1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 
60 #ifndef MIN
61 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 #endif
63 
64 #ifndef MAX
65 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
66 #endif
67 
68 #define CTRL(x)		((x) & 0x1f)
69 
70 #ifndef nitems
71 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
72 #endif
73 
74 struct tog_cmd {
75 	const char *name;
76 	const struct got_error *(*cmd_main)(int, char *[]);
77 	void (*cmd_usage)(void);
78 };
79 
80 __dead static void	usage(int, int);
81 __dead static void	usage_log(void);
82 __dead static void	usage_diff(void);
83 __dead static void	usage_blame(void);
84 __dead static void	usage_tree(void);
85 __dead static void	usage_ref(void);
86 
87 static const struct got_error*	cmd_log(int, char *[]);
88 static const struct got_error*	cmd_diff(int, char *[]);
89 static const struct got_error*	cmd_blame(int, char *[]);
90 static const struct got_error*	cmd_tree(int, char *[]);
91 static const struct got_error*	cmd_ref(int, char *[]);
92 
93 static const struct tog_cmd tog_commands[] = {
94 	{ "log",	cmd_log,	usage_log },
95 	{ "diff",	cmd_diff,	usage_diff },
96 	{ "blame",	cmd_blame,	usage_blame },
97 	{ "tree",	cmd_tree,	usage_tree },
98 	{ "ref",	cmd_ref,	usage_ref },
99 };
100 
101 enum tog_view_type {
102 	TOG_VIEW_DIFF,
103 	TOG_VIEW_LOG,
104 	TOG_VIEW_BLAME,
105 	TOG_VIEW_TREE,
106 	TOG_VIEW_REF,
107 	TOG_VIEW_HELP
108 };
109 
110 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
111 enum tog_keymap_type {
112 	TOG_KEYMAP_KEYS = -2,
113 	TOG_KEYMAP_GLOBAL,
114 	TOG_KEYMAP_DIFF,
115 	TOG_KEYMAP_LOG,
116 	TOG_KEYMAP_BLAME,
117 	TOG_KEYMAP_TREE,
118 	TOG_KEYMAP_REF,
119 	TOG_KEYMAP_HELP
120 };
121 
122 enum tog_view_mode {
123 	TOG_VIEW_SPLIT_NONE,
124 	TOG_VIEW_SPLIT_VERT,
125 	TOG_VIEW_SPLIT_HRZN
126 };
127 
128 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
129 
130 #define TOG_EOF_STRING	"(END)"
131 
132 struct commit_queue_entry {
133 	TAILQ_ENTRY(commit_queue_entry) entry;
134 	struct got_object_id *id;
135 	struct got_commit_object *commit;
136 	int idx;
137 };
138 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
139 struct commit_queue {
140 	int ncommits;
141 	struct commit_queue_head head;
142 };
143 
144 struct tog_color {
145 	STAILQ_ENTRY(tog_color) entry;
146 	regex_t regex;
147 	short colorpair;
148 };
149 STAILQ_HEAD(tog_colors, tog_color);
150 
151 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
152 static struct got_reflist_object_id_map *tog_refs_idmap;
153 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
154 
155 static const struct got_error *
156 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
157     struct got_reference* re2)
158 {
159 	const char *name1 = got_ref_get_name(re1);
160 	const char *name2 = got_ref_get_name(re2);
161 	int isbackup1, isbackup2;
162 
163 	/* Sort backup refs towards the bottom of the list. */
164 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
165 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
166 	if (!isbackup1 && isbackup2) {
167 		*cmp = -1;
168 		return NULL;
169 	} else if (isbackup1 && !isbackup2) {
170 		*cmp = 1;
171 		return NULL;
172 	}
173 
174 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
175 	return NULL;
176 }
177 
178 static const struct got_error *
179 tog_load_refs(struct got_repository *repo, int sort_by_date)
180 {
181 	const struct got_error *err;
182 
183 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
184 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
185 	    repo);
186 	if (err)
187 		return err;
188 
189 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
190 	    repo);
191 }
192 
193 static void
194 tog_free_refs(void)
195 {
196 	if (tog_refs_idmap) {
197 		got_reflist_object_id_map_free(tog_refs_idmap);
198 		tog_refs_idmap = NULL;
199 	}
200 	got_ref_list_free(&tog_refs);
201 }
202 
203 static const struct got_error *
204 add_color(struct tog_colors *colors, const char *pattern,
205     int idx, short color)
206 {
207 	const struct got_error *err = NULL;
208 	struct tog_color *tc;
209 	int regerr = 0;
210 
211 	if (idx < 1 || idx > COLOR_PAIRS - 1)
212 		return NULL;
213 
214 	init_pair(idx, color, -1);
215 
216 	tc = calloc(1, sizeof(*tc));
217 	if (tc == NULL)
218 		return got_error_from_errno("calloc");
219 	regerr = regcomp(&tc->regex, pattern,
220 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
221 	if (regerr) {
222 		static char regerr_msg[512];
223 		static char err_msg[512];
224 		regerror(regerr, &tc->regex, regerr_msg,
225 		    sizeof(regerr_msg));
226 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
227 		    regerr_msg);
228 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
229 		free(tc);
230 		return err;
231 	}
232 	tc->colorpair = idx;
233 	STAILQ_INSERT_HEAD(colors, tc, entry);
234 	return NULL;
235 }
236 
237 static void
238 free_colors(struct tog_colors *colors)
239 {
240 	struct tog_color *tc;
241 
242 	while (!STAILQ_EMPTY(colors)) {
243 		tc = STAILQ_FIRST(colors);
244 		STAILQ_REMOVE_HEAD(colors, entry);
245 		regfree(&tc->regex);
246 		free(tc);
247 	}
248 }
249 
250 static struct tog_color *
251 get_color(struct tog_colors *colors, int colorpair)
252 {
253 	struct tog_color *tc = NULL;
254 
255 	STAILQ_FOREACH(tc, colors, entry) {
256 		if (tc->colorpair == colorpair)
257 			return tc;
258 	}
259 
260 	return NULL;
261 }
262 
263 static int
264 default_color_value(const char *envvar)
265 {
266 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
271 		return COLOR_YELLOW;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
275 		return COLOR_MAGENTA;
276 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
281 		return COLOR_GREEN;
282 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
287 		return COLOR_YELLOW;
288 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
291 		return COLOR_MAGENTA;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
295 		return COLOR_CYAN;
296 
297 	return -1;
298 }
299 
300 static int
301 get_color_value(const char *envvar)
302 {
303 	const char *val = getenv(envvar);
304 
305 	if (val == NULL)
306 		return default_color_value(envvar);
307 
308 	if (strcasecmp(val, "black") == 0)
309 		return COLOR_BLACK;
310 	if (strcasecmp(val, "red") == 0)
311 		return COLOR_RED;
312 	if (strcasecmp(val, "green") == 0)
313 		return COLOR_GREEN;
314 	if (strcasecmp(val, "yellow") == 0)
315 		return COLOR_YELLOW;
316 	if (strcasecmp(val, "blue") == 0)
317 		return COLOR_BLUE;
318 	if (strcasecmp(val, "magenta") == 0)
319 		return COLOR_MAGENTA;
320 	if (strcasecmp(val, "cyan") == 0)
321 		return COLOR_CYAN;
322 	if (strcasecmp(val, "white") == 0)
323 		return COLOR_WHITE;
324 	if (strcasecmp(val, "default") == 0)
325 		return -1;
326 
327 	return default_color_value(envvar);
328 }
329 
330 struct tog_diff_view_state {
331 	struct got_object_id *id1, *id2;
332 	const char *label1, *label2;
333 	FILE *f, *f1, *f2;
334 	int fd1, fd2;
335 	int lineno;
336 	int first_displayed_line;
337 	int last_displayed_line;
338 	int eof;
339 	int diff_context;
340 	int ignore_whitespace;
341 	int force_text_diff;
342 	struct got_repository *repo;
343 	struct got_diff_line *lines;
344 	size_t nlines;
345 	int matched_line;
346 	int selected_line;
347 
348 	/* passed from log or blame view; may be NULL */
349 	struct tog_view *parent_view;
350 };
351 
352 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
353 static volatile sig_atomic_t tog_thread_error;
354 
355 struct tog_log_thread_args {
356 	pthread_cond_t need_commits;
357 	pthread_cond_t commit_loaded;
358 	int commits_needed;
359 	int load_all;
360 	struct got_commit_graph *graph;
361 	struct commit_queue *real_commits;
362 	const char *in_repo_path;
363 	struct got_object_id *start_id;
364 	struct got_repository *repo;
365 	int *pack_fds;
366 	int log_complete;
367 	sig_atomic_t *quit;
368 	struct commit_queue_entry **first_displayed_entry;
369 	struct commit_queue_entry **selected_entry;
370 	int *searching;
371 	int *search_next_done;
372 	regex_t *regex;
373 	int *limiting;
374 	int limit_match;
375 	regex_t *limit_regex;
376 	struct commit_queue *limit_commits;
377 };
378 
379 struct tog_log_view_state {
380 	struct commit_queue *commits;
381 	struct commit_queue_entry *first_displayed_entry;
382 	struct commit_queue_entry *last_displayed_entry;
383 	struct commit_queue_entry *selected_entry;
384 	struct commit_queue real_commits;
385 	int selected;
386 	char *in_repo_path;
387 	char *head_ref_name;
388 	int log_branches;
389 	struct got_repository *repo;
390 	struct got_object_id *start_id;
391 	sig_atomic_t quit;
392 	pthread_t thread;
393 	struct tog_log_thread_args thread_args;
394 	struct commit_queue_entry *matched_entry;
395 	struct commit_queue_entry *search_entry;
396 	struct tog_colors colors;
397 	int use_committer;
398 	int limit_view;
399 	regex_t limit_regex;
400 	struct commit_queue limit_commits;
401 };
402 
403 #define TOG_COLOR_DIFF_MINUS		1
404 #define TOG_COLOR_DIFF_PLUS		2
405 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
406 #define TOG_COLOR_DIFF_META		4
407 #define TOG_COLOR_TREE_SUBMODULE	5
408 #define TOG_COLOR_TREE_SYMLINK		6
409 #define TOG_COLOR_TREE_DIRECTORY	7
410 #define TOG_COLOR_TREE_EXECUTABLE	8
411 #define TOG_COLOR_COMMIT		9
412 #define TOG_COLOR_AUTHOR		10
413 #define TOG_COLOR_DATE			11
414 #define TOG_COLOR_REFS_HEADS		12
415 #define TOG_COLOR_REFS_TAGS		13
416 #define TOG_COLOR_REFS_REMOTES		14
417 #define TOG_COLOR_REFS_BACKUP		15
418 
419 struct tog_blame_cb_args {
420 	struct tog_blame_line *lines; /* one per line */
421 	int nlines;
422 
423 	struct tog_view *view;
424 	struct got_object_id *commit_id;
425 	int *quit;
426 };
427 
428 struct tog_blame_thread_args {
429 	const char *path;
430 	struct got_repository *repo;
431 	struct tog_blame_cb_args *cb_args;
432 	int *complete;
433 	got_cancel_cb cancel_cb;
434 	void *cancel_arg;
435 };
436 
437 struct tog_blame {
438 	FILE *f;
439 	off_t filesize;
440 	struct tog_blame_line *lines;
441 	int nlines;
442 	off_t *line_offsets;
443 	pthread_t thread;
444 	struct tog_blame_thread_args thread_args;
445 	struct tog_blame_cb_args cb_args;
446 	const char *path;
447 	int *pack_fds;
448 };
449 
450 struct tog_blame_view_state {
451 	int first_displayed_line;
452 	int last_displayed_line;
453 	int selected_line;
454 	int last_diffed_line;
455 	int blame_complete;
456 	int eof;
457 	int done;
458 	struct got_object_id_queue blamed_commits;
459 	struct got_object_qid *blamed_commit;
460 	char *path;
461 	struct got_repository *repo;
462 	struct got_object_id *commit_id;
463 	struct got_object_id *id_to_log;
464 	struct tog_blame blame;
465 	int matched_line;
466 	struct tog_colors colors;
467 };
468 
469 struct tog_parent_tree {
470 	TAILQ_ENTRY(tog_parent_tree) entry;
471 	struct got_tree_object *tree;
472 	struct got_tree_entry *first_displayed_entry;
473 	struct got_tree_entry *selected_entry;
474 	int selected;
475 };
476 
477 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
478 
479 struct tog_tree_view_state {
480 	char *tree_label;
481 	struct got_object_id *commit_id;/* commit which this tree belongs to */
482 	struct got_tree_object *root;	/* the commit's root tree entry */
483 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
484 	struct got_tree_entry *first_displayed_entry;
485 	struct got_tree_entry *last_displayed_entry;
486 	struct got_tree_entry *selected_entry;
487 	int ndisplayed, selected, show_ids;
488 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
489 	char *head_ref_name;
490 	struct got_repository *repo;
491 	struct got_tree_entry *matched_entry;
492 	struct tog_colors colors;
493 };
494 
495 struct tog_reflist_entry {
496 	TAILQ_ENTRY(tog_reflist_entry) entry;
497 	struct got_reference *ref;
498 	int idx;
499 };
500 
501 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
502 
503 struct tog_ref_view_state {
504 	struct tog_reflist_head refs;
505 	struct tog_reflist_entry *first_displayed_entry;
506 	struct tog_reflist_entry *last_displayed_entry;
507 	struct tog_reflist_entry *selected_entry;
508 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
509 	struct got_repository *repo;
510 	struct tog_reflist_entry *matched_entry;
511 	struct tog_colors colors;
512 };
513 
514 struct tog_help_view_state {
515 	FILE			*f;
516 	off_t			*line_offsets;
517 	size_t			 nlines;
518 	int			 lineno;
519 	int			 first_displayed_line;
520 	int			 last_displayed_line;
521 	int			 eof;
522 	int			 matched_line;
523 	int			 selected_line;
524 	int			 all;
525 	enum tog_keymap_type	 type;
526 };
527 
528 #define GENERATE_HELP \
529 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
530 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
531 	KEY_("k C-p Up", "Move cursor or page up one line"), \
532 	KEY_("j C-n Down", "Move cursor or page down one line"), \
533 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
534 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
535 	KEY_("C-u u", "Scroll the view up one half page"), \
536 	KEY_("C-d d", "Scroll the view down one half page"), \
537 	KEY_("g", "Go to line N (default: first line)"), \
538 	KEY_("Home =", "Go to the first line"), \
539 	KEY_("G", "Go to line N (default: last line)"), \
540 	KEY_("End *", "Go to the last line"), \
541 	KEY_("l Right", "Scroll the view right"), \
542 	KEY_("h Left", "Scroll the view left"), \
543 	KEY_("$", "Scroll view to the rightmost position"), \
544 	KEY_("0", "Scroll view to the leftmost position"), \
545 	KEY_("-", "Decrease size of the focussed split"), \
546 	KEY_("+", "Increase size of the focussed split"), \
547 	KEY_("Tab", "Switch focus between views"), \
548 	KEY_("F", "Toggle fullscreen mode"), \
549 	KEY_("/", "Open prompt to enter search term"), \
550 	KEY_("n", "Find next line/token matching the current search term"), \
551 	KEY_("N", "Find previous line/token matching the current search term"),\
552 	KEY_("q", "Quit the focussed view; Quit help screen"), \
553 	KEY_("Q", "Quit tog"), \
554 	\
555 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
556 	KEY_("< ,", "Move cursor up one commit"), \
557 	KEY_("> .", "Move cursor down one commit"), \
558 	KEY_("Enter", "Open diff view of the selected commit"), \
559 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
560 	KEY_("R", "Open ref view of all repository references"), \
561 	KEY_("T", "Display tree view of the repository from the selected" \
562 	    " commit"), \
563 	KEY_("@", "Toggle between displaying author and committer name"), \
564 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
565 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
566 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
567 	\
568 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
569 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
570 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
571 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
572 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
573 	    " data"), \
574 	KEY_("(", "Go to the previous file in the diff"), \
575 	KEY_(")", "Go to the next file in the diff"), \
576 	KEY_("{", "Go to the previous hunk in the diff"), \
577 	KEY_("}", "Go to the next hunk in the diff"), \
578 	KEY_("[", "Decrease the number of context lines"), \
579 	KEY_("]", "Increase the number of context lines"), \
580 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
581 	\
582 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
583 	KEY_("Enter", "Display diff view of the selected line's commit"), \
584 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
585 	KEY_("L", "Open log view for the currently selected annotated line"), \
586 	KEY_("C", "Reload view with the previously blamed commit"), \
587 	KEY_("c", "Reload view with the version of the file found in the" \
588 	    " selected line's commit"), \
589 	KEY_("p", "Reload view with the version of the file found in the" \
590 	    " selected line's parent commit"), \
591 	\
592 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
593 	KEY_("Enter", "Enter selected directory or open blame view of the" \
594 	    " selected file"), \
595 	KEY_("L", "Open log view for the selected entry"), \
596 	KEY_("R", "Open ref view of all repository references"), \
597 	KEY_("i", "Show object IDs for all tree entries"), \
598 	KEY_("Backspace", "Return to the parent directory"), \
599 	\
600 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
601 	KEY_("Enter", "Display log view of the selected reference"), \
602 	KEY_("T", "Display tree view of the selected reference"), \
603 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
604 	KEY_("m", "Toggle display of last modified date for each reference"), \
605 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
606 	KEY_("C-l", "Reload view with all repository references")
607 
608 struct tog_key_map {
609 	const char		*keys;
610 	const char		*info;
611 	enum tog_keymap_type	 type;
612 };
613 
614 /* curses io for tog regress */
615 struct tog_io {
616 	FILE	*cin;
617 	FILE	*cout;
618 	FILE	*f;
619 } tog_io;
620 static int using_mock_io;
621 
622 #define TOG_SCREEN_DUMP		"SCREENDUMP"
623 #define TOG_SCREEN_DUMP_LEN	(sizeof(TOG_SCREEN_DUMP) - 1)
624 #define TOG_KEY_SCRDUMP		SHRT_MIN
625 
626 /*
627  * We implement two types of views: parent views and child views.
628  *
629  * The 'Tab' key switches focus between a parent view and its child view.
630  * Child views are shown side-by-side to their parent view, provided
631  * there is enough screen estate.
632  *
633  * When a new view is opened from within a parent view, this new view
634  * becomes a child view of the parent view, replacing any existing child.
635  *
636  * When a new view is opened from within a child view, this new view
637  * becomes a parent view which will obscure the views below until the
638  * user quits the new parent view by typing 'q'.
639  *
640  * This list of views contains parent views only.
641  * Child views are only pointed to by their parent view.
642  */
643 TAILQ_HEAD(tog_view_list_head, tog_view);
644 
645 struct tog_view {
646 	TAILQ_ENTRY(tog_view) entry;
647 	WINDOW *window;
648 	PANEL *panel;
649 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
650 	int resized_y, resized_x; /* begin_y/x based on user resizing */
651 	int maxx, x; /* max column and current start column */
652 	int lines, cols; /* copies of LINES and COLS */
653 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
654 	int gline, hiline; /* navigate to and highlight this nG line */
655 	int ch, count; /* current keymap and count prefix */
656 	int resized; /* set when in a resize event */
657 	int focussed; /* Only set on one parent or child view at a time. */
658 	int dying;
659 	struct tog_view *parent;
660 	struct tog_view *child;
661 
662 	/*
663 	 * This flag is initially set on parent views when a new child view
664 	 * is created. It gets toggled when the 'Tab' key switches focus
665 	 * between parent and child.
666 	 * The flag indicates whether focus should be passed on to our child
667 	 * view if this parent view gets picked for focus after another parent
668 	 * view was closed. This prevents child views from losing focus in such
669 	 * situations.
670 	 */
671 	int focus_child;
672 
673 	enum tog_view_mode mode;
674 	/* type-specific state */
675 	enum tog_view_type type;
676 	union {
677 		struct tog_diff_view_state diff;
678 		struct tog_log_view_state log;
679 		struct tog_blame_view_state blame;
680 		struct tog_tree_view_state tree;
681 		struct tog_ref_view_state ref;
682 		struct tog_help_view_state help;
683 	} state;
684 
685 	const struct got_error *(*show)(struct tog_view *);
686 	const struct got_error *(*input)(struct tog_view **,
687 	    struct tog_view *, int);
688 	const struct got_error *(*reset)(struct tog_view *);
689 	const struct got_error *(*resize)(struct tog_view *, int);
690 	const struct got_error *(*close)(struct tog_view *);
691 
692 	const struct got_error *(*search_start)(struct tog_view *);
693 	const struct got_error *(*search_next)(struct tog_view *);
694 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
695 	    int **, int **, int **, int **);
696 	int search_started;
697 	int searching;
698 #define TOG_SEARCH_FORWARD	1
699 #define TOG_SEARCH_BACKWARD	2
700 	int search_next_done;
701 #define TOG_SEARCH_HAVE_MORE	1
702 #define TOG_SEARCH_NO_MORE	2
703 #define TOG_SEARCH_HAVE_NONE	3
704 	regex_t regex;
705 	regmatch_t regmatch;
706 	const char *action;
707 };
708 
709 static const struct got_error *open_diff_view(struct tog_view *,
710     struct got_object_id *, struct got_object_id *,
711     const char *, const char *, int, int, int, struct tog_view *,
712     struct got_repository *);
713 static const struct got_error *show_diff_view(struct tog_view *);
714 static const struct got_error *input_diff_view(struct tog_view **,
715     struct tog_view *, int);
716 static const struct got_error *reset_diff_view(struct tog_view *);
717 static const struct got_error* close_diff_view(struct tog_view *);
718 static const struct got_error *search_start_diff_view(struct tog_view *);
719 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
720     size_t *, int **, int **, int **, int **);
721 static const struct got_error *search_next_view_match(struct tog_view *);
722 
723 static const struct got_error *open_log_view(struct tog_view *,
724     struct got_object_id *, struct got_repository *,
725     const char *, const char *, int);
726 static const struct got_error * show_log_view(struct tog_view *);
727 static const struct got_error *input_log_view(struct tog_view **,
728     struct tog_view *, int);
729 static const struct got_error *resize_log_view(struct tog_view *, int);
730 static const struct got_error *close_log_view(struct tog_view *);
731 static const struct got_error *search_start_log_view(struct tog_view *);
732 static const struct got_error *search_next_log_view(struct tog_view *);
733 
734 static const struct got_error *open_blame_view(struct tog_view *, char *,
735     struct got_object_id *, struct got_repository *);
736 static const struct got_error *show_blame_view(struct tog_view *);
737 static const struct got_error *input_blame_view(struct tog_view **,
738     struct tog_view *, int);
739 static const struct got_error *reset_blame_view(struct tog_view *);
740 static const struct got_error *close_blame_view(struct tog_view *);
741 static const struct got_error *search_start_blame_view(struct tog_view *);
742 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
743     size_t *, int **, int **, int **, int **);
744 
745 static const struct got_error *open_tree_view(struct tog_view *,
746     struct got_object_id *, const char *, struct got_repository *);
747 static const struct got_error *show_tree_view(struct tog_view *);
748 static const struct got_error *input_tree_view(struct tog_view **,
749     struct tog_view *, int);
750 static const struct got_error *close_tree_view(struct tog_view *);
751 static const struct got_error *search_start_tree_view(struct tog_view *);
752 static const struct got_error *search_next_tree_view(struct tog_view *);
753 
754 static const struct got_error *open_ref_view(struct tog_view *,
755     struct got_repository *);
756 static const struct got_error *show_ref_view(struct tog_view *);
757 static const struct got_error *input_ref_view(struct tog_view **,
758     struct tog_view *, int);
759 static const struct got_error *close_ref_view(struct tog_view *);
760 static const struct got_error *search_start_ref_view(struct tog_view *);
761 static const struct got_error *search_next_ref_view(struct tog_view *);
762 
763 static const struct got_error *open_help_view(struct tog_view *,
764     struct tog_view *);
765 static const struct got_error *show_help_view(struct tog_view *);
766 static const struct got_error *input_help_view(struct tog_view **,
767     struct tog_view *, int);
768 static const struct got_error *reset_help_view(struct tog_view *);
769 static const struct got_error* close_help_view(struct tog_view *);
770 static const struct got_error *search_start_help_view(struct tog_view *);
771 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
772     size_t *, int **, int **, int **, int **);
773 
774 static volatile sig_atomic_t tog_sigwinch_received;
775 static volatile sig_atomic_t tog_sigpipe_received;
776 static volatile sig_atomic_t tog_sigcont_received;
777 static volatile sig_atomic_t tog_sigint_received;
778 static volatile sig_atomic_t tog_sigterm_received;
779 
780 static void
781 tog_sigwinch(int signo)
782 {
783 	tog_sigwinch_received = 1;
784 }
785 
786 static void
787 tog_sigpipe(int signo)
788 {
789 	tog_sigpipe_received = 1;
790 }
791 
792 static void
793 tog_sigcont(int signo)
794 {
795 	tog_sigcont_received = 1;
796 }
797 
798 static void
799 tog_sigint(int signo)
800 {
801 	tog_sigint_received = 1;
802 }
803 
804 static void
805 tog_sigterm(int signo)
806 {
807 	tog_sigterm_received = 1;
808 }
809 
810 static int
811 tog_fatal_signal_received(void)
812 {
813 	return (tog_sigpipe_received ||
814 	    tog_sigint_received || tog_sigterm_received);
815 }
816 
817 static const struct got_error *
818 view_close(struct tog_view *view)
819 {
820 	const struct got_error *err = NULL, *child_err = NULL;
821 
822 	if (view->child) {
823 		child_err = view_close(view->child);
824 		view->child = NULL;
825 	}
826 	if (view->close)
827 		err = view->close(view);
828 	if (view->panel)
829 		del_panel(view->panel);
830 	if (view->window)
831 		delwin(view->window);
832 	free(view);
833 	return err ? err : child_err;
834 }
835 
836 static struct tog_view *
837 view_open(int nlines, int ncols, int begin_y, int begin_x,
838     enum tog_view_type type)
839 {
840 	struct tog_view *view = calloc(1, sizeof(*view));
841 
842 	if (view == NULL)
843 		return NULL;
844 
845 	view->type = type;
846 	view->lines = LINES;
847 	view->cols = COLS;
848 	view->nlines = nlines ? nlines : LINES - begin_y;
849 	view->ncols = ncols ? ncols : COLS - begin_x;
850 	view->begin_y = begin_y;
851 	view->begin_x = begin_x;
852 	view->window = newwin(nlines, ncols, begin_y, begin_x);
853 	if (view->window == NULL) {
854 		view_close(view);
855 		return NULL;
856 	}
857 	view->panel = new_panel(view->window);
858 	if (view->panel == NULL ||
859 	    set_panel_userptr(view->panel, view) != OK) {
860 		view_close(view);
861 		return NULL;
862 	}
863 
864 	keypad(view->window, TRUE);
865 	return view;
866 }
867 
868 static int
869 view_split_begin_x(int begin_x)
870 {
871 	if (begin_x > 0 || COLS < 120)
872 		return 0;
873 	return (COLS - MAX(COLS / 2, 80));
874 }
875 
876 /* XXX Stub till we decide what to do. */
877 static int
878 view_split_begin_y(int lines)
879 {
880 	return lines * HSPLIT_SCALE;
881 }
882 
883 static const struct got_error *view_resize(struct tog_view *);
884 
885 static const struct got_error *
886 view_splitscreen(struct tog_view *view)
887 {
888 	const struct got_error *err = NULL;
889 
890 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
891 		if (view->resized_y && view->resized_y < view->lines)
892 			view->begin_y = view->resized_y;
893 		else
894 			view->begin_y = view_split_begin_y(view->nlines);
895 		view->begin_x = 0;
896 	} else if (!view->resized) {
897 		if (view->resized_x && view->resized_x < view->cols - 1 &&
898 		    view->cols > 119)
899 			view->begin_x = view->resized_x;
900 		else
901 			view->begin_x = view_split_begin_x(0);
902 		view->begin_y = 0;
903 	}
904 	view->nlines = LINES - view->begin_y;
905 	view->ncols = COLS - view->begin_x;
906 	view->lines = LINES;
907 	view->cols = COLS;
908 	err = view_resize(view);
909 	if (err)
910 		return err;
911 
912 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
913 		view->parent->nlines = view->begin_y;
914 
915 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
916 		return got_error_from_errno("mvwin");
917 
918 	return NULL;
919 }
920 
921 static const struct got_error *
922 view_fullscreen(struct tog_view *view)
923 {
924 	const struct got_error *err = NULL;
925 
926 	view->begin_x = 0;
927 	view->begin_y = view->resized ? view->begin_y : 0;
928 	view->nlines = view->resized ? view->nlines : LINES;
929 	view->ncols = COLS;
930 	view->lines = LINES;
931 	view->cols = COLS;
932 	err = view_resize(view);
933 	if (err)
934 		return err;
935 
936 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
937 		return got_error_from_errno("mvwin");
938 
939 	return NULL;
940 }
941 
942 static int
943 view_is_parent_view(struct tog_view *view)
944 {
945 	return view->parent == NULL;
946 }
947 
948 static int
949 view_is_splitscreen(struct tog_view *view)
950 {
951 	return view->begin_x > 0 || view->begin_y > 0;
952 }
953 
954 static int
955 view_is_fullscreen(struct tog_view *view)
956 {
957 	return view->nlines == LINES && view->ncols == COLS;
958 }
959 
960 static int
961 view_is_hsplit_top(struct tog_view *view)
962 {
963 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
964 	    view_is_splitscreen(view->child);
965 }
966 
967 static void
968 view_border(struct tog_view *view)
969 {
970 	PANEL *panel;
971 	const struct tog_view *view_above;
972 
973 	if (view->parent)
974 		return view_border(view->parent);
975 
976 	panel = panel_above(view->panel);
977 	if (panel == NULL)
978 		return;
979 
980 	view_above = panel_userptr(panel);
981 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
982 		mvwhline(view->window, view_above->begin_y - 1,
983 		    view->begin_x, got_locale_is_utf8() ?
984 		    ACS_HLINE : '-', view->ncols);
985 	else
986 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
987 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
988 }
989 
990 static const struct got_error *view_init_hsplit(struct tog_view *, int);
991 static const struct got_error *request_log_commits(struct tog_view *);
992 static const struct got_error *offset_selection_down(struct tog_view *);
993 static void offset_selection_up(struct tog_view *);
994 static void view_get_split(struct tog_view *, int *, int *);
995 
996 static const struct got_error *
997 view_resize(struct tog_view *view)
998 {
999 	const struct got_error	*err = NULL;
1000 	int			 dif, nlines, ncols;
1001 
1002 	dif = LINES - view->lines;  /* line difference */
1003 
1004 	if (view->lines > LINES)
1005 		nlines = view->nlines - (view->lines - LINES);
1006 	else
1007 		nlines = view->nlines + (LINES - view->lines);
1008 	if (view->cols > COLS)
1009 		ncols = view->ncols - (view->cols - COLS);
1010 	else
1011 		ncols = view->ncols + (COLS - view->cols);
1012 
1013 	if (view->child) {
1014 		int hs = view->child->begin_y;
1015 
1016 		if (!view_is_fullscreen(view))
1017 			view->child->begin_x = view_split_begin_x(view->begin_x);
1018 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1019 		    view->child->begin_x == 0) {
1020 			ncols = COLS;
1021 
1022 			view_fullscreen(view->child);
1023 			if (view->child->focussed)
1024 				show_panel(view->child->panel);
1025 			else
1026 				show_panel(view->panel);
1027 		} else {
1028 			ncols = view->child->begin_x;
1029 
1030 			view_splitscreen(view->child);
1031 			show_panel(view->child->panel);
1032 		}
1033 		/*
1034 		 * XXX This is ugly and needs to be moved into the above
1035 		 * logic but "works" for now and my attempts at moving it
1036 		 * break either 'tab' or 'F' key maps in horizontal splits.
1037 		 */
1038 		if (hs) {
1039 			err = view_splitscreen(view->child);
1040 			if (err)
1041 				return err;
1042 			if (dif < 0) { /* top split decreased */
1043 				err = offset_selection_down(view);
1044 				if (err)
1045 					return err;
1046 			}
1047 			view_border(view);
1048 			update_panels();
1049 			doupdate();
1050 			show_panel(view->child->panel);
1051 			nlines = view->nlines;
1052 		}
1053 	} else if (view->parent == NULL)
1054 		ncols = COLS;
1055 
1056 	if (view->resize && dif > 0) {
1057 		err = view->resize(view, dif);
1058 		if (err)
1059 			return err;
1060 	}
1061 
1062 	if (wresize(view->window, nlines, ncols) == ERR)
1063 		return got_error_from_errno("wresize");
1064 	if (replace_panel(view->panel, view->window) == ERR)
1065 		return got_error_from_errno("replace_panel");
1066 	wclear(view->window);
1067 
1068 	view->nlines = nlines;
1069 	view->ncols = ncols;
1070 	view->lines = LINES;
1071 	view->cols = COLS;
1072 
1073 	return NULL;
1074 }
1075 
1076 static const struct got_error *
1077 resize_log_view(struct tog_view *view, int increase)
1078 {
1079 	struct tog_log_view_state	*s = &view->state.log;
1080 	const struct got_error		*err = NULL;
1081 	int				 n = 0;
1082 
1083 	if (s->selected_entry)
1084 		n = s->selected_entry->idx + view->lines - s->selected;
1085 
1086 	/*
1087 	 * Request commits to account for the increased
1088 	 * height so we have enough to populate the view.
1089 	 */
1090 	if (s->commits->ncommits < n) {
1091 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1092 		err = request_log_commits(view);
1093 	}
1094 
1095 	return err;
1096 }
1097 
1098 static void
1099 view_adjust_offset(struct tog_view *view, int n)
1100 {
1101 	if (n == 0)
1102 		return;
1103 
1104 	if (view->parent && view->parent->offset) {
1105 		if (view->parent->offset + n >= 0)
1106 			view->parent->offset += n;
1107 		else
1108 			view->parent->offset = 0;
1109 	} else if (view->offset) {
1110 		if (view->offset - n >= 0)
1111 			view->offset -= n;
1112 		else
1113 			view->offset = 0;
1114 	}
1115 }
1116 
1117 static const struct got_error *
1118 view_resize_split(struct tog_view *view, int resize)
1119 {
1120 	const struct got_error	*err = NULL;
1121 	struct tog_view		*v = NULL;
1122 
1123 	if (view->parent)
1124 		v = view->parent;
1125 	else
1126 		v = view;
1127 
1128 	if (!v->child || !view_is_splitscreen(v->child))
1129 		return NULL;
1130 
1131 	v->resized = v->child->resized = resize;  /* lock for resize event */
1132 
1133 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1134 		if (v->child->resized_y)
1135 			v->child->begin_y = v->child->resized_y;
1136 		if (view->parent)
1137 			v->child->begin_y -= resize;
1138 		else
1139 			v->child->begin_y += resize;
1140 		if (v->child->begin_y < 3) {
1141 			view->count = 0;
1142 			v->child->begin_y = 3;
1143 		} else if (v->child->begin_y > LINES - 1) {
1144 			view->count = 0;
1145 			v->child->begin_y = LINES - 1;
1146 		}
1147 		v->ncols = COLS;
1148 		v->child->ncols = COLS;
1149 		view_adjust_offset(view, resize);
1150 		err = view_init_hsplit(v, v->child->begin_y);
1151 		if (err)
1152 			return err;
1153 		v->child->resized_y = v->child->begin_y;
1154 	} else {
1155 		if (v->child->resized_x)
1156 			v->child->begin_x = v->child->resized_x;
1157 		if (view->parent)
1158 			v->child->begin_x -= resize;
1159 		else
1160 			v->child->begin_x += resize;
1161 		if (v->child->begin_x < 11) {
1162 			view->count = 0;
1163 			v->child->begin_x = 11;
1164 		} else if (v->child->begin_x > COLS - 1) {
1165 			view->count = 0;
1166 			v->child->begin_x = COLS - 1;
1167 		}
1168 		v->child->resized_x = v->child->begin_x;
1169 	}
1170 
1171 	v->child->mode = v->mode;
1172 	v->child->nlines = v->lines - v->child->begin_y;
1173 	v->child->ncols = v->cols - v->child->begin_x;
1174 	v->focus_child = 1;
1175 
1176 	err = view_fullscreen(v);
1177 	if (err)
1178 		return err;
1179 	err = view_splitscreen(v->child);
1180 	if (err)
1181 		return err;
1182 
1183 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1184 		err = offset_selection_down(v->child);
1185 		if (err)
1186 			return err;
1187 	}
1188 
1189 	if (v->resize)
1190 		err = v->resize(v, 0);
1191 	else if (v->child->resize)
1192 		err = v->child->resize(v->child, 0);
1193 
1194 	v->resized = v->child->resized = 0;
1195 
1196 	return err;
1197 }
1198 
1199 static void
1200 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1201 {
1202 	struct tog_view *v = src->child ? src->child : src;
1203 
1204 	dst->resized_x = v->resized_x;
1205 	dst->resized_y = v->resized_y;
1206 }
1207 
1208 static const struct got_error *
1209 view_close_child(struct tog_view *view)
1210 {
1211 	const struct got_error *err = NULL;
1212 
1213 	if (view->child == NULL)
1214 		return NULL;
1215 
1216 	err = view_close(view->child);
1217 	view->child = NULL;
1218 	return err;
1219 }
1220 
1221 static const struct got_error *
1222 view_set_child(struct tog_view *view, struct tog_view *child)
1223 {
1224 	const struct got_error *err = NULL;
1225 
1226 	view->child = child;
1227 	child->parent = view;
1228 
1229 	err = view_resize(view);
1230 	if (err)
1231 		return err;
1232 
1233 	if (view->child->resized_x || view->child->resized_y)
1234 		err = view_resize_split(view, 0);
1235 
1236 	return err;
1237 }
1238 
1239 static const struct got_error *view_dispatch_request(struct tog_view **,
1240     struct tog_view *, enum tog_view_type, int, int);
1241 
1242 static const struct got_error *
1243 view_request_new(struct tog_view **requested, struct tog_view *view,
1244     enum tog_view_type request)
1245 {
1246 	struct tog_view		*new_view = NULL;
1247 	const struct got_error	*err;
1248 	int			 y = 0, x = 0;
1249 
1250 	*requested = NULL;
1251 
1252 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1253 		view_get_split(view, &y, &x);
1254 
1255 	err = view_dispatch_request(&new_view, view, request, y, x);
1256 	if (err)
1257 		return err;
1258 
1259 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1260 	    request != TOG_VIEW_HELP) {
1261 		err = view_init_hsplit(view, y);
1262 		if (err)
1263 			return err;
1264 	}
1265 
1266 	view->focussed = 0;
1267 	new_view->focussed = 1;
1268 	new_view->mode = view->mode;
1269 	new_view->nlines = request == TOG_VIEW_HELP ?
