errno("fprintf");
4590 			goto done;
4591 		}
4592 		outoff += n;
4593 		err = add_line_metadata(lines, nlines, outoff,
4594 		    GOT_DIFF_LINE_DATE);
4595 		if (err)
4596 			goto done;
4597 	}
4598 	author = got_object_commit_get_author(commit);
4599 	committer = got_object_commit_get_committer(commit);
4600 	if (strcmp(author, committer) != 0) {
4601 		n = fprintf(outfile, "via: %s\n", committer);
4602 		if (n < 0) {
4603 			err = got_error_from_errno("fprintf");
4604 			goto done;
4605 		}
4606 		outoff += n;
4607 		err = add_line_metadata(lines, nlines, outoff,
4608 		    GOT_DIFF_LINE_AUTHOR);
4609 		if (err)
4610 			goto done;
4611 	}
4612 	if (got_object_commit_get_nparents(commit) > 1) {
4613 		const struct got_object_id_queue *parent_ids;
4614 		struct got_object_qid *qid;
4615 		int pn = 1;
4616 		parent_ids = got_object_commit_get_parent_ids(commit);
4617 		STAILQ_FOREACH(qid, parent_ids, entry) {
4618 			err = got_object_id_str(&id_str, &qid->id);
4619 			if (err)
4620 				goto done;
4621 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4622 			if (n < 0) {
4623 				err = got_error_from_errno("fprintf");
4624 				goto done;
4625 			}
4626 			outoff += n;
4627 			err = add_line_metadata(lines, nlines, outoff,
4628 			    GOT_DIFF_LINE_META);
4629 			if (err)
4630 				goto done;
4631 			free(id_str);
4632 			id_str = NULL;
4633 		}
4634 	}
4635 
4636 	err = got_object_commit_get_logmsg(&logmsg, commit);
4637 	if (err)
4638 		goto done;
4639 	s = logmsg;
4640 	while ((line = strsep(&s, "\n")) != NULL) {
4641 		n = fprintf(outfile, "%s\n", line);
4642 		if (n < 0) {
4643 			err = got_error_from_errno("fprintf");
4644 			goto done;
4645 		}
4646 		outoff += n;
4647 		err = add_line_metadata(lines, nlines, outoff,
4648 		    GOT_DIFF_LINE_LOGMSG);
4649 		if (err)
4650 			goto done;
4651 	}
4652 
4653 	err = get_changed_paths(&changed_paths, commit, repo);
4654 	if (err)
4655 		goto done;
4656 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4657 		struct got_diff_changed_path *cp = pe->data;
4658 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4659 		if (n < 0) {
4660 			err = got_error_from_errno("fprintf");
4661 			goto done;
4662 		}
4663 		outoff += n;
4664 		err = add_line_metadata(lines, nlines, outoff,
4665 		    GOT_DIFF_LINE_CHANGES);
4666 		if (err)
4667 			goto done;
4668 		free((char *)pe->path);
4669 		free(pe->data);
4670 	}
4671 
4672 	fputc('\n', outfile);
4673 	outoff++;
4674 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4675 done:
4676 	got_pathlist_free(&changed_paths);
4677 	free(id_str);
4678 	free(logmsg);
4679 	free(refs_str);
4680 	got_object_commit_close(commit);
4681 	if (err) {
4682 		free(*lines);
4683 		*lines = NULL;
4684 		*nlines = 0;
4685 	}
4686 	return err;
4687 }
4688 
4689 static const struct got_error *
4690 create_diff(struct tog_diff_view_state *s)
4691 {
4692 	const struct got_error *err = NULL;
4693 	FILE *f = NULL;
4694 	int obj_type;
4695 
4696 	free(s->lines);
4697 	s->lines = malloc(sizeof(*s->lines));
4698 	if (s->lines == NULL)
4699 		return got_error_from_errno("malloc");
4700 	s->nlines = 0;
4701 
4702 	f = got_opentemp();
4703 	if (f == NULL) {
4704 		err = got_error_from_errno("got_opentemp");
4705 		goto done;
4706 	}
4707 	if (s->f && fclose(s->f) == EOF) {
4708 		err = got_error_from_errno("fclose");
4709 		goto done;
4710 	}
4711 	s->f = f;
4712 
4713 	if (s->id1)
4714 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4715 	else
4716 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4717 	if (err)
4718 		goto done;
4719 
4720 	switch (obj_type) {
4721 	case GOT_OBJ_TYPE_BLOB:
4722 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4723 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4724 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4725 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4726 		break;
4727 	case GOT_OBJ_TYPE_TREE:
4728 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4729 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4730 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4731 		    s->force_text_diff, s->repo, s->f);
4732 		break;
4733 	case GOT_OBJ_TYPE_COMMIT: {
4734 		const struct got_object_id_queue *parent_ids;
4735 		struct got_object_qid *pid;
4736 		struct got_commit_object *commit2;
4737 		struct got_reflist_head *refs;
4738 
4739 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4740 		if (err)
4741 			goto done;
4742 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4743 		/* Show commit info if we're diffing to a parent/root commit. */
4744 		if (s->id1 == NULL) {
4745 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4746 			    refs, s->repo, s->f);
4747 			if (err)
4748 				goto done;
4749 		} else {
4750 			parent_ids = got_object_commit_get_parent_ids(commit2);
4751 			STAILQ_FOREACH(pid, parent_ids, entry) {
4752 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4753 					err = write_commit_info(&s->lines,
4754 					    &s->nlines, s->id2, refs, s->repo,
4755 					    s->f);
4756 					if (err)
4757 						goto done;
4758 					break;
4759 				}
4760 			}
4761 		}
4762 		got_object_commit_close(commit2);
4763 
4764 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4765 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4766 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4767 		    s->force_text_diff, s->repo, s->f);
4768 		break;
4769 	}
4770 	default:
4771 		err = got_error(GOT_ERR_OBJ_TYPE);
4772 		break;
4773 	}
4774 done:
4775 	if (s->f && fflush(s->f) != 0 && err == NULL)
4776 		err = got_error_from_errno("fflush");
4777 	return err;
4778 }
4779 
4780 static void
4781 diff_view_indicate_progress(struct tog_view *view)
4782 {
4783 	mvwaddstr(view->window, 0, 0, "diffing...");
4784 	update_panels();
4785 	doupdate();
4786 }
4787 
4788 static const struct got_error *
4789 search_start_diff_view(struct tog_view *view)
4790 {
4791 	struct tog_diff_view_state *s = &view->state.diff;
4792 
4793 	s->matched_line = 0;
4794 	return NULL;
4795 }
4796 
4797 static void
4798 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4799     size_t *nlines, int **first, int **last, int **match, int **selected)
4800 {
4801 	struct tog_diff_view_state *s = &view->state.diff;
4802 
4803 	*f = s->f;
4804 	*nlines = s->nlines;
4805 	*line_offsets = NULL;
4806 	*match = &s->matched_line;
4807 	*first = &s->first_displayed_line;
4808 	*last = &s->last_displayed_line;
4809 	*selected = &s->selected_line;
4810 }
4811 
4812 static const struct got_error *
4813 search_next_view_match(struct tog_view *view)
4814 {
4815 	const struct got_error *err = NULL;
4816 	FILE *f;
4817 	int lineno;
4818 	char *line = NULL;
4819 	size_t linesize = 0;
4820 	ssize_t linelen;
4821 	off_t *line_offsets;
4822 	size_t nlines = 0;
4823 	int *first, *last, *match, *selected;
4824 
4825 	if (!view->search_setup)
4826 		return got_error_msg(GOT_ERR_NOT_IMPL,
4827 		    "view search not supported");
4828 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4829 	    &match, &selected);
4830 
4831 	if (!view->searching) {
4832 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4833 		return NULL;
4834 	}
4835 
4836 	if (*match) {
4837 		if (view->searching == TOG_SEARCH_FORWARD)
4838 			lineno = *match + 1;
4839 		else
4840 			lineno = *match - 1;
4841 	} else
4842 		lineno = *first - 1 + *selected;
4843 
4844 	while (1) {
4845 		off_t offset;
4846 
4847 		if (lineno <= 0 || lineno > nlines) {
4848 			if (*match == 0) {
4849 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4850 				break;
4851 			}
4852 
4853 			if (view->searching == TOG_SEARCH_FORWARD)
4854 				lineno = 1;
4855 			else
4856 				lineno = nlines;
4857 		}
4858 
4859 		offset = view->type == TOG_VIEW_DIFF ?
4860 		    view->state.diff.lines[lineno - 1].offset :
4861 		    line_offsets[lineno - 1];
4862 		if (fseeko(f, offset, SEEK_SET) != 0) {
4863 			free(line);
4864 			return got_error_from_errno("fseeko");
4865 		}
4866 		linelen = getline(&line, &linesize, f);
4867 		if (linelen != -1) {
4868 			char *exstr;
4869 			err = expand_tab(&exstr, line);
4870 			if (err)
4871 				break;
4872 			if (match_line(exstr, &view->regex, 1,
4873 			    &view->regmatch)) {
4874 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4875 				*match = lineno;
4876 				free(exstr);
4877 				break;
4878 			}
4879 			free(exstr);
4880 		}
4881 		if (view->searching == TOG_SEARCH_FORWARD)
4882 			lineno++;
4883 		else
4884 			lineno--;
4885 	}
4886 	free(line);
4887 
4888 	if (*match) {
4889 		*first = *match;
4890 		*selected = 1;
4891 	}
4892 
4893 	return err;
4894 }
4895 
4896 static const struct got_error *
4897 close_diff_view(struct tog_view *view)
4898 {
4899 	const struct got_error *err = NULL;
4900 	struct tog_diff_view_state *s = &view->state.diff;
4901 
4902 	free(s->id1);
4903 	s->id1 = NULL;
4904 	free(s->id2);
4905 	s->id2 = NULL;
4906 	if (s->f && fclose(s->f) == EOF)
4907 		err = got_error_from_errno("fclose");
4908 	s->f = NULL;
4909 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4910 		err = got_error_from_errno("fclose");
4911 	s->f1 = NULL;
4912 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4913 		err = got_error_from_errno("fclose");
4914 	s->f2 = NULL;
4915 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4916 		err = got_error_from_errno("close");
4917 	s->fd1 = -1;
4918 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4919 		err = got_error_from_errno("close");
4920 	s->fd2 = -1;
4921 	free(s->lines);
4922 	s->lines = NULL;
4923 	s->nlines = 0;
4924 	return err;
4925 }
4926 
4927 static const struct got_error *
4928 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4929     struct got_object_id *id2, const char *label1, const char *label2,
4930     int diff_context, int ignore_whitespace, int force_text_diff,
4931     struct tog_view *parent_view, struct got_repository *repo)
4932 {
4933 	const struct got_error *err;
4934 	struct tog_diff_view_state *s = &view->state.diff;
4935 
4936 	memset(s, 0, sizeof(*s));
4937 	s->fd1 = -1;
4938 	s->fd2 = -1;
4939 
4940 	if (id1 != NULL && id2 != NULL) {
4941 	    int type1, type2;
4942 	    err = got_object_get_type(&type1, repo, id1);
4943 	    if (err)
4944 		return err;
4945 	    err = got_object_get_type(&type2, repo, id2);
4946 	    if (err)
4947 		return err;
4948 
4949 	    if (type1 != type2)
4950 		return got_error(GOT_ERR_OBJ_TYPE);
4951 	}
4952 	s->first_displayed_line = 1;
4953 	s->last_displayed_line = view->nlines;
4954 	s->selected_line = 1;
4955 	s->repo = repo;
4956 	s->id1 = id1;
4957 	s->id2 = id2;
4958 	s->label1 = label1;
4959 	s->label2 = label2;
4960 
4961 	if (id1) {
4962 		s->id1 = got_object_id_dup(id1);
4963 		if (s->id1 == NULL)
4964 			return got_error_from_errno("got_object_id_dup");
4965 	} else
4966 		s->id1 = NULL;
4967 
4968 	s->id2 = got_object_id_dup(id2);
4969 	if (s->id2 == NULL) {
4970 		err = got_error_from_errno("got_object_id_dup");
4971 		goto done;
4972 	}
4973 
4974 	s->f1 = got_opentemp();
4975 	if (s->f1 == NULL) {
4976 		err = got_error_from_errno("got_opentemp");
4977 		goto done;
4978 	}
4979 
4980 	s->f2 = got_opentemp();
4981 	if (s->f2 == NULL) {
4982 		err = got_error_from_errno("got_opentemp");
4983 		goto done;
4984 	}
4985 
4986 	s->fd1 = got_opentempfd();
4987 	if (s->fd1 == -1) {
4988 		err = got_error_from_errno("got_opentempfd");
4989 		goto done;
4990 	}
4991 
4992 	s->fd2 = got_opentempfd();
4993 	if (s->fd2 == -1) {
4994 		err = got_error_from_errno("got_opentempfd");
4995 		goto done;
4996 	}
4997 
4998 	s->first_displayed_line = 1;
4999 	s->last_displayed_line = view->nlines;
5000 	s->diff_context = diff_context;
5001 	s->ignore_whitespace = ignore_whitespace;
5002 	s->force_text_diff = force_text_diff;
5003 	s->parent_view = parent_view;
5004 	s->repo = repo;
5005 
5006 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5007 		int rc;
5008 
5009 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5010 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5011 		if (rc != ERR)
5012 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5013 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5014 		if (rc != ERR)
5015 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5016 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5017 		if (rc != ERR)
5018 			rc = init_pair(GOT_DIFF_LINE_META,
5019 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5020 		if (rc != ERR)
5021 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5022 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5023 		if (rc != ERR)
5024 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5025 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5026 		if (rc != ERR)
5027 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5028 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5029 		if (rc != ERR)
5030 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5031 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5032 		if (rc != ERR)
5033 			rc = init_pair(GOT_DIFF_LINE_DATE,
5034 			    get_color_value("TOG_COLOR_DATE"), -1);
5035 		if (rc == ERR) {
5036 			err = got_error(GOT_ERR_RANGE);
5037 			goto done;
5038 		}
5039 	}
5040 
5041 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5042 	    view_is_splitscreen(view))
5043 		show_log_view(parent_view); /* draw border */
5044 	diff_view_indicate_progress(view);
5045 
5046 	err = create_diff(s);
5047 
5048 	view->show = show_diff_view;
5049 	view->input = input_diff_view;
5050 	view->reset = reset_diff_view;
5051 	view->close = close_diff_view;
5052 	view->search_start = search_start_diff_view;
5053 	view->search_setup = search_setup_diff_view;
5054 	view->search_next = search_next_view_match;
5055 done:
5056 	if (err)
5057 		close_diff_view(view);
5058 	return err;
5059 }
5060 
5061 static const struct got_error *
5062 show_diff_view(struct tog_view *view)
5063 {
5064 	const struct got_error *err;
5065 	struct tog_diff_view_state *s = &view->state.diff;
5066 	char *id_str1 = NULL, *id_str2, *header;
5067 	const char *label1, *label2;
5068 
5069 	if (s->id1) {
5070 		err = got_object_id_str(&id_str1, s->id1);
5071 		if (err)
5072 			return err;
5073 		label1 = s->label1 ? s->label1 : id_str1;
5074 	} else
5075 		label1 = "/dev/null";
5076 
5077 	err = got_object_id_str(&id_str2, s->id2);
5078 	if (err)
5079 		return err;
5080 	label2 = s->label2 ? s->label2 : id_str2;
5081 
5082 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5083 		err = got_error_from_errno("asprintf");
5084 		free(id_str1);
5085 		free(id_str2);
5086 		return err;
5087 	}
5088 	free(id_str1);
5089 	free(id_str2);
5090 
5091 	err = draw_file(view, header);
5092 	free(header);
5093 	return err;
5094 }
5095 
5096 static const struct got_error *
5097 set_selected_commit(struct tog_diff_view_state *s,
5098     struct commit_queue_entry *entry)
5099 {
5100 	const struct got_error *err;
5101 	const struct got_object_id_queue *parent_ids;
5102 	struct got_commit_object *selected_commit;
5103 	struct got_object_qid *pid;
5104 
5105 	free(s->id2);
5106 	s->id2 = got_object_id_dup(entry->id);
5107 	if (s->id2 == NULL)
5108 		return got_error_from_errno("got_object_id_dup");
5109 
5110 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5111 	if (err)
5112 		return err;
5113 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5114 	free(s->id1);
5115 	pid = STAILQ_FIRST(parent_ids);
5116 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5117 	got_object_commit_close(selected_commit);
5118 	return NULL;
5119 }
5120 
5121 static const struct got_error *
5122 reset_diff_view(struct tog_view *view)
5123 {
5124 	struct tog_diff_view_state *s = &view->state.diff;
5125 
5126 	view->count = 0;
5127 	wclear(view->window);
5128 	s->first_displayed_line = 1;
5129 	s->last_displayed_line = view->nlines;
5130 	s->matched_line = 0;
5131 	diff_view_indicate_progress(view);
5132 	return create_diff(s);
5133 }
5134 
5135 static void
5136 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5137 {
5138 	int start, i;
5139 
5140 	i = start = s->first_displayed_line - 1;
5141 
5142 	while (s->lines[i].type != type) {
5143 		if (i == 0)
5144 			i = s->nlines - 1;
5145 		if (--i == start)
5146 			return; /* do nothing, requested type not in file */
5147 	}
5148 
5149 	s->selected_line = 1;
5150 	s->first_displayed_line = i;
5151 }
5152 
5153 static void
5154 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5155 {
5156 	int start, i;
5157 
5158 	i = start = s->first_displayed_line + 1;
5159 
5160 	while (s->lines[i].type != type) {
5161 		if (i == s->nlines - 1)
5162 			i = 0;
5163 		if (++i == start)
5164 			return; /* do nothing, requested type not in file */
5165 	}
5166 
5167 	s->selected_line = 1;
5168 	s->first_displayed_line = i;
5169 }
5170 
5171 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5172     int, int, int);
5173 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5174     int, int);
5175 
5176 static const struct got_error *
5177 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5178 {
5179 	const struct got_error *err = NULL;
