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	0.3f  /* 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 	pthread_cond_t blame_complete;
440 };
441 
442 struct tog_blame {
443 	FILE *f;
444 	off_t filesize;
445 	struct tog_blame_line *lines;
446 	int nlines;
447 	off_t *line_offsets;
448 	pthread_t thread;
449 	struct tog_blame_thread_args thread_args;
450 	struct tog_blame_cb_args cb_args;
451 	const char *path;
452 	int *pack_fds;
453 };
454 
455 struct tog_blame_view_state {
456 	int first_displayed_line;
457 	int last_displayed_line;
458 	int selected_line;
459 	int last_diffed_line;
460 	int blame_complete;
461 	int eof;
462 	int done;
463 	struct got_object_id_queue blamed_commits;
464 	struct got_object_qid *blamed_commit;
465 	char *path;
466 	struct got_repository *repo;
467 	struct got_object_id *commit_id;
468 	struct got_object_id *id_to_log;
469 	struct tog_blame blame;
470 	int matched_line;
471 	struct tog_colors colors;
472 };
473 
474 struct tog_parent_tree {
475 	TAILQ_ENTRY(tog_parent_tree) entry;
476 	struct got_tree_object *tree;
477 	struct got_tree_entry *first_displayed_entry;
478 	struct got_tree_entry *selected_entry;
479 	int selected;
480 };
481 
482 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
483 
484 struct tog_tree_view_state {
485 	char *tree_label;
486 	struct got_object_id *commit_id;/* commit which this tree belongs to */
487 	struct got_tree_object *root;	/* the commit's root tree entry */
488 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
489 	struct got_tree_entry *first_displayed_entry;
490 	struct got_tree_entry *last_displayed_entry;
491 	struct got_tree_entry *selected_entry;
492 	int ndisplayed, selected, show_ids;
493 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
494 	char *head_ref_name;
495 	struct got_repository *repo;
496 	struct got_tree_entry *matched_entry;
497 	struct tog_colors colors;
498 };
499 
500 struct tog_reflist_entry {
501 	TAILQ_ENTRY(tog_reflist_entry) entry;
502 	struct got_reference *ref;
503 	int idx;
504 };
505 
506 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
507 
508 struct tog_ref_view_state {
509 	struct tog_reflist_head refs;
510 	struct tog_reflist_entry *first_displayed_entry;
511 	struct tog_reflist_entry *last_displayed_entry;
512 	struct tog_reflist_entry *selected_entry;
513 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
514 	struct got_repository *repo;
515 	struct tog_reflist_entry *matched_entry;
516 	struct tog_colors colors;
517 };
518 
519 struct tog_help_view_state {
520 	FILE			*f;
521 	off_t			*line_offsets;
522 	size_t			 nlines;
523 	int			 lineno;
524 	int			 first_displayed_line;
525 	int			 last_displayed_line;
526 	int			 eof;
527 	int			 matched_line;
528 	int			 selected_line;
529 	int			 all;
530 	enum tog_keymap_type	 type;
531 };
532 
533 #define GENERATE_HELP \
534 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
535 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
536 	KEY_("k C-p Up", "Move cursor or page up one line"), \
537 	KEY_("j C-n Down", "Move cursor or page down one line"), \
538 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
539 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
540 	KEY_("C-u u", "Scroll the view up one half page"), \
541 	KEY_("C-d d", "Scroll the view down one half page"), \
542 	KEY_("g", "Go to line N (default: first line)"), \
543 	KEY_("Home =", "Go to the first line"), \
544 	KEY_("G", "Go to line N (default: last line)"), \
545 	KEY_("End *", "Go to the last line"), \
546 	KEY_("l Right", "Scroll the view right"), \
547 	KEY_("h Left", "Scroll the view left"), \
548 	KEY_("$", "Scroll view to the rightmost position"), \
549 	KEY_("0", "Scroll view to the leftmost position"), \
550 	KEY_("-", "Decrease size of the focussed split"), \
551 	KEY_("+", "Increase size of the focussed split"), \
552 	KEY_("Tab", "Switch focus between views"), \
553 	KEY_("F", "Toggle fullscreen mode"), \
554 	KEY_("S", "Switch split-screen layout"), \
555 	KEY_("/", "Open prompt to enter search term"), \
556 	KEY_("n", "Find next line/token matching the current search term"), \
557 	KEY_("N", "Find previous line/token matching the current search term"),\
558 	KEY_("q", "Quit the focussed view; Quit help screen"), \
559 	KEY_("Q", "Quit tog"), \
560 	\
561 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
562 	KEY_("< ,", "Move cursor up one commit"), \
563 	KEY_("> .", "Move cursor down one commit"), \
564 	KEY_("Enter", "Open diff view of the selected commit"), \
565 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
566 	KEY_("R", "Open ref view of all repository references"), \
567 	KEY_("T", "Display tree view of the repository from the selected" \
568 	    " commit"), \
569 	KEY_("@", "Toggle between displaying author and committer name"), \
570 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
571 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
572 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
573 	\
574 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
575 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
576 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
577 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
578 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
579 	    " data"), \
580 	KEY_("(", "Go to the previous file in the diff"), \
581 	KEY_(")", "Go to the next file in the diff"), \
582 	KEY_("{", "Go to the previous hunk in the diff"), \
583 	KEY_("}", "Go to the next hunk in the diff"), \
584 	KEY_("[", "Decrease the number of context lines"), \
585 	KEY_("]", "Increase the number of context lines"), \
586 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
587 	\
588 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
589 	KEY_("Enter", "Display diff view of the selected line's commit"), \
590 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
591 	KEY_("L", "Open log view for the currently selected annotated line"), \
592 	KEY_("C", "Reload view with the previously blamed commit"), \
593 	KEY_("c", "Reload view with the version of the file found in the" \
594 	    " selected line's commit"), \
595 	KEY_("p", "Reload view with the version of the file found in the" \
596 	    " selected line's parent commit"), \
597 	\
598 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
599 	KEY_("Enter", "Enter selected directory or open blame view of the" \
600 	    " selected file"), \
601 	KEY_("L", "Open log view for the selected entry"), \
602 	KEY_("R", "Open ref view of all repository references"), \
603 	KEY_("i", "Show object IDs for all tree entries"), \
604 	KEY_("Backspace", "Return to the parent directory"), \
605 	\
606 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
607 	KEY_("Enter", "Display log view of the selected reference"), \
608 	KEY_("T", "Display tree view of the selected reference"), \
609 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
610 	KEY_("m", "Toggle display of last modified date for each reference"), \
611 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
612 	KEY_("C-l", "Reload view with all repository references")
613 
614 struct tog_key_map {
615 	const char		*keys;
616 	const char		*info;
617 	enum tog_keymap_type	 type;
618 };
619 
620 /* curses io for tog regress */
621 struct tog_io {
622 	FILE	*cin;
623 	FILE	*cout;
624 	FILE	*f;
625 	FILE	*sdump;
626 	int	 wait_for_ui;
627 } tog_io;
628 static int using_mock_io;
629 
630 #define TOG_KEY_SCRDUMP	SHRT_MIN
631 
632 /*
633  * We implement two types of views: parent views and child views.
634  *
635  * The 'Tab' key switches focus between a parent view and its child view.
636  * Child views are shown side-by-side to their parent view, provided
637  * there is enough screen estate.
638  *
639  * When a new view is opened from within a parent view, this new view
640  * becomes a child view of the parent view, replacing any existing child.
641  *
642  * When a new view is opened from within a child view, this new view
643  * becomes a parent view which will obscure the views below until the
644  * user quits the new parent view by typing 'q'.
645  *
646  * This list of views contains parent views only.
647  * Child views are only pointed to by their parent view.
648  */
649 TAILQ_HEAD(tog_view_list_head, tog_view);
650 
651 struct tog_view {
652 	TAILQ_ENTRY(tog_view) entry;
653 	WINDOW *window;
654 	PANEL *panel;
655 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
656 	int resized_y, resized_x; /* begin_y/x based on user resizing */
657 	int maxx, x; /* max column and current start column */
658 	int lines, cols; /* copies of LINES and COLS */
659 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
660 	int gline, hiline; /* navigate to and highlight this nG line */
661 	int ch, count; /* current keymap and count prefix */
662 	int resized; /* set when in a resize event */
663 	int focussed; /* Only set on one parent or child view at a time. */
664 	int dying;
665 	struct tog_view *parent;
666 	struct tog_view *child;
667 
668 	/*
669 	 * This flag is initially set on parent views when a new child view
670 	 * is created. It gets toggled when the 'Tab' key switches focus
671 	 * between parent and child.
672 	 * The flag indicates whether focus should be passed on to our child
673 	 * view if this parent view gets picked for focus after another parent
674 	 * view was closed. This prevents child views from losing focus in such
675 	 * situations.
676 	 */
677 	int focus_child;
678 
679 	enum tog_view_mode mode;
680 	/* type-specific state */
681 	enum tog_view_type type;
682 	union {
683 		struct tog_diff_view_state diff;
684 		struct tog_log_view_state log;
685 		struct tog_blame_view_state blame;
686 		struct tog_tree_view_state tree;
687 		struct tog_ref_view_state ref;
688 		struct tog_help_view_state help;
689 	} state;
690 
691 	const struct got_error *(*show)(struct tog_view *);
692 	const struct got_error *(*input)(struct tog_view **,
693 	    struct tog_view *, int);
694 	const struct got_error *(*reset)(struct tog_view *);
695 	const struct got_error *(*resize)(struct tog_view *, int);
696 	const struct got_error *(*close)(struct tog_view *);
697 
698 	const struct got_error *(*search_start)(struct tog_view *);
699 	const struct got_error *(*search_next)(struct tog_view *);
700 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
701 	    int **, int **, int **, int **);
702 	int search_started;
703 	int searching;
704 #define TOG_SEARCH_FORWARD	1
705 #define TOG_SEARCH_BACKWARD	2
706 	int search_next_done;
707 #define TOG_SEARCH_HAVE_MORE	1
708 #define TOG_SEARCH_NO_MORE	2
709 #define TOG_SEARCH_HAVE_NONE	3
710 	regex_t regex;
711 	regmatch_t regmatch;
712 	const char *action;
713 };
714 
715 static const struct got_error *open_diff_view(struct tog_view *,
716     struct got_object_id *, struct got_object_id *,
717     const char *, const char *, int, int, int, struct tog_view *,
718     struct got_repository *);
719 static const struct got_error *show_diff_view(struct tog_view *);
720 static const struct got_error *input_diff_view(struct tog_view **,
721     struct tog_view *, int);
722 static const struct got_error *reset_diff_view(struct tog_view *);
723 static const struct got_error* close_diff_view(struct tog_view *);
724 static const struct got_error *search_start_diff_view(struct tog_view *);
725 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
726     size_t *, int **, int **, int **, int **);
727 static const struct got_error *search_next_view_match(struct tog_view *);
728 
729 static const struct got_error *open_log_view(struct tog_view *,
730     struct got_object_id *, struct got_repository *,
731     const char *, const char *, int);
732 static const struct got_error * show_log_view(struct tog_view *);
733 static const struct got_error *input_log_view(struct tog_view **,
734     struct tog_view *, int);
735 static const struct got_error *resize_log_view(struct tog_view *, int);
736 static const struct got_error *close_log_view(struct tog_view *);
737 static const struct got_error *search_start_log_view(struct tog_view *);
738 static const struct got_error *search_next_log_view(struct tog_view *);
739 
740 static const struct got_error *open_blame_view(struct tog_view *, char *,
741     struct got_object_id *, struct got_repository *);
742 static const struct got_error *show_blame_view(struct tog_view *);
743 static const struct got_error *input_blame_view(struct tog_view **,
744     struct tog_view *, int);
745 static const struct got_error *reset_blame_view(struct tog_view *);
746 static const struct got_error *close_blame_view(struct tog_view *);
747 static const struct got_error *search_start_blame_view(struct tog_view *);
748 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
749     size_t *, int **, int **, int **, int **);
750 
751 static const struct got_error *open_tree_view(struct tog_view *,
752     struct got_object_id *, const char *, struct got_repository *);
753 static const struct got_error *show_tree_view(struct tog_view *);
754 static const struct got_error *input_tree_view(struct tog_view **,
755     struct tog_view *, int);
756 static const struct got_error *close_tree_view(struct tog_view *);
757 static const struct got_error *search_start_tree_view(struct tog_view *);
758 static const struct got_error *search_next_tree_view(struct tog_view *);
759 
760 static const struct got_error *open_ref_view(struct tog_view *,
761     struct got_repository *);
762 static const struct got_error *show_ref_view(struct tog_view *);
763 static const struct got_error *input_ref_view(struct tog_view **,
764     struct tog_view *, int);
765 static const struct got_error *close_ref_view(struct tog_view *);
766 static const struct got_error *search_start_ref_view(struct tog_view *);
767 static const struct got_error *search_next_ref_view(struct tog_view *);
768 
769 static const struct got_error *open_help_view(struct tog_view *,
770     struct tog_view *);
771 static const struct got_error *show_help_view(struct tog_view *);
772 static const struct got_error *input_help_view(struct tog_view **,
773     struct tog_view *, int);
774 static const struct got_error *reset_help_view(struct tog_view *);
775 static const struct got_error* close_help_view(struct tog_view *);
776 static const struct got_error *search_start_help_view(struct tog_view *);
777 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
778     size_t *, int **, int **, int **, int **);
779 
780 static volatile sig_atomic_t tog_sigwinch_received;
781 static volatile sig_atomic_t tog_sigpipe_received;
782 static volatile sig_atomic_t tog_sigcont_received;
783 static volatile sig_atomic_t tog_sigint_received;
784 static volatile sig_atomic_t tog_sigterm_received;
785 
786 static void
787 tog_sigwinch(int signo)
788 {
789 	tog_sigwinch_received = 1;
790 }
791 
792 static void
793 tog_sigpipe(int signo)
794 {
795 	tog_sigpipe_received = 1;
796 }
797 
798 static void
799 tog_sigcont(int signo)
800 {
801 	tog_sigcont_received = 1;
802 }
803 
804 static void
805 tog_sigint(int signo)
806 {
807 	tog_sigint_received = 1;
808 }
809 
810 static void
811 tog_sigterm(int signo)
812 {
813 	tog_sigterm_received = 1;
814 }
815 
816 static int
817 tog_fatal_signal_received(void)
818 {
819 	return (tog_sigpipe_received ||
820 	    tog_sigint_received || tog_sigterm_received);
821 }
822 
823 static const struct got_error *
824 view_close(struct tog_view *view)
825 {
826 	const struct got_error *err = NULL, *child_err = NULL;
827 
828 	if (view->child) {
829 		child_err = view_close(view->child);
830 		view->child = NULL;
831 	}
832 	if (view->close)
833 		err = view->close(view);
834 	if (view->panel)
835 		del_panel(view->panel);
836 	if (view->window)
837 		delwin(view->window);
838 	free(view);
839 	return err ? err : child_err;
840 }
841 
842 static struct tog_view *
843 view_open(int nlines, int ncols, int begin_y, int begin_x,
844     enum tog_view_type type)
845 {
846 	struct tog_view *view = calloc(1, sizeof(*view));
847 
848 	if (view == NULL)
849 		return NULL;
850 
851 	view->type = type;
852 	view->lines = LINES;
853 	view->cols = COLS;
854 	view->nlines = nlines ? nlines : LINES - begin_y;
855 	view->ncols = ncols ? ncols : COLS - begin_x;
856 	view->begin_y = begin_y;
857 	view->begin_x = begin_x;
858 	view->window = newwin(nlines, ncols, begin_y, begin_x);
859 	if (view->window == NULL) {
860 		view_close(view);
861 		return NULL;
862 	}
863 	view->panel = new_panel(view->window);
864 	if (view->panel == NULL ||
865 	    set_panel_userptr(view->panel, view) != OK) {
866 		view_close(view);
867 		return NULL;
868 	}
869 
870 	keypad(view->window, TRUE);
871 	return view;
872 }
873 
874 static int
875 view_split_begin_x(int begin_x)
876 {
877 	if (begin_x > 0 || COLS < 120)
878 		return 0;
879 	return (COLS - MAX(COLS / 2, 80));
880 }
881 
882 /* XXX Stub till we decide what to do. */
883 static int
884 view_split_begin_y(int lines)
885 {
886 	return lines * HSPLIT_SCALE;
887 }
888 
889 static const struct got_error *view_resize(struct tog_view *);
890 
891 static const struct got_error *
892 view_splitscreen(struct tog_view *view)
893 {
894 	const struct got_error *err = NULL;
895 
896 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
897 		if (view->resized_y && view->resized_y < view->lines)
898 			view->begin_y = view->resized_y;
899 		else
900 			view->begin_y = view_split_begin_y(view->nlines);
901 		view->begin_x = 0;
902 	} else if (!view->resized) {
903 		if (view->resized_x && view->resized_x < view->cols - 1 &&
904 		    view->cols > 119)
905 			view->begin_x = view->resized_x;
906 		else
907 			view->begin_x = view_split_begin_x(0);
908 		view->begin_y = 0;
909 	}
910 	view->nlines = LINES - view->begin_y;
911 	view->ncols = COLS - view->begin_x;
912 	view->lines = LINES;
913 	view->cols = COLS;
914 	err = view_resize(view);
915 	if (err)
916 		return err;
917 
918 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
919 		view->parent->nlines = view->begin_y;
920 
921 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
922 		return got_error_from_errno("mvwin");
923 
924 	return NULL;
925 }
926 
927 static const struct got_error *
928 view_fullscreen(struct tog_view *view)
929 {
930 	const struct got_error *err = NULL;
931 
932 	view->begin_x = 0;
933 	view->begin_y = view->resized ? view->begin_y : 0;
934 	view->nlines = view->resized ? view->nlines : LINES;
935 	view->ncols = COLS;
936 	view->lines = LINES;
937 	view->cols = COLS;
938 	err = view_resize(view);
939 	if (err)
940 		return err;
941 
942 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
943 		return got_error_from_errno("mvwin");
944 
945 	return NULL;
946 }
947 
948 static int
949 view_is_parent_view(struct tog_view *view)
950 {
951 	return view->parent == NULL;
952 }
953 
954 static int
955 view_is_splitscreen(struct tog_view *view)
956 {
957 	return view->begin_x > 0 || view->begin_y > 0;
958 }
959 
960 static int
961 view_is_fullscreen(struct tog_view *view)
962 {
963 	return view->nlines == LINES && view->ncols == COLS;
964 }
965 
966 static int
967 view_is_hsplit_top(struct tog_view *view)
968 {
969 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
970 	    view_is_splitscreen(view->child);
971 }
972 
973 static void
974 view_border(struct tog_view *view)
975 {
976 	PANEL *panel;
977 	const struct tog_view *view_above;
978 
979 	if (view->parent)
980 		return view_border(view->parent);
981 
982 	panel = panel_above(view->panel);
983 	if (panel == NULL)
984 		return;
985 
986 	view_above = panel_userptr(panel);
987 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
988 		mvwhline(view->window, view_above->begin_y - 1,
989 		    view->begin_x, ACS_HLINE, view->ncols);
990 	else
991 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
992 		    ACS_VLINE, view->nlines);
993 }
994 
995 static const struct got_error *view_init_hsplit(struct tog_view *, int);
996 static const struct got_error *request_log_commits(struct tog_view *);
997 static const struct got_error *offset_selection_down(struct tog_view *);
998 static void offset_selection_up(struct tog_view *);
999 static void view_get_split(struct tog_view *, int *, int *);
1000 
1001 static const struct got_error *
1002 view_resize(struct tog_view *view)
1003 {
1004 	const struct got_error	*err = NULL;
1005 	int			 dif, nlines, ncols;
1006 
1007 	dif = LINES - view->lines;  /* line difference */
1008 
1009 	if (view->lines > LINES)
1010 		nlines = view->nlines - (view->lines - LINES);
1011 	else
1012 		nlines = view->nlines + (LINES - view->lines);
1013 	if (view->cols > COLS)
1014 		ncols = view->ncols - (view->cols - COLS);
1015 	else
1016 		ncols = view->ncols + (COLS - view->cols);
1017 
1018 	if (view->child) {
1019 		int hs = view->child->begin_y;
1020 
1021 		if (!view_is_fullscreen(view))
1022 			view->child->begin_x = view_split_begin_x(view->begin_x);
1023 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1024 		    view->child->begin_x == 0) {
1025 			ncols = COLS;
1026 
1027 			view_fullscreen(view->child);
1028 			if (view->child->focussed)
1029 				show_panel(view->child->panel);
1030 			else
1031 				show_panel(view->panel);
1032 		} else {
1033 			ncols = view->child->begin_x;
1034 
1035 			view_splitscreen(view->child);
1036 			show_panel(view->child->panel);
1037 		}
1038 		/*
1039 		 * XXX This is ugly and needs to be moved into the above
1040 		 * logic but "works" for now and my attempts at moving it
1041 		 * break either 'tab' or 'F' key maps in horizontal splits.
1042 		 */
1043 		if (hs) {
1044 			err = view_splitscreen(view->child);
1045 			if (err)
1046 				return err;
1047 			if (dif < 0) { /* top split decreased */
1048 				err = offset_selection_down(view);
1049 				if (err)
1050 					return err;
1051 			}
1052 			view_border(view);
1053 			update_panels();
1054 			doupdate();
1055 			show_panel(view->child->panel);
1056 			nlines = view->nlines;
1057 		}
1058 	} else if (view->parent == NULL)
1059 		ncols = COLS;
1060 
1061 	if (view->resize && dif > 0) {
1062 		err = view->resize(view, dif);
1063 		if (err)
1064 			return err;
1065 	}
1066 
1067 	if (wresize(view->window, nlines, ncols) == ERR)
1068 		return got_error_from_errno("wresize");
1069 	if (replace_panel(view->panel, view->window) == ERR)
1070 		return got_error_from_errno("replace_panel");
1071 	wclear(view->window);
1072 
1073 	view->nlines = nlines;
1074 	view->ncols = ncols;
1075 	view->lines = LINES;
1076 	view->cols = COLS;
1077 
1078 	return NULL;
1079 }
1080 
1081 static const struct got_error *
1082 resize_log_view(struct tog_view *view, int increase)
1083 {
1084 	struct tog_log_view_state	*s = &view->state.log;
1085 	const struct got_error		*err = NULL;
1086 	int				 n = 0;
1087 
1088 	if (s->selected_entry)
1089 		n = s->selected_entry->idx + view->lines - s->selected;
1090 
1091 	/*
1092 	 * Request commits to account for the increased
1093 	 * height so we have enough to populate the view.
1094 	 */
1095 	if (s->commits->ncommits < n) {
1096 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1097 		err = request_log_commits(view);
1098 	}
1099 
1100 	return err;
1101 }
1102 
1103 static void
1104 view_adjust_offset(struct tog_view *view, int n)
1105 {
1106 	if (n == 0)
1107 		return;
1108 
1109 	if (view->parent && view->parent->offset) {
1110 		if (view->parent->offset + n >= 0)
1111 			view->parent->offset += n;
1112 		else
1113 			view->parent->offset = 0;
1114 	} else if (view->offset) {
1115 		if (view->offset - n >= 0)
1116 			view->offset -= n;
1117 		else
1118 			view->offset = 0;
1119 	}
1120 }
1121 
1122 static const struct got_error *
1123 view_resize_split(struct tog_view *view, int resize)
1124 {
1125 	const struct got_error	*err = NULL;
1126 	struct tog_view		*v = NULL;
1127 
1128 	if (view->parent)
1129 		v = view->parent;
1130 	else
1131 		v = view;
1132 
1133 	if (!v->child || !view_is_splitscreen(v->child))
1134 		return NULL;
1135 
1136 	v->resized = v->child->resized = resize;  /* lock for resize event */
1137 
1138 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1139 		if (v->child->resized_y)
1140 			v->child->begin_y = v->child->resized_y;
1141 		if (view->parent)
1142 			v->child->begin_y -= resize;
1143 		else
1144 			v->child->begin_y += resize;
1145 		if (v->child->begin_y < 3) {
1146 			view->count = 0;
1147 			v->child->begin_y = 3;
1148 		} else if (v->child->begin_y > LINES - 1) {
1149 			view->count = 0;
1150 			v->child->begin_y = LINES - 1;
1151 		}
1152 		v->ncols = COLS;
1153 		v->child->ncols = COLS;
1154 		view_adjust_offset(view, resize);
1155 		err = view_init_hsplit(v, v->child->begin_y);
1156 		if (err)
1157 			return err;
1158 		v->child->resized_y = v->child->begin_y;
1159 	} else {
1160 		if (v->child->resized_x)
1161 			v->child->begin_x = v->child->resized_x;
1162 		if (view->parent)
1163 			v->child->begin_x -= resize;
1164 		else
1165 			v->child->begin_x += resize;
1166 		if (v->child->begin_x < 11) {
1167 			view->count = 0;
1168 			v->child->begin_x = 11;
1169 		} else if (v->child->begin_x > COLS - 1) {
1170 			view->count = 0;
1171 			v->child->begin_x = COLS - 1;
1172 		}
1173 		v->child->resized_x = v->child->begin_x;
1174 	}
1175 
1176 	v->child->mode = v->mode;
1177 	v->child->nlines = v->lines - v->child->begin_y;
1178 	v->child->ncols = v->cols - v->child->begin_x;
1179 	v->focus_child = 1;
1180 
1181 	err = view_fullscreen(v);
1182 	if (err)
1183 		return err;
1184 	err = view_splitscreen(v->child);
1185 	if (err)
1186 		return err;
1187 
1188 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1189 		err = offset_selection_down(v->child);
1190 		if (err)
1191 			return err;
1192 	}
1193 
1194 	if (v->resize)
1195 		err = v->resize(v, 0);
1196 	else if (v->child->resize)
1197 		err = v->child->resize(v->child, 0);
1198 
1199 	v->resized = v->child->resized = 0;
1200 
1201 	return err;
1202 }
1203 
1204 static void
1205 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1206 {
1207 	struct tog_view *v = src->child ? src->child : src;
1208 
1209 	dst->resized_x = v->resized_x;
1210 	dst->resized_y = v->resized_y;
1211 }
1212 
1213 static const struct got_error *
1214 view_close_child(struct tog_view *view)
1215 {
1216 	const struct got_error *err = NULL;
1217 
1218 	if (view->child == NULL)
1219 		return NULL;
1220 
1221 	err = view_close(view->child);
1222 	view->child = NULL;
1223 	return err;
1224 }
1225 
1226 static const struct got_error *
1227 view_set_child(struct tog_view *view, struct tog_view *child)
1228 {
1229 	const struct got_error *err = NULL;
1230 
1231 	view->child = child;
1232 	child->parent = view;
1233 
1234 	err = view_resize(view);
1235 	if (err)
1236 		return err;
1237 
1238 	if (view->child->resized_x || view->child->resized_y)
1239 		err = view_resize_split(view, 0);
1240 
1241 	return err;
1242 }
1243 
1244 static const struct got_error *view_dispatch_request(struct tog_view **,
1245     struct tog_view *, enum tog_view_type, int, int);
1246 
1247 static const struct got_error *
1248 view_request_new(struct tog_view **requested, struct tog_view *view,
1249     enum tog_view_type request)
1250 {
1251 	struct tog_view		*new_view = NULL;
1252 	const struct got_error	*err;
1253 	int			 y = 0, x = 0;
1254 
1255 	*requested = NULL;
1256 
1257 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1258 		view_get_split(view, &y, &x);
1259 
1260 	err = view_dispatch_request(&new_view, view, request, y, x);
1261 	if (err)
1262 		return err;
1263 
1264 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1265 	    request != TOG_VIEW_HELP) {
1266 		err = view_init_hsplit(view, y);
1267 		if (err)
1268 			return err;
1269 	}
1270 
1271 	view->focussed = 0;
1272 	new_view->focussed = 1;
1273 	new_view->mode = view->mode;
1274 	new_view->nlines = request == TOG_VIEW_HELP ?
1275 	    view->lines : view->lines - y;
1276 
1277 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1278 		view_transfer_size(new_view, view);
1279 		err = view_close_child(view);
1280 		if (err)
1281 			return err;
1282 		err = view_set_child(view, new_view);
1283 		if (err)
1284 			return err;
1285 		view->focus_child = 1;
1286 	} else
1287 		*requested = new_view;
1288 
1289 	return NULL;
1290 }
1291 
1292 static void
1293 tog_resizeterm(void)
1294 {
1295 	int cols, lines;
1296 	struct winsize size;
1297 
1298 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1299 		cols = 80;     /* Default */
1300 		lines = 24;
1301 	} else {
1302 		cols = size.ws_col;
1303 		lines = size.ws_row;
1304 	}
1305 	resize_term(lines, cols);
1306 }
1307 
1308 static const struct got_error *
1309 view_search_start(struct tog_view *view, int fast_refresh)
1310 {
1311 	const struct got_error *err = NULL;
1312 	struct tog_view *v = view;
1313 	char pattern[1024];
1314 	int ret;
1315 
1316 	if (view->search_started) {
1317 		regfree(&view->regex);
1318 		view->searching = 0;
1319 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1320 	}
1321 	view->search_started = 0;
1322 
1323 	if (view->nlines < 1)
1324 		return NULL;
1325 
1326 	if (view_is_hsplit_top(view))
1327 		v = view->child;
1328 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1329 		v = view->parent;
1330 
1331 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1332 	wclrtoeol(v->window);
1333 
1334 	nodelay(v->window, FALSE);  /* block for search term input */
1335 	nocbreak();
1336 	echo();
1337 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1338 	wrefresh(v->window);
1339 	cbreak();
1340 	noecho();
1341 	nodelay(v->window, TRUE);
1342 	if (!fast_refresh && !using_mock_io)
1343 		halfdelay(10);
1344 	if (ret == ERR)
1345 		return NULL;
1346 
1347 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1348 		err = view->search_start(view);
1349 		if (err) {
1350 			regfree(&view->regex);
1351 			return err;
1352 		}
1353 		view->search_started = 1;
1354 		view->searching = TOG_SEARCH_FORWARD;
1355 		view->search_next_done = 0;
1356 		view->search_next(view);
1357 	}
1358 
1359 	return NULL;
1360 }
1361 
1362 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1363 static const struct got_error *
1364 switch_split(struct tog_view *view)
1365 {
1366 	const struct got_error	*err = NULL;
1367 	struct tog_view		*v = NULL;
1368 
1369 	if (view->parent)
1370 		v = view->parent;
1371 	else
1372 		v = view;
1373 
1374 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1375 		v->mode = TOG_VIEW_SPLIT_VERT;
1376 	else
1377 		v->mode = TOG_VIEW_SPLIT_HRZN;
1378 
1379 	if (!v->child)
1380 		return NULL;
1381 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1382 		v->mode = TOG_VIEW_SPLIT_NONE;
1383 
1384 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1385 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1386 		v->child->begin_y = v->child->resized_y;
1387 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1388 		v->child->begin_x = v->child->resized_x;
1389 
1390 
1391 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1392 		v->ncols = COLS;
1393 		v->child->ncols = COLS;
1394 		v->child->nscrolled = LINES - v->child->nlines;
1395 
1396 		err = view_init_hsplit(v, v->child->begin_y);
1397 		if (err)
1398 			return err;
1399 	}
1400 	v->child->mode = v->mode;
1401 	v->child->nlines = v->lines - v->child->begin_y;
1402 	v->focus_child = 1;
1403 
1404 	err = view_fullscreen(v);
1405 	if (err)
1406 		return err;
1407 	err = view_splitscreen(v->child);
1408 	if (err)
1409 		return err;
1410 
1411 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1412 		v->mode = TOG_VIEW_SPLIT_VERT;
1413 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1414 		err = offset_selection_down(v);
1415 		if (err)
1416 			return err;
1417 		err = offset_selection_down(v->child);
1418 		if (err)
1419 			return err;
1420 	} else {
1421 		offset_selection_up(v);
1422 		offset_selection_up(v->child);
1423 	}
1424 	if (v->resize)
1425 		err = v->resize(v, 0);
1426 	else if (v->child->resize)
1427 		err = v->child->resize(v->child, 0);
1428 
1429 	return err;
1430 }
1431 
1432 /*
1433  * Strip trailing whitespace from str starting at byte *n;
1434  * if *n < 0, use strlen(str). Return new str length in *n.
1435  */
1436 static void
1437 strip_trailing_ws(char *str, int *n)
1438 {
1439 	size_t x = *n;
1440 
1441 	if (str == NULL || *str == '\0')
1442 		return;
1443 
1444 	if (x < 0)
1445 		x = strlen(str);
1446 
1447 	while (x-- > 0 && isspace((unsigned char)str[x]))
1448 		str[x] = '\0';
1449 
1450 	*n = x + 1;
1451 }
1452 
1453 /*
1454  * Extract visible substring of line y from the curses screen
1455  * and strip trailing whitespace. If vline is set, overwrite
1456  * line[vline] with '|' because the ACS_VLINE character is
1457  * written out as 'x'. Write the line to file f.
1458  */
1459 static const struct got_error *
1460 view_write_line(FILE *f, int y, int vline)
1461 {
1462 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1463 	int	r, w;
1464 
1465 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1466 	if (r == ERR)
1467 		return got_error_fmt(GOT_ERR_RANGE,
1468 		    "failed to extract line %d", y);
1469 
1470 	/*
1471 	 * In some views, lines are padded with blanks to COLS width.
1472 	 * Strip them so we can diff without the -b flag when testing.
1473 	 */
1474 	strip_trailing_ws(line, &r);
1475 
1476 	if (vline > 0)
1477 		line[vline] = '|';
1478 
1479 	w = fprintf(f, "%s\n", line);
1480 	if (w != r + 1)		/* \n */
1481 		return got_ferror(f, GOT_ERR_IO);
1482 
1483 	return NULL;
1484 }
1485 
1486 /*
1487  * Capture the visible curses screen by writing each line to the
1488  * file at the path set via the TOG_SCR_DUMP environment variable.
1489  */
1490 static const struct got_error *
1491 screendump(struct tog_view *view)
1492 {
1493 	const struct got_error	*err;
1494 	int			 i;
1495 
1496 	err = got_opentemp_truncate(tog_io.sdump);
1497 	if (err)
1498 		return err;
1499 
1500 	if ((view->child && view->child->begin_x) ||
1501 	    (view->parent && view->begin_x)) {
1502 		int ncols = view->child ? view->ncols : view->parent->ncols;
1503 
1504 		/* vertical splitscreen */
1505 		for (i = 0; i < view->nlines; ++i) {
1506 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1507 			if (err)
1508 				goto done;
1509 		}
1510 	} else {
1511 		int hline = 0;
1512 
1513 		/* fullscreen or horizontal splitscreen */
1514 		if ((view->child && view->child->begin_y) ||
1515 		    (view->parent && view->begin_y))	/* hsplit */
1516 			hline = view->child ?
1517 			    view->child->begin_y : view->begin_y;
1518 
1519 		for (i = 0; i < view->lines; i++) {
1520 			if (hline && i == hline - 1) {
1521 				int c;
1522 
1523 				/* ACS_HLINE writes out as 'q', overwrite it */
1524 				for (c = 0; c < view->cols; ++c)
1525 					fputc('-', tog_io.sdump);
1526 				fputc('\n', tog_io.sdump);
1527 				continue;
1528 			}
1529 
1530 			err = view_write_line(tog_io.sdump, i, 0);
1531 			if (err)
1532 				goto done;
1533 		}
1534 	}
1535 
1536 done:
1537 	return err;
1538 }
1539 
1540 /*
1541  * Compute view->count from numeric input. Assign total to view->count and
1542  * return first non-numeric key entered.
1543  */
1544 static int
1545 get_compound_key(struct tog_view *view, int c)
1546 {
1547 	struct tog_view	*v = view;
1548 	int		 x, n = 0;
1549 
1550 	if (view_is_hsplit_top(view))
1551 		v = view->child;
1552 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1553 		v = view->parent;
1554 
1555 	view->count = 0;
1556 	cbreak();  /* block for input */
1557 	nodelay(view->window, FALSE);
1558 	wmove(v->window, v->nlines - 1, 0);
1559 	wclrtoeol(v->window);
1560 	waddch(v->window, ':');
1561 
1562 	do {
1563 		x = getcurx(v->window);
1564 		if (x != ERR && x < view->ncols) {
1565 			waddch(v->window, c);
1566 			wrefresh(v->window);
1567 		}
1568 
1569 		/*
1570 		 * Don't overflow. Max valid request should be the greatest
1571 		 * between the longest and total lines; cap at 10 million.
