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->first_displayed_line = 1;
5064 	s->last_displayed_line = view->nlines;
5065 	s->diff_context = diff_context;
5066 	s->ignore_whitespace = ignore_whitespace;
5067 	s->force_text_diff = force_text_diff;
5068 	s->parent_view = parent_view;
5069 	s->repo = repo;
5070 
5071 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5072 		int rc;
5073 
5074 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5075 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5076 		if (rc != ERR)
5077 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5078 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5079 		if (rc != ERR)
5080 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5081 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5082 		if (rc != ERR)
5083 			rc = init_pair(GOT_DIFF_LINE_META,
5084 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5085 		if (rc != ERR)
5086 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5087 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5088 		if (rc != ERR)
5089 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5090 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5091 		if (rc != ERR)
5092 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5093 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5094 		if (rc != ERR)
5095 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5096 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5097 		if (rc != ERR)
5098 			rc = init_pair(GOT_DIFF_LINE_DATE,
5099 			    get_color_value("TOG_COLOR_DATE"), -1);
5100 		if (rc == ERR) {
5101 			err = got_error(GOT_ERR_RANGE);
5102 			goto done;
5103 		}
5104 	}
5105 
5106 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5107 	    view_is_splitscreen(view))
5108 		show_log_view(parent_view); /* draw border */
5109 	diff_view_indicate_progress(view);
5110 
5111 	err = create_diff(s);
5112 
5113 	view->show = show_diff_view;
5114 	view->input = input_diff_view;
5115 	view->reset = reset_diff_view;
5116 	view->close = close_diff_view;
5117 	view->search_start = search_start_diff_view;
5118 	view->search_setup = search_setup_diff_view;
5119 	view->search_next = search_next_view_match;
5120 done:
5121 	if (err)
5122 		close_diff_view(view);
5123 	return err;
5124 }
5125 
5126 static const struct got_error *
5127 show_diff_view(struct tog_view *view)
5128 {
5129 	const struct got_error *err;
5130 	struct tog_diff_view_state *s = &view->state.diff;
5131 	char *id_str1 = NULL, *id_str2, *header;
5132 	const char *label1, *label2;
5133 
5134 	if (s->id1) {
5135 		err = got_object_id_str(&id_str1, s->id1);
5136 		if (err)
5137 			return err;
5138 		label1 = s->label1 ? s->label1 : id_str1;
5139 	} else
5140 		label1 = "/dev/null";
5141 
5142 	err = got_object_id_str(&id_str2, s->id2);
5143 	if (err)
5144 		return err;
5145 	label2 = s->label2 ? s->label2 : id_str2;
5146 
5147 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5148 		err = got_error_from_errno("asprintf");
5149 		free(id_str1);
5150 		free(id_str2);
5151 		return err;
5152 	}
5153 	free(id_str1);
5154 	free(id_str2);
5155 
5156 	err = draw_file(view, header);
5157 	free(header);
5158 	return err;
5159 }
5160 
5161 static const struct got_error *
5162 set_selected_commit(struct tog_diff_view_state *s,
5163     struct commit_queue_entry *entry)
5164 {
5165 	const struct got_error *err;
5166 	const struct got_object_id_queue *parent_ids;
5167 	struct got_commit_object *selected_commit;
5168 	struct got_object_qid *pid;
5169 
5170 	free(s->id2);
5171 	s->id2 = got_object_id_dup(entry->id);
5172 	if (s->id2 == NULL)
5173 		return got_error_from_errno("got_object_id_dup");
5174 
5175 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5176 	if (err)
5177 		return err;
5178 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5179 	free(s->id1);
5180 	pid = STAILQ_FIRST(parent_ids);
5181 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5182 	got_object_commit_close(selected_commit);
5183 	return NULL;
5184 }
5185 
5186 static const struct got_error *
5187 reset_diff_view(struct tog_view *view)
5188 {
5189 	struct tog_diff_view_state *s = &view->state.diff;
5190 
5191 	view->count = 0;
5192 	wclear(view->window);
5193 	s->first_displayed_line = 1;
5194 	s->last_displayed_line = view->nlines;
5195 	s->matched_line = 0;
5196 	diff_view_indicate_progress(view);
5197 	return create_diff(s);
5198 }
5199 
5200 static void
5201 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5202 {
5203 	int start, i;
5204 
5205 	i = start = s->first_displayed_line - 1;
5206 
5207 	while (s->lines[i].type != type) {
5208 		if (i == 0)
5209 			i = s->nlines - 1;
5210 		if (--i == start)
5211 			return; /* do nothing, requested type not in file */
5212 	}
5213 
5214 	s->selected_line = 1;
5215 	s->first_displayed_line = i;
5216 }
5217 
5218 static void
5219 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5220 {
5221 	int start, i;
5222 
5223 	i = start = s->first_displayed_line + 1;
5224 
5225 	while (s->lines[i].type != type) {
5226 		if (i == s->nlines - 1)
5227 			i = 0;
5228 		if (++i == start)
5229 			return; /* do nothing, requested type not in file */
5230 	}
5231 
5232 	s->selected_line = 1;
5233 	s->first_displayed_line = i;
5234 }
5235 
5236 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5237     int, int, int);
5238 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5239     int, int);
5240 
5241 static const struct got_error *
5242 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5243 {
5244 	const struct got_error *err = NULL;
5245 	struct tog_diff_view_state *s = &view->state.diff;
5246 	struct tog_log_view_state *ls;
5247 	struct commit_queue_entry *old_selected_entry;
5248 	char *line = NULL;
5249 	size_t linesize = 0;
5250 	ssize_t linelen;
5251 	int i, nscroll = view->nlines - 1, up = 0;
5252 
5253 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5254 
5255 	switch (ch) {
5256 	case '0':
5257 		view->x = 0;
5258 		break;
5259 	case '$':
5260 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5261 		view->count = 0;
5262 		break;
5263 	case KEY_RIGHT:
5264 	case 'l':
5265 		if (view->x + view->ncols / 3 < view->maxx)
5266 			view->x += 2;  /* move two columns right */
5267 		else
5268 			view->count = 0;
5269 		break;
5270 	case KEY_LEFT:
5271 	case 'h':
5272 		view->x -= MIN(view->x, 2);  /* move two columns back */
5273 		if (view->x <= 0)
5274 			view->count = 0;
5275 		break;
5276 	case 'a':
5277 	case 'w':
5278 		if (ch == 'a')
5279 			s->force_text_diff = !s->force_text_diff;
5280 		else if (ch == 'w')
5281 			s->ignore_whitespace = !s->ignore_whitespace;
5282 		err = reset_diff_view(view);
5283 		break;
5284 	case 'g':
5285 	case KEY_HOME:
5286 		s->first_displayed_line = 1;
5287 		view->count = 0;
5288 		break;
5289 	case 'G':
5290 	case KEY_END:
5291 		view->count = 0;
5292 		if (s->eof)
5293 			break;
5294 
5295 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5296 		s->eof = 1;
5297 		break;
5298 	case 'k':
5299 	case KEY_UP:
5300 	case CTRL('p'):
5301 		if (s->first_displayed_line > 1)
5302 			s->first_displayed_line--;
5303 		else
5304 			view->count = 0;
5305 		break;
5306 	case CTRL('u'):
5307 	case 'u':
5308 		nscroll /= 2;
5309 		/* FALL THROUGH */
5310 	case KEY_PPAGE:
5311 	case CTRL('b'):
5312 	case 'b':
5313 		if (s->first_displayed_line == 1) {
5314 			view->count = 0;
5315 			break;
5316 		}
5317 		i = 0;
5318 		while (i++ < nscroll && s->first_displayed_line > 1)
5319 			s->first_displayed_line--;
5320 		break;
5321 	case 'j':
5322 	case KEY_DOWN:
5323 	case CTRL('n'):
5324 		if (!s->eof)
5325 			s->first_displayed_line++;
5326 		else
5327 			view->count = 0;
5328 		break;
5329 	case CTRL('d'):
5330 	case 'd':
5331 		nscroll /= 2;
5332 		/* FALL THROUGH */
5333 	case KEY_NPAGE:
5334 	case CTRL('f'):
5335 	case 'f':
5336 	case ' ':
5337 		if (s->eof) {
5338 			view->count = 0;
5339 			break;
5340 		}
5341 		i = 0;
5342 		while (!s->eof && i++ < nscroll) {
5343 			linelen = getline(&line, &linesize, s->f);
5344 			s->first_displayed_line++;
5345 			if (linelen == -1) {
5346 				if (feof(s->f)) {
5347 					s->eof = 1;
5348 				} else
5349 					err = got_ferror(s->f, GOT_ERR_IO);
5350 				break;
5351 			}
5352 		}
5353 		free(line);
5354 		break;
5355 	case '(':
5356 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5357 		break;
5358 	case ')':
5359 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5360 		break;
5361 	case '{':
5362 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5363 		break;
5364 	case '}':
5365 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5366 		break;
5367 	case '[':
5368 		if (s->diff_context > 0) {
5369 			s->diff_context--;
5370 			s->matched_line = 0;
5371 			diff_view_indicate_progress(view);
5372 			err = create_diff(s);
5373 			if (s->first_displayed_line + view->nlines - 1 >
5374 			    s->nlines) {
5375 				s->first_displayed_line = 1;
5376 				s->last_displayed_line = view->nlines;
5377 			}
5378 		} else
5379 			view->count = 0;
5380 		break;
5381 	case ']':
5382 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5383 			s->diff_context++;
5384 			s->matched_line = 0;
5385 			diff_view_indicate_progress(view);
5386 			err = create_diff(s);
5387 		} else
5388 			view->count = 0;
5389 		break;
5390 	case '<':
5391 	case ',':
5392 	case 'K':
5393 		up = 1;
5394 		/* FALL THROUGH */
5395 	case '>':
5396 	case '.':
5397 	case 'J':
5398 		if (s->parent_view == NULL) {
5399 			view->count = 0;
5400 			break;
5401 		}
5402 		s->parent_view->count = view->count;
5403 
5404 		if (s->parent_view->type == TOG_VIEW_LOG) {
5405 			ls = &s->parent_view->state.log;
5406 			old_selected_entry = ls->selected_entry;
5407 
5408 			err = input_log_view(NULL, s->parent_view,
5409 			    up ? KEY_UP : KEY_DOWN);
5410 			if (err)
5411 				break;
5412 			view->count = s->parent_view->count;
5413 
5414 			if (old_selected_entry == ls->selected_entry)
5415 				break;
5416 
5417 			err = set_selected_commit(s, ls->selected_entry);
5418 			if (err)
5419 				break;
5420 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5421 			struct tog_blame_view_state *bs;
5422 			struct got_object_id *id, *prev_id;
5423 
5424 			bs = &s->parent_view->state.blame;
5425 			prev_id = get_annotation_for_line(bs->blame.lines,
5426 			    bs->blame.nlines, bs->last_diffed_line);
5427 
5428 			err = input_blame_view(&view, s->parent_view,
5429 			    up ? KEY_UP : KEY_DOWN);
5430 			if (err)
5431 				break;
5432 			view->count = s->parent_view->count;
5433 
5434 			if (prev_id == NULL)
5435 				break;
5436 			id = get_selected_commit_id(bs->blame.lines,
5437 			    bs->blame.nlines, bs->first_displayed_line,
5438 			    bs->selected_line);
5439 			if (id == NULL)
5440 				break;
5441 
5442 			if (!got_object_id_cmp(prev_id, id))
5443 				break;
5444 
5445 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5446 			if (err)
5447 				break;
5448 		}
5449 		s->first_displayed_line = 1;
5450 		s->last_displayed_line = view->nlines;
5451 		s->matched_line = 0;
5452 		view->x = 0;
5453 
5454 		diff_view_indicate_progress(view);
5455 		err = create_diff(s);
5456 		break;
5457 	default:
5458 		view->count = 0;
5459 		break;
5460 	}
5461 
5462 	return err;
5463 }
5464 
5465 static const struct got_error *
5466 cmd_diff(int argc, char *argv[])
5467 {
5468 	const struct got_error *error = NULL;
5469 	struct got_repository *repo = NULL;
5470 	struct got_worktree *worktree = NULL;
5471 	struct got_object_id *id1 = NULL, *id2 = NULL;
5472 	char *repo_path = NULL, *cwd = NULL;
5473 	char *id_str1 = NULL, *id_str2 = NULL;
5474 	char *label1 = NULL, *label2 = NULL;
5475 	int diff_context = 3, ignore_whitespace = 0;
5476 	int ch, force_text_diff = 0;
5477 	const char *errstr;
5478 	struct tog_view *view;
5479 	int *pack_fds = NULL;
5480 
5481 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5482 		switch (ch) {
5483 		case 'a':
5484 			force_text_diff = 1;
5485 			break;
5486 		case 'C':
5487 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5488 			    &errstr);
5489 			if (errstr != NULL)
5490 				errx(1, "number of context lines is %s: %s",
5491 				    errstr, errstr);
5492 			break;
5493 		case 'r':
5494 			repo_path = realpath(optarg, NULL);
5495 			if (repo_path == NULL)
5496 				return got_error_from_errno2("realpath",
5497 				    optarg);
5498 			got_path_strip_trailing_slashes(repo_path);
5499 			break;
5500 		case 'w':
5501 			ignore_whitespace = 1;
5502 			break;
5503 		default:
5504 			usage_diff();
5505 			/* NOTREACHED */
5506 		}
5507 	}
5508 
5509 	argc -= optind;
5510 	argv += optind;
5511 
5512 	if (argc == 0) {
5513 		usage_diff(); /* TODO show local worktree changes */
5514 	} else if (argc == 2) {
5515 		id_str1 = argv[0];
5516 		id_str2 = argv[1];
5517 	} else
5518 		usage_diff();
5519 
5520 	error = got_repo_pack_fds_open(&pack_fds);
5521 	if (error)
5522 		goto done;
5523 
5524 	if (repo_path == NULL) {
5525 		cwd = getcwd(NULL, 0);
5526 		if (cwd == NULL)
5527 			return got_error_from_errno("getcwd");
5528 		error = got_worktree_open(&worktree, cwd);
5529 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5530 			goto done;
5531 		if (worktree)
5532 			repo_path =
5533 			    strdup(got_worktree_get_repo_path(worktree));
5534 		else
5535 			repo_path = strdup(cwd);
5536 		if (repo_path == NULL) {
5537 			error = got_error_from_errno("strdup");
5538 			goto done;
5539 		}
5540 	}
5541 
5542 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5543 	if (error)
5544 		goto done;
5545 
5546 	init_curses();
5547 
5548 	error = apply_unveil(got_repo_get_path(repo), NULL);
5549 	if (error)
5550 		goto done;
5551 
5552 	error = tog_load_refs(repo, 0);
5553 	if (error)
5554 		goto done;
5555 
5556 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5557 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5558 	if (error)
5559 		goto done;
5560 
5561 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5562 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5563 	if (error)
5564 		goto done;
5565 
5566 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5567 	if (view == NULL) {
5568 		error = got_error_from_errno("view_open");
5569 		goto done;
5570 	}
5571 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5572 	    ignore_whitespace, force_text_diff, NULL,  repo);
5573 	if (error)
5574 		goto done;
5575 	error = view_loop(view);
5576 done:
5577 	free(label1);
5578 	free(label2);
5579 	free(repo_path);
5580 	free(cwd);
5581 	if (repo) {
5582 		const struct got_error *close_err = got_repo_close(repo);
5583 		if (error == NULL)
5584 			error = close_err;
5585 	}
5586 	if (worktree)
5587 		got_worktree_close(worktree);
5588 	if (pack_fds) {
5589 		const struct got_error *pack_err =
5590 		    got_repo_pack_fds_close(pack_fds);
5591 		if (error == NULL)
5592 			error = pack_err;
5593 	}
5594 	tog_free_refs();
5595 	return error;
5596 }
5597 
5598 __dead static void
5599 usage_blame(void)
5600 {
5601 	endwin();
5602 	fprintf(stderr,
5603 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5604 	    getprogname());