5180 	struct tog_diff_view_state *s = &view->state.diff;
5181 	struct tog_log_view_state *ls;
5182 	struct commit_queue_entry *old_selected_entry;
5183 	char *line = NULL;
5184 	size_t linesize = 0;
5185 	ssize_t linelen;
5186 	int i, nscroll = view->nlines - 1, up = 0;
5187 
5188 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5189 
5190 	switch (ch) {
5191 	case '0':
5192 		view->x = 0;
5193 		break;
5194 	case '$':
5195 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5196 		view->count = 0;
5197 		break;
5198 	case KEY_RIGHT:
5199 	case 'l':
5200 		if (view->x + view->ncols / 3 < view->maxx)
5201 			view->x += 2;  /* move two columns right */
5202 		else
5203 			view->count = 0;
5204 		break;
5205 	case KEY_LEFT:
5206 	case 'h':
5207 		view->x -= MIN(view->x, 2);  /* move two columns back */
5208 		if (view->x <= 0)
5209 			view->count = 0;
5210 		break;
5211 	case 'a':
5212 	case 'w':
5213 		if (ch == 'a')
5214 			s->force_text_diff = !s->force_text_diff;
5215 		if (ch == 'w')
5216 			s->ignore_whitespace = !s->ignore_whitespace;
5217 		err = reset_diff_view(view);
5218 		break;
5219 	case 'g':
5220 	case KEY_HOME:
5221 		s->first_displayed_line = 1;
5222 		view->count = 0;
5223 		break;
5224 	case 'G':
5225 	case KEY_END:
5226 		view->count = 0;
5227 		if (s->eof)
5228 			break;
5229 
5230 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5231 		s->eof = 1;
5232 		break;
5233 	case 'k':
5234 	case KEY_UP:
5235 	case CTRL('p'):
5236 		if (s->first_displayed_line > 1)
5237 			s->first_displayed_line--;
5238 		else
5239 			view->count = 0;
5240 		break;
5241 	case CTRL('u'):
5242 	case 'u':
5243 		nscroll /= 2;
5244 		/* FALL THROUGH */
5245 	case KEY_PPAGE:
5246 	case CTRL('b'):
5247 	case 'b':
5248 		if (s->first_displayed_line == 1) {
5249 			view->count = 0;
5250 			break;
5251 		}
5252 		i = 0;
5253 		while (i++ < nscroll && s->first_displayed_line > 1)
5254 			s->first_displayed_line--;
5255 		break;
5256 	case 'j':
5257 	case KEY_DOWN:
5258 	case CTRL('n'):
5259 		if (!s->eof)
5260 			s->first_displayed_line++;
5261 		else
5262 			view->count = 0;
5263 		break;
5264 	case CTRL('d'):
5265 	case 'd':
5266 		nscroll /= 2;
5267 		/* FALL THROUGH */
5268 	case KEY_NPAGE:
5269 	case CTRL('f'):
5270 	case 'f':
5271 	case ' ':
5272 		if (s->eof) {
5273 			view->count = 0;
5274 			break;
5275 		}
5276 		i = 0;
5277 		while (!s->eof && i++ < nscroll) {
5278 			linelen = getline(&line, &linesize, s->f);
5279 			s->first_displayed_line++;
5280 			if (linelen == -1) {
5281 				if (feof(s->f)) {
5282 					s->eof = 1;
5283 				} else
5284 					err = got_ferror(s->f, GOT_ERR_IO);
5285 				break;
5286 			}
5287 		}
5288 		free(line);
5289 		break;
5290 	case '(':
5291 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5292 		break;
5293 	case ')':
5294 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5295 		break;
5296 	case '{':
5297 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5298 		break;
5299 	case '}':
5300 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5301 		break;
5302 	case '[':
5303 		if (s->diff_context > 0) {
5304 			s->diff_context--;
5305 			s->matched_line = 0;
5306 			diff_view_indicate_progress(view);
5307 			err = create_diff(s);
5308 			if (s->first_displayed_line + view->nlines - 1 >
5309 			    s->nlines) {
5310 				s->first_displayed_line = 1;
5311 				s->last_displayed_line = view->nlines;
5312 			}
5313 		} else
5314 			view->count = 0;
5315 		break;
5316 	case ']':
5317 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5318 			s->diff_context++;
5319 			s->matched_line = 0;
5320 			diff_view_indicate_progress(view);
5321 			err = create_diff(s);
5322 		} else
5323 			view->count = 0;
5324 		break;
5325 	case '<':
5326 	case ',':
5327 	case 'K':
5328 		up = 1;
5329 		/* FALL THROUGH */
5330 	case '>':
5331 	case '.':
5332 	case 'J':
5333 		if (s->parent_view == NULL) {
5334 			view->count = 0;
5335 			break;
5336 		}
5337 		s->parent_view->count = view->count;
5338 
5339 		if (s->parent_view->type == TOG_VIEW_LOG) {
5340 			ls = &s->parent_view->state.log;
5341 			old_selected_entry = ls->selected_entry;
5342 
5343 			err = input_log_view(NULL, s->parent_view,
5344 			    up ? KEY_UP : KEY_DOWN);
5345 			if (err)
5346 				break;
5347 			view->count = s->parent_view->count;
5348 
5349 			if (old_selected_entry == ls->selected_entry)
5350 				break;
5351 
5352 			err = set_selected_commit(s, ls->selected_entry);
5353 			if (err)
5354 				break;
5355 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5356 			struct tog_blame_view_state *bs;
5357 			struct got_object_id *id, *prev_id;
5358 
5359 			bs = &s->parent_view->state.blame;
5360 			prev_id = get_annotation_for_line(bs->blame.lines,
5361 			    bs->blame.nlines, bs->last_diffed_line);
5362 
5363 			err = input_blame_view(&view, s->parent_view,
5364 			    up ? KEY_UP : KEY_DOWN);
5365 			if (err)
5366 				break;
5367 			view->count = s->parent_view->count;
5368 
5369 			if (prev_id == NULL)
5370 				break;
5371 			id = get_selected_commit_id(bs->blame.lines,
5372 			    bs->blame.nlines, bs->first_displayed_line,
5373 			    bs->selected_line);
5374 			if (id == NULL)
5375 				break;
5376 
5377 			if (!got_object_id_cmp(prev_id, id))
5378 				break;
5379 
5380 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5381 			if (err)
5382 				break;
5383 		}
5384 		s->first_displayed_line = 1;
5385 		s->last_displayed_line = view->nlines;
5386 		s->matched_line = 0;
5387 		view->x = 0;
5388 
5389 		diff_view_indicate_progress(view);
5390 		err = create_diff(s);
5391 		break;
5392 	default:
5393 		view->count = 0;
5394 		break;
5395 	}
5396 
5397 	return err;
5398 }
5399 
5400 static const struct got_error *
5401 cmd_diff(int argc, char *argv[])
5402 {
5403 	const struct got_error *error = NULL;
5404 	struct got_repository *repo = NULL;
5405 	struct got_worktree *worktree = NULL;
5406 	struct got_object_id *id1 = NULL, *id2 = NULL;
5407 	char *repo_path = NULL, *cwd = NULL;
5408 	char *id_str1 = NULL, *id_str2 = NULL;
5409 	char *label1 = NULL, *label2 = NULL;
5410 	int diff_context = 3, ignore_whitespace = 0;
5411 	int ch, force_text_diff = 0;
5412 	const char *errstr;
5413 	struct tog_view *view;
5414 	int *pack_fds = NULL;
5415 
5416 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5417 		switch (ch) {
5418 		case 'a':
5419 			force_text_diff = 1;
5420 			break;
5421 		case 'C':
5422 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5423 			    &errstr);
5424 			if (errstr != NULL)
5425 				errx(1, "number of context lines is %s: %s",
5426 				    errstr, errstr);
5427 			break;
5428 		case 'r':
5429 			repo_path = realpath(optarg, NULL);
5430 			if (repo_path == NULL)
5431 				return got_error_from_errno2("realpath",
5432 				    optarg);
5433 			got_path_strip_trailing_slashes(repo_path);
5434 			break;
5435 		case 'w':
5436 			ignore_whitespace = 1;
5437 			break;
5438 		default:
5439 			usage_diff();
5440 			/* NOTREACHED */
5441 		}
5442 	}
5443 
5444 	argc -= optind;
5445 	argv += optind;
5446 
5447 	if (argc == 0) {
5448 		usage_diff(); /* TODO show local worktree changes */
5449 	} else if (argc == 2) {
5450 		id_str1 = argv[0];
5451 		id_str2 = argv[1];
5452 	} else
5453 		usage_diff();
5454 
5455 	error = got_repo_pack_fds_open(&pack_fds);
5456 	if (error)
5457 		goto done;
5458 
5459 	if (repo_path == NULL) {
5460 		cwd = getcwd(NULL, 0);
5461 		if (cwd == NULL)
5462 			return got_error_from_errno("getcwd");
5463 		error = got_worktree_open(&worktree, cwd);
5464 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5465 			goto done;
5466 		if (worktree)
5467 			repo_path =
5468 			    strdup(got_worktree_get_repo_path(worktree));
5469 		else
5470 			repo_path = strdup(cwd);
5471 		if (repo_path == NULL) {
5472 			error = got_error_from_errno("strdup");
5473 			goto done;
5474 		}
5475 	}
5476 
5477 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5478 	if (error)
5479 		goto done;
5480 
5481 	init_curses();
5482 
5483 	error = apply_unveil(got_repo_get_path(repo), NULL);
5484 	if (error)
5485 		goto done;
5486 
5487 	error = tog_load_refs(repo, 0);
5488 	if (error)
5489 		goto done;
5490 
5491 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5492 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5493 	if (error)
5494 		goto done;
5495 
5496 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5497 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5498 	if (error)
5499 		goto done;
5500 
5501 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5502 	if (view == NULL) {
5503 		error = got_error_from_errno("view_open");
5504 		goto done;
5505 	}
5506 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5507 	    ignore_whitespace, force_text_diff, NULL,  repo);
5508 	if (error)
5509 		goto done;
5510 	error = view_loop(view);
5511 done:
5512 	free(label1);
5513 	free(label2);
5514 	free(repo_path);
5515 	free(cwd);
5516 	if (repo) {
5517 		const struct got_error *close_err = got_repo_close(repo);
5518 		if (error == NULL)
5519 			error = close_err;
5520 	}
5521 	if (worktree)
5522 		got_worktree_close(worktree);
5523 	if (pack_fds) {
5524 		const struct got_error *pack_err =
5525 		    got_repo_pack_fds_close(pack_fds);
5526 		if (error == NULL)
5527 			error = pack_err;
5528 	}
5529 	tog_free_refs();
5530 	return error;
5531 }
5532 
5533 __dead static void
5534 usage_blame(void)
5535 {
5536 	endwin();
5537 	fprintf(stderr,
5538 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5539 	    getprogname());
5540 	exit(1);
5541 }
5542 
5543 struct tog_blame_line {
5544 	int annotated;
5545 	struct got_object_id *id;
5546 };
5547 
5548 static const struct got_error *
5549 draw_blame(struct tog_view *view)
5550 {
5551 	struct tog_blame_view_state *s = &view->state.blame;
5552 	struct tog_blame *blame = &s->blame;
5553 	regmatch_t *regmatch = &view->regmatch;
5554 	const struct got_error *err;
5555 	int lineno = 0, nprinted = 0;
5556 	char *line = NULL;
5557 	size_t linesize = 0;
5558 	ssize_t linelen;
5559 	wchar_t *wline;
5560 	int width;
5561 	struct tog_blame_line *blame_line;
5562 	struct got_object_id *prev_id = NULL;
5563 	char *id_str;
5564 	struct tog_color *tc;
5565 
5566 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5567 	if (err)
5568 		return err;
5569 
5570 	rewind(blame->f);
5571 	werase(view->window);
5572 
5573 	if (asprintf(&line, "commit %s", id_str) == -1) {
5574 		err = got_error_from_errno("asprintf");
5575 		free(id_str);
5576 		return err;
5577 	}
5578 
5579 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5580 	free(line);
5581 	line = NULL;
5582 	if (err)
5583 		return err;
5584 	if (view_needs_focus_indication(view))
5585 		wstandout(view->window);
5586 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5587 	if (tc)
5588 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5589 	waddwstr(view->window, wline);
5590 	while (width++ < view->ncols)
5591 		waddch(view->window, ' ');
5592 	if (tc)
5593 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5594 	if (view_needs_focus_indication(view))
5595 		wstandend(view->window);
5596 	free(wline);
5597 	wline = NULL;
5598 
5599 	if (view->gline > blame->nlines)
5600 		view->gline = blame->nlines;
5601 
5602 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5603 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5604 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5605 		free(id_str);
5606 		return got_error_from_errno("asprintf");
5607 	}
5608 	free(id_str);
5609 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5610 	free(line);
5611 	line = NULL;
5612 	if (err)
5613 		return err;
5614 	waddwstr(view->window, wline);
5615 	free(wline);
5616 	wline = NULL;
5617 	if (width < view->ncols - 1)
5618 		waddch(view->window, '\n');
5619 
5620 	s->eof = 0;
5621 	view->maxx = 0;
5622 	while (nprinted < view->nlines - 2) {
5623 		linelen = getline(&line, &linesize, blame->f);
5624 		if (linelen == -1) {
5625 			if (feof(blame->f)) {
5626 				s->eof = 1;
5627 				break;
5628 			}
5629 			free(line);
5630 			return got_ferror(blame->f, GOT_ERR_IO);
5631 		}
5632 		if (++lineno < s->first_displayed_line)
5633 			continue;
5634 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5635 			continue;
5636 
5637 		/* Set view->maxx based on full line length. */
5638 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5639 		if (err) {
5640 			free(line);
5641 			return err;
5642 		}
5643 		free(wline);
5644 		wline = NULL;
5645 		view->maxx = MAX(view->maxx, width);
5646 
5647 		if (nprinted == s->selected_line - 1)
5648 			wstandout(view->window);
5649 
5650 		if (blame->nlines > 0) {
5651 			blame_line = &blame->lines[lineno - 1];
5652 			if (blame_line->annotated && prev_id &&
5653 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5654 			    !(nprinted == s->selected_line - 1)) {
5655 				waddstr(view->window, "        ");
5656 			} else if (blame_line->annotated) {
5657 				char *id_str;
5658 				err = got_object_id_str(&id_str,
5659 				    blame_line->id);
5660 				if (err) {
5661 					free(line);
5662 					return err;
5663 				}
5664 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5665 				if (tc)
5666 					wattr_on(view->window,
5667 					    COLOR_PAIR(tc->colorpair), NULL);
5668 				wprintw(view->window, "%.8s", id_str);
5669 				if (tc)
5670 					wattr_off(view->window,
5671 					    COLOR_PAIR(tc->colorpair), NULL);
5672 				free(id_str);
5673 				prev_id = blame_line->id;
5674 			} else {
5675 				waddstr(view->window, "........");
5676 				prev_id = NULL;
5677 			}
5678 		} else {
5679 			waddstr(view->window, "........");
5680 			prev_id = NULL;
5681 		}
5682 
5683 		if (nprinted == s->selected_line - 1)
5684 			wstandend(view->window);
5685 		waddstr(view->window, " ");
5686 
5687 		if (view->ncols <= 9) {
5688 			width = 9;
5689 		} else if (s->first_displayed_line + nprinted ==
5690 		    s->matched_line &&
5691 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5692 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5693 			    view->window, view->x, regmatch);
5694 			if (err) {
5695 				free(line);
5696 				return err;
5697 			}
5698 			width += 9;
5699 		} else {
5700 			int skip;
5701 			err = format_line(&wline, &width, &skip, line,
5702 			    view->x, view->ncols - 9, 9, 1);
5703 			if (err) {
5704 				free(line);
5705 				return err;
5706 			}
5707 			waddwstr(view->window, &wline[skip]);
5708 			width += 9;
5709 			free(wline);
5710 			wline = NULL;
5711 		}
5712 
5713 		if (width <= view->ncols - 1)
5714 			waddch(view->window, '\n');
5715 		if (++nprinted == 1)
5716 			s->first_displayed_line = lineno;
5717 	}
5718 	free(line);
5719 	s->last_displayed_line = lineno;
5720 
5721 	view_border(view);
5722 
5723 	return NULL;
5724 }
5725 
5726 static const struct got_error *
5727 blame_cb(void *arg, int nlines, int lineno,
5728     struct got_commit_object *commit, struct got_object_id *id)
5729 {
5730 	const struct got_error *err = NULL;
5731 	struct tog_blame_cb_args *a = arg;
5732 	struct tog_blame_line *line;
5733 	int errcode;
5734 
5735 	if (nlines != a->nlines ||
5736 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5737 		return got_error(GOT_ERR_RANGE);
5738 
5739 	errcode = pthread_mutex_lock(&tog_mutex);
5740 	if (errcode)
5741 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5742 
5743 	if (*a->quit) {	/* user has quit the blame view */
5744 		err = got_error(GOT_ERR_ITER_COMPLETED);
5745 		goto done;
5746 	}
5747 
5748 	if (lineno == -1)
5749 		goto done; /* no change in this commit */
5750 
5751 	line = &a->lines[lineno - 1];
5752 	if (line->annotated)
5753 		goto done;
5754 
5755 	line->id = got_object_id_dup(id);
5756 	if (line->id == NULL) {
5757 		err = got_error_from_errno("got_object_id_dup");
5758 		goto done;
5759 	}
5760 	line->annotated = 1;
5761 done:
5762 	errcode = pthread_mutex_unlock(&tog_mutex);
5763 	if (errcode)
5764 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5765 	return err;
5766 }
5767 
5768 static void *
5769 blame_thread(void *arg)
5770 {
5771 	const struct got_error *err, *close_err;
5772 	struct tog_blame_thread_args *ta = arg;
5773 	struct tog_blame_cb_args *a = ta->cb_args;
5774 	int errcode, fd1 = -1, fd2 = -1;
5775 	FILE *f1 = NULL, *f2 = NULL;
5776 
5777 	fd1 = got_opentempfd();
5778 	if (fd1 == -1)
5779 		return (void *)got_error_from_errno("got_opentempfd");
5780 
5781 	fd2 = got_opentempfd();
5782 	if (fd2 == -1) {
5783 		err = got_error_from_errno("got_opentempfd");
5784 		goto done;
5785 	}
5786 
5787 	f1 = got_opentemp();
5788 	if (f1 == NULL) {
5789 		err = (void *)got_error_from_errno("got_opentemp");
5790 		goto done;
5791 	}
5792 	f2 = got_opentemp();
5793 	if (f2 == NULL) {
5794 		err = (void *)got_error_from_errno("got_opentemp");
5795 		goto done;
5796 	}
5797 
5798 	err = block_signals_used_by_main_thread();
5799 	if (err)
5800 		goto done;
5801 
5802 	err = got_blame(ta->path, a->commit_id, ta->repo,
5803 	    tog_diff_algo, blame_cb, ta->cb_args,
5804 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5805 	if (err && err->code == GOT_ERR_CANCELLED)