1572 		 */
1573 		if (n >= 9999999)
1574 			n = 9999999;
1575 		else
1576 			n = n * 10 + (c - '0');
1577 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1578 
1579 	if (c == 'G' || c == 'g') {	/* nG key map */
1580 		view->gline = view->hiline = n;
1581 		n = 0;
1582 		c = 0;
1583 	}
1584 
1585 	/* Massage excessive or inapplicable values at the input handler. */
1586 	view->count = n;
1587 
1588 	return c;
1589 }
1590 
1591 static void
1592 action_report(struct tog_view *view)
1593 {
1594 	struct tog_view *v = view;
1595 
1596 	if (view_is_hsplit_top(view))
1597 		v = view->child;
1598 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1599 		v = view->parent;
1600 
1601 	wmove(v->window, v->nlines - 1, 0);
1602 	wclrtoeol(v->window);
1603 	wprintw(v->window, ":%s", view->action);
1604 	wrefresh(v->window);
1605 
1606 	/*
1607 	 * Clear action status report. Only clear in blame view
1608 	 * once annotating is complete, otherwise it's too fast.
1609 	 */
1610 	if (view->type == TOG_VIEW_BLAME) {
1611 		if (view->state.blame.blame_complete)
1612 			view->action = NULL;
1613 	} else
1614 		view->action = NULL;
1615 }
1616 
1617 /*
1618  * Read the next line from the test script and assign
1619  * key instruction to *ch. If at EOF, set the *done flag.
1620  */
1621 static const struct got_error *
1622 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1623 {
1624 	const struct got_error	*err = NULL;
1625 	char			*line = NULL;
1626 	size_t			 linesz = 0;
1627 
1628 	if (view->count && --view->count) {
1629 		*ch = view->ch;
1630 		return NULL;
1631 	} else
1632 		*ch = -1;
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 	}
1643 
1644 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1645 		tog_io.wait_for_ui = 1;
1646 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1647 		*ch = KEY_ENTER;
1648 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1649 		*ch = KEY_RIGHT;
1650 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1651 		*ch = KEY_LEFT;
1652 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1653 		*ch = KEY_DOWN;
1654 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1655 		*ch = KEY_UP;
1656 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1657 		*ch = TOG_KEY_SCRDUMP;
1658 	else if (isdigit((unsigned char)*line)) {
1659 		char *t = line;
1660 
1661 		while (isdigit((unsigned char)*t))
1662 			++t;
1663 		view->ch = *ch = *t;
1664 		*t = '\0';
1665 		/* ignore error, view->count is 0 if instruction is invalid */
1666 		view->count = strtonum(line, 0, INT_MAX, NULL);
1667 	} else
1668 		*ch = *line;
1669 
1670 done:
1671 	free(line);
1672 	return err;
1673 }
1674 
1675 static const struct got_error *
1676 view_input(struct tog_view **new, int *done, struct tog_view *view,
1677     struct tog_view_list_head *views, int fast_refresh)
1678 {
1679 	const struct got_error *err = NULL;
1680 	struct tog_view *v;
1681 	int ch, errcode;
1682 
1683 	*new = NULL;
1684 
1685 	if (view->action)
1686 		action_report(view);
1687 
1688 	/* Clear "no matches" indicator. */
1689 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1690 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1691 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1692 		view->count = 0;
1693 	}
1694 
1695 	if (view->searching && !view->search_next_done) {
1696 		errcode = pthread_mutex_unlock(&tog_mutex);
1697 		if (errcode)
1698 			return got_error_set_errno(errcode,
1699 			    "pthread_mutex_unlock");
1700 		sched_yield();
1701 		errcode = pthread_mutex_lock(&tog_mutex);
1702 		if (errcode)
1703 			return got_error_set_errno(errcode,
1704 			    "pthread_mutex_lock");
1705 		view->search_next(view);
1706 		return NULL;
1707 	}
1708 
1709 	/* Allow threads to make progress while we are waiting for input. */
1710 	errcode = pthread_mutex_unlock(&tog_mutex);
1711 	if (errcode)
1712 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1713 
1714 	if (using_mock_io) {
1715 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1716 		if (err) {
1717 			errcode = pthread_mutex_lock(&tog_mutex);
1718 			return err;
1719 		}
1720 	} else if (view->count && --view->count) {
1721 		cbreak();
1722 		nodelay(view->window, TRUE);
1723 		ch = wgetch(view->window);
1724 		/* let C-g or backspace abort unfinished count */
1725 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1726 			view->count = 0;
1727 		else
1728 			ch = view->ch;
1729 	} else {
1730 		ch = wgetch(view->window);
1731 		if (ch >= '1' && ch  <= '9')
1732 			view->ch = ch = get_compound_key(view, ch);
1733 	}
1734 	if (view->hiline && ch != ERR && ch != 0)
1735 		view->hiline = 0;  /* key pressed, clear line highlight */
1736 	nodelay(view->window, TRUE);
1737 	errcode = pthread_mutex_lock(&tog_mutex);
1738 	if (errcode)
1739 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1740 
1741 	if (tog_sigwinch_received || tog_sigcont_received) {
1742 		tog_resizeterm();
1743 		tog_sigwinch_received = 0;
1744 		tog_sigcont_received = 0;
1745 		TAILQ_FOREACH(v, views, entry) {
1746 			err = view_resize(v);
1747 			if (err)
1748 				return err;
1749 			err = v->input(new, v, KEY_RESIZE);
1750 			if (err)
1751 				return err;
1752 			if (v->child) {
1753 				err = view_resize(v->child);
1754 				if (err)
1755 					return err;
1756 				err = v->child->input(new, v->child,
1757 				    KEY_RESIZE);
1758 				if (err)
1759 					return err;
1760 				if (v->child->resized_x || v->child->resized_y) {
1761 					err = view_resize_split(v, 0);
1762 					if (err)
1763 						return err;
1764 				}
1765 			}
1766 		}
1767 	}
1768 
1769 	switch (ch) {
1770 	case '?':
1771 	case 'H':
1772 	case KEY_F(1):
1773 		if (view->type == TOG_VIEW_HELP)
1774 			err = view->reset(view);
1775 		else
1776 			err = view_request_new(new, view, TOG_VIEW_HELP);
1777 		break;
1778 	case '\t':
1779 		view->count = 0;
1780 		if (view->child) {
1781 			view->focussed = 0;
1782 			view->child->focussed = 1;
1783 			view->focus_child = 1;
1784 		} else if (view->parent) {
1785 			view->focussed = 0;
1786 			view->parent->focussed = 1;
1787 			view->parent->focus_child = 0;
1788 			if (!view_is_splitscreen(view)) {
1789 				if (view->parent->resize) {
1790 					err = view->parent->resize(view->parent,
1791 					    0);
1792 					if (err)
1793 						return err;
1794 				}
1795 				offset_selection_up(view->parent);
1796 				err = view_fullscreen(view->parent);
1797 				if (err)
1798 					return err;
1799 			}
1800 		}
1801 		break;
1802 	case 'q':
1803 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1804 			if (view->parent->resize) {
1805 				/* might need more commits to fill fullscreen */
1806 				err = view->parent->resize(view->parent, 0);
1807 				if (err)
1808 					break;
1809 			}
1810 			offset_selection_up(view->parent);
1811 		}
1812 		err = view->input(new, view, ch);
1813 		view->dying = 1;
1814 		break;
1815 	case 'Q':
1816 		*done = 1;
1817 		break;
1818 	case 'F':
1819 		view->count = 0;
1820 		if (view_is_parent_view(view)) {
1821 			if (view->child == NULL)
1822 				break;
1823 			if (view_is_splitscreen(view->child)) {
1824 				view->focussed = 0;
1825 				view->child->focussed = 1;
1826 				err = view_fullscreen(view->child);
1827 			} else {
1828 				err = view_splitscreen(view->child);
1829 				if (!err)
1830 					err = view_resize_split(view, 0);
1831 			}
1832 			if (err)
1833 				break;
1834 			err = view->child->input(new, view->child,
1835 			    KEY_RESIZE);
1836 		} else {
1837 			if (view_is_splitscreen(view)) {
1838 				view->parent->focussed = 0;
1839 				view->focussed = 1;
1840 				err = view_fullscreen(view);
1841 			} else {
1842 				err = view_splitscreen(view);
1843 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1844 					err = view_resize(view->parent);
1845 				if (!err)
1846 					err = view_resize_split(view, 0);
1847 			}
1848 			if (err)
1849 				break;
1850 			err = view->input(new, view, KEY_RESIZE);
1851 		}
1852 		if (err)
1853 			break;
1854 		if (view->resize) {
1855 			err = view->resize(view, 0);
1856 			if (err)
1857 				break;
1858 		}
1859 		if (view->parent)
1860 			err = offset_selection_down(view->parent);
1861 		if (!err)
1862 			err = offset_selection_down(view);
1863 		break;
1864 	case 'S':
1865 		view->count = 0;
1866 		err = switch_split(view);
1867 		break;
1868 	case '-':
1869 		err = view_resize_split(view, -1);
1870 		break;
1871 	case '+':
1872 		err = view_resize_split(view, 1);
1873 		break;
1874 	case KEY_RESIZE:
1875 		break;
1876 	case '/':
1877 		view->count = 0;
1878 		if (view->search_start)
1879 			view_search_start(view, fast_refresh);
1880 		else
1881 			err = view->input(new, view, ch);
1882 		break;
1883 	case 'N':
1884 	case 'n':
1885 		if (view->search_started && view->search_next) {
1886 			view->searching = (ch == 'n' ?
1887 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1888 			view->search_next_done = 0;
1889 			view->search_next(view);
1890 		} else
1891 			err = view->input(new, view, ch);
1892 		break;
1893 	case 'A':
1894 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1895 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1896 			view->action = "Patience diff algorithm";
1897 		} else {
1898 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1899 			view->action = "Myers diff algorithm";
1900 		}
1901 		TAILQ_FOREACH(v, views, entry) {
1902 			if (v->reset) {
1903 				err = v->reset(v);
1904 				if (err)
1905 					return err;
1906 			}
1907 			if (v->child && v->child->reset) {
1908 				err = v->child->reset(v->child);
1909 				if (err)
1910 					return err;
1911 			}
1912 		}
1913 		break;
1914 	case TOG_KEY_SCRDUMP:
1915 		err = screendump(view);
1916 		break;
1917 	default:
1918 		err = view->input(new, view, ch);
1919 		break;
1920 	}
1921 
1922 	return err;
1923 }
1924 
1925 static int
1926 view_needs_focus_indication(struct tog_view *view)
1927 {
1928 	if (view_is_parent_view(view)) {
1929 		if (view->child == NULL || view->child->focussed)
1930 			return 0;
1931 		if (!view_is_splitscreen(view->child))
1932 			return 0;
1933 	} else if (!view_is_splitscreen(view))
1934 		return 0;
1935 
1936 	return view->focussed;
1937 }
1938 
1939 static const struct got_error *
1940 tog_io_close(void)
1941 {
1942 	const struct got_error *err = NULL;
1943 
1944 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1945 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1946 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1947 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1948 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1949 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1950 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1951 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1952 
1953 	return err;
1954 }
1955 
1956 static const struct got_error *
1957 view_loop(struct tog_view *view)
1958 {
1959 	const struct got_error *err = NULL;
1960 	struct tog_view_list_head views;
1961 	struct tog_view *new_view;
1962 	char *mode;
1963 	int fast_refresh = 10;
1964 	int done = 0, errcode;
1965 
1966 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1967 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1968 		view->mode = TOG_VIEW_SPLIT_VERT;
1969 	else
1970 		view->mode = TOG_VIEW_SPLIT_HRZN;
1971 
1972 	errcode = pthread_mutex_lock(&tog_mutex);
1973 	if (errcode)
1974 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1975 
1976 	TAILQ_INIT(&views);
1977 	TAILQ_INSERT_HEAD(&views, view, entry);
1978 
1979 	view->focussed = 1;
1980 	err = view->show(view);
1981 	if (err)
1982 		return err;
1983 	update_panels();
1984 	doupdate();
1985 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1986 	    !tog_fatal_signal_received()) {
1987 		/* Refresh fast during initialization, then become slower. */
1988 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1989 			halfdelay(10); /* switch to once per second */
1990 
1991 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1992 		if (err)
1993 			break;
1994 
1995 		if (view->dying && view == TAILQ_FIRST(&views) &&
1996 		    TAILQ_NEXT(view, entry) == NULL)
1997 			done = 1;
1998 		if (done) {
1999 			struct tog_view *v;
2000 
2001 			/*
2002 			 * When we quit, scroll the screen up a single line
2003 			 * so we don't lose any information.
2004 			 */
2005 			TAILQ_FOREACH(v, &views, entry) {
2006 				wmove(v->window, 0, 0);
2007 				wdeleteln(v->window);
2008 				wnoutrefresh(v->window);
2009 				if (v->child && !view_is_fullscreen(v)) {
2010 					wmove(v->child->window, 0, 0);
2011 					wdeleteln(v->child->window);
2012 					wnoutrefresh(v->child->window);
2013 				}
2014 			}
2015 			doupdate();
2016 		}
2017 
2018 		if (view->dying) {
2019 			struct tog_view *v, *prev = NULL;
2020 
2021 			if (view_is_parent_view(view))
2022 				prev = TAILQ_PREV(view, tog_view_list_head,
2023 				    entry);
2024 			else if (view->parent)
2025 				prev = view->parent;
2026 
2027 			if (view->parent) {
2028 				view->parent->child = NULL;
2029 				view->parent->focus_child = 0;
2030 				/* Restore fullscreen line height. */
2031 				view->parent->nlines = view->parent->lines;
2032 				err = view_resize(view->parent);
2033 				if (err)
2034 					break;
2035 				/* Make resized splits persist. */
2036 				view_transfer_size(view->parent, view);
2037 			} else
2038 				TAILQ_REMOVE(&views, view, entry);
2039 
2040 			err = view_close(view);
2041 			if (err)
2042 				goto done;
2043 
2044 			view = NULL;
2045 			TAILQ_FOREACH(v, &views, entry) {
2046 				if (v->focussed)
2047 					break;
2048 			}
2049 			if (view == NULL && new_view == NULL) {
2050 				/* No view has focus. Try to pick one. */
2051 				if (prev)
2052 					view = prev;
2053 				else if (!TAILQ_EMPTY(&views)) {
2054 					view = TAILQ_LAST(&views,
2055 					    tog_view_list_head);
2056 				}
2057 				if (view) {
2058 					if (view->focus_child) {
2059 						view->child->focussed = 1;
2060 						view = view->child;
2061 					} else
2062 						view->focussed = 1;
2063 				}
2064 			}
2065 		}
2066 		if (new_view) {
2067 			struct tog_view *v, *t;
2068 			/* Only allow one parent view per type. */
2069 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2070 				if (v->type != new_view->type)
2071 					continue;
2072 				TAILQ_REMOVE(&views, v, entry);
2073 				err = view_close(v);
2074 				if (err)
2075 					goto done;
2076 				break;
2077 			}
2078 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2079 			view = new_view;
2080 		}
2081 		if (view && !done) {
2082 			if (view_is_parent_view(view)) {
2083 				if (view->child && view->child->focussed)
2084 					view = view->child;
2085 			} else {
2086 				if (view->parent && view->parent->focussed)
2087 					view = view->parent;
2088 			}
2089 			show_panel(view->panel);
2090 			if (view->child && view_is_splitscreen(view->child))
2091 				show_panel(view->child->panel);
2092 			if (view->parent && view_is_splitscreen(view)) {
2093 				err = view->parent->show(view->parent);
2094 				if (err)
2095 					goto done;
2096 			}
2097 			err = view->show(view);
2098 			if (err)
2099 				goto done;
2100 			if (view->child) {
2101 				err = view->child->show(view->child);
2102 				if (err)
2103 					goto done;
2104 			}
2105 			update_panels();
2106 			doupdate();
2107 		}
2108 	}
2109 done:
2110 	while (!TAILQ_EMPTY(&views)) {
2111 		const struct got_error *close_err;
2112 		view = TAILQ_FIRST(&views);
2113 		TAILQ_REMOVE(&views, view, entry);
2114 		close_err = view_close(view);
2115 		if (close_err && err == NULL)
2116 			err = close_err;
2117 	}
2118 
2119 	errcode = pthread_mutex_unlock(&tog_mutex);
2120 	if (errcode && err == NULL)
2121 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2122 
2123 	return err;
2124 }
2125 
2126 __dead static void
2127 usage_log(void)
2128 {
2129 	endwin();
2130 	fprintf(stderr,
2131 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2132 	    getprogname());
2133 	exit(1);
2134 }
2135 
2136 /* Create newly allocated wide-character string equivalent to a byte string. */
2137 static const struct got_error *
2138 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2139 {
2140 	char *vis = NULL;
2141 	const struct got_error *err = NULL;
2142 
2143 	*ws = NULL;
2144 	*wlen = mbstowcs(NULL, s, 0);
2145 	if (*wlen == (size_t)-1) {
2146 		int vislen;
2147 		if (errno != EILSEQ)
2148 			return got_error_from_errno("mbstowcs");
2149 
2150 		/* byte string invalid in current encoding; try to "fix" it */
2151 		err = got_mbsavis(&vis, &vislen, s);
2152 		if (err)
2153 			return err;
2154 		*wlen = mbstowcs(NULL, vis, 0);
2155 		if (*wlen == (size_t)-1) {
2156 			err = got_error_from_errno("mbstowcs"); /* give up */
2157 			goto done;
2158 		}
2159 	}
2160 
2161 	*ws = calloc(*wlen + 1, sizeof(**ws));
2162 	if (*ws == NULL) {
2163 		err = got_error_from_errno("calloc");
2164 		goto done;
2165 	}
2166 
2167 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2168 		err = got_error_from_errno("mbstowcs");
2169 done:
2170 	free(vis);
2171 	if (err) {
2172 		free(*ws);
2173 		*ws = NULL;
2174 		*wlen = 0;
2175 	}
2176 	return err;
2177 }
2178 
2179 static const struct got_error *
2180 expand_tab(char **ptr, const char *src)
2181 {
2182 	char	*dst;
2183 	size_t	 len, n, idx = 0, sz = 0;
2184 
2185 	*ptr = NULL;
2186 	n = len = strlen(src);
2187 	dst = malloc(n + 1);
2188 	if (dst == NULL)
2189 		return got_error_from_errno("malloc");
2190 
2191 	while (idx < len && src[idx]) {
2192 		const char c = src[idx];
2193 
2194 		if (c == '\t') {
2195 			size_t nb = TABSIZE - sz % TABSIZE;
2196 			char *p;
2197 
2198 			p = realloc(dst, n + nb);
2199 			if (p == NULL) {
2200 				free(dst);
2201 				return got_error_from_errno("realloc");
2202 
2203 			}
2204 			dst = p;
2205 			n += nb;
2206 			memset(dst + sz, ' ', nb);
2207 			sz += nb;
2208 		} else
2209 			dst[sz++] = src[idx];
2210 		++idx;
2211 	}
2212 
2213 	dst[sz] = '\0';
2214 	*ptr = dst;
2215 	return NULL;
2216 }
2217 
2218 /*
2219  * Advance at most n columns from wline starting at offset off.
2220  * Return the index to the first character after the span operation.
2221  * Return the combined column width of all spanned wide character in
2222  * *rcol.
2223  */
2224 static int
2225 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2226 {
2227 	int width, i, cols = 0;
2228 
2229 	if (n == 0) {
2230 		*rcol = cols;
2231 		return off;
2232 	}
2233 
2234 	for (i = off; wline[i] != L'\0'; ++i) {
2235 		if (wline[i] == L'\t')
2236 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2237 		else
2238 			width = wcwidth(wline[i]);
2239 
2240 		if (width == -1) {
2241 			width = 1;
2242 			wline[i] = L'.';
2243 		}
2244 
2245 		if (cols + width > n)
2246 			break;
2247 		cols += width;
2248 	}
2249 
2250 	*rcol = cols;
2251 	return i;
2252 }
2253 
2254 /*
2255  * Format a line for display, ensuring that it won't overflow a width limit.
2256  * With scrolling, the width returned refers to the scrolled version of the
2257  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2258  */
2259 static const struct got_error *
2260 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2261     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2262 {
2263 	const struct got_error *err = NULL;
2264 	int cols;
2265 	wchar_t *wline = NULL;
2266 	char *exstr = NULL;
2267 	size_t wlen;
2268 	int i, scrollx;
2269 
2270 	*wlinep = NULL;
2271 	*widthp = 0;
2272 
2273 	if (expand) {
2274 		err = expand_tab(&exstr, line);
2275 		if (err)
2276 			return err;
2277 	}
2278 
2279 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2280 	free(exstr);
2281 	if (err)
2282 		return err;
2283 
2284 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2285 
2286 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2287 		wline[wlen - 1] = L'\0';
2288 		wlen--;
2289 	}
2290 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2291 		wline[wlen - 1] = L'\0';
2292 		wlen--;
2293 	}
2294 
2295 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2296 	wline[i] = L'\0';
2297 
2298 	if (widthp)
2299 		*widthp = cols;
2300 	if (scrollxp)
2301 		*scrollxp = scrollx;
2302 	if (err)
2303 		free(wline);
2304 	else
2305 		*wlinep = wline;
2306 	return err;
2307 }
2308 
2309 static const struct got_error*
2310 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2311     struct got_object_id *id, struct got_repository *repo)
2312 {
2313 	static const struct got_error *err = NULL;
2314 	struct got_reflist_entry *re;
2315 	char *s;
2316 	const char *name;
2317 
2318 	*refs_str = NULL;
2319 
2320 	TAILQ_FOREACH(re, refs, entry) {
2321 		struct got_tag_object *tag = NULL;
2322 		struct got_object_id *ref_id;
2323 		int cmp;
2324 
2325 		name = got_ref_get_name(re->ref);
2326 		if (strcmp(name, GOT_REF_HEAD) == 0)
2327 			continue;
2328 		if (strncmp(name, "refs/", 5) == 0)
2329 			name += 5;
2330 		if (strncmp(name, "got/", 4) == 0 &&
2331 		    strncmp(name, "got/backup/", 11) != 0)
2332 			continue;
2333 		if (strncmp(name, "heads/", 6) == 0)
2334 			name += 6;
2335 		if (strncmp(name, "remotes/", 8) == 0) {
2336 			name += 8;
2337 			s = strstr(name, "/" GOT_REF_HEAD);
2338 			if (s != NULL && s[strlen(s)] == '\0')
2339 				continue;
2340 		}
2341 		err = got_ref_resolve(&ref_id, repo, re->ref);
2342 		if (err)
2343 			break;
2344 		if (strncmp(name, "tags/", 5) == 0) {
2345 			err = got_object_open_as_tag(&tag, repo, ref_id);
2346 			if (err) {
2347 				if (err->code != GOT_ERR_OBJ_TYPE) {
2348 					free(ref_id);
2349 					break;
2350 				}
2351 				/* Ref points at something other than a tag. */
2352 				err = NULL;
2353 				tag = NULL;
2354 			}
2355 		}
2356 		cmp = got_object_id_cmp(tag ?
2357 		    got_object_tag_get_object_id(tag) : ref_id, id);
2358 		free(ref_id);
2359 		if (tag)
2360 			got_object_tag_close(tag);
2361 		if (cmp != 0)
2362 			continue;
2363 		s = *refs_str;
2364 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2365 		    s ? ", " : "", name) == -1) {
2366 			err = got_error_from_errno("asprintf");
2367 			free(s);
2368 			*refs_str = NULL;
2369 			break;
2370 		}
2371 		free(s);
2372 	}
2373 
2374 	return err;
2375 }
2376 
2377 static const struct got_error *
2378 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2379     int col_tab_align)
2380 {
2381 	char *smallerthan;
2382 
2383 	smallerthan = strchr(author, '<');
2384 	if (smallerthan && smallerthan[1] != '\0')
2385 		author = smallerthan + 1;
2386 	author[strcspn(author, "@>")] = '\0';
2387 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2388 	    col_tab_align, 0);
2389 }
2390 
2391 static const struct got_error *
2392 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2393     struct got_object_id *id, const size_t date_display_cols,
2394     int author_display_cols)
2395 {
2396 	struct tog_log_view_state *s = &view->state.log;
2397 	const struct got_error *err = NULL;
2398 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2399 	char *logmsg0 = NULL, *logmsg = NULL;
2400 	char *author = NULL;
2401 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2402 	int author_width, logmsg_width;
2403 	char *newline, *line = NULL;
2404 	int col, limit, scrollx;
2405 	const int avail = view->ncols;
2406 	struct tm tm;
2407 	time_t committer_time;
2408 	struct tog_color *tc;
2409 
2410 	committer_time = got_object_commit_get_committer_time(commit);
2411 	if (gmtime_r(&committer_time, &tm) == NULL)
2412 		return got_error_from_errno("gmtime_r");
2413 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2414 		return got_error(GOT_ERR_NO_SPACE);
2415 
2416 	if (avail <= date_display_cols)
2417 		limit = MIN(sizeof(datebuf) - 1, avail);
2418 	else
2419 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2420 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2421 	if (tc)
2422 		wattr_on(view->window,
2423 		    COLOR_PAIR(tc->colorpair), NULL);
2424 	waddnstr(view->window, datebuf, limit);
2425 	if (tc)
2426 		wattr_off(view->window,
2427 		    COLOR_PAIR(tc->colorpair), NULL);
2428 	col = limit;
2429 	if (col > avail)
2430 		goto done;
2431 
2432 	if (avail >= 120) {
2433 		char *id_str;
2434 		err = got_object_id_str(&id_str, id);
2435 		if (err)
2436 			goto done;
2437 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2438 		if (tc)
2439 			wattr_on(view->window,
2440 			    COLOR_PAIR(tc->colorpair), NULL);
2441 		wprintw(view->window, "%.8s ", id_str);
2442 		if (tc)
2443 			wattr_off(view->window,
2444 			    COLOR_PAIR(tc->colorpair), NULL);
2445 		free(id_str);
2446 		col += 9;
2447 		if (col > avail)
2448 			goto done;
2449 	}
2450 
2451 	if (s->use_committer)
2452 		author = strdup(got_object_commit_get_committer(commit));
2453 	else
2454 		author = strdup(got_object_commit_get_author(commit));
2455 	if (author == NULL) {
2456 		err = got_error_from_errno("strdup");
2457 		goto done;
2458 	}
2459 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2460 	if (err)
2461 		goto done;
2462 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2463 	if (tc)
2464 		wattr_on(view->window,
2465 		    COLOR_PAIR(tc->colorpair), NULL);
2466 	waddwstr(view->window, wauthor);
2467 	col += author_width;
2468 	while (col < avail && author_width < author_display_cols + 2) {
2469 		waddch(view->window, ' ');
2470 		col++;
2471 		author_width++;
2472 	}
2473 	if (tc)
2474 		wattr_off(view->window,
2475 		    COLOR_PAIR(tc->colorpair), NULL);
2476 	if (col > avail)
2477 		goto done;
2478 
2479 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2480 	if (err)
2481 		goto done;
2482 	logmsg = logmsg0;
2483 	while (*logmsg == '\n')
2484 		logmsg++;
2485 	newline = strchr(logmsg, '\n');
2486 	if (newline)
2487 		*newline = '\0';
2488 	limit = avail - col;
2489 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2490 		limit--;	/* for the border */
2491 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2492 	    limit, col, 1);
2493 	if (err)
2494 		goto done;
2495 	waddwstr(view->window, &wlogmsg[scrollx]);
2496 	col += MAX(logmsg_width, 0);
2497 	while (col < avail) {
2498 		waddch(view->window, ' ');
2499 		col++;
2500 	}
2501 done:
2502 	free(logmsg0);
2503 	free(wlogmsg);
2504 	free(author);
2505 	free(wauthor);
2506 	free(line);
2507 	return err;
2508 }
2509 
2510 static struct commit_queue_entry *
2511 alloc_commit_queue_entry(struct got_commit_object *commit,
2512     struct got_object_id *id)
2513 {
2514 	struct commit_queue_entry *entry;
2515 	struct got_object_id *dup;
2516 
2517 	entry = calloc(1, sizeof(*entry));
2518 	if (entry == NULL)
2519 		return NULL;
2520 
2521 	dup = got_object_id_dup(id);
2522 	if (dup == NULL) {
2523 		free(entry);
2524 		return NULL;
2525 	}
2526 
2527 	entry->id = dup;
2528 	entry->commit = commit;
2529 	return entry;
2530 }
2531 
2532 static void
2533 pop_commit(struct commit_queue *commits)
2534 {
2535 	struct commit_queue_entry *entry;
2536 
2537 	entry = TAILQ_FIRST(&commits->head);
2538 	TAILQ_REMOVE(&commits->head, entry, entry);
2539 	got_object_commit_close(entry->commit);
2540 	commits->ncommits--;
2541 	free(entry->id);
2542 	free(entry);
2543 }
2544 
2545 static void
2546 free_commits(struct commit_queue *commits)
2547 {
2548 	while (!TAILQ_EMPTY(&commits->head))
2549 		pop_commit(commits);
2550 }
2551 
2552 static const struct got_error *
2553 match_commit(int *have_match, struct got_object_id *id,
2554     struct got_commit_object *commit, regex_t *regex)
2555 {
2556 	const struct got_error *err = NULL;
2557 	regmatch_t regmatch;
2558 	char *id_str = NULL, *logmsg = NULL;
2559 
2560 	*have_match = 0;
2561 
2562 	err = got_object_id_str(&id_str, id);
2563 	if (err)
2564 		return err;
2565 
2566 	err = got_object_commit_get_logmsg(&logmsg, commit);
2567 	if (err)
2568 		goto done;
2569 
2570 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2571 	    &regmatch, 0) == 0 ||
2572 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2573 	    &regmatch, 0) == 0 ||
2574 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2575 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2576 		*have_match = 1;
2577 done:
2578 	free(id_str);
2579 	free(logmsg);
2580 	return err;
2581 }
2582 
2583 static const struct got_error *
2584 queue_commits(struct tog_log_thread_args *a)
2585 {
2586 	const struct got_error *err = NULL;
2587 
2588 	/*
2589 	 * We keep all commits open throughout the lifetime of the log
2590 	 * view in order to avoid having to re-fetch commits from disk
2591 	 * while updating the display.
2592 	 */
2593 	do {
2594 		struct got_object_id id;
2595 		struct got_commit_object *commit;
2596 		struct commit_queue_entry *entry;
2597 		int limit_match = 0;
2598 		int errcode;
2599 
2600 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2601 		    NULL, NULL);
2602 		if (err)
2603 			break;
2604 
2605 		err = got_object_open_as_commit(&commit, a->repo, &id);
2606 		if (err)
2607 			break;
2608 		entry = alloc_commit_queue_entry(commit, &id);
2609 		if (entry == NULL) {
2610 			err = got_error_from_errno("alloc_commit_queue_entry");
2611 			break;
2612 		}
2613 
2614 		errcode = pthread_mutex_lock(&tog_mutex);
2615 		if (errcode) {
2616 			err = got_error_set_errno(errcode,
2617 			    "pthread_mutex_lock");
2618 			break;
2619 		}
2620 
2621 		entry->idx = a->real_commits->ncommits;
2622 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2623 		a->real_commits->ncommits++;
2624 
2625 		if (*a->limiting) {
2626 			err = match_commit(&limit_match, &id, commit,
2627 			    a->limit_regex);
2628 			if (err)
2629 				break;
2630 
2631 			if (limit_match) {
2632 				struct commit_queue_entry *matched;
2633 
2634 				matched = alloc_commit_queue_entry(
2635 				    entry->commit, entry->id);
2636 				if (matched == NULL) {
2637 					err = got_error_from_errno(
2638 					    "alloc_commit_queue_entry");
2639 					break;
2640 				}
2641 				matched->commit = entry->commit;
2642 				got_object_commit_retain(entry->commit);
2643 
2644 				matched->idx = a->limit_commits->ncommits;
2645 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2646 				    matched, entry);
2647 				a->limit_commits->ncommits++;
2648 			}
2649 
2650 			/*
2651 			 * This is how we signal log_thread() that we
2652 			 * have found a match, and that it should be
2653 			 * counted as a new entry for the view.
2654 			 */
2655 			a->limit_match = limit_match;
2656 		}
2657 
2658 		if (*a->searching == TOG_SEARCH_FORWARD &&
2659 		    !*a->search_next_done) {
2660 			int have_match;
2661 			err = match_commit(&have_match, &id, commit, a->regex);
2662 			if (err)
2663 				break;
2664 
2665 			if (*a->limiting) {
2666 				if (limit_match && have_match)
2667 					*a->search_next_done =
2668 					    TOG_SEARCH_HAVE_MORE;
2669 			} else if (have_match)
2670 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2671 		}
2672 
2673 		errcode = pthread_mutex_unlock(&tog_mutex);
2674 		if (errcode && err == NULL)
2675 			err = got_error_set_errno(errcode,
2676 			    "pthread_mutex_unlock");
2677 		if (err)
2678 			break;
2679 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2680 
2681 	return err;
2682 }
2683 
2684 static void
2685 select_commit(struct tog_log_view_state *s)
2686 {
2687 	struct commit_queue_entry *entry;
2688 	int ncommits = 0;
2689 
2690 	entry = s->first_displayed_entry;
2691 	while (entry) {
2692 		if (ncommits == s->selected) {
2693 			s->selected_entry = entry;
2694 			break;
2695 		}
2696 		entry = TAILQ_NEXT(entry, entry);
2697 		ncommits++;
2698 	}
2699 }
2700 
2701 static const struct got_error *
2702 draw_commits(struct tog_view *view)
2703 {
2704 	const struct got_error *err = NULL;
2705 	struct tog_log_view_state *s = &view->state.log;
2706 	struct commit_queue_entry *entry = s->selected_entry;
2707 	int limit = view->nlines;
2708 	int width;
2709 	int ncommits, author_cols = 4;
2710 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2711 	char *refs_str = NULL;
2712 	wchar_t *wline;
2713 	struct tog_color *tc;
2714 	static const size_t date_display_cols = 12;
2715 
2716 	if (view_is_hsplit_top(view))
2717 		--limit;  /* account for border */
2718 
2719 	if (s->selected_entry &&
2720 	    !(view->searching && view->search_next_done == 0)) {
2721 		struct got_reflist_head *refs;
2722 		err = got_object_id_str(&id_str, s->selected_entry->id);
2723 		if (err)
2724 			return err;
2725 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2726 		    s->selected_entry->id);
2727 		if (refs) {
2728 			err = build_refs_str(&refs_str, refs,
2729 			    s->selected_entry->id, s->repo);
2730 			if (err)
2731 				goto done;
2732 		}
2733 	}
2734 
2735 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2736 		halfdelay(10); /* disable fast refresh */
2737 
2738 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2739 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2740 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2741 		    (view->searching && !view->search_next_done) ?
