1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 
60 #ifndef MIN
61 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 #endif
63 
64 #ifndef MAX
65 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
66 #endif
67 
68 #define CTRL(x)		((x) & 0x1f)
69 
70 #ifndef nitems
71 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
72 #endif
73 
74 struct tog_cmd {
75 	const char *name;
76 	const struct got_error *(*cmd_main)(int, char *[]);
77 	void (*cmd_usage)(void);
78 };
79 
80 __dead static void	usage(int, int);
81 __dead static void	usage_log(void);
82 __dead static void	usage_diff(void);
83 __dead static void	usage_blame(void);
84 __dead static void	usage_tree(void);
85 __dead static void	usage_ref(void);
86 
87 static const struct got_error*	cmd_log(int, char *[]);
88 static const struct got_error*	cmd_diff(int, char *[]);
89 static const struct got_error*	cmd_blame(int, char *[]);
90 static const struct got_error*	cmd_tree(int, char *[]);
91 static const struct got_error*	cmd_ref(int, char *[]);
92 
93 static const struct tog_cmd tog_commands[] = {
94 	{ "log",	cmd_log,	usage_log },
95 	{ "diff",	cmd_diff,	usage_diff },
96 	{ "blame",	cmd_blame,	usage_blame },
97 	{ "tree",	cmd_tree,	usage_tree },
98 	{ "ref",	cmd_ref,	usage_ref },
99 };
100 
101 enum tog_view_type {
102 	TOG_VIEW_DIFF,
103 	TOG_VIEW_LOG,
104 	TOG_VIEW_BLAME,
105 	TOG_VIEW_TREE,
106 	TOG_VIEW_REF,
107 	TOG_VIEW_HELP
108 };
109 
110 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
111 enum tog_keymap_type {
112 	TOG_KEYMAP_KEYS = -2,
113 	TOG_KEYMAP_GLOBAL,
114 	TOG_KEYMAP_DIFF,
115 	TOG_KEYMAP_LOG,
116 	TOG_KEYMAP_BLAME,
117 	TOG_KEYMAP_TREE,
118 	TOG_KEYMAP_REF,
119 	TOG_KEYMAP_HELP
120 };
121 
122 enum tog_view_mode {
123 	TOG_VIEW_SPLIT_NONE,
124 	TOG_VIEW_SPLIT_VERT,
125 	TOG_VIEW_SPLIT_HRZN
126 };
127 
128 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
129 
130 #define TOG_EOF_STRING	"(END)"
131 
132 struct commit_queue_entry {
133 	TAILQ_ENTRY(commit_queue_entry) entry;
134 	struct got_object_id *id;
135 	struct got_commit_object *commit;
136 	int idx;
137 };
138 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
139 struct commit_queue {
140 	int ncommits;
141 	struct commit_queue_head head;
142 };
143 
144 struct tog_color {
145 	STAILQ_ENTRY(tog_color) entry;
146 	regex_t regex;
147 	short colorpair;
148 };
149 STAILQ_HEAD(tog_colors, tog_color);
150 
151 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
152 static struct got_reflist_object_id_map *tog_refs_idmap;
153 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
154 
155 static const struct got_error *
156 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
157     struct got_reference* re2)
158 {
159 	const char *name1 = got_ref_get_name(re1);
160 	const char *name2 = got_ref_get_name(re2);
161 	int isbackup1, isbackup2;
162 
163 	/* Sort backup refs towards the bottom of the list. */
164 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
165 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
166 	if (!isbackup1 && isbackup2) {
167 		*cmp = -1;
168 		return NULL;
169 	} else if (isbackup1 && !isbackup2) {
170 		*cmp = 1;
171 		return NULL;
172 	}
173 
174 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
175 	return NULL;
176 }
177 
178 static const struct got_error *
179 tog_load_refs(struct got_repository *repo, int sort_by_date)
180 {
181 	const struct got_error *err;
182 
183 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
184 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
185 	    repo);
186 	if (err)
187 		return err;
188 
189 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
190 	    repo);
191 }
192 
193 static void
194 tog_free_refs(void)
195 {
196 	if (tog_refs_idmap) {
197 		got_reflist_object_id_map_free(tog_refs_idmap);
198 		tog_refs_idmap = NULL;
199 	}
200 	got_ref_list_free(&tog_refs);
201 }
202 
203 static const struct got_error *
204 add_color(struct tog_colors *colors, const char *pattern,
205     int idx, short color)
206 {
207 	const struct got_error *err = NULL;
208 	struct tog_color *tc;
209 	int regerr = 0;
210 
211 	if (idx < 1 || idx > COLOR_PAIRS - 1)
212 		return NULL;
213 
214 	init_pair(idx, color, -1);
215 
216 	tc = calloc(1, sizeof(*tc));
217 	if (tc == NULL)
218 		return got_error_from_errno("calloc");
219 	regerr = regcomp(&tc->regex, pattern,
220 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
221 	if (regerr) {
222 		static char regerr_msg[512];
223 		static char err_msg[512];
224 		regerror(regerr, &tc->regex, regerr_msg,
225 		    sizeof(regerr_msg));
226 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
227 		    regerr_msg);
228 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
229 		free(tc);
230 		return err;
231 	}
232 	tc->colorpair = idx;
233 	STAILQ_INSERT_HEAD(colors, tc, entry);
234 	return NULL;
235 }
236 
237 static void
238 free_colors(struct tog_colors *colors)
239 {
240 	struct tog_color *tc;
241 
242 	while (!STAILQ_EMPTY(colors)) {
243 		tc = STAILQ_FIRST(colors);
244 		STAILQ_REMOVE_HEAD(colors, entry);
245 		regfree(&tc->regex);
246 		free(tc);
247 	}
248 }
249 
250 static struct tog_color *
251 get_color(struct tog_colors *colors, int colorpair)
252 {
253 	struct tog_color *tc = NULL;
254 
255 	STAILQ_FOREACH(tc, colors, entry) {
256 		if (tc->colorpair == colorpair)
257 			return tc;
258 	}
259 
260 	return NULL;
261 }
262 
263 static int
264 default_color_value(const char *envvar)
265 {
266 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
271 		return COLOR_YELLOW;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
275 		return COLOR_MAGENTA;
276 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
281 		return COLOR_GREEN;
282 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
287 		return COLOR_YELLOW;
288 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
291 		return COLOR_MAGENTA;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
295 		return COLOR_CYAN;
296 
297 	return -1;
298 }
299 
300 static int
301 get_color_value(const char *envvar)
302 {
303 	const char *val = getenv(envvar);
304 
305 	if (val == NULL)
306 		return default_color_value(envvar);
307 
308 	if (strcasecmp(val, "black") == 0)
309 		return COLOR_BLACK;
310 	if (strcasecmp(val, "red") == 0)
311 		return COLOR_RED;
312 	if (strcasecmp(val, "green") == 0)
313 		return COLOR_GREEN;
314 	if (strcasecmp(val, "yellow") == 0)
315 		return COLOR_YELLOW;
316 	if (strcasecmp(val, "blue") == 0)
317 		return COLOR_BLUE;
318 	if (strcasecmp(val, "magenta") == 0)
319 		return COLOR_MAGENTA;
320 	if (strcasecmp(val, "cyan") == 0)
321 		return COLOR_CYAN;
322 	if (strcasecmp(val, "white") == 0)
323 		return COLOR_WHITE;
324 	if (strcasecmp(val, "default") == 0)
325 		return -1;
326 
327 	return default_color_value(envvar);
328 }
329 
330 struct tog_diff_view_state {
331 	struct got_object_id *id1, *id2;
332 	const char *label1, *label2;
333 	FILE *f, *f1, *f2;
334 	int fd1, fd2;
335 	int lineno;
336 	int first_displayed_line;
337 	int last_displayed_line;
338 	int eof;
339 	int diff_context;
340 	int ignore_whitespace;
341 	int force_text_diff;
342 	struct got_repository *repo;
343 	struct got_diff_line *lines;
344 	size_t nlines;
345 	int matched_line;
346 	int selected_line;
347 
348 	/* passed from log or blame view; may be NULL */
349 	struct tog_view *parent_view;
350 };
351 
352 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
353 static volatile sig_atomic_t tog_thread_error;
354 
355 struct tog_log_thread_args {
356 	pthread_cond_t need_commits;
357 	pthread_cond_t commit_loaded;
358 	int commits_needed;
359 	int load_all;
360 	struct got_commit_graph *graph;
361 	struct commit_queue *real_commits;
362 	const char *in_repo_path;
363 	struct got_object_id *start_id;
364 	struct got_repository *repo;
365 	int *pack_fds;
366 	int log_complete;
367 	sig_atomic_t *quit;
368 	struct commit_queue_entry **first_displayed_entry;
369 	struct commit_queue_entry **selected_entry;
370 	int *searching;
371 	int *search_next_done;
372 	regex_t *regex;
373 	int *limiting;
374 	int limit_match;
375 	regex_t *limit_regex;
376 	struct commit_queue *limit_commits;
377 };
378 
379 struct tog_log_view_state {
380 	struct commit_queue *commits;
381 	struct commit_queue_entry *first_displayed_entry;
382 	struct commit_queue_entry *last_displayed_entry;
383 	struct commit_queue_entry *selected_entry;
384 	struct commit_queue real_commits;
385 	int selected;
386 	char *in_repo_path;
387 	char *head_ref_name;
388 	int log_branches;
389 	struct got_repository *repo;
390 	struct got_object_id *start_id;
391 	sig_atomic_t quit;
392 	pthread_t thread;
393 	struct tog_log_thread_args thread_args;
394 	struct commit_queue_entry *matched_entry;
395 	struct commit_queue_entry *search_entry;
396 	struct tog_colors colors;
397 	int use_committer;
398 	int limit_view;
399 	regex_t limit_regex;
400 	struct commit_queue limit_commits;
401 };
402 
403 #define TOG_COLOR_DIFF_MINUS		1
404 #define TOG_COLOR_DIFF_PLUS		2
405 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
406 #define TOG_COLOR_DIFF_META		4
407 #define TOG_COLOR_TREE_SUBMODULE	5
408 #define TOG_COLOR_TREE_SYMLINK		6
409 #define TOG_COLOR_TREE_DIRECTORY	7
410 #define TOG_COLOR_TREE_EXECUTABLE	8
411 #define TOG_COLOR_COMMIT		9
412 #define TOG_COLOR_AUTHOR		10
413 #define TOG_COLOR_DATE			11
414 #define TOG_COLOR_REFS_HEADS		12
415 #define TOG_COLOR_REFS_TAGS		13
416 #define TOG_COLOR_REFS_REMOTES		14
417 #define TOG_COLOR_REFS_BACKUP		15
418 
419 struct tog_blame_cb_args {
420 	struct tog_blame_line *lines; /* one per line */
421 	int nlines;
422 
423 	struct tog_view *view;
424 	struct got_object_id *commit_id;
425 	int *quit;
426 };
427 
428 struct tog_blame_thread_args {
429 	const char *path;
430 	struct got_repository *repo;
431 	struct tog_blame_cb_args *cb_args;
432 	int *complete;
433 	got_cancel_cb cancel_cb;
434 	void *cancel_arg;
435 	pthread_cond_t blame_complete;
436 };
437 
438 struct tog_blame {
439 	FILE *f;
440 	off_t filesize;
441 	struct tog_blame_line *lines;
442 	int nlines;
443 	off_t *line_offsets;
444 	pthread_t thread;
445 	struct tog_blame_thread_args thread_args;
446 	struct tog_blame_cb_args cb_args;
447 	const char *path;
448 	int *pack_fds;
449 };
450 
451 struct tog_blame_view_state {
452 	int first_displayed_line;
453 	int last_displayed_line;
454 	int selected_line;
455 	int last_diffed_line;
456 	int blame_complete;
457 	int eof;
458 	int done;
459 	struct got_object_id_queue blamed_commits;
460 	struct got_object_qid *blamed_commit;
461 	char *path;
462 	struct got_repository *repo;
463 	struct got_object_id *commit_id;
464 	struct got_object_id *id_to_log;
465 	struct tog_blame blame;
466 	int matched_line;
467 	struct tog_colors colors;
468 };
469 
470 struct tog_parent_tree {
471 	TAILQ_ENTRY(tog_parent_tree) entry;
472 	struct got_tree_object *tree;
473 	struct got_tree_entry *first_displayed_entry;
474 	struct got_tree_entry *selected_entry;
475 	int selected;
476 };
477 
478 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
479 
480 struct tog_tree_view_state {
481 	char *tree_label;
482 	struct got_object_id *commit_id;/* commit which this tree belongs to */
483 	struct got_tree_object *root;	/* the commit's root tree entry */
484 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
485 	struct got_tree_entry *first_displayed_entry;
486 	struct got_tree_entry *last_displayed_entry;
487 	struct got_tree_entry *selected_entry;
488 	int ndisplayed, selected, show_ids;
489 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
490 	char *head_ref_name;
491 	struct got_repository *repo;
492 	struct got_tree_entry *matched_entry;
493 	struct tog_colors colors;
494 };
495 
496 struct tog_reflist_entry {
497 	TAILQ_ENTRY(tog_reflist_entry) entry;
498 	struct got_reference *ref;
499 	int idx;
500 };
501 
502 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
503 
504 struct tog_ref_view_state {
505 	struct tog_reflist_head refs;
506 	struct tog_reflist_entry *first_displayed_entry;
507 	struct tog_reflist_entry *last_displayed_entry;
508 	struct tog_reflist_entry *selected_entry;
509 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
510 	struct got_repository *repo;
511 	struct tog_reflist_entry *matched_entry;
512 	struct tog_colors colors;
513 };
514 
515 struct tog_help_view_state {
516 	FILE			*f;
517 	off_t			*line_offsets;
518 	size_t			 nlines;
519 	int			 lineno;
520 	int			 first_displayed_line;
521 	int			 last_displayed_line;
522 	int			 eof;
523 	int			 matched_line;
524 	int			 selected_line;
525 	int			 all;
526 	enum tog_keymap_type	 type;
527 };
528 
529 #define GENERATE_HELP \
530 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
531 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
532 	KEY_("k C-p Up", "Move cursor or page up one line"), \
533 	KEY_("j C-n Down", "Move cursor or page down one line"), \
534 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
535 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
536 	KEY_("C-u u", "Scroll the view up one half page"), \
537 	KEY_("C-d d", "Scroll the view down one half page"), \
538 	KEY_("g", "Go to line N (default: first line)"), \
539 	KEY_("Home =", "Go to the first line"), \
540 	KEY_("G", "Go to line N (default: last line)"), \
541 	KEY_("End *", "Go to the last line"), \
542 	KEY_("l Right", "Scroll the view right"), \
543 	KEY_("h Left", "Scroll the view left"), \
544 	KEY_("$", "Scroll view to the rightmost position"), \
545 	KEY_("0", "Scroll view to the leftmost position"), \
546 	KEY_("-", "Decrease size of the focussed split"), \
547 	KEY_("+", "Increase size of the focussed split"), \
548 	KEY_("Tab", "Switch focus between views"), \
549 	KEY_("F", "Toggle fullscreen mode"), \
550 	KEY_("S", "Switch split-screen layout"), \
551 	KEY_("/", "Open prompt to enter search term"), \
552 	KEY_("n", "Find next line/token matching the current search term"), \
553 	KEY_("N", "Find previous line/token matching the current search term"),\
554 	KEY_("q", "Quit the focussed view; Quit help screen"), \
555 	KEY_("Q", "Quit tog"), \
556 	\
557 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
558 	KEY_("< ,", "Move cursor up one commit"), \
559 	KEY_("> .", "Move cursor down one commit"), \
560 	KEY_("Enter", "Open diff view of the selected commit"), \
561 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
562 	KEY_("R", "Open ref view of all repository references"), \
563 	KEY_("T", "Display tree view of the repository from the selected" \
564 	    " commit"), \
565 	KEY_("@", "Toggle between displaying author and committer name"), \
566 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
567 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
568 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
569 	\
570 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
571 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
572 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
573 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
574 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
575 	    " data"), \
576 	KEY_("(", "Go to the previous file in the diff"), \
577 	KEY_(")", "Go to the next file in the diff"), \
578 	KEY_("{", "Go to the previous hunk in the diff"), \
579 	KEY_("}", "Go to the next hunk in the diff"), \
580 	KEY_("[", "Decrease the number of context lines"), \
581 	KEY_("]", "Increase the number of context lines"), \
582 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
583 	\
584 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
585 	KEY_("Enter", "Display diff view of the selected line's commit"), \
586 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
587 	KEY_("L", "Open log view for the currently selected annotated line"), \
588 	KEY_("C", "Reload view with the previously blamed commit"), \
589 	KEY_("c", "Reload view with the version of the file found in the" \
590 	    " selected line's commit"), \
591 	KEY_("p", "Reload view with the version of the file found in the" \
592 	    " selected line's parent commit"), \
593 	\
594 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
595 	KEY_("Enter", "Enter selected directory or open blame view of the" \
596 	    " selected file"), \
597 	KEY_("L", "Open log view for the selected entry"), \
598 	KEY_("R", "Open ref view of all repository references"), \
599 	KEY_("i", "Show object IDs for all tree entries"), \
600 	KEY_("Backspace", "Return to the parent directory"), \
601 	\
602 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
603 	KEY_("Enter", "Display log view of the selected reference"), \
604 	KEY_("T", "Display tree view of the selected reference"), \
605 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
606 	KEY_("m", "Toggle display of last modified date for each reference"), \
607 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
608 	KEY_("C-l", "Reload view with all repository references")
609 
610 struct tog_key_map {
611 	const char		*keys;
612 	const char		*info;
613 	enum tog_keymap_type	 type;
614 };
615 
616 /* curses io for tog regress */
617 struct tog_io {
618 	FILE	*cin;
619 	FILE	*cout;
620 	FILE	*f;
621 	FILE	*sdump;
622 	int	 wait_for_ui;
623 } tog_io;
624 static int using_mock_io;
625 
626 #define TOG_KEY_SCRDUMP	SHRT_MIN
627 
628 /*
629  * We implement two types of views: parent views and child views.
630  *
631  * The 'Tab' key switches focus between a parent view and its child view.
632  * Child views are shown side-by-side to their parent view, provided
633  * there is enough screen estate.
634  *
635  * When a new view is opened from within a parent view, this new view
636  * becomes a child view of the parent view, replacing any existing child.
637  *
638  * When a new view is opened from within a child view, this new view
639  * becomes a parent view which will obscure the views below until the
640  * user quits the new parent view by typing 'q'.
641  *
642  * This list of views contains parent views only.
643  * Child views are only pointed to by their parent view.
644  */
645 TAILQ_HEAD(tog_view_list_head, tog_view);
646 
647 struct tog_view {
648 	TAILQ_ENTRY(tog_view) entry;
649 	WINDOW *window;
650 	PANEL *panel;
651 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
652 	int resized_y, resized_x; /* begin_y/x based on user resizing */
653 	int maxx, x; /* max column and current start column */
654 	int lines, cols; /* copies of LINES and COLS */
655 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
656 	int gline, hiline; /* navigate to and highlight this nG line */
657 	int ch, count; /* current keymap and count prefix */
658 	int resized; /* set when in a resize event */
659 	int focussed; /* Only set on one parent or child view at a time. */
660 	int dying;
661 	struct tog_view *parent;
662 	struct tog_view *child;
663 
664 	/*
665 	 * This flag is initially set on parent views when a new child view
666 	 * is created. It gets toggled when the 'Tab' key switches focus
667 	 * between parent and child.
668 	 * The flag indicates whether focus should be passed on to our child
669 	 * view if this parent view gets picked for focus after another parent
670 	 * view was closed. This prevents child views from losing focus in such
671 	 * situations.
672 	 */
673 	int focus_child;
674 
675 	enum tog_view_mode mode;
676 	/* type-specific state */
677 	enum tog_view_type type;
678 	union {
679 		struct tog_diff_view_state diff;
680 		struct tog_log_view_state log;
681 		struct tog_blame_view_state blame;
682 		struct tog_tree_view_state tree;
683 		struct tog_ref_view_state ref;
684 		struct tog_help_view_state help;
685 	} state;
686 
687 	const struct got_error *(*show)(struct tog_view *);
688 	const struct got_error *(*input)(struct tog_view **,
689 	    struct tog_view *, int);
690 	const struct got_error *(*reset)(struct tog_view *);
691 	const struct got_error *(*resize)(struct tog_view *, int);
692 	const struct got_error *(*close)(struct tog_view *);
693 
694 	const struct got_error *(*search_start)(struct tog_view *);
695 	const struct got_error *(*search_next)(struct tog_view *);
696 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
697 	    int **, int **, int **, int **);
698 	int search_started;
699 	int searching;
700 #define TOG_SEARCH_FORWARD	1
701 #define TOG_SEARCH_BACKWARD	2
702 	int search_next_done;
703 #define TOG_SEARCH_HAVE_MORE	1
704 #define TOG_SEARCH_NO_MORE	2
705 #define TOG_SEARCH_HAVE_NONE	3
706 	regex_t regex;
707 	regmatch_t regmatch;
708 	const char *action;
709 };
710 
711 static const struct got_error *open_diff_view(struct tog_view *,
712     struct got_object_id *, struct got_object_id *,
713     const char *, const char *, int, int, int, struct tog_view *,
714     struct got_repository *);
715 static const struct got_error *show_diff_view(struct tog_view *);
716 static const struct got_error *input_diff_view(struct tog_view **,
717     struct tog_view *, int);
718 static const struct got_error *reset_diff_view(struct tog_view *);
719 static const struct got_error* close_diff_view(struct tog_view *);
720 static const struct got_error *search_start_diff_view(struct tog_view *);
721 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
722     size_t *, int **, int **, int **, int **);
723 static const struct got_error *search_next_view_match(struct tog_view *);
724 
725 static const struct got_error *open_log_view(struct tog_view *,
726     struct got_object_id *, struct got_repository *,
727     const char *, const char *, int);
728 static const struct got_error * show_log_view(struct tog_view *);
729 static const struct got_error *input_log_view(struct tog_view **,
730     struct tog_view *, int);
731 static const struct got_error *resize_log_view(struct tog_view *, int);
732 static const struct got_error *close_log_view(struct tog_view *);
733 static const struct got_error *search_start_log_view(struct tog_view *);
734 static const struct got_error *search_next_log_view(struct tog_view *);
735 
736 static const struct got_error *open_blame_view(struct tog_view *, char *,
737     struct got_object_id *, struct got_repository *);
738 static const struct got_error *show_blame_view(struct tog_view *);
739 static const struct got_error *input_blame_view(struct tog_view **,
740     struct tog_view *, int);
741 static const struct got_error *reset_blame_view(struct tog_view *);
742 static const struct got_error *close_blame_view(struct tog_view *);
743 static const struct got_error *search_start_blame_view(struct tog_view *);
744 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
745     size_t *, int **, int **, int **, int **);
746 
747 static const struct got_error *open_tree_view(struct tog_view *,
748     struct got_object_id *, const char *, struct got_repository *);
749 static const struct got_error *show_tree_view(struct tog_view *);
750 static const struct got_error *input_tree_view(struct tog_view **,
751     struct tog_view *, int);
752 static const struct got_error *close_tree_view(struct tog_view *);
753 static const struct got_error *search_start_tree_view(struct tog_view *);
754 static const struct got_error *search_next_tree_view(struct tog_view *);
755 
756 static const struct got_error *open_ref_view(struct tog_view *,
757     struct got_repository *);
758 static const struct got_error *show_ref_view(struct tog_view *);
759 static const struct got_error *input_ref_view(struct tog_view **,
760     struct tog_view *, int);
761 static const struct got_error *close_ref_view(struct tog_view *);
762 static const struct got_error *search_start_ref_view(struct tog_view *);
763 static const struct got_error *search_next_ref_view(struct tog_view *);
764 
765 static const struct got_error *open_help_view(struct tog_view *,
766     struct tog_view *);
767 static const struct got_error *show_help_view(struct tog_view *);
768 static const struct got_error *input_help_view(struct tog_view **,
769     struct tog_view *, int);
770 static const struct got_error *reset_help_view(struct tog_view *);
771 static const struct got_error* close_help_view(struct tog_view *);
772 static const struct got_error *search_start_help_view(struct tog_view *);
773 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
774     size_t *, int **, int **, int **, int **);
775 
776 static volatile sig_atomic_t tog_sigwinch_received;
777 static volatile sig_atomic_t tog_sigpipe_received;
778 static volatile sig_atomic_t tog_sigcont_received;
779 static volatile sig_atomic_t tog_sigint_received;
780 static volatile sig_atomic_t tog_sigterm_received;
781 
782 static void
783 tog_sigwinch(int signo)
784 {
785 	tog_sigwinch_received = 1;
786 }
787 
788 static void
789 tog_sigpipe(int signo)
790 {
791 	tog_sigpipe_received = 1;
792 }
793 
794 static void
795 tog_sigcont(int signo)
796 {
797 	tog_sigcont_received = 1;
798 }
799 
800 static void
801 tog_sigint(int signo)
802 {
803 	tog_sigint_received = 1;
804 }
805 
806 static void
807 tog_sigterm(int signo)
808 {
809 	tog_sigterm_received = 1;
810 }
811 
812 static int
813 tog_fatal_signal_received(void)
814 {
815 	return (tog_sigpipe_received ||
816 	    tog_sigint_received || tog_sigterm_received);
817 }
818 
819 static const struct got_error *
820 view_close(struct tog_view *view)
821 {
822 	const struct got_error *err = NULL, *child_err = NULL;
823 
824 	if (view->child) {
825 		child_err = view_close(view->child);
826 		view->child = NULL;
827 	}
828 	if (view->close)
829 		err = view->close(view);
830 	if (view->panel)
831 		del_panel(view->panel);
832 	if (view->window)
833 		delwin(view->window);
834 	free(view);
835 	return err ? err : child_err;
836 }
837 
838 static struct tog_view *
839 view_open(int nlines, int ncols, int begin_y, int begin_x,
840     enum tog_view_type type)
841 {
842 	struct tog_view *view = calloc(1, sizeof(*view));
843 
844 	if (view == NULL)
845 		return NULL;
846 
847 	view->type = type;
848 	view->lines = LINES;
849 	view->cols = COLS;
850 	view->nlines = nlines ? nlines : LINES - begin_y;
851 	view->ncols = ncols ? ncols : COLS - begin_x;
852 	view->begin_y = begin_y;
853 	view->begin_x = begin_x;
854 	view->window = newwin(nlines, ncols, begin_y, begin_x);
855 	if (view->window == NULL) {
856 		view_close(view);
857 		return NULL;
858 	}
859 	view->panel = new_panel(view->window);
860 	if (view->panel == NULL ||
861 	    set_panel_userptr(view->panel, view) != OK) {
862 		view_close(view);
863 		return NULL;
864 	}
865 
866 	keypad(view->window, TRUE);
867 	return view;
868 }
869 
870 static int
871 view_split_begin_x(int begin_x)
872 {
873 	if (begin_x > 0 || COLS < 120)
874 		return 0;
875 	return (COLS - MAX(COLS / 2, 80));
876 }
877 
878 /* XXX Stub till we decide what to do. */
879 static int
880 view_split_begin_y(int lines)
881 {
882 	return lines * HSPLIT_SCALE;
883 }
884 
885 static const struct got_error *view_resize(struct tog_view *);
886 
887 static const struct got_error *
888 view_splitscreen(struct tog_view *view)
889 {
890 	const struct got_error *err = NULL;
891 
892 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
893 		if (view->resized_y && view->resized_y < view->lines)
894 			view->begin_y = view->resized_y;
895 		else
896 			view->begin_y = view_split_begin_y(view->nlines);
897 		view->begin_x = 0;
898 	} else if (!view->resized) {
899 		if (view->resized_x && view->resized_x < view->cols - 1 &&
900 		    view->cols > 119)
901 			view->begin_x = view->resized_x;
902 		else
903 			view->begin_x = view_split_begin_x(0);
904 		view->begin_y = 0;
905 	}
906 	view->nlines = LINES - view->begin_y;
907 	view->ncols = COLS - view->begin_x;
908 	view->lines = LINES;
909 	view->cols = COLS;
910 	err = view_resize(view);
911 	if (err)
912 		return err;
913 
914 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
915 		view->parent->nlines = view->begin_y;
916 
917 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
918 		return got_error_from_errno("mvwin");
919 
920 	return NULL;
921 }
922 
923 static const struct got_error *
924 view_fullscreen(struct tog_view *view)
925 {
926 	const struct got_error *err = NULL;
927 
928 	view->begin_x = 0;
929 	view->begin_y = view->resized ? view->begin_y : 0;
930 	view->nlines = view->resized ? view->nlines : LINES;
931 	view->ncols = COLS;
932 	view->lines = LINES;
933 	view->cols = COLS;
934 	err = view_resize(view);
935 	if (err)
936 		return err;
937 
938 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
939 		return got_error_from_errno("mvwin");
940 
941 	return NULL;
942 }
943 
944 static int
945 view_is_parent_view(struct tog_view *view)
946 {
947 	return view->parent == NULL;
948 }
949 
950 static int
951 view_is_splitscreen(struct tog_view *view)
952 {
953 	return view->begin_x > 0 || view->begin_y > 0;
954 }
955 
956 static int
957 view_is_fullscreen(struct tog_view *view)
958 {
959 	return view->nlines == LINES && view->ncols == COLS;
960 }
961 
962 static int
963 view_is_hsplit_top(struct tog_view *view)
964 {
965 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
966 	    view_is_splitscreen(view->child);
967 }
968 
969 static void
970 view_border(struct tog_view *view)
971 {
972 	PANEL *panel;
973 	const struct tog_view *view_above;
974 
975 	if (view->parent)
976 		return view_border(view->parent);
977 
978 	panel = panel_above(view->panel);
979 	if (panel == NULL)
980 		return;
981 
982 	view_above = panel_userptr(panel);
983 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
984 		mvwhline(view->window, view_above->begin_y - 1,
985 		    view->begin_x, ACS_HLINE, view->ncols);
986 	else
987 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
988 		    ACS_VLINE, view->nlines);
989 }
990 
991 static const struct got_error *view_init_hsplit(struct tog_view *, int);
992 static const struct got_error *request_log_commits(struct tog_view *);
993 static const struct got_error *offset_selection_down(struct tog_view *);
994 static void offset_selection_up(struct tog_view *);
995 static void view_get_split(struct tog_view *, int *, int *);
996 
997 static const struct got_error *
998 view_resize(struct tog_view *view)
999 {
1000 	const struct got_error	*err = NULL;
1001 	int			 dif, nlines, ncols;
1002 
1003 	dif = LINES - view->lines;  /* line difference */
1004 
1005 	if (view->lines > LINES)
1006 		nlines = view->nlines - (view->lines - LINES);
1007 	else
1008 		nlines = view->nlines + (LINES - view->lines);
1009 	if (view->cols > COLS)
1010 		ncols = view->ncols - (view->cols - COLS);
1011 	else
1012 		ncols = view->ncols + (COLS - view->cols);
1013 
1014 	if (view->child) {
1015 		int hs = view->child->begin_y;
1016 
1017 		if (!view_is_fullscreen(view))
1018 			view->child->begin_x = view_split_begin_x(view->begin_x);
1019 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1020 		    view->child->begin_x == 0) {
1021 			ncols = COLS;
1022 
1023 			view_fullscreen(view->child);
1024 			if (view->child->focussed)
1025 				show_panel(view->child->panel);
1026 			else
1027 				show_panel(view->panel);
1028 		} else {
1029 			ncols = view->child->begin_x;
1030 
1031 			view_splitscreen(view->child);
1032 			show_panel(view->child->panel);
1033 		}
1034 		/*
1035 		 * XXX This is ugly and needs to be moved into the above
1036 		 * logic but "works" for now and my attempts at moving it
1037 		 * break either 'tab' or 'F' key maps in horizontal splits.
