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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/stat.h>
21 #include <sys/ioctl.h>
22 
23 #include <ctype.h>
24 #include <errno.h>
25 #if defined(__FreeBSD__) || defined(__APPLE__)
26 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
27 #endif
28 #include <curses.h>
29 #include <panel.h>
30 #include <locale.h>
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <getopt.h>
36 #include <string.h>
37 #include <err.h>
38 #include <unistd.h>
39 #include <limits.h>
40 #include <wchar.h>
41 #include <time.h>
42 #include <pthread.h>
43 #include <libgen.h>
44 #include <regex.h>
45 #include <sched.h>
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 	TOG_VIEW_HELP
112 };
113 
114 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
115 enum tog_keymap_type {
116 	TOG_KEYMAP_KEYS = -2,
117 	TOG_KEYMAP_GLOBAL,
118 	TOG_KEYMAP_DIFF,
119 	TOG_KEYMAP_LOG,
120 	TOG_KEYMAP_BLAME,
121 	TOG_KEYMAP_TREE,
122 	TOG_KEYMAP_REF,
123 	TOG_KEYMAP_HELP
124 };
125 
126 enum tog_view_mode {
127 	TOG_VIEW_SPLIT_NONE,
128 	TOG_VIEW_SPLIT_VERT,
129 	TOG_VIEW_SPLIT_HRZN
130 };
131 
132 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
133 
134 #define TOG_EOF_STRING	"(END)"
135 
136 struct commit_queue_entry {
137 	TAILQ_ENTRY(commit_queue_entry) entry;
138 	struct got_object_id *id;
139 	struct got_commit_object *commit;
140 	int idx;
141 };
142 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
143 struct commit_queue {
144 	int ncommits;
145 	struct commit_queue_head head;
146 };
147 
148 struct tog_color {
149 	STAILQ_ENTRY(tog_color) entry;
150 	regex_t regex;
151 	short colorpair;
152 };
153 STAILQ_HEAD(tog_colors, tog_color);
154 
155 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
156 static struct got_reflist_object_id_map *tog_refs_idmap;
157 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
158 
159 static const struct got_error *
160 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
161     struct got_reference* re2)
162 {
163 	const char *name1 = got_ref_get_name(re1);
164 	const char *name2 = got_ref_get_name(re2);
165 	int isbackup1, isbackup2;
166 
167 	/* Sort backup refs towards the bottom of the list. */
168 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
169 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
170 	if (!isbackup1 && isbackup2) {
171 		*cmp = -1;
172 		return NULL;
173 	} else if (isbackup1 && !isbackup2) {
174 		*cmp = 1;
175 		return NULL;
176 	}
177 
178 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
179 	return NULL;
180 }
181 
182 static const struct got_error *
183 tog_load_refs(struct got_repository *repo, int sort_by_date)
184 {
185 	const struct got_error *err;
186 
187 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
188 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
189 	    repo);
190 	if (err)
191 		return err;
192 
193 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
194 	    repo);
195 }
196 
197 static void
198 tog_free_refs(void)
199 {
200 	if (tog_refs_idmap) {
201 		got_reflist_object_id_map_free(tog_refs_idmap);
202 		tog_refs_idmap = NULL;
203 	}
204 	got_ref_list_free(&tog_refs);
205 }
206 
207 static const struct got_error *
208 add_color(struct tog_colors *colors, const char *pattern,
209     int idx, short color)
210 {
211 	const struct got_error *err = NULL;
212 	struct tog_color *tc;
213 	int regerr = 0;
214 
215 	if (idx < 1 || idx > COLOR_PAIRS - 1)
216 		return NULL;
217 
218 	init_pair(idx, color, -1);
219 
220 	tc = calloc(1, sizeof(*tc));
221 	if (tc == NULL)
222 		return got_error_from_errno("calloc");
223 	regerr = regcomp(&tc->regex, pattern,
224 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
225 	if (regerr) {
226 		static char regerr_msg[512];
227 		static char err_msg[512];
228 		regerror(regerr, &tc->regex, regerr_msg,
229 		    sizeof(regerr_msg));
230 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
231 		    regerr_msg);
232 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
233 		free(tc);
234 		return err;
235 	}
236 	tc->colorpair = idx;
237 	STAILQ_INSERT_HEAD(colors, tc, entry);
238 	return NULL;
239 }
240 
241 static void
242 free_colors(struct tog_colors *colors)
243 {
244 	struct tog_color *tc;
245 
246 	while (!STAILQ_EMPTY(colors)) {
247 		tc = STAILQ_FIRST(colors);
248 		STAILQ_REMOVE_HEAD(colors, entry);
249 		regfree(&tc->regex);
250 		free(tc);
251 	}
252 }
253 
254 static struct tog_color *
255 get_color(struct tog_colors *colors, int colorpair)
256 {
257 	struct tog_color *tc = NULL;
258 
259 	STAILQ_FOREACH(tc, colors, entry) {
260 		if (tc->colorpair == colorpair)
261 			return tc;
262 	}
263 
264 	return NULL;
265 }
266 
267 static int
268 default_color_value(const char *envvar)
269 {
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
271 		return COLOR_MAGENTA;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
273 		return COLOR_CYAN;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
275 		return COLOR_YELLOW;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
277 		return COLOR_GREEN;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
279 		return COLOR_MAGENTA;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
283 		return COLOR_CYAN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
285 		return COLOR_GREEN;
286 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
291 		return COLOR_YELLOW;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
295 		return COLOR_MAGENTA;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
299 		return COLOR_CYAN;
300 
301 	return -1;
302 }
303 
304 static int
305 get_color_value(const char *envvar)
306 {
307 	const char *val = getenv(envvar);
308 
309 	if (val == NULL)
310 		return default_color_value(envvar);
311 
312 	if (strcasecmp(val, "black") == 0)
313 		return COLOR_BLACK;
314 	if (strcasecmp(val, "red") == 0)
315 		return COLOR_RED;
316 	if (strcasecmp(val, "green") == 0)
317 		return COLOR_GREEN;
318 	if (strcasecmp(val, "yellow") == 0)
319 		return COLOR_YELLOW;
320 	if (strcasecmp(val, "blue") == 0)
321 		return COLOR_BLUE;
322 	if (strcasecmp(val, "magenta") == 0)
323 		return COLOR_MAGENTA;
324 	if (strcasecmp(val, "cyan") == 0)
325 		return COLOR_CYAN;
326 	if (strcasecmp(val, "white") == 0)
327 		return COLOR_WHITE;
328 	if (strcasecmp(val, "default") == 0)
329 		return -1;
330 
331 	return default_color_value(envvar);
332 }
333 
334 struct tog_diff_view_state {
335 	struct got_object_id *id1, *id2;
336 	const char *label1, *label2;
337 	FILE *f, *f1, *f2;
338 	int fd1, fd2;
339 	int lineno;
340 	int first_displayed_line;
341 	int last_displayed_line;
342 	int eof;
343 	int diff_context;
344 	int ignore_whitespace;
345 	int force_text_diff;
346 	struct got_repository *repo;
347 	struct got_diff_line *lines;
348 	size_t nlines;
349 	int matched_line;
350 	int selected_line;
351 
352 	/* passed from log or blame view; may be NULL */
353 	struct tog_view *parent_view;
354 };
355 
356 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
357 static volatile sig_atomic_t tog_thread_error;
358 
359 struct tog_log_thread_args {
360 	pthread_cond_t need_commits;
361 	pthread_cond_t commit_loaded;
362 	int commits_needed;
363 	int load_all;
364 	struct got_commit_graph *graph;
365 	struct commit_queue *real_commits;
366 	const char *in_repo_path;
367 	struct got_object_id *start_id;
368 	struct got_repository *repo;
369 	int *pack_fds;
370 	int log_complete;
371 	sig_atomic_t *quit;
372 	struct commit_queue_entry **first_displayed_entry;
373 	struct commit_queue_entry **selected_entry;
374 	int *searching;
375 	int *search_next_done;
376 	regex_t *regex;
377 	int *limiting;
378 	int limit_match;
379 	regex_t *limit_regex;
380 	struct commit_queue *limit_commits;
381 };
382 
383 struct tog_log_view_state {
384 	struct commit_queue *commits;
385 	struct commit_queue_entry *first_displayed_entry;
386 	struct commit_queue_entry *last_displayed_entry;
387 	struct commit_queue_entry *selected_entry;
388 	struct commit_queue real_commits;
389 	int selected;
390 	char *in_repo_path;
391 	char *head_ref_name;
392 	int log_branches;
393 	struct got_repository *repo;
394 	struct got_object_id *start_id;
395 	sig_atomic_t quit;
396 	pthread_t thread;
397 	struct tog_log_thread_args thread_args;
398 	struct commit_queue_entry *matched_entry;
399 	struct commit_queue_entry *search_entry;
400 	struct tog_colors colors;
401 	int use_committer;
402 	int limit_view;
403 	regex_t limit_regex;
404 	struct commit_queue limit_commits;
405 };
406 
407 #define TOG_COLOR_DIFF_MINUS		1
408 #define TOG_COLOR_DIFF_PLUS		2
409 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
410 #define TOG_COLOR_DIFF_META		4
411 #define TOG_COLOR_TREE_SUBMODULE	5
412 #define TOG_COLOR_TREE_SYMLINK		6
413 #define TOG_COLOR_TREE_DIRECTORY	7
414 #define TOG_COLOR_TREE_EXECUTABLE	8
415 #define TOG_COLOR_COMMIT		9
416 #define TOG_COLOR_AUTHOR		10
417 #define TOG_COLOR_DATE			11
418 #define TOG_COLOR_REFS_HEADS		12
419 #define TOG_COLOR_REFS_TAGS		13
420 #define TOG_COLOR_REFS_REMOTES		14
421 #define TOG_COLOR_REFS_BACKUP		15
422 
423 struct tog_blame_cb_args {
424 	struct tog_blame_line *lines; /* one per line */
425 	int nlines;
426 
427 	struct tog_view *view;
428 	struct got_object_id *commit_id;
429 	int *quit;
430 };
431 
432 struct tog_blame_thread_args {
433 	const char *path;
434 	struct got_repository *repo;
435 	struct tog_blame_cb_args *cb_args;
436 	int *complete;
437 	got_cancel_cb cancel_cb;
438 	void *cancel_arg;
439 };
440 
441 struct tog_blame {
442 	FILE *f;
443 	off_t filesize;
444 	struct tog_blame_line *lines;
445 	int nlines;
446 	off_t *line_offsets;
447 	pthread_t thread;
448 	struct tog_blame_thread_args thread_args;
449 	struct tog_blame_cb_args cb_args;
450 	const char *path;
451 	int *pack_fds;
452 };
453 
454 struct tog_blame_view_state {
455 	int first_displayed_line;
456 	int last_displayed_line;
457 	int selected_line;
458 	int last_diffed_line;
459 	int blame_complete;
460 	int eof;
461 	int done;
462 	struct got_object_id_queue blamed_commits;
463 	struct got_object_qid *blamed_commit;
464 	char *path;
465 	struct got_repository *repo;
466 	struct got_object_id *commit_id;
467 	struct got_object_id *id_to_log;
468 	struct tog_blame blame;
469 	int matched_line;
470 	struct tog_colors colors;
471 };
472 
473 struct tog_parent_tree {
474 	TAILQ_ENTRY(tog_parent_tree) entry;
475 	struct got_tree_object *tree;
476 	struct got_tree_entry *first_displayed_entry;
477 	struct got_tree_entry *selected_entry;
478 	int selected;
479 };
480 
481 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
482 
483 struct tog_tree_view_state {
484 	char *tree_label;
485 	struct got_object_id *commit_id;/* commit which this tree belongs to */
486 	struct got_tree_object *root;	/* the commit's root tree entry */
487 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
488 	struct got_tree_entry *first_displayed_entry;
489 	struct got_tree_entry *last_displayed_entry;
490 	struct got_tree_entry *selected_entry;
491 	int ndisplayed, selected, show_ids;
492 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
493 	char *head_ref_name;
494 	struct got_repository *repo;
495 	struct got_tree_entry *matched_entry;
496 	struct tog_colors colors;
497 };
498 
499 struct tog_reflist_entry {
500 	TAILQ_ENTRY(tog_reflist_entry) entry;
501 	struct got_reference *ref;
502 	int idx;
503 };
504 
505 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
506 
507 struct tog_ref_view_state {
508 	struct tog_reflist_head refs;
509 	struct tog_reflist_entry *first_displayed_entry;
510 	struct tog_reflist_entry *last_displayed_entry;
511 	struct tog_reflist_entry *selected_entry;
512 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
513 	struct got_repository *repo;
514 	struct tog_reflist_entry *matched_entry;
515 	struct tog_colors colors;
516 };
517 
518 struct tog_help_view_state {
519 	FILE			*f;
520 	off_t			*line_offsets;
521 	size_t			 nlines;
522 	int			 lineno;
523 	int			 first_displayed_line;
524 	int			 last_displayed_line;
525 	int			 eof;
526 	int			 matched_line;
527 	int			 selected_line;
528 	int			 all;
529 	enum tog_keymap_type	 type;
530 };
531 
532 #define GENERATE_HELP \
533 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
534 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
535 	KEY_("k C-p Up", "Move cursor or page up one line"), \
536 	KEY_("j C-n Down", "Move cursor or page down one line"), \
537 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
538 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
539 	KEY_("C-u u", "Scroll the view up one half page"), \
540 	KEY_("C-d d", "Scroll the view down one half page"), \
541 	KEY_("g", "Go to line N (default: first line)"), \
542 	KEY_("Home =", "Go to the first line"), \
543 	KEY_("G", "Go to line N (default: last line)"), \
544 	KEY_("End *", "Go to the last line"), \
545 	KEY_("l Right", "Scroll the view right"), \
546 	KEY_("h Left", "Scroll the view left"), \
547 	KEY_("$", "Scroll view to the rightmost position"), \
548 	KEY_("0", "Scroll view to the leftmost position"), \
549 	KEY_("-", "Decrease size of the focussed split"), \
550 	KEY_("+", "Increase size of the focussed split"), \
551 	KEY_("Tab", "Switch focus between views"), \
552 	KEY_("F", "Toggle fullscreen mode"), \
553 	KEY_("/", "Open prompt to enter search term"), \
554 	KEY_("n", "Find next line/token matching the current search term"), \
555 	KEY_("N", "Find previous line/token matching the current search term"),\
556 	KEY_("q", "Quit the focussed view; Quit help screen"), \
557 	KEY_("Q", "Quit tog"), \
558 	\
559 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
560 	KEY_("< ,", "Move cursor up one commit"), \
561 	KEY_("> .", "Move cursor down one commit"), \
562 	KEY_("Enter", "Open diff view of the selected commit"), \
563 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
564 	KEY_("R", "Open ref view of all repository references"), \
565 	KEY_("T", "Display tree view of the repository from the selected" \
566 	    " commit"), \
567 	KEY_("@", "Toggle between displaying author and committer name"), \
568 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
569 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
570 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
571 	\
572 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
573 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
574 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
575 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
576 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
577 	    " data"), \
578 	KEY_("(", "Go to the previous file in the diff"), \
579 	KEY_(")", "Go to the next file in the diff"), \
580 	KEY_("{", "Go to the previous hunk in the diff"), \
581 	KEY_("}", "Go to the next hunk in the diff"), \
582 	KEY_("[", "Decrease the number of context lines"), \
583 	KEY_("]", "Increase the number of context lines"), \
584 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
585 	\
586 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
587 	KEY_("Enter", "Display diff view of the selected line's commit"), \
588 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
589 	KEY_("L", "Open log view for the currently selected annotated line"), \
590 	KEY_("C", "Reload view with the previously blamed commit"), \
591 	KEY_("c", "Reload view with the version of the file found in the" \
592 	    " selected line's commit"), \
593 	KEY_("p", "Reload view with the version of the file found in the" \
594 	    " selected line's parent commit"), \
595 	\
596 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
597 	KEY_("Enter", "Enter selected directory or open blame view of the" \
598 	    " selected file"), \
599 	KEY_("L", "Open log view for the selected entry"), \
600 	KEY_("R", "Open ref view of all repository references"), \
601 	KEY_("i", "Show object IDs for all tree entries"), \
602 	KEY_("Backspace", "Return to the parent directory"), \
603 	\
604 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
605 	KEY_("Enter", "Display log view of the selected reference"), \
606 	KEY_("T", "Display tree view of the selected reference"), \
607 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
608 	KEY_("m", "Toggle display of last modified date for each reference"), \
609 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
610 	KEY_("C-l", "Reload view with all repository references")
611 
612 struct tog_key_map {
613 	const char		*keys;
614 	const char		*info;
615 	enum tog_keymap_type	 type;
616 };
617 
618 /* curses io for tog regress */
619 struct tog_io {
620 	FILE	*cin;
621 	FILE	*cout;
622 	FILE	*f;
623 };
624 
625 #define TOG_SCREEN_DUMP		"SCREENDUMP"
626 #define TOG_SCREEN_DUMP_LEN	(sizeof(TOG_SCREEN_DUMP) - 1)
627 #define TOG_KEY_SCRDUMP		SHRT_MIN
628 
629 /*
630  * We implement two types of views: parent views and child views.
631  *
632  * The 'Tab' key switches focus between a parent view and its child view.
633  * Child views are shown side-by-side to their parent view, provided
634  * there is enough screen estate.
635  *
636  * When a new view is opened from within a parent view, this new view
637  * becomes a child view of the parent view, replacing any existing child.
638  *
639  * When a new view is opened from within a child view, this new view
640  * becomes a parent view which will obscure the views below until the
641  * user quits the new parent view by typing 'q'.
642  *
643  * This list of views contains parent views only.
644  * Child views are only pointed to by their parent view.
645  */
646 TAILQ_HEAD(tog_view_list_head, tog_view);
647 
648 struct tog_view {
649 	TAILQ_ENTRY(tog_view) entry;
650 	WINDOW *window;
651 	PANEL *panel;
652 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
653 	int resized_y, resized_x; /* begin_y/x based on user resizing */
654 	int maxx, x; /* max column and current start column */
655 	int lines, cols; /* copies of LINES and COLS */
656 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
657 	int gline, hiline; /* navigate to and highlight this nG line */
658 	int ch, count; /* current keymap and count prefix */
659 	int resized; /* set when in a resize event */
660 	int focussed; /* Only set on one parent or child view at a time. */
661 	int dying;
662 	struct tog_view *parent;
663 	struct tog_view *child;
664 
665 	/*
666 	 * This flag is initially set on parent views when a new child view
667 	 * is created. It gets toggled when the 'Tab' key switches focus
668 	 * between parent and child.
669 	 * The flag indicates whether focus should be passed on to our child
670 	 * view if this parent view gets picked for focus after another parent
671 	 * view was closed. This prevents child views from losing focus in such
672 	 * situations.
673 	 */
674 	int focus_child;
675 
676 	enum tog_view_mode mode;
677 	/* type-specific state */
678 	enum tog_view_type type;
679 	union {
680 		struct tog_diff_view_state diff;
681 		struct tog_log_view_state log;
682 		struct tog_blame_view_state blame;
683 		struct tog_tree_view_state tree;
684 		struct tog_ref_view_state ref;
685 		struct tog_help_view_state help;
686 	} state;
687 
688 	const struct got_error *(*show)(struct tog_view *);
689 	const struct got_error *(*input)(struct tog_view **,
690 	    struct tog_view *, int);
691 	const struct got_error *(*reset)(struct tog_view *);
692 	const struct got_error *(*resize)(struct tog_view *, int);
693 	const struct got_error *(*close)(struct tog_view *);
694 
695 	const struct got_error *(*search_start)(struct tog_view *);
696 	const struct got_error *(*search_next)(struct tog_view *);
697 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
698 	    int **, int **, int **, int **);
699 	int search_started;
700 	int searching;
701 #define TOG_SEARCH_FORWARD	1
702 #define TOG_SEARCH_BACKWARD	2
703 	int search_next_done;
704 #define TOG_SEARCH_HAVE_MORE	1
705 #define TOG_SEARCH_NO_MORE	2
706 #define TOG_SEARCH_HAVE_NONE	3
707 	regex_t regex;
708 	regmatch_t regmatch;
709 	const char *action;
710 };
711 
712 static const struct got_error *open_diff_view(struct tog_view *,
713     struct got_object_id *, struct got_object_id *,
714     const char *, const char *, int, int, int, struct tog_view *,
715     struct got_repository *);
716 static const struct got_error *show_diff_view(struct tog_view *);
717 static const struct got_error *input_diff_view(struct tog_view **,
718     struct tog_view *, int);
719 static const struct got_error *reset_diff_view(struct tog_view *);
720 static const struct got_error* close_diff_view(struct tog_view *);
721 static const struct got_error *search_start_diff_view(struct tog_view *);
722 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
723     size_t *, int **, int **, int **, int **);
724 static const struct got_error *search_next_view_match(struct tog_view *);
725 
726 static const struct got_error *open_log_view(struct tog_view *,
727     struct got_object_id *, struct got_repository *,
728     const char *, const char *, int);
729 static const struct got_error * show_log_view(struct tog_view *);
730 static const struct got_error *input_log_view(struct tog_view **,
731     struct tog_view *, int);
732 static const struct got_error *resize_log_view(struct tog_view *, int);
733 static const struct got_error *close_log_view(struct tog_view *);
734 static const struct got_error *search_start_log_view(struct tog_view *);
735 static const struct got_error *search_next_log_view(struct tog_view *);
736 
737 static const struct got_error *open_blame_view(struct tog_view *, char *,
738     struct got_object_id *, struct got_repository *);
739 static const struct got_error *show_blame_view(struct tog_view *);
740 static const struct got_error *input_blame_view(struct tog_view **,
741     struct tog_view *, int);
742 static const struct got_error *reset_blame_view(struct tog_view *);
743 static const struct got_error *close_blame_view(struct tog_view *);
744 static const struct got_error *search_start_blame_view(struct tog_view *);
745 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
746     size_t *, int **, int **, int **, int **);
747 
748 static const struct got_error *open_tree_view(struct tog_view *,
749     struct got_object_id *, const char *, struct got_repository *);
750 static const struct got_error *show_tree_view(struct tog_view *);
751 static const struct got_error *input_tree_view(struct tog_view **,
752     struct tog_view *, int);
753 static const struct got_error *close_tree_view(struct tog_view *);
754 static const struct got_error *search_start_tree_view(struct tog_view *);
755 static const struct got_error *search_next_tree_view(struct tog_view *);
756 
757 static const struct got_error *open_ref_view(struct tog_view *,
758     struct got_repository *);
759 static const struct got_error *show_ref_view(struct tog_view *);
760 static const struct got_error *input_ref_view(struct tog_view **,
761     struct tog_view *, int);
762 static const struct got_error *close_ref_view(struct tog_view *);
763 static const struct got_error *search_start_ref_view(struct tog_view *);
764 static const struct got_error *search_next_ref_view(struct tog_view *);
765 
766 static const struct got_error *open_help_view(struct tog_view *,
767     struct tog_view *);
768 static const struct got_error *show_help_view(struct tog_view *);
769 static const struct got_error *input_help_view(struct tog_view **,
770     struct tog_view *, int);
771 static const struct got_error *reset_help_view(struct tog_view *);
772 static const struct got_error* close_help_view(struct tog_view *);
773 static const struct got_error *search_start_help_view(struct tog_view *);
774 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
775     size_t *, int **, int **, int **, int **);
776 
777 static volatile sig_atomic_t tog_sigwinch_received;
778 static volatile sig_atomic_t tog_sigpipe_received;
779 static volatile sig_atomic_t tog_sigcont_received;
780 static volatile sig_atomic_t tog_sigint_received;
781 static volatile sig_atomic_t tog_sigterm_received;
782 
783 static void
784 tog_sigwinch(int signo)
785 {
786 	tog_sigwinch_received = 1;
787 }
788 
789 static void
790 tog_sigpipe(int signo)
791 {
792 	tog_sigpipe_received = 1;
793 }
794 
795 static void
796 tog_sigcont(int signo)
797 {
798 	tog_sigcont_received = 1;
799 }
800 
801 static void
802 tog_sigint(int signo)
803 {
804 	tog_sigint_received = 1;
805 }
806 
807 static void
808 tog_sigterm(int signo)
809 {
810 	tog_sigterm_received = 1;
811 }
812 
813 static int
814 tog_fatal_signal_received(void)
815 {
816 	return (tog_sigpipe_received ||
817 	    tog_sigint_received || tog_sigterm_received);
818 }
819 
820 static const struct got_error *
821 view_close(struct tog_view *view)
822 {
823 	const struct got_error *err = NULL, *child_err = NULL;
824 
825 	if (view->child) {
826 		child_err = view_close(view->child);
827 		view->child = NULL;
828 	}
829 	if (view->close)
830 		err = view->close(view);
831 	if (view->panel)
832 		del_panel(view->panel);
833 	if (view->window)
834 		delwin(view->window);
835 	free(view);
836 	return err ? err : child_err;
837 }
838 
839 static struct tog_view *
840 view_open(int nlines, int ncols, int begin_y, int begin_x,
841     enum tog_view_type type)
842 {
843 	struct tog_view *view = calloc(1, sizeof(*view));
844 
845 	if (view == NULL)
846 		return NULL;
847 
848 	view->type = type;
849 	view->lines = LINES;
850 	view->cols = COLS;
851 	view->nlines = nlines ? nlines : LINES - begin_y;
852 	view->ncols = ncols ? ncols : COLS - begin_x;
853 	view->begin_y = begin_y;
854 	view->begin_x = begin_x;
855 	view->window = newwin(nlines, ncols, begin_y, begin_x);
856 	if (view->window == NULL) {
857 		view_close(view);
858 		return NULL;
859 	}
860 	view->panel = new_panel(view->window);
861 	if (view->panel == NULL ||
862 	    set_panel_userptr(view->panel, view) != OK) {
863 		view_close(view);
864 		return NULL;
865 	}
866 
867 	keypad(view->window, TRUE);
868 	return view;
869 }
870 
871 static int
872 view_split_begin_x(int begin_x)
873 {
874 	if (begin_x > 0 || COLS < 120)
875 		return 0;
876 	return (COLS - MAX(COLS / 2, 80));
877 }
878 
879 /* XXX Stub till we decide what to do. */
880 static int
881 view_split_begin_y(int lines)
882 {
883 	return lines * HSPLIT_SCALE;
884 }
885 
886 static const struct got_error *view_resize(struct tog_view *);
887 
888 static const struct got_error *
889 view_splitscreen(struct tog_view *view)
890 {
891 	const struct got_error *err = NULL;
892 
893 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
894 		if (view->resized_y && view->resized_y < view->lines)
895 			view->begin_y = view->resized_y;
896 		else
897 			view->begin_y = view_split_begin_y(view->nlines);
898 		view->begin_x = 0;
899 	} else if (!view->resized) {
900 		if (view->resized_x && view->resized_x < view->cols - 1 &&
901 		    view->cols > 119)
902 			view->begin_x = view->resized_x;
903 		else
904 			view->begin_x = view_split_begin_x(0);
905 		view->begin_y = 0;
906 	}
907 	view->nlines = LINES - view->begin_y;
908 	view->ncols = COLS - view->begin_x;
909 	view->lines = LINES;
910 	view->cols = COLS;
911 	err = view_resize(view);
912 	if (err)
913 		return err;
914 
915 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
916 		view->parent->nlines = view->begin_y;
917 
918 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
919 		return got_error_from_errno("mvwin");
920 
921 	return NULL;
922 }
923 
924 static const struct got_error *
925 view_fullscreen(struct tog_view *view)
926 {
927 	const struct got_error *err = NULL;
928 
929 	view->begin_x = 0;
930 	view->begin_y = view->resized ? view->begin_y : 0;
931 	view->nlines = view->resized ? view->nlines : LINES;
932 	view->ncols = COLS;
933 	view->lines = LINES;
934 	view->cols = COLS;
935 	err = view_resize(view);
936 	if (err)
937 		return err;
938 
939 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
940 		return got_error_from_errno("mvwin");
941 
942 	return NULL;
943 }
944 
945 static int
946 view_is_parent_view(struct tog_view *view)
947 {
948 	return view->parent == NULL;
949 }
950 
951 static int
952 view_is_splitscreen(struct tog_view *view)
953 {
954 	return view->begin_x > 0 || view->begin_y > 0;
955 }
956 
957 static int
958 view_is_fullscreen(struct tog_view *view)
959 {
960 	return view->nlines == LINES && view->ncols == COLS;
961 }
962 
963 static int
964 view_is_hsplit_top(struct tog_view *view)
965 {
966 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
967 	    view_is_splitscreen(view->child);
968 }
969 
970 static void
971 view_border(struct tog_view *view)
972 {
973 	PANEL *panel;
974 	const struct tog_view *view_above;
975 
976 	if (view->parent)
977 		return view_border(view->parent);
978 
979 	panel = panel_above(view->panel);
980 	if (panel == NULL)
981 		return;
982 
983 	view_above = panel_userptr(panel);
984 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
985 		mvwhline(view->window, view_above->begin_y - 1,
986 		    view->begin_x, got_locale_is_utf8() ?
987 		    ACS_HLINE : '-', view->ncols);
988 	else
989 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
990 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
991 }
992 
993 static const struct got_error *view_init_hsplit(struct tog_view *, int);
994 static const struct got_error *request_log_commits(struct tog_view *);
995 static const struct got_error *offset_selection_down(struct tog_view *);
996 static void offset_selection_up(struct tog_view *);
997 static void view_get_split(struct tog_view *, int *, int *);
998 
999 static const struct got_error *
1000 view_resize(struct tog_view *view)
1001 {
1002 	const struct got_error	*err = NULL;
1003 	int			 dif, nlines, ncols;
1004 
1005 	dif = LINES - view->lines;  /* line difference */
1006 
1007 	if (view->lines > LINES)
1008 		nlines = view->nlines - (view->lines - LINES);
1009 	else
1010 		nlines = view->nlines + (LINES - view->lines);
1011 	if (view->cols > COLS)
1012 		ncols = view->ncols - (view->cols - COLS);
1013 	else
1014 		ncols = view->ncols + (COLS - view->cols);
1015 
1016 	if (view->child) {
1017 		int hs = view->child->begin_y;
1018 
1019 		if (!view_is_fullscreen(view))
1020 			view->child->begin_x = view_split_begin_x(view->begin_x);
1021 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1022 		    view->child->begin_x == 0) {
1023 			ncols = COLS;
1024 
1025 			view_fullscreen(view->child);
1026 			if (view->child->focussed)
1027 				show_panel(view->child->panel);
1028 			else
1029 				show_panel(view->panel);
1030 		} else {
1031 			ncols = view->child->begin_x;
1032 
1033 			view_splitscreen(view->child);
1034 			show_panel(view->child->panel);
1035 		}
1036 		/*
1037 		 * XXX This is ugly and needs to be moved into the above
1038 		 * logic but "works" for now and my attempts at moving it
1039 		 * break either 'tab' or 'F' key maps in horizontal splits.
1040 		 */
1041 		if (hs) {
1042 			err = view_splitscreen(view->child);
1043 			if (err)
1044 				return err;
1045 			if (dif < 0) { /* top split decreased */
1046 				err = offset_selection_down(view);
1047 				if (err)
1048 					return err;
1049 			}
1050 			view_border(view);
1051 			update_panels();
1052 			doupdate();
1053 			show_panel(view->child->panel);
1054 			nlines = view->nlines;
1055 		}
1056 	} else if (view->parent == NULL)
1057 		ncols = COLS;
1058 
1059 	if (view->resize && dif > 0) {
1060 		err = view->resize(view, dif);
1061 		if (err)
1062 			return err;
1063 	}
1064 
1065 	if (wresize(view->window, nlines, ncols) == ERR)
1066 		return got_error_from_errno("wresize");
1067 	if (replace_panel(view->panel, view->window) == ERR)
1068 		return got_error_from_errno("replace_panel");
1069 	wclear(view->window);
1070 
1071 	view->nlines = nlines;
1072 	view->ncols = ncols;
1073 	view->lines = LINES;
1074 	view->cols = COLS;
1075 
1076 	return NULL;
1077 }
1078 
1079 static const struct got_error *
1080 resize_log_view(struct tog_view *view, int increase)
1081 {
1082 	struct tog_log_view_state	*s = &view->state.log;
1083 	const struct got_error		*err = NULL;
1084 	int				 n = 0;
1085 
1086 	if (s->selected_entry)
1087 		n = s->selected_entry->idx + view->lines - s->selected;
1088 
1089 	/*
1090 	 * Request commits to account for the increased
1091 	 * height so we have enough to populate the view.
1092 	 */
1093 	if (s->commits->ncommits < n) {
1094 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1095 		err = request_log_commits(view);
1096 	}
1097 
1098 	return err;
1099 }
1100 
1101 static void
1102 view_adjust_offset(struct tog_view *view, int n)
1103 {
1104 	if (n == 0)
1105 		return;
1106 
1107 	if (view->parent && view->parent->offset) {
1108 		if (view->parent->offset + n >= 0)
1109 			view->parent->offset += n;
1110 		else
1111 			view->parent->offset = 0;
1112 	} else if (view->offset) {
1113 		if (view->offset - n >= 0)
1114 			view->offset -= n;
1115 		else
1116 			view->offset = 0;
1117 	}
1118 }
1119 
1120 static const struct got_error *
1121 view_resize_split(struct tog_view *view, int resize)
1122 {
1123 	const struct got_error	*err = NULL;
1124 	struct tog_view		*v = NULL;
1125 
1126 	if (view->parent)
1127 		v = view->parent;
1128 	else
1129 		v = view;
1130 
1131 	if (!v->child || !view_is_splitscreen(v->child))
1132 		return NULL;
1133 
1134 	v->resized = v->child->resized = resize;  /* lock for resize event */
1135 
1136 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1137 		if (v->child->resized_y)
1138 			v->child->begin_y = v->child->resized_y;
1139 		if (view->parent)
1140 			v->child->begin_y -= resize;
1141 		else
1142 			v->child->begin_y += resize;
1143 		if (v->child->begin_y < 3) {
1144 			view->count = 0;
1145 			v->child->begin_y = 3;
1146 		} else if (v->child->begin_y > LINES - 1) {
1147 			view->count = 0;
1148 			v->child->begin_y = LINES - 1;
1149 		}
1150 		v->ncols = COLS;
1151 		v->child->ncols = COLS;
1152 		view_adjust_offset(view, resize);
1153 		err = view_init_hsplit(v, v->child->begin_y);
1154 		if (err)
1155 			return err;
1156 		v->child->resized_y = v->child->begin_y;
1157 	} else {
1158 		if (v->child->resized_x)
1159 			v->child->begin_x = v->child->resized_x;
1160 		if (view->parent)
1161 			v->child->begin_x -= resize;
1162 		else
1163 			v->child->begin_x += resize;
1164 		if (v->child->begin_x < 11) {
1165 			view->count = 0;
1166 			v->child->begin_x = 11;
1167 		} else if (v->child->begin_x > COLS - 1) {
1168 			view->count = 0;
1169 			v->child->begin_x = COLS - 1;
1170 		}
1171 		v->child->resized_x = v->child->begin_x;
1172 	}
1173 
1174 	v->child->mode = v->mode;
1175 	v->child->nlines = v->lines - v->child->begin_y;
1176 	v->child->ncols = v->cols - v->child->begin_x;
1177 	v->focus_child = 1;
1178 
1179 	err = view_fullscreen(v);
1180 	if (err)
1181 		return err;
1182 	err = view_splitscreen(v->child);
1183 	if (err)
1184 		return err;
1185 
1186 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1187 		err = offset_selection_down(v->child);
1188 		if (err)
1189 			return err;
1190 	}
1191 
1192 	if (v->resize)
1193 		err = v->resize(v, 0);
1194 	else if (v->child->resize)
1195 		err = v->child->resize(v->child, 0);
1196 
1197 	v->resized = v->child->resized = 0;
1198 
1199 	return err;
1200 }
1201 
1202 static void
1203 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1204 {
1205 	struct tog_view *v = src->child ? src->child : src;
1206 
1207 	dst->resized_x = v->resized_x;
1208 	dst->resized_y = v->resized_y;
1209 }
1210 
1211 static const struct got_error *
1212 view_close_child(struct tog_view *view)
1213 {
1214 	const struct got_error *err = NULL;
1215 
1216 	if (view->child == NULL)
1217 		return NULL;
1218 
1219 	err = view_close(view->child);
1220 	view->child = NULL;
1221 	return err;
1222 }
1223 
1224 static const struct got_error *
1225 view_set_child(struct tog_view *view, struct tog_view *child)
1226 {
1227 	const struct got_error *err = NULL;
1228 
1229 	view->child = child;
1230 	child->parent = view;
1231 
1232 	err = view_resize(view);
1233 	if (err)
1234 		return err;
1235 
1236 	if (view->child->resized_x || view->child->resized_y)
1237 		err = view_resize_split(view, 0);
1238 
1239 	return err;
1240 }
1241 
1242 static const struct got_error *view_dispatch_request(struct tog_view **,
1243     struct tog_view *, enum tog_view_type, int, int);
1244 
1245 static const struct got_error *
1246 view_request_new(struct tog_view **requested, struct tog_view *view,
1247     enum tog_view_type request)
1248 {
1249 	struct tog_view		*new_view = NULL;
1250 	const struct got_error	*err;
1251 	int			 y = 0, x = 0;
1252 
1253 	*requested = NULL;
1254 
1255 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1256 		view_get_split(view, &y, &x);
1257 
1258 	err = view_dispatch_request(&new_view, view, request, y, x);
1259 	if (err)
1260 		return err;
1261 
1262 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1263 	    request != TOG_VIEW_HELP) {
1264 		err = view_init_hsplit(view, y);
1265 		if (err)
1266 			return err;
1267 	}
1268 
1269 	view->focussed = 0;
1270 	new_view->focussed = 1;
1271 	new_view->mode = view->mode;
1272 	new_view->nlines = request == TOG_VIEW_HELP ?
