1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 	TOG_VIEW_HELP
107 };
108 
109 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
110 enum tog_keymap_type {
111 	TOG_KEYMAP_KEYS = -2,
112 	TOG_KEYMAP_GLOBAL,
113 	TOG_KEYMAP_DIFF,
114 	TOG_KEYMAP_LOG,
115 	TOG_KEYMAP_BLAME,
116 	TOG_KEYMAP_TREE,
117 	TOG_KEYMAP_REF,
118 	TOG_KEYMAP_HELP
119 };
120 
121 enum tog_view_mode {
122 	TOG_VIEW_SPLIT_NONE,
123 	TOG_VIEW_SPLIT_VERT,
124 	TOG_VIEW_SPLIT_HRZN
125 };
126 
127 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
128 
129 #define TOG_EOF_STRING	"(END)"
130 
131 struct commit_queue_entry {
132 	TAILQ_ENTRY(commit_queue_entry) entry;
133 	struct got_object_id *id;
134 	struct got_commit_object *commit;
135 	int idx;
136 };
137 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
138 struct commit_queue {
139 	int ncommits;
140 	struct commit_queue_head head;
141 };
142 
143 struct tog_color {
144 	STAILQ_ENTRY(tog_color) entry;
145 	regex_t regex;
146 	short colorpair;
147 };
148 STAILQ_HEAD(tog_colors, tog_color);
149 
150 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
151 static struct got_reflist_object_id_map *tog_refs_idmap;
152 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
153 
154 static const struct got_error *
155 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
156     struct got_reference* re2)
157 {
158 	const char *name1 = got_ref_get_name(re1);
159 	const char *name2 = got_ref_get_name(re2);
160 	int isbackup1, isbackup2;
161 
162 	/* Sort backup refs towards the bottom of the list. */
163 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
164 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
165 	if (!isbackup1 && isbackup2) {
166 		*cmp = -1;
167 		return NULL;
168 	} else if (isbackup1 && !isbackup2) {
169 		*cmp = 1;
170 		return NULL;
171 	}
172 
173 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 tog_load_refs(struct got_repository *repo, int sort_by_date)
179 {
180 	const struct got_error *err;
181 
182 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
183 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
184 	    repo);
185 	if (err)
186 		return err;
187 
188 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
189 	    repo);
190 }
191 
192 static void
193 tog_free_refs(void)
194 {
195 	if (tog_refs_idmap) {
196 		got_reflist_object_id_map_free(tog_refs_idmap);
197 		tog_refs_idmap = NULL;
198 	}
199 	got_ref_list_free(&tog_refs);
200 }
201 
202 static const struct got_error *
203 add_color(struct tog_colors *colors, const char *pattern,
204     int idx, short color)
205 {
206 	const struct got_error *err = NULL;
207 	struct tog_color *tc;
208 	int regerr = 0;
209 
210 	if (idx < 1 || idx > COLOR_PAIRS - 1)
211 		return NULL;
212 
213 	init_pair(idx, color, -1);
214 
215 	tc = calloc(1, sizeof(*tc));
216 	if (tc == NULL)
217 		return got_error_from_errno("calloc");
218 	regerr = regcomp(&tc->regex, pattern,
219 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
220 	if (regerr) {
221 		static char regerr_msg[512];
222 		static char err_msg[512];
223 		regerror(regerr, &tc->regex, regerr_msg,
224 		    sizeof(regerr_msg));
225 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
226 		    regerr_msg);
227 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
228 		free(tc);
229 		return err;
230 	}
231 	tc->colorpair = idx;
232 	STAILQ_INSERT_HEAD(colors, tc, entry);
233 	return NULL;
234 }
235 
236 static void
237 free_colors(struct tog_colors *colors)
238 {
239 	struct tog_color *tc;
240 
241 	while (!STAILQ_EMPTY(colors)) {
242 		tc = STAILQ_FIRST(colors);
243 		STAILQ_REMOVE_HEAD(colors, entry);
244 		regfree(&tc->regex);
245 		free(tc);
246 	}
247 }
248 
249 static struct tog_color *
250 get_color(struct tog_colors *colors, int colorpair)
251 {
252 	struct tog_color *tc = NULL;
253 
254 	STAILQ_FOREACH(tc, colors, entry) {
255 		if (tc->colorpair == colorpair)
256 			return tc;
257 	}
258 
259 	return NULL;
260 }
261 
262 static int
263 default_color_value(const char *envvar)
264 {
265 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
268 		return COLOR_CYAN;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
274 		return COLOR_MAGENTA;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
278 		return COLOR_CYAN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
286 		return COLOR_YELLOW;
287 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
290 		return COLOR_MAGENTA;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
294 		return COLOR_CYAN;
295 
296 	return -1;
297 }
298 
299 static int
300 get_color_value(const char *envvar)
301 {
302 	const char *val = getenv(envvar);
303 
304 	if (val == NULL)
305 		return default_color_value(envvar);
306 
307 	if (strcasecmp(val, "black") == 0)
308 		return COLOR_BLACK;
309 	if (strcasecmp(val, "red") == 0)
310 		return COLOR_RED;
311 	if (strcasecmp(val, "green") == 0)
312 		return COLOR_GREEN;
313 	if (strcasecmp(val, "yellow") == 0)
314 		return COLOR_YELLOW;
315 	if (strcasecmp(val, "blue") == 0)
316 		return COLOR_BLUE;
317 	if (strcasecmp(val, "magenta") == 0)
318 		return COLOR_MAGENTA;
319 	if (strcasecmp(val, "cyan") == 0)
320 		return COLOR_CYAN;
321 	if (strcasecmp(val, "white") == 0)
322 		return COLOR_WHITE;
323 	if (strcasecmp(val, "default") == 0)
324 		return -1;
325 
326 	return default_color_value(envvar);
327 }
328 
329 struct tog_diff_view_state {
330 	struct got_object_id *id1, *id2;
331 	const char *label1, *label2;
332 	FILE *f, *f1, *f2;
333 	int fd1, fd2;
334 	int lineno;
335 	int first_displayed_line;
336 	int last_displayed_line;
337 	int eof;
338 	int diff_context;
339 	int ignore_whitespace;
340 	int force_text_diff;
341 	struct got_repository *repo;
342 	struct got_diff_line *lines;
343 	size_t nlines;
344 	int matched_line;
345 	int selected_line;
346 
347 	/* passed from log or blame view; may be NULL */
348 	struct tog_view *parent_view;
349 };
350 
351 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
352 static volatile sig_atomic_t tog_thread_error;
353 
354 struct tog_log_thread_args {
355 	pthread_cond_t need_commits;
356 	pthread_cond_t commit_loaded;
357 	int commits_needed;
358 	int load_all;
359 	struct got_commit_graph *graph;
360 	struct commit_queue *real_commits;
361 	const char *in_repo_path;
362 	struct got_object_id *start_id;
363 	struct got_repository *repo;
364 	int *pack_fds;
365 	int log_complete;
366 	sig_atomic_t *quit;
367 	struct commit_queue_entry **first_displayed_entry;
368 	struct commit_queue_entry **selected_entry;
369 	int *searching;
370 	int *search_next_done;
371 	regex_t *regex;
372 	int *limiting;
373 	int limit_match;
374 	regex_t *limit_regex;
375 	struct commit_queue *limit_commits;
376 };
377 
378 struct tog_log_view_state {
379 	struct commit_queue *commits;
380 	struct commit_queue_entry *first_displayed_entry;
381 	struct commit_queue_entry *last_displayed_entry;
382 	struct commit_queue_entry *selected_entry;
383 	struct commit_queue real_commits;
384 	int selected;
385 	char *in_repo_path;
386 	char *head_ref_name;
387 	int log_branches;
388 	struct got_repository *repo;
389 	struct got_object_id *start_id;
390 	sig_atomic_t quit;
391 	pthread_t thread;
392 	struct tog_log_thread_args thread_args;
393 	struct commit_queue_entry *matched_entry;
394 	struct commit_queue_entry *search_entry;
395 	struct tog_colors colors;
396 	int use_committer;
397 	int limit_view;
398 	regex_t limit_regex;
399 	struct commit_queue limit_commits;
400 };
401 
402 #define TOG_COLOR_DIFF_MINUS		1
403 #define TOG_COLOR_DIFF_PLUS		2
404 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
405 #define TOG_COLOR_DIFF_META		4
406 #define TOG_COLOR_TREE_SUBMODULE	5
407 #define TOG_COLOR_TREE_SYMLINK		6
408 #define TOG_COLOR_TREE_DIRECTORY	7
409 #define TOG_COLOR_TREE_EXECUTABLE	8
410 #define TOG_COLOR_COMMIT		9
411 #define TOG_COLOR_AUTHOR		10
412 #define TOG_COLOR_DATE			11
413 #define TOG_COLOR_REFS_HEADS		12
414 #define TOG_COLOR_REFS_TAGS		13
415 #define TOG_COLOR_REFS_REMOTES		14
416 #define TOG_COLOR_REFS_BACKUP		15
417 
418 struct tog_blame_cb_args {
419 	struct tog_blame_line *lines; /* one per line */
420 	int nlines;
421 
422 	struct tog_view *view;
423 	struct got_object_id *commit_id;
424 	int *quit;
425 };
426 
427 struct tog_blame_thread_args {
428 	const char *path;
429 	struct got_repository *repo;
430 	struct tog_blame_cb_args *cb_args;
431 	int *complete;
432 	got_cancel_cb cancel_cb;
433 	void *cancel_arg;
434 };
435 
436 struct tog_blame {
437 	FILE *f;
438 	off_t filesize;
439 	struct tog_blame_line *lines;
440 	int nlines;
441 	off_t *line_offsets;
442 	pthread_t thread;
443 	struct tog_blame_thread_args thread_args;
444 	struct tog_blame_cb_args cb_args;
445 	const char *path;
446 	int *pack_fds;
447 };
448 
449 struct tog_blame_view_state {
450 	int first_displayed_line;
451 	int last_displayed_line;
452 	int selected_line;
453 	int last_diffed_line;
454 	int blame_complete;
455 	int eof;
456 	int done;
457 	struct got_object_id_queue blamed_commits;
458 	struct got_object_qid *blamed_commit;
459 	char *path;
460 	struct got_repository *repo;
461 	struct got_object_id *commit_id;
462 	struct got_object_id *id_to_log;
463 	struct tog_blame blame;
464 	int matched_line;
465 	struct tog_colors colors;
466 };
467 
468 struct tog_parent_tree {
469 	TAILQ_ENTRY(tog_parent_tree) entry;
470 	struct got_tree_object *tree;
471 	struct got_tree_entry *first_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int selected;
474 };
475 
476 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
477 
478 struct tog_tree_view_state {
479 	char *tree_label;
480 	struct got_object_id *commit_id;/* commit which this tree belongs to */
481 	struct got_tree_object *root;	/* the commit's root tree entry */
482 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
483 	struct got_tree_entry *first_displayed_entry;
484 	struct got_tree_entry *last_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int ndisplayed, selected, show_ids;
487 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
488 	char *head_ref_name;
489 	struct got_repository *repo;
490 	struct got_tree_entry *matched_entry;
491 	struct tog_colors colors;
492 };
493 
494 struct tog_reflist_entry {
495 	TAILQ_ENTRY(tog_reflist_entry) entry;
496 	struct got_reference *ref;
497 	int idx;
498 };
499 
500 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
501 
502 struct tog_ref_view_state {
503 	struct tog_reflist_head refs;
504 	struct tog_reflist_entry *first_displayed_entry;
505 	struct tog_reflist_entry *last_displayed_entry;
506 	struct tog_reflist_entry *selected_entry;
507 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
508 	struct got_repository *repo;
509 	struct tog_reflist_entry *matched_entry;
510 	struct tog_colors colors;
511 };
512 
513 struct tog_help_view_state {
514 	FILE			*f;
515 	off_t			*line_offsets;
516 	size_t			 nlines;
517 	int			 lineno;
518 	int			 first_displayed_line;
519 	int			 last_displayed_line;
520 	int			 eof;
521 	int			 matched_line;
522 	int			 selected_line;
523 	int			 all;
524 	enum tog_keymap_type	 type;
525 };
526 
527 #define GENERATE_HELP \
528 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
529 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
530 	KEY_("k C-p Up", "Move cursor or page up one line"), \
531 	KEY_("j C-n Down", "Move cursor or page down one line"), \
532 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
533 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
534 	KEY_("C-u u", "Scroll the view up one half page"), \
535 	KEY_("C-d d", "Scroll the view down one half page"), \
536 	KEY_("g", "Go to line N (default: first line)"), \
537 	KEY_("Home =", "Go to the first line"), \
538 	KEY_("G", "Go to line N (default: last line)"), \
539 	KEY_("End *", "Go to the last line"), \
540 	KEY_("l Right", "Scroll the view right"), \
541 	KEY_("h Left", "Scroll the view left"), \
542 	KEY_("$", "Scroll view to the rightmost position"), \
543 	KEY_("0", "Scroll view to the leftmost position"), \
544 	KEY_("-", "Decrease size of the focussed split"), \
545 	KEY_("+", "Increase size of the focussed split"), \
546 	KEY_("Tab", "Switch focus between views"), \
547 	KEY_("F", "Toggle fullscreen mode"), \
548 	KEY_("/", "Open prompt to enter search term"), \
549 	KEY_("n", "Find next line/token matching the current search term"), \
550 	KEY_("N", "Find previous line/token matching the current search term"),\
551 	KEY_("q", "Quit the focussed view; Quit help screen"), \
552 	KEY_("Q", "Quit tog"), \
553 	\
554 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
555 	KEY_("< ,", "Move cursor up one commit"), \
556 	KEY_("> .", "Move cursor down one commit"), \
557 	KEY_("Enter", "Open diff view of the selected commit"), \
558 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
559 	KEY_("R", "Open ref view of all repository references"), \
560 	KEY_("T", "Display tree view of the repository from the selected" \
561 	    " commit"), \
562 	KEY_("@", "Toggle between displaying author and committer name"), \
563 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
564 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
565 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
566 	\
567 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
568 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
569 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
570 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
571 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
572 	    " data"), \
573 	KEY_("(", "Go to the previous file in the diff"), \
574 	KEY_(")", "Go to the next file in the diff"), \
575 	KEY_("{", "Go to the previous hunk in the diff"), \
576 	KEY_("}", "Go to the next hunk in the diff"), \
577 	KEY_("[", "Decrease the number of context lines"), \
578 	KEY_("]", "Increase the number of context lines"), \
579 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
580 	\
581 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
582 	KEY_("Enter", "Display diff view of the selected line's commit"), \
583 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
584 	KEY_("L", "Open log view for the currently selected annotated line"), \
585 	KEY_("C", "Reload view with the previously blamed commit"), \
586 	KEY_("c", "Reload view with the version of the file found in the" \
587 	    " selected line's commit"), \
588 	KEY_("p", "Reload view with the version of the file found in the" \
589 	    " selected line's parent commit"), \
590 	\
591 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
592 	KEY_("Enter", "Enter selected directory or open blame view of the" \
593 	    " selected file"), \
594 	KEY_("L", "Open log view for the selected entry"), \
595 	KEY_("R", "Open ref view of all repository references"), \
596 	KEY_("i", "Show object IDs for all tree entries"), \
597 	KEY_("Backspace", "Return to the parent directory"), \
598 	\
599 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
600 	KEY_("Enter", "Display log view of the selected reference"), \
601 	KEY_("T", "Display tree view of the selected reference"), \
602 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
603 	KEY_("m", "Toggle display of last modified date for each reference"), \
604 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
605 	KEY_("C-l", "Reload view with all repository references")
606 
607 struct tog_key_map {
608 	const char		*keys;
609 	const char		*info;
610 	enum tog_keymap_type	 type;
611 };
612 
613 /*
614  * We implement two types of views: parent views and child views.
615  *
616  * The 'Tab' key switches focus between a parent view and its child view.
617  * Child views are shown side-by-side to their parent view, provided
618  * there is enough screen estate.
619  *
620  * When a new view is opened from within a parent view, this new view
621  * becomes a child view of the parent view, replacing any existing child.
622  *
623  * When a new view is opened from within a child view, this new view
624  * becomes a parent view which will obscure the views below until the
625  * user quits the new parent view by typing 'q'.
626  *
627  * This list of views contains parent views only.
628  * Child views are only pointed to by their parent view.
629  */
630 TAILQ_HEAD(tog_view_list_head, tog_view);
631 
632 struct tog_view {
633 	TAILQ_ENTRY(tog_view) entry;
634 	WINDOW *window;
635 	PANEL *panel;
636 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
637 	int resized_y, resized_x; /* begin_y/x based on user resizing */
638 	int maxx, x; /* max column and current start column */
639 	int lines, cols; /* copies of LINES and COLS */
640 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
641 	int gline, hiline; /* navigate to and highlight this nG line */
642 	int ch, count; /* current keymap and count prefix */
643 	int resized; /* set when in a resize event */
644 	int focussed; /* Only set on one parent or child view at a time. */
645 	int dying;
646 	struct tog_view *parent;
647 	struct tog_view *child;
648 
649 	/*
650 	 * This flag is initially set on parent views when a new child view
651 	 * is created. It gets toggled when the 'Tab' key switches focus
652 	 * between parent and child.
653 	 * The flag indicates whether focus should be passed on to our child
654 	 * view if this parent view gets picked for focus after another parent
655 	 * view was closed. This prevents child views from losing focus in such
656 	 * situations.
657 	 */
658 	int focus_child;
659 
660 	enum tog_view_mode mode;
661 	/* type-specific state */
662 	enum tog_view_type type;
663 	union {
664 		struct tog_diff_view_state diff;
665 		struct tog_log_view_state log;
666 		struct tog_blame_view_state blame;
667 		struct tog_tree_view_state tree;
668 		struct tog_ref_view_state ref;
669 		struct tog_help_view_state help;
670 	} state;
671 
672 	const struct got_error *(*show)(struct tog_view *);
673 	const struct got_error *(*input)(struct tog_view **,
674 	    struct tog_view *, int);
675 	const struct got_error *(*reset)(struct tog_view *);
676 	const struct got_error *(*resize)(struct tog_view *, int);
677 	const struct got_error *(*close)(struct tog_view *);
678 
679 	const struct got_error *(*search_start)(struct tog_view *);
680 	const struct got_error *(*search_next)(struct tog_view *);
681 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
682 	    int **, int **, int **, int **);
683 	int search_started;
684 	int searching;
685 #define TOG_SEARCH_FORWARD	1
686 #define TOG_SEARCH_BACKWARD	2
687 	int search_next_done;
688 #define TOG_SEARCH_HAVE_MORE	1
689 #define TOG_SEARCH_NO_MORE	2
690 #define TOG_SEARCH_HAVE_NONE	3
691 	regex_t regex;
692 	regmatch_t regmatch;
693 };
694 
695 static const struct got_error *open_diff_view(struct tog_view *,
696     struct got_object_id *, struct got_object_id *,
697     const char *, const char *, int, int, int, struct tog_view *,
698     struct got_repository *);
699 static const struct got_error *show_diff_view(struct tog_view *);
700 static const struct got_error *input_diff_view(struct tog_view **,
701     struct tog_view *, int);
702 static const struct got_error *reset_diff_view(struct tog_view *);
703 static const struct got_error* close_diff_view(struct tog_view *);
704 static const struct got_error *search_start_diff_view(struct tog_view *);
705 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
706     size_t *, int **, int **, int **, int **);
707 static const struct got_error *search_next_view_match(struct tog_view *);
708 
709 static const struct got_error *open_log_view(struct tog_view *,
710     struct got_object_id *, struct got_repository *,
711     const char *, const char *, int);
712 static const struct got_error * show_log_view(struct tog_view *);
713 static const struct got_error *input_log_view(struct tog_view **,
714     struct tog_view *, int);
715 static const struct got_error *resize_log_view(struct tog_view *, int);
716 static const struct got_error *close_log_view(struct tog_view *);
717 static const struct got_error *search_start_log_view(struct tog_view *);
718 static const struct got_error *search_next_log_view(struct tog_view *);
719 
720 static const struct got_error *open_blame_view(struct tog_view *, char *,
721     struct got_object_id *, struct got_repository *);
722 static const struct got_error *show_blame_view(struct tog_view *);
723 static const struct got_error *input_blame_view(struct tog_view **,
724     struct tog_view *, int);
725 static const struct got_error *reset_blame_view(struct tog_view *);
726 static const struct got_error *close_blame_view(struct tog_view *);
727 static const struct got_error *search_start_blame_view(struct tog_view *);
728 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
729     size_t *, int **, int **, int **, int **);
730 
731 static const struct got_error *open_tree_view(struct tog_view *,
732     struct got_object_id *, const char *, struct got_repository *);
733 static const struct got_error *show_tree_view(struct tog_view *);
734 static const struct got_error *input_tree_view(struct tog_view **,
735     struct tog_view *, int);
736 static const struct got_error *close_tree_view(struct tog_view *);
737 static const struct got_error *search_start_tree_view(struct tog_view *);
738 static const struct got_error *search_next_tree_view(struct tog_view *);
739 
740 static const struct got_error *open_ref_view(struct tog_view *,
741     struct got_repository *);
742 static const struct got_error *show_ref_view(struct tog_view *);
743 static const struct got_error *input_ref_view(struct tog_view **,
744     struct tog_view *, int);
745 static const struct got_error *close_ref_view(struct tog_view *);
746 static const struct got_error *search_start_ref_view(struct tog_view *);
747 static const struct got_error *search_next_ref_view(struct tog_view *);
748 
749 static const struct got_error *open_help_view(struct tog_view *,
750     struct tog_view *);
751 static const struct got_error *show_help_view(struct tog_view *);
752 static const struct got_error *input_help_view(struct tog_view **,
753     struct tog_view *, int);
754 static const struct got_error *reset_help_view(struct tog_view *);
755 static const struct got_error* close_help_view(struct tog_view *);
756 static const struct got_error *search_start_help_view(struct tog_view *);
757 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
758     size_t *, int **, int **, int **, int **);
759 
760 static volatile sig_atomic_t tog_sigwinch_received;
761 static volatile sig_atomic_t tog_sigpipe_received;
762 static volatile sig_atomic_t tog_sigcont_received;
763 static volatile sig_atomic_t tog_sigint_received;
764 static volatile sig_atomic_t tog_sigterm_received;
765 
766 static void
767 tog_sigwinch(int signo)
768 {
769 	tog_sigwinch_received = 1;
770 }
771 
772 static void
773 tog_sigpipe(int signo)
774 {
775 	tog_sigpipe_received = 1;
776 }
777 
778 static void
779 tog_sigcont(int signo)
780 {
781 	tog_sigcont_received = 1;
782 }
783 
784 static void
785 tog_sigint(int signo)
786 {
787 	tog_sigint_received = 1;
788 }
789 
790 static void
791 tog_sigterm(int signo)
792 {
793 	tog_sigterm_received = 1;
794 }
795 
796 static int
797 tog_fatal_signal_received(void)
798 {
799 	return (tog_sigpipe_received ||
800 	    tog_sigint_received || tog_sigterm_received);
801 }
802 
803 static const struct got_error *
804 view_close(struct tog_view *view)
805 {
806 	const struct got_error *err = NULL, *child_err = NULL;
807 
808 	if (view->child) {
809 		child_err = view_close(view->child);
810 		view->child = NULL;
811 	}
812 	if (view->close)
813 		err = view->close(view);
814 	if (view->panel)
815 		del_panel(view->panel);
816 	if (view->window)
817 		delwin(view->window);
818 	free(view);
819 	return err ? err : child_err;
820 }
821 
822 static struct tog_view *
823 view_open(int nlines, int ncols, int begin_y, int begin_x,
824     enum tog_view_type type)
825 {
826 	struct tog_view *view = calloc(1, sizeof(*view));
827 
828 	if (view == NULL)
829 		return NULL;
830 
831 	view->type = type;
832 	view->lines = LINES;
833 	view->cols = COLS;
834 	view->nlines = nlines ? nlines : LINES - begin_y;
835 	view->ncols = ncols ? ncols : COLS - begin_x;
836 	view->begin_y = begin_y;
837 	view->begin_x = begin_x;
838 	view->window = newwin(nlines, ncols, begin_y, begin_x);
839 	if (view->window == NULL) {
840 		view_close(view);
841 		return NULL;
842 	}
843 	view->panel = new_panel(view->window);
844 	if (view->panel == NULL ||
845 	    set_panel_userptr(view->panel, view) != OK) {
846 		view_close(view);
847 		return NULL;
848 	}
849 
850 	keypad(view->window, TRUE);
851 	return view;
852 }
853 
854 static int
855 view_split_begin_x(int begin_x)
856 {
857 	if (begin_x > 0 || COLS < 120)
858 		return 0;
859 	return (COLS - MAX(COLS / 2, 80));
860 }
861 
862 /* XXX Stub till we decide what to do. */
863 static int
864 view_split_begin_y(int lines)
865 {
866 	return lines * HSPLIT_SCALE;
867 }
868 
869 static const struct got_error *view_resize(struct tog_view *);
870 
871 static const struct got_error *
872 view_splitscreen(struct tog_view *view)
873 {
874 	const struct got_error *err = NULL;
875 
876 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
877 		if (view->resized_y && view->resized_y < view->lines)
878 			view->begin_y = view->resized_y;
879 		else
880 			view->begin_y = view_split_begin_y(view->nlines);
881 		view->begin_x = 0;
882 	} else if (!view->resized) {
883 		if (view->resized_x && view->resized_x < view->cols - 1 &&
884 		    view->cols > 119)
885 			view->begin_x = view->resized_x;
886 		else
887 			view->begin_x = view_split_begin_x(0);
888 		view->begin_y = 0;
889 	}
890 	view->nlines = LINES - view->begin_y;
891 	view->ncols = COLS - view->begin_x;
892 	view->lines = LINES;
893 	view->cols = COLS;
894 	err = view_resize(view);
895 	if (err)
896 		return err;
897 
898 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
899 		view->parent->nlines = view->begin_y;
900 
901 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
902 		return got_error_from_errno("mvwin");
903 
904 	return NULL;
905 }
906 
907 static const struct got_error *
908 view_fullscreen(struct tog_view *view)
909 {
910 	const struct got_error *err = NULL;
911 
912 	view->begin_x = 0;
913 	view->begin_y = view->resized ? view->begin_y : 0;
914 	view->nlines = view->resized ? view->nlines : LINES;
915 	view->ncols = COLS;
916 	view->lines = LINES;
917 	view->cols = COLS;
918 	err = view_resize(view);
919 	if (err)
920 		return err;
921 
922 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
923 		return got_error_from_errno("mvwin");
924 
925 	return NULL;
926 }
927 
928 static int
929 view_is_parent_view(struct tog_view *view)
930 {
931 	return view->parent == NULL;
932 }
933 
934 static int
935 view_is_splitscreen(struct tog_view *view)
936 {
937 	return view->begin_x > 0 || view->begin_y > 0;
938 }
939 
940 static int
941 view_is_fullscreen(struct tog_view *view)
942 {
943 	return view->nlines == LINES && view->ncols == COLS;
944 }
945 
946 static int
947 view_is_hsplit_top(struct tog_view *view)
948 {
949 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
950 	    view_is_splitscreen(view->child);
951 }
952 
953 static void
954 view_border(struct tog_view *view)
955 {
956 	PANEL *panel;
957 	const struct tog_view *view_above;
958 
959 	if (view->parent)
960 		return view_border(view->parent);
961 
962 	panel = panel_above(view->panel);
963 	if (panel == NULL)
964 		return;
965 
966 	view_above = panel_userptr(panel);
967 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
968 		mvwhline(view->window, view_above->begin_y - 1,
969 		    view->begin_x, got_locale_is_utf8() ?
970 		    ACS_HLINE : '-', view->ncols);
971 	else
972 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
973 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
974 }
975 
976 static const struct got_error *view_init_hsplit(struct tog_view *, int);
977 static const struct got_error *request_log_commits(struct tog_view *);
978 static const struct got_error *offset_selection_down(struct tog_view *);
979 static void offset_selection_up(struct tog_view *);
980 static void view_get_split(struct tog_view *, int *, int *);
981 
982 static const struct got_error *
983 view_resize(struct tog_view *view)
984 {
985 	const struct got_error	*err = NULL;
986 	int			 dif, nlines, ncols;
987 
988 	dif = LINES - view->lines;  /* line difference */
989 
990 	if (view->lines > LINES)
991 		nlines = view->nlines - (view->lines - LINES);
992 	else
993 		nlines = view->nlines + (LINES - view->lines);
994 	if (view->cols > COLS)
995 		ncols = view->ncols - (view->cols - COLS);
996 	else
997 		ncols = view->ncols + (COLS - view->cols);
998 
999 	if (view->child) {
1000 		int hs = view->child->begin_y;
1001 
1002 		if (!view_is_fullscreen(view))
1003 			view->child->begin_x = view_split_begin_x(view->begin_x);
1004 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1005 		    view->child->begin_x == 0) {
1006 			ncols = COLS;
1007 
1008 			view_fullscreen(view->child);
1009 			if (view->child->focussed)
1010 				show_panel(view->child->panel);
1011 			else
1012 				show_panel(view->panel);
1013 		} else {
1014 			ncols = view->child->begin_x;
1015 
1016 			view_splitscreen(view->child);
1017 			show_panel(view->child->panel);
1018 		}
1019 		/*
1020 		 * XXX This is ugly and needs to be moved into the above
1021 		 * logic but "works" for now and my attempts at moving it
1022 		 * break either 'tab' or 'F' key maps in horizontal splits.
1023 		 */
1024 		if (hs) {
1025 			err = view_splitscreen(view->child);
1026 			if (err)
1027 				return err;
1028 			if (dif < 0) { /* top split decreased */
1029 				err = offset_selection_down(view);
1030 				if (err)
1031 					return err;
1032 			}
1033 			view_border(view);
1034 			update_panels();
1035 			doupdate();
1036 			show_panel(view->child->panel);
1037 			nlines = view->nlines;
1038 		}
1039 	} else if (view->parent == NULL)
1040 		ncols = COLS;
1041 
1042 	if (view->resize && dif > 0) {
1043 		err = view->resize(view, dif);
1044 		if (err)
1045 			return err;
1046 	}
1047 
1048 	if (wresize(view->window, nlines, ncols) == ERR)
1049 		return got_error_from_errno("wresize");
1050 	if (replace_panel(view->panel, view->window) == ERR)
1051 		return got_error_from_errno("replace_panel");
1052 	wclear(view->window);
1053 
1054 	view->nlines = nlines;
1055 	view->ncols = ncols;
1056 	view->lines = LINES;
1057 	view->cols = COLS;
1058 
1059 	return NULL;
1060 }
1061 
1062 static const struct got_error *
1063 resize_log_view(struct tog_view *view, int increase)
1064 {
1065 	struct tog_log_view_state	*s = &view->state.log;
1066 	const struct got_error		*err = NULL;
1067 	int				 n = 0;
1068 
1069 	if (s->selected_entry)
1070 		n = s->selected_entry->idx + view->lines - s->selected;
1071 
1072 	/*
1073 	 * Request commits to account for the increased
1074 	 * height so we have enough to populate the view.
1075 	 */
1076 	if (s->commits->ncommits < n) {
1077 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1078 		err = request_log_commits(view);
1079 	}
1080 
1081 	return err;
1082 }
1083 
1084 static void
1085 view_adjust_offset(struct tog_view *view, int n)
1086 {
1087 	if (n == 0)
1088 		return;
1089 
1090 	if (view->parent && view->parent->offset) {
1091 		if (view->parent->offset + n >= 0)
1092 			view->parent->offset += n;
1093 		else
1094 			view->parent->offset = 0;
1095 	} else if (view->offset) {
1096 		if (view->offset - n >= 0)
1097 			view->offset -= n;
1098 		else
1099 			view->offset = 0;
1100 	}
1101 }
1102 
1103 static const struct got_error *
1104 view_resize_split(struct tog_view *view, int resize)
1105 {
1106 	const struct got_error	*err = NULL;
1107 	struct tog_view		*v = NULL;
1108 
1109 	if (view->parent)
1110 		v = view->parent;
1111 	else
1112 		v = view;
1113 
1114 	if (!v->child || !view_is_splitscreen(v->child))
1115 		return NULL;
1116 
1117 	v->resized = v->child->resized = resize;  /* lock for resize event */
1118 
1119 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1120 		if (v->child->resized_y)
1121 			v->child->begin_y = v->child->resized_y;
1122 		if (view->parent)
1123 			v->child->begin_y -= resize;
1124 		else
1125 			v->child->begin_y += resize;
1126 		if (v->child->begin_y < 3) {
1127 			view->count = 0;
1128 			v->child->begin_y = 3;
1129 		} else if (v->child->begin_y > LINES - 1) {
1130 			view->count = 0;
1131 			v->child->begin_y = LINES - 1;
1132 		}
1133 		v->ncols = COLS;
1134 		v->child->ncols = COLS;
1135 		view_adjust_offset(view, resize);
1136 		err = view_init_hsplit(v, v->child->begin_y);
1137 		if (err)
1138 			return err;
1139 		v->child->resized_y = v->child->begin_y;
1140 	} else {
1141 		if (v->child->resized_x)
1142 			v->child->begin_x = v->child->resized_x;
1143 		if (view->parent)
1144 			v->child->begin_x -= resize;
1145 		else
1146 			v->child->begin_x += resize;
1147 		if (v->child->begin_x < 11) {
1148 			view->count = 0;
1149 			v->child->begin_x = 11;
1150 		} else if (v->child->begin_x > COLS - 1) {
1151 			view->count = 0;
1152 			v->child->begin_x = COLS - 1;
1153 		}
1154 		v->child->resized_x = v->child->begin_x;
1155 	}
1156 
1157 	v->child->mode = v->mode;
1158 	v->child->nlines = v->lines - v->child->begin_y;
1159 	v->child->ncols = v->cols - v->child->begin_x;
1160 	v->focus_child = 1;
1161 
1162 	err = view_fullscreen(v);
1163 	if (err)
1164 		return err;
1165 	err = view_splitscreen(v->child);
1166 	if (err)
1167 		return err;
1168 
1169 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1170 		err = offset_selection_down(v->child);
1171 		if (err)
1172 			return err;
1173 	}
1174 
1175 	if (v->resize)
1176 		err = v->resize(v, 0);
1177 	else if (v->child->resize)
1178 		err = v->child->resize(v->child, 0);
1179 
1180 	v->resized = v->child->resized = 0;
1181 
1182 	return err;
1183 }
1184 
1185 static void
1186 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1187 {
1188 	struct tog_view *v = src->child ? src->child : src;
1189 
1190 	dst->resized_x = v->resized_x;
1191 	dst->resized_y = v->resized_y;
1192 }
1193 
1194 static const struct got_error *
1195 view_close_child(struct tog_view *view)
1196 {
1197 	const struct got_error *err = NULL;
1198 
1199 	if (view->child == NULL)
1200 		return NULL;
1201 
1202 	err = view_close(view->child);
1203 	view->child = NULL;
1204 	return err;
1205 }
1206 
1207 static const struct got_error *
1208 view_set_child(struct tog_view *view, struct tog_view *child)
1209 {
1210 	const struct got_error *err = NULL;
1211 
1212 	view->child = child;
1213 	child->parent = view;
1214 
1215 	err = view_resize(view);
1216 	if (err)
1217 		return err;
1218 
1219 	if (view->child->resized_x || view->child->resized_y)
1220 		err = view_resize_split(view, 0);
1221 
1222 	return err;
1223 }
1224 
1225 static const struct got_error *view_dispatch_request(struct tog_view **,
1226     struct tog_view *, enum tog_view_type, int, int);
1227 
1228 static const struct got_error *
1229 view_request_new(struct tog_view **requested, struct tog_view *view,
1230     enum tog_view_type request)
1231 {
1232 	struct tog_view		*new_view = NULL;
1233 	const struct got_error	*err;
1234 	int			 y = 0, x = 0;
1235 
1236 	*requested = NULL;
1237 
1238 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1239 		view_get_split(view, &y, &x);
1240 
1241 	err = view_dispatch_request(&new_view, view, request, y, x);
1242 	if (err)
1243 		return err;
1244 
1245 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1246 	    request != TOG_VIEW_HELP) {
1247 		err = view_init_hsplit(view, y);
1248 		if (err)
1249 			return err;
1250 	}
1251 
1252 	view->focussed = 0;
1253 	new_view->focussed = 1;
1254 	new_view->mode = view->mode;
1255 	new_view->nlines = request == TOG_VIEW_HELP ?