1038 		 */
1039 		if (hs) {
1040 			err = view_splitscreen(view->child);
1041 			if (err)
1042 				return err;
1043 			if (dif < 0) { /* top split decreased */
1044 				err = offset_selection_down(view);
1045 				if (err)
1046 					return err;
1047 			}
1048 			view_border(view);
1049 			update_panels();
1050 			doupdate();
1051 			show_panel(view->child->panel);
1052 			nlines = view->nlines;
1053 		}
1054 	} else if (view->parent == NULL)
1055 		ncols = COLS;
1056 
1057 	if (view->resize && dif > 0) {
1058 		err = view->resize(view, dif);
1059 		if (err)
1060 			return err;
1061 	}
1062 
1063 	if (wresize(view->window, nlines, ncols) == ERR)
1064 		return got_error_from_errno("wresize");
1065 	if (replace_panel(view->panel, view->window) == ERR)
1066 		return got_error_from_errno("replace_panel");
1067 	wclear(view->window);
1068 
1069 	view->nlines = nlines;
1070 	view->ncols = ncols;
1071 	view->lines = LINES;
1072 	view->cols = COLS;
1073 
1074 	return NULL;
1075 }
1076 
1077 static const struct got_error *
1078 resize_log_view(struct tog_view *view, int increase)
1079 {
1080 	struct tog_log_view_state	*s = &view->state.log;
1081 	const struct got_error		*err = NULL;
1082 	int				 n = 0;
1083 
1084 	if (s->selected_entry)
1085 		n = s->selected_entry->idx + view->lines - s->selected;
1086 
1087 	/*
1088 	 * Request commits to account for the increased
1089 	 * height so we have enough to populate the view.
1090 	 */
1091 	if (s->commits->ncommits < n) {
1092 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1093 		err = request_log_commits(view);
1094 	}
1095 
1096 	return err;
1097 }
1098 
1099 static void
1100 view_adjust_offset(struct tog_view *view, int n)
1101 {
1102 	if (n == 0)
1103 		return;
1104 
1105 	if (view->parent && view->parent->offset) {
1106 		if (view->parent->offset + n >= 0)
1107 			view->parent->offset += n;
1108 		else
1109 			view->parent->offset = 0;
1110 	} else if (view->offset) {
1111 		if (view->offset - n >= 0)
1112 			view->offset -= n;
1113 		else
1114 			view->offset = 0;
1115 	}
1116 }
1117 
1118 static const struct got_error *
1119 view_resize_split(struct tog_view *view, int resize)
1120 {
1121 	const struct got_error	*err = NULL;
1122 	struct tog_view		*v = NULL;
1123 
1124 	if (view->parent)
1125 		v = view->parent;
1126 	else
1127 		v = view;
1128 
1129 	if (!v->child || !view_is_splitscreen(v->child))
1130 		return NULL;
1131 
1132 	v->resized = v->child->resized = resize;  /* lock for resize event */
1133 
1134 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1135 		if (v->child->resized_y)
1136 			v->child->begin_y = v->child->resized_y;
1137 		if (view->parent)
1138 			v->child->begin_y -= resize;
1139 		else
1140 			v->child->begin_y += resize;
1141 		if (v->child->begin_y < 3) {
1142 			view->count = 0;
1143 			v->child->begin_y = 3;
1144 		} else if (v->child->begin_y > LINES - 1) {
1145 			view->count = 0;
1146 			v->child->begin_y = LINES - 1;
1147 		}
1148 		v->ncols = COLS;
1149 		v->child->ncols = COLS;
1150 		view_adjust_offset(view, resize);
1151 		err = view_init_hsplit(v, v->child->begin_y);
1152 		if (err)
1153 			return err;
1154 		v->child->resized_y = v->child->begin_y;
1155 	} else {
1156 		if (v->child->resized_x)
1157 			v->child->begin_x = v->child->resized_x;
1158 		if (view->parent)
1159 			v->child->begin_x -= resize;
1160 		else
1161 			v->child->begin_x += resize;
1162 		if (v->child->begin_x < 11) {
1163 			view->count = 0;
1164 			v->child->begin_x = 11;
1165 		} else if (v->child->begin_x > COLS - 1) {
1166 			view->count = 0;
1167 			v->child->begin_x = COLS - 1;
1168 		}
1169 		v->child->resized_x = v->child->begin_x;
1170 	}
1171 
1172 	v->child->mode = v->mode;
1173 	v->child->nlines = v->lines - v->child->begin_y;
1174 	v->child->ncols = v->cols - v->child->begin_x;
1175 	v->focus_child = 1;
1176 
1177 	err = view_fullscreen(v);
1178 	if (err)
1179 		return err;
1180 	err = view_splitscreen(v->child);
1181 	if (err)
1182 		return err;
1183 
1184 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1185 		err = offset_selection_down(v->child);
1186 		if (err)
1187 			return err;
1188 	}
1189 
1190 	if (v->resize)
1191 		err = v->resize(v, 0);
1192 	else if (v->child->resize)
1193 		err = v->child->resize(v->child, 0);
1194 
1195 	v->resized = v->child->resized = 0;
1196 
1197 	return err;
1198 }
1199 
1200 static void
1201 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1202 {
1203 	struct tog_view *v = src->child ? src->child : src;
1204 
1205 	dst->resized_x = v->resized_x;
1206 	dst->resized_y = v->resized_y;
1207 }
1208 
1209 static const struct got_error *
1210 view_close_child(struct tog_view *view)
1211 {
1212 	const struct got_error *err = NULL;
1213 
1214 	if (view->child == NULL)
1215 		return NULL;
1216 
1217 	err = view_close(view->child);
1218 	view->child = NULL;
1219 	return err;
1220 }
1221 
1222 static const struct got_error *
1223 view_set_child(struct tog_view *view, struct tog_view *child)
1224 {
1225 	const struct got_error *err = NULL;
1226 
1227 	view->child = child;
1228 	child->parent = view;
1229 
1230 	err = view_resize(view);
1231 	if (err)
1232 		return err;
1233 
1234 	if (view->child->resized_x || view->child->resized_y)
1235 		err = view_resize_split(view, 0);
1236 
1237 	return err;
1238 }
1239 
1240 static const struct got_error *view_dispatch_request(struct tog_view **,
1241     struct tog_view *, enum tog_view_type, int, int);
1242 
1243 static const struct got_error *
1244 view_request_new(struct tog_view **requested, struct tog_view *view,
1245     enum tog_view_type request)
1246 {
1247 	struct tog_view		*new_view = NULL;
1248 	const struct got_error	*err;
1249 	int			 y = 0, x = 0;
1250 
1251 	*requested = NULL;
1252 
1253 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1254 		view_get_split(view, &y, &x);
1255 
1256 	err = view_dispatch_request(&new_view, view, request, y, x);
1257 	if (err)
1258 		return err;
1259 
1260 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1261 	    request != TOG_VIEW_HELP) {
1262 		err = view_init_hsplit(view, y);
1263 		if (err)
1264 			return err;
1265 	}
1266 
1267 	view->focussed = 0;
1268 	new_view->focussed = 1;
1269 	new_view->mode = view->mode;
1270 	new_view->nlines = request == TOG_VIEW_HELP ?
1271 	    view->lines : view->lines - y;
1272 
1273 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1274 		view_transfer_size(new_view, view);
1275 		err = view_close_child(view);
1276 		if (err)
1277 			return err;
1278 		err = view_set_child(view, new_view);
1279 		if (err)
1280 			return err;
1281 		view->focus_child = 1;
1282 	} else
1283 		*requested = new_view;
1284 
1285 	return NULL;
1286 }
1287 
1288 static void
1289 tog_resizeterm(void)
1290 {
1291 	int cols, lines;
1292 	struct winsize size;
1293 
1294 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1295 		cols = 80;     /* Default */
1296 		lines = 24;
1297 	} else {
1298 		cols = size.ws_col;
1299 		lines = size.ws_row;
1300 	}
1301 	resize_term(lines, cols);
1302 }
1303 
1304 static const struct got_error *
1305 view_search_start(struct tog_view *view, int fast_refresh)
1306 {
1307 	const struct got_error *err = NULL;
1308 	struct tog_view *v = view;
1309 	char pattern[1024];
1310 	int ret;
1311 
1312 	if (view->search_started) {
1313 		regfree(&view->regex);
1314 		view->searching = 0;
1315 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1316 	}
1317 	view->search_started = 0;
1318 
1319 	if (view->nlines < 1)
1320 		return NULL;
1321 
1322 	if (view_is_hsplit_top(view))
1323 		v = view->child;
1324 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1325 		v = view->parent;
1326 
1327 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1328 	wclrtoeol(v->window);
1329 
1330 	nodelay(v->window, FALSE);  /* block for search term input */
1331 	nocbreak();
1332 	echo();
1333 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1334 	wrefresh(v->window);
1335 	cbreak();
1336 	noecho();
1337 	nodelay(v->window, TRUE);
1338 	if (!fast_refresh && !using_mock_io)
1339 		halfdelay(10);
1340 	if (ret == ERR)
1341 		return NULL;
1342 
1343 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1344 		err = view->search_start(view);
1345 		if (err) {
1346 			regfree(&view->regex);
1347 			return err;
1348 		}
1349 		view->search_started = 1;
1350 		view->searching = TOG_SEARCH_FORWARD;
1351 		view->search_next_done = 0;
1352 		view->search_next(view);
1353 	}
1354 
1355 	return NULL;
1356 }
1357 
1358 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1359 static const struct got_error *
1360 switch_split(struct tog_view *view)
1361 {
1362 	const struct got_error	*err = NULL;
1363 	struct tog_view		*v = NULL;
1364 
1365 	if (view->parent)
1366 		v = view->parent;
1367 	else
1368 		v = view;
1369 
1370 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1371 		v->mode = TOG_VIEW_SPLIT_VERT;
1372 	else
1373 		v->mode = TOG_VIEW_SPLIT_HRZN;
1374 
1375 	if (!v->child)
1376 		return NULL;
1377 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1378 		v->mode = TOG_VIEW_SPLIT_NONE;
1379 
1380 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1381 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1382 		v->child->begin_y = v->child->resized_y;
1383 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1384 		v->child->begin_x = v->child->resized_x;
1385 
1386 
1387 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1388 		v->ncols = COLS;
1389 		v->child->ncols = COLS;
1390 		v->child->nscrolled = LINES - v->child->nlines;
1391 
1392 		err = view_init_hsplit(v, v->child->begin_y);
1393 		if (err)
1394 			return err;
1395 	}
1396 	v->child->mode = v->mode;
1397 	v->child->nlines = v->lines - v->child->begin_y;
1398 	v->focus_child = 1;
1399 
1400 	err = view_fullscreen(v);
1401 	if (err)
1402 		return err;
1403 	err = view_splitscreen(v->child);
1404 	if (err)
1405 		return err;
1406 
1407 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1408 		v->mode = TOG_VIEW_SPLIT_VERT;
1409 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1410 		err = offset_selection_down(v);
1411 		if (err)
1412 			return err;
1413 		err = offset_selection_down(v->child);
1414 		if (err)
1415 			return err;
1416 	} else {
1417 		offset_selection_up(v);
1418 		offset_selection_up(v->child);
1419 	}
1420 	if (v->resize)
1421 		err = v->resize(v, 0);
1422 	else if (v->child->resize)
1423 		err = v->child->resize(v->child, 0);
1424 
1425 	return err;
1426 }
1427 
1428 /*
1429  * Strip trailing whitespace from str starting at byte *n;
1430  * if *n < 0, use strlen(str). Return new str length in *n.
1431  */
1432 static void
1433 strip_trailing_ws(char *str, int *n)
1434 {
1435 	size_t x = *n;
1436 
1437 	if (str == NULL || *str == '\0')
1438 		return;
1439 
1440 	if (x < 0)
1441 		x = strlen(str);
1442 
1443 	while (x-- > 0 && isspace((unsigned char)str[x]))
1444 		str[x] = '\0';
1445 
1446 	*n = x + 1;
1447 }
1448 
1449 /*
1450  * Extract visible substring of line y from the curses screen
1451  * and strip trailing whitespace. If vline is set, overwrite
1452  * line[vline] with '|' because the ACS_VLINE character is
1453  * written out as 'x'. Write the line to file f.
1454  */
1455 static const struct got_error *
1456 view_write_line(FILE *f, int y, int vline)
1457 {
1458 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1459 	int	r, w;
1460 
1461 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1462 	if (r == ERR)
1463 		return got_error_fmt(GOT_ERR_RANGE,
1464 		    "failed to extract line %d", y);
1465 
1466 	/*
1467 	 * In some views, lines are padded with blanks to COLS width.
1468 	 * Strip them so we can diff without the -b flag when testing.
1469 	 */
1470 	strip_trailing_ws(line, &r);
1471 
1472 	if (vline > 0)
1473 		line[vline] = '|';
1474 
1475 	w = fprintf(f, "%s\n", line);
1476 	if (w != r + 1)		/* \n */
1477 		return got_ferror(f, GOT_ERR_IO);
1478 
1479 	return NULL;
1480 }
1481 
1482 /*
1483  * Capture the visible curses screen by writing each line to the
1484  * file at the path set via the TOG_SCR_DUMP environment variable.
1485  */
1486 static const struct got_error *
1487 screendump(struct tog_view *view)
1488 {
1489 	const struct got_error	*err;
1490 	int			 i;
1491 
1492 	err = got_opentemp_truncate(tog_io.sdump);
1493 	if (err)
1494 		return err;
1495 
1496 	if ((view->child && view->child->begin_x) ||
1497 	    (view->parent && view->begin_x)) {
1498 		int ncols = view->child ? view->ncols : view->parent->ncols;
1499 
1500 		/* vertical splitscreen */
1501 		for (i = 0; i < view->nlines; ++i) {
1502 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1503 			if (err)
1504 				goto done;
1505 		}
1506 	} else {
1507 		int hline = 0;
1508 
1509 		/* fullscreen or horizontal splitscreen */
1510 		if ((view->child && view->child->begin_y) ||
1511 		    (view->parent && view->begin_y))	/* hsplit */
1512 			hline = view->child ?
1513 			    view->child->begin_y : view->begin_y;
1514 
1515 		for (i = 0; i < view->lines; i++) {
1516 			if (hline && i == hline - 1) {
1517 				int c;
1518 
1519 				/* ACS_HLINE writes out as 'q', overwrite it */
1520 				for (c = 0; c < view->cols; ++c)
1521 					fputc('-', tog_io.sdump);
1522 				fputc('\n', tog_io.sdump);
1523 				continue;
1524 			}
1525 
1526 			err = view_write_line(tog_io.sdump, i, 0);
1527 			if (err)
1528 				goto done;
1529 		}
1530 	}
1531 
1532 done:
1533 	return err;
1534 }
1535 
1536 /*
1537  * Compute view->count from numeric input. Assign total to view->count and
1538  * return first non-numeric key entered.
1539  */
1540 static int
1541 get_compound_key(struct tog_view *view, int c)
1542 {
1543 	struct tog_view	*v = view;
1544 	int		 x, n = 0;
1545 
1546 	if (view_is_hsplit_top(view))
1547 		v = view->child;
1548 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1549 		v = view->parent;
1550 
1551 	view->count = 0;
1552 	cbreak();  /* block for input */
1553 	nodelay(view->window, FALSE);
1554 	wmove(v->window, v->nlines - 1, 0);
1555 	wclrtoeol(v->window);
1556 	waddch(v->window, ':');
1557 
1558 	do {
1559 		x = getcurx(v->window);
1560 		if (x != ERR && x < view->ncols) {
1561 			waddch(v->window, c);
1562 			wrefresh(v->window);
1563 		}
1564 
1565 		/*
1566 		 * Don't overflow. Max valid request should be the greatest
1567 		 * between the longest and total lines; cap at 10 million.
1568 		 */
1569 		if (n >= 9999999)
1570 			n = 9999999;
1571 		else
1572 			n = n * 10 + (c - '0');
1573 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1574 
1575 	if (c == 'G' || c == 'g') {	/* nG key map */
1576 		view->gline = view->hiline = n;
1577 		n = 0;
1578 		c = 0;
1579 	}
1580 
1581 	/* Massage excessive or inapplicable values at the input handler. */
1582 	view->count = n;
1583 
1584 	return c;
1585 }
1586 
1587 static void
1588 action_report(struct tog_view *view)
1589 {
1590 	struct tog_view *v = view;
1591 
1592 	if (view_is_hsplit_top(view))
1593 		v = view->child;
1594 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1595 		v = view->parent;
1596 
1597 	wmove(v->window, v->nlines - 1, 0);
1598 	wclrtoeol(v->window);
1599 	wprintw(v->window, ":%s", view->action);
1600 	wrefresh(v->window);
1601 
1602 	/*
1603 	 * Clear action status report. Only clear in blame view
1604 	 * once annotating is complete, otherwise it's too fast.
1605 	 */
1606 	if (view->type == TOG_VIEW_BLAME) {
1607 		if (view->state.blame.blame_complete)
1608 			view->action = NULL;
1609 	} else
1610 		view->action = NULL;
1611 }
1612 
1613 /*
1614  * Read the next line from the test script and assign
1615  * key instruction to *ch. If at EOF, set the *done flag.
1616  */
1617 static const struct got_error *
1618 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1619 {
1620 	const struct got_error	*err = NULL;
1621 	char			*line = NULL;
1622 	size_t			 linesz = 0;
1623 
1624 	if (view->count && --view->count) {
1625 		*ch = view->ch;
1626 		return NULL;
1627 	} else
1628 		*ch = -1;
1629 
1630 	if (getline(&line, &linesz, script) == -1) {
1631 		if (feof(script)) {
1632 			*done = 1;
1633 			goto done;
1634 		} else {
1635 			err = got_ferror(script, GOT_ERR_IO);
1636 			goto done;
1637 		}
1638 	}
1639 
1640 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1641 		tog_io.wait_for_ui = 1;
1642 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1643 		*ch = KEY_ENTER;
1644 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1645 		*ch = KEY_RIGHT;
1646 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1647 		*ch = KEY_LEFT;
1648 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1649 		*ch = KEY_DOWN;
1650 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1651 		*ch = KEY_UP;
1652 	else if (strncasecmp(line, "TAB", 3) == 0)
1653 		*ch = '\t';
1654 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1655 		*ch = TOG_KEY_SCRDUMP;
1656 	else if (isdigit((unsigned char)*line)) {
1657 		char *t = line;
1658 
1659 		while (isdigit((unsigned char)*t))
1660 			++t;
1661 		view->ch = *ch = *t;
1662 		*t = '\0';
1663 		/* ignore error, view->count is 0 if instruction is invalid */
1664 		view->count = strtonum(line, 0, INT_MAX, NULL);
1665 	} else
1666 		*ch = *line;
1667 
1668 done:
1669 	free(line);
1670 	return err;
1671 }
1672 
1673 static const struct got_error *
1674 view_input(struct tog_view **new, int *done, struct tog_view *view,
1675     struct tog_view_list_head *views, int fast_refresh)
1676 {
1677 	const struct got_error *err = NULL;
1678 	struct tog_view *v;
1679 	int ch, errcode;
1680 
1681 	*new = NULL;
1682 
1683 	if (view->action)
1684 		action_report(view);
1685 
1686 	/* Clear "no matches" indicator. */
1687 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1688 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1689 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1690 		view->count = 0;
1691 	}
1692 
1693 	if (view->searching && !view->search_next_done) {
1694 		errcode = pthread_mutex_unlock(&tog_mutex);
1695 		if (errcode)
1696 			return got_error_set_errno(errcode,
1697 			    "pthread_mutex_unlock");
1698 		sched_yield();
1699 		errcode = pthread_mutex_lock(&tog_mutex);
1700 		if (errcode)
1701 			return got_error_set_errno(errcode,
1702 			    "pthread_mutex_lock");
1703 		view->search_next(view);
1704 		return NULL;
1705 	}
1706 
1707 	/* Allow threads to make progress while we are waiting for input. */
1708 	errcode = pthread_mutex_unlock(&tog_mutex);
1709 	if (errcode)
1710 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1711 
1712 	if (using_mock_io) {
1713 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1714 		if (err) {
1715 			errcode = pthread_mutex_lock(&tog_mutex);
1716 			return err;
1717 		}
1718 	} else if (view->count && --view->count) {
1719 		cbreak();
1720 		nodelay(view->window, TRUE);
1721 		ch = wgetch(view->window);
1722 		/* let C-g or backspace abort unfinished count */
1723 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1724 			view->count = 0;
1725 		else
1726 			ch = view->ch;
1727 	} else {
1728 		ch = wgetch(view->window);
1729 		if (ch >= '1' && ch  <= '9')
1730 			view->ch = ch = get_compound_key(view, ch);
1731 	}
1732 	if (view->hiline && ch != ERR && ch != 0)
1733 		view->hiline = 0;  /* key pressed, clear line highlight */
1734 	nodelay(view->window, TRUE);
1735 	errcode = pthread_mutex_lock(&tog_mutex);
1736 	if (errcode)
1737 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1738 
1739 	if (tog_sigwinch_received || tog_sigcont_received) {
1740 		tog_resizeterm();
1741 		tog_sigwinch_received = 0;
1742 		tog_sigcont_received = 0;
1743 		TAILQ_FOREACH(v, views, entry) {
1744 			err = view_resize(v);
1745 			if (err)
1746 				return err;
1747 			err = v->input(new, v, KEY_RESIZE);
1748 			if (err)
1749 				return err;
1750 			if (v->child) {
1751 				err = view_resize(v->child);
1752 				if (err)
1753 					return err;
1754 				err = v->child->input(new, v->child,
1755 				    KEY_RESIZE);
1756 				if (err)
1757 					return err;
1758 				if (v->child->resized_x || v->child->resized_y) {
1759 					err = view_resize_split(v, 0);
1760 					if (err)
1761 						return err;
1762 				}
1763 			}
1764 		}
1765 	}
1766 
1767 	switch (ch) {
1768 	case '?':
1769 	case 'H':
1770 	case KEY_F(1):
1771 		if (view->type == TOG_VIEW_HELP)
1772 			err = view->reset(view);
1773 		else
1774 			err = view_request_new(new, view, TOG_VIEW_HELP);
1775 		break;
1776 	case '\t':
1777 		view->count = 0;
1778 		if (view->child) {
1779 			view->focussed = 0;
1780 			view->child->focussed = 1;
1781 			view->focus_child = 1;
1782 		} else if (view->parent) {
1783 			view->focussed = 0;
1784 			view->parent->focussed = 1;
1785 			view->parent->focus_child = 0;
1786 			if (!view_is_splitscreen(view)) {
1787 				if (view->parent->resize) {
1788 					err = view->parent->resize(view->parent,
1789 					    0);
1790 					if (err)
1791 						return err;
1792 				}
1793 				offset_selection_up(view->parent);
1794 				err = view_fullscreen(view->parent);
1795 				if (err)
1796 					return err;
1797 			}
1798 		}
1799 		break;
1800 	case 'q':
1801 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1802 			if (view->parent->resize) {
1803 				/* might need more commits to fill fullscreen */
1804 				err = view->parent->resize(view->parent, 0);
1805 				if (err)
1806 					break;
1807 			}
1808 			offset_selection_up(view->parent);
1809 		}
1810 		err = view->input(new, view, ch);
1811 		view->dying = 1;
1812 		break;
1813 	case 'Q':
1814 		*done = 1;
1815 		break;
1816 	case 'F':
1817 		view->count = 0;
1818 		if (view_is_parent_view(view)) {
1819 			if (view->child == NULL)
1820 				break;
1821 			if (view_is_splitscreen(view->child)) {
1822 				view->focussed = 0;
1823 				view->child->focussed = 1;
1824 				err = view_fullscreen(view->child);
1825 			} else {
1826 				err = view_splitscreen(view->child);
1827 				if (!err)
1828 					err = view_resize_split(view, 0);
1829 			}
1830 			if (err)
1831 				break;
1832 			err = view->child->input(new, view->child,
1833 			    KEY_RESIZE);
1834 		} else {
1835 			if (view_is_splitscreen(view)) {
1836 				view->parent->focussed = 0;
1837 				view->focussed = 1;
1838 				err = view_fullscreen(view);
1839 			} else {
1840 				err = view_splitscreen(view);
1841 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1842 					err = view_resize(view->parent);
1843 				if (!err)
1844 					err = view_resize_split(view, 0);
1845 			}
1846 			if (err)
1847 				break;
1848 			err = view->input(new, view, KEY_RESIZE);
1849 		}
1850 		if (err)
1851 			break;
1852 		if (view->resize) {
1853 			err = view->resize(view, 0);
1854 			if (err)
1855 				break;
1856 		}
1857 		if (view->parent) {
1858 			if (view->parent->resize) {
1859 				err = view->parent->resize(view->parent, 0);
1860 				if (err != NULL)
1861 					break;
1862 			}
1863 			err = offset_selection_down(view->parent);
1864 			if (err != NULL)
1865 				break;
1866 		}
1867 		err = offset_selection_down(view);
1868 		break;
1869 	case 'S':
1870 		view->count = 0;
1871 		err = switch_split(view);
1872 		break;
1873 	case '-':
1874 		err = view_resize_split(view, -1);
1875 		break;
1876 	case '+':
1877 		err = view_resize_split(view, 1);
1878 		break;
1879 	case KEY_RESIZE:
1880 		break;
1881 	case '/':
1882 		view->count = 0;
1883 		if (view->search_start)
1884 			view_search_start(view, fast_refresh);
1885 		else
1886 			err = view->input(new, view, ch);
1887 		break;
1888 	case 'N':
1889 	case 'n':
1890 		if (view->search_started && view->search_next) {
1891 			view->searching = (ch == 'n' ?