1273 	    view->lines : view->lines - y;
1274 
1275 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1276 		view_transfer_size(new_view, view);
1277 		err = view_close_child(view);
1278 		if (err)
1279 			return err;
1280 		err = view_set_child(view, new_view);
1281 		if (err)
1282 			return err;
1283 		view->focus_child = 1;
1284 	} else
1285 		*requested = new_view;
1286 
1287 	return NULL;
1288 }
1289 
1290 static void
1291 tog_resizeterm(void)
1292 {
1293 	int cols, lines;
1294 	struct winsize size;
1295 
1296 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1297 		cols = 80;     /* Default */
1298 		lines = 24;
1299 	} else {
1300 		cols = size.ws_col;
1301 		lines = size.ws_row;
1302 	}
1303 	resize_term(lines, cols);
1304 }
1305 
1306 static const struct got_error *
1307 view_search_start(struct tog_view *view, int fast_refresh)
1308 {
1309 	const struct got_error *err = NULL;
1310 	struct tog_view *v = view;
1311 	char pattern[1024];
1312 	int ret;
1313 
1314 	if (view->search_started) {
1315 		regfree(&view->regex);
1316 		view->searching = 0;
1317 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1318 	}
1319 	view->search_started = 0;
1320 
1321 	if (view->nlines < 1)
1322 		return NULL;
1323 
1324 	if (view_is_hsplit_top(view))
1325 		v = view->child;
1326 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1327 		v = view->parent;
1328 
1329 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1330 	wclrtoeol(v->window);
1331 
1332 	nodelay(v->window, FALSE);  /* block for search term input */
1333 	nocbreak();
1334 	echo();
1335 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1336 	wrefresh(v->window);
1337 	cbreak();
1338 	noecho();
1339 	nodelay(v->window, TRUE);
1340 	if (!fast_refresh)
1341 		halfdelay(10);
1342 	if (ret == ERR)
1343 		return NULL;
1344 
1345 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1346 		err = view->search_start(view);
1347 		if (err) {
1348 			regfree(&view->regex);
1349 			return err;
1350 		}
1351 		view->search_started = 1;
1352 		view->searching = TOG_SEARCH_FORWARD;
1353 		view->search_next_done = 0;
1354 		view->search_next(view);
1355 	}
1356 
1357 	return NULL;
1358 }
1359 
1360 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1361 static const struct got_error *
1362 switch_split(struct tog_view *view)
1363 {
1364 	const struct got_error	*err = NULL;
1365 	struct tog_view		*v = NULL;
1366 
1367 	if (view->parent)
1368 		v = view->parent;
1369 	else
1370 		v = view;
1371 
1372 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1373 		v->mode = TOG_VIEW_SPLIT_VERT;
1374 	else
1375 		v->mode = TOG_VIEW_SPLIT_HRZN;
1376 
1377 	if (!v->child)
1378 		return NULL;
1379 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1380 		v->mode = TOG_VIEW_SPLIT_NONE;
1381 
1382 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1383 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1384 		v->child->begin_y = v->child->resized_y;
1385 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1386 		v->child->begin_x = v->child->resized_x;
1387 
1388 
1389 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1390 		v->ncols = COLS;
1391 		v->child->ncols = COLS;
1392 		v->child->nscrolled = LINES - v->child->nlines;
1393 
1394 		err = view_init_hsplit(v, v->child->begin_y);
1395 		if (err)
1396 			return err;
1397 	}
1398 	v->child->mode = v->mode;
1399 	v->child->nlines = v->lines - v->child->begin_y;
1400 	v->focus_child = 1;
1401 
1402 	err = view_fullscreen(v);
1403 	if (err)
1404 		return err;
1405 	err = view_splitscreen(v->child);
1406 	if (err)
1407 		return err;
1408 
1409 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1410 		v->mode = TOG_VIEW_SPLIT_VERT;
1411 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1412 		err = offset_selection_down(v);
1413 		if (err)
1414 			return err;
1415 		err = offset_selection_down(v->child);
1416 		if (err)
1417 			return err;
1418 	} else {
1419 		offset_selection_up(v);
1420 		offset_selection_up(v->child);
1421 	}
1422 	if (v->resize)
1423 		err = v->resize(v, 0);
1424 	else if (v->child->resize)
1425 		err = v->child->resize(v->child, 0);
1426 
1427 	return err;
1428 }
1429 
1430 /*
1431  * Strip trailing whitespace from str starting at byte *n;
1432  * if *n < 0, use strlen(str). Return new str length in *n.
1433  */
1434 static void
1435 strip_trailing_ws(char *str, int *n)
1436 {
1437 	size_t x = *n;
1438 
1439 	if (str == NULL || *str == '\0')
1440 		return;
1441 
1442 	if (x < 0)
1443 		x = strlen(str);
1444 
1445 	while (x-- > 0 && isspace((unsigned char)str[x]))
1446 		str[x] = '\0';
1447 
1448 	*n = x + 1;
1449 }
1450 
1451 /*
1452  * Extract visible substring of line y from the curses screen
1453  * and strip trailing whitespace. If vline is set and locale is
1454  * UTF-8, overwrite line[vline] with '|' because the ACS_VLINE
1455  * character is written out as 'x'. Write the line to file f.
1456  */
1457 static const struct got_error *
1458 view_write_line(FILE *f, int y, int vline)
1459 {
1460 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1461 	int	r, w;
1462 
1463 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1464 	if (r == ERR)
1465 		return got_error_fmt(GOT_ERR_RANGE,
1466 		    "failed to extract line %d", y);
1467 
1468 	/*
1469 	 * In some views, lines are padded with blanks to COLS width.
1470 	 * Strip them so we can diff without the -b flag when testing.
1471 	 */
1472 	strip_trailing_ws(line, &r);
1473 
1474 	if (vline > 0 && got_locale_is_utf8())
1475 		line[vline] = '|';
1476 
1477 	w = fprintf(f, "%s\n", line);
1478 	if (w != r + 1)		/* \n */
1479 		return got_ferror(f, GOT_ERR_IO);
1480 
1481 	return NULL;
1482 }
1483 
1484 /*
1485  * Capture the visible curses screen by writing each line to the
1486  * file at the path set via the TOG_SCR_DUMP environment variable.
1487  */
1488 static const struct got_error *
1489 screendump(struct tog_view *view)
1490 {
1491 	const struct got_error	*err;
1492 	FILE			*f = NULL;
1493 	const char		*path;
1494 	int			 i;
1495 
1496 	path = getenv("TOG_SCR_DUMP");
1497 	if (path == NULL || *path == '\0')
1498 		return got_error_msg(GOT_ERR_BAD_PATH,
1499 		    "TOG_SCR_DUMP path not set to capture screen dump");
1500 	f = fopen(path, "wex");
1501 	if (f == NULL)
1502 		return got_error_from_errno_fmt("fopen: %s", path);
1503 
1504 	if ((view->child && view->child->begin_x) ||
1505 	    (view->parent && view->begin_x)) {
1506 		int ncols = view->child ? view->ncols : view->parent->ncols;
1507 
1508 		/* vertical splitscreen */
1509 		for (i = 0; i < view->nlines; ++i) {
1510 			err = view_write_line(f, i, ncols - 1);
1511 			if (err)
1512 				goto done;
1513 		}
1514 	} else {
1515 		int hline = 0;
1516 
1517 		/* fullscreen or horizontal splitscreen */
1518 		if ((view->child && view->child->begin_y) ||
1519 		    (view->parent && view->begin_y))	/* hsplit */
1520 			hline = view->child ?
1521 			    view->child->begin_y : view->begin_y;
1522 
1523 		for (i = 0; i < view->lines; i++) {
1524 			if (hline && got_locale_is_utf8() && i == hline - 1) {
1525 				int c;
1526 
1527 				/* ACS_HLINE writes out as 'q', overwrite it */
1528 				for (c = 0; c < view->cols; ++c)
1529 					fputc('-', f);
1530 				fputc('\n', f);
1531 				continue;
1532 			}
1533 
1534 			err = view_write_line(f, i, 0);
1535 			if (err)
1536 				goto done;
1537 		}
1538 	}
1539 
1540 done:
1541 	if (f && fclose(f) == EOF && err == NULL)
1542 		err = got_ferror(f, GOT_ERR_IO);
1543 	return err;
1544 }
1545 
1546 /*
1547  * Compute view->count from numeric input. Assign total to view->count and
1548  * return first non-numeric key entered.
1549  */
1550 static int
1551 get_compound_key(struct tog_view *view, int c)
1552 {
1553 	struct tog_view	*v = view;
1554 	int		 x, n = 0;
1555 
1556 	if (view_is_hsplit_top(view))
1557 		v = view->child;
1558 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1559 		v = view->parent;
1560 
1561 	view->count = 0;
1562 	cbreak();  /* block for input */
1563 	nodelay(view->window, FALSE);
1564 	wmove(v->window, v->nlines - 1, 0);
1565 	wclrtoeol(v->window);
1566 	waddch(v->window, ':');
1567 
1568 	do {
1569 		x = getcurx(v->window);
1570 		if (x != ERR && x < view->ncols) {
1571 			waddch(v->window, c);
1572 			wrefresh(v->window);
1573 		}
1574 
1575 		/*
1576 		 * Don't overflow. Max valid request should be the greatest
1577 		 * between the longest and total lines; cap at 10 million.
1578 		 */
1579 		if (n >= 9999999)
1580 			n = 9999999;
1581 		else
1582 			n = n * 10 + (c - '0');
1583 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1584 
1585 	if (c == 'G' || c == 'g') {	/* nG key map */
1586 		view->gline = view->hiline = n;
1587 		n = 0;
1588 		c = 0;
1589 	}
1590 
1591 	/* Massage excessive or inapplicable values at the input handler. */
1592 	view->count = n;
1593 
1594 	return c;
1595 }
1596 
1597 static void
1598 action_report(struct tog_view *view)
1599 {
1600 	struct tog_view *v = view;
1601 
1602 	if (view_is_hsplit_top(view))
1603 		v = view->child;
1604 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1605 		v = view->parent;
1606 
1607 	wmove(v->window, v->nlines - 1, 0);
1608 	wclrtoeol(v->window);
1609 	wprintw(v->window, ":%s", view->action);
1610 	wrefresh(v->window);
1611 
1612 	/*
1613 	 * Clear action status report. Only clear in blame view
1614 	 * once annotating is complete, otherwise it's too fast.
1615 	 */
1616 	if (view->type == TOG_VIEW_BLAME) {
1617 		if (view->state.blame.blame_complete)
1618 			view->action = NULL;
1619 	} else
1620 		view->action = NULL;
1621 }
1622 
1623 /*
1624  * Read the next line from the test script and assign
1625  * key instruction to *ch. If at EOF, set the *done flag.
1626  */
1627 static const struct got_error *
1628 tog_read_script_key(FILE *script, int *ch, int *done)
1629 {
1630 	const struct got_error	*err = NULL;
1631 	char			*line = NULL;
1632 	size_t			 linesz = 0;
1633 
1634 	if (getline(&line, &linesz, script) == -1) {
1635 		if (feof(script)) {
1636 			*done = 1;
1637 			goto done;
1638 		} else {
1639 			err = got_ferror(script, GOT_ERR_IO);
1640 			goto done;
1641 		}
1642 	} else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1643 		*ch = KEY_ENTER;
1644 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1645 		*ch = KEY_RIGHT;
1646 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1647 		*ch = KEY_LEFT;
1648 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1649 		*ch = KEY_DOWN;
1650 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1651 		*ch = KEY_UP;
1652 	else if (strncasecmp(line, TOG_SCREEN_DUMP, TOG_SCREEN_DUMP_LEN) == 0)
1653 		*ch = TOG_KEY_SCRDUMP;
1654 	else
1655 		*ch = *line;
1656 
1657 done:
1658 	free(line);
1659 	return err;
1660 }
1661 
1662 static const struct got_error *
1663 view_input(struct tog_view **new, int *done, struct tog_view *view,
1664     struct tog_view_list_head *views, struct tog_io *tog_io, int fast_refresh)
1665 {
1666 	const struct got_error *err = NULL;
1667 	struct tog_view *v;
1668 	int ch, errcode;
1669 
1670 	*new = NULL;
1671 
1672 	if (view->action)
1673 		action_report(view);
1674 
1675 	/* Clear "no matches" indicator. */
1676 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1677 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1678 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1679 		view->count = 0;
1680 	}
1681 
1682 	if (view->searching && !view->search_next_done) {
1683 		errcode = pthread_mutex_unlock(&tog_mutex);
1684 		if (errcode)
1685 			return got_error_set_errno(errcode,
1686 			    "pthread_mutex_unlock");
1687 		sched_yield();
1688 		errcode = pthread_mutex_lock(&tog_mutex);
1689 		if (errcode)
1690 			return got_error_set_errno(errcode,
1691 			    "pthread_mutex_lock");
1692 		view->search_next(view);
1693 		return NULL;
1694 	}
1695 
1696 	/* Allow threads to make progress while we are waiting for input. */
1697 	errcode = pthread_mutex_unlock(&tog_mutex);
1698 	if (errcode)
1699 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1700 
1701 	if (tog_io && tog_io->f) {
1702 		err = tog_read_script_key(tog_io->f, &ch, done);
1703 		if (err)
1704 			return err;
1705 	} else if (view->count && --view->count) {
1706 		cbreak();
1707 		nodelay(view->window, TRUE);
1708 		ch = wgetch(view->window);
1709 		/* let C-g or backspace abort unfinished count */
1710 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1711 			view->count = 0;
1712 		else
1713 			ch = view->ch;
1714 	} else {
1715 		ch = wgetch(view->window);
1716 		if (ch >= '1' && ch  <= '9')
1717 			view->ch = ch = get_compound_key(view, ch);
1718 	}
1719 	if (view->hiline && ch != ERR && ch != 0)
1720 		view->hiline = 0;  /* key pressed, clear line highlight */
1721 	nodelay(view->window, TRUE);
1722 	errcode = pthread_mutex_lock(&tog_mutex);
1723 	if (errcode)
1724 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1725 
1726 	if (tog_sigwinch_received || tog_sigcont_received) {
1727 		tog_resizeterm();
1728 		tog_sigwinch_received = 0;
1729 		tog_sigcont_received = 0;
1730 		TAILQ_FOREACH(v, views, entry) {
1731 			err = view_resize(v);
1732 			if (err)
1733 				return err;
1734 			err = v->input(new, v, KEY_RESIZE);
1735 			if (err)
1736 				return err;
1737 			if (v->child) {
1738 				err = view_resize(v->child);
1739 				if (err)
1740 					return err;
1741 				err = v->child->input(new, v->child,
1742 				    KEY_RESIZE);
1743 				if (err)
1744 					return err;
1745 				if (v->child->resized_x || v->child->resized_y) {
1746 					err = view_resize_split(v, 0);
1747 					if (err)
1748 						return err;
1749 				}
1750 			}
1751 		}
1752 	}
1753 
1754 	switch (ch) {
1755 	case '?':
1756 	case 'H':
1757 	case KEY_F(1):
1758 		if (view->type == TOG_VIEW_HELP)
1759 			err = view->reset(view);
1760 		else
1761 			err = view_request_new(new, view, TOG_VIEW_HELP);
1762 		break;
1763 	case '\t':
1764 		view->count = 0;
1765 		if (view->child) {
1766 			view->focussed = 0;
1767 			view->child->focussed = 1;
1768 			view->focus_child = 1;
1769 		} else if (view->parent) {
1770 			view->focussed = 0;
1771 			view->parent->focussed = 1;
1772 			view->parent->focus_child = 0;
1773 			if (!view_is_splitscreen(view)) {
1774 				if (view->parent->resize) {
1775 					err = view->parent->resize(view->parent,
1776 					    0);
1777 					if (err)
1778 						return err;
1779 				}
1780 				offset_selection_up(view->parent);
1781 				err = view_fullscreen(view->parent);
1782 				if (err)
1783 					return err;
1784 			}
1785 		}
1786 		break;
1787 	case 'q':
1788 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1789 			if (view->parent->resize) {
1790 				/* might need more commits to fill fullscreen */
1791 				err = view->parent->resize(view->parent, 0);
1792 				if (err)
1793 					break;
1794 			}
1795 			offset_selection_up(view->parent);
1796 		}
1797 		err = view->input(new, view, ch);
1798 		view->dying = 1;
1799 		break;
1800 	case 'Q':
1801 		*done = 1;
1802 		break;
1803 	case 'F':
1804 		view->count = 0;
1805 		if (view_is_parent_view(view)) {
1806 			if (view->child == NULL)
1807 				break;
1808 			if (view_is_splitscreen(view->child)) {
1809 				view->focussed = 0;
1810 				view->child->focussed = 1;
1811 				err = view_fullscreen(view->child);
1812 			} else {
1813 				err = view_splitscreen(view->child);
1814 				if (!err)
1815 					err = view_resize_split(view, 0);
1816 			}
1817 			if (err)
1818 				break;
1819 			err = view->child->input(new, view->child,
1820 			    KEY_RESIZE);
1821 		} else {
1822 			if (view_is_splitscreen(view)) {
1823 				view->parent->focussed = 0;
1824 				view->focussed = 1;
1825 				err = view_fullscreen(view);
1826 			} else {
1827 				err = view_splitscreen(view);
1828 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1829 					err = view_resize(view->parent);
1830 				if (!err)
1831 					err = view_resize_split(view, 0);
1832 			}
1833 			if (err)
1834 				break;
1835 			err = view->input(new, view, KEY_RESIZE);
1836 		}
1837 		if (err)
1838 			break;
1839 		if (view->resize) {
1840 			err = view->resize(view, 0);
1841 			if (err)
1842 				break;
1843 		}
1844 		if (view->parent)
1845 			err = offset_selection_down(view->parent);
1846 		if (!err)
1847 			err = offset_selection_down(view);
1848 		break;
1849 	case 'S':
1850 		view->count = 0;
1851 		err = switch_split(view);
1852 		break;
1853 	case '-':
1854 		err = view_resize_split(view, -1);
1855 		break;
1856 	case '+':
1857 		err = view_resize_split(view, 1);
1858 		break;
1859 	case KEY_RESIZE:
1860 		break;
1861 	case '/':
1862 		view->count = 0;
1863 		if (view->search_start)
1864 			view_search_start(view, fast_refresh);
1865 		else
1866 			err = view->input(new, view, ch);
1867 		break;
1868 	case 'N':
1869 	case 'n':
1870 		if (view->search_started && view->search_next) {
1871 			view->searching = (ch == 'n' ?
1872 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1873 			view->search_next_done = 0;
1874 			view->search_next(view);
1875 		} else
1876 			err = view->input(new, view, ch);
1877 		break;
1878 	case 'A':
1879 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1880 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1881 			view->action = "Patience diff algorithm";
1882 		} else {
1883 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1884 			view->action = "Myers diff algorithm";
1885 		}
1886 		TAILQ_FOREACH(v, views, entry) {
1887 			if (v->reset) {
1888 				err = v->reset(v);
1889 				if (err)
1890 					return err;
1891 			}
1892 			if (v->child && v->child->reset) {
1893 				err = v->child->reset(v->child);
1894 				if (err)
1895 					return err;
1896 			}
1897 		}
1898 		break;
1899 	case TOG_KEY_SCRDUMP:
1900 		err = screendump(view);
1901 		break;
1902 	default:
1903 		err = view->input(new, view, ch);
1904 		break;
1905 	}
1906 
1907 	return err;
1908 }
1909 
1910 static int
1911 view_needs_focus_indication(struct tog_view *view)
1912 {
1913 	if (view_is_parent_view(view)) {
1914 		if (view->child == NULL || view->child->focussed)
1915 			return 0;
1916 		if (!view_is_splitscreen(view->child))
1917 			return 0;
1918 	} else if (!view_is_splitscreen(view))
1919 		return 0;
1920 
1921 	return view->focussed;
1922 }
1923 
1924 static const struct got_error *
1925 tog_io_close(struct tog_io *tog_io)
1926 {
1927 	const struct got_error *err = NULL;
1928 
1929 	if (tog_io->cin && fclose(tog_io->cin) == EOF)
1930 		err = got_ferror(tog_io->cin, GOT_ERR_IO);
1931 	if (tog_io->cout && fclose(tog_io->cout) == EOF && err == NULL)
1932 		err = got_ferror(tog_io->cout, GOT_ERR_IO);
1933 	if (tog_io->f && fclose(tog_io->f) == EOF && err == NULL)
1934 		err = got_ferror(tog_io->f, GOT_ERR_IO);
1935 	free(tog_io);
1936 	tog_io = NULL;
1937 
1938 	return err;
1939 }
1940 
1941 static const struct got_error *
1942 view_loop(struct tog_view *view, struct tog_io *tog_io)
1943 {
1944 	const struct got_error *err = NULL;
1945 	struct tog_view_list_head views;
1946 	struct tog_view *new_view;
1947 	char *mode;
1948 	int fast_refresh = 10;
1949 	int done = 0, errcode;
1950 
1951 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1952 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1953 		view->mode = TOG_VIEW_SPLIT_VERT;
1954 	else
1955 		view->mode = TOG_VIEW_SPLIT_HRZN;
1956 
1957 	errcode = pthread_mutex_lock(&tog_mutex);
1958 	if (errcode)
1959 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1960 
1961 	TAILQ_INIT(&views);
1962 	TAILQ_INSERT_HEAD(&views, view, entry);
1963 
1964 	view->focussed = 1;
1965 	err = view->show(view);
1966 	if (err)
1967 		return err;
1968 	update_panels();
1969 	doupdate();
1970 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1971 	    !tog_fatal_signal_received()) {
1972 		/* Refresh fast during initialization, then become slower. */
1973 		if (fast_refresh && --fast_refresh == 0)
1974 			halfdelay(10); /* switch to once per second */
1975 
1976 		err = view_input(&new_view, &done, view, &views, tog_io,
1977 		    fast_refresh);
1978 		if (err)
1979 			break;
1980 
1981 		if (view->dying && view == TAILQ_FIRST(&views) &&
1982 		    TAILQ_NEXT(view, entry) == NULL)
1983 			done = 1;
1984 		if (done) {
1985 			struct tog_view *v;
1986 
1987 			/*
1988 			 * When we quit, scroll the screen up a single line
1989 			 * so we don't lose any information.
1990 			 */
1991 			TAILQ_FOREACH(v, &views, entry) {
1992 				wmove(v->window, 0, 0);
1993 				wdeleteln(v->window);
1994 				wnoutrefresh(v->window);
1995 				if (v->child && !view_is_fullscreen(v)) {
1996 					wmove(v->child->window, 0, 0);
1997 					wdeleteln(v->child->window);
1998 					wnoutrefresh(v->child->window);
1999 				}
2000 			}
2001 			doupdate();
2002 		}
2003 
2004 		if (view->dying) {
2005 			struct tog_view *v, *prev = NULL;
2006 
2007 			if (view_is_parent_view(view))
2008 				prev = TAILQ_PREV(view, tog_view_list_head,
2009 				    entry);
2010 			else if (view->parent)
2011 				prev = view->parent;
2012 
2013 			if (view->parent) {
2014 				view->parent->child = NULL;
2015 				view->parent->focus_child = 0;
2016 				/* Restore fullscreen line height. */
2017 				view->parent->nlines = view->parent->lines;
2018 				err = view_resize(view->parent);
2019 				if (err)
2020 					break;
2021 				/* Make resized splits persist. */
2022 				view_transfer_size(view->parent, view);
2023 			} else
2024 				TAILQ_REMOVE(&views, view, entry);
2025 
2026 			err = view_close(view);
2027 			if (err)
2028 				goto done;
2029 
2030 			view = NULL;
2031 			TAILQ_FOREACH(v, &views, entry) {
2032 				if (v->focussed)
2033 					break;
2034 			}
2035 			if (view == NULL && new_view == NULL) {
2036 				/* No view has focus. Try to pick one. */
2037 				if (prev)
2038 					view = prev;
2039 				else if (!TAILQ_EMPTY(&views)) {
2040 					view = TAILQ_LAST(&views,
2041 					    tog_view_list_head);
2042 				}
2043 				if (view) {
2044 					if (view->focus_child) {
2045 						view->child->focussed = 1;
2046 						view = view->child;
2047 					} else
2048 						view->focussed = 1;
2049 				}
2050 			}
2051 		}
2052 		if (new_view) {
2053 			struct tog_view *v, *t;
2054 			/* Only allow one parent view per type. */
2055 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2056 				if (v->type != new_view->type)
2057 					continue;
2058 				TAILQ_REMOVE(&views, v, entry);
2059 				err = view_close(v);
2060 				if (err)
2061 					goto done;
2062 				break;
2063 			}
2064 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2065 			view = new_view;
2066 		}
2067 		if (view && !done) {
2068 			if (view_is_parent_view(view)) {
2069 				if (view->child && view->child->focussed)
2070 					view = view->child;
2071 			} else {
2072 				if (view->parent && view->parent->focussed)
2073 					view = view->parent;
2074 			}
2075 			show_panel(view->panel);
2076 			if (view->child && view_is_splitscreen(view->child))
2077 				show_panel(view->child->panel);
2078 			if (view->parent && view_is_splitscreen(view)) {
2079 				err = view->parent->show(view->parent);
2080 				if (err)
2081 					goto done;
2082 			}
2083 			err = view->show(view);
2084 			if (err)
2085 				goto done;
2086 			if (view->child) {
2087 				err = view->child->show(view->child);
2088 				if (err)
2089 					goto done;
2090 			}
2091 			update_panels();
2092 			doupdate();
2093 		}
2094 	}
2095 done:
2096 	while (!TAILQ_EMPTY(&views)) {
2097 		const struct got_error *close_err;
2098 		view = TAILQ_FIRST(&views);
2099 		TAILQ_REMOVE(&views, view, entry);
2100 		close_err = view_close(view);
2101 		if (close_err && err == NULL)
2102 			err = close_err;
2103 	}
2104 
2105 	errcode = pthread_mutex_unlock(&tog_mutex);
2106 	if (errcode && err == NULL)
2107 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2108 
2109 	return err;
2110 }
2111 
2112 __dead static void
2113 usage_log(void)
2114 {
2115 	endwin();
2116 	fprintf(stderr,
2117 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2118 	    getprogname());
2119 	exit(1);
2120 }
2121 
2122 /* Create newly allocated wide-character string equivalent to a byte string. */
2123 static const struct got_error *
2124 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2125 {
2126 	char *vis = NULL;
2127 	const struct got_error *err = NULL;
2128 
2129 	*ws = NULL;
2130 	*wlen = mbstowcs(NULL, s, 0);
2131 	if (*wlen == (size_t)-1) {
2132 		int vislen;
2133 		if (errno != EILSEQ)
2134 			return got_error_from_errno("mbstowcs");
2135 
2136 		/* byte string invalid in current encoding; try to "fix" it */
2137 		err = got_mbsavis(&vis, &vislen, s);
2138 		if (err)
2139 			return err;
2140 		*wlen = mbstowcs(NULL, vis, 0);
2141 		if (*wlen == (size_t)-1) {
2142 			err = got_error_from_errno("mbstowcs"); /* give up */
2143 			goto done;
2144 		}
2145 	}
2146 
2147 	*ws = calloc(*wlen + 1, sizeof(**ws));
2148 	if (*ws == NULL) {
2149 		err = got_error_from_errno("calloc");
2150 		goto done;
2151 	}
2152 
2153 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2154 		err = got_error_from_errno("mbstowcs");
2155 done:
2156 	free(vis);
2157 	if (err) {
2158 		free(*ws);
2159 		*ws = NULL;
2160 		*wlen = 0;
2161 	}
2162 	return err;
2163 }
2164 
2165 static const struct got_error *
2166 expand_tab(char **ptr, const char *src)
2167 {
2168 	char	*dst;
2169 	size_t	 len, n, idx = 0, sz = 0;
2170 
2171 	*ptr = NULL;
2172 	n = len = strlen(src);
2173 	dst = malloc(n + 1);
2174 	if (dst == NULL)
2175 		return got_error_from_errno("malloc");
2176 
2177 	while (idx < len && src[idx]) {
2178 		const char c = src[idx];
2179 
2180 		if (c == '\t') {
2181 			size_t nb = TABSIZE - sz % TABSIZE;
2182 			char *p;
2183 
2184 			p = realloc(dst, n + nb);
2185 			if (p == NULL) {
2186 				free(dst);
2187 				return got_error_from_errno("realloc");
2188 
2189 			}
2190 			dst = p;
2191 			n += nb;
2192 			memset(dst + sz, ' ', nb);
2193 			sz += nb;
2194 		} else
2195 			dst[sz++] = src[idx];
2196 		++idx;
2197 	}
2198 
2199 	dst[sz] = '\0';
2200 	*ptr = dst;
2201 	return NULL;
2202 }
2203 
2204 /*
2205  * Advance at most n columns from wline starting at offset off.
2206  * Return the index to the first character after the span operation.
2207  * Return the combined column width of all spanned wide character in
2208  * *rcol.
2209  */
2210 static int
2211 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2212 {
2213 	int width, i, cols = 0;
2214 
2215 	if (n == 0) {
2216 		*rcol = cols;
2217 		return off;
2218 	}
2219 
2220 	for (i = off; wline[i] != L'\0'; ++i) {
2221 		if (wline[i] == L'\t')
2222 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2223 		else
2224 			width = wcwidth(wline[i]);
2225 
2226 		if (width == -1) {
2227 			width = 1;
2228 			wline[i] = L'.';
2229 		}
2230 
2231 		if (cols + width > n)
2232 			break;
2233 		cols += width;
2234 	}
2235 
2236 	*rcol = cols;
2237 	return i;
2238 }
2239 
2240 /*
2241  * Format a line for display, ensuring that it won't overflow a width limit.
2242  * With scrolling, the width returned refers to the scrolled version of the
2243  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2244  */
2245 static const struct got_error *
2246 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2247     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2248 {
2249 	const struct got_error *err = NULL;
2250 	int cols;
2251 	wchar_t *wline = NULL;
2252 	char *exstr = NULL;
2253 	size_t wlen;
2254 	int i, scrollx;
2255 
2256 	*wlinep = NULL;
2257 	*widthp = 0;
2258 
2259 	if (expand) {
2260 		err = expand_tab(&exstr, line);
2261 		if (err)
2262 			return err;
2263 	}
2264 
2265 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2266 	free(exstr);
2267 	if (err)
2268 		return err;
2269 
2270 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2271 
2272 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2273 		wline[wlen - 1] = L'\0';
2274 		wlen--;
2275 	}
2276 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2277 		wline[wlen - 1] = L'\0';
2278 		wlen--;
2279 	}
2280 
2281 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2282 	wline[i] = L'\0';
2283 
2284 	if (widthp)
2285 		*widthp = cols;
2286 	if (scrollxp)
2287 		*scrollxp = scrollx;
2288 	if (err)
2289 		free(wline);
2290 	else
2291 		*wlinep = wline;
2292 	return err;
2293 }
2294 
2295 static const struct got_error*
2296 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2297     struct got_object_id *id, struct got_repository *repo)
2298 {
2299 	static const struct got_error *err = NULL;
2300 	struct got_reflist_entry *re;
2301 	char *s;
2302 	const char *name;
2303 
2304 	*refs_str = NULL;
2305 
2306 	TAILQ_FOREACH(re, refs, entry) {
2307 		struct got_tag_object *tag = NULL;
2308 		struct got_object_id *ref_id;
2309 		int cmp;
2310 
2311 		name = got_ref_get_name(re->ref);
2312 		if (strcmp(name, GOT_REF_HEAD) == 0)
2313 			continue;
2314 		if (strncmp(name, "refs/", 5) == 0)
2315 			name += 5;
2316 		if (strncmp(name, "got/", 4) == 0 &&
2317 		    strncmp(name, "got/backup/", 11) != 0)
2318 			continue;
2319 		if (strncmp(name, "heads/", 6) == 0)
2320 			name += 6;
2321 		if (strncmp(name, "remotes/", 8) == 0) {
2322 			name += 8;
2323 			s = strstr(name, "/" GOT_REF_HEAD);
2324 			if (s != NULL && s[strlen(s)] == '\0')
2325 				continue;
2326 		}
2327 		err = got_ref_resolve(&ref_id, repo, re->ref);
2328 		if (err)
2329 			break;
2330 		if (strncmp(name, "tags/", 5) == 0) {
2331 			err = got_object_open_as_tag(&tag, repo, ref_id);
2332 			if (err) {
2333 				if (err->code != GOT_ERR_OBJ_TYPE) {
2334 					free(ref_id);
2335 					break;
2336 				}
2337 				/* Ref points at something other than a tag. */
2338 				err = NULL;
2339 				tag = NULL;
2340 			}
2341 		}
2342 		cmp = got_object_id_cmp(tag ?
2343 		    got_object_tag_get_object_id(tag) : ref_id, id);
2344 		free(ref_id);
2345 		if (tag)
2346 			got_object_tag_close(tag);
2347 		if (cmp != 0)
2348 			continue;
2349 		s = *refs_str;
2350 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2351 		    s ? ", " : "", name) == -1) {
2352 			err = got_error_from_errno("asprintf");
2353 			free(s);
2354 			*refs_str = NULL;
2355 			break;
2356 		}
2357 		free(s);
2358 	}
2359 
2360 	return err;
2361 }
2362 
2363 static const struct got_error *
2364 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2365     int col_tab_align)
2366 {
2367 	char *smallerthan;
2368 
2369 	smallerthan = strchr(author, '<');
2370 	if (smallerthan && smallerthan[1] != '\0')
2371 		author = smallerthan + 1;
2372 	author[strcspn(author, "@>")] = '\0';
2373 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2374 	    col_tab_align, 0);
2375 }
2376 
2377 static const struct got_error *
2378 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2379     struct got_object_id *id, const size_t date_display_cols,
2380     int author_display_cols)
2381 {
2382 	struct tog_log_view_state *s = &view->state.log;
2383 	const struct got_error *err = NULL;
2384 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2385 	char *logmsg0 = NULL, *logmsg = NULL;
2386 	char *author = NULL;
2387 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2388 	int author_width, logmsg_width;
2389 	char *newline, *line = NULL;
2390 	int col, limit, scrollx;
2391 	const int avail = view->ncols;
2392 	struct tm tm;
2393 	time_t committer_time;
2394 	struct tog_color *tc;
2395 
2396 	committer_time = got_object_commit_get_committer_time(commit);
2397 	if (gmtime_r(&committer_time, &tm) == NULL)
2398 		return got_error_from_errno("gmtime_r");
2399 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2400 		return got_error(GOT_ERR_NO_SPACE);
2401 
2402 	if (avail <= date_display_cols)
2403 		limit = MIN(sizeof(datebuf) - 1, avail);
2404 	else
2405 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2406 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2407 	if (tc)
2408 		wattr_on(view->window,
2409 		    COLOR_PAIR(tc->colorpair), NULL);
2410 	waddnstr(view->window, datebuf, limit);
2411 	if (tc)
2412 		wattr_off(view->window,
2413 		    COLOR_PAIR(tc->colorpair), NULL);
2414 	col = limit;
2415 	if (col > avail)
2416 		goto done;
2417 
2418 	if (avail >= 120) {
2419 		char *id_str;
2420 		err = got_object_id_str(&id_str, id);
2421 		if (err)
2422 			goto done;
2423 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2424 		if (tc)
2425 			wattr_on(view->window,
2426 			    COLOR_PAIR(tc->colorpair), NULL);
2427 		wprintw(view->window, "%.8s ", id_str);
2428 		if (tc)
2429 			wattr_off(view->window,
2430 			    COLOR_PAIR(tc->colorpair), NULL);
2431 		free(id_str);
2432 		col += 9;
2433 		if (col > avail)
2434 			goto done;
2435 	}
2436 
2437 	if (s->use_committer)
2438 		author = strdup(got_object_commit_get_committer(commit));
2439 	else
2440 		author = strdup(got_object_commit_get_author(commit));
2441 	if (author == NULL) {
2442 		err = got_error_from_errno("strdup");
2443 		goto done;
2444 	}
2445 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2446 	if (err)
2447 		goto done;
2448 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2449 	if (tc)
2450 		wattr_on(view->window,
2451 		    COLOR_PAIR(tc->colorpair), NULL);
2452 	waddwstr(view->window, wauthor);
2453 	col += author_width;
2454 	while (col < avail && author_width < author_display_cols + 2) {
2455 		waddch(view->window, ' ');
2456 		col++;
2457 		author_width++;
2458 	}
2459 	if (tc)
2460 		wattr_off(view->window,
2461 		    COLOR_PAIR(tc->colorpair), NULL);
2462 	if (col > avail)
2463 		goto done;
2464 
2465 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2466 	if (err)
2467 		goto done;
2468 	logmsg = logmsg0;
2469 	while (*logmsg == '\n')
2470 		logmsg++;
2471 	newline = strchr(logmsg, '\n');
2472 	if (newline)
2473 		*newline = '\0';
2474 	limit = avail - col;
2475 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2476 		limit--;	/* for the border */
2477 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2478 	    limit, col, 1);
2479 	if (err)
2480 		goto done;
2481 	waddwstr(view->window, &wlogmsg[scrollx]);
2482 	col += MAX(logmsg_width, 0);
2483 	while (col < avail) {
2484 		waddch(view->window, ' ');
2485 		col++;
2486 	}
2487 done:
2488 	free(logmsg0);
2489 	free(wlogmsg);
2490 	free(author);
2491 	free(wauthor);
2492 	free(line);
2493 	return err;
2494 }
2495 
2496 static struct commit_queue_entry *
2497 alloc_commit_queue_entry(struct got_commit_object *commit,
2498     struct got_object_id *id)
2499 {
2500 	struct commit_queue_entry *entry;
2501 	struct got_object_id *dup;
2502 
2503 	entry = calloc(1, sizeof(*entry));
2504 	if (entry == NULL)
2505 		return NULL;
2506 
2507 	dup = got_object_id_dup(id);
2508 	if (dup == NULL) {
2509 		free(entry);
2510 		return NULL;
2511 	}
2512 
2513 	entry->id = dup;
2514 	entry->commit = commit;
2515 	return entry;
2516 }
2517 
2518 static void
2519 pop_commit(struct commit_queue *commits)
2520 {
2521 	struct commit_queue_entry *entry;
2522 
2523 	entry = TAILQ_FIRST(&commits->head);
2524 	TAILQ_REMOVE(&commits->head, entry, entry);
2525 	got_object_commit_close(entry->commit);
2526 	commits->ncommits--;
2527 	free(entry->id);
2528 	free(entry);
2529 }
2530 
2531 static void
2532 free_commits(struct commit_queue *commits)
2533 {
2534 	while (!TAILQ_EMPTY(&commits->head))
2535 		pop_commit(commits);
2536 }
2537 
2538 static const struct got_error *
2539 match_commit(int *have_match, struct got_object_id *id,
2540     struct got_commit_object *commit, regex_t *regex)
2541 {
2542 	const struct got_error *err = NULL;
2543 	regmatch_t regmatch;
2544 	char *id_str = NULL, *logmsg = NULL;
2545 
2546 	*have_match = 0;
2547 
2548 	err = got_object_id_str(&id_str, id);
2549 	if (err)
2550 		return err;
2551 
2552 	err = got_object_commit_get_logmsg(&logmsg, commit);
2553 	if (err)
2554 		goto done;
2555 
2556 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2557 	    &regmatch, 0) == 0 ||
2558 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2559 	    &regmatch, 0) == 0 ||
2560 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2561 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2562 		*have_match = 1;
2563 done:
2564 	free(id_str);
2565 	free(logmsg);
2566 	return err;
2567 }
2568 
2569 static const struct got_error *
2570 queue_commits(struct tog_log_thread_args *a)
2571 {
2572 	const struct got_error *err = NULL;
2573 
2574 	/*
2575 	 * We keep all commits open throughout the lifetime of the log
2576 	 * view in order to avoid having to re-fetch commits from disk
2577 	 * while updating the display.