1270 	    view->lines : view->lines - y;
1271 
1272 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1273 		view_transfer_size(new_view, view);
1274 		err = view_close_child(view);
1275 		if (err)
1276 			return err;
1277 		err = view_set_child(view, new_view);
1278 		if (err)
1279 			return err;
1280 		view->focus_child = 1;
1281 	} else
1282 		*requested = new_view;
1283 
1284 	return NULL;
1285 }
1286 
1287 static void
1288 tog_resizeterm(void)
1289 {
1290 	int cols, lines;
1291 	struct winsize size;
1292 
1293 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1294 		cols = 80;     /* Default */
1295 		lines = 24;
1296 	} else {
1297 		cols = size.ws_col;
1298 		lines = size.ws_row;
1299 	}
1300 	resize_term(lines, cols);
1301 }
1302 
1303 static const struct got_error *
1304 view_search_start(struct tog_view *view, int fast_refresh)
1305 {
1306 	const struct got_error *err = NULL;
1307 	struct tog_view *v = view;
1308 	char pattern[1024];
1309 	int ret;
1310 
1311 	if (view->search_started) {
1312 		regfree(&view->regex);
1313 		view->searching = 0;
1314 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1315 	}
1316 	view->search_started = 0;
1317 
1318 	if (view->nlines < 1)
1319 		return NULL;
1320 
1321 	if (view_is_hsplit_top(view))
1322 		v = view->child;
1323 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1324 		v = view->parent;
1325 
1326 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1327 	wclrtoeol(v->window);
1328 
1329 	nodelay(v->window, FALSE);  /* block for search term input */
1330 	nocbreak();
1331 	echo();
1332 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1333 	wrefresh(v->window);
1334 	cbreak();
1335 	noecho();
1336 	nodelay(v->window, TRUE);
1337 	if (!fast_refresh && !using_mock_io)
1338 		halfdelay(10);
1339 	if (ret == ERR)
1340 		return NULL;
1341 
1342 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1343 		err = view->search_start(view);
1344 		if (err) {
1345 			regfree(&view->regex);
1346 			return err;
1347 		}
1348 		view->search_started = 1;
1349 		view->searching = TOG_SEARCH_FORWARD;
1350 		view->search_next_done = 0;
1351 		view->search_next(view);
1352 	}
1353 
1354 	return NULL;
1355 }
1356 
1357 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1358 static const struct got_error *
1359 switch_split(struct tog_view *view)
1360 {
1361 	const struct got_error	*err = NULL;
1362 	struct tog_view		*v = NULL;
1363 
1364 	if (view->parent)
1365 		v = view->parent;
1366 	else
1367 		v = view;
1368 
1369 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1370 		v->mode = TOG_VIEW_SPLIT_VERT;
1371 	else
1372 		v->mode = TOG_VIEW_SPLIT_HRZN;
1373 
1374 	if (!v->child)
1375 		return NULL;
1376 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1377 		v->mode = TOG_VIEW_SPLIT_NONE;
1378 
1379 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1380 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1381 		v->child->begin_y = v->child->resized_y;
1382 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1383 		v->child->begin_x = v->child->resized_x;
1384 
1385 
1386 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1387 		v->ncols = COLS;
1388 		v->child->ncols = COLS;
1389 		v->child->nscrolled = LINES - v->child->nlines;
1390 
1391 		err = view_init_hsplit(v, v->child->begin_y);
1392 		if (err)
1393 			return err;
1394 	}
1395 	v->child->mode = v->mode;
1396 	v->child->nlines = v->lines - v->child->begin_y;
1397 	v->focus_child = 1;
1398 
1399 	err = view_fullscreen(v);
1400 	if (err)
1401 		return err;
1402 	err = view_splitscreen(v->child);
1403 	if (err)
1404 		return err;
1405 
1406 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1407 		v->mode = TOG_VIEW_SPLIT_VERT;
1408 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1409 		err = offset_selection_down(v);
1410 		if (err)
1411 			return err;
1412 		err = offset_selection_down(v->child);
1413 		if (err)
1414 			return err;
1415 	} else {
1416 		offset_selection_up(v);
1417 		offset_selection_up(v->child);
1418 	}
1419 	if (v->resize)
1420 		err = v->resize(v, 0);
1421 	else if (v->child->resize)
1422 		err = v->child->resize(v->child, 0);
1423 
1424 	return err;
1425 }
1426 
1427 /*
1428  * Strip trailing whitespace from str starting at byte *n;
1429  * if *n < 0, use strlen(str). Return new str length in *n.
1430  */
1431 static void
1432 strip_trailing_ws(char *str, int *n)
1433 {
1434 	size_t x = *n;
1435 
1436 	if (str == NULL || *str == '\0')
1437 		return;
1438 
1439 	if (x < 0)
1440 		x = strlen(str);
1441 
1442 	while (x-- > 0 && isspace((unsigned char)str[x]))
1443 		str[x] = '\0';
1444 
1445 	*n = x + 1;
1446 }
1447 
1448 /*
1449  * Extract visible substring of line y from the curses screen
1450  * and strip trailing whitespace. If vline is set and locale is
1451  * UTF-8, overwrite line[vline] with '|' because the ACS_VLINE
1452  * character is written out as 'x'. Write the line to file f.
1453  */
1454 static const struct got_error *
1455 view_write_line(FILE *f, int y, int vline)
1456 {
1457 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1458 	int	r, w;
1459 
1460 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1461 	if (r == ERR)
1462 		return got_error_fmt(GOT_ERR_RANGE,
1463 		    "failed to extract line %d", y);
1464 
1465 	/*
1466 	 * In some views, lines are padded with blanks to COLS width.
1467 	 * Strip them so we can diff without the -b flag when testing.
1468 	 */
1469 	strip_trailing_ws(line, &r);
1470 
1471 	if (vline > 0 && got_locale_is_utf8())
1472 		line[vline] = '|';
1473 
1474 	w = fprintf(f, "%s\n", line);
1475 	if (w != r + 1)		/* \n */
1476 		return got_ferror(f, GOT_ERR_IO);
1477 
1478 	return NULL;
1479 }
1480 
1481 /*
1482  * Capture the visible curses screen by writing each line to the
1483  * file at the path set via the TOG_SCR_DUMP environment variable.
1484  */
1485 static const struct got_error *
1486 screendump(struct tog_view *view)
1487 {
1488 	const struct got_error	*err;
1489 	FILE			*f = NULL;
1490 	const char		*path;
1491 	int			 i;
1492 
1493 	path = getenv("TOG_SCR_DUMP");
1494 	if (path == NULL || *path == '\0')
1495 		return got_error_msg(GOT_ERR_BAD_PATH,
1496 		    "TOG_SCR_DUMP path not set to capture screen dump");
1497 	f = fopen(path, "wex");
1498 	if (f == NULL)
1499 		return got_error_from_errno_fmt("fopen: %s", path);
1500 
1501 	if ((view->child && view->child->begin_x) ||
1502 	    (view->parent && view->begin_x)) {
1503 		int ncols = view->child ? view->ncols : view->parent->ncols;
1504 
1505 		/* vertical splitscreen */
1506 		for (i = 0; i < view->nlines; ++i) {
1507 			err = view_write_line(f, i, ncols - 1);
1508 			if (err)
1509 				goto done;
1510 		}
1511 	} else {
1512 		int hline = 0;
1513 
1514 		/* fullscreen or horizontal splitscreen */
1515 		if ((view->child && view->child->begin_y) ||
1516 		    (view->parent && view->begin_y))	/* hsplit */
1517 			hline = view->child ?
1518 			    view->child->begin_y : view->begin_y;
1519 
1520 		for (i = 0; i < view->lines; i++) {
1521 			if (hline && got_locale_is_utf8() && i == hline - 1) {
1522 				int c;
1523 
1524 				/* ACS_HLINE writes out as 'q', overwrite it */
1525 				for (c = 0; c < view->cols; ++c)
1526 					fputc('-', f);
1527 				fputc('\n', f);
1528 				continue;
1529 			}
1530 
1531 			err = view_write_line(f, i, 0);
1532 			if (err)
1533 				goto done;
1534 		}
1535 	}
1536 
1537 done:
1538 	if (f && fclose(f) == EOF && err == NULL)
1539 		err = got_ferror(f, GOT_ERR_IO);
1540 	return err;
1541 }
1542 
1543 /*
1544  * Compute view->count from numeric input. Assign total to view->count and
1545  * return first non-numeric key entered.
1546  */
1547 static int
1548 get_compound_key(struct tog_view *view, int c)
1549 {
1550 	struct tog_view	*v = view;
1551 	int		 x, n = 0;
1552 
1553 	if (view_is_hsplit_top(view))
1554 		v = view->child;
1555 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1556 		v = view->parent;
1557 
1558 	view->count = 0;
1559 	cbreak();  /* block for input */
1560 	nodelay(view->window, FALSE);
1561 	wmove(v->window, v->nlines - 1, 0);
1562 	wclrtoeol(v->window);
1563 	waddch(v->window, ':');
1564 
1565 	do {
1566 		x = getcurx(v->window);
1567 		if (x != ERR && x < view->ncols) {
1568 			waddch(v->window, c);
1569 			wrefresh(v->window);
1570 		}
1571 
1572 		/*
1573 		 * Don't overflow. Max valid request should be the greatest
1574 		 * between the longest and total lines; cap at 10 million.
1575 		 */
1576 		if (n >= 9999999)
1577 			n = 9999999;
1578 		else
1579 			n = n * 10 + (c - '0');
1580 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1581 
1582 	if (c == 'G' || c == 'g') {	/* nG key map */
1583 		view->gline = view->hiline = n;
1584 		n = 0;
1585 		c = 0;
1586 	}
1587 
1588 	/* Massage excessive or inapplicable values at the input handler. */
1589 	view->count = n;
1590 
1591 	return c;
1592 }
1593 
1594 static void
1595 action_report(struct tog_view *view)
1596 {
1597 	struct tog_view *v = view;
1598 
1599 	if (view_is_hsplit_top(view))
1600 		v = view->child;
1601 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1602 		v = view->parent;
1603 
1604 	wmove(v->window, v->nlines - 1, 0);
1605 	wclrtoeol(v->window);
1606 	wprintw(v->window, ":%s", view->action);
1607 	wrefresh(v->window);
1608 
1609 	/*
1610 	 * Clear action status report. Only clear in blame view
1611 	 * once annotating is complete, otherwise it's too fast.
1612 	 */
1613 	if (view->type == TOG_VIEW_BLAME) {
1614 		if (view->state.blame.blame_complete)
1615 			view->action = NULL;
1616 	} else
1617 		view->action = NULL;
1618 }
1619 
1620 /*
1621  * Read the next line from the test script and assign
1622  * key instruction to *ch. If at EOF, set the *done flag.
1623  */
1624 static const struct got_error *
1625 tog_read_script_key(FILE *script, int *ch, int *done)
1626 {
1627 	const struct got_error	*err = NULL;
1628 	char			*line = NULL;
1629 	size_t			 linesz = 0;
1630 
1631 	if (getline(&line, &linesz, script) == -1) {
1632 		if (feof(script)) {
1633 			*done = 1;
1634 			goto done;
1635 		} else {
1636 			err = got_ferror(script, GOT_ERR_IO);
1637 			goto done;
1638 		}
1639 	} else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1640 		*ch = KEY_ENTER;
1641 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1642 		*ch = KEY_RIGHT;
1643 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1644 		*ch = KEY_LEFT;
1645 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1646 		*ch = KEY_DOWN;
1647 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1648 		*ch = KEY_UP;
1649 	else if (strncasecmp(line, TOG_SCREEN_DUMP, TOG_SCREEN_DUMP_LEN) == 0)
1650 		*ch = TOG_KEY_SCRDUMP;
1651 	else
1652 		*ch = *line;
1653 
1654 done:
1655 	free(line);
1656 	return err;
1657 }
1658 
1659 static const struct got_error *
1660 view_input(struct tog_view **new, int *done, struct tog_view *view,
1661     struct tog_view_list_head *views, int fast_refresh)
1662 {
1663 	const struct got_error *err = NULL;
1664 	struct tog_view *v;
1665 	int ch, errcode;
1666 
1667 	*new = NULL;
1668 
1669 	if (view->action)
1670 		action_report(view);
1671 
1672 	/* Clear "no matches" indicator. */
1673 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1674 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1675 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1676 		view->count = 0;
1677 	}
1678 
1679 	if (view->searching && !view->search_next_done) {
1680 		errcode = pthread_mutex_unlock(&tog_mutex);
1681 		if (errcode)
1682 			return got_error_set_errno(errcode,
1683 			    "pthread_mutex_unlock");
1684 		sched_yield();
1685 		errcode = pthread_mutex_lock(&tog_mutex);
1686 		if (errcode)
1687 			return got_error_set_errno(errcode,
1688 			    "pthread_mutex_lock");
1689 		view->search_next(view);
1690 		return NULL;
1691 	}
1692 
1693 	/* Allow threads to make progress while we are waiting for input. */
1694 	errcode = pthread_mutex_unlock(&tog_mutex);
1695 	if (errcode)
1696 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1697 
1698 	if (using_mock_io) {
1699 		err = tog_read_script_key(tog_io.f, &ch, done);
1700 		if (err)
1701 			return err;
1702 	} else if (view->count && --view->count) {
1703 		cbreak();
1704 		nodelay(view->window, TRUE);
1705 		ch = wgetch(view->window);
1706 		/* let C-g or backspace abort unfinished count */
1707 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1708 			view->count = 0;
1709 		else
1710 			ch = view->ch;
1711 	} else {
1712 		ch = wgetch(view->window);
1713 		if (ch >= '1' && ch  <= '9')
1714 			view->ch = ch = get_compound_key(view, ch);
1715 	}
1716 	if (view->hiline && ch != ERR && ch != 0)
1717 		view->hiline = 0;  /* key pressed, clear line highlight */
1718 	nodelay(view->window, TRUE);
1719 	errcode = pthread_mutex_lock(&tog_mutex);
1720 	if (errcode)
1721 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1722 
1723 	if (tog_sigwinch_received || tog_sigcont_received) {
1724 		tog_resizeterm();
1725 		tog_sigwinch_received = 0;
1726 		tog_sigcont_received = 0;
1727 		TAILQ_FOREACH(v, views, entry) {
1728 			err = view_resize(v);
1729 			if (err)
1730 				return err;
1731 			err = v->input(new, v, KEY_RESIZE);
1732 			if (err)
1733 				return err;
1734 			if (v->child) {
1735 				err = view_resize(v->child);
1736 				if (err)
1737 					return err;
1738 				err = v->child->input(new, v->child,
1739 				    KEY_RESIZE);
1740 				if (err)
1741 					return err;
1742 				if (v->child->resized_x || v->child->resized_y) {
1743 					err = view_resize_split(v, 0);
1744 					if (err)
1745 						return err;
1746 				}
1747 			}
1748 		}
1749 	}
1750 
1751 	switch (ch) {
1752 	case '?':
1753 	case 'H':
1754 	case KEY_F(1):
1755 		if (view->type == TOG_VIEW_HELP)
1756 			err = view->reset(view);
1757 		else
1758 			err = view_request_new(new, view, TOG_VIEW_HELP);
1759 		break;
1760 	case '\t':
1761 		view->count = 0;
1762 		if (view->child) {
1763 			view->focussed = 0;
1764 			view->child->focussed = 1;
1765 			view->focus_child = 1;
1766 		} else if (view->parent) {
1767 			view->focussed = 0;
1768 			view->parent->focussed = 1;
1769 			view->parent->focus_child = 0;
1770 			if (!view_is_splitscreen(view)) {
1771 				if (view->parent->resize) {
1772 					err = view->parent->resize(view->parent,
1773 					    0);
1774 					if (err)
1775 						return err;
1776 				}
1777 				offset_selection_up(view->parent);
1778 				err = view_fullscreen(view->parent);
1779 				if (err)
1780 					return err;
1781 			}
1782 		}
1783 		break;
1784 	case 'q':
1785 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1786 			if (view->parent->resize) {
1787 				/* might need more commits to fill fullscreen */
1788 				err = view->parent->resize(view->parent, 0);
1789 				if (err)
1790 					break;
1791 			}
1792 			offset_selection_up(view->parent);
1793 		}
1794 		err = view->input(new, view, ch);
1795 		view->dying = 1;
1796 		break;
1797 	case 'Q':
1798 		*done = 1;
1799 		break;
1800 	case 'F':
1801 		view->count = 0;
1802 		if (view_is_parent_view(view)) {
1803 			if (view->child == NULL)
1804 				break;
1805 			if (view_is_splitscreen(view->child)) {
1806 				view->focussed = 0;
1807 				view->child->focussed = 1;
1808 				err = view_fullscreen(view->child);
1809 			} else {
1810 				err = view_splitscreen(view->child);
1811 				if (!err)
1812 					err = view_resize_split(view, 0);
1813 			}
1814 			if (err)
1815 				break;
1816 			err = view->child->input(new, view->child,
1817 			    KEY_RESIZE);
1818 		} else {
1819 			if (view_is_splitscreen(view)) {
1820 				view->parent->focussed = 0;
1821 				view->focussed = 1;
1822 				err = view_fullscreen(view);
1823 			} else {
1824 				err = view_splitscreen(view);
1825 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1826 					err = view_resize(view->parent);
1827 				if (!err)
1828 					err = view_resize_split(view, 0);
1829 			}
1830 			if (err)
1831 				break;
1832 			err = view->input(new, view, KEY_RESIZE);
1833 		}
1834 		if (err)
1835 			break;
1836 		if (view->resize) {
1837 			err = view->resize(view, 0);
1838 			if (err)
1839 				break;
1840 		}
1841 		if (view->parent)
1842 			err = offset_selection_down(view->parent);
1843 		if (!err)
1844 			err = offset_selection_down(view);
1845 		break;
1846 	case 'S':
1847 		view->count = 0;
1848 		err = switch_split(view);
1849 		break;
1850 	case '-':
1851 		err = view_resize_split(view, -1);
1852 		break;
1853 	case '+':
1854 		err = view_resize_split(view, 1);
1855 		break;
1856 	case KEY_RESIZE:
1857 		break;
1858 	case '/':
1859 		view->count = 0;
1860 		if (view->search_start)
1861 			view_search_start(view, fast_refresh);
1862 		else
1863 			err = view->input(new, view, ch);
1864 		break;
1865 	case 'N':
1866 	case 'n':
1867 		if (view->search_started && view->search_next) {
1868 			view->searching = (ch == 'n' ?
1869 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1870 			view->search_next_done = 0;
1871 			view->search_next(view);
1872 		} else
1873 			err = view->input(new, view, ch);
1874 		break;
1875 	case 'A':
1876 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1877 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1878 			view->action = "Patience diff algorithm";
1879 		} else {
1880 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1881 			view->action = "Myers diff algorithm";
1882 		}
1883 		TAILQ_FOREACH(v, views, entry) {
1884 			if (v->reset) {
1885 				err = v->reset(v);
1886 				if (err)
1887 					return err;
1888 			}
1889 			if (v->child && v->child->reset) {
1890 				err = v->child->reset(v->child);
1891 				if (err)
1892 					return err;
1893 			}
1894 		}
1895 		break;
1896 	case TOG_KEY_SCRDUMP:
1897 		err = screendump(view);
1898 		break;
1899 	default:
1900 		err = view->input(new, view, ch);
1901 		break;
1902 	}
1903 
1904 	return err;
1905 }
1906 
1907 static int
1908 view_needs_focus_indication(struct tog_view *view)
1909 {
1910 	if (view_is_parent_view(view)) {
1911 		if (view->child == NULL || view->child->focussed)
1912 			return 0;
1913 		if (!view_is_splitscreen(view->child))
1914 			return 0;
1915 	} else if (!view_is_splitscreen(view))
1916 		return 0;
1917 
1918 	return view->focussed;
1919 }
1920 
1921 static const struct got_error *
1922 tog_io_close(void)
1923 {
1924 	const struct got_error *err = NULL;
1925 
1926 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1927 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1928 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1929 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1930 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1931 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1932 
1933 	return err;
1934 }
1935 
1936 static const struct got_error *
1937 view_loop(struct tog_view *view)
1938 {
1939 	const struct got_error *err = NULL;
1940 	struct tog_view_list_head views;
1941 	struct tog_view *new_view;
1942 	char *mode;
1943 	int fast_refresh = 10;
1944 	int done = 0, errcode;
1945 
1946 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1947 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1948 		view->mode = TOG_VIEW_SPLIT_VERT;
1949 	else
1950 		view->mode = TOG_VIEW_SPLIT_HRZN;
1951 
1952 	errcode = pthread_mutex_lock(&tog_mutex);
1953 	if (errcode)
1954 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1955 
1956 	TAILQ_INIT(&views);
1957 	TAILQ_INSERT_HEAD(&views, view, entry);
1958 
1959 	view->focussed = 1;
1960 	err = view->show(view);
1961 	if (err)
1962 		return err;
1963 	update_panels();
1964 	doupdate();
1965 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1966 	    !tog_fatal_signal_received()) {
1967 		/* Refresh fast during initialization, then become slower. */
1968 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1969 			halfdelay(10); /* switch to once per second */
1970 
1971 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1972 		if (err)
1973 			break;
1974 
1975 		if (view->dying && view == TAILQ_FIRST(&views) &&
1976 		    TAILQ_NEXT(view, entry) == NULL)
1977 			done = 1;
1978 		if (done) {
1979 			struct tog_view *v;
1980 
1981 			/*
1982 			 * When we quit, scroll the screen up a single line
1983 			 * so we don't lose any information.
1984 			 */
1985 			TAILQ_FOREACH(v, &views, entry) {
1986 				wmove(v->window, 0, 0);
1987 				wdeleteln(v->window);
1988 				wnoutrefresh(v->window);
1989 				if (v->child && !view_is_fullscreen(v)) {
1990 					wmove(v->child->window, 0, 0);
1991 					wdeleteln(v->child->window);
1992 					wnoutrefresh(v->child->window);
1993 				}
1994 			}
1995 			doupdate();
1996 		}
1997 
1998 		if (view->dying) {
1999 			struct tog_view *v, *prev = NULL;
2000 
2001 			if (view_is_parent_view(view))
2002 				prev = TAILQ_PREV(view, tog_view_list_head,
2003 				    entry);
2004 			else if (view->parent)
2005 				prev = view->parent;
2006 
2007 			if (view->parent) {
2008 				view->parent->child = NULL;
2009 				view->parent->focus_child = 0;
2010 				/* Restore fullscreen line height. */
2011 				view->parent->nlines = view->parent->lines;
2012 				err = view_resize(view->parent);
2013 				if (err)
2014 					break;
2015 				/* Make resized splits persist. */
2016 				view_transfer_size(view->parent, view);
2017 			} else
2018 				TAILQ_REMOVE(&views, view, entry);
2019 
2020 			err = view_close(view);
2021 			if (err)
2022 				goto done;
2023 
2024 			view = NULL;
2025 			TAILQ_FOREACH(v, &views, entry) {
2026 				if (v->focussed)
2027 					break;
2028 			}
2029 			if (view == NULL && new_view == NULL) {
2030 				/* No view has focus. Try to pick one. */
2031 				if (prev)
2032 					view = prev;
2033 				else if (!TAILQ_EMPTY(&views)) {
2034 					view = TAILQ_LAST(&views,
2035 					    tog_view_list_head);
2036 				}
2037 				if (view) {
2038 					if (view->focus_child) {
2039 						view->child->focussed = 1;
2040 						view = view->child;
2041 					} else
2042 						view->focussed = 1;
2043 				}
2044 			}
2045 		}
2046 		if (new_view) {
2047 			struct tog_view *v, *t;
2048 			/* Only allow one parent view per type. */
2049 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2050 				if (v->type != new_view->type)
2051 					continue;
2052 				TAILQ_REMOVE(&views, v, entry);
2053 				err = view_close(v);
2054 				if (err)
2055 					goto done;
2056 				break;
2057 			}
2058 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2059 			view = new_view;
2060 		}
2061 		if (view && !done) {
2062 			if (view_is_parent_view(view)) {
2063 				if (view->child && view->child->focussed)
2064 					view = view->child;
2065 			} else {
2066 				if (view->parent && view->parent->focussed)
2067 					view = view->parent;
2068 			}
2069 			show_panel(view->panel);
2070 			if (view->child && view_is_splitscreen(view->child))
2071 				show_panel(view->child->panel);
2072 			if (view->parent && view_is_splitscreen(view)) {
2073 				err = view->parent->show(view->parent);
2074 				if (err)
2075 					goto done;
2076 			}
2077 			err = view->show(view);
2078 			if (err)
2079 				goto done;
2080 			if (view->child) {
2081 				err = view->child->show(view->child);
2082 				if (err)
2083 					goto done;
2084 			}
2085 			update_panels();
2086 			doupdate();
2087 		}
2088 	}
2089 done:
2090 	while (!TAILQ_EMPTY(&views)) {
2091 		const struct got_error *close_err;
2092 		view = TAILQ_FIRST(&views);
2093 		TAILQ_REMOVE(&views, view, entry);
2094 		close_err = view_close(view);
2095 		if (close_err && err == NULL)
2096 			err = close_err;
2097 	}
2098 
2099 	errcode = pthread_mutex_unlock(&tog_mutex);
2100 	if (errcode && err == NULL)
2101 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2102 
2103 	return err;
2104 }
2105 
2106 __dead static void
2107 usage_log(void)
2108 {
2109 	endwin();
2110 	fprintf(stderr,
2111 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2112 	    getprogname());
2113 	exit(1);
2114 }
2115 
2116 /* Create newly allocated wide-character string equivalent to a byte string. */
2117 static const struct got_error *
2118 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2119 {
2120 	char *vis = NULL;
2121 	const struct got_error *err = NULL;
2122 
2123 	*ws = NULL;
2124 	*wlen = mbstowcs(NULL, s, 0);
2125 	if (*wlen == (size_t)-1) {
2126 		int vislen;
2127 		if (errno != EILSEQ)
2128 			return got_error_from_errno("mbstowcs");
2129 
2130 		/* byte string invalid in current encoding; try to "fix" it */
2131 		err = got_mbsavis(&vis, &vislen, s);
2132 		if (err)
2133 			return err;
2134 		*wlen = mbstowcs(NULL, vis, 0);
2135 		if (*wlen == (size_t)-1) {
2136 			err = got_error_from_errno("mbstowcs"); /* give up */
2137 			goto done;
2138 		}
2139 	}
2140 
2141 	*ws = calloc(*wlen + 1, sizeof(**ws));
2142 	if (*ws == NULL) {
2143 		err = got_error_from_errno("calloc");
2144 		goto done;
2145 	}
2146 
2147 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2148 		err = got_error_from_errno("mbstowcs");
2149 done:
2150 	free(vis);
2151 	if (err) {
2152 		free(*ws);
2153 		*ws = NULL;
2154 		*wlen = 0;
2155 	}
2156 	return err;
2157 }
2158 
2159 static const struct got_error *
2160 expand_tab(char **ptr, const char *src)
2161 {
2162 	char	*dst;
2163 	size_t	 len, n, idx = 0, sz = 0;
2164 
2165 	*ptr = NULL;
2166 	n = len = strlen(src);
2167 	dst = malloc(n + 1);
2168 	if (dst == NULL)
2169 		return got_error_from_errno("malloc");
2170 
2171 	while (idx < len && src[idx]) {
2172 		const char c = src[idx];
2173 
2174 		if (c == '\t') {
2175 			size_t nb = TABSIZE - sz % TABSIZE;
2176 			char *p;
2177 
2178 			p = realloc(dst, n + nb);
2179 			if (p == NULL) {
2180 				free(dst);
2181 				return got_error_from_errno("realloc");
2182 
2183 			}
2184 			dst = p;
2185 			n += nb;
2186 			memset(dst + sz, ' ', nb);
2187 			sz += nb;
2188 		} else
2189 			dst[sz++] = src[idx];
2190 		++idx;
2191 	}
2192 
2193 	dst[sz] = '\0';
2194 	*ptr = dst;
2195 	return NULL;
2196 }
2197 
2198 /*
2199  * Advance at most n columns from wline starting at offset off.
2200  * Return the index to the first character after the span operation.
2201  * Return the combined column width of all spanned wide character in
2202  * *rcol.
2203  */
2204 static int
2205 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2206 {
2207 	int width, i, cols = 0;
2208 
2209 	if (n == 0) {
2210 		*rcol = cols;
2211 		return off;
2212 	}
2213 
2214 	for (i = off; wline[i] != L'\0'; ++i) {
2215 		if (wline[i] == L'\t')
2216 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2217 		else
2218 			width = wcwidth(wline[i]);
2219 
2220 		if (width == -1) {
2221 			width = 1;
2222 			wline[i] = L'.';
2223 		}
2224 
2225 		if (cols + width > n)
2226 			break;
2227 		cols += width;
2228 	}
2229 
2230 	*rcol = cols;
2231 	return i;
2232 }
2233 
2234 /*
2235  * Format a line for display, ensuring that it won't overflow a width limit.
2236  * With scrolling, the width returned refers to the scrolled version of the
2237  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2238  */
2239 static const struct got_error *
2240 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2241     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2242 {
2243 	const struct got_error *err = NULL;
2244 	int cols;
2245 	wchar_t *wline = NULL;
2246 	char *exstr = NULL;
2247 	size_t wlen;
2248 	int i, scrollx;
2249 
2250 	*wlinep = NULL;
2251 	*widthp = 0;
2252 
2253 	if (expand) {
2254 		err = expand_tab(&exstr, line);
2255 		if (err)
2256 			return err;
2257 	}
2258 
2259 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2260 	free(exstr);
2261 	if (err)
2262 		return err;
2263 
2264 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2265 
2266 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2267 		wline[wlen - 1] = L'\0';
2268 		wlen--;
2269 	}
2270 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2271 		wline[wlen - 1] = L'\0';
2272 		wlen--;
2273 	}
2274 
2275 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2276 	wline[i] = L'\0';
2277 
2278 	if (widthp)
2279 		*widthp = cols;
2280 	if (scrollxp)
2281 		*scrollxp = scrollx;
2282 	if (err)
2283 		free(wline);
2284 	else
2285 		*wlinep = wline;
2286 	return err;
2287 }
2288 
2289 static const struct got_error*
2290 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2291     struct got_object_id *id, struct got_repository *repo)
2292 {
2293 	static const struct got_error *err = NULL;
2294 	struct got_reflist_entry *re;
2295 	char *s;
2296 	const char *name;
2297 
2298 	*refs_str = NULL;
2299 
2300 	TAILQ_FOREACH(re, refs, entry) {
2301 		struct got_tag_object *tag = NULL;
2302 		struct got_object_id *ref_id;
2303 		int cmp;
2304 
2305 		name = got_ref_get_name(re->ref);
2306 		if (strcmp(name, GOT_REF_HEAD) == 0)
2307 			continue;
2308 		if (strncmp(name, "refs/", 5) == 0)
2309 			name += 5;
2310 		if (strncmp(name, "got/", 4) == 0 &&
2311 		    strncmp(name, "got/backup/", 11) != 0)
2312 			continue;
2313 		if (strncmp(name, "heads/", 6) == 0)
2314 			name += 6;
2315 		if (strncmp(name, "remotes/", 8) == 0) {
2316 			name += 8;
2317 			s = strstr(name, "/" GOT_REF_HEAD);
2318 			if (s != NULL && s[strlen(s)] == '\0')
2319 				continue;
2320 		}
2321 		err = got_ref_resolve(&ref_id, repo, re->ref);
2322 		if (err)
2323 			break;
2324 		if (strncmp(name, "tags/", 5) == 0) {
2325 			err = got_object_open_as_tag(&tag, repo, ref_id);
2326 			if (err) {
2327 				if (err->code != GOT_ERR_OBJ_TYPE) {
2328 					free(ref_id);
2329 					break;
2330 				}
2331 				/* Ref points at something other than a tag. */
2332 				err = NULL;
2333 				tag = NULL;
2334 			}
2335 		}
2336 		cmp = got_object_id_cmp(tag ?
2337 		    got_object_tag_get_object_id(tag) : ref_id, id);
2338 		free(ref_id);
2339 		if (tag)
2340 			got_object_tag_close(tag);
2341 		if (cmp != 0)
2342 			continue;
2343 		s = *refs_str;
2344 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2345 		    s ? ", " : "", name) == -1) {
2346 			err = got_error_from_errno("asprintf");
2347 			free(s);
2348 			*refs_str = NULL;
2349 			break;
2350 		}
2351 		free(s);
2352 	}
2353 
2354 	return err;
2355 }
2356 
2357 static const struct got_error *
2358 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2359     int col_tab_align)
2360 {
2361 	char *smallerthan;
2362 
2363 	smallerthan = strchr(author, '<');
2364 	if (smallerthan && smallerthan[1] != '\0')
2365 		author = smallerthan + 1;
2366 	author[strcspn(author, "@>")] = '\0';
2367 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2368 	    col_tab_align, 0);
2369 }
2370 
2371 static const struct got_error *
2372 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2373     struct got_object_id *id, const size_t date_display_cols,
2374     int author_display_cols)
2375 {
2376 	struct tog_log_view_state *s = &view->state.log;
2377 	const struct got_error *err = NULL;
2378 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2379 	char *logmsg0 = NULL, *logmsg = NULL;
2380 	char *author = NULL;
2381 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2382 	int author_width, logmsg_width;
2383 	char *newline, *line = NULL;
2384 	int col, limit, scrollx;
2385 	const int avail = view->ncols;
2386 	struct tm tm;
2387 	time_t committer_time;
2388 	struct tog_color *tc;
2389 
2390 	committer_time = got_object_commit_get_committer_time(commit);
2391 	if (gmtime_r(&committer_time, &tm) == NULL)
2392 		return got_error_from_errno("gmtime_r");
2393 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2394 		return got_error(GOT_ERR_NO_SPACE);
2395 
2396 	if (avail <= date_display_cols)
2397 		limit = MIN(sizeof(datebuf) - 1, avail);
2398 	else
2399 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2400 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2401 	if (tc)
2402 		wattr_on(view->window,
2403 		    COLOR_PAIR(tc->colorpair), NULL);
2404 	waddnstr(view->window, datebuf, limit);
2405 	if (tc)
2406 		wattr_off(view->window,
2407 		    COLOR_PAIR(tc->colorpair), NULL);
2408 	col = limit;
2409 	if (col > avail)
2410 		goto done;
2411 
2412 	if (avail >= 120) {
2413 		char *id_str;
2414 		err = got_object_id_str(&id_str, id);
2415 		if (err)
2416 			goto done;
2417 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2418 		if (tc)
2419 			wattr_on(view->window,
2420 			    COLOR_PAIR(tc->colorpair), NULL);
2421 		wprintw(view->window, "%.8s ", id_str);
2422 		if (tc)
2423 			wattr_off(view->window,
2424 			    COLOR_PAIR(tc->colorpair), NULL);
2425 		free(id_str);
2426 		col += 9;
2427 		if (col > avail)
2428 			goto done;
2429 	}
2430 
2431 	if (s->use_committer)
2432 		author = strdup(got_object_commit_get_committer(commit));
2433 	else
2434 		author = strdup(got_object_commit_get_author(commit));
2435 	if (author == NULL) {
2436 		err = got_error_from_errno("strdup");
2437 		goto done;
2438 	}
2439 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2440 	if (err)
2441 		goto done;
2442 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2443 	if (tc)
2444 		wattr_on(view->window,
2445 		    COLOR_PAIR(tc->colorpair), NULL);
2446 	waddwstr(view->window, wauthor);
2447 	col += author_width;
2448 	while (col < avail && author_width < author_display_cols + 2) {
2449 		waddch(view->window, ' ');
2450 		col++;
2451 		author_width++;
2452 	}
2453 	if (tc)
2454 		wattr_off(view->window,
2455 		    COLOR_PAIR(tc->colorpair), NULL);
2456 	if (col > avail)
2457 		goto done;
2458 
2459 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2460 	if (err)
2461 		goto done;
2462 	logmsg = logmsg0;
2463 	while (*logmsg == '\n')
2464 		logmsg++;
2465 	newline = strchr(logmsg, '\n');
2466 	if (newline)
2467 		*newline = '\0';
2468 	limit = avail - col;
2469 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2470 		limit--;	/* for the border */
2471 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2472 	    limit, col, 1);
2473 	if (err)
2474 		goto done;
2475 	waddwstr(view->window, &wlogmsg[scrollx]);
2476 	col += MAX(logmsg_width, 0);
2477 	while (col < avail) {
2478 		waddch(view->window, ' ');
2479 		col++;
2480 	}
2481 done:
2482 	free(logmsg0);
2483 	free(wlogmsg);
2484 	free(author);
2485 	free(wauthor);
2486 	free(line);
2487 	return err;
2488 }
2489 
2490 static struct commit_queue_entry *
2491 alloc_commit_queue_entry(struct got_commit_object *commit,
2492     struct got_object_id *id)
2493 {
2494 	struct commit_queue_entry *entry;
2495 	struct got_object_id *dup;
2496 
2497 	entry = calloc(1, sizeof(*entry));
2498 	if (entry == NULL)
2499 		return NULL;
2500 
2501 	dup = got_object_id_dup(id);
2502 	if (dup == NULL) {
2503 		free(entry);
2504 		return NULL;
2505 	}
2506 
2507 	entry->id = dup;
2508 	entry->commit = commit;
2509 	return entry;
2510 }
2511 
2512 static void
2513 pop_commit(struct commit_queue *commits)
2514 {
2515 	struct commit_queue_entry *entry;
2516 
2517 	entry = TAILQ_FIRST(&commits->head);
2518 	TAILQ_REMOVE(&commits->head, entry, entry);
2519 	got_object_commit_close(entry->commit);
2520 	commits->ncommits--;
2521 	free(entry->id);
2522 	free(entry);
2523 }
2524 
2525 static void
2526 free_commits(struct commit_queue *commits)
2527 {
2528 	while (!TAILQ_EMPTY(&commits->head))
2529 		pop_commit(commits);
2530 }
2531 
2532 static const struct got_error *
2533 match_commit(int *have_match, struct got_object_id *id,
2534     struct got_commit_object *commit, regex_t *regex)
2535 {
2536 	const struct got_error *err = NULL;
2537 	regmatch_t regmatch;
2538 	char *id_str = NULL, *logmsg = NULL;
2539 
2540 	*have_match = 0;
2541 
2542 	err = got_object_id_str(&id_str, id);
2543 	if (err)
2544 		return err;
2545 
2546 	err = got_object_commit_get_logmsg(&logmsg, commit);
2547 	if (err)
2548 		goto done;
2549 
2550 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2551 	    &regmatch, 0) == 0 ||
2552 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2553 	    &regmatch, 0) == 0 ||
2554 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2555 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2556 		*have_match = 1;
2557 done:
2558 	free(id_str);
2559 	free(logmsg);
2560 	return err;
2561 }
2562 
2563 static const struct got_error *
2564 queue_commits(struct tog_log_thread_args *a)
2565 {
2566 	const struct got_error *err = NULL;
2567 
2568 	/*
2569 	 * We keep all commits open throughout the lifetime of the log
2570 	 * view in order to avoid having to re-fetch commits from disk
2571 	 * while updating the display.