1892 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1893 			view->search_next_done = 0;
1894 			view->search_next(view);
1895 		} else
1896 			err = view->input(new, view, ch);
1897 		break;
1898 	case 'A':
1899 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1900 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1901 			view->action = "Patience diff algorithm";
1902 		} else {
1903 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1904 			view->action = "Myers diff algorithm";
1905 		}
1906 		TAILQ_FOREACH(v, views, entry) {
1907 			if (v->reset) {
1908 				err = v->reset(v);
1909 				if (err)
1910 					return err;
1911 			}
1912 			if (v->child && v->child->reset) {
1913 				err = v->child->reset(v->child);
1914 				if (err)
1915 					return err;
1916 			}
1917 		}
1918 		break;
1919 	case TOG_KEY_SCRDUMP:
1920 		err = screendump(view);
1921 		break;
1922 	default:
1923 		err = view->input(new, view, ch);
1924 		break;
1925 	}
1926 
1927 	return err;
1928 }
1929 
1930 static int
1931 view_needs_focus_indication(struct tog_view *view)
1932 {
1933 	if (view_is_parent_view(view)) {
1934 		if (view->child == NULL || view->child->focussed)
1935 			return 0;
1936 		if (!view_is_splitscreen(view->child))
1937 			return 0;
1938 	} else if (!view_is_splitscreen(view))
1939 		return 0;
1940 
1941 	return view->focussed;
1942 }
1943 
1944 static const struct got_error *
1945 tog_io_close(void)
1946 {
1947 	const struct got_error *err = NULL;
1948 
1949 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1950 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1951 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1952 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1953 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1954 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1955 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1956 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1957 
1958 	return err;
1959 }
1960 
1961 static const struct got_error *
1962 view_loop(struct tog_view *view)
1963 {
1964 	const struct got_error *err = NULL;
1965 	struct tog_view_list_head views;
1966 	struct tog_view *new_view;
1967 	char *mode;
1968 	int fast_refresh = 10;
1969 	int done = 0, errcode;
1970 
1971 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1972 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1973 		view->mode = TOG_VIEW_SPLIT_VERT;
1974 	else
1975 		view->mode = TOG_VIEW_SPLIT_HRZN;
1976 
1977 	errcode = pthread_mutex_lock(&tog_mutex);
1978 	if (errcode)
1979 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1980 
1981 	TAILQ_INIT(&views);
1982 	TAILQ_INSERT_HEAD(&views, view, entry);
1983 
1984 	view->focussed = 1;
1985 	err = view->show(view);
1986 	if (err)
1987 		return err;
1988 	update_panels();
1989 	doupdate();
1990 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1991 	    !tog_fatal_signal_received()) {
1992 		/* Refresh fast during initialization, then become slower. */
1993 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1994 			halfdelay(10); /* switch to once per second */
1995 
1996 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1997 		if (err)
1998 			break;
1999 
2000 		if (view->dying && view == TAILQ_FIRST(&views) &&
2001 		    TAILQ_NEXT(view, entry) == NULL)
2002 			done = 1;
2003 		if (done) {
2004 			struct tog_view *v;
2005 
2006 			/*
2007 			 * When we quit, scroll the screen up a single line
2008 			 * so we don't lose any information.
2009 			 */
2010 			TAILQ_FOREACH(v, &views, entry) {
2011 				wmove(v->window, 0, 0);
2012 				wdeleteln(v->window);
2013 				wnoutrefresh(v->window);
2014 				if (v->child && !view_is_fullscreen(v)) {
2015 					wmove(v->child->window, 0, 0);
2016 					wdeleteln(v->child->window);
2017 					wnoutrefresh(v->child->window);
2018 				}
2019 			}
2020 			doupdate();
2021 		}
2022 
2023 		if (view->dying) {
2024 			struct tog_view *v, *prev = NULL;
2025 
2026 			if (view_is_parent_view(view))
2027 				prev = TAILQ_PREV(view, tog_view_list_head,
2028 				    entry);
2029 			else if (view->parent)
2030 				prev = view->parent;
2031 
2032 			if (view->parent) {
2033 				view->parent->child = NULL;
2034 				view->parent->focus_child = 0;
2035 				/* Restore fullscreen line height. */
2036 				view->parent->nlines = view->parent->lines;
2037 				err = view_resize(view->parent);
2038 				if (err)
2039 					break;
2040 				/* Make resized splits persist. */
2041 				view_transfer_size(view->parent, view);
2042 			} else
2043 				TAILQ_REMOVE(&views, view, entry);
2044 
2045 			err = view_close(view);
2046 			if (err)
2047 				goto done;
2048 
2049 			view = NULL;
2050 			TAILQ_FOREACH(v, &views, entry) {
2051 				if (v->focussed)
2052 					break;
2053 			}
2054 			if (view == NULL && new_view == NULL) {
2055 				/* No view has focus. Try to pick one. */
2056 				if (prev)
2057 					view = prev;
2058 				else if (!TAILQ_EMPTY(&views)) {
2059 					view = TAILQ_LAST(&views,
2060 					    tog_view_list_head);
2061 				}
2062 				if (view) {
2063 					if (view->focus_child) {
2064 						view->child->focussed = 1;
2065 						view = view->child;
2066 					} else
2067 						view->focussed = 1;
2068 				}
2069 			}
2070 		}
2071 		if (new_view) {
2072 			struct tog_view *v, *t;
2073 			/* Only allow one parent view per type. */
2074 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2075 				if (v->type != new_view->type)
2076 					continue;
2077 				TAILQ_REMOVE(&views, v, entry);
2078 				err = view_close(v);
2079 				if (err)
2080 					goto done;
2081 				break;
2082 			}
2083 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2084 			view = new_view;
2085 		}
2086 		if (view && !done) {
2087 			if (view_is_parent_view(view)) {
2088 				if (view->child && view->child->focussed)
2089 					view = view->child;
2090 			} else {
2091 				if (view->parent && view->parent->focussed)
2092 					view = view->parent;
2093 			}
2094 			show_panel(view->panel);
2095 			if (view->child && view_is_splitscreen(view->child))
2096 				show_panel(view->child->panel);
2097 			if (view->parent && view_is_splitscreen(view)) {
2098 				err = view->parent->show(view->parent);
2099 				if (err)
2100 					goto done;
2101 			}
2102 			err = view->show(view);
2103 			if (err)
2104 				goto done;
2105 			if (view->child) {
2106 				err = view->child->show(view->child);
2107 				if (err)
2108 					goto done;
2109 			}
2110 			update_panels();
2111 			doupdate();
2112 		}
2113 	}
2114 done:
2115 	while (!TAILQ_EMPTY(&views)) {
2116 		const struct got_error *close_err;
2117 		view = TAILQ_FIRST(&views);
2118 		TAILQ_REMOVE(&views, view, entry);
2119 		close_err = view_close(view);
2120 		if (close_err && err == NULL)
2121 			err = close_err;
2122 	}
2123 
2124 	errcode = pthread_mutex_unlock(&tog_mutex);
2125 	if (errcode && err == NULL)
2126 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2127 
2128 	return err;
2129 }
2130 
2131 __dead static void
2132 usage_log(void)
2133 {
2134 	endwin();
2135 	fprintf(stderr,
2136 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2137 	    getprogname());
2138 	exit(1);
2139 }
2140 
2141 /* Create newly allocated wide-character string equivalent to a byte string. */
2142 static const struct got_error *
2143 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2144 {
2145 	char *vis = NULL;
2146 	const struct got_error *err = NULL;
2147 
2148 	*ws = NULL;
2149 	*wlen = mbstowcs(NULL, s, 0);
2150 	if (*wlen == (size_t)-1) {
2151 		int vislen;
2152 		if (errno != EILSEQ)
2153 			return got_error_from_errno("mbstowcs");
2154 
2155 		/* byte string invalid in current encoding; try to "fix" it */
2156 		err = got_mbsavis(&vis, &vislen, s);
2157 		if (err)
2158 			return err;
2159 		*wlen = mbstowcs(NULL, vis, 0);
2160 		if (*wlen == (size_t)-1) {
2161 			err = got_error_from_errno("mbstowcs"); /* give up */
2162 			goto done;
2163 		}
2164 	}
2165 
2166 	*ws = calloc(*wlen + 1, sizeof(**ws));
2167 	if (*ws == NULL) {
2168 		err = got_error_from_errno("calloc");
2169 		goto done;
2170 	}
2171 
2172 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2173 		err = got_error_from_errno("mbstowcs");
2174 done:
2175 	free(vis);
2176 	if (err) {
2177 		free(*ws);
2178 		*ws = NULL;
2179 		*wlen = 0;
2180 	}
2181 	return err;
2182 }
2183 
2184 static const struct got_error *
2185 expand_tab(char **ptr, const char *src)
2186 {
2187 	char	*dst;
2188 	size_t	 len, n, idx = 0, sz = 0;
2189 
2190 	*ptr = NULL;
2191 	n = len = strlen(src);
2192 	dst = malloc(n + 1);
2193 	if (dst == NULL)
2194 		return got_error_from_errno("malloc");
2195 
2196 	while (idx < len && src[idx]) {
2197 		const char c = src[idx];
2198 
2199 		if (c == '\t') {
2200 			size_t nb = TABSIZE - sz % TABSIZE;
2201 			char *p;
2202 
2203 			p = realloc(dst, n + nb);
2204 			if (p == NULL) {
2205 				free(dst);
2206 				return got_error_from_errno("realloc");
2207 
2208 			}
2209 			dst = p;
2210 			n += nb;
2211 			memset(dst + sz, ' ', nb);
2212 			sz += nb;
2213 		} else
2214 			dst[sz++] = src[idx];
2215 		++idx;
2216 	}
2217 
2218 	dst[sz] = '\0';
2219 	*ptr = dst;
2220 	return NULL;
2221 }
2222 
2223 /*
2224  * Advance at most n columns from wline starting at offset off.
2225  * Return the index to the first character after the span operation.
2226  * Return the combined column width of all spanned wide character in
2227  * *rcol.
2228  */
2229 static int
2230 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2231 {
2232 	int width, i, cols = 0;
2233 
2234 	if (n == 0) {
2235 		*rcol = cols;
2236 		return off;
2237 	}
2238 
2239 	for (i = off; wline[i] != L'\0'; ++i) {
2240 		if (wline[i] == L'\t')
2241 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2242 		else
2243 			width = wcwidth(wline[i]);
2244 
2245 		if (width == -1) {
2246 			width = 1;
2247 			wline[i] = L'.';
2248 		}
2249 
2250 		if (cols + width > n)
2251 			break;
2252 		cols += width;
2253 	}
2254 
2255 	*rcol = cols;
2256 	return i;
2257 }
2258 
2259 /*
2260  * Format a line for display, ensuring that it won't overflow a width limit.
2261  * With scrolling, the width returned refers to the scrolled version of the
2262  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2263  */
2264 static const struct got_error *
2265 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2266     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2267 {
2268 	const struct got_error *err = NULL;
2269 	int cols;
2270 	wchar_t *wline = NULL;
2271 	char *exstr = NULL;
2272 	size_t wlen;
2273 	int i, scrollx;
2274 
2275 	*wlinep = NULL;
2276 	*widthp = 0;
2277 
2278 	if (expand) {
2279 		err = expand_tab(&exstr, line);
2280 		if (err)
2281 			return err;
2282 	}
2283 
2284 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2285 	free(exstr);
2286 	if (err)
2287 		return err;
2288 
2289 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2290 
2291 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2292 		wline[wlen - 1] = L'\0';
2293 		wlen--;
2294 	}
2295 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2296 		wline[wlen - 1] = L'\0';
2297 		wlen--;
2298 	}
2299 
2300 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2301 	wline[i] = L'\0';
2302 
2303 	if (widthp)
2304 		*widthp = cols;
2305 	if (scrollxp)
2306 		*scrollxp = scrollx;
2307 	if (err)
2308 		free(wline);
2309 	else
2310 		*wlinep = wline;
2311 	return err;
2312 }
2313 
2314 static const struct got_error*
2315 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2316     struct got_object_id *id, struct got_repository *repo)
2317 {
2318 	static const struct got_error *err = NULL;
2319 	struct got_reflist_entry *re;
2320 	char *s;
2321 	const char *name;
2322 
2323 	*refs_str = NULL;
2324 
2325 	TAILQ_FOREACH(re, refs, entry) {
2326 		struct got_tag_object *tag = NULL;
2327 		struct got_object_id *ref_id;
2328 		int cmp;
2329 
2330 		name = got_ref_get_name(re->ref);
2331 		if (strcmp(name, GOT_REF_HEAD) == 0)
2332 			continue;
2333 		if (strncmp(name, "refs/", 5) == 0)
2334 			name += 5;
2335 		if (strncmp(name, "got/", 4) == 0 &&
2336 		    strncmp(name, "got/backup/", 11) != 0)
2337 			continue;
2338 		if (strncmp(name, "heads/", 6) == 0)
2339 			name += 6;
2340 		if (strncmp(name, "remotes/", 8) == 0) {
2341 			name += 8;
2342 			s = strstr(name, "/" GOT_REF_HEAD);
2343 			if (s != NULL && s[strlen(s)] == '\0')
2344 				continue;
2345 		}
2346 		err = got_ref_resolve(&ref_id, repo, re->ref);
2347 		if (err)
2348 			break;
2349 		if (strncmp(name, "tags/", 5) == 0) {
2350 			err = got_object_open_as_tag(&tag, repo, ref_id);
2351 			if (err) {
2352 				if (err->code != GOT_ERR_OBJ_TYPE) {
2353 					free(ref_id);
2354 					break;
2355 				}
2356 				/* Ref points at something other than a tag. */
2357 				err = NULL;
2358 				tag = NULL;
2359 			}
2360 		}
2361 		cmp = got_object_id_cmp(tag ?
2362 		    got_object_tag_get_object_id(tag) : ref_id, id);
2363 		free(ref_id);
2364 		if (tag)
2365 			got_object_tag_close(tag);
2366 		if (cmp != 0)
2367 			continue;
2368 		s = *refs_str;
2369 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2370 		    s ? ", " : "", name) == -1) {
2371 			err = got_error_from_errno("asprintf");
2372 			free(s);
2373 			*refs_str = NULL;
2374 			break;
2375 		}
2376 		free(s);
2377 	}
2378 
2379 	return err;
2380 }
2381 
2382 static const struct got_error *
2383 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2384     int col_tab_align)
2385 {
2386 	char *smallerthan;
2387 
2388 	smallerthan = strchr(author, '<');
2389 	if (smallerthan && smallerthan[1] != '\0')
2390 		author = smallerthan + 1;
2391 	author[strcspn(author, "@>")] = '\0';
2392 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2393 	    col_tab_align, 0);
2394 }
2395 
2396 static const struct got_error *
2397 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2398     struct got_object_id *id, const size_t date_display_cols,
2399     int author_display_cols)
2400 {
2401 	struct tog_log_view_state *s = &view->state.log;
2402 	const struct got_error *err = NULL;
2403 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2404 	char *logmsg0 = NULL, *logmsg = NULL;
2405 	char *author = NULL;
2406 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2407 	int author_width, logmsg_width;
2408 	char *newline, *line = NULL;
2409 	int col, limit, scrollx;
2410 	const int avail = view->ncols;
2411 	struct tm tm;
2412 	time_t committer_time;
2413 	struct tog_color *tc;
2414 
2415 	committer_time = got_object_commit_get_committer_time(commit);
2416 	if (gmtime_r(&committer_time, &tm) == NULL)
2417 		return got_error_from_errno("gmtime_r");
2418 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2419 		return got_error(GOT_ERR_NO_SPACE);
2420 
2421 	if (avail <= date_display_cols)
2422 		limit = MIN(sizeof(datebuf) - 1, avail);
2423 	else
2424 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2425 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2426 	if (tc)
2427 		wattr_on(view->window,
2428 		    COLOR_PAIR(tc->colorpair), NULL);
2429 	waddnstr(view->window, datebuf, limit);
2430 	if (tc)
2431 		wattr_off(view->window,
2432 		    COLOR_PAIR(tc->colorpair), NULL);
2433 	col = limit;
2434 	if (col > avail)
2435 		goto done;
2436 
2437 	if (avail >= 120) {
2438 		char *id_str;
2439 		err = got_object_id_str(&id_str, id);
2440 		if (err)
2441 			goto done;
2442 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2443 		if (tc)
2444 			wattr_on(view->window,
2445 			    COLOR_PAIR(tc->colorpair), NULL);
2446 		wprintw(view->window, "%.8s ", id_str);
2447 		if (tc)
2448 			wattr_off(view->window,
2449 			    COLOR_PAIR(tc->colorpair), NULL);
2450 		free(id_str);
2451 		col += 9;
2452 		if (col > avail)
2453 			goto done;
2454 	}
2455 
2456 	if (s->use_committer)
2457 		author = strdup(got_object_commit_get_committer(commit));
2458 	else
2459 		author = strdup(got_object_commit_get_author(commit));
2460 	if (author == NULL) {
2461 		err = got_error_from_errno("strdup");
2462 		goto done;
2463 	}
2464 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2465 	if (err)
2466 		goto done;
2467 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2468 	if (tc)
2469 		wattr_on(view->window,
2470 		    COLOR_PAIR(tc->colorpair), NULL);
2471 	waddwstr(view->window, wauthor);
2472 	col += author_width;
2473 	while (col < avail && author_width < author_display_cols + 2) {
2474 		waddch(view->window, ' ');
2475 		col++;
2476 		author_width++;
2477 	}
2478 	if (tc)
2479 		wattr_off(view->window,
2480 		    COLOR_PAIR(tc->colorpair), NULL);
2481 	if (col > avail)
2482 		goto done;
2483 
2484 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2485 	if (err)
2486 		goto done;
2487 	logmsg = logmsg0;
2488 	while (*logmsg == '\n')
2489 		logmsg++;
2490 	newline = strchr(logmsg, '\n');
2491 	if (newline)
2492 		*newline = '\0';
2493 	limit = avail - col;
2494 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2495 		limit--;	/* for the border */
2496 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2497 	    limit, col, 1);
2498 	if (err)
2499 		goto done;
2500 	waddwstr(view->window, &wlogmsg[scrollx]);
2501 	col += MAX(logmsg_width, 0);
2502 	while (col < avail) {
2503 		waddch(view->window, ' ');
2504 		col++;
2505 	}
2506 done:
2507 	free(logmsg0);
2508 	free(wlogmsg);
2509 	free(author);
2510 	free(wauthor);
2511 	free(line);
2512 	return err;
2513 }
2514 
2515 static struct commit_queue_entry *
2516 alloc_commit_queue_entry(struct got_commit_object *commit,
2517     struct got_object_id *id)
2518 {
2519 	struct commit_queue_entry *entry;
2520 	struct got_object_id *dup;
2521 
2522 	entry = calloc(1, sizeof(*entry));
2523 	if (entry == NULL)
2524 		return NULL;
2525 
2526 	dup = got_object_id_dup(id);
2527 	if (dup == NULL) {
2528 		free(entry);
2529 		return NULL;
2530 	}
2531 
2532 	entry->id = dup;
2533 	entry->commit = commit;
2534 	return entry;
2535 }
2536 
2537 static void
2538 pop_commit(struct commit_queue *commits)
2539 {
2540 	struct commit_queue_entry *entry;
2541 
2542 	entry = TAILQ_FIRST(&commits->head);
2543 	TAILQ_REMOVE(&commits->head, entry, entry);
2544 	got_object_commit_close(entry->commit);
2545 	commits->ncommits--;
2546 	free(entry->id);
2547 	free(entry);
2548 }
2549 
2550 static void
2551 free_commits(struct commit_queue *commits)
2552 {
2553 	while (!TAILQ_EMPTY(&commits->head))
2554 		pop_commit(commits);
2555 }
2556 
2557 static const struct got_error *
2558 match_commit(int *have_match, struct got_object_id *id,
2559     struct got_commit_object *commit, regex_t *regex)
2560 {
2561 	const struct got_error *err = NULL;
2562 	regmatch_t regmatch;
2563 	char *id_str = NULL, *logmsg = NULL;
2564 
2565 	*have_match = 0;
2566 
2567 	err = got_object_id_str(&id_str, id);
2568 	if (err)
2569 		return err;
2570 
2571 	err = got_object_commit_get_logmsg(&logmsg, commit);
2572 	if (err)
2573 		goto done;
2574 
2575 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2576 	    &regmatch, 0) == 0 ||
2577 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2578 	    &regmatch, 0) == 0 ||
2579 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2580 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2581 		*have_match = 1;
2582 done:
2583 	free(id_str);
2584 	free(logmsg);
2585 	return err;
2586 }
2587 
2588 static const struct got_error *
2589 queue_commits(struct tog_log_thread_args *a)
2590 {
2591 	const struct got_error *err = NULL;
2592 
2593 	/*
2594 	 * We keep all commits open throughout the lifetime of the log
2595 	 * view in order to avoid having to re-fetch commits from disk
2596 	 * while updating the display.
2597 	 */
2598 	do {
2599 		struct got_object_id id;
2600 		struct got_commit_object *commit;
2601 		struct commit_queue_entry *entry;
2602 		int limit_match = 0;
2603 		int errcode;
2604 
2605 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2606 		    NULL, NULL);
2607 		if (err)
2608 			break;
2609 
2610 		err = got_object_open_as_commit(&commit, a->repo, &id);
2611 		if (err)
2612 			break;
2613 		entry = alloc_commit_queue_entry(commit, &id);
2614 		if (entry == NULL) {
2615 			err = got_error_from_errno("alloc_commit_queue_entry");
2616 			break;
2617 		}
2618 
2619 		errcode = pthread_mutex_lock(&tog_mutex);
2620 		if (errcode) {
2621 			err = got_error_set_errno(errcode,
2622 			    "pthread_mutex_lock");
2623 			break;
2624 		}
2625 
2626 		entry->idx = a->real_commits->ncommits;
2627 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2628 		a->real_commits->ncommits++;
2629 
2630 		if (*a->limiting) {
2631 			err = match_commit(&limit_match, &id, commit,
2632 			    a->limit_regex);
2633 			if (err)
2634 				break;
2635 
2636 			if (limit_match) {
2637 				struct commit_queue_entry *matched;
2638 
2639 				matched = alloc_commit_queue_entry(
2640 				    entry->commit, entry->id);
2641 				if (matched == NULL) {
2642 					err = got_error_from_errno(
2643 					    "alloc_commit_queue_entry");
2644 					break;
2645 				}
2646 				matched->commit = entry->commit;
2647 				got_object_commit_retain(entry->commit);
2648 
2649 				matched->idx = a->limit_commits->ncommits;
2650 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2651 				    matched, entry);
2652 				a->limit_commits->ncommits++;
2653 			}
2654 
2655 			/*
2656 			 * This is how we signal log_thread() that we
2657 			 * have found a match, and that it should be
2658 			 * counted as a new entry for the view.