2578 	 */
2579 	do {
2580 		struct got_object_id id;
2581 		struct got_commit_object *commit;
2582 		struct commit_queue_entry *entry;
2583 		int limit_match = 0;
2584 		int errcode;
2585 
2586 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2587 		    NULL, NULL);
2588 		if (err)
2589 			break;
2590 
2591 		err = got_object_open_as_commit(&commit, a->repo, &id);
2592 		if (err)
2593 			break;
2594 		entry = alloc_commit_queue_entry(commit, &id);
2595 		if (entry == NULL) {
2596 			err = got_error_from_errno("alloc_commit_queue_entry");
2597 			break;
2598 		}
2599 
2600 		errcode = pthread_mutex_lock(&tog_mutex);
2601 		if (errcode) {
2602 			err = got_error_set_errno(errcode,
2603 			    "pthread_mutex_lock");
2604 			break;
2605 		}
2606 
2607 		entry->idx = a->real_commits->ncommits;
2608 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2609 		a->real_commits->ncommits++;
2610 
2611 		if (*a->limiting) {
2612 			err = match_commit(&limit_match, &id, commit,
2613 			    a->limit_regex);
2614 			if (err)
2615 				break;
2616 
2617 			if (limit_match) {
2618 				struct commit_queue_entry *matched;
2619 
2620 				matched = alloc_commit_queue_entry(
2621 				    entry->commit, entry->id);
2622 				if (matched == NULL) {
2623 					err = got_error_from_errno(
2624 					    "alloc_commit_queue_entry");
2625 					break;
2626 				}
2627 				matched->commit = entry->commit;
2628 				got_object_commit_retain(entry->commit);
2629 
2630 				matched->idx = a->limit_commits->ncommits;
2631 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2632 				    matched, entry);
2633 				a->limit_commits->ncommits++;
2634 			}
2635 
2636 			/*
2637 			 * This is how we signal log_thread() that we
2638 			 * have found a match, and that it should be
2639 			 * counted as a new entry for the view.
2640 			 */
2641 			a->limit_match = limit_match;
2642 		}
2643 
2644 		if (*a->searching == TOG_SEARCH_FORWARD &&
2645 		    !*a->search_next_done) {
2646 			int have_match;
2647 			err = match_commit(&have_match, &id, commit, a->regex);
2648 			if (err)
2649 				break;
2650 
2651 			if (*a->limiting) {
2652 				if (limit_match && have_match)
2653 					*a->search_next_done =
2654 					    TOG_SEARCH_HAVE_MORE;
2655 			} else if (have_match)
2656 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2657 		}
2658 
2659 		errcode = pthread_mutex_unlock(&tog_mutex);
2660 		if (errcode && err == NULL)
2661 			err = got_error_set_errno(errcode,
2662 			    "pthread_mutex_unlock");
2663 		if (err)
2664 			break;
2665 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2666 
2667 	return err;
2668 }
2669 
2670 static void
2671 select_commit(struct tog_log_view_state *s)
2672 {
2673 	struct commit_queue_entry *entry;
2674 	int ncommits = 0;
2675 
2676 	entry = s->first_displayed_entry;
2677 	while (entry) {
2678 		if (ncommits == s->selected) {
2679 			s->selected_entry = entry;
2680 			break;
2681 		}
2682 		entry = TAILQ_NEXT(entry, entry);
2683 		ncommits++;
2684 	}
2685 }
2686 
2687 static const struct got_error *
2688 draw_commits(struct tog_view *view)
2689 {
2690 	const struct got_error *err = NULL;
2691 	struct tog_log_view_state *s = &view->state.log;
2692 	struct commit_queue_entry *entry = s->selected_entry;
2693 	int limit = view->nlines;
2694 	int width;
2695 	int ncommits, author_cols = 4;
2696 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2697 	char *refs_str = NULL;
2698 	wchar_t *wline;
2699 	struct tog_color *tc;
2700 	static const size_t date_display_cols = 12;
2701 
2702 	if (view_is_hsplit_top(view))
2703 		--limit;  /* account for border */
2704 
2705 	if (s->selected_entry &&
2706 	    !(view->searching && view->search_next_done == 0)) {
2707 		struct got_reflist_head *refs;
2708 		err = got_object_id_str(&id_str, s->selected_entry->id);
2709 		if (err)
2710 			return err;
2711 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2712 		    s->selected_entry->id);
2713 		if (refs) {
2714 			err = build_refs_str(&refs_str, refs,
2715 			    s->selected_entry->id, s->repo);
2716 			if (err)
2717 				goto done;
2718 		}
2719 	}
2720 
2721 	if (s->thread_args.commits_needed == 0)
2722 		halfdelay(10); /* disable fast refresh */
2723 
2724 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2725 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2726 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2727 		    (view->searching && !view->search_next_done) ?
2728 		    "searching..." : "loading...") == -1) {
2729 			err = got_error_from_errno("asprintf");
2730 			goto done;
2731 		}
2732 	} else {
2733 		const char *search_str = NULL;
2734 		const char *limit_str = NULL;
2735 
2736 		if (view->searching) {
2737 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2738 				search_str = "no more matches";
2739 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2740 				search_str = "no matches found";
2741 			else if (!view->search_next_done)
2742 				search_str = "searching...";
2743 		}
2744 
2745 		if (s->limit_view && s->commits->ncommits == 0)
2746 			limit_str = "no matches found";
2747 
2748 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2749 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2750 		    search_str ? search_str : (refs_str ? refs_str : ""),
2751 		    limit_str ? limit_str : "") == -1) {
2752 			err = got_error_from_errno("asprintf");
2753 			goto done;
2754 		}
2755 	}
2756 
2757 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2758 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2759 		    "........................................",
2760 		    s->in_repo_path, ncommits_str) == -1) {
2761 			err = got_error_from_errno("asprintf");
2762 			header = NULL;
2763 			goto done;
2764 		}
2765 	} else if (asprintf(&header, "commit %s%s",
2766 	    id_str ? id_str : "........................................",
2767 	    ncommits_str) == -1) {
2768 		err = got_error_from_errno("asprintf");
2769 		header = NULL;
2770 		goto done;
2771 	}
2772 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2773 	if (err)
2774 		goto done;
2775 
2776 	werase(view->window);
2777 
2778 	if (view_needs_focus_indication(view))
2779 		wstandout(view->window);
2780 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2781 	if (tc)
2782 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2783 	waddwstr(view->window, wline);
2784 	while (width < view->ncols) {
2785 		waddch(view->window, ' ');
2786 		width++;
2787 	}
2788 	if (tc)
2789 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2790 	if (view_needs_focus_indication(view))
2791 		wstandend(view->window);
2792 	free(wline);
2793 	if (limit <= 1)
2794 		goto done;
2795 
2796 	/* Grow author column size if necessary, and set view->maxx. */
2797 	entry = s->first_displayed_entry;
2798 	ncommits = 0;
2799 	view->maxx = 0;
2800 	while (entry) {
2801 		struct got_commit_object *c = entry->commit;
2802 		char *author, *eol, *msg, *msg0;
2803 		wchar_t *wauthor, *wmsg;
2804 		int width;
2805 		if (ncommits >= limit - 1)
2806 			break;
2807 		if (s->use_committer)
2808 			author = strdup(got_object_commit_get_committer(c));
2809 		else
2810 			author = strdup(got_object_commit_get_author(c));
2811 		if (author == NULL) {
2812 			err = got_error_from_errno("strdup");
2813 			goto done;
2814 		}
2815 		err = format_author(&wauthor, &width, author, COLS,
2816 		    date_display_cols);
2817 		if (author_cols < width)
2818 			author_cols = width;
2819 		free(wauthor);
2820 		free(author);
2821 		if (err)
2822 			goto done;
2823 		err = got_object_commit_get_logmsg(&msg0, c);
2824 		if (err)
2825 			goto done;
2826 		msg = msg0;
2827 		while (*msg == '\n')
2828 			++msg;
2829 		if ((eol = strchr(msg, '\n')))
2830 			*eol = '\0';
2831 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2832 		    date_display_cols + author_cols, 0);
2833 		if (err)
2834 			goto done;
2835 		view->maxx = MAX(view->maxx, width);
2836 		free(msg0);
2837 		free(wmsg);
2838 		ncommits++;
2839 		entry = TAILQ_NEXT(entry, entry);
2840 	}
2841 
2842 	entry = s->first_displayed_entry;
2843 	s->last_displayed_entry = s->first_displayed_entry;
2844 	ncommits = 0;
2845 	while (entry) {
2846 		if (ncommits >= limit - 1)
2847 			break;
2848 		if (ncommits == s->selected)
2849 			wstandout(view->window);
2850 		err = draw_commit(view, entry->commit, entry->id,
2851 		    date_display_cols, author_cols);
2852 		if (ncommits == s->selected)
2853 			wstandend(view->window);
2854 		if (err)
2855 			goto done;
2856 		ncommits++;
2857 		s->last_displayed_entry = entry;
2858 		entry = TAILQ_NEXT(entry, entry);
2859 	}
2860 
2861 	view_border(view);
2862 done:
2863 	free(id_str);
2864 	free(refs_str);
2865 	free(ncommits_str);
2866 	free(header);
2867 	return err;
2868 }
2869 
2870 static void
2871 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2872 {
2873 	struct commit_queue_entry *entry;
2874 	int nscrolled = 0;
2875 
2876 	entry = TAILQ_FIRST(&s->commits->head);
2877 	if (s->first_displayed_entry == entry)
2878 		return;
2879 
2880 	entry = s->first_displayed_entry;
2881 	while (entry && nscrolled < maxscroll) {
2882 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2883 		if (entry) {
2884 			s->first_displayed_entry = entry;
2885 			nscrolled++;
2886 		}
2887 	}
2888 }
2889 
2890 static const struct got_error *
2891 trigger_log_thread(struct tog_view *view, int wait)
2892 {
2893 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2894 	int errcode;
2895 
2896 	halfdelay(1); /* fast refresh while loading commits */
2897 
2898 	while (!ta->log_complete && !tog_thread_error &&
2899 	    (ta->commits_needed > 0 || ta->load_all)) {
2900 		/* Wake the log thread. */
2901 		errcode = pthread_cond_signal(&ta->need_commits);
2902 		if (errcode)
2903 			return got_error_set_errno(errcode,
2904 			    "pthread_cond_signal");
2905 
2906 		/*
2907 		 * The mutex will be released while the view loop waits
2908 		 * in wgetch(), at which time the log thread will run.
2909 		 */
2910 		if (!wait)
2911 			break;
2912 
2913 		/* Display progress update in log view. */
2914 		show_log_view(view);
2915 		update_panels();
2916 		doupdate();
2917 
2918 		/* Wait right here while next commit is being loaded. */
2919 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2920 		if (errcode)
2921 			return got_error_set_errno(errcode,
2922 			    "pthread_cond_wait");
2923 
2924 		/* Display progress update in log view. */
2925 		show_log_view(view);
2926 		update_panels();
2927 		doupdate();
2928 	}
2929 
2930 	return NULL;
2931 }
2932 
2933 static const struct got_error *
2934 request_log_commits(struct tog_view *view)
2935 {
2936 	struct tog_log_view_state	*state = &view->state.log;
2937 	const struct got_error		*err = NULL;
2938 
2939 	if (state->thread_args.log_complete)
2940 		return NULL;
2941 
2942 	state->thread_args.commits_needed += view->nscrolled;
2943 	err = trigger_log_thread(view, 1);
2944 	view->nscrolled = 0;
2945 
2946 	return err;
2947 }
2948 
2949 static const struct got_error *
2950 log_scroll_down(struct tog_view *view, int maxscroll)
2951 {
2952 	struct tog_log_view_state *s = &view->state.log;
2953 	const struct got_error *err = NULL;
2954 	struct commit_queue_entry *pentry;
2955 	int nscrolled = 0, ncommits_needed;
2956 
2957 	if (s->last_displayed_entry == NULL)
2958 		return NULL;
2959 
2960 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2961 	if (s->commits->ncommits < ncommits_needed &&
2962 	    !s->thread_args.log_complete) {
2963 		/*
2964 		 * Ask the log thread for required amount of commits.
2965 		 */
2966 		s->thread_args.commits_needed +=
2967 		    ncommits_needed - s->commits->ncommits;
2968 		err = trigger_log_thread(view, 1);
2969 		if (err)
2970 			return err;
2971 	}
2972 
2973 	do {
2974 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2975 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2976 			break;
2977 
2978 		s->last_displayed_entry = pentry ?
2979 		    pentry : s->last_displayed_entry;
2980 
2981 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2982 		if (pentry == NULL)
2983 			break;
2984 		s->first_displayed_entry = pentry;
2985 	} while (++nscrolled < maxscroll);
2986 
2987 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2988 		view->nscrolled += nscrolled;
2989 	else
2990 		view->nscrolled = 0;
2991 
2992 	return err;
2993 }
2994 
2995 static const struct got_error *
2996 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2997     struct got_commit_object *commit, struct got_object_id *commit_id,
2998     struct tog_view *log_view, struct got_repository *repo)
2999 {
3000 	const struct got_error *err;
3001 	struct got_object_qid *parent_id;
3002 	struct tog_view *diff_view;
3003 
3004 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3005 	if (diff_view == NULL)
3006 		return got_error_from_errno("view_open");
3007 
3008 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3009 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3010 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3011 	if (err == NULL)
3012 		*new_view = diff_view;
3013 	return err;
3014 }
3015 
3016 static const struct got_error *
3017 tree_view_visit_subtree(struct tog_tree_view_state *s,
3018     struct got_tree_object *subtree)
3019 {
3020 	struct tog_parent_tree *parent;
3021 
3022 	parent = calloc(1, sizeof(*parent));
3023 	if (parent == NULL)
3024 		return got_error_from_errno("calloc");
3025 
3026 	parent->tree = s->tree;
3027 	parent->first_displayed_entry = s->first_displayed_entry;
3028 	parent->selected_entry = s->selected_entry;
3029 	parent->selected = s->selected;
3030 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3031 	s->tree = subtree;
3032 	s->selected = 0;
3033 	s->first_displayed_entry = NULL;
3034 	return NULL;
3035 }
3036 
3037 static const struct got_error *
3038 tree_view_walk_path(struct tog_tree_view_state *s,
3039     struct got_commit_object *commit, const char *path)
3040 {
3041 	const struct got_error *err = NULL;
3042 	struct got_tree_object *tree = NULL;
3043 	const char *p;
3044 	char *slash, *subpath = NULL;
3045 
3046 	/* Walk the path and open corresponding tree objects. */
3047 	p = path;
3048 	while (*p) {
3049 		struct got_tree_entry *te;
3050 		struct got_object_id *tree_id;
3051 		char *te_name;
3052 
3053 		while (p[0] == '/')
3054 			p++;
3055 
3056 		/* Ensure the correct subtree entry is selected. */
3057 		slash = strchr(p, '/');
3058 		if (slash == NULL)
3059 			te_name = strdup(p);
3060 		else
3061 			te_name = strndup(p, slash - p);
3062 		if (te_name == NULL) {
3063 			err = got_error_from_errno("strndup");
3064 			break;
3065 		}
3066 		te = got_object_tree_find_entry(s->tree, te_name);
3067 		if (te == NULL) {
3068 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3069 			free(te_name);
3070 			break;
3071 		}
3072 		free(te_name);
3073 		s->first_displayed_entry = s->selected_entry = te;
3074 
3075 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3076 			break; /* jump to this file's entry */
3077 
3078 		slash = strchr(p, '/');
3079 		if (slash)
3080 			subpath = strndup(path, slash - path);
3081 		else
3082 			subpath = strdup(path);
3083 		if (subpath == NULL) {
3084 			err = got_error_from_errno("strdup");
3085 			break;
3086 		}
3087 
3088 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3089 		    subpath);
3090 		if (err)
3091 			break;
3092 
3093 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3094 		free(tree_id);
3095 		if (err)
3096 			break;
3097 
3098 		err = tree_view_visit_subtree(s, tree);
3099 		if (err) {
3100 			got_object_tree_close(tree);
3101 			break;
3102 		}
3103 		if (slash == NULL)
3104 			break;
3105 		free(subpath);
3106 		subpath = NULL;
3107 		p = slash;
3108 	}
3109 
3110 	free(subpath);
3111 	return err;
3112 }
3113 
3114 static const struct got_error *
3115 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3116     struct commit_queue_entry *entry, const char *path,
3117     const char *head_ref_name, struct got_repository *repo)
3118 {
3119 	const struct got_error *err = NULL;
3120 	struct tog_tree_view_state *s;
3121 	struct tog_view *tree_view;
3122 
3123 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3124 	if (tree_view == NULL)
3125 		return got_error_from_errno("view_open");
3126 
3127 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3128 	if (err)
3129 		return err;
3130 	s = &tree_view->state.tree;
3131 
3132 	*new_view = tree_view;
3133 
3134 	if (got_path_is_root_dir(path))
3135 		return NULL;
3136 
3137 	return tree_view_walk_path(s, entry->commit, path);
3138 }
3139 
3140 static const struct got_error *
3141 block_signals_used_by_main_thread(void)
3142 {
3143 	sigset_t sigset;
3144 	int errcode;
3145 
3146 	if (sigemptyset(&sigset) == -1)
3147 		return got_error_from_errno("sigemptyset");
3148 
3149 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3150 	if (sigaddset(&sigset, SIGWINCH) == -1)
3151 		return got_error_from_errno("sigaddset");
3152 	if (sigaddset(&sigset, SIGCONT) == -1)
3153 		return got_error_from_errno("sigaddset");
3154 	if (sigaddset(&sigset, SIGINT) == -1)
3155 		return got_error_from_errno("sigaddset");
3156 	if (sigaddset(&sigset, SIGTERM) == -1)
3157 		return got_error_from_errno("sigaddset");
3158 
3159 	/* ncurses handles SIGTSTP */
3160 	if (sigaddset(&sigset, SIGTSTP) == -1)
3161 		return got_error_from_errno("sigaddset");
3162 
3163 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3164 	if (errcode)
3165 		return got_error_set_errno(errcode, "pthread_sigmask");
3166 
3167 	return NULL;
3168 }
3169 
3170 static void *
3171 log_thread(void *arg)
3172 {
3173 	const struct got_error *err = NULL;
3174 	int errcode = 0;
3175 	struct tog_log_thread_args *a = arg;
3176 	int done = 0;
3177 
3178 	/*
3179 	 * Sync startup with main thread such that we begin our
3180 	 * work once view_input() has released the mutex.
3181 	 */
3182 	errcode = pthread_mutex_lock(&tog_mutex);
3183 	if (errcode) {
3184 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3185 		return (void *)err;
3186 	}
3187 
3188 	err = block_signals_used_by_main_thread();
3189 	if (err) {
3190 		pthread_mutex_unlock(&tog_mutex);
3191 		goto done;
3192 	}
3193 
3194 	while (!done && !err && !tog_fatal_signal_received()) {
3195 		errcode = pthread_mutex_unlock(&tog_mutex);
3196 		if (errcode) {
3197 			err = got_error_set_errno(errcode,
3198 			    "pthread_mutex_unlock");
3199 			goto done;
3200 		}
3201 		err = queue_commits(a);
3202 		if (err) {
3203 			if (err->code != GOT_ERR_ITER_COMPLETED)
3204 				goto done;
3205 			err = NULL;
3206 			done = 1;
3207 		} else if (a->commits_needed > 0 && !a->load_all) {
3208 			if (*a->limiting) {
3209 				if (a->limit_match)
3210 					a->commits_needed--;
3211 			} else
3212 				a->commits_needed--;
3213 		}
3214 
3215 		errcode = pthread_mutex_lock(&tog_mutex);
3216 		if (errcode) {
3217 			err = got_error_set_errno(errcode,
3218 			    "pthread_mutex_lock");
3219 			goto done;
3220 		} else if (*a->quit)
3221 			done = 1;
3222 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3223 			*a->first_displayed_entry =
3224 			    TAILQ_FIRST(&a->limit_commits->head);
3225 			*a->selected_entry = *a->first_displayed_entry;
3226 		} else if (*a->first_displayed_entry == NULL) {
3227 			*a->first_displayed_entry =
3228 			    TAILQ_FIRST(&a->real_commits->head);
3229 			*a->selected_entry = *a->first_displayed_entry;
3230 		}
3231 
3232 		errcode = pthread_cond_signal(&a->commit_loaded);
3233 		if (errcode) {
3234 			err = got_error_set_errno(errcode,
3235 			    "pthread_cond_signal");
3236 			pthread_mutex_unlock(&tog_mutex);
3237 			goto done;
3238 		}
3239 
3240 		if (done)
3241 			a->commits_needed = 0;
3242 		else {
3243 			if (a->commits_needed == 0 && !a->load_all) {
3244 				errcode = pthread_cond_wait(&a->need_commits,
3245 				    &tog_mutex);
3246 				if (errcode) {
3247 					err = got_error_set_errno(errcode,
3248 					    "pthread_cond_wait");
3249 					pthread_mutex_unlock(&tog_mutex);
3250 					goto done;
3251 				}
3252 				if (*a->quit)
3253 					done = 1;
3254 			}
3255 		}
3256 	}
3257 	a->log_complete = 1;
3258 	errcode = pthread_mutex_unlock(&tog_mutex);
3259 	if (errcode)
3260 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3261 done:
3262 	if (err) {
3263 		tog_thread_error = 1;
3264 		pthread_cond_signal(&a->commit_loaded);
3265 	}
3266 	return (void *)err;
3267 }
3268 
3269 static const struct got_error *
3270 stop_log_thread(struct tog_log_view_state *s)
3271 {
3272 	const struct got_error *err = NULL, *thread_err = NULL;
3273 	int errcode;
3274 
3275 	if (s->thread) {
3276 		s->quit = 1;
3277 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3278 		if (errcode)
3279 			return got_error_set_errno(errcode,
3280 			    "pthread_cond_signal");
3281 		errcode = pthread_mutex_unlock(&tog_mutex);
3282 		if (errcode)
3283 			return got_error_set_errno(errcode,
3284 			    "pthread_mutex_unlock");
3285 		errcode = pthread_join(s->thread, (void **)&thread_err);
3286 		if (errcode)
3287 			return got_error_set_errno(errcode, "pthread_join");
3288 		errcode = pthread_mutex_lock(&tog_mutex);
3289 		if (errcode)
3290 			return got_error_set_errno(errcode,
3291 			    "pthread_mutex_lock");
3292 		s->thread = 0; //NULL;
3293 	}
3294 
3295 	if (s->thread_args.repo) {
3296 		err = got_repo_close(s->thread_args.repo);
3297 		s->thread_args.repo = NULL;
3298 	}
3299 
3300 	if (s->thread_args.pack_fds) {
3301 		const struct got_error *pack_err =
3302 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3303 		if (err == NULL)
3304 			err = pack_err;
3305 		s->thread_args.pack_fds = NULL;
3306 	}
3307 
3308 	if (s->thread_args.graph) {
3309 		got_commit_graph_close(s->thread_args.graph);
3310 		s->thread_args.graph = NULL;
3311 	}
3312 
3313 	return err ? err : thread_err;
3314 }
3315 
3316 static const struct got_error *
3317 close_log_view(struct tog_view *view)
3318 {
3319 	const struct got_error *err = NULL;
3320 	struct tog_log_view_state *s = &view->state.log;
3321 	int errcode;
3322 
3323 	err = stop_log_thread(s);
3324 
3325 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3326 	if (errcode && err == NULL)
3327 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3328 
3329 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3330 	if (errcode && err == NULL)
3331 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3332 
3333 	free_commits(&s->limit_commits);
3334 	free_commits(&s->real_commits);
3335 	free(s->in_repo_path);
3336 	s->in_repo_path = NULL;
3337 	free(s->start_id);
3338 	s->start_id = NULL;
3339 	free(s->head_ref_name);
3340 	s->head_ref_name = NULL;
3341 	return err;
3342 }
3343 
3344 /*
3345  * We use two queues to implement the limit feature: first consists of
3346  * commits matching the current limit_regex; second is the real queue
3347  * of all known commits (real_commits). When the user starts limiting,
3348  * we swap queues such that all movement and displaying functionality
3349  * works with very slight change.
3350  */
3351 static const struct got_error *
3352 limit_log_view(struct tog_view *view)
3353 {
3354 	struct tog_log_view_state *s = &view->state.log;
3355 	struct commit_queue_entry *entry;
3356 	struct tog_view	*v = view;
3357 	const struct got_error *err = NULL;
3358 	char pattern[1024];
3359 	int ret;
3360 
3361 	if (view_is_hsplit_top(view))
3362 		v = view->child;
3363 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3364 		v = view->parent;
3365 
3366 	/* Get the pattern */
3367 	wmove(v->window, v->nlines - 1, 0);
3368 	wclrtoeol(v->window);
3369 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3370 	nodelay(v->window, FALSE);
3371 	nocbreak();
3372 	echo();
3373 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3374 	cbreak();
3375 	noecho();
3376 	nodelay(v->window, TRUE);
3377 	if (ret == ERR)
3378 		return NULL;
3379 
3380 	if (*pattern == '\0') {
3381 		/*
3382 		 * Safety measure for the situation where the user
3383 		 * resets limit without previously limiting anything.
3384 		 */
3385 		if (!s->limit_view)
3386 			return NULL;
3387 
3388 		/*
3389 		 * User could have pressed Ctrl+L, which refreshed the
3390 		 * commit queues, it means we can't save previously
3391 		 * (before limit took place) displayed entries,
3392 		 * because they would point to already free'ed memory,
3393 		 * so we are forced to always select first entry of
3394 		 * the queue.
3395 		 */
3396 		s->commits = &s->real_commits;
3397 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3398 		s->selected_entry = s->first_displayed_entry;
3399 		s->selected = 0;
3400 		s->limit_view = 0;
3401 
3402 		return NULL;
3403 	}
3404 
3405 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3406 		return NULL;
3407 
3408 	s->limit_view = 1;
3409 
3410 	/* Clear the screen while loading limit view */
3411 	s->first_displayed_entry = NULL;
3412 	s->last_displayed_entry = NULL;
3413 	s->selected_entry = NULL;
3414 	s->commits = &s->limit_commits;
3415 
3416 	/* Prepare limit queue for new search */
3417 	free_commits(&s->limit_commits);
3418 	s->limit_commits.ncommits = 0;
3419 
3420 	/* First process commits, which are in queue already */
3421 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3422 		int have_match = 0;
3423 
3424 		err = match_commit(&have_match, entry->id,
3425 		    entry->commit, &s->limit_regex);
3426 		if (err)
3427 			return err;
3428 
3429 		if (have_match) {
3430 			struct commit_queue_entry *matched;
3431 
3432 			matched = alloc_commit_queue_entry(entry->commit,
3433 			    entry->id);
3434 			if (matched == NULL) {
3435 				err = got_error_from_errno(
3436 				    "alloc_commit_queue_entry");
3437 				break;
3438 			}
3439 			matched->commit = entry->commit;
3440 			got_object_commit_retain(entry->commit);
3441 
3442 			matched->idx = s->limit_commits.ncommits;
3443 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3444 			    matched, entry);
3445 			s->limit_commits.ncommits++;
3446 		}
3447 	}
3448 
3449 	/* Second process all the commits, until we fill the screen */
3450 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3451 	    !s->thread_args.log_complete) {
3452 		s->thread_args.commits_needed +=
3453 		    view->nlines - s->limit_commits.ncommits - 1;
3454 		err = trigger_log_thread(view, 1);
3455 		if (err)
3456 			return err;
3457 	}
3458 
3459 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3460 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3461 	s->selected = 0;
3462 
3463 	return NULL;
3464 }
3465 
3466 static const struct got_error *
3467 search_start_log_view(struct tog_view *view)
3468 {
3469 	struct tog_log_view_state *s = &view->state.log;
3470 
3471 	s->matched_entry = NULL;
3472 	s->search_entry = NULL;
3473 	return NULL;
3474 }
3475 
3476 static const struct got_error *
3477 search_next_log_view(struct tog_view *view)
3478 {
3479 	const struct got_error *err = NULL;
3480 	struct tog_log_view_state *s = &view->state.log;
3481 	struct commit_queue_entry *entry;
3482 
3483 	/* Display progress update in log view. */
3484 	show_log_view(view);
3485 	update_panels();
3486 	doupdate();
3487 
3488 	if (s->search_entry) {
3489 		int errcode, ch;
3490 		errcode = pthread_mutex_unlock(&tog_mutex);
3491 		if (errcode)
3492 			return got_error_set_errno(errcode,
3493 			    "pthread_mutex_unlock");
3494 		ch = wgetch(view->window);
3495 		errcode = pthread_mutex_lock(&tog_mutex);
3496 		if (errcode)
3497 			return got_error_set_errno(errcode,
3498 			    "pthread_mutex_lock");
3499 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3500 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3501 			return NULL;
3502 		}
3503 		if (view->searching == TOG_SEARCH_FORWARD)
3504 			entry = TAILQ_NEXT(s->search_entry, entry);
3505 		else
3506 			entry = TAILQ_PREV(s->search_entry,
3507 			    commit_queue_head, entry);
3508 	} else if (s->matched_entry) {
3509 		/*
3510 		 * If the user has moved the cursor after we hit a match,
3511 		 * the position from where we should continue searching
3512 		 * might have changed.
3513 		 */
3514 		if (view->searching == TOG_SEARCH_FORWARD)
3515 			entry = TAILQ_NEXT(s->selected_entry, entry);
3516 		else
3517 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3518 			    entry);
3519 	} else {
3520 		entry = s->selected_entry;
3521 	}
3522 
3523 	while (1) {
3524 		int have_match = 0;
3525 
3526 		if (entry == NULL) {
3527 			if (s->thread_args.log_complete ||
3528 			    view->searching == TOG_SEARCH_BACKWARD) {
3529 				view->search_next_done =
3530 				    (s->matched_entry == NULL ?
3531 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3532 				s->search_entry = NULL;
3533 				return NULL;
3534 			}
3535 			/*
3536 			 * Poke the log thread for more commits and return,
3537 			 * allowing the main loop to make progress. Search
3538 			 * will resume at s->search_entry once we come back.
3539 			 */
3540 			s->thread_args.commits_needed++;
3541 			return trigger_log_thread(view, 0);
3542 		}
3543 
3544 		err = match_commit(&have_match, entry->id, entry->commit,
3545 		    &view->regex);
3546 		if (err)
3547 			break;
3548 		if (have_match) {
3549 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3550 			s->matched_entry = entry;
3551 			break;
3552 		}
3553 
3554 		s->search_entry = entry;
3555 		if (view->searching == TOG_SEARCH_FORWARD)
3556 			entry = TAILQ_NEXT(entry, entry);
3557 		else
3558 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3559 	}
3560 
3561 	if (s->matched_entry) {
3562 		int cur = s->selected_entry->idx;
3563 		while (cur < s->matched_entry->idx) {
3564 			err = input_log_view(NULL, view, KEY_DOWN);
3565 			if (err)
3566 				return err;
3567 			cur++;
3568 		}
3569 		while (cur > s->matched_entry->idx) {
3570 			err = input_log_view(NULL, view, KEY_UP);
3571 			if (err)
3572 				return err;
3573 			cur--;
3574 		}
3575 	}
3576 
3577 	s->search_entry = NULL;
3578 
3579 	return NULL;
3580 }
3581 
3582 static const struct got_error *
3583 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3584     struct got_repository *repo, const char *head_ref_name,
3585     const char *in_repo_path, int log_branches)
3586 {
3587 	const struct got_error *err = NULL;
3588 	struct tog_log_view_state *s = &view->state.log;
3589 	struct got_repository *thread_repo = NULL;
3590 	struct got_commit_graph *thread_graph = NULL;
3591 	int errcode;
3592 
3593 	if (in_repo_path != s->in_repo_path) {
3594 		free(s->in_repo_path);
3595 		s->in_repo_path = strdup(in_repo_path);
3596 		if (s->in_repo_path == NULL)
3597 			return got_error_from_errno("strdup");
3598 	}
3599 
3600 	/* The commit queue only contains commits being displayed. */
3601 	TAILQ_INIT(&s->real_commits.head);
3602 	s->real_commits.ncommits = 0;
3603 	s->commits = &s->real_commits;
3604 
3605 	TAILQ_INIT(&s->limit_commits.head);
3606 	s->limit_view = 0;
3607 	s->limit_commits.ncommits = 0;
3608 
3609 	s->repo = repo;
3610 	if (head_ref_name) {
3611 		s->head_ref_name = strdup(head_ref_name);
3612 		if (s->head_ref_name == NULL) {
3613 			err = got_error_from_errno("strdup");
3614 			goto done;
3615 		}
3616 	}
3617 	s->start_id = got_object_id_dup(start_id);
3618 	if (s->start_id == NULL) {
3619 		err = got_error_from_errno("got_object_id_dup");
3620 		goto done;
3621 	}
3622 	s->log_branches = log_branches;
3623 	s->use_committer = 1;
3624 
3625 	STAILQ_INIT(&s->colors);
3626 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3627 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3628 		    get_color_value("TOG_COLOR_COMMIT"));
3629 		if (err)
3630 			goto done;
3631 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3632 		    get_color_value("TOG_COLOR_AUTHOR"));
3633 		if (err) {
3634 			free_colors(&s->colors);
3635 			goto done;
3636 		}
3637 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3638 		    get_color_value("TOG_COLOR_DATE"));
3639 		if (err) {
3640 			free_colors(&s->colors);
3641 			goto done;
3642 		}
3643 	}
3644 
3645 	view->show = show_log_view;
3646 	view->input = input_log_view;
3647 	view->resize = resize_log_view;
3648 	view->close = close_log_view;
3649 	view->search_start = search_start_log_view;
3650 	view->search_next = search_next_log_view;
3651 
3652 	if (s->thread_args.pack_fds == NULL) {
3653 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3654 		if (err)
3655 			goto done;
3656 	}
3657 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3658 	    s->thread_args.pack_fds);
3659 	if (err)
3660 		goto done;
3661 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3662 	    !s->log_branches);
3663 	if (err)
3664 		goto done;
3665 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3666 	    s->repo, NULL, NULL);
3667 	if (err)
3668 		goto done;
3669 
3670 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3671 	if (errcode) {
3672 		err = got_error_set_errno(errcode, "pthread_cond_init");
3673 		goto done;
3674 	}
3675 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3676 	if (errcode) {
3677 		err = got_error_set_errno(errcode, "pthread_cond_init");
3678 		goto done;
3679 	}
3680 
3681 	s->thread_args.commits_needed = view->nlines;
3682 	s->thread_args.graph = thread_graph;
3683 	s->thread_args.real_commits = &s->real_commits;
3684 	s->thread_args.limit_commits = &s->limit_commits;
3685 	s->thread_args.in_repo_path = s->in_repo_path;
3686 	s->thread_args.start_id = s->start_id;
3687 	s->thread_args.repo = thread_repo;
3688 	s->thread_args.log_complete = 0;
3689 	s->thread_args.quit = &s->quit;
3690 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3691 	s->thread_args.selected_entry = &s->selected_entry;
3692 	s->thread_args.searching = &view->searching;
3693 	s->thread_args.search_next_done = &view->search_next_done;
3694 	s->thread_args.regex = &view->regex;
3695 	s->thread_args.limiting = &s->limit_view;
3696 	s->thread_args.limit_regex = &s->limit_regex;
3697 	s->thread_args.limit_commits = &s->limit_commits;
3698 done:
3699 	if (err)
3700 		close_log_view(view);
3701 	return err;
3702 }
3703 
3704 static const struct got_error *
3705 show_log_view(struct tog_view *view)
3706 {
3707 	const struct got_error *err;
3708 	struct tog_log_view_state *s = &view->state.log;
3709 
3710 	if (s->thread == 0) { //NULL) {
3711 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3712 		    &s->thread_args);
3713 		if (errcode)
3714 			return got_error_set_errno(errcode, "pthread_create");
3715 		if (s->thread_args.commits_needed > 0) {
3716 			err = trigger_log_thread(view, 1);
3717 			if (err)
3718 				return err;
3719 		}
3720 	}
3721 
3722 	return draw_commits(view);
3723 }
3724 
3725 static void
3726 log_move_cursor_up(struct tog_view *view, int page, int home)
3727 {
3728 	struct tog_log_view_state *s = &view->state.log;
3729 
3730 	if (s->first_displayed_entry == NULL)
3731 		return;
3732 	if (s->selected_entry->idx == 0)
3733 		view->count = 0;
3734 
3735 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3736 	    || home)
3737 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3738 
3739 	if (!page && !home && s->selected > 0)
3740 		--s->selected;
3741 	else
3742 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3743 
3744 	select_commit(s);
3745 	return;
3746 }
3747 
3748 static const struct got_error *
3749 log_move_cursor_down(struct tog_view *view, int page)
3750 {
3751 	struct tog_log_view_state	*s = &view->state.log;
3752 	const struct got_error		*err = NULL;
3753 	int				 eos = view->nlines - 2;
3754 
3755 	if (s->first_displayed_entry == NULL)
3756 		return NULL;
3757 
3758 	if (s->thread_args.log_complete &&
3759 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3760 		return NULL;
3761 
3762 	if (view_is_hsplit_top(view))
3763 		--eos;  /* border consumes the last line */
3764 
3765 	if (!page) {
3766 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3767 			++s->selected;
3768 		else
3769 			err = log_scroll_down(view, 1);
3770 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3771 		struct commit_queue_entry *entry;
3772 		int n;
3773 
3774 		s->selected = 0;
3775 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3776 		s->last_displayed_entry = entry;
3777 		for (n = 0; n <= eos; n++) {
3778 			if (entry == NULL)
3779 				break;
3780 			s->first_displayed_entry = entry;
3781 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3782 		}
3783 		if (n > 0)
3784 			s->selected = n - 1;
3785 	} else {
3786 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3787 		    s->thread_args.log_complete)
3788 			s->selected += MIN(page,
3789 			    s->commits->ncommits - s->selected_entry->idx - 1);
3790 		else
3791 			err = log_scroll_down(view, page);
3792 	}
3793 	if (err)
3794 		return err;
3795 
3796 	/*
3797 	 * We might necessarily overshoot in horizontal
3798 	 * splits; if so, select the last displayed commit.