5806 		err = NULL;
5807 
5808 	errcode = pthread_mutex_lock(&tog_mutex);
5809 	if (errcode) {
5810 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5811 		goto done;
5812 	}
5813 
5814 	close_err = got_repo_close(ta->repo);
5815 	if (err == NULL)
5816 		err = close_err;
5817 	ta->repo = NULL;
5818 	*ta->complete = 1;
5819 
5820 	errcode = pthread_mutex_unlock(&tog_mutex);
5821 	if (errcode && err == NULL)
5822 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5823 
5824 done:
5825 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5826 		err = got_error_from_errno("close");
5827 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5828 		err = got_error_from_errno("close");
5829 	if (f1 && fclose(f1) == EOF && err == NULL)
5830 		err = got_error_from_errno("fclose");
5831 	if (f2 && fclose(f2) == EOF && err == NULL)
5832 		err = got_error_from_errno("fclose");
5833 
5834 	return (void *)err;
5835 }
5836 
5837 static struct got_object_id *
5838 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5839     int first_displayed_line, int selected_line)
5840 {
5841 	struct tog_blame_line *line;
5842 
5843 	if (nlines <= 0)
5844 		return NULL;
5845 
5846 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5847 	if (!line->annotated)
5848 		return NULL;
5849 
5850 	return line->id;
5851 }
5852 
5853 static struct got_object_id *
5854 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5855     int lineno)
5856 {
5857 	struct tog_blame_line *line;
5858 
5859 	if (nlines <= 0 || lineno >= nlines)
5860 		return NULL;
5861 
5862 	line = &lines[lineno - 1];
5863 	if (!line->annotated)
5864 		return NULL;
5865 
5866 	return line->id;
5867 }
5868 
5869 static const struct got_error *
5870 stop_blame(struct tog_blame *blame)
5871 {
5872 	const struct got_error *err = NULL;
5873 	int i;
5874 
5875 	if (blame->thread) {
5876 		int errcode;
5877 		errcode = pthread_mutex_unlock(&tog_mutex);
5878 		if (errcode)
5879 			return got_error_set_errno(errcode,
5880 			    "pthread_mutex_unlock");
5881 		errcode = pthread_join(blame->thread, (void **)&err);
5882 		if (errcode)
5883 			return got_error_set_errno(errcode, "pthread_join");
5884 		errcode = pthread_mutex_lock(&tog_mutex);
5885 		if (errcode)
5886 			return got_error_set_errno(errcode,
5887 			    "pthread_mutex_lock");
5888 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5889 			err = NULL;
5890 		blame->thread = NULL;
5891 	}
5892 	if (blame->thread_args.repo) {
5893 		const struct got_error *close_err;
5894 		close_err = got_repo_close(blame->thread_args.repo);
5895 		if (err == NULL)
5896 			err = close_err;
5897 		blame->thread_args.repo = NULL;
5898 	}
5899 	if (blame->f) {
5900 		if (fclose(blame->f) == EOF && err == NULL)
5901 			err = got_error_from_errno("fclose");
5902 		blame->f = NULL;
5903 	}
5904 	if (blame->lines) {
5905 		for (i = 0; i < blame->nlines; i++)
5906 			free(blame->lines[i].id);
5907 		free(blame->lines);
5908 		blame->lines = NULL;
5909 	}
5910 	free(blame->cb_args.commit_id);
5911 	blame->cb_args.commit_id = NULL;
5912 	if (blame->pack_fds) {
5913 		const struct got_error *pack_err =
5914 		    got_repo_pack_fds_close(blame->pack_fds);
5915 		if (err == NULL)
5916 			err = pack_err;
5917 		blame->pack_fds = NULL;
5918 	}
5919 	return err;
5920 }
5921 
5922 static const struct got_error *
5923 cancel_blame_view(void *arg)
5924 {
5925 	const struct got_error *err = NULL;
5926 	int *done = arg;
5927 	int errcode;
5928 
5929 	errcode = pthread_mutex_lock(&tog_mutex);
5930 	if (errcode)
5931 		return got_error_set_errno(errcode,
5932 		    "pthread_mutex_unlock");
5933 
5934 	if (*done)
5935 		err = got_error(GOT_ERR_CANCELLED);
5936 
5937 	errcode = pthread_mutex_unlock(&tog_mutex);
5938 	if (errcode)
5939 		return got_error_set_errno(errcode,
5940 		    "pthread_mutex_lock");
5941 
5942 	return err;
5943 }
5944 
5945 static const struct got_error *
5946 run_blame(struct tog_view *view)
5947 {
5948 	struct tog_blame_view_state *s = &view->state.blame;
5949 	struct tog_blame *blame = &s->blame;
5950 	const struct got_error *err = NULL;
5951 	struct got_commit_object *commit = NULL;
5952 	struct got_blob_object *blob = NULL;
5953 	struct got_repository *thread_repo = NULL;
5954 	struct got_object_id *obj_id = NULL;
5955 	int obj_type, fd = -1;
5956 	int *pack_fds = NULL;
5957 
5958 	err = got_object_open_as_commit(&commit, s->repo,
5959 	    &s->blamed_commit->id);
5960 	if (err)
5961 		return err;
5962 
5963 	fd = got_opentempfd();
5964 	if (fd == -1) {
5965 		err = got_error_from_errno("got_opentempfd");
5966 		goto done;
5967 	}
5968 
5969 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5970 	if (err)
5971 		goto done;
5972 
5973 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5974 	if (err)
5975 		goto done;
5976 
5977 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5978 		err = got_error(GOT_ERR_OBJ_TYPE);
5979 		goto done;
5980 	}
5981 
5982 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5983 	if (err)
5984 		goto done;
5985 	blame->f = got_opentemp();
5986 	if (blame->f == NULL) {
5987 		err = got_error_from_errno("got_opentemp");
5988 		goto done;
5989 	}
5990 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5991 	    &blame->line_offsets, blame->f, blob);
5992 	if (err)
5993 		goto done;
5994 	if (blame->nlines == 0) {
5995 		s->blame_complete = 1;
5996 		goto done;
5997 	}
5998 
5999 	/* Don't include \n at EOF in the blame line count. */
6000 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6001 		blame->nlines--;
6002 
6003 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6004 	if (blame->lines == NULL) {
6005 		err = got_error_from_errno("calloc");
6006 		goto done;
6007 	}
6008 
6009 	err = got_repo_pack_fds_open(&pack_fds);
6010 	if (err)
6011 		goto done;
6012 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6013 	    pack_fds);
6014 	if (err)
6015 		goto done;
6016 
6017 	blame->pack_fds = pack_fds;
6018 	blame->cb_args.view = view;
6019 	blame->cb_args.lines = blame->lines;
6020 	blame->cb_args.nlines = blame->nlines;
6021 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6022 	if (blame->cb_args.commit_id == NULL) {
6023 		err = got_error_from_errno("got_object_id_dup");
6024 		goto done;
6025 	}
6026 	blame->cb_args.quit = &s->done;
6027 
6028 	blame->thread_args.path = s->path;
6029 	blame->thread_args.repo = thread_repo;
6030 	blame->thread_args.cb_args = &blame->cb_args;
6031 	blame->thread_args.complete = &s->blame_complete;
6032 	blame->thread_args.cancel_cb = cancel_blame_view;
6033 	blame->thread_args.cancel_arg = &s->done;
6034 	s->blame_complete = 0;
6035 
6036 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6037 		s->first_displayed_line = 1;
6038 		s->last_displayed_line = view->nlines;
6039 		s->selected_line = 1;
6040 	}
6041 	s->matched_line = 0;
6042 
6043 done:
6044 	if (commit)
6045 		got_object_commit_close(commit);
6046 	if (fd != -1 && close(fd) == -1 && err == NULL)
6047 		err = got_error_from_errno("close");
6048 	if (blob)
6049 		got_object_blob_close(blob);
6050 	free(obj_id);
6051 	if (err)
6052 		stop_blame(blame);
6053 	return err;
6054 }
6055 
6056 static const struct got_error *
6057 open_blame_view(struct tog_view *view, char *path,
6058     struct got_object_id *commit_id, struct got_repository *repo)
6059 {
6060 	const struct got_error *err = NULL;
6061 	struct tog_blame_view_state *s = &view->state.blame;
6062 
6063 	STAILQ_INIT(&s->blamed_commits);
6064 
6065 	s->path = strdup(path);
6066 	if (s->path == NULL)
6067 		return got_error_from_errno("strdup");
6068 
6069 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6070 	if (err) {
6071 		free(s->path);
6072 		return err;
6073 	}
6074 
6075 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6076 	s->first_displayed_line = 1;
6077 	s->last_displayed_line = view->nlines;
6078 	s->selected_line = 1;
6079 	s->blame_complete = 0;
6080 	s->repo = repo;
6081 	s->commit_id = commit_id;
6082 	memset(&s->blame, 0, sizeof(s->blame));
6083 
6084 	STAILQ_INIT(&s->colors);
6085 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6086 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6087 		    get_color_value("TOG_COLOR_COMMIT"));
6088 		if (err)
6089 			return err;
6090 	}
6091 
6092 	view->show = show_blame_view;
6093 	view->input = input_blame_view;
6094 	view->reset = reset_blame_view;
6095 	view->close = close_blame_view;
6096 	view->search_start = search_start_blame_view;
6097 	view->search_setup = search_setup_blame_view;
6098 	view->search_next = search_next_view_match;
6099 
6100 	return run_blame(view);
6101 }
6102 
6103 static const struct got_error *
6104 close_blame_view(struct tog_view *view)
6105 {
6106 	const struct got_error *err = NULL;
6107 	struct tog_blame_view_state *s = &view->state.blame;
6108 
6109 	if (s->blame.thread)
6110 		err = stop_blame(&s->blame);
6111 
6112 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6113 		struct got_object_qid *blamed_commit;
6114 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6115 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6116 		got_object_qid_free(blamed_commit);
6117 	}
6118 
6119 	free(s->path);
6120 	free_colors(&s->colors);
6121 	return err;
6122 }
6123 
6124 static const struct got_error *
6125 search_start_blame_view(struct tog_view *view)
6126 {
6127 	struct tog_blame_view_state *s = &view->state.blame;
6128 
6129 	s->matched_line = 0;
6130 	return NULL;
6131 }
6132 
6133 static void
6134 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6135     size_t *nlines, int **first, int **last, int **match, int **selected)
6136 {
6137 	struct tog_blame_view_state *s = &view->state.blame;
6138 
6139 	*f = s->blame.f;
6140 	*nlines = s->blame.nlines;
6141 	*line_offsets = s->blame.line_offsets;
6142 	*match = &s->matched_line;
6143 	*first = &s->first_displayed_line;
6144 	*last = &s->last_displayed_line;
6145 	*selected = &s->selected_line;
6146 }
6147 
6148 static const struct got_error *
6149 show_blame_view(struct tog_view *view)
6150 {
6151 	const struct got_error *err = NULL;
6152 	struct tog_blame_view_state *s = &view->state.blame;
6153 	int errcode;
6154 
6155 	if (s->blame.thread == NULL && !s->blame_complete) {
6156 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6157 		    &s->blame.thread_args);
6158 		if (errcode)
6159 			return got_error_set_errno(errcode, "pthread_create");
6160 
6161 		halfdelay(1); /* fast refresh while annotating  */
6162 	}
6163 
6164 	if (s->blame_complete)
6165 		halfdelay(10); /* disable fast refresh */
6166 
6167 	err = draw_blame(view);
6168 
6169 	view_border(view);
6170 	return err;
6171 }
6172 
6173 static const struct got_error *
6174 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6175     struct got_repository *repo, struct got_object_id *id)
6176 {
6177 	struct tog_view		*log_view;
6178 	const struct got_error	*err = NULL;
6179 
6180 	*new_view = NULL;
6181 
6182 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6183 	if (log_view == NULL)
6184 		return got_error_from_errno("view_open");
6185 
6186 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6187 	if (err)
6188 		view_close(log_view);
6189 	else
6190 		*new_view = log_view;
6191 
6192 	return err;
6193 }
6194 
6195 static const struct got_error *
6196 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6197 {
6198 	const struct got_error *err = NULL, *thread_err = NULL;
6199 	struct tog_view *diff_view;
6200 	struct tog_blame_view_state *s = &view->state.blame;
6201 	int eos, nscroll, begin_y = 0, begin_x = 0;
6202 
6203 	eos = nscroll = view->nlines - 2;
6204 	if (view_is_hsplit_top(view))
6205 		--eos;  /* border */
6206 
6207 	switch (ch) {
6208 	case '0':
6209 		view->x = 0;
6210 		break;
6211 	case '$':
6212 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6213 		view->count = 0;
6214 		break;
6215 	case KEY_RIGHT:
6216 	case 'l':
6217 		if (view->x + view->ncols / 3 < view->maxx)
6218 			view->x += 2;  /* move two columns right */
6219 		else
6220 			view->count = 0;
6221 		break;
6222 	case KEY_LEFT:
6223 	case 'h':
6224 		view->x -= MIN(view->x, 2);  /* move two columns back */
6225 		if (view->x <= 0)
6226 			view->count = 0;
6227 		break;
6228 	case 'q':
6229 		s->done = 1;
6230 		break;
6231 	case 'g':
6232 	case KEY_HOME:
6233 		s->selected_line = 1;
6234 		s->first_displayed_line = 1;
6235 		view->count = 0;
6236 		break;
6237 	case 'G':
6238 	case KEY_END:
6239 		if (s->blame.nlines < eos) {
6240 			s->selected_line = s->blame.nlines;
6241 			s->first_displayed_line = 1;
6242 		} else {
6243 			s->selected_line = eos;
6244 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6245 		}
6246 		view->count = 0;
6247 		break;
6248 	case 'k':
6249 	case KEY_UP:
6250 	case CTRL('p'):
6251 		if (s->selected_line > 1)
6252 			s->selected_line--;
6253 		else if (s->selected_line == 1 &&
6254 		    s->first_displayed_line > 1)
6255 			s->first_displayed_line--;
6256 		else
6257 			view->count = 0;
6258 		break;
6259 	case CTRL('u'):
6260 	case 'u':
6261 		nscroll /= 2;
6262 		/* FALL THROUGH */
6263 	case KEY_PPAGE:
6264 	case CTRL('b'):
6265 	case 'b':
6266 		if (s->first_displayed_line == 1) {
6267 			if (view->count > 1)
6268 				nscroll += nscroll;
6269 			s->selected_line = MAX(1, s->selected_line - nscroll);
6270 			view->count = 0;
6271 			break;
6272 		}
6273 		if (s->first_displayed_line > nscroll)
6274 			s->first_displayed_line -= nscroll;
6275 		else
6276 			s->first_displayed_line = 1;
6277 		break;
6278 	case 'j':
6279 	case KEY_DOWN:
6280 	case CTRL('n'):
6281 		if (s->selected_line < eos && s->first_displayed_line +
6282 		    s->selected_line <= s->blame.nlines)
6283 			s->selected_line++;
6284 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6285 			s->first_displayed_line++;
6286 		else
6287 			view->count = 0;
6288 		break;
6289 	case 'c':
6290 	case 'p': {
6291 		struct got_object_id *id = NULL;
6292 
6293 		view->count = 0;
6294 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6295 		    s->first_displayed_line, s->selected_line);
6296 		if (id == NULL)
6297 			break;
6298 		if (ch == 'p') {
6299 			struct got_commit_object *commit, *pcommit;
6300 			struct got_object_qid *pid;
6301 			struct got_object_id *blob_id = NULL;
6302 			int obj_type;
6303 			err = got_object_open_as_commit(&commit,
6304 			    s->repo, id);
6305 			if (err)
6306 				break;
6307 			pid = STAILQ_FIRST(
6308 			    got_object_commit_get_parent_ids(commit));
6309 			if (pid == NULL) {
6310 				got_object_commit_close(commit);
6311 				break;
6312 			}
6313 			/* Check if path history ends here. */
6314 			err = got_object_open_as_commit(&pcommit,
6315 			    s->repo, &pid->id);
6316 			if (err)
6317 				break;
6318 			err = got_object_id_by_path(&blob_id, s->repo,
6319 			    pcommit, s->path);
6320 			got_object_commit_close(pcommit);
6321 			if (err) {
6322 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6323 					err = NULL;
6324 				got_object_commit_close(commit);
6325 				break;
6326 			}
6327 			err = got_object_get_type(&obj_type, s->repo,
6328 			    blob_id);
6329 			free(blob_id);
6330 			/* Can't blame non-blob type objects. */
6331 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6332 				got_object_commit_close(commit);
6333 				break;
6334 			}
6335 			err = got_object_qid_alloc(&s->blamed_commit,
6336 			    &pid->id);
6337 			got_object_commit_close(commit);
6338 		} else {
6339 			if (got_object_id_cmp(id,
6340 			    &s->blamed_commit->id) == 0)
6341 				break;
6342 			err = got_object_qid_alloc(&s->blamed_commit,
6343 			    id);
6344 		}
6345 		if (err)
6346 			break;
6347 		s->done = 1;
6348 		thread_err = stop_blame(&s->blame);
6349 		s->done = 0;
6350 		if (thread_err)
6351 			break;
6352 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6353 		    s->blamed_commit, entry);
6354 		err = run_blame(view);
6355 		if (err)
6356 			break;
6357 		break;
6358 	}
6359 	case 'C': {
6360 		struct got_object_qid *first;
6361 
6362 		view->count = 0;
6363 		first = STAILQ_FIRST(&s->blamed_commits);
6364 		if (!got_object_id_cmp(&first->id, s->commit_id))
6365 			break;
6366 		s->done = 1;
6367 		thread_err = stop_blame(&s->blame);
6368 		s->done = 0;
6369 		if (thread_err)
6370 			break;
6371 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6372 		got_object_qid_free(s->blamed_commit);
6373 		s->blamed_commit =
6374 		    STAILQ_FIRST(&s->blamed_commits);
6375 		err = run_blame(view);
6376 		if (err)
6377 			break;
6378 		break;
6379 	}
6380 	case 'L':
6381 		view->count = 0;
6382 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6383 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6384 		if (s->id_to_log)
6385 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6386 		break;
6387 	case KEY_ENTER:
6388 	case '\r': {
6389 		struct got_object_id *id = NULL;
6390 		struct got_object_qid *pid;
6391 		struct got_commit_object *commit = NULL;
6392 
6393 		view->count = 0;
6394 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6395 		    s->first_displayed_line, s->selected_line);
6396 		if (id == NULL)
6397 			break;