1256 	    view->lines : view->lines - y;
1257 
1258 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1259 		view_transfer_size(new_view, view);
1260 		err = view_close_child(view);
1261 		if (err)
1262 			return err;
1263 		err = view_set_child(view, new_view);
1264 		if (err)
1265 			return err;
1266 		view->focus_child = 1;
1267 	} else
1268 		*requested = new_view;
1269 
1270 	return NULL;
1271 }
1272 
1273 static void
1274 tog_resizeterm(void)
1275 {
1276 	int cols, lines;
1277 	struct winsize size;
1278 
1279 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1280 		cols = 80;     /* Default */
1281 		lines = 24;
1282 	} else {
1283 		cols = size.ws_col;
1284 		lines = size.ws_row;
1285 	}
1286 	resize_term(lines, cols);
1287 }
1288 
1289 static const struct got_error *
1290 view_search_start(struct tog_view *view)
1291 {
1292 	const struct got_error *err = NULL;
1293 	struct tog_view *v = view;
1294 	char pattern[1024];
1295 	int ret;
1296 
1297 	if (view->search_started) {
1298 		regfree(&view->regex);
1299 		view->searching = 0;
1300 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1301 	}
1302 	view->search_started = 0;
1303 
1304 	if (view->nlines < 1)
1305 		return NULL;
1306 
1307 	if (view_is_hsplit_top(view))
1308 		v = view->child;
1309 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1310 		v = view->parent;
1311 
1312 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1313 	wclrtoeol(v->window);
1314 
1315 	nodelay(v->window, FALSE);  /* block for search term input */
1316 	nocbreak();
1317 	echo();
1318 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1319 	wrefresh(v->window);
1320 	cbreak();
1321 	noecho();
1322 	nodelay(v->window, TRUE);
1323 	if (ret == ERR)
1324 		return NULL;
1325 
1326 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1327 		err = view->search_start(view);
1328 		if (err) {
1329 			regfree(&view->regex);
1330 			return err;
1331 		}
1332 		view->search_started = 1;
1333 		view->searching = TOG_SEARCH_FORWARD;
1334 		view->search_next_done = 0;
1335 		view->search_next(view);
1336 	}
1337 
1338 	return NULL;
1339 }
1340 
1341 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1342 static const struct got_error *
1343 switch_split(struct tog_view *view)
1344 {
1345 	const struct got_error	*err = NULL;
1346 	struct tog_view		*v = NULL;
1347 
1348 	if (view->parent)
1349 		v = view->parent;
1350 	else
1351 		v = view;
1352 
1353 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1354 		v->mode = TOG_VIEW_SPLIT_VERT;
1355 	else
1356 		v->mode = TOG_VIEW_SPLIT_HRZN;
1357 
1358 	if (!v->child)
1359 		return NULL;
1360 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1361 		v->mode = TOG_VIEW_SPLIT_NONE;
1362 
1363 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1364 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1365 		v->child->begin_y = v->child->resized_y;
1366 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1367 		v->child->begin_x = v->child->resized_x;
1368 
1369 
1370 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1371 		v->ncols = COLS;
1372 		v->child->ncols = COLS;
1373 		v->child->nscrolled = LINES - v->child->nlines;
1374 
1375 		err = view_init_hsplit(v, v->child->begin_y);
1376 		if (err)
1377 			return err;
1378 	}
1379 	v->child->mode = v->mode;
1380 	v->child->nlines = v->lines - v->child->begin_y;
1381 	v->focus_child = 1;
1382 
1383 	err = view_fullscreen(v);
1384 	if (err)
1385 		return err;
1386 	err = view_splitscreen(v->child);
1387 	if (err)
1388 		return err;
1389 
1390 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1391 		v->mode = TOG_VIEW_SPLIT_VERT;
1392 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1393 		err = offset_selection_down(v);
1394 		if (err)
1395 			return err;
1396 		err = offset_selection_down(v->child);
1397 		if (err)
1398 			return err;
1399 	} else {
1400 		offset_selection_up(v);
1401 		offset_selection_up(v->child);
1402 	}
1403 	if (v->resize)
1404 		err = v->resize(v, 0);
1405 	else if (v->child->resize)
1406 		err = v->child->resize(v->child, 0);
1407 
1408 	return err;
1409 }
1410 
1411 /*
1412  * Compute view->count from numeric input. Assign total to view->count and
1413  * return first non-numeric key entered.
1414  */
1415 static int
1416 get_compound_key(struct tog_view *view, int c)
1417 {
1418 	struct tog_view	*v = view;
1419 	int		 x, n = 0;
1420 
1421 	if (view_is_hsplit_top(view))
1422 		v = view->child;
1423 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1424 		v = view->parent;
1425 
1426 	view->count = 0;
1427 	cbreak();  /* block for input */
1428 	nodelay(view->window, FALSE);
1429 	wmove(v->window, v->nlines - 1, 0);
1430 	wclrtoeol(v->window);
1431 	waddch(v->window, ':');
1432 
1433 	do {
1434 		x = getcurx(v->window);
1435 		if (x != ERR && x < view->ncols) {
1436 			waddch(v->window, c);
1437 			wrefresh(v->window);
1438 		}
1439 
1440 		/*
1441 		 * Don't overflow. Max valid request should be the greatest
1442 		 * between the longest and total lines; cap at 10 million.
1443 		 */
1444 		if (n >= 9999999)
1445 			n = 9999999;
1446 		else
1447 			n = n * 10 + (c - '0');
1448 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1449 
1450 	if (c == 'G' || c == 'g') {	/* nG key map */
1451 		view->gline = view->hiline = n;
1452 		n = 0;
1453 		c = 0;
1454 	}
1455 
1456 	/* Massage excessive or inapplicable values at the input handler. */
1457 	view->count = n;
1458 
1459 	return c;
1460 }
1461 
1462 static const struct got_error *
1463 view_input(struct tog_view **new, int *done, struct tog_view *view,
1464     struct tog_view_list_head *views)
1465 {
1466 	const struct got_error *err = NULL;
1467 	struct tog_view *v;
1468 	int ch, errcode;
1469 
1470 	*new = NULL;
1471 
1472 	/* Clear "no matches" indicator. */
1473 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1474 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1475 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1476 		view->count = 0;
1477 	}
1478 
1479 	if (view->searching && !view->search_next_done) {
1480 		errcode = pthread_mutex_unlock(&tog_mutex);
1481 		if (errcode)
1482 			return got_error_set_errno(errcode,
1483 			    "pthread_mutex_unlock");
1484 		sched_yield();
1485 		errcode = pthread_mutex_lock(&tog_mutex);
1486 		if (errcode)
1487 			return got_error_set_errno(errcode,
1488 			    "pthread_mutex_lock");
1489 		view->search_next(view);
1490 		return NULL;
1491 	}
1492 
1493 	/* Allow threads to make progress while we are waiting for input. */
1494 	errcode = pthread_mutex_unlock(&tog_mutex);
1495 	if (errcode)
1496 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1497 	/* If we have an unfinished count, let C-g or backspace abort. */
1498 	if (view->count && --view->count) {
1499 		cbreak();
1500 		nodelay(view->window, TRUE);
1501 		ch = wgetch(view->window);
1502 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1503 			view->count = 0;
1504 		else
1505 			ch = view->ch;
1506 	} else {
1507 		ch = wgetch(view->window);
1508 		if (ch >= '1' && ch  <= '9')
1509 			view->ch = ch = get_compound_key(view, ch);
1510 	}
1511 	if (view->hiline && ch != ERR && ch != 0)
1512 		view->hiline = 0;  /* key pressed, clear line highlight */
1513 	nodelay(view->window, TRUE);
1514 	errcode = pthread_mutex_lock(&tog_mutex);
1515 	if (errcode)
1516 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1517 
1518 	if (tog_sigwinch_received || tog_sigcont_received) {
1519 		tog_resizeterm();
1520 		tog_sigwinch_received = 0;
1521 		tog_sigcont_received = 0;
1522 		TAILQ_FOREACH(v, views, entry) {
1523 			err = view_resize(v);
1524 			if (err)
1525 				return err;
1526 			err = v->input(new, v, KEY_RESIZE);
1527 			if (err)
1528 				return err;
1529 			if (v->child) {
1530 				err = view_resize(v->child);
1531 				if (err)
1532 					return err;
1533 				err = v->child->input(new, v->child,
1534 				    KEY_RESIZE);
1535 				if (err)
1536 					return err;
1537 				if (v->child->resized_x || v->child->resized_y) {
1538 					err = view_resize_split(v, 0);
1539 					if (err)
1540 						return err;
1541 				}
1542 			}
1543 		}
1544 	}
1545 
1546 	switch (ch) {
1547 	case '?':
1548 	case 'H':
1549 	case KEY_F(1):
1550 		if (view->type == TOG_VIEW_HELP)
1551 			err = view->reset(view);
1552 		else
1553 			err = view_request_new(new, view, TOG_VIEW_HELP);
1554 		break;
1555 	case '\t':
1556 		view->count = 0;
1557 		if (view->child) {
1558 			view->focussed = 0;
1559 			view->child->focussed = 1;
1560 			view->focus_child = 1;
1561 		} else if (view->parent) {
1562 			view->focussed = 0;
1563 			view->parent->focussed = 1;
1564 			view->parent->focus_child = 0;
1565 			if (!view_is_splitscreen(view)) {
1566 				if (view->parent->resize) {
1567 					err = view->parent->resize(view->parent,
1568 					    0);
1569 					if (err)
1570 						return err;
1571 				}
1572 				offset_selection_up(view->parent);
1573 				err = view_fullscreen(view->parent);
1574 				if (err)
1575 					return err;
1576 			}
1577 		}
1578 		break;
1579 	case 'q':
1580 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1581 			if (view->parent->resize) {
1582 				/* might need more commits to fill fullscreen */
1583 				err = view->parent->resize(view->parent, 0);
1584 				if (err)
1585 					break;
1586 			}
1587 			offset_selection_up(view->parent);
1588 		}
1589 		err = view->input(new, view, ch);
1590 		view->dying = 1;
1591 		break;
1592 	case 'Q':
1593 		*done = 1;
1594 		break;
1595 	case 'F':
1596 		view->count = 0;
1597 		if (view_is_parent_view(view)) {
1598 			if (view->child == NULL)
1599 				break;
1600 			if (view_is_splitscreen(view->child)) {
1601 				view->focussed = 0;
1602 				view->child->focussed = 1;
1603 				err = view_fullscreen(view->child);
1604 			} else {
1605 				err = view_splitscreen(view->child);
1606 				if (!err)
1607 					err = view_resize_split(view, 0);
1608 			}
1609 			if (err)
1610 				break;
1611 			err = view->child->input(new, view->child,
1612 			    KEY_RESIZE);
1613 		} else {
1614 			if (view_is_splitscreen(view)) {
1615 				view->parent->focussed = 0;
1616 				view->focussed = 1;
1617 				err = view_fullscreen(view);
1618 			} else {
1619 				err = view_splitscreen(view);
1620 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1621 					err = view_resize(view->parent);
1622 				if (!err)
1623 					err = view_resize_split(view, 0);
1624 			}
1625 			if (err)
1626 				break;
1627 			err = view->input(new, view, KEY_RESIZE);
1628 		}
1629 		if (err)
1630 			break;
1631 		if (view->resize) {
1632 			err = view->resize(view, 0);
1633 			if (err)
1634 				break;
1635 		}
1636 		if (view->parent)
1637 			err = offset_selection_down(view->parent);
1638 		if (!err)
1639 			err = offset_selection_down(view);
1640 		break;
1641 	case 'S':
1642 		view->count = 0;
1643 		err = switch_split(view);
1644 		break;
1645 	case '-':
1646 		err = view_resize_split(view, -1);
1647 		break;
1648 	case '+':
1649 		err = view_resize_split(view, 1);
1650 		break;
1651 	case KEY_RESIZE:
1652 		break;
1653 	case '/':
1654 		view->count = 0;
1655 		if (view->search_start)
1656 			view_search_start(view);
1657 		else
1658 			err = view->input(new, view, ch);
1659 		break;
1660 	case 'N':
1661 	case 'n':
1662 		if (view->search_started && view->search_next) {
1663 			view->searching = (ch == 'n' ?
1664 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1665 			view->search_next_done = 0;
1666 			view->search_next(view);
1667 		} else
1668 			err = view->input(new, view, ch);
1669 		break;
1670 	case 'A':
1671 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1672 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1673 		else
1674 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1675 		TAILQ_FOREACH(v, views, entry) {
1676 			if (v->reset) {
1677 				err = v->reset(v);
1678 				if (err)
1679 					return err;
1680 			}
1681 			if (v->child && v->child->reset) {
1682 				err = v->child->reset(v->child);
1683 				if (err)
1684 					return err;
1685 			}
1686 		}
1687 		break;
1688 	default:
1689 		err = view->input(new, view, ch);
1690 		break;
1691 	}
1692 
1693 	return err;
1694 }
1695 
1696 static int
1697 view_needs_focus_indication(struct tog_view *view)
1698 {
1699 	if (view_is_parent_view(view)) {
1700 		if (view->child == NULL || view->child->focussed)
1701 			return 0;
1702 		if (!view_is_splitscreen(view->child))
1703 			return 0;
1704 	} else if (!view_is_splitscreen(view))
1705 		return 0;
1706 
1707 	return view->focussed;
1708 }
1709 
1710 static const struct got_error *
1711 view_loop(struct tog_view *view)
1712 {
1713 	const struct got_error *err = NULL;
1714 	struct tog_view_list_head views;
1715 	struct tog_view *new_view;
1716 	char *mode;
1717 	int fast_refresh = 10;
1718 	int done = 0, errcode;
1719 
1720 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1721 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1722 		view->mode = TOG_VIEW_SPLIT_VERT;
1723 	else
1724 		view->mode = TOG_VIEW_SPLIT_HRZN;
1725 
1726 	errcode = pthread_mutex_lock(&tog_mutex);
1727 	if (errcode)
1728 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1729 
1730 	TAILQ_INIT(&views);
1731 	TAILQ_INSERT_HEAD(&views, view, entry);
1732 
1733 	view->focussed = 1;
1734 	err = view->show(view);
1735 	if (err)
1736 		return err;
1737 	update_panels();
1738 	doupdate();
1739 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1740 	    !tog_fatal_signal_received()) {
1741 		/* Refresh fast during initialization, then become slower. */
1742 		if (fast_refresh && fast_refresh-- == 0)
1743 			halfdelay(10); /* switch to once per second */
1744 
1745 		err = view_input(&new_view, &done, view, &views);
1746 		if (err)
1747 			break;
1748 		if (view->dying) {
1749 			struct tog_view *v, *prev = NULL;
1750 
1751 			if (view_is_parent_view(view))
1752 				prev = TAILQ_PREV(view, tog_view_list_head,
1753 				    entry);
1754 			else if (view->parent)
1755 				prev = view->parent;
1756 
1757 			if (view->parent) {
1758 				view->parent->child = NULL;
1759 				view->parent->focus_child = 0;
1760 				/* Restore fullscreen line height. */
1761 				view->parent->nlines = view->parent->lines;
1762 				err = view_resize(view->parent);
1763 				if (err)
1764 					break;
1765 				/* Make resized splits persist. */
1766 				view_transfer_size(view->parent, view);
1767 			} else
1768 				TAILQ_REMOVE(&views, view, entry);
1769 
1770 			err = view_close(view);
1771 			if (err)
1772 				goto done;
1773 
1774 			view = NULL;
1775 			TAILQ_FOREACH(v, &views, entry) {
1776 				if (v->focussed)
1777 					break;
1778 			}
1779 			if (view == NULL && new_view == NULL) {
1780 				/* No view has focus. Try to pick one. */
1781 				if (prev)
1782 					view = prev;
1783 				else if (!TAILQ_EMPTY(&views)) {
1784 					view = TAILQ_LAST(&views,
1785 					    tog_view_list_head);
1786 				}
1787 				if (view) {
1788 					if (view->focus_child) {
1789 						view->child->focussed = 1;
1790 						view = view->child;
1791 					} else
1792 						view->focussed = 1;
1793 				}
1794 			}
1795 		}
1796 		if (new_view) {
1797 			struct tog_view *v, *t;
1798 			/* Only allow one parent view per type. */
1799 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1800 				if (v->type != new_view->type)
1801 					continue;
1802 				TAILQ_REMOVE(&views, v, entry);
1803 				err = view_close(v);
1804 				if (err)
1805 					goto done;
1806 				break;
1807 			}
1808 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1809 			view = new_view;
1810 		}
1811 		if (view) {
1812 			if (view_is_parent_view(view)) {
1813 				if (view->child && view->child->focussed)
1814 					view = view->child;
1815 			} else {
1816 				if (view->parent && view->parent->focussed)
1817 					view = view->parent;
1818 			}
1819 			show_panel(view->panel);
1820 			if (view->child && view_is_splitscreen(view->child))
1821 				show_panel(view->child->panel);
1822 			if (view->parent && view_is_splitscreen(view)) {
1823 				err = view->parent->show(view->parent);
1824 				if (err)
1825 					goto done;
1826 			}
1827 			err = view->show(view);
1828 			if (err)
1829 				goto done;
1830 			if (view->child) {
1831 				err = view->child->show(view->child);
1832 				if (err)
1833 					goto done;
1834 			}
1835 			update_panels();
1836 			doupdate();
1837 		}
1838 	}
1839 done:
1840 	while (!TAILQ_EMPTY(&views)) {
1841 		const struct got_error *close_err;
1842 		view = TAILQ_FIRST(&views);
1843 		TAILQ_REMOVE(&views, view, entry);
1844 		close_err = view_close(view);
1845 		if (close_err && err == NULL)
1846 			err = close_err;
1847 	}
1848 
1849 	errcode = pthread_mutex_unlock(&tog_mutex);
1850 	if (errcode && err == NULL)
1851 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1852 
1853 	return err;
1854 }
1855 
1856 __dead static void
1857 usage_log(void)
1858 {
1859 	endwin();
1860 	fprintf(stderr,
1861 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1862 	    getprogname());
1863 	exit(1);
1864 }
1865 
1866 /* Create newly allocated wide-character string equivalent to a byte string. */
1867 static const struct got_error *
1868 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1869 {
1870 	char *vis = NULL;
1871 	const struct got_error *err = NULL;
1872 
1873 	*ws = NULL;
1874 	*wlen = mbstowcs(NULL, s, 0);
1875 	if (*wlen == (size_t)-1) {
1876 		int vislen;
1877 		if (errno != EILSEQ)
1878 			return got_error_from_errno("mbstowcs");
1879 
1880 		/* byte string invalid in current encoding; try to "fix" it */
1881 		err = got_mbsavis(&vis, &vislen, s);
1882 		if (err)
1883 			return err;
1884 		*wlen = mbstowcs(NULL, vis, 0);
1885 		if (*wlen == (size_t)-1) {
1886 			err = got_error_from_errno("mbstowcs"); /* give up */
1887 			goto done;
1888 		}
1889 	}
1890 
1891 	*ws = calloc(*wlen + 1, sizeof(**ws));
1892 	if (*ws == NULL) {
1893 		err = got_error_from_errno("calloc");
1894 		goto done;
1895 	}
1896 
1897 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1898 		err = got_error_from_errno("mbstowcs");
1899 done:
1900 	free(vis);
1901 	if (err) {
1902 		free(*ws);
1903 		*ws = NULL;
1904 		*wlen = 0;
1905 	}
1906 	return err;
1907 }
1908 
1909 static const struct got_error *
1910 expand_tab(char **ptr, const char *src)
1911 {
1912 	char	*dst;
1913 	size_t	 len, n, idx = 0, sz = 0;
1914 
1915 	*ptr = NULL;
1916 	n = len = strlen(src);
1917 	dst = malloc(n + 1);
1918 	if (dst == NULL)
1919 		return got_error_from_errno("malloc");
1920 
1921 	while (idx < len && src[idx]) {
1922 		const char c = src[idx];
1923 
1924 		if (c == '\t') {
1925 			size_t nb = TABSIZE - sz % TABSIZE;
1926 			char *p;
1927 
1928 			p = realloc(dst, n + nb);
1929 			if (p == NULL) {
1930 				free(dst);
1931 				return got_error_from_errno("realloc");
1932 
1933 			}
1934 			dst = p;
1935 			n += nb;
1936 			memset(dst + sz, ' ', nb);
1937 			sz += nb;
1938 		} else
1939 			dst[sz++] = src[idx];
1940 		++idx;
1941 	}
1942 
1943 	dst[sz] = '\0';
1944 	*ptr = dst;
1945 	return NULL;
1946 }
1947 
1948 /*
1949  * Advance at most n columns from wline starting at offset off.
1950  * Return the index to the first character after the span operation.
1951  * Return the combined column width of all spanned wide character in
1952  * *rcol.
1953  */
1954 static int
1955 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1956 {
1957 	int width, i, cols = 0;
1958 
1959 	if (n == 0) {
1960 		*rcol = cols;
1961 		return off;
1962 	}
1963 
1964 	for (i = off; wline[i] != L'\0'; ++i) {
1965 		if (wline[i] == L'\t')
1966 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1967 		else
1968 			width = wcwidth(wline[i]);
1969 
1970 		if (width == -1) {
1971 			width = 1;
1972 			wline[i] = L'.';
1973 		}
1974 
1975 		if (cols + width > n)
1976 			break;
1977 		cols += width;
1978 	}
1979 
1980 	*rcol = cols;
1981 	return i;
1982 }
1983 
1984 /*
1985  * Format a line for display, ensuring that it won't overflow a width limit.
1986  * With scrolling, the width returned refers to the scrolled version of the
1987  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1988  */
1989 static const struct got_error *
1990 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1991     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1992 {
1993 	const struct got_error *err = NULL;
1994 	int cols;
1995 	wchar_t *wline = NULL;
1996 	char *exstr = NULL;
1997 	size_t wlen;
1998 	int i, scrollx;
1999 
2000 	*wlinep = NULL;
2001 	*widthp = 0;
2002 
2003 	if (expand) {
2004 		err = expand_tab(&exstr, line);
2005 		if (err)
2006 			return err;
2007 	}
2008 
2009 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2010 	free(exstr);
2011 	if (err)
2012 		return err;
2013 
2014 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2015 
2016 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2017 		wline[wlen - 1] = L'\0';
2018 		wlen--;
2019 	}
2020 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2021 		wline[wlen - 1] = L'\0';
2022 		wlen--;
2023 	}
2024 
2025 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2026 	wline[i] = L'\0';
2027 
2028 	if (widthp)
2029 		*widthp = cols;
2030 	if (scrollxp)
2031 		*scrollxp = scrollx;
2032 	if (err)
2033 		free(wline);
2034 	else
2035 		*wlinep = wline;
2036 	return err;
2037 }
2038 
2039 static const struct got_error*
2040 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2041     struct got_object_id *id, struct got_repository *repo)
2042 {
2043 	static const struct got_error *err = NULL;
2044 	struct got_reflist_entry *re;
2045 	char *s;
2046 	const char *name;
2047 
2048 	*refs_str = NULL;
2049 
2050 	TAILQ_FOREACH(re, refs, entry) {
2051 		struct got_tag_object *tag = NULL;
2052 		struct got_object_id *ref_id;
2053 		int cmp;
2054 
2055 		name = got_ref_get_name(re->ref);
2056 		if (strcmp(name, GOT_REF_HEAD) == 0)
2057 			continue;
2058 		if (strncmp(name, "refs/", 5) == 0)
2059 			name += 5;
2060 		if (strncmp(name, "got/", 4) == 0 &&
2061 		    strncmp(name, "got/backup/", 11) != 0)
2062 			continue;
2063 		if (strncmp(name, "heads/", 6) == 0)
2064 			name += 6;
2065 		if (strncmp(name, "remotes/", 8) == 0) {
2066 			name += 8;
2067 			s = strstr(name, "/" GOT_REF_HEAD);
2068 			if (s != NULL && s[strlen(s)] == '\0')
2069 				continue;
2070 		}
2071 		err = got_ref_resolve(&ref_id, repo, re->ref);
2072 		if (err)
2073 			break;
2074 		if (strncmp(name, "tags/", 5) == 0) {
2075 			err = got_object_open_as_tag(&tag, repo, ref_id);
2076 			if (err) {
2077 				if (err->code != GOT_ERR_OBJ_TYPE) {
2078 					free(ref_id);
2079 					break;
2080 				}
2081 				/* Ref points at something other than a tag. */
2082 				err = NULL;
2083 				tag = NULL;
2084 			}
2085 		}
2086 		cmp = got_object_id_cmp(tag ?
2087 		    got_object_tag_get_object_id(tag) : ref_id, id);
2088 		free(ref_id);
2089 		if (tag)
2090 			got_object_tag_close(tag);
2091 		if (cmp != 0)
2092 			continue;
2093 		s = *refs_str;
2094 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2095 		    s ? ", " : "", name) == -1) {
2096 			err = got_error_from_errno("asprintf");
2097 			free(s);
2098 			*refs_str = NULL;
2099 			break;
2100 		}
2101 		free(s);
2102 	}
2103 
2104 	return err;
2105 }
2106 
2107 static const struct got_error *
2108 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2109     int col_tab_align)
2110 {
2111 	char *smallerthan;
2112 
2113 	smallerthan = strchr(author, '<');
2114 	if (smallerthan && smallerthan[1] != '\0')
2115 		author = smallerthan + 1;
2116 	author[strcspn(author, "@>")] = '\0';
2117 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2118 	    col_tab_align, 0);
2119 }
2120 
2121 static const struct got_error *
2122 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2123     struct got_object_id *id, const size_t date_display_cols,
2124     int author_display_cols)
2125 {
2126 	struct tog_log_view_state *s = &view->state.log;
2127 	const struct got_error *err = NULL;
2128 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2129 	char *logmsg0 = NULL, *logmsg = NULL;
2130 	char *author = NULL;
2131 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2132 	int author_width, logmsg_width;
2133 	char *newline, *line = NULL;
2134 	int col, limit, scrollx;
2135 	const int avail = view->ncols;
2136 	struct tm tm;
2137 	time_t committer_time;
2138 	struct tog_color *tc;
2139 
2140 	committer_time = got_object_commit_get_committer_time(commit);
2141 	if (gmtime_r(&committer_time, &tm) == NULL)
2142 		return got_error_from_errno("gmtime_r");
2143 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2144 		return got_error(GOT_ERR_NO_SPACE);
2145 
2146 	if (avail <= date_display_cols)
2147 		limit = MIN(sizeof(datebuf) - 1, avail);
2148 	else
2149 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2150 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2151 	if (tc)
2152 		wattr_on(view->window,
2153 		    COLOR_PAIR(tc->colorpair), NULL);
2154 	waddnstr(view->window, datebuf, limit);
2155 	if (tc)
2156 		wattr_off(view->window,
2157 		    COLOR_PAIR(tc->colorpair), NULL);
2158 	col = limit;
2159 	if (col > avail)
2160 		goto done;
2161 
2162 	if (avail >= 120) {
2163 		char *id_str;
2164 		err = got_object_id_str(&id_str, id);
2165 		if (err)
2166 			goto done;
2167 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2168 		if (tc)
2169 			wattr_on(view->window,
2170 			    COLOR_PAIR(tc->colorpair), NULL);
2171 		wprintw(view->window, "%.8s ", id_str);
2172 		if (tc)
2173 			wattr_off(view->window,
2174 			    COLOR_PAIR(tc->colorpair), NULL);
2175 		free(id_str);
2176 		col += 9;
2177 		if (col > avail)
2178 			goto done;
2179 	}
2180 
2181 	if (s->use_committer)
2182 		author = strdup(got_object_commit_get_committer(commit));
2183 	else
2184 		author = strdup(got_object_commit_get_author(commit));
2185 	if (author == NULL) {
2186 		err = got_error_from_errno("strdup");
2187 		goto done;
2188 	}
2189 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2190 	if (err)
2191 		goto done;
2192 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2193 	if (tc)
2194 		wattr_on(view->window,
2195 		    COLOR_PAIR(tc->colorpair), NULL);
2196 	waddwstr(view->window, wauthor);
2197 	col += author_width;
2198 	while (col < avail && author_width < author_display_cols + 2) {
2199 		waddch(view->window, ' ');
2200 		col++;
2201 		author_width++;
2202 	}
2203 	if (tc)
2204 		wattr_off(view->window,
2205 		    COLOR_PAIR(tc->colorpair), NULL);
2206 	if (col > avail)
2207 		goto done;
2208 
2209 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2210 	if (err)
2211 		goto done;
2212 	logmsg = logmsg0;
2213 	while (*logmsg == '\n')
2214 		logmsg++;
2215 	newline = strchr(logmsg, '\n');
2216 	if (newline)
2217 		*newline = '\0';
2218 	limit = avail - col;
2219 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2220 		limit--;	/* for the border */
2221 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2222 	    limit, col, 1);
2223 	if (err)
2224 		goto done;
2225 	waddwstr(view->window, &wlogmsg[scrollx]);
2226 	col += MAX(logmsg_width, 0);
2227 	while (col < avail) {
2228 		waddch(view->window, ' ');
2229 		col++;
2230 	}
2231 done:
2232 	free(logmsg0);
2233 	free(wlogmsg);
2234 	free(author);
2235 	free(wauthor);
2236 	free(line);
2237 	return err;
2238 }
2239 
2240 static struct commit_queue_entry *
2241 alloc_commit_queue_entry(struct got_commit_object *commit,
2242     struct got_object_id *id)
2243 {
2244 	struct commit_queue_entry *entry;
2245 	struct got_object_id *dup;
2246 
2247 	entry = calloc(1, sizeof(*entry));
2248 	if (entry == NULL)
2249 		return NULL;
2250 
2251 	dup = got_object_id_dup(id);
2252 	if (dup == NULL) {
2253 		free(entry);
2254 		return NULL;
2255 	}
2256 
2257 	entry->id = dup;
2258 	entry->commit = commit;
2259 	return entry;
2260 }
2261 
2262 static void
2263 pop_commit(struct commit_queue *commits)
2264 {
2265 	struct commit_queue_entry *entry;
2266 
2267 	entry = TAILQ_FIRST(&commits->head);
2268 	TAILQ_REMOVE(&commits->head, entry, entry);
2269 	got_object_commit_close(entry->commit);
2270 	commits->ncommits--;
2271 	free(entry->id);
2272 	free(entry);
2273 }
2274 
2275 static void
2276 free_commits(struct commit_queue *commits)
2277 {
2278 	while (!TAILQ_EMPTY(&commits->head))
2279 		pop_commit(commits);
2280 }
2281 
2282 static const struct got_error *
2283 match_commit(int *have_match, struct got_object_id *id,
2284     struct got_commit_object *commit, regex_t *regex)
2285 {
2286 	const struct got_error *err = NULL;
2287 	regmatch_t regmatch;
2288 	char *id_str = NULL, *logmsg = NULL;
2289 
2290 	*have_match = 0;
2291 
2292 	err = got_object_id_str(&id_str, id);
2293 	if (err)
2294 		return err;
2295 
2296 	err = got_object_commit_get_logmsg(&logmsg, commit);
2297 	if (err)
2298 		goto done;
2299 
2300 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2301 	    &regmatch, 0) == 0 ||
2302 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2303 	    &regmatch, 0) == 0 ||
2304 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2305 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2306 		*have_match = 1;
2307 done:
2308 	free(id_str);
2309 	free(logmsg);
2310 	return err;
2311 }
2312 
2313 static const struct got_error *
2314 queue_commits(struct tog_log_thread_args *a)
2315 {
2316 	const struct got_error *err = NULL;
2317 
2318 	/*
2319 	 * We keep all commits open throughout the lifetime of the log
2320 	 * view in order to avoid having to re-fetch commits from disk
2321 	 * while updating the display.
2322 	 */
2323 	do {
2324 		struct got_object_id id;
2325 		struct got_commit_object *commit;
2326 		struct commit_queue_entry *entry;
2327 		int limit_match = 0;
2328 		int errcode;
2329 
2330 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2331 		    NULL, NULL);
2332 		if (err)
2333 			break;
2334 
2335 		err = got_object_open_as_commit(&commit, a->repo, &id);
2336 		if (err)
2337 			break;
2338 		entry = alloc_commit_queue_entry(commit, &id);
2339 		if (entry == NULL) {
2340 			err = got_error_from_errno("alloc_commit_queue_entry");
2341 			break;
2342 		}
2343 
2344 		errcode = pthread_mutex_lock(&tog_mutex);
2345 		if (errcode) {
2346 			err = got_error_set_errno(errcode,
2347 			    "pthread_mutex_lock");
2348 			break;
2349 		}
2350 
2351 		entry->idx = a->real_commits->ncommits;
2352 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2353 		a->real_commits->ncommits++;
2354 
2355 		if (*a->limiting) {
2356 			err = match_commit(&limit_match, &id, commit,
2357 			    a->limit_regex);
2358 			if (err)
2359 				break;
2360 
2361 			if (limit_match) {
2362 				struct commit_queue_entry *matched;
2363 
2364 				matched = alloc_commit_queue_entry(
2365 				    entry->commit, entry->id);
2366 				if (matched == NULL) {
2367 					err = got_error_from_errno(
2368 					    "alloc_commit_queue_entry");
2369 					break;
2370 				}
2371 				matched->commit = entry->commit;
2372 				got_object_commit_retain(entry->commit);
2373 
2374 				matched->idx = a->limit_commits->ncommits;
2375 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2376 				    matched, entry);
2377 				a->limit_commits->ncommits++;
2378 			}
2379 
2380 			/*
2381 			 * This is how we signal log_thread() that we
2382 			 * have found a match, and that it should be
2383 			 * counted as a new entry for the view.
2384 			 */
2385 			a->limit_match = limit_match;
2386 		}
2387 
2388 		if (*a->searching == TOG_SEARCH_FORWARD &&
2389 		    !*a->search_next_done) {
2390 			int have_match;
2391 			err = match_commit(&have_match, &id, commit, a->regex);
2392 			if (err)
2393 				break;
2394 
2395 			if (*a->limiting) {
2396 				if (limit_match && have_match)
2397 					*a->search_next_done =
2398 					    TOG_SEARCH_HAVE_MORE;
2399 			} else if (have_match)
2400 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2401 		}
2402 
2403 		errcode = pthread_mutex_unlock(&tog_mutex);
2404 		if (errcode && err == NULL)
2405 			err = got_error_set_errno(errcode,
2406 			    "pthread_mutex_unlock");
2407 		if (err)
2408 			break;
2409 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2410 
2411 	return err;
2412 }
2413 
2414 static void
2415 select_commit(struct tog_log_view_state *s)
2416 {
2417 	struct commit_queue_entry *entry;
2418 	int ncommits = 0;
2419 
2420 	entry = s->first_displayed_entry;
2421 	while (entry) {
2422 		if (ncommits == s->selected) {
2423 			s->selected_entry = entry;
2424 			break;
2425 		}
2426 		entry = TAILQ_NEXT(entry, entry);
2427 		ncommits++;
2428 	}
2429 }
2430 
2431 static const struct got_error *
2432 draw_commits(struct tog_view *view)
2433 {
2434 	const struct got_error *err = NULL;
2435 	struct tog_log_view_state *s = &view->state.log;
2436 	struct commit_queue_entry *entry = s->selected_entry;
2437 	int limit = view->nlines;
2438 	int width;
2439 	int ncommits, author_cols = 4;
2440 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2441 	char *refs_str = NULL;
2442 	wchar_t *wline;
2443 	struct tog_color *tc;
2444 	static const size_t date_display_cols = 12;
2445 
2446 	if (view_is_hsplit_top(view))
2447 		--limit;  /* account for border */
2448 
2449 	if (s->selected_entry &&
2450 	    !(view->searching && view->search_next_done == 0)) {
2451 		struct got_reflist_head *refs;
2452 		err = got_object_id_str(&id_str, s->selected_entry->id);
2453 		if (err)
2454 			return err;
2455 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2456 		    s->selected_entry->id);
2457 		if (refs) {
2458 			err = build_refs_str(&refs_str, refs,
2459 			    s->selected_entry->id, s->repo);
2460 			if (err)
2461 				goto done;
2462 		}
2463 	}
2464 
2465 	if (s->thread_args.commits_needed == 0)
2466 		halfdelay(10); /* disable fast refresh */
2467 
2468 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2469 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2470 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2471 		    (view->searching && !view->search_next_done) ?
