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