6398 		err = got_object_open_as_commit(&commit, s->repo, id);
6399 		if (err)
6400 			break;
6401 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6402 		if (*new_view) {
6403 			/* traversed from diff view, release diff resources  */
6404 			err = close_diff_view(*new_view);
6405 			if (err)
6406 				break;
6407 			diff_view = *new_view;
6408 		} else {
6409 			if (view_is_parent_view(view))
6410 				view_get_split(view, &begin_y, &begin_x);
6411 
6412 			diff_view = view_open(0, 0, begin_y, begin_x,
6413 			    TOG_VIEW_DIFF);
6414 			if (diff_view == NULL) {
6415 				got_object_commit_close(commit);
6416 				err = got_error_from_errno("view_open");
6417 				break;
6418 			}
6419 		}
6420 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6421 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6422 		got_object_commit_close(commit);
6423 		if (err) {
6424 			view_close(diff_view);
6425 			break;
6426 		}
6427 		s->last_diffed_line = s->first_displayed_line - 1 +
6428 		    s->selected_line;
6429 		if (*new_view)
6430 			break;	/* still open from active diff view */
6431 		if (view_is_parent_view(view) &&
6432 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6433 			err = view_init_hsplit(view, begin_y);
6434 			if (err)
6435 				break;
6436 		}
6437 
6438 		view->focussed = 0;
6439 		diff_view->focussed = 1;
6440 		diff_view->mode = view->mode;
6441 		diff_view->nlines = view->lines - begin_y;
6442 		if (view_is_parent_view(view)) {
6443 			view_transfer_size(diff_view, view);
6444 			err = view_close_child(view);
6445 			if (err)
6446 				break;
6447 			err = view_set_child(view, diff_view);
6448 			if (err)
6449 				break;
6450 			view->focus_child = 1;
6451 		} else
6452 			*new_view = diff_view;
6453 		if (err)
6454 			break;
6455 		break;
6456 	}
6457 	case CTRL('d'):
6458 	case 'd':
6459 		nscroll /= 2;
6460 		/* FALL THROUGH */
6461 	case KEY_NPAGE:
6462 	case CTRL('f'):
6463 	case 'f':
6464 	case ' ':
6465 		if (s->last_displayed_line >= s->blame.nlines &&
6466 		    s->selected_line >= MIN(s->blame.nlines,
6467 		    view->nlines - 2)) {
6468 			view->count = 0;
6469 			break;
6470 		}
6471 		if (s->last_displayed_line >= s->blame.nlines &&
6472 		    s->selected_line < view->nlines - 2) {
6473 			s->selected_line +=
6474 			    MIN(nscroll, s->last_displayed_line -
6475 			    s->first_displayed_line - s->selected_line + 1);
6476 		}
6477 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6478 			s->first_displayed_line += nscroll;
6479 		else
6480 			s->first_displayed_line =
6481 			    s->blame.nlines - (view->nlines - 3);
6482 		break;
6483 	case KEY_RESIZE:
6484 		if (s->selected_line > view->nlines - 2) {
6485 			s->selected_line = MIN(s->blame.nlines,
6486 			    view->nlines - 2);
6487 		}
6488 		break;
6489 	default:
6490 		view->count = 0;
6491 		break;
6492 	}
6493 	return thread_err ? thread_err : err;
6494 }
6495 
6496 static const struct got_error *
6497 reset_blame_view(struct tog_view *view)
6498 {
6499 	const struct got_error *err;
6500 	struct tog_blame_view_state *s = &view->state.blame;
6501 
6502 	view->count = 0;
6503 	s->done = 1;
6504 	err = stop_blame(&s->blame);
6505 	s->done = 0;
6506 	if (err)
6507 		return err;
6508 	return run_blame(view);
6509 }
6510 
6511 static const struct got_error *
6512 cmd_blame(int argc, char *argv[])
6513 {
6514 	const struct got_error *error;
6515 	struct got_repository *repo = NULL;
6516 	struct got_worktree *worktree = NULL;
6517 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6518 	char *link_target = NULL;
6519 	struct got_object_id *commit_id = NULL;
6520 	struct got_commit_object *commit = NULL;
6521 	char *commit_id_str = NULL;
6522 	int ch;
6523 	struct tog_view *view;
6524 	int *pack_fds = NULL;
6525 
6526 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6527 		switch (ch) {
6528 		case 'c':
6529 			commit_id_str = optarg;
6530 			break;
6531 		case 'r':
6532 			repo_path = realpath(optarg, NULL);
6533 			if (repo_path == NULL)
6534 				return got_error_from_errno2("realpath",
6535 				    optarg);
6536 			break;
6537 		default:
6538 			usage_blame();
6539 			/* NOTREACHED */
6540 		}
6541 	}
6542 
6543 	argc -= optind;
6544 	argv += optind;
6545 
6546 	if (argc != 1)
6547 		usage_blame();
6548 
6549 	error = got_repo_pack_fds_open(&pack_fds);
6550 	if (error != NULL)
6551 		goto done;
6552 
6553 	if (repo_path == NULL) {
6554 		cwd = getcwd(NULL, 0);
6555 		if (cwd == NULL)
6556 			return got_error_from_errno("getcwd");
6557 		error = got_worktree_open(&worktree, cwd);
6558 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6559 			goto done;
6560 		if (worktree)
6561 			repo_path =
6562 			    strdup(got_worktree_get_repo_path(worktree));
6563 		else
6564 			repo_path = strdup(cwd);
6565 		if (repo_path == NULL) {
6566 			error = got_error_from_errno("strdup");
6567 			goto done;
6568 		}
6569 	}
6570 
6571 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6572 	if (error != NULL)
6573 		goto done;
6574 
6575 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6576 	    worktree);
6577 	if (error)
6578 		goto done;
6579 
6580 	init_curses();
6581 
6582 	error = apply_unveil(got_repo_get_path(repo), NULL);
6583 	if (error)
6584 		goto done;
6585 
6586 	error = tog_load_refs(repo, 0);
6587 	if (error)
6588 		goto done;
6589 
6590 	if (commit_id_str == NULL) {
6591 		struct got_reference *head_ref;
6592 		error = got_ref_open(&head_ref, repo, worktree ?
6593 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6594 		if (error != NULL)
6595 			goto done;
6596 		error = got_ref_resolve(&commit_id, repo, head_ref);
6597 		got_ref_close(head_ref);
6598 	} else {
6599 		error = got_repo_match_object_id(&commit_id, NULL,
6600 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6601 	}
6602 	if (error != NULL)
6603 		goto done;
6604 
6605 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6606 	if (view == NULL) {
6607 		error = got_error_from_errno("view_open");
6608 		goto done;
6609 	}
6610 
6611 	error = got_object_open_as_commit(&commit, repo, commit_id);
6612 	if (error)
6613 		goto done;
6614 
6615 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6616 	    commit, repo);
6617 	if (error)
6618 		goto done;
6619 
6620 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6621 	    commit_id, repo);
6622 	if (error)
6623 		goto done;
6624 	if (worktree) {
6625 		/* Release work tree lock. */
6626 		got_worktree_close(worktree);
6627 		worktree = NULL;
6628 	}
6629 	error = view_loop(view);
6630 done:
6631 	free(repo_path);
6632 	free(in_repo_path);
6633 	free(link_target);
6634 	free(cwd);
6635 	free(commit_id);
6636 	if (commit)
6637 		got_object_commit_close(commit);
6638 	if (worktree)
6639 		got_worktree_close(worktree);
6640 	if (repo) {
6641 		const struct got_error *close_err = got_repo_close(repo);
6642 		if (error == NULL)
6643 			error = close_err;
6644 	}
6645 	if (pack_fds) {
6646 		const struct got_error *pack_err =
6647 		    got_repo_pack_fds_close(pack_fds);
6648 		if (error == NULL)
6649 			error = pack_err;
6650 	}
6651 	tog_free_refs();
6652 	return error;
6653 }
6654 
6655 static const struct got_error *
6656 draw_tree_entries(struct tog_view *view, const char *parent_path)
6657 {
6658 	struct tog_tree_view_state *s = &view->state.tree;
6659 	const struct got_error *err = NULL;
6660 	struct got_tree_entry *te;
6661 	wchar_t *wline;
6662 	char *index = NULL;
6663 	struct tog_color *tc;
6664 	int width, n, nentries, i = 1;
6665 	int limit = view->nlines;
6666 
6667 	s->ndisplayed = 0;
6668 	if (view_is_hsplit_top(view))
6669 		--limit;  /* border */
6670 
6671 	werase(view->window);
6672 
6673 	if (limit == 0)
6674 		return NULL;
6675 
6676 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6677 	    0, 0);
6678 	if (err)
6679 		return err;
6680 	if (view_needs_focus_indication(view))
6681 		wstandout(view->window);
6682 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6683 	if (tc)
6684 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6685 	waddwstr(view->window, wline);
6686 	free(wline);
6687 	wline = NULL;
6688 	while (width++ < view->ncols)
6689 		waddch(view->window, ' ');
6690 	if (tc)
6691 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6692 	if (view_needs_focus_indication(view))
6693 		wstandend(view->window);
6694 	if (--limit <= 0)
6695 		return NULL;
6696 
6697 	i += s->selected;
6698 	if (s->first_displayed_entry) {
6699 		i += got_tree_entry_get_index(s->first_displayed_entry);
6700 		if (s->tree != s->root)
6701 			++i;  /* account for ".." entry */
6702 	}
6703 	nentries = got_object_tree_get_nentries(s->tree);
6704 	if (asprintf(&index, "[%d/%d] %s",
6705 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6706 		return got_error_from_errno("asprintf");
6707 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6708 	free(index);
6709 	if (err)
6710 		return err;
6711 	waddwstr(view->window, wline);
6712 	free(wline);
6713 	wline = NULL;
6714 	if (width < view->ncols - 1)
6715 		waddch(view->window, '\n');
6716 	if (--limit <= 0)
6717 		return NULL;
6718 	waddch(view->window, '\n');
6719 	if (--limit <= 0)
6720 		return NULL;
6721 
6722 	if (s->first_displayed_entry == NULL) {
6723 		te = got_object_tree_get_first_entry(s->tree);
6724 		if (s->selected == 0) {
6725 			if (view->focussed)
6726 				wstandout(view->window);
6727 			s->selected_entry = NULL;
6728 		}
6729 		waddstr(view->window, "  ..\n");	/* parent directory */
6730 		if (s->selected == 0 && view->focussed)
6731 			wstandend(view->window);
6732 		s->ndisplayed++;
6733 		if (--limit <= 0)
6734 			return NULL;
6735 		n = 1;
6736 	} else {
6737 		n = 0;
6738 		te = s->first_displayed_entry;
6739 	}
6740 
6741 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6742 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6743 		const char *modestr = "";
6744 		mode_t mode;
6745 
6746 		te = got_object_tree_get_entry(s->tree, i);
6747 		mode = got_tree_entry_get_mode(te);
6748 
6749 		if (s->show_ids) {
6750 			err = got_object_id_str(&id_str,
6751 			    got_tree_entry_get_id(te));
6752 			if (err)
6753 				return got_error_from_errno(
6754 				    "got_object_id_str");
6755 		}
6756 		if (got_object_tree_entry_is_submodule(te))
6757 			modestr = "$";
6758 		else if (S_ISLNK(mode)) {
6759 			int i;
6760 
6761 			err = got_tree_entry_get_symlink_target(&link_target,
6762 			    te, s->repo);
6763 			if (err) {
6764 				free(id_str);
6765 				return err;
6766 			}
6767 			for (i = 0; i < strlen(link_target); i++) {
6768 				if (!isprint((unsigned char)link_target[i]))
6769 					link_target[i] = '?';
6770 			}
6771 			modestr = "@";
6772 		}
6773 		else if (S_ISDIR(mode))
6774 			modestr = "/";
6775 		else if (mode & S_IXUSR)
6776 			modestr = "*";
6777 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6778 		    got_tree_entry_get_name(te), modestr,
6779 		    link_target ? " -> ": "",
6780 		    link_target ? link_target : "") == -1) {
6781 			free(id_str);
6782 			free(link_target);
6783 			return got_error_from_errno("asprintf");
6784 		}
6785 		free(id_str);
6786 		free(link_target);
6787 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6788 		    0, 0);
6789 		if (err) {
6790 			free(line);
6791 			break;
6792 		}
6793 		if (n == s->selected) {
6794 			if (view->focussed)
6795 				wstandout(view->window);
6796 			s->selected_entry = te;
6797 		}
6798 		tc = match_color(&s->colors, line);
6799 		if (tc)
6800 			wattr_on(view->window,
6801 			    COLOR_PAIR(tc->colorpair), NULL);
6802 		waddwstr(view->window, wline);
6803 		if (tc)
6804 			wattr_off(view->window,
6805 			    COLOR_PAIR(tc->colorpair), NULL);
6806 		if (width < view->ncols - 1)
6807 			waddch(view->window, '\n');
6808 		if (n == s->selected && view->focussed)
6809 			wstandend(view->window);
6810 		free(line);
6811 		free(wline);
6812 		wline = NULL;
6813 		n++;
6814 		s->ndisplayed++;
6815 		s->last_displayed_entry = te;
6816 		if (--limit <= 0)
6817 			break;
6818 	}
6819 
6820 	return err;
6821 }
6822 
6823 static void
6824 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6825 {
6826 	struct got_tree_entry *te;
6827 	int isroot = s->tree == s->root;
6828 	int i = 0;
6829 
6830 	if (s->first_displayed_entry == NULL)
6831 		return;
6832 
6833 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6834 	while (i++ < maxscroll) {
6835 		if (te == NULL) {
6836 			if (!isroot)
6837 				s->first_displayed_entry = NULL;
6838 			break;
6839 		}
6840 		s->first_displayed_entry = te;
6841 		te = got_tree_entry_get_prev(s->tree, te);
6842 	}
6843 }
6844 
6845 static const struct got_error *
6846 tree_scroll_down(struct tog_view *view, int maxscroll)
6847 {
6848 	struct tog_tree_view_state *s = &view->state.tree;
6849 	struct got_tree_entry *next, *last;
6850 	int n = 0;
6851 
6852 	if (s->first_displayed_entry)
6853 		next = got_tree_entry_get_next(s->tree,
6854 		    s->first_displayed_entry);
6855 	else
6856 		next = got_object_tree_get_first_entry(s->tree);
6857 
6858 	last = s->last_displayed_entry;
6859 	while (next && n++ < maxscroll) {
6860 		if (last) {
6861 			s->last_displayed_entry = last;
6862 			last = got_tree_entry_get_next(s->tree, last);
6863 		}
6864 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6865 			s->first_displayed_entry = next;
6866 			next = got_tree_entry_get_next(s->tree, next);
6867 		}
6868 	}
6869 
6870 	return NULL;
6871 }
6872 
6873 static const struct got_error *
6874 tree_entry_path(char **path, struct tog_parent_trees *parents,
6875     struct got_tree_entry *te)
6876 {
6877 	const struct got_error *err = NULL;
6878 	struct tog_parent_tree *pt;
6879 	size_t len = 2; /* for leading slash and NUL */
6880 
6881 	TAILQ_FOREACH(pt, parents, entry)
6882 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6883 		    + 1 /* slash */;
6884 	if (te)
6885 		len += strlen(got_tree_entry_get_name(te));
6886 
6887 	*path = calloc(1, len);
6888 	if (path == NULL)
6889 		return got_error_from_errno("calloc");
6890 
6891 	(*path)[0] = '/';
6892 	pt = TAILQ_LAST(parents, tog_parent_trees);
6893 	while (pt) {
6894 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6895 		if (strlcat(*path, name, len) >= len) {
6896 			err = got_error(GOT_ERR_NO_SPACE);
6897 			goto done;
6898 		}
6899 		if (strlcat(*path, "/", len) >= len) {
6900 			err = got_error(GOT_ERR_NO_SPACE);
6901 			goto done;
6902 		}
6903 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6904 	}
6905 	if (te) {
6906 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6907 			err = got_error(GOT_ERR_NO_SPACE);
6908 			goto done;
6909 		}
6910 	}
6911 done:
6912 	if (err) {
6913 		free(*path);
6914 		*path = NULL;
6915 	}
6916 	return err;
6917 }
6918 
6919 static const struct got_error *
6920 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6921     struct got_tree_entry *te, struct tog_parent_trees *parents,
6922     struct got_object_id *commit_id, struct got_repository *repo)
6923 {
6924 	const struct got_error *err = NULL;
6925 	char *path;
6926 	struct tog_view *blame_view;
6927 
6928 	*new_view = NULL;
6929 
6930 	err = tree_entry_path(&path, parents, te);
6931 	if (err)
6932 		return err;
6933 
6934 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6935 	if (blame_view == NULL) {
6936 		err = got_error_from_errno("view_open");
6937 		goto done;
6938 	}
6939 
6940 	err = open_blame_view(blame_view, path, commit_id, repo);
6941 	if (err) {
6942 		if (err->code == GOT_ERR_CANCELLED)
6943 			err = NULL;
6944 		view_close(blame_view);
6945 	} else
6946 		*new_view = blame_view;
6947 done:
6948 	free(path);
6949 	return err;
6950 }
6951 
6952 static const struct got_error *
6953 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6954     struct tog_tree_view_state *s)
6955 {
6956 	struct tog_view *log_view;
6957 	const struct got_error *err = NULL;
6958 	char *path;
6959 
6960 	*new_view = NULL;
6961 
6962 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6963 	if (log_view == NULL)
6964 		return got_error_from_errno("view_open");
6965 
6966 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6967 	if (err)
6968 		return err;
6969 
6970 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6971 	    path, 0);
6972 	if (err)
6973 		view_close(log_view);
6974 	else
6975 		*new_view = log_view;
6976 	free(path);
6977 	return err;
6978 }
6979 
6980 static const struct got_error *
6981 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6982     const char *head_ref_name, struct got_repository *repo)
6983 {
6984 	const struct got_error *err = NULL;
6985 	char *commit_id_str = NULL;
6986 	struct tog_tree_view_state *s = &view->state.tree;
6987 	struct got_commit_object *commit = NULL;
6988 
6989 	TAILQ_INIT(&s->parents);
6990 	STAILQ_INIT(&s->colors);
6991 
6992 	s->commit_id = got_object_id_dup(commit_id);
6993 	if (s->commit_id == NULL)
6994 		return got_error_from_errno("got_object_id_dup");
6995 
6996 	err = got_object_open_as_commit(&commit, repo, commit_id);
6997 	if (err)
6998 		goto done;
6999 
7000 	/*
7001 	 * The root is opened here and will be closed when the view is closed.