2572 	 */
2573 	do {
2574 		struct got_object_id id;
2575 		struct got_commit_object *commit;
2576 		struct commit_queue_entry *entry;
2577 		int limit_match = 0;
2578 		int errcode;
2579 
2580 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2581 		    NULL, NULL);
2582 		if (err)
2583 			break;
2584 
2585 		err = got_object_open_as_commit(&commit, a->repo, &id);
2586 		if (err)
2587 			break;
2588 		entry = alloc_commit_queue_entry(commit, &id);
2589 		if (entry == NULL) {
2590 			err = got_error_from_errno("alloc_commit_queue_entry");
2591 			break;
2592 		}
2593 
2594 		errcode = pthread_mutex_lock(&tog_mutex);
2595 		if (errcode) {
2596 			err = got_error_set_errno(errcode,
2597 			    "pthread_mutex_lock");
2598 			break;
2599 		}
2600 
2601 		entry->idx = a->real_commits->ncommits;
2602 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2603 		a->real_commits->ncommits++;
2604 
2605 		if (*a->limiting) {
2606 			err = match_commit(&limit_match, &id, commit,
2607 			    a->limit_regex);
2608 			if (err)
2609 				break;
2610 
2611 			if (limit_match) {
2612 				struct commit_queue_entry *matched;
2613 
2614 				matched = alloc_commit_queue_entry(
2615 				    entry->commit, entry->id);
2616 				if (matched == NULL) {
2617 					err = got_error_from_errno(
2618 					    "alloc_commit_queue_entry");
2619 					break;
2620 				}
2621 				matched->commit = entry->commit;
2622 				got_object_commit_retain(entry->commit);
2623 
2624 				matched->idx = a->limit_commits->ncommits;
2625 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2626 				    matched, entry);
2627 				a->limit_commits->ncommits++;
2628 			}
2629 
2630 			/*
2631 			 * This is how we signal log_thread() that we
2632 			 * have found a match, and that it should be
2633 			 * counted as a new entry for the view.
2634 			 */
2635 			a->limit_match = limit_match;
2636 		}
2637 
2638 		if (*a->searching == TOG_SEARCH_FORWARD &&
2639 		    !*a->search_next_done) {
2640 			int have_match;
2641 			err = match_commit(&have_match, &id, commit, a->regex);
2642 			if (err)
2643 				break;
2644 
2645 			if (*a->limiting) {
2646 				if (limit_match && have_match)
2647 					*a->search_next_done =
2648 					    TOG_SEARCH_HAVE_MORE;
2649 			} else if (have_match)
2650 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2651 		}
2652 
2653 		errcode = pthread_mutex_unlock(&tog_mutex);
2654 		if (errcode && err == NULL)
2655 			err = got_error_set_errno(errcode,
2656 			    "pthread_mutex_unlock");
2657 		if (err)
2658 			break;
2659 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2660 
2661 	return err;
2662 }
2663 
2664 static void
2665 select_commit(struct tog_log_view_state *s)
2666 {
2667 	struct commit_queue_entry *entry;
2668 	int ncommits = 0;
2669 
2670 	entry = s->first_displayed_entry;
2671 	while (entry) {
2672 		if (ncommits == s->selected) {
2673 			s->selected_entry = entry;
2674 			break;
2675 		}
2676 		entry = TAILQ_NEXT(entry, entry);
2677 		ncommits++;
2678 	}
2679 }
2680 
2681 static const struct got_error *
2682 draw_commits(struct tog_view *view)
2683 {
2684 	const struct got_error *err = NULL;
2685 	struct tog_log_view_state *s = &view->state.log;
2686 	struct commit_queue_entry *entry = s->selected_entry;
2687 	int limit = view->nlines;
2688 	int width;
2689 	int ncommits, author_cols = 4;
2690 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2691 	char *refs_str = NULL;
2692 	wchar_t *wline;
2693 	struct tog_color *tc;
2694 	static const size_t date_display_cols = 12;
2695 
2696 	if (view_is_hsplit_top(view))
2697 		--limit;  /* account for border */
2698 
2699 	if (s->selected_entry &&
2700 	    !(view->searching && view->search_next_done == 0)) {
2701 		struct got_reflist_head *refs;
2702 		err = got_object_id_str(&id_str, s->selected_entry->id);
2703 		if (err)
2704 			return err;
2705 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2706 		    s->selected_entry->id);
2707 		if (refs) {
2708 			err = build_refs_str(&refs_str, refs,
2709 			    s->selected_entry->id, s->repo);
2710 			if (err)
2711 				goto done;
2712 		}
2713 	}
2714 
2715 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2716 		halfdelay(10); /* disable fast refresh */
2717 
2718 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2719 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2720 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2721 		    (view->searching && !view->search_next_done) ?
2722 		    "searching..." : "loading...") == -1) {
2723 			err = got_error_from_errno("asprintf");
2724 			goto done;
2725 		}
2726 	} else {
2727 		const char *search_str = NULL;
2728 		const char *limit_str = NULL;
2729 
2730 		if (view->searching) {
2731 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2732 				search_str = "no more matches";
2733 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2734 				search_str = "no matches found";
2735 			else if (!view->search_next_done)
2736 				search_str = "searching...";
2737 		}
2738 
2739 		if (s->limit_view && s->commits->ncommits == 0)
2740 			limit_str = "no matches found";
2741 
2742 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2743 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2744 		    search_str ? search_str : (refs_str ? refs_str : ""),
2745 		    limit_str ? limit_str : "") == -1) {
2746 			err = got_error_from_errno("asprintf");
2747 			goto done;
2748 		}
2749 	}
2750 
2751 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2752 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2753 		    "........................................",
2754 		    s->in_repo_path, ncommits_str) == -1) {
2755 			err = got_error_from_errno("asprintf");
2756 			header = NULL;
2757 			goto done;
2758 		}
2759 	} else if (asprintf(&header, "commit %s%s",
2760 	    id_str ? id_str : "........................................",
2761 	    ncommits_str) == -1) {
2762 		err = got_error_from_errno("asprintf");
2763 		header = NULL;
2764 		goto done;
2765 	}
2766 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2767 	if (err)
2768 		goto done;
2769 
2770 	werase(view->window);
2771 
2772 	if (view_needs_focus_indication(view))
2773 		wstandout(view->window);
2774 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2775 	if (tc)
2776 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2777 	waddwstr(view->window, wline);
2778 	while (width < view->ncols) {
2779 		waddch(view->window, ' ');
2780 		width++;
2781 	}
2782 	if (tc)
2783 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2784 	if (view_needs_focus_indication(view))
2785 		wstandend(view->window);
2786 	free(wline);
2787 	if (limit <= 1)
2788 		goto done;
2789 
2790 	/* Grow author column size if necessary, and set view->maxx. */
2791 	entry = s->first_displayed_entry;
2792 	ncommits = 0;
2793 	view->maxx = 0;
2794 	while (entry) {
2795 		struct got_commit_object *c = entry->commit;
2796 		char *author, *eol, *msg, *msg0;
2797 		wchar_t *wauthor, *wmsg;
2798 		int width;
2799 		if (ncommits >= limit - 1)
2800 			break;
2801 		if (s->use_committer)
2802 			author = strdup(got_object_commit_get_committer(c));
2803 		else
2804 			author = strdup(got_object_commit_get_author(c));
2805 		if (author == NULL) {
2806 			err = got_error_from_errno("strdup");
2807 			goto done;
2808 		}
2809 		err = format_author(&wauthor, &width, author, COLS,
2810 		    date_display_cols);
2811 		if (author_cols < width)
2812 			author_cols = width;
2813 		free(wauthor);
2814 		free(author);
2815 		if (err)
2816 			goto done;
2817 		err = got_object_commit_get_logmsg(&msg0, c);
2818 		if (err)
2819 			goto done;
2820 		msg = msg0;
2821 		while (*msg == '\n')
2822 			++msg;
2823 		if ((eol = strchr(msg, '\n')))
2824 			*eol = '\0';
2825 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2826 		    date_display_cols + author_cols, 0);
2827 		if (err)
2828 			goto done;
2829 		view->maxx = MAX(view->maxx, width);
2830 		free(msg0);
2831 		free(wmsg);
2832 		ncommits++;
2833 		entry = TAILQ_NEXT(entry, entry);
2834 	}
2835 
2836 	entry = s->first_displayed_entry;
2837 	s->last_displayed_entry = s->first_displayed_entry;
2838 	ncommits = 0;
2839 	while (entry) {
2840 		if (ncommits >= limit - 1)
2841 			break;
2842 		if (ncommits == s->selected)
2843 			wstandout(view->window);
2844 		err = draw_commit(view, entry->commit, entry->id,
2845 		    date_display_cols, author_cols);
2846 		if (ncommits == s->selected)
2847 			wstandend(view->window);
2848 		if (err)
2849 			goto done;
2850 		ncommits++;
2851 		s->last_displayed_entry = entry;
2852 		entry = TAILQ_NEXT(entry, entry);
2853 	}
2854 
2855 	view_border(view);
2856 done:
2857 	free(id_str);
2858 	free(refs_str);
2859 	free(ncommits_str);
2860 	free(header);
2861 	return err;
2862 }
2863 
2864 static void
2865 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2866 {
2867 	struct commit_queue_entry *entry;
2868 	int nscrolled = 0;
2869 
2870 	entry = TAILQ_FIRST(&s->commits->head);
2871 	if (s->first_displayed_entry == entry)
2872 		return;
2873 
2874 	entry = s->first_displayed_entry;
2875 	while (entry && nscrolled < maxscroll) {
2876 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2877 		if (entry) {
2878 			s->first_displayed_entry = entry;
2879 			nscrolled++;
2880 		}
2881 	}
2882 }
2883 
2884 static const struct got_error *
2885 trigger_log_thread(struct tog_view *view, int wait)
2886 {
2887 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2888 	int errcode;
2889 
2890 	if (!using_mock_io)
2891 		halfdelay(1); /* fast refresh while loading commits */
2892 
2893 	while (!ta->log_complete && !tog_thread_error &&
2894 	    (ta->commits_needed > 0 || ta->load_all)) {
2895 		/* Wake the log thread. */
2896 		errcode = pthread_cond_signal(&ta->need_commits);
2897 		if (errcode)
2898 			return got_error_set_errno(errcode,
2899 			    "pthread_cond_signal");
2900 
2901 		/*
2902 		 * The mutex will be released while the view loop waits
2903 		 * in wgetch(), at which time the log thread will run.
2904 		 */
2905 		if (!wait)
2906 			break;
2907 
2908 		/* Display progress update in log view. */
2909 		show_log_view(view);
2910 		update_panels();
2911 		doupdate();
2912 
2913 		/* Wait right here while next commit is being loaded. */
2914 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2915 		if (errcode)
2916 			return got_error_set_errno(errcode,
2917 			    "pthread_cond_wait");
2918 
2919 		/* Display progress update in log view. */
2920 		show_log_view(view);
2921 		update_panels();
2922 		doupdate();
2923 	}
2924 
2925 	return NULL;
2926 }
2927 
2928 static const struct got_error *
2929 request_log_commits(struct tog_view *view)
2930 {
2931 	struct tog_log_view_state	*state = &view->state.log;
2932 	const struct got_error		*err = NULL;
2933 
2934 	if (state->thread_args.log_complete)
2935 		return NULL;
2936 
2937 	state->thread_args.commits_needed += view->nscrolled;
2938 	err = trigger_log_thread(view, 1);
2939 	view->nscrolled = 0;
2940 
2941 	return err;
2942 }
2943 
2944 static const struct got_error *
2945 log_scroll_down(struct tog_view *view, int maxscroll)
2946 {
2947 	struct tog_log_view_state *s = &view->state.log;
2948 	const struct got_error *err = NULL;
2949 	struct commit_queue_entry *pentry;
2950 	int nscrolled = 0, ncommits_needed;
2951 
2952 	if (s->last_displayed_entry == NULL)
2953 		return NULL;
2954 
2955 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2956 	if (s->commits->ncommits < ncommits_needed &&
2957 	    !s->thread_args.log_complete) {
2958 		/*
2959 		 * Ask the log thread for required amount of commits.
2960 		 */
2961 		s->thread_args.commits_needed +=
2962 		    ncommits_needed - s->commits->ncommits;
2963 		err = trigger_log_thread(view, 1);
2964 		if (err)
2965 			return err;
2966 	}
2967 
2968 	do {
2969 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2970 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2971 			break;
2972 
2973 		s->last_displayed_entry = pentry ?
2974 		    pentry : s->last_displayed_entry;
2975 
2976 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2977 		if (pentry == NULL)
2978 			break;
2979 		s->first_displayed_entry = pentry;
2980 	} while (++nscrolled < maxscroll);
2981 
2982 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2983 		view->nscrolled += nscrolled;
2984 	else
2985 		view->nscrolled = 0;
2986 
2987 	return err;
2988 }
2989 
2990 static const struct got_error *
2991 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2992     struct got_commit_object *commit, struct got_object_id *commit_id,
2993     struct tog_view *log_view, struct got_repository *repo)
2994 {
2995 	const struct got_error *err;
2996 	struct got_object_qid *parent_id;
2997 	struct tog_view *diff_view;
2998 
2999 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3000 	if (diff_view == NULL)
3001 		return got_error_from_errno("view_open");
3002 
3003 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3004 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3005 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3006 	if (err == NULL)
3007 		*new_view = diff_view;
3008 	return err;
3009 }
3010 
3011 static const struct got_error *
3012 tree_view_visit_subtree(struct tog_tree_view_state *s,
3013     struct got_tree_object *subtree)
3014 {
3015 	struct tog_parent_tree *parent;
3016 
3017 	parent = calloc(1, sizeof(*parent));
3018 	if (parent == NULL)
3019 		return got_error_from_errno("calloc");
3020 
3021 	parent->tree = s->tree;
3022 	parent->first_displayed_entry = s->first_displayed_entry;
3023 	parent->selected_entry = s->selected_entry;
3024 	parent->selected = s->selected;
3025 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3026 	s->tree = subtree;
3027 	s->selected = 0;
3028 	s->first_displayed_entry = NULL;
3029 	return NULL;
3030 }
3031 
3032 static const struct got_error *
3033 tree_view_walk_path(struct tog_tree_view_state *s,
3034     struct got_commit_object *commit, const char *path)
3035 {
3036 	const struct got_error *err = NULL;
3037 	struct got_tree_object *tree = NULL;
3038 	const char *p;
3039 	char *slash, *subpath = NULL;
3040 
3041 	/* Walk the path and open corresponding tree objects. */
3042 	p = path;
3043 	while (*p) {
3044 		struct got_tree_entry *te;
3045 		struct got_object_id *tree_id;
3046 		char *te_name;
3047 
3048 		while (p[0] == '/')
3049 			p++;
3050 
3051 		/* Ensure the correct subtree entry is selected. */
3052 		slash = strchr(p, '/');
3053 		if (slash == NULL)
3054 			te_name = strdup(p);
3055 		else
3056 			te_name = strndup(p, slash - p);
3057 		if (te_name == NULL) {
3058 			err = got_error_from_errno("strndup");
3059 			break;
3060 		}
3061 		te = got_object_tree_find_entry(s->tree, te_name);
3062 		if (te == NULL) {
3063 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3064 			free(te_name);
3065 			break;
3066 		}
3067 		free(te_name);
3068 		s->first_displayed_entry = s->selected_entry = te;
3069 
3070 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3071 			break; /* jump to this file's entry */
3072 
3073 		slash = strchr(p, '/');
3074 		if (slash)
3075 			subpath = strndup(path, slash - path);
3076 		else
3077 			subpath = strdup(path);
3078 		if (subpath == NULL) {
3079 			err = got_error_from_errno("strdup");
3080 			break;
3081 		}
3082 
3083 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3084 		    subpath);
3085 		if (err)
3086 			break;
3087 
3088 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3089 		free(tree_id);
3090 		if (err)
3091 			break;
3092 
3093 		err = tree_view_visit_subtree(s, tree);
3094 		if (err) {
3095 			got_object_tree_close(tree);
3096 			break;
3097 		}
3098 		if (slash == NULL)
3099 			break;
3100 		free(subpath);
3101 		subpath = NULL;
3102 		p = slash;
3103 	}
3104 
3105 	free(subpath);
3106 	return err;
3107 }
3108 
3109 static const struct got_error *
3110 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3111     struct commit_queue_entry *entry, const char *path,
3112     const char *head_ref_name, struct got_repository *repo)
3113 {
3114 	const struct got_error *err = NULL;
3115 	struct tog_tree_view_state *s;
3116 	struct tog_view *tree_view;
3117 
3118 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3119 	if (tree_view == NULL)
3120 		return got_error_from_errno("view_open");
3121 
3122 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3123 	if (err)
3124 		return err;
3125 	s = &tree_view->state.tree;
3126 
3127 	*new_view = tree_view;
3128 
3129 	if (got_path_is_root_dir(path))
3130 		return NULL;
3131 
3132 	return tree_view_walk_path(s, entry->commit, path);
3133 }
3134 
3135 static const struct got_error *
3136 block_signals_used_by_main_thread(void)
3137 {
3138 	sigset_t sigset;
3139 	int errcode;
3140 
3141 	if (sigemptyset(&sigset) == -1)
3142 		return got_error_from_errno("sigemptyset");
3143 
3144 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3145 	if (sigaddset(&sigset, SIGWINCH) == -1)
3146 		return got_error_from_errno("sigaddset");
3147 	if (sigaddset(&sigset, SIGCONT) == -1)
3148 		return got_error_from_errno("sigaddset");
3149 	if (sigaddset(&sigset, SIGINT) == -1)
3150 		return got_error_from_errno("sigaddset");
3151 	if (sigaddset(&sigset, SIGTERM) == -1)
3152 		return got_error_from_errno("sigaddset");
3153 
3154 	/* ncurses handles SIGTSTP */
3155 	if (sigaddset(&sigset, SIGTSTP) == -1)
3156 		return got_error_from_errno("sigaddset");
3157 
3158 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3159 	if (errcode)
3160 		return got_error_set_errno(errcode, "pthread_sigmask");
3161 
3162 	return NULL;
3163 }
3164 
3165 static void *
3166 log_thread(void *arg)
3167 {
3168 	const struct got_error *err = NULL;
3169 	int errcode = 0;
3170 	struct tog_log_thread_args *a = arg;
3171 	int done = 0;
3172 
3173 	/*
3174 	 * Sync startup with main thread such that we begin our
3175 	 * work once view_input() has released the mutex.
3176 	 */
3177 	errcode = pthread_mutex_lock(&tog_mutex);
3178 	if (errcode) {
3179 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3180 		return (void *)err;
3181 	}
3182 
3183 	err = block_signals_used_by_main_thread();
3184 	if (err) {
3185 		pthread_mutex_unlock(&tog_mutex);
3186 		goto done;
3187 	}
3188 
3189 	while (!done && !err && !tog_fatal_signal_received()) {
3190 		errcode = pthread_mutex_unlock(&tog_mutex);
3191 		if (errcode) {
3192 			err = got_error_set_errno(errcode,
3193 			    "pthread_mutex_unlock");
3194 			goto done;
3195 		}
3196 		err = queue_commits(a);
3197 		if (err) {
3198 			if (err->code != GOT_ERR_ITER_COMPLETED)
3199 				goto done;
3200 			err = NULL;
3201 			done = 1;
3202 		} else if (a->commits_needed > 0 && !a->load_all) {
3203 			if (*a->limiting) {
3204 				if (a->limit_match)
3205 					a->commits_needed--;
3206 			} else
3207 				a->commits_needed--;
3208 		}
3209 
3210 		errcode = pthread_mutex_lock(&tog_mutex);
3211 		if (errcode) {
3212 			err = got_error_set_errno(errcode,
3213 			    "pthread_mutex_lock");
3214 			goto done;
3215 		} else if (*a->quit)
3216 			done = 1;
3217 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3218 			*a->first_displayed_entry =
3219 			    TAILQ_FIRST(&a->limit_commits->head);
3220 			*a->selected_entry = *a->first_displayed_entry;
3221 		} else if (*a->first_displayed_entry == NULL) {
3222 			*a->first_displayed_entry =
3223 			    TAILQ_FIRST(&a->real_commits->head);
3224 			*a->selected_entry = *a->first_displayed_entry;
3225 		}
3226 
3227 		errcode = pthread_cond_signal(&a->commit_loaded);
3228 		if (errcode) {
3229 			err = got_error_set_errno(errcode,
3230 			    "pthread_cond_signal");
3231 			pthread_mutex_unlock(&tog_mutex);
3232 			goto done;
3233 		}
3234 
3235 		if (done)
3236 			a->commits_needed = 0;
3237 		else {
3238 			if (a->commits_needed == 0 && !a->load_all) {
3239 				errcode = pthread_cond_wait(&a->need_commits,
3240 				    &tog_mutex);
3241 				if (errcode) {
3242 					err = got_error_set_errno(errcode,
3243 					    "pthread_cond_wait");
3244 					pthread_mutex_unlock(&tog_mutex);
3245 					goto done;
3246 				}
3247 				if (*a->quit)
3248 					done = 1;
3249 			}
3250 		}
3251 	}
3252 	a->log_complete = 1;
3253 	errcode = pthread_mutex_unlock(&tog_mutex);
3254 	if (errcode)
3255 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3256 done:
3257 	if (err) {
3258 		tog_thread_error = 1;
3259 		pthread_cond_signal(&a->commit_loaded);
3260 	}
3261 	return (void *)err;
3262 }
3263 
3264 static const struct got_error *
3265 stop_log_thread(struct tog_log_view_state *s)
3266 {
3267 	const struct got_error *err = NULL, *thread_err = NULL;
3268 	int errcode;
3269 
3270 	if (s->thread) {
3271 		s->quit = 1;
3272 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3273 		if (errcode)
3274 			return got_error_set_errno(errcode,
3275 			    "pthread_cond_signal");
3276 		errcode = pthread_mutex_unlock(&tog_mutex);
3277 		if (errcode)
3278 			return got_error_set_errno(errcode,
3279 			    "pthread_mutex_unlock");
3280 		errcode = pthread_join(s->thread, (void **)&thread_err);
3281 		if (errcode)
3282 			return got_error_set_errno(errcode, "pthread_join");
3283 		errcode = pthread_mutex_lock(&tog_mutex);
3284 		if (errcode)
3285 			return got_error_set_errno(errcode,
3286 			    "pthread_mutex_lock");
3287 		s->thread = NULL;
3288 	}
3289 
3290 	if (s->thread_args.repo) {
3291 		err = got_repo_close(s->thread_args.repo);
3292 		s->thread_args.repo = NULL;
3293 	}
3294 
3295 	if (s->thread_args.pack_fds) {
3296 		const struct got_error *pack_err =
3297 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3298 		if (err == NULL)
3299 			err = pack_err;
3300 		s->thread_args.pack_fds = NULL;
3301 	}
3302 
3303 	if (s->thread_args.graph) {
3304 		got_commit_graph_close(s->thread_args.graph);
3305 		s->thread_args.graph = NULL;
3306 	}
3307 
3308 	return err ? err : thread_err;
3309 }
3310 
3311 static const struct got_error *
3312 close_log_view(struct tog_view *view)
3313 {
3314 	const struct got_error *err = NULL;
3315 	struct tog_log_view_state *s = &view->state.log;
3316 	int errcode;
3317 
3318 	err = stop_log_thread(s);
3319 
3320 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3321 	if (errcode && err == NULL)
3322 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3323 
3324 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3325 	if (errcode && err == NULL)
3326 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3327 
3328 	free_commits(&s->limit_commits);
3329 	free_commits(&s->real_commits);
3330 	free(s->in_repo_path);
3331 	s->in_repo_path = NULL;
3332 	free(s->start_id);
3333 	s->start_id = NULL;
3334 	free(s->head_ref_name);
3335 	s->head_ref_name = NULL;
3336 	return err;
3337 }
3338 
3339 /*
3340  * We use two queues to implement the limit feature: first consists of
3341  * commits matching the current limit_regex; second is the real queue
3342  * of all known commits (real_commits). When the user starts limiting,
3343  * we swap queues such that all movement and displaying functionality
3344  * works with very slight change.
3345  */
3346 static const struct got_error *
3347 limit_log_view(struct tog_view *view)
3348 {
3349 	struct tog_log_view_state *s = &view->state.log;
3350 	struct commit_queue_entry *entry;
3351 	struct tog_view	*v = view;
3352 	const struct got_error *err = NULL;
3353 	char pattern[1024];
3354 	int ret;
3355 
3356 	if (view_is_hsplit_top(view))
3357 		v = view->child;
3358 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3359 		v = view->parent;
3360 
3361 	/* Get the pattern */
3362 	wmove(v->window, v->nlines - 1, 0);
3363 	wclrtoeol(v->window);
3364 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3365 	nodelay(v->window, FALSE);
3366 	nocbreak();
3367 	echo();
3368 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3369 	cbreak();
3370 	noecho();
3371 	nodelay(v->window, TRUE);
3372 	if (ret == ERR)
3373 		return NULL;
3374 
3375 	if (*pattern == '\0') {
3376 		/*
3377 		 * Safety measure for the situation where the user
3378 		 * resets limit without previously limiting anything.
3379 		 */
3380 		if (!s->limit_view)
3381 			return NULL;
3382 
3383 		/*
3384 		 * User could have pressed Ctrl+L, which refreshed the
3385 		 * commit queues, it means we can't save previously
3386 		 * (before limit took place) displayed entries,
3387 		 * because they would point to already free'ed memory,
3388 		 * so we are forced to always select first entry of
3389 		 * the queue.
3390 		 */
3391 		s->commits = &s->real_commits;
3392 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3393 		s->selected_entry = s->first_displayed_entry;
3394 		s->selected = 0;
3395 		s->limit_view = 0;
3396 
3397 		return NULL;
3398 	}
3399 
3400 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3401 		return NULL;
3402 
3403 	s->limit_view = 1;
3404 
3405 	/* Clear the screen while loading limit view */
3406 	s->first_displayed_entry = NULL;
3407 	s->last_displayed_entry = NULL;
3408 	s->selected_entry = NULL;
3409 	s->commits = &s->limit_commits;
3410 
3411 	/* Prepare limit queue for new search */
3412 	free_commits(&s->limit_commits);
3413 	s->limit_commits.ncommits = 0;
3414 
3415 	/* First process commits, which are in queue already */
3416 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3417 		int have_match = 0;
3418 
3419 		err = match_commit(&have_match, entry->id,
3420 		    entry->commit, &s->limit_regex);
3421 		if (err)
3422 			return err;
3423 
3424 		if (have_match) {
3425 			struct commit_queue_entry *matched;
3426 
3427 			matched = alloc_commit_queue_entry(entry->commit,
3428 			    entry->id);
3429 			if (matched == NULL) {
3430 				err = got_error_from_errno(
3431 				    "alloc_commit_queue_entry");
3432 				break;
3433 			}
3434 			matched->commit = entry->commit;
3435 			got_object_commit_retain(entry->commit);
3436 
3437 			matched->idx = s->limit_commits.ncommits;
3438 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3439 			    matched, entry);
3440 			s->limit_commits.ncommits++;
3441 		}
3442 	}
3443 
3444 	/* Second process all the commits, until we fill the screen */
3445 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3446 	    !s->thread_args.log_complete) {
3447 		s->thread_args.commits_needed +=
3448 		    view->nlines - s->limit_commits.ncommits - 1;
3449 		err = trigger_log_thread(view, 1);
3450 		if (err)
3451 			return err;
3452 	}
3453 
3454 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3455 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3456 	s->selected = 0;
3457 
3458 	return NULL;
3459 }
3460 
3461 static const struct got_error *
3462 search_start_log_view(struct tog_view *view)
3463 {
3464 	struct tog_log_view_state *s = &view->state.log;
3465 
3466 	s->matched_entry = NULL;
3467 	s->search_entry = NULL;
3468 	return NULL;
3469 }
3470 
3471 static const struct got_error *
3472 search_next_log_view(struct tog_view *view)
3473 {
3474 	const struct got_error *err = NULL;
3475 	struct tog_log_view_state *s = &view->state.log;
3476 	struct commit_queue_entry *entry;
3477 
3478 	/* Display progress update in log view. */
3479 	show_log_view(view);
3480 	update_panels();
3481 	doupdate();
3482 
3483 	if (s->search_entry) {
3484 		int errcode, ch;
3485 		errcode = pthread_mutex_unlock(&tog_mutex);
3486 		if (errcode)
3487 			return got_error_set_errno(errcode,
3488 			    "pthread_mutex_unlock");
3489 		ch = wgetch(view->window);
3490 		errcode = pthread_mutex_lock(&tog_mutex);
3491 		if (errcode)
3492 			return got_error_set_errno(errcode,
3493 			    "pthread_mutex_lock");
3494 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3495 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3496 			return NULL;
3497 		}
3498 		if (view->searching == TOG_SEARCH_FORWARD)
3499 			entry = TAILQ_NEXT(s->search_entry, entry);
3500 		else
3501 			entry = TAILQ_PREV(s->search_entry,
3502 			    commit_queue_head, entry);
3503 	} else if (s->matched_entry) {
3504 		/*
3505 		 * If the user has moved the cursor after we hit a match,
3506 		 * the position from where we should continue searching
3507 		 * might have changed.
3508 		 */
3509 		if (view->searching == TOG_SEARCH_FORWARD)
3510 			entry = TAILQ_NEXT(s->selected_entry, entry);
3511 		else
3512 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3513 			    entry);
3514 	} else {
3515 		entry = s->selected_entry;
3516 	}
3517 
3518 	while (1) {
3519 		int have_match = 0;
3520 
3521 		if (entry == NULL) {
3522 			if (s->thread_args.log_complete ||
3523 			    view->searching == TOG_SEARCH_BACKWARD) {
3524 				view->search_next_done =
3525 				    (s->matched_entry == NULL ?
3526 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3527 				s->search_entry = NULL;
3528 				return NULL;
3529 			}
3530 			/*
3531 			 * Poke the log thread for more commits and return,
3532 			 * allowing the main loop to make progress. Search
3533 			 * will resume at s->search_entry once we come back.
3534 			 */
3535 			s->thread_args.commits_needed++;
3536 			return trigger_log_thread(view, 0);
3537 		}
3538 
3539 		err = match_commit(&have_match, entry->id, entry->commit,
3540 		    &view->regex);
3541 		if (err)
3542 			break;
3543 		if (have_match) {
3544 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3545 			s->matched_entry = entry;
3546 			break;
3547 		}
3548 
3549 		s->search_entry = entry;
3550 		if (view->searching == TOG_SEARCH_FORWARD)
3551 			entry = TAILQ_NEXT(entry, entry);
3552 		else
3553 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3554 	}
3555 
3556 	if (s->matched_entry) {
3557 		int cur = s->selected_entry->idx;
3558 		while (cur < s->matched_entry->idx) {
3559 			err = input_log_view(NULL, view, KEY_DOWN);
3560 			if (err)
3561 				return err;
3562 			cur++;
3563 		}
3564 		while (cur > s->matched_entry->idx) {
3565 			err = input_log_view(NULL, view, KEY_UP);
3566 			if (err)
3567 				return err;
3568 			cur--;
3569 		}
3570 	}
3571 
3572 	s->search_entry = NULL;
3573 
3574 	return NULL;
3575 }
3576 
3577 static const struct got_error *
3578 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3579     struct got_repository *repo, const char *head_ref_name,
3580     const char *in_repo_path, int log_branches)
3581 {
3582 	const struct got_error *err = NULL;
3583 	struct tog_log_view_state *s = &view->state.log;
3584 	struct got_repository *thread_repo = NULL;
3585 	struct got_commit_graph *thread_graph = NULL;
3586 	int errcode;
3587 
3588 	if (in_repo_path != s->in_repo_path) {
3589 		free(s->in_repo_path);
3590 		s->in_repo_path = strdup(in_repo_path);
3591 		if (s->in_repo_path == NULL)
3592 			return got_error_from_errno("strdup");
3593 	}
3594 
3595 	/* The commit queue only contains commits being displayed. */
3596 	TAILQ_INIT(&s->real_commits.head);
3597 	s->real_commits.ncommits = 0;
3598 	s->commits = &s->real_commits;
3599 
3600 	TAILQ_INIT(&s->limit_commits.head);
3601 	s->limit_view = 0;
3602 	s->limit_commits.ncommits = 0;
3603 
3604 	s->repo = repo;
3605 	if (head_ref_name) {
3606 		s->head_ref_name = strdup(head_ref_name);
3607 		if (s->head_ref_name == NULL) {
3608 			err = got_error_from_errno("strdup");
3609 			goto done;
3610 		}
3611 	}
3612 	s->start_id = got_object_id_dup(start_id);
3613 	if (s->start_id == NULL) {
3614 		err = got_error_from_errno("got_object_id_dup");
3615 		goto done;
3616 	}
3617 	s->log_branches = log_branches;
3618 	s->use_committer = 1;
3619 
3620 	STAILQ_INIT(&s->colors);
3621 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3622 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3623 		    get_color_value("TOG_COLOR_COMMIT"));
3624 		if (err)
3625 			goto done;
3626 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3627 		    get_color_value("TOG_COLOR_AUTHOR"));
3628 		if (err) {
3629 			free_colors(&s->colors);
3630 			goto done;
3631 		}
3632 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3633 		    get_color_value("TOG_COLOR_DATE"));
3634 		if (err) {
3635 			free_colors(&s->colors);
3636 			goto done;
3637 		}
3638 	}
3639 
3640 	view->show = show_log_view;
3641 	view->input = input_log_view;
3642 	view->resize = resize_log_view;
3643 	view->close = close_log_view;
3644 	view->search_start = search_start_log_view;
3645 	view->search_next = search_next_log_view;
3646 
3647 	if (s->thread_args.pack_fds == NULL) {
3648 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3649 		if (err)
3650 			goto done;
3651 	}
3652 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3653 	    s->thread_args.pack_fds);
3654 	if (err)
3655 		goto done;
3656 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3657 	    !s->log_branches);
3658 	if (err)
3659 		goto done;
3660 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3661 	    s->repo, NULL, NULL);
3662 	if (err)
3663 		goto done;
3664 
3665 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3666 	if (errcode) {
3667 		err = got_error_set_errno(errcode, "pthread_cond_init");
3668 		goto done;
3669 	}
3670 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3671 	if (errcode) {
3672 		err = got_error_set_errno(errcode, "pthread_cond_init");
3673 		goto done;
3674 	}
3675 
3676 	s->thread_args.commits_needed = view->nlines;
3677 	s->thread_args.graph = thread_graph;
3678 	s->thread_args.real_commits = &s->real_commits;
3679 	s->thread_args.limit_commits = &s->limit_commits;
3680 	s->thread_args.in_repo_path = s->in_repo_path;
3681 	s->thread_args.start_id = s->start_id;
3682 	s->thread_args.repo = thread_repo;
3683 	s->thread_args.log_complete = 0;
3684 	s->thread_args.quit = &s->quit;
3685 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3686 	s->thread_args.selected_entry = &s->selected_entry;
3687 	s->thread_args.searching = &view->searching;
3688 	s->thread_args.search_next_done = &view->search_next_done;
3689 	s->thread_args.regex = &view->regex;
3690 	s->thread_args.limiting = &s->limit_view;
3691 	s->thread_args.limit_regex = &s->limit_regex;
3692 	s->thread_args.limit_commits = &s->limit_commits;
3693 done:
3694 	if (err)
3695 		close_log_view(view);
3696 	return err;
3697 }
3698 
3699 static const struct got_error *
3700 show_log_view(struct tog_view *view)
3701 {
3702 	const struct got_error *err;
3703 	struct tog_log_view_state *s = &view->state.log;
3704 
3705 	if (s->thread == NULL) {
3706 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3707 		    &s->thread_args);
3708 		if (errcode)
3709 			return got_error_set_errno(errcode, "pthread_create");
3710 		if (s->thread_args.commits_needed > 0) {
3711 			err = trigger_log_thread(view, 1);
3712 			if (err)
3713 				return err;
3714 		}
3715 	}
3716 
3717 	return draw_commits(view);
3718 }
3719 
3720 static void
3721 log_move_cursor_up(struct tog_view *view, int page, int home)
3722 {
3723 	struct tog_log_view_state *s = &view->state.log;
3724 
3725 	if (s->first_displayed_entry == NULL)
3726 		return;
3727 	if (s->selected_entry->idx == 0)
3728 		view->count = 0;
3729 
3730 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3731 	    || home)
3732 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3733 
3734 	if (!page && !home && s->selected > 0)
3735 		--s->selected;
3736 	else
3737 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3738 
3739 	select_commit(s);
3740 	return;
3741 }
3742 
3743 static const struct got_error *
3744 log_move_cursor_down(struct tog_view *view, int page)
3745 {
3746 	struct tog_log_view_state	*s = &view->state.log;
3747 	const struct got_error		*err = NULL;
3748 	int				 eos = view->nlines - 2;
3749 
3750 	if (s->first_displayed_entry == NULL)
3751 		return NULL;
3752 
3753 	if (s->thread_args.log_complete &&
3754 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3755 		return NULL;
3756 
3757 	if (view_is_hsplit_top(view))
3758 		--eos;  /* border consumes the last line */
3759 
3760 	if (!page) {
3761 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3762 			++s->selected;
3763 		else
3764 			err = log_scroll_down(view, 1);
3765 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3766 		struct commit_queue_entry *entry;
3767 		int n;
3768 
3769 		s->selected = 0;
3770 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3771 		s->last_displayed_entry = entry;
3772 		for (n = 0; n <= eos; n++) {
3773 			if (entry == NULL)
3774 				break;
3775 			s->first_displayed_entry = entry;
3776 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3777 		}
3778 		if (n > 0)
3779 			s->selected = n - 1;
3780 	} else {
3781 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3782 		    s->thread_args.log_complete)
3783 			s->selected += MIN(page,
3784 			    s->commits->ncommits - s->selected_entry->idx - 1);
3785 		else
3786 			err = log_scroll_down(view, page);
3787 	}
3788 	if (err)
3789 		return err;
3790 
3791 	/*
3792 	 * We might necessarily overshoot in horizontal
3793 	 * splits; if so, select the last displayed commit.