2742 		    "searching..." : "loading...") == -1) {
2743 			err = got_error_from_errno("asprintf");
2744 			goto done;
2745 		}
2746 	} else {
2747 		const char *search_str = NULL;
2748 		const char *limit_str = NULL;
2749 
2750 		if (view->searching) {
2751 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2752 				search_str = "no more matches";
2753 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2754 				search_str = "no matches found";
2755 			else if (!view->search_next_done)
2756 				search_str = "searching...";
2757 		}
2758 
2759 		if (s->limit_view && s->commits->ncommits == 0)
2760 			limit_str = "no matches found";
2761 
2762 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2763 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2764 		    search_str ? search_str : (refs_str ? refs_str : ""),
2765 		    limit_str ? limit_str : "") == -1) {
2766 			err = got_error_from_errno("asprintf");
2767 			goto done;
2768 		}
2769 	}
2770 
2771 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2772 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2773 		    "........................................",
2774 		    s->in_repo_path, ncommits_str) == -1) {
2775 			err = got_error_from_errno("asprintf");
2776 			header = NULL;
2777 			goto done;
2778 		}
2779 	} else if (asprintf(&header, "commit %s%s",
2780 	    id_str ? id_str : "........................................",
2781 	    ncommits_str) == -1) {
2782 		err = got_error_from_errno("asprintf");
2783 		header = NULL;
2784 		goto done;
2785 	}
2786 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2787 	if (err)
2788 		goto done;
2789 
2790 	werase(view->window);
2791 
2792 	if (view_needs_focus_indication(view))
2793 		wstandout(view->window);
2794 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2795 	if (tc)
2796 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2797 	waddwstr(view->window, wline);
2798 	while (width < view->ncols) {
2799 		waddch(view->window, ' ');
2800 		width++;
2801 	}
2802 	if (tc)
2803 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2804 	if (view_needs_focus_indication(view))
2805 		wstandend(view->window);
2806 	free(wline);
2807 	if (limit <= 1)
2808 		goto done;
2809 
2810 	/* Grow author column size if necessary, and set view->maxx. */
2811 	entry = s->first_displayed_entry;
2812 	ncommits = 0;
2813 	view->maxx = 0;
2814 	while (entry) {
2815 		struct got_commit_object *c = entry->commit;
2816 		char *author, *eol, *msg, *msg0;
2817 		wchar_t *wauthor, *wmsg;
2818 		int width;
2819 		if (ncommits >= limit - 1)
2820 			break;
2821 		if (s->use_committer)
2822 			author = strdup(got_object_commit_get_committer(c));
2823 		else
2824 			author = strdup(got_object_commit_get_author(c));
2825 		if (author == NULL) {
2826 			err = got_error_from_errno("strdup");
2827 			goto done;
2828 		}
2829 		err = format_author(&wauthor, &width, author, COLS,
2830 		    date_display_cols);
2831 		if (author_cols < width)
2832 			author_cols = width;
2833 		free(wauthor);
2834 		free(author);
2835 		if (err)
2836 			goto done;
2837 		err = got_object_commit_get_logmsg(&msg0, c);
2838 		if (err)
2839 			goto done;
2840 		msg = msg0;
2841 		while (*msg == '\n')
2842 			++msg;
2843 		if ((eol = strchr(msg, '\n')))
2844 			*eol = '\0';
2845 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2846 		    date_display_cols + author_cols, 0);
2847 		if (err)
2848 			goto done;
2849 		view->maxx = MAX(view->maxx, width);
2850 		free(msg0);
2851 		free(wmsg);
2852 		ncommits++;
2853 		entry = TAILQ_NEXT(entry, entry);
2854 	}
2855 
2856 	entry = s->first_displayed_entry;
2857 	s->last_displayed_entry = s->first_displayed_entry;
2858 	ncommits = 0;
2859 	while (entry) {
2860 		if (ncommits >= limit - 1)
2861 			break;
2862 		if (ncommits == s->selected)
2863 			wstandout(view->window);
2864 		err = draw_commit(view, entry->commit, entry->id,
2865 		    date_display_cols, author_cols);
2866 		if (ncommits == s->selected)
2867 			wstandend(view->window);
2868 		if (err)
2869 			goto done;
2870 		ncommits++;
2871 		s->last_displayed_entry = entry;
2872 		entry = TAILQ_NEXT(entry, entry);
2873 	}
2874 
2875 	view_border(view);
2876 done:
2877 	free(id_str);
2878 	free(refs_str);
2879 	free(ncommits_str);
2880 	free(header);
2881 	return err;
2882 }
2883 
2884 static void
2885 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2886 {
2887 	struct commit_queue_entry *entry;
2888 	int nscrolled = 0;
2889 
2890 	entry = TAILQ_FIRST(&s->commits->head);
2891 	if (s->first_displayed_entry == entry)
2892 		return;
2893 
2894 	entry = s->first_displayed_entry;
2895 	while (entry && nscrolled < maxscroll) {
2896 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2897 		if (entry) {
2898 			s->first_displayed_entry = entry;
2899 			nscrolled++;
2900 		}
2901 	}
2902 }
2903 
2904 static const struct got_error *
2905 trigger_log_thread(struct tog_view *view, int wait)
2906 {
2907 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2908 	int errcode;
2909 
2910 	if (!using_mock_io)
2911 		halfdelay(1); /* fast refresh while loading commits */
2912 
2913 	while (!ta->log_complete && !tog_thread_error &&
2914 	    (ta->commits_needed > 0 || ta->load_all)) {
2915 		/* Wake the log thread. */
2916 		errcode = pthread_cond_signal(&ta->need_commits);
2917 		if (errcode)
2918 			return got_error_set_errno(errcode,
2919 			    "pthread_cond_signal");
2920 
2921 		/*
2922 		 * The mutex will be released while the view loop waits
2923 		 * in wgetch(), at which time the log thread will run.
2924 		 */
2925 		if (!wait)
2926 			break;
2927 
2928 		/* Display progress update in log view. */
2929 		show_log_view(view);
2930 		update_panels();
2931 		doupdate();
2932 
2933 		/* Wait right here while next commit is being loaded. */
2934 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2935 		if (errcode)
2936 			return got_error_set_errno(errcode,
2937 			    "pthread_cond_wait");
2938 
2939 		/* Display progress update in log view. */
2940 		show_log_view(view);
2941 		update_panels();
2942 		doupdate();
2943 	}
2944 
2945 	return NULL;
2946 }
2947 
2948 static const struct got_error *
2949 request_log_commits(struct tog_view *view)
2950 {
2951 	struct tog_log_view_state	*state = &view->state.log;
2952 	const struct got_error		*err = NULL;
2953 
2954 	if (state->thread_args.log_complete)
2955 		return NULL;
2956 
2957 	state->thread_args.commits_needed += view->nscrolled;
2958 	err = trigger_log_thread(view, 1);
2959 	view->nscrolled = 0;
2960 
2961 	return err;
2962 }
2963 
2964 static const struct got_error *
2965 log_scroll_down(struct tog_view *view, int maxscroll)
2966 {
2967 	struct tog_log_view_state *s = &view->state.log;
2968 	const struct got_error *err = NULL;
2969 	struct commit_queue_entry *pentry;
2970 	int nscrolled = 0, ncommits_needed;
2971 
2972 	if (s->last_displayed_entry == NULL)
2973 		return NULL;
2974 
2975 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2976 	if (s->commits->ncommits < ncommits_needed &&
2977 	    !s->thread_args.log_complete) {
2978 		/*
2979 		 * Ask the log thread for required amount of commits.
2980 		 */
2981 		s->thread_args.commits_needed +=
2982 		    ncommits_needed - s->commits->ncommits;
2983 		err = trigger_log_thread(view, 1);
2984 		if (err)
2985 			return err;
2986 	}
2987 
2988 	do {
2989 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2990 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2991 			break;
2992 
2993 		s->last_displayed_entry = pentry ?
2994 		    pentry : s->last_displayed_entry;
2995 
2996 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2997 		if (pentry == NULL)
2998 			break;
2999 		s->first_displayed_entry = pentry;
3000 	} while (++nscrolled < maxscroll);
3001 
3002 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3003 		view->nscrolled += nscrolled;
3004 	else
3005 		view->nscrolled = 0;
3006 
3007 	return err;
3008 }
3009 
3010 static const struct got_error *
3011 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3012     struct got_commit_object *commit, struct got_object_id *commit_id,
3013     struct tog_view *log_view, struct got_repository *repo)
3014 {
3015 	const struct got_error *err;
3016 	struct got_object_qid *parent_id;
3017 	struct tog_view *diff_view;
3018 
3019 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3020 	if (diff_view == NULL)
3021 		return got_error_from_errno("view_open");
3022 
3023 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3024 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3025 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3026 	if (err == NULL)
3027 		*new_view = diff_view;
3028 	return err;
3029 }
3030 
3031 static const struct got_error *
3032 tree_view_visit_subtree(struct tog_tree_view_state *s,
3033     struct got_tree_object *subtree)
3034 {
3035 	struct tog_parent_tree *parent;
3036 
3037 	parent = calloc(1, sizeof(*parent));
3038 	if (parent == NULL)
3039 		return got_error_from_errno("calloc");
3040 
3041 	parent->tree = s->tree;
3042 	parent->first_displayed_entry = s->first_displayed_entry;
3043 	parent->selected_entry = s->selected_entry;
3044 	parent->selected = s->selected;
3045 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3046 	s->tree = subtree;
3047 	s->selected = 0;
3048 	s->first_displayed_entry = NULL;
3049 	return NULL;
3050 }
3051 
3052 static const struct got_error *
3053 tree_view_walk_path(struct tog_tree_view_state *s,
3054     struct got_commit_object *commit, const char *path)
3055 {
3056 	const struct got_error *err = NULL;
3057 	struct got_tree_object *tree = NULL;
3058 	const char *p;
3059 	char *slash, *subpath = NULL;
3060 
3061 	/* Walk the path and open corresponding tree objects. */
3062 	p = path;
3063 	while (*p) {
3064 		struct got_tree_entry *te;
3065 		struct got_object_id *tree_id;
3066 		char *te_name;
3067 
3068 		while (p[0] == '/')
3069 			p++;
3070 
3071 		/* Ensure the correct subtree entry is selected. */
3072 		slash = strchr(p, '/');
3073 		if (slash == NULL)
3074 			te_name = strdup(p);
3075 		else
3076 			te_name = strndup(p, slash - p);
3077 		if (te_name == NULL) {
3078 			err = got_error_from_errno("strndup");
3079 			break;
3080 		}
3081 		te = got_object_tree_find_entry(s->tree, te_name);
3082 		if (te == NULL) {
3083 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3084 			free(te_name);
3085 			break;
3086 		}
3087 		free(te_name);
3088 		s->first_displayed_entry = s->selected_entry = te;
3089 
3090 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3091 			break; /* jump to this file's entry */
3092 
3093 		slash = strchr(p, '/');
3094 		if (slash)
3095 			subpath = strndup(path, slash - path);
3096 		else
3097 			subpath = strdup(path);
3098 		if (subpath == NULL) {
3099 			err = got_error_from_errno("strdup");
3100 			break;
3101 		}
3102 
3103 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3104 		    subpath);
3105 		if (err)
3106 			break;
3107 
3108 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3109 		free(tree_id);
3110 		if (err)
3111 			break;
3112 
3113 		err = tree_view_visit_subtree(s, tree);
3114 		if (err) {
3115 			got_object_tree_close(tree);
3116 			break;
3117 		}
3118 		if (slash == NULL)
3119 			break;
3120 		free(subpath);
3121 		subpath = NULL;
3122 		p = slash;
3123 	}
3124 
3125 	free(subpath);
3126 	return err;
3127 }
3128 
3129 static const struct got_error *
3130 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3131     struct commit_queue_entry *entry, const char *path,
3132     const char *head_ref_name, struct got_repository *repo)
3133 {
3134 	const struct got_error *err = NULL;
3135 	struct tog_tree_view_state *s;
3136 	struct tog_view *tree_view;
3137 
3138 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3139 	if (tree_view == NULL)
3140 		return got_error_from_errno("view_open");
3141 
3142 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3143 	if (err)
3144 		return err;
3145 	s = &tree_view->state.tree;
3146 
3147 	*new_view = tree_view;
3148 
3149 	if (got_path_is_root_dir(path))
3150 		return NULL;
3151 
3152 	return tree_view_walk_path(s, entry->commit, path);
3153 }
3154 
3155 static const struct got_error *
3156 block_signals_used_by_main_thread(void)
3157 {
3158 	sigset_t sigset;
3159 	int errcode;
3160 
3161 	if (sigemptyset(&sigset) == -1)
3162 		return got_error_from_errno("sigemptyset");
3163 
3164 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3165 	if (sigaddset(&sigset, SIGWINCH) == -1)
3166 		return got_error_from_errno("sigaddset");
3167 	if (sigaddset(&sigset, SIGCONT) == -1)
3168 		return got_error_from_errno("sigaddset");
3169 	if (sigaddset(&sigset, SIGINT) == -1)
3170 		return got_error_from_errno("sigaddset");
3171 	if (sigaddset(&sigset, SIGTERM) == -1)
3172 		return got_error_from_errno("sigaddset");
3173 
3174 	/* ncurses handles SIGTSTP */
3175 	if (sigaddset(&sigset, SIGTSTP) == -1)
3176 		return got_error_from_errno("sigaddset");
3177 
3178 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3179 	if (errcode)
3180 		return got_error_set_errno(errcode, "pthread_sigmask");
3181 
3182 	return NULL;
3183 }
3184 
3185 static void *
3186 log_thread(void *arg)
3187 {
3188 	const struct got_error *err = NULL;
3189 	int errcode = 0;
3190 	struct tog_log_thread_args *a = arg;
3191 	int done = 0;
3192 
3193 	/*
3194 	 * Sync startup with main thread such that we begin our
3195 	 * work once view_input() has released the mutex.
3196 	 */
3197 	errcode = pthread_mutex_lock(&tog_mutex);
3198 	if (errcode) {
3199 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3200 		return (void *)err;
3201 	}
3202 
3203 	err = block_signals_used_by_main_thread();
3204 	if (err) {
3205 		pthread_mutex_unlock(&tog_mutex);
3206 		goto done;
3207 	}
3208 
3209 	while (!done && !err && !tog_fatal_signal_received()) {
3210 		errcode = pthread_mutex_unlock(&tog_mutex);
3211 		if (errcode) {
3212 			err = got_error_set_errno(errcode,
3213 			    "pthread_mutex_unlock");
3214 			goto done;
3215 		}
3216 		err = queue_commits(a);
3217 		if (err) {
3218 			if (err->code != GOT_ERR_ITER_COMPLETED)
3219 				goto done;
3220 			err = NULL;
3221 			done = 1;
3222 		} else if (a->commits_needed > 0 && !a->load_all) {
3223 			if (*a->limiting) {
3224 				if (a->limit_match)
3225 					a->commits_needed--;
3226 			} else
3227 				a->commits_needed--;
3228 		}
3229 
3230 		errcode = pthread_mutex_lock(&tog_mutex);
3231 		if (errcode) {
3232 			err = got_error_set_errno(errcode,
3233 			    "pthread_mutex_lock");
3234 			goto done;
3235 		} else if (*a->quit)
3236 			done = 1;
3237 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3238 			*a->first_displayed_entry =
3239 			    TAILQ_FIRST(&a->limit_commits->head);
3240 			*a->selected_entry = *a->first_displayed_entry;
3241 		} else if (*a->first_displayed_entry == NULL) {
3242 			*a->first_displayed_entry =
3243 			    TAILQ_FIRST(&a->real_commits->head);
3244 			*a->selected_entry = *a->first_displayed_entry;
3245 		}
3246 
3247 		errcode = pthread_cond_signal(&a->commit_loaded);
3248 		if (errcode) {
3249 			err = got_error_set_errno(errcode,
3250 			    "pthread_cond_signal");
3251 			pthread_mutex_unlock(&tog_mutex);
3252 			goto done;
3253 		}
3254 
3255 		if (done)
3256 			a->commits_needed = 0;
3257 		else {
3258 			if (a->commits_needed == 0 && !a->load_all) {
3259 				errcode = pthread_cond_wait(&a->need_commits,
3260 				    &tog_mutex);
3261 				if (errcode) {
3262 					err = got_error_set_errno(errcode,
3263 					    "pthread_cond_wait");
3264 					pthread_mutex_unlock(&tog_mutex);
3265 					goto done;
3266 				}
3267 				if (*a->quit)
3268 					done = 1;
3269 			}
3270 		}
3271 	}
3272 	a->log_complete = 1;
3273 	errcode = pthread_mutex_unlock(&tog_mutex);
3274 	if (errcode)
3275 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3276 done:
3277 	if (err) {
3278 		tog_thread_error = 1;
3279 		pthread_cond_signal(&a->commit_loaded);
3280 	}
3281 	return (void *)err;
3282 }
3283 
3284 static const struct got_error *
3285 stop_log_thread(struct tog_log_view_state *s)
3286 {
3287 	const struct got_error *err = NULL, *thread_err = NULL;
3288 	int errcode;
3289 
3290 	if (s->thread) {
3291 		s->quit = 1;
3292 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3293 		if (errcode)
3294 			return got_error_set_errno(errcode,
3295 			    "pthread_cond_signal");
3296 		errcode = pthread_mutex_unlock(&tog_mutex);
3297 		if (errcode)
3298 			return got_error_set_errno(errcode,
3299 			    "pthread_mutex_unlock");
3300 		errcode = pthread_join(s->thread, (void **)&thread_err);
3301 		if (errcode)
3302 			return got_error_set_errno(errcode, "pthread_join");
3303 		errcode = pthread_mutex_lock(&tog_mutex);
3304 		if (errcode)
3305 			return got_error_set_errno(errcode,
3306 			    "pthread_mutex_lock");
3307 		s->thread = 0; //NULL;
3308 	}
3309 
3310 	if (s->thread_args.repo) {
3311 		err = got_repo_close(s->thread_args.repo);
3312 		s->thread_args.repo = NULL;
3313 	}
3314 
3315 	if (s->thread_args.pack_fds) {
3316 		const struct got_error *pack_err =
3317 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3318 		if (err == NULL)
3319 			err = pack_err;
3320 		s->thread_args.pack_fds = NULL;
3321 	}
3322 
3323 	if (s->thread_args.graph) {
3324 		got_commit_graph_close(s->thread_args.graph);
3325 		s->thread_args.graph = NULL;
3326 	}
3327 
3328 	return err ? err : thread_err;
3329 }
3330 
3331 static const struct got_error *
3332 close_log_view(struct tog_view *view)
3333 {
3334 	const struct got_error *err = NULL;
3335 	struct tog_log_view_state *s = &view->state.log;
3336 	int errcode;
3337 
3338 	err = stop_log_thread(s);
3339 
3340 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3341 	if (errcode && err == NULL)
3342 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3343 
3344 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3345 	if (errcode && err == NULL)
3346 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3347 
3348 	free_commits(&s->limit_commits);
3349 	free_commits(&s->real_commits);
3350 	free(s->in_repo_path);
3351 	s->in_repo_path = NULL;
3352 	free(s->start_id);
3353 	s->start_id = NULL;
3354 	free(s->head_ref_name);
3355 	s->head_ref_name = NULL;
3356 	return err;
3357 }
3358 
3359 /*
3360  * We use two queues to implement the limit feature: first consists of
3361  * commits matching the current limit_regex; second is the real queue
3362  * of all known commits (real_commits). When the user starts limiting,
3363  * we swap queues such that all movement and displaying functionality
3364  * works with very slight change.
3365  */
3366 static const struct got_error *
3367 limit_log_view(struct tog_view *view)
3368 {
3369 	struct tog_log_view_state *s = &view->state.log;
3370 	struct commit_queue_entry *entry;
3371 	struct tog_view	*v = view;
3372 	const struct got_error *err = NULL;
3373 	char pattern[1024];
3374 	int ret;
3375 
3376 	if (view_is_hsplit_top(view))
3377 		v = view->child;
3378 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3379 		v = view->parent;
3380 
3381 	/* Get the pattern */
3382 	wmove(v->window, v->nlines - 1, 0);
3383 	wclrtoeol(v->window);
3384 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3385 	nodelay(v->window, FALSE);
3386 	nocbreak();
3387 	echo();
3388 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3389 	cbreak();
3390 	noecho();
3391 	nodelay(v->window, TRUE);
3392 	if (ret == ERR)
3393 		return NULL;
3394 
3395 	if (*pattern == '\0') {
3396 		/*
3397 		 * Safety measure for the situation where the user
3398 		 * resets limit without previously limiting anything.
3399 		 */
3400 		if (!s->limit_view)
3401 			return NULL;
3402 
3403 		/*
3404 		 * User could have pressed Ctrl+L, which refreshed the
3405 		 * commit queues, it means we can't save previously
3406 		 * (before limit took place) displayed entries,
3407 		 * because they would point to already free'ed memory,
3408 		 * so we are forced to always select first entry of
3409 		 * the queue.
3410 		 */
3411 		s->commits = &s->real_commits;
3412 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3413 		s->selected_entry = s->first_displayed_entry;
3414 		s->selected = 0;
3415 		s->limit_view = 0;
3416 
3417 		return NULL;
3418 	}
3419 
3420 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3421 		return NULL;
3422 
3423 	s->limit_view = 1;
3424 
3425 	/* Clear the screen while loading limit view */
3426 	s->first_displayed_entry = NULL;
3427 	s->last_displayed_entry = NULL;
3428 	s->selected_entry = NULL;
3429 	s->commits = &s->limit_commits;
3430 
3431 	/* Prepare limit queue for new search */
3432 	free_commits(&s->limit_commits);
3433 	s->limit_commits.ncommits = 0;
3434 
3435 	/* First process commits, which are in queue already */
3436 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3437 		int have_match = 0;
3438 
3439 		err = match_commit(&have_match, entry->id,
3440 		    entry->commit, &s->limit_regex);
3441 		if (err)
3442 			return err;
3443 
3444 		if (have_match) {
3445 			struct commit_queue_entry *matched;
3446 
3447 			matched = alloc_commit_queue_entry(entry->commit,
3448 			    entry->id);
3449 			if (matched == NULL) {
3450 				err = got_error_from_errno(
3451 				    "alloc_commit_queue_entry");
3452 				break;
3453 			}
3454 			matched->commit = entry->commit;
3455 			got_object_commit_retain(entry->commit);
3456 
3457 			matched->idx = s->limit_commits.ncommits;
3458 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3459 			    matched, entry);
3460 			s->limit_commits.ncommits++;
3461 		}
3462 	}
3463 
3464 	/* Second process all the commits, until we fill the screen */
3465 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3466 	    !s->thread_args.log_complete) {
3467 		s->thread_args.commits_needed +=
3468 		    view->nlines - s->limit_commits.ncommits - 1;
3469 		err = trigger_log_thread(view, 1);
3470 		if (err)
3471 			return err;
3472 	}
3473 
3474 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3475 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3476 	s->selected = 0;
3477 
3478 	return NULL;
3479 }
3480 
3481 static const struct got_error *
3482 search_start_log_view(struct tog_view *view)
3483 {
3484 	struct tog_log_view_state *s = &view->state.log;
3485 
3486 	s->matched_entry = NULL;
3487 	s->search_entry = NULL;
3488 	return NULL;
3489 }
3490 
3491 static const struct got_error *
3492 search_next_log_view(struct tog_view *view)
3493 {
3494 	const struct got_error *err = NULL;
3495 	struct tog_log_view_state *s = &view->state.log;
3496 	struct commit_queue_entry *entry;
3497 
3498 	/* Display progress update in log view. */
3499 	show_log_view(view);
3500 	update_panels();
3501 	doupdate();
3502 
3503 	if (s->search_entry) {
3504 		int errcode, ch;
3505 		errcode = pthread_mutex_unlock(&tog_mutex);
3506 		if (errcode)
3507 			return got_error_set_errno(errcode,
3508 			    "pthread_mutex_unlock");
3509 		ch = wgetch(view->window);
3510 		errcode = pthread_mutex_lock(&tog_mutex);
3511 		if (errcode)
3512 			return got_error_set_errno(errcode,
3513 			    "pthread_mutex_lock");
3514 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3515 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3516 			return NULL;
3517 		}
3518 		if (view->searching == TOG_SEARCH_FORWARD)
3519 			entry = TAILQ_NEXT(s->search_entry, entry);
3520 		else
3521 			entry = TAILQ_PREV(s->search_entry,
3522 			    commit_queue_head, entry);
3523 	} else if (s->matched_entry) {
3524 		/*
3525 		 * If the user has moved the cursor after we hit a match,
3526 		 * the position from where we should continue searching
3527 		 * might have changed.
3528 		 */
3529 		if (view->searching == TOG_SEARCH_FORWARD)
3530 			entry = TAILQ_NEXT(s->selected_entry, entry);
3531 		else
3532 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3533 			    entry);
3534 	} else {
3535 		entry = s->selected_entry;
3536 	}
3537 
3538 	while (1) {
3539 		int have_match = 0;
3540 
3541 		if (entry == NULL) {
3542 			if (s->thread_args.log_complete ||
3543 			    view->searching == TOG_SEARCH_BACKWARD) {
3544 				view->search_next_done =
3545 				    (s->matched_entry == NULL ?
3546 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3547 				s->search_entry = NULL;
3548 				return NULL;
3549 			}
3550 			/*
3551 			 * Poke the log thread for more commits and return,
3552 			 * allowing the main loop to make progress. Search
3553 			 * will resume at s->search_entry once we come back.
3554 			 */
3555 			s->thread_args.commits_needed++;
3556 			return trigger_log_thread(view, 0);
3557 		}
3558 
3559 		err = match_commit(&have_match, entry->id, entry->commit,
3560 		    &view->regex);
3561 		if (err)
3562 			break;
3563 		if (have_match) {
3564 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3565 			s->matched_entry = entry;
3566 			break;
3567 		}
3568 
3569 		s->search_entry = entry;
3570 		if (view->searching == TOG_SEARCH_FORWARD)
3571 			entry = TAILQ_NEXT(entry, entry);
3572 		else
3573 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3574 	}
3575 
3576 	if (s->matched_entry) {
3577 		int cur = s->selected_entry->idx;
3578 		while (cur < s->matched_entry->idx) {
3579 			err = input_log_view(NULL, view, KEY_DOWN);
3580 			if (err)
3581 				return err;
3582 			cur++;
3583 		}
3584 		while (cur > s->matched_entry->idx) {
3585 			err = input_log_view(NULL, view, KEY_UP);
3586 			if (err)
3587 				return err;
3588 			cur--;
3589 		}
3590 	}
3591 
3592 	s->search_entry = NULL;
3593 
3594 	return NULL;
3595 }
3596 
3597 static const struct got_error *
3598 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3599     struct got_repository *repo, const char *head_ref_name,
3600     const char *in_repo_path, int log_branches)
3601 {
3602 	const struct got_error *err = NULL;
3603 	struct tog_log_view_state *s = &view->state.log;
3604 	struct got_repository *thread_repo = NULL;
3605 	struct got_commit_graph *thread_graph = NULL;
3606 	int errcode;
3607 
3608 	if (in_repo_path != s->in_repo_path) {
3609 		free(s->in_repo_path);
3610 		s->in_repo_path = strdup(in_repo_path);
3611 		if (s->in_repo_path == NULL) {
3612 			err = got_error_from_errno("strdup");
3613 			goto done;
3614 		}
3615 	}
3616 
3617 	/* The commit queue only contains commits being displayed. */
3618 	TAILQ_INIT(&s->real_commits.head);
3619 	s->real_commits.ncommits = 0;
3620 	s->commits = &s->real_commits;
3621 
3622 	TAILQ_INIT(&s->limit_commits.head);
3623 	s->limit_view = 0;
3624 	s->limit_commits.ncommits = 0;
3625 
3626 	s->repo = repo;
3627 	if (head_ref_name) {
3628 		s->head_ref_name = strdup(head_ref_name);
3629 		if (s->head_ref_name == NULL) {
3630 			err = got_error_from_errno("strdup");
3631 			goto done;
3632 		}
3633 	}
3634 	s->start_id = got_object_id_dup(start_id);
3635 	if (s->start_id == NULL) {
3636 		err = got_error_from_errno("got_object_id_dup");
3637 		goto done;
3638 	}
3639 	s->log_branches = log_branches;
3640 	s->use_committer = 1;
3641 
3642 	STAILQ_INIT(&s->colors);
3643 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3644 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3645 		    get_color_value("TOG_COLOR_COMMIT"));
3646 		if (err)
3647 			goto done;
3648 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3649 		    get_color_value("TOG_COLOR_AUTHOR"));
3650 		if (err) {
3651 			free_colors(&s->colors);
3652 			goto done;
3653 		}
3654 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3655 		    get_color_value("TOG_COLOR_DATE"));
3656 		if (err) {
3657 			free_colors(&s->colors);
3658 			goto done;
3659 		}
3660 	}
3661 
3662 	view->show = show_log_view;
3663 	view->input = input_log_view;
3664 	view->resize = resize_log_view;
3665 	view->close = close_log_view;
3666 	view->search_start = search_start_log_view;
3667 	view->search_next = search_next_log_view;
3668 
3669 	if (s->thread_args.pack_fds == NULL) {
3670 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3671 		if (err)
3672 			goto done;
3673 	}
3674 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3675 	    s->thread_args.pack_fds);
3676 	if (err)
3677 		goto done;
3678 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3679 	    !s->log_branches);
3680 	if (err)
3681 		goto done;
3682 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3683 	    s->repo, NULL, NULL);
3684 	if (err)
3685 		goto done;
3686 
3687 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3688 	if (errcode) {
3689 		err = got_error_set_errno(errcode, "pthread_cond_init");
3690 		goto done;
3691 	}
3692 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3693 	if (errcode) {
3694 		err = got_error_set_errno(errcode, "pthread_cond_init");
3695 		goto done;
3696 	}
3697 
3698 	s->thread_args.commits_needed = view->nlines;
3699 	s->thread_args.graph = thread_graph;
3700 	s->thread_args.real_commits = &s->real_commits;
3701 	s->thread_args.limit_commits = &s->limit_commits;
3702 	s->thread_args.in_repo_path = s->in_repo_path;
3703 	s->thread_args.start_id = s->start_id;
3704 	s->thread_args.repo = thread_repo;
3705 	s->thread_args.log_complete = 0;
3706 	s->thread_args.quit = &s->quit;
3707 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3708 	s->thread_args.selected_entry = &s->selected_entry;
3709 	s->thread_args.searching = &view->searching;
3710 	s->thread_args.search_next_done = &view->search_next_done;
3711 	s->thread_args.regex = &view->regex;
3712 	s->thread_args.limiting = &s->limit_view;
3713 	s->thread_args.limit_regex = &s->limit_regex;
3714 	s->thread_args.limit_commits = &s->limit_commits;
3715 done:
3716 	if (err) {
3717 		if (view->close == NULL)
3718 			close_log_view(view);
3719 		view_close(view);
3720 	}
3721 	return err;
3722 }
3723 
3724 static const struct got_error *
3725 show_log_view(struct tog_view *view)
3726 {
3727 	const struct got_error *err;
3728 	struct tog_log_view_state *s = &view->state.log;
3729 
3730 	if (s->thread == 0) { //NULL) {
3731 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3732 		    &s->thread_args);
3733 		if (errcode)
3734 			return got_error_set_errno(errcode, "pthread_create");
3735 		if (s->thread_args.commits_needed > 0) {
3736 			err = trigger_log_thread(view, 1);
3737 			if (err)
3738 				return err;
3739 		}
3740 	}
3741 
3742 	return draw_commits(view);
3743 }
3744 
3745 static void
3746 log_move_cursor_up(struct tog_view *view, int page, int home)
3747 {
3748 	struct tog_log_view_state *s = &view->state.log;
3749 
3750 	if (s->first_displayed_entry == NULL)
3751 		return;
3752 	if (s->selected_entry->idx == 0)
3753 		view->count = 0;
3754 
3755 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3756 	    || home)
3757 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3758 
3759 	if (!page && !home && s->selected > 0)
3760 		--s->selected;
3761 	else
3762 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3763 
3764 	select_commit(s);
3765 	return;
3766 }
3767 
3768 static const struct got_error *
3769 log_move_cursor_down(struct tog_view *view, int page)
3770 {
3771 	struct tog_log_view_state	*s = &view->state.log;
3772 	const struct got_error		*err = NULL;
3773 	int				 eos = view->nlines - 2;
3774 
3775 	if (s->first_displayed_entry == NULL)
3776 		return NULL;
3777 
3778 	if (s->thread_args.log_complete &&
3779 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3780 		return NULL;
3781 
3782 	if (view_is_hsplit_top(view))
3783 		--eos;  /* border consumes the last line */
3784 
3785 	if (!page) {
3786 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3787 			++s->selected;
3788 		else
3789 			err = log_scroll_down(view, 1);
3790 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3791 		struct commit_queue_entry *entry;
3792 		int n;
3793 
3794 		s->selected = 0;
3795 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3796 		s->last_displayed_entry = entry;
3797 		for (n = 0; n <= eos; n++) {
3798 			if (entry == NULL)
3799 				break;
3800 			s->first_displayed_entry = entry;
3801 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3802 		}
3803 		if (n > 0)
3804 			s->selected = n - 1;
3805 	} else {
3806 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3807 		    s->thread_args.log_complete)
3808 			s->selected += MIN(page,
3809 			    s->commits->ncommits - s->selected_entry->idx - 1);
3810 		else
3811 			err = log_scroll_down(view, page);
3812 	}
3813 	if (err)
3814 		return err;
3815 
3816 	/*
3817 	 * We might necessarily overshoot in horizontal
3818 	 * splits; if so, select the last displayed commit.
3819 	 */
3820 	if (s->first_displayed_entry && s->last_displayed_entry) {
3821 		s->selected = MIN(s->selected,
3822 		    s->last_displayed_entry->idx -
3823 		    s->first_displayed_entry->idx);
3824 	}
3825 
3826 	select_commit(s);
3827 
3828 	if (s->thread_args.log_complete &&
3829 	    s->selected_entry->idx == s->commits->ncommits - 1)
3830 		view->count = 0;
3831 
3832 	return NULL;
3833 }
3834 
3835 static void
3836 view_get_split(struct tog_view *view, int *y, int *x)
3837 {
3838 	*x = 0;
3839 	*y = 0;
3840 
3841 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3842 		if (view->child && view->child->resized_y)
3843 			*y = view->child->resized_y;
3844 		else if (view->resized_y)
3845 			*y = view->resized_y;
3846 		else
3847 			*y = view_split_begin_y(view->lines);
3848 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3849 		if (view->child && view->child->resized_x)
3850 			*x = view->child->resized_x;
3851 		else if (view->resized_x)
3852 			*x = view->resized_x;
3853 		else
3854 			*x = view_split_begin_x(view->begin_x);
3855 	}
3856 }
3857 
3858 /* Split view horizontally at y and offset view->state->selected line. */
3859 static const struct got_error *
3860 view_init_hsplit(struct tog_view *view, int y)
3861 {
3862 	const struct got_error *err = NULL;
3863 
3864 	view->nlines = y;
3865 	view->ncols = COLS;
3866 	err = view_resize(view);
3867 	if (err)
3868 		return err;
3869 
3870 	err = offset_selection_down(view);
3871 
3872 	return err;
3873 }
3874 
3875 static const struct got_error *
3876 log_goto_line(struct tog_view *view, int nlines)
3877 {
3878 	const struct got_error		*err = NULL;
3879 	struct tog_log_view_state	*s = &view->state.log;
3880 	int				 g, idx = s->selected_entry->idx;
3881 
3882 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3883 		return NULL;
3884 
3885 	g = view->gline;
3886 	view->gline = 0;
3887 
3888 	if (g >= s->first_displayed_entry->idx + 1 &&
3889 	    g <= s->last_displayed_entry->idx + 1 &&
3890 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3891 		s->selected = g - s->first_displayed_entry->idx - 1;
3892 		select_commit(s);
3893 		return NULL;
3894 	}
3895 
3896 	if (idx + 1 < g) {
3897 		err = log_move_cursor_down(view, g - idx - 1);
3898 		if (!err && g > s->selected_entry->idx + 1)
3899 			err = log_move_cursor_down(view,
3900 			    g - s->first_displayed_entry->idx - 1);
3901 		if (err)
3902 			return err;
3903 	} else if (idx + 1 > g)
3904 		log_move_cursor_up(view, idx - g + 1, 0);
3905 
3906 	if (g < nlines && s->first_displayed_entry->idx == 0)
3907 		s->selected = g - 1;
3908 
3909 	select_commit(s);
3910 	return NULL;
3911 
3912 }
3913 
3914 static void
3915 horizontal_scroll_input(struct tog_view *view, int ch)
3916 {
3917 
3918 	switch (ch) {
3919 	case KEY_LEFT:
3920 	case 'h':
3921 		view->x -= MIN(view->x, 2);
3922 		if (view->x <= 0)
3923 			view->count = 0;
3924 		break;
3925 	case KEY_RIGHT:
3926 	case 'l':
3927 		if (view->x + view->ncols / 2 < view->maxx)
3928 			view->x += 2;
3929 		else
3930 			view->count = 0;
3931 		break;
3932 	case '0':
3933 		view->x = 0;
3934 		break;
3935 	case '$':
3936 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3937 		view->count = 0;
3938 		break;
3939 	default:
3940 		break;
3941 	}
3942 }
3943 
3944 static const struct got_error *
3945 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3946 {
3947 	const struct got_error *err = NULL;
3948 	struct tog_log_view_state *s = &view->state.log;
3949 	int eos, nscroll;
3950 
3951 	if (s->thread_args.load_all) {
3952 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3953 			s->thread_args.load_all = 0;
3954 		else if (s->thread_args.log_complete) {
3955 			err = log_move_cursor_down(view, s->commits->ncommits);
3956 			s->thread_args.load_all = 0;
3957 		}
3958 		if (err)
3959 			return err;
3960 	}
3961 
3962 	eos = nscroll = view->nlines - 1;
3963 	if (view_is_hsplit_top(view))
3964 		--eos;  /* border */
3965 
3966 	if (view->gline)
3967 		return log_goto_line(view, eos);
3968 
3969 	switch (ch) {
3970 	case '&':
3971 		err = limit_log_view(view);
3972 		break;
3973 	case 'q':
3974 		s->quit = 1;
3975 		break;
3976 	case '0':
3977 	case '$':
3978 	case KEY_RIGHT:
3979 	case 'l':
3980 	case KEY_LEFT:
3981 	case 'h':
3982 		horizontal_scroll_input(view, ch);
3983 		break;
3984 	case 'k':
3985 	case KEY_UP:
3986 	case '<':
3987 	case ',':
3988 	case CTRL('p'):
3989 		log_move_cursor_up(view, 0, 0);
3990 		break;
3991 	case 'g':
3992 	case '=':
3993 	case KEY_HOME:
3994 		log_move_cursor_up(view, 0, 1);
3995 		view->count = 0;
3996 		break;
3997 	case CTRL('u'):
3998 	case 'u':
3999 		nscroll /= 2;
4000 		/* FALL THROUGH */
4001 	case KEY_PPAGE:
4002 	case CTRL('b'):
4003 	case 'b':
4004 		log_move_cursor_up(view, nscroll, 0);
4005 		break;
4006 	case 'j':
4007 	case KEY_DOWN:
4008 	case '>':
4009 	case '.':
4010 	case CTRL('n'):
4011 		err = log_move_cursor_down(view, 0);
4012 		break;
4013 	case '@':
4014 		s->use_committer = !s->use_committer;
4015 		view->action = s->use_committer ?