7002 	 * Any visited subtrees and their path-wise parents are opened and
7003 	 * closed on demand.
7004 	 */
7005 	err = got_object_open_as_tree(&s->root, repo,
7006 	    got_object_commit_get_tree_id(commit));
7007 	if (err)
7008 		goto done;
7009 	s->tree = s->root;
7010 
7011 	err = got_object_id_str(&commit_id_str, commit_id);
7012 	if (err != NULL)
7013 		goto done;
7014 
7015 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7016 		err = got_error_from_errno("asprintf");
7017 		goto done;
7018 	}
7019 
7020 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7021 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7022 	if (head_ref_name) {
7023 		s->head_ref_name = strdup(head_ref_name);
7024 		if (s->head_ref_name == NULL) {
7025 			err = got_error_from_errno("strdup");
7026 			goto done;
7027 		}
7028 	}
7029 	s->repo = repo;
7030 
7031 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7032 		err = add_color(&s->colors, "\\$$",
7033 		    TOG_COLOR_TREE_SUBMODULE,
7034 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7035 		if (err)
7036 			goto done;
7037 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7038 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7039 		if (err)
7040 			goto done;
7041 		err = add_color(&s->colors, "/$",
7042 		    TOG_COLOR_TREE_DIRECTORY,
7043 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7044 		if (err)
7045 			goto done;
7046 
7047 		err = add_color(&s->colors, "\\*$",
7048 		    TOG_COLOR_TREE_EXECUTABLE,
7049 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7050 		if (err)
7051 			goto done;
7052 
7053 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7054 		    get_color_value("TOG_COLOR_COMMIT"));
7055 		if (err)
7056 			goto done;
7057 	}
7058 
7059 	view->show = show_tree_view;
7060 	view->input = input_tree_view;
7061 	view->close = close_tree_view;
7062 	view->search_start = search_start_tree_view;
7063 	view->search_next = search_next_tree_view;
7064 done:
7065 	free(commit_id_str);
7066 	if (commit)
7067 		got_object_commit_close(commit);
7068 	if (err)
7069 		close_tree_view(view);
7070 	return err;
7071 }
7072 
7073 static const struct got_error *
7074 close_tree_view(struct tog_view *view)
7075 {
7076 	struct tog_tree_view_state *s = &view->state.tree;
7077 
7078 	free_colors(&s->colors);
7079 	free(s->tree_label);
7080 	s->tree_label = NULL;
7081 	free(s->commit_id);
7082 	s->commit_id = NULL;
7083 	free(s->head_ref_name);
7084 	s->head_ref_name = NULL;
7085 	while (!TAILQ_EMPTY(&s->parents)) {
7086 		struct tog_parent_tree *parent;
7087 		parent = TAILQ_FIRST(&s->parents);
7088 		TAILQ_REMOVE(&s->parents, parent, entry);
7089 		if (parent->tree != s->root)
7090 			got_object_tree_close(parent->tree);
7091 		free(parent);
7092 
7093 	}
7094 	if (s->tree != NULL && s->tree != s->root)
7095 		got_object_tree_close(s->tree);
7096 	if (s->root)
7097 		got_object_tree_close(s->root);
7098 	return NULL;
7099 }
7100 
7101 static const struct got_error *
7102 search_start_tree_view(struct tog_view *view)
7103 {
7104 	struct tog_tree_view_state *s = &view->state.tree;
7105 
7106 	s->matched_entry = NULL;
7107 	return NULL;
7108 }
7109 
7110 static int
7111 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7112 {
7113 	regmatch_t regmatch;
7114 
7115 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7116 	    0) == 0;
7117 }
7118 
7119 static const struct got_error *
7120 search_next_tree_view(struct tog_view *view)
7121 {
7122 	struct tog_tree_view_state *s = &view->state.tree;
7123 	struct got_tree_entry *te = NULL;
7124 
7125 	if (!view->searching) {
7126 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7127 		return NULL;
7128 	}
7129 
7130 	if (s->matched_entry) {
7131 		if (view->searching == TOG_SEARCH_FORWARD) {
7132 			if (s->selected_entry)
7133 				te = got_tree_entry_get_next(s->tree,
7134 				    s->selected_entry);
7135 			else
7136 				te = got_object_tree_get_first_entry(s->tree);
7137 		} else {
7138 			if (s->selected_entry == NULL)
7139 				te = got_object_tree_get_last_entry(s->tree);
7140 			else
7141 				te = got_tree_entry_get_prev(s->tree,
7142 				    s->selected_entry);
7143 		}
7144 	} else {
7145 		if (s->selected_entry)
7146 			te = s->selected_entry;
7147 		else if (view->searching == TOG_SEARCH_FORWARD)
7148 			te = got_object_tree_get_first_entry(s->tree);
7149 		else
7150 			te = got_object_tree_get_last_entry(s->tree);
7151 	}
7152 
7153 	while (1) {
7154 		if (te == NULL) {
7155 			if (s->matched_entry == NULL) {
7156 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7157 				return NULL;
7158 			}
7159 			if (view->searching == TOG_SEARCH_FORWARD)
7160 				te = got_object_tree_get_first_entry(s->tree);
7161 			else
7162 				te = got_object_tree_get_last_entry(s->tree);
7163 		}
7164 
7165 		if (match_tree_entry(te, &view->regex)) {
7166 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7167 			s->matched_entry = te;
7168 			break;
7169 		}
7170 
7171 		if (view->searching == TOG_SEARCH_FORWARD)
7172 			te = got_tree_entry_get_next(s->tree, te);
7173 		else
7174 			te = got_tree_entry_get_prev(s->tree, te);
7175 	}
7176 
7177 	if (s->matched_entry) {
7178 		s->first_displayed_entry = s->matched_entry;
7179 		s->selected = 0;
7180 	}
7181 
7182 	return NULL;
7183 }
7184 
7185 static const struct got_error *
7186 show_tree_view(struct tog_view *view)
7187 {
7188 	const struct got_error *err = NULL;
7189 	struct tog_tree_view_state *s = &view->state.tree;
7190 	char *parent_path;
7191 
7192 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7193 	if (err)
7194 		return err;
7195 
7196 	err = draw_tree_entries(view, parent_path);
7197 	free(parent_path);
7198 
7199 	view_border(view);
7200 	return err;
7201 }
7202 
7203 static const struct got_error *
7204 tree_goto_line(struct tog_view *view, int nlines)
7205 {
7206 	const struct got_error		 *err = NULL;
7207 	struct tog_tree_view_state	 *s = &view->state.tree;
7208 	struct got_tree_entry		**fte, **lte, **ste;
7209 	int				  g, last, first = 1, i = 1;
7210 	int				  root = s->tree == s->root;
7211 	int				  off = root ? 1 : 2;
7212 
7213 	g = view->gline;
7214 	view->gline = 0;
7215 
7216 	if (g == 0)
7217 		g = 1;
7218 	else if (g > got_object_tree_get_nentries(s->tree))
7219 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7220 
7221 	fte = &s->first_displayed_entry;
7222 	lte = &s->last_displayed_entry;
7223 	ste = &s->selected_entry;
7224 
7225 	if (*fte != NULL) {
7226 		first = got_tree_entry_get_index(*fte);
7227 		first += off;  /* account for ".." */
7228 	}
7229 	last = got_tree_entry_get_index(*lte);
7230 	last += off;
7231 
7232 	if (g >= first && g <= last && g - first < nlines) {
7233 		s->selected = g - first;
7234 		return NULL;	/* gline is on the current page */
7235 	}
7236 
7237 	if (*ste != NULL) {
7238 		i = got_tree_entry_get_index(*ste);
7239 		i += off;
7240 	}
7241 
7242 	if (i < g) {
7243 		err = tree_scroll_down(view, g - i);
7244 		if (err)
7245 			return err;
7246 		if (got_tree_entry_get_index(*lte) >=
7247 		    got_object_tree_get_nentries(s->tree) - 1 &&
7248 		    first + s->selected < g &&
7249 		    s->selected < s->ndisplayed - 1) {
7250 			first = got_tree_entry_get_index(*fte);
7251 			first += off;
7252 			s->selected = g - first;
7253 		}
7254 	} else if (i > g)
7255 		tree_scroll_up(s, i - g);
7256 
7257 	if (g < nlines &&
7258 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7259 		s->selected = g - 1;
7260 
7261 	return NULL;
7262 }
7263 
7264 static const struct got_error *
7265 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7266 {
7267 	const struct got_error *err = NULL;
7268 	struct tog_tree_view_state *s = &view->state.tree;
7269 	struct got_tree_entry *te;
7270 	int n, nscroll = view->nlines - 3;
7271 
7272 	if (view->gline)
7273 		return tree_goto_line(view, nscroll);
7274 
7275 	switch (ch) {
7276 	case 'i':
7277 		s->show_ids = !s->show_ids;
7278 		view->count = 0;
7279 		break;
7280 	case 'L':
7281 		view->count = 0;
7282 		if (!s->selected_entry)
7283 			break;
7284 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7285 		break;
7286 	case 'R':
7287 		view->count = 0;
7288 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7289 		break;
7290 	case 'g':
7291 	case KEY_HOME:
7292 		s->selected = 0;
7293 		view->count = 0;
7294 		if (s->tree == s->root)
7295 			s->first_displayed_entry =
7296 			    got_object_tree_get_first_entry(s->tree);
7297 		else
7298 			s->first_displayed_entry = NULL;
7299 		break;
7300 	case 'G':
7301 	case KEY_END: {
7302 		int eos = view->nlines - 3;
7303 
7304 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7305 			--eos;  /* border */
7306 		s->selected = 0;
7307 		view->count = 0;
7308 		te = got_object_tree_get_last_entry(s->tree);
7309 		for (n = 0; n < eos; n++) {
7310 			if (te == NULL) {
7311 				if (s->tree != s->root) {
7312 					s->first_displayed_entry = NULL;
7313 					n++;
7314 				}
7315 				break;
7316 			}
7317 			s->first_displayed_entry = te;
7318 			te = got_tree_entry_get_prev(s->tree, te);
7319 		}
7320 		if (n > 0)
7321 			s->selected = n - 1;
7322 		break;
7323 	}
7324 	case 'k':
7325 	case KEY_UP:
7326 	case CTRL('p'):
7327 		if (s->selected > 0) {
7328 			s->selected--;
7329 			break;
7330 		}
7331 		tree_scroll_up(s, 1);
7332 		if (s->selected_entry == NULL ||
7333 		    (s->tree == s->root && s->selected_entry ==
7334 		     got_object_tree_get_first_entry(s->tree)))
7335 			view->count = 0;
7336 		break;
7337 	case CTRL('u'):
7338 	case 'u':
7339 		nscroll /= 2;
7340 		/* FALL THROUGH */
7341 	case KEY_PPAGE:
7342 	case CTRL('b'):
7343 	case 'b':
7344 		if (s->tree == s->root) {
7345 			if (got_object_tree_get_first_entry(s->tree) ==
7346 			    s->first_displayed_entry)
7347 				s->selected -= MIN(s->selected, nscroll);
7348 		} else {
7349 			if (s->first_displayed_entry == NULL)
7350 				s->selected -= MIN(s->selected, nscroll);
7351 		}
7352 		tree_scroll_up(s, MAX(0, nscroll));
7353 		if (s->selected_entry == NULL ||
7354 		    (s->tree == s->root && s->selected_entry ==
7355 		     got_object_tree_get_first_entry(s->tree)))
7356 			view->count = 0;
7357 		break;
7358 	case 'j':
7359 	case KEY_DOWN:
7360 	case CTRL('n'):
7361 		if (s->selected < s->ndisplayed - 1) {
7362 			s->selected++;
7363 			break;
7364 		}
7365 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7366 		    == NULL) {
7367 			/* can't scroll any further */
7368 			view->count = 0;
7369 			break;
7370 		}
7371 		tree_scroll_down(view, 1);
7372 		break;
7373 	case CTRL('d'):
7374 	case 'd':
7375 		nscroll /= 2;
7376 		/* FALL THROUGH */
7377 	case KEY_NPAGE:
7378 	case CTRL('f'):
7379 	case 'f':
7380 	case ' ':
7381 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7382 		    == NULL) {
7383 			/* can't scroll any further; move cursor down */
7384 			if (s->selected < s->ndisplayed - 1)
7385 				s->selected += MIN(nscroll,
7386 				    s->ndisplayed - s->selected - 1);
7387 			else
7388 				view->count = 0;
7389 			break;
7390 		}
7391 		tree_scroll_down(view, nscroll);
7392 		break;
7393 	case KEY_ENTER:
7394 	case '\r':
7395 	case KEY_BACKSPACE:
7396 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7397 			struct tog_parent_tree *parent;
7398 			/* user selected '..' */
7399 			if (s->tree == s->root) {
7400 				view->count = 0;
7401 				break;
7402 			}
7403 			parent = TAILQ_FIRST(&s->parents);
7404 			TAILQ_REMOVE(&s->parents, parent,
7405 			    entry);
7406 			got_object_tree_close(s->tree);
7407 			s->tree = parent->tree;
7408 			s->first_displayed_entry =
7409 			    parent->first_displayed_entry;
7410 			s->selected_entry =
7411 			    parent->selected_entry;
7412 			s->selected = parent->selected;
7413 			if (s->selected > view->nlines - 3) {
7414 				err = offset_selection_down(view);
7415 				if (err)
7416 					break;
7417 			}
7418 			free(parent);
7419 		} else if (S_ISDIR(got_tree_entry_get_mode(
7420 		    s->selected_entry))) {
7421 			struct got_tree_object *subtree;
7422 			view->count = 0;
7423 			err = got_object_open_as_tree(&subtree, s->repo,
7424 			    got_tree_entry_get_id(s->selected_entry));
7425 			if (err)
7426 				break;
7427 			err = tree_view_visit_subtree(s, subtree);
7428 			if (err) {
7429 				got_object_tree_close(subtree);
7430 				break;
7431 			}
7432 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7433 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7434 		break;
7435 	case KEY_RESIZE:
7436 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7437 			s->selected = view->nlines - 4;
7438 		view->count = 0;
7439 		break;
7440 	default:
7441 		view->count = 0;
7442 		break;
7443 	}
7444 
7445 	return err;
7446 }
7447 
7448 __dead static void
7449 usage_tree(void)
7450 {
7451 	endwin();
7452 	fprintf(stderr,
7453 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7454 	    getprogname());
7455 	exit(1);
7456 }
7457 
7458 static const struct got_error *
7459 cmd_tree(int argc, char *argv[])
7460 {
7461 	const struct got_error *error;
7462 	struct got_repository *repo = NULL;
7463 	struct got_worktree *worktree = NULL;
7464 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7465 	struct got_object_id *commit_id = NULL;
7466 	struct got_commit_object *commit = NULL;
7467 	const char *commit_id_arg = NULL;
7468 	char *label = NULL;
7469 	struct got_reference *ref = NULL;
7470 	const char *head_ref_name = NULL;
7471 	int ch;
7472 	struct tog_view *view;
7473 	int *pack_fds = NULL;
7474 
7475 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7476 		switch (ch) {
7477 		case 'c':
7478 			commit_id_arg = optarg;
7479 			break;
7480 		case 'r':
7481 			repo_path = realpath(optarg, NULL);
7482 			if (repo_path == NULL)
7483 				return got_error_from_errno2("realpath",
7484 				    optarg);
7485 			break;
7486 		default:
7487 			usage_tree();
7488 			/* NOTREACHED */
7489 		}
7490 	}
7491 
7492 	argc -= optind;
7493 	argv += optind;
7494 
7495 	if (argc > 1)
7496 		usage_tree();
7497 
7498 	error = got_repo_pack_fds_open(&pack_fds);
7499 	if (error != NULL)
7500 		goto done;
7501 
7502 	if (repo_path == NULL) {
7503 		cwd = getcwd(NULL, 0);
7504 		if (cwd == NULL)
7505 			return got_error_from_errno("getcwd");
7506 		error = got_worktree_open(&worktree, cwd);
7507 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7508 			goto done;
7509 		if (worktree)
7510 			repo_path =
7511 			    strdup(got_worktree_get_repo_path(worktree));
7512 		else
7513 			repo_path = strdup(cwd);
7514 		if (repo_path == NULL) {
7515 			error = got_error_from_errno("strdup");
7516 			goto done;
7517 		}
7518 	}
7519 
7520 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7521 	if (error != NULL)
7522 		goto done;
7523 
7524 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7525 	    repo, worktree);
7526 	if (error)
7527 		goto done;
7528 
7529 	init_curses();
7530 
7531 	error = apply_unveil(got_repo_get_path(repo), NULL);
7532 	if (error)
7533 		goto done;
7534 
7535 	error = tog_load_refs(repo, 0);
7536 	if (error)
7537 		goto done;
7538 
7539 	if (commit_id_arg == NULL) {
7540 		error = got_repo_match_object_id(&commit_id, &label,
7541 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7542 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7543 		if (error)
7544 			goto done;
7545 		head_ref_name = label;
7546 	} else {
7547 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7548 		if (error == NULL)
7549 			head_ref_name = got_ref_get_name(ref);
7550 		else if (error->code != GOT_ERR_NOT_REF)
7551 			goto done;
7552 		error = got_repo_match_object_id(&commit_id, NULL,
7553 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7554 		if (error)
7555 			goto done;
7556 	}
7557 
7558 	error = got_object_open_as_commit(&commit, repo, commit_id);
7559 	if (error)
7560 		goto done;
7561 
7562 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7563 	if (view == NULL) {
7564 		error = got_error_from_errno("view_open");
7565 		goto done;
7566 	}
7567 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7568 	if (error)
7569 		goto done;
7570 	if (!got_path_is_root_dir(in_repo_path)) {
7571 		error = tree_view_walk_path(&view->state.tree, commit,
7572 		    in_repo_path);
7573 		if (error)
7574 			goto done;
7575 	}
7576 
7577 	if (worktree) {
7578 		/* Release work tree lock. */
7579 		got_worktree_close(worktree);
7580 		worktree = NULL;
7581 	}
7582 	error = view_loop(view);
7583 done:
7584 	free(repo_path);
7585 	free(cwd);
7586 	free(commit_id);
7587 	free(label);
7588 	if (ref)