2659 			 */
2660 			a->limit_match = limit_match;
2661 		}
2662 
2663 		if (*a->searching == TOG_SEARCH_FORWARD &&
2664 		    !*a->search_next_done) {
2665 			int have_match;
2666 			err = match_commit(&have_match, &id, commit, a->regex);
2667 			if (err)
2668 				break;
2669 
2670 			if (*a->limiting) {
2671 				if (limit_match && have_match)
2672 					*a->search_next_done =
2673 					    TOG_SEARCH_HAVE_MORE;
2674 			} else if (have_match)
2675 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2676 		}
2677 
2678 		errcode = pthread_mutex_unlock(&tog_mutex);
2679 		if (errcode && err == NULL)
2680 			err = got_error_set_errno(errcode,
2681 			    "pthread_mutex_unlock");
2682 		if (err)
2683 			break;
2684 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2685 
2686 	return err;
2687 }
2688 
2689 static void
2690 select_commit(struct tog_log_view_state *s)
2691 {
2692 	struct commit_queue_entry *entry;
2693 	int ncommits = 0;
2694 
2695 	entry = s->first_displayed_entry;
2696 	while (entry) {
2697 		if (ncommits == s->selected) {
2698 			s->selected_entry = entry;
2699 			break;
2700 		}
2701 		entry = TAILQ_NEXT(entry, entry);
2702 		ncommits++;
2703 	}
2704 }
2705 
2706 static const struct got_error *
2707 draw_commits(struct tog_view *view)
2708 {
2709 	const struct got_error *err = NULL;
2710 	struct tog_log_view_state *s = &view->state.log;
2711 	struct commit_queue_entry *entry = s->selected_entry;
2712 	int limit = view->nlines;
2713 	int width;
2714 	int ncommits, author_cols = 4;
2715 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2716 	char *refs_str = NULL;
2717 	wchar_t *wline;
2718 	struct tog_color *tc;
2719 	static const size_t date_display_cols = 12;
2720 
2721 	if (view_is_hsplit_top(view))
2722 		--limit;  /* account for border */
2723 
2724 	if (s->selected_entry &&
2725 	    !(view->searching && view->search_next_done == 0)) {
2726 		struct got_reflist_head *refs;
2727 		err = got_object_id_str(&id_str, s->selected_entry->id);
2728 		if (err)
2729 			return err;
2730 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2731 		    s->selected_entry->id);
2732 		if (refs) {
2733 			err = build_refs_str(&refs_str, refs,
2734 			    s->selected_entry->id, s->repo);
2735 			if (err)
2736 				goto done;
2737 		}
2738 	}
2739 
2740 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2741 		halfdelay(10); /* disable fast refresh */
2742 
2743 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2744 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2745 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2746 		    (view->searching && !view->search_next_done) ?
2747 		    "searching..." : "loading...") == -1) {
2748 			err = got_error_from_errno("asprintf");
2749 			goto done;
2750 		}
2751 	} else {
2752 		const char *search_str = NULL;
2753 		const char *limit_str = NULL;
2754 
2755 		if (view->searching) {
2756 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2757 				search_str = "no more matches";
2758 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2759 				search_str = "no matches found";
2760 			else if (!view->search_next_done)
2761 				search_str = "searching...";
2762 		}
2763 
2764 		if (s->limit_view && s->commits->ncommits == 0)
2765 			limit_str = "no matches found";
2766 
2767 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2768 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2769 		    search_str ? search_str : (refs_str ? refs_str : ""),
2770 		    limit_str ? limit_str : "") == -1) {
2771 			err = got_error_from_errno("asprintf");
2772 			goto done;
2773 		}
2774 	}
2775 
2776 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2777 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2778 		    "........................................",
2779 		    s->in_repo_path, ncommits_str) == -1) {
2780 			err = got_error_from_errno("asprintf");
2781 			header = NULL;
2782 			goto done;
2783 		}
2784 	} else if (asprintf(&header, "commit %s%s",
2785 	    id_str ? id_str : "........................................",
2786 	    ncommits_str) == -1) {
2787 		err = got_error_from_errno("asprintf");
2788 		header = NULL;
2789 		goto done;
2790 	}
2791 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2792 	if (err)
2793 		goto done;
2794 
2795 	werase(view->window);
2796 
2797 	if (view_needs_focus_indication(view))
2798 		wstandout(view->window);
2799 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2800 	if (tc)
2801 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2802 	waddwstr(view->window, wline);
2803 	while (width < view->ncols) {
2804 		waddch(view->window, ' ');
2805 		width++;
2806 	}
2807 	if (tc)
2808 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2809 	if (view_needs_focus_indication(view))
2810 		wstandend(view->window);
2811 	free(wline);
2812 	if (limit <= 1)
2813 		goto done;
2814 
2815 	/* Grow author column size if necessary, and set view->maxx. */
2816 	entry = s->first_displayed_entry;
2817 	ncommits = 0;
2818 	view->maxx = 0;
2819 	while (entry) {
2820 		struct got_commit_object *c = entry->commit;
2821 		char *author, *eol, *msg, *msg0;
2822 		wchar_t *wauthor, *wmsg;
2823 		int width;
2824 		if (ncommits >= limit - 1)
2825 			break;
2826 		if (s->use_committer)
2827 			author = strdup(got_object_commit_get_committer(c));
2828 		else
2829 			author = strdup(got_object_commit_get_author(c));
2830 		if (author == NULL) {
2831 			err = got_error_from_errno("strdup");
2832 			goto done;
2833 		}
2834 		err = format_author(&wauthor, &width, author, COLS,
2835 		    date_display_cols);
2836 		if (author_cols < width)
2837 			author_cols = width;
2838 		free(wauthor);
2839 		free(author);
2840 		if (err)
2841 			goto done;
2842 		err = got_object_commit_get_logmsg(&msg0, c);
2843 		if (err)
2844 			goto done;
2845 		msg = msg0;
2846 		while (*msg == '\n')
2847 			++msg;
2848 		if ((eol = strchr(msg, '\n')))
2849 			*eol = '\0';
2850 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2851 		    date_display_cols + author_cols, 0);
2852 		if (err)
2853 			goto done;
2854 		view->maxx = MAX(view->maxx, width);
2855 		free(msg0);
2856 		free(wmsg);
2857 		ncommits++;
2858 		entry = TAILQ_NEXT(entry, entry);
2859 	}
2860 
2861 	entry = s->first_displayed_entry;
2862 	s->last_displayed_entry = s->first_displayed_entry;
2863 	ncommits = 0;
2864 	while (entry) {
2865 		if (ncommits >= limit - 1)
2866 			break;
2867 		if (ncommits == s->selected)
2868 			wstandout(view->window);
2869 		err = draw_commit(view, entry->commit, entry->id,
2870 		    date_display_cols, author_cols);
2871 		if (ncommits == s->selected)
2872 			wstandend(view->window);
2873 		if (err)
2874 			goto done;
2875 		ncommits++;
2876 		s->last_displayed_entry = entry;
2877 		entry = TAILQ_NEXT(entry, entry);
2878 	}
2879 
2880 	view_border(view);
2881 done:
2882 	free(id_str);
2883 	free(refs_str);
2884 	free(ncommits_str);
2885 	free(header);
2886 	return err;
2887 }
2888 
2889 static void
2890 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2891 {
2892 	struct commit_queue_entry *entry;
2893 	int nscrolled = 0;
2894 
2895 	entry = TAILQ_FIRST(&s->commits->head);
2896 	if (s->first_displayed_entry == entry)
2897 		return;
2898 
2899 	entry = s->first_displayed_entry;
2900 	while (entry && nscrolled < maxscroll) {
2901 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2902 		if (entry) {
2903 			s->first_displayed_entry = entry;
2904 			nscrolled++;
2905 		}
2906 	}
2907 }
2908 
2909 static const struct got_error *
2910 trigger_log_thread(struct tog_view *view, int wait)
2911 {
2912 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2913 	int errcode;
2914 
2915 	if (!using_mock_io)
2916 		halfdelay(1); /* fast refresh while loading commits */
2917 
2918 	while (!ta->log_complete && !tog_thread_error &&
2919 	    (ta->commits_needed > 0 || ta->load_all)) {
2920 		/* Wake the log thread. */
2921 		errcode = pthread_cond_signal(&ta->need_commits);
2922 		if (errcode)
2923 			return got_error_set_errno(errcode,
2924 			    "pthread_cond_signal");
2925 
2926 		/*
2927 		 * The mutex will be released while the view loop waits
2928 		 * in wgetch(), at which time the log thread will run.
2929 		 */
2930 		if (!wait)
2931 			break;
2932 
2933 		/* Display progress update in log view. */
2934 		show_log_view(view);
2935 		update_panels();
2936 		doupdate();
2937 
2938 		/* Wait right here while next commit is being loaded. */
2939 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2940 		if (errcode)
2941 			return got_error_set_errno(errcode,
2942 			    "pthread_cond_wait");
2943 
2944 		/* Display progress update in log view. */
2945 		show_log_view(view);
2946 		update_panels();
2947 		doupdate();
2948 	}
2949 
2950 	return NULL;
2951 }
2952 
2953 static const struct got_error *
2954 request_log_commits(struct tog_view *view)
2955 {
2956 	struct tog_log_view_state	*state = &view->state.log;
2957 	const struct got_error		*err = NULL;
2958 
2959 	if (state->thread_args.log_complete)
2960 		return NULL;
2961 
2962 	state->thread_args.commits_needed += view->nscrolled;
2963 	err = trigger_log_thread(view, 1);
2964 	view->nscrolled = 0;
2965 
2966 	return err;
2967 }
2968 
2969 static const struct got_error *
2970 log_scroll_down(struct tog_view *view, int maxscroll)
2971 {
2972 	struct tog_log_view_state *s = &view->state.log;
2973 	const struct got_error *err = NULL;
2974 	struct commit_queue_entry *pentry;
2975 	int nscrolled = 0, ncommits_needed;
2976 
2977 	if (s->last_displayed_entry == NULL)
2978 		return NULL;
2979 
2980 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2981 	if (s->commits->ncommits < ncommits_needed &&
2982 	    !s->thread_args.log_complete) {
2983 		/*
2984 		 * Ask the log thread for required amount of commits.
2985 		 */
2986 		s->thread_args.commits_needed +=
2987 		    ncommits_needed - s->commits->ncommits;
2988 		err = trigger_log_thread(view, 1);
2989 		if (err)
2990 			return err;
2991 	}
2992 
2993 	do {
2994 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2995 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2996 			break;
2997 
2998 		s->last_displayed_entry = pentry ?
2999 		    pentry : s->last_displayed_entry;
3000 
3001 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3002 		if (pentry == NULL)
3003 			break;
3004 		s->first_displayed_entry = pentry;
3005 	} while (++nscrolled < maxscroll);
3006 
3007 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3008 		view->nscrolled += nscrolled;
3009 	else
3010 		view->nscrolled = 0;
3011 
3012 	return err;
3013 }
3014 
3015 static const struct got_error *
3016 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3017     struct got_commit_object *commit, struct got_object_id *commit_id,
3018     struct tog_view *log_view, struct got_repository *repo)
3019 {
3020 	const struct got_error *err;
3021 	struct got_object_qid *parent_id;
3022 	struct tog_view *diff_view;
3023 
3024 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3025 	if (diff_view == NULL)
3026 		return got_error_from_errno("view_open");
3027 
3028 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3029 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3030 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3031 	if (err == NULL)
3032 		*new_view = diff_view;
3033 	return err;
3034 }
3035 
3036 static const struct got_error *
3037 tree_view_visit_subtree(struct tog_tree_view_state *s,
3038     struct got_tree_object *subtree)
3039 {
3040 	struct tog_parent_tree *parent;
3041 
3042 	parent = calloc(1, sizeof(*parent));
3043 	if (parent == NULL)
3044 		return got_error_from_errno("calloc");
3045 
3046 	parent->tree = s->tree;
3047 	parent->first_displayed_entry = s->first_displayed_entry;
3048 	parent->selected_entry = s->selected_entry;
3049 	parent->selected = s->selected;
3050 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3051 	s->tree = subtree;
3052 	s->selected = 0;
3053 	s->first_displayed_entry = NULL;
3054 	return NULL;
3055 }
3056 
3057 static const struct got_error *
3058 tree_view_walk_path(struct tog_tree_view_state *s,
3059     struct got_commit_object *commit, const char *path)
3060 {
3061 	const struct got_error *err = NULL;
3062 	struct got_tree_object *tree = NULL;
3063 	const char *p;
3064 	char *slash, *subpath = NULL;
3065 
3066 	/* Walk the path and open corresponding tree objects. */
3067 	p = path;
3068 	while (*p) {
3069 		struct got_tree_entry *te;
3070 		struct got_object_id *tree_id;
3071 		char *te_name;
3072 
3073 		while (p[0] == '/')
3074 			p++;
3075 
3076 		/* Ensure the correct subtree entry is selected. */
3077 		slash = strchr(p, '/');
3078 		if (slash == NULL)
3079 			te_name = strdup(p);
3080 		else
3081 			te_name = strndup(p, slash - p);
3082 		if (te_name == NULL) {
3083 			err = got_error_from_errno("strndup");
3084 			break;
3085 		}
3086 		te = got_object_tree_find_entry(s->tree, te_name);
3087 		if (te == NULL) {
3088 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3089 			free(te_name);
3090 			break;
3091 		}
3092 		free(te_name);
3093 		s->first_displayed_entry = s->selected_entry = te;
3094 
3095 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3096 			break; /* jump to this file's entry */
3097 
3098 		slash = strchr(p, '/');
3099 		if (slash)
3100 			subpath = strndup(path, slash - path);
3101 		else
3102 			subpath = strdup(path);
3103 		if (subpath == NULL) {
3104 			err = got_error_from_errno("strdup");
3105 			break;
3106 		}
3107 
3108 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3109 		    subpath);
3110 		if (err)
3111 			break;
3112 
3113 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3114 		free(tree_id);
3115 		if (err)
3116 			break;
3117 
3118 		err = tree_view_visit_subtree(s, tree);
3119 		if (err) {
3120 			got_object_tree_close(tree);
3121 			break;
3122 		}
3123 		if (slash == NULL)
3124 			break;
3125 		free(subpath);
3126 		subpath = NULL;
3127 		p = slash;
3128 	}
3129 
3130 	free(subpath);
3131 	return err;
3132 }
3133 
3134 static const struct got_error *
3135 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3136     struct commit_queue_entry *entry, const char *path,
3137     const char *head_ref_name, struct got_repository *repo)
3138 {
3139 	const struct got_error *err = NULL;
3140 	struct tog_tree_view_state *s;
3141 	struct tog_view *tree_view;
3142 
3143 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3144 	if (tree_view == NULL)
3145 		return got_error_from_errno("view_open");
3146 
3147 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3148 	if (err)
3149 		return err;
3150 	s = &tree_view->state.tree;
3151 
3152 	*new_view = tree_view;
3153 
3154 	if (got_path_is_root_dir(path))
3155 		return NULL;
3156 
3157 	return tree_view_walk_path(s, entry->commit, path);
3158 }
3159 
3160 static const struct got_error *
3161 block_signals_used_by_main_thread(void)
3162 {
3163 	sigset_t sigset;
3164 	int errcode;
3165 
3166 	if (sigemptyset(&sigset) == -1)
3167 		return got_error_from_errno("sigemptyset");
3168 
3169 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3170 	if (sigaddset(&sigset, SIGWINCH) == -1)
3171 		return got_error_from_errno("sigaddset");
3172 	if (sigaddset(&sigset, SIGCONT) == -1)
3173 		return got_error_from_errno("sigaddset");
3174 	if (sigaddset(&sigset, SIGINT) == -1)
3175 		return got_error_from_errno("sigaddset");
3176 	if (sigaddset(&sigset, SIGTERM) == -1)
3177 		return got_error_from_errno("sigaddset");
3178 
3179 	/* ncurses handles SIGTSTP */
3180 	if (sigaddset(&sigset, SIGTSTP) == -1)
3181 		return got_error_from_errno("sigaddset");
3182 
3183 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3184 	if (errcode)
3185 		return got_error_set_errno(errcode, "pthread_sigmask");
3186 
3187 	return NULL;
3188 }
3189 
3190 static void *
3191 log_thread(void *arg)
3192 {
3193 	const struct got_error *err = NULL;
3194 	int errcode = 0;
3195 	struct tog_log_thread_args *a = arg;
3196 	int done = 0;
3197 
3198 	/*
3199 	 * Sync startup with main thread such that we begin our
3200 	 * work once view_input() has released the mutex.
3201 	 */
3202 	errcode = pthread_mutex_lock(&tog_mutex);
3203 	if (errcode) {
3204 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3205 		return (void *)err;
3206 	}
3207 
3208 	err = block_signals_used_by_main_thread();
3209 	if (err) {
3210 		pthread_mutex_unlock(&tog_mutex);
3211 		goto done;
3212 	}
3213 
3214 	while (!done && !err && !tog_fatal_signal_received()) {
3215 		errcode = pthread_mutex_unlock(&tog_mutex);
3216 		if (errcode) {
3217 			err = got_error_set_errno(errcode,
3218 			    "pthread_mutex_unlock");
3219 			goto done;
3220 		}
3221 		err = queue_commits(a);
3222 		if (err) {
3223 			if (err->code != GOT_ERR_ITER_COMPLETED)
3224 				goto done;
3225 			err = NULL;
3226 			done = 1;
3227 		} else if (a->commits_needed > 0 && !a->load_all) {
3228 			if (*a->limiting) {
3229 				if (a->limit_match)
3230 					a->commits_needed--;
3231 			} else
3232 				a->commits_needed--;
3233 		}
3234 
3235 		errcode = pthread_mutex_lock(&tog_mutex);
3236 		if (errcode) {
3237 			err = got_error_set_errno(errcode,
3238 			    "pthread_mutex_lock");
3239 			goto done;
3240 		} else if (*a->quit)
3241 			done = 1;
3242 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3243 			*a->first_displayed_entry =
3244 			    TAILQ_FIRST(&a->limit_commits->head);
3245 			*a->selected_entry = *a->first_displayed_entry;
3246 		} else if (*a->first_displayed_entry == NULL) {
3247 			*a->first_displayed_entry =
3248 			    TAILQ_FIRST(&a->real_commits->head);
3249 			*a->selected_entry = *a->first_displayed_entry;
3250 		}
3251 
3252 		errcode = pthread_cond_signal(&a->commit_loaded);
3253 		if (errcode) {
3254 			err = got_error_set_errno(errcode,
3255 			    "pthread_cond_signal");
3256 			pthread_mutex_unlock(&tog_mutex);
3257 			goto done;
3258 		}
3259 
3260 		if (done)
3261 			a->commits_needed = 0;
3262 		else {
3263 			if (a->commits_needed == 0 && !a->load_all) {
3264 				errcode = pthread_cond_wait(&a->need_commits,
3265 				    &tog_mutex);
3266 				if (errcode) {
3267 					err = got_error_set_errno(errcode,
3268 					    "pthread_cond_wait");
3269 					pthread_mutex_unlock(&tog_mutex);
3270 					goto done;
3271 				}
3272 				if (*a->quit)
3273 					done = 1;
3274 			}
3275 		}
3276 	}
3277 	a->log_complete = 1;
3278 	errcode = pthread_mutex_unlock(&tog_mutex);
3279 	if (errcode)
3280 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3281 done:
3282 	if (err) {
3283 		tog_thread_error = 1;
3284 		pthread_cond_signal(&a->commit_loaded);
3285 	}
3286 	return (void *)err;
3287 }
3288 
3289 static const struct got_error *
3290 stop_log_thread(struct tog_log_view_state *s)
3291 {
3292 	const struct got_error *err = NULL, *thread_err = NULL;
3293 	int errcode;
3294 
3295 	if (s->thread) {
3296 		s->quit = 1;
3297 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3298 		if (errcode)
3299 			return got_error_set_errno(errcode,
3300 			    "pthread_cond_signal");
3301 		errcode = pthread_mutex_unlock(&tog_mutex);
3302 		if (errcode)
3303 			return got_error_set_errno(errcode,
3304 			    "pthread_mutex_unlock");
3305 		errcode = pthread_join(s->thread, (void **)&thread_err);
3306 		if (errcode)
3307 			return got_error_set_errno(errcode, "pthread_join");
3308 		errcode = pthread_mutex_lock(&tog_mutex);
3309 		if (errcode)
3310 			return got_error_set_errno(errcode,
3311 			    "pthread_mutex_lock");
3312 		s->thread = NULL;
3313 	}
3314 
3315 	if (s->thread_args.repo) {
3316 		err = got_repo_close(s->thread_args.repo);
3317 		s->thread_args.repo = NULL;
3318 	}
3319 
3320 	if (s->thread_args.pack_fds) {
3321 		const struct got_error *pack_err =
3322 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3323 		if (err == NULL)
3324 			err = pack_err;
3325 		s->thread_args.pack_fds = NULL;
3326 	}
3327 
3328 	if (s->thread_args.graph) {
3329 		got_commit_graph_close(s->thread_args.graph);
3330 		s->thread_args.graph = NULL;
3331 	}
3332 
3333 	return err ? err : thread_err;
3334 }
3335 
3336 static const struct got_error *
3337 close_log_view(struct tog_view *view)
3338 {
3339 	const struct got_error *err = NULL;
3340 	struct tog_log_view_state *s = &view->state.log;
3341 	int errcode;
3342 
3343 	err = stop_log_thread(s);
3344 
3345 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3346 	if (errcode && err == NULL)
3347 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3348 
3349 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3350 	if (errcode && err == NULL)
3351 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3352 
3353 	free_commits(&s->limit_commits);
3354 	free_commits(&s->real_commits);
3355 	free(s->in_repo_path);
3356 	s->in_repo_path = NULL;
3357 	free(s->start_id);
3358 	s->start_id = NULL;
3359 	free(s->head_ref_name);
3360 	s->head_ref_name = NULL;
3361 	return err;
3362 }
3363 
3364 /*
3365  * We use two queues to implement the limit feature: first consists of
3366  * commits matching the current limit_regex; second is the real queue
3367  * of all known commits (real_commits). When the user starts limiting,
3368  * we swap queues such that all movement and displaying functionality
3369  * works with very slight change.
3370  */
3371 static const struct got_error *
3372 limit_log_view(struct tog_view *view)
3373 {
3374 	struct tog_log_view_state *s = &view->state.log;
3375 	struct commit_queue_entry *entry;
3376 	struct tog_view	*v = view;
3377 	const struct got_error *err = NULL;
3378 	char pattern[1024];
3379 	int ret;
3380 
3381 	if (view_is_hsplit_top(view))
3382 		v = view->child;
3383 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3384 		v = view->parent;
3385 
3386 	/* Get the pattern */
3387 	wmove(v->window, v->nlines - 1, 0);
3388 	wclrtoeol(v->window);
3389 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3390 	nodelay(v->window, FALSE);
3391 	nocbreak();
3392 	echo();
3393 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3394 	cbreak();
3395 	noecho();
3396 	nodelay(v->window, TRUE);
3397 	if (ret == ERR)
3398 		return NULL;
3399 
3400 	if (*pattern == '\0') {
3401 		/*
3402 		 * Safety measure for the situation where the user
3403 		 * resets limit without previously limiting anything.
3404 		 */
3405 		if (!s->limit_view)
3406 			return NULL;
3407 
3408 		/*
3409 		 * User could have pressed Ctrl+L, which refreshed the
3410 		 * commit queues, it means we can't save previously
3411 		 * (before limit took place) displayed entries,
3412 		 * because they would point to already free'ed memory,
3413 		 * so we are forced to always select first entry of
3414 		 * the queue.
3415 		 */
3416 		s->commits = &s->real_commits;
3417 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3418 		s->selected_entry = s->first_displayed_entry;
3419 		s->selected = 0;
3420 		s->limit_view = 0;
3421 
3422 		return NULL;
3423 	}
3424 
3425 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3426 		return NULL;
3427 
3428 	s->limit_view = 1;
3429 
3430 	/* Clear the screen while loading limit view */
3431 	s->first_displayed_entry = NULL;
3432 	s->last_displayed_entry = NULL;
3433 	s->selected_entry = NULL;
3434 	s->commits = &s->limit_commits;
3435 
3436 	/* Prepare limit queue for new search */
3437 	free_commits(&s->limit_commits);
3438 	s->limit_commits.ncommits = 0;
3439 
3440 	/* First process commits, which are in queue already */
3441 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3442 		int have_match = 0;
3443 
3444 		err = match_commit(&have_match, entry->id,
3445 		    entry->commit, &s->limit_regex);
3446 		if (err)
3447 			return err;
3448 
3449 		if (have_match) {
3450 			struct commit_queue_entry *matched;
3451 
3452 			matched = alloc_commit_queue_entry(entry->commit,
3453 			    entry->id);
3454 			if (matched == NULL) {
3455 				err = got_error_from_errno(
3456 				    "alloc_commit_queue_entry");
3457 				break;
3458 			}
3459 			matched->commit = entry->commit;
3460 			got_object_commit_retain(entry->commit);
3461 
3462 			matched->idx = s->limit_commits.ncommits;
3463 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3464 			    matched, entry);
3465 			s->limit_commits.ncommits++;
3466 		}
3467 	}
3468 
3469 	/* Second process all the commits, until we fill the screen */
3470 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3471 	    !s->thread_args.log_complete) {
3472 		s->thread_args.commits_needed +=
3473 		    view->nlines - s->limit_commits.ncommits - 1;
3474 		err = trigger_log_thread(view, 1);
3475 		if (err)
3476 			return err;
3477 	}
3478 
3479 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3480 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3481 	s->selected = 0;
3482 
3483 	return NULL;
3484 }
3485 
3486 static const struct got_error *
3487 search_start_log_view(struct tog_view *view)
3488 {
3489 	struct tog_log_view_state *s = &view->state.log;
3490 
3491 	s->matched_entry = NULL;
3492 	s->search_entry = NULL;
3493 	return NULL;
3494 }
3495 
3496 static const struct got_error *
3497 search_next_log_view(struct tog_view *view)
3498 {
3499 	const struct got_error *err = NULL;
3500 	struct tog_log_view_state *s = &view->state.log;
3501 	struct commit_queue_entry *entry;
3502 
3503 	/* Display progress update in log view. */
3504 	show_log_view(view);
3505 	update_panels();
3506 	doupdate();
3507 
3508 	if (s->search_entry) {
3509 		int errcode, ch;
3510 		errcode = pthread_mutex_unlock(&tog_mutex);
3511 		if (errcode)
3512 			return got_error_set_errno(errcode,
3513 			    "pthread_mutex_unlock");
3514 		ch = wgetch(view->window);
3515 		errcode = pthread_mutex_lock(&tog_mutex);
3516 		if (errcode)
3517 			return got_error_set_errno(errcode,
3518 			    "pthread_mutex_lock");
3519 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3520 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3521 			return NULL;
3522 		}
3523 		if (view->searching == TOG_SEARCH_FORWARD)
3524 			entry = TAILQ_NEXT(s->search_entry, entry);
3525 		else
3526 			entry = TAILQ_PREV(s->search_entry,
3527 			    commit_queue_head, entry);
3528 	} else if (s->matched_entry) {
3529 		/*
3530 		 * If the user has moved the cursor after we hit a match,
3531 		 * the position from where we should continue searching
3532 		 * might have changed.