4016 		    "show committer" : "show commit author";
4017 		break;
4018 	case 'G':
4019 	case '*':
4020 	case KEY_END: {
4021 		/* We don't know yet how many commits, so we're forced to
4022 		 * traverse them all. */
4023 		view->count = 0;
4024 		s->thread_args.load_all = 1;
4025 		if (!s->thread_args.log_complete)
4026 			return trigger_log_thread(view, 0);
4027 		err = log_move_cursor_down(view, s->commits->ncommits);
4028 		s->thread_args.load_all = 0;
4029 		break;
4030 	}
4031 	case CTRL('d'):
4032 	case 'd':
4033 		nscroll /= 2;
4034 		/* FALL THROUGH */
4035 	case KEY_NPAGE:
4036 	case CTRL('f'):
4037 	case 'f':
4038 	case ' ':
4039 		err = log_move_cursor_down(view, nscroll);
4040 		break;
4041 	case KEY_RESIZE:
4042 		if (s->selected > view->nlines - 2)
4043 			s->selected = view->nlines - 2;
4044 		if (s->selected > s->commits->ncommits - 1)
4045 			s->selected = s->commits->ncommits - 1;
4046 		select_commit(s);
4047 		if (s->commits->ncommits < view->nlines - 1 &&
4048 		    !s->thread_args.log_complete) {
4049 			s->thread_args.commits_needed += (view->nlines - 1) -
4050 			    s->commits->ncommits;
4051 			err = trigger_log_thread(view, 1);
4052 		}
4053 		break;
4054 	case KEY_ENTER:
4055 	case '\r':
4056 		view->count = 0;
4057 		if (s->selected_entry == NULL)
4058 			break;
4059 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4060 		break;
4061 	case 'T':
4062 		view->count = 0;
4063 		if (s->selected_entry == NULL)
4064 			break;
4065 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4066 		break;
4067 	case KEY_BACKSPACE:
4068 	case CTRL('l'):
4069 	case 'B':
4070 		view->count = 0;
4071 		if (ch == KEY_BACKSPACE &&
4072 		    got_path_is_root_dir(s->in_repo_path))
4073 			break;
4074 		err = stop_log_thread(s);
4075 		if (err)
4076 			return err;
4077 		if (ch == KEY_BACKSPACE) {
4078 			char *parent_path;
4079 			err = got_path_dirname(&parent_path, s->in_repo_path);
4080 			if (err)
4081 				return err;
4082 			free(s->in_repo_path);
4083 			s->in_repo_path = parent_path;
4084 			s->thread_args.in_repo_path = s->in_repo_path;
4085 		} else if (ch == CTRL('l')) {
4086 			struct got_object_id *start_id;
4087 			err = got_repo_match_object_id(&start_id, NULL,
4088 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4089 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4090 			if (err) {
4091 				if (s->head_ref_name == NULL ||
4092 				    err->code != GOT_ERR_NOT_REF)
4093 					return err;
4094 				/* Try to cope with deleted references. */
4095 				free(s->head_ref_name);
4096 				s->head_ref_name = NULL;
4097 				err = got_repo_match_object_id(&start_id,
4098 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4099 				    &tog_refs, s->repo);
4100 				if (err)
4101 					return err;
4102 			}
4103 			free(s->start_id);
4104 			s->start_id = start_id;
4105 			s->thread_args.start_id = s->start_id;
4106 		} else /* 'B' */
4107 			s->log_branches = !s->log_branches;
4108 
4109 		if (s->thread_args.pack_fds == NULL) {
4110 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4111 			if (err)
4112 				return err;
4113 		}
4114 		err = got_repo_open(&s->thread_args.repo,
4115 		    got_repo_get_path(s->repo), NULL,
4116 		    s->thread_args.pack_fds);
4117 		if (err)
4118 			return err;
4119 		tog_free_refs();
4120 		err = tog_load_refs(s->repo, 0);
4121 		if (err)
4122 			return err;
4123 		err = got_commit_graph_open(&s->thread_args.graph,
4124 		    s->in_repo_path, !s->log_branches);
4125 		if (err)
4126 			return err;
4127 		err = got_commit_graph_iter_start(s->thread_args.graph,
4128 		    s->start_id, s->repo, NULL, NULL);
4129 		if (err)
4130 			return err;
4131 		free_commits(&s->real_commits);
4132 		free_commits(&s->limit_commits);
4133 		s->first_displayed_entry = NULL;
4134 		s->last_displayed_entry = NULL;
4135 		s->selected_entry = NULL;
4136 		s->selected = 0;
4137 		s->thread_args.log_complete = 0;
4138 		s->quit = 0;
4139 		s->thread_args.commits_needed = view->lines;
4140 		s->matched_entry = NULL;
4141 		s->search_entry = NULL;
4142 		view->offset = 0;
4143 		break;
4144 	case 'R':
4145 		view->count = 0;
4146 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4147 		break;
4148 	default:
4149 		view->count = 0;
4150 		break;
4151 	}
4152 
4153 	return err;
4154 }
4155 
4156 static const struct got_error *
4157 apply_unveil(const char *repo_path, const char *worktree_path)
4158 {
4159 	const struct got_error *error;
4160 
4161 #ifdef PROFILE
4162 	if (unveil("gmon.out", "rwc") != 0)
4163 		return got_error_from_errno2("unveil", "gmon.out");
4164 #endif
4165 	if (repo_path && unveil(repo_path, "r") != 0)
4166 		return got_error_from_errno2("unveil", repo_path);
4167 
4168 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4169 		return got_error_from_errno2("unveil", worktree_path);
4170 
4171 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4172 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4173 
4174 	error = got_privsep_unveil_exec_helpers();
4175 	if (error != NULL)
4176 		return error;
4177 
4178 	if (unveil(NULL, NULL) != 0)
4179 		return got_error_from_errno("unveil");
4180 
4181 	return NULL;
4182 }
4183 
4184 static const struct got_error *
4185 init_mock_term(const char *test_script_path)
4186 {
4187 	const struct got_error	*err = NULL;
4188 	const char *screen_dump_path;
4189 	int in;
4190 
4191 	if (test_script_path == NULL || *test_script_path == '\0')
4192 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4193 
4194 	tog_io.f = fopen(test_script_path, "re");
4195 	if (tog_io.f == NULL) {
4196 		err = got_error_from_errno_fmt("fopen: %s",
4197 		    test_script_path);
4198 		goto done;
4199 	}
4200 
4201 	/* test mode, we don't want any output */
4202 	tog_io.cout = fopen("/dev/null", "w+");
4203 	if (tog_io.cout == NULL) {
4204 		err = got_error_from_errno2("fopen", "/dev/null");
4205 		goto done;
4206 	}
4207 
4208 	in = dup(fileno(tog_io.cout));
4209 	if (in == -1) {
4210 		err = got_error_from_errno("dup");
4211 		goto done;
4212 	}
4213 	tog_io.cin = fdopen(in, "r");
4214 	if (tog_io.cin == NULL) {
4215 		err = got_error_from_errno("fdopen");
4216 		close(in);
4217 		goto done;
4218 	}
4219 
4220 	screen_dump_path = getenv("TOG_SCR_DUMP");
4221 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4222 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4223 	tog_io.sdump = fopen(screen_dump_path, "wex");
4224 	if (tog_io.sdump == NULL) {
4225 		err = got_error_from_errno2("fopen", screen_dump_path);
4226 		goto done;
4227 	}
4228 
4229 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4230 		err = got_error_from_errno("fseeko");
4231 		goto done;
4232 	}
4233 
4234 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4235 		err = got_error_msg(GOT_ERR_IO,
4236 		    "newterm: failed to initialise curses");
4237 
4238 	using_mock_io = 1;
4239 
4240 done:
4241 	if (err)
4242 		tog_io_close();
4243 	return err;
4244 }
4245 
4246 static void
4247 init_curses(void)
4248 {
4249 	/*
4250 	 * Override default signal handlers before starting ncurses.
4251 	 * This should prevent ncurses from installing its own
4252 	 * broken cleanup() signal handler.
4253 	 */
4254 	signal(SIGWINCH, tog_sigwinch);
4255 	signal(SIGPIPE, tog_sigpipe);
4256 	signal(SIGCONT, tog_sigcont);
4257 	signal(SIGINT, tog_sigint);
4258 	signal(SIGTERM, tog_sigterm);
4259 
4260 	if (using_mock_io) /* In test mode we use a fake terminal */
4261 		return;
4262 
4263 	initscr();
4264 
4265 	cbreak();
4266 	halfdelay(1); /* Fast refresh while initial view is loading. */
4267 	noecho();
4268 	nonl();
4269 	intrflush(stdscr, FALSE);
4270 	keypad(stdscr, TRUE);
4271 	curs_set(0);
4272 	if (getenv("TOG_COLORS") != NULL) {
4273 		start_color();
4274 		use_default_colors();
4275 	}
4276 
4277 	return;
4278 }
4279 
4280 static const struct got_error *
4281 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4282     struct got_repository *repo, struct got_worktree *worktree)
4283 {
4284 	const struct got_error *err = NULL;
4285 
4286 	if (argc == 0) {
4287 		*in_repo_path = strdup("/");
4288 		if (*in_repo_path == NULL)
4289 			return got_error_from_errno("strdup");
4290 		return NULL;
4291 	}
4292 
4293 	if (worktree) {
4294 		const char *prefix = got_worktree_get_path_prefix(worktree);
4295 		char *p;
4296 
4297 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4298 		if (err)
4299 			return err;
4300 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4301 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4302 		    p) == -1) {
4303 			err = got_error_from_errno("asprintf");
4304 			*in_repo_path = NULL;
4305 		}
4306 		free(p);
4307 	} else
4308 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4309 
4310 	return err;
4311 }
4312 
4313 static const struct got_error *
4314 cmd_log(int argc, char *argv[])
4315 {
4316 	const struct got_error *error;
4317 	struct got_repository *repo = NULL;
4318 	struct got_worktree *worktree = NULL;
4319 	struct got_object_id *start_id = NULL;
4320 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4321 	char *start_commit = NULL, *label = NULL;
4322 	struct got_reference *ref = NULL;
4323 	const char *head_ref_name = NULL;
4324 	int ch, log_branches = 0;
4325 	struct tog_view *view;
4326 	int *pack_fds = NULL;
4327 
4328 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4329 		switch (ch) {
4330 		case 'b':
4331 			log_branches = 1;
4332 			break;
4333 		case 'c':
4334 			start_commit = optarg;
4335 			break;
4336 		case 'r':
4337 			repo_path = realpath(optarg, NULL);
4338 			if (repo_path == NULL)
4339 				return got_error_from_errno2("realpath",
4340 				    optarg);
4341 			break;
4342 		default:
4343 			usage_log();
4344 			/* NOTREACHED */
4345 		}
4346 	}
4347 
4348 	argc -= optind;
4349 	argv += optind;
4350 
4351 	if (argc > 1)
4352 		usage_log();
4353 
4354 	error = got_repo_pack_fds_open(&pack_fds);
4355 	if (error != NULL)
4356 		goto done;
4357 
4358 	if (repo_path == NULL) {
4359 		cwd = getcwd(NULL, 0);
4360 		if (cwd == NULL)
4361 			return got_error_from_errno("getcwd");
4362 		error = got_worktree_open(&worktree, cwd);
4363 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4364 			goto done;
4365 		if (worktree)
4366 			repo_path =
4367 			    strdup(got_worktree_get_repo_path(worktree));
4368 		else
4369 			repo_path = strdup(cwd);
4370 		if (repo_path == NULL) {
4371 			error = got_error_from_errno("strdup");
4372 			goto done;
4373 		}
4374 	}
4375 
4376 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4377 	if (error != NULL)
4378 		goto done;
4379 
4380 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4381 	    repo, worktree);
4382 	if (error)
4383 		goto done;
4384 
4385 	init_curses();
4386 
4387 	error = apply_unveil(got_repo_get_path(repo),
4388 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4389 	if (error)
4390 		goto done;
4391 
4392 	/* already loaded by tog_log_with_path()? */
4393 	if (TAILQ_EMPTY(&tog_refs)) {
4394 		error = tog_load_refs(repo, 0);
4395 		if (error)
4396 			goto done;
4397 	}
4398 
4399 	if (start_commit == NULL) {
4400 		error = got_repo_match_object_id(&start_id, &label,
4401 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4402 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4403 		if (error)
4404 			goto done;
4405 		head_ref_name = label;
4406 	} else {
4407 		error = got_ref_open(&ref, repo, start_commit, 0);
4408 		if (error == NULL)
4409 			head_ref_name = got_ref_get_name(ref);
4410 		else if (error->code != GOT_ERR_NOT_REF)
4411 			goto done;
4412 		error = got_repo_match_object_id(&start_id, NULL,
4413 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4414 		if (error)
4415 			goto done;
4416 	}
4417 
4418 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4419 	if (view == NULL) {
4420 		error = got_error_from_errno("view_open");
4421 		goto done;
4422 	}
4423 	error = open_log_view(view, start_id, repo, head_ref_name,
4424 	    in_repo_path, log_branches);
4425 	if (error)
4426 		goto done;
4427 	if (worktree) {
4428 		/* Release work tree lock. */
4429 		got_worktree_close(worktree);
4430 		worktree = NULL;
4431 	}
4432 	error = view_loop(view);
4433 done:
4434 	free(in_repo_path);
4435 	free(repo_path);
4436 	free(cwd);
4437 	free(start_id);
4438 	free(label);
4439 	if (ref)
4440 		got_ref_close(ref);
4441 	if (repo) {
4442 		const struct got_error *close_err = got_repo_close(repo);
4443 		if (error == NULL)
4444 			error = close_err;
4445 	}
4446 	if (worktree)
4447 		got_worktree_close(worktree);
4448 	if (pack_fds) {
4449 		const struct got_error *pack_err =
4450 		    got_repo_pack_fds_close(pack_fds);
4451 		if (error == NULL)
4452 			error = pack_err;
4453 	}
4454 	tog_free_refs();
4455 	return error;
4456 }
4457 
4458 __dead static void
4459 usage_diff(void)
4460 {
4461 	endwin();
4462 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4463 	    "object1 object2\n", getprogname());
4464 	exit(1);
4465 }
4466 
4467 static int
4468 match_line(const char *line, regex_t *regex, size_t nmatch,
4469     regmatch_t *regmatch)
4470 {
4471 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4472 }
4473 
4474 static struct tog_color *
4475 match_color(struct tog_colors *colors, const char *line)
4476 {
4477 	struct tog_color *tc = NULL;
4478 
4479 	STAILQ_FOREACH(tc, colors, entry) {
4480 		if (match_line(line, &tc->regex, 0, NULL))
4481 			return tc;
4482 	}
4483 
4484 	return NULL;
4485 }
4486 
4487 static const struct got_error *
4488 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4489     WINDOW *window, int skipcol, regmatch_t *regmatch)
4490 {
4491 	const struct got_error *err = NULL;
4492 	char *exstr = NULL;
4493 	wchar_t *wline = NULL;
4494 	int rme, rms, n, width, scrollx;
4495 	int width0 = 0, width1 = 0, width2 = 0;
4496 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4497 
4498 	*wtotal = 0;
4499 
4500 	rms = regmatch->rm_so;
4501 	rme = regmatch->rm_eo;
4502 
4503 	err = expand_tab(&exstr, line);
4504 	if (err)
4505 		return err;
4506 
4507 	/* Split the line into 3 segments, according to match offsets. */
4508 	seg0 = strndup(exstr, rms);
4509 	if (seg0 == NULL) {
4510 		err = got_error_from_errno("strndup");
4511 		goto done;
4512 	}
4513 	seg1 = strndup(exstr + rms, rme - rms);
4514 	if (seg1 == NULL) {
4515 		err = got_error_from_errno("strndup");
4516 		goto done;
4517 	}
4518 	seg2 = strdup(exstr + rme);
4519 	if (seg2 == NULL) {
4520 		err = got_error_from_errno("strndup");
4521 		goto done;
4522 	}
4523 
4524 	/* draw up to matched token if we haven't scrolled past it */
4525 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4526 	    col_tab_align, 1);
4527 	if (err)
4528 		goto done;
4529 	n = MAX(width0 - skipcol, 0);
4530 	if (n) {
4531 		free(wline);
4532 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4533 		    wlimit, col_tab_align, 1);
4534 		if (err)
4535 			goto done;
4536 		waddwstr(window, &wline[scrollx]);
4537 		wlimit -= width;
4538 		*wtotal += width;
4539 	}
4540 
4541 	if (wlimit > 0) {
4542 		int i = 0, w = 0;
4543 		size_t wlen;
4544 
4545 		free(wline);
4546 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4547 		    col_tab_align, 1);
4548 		if (err)
4549 			goto done;
4550 		wlen = wcslen(wline);
4551 		while (i < wlen) {
4552 			width = wcwidth(wline[i]);
4553 			if (width == -1) {
4554 				/* should not happen, tabs are expanded */
4555 				err = got_error(GOT_ERR_RANGE);
4556 				goto done;
4557 			}
4558 			if (width0 + w + width > skipcol)
4559 				break;
4560 			w += width;
4561 			i++;
4562 		}
4563 		/* draw (visible part of) matched token (if scrolled into it) */
4564 		if (width1 - w > 0) {
4565 			wattron(window, A_STANDOUT);
4566 			waddwstr(window, &wline[i]);
4567 			wattroff(window, A_STANDOUT);
4568 			wlimit -= (width1 - w);
4569 			*wtotal += (width1 - w);
4570 		}
4571 	}
4572 
4573 	if (wlimit > 0) {  /* draw rest of line */
4574 		free(wline);
4575 		if (skipcol > width0 + width1) {
4576 			err = format_line(&wline, &width2, &scrollx, seg2,
4577 			    skipcol - (width0 + width1), wlimit,
4578 			    col_tab_align, 1);
4579 			if (err)
4580 				goto done;
4581 			waddwstr(window, &wline[scrollx]);
4582 		} else {
4583 			err = format_line(&wline, &width2, NULL, seg2, 0,
4584 			    wlimit, col_tab_align, 1);
4585 			if (err)
4586 				goto done;
4587 			waddwstr(window, wline);
4588 		}
4589 		*wtotal += width2;
4590 	}
4591 done:
4592 	free(wline);
4593 	free(exstr);
4594 	free(seg0);
4595 	free(seg1);
4596 	free(seg2);
4597 	return err;
4598 }
4599 
4600 static int
4601 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4602 {
4603 	FILE	*f = NULL;
4604 	int	*eof, *first, *selected;
4605 
4606 	if (view->type == TOG_VIEW_DIFF) {
4607 		struct tog_diff_view_state *s = &view->state.diff;
4608 
4609 		first = &s->first_displayed_line;
4610 		selected = first;
4611 		eof = &s->eof;
4612 		f = s->f;
4613 	} else if (view->type == TOG_VIEW_HELP) {
4614 		struct tog_help_view_state *s = &view->state.help;
4615 
4616 		first = &s->first_displayed_line;
4617 		selected = first;
4618 		eof = &s->eof;
4619 		f = s->f;
4620 	} else if (view->type == TOG_VIEW_BLAME) {
4621 		struct tog_blame_view_state *s = &view->state.blame;
4622 
4623 		first = &s->first_displayed_line;
4624 		selected = &s->selected_line;
4625 		eof = &s->eof;
4626 		f = s->blame.f;
4627 	} else
4628 		return 0;
4629 
4630 	/* Center gline in the middle of the page like vi(1). */
4631 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4632 		return 0;
4633 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4634 		rewind(f);
4635 		*eof = 0;
4636 		*first = 1;
4637 		*lineno = 0;
4638 		*nprinted = 0;
4639 		return 0;
4640 	}
4641 
4642 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4643 		view->gline : (view->nlines - 3) / 2 + 1;
4644 	view->gline = 0;
4645 
4646 	return 1;
4647 }
4648 
4649 static const struct got_error *
4650 draw_file(struct tog_view *view, const char *header)
4651 {
4652 	struct tog_diff_view_state *s = &view->state.diff;
4653 	regmatch_t *regmatch = &view->regmatch;
4654 	const struct got_error *err;
4655 	int nprinted = 0;
4656 	char *line;
4657 	size_t linesize = 0;
4658 	ssize_t linelen;
4659 	wchar_t *wline;
4660 	int width;
4661 	int max_lines = view->nlines;
4662 	int nlines = s->nlines;
4663 	off_t line_offset;
4664 
4665 	s->lineno = s->first_displayed_line - 1;
4666 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4667 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4668 		return got_error_from_errno("fseek");
4669 
4670 	werase(view->window);
4671 
4672 	if (view->gline > s->nlines - 1)
4673 		view->gline = s->nlines - 1;
4674 
4675 	if (header) {
4676 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4677 		    1 : view->gline - (view->nlines - 3) / 2 :
4678 		    s->lineno + s->selected_line;
4679 
4680 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4681 			return got_error_from_errno("asprintf");
4682 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4683 		    0, 0);
4684 		free(line);
4685 		if (err)
4686 			return err;
4687 
4688 		if (view_needs_focus_indication(view))
4689 			wstandout(view->window);
4690 		waddwstr(view->window, wline);
4691 		free(wline);
4692 		wline = NULL;
4693 		while (width++ < view->ncols)
4694 			waddch(view->window, ' ');
4695 		if (view_needs_focus_indication(view))
4696 			wstandend(view->window);
4697 
4698 		if (max_lines <= 1)
4699 			return NULL;
4700 		max_lines--;
4701 	}
4702 
4703 	s->eof = 0;
4704 	view->maxx = 0;
4705 	line = NULL;
4706 	while (max_lines > 0 && nprinted < max_lines) {
4707 		enum got_diff_line_type linetype;
4708 		attr_t attr = 0;
4709 
4710 		linelen = getline(&line, &linesize, s->f);
4711 		if (linelen == -1) {
4712 			if (feof(s->f)) {
4713 				s->eof = 1;
4714 				break;
4715 			}
4716 			free(line);
4717 			return got_ferror(s->f, GOT_ERR_IO);
4718 		}
4719 
4720 		if (++s->lineno < s->first_displayed_line)
4721 			continue;
4722 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4723 			continue;
4724 		if (s->lineno == view->hiline)
4725 			attr = A_STANDOUT;
4726 
4727 		/* Set view->maxx based on full line length. */
4728 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4729 		    view->x ? 1 : 0);
4730 		if (err) {
4731 			free(line);
4732 			return err;
4733 		}
4734 		view->maxx = MAX(view->maxx, width);
4735 		free(wline);
4736 		wline = NULL;
4737 
4738 		linetype = s->lines[s->lineno].type;
4739 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4740 		    linetype < GOT_DIFF_LINE_CONTEXT)
4741 			attr |= COLOR_PAIR(linetype);
4742 		if (attr)
4743 			wattron(view->window, attr);
4744 		if (s->first_displayed_line + nprinted == s->matched_line &&
4745 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4746 			err = add_matched_line(&width, line, view->ncols, 0,
4747 			    view->window, view->x, regmatch);
4748 			if (err) {
4749 				free(line);
4750 				return err;
4751 			}
4752 		} else {
4753 			int skip;
4754 			err = format_line(&wline, &width, &skip, line,
4755 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4756 			if (err) {
4757 				free(line);
4758 				return err;
4759 			}
4760 			waddwstr(view->window, &wline[skip]);
4761 			free(wline);
4762 			wline = NULL;
4763 		}
4764 		if (s->lineno == view->hiline) {
4765 			/* highlight full gline length */
4766 			while (width++ < view->ncols)
4767 				waddch(view->window, ' ');
4768 		} else {
4769 			if (width <= view->ncols - 1)
4770 				waddch(view->window, '\n');
4771 		}
4772 		if (attr)
4773 			wattroff(view->window, attr);
4774 		if (++nprinted == 1)
4775 			s->first_displayed_line = s->lineno;
4776 	}
4777 	free(line);
4778 	if (nprinted >= 1)
4779 		s->last_displayed_line = s->first_displayed_line +
4780 		    (nprinted - 1);
4781 	else
4782 		s->last_displayed_line = s->first_displayed_line;
4783 
4784 	view_border(view);
4785 
4786 	if (s->eof) {
4787 		while (nprinted < view->nlines) {
4788 			waddch(view->window, '\n');
4789 			nprinted++;
4790 		}
4791 
4792 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4793 		    view->ncols, 0, 0);
4794 		if (err) {
4795 			return err;
4796 		}
4797 
4798 		wstandout(view->window);
4799 		waddwstr(view->window, wline);
4800 		free(wline);
4801 		wline = NULL;
4802 		wstandend(view->window);
4803 	}
4804 
4805 	return NULL;
4806 }
4807 
4808 static char *
4809 get_datestr(time_t *time, char *datebuf)
4810 {
4811 	struct tm mytm, *tm;
4812 	char *p, *s;
4813 
4814 	tm = gmtime_r(time, &mytm);
4815 	if (tm == NULL)
4816 		return NULL;
4817 	s = asctime_r(tm, datebuf);
4818 	if (s == NULL)
4819 		return NULL;
4820 	p = strchr(s, '\n');
4821 	if (p)
4822 		*p = '\0';
4823 	return s;
4824 }
4825 
4826 static const struct got_error *
4827 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4828     off_t off, uint8_t type)
4829 {
4830 	struct got_diff_line *p;
4831 
4832 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4833 	if (p == NULL)
4834 		return got_error_from_errno("reallocarray");
4835 	*lines = p;
4836 	(*lines)[*nlines].offset = off;
4837 	(*lines)[*nlines].type = type;
4838 	(*nlines)++;
4839 
4840 	return NULL;
4841 }
4842 
4843 static const struct got_error *
4844 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4845     struct got_diff_line *s_lines, size_t s_nlines)
4846 {
4847 	struct got_diff_line	*p;
4848 	char			 buf[BUFSIZ];
4849 	size_t			 i, r;
4850 
4851 	if (fseeko(src, 0L, SEEK_SET) == -1)
4852 		return got_error_from_errno("fseeko");
4853 
4854 	for (;;) {
4855 		r = fread(buf, 1, sizeof(buf), src);
4856 		if (r == 0) {
4857 			if (ferror(src))
4858 				return got_error_from_errno("fread");
4859 			if (feof(src))
4860 				break;
4861 		}
4862 		if (fwrite(buf, 1, r, dst) != r)
4863 			return got_ferror(dst, GOT_ERR_IO);
4864 	}
4865 
4866 	if (s_nlines == 0 && *d_nlines == 0)
4867 		return NULL;
4868 
4869 	/*
4870 	 * If commit info was in dst, increment line offsets
4871 	 * of the appended diff content, but skip s_lines[0]
4872 	 * because offset zero is already in *d_lines.
4873 	 */
4874 	if (*d_nlines > 0) {
4875 		for (i = 1; i < s_nlines; ++i)
4876 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4877 
4878 		if (s_nlines > 0) {
4879 			--s_nlines;
4880 			++s_lines;
4881 		}
4882 	}
4883 
4884 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4885 	if (p == NULL) {
4886 		/* d_lines is freed in close_diff_view() */
4887 		return got_error_from_errno("reallocarray");
4888 	}
4889 
4890 	*d_lines = p;
4891 
4892 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4893 	*d_nlines += s_nlines;
4894 
4895 	return NULL;
4896 }
4897 
4898 static const struct got_error *
4899 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4900     struct got_object_id *commit_id, struct got_reflist_head *refs,
4901     struct got_repository *repo, int ignore_ws, int force_text_diff,
4902     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4903 {
4904 	const struct got_error *err = NULL;
4905 	char datebuf[26], *datestr;
4906 	struct got_commit_object *commit;
4907 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4908 	time_t committer_time;
4909 	const char *author, *committer;
4910 	char *refs_str = NULL;
4911 	struct got_pathlist_entry *pe;
4912 	off_t outoff = 0;
4913 	int n;
4914 
4915 	if (refs) {
4916 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4917 		if (err)
4918 			return err;
4919 	}
4920 
4921 	err = got_object_open_as_commit(&commit, repo, commit_id);
4922 	if (err)
4923 		return err;
4924 
4925 	err = got_object_id_str(&id_str, commit_id);
4926 	if (err) {
4927 		err = got_error_from_errno("got_object_id_str");
4928 		goto done;
4929 	}
4930 
4931 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4932 	if (err)
4933 		goto done;
4934 
4935 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4936 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4937 	if (n < 0) {
4938 		err = got_error_from_errno("fprintf");
4939 		goto done;
4940 	}
4941 	outoff += n;
4942 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4943 	if (err)
4944 		goto done;
4945 
4946 	n = fprintf(outfile, "from: %s\n",
4947 	    got_object_commit_get_author(commit));
4948 	if (n < 0) {
4949 		err = got_error_from_errno("fprintf");
4950 		goto done;
4951 	}
4952 	outoff += n;
4953 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4954 	if (err)
4955 		goto done;
4956 
4957 	author = got_object_commit_get_author(commit);
4958 	committer = got_object_commit_get_committer(commit);
4959 	if (strcmp(author, committer) != 0) {
4960 		n = fprintf(outfile, "via: %s\n", committer);
4961 		if (n < 0) {
4962 			err = got_error_from_errno("fprintf");
4963 			goto done;
4964 		}
4965 		outoff += n;
4966 		err = add_line_metadata(lines, nlines, outoff,
4967 		    GOT_DIFF_LINE_AUTHOR);
4968 		if (err)
4969 			goto done;
4970 	}
4971 	committer_time = got_object_commit_get_committer_time(commit);
4972 	datestr = get_datestr(&committer_time, datebuf);
4973 	if (datestr) {
4974 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4975 		if (n < 0) {
4976 			err = got_error_from_errno("fprintf");
4977 			goto done;
4978 		}
4979 		outoff += n;
4980 		err = add_line_metadata(lines, nlines, outoff,
4981 		    GOT_DIFF_LINE_DATE);
4982 		if (err)
4983 			goto done;
4984 	}
4985 	if (got_object_commit_get_nparents(commit) > 1) {
4986 		const struct got_object_id_queue *parent_ids;
4987 		struct got_object_qid *qid;
4988 		int pn = 1;
4989 		parent_ids = got_object_commit_get_parent_ids(commit);
4990 		STAILQ_FOREACH(qid, parent_ids, entry) {
4991 			err = got_object_id_str(&id_str, &qid->id);
4992 			if (err)
4993 				goto done;
4994 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4995 			if (n < 0) {
4996 				err = got_error_from_errno("fprintf");
4997 				goto done;
4998 			}
4999 			outoff += n;
5000 			err = add_line_metadata(lines, nlines, outoff,
5001 			    GOT_DIFF_LINE_META);
5002 			if (err)
5003 				goto done;
5004 			free(id_str);
5005 			id_str = NULL;
5006 		}
5007 	}
5008 
5009 	err = got_object_commit_get_logmsg(&logmsg, commit);
5010 	if (err)
5011 		goto done;
5012 	s = logmsg;
5013 	while ((line = strsep(&s, "\n")) != NULL) {
5014 		n = fprintf(outfile, "%s\n", line);
5015 		if (n < 0) {
5016 			err = got_error_from_errno("fprintf");
5017 			goto done;
5018 		}
5019 		outoff += n;
5020 		err = add_line_metadata(lines, nlines, outoff,
5021 		    GOT_DIFF_LINE_LOGMSG);
5022 		if (err)
5023 			goto done;
5024 	}
5025 
5026 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5027 		struct got_diff_changed_path *cp = pe->data;
5028 		int pad = dsa->max_path_len - pe->path_len + 1;
5029 
5030 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5031 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5032 		    dsa->rm_cols + 1, cp->rm);
5033 		if (n < 0) {
5034 			err = got_error_from_errno("fprintf");
5035 			goto done;
5036 		}
5037 		outoff += n;
5038 		err = add_line_metadata(lines, nlines, outoff,
5039 		    GOT_DIFF_LINE_CHANGES);
5040 		if (err)
5041 			goto done;
5042 	}
5043 
5044 	fputc('\n', outfile);
5045 	outoff++;
5046 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5047 	if (err)
5048 		goto done;
5049 
5050 	n = fprintf(outfile,
5051 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5052 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5053 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5054 	if (n < 0) {
5055 		err = got_error_from_errno("fprintf");
5056 		goto done;
5057 	}
5058 	outoff += n;
5059 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5060 	if (err)
5061 		goto done;
5062 
5063 	fputc('\n', outfile);
5064 	outoff++;
5065 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5066 done:
5067 	free(id_str);
5068 	free(logmsg);
5069 	free(refs_str);
5070 	got_object_commit_close(commit);
5071 	if (err) {
5072 		free(*lines);
5073 		*lines = NULL;
5074 		*nlines = 0;
5075 	}
5076 	return err;
5077 }
5078 
5079 static const struct got_error *
5080 create_diff(struct tog_diff_view_state *s)
5081 {
5082 	const struct got_error *err = NULL;
5083 	FILE *f = NULL, *tmp_diff_file = NULL;
5084 	int obj_type;
5085 	struct got_diff_line *lines = NULL;
5086 	struct got_pathlist_head changed_paths;
5087 
5088 	TAILQ_INIT(&changed_paths);
5089 
5090 	free(s->lines);
5091 	s->lines = malloc(sizeof(*s->lines));
5092 	if (s->lines == NULL)
5093 		return got_error_from_errno("malloc");
5094 	s->nlines = 0;
5095 
5096 	f = got_opentemp();
5097 	if (f == NULL) {
5098 		err = got_error_from_errno("got_opentemp");
5099 		goto done;
5100 	}
5101 	tmp_diff_file = got_opentemp();
5102 	if (tmp_diff_file == NULL) {
5103 		err = got_error_from_errno("got_opentemp");
5104 		goto done;
5105 	}
5106 	if (s->f && fclose(s->f) == EOF) {
5107 		err = got_error_from_errno("fclose");
5108 		goto done;
5109 	}
5110 	s->f = f;
5111 
5112 	if (s->id1)
5113 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5114 	else
5115 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5116 	if (err)
5117 		goto done;
5118 
5119 	switch (obj_type) {
5120 	case GOT_OBJ_TYPE_BLOB:
5121 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5122 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5123 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5124 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5125 		    s->f);
5126 		break;
5127 	case GOT_OBJ_TYPE_TREE:
5128 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5129 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5130 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5131 		    s->force_text_diff, NULL, s->repo, s->f);
5132 		break;
5133 	case GOT_OBJ_TYPE_COMMIT: {
5134 		const struct got_object_id_queue *parent_ids;
5135 		struct got_object_qid *pid;
5136 		struct got_commit_object *commit2;
5137 		struct got_reflist_head *refs;
5138 		size_t nlines = 0;
5139 		struct got_diffstat_cb_arg dsa = {
5140 			0, 0, 0, 0, 0, 0,
5141 			&changed_paths,
5142 			s->ignore_whitespace,
5143 			s->force_text_diff,
5144 			tog_diff_algo
5145 		};
5146 
5147 		lines = malloc(sizeof(*lines));
5148 		if (lines == NULL) {
5149 			err = got_error_from_errno("malloc");
5150 			goto done;
5151 		}
5152 
5153 		/* build diff first in tmp file then append to commit info */
5154 		err = got_diff_objects_as_commits(&lines, &nlines,
5155 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5156 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5157 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5158 		if (err)
5159 			break;
5160 
5161 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5162 		if (err)
5163 			goto done;
5164 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5165 		/* Show commit info if we're diffing to a parent/root commit. */
5166 		if (s->id1 == NULL) {
5167 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5168 			    refs, s->repo, s->ignore_whitespace,
5169 			    s->force_text_diff, &dsa, s->f);
5170 			if (err)
5171 				goto done;
5172 		} else {
5173 			parent_ids = got_object_commit_get_parent_ids(commit2);
5174 			STAILQ_FOREACH(pid, parent_ids, entry) {
5175 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5176 					err = write_commit_info(&s->lines,
5177 					    &s->nlines, s->id2, refs, s->repo,
5178 					    s->ignore_whitespace,
5179 					    s->force_text_diff, &dsa, s->f);
5180 					if (err)
5181 						goto done;
5182 					break;
5183 				}
5184 			}
5185 		}
5186 		got_object_commit_close(commit2);
5187 
5188 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5189 		    lines, nlines);
5190 		break;
5191 	}
5192 	default:
5193 		err = got_error(GOT_ERR_OBJ_TYPE);
5194 		break;
5195 	}
5196 done:
5197 	free(lines);
5198 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5199 	if (s->f && fflush(s->f) != 0 && err == NULL)
5200 		err = got_error_from_errno("fflush");
5201 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5202 		err = got_error_from_errno("fclose");
5203 	return err;
5204 }
5205 
5206 static void
5207 diff_view_indicate_progress(struct tog_view *view)
5208 {
5209 	mvwaddstr(view->window, 0, 0, "diffing...");
5210 	update_panels();
5211 	doupdate();
5212 }
5213 
5214 static const struct got_error *
5215 search_start_diff_view(struct tog_view *view)
5216 {
5217 	struct tog_diff_view_state *s = &view->state.diff;
5218 
5219 	s->matched_line = 0;
5220 	return NULL;
5221 }
5222 
5223 static void
5224 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5225     size_t *nlines, int **first, int **last, int **match, int **selected)
5226 {
5227 	struct tog_diff_view_state *s = &view->state.diff;
5228 
5229 	*f = s->f;
5230 	*nlines = s->nlines;
5231 	*line_offsets = NULL;
5232 	*match = &s->matched_line;
5233 	*first = &s->first_displayed_line;
5234 	*last = &s->last_displayed_line;
5235 	*selected = &s->selected_line;
5236 }
5237 
5238 static const struct got_error *
5239 search_next_view_match(struct tog_view *view)
5240 {
5241 	const struct got_error *err = NULL;
5242 	FILE *f;
5243 	int lineno;
5244 	char *line = NULL;
5245 	size_t linesize = 0;
5246 	ssize_t linelen;
5247 	off_t *line_offsets;
5248 	size_t nlines = 0;
5249 	int *first, *last, *match, *selected;
5250 
5251 	if (!view->search_setup)
5252 		return got_error_msg(GOT_ERR_NOT_IMPL,
5253 		    "view search not supported");
5254 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5255 	    &match, &selected);
5256 
5257 	if (!view->searching) {
5258 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5259 		return NULL;
5260 	}
5261 
5262 	if (*match) {
5263 		if (view->searching == TOG_SEARCH_FORWARD)
5264 			lineno = *first + 1;
5265 		else
5266 			lineno = *first - 1;
5267 	} else
5268 		lineno = *first - 1 + *selected;
5269 
5270 	while (1) {
5271 		off_t offset;
5272 
5273 		if (lineno <= 0 || lineno > nlines) {
5274 			if (*match == 0) {
5275 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5276 				break;
5277 			}
5278 
5279 			if (view->searching == TOG_SEARCH_FORWARD)
5280 				lineno = 1;
5281 			else
5282 				lineno = nlines;
5283 		}
5284 
5285 		offset = view->type == TOG_VIEW_DIFF ?