3799 	 */
3800 	if (s->first_displayed_entry && s->last_displayed_entry) {
3801 		s->selected = MIN(s->selected,
3802 		    s->last_displayed_entry->idx -
3803 		    s->first_displayed_entry->idx);
3804 	}
3805 
3806 	select_commit(s);
3807 
3808 	if (s->thread_args.log_complete &&
3809 	    s->selected_entry->idx == s->commits->ncommits - 1)
3810 		view->count = 0;
3811 
3812 	return NULL;
3813 }
3814 
3815 static void
3816 view_get_split(struct tog_view *view, int *y, int *x)
3817 {
3818 	*x = 0;
3819 	*y = 0;
3820 
3821 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3822 		if (view->child && view->child->resized_y)
3823 			*y = view->child->resized_y;
3824 		else if (view->resized_y)
3825 			*y = view->resized_y;
3826 		else
3827 			*y = view_split_begin_y(view->lines);
3828 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3829 		if (view->child && view->child->resized_x)
3830 			*x = view->child->resized_x;
3831 		else if (view->resized_x)
3832 			*x = view->resized_x;
3833 		else
3834 			*x = view_split_begin_x(view->begin_x);
3835 	}
3836 }
3837 
3838 /* Split view horizontally at y and offset view->state->selected line. */
3839 static const struct got_error *
3840 view_init_hsplit(struct tog_view *view, int y)
3841 {
3842 	const struct got_error *err = NULL;
3843 
3844 	view->nlines = y;
3845 	view->ncols = COLS;
3846 	err = view_resize(view);
3847 	if (err)
3848 		return err;
3849 
3850 	err = offset_selection_down(view);
3851 
3852 	return err;
3853 }
3854 
3855 static const struct got_error *
3856 log_goto_line(struct tog_view *view, int nlines)
3857 {
3858 	const struct got_error		*err = NULL;
3859 	struct tog_log_view_state	*s = &view->state.log;
3860 	int				 g, idx = s->selected_entry->idx;
3861 
3862 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3863 		return NULL;
3864 
3865 	g = view->gline;
3866 	view->gline = 0;
3867 
3868 	if (g >= s->first_displayed_entry->idx + 1 &&
3869 	    g <= s->last_displayed_entry->idx + 1 &&
3870 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3871 		s->selected = g - s->first_displayed_entry->idx - 1;
3872 		select_commit(s);
3873 		return NULL;
3874 	}
3875 
3876 	if (idx + 1 < g) {
3877 		err = log_move_cursor_down(view, g - idx - 1);
3878 		if (!err && g > s->selected_entry->idx + 1)
3879 			err = log_move_cursor_down(view,
3880 			    g - s->first_displayed_entry->idx - 1);
3881 		if (err)
3882 			return err;
3883 	} else if (idx + 1 > g)
3884 		log_move_cursor_up(view, idx - g + 1, 0);
3885 
3886 	if (g < nlines && s->first_displayed_entry->idx == 0)
3887 		s->selected = g - 1;
3888 
3889 	select_commit(s);
3890 	return NULL;
3891 
3892 }
3893 
3894 static void
3895 horizontal_scroll_input(struct tog_view *view, int ch)
3896 {
3897 
3898 	switch (ch) {
3899 	case KEY_LEFT:
3900 	case 'h':
3901 		view->x -= MIN(view->x, 2);
3902 		if (view->x <= 0)
3903 			view->count = 0;
3904 		break;
3905 	case KEY_RIGHT:
3906 	case 'l':
3907 		if (view->x + view->ncols / 2 < view->maxx)
3908 			view->x += 2;
3909 		else
3910 			view->count = 0;
3911 		break;
3912 	case '0':
3913 		view->x = 0;
3914 		break;
3915 	case '$':
3916 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3917 		view->count = 0;
3918 		break;
3919 	default:
3920 		break;
3921 	}
3922 }
3923 
3924 static const struct got_error *
3925 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3926 {
3927 	const struct got_error *err = NULL;
3928 	struct tog_log_view_state *s = &view->state.log;
3929 	int eos, nscroll;
3930 
3931 	if (s->thread_args.load_all) {
3932 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3933 			s->thread_args.load_all = 0;
3934 		else if (s->thread_args.log_complete) {
3935 			err = log_move_cursor_down(view, s->commits->ncommits);
3936 			s->thread_args.load_all = 0;
3937 		}
3938 		if (err)
3939 			return err;
3940 	}
3941 
3942 	eos = nscroll = view->nlines - 1;
3943 	if (view_is_hsplit_top(view))
3944 		--eos;  /* border */
3945 
3946 	if (view->gline)
3947 		return log_goto_line(view, eos);
3948 
3949 	switch (ch) {
3950 	case '&':
3951 		err = limit_log_view(view);
3952 		break;
3953 	case 'q':
3954 		s->quit = 1;
3955 		break;
3956 	case '0':
3957 	case '$':
3958 	case KEY_RIGHT:
3959 	case 'l':
3960 	case KEY_LEFT:
3961 	case 'h':
3962 		horizontal_scroll_input(view, ch);
3963 		break;
3964 	case 'k':
3965 	case KEY_UP:
3966 	case '<':
3967 	case ',':
3968 	case CTRL('p'):
3969 		log_move_cursor_up(view, 0, 0);
3970 		break;
3971 	case 'g':
3972 	case '=':
3973 	case KEY_HOME:
3974 		log_move_cursor_up(view, 0, 1);
3975 		view->count = 0;
3976 		break;
3977 	case CTRL('u'):
3978 	case 'u':
3979 		nscroll /= 2;
3980 		/* FALL THROUGH */
3981 	case KEY_PPAGE:
3982 	case CTRL('b'):
3983 	case 'b':
3984 		log_move_cursor_up(view, nscroll, 0);
3985 		break;
3986 	case 'j':
3987 	case KEY_DOWN:
3988 	case '>':
3989 	case '.':
3990 	case CTRL('n'):
3991 		err = log_move_cursor_down(view, 0);
3992 		break;
3993 	case '@':
3994 		s->use_committer = !s->use_committer;
3995 		view->action = s->use_committer ?
3996 		    "show committer" : "show commit author";
3997 		break;
3998 	case 'G':
3999 	case '*':
4000 	case KEY_END: {
4001 		/* We don't know yet how many commits, so we're forced to
4002 		 * traverse them all. */
4003 		view->count = 0;
4004 		s->thread_args.load_all = 1;
4005 		if (!s->thread_args.log_complete)
4006 			return trigger_log_thread(view, 0);
4007 		err = log_move_cursor_down(view, s->commits->ncommits);
4008 		s->thread_args.load_all = 0;
4009 		break;
4010 	}
4011 	case CTRL('d'):
4012 	case 'd':
4013 		nscroll /= 2;
4014 		/* FALL THROUGH */
4015 	case KEY_NPAGE:
4016 	case CTRL('f'):
4017 	case 'f':
4018 	case ' ':
4019 		err = log_move_cursor_down(view, nscroll);
4020 		break;
4021 	case KEY_RESIZE:
4022 		if (s->selected > view->nlines - 2)
4023 			s->selected = view->nlines - 2;
4024 		if (s->selected > s->commits->ncommits - 1)
4025 			s->selected = s->commits->ncommits - 1;
4026 		select_commit(s);
4027 		if (s->commits->ncommits < view->nlines - 1 &&
4028 		    !s->thread_args.log_complete) {
4029 			s->thread_args.commits_needed += (view->nlines - 1) -
4030 			    s->commits->ncommits;
4031 			err = trigger_log_thread(view, 1);
4032 		}
4033 		break;
4034 	case KEY_ENTER:
4035 	case '\r':
4036 		view->count = 0;
4037 		if (s->selected_entry == NULL)
4038 			break;
4039 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4040 		break;
4041 	case 'T':
4042 		view->count = 0;
4043 		if (s->selected_entry == NULL)
4044 			break;
4045 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4046 		break;
4047 	case KEY_BACKSPACE:
4048 	case CTRL('l'):
4049 	case 'B':
4050 		view->count = 0;
4051 		if (ch == KEY_BACKSPACE &&
4052 		    got_path_is_root_dir(s->in_repo_path))
4053 			break;
4054 		err = stop_log_thread(s);
4055 		if (err)
4056 			return err;
4057 		if (ch == KEY_BACKSPACE) {
4058 			char *parent_path;
4059 			err = got_path_dirname(&parent_path, s->in_repo_path);
4060 			if (err)
4061 				return err;
4062 			free(s->in_repo_path);
4063 			s->in_repo_path = parent_path;
4064 			s->thread_args.in_repo_path = s->in_repo_path;
4065 		} else if (ch == CTRL('l')) {
4066 			struct got_object_id *start_id;
4067 			err = got_repo_match_object_id(&start_id, NULL,
4068 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4069 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4070 			if (err) {
4071 				if (s->head_ref_name == NULL ||
4072 				    err->code != GOT_ERR_NOT_REF)
4073 					return err;
4074 				/* Try to cope with deleted references. */
4075 				free(s->head_ref_name);
4076 				s->head_ref_name = NULL;
4077 				err = got_repo_match_object_id(&start_id,
4078 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4079 				    &tog_refs, s->repo);
4080 				if (err)
4081 					return err;
4082 			}
4083 			free(s->start_id);
4084 			s->start_id = start_id;
4085 			s->thread_args.start_id = s->start_id;
4086 		} else /* 'B' */
4087 			s->log_branches = !s->log_branches;
4088 
4089 		if (s->thread_args.pack_fds == NULL) {
4090 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4091 			if (err)
4092 				return err;
4093 		}
4094 		err = got_repo_open(&s->thread_args.repo,
4095 		    got_repo_get_path(s->repo), NULL,
4096 		    s->thread_args.pack_fds);
4097 		if (err)
4098 			return err;
4099 		tog_free_refs();
4100 		err = tog_load_refs(s->repo, 0);
4101 		if (err)
4102 			return err;
4103 		err = got_commit_graph_open(&s->thread_args.graph,
4104 		    s->in_repo_path, !s->log_branches);
4105 		if (err)
4106 			return err;
4107 		err = got_commit_graph_iter_start(s->thread_args.graph,
4108 		    s->start_id, s->repo, NULL, NULL);
4109 		if (err)
4110 			return err;
4111 		free_commits(&s->real_commits);
4112 		free_commits(&s->limit_commits);
4113 		s->first_displayed_entry = NULL;
4114 		s->last_displayed_entry = NULL;
4115 		s->selected_entry = NULL;
4116 		s->selected = 0;
4117 		s->thread_args.log_complete = 0;
4118 		s->quit = 0;
4119 		s->thread_args.commits_needed = view->lines;
4120 		s->matched_entry = NULL;
4121 		s->search_entry = NULL;
4122 		view->offset = 0;
4123 		break;
4124 	case 'R':
4125 		view->count = 0;
4126 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4127 		break;
4128 	default:
4129 		view->count = 0;
4130 		break;
4131 	}
4132 
4133 	return err;
4134 }
4135 
4136 static const struct got_error *
4137 apply_unveil(const char *repo_path, const char *worktree_path)
4138 {
4139 	const struct got_error *error;
4140 
4141 #ifdef PROFILE
4142 	if (unveil("gmon.out", "rwc") != 0)
4143 		return got_error_from_errno2("unveil", "gmon.out");
4144 #endif
4145 	if (repo_path && unveil(repo_path, "r") != 0)
4146 		return got_error_from_errno2("unveil", repo_path);
4147 
4148 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4149 		return got_error_from_errno2("unveil", worktree_path);
4150 
4151 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4152 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4153 
4154 	error = got_privsep_unveil_exec_helpers();
4155 	if (error != NULL)
4156 		return error;
4157 
4158 	if (unveil(NULL, NULL) != 0)
4159 		return got_error_from_errno("unveil");
4160 
4161 	return NULL;
4162 }
4163 
4164 static const struct got_error *
4165 init_mock_term(struct tog_io **tog_io, const char *test_script_path)
4166 {
4167 	const struct got_error	*err = NULL;
4168 	struct tog_io		*io;
4169 
4170 	if (*tog_io)
4171 		*tog_io = NULL;
4172 
4173 	if (test_script_path == NULL || *test_script_path == '\0')
4174 		return got_error_msg(GOT_ERR_IO, "GOT_TOG_TEST not defined");
4175 
4176 	io = calloc(1, sizeof(*io));
4177 	if (io == NULL)
4178 		return got_error_from_errno("calloc");
4179 
4180 	io->f = fopen(test_script_path, "re");
4181 	if (io->f == NULL) {
4182 		err = got_error_from_errno_fmt("fopen: %s",
4183 		    test_script_path);
4184 		goto done;
4185 	}
4186 
4187 	/* test mode, we don't want any output */
4188 	io->cout = fopen("/dev/null", "w+");
4189 	if (io->cout == NULL) {
4190 		err = got_error_from_errno("fopen: /dev/null");
4191 		goto done;
4192 	}
4193 
4194 	io->cin = fopen("/dev/tty", "r+");
4195 	if (io->cin == NULL) {
4196 		err = got_error_from_errno("fopen: /dev/tty");
4197 		goto done;
4198 	}
4199 
4200 	if (fseeko(io->f, 0L, SEEK_SET) == -1) {
4201 		err = got_error_from_errno("fseeko");
4202 		goto done;
4203 	}
4204 
4205 	/*
4206 	 * XXX Perhaps we should define "xterm" as the terminal
4207 	 * type for standardised testing instead of using $TERM?
4208 	 */
4209 	if (newterm(NULL, io->cout, io->cin) == NULL)
4210 		err = got_error_msg(GOT_ERR_IO,
4211 		    "newterm: failed to initialise curses");
4212 done:
4213 	if (err)
4214 		tog_io_close(io);
4215 	else
4216 		*tog_io = io;
4217 	return err;
4218 }
4219 
4220 static const struct got_error *
4221 init_curses(struct tog_io **tog_io)
4222 {
4223 	const struct got_error	*err = NULL;
4224 	const char		*test_script_path;
4225 
4226 	/*
4227 	 * Override default signal handlers before starting ncurses.
4228 	 * This should prevent ncurses from installing its own
4229 	 * broken cleanup() signal handler.
4230 	 */
4231 	signal(SIGWINCH, tog_sigwinch);
4232 	signal(SIGPIPE, tog_sigpipe);
4233 	signal(SIGCONT, tog_sigcont);
4234 	signal(SIGINT, tog_sigint);
4235 	signal(SIGTERM, tog_sigterm);
4236 
4237 	test_script_path = getenv("GOT_TOG_TEST");
4238 	if (test_script_path != NULL) {
4239 		err = init_mock_term(tog_io, test_script_path);
4240 		if (err)
4241 			return err;
4242 	} else
4243 		initscr();
4244 
4245 	cbreak();
4246 	halfdelay(1); /* Do fast refresh while initial view is loading. */
4247 	noecho();
4248 	nonl();
4249 	intrflush(stdscr, FALSE);
4250 	keypad(stdscr, TRUE);
4251 	curs_set(0);
4252 	if (getenv("TOG_COLORS") != NULL) {
4253 		start_color();
4254 		use_default_colors();
4255 	}
4256 
4257 	return NULL;
4258 }
4259 
4260 static const struct got_error *
4261 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4262     struct got_repository *repo, struct got_worktree *worktree)
4263 {
4264 	const struct got_error *err = NULL;
4265 
4266 	if (argc == 0) {
4267 		*in_repo_path = strdup("/");
4268 		if (*in_repo_path == NULL)
4269 			return got_error_from_errno("strdup");
4270 		return NULL;
4271 	}
4272 
4273 	if (worktree) {
4274 		const char *prefix = got_worktree_get_path_prefix(worktree);
4275 		char *p;
4276 
4277 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4278 		if (err)
4279 			return err;
4280 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4281 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4282 		    p) == -1) {
4283 			err = got_error_from_errno("asprintf");
4284 			*in_repo_path = NULL;
4285 		}
4286 		free(p);
4287 	} else
4288 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4289 
4290 	return err;
4291 }
4292 
4293 static const struct got_error *
4294 cmd_log(int argc, char *argv[])
4295 {
4296 	const struct got_error *io_err, *error;
4297 	struct got_repository *repo = NULL;
4298 	struct got_worktree *worktree = NULL;
4299 	struct got_object_id *start_id = NULL;
4300 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4301 	char *start_commit = NULL, *label = NULL;
4302 	struct got_reference *ref = NULL;
4303 	const char *head_ref_name = NULL;
4304 	int ch, log_branches = 0;
4305 	struct tog_view *view;
4306 	struct tog_io *tog_io = NULL;
4307 	int *pack_fds = NULL;
4308 
4309 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4310 		switch (ch) {
4311 		case 'b':
4312 			log_branches = 1;
4313 			break;
4314 		case 'c':
4315 			start_commit = optarg;
4316 			break;
4317 		case 'r':
4318 			repo_path = realpath(optarg, NULL);
4319 			if (repo_path == NULL)
4320 				return got_error_from_errno2("realpath",
4321 				    optarg);
4322 			break;
4323 		default:
4324 			usage_log();
4325 			/* NOTREACHED */
4326 		}
4327 	}
4328 
4329 	argc -= optind;
4330 	argv += optind;
4331 
4332 	if (argc > 1)
4333 		usage_log();
4334 
4335 	error = got_repo_pack_fds_open(&pack_fds);
4336 	if (error != NULL)
4337 		goto done;
4338 
4339 	if (repo_path == NULL) {
4340 		cwd = getcwd(NULL, 0);
4341 		if (cwd == NULL)
4342 			return got_error_from_errno("getcwd");
4343 		error = got_worktree_open(&worktree, cwd);
4344 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4345 			goto done;
4346 		if (worktree)
4347 			repo_path =
4348 			    strdup(got_worktree_get_repo_path(worktree));
4349 		else
4350 			repo_path = strdup(cwd);
4351 		if (repo_path == NULL) {
4352 			error = got_error_from_errno("strdup");
4353 			goto done;
4354 		}
4355 	}
4356 
4357 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4358 	if (error != NULL)
4359 		goto done;
4360 
4361 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4362 	    repo, worktree);
4363 	if (error)
4364 		goto done;
4365 
4366 	error = init_curses(&tog_io);
4367 	if (error)
4368 		goto done;
4369 
4370 	error = apply_unveil(got_repo_get_path(repo),
4371 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4372 	if (error)
4373 		goto done;
4374 
4375 	/* already loaded by tog_log_with_path()? */
4376 	if (TAILQ_EMPTY(&tog_refs)) {
4377 		error = tog_load_refs(repo, 0);
4378 		if (error)
4379 			goto done;
4380 	}
4381 
4382 	if (start_commit == NULL) {
4383 		error = got_repo_match_object_id(&start_id, &label,
4384 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4385 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4386 		if (error)
4387 			goto done;
4388 		head_ref_name = label;
4389 	} else {
4390 		error = got_ref_open(&ref, repo, start_commit, 0);
4391 		if (error == NULL)
4392 			head_ref_name = got_ref_get_name(ref);
4393 		else if (error->code != GOT_ERR_NOT_REF)
4394 			goto done;
4395 		error = got_repo_match_object_id(&start_id, NULL,
4396 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4397 		if (error)
4398 			goto done;
4399 	}
4400 
4401 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4402 	if (view == NULL) {
4403 		error = got_error_from_errno("view_open");
4404 		goto done;
4405 	}
4406 	error = open_log_view(view, start_id, repo, head_ref_name,
4407 	    in_repo_path, log_branches);
4408 	if (error)
4409 		goto done;
4410 	if (worktree) {
4411 		/* Release work tree lock. */
4412 		got_worktree_close(worktree);
4413 		worktree = NULL;
4414 	}
4415 	error = view_loop(view, tog_io);
4416 done:
4417 	free(in_repo_path);
4418 	free(repo_path);
4419 	free(cwd);
4420 	free(start_id);
4421 	free(label);
4422 	if (ref)
4423 		got_ref_close(ref);
4424 	if (repo) {
4425 		const struct got_error *close_err = got_repo_close(repo);
4426 		if (error == NULL)
4427 			error = close_err;
4428 	}
4429 	if (worktree)
4430 		got_worktree_close(worktree);
4431 	if (pack_fds) {
4432 		const struct got_error *pack_err =
4433 		    got_repo_pack_fds_close(pack_fds);
4434 		if (error == NULL)
4435 			error = pack_err;
4436 	}
4437 	if (tog_io != NULL) {
4438 		io_err = tog_io_close(tog_io);
4439 		if (error == NULL)
4440 			error = io_err;
4441 	}
4442 	tog_free_refs();
4443 	return error;
4444 }
4445 
4446 __dead static void
4447 usage_diff(void)
4448 {
4449 	endwin();
4450 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4451 	    "object1 object2\n", getprogname());
4452 	exit(1);
4453 }
4454 
4455 static int
4456 match_line(const char *line, regex_t *regex, size_t nmatch,
4457     regmatch_t *regmatch)
4458 {
4459 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4460 }
4461 
4462 static struct tog_color *
4463 match_color(struct tog_colors *colors, const char *line)
4464 {
4465 	struct tog_color *tc = NULL;
4466 
4467 	STAILQ_FOREACH(tc, colors, entry) {
4468 		if (match_line(line, &tc->regex, 0, NULL))
4469 			return tc;
4470 	}
4471 
4472 	return NULL;
4473 }
4474 
4475 static const struct got_error *
4476 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4477     WINDOW *window, int skipcol, regmatch_t *regmatch)
4478 {
4479 	const struct got_error *err = NULL;
4480 	char *exstr = NULL;
4481 	wchar_t *wline = NULL;
4482 	int rme, rms, n, width, scrollx;
4483 	int width0 = 0, width1 = 0, width2 = 0;
4484 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4485 
4486 	*wtotal = 0;
4487 
4488 	rms = regmatch->rm_so;
4489 	rme = regmatch->rm_eo;
4490 
4491 	err = expand_tab(&exstr, line);
4492 	if (err)
4493 		return err;
4494 
4495 	/* Split the line into 3 segments, according to match offsets. */
4496 	seg0 = strndup(exstr, rms);
4497 	if (seg0 == NULL) {
4498 		err = got_error_from_errno("strndup");
4499 		goto done;
4500 	}
4501 	seg1 = strndup(exstr + rms, rme - rms);
4502 	if (seg1 == NULL) {
4503 		err = got_error_from_errno("strndup");
4504 		goto done;
4505 	}
4506 	seg2 = strdup(exstr + rme);
4507 	if (seg2 == NULL) {
4508 		err = got_error_from_errno("strndup");
4509 		goto done;
4510 	}
4511 
4512 	/* draw up to matched token if we haven't scrolled past it */
4513 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4514 	    col_tab_align, 1);
4515 	if (err)
4516 		goto done;
4517 	n = MAX(width0 - skipcol, 0);
4518 	if (n) {
4519 		free(wline);
4520 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4521 		    wlimit, col_tab_align, 1);
4522 		if (err)
4523 			goto done;
4524 		waddwstr(window, &wline[scrollx]);
4525 		wlimit -= width;
4526 		*wtotal += width;
4527 	}
4528 
4529 	if (wlimit > 0) {
4530 		int i = 0, w = 0;
4531 		size_t wlen;
4532 
4533 		free(wline);
4534 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4535 		    col_tab_align, 1);
4536 		if (err)
4537 			goto done;
4538 		wlen = wcslen(wline);
4539 		while (i < wlen) {
4540 			width = wcwidth(wline[i]);
4541 			if (width == -1) {
4542 				/* should not happen, tabs are expanded */
4543 				err = got_error(GOT_ERR_RANGE);
4544 				goto done;
4545 			}
4546 			if (width0 + w + width > skipcol)
4547 				break;
4548 			w += width;
4549 			i++;
4550 		}
4551 		/* draw (visible part of) matched token (if scrolled into it) */
4552 		if (width1 - w > 0) {
4553 			wattron(window, A_STANDOUT);
4554 			waddwstr(window, &wline[i]);
4555 			wattroff(window, A_STANDOUT);
4556 			wlimit -= (width1 - w);
4557 			*wtotal += (width1 - w);
4558 		}
4559 	}
4560 
4561 	if (wlimit > 0) {  /* draw rest of line */
4562 		free(wline);
4563 		if (skipcol > width0 + width1) {
4564 			err = format_line(&wline, &width2, &scrollx, seg2,
4565 			    skipcol - (width0 + width1), wlimit,
4566 			    col_tab_align, 1);
4567 			if (err)
4568 				goto done;
4569 			waddwstr(window, &wline[scrollx]);
4570 		} else {
4571 			err = format_line(&wline, &width2, NULL, seg2, 0,
4572 			    wlimit, col_tab_align, 1);
4573 			if (err)
4574 				goto done;
4575 			waddwstr(window, wline);
4576 		}
4577 		*wtotal += width2;
4578 	}
4579 done:
4580 	free(wline);
4581 	free(exstr);
4582 	free(seg0);
4583 	free(seg1);
4584 	free(seg2);
4585 	return err;
4586 }
4587 
4588 static int
4589 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4590 {
4591 	FILE	*f = NULL;
4592 	int	*eof, *first, *selected;
4593 
4594 	if (view->type == TOG_VIEW_DIFF) {
4595 		struct tog_diff_view_state *s = &view->state.diff;
4596 
4597 		first = &s->first_displayed_line;
4598 		selected = first;
4599 		eof = &s->eof;
4600 		f = s->f;
4601 	} else if (view->type == TOG_VIEW_HELP) {
4602 		struct tog_help_view_state *s = &view->state.help;
4603 
4604 		first = &s->first_displayed_line;
4605 		selected = first;
4606 		eof = &s->eof;
4607 		f = s->f;
4608 	} else if (view->type == TOG_VIEW_BLAME) {
4609 		struct tog_blame_view_state *s = &view->state.blame;
4610 
4611 		first = &s->first_displayed_line;
4612 		selected = &s->selected_line;
4613 		eof = &s->eof;
4614 		f = s->blame.f;
4615 	} else
4616 		return 0;
4617 
4618 	/* Center gline in the middle of the page like vi(1). */
4619 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4620 		return 0;
4621 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4622 		rewind(f);
4623 		*eof = 0;
4624 		*first = 1;
4625 		*lineno = 0;
4626 		*nprinted = 0;
4627 		return 0;
4628 	}
4629 
4630 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4631 		view->gline : (view->nlines - 3) / 2 + 1;
4632 	view->gline = 0;
4633 
4634 	return 1;
4635 }
4636 
4637 static const struct got_error *
4638 draw_file(struct tog_view *view, const char *header)
4639 {
4640 	struct tog_diff_view_state *s = &view->state.diff;
4641 	regmatch_t *regmatch = &view->regmatch;
4642 	const struct got_error *err;
4643 	int nprinted = 0;
4644 	char *line;
4645 	size_t linesize = 0;
4646 	ssize_t linelen;
4647 	wchar_t *wline;
4648 	int width;
4649 	int max_lines = view->nlines;
4650 	int nlines = s->nlines;
4651 	off_t line_offset;
4652 
4653 	s->lineno = s->first_displayed_line - 1;
4654 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4655 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4656 		return got_error_from_errno("fseek");
4657 
4658 	werase(view->window);
4659 
4660 	if (view->gline > s->nlines - 1)
4661 		view->gline = s->nlines - 1;
4662 
4663 	if (header) {
4664 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4665 		    1 : view->gline - (view->nlines - 3) / 2 :
4666 		    s->lineno + s->selected_line;
4667 
4668 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4669 			return got_error_from_errno("asprintf");
4670 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4671 		    0, 0);
4672 		free(line);
4673 		if (err)
4674 			return err;
4675 
4676 		if (view_needs_focus_indication(view))
4677 			wstandout(view->window);
4678 		waddwstr(view->window, wline);
4679 		free(wline);
4680 		wline = NULL;
4681 		while (width++ < view->ncols)
4682 			waddch(view->window, ' ');
4683 		if (view_needs_focus_indication(view))
4684 			wstandend(view->window);
4685 
4686 		if (max_lines <= 1)
4687 			return NULL;
4688 		max_lines--;
4689 	}
4690 
4691 	s->eof = 0;
4692 	view->maxx = 0;
4693 	line = NULL;
4694 	while (max_lines > 0 && nprinted < max_lines) {
4695 		enum got_diff_line_type linetype;
4696 		attr_t attr = 0;
4697 
4698 		linelen = getline(&line, &linesize, s->f);
4699 		if (linelen == -1) {
4700 			if (feof(s->f)) {
4701 				s->eof = 1;
4702 				break;
4703 			}
4704 			free(line);
4705 			return got_ferror(s->f, GOT_ERR_IO);
4706 		}
4707 
4708 		if (++s->lineno < s->first_displayed_line)
4709 			continue;
4710 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4711 			continue;
4712 		if (s->lineno == view->hiline)
4713 			attr = A_STANDOUT;
4714 
4715 		/* Set view->maxx based on full line length. */
4716 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4717 		    view->x ? 1 : 0);
4718 		if (err) {
4719 			free(line);
4720 			return err;
4721 		}
4722 		view->maxx = MAX(view->maxx, width);
4723 		free(wline);
4724 		wline = NULL;
4725 
4726 		linetype = s->lines[s->lineno].type;
4727 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4728 		    linetype < GOT_DIFF_LINE_CONTEXT)
4729 			attr |= COLOR_PAIR(linetype);
4730 		if (attr)
4731 			wattron(view->window, attr);
4732 		if (s->first_displayed_line + nprinted == s->matched_line &&
4733 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4734 			err = add_matched_line(&width, line, view->ncols, 0,
4735 			    view->window, view->x, regmatch);
4736 			if (err) {
4737 				free(line);
4738 				return err;
4739 			}
4740 		} else {
4741 			int skip;
4742 			err = format_line(&wline, &width, &skip, line,
4743 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4744 			if (err) {
4745 				free(line);
4746 				return err;
4747 			}
4748 			waddwstr(view->window, &wline[skip]);
4749 			free(wline);
4750 			wline = NULL;
4751 		}
4752 		if (s->lineno == view->hiline) {
4753 			/* highlight full gline length */
4754 			while (width++ < view->ncols)
4755 				waddch(view->window, ' ');
4756 		} else {
4757 			if (width <= view->ncols - 1)
4758 				waddch(view->window, '\n');
4759 		}
4760 		if (attr)
4761 			wattroff(view->window, attr);
4762 		if (++nprinted == 1)
4763 			s->first_displayed_line = s->lineno;
4764 	}
4765 	free(line);
4766 	if (nprinted >= 1)
4767 		s->last_displayed_line = s->first_displayed_line +
4768 		    (nprinted - 1);
4769 	else
4770 		s->last_displayed_line = s->first_displayed_line;
4771 
4772 	view_border(view);
4773 
4774 	if (s->eof) {
4775 		while (nprinted < view->nlines) {
4776 			waddch(view->window, '\n');
4777 			nprinted++;
4778 		}
4779 
4780 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4781 		    view->ncols, 0, 0);
4782 		if (err) {
4783 			return err;
4784 		}
4785 
4786 		wstandout(view->window);
4787 		waddwstr(view->window, wline);
4788 		free(wline);
4789 		wline = NULL;
4790 		wstandend(view->window);
4791 	}
4792 
4793 	return NULL;
4794 }
4795 
4796 static char *
4797 get_datestr(time_t *time, char *datebuf)
4798 {
4799 	struct tm mytm, *tm;
4800 	char *p, *s;
4801 
4802 	tm = gmtime_r(time, &mytm);
4803 	if (tm == NULL)
4804 		return NULL;
4805 	s = asctime_r(tm, datebuf);
4806 	if (s == NULL)
4807 		return NULL;
4808 	p = strchr(s, '\n');
4809 	if (p)
4810 		*p = '\0';
4811 	return s;
4812 }
4813 
4814 static const struct got_error *
4815 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4816     off_t off, uint8_t type)
4817 {
4818 	struct got_diff_line *p;
4819 
4820 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4821 	if (p == NULL)
4822 		return got_error_from_errno("reallocarray");
4823 	*lines = p;
4824 	(*lines)[*nlines].offset = off;
4825 	(*lines)[*nlines].type = type;
4826 	(*nlines)++;
4827 
4828 	return NULL;
4829 }
4830 
4831 static const struct got_error *
4832 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4833     struct got_diff_line *s_lines, size_t s_nlines)
4834 {
4835 	struct got_diff_line	*p;
4836 	char			 buf[BUFSIZ];
4837 	size_t			 i, r;
4838 
4839 	if (fseeko(src, 0L, SEEK_SET) == -1)
4840 		return got_error_from_errno("fseeko");
4841 
4842 	for (;;) {
4843 		r = fread(buf, 1, sizeof(buf), src);
4844 		if (r == 0) {
4845 			if (ferror(src))
4846 				return got_error_from_errno("fread");
4847 			if (feof(src))
4848 				break;
4849 		}
4850 		if (fwrite(buf, 1, r, dst) != r)
4851 			return got_ferror(dst, GOT_ERR_IO);
4852 	}
4853 
4854 	if (s_nlines == 0 && *d_nlines == 0)
4855 		return NULL;
4856 
4857 	/*
4858 	 * If commit info was in dst, increment line offsets
4859 	 * of the appended diff content, but skip s_lines[0]
4860 	 * because offset zero is already in *d_lines.