3794 	 */
3795 	if (s->first_displayed_entry && s->last_displayed_entry) {
3796 		s->selected = MIN(s->selected,
3797 		    s->last_displayed_entry->idx -
3798 		    s->first_displayed_entry->idx);
3799 	}
3800 
3801 	select_commit(s);
3802 
3803 	if (s->thread_args.log_complete &&
3804 	    s->selected_entry->idx == s->commits->ncommits - 1)
3805 		view->count = 0;
3806 
3807 	return NULL;
3808 }
3809 
3810 static void
3811 view_get_split(struct tog_view *view, int *y, int *x)
3812 {
3813 	*x = 0;
3814 	*y = 0;
3815 
3816 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3817 		if (view->child && view->child->resized_y)
3818 			*y = view->child->resized_y;
3819 		else if (view->resized_y)
3820 			*y = view->resized_y;
3821 		else
3822 			*y = view_split_begin_y(view->lines);
3823 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3824 		if (view->child && view->child->resized_x)
3825 			*x = view->child->resized_x;
3826 		else if (view->resized_x)
3827 			*x = view->resized_x;
3828 		else
3829 			*x = view_split_begin_x(view->begin_x);
3830 	}
3831 }
3832 
3833 /* Split view horizontally at y and offset view->state->selected line. */
3834 static const struct got_error *
3835 view_init_hsplit(struct tog_view *view, int y)
3836 {
3837 	const struct got_error *err = NULL;
3838 
3839 	view->nlines = y;
3840 	view->ncols = COLS;
3841 	err = view_resize(view);
3842 	if (err)
3843 		return err;
3844 
3845 	err = offset_selection_down(view);
3846 
3847 	return err;
3848 }
3849 
3850 static const struct got_error *
3851 log_goto_line(struct tog_view *view, int nlines)
3852 {
3853 	const struct got_error		*err = NULL;
3854 	struct tog_log_view_state	*s = &view->state.log;
3855 	int				 g, idx = s->selected_entry->idx;
3856 
3857 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3858 		return NULL;
3859 
3860 	g = view->gline;
3861 	view->gline = 0;
3862 
3863 	if (g >= s->first_displayed_entry->idx + 1 &&
3864 	    g <= s->last_displayed_entry->idx + 1 &&
3865 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3866 		s->selected = g - s->first_displayed_entry->idx - 1;
3867 		select_commit(s);
3868 		return NULL;
3869 	}
3870 
3871 	if (idx + 1 < g) {
3872 		err = log_move_cursor_down(view, g - idx - 1);
3873 		if (!err && g > s->selected_entry->idx + 1)
3874 			err = log_move_cursor_down(view,
3875 			    g - s->first_displayed_entry->idx - 1);
3876 		if (err)
3877 			return err;
3878 	} else if (idx + 1 > g)
3879 		log_move_cursor_up(view, idx - g + 1, 0);
3880 
3881 	if (g < nlines && s->first_displayed_entry->idx == 0)
3882 		s->selected = g - 1;
3883 
3884 	select_commit(s);
3885 	return NULL;
3886 
3887 }
3888 
3889 static void
3890 horizontal_scroll_input(struct tog_view *view, int ch)
3891 {
3892 
3893 	switch (ch) {
3894 	case KEY_LEFT:
3895 	case 'h':
3896 		view->x -= MIN(view->x, 2);
3897 		if (view->x <= 0)
3898 			view->count = 0;
3899 		break;
3900 	case KEY_RIGHT:
3901 	case 'l':
3902 		if (view->x + view->ncols / 2 < view->maxx)
3903 			view->x += 2;
3904 		else
3905 			view->count = 0;
3906 		break;
3907 	case '0':
3908 		view->x = 0;
3909 		break;
3910 	case '$':
3911 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3912 		view->count = 0;
3913 		break;
3914 	default:
3915 		break;
3916 	}
3917 }
3918 
3919 static const struct got_error *
3920 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3921 {
3922 	const struct got_error *err = NULL;
3923 	struct tog_log_view_state *s = &view->state.log;
3924 	int eos, nscroll;
3925 
3926 	if (s->thread_args.load_all) {
3927 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3928 			s->thread_args.load_all = 0;
3929 		else if (s->thread_args.log_complete) {
3930 			err = log_move_cursor_down(view, s->commits->ncommits);
3931 			s->thread_args.load_all = 0;
3932 		}
3933 		if (err)
3934 			return err;
3935 	}
3936 
3937 	eos = nscroll = view->nlines - 1;
3938 	if (view_is_hsplit_top(view))
3939 		--eos;  /* border */
3940 
3941 	if (view->gline)
3942 		return log_goto_line(view, eos);
3943 
3944 	switch (ch) {
3945 	case '&':
3946 		err = limit_log_view(view);
3947 		break;
3948 	case 'q':
3949 		s->quit = 1;
3950 		break;
3951 	case '0':
3952 	case '$':
3953 	case KEY_RIGHT:
3954 	case 'l':
3955 	case KEY_LEFT:
3956 	case 'h':
3957 		horizontal_scroll_input(view, ch);
3958 		break;
3959 	case 'k':
3960 	case KEY_UP:
3961 	case '<':
3962 	case ',':
3963 	case CTRL('p'):
3964 		log_move_cursor_up(view, 0, 0);
3965 		break;
3966 	case 'g':
3967 	case '=':
3968 	case KEY_HOME:
3969 		log_move_cursor_up(view, 0, 1);
3970 		view->count = 0;
3971 		break;
3972 	case CTRL('u'):
3973 	case 'u':
3974 		nscroll /= 2;
3975 		/* FALL THROUGH */
3976 	case KEY_PPAGE:
3977 	case CTRL('b'):
3978 	case 'b':
3979 		log_move_cursor_up(view, nscroll, 0);
3980 		break;
3981 	case 'j':
3982 	case KEY_DOWN:
3983 	case '>':
3984 	case '.':
3985 	case CTRL('n'):
3986 		err = log_move_cursor_down(view, 0);
3987 		break;
3988 	case '@':
3989 		s->use_committer = !s->use_committer;
3990 		view->action = s->use_committer ?
3991 		    "show committer" : "show commit author";
3992 		break;
3993 	case 'G':
3994 	case '*':
3995 	case KEY_END: {
3996 		/* We don't know yet how many commits, so we're forced to
3997 		 * traverse them all. */
3998 		view->count = 0;
3999 		s->thread_args.load_all = 1;
4000 		if (!s->thread_args.log_complete)
4001 			return trigger_log_thread(view, 0);
4002 		err = log_move_cursor_down(view, s->commits->ncommits);
4003 		s->thread_args.load_all = 0;
4004 		break;
4005 	}
4006 	case CTRL('d'):
4007 	case 'd':
4008 		nscroll /= 2;
4009 		/* FALL THROUGH */
4010 	case KEY_NPAGE:
4011 	case CTRL('f'):
4012 	case 'f':
4013 	case ' ':
4014 		err = log_move_cursor_down(view, nscroll);
4015 		break;
4016 	case KEY_RESIZE:
4017 		if (s->selected > view->nlines - 2)
4018 			s->selected = view->nlines - 2;
4019 		if (s->selected > s->commits->ncommits - 1)
4020 			s->selected = s->commits->ncommits - 1;
4021 		select_commit(s);
4022 		if (s->commits->ncommits < view->nlines - 1 &&
4023 		    !s->thread_args.log_complete) {
4024 			s->thread_args.commits_needed += (view->nlines - 1) -
4025 			    s->commits->ncommits;
4026 			err = trigger_log_thread(view, 1);
4027 		}
4028 		break;
4029 	case KEY_ENTER:
4030 	case '\r':
4031 		view->count = 0;
4032 		if (s->selected_entry == NULL)
4033 			break;
4034 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4035 		break;
4036 	case 'T':
4037 		view->count = 0;
4038 		if (s->selected_entry == NULL)
4039 			break;
4040 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4041 		break;
4042 	case KEY_BACKSPACE:
4043 	case CTRL('l'):
4044 	case 'B':
4045 		view->count = 0;
4046 		if (ch == KEY_BACKSPACE &&
4047 		    got_path_is_root_dir(s->in_repo_path))
4048 			break;
4049 		err = stop_log_thread(s);
4050 		if (err)
4051 			return err;
4052 		if (ch == KEY_BACKSPACE) {
4053 			char *parent_path;
4054 			err = got_path_dirname(&parent_path, s->in_repo_path);
4055 			if (err)
4056 				return err;
4057 			free(s->in_repo_path);
4058 			s->in_repo_path = parent_path;
4059 			s->thread_args.in_repo_path = s->in_repo_path;
4060 		} else if (ch == CTRL('l')) {
4061 			struct got_object_id *start_id;
4062 			err = got_repo_match_object_id(&start_id, NULL,
4063 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4064 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4065 			if (err) {
4066 				if (s->head_ref_name == NULL ||
4067 				    err->code != GOT_ERR_NOT_REF)
4068 					return err;
4069 				/* Try to cope with deleted references. */
4070 				free(s->head_ref_name);
4071 				s->head_ref_name = NULL;
4072 				err = got_repo_match_object_id(&start_id,
4073 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4074 				    &tog_refs, s->repo);
4075 				if (err)
4076 					return err;
4077 			}
4078 			free(s->start_id);
4079 			s->start_id = start_id;
4080 			s->thread_args.start_id = s->start_id;
4081 		} else /* 'B' */
4082 			s->log_branches = !s->log_branches;
4083 
4084 		if (s->thread_args.pack_fds == NULL) {
4085 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4086 			if (err)
4087 				return err;
4088 		}
4089 		err = got_repo_open(&s->thread_args.repo,
4090 		    got_repo_get_path(s->repo), NULL,
4091 		    s->thread_args.pack_fds);
4092 		if (err)
4093 			return err;
4094 		tog_free_refs();
4095 		err = tog_load_refs(s->repo, 0);
4096 		if (err)
4097 			return err;
4098 		err = got_commit_graph_open(&s->thread_args.graph,
4099 		    s->in_repo_path, !s->log_branches);
4100 		if (err)
4101 			return err;
4102 		err = got_commit_graph_iter_start(s->thread_args.graph,
4103 		    s->start_id, s->repo, NULL, NULL);
4104 		if (err)
4105 			return err;
4106 		free_commits(&s->real_commits);
4107 		free_commits(&s->limit_commits);
4108 		s->first_displayed_entry = NULL;
4109 		s->last_displayed_entry = NULL;
4110 		s->selected_entry = NULL;
4111 		s->selected = 0;
4112 		s->thread_args.log_complete = 0;
4113 		s->quit = 0;
4114 		s->thread_args.commits_needed = view->lines;
4115 		s->matched_entry = NULL;
4116 		s->search_entry = NULL;
4117 		view->offset = 0;
4118 		break;
4119 	case 'R':
4120 		view->count = 0;
4121 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4122 		break;
4123 	default:
4124 		view->count = 0;
4125 		break;
4126 	}
4127 
4128 	return err;
4129 }
4130 
4131 static const struct got_error *
4132 apply_unveil(const char *repo_path, const char *worktree_path)
4133 {
4134 	const struct got_error *error;
4135 
4136 #ifdef PROFILE
4137 	if (unveil("gmon.out", "rwc") != 0)
4138 		return got_error_from_errno2("unveil", "gmon.out");
4139 #endif
4140 	if (repo_path && unveil(repo_path, "r") != 0)
4141 		return got_error_from_errno2("unveil", repo_path);
4142 
4143 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4144 		return got_error_from_errno2("unveil", worktree_path);
4145 
4146 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4147 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4148 
4149 	error = got_privsep_unveil_exec_helpers();
4150 	if (error != NULL)
4151 		return error;
4152 
4153 	if (unveil(NULL, NULL) != 0)
4154 		return got_error_from_errno("unveil");
4155 
4156 	return NULL;
4157 }
4158 
4159 static const struct got_error *
4160 init_mock_term(const char *test_script_path)
4161 {
4162 	const struct got_error	*err = NULL;
4163 
4164 	if (test_script_path == NULL || *test_script_path == '\0')
4165 		return got_error_msg(GOT_ERR_IO, "GOT_TOG_TEST not defined");
4166 
4167 	tog_io.f = fopen(test_script_path, "re");
4168 	if (tog_io.f == NULL) {
4169 		err = got_error_from_errno_fmt("fopen: %s",
4170 		    test_script_path);
4171 		goto done;
4172 	}
4173 
4174 	/* test mode, we don't want any output */
4175 	tog_io.cout = fopen("/dev/null", "w+");
4176 	if (tog_io.cout == NULL) {
4177 		err = got_error_from_errno("fopen: /dev/null");
4178 		goto done;
4179 	}
4180 
4181 	tog_io.cin = fopen("/dev/tty", "r+");
4182 	if (tog_io.cin == NULL) {
4183 		err = got_error_from_errno("fopen: /dev/tty");
4184 		goto done;
4185 	}
4186 
4187 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4188 		err = got_error_from_errno("fseeko");
4189 		goto done;
4190 	}
4191 
4192 	/* use local TERM so we test in different environments */
4193 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4194 		err = got_error_msg(GOT_ERR_IO,
4195 		    "newterm: failed to initialise curses");
4196 
4197 	using_mock_io = 1;
4198 done:
4199 	if (err)
4200 		tog_io_close();
4201 	return err;
4202 }
4203 
4204 static void
4205 init_curses(void)
4206 {
4207 	/*
4208 	 * Override default signal handlers before starting ncurses.
4209 	 * This should prevent ncurses from installing its own
4210 	 * broken cleanup() signal handler.
4211 	 */
4212 	signal(SIGWINCH, tog_sigwinch);
4213 	signal(SIGPIPE, tog_sigpipe);
4214 	signal(SIGCONT, tog_sigcont);
4215 	signal(SIGINT, tog_sigint);
4216 	signal(SIGTERM, tog_sigterm);
4217 
4218 	if (using_mock_io) /* In test mode we use a fake terminal */
4219 		return;
4220 
4221 	initscr();
4222 
4223 	cbreak();
4224 	halfdelay(1); /* Fast refresh while initial view is loading. */
4225 	noecho();
4226 	nonl();
4227 	intrflush(stdscr, FALSE);
4228 	keypad(stdscr, TRUE);
4229 	curs_set(0);
4230 	if (getenv("TOG_COLORS") != NULL) {
4231 		start_color();
4232 		use_default_colors();
4233 	}
4234 
4235 	return;
4236 }
4237 
4238 static const struct got_error *
4239 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4240     struct got_repository *repo, struct got_worktree *worktree)
4241 {
4242 	const struct got_error *err = NULL;
4243 
4244 	if (argc == 0) {
4245 		*in_repo_path = strdup("/");
4246 		if (*in_repo_path == NULL)
4247 			return got_error_from_errno("strdup");
4248 		return NULL;
4249 	}
4250 
4251 	if (worktree) {
4252 		const char *prefix = got_worktree_get_path_prefix(worktree);
4253 		char *p;
4254 
4255 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4256 		if (err)
4257 			return err;
4258 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4259 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4260 		    p) == -1) {
4261 			err = got_error_from_errno("asprintf");
4262 			*in_repo_path = NULL;
4263 		}
4264 		free(p);
4265 	} else
4266 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4267 
4268 	return err;
4269 }
4270 
4271 static const struct got_error *
4272 cmd_log(int argc, char *argv[])
4273 {
4274 	const struct got_error *error;
4275 	struct got_repository *repo = NULL;
4276 	struct got_worktree *worktree = NULL;
4277 	struct got_object_id *start_id = NULL;
4278 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4279 	char *start_commit = NULL, *label = NULL;
4280 	struct got_reference *ref = NULL;
4281 	const char *head_ref_name = NULL;
4282 	int ch, log_branches = 0;
4283 	struct tog_view *view;
4284 	int *pack_fds = NULL;
4285 
4286 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4287 		switch (ch) {
4288 		case 'b':
4289 			log_branches = 1;
4290 			break;
4291 		case 'c':
4292 			start_commit = optarg;
4293 			break;
4294 		case 'r':
4295 			repo_path = realpath(optarg, NULL);
4296 			if (repo_path == NULL)
4297 				return got_error_from_errno2("realpath",
4298 				    optarg);
4299 			break;
4300 		default:
4301 			usage_log();
4302 			/* NOTREACHED */
4303 		}
4304 	}
4305 
4306 	argc -= optind;
4307 	argv += optind;
4308 
4309 	if (argc > 1)
4310 		usage_log();
4311 
4312 	error = got_repo_pack_fds_open(&pack_fds);
4313 	if (error != NULL)
4314 		goto done;
4315 
4316 	if (repo_path == NULL) {
4317 		cwd = getcwd(NULL, 0);
4318 		if (cwd == NULL)
4319 			return got_error_from_errno("getcwd");
4320 		error = got_worktree_open(&worktree, cwd);
4321 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4322 			goto done;
4323 		if (worktree)
4324 			repo_path =
4325 			    strdup(got_worktree_get_repo_path(worktree));
4326 		else
4327 			repo_path = strdup(cwd);
4328 		if (repo_path == NULL) {
4329 			error = got_error_from_errno("strdup");
4330 			goto done;
4331 		}
4332 	}
4333 
4334 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4335 	if (error != NULL)
4336 		goto done;
4337 
4338 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4339 	    repo, worktree);
4340 	if (error)
4341 		goto done;
4342 
4343 	init_curses();
4344 
4345 	error = apply_unveil(got_repo_get_path(repo),
4346 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4347 	if (error)
4348 		goto done;
4349 
4350 	/* already loaded by tog_log_with_path()? */
4351 	if (TAILQ_EMPTY(&tog_refs)) {
4352 		error = tog_load_refs(repo, 0);
4353 		if (error)
4354 			goto done;
4355 	}
4356 
4357 	if (start_commit == NULL) {
4358 		error = got_repo_match_object_id(&start_id, &label,
4359 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4360 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4361 		if (error)
4362 			goto done;
4363 		head_ref_name = label;
4364 	} else {
4365 		error = got_ref_open(&ref, repo, start_commit, 0);
4366 		if (error == NULL)
4367 			head_ref_name = got_ref_get_name(ref);
4368 		else if (error->code != GOT_ERR_NOT_REF)
4369 			goto done;
4370 		error = got_repo_match_object_id(&start_id, NULL,
4371 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4372 		if (error)
4373 			goto done;
4374 	}
4375 
4376 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4377 	if (view == NULL) {
4378 		error = got_error_from_errno("view_open");
4379 		goto done;
4380 	}
4381 	error = open_log_view(view, start_id, repo, head_ref_name,
4382 	    in_repo_path, log_branches);
4383 	if (error)
4384 		goto done;
4385 	if (worktree) {
4386 		/* Release work tree lock. */
4387 		got_worktree_close(worktree);
4388 		worktree = NULL;
4389 	}
4390 	error = view_loop(view);
4391 done:
4392 	free(in_repo_path);
4393 	free(repo_path);
4394 	free(cwd);
4395 	free(start_id);
4396 	free(label);
4397 	if (ref)
4398 		got_ref_close(ref);
4399 	if (repo) {
4400 		const struct got_error *close_err = got_repo_close(repo);
4401 		if (error == NULL)
4402 			error = close_err;
4403 	}
4404 	if (worktree)
4405 		got_worktree_close(worktree);
4406 	if (pack_fds) {
4407 		const struct got_error *pack_err =
4408 		    got_repo_pack_fds_close(pack_fds);
4409 		if (error == NULL)
4410 			error = pack_err;
4411 	}
4412 	tog_free_refs();
4413 	return error;
4414 }
4415 
4416 __dead static void
4417 usage_diff(void)
4418 {
4419 	endwin();
4420 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4421 	    "object1 object2\n", getprogname());
4422 	exit(1);
4423 }
4424 
4425 static int
4426 match_line(const char *line, regex_t *regex, size_t nmatch,
4427     regmatch_t *regmatch)
4428 {
4429 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4430 }
4431 
4432 static struct tog_color *
4433 match_color(struct tog_colors *colors, const char *line)
4434 {
4435 	struct tog_color *tc = NULL;
4436 
4437 	STAILQ_FOREACH(tc, colors, entry) {
4438 		if (match_line(line, &tc->regex, 0, NULL))
4439 			return tc;
4440 	}
4441 
4442 	return NULL;
4443 }
4444 
4445 static const struct got_error *
4446 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4447     WINDOW *window, int skipcol, regmatch_t *regmatch)
4448 {
4449 	const struct got_error *err = NULL;
4450 	char *exstr = NULL;
4451 	wchar_t *wline = NULL;
4452 	int rme, rms, n, width, scrollx;
4453 	int width0 = 0, width1 = 0, width2 = 0;
4454 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4455 
4456 	*wtotal = 0;
4457 
4458 	rms = regmatch->rm_so;
4459 	rme = regmatch->rm_eo;
4460 
4461 	err = expand_tab(&exstr, line);
4462 	if (err)
4463 		return err;
4464 
4465 	/* Split the line into 3 segments, according to match offsets. */
4466 	seg0 = strndup(exstr, rms);
4467 	if (seg0 == NULL) {
4468 		err = got_error_from_errno("strndup");
4469 		goto done;
4470 	}
4471 	seg1 = strndup(exstr + rms, rme - rms);
4472 	if (seg1 == NULL) {
4473 		err = got_error_from_errno("strndup");
4474 		goto done;
4475 	}
4476 	seg2 = strdup(exstr + rme);
4477 	if (seg2 == NULL) {
4478 		err = got_error_from_errno("strndup");
4479 		goto done;
4480 	}
4481 
4482 	/* draw up to matched token if we haven't scrolled past it */
4483 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4484 	    col_tab_align, 1);
4485 	if (err)
4486 		goto done;
4487 	n = MAX(width0 - skipcol, 0);
4488 	if (n) {
4489 		free(wline);
4490 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4491 		    wlimit, col_tab_align, 1);
4492 		if (err)
4493 			goto done;
4494 		waddwstr(window, &wline[scrollx]);
4495 		wlimit -= width;
4496 		*wtotal += width;
4497 	}
4498 
4499 	if (wlimit > 0) {
4500 		int i = 0, w = 0;
4501 		size_t wlen;
4502 
4503 		free(wline);
4504 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4505 		    col_tab_align, 1);
4506 		if (err)
4507 			goto done;
4508 		wlen = wcslen(wline);
4509 		while (i < wlen) {
4510 			width = wcwidth(wline[i]);
4511 			if (width == -1) {
4512 				/* should not happen, tabs are expanded */
4513 				err = got_error(GOT_ERR_RANGE);
4514 				goto done;
4515 			}
4516 			if (width0 + w + width > skipcol)
4517 				break;
4518 			w += width;
4519 			i++;
4520 		}
4521 		/* draw (visible part of) matched token (if scrolled into it) */
4522 		if (width1 - w > 0) {
4523 			wattron(window, A_STANDOUT);
4524 			waddwstr(window, &wline[i]);
4525 			wattroff(window, A_STANDOUT);
4526 			wlimit -= (width1 - w);
4527 			*wtotal += (width1 - w);
4528 		}
4529 	}
4530 
4531 	if (wlimit > 0) {  /* draw rest of line */
4532 		free(wline);
4533 		if (skipcol > width0 + width1) {
4534 			err = format_line(&wline, &width2, &scrollx, seg2,
4535 			    skipcol - (width0 + width1), wlimit,
4536 			    col_tab_align, 1);
4537 			if (err)
4538 				goto done;
4539 			waddwstr(window, &wline[scrollx]);
4540 		} else {
4541 			err = format_line(&wline, &width2, NULL, seg2, 0,
4542 			    wlimit, col_tab_align, 1);
4543 			if (err)
4544 				goto done;
4545 			waddwstr(window, wline);
4546 		}
4547 		*wtotal += width2;
4548 	}
4549 done:
4550 	free(wline);
4551 	free(exstr);
4552 	free(seg0);
4553 	free(seg1);
4554 	free(seg2);
4555 	return err;
4556 }
4557 
4558 static int
4559 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4560 {
4561 	FILE	*f = NULL;
4562 	int	*eof, *first, *selected;
4563 
4564 	if (view->type == TOG_VIEW_DIFF) {
4565 		struct tog_diff_view_state *s = &view->state.diff;
4566 
4567 		first = &s->first_displayed_line;
4568 		selected = first;
4569 		eof = &s->eof;
4570 		f = s->f;
4571 	} else if (view->type == TOG_VIEW_HELP) {
4572 		struct tog_help_view_state *s = &view->state.help;
4573 
4574 		first = &s->first_displayed_line;
4575 		selected = first;
4576 		eof = &s->eof;
4577 		f = s->f;
4578 	} else if (view->type == TOG_VIEW_BLAME) {
4579 		struct tog_blame_view_state *s = &view->state.blame;
4580 
4581 		first = &s->first_displayed_line;
4582 		selected = &s->selected_line;
4583 		eof = &s->eof;
4584 		f = s->blame.f;
4585 	} else
4586 		return 0;
4587 
4588 	/* Center gline in the middle of the page like vi(1). */
4589 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4590 		return 0;
4591 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4592 		rewind(f);
4593 		*eof = 0;
4594 		*first = 1;
4595 		*lineno = 0;
4596 		*nprinted = 0;
4597 		return 0;
4598 	}
4599 
4600 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4601 		view->gline : (view->nlines - 3) / 2 + 1;
4602 	view->gline = 0;
4603 
4604 	return 1;
4605 }
4606 
4607 static const struct got_error *
4608 draw_file(struct tog_view *view, const char *header)
4609 {
4610 	struct tog_diff_view_state *s = &view->state.diff;
4611 	regmatch_t *regmatch = &view->regmatch;
4612 	const struct got_error *err;
4613 	int nprinted = 0;
4614 	char *line;
4615 	size_t linesize = 0;
4616 	ssize_t linelen;
4617 	wchar_t *wline;
4618 	int width;
4619 	int max_lines = view->nlines;
4620 	int nlines = s->nlines;
4621 	off_t line_offset;
4622 
4623 	s->lineno = s->first_displayed_line - 1;
4624 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4625 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4626 		return got_error_from_errno("fseek");
4627 
4628 	werase(view->window);
4629 
4630 	if (view->gline > s->nlines - 1)
4631 		view->gline = s->nlines - 1;
4632 
4633 	if (header) {
4634 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4635 		    1 : view->gline - (view->nlines - 3) / 2 :
4636 		    s->lineno + s->selected_line;
4637 
4638 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4639 			return got_error_from_errno("asprintf");
4640 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4641 		    0, 0);
4642 		free(line);
4643 		if (err)
4644 			return err;
4645 
4646 		if (view_needs_focus_indication(view))
4647 			wstandout(view->window);
4648 		waddwstr(view->window, wline);
4649 		free(wline);
4650 		wline = NULL;
4651 		while (width++ < view->ncols)
4652 			waddch(view->window, ' ');
4653 		if (view_needs_focus_indication(view))
4654 			wstandend(view->window);
4655 
4656 		if (max_lines <= 1)
4657 			return NULL;
4658 		max_lines--;
4659 	}
4660 
4661 	s->eof = 0;
4662 	view->maxx = 0;
4663 	line = NULL;
4664 	while (max_lines > 0 && nprinted < max_lines) {
4665 		enum got_diff_line_type linetype;
4666 		attr_t attr = 0;
4667 
4668 		linelen = getline(&line, &linesize, s->f);
4669 		if (linelen == -1) {
4670 			if (feof(s->f)) {
4671 				s->eof = 1;
4672 				break;
4673 			}
4674 			free(line);
4675 			return got_ferror(s->f, GOT_ERR_IO);
4676 		}
4677 
4678 		if (++s->lineno < s->first_displayed_line)
4679 			continue;
4680 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4681 			continue;
4682 		if (s->lineno == view->hiline)
4683 			attr = A_STANDOUT;
4684 
4685 		/* Set view->maxx based on full line length. */
4686 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4687 		    view->x ? 1 : 0);
4688 		if (err) {
4689 			free(line);
4690 			return err;
4691 		}
4692 		view->maxx = MAX(view->maxx, width);
4693 		free(wline);
4694 		wline = NULL;
4695 
4696 		linetype = s->lines[s->lineno].type;
4697 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4698 		    linetype < GOT_DIFF_LINE_CONTEXT)
4699 			attr |= COLOR_PAIR(linetype);
4700 		if (attr)
4701 			wattron(view->window, attr);
4702 		if (s->first_displayed_line + nprinted == s->matched_line &&
4703 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4704 			err = add_matched_line(&width, line, view->ncols, 0,
4705 			    view->window, view->x, regmatch);
4706 			if (err) {
4707 				free(line);
4708 				return err;
4709 			}
4710 		} else {
4711 			int skip;
4712 			err = format_line(&wline, &width, &skip, line,
4713 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4714 			if (err) {
4715 				free(line);
4716 				return err;
4717 			}
4718 			waddwstr(view->window, &wline[skip]);
4719 			free(wline);
4720 			wline = NULL;
4721 		}
4722 		if (s->lineno == view->hiline) {
4723 			/* highlight full gline length */
4724 			while (width++ < view->ncols)
4725 				waddch(view->window, ' ');
4726 		} else {
4727 			if (width <= view->ncols - 1)
4728 				waddch(view->window, '\n');
4729 		}
4730 		if (attr)
4731 			wattroff(view->window, attr);
4732 		if (++nprinted == 1)
4733 			s->first_displayed_line = s->lineno;
4734 	}
4735 	free(line);
4736 	if (nprinted >= 1)
4737 		s->last_displayed_line = s->first_displayed_line +
4738 		    (nprinted - 1);
4739 	else
4740 		s->last_displayed_line = s->first_displayed_line;
4741 
4742 	view_border(view);
4743 
4744 	if (s->eof) {
4745 		while (nprinted < view->nlines) {
4746 			waddch(view->window, '\n');
4747 			nprinted++;
4748 		}
4749 
4750 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4751 		    view->ncols, 0, 0);
4752 		if (err) {
4753 			return err;
4754 		}
4755 
4756 		wstandout(view->window);
4757 		waddwstr(view->window, wline);
4758 		free(wline);
4759 		wline = NULL;
4760 		wstandend(view->window);
4761 	}
4762 
4763 	return NULL;
4764 }
4765 
4766 static char *
4767 get_datestr(time_t *time, char *datebuf)
4768 {
4769 	struct tm mytm, *tm;
4770 	char *p, *s;
4771 
4772 	tm = gmtime_r(time, &mytm);
4773 	if (tm == NULL)
4774 		return NULL;
4775 	s = asctime_r(tm, datebuf);
4776 	if (s == NULL)
4777 		return NULL;
4778 	p = strchr(s, '\n');
4779 	if (p)
4780 		*p = '\0';
4781 	return s;
4782 }
4783 
4784 static const struct got_error *
4785 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4786     off_t off, uint8_t type)
4787 {
4788 	struct got_diff_line *p;
4789 
4790 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4791 	if (p == NULL)
4792 		return got_error_from_errno("reallocarray");
4793 	*lines = p;
4794 	(*lines)[*nlines].offset = off;
4795 	(*lines)[*nlines].type = type;
4796 	(*nlines)++;
4797 
4798 	return NULL;
4799 }
4800 
4801 static const struct got_error *
4802 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4803     struct got_diff_line *s_lines, size_t s_nlines)
4804 {
4805 	struct got_diff_line	*p;
4806 	char			 buf[BUFSIZ];
4807 	size_t			 i, r;
4808 
4809 	if (fseeko(src, 0L, SEEK_SET) == -1)
4810 		return got_error_from_errno("fseeko");
4811 
4812 	for (;;) {
4813 		r = fread(buf, 1, sizeof(buf), src);
4814 		if (r == 0) {
4815 			if (ferror(src))
4816 				return got_error_from_errno("fread");
4817 			if (feof(src))
4818 				break;
4819 		}
4820 		if (fwrite(buf, 1, r, dst) != r)
4821 			return got_ferror(dst, GOT_ERR_IO);
4822 	}
4823 
4824 	if (s_nlines == 0 && *d_nlines == 0)
4825 		return NULL;
4826 
4827 	/*
4828 	 * If commit info was in dst, increment line offsets
4829 	 * of the appended diff content, but skip s_lines[0]
4830 	 * because offset zero is already in *d_lines.