5286 		    view->state.diff.lines[lineno - 1].offset :
5287 		    line_offsets[lineno - 1];
5288 		if (fseeko(f, offset, SEEK_SET) != 0) {
5289 			free(line);
5290 			return got_error_from_errno("fseeko");
5291 		}
5292 		linelen = getline(&line, &linesize, f);
5293 		if (linelen != -1) {
5294 			char *exstr;
5295 			err = expand_tab(&exstr, line);
5296 			if (err)
5297 				break;
5298 			if (match_line(exstr, &view->regex, 1,
5299 			    &view->regmatch)) {
5300 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5301 				*match = lineno;
5302 				free(exstr);
5303 				break;
5304 			}
5305 			free(exstr);
5306 		}
5307 		if (view->searching == TOG_SEARCH_FORWARD)
5308 			lineno++;
5309 		else
5310 			lineno--;
5311 	}
5312 	free(line);
5313 
5314 	if (*match) {
5315 		*first = *match;
5316 		*selected = 1;
5317 	}
5318 
5319 	return err;
5320 }
5321 
5322 static const struct got_error *
5323 close_diff_view(struct tog_view *view)
5324 {
5325 	const struct got_error *err = NULL;
5326 	struct tog_diff_view_state *s = &view->state.diff;
5327 
5328 	free(s->id1);
5329 	s->id1 = NULL;
5330 	free(s->id2);
5331 	s->id2 = NULL;
5332 	if (s->f && fclose(s->f) == EOF)
5333 		err = got_error_from_errno("fclose");
5334 	s->f = NULL;
5335 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5336 		err = got_error_from_errno("fclose");
5337 	s->f1 = NULL;
5338 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5339 		err = got_error_from_errno("fclose");
5340 	s->f2 = NULL;
5341 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5342 		err = got_error_from_errno("close");
5343 	s->fd1 = -1;
5344 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5345 		err = got_error_from_errno("close");
5346 	s->fd2 = -1;
5347 	free(s->lines);
5348 	s->lines = NULL;
5349 	s->nlines = 0;
5350 	return err;
5351 }
5352 
5353 static const struct got_error *
5354 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5355     struct got_object_id *id2, const char *label1, const char *label2,
5356     int diff_context, int ignore_whitespace, int force_text_diff,
5357     struct tog_view *parent_view, struct got_repository *repo)
5358 {
5359 	const struct got_error *err;
5360 	struct tog_diff_view_state *s = &view->state.diff;
5361 
5362 	memset(s, 0, sizeof(*s));
5363 	s->fd1 = -1;
5364 	s->fd2 = -1;
5365 
5366 	if (id1 != NULL && id2 != NULL) {
5367 		int type1, type2;
5368 
5369 		err = got_object_get_type(&type1, repo, id1);
5370 		if (err)
5371 			goto done;
5372 		err = got_object_get_type(&type2, repo, id2);
5373 		if (err)
5374 			goto done;
5375 
5376 		if (type1 != type2) {
5377 			err = got_error(GOT_ERR_OBJ_TYPE);
5378 			goto done;
5379 		}
5380 	}
5381 	s->first_displayed_line = 1;
5382 	s->last_displayed_line = view->nlines;
5383 	s->selected_line = 1;
5384 	s->repo = repo;
5385 	s->id1 = id1;
5386 	s->id2 = id2;
5387 	s->label1 = label1;
5388 	s->label2 = label2;
5389 
5390 	if (id1) {
5391 		s->id1 = got_object_id_dup(id1);
5392 		if (s->id1 == NULL) {
5393 			err = got_error_from_errno("got_object_id_dup");
5394 			goto done;
5395 		}
5396 	} else
5397 		s->id1 = NULL;
5398 
5399 	s->id2 = got_object_id_dup(id2);
5400 	if (s->id2 == NULL) {
5401 		err = got_error_from_errno("got_object_id_dup");
5402 		goto done;
5403 	}
5404 
5405 	s->f1 = got_opentemp();
5406 	if (s->f1 == NULL) {
5407 		err = got_error_from_errno("got_opentemp");
5408 		goto done;
5409 	}
5410 
5411 	s->f2 = got_opentemp();
5412 	if (s->f2 == NULL) {
5413 		err = got_error_from_errno("got_opentemp");
5414 		goto done;
5415 	}
5416 
5417 	s->fd1 = got_opentempfd();
5418 	if (s->fd1 == -1) {
5419 		err = got_error_from_errno("got_opentempfd");
5420 		goto done;
5421 	}
5422 
5423 	s->fd2 = got_opentempfd();
5424 	if (s->fd2 == -1) {
5425 		err = got_error_from_errno("got_opentempfd");
5426 		goto done;
5427 	}
5428 
5429 	s->diff_context = diff_context;
5430 	s->ignore_whitespace = ignore_whitespace;
5431 	s->force_text_diff = force_text_diff;
5432 	s->parent_view = parent_view;
5433 	s->repo = repo;
5434 
5435 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5436 		int rc;
5437 
5438 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5439 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5440 		if (rc != ERR)
5441 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5442 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5443 		if (rc != ERR)
5444 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5445 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5446 		if (rc != ERR)
5447 			rc = init_pair(GOT_DIFF_LINE_META,
5448 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5449 		if (rc != ERR)
5450 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5451 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5452 		if (rc != ERR)
5453 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5454 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5455 		if (rc != ERR)
5456 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5457 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5458 		if (rc != ERR)
5459 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5460 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5461 		if (rc != ERR)
5462 			rc = init_pair(GOT_DIFF_LINE_DATE,
5463 			    get_color_value("TOG_COLOR_DATE"), -1);
5464 		if (rc == ERR) {
5465 			err = got_error(GOT_ERR_RANGE);
5466 			goto done;
5467 		}
5468 	}
5469 
5470 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5471 	    view_is_splitscreen(view))
5472 		show_log_view(parent_view); /* draw border */
5473 	diff_view_indicate_progress(view);
5474 
5475 	err = create_diff(s);
5476 
5477 	view->show = show_diff_view;
5478 	view->input = input_diff_view;
5479 	view->reset = reset_diff_view;
5480 	view->close = close_diff_view;
5481 	view->search_start = search_start_diff_view;
5482 	view->search_setup = search_setup_diff_view;
5483 	view->search_next = search_next_view_match;
5484 done:
5485 	if (err) {
5486 		if (view->close == NULL)
5487 			close_diff_view(view);
5488 		view_close(view);
5489 	}
5490 	return err;
5491 }
5492 
5493 static const struct got_error *
5494 show_diff_view(struct tog_view *view)
5495 {
5496 	const struct got_error *err;
5497 	struct tog_diff_view_state *s = &view->state.diff;
5498 	char *id_str1 = NULL, *id_str2, *header;
5499 	const char *label1, *label2;
5500 
5501 	if (s->id1) {
5502 		err = got_object_id_str(&id_str1, s->id1);
5503 		if (err)
5504 			return err;
5505 		label1 = s->label1 ? s->label1 : id_str1;
5506 	} else
5507 		label1 = "/dev/null";
5508 
5509 	err = got_object_id_str(&id_str2, s->id2);
5510 	if (err)
5511 		return err;
5512 	label2 = s->label2 ? s->label2 : id_str2;
5513 
5514 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5515 		err = got_error_from_errno("asprintf");
5516 		free(id_str1);
5517 		free(id_str2);
5518 		return err;
5519 	}
5520 	free(id_str1);
5521 	free(id_str2);
5522 
5523 	err = draw_file(view, header);
5524 	free(header);
5525 	return err;
5526 }
5527 
5528 static const struct got_error *
5529 set_selected_commit(struct tog_diff_view_state *s,
5530     struct commit_queue_entry *entry)
5531 {
5532 	const struct got_error *err;
5533 	const struct got_object_id_queue *parent_ids;
5534 	struct got_commit_object *selected_commit;
5535 	struct got_object_qid *pid;
5536 
5537 	free(s->id2);
5538 	s->id2 = got_object_id_dup(entry->id);
5539 	if (s->id2 == NULL)
5540 		return got_error_from_errno("got_object_id_dup");
5541 
5542 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5543 	if (err)
5544 		return err;
5545 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5546 	free(s->id1);
5547 	pid = STAILQ_FIRST(parent_ids);
5548 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5549 	got_object_commit_close(selected_commit);
5550 	return NULL;
5551 }
5552 
5553 static const struct got_error *
5554 reset_diff_view(struct tog_view *view)
5555 {
5556 	struct tog_diff_view_state *s = &view->state.diff;
5557 
5558 	view->count = 0;
5559 	wclear(view->window);
5560 	s->first_displayed_line = 1;
5561 	s->last_displayed_line = view->nlines;
5562 	s->matched_line = 0;
5563 	diff_view_indicate_progress(view);
5564 	return create_diff(s);
5565 }
5566 
5567 static void
5568 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5569 {
5570 	int start, i;
5571 
5572 	i = start = s->first_displayed_line - 1;
5573 
5574 	while (s->lines[i].type != type) {
5575 		if (i == 0)
5576 			i = s->nlines - 1;
5577 		if (--i == start)
5578 			return; /* do nothing, requested type not in file */
5579 	}
5580 
5581 	s->selected_line = 1;
5582 	s->first_displayed_line = i;
5583 }
5584 
5585 static void
5586 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5587 {
5588 	int start, i;
5589 
5590 	i = start = s->first_displayed_line + 1;
5591 
5592 	while (s->lines[i].type != type) {
5593 		if (i == s->nlines - 1)
5594 			i = 0;
5595 		if (++i == start)
5596 			return; /* do nothing, requested type not in file */
5597 	}
5598 
5599 	s->selected_line = 1;
5600 	s->first_displayed_line = i;
5601 }
5602 
5603 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5604     int, int, int);
5605 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5606     int, int);
5607 
5608 static const struct got_error *
5609 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5610 {
5611 	const struct got_error *err = NULL;
5612 	struct tog_diff_view_state *s = &view->state.diff;
5613 	struct tog_log_view_state *ls;
5614 	struct commit_queue_entry *old_selected_entry;
5615 	char *line = NULL;
5616 	size_t linesize = 0;
5617 	ssize_t linelen;
5618 	int i, nscroll = view->nlines - 1, up = 0;
5619 
5620 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5621 
5622 	switch (ch) {
5623 	case '0':
5624 	case '$':
5625 	case KEY_RIGHT:
5626 	case 'l':
5627 	case KEY_LEFT:
5628 	case 'h':
5629 		horizontal_scroll_input(view, ch);
5630 		break;
5631 	case 'a':
5632 	case 'w':
5633 		if (ch == 'a') {
5634 			s->force_text_diff = !s->force_text_diff;
5635 			view->action = s->force_text_diff ?
5636 			    "force ASCII text enabled" :
5637 			    "force ASCII text disabled";
5638 		}
5639 		else if (ch == 'w') {
5640 			s->ignore_whitespace = !s->ignore_whitespace;
5641 			view->action = s->ignore_whitespace ?
5642 			    "ignore whitespace enabled" :
5643 			    "ignore whitespace disabled";
5644 		}
5645 		err = reset_diff_view(view);
5646 		break;
5647 	case 'g':
5648 	case KEY_HOME:
5649 		s->first_displayed_line = 1;
5650 		view->count = 0;
5651 		break;
5652 	case 'G':
5653 	case KEY_END:
5654 		view->count = 0;
5655 		if (s->eof)
5656 			break;
5657 
5658 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5659 		s->eof = 1;
5660 		break;
5661 	case 'k':
5662 	case KEY_UP:
5663 	case CTRL('p'):
5664 		if (s->first_displayed_line > 1)
5665 			s->first_displayed_line--;
5666 		else
5667 			view->count = 0;
5668 		break;
5669 	case CTRL('u'):
5670 	case 'u':
5671 		nscroll /= 2;
5672 		/* FALL THROUGH */
5673 	case KEY_PPAGE:
5674 	case CTRL('b'):
5675 	case 'b':
5676 		if (s->first_displayed_line == 1) {
5677 			view->count = 0;
5678 			break;
5679 		}
5680 		i = 0;
5681 		while (i++ < nscroll && s->first_displayed_line > 1)
5682 			s->first_displayed_line--;
5683 		break;
5684 	case 'j':
5685 	case KEY_DOWN:
5686 	case CTRL('n'):
5687 		if (!s->eof)
5688 			s->first_displayed_line++;
5689 		else
5690 			view->count = 0;
5691 		break;
5692 	case CTRL('d'):
5693 	case 'd':
5694 		nscroll /= 2;
5695 		/* FALL THROUGH */
5696 	case KEY_NPAGE:
5697 	case CTRL('f'):
5698 	case 'f':
5699 	case ' ':
5700 		if (s->eof) {
5701 			view->count = 0;
5702 			break;
5703 		}
5704 		i = 0;
5705 		while (!s->eof && i++ < nscroll) {
5706 			linelen = getline(&line, &linesize, s->f);
5707 			s->first_displayed_line++;
5708 			if (linelen == -1) {
5709 				if (feof(s->f)) {
5710 					s->eof = 1;
5711 				} else
5712 					err = got_ferror(s->f, GOT_ERR_IO);
5713 				break;
5714 			}
5715 		}
5716 		free(line);
5717 		break;
5718 	case '(':
5719 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5720 		break;
5721 	case ')':
5722 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5723 		break;
5724 	case '{':
5725 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5726 		break;
5727 	case '}':
5728 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5729 		break;
5730 	case '[':
5731 		if (s->diff_context > 0) {
5732 			s->diff_context--;
5733 			s->matched_line = 0;
5734 			diff_view_indicate_progress(view);
5735 			err = create_diff(s);
5736 			if (s->first_displayed_line + view->nlines - 1 >
5737 			    s->nlines) {
5738 				s->first_displayed_line = 1;
5739 				s->last_displayed_line = view->nlines;
5740 			}
5741 		} else
5742 			view->count = 0;
5743 		break;
5744 	case ']':
5745 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5746 			s->diff_context++;
5747 			s->matched_line = 0;
5748 			diff_view_indicate_progress(view);
5749 			err = create_diff(s);
5750 		} else
5751 			view->count = 0;
5752 		break;
5753 	case '<':
5754 	case ',':
5755 	case 'K':
5756 		up = 1;
5757 		/* FALL THROUGH */
5758 	case '>':
5759 	case '.':
5760 	case 'J':
5761 		if (s->parent_view == NULL) {
5762 			view->count = 0;
5763 			break;
5764 		}
5765 		s->parent_view->count = view->count;
5766 
5767 		if (s->parent_view->type == TOG_VIEW_LOG) {
5768 			ls = &s->parent_view->state.log;
5769 			old_selected_entry = ls->selected_entry;
5770 
5771 			err = input_log_view(NULL, s->parent_view,
5772 			    up ? KEY_UP : KEY_DOWN);
5773 			if (err)
5774 				break;
5775 			view->count = s->parent_view->count;
5776 
5777 			if (old_selected_entry == ls->selected_entry)
5778 				break;
5779 
5780 			err = set_selected_commit(s, ls->selected_entry);
5781 			if (err)
5782 				break;
5783 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5784 			struct tog_blame_view_state *bs;
5785 			struct got_object_id *id, *prev_id;
5786 
5787 			bs = &s->parent_view->state.blame;
5788 			prev_id = get_annotation_for_line(bs->blame.lines,
5789 			    bs->blame.nlines, bs->last_diffed_line);
5790 
5791 			err = input_blame_view(&view, s->parent_view,
5792 			    up ? KEY_UP : KEY_DOWN);
5793 			if (err)
5794 				break;
5795 			view->count = s->parent_view->count;
5796 
5797 			if (prev_id == NULL)
5798 				break;
5799 			id = get_selected_commit_id(bs->blame.lines,
5800 			    bs->blame.nlines, bs->first_displayed_line,
5801 			    bs->selected_line);
5802 			if (id == NULL)
5803 				break;
5804 
5805 			if (!got_object_id_cmp(prev_id, id))
5806 				break;
5807 
5808 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5809 			if (err)
5810 				break;
5811 		}
5812 		s->first_displayed_line = 1;
5813 		s->last_displayed_line = view->nlines;
5814 		s->matched_line = 0;
5815 		view->x = 0;
5816 
5817 		diff_view_indicate_progress(view);
5818 		err = create_diff(s);
5819 		break;
5820 	default:
5821 		view->count = 0;
5822 		break;
5823 	}
5824 
5825 	return err;
5826 }
5827 
5828 static const struct got_error *
5829 cmd_diff(int argc, char *argv[])
5830 {
5831 	const struct got_error *error;
5832 	struct got_repository *repo = NULL;
5833 	struct got_worktree *worktree = NULL;
5834 	struct got_object_id *id1 = NULL, *id2 = NULL;
5835 	char *repo_path = NULL, *cwd = NULL;
5836 	char *id_str1 = NULL, *id_str2 = NULL;
5837 	char *label1 = NULL, *label2 = NULL;
5838 	int diff_context = 3, ignore_whitespace = 0;
5839 	int ch, force_text_diff = 0;
5840 	const char *errstr;
5841 	struct tog_view *view;
5842 	int *pack_fds = NULL;
5843 
5844 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5845 		switch (ch) {
5846 		case 'a':
5847 			force_text_diff = 1;
5848 			break;
5849 		case 'C':
5850 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5851 			    &errstr);
5852 			if (errstr != NULL)
5853 				errx(1, "number of context lines is %s: %s",
5854 				    errstr, errstr);
5855 			break;
5856 		case 'r':
5857 			repo_path = realpath(optarg, NULL);
5858 			if (repo_path == NULL)
5859 				return got_error_from_errno2("realpath",
5860 				    optarg);
5861 			got_path_strip_trailing_slashes(repo_path);
5862 			break;
5863 		case 'w':
5864 			ignore_whitespace = 1;
5865 			break;
5866 		default:
5867 			usage_diff();
5868 			/* NOTREACHED */
5869 		}
5870 	}
5871 
5872 	argc -= optind;
5873 	argv += optind;
5874 
5875 	if (argc == 0) {
5876 		usage_diff(); /* TODO show local worktree changes */
5877 	} else if (argc == 2) {
5878 		id_str1 = argv[0];
5879 		id_str2 = argv[1];
5880 	} else
5881 		usage_diff();
5882 
5883 	error = got_repo_pack_fds_open(&pack_fds);
5884 	if (error)
5885 		goto done;
5886 
5887 	if (repo_path == NULL) {
5888 		cwd = getcwd(NULL, 0);
5889 		if (cwd == NULL)
5890 			return got_error_from_errno("getcwd");
5891 		error = got_worktree_open(&worktree, cwd);
5892 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5893 			goto done;
5894 		if (worktree)
5895 			repo_path =
5896 			    strdup(got_worktree_get_repo_path(worktree));
5897 		else
5898 			repo_path = strdup(cwd);
5899 		if (repo_path == NULL) {
5900 			error = got_error_from_errno("strdup");
5901 			goto done;
5902 		}
5903 	}
5904 
5905 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5906 	if (error)
5907 		goto done;
5908 
5909 	init_curses();
5910 
5911 	error = apply_unveil(got_repo_get_path(repo), NULL);
5912 	if (error)
5913 		goto done;
5914 
5915 	error = tog_load_refs(repo, 0);
5916 	if (error)
5917 		goto done;
5918 
5919 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5920 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5921 	if (error)
5922 		goto done;
5923 
5924 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5925 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5926 	if (error)
5927 		goto done;
5928 
5929 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5930 	if (view == NULL) {
5931 		error = got_error_from_errno("view_open");
5932 		goto done;
5933 	}
5934 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5935 	    ignore_whitespace, force_text_diff, NULL,  repo);
5936 	if (error)
5937 		goto done;
5938 	error = view_loop(view);
5939 done:
5940 	free(label1);
5941 	free(label2);
5942 	free(repo_path);
5943 	free(cwd);
5944 	if (repo) {
5945 		const struct got_error *close_err = got_repo_close(repo);
5946 		if (error == NULL)
5947 			error = close_err;
5948 	}
5949 	if (worktree)
5950 		got_worktree_close(worktree);
5951 	if (pack_fds) {
5952 		const struct got_error *pack_err =
5953 		    got_repo_pack_fds_close(pack_fds);
5954 		if (error == NULL)
5955 			error = pack_err;
5956 	}
5957 	tog_free_refs();
5958 	return error;
5959 }
5960 
5961 __dead static void
5962 usage_blame(void)
5963 {
5964 	endwin();
5965 	fprintf(stderr,
5966 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5967 	    getprogname());
5968 	exit(1);
5969 }
5970 
5971 struct tog_blame_line {
5972 	int annotated;
5973 	struct got_object_id *id;
5974 };
5975 
5976 static const struct got_error *
5977 draw_blame(struct tog_view *view)
5978 {
5979 	struct tog_blame_view_state *s = &view->state.blame;
5980 	struct tog_blame *blame = &s->blame;
5981 	regmatch_t *regmatch = &view->regmatch;
5982 	const struct got_error *err;
5983 	int lineno = 0, nprinted = 0;
5984 	char *line = NULL;
5985 	size_t linesize = 0;
5986 	ssize_t linelen;
5987 	wchar_t *wline;
5988 	int width;
5989 	struct tog_blame_line *blame_line;
5990 	struct got_object_id *prev_id = NULL;
5991 	char *id_str;
5992 	struct tog_color *tc;
5993 
5994 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5995 	if (err)
5996 		return err;
5997 
5998 	rewind(blame->f);
5999 	werase(view->window);
6000 
6001 	if (asprintf(&line, "commit %s", id_str) == -1) {
6002 		err = got_error_from_errno("asprintf");
6003 		free(id_str);
6004 		return err;
6005 	}
6006 
6007 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6008 	free(line);
6009 	line = NULL;
6010 	if (err)
6011 		return err;
6012 	if (view_needs_focus_indication(view))
6013 		wstandout(view->window);
6014 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6015 	if (tc)
6016 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6017 	waddwstr(view->window, wline);
6018 	while (width++ < view->ncols)
6019 		waddch(view->window, ' ');
6020 	if (tc)
6021 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6022 	if (view_needs_focus_indication(view))
6023 		wstandend(view->window);
6024 	free(wline);
6025 	wline = NULL;
6026 
6027 	if (view->gline > blame->nlines)
6028 		view->gline = blame->nlines;
6029 
6030 	if (tog_io.wait_for_ui) {
6031 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6032 		int rc;
6033 
6034 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6035 		if (rc)
6036 			return got_error_set_errno(rc, "pthread_cond_wait");
6037 		tog_io.wait_for_ui = 0;
6038 	}
6039 
6040 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6041 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6042 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6043 		free(id_str);
6044 		return got_error_from_errno("asprintf");
6045 	}
6046 	free(id_str);
6047 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6048 	free(line);
6049 	line = NULL;
6050 	if (err)
6051 		return err;
6052 	waddwstr(view->window, wline);
6053 	free(wline);
6054 	wline = NULL;
6055 	if (width < view->ncols - 1)
6056 		waddch(view->window, '\n');
6057 
6058 	s->eof = 0;
6059 	view->maxx = 0;
6060 	while (nprinted < view->nlines - 2) {
6061 		linelen = getline(&line, &linesize, blame->f);
6062 		if (linelen == -1) {
6063 			if (feof(blame->f)) {
6064 				s->eof = 1;
6065 				break;
6066 			}
6067 			free(line);
6068 			return got_ferror(blame->f, GOT_ERR_IO);
6069 		}
6070 		if (++lineno < s->first_displayed_line)
6071 			continue;
6072 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6073 			continue;
6074 
6075 		/* Set view->maxx based on full line length. */
6076 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6077 		if (err) {
6078 			free(line);
6079 			return err;
6080 		}
6081 		free(wline);
6082 		wline = NULL;
6083 		view->maxx = MAX(view->maxx, width);
6084 
6085 		if (nprinted == s->selected_line - 1)
6086 			wstandout(view->window);
6087 
6088 		if (blame->nlines > 0) {
6089 			blame_line = &blame->lines[lineno - 1];
6090 			if (blame_line->annotated && prev_id &&
6091 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6092 			    !(nprinted == s->selected_line - 1)) {
6093 				waddstr(view->window, "        ");
6094 			} else if (blame_line->annotated) {
6095 				char *id_str;
6096 				err = got_object_id_str(&id_str,
6097 				    blame_line->id);
6098 				if (err) {
6099 					free(line);
6100 					return err;
6101 				}
6102 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6103 				if (tc)
6104 					wattr_on(view->window,
6105 					    COLOR_PAIR(tc->colorpair), NULL);
6106 				wprintw(view->window, "%.8s", id_str);
6107 				if (tc)
6108 					wattr_off(view->window,
6109 					    COLOR_PAIR(tc->colorpair), NULL);
6110 				free(id_str);
6111 				prev_id = blame_line->id;
6112 			} else {
6113 				waddstr(view->window, "........");
6114 				prev_id = NULL;
6115 			}
6116 		} else {
6117 			waddstr(view->window, "........");
6118 			prev_id = NULL;
6119 		}
6120 
6121 		if (nprinted == s->selected_line - 1)
6122 			wstandend(view->window);
6123 		waddstr(view->window, " ");
6124 
6125 		if (view->ncols <= 9) {
6126 			width = 9;
6127 		} else if (s->first_displayed_line + nprinted ==
6128 		    s->matched_line &&
6129 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6130 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6131 			    view->window, view->x, regmatch);
6132 			if (err) {
6133 				free(line);
6134 				return err;
6135 			}
6136 			width += 9;
6137 		} else {
6138 			int skip;
6139 			err = format_line(&wline, &width, &skip, line,
6140 			    view->x, view->ncols - 9, 9, 1);
6141 			if (err) {
6142 				free(line);
6143 				return err;
6144 			}
6145 			waddwstr(view->window, &wline[skip]);
6146 			width += 9;
6147 			free(wline);
6148 			wline = NULL;
6149 		}
6150 
6151 		if (width <= view->ncols - 1)
6152 			waddch(view->window, '\n');
6153 		if (++nprinted == 1)
6154 			s->first_displayed_line = lineno;
6155 	}
6156 	free(line);
6157 	s->last_displayed_line = lineno;
6158 
6159 	view_border(view);
6160 
6161 	return NULL;
6162 }
6163 
6164 static const struct got_error *
6165 blame_cb(void *arg, int nlines, int lineno,
6166     struct got_commit_object *commit, struct got_object_id *id)
6167 {
6168 	const struct got_error *err = NULL;
6169 	struct tog_blame_cb_args *a = arg;
6170 	struct tog_blame_line *line;
6171 	int errcode;
6172 
6173 	if (nlines != a->nlines ||
6174 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6175 		return got_error(GOT_ERR_RANGE);
6176 
6177 	errcode = pthread_mutex_lock(&tog_mutex);
6178 	if (errcode)
6179 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6180 
6181 	if (*a->quit) {	/* user has quit the blame view */
6182 		err = got_error(GOT_ERR_ITER_COMPLETED);
6183 		goto done;
6184 	}
6185 
6186 	if (lineno == -1)
6187 		goto done; /* no change in this commit */
6188 
6189 	line = &a->lines[lineno - 1];
6190 	if (line->annotated)
6191 		goto done;
6192 
6193 	line->id = got_object_id_dup(id);
6194 	if (line->id == NULL) {
6195 		err = got_error_from_errno("got_object_id_dup");
6196 		goto done;
6197 	}
6198 	line->annotated = 1;
6199 done:
6200 	errcode = pthread_mutex_unlock(&tog_mutex);
6201 	if (errcode)
6202 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6203 	return err;
6204 }
6205 
6206 static void *
6207 blame_thread(void *arg)
6208 {
6209 	const struct got_error *err, *close_err;
6210 	struct tog_blame_thread_args *ta = arg;
6211 	struct tog_blame_cb_args *a = ta->cb_args;
6212 	int errcode, fd1 = -1, fd2 = -1;
6213 	FILE *f1 = NULL, *f2 = NULL;
6214 
6215 	fd1 = got_opentempfd();
6216 	if (fd1 == -1)
6217 		return (void *)got_error_from_errno("got_opentempfd");
6218 
6219 	fd2 = got_opentempfd();
6220 	if (fd2 == -1) {
6221 		err = got_error_from_errno("got_opentempfd");
6222 		goto done;
6223 	}
6224 
6225 	f1 = got_opentemp();
6226 	if (f1 == NULL) {
6227 		err = (void *)got_error_from_errno("got_opentemp");
6228 		goto done;
6229 	}
6230 	f2 = got_opentemp();
6231 	if (f2 == NULL) {
6232 		err = (void *)got_error_from_errno("got_opentemp");
6233 		goto done;
6234 	}
6235 
6236 	err = block_signals_used_by_main_thread();
6237 	if (err)
6238 		goto done;
6239 
6240 	err = got_blame(ta->path, a->commit_id, ta->repo,
6241 	    tog_diff_algo, blame_cb, ta->cb_args,
6242 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6243 	if (err && err->code == GOT_ERR_CANCELLED)
6244 		err = NULL;
6245 
6246 	errcode = pthread_mutex_lock(&tog_mutex);
6247 	if (errcode) {
6248 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6249 		goto done;
6250 	}
6251 
6252 	close_err = got_repo_close(ta->repo);
6253 	if (err == NULL)
6254 		err = close_err;
6255 	ta->repo = NULL;
6256 	*ta->complete = 1;
6257 
6258 	if (tog_io.wait_for_ui) {
6259 		errcode = pthread_cond_signal(&ta->blame_complete);
6260 		if (errcode && err == NULL)
6261 			err = got_error_set_errno(errcode,
6262 			    "pthread_cond_signal");
6263 	}
6264 
6265 	errcode = pthread_mutex_unlock(&tog_mutex);
6266 	if (errcode && err == NULL)
6267 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6268 
6269 done:
6270 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6271 		err = got_error_from_errno("close");
6272 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6273 		err = got_error_from_errno("close");
6274 	if (f1 && fclose(f1) == EOF && err == NULL)
6275 		err = got_error_from_errno("fclose");
6276 	if (f2 && fclose(f2) == EOF && err == NULL)
6277 		err = got_error_from_errno("fclose");
6278 
6279 	return (void *)err;
6280 }
6281 
6282 static struct got_object_id *
6283 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6284     int first_displayed_line, int selected_line)
6285 {
6286 	struct tog_blame_line *line;
6287 
6288 	if (nlines <= 0)
6289 		return NULL;
6290 
6291 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6292 	if (!line->annotated)
6293 		return NULL;
6294 
6295 	return line->id;
6296 }
6297 
6298 static struct got_object_id *
6299 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6300     int lineno)
6301 {
6302 	struct tog_blame_line *line;
6303 
6304 	if (nlines <= 0 || lineno >= nlines)
6305 		return NULL;
6306 
6307 	line = &lines[lineno - 1];
6308 	if (!line->annotated)
6309 		return NULL;
6310 
6311 	return line->id;
6312 }
6313 
6314 static const struct got_error *
6315 stop_blame(struct tog_blame *blame)
6316 {
6317 	const struct got_error *err = NULL;
6318 	int i;
6319 
6320 	if (blame->thread) {
6321 		int errcode;
6322 		errcode = pthread_mutex_unlock(&tog_mutex);
6323 		if (errcode)
6324 			return got_error_set_errno(errcode,
6325 			    "pthread_mutex_unlock");
6326 		errcode = pthread_join(blame->thread, (void **)&err);
6327 		if (errcode)
6328 			return got_error_set_errno(errcode, "pthread_join");
6329 		errcode = pthread_mutex_lock(&tog_mutex);
6330 		if (errcode)
6331 			return got_error_set_errno(errcode,
6332 			    "pthread_mutex_lock");
6333 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6334 			err = NULL;
6335 		blame->thread = 0; //NULL;
6336 	}
6337 	if (blame->thread_args.repo) {
6338 		const struct got_error *close_err;
6339 		close_err = got_repo_close(blame->thread_args.repo);
6340 		if (err == NULL)
6341 			err = close_err;
6342 		blame->thread_args.repo = NULL;
6343 	}
6344 	if (blame->f) {
6345 		if (fclose(blame->f) == EOF && err == NULL)
6346 			err = got_error_from_errno("fclose");
6347 		blame->f = NULL;
6348 	}
6349 	if (blame->lines) {
6350 		for (i = 0; i < blame->nlines; i++)
6351 			free(blame->lines[i].id);
6352 		free(blame->lines);
6353 		blame->lines = NULL;
6354 	}
6355 	free(blame->cb_args.commit_id);
6356 	blame->cb_args.commit_id = NULL;
6357 	if (blame->pack_fds) {
6358 		const struct got_error *pack_err =
6359 		    got_repo_pack_fds_close(blame->pack_fds);
6360 		if (err == NULL)
6361 			err = pack_err;
6362 		blame->pack_fds = NULL;
6363 	}
6364 	return err;
6365 }
6366 
6367 static const struct got_error *
6368 cancel_blame_view(void *arg)
6369 {
6370 	const struct got_error *err = NULL;
6371 	int *done = arg;
6372 	int errcode;
6373 
6374 	errcode = pthread_mutex_lock(&tog_mutex);
6375 	if (errcode)
6376 		return got_error_set_errno(errcode,
6377 		    "pthread_mutex_unlock");
6378 
6379 	if (*done)
6380 		err = got_error(GOT_ERR_CANCELLED);
6381 
6382 	errcode = pthread_mutex_unlock(&tog_mutex);
6383 	if (errcode)
6384 		return got_error_set_errno(errcode,
6385 		    "pthread_mutex_lock");
6386 
6387 	return err;
6388 }
6389 
6390 static const struct got_error *
6391 run_blame(struct tog_view *view)
6392 {
6393 	struct tog_blame_view_state *s = &view->state.blame;
6394 	struct tog_blame *blame = &s->blame;