2472 		    "searching..." : "loading...") == -1) {
2473 			err = got_error_from_errno("asprintf");
2474 			goto done;
2475 		}
2476 	} else {
2477 		const char *search_str = NULL;
2478 		const char *limit_str = NULL;
2479 
2480 		if (view->searching) {
2481 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2482 				search_str = "no more matches";
2483 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2484 				search_str = "no matches found";
2485 			else if (!view->search_next_done)
2486 				search_str = "searching...";
2487 		}
2488 
2489 		if (s->limit_view && s->commits->ncommits == 0)
2490 			limit_str = "no matches found";
2491 
2492 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2493 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2494 		    search_str ? search_str : (refs_str ? refs_str : ""),
2495 		    limit_str ? limit_str : "") == -1) {
2496 			err = got_error_from_errno("asprintf");
2497 			goto done;
2498 		}
2499 	}
2500 
2501 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2502 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2503 		    "........................................",
2504 		    s->in_repo_path, ncommits_str) == -1) {
2505 			err = got_error_from_errno("asprintf");
2506 			header = NULL;
2507 			goto done;
2508 		}
2509 	} else if (asprintf(&header, "commit %s%s",
2510 	    id_str ? id_str : "........................................",
2511 	    ncommits_str) == -1) {
2512 		err = got_error_from_errno("asprintf");
2513 		header = NULL;
2514 		goto done;
2515 	}
2516 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2517 	if (err)
2518 		goto done;
2519 
2520 	werase(view->window);
2521 
2522 	if (view_needs_focus_indication(view))
2523 		wstandout(view->window);
2524 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2525 	if (tc)
2526 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2527 	waddwstr(view->window, wline);
2528 	while (width < view->ncols) {
2529 		waddch(view->window, ' ');
2530 		width++;
2531 	}
2532 	if (tc)
2533 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2534 	if (view_needs_focus_indication(view))
2535 		wstandend(view->window);
2536 	free(wline);
2537 	if (limit <= 1)
2538 		goto done;
2539 
2540 	/* Grow author column size if necessary, and set view->maxx. */
2541 	entry = s->first_displayed_entry;
2542 	ncommits = 0;
2543 	view->maxx = 0;
2544 	while (entry) {
2545 		struct got_commit_object *c = entry->commit;
2546 		char *author, *eol, *msg, *msg0;
2547 		wchar_t *wauthor, *wmsg;
2548 		int width;
2549 		if (ncommits >= limit - 1)
2550 			break;
2551 		if (s->use_committer)
2552 			author = strdup(got_object_commit_get_committer(c));
2553 		else
2554 			author = strdup(got_object_commit_get_author(c));
2555 		if (author == NULL) {
2556 			err = got_error_from_errno("strdup");
2557 			goto done;
2558 		}
2559 		err = format_author(&wauthor, &width, author, COLS,
2560 		    date_display_cols);
2561 		if (author_cols < width)
2562 			author_cols = width;
2563 		free(wauthor);
2564 		free(author);
2565 		if (err)
2566 			goto done;
2567 		err = got_object_commit_get_logmsg(&msg0, c);
2568 		if (err)
2569 			goto done;
2570 		msg = msg0;
2571 		while (*msg == '\n')
2572 			++msg;
2573 		if ((eol = strchr(msg, '\n')))
2574 			*eol = '\0';
2575 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2576 		    date_display_cols + author_cols, 0);
2577 		if (err)
2578 			goto done;
2579 		view->maxx = MAX(view->maxx, width);
2580 		free(msg0);
2581 		free(wmsg);
2582 		ncommits++;
2583 		entry = TAILQ_NEXT(entry, entry);
2584 	}
2585 
2586 	entry = s->first_displayed_entry;
2587 	s->last_displayed_entry = s->first_displayed_entry;
2588 	ncommits = 0;
2589 	while (entry) {
2590 		if (ncommits >= limit - 1)
2591 			break;
2592 		if (ncommits == s->selected)
2593 			wstandout(view->window);
2594 		err = draw_commit(view, entry->commit, entry->id,
2595 		    date_display_cols, author_cols);
2596 		if (ncommits == s->selected)
2597 			wstandend(view->window);
2598 		if (err)
2599 			goto done;
2600 		ncommits++;
2601 		s->last_displayed_entry = entry;
2602 		entry = TAILQ_NEXT(entry, entry);
2603 	}
2604 
2605 	view_border(view);
2606 done:
2607 	free(id_str);
2608 	free(refs_str);
2609 	free(ncommits_str);
2610 	free(header);
2611 	return err;
2612 }
2613 
2614 static void
2615 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2616 {
2617 	struct commit_queue_entry *entry;
2618 	int nscrolled = 0;
2619 
2620 	entry = TAILQ_FIRST(&s->commits->head);
2621 	if (s->first_displayed_entry == entry)
2622 		return;
2623 
2624 	entry = s->first_displayed_entry;
2625 	while (entry && nscrolled < maxscroll) {
2626 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2627 		if (entry) {
2628 			s->first_displayed_entry = entry;
2629 			nscrolled++;
2630 		}
2631 	}
2632 }
2633 
2634 static const struct got_error *
2635 trigger_log_thread(struct tog_view *view, int wait)
2636 {
2637 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2638 	int errcode;
2639 
2640 	halfdelay(1); /* fast refresh while loading commits */
2641 
2642 	while (!ta->log_complete && !tog_thread_error &&
2643 	    (ta->commits_needed > 0 || ta->load_all)) {
2644 		/* Wake the log thread. */
2645 		errcode = pthread_cond_signal(&ta->need_commits);
2646 		if (errcode)
2647 			return got_error_set_errno(errcode,
2648 			    "pthread_cond_signal");
2649 
2650 		/*
2651 		 * The mutex will be released while the view loop waits
2652 		 * in wgetch(), at which time the log thread will run.
2653 		 */
2654 		if (!wait)
2655 			break;
2656 
2657 		/* Display progress update in log view. */
2658 		show_log_view(view);
2659 		update_panels();
2660 		doupdate();
2661 
2662 		/* Wait right here while next commit is being loaded. */
2663 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2664 		if (errcode)
2665 			return got_error_set_errno(errcode,
2666 			    "pthread_cond_wait");
2667 
2668 		/* Display progress update in log view. */
2669 		show_log_view(view);
2670 		update_panels();
2671 		doupdate();
2672 	}
2673 
2674 	return NULL;
2675 }
2676 
2677 static const struct got_error *
2678 request_log_commits(struct tog_view *view)
2679 {
2680 	struct tog_log_view_state	*state = &view->state.log;
2681 	const struct got_error		*err = NULL;
2682 
2683 	if (state->thread_args.log_complete)
2684 		return NULL;
2685 
2686 	state->thread_args.commits_needed += view->nscrolled;
2687 	err = trigger_log_thread(view, 1);
2688 	view->nscrolled = 0;
2689 
2690 	return err;
2691 }
2692 
2693 static const struct got_error *
2694 log_scroll_down(struct tog_view *view, int maxscroll)
2695 {
2696 	struct tog_log_view_state *s = &view->state.log;
2697 	const struct got_error *err = NULL;
2698 	struct commit_queue_entry *pentry;
2699 	int nscrolled = 0, ncommits_needed;
2700 
2701 	if (s->last_displayed_entry == NULL)
2702 		return NULL;
2703 
2704 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2705 	if (s->commits->ncommits < ncommits_needed &&
2706 	    !s->thread_args.log_complete) {
2707 		/*
2708 		 * Ask the log thread for required amount of commits.
2709 		 */
2710 		s->thread_args.commits_needed +=
2711 		    ncommits_needed - s->commits->ncommits;
2712 		err = trigger_log_thread(view, 1);
2713 		if (err)
2714 			return err;
2715 	}
2716 
2717 	do {
2718 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2719 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2720 			break;
2721 
2722 		s->last_displayed_entry = pentry ?
2723 		    pentry : s->last_displayed_entry;
2724 
2725 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2726 		if (pentry == NULL)
2727 			break;
2728 		s->first_displayed_entry = pentry;
2729 	} while (++nscrolled < maxscroll);
2730 
2731 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2732 		view->nscrolled += nscrolled;
2733 	else
2734 		view->nscrolled = 0;
2735 
2736 	return err;
2737 }
2738 
2739 static const struct got_error *
2740 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2741     struct got_commit_object *commit, struct got_object_id *commit_id,
2742     struct tog_view *log_view, struct got_repository *repo)
2743 {
2744 	const struct got_error *err;
2745 	struct got_object_qid *parent_id;
2746 	struct tog_view *diff_view;
2747 
2748 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2749 	if (diff_view == NULL)
2750 		return got_error_from_errno("view_open");
2751 
2752 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2753 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2754 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2755 	if (err == NULL)
2756 		*new_view = diff_view;
2757 	return err;
2758 }
2759 
2760 static const struct got_error *
2761 tree_view_visit_subtree(struct tog_tree_view_state *s,
2762     struct got_tree_object *subtree)
2763 {
2764 	struct tog_parent_tree *parent;
2765 
2766 	parent = calloc(1, sizeof(*parent));
2767 	if (parent == NULL)
2768 		return got_error_from_errno("calloc");
2769 
2770 	parent->tree = s->tree;
2771 	parent->first_displayed_entry = s->first_displayed_entry;
2772 	parent->selected_entry = s->selected_entry;
2773 	parent->selected = s->selected;
2774 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2775 	s->tree = subtree;
2776 	s->selected = 0;
2777 	s->first_displayed_entry = NULL;
2778 	return NULL;
2779 }
2780 
2781 static const struct got_error *
2782 tree_view_walk_path(struct tog_tree_view_state *s,
2783     struct got_commit_object *commit, const char *path)
2784 {
2785 	const struct got_error *err = NULL;
2786 	struct got_tree_object *tree = NULL;
2787 	const char *p;
2788 	char *slash, *subpath = NULL;
2789 
2790 	/* Walk the path and open corresponding tree objects. */
2791 	p = path;
2792 	while (*p) {
2793 		struct got_tree_entry *te;
2794 		struct got_object_id *tree_id;
2795 		char *te_name;
2796 
2797 		while (p[0] == '/')
2798 			p++;
2799 
2800 		/* Ensure the correct subtree entry is selected. */
2801 		slash = strchr(p, '/');
2802 		if (slash == NULL)
2803 			te_name = strdup(p);
2804 		else
2805 			te_name = strndup(p, slash - p);
2806 		if (te_name == NULL) {
2807 			err = got_error_from_errno("strndup");
2808 			break;
2809 		}
2810 		te = got_object_tree_find_entry(s->tree, te_name);
2811 		if (te == NULL) {
2812 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2813 			free(te_name);
2814 			break;
2815 		}
2816 		free(te_name);
2817 		s->first_displayed_entry = s->selected_entry = te;
2818 
2819 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2820 			break; /* jump to this file's entry */
2821 
2822 		slash = strchr(p, '/');
2823 		if (slash)
2824 			subpath = strndup(path, slash - path);
2825 		else
2826 			subpath = strdup(path);
2827 		if (subpath == NULL) {
2828 			err = got_error_from_errno("strdup");
2829 			break;
2830 		}
2831 
2832 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2833 		    subpath);
2834 		if (err)
2835 			break;
2836 
2837 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2838 		free(tree_id);
2839 		if (err)
2840 			break;
2841 
2842 		err = tree_view_visit_subtree(s, tree);
2843 		if (err) {
2844 			got_object_tree_close(tree);
2845 			break;
2846 		}
2847 		if (slash == NULL)
2848 			break;
2849 		free(subpath);
2850 		subpath = NULL;
2851 		p = slash;
2852 	}
2853 
2854 	free(subpath);
2855 	return err;
2856 }
2857 
2858 static const struct got_error *
2859 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2860     struct commit_queue_entry *entry, const char *path,
2861     const char *head_ref_name, struct got_repository *repo)
2862 {
2863 	const struct got_error *err = NULL;
2864 	struct tog_tree_view_state *s;
2865 	struct tog_view *tree_view;
2866 
2867 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2868 	if (tree_view == NULL)
2869 		return got_error_from_errno("view_open");
2870 
2871 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2872 	if (err)
2873 		return err;
2874 	s = &tree_view->state.tree;
2875 
2876 	*new_view = tree_view;
2877 
2878 	if (got_path_is_root_dir(path))
2879 		return NULL;
2880 
2881 	return tree_view_walk_path(s, entry->commit, path);
2882 }
2883 
2884 static const struct got_error *
2885 block_signals_used_by_main_thread(void)
2886 {
2887 	sigset_t sigset;
2888 	int errcode;
2889 
2890 	if (sigemptyset(&sigset) == -1)
2891 		return got_error_from_errno("sigemptyset");
2892 
2893 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2894 	if (sigaddset(&sigset, SIGWINCH) == -1)
2895 		return got_error_from_errno("sigaddset");
2896 	if (sigaddset(&sigset, SIGCONT) == -1)
2897 		return got_error_from_errno("sigaddset");
2898 	if (sigaddset(&sigset, SIGINT) == -1)
2899 		return got_error_from_errno("sigaddset");
2900 	if (sigaddset(&sigset, SIGTERM) == -1)
2901 		return got_error_from_errno("sigaddset");
2902 
2903 	/* ncurses handles SIGTSTP */
2904 	if (sigaddset(&sigset, SIGTSTP) == -1)
2905 		return got_error_from_errno("sigaddset");
2906 
2907 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2908 	if (errcode)
2909 		return got_error_set_errno(errcode, "pthread_sigmask");
2910 
2911 	return NULL;
2912 }
2913 
2914 static void *
2915 log_thread(void *arg)
2916 {
2917 	const struct got_error *err = NULL;
2918 	int errcode = 0;
2919 	struct tog_log_thread_args *a = arg;
2920 	int done = 0;
2921 
2922 	/*
2923 	 * Sync startup with main thread such that we begin our
2924 	 * work once view_input() has released the mutex.
2925 	 */
2926 	errcode = pthread_mutex_lock(&tog_mutex);
2927 	if (errcode) {
2928 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2929 		return (void *)err;
2930 	}
2931 
2932 	err = block_signals_used_by_main_thread();
2933 	if (err) {
2934 		pthread_mutex_unlock(&tog_mutex);
2935 		goto done;
2936 	}
2937 
2938 	while (!done && !err && !tog_fatal_signal_received()) {
2939 		errcode = pthread_mutex_unlock(&tog_mutex);
2940 		if (errcode) {
2941 			err = got_error_set_errno(errcode,
2942 			    "pthread_mutex_unlock");
2943 			goto done;
2944 		}
2945 		err = queue_commits(a);
2946 		if (err) {
2947 			if (err->code != GOT_ERR_ITER_COMPLETED)
2948 				goto done;
2949 			err = NULL;
2950 			done = 1;
2951 		} else if (a->commits_needed > 0 && !a->load_all) {
2952 			if (*a->limiting) {
2953 				if (a->limit_match)
2954 					a->commits_needed--;
2955 			} else
2956 				a->commits_needed--;
2957 		}
2958 
2959 		errcode = pthread_mutex_lock(&tog_mutex);
2960 		if (errcode) {
2961 			err = got_error_set_errno(errcode,
2962 			    "pthread_mutex_lock");
2963 			goto done;
2964 		} else if (*a->quit)
2965 			done = 1;
2966 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2967 			*a->first_displayed_entry =
2968 			    TAILQ_FIRST(&a->limit_commits->head);
2969 			*a->selected_entry = *a->first_displayed_entry;
2970 		} else if (*a->first_displayed_entry == NULL) {
2971 			*a->first_displayed_entry =
2972 			    TAILQ_FIRST(&a->real_commits->head);
2973 			*a->selected_entry = *a->first_displayed_entry;
2974 		}
2975 
2976 		errcode = pthread_cond_signal(&a->commit_loaded);
2977 		if (errcode) {
2978 			err = got_error_set_errno(errcode,
2979 			    "pthread_cond_signal");
2980 			pthread_mutex_unlock(&tog_mutex);
2981 			goto done;
2982 		}
2983 
2984 		if (done)
2985 			a->commits_needed = 0;
2986 		else {
2987 			if (a->commits_needed == 0 && !a->load_all) {
2988 				errcode = pthread_cond_wait(&a->need_commits,
2989 				    &tog_mutex);
2990 				if (errcode) {
2991 					err = got_error_set_errno(errcode,
2992 					    "pthread_cond_wait");
2993 					pthread_mutex_unlock(&tog_mutex);
2994 					goto done;
2995 				}
2996 				if (*a->quit)
2997 					done = 1;
2998 			}
2999 		}
3000 	}
3001 	a->log_complete = 1;
3002 	errcode = pthread_mutex_unlock(&tog_mutex);
3003 	if (errcode)
3004 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3005 done:
3006 	if (err) {
3007 		tog_thread_error = 1;
3008 		pthread_cond_signal(&a->commit_loaded);
3009 	}
3010 	return (void *)err;
3011 }
3012 
3013 static const struct got_error *
3014 stop_log_thread(struct tog_log_view_state *s)
3015 {
3016 	const struct got_error *err = NULL, *thread_err = NULL;
3017 	int errcode;
3018 
3019 	if (s->thread) {
3020 		s->quit = 1;
3021 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3022 		if (errcode)
3023 			return got_error_set_errno(errcode,
3024 			    "pthread_cond_signal");
3025 		errcode = pthread_mutex_unlock(&tog_mutex);
3026 		if (errcode)
3027 			return got_error_set_errno(errcode,
3028 			    "pthread_mutex_unlock");
3029 		errcode = pthread_join(s->thread, (void **)&thread_err);
3030 		if (errcode)
3031 			return got_error_set_errno(errcode, "pthread_join");
3032 		errcode = pthread_mutex_lock(&tog_mutex);
3033 		if (errcode)
3034 			return got_error_set_errno(errcode,
3035 			    "pthread_mutex_lock");
3036 		s->thread = NULL;
3037 	}
3038 
3039 	if (s->thread_args.repo) {
3040 		err = got_repo_close(s->thread_args.repo);
3041 		s->thread_args.repo = NULL;
3042 	}
3043 
3044 	if (s->thread_args.pack_fds) {
3045 		const struct got_error *pack_err =
3046 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3047 		if (err == NULL)
3048 			err = pack_err;
3049 		s->thread_args.pack_fds = NULL;
3050 	}
3051 
3052 	if (s->thread_args.graph) {
3053 		got_commit_graph_close(s->thread_args.graph);
3054 		s->thread_args.graph = NULL;
3055 	}
3056 
3057 	return err ? err : thread_err;
3058 }
3059 
3060 static const struct got_error *
3061 close_log_view(struct tog_view *view)
3062 {
3063 	const struct got_error *err = NULL;
3064 	struct tog_log_view_state *s = &view->state.log;
3065 	int errcode;
3066 
3067 	err = stop_log_thread(s);
3068 
3069 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3070 	if (errcode && err == NULL)
3071 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3072 
3073 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3074 	if (errcode && err == NULL)
3075 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3076 
3077 	free_commits(&s->limit_commits);
3078 	free_commits(&s->real_commits);
3079 	free(s->in_repo_path);
3080 	s->in_repo_path = NULL;
3081 	free(s->start_id);
3082 	s->start_id = NULL;
3083 	free(s->head_ref_name);
3084 	s->head_ref_name = NULL;
3085 	return err;
3086 }
3087 
3088 /*
3089  * We use two queues to implement the limit feature: first consists of
3090  * commits matching the current limit_regex; second is the real queue
3091  * of all known commits (real_commits). When the user starts limiting,
3092  * we swap queues such that all movement and displaying functionality
3093  * works with very slight change.
3094  */
3095 static const struct got_error *
3096 limit_log_view(struct tog_view *view)
3097 {
3098 	struct tog_log_view_state *s = &view->state.log;
3099 	struct commit_queue_entry *entry;
3100 	struct tog_view	*v = view;
3101 	const struct got_error *err = NULL;
3102 	char pattern[1024];
3103 	int ret;
3104 
3105 	if (view_is_hsplit_top(view))
3106 		v = view->child;
3107 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3108 		v = view->parent;
3109 
3110 	/* Get the pattern */
3111 	wmove(v->window, v->nlines - 1, 0);
3112 	wclrtoeol(v->window);
3113 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3114 	nodelay(v->window, FALSE);
3115 	nocbreak();
3116 	echo();
3117 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3118 	cbreak();
3119 	noecho();
3120 	nodelay(v->window, TRUE);
3121 	if (ret == ERR)
3122 		return NULL;
3123 
3124 	if (*pattern == '\0') {
3125 		/*
3126 		 * Safety measure for the situation where the user
3127 		 * resets limit without previously limiting anything.
3128 		 */
3129 		if (!s->limit_view)
3130 			return NULL;
3131 
3132 		/*
3133 		 * User could have pressed Ctrl+L, which refreshed the
3134 		 * commit queues, it means we can't save previously
3135 		 * (before limit took place) displayed entries,
3136 		 * because they would point to already free'ed memory,
3137 		 * so we are forced to always select first entry of
3138 		 * the queue.
3139 		 */
3140 		s->commits = &s->real_commits;
3141 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3142 		s->selected_entry = s->first_displayed_entry;
3143 		s->selected = 0;
3144 		s->limit_view = 0;
3145 
3146 		return NULL;
3147 	}
3148 
3149 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3150 		return NULL;
3151 
3152 	s->limit_view = 1;
3153 
3154 	/* Clear the screen while loading limit view */
3155 	s->first_displayed_entry = NULL;
3156 	s->last_displayed_entry = NULL;
3157 	s->selected_entry = NULL;
3158 	s->commits = &s->limit_commits;
3159 
3160 	/* Prepare limit queue for new search */
3161 	free_commits(&s->limit_commits);
3162 	s->limit_commits.ncommits = 0;
3163 
3164 	/* First process commits, which are in queue already */
3165 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3166 		int have_match = 0;
3167 
3168 		err = match_commit(&have_match, entry->id,
3169 		    entry->commit, &s->limit_regex);
3170 		if (err)
3171 			return err;
3172 
3173 		if (have_match) {
3174 			struct commit_queue_entry *matched;
3175 
3176 			matched = alloc_commit_queue_entry(entry->commit,
3177 			    entry->id);
3178 			if (matched == NULL) {
3179 				err = got_error_from_errno(
3180 				    "alloc_commit_queue_entry");
3181 				break;
3182 			}
3183 			matched->commit = entry->commit;
3184 			got_object_commit_retain(entry->commit);
3185 
3186 			matched->idx = s->limit_commits.ncommits;
3187 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3188 			    matched, entry);
3189 			s->limit_commits.ncommits++;
3190 		}
3191 	}
3192 
3193 	/* Second process all the commits, until we fill the screen */
3194 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3195 	    !s->thread_args.log_complete) {
3196 		s->thread_args.commits_needed +=
3197 		    view->nlines - s->limit_commits.ncommits - 1;
3198 		err = trigger_log_thread(view, 1);
3199 		if (err)
3200 			return err;
3201 	}
3202 
3203 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3204 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3205 	s->selected = 0;
3206 
3207 	return NULL;
3208 }
3209 
3210 static const struct got_error *
3211 search_start_log_view(struct tog_view *view)
3212 {
3213 	struct tog_log_view_state *s = &view->state.log;
3214 
3215 	s->matched_entry = NULL;
3216 	s->search_entry = NULL;
3217 	return NULL;
3218 }
3219 
3220 static const struct got_error *
3221 search_next_log_view(struct tog_view *view)
3222 {
3223 	const struct got_error *err = NULL;
3224 	struct tog_log_view_state *s = &view->state.log;
3225 	struct commit_queue_entry *entry;
3226 
3227 	/* Display progress update in log view. */
3228 	show_log_view(view);
3229 	update_panels();
3230 	doupdate();
3231 
3232 	if (s->search_entry) {
3233 		int errcode, ch;
3234 		errcode = pthread_mutex_unlock(&tog_mutex);
3235 		if (errcode)
3236 			return got_error_set_errno(errcode,
3237 			    "pthread_mutex_unlock");
3238 		ch = wgetch(view->window);
3239 		errcode = pthread_mutex_lock(&tog_mutex);
3240 		if (errcode)
3241 			return got_error_set_errno(errcode,
3242 			    "pthread_mutex_lock");
3243 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3244 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3245 			return NULL;
3246 		}
3247 		if (view->searching == TOG_SEARCH_FORWARD)
3248 			entry = TAILQ_NEXT(s->search_entry, entry);
3249 		else
3250 			entry = TAILQ_PREV(s->search_entry,
3251 			    commit_queue_head, entry);
3252 	} else if (s->matched_entry) {
3253 		/*
3254 		 * If the user has moved the cursor after we hit a match,
3255 		 * the position from where we should continue searching
3256 		 * might have changed.
3257 		 */
3258 		if (view->searching == TOG_SEARCH_FORWARD)
3259 			entry = TAILQ_NEXT(s->selected_entry, entry);
3260 		else
3261 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3262 			    entry);
3263 	} else {
3264 		entry = s->selected_entry;
3265 	}
3266 
3267 	while (1) {
3268 		int have_match = 0;
3269 
3270 		if (entry == NULL) {
3271 			if (s->thread_args.log_complete ||
3272 			    view->searching == TOG_SEARCH_BACKWARD) {
3273 				view->search_next_done =
3274 				    (s->matched_entry == NULL ?
3275 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3276 				s->search_entry = NULL;
3277 				return NULL;
3278 			}
3279 			/*
3280 			 * Poke the log thread for more commits and return,
3281 			 * allowing the main loop to make progress. Search
3282 			 * will resume at s->search_entry once we come back.
3283 			 */
3284 			s->thread_args.commits_needed++;
3285 			return trigger_log_thread(view, 0);
3286 		}
3287 
3288 		err = match_commit(&have_match, entry->id, entry->commit,
3289 		    &view->regex);
3290 		if (err)
3291 			break;
3292 		if (have_match) {
3293 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3294 			s->matched_entry = entry;
3295 			break;
3296 		}
3297 
3298 		s->search_entry = entry;
3299 		if (view->searching == TOG_SEARCH_FORWARD)
3300 			entry = TAILQ_NEXT(entry, entry);
3301 		else
3302 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3303 	}
3304 
3305 	if (s->matched_entry) {
3306 		int cur = s->selected_entry->idx;
3307 		while (cur < s->matched_entry->idx) {
3308 			err = input_log_view(NULL, view, KEY_DOWN);
3309 			if (err)
3310 				return err;
3311 			cur++;
3312 		}
3313 		while (cur > s->matched_entry->idx) {
3314 			err = input_log_view(NULL, view, KEY_UP);
3315 			if (err)
3316 				return err;
3317 			cur--;
3318 		}
3319 	}
3320 
3321 	s->search_entry = NULL;
3322 
3323 	return NULL;
3324 }
3325 
3326 static const struct got_error *
3327 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3328     struct got_repository *repo, const char *head_ref_name,
3329     const char *in_repo_path, int log_branches)
3330 {
3331 	const struct got_error *err = NULL;
3332 	struct tog_log_view_state *s = &view->state.log;
3333 	struct got_repository *thread_repo = NULL;
3334 	struct got_commit_graph *thread_graph = NULL;
3335 	int errcode;
3336 
3337 	if (in_repo_path != s->in_repo_path) {
3338 		free(s->in_repo_path);
3339 		s->in_repo_path = strdup(in_repo_path);
3340 		if (s->in_repo_path == NULL)
3341 			return got_error_from_errno("strdup");
3342 	}
3343 
3344 	/* The commit queue only contains commits being displayed. */
3345 	TAILQ_INIT(&s->real_commits.head);
3346 	s->real_commits.ncommits = 0;
3347 	s->commits = &s->real_commits;
3348 
3349 	TAILQ_INIT(&s->limit_commits.head);
3350 	s->limit_view = 0;
3351 	s->limit_commits.ncommits = 0;
3352 
3353 	s->repo = repo;
3354 	if (head_ref_name) {
3355 		s->head_ref_name = strdup(head_ref_name);
3356 		if (s->head_ref_name == NULL) {
3357 			err = got_error_from_errno("strdup");
3358 			goto done;
3359 		}
3360 	}
3361 	s->start_id = got_object_id_dup(start_id);
3362 	if (s->start_id == NULL) {
3363 		err = got_error_from_errno("got_object_id_dup");
3364 		goto done;
3365 	}
3366 	s->log_branches = log_branches;
3367 	s->use_committer = 1;
3368 
3369 	STAILQ_INIT(&s->colors);
3370 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3371 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3372 		    get_color_value("TOG_COLOR_COMMIT"));
3373 		if (err)
3374 			goto done;
3375 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3376 		    get_color_value("TOG_COLOR_AUTHOR"));
3377 		if (err) {
3378 			free_colors(&s->colors);
3379 			goto done;
3380 		}
3381 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3382 		    get_color_value("TOG_COLOR_DATE"));
3383 		if (err) {
3384 			free_colors(&s->colors);
3385 			goto done;
3386 		}
3387 	}
3388 
3389 	view->show = show_log_view;
3390 	view->input = input_log_view;
3391 	view->resize = resize_log_view;
3392 	view->close = close_log_view;
3393 	view->search_start = search_start_log_view;
3394 	view->search_next = search_next_log_view;
3395 
3396 	if (s->thread_args.pack_fds == NULL) {
3397 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3398 		if (err)
3399 			goto done;
3400 	}
3401 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3402 	    s->thread_args.pack_fds);
3403 	if (err)
3404 		goto done;
3405 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3406 	    !s->log_branches);
3407 	if (err)
3408 		goto done;
3409 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3410 	    s->repo, NULL, NULL);
3411 	if (err)
3412 		goto done;
3413 
3414 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3415 	if (errcode) {
3416 		err = got_error_set_errno(errcode, "pthread_cond_init");
3417 		goto done;
3418 	}
3419 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3420 	if (errcode) {
3421 		err = got_error_set_errno(errcode, "pthread_cond_init");
3422 		goto done;
3423 	}
3424 
3425 	s->thread_args.commits_needed = view->nlines;
3426 	s->thread_args.graph = thread_graph;
3427 	s->thread_args.real_commits = &s->real_commits;
3428 	s->thread_args.limit_commits = &s->limit_commits;
3429 	s->thread_args.in_repo_path = s->in_repo_path;
3430 	s->thread_args.start_id = s->start_id;
3431 	s->thread_args.repo = thread_repo;
3432 	s->thread_args.log_complete = 0;
3433 	s->thread_args.quit = &s->quit;
3434 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3435 	s->thread_args.selected_entry = &s->selected_entry;
3436 	s->thread_args.searching = &view->searching;
3437 	s->thread_args.search_next_done = &view->search_next_done;
3438 	s->thread_args.regex = &view->regex;
3439 	s->thread_args.limiting = &s->limit_view;
3440 	s->thread_args.limit_regex = &s->limit_regex;
3441 	s->thread_args.limit_commits = &s->limit_commits;
3442 done:
3443 	if (err)
3444 		close_log_view(view);
3445 	return err;
3446 }
3447 
3448 static const struct got_error *
3449 show_log_view(struct tog_view *view)
3450 {
3451 	const struct got_error *err;
3452 	struct tog_log_view_state *s = &view->state.log;
3453 
3454 	if (s->thread == NULL) {
3455 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3456 		    &s->thread_args);
3457 		if (errcode)
3458 			return got_error_set_errno(errcode, "pthread_create");
3459 		if (s->thread_args.commits_needed > 0) {
3460 			err = trigger_log_thread(view, 1);
3461 			if (err)
3462 				return err;
3463 		}
3464 	}
3465 
3466 	return draw_commits(view);
3467 }
3468 
3469 static void
3470 log_move_cursor_up(struct tog_view *view, int page, int home)
3471 {
3472 	struct tog_log_view_state *s = &view->state.log;
3473 
3474 	if (s->first_displayed_entry == NULL)
3475 		return;
3476 	if (s->selected_entry->idx == 0)
3477 		view->count = 0;
3478 
3479 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3480 	    || home)
3481 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3482 
3483 	if (!page && !home && s->selected > 0)
3484 		--s->selected;
3485 	else
3486 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3487 
3488 	select_commit(s);
3489 	return;
3490 }
3491 
3492 static const struct got_error *
3493 log_move_cursor_down(struct tog_view *view, int page)
3494 {
3495 	struct tog_log_view_state	*s = &view->state.log;
3496 	const struct got_error		*err = NULL;
3497 	int				 eos = view->nlines - 2;
3498 
3499 	if (s->first_displayed_entry == NULL)
3500 		return NULL;
3501 
3502 	if (s->thread_args.log_complete &&
3503 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3504 		return NULL;
3505 
3506 	if (view_is_hsplit_top(view))
3507 		--eos;  /* border consumes the last line */
3508 
3509 	if (!page) {
3510 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3511 			++s->selected;
3512 		else
3513 			err = log_scroll_down(view, 1);
3514 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3515 		struct commit_queue_entry *entry;
3516 		int n;
3517 
3518 		s->selected = 0;
3519 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3520 		s->last_displayed_entry = entry;
3521 		for (n = 0; n <= eos; n++) {
3522 			if (entry == NULL)
3523 				break;
3524 			s->first_displayed_entry = entry;
3525 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3526 		}
3527 		if (n > 0)
3528 			s->selected = n - 1;
3529 	} else {
3530 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3531 		    s->thread_args.log_complete)
3532 			s->selected += MIN(page,
3533 			    s->commits->ncommits - s->selected_entry->idx - 1);
3534 		else
3535 			err = log_scroll_down(view, page);
3536 	}
3537 	if (err)
3538 		return err;
3539 
3540 	/*
3541 	 * We might necessarily overshoot in horizontal
3542 	 * splits; if so, select the last displayed commit.