4831 	 */
4832 	if (*d_nlines > 0) {
4833 		for (i = 1; i < s_nlines; ++i)
4834 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4835 
4836 		if (s_nlines > 0) {
4837 			--s_nlines;
4838 			++s_lines;
4839 		}
4840 	}
4841 
4842 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4843 	if (p == NULL) {
4844 		/* d_lines is freed in close_diff_view() */
4845 		return got_error_from_errno("reallocarray");
4846 	}
4847 
4848 	*d_lines = p;
4849 
4850 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4851 	*d_nlines += s_nlines;
4852 
4853 	return NULL;
4854 }
4855 
4856 static const struct got_error *
4857 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4858     struct got_object_id *commit_id, struct got_reflist_head *refs,
4859     struct got_repository *repo, int ignore_ws, int force_text_diff,
4860     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4861 {
4862 	const struct got_error *err = NULL;
4863 	char datebuf[26], *datestr;
4864 	struct got_commit_object *commit;
4865 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4866 	time_t committer_time;
4867 	const char *author, *committer;
4868 	char *refs_str = NULL;
4869 	struct got_pathlist_entry *pe;
4870 	off_t outoff = 0;
4871 	int n;
4872 
4873 	if (refs) {
4874 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4875 		if (err)
4876 			return err;
4877 	}
4878 
4879 	err = got_object_open_as_commit(&commit, repo, commit_id);
4880 	if (err)
4881 		return err;
4882 
4883 	err = got_object_id_str(&id_str, commit_id);
4884 	if (err) {
4885 		err = got_error_from_errno("got_object_id_str");
4886 		goto done;
4887 	}
4888 
4889 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4890 	if (err)
4891 		goto done;
4892 
4893 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4894 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4895 	if (n < 0) {
4896 		err = got_error_from_errno("fprintf");
4897 		goto done;
4898 	}
4899 	outoff += n;
4900 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4901 	if (err)
4902 		goto done;
4903 
4904 	n = fprintf(outfile, "from: %s\n",
4905 	    got_object_commit_get_author(commit));
4906 	if (n < 0) {
4907 		err = got_error_from_errno("fprintf");
4908 		goto done;
4909 	}
4910 	outoff += n;
4911 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4912 	if (err)
4913 		goto done;
4914 
4915 	author = got_object_commit_get_author(commit);
4916 	committer = got_object_commit_get_committer(commit);
4917 	if (strcmp(author, committer) != 0) {
4918 		n = fprintf(outfile, "via: %s\n", committer);
4919 		if (n < 0) {
4920 			err = got_error_from_errno("fprintf");
4921 			goto done;
4922 		}
4923 		outoff += n;
4924 		err = add_line_metadata(lines, nlines, outoff,
4925 		    GOT_DIFF_LINE_AUTHOR);
4926 		if (err)
4927 			goto done;
4928 	}
4929 	committer_time = got_object_commit_get_committer_time(commit);
4930 	datestr = get_datestr(&committer_time, datebuf);
4931 	if (datestr) {
4932 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4933 		if (n < 0) {
4934 			err = got_error_from_errno("fprintf");
4935 			goto done;
4936 		}
4937 		outoff += n;
4938 		err = add_line_metadata(lines, nlines, outoff,
4939 		    GOT_DIFF_LINE_DATE);
4940 		if (err)
4941 			goto done;
4942 	}
4943 	if (got_object_commit_get_nparents(commit) > 1) {
4944 		const struct got_object_id_queue *parent_ids;
4945 		struct got_object_qid *qid;
4946 		int pn = 1;
4947 		parent_ids = got_object_commit_get_parent_ids(commit);
4948 		STAILQ_FOREACH(qid, parent_ids, entry) {
4949 			err = got_object_id_str(&id_str, &qid->id);
4950 			if (err)
4951 				goto done;
4952 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4953 			if (n < 0) {
4954 				err = got_error_from_errno("fprintf");
4955 				goto done;
4956 			}
4957 			outoff += n;
4958 			err = add_line_metadata(lines, nlines, outoff,
4959 			    GOT_DIFF_LINE_META);
4960 			if (err)
4961 				goto done;
4962 			free(id_str);
4963 			id_str = NULL;
4964 		}
4965 	}
4966 
4967 	err = got_object_commit_get_logmsg(&logmsg, commit);
4968 	if (err)
4969 		goto done;
4970 	s = logmsg;
4971 	while ((line = strsep(&s, "\n")) != NULL) {
4972 		n = fprintf(outfile, "%s\n", line);
4973 		if (n < 0) {
4974 			err = got_error_from_errno("fprintf");
4975 			goto done;
4976 		}
4977 		outoff += n;
4978 		err = add_line_metadata(lines, nlines, outoff,
4979 		    GOT_DIFF_LINE_LOGMSG);
4980 		if (err)
4981 			goto done;
4982 	}
4983 
4984 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4985 		struct got_diff_changed_path *cp = pe->data;
4986 		int pad = dsa->max_path_len - pe->path_len + 1;
4987 
4988 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4989 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4990 		    dsa->rm_cols + 1, cp->rm);
4991 		if (n < 0) {
4992 			err = got_error_from_errno("fprintf");
4993 			goto done;
4994 		}
4995 		outoff += n;
4996 		err = add_line_metadata(lines, nlines, outoff,
4997 		    GOT_DIFF_LINE_CHANGES);
4998 		if (err)
4999 			goto done;
5000 	}
5001 
5002 	fputc('\n', outfile);
5003 	outoff++;
5004 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5005 	if (err)
5006 		goto done;
5007 
5008 	n = fprintf(outfile,
5009 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5010 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5011 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5012 	if (n < 0) {
5013 		err = got_error_from_errno("fprintf");
5014 		goto done;
5015 	}
5016 	outoff += n;
5017 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5018 	if (err)
5019 		goto done;
5020 
5021 	fputc('\n', outfile);
5022 	outoff++;
5023 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5024 done:
5025 	free(id_str);
5026 	free(logmsg);
5027 	free(refs_str);
5028 	got_object_commit_close(commit);
5029 	if (err) {
5030 		free(*lines);
5031 		*lines = NULL;
5032 		*nlines = 0;
5033 	}
5034 	return err;
5035 }
5036 
5037 static const struct got_error *
5038 create_diff(struct tog_diff_view_state *s)
5039 {
5040 	const struct got_error *err = NULL;
5041 	FILE *f = NULL, *tmp_diff_file = NULL;
5042 	int obj_type;
5043 	struct got_diff_line *lines = NULL;
5044 	struct got_pathlist_head changed_paths;
5045 
5046 	TAILQ_INIT(&changed_paths);
5047 
5048 	free(s->lines);
5049 	s->lines = malloc(sizeof(*s->lines));
5050 	if (s->lines == NULL)
5051 		return got_error_from_errno("malloc");
5052 	s->nlines = 0;
5053 
5054 	f = got_opentemp();
5055 	if (f == NULL) {
5056 		err = got_error_from_errno("got_opentemp");
5057 		goto done;
5058 	}
5059 	tmp_diff_file = got_opentemp();
5060 	if (tmp_diff_file == NULL) {
5061 		err = got_error_from_errno("got_opentemp");
5062 		goto done;
5063 	}
5064 	if (s->f && fclose(s->f) == EOF) {
5065 		err = got_error_from_errno("fclose");
5066 		goto done;
5067 	}
5068 	s->f = f;
5069 
5070 	if (s->id1)
5071 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5072 	else
5073 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5074 	if (err)
5075 		goto done;
5076 
5077 	switch (obj_type) {
5078 	case GOT_OBJ_TYPE_BLOB:
5079 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5080 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5081 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5082 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5083 		    s->f);
5084 		break;
5085 	case GOT_OBJ_TYPE_TREE:
5086 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5087 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5088 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5089 		    s->force_text_diff, NULL, s->repo, s->f);
5090 		break;
5091 	case GOT_OBJ_TYPE_COMMIT: {
5092 		const struct got_object_id_queue *parent_ids;
5093 		struct got_object_qid *pid;
5094 		struct got_commit_object *commit2;
5095 		struct got_reflist_head *refs;
5096 		size_t nlines = 0;
5097 		struct got_diffstat_cb_arg dsa = {
5098 			0, 0, 0, 0, 0, 0,
5099 			&changed_paths,
5100 			s->ignore_whitespace,
5101 			s->force_text_diff,
5102 			tog_diff_algo
5103 		};
5104 
5105 		lines = malloc(sizeof(*lines));
5106 		if (lines == NULL) {
5107 			err = got_error_from_errno("malloc");
5108 			goto done;
5109 		}
5110 
5111 		/* build diff first in tmp file then append to commit info */
5112 		err = got_diff_objects_as_commits(&lines, &nlines,
5113 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5114 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5115 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5116 		if (err)
5117 			break;
5118 
5119 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5120 		if (err)
5121 			goto done;
5122 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5123 		/* Show commit info if we're diffing to a parent/root commit. */
5124 		if (s->id1 == NULL) {
5125 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5126 			    refs, s->repo, s->ignore_whitespace,
5127 			    s->force_text_diff, &dsa, s->f);
5128 			if (err)
5129 				goto done;
5130 		} else {
5131 			parent_ids = got_object_commit_get_parent_ids(commit2);
5132 			STAILQ_FOREACH(pid, parent_ids, entry) {
5133 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5134 					err = write_commit_info(&s->lines,
5135 					    &s->nlines, s->id2, refs, s->repo,
5136 					    s->ignore_whitespace,
5137 					    s->force_text_diff, &dsa, s->f);
5138 					if (err)
5139 						goto done;
5140 					break;
5141 				}
5142 			}
5143 		}
5144 		got_object_commit_close(commit2);
5145 
5146 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5147 		    lines, nlines);
5148 		break;
5149 	}
5150 	default:
5151 		err = got_error(GOT_ERR_OBJ_TYPE);
5152 		break;
5153 	}
5154 done:
5155 	free(lines);
5156 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5157 	if (s->f && fflush(s->f) != 0 && err == NULL)
5158 		err = got_error_from_errno("fflush");
5159 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5160 		err = got_error_from_errno("fclose");
5161 	return err;
5162 }
5163 
5164 static void
5165 diff_view_indicate_progress(struct tog_view *view)
5166 {
5167 	mvwaddstr(view->window, 0, 0, "diffing...");
5168 	update_panels();
5169 	doupdate();
5170 }
5171 
5172 static const struct got_error *
5173 search_start_diff_view(struct tog_view *view)
5174 {
5175 	struct tog_diff_view_state *s = &view->state.diff;
5176 
5177 	s->matched_line = 0;
5178 	return NULL;
5179 }
5180 
5181 static void
5182 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5183     size_t *nlines, int **first, int **last, int **match, int **selected)
5184 {
5185 	struct tog_diff_view_state *s = &view->state.diff;
5186 
5187 	*f = s->f;
5188 	*nlines = s->nlines;
5189 	*line_offsets = NULL;
5190 	*match = &s->matched_line;
5191 	*first = &s->first_displayed_line;
5192 	*last = &s->last_displayed_line;
5193 	*selected = &s->selected_line;
5194 }
5195 
5196 static const struct got_error *
5197 search_next_view_match(struct tog_view *view)
5198 {
5199 	const struct got_error *err = NULL;
5200 	FILE *f;
5201 	int lineno;
5202 	char *line = NULL;
5203 	size_t linesize = 0;
5204 	ssize_t linelen;
5205 	off_t *line_offsets;
5206 	size_t nlines = 0;
5207 	int *first, *last, *match, *selected;
5208 
5209 	if (!view->search_setup)
5210 		return got_error_msg(GOT_ERR_NOT_IMPL,
5211 		    "view search not supported");
5212 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5213 	    &match, &selected);
5214 
5215 	if (!view->searching) {
5216 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5217 		return NULL;
5218 	}
5219 
5220 	if (*match) {
5221 		if (view->searching == TOG_SEARCH_FORWARD)
5222 			lineno = *first + 1;
5223 		else
5224 			lineno = *first - 1;
5225 	} else
5226 		lineno = *first - 1 + *selected;
5227 
5228 	while (1) {
5229 		off_t offset;
5230 
5231 		if (lineno <= 0 || lineno > nlines) {
5232 			if (*match == 0) {
5233 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5234 				break;
5235 			}
5236 
5237 			if (view->searching == TOG_SEARCH_FORWARD)
5238 				lineno = 1;
5239 			else
5240 				lineno = nlines;
5241 		}
5242 
5243 		offset = view->type == TOG_VIEW_DIFF ?
5244 		    view->state.diff.lines[lineno - 1].offset :
5245 		    line_offsets[lineno - 1];
5246 		if (fseeko(f, offset, SEEK_SET) != 0) {
5247 			free(line);
5248 			return got_error_from_errno("fseeko");
5249 		}
5250 		linelen = getline(&line, &linesize, f);
5251 		if (linelen != -1) {
5252 			char *exstr;
5253 			err = expand_tab(&exstr, line);
5254 			if (err)
5255 				break;
5256 			if (match_line(exstr, &view->regex, 1,
5257 			    &view->regmatch)) {
5258 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5259 				*match = lineno;
5260 				free(exstr);
5261 				break;
5262 			}
5263 			free(exstr);
5264 		}
5265 		if (view->searching == TOG_SEARCH_FORWARD)
5266 			lineno++;
5267 		else
5268 			lineno--;
5269 	}
5270 	free(line);
5271 
5272 	if (*match) {
5273 		*first = *match;
5274 		*selected = 1;
5275 	}
5276 
5277 	return err;
5278 }
5279 
5280 static const struct got_error *
5281 close_diff_view(struct tog_view *view)
5282 {
5283 	const struct got_error *err = NULL;
5284 	struct tog_diff_view_state *s = &view->state.diff;
5285 
5286 	free(s->id1);
5287 	s->id1 = NULL;
5288 	free(s->id2);
5289 	s->id2 = NULL;
5290 	if (s->f && fclose(s->f) == EOF)
5291 		err = got_error_from_errno("fclose");
5292 	s->f = NULL;
5293 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5294 		err = got_error_from_errno("fclose");
5295 	s->f1 = NULL;
5296 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5297 		err = got_error_from_errno("fclose");
5298 	s->f2 = NULL;
5299 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5300 		err = got_error_from_errno("close");
5301 	s->fd1 = -1;
5302 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5303 		err = got_error_from_errno("close");
5304 	s->fd2 = -1;
5305 	free(s->lines);
5306 	s->lines = NULL;
5307 	s->nlines = 0;
5308 	return err;
5309 }
5310 
5311 static const struct got_error *
5312 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5313     struct got_object_id *id2, const char *label1, const char *label2,
5314     int diff_context, int ignore_whitespace, int force_text_diff,
5315     struct tog_view *parent_view, struct got_repository *repo)
5316 {
5317 	const struct got_error *err;
5318 	struct tog_diff_view_state *s = &view->state.diff;
5319 
5320 	memset(s, 0, sizeof(*s));
5321 	s->fd1 = -1;
5322 	s->fd2 = -1;
5323 
5324 	if (id1 != NULL && id2 != NULL) {
5325 	    int type1, type2;
5326 	    err = got_object_get_type(&type1, repo, id1);
5327 	    if (err)
5328 		return err;
5329 	    err = got_object_get_type(&type2, repo, id2);
5330 	    if (err)
5331 		return err;
5332 
5333 	    if (type1 != type2)
5334 		return got_error(GOT_ERR_OBJ_TYPE);
5335 	}
5336 	s->first_displayed_line = 1;
5337 	s->last_displayed_line = view->nlines;
5338 	s->selected_line = 1;
5339 	s->repo = repo;
5340 	s->id1 = id1;
5341 	s->id2 = id2;
5342 	s->label1 = label1;
5343 	s->label2 = label2;
5344 
5345 	if (id1) {
5346 		s->id1 = got_object_id_dup(id1);
5347 		if (s->id1 == NULL)
5348 			return got_error_from_errno("got_object_id_dup");
5349 	} else
5350 		s->id1 = NULL;
5351 
5352 	s->id2 = got_object_id_dup(id2);
5353 	if (s->id2 == NULL) {
5354 		err = got_error_from_errno("got_object_id_dup");
5355 		goto done;
5356 	}
5357 
5358 	s->f1 = got_opentemp();
5359 	if (s->f1 == NULL) {
5360 		err = got_error_from_errno("got_opentemp");
5361 		goto done;
5362 	}
5363 
5364 	s->f2 = got_opentemp();
5365 	if (s->f2 == NULL) {
5366 		err = got_error_from_errno("got_opentemp");
5367 		goto done;
5368 	}
5369 
5370 	s->fd1 = got_opentempfd();
5371 	if (s->fd1 == -1) {
5372 		err = got_error_from_errno("got_opentempfd");
5373 		goto done;
5374 	}
5375 
5376 	s->fd2 = got_opentempfd();
5377 	if (s->fd2 == -1) {
5378 		err = got_error_from_errno("got_opentempfd");
5379 		goto done;
5380 	}
5381 
5382 	s->diff_context = diff_context;
5383 	s->ignore_whitespace = ignore_whitespace;
5384 	s->force_text_diff = force_text_diff;
5385 	s->parent_view = parent_view;
5386 	s->repo = repo;
5387 
5388 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5389 		int rc;
5390 
5391 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5392 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5393 		if (rc != ERR)
5394 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5395 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5396 		if (rc != ERR)
5397 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5398 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5399 		if (rc != ERR)
5400 			rc = init_pair(GOT_DIFF_LINE_META,
5401 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5402 		if (rc != ERR)
5403 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5404 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5405 		if (rc != ERR)
5406 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5407 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5408 		if (rc != ERR)
5409 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5410 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5411 		if (rc != ERR)
5412 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5413 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5414 		if (rc != ERR)
5415 			rc = init_pair(GOT_DIFF_LINE_DATE,
5416 			    get_color_value("TOG_COLOR_DATE"), -1);
5417 		if (rc == ERR) {
5418 			err = got_error(GOT_ERR_RANGE);
5419 			goto done;
5420 		}
5421 	}
5422 
5423 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5424 	    view_is_splitscreen(view))
5425 		show_log_view(parent_view); /* draw border */
5426 	diff_view_indicate_progress(view);
5427 
5428 	err = create_diff(s);
5429 
5430 	view->show = show_diff_view;
5431 	view->input = input_diff_view;
5432 	view->reset = reset_diff_view;
5433 	view->close = close_diff_view;
5434 	view->search_start = search_start_diff_view;
5435 	view->search_setup = search_setup_diff_view;
5436 	view->search_next = search_next_view_match;
5437 done:
5438 	if (err)
5439 		close_diff_view(view);
5440 	return err;
5441 }
5442 
5443 static const struct got_error *
5444 show_diff_view(struct tog_view *view)
5445 {
5446 	const struct got_error *err;
5447 	struct tog_diff_view_state *s = &view->state.diff;
5448 	char *id_str1 = NULL, *id_str2, *header;
5449 	const char *label1, *label2;
5450 
5451 	if (s->id1) {
5452 		err = got_object_id_str(&id_str1, s->id1);
5453 		if (err)
5454 			return err;
5455 		label1 = s->label1 ? s->label1 : id_str1;
5456 	} else
5457 		label1 = "/dev/null";
5458 
5459 	err = got_object_id_str(&id_str2, s->id2);
5460 	if (err)
5461 		return err;
5462 	label2 = s->label2 ? s->label2 : id_str2;
5463 
5464 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5465 		err = got_error_from_errno("asprintf");
5466 		free(id_str1);
5467 		free(id_str2);
5468 		return err;
5469 	}
5470 	free(id_str1);
5471 	free(id_str2);
5472 
5473 	err = draw_file(view, header);
5474 	free(header);
5475 	return err;
5476 }
5477 
5478 static const struct got_error *
5479 set_selected_commit(struct tog_diff_view_state *s,
5480     struct commit_queue_entry *entry)
5481 {
5482 	const struct got_error *err;
5483 	const struct got_object_id_queue *parent_ids;
5484 	struct got_commit_object *selected_commit;
5485 	struct got_object_qid *pid;
5486 
5487 	free(s->id2);
5488 	s->id2 = got_object_id_dup(entry->id);
5489 	if (s->id2 == NULL)
5490 		return got_error_from_errno("got_object_id_dup");
5491 
5492 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5493 	if (err)
5494 		return err;
5495 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5496 	free(s->id1);
5497 	pid = STAILQ_FIRST(parent_ids);
5498 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5499 	got_object_commit_close(selected_commit);
5500 	return NULL;
5501 }
5502 
5503 static const struct got_error *
5504 reset_diff_view(struct tog_view *view)
5505 {
5506 	struct tog_diff_view_state *s = &view->state.diff;
5507 
5508 	view->count = 0;
5509 	wclear(view->window);
5510 	s->first_displayed_line = 1;
5511 	s->last_displayed_line = view->nlines;
5512 	s->matched_line = 0;
5513 	diff_view_indicate_progress(view);
5514 	return create_diff(s);
5515 }
5516 
5517 static void
5518 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5519 {
5520 	int start, i;
5521 
5522 	i = start = s->first_displayed_line - 1;
5523 
5524 	while (s->lines[i].type != type) {
5525 		if (i == 0)
5526 			i = s->nlines - 1;
5527 		if (--i == start)
5528 			return; /* do nothing, requested type not in file */
5529 	}
5530 
5531 	s->selected_line = 1;
5532 	s->first_displayed_line = i;
5533 }
5534 
5535 static void
5536 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5537 {
5538 	int start, i;
5539 
5540 	i = start = s->first_displayed_line + 1;
5541 
5542 	while (s->lines[i].type != type) {
5543 		if (i == s->nlines - 1)
5544 			i = 0;
5545 		if (++i == start)
5546 			return; /* do nothing, requested type not in file */
5547 	}
5548 
5549 	s->selected_line = 1;
5550 	s->first_displayed_line = i;
5551 }
5552 
5553 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5554     int, int, int);
5555 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5556     int, int);
5557 
5558 static const struct got_error *
5559 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5560 {
5561 	const struct got_error *err = NULL;
5562 	struct tog_diff_view_state *s = &view->state.diff;
5563 	struct tog_log_view_state *ls;
5564 	struct commit_queue_entry *old_selected_entry;
5565 	char *line = NULL;
5566 	size_t linesize = 0;
5567 	ssize_t linelen;
5568 	int i, nscroll = view->nlines - 1, up = 0;
5569 
5570 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5571 
5572 	switch (ch) {
5573 	case '0':
5574 	case '$':
5575 	case KEY_RIGHT:
5576 	case 'l':
5577 	case KEY_LEFT:
5578 	case 'h':
5579 		horizontal_scroll_input(view, ch);
5580 		break;
5581 	case 'a':
5582 	case 'w':
5583 		if (ch == 'a') {
5584 			s->force_text_diff = !s->force_text_diff;
5585 			view->action = s->force_text_diff ?
5586 			    "force ASCII text enabled" :
5587 			    "force ASCII text disabled";
5588 		}
5589 		else if (ch == 'w') {
5590 			s->ignore_whitespace = !s->ignore_whitespace;
5591 			view->action = s->ignore_whitespace ?
5592 			    "ignore whitespace enabled" :
5593 			    "ignore whitespace disabled";
5594 		}
5595 		err = reset_diff_view(view);
5596 		break;
5597 	case 'g':
5598 	case KEY_HOME:
5599 		s->first_displayed_line = 1;
5600 		view->count = 0;
5601 		break;
5602 	case 'G':
5603 	case KEY_END:
5604 		view->count = 0;
5605 		if (s->eof)
5606 			break;
5607 
5608 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5609 		s->eof = 1;
5610 		break;
5611 	case 'k':
5612 	case KEY_UP:
5613 	case CTRL('p'):
5614 		if (s->first_displayed_line > 1)
5615 			s->first_displayed_line--;
5616 		else
5617 			view->count = 0;
5618 		break;
5619 	case CTRL('u'):
5620 	case 'u':
5621 		nscroll /= 2;
5622 		/* FALL THROUGH */
5623 	case KEY_PPAGE:
5624 	case CTRL('b'):
5625 	case 'b':
5626 		if (s->first_displayed_line == 1) {
5627 			view->count = 0;
5628 			break;
5629 		}
5630 		i = 0;
5631 		while (i++ < nscroll && s->first_displayed_line > 1)
5632 			s->first_displayed_line--;
5633 		break;
5634 	case 'j':
5635 	case KEY_DOWN:
5636 	case CTRL('n'):
5637 		if (!s->eof)
5638 			s->first_displayed_line++;
5639 		else
5640 			view->count = 0;
5641 		break;
5642 	case CTRL('d'):
5643 	case 'd':
5644 		nscroll /= 2;
5645 		/* FALL THROUGH */
5646 	case KEY_NPAGE:
5647 	case CTRL('f'):
5648 	case 'f':
5649 	case ' ':
5650 		if (s->eof) {
5651 			view->count = 0;
5652 			break;
5653 		}
5654 		i = 0;
5655 		while (!s->eof && i++ < nscroll) {
5656 			linelen = getline(&line, &linesize, s->f);
5657 			s->first_displayed_line++;
5658 			if (linelen == -1) {
5659 				if (feof(s->f)) {
5660 					s->eof = 1;
5661 				} else
5662 					err = got_ferror(s->f, GOT_ERR_IO);
5663 				break;
5664 			}
5665 		}
5666 		free(line);
5667 		break;
5668 	case '(':
5669 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5670 		break;
5671 	case ')':
5672 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5673 		break;
5674 	case '{':
5675 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5676 		break;
5677 	case '}':
5678 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5679 		break;
5680 	case '[':
5681 		if (s->diff_context > 0) {
5682 			s->diff_context--;
5683 			s->matched_line = 0;
5684 			diff_view_indicate_progress(view);
5685 			err = create_diff(s);
5686 			if (s->first_displayed_line + view->nlines - 1 >
5687 			    s->nlines) {
5688 				s->first_displayed_line = 1;
5689 				s->last_displayed_line = view->nlines;
5690 			}
5691 		} else
5692 			view->count = 0;
5693 		break;
5694 	case ']':
5695 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5696 			s->diff_context++;
5697 			s->matched_line = 0;
5698 			diff_view_indicate_progress(view);
5699 			err = create_diff(s);
5700 		} else
5701 			view->count = 0;
5702 		break;
5703 	case '<':
5704 	case ',':
5705 	case 'K':
5706 		up = 1;
5707 		/* FALL THROUGH */
5708 	case '>':
5709 	case '.':
5710 	case 'J':
5711 		if (s->parent_view == NULL) {
5712 			view->count = 0;
5713 			break;
5714 		}
5715 		s->parent_view->count = view->count;
5716 
5717 		if (s->parent_view->type == TOG_VIEW_LOG) {
5718 			ls = &s->parent_view->state.log;
5719 			old_selected_entry = ls->selected_entry;
5720 
5721 			err = input_log_view(NULL, s->parent_view,
5722 			    up ? KEY_UP : KEY_DOWN);
5723 			if (err)
5724 				break;
5725 			view->count = s->parent_view->count;
5726 
5727 			if (old_selected_entry == ls->selected_entry)
5728 				break;
5729 
5730 			err = set_selected_commit(s, ls->selected_entry);
5731 			if (err)
5732 				break;
5733 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5734 			struct tog_blame_view_state *bs;
5735 			struct got_object_id *id, *prev_id;
5736 
5737 			bs = &s->parent_view->state.blame;
5738 			prev_id = get_annotation_for_line(bs->blame.lines,
5739 			    bs->blame.nlines, bs->last_diffed_line);
5740 
5741 			err = input_blame_view(&view, s->parent_view,
5742 			    up ? KEY_UP : KEY_DOWN);
5743 			if (err)
5744 				break;
5745 			view->count = s->parent_view->count;
5746 
5747 			if (prev_id == NULL)
5748 				break;
5749 			id = get_selected_commit_id(bs->blame.lines,
5750 			    bs->blame.nlines, bs->first_displayed_line,
5751 			    bs->selected_line);
5752 			if (id == NULL)
5753 				break;
5754 
5755 			if (!got_object_id_cmp(prev_id, id))
5756 				break;
5757 
5758 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5759 			if (err)
5760 				break;
5761 		}
5762 		s->first_displayed_line = 1;
5763 		s->last_displayed_line = view->nlines;
5764 		s->matched_line = 0;
5765 		view->x = 0;
5766 
5767 		diff_view_indicate_progress(view);
5768 		err = create_diff(s);
5769 		break;
5770 	default:
5771 		view->count = 0;
5772 		break;
5773 	}
5774 
5775 	return err;
5776 }
5777 
5778 static const struct got_error *
5779 cmd_diff(int argc, char *argv[])
5780 {
5781 	const struct got_error *error;
5782 	struct got_repository *repo = NULL;
5783 	struct got_worktree *worktree = NULL;
5784 	struct got_object_id *id1 = NULL, *id2 = NULL;
5785 	char *repo_path = NULL, *cwd = NULL;
5786 	char *id_str1 = NULL, *id_str2 = NULL;
5787 	char *label1 = NULL, *label2 = NULL;
5788 	int diff_context = 3, ignore_whitespace = 0;
5789 	int ch, force_text_diff = 0;
5790 	const char *errstr;
5791 	struct tog_view *view;
5792 	int *pack_fds = NULL;
5793 
5794 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5795 		switch (ch) {
5796 		case 'a':
5797 			force_text_diff = 1;
5798 			break;
5799 		case 'C':
5800 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5801 			    &errstr);
5802 			if (errstr != NULL)
5803 				errx(1, "number of context lines is %s: %s",
5804 				    errstr, errstr);
5805 			break;
5806 		case 'r':
5807 			repo_path = realpath(optarg, NULL);
5808 			if (repo_path == NULL)
5809 				return got_error_from_errno2("realpath",
5810 				    optarg);
5811 			got_path_strip_trailing_slashes(repo_path);
5812 			break;
5813 		case 'w':
5814 			ignore_whitespace = 1;
5815 			break;
5816 		default:
5817 			usage_diff();
5818 			/* NOTREACHED */
5819 		}
5820 	}
5821 
5822 	argc -= optind;
5823 	argv += optind;
5824 
5825 	if (argc == 0) {
5826 		usage_diff(); /* TODO show local worktree changes */
5827 	} else if (argc == 2) {
5828 		id_str1 = argv[0];
5829 		id_str2 = argv[1];
5830 	} else
5831 		usage_diff();
5832 
5833 	error = got_repo_pack_fds_open(&pack_fds);
5834 	if (error)
5835 		goto done;
5836 
5837 	if (repo_path == NULL) {
5838 		cwd = getcwd(NULL, 0);
5839 		if (cwd == NULL)
5840 			return got_error_from_errno("getcwd");
5841 		error = got_worktree_open(&worktree, cwd);
5842 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5843 			goto done;
5844 		if (worktree)
5845 			repo_path =
5846 			    strdup(got_worktree_get_repo_path(worktree));
5847 		else
5848 			repo_path = strdup(cwd);
5849 		if (repo_path == NULL) {
5850 			error = got_error_from_errno("strdup");
5851 			goto done;
5852 		}
5853 	}
5854 
5855 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5856 	if (error)
5857 		goto done;
5858 
5859 	init_curses();
5860 
5861 	error = apply_unveil(got_repo_get_path(repo), NULL);
5862 	if (error)
5863 		goto done;
5864 
5865 	error = tog_load_refs(repo, 0);
5866 	if (error)
5867 		goto done;
5868 
5869 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5870 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5871 	if (error)
5872 		goto done;
5873 
5874 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5875 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5876 	if (error)
5877 		goto done;
5878 
5879 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5880 	if (view == NULL) {
5881 		error = got_error_from_errno("view_open");
5882 		goto done;
5883 	}
5884 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5885 	    ignore_whitespace, force_text_diff, NULL,  repo);
5886 	if (error)
5887 		goto done;
5888 	error = view_loop(view);
5889 done:
5890 	free(label1);
5891 	free(label2);
5892 	free(repo_path);
5893 	free(cwd);
5894 	if (repo) {
5895 		const struct got_error *close_err = got_repo_close(repo);
5896 		if (error == NULL)
5897 			error = close_err;
5898 	}
5899 	if (worktree)
5900 		got_worktree_close(worktree);
5901 	if (pack_fds) {
5902 		const struct got_error *pack_err =
5903 		    got_repo_pack_fds_close(pack_fds);
5904 		if (error == NULL)
5905 			error = pack_err;
5906 	}
5907 	tog_free_refs();
5908 	return error;
5909 }
5910 
5911 __dead static void
5912 usage_blame(void)
5913 {
5914 	endwin();
5915 	fprintf(stderr,
5916 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5917 	    getprogname());
5918 	exit(1);
5919 }
5920 
5921 struct tog_blame_line {
5922 	int annotated;
5923 	struct got_object_id *id;
5924 };
5925 
5926 static const struct got_error *
5927 draw_blame(struct tog_view *view)
5928 {
5929 	struct tog_blame_view_state *s = &view->state.blame;
5930 	struct tog_blame *blame = &s->blame;
5931 	regmatch_t *regmatch = &view->regmatch;
5932 	const struct got_error *err;
5933 	int lineno = 0, nprinted = 0;
5934 	char *line = NULL;
5935 	size_t linesize = 0;
5936 	ssize_t linelen;
5937 	wchar_t *wline;
5938 	int width;
5939 	struct tog_blame_line *blame_line;
5940 	struct got_object_id *prev_id = NULL;
5941 	char *id_str;
5942 	struct tog_color *tc;
5943 
5944 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5945 	if (err)
5946 		return err;
5947 
5948 	rewind(blame->f);
5949 	werase(view->window);
5950 
5951 	if (asprintf(&line, "commit %s", id_str) == -1) {
5952 		err = got_error_from_errno("asprintf");
5953 		free(id_str);
5954 		return err;
5955 	}
5956 
5957 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5958 	free(line);
5959 	line = NULL;
5960 	if (err)
5961 		return err;
5962 	if (view_needs_focus_indication(view))
5963 		wstandout(view->window);
5964 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5965 	if (tc)
5966 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5967 	waddwstr(view->window, wline);
5968 	while (width++ < view->ncols)
5969 		waddch(view->window, ' ');
5970 	if (tc)
5971 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5972 	if (view_needs_focus_indication(view))
5973 		wstandend(view->window);
5974 	free(wline);
5975 	wline = NULL;
5976 
5977 	if (view->gline > blame->nlines)
5978 		view->gline = blame->nlines;
5979 
5980 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5981 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5982 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5983 		free(id_str);
5984 		return got_error_from_errno("asprintf");
5985 	}
5986 	free(id_str);
5987 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5988 	free(line);
5989 	line = NULL;
5990 	if (err)
5991 		return err;
5992 	waddwstr(view->window, wline);
5993 	free(wline);
5994 	wline = NULL;
5995 	if (width < view->ncols - 1)
5996 		waddch(view->window, '\n');
5997 
5998 	s->eof = 0;
5999 	view->maxx = 0;
6000 	while (nprinted < view->nlines - 2) {
6001 		linelen = getline(&line, &linesize, blame->f);
6002 		if (linelen == -1) {
6003 			if (feof(blame->f)) {
6004 				s->eof = 1;
6005 				break;
6006 			}
6007 			free(line);
6008 			return got_ferror(blame->f, GOT_ERR_IO);
6009 		}
6010 		if (++lineno < s->first_displayed_line)
6011 			continue;
6012 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6013 			continue;
6014 
6015 		/* Set view->maxx based on full line length. */
6016 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6017 		if (err) {
6018 			free(line);
6019 			return err;
6020 		}
6021 		free(wline);
6022 		wline = NULL;
6023 		view->maxx = MAX(view->maxx, width);
6024 
6025 		if (nprinted == s->selected_line - 1)
6026 			wstandout(view->window);
6027 
6028 		if (blame->nlines > 0) {
6029 			blame_line = &blame->lines[lineno - 1];
6030 			if (blame_line->annotated && prev_id &&
6031 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6032 			    !(nprinted == s->selected_line - 1)) {
6033 				waddstr(view->window, "        ");
6034 			} else if (blame_line->annotated) {
6035 				char *id_str;
6036 				err = got_object_id_str(&id_str,
6037 				    blame_line->id);
6038 				if (err) {
6039 					free(line);
6040 					return err;
6041 				}
6042 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6043 				if (tc)
6044 					wattr_on(view->window,
6045 					    COLOR_PAIR(tc->colorpair), NULL);
6046 				wprintw(view->window, "%.8s", id_str);
6047 				if (tc)
6048 					wattr_off(view->window,
6049 					    COLOR_PAIR(tc->colorpair), NULL);
6050 				free(id_str);
6051 				prev_id = blame_line->id;
6052 			} else {
6053 				waddstr(view->window, "........");
6054 				prev_id = NULL;
6055 			}
6056 		} else {
6057 			waddstr(view->window, "........");
6058 			prev_id = NULL;
6059 		}
6060 
6061 		if (nprinted == s->selected_line - 1)
6062 			wstandend(view->window);
6063 		waddstr(view->window, " ");
6064 
6065 		if (view->ncols <= 9) {
6066 			width = 9;
6067 		} else if (s->first_displayed_line + nprinted ==
6068 		    s->matched_line &&
6069 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6070 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6071 			    view->window, view->x, regmatch);
6072 			if (err) {
6073 				free(line);
6074 				return err;
6075 			}
6076 			width += 9;
6077 		} else {
6078 			int skip;
6079 			err = format_line(&wline, &width, &skip, line,
6080 			    view->x, view->ncols - 9, 9, 1);
6081 			if (err) {
6082 				free(line);
6083 				return err;
6084 			}
6085 			waddwstr(view->window, &wline[skip]);
6086 			width += 9;
6087 			free(wline);
6088 			wline = NULL;
6089 		}
6090 
6091 		if (width <= view->ncols - 1)
6092 			waddch(view->window, '\n');
6093 		if (++nprinted == 1)
6094 			s->first_displayed_line = lineno;
6095 	}
6096 	free(line);
6097 	s->last_displayed_line = lineno;
6098 
6099 	view_border(view);
6100 
6101 	return NULL;
6102 }
6103 
6104 static const struct got_error *
6105 blame_cb(void *arg, int nlines, int lineno,
6106     struct got_commit_object *commit, struct got_object_id *id)
6107 {
6108 	const struct got_error *err = NULL;
6109 	struct tog_blame_cb_args *a = arg;
6110 	struct tog_blame_line *line;