7589 		got_ref_close(ref);
7590 	if (repo) {
7591 		const struct got_error *close_err = got_repo_close(repo);
7592 		if (error == NULL)
7593 			error = close_err;
7594 	}
7595 	if (pack_fds) {
7596 		const struct got_error *pack_err =
7597 		    got_repo_pack_fds_close(pack_fds);
7598 		if (error == NULL)
7599 			error = pack_err;
7600 	}
7601 	tog_free_refs();
7602 	return error;
7603 }
7604 
7605 static const struct got_error *
7606 ref_view_load_refs(struct tog_ref_view_state *s)
7607 {
7608 	struct got_reflist_entry *sre;
7609 	struct tog_reflist_entry *re;
7610 
7611 	s->nrefs = 0;
7612 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7613 		if (strncmp(got_ref_get_name(sre->ref),
7614 		    "refs/got/", 9) == 0 &&
7615 		    strncmp(got_ref_get_name(sre->ref),
7616 		    "refs/got/backup/", 16) != 0)
7617 			continue;
7618 
7619 		re = malloc(sizeof(*re));
7620 		if (re == NULL)
7621 			return got_error_from_errno("malloc");
7622 
7623 		re->ref = got_ref_dup(sre->ref);
7624 		if (re->ref == NULL)
7625 			return got_error_from_errno("got_ref_dup");
7626 		re->idx = s->nrefs++;
7627 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7628 	}
7629 
7630 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7631 	return NULL;
7632 }
7633 
7634 static void
7635 ref_view_free_refs(struct tog_ref_view_state *s)
7636 {
7637 	struct tog_reflist_entry *re;
7638 
7639 	while (!TAILQ_EMPTY(&s->refs)) {
7640 		re = TAILQ_FIRST(&s->refs);
7641 		TAILQ_REMOVE(&s->refs, re, entry);
7642 		got_ref_close(re->ref);
7643 		free(re);
7644 	}
7645 }
7646 
7647 static const struct got_error *
7648 open_ref_view(struct tog_view *view, struct got_repository *repo)
7649 {
7650 	const struct got_error *err = NULL;
7651 	struct tog_ref_view_state *s = &view->state.ref;
7652 
7653 	s->selected_entry = 0;
7654 	s->repo = repo;
7655 
7656 	TAILQ_INIT(&s->refs);
7657 	STAILQ_INIT(&s->colors);
7658 
7659 	err = ref_view_load_refs(s);
7660 	if (err)
7661 		return err;
7662 
7663 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7664 		err = add_color(&s->colors, "^refs/heads/",
7665 		    TOG_COLOR_REFS_HEADS,
7666 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7667 		if (err)
7668 			goto done;
7669 
7670 		err = add_color(&s->colors, "^refs/tags/",
7671 		    TOG_COLOR_REFS_TAGS,
7672 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7673 		if (err)
7674 			goto done;
7675 
7676 		err = add_color(&s->colors, "^refs/remotes/",
7677 		    TOG_COLOR_REFS_REMOTES,
7678 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7679 		if (err)
7680 			goto done;
7681 
7682 		err = add_color(&s->colors, "^refs/got/backup/",
7683 		    TOG_COLOR_REFS_BACKUP,
7684 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7685 		if (err)
7686 			goto done;
7687 	}
7688 
7689 	view->show = show_ref_view;
7690 	view->input = input_ref_view;
7691 	view->close = close_ref_view;
7692 	view->search_start = search_start_ref_view;
7693 	view->search_next = search_next_ref_view;
7694 done:
7695 	if (err)
7696 		free_colors(&s->colors);
7697 	return err;
7698 }
7699 
7700 static const struct got_error *
7701 close_ref_view(struct tog_view *view)
7702 {
7703 	struct tog_ref_view_state *s = &view->state.ref;
7704 
7705 	ref_view_free_refs(s);
7706 	free_colors(&s->colors);
7707 
7708 	return NULL;
7709 }
7710 
7711 static const struct got_error *
7712 resolve_reflist_entry(struct got_object_id **commit_id,
7713     struct tog_reflist_entry *re, struct got_repository *repo)
7714 {
7715 	const struct got_error *err = NULL;
7716 	struct got_object_id *obj_id;
7717 	struct got_tag_object *tag = NULL;
7718 	int obj_type;
7719 
7720 	*commit_id = NULL;
7721 
7722 	err = got_ref_resolve(&obj_id, repo, re->ref);
7723 	if (err)
7724 		return err;
7725 
7726 	err = got_object_get_type(&obj_type, repo, obj_id);
7727 	if (err)
7728 		goto done;
7729 
7730 	switch (obj_type) {
7731 	case GOT_OBJ_TYPE_COMMIT:
7732 		*commit_id = obj_id;
7733 		break;
7734 	case GOT_OBJ_TYPE_TAG:
7735 		err = got_object_open_as_tag(&tag, repo, obj_id);
7736 		if (err)
7737 			goto done;
7738 		free(obj_id);
7739 		err = got_object_get_type(&obj_type, repo,
7740 		    got_object_tag_get_object_id(tag));
7741 		if (err)
7742 			goto done;
7743 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7744 			err = got_error(GOT_ERR_OBJ_TYPE);
7745 			goto done;
7746 		}
7747 		*commit_id = got_object_id_dup(
7748 		    got_object_tag_get_object_id(tag));
7749 		if (*commit_id == NULL) {
7750 			err = got_error_from_errno("got_object_id_dup");
7751 			goto done;
7752 		}
7753 		break;
7754 	default:
7755 		err = got_error(GOT_ERR_OBJ_TYPE);
7756 		break;
7757 	}
7758 
7759 done:
7760 	if (tag)
7761 		got_object_tag_close(tag);
7762 	if (err) {
7763 		free(*commit_id);
7764 		*commit_id = NULL;
7765 	}
7766 	return err;
7767 }
7768 
7769 static const struct got_error *
7770 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7771     struct tog_reflist_entry *re, struct got_repository *repo)
7772 {
7773 	struct tog_view *log_view;
7774 	const struct got_error *err = NULL;
7775 	struct got_object_id *commit_id = NULL;
7776 
7777 	*new_view = NULL;
7778 
7779 	err = resolve_reflist_entry(&commit_id, re, repo);
7780 	if (err) {
7781 		if (err->code != GOT_ERR_OBJ_TYPE)
7782 			return err;
7783 		else
7784 			return NULL;
7785 	}
7786 
7787 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7788 	if (log_view == NULL) {
7789 		err = got_error_from_errno("view_open");
7790 		goto done;
7791 	}
7792 
7793 	err = open_log_view(log_view, commit_id, repo,
7794 	    got_ref_get_name(re->ref), "", 0);
7795 done:
7796 	if (err)
7797 		view_close(log_view);
7798 	else
7799 		*new_view = log_view;
7800 	free(commit_id);
7801 	return err;
7802 }
7803 
7804 static void
7805 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7806 {
7807 	struct tog_reflist_entry *re;
7808 	int i = 0;
7809 
7810 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7811 		return;
7812 
7813 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7814 	while (i++ < maxscroll) {
7815 		if (re == NULL)
7816 			break;
7817 		s->first_displayed_entry = re;
7818 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7819 	}
7820 }
7821 
7822 static const struct got_error *
7823 ref_scroll_down(struct tog_view *view, int maxscroll)
7824 {
7825 	struct tog_ref_view_state *s = &view->state.ref;
7826 	struct tog_reflist_entry *next, *last;
7827 	int n = 0;
7828 
7829 	if (s->first_displayed_entry)
7830 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7831 	else
7832 		next = TAILQ_FIRST(&s->refs);
7833 
7834 	last = s->last_displayed_entry;
7835 	while (next && n++ < maxscroll) {
7836 		if (last) {
7837 			s->last_displayed_entry = last;
7838 			last = TAILQ_NEXT(last, entry);
7839 		}
7840 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7841 			s->first_displayed_entry = next;
7842 			next = TAILQ_NEXT(next, entry);
7843 		}
7844 	}
7845 
7846 	return NULL;
7847 }
7848 
7849 static const struct got_error *
7850 search_start_ref_view(struct tog_view *view)
7851 {
7852 	struct tog_ref_view_state *s = &view->state.ref;
7853 
7854 	s->matched_entry = NULL;
7855 	return NULL;
7856 }
7857 
7858 static int
7859 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7860 {
7861 	regmatch_t regmatch;
7862 
7863 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7864 	    0) == 0;
7865 }
7866 
7867 static const struct got_error *
7868 search_next_ref_view(struct tog_view *view)
7869 {
7870 	struct tog_ref_view_state *s = &view->state.ref;
7871 	struct tog_reflist_entry *re = NULL;
7872 
7873 	if (!view->searching) {
7874 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7875 		return NULL;
7876 	}
7877 
7878 	if (s->matched_entry) {
7879 		if (view->searching == TOG_SEARCH_FORWARD) {
7880 			if (s->selected_entry)
7881 				re = TAILQ_NEXT(s->selected_entry, entry);
7882 			else
7883 				re = TAILQ_PREV(s->selected_entry,
7884 				    tog_reflist_head, entry);
7885 		} else {
7886 			if (s->selected_entry == NULL)
7887 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7888 			else
7889 				re = TAILQ_PREV(s->selected_entry,
7890 				    tog_reflist_head, entry);
7891 		}
7892 	} else {
7893 		if (s->selected_entry)
7894 			re = s->selected_entry;
7895 		else if (view->searching == TOG_SEARCH_FORWARD)
7896 			re = TAILQ_FIRST(&s->refs);
7897 		else
7898 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7899 	}
7900 
7901 	while (1) {
7902 		if (re == NULL) {
7903 			if (s->matched_entry == NULL) {
7904 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7905 				return NULL;
7906 			}
7907 			if (view->searching == TOG_SEARCH_FORWARD)
7908 				re = TAILQ_FIRST(&s->refs);
7909 			else
7910 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7911 		}
7912 
7913 		if (match_reflist_entry(re, &view->regex)) {
7914 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7915 			s->matched_entry = re;
7916 			break;
7917 		}
7918 
7919 		if (view->searching == TOG_SEARCH_FORWARD)
7920 			re = TAILQ_NEXT(re, entry);
7921 		else
7922 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7923 	}
7924 
7925 	if (s->matched_entry) {
7926 		s->first_displayed_entry = s->matched_entry;
7927 		s->selected = 0;
7928 	}
7929 
7930 	return NULL;
7931 }
7932 
7933 static const struct got_error *
7934 show_ref_view(struct tog_view *view)
7935 {
7936 	const struct got_error *err = NULL;
7937 	struct tog_ref_view_state *s = &view->state.ref;
7938 	struct tog_reflist_entry *re;
7939 	char *line = NULL;
7940 	wchar_t *wline;
7941 	struct tog_color *tc;
7942 	int width, n;
7943 	int limit = view->nlines;
7944 
7945 	werase(view->window);
7946 
7947 	s->ndisplayed = 0;
7948 	if (view_is_hsplit_top(view))
7949 		--limit;  /* border */
7950 
7951 	if (limit == 0)
7952 		return NULL;
7953 
7954 	re = s->first_displayed_entry;
7955 
7956 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7957 	    s->nrefs) == -1)
7958 		return got_error_from_errno("asprintf");
7959 
7960 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7961 	if (err) {
7962 		free(line);
7963 		return err;
7964 	}
7965 	if (view_needs_focus_indication(view))
7966 		wstandout(view->window);
7967 	waddwstr(view->window, wline);
7968 	while (width++ < view->ncols)
7969 		waddch(view->window, ' ');
7970 	if (view_needs_focus_indication(view))
7971 		wstandend(view->window);
7972 	free(wline);
7973 	wline = NULL;
7974 	free(line);
7975 	line = NULL;
7976 	if (--limit <= 0)
7977 		return NULL;
7978 
7979 	n = 0;
7980 	while (re && limit > 0) {
7981 		char *line = NULL;
7982 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7983 
7984 		if (s->show_date) {
7985 			struct got_commit_object *ci;
7986 			struct got_tag_object *tag;
7987 			struct got_object_id *id;
7988 			struct tm tm;
7989 			time_t t;
7990 
7991 			err = got_ref_resolve(&id, s->repo, re->ref);
7992 			if (err)
7993 				return err;
7994 			err = got_object_open_as_tag(&tag, s->repo, id);
7995 			if (err) {
7996 				if (err->code != GOT_ERR_OBJ_TYPE) {
7997 					free(id);
7998 					return err;
7999 				}
8000 				err = got_object_open_as_commit(&ci, s->repo,
8001 				    id);
8002 				if (err) {
8003 					free(id);
8004 					return err;
8005 				}
8006 				t = got_object_commit_get_committer_time(ci);
8007 				got_object_commit_close(ci);
8008 			} else {
8009 				t = got_object_tag_get_tagger_time(tag);
8010 				got_object_tag_close(tag);
8011 			}
8012 			free(id);
8013 			if (gmtime_r(&t, &tm) == NULL)
8014 				return got_error_from_errno("gmtime_r");
8015 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8016 				return got_error(GOT_ERR_NO_SPACE);
8017 		}
8018 		if (got_ref_is_symbolic(re->ref)) {
8019 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8020 			    ymd : "", got_ref_get_name(re->ref),
8021 			    got_ref_get_symref_target(re->ref)) == -1)
8022 				return got_error_from_errno("asprintf");
8023 		} else if (s->show_ids) {
8024 			struct got_object_id *id;
8025 			char *id_str;
8026 			err = got_ref_resolve(&id, s->repo, re->ref);
8027 			if (err)
8028 				return err;
8029 			err = got_object_id_str(&id_str, id);
8030 			if (err) {
8031 				free(id);
8032 				return err;
8033 			}
8034 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8035 			    got_ref_get_name(re->ref), id_str) == -1) {
8036 				err = got_error_from_errno("asprintf");
8037 				free(id);
8038 				free(id_str);
8039 				return err;
8040 			}
8041 			free(id);
8042 			free(id_str);
8043 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8044 		    got_ref_get_name(re->ref)) == -1)
8045 			return got_error_from_errno("asprintf");
8046 
8047 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8048 		    0, 0);
8049 		if (err) {
8050 			free(line);
8051 			return err;
8052 		}
8053 		if (n == s->selected) {
8054 			if (view->focussed)
8055 				wstandout(view->window);
8056 			s->selected_entry = re;
8057 		}
8058 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8059 		if (tc)
8060 			wattr_on(view->window,
8061 			    COLOR_PAIR(tc->colorpair), NULL);
8062 		waddwstr(view->window, wline);
8063 		if (tc)
8064 			wattr_off(view->window,
8065 			    COLOR_PAIR(tc->colorpair), NULL);
8066 		if (width < view->ncols - 1)
8067 			waddch(view->window, '\n');
8068 		if (n == s->selected && view->focussed)
8069 			wstandend(view->window);
8070 		free(line);
8071 		free(wline);
8072 		wline = NULL;
8073 		n++;
8074 		s->ndisplayed++;
8075 		s->last_displayed_entry = re;
8076 
8077 		limit--;
8078 		re = TAILQ_NEXT(re, entry);
8079 	}
8080 
8081 	view_border(view);
8082 	return err;
8083 }
8084 
8085 static const struct got_error *
8086 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8087     struct tog_reflist_entry *re, struct got_repository *repo)
8088 {
8089 	const struct got_error *err = NULL;
8090 	struct got_object_id *commit_id = NULL;
8091 	struct tog_view *tree_view;
8092 
8093 	*new_view = NULL;
8094 
8095 	err = resolve_reflist_entry(&commit_id, re, repo);
8096 	if (err) {
8097 		if (err->code != GOT_ERR_OBJ_TYPE)
8098 			return err;
8099 		else
8100 			return NULL;
8101 	}
8102 
8103 
8104 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8105 	if (tree_view == NULL) {
8106 		err = got_error_from_errno("view_open");
8107 		goto done;
8108 	}
8109 
8110 	err = open_tree_view(tree_view, commit_id,
8111 	    got_ref_get_name(re->ref), repo);
8112 	if (err)
8113 		goto done;
8114 
8115 	*new_view = tree_view;
8116 done:
8117 	free(commit_id);
8118 	return err;
8119 }
8120 
8121 static const struct got_error *
8122 ref_goto_line(struct tog_view *view, int nlines)
8123 {
8124 	const struct got_error		*err = NULL;
8125 	struct tog_ref_view_state	*s = &view->state.ref;
8126 	int				 g, idx = s->selected_entry->idx;
8127 
8128 	g = view->gline;
8129 	view->gline = 0;
8130 
8131 	if (g == 0)
8132 		g = 1;
8133 	else if (g > s->nrefs)
8134 		g = s->nrefs;
8135 
8136 	if (g >= s->first_displayed_entry->idx + 1 &&
8137 	    g <= s->last_displayed_entry->idx + 1 &&
8138 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8139 		s->selected = g - s->first_displayed_entry->idx - 1;
8140 		return NULL;
8141 	}
8142 
8143 	if (idx + 1 < g) {
8144 		err = ref_scroll_down(view, g - idx - 1);
8145 		if (err)
8146 			return err;
8147 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8148 		    s->first_displayed_entry->idx + s->selected < g &&
8149 		    s->selected < s->ndisplayed - 1)
8150 			s->selected = g - s->first_displayed_entry->idx - 1;
8151 	} else if (idx + 1 > g)
8152 		ref_scroll_up(s, idx - g + 1);
8153 
8154 	if (g < nlines && s->first_displayed_entry->idx == 0)
8155 		s->selected = g - 1;
8156 
8157 	return NULL;
8158 
8159 }
8160 
8161 static const struct got_error *
8162 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8163 {
8164 	const struct got_error *err = NULL;
8165 	struct tog_ref_view_state *s = &view->state.ref;
8166 	struct tog_reflist_entry *re;
8167 	int n, nscroll = view->nlines - 1;
8168 
8169 	if (view->gline)
8170 		return ref_goto_line(view, nscroll);
8171 
8172 	switch (ch) {
8173 	case 'i':
8174 		s->show_ids = !s->show_ids;
8175 		view->count = 0;
8176 		break;
8177 	case 'm':
8178 		s->show_date = !s->show_date;
8179 		view->count = 0;
8180 		break;
8181 	case 'o':
8182 		s->sort_by_date = !s->sort_by_date;
8183 		view->count = 0;
8184 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8185 		    got_ref_cmp_by_commit_timestamp_descending :
8186 		    tog_ref_cmp_by_name, s->repo);
8187 		if (err)
8188 			break;