3543 	 */
3544 	if (s->first_displayed_entry && s->last_displayed_entry) {
3545 		s->selected = MIN(s->selected,
3546 		    s->last_displayed_entry->idx -
3547 		    s->first_displayed_entry->idx);
3548 	}
3549 
3550 	select_commit(s);
3551 
3552 	if (s->thread_args.log_complete &&
3553 	    s->selected_entry->idx == s->commits->ncommits - 1)
3554 		view->count = 0;
3555 
3556 	return NULL;
3557 }
3558 
3559 static void
3560 view_get_split(struct tog_view *view, int *y, int *x)
3561 {
3562 	*x = 0;
3563 	*y = 0;
3564 
3565 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3566 		if (view->child && view->child->resized_y)
3567 			*y = view->child->resized_y;
3568 		else if (view->resized_y)
3569 			*y = view->resized_y;
3570 		else
3571 			*y = view_split_begin_y(view->lines);
3572 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3573 		if (view->child && view->child->resized_x)
3574 			*x = view->child->resized_x;
3575 		else if (view->resized_x)
3576 			*x = view->resized_x;
3577 		else
3578 			*x = view_split_begin_x(view->begin_x);
3579 	}
3580 }
3581 
3582 /* Split view horizontally at y and offset view->state->selected line. */
3583 static const struct got_error *
3584 view_init_hsplit(struct tog_view *view, int y)
3585 {
3586 	const struct got_error *err = NULL;
3587 
3588 	view->nlines = y;
3589 	view->ncols = COLS;
3590 	err = view_resize(view);
3591 	if (err)
3592 		return err;
3593 
3594 	err = offset_selection_down(view);
3595 
3596 	return err;
3597 }
3598 
3599 static const struct got_error *
3600 log_goto_line(struct tog_view *view, int nlines)
3601 {
3602 	const struct got_error		*err = NULL;
3603 	struct tog_log_view_state	*s = &view->state.log;
3604 	int				 g, idx = s->selected_entry->idx;
3605 
3606 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3607 		return NULL;
3608 
3609 	g = view->gline;
3610 	view->gline = 0;
3611 
3612 	if (g >= s->first_displayed_entry->idx + 1 &&
3613 	    g <= s->last_displayed_entry->idx + 1 &&
3614 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3615 		s->selected = g - s->first_displayed_entry->idx - 1;
3616 		select_commit(s);
3617 		return NULL;
3618 	}
3619 
3620 	if (idx + 1 < g) {
3621 		err = log_move_cursor_down(view, g - idx - 1);
3622 		if (!err && g > s->selected_entry->idx + 1)
3623 			err = log_move_cursor_down(view,
3624 			    g - s->first_displayed_entry->idx - 1);
3625 		if (err)
3626 			return err;
3627 	} else if (idx + 1 > g)
3628 		log_move_cursor_up(view, idx - g + 1, 0);
3629 
3630 	if (g < nlines && s->first_displayed_entry->idx == 0)
3631 		s->selected = g - 1;
3632 
3633 	select_commit(s);
3634 	return NULL;
3635 
3636 }
3637 
3638 static const struct got_error *
3639 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3640 {
3641 	const struct got_error *err = NULL;
3642 	struct tog_log_view_state *s = &view->state.log;
3643 	int eos, nscroll;
3644 
3645 	if (s->thread_args.load_all) {
3646 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3647 			s->thread_args.load_all = 0;
3648 		else if (s->thread_args.log_complete) {
3649 			err = log_move_cursor_down(view, s->commits->ncommits);
3650 			s->thread_args.load_all = 0;
3651 		}
3652 		if (err)
3653 			return err;
3654 	}
3655 
3656 	eos = nscroll = view->nlines - 1;
3657 	if (view_is_hsplit_top(view))
3658 		--eos;  /* border */
3659 
3660 	if (view->gline)
3661 		return log_goto_line(view, eos);
3662 
3663 	switch (ch) {
3664 	case '&':
3665 		err = limit_log_view(view);
3666 		break;
3667 	case 'q':
3668 		s->quit = 1;
3669 		break;
3670 	case '0':
3671 		view->x = 0;
3672 		break;
3673 	case '$':
3674 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3675 		view->count = 0;
3676 		break;
3677 	case KEY_RIGHT:
3678 	case 'l':
3679 		if (view->x + view->ncols / 2 < view->maxx)
3680 			view->x += 2;  /* move two columns right */
3681 		else
3682 			view->count = 0;
3683 		break;
3684 	case KEY_LEFT:
3685 	case 'h':
3686 		view->x -= MIN(view->x, 2);  /* move two columns back */
3687 		if (view->x <= 0)
3688 			view->count = 0;
3689 		break;
3690 	case 'k':
3691 	case KEY_UP:
3692 	case '<':
3693 	case ',':
3694 	case CTRL('p'):
3695 		log_move_cursor_up(view, 0, 0);
3696 		break;
3697 	case 'g':
3698 	case '=':
3699 	case KEY_HOME:
3700 		log_move_cursor_up(view, 0, 1);
3701 		view->count = 0;
3702 		break;
3703 	case CTRL('u'):
3704 	case 'u':
3705 		nscroll /= 2;
3706 		/* FALL THROUGH */
3707 	case KEY_PPAGE:
3708 	case CTRL('b'):
3709 	case 'b':
3710 		log_move_cursor_up(view, nscroll, 0);
3711 		break;
3712 	case 'j':
3713 	case KEY_DOWN:
3714 	case '>':
3715 	case '.':
3716 	case CTRL('n'):
3717 		err = log_move_cursor_down(view, 0);
3718 		break;
3719 	case '@':
3720 		s->use_committer = !s->use_committer;
3721 		break;
3722 	case 'G':
3723 	case '*':
3724 	case KEY_END: {
3725 		/* We don't know yet how many commits, so we're forced to
3726 		 * traverse them all. */
3727 		view->count = 0;
3728 		s->thread_args.load_all = 1;
3729 		if (!s->thread_args.log_complete)
3730 			return trigger_log_thread(view, 0);
3731 		err = log_move_cursor_down(view, s->commits->ncommits);
3732 		s->thread_args.load_all = 0;
3733 		break;
3734 	}
3735 	case CTRL('d'):
3736 	case 'd':
3737 		nscroll /= 2;
3738 		/* FALL THROUGH */
3739 	case KEY_NPAGE:
3740 	case CTRL('f'):
3741 	case 'f':
3742 	case ' ':
3743 		err = log_move_cursor_down(view, nscroll);
3744 		break;
3745 	case KEY_RESIZE:
3746 		if (s->selected > view->nlines - 2)
3747 			s->selected = view->nlines - 2;
3748 		if (s->selected > s->commits->ncommits - 1)
3749 			s->selected = s->commits->ncommits - 1;
3750 		select_commit(s);
3751 		if (s->commits->ncommits < view->nlines - 1 &&
3752 		    !s->thread_args.log_complete) {
3753 			s->thread_args.commits_needed += (view->nlines - 1) -
3754 			    s->commits->ncommits;
3755 			err = trigger_log_thread(view, 1);
3756 		}
3757 		break;
3758 	case KEY_ENTER:
3759 	case '\r':
3760 		view->count = 0;
3761 		if (s->selected_entry == NULL)
3762 			break;
3763 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3764 		break;
3765 	case 'T':
3766 		view->count = 0;
3767 		if (s->selected_entry == NULL)
3768 			break;
3769 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3770 		break;
3771 	case KEY_BACKSPACE:
3772 	case CTRL('l'):
3773 	case 'B':
3774 		view->count = 0;
3775 		if (ch == KEY_BACKSPACE &&
3776 		    got_path_is_root_dir(s->in_repo_path))
3777 			break;
3778 		err = stop_log_thread(s);
3779 		if (err)
3780 			return err;
3781 		if (ch == KEY_BACKSPACE) {
3782 			char *parent_path;
3783 			err = got_path_dirname(&parent_path, s->in_repo_path);
3784 			if (err)
3785 				return err;
3786 			free(s->in_repo_path);
3787 			s->in_repo_path = parent_path;
3788 			s->thread_args.in_repo_path = s->in_repo_path;
3789 		} else if (ch == CTRL('l')) {
3790 			struct got_object_id *start_id;
3791 			err = got_repo_match_object_id(&start_id, NULL,
3792 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3793 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3794 			if (err) {
3795 				if (s->head_ref_name == NULL ||
3796 				    err->code != GOT_ERR_NOT_REF)
3797 					return err;
3798 				/* Try to cope with deleted references. */
3799 				free(s->head_ref_name);
3800 				s->head_ref_name = NULL;
3801 				err = got_repo_match_object_id(&start_id,
3802 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3803 				    &tog_refs, s->repo);
3804 				if (err)
3805 					return err;
3806 			}
3807 			free(s->start_id);
3808 			s->start_id = start_id;
3809 			s->thread_args.start_id = s->start_id;
3810 		} else /* 'B' */
3811 			s->log_branches = !s->log_branches;
3812 
3813 		if (s->thread_args.pack_fds == NULL) {
3814 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3815 			if (err)
3816 				return err;
3817 		}
3818 		err = got_repo_open(&s->thread_args.repo,
3819 		    got_repo_get_path(s->repo), NULL,
3820 		    s->thread_args.pack_fds);
3821 		if (err)
3822 			return err;
3823 		tog_free_refs();
3824 		err = tog_load_refs(s->repo, 0);
3825 		if (err)
3826 			return err;
3827 		err = got_commit_graph_open(&s->thread_args.graph,
3828 		    s->in_repo_path, !s->log_branches);
3829 		if (err)
3830 			return err;
3831 		err = got_commit_graph_iter_start(s->thread_args.graph,
3832 		    s->start_id, s->repo, NULL, NULL);
3833 		if (err)
3834 			return err;
3835 		free_commits(&s->real_commits);
3836 		free_commits(&s->limit_commits);
3837 		s->first_displayed_entry = NULL;
3838 		s->last_displayed_entry = NULL;
3839 		s->selected_entry = NULL;
3840 		s->selected = 0;
3841 		s->thread_args.log_complete = 0;
3842 		s->quit = 0;
3843 		s->thread_args.commits_needed = view->lines;
3844 		s->matched_entry = NULL;
3845 		s->search_entry = NULL;
3846 		view->offset = 0;
3847 		break;
3848 	case 'R':
3849 		view->count = 0;
3850 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3851 		break;
3852 	default:
3853 		view->count = 0;
3854 		break;
3855 	}
3856 
3857 	return err;
3858 }
3859 
3860 static const struct got_error *
3861 apply_unveil(const char *repo_path, const char *worktree_path)
3862 {
3863 	const struct got_error *error;
3864 
3865 #ifdef PROFILE
3866 	if (unveil("gmon.out", "rwc") != 0)
3867 		return got_error_from_errno2("unveil", "gmon.out");
3868 #endif
3869 	if (repo_path && unveil(repo_path, "r") != 0)
3870 		return got_error_from_errno2("unveil", repo_path);
3871 
3872 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3873 		return got_error_from_errno2("unveil", worktree_path);
3874 
3875 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3876 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3877 
3878 	error = got_privsep_unveil_exec_helpers();
3879 	if (error != NULL)
3880 		return error;
3881 
3882 	if (unveil(NULL, NULL) != 0)
3883 		return got_error_from_errno("unveil");
3884 
3885 	return NULL;
3886 }
3887 
3888 static void
3889 init_curses(void)
3890 {
3891 	/*
3892 	 * Override default signal handlers before starting ncurses.
3893 	 * This should prevent ncurses from installing its own
3894 	 * broken cleanup() signal handler.
3895 	 */
3896 	signal(SIGWINCH, tog_sigwinch);
3897 	signal(SIGPIPE, tog_sigpipe);
3898 	signal(SIGCONT, tog_sigcont);
3899 	signal(SIGINT, tog_sigint);
3900 	signal(SIGTERM, tog_sigterm);
3901 
3902 	initscr();
3903 	cbreak();
3904 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3905 	noecho();
3906 	nonl();
3907 	intrflush(stdscr, FALSE);
3908 	keypad(stdscr, TRUE);
3909 	curs_set(0);
3910 	if (getenv("TOG_COLORS") != NULL) {
3911 		start_color();
3912 		use_default_colors();
3913 	}
3914 }
3915 
3916 static const struct got_error *
3917 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3918     struct got_repository *repo, struct got_worktree *worktree)
3919 {
3920 	const struct got_error *err = NULL;
3921 
3922 	if (argc == 0) {
3923 		*in_repo_path = strdup("/");
3924 		if (*in_repo_path == NULL)
3925 			return got_error_from_errno("strdup");
3926 		return NULL;
3927 	}
3928 
3929 	if (worktree) {
3930 		const char *prefix = got_worktree_get_path_prefix(worktree);
3931 		char *p;
3932 
3933 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3934 		if (err)
3935 			return err;
3936 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3937 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3938 		    p) == -1) {
3939 			err = got_error_from_errno("asprintf");
3940 			*in_repo_path = NULL;
3941 		}
3942 		free(p);
3943 	} else
3944 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3945 
3946 	return err;
3947 }
3948 
3949 static const struct got_error *
3950 cmd_log(int argc, char *argv[])
3951 {
3952 	const struct got_error *error;
3953 	struct got_repository *repo = NULL;
3954 	struct got_worktree *worktree = NULL;
3955 	struct got_object_id *start_id = NULL;
3956 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3957 	char *start_commit = NULL, *label = NULL;
3958 	struct got_reference *ref = NULL;
3959 	const char *head_ref_name = NULL;
3960 	int ch, log_branches = 0;
3961 	struct tog_view *view;
3962 	int *pack_fds = NULL;
3963 
3964 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3965 		switch (ch) {
3966 		case 'b':
3967 			log_branches = 1;
3968 			break;
3969 		case 'c':
3970 			start_commit = optarg;
3971 			break;
3972 		case 'r':
3973 			repo_path = realpath(optarg, NULL);
3974 			if (repo_path == NULL)
3975 				return got_error_from_errno2("realpath",
3976 				    optarg);
3977 			break;
3978 		default:
3979 			usage_log();
3980 			/* NOTREACHED */
3981 		}
3982 	}
3983 
3984 	argc -= optind;
3985 	argv += optind;
3986 
3987 	if (argc > 1)
3988 		usage_log();
3989 
3990 	error = got_repo_pack_fds_open(&pack_fds);
3991 	if (error != NULL)
3992 		goto done;
3993 
3994 	if (repo_path == NULL) {
3995 		cwd = getcwd(NULL, 0);
3996 		if (cwd == NULL)
3997 			return got_error_from_errno("getcwd");
3998 		error = got_worktree_open(&worktree, cwd);
3999 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4000 			goto done;
4001 		if (worktree)
4002 			repo_path =
4003 			    strdup(got_worktree_get_repo_path(worktree));
4004 		else
4005 			repo_path = strdup(cwd);
4006 		if (repo_path == NULL) {
4007 			error = got_error_from_errno("strdup");
4008 			goto done;
4009 		}
4010 	}
4011 
4012 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4013 	if (error != NULL)
4014 		goto done;
4015 
4016 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4017 	    repo, worktree);
4018 	if (error)
4019 		goto done;
4020 
4021 	init_curses();
4022 
4023 	error = apply_unveil(got_repo_get_path(repo),
4024 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4025 	if (error)
4026 		goto done;
4027 
4028 	/* already loaded by tog_log_with_path()? */
4029 	if (TAILQ_EMPTY(&tog_refs)) {
4030 		error = tog_load_refs(repo, 0);
4031 		if (error)
4032 			goto done;
4033 	}
4034 
4035 	if (start_commit == NULL) {
4036 		error = got_repo_match_object_id(&start_id, &label,
4037 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4038 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4039 		if (error)
4040 			goto done;
4041 		head_ref_name = label;
4042 	} else {
4043 		error = got_ref_open(&ref, repo, start_commit, 0);
4044 		if (error == NULL)
4045 			head_ref_name = got_ref_get_name(ref);
4046 		else if (error->code != GOT_ERR_NOT_REF)
4047 			goto done;
4048 		error = got_repo_match_object_id(&start_id, NULL,
4049 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4050 		if (error)
4051 			goto done;
4052 	}
4053 
4054 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4055 	if (view == NULL) {
4056 		error = got_error_from_errno("view_open");
4057 		goto done;
4058 	}
4059 	error = open_log_view(view, start_id, repo, head_ref_name,
4060 	    in_repo_path, log_branches);
4061 	if (error)
4062 		goto done;
4063 	if (worktree) {
4064 		/* Release work tree lock. */
4065 		got_worktree_close(worktree);
4066 		worktree = NULL;
4067 	}
4068 	error = view_loop(view);
4069 done:
4070 	free(in_repo_path);
4071 	free(repo_path);
4072 	free(cwd);
4073 	free(start_id);
4074 	free(label);
4075 	if (ref)
4076 		got_ref_close(ref);
4077 	if (repo) {
4078 		const struct got_error *close_err = got_repo_close(repo);
4079 		if (error == NULL)
4080 			error = close_err;
4081 	}
4082 	if (worktree)
4083 		got_worktree_close(worktree);
4084 	if (pack_fds) {
4085 		const struct got_error *pack_err =
4086 		    got_repo_pack_fds_close(pack_fds);
4087 		if (error == NULL)
4088 			error = pack_err;
4089 	}
4090 	tog_free_refs();
4091 	return error;
4092 }
4093 
4094 __dead static void
4095 usage_diff(void)
4096 {
4097 	endwin();
4098 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4099 	    "object1 object2\n", getprogname());
4100 	exit(1);
4101 }
4102 
4103 static int
4104 match_line(const char *line, regex_t *regex, size_t nmatch,
4105     regmatch_t *regmatch)
4106 {
4107 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4108 }
4109 
4110 static struct tog_color *
4111 match_color(struct tog_colors *colors, const char *line)
4112 {
4113 	struct tog_color *tc = NULL;
4114 
4115 	STAILQ_FOREACH(tc, colors, entry) {
4116 		if (match_line(line, &tc->regex, 0, NULL))
4117 			return tc;
4118 	}
4119 
4120 	return NULL;
4121 }
4122 
4123 static const struct got_error *
4124 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4125     WINDOW *window, int skipcol, regmatch_t *regmatch)
4126 {
4127 	const struct got_error *err = NULL;
4128 	char *exstr = NULL;
4129 	wchar_t *wline = NULL;
4130 	int rme, rms, n, width, scrollx;
4131 	int width0 = 0, width1 = 0, width2 = 0;
4132 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4133 
4134 	*wtotal = 0;
4135 
4136 	rms = regmatch->rm_so;
4137 	rme = regmatch->rm_eo;
4138 
4139 	err = expand_tab(&exstr, line);
4140 	if (err)
4141 		return err;
4142 
4143 	/* Split the line into 3 segments, according to match offsets. */
4144 	seg0 = strndup(exstr, rms);
4145 	if (seg0 == NULL) {
4146 		err = got_error_from_errno("strndup");
4147 		goto done;
4148 	}
4149 	seg1 = strndup(exstr + rms, rme - rms);
4150 	if (seg1 == NULL) {
4151 		err = got_error_from_errno("strndup");
4152 		goto done;
4153 	}
4154 	seg2 = strdup(exstr + rme);
4155 	if (seg2 == NULL) {
4156 		err = got_error_from_errno("strndup");
4157 		goto done;
4158 	}
4159 
4160 	/* draw up to matched token if we haven't scrolled past it */
4161 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4162 	    col_tab_align, 1);
4163 	if (err)
4164 		goto done;
4165 	n = MAX(width0 - skipcol, 0);
4166 	if (n) {
4167 		free(wline);
4168 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4169 		    wlimit, col_tab_align, 1);
4170 		if (err)
4171 			goto done;
4172 		waddwstr(window, &wline[scrollx]);
4173 		wlimit -= width;
4174 		*wtotal += width;
4175 	}
4176 
4177 	if (wlimit > 0) {
4178 		int i = 0, w = 0;
4179 		size_t wlen;
4180 
4181 		free(wline);
4182 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4183 		    col_tab_align, 1);
4184 		if (err)
4185 			goto done;
4186 		wlen = wcslen(wline);
4187 		while (i < wlen) {
4188 			width = wcwidth(wline[i]);
4189 			if (width == -1) {
4190 				/* should not happen, tabs are expanded */
4191 				err = got_error(GOT_ERR_RANGE);
4192 				goto done;
4193 			}
4194 			if (width0 + w + width > skipcol)
4195 				break;
4196 			w += width;
4197 			i++;
4198 		}
4199 		/* draw (visible part of) matched token (if scrolled into it) */
4200 		if (width1 - w > 0) {
4201 			wattron(window, A_STANDOUT);
4202 			waddwstr(window, &wline[i]);
4203 			wattroff(window, A_STANDOUT);
4204 			wlimit -= (width1 - w);
4205 			*wtotal += (width1 - w);
4206 		}
4207 	}
4208 
4209 	if (wlimit > 0) {  /* draw rest of line */
4210 		free(wline);
4211 		if (skipcol > width0 + width1) {
4212 			err = format_line(&wline, &width2, &scrollx, seg2,
4213 			    skipcol - (width0 + width1), wlimit,
4214 			    col_tab_align, 1);
4215 			if (err)
4216 				goto done;
4217 			waddwstr(window, &wline[scrollx]);
4218 		} else {
4219 			err = format_line(&wline, &width2, NULL, seg2, 0,
4220 			    wlimit, col_tab_align, 1);
4221 			if (err)
4222 				goto done;
4223 			waddwstr(window, wline);
4224 		}
4225 		*wtotal += width2;
4226 	}
4227 done:
4228 	free(wline);
4229 	free(exstr);
4230 	free(seg0);
4231 	free(seg1);
4232 	free(seg2);
4233 	return err;
4234 }
4235 
4236 static int
4237 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4238 {
4239 	FILE	*f = NULL;
4240 	int	*eof, *first, *selected;
4241 
4242 	if (view->type == TOG_VIEW_DIFF) {
4243 		struct tog_diff_view_state *s = &view->state.diff;
4244 
4245 		first = &s->first_displayed_line;
4246 		selected = first;
4247 		eof = &s->eof;
4248 		f = s->f;
4249 	} else if (view->type == TOG_VIEW_HELP) {
4250 		struct tog_help_view_state *s = &view->state.help;
4251 
4252 		first = &s->first_displayed_line;
4253 		selected = first;
4254 		eof = &s->eof;
4255 		f = s->f;
4256 	} else if (view->type == TOG_VIEW_BLAME) {
4257 		struct tog_blame_view_state *s = &view->state.blame;
4258 
4259 		first = &s->first_displayed_line;
4260 		selected = &s->selected_line;
4261 		eof = &s->eof;
4262 		f = s->blame.f;
4263 	} else
4264 		return 0;
4265 
4266 	/* Center gline in the middle of the page like vi(1). */
4267 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4268 		return 0;
4269 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4270 		rewind(f);
4271 		*eof = 0;
4272 		*first = 1;
4273 		*lineno = 0;
4274 		*nprinted = 0;
4275 		return 0;
4276 	}
4277 
4278 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4279 		view->gline : (view->nlines - 3) / 2 + 1;
4280 	view->gline = 0;
4281 
4282 	return 1;
4283 }
4284 
4285 static const struct got_error *
4286 draw_file(struct tog_view *view, const char *header)
4287 {
4288 	struct tog_diff_view_state *s = &view->state.diff;
4289 	regmatch_t *regmatch = &view->regmatch;
4290 	const struct got_error *err;
4291 	int nprinted = 0;
4292 	char *line;
4293 	size_t linesize = 0;
4294 	ssize_t linelen;
4295 	wchar_t *wline;
4296 	int width;
4297 	int max_lines = view->nlines;
4298 	int nlines = s->nlines;
4299 	off_t line_offset;
4300 
4301 	s->lineno = s->first_displayed_line - 1;
4302 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4303 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4304 		return got_error_from_errno("fseek");
4305 
4306 	werase(view->window);
4307 
4308 	if (view->gline > s->nlines - 1)
4309 		view->gline = s->nlines - 1;
4310 
4311 	if (header) {
4312 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4313 		    1 : view->gline - (view->nlines - 3) / 2 :
4314 		    s->lineno + s->selected_line;
4315 
4316 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4317 			return got_error_from_errno("asprintf");
4318 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4319 		    0, 0);
4320 		free(line);
4321 		if (err)
4322 			return err;
4323 
4324 		if (view_needs_focus_indication(view))
4325 			wstandout(view->window);
4326 		waddwstr(view->window, wline);
4327 		free(wline);
4328 		wline = NULL;
4329 		while (width++ < view->ncols)
4330 			waddch(view->window, ' ');
4331 		if (view_needs_focus_indication(view))
4332 			wstandend(view->window);
4333 
4334 		if (max_lines <= 1)
4335 			return NULL;
4336 		max_lines--;
4337 	}
4338 
4339 	s->eof = 0;
4340 	view->maxx = 0;
4341 	line = NULL;
4342 	while (max_lines > 0 && nprinted < max_lines) {
4343 		enum got_diff_line_type linetype;
4344 		attr_t attr = 0;
4345 
4346 		linelen = getline(&line, &linesize, s->f);
4347 		if (linelen == -1) {
4348 			if (feof(s->f)) {
4349 				s->eof = 1;
4350 				break;
4351 			}
4352 			free(line);
4353 			return got_ferror(s->f, GOT_ERR_IO);
4354 		}
4355 
4356 		if (++s->lineno < s->first_displayed_line)
4357 			continue;
4358 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4359 			continue;
4360 		if (s->lineno == view->hiline)
4361 			attr = A_STANDOUT;
4362 
4363 		/* Set view->maxx based on full line length. */
4364 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4365 		    view->x ? 1 : 0);
4366 		if (err) {
4367 			free(line);
4368 			return err;
4369 		}
4370 		view->maxx = MAX(view->maxx, width);
4371 		free(wline);
4372 		wline = NULL;
4373 
4374 		linetype = s->lines[s->lineno].type;
4375 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4376 		    linetype < GOT_DIFF_LINE_CONTEXT)
4377 			attr |= COLOR_PAIR(linetype);
4378 		if (attr)
4379 			wattron(view->window, attr);
4380 		if (s->first_displayed_line + nprinted == s->matched_line &&
4381 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4382 			err = add_matched_line(&width, line, view->ncols, 0,
4383 			    view->window, view->x, regmatch);
4384 			if (err) {
4385 				free(line);
4386 				return err;
4387 			}
4388 		} else {
4389 			int skip;
4390 			err = format_line(&wline, &width, &skip, line,
4391 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4392 			if (err) {
4393 				free(line);
4394 				return err;
4395 			}
4396 			waddwstr(view->window, &wline[skip]);
4397 			free(wline);
4398 			wline = NULL;
4399 		}
4400 		if (s->lineno == view->hiline) {
4401 			/* highlight full gline length */
4402 			while (width++ < view->ncols)
4403 				waddch(view->window, ' ');
4404 		} else {
4405 			if (width <= view->ncols - 1)
4406 				waddch(view->window, '\n');
4407 		}
4408 		if (attr)
4409 			wattroff(view->window, attr);
4410 		if (++nprinted == 1)
4411 			s->first_displayed_line = s->lineno;
4412 	}
4413 	free(line);
4414 	if (nprinted >= 1)
4415 		s->last_displayed_line = s->first_displayed_line +
4416 		    (nprinted - 1);
4417 	else
4418 		s->last_displayed_line = s->first_displayed_line;
4419 
4420 	view_border(view);
4421 
4422 	if (s->eof) {
4423 		while (nprinted < view->nlines) {
4424 			waddch(view->window, '\n');
4425 			nprinted++;
4426 		}
4427 
4428 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4429 		    view->ncols, 0, 0);
4430 		if (err) {
4431 			return err;
4432 		}
4433 
4434 		wstandout(view->window);
4435 		waddwstr(view->window, wline);
4436 		free(wline);
4437 		wline = NULL;
4438 		wstandend(view->window);
4439 	}
4440 
4441 	return NULL;
4442 }
4443 
4444 static char *
4445 get_datestr(time_t *time, char *datebuf)
4446 {
4447 	struct tm mytm, *tm;
4448 	char *p, *s;
4449 
4450 	tm = gmtime_r(time, &mytm);
4451 	if (tm == NULL)
4452 		return NULL;
4453 	s = asctime_r(tm, datebuf);
4454 	if (s == NULL)
4455 		return NULL;
4456 	p = strchr(s, '\n');
4457 	if (p)
4458 		*p = '\0';
4459 	return s;
4460 }
4461 
4462 static const struct got_error *
4463 get_changed_paths(struct got_pathlist_head *paths,
4464     struct got_commit_object *commit, struct got_repository *repo,
4465     struct got_diffstat_cb_arg *dsa)
4466 {
4467 	const struct got_error *err = NULL;
4468 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4469 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4470 	struct got_object_qid *qid;
4471 	FILE *f1 = NULL, *f2 = NULL;
4472 	int fd1 = -1, fd2 = -1;
4473 
4474 	f1 = got_opentemp();
4475 	if (f1 == NULL) {
4476 		err = got_error_from_errno("got_opentemp");
4477 		goto done;
4478 	}
4479 	f2 = got_opentemp();
4480 	if (f2 == NULL) {
4481 		err = got_error_from_errno("got_opentemp");
4482 		goto done;
4483 	}
4484 
4485 	fd1 = got_opentempfd();
4486 	if (fd1 == -1) {
4487 		err = got_error_from_errno("got_opentempfd");
4488 		goto done;
4489 	}
4490 	fd2 = got_opentempfd();
4491 	if (fd2 == -1) {
4492 		err = got_error_from_errno("got_opentempfd");
4493 		goto done;
4494 	}
4495 
4496 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4497 	if (qid != NULL) {
4498 		struct got_commit_object *pcommit;
4499 		err = got_object_open_as_commit(&pcommit, repo,
4500 		    &qid->id);
4501 		if (err)
4502 			return err;
4503 
4504 		tree_id1 = got_object_id_dup(
4505 		    got_object_commit_get_tree_id(pcommit));
4506 		if (tree_id1 == NULL) {
4507 			got_object_commit_close(pcommit);
4508 			return got_error_from_errno("got_object_id_dup");
4509 		}
4510 		got_object_commit_close(pcommit);
4511 
4512 	}
4513 
4514 	if (tree_id1) {
4515 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4516 		if (err)
4517 			goto done;
4518 	}
4519 
4520 	tree_id2 = got_object_commit_get_tree_id(commit);
4521 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4522 	if (err)
4523 		goto done;
4524 
4525 	err = got_diff_tree(tree1, tree2, f1, f2, fd1, fd2, "", "", repo,
4526 	    got_diff_tree_compute_diffstat, dsa, 1);
4527 done:
4528 	if (tree1)
4529 		got_object_tree_close(tree1);
4530 	if (tree2)
4531 		got_object_tree_close(tree2);
4532 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
4533 		err = got_error_from_errno("close");
4534 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
4535 		err = got_error_from_errno("close");
4536 	if (f1 && fclose(f1) == EOF && err == NULL)
4537 		err = got_error_from_errno("fclose");
4538 	if (f2 && fclose(f2) == EOF && err == NULL)
4539 		err = got_error_from_errno("fclose");
4540 	free(tree_id1);
4541 	return err;
4542 }
4543 
4544 static const struct got_error *
4545 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4546     off_t off, uint8_t type)
4547 {
4548 	struct got_diff_line *p;
4549 
4550 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4551 	if (p == NULL)
4552 		return got_error_from_errno("reallocarray");
4553 	*lines = p;
4554 	(*lines)[*nlines].offset = off;
4555 	(*lines)[*nlines].type = type;
4556 	(*nlines)++;
4557 
4558 	return NULL;
4559 }
4560 
4561 static const struct got_error *
4562 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4563     struct got_object_id *commit_id, struct got_reflist_head *refs,
4564     struct got_repository *repo, int ignore_ws, int force_text_diff,
4565     FILE *outfile)
4566 {
4567 	const struct got_error *err = NULL;
4568 	char datebuf[26], *datestr;
4569 	struct got_commit_object *commit;
4570 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4571 	time_t committer_time;
4572 	const char *author, *committer;
4573 	char *refs_str = NULL;
4574 	struct got_pathlist_head changed_paths;
4575 	struct got_pathlist_entry *pe;
4576 	struct got_diffstat_cb_arg dsa = { 0, 0, 0, 0, 0, 0, &changed_paths,
4577 	    ignore_ws, force_text_diff, tog_diff_algo };
4578 	off_t outoff = 0;
4579 	int n;
4580 
4581 	TAILQ_INIT(&changed_paths);
4582 
4583 	if (refs) {
4584 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4585 		if (err)
4586 			return err;
4587 	}
4588 
4589 	err = got_object_open_as_commit(&commit, repo, commit_id);
4590 	if (err)
4591 		return err;
4592 
4593 	err = got_object_id_str(&id_str, commit_id);
4594 	if (err) {
4595 		err = got_error_from_errno("got_object_id_str");
4596 		goto done;
4597 	}
4598 
4599 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4600 	if (err)
4601 		goto done;
4602 
4603 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4604 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4605 	if (n < 0) {
4606 		err = got_error_from_errno("fprintf");
4607 		goto done;
4608 	}
4609 	outoff += n;
4610 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4611 	if (err)
4612 		goto done;
4613 
4614 	n = fprintf(outfile, "from: %s\n",
4615 	    got_object_commit_get_author(commit));
4616 	if (n < 0) {
4617 		err = got_error_from_errno("fprintf");
4618 		goto done;
4619 	}
4620 	outoff += n;
4621 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4622 	if (err)
4623 		goto done;
4624 
4625 	author = got_object_commit_get_author(commit);
4626 	committer = got_object_commit_get_committer(commit);
4627 	if (strcmp(author, committer) != 0) {
4628 		n = fprintf(outfile, "via: %s\n", committer);
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_AUTHOR);
4636 		if (err)
4637 			goto done;
4638 	}
4639 	committer_time = got_object_commit_get_committer_time(commit);
4640 	datestr = get_datestr(&committer_time, datebuf);
4641 	if (datestr) {
4642 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4643 		if (n < 0) {
4644 			err = got_error_from_errno("fprintf");
4645 			goto done;
4646 		}
4647 		outoff += n;
4648 		err = add_line_metadata(lines, nlines, outoff,
4649 		    GOT_DIFF_LINE_DATE);
4650 		if (err)
4651 			goto done;
4652 	}
4653 	if (got_object_commit_get_nparents(commit) > 1) {
4654 		const struct got_object_id_queue *parent_ids;
4655 		struct got_object_qid *qid;
4656 		int pn = 1;
4657 		parent_ids = got_object_commit_get_parent_ids(commit);
4658 		STAILQ_FOREACH(qid, parent_ids, entry) {
4659 			err = got_object_id_str(&id_str, &qid->id);
4660 			if (err)
4661 				goto done;
4662 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4663 			if (n < 0) {
4664 				err = got_error_from_errno("fprintf");
4665 				goto done;
4666 			}
4667 			outoff += n;
4668 			err = add_line_metadata(lines, nlines, outoff,
4669 			    GOT_DIFF_LINE_META);
4670 			if (err)
4671 				goto done;
4672 			free(id_str);
4673 			id_str = NULL;
4674 		}
4675 	}
4676 
4677 	err = got_object_commit_get_logmsg(&logmsg, commit);
4678 	if (err)
4679 		goto done;
4680 	s = logmsg;
4681 	while ((line = strsep(&s, "\n")) != NULL) {
4682 		n = fprintf(outfile, "%s\n", line);
4683 		if (n < 0) {
4684 			err = got_error_from_errno("fprintf");
4685 			goto done;
4686 		}
4687 		outoff += n;
4688 		err = add_line_metadata(lines, nlines, outoff,
4689 		    GOT_DIFF_LINE_LOGMSG);
4690 		if (err)
4691 			goto done;
4692 	}
4693 
4694 	err = get_changed_paths(&changed_paths, commit, repo, &dsa);
4695 	if (err)
4696 		goto done;
4697 
4698 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4699 		struct got_diff_changed_path *cp = pe->data;
4700 		int pad = dsa.max_path_len - pe->path_len + 1;
4701 
4702 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4703 		    pe->path, pad, ' ', dsa.add_cols + 1, cp->add,
4704 		    dsa.rm_cols + 1, cp->rm);
4705 		if (n < 0) {
4706 			err = got_error_from_errno("fprintf");
4707 			goto done;
4708 		}
4709 		outoff += n;
4710 		err = add_line_metadata(lines, nlines, outoff,
4711 		    GOT_DIFF_LINE_CHANGES);
4712 		if (err)
4713 			goto done;
4714 	}
4715 
4716 	fputc('\n', outfile);
4717 	outoff++;
4718 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4719 	if (err)
4720 		goto done;
4721 
4722 	n = fprintf(outfile,
4723 	    "%d file%s changed, %d insertions(+), %d deletions(-)\n",
4724 	    dsa.nfiles, dsa.nfiles > 1 ? "s" : "", dsa.ins, dsa.del);
4725 	if (n < 0) {
4726 		err = got_error_from_errno("fprintf");
4727 		goto done;
4728 	}
4729 	outoff += n;
4730 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4731 	if (err)
4732 		goto done;
4733 
4734 	fputc('\n', outfile);
4735 	outoff++;
4736 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4737 done:
4738 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4739 	free(id_str);
4740 	free(logmsg);
4741 	free(refs_str);
4742 	got_object_commit_close(commit);
4743 	if (err) {
4744 		free(*lines);
4745 		*lines = NULL;
4746 		*nlines = 0;
4747 	}
4748 	return err;
4749 }
4750 
4751 static const struct got_error *
4752 create_diff(struct tog_diff_view_state *s)
4753 {
4754 	const struct got_error *err = NULL;
4755 	FILE *f = NULL;
4756 	int obj_type;
4757 
4758 	free(s->lines);
4759 	s->lines = malloc(sizeof(*s->lines));
4760 	if (s->lines == NULL)
4761 		return got_error_from_errno("malloc");
4762 	s->nlines = 0;
4763 
4764 	f = got_opentemp();
4765 	if (f == NULL) {
4766 		err = got_error_from_errno("got_opentemp");
4767 		goto done;
4768 	}
4769 	if (s->f && fclose(s->f) == EOF) {
4770 		err = got_error_from_errno("fclose");
4771 		goto done;
4772 	}
4773 	s->f = f;
4774 
4775 	if (s->id1)
4776 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4777 	else
4778 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4779 	if (err)
4780 		goto done;
4781 
4782 	switch (obj_type) {
4783 	case GOT_OBJ_TYPE_BLOB:
4784 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4785 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4786 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4787 		    s->ignore_whitespace, s->force_text_diff, 0, NULL, s->repo,
4788 		    s->f);
4789 		break;
4790 	case GOT_OBJ_TYPE_TREE:
4791 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4792 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4793 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4794 		    s->force_text_diff, 0, NULL, s->repo, s->f);
4795 		break;
4796 	case GOT_OBJ_TYPE_COMMIT: {
4797 		const struct got_object_id_queue *parent_ids;
4798 		struct got_object_qid *pid;
4799 		struct got_commit_object *commit2;
4800 		struct got_reflist_head *refs;
4801 
4802 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4803 		if (err)
4804 			goto done;
4805 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4806 		/* Show commit info if we're diffing to a parent/root commit. */
4807 		if (s->id1 == NULL) {
4808 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4809 			    refs, s->repo, s->ignore_whitespace,
4810 			    s->force_text_diff, s->f);
4811 			if (err)
4812 				goto done;
4813 		} else {
4814 			parent_ids = got_object_commit_get_parent_ids(commit2);
4815 			STAILQ_FOREACH(pid, parent_ids, entry) {
4816 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4817 					err = write_commit_info(&s->lines,
4818 					    &s->nlines, s->id2, refs, s->repo,
4819 					    s->ignore_whitespace,
4820 					    s->force_text_diff, s->f);
4821 					if (err)
4822 						goto done;
4823 					break;
4824 				}
4825 			}
4826 		}
4827 		got_object_commit_close(commit2);
4828 
4829 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4830 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4831 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4832 		    s->force_text_diff, 0, NULL, s->repo, s->f);
4833 		break;
4834 	}
4835 	default:
4836 		err = got_error(GOT_ERR_OBJ_TYPE);
4837 		break;
4838 	}
4839 done:
4840 	if (s->f && fflush(s->f) != 0 && err == NULL)
4841 		err = got_error_from_errno("fflush");
4842 	return err;
4843 }
4844 
4845 static void
4846 diff_view_indicate_progress(struct tog_view *view)
4847 {
4848 	mvwaddstr(view->window, 0, 0, "diffing...");
4849 	update_panels();
4850 	doupdate();
4851 }
4852 
4853 static const struct got_error *
4854 search_start_diff_view(struct tog_view *view)
4855 {
4856 	struct tog_diff_view_state *s = &view->state.diff;
4857 
4858 	s->matched_line = 0;
4859 	return NULL;
4860 }
4861 
4862 static void
4863 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4864     size_t *nlines, int **first, int **last, int **match, int **selected)
4865 {
4866 	struct tog_diff_view_state *s = &view->state.diff;
4867 
4868 	*f = s->f;
4869 	*nlines = s->nlines;
4870 	*line_offsets = NULL;
4871 	*match = &s->matched_line;
4872 	*first = &s->first_displayed_line;
4873 	*last = &s->last_displayed_line;
4874 	*selected = &s->selected_line;
4875 }
4876 
4877 static const struct got_error *
4878 search_next_view_match(struct tog_view *view)
4879 {
4880 	const struct got_error *err = NULL;
4881 	FILE *f;
4882 	int lineno;
4883 	char *line = NULL;
4884 	size_t linesize = 0;
4885 	ssize_t linelen;
4886 	off_t *line_offsets;
4887 	size_t nlines = 0;
4888 	int *first, *last, *match, *selected;
4889 
4890 	if (!view->search_setup)
4891 		return got_error_msg(GOT_ERR_NOT_IMPL,
4892 		    "view search not supported");
4893 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4894 	    &match, &selected);
4895 
4896 	if (!view->searching) {
4897 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4898 		return NULL;
4899 	}
4900 
4901 	if (*match) {
4902 		if (view->searching == TOG_SEARCH_FORWARD)
4903 			lineno = *match + 1;
4904 		else
4905 			lineno = *match - 1;
4906 	} else
4907 		lineno = *first - 1 + *selected;
4908 
4909 	while (1) {
4910 		off_t offset;
4911 
4912 		if (lineno <= 0 || lineno > nlines) {
4913 			if (*match == 0) {
4914 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4915 				break;
4916 			}
4917 
4918 			if (view->searching == TOG_SEARCH_FORWARD)
4919 				lineno = 1;
4920 			else
4921 				lineno = nlines;
4922 		}
4923 
4924 		offset = view->type == TOG_VIEW_DIFF ?