5605 	exit(1);
5606 }
5607 
5608 struct tog_blame_line {
5609 	int annotated;
5610 	struct got_object_id *id;
5611 };
5612 
5613 static const struct got_error *
5614 draw_blame(struct tog_view *view)
5615 {
5616 	struct tog_blame_view_state *s = &view->state.blame;
5617 	struct tog_blame *blame = &s->blame;
5618 	regmatch_t *regmatch = &view->regmatch;
5619 	const struct got_error *err;
5620 	int lineno = 0, nprinted = 0;
5621 	char *line = NULL;
5622 	size_t linesize = 0;
5623 	ssize_t linelen;
5624 	wchar_t *wline;
5625 	int width;
5626 	struct tog_blame_line *blame_line;
5627 	struct got_object_id *prev_id = NULL;
5628 	char *id_str;
5629 	struct tog_color *tc;
5630 
5631 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5632 	if (err)
5633 		return err;
5634 
5635 	rewind(blame->f);
5636 	werase(view->window);
5637 
5638 	if (asprintf(&line, "commit %s", id_str) == -1) {
5639 		err = got_error_from_errno("asprintf");
5640 		free(id_str);
5641 		return err;
5642 	}
5643 
5644 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5645 	free(line);
5646 	line = NULL;
5647 	if (err)
5648 		return err;
5649 	if (view_needs_focus_indication(view))
5650 		wstandout(view->window);
5651 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5652 	if (tc)
5653 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5654 	waddwstr(view->window, wline);
5655 	while (width++ < view->ncols)
5656 		waddch(view->window, ' ');
5657 	if (tc)
5658 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5659 	if (view_needs_focus_indication(view))
5660 		wstandend(view->window);
5661 	free(wline);
5662 	wline = NULL;
5663 
5664 	if (view->gline > blame->nlines)
5665 		view->gline = blame->nlines;
5666 
5667 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5668 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5669 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5670 		free(id_str);
5671 		return got_error_from_errno("asprintf");
5672 	}
5673 	free(id_str);
5674 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5675 	free(line);
5676 	line = NULL;
5677 	if (err)
5678 		return err;
5679 	waddwstr(view->window, wline);
5680 	free(wline);
5681 	wline = NULL;
5682 	if (width < view->ncols - 1)
5683 		waddch(view->window, '\n');
5684 
5685 	s->eof = 0;
5686 	view->maxx = 0;
5687 	while (nprinted < view->nlines - 2) {
5688 		linelen = getline(&line, &linesize, blame->f);
5689 		if (linelen == -1) {
5690 			if (feof(blame->f)) {
5691 				s->eof = 1;
5692 				break;
5693 			}
5694 			free(line);
5695 			return got_ferror(blame->f, GOT_ERR_IO);
5696 		}
5697 		if (++lineno < s->first_displayed_line)
5698 			continue;
5699 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5700 			continue;
5701 
5702 		/* Set view->maxx based on full line length. */
5703 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5704 		if (err) {
5705 			free(line);
5706 			return err;
5707 		}
5708 		free(wline);
5709 		wline = NULL;
5710 		view->maxx = MAX(view->maxx, width);
5711 
5712 		if (nprinted == s->selected_line - 1)
5713 			wstandout(view->window);
5714 
5715 		if (blame->nlines > 0) {
5716 			blame_line = &blame->lines[lineno - 1];
5717 			if (blame_line->annotated && prev_id &&
5718 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5719 			    !(nprinted == s->selected_line - 1)) {
5720 				waddstr(view->window, "        ");
5721 			} else if (blame_line->annotated) {
5722 				char *id_str;
5723 				err = got_object_id_str(&id_str,
5724 				    blame_line->id);
5725 				if (err) {
5726 					free(line);
5727 					return err;
5728 				}
5729 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5730 				if (tc)
5731 					wattr_on(view->window,
5732 					    COLOR_PAIR(tc->colorpair), NULL);
5733 				wprintw(view->window, "%.8s", id_str);
5734 				if (tc)
5735 					wattr_off(view->window,
5736 					    COLOR_PAIR(tc->colorpair), NULL);
5737 				free(id_str);
5738 				prev_id = blame_line->id;
5739 			} else {
5740 				waddstr(view->window, "........");
5741 				prev_id = NULL;
5742 			}
5743 		} else {
5744 			waddstr(view->window, "........");
5745 			prev_id = NULL;
5746 		}
5747 
5748 		if (nprinted == s->selected_line - 1)
5749 			wstandend(view->window);
5750 		waddstr(view->window, " ");
5751 
5752 		if (view->ncols <= 9) {
5753 			width = 9;
5754 		} else if (s->first_displayed_line + nprinted ==
5755 		    s->matched_line &&
5756 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5757 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5758 			    view->window, view->x, regmatch);
5759 			if (err) {
5760 				free(line);
5761 				return err;
5762 			}
5763 			width += 9;
5764 		} else {
5765 			int skip;
5766 			err = format_line(&wline, &width, &skip, line,
5767 			    view->x, view->ncols - 9, 9, 1);
5768 			if (err) {
5769 				free(line);
5770 				return err;
5771 			}
5772 			waddwstr(view->window, &wline[skip]);
5773 			width += 9;
5774 			free(wline);
5775 			wline = NULL;
5776 		}
5777 
5778 		if (width <= view->ncols - 1)
5779 			waddch(view->window, '\n');
5780 		if (++nprinted == 1)
5781 			s->first_displayed_line = lineno;
5782 	}
5783 	free(line);
5784 	s->last_displayed_line = lineno;
5785 
5786 	view_border(view);
5787 
5788 	return NULL;
5789 }
5790 
5791 static const struct got_error *
5792 blame_cb(void *arg, int nlines, int lineno,
5793     struct got_commit_object *commit, struct got_object_id *id)
5794 {
5795 	const struct got_error *err = NULL;
5796 	struct tog_blame_cb_args *a = arg;
5797 	struct tog_blame_line *line;
5798 	int errcode;
5799 
5800 	if (nlines != a->nlines ||
5801 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5802 		return got_error(GOT_ERR_RANGE);
5803 
5804 	errcode = pthread_mutex_lock(&tog_mutex);
5805 	if (errcode)
5806 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5807 
5808 	if (*a->quit) {	/* user has quit the blame view */
5809 		err = got_error(GOT_ERR_ITER_COMPLETED);
5810 		goto done;
5811 	}
5812 
5813 	if (lineno == -1)
5814 		goto done; /* no change in this commit */
5815 
5816 	line = &a->lines[lineno - 1];
5817 	if (line->annotated)
5818 		goto done;
5819 
5820 	line->id = got_object_id_dup(id);
5821 	if (line->id == NULL) {
5822 		err = got_error_from_errno("got_object_id_dup");
5823 		goto done;
5824 	}
5825 	line->annotated = 1;
5826 done:
5827 	errcode = pthread_mutex_unlock(&tog_mutex);
5828 	if (errcode)
5829 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5830 	return err;
5831 }
5832 
5833 static void *
5834 blame_thread(void *arg)
5835 {
5836 	const struct got_error *err, *close_err;
5837 	struct tog_blame_thread_args *ta = arg;
5838 	struct tog_blame_cb_args *a = ta->cb_args;
5839 	int errcode, fd1 = -1, fd2 = -1;
5840 	FILE *f1 = NULL, *f2 = NULL;
5841 
5842 	fd1 = got_opentempfd();
5843 	if (fd1 == -1)
5844 		return (void *)got_error_from_errno("got_opentempfd");
5845 
5846 	fd2 = got_opentempfd();
5847 	if (fd2 == -1) {
5848 		err = got_error_from_errno("got_opentempfd");
5849 		goto done;
5850 	}
5851 
5852 	f1 = got_opentemp();
5853 	if (f1 == NULL) {
5854 		err = (void *)got_error_from_errno("got_opentemp");
5855 		goto done;
5856 	}
5857 	f2 = got_opentemp();
5858 	if (f2 == NULL) {
5859 		err = (void *)got_error_from_errno("got_opentemp");
5860 		goto done;
5861 	}
5862 
5863 	err = block_signals_used_by_main_thread();
5864 	if (err)
5865 		goto done;
5866 
5867 	err = got_blame(ta->path, a->commit_id, ta->repo,
5868 	    tog_diff_algo, blame_cb, ta->cb_args,
5869 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5870 	if (err && err->code == GOT_ERR_CANCELLED)
5871 		err = NULL;
5872 
5873 	errcode = pthread_mutex_lock(&tog_mutex);
5874 	if (errcode) {
5875 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5876 		goto done;
5877 	}
5878 
5879 	close_err = got_repo_close(ta->repo);
5880 	if (err == NULL)
5881 		err = close_err;
5882 	ta->repo = NULL;
5883 	*ta->complete = 1;
5884 
5885 	errcode = pthread_mutex_unlock(&tog_mutex);
5886 	if (errcode && err == NULL)
5887 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5888 
5889 done:
5890 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5891 		err = got_error_from_errno("close");
5892 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5893 		err = got_error_from_errno("close");
5894 	if (f1 && fclose(f1) == EOF && err == NULL)
5895 		err = got_error_from_errno("fclose");
5896 	if (f2 && fclose(f2) == EOF && err == NULL)
5897 		err = got_error_from_errno("fclose");
5898 
5899 	return (void *)err;
5900 }
5901 
5902 static struct got_object_id *
5903 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5904     int first_displayed_line, int selected_line)
5905 {
5906 	struct tog_blame_line *line;
5907 
5908 	if (nlines <= 0)
5909 		return NULL;
5910 
5911 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5912 	if (!line->annotated)
5913 		return NULL;
5914 
5915 	return line->id;
5916 }
5917 
5918 static struct got_object_id *
5919 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5920     int lineno)
5921 {
5922 	struct tog_blame_line *line;
5923 
5924 	if (nlines <= 0 || lineno >= nlines)
5925 		return NULL;
5926 
5927 	line = &lines[lineno - 1];
5928 	if (!line->annotated)
5929 		return NULL;
5930 
5931 	return line->id;
5932 }
5933 
5934 static const struct got_error *
5935 stop_blame(struct tog_blame *blame)
5936 {
5937 	const struct got_error *err = NULL;
5938 	int i;
5939 
5940 	if (blame->thread) {
5941 		int errcode;
5942 		errcode = pthread_mutex_unlock(&tog_mutex);
5943 		if (errcode)
5944 			return got_error_set_errno(errcode,
5945 			    "pthread_mutex_unlock");
5946 		errcode = pthread_join(blame->thread, (void **)&err);
5947 		if (errcode)
5948 			return got_error_set_errno(errcode, "pthread_join");
5949 		errcode = pthread_mutex_lock(&tog_mutex);
5950 		if (errcode)
5951 			return got_error_set_errno(errcode,
5952 			    "pthread_mutex_lock");
5953 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5954 			err = NULL;
5955 		blame->thread = NULL;
5956 	}
5957 	if (blame->thread_args.repo) {
5958 		const struct got_error *close_err;
5959 		close_err = got_repo_close(blame->thread_args.repo);
5960 		if (err == NULL)
5961 			err = close_err;
5962 		blame->thread_args.repo = NULL;
5963 	}
5964 	if (blame->f) {
5965 		if (fclose(blame->f) == EOF && err == NULL)
5966 			err = got_error_from_errno("fclose");
5967 		blame->f = NULL;
5968 	}
5969 	if (blame->lines) {
5970 		for (i = 0; i < blame->nlines; i++)
5971 			free(blame->lines[i].id);
5972 		free(blame->lines);
5973 		blame->lines = NULL;
5974 	}
5975 	free(blame->cb_args.commit_id);
5976 	blame->cb_args.commit_id = NULL;
5977 	if (blame->pack_fds) {
5978 		const struct got_error *pack_err =
5979 		    got_repo_pack_fds_close(blame->pack_fds);
5980 		if (err == NULL)
5981 			err = pack_err;
5982 		blame->pack_fds = NULL;
5983 	}
5984 	return err;
5985 }
5986 
5987 static const struct got_error *
5988 cancel_blame_view(void *arg)
5989 {
5990 	const struct got_error *err = NULL;
5991 	int *done = arg;
5992 	int errcode;
5993 
5994 	errcode = pthread_mutex_lock(&tog_mutex);
5995 	if (errcode)
5996 		return got_error_set_errno(errcode,
5997 		    "pthread_mutex_unlock");
5998 
5999 	if (*done)
6000 		err = got_error(GOT_ERR_CANCELLED);
6001 
6002 	errcode = pthread_mutex_unlock(&tog_mutex);
6003 	if (errcode)
6004 		return got_error_set_errno(errcode,
6005 		    "pthread_mutex_lock");
6006 
6007 	return err;
6008 }
6009 
6010 static const struct got_error *
6011 run_blame(struct tog_view *view)
6012 {
6013 	struct tog_blame_view_state *s = &view->state.blame;
6014 	struct tog_blame *blame = &s->blame;
6015 	const struct got_error *err = NULL;
6016 	struct got_commit_object *commit = NULL;
6017 	struct got_blob_object *blob = NULL;
6018 	struct got_repository *thread_repo = NULL;
6019 	struct got_object_id *obj_id = NULL;
6020 	int obj_type, fd = -1;
6021 	int *pack_fds = NULL;
6022 
6023 	err = got_object_open_as_commit(&commit, s->repo,
6024 	    &s->blamed_commit->id);
6025 	if (err)
6026 		return err;
6027 
6028 	fd = got_opentempfd();
6029 	if (fd == -1) {
6030 		err = got_error_from_errno("got_opentempfd");
6031 		goto done;
6032 	}
6033 
6034 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6035 	if (err)
6036 		goto done;
6037 
6038 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6039 	if (err)
6040 		goto done;
6041 
6042 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6043 		err = got_error(GOT_ERR_OBJ_TYPE);
6044 		goto done;
6045 	}
6046 
6047 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6048 	if (err)
6049 		goto done;
6050 	blame->f = got_opentemp();
6051 	if (blame->f == NULL) {
6052 		err = got_error_from_errno("got_opentemp");
6053 		goto done;
6054 	}
6055 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6056 	    &blame->line_offsets, blame->f, blob);
6057 	if (err)
6058 		goto done;
6059 	if (blame->nlines == 0) {
6060 		s->blame_complete = 1;
6061 		goto done;
6062 	}
6063 
6064 	/* Don't include \n at EOF in the blame line count. */
6065 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6066 		blame->nlines--;
6067 
6068 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6069 	if (blame->lines == NULL) {
6070 		err = got_error_from_errno("calloc");
6071 		goto done;
6072 	}
6073 
6074 	err = got_repo_pack_fds_open(&pack_fds);
6075 	if (err)
6076 		goto done;
6077 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6078 	    pack_fds);
6079 	if (err)
6080 		goto done;
6081 
6082 	blame->pack_fds = pack_fds;
6083 	blame->cb_args.view = view;
6084 	blame->cb_args.lines = blame->lines;
6085 	blame->cb_args.nlines = blame->nlines;
6086 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6087 	if (blame->cb_args.commit_id == NULL) {
6088 		err = got_error_from_errno("got_object_id_dup");
6089 		goto done;
6090 	}
6091 	blame->cb_args.quit = &s->done;
6092 
6093 	blame->thread_args.path = s->path;
6094 	blame->thread_args.repo = thread_repo;
6095 	blame->thread_args.cb_args = &blame->cb_args;
6096 	blame->thread_args.complete = &s->blame_complete;
6097 	blame->thread_args.cancel_cb = cancel_blame_view;
6098 	blame->thread_args.cancel_arg = &s->done;
6099 	s->blame_complete = 0;
6100 
6101 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6102 		s->first_displayed_line = 1;
6103 		s->last_displayed_line = view->nlines;
6104 		s->selected_line = 1;
6105 	}
6106 	s->matched_line = 0;
6107 
6108 done:
6109 	if (commit)
6110 		got_object_commit_close(commit);
6111 	if (fd != -1 && close(fd) == -1 && err == NULL)
6112 		err = got_error_from_errno("close");
6113 	if (blob)
6114 		got_object_blob_close(blob);
6115 	free(obj_id);
6116 	if (err)
6117 		stop_blame(blame);
6118 	return err;
6119 }
6120 
6121 static const struct got_error *
6122 open_blame_view(struct tog_view *view, char *path,
6123     struct got_object_id *commit_id, struct got_repository *repo)
6124 {
6125 	const struct got_error *err = NULL;
6126 	struct tog_blame_view_state *s = &view->state.blame;
6127 
6128 	STAILQ_INIT(&s->blamed_commits);
6129 