6395 	const struct got_error *err = NULL;
6396 	struct got_commit_object *commit = NULL;
6397 	struct got_blob_object *blob = NULL;
6398 	struct got_repository *thread_repo = NULL;
6399 	struct got_object_id *obj_id = NULL;
6400 	int obj_type, fd = -1;
6401 	int *pack_fds = NULL;
6402 
6403 	err = got_object_open_as_commit(&commit, s->repo,
6404 	    &s->blamed_commit->id);
6405 	if (err)
6406 		return err;
6407 
6408 	fd = got_opentempfd();
6409 	if (fd == -1) {
6410 		err = got_error_from_errno("got_opentempfd");
6411 		goto done;
6412 	}
6413 
6414 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6415 	if (err)
6416 		goto done;
6417 
6418 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6419 	if (err)
6420 		goto done;
6421 
6422 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6423 		err = got_error(GOT_ERR_OBJ_TYPE);
6424 		goto done;
6425 	}
6426 
6427 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6428 	if (err)
6429 		goto done;
6430 	blame->f = got_opentemp();
6431 	if (blame->f == NULL) {
6432 		err = got_error_from_errno("got_opentemp");
6433 		goto done;
6434 	}
6435 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6436 	    &blame->line_offsets, blame->f, blob);
6437 	if (err)
6438 		goto done;
6439 	if (blame->nlines == 0) {
6440 		s->blame_complete = 1;
6441 		goto done;
6442 	}
6443 
6444 	/* Don't include \n at EOF in the blame line count. */
6445 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6446 		blame->nlines--;
6447 
6448 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6449 	if (blame->lines == NULL) {
6450 		err = got_error_from_errno("calloc");
6451 		goto done;
6452 	}
6453 
6454 	err = got_repo_pack_fds_open(&pack_fds);
6455 	if (err)
6456 		goto done;
6457 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6458 	    pack_fds);
6459 	if (err)
6460 		goto done;
6461 
6462 	blame->pack_fds = pack_fds;
6463 	blame->cb_args.view = view;
6464 	blame->cb_args.lines = blame->lines;
6465 	blame->cb_args.nlines = blame->nlines;
6466 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6467 	if (blame->cb_args.commit_id == NULL) {
6468 		err = got_error_from_errno("got_object_id_dup");
6469 		goto done;
6470 	}
6471 	blame->cb_args.quit = &s->done;
6472 
6473 	blame->thread_args.path = s->path;
6474 	blame->thread_args.repo = thread_repo;
6475 	blame->thread_args.cb_args = &blame->cb_args;
6476 	blame->thread_args.complete = &s->blame_complete;
6477 	blame->thread_args.cancel_cb = cancel_blame_view;
6478 	blame->thread_args.cancel_arg = &s->done;
6479 	s->blame_complete = 0;
6480 
6481 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6482 		s->first_displayed_line = 1;
6483 		s->last_displayed_line = view->nlines;
6484 		s->selected_line = 1;
6485 	}
6486 	s->matched_line = 0;
6487 
6488 done:
6489 	if (commit)
6490 		got_object_commit_close(commit);
6491 	if (fd != -1 && close(fd) == -1 && err == NULL)
6492 		err = got_error_from_errno("close");
6493 	if (blob)
6494 		got_object_blob_close(blob);
6495 	free(obj_id);
6496 	if (err)
6497 		stop_blame(blame);
6498 	return err;
6499 }
6500 
6501 static const struct got_error *
6502 open_blame_view(struct tog_view *view, char *path,
6503     struct got_object_id *commit_id, struct got_repository *repo)
6504 {
6505 	const struct got_error *err = NULL;
6506 	struct tog_blame_view_state *s = &view->state.blame;
6507 
6508 	STAILQ_INIT(&s->blamed_commits);
6509 
6510 	s->path = strdup(path);
6511 	if (s->path == NULL)
6512 		return got_error_from_errno("strdup");
6513 
6514 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6515 	if (err) {
6516 		free(s->path);
6517 		return err;
6518 	}
6519 
6520 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6521 	s->first_displayed_line = 1;
6522 	s->last_displayed_line = view->nlines;
6523 	s->selected_line = 1;
6524 	s->blame_complete = 0;
6525 	s->repo = repo;
6526 	s->commit_id = commit_id;
6527 	memset(&s->blame, 0, sizeof(s->blame));
6528 
6529 	STAILQ_INIT(&s->colors);
6530 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6531 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6532 		    get_color_value("TOG_COLOR_COMMIT"));
6533 		if (err)
6534 			return err;
6535 	}
6536 
6537 	view->show = show_blame_view;
6538 	view->input = input_blame_view;
6539 	view->reset = reset_blame_view;
6540 	view->close = close_blame_view;
6541 	view->search_start = search_start_blame_view;
6542 	view->search_setup = search_setup_blame_view;
6543 	view->search_next = search_next_view_match;
6544 
6545 	if (using_mock_io) {
6546 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6547 		int rc;
6548 
6549 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6550 		if (rc)
6551 			return got_error_set_errno(rc, "pthread_cond_init");
6552 	}
6553 
6554 	return run_blame(view);
6555 }
6556 
6557 static const struct got_error *
6558 close_blame_view(struct tog_view *view)
6559 {
6560 	const struct got_error *err = NULL;
6561 	struct tog_blame_view_state *s = &view->state.blame;
6562 
6563 	if (s->blame.thread)
6564 		err = stop_blame(&s->blame);
6565 
6566 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6567 		struct got_object_qid *blamed_commit;
6568 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6569 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6570 		got_object_qid_free(blamed_commit);
6571 	}
6572 
6573 	if (using_mock_io) {
6574 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6575 		int rc;
6576 
6577 		rc = pthread_cond_destroy(&bta->blame_complete);
6578 		if (rc && err == NULL)
6579 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6580 	}
6581 
6582 	free(s->path);
6583 	free_colors(&s->colors);
6584 	return err;
6585 }
6586 
6587 static const struct got_error *
6588 search_start_blame_view(struct tog_view *view)
6589 {
6590 	struct tog_blame_view_state *s = &view->state.blame;
6591 
6592 	s->matched_line = 0;
6593 	return NULL;
6594 }
6595 
6596 static void
6597 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6598     size_t *nlines, int **first, int **last, int **match, int **selected)
6599 {
6600 	struct tog_blame_view_state *s = &view->state.blame;
6601 
6602 	*f = s->blame.f;
6603 	*nlines = s->blame.nlines;
6604 	*line_offsets = s->blame.line_offsets;
6605 	*match = &s->matched_line;
6606 	*first = &s->first_displayed_line;
6607 	*last = &s->last_displayed_line;
6608 	*selected = &s->selected_line;
6609 }
6610 
6611 static const struct got_error *
6612 show_blame_view(struct tog_view *view)
6613 {
6614 	const struct got_error *err = NULL;
6615 	struct tog_blame_view_state *s = &view->state.blame;
6616 	int errcode;
6617 
6618 	if (s->blame.thread == 0 && !s->blame_complete) {
6619 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6620 		    &s->blame.thread_args);
6621 		if (errcode)
6622 			return got_error_set_errno(errcode, "pthread_create");
6623 
6624 		if (!using_mock_io)
6625 			halfdelay(1); /* fast refresh while annotating  */
6626 	}
6627 
6628 	if (s->blame_complete && !using_mock_io)
6629 		halfdelay(10); /* disable fast refresh */
6630 
6631 	err = draw_blame(view);
6632 
6633 	view_border(view);
6634 	return err;
6635 }
6636 
6637 static const struct got_error *
6638 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6639     struct got_repository *repo, struct got_object_id *id)
6640 {
6641 	struct tog_view		*log_view;
6642 	const struct got_error	*err = NULL;
6643 
6644 	*new_view = NULL;
6645 
6646 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6647 	if (log_view == NULL)
6648 		return got_error_from_errno("view_open");
6649 
6650 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6651 	if (err)
6652 		view_close(log_view);
6653 	else
6654 		*new_view = log_view;
6655 
6656 	return err;
6657 }
6658 
6659 static const struct got_error *
6660 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6661 {
6662 	const struct got_error *err = NULL, *thread_err = NULL;
6663 	struct tog_view *diff_view;
6664 	struct tog_blame_view_state *s = &view->state.blame;
6665 	int eos, nscroll, begin_y = 0, begin_x = 0;
6666 
6667 	eos = nscroll = view->nlines - 2;
6668 	if (view_is_hsplit_top(view))
6669 		--eos;  /* border */
6670 
6671 	switch (ch) {
6672 	case '0':
6673 	case '$':
6674 	case KEY_RIGHT:
6675 	case 'l':
6676 	case KEY_LEFT:
6677 	case 'h':
6678 		horizontal_scroll_input(view, ch);
6679 		break;
6680 	case 'q':
6681 		s->done = 1;
6682 		break;
6683 	case 'g':
6684 	case KEY_HOME:
6685 		s->selected_line = 1;
6686 		s->first_displayed_line = 1;
6687 		view->count = 0;
6688 		break;
6689 	case 'G':
6690 	case KEY_END:
6691 		if (s->blame.nlines < eos) {
6692 			s->selected_line = s->blame.nlines;
6693 			s->first_displayed_line = 1;
6694 		} else {
6695 			s->selected_line = eos;
6696 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6697 		}
6698 		view->count = 0;
6699 		break;
6700 	case 'k':
6701 	case KEY_UP:
6702 	case CTRL('p'):
6703 		if (s->selected_line > 1)
6704 			s->selected_line--;
6705 		else if (s->selected_line == 1 &&
6706 		    s->first_displayed_line > 1)
6707 			s->first_displayed_line--;
6708 		else
6709 			view->count = 0;
6710 		break;
6711 	case CTRL('u'):
6712 	case 'u':
6713 		nscroll /= 2;
6714 		/* FALL THROUGH */
6715 	case KEY_PPAGE:
6716 	case CTRL('b'):
6717 	case 'b':
6718 		if (s->first_displayed_line == 1) {
6719 			if (view->count > 1)
6720 				nscroll += nscroll;
6721 			s->selected_line = MAX(1, s->selected_line - nscroll);
6722 			view->count = 0;
6723 			break;
6724 		}
6725 		if (s->first_displayed_line > nscroll)
6726 			s->first_displayed_line -= nscroll;
6727 		else
6728 			s->first_displayed_line = 1;
6729 		break;
6730 	case 'j':
6731 	case KEY_DOWN:
6732 	case CTRL('n'):
6733 		if (s->selected_line < eos && s->first_displayed_line +
6734 		    s->selected_line <= s->blame.nlines)
6735 			s->selected_line++;
6736 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6737 			s->first_displayed_line++;
6738 		else
6739 			view->count = 0;
6740 		break;
6741 	case 'c':
6742 	case 'p': {
6743 		struct got_object_id *id = NULL;
6744 
6745 		view->count = 0;
6746 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6747 		    s->first_displayed_line, s->selected_line);
6748 		if (id == NULL)
6749 			break;
6750 		if (ch == 'p') {
6751 			struct got_commit_object *commit, *pcommit;
6752 			struct got_object_qid *pid;
6753 			struct got_object_id *blob_id = NULL;
6754 			int obj_type;
6755 			err = got_object_open_as_commit(&commit,
6756 			    s->repo, id);
6757 			if (err)
6758 				break;
6759 			pid = STAILQ_FIRST(
6760 			    got_object_commit_get_parent_ids(commit));
6761 			if (pid == NULL) {
6762 				got_object_commit_close(commit);
6763 				break;
6764 			}
6765 			/* Check if path history ends here. */
6766 			err = got_object_open_as_commit(&pcommit,
6767 			    s->repo, &pid->id);
6768 			if (err)
6769 				break;
6770 			err = got_object_id_by_path(&blob_id, s->repo,
6771 			    pcommit, s->path);
6772 			got_object_commit_close(pcommit);
6773 			if (err) {
6774 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6775 					err = NULL;
6776 				got_object_commit_close(commit);
6777 				break;
6778 			}
6779 			err = got_object_get_type(&obj_type, s->repo,
6780 			    blob_id);
6781 			free(blob_id);
6782 			/* Can't blame non-blob type objects. */
6783 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6784 				got_object_commit_close(commit);
6785 				break;
6786 			}
6787 			err = got_object_qid_alloc(&s->blamed_commit,
6788 			    &pid->id);
6789 			got_object_commit_close(commit);
6790 		} else {
6791 			if (got_object_id_cmp(id,
6792 			    &s->blamed_commit->id) == 0)
6793 				break;
6794 			err = got_object_qid_alloc(&s->blamed_commit,
6795 			    id);
6796 		}
6797 		if (err)
6798 			break;
6799 		s->done = 1;
6800 		thread_err = stop_blame(&s->blame);
6801 		s->done = 0;
6802 		if (thread_err)
6803 			break;
6804 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6805 		    s->blamed_commit, entry);
6806 		err = run_blame(view);
6807 		if (err)
6808 			break;
6809 		break;
6810 	}
6811 	case 'C': {
6812 		struct got_object_qid *first;
6813 
6814 		view->count = 0;
6815 		first = STAILQ_FIRST(&s->blamed_commits);
6816 		if (!got_object_id_cmp(&first->id, s->commit_id))
6817 			break;
6818 		s->done = 1;
6819 		thread_err = stop_blame(&s->blame);
6820 		s->done = 0;
6821 		if (thread_err)
6822 			break;
6823 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6824 		got_object_qid_free(s->blamed_commit);
6825 		s->blamed_commit =
6826 		    STAILQ_FIRST(&s->blamed_commits);
6827 		err = run_blame(view);
6828 		if (err)
6829 			break;
6830 		break;
6831 	}
6832 	case 'L':
6833 		view->count = 0;
6834 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6835 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6836 		if (s->id_to_log)
6837 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6838 		break;
6839 	case KEY_ENTER:
6840 	case '\r': {
6841 		struct got_object_id *id = NULL;
6842 		struct got_object_qid *pid;
6843 		struct got_commit_object *commit = NULL;
6844 
6845 		view->count = 0;
6846 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6847 		    s->first_displayed_line, s->selected_line);
6848 		if (id == NULL)
6849 			break;
6850 		err = got_object_open_as_commit(&commit, s->repo, id);
6851 		if (err)
6852 			break;
6853 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6854 		if (*new_view) {
6855 			/* traversed from diff view, release diff resources  */
6856 			err = close_diff_view(*new_view);
6857 			if (err)
6858 				break;
6859 			diff_view = *new_view;
6860 		} else {
6861 			if (view_is_parent_view(view))
6862 				view_get_split(view, &begin_y, &begin_x);
6863 
6864 			diff_view = view_open(0, 0, begin_y, begin_x,
6865 			    TOG_VIEW_DIFF);
6866 			if (diff_view == NULL) {
6867 				got_object_commit_close(commit);
6868 				err = got_error_from_errno("view_open");
6869 				break;
6870 			}
6871 		}
6872 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6873 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6874 		got_object_commit_close(commit);
6875 		if (err) {
6876 			view_close(diff_view);
6877 			break;
6878 		}
6879 		s->last_diffed_line = s->first_displayed_line - 1 +
6880 		    s->selected_line;
6881 		if (*new_view)
6882 			break;	/* still open from active diff view */
6883 		if (view_is_parent_view(view) &&
6884 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6885 			err = view_init_hsplit(view, begin_y);
6886 			if (err)
6887 				break;
6888 		}
6889 
6890 		view->focussed = 0;
6891 		diff_view->focussed = 1;
6892 		diff_view->mode = view->mode;
6893 		diff_view->nlines = view->lines - begin_y;
6894 		if (view_is_parent_view(view)) {
6895 			view_transfer_size(diff_view, view);
6896 			err = view_close_child(view);
6897 			if (err)
6898 				break;
6899 			err = view_set_child(view, diff_view);
6900 			if (err)
6901 				break;
6902 			view->focus_child = 1;
6903 		} else
6904 			*new_view = diff_view;
6905 		if (err)
6906 			break;
6907 		break;
6908 	}
6909 	case CTRL('d'):
6910 	case 'd':
6911 		nscroll /= 2;
6912 		/* FALL THROUGH */
6913 	case KEY_NPAGE:
6914 	case CTRL('f'):
6915 	case 'f':
6916 	case ' ':
6917 		if (s->last_displayed_line >= s->blame.nlines &&
6918 		    s->selected_line >= MIN(s->blame.nlines,
6919 		    view->nlines - 2)) {
6920 			view->count = 0;
6921 			break;
6922 		}
6923 		if (s->last_displayed_line >= s->blame.nlines &&
6924 		    s->selected_line < view->nlines - 2) {
6925 			s->selected_line +=
6926 			    MIN(nscroll, s->last_displayed_line -
6927 			    s->first_displayed_line - s->selected_line + 1);
6928 		}
6929 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6930 			s->first_displayed_line += nscroll;
6931 		else
6932 			s->first_displayed_line =
6933 			    s->blame.nlines - (view->nlines - 3);
6934 		break;
6935 	case KEY_RESIZE:
6936 		if (s->selected_line > view->nlines - 2) {
6937 			s->selected_line = MIN(s->blame.nlines,
6938 			    view->nlines - 2);
6939 		}
6940 		break;
6941 	default:
6942 		view->count = 0;
6943 		break;
6944 	}
6945 	return thread_err ? thread_err : err;
6946 }
6947 
6948 static const struct got_error *
6949 reset_blame_view(struct tog_view *view)
6950 {
6951 	const struct got_error *err;
6952 	struct tog_blame_view_state *s = &view->state.blame;
6953 
6954 	view->count = 0;
6955 	s->done = 1;
6956 	err = stop_blame(&s->blame);
6957 	s->done = 0;
6958 	if (err)
6959 		return err;
6960 	return run_blame(view);
6961 }
6962 
6963 static const struct got_error *
6964 cmd_blame(int argc, char *argv[])
6965 {
6966 	const struct got_error *error;
6967 	struct got_repository *repo = NULL;
6968 	struct got_worktree *worktree = NULL;
6969 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6970 	char *link_target = NULL;
6971 	struct got_object_id *commit_id = NULL;
6972 	struct got_commit_object *commit = NULL;
6973 	char *commit_id_str = NULL;
6974 	int ch;
6975 	struct tog_view *view = NULL;
6976 	int *pack_fds = NULL;
6977 
6978 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6979 		switch (ch) {
6980 		case 'c':
6981 			commit_id_str = optarg;
6982 			break;
6983 		case 'r':
6984 			repo_path = realpath(optarg, NULL);
6985 			if (repo_path == NULL)
6986 				return got_error_from_errno2("realpath",
6987 				    optarg);
6988 			break;
6989 		default:
6990 			usage_blame();
6991 			/* NOTREACHED */
6992 		}
6993 	}
6994 
6995 	argc -= optind;
6996 	argv += optind;
6997 
6998 	if (argc != 1)
6999 		usage_blame();
7000 
7001 	error = got_repo_pack_fds_open(&pack_fds);
7002 	if (error != NULL)
7003 		goto done;
7004 
7005 	if (repo_path == NULL) {
7006 		cwd = getcwd(NULL, 0);
7007 		if (cwd == NULL)
7008 			return got_error_from_errno("getcwd");
7009 		error = got_worktree_open(&worktree, cwd);
7010 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7011 			goto done;
7012 		if (worktree)
7013 			repo_path =
7014 			    strdup(got_worktree_get_repo_path(worktree));
7015 		else
7016 			repo_path = strdup(cwd);
7017 		if (repo_path == NULL) {
7018 			error = got_error_from_errno("strdup");
7019 			goto done;
7020 		}
7021 	}
7022 
7023 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7024 	if (error != NULL)
7025 		goto done;
7026 
7027 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7028 	    worktree);
7029 	if (error)
7030 		goto done;
7031 
7032 	init_curses();
7033 
7034 	error = apply_unveil(got_repo_get_path(repo), NULL);
7035 	if (error)
7036 		goto done;
7037 
7038 	error = tog_load_refs(repo, 0);
7039 	if (error)
7040 		goto done;
7041 
7042 	if (commit_id_str == NULL) {
7043 		struct got_reference *head_ref;
7044 		error = got_ref_open(&head_ref, repo, worktree ?
7045 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7046 		if (error != NULL)
7047 			goto done;
7048 		error = got_ref_resolve(&commit_id, repo, head_ref);
7049 		got_ref_close(head_ref);
7050 	} else {
7051 		error = got_repo_match_object_id(&commit_id, NULL,
7052 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7053 	}
7054 	if (error != NULL)
7055 		goto done;
7056 
7057 	error = got_object_open_as_commit(&commit, repo, commit_id);
7058 	if (error)
7059 		goto done;
7060 
7061 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7062 	    commit, repo);
7063 	if (error)
7064 		goto done;
7065 
7066 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7067 	if (view == NULL) {
7068 		error = got_error_from_errno("view_open");
7069 		goto done;
7070 	}
7071 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7072 	    commit_id, repo);
7073 	if (error != NULL) {
7074 		if (view->close == NULL)
7075 			close_blame_view(view);
7076 		view_close(view);
7077 		goto done;
7078 	}
7079 	if (worktree) {
7080 		/* Release work tree lock. */
7081 		got_worktree_close(worktree);
7082 		worktree = NULL;
7083 	}
7084 	error = view_loop(view);
7085 done:
7086 	free(repo_path);
7087 	free(in_repo_path);
7088 	free(link_target);
7089 	free(cwd);
7090 	free(commit_id);
7091 	if (commit)
7092 		got_object_commit_close(commit);
7093 	if (worktree)
7094 		got_worktree_close(worktree);
7095 	if (repo) {
7096 		const struct got_error *close_err = got_repo_close(repo);
7097 		if (error == NULL)
7098 			error = close_err;
7099 	}
7100 	if (pack_fds) {
7101 		const struct got_error *pack_err =
7102 		    got_repo_pack_fds_close(pack_fds);
7103 		if (error == NULL)
7104 			error = pack_err;
7105 	}
7106 	tog_free_refs();
7107 	return error;
7108 }
7109 
7110 static const struct got_error *
7111 draw_tree_entries(struct tog_view *view, const char *parent_path)
7112 {
7113 	struct tog_tree_view_state *s = &view->state.tree;
7114 	const struct got_error *err = NULL;
7115 	struct got_tree_entry *te;
7116 	wchar_t *wline;
7117 	char *index = NULL;
7118 	struct tog_color *tc;
7119 	int width, n, nentries, scrollx, i = 1;
7120 	int limit = view->nlines;
7121 
7122 	s->ndisplayed = 0;
7123 	if (view_is_hsplit_top(view))
7124 		--limit;  /* border */
7125 
7126 	werase(view->window);
7127 
7128 	if (limit == 0)
7129 		return NULL;
7130 
7131 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7132 	    0, 0);
7133 	if (err)
7134 		return err;
7135 	if (view_needs_focus_indication(view))
7136 		wstandout(view->window);
7137 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7138 	if (tc)
7139 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7140 	waddwstr(view->window, wline);
7141 	free(wline);
7142 	wline = NULL;
7143 	while (width++ < view->ncols)
7144 		waddch(view->window, ' ');
7145 	if (tc)
7146 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7147 	if (view_needs_focus_indication(view))
7148 		wstandend(view->window);
7149 	if (--limit <= 0)
7150 		return NULL;
7151 
7152 	i += s->selected;
7153 	if (s->first_displayed_entry) {
7154 		i += got_tree_entry_get_index(s->first_displayed_entry);
7155 		if (s->tree != s->root)
7156 			++i;  /* account for ".." entry */
7157 	}
7158 	nentries = got_object_tree_get_nentries(s->tree);
7159 	if (asprintf(&index, "[%d/%d] %s",
7160 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7161 		return got_error_from_errno("asprintf");
7162 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7163 	free(index);
7164 	if (err)
7165 		return err;
7166 	waddwstr(view->window, wline);
7167 	free(wline);
7168 	wline = NULL;
7169 	if (width < view->ncols - 1)
7170 		waddch(view->window, '\n');
7171 	if (--limit <= 0)
7172 		return NULL;
7173 	waddch(view->window, '\n');
7174 	if (--limit <= 0)
7175 		return NULL;
7176 
7177 	if (s->first_displayed_entry == NULL) {
7178 		te = got_object_tree_get_first_entry(s->tree);
7179 		if (s->selected == 0) {
7180 			if (view->focussed)
7181 				wstandout(view->window);
7182 			s->selected_entry = NULL;
7183 		}
7184 		waddstr(view->window, "  ..\n");	/* parent directory */
7185 		if (s->selected == 0 && view->focussed)
7186 			wstandend(view->window);
7187 		s->ndisplayed++;
7188 		if (--limit <= 0)
7189 			return NULL;
7190 		n = 1;
7191 	} else {
7192 		n = 0;
7193 		te = s->first_displayed_entry;
7194 	}
7195 
7196 	view->maxx = 0;
7197 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7198 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7199 		const char *modestr = "";
7200 		mode_t mode;
7201 
7202 		te = got_object_tree_get_entry(s->tree, i);
7203 		mode = got_tree_entry_get_mode(te);
7204 
7205 		if (s->show_ids) {
7206 			err = got_object_id_str(&id_str,
7207 			    got_tree_entry_get_id(te));
7208 			if (err)
7209 				return got_error_from_errno(
7210 				    "got_object_id_str");
7211 		}
7212 		if (got_object_tree_entry_is_submodule(te))
7213 			modestr = "$";
7214 		else if (S_ISLNK(mode)) {
7215 			int i;
7216 
7217 			err = got_tree_entry_get_symlink_target(&link_target,
7218 			    te, s->repo);
7219 			if (err) {
7220 				free(id_str);
7221 				return err;
7222 			}
7223 			for (i = 0; i < strlen(link_target); i++) {
7224 				if (!isprint((unsigned char)link_target[i]))
7225 					link_target[i] = '?';
7226 			}
7227 			modestr = "@";
7228 		}
7229 		else if (S_ISDIR(mode))
7230 			modestr = "/";
7231 		else if (mode & S_IXUSR)
7232 			modestr = "*";
7233 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7234 		    got_tree_entry_get_name(te), modestr,
7235 		    link_target ? " -> ": "",
7236 		    link_target ? link_target : "") == -1) {
7237 			free(id_str);
7238 			free(link_target);
7239 			return got_error_from_errno("asprintf");
7240 		}
7241 		free(id_str);
7242 		free(link_target);
7243 
7244 		/* use full line width to determine view->maxx */
7245 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7246 		if (err) {
7247 			free(line);
7248 			break;
7249 		}
7250 		view->maxx = MAX(view->maxx, width);
7251 		free(wline);
7252 		wline = NULL;
7253 
7254 		err = format_line(&wline, &width, &scrollx, line, view->x,
7255 		    view->ncols, 0, 0);
7256 		if (err) {
7257 			free(line);
7258 			break;
7259 		}
7260 		if (n == s->selected) {
7261 			if (view->focussed)
7262 				wstandout(view->window);
7263 			s->selected_entry = te;
7264 		}
7265 		tc = match_color(&s->colors, line);
7266 		if (tc)
7267 			wattr_on(view->window,
7268 			    COLOR_PAIR(tc->colorpair), NULL);
7269 		waddwstr(view->window, &wline[scrollx]);
7270 		if (tc)
7271 			wattr_off(view->window,
7272 			    COLOR_PAIR(tc->colorpair), NULL);
7273 		if (width < view->ncols)
7274 			waddch(view->window, '\n');
7275 		if (n == s->selected && view->focussed)
7276 			wstandend(view->window);
7277 		free(line);
7278 		free(wline);
7279 		wline = NULL;
7280 		n++;
7281 		s->ndisplayed++;
7282 		s->last_displayed_entry = te;
7283 		if (--limit <= 0)
7284 			break;
7285 	}
7286 
7287 	return err;
7288 }
7289 
7290 static void
7291 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7292 {
7293 	struct got_tree_entry *te;
7294 	int isroot = s->tree == s->root;
7295 	int i = 0;
7296 
7297 	if (s->first_displayed_entry == NULL)
7298 		return;
7299 
7300 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7301 	while (i++ < maxscroll) {
7302 		if (te == NULL) {
7303 			if (!isroot)
7304 				s->first_displayed_entry = NULL;
7305 			break;
7306 		}
7307 		s->first_displayed_entry = te;
7308 		te = got_tree_entry_get_prev(s->tree, te);
7309 	}
7310 }
7311 
7312 static const struct got_error *
7313 tree_scroll_down(struct tog_view *view, int maxscroll)
7314 {
7315 	struct tog_tree_view_state *s = &view->state.tree;
7316 	struct got_tree_entry *next, *last;
7317 	int n = 0;
7318 
7319 	if (s->first_displayed_entry)
7320 		next = got_tree_entry_get_next(s->tree,
7321 		    s->first_displayed_entry);
7322 	else
7323 		next = got_object_tree_get_first_entry(s->tree);
7324 
7325 	last = s->last_displayed_entry;
7326 	while (next && n++ < maxscroll) {
7327 		if (last) {
7328 			s->last_displayed_entry = last;
7329 			last = got_tree_entry_get_next(s->tree, last);
7330 		}
7331 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7332 			s->first_displayed_entry = next;
7333 			next = got_tree_entry_get_next(s->tree, next);
7334 		}
7335 	}
7336 
7337 	return NULL;
7338 }
7339 
7340 static const struct got_error *
7341 tree_entry_path(char **path, struct tog_parent_trees *parents,
7342     struct got_tree_entry *te)
7343 {
7344 	const struct got_error *err = NULL;
7345 	struct tog_parent_tree *pt;
7346 	size_t len = 2; /* for leading slash and NUL */
7347 
7348 	TAILQ_FOREACH(pt, parents, entry)
7349 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7350 		    + 1 /* slash */;
7351 	if (te)
7352 		len += strlen(got_tree_entry_get_name(te));
7353 
7354 	*path = calloc(1, len);
7355 	if (path == NULL)
7356 		return got_error_from_errno("calloc");
7357 
7358 	(*path)[0] = '/';
7359 	pt = TAILQ_LAST(parents, tog_parent_trees);
7360 	while (pt) {
7361 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7362 		if (strlcat(*path, name, len) >= len) {
7363 			err = got_error(GOT_ERR_NO_SPACE);
7364 			goto done;
7365 		}
7366 		if (strlcat(*path, "/", len) >= len) {
7367 			err = got_error(GOT_ERR_NO_SPACE);
7368 			goto done;
7369 		}
7370 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7371 	}
7372 	if (te) {
7373 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7374 			err = got_error(GOT_ERR_NO_SPACE);
7375 			goto done;
7376 		}
7377 	}
7378 done:
7379 	if (err) {
7380 		free(*path);
7381 		*path = NULL;
7382 	}
7383 	return err;
7384 }
7385 
7386 static const struct got_error *
7387 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7388     struct got_tree_entry *te, struct tog_parent_trees *parents,
7389     struct got_object_id *commit_id, struct got_repository *repo)
7390 {
7391 	const struct got_error *err = NULL;
7392 	char *path;
7393 	struct tog_view *blame_view;
7394 
7395 	*new_view = NULL;
7396 
7397 	err = tree_entry_path(&path, parents, te);
7398 	if (err)
7399 		return err;
7400 
7401 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7402 	if (blame_view == NULL) {
7403 		err = got_error_from_errno("view_open");
7404 		goto done;
7405 	}
7406 
7407 	err = open_blame_view(blame_view, path, commit_id, repo);
7408 	if (err) {
7409 		if (err->code == GOT_ERR_CANCELLED)
7410 			err = NULL;
7411 		view_close(blame_view);
7412 	} else
7413 		*new_view = blame_view;
7414 done:
7415 	free(path);
7416 	return err;
7417 }
7418 
7419 static const struct got_error *
7420 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7421     struct tog_tree_view_state *s)
7422 {
7423 	struct tog_view *log_view;
7424 	const struct got_error *err = NULL;
7425 	char *path;
7426 
7427 	*new_view = NULL;
7428 
7429 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7430 	if (log_view == NULL)
7431 		return got_error_from_errno("view_open");
7432 
7433 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7434 	if (err)
7435 		return err;
7436 
7437 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7438 	    path, 0);
7439 	if (err)
7440 		view_close(log_view);
7441 	else
7442 		*new_view = log_view;
7443 	free(path);
7444 	return err;
7445 }
7446 
7447 static const struct got_error *
7448 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7449     const char *head_ref_name, struct got_repository *repo)
7450 {
7451 	const struct got_error *err = NULL;
7452 	char *commit_id_str = NULL;
7453 	struct tog_tree_view_state *s = &view->state.tree;
7454 	struct got_commit_object *commit = NULL;
7455 
7456 	TAILQ_INIT(&s->parents);
7457 	STAILQ_INIT(&s->colors);
7458 
7459 	s->commit_id = got_object_id_dup(commit_id);
7460 	if (s->commit_id == NULL) {
7461 		err = got_error_from_errno("got_object_id_dup");
7462 		goto done;
7463 	}
7464 
7465 	err = got_object_open_as_commit(&commit, repo, commit_id);
7466 	if (err)
7467 		goto done;
7468 
7469 	/*
7470 	 * The root is opened here and will be closed when the view is closed.
7471 	 * Any visited subtrees and their path-wise parents are opened and
7472 	 * closed on demand.