4925 		    view->state.diff.lines[lineno - 1].offset :
4926 		    line_offsets[lineno - 1];
4927 		if (fseeko(f, offset, SEEK_SET) != 0) {
4928 			free(line);
4929 			return got_error_from_errno("fseeko");
4930 		}
4931 		linelen = getline(&line, &linesize, f);
4932 		if (linelen != -1) {
4933 			char *exstr;
4934 			err = expand_tab(&exstr, line);
4935 			if (err)
4936 				break;
4937 			if (match_line(exstr, &view->regex, 1,
4938 			    &view->regmatch)) {
4939 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4940 				*match = lineno;
4941 				free(exstr);
4942 				break;
4943 			}
4944 			free(exstr);
4945 		}
4946 		if (view->searching == TOG_SEARCH_FORWARD)
4947 			lineno++;
4948 		else
4949 			lineno--;
4950 	}
4951 	free(line);
4952 
4953 	if (*match) {
4954 		*first = *match;
4955 		*selected = 1;
4956 	}
4957 
4958 	return err;
4959 }
4960 
4961 static const struct got_error *
4962 close_diff_view(struct tog_view *view)
4963 {
4964 	const struct got_error *err = NULL;
4965 	struct tog_diff_view_state *s = &view->state.diff;
4966 
4967 	free(s->id1);
4968 	s->id1 = NULL;
4969 	free(s->id2);
4970 	s->id2 = NULL;
4971 	if (s->f && fclose(s->f) == EOF)
4972 		err = got_error_from_errno("fclose");
4973 	s->f = NULL;
4974 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4975 		err = got_error_from_errno("fclose");
4976 	s->f1 = NULL;
4977 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4978 		err = got_error_from_errno("fclose");
4979 	s->f2 = NULL;
4980 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4981 		err = got_error_from_errno("close");
4982 	s->fd1 = -1;
4983 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4984 		err = got_error_from_errno("close");
4985 	s->fd2 = -1;
4986 	free(s->lines);
4987 	s->lines = NULL;
4988 	s->nlines = 0;
4989 	return err;
4990 }
4991 
4992 static const struct got_error *
4993 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4994     struct got_object_id *id2, const char *label1, const char *label2,
4995     int diff_context, int ignore_whitespace, int force_text_diff,
4996     struct tog_view *parent_view, struct got_repository *repo)
4997 {
4998 	const struct got_error *err;
4999 	struct tog_diff_view_state *s = &view->state.diff;
5000 
5001 	memset(s, 0, sizeof(*s));
5002 	s->fd1 = -1;
5003 	s->fd2 = -1;
5004 
5005 	if (id1 != NULL && id2 != NULL) {
5006 	    int type1, type2;
5007 	    err = got_object_get_type(&type1, repo, id1);
5008 	    if (err)
5009 		return err;
5010 	    err = got_object_get_type(&type2, repo, id2);
5011 	    if (err)
5012 		return err;
5013 
5014 	    if (type1 != type2)
5015 		return got_error(GOT_ERR_OBJ_TYPE);
5016 	}
5017 	s->first_displayed_line = 1;
5018 	s->last_displayed_line = view->nlines;
5019 	s->selected_line = 1;
5020 	s->repo = repo;
5021 	s->id1 = id1;
5022 	s->id2 = id2;
5023 	s->label1 = label1;
5024 	s->label2 = label2;
5025 
5026 	if (id1) {
5027 		s->id1 = got_object_id_dup(id1);
5028 		if (s->id1 == NULL)
5029 			return got_error_from_errno("got_object_id_dup");
5030 	} else
5031 		s->id1 = NULL;
5032 
5033 	s->id2 = got_object_id_dup(id2);
5034 	if (s->id2 == NULL) {
5035 		err = got_error_from_errno("got_object_id_dup");
5036 		goto done;
5037 	}
5038 
5039 	s->f1 = got_opentemp();
5040 	if (s->f1 == NULL) {
5041 		err = got_error_from_errno("got_opentemp");
5042 		goto done;
5043 	}
5044 
5045 	s->f2 = got_opentemp();
5046 	if (s->f2 == NULL) {
5047 		err = got_error_from_errno("got_opentemp");
5048 		goto done;
5049 	}
5050 
5051 	s->fd1 = got_opentempfd();
5052 	if (s->fd1 == -1) {
5053 		err = got_error_from_errno("got_opentempfd");
5054 		goto done;
5055 	}
5056 
5057 	s->fd2 = got_opentempfd();
5058 	if (s->fd2 == -1) {
5059 		err = got_error_from_errno("got_opentempfd");
5060 		goto done;
5061 	}
5062 
5063 	s->diff_context = diff_context;
5064 	s->ignore_whitespace = ignore_whitespace;
5065 	s->force_text_diff = force_text_diff;
5066 	s->parent_view = parent_view;
5067 	s->repo = repo;
5068 
5069 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5070 		int rc;
5071 
5072 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5073 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5074 		if (rc != ERR)
5075 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5076 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5077 		if (rc != ERR)
5078 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5079 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5080 		if (rc != ERR)
5081 			rc = init_pair(GOT_DIFF_LINE_META,
5082 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5083 		if (rc != ERR)
5084 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5085 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5086 		if (rc != ERR)
5087 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5088 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5089 		if (rc != ERR)
5090 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5091 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5092 		if (rc != ERR)
5093 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5094 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5095 		if (rc != ERR)
5096 			rc = init_pair(GOT_DIFF_LINE_DATE,
5097 			    get_color_value("TOG_COLOR_DATE"), -1);
5098 		if (rc == ERR) {
5099 			err = got_error(GOT_ERR_RANGE);
5100 			goto done;
5101 		}
5102 	}
5103 
5104 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5105 	    view_is_splitscreen(view))
5106 		show_log_view(parent_view); /* draw border */
5107 	diff_view_indicate_progress(view);
5108 
5109 	err = create_diff(s);
5110 
5111 	view->show = show_diff_view;
5112 	view->input = input_diff_view;
5113 	view->reset = reset_diff_view;
5114 	view->close = close_diff_view;
5115 	view->search_start = search_start_diff_view;
5116 	view->search_setup = search_setup_diff_view;
5117 	view->search_next = search_next_view_match;
5118 done:
5119 	if (err)
5120 		close_diff_view(view);
5121 	return err;
5122 }
5123 
5124 static const struct got_error *
5125 show_diff_view(struct tog_view *view)
5126 {
5127 	const struct got_error *err;
5128 	struct tog_diff_view_state *s = &view->state.diff;
5129 	char *id_str1 = NULL, *id_str2, *header;
5130 	const char *label1, *label2;
5131 
5132 	if (s->id1) {
5133 		err = got_object_id_str(&id_str1, s->id1);
5134 		if (err)
5135 			return err;
5136 		label1 = s->label1 ? s->label1 : id_str1;
5137 	} else
5138 		label1 = "/dev/null";
5139 
5140 	err = got_object_id_str(&id_str2, s->id2);
5141 	if (err)
5142 		return err;
5143 	label2 = s->label2 ? s->label2 : id_str2;
5144 
5145 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5146 		err = got_error_from_errno("asprintf");
5147 		free(id_str1);
5148 		free(id_str2);
5149 		return err;
5150 	}
5151 	free(id_str1);
5152 	free(id_str2);
5153 
5154 	err = draw_file(view, header);
5155 	free(header);
5156 	return err;
5157 }
5158 
5159 static const struct got_error *
5160 set_selected_commit(struct tog_diff_view_state *s,
5161     struct commit_queue_entry *entry)
5162 {
5163 	const struct got_error *err;
5164 	const struct got_object_id_queue *parent_ids;
5165 	struct got_commit_object *selected_commit;
5166 	struct got_object_qid *pid;
5167 
5168 	free(s->id2);
5169 	s->id2 = got_object_id_dup(entry->id);
5170 	if (s->id2 == NULL)
5171 		return got_error_from_errno("got_object_id_dup");
5172 
5173 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5174 	if (err)
5175 		return err;
5176 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5177 	free(s->id1);
5178 	pid = STAILQ_FIRST(parent_ids);
5179 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5180 	got_object_commit_close(selected_commit);
5181 	return NULL;
5182 }
5183 
5184 static const struct got_error *
5185 reset_diff_view(struct tog_view *view)
5186 {
5187 	struct tog_diff_view_state *s = &view->state.diff;
5188 
5189 	view->count = 0;
5190 	wclear(view->window);
5191 	s->first_displayed_line = 1;
5192 	s->last_displayed_line = view->nlines;
5193 	s->matched_line = 0;
5194 	diff_view_indicate_progress(view);
5195 	return create_diff(s);
5196 }
5197 
5198 static void
5199 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5200 {
5201 	int start, i;
5202 
5203 	i = start = s->first_displayed_line - 1;
5204 
5205 	while (s->lines[i].type != type) {
5206 		if (i == 0)
5207 			i = s->nlines - 1;
5208 		if (--i == start)
5209 			return; /* do nothing, requested type not in file */
5210 	}
5211 
5212 	s->selected_line = 1;
5213 	s->first_displayed_line = i;
5214 }
5215 
5216 static void
5217 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5218 {
5219 	int start, i;
5220 
5221 	i = start = s->first_displayed_line + 1;
5222 
5223 	while (s->lines[i].type != type) {
5224 		if (i == s->nlines - 1)
5225 			i = 0;
5226 		if (++i == start)
5227 			return; /* do nothing, requested type not in file */
5228 	}
5229 
5230 	s->selected_line = 1;
5231 	s->first_displayed_line = i;
5232 }
5233 
5234 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5235     int, int, int);
5236 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5237     int, int);
5238 
5239 static const struct got_error *
5240 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5241 {
5242 	const struct got_error *err = NULL;
5243 	struct tog_diff_view_state *s = &view->state.diff;
5244 	struct tog_log_view_state *ls;
5245 	struct commit_queue_entry *old_selected_entry;
5246 	char *line = NULL;
5247 	size_t linesize = 0;
5248 	ssize_t linelen;
5249 	int i, nscroll = view->nlines - 1, up = 0;
5250 
5251 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5252 
5253 	switch (ch) {
5254 	case '0':
5255 		view->x = 0;
5256 		break;
5257 	case '$':
5258 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5259 		view->count = 0;
5260 		break;
5261 	case KEY_RIGHT:
5262 	case 'l':
5263 		if (view->x + view->ncols / 3 < view->maxx)
5264 			view->x += 2;  /* move two columns right */
5265 		else
5266 			view->count = 0;
5267 		break;
5268 	case KEY_LEFT:
5269 	case 'h':
5270 		view->x -= MIN(view->x, 2);  /* move two columns back */
5271 		if (view->x <= 0)
5272 			view->count = 0;
5273 		break;
5274 	case 'a':
5275 	case 'w':
5276 		if (ch == 'a')
5277 			s->force_text_diff = !s->force_text_diff;
5278 		else if (ch == 'w')
5279 			s->ignore_whitespace = !s->ignore_whitespace;
5280 		err = reset_diff_view(view);
5281 		break;
5282 	case 'g':
5283 	case KEY_HOME:
5284 		s->first_displayed_line = 1;
5285 		view->count = 0;
5286 		break;
5287 	case 'G':
5288 	case KEY_END:
5289 		view->count = 0;
5290 		if (s->eof)
5291 			break;
5292 
5293 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5294 		s->eof = 1;
5295 		break;
5296 	case 'k':
5297 	case KEY_UP:
5298 	case CTRL('p'):
5299 		if (s->first_displayed_line > 1)
5300 			s->first_displayed_line--;
5301 		else
5302 			view->count = 0;
5303 		break;
5304 	case CTRL('u'):
5305 	case 'u':
5306 		nscroll /= 2;
5307 		/* FALL THROUGH */
5308 	case KEY_PPAGE:
5309 	case CTRL('b'):
5310 	case 'b':
5311 		if (s->first_displayed_line == 1) {
5312 			view->count = 0;
5313 			break;
5314 		}
5315 		i = 0;
5316 		while (i++ < nscroll && s->first_displayed_line > 1)
5317 			s->first_displayed_line--;
5318 		break;
5319 	case 'j':
5320 	case KEY_DOWN:
5321 	case CTRL('n'):
5322 		if (!s->eof)
5323 			s->first_displayed_line++;
5324 		else
5325 			view->count = 0;
5326 		break;
5327 	case CTRL('d'):
5328 	case 'd':
5329 		nscroll /= 2;
5330 		/* FALL THROUGH */
5331 	case KEY_NPAGE:
5332 	case CTRL('f'):
5333 	case 'f':
5334 	case ' ':
5335 		if (s->eof) {
5336 			view->count = 0;
5337 			break;
5338 		}
5339 		i = 0;
5340 		while (!s->eof && i++ < nscroll) {
5341 			linelen = getline(&line, &linesize, s->f);
5342 			s->first_displayed_line++;
5343 			if (linelen == -1) {
5344 				if (feof(s->f)) {
5345 					s->eof = 1;
5346 				} else
5347 					err = got_ferror(s->f, GOT_ERR_IO);
5348 				break;
5349 			}
5350 		}
5351 		free(line);
5352 		break;
5353 	case '(':
5354 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5355 		break;
5356 	case ')':
5357 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5358 		break;
5359 	case '{':
5360 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5361 		break;
5362 	case '}':
5363 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5364 		break;
5365 	case '[':
5366 		if (s->diff_context > 0) {
5367 			s->diff_context--;
5368 			s->matched_line = 0;
5369 			diff_view_indicate_progress(view);
5370 			err = create_diff(s);
5371 			if (s->first_displayed_line + view->nlines - 1 >
5372 			    s->nlines) {
5373 				s->first_displayed_line = 1;
5374 				s->last_displayed_line = view->nlines;
5375 			}
5376 		} else
5377 			view->count = 0;
5378 		break;
5379 	case ']':
5380 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5381 			s->diff_context++;
5382 			s->matched_line = 0;
5383 			diff_view_indicate_progress(view);
5384 			err = create_diff(s);
5385 		} else
5386 			view->count = 0;
5387 		break;
5388 	case '<':
5389 	case ',':
5390 	case 'K':
5391 		up = 1;
5392 		/* FALL THROUGH */
5393 	case '>':
5394 	case '.':
5395 	case 'J':
5396 		if (s->parent_view == NULL) {
5397 			view->count = 0;
5398 			break;
5399 		}
5400 		s->parent_view->count = view->count;
5401 
5402 		if (s->parent_view->type == TOG_VIEW_LOG) {
5403 			ls = &s->parent_view->state.log;
5404 			old_selected_entry = ls->selected_entry;
5405 
5406 			err = input_log_view(NULL, s->parent_view,
5407 			    up ? KEY_UP : KEY_DOWN);
5408 			if (err)
5409 				break;
5410 			view->count = s->parent_view->count;
5411 
5412 			if (old_selected_entry == ls->selected_entry)
5413 				break;
5414 
5415 			err = set_selected_commit(s, ls->selected_entry);
5416 			if (err)
5417 				break;
5418 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5419 			struct tog_blame_view_state *bs;
5420 			struct got_object_id *id, *prev_id;
5421 
5422 			bs = &s->parent_view->state.blame;
5423 			prev_id = get_annotation_for_line(bs->blame.lines,
5424 			    bs->blame.nlines, bs->last_diffed_line);
5425 
5426 			err = input_blame_view(&view, s->parent_view,
5427 			    up ? KEY_UP : KEY_DOWN);
5428 			if (err)
5429 				break;
5430 			view->count = s->parent_view->count;
5431 
5432 			if (prev_id == NULL)
5433 				break;
5434 			id = get_selected_commit_id(bs->blame.lines,
5435 			    bs->blame.nlines, bs->first_displayed_line,
5436 			    bs->selected_line);
5437 			if (id == NULL)
5438 				break;
5439 
5440 			if (!got_object_id_cmp(prev_id, id))
5441 				break;
5442 
5443 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5444 			if (err)
5445 				break;
5446 		}
5447 		s->first_displayed_line = 1;
5448 		s->last_displayed_line = view->nlines;
5449 		s->matched_line = 0;
5450 		view->x = 0;
5451 
5452 		diff_view_indicate_progress(view);
5453 		err = create_diff(s);
5454 		break;
5455 	default:
5456 		view->count = 0;
5457 		break;
5458 	}
5459 
5460 	return err;
5461 }
5462 
5463 static const struct got_error *
5464 cmd_diff(int argc, char *argv[])
5465 {
5466 	const struct got_error *error = NULL;
5467 	struct got_repository *repo = NULL;
5468 	struct got_worktree *worktree = NULL;
5469 	struct got_object_id *id1 = NULL, *id2 = NULL;
5470 	char *repo_path = NULL, *cwd = NULL;
5471 	char *id_str1 = NULL, *id_str2 = NULL;
5472 	char *label1 = NULL, *label2 = NULL;
5473 	int diff_context = 3, ignore_whitespace = 0;
5474 	int ch, force_text_diff = 0;
5475 	const char *errstr;
5476 	struct tog_view *view;
5477 	int *pack_fds = NULL;
5478 
5479 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5480 		switch (ch) {
5481 		case 'a':
5482 			force_text_diff = 1;
5483 			break;
5484 		case 'C':
5485 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5486 			    &errstr);
5487 			if (errstr != NULL)
5488 				errx(1, "number of context lines is %s: %s",
5489 				    errstr, errstr);
5490 			break;
5491 		case 'r':
5492 			repo_path = realpath(optarg, NULL);
5493 			if (repo_path == NULL)
5494 				return got_error_from_errno2("realpath",
5495 				    optarg);
5496 			got_path_strip_trailing_slashes(repo_path);
5497 			break;
5498 		case 'w':
5499 			ignore_whitespace = 1;
5500 			break;
5501 		default:
5502 			usage_diff();
5503 			/* NOTREACHED */
5504 		}
5505 	}
5506 
5507 	argc -= optind;
5508 	argv += optind;
5509 
5510 	if (argc == 0) {
5511 		usage_diff(); /* TODO show local worktree changes */
5512 	} else if (argc == 2) {
5513 		id_str1 = argv[0];
5514 		id_str2 = argv[1];
5515 	} else
5516 		usage_diff();
5517 
5518 	error = got_repo_pack_fds_open(&pack_fds);
5519 	if (error)
5520 		goto done;
5521 
5522 	if (repo_path == NULL) {
5523 		cwd = getcwd(NULL, 0);
5524 		if (cwd == NULL)
5525 			return got_error_from_errno("getcwd");
5526 		error = got_worktree_open(&worktree, cwd);
5527 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5528 			goto done;
5529 		if (worktree)
5530 			repo_path =
5531 			    strdup(got_worktree_get_repo_path(worktree));
5532 		else
5533 			repo_path = strdup(cwd);
5534 		if (repo_path == NULL) {
5535 			error = got_error_from_errno("strdup");
5536 			goto done;
5537 		}
5538 	}
5539 
5540 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5541 	if (error)
5542 		goto done;
5543 
5544 	init_curses();
5545 
5546 	error = apply_unveil(got_repo_get_path(repo), NULL);
5547 	if (error)
5548 		goto done;
5549 
5550 	error = tog_load_refs(repo, 0);
5551 	if (error)
5552 		goto done;
5553 
5554 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5555 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5556 	if (error)
5557 		goto done;
5558 
5559 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5560 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5561 	if (error)
5562 		goto done;
5563 
5564 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5565 	if (view == NULL) {
5566 		error = got_error_from_errno("view_open");
5567 		goto done;
5568 	}
5569 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5570 	    ignore_whitespace, force_text_diff, NULL,  repo);
5571 	if (error)
5572 		goto done;
5573 	error = view_loop(view);
5574 done:
5575 	free(label1);
5576 	free(label2);
5577 	free(repo_path);
5578 	free(cwd);
5579 	if (repo) {
5580 		const struct got_error *close_err = got_repo_close(repo);
5581 		if (error == NULL)
5582 			error = close_err;
5583 	}
5584 	if (worktree)
5585 		got_worktree_close(worktree);
5586 	if (pack_fds) {
5587 		const struct got_error *pack_err =
5588 		    got_repo_pack_fds_close(pack_fds);
5589 		if (error == NULL)
5590 			error = pack_err;
5591 	}
5592 	tog_free_refs();
5593 	return error;
5594 }
5595 
5596 __dead static void
5597 usage_blame(void)
5598 {
5599 	endwin();
5600 	fprintf(stderr,
5601 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5602 	    getprogname());
5603 	exit(1);
5604 }
5605 
5606 struct tog_blame_line {
5607 	int annotated;
5608 	struct got_object_id *id;
5609 };
5610 
5611 static const struct got_error *
5612 draw_blame(struct tog_view *view)
5613 {
5614 	struct tog_blame_view_state *s = &view->state.blame;
5615 	struct tog_blame *blame = &s->blame;
5616 	regmatch_t *regmatch = &view->regmatch;
5617 	const struct got_error *err;
5618 	int lineno = 0, nprinted = 0;
5619 	char *line = NULL;
5620 	size_t linesize = 0;
5621 	ssize_t linelen;
5622 	wchar_t *wline;
5623 	int width;
5624 	struct tog_blame_line *blame_line;
5625 	struct got_object_id *prev_id = NULL;
5626 	char *id_str;
5627 	struct tog_color *tc;
5628 
5629 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5630 	if (err)
5631 		return err;
5632 
5633 	rewind(blame->f);
5634 	werase(view->window);
5635 
5636 	if (asprintf(&line, "commit %s", id_str) == -1) {
5637 		err = got_error_from_errno("asprintf");
5638 		free(id_str);
5639 		return err;
5640 	}
5641 
5642 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5643 	free(line);
5644 	line = NULL;
5645 	if (err)
5646 		return err;
5647 	if (view_needs_focus_indication(view))
5648 		wstandout(view->window);
5649 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5650 	if (tc)
5651 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5652 	waddwstr(view->window, wline);
5653 	while (width++ < view->ncols)
5654 		waddch(view->window, ' ');
5655 	if (tc)
5656 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5657 	if (view_needs_focus_indication(view))
5658 		wstandend(view->window);
5659 	free(wline);
5660 	wline = NULL;
5661 
5662 	if (view->gline > blame->nlines)
5663 		view->gline = blame->nlines;
5664 
5665 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5666 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5667 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5668 		free(id_str);
5669 		return got_error_from_errno("asprintf");
5670 	}
5671 	free(id_str);
5672 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5673 	free(line);
5674 	line = NULL;
5675 	if (err)
5676 		return err;
5677 	waddwstr(view->window, wline);
5678 	free(wline);
5679 	wline = NULL;
5680 	if (width < view->ncols - 1)
5681 		waddch(view->window, '\n');
5682 
5683 	s->eof = 0;
5684 	view->maxx = 0;
5685 	while (nprinted < view->nlines - 2) {
5686 		linelen = getline(&line, &linesize, blame->f);
5687 		if (linelen == -1) {
5688 			if (feof(blame->f)) {
5689 				s->eof = 1;
5690 				break;
5691 			}
5692 			free(line);
5693 			return got_ferror(blame->f, GOT_ERR_IO);
5694 		}
5695 		if (++lineno < s->first_displayed_line)
5696 			continue;
5697 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5698 			continue;
5699 
5700 		/* Set view->maxx based on full line length. */
5701 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5702 		if (err) {
5703 			free(line);
5704 			return err;
5705 		}
5706 		free(wline);
5707 		wline = NULL;
5708 		view->maxx = MAX(view->maxx, width);
5709 
5710 		if (nprinted == s->selected_line - 1)
5711 			wstandout(view->window);
5712 
5713 		if (blame->nlines > 0) {
5714 			blame_line = &blame->lines[lineno - 1];
5715 			if (blame_line->annotated && prev_id &&
5716 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5717 			    !(nprinted == s->selected_line - 1)) {
5718 				waddstr(view->window, "        ");
5719 			} else if (blame_line->annotated) {
5720 				char *id_str;
5721 				err = got_object_id_str(&id_str,
5722 				    blame_line->id);
5723 				if (err) {
5724 					free(line);
5725 					return err;
5726 				}
5727 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5728 				if (tc)
5729 					wattr_on(view->window,
5730 					    COLOR_PAIR(tc->colorpair), NULL);
5731 				wprintw(view->window, "%.8s", id_str);
5732 				if (tc)
5733 					wattr_off(view->window,
5734 					    COLOR_PAIR(tc->colorpair), NULL);
5735 				free(id_str);
5736 				prev_id = blame_line->id;
5737 			} else {
5738 				waddstr(view->window, "........");
5739 				prev_id = NULL;
5740 			}
5741 		} else {
5742 			waddstr(view->window, "........");
5743 			prev_id = NULL;
5744 		}
5745 
5746 		if (nprinted == s->selected_line - 1)
5747 			wstandend(view->window);
5748 		waddstr(view->window, " ");
5749 
5750 		if (view->ncols <= 9) {
5751 			width = 9;
5752 		} else if (s->first_displayed_line + nprinted ==
5753 		    s->matched_line &&
5754 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5755 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5756 			    view->window, view->x, regmatch);
5757 			if (err) {
5758 				free(line);
5759 				return err;
5760 			}
5761 			width += 9;
5762 		} else {
5763 			int skip;
5764 			err = format_line(&wline, &width, &skip, line,
5765 			    view->x, view->ncols - 9, 9, 1);
5766 			if (err) {
5767 				free(line);
5768 				return err;
5769 			}
5770 			waddwstr(view->window, &wline[skip]);
5771 			width += 9;
5772 			free(wline);
5773 			wline = NULL;
5774 		}
5775 
5776 		if (width <= view->ncols - 1)
5777 			waddch(view->window, '\n');
5778 		if (++nprinted == 1)
5779 			s->first_displayed_line = lineno;
5780 	}
5781 	free(line);
5782 	s->last_displayed_line = lineno;
5783 
5784 	view_border(view);
5785 
5786 	return NULL;
5787 }
5788 
5789 static const struct got_error *
5790 blame_cb(void *arg, int nlines, int lineno,
5791     struct got_commit_object *commit, struct got_object_id *id)
5792 {
5793 	const struct got_error *err = NULL;
5794 	struct tog_blame_cb_args *a = arg;
5795 	struct tog_blame_line *line;
5796 	int errcode;
5797 
5798 	if (nlines != a->nlines ||
5799 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5800 		return got_error(GOT_ERR_RANGE);
5801 
5802 	errcode = pthread_mutex_lock(&tog_mutex);
5803 	if (errcode)
5804 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5805 
5806 	if (*a->quit) {	/* user has quit the blame view */
5807 		err = got_error(GOT_ERR_ITER_COMPLETED);
5808 		goto done;
5809 	}
5810 
5811 	if (lineno == -1)
5812 		goto done; /* no change in this commit */
5813 
5814 	line = &a->lines[lineno - 1];
5815 	if (line->annotated)
5816 		goto done;
5817 
5818 	line->id = got_object_id_dup(id);
5819 	if (line->id == NULL) {
5820 		err = got_error_from_errno("got_object_id_dup");
5821 		goto done;
5822 	}
5823 	line->annotated = 1;
5824 done:
5825 	errcode = pthread_mutex_unlock(&tog_mutex);
5826 	if (errcode)
5827 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5828 	return err;
5829 }
5830 
5831 static void *
5832 blame_thread(void *arg)
5833 {
5834 	const struct got_error *err, *close_err;
5835 	struct tog_blame_thread_args *ta = arg;
5836 	struct tog_blame_cb_args *a = ta->cb_args;
5837 	int errcode, fd1 = -1, fd2 = -1;
5838 	FILE *f1 = NULL, *f2 = NULL;
5839 
5840 	fd1 = got_opentempfd();
5841 	if (fd1 == -1)
5842 		return (void *)got_error_from_errno("got_opentempfd");
5843 
5844 	fd2 = got_opentempfd();
5845 	if (fd2 == -1) {
5846 		err = got_error_from_errno("got_opentempfd");
5847 		goto done;
5848 	}
5849 
5850 	f1 = got_opentemp();
5851 	if (f1 == NULL) {
5852 		err = (void *)got_error_from_errno("got_opentemp");
5853 		goto done;
5854 	}
5855 	f2 = got_opentemp();
5856 	if (f2 == NULL) {
5857 		err = (void *)got_error_from_errno("got_opentemp");
5858 		goto done;
5859 	}
5860 
5861 	err = block_signals_used_by_main_thread();
5862 	if (err)
5863 		goto done;
5864 
5865 	err = got_blame(ta->path, a->commit_id, ta->repo,
5866 	    tog_diff_algo, blame_cb, ta->cb_args,
5867 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5868 	if (err && err->code == GOT_ERR_CANCELLED)
5869 		err = NULL;
5870 
5871 	errcode = pthread_mutex_lock(&tog_mutex);
5872 	if (errcode) {
5873 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5874 		goto done;
5875 	}
5876 
5877 	close_err = got_repo_close(ta->repo);
5878 	if (err == NULL)
5879 		err = close_err;
5880 	ta->repo = NULL;
5881 	*ta->complete = 1;
5882 
5883 	errcode = pthread_mutex_unlock(&tog_mutex);
5884 	if (errcode && err == NULL)
5885 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5886 
5887 done:
5888 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5889 		err = got_error_from_errno("close");
5890 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5891 		err = got_error_from_errno("close");
5892 	if (f1 && fclose(f1) == EOF && err == NULL)
5893 		err = got_error_from_errno("fclose");
5894 	if (f2 && fclose(f2) == EOF && err == NULL)
5895 		err = got_error_from_errno("fclose");
5896 
5897 	return (void *)err;
5898 }
5899 
5900 static struct got_object_id *
5901 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5902     int first_displayed_line, int selected_line)
5903 {
5904 	struct tog_blame_line *line;
5905 
5906 	if (nlines <= 0)
5907 		return NULL;
5908 
5909 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5910 	if (!line->annotated)
5911 		return NULL;
5912 
5913 	return line->id;
5914 }
5915 
5916 static struct got_object_id *
5917 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5918     int lineno)
5919 {
5920 	struct tog_blame_line *line;
5921 
5922 	if (nlines <= 0 || lineno >= nlines)
5923 		return NULL;
5924 
5925 	line = &lines[lineno - 1];
5926 	if (!line->annotated)
5927 		return NULL;
5928 
5929 	return line->id;
5930 }
5931 
5932 static const struct got_error *
5933 stop_blame(struct tog_blame *blame)
5934 {
5935 	const struct got_error *err = NULL;
5936 	int i;
5937 
5938 	if (blame->thread) {
5939 		int errcode;
5940 		errcode = pthread_mutex_unlock(&tog_mutex);
5941 		if (errcode)
5942 			return got_error_set_errno(errcode,
5943 			    "pthread_mutex_unlock");
5944 		errcode = pthread_join(blame->thread, (void **)&err);
5945 		if (errcode)
5946 			return got_error_set_errno(errcode, "pthread_join");
5947 		errcode = pthread_mutex_lock(&tog_mutex);
5948 		if (errcode)
5949 			return got_error_set_errno(errcode,
5950 			    "pthread_mutex_lock");
5951 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5952 			err = NULL;
5953 		blame->thread = NULL;
5954 	}
5955 	if (blame->thread_args.repo) {
5956 		const struct got_error *close_err;
5957 		close_err = got_repo_close(blame->thread_args.repo);
5958 		if (err == NULL)
5959 			err = close_err;
5960 		blame->thread_args.repo = NULL;
5961 	}
5962 	if (blame->f) {
5963 		if (fclose(blame->f) == EOF && err == NULL)
5964 			err = got_error_from_errno("fclose");
5965 		blame->f = NULL;
5966 	}
5967 	if (blame->lines) {
5968 		for (i = 0; i < blame->nlines; i++)
5969 			free(blame->lines[i].id);
5970 		free(blame->lines);
5971 		blame->lines = NULL;
5972 	}
5973 	free(blame->cb_args.commit_id);
5974 	blame->cb_args.commit_id = NULL;
5975 	if (blame->pack_fds) {
5976 		const struct got_error *pack_err =
5977 		    got_repo_pack_fds_close(blame->pack_fds);
5978 		if (err == NULL)
5979 			err = pack_err;
5980 		blame->pack_fds = NULL;
5981 	}
5982 	return err;
5983 }
5984 
5985 static const struct got_error *
5986 cancel_blame_view(void *arg)
5987 {
5988 	const struct got_error *err = NULL;
5989 	int *done = arg;
5990 	int errcode;
5991 
5992 	errcode = pthread_mutex_lock(&tog_mutex);
5993 	if (errcode)
5994 		return got_error_set_errno(errcode,
5995 		    "pthread_mutex_unlock");
5996 
5997 	if (*done)
5998 		err = got_error(GOT_ERR_CANCELLED);
5999 
6000 	errcode = pthread_mutex_unlock(&tog_mutex);
6001 	if (errcode)
6002 		return got_error_set_errno(errcode,
6003 		    "pthread_mutex_lock");
6004 
6005 	return err;
6006 }
6007 
6008 static const struct got_error *
6009 run_blame(struct tog_view *view)
6010 {