6130 	s->path = strdup(path);
6131 	if (s->path == NULL)
6132 		return got_error_from_errno("strdup");
6133 
6134 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6135 	if (err) {
6136 		free(s->path);
6137 		return err;
6138 	}
6139 
6140 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6141 	s->first_displayed_line = 1;
6142 	s->last_displayed_line = view->nlines;
6143 	s->selected_line = 1;
6144 	s->blame_complete = 0;
6145 	s->repo = repo;
6146 	s->commit_id = commit_id;
6147 	memset(&s->blame, 0, sizeof(s->blame));
6148 
6149 	STAILQ_INIT(&s->colors);
6150 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6151 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6152 		    get_color_value("TOG_COLOR_COMMIT"));
6153 		if (err)
6154 			return err;
6155 	}
6156 
6157 	view->show = show_blame_view;
6158 	view->input = input_blame_view;
6159 	view->reset = reset_blame_view;
6160 	view->close = close_blame_view;
6161 	view->search_start = search_start_blame_view;
6162 	view->search_setup = search_setup_blame_view;
6163 	view->search_next = search_next_view_match;
6164 
6165 	return run_blame(view);
6166 }
6167 
6168 static const struct got_error *
6169 close_blame_view(struct tog_view *view)
6170 {
6171 	const struct got_error *err = NULL;
6172 	struct tog_blame_view_state *s = &view->state.blame;
6173 
6174 	if (s->blame.thread)
6175 		err = stop_blame(&s->blame);
6176 
6177 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6178 		struct got_object_qid *blamed_commit;
6179 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6180 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6181 		got_object_qid_free(blamed_commit);
6182 	}
6183 
6184 	free(s->path);
6185 	free_colors(&s->colors);
6186 	return err;
6187 }
6188 
6189 static const struct got_error *
6190 search_start_blame_view(struct tog_view *view)
6191 {
6192 	struct tog_blame_view_state *s = &view->state.blame;
6193 
6194 	s->matched_line = 0;
6195 	return NULL;
6196 }
6197 
6198 static void
6199 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6200     size_t *nlines, int **first, int **last, int **match, int **selected)
6201 {
6202 	struct tog_blame_view_state *s = &view->state.blame;
6203 
6204 	*f = s->blame.f;
6205 	*nlines = s->blame.nlines;
6206 	*line_offsets = s->blame.line_offsets;
6207 	*match = &s->matched_line;
6208 	*first = &s->first_displayed_line;
6209 	*last = &s->last_displayed_line;
6210 	*selected = &s->selected_line;
6211 }
6212 
6213 static const struct got_error *
6214 show_blame_view(struct tog_view *view)
6215 {
6216 	const struct got_error *err = NULL;
6217 	struct tog_blame_view_state *s = &view->state.blame;
6218 	int errcode;
6219 
6220 	if (s->blame.thread == NULL && !s->blame_complete) {
6221 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6222 		    &s->blame.thread_args);
6223 		if (errcode)
6224 			return got_error_set_errno(errcode, "pthread_create");
6225 
6226 		halfdelay(1); /* fast refresh while annotating  */
6227 	}
6228 
6229 	if (s->blame_complete)
6230 		halfdelay(10); /* disable fast refresh */
6231 
6232 	err = draw_blame(view);
6233 
6234 	view_border(view);
6235 	return err;
6236 }
6237 
6238 static const struct got_error *
6239 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6240     struct got_repository *repo, struct got_object_id *id)
6241 {
6242 	struct tog_view		*log_view;
6243 	const struct got_error	*err = NULL;
6244 
6245 	*new_view = NULL;
6246 
6247 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6248 	if (log_view == NULL)
6249 		return got_error_from_errno("view_open");
6250 
6251 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6252 	if (err)
6253 		view_close(log_view);
6254 	else
6255 		*new_view = log_view;
6256 
6257 	return err;
6258 }
6259 
6260 static const struct got_error *
6261 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6262 {
6263 	const struct got_error *err = NULL, *thread_err = NULL;
6264 	struct tog_view *diff_view;
6265 	struct tog_blame_view_state *s = &view->state.blame;
6266 	int eos, nscroll, begin_y = 0, begin_x = 0;
6267 
6268 	eos = nscroll = view->nlines - 2;
6269 	if (view_is_hsplit_top(view))
6270 		--eos;  /* border */
6271 
6272 	switch (ch) {
6273 	case '0':
6274 		view->x = 0;
6275 		break;
6276 	case '$':
6277 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6278 		view->count = 0;
6279 		break;
6280 	case KEY_RIGHT:
6281 	case 'l':
6282 		if (view->x + view->ncols / 3 < view->maxx)
6283 			view->x += 2;  /* move two columns right */
6284 		else
6285 			view->count = 0;
6286 		break;
6287 	case KEY_LEFT:
6288 	case 'h':
6289 		view->x -= MIN(view->x, 2);  /* move two columns back */
6290 		if (view->x <= 0)
6291 			view->count = 0;
6292 		break;
6293 	case 'q':
6294 		s->done = 1;
6295 		break;
6296 	case 'g':
6297 	case KEY_HOME:
6298 		s->selected_line = 1;
6299 		s->first_displayed_line = 1;
6300 		view->count = 0;
6301 		break;
6302 	case 'G':
6303 	case KEY_END:
6304 		if (s->blame.nlines < eos) {
6305 			s->selected_line = s->blame.nlines;
6306 			s->first_displayed_line = 1;
6307 		} else {
6308 			s->selected_line = eos;
6309 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6310 		}
6311 		view->count = 0;
6312 		break;
6313 	case 'k':
6314 	case KEY_UP:
6315 	case CTRL('p'):
6316 		if (s->selected_line > 1)
6317 			s->selected_line--;
6318 		else if (s->selected_line == 1 &&
6319 		    s->first_displayed_line > 1)
6320 			s->first_displayed_line--;
6321 		else
6322 			view->count = 0;
6323 		break;
6324 	case CTRL('u'):
6325 	case 'u':
6326 		nscroll /= 2;
6327 		/* FALL THROUGH */
6328 	case KEY_PPAGE:
6329 	case CTRL('b'):
6330 	case 'b':
6331 		if (s->first_displayed_line == 1) {
6332 			if (view->count > 1)
6333 				nscroll += nscroll;
6334 			s->selected_line = MAX(1, s->selected_line - nscroll);
6335 			view->count = 0;
6336 			break;
6337 		}
6338 		if (s->first_displayed_line > nscroll)
6339 			s->first_displayed_line -= nscroll;
6340 		else
6341 			s->first_displayed_line = 1;
6342 		break;
6343 	case 'j':
6344 	case KEY_DOWN:
6345 	case CTRL('n'):
6346 		if (s->selected_line < eos && s->first_displayed_line +
6347 		    s->selected_line <= s->blame.nlines)
6348 			s->selected_line++;
6349 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6350 			s->first_displayed_line++;
6351 		else
6352 			view->count = 0;
6353 		break;
6354 	case 'c':
6355 	case 'p': {
6356 		struct got_object_id *id = NULL;
6357 
6358 		view->count = 0;
6359 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6360 		    s->first_displayed_line, s->selected_line);
6361 		if (id == NULL)
6362 			break;
6363 		if (ch == 'p') {
6364 			struct got_commit_object *commit, *pcommit;
6365 			struct got_object_qid *pid;
6366 			struct got_object_id *blob_id = NULL;
6367 			int obj_type;
6368 			err = got_object_open_as_commit(&commit,
6369 			    s->repo, id);
6370 			if (err)
6371 				break;
6372 			pid = STAILQ_FIRST(
6373 			    got_object_commit_get_parent_ids(commit));
6374 			if (pid == NULL) {
6375 				got_object_commit_close(commit);
6376 				break;
6377 			}
6378 			/* Check if path history ends here. */
6379 			err = got_object_open_as_commit(&pcommit,
6380 			    s->repo, &pid->id);
6381 			if (err)
6382 				break;
6383 			err = got_object_id_by_path(&blob_id, s->repo,
6384 			    pcommit, s->path);
6385 			got_object_commit_close(pcommit);
6386 			if (err) {
6387 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6388 					err = NULL;
6389 				got_object_commit_close(commit);
6390 				break;
6391 			}
6392 			err = got_object_get_type(&obj_type, s->repo,
6393 			    blob_id);
6394 			free(blob_id);
6395 			/* Can't blame non-blob type objects. */
6396 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6397 				got_object_commit_close(commit);
6398 				break;
6399 			}
6400 			err = got_object_qid_alloc(&s->blamed_commit,
6401 			    &pid->id);
6402 			got_object_commit_close(commit);
6403 		} else {
6404 			if (got_object_id_cmp(id,
6405 			    &s->blamed_commit->id) == 0)
6406 				break;
6407 			err = got_object_qid_alloc(&s->blamed_commit,
6408 			    id);
6409 		}
6410 		if (err)
6411 			break;
6412 		s->done = 1;
6413 		thread_err = stop_blame(&s->blame);
6414 		s->done = 0;
6415 		if (thread_err)
6416 			break;
6417 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6418 		    s->blamed_commit, entry);
6419 		err = run_blame(view);
6420 		if (err)
6421 			break;
6422 		break;
6423 	}
6424 	case 'C': {
6425 		struct got_object_qid *first;
6426 
6427 		view->count = 0;
6428 		first = STAILQ_FIRST(&s->blamed_commits);
6429 		if (!got_object_id_cmp(&first->id, s->commit_id))
6430 			break;
6431 		s->done = 1;
6432 		thread_err = stop_blame(&s->blame);
6433 		s->done = 0;
6434 		if (thread_err)
6435 			break;
6436 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6437 		got_object_qid_free(s->blamed_commit);
6438 		s->blamed_commit =
6439 		    STAILQ_FIRST(&s->blamed_commits);
6440 		err = run_blame(view);
6441 		if (err)
6442 			break;
6443 		break;
6444 	}
6445 	case 'L':
6446 		view->count = 0;
6447 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6448 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6449 		if (s->id_to_log)
6450 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6451 		break;
6452 	case KEY_ENTER:
6453 	case '\r': {
6454 		struct got_object_id *id = NULL;
6455 		struct got_object_qid *pid;
6456 		struct got_commit_object *commit = NULL;
6457 
6458 		view->count = 0;
6459 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6460 		    s->first_displayed_line, s->selected_line);
6461 		if (id == NULL)
6462 			break;
6463 		err = got_object_open_as_commit(&commit, s->repo, id);
6464 		if (err)
6465 			break;
6466 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6467 		if (*new_view) {
6468 			/* traversed from diff view, release diff resources  */
6469 			err = close_diff_view(*new_view);
6470 			if (err)
6471 				break;
6472 			diff_view = *new_view;
6473 		} else {
6474 			if (view_is_parent_view(view))
6475 				view_get_split(view, &begin_y, &begin_x);
6476 
6477 			diff_view = view_open(0, 0, begin_y, begin_x,
6478 			    TOG_VIEW_DIFF);
6479 			if (diff_view == NULL) {
6480 				got_object_commit_close(commit);
6481 				err = got_error_from_errno("view_open");
6482 				break;
6483 			}
6484 		}
6485 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6486 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6487 		got_object_commit_close(commit);
6488 		if (err) {
6489 			view_close(diff_view);
6490 			break;
6491 		}
6492 		s->last_diffed_line = s->first_displayed_line - 1 +
6493 		    s->selected_line;
6494 		if (*new_view)
6495 			break;	/* still open from active diff view */
6496 		if (view_is_parent_view(view) &&
6497 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6498 			err = view_init_hsplit(view, begin_y);
6499 			if (err)
6500 				break;
6501 		}
6502 
6503 		view->focussed = 0;
6504 		diff_view->focussed = 1;
6505 		diff_view->mode = view->mode;
6506 		diff_view->nlines = view->lines - begin_y;
6507 		if (view_is_parent_view(view)) {
6508 			view_transfer_size(diff_view, view);
6509 			err = view_close_child(view);
6510 			if (err)
6511 				break;
6512 			err = view_set_child(view, diff_view);
6513 			if (err)
6514 				break;
6515 			view->focus_child = 1;
6516 		} else
6517 			*new_view = diff_view;
6518 		if (err)
6519 			break;
6520 		break;
6521 	}
6522 	case CTRL('d'):
6523 	case 'd':
6524 		nscroll /= 2;
6525 		/* FALL THROUGH */
6526 	case KEY_NPAGE:
6527 	case CTRL('f'):
6528 	case 'f':
6529 	case ' ':
6530 		if (s->last_displayed_line >= s->blame.nlines &&
6531 		    s->selected_line >= MIN(s->blame.nlines,
6532 		    view->nlines - 2)) {
6533 			view->count = 0;
6534 			break;
6535 		}
6536 		if (s->last_displayed_line >= s->blame.nlines &&
6537 		    s->selected_line < view->nlines - 2) {
6538 			s->selected_line +=
6539 			    MIN(nscroll, s->last_displayed_line -
6540 			    s->first_displayed_line - s->selected_line + 1);
6541 		}
6542 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6543 			s->first_displayed_line += nscroll;
6544 		else
6545 			s->first_displayed_line =
6546 			    s->blame.nlines - (view->nlines - 3);
6547 		break;
6548 	case KEY_RESIZE:
6549 		if (s->selected_line > view->nlines - 2) {
6550 			s->selected_line = MIN(s->blame.nlines,
6551 			    view->nlines - 2);
6552 		}
6553 		break;
6554 	default:
6555 		view->count = 0;
6556 		break;
6557 	}
6558 	return thread_err ? thread_err : err;
6559 }
6560 
6561 static const struct got_error *
6562 reset_blame_view(struct tog_view *view)
6563 {
6564 	const struct got_error *err;
6565 	struct tog_blame_view_state *s = &view->state.blame;
6566 
6567 	view->count = 0;
6568 	s->done = 1;
6569 	err = stop_blame(&s->blame);
6570 	s->done = 0;
6571 	if (err)
6572 		return err;
6573 	return run_blame(view);
6574 }
6575 
6576 static const struct got_error *
6577 cmd_blame(int argc, char *argv[])
6578 {
6579 	const struct got_error *error;
6580 	struct got_repository *repo = NULL;
6581 	struct got_worktree *worktree = NULL;
6582 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6583 	char *link_target = NULL;
6584 	struct got_object_id *commit_id = NULL;
6585 	struct got_commit_object *commit = NULL;
6586 	char *commit_id_str = NULL;
6587 	int ch;
6588 	struct tog_view *view;
6589 	int *pack_fds = NULL;
6590 
6591 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6592 		switch (ch) {
6593 		case 'c':
6594 			commit_id_str = optarg;
6595 			break;
6596 		case 'r':
6597 			repo_path = realpath(optarg, NULL);
6598 			if (repo_path == NULL)
6599 				return got_error_from_errno2("realpath",
6600 				    optarg);
6601 			break;
6602 		default:
6603 			usage_blame();
6604 			/* NOTREACHED */
6605 		}
6606 	}
6607 
6608 	argc -= optind;
6609 	argv += optind;
6610 
6611 	if (argc != 1)
6612 		usage_blame();
6613 
6614 	error = got_repo_pack_fds_open(&pack_fds);
6615 	if (error != NULL)
6616 		goto done;
6617 
6618 	if (repo_path == NULL) {
6619 		cwd = getcwd(NULL, 0);
6620 		if (cwd == NULL)
6621 			return got_error_from_errno("getcwd");
6622 		error = got_worktree_open(&worktree, cwd);
6623 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6624 			goto done;
6625 		if (worktree)
6626 			repo_path =
6627 			    strdup(got_worktree_get_repo_path(worktree));
6628 		else
6629 			repo_path = strdup(cwd);
6630 		if (repo_path == NULL) {
6631 			error = got_error_from_errno("strdup");
6632 			goto done;
6633 		}
6634 	}
6635 
6636 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6637 	if (error != NULL)
6638 		goto done;
6639 
6640 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6641 	    worktree);
6642 	if (error)
6643 		goto done;
6644 
6645 	init_curses();
6646 
6647 	error = apply_unveil(got_repo_get_path(repo), NULL);
6648 	if (error)
6649 		goto done;
6650 
6651 	error = tog_load_refs(repo, 0);
6652 	if (error)
6653 		goto done;
6654 
6655 	if (commit_id_str == NULL) {
6656 		struct got_reference *head_ref;
6657 		error = got_ref_open(&head_ref, repo, worktree ?