3533 		 */
3534 		if (view->searching == TOG_SEARCH_FORWARD)
3535 			entry = TAILQ_NEXT(s->selected_entry, entry);
3536 		else
3537 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3538 			    entry);
3539 	} else {
3540 		entry = s->selected_entry;
3541 	}
3542 
3543 	while (1) {
3544 		int have_match = 0;
3545 
3546 		if (entry == NULL) {
3547 			if (s->thread_args.log_complete ||
3548 			    view->searching == TOG_SEARCH_BACKWARD) {
3549 				view->search_next_done =
3550 				    (s->matched_entry == NULL ?
3551 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3552 				s->search_entry = NULL;
3553 				return NULL;
3554 			}
3555 			/*
3556 			 * Poke the log thread for more commits and return,
3557 			 * allowing the main loop to make progress. Search
3558 			 * will resume at s->search_entry once we come back.
3559 			 */
3560 			s->thread_args.commits_needed++;
3561 			return trigger_log_thread(view, 0);
3562 		}
3563 
3564 		err = match_commit(&have_match, entry->id, entry->commit,
3565 		    &view->regex);
3566 		if (err)
3567 			break;
3568 		if (have_match) {
3569 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3570 			s->matched_entry = entry;
3571 			break;
3572 		}
3573 
3574 		s->search_entry = entry;
3575 		if (view->searching == TOG_SEARCH_FORWARD)
3576 			entry = TAILQ_NEXT(entry, entry);
3577 		else
3578 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3579 	}
3580 
3581 	if (s->matched_entry) {
3582 		int cur = s->selected_entry->idx;
3583 		while (cur < s->matched_entry->idx) {
3584 			err = input_log_view(NULL, view, KEY_DOWN);
3585 			if (err)
3586 				return err;
3587 			cur++;
3588 		}
3589 		while (cur > s->matched_entry->idx) {
3590 			err = input_log_view(NULL, view, KEY_UP);
3591 			if (err)
3592 				return err;
3593 			cur--;
3594 		}
3595 	}
3596 
3597 	s->search_entry = NULL;
3598 
3599 	return NULL;
3600 }
3601 
3602 static const struct got_error *
3603 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3604     struct got_repository *repo, const char *head_ref_name,
3605     const char *in_repo_path, int log_branches)
3606 {
3607 	const struct got_error *err = NULL;
3608 	struct tog_log_view_state *s = &view->state.log;
3609 	struct got_repository *thread_repo = NULL;
3610 	struct got_commit_graph *thread_graph = NULL;
3611 	int errcode;
3612 
3613 	if (in_repo_path != s->in_repo_path) {
3614 		free(s->in_repo_path);
3615 		s->in_repo_path = strdup(in_repo_path);
3616 		if (s->in_repo_path == NULL) {
3617 			err = got_error_from_errno("strdup");
3618 			goto done;
3619 		}
3620 	}
3621 
3622 	/* The commit queue only contains commits being displayed. */
3623 	TAILQ_INIT(&s->real_commits.head);
3624 	s->real_commits.ncommits = 0;
3625 	s->commits = &s->real_commits;
3626 
3627 	TAILQ_INIT(&s->limit_commits.head);
3628 	s->limit_view = 0;
3629 	s->limit_commits.ncommits = 0;
3630 
3631 	s->repo = repo;
3632 	if (head_ref_name) {
3633 		s->head_ref_name = strdup(head_ref_name);
3634 		if (s->head_ref_name == NULL) {
3635 			err = got_error_from_errno("strdup");
3636 			goto done;
3637 		}
3638 	}
3639 	s->start_id = got_object_id_dup(start_id);
3640 	if (s->start_id == NULL) {
3641 		err = got_error_from_errno("got_object_id_dup");
3642 		goto done;
3643 	}
3644 	s->log_branches = log_branches;
3645 	s->use_committer = 1;
3646 
3647 	STAILQ_INIT(&s->colors);
3648 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3649 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3650 		    get_color_value("TOG_COLOR_COMMIT"));
3651 		if (err)
3652 			goto done;
3653 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3654 		    get_color_value("TOG_COLOR_AUTHOR"));
3655 		if (err) {
3656 			free_colors(&s->colors);
3657 			goto done;
3658 		}
3659 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3660 		    get_color_value("TOG_COLOR_DATE"));
3661 		if (err) {
3662 			free_colors(&s->colors);
3663 			goto done;
3664 		}
3665 	}
3666 
3667 	view->show = show_log_view;
3668 	view->input = input_log_view;
3669 	view->resize = resize_log_view;
3670 	view->close = close_log_view;
3671 	view->search_start = search_start_log_view;
3672 	view->search_next = search_next_log_view;
3673 
3674 	if (s->thread_args.pack_fds == NULL) {
3675 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3676 		if (err)
3677 			goto done;
3678 	}
3679 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3680 	    s->thread_args.pack_fds);
3681 	if (err)
3682 		goto done;
3683 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3684 	    !s->log_branches);
3685 	if (err)
3686 		goto done;
3687 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3688 	    s->repo, NULL, NULL);
3689 	if (err)
3690 		goto done;
3691 
3692 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3693 	if (errcode) {
3694 		err = got_error_set_errno(errcode, "pthread_cond_init");
3695 		goto done;
3696 	}
3697 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3698 	if (errcode) {
3699 		err = got_error_set_errno(errcode, "pthread_cond_init");
3700 		goto done;
3701 	}
3702 
3703 	s->thread_args.commits_needed = view->nlines;
3704 	s->thread_args.graph = thread_graph;
3705 	s->thread_args.real_commits = &s->real_commits;
3706 	s->thread_args.limit_commits = &s->limit_commits;
3707 	s->thread_args.in_repo_path = s->in_repo_path;
3708 	s->thread_args.start_id = s->start_id;
3709 	s->thread_args.repo = thread_repo;
3710 	s->thread_args.log_complete = 0;
3711 	s->thread_args.quit = &s->quit;
3712 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3713 	s->thread_args.selected_entry = &s->selected_entry;
3714 	s->thread_args.searching = &view->searching;
3715 	s->thread_args.search_next_done = &view->search_next_done;
3716 	s->thread_args.regex = &view->regex;
3717 	s->thread_args.limiting = &s->limit_view;
3718 	s->thread_args.limit_regex = &s->limit_regex;
3719 	s->thread_args.limit_commits = &s->limit_commits;
3720 done:
3721 	if (err) {
3722 		if (view->close == NULL)
3723 			close_log_view(view);
3724 		view_close(view);
3725 	}
3726 	return err;
3727 }
3728 
3729 static const struct got_error *
3730 show_log_view(struct tog_view *view)
3731 {
3732 	const struct got_error *err;
3733 	struct tog_log_view_state *s = &view->state.log;
3734 
3735 	if (s->thread == NULL) {
3736 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3737 		    &s->thread_args);
3738 		if (errcode)
3739 			return got_error_set_errno(errcode, "pthread_create");
3740 		if (s->thread_args.commits_needed > 0) {
3741 			err = trigger_log_thread(view, 1);
3742 			if (err)
3743 				return err;
3744 		}
3745 	}
3746 
3747 	return draw_commits(view);
3748 }
3749 
3750 static void
3751 log_move_cursor_up(struct tog_view *view, int page, int home)
3752 {
3753 	struct tog_log_view_state *s = &view->state.log;
3754 
3755 	if (s->first_displayed_entry == NULL)
3756 		return;
3757 	if (s->selected_entry->idx == 0)
3758 		view->count = 0;
3759 
3760 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3761 	    || home)
3762 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3763 
3764 	if (!page && !home && s->selected > 0)
3765 		--s->selected;
3766 	else
3767 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3768 
3769 	select_commit(s);
3770 	return;
3771 }
3772 
3773 static const struct got_error *
3774 log_move_cursor_down(struct tog_view *view, int page)
3775 {
3776 	struct tog_log_view_state	*s = &view->state.log;
3777 	const struct got_error		*err = NULL;
3778 	int				 eos = view->nlines - 2;
3779 
3780 	if (s->first_displayed_entry == NULL)
3781 		return NULL;
3782 
3783 	if (s->thread_args.log_complete &&
3784 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3785 		return NULL;
3786 
3787 	if (view_is_hsplit_top(view))
3788 		--eos;  /* border consumes the last line */
3789 
3790 	if (!page) {
3791 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3792 			++s->selected;
3793 		else
3794 			err = log_scroll_down(view, 1);
3795 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3796 		struct commit_queue_entry *entry;
3797 		int n;
3798 
3799 		s->selected = 0;
3800 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3801 		s->last_displayed_entry = entry;
3802 		for (n = 0; n <= eos; n++) {
3803 			if (entry == NULL)
3804 				break;
3805 			s->first_displayed_entry = entry;
3806 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3807 		}
3808 		if (n > 0)
3809 			s->selected = n - 1;
3810 	} else {
3811 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3812 		    s->thread_args.log_complete)
3813 			s->selected += MIN(page,
3814 			    s->commits->ncommits - s->selected_entry->idx - 1);
3815 		else
3816 			err = log_scroll_down(view, page);
3817 	}
3818 	if (err)
3819 		return err;
3820 
3821 	/*
3822 	 * We might necessarily overshoot in horizontal
3823 	 * splits; if so, select the last displayed commit.
3824 	 */
3825 	if (s->first_displayed_entry && s->last_displayed_entry) {
3826 		s->selected = MIN(s->selected,
3827 		    s->last_displayed_entry->idx -
3828 		    s->first_displayed_entry->idx);
3829 	}
3830 
3831 	select_commit(s);
3832 
3833 	if (s->thread_args.log_complete &&
3834 	    s->selected_entry->idx == s->commits->ncommits - 1)
3835 		view->count = 0;
3836 
3837 	return NULL;
3838 }
3839 
3840 static void
3841 view_get_split(struct tog_view *view, int *y, int *x)
3842 {
3843 	*x = 0;
3844 	*y = 0;
3845 
3846 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3847 		if (view->child && view->child->resized_y)
3848 			*y = view->child->resized_y;
3849 		else if (view->resized_y)
3850 			*y = view->resized_y;
3851 		else
3852 			*y = view_split_begin_y(view->lines);
3853 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3854 		if (view->child && view->child->resized_x)
3855 			*x = view->child->resized_x;
3856 		else if (view->resized_x)
3857 			*x = view->resized_x;
3858 		else
3859 			*x = view_split_begin_x(view->begin_x);
3860 	}
3861 }
3862 
3863 /* Split view horizontally at y and offset view->state->selected line. */
3864 static const struct got_error *
3865 view_init_hsplit(struct tog_view *view, int y)
3866 {
3867 	const struct got_error *err = NULL;
3868 
3869 	view->nlines = y;
3870 	view->ncols = COLS;
3871 	err = view_resize(view);
3872 	if (err)
3873 		return err;
3874 
3875 	err = offset_selection_down(view);
3876 
3877 	return err;
3878 }
3879 
3880 static const struct got_error *
3881 log_goto_line(struct tog_view *view, int nlines)
3882 {
3883 	const struct got_error		*err = NULL;
3884 	struct tog_log_view_state	*s = &view->state.log;
3885 	int				 g, idx = s->selected_entry->idx;
3886 
3887 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3888 		return NULL;
3889 
3890 	g = view->gline;
3891 	view->gline = 0;
3892 
3893 	if (g >= s->first_displayed_entry->idx + 1 &&
3894 	    g <= s->last_displayed_entry->idx + 1 &&
3895 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3896 		s->selected = g - s->first_displayed_entry->idx - 1;
3897 		select_commit(s);
3898 		return NULL;
3899 	}
3900 
3901 	if (idx + 1 < g) {
3902 		err = log_move_cursor_down(view, g - idx - 1);
3903 		if (!err && g > s->selected_entry->idx + 1)
3904 			err = log_move_cursor_down(view,
3905 			    g - s->first_displayed_entry->idx - 1);
3906 		if (err)
3907 			return err;
3908 	} else if (idx + 1 > g)
3909 		log_move_cursor_up(view, idx - g + 1, 0);
3910 
3911 	if (g < nlines && s->first_displayed_entry->idx == 0)
3912 		s->selected = g - 1;
3913 
3914 	select_commit(s);
3915 	return NULL;
3916 
3917 }
3918 
3919 static void
3920 horizontal_scroll_input(struct tog_view *view, int ch)
3921 {
3922 
3923 	switch (ch) {
3924 	case KEY_LEFT:
3925 	case 'h':
3926 		view->x -= MIN(view->x, 2);
3927 		if (view->x <= 0)
3928 			view->count = 0;
3929 		break;
3930 	case KEY_RIGHT:
3931 	case 'l':
3932 		if (view->x + view->ncols / 2 < view->maxx)
3933 			view->x += 2;
3934 		else
3935 			view->count = 0;
3936 		break;
3937 	case '0':
3938 		view->x = 0;
3939 		break;
3940 	case '$':
3941 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3942 		view->count = 0;
3943 		break;
3944 	default:
3945 		break;
3946 	}
3947 }
3948 
3949 static const struct got_error *
3950 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3951 {
3952 	const struct got_error *err = NULL;
3953 	struct tog_log_view_state *s = &view->state.log;
3954 	int eos, nscroll;
3955 
3956 	if (s->thread_args.load_all) {
3957 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3958 			s->thread_args.load_all = 0;
3959 		else if (s->thread_args.log_complete) {
3960 			err = log_move_cursor_down(view, s->commits->ncommits);
3961 			s->thread_args.load_all = 0;
3962 		}
3963 		if (err)
3964 			return err;
3965 	}
3966 
3967 	eos = nscroll = view->nlines - 1;
3968 	if (view_is_hsplit_top(view))
3969 		--eos;  /* border */
3970 
3971 	if (view->gline)
3972 		return log_goto_line(view, eos);
3973 
3974 	switch (ch) {
3975 	case '&':
3976 		err = limit_log_view(view);
3977 		break;
3978 	case 'q':
3979 		s->quit = 1;
3980 		break;
3981 	case '0':
3982 	case '$':
3983 	case KEY_RIGHT:
3984 	case 'l':
3985 	case KEY_LEFT:
3986 	case 'h':
3987 		horizontal_scroll_input(view, ch);
3988 		break;
3989 	case 'k':
3990 	case KEY_UP:
3991 	case '<':
3992 	case ',':
3993 	case CTRL('p'):
3994 		log_move_cursor_up(view, 0, 0);
3995 		break;
3996 	case 'g':
3997 	case '=':
3998 	case KEY_HOME:
3999 		log_move_cursor_up(view, 0, 1);
4000 		view->count = 0;
4001 		break;
4002 	case CTRL('u'):
4003 	case 'u':
4004 		nscroll /= 2;
4005 		/* FALL THROUGH */
4006 	case KEY_PPAGE:
4007 	case CTRL('b'):
4008 	case 'b':
4009 		log_move_cursor_up(view, nscroll, 0);
4010 		break;
4011 	case 'j':
4012 	case KEY_DOWN:
4013 	case '>':
4014 	case '.':
4015 	case CTRL('n'):
4016 		err = log_move_cursor_down(view, 0);
4017 		break;
4018 	case '@':
4019 		s->use_committer = !s->use_committer;
4020 		view->action = s->use_committer ?
4021 		    "show committer" : "show commit author";
4022 		break;
4023 	case 'G':
4024 	case '*':
4025 	case KEY_END: {
4026 		/* We don't know yet how many commits, so we're forced to
4027 		 * traverse them all. */
4028 		view->count = 0;
4029 		s->thread_args.load_all = 1;
4030 		if (!s->thread_args.log_complete)
4031 			return trigger_log_thread(view, 0);
4032 		err = log_move_cursor_down(view, s->commits->ncommits);
4033 		s->thread_args.load_all = 0;
4034 		break;
4035 	}
4036 	case CTRL('d'):
4037 	case 'd':
4038 		nscroll /= 2;
4039 		/* FALL THROUGH */
4040 	case KEY_NPAGE:
4041 	case CTRL('f'):
4042 	case 'f':
4043 	case ' ':
4044 		err = log_move_cursor_down(view, nscroll);
4045 		break;
4046 	case KEY_RESIZE:
4047 		if (s->selected > view->nlines - 2)
4048 			s->selected = view->nlines - 2;
4049 		if (s->selected > s->commits->ncommits - 1)
4050 			s->selected = s->commits->ncommits - 1;
4051 		select_commit(s);
4052 		if (s->commits->ncommits < view->nlines - 1 &&
4053 		    !s->thread_args.log_complete) {
4054 			s->thread_args.commits_needed += (view->nlines - 1) -
4055 			    s->commits->ncommits;
4056 			err = trigger_log_thread(view, 1);
4057 		}
4058 		break;
4059 	case KEY_ENTER:
4060 	case '\r':
4061 		view->count = 0;
4062 		if (s->selected_entry == NULL)
4063 			break;
4064 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4065 		break;
4066 	case 'T':
4067 		view->count = 0;
4068 		if (s->selected_entry == NULL)
4069 			break;
4070 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4071 		break;
4072 	case KEY_BACKSPACE:
4073 	case CTRL('l'):
4074 	case 'B':
4075 		view->count = 0;
4076 		if (ch == KEY_BACKSPACE &&
4077 		    got_path_is_root_dir(s->in_repo_path))
4078 			break;
4079 		err = stop_log_thread(s);
4080 		if (err)
4081 			return err;
4082 		if (ch == KEY_BACKSPACE) {
4083 			char *parent_path;
4084 			err = got_path_dirname(&parent_path, s->in_repo_path);
4085 			if (err)
4086 				return err;
4087 			free(s->in_repo_path);
4088 			s->in_repo_path = parent_path;
4089 			s->thread_args.in_repo_path = s->in_repo_path;
4090 		} else if (ch == CTRL('l')) {
4091 			struct got_object_id *start_id;
4092 			err = got_repo_match_object_id(&start_id, NULL,
4093 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4094 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4095 			if (err) {
4096 				if (s->head_ref_name == NULL ||
4097 				    err->code != GOT_ERR_NOT_REF)
4098 					return err;
4099 				/* Try to cope with deleted references. */
4100 				free(s->head_ref_name);
4101 				s->head_ref_name = NULL;
4102 				err = got_repo_match_object_id(&start_id,
4103 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4104 				    &tog_refs, s->repo);
4105 				if (err)
4106 					return err;
4107 			}
4108 			free(s->start_id);
4109 			s->start_id = start_id;
4110 			s->thread_args.start_id = s->start_id;
4111 		} else /* 'B' */
4112 			s->log_branches = !s->log_branches;
4113 
4114 		if (s->thread_args.pack_fds == NULL) {
4115 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4116 			if (err)
4117 				return err;
4118 		}
4119 		err = got_repo_open(&s->thread_args.repo,
4120 		    got_repo_get_path(s->repo), NULL,
4121 		    s->thread_args.pack_fds);
4122 		if (err)
4123 			return err;
4124 		tog_free_refs();
4125 		err = tog_load_refs(s->repo, 0);
4126 		if (err)
4127 			return err;
4128 		err = got_commit_graph_open(&s->thread_args.graph,
4129 		    s->in_repo_path, !s->log_branches);
4130 		if (err)
4131 			return err;
4132 		err = got_commit_graph_iter_start(s->thread_args.graph,
4133 		    s->start_id, s->repo, NULL, NULL);
4134 		if (err)
4135 			return err;
4136 		free_commits(&s->real_commits);
4137 		free_commits(&s->limit_commits);
4138 		s->first_displayed_entry = NULL;
4139 		s->last_displayed_entry = NULL;
4140 		s->selected_entry = NULL;
4141 		s->selected = 0;
4142 		s->thread_args.log_complete = 0;
4143 		s->quit = 0;
4144 		s->thread_args.commits_needed = view->lines;
4145 		s->matched_entry = NULL;
4146 		s->search_entry = NULL;
4147 		view->offset = 0;
4148 		break;
4149 	case 'R':
4150 		view->count = 0;
4151 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4152 		break;
4153 	default:
4154 		view->count = 0;
4155 		break;
4156 	}
4157 
4158 	return err;
4159 }
4160 
4161 static const struct got_error *
4162 apply_unveil(const char *repo_path, const char *worktree_path)
4163 {
4164 	const struct got_error *error;
4165 
4166 #ifdef PROFILE
4167 	if (unveil("gmon.out", "rwc") != 0)
4168 		return got_error_from_errno2("unveil", "gmon.out");
4169 #endif
4170 	if (repo_path && unveil(repo_path, "r") != 0)
4171 		return got_error_from_errno2("unveil", repo_path);
4172 
4173 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4174 		return got_error_from_errno2("unveil", worktree_path);
4175 
4176 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4177 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4178 
4179 	error = got_privsep_unveil_exec_helpers();
4180 	if (error != NULL)
4181 		return error;
4182 
4183 	if (unveil(NULL, NULL) != 0)
4184 		return got_error_from_errno("unveil");
4185 
4186 	return NULL;
4187 }
4188 
4189 static const struct got_error *
4190 init_mock_term(const char *test_script_path)
4191 {
4192 	const struct got_error	*err = NULL;
4193 	const char *screen_dump_path;
4194 	int in;
4195 
4196 	if (test_script_path == NULL || *test_script_path == '\0')
4197 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4198 
4199 	tog_io.f = fopen(test_script_path, "re");
4200 	if (tog_io.f == NULL) {
4201 		err = got_error_from_errno_fmt("fopen: %s",
4202 		    test_script_path);
4203 		goto done;
4204 	}
4205 
4206 	/* test mode, we don't want any output */
4207 	tog_io.cout = fopen("/dev/null", "w+");
4208 	if (tog_io.cout == NULL) {
4209 		err = got_error_from_errno2("fopen", "/dev/null");
4210 		goto done;
4211 	}
4212 
4213 	in = dup(fileno(tog_io.cout));
4214 	if (in == -1) {
4215 		err = got_error_from_errno("dup");
4216 		goto done;
4217 	}
4218 	tog_io.cin = fdopen(in, "r");
4219 	if (tog_io.cin == NULL) {
4220 		err = got_error_from_errno("fdopen");
4221 		close(in);
4222 		goto done;
4223 	}
4224 
4225 	screen_dump_path = getenv("TOG_SCR_DUMP");
4226 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4227 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4228 	tog_io.sdump = fopen(screen_dump_path, "wex");
4229 	if (tog_io.sdump == NULL) {
4230 		err = got_error_from_errno2("fopen", screen_dump_path);
4231 		goto done;
4232 	}
4233 
4234 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4235 		err = got_error_from_errno("fseeko");
4236 		goto done;
4237 	}
4238 
4239 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4240 		err = got_error_msg(GOT_ERR_IO,
4241 		    "newterm: failed to initialise curses");
4242 
4243 	using_mock_io = 1;
4244 
4245 done:
4246 	if (err)
4247 		tog_io_close();
4248 	return err;
4249 }
4250 
4251 static void
4252 init_curses(void)
4253 {
4254 	/*
4255 	 * Override default signal handlers before starting ncurses.
4256 	 * This should prevent ncurses from installing its own
4257 	 * broken cleanup() signal handler.