6011 	struct tog_blame_view_state *s = &view->state.blame;
6012 	struct tog_blame *blame = &s->blame;
6013 	const struct got_error *err = NULL;
6014 	struct got_commit_object *commit = NULL;
6015 	struct got_blob_object *blob = NULL;
6016 	struct got_repository *thread_repo = NULL;
6017 	struct got_object_id *obj_id = NULL;
6018 	int obj_type, fd = -1;
6019 	int *pack_fds = NULL;
6020 
6021 	err = got_object_open_as_commit(&commit, s->repo,
6022 	    &s->blamed_commit->id);
6023 	if (err)
6024 		return err;
6025 
6026 	fd = got_opentempfd();
6027 	if (fd == -1) {
6028 		err = got_error_from_errno("got_opentempfd");
6029 		goto done;
6030 	}
6031 
6032 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6033 	if (err)
6034 		goto done;
6035 
6036 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6037 	if (err)
6038 		goto done;
6039 
6040 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6041 		err = got_error(GOT_ERR_OBJ_TYPE);
6042 		goto done;
6043 	}
6044 
6045 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6046 	if (err)
6047 		goto done;
6048 	blame->f = got_opentemp();
6049 	if (blame->f == NULL) {
6050 		err = got_error_from_errno("got_opentemp");
6051 		goto done;
6052 	}
6053 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6054 	    &blame->line_offsets, blame->f, blob);
6055 	if (err)
6056 		goto done;
6057 	if (blame->nlines == 0) {
6058 		s->blame_complete = 1;
6059 		goto done;
6060 	}
6061 
6062 	/* Don't include \n at EOF in the blame line count. */
6063 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6064 		blame->nlines--;
6065 
6066 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6067 	if (blame->lines == NULL) {
6068 		err = got_error_from_errno("calloc");
6069 		goto done;
6070 	}
6071 
6072 	err = got_repo_pack_fds_open(&pack_fds);
6073 	if (err)
6074 		goto done;
6075 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6076 	    pack_fds);
6077 	if (err)
6078 		goto done;
6079 
6080 	blame->pack_fds = pack_fds;
6081 	blame->cb_args.view = view;
6082 	blame->cb_args.lines = blame->lines;
6083 	blame->cb_args.nlines = blame->nlines;
6084 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6085 	if (blame->cb_args.commit_id == NULL) {
6086 		err = got_error_from_errno("got_object_id_dup");
6087 		goto done;
6088 	}
6089 	blame->cb_args.quit = &s->done;
6090 
6091 	blame->thread_args.path = s->path;
6092 	blame->thread_args.repo = thread_repo;
6093 	blame->thread_args.cb_args = &blame->cb_args;
6094 	blame->thread_args.complete = &s->blame_complete;
6095 	blame->thread_args.cancel_cb = cancel_blame_view;
6096 	blame->thread_args.cancel_arg = &s->done;
6097 	s->blame_complete = 0;
6098 
6099 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6100 		s->first_displayed_line = 1;
6101 		s->last_displayed_line = view->nlines;
6102 		s->selected_line = 1;
6103 	}
6104 	s->matched_line = 0;
6105 
6106 done:
6107 	if (commit)
6108 		got_object_commit_close(commit);
6109 	if (fd != -1 && close(fd) == -1 && err == NULL)
6110 		err = got_error_from_errno("close");
6111 	if (blob)
6112 		got_object_blob_close(blob);
6113 	free(obj_id);
6114 	if (err)
6115 		stop_blame(blame);
6116 	return err;
6117 }
6118 
6119 static const struct got_error *
6120 open_blame_view(struct tog_view *view, char *path,
6121     struct got_object_id *commit_id, struct got_repository *repo)
6122 {
6123 	const struct got_error *err = NULL;
6124 	struct tog_blame_view_state *s = &view->state.blame;
6125 
6126 	STAILQ_INIT(&s->blamed_commits);
6127 
6128 	s->path = strdup(path);
6129 	if (s->path == NULL)
6130 		return got_error_from_errno("strdup");
6131 
6132 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6133 	if (err) {
6134 		free(s->path);
6135 		return err;
6136 	}
6137 
6138 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6139 	s->first_displayed_line = 1;
6140 	s->last_displayed_line = view->nlines;
6141 	s->selected_line = 1;
6142 	s->blame_complete = 0;
6143 	s->repo = repo;
6144 	s->commit_id = commit_id;
6145 	memset(&s->blame, 0, sizeof(s->blame));
6146 
6147 	STAILQ_INIT(&s->colors);
6148 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6149 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6150 		    get_color_value("TOG_COLOR_COMMIT"));
6151 		if (err)
6152 			return err;
6153 	}
6154 
6155 	view->show = show_blame_view;
6156 	view->input = input_blame_view;
6157 	view->reset = reset_blame_view;
6158 	view->close = close_blame_view;
6159 	view->search_start = search_start_blame_view;
6160 	view->search_setup = search_setup_blame_view;
6161 	view->search_next = search_next_view_match;
6162 
6163 	return run_blame(view);
6164 }
6165 
6166 static const struct got_error *
6167 close_blame_view(struct tog_view *view)
6168 {
6169 	const struct got_error *err = NULL;
6170 	struct tog_blame_view_state *s = &view->state.blame;
6171 
6172 	if (s->blame.thread)
6173 		err = stop_blame(&s->blame);
6174 
6175 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6176 		struct got_object_qid *blamed_commit;
6177 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6178 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6179 		got_object_qid_free(blamed_commit);
6180 	}
6181 
6182 	free(s->path);
6183 	free_colors(&s->colors);
6184 	return err;
6185 }
6186 
6187 static const struct got_error *
6188 search_start_blame_view(struct tog_view *view)
6189 {
6190 	struct tog_blame_view_state *s = &view->state.blame;
6191 
6192 	s->matched_line = 0;
6193 	return NULL;
6194 }
6195 
6196 static void
6197 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6198     size_t *nlines, int **first, int **last, int **match, int **selected)
6199 {
6200 	struct tog_blame_view_state *s = &view->state.blame;
6201 
6202 	*f = s->blame.f;
6203 	*nlines = s->blame.nlines;
6204 	*line_offsets = s->blame.line_offsets;
6205 	*match = &s->matched_line;
6206 	*first = &s->first_displayed_line;
6207 	*last = &s->last_displayed_line;
6208 	*selected = &s->selected_line;
6209 }
6210 
6211 static const struct got_error *
6212 show_blame_view(struct tog_view *view)
6213 {
6214 	const struct got_error *err = NULL;
6215 	struct tog_blame_view_state *s = &view->state.blame;
6216 	int errcode;
6217 
6218 	if (s->blame.thread == NULL && !s->blame_complete) {
6219 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6220 		    &s->blame.thread_args);
6221 		if (errcode)
6222 			return got_error_set_errno(errcode, "pthread_create");
6223 
6224 		halfdelay(1); /* fast refresh while annotating  */
6225 	}
6226 
6227 	if (s->blame_complete)
6228 		halfdelay(10); /* disable fast refresh */
6229 
6230 	err = draw_blame(view);
6231 
6232 	view_border(view);
6233 	return err;
6234 }
6235 
6236 static const struct got_error *
6237 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6238     struct got_repository *repo, struct got_object_id *id)
6239 {
6240 	struct tog_view		*log_view;
6241 	const struct got_error	*err = NULL;
6242 
6243 	*new_view = NULL;
6244 
6245 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6246 	if (log_view == NULL)
6247 		return got_error_from_errno("view_open");
6248 
6249 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6250 	if (err)
6251 		view_close(log_view);
6252 	else
6253 		*new_view = log_view;
6254 
6255 	return err;
6256 }
6257 
6258 static const struct got_error *
6259 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6260 {
6261 	const struct got_error *err = NULL, *thread_err = NULL;
6262 	struct tog_view *diff_view;
6263 	struct tog_blame_view_state *s = &view->state.blame;
6264 	int eos, nscroll, begin_y = 0, begin_x = 0;
6265 
6266 	eos = nscroll = view->nlines - 2;
6267 	if (view_is_hsplit_top(view))
6268 		--eos;  /* border */
6269 
6270 	switch (ch) {
6271 	case '0':
6272 		view->x = 0;
6273 		break;
6274 	case '$':
6275 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6276 		view->count = 0;
6277 		break;
6278 	case KEY_RIGHT:
6279 	case 'l':
6280 		if (view->x + view->ncols / 3 < view->maxx)
6281 			view->x += 2;  /* move two columns right */
6282 		else
6283 			view->count = 0;
6284 		break;
6285 	case KEY_LEFT:
6286 	case 'h':
6287 		view->x -= MIN(view->x, 2);  /* move two columns back */
6288 		if (view->x <= 0)
6289 			view->count = 0;
6290 		break;
6291 	case 'q':
6292 		s->done = 1;
6293 		break;
6294 	case 'g':
6295 	case KEY_HOME:
6296 		s->selected_line = 1;
6297 		s->first_displayed_line = 1;
6298 		view->count = 0;
6299 		break;
6300 	case 'G':
6301 	case KEY_END:
6302 		if (s->blame.nlines < eos) {
6303 			s->selected_line = s->blame.nlines;
6304 			s->first_displayed_line = 1;
6305 		} else {
6306 			s->selected_line = eos;
6307 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6308 		}
6309 		view->count = 0;
6310 		break;
6311 	case 'k':
6312 	case KEY_UP:
6313 	case CTRL('p'):
6314 		if (s->selected_line > 1)
6315 			s->selected_line--;
6316 		else if (s->selected_line == 1 &&
6317 		    s->first_displayed_line > 1)
6318 			s->first_displayed_line--;
6319 		else
6320 			view->count = 0;
6321 		break;
6322 	case CTRL('u'):
6323 	case 'u':
6324 		nscroll /= 2;
6325 		/* FALL THROUGH */
6326 	case KEY_PPAGE:
6327 	case CTRL('b'):
6328 	case 'b':
6329 		if (s->first_displayed_line == 1) {
6330 			if (view->count > 1)
6331 				nscroll += nscroll;
6332 			s->selected_line = MAX(1, s->selected_line - nscroll);
6333 			view->count = 0;
6334 			break;
6335 		}
6336 		if (s->first_displayed_line > nscroll)
6337 			s->first_displayed_line -= nscroll;
6338 		else
6339 			s->first_displayed_line = 1;
6340 		break;
6341 	case 'j':
6342 	case KEY_DOWN:
6343 	case CTRL('n'):
6344 		if (s->selected_line < eos && s->first_displayed_line +
6345 		    s->selected_line <= s->blame.nlines)
6346 			s->selected_line++;
6347 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6348 			s->first_displayed_line++;
6349 		else
6350 			view->count = 0;
6351 		break;
6352 	case 'c':
6353 	case 'p': {
6354 		struct got_object_id *id = NULL;
6355 
6356 		view->count = 0;
6357 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6358 		    s->first_displayed_line, s->selected_line);
6359 		if (id == NULL)
6360 			break;
6361 		if (ch == 'p') {
6362 			struct got_commit_object *commit, *pcommit;
6363 			struct got_object_qid *pid;
6364 			struct got_object_id *blob_id = NULL;
6365 			int obj_type;
6366 			err = got_object_open_as_commit(&commit,
6367 			    s->repo, id);
6368 			if (err)
6369 				break;
6370 			pid = STAILQ_FIRST(
6371 			    got_object_commit_get_parent_ids(commit));
6372 			if (pid == NULL) {
6373 				got_object_commit_close(commit);
6374 				break;
6375 			}
6376 			/* Check if path history ends here. */
6377 			err = got_object_open_as_commit(&pcommit,
6378 			    s->repo, &pid->id);
6379 			if (err)
6380 				break;
6381 			err = got_object_id_by_path(&blob_id, s->repo,
6382 			    pcommit, s->path);
6383 			got_object_commit_close(pcommit);
6384 			if (err) {
6385 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6386 					err = NULL;
6387 				got_object_commit_close(commit);
6388 				break;
6389 			}
6390 			err = got_object_get_type(&obj_type, s->repo,
6391 			    blob_id);
6392 			free(blob_id);
6393 			/* Can't blame non-blob type objects. */
6394 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6395 				got_object_commit_close(commit);
6396 				break;
6397 			}
6398 			err = got_object_qid_alloc(&s->blamed_commit,
6399 			    &pid->id);
6400 			got_object_commit_close(commit);
6401 		} else {
6402 			if (got_object_id_cmp(id,
6403 			    &s->blamed_commit->id) == 0)
6404 				break;
6405 			err = got_object_qid_alloc(&s->blamed_commit,
6406 			    id);
6407 		}
6408 		if (err)
6409 			break;
6410 		s->done = 1;
6411 		thread_err = stop_blame(&s->blame);
6412 		s->done = 0;
6413 		if (thread_err)
6414 			break;
6415 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6416 		    s->blamed_commit, entry);
6417 		err = run_blame(view);
6418 		if (err)
6419 			break;
6420 		break;
6421 	}
6422 	case 'C': {
6423 		struct got_object_qid *first;
6424 
6425 		view->count = 0;
6426 		first = STAILQ_FIRST(&s->blamed_commits);
6427 		if (!got_object_id_cmp(&first->id, s->commit_id))
6428 			break;
6429 		s->done = 1;
6430 		thread_err = stop_blame(&s->blame);
6431 		s->done = 0;
6432 		if (thread_err)
6433 			break;
6434 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6435 		got_object_qid_free(s->blamed_commit);
6436 		s->blamed_commit =
6437 		    STAILQ_FIRST(&s->blamed_commits);
6438 		err = run_blame(view);
6439 		if (err)
6440 			break;
6441 		break;
6442 	}
6443 	case 'L':
6444 		view->count = 0;
6445 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6446 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6447 		if (s->id_to_log)
6448 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6449 		break;
6450 	case KEY_ENTER:
6451 	case '\r': {
6452 		struct got_object_id *id = NULL;
6453 		struct got_object_qid *pid;
6454 		struct got_commit_object *commit = NULL;
6455 
6456 		view->count = 0;
6457 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6458 		    s->first_displayed_line, s->selected_line);
6459 		if (id == NULL)
6460 			break;
6461 		err = got_object_open_as_commit(&commit, s->repo, id);
6462 		if (err)
6463 			break;
6464 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6465 		if (*new_view) {
6466 			/* traversed from diff view, release diff resources  */
6467 			err = close_diff_view(*new_view);
6468 			if (err)
6469 				break;
6470 			diff_view = *new_view;
6471 		} else {
6472 			if (view_is_parent_view(view))
6473 				view_get_split(view, &begin_y, &begin_x);
6474 
6475 			diff_view = view_open(0, 0, begin_y, begin_x,
6476 			    TOG_VIEW_DIFF);
6477 			if (diff_view == NULL) {
6478 				got_object_commit_close(commit);
6479 				err = got_error_from_errno("view_open");
6480 				break;
6481 			}
6482 		}
6483 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6484 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6485 		got_object_commit_close(commit);
6486 		if (err) {
6487 			view_close(diff_view);
6488 			break;
6489 		}
6490 		s->last_diffed_line = s->first_displayed_line - 1 +
6491 		    s->selected_line;
6492 		if (*new_view)
6493 			break;	/* still open from active diff view */
6494 		if (view_is_parent_view(view) &&
6495 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6496 			err = view_init_hsplit(view, begin_y);
6497 			if (err)
6498 				break;
6499 		}
6500 
6501 		view->focussed = 0;
6502 		diff_view->focussed = 1;
6503 		diff_view->mode = view->mode;
6504 		diff_view->nlines = view->lines - begin_y;
6505 		if (view_is_parent_view(view)) {
6506 			view_transfer_size(diff_view, view);
6507 			err = view_close_child(view);
6508 			if (err)
6509 				break;
6510 			err = view_set_child(view, diff_view);
6511 			if (err)
6512 				break;
6513 			view->focus_child = 1;
6514 		} else
6515 			*new_view = diff_view;
6516 		if (err)
6517 			break;
6518 		break;
6519 	}
6520 	case CTRL('d'):
6521 	case 'd':
6522 		nscroll /= 2;
6523 		/* FALL THROUGH */
6524 	case KEY_NPAGE:
6525 	case CTRL('f'):
6526 	case 'f':
6527 	case ' ':
6528 		if (s->last_displayed_line >= s->blame.nlines &&
6529 		    s->selected_line >= MIN(s->blame.nlines,
6530 		    view->nlines - 2)) {
6531 			view->count = 0;
6532 			break;
6533 		}
6534 		if (s->last_displayed_line >= s->blame.nlines &&
6535 		    s->selected_line < view->nlines - 2) {
6536 			s->selected_line +=
6537 			    MIN(nscroll, s->last_displayed_line -
6538 			    s->first_displayed_line - s->selected_line + 1);
6539 		}
6540 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6541 			s->first_displayed_line += nscroll;
6542 		else
6543 			s->first_displayed_line =
6544 			    s->blame.nlines - (view->nlines - 3);
6545 		break;
6546 	case KEY_RESIZE:
6547 		if (s->selected_line > view->nlines - 2) {
6548 			s->selected_line = MIN(s->blame.nlines,
6549 			    view->nlines - 2);
6550 		}
6551 		break;
6552 	default:
6553 		view->count = 0;
6554 		break;
6555 	}
6556 	return thread_err ? thread_err : err;
6557 }
6558 
6559 static const struct got_error *
6560 reset_blame_view(struct tog_view *view)
6561 {
6562 	const struct got_error *err;
6563 	struct tog_blame_view_state *s = &view->state.blame;
6564 
6565 	view->count = 0;
6566 	s->done = 1;
6567 	err = stop_blame(&s->blame);
6568 	s->done = 0;
6569 	if (err)
6570 		return err;
6571 	return run_blame(view);
6572 }
6573 
6574 static const struct got_error *
6575 cmd_blame(int argc, char *argv[])
6576 {
6577 	const struct got_error *error;
6578 	struct got_repository *repo = NULL;
6579 	struct got_worktree *worktree = NULL;
6580 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6581 	char *link_target = NULL;
6582 	struct got_object_id *commit_id = NULL;
6583 	struct got_commit_object *commit = NULL;
6584 	char *commit_id_str = NULL;
6585 	int ch;
6586 	struct tog_view *view;
6587 	int *pack_fds = NULL;
6588 
6589 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6590 		switch (ch) {
6591 		case 'c':
6592 			commit_id_str = optarg;
6593 			break;
6594 		case 'r':
6595 			repo_path = realpath(optarg, NULL);
6596 			if (repo_path == NULL)
6597 				return got_error_from_errno2("realpath",
6598 				    optarg);
6599 			break;
6600 		default:
6601 			usage_blame();
6602 			/* NOTREACHED */
6603 		}
6604 	}
6605 
6606 	argc -= optind;
6607 	argv += optind;
6608 
6609 	if (argc != 1)
6610 		usage_blame();
6611 
6612 	error = got_repo_pack_fds_open(&pack_fds);
6613 	if (error != NULL)
6614 		goto done;
6615 
6616 	if (repo_path == NULL) {
6617 		cwd = getcwd(NULL, 0);
6618 		if (cwd == NULL)
6619 			return got_error_from_errno("getcwd");
6620 		error = got_worktree_open(&worktree, cwd);
6621 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6622 			goto done;
6623 		if (worktree)
6624 			repo_path =
6625 			    strdup(got_worktree_get_repo_path(worktree));
6626 		else
6627 			repo_path = strdup(cwd);
6628 		if (repo_path == NULL) {
6629 			error = got_error_from_errno("strdup");
6630 			goto done;
6631 		}
6632 	}
6633 
6634 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6635 	if (error != NULL)
6636 		goto done;
6637 
6638 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6639 	    worktree);
6640 	if (error)
6641 		goto done;
6642 
6643 	init_curses();
6644 
6645 	error = apply_unveil(got_repo_get_path(repo), NULL);
6646 	if (error)
6647 		goto done;
6648 
6649 	error = tog_load_refs(repo, 0);
6650 	if (error)
6651 		goto done;
6652 
6653 	if (commit_id_str == NULL) {
6654 		struct got_reference *head_ref;
6655 		error = got_ref_open(&head_ref, repo, worktree ?
6656 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6657 		if (error != NULL)
6658 			goto done;
6659 		error = got_ref_resolve(&commit_id, repo, head_ref);
6660 		got_ref_close(head_ref);
6661 	} else {
6662 		error = got_repo_match_object_id(&commit_id, NULL,
6663 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6664 	}
6665 	if (error != NULL)
6666 		goto done;
6667 
6668 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6669 	if (view == NULL) {
6670 		error = got_error_from_errno("view_open");
6671 		goto done;
6672 	}
6673 
6674 	error = got_object_open_as_commit(&commit, repo, commit_id);
6675 	if (error)
6676 		goto done;
6677 
6678 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6679 	    commit, repo);
6680 	if (error)
6681 		goto done;
6682 
6683 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6684 	    commit_id, repo);
6685 	if (error)
6686 		goto done;
6687 	if (worktree) {
6688 		/* Release work tree lock. */
6689 		got_worktree_close(worktree);
6690 		worktree = NULL;
6691 	}
6692 	error = view_loop(view);
6693 done:
6694 	free(repo_path);
6695 	free(in_repo_path);
6696 	free(link_target);
6697 	free(cwd);
6698 	free(commit_id);
6699 	if (commit)
6700 		got_object_commit_close(commit);
6701 	if (worktree)
6702 		got_worktree_close(worktree);
6703 	if (repo) {
6704 		const struct got_error *close_err = got_repo_close(repo);
6705 		if (error == NULL)
6706 			error = close_err;
6707 	}
6708 	if (pack_fds) {
6709 		const struct got_error *pack_err =
6710 		    got_repo_pack_fds_close(pack_fds);
6711 		if (error == NULL)
6712 			error = pack_err;
6713 	}
6714 	tog_free_refs();
6715 	return error;
6716 }
6717 
6718 static const struct got_error *
6719 draw_tree_entries(struct tog_view *view, const char *parent_path)
6720 {
6721 	struct tog_tree_view_state *s = &view->state.tree;
6722 	const struct got_error *err = NULL;
6723 	struct got_tree_entry *te;
6724 	wchar_t *wline;
6725 	char *index = NULL;
6726 	struct tog_color *tc;
6727 	int width, n, nentries, i = 1;
6728 	int limit = view->nlines;
6729 
6730 	s->ndisplayed = 0;
6731 	if (view_is_hsplit_top(view))
6732 		--limit;  /* border */
6733 
6734 	werase(view->window);
6735 
6736 	if (limit == 0)
6737 		return NULL;
6738 
6739 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6740 	    0, 0);
6741 	if (err)
6742 		return err;
6743 	if (view_needs_focus_indication(view))
6744 		wstandout(view->window);
6745 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6746 	if (tc)
6747 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6748 	waddwstr(view->window, wline);
6749 	free(wline);
6750 	wline = NULL;
6751 	while (width++ < view->ncols)
6752 		waddch(view->window, ' ');
6753 	if (tc)
6754 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6755 	if (view_needs_focus_indication(view))
6756 		wstandend(view->window);
6757 	if (--limit <= 0)
6758 		return NULL;
6759 
6760 	i += s->selected;
6761 	if (s->first_displayed_entry) {
6762 		i += got_tree_entry_get_index(s->first_displayed_entry);
6763 		if (s->tree != s->root)
6764 			++i;  /* account for ".." entry */
6765 	}
6766 	nentries = got_object_tree_get_nentries(s->tree);
6767 	if (asprintf(&index, "[%d/%d] %s",
6768 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6769 		return got_error_from_errno("asprintf");
6770 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6771 	free(index);
6772 	if (err)
6773 		return err;
6774 	waddwstr(view->window, wline);
6775 	free(wline);
6776 	wline = NULL;
6777 	if (width < view->ncols - 1)
6778 		waddch(view->window, '\n');
6779 	if (--limit <= 0)
6780 		return NULL;
6781 	waddch(view->window, '\n');
6782 	if (--limit <= 0)
6783 		return NULL;
6784 
6785 	if (s->first_displayed_entry == NULL) {
6786 		te = got_object_tree_get_first_entry(s->tree);
6787 		if (s->selected == 0) {
6788 			if (view->focussed)
6789 				wstandout(view->window);
6790 			s->selected_entry = NULL;
6791 		}
6792 		waddstr(view->window, "  ..\n");	/* parent directory */
6793 		if (s->selected == 0 && view->focussed)
6794 			wstandend(view->window);
6795 		s->ndisplayed++;
6796 		if (--limit <= 0)
6797 			return NULL;
6798 		n = 1;
6799 	} else {
6800 		n = 0;
6801 		te = s->first_displayed_entry;
6802 	}
6803 
6804 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6805 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6806 		const char *modestr = "";
6807 		mode_t mode;
6808 
6809 		te = got_object_tree_get_entry(s->tree, i);
6810 		mode = got_tree_entry_get_mode(te);
6811 
6812 		if (s->show_ids) {
6813 			err = got_object_id_str(&id_str,
6814 			    got_tree_entry_get_id(te));
6815 			if (err)
6816 				return got_error_from_errno(
6817 				    "got_object_id_str");
6818 		}
6819 		if (got_object_tree_entry_is_submodule(te))
6820 			modestr = "$";
6821 		else if (S_ISLNK(mode)) {
6822 			int i;
6823 
6824 			err = got_tree_entry_get_symlink_target(&link_target,
6825 			    te, s->repo);
6826 			if (err) {
6827 				free(id_str);
6828 				return err;
6829 			}
6830 			for (i = 0; i < strlen(link_target); i++) {
6831 				if (!isprint((unsigned char)link_target[i]))
6832 					link_target[i] = '?';
6833 			}
6834 			modestr = "@";
6835 		}
6836 		else if (S_ISDIR(mode))
6837 			modestr = "/";
6838 		else if (mode & S_IXUSR)
6839 			modestr = "*";
6840 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6841 		    got_tree_entry_get_name(te), modestr,
6842 		    link_target ? " -> ": "",
6843 		    link_target ? link_target : "") == -1) {
6844 			free(id_str);
6845 			free(link_target);
6846 			return got_error_from_errno("asprintf");
6847 		}
6848 		free(id_str);
6849 		free(link_target);
6850 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6851 		    0, 0);
6852 		if (err) {
6853 			free(line);
6854 			break;
6855 		}
6856 		if (n == s->selected) {
6857 			if (view->focussed)
6858 				wstandout(view->window);
6859 			s->selected_entry = te;
6860 		}
6861 		tc = match_color(&s->colors, line);
6862 		if (tc)
6863 			wattr_on(view->window,
6864 			    COLOR_PAIR(tc->colorpair), NULL);
6865 		waddwstr(view->window, wline);
6866 		if (tc)
6867 			wattr_off(view->window,
6868 			    COLOR_PAIR(tc->colorpair), NULL);
6869 		if (width < view->ncols - 1)
6870 			waddch(view->window, '\n');
6871 		if (n == s->selected && view->focussed)
6872 			wstandend(view->window);
6873 		free(line);
6874 		free(wline);
6875 		wline = NULL;
6876 		n++;
6877 		s->ndisplayed++;
6878 		s->last_displayed_entry = te;
6879 		if (--limit <= 0)
6880 			break;
6881 	}
6882 
6883 	return err;
6884 }
6885 
6886 static void
6887 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6888 {
6889 	struct got_tree_entry *te;
6890 	int isroot = s->tree == s->root;
6891 	int i = 0;
6892 
6893 	if (s->first_displayed_entry == NULL)
6894 		return;
6895 
6896 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6897 	while (i++ < maxscroll) {
6898 		if (te == NULL) {
6899 			if (!isroot)
6900 				s->first_displayed_entry = NULL;
6901 			break;
6902 		}
6903 		s->first_displayed_entry = te;
6904 		te = got_tree_entry_get_prev(s->tree, te);
6905 	}
6906 }
6907 
6908 static const struct got_error *
6909 tree_scroll_down(struct tog_view *view, int maxscroll)
6910 {
6911 	struct tog_tree_view_state *s = &view->state.tree;
6912 	struct got_tree_entry *next, *last;
6913 	int n = 0;
6914 
6915 	if (s->first_displayed_entry)
6916 		next = got_tree_entry_get_next(s->tree,
6917 		    s->first_displayed_entry);
6918 	else
6919 		next = got_object_tree_get_first_entry(s->tree);
6920 
6921 	last = s->last_displayed_entry;
6922 	while (next && n++ < maxscroll) {
6923 		if (last) {
6924 			s->last_displayed_entry = last;
6925 			last = got_tree_entry_get_next(s->tree, last);
6926 		}
6927 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6928 			s->first_displayed_entry = next;
6929 			next = got_tree_entry_get_next(s->tree, next);
6930 		}
6931 	}
6932 
6933 	return NULL;
6934 }
6935 
6936 static const struct got_error *
6937 tree_entry_path(char **path, struct tog_parent_trees *parents,
6938     struct got_tree_entry *te)
6939 {
6940 	const struct got_error *err = NULL;
6941 	struct tog_parent_tree *pt;
6942 	size_t len = 2; /* for leading slash and NUL */
6943 
6944 	TAILQ_FOREACH(pt, parents, entry)
6945 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6946 		    + 1 /* slash */;
6947 	if (te)
6948 		len += strlen(got_tree_entry_get_name(te));
6949 
6950 	*path = calloc(1, len);
6951 	if (path == NULL)
6952 		return got_error_from_errno("calloc");
6953 
6954 	(*path)[0] = '/';
6955 	pt = TAILQ_LAST(parents, tog_parent_trees);
6956 	while (pt) {
6957 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6958 		if (strlcat(*path, name, len) >= len) {
6959 			err = got_error(GOT_ERR_NO_SPACE);
6960 			goto done;
6961 		}
6962 		if (strlcat(*path, "/", len) >= len) {
6963 			err = got_error(GOT_ERR_NO_SPACE);
6964 			goto done;
6965 		}
6966 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6967 	}
6968 	if (te) {
6969 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6970 			err = got_error(GOT_ERR_NO_SPACE);
6971 			goto done;
6972 		}
6973 	}
6974 done:
6975 	if (err) {
6976 		free(*path);
6977 		*path = NULL;
6978 	}
6979 	return err;
6980 }
6981 
6982 static const struct got_error *
6983 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6984     struct got_tree_entry *te, struct tog_parent_trees *parents,
6985     struct got_object_id *commit_id, struct got_repository *repo)
6986 {
6987 	const struct got_error *err = NULL;
6988 	char *path;
6989 	struct tog_view *blame_view;
6990 
6991 	*new_view = NULL;
6992 
6993 	err = tree_entry_path(&path, parents, te);
6994 	if (err)
6995 		return err;
6996 
6997 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6998 	if (blame_view == NULL) {
6999 		err = got_error_from_errno("view_open");
7000 		goto done;
7001 	}
7002 
7003 	err = open_blame_view(blame_view, path, commit_id, repo);
7004 	if (err) {
7005 		if (err->code == GOT_ERR_CANCELLED)
7006 			err = NULL;
7007 		view_close(blame_view);
7008 	} else
7009 		*new_view = blame_view;
7010 done:
7011 	free(path);
7012 	return err;
7013 }
7014 
7015 static const struct got_error *
7016 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7017     struct tog_tree_view_state *s)
7018 {
7019 	struct tog_view *log_view;
7020 	const struct got_error *err = NULL;
7021 	char *path;
7022 
7023 	*new_view = NULL;
7024 
7025 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7026 	if (log_view == NULL)
7027 		return got_error_from_errno("view_open");
7028 
7029 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7030 	if (err)
7031 		return err;
7032 
7033 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7034 	    path, 0);
7035 	if (err)
7036 		view_close(log_view);
7037 	else
7038 		*new_view = log_view;
7039 	free(path);
7040 	return err;
7041 }
7042 
7043 static const struct got_error *
7044 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7045     const char *head_ref_name, struct got_repository *repo)
7046 {
7047 	const struct got_error *err = NULL;
7048 	char *commit_id_str = NULL;
7049 	struct tog_tree_view_state *s = &view->state.tree;
7050 	struct got_commit_object *commit = NULL;
7051 
7052 	TAILQ_INIT(&s->parents);
7053 	STAILQ_INIT(&s->colors);
7054 
7055 	s->commit_id = got_object_id_dup(commit_id);
7056 	if (s->commit_id == NULL)
7057 		return got_error_from_errno("got_object_id_dup");
7058 
7059 	err = got_object_open_as_commit(&commit, repo, commit_id);
7060 	if (err)
7061 		goto done;
7062 
7063 	/*
7064 	 * The root is opened here and will be closed when the view is closed.
7065 	 * Any visited subtrees and their path-wise parents are opened and
7066 	 * closed on demand.