4861 	 */
4862 	if (*d_nlines > 0) {
4863 		for (i = 1; i < s_nlines; ++i)
4864 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4865 
4866 		if (s_nlines > 0) {
4867 			--s_nlines;
4868 			++s_lines;
4869 		}
4870 	}
4871 
4872 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4873 	if (p == NULL) {
4874 		/* d_lines is freed in close_diff_view() */
4875 		return got_error_from_errno("reallocarray");
4876 	}
4877 
4878 	*d_lines = p;
4879 
4880 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4881 	*d_nlines += s_nlines;
4882 
4883 	return NULL;
4884 }
4885 
4886 static const struct got_error *
4887 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4888     struct got_object_id *commit_id, struct got_reflist_head *refs,
4889     struct got_repository *repo, int ignore_ws, int force_text_diff,
4890     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4891 {
4892 	const struct got_error *err = NULL;
4893 	char datebuf[26], *datestr;
4894 	struct got_commit_object *commit;
4895 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4896 	time_t committer_time;
4897 	const char *author, *committer;
4898 	char *refs_str = NULL;
4899 	struct got_pathlist_entry *pe;
4900 	off_t outoff = 0;
4901 	int n;
4902 
4903 	if (refs) {
4904 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4905 		if (err)
4906 			return err;
4907 	}
4908 
4909 	err = got_object_open_as_commit(&commit, repo, commit_id);
4910 	if (err)
4911 		return err;
4912 
4913 	err = got_object_id_str(&id_str, commit_id);
4914 	if (err) {
4915 		err = got_error_from_errno("got_object_id_str");
4916 		goto done;
4917 	}
4918 
4919 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4920 	if (err)
4921 		goto done;
4922 
4923 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4924 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4925 	if (n < 0) {
4926 		err = got_error_from_errno("fprintf");
4927 		goto done;
4928 	}
4929 	outoff += n;
4930 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4931 	if (err)
4932 		goto done;
4933 
4934 	n = fprintf(outfile, "from: %s\n",
4935 	    got_object_commit_get_author(commit));
4936 	if (n < 0) {
4937 		err = got_error_from_errno("fprintf");
4938 		goto done;
4939 	}
4940 	outoff += n;
4941 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4942 	if (err)
4943 		goto done;
4944 
4945 	author = got_object_commit_get_author(commit);
4946 	committer = got_object_commit_get_committer(commit);
4947 	if (strcmp(author, committer) != 0) {
4948 		n = fprintf(outfile, "via: %s\n", committer);
4949 		if (n < 0) {
4950 			err = got_error_from_errno("fprintf");
4951 			goto done;
4952 		}
4953 		outoff += n;
4954 		err = add_line_metadata(lines, nlines, outoff,
4955 		    GOT_DIFF_LINE_AUTHOR);
4956 		if (err)
4957 			goto done;
4958 	}
4959 	committer_time = got_object_commit_get_committer_time(commit);
4960 	datestr = get_datestr(&committer_time, datebuf);
4961 	if (datestr) {
4962 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4963 		if (n < 0) {
4964 			err = got_error_from_errno("fprintf");
4965 			goto done;
4966 		}
4967 		outoff += n;
4968 		err = add_line_metadata(lines, nlines, outoff,
4969 		    GOT_DIFF_LINE_DATE);
4970 		if (err)
4971 			goto done;
4972 	}
4973 	if (got_object_commit_get_nparents(commit) > 1) {
4974 		const struct got_object_id_queue *parent_ids;
4975 		struct got_object_qid *qid;
4976 		int pn = 1;
4977 		parent_ids = got_object_commit_get_parent_ids(commit);
4978 		STAILQ_FOREACH(qid, parent_ids, entry) {
4979 			err = got_object_id_str(&id_str, &qid->id);
4980 			if (err)
4981 				goto done;
4982 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4983 			if (n < 0) {
4984 				err = got_error_from_errno("fprintf");
4985 				goto done;
4986 			}
4987 			outoff += n;
4988 			err = add_line_metadata(lines, nlines, outoff,
4989 			    GOT_DIFF_LINE_META);
4990 			if (err)
4991 				goto done;
4992 			free(id_str);
4993 			id_str = NULL;
4994 		}
4995 	}
4996 
4997 	err = got_object_commit_get_logmsg(&logmsg, commit);
4998 	if (err)
4999 		goto done;
5000 	s = logmsg;
5001 	while ((line = strsep(&s, "\n")) != NULL) {
5002 		n = fprintf(outfile, "%s\n", line);
5003 		if (n < 0) {
5004 			err = got_error_from_errno("fprintf");
5005 			goto done;
5006 		}
5007 		outoff += n;
5008 		err = add_line_metadata(lines, nlines, outoff,
5009 		    GOT_DIFF_LINE_LOGMSG);
5010 		if (err)
5011 			goto done;
5012 	}
5013 
5014 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5015 		struct got_diff_changed_path *cp = pe->data;
5016 		int pad = dsa->max_path_len - pe->path_len + 1;
5017 
5018 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5019 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5020 		    dsa->rm_cols + 1, cp->rm);
5021 		if (n < 0) {
5022 			err = got_error_from_errno("fprintf");
5023 			goto done;
5024 		}
5025 		outoff += n;
5026 		err = add_line_metadata(lines, nlines, outoff,
5027 		    GOT_DIFF_LINE_CHANGES);
5028 		if (err)
5029 			goto done;
5030 	}
5031 
5032 	fputc('\n', outfile);
5033 	outoff++;
5034 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5035 	if (err)
5036 		goto done;
5037 
5038 	n = fprintf(outfile,
5039 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5040 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5041 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5042 	if (n < 0) {
5043 		err = got_error_from_errno("fprintf");
5044 		goto done;
5045 	}
5046 	outoff += n;
5047 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5048 	if (err)
5049 		goto done;
5050 
5051 	fputc('\n', outfile);
5052 	outoff++;
5053 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5054 done:
5055 	free(id_str);
5056 	free(logmsg);
5057 	free(refs_str);
5058 	got_object_commit_close(commit);
5059 	if (err) {
5060 		free(*lines);
5061 		*lines = NULL;
5062 		*nlines = 0;
5063 	}
5064 	return err;
5065 }
5066 
5067 static const struct got_error *
5068 create_diff(struct tog_diff_view_state *s)
5069 {
5070 	const struct got_error *err = NULL;
5071 	FILE *f = NULL, *tmp_diff_file = NULL;
5072 	int obj_type;
5073 	struct got_diff_line *lines = NULL;
5074 	struct got_pathlist_head changed_paths;
5075 
5076 	TAILQ_INIT(&changed_paths);
5077 
5078 	free(s->lines);
5079 	s->lines = malloc(sizeof(*s->lines));
5080 	if (s->lines == NULL)
5081 		return got_error_from_errno("malloc");
5082 	s->nlines = 0;
5083 
5084 	f = got_opentemp();
5085 	if (f == NULL) {
5086 		err = got_error_from_errno("got_opentemp");
5087 		goto done;
5088 	}
5089 	tmp_diff_file = got_opentemp();
5090 	if (tmp_diff_file == NULL) {
5091 		err = got_error_from_errno("got_opentemp");
5092 		goto done;
5093 	}
5094 	if (s->f && fclose(s->f) == EOF) {
5095 		err = got_error_from_errno("fclose");
5096 		goto done;
5097 	}
5098 	s->f = f;
5099 
5100 	if (s->id1)
5101 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5102 	else
5103 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5104 	if (err)
5105 		goto done;
5106 
5107 	switch (obj_type) {
5108 	case GOT_OBJ_TYPE_BLOB:
5109 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5110 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5111 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5112 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5113 		    s->f);
5114 		break;
5115 	case GOT_OBJ_TYPE_TREE:
5116 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5117 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5118 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5119 		    s->force_text_diff, NULL, s->repo, s->f);
5120 		break;
5121 	case GOT_OBJ_TYPE_COMMIT: {
5122 		const struct got_object_id_queue *parent_ids;
5123 		struct got_object_qid *pid;
5124 		struct got_commit_object *commit2;
5125 		struct got_reflist_head *refs;
5126 		size_t nlines = 0;
5127 		struct got_diffstat_cb_arg dsa = {
5128 			0, 0, 0, 0, 0, 0,
5129 			&changed_paths,
5130 			s->ignore_whitespace,
5131 			s->force_text_diff,
5132 			tog_diff_algo
5133 		};
5134 
5135 		lines = malloc(sizeof(*lines));
5136 		if (lines == NULL) {
5137 			err = got_error_from_errno("malloc");
5138 			goto done;
5139 		}
5140 
5141 		/* build diff first in tmp file then append to commit info */
5142 		err = got_diff_objects_as_commits(&lines, &nlines,
5143 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5144 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5145 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5146 		if (err)
5147 			break;
5148 
5149 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5150 		if (err)
5151 			goto done;
5152 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5153 		/* Show commit info if we're diffing to a parent/root commit. */
5154 		if (s->id1 == NULL) {
5155 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5156 			    refs, s->repo, s->ignore_whitespace,
5157 			    s->force_text_diff, &dsa, s->f);
5158 			if (err)
5159 				goto done;
5160 		} else {
5161 			parent_ids = got_object_commit_get_parent_ids(commit2);
5162 			STAILQ_FOREACH(pid, parent_ids, entry) {
5163 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5164 					err = write_commit_info(&s->lines,
5165 					    &s->nlines, s->id2, refs, s->repo,
5166 					    s->ignore_whitespace,
5167 					    s->force_text_diff, &dsa, s->f);
5168 					if (err)
5169 						goto done;
5170 					break;
5171 				}
5172 			}
5173 		}
5174 		got_object_commit_close(commit2);
5175 
5176 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5177 		    lines, nlines);
5178 		break;
5179 	}
5180 	default:
5181 		err = got_error(GOT_ERR_OBJ_TYPE);
5182 		break;
5183 	}
5184 done:
5185 	free(lines);
5186 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5187 	if (s->f && fflush(s->f) != 0 && err == NULL)
5188 		err = got_error_from_errno("fflush");
5189 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5190 		err = got_error_from_errno("fclose");
5191 	return err;
5192 }
5193 
5194 static void
5195 diff_view_indicate_progress(struct tog_view *view)
5196 {
5197 	mvwaddstr(view->window, 0, 0, "diffing...");
5198 	update_panels();
5199 	doupdate();
5200 }
5201 
5202 static const struct got_error *
5203 search_start_diff_view(struct tog_view *view)
5204 {
5205 	struct tog_diff_view_state *s = &view->state.diff;
5206 
5207 	s->matched_line = 0;
5208 	return NULL;
5209 }
5210 
5211 static void
5212 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5213     size_t *nlines, int **first, int **last, int **match, int **selected)
5214 {
5215 	struct tog_diff_view_state *s = &view->state.diff;
5216 
5217 	*f = s->f;
5218 	*nlines = s->nlines;
5219 	*line_offsets = NULL;
5220 	*match = &s->matched_line;
5221 	*first = &s->first_displayed_line;
5222 	*last = &s->last_displayed_line;
5223 	*selected = &s->selected_line;
5224 }
5225 
5226 static const struct got_error *
5227 search_next_view_match(struct tog_view *view)
5228 {
5229 	const struct got_error *err = NULL;
5230 	FILE *f;
5231 	int lineno;
5232 	char *line = NULL;
5233 	size_t linesize = 0;
5234 	ssize_t linelen;
5235 	off_t *line_offsets;
5236 	size_t nlines = 0;
5237 	int *first, *last, *match, *selected;
5238 
5239 	if (!view->search_setup)
5240 		return got_error_msg(GOT_ERR_NOT_IMPL,
5241 		    "view search not supported");
5242 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5243 	    &match, &selected);
5244 
5245 	if (!view->searching) {
5246 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5247 		return NULL;
5248 	}
5249 
5250 	if (*match) {
5251 		if (view->searching == TOG_SEARCH_FORWARD)
5252 			lineno = *first + 1;
5253 		else
5254 			lineno = *first - 1;
5255 	} else
5256 		lineno = *first - 1 + *selected;
5257 
5258 	while (1) {
5259 		off_t offset;
5260 
5261 		if (lineno <= 0 || lineno > nlines) {
5262 			if (*match == 0) {
5263 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5264 				break;
5265 			}
5266 
5267 			if (view->searching == TOG_SEARCH_FORWARD)
5268 				lineno = 1;
5269 			else
5270 				lineno = nlines;
5271 		}
5272 
5273 		offset = view->type == TOG_VIEW_DIFF ?
5274 		    view->state.diff.lines[lineno - 1].offset :
5275 		    line_offsets[lineno - 1];
5276 		if (fseeko(f, offset, SEEK_SET) != 0) {
5277 			free(line);
5278 			return got_error_from_errno("fseeko");
5279 		}
5280 		linelen = getline(&line, &linesize, f);
5281 		if (linelen != -1) {
5282 			char *exstr;
5283 			err = expand_tab(&exstr, line);
5284 			if (err)
5285 				break;
5286 			if (match_line(exstr, &view->regex, 1,
5287 			    &view->regmatch)) {
5288 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5289 				*match = lineno;
5290 				free(exstr);
5291 				break;
5292 			}
5293 			free(exstr);
5294 		}
5295 		if (view->searching == TOG_SEARCH_FORWARD)
5296 			lineno++;
5297 		else
5298 			lineno--;
5299 	}
5300 	free(line);
5301 
5302 	if (*match) {
5303 		*first = *match;
5304 		*selected = 1;
5305 	}
5306 
5307 	return err;
5308 }
5309 
5310 static const struct got_error *
5311 close_diff_view(struct tog_view *view)
5312 {
5313 	const struct got_error *err = NULL;
5314 	struct tog_diff_view_state *s = &view->state.diff;
5315 
5316 	free(s->id1);
5317 	s->id1 = NULL;
5318 	free(s->id2);
5319 	s->id2 = NULL;
5320 	if (s->f && fclose(s->f) == EOF)
5321 		err = got_error_from_errno("fclose");
5322 	s->f = NULL;
5323 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5324 		err = got_error_from_errno("fclose");
5325 	s->f1 = NULL;
5326 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5327 		err = got_error_from_errno("fclose");
5328 	s->f2 = NULL;
5329 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5330 		err = got_error_from_errno("close");
5331 	s->fd1 = -1;
5332 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5333 		err = got_error_from_errno("close");
5334 	s->fd2 = -1;
5335 	free(s->lines);
5336 	s->lines = NULL;
5337 	s->nlines = 0;
5338 	return err;
5339 }
5340 
5341 static const struct got_error *
5342 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5343     struct got_object_id *id2, const char *label1, const char *label2,
5344     int diff_context, int ignore_whitespace, int force_text_diff,
5345     struct tog_view *parent_view, struct got_repository *repo)
5346 {
5347 	const struct got_error *err;
5348 	struct tog_diff_view_state *s = &view->state.diff;
5349 
5350 	memset(s, 0, sizeof(*s));
5351 	s->fd1 = -1;
5352 	s->fd2 = -1;
5353 
5354 	if (id1 != NULL && id2 != NULL) {
5355 	    int type1, type2;
5356 	    err = got_object_get_type(&type1, repo, id1);
5357 	    if (err)
5358 		return err;
5359 	    err = got_object_get_type(&type2, repo, id2);
5360 	    if (err)
5361 		return err;
5362 
5363 	    if (type1 != type2)
5364 		return got_error(GOT_ERR_OBJ_TYPE);
5365 	}
5366 	s->first_displayed_line = 1;
5367 	s->last_displayed_line = view->nlines;
5368 	s->selected_line = 1;
5369 	s->repo = repo;
5370 	s->id1 = id1;
5371 	s->id2 = id2;
5372 	s->label1 = label1;
5373 	s->label2 = label2;
5374 
5375 	if (id1) {
5376 		s->id1 = got_object_id_dup(id1);
5377 		if (s->id1 == NULL)
5378 			return got_error_from_errno("got_object_id_dup");
5379 	} else
5380 		s->id1 = NULL;
5381 
5382 	s->id2 = got_object_id_dup(id2);
5383 	if (s->id2 == NULL) {
5384 		err = got_error_from_errno("got_object_id_dup");
5385 		goto done;
5386 	}
5387 
5388 	s->f1 = got_opentemp();
5389 	if (s->f1 == NULL) {
5390 		err = got_error_from_errno("got_opentemp");
5391 		goto done;
5392 	}
5393 
5394 	s->f2 = got_opentemp();
5395 	if (s->f2 == NULL) {
5396 		err = got_error_from_errno("got_opentemp");
5397 		goto done;
5398 	}
5399 
5400 	s->fd1 = got_opentempfd();
5401 	if (s->fd1 == -1) {
5402 		err = got_error_from_errno("got_opentempfd");
5403 		goto done;
5404 	}
5405 
5406 	s->fd2 = got_opentempfd();
5407 	if (s->fd2 == -1) {
5408 		err = got_error_from_errno("got_opentempfd");
5409 		goto done;
5410 	}
5411 
5412 	s->diff_context = diff_context;
5413 	s->ignore_whitespace = ignore_whitespace;
5414 	s->force_text_diff = force_text_diff;
5415 	s->parent_view = parent_view;
5416 	s->repo = repo;
5417 
5418 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5419 		int rc;
5420 
5421 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5422 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5423 		if (rc != ERR)
5424 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5425 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5426 		if (rc != ERR)
5427 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5428 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5429 		if (rc != ERR)
5430 			rc = init_pair(GOT_DIFF_LINE_META,
5431 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5432 		if (rc != ERR)
5433 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5434 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5435 		if (rc != ERR)
5436 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5437 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5438 		if (rc != ERR)
5439 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5440 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5441 		if (rc != ERR)
5442 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5443 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5444 		if (rc != ERR)
5445 			rc = init_pair(GOT_DIFF_LINE_DATE,
5446 			    get_color_value("TOG_COLOR_DATE"), -1);
5447 		if (rc == ERR) {
5448 			err = got_error(GOT_ERR_RANGE);
5449 			goto done;
5450 		}
5451 	}
5452 
5453 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5454 	    view_is_splitscreen(view))
5455 		show_log_view(parent_view); /* draw border */
5456 	diff_view_indicate_progress(view);
5457 
5458 	err = create_diff(s);
5459 
5460 	view->show = show_diff_view;
5461 	view->input = input_diff_view;
5462 	view->reset = reset_diff_view;
5463 	view->close = close_diff_view;
5464 	view->search_start = search_start_diff_view;
5465 	view->search_setup = search_setup_diff_view;
5466 	view->search_next = search_next_view_match;
5467 done:
5468 	if (err)
5469 		close_diff_view(view);
5470 	return err;
5471 }
5472 
5473 static const struct got_error *
5474 show_diff_view(struct tog_view *view)
5475 {
5476 	const struct got_error *err;
5477 	struct tog_diff_view_state *s = &view->state.diff;
5478 	char *id_str1 = NULL, *id_str2, *header;
5479 	const char *label1, *label2;
5480 
5481 	if (s->id1) {
5482 		err = got_object_id_str(&id_str1, s->id1);
5483 		if (err)
5484 			return err;
5485 		label1 = s->label1 ? s->label1 : id_str1;
5486 	} else
5487 		label1 = "/dev/null";
5488 
5489 	err = got_object_id_str(&id_str2, s->id2);
5490 	if (err)
5491 		return err;
5492 	label2 = s->label2 ? s->label2 : id_str2;
5493 
5494 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5495 		err = got_error_from_errno("asprintf");
5496 		free(id_str1);
5497 		free(id_str2);
5498 		return err;
5499 	}
5500 	free(id_str1);
5501 	free(id_str2);
5502 
5503 	err = draw_file(view, header);
5504 	free(header);
5505 	return err;
5506 }
5507 
5508 static const struct got_error *
5509 set_selected_commit(struct tog_diff_view_state *s,
5510     struct commit_queue_entry *entry)
5511 {
5512 	const struct got_error *err;
5513 	const struct got_object_id_queue *parent_ids;
5514 	struct got_commit_object *selected_commit;
5515 	struct got_object_qid *pid;
5516 
5517 	free(s->id2);
5518 	s->id2 = got_object_id_dup(entry->id);
5519 	if (s->id2 == NULL)
5520 		return got_error_from_errno("got_object_id_dup");
5521 
5522 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5523 	if (err)
5524 		return err;
5525 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5526 	free(s->id1);
5527 	pid = STAILQ_FIRST(parent_ids);
5528 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5529 	got_object_commit_close(selected_commit);
5530 	return NULL;
5531 }
5532 
5533 static const struct got_error *
5534 reset_diff_view(struct tog_view *view)
5535 {
5536 	struct tog_diff_view_state *s = &view->state.diff;
5537 
5538 	view->count = 0;
5539 	wclear(view->window);
5540 	s->first_displayed_line = 1;
5541 	s->last_displayed_line = view->nlines;
5542 	s->matched_line = 0;
5543 	diff_view_indicate_progress(view);
5544 	return create_diff(s);
5545 }
5546 
5547 static void
5548 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5549 {
5550 	int start, i;
5551 
5552 	i = start = s->first_displayed_line - 1;
5553 
5554 	while (s->lines[i].type != type) {
5555 		if (i == 0)
5556 			i = s->nlines - 1;
5557 		if (--i == start)
5558 			return; /* do nothing, requested type not in file */
5559 	}
5560 
5561 	s->selected_line = 1;
5562 	s->first_displayed_line = i;
5563 }
5564 
5565 static void
5566 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5567 {
5568 	int start, i;
5569 
5570 	i = start = s->first_displayed_line + 1;
5571 
5572 	while (s->lines[i].type != type) {
5573 		if (i == s->nlines - 1)
5574 			i = 0;
5575 		if (++i == start)
5576 			return; /* do nothing, requested type not in file */
5577 	}
5578 
5579 	s->selected_line = 1;
5580 	s->first_displayed_line = i;
5581 }
5582 
5583 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5584     int, int, int);
5585 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5586     int, int);
5587 
5588 static const struct got_error *
5589 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5590 {
5591 	const struct got_error *err = NULL;
5592 	struct tog_diff_view_state *s = &view->state.diff;
5593 	struct tog_log_view_state *ls;
5594 	struct commit_queue_entry *old_selected_entry;
5595 	char *line = NULL;
5596 	size_t linesize = 0;
5597 	ssize_t linelen;
5598 	int i, nscroll = view->nlines - 1, up = 0;
5599 
5600 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5601 
5602 	switch (ch) {
5603 	case '0':
5604 	case '$':
5605 	case KEY_RIGHT:
5606 	case 'l':
5607 	case KEY_LEFT:
5608 	case 'h':
5609 		horizontal_scroll_input(view, ch);
5610 		break;
5611 	case 'a':
5612 	case 'w':
5613 		if (ch == 'a') {
5614 			s->force_text_diff = !s->force_text_diff;
5615 			view->action = s->force_text_diff ?
5616 			    "force ASCII text enabled" :
5617 			    "force ASCII text disabled";
5618 		}
5619 		else if (ch == 'w') {
5620 			s->ignore_whitespace = !s->ignore_whitespace;
5621 			view->action = s->ignore_whitespace ?
5622 			    "ignore whitespace enabled" :
5623 			    "ignore whitespace disabled";
5624 		}
5625 		err = reset_diff_view(view);
5626 		break;
5627 	case 'g':
5628 	case KEY_HOME:
5629 		s->first_displayed_line = 1;
5630 		view->count = 0;
5631 		break;
5632 	case 'G':
5633 	case KEY_END:
5634 		view->count = 0;
5635 		if (s->eof)
5636 			break;
5637 
5638 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5639 		s->eof = 1;
5640 		break;
5641 	case 'k':
5642 	case KEY_UP:
5643 	case CTRL('p'):
5644 		if (s->first_displayed_line > 1)
5645 			s->first_displayed_line--;
5646 		else
5647 			view->count = 0;
5648 		break;
5649 	case CTRL('u'):
5650 	case 'u':
5651 		nscroll /= 2;
5652 		/* FALL THROUGH */
5653 	case KEY_PPAGE:
5654 	case CTRL('b'):
5655 	case 'b':
5656 		if (s->first_displayed_line == 1) {
5657 			view->count = 0;
5658 			break;
5659 		}
5660 		i = 0;
5661 		while (i++ < nscroll && s->first_displayed_line > 1)
5662 			s->first_displayed_line--;
5663 		break;
5664 	case 'j':
5665 	case KEY_DOWN:
5666 	case CTRL('n'):
5667 		if (!s->eof)
5668 			s->first_displayed_line++;
5669 		else
5670 			view->count = 0;
5671 		break;
5672 	case CTRL('d'):
5673 	case 'd':
5674 		nscroll /= 2;
5675 		/* FALL THROUGH */
5676 	case KEY_NPAGE:
5677 	case CTRL('f'):
5678 	case 'f':
5679 	case ' ':
5680 		if (s->eof) {
5681 			view->count = 0;
5682 			break;
5683 		}
5684 		i = 0;
5685 		while (!s->eof && i++ < nscroll) {
5686 			linelen = getline(&line, &linesize, s->f);
5687 			s->first_displayed_line++;
5688 			if (linelen == -1) {
5689 				if (feof(s->f)) {
5690 					s->eof = 1;
5691 				} else
5692 					err = got_ferror(s->f, GOT_ERR_IO);
5693 				break;
5694 			}
5695 		}
5696 		free(line);
5697 		break;
5698 	case '(':
5699 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5700 		break;
5701 	case ')':
5702 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5703 		break;
5704 	case '{':
5705 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5706 		break;
5707 	case '}':
5708 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5709 		break;
5710 	case '[':
5711 		if (s->diff_context > 0) {
5712 			s->diff_context--;
5713 			s->matched_line = 0;
5714 			diff_view_indicate_progress(view);
5715 			err = create_diff(s);
5716 			if (s->first_displayed_line + view->nlines - 1 >
5717 			    s->nlines) {
5718 				s->first_displayed_line = 1;
5719 				s->last_displayed_line = view->nlines;
5720 			}
5721 		} else
5722 			view->count = 0;
5723 		break;
5724 	case ']':
5725 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5726 			s->diff_context++;
5727 			s->matched_line = 0;
5728 			diff_view_indicate_progress(view);
5729 			err = create_diff(s);
5730 		} else
5731 			view->count = 0;
5732 		break;
5733 	case '<':
5734 	case ',':
5735 	case 'K':
5736 		up = 1;
5737 		/* FALL THROUGH */
5738 	case '>':
5739 	case '.':
5740 	case 'J':
5741 		if (s->parent_view == NULL) {
5742 			view->count = 0;
5743 			break;
5744 		}
5745 		s->parent_view->count = view->count;
5746 
5747 		if (s->parent_view->type == TOG_VIEW_LOG) {
5748 			ls = &s->parent_view->state.log;
5749 			old_selected_entry = ls->selected_entry;
5750 
5751 			err = input_log_view(NULL, s->parent_view,
5752 			    up ? KEY_UP : KEY_DOWN);
5753 			if (err)
5754 				break;
5755 			view->count = s->parent_view->count;
5756 
5757 			if (old_selected_entry == ls->selected_entry)
5758 				break;
5759 
5760 			err = set_selected_commit(s, ls->selected_entry);
5761 			if (err)
5762 				break;
5763 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5764 			struct tog_blame_view_state *bs;
5765 			struct got_object_id *id, *prev_id;
5766 
5767 			bs = &s->parent_view->state.blame;
5768 			prev_id = get_annotation_for_line(bs->blame.lines,
5769 			    bs->blame.nlines, bs->last_diffed_line);
5770 
5771 			err = input_blame_view(&view, s->parent_view,
5772 			    up ? KEY_UP : KEY_DOWN);
5773 			if (err)
5774 				break;
5775 			view->count = s->parent_view->count;
5776 
5777 			if (prev_id == NULL)
5778 				break;
5779 			id = get_selected_commit_id(bs->blame.lines,
5780 			    bs->blame.nlines, bs->first_displayed_line,
5781 			    bs->selected_line);
5782 			if (id == NULL)
5783 				break;
5784 
5785 			if (!got_object_id_cmp(prev_id, id))
5786 				break;
5787 
5788 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5789 			if (err)
5790 				break;
5791 		}
5792 		s->first_displayed_line = 1;
5793 		s->last_displayed_line = view->nlines;
5794 		s->matched_line = 0;
5795 		view->x = 0;
5796 
5797 		diff_view_indicate_progress(view);
5798 		err = create_diff(s);
5799 		break;
5800 	default:
5801 		view->count = 0;
5802 		break;
5803 	}
5804 
5805 	return err;
5806 }
5807 
5808 static const struct got_error *
5809 cmd_diff(int argc, char *argv[])
5810 {
5811 	const struct got_error *io_err, *error;
5812 	struct got_repository *repo = NULL;
5813 	struct got_worktree *worktree = NULL;
5814 	struct got_object_id *id1 = NULL, *id2 = NULL;
5815 	char *repo_path = NULL, *cwd = NULL;
5816 	char *id_str1 = NULL, *id_str2 = NULL;
5817 	char *label1 = NULL, *label2 = NULL;
5818 	int diff_context = 3, ignore_whitespace = 0;
5819 	int ch, force_text_diff = 0;
5820 	const char *errstr;
5821 	struct tog_view *view;
5822 	struct tog_io *tog_io = NULL;
5823 	int *pack_fds = NULL;
5824 
5825 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5826 		switch (ch) {
5827 		case 'a':
5828 			force_text_diff = 1;
5829 			break;
5830 		case 'C':
5831 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5832 			    &errstr);
5833 			if (errstr != NULL)
5834 				errx(1, "number of context lines is %s: %s",
5835 				    errstr, errstr);
5836 			break;
5837 		case 'r':
5838 			repo_path = realpath(optarg, NULL);
5839 			if (repo_path == NULL)
5840 				return got_error_from_errno2("realpath",
5841 				    optarg);
5842 			got_path_strip_trailing_slashes(repo_path);
5843 			break;
5844 		case 'w':
5845 			ignore_whitespace = 1;
5846 			break;
5847 		default:
5848 			usage_diff();
5849 			/* NOTREACHED */
5850 		}
5851 	}
5852 
5853 	argc -= optind;
5854 	argv += optind;
5855 
5856 	if (argc == 0) {
5857 		usage_diff(); /* TODO show local worktree changes */
5858 	} else if (argc == 2) {
5859 		id_str1 = argv[0];
5860 		id_str2 = argv[1];
5861 	} else
5862 		usage_diff();
5863 
5864 	error = got_repo_pack_fds_open(&pack_fds);
5865 	if (error)
5866 		goto done;
5867 
5868 	if (repo_path == NULL) {
5869 		cwd = getcwd(NULL, 0);
5870 		if (cwd == NULL)
5871 			return got_error_from_errno("getcwd");
5872 		error = got_worktree_open(&worktree, cwd);
5873 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5874 			goto done;
5875 		if (worktree)
5876 			repo_path =
5877 			    strdup(got_worktree_get_repo_path(worktree));
5878 		else
5879 			repo_path = strdup(cwd);
5880 		if (repo_path == NULL) {
5881 			error = got_error_from_errno("strdup");
5882 			goto done;
5883 		}
5884 	}
5885 
5886 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5887 	if (error)
5888 		goto done;
5889 
5890 	error = init_curses(&tog_io);
5891 	if (error)
5892 		goto done;
5893 
5894 	error = apply_unveil(got_repo_get_path(repo), NULL);
5895 	if (error)
5896 		goto done;
5897 
5898 	error = tog_load_refs(repo, 0);
5899 	if (error)
5900 		goto done;
5901 
5902 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5903 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5904 	if (error)
5905 		goto done;
5906 
5907 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5908 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5909 	if (error)
5910 		goto done;
5911 
5912 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5913 	if (view == NULL) {
5914 		error = got_error_from_errno("view_open");
5915 		goto done;
5916 	}
5917 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5918 	    ignore_whitespace, force_text_diff, NULL,  repo);
5919 	if (error)
5920 		goto done;
5921 	error = view_loop(view, tog_io);
5922 done:
5923 	free(label1);
5924 	free(label2);
5925 	free(repo_path);
5926 	free(cwd);
5927 	if (repo) {
5928 		const struct got_error *close_err = got_repo_close(repo);
5929 		if (error == NULL)
5930 			error = close_err;
5931 	}
5932 	if (worktree)
5933 		got_worktree_close(worktree);
5934 	if (pack_fds) {
5935 		const struct got_error *pack_err =
5936 		    got_repo_pack_fds_close(pack_fds);
5937 		if (error == NULL)
5938 			error = pack_err;
5939 	}
5940 	if (tog_io != NULL) {
5941 		io_err = tog_io_close(tog_io);
5942 		if (error == NULL)
5943 			error = io_err;
5944 	}
5945 	tog_free_refs();
5946 	return error;
5947 }
5948 
5949 __dead static void
5950 usage_blame(void)
5951 {
5952 	endwin();
5953 	fprintf(stderr,
5954 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5955 	    getprogname());
5956 	exit(1);
5957 }
5958 
5959 struct tog_blame_line {
5960 	int annotated;
5961 	struct got_object_id *id;
5962 };
5963 
5964 static const struct got_error *
5965 draw_blame(struct tog_view *view)
5966 {
5967 	struct tog_blame_view_state *s = &view->state.blame;
5968 	struct tog_blame *blame = &s->blame;
5969 	regmatch_t *regmatch = &view->regmatch;
5970 	const struct got_error *err;
5971 	int lineno = 0, nprinted = 0;
5972 	char *line = NULL;
5973 	size_t linesize = 0;
5974 	ssize_t linelen;
5975 	wchar_t *wline;
5976 	int width;
5977 	struct tog_blame_line *blame_line;
5978 	struct got_object_id *prev_id = NULL;
5979 	char *id_str;
5980 	struct tog_color *tc;
5981 
5982 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5983 	if (err)
5984 		return err;
5985 
5986 	rewind(blame->f);
5987 	werase(view->window);
5988 
5989 	if (asprintf(&line, "commit %s", id_str) == -1) {
5990 		err = got_error_from_errno("asprintf");
5991 		free(id_str);
5992 		return err;
5993 	}
5994 
5995 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5996 	free(line);
5997 	line = NULL;
5998 	if (err)
5999 		return err;
6000 	if (view_needs_focus_indication(view))
6001 		wstandout(view->window);
6002 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6003 	if (tc)
6004 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6005 	waddwstr(view->window, wline);
6006 	while (width++ < view->ncols)
6007 		waddch(view->window, ' ');
6008 	if (tc)
6009 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6010 	if (view_needs_focus_indication(view))
6011 		wstandend(view->window);
6012 	free(wline);
6013 	wline = NULL;
6014 
6015 	if (view->gline > blame->nlines)
6016 		view->gline = blame->nlines;
6017 
6018 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6019 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6020 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6021 		free(id_str);
6022 		return got_error_from_errno("asprintf");
6023 	}
6024 	free(id_str);
6025 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6026 	free(line);
6027 	line = NULL;
6028 	if (err)
6029 		return err;
6030 	waddwstr(view->window, wline);
6031 	free(wline);
6032 	wline = NULL;
6033 	if (width < view->ncols - 1)
6034 		waddch(view->window, '\n');
6035 
6036 	s->eof = 0;
6037 	view->maxx = 0;
6038 	while (nprinted < view->nlines - 2) {
6039 		linelen = getline(&line, &linesize, blame->f);
6040 		if (linelen == -1) {
6041 			if (feof(blame->f)) {
6042 				s->eof = 1;
6043 				break;
6044 			}
6045 			free(line);
6046 			return got_ferror(blame->f, GOT_ERR_IO);
6047 		}
6048 		if (++lineno < s->first_displayed_line)
6049 			continue;
6050 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6051 			continue;
6052 
6053 		/* Set view->maxx based on full line length. */
6054 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6055 		if (err) {
6056 			free(line);
6057 			return err;
6058 		}
6059 		free(wline);
6060 		wline = NULL;
6061 		view->maxx = MAX(view->maxx, width);
6062 
6063 		if (nprinted == s->selected_line - 1)
6064 			wstandout(view->window);
6065 
6066 		if (blame->nlines > 0) {
6067 			blame_line = &blame->lines[lineno - 1];
6068 			if (blame_line->annotated && prev_id &&
6069 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6070 			    !(nprinted == s->selected_line - 1)) {
6071 				waddstr(view->window, "        ");
6072 			} else if (blame_line->annotated) {
6073 				char *id_str;
6074 				err = got_object_id_str(&id_str,
6075 				    blame_line->id);
6076 				if (err) {
6077 					free(line);
6078 					return err;
6079 				}
6080 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6081 				if (tc)
6082 					wattr_on(view->window,
6083 					    COLOR_PAIR(tc->colorpair), NULL);
6084 				wprintw(view->window, "%.8s", id_str);
6085 				if (tc)
6086 					wattr_off(view->window,
6087 					    COLOR_PAIR(tc->colorpair), NULL);
6088 				free(id_str);
6089 				prev_id = blame_line->id;
6090 			} else {
6091 				waddstr(view->window, "........");
6092 				prev_id = NULL;
6093 			}
6094 		} else {
6095 			waddstr(view->window, "........");
6096 			prev_id = NULL;
6097 		}
6098 
6099 		if (nprinted == s->selected_line - 1)
6100 			wstandend(view->window);
6101 		waddstr(view->window, " ");
6102 
6103 		if (view->ncols <= 9) {
6104 			width = 9;
6105 		} else if (s->first_displayed_line + nprinted ==
6106 		    s->matched_line &&
6107 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6108 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6109 			    view->window, view->x, regmatch);
6110 			if (err) {
6111 				free(line);
6112 				return err;
6113 			}
6114 			width += 9;
6115 		} else {
6116 			int skip;
6117 			err = format_line(&wline, &width, &skip, line,
6118 			    view->x, view->ncols - 9, 9, 1);
6119 			if (err) {
6120 				free(line);
6121 				return err;
6122 			}
6123 			waddwstr(view->window, &wline[skip]);
6124 			width += 9;
6125 			free(wline);
6126 			wline = NULL;
6127 		}
6128 
6129 		if (width <= view->ncols - 1)
6130 			waddch(view->window, '\n');
6131 		if (++nprinted == 1)
6132 			s->first_displayed_line = lineno;
6133 	}
6134 	free(line);
6135 	s->last_displayed_line = lineno;
6136 
6137 	view_border(view);
6138 
6139 	return NULL;
6140 }
6141 
6142 static const struct got_error *
6143 blame_cb(void *arg, int nlines, int lineno,
6144     struct got_commit_object *commit, struct got_object_id *id)
6145 {
6146 	const struct got_error *err = NULL;
6147 	struct tog_blame_cb_args *a = arg;