6658 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6659 		if (error != NULL)
6660 			goto done;
6661 		error = got_ref_resolve(&commit_id, repo, head_ref);
6662 		got_ref_close(head_ref);
6663 	} else {
6664 		error = got_repo_match_object_id(&commit_id, NULL,
6665 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6666 	}
6667 	if (error != NULL)
6668 		goto done;
6669 
6670 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6671 	if (view == NULL) {
6672 		error = got_error_from_errno("view_open");
6673 		goto done;
6674 	}
6675 
6676 	error = got_object_open_as_commit(&commit, repo, commit_id);
6677 	if (error)
6678 		goto done;
6679 
6680 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6681 	    commit, repo);
6682 	if (error)
6683 		goto done;
6684 
6685 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6686 	    commit_id, repo);
6687 	if (error)
6688 		goto done;
6689 	if (worktree) {
6690 		/* Release work tree lock. */
6691 		got_worktree_close(worktree);
6692 		worktree = NULL;
6693 	}
6694 	error = view_loop(view);
6695 done:
6696 	free(repo_path);
6697 	free(in_repo_path);
6698 	free(link_target);
6699 	free(cwd);
6700 	free(commit_id);
6701 	if (commit)
6702 		got_object_commit_close(commit);
6703 	if (worktree)
6704 		got_worktree_close(worktree);
6705 	if (repo) {
6706 		const struct got_error *close_err = got_repo_close(repo);
6707 		if (error == NULL)
6708 			error = close_err;
6709 	}
6710 	if (pack_fds) {
6711 		const struct got_error *pack_err =
6712 		    got_repo_pack_fds_close(pack_fds);
6713 		if (error == NULL)
6714 			error = pack_err;
6715 	}
6716 	tog_free_refs();
6717 	return error;
6718 }
6719 
6720 static const struct got_error *
6721 draw_tree_entries(struct tog_view *view, const char *parent_path)
6722 {
6723 	struct tog_tree_view_state *s = &view->state.tree;
6724 	const struct got_error *err = NULL;
6725 	struct got_tree_entry *te;
6726 	wchar_t *wline;
6727 	char *index = NULL;
6728 	struct tog_color *tc;
6729 	int width, n, nentries, i = 1;
6730 	int limit = view->nlines;
6731 
6732 	s->ndisplayed = 0;
6733 	if (view_is_hsplit_top(view))
6734 		--limit;  /* border */
6735 
6736 	werase(view->window);
6737 
6738 	if (limit == 0)
6739 		return NULL;
6740 
6741 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6742 	    0, 0);
6743 	if (err)
6744 		return err;
6745 	if (view_needs_focus_indication(view))
6746 		wstandout(view->window);
6747 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6748 	if (tc)
6749 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6750 	waddwstr(view->window, wline);
6751 	free(wline);
6752 	wline = NULL;
6753 	while (width++ < view->ncols)
6754 		waddch(view->window, ' ');
6755 	if (tc)
6756 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6757 	if (view_needs_focus_indication(view))
6758 		wstandend(view->window);
6759 	if (--limit <= 0)
6760 		return NULL;
6761 
6762 	i += s->selected;
6763 	if (s->first_displayed_entry) {
6764 		i += got_tree_entry_get_index(s->first_displayed_entry);
6765 		if (s->tree != s->root)
6766 			++i;  /* account for ".." entry */
6767 	}
6768 	nentries = got_object_tree_get_nentries(s->tree);
6769 	if (asprintf(&index, "[%d/%d] %s",
6770 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6771 		return got_error_from_errno("asprintf");
6772 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6773 	free(index);
6774 	if (err)
6775 		return err;
6776 	waddwstr(view->window, wline);
6777 	free(wline);
6778 	wline = NULL;
6779 	if (width < view->ncols - 1)
6780 		waddch(view->window, '\n');
6781 	if (--limit <= 0)
6782 		return NULL;
6783 	waddch(view->window, '\n');
6784 	if (--limit <= 0)
6785 		return NULL;
6786 
6787 	if (s->first_displayed_entry == NULL) {
6788 		te = got_object_tree_get_first_entry(s->tree);
6789 		if (s->selected == 0) {
6790 			if (view->focussed)
6791 				wstandout(view->window);
6792 			s->selected_entry = NULL;
6793 		}
6794 		waddstr(view->window, "  ..\n");	/* parent directory */
6795 		if (s->selected == 0 && view->focussed)
6796 			wstandend(view->window);
6797 		s->ndisplayed++;
6798 		if (--limit <= 0)
6799 			return NULL;
6800 		n = 1;
6801 	} else {
6802 		n = 0;
6803 		te = s->first_displayed_entry;
6804 	}
6805 
6806 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6807 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6808 		const char *modestr = "";
6809 		mode_t mode;
6810 
6811 		te = got_object_tree_get_entry(s->tree, i);
6812 		mode = got_tree_entry_get_mode(te);
6813 
6814 		if (s->show_ids) {
6815 			err = got_object_id_str(&id_str,
6816 			    got_tree_entry_get_id(te));
6817 			if (err)
6818 				return got_error_from_errno(
6819 				    "got_object_id_str");
6820 		}
6821 		if (got_object_tree_entry_is_submodule(te))
6822 			modestr = "$";
6823 		else if (S_ISLNK(mode)) {
6824 			int i;
6825 
6826 			err = got_tree_entry_get_symlink_target(&link_target,
6827 			    te, s->repo);
6828 			if (err) {
6829 				free(id_str);
6830 				return err;
6831 			}
6832 			for (i = 0; i < strlen(link_target); i++) {
6833 				if (!isprint((unsigned char)link_target[i]))
6834 					link_target[i] = '?';
6835 			}
6836 			modestr = "@";
6837 		}
6838 		else if (S_ISDIR(mode))
6839 			modestr = "/";
6840 		else if (mode & S_IXUSR)
6841 			modestr = "*";
6842 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6843 		    got_tree_entry_get_name(te), modestr,
6844 		    link_target ? " -> ": "",
6845 		    link_target ? link_target : "") == -1) {
6846 			free(id_str);
6847 			free(link_target);
6848 			return got_error_from_errno("asprintf");
6849 		}
6850 		free(id_str);
6851 		free(link_target);
6852 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6853 		    0, 0);
6854 		if (err) {
6855 			free(line);
6856 			break;
6857 		}
6858 		if (n == s->selected) {
6859 			if (view->focussed)
6860 				wstandout(view->window);
6861 			s->selected_entry = te;
6862 		}
6863 		tc = match_color(&s->colors, line);
6864 		if (tc)
6865 			wattr_on(view->window,
6866 			    COLOR_PAIR(tc->colorpair), NULL);
6867 		waddwstr(view->window, wline);
6868 		if (tc)
6869 			wattr_off(view->window,
6870 			    COLOR_PAIR(tc->colorpair), NULL);
6871 		if (width < view->ncols - 1)
6872 			waddch(view->window, '\n');
6873 		if (n == s->selected && view->focussed)
6874 			wstandend(view->window);
6875 		free(line);
6876 		free(wline);
6877 		wline = NULL;
6878 		n++;
6879 		s->ndisplayed++;
6880 		s->last_displayed_entry = te;
6881 		if (--limit <= 0)
6882 			break;
6883 	}
6884 
6885 	return err;
6886 }
6887 
6888 static void
6889 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6890 {
6891 	struct got_tree_entry *te;
6892 	int isroot = s->tree == s->root;
6893 	int i = 0;
6894 
6895 	if (s->first_displayed_entry == NULL)
6896 		return;
6897 
6898 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6899 	while (i++ < maxscroll) {
6900 		if (te == NULL) {
6901 			if (!isroot)
6902 				s->first_displayed_entry = NULL;
6903 			break;
6904 		}
6905 		s->first_displayed_entry = te;
6906 		te = got_tree_entry_get_prev(s->tree, te);
6907 	}
6908 }
6909 
6910 static const struct got_error *
6911 tree_scroll_down(struct tog_view *view, int maxscroll)
6912 {
6913 	struct tog_tree_view_state *s = &view->state.tree;
6914 	struct got_tree_entry *next, *last;
6915 	int n = 0;
6916 
6917 	if (s->first_displayed_entry)
6918 		next = got_tree_entry_get_next(s->tree,
6919 		    s->first_displayed_entry);
6920 	else
6921 		next = got_object_tree_get_first_entry(s->tree);
6922 
6923 	last = s->last_displayed_entry;
6924 	while (next && n++ < maxscroll) {
6925 		if (last) {
6926 			s->last_displayed_entry = last;
6927 			last = got_tree_entry_get_next(s->tree, last);
6928 		}
6929 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6930 			s->first_displayed_entry = next;
6931 			next = got_tree_entry_get_next(s->tree, next);
6932 		}
6933 	}
6934 
6935 	return NULL;
6936 }
6937 
6938 static const struct got_error *
6939 tree_entry_path(char **path, struct tog_parent_trees *parents,
6940     struct got_tree_entry *te)
6941 {
6942 	const struct got_error *err = NULL;
6943 	struct tog_parent_tree *pt;
6944 	size_t len = 2; /* for leading slash and NUL */
6945 
6946 	TAILQ_FOREACH(pt, parents, entry)
6947 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6948 		    + 1 /* slash */;
6949 	if (te)
6950 		len += strlen(got_tree_entry_get_name(te));
6951 
6952 	*path = calloc(1, len);
6953 	if (path == NULL)
6954 		return got_error_from_errno("calloc");
6955 
6956 	(*path)[0] = '/';
6957 	pt = TAILQ_LAST(parents, tog_parent_trees);
6958 	while (pt) {
6959 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6960 		if (strlcat(*path, name, len) >= len) {
6961 			err = got_error(GOT_ERR_NO_SPACE);
6962 			goto done;
6963 		}
6964 		if (strlcat(*path, "/", len) >= len) {
6965 			err = got_error(GOT_ERR_NO_SPACE);
6966 			goto done;
6967 		}
6968 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6969 	}
6970 	if (te) {
6971 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6972 			err = got_error(GOT_ERR_NO_SPACE);
6973 			goto done;
6974 		}
6975 	}
6976 done:
6977 	if (err) {
6978 		free(*path);
6979 		*path = NULL;
6980 	}
6981 	return err;
6982 }
6983 
6984 static const struct got_error *
6985 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6986     struct got_tree_entry *te, struct tog_parent_trees *parents,
6987     struct got_object_id *commit_id, struct got_repository *repo)
6988 {
6989 	const struct got_error *err = NULL;
6990 	char *path;
6991 	struct tog_view *blame_view;
6992 
6993 	*new_view = NULL;
6994 
6995 	err = tree_entry_path(&path, parents, te);
6996 	if (err)
6997 		return err;
6998 
6999 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7000 	if (blame_view == NULL) {
7001 		err = got_error_from_errno("view_open");
7002 		goto done;
7003 	}
7004 
7005 	err = open_blame_view(blame_view, path, commit_id, repo);
7006 	if (err) {
7007 		if (err->code == GOT_ERR_CANCELLED)
7008 			err = NULL;
7009 		view_close(blame_view);
7010 	} else
7011 		*new_view = blame_view;
7012 done:
7013 	free(path);
7014 	return err;
7015 }
7016 
7017 static const struct got_error *
7018 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7019     struct tog_tree_view_state *s)
7020 {
7021 	struct tog_view *log_view;
7022 	const struct got_error *err = NULL;
7023 	char *path;
7024 
7025 	*new_view = NULL;
7026 
7027 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7028 	if (log_view == NULL)
7029 		return got_error_from_errno("view_open");
7030 
7031 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7032 	if (err)
7033 		return err;
7034 
7035 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7036 	    path, 0);
7037 	if (err)
7038 		view_close(log_view);
7039 	else
7040 		*new_view = log_view;
7041 	free(path);
7042 	return err;
7043 }
7044 
7045 static const struct got_error *
7046 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7047     const char *head_ref_name, struct got_repository *repo)
7048 {
7049 	const struct got_error *err = NULL;
7050 	char *commit_id_str = NULL;
7051 	struct tog_tree_view_state *s = &view->state.tree;
7052 	struct got_commit_object *commit = NULL;
7053 
7054 	TAILQ_INIT(&s->parents);
7055 	STAILQ_INIT(&s->colors);
7056 
7057 	s->commit_id = got_object_id_dup(commit_id);
7058 	if (s->commit_id == NULL)
7059 		return got_error_from_errno("got_object_id_dup");
7060 
7061 	err = got_object_open_as_commit(&commit, repo, commit_id);
7062 	if (err)
7063 		goto done;
7064 
7065 	/*
7066 	 * The root is opened here and will be closed when the view is closed.
7067 	 * Any visited subtrees and their path-wise parents are opened and
7068 	 * closed on demand.
7069 	 */
7070 	err = got_object_open_as_tree(&s->root, repo,
7071 	    got_object_commit_get_tree_id(commit));
7072 	if (err)
7073 		goto done;
7074 	s->tree = s->root;
7075 
7076 	err = got_object_id_str(&commit_id_str, commit_id);
7077 	if (err != NULL)
7078 		goto done;
7079 
7080 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7081 		err = got_error_from_errno("asprintf");
7082 		goto done;
7083 	}
7084 
7085 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7086 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7087 	if (head_ref_name) {
7088 		s->head_ref_name = strdup(head_ref_name);
7089 		if (s->head_ref_name == NULL) {
7090 			err = got_error_from_errno("strdup");
7091 			goto done;
7092 		}
7093 	}
7094 	s->repo = repo;
7095 
7096 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7097 		err = add_color(&s->colors, "\\$$",
7098 		    TOG_COLOR_TREE_SUBMODULE,
7099 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7100 		if (err)
7101 			goto done;
7102 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7103 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7104 		if (err)
7105 			goto done;
7106 		err = add_color(&s->colors, "/$",
7107 		    TOG_COLOR_TREE_DIRECTORY,
7108 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7109 		if (err)
7110 			goto done;
7111 
7112 		err = add_color(&s->colors, "\\*$",
7113 		    TOG_COLOR_TREE_EXECUTABLE,
7114 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7115 		if (err)
7116 			goto done;
7117 
7118 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7119 		    get_color_value("TOG_COLOR_COMMIT"));
7120 		if (err)
7121 			goto done;
7122 	}
7123 
7124 	view->show = show_tree_view;
7125 	view->input = input_tree_view;
7126 	view->close = close_tree_view;
7127 	view->search_start = search_start_tree_view;
7128 	view->search_next = search_next_tree_view;
7129 done:
7130 	free(commit_id_str);
7131 	if (commit)
7132 		got_object_commit_close(commit);
7133 	if (err)
7134 		close_tree_view(view);
7135 	return err;
7136 }
7137 
7138 static const struct got_error *
7139 close_tree_view(struct tog_view *view)
7140 {
7141 	struct tog_tree_view_state *s = &view->state.tree;
7142 
7143 	free_colors(&s->colors);
7144 	free(s->tree_label);
7145 	s->tree_label = NULL;
7146 	free(s->commit_id);
7147 	s->commit_id = NULL;
7148 	free(s->head_ref_name);
7149 	s->head_ref_name = NULL;
7150 	while (!TAILQ_EMPTY(&s->parents)) {
7151 		struct tog_parent_tree *parent;
7152 		parent = TAILQ_FIRST(&s->parents);
7153 		TAILQ_REMOVE(&s->parents, parent, entry);
7154 		if (parent->tree != s->root)
7155 			got_object_tree_close(parent->tree);
7156 		free(parent);
7157 
7158 	}
7159 	if (s->tree != NULL && s->tree != s->root)
7160 		got_object_tree_close(s->tree);
7161 	if (s->root)
7162 		got_object_tree_close(s->root);
7163 	return NULL;
7164 }
7165 
7166 static const struct got_error *
7167 search_start_tree_view(struct tog_view *view)
7168 {
7169 	struct tog_tree_view_state *s = &view->state.tree;
7170 
7171 	s->matched_entry = NULL;
7172 	return NULL;
7173 }
7174 
7175 static int
7176 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7177 {
7178 	regmatch_t regmatch;
7179 
7180 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7181 	    0) == 0;
7182 }
7183 
7184 static const struct got_error *
7185 search_next_tree_view(struct tog_view *view)
7186 {
7187 	struct tog_tree_view_state *s = &view->state.tree;
7188 	struct got_tree_entry *te = NULL;
7189 
7190 	if (!view->searching) {
7191 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7192 		return NULL;
7193 	}
7194 
7195 	if (s->matched_entry) {
7196 		if (view->searching == TOG_SEARCH_FORWARD) {
7197 			if (s->selected_entry)
7198 				te = got_tree_entry_get_next(s->tree,
7199 				    s->selected_entry);
7200 			else
7201 				te = got_object_tree_get_first_entry(s->tree);