7067 	 */
7068 	err = got_object_open_as_tree(&s->root, repo,
7069 	    got_object_commit_get_tree_id(commit));
7070 	if (err)
7071 		goto done;
7072 	s->tree = s->root;
7073 
7074 	err = got_object_id_str(&commit_id_str, commit_id);
7075 	if (err != NULL)
7076 		goto done;
7077 
7078 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7079 		err = got_error_from_errno("asprintf");
7080 		goto done;
7081 	}
7082 
7083 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7084 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7085 	if (head_ref_name) {
7086 		s->head_ref_name = strdup(head_ref_name);
7087 		if (s->head_ref_name == NULL) {
7088 			err = got_error_from_errno("strdup");
7089 			goto done;
7090 		}
7091 	}
7092 	s->repo = repo;
7093 
7094 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7095 		err = add_color(&s->colors, "\\$$",
7096 		    TOG_COLOR_TREE_SUBMODULE,
7097 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7098 		if (err)
7099 			goto done;
7100 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7101 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7102 		if (err)
7103 			goto done;
7104 		err = add_color(&s->colors, "/$",
7105 		    TOG_COLOR_TREE_DIRECTORY,
7106 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7107 		if (err)
7108 			goto done;
7109 
7110 		err = add_color(&s->colors, "\\*$",
7111 		    TOG_COLOR_TREE_EXECUTABLE,
7112 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7113 		if (err)
7114 			goto done;
7115 
7116 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7117 		    get_color_value("TOG_COLOR_COMMIT"));
7118 		if (err)
7119 			goto done;
7120 	}
7121 
7122 	view->show = show_tree_view;
7123 	view->input = input_tree_view;
7124 	view->close = close_tree_view;
7125 	view->search_start = search_start_tree_view;
7126 	view->search_next = search_next_tree_view;
7127 done:
7128 	free(commit_id_str);
7129 	if (commit)
7130 		got_object_commit_close(commit);
7131 	if (err)
7132 		close_tree_view(view);
7133 	return err;
7134 }
7135 
7136 static const struct got_error *
7137 close_tree_view(struct tog_view *view)
7138 {
7139 	struct tog_tree_view_state *s = &view->state.tree;
7140 
7141 	free_colors(&s->colors);
7142 	free(s->tree_label);
7143 	s->tree_label = NULL;
7144 	free(s->commit_id);
7145 	s->commit_id = NULL;
7146 	free(s->head_ref_name);
7147 	s->head_ref_name = NULL;
7148 	while (!TAILQ_EMPTY(&s->parents)) {
7149 		struct tog_parent_tree *parent;
7150 		parent = TAILQ_FIRST(&s->parents);
7151 		TAILQ_REMOVE(&s->parents, parent, entry);
7152 		if (parent->tree != s->root)
7153 			got_object_tree_close(parent->tree);
7154 		free(parent);
7155 
7156 	}
7157 	if (s->tree != NULL && s->tree != s->root)
7158 		got_object_tree_close(s->tree);
7159 	if (s->root)
7160 		got_object_tree_close(s->root);
7161 	return NULL;
7162 }
7163 
7164 static const struct got_error *
7165 search_start_tree_view(struct tog_view *view)
7166 {
7167 	struct tog_tree_view_state *s = &view->state.tree;
7168 
7169 	s->matched_entry = NULL;
7170 	return NULL;
7171 }
7172 
7173 static int
7174 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7175 {
7176 	regmatch_t regmatch;
7177 
7178 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7179 	    0) == 0;
7180 }
7181 
7182 static const struct got_error *
7183 search_next_tree_view(struct tog_view *view)
7184 {
7185 	struct tog_tree_view_state *s = &view->state.tree;
7186 	struct got_tree_entry *te = NULL;
7187 
7188 	if (!view->searching) {
7189 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7190 		return NULL;
7191 	}
7192 
7193 	if (s->matched_entry) {
7194 		if (view->searching == TOG_SEARCH_FORWARD) {
7195 			if (s->selected_entry)
7196 				te = got_tree_entry_get_next(s->tree,
7197 				    s->selected_entry);
7198 			else
7199 				te = got_object_tree_get_first_entry(s->tree);
7200 		} else {
7201 			if (s->selected_entry == NULL)
7202 				te = got_object_tree_get_last_entry(s->tree);
7203 			else
7204 				te = got_tree_entry_get_prev(s->tree,
7205 				    s->selected_entry);
7206 		}
7207 	} else {
7208 		if (s->selected_entry)
7209 			te = s->selected_entry;
7210 		else if (view->searching == TOG_SEARCH_FORWARD)
7211 			te = got_object_tree_get_first_entry(s->tree);
7212 		else
7213 			te = got_object_tree_get_last_entry(s->tree);
7214 	}
7215 
7216 	while (1) {
7217 		if (te == NULL) {
7218 			if (s->matched_entry == NULL) {
7219 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7220 				return NULL;
7221 			}
7222 			if (view->searching == TOG_SEARCH_FORWARD)
7223 				te = got_object_tree_get_first_entry(s->tree);
7224 			else
7225 				te = got_object_tree_get_last_entry(s->tree);
7226 		}
7227 
7228 		if (match_tree_entry(te, &view->regex)) {
7229 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7230 			s->matched_entry = te;
7231 			break;
7232 		}
7233 
7234 		if (view->searching == TOG_SEARCH_FORWARD)
7235 			te = got_tree_entry_get_next(s->tree, te);
7236 		else
7237 			te = got_tree_entry_get_prev(s->tree, te);
7238 	}
7239 
7240 	if (s->matched_entry) {
7241 		s->first_displayed_entry = s->matched_entry;
7242 		s->selected = 0;
7243 	}
7244 
7245 	return NULL;
7246 }
7247 
7248 static const struct got_error *
7249 show_tree_view(struct tog_view *view)
7250 {
7251 	const struct got_error *err = NULL;
7252 	struct tog_tree_view_state *s = &view->state.tree;
7253 	char *parent_path;
7254 
7255 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7256 	if (err)
7257 		return err;
7258 
7259 	err = draw_tree_entries(view, parent_path);
7260 	free(parent_path);
7261 
7262 	view_border(view);
7263 	return err;
7264 }
7265 
7266 static const struct got_error *
7267 tree_goto_line(struct tog_view *view, int nlines)
7268 {
7269 	const struct got_error		 *err = NULL;
7270 	struct tog_tree_view_state	 *s = &view->state.tree;
7271 	struct got_tree_entry		**fte, **lte, **ste;
7272 	int				  g, last, first = 1, i = 1;
7273 	int				  root = s->tree == s->root;
7274 	int				  off = root ? 1 : 2;
7275 
7276 	g = view->gline;
7277 	view->gline = 0;
7278 
7279 	if (g == 0)
7280 		g = 1;
7281 	else if (g > got_object_tree_get_nentries(s->tree))
7282 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7283 
7284 	fte = &s->first_displayed_entry;
7285 	lte = &s->last_displayed_entry;
7286 	ste = &s->selected_entry;
7287 
7288 	if (*fte != NULL) {
7289 		first = got_tree_entry_get_index(*fte);
7290 		first += off;  /* account for ".." */
7291 	}
7292 	last = got_tree_entry_get_index(*lte);
7293 	last += off;
7294 
7295 	if (g >= first && g <= last && g - first < nlines) {
7296 		s->selected = g - first;
7297 		return NULL;	/* gline is on the current page */
7298 	}
7299 
7300 	if (*ste != NULL) {
7301 		i = got_tree_entry_get_index(*ste);
7302 		i += off;
7303 	}
7304 
7305 	if (i < g) {
7306 		err = tree_scroll_down(view, g - i);
7307 		if (err)
7308 			return err;
7309 		if (got_tree_entry_get_index(*lte) >=
7310 		    got_object_tree_get_nentries(s->tree) - 1 &&
7311 		    first + s->selected < g &&
7312 		    s->selected < s->ndisplayed - 1) {
7313 			first = got_tree_entry_get_index(*fte);
7314 			first += off;
7315 			s->selected = g - first;
7316 		}
7317 	} else if (i > g)
7318 		tree_scroll_up(s, i - g);
7319 
7320 	if (g < nlines &&
7321 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7322 		s->selected = g - 1;
7323 
7324 	return NULL;
7325 }
7326 
7327 static const struct got_error *
7328 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7329 {
7330 	const struct got_error *err = NULL;
7331 	struct tog_tree_view_state *s = &view->state.tree;
7332 	struct got_tree_entry *te;
7333 	int n, nscroll = view->nlines - 3;
7334 
7335 	if (view->gline)
7336 		return tree_goto_line(view, nscroll);
7337 
7338 	switch (ch) {
7339 	case 'i':
7340 		s->show_ids = !s->show_ids;
7341 		view->count = 0;
7342 		break;
7343 	case 'L':
7344 		view->count = 0;
7345 		if (!s->selected_entry)
7346 			break;
7347 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7348 		break;
7349 	case 'R':
7350 		view->count = 0;
7351 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7352 		break;
7353 	case 'g':
7354 	case '=':
7355 	case KEY_HOME:
7356 		s->selected = 0;
7357 		view->count = 0;
7358 		if (s->tree == s->root)
7359 			s->first_displayed_entry =
7360 			    got_object_tree_get_first_entry(s->tree);
7361 		else
7362 			s->first_displayed_entry = NULL;
7363 		break;
7364 	case 'G':
7365 	case '*':
7366 	case KEY_END: {
7367 		int eos = view->nlines - 3;
7368 
7369 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7370 			--eos;  /* border */
7371 		s->selected = 0;
7372 		view->count = 0;
7373 		te = got_object_tree_get_last_entry(s->tree);
7374 		for (n = 0; n < eos; n++) {
7375 			if (te == NULL) {
7376 				if (s->tree != s->root) {
7377 					s->first_displayed_entry = NULL;
7378 					n++;
7379 				}
7380 				break;
7381 			}
7382 			s->first_displayed_entry = te;
7383 			te = got_tree_entry_get_prev(s->tree, te);
7384 		}
7385 		if (n > 0)
7386 			s->selected = n - 1;
7387 		break;
7388 	}
7389 	case 'k':
7390 	case KEY_UP:
7391 	case CTRL('p'):
7392 		if (s->selected > 0) {
7393 			s->selected--;
7394 			break;
7395 		}
7396 		tree_scroll_up(s, 1);
7397 		if (s->selected_entry == NULL ||
7398 		    (s->tree == s->root && s->selected_entry ==
7399 		     got_object_tree_get_first_entry(s->tree)))
7400 			view->count = 0;
7401 		break;
7402 	case CTRL('u'):
7403 	case 'u':
7404 		nscroll /= 2;
7405 		/* FALL THROUGH */
7406 	case KEY_PPAGE:
7407 	case CTRL('b'):
7408 	case 'b':
7409 		if (s->tree == s->root) {
7410 			if (got_object_tree_get_first_entry(s->tree) ==
7411 			    s->first_displayed_entry)
7412 				s->selected -= MIN(s->selected, nscroll);
7413 		} else {
7414 			if (s->first_displayed_entry == NULL)
7415 				s->selected -= MIN(s->selected, nscroll);
7416 		}
7417 		tree_scroll_up(s, MAX(0, nscroll));
7418 		if (s->selected_entry == NULL ||
7419 		    (s->tree == s->root && s->selected_entry ==
7420 		     got_object_tree_get_first_entry(s->tree)))
7421 			view->count = 0;
7422 		break;
7423 	case 'j':
7424 	case KEY_DOWN:
7425 	case CTRL('n'):
7426 		if (s->selected < s->ndisplayed - 1) {
7427 			s->selected++;
7428 			break;
7429 		}
7430 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7431 		    == NULL) {
7432 			/* can't scroll any further */
7433 			view->count = 0;
7434 			break;
7435 		}
7436 		tree_scroll_down(view, 1);
7437 		break;
7438 	case CTRL('d'):
7439 	case 'd':
7440 		nscroll /= 2;
7441 		/* FALL THROUGH */
7442 	case KEY_NPAGE:
7443 	case CTRL('f'):
7444 	case 'f':
7445 	case ' ':
7446 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7447 		    == NULL) {
7448 			/* can't scroll any further; move cursor down */
7449 			if (s->selected < s->ndisplayed - 1)
7450 				s->selected += MIN(nscroll,
7451 				    s->ndisplayed - s->selected - 1);
7452 			else
7453 				view->count = 0;
7454 			break;
7455 		}
7456 		tree_scroll_down(view, nscroll);
7457 		break;
7458 	case KEY_ENTER:
7459 	case '\r':
7460 	case KEY_BACKSPACE:
7461 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7462 			struct tog_parent_tree *parent;
7463 			/* user selected '..' */
7464 			if (s->tree == s->root) {
7465 				view->count = 0;
7466 				break;
7467 			}
7468 			parent = TAILQ_FIRST(&s->parents);
7469 			TAILQ_REMOVE(&s->parents, parent,
7470 			    entry);
7471 			got_object_tree_close(s->tree);
7472 			s->tree = parent->tree;
7473 			s->first_displayed_entry =
7474 			    parent->first_displayed_entry;
7475 			s->selected_entry =
7476 			    parent->selected_entry;
7477 			s->selected = parent->selected;
7478 			if (s->selected > view->nlines - 3) {
7479 				err = offset_selection_down(view);
7480 				if (err)
7481 					break;
7482 			}
7483 			free(parent);
7484 		} else if (S_ISDIR(got_tree_entry_get_mode(
7485 		    s->selected_entry))) {
7486 			struct got_tree_object *subtree;
7487 			view->count = 0;
7488 			err = got_object_open_as_tree(&subtree, s->repo,
7489 			    got_tree_entry_get_id(s->selected_entry));
7490 			if (err)
7491 				break;
7492 			err = tree_view_visit_subtree(s, subtree);
7493 			if (err) {
7494 				got_object_tree_close(subtree);
7495 				break;
7496 			}
7497 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7498 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7499 		break;
7500 	case KEY_RESIZE:
7501 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7502 			s->selected = view->nlines - 4;
7503 		view->count = 0;
7504 		break;
7505 	default:
7506 		view->count = 0;
7507 		break;
7508 	}
7509 
7510 	return err;
7511 }
7512 
7513 __dead static void
7514 usage_tree(void)
7515 {
7516 	endwin();
7517 	fprintf(stderr,
7518 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7519 	    getprogname());
7520 	exit(1);
7521 }
7522 
7523 static const struct got_error *
7524 cmd_tree(int argc, char *argv[])
7525 {
7526 	const struct got_error *error;
7527 	struct got_repository *repo = NULL;
7528 	struct got_worktree *worktree = NULL;
7529 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7530 	struct got_object_id *commit_id = NULL;
7531 	struct got_commit_object *commit = NULL;
7532 	const char *commit_id_arg = NULL;
7533 	char *label = NULL;
7534 	struct got_reference *ref = NULL;
7535 	const char *head_ref_name = NULL;
7536 	int ch;
7537 	struct tog_view *view;
7538 	int *pack_fds = NULL;
7539 
7540 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7541 		switch (ch) {
7542 		case 'c':
7543 			commit_id_arg = optarg;
7544 			break;
7545 		case 'r':
7546 			repo_path = realpath(optarg, NULL);
7547 			if (repo_path == NULL)
7548 				return got_error_from_errno2("realpath",
7549 				    optarg);
7550 			break;
7551 		default:
7552 			usage_tree();
7553 			/* NOTREACHED */
7554 		}
7555 	}
7556 
7557 	argc -= optind;
7558 	argv += optind;
7559 
7560 	if (argc > 1)
7561 		usage_tree();
7562 
7563 	error = got_repo_pack_fds_open(&pack_fds);
7564 	if (error != NULL)
7565 		goto done;
7566 
7567 	if (repo_path == NULL) {
7568 		cwd = getcwd(NULL, 0);
7569 		if (cwd == NULL)
7570 			return got_error_from_errno("getcwd");
7571 		error = got_worktree_open(&worktree, cwd);
7572 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7573 			goto done;
7574 		if (worktree)
7575 			repo_path =
7576 			    strdup(got_worktree_get_repo_path(worktree));
7577 		else
7578 			repo_path = strdup(cwd);
7579 		if (repo_path == NULL) {
7580 			error = got_error_from_errno("strdup");
7581 			goto done;
7582 		}
7583 	}
7584 
7585 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7586 	if (error != NULL)
7587 		goto done;
7588 
7589 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7590 	    repo, worktree);
7591 	if (error)
7592 		goto done;
7593 
7594 	init_curses();
7595 
7596 	error = apply_unveil(got_repo_get_path(repo), NULL);
7597 	if (error)
7598 		goto done;
7599 
7600 	error = tog_load_refs(repo, 0);
7601 	if (error)
7602 		goto done;
7603 
7604 	if (commit_id_arg == NULL) {
7605 		error = got_repo_match_object_id(&commit_id, &label,
7606 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7607 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7608 		if (error)
7609 			goto done;
7610 		head_ref_name = label;
7611 	} else {
7612 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7613 		if (error == NULL)
7614 			head_ref_name = got_ref_get_name(ref);
7615 		else if (error->code != GOT_ERR_NOT_REF)
7616 			goto done;
7617 		error = got_repo_match_object_id(&commit_id, NULL,
7618 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7619 		if (error)
7620 			goto done;
7621 	}
7622 
7623 	error = got_object_open_as_commit(&commit, repo, commit_id);
7624 	if (error)
7625 		goto done;
7626 
7627 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7628 	if (view == NULL) {
7629 		error = got_error_from_errno("view_open");
7630 		goto done;
7631 	}
7632 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7633 	if (error)
7634 		goto done;
7635 	if (!got_path_is_root_dir(in_repo_path)) {
7636 		error = tree_view_walk_path(&view->state.tree, commit,
7637 		    in_repo_path);
7638 		if (error)
7639 			goto done;
7640 	}
7641 
7642 	if (worktree) {
7643 		/* Release work tree lock. */
7644 		got_worktree_close(worktree);
7645 		worktree = NULL;
7646 	}
7647 	error = view_loop(view);
7648 done:
7649 	free(repo_path);
7650 	free(cwd);
7651 	free(commit_id);
7652 	free(label);
7653 	if (ref)
7654 		got_ref_close(ref);
7655 	if (repo) {
7656 		const struct got_error *close_err = got_repo_close(repo);
7657 		if (error == NULL)
7658 			error = close_err;
7659 	}
7660 	if (pack_fds) {
7661 		const struct got_error *pack_err =
7662 		    got_repo_pack_fds_close(pack_fds);
7663 		if (error == NULL)
7664 			error = pack_err;
7665 	}
7666 	tog_free_refs();
7667 	return error;
7668 }
7669 
7670 static const struct got_error *
7671 ref_view_load_refs(struct tog_ref_view_state *s)
7672 {
7673 	struct got_reflist_entry *sre;
7674 	struct tog_reflist_entry *re;
7675 
7676 	s->nrefs = 0;
7677 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7678 		if (strncmp(got_ref_get_name(sre->ref),
7679 		    "refs/got/", 9) == 0 &&
7680 		    strncmp(got_ref_get_name(sre->ref),
7681 		    "refs/got/backup/", 16) != 0)
7682 			continue;
7683 
7684 		re = malloc(sizeof(*re));
7685 		if (re == NULL)
7686 			return got_error_from_errno("malloc");
7687 
7688 		re->ref = got_ref_dup(sre->ref);
7689 		if (re->ref == NULL)
7690 			return got_error_from_errno("got_ref_dup");
7691 		re->idx = s->nrefs++;
7692 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7693 	}
7694 
7695 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7696 	return NULL;
7697 }
7698 
7699 static void
7700 ref_view_free_refs(struct tog_ref_view_state *s)
7701 {
7702 	struct tog_reflist_entry *re;
7703 
7704 	while (!TAILQ_EMPTY(&s->refs)) {
7705 		re = TAILQ_FIRST(&s->refs);
7706 		TAILQ_REMOVE(&s->refs, re, entry);
7707 		got_ref_close(re->ref);
7708 		free(re);
7709 	}
7710 }
7711 
7712 static const struct got_error *
7713 open_ref_view(struct tog_view *view, struct got_repository *repo)
7714 {
7715 	const struct got_error *err = NULL;
7716 	struct tog_ref_view_state *s = &view->state.ref;
7717 
7718 	s->selected_entry = 0;
7719 	s->repo = repo;
7720 
7721 	TAILQ_INIT(&s->refs);
7722 	STAILQ_INIT(&s->colors);
7723 
7724 	err = ref_view_load_refs(s);
7725 	if (err)
7726 		return err;
7727 
7728 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7729 		err = add_color(&s->colors, "^refs/heads/",
7730 		    TOG_COLOR_REFS_HEADS,
7731 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7732 		if (err)
7733 			goto done;
7734 
7735 		err = add_color(&s->colors, "^refs/tags/",
7736 		    TOG_COLOR_REFS_TAGS,
7737 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7738 		if (err)
7739 			goto done;
7740 
7741 		err = add_color(&s->colors, "^refs/remotes/",
7742 		    TOG_COLOR_REFS_REMOTES,
7743 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7744 		if (err)
7745 			goto done;
7746 
7747 		err = add_color(&s->colors, "^refs/got/backup/",
7748 		    TOG_COLOR_REFS_BACKUP,
7749 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7750 		if (err)
7751 			goto done;
7752 	}
7753 
7754 	view->show = show_ref_view;
7755 	view->input = input_ref_view;
7756 	view->close = close_ref_view;
7757 	view->search_start = search_start_ref_view;
7758 	view->search_next = search_next_ref_view;
7759 done:
7760 	if (err)
7761 		free_colors(&s->colors);
7762 	return err;
7763 }
7764 
7765 static const struct got_error *
7766 close_ref_view(struct tog_view *view)
7767 {
7768 	struct tog_ref_view_state *s = &view->state.ref;
7769 
7770 	ref_view_free_refs(s);
7771 	free_colors(&s->colors);
7772 
7773 	return NULL;
7774 }
7775 
7776 static const struct got_error *
7777 resolve_reflist_entry(struct got_object_id **commit_id,
7778     struct tog_reflist_entry *re, struct got_repository *repo)
7779 {
7780 	const struct got_error *err = NULL;
7781 	struct got_object_id *obj_id;
7782 	struct got_tag_object *tag = NULL;
7783 	int obj_type;
7784 
7785 	*commit_id = NULL;
7786 
7787 	err = got_ref_resolve(&obj_id, repo, re->ref);
7788 	if (err)
7789 		return err;
7790 
7791 	err = got_object_get_type(&obj_type, repo, obj_id);
7792 	if (err)
7793 		goto done;
7794 
7795 	switch (obj_type) {
7796 	case GOT_OBJ_TYPE_COMMIT:
7797 		*commit_id = obj_id;
7798 		break;
7799 	case GOT_OBJ_TYPE_TAG:
7800 		err = got_object_open_as_tag(&tag, repo, obj_id);
7801 		if (err)
7802 			goto done;
7803 		free(obj_id);
7804 		err = got_object_get_type(&obj_type, repo,
7805 		    got_object_tag_get_object_id(tag));
7806 		if (err)
7807 			goto done;
7808 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7809 			err = got_error(GOT_ERR_OBJ_TYPE);
7810 			goto done;
7811 		}
7812 		*commit_id = got_object_id_dup(
7813 		    got_object_tag_get_object_id(tag));
7814 		if (*commit_id == NULL) {
7815 			err = got_error_from_errno("got_object_id_dup");
7816 			goto done;
7817 		}
7818 		break;
7819 	default:
7820 		err = got_error(GOT_ERR_OBJ_TYPE);
7821 		break;
7822 	}
7823 
7824 done:
7825 	if (tag)
7826 		got_object_tag_close(tag);
7827 	if (err) {
7828 		free(*commit_id);
7829 		*commit_id = NULL;
7830 	}
7831 	return err;
7832 }
7833 
7834 static const struct got_error *
7835 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7836     struct tog_reflist_entry *re, struct got_repository *repo)
7837 {
7838 	struct tog_view *log_view;
7839 	const struct got_error *err = NULL;
7840 	struct got_object_id *commit_id = NULL;
7841 
7842 	*new_view = NULL;
7843 
7844 	err = resolve_reflist_entry(&commit_id, re, repo);
7845 	if (err) {
7846 		if (err->code != GOT_ERR_OBJ_TYPE)
7847 			return err;
7848 		else
7849 			return NULL;
7850 	}
7851 
7852 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7853 	if (log_view == NULL) {
7854 		err = got_error_from_errno("view_open");
7855 		goto done;
7856 	}
7857 
7858 	err = open_log_view(log_view, commit_id, repo,
7859 	    got_ref_get_name(re->ref), "", 0);
7860 done:
7861 	if (err)
7862 		view_close(log_view);
7863 	else
7864 		*new_view = log_view;
7865 	free(commit_id);
7866 	return err;
7867 }
7868 
7869 static void
7870 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7871 {
7872 	struct tog_reflist_entry *re;
7873 	int i = 0;
7874 
7875 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7876 		return;
7877 
7878 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7879 	while (i++ < maxscroll) {
7880 		if (re == NULL)
7881 			break;
7882 		s->first_displayed_entry = re;
7883 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7884 	}
7885 }
7886 
7887 static const struct got_error *
7888 ref_scroll_down(struct tog_view *view, int maxscroll)
7889 {
7890 	struct tog_ref_view_state *s = &view->state.ref;
7891 	struct tog_reflist_entry *next, *last;
7892 	int n = 0;
7893 
7894 	if (s->first_displayed_entry)
7895 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7896 	else
7897 		next = TAILQ_FIRST(&s->refs);
7898 
7899 	last = s->last_displayed_entry;
7900 	while (next && n++ < maxscroll) {
7901 		if (last) {
7902 			s->last_displayed_entry = last;
7903 			last = TAILQ_NEXT(last, entry);
7904 		}
7905 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7906 			s->first_displayed_entry = next;
7907 			next = TAILQ_NEXT(next, entry);
7908 		}
7909 	}
7910 
7911 	return NULL;
7912 }
7913 
7914 static const struct got_error *
7915 search_start_ref_view(struct tog_view *view)
7916 {
7917 	struct tog_ref_view_state *s = &view->state.ref;
7918 
7919 	s->matched_entry = NULL;
7920 	return NULL;
7921 }
7922 
7923 static int
7924 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7925 {
7926 	regmatch_t regmatch;
7927 
7928 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7929 	    0) == 0;
7930 }
7931 
7932 static const struct got_error *
7933 search_next_ref_view(struct tog_view *view)
7934 {
7935 	struct tog_ref_view_state *s = &view->state.ref;
7936 	struct tog_reflist_entry *re = NULL;
7937 
7938 	if (!view->searching) {
7939 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7940 		return NULL;
7941 	}
7942 
7943 	if (s->matched_entry) {
7944 		if (view->searching == TOG_SEARCH_FORWARD) {
7945 			if (s->selected_entry)
7946 				re = TAILQ_NEXT(s->selected_entry, entry);
7947 			else
7948 				re = TAILQ_PREV(s->selected_entry,
7949 				    tog_reflist_head, entry);
7950 		} else {
7951 			if (s->selected_entry == NULL)
7952 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7953 			else
7954 				re = TAILQ_PREV(s->selected_entry,
7955 				    tog_reflist_head, entry);
7956 		}
7957 	} else {
7958 		if (s->selected_entry)
7959 			re = s->selected_entry;
7960 		else if (view->searching == TOG_SEARCH_FORWARD)
7961 			re = TAILQ_FIRST(&s->refs);
7962 		else
7963 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7964 	}
7965 
7966 	while (1) {
7967 		if (re == NULL) {
7968 			if (s->matched_entry == NULL) {
7969 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7970 				return NULL;
7971 			}
7972 			if (view->searching == TOG_SEARCH_FORWARD)
7973 				re = TAILQ_FIRST(&s->refs);
7974 			else
7975 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7976 		}
7977 
7978 		if (match_reflist_entry(re, &view->regex)) {
7979 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7980 			s->matched_entry = re;
7981 			break;
7982 		}
7983 
7984 		if (view->searching == TOG_SEARCH_FORWARD)
7985 			re = TAILQ_NEXT(re, entry);
7986 		else
7987 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7988 	}
7989 
7990 	if (s->matched_entry) {
7991 		s->first_displayed_entry = s->matched_entry;
7992 		s->selected = 0;
7993 	}
7994 
7995 	return NULL;
7996 }
7997 
7998 static const struct got_error *
7999 show_ref_view(struct tog_view *view)
8000 {
8001 	const struct got_error *err = NULL;
8002 	struct tog_ref_view_state *s = &view->state.ref;
8003 	struct tog_reflist_entry *re;
8004 	char *line = NULL;
8005 	wchar_t *wline;
8006 	struct tog_color *tc;
8007 	int width, n;
8008 	int limit = view->nlines;
8009 
8010 	werase(view->window);
8011 
8012 	s->ndisplayed = 0;
8013 	if (view_is_hsplit_top(view))
8014 		--limit;  /* border */
8015 
8016 	if (limit == 0)
8017 		return NULL;
8018 
8019 	re = s->first_displayed_entry;
8020 
8021 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8022 	    s->nrefs) == -1)
8023 		return got_error_from_errno("asprintf");
8024 
8025 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8026 	if (err) {
8027 		free(line);
8028 		return err;
8029 	}
8030 	if (view_needs_focus_indication(view))
8031 		wstandout(view->window);
8032 	waddwstr(view->window, wline);
8033 	while (width++ < view->ncols)
8034 		waddch(view->window, ' ');
8035 	if (view_needs_focus_indication(view))
8036 		wstandend(view->window);
8037 	free(wline);
8038 	wline = NULL;
8039 	free(line);
8040 	line = NULL;
8041 	if (--limit <= 0)
8042 		return NULL;
8043 
8044 	n = 0;
8045 	while (re && limit > 0) {
8046 		char *line = NULL;
8047 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8048 
8049 		if (s->show_date) {
8050 			struct got_commit_object *ci;
8051 			struct got_tag_object *tag;
8052 			struct got_object_id *id;
8053 			struct tm tm;
8054 			time_t t;
8055 
8056 			err = got_ref_resolve(&id, s->repo, re->ref);
8057 			if (err)
8058 				return err;
8059 			err = got_object_open_as_tag(&tag, s->repo, id);
8060 			if (err) {
8061 				if (err->code != GOT_ERR_OBJ_TYPE) {
8062 					free(id);
8063 					return err;
8064 				}
8065 				err = got_object_open_as_commit(&ci, s->repo,
8066 				    id);
8067 				if (err) {
8068 					free(id);
8069 					return err;
8070 				}
8071 				t = got_object_commit_get_committer_time(ci);
8072 				got_object_commit_close(ci);
8073 			} else {
8074 				t = got_object_tag_get_tagger_time(tag);
8075 				got_object_tag_close(tag);
8076 			}
8077 			free(id);
8078 			if (gmtime_r(&t, &tm) == NULL)
8079 				return got_error_from_errno("gmtime_r");
8080 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8081 				return got_error(GOT_ERR_NO_SPACE);
8082 		}
8083 		if (got_ref_is_symbolic(re->ref)) {
8084 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8085 			    ymd : "", got_ref_get_name(re->ref),
8086 			    got_ref_get_symref_target(re->ref)) == -1)
8087 				return got_error_from_errno("asprintf");
8088 		} else if (s->show_ids) {
8089 			struct got_object_id *id;
8090 			char *id_str;
8091 			err = got_ref_resolve(&id, s->repo, re->ref);
8092 			if (err)
8093 				return err;
8094 			err = got_object_id_str(&id_str, id);
8095 			if (err) {
8096 				free(id);
8097 				return err;
8098 			}
8099 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8100 			    got_ref_get_name(re->ref), id_str) == -1) {
8101 				err = got_error_from_errno("asprintf");
8102 				free(id);
8103 				free(id_str);
8104 				return err;
8105 			}
8106 			free(id);
8107 			free(id_str);
8108 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8109 		    got_ref_get_name(re->ref)) == -1)
8110 			return got_error_from_errno("asprintf");
8111 
8112 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8113 		    0, 0);
8114 		if (err) {
8115 			free(line);
8116 			return err;
8117 		}
8118 		if (n == s->selected) {
8119 			if (view->focussed)
8120 				wstandout(view->window);
8121 			s->selected_entry = re;
8122 		}
8123 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8124 		if (tc)
8125 			wattr_on(view->window,
8126 			    COLOR_PAIR(tc->colorpair), NULL);
8127 		waddwstr(view->window, wline);
8128 		if (tc)
8129 			wattr_off(view->window,
8130 			    COLOR_PAIR(tc->colorpair), NULL);
8131 		if (width < view->ncols - 1)
8132 			waddch(view->window, '\n');
8133 		if (n == s->selected && view->focussed)
8134 			wstandend(view->window);
8135 		free(line);
8136 		free(wline);
8137 		wline = NULL;
8138 		n++;
8139 		s->ndisplayed++;
8140 		s->last_displayed_entry = re;
8141 
8142 		limit--;
8143 		re = TAILQ_NEXT(re, entry);
8144 	}
8145 
8146 	view_border(view);
8147 	return err;
8148 }
8149 
8150 static const struct got_error *
8151 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8152     struct tog_reflist_entry *re, struct got_repository *repo)
8153 {
8154 	const struct got_error *err = NULL;
8155 	struct got_object_id *commit_id = NULL;
8156 	struct tog_view *tree_view;
8157 
8158 	*new_view = NULL;
8159 
8160 	err = resolve_reflist_entry(&commit_id, re, repo);
8161 	if (err) {
8162 		if (err->code != GOT_ERR_OBJ_TYPE)
8163 			return err;
8164 		else
8165 			return NULL;
8166 	}
8167 
8168 
8169 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8170 	if (tree_view == NULL) {
8171 		err = got_error_from_errno("view_open");
8172 		goto done;
8173 	}
8174 
8175 	err = open_tree_view(tree_view, commit_id,
8176 	    got_ref_get_name(re->ref), repo);
8177 	if (err)
8178 		goto done;
8179 
8180 	*new_view = tree_view;
8181 done:
8182 	free(commit_id);
8183 	return err;
8184 }
8185 
8186 static const struct got_error *
8187 ref_goto_line(struct tog_view *view, int nlines)
8188 {
8189 	const struct got_error		*err = NULL;
8190 	struct tog_ref_view_state	*s = &view->state.ref;
8191 	int				 g, idx = s->selected_entry->idx;
8192 
8193 	g = view->gline;
8194 	view->gline = 0;
8195 
8196 	if (g == 0)
8197 		g = 1;
8198 	else if (g > s->nrefs)
8199 		g = s->nrefs;
8200 
8201 	if (g >= s->first_displayed_entry->idx + 1 &&
8202 	    g <= s->last_displayed_entry->idx + 1 &&
8203 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8204 		s->selected = g - s->first_displayed_entry->idx - 1;
8205 		return NULL;
8206 	}
8207 
8208 	if (idx + 1 < g) {
8209 		err = ref_scroll_down(view, g - idx - 1);
8210 		if (err)
8211 			return err;
8212 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8213 		    s->first_displayed_entry->idx + s->selected < g &&
8214 		    s->selected < s->ndisplayed - 1)
8215 			s->selected = g - s->first_displayed_entry->idx - 1;
8216 	} else if (idx + 1 > g)
8217 		ref_scroll_up(s, idx - g + 1);
8218 
8219 	if (g < nlines && s->first_displayed_entry->idx == 0)
8220 		s->selected = g - 1;
8221 
8222 	return NULL;
8223 
8224 }
8225 
8226 static const struct got_error *
8227 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8228 {
8229 	const struct got_error *err = NULL;
8230 	struct tog_ref_view_state *s = &view->state.ref;
8231 	struct tog_reflist_entry *re;
8232 	int n, nscroll = view->nlines - 1;
8233 
8234 	if (view->gline)
8235 		return ref_goto_line(view, nscroll);
8236 
8237 	switch (ch) {
8238 	case 'i':
8239 		s->show_ids = !s->show_ids;
8240 		view->count = 0;
8241 		break;
8242 	case 'm':
8243 		s->show_date = !s->show_date;
8244 		view->count = 0;
8245 		break;
8246 	case 'o':
8247 		s->sort_by_date = !s->sort_by_date;
8248 		view->count = 0;
8249 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8250 		    got_ref_cmp_by_commit_timestamp_descending :
8251 		    tog_ref_cmp_by_name, s->repo);
8252 		if (err)
8253 			break;
8254 		got_reflist_object_id_map_free(tog_refs_idmap);
8255 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8256 		    &tog_refs, s->repo);
8257 		if (err)
8258 			break;
8259 		ref_view_free_refs(s);
8260 		err = ref_view_load_refs(s);
8261 		break;
8262 	case KEY_ENTER:
8263 	case '\r':
8264 		view->count = 0;
8265 		if (!s->selected_entry)
8266 			break;
8267 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8268 		break;
8269 	case 'T':
8270 		view->count = 0;
8271 		if (!s->selected_entry)
8272 			break;
8273 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8274 		break;
8275 	case 'g':
8276 	case '=':
8277 	case KEY_HOME:
8278 		s->selected = 0;
8279 		view->count = 0;
8280 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8281 		break;
8282 	case 'G':
8283 	case '*':
8284 	case KEY_END: {
8285 		int eos = view->nlines - 1;
8286 
8287 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8288 			--eos;  /* border */
8289 		s->selected = 0;
8290 		view->count = 0;
8291 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8292 		for (n = 0; n < eos; n++) {
8293 			if (re == NULL)
8294 				break;
8295 			s->first_displayed_entry = re;
8296 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8297 		}
8298 		if (n > 0)
8299 			s->selected = n - 1;
8300 		break;
8301 	}
8302 	case 'k':
8303 	case KEY_UP:
8304 	case CTRL('p'):
8305 		if (s->selected > 0) {
8306 			s->selected--;
8307 			break;
8308 		}
8309 		ref_scroll_up(s, 1);
8310 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8311 			view->count = 0;
8312 		break;
8313 	case CTRL('u'):
8314 	case 'u':
8315 		nscroll /= 2;
8316 		/* FALL THROUGH */
8317 	case KEY_PPAGE:
8318 	case CTRL('b'):
8319 	case 'b':
8320 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8321 			s->selected -= MIN(nscroll, s->selected);
8322 		ref_scroll_up(s, MAX(0, nscroll));
8323 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8324 			view->count = 0;
8325 		break;
8326 	case 'j':
8327 	case KEY_DOWN:
8328 	case CTRL('n'):
8329 		if (s->selected < s->ndisplayed - 1) {
8330 			s->selected++;
8331 			break;
8332 		}
8333 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8334 			/* can't scroll any further */
8335 			view->count = 0;
8336 			break;
8337 		}
8338 		ref_scroll_down(view, 1);
8339 		break;
8340 	case CTRL('d'):
8341 	case 'd':
8342 		nscroll /= 2;
8343 		/* FALL THROUGH */
8344 	case KEY_NPAGE:
8345 	case CTRL('f'):
8346 	case 'f':
8347 	case ' ':
8348 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8349 			/* can't scroll any further; move cursor down */
8350 			if (s->selected < s->ndisplayed - 1)
8351 				s->selected += MIN(nscroll,
8352 				    s->ndisplayed - s->selected - 1);
8353 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8354 				s->selected += s->ndisplayed - s->selected - 1;
8355 			view->count = 0;
8356 			break;
8357 		}
8358 		ref_scroll_down(view, nscroll);
8359 		break;
8360 	case CTRL('l'):
8361 		view->count = 0;
8362 		tog_free_refs();
8363 		err = tog_load_refs(s->repo, s->sort_by_date);
8364 		if (err)
8365 			break;
8366 		ref_view_free_refs(s);
8367 		err = ref_view_load_refs(s);
8368 		break;
8369 	case KEY_RESIZE:
8370 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8371 			s->selected = view->nlines - 2;
8372 		break;
8373 	default:
8374 		view->count = 0;
8375 		break;
8376 	}
8377 
8378 	return err;
8379 }
8380 
8381 __dead static void
8382 usage_ref(void)
8383 {
8384 	endwin();
8385 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8386 	    getprogname());
8387 	exit(1);
8388 }
8389 
8390 static const struct got_error *
8391 cmd_ref(int argc, char *argv[])
8392 {
8393 	const struct got_error *error;
8394 	struct got_repository *repo = NULL;
8395 	struct got_worktree *worktree = NULL;
8396 	char *cwd = NULL, *repo_path = NULL;
8397 	int ch;
8398 	struct tog_view *view;
8399 	int *pack_fds = NULL;
8400 
8401 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8402 		switch (ch) {
8403 		case 'r':
8404 			repo_path = realpath(optarg, NULL);
8405 			if (repo_path == NULL)
8406 				return got_error_from_errno2("realpath",
8407 				    optarg);
8408 			break;
8409 		default:
8410 			usage_ref();
8411 			/* NOTREACHED */
8412 		}
8413 	}
8414 
8415 	argc -= optind;
8416 	argv += optind;
8417 
8418 	if (argc > 1)
8419 		usage_ref();
8420 
8421 	error = got_repo_pack_fds_open(&pack_fds);
8422 	if (error != NULL)
8423 		goto done;
8424 
8425 	if (repo_path == NULL) {
8426 		cwd = getcwd(NULL, 0);
8427 		if (cwd == NULL)
8428 			return got_error_from_errno("getcwd");
8429 		error = got_worktree_open(&worktree, cwd);
8430 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8431 			goto done;
8432 		if (worktree)
8433 			repo_path =
8434 			    strdup(got_worktree_get_repo_path(worktree));
8435 		else
8436 			repo_path = strdup(cwd);
8437 		if (repo_path == NULL) {
8438 			error = got_error_from_errno("strdup");
8439 			goto done;
8440 		}
8441 	}
8442 
8443 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8444 	if (error != NULL)
8445 		goto done;
8446 
8447 	init_curses();
8448 
8449 	error = apply_unveil(got_repo_get_path(repo), NULL);
8450 	if (error)
8451 		goto done;
8452 
8453 	error = tog_load_refs(repo, 0);
8454 	if (error)
8455 		goto done;
8456 
8457 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8458 	if (view == NULL) {
8459 		error = got_error_from_errno("view_open");
8460 		goto done;
8461 	}
8462 
8463 	error = open_ref_view(view, repo);
8464 	if (error)
8465 		goto done;
8466 
8467 	if (worktree) {
8468 		/* Release work tree lock. */
8469 		got_worktree_close(worktree);
8470 		worktree = NULL;
8471 	}
8472 	error = view_loop(view);
8473 done:
8474 	free(repo_path);
8475 	free(cwd);
8476 	if (repo) {
8477 		const struct got_error *close_err = got_repo_close(repo);
8478 		if (close_err)
8479 			error = close_err;
8480 	}
8481 	if (pack_fds) {
8482 		const struct got_error *pack_err =
8483 		    got_repo_pack_fds_close(pack_fds);
8484 		if (error == NULL)
8485 			error = pack_err;
8486 	}
8487 	tog_free_refs();
8488 	return error;
8489 }
8490 
8491 static const struct got_error*
8492 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8493     const char *str)
8494 {
8495 	size_t len;
8496 
8497 	if (win == NULL)
8498 		win = stdscr;
8499 
8500 	len = strlen(str);
8501 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8502 
8503 	if (focus)
8504 		wstandout(win);
8505 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8506 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8507 	if (focus)
8508 		wstandend(win);
8509 
8510 	return NULL;
8511 }
8512 
8513 static const struct got_error *
8514 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8515 {
8516 	off_t *p;
8517 
8518 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8519 	if (p == NULL) {
8520 		free(*line_offsets);
8521 		*line_offsets = NULL;
8522 		return got_error_from_errno("reallocarray");
8523 	}
8524 
8525 	*line_offsets = p;
8526 	(*line_offsets)[*nlines] = off;
8527 	++(*nlines);
8528 	return NULL;
8529 }
8530 
8531 static const struct got_error *
8532 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8533 {
8534 	*ret = 0;
8535 
8536 	for (;n > 0; --n, ++km) {
8537 		char	*t0, *t, *k;
8538 		size_t	 len = 1;
8539 
8540 		if (km->keys == NULL)
8541 			continue;
8542 
8543 		t = t0 = strdup(km->keys);
8544 		if (t0 == NULL)
8545 			return got_error_from_errno("strdup");
8546 
8547 		len += strlen(t);
8548 		while ((k = strsep(&t, " ")) != NULL)
8549 			len += strlen(k) > 1 ? 2 : 0;
8550 		free(t0);
8551 		*ret = MAX(*ret, len);
8552 	}
8553 
8554 	return NULL;
8555 }
8556 
8557 /*
8558  * Write keymap section headers, keys, and key info in km to f.