6148 	struct tog_blame_line *line;
6149 	int errcode;
6150 
6151 	if (nlines != a->nlines ||
6152 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6153 		return got_error(GOT_ERR_RANGE);
6154 
6155 	errcode = pthread_mutex_lock(&tog_mutex);
6156 	if (errcode)
6157 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6158 
6159 	if (*a->quit) {	/* user has quit the blame view */
6160 		err = got_error(GOT_ERR_ITER_COMPLETED);
6161 		goto done;
6162 	}
6163 
6164 	if (lineno == -1)
6165 		goto done; /* no change in this commit */
6166 
6167 	line = &a->lines[lineno - 1];
6168 	if (line->annotated)
6169 		goto done;
6170 
6171 	line->id = got_object_id_dup(id);
6172 	if (line->id == NULL) {
6173 		err = got_error_from_errno("got_object_id_dup");
6174 		goto done;
6175 	}
6176 	line->annotated = 1;
6177 done:
6178 	errcode = pthread_mutex_unlock(&tog_mutex);
6179 	if (errcode)
6180 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6181 	return err;
6182 }
6183 
6184 static void *
6185 blame_thread(void *arg)
6186 {
6187 	const struct got_error *err, *close_err;
6188 	struct tog_blame_thread_args *ta = arg;
6189 	struct tog_blame_cb_args *a = ta->cb_args;
6190 	int errcode, fd1 = -1, fd2 = -1;
6191 	FILE *f1 = NULL, *f2 = NULL;
6192 
6193 	fd1 = got_opentempfd();
6194 	if (fd1 == -1)
6195 		return (void *)got_error_from_errno("got_opentempfd");
6196 
6197 	fd2 = got_opentempfd();
6198 	if (fd2 == -1) {
6199 		err = got_error_from_errno("got_opentempfd");
6200 		goto done;
6201 	}
6202 
6203 	f1 = got_opentemp();
6204 	if (f1 == NULL) {
6205 		err = (void *)got_error_from_errno("got_opentemp");
6206 		goto done;
6207 	}
6208 	f2 = got_opentemp();
6209 	if (f2 == NULL) {
6210 		err = (void *)got_error_from_errno("got_opentemp");
6211 		goto done;
6212 	}
6213 
6214 	err = block_signals_used_by_main_thread();
6215 	if (err)
6216 		goto done;
6217 
6218 	err = got_blame(ta->path, a->commit_id, ta->repo,
6219 	    tog_diff_algo, blame_cb, ta->cb_args,
6220 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6221 	if (err && err->code == GOT_ERR_CANCELLED)
6222 		err = NULL;
6223 
6224 	errcode = pthread_mutex_lock(&tog_mutex);
6225 	if (errcode) {
6226 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6227 		goto done;
6228 	}
6229 
6230 	close_err = got_repo_close(ta->repo);
6231 	if (err == NULL)
6232 		err = close_err;
6233 	ta->repo = NULL;
6234 	*ta->complete = 1;
6235 
6236 	errcode = pthread_mutex_unlock(&tog_mutex);
6237 	if (errcode && err == NULL)
6238 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6239 
6240 done:
6241 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6242 		err = got_error_from_errno("close");
6243 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6244 		err = got_error_from_errno("close");
6245 	if (f1 && fclose(f1) == EOF && err == NULL)
6246 		err = got_error_from_errno("fclose");
6247 	if (f2 && fclose(f2) == EOF && err == NULL)
6248 		err = got_error_from_errno("fclose");
6249 
6250 	return (void *)err;
6251 }
6252 
6253 static struct got_object_id *
6254 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6255     int first_displayed_line, int selected_line)
6256 {
6257 	struct tog_blame_line *line;
6258 
6259 	if (nlines <= 0)
6260 		return NULL;
6261 
6262 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6263 	if (!line->annotated)
6264 		return NULL;
6265 
6266 	return line->id;
6267 }
6268 
6269 static struct got_object_id *
6270 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6271     int lineno)
6272 {
6273 	struct tog_blame_line *line;
6274 
6275 	if (nlines <= 0 || lineno >= nlines)
6276 		return NULL;
6277 
6278 	line = &lines[lineno - 1];
6279 	if (!line->annotated)
6280 		return NULL;
6281 
6282 	return line->id;
6283 }
6284 
6285 static const struct got_error *
6286 stop_blame(struct tog_blame *blame)
6287 {
6288 	const struct got_error *err = NULL;
6289 	int i;
6290 
6291 	if (blame->thread) {
6292 		int errcode;
6293 		errcode = pthread_mutex_unlock(&tog_mutex);
6294 		if (errcode)
6295 			return got_error_set_errno(errcode,
6296 			    "pthread_mutex_unlock");
6297 		errcode = pthread_join(blame->thread, (void **)&err);
6298 		if (errcode)
6299 			return got_error_set_errno(errcode, "pthread_join");
6300 		errcode = pthread_mutex_lock(&tog_mutex);
6301 		if (errcode)
6302 			return got_error_set_errno(errcode,
6303 			    "pthread_mutex_lock");
6304 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6305 			err = NULL;
6306 		blame->thread = 0; //NULL;
6307 	}
6308 	if (blame->thread_args.repo) {
6309 		const struct got_error *close_err;
6310 		close_err = got_repo_close(blame->thread_args.repo);
6311 		if (err == NULL)
6312 			err = close_err;
6313 		blame->thread_args.repo = NULL;
6314 	}
6315 	if (blame->f) {
6316 		if (fclose(blame->f) == EOF && err == NULL)
6317 			err = got_error_from_errno("fclose");
6318 		blame->f = NULL;
6319 	}
6320 	if (blame->lines) {
6321 		for (i = 0; i < blame->nlines; i++)
6322 			free(blame->lines[i].id);
6323 		free(blame->lines);
6324 		blame->lines = NULL;
6325 	}
6326 	free(blame->cb_args.commit_id);
6327 	blame->cb_args.commit_id = NULL;
6328 	if (blame->pack_fds) {
6329 		const struct got_error *pack_err =
6330 		    got_repo_pack_fds_close(blame->pack_fds);
6331 		if (err == NULL)
6332 			err = pack_err;
6333 		blame->pack_fds = NULL;
6334 	}
6335 	return err;
6336 }
6337 
6338 static const struct got_error *
6339 cancel_blame_view(void *arg)
6340 {
6341 	const struct got_error *err = NULL;
6342 	int *done = arg;
6343 	int errcode;
6344 
6345 	errcode = pthread_mutex_lock(&tog_mutex);
6346 	if (errcode)
6347 		return got_error_set_errno(errcode,
6348 		    "pthread_mutex_unlock");
6349 
6350 	if (*done)
6351 		err = got_error(GOT_ERR_CANCELLED);
6352 
6353 	errcode = pthread_mutex_unlock(&tog_mutex);
6354 	if (errcode)
6355 		return got_error_set_errno(errcode,
6356 		    "pthread_mutex_lock");
6357 
6358 	return err;
6359 }
6360 
6361 static const struct got_error *
6362 run_blame(struct tog_view *view)
6363 {
6364 	struct tog_blame_view_state *s = &view->state.blame;
6365 	struct tog_blame *blame = &s->blame;
6366 	const struct got_error *err = NULL;
6367 	struct got_commit_object *commit = NULL;
6368 	struct got_blob_object *blob = NULL;
6369 	struct got_repository *thread_repo = NULL;
6370 	struct got_object_id *obj_id = NULL;
6371 	int obj_type, fd = -1;
6372 	int *pack_fds = NULL;
6373 
6374 	err = got_object_open_as_commit(&commit, s->repo,
6375 	    &s->blamed_commit->id);
6376 	if (err)
6377 		return err;
6378 
6379 	fd = got_opentempfd();
6380 	if (fd == -1) {
6381 		err = got_error_from_errno("got_opentempfd");
6382 		goto done;
6383 	}
6384 
6385 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6386 	if (err)
6387 		goto done;
6388 
6389 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6390 	if (err)
6391 		goto done;
6392 
6393 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6394 		err = got_error(GOT_ERR_OBJ_TYPE);
6395 		goto done;
6396 	}
6397 
6398 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6399 	if (err)
6400 		goto done;
6401 	blame->f = got_opentemp();
6402 	if (blame->f == NULL) {
6403 		err = got_error_from_errno("got_opentemp");
6404 		goto done;
6405 	}
6406 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6407 	    &blame->line_offsets, blame->f, blob);
6408 	if (err)
6409 		goto done;
6410 	if (blame->nlines == 0) {
6411 		s->blame_complete = 1;
6412 		goto done;
6413 	}
6414 
6415 	/* Don't include \n at EOF in the blame line count. */
6416 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6417 		blame->nlines--;
6418 
6419 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6420 	if (blame->lines == NULL) {
6421 		err = got_error_from_errno("calloc");
6422 		goto done;
6423 	}
6424 
6425 	err = got_repo_pack_fds_open(&pack_fds);
6426 	if (err)
6427 		goto done;
6428 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6429 	    pack_fds);
6430 	if (err)
6431 		goto done;
6432 
6433 	blame->pack_fds = pack_fds;
6434 	blame->cb_args.view = view;
6435 	blame->cb_args.lines = blame->lines;
6436 	blame->cb_args.nlines = blame->nlines;
6437 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6438 	if (blame->cb_args.commit_id == NULL) {
6439 		err = got_error_from_errno("got_object_id_dup");
6440 		goto done;
6441 	}
6442 	blame->cb_args.quit = &s->done;
6443 
6444 	blame->thread_args.path = s->path;
6445 	blame->thread_args.repo = thread_repo;
6446 	blame->thread_args.cb_args = &blame->cb_args;
6447 	blame->thread_args.complete = &s->blame_complete;
6448 	blame->thread_args.cancel_cb = cancel_blame_view;
6449 	blame->thread_args.cancel_arg = &s->done;
6450 	s->blame_complete = 0;
6451 
6452 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6453 		s->first_displayed_line = 1;
6454 		s->last_displayed_line = view->nlines;
6455 		s->selected_line = 1;
6456 	}
6457 	s->matched_line = 0;
6458 
6459 done:
6460 	if (commit)
6461 		got_object_commit_close(commit);
6462 	if (fd != -1 && close(fd) == -1 && err == NULL)
6463 		err = got_error_from_errno("close");
6464 	if (blob)
6465 		got_object_blob_close(blob);
6466 	free(obj_id);
6467 	if (err)
6468 		stop_blame(blame);
6469 	return err;
6470 }
6471 
6472 static const struct got_error *
6473 open_blame_view(struct tog_view *view, char *path,
6474     struct got_object_id *commit_id, struct got_repository *repo)
6475 {
6476 	const struct got_error *err = NULL;
6477 	struct tog_blame_view_state *s = &view->state.blame;
6478 
6479 	STAILQ_INIT(&s->blamed_commits);
6480 
6481 	s->path = strdup(path);
6482 	if (s->path == NULL)
6483 		return got_error_from_errno("strdup");
6484 
6485 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6486 	if (err) {
6487 		free(s->path);
6488 		return err;
6489 	}
6490 
6491 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6492 	s->first_displayed_line = 1;
6493 	s->last_displayed_line = view->nlines;
6494 	s->selected_line = 1;
6495 	s->blame_complete = 0;
6496 	s->repo = repo;
6497 	s->commit_id = commit_id;
6498 	memset(&s->blame, 0, sizeof(s->blame));
6499 
6500 	STAILQ_INIT(&s->colors);
6501 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6502 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6503 		    get_color_value("TOG_COLOR_COMMIT"));
6504 		if (err)
6505 			return err;
6506 	}
6507 
6508 	view->show = show_blame_view;
6509 	view->input = input_blame_view;
6510 	view->reset = reset_blame_view;
6511 	view->close = close_blame_view;
6512 	view->search_start = search_start_blame_view;
6513 	view->search_setup = search_setup_blame_view;
6514 	view->search_next = search_next_view_match;
6515 
6516 	return run_blame(view);
6517 }
6518 
6519 static const struct got_error *
6520 close_blame_view(struct tog_view *view)
6521 {
6522 	const struct got_error *err = NULL;
6523 	struct tog_blame_view_state *s = &view->state.blame;
6524 
6525 	if (s->blame.thread)
6526 		err = stop_blame(&s->blame);
6527 
6528 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6529 		struct got_object_qid *blamed_commit;
6530 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6531 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6532 		got_object_qid_free(blamed_commit);
6533 	}
6534 
6535 	free(s->path);
6536 	free_colors(&s->colors);
6537 	return err;
6538 }
6539 
6540 static const struct got_error *
6541 search_start_blame_view(struct tog_view *view)
6542 {
6543 	struct tog_blame_view_state *s = &view->state.blame;
6544 
6545 	s->matched_line = 0;
6546 	return NULL;
6547 }
6548 
6549 static void
6550 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6551     size_t *nlines, int **first, int **last, int **match, int **selected)
6552 {
6553 	struct tog_blame_view_state *s = &view->state.blame;
6554 
6555 	*f = s->blame.f;
6556 	*nlines = s->blame.nlines;
6557 	*line_offsets = s->blame.line_offsets;
6558 	*match = &s->matched_line;
6559 	*first = &s->first_displayed_line;
6560 	*last = &s->last_displayed_line;
6561 	*selected = &s->selected_line;
6562 }
6563 
6564 static const struct got_error *
6565 show_blame_view(struct tog_view *view)
6566 {
6567 	const struct got_error *err = NULL;
6568 	struct tog_blame_view_state *s = &view->state.blame;
6569 	int errcode;
6570 
6571 	if (s->blame.thread == 0 && !s->blame_complete) {
6572 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6573 		    &s->blame.thread_args);
6574 		if (errcode)
6575 			return got_error_set_errno(errcode, "pthread_create");
6576 
6577 		halfdelay(1); /* fast refresh while annotating  */
6578 	}
6579 
6580 	if (s->blame_complete)
6581 		halfdelay(10); /* disable fast refresh */
6582 
6583 	err = draw_blame(view);
6584 
6585 	view_border(view);
6586 	return err;
6587 }
6588 
6589 static const struct got_error *
6590 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6591     struct got_repository *repo, struct got_object_id *id)
6592 {
6593 	struct tog_view		*log_view;
6594 	const struct got_error	*err = NULL;
6595 
6596 	*new_view = NULL;
6597 
6598 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6599 	if (log_view == NULL)
6600 		return got_error_from_errno("view_open");
6601 
6602 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6603 	if (err)
6604 		view_close(log_view);
6605 	else
6606 		*new_view = log_view;
6607 
6608 	return err;
6609 }
6610 
6611 static const struct got_error *
6612 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6613 {
6614 	const struct got_error *err = NULL, *thread_err = NULL;
6615 	struct tog_view *diff_view;
6616 	struct tog_blame_view_state *s = &view->state.blame;
6617 	int eos, nscroll, begin_y = 0, begin_x = 0;
6618 
6619 	eos = nscroll = view->nlines - 2;
6620 	if (view_is_hsplit_top(view))
6621 		--eos;  /* border */
6622 
6623 	switch (ch) {
6624 	case '0':
6625 	case '$':
6626 	case KEY_RIGHT:
6627 	case 'l':
6628 	case KEY_LEFT:
6629 	case 'h':
6630 		horizontal_scroll_input(view, ch);
6631 		break;
6632 	case 'q':
6633 		s->done = 1;
6634 		break;
6635 	case 'g':
6636 	case KEY_HOME:
6637 		s->selected_line = 1;
6638 		s->first_displayed_line = 1;
6639 		view->count = 0;
6640 		break;
6641 	case 'G':
6642 	case KEY_END:
6643 		if (s->blame.nlines < eos) {
6644 			s->selected_line = s->blame.nlines;
6645 			s->first_displayed_line = 1;
6646 		} else {
6647 			s->selected_line = eos;
6648 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6649 		}
6650 		view->count = 0;
6651 		break;
6652 	case 'k':
6653 	case KEY_UP:
6654 	case CTRL('p'):
6655 		if (s->selected_line > 1)
6656 			s->selected_line--;
6657 		else if (s->selected_line == 1 &&
6658 		    s->first_displayed_line > 1)
6659 			s->first_displayed_line--;
6660 		else
6661 			view->count = 0;
6662 		break;
6663 	case CTRL('u'):
6664 	case 'u':
6665 		nscroll /= 2;
6666 		/* FALL THROUGH */
6667 	case KEY_PPAGE:
6668 	case CTRL('b'):
6669 	case 'b':
6670 		if (s->first_displayed_line == 1) {
6671 			if (view->count > 1)
6672 				nscroll += nscroll;
6673 			s->selected_line = MAX(1, s->selected_line - nscroll);
6674 			view->count = 0;
6675 			break;
6676 		}
6677 		if (s->first_displayed_line > nscroll)
6678 			s->first_displayed_line -= nscroll;
6679 		else
6680 			s->first_displayed_line = 1;
6681 		break;
6682 	case 'j':
6683 	case KEY_DOWN:
6684 	case CTRL('n'):
6685 		if (s->selected_line < eos && s->first_displayed_line +
6686 		    s->selected_line <= s->blame.nlines)
6687 			s->selected_line++;
6688 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6689 			s->first_displayed_line++;
6690 		else
6691 			view->count = 0;
6692 		break;
6693 	case 'c':
6694 	case 'p': {
6695 		struct got_object_id *id = NULL;
6696 
6697 		view->count = 0;
6698 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6699 		    s->first_displayed_line, s->selected_line);
6700 		if (id == NULL)
6701 			break;
6702 		if (ch == 'p') {
6703 			struct got_commit_object *commit, *pcommit;
6704 			struct got_object_qid *pid;
6705 			struct got_object_id *blob_id = NULL;
6706 			int obj_type;
6707 			err = got_object_open_as_commit(&commit,
6708 			    s->repo, id);
6709 			if (err)
6710 				break;
6711 			pid = STAILQ_FIRST(
6712 			    got_object_commit_get_parent_ids(commit));
6713 			if (pid == NULL) {
6714 				got_object_commit_close(commit);
6715 				break;
6716 			}
6717 			/* Check if path history ends here. */
6718 			err = got_object_open_as_commit(&pcommit,
6719 			    s->repo, &pid->id);
6720 			if (err)
6721 				break;
6722 			err = got_object_id_by_path(&blob_id, s->repo,
6723 			    pcommit, s->path);
6724 			got_object_commit_close(pcommit);
6725 			if (err) {
6726 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6727 					err = NULL;
6728 				got_object_commit_close(commit);
6729 				break;
6730 			}
6731 			err = got_object_get_type(&obj_type, s->repo,
6732 			    blob_id);
6733 			free(blob_id);
6734 			/* Can't blame non-blob type objects. */
6735 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6736 				got_object_commit_close(commit);
6737 				break;
6738 			}
6739 			err = got_object_qid_alloc(&s->blamed_commit,
6740 			    &pid->id);
6741 			got_object_commit_close(commit);
6742 		} else {
6743 			if (got_object_id_cmp(id,
6744 			    &s->blamed_commit->id) == 0)
6745 				break;
6746 			err = got_object_qid_alloc(&s->blamed_commit,
6747 			    id);
6748 		}
6749 		if (err)
6750 			break;
6751 		s->done = 1;
6752 		thread_err = stop_blame(&s->blame);
6753 		s->done = 0;
6754 		if (thread_err)
6755 			break;
6756 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6757 		    s->blamed_commit, entry);
6758 		err = run_blame(view);
6759 		if (err)
6760 			break;
6761 		break;
6762 	}
6763 	case 'C': {
6764 		struct got_object_qid *first;
6765 
6766 		view->count = 0;
6767 		first = STAILQ_FIRST(&s->blamed_commits);
6768 		if (!got_object_id_cmp(&first->id, s->commit_id))
6769 			break;
6770 		s->done = 1;
6771 		thread_err = stop_blame(&s->blame);
6772 		s->done = 0;
6773 		if (thread_err)
6774 			break;
6775 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6776 		got_object_qid_free(s->blamed_commit);
6777 		s->blamed_commit =
6778 		    STAILQ_FIRST(&s->blamed_commits);
6779 		err = run_blame(view);
6780 		if (err)
6781 			break;
6782 		break;
6783 	}
6784 	case 'L':
6785 		view->count = 0;
6786 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6787 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6788 		if (s->id_to_log)
6789 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6790 		break;
6791 	case KEY_ENTER:
6792 	case '\r': {
6793 		struct got_object_id *id = NULL;
6794 		struct got_object_qid *pid;
6795 		struct got_commit_object *commit = NULL;
6796 
6797 		view->count = 0;
6798 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6799 		    s->first_displayed_line, s->selected_line);
6800 		if (id == NULL)
6801 			break;
6802 		err = got_object_open_as_commit(&commit, s->repo, id);
6803 		if (err)
6804 			break;
6805 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6806 		if (*new_view) {
6807 			/* traversed from diff view, release diff resources  */
6808 			err = close_diff_view(*new_view);
6809 			if (err)
6810 				break;
6811 			diff_view = *new_view;
6812 		} else {
6813 			if (view_is_parent_view(view))
6814 				view_get_split(view, &begin_y, &begin_x);
6815 
6816 			diff_view = view_open(0, 0, begin_y, begin_x,
6817 			    TOG_VIEW_DIFF);
6818 			if (diff_view == NULL) {
6819 				got_object_commit_close(commit);
6820 				err = got_error_from_errno("view_open");
6821 				break;
6822 			}
6823 		}
6824 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6825 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6826 		got_object_commit_close(commit);
6827 		if (err) {
6828 			view_close(diff_view);
6829 			break;
6830 		}
6831 		s->last_diffed_line = s->first_displayed_line - 1 +
6832 		    s->selected_line;
6833 		if (*new_view)
6834 			break;	/* still open from active diff view */
6835 		if (view_is_parent_view(view) &&
6836 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6837 			err = view_init_hsplit(view, begin_y);
6838 			if (err)
6839 				break;
6840 		}
6841 
6842 		view->focussed = 0;
6843 		diff_view->focussed = 1;
6844 		diff_view->mode = view->mode;
6845 		diff_view->nlines = view->lines - begin_y;
6846 		if (view_is_parent_view(view)) {
6847 			view_transfer_size(diff_view, view);
6848 			err = view_close_child(view);
6849 			if (err)
6850 				break;
6851 			err = view_set_child(view, diff_view);
6852 			if (err)
6853 				break;
6854 			view->focus_child = 1;
6855 		} else
6856 			*new_view = diff_view;
6857 		if (err)
6858 			break;
6859 		break;
6860 	}
6861 	case CTRL('d'):
6862 	case 'd':
6863 		nscroll /= 2;
6864 		/* FALL THROUGH */
6865 	case KEY_NPAGE:
6866 	case CTRL('f'):
6867 	case 'f':
6868 	case ' ':
6869 		if (s->last_displayed_line >= s->blame.nlines &&
6870 		    s->selected_line >= MIN(s->blame.nlines,
6871 		    view->nlines - 2)) {
6872 			view->count = 0;
6873 			break;
6874 		}
6875 		if (s->last_displayed_line >= s->blame.nlines &&
6876 		    s->selected_line < view->nlines - 2) {
6877 			s->selected_line +=
6878 			    MIN(nscroll, s->last_displayed_line -
6879 			    s->first_displayed_line - s->selected_line + 1);
6880 		}
6881 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6882 			s->first_displayed_line += nscroll;
6883 		else
6884 			s->first_displayed_line =
6885 			    s->blame.nlines - (view->nlines - 3);
6886 		break;
6887 	case KEY_RESIZE:
6888 		if (s->selected_line > view->nlines - 2) {
6889 			s->selected_line = MIN(s->blame.nlines,
6890 			    view->nlines - 2);
6891 		}
6892 		break;
6893 	default:
6894 		view->count = 0;
6895 		break;
6896 	}
6897 	return thread_err ? thread_err : err;
6898 }
6899 
6900 static const struct got_error *
6901 reset_blame_view(struct tog_view *view)
6902 {
6903 	const struct got_error *err;
6904 	struct tog_blame_view_state *s = &view->state.blame;
6905 
6906 	view->count = 0;
6907 	s->done = 1;
6908 	err = stop_blame(&s->blame);
6909 	s->done = 0;
6910 	if (err)
6911 		return err;
6912 	return run_blame(view);
6913 }
6914 
6915 static const struct got_error *
6916 cmd_blame(int argc, char *argv[])
6917 {
6918 	const struct got_error *io_err, *error;
6919 	struct got_repository *repo = NULL;
6920 	struct got_worktree *worktree = NULL;
6921 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6922 	char *link_target = NULL;
6923 	struct got_object_id *commit_id = NULL;
6924 	struct got_commit_object *commit = NULL;
6925 	char *commit_id_str = NULL;
6926 	int ch;
6927 	struct tog_view *view;
6928 	struct tog_io *tog_io = NULL;
6929 	int *pack_fds = NULL;
6930 
6931 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6932 		switch (ch) {
6933 		case 'c':
6934 			commit_id_str = optarg;
6935 			break;
6936 		case 'r':
6937 			repo_path = realpath(optarg, NULL);
6938 			if (repo_path == NULL)
6939 				return got_error_from_errno2("realpath",
6940 				    optarg);
6941 			break;
6942 		default:
6943 			usage_blame();
6944 			/* NOTREACHED */
6945 		}
6946 	}
6947 
6948 	argc -= optind;
6949 	argv += optind;
6950 
6951 	if (argc != 1)
6952 		usage_blame();
6953 
6954 	error = got_repo_pack_fds_open(&pack_fds);
6955 	if (error != NULL)
6956 		goto done;
6957 
6958 	if (repo_path == NULL) {
6959 		cwd = getcwd(NULL, 0);
6960 		if (cwd == NULL)
6961 			return got_error_from_errno("getcwd");
6962 		error = got_worktree_open(&worktree, cwd);
6963 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6964 			goto done;
6965 		if (worktree)
6966 			repo_path =
6967 			    strdup(got_worktree_get_repo_path(worktree));
6968 		else
6969 			repo_path = strdup(cwd);
6970 		if (repo_path == NULL) {
6971 			error = got_error_from_errno("strdup");
6972 			goto done;
6973 		}
6974 	}
6975 
6976 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6977 	if (error != NULL)
6978 		goto done;
6979 
6980 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6981 	    worktree);
6982 	if (error)
6983 		goto done;
6984 
6985 	error = init_curses(&tog_io);
6986 	if (error)
6987 		goto done;
6988 
6989 	error = apply_unveil(got_repo_get_path(repo), NULL);
6990 	if (error)
6991 		goto done;
6992 
6993 	error = tog_load_refs(repo, 0);
6994 	if (error)
6995 		goto done;
6996 
6997 	if (commit_id_str == NULL) {
6998 		struct got_reference *head_ref;
6999 		error = got_ref_open(&head_ref, repo, worktree ?
7000 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7001 		if (error != NULL)
7002 			goto done;
7003 		error = got_ref_resolve(&commit_id, repo, head_ref);
7004 		got_ref_close(head_ref);
7005 	} else {
7006 		error = got_repo_match_object_id(&commit_id, NULL,
7007 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7008 	}
7009 	if (error != NULL)
7010 		goto done;
7011 
7012 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7013 	if (view == NULL) {
7014 		error = got_error_from_errno("view_open");
7015 		goto done;
7016 	}
7017 
7018 	error = got_object_open_as_commit(&commit, repo, commit_id);
7019 	if (error)
7020 		goto done;
7021 
7022 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7023 	    commit, repo);
7024 	if (error)
7025 		goto done;
7026 
7027 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7028 	    commit_id, repo);
7029 	if (error)
7030 		goto done;
7031 	if (worktree) {
7032 		/* Release work tree lock. */
7033 		got_worktree_close(worktree);
7034 		worktree = NULL;
7035 	}
7036 	error = view_loop(view, tog_io);
7037 done:
7038 	free(repo_path);
7039 	free(in_repo_path);
7040 	free(link_target);
7041 	free(cwd);
7042 	free(commit_id);
7043 	if (commit)
7044 		got_object_commit_close(commit);
7045 	if (worktree)
7046 		got_worktree_close(worktree);
7047 	if (repo) {
7048 		const struct got_error *close_err = got_repo_close(repo);
7049 		if (error == NULL)
7050 			error = close_err;
7051 	}
7052 	if (pack_fds) {
7053 		const struct got_error *pack_err =
7054 		    got_repo_pack_fds_close(pack_fds);
7055 		if (error == NULL)
7056 			error = pack_err;
7057 	}
7058 	if (tog_io != NULL) {
7059 		io_err = tog_io_close(tog_io);
7060 		if (error == NULL)
7061 			error = io_err;
7062 	}
7063 	tog_free_refs();
7064 	return error;
7065 }
7066 
7067 static const struct got_error *
7068 draw_tree_entries(struct tog_view *view, const char *parent_path)
7069 {
7070 	struct tog_tree_view_state *s = &view->state.tree;
7071 	const struct got_error *err = NULL;
7072 	struct got_tree_entry *te;
7073 	wchar_t *wline;
7074 	char *index = NULL;
7075 	struct tog_color *tc;
7076 	int width, n, nentries, scrollx, i = 1;
7077 	int limit = view->nlines;
7078 
7079 	s->ndisplayed = 0;
7080 	if (view_is_hsplit_top(view))
7081 		--limit;  /* border */
7082 
7083 	werase(view->window);
7084 
7085 	if (limit == 0)
7086 		return NULL;
7087 
7088 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7089 	    0, 0);
7090 	if (err)
7091 		return err;
7092 	if (view_needs_focus_indication(view))
7093 		wstandout(view->window);
7094 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7095 	if (tc)
7096 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7097 	waddwstr(view->window, wline);
7098 	free(wline);
7099 	wline = NULL;
7100 	while (width++ < view->ncols)
7101 		waddch(view->window, ' ');
7102 	if (tc)
7103 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7104 	if (view_needs_focus_indication(view))
7105 		wstandend(view->window);
7106 	if (--limit <= 0)
7107 		return NULL;
7108 
7109 	i += s->selected;
7110 	if (s->first_displayed_entry) {
7111 		i += got_tree_entry_get_index(s->first_displayed_entry);
7112 		if (s->tree != s->root)
7113 			++i;  /* account for ".." entry */
7114 	}
7115 	nentries = got_object_tree_get_nentries(s->tree);
7116 	if (asprintf(&index, "[%d/%d] %s",
7117 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7118 		return got_error_from_errno("asprintf");
7119 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7120 	free(index);
7121 	if (err)
7122 		return err;
7123 	waddwstr(view->window, wline);
7124 	free(wline);
7125 	wline = NULL;
7126 	if (width < view->ncols - 1)
7127 		waddch(view->window, '\n');
7128 	if (--limit <= 0)
7129 		return NULL;
7130 	waddch(view->window, '\n');
7131 	if (--limit <= 0)
7132 		return NULL;
7133 
7134 	if (s->first_displayed_entry == NULL) {
7135 		te = got_object_tree_get_first_entry(s->tree);
7136 		if (s->selected == 0) {
7137 			if (view->focussed)
7138 				wstandout(view->window);
7139 			s->selected_entry = NULL;
7140 		}
7141 		waddstr(view->window, "  ..\n");	/* parent directory */
7142 		if (s->selected == 0 && view->focussed)
7143 			wstandend(view->window);
7144 		s->ndisplayed++;
7145 		if (--limit <= 0)
7146 			return NULL;
7147 		n = 1;
7148 	} else {
7149 		n = 0;
7150 		te = s->first_displayed_entry;
7151 	}
7152 
7153 	view->maxx = 0;
7154 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7155 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7156 		const char *modestr = "";
7157 		mode_t mode;
7158 
7159 		te = got_object_tree_get_entry(s->tree, i);
7160 		mode = got_tree_entry_get_mode(te);
7161 
7162 		if (s->show_ids) {
7163 			err = got_object_id_str(&id_str,
7164 			    got_tree_entry_get_id(te));
7165 			if (err)
7166 				return got_error_from_errno(
7167 				    "got_object_id_str");
7168 		}
7169 		if (got_object_tree_entry_is_submodule(te))
7170 			modestr = "$";
7171 		else if (S_ISLNK(mode)) {
7172 			int i;
7173 
7174 			err = got_tree_entry_get_symlink_target(&link_target,
7175 			    te, s->repo);
7176 			if (err) {
7177 				free(id_str);
7178 				return err;
7179 			}
7180 			for (i = 0; i < strlen(link_target); i++) {
7181 				if (!isprint((unsigned char)link_target[i]))
7182 					link_target[i] = '?';
7183 			}
7184 			modestr = "@";
7185 		}
7186 		else if (S_ISDIR(mode))
7187 			modestr = "/";
7188 		else if (mode & S_IXUSR)
7189 			modestr = "*";
7190 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7191 		    got_tree_entry_get_name(te), modestr,
7192 		    link_target ? " -> ": "",
7193 		    link_target ? link_target : "") == -1) {
7194 			free(id_str);
7195 			free(link_target);
7196 			return got_error_from_errno("asprintf");
7197 		}
7198 		free(id_str);
7199 		free(link_target);
7200 
7201 		/* use full line width to determine view->maxx */
7202 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7203 		if (err) {
7204 			free(line);
7205 			break;
7206 		}
7207 		view->maxx = MAX(view->maxx, width);
7208 		free(wline);
7209 		wline = NULL;
7210 
7211 		err = format_line(&wline, &width, &scrollx, line, view->x,
7212 		    view->ncols, 0, 0);
7213 		if (err) {
7214 			free(line);
7215 			break;
7216 		}
7217 		if (n == s->selected) {
7218 			if (view->focussed)
7219 				wstandout(view->window);
7220 			s->selected_entry = te;
7221 		}
7222 		tc = match_color(&s->colors, line);
7223 		if (tc)
7224 			wattr_on(view->window,
7225 			    COLOR_PAIR(tc->colorpair), NULL);
7226 		waddwstr(view->window, &wline[scrollx]);
7227 		if (tc)
7228 			wattr_off(view->window,
7229 			    COLOR_PAIR(tc->colorpair), NULL);
7230 		if (width < view->ncols)
7231 			waddch(view->window, '\n');
7232 		if (n == s->selected && view->focussed)
7233 			wstandend(view->window);
7234 		free(line);
7235 		free(wline);
7236 		wline = NULL;
7237 		n++;
7238 		s->ndisplayed++;
7239 		s->last_displayed_entry = te;
7240 		if (--limit <= 0)
7241 			break;
7242 	}
7243 
7244 	return err;
7245 }
7246 
7247 static void
7248 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7249 {
7250 	struct got_tree_entry *te;
7251 	int isroot = s->tree == s->root;
7252 	int i = 0;
7253 
7254 	if (s->first_displayed_entry == NULL)
7255 		return;
7256 
7257 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7258 	while (i++ < maxscroll) {
7259 		if (te == NULL) {
7260 			if (!isroot)
7261 				s->first_displayed_entry = NULL;
7262 			break;
7263 		}
7264 		s->first_displayed_entry = te;
7265 		te = got_tree_entry_get_prev(s->tree, te);
7266 	}
7267 }
7268 
7269 static const struct got_error *
7270 tree_scroll_down(struct tog_view *view, int maxscroll)
7271 {
7272 	struct tog_tree_view_state *s = &view->state.tree;
7273 	struct got_tree_entry *next, *last;
7274 	int n = 0;
7275 
7276 	if (s->first_displayed_entry)
7277 		next = got_tree_entry_get_next(s->tree,
7278 		    s->first_displayed_entry);
7279 	else
7280 		next = got_object_tree_get_first_entry(s->tree);
7281 
7282 	last = s->last_displayed_entry;
7283 	while (next && n++ < maxscroll) {
7284 		if (last) {
7285 			s->last_displayed_entry = last;
7286 			last = got_tree_entry_get_next(s->tree, last);
7287 		}
7288 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7289 			s->first_displayed_entry = next;
7290 			next = got_tree_entry_get_next(s->tree, next);
7291 		}
7292 	}
7293 
7294 	return NULL;
7295 }
7296 
7297 static const struct got_error *
7298 tree_entry_path(char **path, struct tog_parent_trees *parents,
7299     struct got_tree_entry *te)
7300 {
7301 	const struct got_error *err = NULL;
7302 	struct tog_parent_tree *pt;
7303 	size_t len = 2; /* for leading slash and NUL */
7304 
7305 	TAILQ_FOREACH(pt, parents, entry)
7306 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7307 		    + 1 /* slash */;
7308 	if (te)
7309 		len += strlen(got_tree_entry_get_name(te));
7310 
7311 	*path = calloc(1, len);
7312 	if (path == NULL)
7313 		return got_error_from_errno("calloc");
7314 
7315 	(*path)[0] = '/';
7316 	pt = TAILQ_LAST(parents, tog_parent_trees);
7317 	while (pt) {
7318 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7319 		if (strlcat(*path, name, len) >= len) {
7320 			err = got_error(GOT_ERR_NO_SPACE);
7321 			goto done;
7322 		}
7323 		if (strlcat(*path, "/", len) >= len) {
7324 			err = got_error(GOT_ERR_NO_SPACE);
7325 			goto done;
7326 		}
7327 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7328 	}
7329 	if (te) {
7330 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7331 			err = got_error(GOT_ERR_NO_SPACE);
7332 			goto done;
7333 		}
7334 	}
7335 done:
7336 	if (err) {
7337 		free(*path);
7338 		*path = NULL;
7339 	}
7340 	return err;
7341 }
7342 
7343 static const struct got_error *
7344 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7345     struct got_tree_entry *te, struct tog_parent_trees *parents,
7346     struct got_object_id *commit_id, struct got_repository *repo)
7347 {
7348 	const struct got_error *err = NULL;
7349 	char *path;
7350 	struct tog_view *blame_view;
7351 
7352 	*new_view = NULL;
7353 
7354 	err = tree_entry_path(&path, parents, te);
7355 	if (err)
7356 		return err;
7357 
7358 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7359 	if (blame_view == NULL) {
7360 		err = got_error_from_errno("view_open");
7361 		goto done;
7362 	}
7363 
7364 	err = open_blame_view(blame_view, path, commit_id, repo);
7365 	if (err) {
7366 		if (err->code == GOT_ERR_CANCELLED)
7367 			err = NULL;
7368 		view_close(blame_view);
7369 	} else
7370 		*new_view = blame_view;
7371 done:
7372 	free(path);
7373 	return err;
7374 }
7375 
7376 static const struct got_error *
7377 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7378     struct tog_tree_view_state *s)
7379 {
7380 	struct tog_view *log_view;
7381 	const struct got_error *err = NULL;
7382 	char *path;
7383 
7384 	*new_view = NULL;
7385 
7386 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7387 	if (log_view == NULL)
7388 		return got_error_from_errno("view_open");
7389 
7390 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7391 	if (err)
7392 		return err;
7393 
7394 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7395 	    path, 0);
7396 	if (err)
7397 		view_close(log_view);
7398 	else
7399 		*new_view = log_view;
7400 	free(path);
7401 	return err;
7402 }
7403 
7404 static const struct got_error *
7405 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7406     const char *head_ref_name, struct got_repository *repo)
7407 {
7408 	const struct got_error *err = NULL;
7409 	char *commit_id_str = NULL;
7410 	struct tog_tree_view_state *s = &view->state.tree;
7411 	struct got_commit_object *commit = NULL;
7412 
7413 	TAILQ_INIT(&s->parents);
7414 	STAILQ_INIT(&s->colors);
7415 
7416 	s->commit_id = got_object_id_dup(commit_id);
7417 	if (s->commit_id == NULL)
7418 		return got_error_from_errno("got_object_id_dup");
7419 
7420 	err = got_object_open_as_commit(&commit, repo, commit_id);
7421 	if (err)
7422 		goto done;
7423 
7424 	/*
7425 	 * The root is opened here and will be closed when the view is closed.