7473 	 */
7474 	err = got_object_open_as_tree(&s->root, repo,
7475 	    got_object_commit_get_tree_id(commit));
7476 	if (err)
7477 		goto done;
7478 	s->tree = s->root;
7479 
7480 	err = got_object_id_str(&commit_id_str, commit_id);
7481 	if (err != NULL)
7482 		goto done;
7483 
7484 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7485 		err = got_error_from_errno("asprintf");
7486 		goto done;
7487 	}
7488 
7489 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7490 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7491 	if (head_ref_name) {
7492 		s->head_ref_name = strdup(head_ref_name);
7493 		if (s->head_ref_name == NULL) {
7494 			err = got_error_from_errno("strdup");
7495 			goto done;
7496 		}
7497 	}
7498 	s->repo = repo;
7499 
7500 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7501 		err = add_color(&s->colors, "\\$$",
7502 		    TOG_COLOR_TREE_SUBMODULE,
7503 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7504 		if (err)
7505 			goto done;
7506 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7507 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7508 		if (err)
7509 			goto done;
7510 		err = add_color(&s->colors, "/$",
7511 		    TOG_COLOR_TREE_DIRECTORY,
7512 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7513 		if (err)
7514 			goto done;
7515 
7516 		err = add_color(&s->colors, "\\*$",
7517 		    TOG_COLOR_TREE_EXECUTABLE,
7518 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7519 		if (err)
7520 			goto done;
7521 
7522 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7523 		    get_color_value("TOG_COLOR_COMMIT"));
7524 		if (err)
7525 			goto done;
7526 	}
7527 
7528 	view->show = show_tree_view;
7529 	view->input = input_tree_view;
7530 	view->close = close_tree_view;
7531 	view->search_start = search_start_tree_view;
7532 	view->search_next = search_next_tree_view;
7533 done:
7534 	free(commit_id_str);
7535 	if (commit)
7536 		got_object_commit_close(commit);
7537 	if (err) {
7538 		if (view->close == NULL)
7539 			close_tree_view(view);
7540 		view_close(view);
7541 	}
7542 	return err;
7543 }
7544 
7545 static const struct got_error *
7546 close_tree_view(struct tog_view *view)
7547 {
7548 	struct tog_tree_view_state *s = &view->state.tree;
7549 
7550 	free_colors(&s->colors);
7551 	free(s->tree_label);
7552 	s->tree_label = NULL;
7553 	free(s->commit_id);
7554 	s->commit_id = NULL;
7555 	free(s->head_ref_name);
7556 	s->head_ref_name = NULL;
7557 	while (!TAILQ_EMPTY(&s->parents)) {
7558 		struct tog_parent_tree *parent;
7559 		parent = TAILQ_FIRST(&s->parents);
7560 		TAILQ_REMOVE(&s->parents, parent, entry);
7561 		if (parent->tree != s->root)
7562 			got_object_tree_close(parent->tree);
7563 		free(parent);
7564 
7565 	}
7566 	if (s->tree != NULL && s->tree != s->root)
7567 		got_object_tree_close(s->tree);
7568 	if (s->root)
7569 		got_object_tree_close(s->root);
7570 	return NULL;
7571 }
7572 
7573 static const struct got_error *
7574 search_start_tree_view(struct tog_view *view)
7575 {
7576 	struct tog_tree_view_state *s = &view->state.tree;
7577 
7578 	s->matched_entry = NULL;
7579 	return NULL;
7580 }
7581 
7582 static int
7583 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7584 {
7585 	regmatch_t regmatch;
7586 
7587 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7588 	    0) == 0;
7589 }
7590 
7591 static const struct got_error *
7592 search_next_tree_view(struct tog_view *view)
7593 {
7594 	struct tog_tree_view_state *s = &view->state.tree;
7595 	struct got_tree_entry *te = NULL;
7596 
7597 	if (!view->searching) {
7598 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7599 		return NULL;
7600 	}
7601 
7602 	if (s->matched_entry) {
7603 		if (view->searching == TOG_SEARCH_FORWARD) {
7604 			if (s->selected_entry)
7605 				te = got_tree_entry_get_next(s->tree,
7606 				    s->selected_entry);
7607 			else
7608 				te = got_object_tree_get_first_entry(s->tree);
7609 		} else {
7610 			if (s->selected_entry == NULL)
7611 				te = got_object_tree_get_last_entry(s->tree);
7612 			else
7613 				te = got_tree_entry_get_prev(s->tree,
7614 				    s->selected_entry);
7615 		}
7616 	} else {
7617 		if (s->selected_entry)
7618 			te = s->selected_entry;
7619 		else if (view->searching == TOG_SEARCH_FORWARD)
7620 			te = got_object_tree_get_first_entry(s->tree);
7621 		else
7622 			te = got_object_tree_get_last_entry(s->tree);
7623 	}
7624 
7625 	while (1) {
7626 		if (te == NULL) {
7627 			if (s->matched_entry == NULL) {
7628 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7629 				return NULL;
7630 			}
7631 			if (view->searching == TOG_SEARCH_FORWARD)
7632 				te = got_object_tree_get_first_entry(s->tree);
7633 			else
7634 				te = got_object_tree_get_last_entry(s->tree);
7635 		}
7636 
7637 		if (match_tree_entry(te, &view->regex)) {
7638 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7639 			s->matched_entry = te;
7640 			break;
7641 		}
7642 
7643 		if (view->searching == TOG_SEARCH_FORWARD)
7644 			te = got_tree_entry_get_next(s->tree, te);
7645 		else
7646 			te = got_tree_entry_get_prev(s->tree, te);
7647 	}
7648 
7649 	if (s->matched_entry) {
7650 		s->first_displayed_entry = s->matched_entry;
7651 		s->selected = 0;
7652 	}
7653 
7654 	return NULL;
7655 }
7656 
7657 static const struct got_error *
7658 show_tree_view(struct tog_view *view)
7659 {
7660 	const struct got_error *err = NULL;
7661 	struct tog_tree_view_state *s = &view->state.tree;
7662 	char *parent_path;
7663 
7664 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7665 	if (err)
7666 		return err;
7667 
7668 	err = draw_tree_entries(view, parent_path);
7669 	free(parent_path);
7670 
7671 	view_border(view);
7672 	return err;
7673 }
7674 
7675 static const struct got_error *
7676 tree_goto_line(struct tog_view *view, int nlines)
7677 {
7678 	const struct got_error		 *err = NULL;
7679 	struct tog_tree_view_state	 *s = &view->state.tree;
7680 	struct got_tree_entry		**fte, **lte, **ste;
7681 	int				  g, last, first = 1, i = 1;
7682 	int				  root = s->tree == s->root;
7683 	int				  off = root ? 1 : 2;
7684 
7685 	g = view->gline;
7686 	view->gline = 0;
7687 
7688 	if (g == 0)
7689 		g = 1;
7690 	else if (g > got_object_tree_get_nentries(s->tree))
7691 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7692 
7693 	fte = &s->first_displayed_entry;
7694 	lte = &s->last_displayed_entry;
7695 	ste = &s->selected_entry;
7696 
7697 	if (*fte != NULL) {
7698 		first = got_tree_entry_get_index(*fte);
7699 		first += off;  /* account for ".." */
7700 	}
7701 	last = got_tree_entry_get_index(*lte);
7702 	last += off;
7703 
7704 	if (g >= first && g <= last && g - first < nlines) {
7705 		s->selected = g - first;
7706 		return NULL;	/* gline is on the current page */
7707 	}
7708 
7709 	if (*ste != NULL) {
7710 		i = got_tree_entry_get_index(*ste);
7711 		i += off;
7712 	}
7713 
7714 	if (i < g) {
7715 		err = tree_scroll_down(view, g - i);
7716 		if (err)
7717 			return err;
7718 		if (got_tree_entry_get_index(*lte) >=
7719 		    got_object_tree_get_nentries(s->tree) - 1 &&
7720 		    first + s->selected < g &&
7721 		    s->selected < s->ndisplayed - 1) {
7722 			first = got_tree_entry_get_index(*fte);
7723 			first += off;
7724 			s->selected = g - first;
7725 		}
7726 	} else if (i > g)
7727 		tree_scroll_up(s, i - g);
7728 
7729 	if (g < nlines &&
7730 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7731 		s->selected = g - 1;
7732 
7733 	return NULL;
7734 }
7735 
7736 static const struct got_error *
7737 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7738 {
7739 	const struct got_error *err = NULL;
7740 	struct tog_tree_view_state *s = &view->state.tree;
7741 	struct got_tree_entry *te;
7742 	int n, nscroll = view->nlines - 3;
7743 
7744 	if (view->gline)
7745 		return tree_goto_line(view, nscroll);
7746 
7747 	switch (ch) {
7748 	case '0':
7749 	case '$':
7750 	case KEY_RIGHT:
7751 	case 'l':
7752 	case KEY_LEFT:
7753 	case 'h':
7754 		horizontal_scroll_input(view, ch);
7755 		break;
7756 	case 'i':
7757 		s->show_ids = !s->show_ids;
7758 		view->count = 0;
7759 		break;
7760 	case 'L':
7761 		view->count = 0;
7762 		if (!s->selected_entry)
7763 			break;
7764 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7765 		break;
7766 	case 'R':
7767 		view->count = 0;
7768 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7769 		break;
7770 	case 'g':
7771 	case '=':
7772 	case KEY_HOME:
7773 		s->selected = 0;
7774 		view->count = 0;
7775 		if (s->tree == s->root)
7776 			s->first_displayed_entry =
7777 			    got_object_tree_get_first_entry(s->tree);
7778 		else
7779 			s->first_displayed_entry = NULL;
7780 		break;
7781 	case 'G':
7782 	case '*':
7783 	case KEY_END: {
7784 		int eos = view->nlines - 3;
7785 
7786 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7787 			--eos;  /* border */
7788 		s->selected = 0;
7789 		view->count = 0;
7790 		te = got_object_tree_get_last_entry(s->tree);
7791 		for (n = 0; n < eos; n++) {
7792 			if (te == NULL) {
7793 				if (s->tree != s->root) {
7794 					s->first_displayed_entry = NULL;
7795 					n++;
7796 				}
7797 				break;
7798 			}
7799 			s->first_displayed_entry = te;
7800 			te = got_tree_entry_get_prev(s->tree, te);
7801 		}
7802 		if (n > 0)
7803 			s->selected = n - 1;
7804 		break;
7805 	}
7806 	case 'k':
7807 	case KEY_UP:
7808 	case CTRL('p'):
7809 		if (s->selected > 0) {
7810 			s->selected--;
7811 			break;
7812 		}
7813 		tree_scroll_up(s, 1);
7814 		if (s->selected_entry == NULL ||
7815 		    (s->tree == s->root && s->selected_entry ==
7816 		     got_object_tree_get_first_entry(s->tree)))
7817 			view->count = 0;
7818 		break;
7819 	case CTRL('u'):
7820 	case 'u':
7821 		nscroll /= 2;
7822 		/* FALL THROUGH */
7823 	case KEY_PPAGE:
7824 	case CTRL('b'):
7825 	case 'b':
7826 		if (s->tree == s->root) {
7827 			if (got_object_tree_get_first_entry(s->tree) ==
7828 			    s->first_displayed_entry)
7829 				s->selected -= MIN(s->selected, nscroll);
7830 		} else {
7831 			if (s->first_displayed_entry == NULL)
7832 				s->selected -= MIN(s->selected, nscroll);
7833 		}
7834 		tree_scroll_up(s, MAX(0, nscroll));
7835 		if (s->selected_entry == NULL ||
7836 		    (s->tree == s->root && s->selected_entry ==
7837 		     got_object_tree_get_first_entry(s->tree)))
7838 			view->count = 0;
7839 		break;
7840 	case 'j':
7841 	case KEY_DOWN:
7842 	case CTRL('n'):
7843 		if (s->selected < s->ndisplayed - 1) {
7844 			s->selected++;
7845 			break;
7846 		}
7847 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7848 		    == NULL) {
7849 			/* can't scroll any further */
7850 			view->count = 0;
7851 			break;
7852 		}
7853 		tree_scroll_down(view, 1);
7854 		break;
7855 	case CTRL('d'):
7856 	case 'd':
7857 		nscroll /= 2;
7858 		/* FALL THROUGH */
7859 	case KEY_NPAGE:
7860 	case CTRL('f'):
7861 	case 'f':
7862 	case ' ':
7863 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7864 		    == NULL) {
7865 			/* can't scroll any further; move cursor down */
7866 			if (s->selected < s->ndisplayed - 1)
7867 				s->selected += MIN(nscroll,
7868 				    s->ndisplayed - s->selected - 1);
7869 			else
7870 				view->count = 0;
7871 			break;
7872 		}
7873 		tree_scroll_down(view, nscroll);
7874 		break;
7875 	case KEY_ENTER:
7876 	case '\r':
7877 	case KEY_BACKSPACE:
7878 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7879 			struct tog_parent_tree *parent;
7880 			/* user selected '..' */
7881 			if (s->tree == s->root) {
7882 				view->count = 0;
7883 				break;
7884 			}
7885 			parent = TAILQ_FIRST(&s->parents);
7886 			TAILQ_REMOVE(&s->parents, parent,
7887 			    entry);
7888 			got_object_tree_close(s->tree);
7889 			s->tree = parent->tree;
7890 			s->first_displayed_entry =
7891 			    parent->first_displayed_entry;
7892 			s->selected_entry =
7893 			    parent->selected_entry;
7894 			s->selected = parent->selected;
7895 			if (s->selected > view->nlines - 3) {
7896 				err = offset_selection_down(view);
7897 				if (err)
7898 					break;
7899 			}
7900 			free(parent);
7901 		} else if (S_ISDIR(got_tree_entry_get_mode(
7902 		    s->selected_entry))) {
7903 			struct got_tree_object *subtree;
7904 			view->count = 0;
7905 			err = got_object_open_as_tree(&subtree, s->repo,
7906 			    got_tree_entry_get_id(s->selected_entry));
7907 			if (err)
7908 				break;
7909 			err = tree_view_visit_subtree(s, subtree);
7910 			if (err) {
7911 				got_object_tree_close(subtree);
7912 				break;
7913 			}
7914 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7915 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7916 		break;
7917 	case KEY_RESIZE:
7918 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7919 			s->selected = view->nlines - 4;
7920 		view->count = 0;
7921 		break;
7922 	default:
7923 		view->count = 0;
7924 		break;
7925 	}
7926 
7927 	return err;
7928 }
7929 
7930 __dead static void
7931 usage_tree(void)
7932 {
7933 	endwin();
7934 	fprintf(stderr,
7935 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7936 	    getprogname());
7937 	exit(1);
7938 }
7939 
7940 static const struct got_error *
7941 cmd_tree(int argc, char *argv[])
7942 {
7943 	const struct got_error *error;
7944 	struct got_repository *repo = NULL;
7945 	struct got_worktree *worktree = NULL;
7946 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7947 	struct got_object_id *commit_id = NULL;
7948 	struct got_commit_object *commit = NULL;
7949 	const char *commit_id_arg = NULL;
7950 	char *label = NULL;
7951 	struct got_reference *ref = NULL;
7952 	const char *head_ref_name = NULL;
7953 	int ch;
7954 	struct tog_view *view;
7955 	int *pack_fds = NULL;
7956 
7957 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7958 		switch (ch) {
7959 		case 'c':
7960 			commit_id_arg = optarg;
7961 			break;
7962 		case 'r':
7963 			repo_path = realpath(optarg, NULL);
7964 			if (repo_path == NULL)
7965 				return got_error_from_errno2("realpath",
7966 				    optarg);
7967 			break;
7968 		default:
7969 			usage_tree();
7970 			/* NOTREACHED */
7971 		}
7972 	}
7973 
7974 	argc -= optind;
7975 	argv += optind;
7976 
7977 	if (argc > 1)
7978 		usage_tree();
7979 
7980 	error = got_repo_pack_fds_open(&pack_fds);
7981 	if (error != NULL)
7982 		goto done;
7983 
7984 	if (repo_path == NULL) {
7985 		cwd = getcwd(NULL, 0);
7986 		if (cwd == NULL)
7987 			return got_error_from_errno("getcwd");
7988 		error = got_worktree_open(&worktree, cwd);
7989 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7990 			goto done;
7991 		if (worktree)
7992 			repo_path =
7993 			    strdup(got_worktree_get_repo_path(worktree));
7994 		else
7995 			repo_path = strdup(cwd);
7996 		if (repo_path == NULL) {
7997 			error = got_error_from_errno("strdup");
7998 			goto done;
7999 		}
8000 	}
8001 
8002 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8003 	if (error != NULL)
8004 		goto done;
8005 
8006 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8007 	    repo, worktree);
8008 	if (error)
8009 		goto done;
8010 
8011 	init_curses();
8012 
8013 	error = apply_unveil(got_repo_get_path(repo), NULL);
8014 	if (error)
8015 		goto done;
8016 
8017 	error = tog_load_refs(repo, 0);
8018 	if (error)
8019 		goto done;
8020 
8021 	if (commit_id_arg == NULL) {
8022 		error = got_repo_match_object_id(&commit_id, &label,
8023 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8024 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8025 		if (error)
8026 			goto done;
8027 		head_ref_name = label;
8028 	} else {
8029 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8030 		if (error == NULL)
8031 			head_ref_name = got_ref_get_name(ref);
8032 		else if (error->code != GOT_ERR_NOT_REF)
8033 			goto done;
8034 		error = got_repo_match_object_id(&commit_id, NULL,
8035 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8036 		if (error)
8037 			goto done;
8038 	}
8039 
8040 	error = got_object_open_as_commit(&commit, repo, commit_id);
8041 	if (error)
8042 		goto done;
8043 
8044 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8045 	if (view == NULL) {
8046 		error = got_error_from_errno("view_open");
8047 		goto done;
8048 	}
8049 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8050 	if (error)
8051 		goto done;
8052 	if (!got_path_is_root_dir(in_repo_path)) {
8053 		error = tree_view_walk_path(&view->state.tree, commit,
8054 		    in_repo_path);
8055 		if (error)
8056 			goto done;
8057 	}
8058 
8059 	if (worktree) {
8060 		/* Release work tree lock. */
8061 		got_worktree_close(worktree);
8062 		worktree = NULL;
8063 	}
8064 	error = view_loop(view);
8065 done:
8066 	free(repo_path);
8067 	free(cwd);
8068 	free(commit_id);
8069 	free(label);
8070 	if (ref)
8071 		got_ref_close(ref);
8072 	if (repo) {
8073 		const struct got_error *close_err = got_repo_close(repo);
8074 		if (error == NULL)
8075 			error = close_err;
8076 	}
8077 	if (pack_fds) {
8078 		const struct got_error *pack_err =
8079 		    got_repo_pack_fds_close(pack_fds);
8080 		if (error == NULL)
8081 			error = pack_err;
8082 	}
8083 	tog_free_refs();
8084 	return error;
8085 }
8086 
8087 static const struct got_error *
8088 ref_view_load_refs(struct tog_ref_view_state *s)
8089 {
8090 	struct got_reflist_entry *sre;
8091 	struct tog_reflist_entry *re;
8092 
8093 	s->nrefs = 0;
8094 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8095 		if (strncmp(got_ref_get_name(sre->ref),
8096 		    "refs/got/", 9) == 0 &&
8097 		    strncmp(got_ref_get_name(sre->ref),
8098 		    "refs/got/backup/", 16) != 0)
8099 			continue;
8100 
8101 		re = malloc(sizeof(*re));
8102 		if (re == NULL)
8103 			return got_error_from_errno("malloc");
8104 
8105 		re->ref = got_ref_dup(sre->ref);
8106 		if (re->ref == NULL)
8107 			return got_error_from_errno("got_ref_dup");
8108 		re->idx = s->nrefs++;
8109 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8110 	}
8111 
8112 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8113 	return NULL;
8114 }
8115 
8116 static void
8117 ref_view_free_refs(struct tog_ref_view_state *s)
8118 {
8119 	struct tog_reflist_entry *re;
8120 
8121 	while (!TAILQ_EMPTY(&s->refs)) {
8122 		re = TAILQ_FIRST(&s->refs);
8123 		TAILQ_REMOVE(&s->refs, re, entry);
8124 		got_ref_close(re->ref);
8125 		free(re);
8126 	}
8127 }
8128 
8129 static const struct got_error *
8130 open_ref_view(struct tog_view *view, struct got_repository *repo)
8131 {
8132 	const struct got_error *err = NULL;
8133 	struct tog_ref_view_state *s = &view->state.ref;
8134 
8135 	s->selected_entry = 0;
8136 	s->repo = repo;
8137 
8138 	TAILQ_INIT(&s->refs);
8139 	STAILQ_INIT(&s->colors);
8140 
8141 	err = ref_view_load_refs(s);
8142 	if (err)
8143 		goto done;
8144 
8145 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8146 		err = add_color(&s->colors, "^refs/heads/",
8147 		    TOG_COLOR_REFS_HEADS,
8148 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8149 		if (err)
8150 			goto done;
8151 
8152 		err = add_color(&s->colors, "^refs/tags/",
8153 		    TOG_COLOR_REFS_TAGS,
8154 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8155 		if (err)
8156 			goto done;
8157 
8158 		err = add_color(&s->colors, "^refs/remotes/",
8159 		    TOG_COLOR_REFS_REMOTES,
8160 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8161 		if (err)
8162 			goto done;
8163 
8164 		err = add_color(&s->colors, "^refs/got/backup/",
8165 		    TOG_COLOR_REFS_BACKUP,
8166 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8167 		if (err)
8168 			goto done;
8169 	}
8170 
8171 	view->show = show_ref_view;
8172 	view->input = input_ref_view;
8173 	view->close = close_ref_view;
8174 	view->search_start = search_start_ref_view;
8175 	view->search_next = search_next_ref_view;
8176 done:
8177 	if (err) {
8178 		if (view->close == NULL)
8179 			close_ref_view(view);
8180 		view_close(view);
8181 	}
8182 	return err;
8183 }
8184 
8185 static const struct got_error *
8186 close_ref_view(struct tog_view *view)
8187 {
8188 	struct tog_ref_view_state *s = &view->state.ref;
8189 
8190 	ref_view_free_refs(s);
8191 	free_colors(&s->colors);
8192 
8193 	return NULL;
8194 }
8195 
8196 static const struct got_error *
8197 resolve_reflist_entry(struct got_object_id **commit_id,
8198     struct tog_reflist_entry *re, struct got_repository *repo)
8199 {
8200 	const struct got_error *err = NULL;
8201 	struct got_object_id *obj_id;
8202 	struct got_tag_object *tag = NULL;
8203 	int obj_type;
8204 
8205 	*commit_id = NULL;
8206 
8207 	err = got_ref_resolve(&obj_id, repo, re->ref);
8208 	if (err)
8209 		return err;
8210 
8211 	err = got_object_get_type(&obj_type, repo, obj_id);
8212 	if (err)
8213 		goto done;
8214 
8215 	switch (obj_type) {
8216 	case GOT_OBJ_TYPE_COMMIT:
8217 		*commit_id = obj_id;
8218 		break;
8219 	case GOT_OBJ_TYPE_TAG:
8220 		err = got_object_open_as_tag(&tag, repo, obj_id);
8221 		if (err)
8222 			goto done;
8223 		free(obj_id);
8224 		err = got_object_get_type(&obj_type, repo,
8225 		    got_object_tag_get_object_id(tag));
8226 		if (err)
8227 			goto done;
8228 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8229 			err = got_error(GOT_ERR_OBJ_TYPE);
8230 			goto done;
8231 		}
8232 		*commit_id = got_object_id_dup(
8233 		    got_object_tag_get_object_id(tag));
8234 		if (*commit_id == NULL) {
8235 			err = got_error_from_errno("got_object_id_dup");
8236 			goto done;
8237 		}
8238 		break;
8239 	default:
8240 		err = got_error(GOT_ERR_OBJ_TYPE);
8241 		break;
8242 	}
8243 
8244 done:
8245 	if (tag)
8246 		got_object_tag_close(tag);
8247 	if (err) {
8248 		free(*commit_id);
8249 		*commit_id = NULL;
8250 	}
8251 	return err;
8252 }
8253 
8254 static const struct got_error *
8255 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8256     struct tog_reflist_entry *re, struct got_repository *repo)
8257 {
8258 	struct tog_view *log_view;
8259 	const struct got_error *err = NULL;
8260 	struct got_object_id *commit_id = NULL;
8261 
8262 	*new_view = NULL;
8263 
8264 	err = resolve_reflist_entry(&commit_id, re, repo);
8265 	if (err) {
8266 		if (err->code != GOT_ERR_OBJ_TYPE)
8267 			return err;
8268 		else
8269 			return NULL;
8270 	}
8271 
8272 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8273 	if (log_view == NULL) {
8274 		err = got_error_from_errno("view_open");
8275 		goto done;
8276 	}
8277 
8278 	err = open_log_view(log_view, commit_id, repo,
8279 	    got_ref_get_name(re->ref), "", 0);
8280 done:
8281 	if (err)
8282 		view_close(log_view);
8283 	else
8284 		*new_view = log_view;
8285 	free(commit_id);
8286 	return err;
8287 }
8288 
8289 static void
8290 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8291 {
8292 	struct tog_reflist_entry *re;
8293 	int i = 0;
8294 
8295 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8296 		return;
8297 
8298 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8299 	while (i++ < maxscroll) {
8300 		if (re == NULL)
8301 			break;
8302 		s->first_displayed_entry = re;
8303 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8304 	}
8305 }
8306 
8307 static const struct got_error *
8308 ref_scroll_down(struct tog_view *view, int maxscroll)
8309 {
8310 	struct tog_ref_view_state *s = &view->state.ref;
8311 	struct tog_reflist_entry *next, *last;
8312 	int n = 0;
8313 
8314 	if (s->first_displayed_entry)
8315 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8316 	else
8317 		next = TAILQ_FIRST(&s->refs);
8318 
8319 	last = s->last_displayed_entry;
8320 	while (next && n++ < maxscroll) {
8321 		if (last) {
8322 			s->last_displayed_entry = last;
8323 			last = TAILQ_NEXT(last, entry);
8324 		}
8325 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8326 			s->first_displayed_entry = next;
8327 			next = TAILQ_NEXT(next, entry);
8328 		}
8329 	}
8330 
8331 	return NULL;
8332 }
8333 
8334 static const struct got_error *
8335 search_start_ref_view(struct tog_view *view)
8336 {
8337 	struct tog_ref_view_state *s = &view->state.ref;
8338 
8339 	s->matched_entry = NULL;
8340 	return NULL;
8341 }
8342 
8343 static int
8344 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8345 {
8346 	regmatch_t regmatch;
8347 
8348 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8349 	    0) == 0;
8350 }
8351 
8352 static const struct got_error *
8353 search_next_ref_view(struct tog_view *view)
8354 {
8355 	struct tog_ref_view_state *s = &view->state.ref;
8356 	struct tog_reflist_entry *re = NULL;
8357 
8358 	if (!view->searching) {
8359 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8360 		return NULL;
8361 	}
8362 
8363 	if (s->matched_entry) {
8364 		if (view->searching == TOG_SEARCH_FORWARD) {
8365 			if (s->selected_entry)
8366 				re = TAILQ_NEXT(s->selected_entry, entry);
8367 			else
8368 				re = TAILQ_PREV(s->selected_entry,
8369 				    tog_reflist_head, entry);
8370 		} else {
8371 			if (s->selected_entry == NULL)
8372 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8373 			else
8374 				re = TAILQ_PREV(s->selected_entry,
8375 				    tog_reflist_head, entry);
8376 		}
8377 	} else {
8378 		if (s->selected_entry)
8379 			re = s->selected_entry;
8380 		else if (view->searching == TOG_SEARCH_FORWARD)
8381 			re = TAILQ_FIRST(&s->refs);
8382 		else
8383 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8384 	}
8385 
8386 	while (1) {
8387 		if (re == NULL) {
8388 			if (s->matched_entry == NULL) {
8389 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8390 				return NULL;
8391 			}
8392 			if (view->searching == TOG_SEARCH_FORWARD)
8393 				re = TAILQ_FIRST(&s->refs);
8394 			else
8395 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8396 		}
8397 
8398 		if (match_reflist_entry(re, &view->regex)) {
8399 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8400 			s->matched_entry = re;
8401 			break;
8402 		}
8403 
8404 		if (view->searching == TOG_SEARCH_FORWARD)
8405 			re = TAILQ_NEXT(re, entry);
8406 		else
8407 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8408 	}
8409 
8410 	if (s->matched_entry) {
8411 		s->first_displayed_entry = s->matched_entry;
8412 		s->selected = 0;
8413 	}
8414 
8415 	return NULL;
8416 }
8417 
8418 static const struct got_error *
8419 show_ref_view(struct tog_view *view)
8420 {
8421 	const struct got_error *err = NULL;
8422 	struct tog_ref_view_state *s = &view->state.ref;
8423 	struct tog_reflist_entry *re;
8424 	char *line = NULL;
8425 	wchar_t *wline;
8426 	struct tog_color *tc;
8427 	int width, n, scrollx;
8428 	int limit = view->nlines;
8429 
8430 	werase(view->window);
8431 
8432 	s->ndisplayed = 0;
8433 	if (view_is_hsplit_top(view))
8434 		--limit;  /* border */
8435 
8436 	if (limit == 0)
8437 		return NULL;
8438 
8439 	re = s->first_displayed_entry;
8440 
8441 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8442 	    s->nrefs) == -1)
8443 		return got_error_from_errno("asprintf");
8444 
8445 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8446 	if (err) {
8447 		free(line);
8448 		return err;
8449 	}
8450 	if (view_needs_focus_indication(view))
8451 		wstandout(view->window);
8452 	waddwstr(view->window, wline);
8453 	while (width++ < view->ncols)
8454 		waddch(view->window, ' ');
8455 	if (view_needs_focus_indication(view))
8456 		wstandend(view->window);
8457 	free(wline);
8458 	wline = NULL;
8459 	free(line);
8460 	line = NULL;
8461 	if (--limit <= 0)
8462 		return NULL;
8463 
8464 	n = 0;
8465 	view->maxx = 0;
8466 	while (re && limit > 0) {
8467 		char *line = NULL;
8468 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8469 
8470 		if (s->show_date) {
8471 			struct got_commit_object *ci;
8472 			struct got_tag_object *tag;
8473 			struct got_object_id *id;
8474 			struct tm tm;
8475 			time_t t;
8476 
8477 			err = got_ref_resolve(&id, s->repo, re->ref);
8478 			if (err)
8479 				return err;
8480 			err = got_object_open_as_tag(&tag, s->repo, id);
8481 			if (err) {
8482 				if (err->code != GOT_ERR_OBJ_TYPE) {
8483 					free(id);
8484 					return err;
8485 				}
8486 				err = got_object_open_as_commit(&ci, s->repo,
8487 				    id);
8488 				if (err) {
8489 					free(id);
8490 					return err;
8491 				}
8492 				t = got_object_commit_get_committer_time(ci);
8493 				got_object_commit_close(ci);
8494 			} else {
8495 				t = got_object_tag_get_tagger_time(tag);
8496 				got_object_tag_close(tag);
8497 			}
8498 			free(id);
8499 			if (gmtime_r(&t, &tm) == NULL)
8500 				return got_error_from_errno("gmtime_r");
8501 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8502 				return got_error(GOT_ERR_NO_SPACE);
8503 		}
8504 		if (got_ref_is_symbolic(re->ref)) {
8505 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8506 			    ymd : "", got_ref_get_name(re->ref),
8507 			    got_ref_get_symref_target(re->ref)) == -1)
8508 				return got_error_from_errno("asprintf");
8509 		} else if (s->show_ids) {
8510 			struct got_object_id *id;
8511 			char *id_str;
8512 			err = got_ref_resolve(&id, s->repo, re->ref);
8513 			if (err)
8514 				return err;
8515 			err = got_object_id_str(&id_str, id);
8516 			if (err) {
8517 				free(id);
8518 				return err;
8519 			}
8520 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8521 			    got_ref_get_name(re->ref), id_str) == -1) {
8522 				err = got_error_from_errno("asprintf");
8523 				free(id);
8524 				free(id_str);
8525 				return err;
8526 			}
8527 			free(id);
8528 			free(id_str);
8529 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8530 		    got_ref_get_name(re->ref)) == -1)
8531 			return got_error_from_errno("asprintf");
8532 
8533 		/* use full line width to determine view->maxx */
8534 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8535 		if (err) {
8536 			free(line);
8537 			return err;
8538 		}
8539 		view->maxx = MAX(view->maxx, width);
8540 		free(wline);
8541 		wline = NULL;
8542 
8543 		err = format_line(&wline, &width, &scrollx, line, view->x,
8544 		    view->ncols, 0, 0);
8545 		if (err) {
8546 			free(line);
8547 			return err;
8548 		}
8549 		if (n == s->selected) {
8550 			if (view->focussed)
8551 				wstandout(view->window);
8552 			s->selected_entry = re;
8553 		}
8554 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8555 		if (tc)
8556 			wattr_on(view->window,
8557 			    COLOR_PAIR(tc->colorpair), NULL);
8558 		waddwstr(view->window, &wline[scrollx]);
8559 		if (tc)
8560 			wattr_off(view->window,
8561 			    COLOR_PAIR(tc->colorpair), NULL);
8562 		if (width < view->ncols)
8563 			waddch(view->window, '\n');
8564 		if (n == s->selected && view->focussed)
8565 			wstandend(view->window);
8566 		free(line);
8567 		free(wline);
8568 		wline = NULL;
8569 		n++;
8570 		s->ndisplayed++;
8571 		s->last_displayed_entry = re;
8572 
8573 		limit--;
8574 		re = TAILQ_NEXT(re, entry);
8575 	}
8576 
8577 	view_border(view);
8578 	return err;
8579 }
8580 
8581 static const struct got_error *
8582 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8583     struct tog_reflist_entry *re, struct got_repository *repo)
8584 {
8585 	const struct got_error *err = NULL;
8586 	struct got_object_id *commit_id = NULL;
8587 	struct tog_view *tree_view;
8588 
8589 	*new_view = NULL;
8590 
8591 	err = resolve_reflist_entry(&commit_id, re, repo);
8592 	if (err) {
8593 		if (err->code != GOT_ERR_OBJ_TYPE)
8594 			return err;
8595 		else
8596 			return NULL;
8597 	}
8598 
8599 
8600 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8601 	if (tree_view == NULL) {
8602 		err = got_error_from_errno("view_open");
8603 		goto done;
8604 	}
8605 
8606 	err = open_tree_view(tree_view, commit_id,
8607 	    got_ref_get_name(re->ref), repo);
8608 	if (err)
8609 		goto done;
8610 
8611 	*new_view = tree_view;
8612 done:
8613 	free(commit_id);
8614 	return err;
8615 }
8616 
8617 static const struct got_error *
8618 ref_goto_line(struct tog_view *view, int nlines)
8619 {
8620 	const struct got_error		*err = NULL;
8621 	struct tog_ref_view_state	*s = &view->state.ref;
8622 	int				 g, idx = s->selected_entry->idx;
8623 
8624 	g = view->gline;
8625 	view->gline = 0;
8626 
8627 	if (g == 0)
8628 		g = 1;
8629 	else if (g > s->nrefs)
8630 		g = s->nrefs;
8631 
8632 	if (g >= s->first_displayed_entry->idx + 1 &&
8633 	    g <= s->last_displayed_entry->idx + 1 &&
8634 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8635 		s->selected = g - s->first_displayed_entry->idx - 1;
8636 		return NULL;
8637 	}
8638 
8639 	if (idx + 1 < g) {
8640 		err = ref_scroll_down(view, g - idx - 1);
8641 		if (err)
8642 			return err;
8643 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8644 		    s->first_displayed_entry->idx + s->selected < g &&
8645 		    s->selected < s->ndisplayed - 1)
8646 			s->selected = g - s->first_displayed_entry->idx - 1;
8647 	} else if (idx + 1 > g)
8648 		ref_scroll_up(s, idx - g + 1);
8649 
8650 	if (g < nlines && s->first_displayed_entry->idx == 0)
8651 		s->selected = g - 1;
8652 
8653 	return NULL;
8654 
8655 }
8656 
8657 static const struct got_error *
8658 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8659 {
8660 	const struct got_error *err = NULL;
8661 	struct tog_ref_view_state *s = &view->state.ref;
8662 	struct tog_reflist_entry *re;
8663 	int n, nscroll = view->nlines - 1;
8664 
8665 	if (view->gline)
8666 		return ref_goto_line(view, nscroll);
8667 
8668 	switch (ch) {
8669 	case '0':
8670 	case '$':
8671 	case KEY_RIGHT:
8672 	case 'l':
8673 	case KEY_LEFT:
8674 	case 'h':
8675 		horizontal_scroll_input(view, ch);
8676 		break;
8677 	case 'i':
8678 		s->show_ids = !s->show_ids;
8679 		view->count = 0;
8680 		break;
8681 	case 'm':
8682 		s->show_date = !s->show_date;
8683 		view->count = 0;
8684 		break;
8685 	case 'o':
8686 		s->sort_by_date = !s->sort_by_date;
8687 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8688 		view->count = 0;
8689 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8690 		    got_ref_cmp_by_commit_timestamp_descending :
8691 		    tog_ref_cmp_by_name, s->repo);
8692 		if (err)
8693 			break;
8694 		got_reflist_object_id_map_free(tog_refs_idmap);
8695 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8696 		    &tog_refs, s->repo);
8697 		if (err)
8698 			break;
8699 		ref_view_free_refs(s);
8700 		err = ref_view_load_refs(s);
8701 		break;
8702 	case KEY_ENTER:
8703 	case '\r':
8704 		view->count = 0;
8705 		if (!s->selected_entry)
8706 			break;
8707 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8708 		break;
8709 	case 'T':
8710 		view->count = 0;
8711 		if (!s->selected_entry)
8712 			break;
8713 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8714 		break;
8715 	case 'g':
8716 	case '=':
8717 	case KEY_HOME:
8718 		s->selected = 0;
8719 		view->count = 0;
8720 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8721 		break;
8722 	case 'G':
8723 	case '*':
8724 	case KEY_END: {
8725 		int eos = view->nlines - 1;
8726 
8727 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8728 			--eos;  /* border */
8729 		s->selected = 0;
8730 		view->count = 0;
8731 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8732 		for (n = 0; n < eos; n++) {
8733 			if (re == NULL)
8734 				break;
8735 			s->first_displayed_entry = re;
8736 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8737 		}
8738 		if (n > 0)
8739 			s->selected = n - 1;
8740 		break;
8741 	}
8742 	case 'k':
8743 	case KEY_UP:
8744 	case CTRL('p'):
8745 		if (s->selected > 0) {
8746 			s->selected--;
8747 			break;
8748 		}
8749 		ref_scroll_up(s, 1);
8750 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8751 			view->count = 0;
8752 		break;
8753 	case CTRL('u'):
8754 	case 'u':
8755 		nscroll /= 2;
8756 		/* FALL THROUGH */
8757 	case KEY_PPAGE:
8758 	case CTRL('b'):
8759 	case 'b':
8760 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8761 			s->selected -= MIN(nscroll, s->selected);
8762 		ref_scroll_up(s, MAX(0, nscroll));
8763 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8764 			view->count = 0;
8765 		break;
8766 	case 'j':
8767 	case KEY_DOWN:
8768 	case CTRL('n'):
8769 		if (s->selected < s->ndisplayed - 1) {
8770 			s->selected++;
8771 			break;
8772 		}
8773 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8774 			/* can't scroll any further */
8775 			view->count = 0;
8776 			break;
8777 		}
8778 		ref_scroll_down(view, 1);
8779 		break;
8780 	case CTRL('d'):
8781 	case 'd':
8782 		nscroll /= 2;
8783 		/* FALL THROUGH */
8784 	case KEY_NPAGE:
8785 	case CTRL('f'):
8786 	case 'f':
8787 	case ' ':
8788 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8789 			/* can't scroll any further; move cursor down */
8790 			if (s->selected < s->ndisplayed - 1)
8791 				s->selected += MIN(nscroll,
8792 				    s->ndisplayed - s->selected - 1);
8793 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8794 				s->selected += s->ndisplayed - s->selected - 1;
8795 			view->count = 0;
8796 			break;
8797 		}
8798 		ref_scroll_down(view, nscroll);
8799 		break;
8800 	case CTRL('l'):
8801 		view->count = 0;
8802 		tog_free_refs();
8803 		err = tog_load_refs(s->repo, s->sort_by_date);
8804 		if (err)
8805 			break;
8806 		ref_view_free_refs(s);
8807 		err = ref_view_load_refs(s);
8808 		break;
8809 	case KEY_RESIZE:
8810 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8811 			s->selected = view->nlines - 2;
8812 		break;
8813 	default:
8814 		view->count = 0;
8815 		break;
8816 	}
8817 
8818 	return err;
8819 }
8820 
8821 __dead static void
8822 usage_ref(void)
8823 {
8824 	endwin();
8825 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8826 	    getprogname());
8827 	exit(1);
8828 }
8829 
8830 static const struct got_error *
8831 cmd_ref(int argc, char *argv[])
8832 {
8833 	const struct got_error *error;
8834 	struct got_repository *repo = NULL;
8835 	struct got_worktree *worktree = NULL;
8836 	char *cwd = NULL, *repo_path = NULL;
8837 	int ch;
8838 	struct tog_view *view;
8839 	int *pack_fds = NULL;
8840 
8841 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8842 		switch (ch) {
8843 		case 'r':
8844 			repo_path = realpath(optarg, NULL);
8845 			if (repo_path == NULL)
8846 				return got_error_from_errno2("realpath",
8847 				    optarg);
8848 			break;
8849 		default:
8850 			usage_ref();
8851 			/* NOTREACHED */
8852 		}
8853 	}
8854 
8855 	argc -= optind;
8856 	argv += optind;
8857 
8858 	if (argc > 1)
8859 		usage_ref();
8860 
8861 	error = got_repo_pack_fds_open(&pack_fds);
8862 	if (error != NULL)
8863 		goto done;
8864 
8865 	if (repo_path == NULL) {
8866 		cwd = getcwd(NULL, 0);
8867 		if (cwd == NULL)
8868 			return got_error_from_errno("getcwd");
8869 		error = got_worktree_open(&worktree, cwd);
8870 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8871 			goto done;
8872 		if (worktree)
8873 			repo_path =
8874 			    strdup(got_worktree_get_repo_path(worktree));
8875 		else
8876 			repo_path = strdup(cwd);
8877 		if (repo_path == NULL) {
8878 			error = got_error_from_errno("strdup");
8879 			goto done;
8880 		}
8881 	}
8882 
8883 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8884 	if (error != NULL)
8885 		goto done;
8886 
8887 	init_curses();
8888 
8889 	error = apply_unveil(got_repo_get_path(repo), NULL);
8890 	if (error)
8891 		goto done;
8892 
8893 	error = tog_load_refs(repo, 0);
8894 	if (error)
8895 		goto done;
8896 
8897 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8898 	if (view == NULL) {
8899 		error = got_error_from_errno("view_open");
8900 		goto done;
8901 	}
8902 
8903 	error = open_ref_view(view, repo);
8904 	if (error)
8905 		goto done;
8906 
8907 	if (worktree) {
8908 		/* Release work tree lock. */
8909 		got_worktree_close(worktree);
8910 		worktree = NULL;
8911 	}
8912 	error = view_loop(view);
8913 done:
8914 	free(repo_path);
8915 	free(cwd);
8916 	if (repo) {
8917 		const struct got_error *close_err = got_repo_close(repo);
8918 		if (close_err)
8919 			error = close_err;
8920 	}
8921 	if (pack_fds) {
8922 		const struct got_error *pack_err =
8923 		    got_repo_pack_fds_close(pack_fds);
8924 		if (error == NULL)
8925 			error = pack_err;
8926 	}
8927 	tog_free_refs();
8928 	return error;
8929 }
8930 
8931 static const struct got_error*
8932 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8933     const char *str)
8934 {
8935 	size_t len;
8936 
8937 	if (win == NULL)
8938 		win = stdscr;
8939 
8940 	len = strlen(str);
8941 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8942 
8943 	if (focus)
8944 		wstandout(win);
8945 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8946 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8947 	if (focus)
8948 		wstandend(win);
8949 
8950 	return NULL;
8951 }
8952 
8953 static const struct got_error *
8954 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8955 {
8956 	off_t *p;
8957 
8958 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8959 	if (p == NULL) {
8960 		free(*line_offsets);
8961 		*line_offsets = NULL;
8962 		return got_error_from_errno("reallocarray");
8963 	}
8964 
8965 	*line_offsets = p;
8966 	(*line_offsets)[*nlines] = off;
8967 	++(*nlines);
8968 	return NULL;
8969 }
8970 
8971 static const struct got_error *
8972 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8973 {
8974 	*ret = 0;
8975 
8976 	for (;n > 0; --n, ++km) {
8977 		char	*t0, *t, *k;
8978 		size_t	 len = 1;
8979 
8980 		if (km->keys == NULL)
8981 			continue;
8982 
8983 		t = t0 = strdup(km->keys);
8984 		if (t0 == NULL)
8985 			return got_error_from_errno("strdup");
8986 
8987 		len += strlen(t);
8988 		while ((k = strsep(&t, " ")) != NULL)
8989 			len += strlen(k) > 1 ? 2 : 0;
8990 		free(t0);
8991 		*ret = MAX(*ret, len);
8992 	}
8993 
8994 	return NULL;
8995 }
8996 
8997 /*
8998  * Write keymap section headers, keys, and key info in km to f.