4258 	 */
4259 	signal(SIGWINCH, tog_sigwinch);
4260 	signal(SIGPIPE, tog_sigpipe);
4261 	signal(SIGCONT, tog_sigcont);
4262 	signal(SIGINT, tog_sigint);
4263 	signal(SIGTERM, tog_sigterm);
4264 
4265 	if (using_mock_io) /* In test mode we use a fake terminal */
4266 		return;
4267 
4268 	initscr();
4269 
4270 	cbreak();
4271 	halfdelay(1); /* Fast refresh while initial view is loading. */
4272 	noecho();
4273 	nonl();
4274 	intrflush(stdscr, FALSE);
4275 	keypad(stdscr, TRUE);
4276 	curs_set(0);
4277 	if (getenv("TOG_COLORS") != NULL) {
4278 		start_color();
4279 		use_default_colors();
4280 	}
4281 
4282 	return;
4283 }
4284 
4285 static const struct got_error *
4286 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4287     struct got_repository *repo, struct got_worktree *worktree)
4288 {
4289 	const struct got_error *err = NULL;
4290 
4291 	if (argc == 0) {
4292 		*in_repo_path = strdup("/");
4293 		if (*in_repo_path == NULL)
4294 			return got_error_from_errno("strdup");
4295 		return NULL;
4296 	}
4297 
4298 	if (worktree) {
4299 		const char *prefix = got_worktree_get_path_prefix(worktree);
4300 		char *p;
4301 
4302 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4303 		if (err)
4304 			return err;
4305 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4306 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4307 		    p) == -1) {
4308 			err = got_error_from_errno("asprintf");
4309 			*in_repo_path = NULL;
4310 		}
4311 		free(p);
4312 	} else
4313 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4314 
4315 	return err;
4316 }
4317 
4318 static const struct got_error *
4319 cmd_log(int argc, char *argv[])
4320 {
4321 	const struct got_error *error;
4322 	struct got_repository *repo = NULL;
4323 	struct got_worktree *worktree = NULL;
4324 	struct got_object_id *start_id = NULL;
4325 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4326 	char *start_commit = NULL, *label = NULL;
4327 	struct got_reference *ref = NULL;
4328 	const char *head_ref_name = NULL;
4329 	int ch, log_branches = 0;
4330 	struct tog_view *view;
4331 	int *pack_fds = NULL;
4332 
4333 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4334 		switch (ch) {
4335 		case 'b':
4336 			log_branches = 1;
4337 			break;
4338 		case 'c':
4339 			start_commit = optarg;
4340 			break;
4341 		case 'r':
4342 			repo_path = realpath(optarg, NULL);
4343 			if (repo_path == NULL)
4344 				return got_error_from_errno2("realpath",
4345 				    optarg);
4346 			break;
4347 		default:
4348 			usage_log();
4349 			/* NOTREACHED */
4350 		}
4351 	}
4352 
4353 	argc -= optind;
4354 	argv += optind;
4355 
4356 	if (argc > 1)
4357 		usage_log();
4358 
4359 	error = got_repo_pack_fds_open(&pack_fds);
4360 	if (error != NULL)
4361 		goto done;
4362 
4363 	if (repo_path == NULL) {
4364 		cwd = getcwd(NULL, 0);
4365 		if (cwd == NULL)
4366 			return got_error_from_errno("getcwd");
4367 		error = got_worktree_open(&worktree, cwd);
4368 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4369 			goto done;
4370 		if (worktree)
4371 			repo_path =
4372 			    strdup(got_worktree_get_repo_path(worktree));
4373 		else
4374 			repo_path = strdup(cwd);
4375 		if (repo_path == NULL) {
4376 			error = got_error_from_errno("strdup");
4377 			goto done;
4378 		}
4379 	}
4380 
4381 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4382 	if (error != NULL)
4383 		goto done;
4384 
4385 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4386 	    repo, worktree);
4387 	if (error)
4388 		goto done;
4389 
4390 	init_curses();
4391 
4392 	error = apply_unveil(got_repo_get_path(repo),
4393 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4394 	if (error)
4395 		goto done;
4396 
4397 	/* already loaded by tog_log_with_path()? */
4398 	if (TAILQ_EMPTY(&tog_refs)) {
4399 		error = tog_load_refs(repo, 0);
4400 		if (error)
4401 			goto done;
4402 	}
4403 
4404 	if (start_commit == NULL) {
4405 		error = got_repo_match_object_id(&start_id, &label,
4406 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4407 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4408 		if (error)
4409 			goto done;
4410 		head_ref_name = label;
4411 	} else {
4412 		error = got_ref_open(&ref, repo, start_commit, 0);
4413 		if (error == NULL)
4414 			head_ref_name = got_ref_get_name(ref);
4415 		else if (error->code != GOT_ERR_NOT_REF)
4416 			goto done;
4417 		error = got_repo_match_object_id(&start_id, NULL,
4418 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4419 		if (error)
4420 			goto done;
4421 	}
4422 
4423 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4424 	if (view == NULL) {
4425 		error = got_error_from_errno("view_open");
4426 		goto done;
4427 	}
4428 	error = open_log_view(view, start_id, repo, head_ref_name,
4429 	    in_repo_path, log_branches);
4430 	if (error)
4431 		goto done;
4432 	if (worktree) {
4433 		/* Release work tree lock. */
4434 		got_worktree_close(worktree);
4435 		worktree = NULL;
4436 	}
4437 	error = view_loop(view);
4438 done:
4439 	free(in_repo_path);
4440 	free(repo_path);
4441 	free(cwd);
4442 	free(start_id);
4443 	free(label);
4444 	if (ref)
4445 		got_ref_close(ref);
4446 	if (repo) {
4447 		const struct got_error *close_err = got_repo_close(repo);
4448 		if (error == NULL)
4449 			error = close_err;
4450 	}
4451 	if (worktree)
4452 		got_worktree_close(worktree);
4453 	if (pack_fds) {
4454 		const struct got_error *pack_err =
4455 		    got_repo_pack_fds_close(pack_fds);
4456 		if (error == NULL)
4457 			error = pack_err;
4458 	}
4459 	tog_free_refs();
4460 	return error;
4461 }
4462 
4463 __dead static void
4464 usage_diff(void)
4465 {
4466 	endwin();
4467 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4468 	    "object1 object2\n", getprogname());
4469 	exit(1);
4470 }
4471 
4472 static int
4473 match_line(const char *line, regex_t *regex, size_t nmatch,
4474     regmatch_t *regmatch)
4475 {
4476 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4477 }
4478 
4479 static struct tog_color *
4480 match_color(struct tog_colors *colors, const char *line)
4481 {
4482 	struct tog_color *tc = NULL;
4483 
4484 	STAILQ_FOREACH(tc, colors, entry) {
4485 		if (match_line(line, &tc->regex, 0, NULL))
4486 			return tc;
4487 	}
4488 
4489 	return NULL;
4490 }
4491 
4492 static const struct got_error *
4493 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4494     WINDOW *window, int skipcol, regmatch_t *regmatch)
4495 {
4496 	const struct got_error *err = NULL;
4497 	char *exstr = NULL;
4498 	wchar_t *wline = NULL;
4499 	int rme, rms, n, width, scrollx;
4500 	int width0 = 0, width1 = 0, width2 = 0;
4501 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4502 
4503 	*wtotal = 0;
4504 
4505 	rms = regmatch->rm_so;
4506 	rme = regmatch->rm_eo;
4507 
4508 	err = expand_tab(&exstr, line);
4509 	if (err)
4510 		return err;
4511 
4512 	/* Split the line into 3 segments, according to match offsets. */
4513 	seg0 = strndup(exstr, rms);
4514 	if (seg0 == NULL) {
4515 		err = got_error_from_errno("strndup");
4516 		goto done;
4517 	}
4518 	seg1 = strndup(exstr + rms, rme - rms);
4519 	if (seg1 == NULL) {
4520 		err = got_error_from_errno("strndup");
4521 		goto done;
4522 	}
4523 	seg2 = strdup(exstr + rme);
4524 	if (seg2 == NULL) {
4525 		err = got_error_from_errno("strndup");
4526 		goto done;
4527 	}
4528 
4529 	/* draw up to matched token if we haven't scrolled past it */
4530 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4531 	    col_tab_align, 1);
4532 	if (err)
4533 		goto done;
4534 	n = MAX(width0 - skipcol, 0);
4535 	if (n) {
4536 		free(wline);
4537 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4538 		    wlimit, col_tab_align, 1);
4539 		if (err)
4540 			goto done;
4541 		waddwstr(window, &wline[scrollx]);
4542 		wlimit -= width;
4543 		*wtotal += width;
4544 	}
4545 
4546 	if (wlimit > 0) {
4547 		int i = 0, w = 0;
4548 		size_t wlen;
4549 
4550 		free(wline);
4551 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4552 		    col_tab_align, 1);
4553 		if (err)
4554 			goto done;
4555 		wlen = wcslen(wline);
4556 		while (i < wlen) {
4557 			width = wcwidth(wline[i]);
4558 			if (width == -1) {
4559 				/* should not happen, tabs are expanded */
4560 				err = got_error(GOT_ERR_RANGE);
4561 				goto done;
4562 			}
4563 			if (width0 + w + width > skipcol)
4564 				break;
4565 			w += width;
4566 			i++;
4567 		}
4568 		/* draw (visible part of) matched token (if scrolled into it) */
4569 		if (width1 - w > 0) {
4570 			wattron(window, A_STANDOUT);
4571 			waddwstr(window, &wline[i]);
4572 			wattroff(window, A_STANDOUT);
4573 			wlimit -= (width1 - w);
4574 			*wtotal += (width1 - w);
4575 		}
4576 	}
4577 
4578 	if (wlimit > 0) {  /* draw rest of line */
4579 		free(wline);
4580 		if (skipcol > width0 + width1) {
4581 			err = format_line(&wline, &width2, &scrollx, seg2,
4582 			    skipcol - (width0 + width1), wlimit,
4583 			    col_tab_align, 1);
4584 			if (err)
4585 				goto done;
4586 			waddwstr(window, &wline[scrollx]);
4587 		} else {
4588 			err = format_line(&wline, &width2, NULL, seg2, 0,
4589 			    wlimit, col_tab_align, 1);
4590 			if (err)
4591 				goto done;
4592 			waddwstr(window, wline);
4593 		}
4594 		*wtotal += width2;
4595 	}
4596 done:
4597 	free(wline);
4598 	free(exstr);
4599 	free(seg0);
4600 	free(seg1);
4601 	free(seg2);
4602 	return err;
4603 }
4604 
4605 static int
4606 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4607 {
4608 	FILE	*f = NULL;
4609 	int	*eof, *first, *selected;
4610 
4611 	if (view->type == TOG_VIEW_DIFF) {
4612 		struct tog_diff_view_state *s = &view->state.diff;
4613 
4614 		first = &s->first_displayed_line;
4615 		selected = first;
4616 		eof = &s->eof;
4617 		f = s->f;
4618 	} else if (view->type == TOG_VIEW_HELP) {
4619 		struct tog_help_view_state *s = &view->state.help;
4620 
4621 		first = &s->first_displayed_line;
4622 		selected = first;
4623 		eof = &s->eof;
4624 		f = s->f;
4625 	} else if (view->type == TOG_VIEW_BLAME) {
4626 		struct tog_blame_view_state *s = &view->state.blame;
4627 
4628 		first = &s->first_displayed_line;
4629 		selected = &s->selected_line;
4630 		eof = &s->eof;
4631 		f = s->blame.f;
4632 	} else
4633 		return 0;
4634 
4635 	/* Center gline in the middle of the page like vi(1). */
4636 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4637 		return 0;
4638 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4639 		rewind(f);
4640 		*eof = 0;
4641 		*first = 1;
4642 		*lineno = 0;
4643 		*nprinted = 0;
4644 		return 0;
4645 	}
4646 
4647 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4648 		view->gline : (view->nlines - 3) / 2 + 1;
4649 	view->gline = 0;
4650 
4651 	return 1;
4652 }
4653 
4654 static const struct got_error *
4655 draw_file(struct tog_view *view, const char *header)
4656 {
4657 	struct tog_diff_view_state *s = &view->state.diff;
4658 	regmatch_t *regmatch = &view->regmatch;
4659 	const struct got_error *err;
4660 	int nprinted = 0;
4661 	char *line;
4662 	size_t linesize = 0;
4663 	ssize_t linelen;
4664 	wchar_t *wline;
4665 	int width;
4666 	int max_lines = view->nlines;
4667 	int nlines = s->nlines;
4668 	off_t line_offset;
4669 
4670 	s->lineno = s->first_displayed_line - 1;
4671 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4672 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4673 		return got_error_from_errno("fseek");
4674 
4675 	werase(view->window);
4676 
4677 	if (view->gline > s->nlines - 1)
4678 		view->gline = s->nlines - 1;
4679 
4680 	if (header) {
4681 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4682 		    1 : view->gline - (view->nlines - 3) / 2 :
4683 		    s->lineno + s->selected_line;
4684 
4685 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4686 			return got_error_from_errno("asprintf");
4687 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4688 		    0, 0);
4689 		free(line);
4690 		if (err)
4691 			return err;
4692 
4693 		if (view_needs_focus_indication(view))
4694 			wstandout(view->window);
4695 		waddwstr(view->window, wline);
4696 		free(wline);
4697 		wline = NULL;
4698 		while (width++ < view->ncols)
4699 			waddch(view->window, ' ');
4700 		if (view_needs_focus_indication(view))
4701 			wstandend(view->window);
4702 
4703 		if (max_lines <= 1)
4704 			return NULL;
4705 		max_lines--;
4706 	}
4707 
4708 	s->eof = 0;
4709 	view->maxx = 0;
4710 	line = NULL;
4711 	while (max_lines > 0 && nprinted < max_lines) {
4712 		enum got_diff_line_type linetype;
4713 		attr_t attr = 0;
4714 
4715 		linelen = getline(&line, &linesize, s->f);
4716 		if (linelen == -1) {
4717 			if (feof(s->f)) {
4718 				s->eof = 1;
4719 				break;
4720 			}
4721 			free(line);
4722 			return got_ferror(s->f, GOT_ERR_IO);
4723 		}
4724 
4725 		if (++s->lineno < s->first_displayed_line)
4726 			continue;
4727 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4728 			continue;
4729 		if (s->lineno == view->hiline)
4730 			attr = A_STANDOUT;
4731 
4732 		/* Set view->maxx based on full line length. */
4733 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4734 		    view->x ? 1 : 0);
4735 		if (err) {
4736 			free(line);
4737 			return err;
4738 		}
4739 		view->maxx = MAX(view->maxx, width);
4740 		free(wline);
4741 		wline = NULL;
4742 
4743 		linetype = s->lines[s->lineno].type;
4744 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4745 		    linetype < GOT_DIFF_LINE_CONTEXT)
4746 			attr |= COLOR_PAIR(linetype);
4747 		if (attr)
4748 			wattron(view->window, attr);
4749 		if (s->first_displayed_line + nprinted == s->matched_line &&
4750 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4751 			err = add_matched_line(&width, line, view->ncols, 0,
4752 			    view->window, view->x, regmatch);
4753 			if (err) {
4754 				free(line);
4755 				return err;
4756 			}
4757 		} else {
4758 			int skip;
4759 			err = format_line(&wline, &width, &skip, line,
4760 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4761 			if (err) {
4762 				free(line);
4763 				return err;
4764 			}
4765 			waddwstr(view->window, &wline[skip]);
4766 			free(wline);
4767 			wline = NULL;
4768 		}
4769 		if (s->lineno == view->hiline) {
4770 			/* highlight full gline length */
4771 			while (width++ < view->ncols)
4772 				waddch(view->window, ' ');
4773 		} else {
4774 			if (width <= view->ncols - 1)
4775 				waddch(view->window, '\n');
4776 		}
4777 		if (attr)
4778 			wattroff(view->window, attr);
4779 		if (++nprinted == 1)
4780 			s->first_displayed_line = s->lineno;
4781 	}
4782 	free(line);
4783 	if (nprinted >= 1)
4784 		s->last_displayed_line = s->first_displayed_line +
4785 		    (nprinted - 1);
4786 	else
4787 		s->last_displayed_line = s->first_displayed_line;
4788 
4789 	view_border(view);
4790 
4791 	if (s->eof) {
4792 		while (nprinted < view->nlines) {
4793 			waddch(view->window, '\n');
4794 			nprinted++;
4795 		}
4796 
4797 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4798 		    view->ncols, 0, 0);
4799 		if (err) {
4800 			return err;
4801 		}
4802 
4803 		wstandout(view->window);
4804 		waddwstr(view->window, wline);
4805 		free(wline);
4806 		wline = NULL;
4807 		wstandend(view->window);
4808 	}
4809 
4810 	return NULL;
4811 }
4812 
4813 static char *
4814 get_datestr(time_t *time, char *datebuf)
4815 {
4816 	struct tm mytm, *tm;
4817 	char *p, *s;
4818 
4819 	tm = gmtime_r(time, &mytm);
4820 	if (tm == NULL)
4821 		return NULL;
4822 	s = asctime_r(tm, datebuf);
4823 	if (s == NULL)
4824 		return NULL;
4825 	p = strchr(s, '\n');
4826 	if (p)
4827 		*p = '\0';
4828 	return s;
4829 }
4830 
4831 static const struct got_error *
4832 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4833     off_t off, uint8_t type)
4834 {
4835 	struct got_diff_line *p;
4836 
4837 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4838 	if (p == NULL)
4839 		return got_error_from_errno("reallocarray");
4840 	*lines = p;
4841 	(*lines)[*nlines].offset = off;
4842 	(*lines)[*nlines].type = type;
4843 	(*nlines)++;
4844 
4845 	return NULL;
4846 }
4847 
4848 static const struct got_error *
4849 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4850     struct got_diff_line *s_lines, size_t s_nlines)
4851 {
4852 	struct got_diff_line	*p;
4853 	char			 buf[BUFSIZ];
4854 	size_t			 i, r;
4855 
4856 	if (fseeko(src, 0L, SEEK_SET) == -1)
4857 		return got_error_from_errno("fseeko");
4858 
4859 	for (;;) {
4860 		r = fread(buf, 1, sizeof(buf), src);
4861 		if (r == 0) {
4862 			if (ferror(src))
4863 				return got_error_from_errno("fread");
4864 			if (feof(src))
4865 				break;
4866 		}
4867 		if (fwrite(buf, 1, r, dst) != r)
4868 			return got_ferror(dst, GOT_ERR_IO);
4869 	}
4870 
4871 	if (s_nlines == 0 && *d_nlines == 0)
4872 		return NULL;
4873 
4874 	/*
4875 	 * If commit info was in dst, increment line offsets
4876 	 * of the appended diff content, but skip s_lines[0]
4877 	 * because offset zero is already in *d_lines.
4878 	 */
4879 	if (*d_nlines > 0) {
4880 		for (i = 1; i < s_nlines; ++i)
4881 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4882 
4883 		if (s_nlines > 0) {
4884 			--s_nlines;
4885 			++s_lines;
4886 		}
4887 	}
4888 
4889 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4890 	if (p == NULL) {
4891 		/* d_lines is freed in close_diff_view() */
4892 		return got_error_from_errno("reallocarray");
4893 	}
4894 
4895 	*d_lines = p;
4896 
4897 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4898 	*d_nlines += s_nlines;
4899 
4900 	return NULL;
4901 }
4902 
4903 static const struct got_error *
4904 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4905     struct got_object_id *commit_id, struct got_reflist_head *refs,
4906     struct got_repository *repo, int ignore_ws, int force_text_diff,
4907     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4908 {
4909 	const struct got_error *err = NULL;
4910 	char datebuf[26], *datestr;
4911 	struct got_commit_object *commit;
4912 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4913 	time_t committer_time;
4914 	const char *author, *committer;
4915 	char *refs_str = NULL;
4916 	struct got_pathlist_entry *pe;
4917 	off_t outoff = 0;
4918 	int n;
4919 
4920 	if (refs) {
4921 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4922 		if (err)
4923 			return err;
4924 	}
4925 
4926 	err = got_object_open_as_commit(&commit, repo, commit_id);
4927 	if (err)
4928 		return err;
4929 
4930 	err = got_object_id_str(&id_str, commit_id);
4931 	if (err) {
4932 		err = got_error_from_errno("got_object_id_str");
4933 		goto done;
4934 	}
4935 
4936 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4937 	if (err)
4938 		goto done;
4939 
4940 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4941 	    refs_str ? refs_str : "", refs_str ? ")" : "");
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, GOT_DIFF_LINE_META);
4948 	if (err)
4949 		goto done;
4950 
4951 	n = fprintf(outfile, "from: %s\n",
4952 	    got_object_commit_get_author(commit));
4953 	if (n < 0) {
4954 		err = got_error_from_errno("fprintf");
4955 		goto done;
4956 	}
4957 	outoff += n;
4958 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4959 	if (err)
4960 		goto done;
4961 
4962 	author = got_object_commit_get_author(commit);
4963 	committer = got_object_commit_get_committer(commit);
4964 	if (strcmp(author, committer) != 0) {
4965 		n = fprintf(outfile, "via: %s\n", committer);
4966 		if (n < 0) {
4967 			err = got_error_from_errno("fprintf");
4968 			goto done;
4969 		}
4970 		outoff += n;
4971 		err = add_line_metadata(lines, nlines, outoff,
4972 		    GOT_DIFF_LINE_AUTHOR);
4973 		if (err)
4974 			goto done;
4975 	}
4976 	committer_time = got_object_commit_get_committer_time(commit);
4977 	datestr = get_datestr(&committer_time, datebuf);
4978 	if (datestr) {
4979 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4980 		if (n < 0) {
4981 			err = got_error_from_errno("fprintf");
4982 			goto done;
4983 		}
4984 		outoff += n;
4985 		err = add_line_metadata(lines, nlines, outoff,
4986 		    GOT_DIFF_LINE_DATE);
4987 		if (err)
4988 			goto done;
4989 	}
4990 	if (got_object_commit_get_nparents(commit) > 1) {
4991 		const struct got_object_id_queue *parent_ids;
4992 		struct got_object_qid *qid;
4993 		int pn = 1;
4994 		parent_ids = got_object_commit_get_parent_ids(commit);
4995 		STAILQ_FOREACH(qid, parent_ids, entry) {
4996 			err = got_object_id_str(&id_str, &qid->id);
4997 			if (err)
4998 				goto done;
4999 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
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_META);
5007 			if (err)
5008 				goto done;
5009 			free(id_str);
5010 			id_str = NULL;
5011 		}
5012 	}
5013 
5014 	err = got_object_commit_get_logmsg(&logmsg, commit);
5015 	if (err)
5016 		goto done;
5017 	s = logmsg;
5018 	while ((line = strsep(&s, "\n")) != NULL) {
5019 		n = fprintf(outfile, "%s\n", line);
5020 		if (n < 0) {
5021 			err = got_error_from_errno("fprintf");
5022 			goto done;
5023 		}
5024 		outoff += n;
5025 		err = add_line_metadata(lines, nlines, outoff,
5026 		    GOT_DIFF_LINE_LOGMSG);
5027 		if (err)
5028 			goto done;
5029 	}
5030 
5031 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5032 		struct got_diff_changed_path *cp = pe->data;
5033 		int pad = dsa->max_path_len - pe->path_len + 1;
5034 
5035 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5036 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5037 		    dsa->rm_cols + 1, cp->rm);
5038 		if (n < 0) {
5039 			err = got_error_from_errno("fprintf");
5040 			goto done;
5041 		}
5042 		outoff += n;
5043 		err = add_line_metadata(lines, nlines, outoff,
5044 		    GOT_DIFF_LINE_CHANGES);
5045 		if (err)
5046 			goto done;
5047 	}
5048 
5049 	fputc('\n', outfile);
5050 	outoff++;
5051 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5052 	if (err)
5053 		goto done;
5054 
5055 	n = fprintf(outfile,
5056 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5057 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5058 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5059 	if (n < 0) {
5060 		err = got_error_from_errno("fprintf");
5061 		goto done;
5062 	}
5063 	outoff += n;
5064 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5065 	if (err)
5066 		goto done;
5067 
5068 	fputc('\n', outfile);
5069 	outoff++;
5070 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5071 done:
5072 	free(id_str);
5073 	free(logmsg);
5074 	free(refs_str);
5075 	got_object_commit_close(commit);
5076 	if (err) {
5077 		free(*lines);
5078 		*lines = NULL;
5079 		*nlines = 0;
5080 	}
5081 	return err;
5082 }
5083 
5084 static const struct got_error *
5085 create_diff(struct tog_diff_view_state *s)
5086 {
5087 	const struct got_error *err = NULL;
5088 	FILE *f = NULL, *tmp_diff_file = NULL;
5089 	int obj_type;
5090 	struct got_diff_line *lines = NULL;
5091 	struct got_pathlist_head changed_paths;
5092 
5093 	TAILQ_INIT(&changed_paths);
5094 
5095 	free(s->lines);
5096 	s->lines = malloc(sizeof(*s->lines));
5097 	if (s->lines == NULL)
5098 		return got_error_from_errno("malloc");
5099 	s->nlines = 0;
5100 
5101 	f = got_opentemp();
5102 	if (f == NULL) {
5103 		err = got_error_from_errno("got_opentemp");
5104 		goto done;
5105 	}
5106 	tmp_diff_file = got_opentemp();
5107 	if (tmp_diff_file == NULL) {
5108 		err = got_error_from_errno("got_opentemp");
5109 		goto done;
5110 	}
5111 	if (s->f && fclose(s->f) == EOF) {
5112 		err = got_error_from_errno("fclose");
5113 		goto done;
5114 	}
5115 	s->f = f;
5116 
5117 	if (s->id1)
5118 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5119 	else
5120 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5121 	if (err)
5122 		goto done;
5123 
5124 	switch (obj_type) {
5125 	case GOT_OBJ_TYPE_BLOB:
5126 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5127 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5128 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5129 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5130 		    s->f);
5131 		break;
5132 	case GOT_OBJ_TYPE_TREE:
5133 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5134 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5135 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5136 		    s->force_text_diff, NULL, s->repo, s->f);
5137 		break;
5138 	case GOT_OBJ_TYPE_COMMIT: {
5139 		const struct got_object_id_queue *parent_ids;
5140 		struct got_object_qid *pid;
5141 		struct got_commit_object *commit2;
5142 		struct got_reflist_head *refs;
5143 		size_t nlines = 0;
5144 		struct got_diffstat_cb_arg dsa = {
5145 			0, 0, 0, 0, 0, 0,
5146 			&changed_paths,
5147 			s->ignore_whitespace,
5148 			s->force_text_diff,
5149 			tog_diff_algo
5150 		};
5151 
5152 		lines = malloc(sizeof(*lines));
5153 		if (lines == NULL) {
5154 			err = got_error_from_errno("malloc");
5155 			goto done;
5156 		}
5157 
5158 		/* build diff first in tmp file then append to commit info */
5159 		err = got_diff_objects_as_commits(&lines, &nlines,
5160 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5161 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5162 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5163 		if (err)
5164 			break;
5165 
5166 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5167 		if (err)
5168 			goto done;
5169 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5170 		/* Show commit info if we're diffing to a parent/root commit. */
5171 		if (s->id1 == NULL) {
5172 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5173 			    refs, s->repo, s->ignore_whitespace,
5174 			    s->force_text_diff, &dsa, s->f);
5175 			if (err)
5176 				goto done;
5177 		} else {
5178 			parent_ids = got_object_commit_get_parent_ids(commit2);
5179 			STAILQ_FOREACH(pid, parent_ids, entry) {
5180 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5181 					err = write_commit_info(&s->lines,
5182 					    &s->nlines, s->id2, refs, s->repo,
5183 					    s->ignore_whitespace,
5184 					    s->force_text_diff, &dsa, s->f);
5185 					if (err)
5186 						goto done;
5187 					break;
5188 				}
5189 			}
5190 		}
5191 		got_object_commit_close(commit2);
5192 
5193 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5194 		    lines, nlines);
5195 		break;
5196 	}
5197 	default:
5198 		err = got_error(GOT_ERR_OBJ_TYPE);
5199 		break;
5200 	}
5201 done:
5202 	free(lines);
5203 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5204 	if (s->f && fflush(s->f) != 0 && err == NULL)
5205 		err = got_error_from_errno("fflush");
5206 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5207 		err = got_error_from_errno("fclose");
5208 	return err;
5209 }
5210 
5211 static void
5212 diff_view_indicate_progress(struct tog_view *view)
5213 {
5214 	mvwaddstr(view->window, 0, 0, "diffing...");
5215 	update_panels();
5216 	doupdate();
5217 }
5218 
5219 static const struct got_error *
5220 search_start_diff_view(struct tog_view *view)
5221 {
5222 	struct tog_diff_view_state *s = &view->state.diff;
5223 
5224 	s->matched_line = 0;
5225 	return NULL;
5226 }
5227 
5228 static void
5229 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5230     size_t *nlines, int **first, int **last, int **match, int **selected)
5231 {
5232 	struct tog_diff_view_state *s = &view->state.diff;
5233 
5234 	*f = s->f;
5235 	*nlines = s->nlines;
5236 	*line_offsets = NULL;
5237 	*match = &s->matched_line;
5238 	*first = &s->first_displayed_line;
5239 	*last = &s->last_displayed_line;
5240 	*selected = &s->selected_line;
5241 }
5242 
5243 static const struct got_error *
5244 search_next_view_match(struct tog_view *view)
5245 {
5246 	const struct got_error *err = NULL;
5247 	FILE *f;
5248 	int lineno;
5249 	char *line = NULL;
5250 	size_t linesize = 0;
5251 	ssize_t linelen;
5252 	off_t *line_offsets;
5253 	size_t nlines = 0;
5254 	int *first, *last, *match, *selected;
5255 
5256 	if (!view->search_setup)
5257 		return got_error_msg(GOT_ERR_NOT_IMPL,
5258 		    "view search not supported");
5259 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5260 	    &match, &selected);
5261 
5262 	if (!view->searching) {
5263 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5264 		return NULL;
5265 	}
5266 
5267 	if (*match) {
5268 		if (view->searching == TOG_SEARCH_FORWARD)
5269 			lineno = *first + 1;
5270 		else
5271 			lineno = *first - 1;
5272 	} else
5273 		lineno = *first - 1 + *selected;
5274 
5275 	while (1) {
5276 		off_t offset;
5277 
5278 		if (lineno <= 0 || lineno > nlines) {
5279 			if (*match == 0) {
5280 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5281 				break;
5282 			}
5283 
5284 			if (view->searching == TOG_SEARCH_FORWARD)
5285 				lineno = 1;
5286 			else
5287 				lineno = nlines;
5288 		}
5289 
5290 		offset = view->type == TOG_VIEW_DIFF ?