7426 	 * Any visited subtrees and their path-wise parents are opened and
7427 	 * closed on demand.
7428 	 */
7429 	err = got_object_open_as_tree(&s->root, repo,
7430 	    got_object_commit_get_tree_id(commit));
7431 	if (err)
7432 		goto done;
7433 	s->tree = s->root;
7434 
7435 	err = got_object_id_str(&commit_id_str, commit_id);
7436 	if (err != NULL)
7437 		goto done;
7438 
7439 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7440 		err = got_error_from_errno("asprintf");
7441 		goto done;
7442 	}
7443 
7444 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7445 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7446 	if (head_ref_name) {
7447 		s->head_ref_name = strdup(head_ref_name);
7448 		if (s->head_ref_name == NULL) {
7449 			err = got_error_from_errno("strdup");
7450 			goto done;
7451 		}
7452 	}
7453 	s->repo = repo;
7454 
7455 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7456 		err = add_color(&s->colors, "\\$$",
7457 		    TOG_COLOR_TREE_SUBMODULE,
7458 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7459 		if (err)
7460 			goto done;
7461 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7462 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7463 		if (err)
7464 			goto done;
7465 		err = add_color(&s->colors, "/$",
7466 		    TOG_COLOR_TREE_DIRECTORY,
7467 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7468 		if (err)
7469 			goto done;
7470 
7471 		err = add_color(&s->colors, "\\*$",
7472 		    TOG_COLOR_TREE_EXECUTABLE,
7473 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7474 		if (err)
7475 			goto done;
7476 
7477 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7478 		    get_color_value("TOG_COLOR_COMMIT"));
7479 		if (err)
7480 			goto done;
7481 	}
7482 
7483 	view->show = show_tree_view;
7484 	view->input = input_tree_view;
7485 	view->close = close_tree_view;
7486 	view->search_start = search_start_tree_view;
7487 	view->search_next = search_next_tree_view;
7488 done:
7489 	free(commit_id_str);
7490 	if (commit)
7491 		got_object_commit_close(commit);
7492 	if (err)
7493 		close_tree_view(view);
7494 	return err;
7495 }
7496 
7497 static const struct got_error *
7498 close_tree_view(struct tog_view *view)
7499 {
7500 	struct tog_tree_view_state *s = &view->state.tree;
7501 
7502 	free_colors(&s->colors);
7503 	free(s->tree_label);
7504 	s->tree_label = NULL;
7505 	free(s->commit_id);
7506 	s->commit_id = NULL;
7507 	free(s->head_ref_name);
7508 	s->head_ref_name = NULL;
7509 	while (!TAILQ_EMPTY(&s->parents)) {
7510 		struct tog_parent_tree *parent;
7511 		parent = TAILQ_FIRST(&s->parents);
7512 		TAILQ_REMOVE(&s->parents, parent, entry);
7513 		if (parent->tree != s->root)
7514 			got_object_tree_close(parent->tree);
7515 		free(parent);
7516 
7517 	}
7518 	if (s->tree != NULL && s->tree != s->root)
7519 		got_object_tree_close(s->tree);
7520 	if (s->root)
7521 		got_object_tree_close(s->root);
7522 	return NULL;
7523 }
7524 
7525 static const struct got_error *
7526 search_start_tree_view(struct tog_view *view)
7527 {
7528 	struct tog_tree_view_state *s = &view->state.tree;
7529 
7530 	s->matched_entry = NULL;
7531 	return NULL;
7532 }
7533 
7534 static int
7535 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7536 {
7537 	regmatch_t regmatch;
7538 
7539 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7540 	    0) == 0;
7541 }
7542 
7543 static const struct got_error *
7544 search_next_tree_view(struct tog_view *view)
7545 {
7546 	struct tog_tree_view_state *s = &view->state.tree;
7547 	struct got_tree_entry *te = NULL;
7548 
7549 	if (!view->searching) {
7550 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7551 		return NULL;
7552 	}
7553 
7554 	if (s->matched_entry) {
7555 		if (view->searching == TOG_SEARCH_FORWARD) {
7556 			if (s->selected_entry)
7557 				te = got_tree_entry_get_next(s->tree,
7558 				    s->selected_entry);
7559 			else
7560 				te = got_object_tree_get_first_entry(s->tree);
7561 		} else {
7562 			if (s->selected_entry == NULL)
7563 				te = got_object_tree_get_last_entry(s->tree);
7564 			else
7565 				te = got_tree_entry_get_prev(s->tree,
7566 				    s->selected_entry);
7567 		}
7568 	} else {
7569 		if (s->selected_entry)
7570 			te = s->selected_entry;
7571 		else if (view->searching == TOG_SEARCH_FORWARD)
7572 			te = got_object_tree_get_first_entry(s->tree);
7573 		else
7574 			te = got_object_tree_get_last_entry(s->tree);
7575 	}
7576 
7577 	while (1) {
7578 		if (te == NULL) {
7579 			if (s->matched_entry == NULL) {
7580 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7581 				return NULL;
7582 			}
7583 			if (view->searching == TOG_SEARCH_FORWARD)
7584 				te = got_object_tree_get_first_entry(s->tree);
7585 			else
7586 				te = got_object_tree_get_last_entry(s->tree);
7587 		}
7588 
7589 		if (match_tree_entry(te, &view->regex)) {
7590 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7591 			s->matched_entry = te;
7592 			break;
7593 		}
7594 
7595 		if (view->searching == TOG_SEARCH_FORWARD)
7596 			te = got_tree_entry_get_next(s->tree, te);
7597 		else
7598 			te = got_tree_entry_get_prev(s->tree, te);
7599 	}
7600 
7601 	if (s->matched_entry) {
7602 		s->first_displayed_entry = s->matched_entry;
7603 		s->selected = 0;
7604 	}
7605 
7606 	return NULL;
7607 }
7608 
7609 static const struct got_error *
7610 show_tree_view(struct tog_view *view)
7611 {
7612 	const struct got_error *err = NULL;
7613 	struct tog_tree_view_state *s = &view->state.tree;
7614 	char *parent_path;
7615 
7616 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7617 	if (err)
7618 		return err;
7619 
7620 	err = draw_tree_entries(view, parent_path);
7621 	free(parent_path);
7622 
7623 	view_border(view);
7624 	return err;
7625 }
7626 
7627 static const struct got_error *
7628 tree_goto_line(struct tog_view *view, int nlines)
7629 {
7630 	const struct got_error		 *err = NULL;
7631 	struct tog_tree_view_state	 *s = &view->state.tree;
7632 	struct got_tree_entry		**fte, **lte, **ste;
7633 	int				  g, last, first = 1, i = 1;
7634 	int				  root = s->tree == s->root;
7635 	int				  off = root ? 1 : 2;
7636 
7637 	g = view->gline;
7638 	view->gline = 0;
7639 
7640 	if (g == 0)
7641 		g = 1;
7642 	else if (g > got_object_tree_get_nentries(s->tree))
7643 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7644 
7645 	fte = &s->first_displayed_entry;
7646 	lte = &s->last_displayed_entry;
7647 	ste = &s->selected_entry;
7648 
7649 	if (*fte != NULL) {
7650 		first = got_tree_entry_get_index(*fte);
7651 		first += off;  /* account for ".." */
7652 	}
7653 	last = got_tree_entry_get_index(*lte);
7654 	last += off;
7655 
7656 	if (g >= first && g <= last && g - first < nlines) {
7657 		s->selected = g - first;
7658 		return NULL;	/* gline is on the current page */
7659 	}
7660 
7661 	if (*ste != NULL) {
7662 		i = got_tree_entry_get_index(*ste);
7663 		i += off;
7664 	}
7665 
7666 	if (i < g) {
7667 		err = tree_scroll_down(view, g - i);
7668 		if (err)
7669 			return err;
7670 		if (got_tree_entry_get_index(*lte) >=
7671 		    got_object_tree_get_nentries(s->tree) - 1 &&
7672 		    first + s->selected < g &&
7673 		    s->selected < s->ndisplayed - 1) {
7674 			first = got_tree_entry_get_index(*fte);
7675 			first += off;
7676 			s->selected = g - first;
7677 		}
7678 	} else if (i > g)
7679 		tree_scroll_up(s, i - g);
7680 
7681 	if (g < nlines &&
7682 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7683 		s->selected = g - 1;
7684 
7685 	return NULL;
7686 }
7687 
7688 static const struct got_error *
7689 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7690 {
7691 	const struct got_error *err = NULL;
7692 	struct tog_tree_view_state *s = &view->state.tree;
7693 	struct got_tree_entry *te;
7694 	int n, nscroll = view->nlines - 3;
7695 
7696 	if (view->gline)
7697 		return tree_goto_line(view, nscroll);
7698 
7699 	switch (ch) {
7700 	case '0':
7701 	case '$':
7702 	case KEY_RIGHT:
7703 	case 'l':
7704 	case KEY_LEFT:
7705 	case 'h':
7706 		horizontal_scroll_input(view, ch);
7707 		break;
7708 	case 'i':
7709 		s->show_ids = !s->show_ids;
7710 		view->count = 0;
7711 		break;
7712 	case 'L':
7713 		view->count = 0;
7714 		if (!s->selected_entry)
7715 			break;
7716 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7717 		break;
7718 	case 'R':
7719 		view->count = 0;
7720 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7721 		break;
7722 	case 'g':
7723 	case '=':
7724 	case KEY_HOME:
7725 		s->selected = 0;
7726 		view->count = 0;
7727 		if (s->tree == s->root)
7728 			s->first_displayed_entry =
7729 			    got_object_tree_get_first_entry(s->tree);
7730 		else
7731 			s->first_displayed_entry = NULL;
7732 		break;
7733 	case 'G':
7734 	case '*':
7735 	case KEY_END: {
7736 		int eos = view->nlines - 3;
7737 
7738 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7739 			--eos;  /* border */
7740 		s->selected = 0;
7741 		view->count = 0;
7742 		te = got_object_tree_get_last_entry(s->tree);
7743 		for (n = 0; n < eos; n++) {
7744 			if (te == NULL) {
7745 				if (s->tree != s->root) {
7746 					s->first_displayed_entry = NULL;
7747 					n++;
7748 				}
7749 				break;
7750 			}
7751 			s->first_displayed_entry = te;
7752 			te = got_tree_entry_get_prev(s->tree, te);
7753 		}
7754 		if (n > 0)
7755 			s->selected = n - 1;
7756 		break;
7757 	}
7758 	case 'k':
7759 	case KEY_UP:
7760 	case CTRL('p'):
7761 		if (s->selected > 0) {
7762 			s->selected--;
7763 			break;
7764 		}
7765 		tree_scroll_up(s, 1);
7766 		if (s->selected_entry == NULL ||
7767 		    (s->tree == s->root && s->selected_entry ==
7768 		     got_object_tree_get_first_entry(s->tree)))
7769 			view->count = 0;
7770 		break;
7771 	case CTRL('u'):
7772 	case 'u':
7773 		nscroll /= 2;
7774 		/* FALL THROUGH */
7775 	case KEY_PPAGE:
7776 	case CTRL('b'):
7777 	case 'b':
7778 		if (s->tree == s->root) {
7779 			if (got_object_tree_get_first_entry(s->tree) ==
7780 			    s->first_displayed_entry)
7781 				s->selected -= MIN(s->selected, nscroll);
7782 		} else {
7783 			if (s->first_displayed_entry == NULL)
7784 				s->selected -= MIN(s->selected, nscroll);
7785 		}
7786 		tree_scroll_up(s, MAX(0, nscroll));
7787 		if (s->selected_entry == NULL ||
7788 		    (s->tree == s->root && s->selected_entry ==
7789 		     got_object_tree_get_first_entry(s->tree)))
7790 			view->count = 0;
7791 		break;
7792 	case 'j':
7793 	case KEY_DOWN:
7794 	case CTRL('n'):
7795 		if (s->selected < s->ndisplayed - 1) {
7796 			s->selected++;
7797 			break;
7798 		}
7799 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7800 		    == NULL) {
7801 			/* can't scroll any further */
7802 			view->count = 0;
7803 			break;
7804 		}
7805 		tree_scroll_down(view, 1);
7806 		break;
7807 	case CTRL('d'):
7808 	case 'd':
7809 		nscroll /= 2;
7810 		/* FALL THROUGH */
7811 	case KEY_NPAGE:
7812 	case CTRL('f'):
7813 	case 'f':
7814 	case ' ':
7815 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7816 		    == NULL) {
7817 			/* can't scroll any further; move cursor down */
7818 			if (s->selected < s->ndisplayed - 1)
7819 				s->selected += MIN(nscroll,
7820 				    s->ndisplayed - s->selected - 1);
7821 			else
7822 				view->count = 0;
7823 			break;
7824 		}
7825 		tree_scroll_down(view, nscroll);
7826 		break;
7827 	case KEY_ENTER:
7828 	case '\r':
7829 	case KEY_BACKSPACE:
7830 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7831 			struct tog_parent_tree *parent;
7832 			/* user selected '..' */
7833 			if (s->tree == s->root) {
7834 				view->count = 0;
7835 				break;
7836 			}
7837 			parent = TAILQ_FIRST(&s->parents);
7838 			TAILQ_REMOVE(&s->parents, parent,
7839 			    entry);
7840 			got_object_tree_close(s->tree);
7841 			s->tree = parent->tree;
7842 			s->first_displayed_entry =
7843 			    parent->first_displayed_entry;
7844 			s->selected_entry =
7845 			    parent->selected_entry;
7846 			s->selected = parent->selected;
7847 			if (s->selected > view->nlines - 3) {
7848 				err = offset_selection_down(view);
7849 				if (err)
7850 					break;
7851 			}
7852 			free(parent);
7853 		} else if (S_ISDIR(got_tree_entry_get_mode(
7854 		    s->selected_entry))) {
7855 			struct got_tree_object *subtree;
7856 			view->count = 0;
7857 			err = got_object_open_as_tree(&subtree, s->repo,
7858 			    got_tree_entry_get_id(s->selected_entry));
7859 			if (err)
7860 				break;
7861 			err = tree_view_visit_subtree(s, subtree);
7862 			if (err) {
7863 				got_object_tree_close(subtree);
7864 				break;
7865 			}
7866 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7867 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7868 		break;
7869 	case KEY_RESIZE:
7870 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7871 			s->selected = view->nlines - 4;
7872 		view->count = 0;
7873 		break;
7874 	default:
7875 		view->count = 0;
7876 		break;
7877 	}
7878 
7879 	return err;
7880 }
7881 
7882 __dead static void
7883 usage_tree(void)
7884 {
7885 	endwin();
7886 	fprintf(stderr,
7887 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7888 	    getprogname());
7889 	exit(1);
7890 }
7891 
7892 static const struct got_error *
7893 cmd_tree(int argc, char *argv[])
7894 {
7895 	const struct got_error *io_err, *error;
7896 	struct got_repository *repo = NULL;
7897 	struct got_worktree *worktree = NULL;
7898 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7899 	struct got_object_id *commit_id = NULL;
7900 	struct got_commit_object *commit = NULL;
7901 	const char *commit_id_arg = NULL;
7902 	char *label = NULL;
7903 	struct got_reference *ref = NULL;
7904 	const char *head_ref_name = NULL;
7905 	int ch;
7906 	struct tog_view *view;
7907 	struct tog_io *tog_io = NULL;
7908 	int *pack_fds = NULL;
7909 
7910 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7911 		switch (ch) {
7912 		case 'c':
7913 			commit_id_arg = optarg;
7914 			break;
7915 		case 'r':
7916 			repo_path = realpath(optarg, NULL);
7917 			if (repo_path == NULL)
7918 				return got_error_from_errno2("realpath",
7919 				    optarg);
7920 			break;
7921 		default:
7922 			usage_tree();
7923 			/* NOTREACHED */
7924 		}
7925 	}
7926 
7927 	argc -= optind;
7928 	argv += optind;
7929 
7930 	if (argc > 1)
7931 		usage_tree();
7932 
7933 	error = got_repo_pack_fds_open(&pack_fds);
7934 	if (error != NULL)
7935 		goto done;
7936 
7937 	if (repo_path == NULL) {
7938 		cwd = getcwd(NULL, 0);
7939 		if (cwd == NULL)
7940 			return got_error_from_errno("getcwd");
7941 		error = got_worktree_open(&worktree, cwd);
7942 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7943 			goto done;
7944 		if (worktree)
7945 			repo_path =
7946 			    strdup(got_worktree_get_repo_path(worktree));
7947 		else
7948 			repo_path = strdup(cwd);
7949 		if (repo_path == NULL) {
7950 			error = got_error_from_errno("strdup");
7951 			goto done;
7952 		}
7953 	}
7954 
7955 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7956 	if (error != NULL)
7957 		goto done;
7958 
7959 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7960 	    repo, worktree);
7961 	if (error)
7962 		goto done;
7963 
7964 	error = init_curses(&tog_io);
7965 	if (error)
7966 		goto done;
7967 
7968 	error = apply_unveil(got_repo_get_path(repo), NULL);
7969 	if (error)
7970 		goto done;
7971 
7972 	error = tog_load_refs(repo, 0);
7973 	if (error)
7974 		goto done;
7975 
7976 	if (commit_id_arg == NULL) {
7977 		error = got_repo_match_object_id(&commit_id, &label,
7978 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7979 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7980 		if (error)
7981 			goto done;
7982 		head_ref_name = label;
7983 	} else {
7984 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7985 		if (error == NULL)
7986 			head_ref_name = got_ref_get_name(ref);
7987 		else if (error->code != GOT_ERR_NOT_REF)
7988 			goto done;
7989 		error = got_repo_match_object_id(&commit_id, NULL,
7990 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7991 		if (error)
7992 			goto done;
7993 	}
7994 
7995 	error = got_object_open_as_commit(&commit, repo, commit_id);
7996 	if (error)
7997 		goto done;
7998 
7999 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8000 	if (view == NULL) {
8001 		error = got_error_from_errno("view_open");
8002 		goto done;
8003 	}
8004 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8005 	if (error)
8006 		goto done;
8007 	if (!got_path_is_root_dir(in_repo_path)) {
8008 		error = tree_view_walk_path(&view->state.tree, commit,
8009 		    in_repo_path);
8010 		if (error)
8011 			goto done;
8012 	}
8013 
8014 	if (worktree) {
8015 		/* Release work tree lock. */
8016 		got_worktree_close(worktree);
8017 		worktree = NULL;
8018 	}
8019 	error = view_loop(view, tog_io);
8020 done:
8021 	free(repo_path);
8022 	free(cwd);
8023 	free(commit_id);
8024 	free(label);
8025 	if (ref)
8026 		got_ref_close(ref);
8027 	if (repo) {
8028 		const struct got_error *close_err = got_repo_close(repo);
8029 		if (error == NULL)
8030 			error = close_err;
8031 	}
8032 	if (pack_fds) {
8033 		const struct got_error *pack_err =
8034 		    got_repo_pack_fds_close(pack_fds);
8035 		if (error == NULL)
8036 			error = pack_err;
8037 	}
8038 	if (tog_io != NULL) {
8039 		io_err = tog_io_close(tog_io);
8040 		if (error == NULL)
8041 			error = io_err;
8042 	}
8043 	tog_free_refs();
8044 	return error;
8045 }
8046 
8047 static const struct got_error *
8048 ref_view_load_refs(struct tog_ref_view_state *s)
8049 {
8050 	struct got_reflist_entry *sre;
8051 	struct tog_reflist_entry *re;
8052 
8053 	s->nrefs = 0;
8054 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8055 		if (strncmp(got_ref_get_name(sre->ref),
8056 		    "refs/got/", 9) == 0 &&
8057 		    strncmp(got_ref_get_name(sre->ref),
8058 		    "refs/got/backup/", 16) != 0)
8059 			continue;
8060 
8061 		re = malloc(sizeof(*re));
8062 		if (re == NULL)
8063 			return got_error_from_errno("malloc");
8064 
8065 		re->ref = got_ref_dup(sre->ref);
8066 		if (re->ref == NULL)
8067 			return got_error_from_errno("got_ref_dup");
8068 		re->idx = s->nrefs++;
8069 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8070 	}
8071 
8072 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8073 	return NULL;
8074 }
8075 
8076 static void
8077 ref_view_free_refs(struct tog_ref_view_state *s)
8078 {
8079 	struct tog_reflist_entry *re;
8080 
8081 	while (!TAILQ_EMPTY(&s->refs)) {
8082 		re = TAILQ_FIRST(&s->refs);
8083 		TAILQ_REMOVE(&s->refs, re, entry);
8084 		got_ref_close(re->ref);
8085 		free(re);
8086 	}
8087 }
8088 
8089 static const struct got_error *
8090 open_ref_view(struct tog_view *view, struct got_repository *repo)
8091 {
8092 	const struct got_error *err = NULL;
8093 	struct tog_ref_view_state *s = &view->state.ref;
8094 
8095 	s->selected_entry = 0;
8096 	s->repo = repo;
8097 
8098 	TAILQ_INIT(&s->refs);
8099 	STAILQ_INIT(&s->colors);
8100 
8101 	err = ref_view_load_refs(s);
8102 	if (err)
8103 		return err;
8104 
8105 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8106 		err = add_color(&s->colors, "^refs/heads/",
8107 		    TOG_COLOR_REFS_HEADS,
8108 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8109 		if (err)
8110 			goto done;
8111 
8112 		err = add_color(&s->colors, "^refs/tags/",
8113 		    TOG_COLOR_REFS_TAGS,
8114 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8115 		if (err)
8116 			goto done;
8117 
8118 		err = add_color(&s->colors, "^refs/remotes/",
8119 		    TOG_COLOR_REFS_REMOTES,
8120 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8121 		if (err)
8122 			goto done;
8123 
8124 		err = add_color(&s->colors, "^refs/got/backup/",
8125 		    TOG_COLOR_REFS_BACKUP,
8126 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8127 		if (err)
8128 			goto done;
8129 	}
8130 
8131 	view->show = show_ref_view;
8132 	view->input = input_ref_view;
8133 	view->close = close_ref_view;
8134 	view->search_start = search_start_ref_view;
8135 	view->search_next = search_next_ref_view;
8136 done:
8137 	if (err)
8138 		free_colors(&s->colors);
8139 	return err;
8140 }
8141 
8142 static const struct got_error *
8143 close_ref_view(struct tog_view *view)
8144 {
8145 	struct tog_ref_view_state *s = &view->state.ref;
8146 
8147 	ref_view_free_refs(s);
8148 	free_colors(&s->colors);
8149 
8150 	return NULL;
8151 }
8152 
8153 static const struct got_error *
8154 resolve_reflist_entry(struct got_object_id **commit_id,
8155     struct tog_reflist_entry *re, struct got_repository *repo)
8156 {
8157 	const struct got_error *err = NULL;
8158 	struct got_object_id *obj_id;
8159 	struct got_tag_object *tag = NULL;
8160 	int obj_type;
8161 
8162 	*commit_id = NULL;
8163 
8164 	err = got_ref_resolve(&obj_id, repo, re->ref);
8165 	if (err)
8166 		return err;
8167 
8168 	err = got_object_get_type(&obj_type, repo, obj_id);
8169 	if (err)
8170 		goto done;
8171 
8172 	switch (obj_type) {
8173 	case GOT_OBJ_TYPE_COMMIT:
8174 		*commit_id = obj_id;
8175 		break;
8176 	case GOT_OBJ_TYPE_TAG:
8177 		err = got_object_open_as_tag(&tag, repo, obj_id);
8178 		if (err)
8179 			goto done;
8180 		free(obj_id);
8181 		err = got_object_get_type(&obj_type, repo,
8182 		    got_object_tag_get_object_id(tag));
8183 		if (err)
8184 			goto done;
8185 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8186 			err = got_error(GOT_ERR_OBJ_TYPE);
8187 			goto done;
8188 		}
8189 		*commit_id = got_object_id_dup(
8190 		    got_object_tag_get_object_id(tag));
8191 		if (*commit_id == NULL) {
8192 			err = got_error_from_errno("got_object_id_dup");
8193 			goto done;
8194 		}
8195 		break;
8196 	default:
8197 		err = got_error(GOT_ERR_OBJ_TYPE);
8198 		break;
8199 	}
8200 
8201 done:
8202 	if (tag)
8203 		got_object_tag_close(tag);
8204 	if (err) {
8205 		free(*commit_id);
8206 		*commit_id = NULL;
8207 	}
8208 	return err;
8209 }
8210 
8211 static const struct got_error *
8212 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8213     struct tog_reflist_entry *re, struct got_repository *repo)
8214 {
8215 	struct tog_view *log_view;
8216 	const struct got_error *err = NULL;
8217 	struct got_object_id *commit_id = NULL;
8218 
8219 	*new_view = NULL;
8220 
8221 	err = resolve_reflist_entry(&commit_id, re, repo);
8222 	if (err) {
8223 		if (err->code != GOT_ERR_OBJ_TYPE)
8224 			return err;
8225 		else
8226 			return NULL;
8227 	}
8228 
8229 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8230 	if (log_view == NULL) {
8231 		err = got_error_from_errno("view_open");
8232 		goto done;
8233 	}
8234 
8235 	err = open_log_view(log_view, commit_id, repo,
8236 	    got_ref_get_name(re->ref), "", 0);
8237 done:
8238 	if (err)
8239 		view_close(log_view);
8240 	else
8241 		*new_view = log_view;
8242 	free(commit_id);
8243 	return err;
8244 }
8245 
8246 static void
8247 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8248 {
8249 	struct tog_reflist_entry *re;
8250 	int i = 0;
8251 
8252 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8253 		return;
8254 
8255 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8256 	while (i++ < maxscroll) {
8257 		if (re == NULL)
8258 			break;
8259 		s->first_displayed_entry = re;
8260 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8261 	}
8262 }
8263 
8264 static const struct got_error *
8265 ref_scroll_down(struct tog_view *view, int maxscroll)
8266 {
8267 	struct tog_ref_view_state *s = &view->state.ref;
8268 	struct tog_reflist_entry *next, *last;
8269 	int n = 0;
8270 
8271 	if (s->first_displayed_entry)
8272 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8273 	else
8274 		next = TAILQ_FIRST(&s->refs);
8275 
8276 	last = s->last_displayed_entry;
8277 	while (next && n++ < maxscroll) {
8278 		if (last) {
8279 			s->last_displayed_entry = last;
8280 			last = TAILQ_NEXT(last, entry);
8281 		}
8282 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8283 			s->first_displayed_entry = next;
8284 			next = TAILQ_NEXT(next, entry);
8285 		}
8286 	}
8287 
8288 	return NULL;
8289 }
8290 
8291 static const struct got_error *
8292 search_start_ref_view(struct tog_view *view)
8293 {
8294 	struct tog_ref_view_state *s = &view->state.ref;
8295 
8296 	s->matched_entry = NULL;
8297 	return NULL;
8298 }
8299 
8300 static int
8301 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8302 {
8303 	regmatch_t regmatch;
8304 
8305 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8306 	    0) == 0;
8307 }
8308 
8309 static const struct got_error *
8310 search_next_ref_view(struct tog_view *view)
8311 {
8312 	struct tog_ref_view_state *s = &view->state.ref;
8313 	struct tog_reflist_entry *re = NULL;
8314 
8315 	if (!view->searching) {
8316 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8317 		return NULL;
8318 	}
8319 
8320 	if (s->matched_entry) {
8321 		if (view->searching == TOG_SEARCH_FORWARD) {
8322 			if (s->selected_entry)
8323 				re = TAILQ_NEXT(s->selected_entry, entry);
8324 			else
8325 				re = TAILQ_PREV(s->selected_entry,
8326 				    tog_reflist_head, entry);
8327 		} else {
8328 			if (s->selected_entry == NULL)
8329 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8330 			else
8331 				re = TAILQ_PREV(s->selected_entry,
8332 				    tog_reflist_head, entry);
8333 		}
8334 	} else {
8335 		if (s->selected_entry)
8336 			re = s->selected_entry;
8337 		else if (view->searching == TOG_SEARCH_FORWARD)
8338 			re = TAILQ_FIRST(&s->refs);
8339 		else
8340 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8341 	}
8342 
8343 	while (1) {
8344 		if (re == NULL) {
8345 			if (s->matched_entry == NULL) {
8346 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8347 				return NULL;
8348 			}
8349 			if (view->searching == TOG_SEARCH_FORWARD)
8350 				re = TAILQ_FIRST(&s->refs);
8351 			else
8352 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8353 		}
8354 
8355 		if (match_reflist_entry(re, &view->regex)) {
8356 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8357 			s->matched_entry = re;
8358 			break;
8359 		}
8360 
8361 		if (view->searching == TOG_SEARCH_FORWARD)
8362 			re = TAILQ_NEXT(re, entry);
8363 		else
8364 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8365 	}
8366 
8367 	if (s->matched_entry) {
8368 		s->first_displayed_entry = s->matched_entry;
8369 		s->selected = 0;
8370 	}
8371 
8372 	return NULL;
8373 }
8374 
8375 static const struct got_error *
8376 show_ref_view(struct tog_view *view)
8377 {
8378 	const struct got_error *err = NULL;
8379 	struct tog_ref_view_state *s = &view->state.ref;
8380 	struct tog_reflist_entry *re;
8381 	char *line = NULL;
8382 	wchar_t *wline;
8383 	struct tog_color *tc;
8384 	int width, n, scrollx;
8385 	int limit = view->nlines;
8386 
8387 	werase(view->window);
8388 
8389 	s->ndisplayed = 0;
8390 	if (view_is_hsplit_top(view))
8391 		--limit;  /* border */
8392 
8393 	if (limit == 0)
8394 		return NULL;
8395 
8396 	re = s->first_displayed_entry;
8397 
8398 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8399 	    s->nrefs) == -1)
8400 		return got_error_from_errno("asprintf");
8401 
8402 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8403 	if (err) {
8404 		free(line);
8405 		return err;
8406 	}
8407 	if (view_needs_focus_indication(view))
8408 		wstandout(view->window);
8409 	waddwstr(view->window, wline);
8410 	while (width++ < view->ncols)
8411 		waddch(view->window, ' ');
8412 	if (view_needs_focus_indication(view))
8413 		wstandend(view->window);
8414 	free(wline);
8415 	wline = NULL;
8416 	free(line);
8417 	line = NULL;
8418 	if (--limit <= 0)
8419 		return NULL;
8420 
8421 	n = 0;
8422 	view->maxx = 0;
8423 	while (re && limit > 0) {
8424 		char *line = NULL;
8425 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8426 
8427 		if (s->show_date) {
8428 			struct got_commit_object *ci;
8429 			struct got_tag_object *tag;
8430 			struct got_object_id *id;
8431 			struct tm tm;
8432 			time_t t;
8433 
8434 			err = got_ref_resolve(&id, s->repo, re->ref);
8435 			if (err)
8436 				return err;
8437 			err = got_object_open_as_tag(&tag, s->repo, id);
8438 			if (err) {
8439 				if (err->code != GOT_ERR_OBJ_TYPE) {
8440 					free(id);
8441 					return err;
8442 				}
8443 				err = got_object_open_as_commit(&ci, s->repo,
8444 				    id);
8445 				if (err) {
8446 					free(id);
8447 					return err;
8448 				}
8449 				t = got_object_commit_get_committer_time(ci);
8450 				got_object_commit_close(ci);
8451 			} else {
8452 				t = got_object_tag_get_tagger_time(tag);
8453 				got_object_tag_close(tag);
8454 			}
8455 			free(id);
8456 			if (gmtime_r(&t, &tm) == NULL)
8457 				return got_error_from_errno("gmtime_r");
8458 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8459 				return got_error(GOT_ERR_NO_SPACE);
8460 		}
8461 		if (got_ref_is_symbolic(re->ref)) {
8462 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8463 			    ymd : "", got_ref_get_name(re->ref),
8464 			    got_ref_get_symref_target(re->ref)) == -1)
8465 				return got_error_from_errno("asprintf");
8466 		} else if (s->show_ids) {
8467 			struct got_object_id *id;
8468 			char *id_str;
8469 			err = got_ref_resolve(&id, s->repo, re->ref);
8470 			if (err)
8471 				return err;
8472 			err = got_object_id_str(&id_str, id);
8473 			if (err) {
8474 				free(id);
8475 				return err;
8476 			}
8477 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8478 			    got_ref_get_name(re->ref), id_str) == -1) {
8479 				err = got_error_from_errno("asprintf");
8480 				free(id);
8481 				free(id_str);
8482 				return err;
8483 			}
8484 			free(id);
8485 			free(id_str);
8486 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8487 		    got_ref_get_name(re->ref)) == -1)
8488 			return got_error_from_errno("asprintf");
8489 
8490 		/* use full line width to determine view->maxx */
8491 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8492 		if (err) {
8493 			free(line);
8494 			return err;
8495 		}
8496 		view->maxx = MAX(view->maxx, width);
8497 		free(wline);
8498 		wline = NULL;
8499 
8500 		err = format_line(&wline, &width, &scrollx, line, view->x,
8501 		    view->ncols, 0, 0);
8502 		if (err) {
8503 			free(line);
8504 			return err;
8505 		}
8506 		if (n == s->selected) {
8507 			if (view->focussed)
8508 				wstandout(view->window);
8509 			s->selected_entry = re;
8510 		}
8511 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8512 		if (tc)
8513 			wattr_on(view->window,
8514 			    COLOR_PAIR(tc->colorpair), NULL);
8515 		waddwstr(view->window, &wline[scrollx]);
8516 		if (tc)
8517 			wattr_off(view->window,
8518 			    COLOR_PAIR(tc->colorpair), NULL);
8519 		if (width < view->ncols)
8520 			waddch(view->window, '\n');
8521 		if (n == s->selected && view->focussed)
8522 			wstandend(view->window);
8523 		free(line);
8524 		free(wline);
8525 		wline = NULL;
8526 		n++;
8527 		s->ndisplayed++;
8528 		s->last_displayed_entry = re;
8529 
8530 		limit--;
8531 		re = TAILQ_NEXT(re, entry);
8532 	}
8533 
8534 	view_border(view);
8535 	return err;
8536 }
8537 
8538 static const struct got_error *
8539 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8540     struct tog_reflist_entry *re, struct got_repository *repo)
8541 {
8542 	const struct got_error *err = NULL;
8543 	struct got_object_id *commit_id = NULL;
8544 	struct tog_view *tree_view;
8545 
8546 	*new_view = NULL;
8547 
8548 	err = resolve_reflist_entry(&commit_id, re, repo);
8549 	if (err) {
8550 		if (err->code != GOT_ERR_OBJ_TYPE)
8551 			return err;
8552 		else
8553 			return NULL;
8554 	}
8555 
8556 
8557 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8558 	if (tree_view == NULL) {
8559 		err = got_error_from_errno("view_open");
8560 		goto done;
8561 	}
8562 
8563 	err = open_tree_view(tree_view, commit_id,
8564 	    got_ref_get_name(re->ref), repo);
8565 	if (err)
8566 		goto done;
8567 
8568 	*new_view = tree_view;
8569 done:
8570 	free(commit_id);
8571 	return err;
8572 }
8573 
8574 static const struct got_error *
8575 ref_goto_line(struct tog_view *view, int nlines)
8576 {
8577 	const struct got_error		*err = NULL;
8578 	struct tog_ref_view_state	*s = &view->state.ref;
8579 	int				 g, idx = s->selected_entry->idx;
8580 
8581 	g = view->gline;
8582 	view->gline = 0;
8583 
8584 	if (g == 0)
8585 		g = 1;
8586 	else if (g > s->nrefs)
8587 		g = s->nrefs;
8588 
8589 	if (g >= s->first_displayed_entry->idx + 1 &&
8590 	    g <= s->last_displayed_entry->idx + 1 &&
8591 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8592 		s->selected = g - s->first_displayed_entry->idx - 1;
8593 		return NULL;
8594 	}
8595 
8596 	if (idx + 1 < g) {
8597 		err = ref_scroll_down(view, g - idx - 1);
8598 		if (err)
8599 			return err;
8600 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8601 		    s->first_displayed_entry->idx + s->selected < g &&
8602 		    s->selected < s->ndisplayed - 1)
8603 			s->selected = g - s->first_displayed_entry->idx - 1;
8604 	} else if (idx + 1 > g)
8605 		ref_scroll_up(s, idx - g + 1);
8606 
8607 	if (g < nlines && s->first_displayed_entry->idx == 0)
8608 		s->selected = g - 1;
8609 
8610 	return NULL;
8611 
8612 }
8613 
8614 static const struct got_error *
8615 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8616 {
8617 	const struct got_error *err = NULL;
8618 	struct tog_ref_view_state *s = &view->state.ref;
8619 	struct tog_reflist_entry *re;
8620 	int n, nscroll = view->nlines - 1;
8621 
8622 	if (view->gline)
8623 		return ref_goto_line(view, nscroll);
8624 
8625 	switch (ch) {
8626 	case '0':
8627 	case '$':
8628 	case KEY_RIGHT:
8629 	case 'l':
8630 	case KEY_LEFT:
8631 	case 'h':
8632 		horizontal_scroll_input(view, ch);
8633 		break;
8634 	case 'i':
8635 		s->show_ids = !s->show_ids;
8636 		view->count = 0;
8637 		break;
8638 	case 'm':
8639 		s->show_date = !s->show_date;
8640 		view->count = 0;
8641 		break;
8642 	case 'o':
8643 		s->sort_by_date = !s->sort_by_date;
8644 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8645 		view->count = 0;
8646 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8647 		    got_ref_cmp_by_commit_timestamp_descending :
8648 		    tog_ref_cmp_by_name, s->repo);
8649 		if (err)
8650 			break;
8651 		got_reflist_object_id_map_free(tog_refs_idmap);
8652 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8653 		    &tog_refs, s->repo);
8654 		if (err)
8655 			break;
8656 		ref_view_free_refs(s);
8657 		err = ref_view_load_refs(s);
8658 		break;
8659 	case KEY_ENTER:
8660 	case '\r':
8661 		view->count = 0;
8662 		if (!s->selected_entry)
8663 			break;
8664 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8665 		break;
8666 	case 'T':
8667 		view->count = 0;
8668 		if (!s->selected_entry)
8669 			break;
8670 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8671 		break;
8672 	case 'g':
8673 	case '=':
8674 	case KEY_HOME:
8675 		s->selected = 0;
8676 		view->count = 0;
8677 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8678 		break;
8679 	case 'G':
8680 	case '*':
8681 	case KEY_END: {
8682 		int eos = view->nlines - 1;
8683 
8684 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8685 			--eos;  /* border */
8686 		s->selected = 0;
8687 		view->count = 0;
8688 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8689 		for (n = 0; n < eos; n++) {
8690 			if (re == NULL)
8691 				break;
8692 			s->first_displayed_entry = re;
8693 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8694 		}
8695 		if (n > 0)
8696 			s->selected = n - 1;
8697 		break;
8698 	}
8699 	case 'k':
8700 	case KEY_UP:
8701 	case CTRL('p'):
8702 		if (s->selected > 0) {
8703 			s->selected--;
8704 			break;
8705 		}
8706 		ref_scroll_up(s, 1);
8707 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8708 			view->count = 0;
8709 		break;
8710 	case CTRL('u'):
8711 	case 'u':
8712 		nscroll /= 2;
8713 		/* FALL THROUGH */
8714 	case KEY_PPAGE:
8715 	case CTRL('b'):
8716 	case 'b':
8717 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8718 			s->selected -= MIN(nscroll, s->selected);
8719 		ref_scroll_up(s, MAX(0, nscroll));
8720 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8721 			view->count = 0;
8722 		break;
8723 	case 'j':
8724 	case KEY_DOWN:
8725 	case CTRL('n'):
8726 		if (s->selected < s->ndisplayed - 1) {
8727 			s->selected++;
8728 			break;
8729 		}
8730 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8731 			/* can't scroll any further */
8732 			view->count = 0;
8733 			break;
8734 		}
8735 		ref_scroll_down(view, 1);
8736 		break;
8737 	case CTRL('d'):
8738 	case 'd':
8739 		nscroll /= 2;
8740 		/* FALL THROUGH */
8741 	case KEY_NPAGE:
8742 	case CTRL('f'):
8743 	case 'f':
8744 	case ' ':
8745 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8746 			/* can't scroll any further; move cursor down */
8747 			if (s->selected < s->ndisplayed - 1)
8748 				s->selected += MIN(nscroll,
8749 				    s->ndisplayed - s->selected - 1);
8750 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8751 				s->selected += s->ndisplayed - s->selected - 1;
8752 			view->count = 0;
8753 			break;
8754 		}
8755 		ref_scroll_down(view, nscroll);
8756 		break;
8757 	case CTRL('l'):
8758 		view->count = 0;
8759 		tog_free_refs();
8760 		err = tog_load_refs(s->repo, s->sort_by_date);
8761 		if (err)
8762 			break;
8763 		ref_view_free_refs(s);
8764 		err = ref_view_load_refs(s);
8765 		break;
8766 	case KEY_RESIZE:
8767 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8768 			s->selected = view->nlines - 2;
8769 		break;
8770 	default:
8771 		view->count = 0;
8772 		break;
8773 	}
8774 
8775 	return err;
8776 }
8777 
8778 __dead static void
8779 usage_ref(void)
8780 {
8781 	endwin();
8782 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8783 	    getprogname());
8784 	exit(1);
8785 }
8786 
8787 static const struct got_error *
8788 cmd_ref(int argc, char *argv[])
8789 {
8790 	const struct got_error *io_err, *error;
8791 	struct got_repository *repo = NULL;
8792 	struct got_worktree *worktree = NULL;
8793 	char *cwd = NULL, *repo_path = NULL;
8794 	int ch;
8795 	struct tog_view *view;
8796 	struct tog_io *tog_io = NULL;
8797 	int *pack_fds = NULL;
8798 
8799 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8800 		switch (ch) {
8801 		case 'r':
8802 			repo_path = realpath(optarg, NULL);
8803 			if (repo_path == NULL)
8804 				return got_error_from_errno2("realpath",
8805 				    optarg);
8806 			break;
8807 		default:
8808 			usage_ref();
8809 			/* NOTREACHED */
8810 		}
8811 	}
8812 
8813 	argc -= optind;
8814 	argv += optind;
8815 
8816 	if (argc > 1)
8817 		usage_ref();
8818 
8819 	error = got_repo_pack_fds_open(&pack_fds);
8820 	if (error != NULL)
8821 		goto done;
8822 
8823 	if (repo_path == NULL) {
8824 		cwd = getcwd(NULL, 0);
8825 		if (cwd == NULL)
8826 			return got_error_from_errno("getcwd");
8827 		error = got_worktree_open(&worktree, cwd);
8828 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8829 			goto done;
8830 		if (worktree)
8831 			repo_path =
8832 			    strdup(got_worktree_get_repo_path(worktree));
8833 		else
8834 			repo_path = strdup(cwd);
8835 		if (repo_path == NULL) {
8836 			error = got_error_from_errno("strdup");
8837 			goto done;
8838 		}
8839 	}
8840 
8841 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8842 	if (error != NULL)
8843 		goto done;
8844 
8845 	error = init_curses(&tog_io);
8846 	if (error)
8847 		goto done;
8848 
8849 	error = apply_unveil(got_repo_get_path(repo), NULL);
8850 	if (error)
8851 		goto done;
8852 
8853 	error = tog_load_refs(repo, 0);
8854 	if (error)
8855 		goto done;
8856 
8857 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8858 	if (view == NULL) {
8859 		error = got_error_from_errno("view_open");
8860 		goto done;
8861 	}
8862 
8863 	error = open_ref_view(view, repo);
8864 	if (error)
8865 		goto done;
8866 
8867 	if (worktree) {
8868 		/* Release work tree lock. */
8869 		got_worktree_close(worktree);
8870 		worktree = NULL;
8871 	}
8872 	error = view_loop(view, tog_io);
8873 done:
8874 	free(repo_path);
8875 	free(cwd);
8876 	if (repo) {
8877 		const struct got_error *close_err = got_repo_close(repo);
8878 		if (close_err)
8879 			error = close_err;
8880 	}
8881 	if (pack_fds) {
8882 		const struct got_error *pack_err =
8883 		    got_repo_pack_fds_close(pack_fds);
8884 		if (error == NULL)
8885 			error = pack_err;
8886 	}
8887 	if (tog_io != NULL) {
8888 		io_err = tog_io_close(tog_io);
8889 		if (error == NULL)
8890 			error = io_err;
8891 	}
8892 	tog_free_refs();
8893 	return error;
8894 }
8895 
8896 static const struct got_error*
8897 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8898     const char *str)
8899 {
8900 	size_t len;
8901 
8902 	if (win == NULL)
8903 		win = stdscr;
8904 
8905 	len = strlen(str);
8906 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8907 
8908 	if (focus)
8909 		wstandout(win);
8910 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8911 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8912 	if (focus)
8913 		wstandend(win);
8914 
8915 	return NULL;
8916 }
8917 
8918 static const struct got_error *
8919 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8920 {
8921 	off_t *p;
8922 
8923 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8924 	if (p == NULL) {
8925 		free(*line_offsets);
8926 		*line_offsets = NULL;
8927 		return got_error_from_errno("reallocarray");
8928 	}
8929 
8930 	*line_offsets = p;
8931 	(*line_offsets)[*nlines] = off;
8932 	++(*nlines);
8933 	return NULL;
8934 }
8935 
8936 static const struct got_error *
8937 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8938 {
8939 	*ret = 0;
8940 
8941 	for (;n > 0; --n, ++km) {
8942 		char	*t0, *t, *k;
8943 		size_t	 len = 1;
8944 
8945 		if (km->keys == NULL)
8946 			continue;
8947 
8948 		t = t0 = strdup(km->keys);
8949 		if (t0 == NULL)
8950 			return got_error_from_errno("strdup");
8951 
8952 		len += strlen(t);
8953 		while ((k = strsep(&t, " ")) != NULL)
8954 			len += strlen(k) > 1 ? 2 : 0;
8955 		free(t0);
8956 		*ret = MAX(*ret, len);
8957 	}
8958 
8959 	return NULL;
8960 }
8961 
8962 /*
8963  * Write keymap section headers, keys, and key info in km to f.