7202 		} else {
7203 			if (s->selected_entry == NULL)
7204 				te = got_object_tree_get_last_entry(s->tree);
7205 			else
7206 				te = got_tree_entry_get_prev(s->tree,
7207 				    s->selected_entry);
7208 		}
7209 	} else {
7210 		if (s->selected_entry)
7211 			te = s->selected_entry;
7212 		else if (view->searching == TOG_SEARCH_FORWARD)
7213 			te = got_object_tree_get_first_entry(s->tree);
7214 		else
7215 			te = got_object_tree_get_last_entry(s->tree);
7216 	}
7217 
7218 	while (1) {
7219 		if (te == NULL) {
7220 			if (s->matched_entry == NULL) {
7221 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7222 				return NULL;
7223 			}
7224 			if (view->searching == TOG_SEARCH_FORWARD)
7225 				te = got_object_tree_get_first_entry(s->tree);
7226 			else
7227 				te = got_object_tree_get_last_entry(s->tree);
7228 		}
7229 
7230 		if (match_tree_entry(te, &view->regex)) {
7231 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7232 			s->matched_entry = te;
7233 			break;
7234 		}
7235 
7236 		if (view->searching == TOG_SEARCH_FORWARD)
7237 			te = got_tree_entry_get_next(s->tree, te);
7238 		else
7239 			te = got_tree_entry_get_prev(s->tree, te);
7240 	}
7241 
7242 	if (s->matched_entry) {
7243 		s->first_displayed_entry = s->matched_entry;
7244 		s->selected = 0;
7245 	}
7246 
7247 	return NULL;
7248 }
7249 
7250 static const struct got_error *
7251 show_tree_view(struct tog_view *view)
7252 {
7253 	const struct got_error *err = NULL;
7254 	struct tog_tree_view_state *s = &view->state.tree;
7255 	char *parent_path;
7256 
7257 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7258 	if (err)
7259 		return err;
7260 
7261 	err = draw_tree_entries(view, parent_path);
7262 	free(parent_path);
7263 
7264 	view_border(view);
7265 	return err;
7266 }
7267 
7268 static const struct got_error *
7269 tree_goto_line(struct tog_view *view, int nlines)
7270 {
7271 	const struct got_error		 *err = NULL;
7272 	struct tog_tree_view_state	 *s = &view->state.tree;
7273 	struct got_tree_entry		**fte, **lte, **ste;
7274 	int				  g, last, first = 1, i = 1;
7275 	int				  root = s->tree == s->root;
7276 	int				  off = root ? 1 : 2;
7277 
7278 	g = view->gline;
7279 	view->gline = 0;
7280 
7281 	if (g == 0)
7282 		g = 1;
7283 	else if (g > got_object_tree_get_nentries(s->tree))
7284 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7285 
7286 	fte = &s->first_displayed_entry;
7287 	lte = &s->last_displayed_entry;
7288 	ste = &s->selected_entry;
7289 
7290 	if (*fte != NULL) {
7291 		first = got_tree_entry_get_index(*fte);
7292 		first += off;  /* account for ".." */
7293 	}
7294 	last = got_tree_entry_get_index(*lte);
7295 	last += off;
7296 
7297 	if (g >= first && g <= last && g - first < nlines) {
7298 		s->selected = g - first;
7299 		return NULL;	/* gline is on the current page */
7300 	}
7301 
7302 	if (*ste != NULL) {
7303 		i = got_tree_entry_get_index(*ste);
7304 		i += off;
7305 	}
7306 
7307 	if (i < g) {
7308 		err = tree_scroll_down(view, g - i);
7309 		if (err)
7310 			return err;
7311 		if (got_tree_entry_get_index(*lte) >=
7312 		    got_object_tree_get_nentries(s->tree) - 1 &&
7313 		    first + s->selected < g &&
7314 		    s->selected < s->ndisplayed - 1) {
7315 			first = got_tree_entry_get_index(*fte);
7316 			first += off;
7317 			s->selected = g - first;
7318 		}
7319 	} else if (i > g)
7320 		tree_scroll_up(s, i - g);
7321 
7322 	if (g < nlines &&
7323 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7324 		s->selected = g - 1;
7325 
7326 	return NULL;
7327 }
7328 
7329 static const struct got_error *
7330 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7331 {
7332 	const struct got_error *err = NULL;
7333 	struct tog_tree_view_state *s = &view->state.tree;
7334 	struct got_tree_entry *te;
7335 	int n, nscroll = view->nlines - 3;
7336 
7337 	if (view->gline)
7338 		return tree_goto_line(view, nscroll);
7339 
7340 	switch (ch) {
7341 	case 'i':
7342 		s->show_ids = !s->show_ids;
7343 		view->count = 0;
7344 		break;
7345 	case 'L':
7346 		view->count = 0;
7347 		if (!s->selected_entry)
7348 			break;
7349 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7350 		break;
7351 	case 'R':
7352 		view->count = 0;
7353 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7354 		break;
7355 	case 'g':
7356 	case '=':
7357 	case KEY_HOME:
7358 		s->selected = 0;
7359 		view->count = 0;
7360 		if (s->tree == s->root)
7361 			s->first_displayed_entry =
7362 			    got_object_tree_get_first_entry(s->tree);
7363 		else
7364 			s->first_displayed_entry = NULL;
7365 		break;
7366 	case 'G':
7367 	case '*':
7368 	case KEY_END: {
7369 		int eos = view->nlines - 3;
7370 
7371 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7372 			--eos;  /* border */
7373 		s->selected = 0;
7374 		view->count = 0;
7375 		te = got_object_tree_get_last_entry(s->tree);
7376 		for (n = 0; n < eos; n++) {
7377 			if (te == NULL) {
7378 				if (s->tree != s->root) {
7379 					s->first_displayed_entry = NULL;
7380 					n++;
7381 				}
7382 				break;
7383 			}
7384 			s->first_displayed_entry = te;
7385 			te = got_tree_entry_get_prev(s->tree, te);
7386 		}
7387 		if (n > 0)
7388 			s->selected = n - 1;
7389 		break;
7390 	}
7391 	case 'k':
7392 	case KEY_UP:
7393 	case CTRL('p'):
7394 		if (s->selected > 0) {
7395 			s->selected--;
7396 			break;
7397 		}
7398 		tree_scroll_up(s, 1);
7399 		if (s->selected_entry == NULL ||
7400 		    (s->tree == s->root && s->selected_entry ==
7401 		     got_object_tree_get_first_entry(s->tree)))
7402 			view->count = 0;
7403 		break;
7404 	case CTRL('u'):
7405 	case 'u':
7406 		nscroll /= 2;
7407 		/* FALL THROUGH */
7408 	case KEY_PPAGE:
7409 	case CTRL('b'):
7410 	case 'b':
7411 		if (s->tree == s->root) {
7412 			if (got_object_tree_get_first_entry(s->tree) ==
7413 			    s->first_displayed_entry)
7414 				s->selected -= MIN(s->selected, nscroll);
7415 		} else {
7416 			if (s->first_displayed_entry == NULL)
7417 				s->selected -= MIN(s->selected, nscroll);
7418 		}
7419 		tree_scroll_up(s, MAX(0, nscroll));
7420 		if (s->selected_entry == NULL ||
7421 		    (s->tree == s->root && s->selected_entry ==
7422 		     got_object_tree_get_first_entry(s->tree)))
7423 			view->count = 0;
7424 		break;
7425 	case 'j':
7426 	case KEY_DOWN:
7427 	case CTRL('n'):
7428 		if (s->selected < s->ndisplayed - 1) {
7429 			s->selected++;
7430 			break;
7431 		}
7432 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7433 		    == NULL) {
7434 			/* can't scroll any further */
7435 			view->count = 0;
7436 			break;
7437 		}
7438 		tree_scroll_down(view, 1);
7439 		break;
7440 	case CTRL('d'):
7441 	case 'd':
7442 		nscroll /= 2;
7443 		/* FALL THROUGH */
7444 	case KEY_NPAGE:
7445 	case CTRL('f'):
7446 	case 'f':
7447 	case ' ':
7448 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7449 		    == NULL) {
7450 			/* can't scroll any further; move cursor down */
7451 			if (s->selected < s->ndisplayed - 1)
7452 				s->selected += MIN(nscroll,
7453 				    s->ndisplayed - s->selected - 1);
7454 			else
7455 				view->count = 0;
7456 			break;
7457 		}
7458 		tree_scroll_down(view, nscroll);
7459 		break;
7460 	case KEY_ENTER:
7461 	case '\r':
7462 	case KEY_BACKSPACE:
7463 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7464 			struct tog_parent_tree *parent;
7465 			/* user selected '..' */
7466 			if (s->tree == s->root) {
7467 				view->count = 0;
7468 				break;
7469 			}
7470 			parent = TAILQ_FIRST(&s->parents);
7471 			TAILQ_REMOVE(&s->parents, parent,
7472 			    entry);
7473 			got_object_tree_close(s->tree);
7474 			s->tree = parent->tree;
7475 			s->first_displayed_entry =
7476 			    parent->first_displayed_entry;
7477 			s->selected_entry =
7478 			    parent->selected_entry;
7479 			s->selected = parent->selected;
7480 			if (s->selected > view->nlines - 3) {
7481 				err = offset_selection_down(view);
7482 				if (err)
7483 					break;
7484 			}
7485 			free(parent);
7486 		} else if (S_ISDIR(got_tree_entry_get_mode(
7487 		    s->selected_entry))) {
7488 			struct got_tree_object *subtree;
7489 			view->count = 0;
7490 			err = got_object_open_as_tree(&subtree, s->repo,
7491 			    got_tree_entry_get_id(s->selected_entry));
7492 			if (err)
7493 				break;
7494 			err = tree_view_visit_subtree(s, subtree);
7495 			if (err) {
7496 				got_object_tree_close(subtree);
7497 				break;
7498 			}
7499 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7500 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7501 		break;
7502 	case KEY_RESIZE:
7503 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7504 			s->selected = view->nlines - 4;
7505 		view->count = 0;
7506 		break;
7507 	default:
7508 		view->count = 0;
7509 		break;
7510 	}
7511 
7512 	return err;
7513 }
7514 
7515 __dead static void
7516 usage_tree(void)
7517 {
7518 	endwin();
7519 	fprintf(stderr,
7520 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7521 	    getprogname());
7522 	exit(1);
7523 }
7524 
7525 static const struct got_error *
7526 cmd_tree(int argc, char *argv[])
7527 {
7528 	const struct got_error *error;
7529 	struct got_repository *repo = NULL;
7530 	struct got_worktree *worktree = NULL;
7531 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7532 	struct got_object_id *commit_id = NULL;
7533 	struct got_commit_object *commit = NULL;
7534 	const char *commit_id_arg = NULL;
7535 	char *label = NULL;
7536 	struct got_reference *ref = NULL;
7537 	const char *head_ref_name = NULL;
7538 	int ch;
7539 	struct tog_view *view;
7540 	int *pack_fds = NULL;
7541 
7542 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7543 		switch (ch) {
7544 		case 'c':
7545 			commit_id_arg = optarg;
7546 			break;
7547 		case 'r':
7548 			repo_path = realpath(optarg, NULL);
7549 			if (repo_path == NULL)
7550 				return got_error_from_errno2("realpath",
7551 				    optarg);
7552 			break;
7553 		default:
7554 			usage_tree();
7555 			/* NOTREACHED */
7556 		}
7557 	}
7558 
7559 	argc -= optind;
7560 	argv += optind;
7561 
7562 	if (argc > 1)
7563 		usage_tree();
7564 
7565 	error = got_repo_pack_fds_open(&pack_fds);
7566 	if (error != NULL)
7567 		goto done;
7568 
7569 	if (repo_path == NULL) {
7570 		cwd = getcwd(NULL, 0);
7571 		if (cwd == NULL)
7572 			return got_error_from_errno("getcwd");
7573 		error = got_worktree_open(&worktree, cwd);
7574 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7575 			goto done;
7576 		if (worktree)
7577 			repo_path =
7578 			    strdup(got_worktree_get_repo_path(worktree));
7579 		else
7580 			repo_path = strdup(cwd);
7581 		if (repo_path == NULL) {
7582 			error = got_error_from_errno("strdup");
7583 			goto done;
7584 		}
7585 	}
7586 
7587 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7588 	if (error != NULL)
7589 		goto done;
7590 
7591 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7592 	    repo, worktree);
7593 	if (error)
7594 		goto done;
7595 
7596 	init_curses();
7597 
7598 	error = apply_unveil(got_repo_get_path(repo), NULL);
7599 	if (error)
7600 		goto done;
7601 
7602 	error = tog_load_refs(repo, 0);
7603 	if (error)
7604 		goto done;
7605 
7606 	if (commit_id_arg == NULL) {
7607 		error = got_repo_match_object_id(&commit_id, &label,
7608 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7609 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7610 		if (error)
7611 			goto done;
7612 		head_ref_name = label;
7613 	} else {
7614 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7615 		if (error == NULL)
7616 			head_ref_name = got_ref_get_name(ref);
7617 		else if (error->code != GOT_ERR_NOT_REF)
7618 			goto done;
7619 		error = got_repo_match_object_id(&commit_id, NULL,
7620 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7621 		if (error)
7622 			goto done;
7623 	}
7624 
7625 	error = got_object_open_as_commit(&commit, repo, commit_id);
7626 	if (error)
7627 		goto done;
7628 
7629 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7630 	if (view == NULL) {
7631 		error = got_error_from_errno("view_open");
7632 		goto done;
7633 	}
7634 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7635 	if (error)
7636 		goto done;
7637 	if (!got_path_is_root_dir(in_repo_path)) {
7638 		error = tree_view_walk_path(&view->state.tree, commit,
7639 		    in_repo_path);
7640 		if (error)
7641 			goto done;
7642 	}
7643 
7644 	if (worktree) {
7645 		/* Release work tree lock. */
7646 		got_worktree_close(worktree);
7647 		worktree = NULL;
7648 	}
7649 	error = view_loop(view);
7650 done:
7651 	free(repo_path);
7652 	free(cwd);
7653 	free(commit_id);
7654 	free(label);
7655 	if (ref)
7656 		got_ref_close(ref);
7657 	if (repo) {
7658 		const struct got_error *close_err = got_repo_close(repo);
7659 		if (error == NULL)
7660 			error = close_err;
7661 	}
7662 	if (pack_fds) {
7663 		const struct got_error *pack_err =
7664 		    got_repo_pack_fds_close(pack_fds);
7665 		if (error == NULL)
7666 			error = pack_err;
7667 	}
7668 	tog_free_refs();
7669 	return error;
7670 }
7671 
7672 static const struct got_error *
7673 ref_view_load_refs(struct tog_ref_view_state *s)
7674 {
7675 	struct got_reflist_entry *sre;
7676 	struct tog_reflist_entry *re;
7677 
7678 	s->nrefs = 0;
7679 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7680 		if (strncmp(got_ref_get_name(sre->ref),
7681 		    "refs/got/", 9) == 0 &&
7682 		    strncmp(got_ref_get_name(sre->ref),
7683 		    "refs/got/backup/", 16) != 0)
7684 			continue;
7685 
7686 		re = malloc(sizeof(*re));
7687 		if (re == NULL)
7688 			return got_error_from_errno("malloc");
7689 
7690 		re->ref = got_ref_dup(sre->ref);
7691 		if (re->ref == NULL)
7692 			return got_error_from_errno("got_ref_dup");
7693 		re->idx = s->nrefs++;
7694 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7695 	}
7696 
7697 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7698 	return NULL;
7699 }
7700 
7701 static void
7702 ref_view_free_refs(struct tog_ref_view_state *s)
7703 {
7704 	struct tog_reflist_entry *re;
7705 
7706 	while (!TAILQ_EMPTY(&s->refs)) {
7707 		re = TAILQ_FIRST(&s->refs);
7708 		TAILQ_REMOVE(&s->refs, re, entry);
7709 		got_ref_close(re->ref);
7710 		free(re);
7711 	}
7712 }
7713 
7714 static const struct got_error *
7715 open_ref_view(struct tog_view *view, struct got_repository *repo)
7716 {
7717 	const struct got_error *err = NULL;
7718 	struct tog_ref_view_state *s = &view->state.ref;
7719 
7720 	s->selected_entry = 0;
7721 	s->repo = repo;
7722 
7723 	TAILQ_INIT(&s->refs);
7724 	STAILQ_INIT(&s->colors);
7725 
7726 	err = ref_view_load_refs(s);
7727 	if (err)
7728 		return err;
7729 
7730 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7731 		err = add_color(&s->colors, "^refs/heads/",
7732 		    TOG_COLOR_REFS_HEADS,
7733 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7734 		if (err)
7735 			goto done;
7736 
7737 		err = add_color(&s->colors, "^refs/tags/",
7738 		    TOG_COLOR_REFS_TAGS,
7739 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7740 		if (err)
7741 			goto done;
7742 
7743 		err = add_color(&s->colors, "^refs/remotes/",
7744 		    TOG_COLOR_REFS_REMOTES,
7745 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7746 		if (err)
7747 			goto done;
7748 
7749 		err = add_color(&s->colors, "^refs/got/backup/",
7750 		    TOG_COLOR_REFS_BACKUP,
7751 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7752 		if (err)
7753 			goto done;
7754 	}
7755 
7756 	view->show = show_ref_view;
7757 	view->input = input_ref_view;
7758 	view->close = close_ref_view;
7759 	view->search_start = search_start_ref_view;