8189 		got_reflist_object_id_map_free(tog_refs_idmap);
8190 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8191 		    &tog_refs, s->repo);
8192 		if (err)
8193 			break;
8194 		ref_view_free_refs(s);
8195 		err = ref_view_load_refs(s);
8196 		break;
8197 	case KEY_ENTER:
8198 	case '\r':
8199 		view->count = 0;
8200 		if (!s->selected_entry)
8201 			break;
8202 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8203 		break;
8204 	case 'T':
8205 		view->count = 0;
8206 		if (!s->selected_entry)
8207 			break;
8208 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8209 		break;
8210 	case 'g':
8211 	case KEY_HOME:
8212 		s->selected = 0;
8213 		view->count = 0;
8214 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8215 		break;
8216 	case 'G':
8217 	case KEY_END: {
8218 		int eos = view->nlines - 1;
8219 
8220 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8221 			--eos;  /* border */
8222 		s->selected = 0;
8223 		view->count = 0;
8224 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8225 		for (n = 0; n < eos; n++) {
8226 			if (re == NULL)
8227 				break;
8228 			s->first_displayed_entry = re;
8229 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8230 		}
8231 		if (n > 0)
8232 			s->selected = n - 1;
8233 		break;
8234 	}
8235 	case 'k':
8236 	case KEY_UP:
8237 	case CTRL('p'):
8238 		if (s->selected > 0) {
8239 			s->selected--;
8240 			break;
8241 		}
8242 		ref_scroll_up(s, 1);
8243 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8244 			view->count = 0;
8245 		break;
8246 	case CTRL('u'):
8247 	case 'u':
8248 		nscroll /= 2;
8249 		/* FALL THROUGH */
8250 	case KEY_PPAGE:
8251 	case CTRL('b'):
8252 	case 'b':
8253 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8254 			s->selected -= MIN(nscroll, s->selected);
8255 		ref_scroll_up(s, MAX(0, nscroll));
8256 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8257 			view->count = 0;
8258 		break;
8259 	case 'j':
8260 	case KEY_DOWN:
8261 	case CTRL('n'):
8262 		if (s->selected < s->ndisplayed - 1) {
8263 			s->selected++;
8264 			break;
8265 		}
8266 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8267 			/* can't scroll any further */
8268 			view->count = 0;
8269 			break;
8270 		}
8271 		ref_scroll_down(view, 1);
8272 		break;
8273 	case CTRL('d'):
8274 	case 'd':
8275 		nscroll /= 2;
8276 		/* FALL THROUGH */
8277 	case KEY_NPAGE:
8278 	case CTRL('f'):
8279 	case 'f':
8280 	case ' ':
8281 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8282 			/* can't scroll any further; move cursor down */
8283 			if (s->selected < s->ndisplayed - 1)
8284 				s->selected += MIN(nscroll,
8285 				    s->ndisplayed - s->selected - 1);
8286 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8287 				s->selected += s->ndisplayed - s->selected - 1;
8288 			view->count = 0;
8289 			break;
8290 		}
8291 		ref_scroll_down(view, nscroll);
8292 		break;
8293 	case CTRL('l'):
8294 		view->count = 0;
8295 		tog_free_refs();
8296 		err = tog_load_refs(s->repo, s->sort_by_date);
8297 		if (err)
8298 			break;
8299 		ref_view_free_refs(s);
8300 		err = ref_view_load_refs(s);
8301 		break;
8302 	case KEY_RESIZE:
8303 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8304 			s->selected = view->nlines - 2;
8305 		break;
8306 	default:
8307 		view->count = 0;
8308 		break;
8309 	}
8310 
8311 	return err;
8312 }
8313 
8314 __dead static void
8315 usage_ref(void)
8316 {
8317 	endwin();
8318 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8319 	    getprogname());
8320 	exit(1);
8321 }
8322 
8323 static const struct got_error *
8324 cmd_ref(int argc, char *argv[])
8325 {
8326 	const struct got_error *error;
8327 	struct got_repository *repo = NULL;
8328 	struct got_worktree *worktree = NULL;
8329 	char *cwd = NULL, *repo_path = NULL;
8330 	int ch;
8331 	struct tog_view *view;
8332 	int *pack_fds = NULL;
8333 
8334 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8335 		switch (ch) {
8336 		case 'r':
8337 			repo_path = realpath(optarg, NULL);
8338 			if (repo_path == NULL)
8339 				return got_error_from_errno2("realpath",
8340 				    optarg);
8341 			break;
8342 		default:
8343 			usage_ref();
8344 			/* NOTREACHED */
8345 		}
8346 	}
8347 
8348 	argc -= optind;
8349 	argv += optind;
8350 
8351 	if (argc > 1)
8352 		usage_ref();
8353 
8354 	error = got_repo_pack_fds_open(&pack_fds);
8355 	if (error != NULL)
8356 		goto done;
8357 
8358 	if (repo_path == NULL) {
8359 		cwd = getcwd(NULL, 0);
8360 		if (cwd == NULL)
8361 			return got_error_from_errno("getcwd");
8362 		error = got_worktree_open(&worktree, cwd);
8363 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8364 			goto done;
8365 		if (worktree)
8366 			repo_path =
8367 			    strdup(got_worktree_get_repo_path(worktree));
8368 		else
8369 			repo_path = strdup(cwd);
8370 		if (repo_path == NULL) {
8371 			error = got_error_from_errno("strdup");
8372 			goto done;
8373 		}
8374 	}
8375 
8376 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8377 	if (error != NULL)
8378 		goto done;
8379 
8380 	init_curses();
8381 
8382 	error = apply_unveil(got_repo_get_path(repo), NULL);
8383 	if (error)
8384 		goto done;
8385 
8386 	error = tog_load_refs(repo, 0);
8387 	if (error)
8388 		goto done;
8389 
8390 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8391 	if (view == NULL) {
8392 		error = got_error_from_errno("view_open");
8393 		goto done;
8394 	}
8395 
8396 	error = open_ref_view(view, repo);
8397 	if (error)
8398 		goto done;
8399 
8400 	if (worktree) {
8401 		/* Release work tree lock. */
8402 		got_worktree_close(worktree);
8403 		worktree = NULL;
8404 	}
8405 	error = view_loop(view);
8406 done:
8407 	free(repo_path);
8408 	free(cwd);
8409 	if (repo) {
8410 		const struct got_error *close_err = got_repo_close(repo);
8411 		if (close_err)
8412 			error = close_err;
8413 	}
8414 	if (pack_fds) {
8415 		const struct got_error *pack_err =
8416 		    got_repo_pack_fds_close(pack_fds);
8417 		if (error == NULL)
8418 			error = pack_err;
8419 	}
8420 	tog_free_refs();
8421 	return error;
8422 }
8423 
8424 static const struct got_error*
8425 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8426     const char *str)
8427 {
8428 	size_t len;
8429 
8430 	if (win == NULL)
8431 		win = stdscr;
8432 
8433 	len = strlen(str);
8434 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8435 
8436 	if (focus)
8437 		wstandout(win);
8438 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8439 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8440 	if (focus)
8441 		wstandend(win);
8442 
8443 	return NULL;
8444 }
8445 
8446 static const struct got_error *
8447 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8448 {
8449 	off_t *p;
8450 
8451 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8452 	if (p == NULL) {
8453 		free(*line_offsets);
8454 		*line_offsets = NULL;
8455 		return got_error_from_errno("reallocarray");
8456 	}
8457 
8458 	*line_offsets = p;
8459 	(*line_offsets)[*nlines] = off;
8460 	++(*nlines);
8461 	return NULL;
8462 }
8463 
8464 static const struct got_error *
8465 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8466 {
8467 	*ret = 0;
8468 
8469 	for (;n > 0; --n, ++km) {
8470 		char	*t0, *t, *k;
8471 		size_t	 len = 1;
8472 
8473 		if (km->keys == NULL)
8474 			continue;
8475 
8476 		t = t0 = strdup(km->keys);
8477 		if (t0 == NULL)
8478 			return got_error_from_errno("strdup");
8479 
8480 		len += strlen(t);
8481 		while ((k = strsep(&t, " ")) != NULL)
8482 			len += strlen(k) > 1 ? 2 : 0;
8483 		free(t0);
8484 		*ret = MAX(*ret, len);
8485 	}
8486 
8487 	return NULL;
8488 }
8489 
8490 /*
8491  * Write keymap section headers, keys, and key info in km to f.
8492  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8493  * wrap control and symbolic keys in guillemets, else use <>.
8494  */
8495 static const struct got_error *
8496 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8497 {
8498 	int n, len = width;
8499 
8500 	if (km->keys) {
8501 		static const char *u8_glyph[] = {
8502 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8503 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8504 		};
8505 		char	*t0, *t, *k;
8506 		int	 cs, s, first = 1;
8507 
8508 		cs = got_locale_is_utf8();
8509 
8510 		t = t0 = strdup(km->keys);
8511 		if (t0 == NULL)
8512 			return got_error_from_errno("strdup");
8513 
8514 		len = strlen(km->keys);
8515 		while ((k = strsep(&t, " ")) != NULL) {
8516 			s = strlen(k) > 1;  /* control or symbolic key */
8517 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8518 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8519 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8520 			if (n < 0) {
8521 				free(t0);
8522 				return got_error_from_errno("fprintf");
8523 			}
8524 			first = 0;
8525 			len += s ? 2 : 0;
8526 			*off += n;
8527 		}
8528 		free(t0);
8529 	}
8530 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8531 	if (n < 0)
8532 		return got_error_from_errno("fprintf");
8533 	*off += n;
8534 
8535 	return NULL;
8536 }
8537 
8538 static const struct got_error *
8539 format_help(struct tog_help_view_state *s)
8540 {
8541 	const struct got_error		*err = NULL;
8542 	off_t				 off = 0;
8543 	int				 i, max, n, show = s->all;
8544 	static const struct tog_key_map	 km[] = {
8545 #define KEYMAP_(info, type)	{ NULL, (info), type }
8546 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8547 		GENERATE_HELP
8548 #undef KEYMAP_
8549 #undef KEY_
8550 	};
8551 
8552 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8553 	if (err)
8554 		return err;
8555 
8556 	n = nitems(km);
8557 	err = max_key_str(&max, km, n);
8558 	if (err)
8559 		return err;
8560 
8561 	for (i = 0; i < n; ++i) {
8562 		if (km[i].keys == NULL) {
8563 			show = s->all;
8564 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8565 			    km[i].type == s->type || s->all)
8566 				show = 1;
8567 		}
8568 		if (show) {
8569 			err = format_help_line(&off, s->f, &km[i], max);
8570 			if (err)
8571 				return err;
8572 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8573 			if (err)
8574 				return err;
8575 		}
8576 	}
8577 	fputc('\n', s->f);
8578 	++off;
8579 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8580 	return err;
8581 }
8582 
8583 static const struct got_error *
8584 create_help(struct tog_help_view_state *s)
8585 {
8586 	FILE			*f;
8587 	const struct got_error	*err;
8588 
8589 	free(s->line_offsets);
8590 	s->line_offsets = NULL;
8591 	s->nlines = 0;
8592 
8593 	f = got_opentemp();
8594 	if (f == NULL)
8595 		return got_error_from_errno("got_opentemp");
8596 	s->f = f;
8597 
8598 	err = format_help(s);
8599 	if (err)
8600 		return err;
8601 
8602 	if (s->f && fflush(s->f) != 0)
8603 		return got_error_from_errno("fflush");
8604 
8605 	return NULL;
8606 }
8607 
8608 static const struct got_error *
8609 search_start_help_view(struct tog_view *view)
8610 {
8611 	view->state.help.matched_line = 0;
8612 	return NULL;
8613 }
8614 
8615 static void
8616 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8617     size_t *nlines, int **first, int **last, int **match, int **selected)
8618 {
8619 	struct tog_help_view_state *s = &view->state.help;
8620 
8621 	*f = s->f;
8622 	*nlines = s->nlines;
8623 	*line_offsets = s->line_offsets;
8624 	*match = &s->matched_line;
8625 	*first = &s->first_displayed_line;
8626 	*last = &s->last_displayed_line;
8627 	*selected = &s->selected_line;
8628 }
8629 
8630 static const struct got_error *
8631 show_help_view(struct tog_view *view)
8632 {
8633 	struct tog_help_view_state	*s = &view->state.help;
8634 	const struct got_error		*err;
8635 	regmatch_t			*regmatch = &view->regmatch;
8636 	wchar_t				*wline;
8637 	char				*line;
8638 	ssize_t				 linelen;
8639 	size_t				 linesz = 0;
8640 	int				 width, nprinted = 0, rc = 0;
8641 	int				 eos = view->nlines;
8642 
8643 	if (view_is_hsplit_top(view))
8644 		--eos;  /* account for border */
8645 
8646 	s->lineno = 0;
8647 	rewind(s->f);
8648 	werase(view->window);
8649 
8650 	if (view->gline > s->nlines - 1)
8651 		view->gline = s->nlines - 1;
8652 
8653 	err = win_draw_center(view->window, 0, 0, view->ncols,
8654 	    view_needs_focus_indication(view),
8655 	    "tog help (press q to return to tog)");
8656 	if (err)
8657 		return err;
8658 	if (eos <= 1)
8659 		return NULL;
8660 	waddstr(view->window, "\n\n");
8661 	eos -= 2;
8662 
8663 	s->eof = 0;
8664 	view->maxx = 0;
8665 	line = NULL;
8666 	while (eos > 0 && nprinted < eos) {
8667 		attr_t attr = 0;
8668 
8669 		linelen = getline(&line, &linesz, s->f);
8670 		if (linelen == -1) {
8671 			if (!feof(s->f)) {
8672 				free(line);
8673 				return got_ferror(s->f, GOT_ERR_IO);
8674 			}
8675 			s->eof = 1;
8676 			break;
8677 		}
8678 		if (++s->lineno < s->first_displayed_line)
8679 			continue;
8680 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8681 			continue;
8682 		if (s->lineno == view->hiline)
8683 			attr = A_STANDOUT;
8684 
8685 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8686 		    view->x ? 1 : 0);
8687 		if (err) {
8688 			free(line);
8689 			return err;
8690 		}
8691 		view->maxx = MAX(view->maxx, width);
8692 		free(wline);
8693 		wline = NULL;
8694 
8695 		if (attr)
8696 			wattron(view->window, attr);
8697 		if (s->first_displayed_line + nprinted == s->matched_line &&
8698 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8699 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8700 			    view->window, view->x, regmatch);
8701 			if (err) {
8702 				free(line);
8703 				return err;
8704 			}
8705 		} else {
8706 			int skip;
8707 
8708 			err = format_line(&wline, &width, &skip, line,
8709 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8710 			if (err) {
8711 				free(line);
8712 				return err;
8713 			}
8714 			rc = waddwstr(view->window, &wline[skip]);
8715 			free(wline);
8716 			wline = NULL;
8717 			if (rc == ERR)
8718 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8719 		}
8720 		if (s->lineno == view->hiline) {
8721 			while (width++ < view->ncols)
8722 				waddch(view->window, ' ');
8723 		} else {
8724 			if (width <= view->ncols)
8725 				waddch(view->window, '\n');
8726 		}
8727 		if (attr)
8728 			wattroff(view->window, attr);
8729 		if (++nprinted == 1)
8730 			s->first_displayed_line = s->lineno;
8731 	}
8732 	free(line);
8733 	if (nprinted > 0)
8734 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8735 	else
8736 		s->last_displayed_line = s->first_displayed_line;
8737 
8738 	view_border(view);
8739 
8740 	if (s->eof) {
8741 		rc = waddnstr(view->window,
8742 		    "See the tog(1) manual page for full documentation",
8743 		    view->ncols - 1);
8744 		if (rc == ERR)
8745 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8746 	} else {
8747 		wmove(view->window, view->nlines - 1, 0);
8748 		wclrtoeol(view->window);
8749 		wstandout(view->window);
8750 		rc = waddnstr(view->window, "scroll down for more...",
8751 		    view->ncols - 1);
8752 		if (rc == ERR)
8753 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8754 		if (getcurx(view->window) < view->ncols - 6) {
8755 			rc = wprintw(view->window, "[%.0f%%]",
8756 			    100.00 * s->last_displayed_line / s->nlines);
8757 			if (rc == ERR)
8758 				return got_error_msg(GOT_ERR_IO, "wprintw");
8759 		}
8760 		wstandend(view->window);
8761 	}
8762 
8763 	return NULL;
8764 }
8765 
8766 static const struct got_error *
8767 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8768 {
8769 	struct tog_help_view_state	*s = &view->state.help;
8770 	const struct got_error		*err = NULL;
8771 	char				*line = NULL;
8772 	ssize_t				 linelen;
8773 	size_t				 linesz = 0;
8774 	int				 eos, nscroll;
8775 
8776 	eos = nscroll = view->nlines;
8777 	if (view_is_hsplit_top(view))
8778 		--eos;  /* border */
8779 
8780 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8781 
8782 	switch (ch) {
8783 	case '0':
8784 		view->x = 0;
8785 		break;
8786 	case '$':
8787 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8788 		view->count = 0;
8789 		break;
8790 	case KEY_RIGHT:
8791 	case 'l':
8792 		if (view->x + view->ncols / 3 < view->maxx)
8793 			view->x += 2;
8794 		else
8795 			view->count = 0;
8796 		break;
8797 	case KEY_LEFT:
8798 	case 'h':
8799 		view->x -= MIN(view->x, 2);
8800 		if (view->x <= 0)
8801 			view->count = 0;
8802 		break;
8803 	case 'g':
8804 	case KEY_HOME:
8805 		s->first_displayed_line = 1;
8806 		view->count = 0;
8807 		break;
8808 	case 'G':
8809 	case KEY_END:
8810 		view->count = 0;
8811 		if (s->eof)
8812 			break;