8999  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9000  * wrap control and symbolic keys in guillemets, else use <>.
9001  */
9002 static const struct got_error *
9003 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9004 {
9005 	int n, len = width;
9006 
9007 	if (km->keys) {
9008 		static const char *u8_glyph[] = {
9009 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9010 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9011 		};
9012 		char	*t0, *t, *k;
9013 		int	 cs, s, first = 1;
9014 
9015 		cs = got_locale_is_utf8();
9016 
9017 		t = t0 = strdup(km->keys);
9018 		if (t0 == NULL)
9019 			return got_error_from_errno("strdup");
9020 
9021 		len = strlen(km->keys);
9022 		while ((k = strsep(&t, " ")) != NULL) {
9023 			s = strlen(k) > 1;  /* control or symbolic key */
9024 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9025 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9026 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9027 			if (n < 0) {
9028 				free(t0);
9029 				return got_error_from_errno("fprintf");
9030 			}
9031 			first = 0;
9032 			len += s ? 2 : 0;
9033 			*off += n;
9034 		}
9035 		free(t0);
9036 	}
9037 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9038 	if (n < 0)
9039 		return got_error_from_errno("fprintf");
9040 	*off += n;
9041 
9042 	return NULL;
9043 }
9044 
9045 static const struct got_error *
9046 format_help(struct tog_help_view_state *s)
9047 {
9048 	const struct got_error		*err = NULL;
9049 	off_t				 off = 0;
9050 	int				 i, max, n, show = s->all;
9051 	static const struct tog_key_map	 km[] = {
9052 #define KEYMAP_(info, type)	{ NULL, (info), type }
9053 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9054 		GENERATE_HELP
9055 #undef KEYMAP_
9056 #undef KEY_
9057 	};
9058 
9059 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9060 	if (err)
9061 		return err;
9062 
9063 	n = nitems(km);
9064 	err = max_key_str(&max, km, n);
9065 	if (err)
9066 		return err;
9067 
9068 	for (i = 0; i < n; ++i) {
9069 		if (km[i].keys == NULL) {
9070 			show = s->all;
9071 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9072 			    km[i].type == s->type || s->all)
9073 				show = 1;
9074 		}
9075 		if (show) {
9076 			err = format_help_line(&off, s->f, &km[i], max);
9077 			if (err)
9078 				return err;
9079 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9080 			if (err)
9081 				return err;
9082 		}
9083 	}
9084 	fputc('\n', s->f);
9085 	++off;
9086 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9087 	return err;
9088 }
9089 
9090 static const struct got_error *
9091 create_help(struct tog_help_view_state *s)
9092 {
9093 	FILE			*f;
9094 	const struct got_error	*err;
9095 
9096 	free(s->line_offsets);
9097 	s->line_offsets = NULL;
9098 	s->nlines = 0;
9099 
9100 	f = got_opentemp();
9101 	if (f == NULL)
9102 		return got_error_from_errno("got_opentemp");
9103 	s->f = f;
9104 
9105 	err = format_help(s);
9106 	if (err)
9107 		return err;
9108 
9109 	if (s->f && fflush(s->f) != 0)
9110 		return got_error_from_errno("fflush");
9111 
9112 	return NULL;
9113 }
9114 
9115 static const struct got_error *
9116 search_start_help_view(struct tog_view *view)
9117 {
9118 	view->state.help.matched_line = 0;
9119 	return NULL;
9120 }
9121 
9122 static void
9123 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9124     size_t *nlines, int **first, int **last, int **match, int **selected)
9125 {
9126 	struct tog_help_view_state *s = &view->state.help;
9127 
9128 	*f = s->f;
9129 	*nlines = s->nlines;
9130 	*line_offsets = s->line_offsets;
9131 	*match = &s->matched_line;
9132 	*first = &s->first_displayed_line;
9133 	*last = &s->last_displayed_line;
9134 	*selected = &s->selected_line;
9135 }
9136 
9137 static const struct got_error *
9138 show_help_view(struct tog_view *view)
9139 {
9140 	struct tog_help_view_state	*s = &view->state.help;
9141 	const struct got_error		*err;
9142 	regmatch_t			*regmatch = &view->regmatch;
9143 	wchar_t				*wline;
9144 	char				*line;
9145 	ssize_t				 linelen;
9146 	size_t				 linesz = 0;
9147 	int				 width, nprinted = 0, rc = 0;
9148 	int				 eos = view->nlines;
9149 
9150 	if (view_is_hsplit_top(view))
9151 		--eos;  /* account for border */
9152 
9153 	s->lineno = 0;
9154 	rewind(s->f);
9155 	werase(view->window);
9156 
9157 	if (view->gline > s->nlines - 1)
9158 		view->gline = s->nlines - 1;
9159 
9160 	err = win_draw_center(view->window, 0, 0, view->ncols,
9161 	    view_needs_focus_indication(view),
9162 	    "tog help (press q to return to tog)");
9163 	if (err)
9164 		return err;
9165 	if (eos <= 1)
9166 		return NULL;
9167 	waddstr(view->window, "\n\n");
9168 	eos -= 2;
9169 
9170 	s->eof = 0;
9171 	view->maxx = 0;
9172 	line = NULL;
9173 	while (eos > 0 && nprinted < eos) {
9174 		attr_t attr = 0;
9175 
9176 		linelen = getline(&line, &linesz, s->f);
9177 		if (linelen == -1) {
9178 			if (!feof(s->f)) {
9179 				free(line);
9180 				return got_ferror(s->f, GOT_ERR_IO);
9181 			}
9182 			s->eof = 1;
9183 			break;
9184 		}
9185 		if (++s->lineno < s->first_displayed_line)
9186 			continue;
9187 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9188 			continue;
9189 		if (s->lineno == view->hiline)
9190 			attr = A_STANDOUT;
9191 
9192 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9193 		    view->x ? 1 : 0);
9194 		if (err) {
9195 			free(line);
9196 			return err;
9197 		}
9198 		view->maxx = MAX(view->maxx, width);
9199 		free(wline);
9200 		wline = NULL;
9201 
9202 		if (attr)
9203 			wattron(view->window, attr);
9204 		if (s->first_displayed_line + nprinted == s->matched_line &&
9205 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9206 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9207 			    view->window, view->x, regmatch);
9208 			if (err) {
9209 				free(line);
9210 				return err;
9211 			}
9212 		} else {
9213 			int skip;
9214 
9215 			err = format_line(&wline, &width, &skip, line,
9216 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9217 			if (err) {
9218 				free(line);
9219 				return err;
9220 			}
9221 			waddwstr(view->window, &wline[skip]);
9222 			free(wline);
9223 			wline = NULL;
9224 		}
9225 		if (s->lineno == view->hiline) {
9226 			while (width++ < view->ncols)
9227 				waddch(view->window, ' ');
9228 		} else {
9229 			if (width < view->ncols)
9230 				waddch(view->window, '\n');
9231 		}
9232 		if (attr)
9233 			wattroff(view->window, attr);
9234 		if (++nprinted == 1)
9235 			s->first_displayed_line = s->lineno;
9236 	}
9237 	free(line);
9238 	if (nprinted > 0)
9239 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9240 	else
9241 		s->last_displayed_line = s->first_displayed_line;
9242 
9243 	view_border(view);
9244 
9245 	if (s->eof) {
9246 		rc = waddnstr(view->window,
9247 		    "See the tog(1) manual page for full documentation",
9248 		    view->ncols - 1);
9249 		if (rc == ERR)
9250 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9251 	} else {
9252 		wmove(view->window, view->nlines - 1, 0);
9253 		wclrtoeol(view->window);
9254 		wstandout(view->window);
9255 		rc = waddnstr(view->window, "scroll down for more...",
9256 		    view->ncols - 1);
9257 		if (rc == ERR)
9258 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9259 		if (getcurx(view->window) < view->ncols - 6) {
9260 			rc = wprintw(view->window, "[%.0f%%]",
9261 			    100.00 * s->last_displayed_line / s->nlines);
9262 			if (rc == ERR)
9263 				return got_error_msg(GOT_ERR_IO, "wprintw");
9264 		}
9265 		wstandend(view->window);
9266 	}
9267 
9268 	return NULL;
9269 }
9270 
9271 static const struct got_error *
9272 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9273 {
9274 	struct tog_help_view_state	*s = &view->state.help;
9275 	const struct got_error		*err = NULL;
9276 	char				*line = NULL;
9277 	ssize_t				 linelen;
9278 	size_t				 linesz = 0;
9279 	int				 eos, nscroll;
9280 
9281 	eos = nscroll = view->nlines;
9282 	if (view_is_hsplit_top(view))
9283 		--eos;  /* border */
9284 
9285 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9286 
9287 	switch (ch) {
9288 	case '0':
9289 	case '$':
9290 	case KEY_RIGHT:
9291 	case 'l':
9292 	case KEY_LEFT:
9293 	case 'h':
9294 		horizontal_scroll_input(view, ch);
9295 		break;
9296 	case 'g':
9297 	case KEY_HOME:
9298 		s->first_displayed_line = 1;
9299 		view->count = 0;
9300 		break;
9301 	case 'G':
9302 	case KEY_END:
9303 		view->count = 0;
9304 		if (s->eof)
9305 			break;
9306 		s->first_displayed_line = (s->nlines - eos) + 3;
9307 		s->eof = 1;
9308 		break;
9309 	case 'k':
9310 	case KEY_UP:
9311 		if (s->first_displayed_line > 1)
9312 			--s->first_displayed_line;
9313 		else
9314 			view->count = 0;
9315 		break;
9316 	case CTRL('u'):
9317 	case 'u':
9318 		nscroll /= 2;
9319 		/* FALL THROUGH */
9320 	case KEY_PPAGE:
9321 	case CTRL('b'):
9322 	case 'b':
9323 		if (s->first_displayed_line == 1) {
9324 			view->count = 0;
9325 			break;
9326 		}
9327 		while (--nscroll > 0 && s->first_displayed_line > 1)
9328 			s->first_displayed_line--;
9329 		break;
9330 	case 'j':
9331 	case KEY_DOWN:
9332 	case CTRL('n'):
9333 		if (!s->eof)
9334 			++s->first_displayed_line;
9335 		else
9336 			view->count = 0;
9337 		break;
9338 	case CTRL('d'):
9339 	case 'd':
9340 		nscroll /= 2;
9341 		/* FALL THROUGH */
9342 	case KEY_NPAGE:
9343 	case CTRL('f'):
9344 	case 'f':
9345 	case ' ':
9346 		if (s->eof) {
9347 			view->count = 0;
9348 			break;
9349 		}
9350 		while (!s->eof && --nscroll > 0) {
9351 			linelen = getline(&line, &linesz, s->f);
9352 			s->first_displayed_line++;
9353 			if (linelen == -1) {
9354 				if (feof(s->f))
9355 					s->eof = 1;
9356 				else
9357 					err = got_ferror(s->f, GOT_ERR_IO);
9358 				break;
9359 			}
9360 		}
9361 		free(line);
9362 		break;
9363 	default:
9364 		view->count = 0;
9365 		break;
9366 	}
9367 
9368 	return err;
9369 }
9370 
9371 static const struct got_error *
9372 close_help_view(struct tog_view *view)
9373 {
9374 	struct tog_help_view_state *s = &view->state.help;
9375 
9376 	free(s->line_offsets);
9377 	s->line_offsets = NULL;
9378 	if (fclose(s->f) == EOF)
9379 		return got_error_from_errno("fclose");
9380 
9381 	return NULL;
9382 }
9383 
9384 static const struct got_error *
9385 reset_help_view(struct tog_view *view)
9386 {
9387 	struct tog_help_view_state *s = &view->state.help;
9388 
9389 
9390 	if (s->f && fclose(s->f) == EOF)
9391 		return got_error_from_errno("fclose");
9392 
9393 	wclear(view->window);
9394 	view->count = 0;
9395 	view->x = 0;
9396 	s->all = !s->all;
9397 	s->first_displayed_line = 1;
9398 	s->last_displayed_line = view->nlines;
9399 	s->matched_line = 0;
9400 
9401 	return create_help(s);
9402 }
9403 
9404 static const struct got_error *
9405 open_help_view(struct tog_view *view, struct tog_view *parent)
9406 {
9407 	const struct got_error		*err = NULL;
9408 	struct tog_help_view_state	*s = &view->state.help;
9409 
9410 	s->type = (enum tog_keymap_type)parent->type;
9411 	s->first_displayed_line = 1;
9412 	s->last_displayed_line = view->nlines;
9413 	s->selected_line = 1;
9414 
9415 	view->show = show_help_view;
9416 	view->input = input_help_view;
9417 	view->reset = reset_help_view;
9418 	view->close = close_help_view;
9419 	view->search_start = search_start_help_view;
9420 	view->search_setup = search_setup_help_view;
9421 	view->search_next = search_next_view_match;
9422 
9423 	err = create_help(s);
9424 	return err;
9425 }
9426 
9427 static const struct got_error *
9428 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9429     enum tog_view_type request, int y, int x)
9430 {
9431 	const struct got_error *err = NULL;
9432 
9433 	*new_view = NULL;
9434 
9435 	switch (request) {
9436 	case TOG_VIEW_DIFF:
9437 		if (view->type == TOG_VIEW_LOG) {
9438 			struct tog_log_view_state *s = &view->state.log;
9439 
9440 			err = open_diff_view_for_commit(new_view, y, x,
9441 			    s->selected_entry->commit, s->selected_entry->id,
9442 			    view, s->repo);
9443 		} else
9444 			return got_error_msg(GOT_ERR_NOT_IMPL,
9445 			    "parent/child view pair not supported");
9446 		break;
9447 	case TOG_VIEW_BLAME:
9448 		if (view->type == TOG_VIEW_TREE) {
9449 			struct tog_tree_view_state *s = &view->state.tree;
9450 
9451 			err = blame_tree_entry(new_view, y, x,
9452 			    s->selected_entry, &s->parents, s->commit_id,
9453 			    s->repo);
9454 		} else
9455 			return got_error_msg(GOT_ERR_NOT_IMPL,
9456 			    "parent/child view pair not supported");
9457 		break;
9458 	case TOG_VIEW_LOG:
9459 		if (view->type == TOG_VIEW_BLAME)
9460 			err = log_annotated_line(new_view, y, x,
9461 			    view->state.blame.repo, view->state.blame.id_to_log);
9462 		else if (view->type == TOG_VIEW_TREE)
9463 			err = log_selected_tree_entry(new_view, y, x,
9464 			    &view->state.tree);
9465 		else if (view->type == TOG_VIEW_REF)
9466 			err = log_ref_entry(new_view, y, x,
9467 			    view->state.ref.selected_entry,
9468 			    view->state.ref.repo);
9469 		else
9470 			return got_error_msg(GOT_ERR_NOT_IMPL,
9471 			    "parent/child view pair not supported");
9472 		break;
9473 	case TOG_VIEW_TREE:
9474 		if (view->type == TOG_VIEW_LOG)
9475 			err = browse_commit_tree(new_view, y, x,
9476 			    view->state.log.selected_entry,
9477 			    view->state.log.in_repo_path,
9478 			    view->state.log.head_ref_name,
9479 			    view->state.log.repo);
9480 		else if (view->type == TOG_VIEW_REF)
9481 			err = browse_ref_tree(new_view, y, x,
9482 			    view->state.ref.selected_entry,
9483 			    view->state.ref.repo);
9484 		else
9485 			return got_error_msg(GOT_ERR_NOT_IMPL,
9486 			    "parent/child view pair not supported");
9487 		break;
9488 	case TOG_VIEW_REF:
9489 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9490 		if (*new_view == NULL)
9491 			return got_error_from_errno("view_open");
9492 		if (view->type == TOG_VIEW_LOG)
9493 			err = open_ref_view(*new_view, view->state.log.repo);
9494 		else if (view->type == TOG_VIEW_TREE)
9495 			err = open_ref_view(*new_view, view->state.tree.repo);
9496 		else
9497 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9498 			    "parent/child view pair not supported");
9499 		if (err)
9500 			view_close(*new_view);
9501 		break;
9502 	case TOG_VIEW_HELP:
9503 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9504 		if (*new_view == NULL)
9505 			return got_error_from_errno("view_open");
9506 		err = open_help_view(*new_view, view);
9507 		if (err)
9508 			view_close(*new_view);
9509 		break;
9510 	default:
9511 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9512 	}
9513 
9514 	return err;
9515 }
9516 
9517 /*
9518  * If view was scrolled down to move the selected line into view when opening a
9519  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9520  */
9521 static void
9522 offset_selection_up(struct tog_view *view)
9523 {
9524 	switch (view->type) {
9525 	case TOG_VIEW_BLAME: {
9526 		struct tog_blame_view_state *s = &view->state.blame;
9527 		if (s->first_displayed_line == 1) {
9528 			s->selected_line = MAX(s->selected_line - view->offset,
9529 			    1);
9530 			break;
9531 		}
9532 		if (s->first_displayed_line > view->offset)
9533 			s->first_displayed_line -= view->offset;
9534 		else
9535 			s->first_displayed_line = 1;
9536 		s->selected_line += view->offset;
9537 		break;
9538 	}
9539 	case TOG_VIEW_LOG:
9540 		log_scroll_up(&view->state.log, view->offset);
9541 		view->state.log.selected += view->offset;
9542 		break;
9543 	case TOG_VIEW_REF:
9544 		ref_scroll_up(&view->state.ref, view->offset);
9545 		view->state.ref.selected += view->offset;
9546 		break;
9547 	case TOG_VIEW_TREE:
9548 		tree_scroll_up(&view->state.tree, view->offset);
9549 		view->state.tree.selected += view->offset;
9550 		break;
9551 	default:
9552 		break;
9553 	}
9554 
9555 	view->offset = 0;
9556 }
9557 
9558 /*
9559  * If the selected line is in the section of screen covered by the bottom split,
9560  * scroll down offset lines to move it into view and index its new position.
9561  */
9562 static const struct got_error *
9563 offset_selection_down(struct tog_view *view)
9564 {
9565 	const struct got_error	*err = NULL;
9566 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9567 	int			*selected = NULL;
9568 	int			 header, offset;
9569 
9570 	switch (view->type) {
9571 	case TOG_VIEW_BLAME: {
9572 		struct tog_blame_view_state *s = &view->state.blame;
9573 		header = 3;
9574 		scrolld = NULL;
9575 		if (s->selected_line > view->nlines - header) {
9576 			offset = abs(view->nlines - s->selected_line - header);
9577 			s->first_displayed_line += offset;
9578 			s->selected_line -= offset;
9579 			view->offset = offset;
9580 		}
9581 		break;
9582 	}
9583 	case TOG_VIEW_LOG: {
9584 		struct tog_log_view_state *s = &view->state.log;
9585 		scrolld = &log_scroll_down;
9586 		header = view_is_parent_view(view) ? 3 : 2;
9587 		selected = &s->selected;
9588 		break;
9589 	}
9590 	case TOG_VIEW_REF: {
9591 		struct tog_ref_view_state *s = &view->state.ref;
9592 		scrolld = &ref_scroll_down;
9593 		header = 3;
9594 		selected = &s->selected;
9595 		break;
9596 	}
9597 	case TOG_VIEW_TREE: {
9598 		struct tog_tree_view_state *s = &view->state.tree;
9599 		scrolld = &tree_scroll_down;
9600 		header = 5;
9601 		selected = &s->selected;
9602 		break;
9603 	}
9604 	default:
9605 		selected = NULL;
9606 		scrolld = NULL;
9607 		header = 0;
9608 		break;
9609 	}
9610 
9611 	if (selected && *selected > view->nlines - header) {
9612 		offset = abs(view->nlines - *selected - header);
9613 		view->offset = offset;
9614 		if (scrolld && offset) {
9615 			err = scrolld(view, offset);
9616 			*selected -= offset;
9617 		}
9618 	}
9619 
9620 	return err;
9621 }
9622 
9623 static void
9624 list_commands(FILE *fp)
9625 {
9626 	size_t i;
9627 
9628 	fprintf(fp, "commands:");
9629 	for (i = 0; i < nitems(tog_commands); i++) {
9630 		const struct tog_cmd *cmd = &tog_commands[i];
9631 		fprintf(fp, " %s", cmd->name);
9632 	}
9633 	fputc('\n', fp);
9634 }
9635 
9636 __dead static void
9637 usage(int hflag, int status)
9638 {
9639 	FILE *fp = (status == 0) ? stdout : stderr;
9640 
9641 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9642 	    getprogname());
9643 	if (hflag) {
9644 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9645 		list_commands(fp);
9646 	}
9647 	exit(status);
9648 }
9649 
9650 static char **
9651 make_argv(int argc, ...)
9652 {
9653 	va_list ap;
9654 	char **argv;
9655 	int i;
9656 
9657 	va_start(ap, argc);
9658 
9659 	argv = calloc(argc, sizeof(char *));
9660 	if (argv == NULL)
9661 		err(1, "calloc");
9662 	for (i = 0; i < argc; i++) {
9663 		argv[i] = strdup(va_arg(ap, char *));
9664 		if (argv[i] == NULL)
9665 			err(1, "strdup");
9666 	}
9667 
9668 	va_end(ap);
9669 	return argv;
9670 }
9671 
9672 /*
9673  * Try to convert 'tog path' into a 'tog log path' command.
9674  * The user could simply have mistyped the command rather than knowingly
9675  * provided a path. So check whether argv[0] can in fact be resolved
9676  * to a path in the HEAD commit and print a special error if not.
9677  * This hack is for mpi@ <3
9678  */
9679 static const struct got_error *
9680 tog_log_with_path(int argc, char *argv[])
9681 {
9682 	const struct got_error *error = NULL, *close_err;
9683 	const struct tog_cmd *cmd = NULL;
9684 	struct got_repository *repo = NULL;
9685 	struct got_worktree *worktree = NULL;
9686 	struct got_object_id *commit_id = NULL, *id = NULL;
9687 	struct got_commit_object *commit = NULL;
9688 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9689 	char *commit_id_str = NULL, **cmd_argv = NULL;
9690 	int *pack_fds = NULL;
9691 
9692 	cwd = getcwd(NULL, 0);
9693 	if (cwd == NULL)
9694 		return got_error_from_errno("getcwd");
9695 
9696 	error = got_repo_pack_fds_open(&pack_fds);
9697 	if (error != NULL)
9698 		goto done;
9699 
9700 	error = got_worktree_open(&worktree, cwd);
9701 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9702 		goto done;
9703 
9704 	if (worktree)
9705 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9706 	else
9707 		repo_path = strdup(cwd);
9708 	if (repo_path == NULL) {
9709 		error = got_error_from_errno("strdup");
9710 		goto done;
9711 	}
9712 
9713 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9714 	if (error != NULL)
9715 		goto done;
9716 
9717 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9718 	    repo, worktree);
9719 	if (error)
9720 		goto done;
9721 
9722 	error = tog_load_refs(repo, 0);
9723 	if (error)
9724 		goto done;
9725 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9726 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9727 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9728 	if (error)
9729 		goto done;
9730 
9731 	if (worktree) {
9732 		got_worktree_close(worktree);
9733 		worktree = NULL;
9734 	}
9735 
9736 	error = got_object_open_as_commit(&commit, repo, commit_id);
9737 	if (error)
9738 		goto done;
9739 
9740 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9741 	if (error) {
9742 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9743 			goto done;
9744 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9745 		    getprogname(), argv[0]);
9746 		usage(1, 1);
9747 		/* not reached */
9748 	}
9749 
9750 	error = got_object_id_str(&commit_id_str, commit_id);
9751 	if (error)
9752 		goto done;
9753 
9754 	cmd = &tog_commands[0]; /* log */
9755 	argc = 4;
9756 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9757 	error = cmd->cmd_main(argc, cmd_argv);
9758 done:
9759 	if (repo) {
9760 		close_err = got_repo_close(repo);
9761 		if (error == NULL)
9762 			error = close_err;
9763 	}
9764 	if (commit)
9765 		got_object_commit_close(commit);
9766 	if (worktree)
9767 		got_worktree_close(worktree);
9768 	if (pack_fds) {
9769 		const struct got_error *pack_err =
9770 		    got_repo_pack_fds_close(pack_fds);
9771 		if (error == NULL)
9772 			error = pack_err;
9773 	}
9774 	free(id);
9775 	free(commit_id_str);
9776 	free(commit_id);
9777 	free(cwd);
9778 	free(repo_path);
9779 	free(in_repo_path);
9780 	if (cmd_argv) {
9781 		int i;
9782 		for (i = 0; i < argc; i++)
9783 			free(cmd_argv[i]);
9784 		free(cmd_argv);
9785 	}
9786 	tog_free_refs();
9787 	return error;
9788 }
9789 
9790 int
9791 main(int argc, char *argv[])
9792 {
9793 	const struct got_error *io_err, *error = NULL;
9794 	const struct tog_cmd *cmd = NULL;
9795 	int ch, hflag = 0, Vflag = 0;
9796 	char **cmd_argv = NULL;
9797 	static const struct option longopts[] = {
9798 	    { "version", no_argument, NULL, 'V' },
9799 	    { NULL, 0, NULL, 0}
9800 	};
9801 	char *diff_algo_str = NULL;
9802 	const char *test_script_path;
9803 
9804 	setlocale(LC_CTYPE, "");
9805 
9806 	/*
9807 	 * Test mode init must happen before pledge() because "tty" will
9808 	 * not allow TTY-related ioctls to occur via regular files.
9809 	 */
9810 	test_script_path = getenv("TOG_TEST_SCRIPT");
9811 	if (test_script_path != NULL) {
9812 		error = init_mock_term(test_script_path);
9813 		if (error) {
9814 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9815 			return 1;
9816 		}
9817 	} else if (!isatty(STDIN_FILENO))
9818 		errx(1, "standard input is not a tty");
9819 
9820 #if !defined(PROFILE)
9821 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9822 	    NULL) == -1)
9823 		err(1, "pledge");
9824 #endif
9825 
9826 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9827 		switch (ch) {
9828 		case 'h':
9829 			hflag = 1;
9830 			break;
9831 		case 'V':
9832 			Vflag = 1;
9833 			break;
9834 		default:
9835 			usage(hflag, 1);
9836 			/* NOTREACHED */
9837 		}
9838 	}
9839 
9840 	argc -= optind;
9841 	argv += optind;
9842 	optind = 1;
9843 	optreset = 1;
9844 
9845 	if (Vflag) {
9846 		got_version_print_str();
9847 		return 0;
9848 	}
9849 
9850 	if (argc == 0) {
9851 		if (hflag)
9852 			usage(hflag, 0);
9853 		/* Build an argument vector which runs a default command. */
9854 		cmd = &tog_commands[0];
9855 		argc = 1;
9856 		cmd_argv = make_argv(argc, cmd->name);
9857 	} else {
9858 		size_t i;
9859 
9860 		/* Did the user specify a command? */
9861 		for (i = 0; i < nitems(tog_commands); i++) {
9862 			if (strncmp(tog_commands[i].name, argv[0],
9863 			    strlen(argv[0])) == 0) {
9864 				cmd = &tog_commands[i];
9865 				break;
9866 			}
9867 		}
9868 	}
9869 
9870 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9871 	if (diff_algo_str) {
9872 		if (strcasecmp(diff_algo_str, "patience") == 0)
9873 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9874 		if (strcasecmp(diff_algo_str, "myers") == 0)
9875 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9876 	}
9877 
9878 	if (cmd == NULL) {
9879 		if (argc != 1)
9880 			usage(0, 1);
9881 		/* No command specified; try log with a path */
9882 		error = tog_log_with_path(argc, argv);
9883 	} else {
9884 		if (hflag)
9885 			cmd->cmd_usage();
9886 		else
9887 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9888 	}
9889 
9890 	if (using_mock_io) {
9891 		io_err = tog_io_close();
9892 		if (error == NULL)
9893 			error = io_err;
9894 	}
9895 	endwin();
9896 	if (cmd_argv) {
9897 		int i;
9898 		for (i = 0; i < argc; i++)
9899 			free(cmd_argv[i]);
9900 		free(cmd_argv);
9901 	}
9902 
9903 	if (error && error->code != GOT_ERR_CANCELLED &&
9904 	    error->code != GOT_ERR_EOF &&
9905 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9906 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9907 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9908 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9909 	return 0;
9910 }