7760 	view->search_next = search_next_ref_view;
7761 done:
7762 	if (err)
7763 		free_colors(&s->colors);
7764 	return err;
7765 }
7766 
7767 static const struct got_error *
7768 close_ref_view(struct tog_view *view)
7769 {
7770 	struct tog_ref_view_state *s = &view->state.ref;
7771 
7772 	ref_view_free_refs(s);
7773 	free_colors(&s->colors);
7774 
7775 	return NULL;
7776 }
7777 
7778 static const struct got_error *
7779 resolve_reflist_entry(struct got_object_id **commit_id,
7780     struct tog_reflist_entry *re, struct got_repository *repo)
7781 {
7782 	const struct got_error *err = NULL;
7783 	struct got_object_id *obj_id;
7784 	struct got_tag_object *tag = NULL;
7785 	int obj_type;
7786 
7787 	*commit_id = NULL;
7788 
7789 	err = got_ref_resolve(&obj_id, repo, re->ref);
7790 	if (err)
7791 		return err;
7792 
7793 	err = got_object_get_type(&obj_type, repo, obj_id);
7794 	if (err)
7795 		goto done;
7796 
7797 	switch (obj_type) {
7798 	case GOT_OBJ_TYPE_COMMIT:
7799 		*commit_id = obj_id;
7800 		break;
7801 	case GOT_OBJ_TYPE_TAG:
7802 		err = got_object_open_as_tag(&tag, repo, obj_id);
7803 		if (err)
7804 			goto done;
7805 		free(obj_id);
7806 		err = got_object_get_type(&obj_type, repo,
7807 		    got_object_tag_get_object_id(tag));
7808 		if (err)
7809 			goto done;
7810 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7811 			err = got_error(GOT_ERR_OBJ_TYPE);
7812 			goto done;
7813 		}
7814 		*commit_id = got_object_id_dup(
7815 		    got_object_tag_get_object_id(tag));
7816 		if (*commit_id == NULL) {
7817 			err = got_error_from_errno("got_object_id_dup");
7818 			goto done;
7819 		}
7820 		break;
7821 	default:
7822 		err = got_error(GOT_ERR_OBJ_TYPE);
7823 		break;
7824 	}
7825 
7826 done:
7827 	if (tag)
7828 		got_object_tag_close(tag);
7829 	if (err) {
7830 		free(*commit_id);
7831 		*commit_id = NULL;
7832 	}
7833 	return err;
7834 }
7835 
7836 static const struct got_error *
7837 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7838     struct tog_reflist_entry *re, struct got_repository *repo)
7839 {
7840 	struct tog_view *log_view;
7841 	const struct got_error *err = NULL;
7842 	struct got_object_id *commit_id = NULL;
7843 
7844 	*new_view = NULL;
7845 
7846 	err = resolve_reflist_entry(&commit_id, re, repo);
7847 	if (err) {
7848 		if (err->code != GOT_ERR_OBJ_TYPE)
7849 			return err;
7850 		else
7851 			return NULL;
7852 	}
7853 
7854 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7855 	if (log_view == NULL) {
7856 		err = got_error_from_errno("view_open");
7857 		goto done;
7858 	}
7859 
7860 	err = open_log_view(log_view, commit_id, repo,
7861 	    got_ref_get_name(re->ref), "", 0);
7862 done:
7863 	if (err)
7864 		view_close(log_view);
7865 	else
7866 		*new_view = log_view;
7867 	free(commit_id);
7868 	return err;
7869 }
7870 
7871 static void
7872 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7873 {
7874 	struct tog_reflist_entry *re;
7875 	int i = 0;
7876 
7877 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7878 		return;
7879 
7880 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7881 	while (i++ < maxscroll) {
7882 		if (re == NULL)
7883 			break;
7884 		s->first_displayed_entry = re;
7885 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7886 	}
7887 }
7888 
7889 static const struct got_error *
7890 ref_scroll_down(struct tog_view *view, int maxscroll)
7891 {
7892 	struct tog_ref_view_state *s = &view->state.ref;
7893 	struct tog_reflist_entry *next, *last;
7894 	int n = 0;
7895 
7896 	if (s->first_displayed_entry)
7897 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7898 	else
7899 		next = TAILQ_FIRST(&s->refs);
7900 
7901 	last = s->last_displayed_entry;
7902 	while (next && n++ < maxscroll) {
7903 		if (last) {
7904 			s->last_displayed_entry = last;
7905 			last = TAILQ_NEXT(last, entry);
7906 		}
7907 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7908 			s->first_displayed_entry = next;
7909 			next = TAILQ_NEXT(next, entry);
7910 		}
7911 	}
7912 
7913 	return NULL;
7914 }
7915 
7916 static const struct got_error *
7917 search_start_ref_view(struct tog_view *view)
7918 {
7919 	struct tog_ref_view_state *s = &view->state.ref;
7920 
7921 	s->matched_entry = NULL;
7922 	return NULL;
7923 }
7924 
7925 static int
7926 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7927 {
7928 	regmatch_t regmatch;
7929 
7930 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7931 	    0) == 0;
7932 }
7933 
7934 static const struct got_error *
7935 search_next_ref_view(struct tog_view *view)
7936 {
7937 	struct tog_ref_view_state *s = &view->state.ref;
7938 	struct tog_reflist_entry *re = NULL;
7939 
7940 	if (!view->searching) {
7941 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7942 		return NULL;
7943 	}
7944 
7945 	if (s->matched_entry) {
7946 		if (view->searching == TOG_SEARCH_FORWARD) {
7947 			if (s->selected_entry)
7948 				re = TAILQ_NEXT(s->selected_entry, entry);
7949 			else
7950 				re = TAILQ_PREV(s->selected_entry,
7951 				    tog_reflist_head, entry);
7952 		} else {
7953 			if (s->selected_entry == NULL)
7954 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7955 			else
7956 				re = TAILQ_PREV(s->selected_entry,
7957 				    tog_reflist_head, entry);
7958 		}
7959 	} else {
7960 		if (s->selected_entry)
7961 			re = s->selected_entry;
7962 		else if (view->searching == TOG_SEARCH_FORWARD)
7963 			re = TAILQ_FIRST(&s->refs);
7964 		else
7965 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7966 	}
7967 
7968 	while (1) {
7969 		if (re == NULL) {
7970 			if (s->matched_entry == NULL) {
7971 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7972 				return NULL;
7973 			}
7974 			if (view->searching == TOG_SEARCH_FORWARD)
7975 				re = TAILQ_FIRST(&s->refs);
7976 			else
7977 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7978 		}
7979 
7980 		if (match_reflist_entry(re, &view->regex)) {
7981 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7982 			s->matched_entry = re;
7983 			break;
7984 		}
7985 
7986 		if (view->searching == TOG_SEARCH_FORWARD)
7987 			re = TAILQ_NEXT(re, entry);
7988 		else
7989 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7990 	}
7991 
7992 	if (s->matched_entry) {
7993 		s->first_displayed_entry = s->matched_entry;
7994 		s->selected = 0;
7995 	}
7996 
7997 	return NULL;
7998 }
7999 
8000 static const struct got_error *
8001 show_ref_view(struct tog_view *view)
8002 {
8003 	const struct got_error *err = NULL;
8004 	struct tog_ref_view_state *s = &view->state.ref;
8005 	struct tog_reflist_entry *re;
8006 	char *line = NULL;
8007 	wchar_t *wline;
8008 	struct tog_color *tc;
8009 	int width, n;
8010 	int limit = view->nlines;
8011 
8012 	werase(view->window);
8013 
8014 	s->ndisplayed = 0;
8015 	if (view_is_hsplit_top(view))
8016 		--limit;  /* border */
8017 
8018 	if (limit == 0)
8019 		return NULL;
8020 
8021 	re = s->first_displayed_entry;
8022 
8023 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8024 	    s->nrefs) == -1)
8025 		return got_error_from_errno("asprintf");
8026 
8027 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8028 	if (err) {
8029 		free(line);
8030 		return err;
8031 	}
8032 	if (view_needs_focus_indication(view))
8033 		wstandout(view->window);
8034 	waddwstr(view->window, wline);
8035 	while (width++ < view->ncols)
8036 		waddch(view->window, ' ');
8037 	if (view_needs_focus_indication(view))
8038 		wstandend(view->window);
8039 	free(wline);
8040 	wline = NULL;
8041 	free(line);
8042 	line = NULL;
8043 	if (--limit <= 0)
8044 		return NULL;
8045 
8046 	n = 0;
8047 	while (re && limit > 0) {
8048 		char *line = NULL;
8049 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8050 
8051 		if (s->show_date) {
8052 			struct got_commit_object *ci;
8053 			struct got_tag_object *tag;
8054 			struct got_object_id *id;
8055 			struct tm tm;
8056 			time_t t;
8057 
8058 			err = got_ref_resolve(&id, s->repo, re->ref);
8059 			if (err)
8060 				return err;
8061 			err = got_object_open_as_tag(&tag, s->repo, id);
8062 			if (err) {
8063 				if (err->code != GOT_ERR_OBJ_TYPE) {
8064 					free(id);
8065 					return err;
8066 				}
8067 				err = got_object_open_as_commit(&ci, s->repo,
8068 				    id);
8069 				if (err) {
8070 					free(id);
8071 					return err;
8072 				}
8073 				t = got_object_commit_get_committer_time(ci);
8074 				got_object_commit_close(ci);
8075 			} else {
8076 				t = got_object_tag_get_tagger_time(tag);
8077 				got_object_tag_close(tag);
8078 			}
8079 			free(id);
8080 			if (gmtime_r(&t, &tm) == NULL)
8081 				return got_error_from_errno("gmtime_r");
8082 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8083 				return got_error(GOT_ERR_NO_SPACE);
8084 		}
8085 		if (got_ref_is_symbolic(re->ref)) {
8086 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8087 			    ymd : "", got_ref_get_name(re->ref),
8088 			    got_ref_get_symref_target(re->ref)) == -1)
8089 				return got_error_from_errno("asprintf");
8090 		} else if (s->show_ids) {
8091 			struct got_object_id *id;
8092 			char *id_str;
8093 			err = got_ref_resolve(&id, s->repo, re->ref);
8094 			if (err)
8095 				return err;
8096 			err = got_object_id_str(&id_str, id);
8097 			if (err) {
8098 				free(id);
8099 				return err;
8100 			}
8101 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8102 			    got_ref_get_name(re->ref), id_str) == -1) {
8103 				err = got_error_from_errno("asprintf");
8104 				free(id);
8105 				free(id_str);
8106 				return err;
8107 			}
8108 			free(id);
8109 			free(id_str);
8110 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8111 		    got_ref_get_name(re->ref)) == -1)
8112 			return got_error_from_errno("asprintf");
8113 
8114 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8115 		    0, 0);
8116 		if (err) {
8117 			free(line);
8118 			return err;
8119 		}
8120 		if (n == s->selected) {
8121 			if (view->focussed)
8122 				wstandout(view->window);
8123 			s->selected_entry = re;
8124 		}
8125 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8126 		if (tc)
8127 			wattr_on(view->window,
8128 			    COLOR_PAIR(tc->colorpair), NULL);
8129 		waddwstr(view->window, wline);
8130 		if (tc)
8131 			wattr_off(view->window,
8132 			    COLOR_PAIR(tc->colorpair), NULL);
8133 		if (width < view->ncols - 1)
8134 			waddch(view->window, '\n');
8135 		if (n == s->selected && view->focussed)
8136 			wstandend(view->window);
8137 		free(line);
8138 		free(wline);
8139 		wline = NULL;
8140 		n++;
8141 		s->ndisplayed++;
8142 		s->last_displayed_entry = re;
8143 
8144 		limit--;
8145 		re = TAILQ_NEXT(re, entry);
8146 	}
8147 
8148 	view_border(view);
8149 	return err;
8150 }
8151 
8152 static const struct got_error *
8153 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8154     struct tog_reflist_entry *re, struct got_repository *repo)
8155 {
8156 	const struct got_error *err = NULL;
8157 	struct got_object_id *commit_id = NULL;
8158 	struct tog_view *tree_view;
8159 
8160 	*new_view = NULL;
8161 
8162 	err = resolve_reflist_entry(&commit_id, re, repo);
8163 	if (err) {
8164 		if (err->code != GOT_ERR_OBJ_TYPE)
8165 			return err;
8166 		else
8167 			return NULL;
8168 	}
8169 
8170 
8171 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8172 	if (tree_view == NULL) {
8173 		err = got_error_from_errno("view_open");
8174 		goto done;
8175 	}
8176 
8177 	err = open_tree_view(tree_view, commit_id,
8178 	    got_ref_get_name(re->ref), repo);
8179 	if (err)
8180 		goto done;
8181 
8182 	*new_view = tree_view;
8183 done:
8184 	free(commit_id);
8185 	return err;
8186 }
8187 
8188 static const struct got_error *
8189 ref_goto_line(struct tog_view *view, int nlines)
8190 {
8191 	const struct got_error		*err = NULL;
8192 	struct tog_ref_view_state	*s = &view->state.ref;
8193 	int				 g, idx = s->selected_entry->idx;
8194 
8195 	g = view->gline;
8196 	view->gline = 0;
8197 
8198 	if (g == 0)
8199 		g = 1;
8200 	else if (g > s->nrefs)
8201 		g = s->nrefs;
8202 
8203 	if (g >= s->first_displayed_entry->idx + 1 &&
8204 	    g <= s->last_displayed_entry->idx + 1 &&
8205 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8206 		s->selected = g - s->first_displayed_entry->idx - 1;
8207 		return NULL;
8208 	}
8209 
8210 	if (idx + 1 < g) {
8211 		err = ref_scroll_down(view, g - idx - 1);
8212 		if (err)
8213 			return err;
8214 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8215 		    s->first_displayed_entry->idx + s->selected < g &&
8216 		    s->selected < s->ndisplayed - 1)
8217 			s->selected = g - s->first_displayed_entry->idx - 1;
8218 	} else if (idx + 1 > g)
8219 		ref_scroll_up(s, idx - g + 1);
8220 
8221 	if (g < nlines && s->first_displayed_entry->idx == 0)
8222 		s->selected = g - 1;
8223 
8224 	return NULL;
8225 
8226 }
8227 
8228 static const struct got_error *
8229 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8230 {
8231 	const struct got_error *err = NULL;
8232 	struct tog_ref_view_state *s = &view->state.ref;
8233 	struct tog_reflist_entry *re;
8234 	int n, nscroll = view->nlines - 1;
8235 
8236 	if (view->gline)
8237 		return ref_goto_line(view, nscroll);
8238 
8239 	switch (ch) {
8240 	case 'i':
8241 		s->show_ids = !s->show_ids;
8242 		view->count = 0;
8243 		break;
8244 	case 'm':
8245 		s->show_date = !s->show_date;
8246 		view->count = 0;
8247 		break;
8248 	case 'o':
8249 		s->sort_by_date = !s->sort_by_date;
8250 		view->count = 0;
8251 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8252 		    got_ref_cmp_by_commit_timestamp_descending :
8253 		    tog_ref_cmp_by_name, s->repo);
8254 		if (err)
8255 			break;
8256 		got_reflist_object_id_map_free(tog_refs_idmap);
8257 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8258 		    &tog_refs, s->repo);
8259 		if (err)
8260 			break;
8261 		ref_view_free_refs(s);
8262 		err = ref_view_load_refs(s);
8263 		break;
8264 	case KEY_ENTER:
8265 	case '\r':
8266 		view->count = 0;
8267 		if (!s->selected_entry)
8268 			break;
8269 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8270 		break;
8271 	case 'T':
8272 		view->count = 0;
8273 		if (!s->selected_entry)
8274 			break;
8275 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8276 		break;
8277 	case 'g':
8278 	case '=':
8279 	case KEY_HOME:
8280 		s->selected = 0;
8281 		view->count = 0;
8282 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8283 		break;
8284 	case 'G':
8285 	case '*':
8286 	case KEY_END: {
8287 		int eos = view->nlines - 1;
8288 
8289 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8290 			--eos;  /* border */
8291 		s->selected = 0;
8292 		view->count = 0;
8293 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8294 		for (n = 0; n < eos; n++) {
8295 			if (re == NULL)
8296 				break;
8297 			s->first_displayed_entry = re;
8298 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8299 		}
8300 		if (n > 0)
8301 			s->selected = n - 1;
8302 		break;
8303 	}
8304 	case 'k':
8305 	case KEY_UP:
8306 	case CTRL('p'):
8307 		if (s->selected > 0) {
8308 			s->selected--;
8309 			break;
8310 		}
8311 		ref_scroll_up(s, 1);
8312 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8313 			view->count = 0;
8314 		break;
8315 	case CTRL('u'):
8316 	case 'u':
8317 		nscroll /= 2;
8318 		/* FALL THROUGH */
8319 	case KEY_PPAGE:
8320 	case CTRL('b'):
8321 	case 'b':
8322 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8323 			s->selected -= MIN(nscroll, s->selected);
8324 		ref_scroll_up(s, MAX(0, nscroll));
8325 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8326 			view->count = 0;
8327 		break;
8328 	case 'j':