8964  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8965  * wrap control and symbolic keys in guillemets, else use <>.
8966  */
8967 static const struct got_error *
8968 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8969 {
8970 	int n, len = width;
8971 
8972 	if (km->keys) {
8973 		static const char *u8_glyph[] = {
8974 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8975 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8976 		};
8977 		char	*t0, *t, *k;
8978 		int	 cs, s, first = 1;
8979 
8980 		cs = got_locale_is_utf8();
8981 
8982 		t = t0 = strdup(km->keys);
8983 		if (t0 == NULL)
8984 			return got_error_from_errno("strdup");
8985 
8986 		len = strlen(km->keys);
8987 		while ((k = strsep(&t, " ")) != NULL) {
8988 			s = strlen(k) > 1;  /* control or symbolic key */
8989 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8990 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8991 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8992 			if (n < 0) {
8993 				free(t0);
8994 				return got_error_from_errno("fprintf");
8995 			}
8996 			first = 0;
8997 			len += s ? 2 : 0;
8998 			*off += n;
8999 		}
9000 		free(t0);
9001 	}
9002 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9003 	if (n < 0)
9004 		return got_error_from_errno("fprintf");
9005 	*off += n;
9006 
9007 	return NULL;
9008 }
9009 
9010 static const struct got_error *
9011 format_help(struct tog_help_view_state *s)
9012 {
9013 	const struct got_error		*err = NULL;
9014 	off_t				 off = 0;
9015 	int				 i, max, n, show = s->all;
9016 	static const struct tog_key_map	 km[] = {
9017 #define KEYMAP_(info, type)	{ NULL, (info), type }
9018 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9019 		GENERATE_HELP
9020 #undef KEYMAP_
9021 #undef KEY_
9022 	};
9023 
9024 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9025 	if (err)
9026 		return err;
9027 
9028 	n = nitems(km);
9029 	err = max_key_str(&max, km, n);
9030 	if (err)
9031 		return err;
9032 
9033 	for (i = 0; i < n; ++i) {
9034 		if (km[i].keys == NULL) {
9035 			show = s->all;
9036 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9037 			    km[i].type == s->type || s->all)
9038 				show = 1;
9039 		}
9040 		if (show) {
9041 			err = format_help_line(&off, s->f, &km[i], max);
9042 			if (err)
9043 				return err;
9044 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9045 			if (err)
9046 				return err;
9047 		}
9048 	}
9049 	fputc('\n', s->f);
9050 	++off;
9051 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9052 	return err;
9053 }
9054 
9055 static const struct got_error *
9056 create_help(struct tog_help_view_state *s)
9057 {
9058 	FILE			*f;
9059 	const struct got_error	*err;
9060 
9061 	free(s->line_offsets);
9062 	s->line_offsets = NULL;
9063 	s->nlines = 0;
9064 
9065 	f = got_opentemp();
9066 	if (f == NULL)
9067 		return got_error_from_errno("got_opentemp");
9068 	s->f = f;
9069 
9070 	err = format_help(s);
9071 	if (err)
9072 		return err;
9073 
9074 	if (s->f && fflush(s->f) != 0)
9075 		return got_error_from_errno("fflush");
9076 
9077 	return NULL;
9078 }
9079 
9080 static const struct got_error *
9081 search_start_help_view(struct tog_view *view)
9082 {
9083 	view->state.help.matched_line = 0;
9084 	return NULL;
9085 }
9086 
9087 static void
9088 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9089     size_t *nlines, int **first, int **last, int **match, int **selected)
9090 {
9091 	struct tog_help_view_state *s = &view->state.help;
9092 
9093 	*f = s->f;
9094 	*nlines = s->nlines;
9095 	*line_offsets = s->line_offsets;
9096 	*match = &s->matched_line;
9097 	*first = &s->first_displayed_line;
9098 	*last = &s->last_displayed_line;
9099 	*selected = &s->selected_line;
9100 }
9101 
9102 static const struct got_error *
9103 show_help_view(struct tog_view *view)
9104 {
9105 	struct tog_help_view_state	*s = &view->state.help;
9106 	const struct got_error		*err;
9107 	regmatch_t			*regmatch = &view->regmatch;
9108 	wchar_t				*wline;
9109 	char				*line;
9110 	ssize_t				 linelen;
9111 	size_t				 linesz = 0;
9112 	int				 width, nprinted = 0, rc = 0;
9113 	int				 eos = view->nlines;
9114 
9115 	if (view_is_hsplit_top(view))
9116 		--eos;  /* account for border */
9117 
9118 	s->lineno = 0;
9119 	rewind(s->f);
9120 	werase(view->window);
9121 
9122 	if (view->gline > s->nlines - 1)
9123 		view->gline = s->nlines - 1;
9124 
9125 	err = win_draw_center(view->window, 0, 0, view->ncols,
9126 	    view_needs_focus_indication(view),
9127 	    "tog help (press q to return to tog)");
9128 	if (err)
9129 		return err;
9130 	if (eos <= 1)
9131 		return NULL;
9132 	waddstr(view->window, "\n\n");
9133 	eos -= 2;
9134 
9135 	s->eof = 0;
9136 	view->maxx = 0;
9137 	line = NULL;
9138 	while (eos > 0 && nprinted < eos) {
9139 		attr_t attr = 0;
9140 
9141 		linelen = getline(&line, &linesz, s->f);
9142 		if (linelen == -1) {
9143 			if (!feof(s->f)) {
9144 				free(line);
9145 				return got_ferror(s->f, GOT_ERR_IO);
9146 			}
9147 			s->eof = 1;
9148 			break;
9149 		}
9150 		if (++s->lineno < s->first_displayed_line)
9151 			continue;
9152 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9153 			continue;
9154 		if (s->lineno == view->hiline)
9155 			attr = A_STANDOUT;
9156 
9157 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9158 		    view->x ? 1 : 0);
9159 		if (err) {
9160 			free(line);
9161 			return err;
9162 		}
9163 		view->maxx = MAX(view->maxx, width);
9164 		free(wline);
9165 		wline = NULL;
9166 
9167 		if (attr)
9168 			wattron(view->window, attr);
9169 		if (s->first_displayed_line + nprinted == s->matched_line &&
9170 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9171 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9172 			    view->window, view->x, regmatch);
9173 			if (err) {
9174 				free(line);
9175 				return err;
9176 			}
9177 		} else {
9178 			int skip;
9179 
9180 			err = format_line(&wline, &width, &skip, line,
9181 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9182 			if (err) {
9183 				free(line);
9184 				return err;
9185 			}
9186 			waddwstr(view->window, &wline[skip]);
9187 			free(wline);
9188 			wline = NULL;
9189 		}
9190 		if (s->lineno == view->hiline) {
9191 			while (width++ < view->ncols)
9192 				waddch(view->window, ' ');
9193 		} else {
9194 			if (width < view->ncols)
9195 				waddch(view->window, '\n');
9196 		}
9197 		if (attr)
9198 			wattroff(view->window, attr);
9199 		if (++nprinted == 1)
9200 			s->first_displayed_line = s->lineno;
9201 	}
9202 	free(line);
9203 	if (nprinted > 0)
9204 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9205 	else
9206 		s->last_displayed_line = s->first_displayed_line;
9207 
9208 	view_border(view);
9209 
9210 	if (s->eof) {
9211 		rc = waddnstr(view->window,
9212 		    "See the tog(1) manual page for full documentation",
9213 		    view->ncols - 1);
9214 		if (rc == ERR)
9215 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9216 	} else {
9217 		wmove(view->window, view->nlines - 1, 0);
9218 		wclrtoeol(view->window);
9219 		wstandout(view->window);
9220 		rc = waddnstr(view->window, "scroll down for more...",
9221 		    view->ncols - 1);
9222 		if (rc == ERR)
9223 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9224 		if (getcurx(view->window) < view->ncols - 6) {
9225 			rc = wprintw(view->window, "[%.0f%%]",
9226 			    100.00 * s->last_displayed_line / s->nlines);
9227 			if (rc == ERR)
9228 				return got_error_msg(GOT_ERR_IO, "wprintw");
9229 		}
9230 		wstandend(view->window);
9231 	}
9232 
9233 	return NULL;
9234 }
9235 
9236 static const struct got_error *
9237 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9238 {
9239 	struct tog_help_view_state	*s = &view->state.help;
9240 	const struct got_error		*err = NULL;
9241 	char				*line = NULL;
9242 	ssize_t				 linelen;
9243 	size_t				 linesz = 0;
9244 	int				 eos, nscroll;
9245 
9246 	eos = nscroll = view->nlines;
9247 	if (view_is_hsplit_top(view))
9248 		--eos;  /* border */
9249 
9250 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9251 
9252 	switch (ch) {
9253 	case '0':
9254 	case '$':
9255 	case KEY_RIGHT:
9256 	case 'l':
9257 	case KEY_LEFT:
9258 	case 'h':
9259 		horizontal_scroll_input(view, ch);
9260 		break;
9261 	case 'g':
9262 	case KEY_HOME:
9263 		s->first_displayed_line = 1;
9264 		view->count = 0;
9265 		break;
9266 	case 'G':
9267 	case KEY_END:
9268 		view->count = 0;
9269 		if (s->eof)
9270 			break;
9271 		s->first_displayed_line = (s->nlines - eos) + 3;
9272 		s->eof = 1;
9273 		break;
9274 	case 'k':
9275 	case KEY_UP:
9276 		if (s->first_displayed_line > 1)
9277 			--s->first_displayed_line;
9278 		else
9279 			view->count = 0;
9280 		break;
9281 	case CTRL('u'):
9282 	case 'u':
9283 		nscroll /= 2;
9284 		/* FALL THROUGH */
9285 	case KEY_PPAGE:
9286 	case CTRL('b'):
9287 	case 'b':
9288 		if (s->first_displayed_line == 1) {
9289 			view->count = 0;
9290 			break;
9291 		}
9292 		while (--nscroll > 0 && s->first_displayed_line > 1)
9293 			s->first_displayed_line--;
9294 		break;
9295 	case 'j':
9296 	case KEY_DOWN:
9297 	case CTRL('n'):
9298 		if (!s->eof)
9299 			++s->first_displayed_line;
9300 		else
9301 			view->count = 0;
9302 		break;
9303 	case CTRL('d'):
9304 	case 'd':
9305 		nscroll /= 2;
9306 		/* FALL THROUGH */
9307 	case KEY_NPAGE:
9308 	case CTRL('f'):
9309 	case 'f':
9310 	case ' ':
9311 		if (s->eof) {
9312 			view->count = 0;
9313 			break;
9314 		}
9315 		while (!s->eof && --nscroll > 0) {
9316 			linelen = getline(&line, &linesz, s->f);
9317 			s->first_displayed_line++;
9318 			if (linelen == -1) {
9319 				if (feof(s->f))
9320 					s->eof = 1;
9321 				else
9322 					err = got_ferror(s->f, GOT_ERR_IO);
9323 				break;
9324 			}
9325 		}
9326 		free(line);
9327 		break;
9328 	default:
9329 		view->count = 0;
9330 		break;
9331 	}
9332 
9333 	return err;
9334 }
9335 
9336 static const struct got_error *
9337 close_help_view(struct tog_view *view)
9338 {
9339 	struct tog_help_view_state *s = &view->state.help;
9340 
9341 	free(s->line_offsets);
9342 	s->line_offsets = NULL;
9343 	if (fclose(s->f) == EOF)
9344 		return got_error_from_errno("fclose");
9345 
9346 	return NULL;
9347 }
9348 
9349 static const struct got_error *
9350 reset_help_view(struct tog_view *view)
9351 {
9352 	struct tog_help_view_state *s = &view->state.help;
9353 
9354 
9355 	if (s->f && fclose(s->f) == EOF)
9356 		return got_error_from_errno("fclose");
9357 
9358 	wclear(view->window);
9359 	view->count = 0;
9360 	view->x = 0;
9361 	s->all = !s->all;
9362 	s->first_displayed_line = 1;
9363 	s->last_displayed_line = view->nlines;
9364 	s->matched_line = 0;
9365 
9366 	return create_help(s);
9367 }
9368 
9369 static const struct got_error *
9370 open_help_view(struct tog_view *view, struct tog_view *parent)
9371 {
9372 	const struct got_error		*err = NULL;
9373 	struct tog_help_view_state	*s = &view->state.help;
9374 
9375 	s->type = (enum tog_keymap_type)parent->type;
9376 	s->first_displayed_line = 1;
9377 	s->last_displayed_line = view->nlines;
9378 	s->selected_line = 1;
9379 
9380 	view->show = show_help_view;
9381 	view->input = input_help_view;
9382 	view->reset = reset_help_view;
9383 	view->close = close_help_view;
9384 	view->search_start = search_start_help_view;
9385 	view->search_setup = search_setup_help_view;
9386 	view->search_next = search_next_view_match;
9387 
9388 	err = create_help(s);
9389 	return err;
9390 }
9391 
9392 static const struct got_error *
9393 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9394     enum tog_view_type request, int y, int x)
9395 {
9396 	const struct got_error *err = NULL;
9397 
9398 	*new_view = NULL;
9399 
9400 	switch (request) {
9401 	case TOG_VIEW_DIFF:
9402 		if (view->type == TOG_VIEW_LOG) {
9403 			struct tog_log_view_state *s = &view->state.log;
9404 
9405 			err = open_diff_view_for_commit(new_view, y, x,
9406 			    s->selected_entry->commit, s->selected_entry->id,
9407 			    view, s->repo);
9408 		} else
9409 			return got_error_msg(GOT_ERR_NOT_IMPL,
9410 			    "parent/child view pair not supported");
9411 		break;
9412 	case TOG_VIEW_BLAME:
9413 		if (view->type == TOG_VIEW_TREE) {
9414 			struct tog_tree_view_state *s = &view->state.tree;
9415 
9416 			err = blame_tree_entry(new_view, y, x,
9417 			    s->selected_entry, &s->parents, s->commit_id,
9418 			    s->repo);
9419 		} else
9420 			return got_error_msg(GOT_ERR_NOT_IMPL,
9421 			    "parent/child view pair not supported");
9422 		break;
9423 	case TOG_VIEW_LOG:
9424 		if (view->type == TOG_VIEW_BLAME)
9425 			err = log_annotated_line(new_view, y, x,
9426 			    view->state.blame.repo, view->state.blame.id_to_log);
9427 		else if (view->type == TOG_VIEW_TREE)
9428 			err = log_selected_tree_entry(new_view, y, x,
9429 			    &view->state.tree);
9430 		else if (view->type == TOG_VIEW_REF)
9431 			err = log_ref_entry(new_view, y, x,
9432 			    view->state.ref.selected_entry,
9433 			    view->state.ref.repo);
9434 		else
9435 			return got_error_msg(GOT_ERR_NOT_IMPL,
9436 			    "parent/child view pair not supported");
9437 		break;
9438 	case TOG_VIEW_TREE:
9439 		if (view->type == TOG_VIEW_LOG)
9440 			err = browse_commit_tree(new_view, y, x,
9441 			    view->state.log.selected_entry,
9442 			    view->state.log.in_repo_path,
9443 			    view->state.log.head_ref_name,
9444 			    view->state.log.repo);
9445 		else if (view->type == TOG_VIEW_REF)
9446 			err = browse_ref_tree(new_view, y, x,
9447 			    view->state.ref.selected_entry,
9448 			    view->state.ref.repo);
9449 		else
9450 			return got_error_msg(GOT_ERR_NOT_IMPL,
9451 			    "parent/child view pair not supported");
9452 		break;
9453 	case TOG_VIEW_REF:
9454 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9455 		if (*new_view == NULL)
9456 			return got_error_from_errno("view_open");
9457 		if (view->type == TOG_VIEW_LOG)
9458 			err = open_ref_view(*new_view, view->state.log.repo);
9459 		else if (view->type == TOG_VIEW_TREE)
9460 			err = open_ref_view(*new_view, view->state.tree.repo);
9461 		else
9462 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9463 			    "parent/child view pair not supported");
9464 		if (err)
9465 			view_close(*new_view);
9466 		break;
9467 	case TOG_VIEW_HELP:
9468 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9469 		if (*new_view == NULL)
9470 			return got_error_from_errno("view_open");
9471 		err = open_help_view(*new_view, view);
9472 		if (err)
9473 			view_close(*new_view);
9474 		break;
9475 	default:
9476 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9477 	}
9478 
9479 	return err;
9480 }
9481 
9482 /*
9483  * If view was scrolled down to move the selected line into view when opening a
9484  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9485  */
9486 static void
9487 offset_selection_up(struct tog_view *view)
9488 {
9489 	switch (view->type) {
9490 	case TOG_VIEW_BLAME: {
9491 		struct tog_blame_view_state *s = &view->state.blame;
9492 		if (s->first_displayed_line == 1) {
9493 			s->selected_line = MAX(s->selected_line - view->offset,
9494 			    1);
9495 			break;
9496 		}
9497 		if (s->first_displayed_line > view->offset)
9498 			s->first_displayed_line -= view->offset;
9499 		else
9500 			s->first_displayed_line = 1;
9501 		s->selected_line += view->offset;
9502 		break;
9503 	}
9504 	case TOG_VIEW_LOG:
9505 		log_scroll_up(&view->state.log, view->offset);
9506 		view->state.log.selected += view->offset;
9507 		break;
9508 	case TOG_VIEW_REF:
9509 		ref_scroll_up(&view->state.ref, view->offset);
9510 		view->state.ref.selected += view->offset;
9511 		break;
9512 	case TOG_VIEW_TREE:
9513 		tree_scroll_up(&view->state.tree, view->offset);
9514 		view->state.tree.selected += view->offset;
9515 		break;
9516 	default:
9517 		break;
9518 	}
9519 
9520 	view->offset = 0;
9521 }
9522 
9523 /*
9524  * If the selected line is in the section of screen covered by the bottom split,
9525  * scroll down offset lines to move it into view and index its new position.
9526  */
9527 static const struct got_error *
9528 offset_selection_down(struct tog_view *view)
9529 {
9530 	const struct got_error	*err = NULL;
9531 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9532 	int			*selected = NULL;
9533 	int			 header, offset;
9534 
9535 	switch (view->type) {
9536 	case TOG_VIEW_BLAME: {
9537 		struct tog_blame_view_state *s = &view->state.blame;
9538 		header = 3;
9539 		scrolld = NULL;
9540 		if (s->selected_line > view->nlines - header) {
9541 			offset = abs(view->nlines - s->selected_line - header);
9542 			s->first_displayed_line += offset;
9543 			s->selected_line -= offset;
9544 			view->offset = offset;
9545 		}
9546 		break;
9547 	}
9548 	case TOG_VIEW_LOG: {
9549 		struct tog_log_view_state *s = &view->state.log;
9550 		scrolld = &log_scroll_down;
9551 		header = view_is_parent_view(view) ? 3 : 2;
9552 		selected = &s->selected;
9553 		break;
9554 	}
9555 	case TOG_VIEW_REF: {
9556 		struct tog_ref_view_state *s = &view->state.ref;
9557 		scrolld = &ref_scroll_down;
9558 		header = 3;
9559 		selected = &s->selected;
9560 		break;
9561 	}
9562 	case TOG_VIEW_TREE: {
9563 		struct tog_tree_view_state *s = &view->state.tree;
9564 		scrolld = &tree_scroll_down;
9565 		header = 5;
9566 		selected = &s->selected;
9567 		break;
9568 	}
9569 	default:
9570 		selected = NULL;
9571 		scrolld = NULL;
9572 		header = 0;
9573 		break;
9574 	}
9575 
9576 	if (selected && *selected > view->nlines - header) {
9577 		offset = abs(view->nlines - *selected - header);
9578 		view->offset = offset;
9579 		if (scrolld && offset) {
9580 			err = scrolld(view, offset);
9581 			*selected -= offset;
9582 		}
9583 	}
9584 
9585 	return err;
9586 }
9587 
9588 static void
9589 list_commands(FILE *fp)
9590 {
9591 	size_t i;
9592 
9593 	fprintf(fp, "commands:");
9594 	for (i = 0; i < nitems(tog_commands); i++) {
9595 		const struct tog_cmd *cmd = &tog_commands[i];
9596 		fprintf(fp, " %s", cmd->name);
9597 	}
9598 	fputc('\n', fp);
9599 }
9600 
9601 __dead static void
9602 usage(int hflag, int status)
9603 {
9604 	FILE *fp = (status == 0) ? stdout : stderr;
9605 
9606 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9607 	    getprogname());
9608 	if (hflag) {
9609 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9610 		list_commands(fp);
9611 	}
9612 	exit(status);
9613 }
9614 
9615 static char **
9616 make_argv(int argc, ...)
9617 {
9618 	va_list ap;
9619 	char **argv;
9620 	int i;
9621 
9622 	va_start(ap, argc);
9623 
9624 	argv = calloc(argc, sizeof(char *));
9625 	if (argv == NULL)
9626 		err(1, "calloc");
9627 	for (i = 0; i < argc; i++) {
9628 		argv[i] = strdup(va_arg(ap, char *));
9629 		if (argv[i] == NULL)
9630 			err(1, "strdup");
9631 	}
9632 
9633 	va_end(ap);
9634 	return argv;
9635 }
9636 
9637 /*
9638  * Try to convert 'tog path' into a 'tog log path' command.
9639  * The user could simply have mistyped the command rather than knowingly
9640  * provided a path. So check whether argv[0] can in fact be resolved
9641  * to a path in the HEAD commit and print a special error if not.
9642  * This hack is for mpi@ <3
9643  */
9644 static const struct got_error *
9645 tog_log_with_path(int argc, char *argv[])
9646 {
9647 	const struct got_error *error = NULL, *close_err;
9648 	const struct tog_cmd *cmd = NULL;
9649 	struct got_repository *repo = NULL;
9650 	struct got_worktree *worktree = NULL;
9651 	struct got_object_id *commit_id = NULL, *id = NULL;
9652 	struct got_commit_object *commit = NULL;
9653 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9654 	char *commit_id_str = NULL, **cmd_argv = NULL;
9655 	int *pack_fds = NULL;
9656 
9657 	cwd = getcwd(NULL, 0);
9658 	if (cwd == NULL)
9659 		return got_error_from_errno("getcwd");
9660 
9661 	error = got_repo_pack_fds_open(&pack_fds);
9662 	if (error != NULL)
9663 		goto done;
9664 
9665 	error = got_worktree_open(&worktree, cwd);
9666 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9667 		goto done;
9668 
9669 	if (worktree)
9670 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9671 	else
9672 		repo_path = strdup(cwd);
9673 	if (repo_path == NULL) {
9674 		error = got_error_from_errno("strdup");
9675 		goto done;
9676 	}
9677 
9678 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9679 	if (error != NULL)
9680 		goto done;
9681 
9682 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9683 	    repo, worktree);
9684 	if (error)
9685 		goto done;
9686 
9687 	error = tog_load_refs(repo, 0);
9688 	if (error)
9689 		goto done;
9690 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9691 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9692 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9693 	if (error)
9694 		goto done;
9695 
9696 	if (worktree) {
9697 		got_worktree_close(worktree);
9698 		worktree = NULL;
9699 	}
9700 
9701 	error = got_object_open_as_commit(&commit, repo, commit_id);
9702 	if (error)
9703 		goto done;
9704 
9705 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9706 	if (error) {
9707 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9708 			goto done;
9709 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9710 		    getprogname(), argv[0]);
9711 		usage(1, 1);
9712 		/* not reached */
9713 	}
9714 
9715 	error = got_object_id_str(&commit_id_str, commit_id);
9716 	if (error)
9717 		goto done;
9718 
9719 	cmd = &tog_commands[0]; /* log */
9720 	argc = 4;
9721 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9722 	error = cmd->cmd_main(argc, cmd_argv);
9723 done:
9724 	if (repo) {
9725 		close_err = got_repo_close(repo);
9726 		if (error == NULL)
9727 			error = close_err;
9728 	}
9729 	if (commit)
9730 		got_object_commit_close(commit);
9731 	if (worktree)
9732 		got_worktree_close(worktree);
9733 	if (pack_fds) {
9734 		const struct got_error *pack_err =
9735 		    got_repo_pack_fds_close(pack_fds);
9736 		if (error == NULL)
9737 			error = pack_err;
9738 	}
9739 	free(id);
9740 	free(commit_id_str);
9741 	free(commit_id);
9742 	free(cwd);
9743 	free(repo_path);
9744 	free(in_repo_path);
9745 	if (cmd_argv) {
9746 		int i;
9747 		for (i = 0; i < argc; i++)
9748 			free(cmd_argv[i]);
9749 		free(cmd_argv);
9750 	}
9751 	tog_free_refs();
9752 	return error;
9753 }
9754 
9755 int
9756 main(int argc, char *argv[])
9757 {
9758 	const struct got_error *error = NULL;
9759 	const struct tog_cmd *cmd = NULL;
9760 	int ch, hflag = 0, Vflag = 0;
9761 	char **cmd_argv = NULL;
9762 	static const struct option longopts[] = {
9763 	    { "version", no_argument, NULL, 'V' },
9764 	    { NULL, 0, NULL, 0}
9765 	};
9766 	char *diff_algo_str = NULL;
9767 
9768 	setlocale(LC_CTYPE, "");
9769 
9770 #if !defined(PROFILE) && !defined(TOG_REGRESS)
9771 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9772 	    NULL) == -1)
9773 		err(1, "pledge");
9774 #endif
9775 
9776 	if (!isatty(STDIN_FILENO))
9777 		errx(1, "standard input is not a tty");
9778 
9779 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9780 		switch (ch) {
9781 		case 'h':
9782 			hflag = 1;
9783 			break;
9784 		case 'V':
9785 			Vflag = 1;
9786 			break;
9787 		default:
9788 			usage(hflag, 1);
9789 			/* NOTREACHED */
9790 		}
9791 	}
9792 
9793 	argc -= optind;
9794 	argv += optind;
9795 	optind = 1;
9796 	optreset = 1;
9797 
9798 	if (Vflag) {
9799 		got_version_print_str();
9800 		return 0;
9801 	}
9802 
9803 	if (argc == 0) {
9804 		if (hflag)
9805 			usage(hflag, 0);
9806 		/* Build an argument vector which runs a default command. */
9807 		cmd = &tog_commands[0];
9808 		argc = 1;
9809 		cmd_argv = make_argv(argc, cmd->name);
9810 	} else {
9811 		size_t i;
9812 
9813 		/* Did the user specify a command? */
9814 		for (i = 0; i < nitems(tog_commands); i++) {
9815 			if (strncmp(tog_commands[i].name, argv[0],
9816 			    strlen(argv[0])) == 0) {
9817 				cmd = &tog_commands[i];
9818 				break;
9819 			}
9820 		}
9821 	}
9822 
9823 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9824 	if (diff_algo_str) {
9825 		if (strcasecmp(diff_algo_str, "patience") == 0)
9826 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9827 		if (strcasecmp(diff_algo_str, "myers") == 0)
9828 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9829 	}
9830 
9831 	if (cmd == NULL) {
9832 		if (argc != 1)
9833 			usage(0, 1);
9834 		/* No command specified; try log with a path */
9835 		error = tog_log_with_path(argc, argv);
9836 	} else {
9837 		if (hflag)
9838 			cmd->cmd_usage();
9839 		else
9840 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9841 	}
9842 
9843 	endwin();
9844 	if (cmd_argv) {
9845 		int i;
9846 		for (i = 0; i < argc; i++)
9847 			free(cmd_argv[i]);
9848 		free(cmd_argv);
9849 	}
9850 
9851 	if (error && error->code != GOT_ERR_CANCELLED &&
9852 	    error->code != GOT_ERR_EOF &&
9853 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9854 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9855 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9856 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9857 	return 0;
9858 }