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