6111 	int errcode;
6112 
6113 	if (nlines != a->nlines ||
6114 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6115 		return got_error(GOT_ERR_RANGE);
6116 
6117 	errcode = pthread_mutex_lock(&tog_mutex);
6118 	if (errcode)
6119 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6120 
6121 	if (*a->quit) {	/* user has quit the blame view */
6122 		err = got_error(GOT_ERR_ITER_COMPLETED);
6123 		goto done;
6124 	}
6125 
6126 	if (lineno == -1)
6127 		goto done; /* no change in this commit */
6128 
6129 	line = &a->lines[lineno - 1];
6130 	if (line->annotated)
6131 		goto done;
6132 
6133 	line->id = got_object_id_dup(id);
6134 	if (line->id == NULL) {
6135 		err = got_error_from_errno("got_object_id_dup");
6136 		goto done;
6137 	}
6138 	line->annotated = 1;
6139 done:
6140 	errcode = pthread_mutex_unlock(&tog_mutex);
6141 	if (errcode)
6142 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6143 	return err;
6144 }
6145 
6146 static void *
6147 blame_thread(void *arg)
6148 {
6149 	const struct got_error *err, *close_err;
6150 	struct tog_blame_thread_args *ta = arg;
6151 	struct tog_blame_cb_args *a = ta->cb_args;
6152 	int errcode, fd1 = -1, fd2 = -1;
6153 	FILE *f1 = NULL, *f2 = NULL;
6154 
6155 	fd1 = got_opentempfd();
6156 	if (fd1 == -1)
6157 		return (void *)got_error_from_errno("got_opentempfd");
6158 
6159 	fd2 = got_opentempfd();
6160 	if (fd2 == -1) {
6161 		err = got_error_from_errno("got_opentempfd");
6162 		goto done;
6163 	}
6164 
6165 	f1 = got_opentemp();
6166 	if (f1 == NULL) {
6167 		err = (void *)got_error_from_errno("got_opentemp");
6168 		goto done;
6169 	}
6170 	f2 = got_opentemp();
6171 	if (f2 == NULL) {
6172 		err = (void *)got_error_from_errno("got_opentemp");
6173 		goto done;
6174 	}
6175 
6176 	err = block_signals_used_by_main_thread();
6177 	if (err)
6178 		goto done;
6179 
6180 	err = got_blame(ta->path, a->commit_id, ta->repo,
6181 	    tog_diff_algo, blame_cb, ta->cb_args,
6182 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6183 	if (err && err->code == GOT_ERR_CANCELLED)
6184 		err = NULL;
6185 
6186 	errcode = pthread_mutex_lock(&tog_mutex);
6187 	if (errcode) {
6188 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6189 		goto done;
6190 	}
6191 
6192 	close_err = got_repo_close(ta->repo);
6193 	if (err == NULL)
6194 		err = close_err;
6195 	ta->repo = NULL;
6196 	*ta->complete = 1;
6197 
6198 	errcode = pthread_mutex_unlock(&tog_mutex);
6199 	if (errcode && err == NULL)
6200 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6201 
6202 done:
6203 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6204 		err = got_error_from_errno("close");
6205 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6206 		err = got_error_from_errno("close");
6207 	if (f1 && fclose(f1) == EOF && err == NULL)
6208 		err = got_error_from_errno("fclose");
6209 	if (f2 && fclose(f2) == EOF && err == NULL)
6210 		err = got_error_from_errno("fclose");
6211 
6212 	return (void *)err;
6213 }
6214 
6215 static struct got_object_id *
6216 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6217     int first_displayed_line, int selected_line)
6218 {
6219 	struct tog_blame_line *line;
6220 
6221 	if (nlines <= 0)
6222 		return NULL;
6223 
6224 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6225 	if (!line->annotated)
6226 		return NULL;
6227 
6228 	return line->id;
6229 }
6230 
6231 static struct got_object_id *
6232 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6233     int lineno)
6234 {
6235 	struct tog_blame_line *line;
6236 
6237 	if (nlines <= 0 || lineno >= nlines)
6238 		return NULL;
6239 
6240 	line = &lines[lineno - 1];
6241 	if (!line->annotated)
6242 		return NULL;
6243 
6244 	return line->id;
6245 }
6246 
6247 static const struct got_error *
6248 stop_blame(struct tog_blame *blame)
6249 {
6250 	const struct got_error *err = NULL;
6251 	int i;
6252 
6253 	if (blame->thread) {
6254 		int errcode;
6255 		errcode = pthread_mutex_unlock(&tog_mutex);
6256 		if (errcode)
6257 			return got_error_set_errno(errcode,
6258 			    "pthread_mutex_unlock");
6259 		errcode = pthread_join(blame->thread, (void **)&err);
6260 		if (errcode)
6261 			return got_error_set_errno(errcode, "pthread_join");
6262 		errcode = pthread_mutex_lock(&tog_mutex);
6263 		if (errcode)
6264 			return got_error_set_errno(errcode,
6265 			    "pthread_mutex_lock");
6266 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6267 			err = NULL;
6268 		blame->thread = NULL;
6269 	}
6270 	if (blame->thread_args.repo) {
6271 		const struct got_error *close_err;
6272 		close_err = got_repo_close(blame->thread_args.repo);
6273 		if (err == NULL)
6274 			err = close_err;
6275 		blame->thread_args.repo = NULL;
6276 	}
6277 	if (blame->f) {
6278 		if (fclose(blame->f) == EOF && err == NULL)
6279 			err = got_error_from_errno("fclose");
6280 		blame->f = NULL;
6281 	}
6282 	if (blame->lines) {
6283 		for (i = 0; i < blame->nlines; i++)
6284 			free(blame->lines[i].id);
6285 		free(blame->lines);
6286 		blame->lines = NULL;
6287 	}
6288 	free(blame->cb_args.commit_id);
6289 	blame->cb_args.commit_id = NULL;
6290 	if (blame->pack_fds) {
6291 		const struct got_error *pack_err =
6292 		    got_repo_pack_fds_close(blame->pack_fds);
6293 		if (err == NULL)
6294 			err = pack_err;
6295 		blame->pack_fds = NULL;
6296 	}
6297 	return err;
6298 }
6299 
6300 static const struct got_error *
6301 cancel_blame_view(void *arg)
6302 {
6303 	const struct got_error *err = NULL;
6304 	int *done = arg;
6305 	int errcode;
6306 
6307 	errcode = pthread_mutex_lock(&tog_mutex);
6308 	if (errcode)
6309 		return got_error_set_errno(errcode,
6310 		    "pthread_mutex_unlock");
6311 
6312 	if (*done)
6313 		err = got_error(GOT_ERR_CANCELLED);
6314 
6315 	errcode = pthread_mutex_unlock(&tog_mutex);
6316 	if (errcode)
6317 		return got_error_set_errno(errcode,
6318 		    "pthread_mutex_lock");
6319 
6320 	return err;
6321 }
6322 
6323 static const struct got_error *
6324 run_blame(struct tog_view *view)
6325 {
6326 	struct tog_blame_view_state *s = &view->state.blame;
6327 	struct tog_blame *blame = &s->blame;
6328 	const struct got_error *err = NULL;
6329 	struct got_commit_object *commit = NULL;
6330 	struct got_blob_object *blob = NULL;
6331 	struct got_repository *thread_repo = NULL;
6332 	struct got_object_id *obj_id = NULL;
6333 	int obj_type, fd = -1;
6334 	int *pack_fds = NULL;
6335 
6336 	err = got_object_open_as_commit(&commit, s->repo,
6337 	    &s->blamed_commit->id);
6338 	if (err)
6339 		return err;
6340 
6341 	fd = got_opentempfd();
6342 	if (fd == -1) {
6343 		err = got_error_from_errno("got_opentempfd");
6344 		goto done;
6345 	}
6346 
6347 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6348 	if (err)
6349 		goto done;
6350 
6351 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6352 	if (err)
6353 		goto done;
6354 
6355 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6356 		err = got_error(GOT_ERR_OBJ_TYPE);
6357 		goto done;
6358 	}
6359 
6360 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6361 	if (err)
6362 		goto done;
6363 	blame->f = got_opentemp();
6364 	if (blame->f == NULL) {
6365 		err = got_error_from_errno("got_opentemp");
6366 		goto done;
6367 	}
6368 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6369 	    &blame->line_offsets, blame->f, blob);
6370 	if (err)
6371 		goto done;
6372 	if (blame->nlines == 0) {
6373 		s->blame_complete = 1;
6374 		goto done;
6375 	}
6376 
6377 	/* Don't include \n at EOF in the blame line count. */
6378 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6379 		blame->nlines--;
6380 
6381 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6382 	if (blame->lines == NULL) {
6383 		err = got_error_from_errno("calloc");
6384 		goto done;
6385 	}
6386 
6387 	err = got_repo_pack_fds_open(&pack_fds);
6388 	if (err)
6389 		goto done;
6390 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6391 	    pack_fds);
6392 	if (err)
6393 		goto done;
6394 
6395 	blame->pack_fds = pack_fds;
6396 	blame->cb_args.view = view;
6397 	blame->cb_args.lines = blame->lines;
6398 	blame->cb_args.nlines = blame->nlines;
6399 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6400 	if (blame->cb_args.commit_id == NULL) {
6401 		err = got_error_from_errno("got_object_id_dup");
6402 		goto done;
6403 	}
6404 	blame->cb_args.quit = &s->done;
6405 
6406 	blame->thread_args.path = s->path;
6407 	blame->thread_args.repo = thread_repo;
6408 	blame->thread_args.cb_args = &blame->cb_args;
6409 	blame->thread_args.complete = &s->blame_complete;
6410 	blame->thread_args.cancel_cb = cancel_blame_view;
6411 	blame->thread_args.cancel_arg = &s->done;
6412 	s->blame_complete = 0;
6413 
6414 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6415 		s->first_displayed_line = 1;
6416 		s->last_displayed_line = view->nlines;
6417 		s->selected_line = 1;
6418 	}
6419 	s->matched_line = 0;
6420 
6421 done:
6422 	if (commit)
6423 		got_object_commit_close(commit);
6424 	if (fd != -1 && close(fd) == -1 && err == NULL)
6425 		err = got_error_from_errno("close");
6426 	if (blob)
6427 		got_object_blob_close(blob);
6428 	free(obj_id);
6429 	if (err)
6430 		stop_blame(blame);
6431 	return err;
6432 }
6433 
6434 static const struct got_error *
6435 open_blame_view(struct tog_view *view, char *path,
6436     struct got_object_id *commit_id, struct got_repository *repo)
6437 {
6438 	const struct got_error *err = NULL;
6439 	struct tog_blame_view_state *s = &view->state.blame;
6440 
6441 	STAILQ_INIT(&s->blamed_commits);
6442 
6443 	s->path = strdup(path);
6444 	if (s->path == NULL)
6445 		return got_error_from_errno("strdup");
6446 
6447 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6448 	if (err) {
6449 		free(s->path);
6450 		return err;
6451 	}
6452 
6453 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6454 	s->first_displayed_line = 1;
6455 	s->last_displayed_line = view->nlines;
6456 	s->selected_line = 1;
6457 	s->blame_complete = 0;
6458 	s->repo = repo;
6459 	s->commit_id = commit_id;
6460 	memset(&s->blame, 0, sizeof(s->blame));
6461 
6462 	STAILQ_INIT(&s->colors);
6463 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6464 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6465 		    get_color_value("TOG_COLOR_COMMIT"));
6466 		if (err)
6467 			return err;
6468 	}
6469 
6470 	view->show = show_blame_view;
6471 	view->input = input_blame_view;
6472 	view->reset = reset_blame_view;
6473 	view->close = close_blame_view;
6474 	view->search_start = search_start_blame_view;
6475 	view->search_setup = search_setup_blame_view;
6476 	view->search_next = search_next_view_match;
6477 
6478 	return run_blame(view);
6479 }
6480 
6481 static const struct got_error *
6482 close_blame_view(struct tog_view *view)
6483 {
6484 	const struct got_error *err = NULL;
6485 	struct tog_blame_view_state *s = &view->state.blame;
6486 
6487 	if (s->blame.thread)
6488 		err = stop_blame(&s->blame);
6489 
6490 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6491 		struct got_object_qid *blamed_commit;
6492 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6493 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6494 		got_object_qid_free(blamed_commit);
6495 	}
6496 
6497 	free(s->path);
6498 	free_colors(&s->colors);
6499 	return err;
6500 }
6501 
6502 static const struct got_error *
6503 search_start_blame_view(struct tog_view *view)
6504 {
6505 	struct tog_blame_view_state *s = &view->state.blame;
6506 
6507 	s->matched_line = 0;
6508 	return NULL;
6509 }
6510 
6511 static void
6512 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6513     size_t *nlines, int **first, int **last, int **match, int **selected)
6514 {
6515 	struct tog_blame_view_state *s = &view->state.blame;
6516 
6517 	*f = s->blame.f;
6518 	*nlines = s->blame.nlines;
6519 	*line_offsets = s->blame.line_offsets;
6520 	*match = &s->matched_line;
6521 	*first = &s->first_displayed_line;
6522 	*last = &s->last_displayed_line;
6523 	*selected = &s->selected_line;
6524 }
6525 
6526 static const struct got_error *
6527 show_blame_view(struct tog_view *view)
6528 {
6529 	const struct got_error *err = NULL;
6530 	struct tog_blame_view_state *s = &view->state.blame;
6531 	int errcode;
6532 
6533 	if (s->blame.thread == NULL && !s->blame_complete) {
6534 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6535 		    &s->blame.thread_args);
6536 		if (errcode)
6537 			return got_error_set_errno(errcode, "pthread_create");
6538 
6539 		if (!using_mock_io)
6540 			halfdelay(1); /* fast refresh while annotating  */
6541 	}
6542 
6543 	if (s->blame_complete && !using_mock_io)
6544 		halfdelay(10); /* disable fast refresh */
6545 
6546 	err = draw_blame(view);
6547 
6548 	view_border(view);
6549 	return err;
6550 }
6551 
6552 static const struct got_error *
6553 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6554     struct got_repository *repo, struct got_object_id *id)
6555 {
6556 	struct tog_view		*log_view;
6557 	const struct got_error	*err = NULL;
6558 
6559 	*new_view = NULL;
6560 
6561 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6562 	if (log_view == NULL)
6563 		return got_error_from_errno("view_open");
6564 
6565 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6566 	if (err)
6567 		view_close(log_view);
6568 	else
6569 		*new_view = log_view;
6570 
6571 	return err;
6572 }
6573 
6574 static const struct got_error *
6575 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6576 {
6577 	const struct got_error *err = NULL, *thread_err = NULL;
6578 	struct tog_view *diff_view;
6579 	struct tog_blame_view_state *s = &view->state.blame;
6580 	int eos, nscroll, begin_y = 0, begin_x = 0;
6581 
6582 	eos = nscroll = view->nlines - 2;
6583 	if (view_is_hsplit_top(view))
6584 		--eos;  /* border */
6585 
6586 	switch (ch) {
6587 	case '0':
6588 	case '$':
6589 	case KEY_RIGHT:
6590 	case 'l':
6591 	case KEY_LEFT:
6592 	case 'h':
6593 		horizontal_scroll_input(view, ch);
6594 		break;
6595 	case 'q':
6596 		s->done = 1;
6597 		break;
6598 	case 'g':
6599 	case KEY_HOME:
6600 		s->selected_line = 1;
6601 		s->first_displayed_line = 1;
6602 		view->count = 0;
6603 		break;
6604 	case 'G':
6605 	case KEY_END:
6606 		if (s->blame.nlines < eos) {
6607 			s->selected_line = s->blame.nlines;
6608 			s->first_displayed_line = 1;
6609 		} else {
6610 			s->selected_line = eos;
6611 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6612 		}
6613 		view->count = 0;
6614 		break;
6615 	case 'k':
6616 	case KEY_UP:
6617 	case CTRL('p'):
6618 		if (s->selected_line > 1)
6619 			s->selected_line--;
6620 		else if (s->selected_line == 1 &&
6621 		    s->first_displayed_line > 1)
6622 			s->first_displayed_line--;
6623 		else
6624 			view->count = 0;
6625 		break;
6626 	case CTRL('u'):
6627 	case 'u':
6628 		nscroll /= 2;
6629 		/* FALL THROUGH */
6630 	case KEY_PPAGE:
6631 	case CTRL('b'):
6632 	case 'b':
6633 		if (s->first_displayed_line == 1) {
6634 			if (view->count > 1)
6635 				nscroll += nscroll;
6636 			s->selected_line = MAX(1, s->selected_line - nscroll);
6637 			view->count = 0;
6638 			break;
6639 		}
6640 		if (s->first_displayed_line > nscroll)
6641 			s->first_displayed_line -= nscroll;
6642 		else
6643 			s->first_displayed_line = 1;
6644 		break;
6645 	case 'j':
6646 	case KEY_DOWN:
6647 	case CTRL('n'):
6648 		if (s->selected_line < eos && s->first_displayed_line +
6649 		    s->selected_line <= s->blame.nlines)
6650 			s->selected_line++;
6651 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6652 			s->first_displayed_line++;
6653 		else
6654 			view->count = 0;
6655 		break;
6656 	case 'c':
6657 	case 'p': {
6658 		struct got_object_id *id = NULL;
6659 
6660 		view->count = 0;
6661 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6662 		    s->first_displayed_line, s->selected_line);
6663 		if (id == NULL)
6664 			break;
6665 		if (ch == 'p') {
6666 			struct got_commit_object *commit, *pcommit;
6667 			struct got_object_qid *pid;
6668 			struct got_object_id *blob_id = NULL;
6669 			int obj_type;
6670 			err = got_object_open_as_commit(&commit,
6671 			    s->repo, id);
6672 			if (err)
6673 				break;
6674 			pid = STAILQ_FIRST(
6675 			    got_object_commit_get_parent_ids(commit));
6676 			if (pid == NULL) {
6677 				got_object_commit_close(commit);
6678 				break;
6679 			}
6680 			/* Check if path history ends here. */
6681 			err = got_object_open_as_commit(&pcommit,
6682 			    s->repo, &pid->id);
6683 			if (err)
6684 				break;
6685 			err = got_object_id_by_path(&blob_id, s->repo,
6686 			    pcommit, s->path);
6687 			got_object_commit_close(pcommit);
6688 			if (err) {
6689 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6690 					err = NULL;
6691 				got_object_commit_close(commit);
6692 				break;
6693 			}
6694 			err = got_object_get_type(&obj_type, s->repo,
6695 			    blob_id);
6696 			free(blob_id);
6697 			/* Can't blame non-blob type objects. */
6698 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6699 				got_object_commit_close(commit);
6700 				break;
6701 			}
6702 			err = got_object_qid_alloc(&s->blamed_commit,
6703 			    &pid->id);
6704 			got_object_commit_close(commit);
6705 		} else {
6706 			if (got_object_id_cmp(id,
6707 			    &s->blamed_commit->id) == 0)
6708 				break;
6709 			err = got_object_qid_alloc(&s->blamed_commit,
6710 			    id);
6711 		}
6712 		if (err)
6713 			break;
6714 		s->done = 1;
6715 		thread_err = stop_blame(&s->blame);
6716 		s->done = 0;
6717 		if (thread_err)
6718 			break;
6719 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6720 		    s->blamed_commit, entry);
6721 		err = run_blame(view);
6722 		if (err)
6723 			break;
6724 		break;
6725 	}
6726 	case 'C': {
6727 		struct got_object_qid *first;
6728 
6729 		view->count = 0;
6730 		first = STAILQ_FIRST(&s->blamed_commits);
6731 		if (!got_object_id_cmp(&first->id, s->commit_id))
6732 			break;
6733 		s->done = 1;
6734 		thread_err = stop_blame(&s->blame);
6735 		s->done = 0;
6736 		if (thread_err)
6737 			break;
6738 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6739 		got_object_qid_free(s->blamed_commit);
6740 		s->blamed_commit =
6741 		    STAILQ_FIRST(&s->blamed_commits);
6742 		err = run_blame(view);
6743 		if (err)
6744 			break;
6745 		break;
6746 	}
6747 	case 'L':
6748 		view->count = 0;
6749 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6750 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6751 		if (s->id_to_log)
6752 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6753 		break;
6754 	case KEY_ENTER:
6755 	case '\r': {
6756 		struct got_object_id *id = NULL;
6757 		struct got_object_qid *pid;
6758 		struct got_commit_object *commit = NULL;
6759 
6760 		view->count = 0;
6761 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6762 		    s->first_displayed_line, s->selected_line);
6763 		if (id == NULL)
6764 			break;
6765 		err = got_object_open_as_commit(&commit, s->repo, id);
6766 		if (err)
6767 			break;
6768 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6769 		if (*new_view) {
6770 			/* traversed from diff view, release diff resources  */
6771 			err = close_diff_view(*new_view);
6772 			if (err)
6773 				break;
6774 			diff_view = *new_view;
6775 		} else {
6776 			if (view_is_parent_view(view))
6777 				view_get_split(view, &begin_y, &begin_x);
6778 
6779 			diff_view = view_open(0, 0, begin_y, begin_x,
6780 			    TOG_VIEW_DIFF);
6781 			if (diff_view == NULL) {
6782 				got_object_commit_close(commit);
6783 				err = got_error_from_errno("view_open");
6784 				break;
6785 			}
6786 		}
6787 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6788 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6789 		got_object_commit_close(commit);
6790 		if (err) {
6791 			view_close(diff_view);
6792 			break;
6793 		}
6794 		s->last_diffed_line = s->first_displayed_line - 1 +
6795 		    s->selected_line;
6796 		if (*new_view)
6797 			break;	/* still open from active diff view */
6798 		if (view_is_parent_view(view) &&
6799 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6800 			err = view_init_hsplit(view, begin_y);
6801 			if (err)
6802 				break;
6803 		}
6804 
6805 		view->focussed = 0;
6806 		diff_view->focussed = 1;
6807 		diff_view->mode = view->mode;
6808 		diff_view->nlines = view->lines - begin_y;
6809 		if (view_is_parent_view(view)) {
6810 			view_transfer_size(diff_view, view);
6811 			err = view_close_child(view);
6812 			if (err)
6813 				break;
6814 			err = view_set_child(view, diff_view);
6815 			if (err)
6816 				break;
6817 			view->focus_child = 1;
6818 		} else
6819 			*new_view = diff_view;
6820 		if (err)
6821 			break;
6822 		break;
6823 	}
6824 	case CTRL('d'):
6825 	case 'd':
6826 		nscroll /= 2;
6827 		/* FALL THROUGH */
6828 	case KEY_NPAGE:
6829 	case CTRL('f'):
6830 	case 'f':
6831 	case ' ':
6832 		if (s->last_displayed_line >= s->blame.nlines &&
6833 		    s->selected_line >= MIN(s->blame.nlines,
6834 		    view->nlines - 2)) {
6835 			view->count = 0;
6836 			break;
6837 		}
6838 		if (s->last_displayed_line >= s->blame.nlines &&
6839 		    s->selected_line < view->nlines - 2) {
6840 			s->selected_line +=
6841 			    MIN(nscroll, s->last_displayed_line -
6842 			    s->first_displayed_line - s->selected_line + 1);
6843 		}
6844 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6845 			s->first_displayed_line += nscroll;
6846 		else
6847 			s->first_displayed_line =
6848 			    s->blame.nlines - (view->nlines - 3);
6849 		break;
6850 	case KEY_RESIZE:
6851 		if (s->selected_line > view->nlines - 2) {
6852 			s->selected_line = MIN(s->blame.nlines,
6853 			    view->nlines - 2);
6854 		}
6855 		break;
6856 	default:
6857 		view->count = 0;
6858 		break;
6859 	}
6860 	return thread_err ? thread_err : err;
6861 }
6862 
6863 static const struct got_error *
6864 reset_blame_view(struct tog_view *view)
6865 {
6866 	const struct got_error *err;
6867 	struct tog_blame_view_state *s = &view->state.blame;
6868 
6869 	view->count = 0;
6870 	s->done = 1;
6871 	err = stop_blame(&s->blame);
6872 	s->done = 0;
6873 	if (err)
6874 		return err;
6875 	return run_blame(view);
6876 }
6877 
6878 static const struct got_error *
6879 cmd_blame(int argc, char *argv[])
6880 {
6881 	const struct got_error *error;
6882 	struct got_repository *repo = NULL;
6883 	struct got_worktree *worktree = NULL;
6884 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6885 	char *link_target = NULL;
6886 	struct got_object_id *commit_id = NULL;
6887 	struct got_commit_object *commit = NULL;
6888 	char *commit_id_str = NULL;
6889 	int ch;
6890 	struct tog_view *view;
6891 	int *pack_fds = NULL;
6892 
6893 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6894 		switch (ch) {
6895 		case 'c':
6896 			commit_id_str = optarg;
6897 			break;
6898 		case 'r':
6899 			repo_path = realpath(optarg, NULL);
6900 			if (repo_path == NULL)
6901 				return got_error_from_errno2("realpath",
6902 				    optarg);
6903 			break;
6904 		default:
6905 			usage_blame();
6906 			/* NOTREACHED */
6907 		}
6908 	}
6909 
6910 	argc -= optind;
6911 	argv += optind;
6912 
6913 	if (argc != 1)
6914 		usage_blame();
6915 
6916 	error = got_repo_pack_fds_open(&pack_fds);
6917 	if (error != NULL)
6918 		goto done;
6919 
6920 	if (repo_path == NULL) {
6921 		cwd = getcwd(NULL, 0);
6922 		if (cwd == NULL)
6923 			return got_error_from_errno("getcwd");
6924 		error = got_worktree_open(&worktree, cwd);
6925 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6926 			goto done;
6927 		if (worktree)
6928 			repo_path =
6929 			    strdup(got_worktree_get_repo_path(worktree));
6930 		else
6931 			repo_path = strdup(cwd);
6932 		if (repo_path == NULL) {
6933 			error = got_error_from_errno("strdup");
6934 			goto done;
6935 		}
6936 	}
6937 
6938 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6939 	if (error != NULL)
6940 		goto done;
6941 
6942 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6943 	    worktree);
6944 	if (error)
6945 		goto done;
6946 
6947 	init_curses();
6948 
6949 	error = apply_unveil(got_repo_get_path(repo), NULL);
6950 	if (error)
6951 		goto done;
6952 
6953 	error = tog_load_refs(repo, 0);
6954 	if (error)
6955 		goto done;
6956 
6957 	if (commit_id_str == NULL) {
6958 		struct got_reference *head_ref;
6959 		error = got_ref_open(&head_ref, repo, worktree ?
6960 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6961 		if (error != NULL)
6962 			goto done;
6963 		error = got_ref_resolve(&commit_id, repo, head_ref);
6964 		got_ref_close(head_ref);
6965 	} else {
6966 		error = got_repo_match_object_id(&commit_id, NULL,
6967 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6968 	}
6969 	if (error != NULL)
6970 		goto done;
6971 
6972 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6973 	if (view == NULL) {
6974 		error = got_error_from_errno("view_open");
6975 		goto done;
6976 	}
6977 
6978 	error = got_object_open_as_commit(&commit, repo, commit_id);
6979 	if (error)
6980 		goto done;
6981 
6982 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6983 	    commit, repo);
6984 	if (error)
6985 		goto done;
6986 
6987 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6988 	    commit_id, repo);
6989 	if (error)
6990 		goto done;
6991 	if (worktree) {
6992 		/* Release work tree lock. */
6993 		got_worktree_close(worktree);
6994 		worktree = NULL;
6995 	}
6996 	error = view_loop(view);
6997 done:
6998 	free(repo_path);
6999 	free(in_repo_path);
7000 	free(link_target);
7001 	free(cwd);
7002 	free(commit_id);
7003 	if (commit)
7004 		got_object_commit_close(commit);
7005 	if (worktree)
7006 		got_worktree_close(worktree);
7007 	if (repo) {
7008 		const struct got_error *close_err = got_repo_close(repo);
7009 		if (error == NULL)
7010 			error = close_err;
7011 	}
7012 	if (pack_fds) {
7013 		const struct got_error *pack_err =
7014 		    got_repo_pack_fds_close(pack_fds);
7015 		if (error == NULL)
7016 			error = pack_err;
7017 	}
7018 	tog_free_refs();
7019 	return error;
7020 }
7021 
7022 static const struct got_error *
7023 draw_tree_entries(struct tog_view *view, const char *parent_path)
7024 {
7025 	struct tog_tree_view_state *s = &view->state.tree;
7026 	const struct got_error *err = NULL;
7027 	struct got_tree_entry *te;
7028 	wchar_t *wline;
7029 	char *index = NULL;
7030 	struct tog_color *tc;
7031 	int width, n, nentries, scrollx, i = 1;
7032 	int limit = view->nlines;
7033 
7034 	s->ndisplayed = 0;
7035 	if (view_is_hsplit_top(view))
7036 		--limit;  /* border */
7037 
7038 	werase(view->window);
7039 
7040 	if (limit == 0)
7041 		return NULL;
7042 
7043 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7044 	    0, 0);
7045 	if (err)
7046 		return err;
7047 	if (view_needs_focus_indication(view))
7048 		wstandout(view->window);
7049 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7050 	if (tc)
7051 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7052 	waddwstr(view->window, wline);
7053 	free(wline);
7054 	wline = NULL;
7055 	while (width++ < view->ncols)
7056 		waddch(view->window, ' ');
7057 	if (tc)
7058 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7059 	if (view_needs_focus_indication(view))
7060 		wstandend(view->window);
7061 	if (--limit <= 0)
7062 		return NULL;
7063 
7064 	i += s->selected;
7065 	if (s->first_displayed_entry) {
7066 		i += got_tree_entry_get_index(s->first_displayed_entry);
7067 		if (s->tree != s->root)
7068 			++i;  /* account for ".." entry */
7069 	}
7070 	nentries = got_object_tree_get_nentries(s->tree);
7071 	if (asprintf(&index, "[%d/%d] %s",
7072 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7073 		return got_error_from_errno("asprintf");
7074 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7075 	free(index);
7076 	if (err)
7077 		return err;
7078 	waddwstr(view->window, wline);
7079 	free(wline);
7080 	wline = NULL;
7081 	if (width < view->ncols - 1)
7082 		waddch(view->window, '\n');
7083 	if (--limit <= 0)
7084 		return NULL;
7085 	waddch(view->window, '\n');
7086 	if (--limit <= 0)
7087 		return NULL;
7088 
7089 	if (s->first_displayed_entry == NULL) {
7090 		te = got_object_tree_get_first_entry(s->tree);
7091 		if (s->selected == 0) {
7092 			if (view->focussed)
7093 				wstandout(view->window);
7094 			s->selected_entry = NULL;
7095 		}
7096 		waddstr(view->window, "  ..\n");	/* parent directory */
7097 		if (s->selected == 0 && view->focussed)
7098 			wstandend(view->window);
7099 		s->ndisplayed++;
7100 		if (--limit <= 0)
7101 			return NULL;
7102 		n = 1;
7103 	} else {
7104 		n = 0;
7105 		te = s->first_displayed_entry;
7106 	}
7107 
7108 	view->maxx = 0;
7109 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7110 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7111 		const char *modestr = "";
7112 		mode_t mode;
7113 
7114 		te = got_object_tree_get_entry(s->tree, i);
7115 		mode = got_tree_entry_get_mode(te);
7116 
7117 		if (s->show_ids) {
7118 			err = got_object_id_str(&id_str,
7119 			    got_tree_entry_get_id(te));
7120 			if (err)
7121 				return got_error_from_errno(
7122 				    "got_object_id_str");
7123 		}
7124 		if (got_object_tree_entry_is_submodule(te))
7125 			modestr = "$";
7126 		else if (S_ISLNK(mode)) {
7127 			int i;
7128 
7129 			err = got_tree_entry_get_symlink_target(&link_target,
7130 			    te, s->repo);
7131 			if (err) {
7132 				free(id_str);
7133 				return err;
7134 			}
7135 			for (i = 0; i < strlen(link_target); i++) {
7136 				if (!isprint((unsigned char)link_target[i]))
7137 					link_target[i] = '?';
7138 			}
7139 			modestr = "@";
7140 		}
7141 		else if (S_ISDIR(mode))
7142 			modestr = "/";
7143 		else if (mode & S_IXUSR)
7144 			modestr = "*";
7145 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7146 		    got_tree_entry_get_name(te), modestr,
7147 		    link_target ? " -> ": "",
7148 		    link_target ? link_target : "") == -1) {
7149 			free(id_str);
7150 			free(link_target);
7151 			return got_error_from_errno("asprintf");
7152 		}
7153 		free(id_str);
7154 		free(link_target);
7155 
7156 		/* use full line width to determine view->maxx */
7157 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7158 		if (err) {
7159 			free(line);
7160 			break;
7161 		}
7162 		view->maxx = MAX(view->maxx, width);
7163 		free(wline);
7164 		wline = NULL;
7165 
7166 		err = format_line(&wline, &width, &scrollx, line, view->x,
7167 		    view->ncols, 0, 0);
7168 		if (err) {
7169 			free(line);
7170 			break;
7171 		}
7172 		if (n == s->selected) {
7173 			if (view->focussed)
7174 				wstandout(view->window);
7175 			s->selected_entry = te;
7176 		}
7177 		tc = match_color(&s->colors, line);
7178 		if (tc)
7179 			wattr_on(view->window,
7180 			    COLOR_PAIR(tc->colorpair), NULL);
7181 		waddwstr(view->window, &wline[scrollx]);
7182 		if (tc)
7183 			wattr_off(view->window,
7184 			    COLOR_PAIR(tc->colorpair), NULL);
7185 		if (width < view->ncols)
7186 			waddch(view->window, '\n');
7187 		if (n == s->selected && view->focussed)
7188 			wstandend(view->window);
7189 		free(line);
7190 		free(wline);
7191 		wline = NULL;
7192 		n++;
7193 		s->ndisplayed++;
7194 		s->last_displayed_entry = te;
7195 		if (--limit <= 0)
7196 			break;
7197 	}
7198 
7199 	return err;
7200 }
7201 
7202 static void
7203 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7204 {
7205 	struct got_tree_entry *te;
7206 	int isroot = s->tree == s->root;
7207 	int i = 0;
7208 
7209 	if (s->first_displayed_entry == NULL)
7210 		return;
7211 
7212 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7213 	while (i++ < maxscroll) {
7214 		if (te == NULL) {
7215 			if (!isroot)
7216 				s->first_displayed_entry = NULL;
7217 			break;
7218 		}
7219 		s->first_displayed_entry = te;
7220 		te = got_tree_entry_get_prev(s->tree, te);
7221 	}
7222 }
7223 
7224 static const struct got_error *
7225 tree_scroll_down(struct tog_view *view, int maxscroll)
7226 {
7227 	struct tog_tree_view_state *s = &view->state.tree;
7228 	struct got_tree_entry *next, *last;
7229 	int n = 0;
7230 
7231 	if (s->first_displayed_entry)
7232 		next = got_tree_entry_get_next(s->tree,
7233 		    s->first_displayed_entry);
7234 	else
7235 		next = got_object_tree_get_first_entry(s->tree);
7236 
7237 	last = s->last_displayed_entry;
7238 	while (next && n++ < maxscroll) {
7239 		if (last) {
7240 			s->last_displayed_entry = last;
7241 			last = got_tree_entry_get_next(s->tree, last);
7242 		}
7243 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7244 			s->first_displayed_entry = next;
7245 			next = got_tree_entry_get_next(s->tree, next);
7246 		}
7247 	}
7248 
7249 	return NULL;
7250 }
7251 
7252 static const struct got_error *
7253 tree_entry_path(char **path, struct tog_parent_trees *parents,
7254     struct got_tree_entry *te)
7255 {
7256 	const struct got_error *err = NULL;
7257 	struct tog_parent_tree *pt;
7258 	size_t len = 2; /* for leading slash and NUL */
7259 
7260 	TAILQ_FOREACH(pt, parents, entry)
7261 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7262 		    + 1 /* slash */;
7263 	if (te)
7264 		len += strlen(got_tree_entry_get_name(te));
7265 
7266 	*path = calloc(1, len);
7267 	if (path == NULL)
7268 		return got_error_from_errno("calloc");
7269 
7270 	(*path)[0] = '/';
7271 	pt = TAILQ_LAST(parents, tog_parent_trees);
7272 	while (pt) {
7273 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7274 		if (strlcat(*path, name, len) >= len) {
7275 			err = got_error(GOT_ERR_NO_SPACE);
7276 			goto done;
7277 		}
7278 		if (strlcat(*path, "/", len) >= len) {
7279 			err = got_error(GOT_ERR_NO_SPACE);
7280 			goto done;
7281 		}
7282 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7283 	}
7284 	if (te) {
7285 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7286 			err = got_error(GOT_ERR_NO_SPACE);
7287 			goto done;
7288 		}
7289 	}
7290 done:
7291 	if (err) {
7292 		free(*path);
7293 		*path = NULL;
7294 	}
7295 	return err;
7296 }
7297 
7298 static const struct got_error *
7299 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7300     struct got_tree_entry *te, struct tog_parent_trees *parents,
7301     struct got_object_id *commit_id, struct got_repository *repo)
7302 {
7303 	const struct got_error *err = NULL;
7304 	char *path;
7305 	struct tog_view *blame_view;
7306 
7307 	*new_view = NULL;
7308 
7309 	err = tree_entry_path(&path, parents, te);
7310 	if (err)
7311 		return err;
7312 
7313 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7314 	if (blame_view == NULL) {
7315 		err = got_error_from_errno("view_open");
7316 		goto done;
7317 	}
7318 
7319 	err = open_blame_view(blame_view, path, commit_id, repo);
7320 	if (err) {
7321 		if (err->code == GOT_ERR_CANCELLED)
7322 			err = NULL;
7323 		view_close(blame_view);
7324 	} else
7325 		*new_view = blame_view;
7326 done:
7327 	free(path);
7328 	return err;
7329 }
7330 
7331 static const struct got_error *
7332 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7333     struct tog_tree_view_state *s)
7334 {
7335 	struct tog_view *log_view;
7336 	const struct got_error *err = NULL;
7337 	char *path;
7338 
7339 	*new_view = NULL;
7340 
7341 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7342 	if (log_view == NULL)
7343 		return got_error_from_errno("view_open");
7344 
7345 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7346 	if (err)
7347 		return err;
7348 
7349 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7350 	    path, 0);
7351 	if (err)
7352 		view_close(log_view);
7353 	else
7354 		*new_view = log_view;
7355 	free(path);
7356 	return err;
7357 }
7358 
7359 static const struct got_error *
7360 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7361     const char *head_ref_name, struct got_repository *repo)
7362 {
7363 	const struct got_error *err = NULL;
7364 	char *commit_id_str = NULL;
7365 	struct tog_tree_view_state *s = &view->state.tree;
7366 	struct got_commit_object *commit = NULL;
7367 
7368 	TAILQ_INIT(&s->parents);
7369 	STAILQ_INIT(&s->colors);
7370 
7371 	s->commit_id = got_object_id_dup(commit_id);
7372 	if (s->commit_id == NULL)
7373 		return got_error_from_errno("got_object_id_dup");
7374 
7375 	err = got_object_open_as_commit(&commit, repo, commit_id);
7376 	if (err)
7377 		goto done;
7378 
7379 	/*
7380 	 * The root is opened here and will be closed when the view is closed.