5291 		    view->state.diff.lines[lineno - 1].offset :
5292 		    line_offsets[lineno - 1];
5293 		if (fseeko(f, offset, SEEK_SET) != 0) {
5294 			free(line);
5295 			return got_error_from_errno("fseeko");
5296 		}
5297 		linelen = getline(&line, &linesize, f);
5298 		if (linelen != -1) {
5299 			char *exstr;
5300 			err = expand_tab(&exstr, line);
5301 			if (err)
5302 				break;
5303 			if (match_line(exstr, &view->regex, 1,
5304 			    &view->regmatch)) {
5305 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5306 				*match = lineno;
5307 				free(exstr);
5308 				break;
5309 			}
5310 			free(exstr);
5311 		}
5312 		if (view->searching == TOG_SEARCH_FORWARD)
5313 			lineno++;
5314 		else
5315 			lineno--;
5316 	}
5317 	free(line);
5318 
5319 	if (*match) {
5320 		*first = *match;
5321 		*selected = 1;
5322 	}
5323 
5324 	return err;
5325 }
5326 
5327 static const struct got_error *
5328 close_diff_view(struct tog_view *view)
5329 {
5330 	const struct got_error *err = NULL;
5331 	struct tog_diff_view_state *s = &view->state.diff;
5332 
5333 	free(s->id1);
5334 	s->id1 = NULL;
5335 	free(s->id2);
5336 	s->id2 = NULL;
5337 	if (s->f && fclose(s->f) == EOF)
5338 		err = got_error_from_errno("fclose");
5339 	s->f = NULL;
5340 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5341 		err = got_error_from_errno("fclose");
5342 	s->f1 = NULL;
5343 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5344 		err = got_error_from_errno("fclose");
5345 	s->f2 = NULL;
5346 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5347 		err = got_error_from_errno("close");
5348 	s->fd1 = -1;
5349 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5350 		err = got_error_from_errno("close");
5351 	s->fd2 = -1;
5352 	free(s->lines);
5353 	s->lines = NULL;
5354 	s->nlines = 0;
5355 	return err;
5356 }
5357 
5358 static const struct got_error *
5359 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5360     struct got_object_id *id2, const char *label1, const char *label2,
5361     int diff_context, int ignore_whitespace, int force_text_diff,
5362     struct tog_view *parent_view, struct got_repository *repo)
5363 {
5364 	const struct got_error *err;
5365 	struct tog_diff_view_state *s = &view->state.diff;
5366 
5367 	memset(s, 0, sizeof(*s));
5368 	s->fd1 = -1;
5369 	s->fd2 = -1;
5370 
5371 	if (id1 != NULL && id2 != NULL) {
5372 		int type1, type2;
5373 
5374 		err = got_object_get_type(&type1, repo, id1);
5375 		if (err)
5376 			goto done;
5377 		err = got_object_get_type(&type2, repo, id2);
5378 		if (err)
5379 			goto done;
5380 
5381 		if (type1 != type2) {
5382 			err = got_error(GOT_ERR_OBJ_TYPE);
5383 			goto done;
5384 		}
5385 	}
5386 	s->first_displayed_line = 1;
5387 	s->last_displayed_line = view->nlines;
5388 	s->selected_line = 1;
5389 	s->repo = repo;
5390 	s->id1 = id1;
5391 	s->id2 = id2;
5392 	s->label1 = label1;
5393 	s->label2 = label2;
5394 
5395 	if (id1) {
5396 		s->id1 = got_object_id_dup(id1);
5397 		if (s->id1 == NULL) {
5398 			err = got_error_from_errno("got_object_id_dup");
5399 			goto done;
5400 		}
5401 	} else
5402 		s->id1 = NULL;
5403 
5404 	s->id2 = got_object_id_dup(id2);
5405 	if (s->id2 == NULL) {
5406 		err = got_error_from_errno("got_object_id_dup");
5407 		goto done;
5408 	}
5409 
5410 	s->f1 = got_opentemp();
5411 	if (s->f1 == NULL) {
5412 		err = got_error_from_errno("got_opentemp");
5413 		goto done;
5414 	}
5415 
5416 	s->f2 = got_opentemp();
5417 	if (s->f2 == NULL) {
5418 		err = got_error_from_errno("got_opentemp");
5419 		goto done;
5420 	}
5421 
5422 	s->fd1 = got_opentempfd();
5423 	if (s->fd1 == -1) {
5424 		err = got_error_from_errno("got_opentempfd");
5425 		goto done;
5426 	}
5427 
5428 	s->fd2 = got_opentempfd();
5429 	if (s->fd2 == -1) {
5430 		err = got_error_from_errno("got_opentempfd");
5431 		goto done;
5432 	}
5433 
5434 	s->diff_context = diff_context;
5435 	s->ignore_whitespace = ignore_whitespace;
5436 	s->force_text_diff = force_text_diff;
5437 	s->parent_view = parent_view;
5438 	s->repo = repo;
5439 
5440 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5441 		int rc;
5442 
5443 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5444 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5445 		if (rc != ERR)
5446 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5447 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5448 		if (rc != ERR)
5449 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5450 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5451 		if (rc != ERR)
5452 			rc = init_pair(GOT_DIFF_LINE_META,
5453 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5454 		if (rc != ERR)
5455 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5456 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5457 		if (rc != ERR)
5458 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5459 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5460 		if (rc != ERR)
5461 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5462 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5463 		if (rc != ERR)
5464 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5465 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5466 		if (rc != ERR)
5467 			rc = init_pair(GOT_DIFF_LINE_DATE,
5468 			    get_color_value("TOG_COLOR_DATE"), -1);
5469 		if (rc == ERR) {
5470 			err = got_error(GOT_ERR_RANGE);
5471 			goto done;
5472 		}
5473 	}
5474 
5475 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5476 	    view_is_splitscreen(view))
5477 		show_log_view(parent_view); /* draw border */
5478 	diff_view_indicate_progress(view);
5479 
5480 	err = create_diff(s);
5481 
5482 	view->show = show_diff_view;
5483 	view->input = input_diff_view;
5484 	view->reset = reset_diff_view;
5485 	view->close = close_diff_view;
5486 	view->search_start = search_start_diff_view;
5487 	view->search_setup = search_setup_diff_view;
5488 	view->search_next = search_next_view_match;
5489 done:
5490 	if (err) {
5491 		if (view->close == NULL)
5492 			close_diff_view(view);
5493 		view_close(view);
5494 	}
5495 	return err;
5496 }
5497 
5498 static const struct got_error *
5499 show_diff_view(struct tog_view *view)
5500 {
5501 	const struct got_error *err;
5502 	struct tog_diff_view_state *s = &view->state.diff;
5503 	char *id_str1 = NULL, *id_str2, *header;
5504 	const char *label1, *label2;
5505 
5506 	if (s->id1) {
5507 		err = got_object_id_str(&id_str1, s->id1);
5508 		if (err)
5509 			return err;
5510 		label1 = s->label1 ? s->label1 : id_str1;
5511 	} else
5512 		label1 = "/dev/null";
5513 
5514 	err = got_object_id_str(&id_str2, s->id2);
5515 	if (err)
5516 		return err;
5517 	label2 = s->label2 ? s->label2 : id_str2;
5518 
5519 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5520 		err = got_error_from_errno("asprintf");
5521 		free(id_str1);
5522 		free(id_str2);
5523 		return err;
5524 	}
5525 	free(id_str1);
5526 	free(id_str2);
5527 
5528 	err = draw_file(view, header);
5529 	free(header);
5530 	return err;
5531 }
5532 
5533 static const struct got_error *
5534 set_selected_commit(struct tog_diff_view_state *s,
5535     struct commit_queue_entry *entry)
5536 {
5537 	const struct got_error *err;
5538 	const struct got_object_id_queue *parent_ids;
5539 	struct got_commit_object *selected_commit;
5540 	struct got_object_qid *pid;
5541 
5542 	free(s->id2);
5543 	s->id2 = got_object_id_dup(entry->id);
5544 	if (s->id2 == NULL)
5545 		return got_error_from_errno("got_object_id_dup");
5546 
5547 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5548 	if (err)
5549 		return err;
5550 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5551 	free(s->id1);
5552 	pid = STAILQ_FIRST(parent_ids);
5553 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5554 	got_object_commit_close(selected_commit);
5555 	return NULL;
5556 }
5557 
5558 static const struct got_error *
5559 reset_diff_view(struct tog_view *view)
5560 {
5561 	struct tog_diff_view_state *s = &view->state.diff;
5562 
5563 	view->count = 0;
5564 	wclear(view->window);
5565 	s->first_displayed_line = 1;
5566 	s->last_displayed_line = view->nlines;
5567 	s->matched_line = 0;
5568 	diff_view_indicate_progress(view);
5569 	return create_diff(s);
5570 }
5571 
5572 static void
5573 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5574 {
5575 	int start, i;
5576 
5577 	i = start = s->first_displayed_line - 1;
5578 
5579 	while (s->lines[i].type != type) {
5580 		if (i == 0)
5581 			i = s->nlines - 1;
5582 		if (--i == start)
5583 			return; /* do nothing, requested type not in file */
5584 	}
5585 
5586 	s->selected_line = 1;
5587 	s->first_displayed_line = i;
5588 }
5589 
5590 static void
5591 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5592 {
5593 	int start, i;
5594 
5595 	i = start = s->first_displayed_line + 1;
5596 
5597 	while (s->lines[i].type != type) {
5598 		if (i == s->nlines - 1)
5599 			i = 0;
5600 		if (++i == start)
5601 			return; /* do nothing, requested type not in file */
5602 	}
5603 
5604 	s->selected_line = 1;
5605 	s->first_displayed_line = i;
5606 }
5607 
5608 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5609     int, int, int);
5610 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5611     int, int);
5612 
5613 static const struct got_error *
5614 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5615 {
5616 	const struct got_error *err = NULL;
5617 	struct tog_diff_view_state *s = &view->state.diff;
5618 	struct tog_log_view_state *ls;
5619 	struct commit_queue_entry *old_selected_entry;
5620 	char *line = NULL;
5621 	size_t linesize = 0;
5622 	ssize_t linelen;
5623 	int i, nscroll = view->nlines - 1, up = 0;
5624 
5625 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5626 
5627 	switch (ch) {
5628 	case '0':
5629 	case '$':
5630 	case KEY_RIGHT:
5631 	case 'l':
5632 	case KEY_LEFT:
5633 	case 'h':
5634 		horizontal_scroll_input(view, ch);
5635 		break;
5636 	case 'a':
5637 	case 'w':
5638 		if (ch == 'a') {
5639 			s->force_text_diff = !s->force_text_diff;
5640 			view->action = s->force_text_diff ?
5641 			    "force ASCII text enabled" :
5642 			    "force ASCII text disabled";
5643 		}
5644 		else if (ch == 'w') {
5645 			s->ignore_whitespace = !s->ignore_whitespace;
5646 			view->action = s->ignore_whitespace ?
5647 			    "ignore whitespace enabled" :
5648 			    "ignore whitespace disabled";
5649 		}
5650 		err = reset_diff_view(view);
5651 		break;
5652 	case 'g':
5653 	case KEY_HOME:
5654 		s->first_displayed_line = 1;
5655 		view->count = 0;
5656 		break;
5657 	case 'G':
5658 	case KEY_END:
5659 		view->count = 0;
5660 		if (s->eof)
5661 			break;
5662 
5663 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5664 		s->eof = 1;
5665 		break;
5666 	case 'k':
5667 	case KEY_UP:
5668 	case CTRL('p'):
5669 		if (s->first_displayed_line > 1)
5670 			s->first_displayed_line--;
5671 		else
5672 			view->count = 0;
5673 		break;
5674 	case CTRL('u'):
5675 	case 'u':
5676 		nscroll /= 2;
5677 		/* FALL THROUGH */
5678 	case KEY_PPAGE:
5679 	case CTRL('b'):
5680 	case 'b':
5681 		if (s->first_displayed_line == 1) {
5682 			view->count = 0;
5683 			break;
5684 		}
5685 		i = 0;
5686 		while (i++ < nscroll && s->first_displayed_line > 1)
5687 			s->first_displayed_line--;
5688 		break;
5689 	case 'j':
5690 	case KEY_DOWN:
5691 	case CTRL('n'):
5692 		if (!s->eof)
5693 			s->first_displayed_line++;
5694 		else
5695 			view->count = 0;
5696 		break;
5697 	case CTRL('d'):
5698 	case 'd':
5699 		nscroll /= 2;
5700 		/* FALL THROUGH */
5701 	case KEY_NPAGE:
5702 	case CTRL('f'):
5703 	case 'f':
5704 	case ' ':
5705 		if (s->eof) {
5706 			view->count = 0;
5707 			break;
5708 		}
5709 		i = 0;
5710 		while (!s->eof && i++ < nscroll) {
5711 			linelen = getline(&line, &linesize, s->f);
5712 			s->first_displayed_line++;
5713 			if (linelen == -1) {
5714 				if (feof(s->f)) {
5715 					s->eof = 1;
5716 				} else
5717 					err = got_ferror(s->f, GOT_ERR_IO);
5718 				break;
5719 			}
5720 		}
5721 		free(line);
5722 		break;
5723 	case '(':
5724 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5725 		break;
5726 	case ')':
5727 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5728 		break;
5729 	case '{':
5730 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5731 		break;
5732 	case '}':
5733 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5734 		break;
5735 	case '[':
5736 		if (s->diff_context > 0) {
5737 			s->diff_context--;
5738 			s->matched_line = 0;
5739 			diff_view_indicate_progress(view);
5740 			err = create_diff(s);
5741 			if (s->first_displayed_line + view->nlines - 1 >
5742 			    s->nlines) {
5743 				s->first_displayed_line = 1;
5744 				s->last_displayed_line = view->nlines;
5745 			}
5746 		} else
5747 			view->count = 0;
5748 		break;
5749 	case ']':
5750 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5751 			s->diff_context++;
5752 			s->matched_line = 0;
5753 			diff_view_indicate_progress(view);
5754 			err = create_diff(s);
5755 		} else
5756 			view->count = 0;
5757 		break;
5758 	case '<':
5759 	case ',':
5760 	case 'K':
5761 		up = 1;
5762 		/* FALL THROUGH */
5763 	case '>':
5764 	case '.':
5765 	case 'J':
5766 		if (s->parent_view == NULL) {
5767 			view->count = 0;
5768 			break;
5769 		}
5770 		s->parent_view->count = view->count;
5771 
5772 		if (s->parent_view->type == TOG_VIEW_LOG) {
5773 			ls = &s->parent_view->state.log;
5774 			old_selected_entry = ls->selected_entry;
5775 
5776 			err = input_log_view(NULL, s->parent_view,
5777 			    up ? KEY_UP : KEY_DOWN);
5778 			if (err)
5779 				break;
5780 			view->count = s->parent_view->count;
5781 
5782 			if (old_selected_entry == ls->selected_entry)
5783 				break;
5784 
5785 			err = set_selected_commit(s, ls->selected_entry);
5786 			if (err)
5787 				break;
5788 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5789 			struct tog_blame_view_state *bs;
5790 			struct got_object_id *id, *prev_id;
5791 
5792 			bs = &s->parent_view->state.blame;
5793 			prev_id = get_annotation_for_line(bs->blame.lines,
5794 			    bs->blame.nlines, bs->last_diffed_line);
5795 
5796 			err = input_blame_view(&view, s->parent_view,
5797 			    up ? KEY_UP : KEY_DOWN);
5798 			if (err)
5799 				break;
5800 			view->count = s->parent_view->count;
5801 
5802 			if (prev_id == NULL)
5803 				break;
5804 			id = get_selected_commit_id(bs->blame.lines,
5805 			    bs->blame.nlines, bs->first_displayed_line,
5806 			    bs->selected_line);
5807 			if (id == NULL)
5808 				break;
5809 
5810 			if (!got_object_id_cmp(prev_id, id))
5811 				break;
5812 
5813 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5814 			if (err)
5815 				break;
5816 		}
5817 		s->first_displayed_line = 1;
5818 		s->last_displayed_line = view->nlines;
5819 		s->matched_line = 0;
5820 		view->x = 0;
5821 
5822 		diff_view_indicate_progress(view);
5823 		err = create_diff(s);
5824 		break;
5825 	default:
5826 		view->count = 0;
5827 		break;
5828 	}
5829 
5830 	return err;
5831 }
5832 
5833 static const struct got_error *
5834 cmd_diff(int argc, char *argv[])
5835 {
5836 	const struct got_error *error;
5837 	struct got_repository *repo = NULL;
5838 	struct got_worktree *worktree = NULL;
5839 	struct got_object_id *id1 = NULL, *id2 = NULL;
5840 	char *repo_path = NULL, *cwd = NULL;
5841 	char *id_str1 = NULL, *id_str2 = NULL;
5842 	char *label1 = NULL, *label2 = NULL;
5843 	int diff_context = 3, ignore_whitespace = 0;
5844 	int ch, force_text_diff = 0;
5845 	const char *errstr;
5846 	struct tog_view *view;
5847 	int *pack_fds = NULL;
5848 
5849 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5850 		switch (ch) {
5851 		case 'a':
5852 			force_text_diff = 1;
5853 			break;
5854 		case 'C':
5855 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5856 			    &errstr);
5857 			if (errstr != NULL)
5858 				errx(1, "number of context lines is %s: %s",
5859 				    errstr, errstr);
5860 			break;
5861 		case 'r':
5862 			repo_path = realpath(optarg, NULL);
5863 			if (repo_path == NULL)
5864 				return got_error_from_errno2("realpath",
5865 				    optarg);
5866 			got_path_strip_trailing_slashes(repo_path);
5867 			break;
5868 		case 'w':
5869 			ignore_whitespace = 1;
5870 			break;
5871 		default:
5872 			usage_diff();
5873 			/* NOTREACHED */
5874 		}
5875 	}
5876 
5877 	argc -= optind;
5878 	argv += optind;
5879 
5880 	if (argc == 0) {
5881 		usage_diff(); /* TODO show local worktree changes */
5882 	} else if (argc == 2) {
5883 		id_str1 = argv[0];
5884 		id_str2 = argv[1];
5885 	} else
5886 		usage_diff();
5887 
5888 	error = got_repo_pack_fds_open(&pack_fds);
5889 	if (error)
5890 		goto done;
5891 
5892 	if (repo_path == NULL) {
5893 		cwd = getcwd(NULL, 0);
5894 		if (cwd == NULL)
5895 			return got_error_from_errno("getcwd");
5896 		error = got_worktree_open(&worktree, cwd);
5897 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5898 			goto done;
5899 		if (worktree)
5900 			repo_path =
5901 			    strdup(got_worktree_get_repo_path(worktree));
5902 		else
5903 			repo_path = strdup(cwd);
5904 		if (repo_path == NULL) {
5905 			error = got_error_from_errno("strdup");
5906 			goto done;
5907 		}
5908 	}
5909 
5910 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5911 	if (error)
5912 		goto done;
5913 
5914 	init_curses();
5915 
5916 	error = apply_unveil(got_repo_get_path(repo), NULL);
5917 	if (error)
5918 		goto done;
5919 
5920 	error = tog_load_refs(repo, 0);
5921 	if (error)
5922 		goto done;
5923 
5924 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5925 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5926 	if (error)
5927 		goto done;
5928 
5929 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5930 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5931 	if (error)
5932 		goto done;
5933 
5934 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5935 	if (view == NULL) {
5936 		error = got_error_from_errno("view_open");
5937 		goto done;
5938 	}
5939 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5940 	    ignore_whitespace, force_text_diff, NULL,  repo);
5941 	if (error)
5942 		goto done;
5943 	error = view_loop(view);
5944 done:
5945 	free(label1);
5946 	free(label2);
5947 	free(repo_path);
5948 	free(cwd);
5949 	if (repo) {
5950 		const struct got_error *close_err = got_repo_close(repo);
5951 		if (error == NULL)
5952 			error = close_err;
5953 	}
5954 	if (worktree)
5955 		got_worktree_close(worktree);
5956 	if (pack_fds) {
5957 		const struct got_error *pack_err =
5958 		    got_repo_pack_fds_close(pack_fds);
5959 		if (error == NULL)
5960 			error = pack_err;
5961 	}
5962 	tog_free_refs();
5963 	return error;
5964 }
5965 
5966 __dead static void
5967 usage_blame(void)
5968 {
5969 	endwin();
5970 	fprintf(stderr,
5971 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5972 	    getprogname());
5973 	exit(1);
5974 }
5975 
5976 struct tog_blame_line {
5977 	int annotated;
5978 	struct got_object_id *id;
5979 };
5980 
5981 static const struct got_error *
5982 draw_blame(struct tog_view *view)
5983 {
5984 	struct tog_blame_view_state *s = &view->state.blame;
5985 	struct tog_blame *blame = &s->blame;
5986 	regmatch_t *regmatch = &view->regmatch;
5987 	const struct got_error *err;
5988 	int lineno = 0, nprinted = 0;
5989 	char *line = NULL;
5990 	size_t linesize = 0;
5991 	ssize_t linelen;
5992 	wchar_t *wline;
5993 	int width;
5994 	struct tog_blame_line *blame_line;
5995 	struct got_object_id *prev_id = NULL;
5996 	char *id_str;
5997 	struct tog_color *tc;
5998 
5999 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6000 	if (err)
6001 		return err;
6002 
6003 	rewind(blame->f);
6004 	werase(view->window);
6005 
6006 	if (asprintf(&line, "commit %s", id_str) == -1) {
6007 		err = got_error_from_errno("asprintf");
6008 		free(id_str);
6009 		return err;
6010 	}
6011 
6012 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6013 	free(line);
6014 	line = NULL;
6015 	if (err)
6016 		return err;
6017 	if (view_needs_focus_indication(view))
6018 		wstandout(view->window);
6019 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6020 	if (tc)
6021 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6022 	waddwstr(view->window, wline);
6023 	while (width++ < view->ncols)
6024 		waddch(view->window, ' ');
6025 	if (tc)
6026 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6027 	if (view_needs_focus_indication(view))
6028 		wstandend(view->window);
6029 	free(wline);
6030 	wline = NULL;
6031 
6032 	if (view->gline > blame->nlines)
6033 		view->gline = blame->nlines;
6034 
6035 	if (tog_io.wait_for_ui) {
6036 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6037 		int rc;
6038 
6039 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6040 		if (rc)
6041 			return got_error_set_errno(rc, "pthread_cond_wait");
6042 		tog_io.wait_for_ui = 0;
6043 	}
6044 
6045 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6046 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6047 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6048 		free(id_str);
6049 		return got_error_from_errno("asprintf");
6050 	}
6051 	free(id_str);
6052 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6053 	free(line);
6054 	line = NULL;
6055 	if (err)
6056 		return err;
6057 	waddwstr(view->window, wline);
6058 	free(wline);
6059 	wline = NULL;
6060 	if (width < view->ncols - 1)
6061 		waddch(view->window, '\n');
6062 
6063 	s->eof = 0;
6064 	view->maxx = 0;
6065 	while (nprinted < view->nlines - 2) {
6066 		linelen = getline(&line, &linesize, blame->f);
6067 		if (linelen == -1) {
6068 			if (feof(blame->f)) {
6069 				s->eof = 1;
6070 				break;
6071 			}
6072 			free(line);
6073 			return got_ferror(blame->f, GOT_ERR_IO);
6074 		}
6075 		if (++lineno < s->first_displayed_line)
6076 			continue;
6077 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6078 			continue;
6079 
6080 		/* Set view->maxx based on full line length. */
6081 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6082 		if (err) {
6083 			free(line);
6084 			return err;
6085 		}
6086 		free(wline);
6087 		wline = NULL;
6088 		view->maxx = MAX(view->maxx, width);
6089 
6090 		if (nprinted == s->selected_line - 1)
6091 			wstandout(view->window);
6092 
6093 		if (blame->nlines > 0) {
6094 			blame_line = &blame->lines[lineno - 1];
6095 			if (blame_line->annotated && prev_id &&
6096 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6097 			    !(nprinted == s->selected_line - 1)) {
6098 				waddstr(view->window, "        ");
6099 			} else if (blame_line->annotated) {
6100 				char *id_str;
6101 				err = got_object_id_str(&id_str,
6102 				    blame_line->id);
6103 				if (err) {
6104 					free(line);
6105 					return err;
6106 				}
6107 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6108 				if (tc)
6109 					wattr_on(view->window,
6110 					    COLOR_PAIR(tc->colorpair), NULL);
6111 				wprintw(view->window, "%.8s", id_str);
6112 				if (tc)
6113 					wattr_off(view->window,
6114 					    COLOR_PAIR(tc->colorpair), NULL);
6115 				free(id_str);
6116 				prev_id = blame_line->id;
6117 			} else {
6118 				waddstr(view->window, "........");
6119 				prev_id = NULL;
6120 			}
6121 		} else {
6122 			waddstr(view->window, "........");
6123 			prev_id = NULL;
6124 		}
6125 
6126 		if (nprinted == s->selected_line - 1)
6127 			wstandend(view->window);
6128 		waddstr(view->window, " ");
6129 
6130 		if (view->ncols <= 9) {
6131 			width = 9;
6132 		} else if (s->first_displayed_line + nprinted ==
6133 		    s->matched_line &&
6134 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6135 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6136 			    view->window, view->x, regmatch);
6137 			if (err) {
6138 				free(line);
6139 				return err;
6140 			}
6141 			width += 9;
6142 		} else {
6143 			int skip;
6144 			err = format_line(&wline, &width, &skip, line,
6145 			    view->x, view->ncols - 9, 9, 1);
6146 			if (err) {
6147 				free(line);
6148 				return err;
6149 			}
6150 			waddwstr(view->window, &wline[skip]);
6151 			width += 9;
6152 			free(wline);
6153 			wline = NULL;
6154 		}
6155 
6156 		if (width <= view->ncols - 1)