8559  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8560  * wrap control and symbolic keys in guillemets, else use <>.
8561  */
8562 static const struct got_error *
8563 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8564 {
8565 	int n, len = width;
8566 
8567 	if (km->keys) {
8568 		static const char *u8_glyph[] = {
8569 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8570 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8571 		};
8572 		char	*t0, *t, *k;
8573 		int	 cs, s, first = 1;
8574 
8575 		cs = got_locale_is_utf8();
8576 
8577 		t = t0 = strdup(km->keys);
8578 		if (t0 == NULL)
8579 			return got_error_from_errno("strdup");
8580 
8581 		len = strlen(km->keys);
8582 		while ((k = strsep(&t, " ")) != NULL) {
8583 			s = strlen(k) > 1;  /* control or symbolic key */
8584 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8585 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8586 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8587 			if (n < 0) {
8588 				free(t0);
8589 				return got_error_from_errno("fprintf");
8590 			}
8591 			first = 0;
8592 			len += s ? 2 : 0;
8593 			*off += n;
8594 		}
8595 		free(t0);
8596 	}
8597 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8598 	if (n < 0)
8599 		return got_error_from_errno("fprintf");
8600 	*off += n;
8601 
8602 	return NULL;
8603 }
8604 
8605 static const struct got_error *
8606 format_help(struct tog_help_view_state *s)
8607 {
8608 	const struct got_error		*err = NULL;
8609 	off_t				 off = 0;
8610 	int				 i, max, n, show = s->all;
8611 	static const struct tog_key_map	 km[] = {
8612 #define KEYMAP_(info, type)	{ NULL, (info), type }
8613 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8614 		GENERATE_HELP
8615 #undef KEYMAP_
8616 #undef KEY_
8617 	};
8618 
8619 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8620 	if (err)
8621 		return err;
8622 
8623 	n = nitems(km);
8624 	err = max_key_str(&max, km, n);
8625 	if (err)
8626 		return err;
8627 
8628 	for (i = 0; i < n; ++i) {
8629 		if (km[i].keys == NULL) {
8630 			show = s->all;
8631 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8632 			    km[i].type == s->type || s->all)
8633 				show = 1;
8634 		}
8635 		if (show) {
8636 			err = format_help_line(&off, s->f, &km[i], max);
8637 			if (err)
8638 				return err;
8639 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8640 			if (err)
8641 				return err;
8642 		}
8643 	}
8644 	fputc('\n', s->f);
8645 	++off;
8646 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8647 	return err;
8648 }
8649 
8650 static const struct got_error *
8651 create_help(struct tog_help_view_state *s)
8652 {
8653 	FILE			*f;
8654 	const struct got_error	*err;
8655 
8656 	free(s->line_offsets);
8657 	s->line_offsets = NULL;
8658 	s->nlines = 0;
8659 
8660 	f = got_opentemp();
8661 	if (f == NULL)
8662 		return got_error_from_errno("got_opentemp");
8663 	s->f = f;
8664 
8665 	err = format_help(s);
8666 	if (err)
8667 		return err;
8668 
8669 	if (s->f && fflush(s->f) != 0)
8670 		return got_error_from_errno("fflush");
8671 
8672 	return NULL;
8673 }
8674 
8675 static const struct got_error *
8676 search_start_help_view(struct tog_view *view)
8677 {
8678 	view->state.help.matched_line = 0;
8679 	return NULL;
8680 }
8681 
8682 static void
8683 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8684     size_t *nlines, int **first, int **last, int **match, int **selected)
8685 {
8686 	struct tog_help_view_state *s = &view->state.help;
8687 
8688 	*f = s->f;
8689 	*nlines = s->nlines;
8690 	*line_offsets = s->line_offsets;
8691 	*match = &s->matched_line;
8692 	*first = &s->first_displayed_line;
8693 	*last = &s->last_displayed_line;
8694 	*selected = &s->selected_line;
8695 }
8696 
8697 static const struct got_error *
8698 show_help_view(struct tog_view *view)
8699 {
8700 	struct tog_help_view_state	*s = &view->state.help;
8701 	const struct got_error		*err;
8702 	regmatch_t			*regmatch = &view->regmatch;
8703 	wchar_t				*wline;
8704 	char				*line;
8705 	ssize_t				 linelen;
8706 	size_t				 linesz = 0;
8707 	int				 width, nprinted = 0, rc = 0;
8708 	int				 eos = view->nlines;
8709 
8710 	if (view_is_hsplit_top(view))
8711 		--eos;  /* account for border */
8712 
8713 	s->lineno = 0;
8714 	rewind(s->f);
8715 	werase(view->window);
8716 
8717 	if (view->gline > s->nlines - 1)
8718 		view->gline = s->nlines - 1;
8719 
8720 	err = win_draw_center(view->window, 0, 0, view->ncols,
8721 	    view_needs_focus_indication(view),
8722 	    "tog help (press q to return to tog)");
8723 	if (err)
8724 		return err;
8725 	if (eos <= 1)
8726 		return NULL;
8727 	waddstr(view->window, "\n\n");
8728 	eos -= 2;
8729 
8730 	s->eof = 0;
8731 	view->maxx = 0;
8732 	line = NULL;
8733 	while (eos > 0 && nprinted < eos) {
8734 		attr_t attr = 0;
8735 
8736 		linelen = getline(&line, &linesz, s->f);
8737 		if (linelen == -1) {
8738 			if (!feof(s->f)) {
8739 				free(line);
8740 				return got_ferror(s->f, GOT_ERR_IO);
8741 			}
8742 			s->eof = 1;
8743 			break;
8744 		}
8745 		if (++s->lineno < s->first_displayed_line)
8746 			continue;
8747 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8748 			continue;
8749 		if (s->lineno == view->hiline)
8750 			attr = A_STANDOUT;
8751 
8752 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8753 		    view->x ? 1 : 0);
8754 		if (err) {
8755 			free(line);
8756 			return err;
8757 		}
8758 		view->maxx = MAX(view->maxx, width);
8759 		free(wline);
8760 		wline = NULL;
8761 
8762 		if (attr)
8763 			wattron(view->window, attr);
8764 		if (s->first_displayed_line + nprinted == s->matched_line &&
8765 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8766 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8767 			    view->window, view->x, regmatch);
8768 			if (err) {
8769 				free(line);
8770 				return err;
8771 			}
8772 		} else {
8773 			int skip;
8774 
8775 			err = format_line(&wline, &width, &skip, line,
8776 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8777 			if (err) {
8778 				free(line);
8779 				return err;
8780 			}
8781 			rc = waddwstr(view->window, &wline[skip]);
8782 			free(wline);
8783 			wline = NULL;
8784 			if (rc == ERR)
8785 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8786 		}
8787 		if (s->lineno == view->hiline) {
8788 			while (width++ < view->ncols)
8789 				waddch(view->window, ' ');
8790 		} else {
8791 			if (width <= view->ncols)
8792 				waddch(view->window, '\n');
8793 		}
8794 		if (attr)
8795 			wattroff(view->window, attr);
8796 		if (++nprinted == 1)
8797 			s->first_displayed_line = s->lineno;
8798 	}
8799 	free(line);
8800 	if (nprinted > 0)
8801 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8802 	else
8803 		s->last_displayed_line = s->first_displayed_line;
8804 
8805 	view_border(view);
8806 
8807 	if (s->eof) {
8808 		rc = waddnstr(view->window,
8809 		    "See the tog(1) manual page for full documentation",
8810 		    view->ncols - 1);
8811 		if (rc == ERR)
8812 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8813 	} else {
8814 		wmove(view->window, view->nlines - 1, 0);
8815 		wclrtoeol(view->window);
8816 		wstandout(view->window);
8817 		rc = waddnstr(view->window, "scroll down for more...",
8818 		    view->ncols - 1);
8819 		if (rc == ERR)
8820 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8821 		if (getcurx(view->window) < view->ncols - 6) {
8822 			rc = wprintw(view->window, "[%.0f%%]",
8823 			    100.00 * s->last_displayed_line / s->nlines);
8824 			if (rc == ERR)
8825 				return got_error_msg(GOT_ERR_IO, "wprintw");
8826 		}
8827 		wstandend(view->window);
8828 	}
8829 
8830 	return NULL;
8831 }
8832 
8833 static const struct got_error *
8834 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8835 {
8836 	struct tog_help_view_state	*s = &view->state.help;
8837 	const struct got_error		*err = NULL;
8838 	char				*line = NULL;
8839 	ssize_t				 linelen;
8840 	size_t				 linesz = 0;
8841 	int				 eos, nscroll;
8842 
8843 	eos = nscroll = view->nlines;
8844 	if (view_is_hsplit_top(view))
8845 		--eos;  /* border */
8846 
8847 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8848 
8849 	switch (ch) {
8850 	case '0':
8851 		view->x = 0;
8852 		break;
8853 	case '$':
8854 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8855 		view->count = 0;
8856 		break;
8857 	case KEY_RIGHT:
8858 	case 'l':
8859 		if (view->x + view->ncols / 3 < view->maxx)
8860 			view->x += 2;
8861 		else
8862 			view->count = 0;
8863 		break;
8864 	case KEY_LEFT:
8865 	case 'h':
8866 		view->x -= MIN(view->x, 2);
8867 		if (view->x <= 0)
8868 			view->count = 0;
8869 		break;
8870 	case 'g':
8871 	case KEY_HOME:
8872 		s->first_displayed_line = 1;
8873 		view->count = 0;
8874 		break;
8875 	case 'G':
8876 	case KEY_END:
8877 		view->count = 0;
8878 		if (s->eof)
8879 			break;
8880 		s->first_displayed_line = (s->nlines - eos) + 3;
8881 		s->eof = 1;
8882 		break;
8883 	case 'k':
8884 	case KEY_UP:
8885 		if (s->first_displayed_line > 1)
8886 			--s->first_displayed_line;
8887 		else
8888 			view->count = 0;
8889 		break;
8890 	case CTRL('u'):
8891 	case 'u':
8892 		nscroll /= 2;
8893 		/* FALL THROUGH */
8894 	case KEY_PPAGE:
8895 	case CTRL('b'):
8896 	case 'b':
8897 		if (s->first_displayed_line == 1) {
8898 			view->count = 0;
8899 			break;
8900 		}
8901 		while (--nscroll > 0 && s->first_displayed_line > 1)
8902 			s->first_displayed_line--;
8903 		break;
8904 	case 'j':
8905 	case KEY_DOWN:
8906 	case CTRL('n'):
8907 		if (!s->eof)
8908 			++s->first_displayed_line;
8909 		else
8910 			view->count = 0;
8911 		break;
8912 	case CTRL('d'):
8913 	case 'd':
8914 		nscroll /= 2;
8915 		/* FALL THROUGH */
8916 	case KEY_NPAGE:
8917 	case CTRL('f'):
8918 	case 'f':
8919 	case ' ':
8920 		if (s->eof) {
8921 			view->count = 0;
8922 			break;
8923 		}
8924 		while (!s->eof && --nscroll > 0) {
8925 			linelen = getline(&line, &linesz, s->f);
8926 			s->first_displayed_line++;
8927 			if (linelen == -1) {
8928 				if (feof(s->f))
8929 					s->eof = 1;
8930 				else
8931 					err = got_ferror(s->f, GOT_ERR_IO);
8932 				break;
8933 			}
8934 		}
8935 		free(line);
8936 		break;
8937 	default:
8938 		view->count = 0;
8939 		break;
8940 	}
8941 
8942 	return err;
8943 }
8944 
8945 static const struct got_error *
8946 close_help_view(struct tog_view *view)
8947 {
8948 	struct tog_help_view_state *s = &view->state.help;
8949 
8950 	free(s->line_offsets);
8951 	s->line_offsets = NULL;
8952 	if (fclose(s->f) == EOF)
8953 		return got_error_from_errno("fclose");
8954 
8955 	return NULL;
8956 }
8957 
8958 static const struct got_error *
8959 reset_help_view(struct tog_view *view)
8960 {
8961 	struct tog_help_view_state *s = &view->state.help;
8962 
8963 
8964 	if (s->f && fclose(s->f) == EOF)
8965 		return got_error_from_errno("fclose");
8966 
8967 	wclear(view->window);
8968 	view->count = 0;
8969 	view->x = 0;
8970 	s->all = !s->all;
8971 	s->first_displayed_line = 1;
8972 	s->last_displayed_line = view->nlines;
8973 	s->matched_line = 0;
8974 
8975 	return create_help(s);
8976 }
8977 
8978 static const struct got_error *
8979 open_help_view(struct tog_view *view, struct tog_view *parent)
8980 {
8981 	const struct got_error		*err = NULL;
8982 	struct tog_help_view_state	*s = &view->state.help;
8983 
8984 	s->type = (enum tog_keymap_type)parent->type;
8985 	s->first_displayed_line = 1;
8986 	s->last_displayed_line = view->nlines;
8987 	s->selected_line = 1;
8988 
8989 	view->show = show_help_view;
8990 	view->input = input_help_view;
8991 	view->reset = reset_help_view;
8992 	view->close = close_help_view;
8993 	view->search_start = search_start_help_view;
8994 	view->search_setup = search_setup_help_view;
8995 	view->search_next = search_next_view_match;
8996 
8997 	err = create_help(s);
8998 	return err;
8999 }
9000 
9001 static const struct got_error *
9002 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9003     enum tog_view_type request, int y, int x)
9004 {
9005 	const struct got_error *err = NULL;
9006 
9007 	*new_view = NULL;
9008 
9009 	switch (request) {
9010 	case TOG_VIEW_DIFF:
9011 		if (view->type == TOG_VIEW_LOG) {
9012 			struct tog_log_view_state *s = &view->state.log;
9013 
9014 			err = open_diff_view_for_commit(new_view, y, x,
9015 			    s->selected_entry->commit, s->selected_entry->id,
9016 			    view, s->repo);
9017 		} else
9018 			return got_error_msg(GOT_ERR_NOT_IMPL,
9019 			    "parent/child view pair not supported");
9020 		break;
9021 	case TOG_VIEW_BLAME:
9022 		if (view->type == TOG_VIEW_TREE) {
9023 			struct tog_tree_view_state *s = &view->state.tree;
9024 
9025 			err = blame_tree_entry(new_view, y, x,
9026 			    s->selected_entry, &s->parents, s->commit_id,
9027 			    s->repo);
9028 		} else
9029 			return got_error_msg(GOT_ERR_NOT_IMPL,
9030 			    "parent/child view pair not supported");
9031 		break;
9032 	case TOG_VIEW_LOG:
9033 		if (view->type == TOG_VIEW_BLAME)
9034 			err = log_annotated_line(new_view, y, x,
9035 			    view->state.blame.repo, view->state.blame.id_to_log);
9036 		else if (view->type == TOG_VIEW_TREE)
9037 			err = log_selected_tree_entry(new_view, y, x,
9038 			    &view->state.tree);
9039 		else if (view->type == TOG_VIEW_REF)
9040 			err = log_ref_entry(new_view, y, x,
9041 			    view->state.ref.selected_entry,
9042 			    view->state.ref.repo);
9043 		else
9044 			return got_error_msg(GOT_ERR_NOT_IMPL,
9045 			    "parent/child view pair not supported");
9046 		break;
9047 	case TOG_VIEW_TREE:
9048 		if (view->type == TOG_VIEW_LOG)
9049 			err = browse_commit_tree(new_view, y, x,
9050 			    view->state.log.selected_entry,
9051 			    view->state.log.in_repo_path,
9052 			    view->state.log.head_ref_name,
9053 			    view->state.log.repo);
9054 		else if (view->type == TOG_VIEW_REF)
9055 			err = browse_ref_tree(new_view, y, x,
9056 			    view->state.ref.selected_entry,
9057 			    view->state.ref.repo);
9058 		else
9059 			return got_error_msg(GOT_ERR_NOT_IMPL,
9060 			    "parent/child view pair not supported");
9061 		break;
9062 	case TOG_VIEW_REF:
9063 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9064 		if (*new_view == NULL)
9065 			return got_error_from_errno("view_open");
9066 		if (view->type == TOG_VIEW_LOG)
9067 			err = open_ref_view(*new_view, view->state.log.repo);
9068 		else if (view->type == TOG_VIEW_TREE)
9069 			err = open_ref_view(*new_view, view->state.tree.repo);
9070 		else
9071 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9072 			    "parent/child view pair not supported");
9073 		if (err)
9074 			view_close(*new_view);
9075 		break;
9076 	case TOG_VIEW_HELP:
9077 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9078 		if (*new_view == NULL)
9079 			return got_error_from_errno("view_open");
9080 		err = open_help_view(*new_view, view);
9081 		if (err)
9082 			view_close(*new_view);
9083 		break;
9084 	default:
9085 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9086 	}
9087 
9088 	return err;
9089 }
9090 
9091 /*
9092  * If view was scrolled down to move the selected line into view when opening a
9093  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9094  */
9095 static void
9096 offset_selection_up(struct tog_view *view)
9097 {
9098 	switch (view->type) {
9099 	case TOG_VIEW_BLAME: {
9100 		struct tog_blame_view_state *s = &view->state.blame;
9101 		if (s->first_displayed_line == 1) {
9102 			s->selected_line = MAX(s->selected_line - view->offset,
9103 			    1);
9104 			break;
9105 		}
9106 		if (s->first_displayed_line > view->offset)
9107 			s->first_displayed_line -= view->offset;
9108 		else
9109 			s->first_displayed_line = 1;
9110 		s->selected_line += view->offset;
9111 		break;
9112 	}
9113 	case TOG_VIEW_LOG:
9114 		log_scroll_up(&view->state.log, view->offset);
9115 		view->state.log.selected += view->offset;
9116 		break;
9117 	case TOG_VIEW_REF:
9118 		ref_scroll_up(&view->state.ref, view->offset);
9119 		view->state.ref.selected += view->offset;
9120 		break;
9121 	case TOG_VIEW_TREE:
9122 		tree_scroll_up(&view->state.tree, view->offset);
9123 		view->state.tree.selected += view->offset;
9124 		break;
9125 	default:
9126 		break;
9127 	}
9128 
9129 	view->offset = 0;
9130 }
9131 
9132 /*
9133  * If the selected line is in the section of screen covered by the bottom split,
9134  * scroll down offset lines to move it into view and index its new position.
9135  */
9136 static const struct got_error *
9137 offset_selection_down(struct tog_view *view)
9138 {
9139 	const struct got_error	*err = NULL;
9140 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9141 	int			*selected = NULL;
9142 	int			 header, offset;
9143 
9144 	switch (view->type) {
9145 	case TOG_VIEW_BLAME: {
9146 		struct tog_blame_view_state *s = &view->state.blame;
9147 		header = 3;
9148 		scrolld = NULL;
9149 		if (s->selected_line > view->nlines - header) {
9150 			offset = abs(view->nlines - s->selected_line - header);
9151 			s->first_displayed_line += offset;
9152 			s->selected_line -= offset;
9153 			view->offset = offset;
9154 		}
9155 		break;
9156 	}
9157 	case TOG_VIEW_LOG: {
9158 		struct tog_log_view_state *s = &view->state.log;
9159 		scrolld = &log_scroll_down;
9160 		header = view_is_parent_view(view) ? 3 : 2;
9161 		selected = &s->selected;
9162 		break;
9163 	}
9164 	case TOG_VIEW_REF: {
9165 		struct tog_ref_view_state *s = &view->state.ref;
9166 		scrolld = &ref_scroll_down;
9167 		header = 3;
9168 		selected = &s->selected;
9169 		break;
9170 	}
9171 	case TOG_VIEW_TREE: {
9172 		struct tog_tree_view_state *s = &view->state.tree;
9173 		scrolld = &tree_scroll_down;
9174 		header = 5;
9175 		selected = &s->selected;
9176 		break;
9177 	}
9178 	default:
9179 		selected = NULL;
9180 		scrolld = NULL;
9181 		header = 0;
9182 		break;
9183 	}
9184 
9185 	if (selected && *selected > view->nlines - header) {
9186 		offset = abs(view->nlines - *selected - header);
9187 		view->offset = offset;
9188 		if (scrolld && offset) {
9189 			err = scrolld(view, offset);
9190 			*selected -= offset;
9191 		}
9192 	}
9193 
9194 	return err;
9195 }
9196 
9197 static void
9198 list_commands(FILE *fp)
9199 {
9200 	size_t i;
9201 
9202 	fprintf(fp, "commands:");
9203 	for (i = 0; i < nitems(tog_commands); i++) {
9204 		const struct tog_cmd *cmd = &tog_commands[i];
9205 		fprintf(fp, " %s", cmd->name);
9206 	}
9207 	fputc('\n', fp);
9208 }
9209 
9210 __dead static void
9211 usage(int hflag, int status)
9212 {
9213 	FILE *fp = (status == 0) ? stdout : stderr;
9214 
9215 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9216 	    getprogname());
9217 	if (hflag) {
9218 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9219 		list_commands(fp);
9220 	}
9221 	exit(status);
9222 }
9223 
9224 static char **
9225 make_argv(int argc, ...)
9226 {
9227 	va_list ap;
9228 	char **argv;
9229 	int i;
9230 
9231 	va_start(ap, argc);
9232 
9233 	argv = calloc(argc, sizeof(char *));
9234 	if (argv == NULL)
9235 		err(1, "calloc");
9236 	for (i = 0; i < argc; i++) {
9237 		argv[i] = strdup(va_arg(ap, char *));
9238 		if (argv[i] == NULL)
9239 			err(1, "strdup");
9240 	}
9241 
9242 	va_end(ap);
9243 	return argv;
9244 }
9245 
9246 /*
9247  * Try to convert 'tog path' into a 'tog log path' command.
9248  * The user could simply have mistyped the command rather than knowingly
9249  * provided a path. So check whether argv[0] can in fact be resolved
9250  * to a path in the HEAD commit and print a special error if not.
9251  * This hack is for mpi@ <3
9252  */
9253 static const struct got_error *
9254 tog_log_with_path(int argc, char *argv[])
9255 {
9256 	const struct got_error *error = NULL, *close_err;
9257 	const struct tog_cmd *cmd = NULL;
9258 	struct got_repository *repo = NULL;
9259 	struct got_worktree *worktree = NULL;
9260 	struct got_object_id *commit_id = NULL, *id = NULL;
9261 	struct got_commit_object *commit = NULL;
9262 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9263 	char *commit_id_str = NULL, **cmd_argv = NULL;
9264 	int *pack_fds = NULL;
9265 
9266 	cwd = getcwd(NULL, 0);
9267 	if (cwd == NULL)
9268 		return got_error_from_errno("getcwd");
9269 
9270 	error = got_repo_pack_fds_open(&pack_fds);
9271 	if (error != NULL)
9272 		goto done;
9273 
9274 	error = got_worktree_open(&worktree, cwd);
9275 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9276 		goto done;
9277 
9278 	if (worktree)
9279 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9280 	else
9281 		repo_path = strdup(cwd);
9282 	if (repo_path == NULL) {
9283 		error = got_error_from_errno("strdup");
9284 		goto done;
9285 	}
9286 
9287 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9288 	if (error != NULL)
9289 		goto done;
9290 
9291 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9292 	    repo, worktree);
9293 	if (error)
9294 		goto done;
9295 
9296 	error = tog_load_refs(repo, 0);
9297 	if (error)
9298 		goto done;
9299 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9300 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9301 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9302 	if (error)
9303 		goto done;
9304 
9305 	if (worktree) {
9306 		got_worktree_close(worktree);
9307 		worktree = NULL;
9308 	}
9309 
9310 	error = got_object_open_as_commit(&commit, repo, commit_id);
9311 	if (error)
9312 		goto done;
9313 
9314 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9315 	if (error) {
9316 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9317 			goto done;
9318 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9319 		    getprogname(), argv[0]);
9320 		usage(1, 1);
9321 		/* not reached */
9322 	}
9323 
9324 	error = got_object_id_str(&commit_id_str, commit_id);
9325 	if (error)
9326 		goto done;
9327 
9328 	cmd = &tog_commands[0]; /* log */
9329 	argc = 4;
9330 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9331 	error = cmd->cmd_main(argc, cmd_argv);
9332 done:
9333 	if (repo) {
9334 		close_err = got_repo_close(repo);
9335 		if (error == NULL)
9336 			error = close_err;
9337 	}
9338 	if (commit)
9339 		got_object_commit_close(commit);
9340 	if (worktree)
9341 		got_worktree_close(worktree);
9342 	if (pack_fds) {
9343 		const struct got_error *pack_err =
9344 		    got_repo_pack_fds_close(pack_fds);
9345 		if (error == NULL)
9346 			error = pack_err;
9347 	}
9348 	free(id);
9349 	free(commit_id_str);
9350 	free(commit_id);
9351 	free(cwd);
9352 	free(repo_path);
9353 	free(in_repo_path);
9354 	if (cmd_argv) {
9355 		int i;
9356 		for (i = 0; i < argc; i++)
9357 			free(cmd_argv[i]);
9358 		free(cmd_argv);
9359 	}
9360 	tog_free_refs();
9361 	return error;
9362 }
9363 
9364 int
9365 main(int argc, char *argv[])
9366 {
9367 	const struct got_error *error = NULL;
9368 	const struct tog_cmd *cmd = NULL;
9369 	int ch, hflag = 0, Vflag = 0;
9370 	char **cmd_argv = NULL;
9371 	static const struct option longopts[] = {
9372 	    { "version", no_argument, NULL, 'V' },
9373 	    { NULL, 0, NULL, 0}
9374 	};
9375 	char *diff_algo_str = NULL;
9376 
9377 	if (!isatty(STDIN_FILENO))
9378 		errx(1, "standard input is not a tty");
9379 
9380 	setlocale(LC_CTYPE, "");
9381 
9382 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9383 		switch (ch) {
9384 		case 'h':
9385 			hflag = 1;
9386 			break;
9387 		case 'V':
9388 			Vflag = 1;
9389 			break;
9390 		default:
9391 			usage(hflag, 1);
9392 			/* NOTREACHED */
9393 		}
9394 	}
9395 
9396 	argc -= optind;
9397 	argv += optind;
9398 	optind = 1;
9399 	optreset = 1;
9400 
9401 	if (Vflag) {
9402 		got_version_print_str();
9403 		return 0;
9404 	}
9405 
9406 #ifndef PROFILE
9407 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9408 	    NULL) == -1)
9409 		err(1, "pledge");
9410 #endif
9411 
9412 	if (argc == 0) {
9413 		if (hflag)
9414 			usage(hflag, 0);
9415 		/* Build an argument vector which runs a default command. */
9416 		cmd = &tog_commands[0];
9417 		argc = 1;
9418 		cmd_argv = make_argv(argc, cmd->name);
9419 	} else {
9420 		size_t i;
9421 
9422 		/* Did the user specify a command? */
9423 		for (i = 0; i < nitems(tog_commands); i++) {
9424 			if (strncmp(tog_commands[i].name, argv[0],
9425 			    strlen(argv[0])) == 0) {
9426 				cmd = &tog_commands[i];
9427 				break;
9428 			}
9429 		}
9430 	}
9431 
9432 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9433 	if (diff_algo_str) {
9434 		if (strcasecmp(diff_algo_str, "patience") == 0)
9435 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9436 		if (strcasecmp(diff_algo_str, "myers") == 0)
9437 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9438 	}
9439 
9440 	if (cmd == NULL) {
9441 		if (argc != 1)
9442 			usage(0, 1);
9443 		/* No command specified; try log with a path */
9444 		error = tog_log_with_path(argc, argv);
9445 	} else {
9446 		if (hflag)
9447 			cmd->cmd_usage();
9448 		else
9449 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9450 	}
9451 
9452 	endwin();
9453 	putchar('\n');
9454 	if (cmd_argv) {
9455 		int i;
9456 		for (i = 0; i < argc; i++)
9457 			free(cmd_argv[i]);
9458 		free(cmd_argv);
9459 	}
9460 
9461 	if (error && error->code != GOT_ERR_CANCELLED &&
9462 	    error->code != GOT_ERR_EOF &&
9463 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9464 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9465 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9466 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9467 	return 0;
9468 }