7381 	 * Any visited subtrees and their path-wise parents are opened and
7382 	 * closed on demand.
7383 	 */
7384 	err = got_object_open_as_tree(&s->root, repo,
7385 	    got_object_commit_get_tree_id(commit));
7386 	if (err)
7387 		goto done;
7388 	s->tree = s->root;
7389 
7390 	err = got_object_id_str(&commit_id_str, commit_id);
7391 	if (err != NULL)
7392 		goto done;
7393 
7394 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7395 		err = got_error_from_errno("asprintf");
7396 		goto done;
7397 	}
7398 
7399 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7400 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7401 	if (head_ref_name) {
7402 		s->head_ref_name = strdup(head_ref_name);
7403 		if (s->head_ref_name == NULL) {
7404 			err = got_error_from_errno("strdup");
7405 			goto done;
7406 		}
7407 	}
7408 	s->repo = repo;
7409 
7410 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7411 		err = add_color(&s->colors, "\\$$",
7412 		    TOG_COLOR_TREE_SUBMODULE,
7413 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7414 		if (err)
7415 			goto done;
7416 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7417 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7418 		if (err)
7419 			goto done;
7420 		err = add_color(&s->colors, "/$",
7421 		    TOG_COLOR_TREE_DIRECTORY,
7422 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7423 		if (err)
7424 			goto done;
7425 
7426 		err = add_color(&s->colors, "\\*$",
7427 		    TOG_COLOR_TREE_EXECUTABLE,
7428 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7429 		if (err)
7430 			goto done;
7431 
7432 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7433 		    get_color_value("TOG_COLOR_COMMIT"));
7434 		if (err)
7435 			goto done;
7436 	}
7437 
7438 	view->show = show_tree_view;
7439 	view->input = input_tree_view;
7440 	view->close = close_tree_view;
7441 	view->search_start = search_start_tree_view;
7442 	view->search_next = search_next_tree_view;
7443 done:
7444 	free(commit_id_str);
7445 	if (commit)
7446 		got_object_commit_close(commit);
7447 	if (err)
7448 		close_tree_view(view);
7449 	return err;
7450 }
7451 
7452 static const struct got_error *
7453 close_tree_view(struct tog_view *view)
7454 {
7455 	struct tog_tree_view_state *s = &view->state.tree;
7456 
7457 	free_colors(&s->colors);
7458 	free(s->tree_label);
7459 	s->tree_label = NULL;
7460 	free(s->commit_id);
7461 	s->commit_id = NULL;
7462 	free(s->head_ref_name);
7463 	s->head_ref_name = NULL;
7464 	while (!TAILQ_EMPTY(&s->parents)) {
7465 		struct tog_parent_tree *parent;
7466 		parent = TAILQ_FIRST(&s->parents);
7467 		TAILQ_REMOVE(&s->parents, parent, entry);
7468 		if (parent->tree != s->root)
7469 			got_object_tree_close(parent->tree);
7470 		free(parent);
7471 
7472 	}
7473 	if (s->tree != NULL && s->tree != s->root)
7474 		got_object_tree_close(s->tree);
7475 	if (s->root)
7476 		got_object_tree_close(s->root);
7477 	return NULL;
7478 }
7479 
7480 static const struct got_error *
7481 search_start_tree_view(struct tog_view *view)
7482 {
7483 	struct tog_tree_view_state *s = &view->state.tree;
7484 
7485 	s->matched_entry = NULL;
7486 	return NULL;
7487 }
7488 
7489 static int
7490 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7491 {
7492 	regmatch_t regmatch;
7493 
7494 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7495 	    0) == 0;
7496 }
7497 
7498 static const struct got_error *
7499 search_next_tree_view(struct tog_view *view)
7500 {
7501 	struct tog_tree_view_state *s = &view->state.tree;
7502 	struct got_tree_entry *te = NULL;
7503 
7504 	if (!view->searching) {
7505 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7506 		return NULL;
7507 	}
7508 
7509 	if (s->matched_entry) {
7510 		if (view->searching == TOG_SEARCH_FORWARD) {
7511 			if (s->selected_entry)
7512 				te = got_tree_entry_get_next(s->tree,
7513 				    s->selected_entry);
7514 			else
7515 				te = got_object_tree_get_first_entry(s->tree);
7516 		} else {
7517 			if (s->selected_entry == NULL)
7518 				te = got_object_tree_get_last_entry(s->tree);
7519 			else
7520 				te = got_tree_entry_get_prev(s->tree,
7521 				    s->selected_entry);
7522 		}
7523 	} else {
7524 		if (s->selected_entry)
7525 			te = s->selected_entry;
7526 		else if (view->searching == TOG_SEARCH_FORWARD)
7527 			te = got_object_tree_get_first_entry(s->tree);
7528 		else
7529 			te = got_object_tree_get_last_entry(s->tree);
7530 	}
7531 
7532 	while (1) {
7533 		if (te == NULL) {
7534 			if (s->matched_entry == NULL) {
7535 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7536 				return NULL;
7537 			}
7538 			if (view->searching == TOG_SEARCH_FORWARD)
7539 				te = got_object_tree_get_first_entry(s->tree);
7540 			else
7541 				te = got_object_tree_get_last_entry(s->tree);
7542 		}
7543 
7544 		if (match_tree_entry(te, &view->regex)) {
7545 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7546 			s->matched_entry = te;
7547 			break;
7548 		}
7549 
7550 		if (view->searching == TOG_SEARCH_FORWARD)
7551 			te = got_tree_entry_get_next(s->tree, te);
7552 		else
7553 			te = got_tree_entry_get_prev(s->tree, te);
7554 	}
7555 
7556 	if (s->matched_entry) {
7557 		s->first_displayed_entry = s->matched_entry;
7558 		s->selected = 0;
7559 	}
7560 
7561 	return NULL;
7562 }
7563 
7564 static const struct got_error *
7565 show_tree_view(struct tog_view *view)
7566 {
7567 	const struct got_error *err = NULL;
7568 	struct tog_tree_view_state *s = &view->state.tree;
7569 	char *parent_path;
7570 
7571 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7572 	if (err)
7573 		return err;
7574 
7575 	err = draw_tree_entries(view, parent_path);
7576 	free(parent_path);
7577 
7578 	view_border(view);
7579 	return err;
7580 }
7581 
7582 static const struct got_error *
7583 tree_goto_line(struct tog_view *view, int nlines)
7584 {
7585 	const struct got_error		 *err = NULL;
7586 	struct tog_tree_view_state	 *s = &view->state.tree;
7587 	struct got_tree_entry		**fte, **lte, **ste;
7588 	int				  g, last, first = 1, i = 1;
7589 	int				  root = s->tree == s->root;
7590 	int				  off = root ? 1 : 2;
7591 
7592 	g = view->gline;
7593 	view->gline = 0;
7594 
7595 	if (g == 0)
7596 		g = 1;
7597 	else if (g > got_object_tree_get_nentries(s->tree))
7598 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7599 
7600 	fte = &s->first_displayed_entry;
7601 	lte = &s->last_displayed_entry;
7602 	ste = &s->selected_entry;
7603 
7604 	if (*fte != NULL) {
7605 		first = got_tree_entry_get_index(*fte);
7606 		first += off;  /* account for ".." */
7607 	}
7608 	last = got_tree_entry_get_index(*lte);
7609 	last += off;
7610 
7611 	if (g >= first && g <= last && g - first < nlines) {
7612 		s->selected = g - first;
7613 		return NULL;	/* gline is on the current page */
7614 	}
7615 
7616 	if (*ste != NULL) {
7617 		i = got_tree_entry_get_index(*ste);
7618 		i += off;
7619 	}
7620 
7621 	if (i < g) {
7622 		err = tree_scroll_down(view, g - i);
7623 		if (err)
7624 			return err;
7625 		if (got_tree_entry_get_index(*lte) >=
7626 		    got_object_tree_get_nentries(s->tree) - 1 &&
7627 		    first + s->selected < g &&
7628 		    s->selected < s->ndisplayed - 1) {
7629 			first = got_tree_entry_get_index(*fte);
7630 			first += off;
7631 			s->selected = g - first;
7632 		}
7633 	} else if (i > g)
7634 		tree_scroll_up(s, i - g);
7635 
7636 	if (g < nlines &&
7637 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7638 		s->selected = g - 1;
7639 
7640 	return NULL;
7641 }
7642 
7643 static const struct got_error *
7644 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7645 {
7646 	const struct got_error *err = NULL;
7647 	struct tog_tree_view_state *s = &view->state.tree;
7648 	struct got_tree_entry *te;
7649 	int n, nscroll = view->nlines - 3;
7650 
7651 	if (view->gline)
7652 		return tree_goto_line(view, nscroll);
7653 
7654 	switch (ch) {
7655 	case '0':
7656 	case '$':
7657 	case KEY_RIGHT:
7658 	case 'l':
7659 	case KEY_LEFT:
7660 	case 'h':
7661 		horizontal_scroll_input(view, ch);
7662 		break;
7663 	case 'i':
7664 		s->show_ids = !s->show_ids;
7665 		view->count = 0;
7666 		break;
7667 	case 'L':
7668 		view->count = 0;
7669 		if (!s->selected_entry)
7670 			break;
7671 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7672 		break;
7673 	case 'R':
7674 		view->count = 0;
7675 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7676 		break;
7677 	case 'g':
7678 	case '=':
7679 	case KEY_HOME:
7680 		s->selected = 0;
7681 		view->count = 0;
7682 		if (s->tree == s->root)
7683 			s->first_displayed_entry =
7684 			    got_object_tree_get_first_entry(s->tree);
7685 		else
7686 			s->first_displayed_entry = NULL;
7687 		break;
7688 	case 'G':
7689 	case '*':
7690 	case KEY_END: {
7691 		int eos = view->nlines - 3;
7692 
7693 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7694 			--eos;  /* border */
7695 		s->selected = 0;
7696 		view->count = 0;
7697 		te = got_object_tree_get_last_entry(s->tree);
7698 		for (n = 0; n < eos; n++) {
7699 			if (te == NULL) {
7700 				if (s->tree != s->root) {
7701 					s->first_displayed_entry = NULL;
7702 					n++;
7703 				}
7704 				break;
7705 			}
7706 			s->first_displayed_entry = te;
7707 			te = got_tree_entry_get_prev(s->tree, te);
7708 		}
7709 		if (n > 0)
7710 			s->selected = n - 1;
7711 		break;
7712 	}
7713 	case 'k':
7714 	case KEY_UP:
7715 	case CTRL('p'):
7716 		if (s->selected > 0) {
7717 			s->selected--;
7718 			break;
7719 		}
7720 		tree_scroll_up(s, 1);
7721 		if (s->selected_entry == NULL ||
7722 		    (s->tree == s->root && s->selected_entry ==
7723 		     got_object_tree_get_first_entry(s->tree)))
7724 			view->count = 0;
7725 		break;
7726 	case CTRL('u'):
7727 	case 'u':
7728 		nscroll /= 2;
7729 		/* FALL THROUGH */
7730 	case KEY_PPAGE:
7731 	case CTRL('b'):
7732 	case 'b':
7733 		if (s->tree == s->root) {
7734 			if (got_object_tree_get_first_entry(s->tree) ==
7735 			    s->first_displayed_entry)
7736 				s->selected -= MIN(s->selected, nscroll);
7737 		} else {
7738 			if (s->first_displayed_entry == NULL)
7739 				s->selected -= MIN(s->selected, nscroll);
7740 		}
7741 		tree_scroll_up(s, MAX(0, nscroll));
7742 		if (s->selected_entry == NULL ||
7743 		    (s->tree == s->root && s->selected_entry ==
7744 		     got_object_tree_get_first_entry(s->tree)))
7745 			view->count = 0;
7746 		break;
7747 	case 'j':
7748 	case KEY_DOWN:
7749 	case CTRL('n'):
7750 		if (s->selected < s->ndisplayed - 1) {
7751 			s->selected++;
7752 			break;
7753 		}
7754 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7755 		    == NULL) {
7756 			/* can't scroll any further */
7757 			view->count = 0;
7758 			break;
7759 		}
7760 		tree_scroll_down(view, 1);
7761 		break;
7762 	case CTRL('d'):
7763 	case 'd':
7764 		nscroll /= 2;
7765 		/* FALL THROUGH */
7766 	case KEY_NPAGE:
7767 	case CTRL('f'):
7768 	case 'f':
7769 	case ' ':
7770 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7771 		    == NULL) {
7772 			/* can't scroll any further; move cursor down */
7773 			if (s->selected < s->ndisplayed - 1)
7774 				s->selected += MIN(nscroll,
7775 				    s->ndisplayed - s->selected - 1);
7776 			else
7777 				view->count = 0;
7778 			break;
7779 		}
7780 		tree_scroll_down(view, nscroll);
7781 		break;
7782 	case KEY_ENTER:
7783 	case '\r':
7784 	case KEY_BACKSPACE:
7785 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7786 			struct tog_parent_tree *parent;
7787 			/* user selected '..' */
7788 			if (s->tree == s->root) {
7789 				view->count = 0;
7790 				break;
7791 			}
7792 			parent = TAILQ_FIRST(&s->parents);
7793 			TAILQ_REMOVE(&s->parents, parent,
7794 			    entry);
7795 			got_object_tree_close(s->tree);
7796 			s->tree = parent->tree;
7797 			s->first_displayed_entry =
7798 			    parent->first_displayed_entry;
7799 			s->selected_entry =
7800 			    parent->selected_entry;
7801 			s->selected = parent->selected;
7802 			if (s->selected > view->nlines - 3) {
7803 				err = offset_selection_down(view);
7804 				if (err)
7805 					break;
7806 			}
7807 			free(parent);
7808 		} else if (S_ISDIR(got_tree_entry_get_mode(
7809 		    s->selected_entry))) {
7810 			struct got_tree_object *subtree;
7811 			view->count = 0;
7812 			err = got_object_open_as_tree(&subtree, s->repo,
7813 			    got_tree_entry_get_id(s->selected_entry));
7814 			if (err)
7815 				break;
7816 			err = tree_view_visit_subtree(s, subtree);
7817 			if (err) {
7818 				got_object_tree_close(subtree);
7819 				break;
7820 			}
7821 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7822 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7823 		break;
7824 	case KEY_RESIZE:
7825 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7826 			s->selected = view->nlines - 4;
7827 		view->count = 0;
7828 		break;
7829 	default:
7830 		view->count = 0;
7831 		break;
7832 	}
7833 
7834 	return err;
7835 }
7836 
7837 __dead static void
7838 usage_tree(void)
7839 {
7840 	endwin();
7841 	fprintf(stderr,
7842 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7843 	    getprogname());
7844 	exit(1);
7845 }
7846 
7847 static const struct got_error *
7848 cmd_tree(int argc, char *argv[])
7849 {
7850 	const struct got_error *error;
7851 	struct got_repository *repo = NULL;
7852 	struct got_worktree *worktree = NULL;
7853 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7854 	struct got_object_id *commit_id = NULL;
7855 	struct got_commit_object *commit = NULL;
7856 	const char *commit_id_arg = NULL;
7857 	char *label = NULL;
7858 	struct got_reference *ref = NULL;
7859 	const char *head_ref_name = NULL;
7860 	int ch;
7861 	struct tog_view *view;
7862 	int *pack_fds = NULL;
7863 
7864 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7865 		switch (ch) {
7866 		case 'c':
7867 			commit_id_arg = optarg;
7868 			break;
7869 		case 'r':
7870 			repo_path = realpath(optarg, NULL);
7871 			if (repo_path == NULL)
7872 				return got_error_from_errno2("realpath",
7873 				    optarg);
7874 			break;
7875 		default:
7876 			usage_tree();
7877 			/* NOTREACHED */
7878 		}
7879 	}
7880 
7881 	argc -= optind;
7882 	argv += optind;
7883 
7884 	if (argc > 1)
7885 		usage_tree();
7886 
7887 	error = got_repo_pack_fds_open(&pack_fds);
7888 	if (error != NULL)
7889 		goto done;
7890 
7891 	if (repo_path == NULL) {
7892 		cwd = getcwd(NULL, 0);
7893 		if (cwd == NULL)
7894 			return got_error_from_errno("getcwd");
7895 		error = got_worktree_open(&worktree, cwd);
7896 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7897 			goto done;
7898 		if (worktree)
7899 			repo_path =
7900 			    strdup(got_worktree_get_repo_path(worktree));
7901 		else
7902 			repo_path = strdup(cwd);
7903 		if (repo_path == NULL) {
7904 			error = got_error_from_errno("strdup");
7905 			goto done;
7906 		}
7907 	}
7908 
7909 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7910 	if (error != NULL)
7911 		goto done;
7912 
7913 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7914 	    repo, worktree);
7915 	if (error)
7916 		goto done;
7917 
7918 	init_curses();
7919 
7920 	error = apply_unveil(got_repo_get_path(repo), NULL);
7921 	if (error)
7922 		goto done;
7923 
7924 	error = tog_load_refs(repo, 0);
7925 	if (error)
7926 		goto done;
7927 
7928 	if (commit_id_arg == NULL) {
7929 		error = got_repo_match_object_id(&commit_id, &label,
7930 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7931 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7932 		if (error)
7933 			goto done;
7934 		head_ref_name = label;
7935 	} else {
7936 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7937 		if (error == NULL)
7938 			head_ref_name = got_ref_get_name(ref);
7939 		else if (error->code != GOT_ERR_NOT_REF)
7940 			goto done;
7941 		error = got_repo_match_object_id(&commit_id, NULL,
7942 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7943 		if (error)
7944 			goto done;
7945 	}
7946 
7947 	error = got_object_open_as_commit(&commit, repo, commit_id);
7948 	if (error)
7949 		goto done;
7950 
7951 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7952 	if (view == NULL) {
7953 		error = got_error_from_errno("view_open");
7954 		goto done;
7955 	}
7956 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7957 	if (error)
7958 		goto done;
7959 	if (!got_path_is_root_dir(in_repo_path)) {
7960 		error = tree_view_walk_path(&view->state.tree, commit,
7961 		    in_repo_path);
7962 		if (error)
7963 			goto done;
7964 	}
7965 
7966 	if (worktree) {
7967 		/* Release work tree lock. */
7968 		got_worktree_close(worktree);
7969 		worktree = NULL;
7970 	}
7971 	error = view_loop(view);
7972 done:
7973 	free(repo_path);
7974 	free(cwd);
7975 	free(commit_id);
7976 	free(label);
7977 	if (ref)
7978 		got_ref_close(ref);
7979 	if (repo) {
7980 		const struct got_error *close_err = got_repo_close(repo);
7981 		if (error == NULL)
7982 			error = close_err;
7983 	}
7984 	if (pack_fds) {
7985 		const struct got_error *pack_err =
7986 		    got_repo_pack_fds_close(pack_fds);
7987 		if (error == NULL)
7988 			error = pack_err;
7989 	}
7990 	tog_free_refs();
7991 	return error;
7992 }
7993 
7994 static const struct got_error *
7995 ref_view_load_refs(struct tog_ref_view_state *s)
7996 {
7997 	struct got_reflist_entry *sre;
7998 	struct tog_reflist_entry *re;
7999 
8000 	s->nrefs = 0;
8001 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8002 		if (strncmp(got_ref_get_name(sre->ref),
8003 		    "refs/got/", 9) == 0 &&
8004 		    strncmp(got_ref_get_name(sre->ref),
8005 		    "refs/got/backup/", 16) != 0)
8006 			continue;
8007 
8008 		re = malloc(sizeof(*re));
8009 		if (re == NULL)
8010 			return got_error_from_errno("malloc");
8011 
8012 		re->ref = got_ref_dup(sre->ref);
8013 		if (re->ref == NULL)
8014 			return got_error_from_errno("got_ref_dup");
8015 		re->idx = s->nrefs++;
8016 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8017 	}
8018 
8019 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8020 	return NULL;
8021 }
8022 
8023 static void
8024 ref_view_free_refs(struct tog_ref_view_state *s)
8025 {
8026 	struct tog_reflist_entry *re;
8027 
8028 	while (!TAILQ_EMPTY(&s->refs)) {
8029 		re = TAILQ_FIRST(&s->refs);
8030 		TAILQ_REMOVE(&s->refs, re, entry);
8031 		got_ref_close(re->ref);
8032 		free(re);
8033 	}
8034 }
8035 
8036 static const struct got_error *
8037 open_ref_view(struct tog_view *view, struct got_repository *repo)
8038 {
8039 	const struct got_error *err = NULL;
8040 	struct tog_ref_view_state *s = &view->state.ref;
8041 
8042 	s->selected_entry = 0;
8043 	s->repo = repo;
8044 
8045 	TAILQ_INIT(&s->refs);
8046 	STAILQ_INIT(&s->colors);
8047 
8048 	err = ref_view_load_refs(s);
8049 	if (err)
8050 		return err;
8051 
8052 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8053 		err = add_color(&s->colors, "^refs/heads/",
8054 		    TOG_COLOR_REFS_HEADS,
8055 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8056 		if (err)
8057 			goto done;
8058 
8059 		err = add_color(&s->colors, "^refs/tags/",
8060 		    TOG_COLOR_REFS_TAGS,
8061 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8062 		if (err)
8063 			goto done;
8064 
8065 		err = add_color(&s->colors, "^refs/remotes/",
8066 		    TOG_COLOR_REFS_REMOTES,
8067 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8068 		if (err)
8069 			goto done;
8070 
8071 		err = add_color(&s->colors, "^refs/got/backup/",
8072 		    TOG_COLOR_REFS_BACKUP,
8073 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8074 		if (err)
8075 			goto done;
8076 	}
8077 
8078 	view->show = show_ref_view;
8079 	view->input = input_ref_view;
8080 	view->close = close_ref_view;
8081 	view->search_start = search_start_ref_view;
8082 	view->search_next = search_next_ref_view;
8083 done:
8084 	if (err)
8085 		free_colors(&s->colors);
8086 	return err;
8087 }
8088 
8089 static const struct got_error *
8090 close_ref_view(struct tog_view *view)
8091 {
8092 	struct tog_ref_view_state *s = &view->state.ref;
8093 
8094 	ref_view_free_refs(s);
8095 	free_colors(&s->colors);
8096 
8097 	return NULL;
8098 }
8099 
8100 static const struct got_error *
8101 resolve_reflist_entry(struct got_object_id **commit_id,
8102     struct tog_reflist_entry *re, struct got_repository *repo)
8103 {
8104 	const struct got_error *err = NULL;
8105 	struct got_object_id *obj_id;
8106 	struct got_tag_object *tag = NULL;
8107 	int obj_type;
8108 
8109 	*commit_id = NULL;
8110 
8111 	err = got_ref_resolve(&obj_id, repo, re->ref);
8112 	if (err)
8113 		return err;
8114 
8115 	err = got_object_get_type(&obj_type, repo, obj_id);
8116 	if (err)
8117 		goto done;
8118 
8119 	switch (obj_type) {
8120 	case GOT_OBJ_TYPE_COMMIT:
8121 		*commit_id = obj_id;
8122 		break;
8123 	case GOT_OBJ_TYPE_TAG:
8124 		err = got_object_open_as_tag(&tag, repo, obj_id);
8125 		if (err)
8126 			goto done;
8127 		free(obj_id);
8128 		err = got_object_get_type(&obj_type, repo,
8129 		    got_object_tag_get_object_id(tag));
8130 		if (err)
8131 			goto done;
8132 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8133 			err = got_error(GOT_ERR_OBJ_TYPE);
8134 			goto done;
8135 		}
8136 		*commit_id = got_object_id_dup(
8137 		    got_object_tag_get_object_id(tag));
8138 		if (*commit_id == NULL) {
8139 			err = got_error_from_errno("got_object_id_dup");
8140 			goto done;
8141 		}
8142 		break;
8143 	default:
8144 		err = got_error(GOT_ERR_OBJ_TYPE);
8145 		break;
8146 	}
8147 
8148 done:
8149 	if (tag)
8150 		got_object_tag_close(tag);
8151 	if (err) {
8152 		free(*commit_id);
8153 		*commit_id = NULL;
8154 	}
8155 	return err;
8156 }
8157 
8158 static const struct got_error *
8159 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8160     struct tog_reflist_entry *re, struct got_repository *repo)
8161 {
8162 	struct tog_view *log_view;
8163 	const struct got_error *err = NULL;
8164 	struct got_object_id *commit_id = NULL;
8165 
8166 	*new_view = NULL;
8167 
8168 	err = resolve_reflist_entry(&commit_id, re, repo);
8169 	if (err) {
8170 		if (err->code != GOT_ERR_OBJ_TYPE)
8171 			return err;
8172 		else
8173 			return NULL;
8174 	}
8175 
8176 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8177 	if (log_view == NULL) {
8178 		err = got_error_from_errno("view_open");
8179 		goto done;
8180 	}
8181 
8182 	err = open_log_view(log_view, commit_id, repo,
8183 	    got_ref_get_name(re->ref), "", 0);
8184 done:
8185 	if (err)
8186 		view_close(log_view);
8187 	else
8188 		*new_view = log_view;
8189 	free(commit_id);
8190 	return err;
8191 }
8192 
8193 static void
8194 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8195 {
8196 	struct tog_reflist_entry *re;
8197 	int i = 0;
8198 
8199 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8200 		return;
8201 
8202 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8203 	while (i++ < maxscroll) {
8204 		if (re == NULL)
8205 			break;
8206 		s->first_displayed_entry = re;
8207 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8208 	}
8209 }
8210 
8211 static const struct got_error *
8212 ref_scroll_down(struct tog_view *view, int maxscroll)
8213 {
8214 	struct tog_ref_view_state *s = &view->state.ref;
8215 	struct tog_reflist_entry *next, *last;
8216 	int n = 0;
8217 
8218 	if (s->first_displayed_entry)
8219 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8220 	else
8221 		next = TAILQ_FIRST(&s->refs);
8222 
8223 	last = s->last_displayed_entry;
8224 	while (next && n++ < maxscroll) {
8225 		if (last) {
8226 			s->last_displayed_entry = last;
8227 			last = TAILQ_NEXT(last, entry);
8228 		}
8229 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8230 			s->first_displayed_entry = next;
8231 			next = TAILQ_NEXT(next, entry);
8232 		}
8233 	}
8234 
8235 	return NULL;
8236 }
8237 
8238 static const struct got_error *
8239 search_start_ref_view(struct tog_view *view)
8240 {
8241 	struct tog_ref_view_state *s = &view->state.ref;
8242 
8243 	s->matched_entry = NULL;
8244 	return NULL;
8245 }
8246 
8247 static int
8248 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8249 {
8250 	regmatch_t regmatch;
8251 
8252 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8253 	    0) == 0;
8254 }
8255 
8256 static const struct got_error *
8257 search_next_ref_view(struct tog_view *view)
8258 {
8259 	struct tog_ref_view_state *s = &view->state.ref;
8260 	struct tog_reflist_entry *re = NULL;
8261 
8262 	if (!view->searching) {
8263 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8264 		return NULL;
8265 	}
8266 
8267 	if (s->matched_entry) {
8268 		if (view->searching == TOG_SEARCH_FORWARD) {
8269 			if (s->selected_entry)
8270 				re = TAILQ_NEXT(s->selected_entry, entry);
8271 			else
8272 				re = TAILQ_PREV(s->selected_entry,
8273 				    tog_reflist_head, entry);
8274 		} else {
8275 			if (s->selected_entry == NULL)
8276 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8277 			else
8278 				re = TAILQ_PREV(s->selected_entry,
8279 				    tog_reflist_head, entry);
8280 		}
8281 	} else {
8282 		if (s->selected_entry)
8283 			re = s->selected_entry;
8284 		else if (view->searching == TOG_SEARCH_FORWARD)
8285 			re = TAILQ_FIRST(&s->refs);
8286 		else
8287 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8288 	}
8289 
8290 	while (1) {
8291 		if (re == NULL) {
8292 			if (s->matched_entry == NULL) {
8293 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8294 				return NULL;
8295 			}
8296 			if (view->searching == TOG_SEARCH_FORWARD)
8297 				re = TAILQ_FIRST(&s->refs);
8298 			else
8299 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8300 		}
8301 
8302 		if (match_reflist_entry(re, &view->regex)) {
8303 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8304 			s->matched_entry = re;
8305 			break;
8306 		}
8307 
8308 		if (view->searching == TOG_SEARCH_FORWARD)
8309 			re = TAILQ_NEXT(re, entry);
8310 		else
8311 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8312 	}
8313 
8314 	if (s->matched_entry) {
8315 		s->first_displayed_entry = s->matched_entry;
8316 		s->selected = 0;
8317 	}
8318 
8319 	return NULL;
8320 }
8321 
8322 static const struct got_error *
8323 show_ref_view(struct tog_view *view)
8324 {
8325 	const struct got_error *err = NULL;
8326 	struct tog_ref_view_state *s = &view->state.ref;
8327 	struct tog_reflist_entry *re;
8328 	char *line = NULL;
8329 	wchar_t *wline;
8330 	struct tog_color *tc;
8331 	int width, n, scrollx;
8332 	int limit = view->nlines;
8333 
8334 	werase(view->window);
8335 
8336 	s->ndisplayed = 0;
8337 	if (view_is_hsplit_top(view))
8338 		--limit;  /* border */
8339 
8340 	if (limit == 0)
8341 		return NULL;
8342 
8343 	re = s->first_displayed_entry;
8344 
8345 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8346 	    s->nrefs) == -1)
8347 		return got_error_from_errno("asprintf");
8348 
8349 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8350 	if (err) {
8351 		free(line);
8352 		return err;
8353 	}
8354 	if (view_needs_focus_indication(view))
8355 		wstandout(view->window);
8356 	waddwstr(view->window, wline);
8357 	while (width++ < view->ncols)
8358 		waddch(view->window, ' ');
8359 	if (view_needs_focus_indication(view))
8360 		wstandend(view->window);
8361 	free(wline);
8362 	wline = NULL;
8363 	free(line);
8364 	line = NULL;
8365 	if (--limit <= 0)
8366 		return NULL;
8367 
8368 	n = 0;
8369 	view->maxx = 0;
8370 	while (re && limit > 0) {
8371 		char *line = NULL;
8372 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8373 
8374 		if (s->show_date) {
8375 			struct got_commit_object *ci;
8376 			struct got_tag_object *tag;
8377 			struct got_object_id *id;
8378 			struct tm tm;
8379 			time_t t;
8380 
8381 			err = got_ref_resolve(&id, s->repo, re->ref);
8382 			if (err)
8383 				return err;
8384 			err = got_object_open_as_tag(&tag, s->repo, id);
8385 			if (err) {
8386 				if (err->code != GOT_ERR_OBJ_TYPE) {
8387 					free(id);
8388 					return err;
8389 				}
8390 				err = got_object_open_as_commit(&ci, s->repo,
8391 				    id);
8392 				if (err) {
8393 					free(id);
8394 					return err;
8395 				}
8396 				t = got_object_commit_get_committer_time(ci);
8397 				got_object_commit_close(ci);
8398 			} else {
8399 				t = got_object_tag_get_tagger_time(tag);
8400 				got_object_tag_close(tag);
8401 			}
8402 			free(id);
8403 			if (gmtime_r(&t, &tm) == NULL)
8404 				return got_error_from_errno("gmtime_r");
8405 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8406 				return got_error(GOT_ERR_NO_SPACE);
8407 		}
8408 		if (got_ref_is_symbolic(re->ref)) {
8409 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8410 			    ymd : "", got_ref_get_name(re->ref),
8411 			    got_ref_get_symref_target(re->ref)) == -1)
8412 				return got_error_from_errno("asprintf");
8413 		} else if (s->show_ids) {
8414 			struct got_object_id *id;
8415 			char *id_str;
8416 			err = got_ref_resolve(&id, s->repo, re->ref);
8417 			if (err)
8418 				return err;
8419 			err = got_object_id_str(&id_str, id);
8420 			if (err) {
8421 				free(id);
8422 				return err;
8423 			}
8424 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8425 			    got_ref_get_name(re->ref), id_str) == -1) {
8426 				err = got_error_from_errno("asprintf");
8427 				free(id);
8428 				free(id_str);
8429 				return err;
8430 			}
8431 			free(id);
8432 			free(id_str);
8433 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8434 		    got_ref_get_name(re->ref)) == -1)
8435 			return got_error_from_errno("asprintf");
8436 
8437 		/* use full line width to determine view->maxx */
8438 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8439 		if (err) {
8440 			free(line);
8441 			return err;
8442 		}
8443 		view->maxx = MAX(view->maxx, width);
8444 		free(wline);
8445 		wline = NULL;
8446 
8447 		err = format_line(&wline, &width, &scrollx, line, view->x,
8448 		    view->ncols, 0, 0);
8449 		if (err) {
8450 			free(line);
8451 			return err;
8452 		}
8453 		if (n == s->selected) {
8454 			if (view->focussed)
8455 				wstandout(view->window);
8456 			s->selected_entry = re;
8457 		}
8458 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8459 		if (tc)
8460 			wattr_on(view->window,
8461 			    COLOR_PAIR(tc->colorpair), NULL);
8462 		waddwstr(view->window, &wline[scrollx]);
8463 		if (tc)
8464 			wattr_off(view->window,
8465 			    COLOR_PAIR(tc->colorpair), NULL);
8466 		if (width < view->ncols)
8467 			waddch(view->window, '\n');
8468 		if (n == s->selected && view->focussed)
8469 			wstandend(view->window);
8470 		free(line);
8471 		free(wline);
8472 		wline = NULL;
8473 		n++;
8474 		s->ndisplayed++;
8475 		s->last_displayed_entry = re;
8476 
8477 		limit--;
8478 		re = TAILQ_NEXT(re, entry);
8479 	}
8480 
8481 	view_border(view);
8482 	return err;
8483 }
8484 
8485 static const struct got_error *
8486 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8487     struct tog_reflist_entry *re, struct got_repository *repo)
8488 {
8489 	const struct got_error *err = NULL;
8490 	struct got_object_id *commit_id = NULL;
8491 	struct tog_view *tree_view;
8492 
8493 	*new_view = NULL;
8494 
8495 	err = resolve_reflist_entry(&commit_id, re, repo);
8496 	if (err) {
8497 		if (err->code != GOT_ERR_OBJ_TYPE)
8498 			return err;
8499 		else
8500 			return NULL;
8501 	}
8502 
8503 
8504 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8505 	if (tree_view == NULL) {
8506 		err = got_error_from_errno("view_open");
8507 		goto done;
8508 	}
8509 
8510 	err = open_tree_view(tree_view, commit_id,
8511 	    got_ref_get_name(re->ref), repo);
8512 	if (err)
8513 		goto done;
8514 
8515 	*new_view = tree_view;
8516 done:
8517 	free(commit_id);
8518 	return err;
8519 }
8520 
8521 static const struct got_error *
8522 ref_goto_line(struct tog_view *view, int nlines)
8523 {
8524 	const struct got_error		*err = NULL;
8525 	struct tog_ref_view_state	*s = &view->state.ref;
8526 	int				 g, idx = s->selected_entry->idx;
8527 
8528 	g = view->gline;
8529 	view->gline = 0;
8530 
8531 	if (g == 0)
8532 		g = 1;
8533 	else if (g > s->nrefs)
8534 		g = s->nrefs;
8535 
8536 	if (g >= s->first_displayed_entry->idx + 1 &&
8537 	    g <= s->last_displayed_entry->idx + 1 &&
8538 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8539 		s->selected = g - s->first_displayed_entry->idx - 1;
8540 		return NULL;
8541 	}
8542 
8543 	if (idx + 1 < g) {
8544 		err = ref_scroll_down(view, g - idx - 1);
8545 		if (err)
8546 			return err;
8547 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8548 		    s->first_displayed_entry->idx + s->selected < g &&
8549 		    s->selected < s->ndisplayed - 1)
8550 			s->selected = g - s->first_displayed_entry->idx - 1;
8551 	} else if (idx + 1 > g)
8552 		ref_scroll_up(s, idx - g + 1);
8553 
8554 	if (g < nlines && s->first_displayed_entry->idx == 0)
8555 		s->selected = g - 1;
8556 
8557 	return NULL;
8558 
8559 }
8560 
8561 static const struct got_error *
8562 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8563 {
8564 	const struct got_error *err = NULL;
8565 	struct tog_ref_view_state *s = &view->state.ref;
8566 	struct tog_reflist_entry *re;
8567 	int n, nscroll = view->nlines - 1;
8568 
8569 	if (view->gline)
8570 		return ref_goto_line(view, nscroll);
8571 
8572 	switch (ch) {
8573 	case '0':
8574 	case '$':
8575 	case KEY_RIGHT:
8576 	case 'l':
8577 	case KEY_LEFT:
8578 	case 'h':
8579 		horizontal_scroll_input(view, ch);
8580 		break;
8581 	case 'i':
8582 		s->show_ids = !s->show_ids;
8583 		view->count = 0;
8584 		break;
8585 	case 'm':
8586 		s->show_date = !s->show_date;
8587 		view->count = 0;
8588 		break;
8589 	case 'o':
8590 		s->sort_by_date = !s->sort_by_date;
8591 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8592 		view->count = 0;
8593 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8594 		    got_ref_cmp_by_commit_timestamp_descending :
8595 		    tog_ref_cmp_by_name, s->repo);
8596 		if (err)
8597 			break;
8598 		got_reflist_object_id_map_free(tog_refs_idmap);
8599 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8600 		    &tog_refs, s->repo);
8601 		if (err)
8602 			break;
8603 		ref_view_free_refs(s);
8604 		err = ref_view_load_refs(s);
8605 		break;
8606 	case KEY_ENTER:
8607 	case '\r':
8608 		view->count = 0;
8609 		if (!s->selected_entry)
8610 			break;
8611 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8612 		break;
8613 	case 'T':
8614 		view->count = 0;
8615 		if (!s->selected_entry)
8616 			break;
8617 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8618 		break;
8619 	case 'g':
8620 	case '=':
8621 	case KEY_HOME:
8622 		s->selected = 0;
8623 		view->count = 0;
8624 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8625 		break;
8626 	case 'G':
8627 	case '*':
8628 	case KEY_END: {
8629 		int eos = view->nlines - 1;
8630 
8631 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8632 			--eos;  /* border */
8633 		s->selected = 0;
8634 		view->count = 0;
8635 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8636 		for (n = 0; n < eos; n++) {
8637 			if (re == NULL)
8638 				break;
8639 			s->first_displayed_entry = re;
8640 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8641 		}
8642 		if (n > 0)
8643 			s->selected = n - 1;
8644 		break;
8645 	}
8646 	case 'k':
8647 	case KEY_UP:
8648 	case CTRL('p'):
8649 		if (s->selected > 0) {
8650 			s->selected--;
8651 			break;
8652 		}
8653 		ref_scroll_up(s, 1);
8654 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8655 			view->count = 0;
8656 		break;
8657 	case CTRL('u'):
8658 	case 'u':
8659 		nscroll /= 2;
8660 		/* FALL THROUGH */
8661 	case KEY_PPAGE:
8662 	case CTRL('b'):
8663 	case 'b':
8664 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8665 			s->selected -= MIN(nscroll, s->selected);
8666 		ref_scroll_up(s, MAX(0, nscroll));
8667 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8668 			view->count = 0;
8669 		break;
8670 	case 'j':
8671 	case KEY_DOWN:
8672 	case CTRL('n'):
8673 		if (s->selected < s->ndisplayed - 1) {
8674 			s->selected++;
8675 			break;
8676 		}
8677 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8678 			/* can't scroll any further */
8679 			view->count = 0;
8680 			break;
8681 		}
8682 		ref_scroll_down(view, 1);
8683 		break;
8684 	case CTRL('d'):
8685 	case 'd':
8686 		nscroll /= 2;
8687 		/* FALL THROUGH */
8688 	case KEY_NPAGE:
8689 	case CTRL('f'):
8690 	case 'f':
8691 	case ' ':
8692 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8693 			/* can't scroll any further; move cursor down */
8694 			if (s->selected < s->ndisplayed - 1)
8695 				s->selected += MIN(nscroll,
8696 				    s->ndisplayed - s->selected - 1);
8697 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8698 				s->selected += s->ndisplayed - s->selected - 1;
8699 			view->count = 0;
8700 			break;
8701 		}
8702 		ref_scroll_down(view, nscroll);
8703 		break;
8704 	case CTRL('l'):
8705 		view->count = 0;
8706 		tog_free_refs();
8707 		err = tog_load_refs(s->repo, s->sort_by_date);
8708 		if (err)
8709 			break;
8710 		ref_view_free_refs(s);
8711 		err = ref_view_load_refs(s);
8712 		break;
8713 	case KEY_RESIZE:
8714 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8715 			s->selected = view->nlines - 2;
8716 		break;
8717 	default:
8718 		view->count = 0;
8719 		break;
8720 	}
8721 
8722 	return err;
8723 }
8724 
8725 __dead static void
8726 usage_ref(void)
8727 {
8728 	endwin();
8729 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8730 	    getprogname());
8731 	exit(1);
8732 }
8733 
8734 static const struct got_error *
8735 cmd_ref(int argc, char *argv[])
8736 {
8737 	const struct got_error *error;
8738 	struct got_repository *repo = NULL;
8739 	struct got_worktree *worktree = NULL;
8740 	char *cwd = NULL, *repo_path = NULL;
8741 	int ch;
8742 	struct tog_view *view;
8743 	int *pack_fds = NULL;
8744 
8745 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8746 		switch (ch) {
8747 		case 'r':
8748 			repo_path = realpath(optarg, NULL);
8749 			if (repo_path == NULL)
8750 				return got_error_from_errno2("realpath",
8751 				    optarg);
8752 			break;
8753 		default:
8754 			usage_ref();
8755 			/* NOTREACHED */
8756 		}
8757 	}
8758 
8759 	argc -= optind;
8760 	argv += optind;
8761 
8762 	if (argc > 1)
8763 		usage_ref();
8764 
8765 	error = got_repo_pack_fds_open(&pack_fds);
8766 	if (error != NULL)
8767 		goto done;
8768 
8769 	if (repo_path == NULL) {
8770 		cwd = getcwd(NULL, 0);
8771 		if (cwd == NULL)
8772 			return got_error_from_errno("getcwd");
8773 		error = got_worktree_open(&worktree, cwd);
8774 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8775 			goto done;
8776 		if (worktree)
8777 			repo_path =
8778 			    strdup(got_worktree_get_repo_path(worktree));
8779 		else
8780 			repo_path = strdup(cwd);
8781 		if (repo_path == NULL) {
8782 			error = got_error_from_errno("strdup");
8783 			goto done;
8784 		}
8785 	}
8786 
8787 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8788 	if (error != NULL)
8789 		goto done;
8790 
8791 	init_curses();
8792 
8793 	error = apply_unveil(got_repo_get_path(repo), NULL);
8794 	if (error)
8795 		goto done;
8796 
8797 	error = tog_load_refs(repo, 0);
8798 	if (error)
8799 		goto done;
8800 
8801 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8802 	if (view == NULL) {
8803 		error = got_error_from_errno("view_open");
8804 		goto done;
8805 	}
8806 
8807 	error = open_ref_view(view, repo);
8808 	if (error)
8809 		goto done;
8810 
8811 	if (worktree) {
8812 		/* Release work tree lock. */
8813 		got_worktree_close(worktree);
8814 		worktree = NULL;
8815 	}
8816 	error = view_loop(view);
8817 done:
8818 	free(repo_path);
8819 	free(cwd);
8820 	if (repo) {
8821 		const struct got_error *close_err = got_repo_close(repo);
8822 		if (close_err)
8823 			error = close_err;
8824 	}
8825 	if (pack_fds) {
8826 		const struct got_error *pack_err =
8827 		    got_repo_pack_fds_close(pack_fds);
8828 		if (error == NULL)
8829 			error = pack_err;
8830 	}
8831 	tog_free_refs();
8832 	return error;
8833 }
8834 
8835 static const struct got_error*
8836 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8837     const char *str)
8838 {
8839 	size_t len;
8840 
8841 	if (win == NULL)
8842 		win = stdscr;
8843 
8844 	len = strlen(str);
8845 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8846 
8847 	if (focus)
8848 		wstandout(win);
8849 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8850 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8851 	if (focus)
8852 		wstandend(win);
8853 
8854 	return NULL;
8855 }
8856 
8857 static const struct got_error *
8858 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8859 {
8860 	off_t *p;
8861 
8862 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8863 	if (p == NULL) {
8864 		free(*line_offsets);
8865 		*line_offsets = NULL;
8866 		return got_error_from_errno("reallocarray");
8867 	}
8868 
8869 	*line_offsets = p;
8870 	(*line_offsets)[*nlines] = off;
8871 	++(*nlines);
8872 	return NULL;
8873 }
8874 
8875 static const struct got_error *
8876 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8877 {
8878 	*ret = 0;
8879 
8880 	for (;n > 0; --n, ++km) {
8881 		char	*t0, *t, *k;
8882 		size_t	 len = 1;
8883 
8884 		if (km->keys == NULL)
8885 			continue;
8886 
8887 		t = t0 = strdup(km->keys);
8888 		if (t0 == NULL)
8889 			return got_error_from_errno("strdup");
8890 
8891 		len += strlen(t);
8892 		while ((k = strsep(&t, " ")) != NULL)
8893 			len += strlen(k) > 1 ? 2 : 0;
8894 		free(t0);
8895 		*ret = MAX(*ret, len);
8896 	}
8897 
8898 	return NULL;
8899 }
8900 
8901 /*
8902  * Write keymap section headers, keys, and key info in km to f.