8329 	case KEY_DOWN:
8330 	case CTRL('n'):
8331 		if (s->selected < s->ndisplayed - 1) {
8332 			s->selected++;
8333 			break;
8334 		}
8335 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8336 			/* can't scroll any further */
8337 			view->count = 0;
8338 			break;
8339 		}
8340 		ref_scroll_down(view, 1);
8341 		break;
8342 	case CTRL('d'):
8343 	case 'd':
8344 		nscroll /= 2;
8345 		/* FALL THROUGH */
8346 	case KEY_NPAGE:
8347 	case CTRL('f'):
8348 	case 'f':
8349 	case ' ':
8350 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8351 			/* can't scroll any further; move cursor down */
8352 			if (s->selected < s->ndisplayed - 1)
8353 				s->selected += MIN(nscroll,
8354 				    s->ndisplayed - s->selected - 1);
8355 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8356 				s->selected += s->ndisplayed - s->selected - 1;
8357 			view->count = 0;
8358 			break;
8359 		}
8360 		ref_scroll_down(view, nscroll);
8361 		break;
8362 	case CTRL('l'):
8363 		view->count = 0;
8364 		tog_free_refs();
8365 		err = tog_load_refs(s->repo, s->sort_by_date);
8366 		if (err)
8367 			break;
8368 		ref_view_free_refs(s);
8369 		err = ref_view_load_refs(s);
8370 		break;
8371 	case KEY_RESIZE:
8372 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8373 			s->selected = view->nlines - 2;
8374 		break;
8375 	default:
8376 		view->count = 0;
8377 		break;
8378 	}
8379 
8380 	return err;
8381 }
8382 
8383 __dead static void
8384 usage_ref(void)
8385 {
8386 	endwin();
8387 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8388 	    getprogname());
8389 	exit(1);
8390 }
8391 
8392 static const struct got_error *
8393 cmd_ref(int argc, char *argv[])
8394 {
8395 	const struct got_error *error;
8396 	struct got_repository *repo = NULL;
8397 	struct got_worktree *worktree = NULL;
8398 	char *cwd = NULL, *repo_path = NULL;
8399 	int ch;
8400 	struct tog_view *view;
8401 	int *pack_fds = NULL;
8402 
8403 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8404 		switch (ch) {
8405 		case 'r':
8406 			repo_path = realpath(optarg, NULL);
8407 			if (repo_path == NULL)
8408 				return got_error_from_errno2("realpath",
8409 				    optarg);
8410 			break;
8411 		default:
8412 			usage_ref();
8413 			/* NOTREACHED */
8414 		}
8415 	}
8416 
8417 	argc -= optind;
8418 	argv += optind;
8419 
8420 	if (argc > 1)
8421 		usage_ref();
8422 
8423 	error = got_repo_pack_fds_open(&pack_fds);
8424 	if (error != NULL)
8425 		goto done;
8426 
8427 	if (repo_path == NULL) {
8428 		cwd = getcwd(NULL, 0);
8429 		if (cwd == NULL)
8430 			return got_error_from_errno("getcwd");
8431 		error = got_worktree_open(&worktree, cwd);
8432 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8433 			goto done;
8434 		if (worktree)
8435 			repo_path =
8436 			    strdup(got_worktree_get_repo_path(worktree));
8437 		else
8438 			repo_path = strdup(cwd);
8439 		if (repo_path == NULL) {
8440 			error = got_error_from_errno("strdup");
8441 			goto done;
8442 		}
8443 	}
8444 
8445 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8446 	if (error != NULL)
8447 		goto done;
8448 
8449 	init_curses();
8450 
8451 	error = apply_unveil(got_repo_get_path(repo), NULL);
8452 	if (error)
8453 		goto done;
8454 
8455 	error = tog_load_refs(repo, 0);
8456 	if (error)
8457 		goto done;
8458 
8459 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8460 	if (view == NULL) {
8461 		error = got_error_from_errno("view_open");
8462 		goto done;
8463 	}
8464 
8465 	error = open_ref_view(view, repo);
8466 	if (error)
8467 		goto done;
8468 
8469 	if (worktree) {
8470 		/* Release work tree lock. */
8471 		got_worktree_close(worktree);
8472 		worktree = NULL;
8473 	}
8474 	error = view_loop(view);
8475 done:
8476 	free(repo_path);
8477 	free(cwd);
8478 	if (repo) {
8479 		const struct got_error *close_err = got_repo_close(repo);
8480 		if (close_err)
8481 			error = close_err;
8482 	}
8483 	if (pack_fds) {
8484 		const struct got_error *pack_err =
8485 		    got_repo_pack_fds_close(pack_fds);
8486 		if (error == NULL)
8487 			error = pack_err;
8488 	}
8489 	tog_free_refs();
8490 	return error;
8491 }
8492 
8493 static const struct got_error*
8494 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8495     const char *str)
8496 {
8497 	size_t len;
8498 
8499 	if (win == NULL)
8500 		win = stdscr;
8501 
8502 	len = strlen(str);
8503 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8504 
8505 	if (focus)
8506 		wstandout(win);
8507 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8508 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8509 	if (focus)
8510 		wstandend(win);
8511 
8512 	return NULL;
8513 }
8514 
8515 static const struct got_error *
8516 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8517 {
8518 	off_t *p;
8519 
8520 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8521 	if (p == NULL) {
8522 		free(*line_offsets);
8523 		*line_offsets = NULL;
8524 		return got_error_from_errno("reallocarray");
8525 	}
8526 
8527 	*line_offsets = p;
8528 	(*line_offsets)[*nlines] = off;
8529 	++(*nlines);
8530 	return NULL;
8531 }
8532 
8533 static const struct got_error *
8534 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8535 {
8536 	*ret = 0;
8537 
8538 	for (;n > 0; --n, ++km) {
8539 		char	*t0, *t, *k;
8540 		size_t	 len = 1;
8541 
8542 		if (km->keys == NULL)
8543 			continue;
8544 
8545 		t = t0 = strdup(km->keys);
8546 		if (t0 == NULL)
8547 			return got_error_from_errno("strdup");
8548 
8549 		len += strlen(t);
8550 		while ((k = strsep(&t, " ")) != NULL)
8551 			len += strlen(k) > 1 ? 2 : 0;
8552 		free(t0);
8553 		*ret = MAX(*ret, len);
8554 	}
8555 
8556 	return NULL;
8557 }
8558 
8559 /*
8560  * Write keymap section headers, keys, and key info in km to f.
8561  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8562  * wrap control and symbolic keys in guillemets, else use <>.
8563  */
8564 static const struct got_error *
8565 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8566 {
8567 	int n, len = width;
8568 
8569 	if (km->keys) {
8570 		static const char *u8_glyph[] = {
8571 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8572 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8573 		};
8574 		char	*t0, *t, *k;
8575 		int	 cs, s, first = 1;
8576 
8577 		cs = got_locale_is_utf8();
8578 
8579 		t = t0 = strdup(km->keys);
8580 		if (t0 == NULL)
8581 			return got_error_from_errno("strdup");
8582 
8583 		len = strlen(km->keys);
8584 		while ((k = strsep(&t, " ")) != NULL) {
8585 			s = strlen(k) > 1;  /* control or symbolic key */
8586 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8587 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8588 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8589 			if (n < 0) {
8590 				free(t0);
8591 				return got_error_from_errno("fprintf");
8592 			}
8593 			first = 0;
8594 			len += s ? 2 : 0;
8595 			*off += n;
8596 		}
8597 		free(t0);
8598 	}
8599 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8600 	if (n < 0)
8601 		return got_error_from_errno("fprintf");
8602 	*off += n;
8603 
8604 	return NULL;
8605 }
8606 
8607 static const struct got_error *
8608 format_help(struct tog_help_view_state *s)
8609 {
8610 	const struct got_error		*err = NULL;
8611 	off_t				 off = 0;
8612 	int				 i, max, n, show = s->all;
8613 	static const struct tog_key_map	 km[] = {
8614 #define KEYMAP_(info, type)	{ NULL, (info), type }
8615 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8616 		GENERATE_HELP
8617 #undef KEYMAP_
8618 #undef KEY_
8619 	};
8620 
8621 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8622 	if (err)
8623 		return err;
8624 
8625 	n = nitems(km);
8626 	err = max_key_str(&max, km, n);
8627 	if (err)
8628 		return err;
8629 
8630 	for (i = 0; i < n; ++i) {
8631 		if (km[i].keys == NULL) {
8632 			show = s->all;
8633 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8634 			    km[i].type == s->type || s->all)
8635 				show = 1;
8636 		}
8637 		if (show) {
8638 			err = format_help_line(&off, s->f, &km[i], max);
8639 			if (err)
8640 				return err;
8641 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8642 			if (err)
8643 				return err;
8644 		}
8645 	}
8646 	fputc('\n', s->f);
8647 	++off;
8648 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8649 	return err;
8650 }
8651 
8652 static const struct got_error *
8653 create_help(struct tog_help_view_state *s)
8654 {
8655 	FILE			*f;
8656 	const struct got_error	*err;
8657 
8658 	free(s->line_offsets);
8659 	s->line_offsets = NULL;
8660 	s->nlines = 0;
8661 
8662 	f = got_opentemp();
8663 	if (f == NULL)
8664 		return got_error_from_errno("got_opentemp");
8665 	s->f = f;
8666 
8667 	err = format_help(s);
8668 	if (err)
8669 		return err;
8670 
8671 	if (s->f && fflush(s->f) != 0)
8672 		return got_error_from_errno("fflush");
8673 
8674 	return NULL;
8675 }
8676 
8677 static const struct got_error *
8678 search_start_help_view(struct tog_view *view)
8679 {
8680 	view->state.help.matched_line = 0;
8681 	return NULL;
8682 }
8683 
8684 static void
8685 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8686     size_t *nlines, int **first, int **last, int **match, int **selected)
8687 {
8688 	struct tog_help_view_state *s = &view->state.help;
8689 
8690 	*f = s->f;
8691 	*nlines = s->nlines;
8692 	*line_offsets = s->line_offsets;
8693 	*match = &s->matched_line;
8694 	*first = &s->first_displayed_line;
8695 	*last = &s->last_displayed_line;
8696 	*selected = &s->selected_line;
8697 }
8698 
8699 static const struct got_error *
8700 show_help_view(struct tog_view *view)
8701 {
8702 	struct tog_help_view_state	*s = &view->state.help;
8703 	const struct got_error		*err;
8704 	regmatch_t			*regmatch = &view->regmatch;
8705 	wchar_t				*wline;
8706 	char				*line;
8707 	ssize_t				 linelen;
8708 	size_t				 linesz = 0;
8709 	int				 width, nprinted = 0, rc = 0;
8710 	int				 eos = view->nlines;
8711 
8712 	if (view_is_hsplit_top(view))
8713 		--eos;  /* account for border */
8714 
8715 	s->lineno = 0;
8716 	rewind(s->f);
8717 	werase(view->window);
8718 
8719 	if (view->gline > s->nlines - 1)
8720 		view->gline = s->nlines - 1;
8721 
8722 	err = win_draw_center(view->window, 0, 0, view->ncols,
8723 	    view_needs_focus_indication(view),
8724 	    "tog help (press q to return to tog)");
8725 	if (err)
8726 		return err;
8727 	if (eos <= 1)
8728 		return NULL;
8729 	waddstr(view->window, "\n\n");
8730 	eos -= 2;
8731 
8732 	s->eof = 0;
8733 	view->maxx = 0;
8734 	line = NULL;
8735 	while (eos > 0 && nprinted < eos) {
8736 		attr_t attr = 0;
8737 
8738 		linelen = getline(&line, &linesz, s->f);
8739 		if (linelen == -1) {
8740 			if (!feof(s->f)) {
8741 				free(line);
8742 				return got_ferror(s->f, GOT_ERR_IO);
8743 			}
8744 			s->eof = 1;
8745 			break;
8746 		}
8747 		if (++s->lineno < s->first_displayed_line)
8748 			continue;
8749 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8750 			continue;
8751 		if (s->lineno == view->hiline)
8752 			attr = A_STANDOUT;
8753 
8754 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8755 		    view->x ? 1 : 0);
8756 		if (err) {
8757 			free(line);
8758 			return err;
8759 		}
8760 		view->maxx = MAX(view->maxx, width);
8761 		free(wline);
8762 		wline = NULL;
8763 
8764 		if (attr)
8765 			wattron(view->window, attr);
8766 		if (s->first_displayed_line + nprinted == s->matched_line &&
8767 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8768 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8769 			    view->window, view->x, regmatch);
8770 			if (err) {
8771 				free(line);
8772 				return err;
8773 			}
8774 		} else {
8775 			int skip;
8776 
8777 			err = format_line(&wline, &width, &skip, line,
8778 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8779 			if (err) {
8780 				free(line);
8781 				return err;
8782 			}
8783 			rc = waddwstr(view->window, &wline[skip]);
8784 			free(wline);
8785 			wline = NULL;
8786 			if (rc == ERR)
8787 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8788 		}
8789 		if (s->lineno == view->hiline) {
8790 			while (width++ < view->ncols)
8791 				waddch(view->window, ' ');
8792 		} else {
8793 			if (width <= view->ncols)
8794 				waddch(view->window, '\n');
8795 		}
8796 		if (attr)
8797 			wattroff(view->window, attr);
8798 		if (++nprinted == 1)
8799 			s->first_displayed_line = s->lineno;
8800 	}
8801 	free(line);
8802 	if (nprinted > 0)
8803 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8804 	else
8805 		s->last_displayed_line = s->first_displayed_line;
8806 
8807 	view_border(view);
8808 
8809 	if (s->eof) {
8810 		rc = waddnstr(view->window,
8811 		    "See the tog(1) manual page for full documentation",
8812 		    view->ncols - 1);
8813 		if (rc == ERR)
8814 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8815 	} else {
8816 		wmove(view->window, view->nlines - 1, 0);
8817 		wclrtoeol(view->window);
8818 		wstandout(view->window);
8819 		rc = waddnstr(view->window, "scroll down for more...",
8820 		    view->ncols - 1);
8821 		if (rc == ERR)
8822 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8823 		if (getcurx(view->window) < view->ncols - 6) {
8824 			rc = wprintw(view->window, "[%.0f%%]",
8825 			    100.00 * s->last_displayed_line / s->nlines);
8826 			if (rc == ERR)
8827 				return got_error_msg(GOT_ERR_IO, "wprintw");
8828 		}
8829 		wstandend(view->window);
8830 	}
8831 
8832 	return NULL;
8833 }
8834 
8835 static const struct got_error *
8836 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8837 {
8838 	struct tog_help_view_state	*s = &view->state.help;
8839 	const struct got_error		*err = NULL;
8840 	char				*line = NULL;
8841 	ssize_t				 linelen;
8842 	size_t				 linesz = 0;
8843 	int				 eos, nscroll;
8844 
8845 	eos = nscroll = view->nlines;
8846 	if (view_is_hsplit_top(view))
8847 		--eos;  /* border */
8848 
8849 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8850 
8851 	switch (ch) {
8852 	case '0':
8853 		view->x = 0;
8854 		break;
8855 	case '$':
8856 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8857 		view->count = 0;
8858 		break;
8859 	case KEY_RIGHT:
8860 	case 'l':
8861 		if (view->x + view->ncols / 3 < view->maxx)
8862 			view->x += 2;
8863 		else
8864 			view->count = 0;
8865 		break;
8866 	case KEY_LEFT:
8867 	case 'h':
8868 		view->x -= MIN(view->x, 2);
8869 		if (view->x <= 0)
8870 			view->count = 0;
8871 		break;
8872 	case 'g':
8873 	case KEY_HOME:
8874 		s->first_displayed_line = 1;
8875 		view->count = 0;
8876 		break;
8877 	case 'G':
8878 	case KEY_END:
8879 		view->count = 0;
8880 		if (s->eof)
8881 			break;
8882 		s->first_displayed_line = (s->nlines - eos) + 3;
8883 		s->eof = 1;
8884 		break;
8885 	case 'k':
8886 	case KEY_UP:
8887 		if (s->first_displayed_line > 1)
8888 			--s->first_displayed_line;
8889 		else
8890 			view->count = 0;
8891 		break;
8892 	case CTRL('u'):
8893 	case 'u':
8894 		nscroll /= 2;
8895 		/* FALL THROUGH */
8896 	case KEY_PPAGE:
8897 	case CTRL('b'):
8898 	case 'b':
8899 		if (s->first_displayed_line == 1) {
8900 			view->count = 0;
8901 			break;
8902 		}
8903 		while (--nscroll > 0 && s->first_displayed_line > 1)
8904 			s->first_displayed_line--;
8905 		break;
8906 	case 'j':
8907 	case KEY_DOWN:
8908 	case CTRL('n'):
8909 		if (!s->eof)
8910 			++s->first_displayed_line;
8911 		else
8912 			view->count = 0;
8913 		break;
8914 	case CTRL('d'):
8915 	case 'd':
8916 		nscroll /= 2;
8917 		/* FALL THROUGH */
8918 	case KEY_NPAGE:
8919 	case CTRL('f'):
8920 	case 'f':
8921 	case ' ':
8922 		if (s->eof) {
8923 			view->count = 0;
8924 			break;