8813 		s->first_displayed_line = (s->nlines - eos) + 3;
8814 		s->eof = 1;
8815 		break;
8816 	case 'k':
8817 	case KEY_UP:
8818 		if (s->first_displayed_line > 1)
8819 			--s->first_displayed_line;
8820 		else
8821 			view->count = 0;
8822 		break;
8823 	case CTRL('u'):
8824 	case 'u':
8825 		nscroll /= 2;
8826 		/* FALL THROUGH */
8827 	case KEY_PPAGE:
8828 	case CTRL('b'):
8829 	case 'b':
8830 		if (s->first_displayed_line == 1) {
8831 			view->count = 0;
8832 			break;
8833 		}
8834 		while (--nscroll > 0 && s->first_displayed_line > 1)
8835 			s->first_displayed_line--;
8836 		break;
8837 	case 'j':
8838 	case KEY_DOWN:
8839 	case CTRL('n'):
8840 		if (!s->eof)
8841 			++s->first_displayed_line;
8842 		else
8843 			view->count = 0;
8844 		break;
8845 	case CTRL('d'):
8846 	case 'd':
8847 		nscroll /= 2;
8848 		/* FALL THROUGH */
8849 	case KEY_NPAGE:
8850 	case CTRL('f'):
8851 	case 'f':
8852 	case ' ':
8853 		if (s->eof) {
8854 			view->count = 0;
8855 			break;
8856 		}
8857 		while (!s->eof && --nscroll > 0) {
8858 			linelen = getline(&line, &linesz, s->f);
8859 			s->first_displayed_line++;
8860 			if (linelen == -1) {
8861 				if (feof(s->f))
8862 					s->eof = 1;
8863 				else
8864 					err = got_ferror(s->f, GOT_ERR_IO);
8865 				break;
8866 			}
8867 		}
8868 		free(line);
8869 		break;
8870 	default:
8871 		view->count = 0;
8872 		break;
8873 	}
8874 
8875 	return err;
8876 }
8877 
8878 static const struct got_error *
8879 close_help_view(struct tog_view *view)
8880 {
8881 	struct tog_help_view_state *s = &view->state.help;
8882 
8883 	free(s->line_offsets);
8884 	s->line_offsets = NULL;
8885 	if (fclose(s->f) == EOF)
8886 		return got_error_from_errno("fclose");
8887 
8888 	return NULL;
8889 }
8890 
8891 static const struct got_error *
8892 reset_help_view(struct tog_view *view)
8893 {
8894 	struct tog_help_view_state *s = &view->state.help;
8895 
8896 
8897 	if (s->f && fclose(s->f) == EOF)
8898 		return got_error_from_errno("fclose");
8899 
8900 	wclear(view->window);
8901 	view->count = 0;
8902 	view->x = 0;
8903 	s->all = !s->all;
8904 	s->first_displayed_line = 1;
8905 	s->last_displayed_line = view->nlines;
8906 	s->matched_line = 0;
8907 
8908 	return create_help(s);
8909 }
8910 
8911 static const struct got_error *
8912 open_help_view(struct tog_view *view, struct tog_view *parent)
8913 {
8914 	const struct got_error		*err = NULL;
8915 	struct tog_help_view_state	*s = &view->state.help;
8916 
8917 	s->type = (enum tog_keymap_type)parent->type;
8918 	s->first_displayed_line = 1;
8919 	s->last_displayed_line = view->nlines;
8920 	s->selected_line = 1;
8921 
8922 	view->show = show_help_view;
8923 	view->input = input_help_view;
8924 	view->reset = reset_help_view;
8925 	view->close = close_help_view;
8926 	view->search_start = search_start_help_view;
8927 	view->search_setup = search_setup_help_view;
8928 	view->search_next = search_next_view_match;
8929 
8930 	err = create_help(s);
8931 	return err;
8932 }
8933 
8934 static const struct got_error *
8935 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8936     enum tog_view_type request, int y, int x)
8937 {
8938 	const struct got_error *err = NULL;
8939 
8940 	*new_view = NULL;
8941 
8942 	switch (request) {
8943 	case TOG_VIEW_DIFF:
8944 		if (view->type == TOG_VIEW_LOG) {
8945 			struct tog_log_view_state *s = &view->state.log;
8946 
8947 			err = open_diff_view_for_commit(new_view, y, x,
8948 			    s->selected_entry->commit, s->selected_entry->id,
8949 			    view, s->repo);
8950 		} else
8951 			return got_error_msg(GOT_ERR_NOT_IMPL,
8952 			    "parent/child view pair not supported");
8953 		break;
8954 	case TOG_VIEW_BLAME:
8955 		if (view->type == TOG_VIEW_TREE) {
8956 			struct tog_tree_view_state *s = &view->state.tree;
8957 
8958 			err = blame_tree_entry(new_view, y, x,
8959 			    s->selected_entry, &s->parents, s->commit_id,
8960 			    s->repo);
8961 		} else
8962 			return got_error_msg(GOT_ERR_NOT_IMPL,
8963 			    "parent/child view pair not supported");
8964 		break;
8965 	case TOG_VIEW_LOG:
8966 		if (view->type == TOG_VIEW_BLAME)
8967 			err = log_annotated_line(new_view, y, x,
8968 			    view->state.blame.repo, view->state.blame.id_to_log);
8969 		else if (view->type == TOG_VIEW_TREE)
8970 			err = log_selected_tree_entry(new_view, y, x,
8971 			    &view->state.tree);
8972 		else if (view->type == TOG_VIEW_REF)
8973 			err = log_ref_entry(new_view, y, x,
8974 			    view->state.ref.selected_entry,
8975 			    view->state.ref.repo);
8976 		else
8977 			return got_error_msg(GOT_ERR_NOT_IMPL,
8978 			    "parent/child view pair not supported");
8979 		break;
8980 	case TOG_VIEW_TREE:
8981 		if (view->type == TOG_VIEW_LOG)
8982 			err = browse_commit_tree(new_view, y, x,
8983 			    view->state.log.selected_entry,
8984 			    view->state.log.in_repo_path,
8985 			    view->state.log.head_ref_name,
8986 			    view->state.log.repo);
8987 		else if (view->type == TOG_VIEW_REF)
8988 			err = browse_ref_tree(new_view, y, x,
8989 			    view->state.ref.selected_entry,
8990 			    view->state.ref.repo);
8991 		else
8992 			return got_error_msg(GOT_ERR_NOT_IMPL,
8993 			    "parent/child view pair not supported");
8994 		break;
8995 	case TOG_VIEW_REF:
8996 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8997 		if (*new_view == NULL)
8998 			return got_error_from_errno("view_open");
8999 		if (view->type == TOG_VIEW_LOG)
9000 			err = open_ref_view(*new_view, view->state.log.repo);
9001 		else if (view->type == TOG_VIEW_TREE)
9002 			err = open_ref_view(*new_view, view->state.tree.repo);
9003 		else
9004 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9005 			    "parent/child view pair not supported");
9006 		if (err)
9007 			view_close(*new_view);
9008 		break;
9009 	case TOG_VIEW_HELP:
9010 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9011 		if (*new_view == NULL)
9012 			return got_error_from_errno("view_open");
9013 		err = open_help_view(*new_view, view);
9014 		if (err)
9015 			view_close(*new_view);
9016 		break;
9017 	default:
9018 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9019 	}
9020 
9021 	return err;
9022 }
9023 
9024 /*
9025  * If view was scrolled down to move the selected line into view when opening a
9026  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9027  */
9028 static void
9029 offset_selection_up(struct tog_view *view)
9030 {
9031 	switch (view->type) {
9032 	case TOG_VIEW_BLAME: {
9033 		struct tog_blame_view_state *s = &view->state.blame;
9034 		if (s->first_displayed_line == 1) {
9035 			s->selected_line = MAX(s->selected_line - view->offset,
9036 			    1);
9037 			break;
9038 		}
9039 		if (s->first_displayed_line > view->offset)
9040 			s->first_displayed_line -= view->offset;
9041 		else
9042 			s->first_displayed_line = 1;
9043 		s->selected_line += view->offset;
9044 		break;
9045 	}
9046 	case TOG_VIEW_LOG:
9047 		log_scroll_up(&view->state.log, view->offset);
9048 		view->state.log.selected += view->offset;
9049 		break;
9050 	case TOG_VIEW_REF:
9051 		ref_scroll_up(&view->state.ref, view->offset);
9052 		view->state.ref.selected += view->offset;
9053 		break;
9054 	case TOG_VIEW_TREE:
9055 		tree_scroll_up(&view->state.tree, view->offset);
9056 		view->state.tree.selected += view->offset;
9057 		break;
9058 	default:
9059 		break;
9060 	}
9061 
9062 	view->offset = 0;
9063 }
9064 
9065 /*
9066  * If the selected line is in the section of screen covered by the bottom split,
9067  * scroll down offset lines to move it into view and index its new position.
9068  */
9069 static const struct got_error *
9070 offset_selection_down(struct tog_view *view)
9071 {
9072 	const struct got_error	*err = NULL;
9073 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9074 	int			*selected = NULL;
9075 	int			 header, offset;
9076 
9077 	switch (view->type) {
9078 	case TOG_VIEW_BLAME: {
9079 		struct tog_blame_view_state *s = &view->state.blame;
9080 		header = 3;
9081 		scrolld = NULL;
9082 		if (s->selected_line > view->nlines - header) {
9083 			offset = abs(view->nlines - s->selected_line - header);
9084 			s->first_displayed_line += offset;
9085 			s->selected_line -= offset;
9086 			view->offset = offset;
9087 		}
9088 		break;
9089 	}
9090 	case TOG_VIEW_LOG: {
9091 		struct tog_log_view_state *s = &view->state.log;
9092 		scrolld = &log_scroll_down;
9093 		header = view_is_parent_view(view) ? 3 : 2;
9094 		selected = &s->selected;
9095 		break;
9096 	}
9097 	case TOG_VIEW_REF: {
9098 		struct tog_ref_view_state *s = &view->state.ref;
9099 		scrolld = &ref_scroll_down;
9100 		header = 3;
9101 		selected = &s->selected;
9102 		break;
9103 	}
9104 	case TOG_VIEW_TREE: {
9105 		struct tog_tree_view_state *s = &view->state.tree;
9106 		scrolld = &tree_scroll_down;
9107 		header = 5;
9108 		selected = &s->selected;
9109 		break;
9110 	}
9111 	default:
9112 		selected = NULL;
9113 		scrolld = NULL;
9114 		header = 0;
9115 		break;
9116 	}
9117 
9118 	if (selected && *selected > view->nlines - header) {
9119 		offset = abs(view->nlines - *selected - header);
9120 		view->offset = offset;
9121 		if (scrolld && offset) {
9122 			err = scrolld(view, offset);
9123 			*selected -= offset;
9124 		}
9125 	}
9126 
9127 	return err;
9128 }
9129 
9130 static void
9131 list_commands(FILE *fp)
9132 {
9133 	size_t i;
9134 
9135 	fprintf(fp, "commands:");
9136 	for (i = 0; i < nitems(tog_commands); i++) {
9137 		const struct tog_cmd *cmd = &tog_commands[i];
9138 		fprintf(fp, " %s", cmd->name);
9139 	}
9140 	fputc('\n', fp);
9141 }
9142 
9143 __dead static void
9144 usage(int hflag, int status)
9145 {
9146 	FILE *fp = (status == 0) ? stdout : stderr;
9147 
9148 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9149 	    getprogname());
9150 	if (hflag) {
9151 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9152 		list_commands(fp);
9153 	}
9154 	exit(status);
9155 }
9156 
9157 static char **
9158 make_argv(int argc, ...)
9159 {
9160 	va_list ap;
9161 	char **argv;
9162 	int i;
9163 
9164 	va_start(ap, argc);
9165 
9166 	argv = calloc(argc, sizeof(char *));
9167 	if (argv == NULL)
9168 		err(1, "calloc");
9169 	for (i = 0; i < argc; i++) {
9170 		argv[i] = strdup(va_arg(ap, char *));
9171 		if (argv[i] == NULL)
9172 			err(1, "strdup");
9173 	}
9174 
9175 	va_end(ap);
9176 	return argv;
9177 }
9178 
9179 /*
9180  * Try to convert 'tog path' into a 'tog log path' command.
9181  * The user could simply have mistyped the command rather than knowingly
9182  * provided a path. So check whether argv[0] can in fact be resolved
9183  * to a path in the HEAD commit and print a special error if not.
9184  * This hack is for mpi@ <3
9185  */
9186 static const struct got_error *
9187 tog_log_with_path(int argc, char *argv[])
9188 {
9189 	const struct got_error *error = NULL, *close_err;
9190 	const struct tog_cmd *cmd = NULL;
9191 	struct got_repository *repo = NULL;
9192 	struct got_worktree *worktree = NULL;
9193 	struct got_object_id *commit_id = NULL, *id = NULL;
9194 	struct got_commit_object *commit = NULL;
9195 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9196 	char *commit_id_str = NULL, **cmd_argv = NULL;
9197 	int *pack_fds = NULL;
9198 
9199 	cwd = getcwd(NULL, 0);
9200 	if (cwd == NULL)
9201 		return got_error_from_errno("getcwd");
9202 
9203 	error = got_repo_pack_fds_open(&pack_fds);
9204 	if (error != NULL)
9205 		goto done;
9206 
9207 	error = got_worktree_open(&worktree, cwd);
9208 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9209 		goto done;
9210 
9211 	if (worktree)
9212 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9213 	else
9214 		repo_path = strdup(cwd);
9215 	if (repo_path == NULL) {
9216 		error = got_error_from_errno("strdup");
9217 		goto done;
9218 	}
9219 
9220 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9221 	if (error != NULL)
9222 		goto done;
9223 
9224 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9225 	    repo, worktree);
9226 	if (error)
9227 		goto done;
9228 
9229 	error = tog_load_refs(repo, 0);
9230 	if (error)
9231 		goto done;
9232 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9233 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9234 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9235 	if (error)
9236 		goto done;
9237 
9238 	if (worktree) {
9239 		got_worktree_close(worktree);
9240 		worktree = NULL;
9241 	}
9242 
9243 	error = got_object_open_as_commit(&commit, repo, commit_id);
9244 	if (error)
9245 		goto done;
9246 
9247 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9248 	if (error) {
9249 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9250 			goto done;
9251 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9252 		    getprogname(), argv[0]);
9253 		usage(1, 1);
9254 		/* not reached */
9255 	}
9256 
9257 	error = got_object_id_str(&commit_id_str, commit_id);
9258 	if (error)
9259 		goto done;
9260 
9261 	cmd = &tog_commands[0]; /* log */
9262 	argc = 4;
9263 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9264 	error = cmd->cmd_main(argc, cmd_argv);
9265 done:
9266 	if (repo) {
9267 		close_err = got_repo_close(repo);
9268 		if (error == NULL)
9269 			error = close_err;
9270 	}
9271 	if (commit)
9272 		got_object_commit_close(commit);
9273 	if (worktree)
9274 		got_worktree_close(worktree);
9275 	if (pack_fds) {
9276 		const struct got_error *pack_err =
9277 		    got_repo_pack_fds_close(pack_fds);
9278 		if (error == NULL)
9279 			error = pack_err;
9280 	}
9281 	free(id);
9282 	free(commit_id_str);
9283 	free(commit_id);
9284 	free(cwd);
9285 	free(repo_path);
9286 	free(in_repo_path);
9287 	if (cmd_argv) {
9288 		int i;
9289 		for (i = 0; i < argc; i++)
9290 			free(cmd_argv[i]);
9291 		free(cmd_argv);
9292 	}
9293 	tog_free_refs();
9294 	return error;
9295 }
9296 
9297 int
9298 main(int argc, char *argv[])
9299 {
9300 	const struct got_error *error = NULL;
9301 	const struct tog_cmd *cmd = NULL;
9302 	int ch, hflag = 0, Vflag = 0;
9303 	char **cmd_argv = NULL;
9304 	static const struct option longopts[] = {
9305 	    { "version", no_argument, NULL, 'V' },
9306 	    { NULL, 0, NULL, 0}
9307 	};
9308 	char *diff_algo_str = NULL;
9309 
9310 	if (!isatty(STDIN_FILENO))
9311 		errx(1, "standard input is not a tty");
9312 
9313 	setlocale(LC_CTYPE, "");
9314 
9315 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9316 		switch (ch) {
9317 		case 'h':
9318 			hflag = 1;
9319 			break;
9320 		case 'V':
9321 			Vflag = 1;
9322 			break;
9323 		default:
9324 			usage(hflag, 1);
9325 			/* NOTREACHED */
9326 		}
9327 	}
9328 
9329 	argc -= optind;
9330 	argv += optind;
9331 	optind = 1;
9332 	optreset = 1;
9333 
9334 	if (Vflag) {
9335 		got_version_print_str();
9336 		return 0;
9337 	}
9338 
9339 #ifndef PROFILE
9340 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9341 	    NULL) == -1)
9342 		err(1, "pledge");
9343 #endif
9344 
9345 	if (argc == 0) {
9346 		if (hflag)
9347 			usage(hflag, 0);
9348 		/* Build an argument vector which runs a default command. */
9349 		cmd = &tog_commands[0];
9350 		argc = 1;
9351 		cmd_argv = make_argv(argc, cmd->name);
9352 	} else {
9353 		size_t i;
9354 
9355 		/* Did the user specify a command? */
9356 		for (i = 0; i < nitems(tog_commands); i++) {
9357 			if (strncmp(tog_commands[i].name, argv[0],
9358 			    strlen(argv[0])) == 0) {
9359 				cmd = &tog_commands[i];
9360 				break;
9361 			}
9362 		}
9363 	}
9364 
9365 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9366 	if (diff_algo_str) {
9367 		if (strcasecmp(diff_algo_str, "patience") == 0)
9368 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9369 		if (strcasecmp(diff_algo_str, "myers") == 0)
9370 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9371 	}
9372 
9373 	if (cmd == NULL) {
9374 		if (argc != 1)
9375 			usage(0, 1);
9376 		/* No command specified; try log with a path */
9377 		error = tog_log_with_path(argc, argv);
9378 	} else {
9379 		if (hflag)
9380 			cmd->cmd_usage();
9381 		else
9382 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9383 	}
9384 
9385 	endwin();
9386 	putchar('\n');
9387 	if (cmd_argv) {
9388 		int i;
9389 		for (i = 0; i < argc; i++)
9390 			free(cmd_argv[i]);
9391 		free(cmd_argv);
9392 	}
9393 
9394 	if (error && error->code != GOT_ERR_CANCELLED &&
9395 	    error->code != GOT_ERR_EOF &&
9396 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9397 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9398 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9399 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9400 	return 0;
9401 }