8903  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8904  * wrap control and symbolic keys in guillemets, else use <>.
8905  */
8906 static const struct got_error *
8907 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8908 {
8909 	int n, len = width;
8910 
8911 	if (km->keys) {
8912 		static const char *u8_glyph[] = {
8913 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8914 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8915 		};
8916 		char	*t0, *t, *k;
8917 		int	 cs, s, first = 1;
8918 
8919 		cs = got_locale_is_utf8();
8920 
8921 		t = t0 = strdup(km->keys);
8922 		if (t0 == NULL)
8923 			return got_error_from_errno("strdup");
8924 
8925 		len = strlen(km->keys);
8926 		while ((k = strsep(&t, " ")) != NULL) {
8927 			s = strlen(k) > 1;  /* control or symbolic key */
8928 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8929 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8930 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8931 			if (n < 0) {
8932 				free(t0);
8933 				return got_error_from_errno("fprintf");
8934 			}
8935 			first = 0;
8936 			len += s ? 2 : 0;
8937 			*off += n;
8938 		}
8939 		free(t0);
8940 	}
8941 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8942 	if (n < 0)
8943 		return got_error_from_errno("fprintf");
8944 	*off += n;
8945 
8946 	return NULL;
8947 }
8948 
8949 static const struct got_error *
8950 format_help(struct tog_help_view_state *s)
8951 {
8952 	const struct got_error		*err = NULL;
8953 	off_t				 off = 0;
8954 	int				 i, max, n, show = s->all;
8955 	static const struct tog_key_map	 km[] = {
8956 #define KEYMAP_(info, type)	{ NULL, (info), type }
8957 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8958 		GENERATE_HELP
8959 #undef KEYMAP_
8960 #undef KEY_
8961 	};
8962 
8963 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8964 	if (err)
8965 		return err;
8966 
8967 	n = nitems(km);
8968 	err = max_key_str(&max, km, n);
8969 	if (err)
8970 		return err;
8971 
8972 	for (i = 0; i < n; ++i) {
8973 		if (km[i].keys == NULL) {
8974 			show = s->all;
8975 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8976 			    km[i].type == s->type || s->all)
8977 				show = 1;
8978 		}
8979 		if (show) {
8980 			err = format_help_line(&off, s->f, &km[i], max);
8981 			if (err)
8982 				return err;
8983 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8984 			if (err)
8985 				return err;
8986 		}
8987 	}
8988 	fputc('\n', s->f);
8989 	++off;
8990 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8991 	return err;
8992 }
8993 
8994 static const struct got_error *
8995 create_help(struct tog_help_view_state *s)
8996 {
8997 	FILE			*f;
8998 	const struct got_error	*err;
8999 
9000 	free(s->line_offsets);
9001 	s->line_offsets = NULL;
9002 	s->nlines = 0;
9003 
9004 	f = got_opentemp();
9005 	if (f == NULL)
9006 		return got_error_from_errno("got_opentemp");
9007 	s->f = f;
9008 
9009 	err = format_help(s);
9010 	if (err)
9011 		return err;
9012 
9013 	if (s->f && fflush(s->f) != 0)
9014 		return got_error_from_errno("fflush");
9015 
9016 	return NULL;
9017 }
9018 
9019 static const struct got_error *
9020 search_start_help_view(struct tog_view *view)
9021 {
9022 	view->state.help.matched_line = 0;
9023 	return NULL;
9024 }
9025 
9026 static void
9027 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9028     size_t *nlines, int **first, int **last, int **match, int **selected)
9029 {
9030 	struct tog_help_view_state *s = &view->state.help;
9031 
9032 	*f = s->f;
9033 	*nlines = s->nlines;
9034 	*line_offsets = s->line_offsets;
9035 	*match = &s->matched_line;
9036 	*first = &s->first_displayed_line;
9037 	*last = &s->last_displayed_line;
9038 	*selected = &s->selected_line;
9039 }
9040 
9041 static const struct got_error *
9042 show_help_view(struct tog_view *view)
9043 {
9044 	struct tog_help_view_state	*s = &view->state.help;
9045 	const struct got_error		*err;
9046 	regmatch_t			*regmatch = &view->regmatch;
9047 	wchar_t				*wline;
9048 	char				*line;
9049 	ssize_t				 linelen;
9050 	size_t				 linesz = 0;
9051 	int				 width, nprinted = 0, rc = 0;
9052 	int				 eos = view->nlines;
9053 
9054 	if (view_is_hsplit_top(view))
9055 		--eos;  /* account for border */
9056 
9057 	s->lineno = 0;
9058 	rewind(s->f);
9059 	werase(view->window);
9060 
9061 	if (view->gline > s->nlines - 1)
9062 		view->gline = s->nlines - 1;
9063 
9064 	err = win_draw_center(view->window, 0, 0, view->ncols,
9065 	    view_needs_focus_indication(view),
9066 	    "tog help (press q to return to tog)");
9067 	if (err)
9068 		return err;
9069 	if (eos <= 1)
9070 		return NULL;
9071 	waddstr(view->window, "\n\n");
9072 	eos -= 2;
9073 
9074 	s->eof = 0;
9075 	view->maxx = 0;
9076 	line = NULL;
9077 	while (eos > 0 && nprinted < eos) {
9078 		attr_t attr = 0;
9079 
9080 		linelen = getline(&line, &linesz, s->f);
9081 		if (linelen == -1) {
9082 			if (!feof(s->f)) {
9083 				free(line);
9084 				return got_ferror(s->f, GOT_ERR_IO);
9085 			}
9086 			s->eof = 1;
9087 			break;
9088 		}
9089 		if (++s->lineno < s->first_displayed_line)
9090 			continue;
9091 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9092 			continue;
9093 		if (s->lineno == view->hiline)
9094 			attr = A_STANDOUT;
9095 
9096 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9097 		    view->x ? 1 : 0);
9098 		if (err) {
9099 			free(line);
9100 			return err;
9101 		}
9102 		view->maxx = MAX(view->maxx, width);
9103 		free(wline);
9104 		wline = NULL;
9105 
9106 		if (attr)
9107 			wattron(view->window, attr);
9108 		if (s->first_displayed_line + nprinted == s->matched_line &&
9109 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9110 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9111 			    view->window, view->x, regmatch);
9112 			if (err) {
9113 				free(line);
9114 				return err;
9115 			}
9116 		} else {
9117 			int skip;
9118 
9119 			err = format_line(&wline, &width, &skip, line,
9120 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9121 			if (err) {
9122 				free(line);
9123 				return err;
9124 			}
9125 			waddwstr(view->window, &wline[skip]);
9126 			free(wline);
9127 			wline = NULL;
9128 		}
9129 		if (s->lineno == view->hiline) {
9130 			while (width++ < view->ncols)
9131 				waddch(view->window, ' ');
9132 		} else {
9133 			if (width < view->ncols)
9134 				waddch(view->window, '\n');
9135 		}
9136 		if (attr)
9137 			wattroff(view->window, attr);
9138 		if (++nprinted == 1)
9139 			s->first_displayed_line = s->lineno;
9140 	}
9141 	free(line);
9142 	if (nprinted > 0)
9143 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9144 	else
9145 		s->last_displayed_line = s->first_displayed_line;
9146 
9147 	view_border(view);
9148 
9149 	if (s->eof) {
9150 		rc = waddnstr(view->window,
9151 		    "See the tog(1) manual page for full documentation",
9152 		    view->ncols - 1);
9153 		if (rc == ERR)
9154 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9155 	} else {
9156 		wmove(view->window, view->nlines - 1, 0);
9157 		wclrtoeol(view->window);
9158 		wstandout(view->window);
9159 		rc = waddnstr(view->window, "scroll down for more...",
9160 		    view->ncols - 1);
9161 		if (rc == ERR)
9162 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9163 		if (getcurx(view->window) < view->ncols - 6) {
9164 			rc = wprintw(view->window, "[%.0f%%]",
9165 			    100.00 * s->last_displayed_line / s->nlines);
9166 			if (rc == ERR)
9167 				return got_error_msg(GOT_ERR_IO, "wprintw");
9168 		}
9169 		wstandend(view->window);
9170 	}
9171 
9172 	return NULL;
9173 }
9174 
9175 static const struct got_error *
9176 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9177 {
9178 	struct tog_help_view_state	*s = &view->state.help;
9179 	const struct got_error		*err = NULL;
9180 	char				*line = NULL;
9181 	ssize_t				 linelen;
9182 	size_t				 linesz = 0;
9183 	int				 eos, nscroll;
9184 
9185 	eos = nscroll = view->nlines;
9186 	if (view_is_hsplit_top(view))
9187 		--eos;  /* border */
9188 
9189 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9190 
9191 	switch (ch) {
9192 	case '0':
9193 	case '$':
9194 	case KEY_RIGHT:
9195 	case 'l':
9196 	case KEY_LEFT:
9197 	case 'h':
9198 		horizontal_scroll_input(view, ch);
9199 		break;
9200 	case 'g':
9201 	case KEY_HOME:
9202 		s->first_displayed_line = 1;
9203 		view->count = 0;
9204 		break;
9205 	case 'G':
9206 	case KEY_END:
9207 		view->count = 0;
9208 		if (s->eof)
9209 			break;
9210 		s->first_displayed_line = (s->nlines - eos) + 3;
9211 		s->eof = 1;
9212 		break;
9213 	case 'k':
9214 	case KEY_UP:
9215 		if (s->first_displayed_line > 1)
9216 			--s->first_displayed_line;
9217 		else
9218 			view->count = 0;
9219 		break;
9220 	case CTRL('u'):
9221 	case 'u':
9222 		nscroll /= 2;
9223 		/* FALL THROUGH */
9224 	case KEY_PPAGE:
9225 	case CTRL('b'):
9226 	case 'b':
9227 		if (s->first_displayed_line == 1) {
9228 			view->count = 0;
9229 			break;
9230 		}
9231 		while (--nscroll > 0 && s->first_displayed_line > 1)
9232 			s->first_displayed_line--;
9233 		break;
9234 	case 'j':
9235 	case KEY_DOWN:
9236 	case CTRL('n'):
9237 		if (!s->eof)
9238 			++s->first_displayed_line;
9239 		else
9240 			view->count = 0;
9241 		break;
9242 	case CTRL('d'):
9243 	case 'd':
9244 		nscroll /= 2;
9245 		/* FALL THROUGH */
9246 	case KEY_NPAGE:
9247 	case CTRL('f'):
9248 	case 'f':
9249 	case ' ':
9250 		if (s->eof) {
9251 			view->count = 0;
9252 			break;
9253 		}
9254 		while (!s->eof && --nscroll > 0) {
9255 			linelen = getline(&line, &linesz, s->f);
9256 			s->first_displayed_line++;
9257 			if (linelen == -1) {
9258 				if (feof(s->f))
9259 					s->eof = 1;
9260 				else
9261 					err = got_ferror(s->f, GOT_ERR_IO);
9262 				break;
9263 			}
9264 		}
9265 		free(line);
9266 		break;
9267 	default:
9268 		view->count = 0;
9269 		break;
9270 	}
9271 
9272 	return err;
9273 }
9274 
9275 static const struct got_error *
9276 close_help_view(struct tog_view *view)
9277 {
9278 	struct tog_help_view_state *s = &view->state.help;
9279 
9280 	free(s->line_offsets);
9281 	s->line_offsets = NULL;
9282 	if (fclose(s->f) == EOF)
9283 		return got_error_from_errno("fclose");
9284 
9285 	return NULL;
9286 }
9287 
9288 static const struct got_error *
9289 reset_help_view(struct tog_view *view)
9290 {
9291 	struct tog_help_view_state *s = &view->state.help;
9292 
9293 
9294 	if (s->f && fclose(s->f) == EOF)
9295 		return got_error_from_errno("fclose");
9296 
9297 	wclear(view->window);
9298 	view->count = 0;
9299 	view->x = 0;
9300 	s->all = !s->all;
9301 	s->first_displayed_line = 1;
9302 	s->last_displayed_line = view->nlines;
9303 	s->matched_line = 0;
9304 
9305 	return create_help(s);
9306 }
9307 
9308 static const struct got_error *
9309 open_help_view(struct tog_view *view, struct tog_view *parent)
9310 {
9311 	const struct got_error		*err = NULL;
9312 	struct tog_help_view_state	*s = &view->state.help;
9313 
9314 	s->type = (enum tog_keymap_type)parent->type;
9315 	s->first_displayed_line = 1;
9316 	s->last_displayed_line = view->nlines;
9317 	s->selected_line = 1;
9318 
9319 	view->show = show_help_view;
9320 	view->input = input_help_view;
9321 	view->reset = reset_help_view;
9322 	view->close = close_help_view;
9323 	view->search_start = search_start_help_view;
9324 	view->search_setup = search_setup_help_view;
9325 	view->search_next = search_next_view_match;
9326 
9327 	err = create_help(s);
9328 	return err;
9329 }
9330 
9331 static const struct got_error *
9332 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9333     enum tog_view_type request, int y, int x)
9334 {
9335 	const struct got_error *err = NULL;
9336 
9337 	*new_view = NULL;
9338 
9339 	switch (request) {
9340 	case TOG_VIEW_DIFF:
9341 		if (view->type == TOG_VIEW_LOG) {
9342 			struct tog_log_view_state *s = &view->state.log;
9343 
9344 			err = open_diff_view_for_commit(new_view, y, x,
9345 			    s->selected_entry->commit, s->selected_entry->id,
9346 			    view, s->repo);
9347 		} else
9348 			return got_error_msg(GOT_ERR_NOT_IMPL,
9349 			    "parent/child view pair not supported");
9350 		break;
9351 	case TOG_VIEW_BLAME:
9352 		if (view->type == TOG_VIEW_TREE) {
9353 			struct tog_tree_view_state *s = &view->state.tree;
9354 
9355 			err = blame_tree_entry(new_view, y, x,
9356 			    s->selected_entry, &s->parents, s->commit_id,
9357 			    s->repo);
9358 		} else
9359 			return got_error_msg(GOT_ERR_NOT_IMPL,
9360 			    "parent/child view pair not supported");
9361 		break;
9362 	case TOG_VIEW_LOG:
9363 		if (view->type == TOG_VIEW_BLAME)
9364 			err = log_annotated_line(new_view, y, x,
9365 			    view->state.blame.repo, view->state.blame.id_to_log);
9366 		else if (view->type == TOG_VIEW_TREE)
9367 			err = log_selected_tree_entry(new_view, y, x,
9368 			    &view->state.tree);
9369 		else if (view->type == TOG_VIEW_REF)
9370 			err = log_ref_entry(new_view, y, x,
9371 			    view->state.ref.selected_entry,
9372 			    view->state.ref.repo);
9373 		else
9374 			return got_error_msg(GOT_ERR_NOT_IMPL,
9375 			    "parent/child view pair not supported");
9376 		break;
9377 	case TOG_VIEW_TREE:
9378 		if (view->type == TOG_VIEW_LOG)
9379 			err = browse_commit_tree(new_view, y, x,
9380 			    view->state.log.selected_entry,
9381 			    view->state.log.in_repo_path,
9382 			    view->state.log.head_ref_name,
9383 			    view->state.log.repo);
9384 		else if (view->type == TOG_VIEW_REF)
9385 			err = browse_ref_tree(new_view, y, x,
9386 			    view->state.ref.selected_entry,
9387 			    view->state.ref.repo);
9388 		else
9389 			return got_error_msg(GOT_ERR_NOT_IMPL,
9390 			    "parent/child view pair not supported");
9391 		break;
9392 	case TOG_VIEW_REF:
9393 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9394 		if (*new_view == NULL)
9395 			return got_error_from_errno("view_open");
9396 		if (view->type == TOG_VIEW_LOG)
9397 			err = open_ref_view(*new_view, view->state.log.repo);
9398 		else if (view->type == TOG_VIEW_TREE)
9399 			err = open_ref_view(*new_view, view->state.tree.repo);
9400 		else
9401 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9402 			    "parent/child view pair not supported");
9403 		if (err)
9404 			view_close(*new_view);
9405 		break;
9406 	case TOG_VIEW_HELP:
9407 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9408 		if (*new_view == NULL)
9409 			return got_error_from_errno("view_open");
9410 		err = open_help_view(*new_view, view);
9411 		if (err)
9412 			view_close(*new_view);
9413 		break;
9414 	default:
9415 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9416 	}
9417 
9418 	return err;
9419 }
9420 
9421 /*
9422  * If view was scrolled down to move the selected line into view when opening a
9423  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9424  */
9425 static void
9426 offset_selection_up(struct tog_view *view)
9427 {
9428 	switch (view->type) {
9429 	case TOG_VIEW_BLAME: {
9430 		struct tog_blame_view_state *s = &view->state.blame;
9431 		if (s->first_displayed_line == 1) {
9432 			s->selected_line = MAX(s->selected_line - view->offset,
9433 			    1);
9434 			break;
9435 		}
9436 		if (s->first_displayed_line > view->offset)
9437 			s->first_displayed_line -= view->offset;
9438 		else
9439 			s->first_displayed_line = 1;
9440 		s->selected_line += view->offset;
9441 		break;
9442 	}
9443 	case TOG_VIEW_LOG:
9444 		log_scroll_up(&view->state.log, view->offset);
9445 		view->state.log.selected += view->offset;
9446 		break;
9447 	case TOG_VIEW_REF:
9448 		ref_scroll_up(&view->state.ref, view->offset);
9449 		view->state.ref.selected += view->offset;
9450 		break;
9451 	case TOG_VIEW_TREE:
9452 		tree_scroll_up(&view->state.tree, view->offset);
9453 		view->state.tree.selected += view->offset;
9454 		break;
9455 	default:
9456 		break;
9457 	}
9458 
9459 	view->offset = 0;
9460 }
9461 
9462 /*
9463  * If the selected line is in the section of screen covered by the bottom split,
9464  * scroll down offset lines to move it into view and index its new position.
9465  */
9466 static const struct got_error *
9467 offset_selection_down(struct tog_view *view)
9468 {
9469 	const struct got_error	*err = NULL;
9470 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9471 	int			*selected = NULL;
9472 	int			 header, offset;
9473 
9474 	switch (view->type) {
9475 	case TOG_VIEW_BLAME: {
9476 		struct tog_blame_view_state *s = &view->state.blame;
9477 		header = 3;
9478 		scrolld = NULL;
9479 		if (s->selected_line > view->nlines - header) {
9480 			offset = abs(view->nlines - s->selected_line - header);
9481 			s->first_displayed_line += offset;
9482 			s->selected_line -= offset;
9483 			view->offset = offset;
9484 		}
9485 		break;
9486 	}
9487 	case TOG_VIEW_LOG: {
9488 		struct tog_log_view_state *s = &view->state.log;
9489 		scrolld = &log_scroll_down;
9490 		header = view_is_parent_view(view) ? 3 : 2;
9491 		selected = &s->selected;
9492 		break;
9493 	}
9494 	case TOG_VIEW_REF: {
9495 		struct tog_ref_view_state *s = &view->state.ref;
9496 		scrolld = &ref_scroll_down;
9497 		header = 3;
9498 		selected = &s->selected;
9499 		break;
9500 	}
9501 	case TOG_VIEW_TREE: {
9502 		struct tog_tree_view_state *s = &view->state.tree;
9503 		scrolld = &tree_scroll_down;
9504 		header = 5;
9505 		selected = &s->selected;
9506 		break;
9507 	}
9508 	default:
9509 		selected = NULL;
9510 		scrolld = NULL;
9511 		header = 0;
9512 		break;
9513 	}
9514 
9515 	if (selected && *selected > view->nlines - header) {
9516 		offset = abs(view->nlines - *selected - header);
9517 		view->offset = offset;
9518 		if (scrolld && offset) {
9519 			err = scrolld(view, offset);
9520 			*selected -= offset;
9521 		}
9522 	}
9523 
9524 	return err;
9525 }
9526 
9527 static void
9528 list_commands(FILE *fp)
9529 {
9530 	size_t i;
9531 
9532 	fprintf(fp, "commands:");
9533 	for (i = 0; i < nitems(tog_commands); i++) {
9534 		const struct tog_cmd *cmd = &tog_commands[i];
9535 		fprintf(fp, " %s", cmd->name);
9536 	}
9537 	fputc('\n', fp);
9538 }
9539 
9540 __dead static void
9541 usage(int hflag, int status)
9542 {
9543 	FILE *fp = (status == 0) ? stdout : stderr;
9544 
9545 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9546 	    getprogname());
9547 	if (hflag) {
9548 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9549 		list_commands(fp);
9550 	}
9551 	exit(status);
9552 }
9553 
9554 static char **
9555 make_argv(int argc, ...)
9556 {
9557 	va_list ap;
9558 	char **argv;
9559 	int i;
9560 
9561 	va_start(ap, argc);
9562 
9563 	argv = calloc(argc, sizeof(char *));
9564 	if (argv == NULL)
9565 		err(1, "calloc");
9566 	for (i = 0; i < argc; i++) {
9567 		argv[i] = strdup(va_arg(ap, char *));
9568 		if (argv[i] == NULL)
9569 			err(1, "strdup");
9570 	}
9571 
9572 	va_end(ap);
9573 	return argv;
9574 }
9575 
9576 /*
9577  * Try to convert 'tog path' into a 'tog log path' command.
9578  * The user could simply have mistyped the command rather than knowingly
9579  * provided a path. So check whether argv[0] can in fact be resolved
9580  * to a path in the HEAD commit and print a special error if not.
9581  * This hack is for mpi@ <3
9582  */
9583 static const struct got_error *
9584 tog_log_with_path(int argc, char *argv[])
9585 {
9586 	const struct got_error *error = NULL, *close_err;
9587 	const struct tog_cmd *cmd = NULL;
9588 	struct got_repository *repo = NULL;
9589 	struct got_worktree *worktree = NULL;
9590 	struct got_object_id *commit_id = NULL, *id = NULL;
9591 	struct got_commit_object *commit = NULL;
9592 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9593 	char *commit_id_str = NULL, **cmd_argv = NULL;
9594 	int *pack_fds = NULL;
9595 
9596 	cwd = getcwd(NULL, 0);
9597 	if (cwd == NULL)
9598 		return got_error_from_errno("getcwd");
9599 
9600 	error = got_repo_pack_fds_open(&pack_fds);
9601 	if (error != NULL)
9602 		goto done;
9603 
9604 	error = got_worktree_open(&worktree, cwd);
9605 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9606 		goto done;
9607 
9608 	if (worktree)
9609 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9610 	else
9611 		repo_path = strdup(cwd);
9612 	if (repo_path == NULL) {
9613 		error = got_error_from_errno("strdup");
9614 		goto done;
9615 	}
9616 
9617 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9618 	if (error != NULL)
9619 		goto done;
9620 
9621 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9622 	    repo, worktree);
9623 	if (error)
9624 		goto done;
9625 
9626 	error = tog_load_refs(repo, 0);
9627 	if (error)
9628 		goto done;
9629 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9630 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9631 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9632 	if (error)
9633 		goto done;
9634 
9635 	if (worktree) {
9636 		got_worktree_close(worktree);
9637 		worktree = NULL;
9638 	}
9639 
9640 	error = got_object_open_as_commit(&commit, repo, commit_id);
9641 	if (error)
9642 		goto done;
9643 
9644 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9645 	if (error) {
9646 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9647 			goto done;
9648 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9649 		    getprogname(), argv[0]);
9650 		usage(1, 1);
9651 		/* not reached */
9652 	}
9653 
9654 	error = got_object_id_str(&commit_id_str, commit_id);
9655 	if (error)
9656 		goto done;
9657 
9658 	cmd = &tog_commands[0]; /* log */
9659 	argc = 4;
9660 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9661 	error = cmd->cmd_main(argc, cmd_argv);
9662 done:
9663 	if (repo) {
9664 		close_err = got_repo_close(repo);
9665 		if (error == NULL)
9666 			error = close_err;
9667 	}
9668 	if (commit)
9669 		got_object_commit_close(commit);
9670 	if (worktree)
9671 		got_worktree_close(worktree);
9672 	if (pack_fds) {
9673 		const struct got_error *pack_err =
9674 		    got_repo_pack_fds_close(pack_fds);
9675 		if (error == NULL)
9676 			error = pack_err;
9677 	}
9678 	free(id);
9679 	free(commit_id_str);
9680 	free(commit_id);
9681 	free(cwd);
9682 	free(repo_path);
9683 	free(in_repo_path);
9684 	if (cmd_argv) {
9685 		int i;
9686 		for (i = 0; i < argc; i++)
9687 			free(cmd_argv[i]);
9688 		free(cmd_argv);
9689 	}
9690 	tog_free_refs();
9691 	return error;
9692 }
9693 
9694 int
9695 main(int argc, char *argv[])
9696 {
9697 	const struct got_error *io_err, *error = NULL;
9698 	const struct tog_cmd *cmd = NULL;
9699 	int ch, hflag = 0, Vflag = 0;
9700 	char **cmd_argv = NULL;
9701 	static const struct option longopts[] = {
9702 	    { "version", no_argument, NULL, 'V' },
9703 	    { NULL, 0, NULL, 0}
9704 	};
9705 	char *diff_algo_str = NULL;
9706 	const char *test_script_path;
9707 
9708 	setlocale(LC_CTYPE, "");
9709 
9710 	/*
9711 	 * Test mode init must happen before pledge() because "tty" will
9712 	 * not allow TTY-related ioctls to occur via regular files.
9713 	 */
9714 	test_script_path = getenv("GOT_TOG_TEST");
9715 	if (test_script_path != NULL) {
9716 		error = init_mock_term(test_script_path);
9717 		if (error) {
9718 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9719 			return 1;
9720 		}
9721 	}
9722 
9723 #if !defined(PROFILE)
9724 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9725 	    NULL) == -1)
9726 		err(1, "pledge");
9727 #endif
9728 
9729 	if (!isatty(STDIN_FILENO))
9730 		errx(1, "standard input is not a tty");
9731 
9732 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9733 		switch (ch) {
9734 		case 'h':
9735 			hflag = 1;
9736 			break;
9737 		case 'V':
9738 			Vflag = 1;
9739 			break;
9740 		default:
9741 			usage(hflag, 1);
9742 			/* NOTREACHED */
9743 		}
9744 	}
9745 
9746 	argc -= optind;
9747 	argv += optind;
9748 	optind = 1;
9749 	optreset = 1;
9750 
9751 	if (Vflag) {
9752 		got_version_print_str();
9753 		return 0;
9754 	}
9755 
9756 	if (argc == 0) {
9757 		if (hflag)
9758 			usage(hflag, 0);
9759 		/* Build an argument vector which runs a default command. */
9760 		cmd = &tog_commands[0];
9761 		argc = 1;
9762 		cmd_argv = make_argv(argc, cmd->name);
9763 	} else {
9764 		size_t i;
9765 
9766 		/* Did the user specify a command? */
9767 		for (i = 0; i < nitems(tog_commands); i++) {
9768 			if (strncmp(tog_commands[i].name, argv[0],
9769 			    strlen(argv[0])) == 0) {
9770 				cmd = &tog_commands[i];
9771 				break;
9772 			}
9773 		}
9774 	}
9775 
9776 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9777 	if (diff_algo_str) {
9778 		if (strcasecmp(diff_algo_str, "patience") == 0)
9779 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9780 		if (strcasecmp(diff_algo_str, "myers") == 0)
9781 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9782 	}
9783 
9784 	if (cmd == NULL) {
9785 		if (argc != 1)
9786 			usage(0, 1);
9787 		/* No command specified; try log with a path */
9788 		error = tog_log_with_path(argc, argv);
9789 	} else {
9790 		if (hflag)
9791 			cmd->cmd_usage();
9792 		else
9793 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9794 	}
9795 
9796 	if (using_mock_io) {
9797 		io_err = tog_io_close();
9798 		if (error == NULL)
9799 			error = io_err;
9800 	}
9801 	endwin();
9802 	if (cmd_argv) {
9803 		int i;
9804 		for (i = 0; i < argc; i++)
9805 			free(cmd_argv[i]);
9806 		free(cmd_argv);
9807 	}
9808 
9809 	if (error && error->code != GOT_ERR_CANCELLED &&
9810 	    error->code != GOT_ERR_EOF &&
9811 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9812 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9813 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9814 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9815 	return 0;
9816 }