8925 		}
8926 		while (!s->eof && --nscroll > 0) {
8927 			linelen = getline(&line, &linesz, s->f);
8928 			s->first_displayed_line++;
8929 			if (linelen == -1) {
8930 				if (feof(s->f))
8931 					s->eof = 1;
8932 				else
8933 					err = got_ferror(s->f, GOT_ERR_IO);
8934 				break;
8935 			}
8936 		}
8937 		free(line);
8938 		break;
8939 	default:
8940 		view->count = 0;
8941 		break;
8942 	}
8943 
8944 	return err;
8945 }
8946 
8947 static const struct got_error *
8948 close_help_view(struct tog_view *view)
8949 {
8950 	struct tog_help_view_state *s = &view->state.help;
8951 
8952 	free(s->line_offsets);
8953 	s->line_offsets = NULL;
8954 	if (fclose(s->f) == EOF)
8955 		return got_error_from_errno("fclose");
8956 
8957 	return NULL;
8958 }
8959 
8960 static const struct got_error *
8961 reset_help_view(struct tog_view *view)
8962 {
8963 	struct tog_help_view_state *s = &view->state.help;
8964 
8965 
8966 	if (s->f && fclose(s->f) == EOF)
8967 		return got_error_from_errno("fclose");
8968 
8969 	wclear(view->window);
8970 	view->count = 0;
8971 	view->x = 0;
8972 	s->all = !s->all;
8973 	s->first_displayed_line = 1;
8974 	s->last_displayed_line = view->nlines;
8975 	s->matched_line = 0;
8976 
8977 	return create_help(s);
8978 }
8979 
8980 static const struct got_error *
8981 open_help_view(struct tog_view *view, struct tog_view *parent)
8982 {
8983 	const struct got_error		*err = NULL;
8984 	struct tog_help_view_state	*s = &view->state.help;
8985 
8986 	s->type = (enum tog_keymap_type)parent->type;
8987 	s->first_displayed_line = 1;
8988 	s->last_displayed_line = view->nlines;
8989 	s->selected_line = 1;
8990 
8991 	view->show = show_help_view;
8992 	view->input = input_help_view;
8993 	view->reset = reset_help_view;
8994 	view->close = close_help_view;
8995 	view->search_start = search_start_help_view;
8996 	view->search_setup = search_setup_help_view;
8997 	view->search_next = search_next_view_match;
8998 
8999 	err = create_help(s);
9000 	return err;
9001 }
9002 
9003 static const struct got_error *
9004 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9005     enum tog_view_type request, int y, int x)
9006 {
9007 	const struct got_error *err = NULL;
9008 
9009 	*new_view = NULL;
9010 
9011 	switch (request) {
9012 	case TOG_VIEW_DIFF:
9013 		if (view->type == TOG_VIEW_LOG) {
9014 			struct tog_log_view_state *s = &view->state.log;
9015 
9016 			err = open_diff_view_for_commit(new_view, y, x,
9017 			    s->selected_entry->commit, s->selected_entry->id,
9018 			    view, s->repo);
9019 		} else
9020 			return got_error_msg(GOT_ERR_NOT_IMPL,
9021 			    "parent/child view pair not supported");
9022 		break;
9023 	case TOG_VIEW_BLAME:
9024 		if (view->type == TOG_VIEW_TREE) {
9025 			struct tog_tree_view_state *s = &view->state.tree;
9026 
9027 			err = blame_tree_entry(new_view, y, x,
9028 			    s->selected_entry, &s->parents, s->commit_id,
9029 			    s->repo);
9030 		} else
9031 			return got_error_msg(GOT_ERR_NOT_IMPL,
9032 			    "parent/child view pair not supported");
9033 		break;
9034 	case TOG_VIEW_LOG:
9035 		if (view->type == TOG_VIEW_BLAME)
9036 			err = log_annotated_line(new_view, y, x,
9037 			    view->state.blame.repo, view->state.blame.id_to_log);
9038 		else if (view->type == TOG_VIEW_TREE)
9039 			err = log_selected_tree_entry(new_view, y, x,
9040 			    &view->state.tree);
9041 		else if (view->type == TOG_VIEW_REF)
9042 			err = log_ref_entry(new_view, y, x,
9043 			    view->state.ref.selected_entry,
9044 			    view->state.ref.repo);
9045 		else
9046 			return got_error_msg(GOT_ERR_NOT_IMPL,
9047 			    "parent/child view pair not supported");
9048 		break;
9049 	case TOG_VIEW_TREE:
9050 		if (view->type == TOG_VIEW_LOG)
9051 			err = browse_commit_tree(new_view, y, x,
9052 			    view->state.log.selected_entry,
9053 			    view->state.log.in_repo_path,
9054 			    view->state.log.head_ref_name,
9055 			    view->state.log.repo);
9056 		else if (view->type == TOG_VIEW_REF)
9057 			err = browse_ref_tree(new_view, y, x,
9058 			    view->state.ref.selected_entry,
9059 			    view->state.ref.repo);
9060 		else
9061 			return got_error_msg(GOT_ERR_NOT_IMPL,
9062 			    "parent/child view pair not supported");
9063 		break;
9064 	case TOG_VIEW_REF:
9065 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9066 		if (*new_view == NULL)
9067 			return got_error_from_errno("view_open");
9068 		if (view->type == TOG_VIEW_LOG)
9069 			err = open_ref_view(*new_view, view->state.log.repo);
9070 		else if (view->type == TOG_VIEW_TREE)
9071 			err = open_ref_view(*new_view, view->state.tree.repo);
9072 		else
9073 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9074 			    "parent/child view pair not supported");
9075 		if (err)
9076 			view_close(*new_view);
9077 		break;
9078 	case TOG_VIEW_HELP:
9079 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9080 		if (*new_view == NULL)
9081 			return got_error_from_errno("view_open");
9082 		err = open_help_view(*new_view, view);
9083 		if (err)
9084 			view_close(*new_view);
9085 		break;
9086 	default:
9087 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9088 	}
9089 
9090 	return err;
9091 }
9092 
9093 /*
9094  * If view was scrolled down to move the selected line into view when opening a
9095  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9096  */
9097 static void
9098 offset_selection_up(struct tog_view *view)
9099 {
9100 	switch (view->type) {
9101 	case TOG_VIEW_BLAME: {
9102 		struct tog_blame_view_state *s = &view->state.blame;
9103 		if (s->first_displayed_line == 1) {
9104 			s->selected_line = MAX(s->selected_line - view->offset,
9105 			    1);
9106 			break;
9107 		}
9108 		if (s->first_displayed_line > view->offset)
9109 			s->first_displayed_line -= view->offset;
9110 		else
9111 			s->first_displayed_line = 1;
9112 		s->selected_line += view->offset;
9113 		break;
9114 	}
9115 	case TOG_VIEW_LOG:
9116 		log_scroll_up(&view->state.log, view->offset);
9117 		view->state.log.selected += view->offset;
9118 		break;
9119 	case TOG_VIEW_REF:
9120 		ref_scroll_up(&view->state.ref, view->offset);
9121 		view->state.ref.selected += view->offset;
9122 		break;
9123 	case TOG_VIEW_TREE:
9124 		tree_scroll_up(&view->state.tree, view->offset);
9125 		view->state.tree.selected += view->offset;
9126 		break;
9127 	default:
9128 		break;
9129 	}
9130 
9131 	view->offset = 0;
9132 }
9133 
9134 /*
9135  * If the selected line is in the section of screen covered by the bottom split,
9136  * scroll down offset lines to move it into view and index its new position.
9137  */
9138 static const struct got_error *
9139 offset_selection_down(struct tog_view *view)
9140 {
9141 	const struct got_error	*err = NULL;
9142 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9143 	int			*selected = NULL;
9144 	int			 header, offset;
9145 
9146 	switch (view->type) {
9147 	case TOG_VIEW_BLAME: {
9148 		struct tog_blame_view_state *s = &view->state.blame;
9149 		header = 3;
9150 		scrolld = NULL;
9151 		if (s->selected_line > view->nlines - header) {
9152 			offset = abs(view->nlines - s->selected_line - header);
9153 			s->first_displayed_line += offset;
9154 			s->selected_line -= offset;
9155 			view->offset = offset;
9156 		}
9157 		break;
9158 	}
9159 	case TOG_VIEW_LOG: {
9160 		struct tog_log_view_state *s = &view->state.log;
9161 		scrolld = &log_scroll_down;
9162 		header = view_is_parent_view(view) ? 3 : 2;
9163 		selected = &s->selected;
9164 		break;
9165 	}
9166 	case TOG_VIEW_REF: {
9167 		struct tog_ref_view_state *s = &view->state.ref;
9168 		scrolld = &ref_scroll_down;
9169 		header = 3;
9170 		selected = &s->selected;
9171 		break;
9172 	}
9173 	case TOG_VIEW_TREE: {
9174 		struct tog_tree_view_state *s = &view->state.tree;
9175 		scrolld = &tree_scroll_down;
9176 		header = 5;
9177 		selected = &s->selected;
9178 		break;
9179 	}
9180 	default:
9181 		selected = NULL;
9182 		scrolld = NULL;
9183 		header = 0;
9184 		break;
9185 	}
9186 
9187 	if (selected && *selected > view->nlines - header) {
9188 		offset = abs(view->nlines - *selected - header);
9189 		view->offset = offset;
9190 		if (scrolld && offset) {
9191 			err = scrolld(view, offset);
9192 			*selected -= offset;
9193 		}
9194 	}
9195 
9196 	return err;
9197 }
9198 
9199 static void
9200 list_commands(FILE *fp)
9201 {
9202 	size_t i;
9203 
9204 	fprintf(fp, "commands:");
9205 	for (i = 0; i < nitems(tog_commands); i++) {
9206 		const struct tog_cmd *cmd = &tog_commands[i];
9207 		fprintf(fp, " %s", cmd->name);
9208 	}
9209 	fputc('\n', fp);
9210 }
9211 
9212 __dead static void
9213 usage(int hflag, int status)
9214 {
9215 	FILE *fp = (status == 0) ? stdout : stderr;
9216 
9217 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9218 	    getprogname());
9219 	if (hflag) {
9220 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9221 		list_commands(fp);
9222 	}
9223 	exit(status);
9224 }
9225 
9226 static char **
9227 make_argv(int argc, ...)
9228 {
9229 	va_list ap;
9230 	char **argv;
9231 	int i;
9232 
9233 	va_start(ap, argc);
9234 
9235 	argv = calloc(argc, sizeof(char *));
9236 	if (argv == NULL)
9237 		err(1, "calloc");
9238 	for (i = 0; i < argc; i++) {
9239 		argv[i] = strdup(va_arg(ap, char *));
9240 		if (argv[i] == NULL)
9241 			err(1, "strdup");
9242 	}
9243 
9244 	va_end(ap);
9245 	return argv;
9246 }
9247 
9248 /*
9249  * Try to convert 'tog path' into a 'tog log path' command.
9250  * The user could simply have mistyped the command rather than knowingly
9251  * provided a path. So check whether argv[0] can in fact be resolved
9252  * to a path in the HEAD commit and print a special error if not.
9253  * This hack is for mpi@ <3
9254  */
9255 static const struct got_error *
9256 tog_log_with_path(int argc, char *argv[])
9257 {
9258 	const struct got_error *error = NULL, *close_err;
9259 	const struct tog_cmd *cmd = NULL;
9260 	struct got_repository *repo = NULL;
9261 	struct got_worktree *worktree = NULL;
9262 	struct got_object_id *commit_id = NULL, *id = NULL;
9263 	struct got_commit_object *commit = NULL;
9264 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9265 	char *commit_id_str = NULL, **cmd_argv = NULL;
9266 	int *pack_fds = NULL;
9267 
9268 	cwd = getcwd(NULL, 0);
9269 	if (cwd == NULL)
9270 		return got_error_from_errno("getcwd");
9271 
9272 	error = got_repo_pack_fds_open(&pack_fds);
9273 	if (error != NULL)
9274 		goto done;
9275 
9276 	error = got_worktree_open(&worktree, cwd);
9277 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9278 		goto done;
9279 
9280 	if (worktree)
9281 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9282 	else
9283 		repo_path = strdup(cwd);
9284 	if (repo_path == NULL) {
9285 		error = got_error_from_errno("strdup");
9286 		goto done;
9287 	}
9288 
9289 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9290 	if (error != NULL)
9291 		goto done;
9292 
9293 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9294 	    repo, worktree);
9295 	if (error)
9296 		goto done;
9297 
9298 	error = tog_load_refs(repo, 0);
9299 	if (error)
9300 		goto done;
9301 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9302 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9303 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9304 	if (error)
9305 		goto done;
9306 
9307 	if (worktree) {
9308 		got_worktree_close(worktree);
9309 		worktree = NULL;
9310 	}
9311 
9312 	error = got_object_open_as_commit(&commit, repo, commit_id);
9313 	if (error)
9314 		goto done;
9315 
9316 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9317 	if (error) {
9318 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9319 			goto done;
9320 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9321 		    getprogname(), argv[0]);
9322 		usage(1, 1);
9323 		/* not reached */
9324 	}
9325 
9326 	error = got_object_id_str(&commit_id_str, commit_id);
9327 	if (error)
9328 		goto done;
9329 
9330 	cmd = &tog_commands[0]; /* log */
9331 	argc = 4;
9332 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9333 	error = cmd->cmd_main(argc, cmd_argv);
9334 done:
9335 	if (repo) {
9336 		close_err = got_repo_close(repo);
9337 		if (error == NULL)
9338 			error = close_err;
9339 	}
9340 	if (commit)
9341 		got_object_commit_close(commit);
9342 	if (worktree)
9343 		got_worktree_close(worktree);
9344 	if (pack_fds) {
9345 		const struct got_error *pack_err =
9346 		    got_repo_pack_fds_close(pack_fds);
9347 		if (error == NULL)
9348 			error = pack_err;
9349 	}
9350 	free(id);
9351 	free(commit_id_str);
9352 	free(commit_id);
9353 	free(cwd);
9354 	free(repo_path);
9355 	free(in_repo_path);
9356 	if (cmd_argv) {
9357 		int i;
9358 		for (i = 0; i < argc; i++)
9359 			free(cmd_argv[i]);
9360 		free(cmd_argv);
9361 	}
9362 	tog_free_refs();
9363 	return error;
9364 }
9365 
9366 int
9367 main(int argc, char *argv[])
9368 {
9369 	const struct got_error *error = NULL;
9370 	const struct tog_cmd *cmd = NULL;
9371 	int ch, hflag = 0, Vflag = 0;
9372 	char **cmd_argv = NULL;
9373 	static const struct option longopts[] = {
9374 	    { "version", no_argument, NULL, 'V' },
9375 	    { NULL, 0, NULL, 0}
9376 	};
9377 	char *diff_algo_str = NULL;
9378 
9379 	if (!isatty(STDIN_FILENO))
9380 		errx(1, "standard input is not a tty");
9381 
9382 	setlocale(LC_CTYPE, "");
9383 
9384 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9385 		switch (ch) {
9386 		case 'h':
9387 			hflag = 1;
9388 			break;
9389 		case 'V':
9390 			Vflag = 1;
9391 			break;
9392 		default:
9393 			usage(hflag, 1);
9394 			/* NOTREACHED */
9395 		}
9396 	}
9397 
9398 	argc -= optind;
9399 	argv += optind;
9400 	optind = 1;
9401 	optreset = 1;
9402 
9403 	if (Vflag) {
9404 		got_version_print_str();
9405 		return 0;
9406 	}
9407 
9408 #ifndef PROFILE
9409 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9410 	    NULL) == -1)
9411 		err(1, "pledge");
9412 #endif
9413 
9414 	if (argc == 0) {
9415 		if (hflag)
9416 			usage(hflag, 0);
9417 		/* Build an argument vector which runs a default command. */
9418 		cmd = &tog_commands[0];
9419 		argc = 1;
9420 		cmd_argv = make_argv(argc, cmd->name);
9421 	} else {
9422 		size_t i;
9423 
9424 		/* Did the user specify a command? */
9425 		for (i = 0; i < nitems(tog_commands); i++) {
9426 			if (strncmp(tog_commands[i].name, argv[0],
9427 			    strlen(argv[0])) == 0) {
9428 				cmd = &tog_commands[i];
9429 				break;
9430 			}
9431 		}
9432 	}
9433 
9434 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9435 	if (diff_algo_str) {
9436 		if (strcasecmp(diff_algo_str, "patience") == 0)
9437 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9438 		if (strcasecmp(diff_algo_str, "myers") == 0)
9439 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9440 	}
9441 
9442 	if (cmd == NULL) {
9443 		if (argc != 1)
9444 			usage(0, 1);
9445 		/* No command specified; try log with a path */
9446 		error = tog_log_with_path(argc, argv);
9447 	} else {
9448 		if (hflag)
9449 			cmd->cmd_usage();
9450 		else
9451 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9452 	}
9453 
9454 	endwin();
9455 	putchar('\n');
9456 	if (cmd_argv) {
9457 		int i;
9458 		for (i = 0; i < argc; i++)
9459 			free(cmd_argv[i]);
9460 		free(cmd_argv);
9461 	}
9462 
9463 	if (error && error->code != GOT_ERR_CANCELLED &&
9464 	    error->code != GOT_ERR_EOF &&
9465 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9466 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9467 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9468 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9469 	return 0;
9470 }