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