6157 			waddch(view->window, '\n');
6158 		if (++nprinted == 1)
6159 			s->first_displayed_line = lineno;
6160 	}
6161 	free(line);
6162 	s->last_displayed_line = lineno;
6163 
6164 	view_border(view);
6165 
6166 	return NULL;
6167 }
6168 
6169 static const struct got_error *
6170 blame_cb(void *arg, int nlines, int lineno,
6171     struct got_commit_object *commit, struct got_object_id *id)
6172 {
6173 	const struct got_error *err = NULL;
6174 	struct tog_blame_cb_args *a = arg;
6175 	struct tog_blame_line *line;
6176 	int errcode;
6177 
6178 	if (nlines != a->nlines ||
6179 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6180 		return got_error(GOT_ERR_RANGE);
6181 
6182 	errcode = pthread_mutex_lock(&tog_mutex);
6183 	if (errcode)
6184 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6185 
6186 	if (*a->quit) {	/* user has quit the blame view */
6187 		err = got_error(GOT_ERR_ITER_COMPLETED);
6188 		goto done;
6189 	}
6190 
6191 	if (lineno == -1)
6192 		goto done; /* no change in this commit */
6193 
6194 	line = &a->lines[lineno - 1];
6195 	if (line->annotated)
6196 		goto done;
6197 
6198 	line->id = got_object_id_dup(id);
6199 	if (line->id == NULL) {
6200 		err = got_error_from_errno("got_object_id_dup");
6201 		goto done;
6202 	}
6203 	line->annotated = 1;
6204 done:
6205 	errcode = pthread_mutex_unlock(&tog_mutex);
6206 	if (errcode)
6207 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6208 	return err;
6209 }
6210 
6211 static void *
6212 blame_thread(void *arg)
6213 {
6214 	const struct got_error *err, *close_err;
6215 	struct tog_blame_thread_args *ta = arg;
6216 	struct tog_blame_cb_args *a = ta->cb_args;
6217 	int errcode, fd1 = -1, fd2 = -1;
6218 	FILE *f1 = NULL, *f2 = NULL;
6219 
6220 	fd1 = got_opentempfd();
6221 	if (fd1 == -1)
6222 		return (void *)got_error_from_errno("got_opentempfd");
6223 
6224 	fd2 = got_opentempfd();
6225 	if (fd2 == -1) {
6226 		err = got_error_from_errno("got_opentempfd");
6227 		goto done;
6228 	}
6229 
6230 	f1 = got_opentemp();
6231 	if (f1 == NULL) {
6232 		err = (void *)got_error_from_errno("got_opentemp");
6233 		goto done;
6234 	}
6235 	f2 = got_opentemp();
6236 	if (f2 == NULL) {
6237 		err = (void *)got_error_from_errno("got_opentemp");
6238 		goto done;
6239 	}
6240 
6241 	err = block_signals_used_by_main_thread();
6242 	if (err)
6243 		goto done;
6244 
6245 	err = got_blame(ta->path, a->commit_id, ta->repo,
6246 	    tog_diff_algo, blame_cb, ta->cb_args,
6247 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6248 	if (err && err->code == GOT_ERR_CANCELLED)
6249 		err = NULL;
6250 
6251 	errcode = pthread_mutex_lock(&tog_mutex);
6252 	if (errcode) {
6253 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6254 		goto done;
6255 	}
6256 
6257 	close_err = got_repo_close(ta->repo);
6258 	if (err == NULL)
6259 		err = close_err;
6260 	ta->repo = NULL;
6261 	*ta->complete = 1;
6262 
6263 	if (tog_io.wait_for_ui) {
6264 		errcode = pthread_cond_signal(&ta->blame_complete);
6265 		if (errcode && err == NULL)
6266 			err = got_error_set_errno(errcode,
6267 			    "pthread_cond_signal");
6268 	}
6269 
6270 	errcode = pthread_mutex_unlock(&tog_mutex);
6271 	if (errcode && err == NULL)
6272 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6273 
6274 done:
6275 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6276 		err = got_error_from_errno("close");
6277 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6278 		err = got_error_from_errno("close");
6279 	if (f1 && fclose(f1) == EOF && err == NULL)
6280 		err = got_error_from_errno("fclose");
6281 	if (f2 && fclose(f2) == EOF && err == NULL)
6282 		err = got_error_from_errno("fclose");
6283 
6284 	return (void *)err;
6285 }
6286 
6287 static struct got_object_id *
6288 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6289     int first_displayed_line, int selected_line)
6290 {
6291 	struct tog_blame_line *line;
6292 
6293 	if (nlines <= 0)
6294 		return NULL;
6295 
6296 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6297 	if (!line->annotated)
6298 		return NULL;
6299 
6300 	return line->id;
6301 }
6302 
6303 static struct got_object_id *
6304 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6305     int lineno)
6306 {
6307 	struct tog_blame_line *line;
6308 
6309 	if (nlines <= 0 || lineno >= nlines)
6310 		return NULL;
6311 
6312 	line = &lines[lineno - 1];
6313 	if (!line->annotated)
6314 		return NULL;
6315 
6316 	return line->id;
6317 }
6318 
6319 static const struct got_error *
6320 stop_blame(struct tog_blame *blame)
6321 {
6322 	const struct got_error *err = NULL;
6323 	int i;
6324 
6325 	if (blame->thread) {
6326 		int errcode;
6327 		errcode = pthread_mutex_unlock(&tog_mutex);
6328 		if (errcode)
6329 			return got_error_set_errno(errcode,
6330 			    "pthread_mutex_unlock");
6331 		errcode = pthread_join(blame->thread, (void **)&err);
6332 		if (errcode)
6333 			return got_error_set_errno(errcode, "pthread_join");
6334 		errcode = pthread_mutex_lock(&tog_mutex);
6335 		if (errcode)
6336 			return got_error_set_errno(errcode,
6337 			    "pthread_mutex_lock");
6338 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6339 			err = NULL;
6340 		blame->thread = NULL;
6341 	}
6342 	if (blame->thread_args.repo) {
6343 		const struct got_error *close_err;
6344 		close_err = got_repo_close(blame->thread_args.repo);
6345 		if (err == NULL)
6346 			err = close_err;
6347 		blame->thread_args.repo = NULL;
6348 	}
6349 	if (blame->f) {
6350 		if (fclose(blame->f) == EOF && err == NULL)
6351 			err = got_error_from_errno("fclose");
6352 		blame->f = NULL;
6353 	}
6354 	if (blame->lines) {
6355 		for (i = 0; i < blame->nlines; i++)
6356 			free(blame->lines[i].id);
6357 		free(blame->lines);
6358 		blame->lines = NULL;
6359 	}
6360 	free(blame->cb_args.commit_id);
6361 	blame->cb_args.commit_id = NULL;
6362 	if (blame->pack_fds) {
6363 		const struct got_error *pack_err =
6364 		    got_repo_pack_fds_close(blame->pack_fds);
6365 		if (err == NULL)
6366 			err = pack_err;
6367 		blame->pack_fds = NULL;
6368 	}
6369 	return err;
6370 }
6371 
6372 static const struct got_error *
6373 cancel_blame_view(void *arg)
6374 {
6375 	const struct got_error *err = NULL;
6376 	int *done = arg;
6377 	int errcode;
6378 
6379 	errcode = pthread_mutex_lock(&tog_mutex);
6380 	if (errcode)
6381 		return got_error_set_errno(errcode,
6382 		    "pthread_mutex_unlock");
6383 
6384 	if (*done)
6385 		err = got_error(GOT_ERR_CANCELLED);
6386 
6387 	errcode = pthread_mutex_unlock(&tog_mutex);
6388 	if (errcode)
6389 		return got_error_set_errno(errcode,
6390 		    "pthread_mutex_lock");
6391 
6392 	return err;
6393 }
6394 
6395 static const struct got_error *
6396 run_blame(struct tog_view *view)
6397 {
6398 	struct tog_blame_view_state *s = &view->state.blame;
6399 	struct tog_blame *blame = &s->blame;
6400 	const struct got_error *err = NULL;
6401 	struct got_commit_object *commit = NULL;
6402 	struct got_blob_object *blob = NULL;
6403 	struct got_repository *thread_repo = NULL;
6404 	struct got_object_id *obj_id = NULL;
6405 	int obj_type, fd = -1;
6406 	int *pack_fds = NULL;
6407 
6408 	err = got_object_open_as_commit(&commit, s->repo,
6409 	    &s->blamed_commit->id);
6410 	if (err)
6411 		return err;
6412 
6413 	fd = got_opentempfd();
6414 	if (fd == -1) {
6415 		err = got_error_from_errno("got_opentempfd");
6416 		goto done;
6417 	}
6418 
6419 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6420 	if (err)
6421 		goto done;
6422 
6423 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6424 	if (err)
6425 		goto done;
6426 
6427 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6428 		err = got_error(GOT_ERR_OBJ_TYPE);
6429 		goto done;
6430 	}
6431 
6432 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6433 	if (err)
6434 		goto done;
6435 	blame->f = got_opentemp();
6436 	if (blame->f == NULL) {
6437 		err = got_error_from_errno("got_opentemp");
6438 		goto done;
6439 	}
6440 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6441 	    &blame->line_offsets, blame->f, blob);
6442 	if (err)
6443 		goto done;
6444 	if (blame->nlines == 0) {
6445 		s->blame_complete = 1;
6446 		goto done;
6447 	}
6448 
6449 	/* Don't include \n at EOF in the blame line count. */
6450 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6451 		blame->nlines--;
6452 
6453 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6454 	if (blame->lines == NULL) {
6455 		err = got_error_from_errno("calloc");
6456 		goto done;
6457 	}
6458 
6459 	err = got_repo_pack_fds_open(&pack_fds);
6460 	if (err)
6461 		goto done;
6462 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6463 	    pack_fds);
6464 	if (err)
6465 		goto done;
6466 
6467 	blame->pack_fds = pack_fds;
6468 	blame->cb_args.view = view;
6469 	blame->cb_args.lines = blame->lines;
6470 	blame->cb_args.nlines = blame->nlines;
6471 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6472 	if (blame->cb_args.commit_id == NULL) {
6473 		err = got_error_from_errno("got_object_id_dup");
6474 		goto done;
6475 	}
6476 	blame->cb_args.quit = &s->done;
6477 
6478 	blame->thread_args.path = s->path;
6479 	blame->thread_args.repo = thread_repo;
6480 	blame->thread_args.cb_args = &blame->cb_args;
6481 	blame->thread_args.complete = &s->blame_complete;
6482 	blame->thread_args.cancel_cb = cancel_blame_view;
6483 	blame->thread_args.cancel_arg = &s->done;
6484 	s->blame_complete = 0;
6485 
6486 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6487 		s->first_displayed_line = 1;
6488 		s->last_displayed_line = view->nlines;
6489 		s->selected_line = 1;
6490 	}
6491 	s->matched_line = 0;
6492 
6493 done:
6494 	if (commit)
6495 		got_object_commit_close(commit);
6496 	if (fd != -1 && close(fd) == -1 && err == NULL)
6497 		err = got_error_from_errno("close");
6498 	if (blob)
6499 		got_object_blob_close(blob);
6500 	free(obj_id);
6501 	if (err)
6502 		stop_blame(blame);
6503 	return err;
6504 }
6505 
6506 static const struct got_error *
6507 open_blame_view(struct tog_view *view, char *path,
6508     struct got_object_id *commit_id, struct got_repository *repo)
6509 {
6510 	const struct got_error *err = NULL;
6511 	struct tog_blame_view_state *s = &view->state.blame;
6512 
6513 	STAILQ_INIT(&s->blamed_commits);
6514 
6515 	s->path = strdup(path);
6516 	if (s->path == NULL)
6517 		return got_error_from_errno("strdup");
6518 
6519 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6520 	if (err) {
6521 		free(s->path);
6522 		return err;
6523 	}
6524 
6525 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6526 	s->first_displayed_line = 1;
6527 	s->last_displayed_line = view->nlines;
6528 	s->selected_line = 1;
6529 	s->blame_complete = 0;
6530 	s->repo = repo;
6531 	s->commit_id = commit_id;
6532 	memset(&s->blame, 0, sizeof(s->blame));
6533 
6534 	STAILQ_INIT(&s->colors);
6535 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6536 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6537 		    get_color_value("TOG_COLOR_COMMIT"));
6538 		if (err)
6539 			return err;
6540 	}
6541 
6542 	view->show = show_blame_view;
6543 	view->input = input_blame_view;
6544 	view->reset = reset_blame_view;
6545 	view->close = close_blame_view;
6546 	view->search_start = search_start_blame_view;
6547 	view->search_setup = search_setup_blame_view;
6548 	view->search_next = search_next_view_match;
6549 
6550 	if (using_mock_io) {
6551 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6552 		int rc;
6553 
6554 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6555 		if (rc)
6556 			return got_error_set_errno(rc, "pthread_cond_init");
6557 	}
6558 
6559 	return run_blame(view);
6560 }
6561 
6562 static const struct got_error *
6563 close_blame_view(struct tog_view *view)
6564 {
6565 	const struct got_error *err = NULL;
6566 	struct tog_blame_view_state *s = &view->state.blame;
6567 
6568 	if (s->blame.thread)
6569 		err = stop_blame(&s->blame);
6570 
6571 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6572 		struct got_object_qid *blamed_commit;
6573 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6574 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6575 		got_object_qid_free(blamed_commit);
6576 	}
6577 
6578 	if (using_mock_io) {
6579 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6580 		int rc;
6581 
6582 		rc = pthread_cond_destroy(&bta->blame_complete);
6583 		if (rc && err == NULL)
6584 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6585 	}
6586 
6587 	free(s->path);
6588 	free_colors(&s->colors);
6589 	return err;
6590 }
6591 
6592 static const struct got_error *
6593 search_start_blame_view(struct tog_view *view)
6594 {
6595 	struct tog_blame_view_state *s = &view->state.blame;
6596 
6597 	s->matched_line = 0;
6598 	return NULL;
6599 }
6600 
6601 static void
6602 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6603     size_t *nlines, int **first, int **last, int **match, int **selected)
6604 {
6605 	struct tog_blame_view_state *s = &view->state.blame;
6606 
6607 	*f = s->blame.f;
6608 	*nlines = s->blame.nlines;
6609 	*line_offsets = s->blame.line_offsets;
6610 	*match = &s->matched_line;
6611 	*first = &s->first_displayed_line;
6612 	*last = &s->last_displayed_line;
6613 	*selected = &s->selected_line;
6614 }
6615 
6616 static const struct got_error *
6617 show_blame_view(struct tog_view *view)
6618 {
6619 	const struct got_error *err = NULL;
6620 	struct tog_blame_view_state *s = &view->state.blame;
6621 	int errcode;
6622 
6623 	if (s->blame.thread == NULL && !s->blame_complete) {
6624 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6625 		    &s->blame.thread_args);
6626 		if (errcode)
6627 			return got_error_set_errno(errcode, "pthread_create");
6628 
6629 		if (!using_mock_io)
6630 			halfdelay(1); /* fast refresh while annotating  */
6631 	}
6632 
6633 	if (s->blame_complete && !using_mock_io)
6634 		halfdelay(10); /* disable fast refresh */
6635 
6636 	err = draw_blame(view);
6637 
6638 	view_border(view);
6639 	return err;
6640 }
6641 
6642 static const struct got_error *
6643 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6644     struct got_repository *repo, struct got_object_id *id)
6645 {
6646 	struct tog_view		*log_view;
6647 	const struct got_error	*err = NULL;
6648 
6649 	*new_view = NULL;
6650 
6651 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6652 	if (log_view == NULL)
6653 		return got_error_from_errno("view_open");
6654 
6655 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6656 	if (err)
6657 		view_close(log_view);
6658 	else
6659 		*new_view = log_view;
6660 
6661 	return err;
6662 }
6663 
6664 static const struct got_error *
6665 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6666 {
6667 	const struct got_error *err = NULL, *thread_err = NULL;
6668 	struct tog_view *diff_view;
6669 	struct tog_blame_view_state *s = &view->state.blame;
6670 	int eos, nscroll, begin_y = 0, begin_x = 0;
6671 
6672 	eos = nscroll = view->nlines - 2;
6673 	if (view_is_hsplit_top(view))
6674 		--eos;  /* border */
6675 
6676 	switch (ch) {
6677 	case '0':
6678 	case '$':
6679 	case KEY_RIGHT:
6680 	case 'l':
6681 	case KEY_LEFT:
6682 	case 'h':
6683 		horizontal_scroll_input(view, ch);
6684 		break;
6685 	case 'q':
6686 		s->done = 1;
6687 		break;
6688 	case 'g':
6689 	case KEY_HOME:
6690 		s->selected_line = 1;
6691 		s->first_displayed_line = 1;
6692 		view->count = 0;
6693 		break;
6694 	case 'G':
6695 	case KEY_END:
6696 		if (s->blame.nlines < eos) {
6697 			s->selected_line = s->blame.nlines;
6698 			s->first_displayed_line = 1;
6699 		} else {
6700 			s->selected_line = eos;
6701 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6702 		}
6703 		view->count = 0;
6704 		break;
6705 	case 'k':
6706 	case KEY_UP:
6707 	case CTRL('p'):
6708 		if (s->selected_line > 1)
6709 			s->selected_line--;
6710 		else if (s->selected_line == 1 &&
6711 		    s->first_displayed_line > 1)
6712 			s->first_displayed_line--;
6713 		else
6714 			view->count = 0;
6715 		break;
6716 	case CTRL('u'):
6717 	case 'u':
6718 		nscroll /= 2;
6719 		/* FALL THROUGH */
6720 	case KEY_PPAGE:
6721 	case CTRL('b'):
6722 	case 'b':
6723 		if (s->first_displayed_line == 1) {
6724 			if (view->count > 1)
6725 				nscroll += nscroll;
6726 			s->selected_line = MAX(1, s->selected_line - nscroll);
6727 			view->count = 0;
6728 			break;
6729 		}
6730 		if (s->first_displayed_line > nscroll)
6731 			s->first_displayed_line -= nscroll;
6732 		else
6733 			s->first_displayed_line = 1;
6734 		break;
6735 	case 'j':
6736 	case KEY_DOWN:
6737 	case CTRL('n'):
6738 		if (s->selected_line < eos && s->first_displayed_line +
6739 		    s->selected_line <= s->blame.nlines)
6740 			s->selected_line++;
6741 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6742 			s->first_displayed_line++;
6743 		else
6744 			view->count = 0;
6745 		break;
6746 	case 'c':
6747 	case 'p': {
6748 		struct got_object_id *id = NULL;
6749 
6750 		view->count = 0;
6751 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6752 		    s->first_displayed_line, s->selected_line);
6753 		if (id == NULL)
6754 			break;
6755 		if (ch == 'p') {
6756 			struct got_commit_object *commit, *pcommit;
6757 			struct got_object_qid *pid;
6758 			struct got_object_id *blob_id = NULL;
6759 			int obj_type;
6760 			err = got_object_open_as_commit(&commit,
6761 			    s->repo, id);
6762 			if (err)
6763 				break;
6764 			pid = STAILQ_FIRST(
6765 			    got_object_commit_get_parent_ids(commit));
6766 			if (pid == NULL) {
6767 				got_object_commit_close(commit);
6768 				break;
6769 			}
6770 			/* Check if path history ends here. */
6771 			err = got_object_open_as_commit(&pcommit,
6772 			    s->repo, &pid->id);
6773 			if (err)
6774 				break;
6775 			err = got_object_id_by_path(&blob_id, s->repo,
6776 			    pcommit, s->path);
6777 			got_object_commit_close(pcommit);
6778 			if (err) {
6779 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6780 					err = NULL;
6781 				got_object_commit_close(commit);
6782 				break;
6783 			}
6784 			err = got_object_get_type(&obj_type, s->repo,
6785 			    blob_id);
6786 			free(blob_id);
6787 			/* Can't blame non-blob type objects. */
6788 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6789 				got_object_commit_close(commit);
6790 				break;
6791 			}
6792 			err = got_object_qid_alloc(&s->blamed_commit,
6793 			    &pid->id);
6794 			got_object_commit_close(commit);
6795 		} else {
6796 			if (got_object_id_cmp(id,
6797 			    &s->blamed_commit->id) == 0)
6798 				break;
6799 			err = got_object_qid_alloc(&s->blamed_commit,
6800 			    id);
6801 		}
6802 		if (err)
6803 			break;
6804 		s->done = 1;
6805 		thread_err = stop_blame(&s->blame);
6806 		s->done = 0;
6807 		if (thread_err)
6808 			break;
6809 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6810 		    s->blamed_commit, entry);
6811 		err = run_blame(view);
6812 		if (err)
6813 			break;
6814 		break;
6815 	}
6816 	case 'C': {
6817 		struct got_object_qid *first;
6818 
6819 		view->count = 0;
6820 		first = STAILQ_FIRST(&s->blamed_commits);
6821 		if (!got_object_id_cmp(&first->id, s->commit_id))
6822 			break;
6823 		s->done = 1;
6824 		thread_err = stop_blame(&s->blame);
6825 		s->done = 0;
6826 		if (thread_err)
6827 			break;
6828 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6829 		got_object_qid_free(s->blamed_commit);
6830 		s->blamed_commit =
6831 		    STAILQ_FIRST(&s->blamed_commits);
6832 		err = run_blame(view);
6833 		if (err)
6834 			break;
6835 		break;
6836 	}
6837 	case 'L':
6838 		view->count = 0;
6839 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6840 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6841 		if (s->id_to_log)
6842 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6843 		break;
6844 	case KEY_ENTER:
6845 	case '\r': {
6846 		struct got_object_id *id = NULL;
6847 		struct got_object_qid *pid;
6848 		struct got_commit_object *commit = NULL;
6849 
6850 		view->count = 0;
6851 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6852 		    s->first_displayed_line, s->selected_line);
6853 		if (id == NULL)
6854 			break;
6855 		err = got_object_open_as_commit(&commit, s->repo, id);
6856 		if (err)
6857 			break;
6858 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6859 		if (*new_view) {
6860 			/* traversed from diff view, release diff resources  */
6861 			err = close_diff_view(*new_view);
6862 			if (err)
6863 				break;
6864 			diff_view = *new_view;
6865 		} else {
6866 			if (view_is_parent_view(view))
6867 				view_get_split(view, &begin_y, &begin_x);
6868 
6869 			diff_view = view_open(0, 0, begin_y, begin_x,
6870 			    TOG_VIEW_DIFF);
6871 			if (diff_view == NULL) {
6872 				got_object_commit_close(commit);
6873 				err = got_error_from_errno("view_open");
6874 				break;
6875 			}
6876 		}
6877 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6878 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6879 		got_object_commit_close(commit);
6880 		if (err) {
6881 			view_close(diff_view);
6882 			break;
6883 		}
6884 		s->last_diffed_line = s->first_displayed_line - 1 +
6885 		    s->selected_line;
6886 		if (*new_view)
6887 			break;	/* still open from active diff view */
6888 		if (view_is_parent_view(view) &&
6889 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6890 			err = view_init_hsplit(view, begin_y);
6891 			if (err)
6892 				break;
6893 		}
6894 
6895 		view->focussed = 0;
6896 		diff_view->focussed = 1;
6897 		diff_view->mode = view->mode;
6898 		diff_view->nlines = view->lines - begin_y;
6899 		if (view_is_parent_view(view)) {
6900 			view_transfer_size(diff_view, view);
6901 			err = view_close_child(view);
6902 			if (err)
6903 				break;
6904 			err = view_set_child(view, diff_view);
6905 			if (err)
6906 				break;
6907 			view->focus_child = 1;
6908 		} else
6909 			*new_view = diff_view;
6910 		if (err)
6911 			break;
6912 		break;
6913 	}
6914 	case CTRL('d'):
6915 	case 'd':
6916 		nscroll /= 2;
6917 		/* FALL THROUGH */
6918 	case KEY_NPAGE:
6919 	case CTRL('f'):
6920 	case 'f':
6921 	case ' ':
6922 		if (s->last_displayed_line >= s->blame.nlines &&
6923 		    s->selected_line >= MIN(s->blame.nlines,
6924 		    view->nlines - 2)) {
6925 			view->count = 0;
6926 			break;
6927 		}
6928 		if (s->last_displayed_line >= s->blame.nlines &&
6929 		    s->selected_line < view->nlines - 2) {
6930 			s->selected_line +=
6931 			    MIN(nscroll, s->last_displayed_line -
6932 			    s->first_displayed_line - s->selected_line + 1);
6933 		}
6934 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6935 			s->first_displayed_line += nscroll;
6936 		else
6937 			s->first_displayed_line =
6938 			    s->blame.nlines - (view->nlines - 3);
6939 		break;
6940 	case KEY_RESIZE:
6941 		if (s->selected_line > view->nlines - 2) {
6942 			s->selected_line = MIN(s->blame.nlines,
6943 			    view->nlines - 2);
6944 		}
6945 		break;
6946 	default:
6947 		view->count = 0;
6948 		break;
6949 	}
6950 	return thread_err ? thread_err : err;
6951 }
6952 
6953 static const struct got_error *
6954 reset_blame_view(struct tog_view *view)
6955 {
6956 	const struct got_error *err;
6957 	struct tog_blame_view_state *s = &view->state.blame;
6958 
6959 	view->count = 0;
6960 	s->done = 1;
6961 	err = stop_blame(&s->blame);
6962 	s->done = 0;
6963 	if (err)
6964 		return err;
6965 	return run_blame(view);
6966 }
6967 
6968 static const struct got_error *
6969 cmd_blame(int argc, char *argv[])
6970 {
6971 	const struct got_error *error;
6972 	struct got_repository *repo = NULL;
6973 	struct got_worktree *worktree = NULL;
6974 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6975 	char *link_target = NULL;
6976 	struct got_object_id *commit_id = NULL;
6977 	struct got_commit_object *commit = NULL;
6978 	char *commit_id_str = NULL;
6979 	int ch;
6980 	struct tog_view *view = NULL;
6981 	int *pack_fds = NULL;
6982 
6983 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6984 		switch (ch) {
6985 		case 'c':
6986 			commit_id_str = optarg;
6987 			break;
6988 		case 'r':
6989 			repo_path = realpath(optarg, NULL);
6990 			if (repo_path == NULL)
6991 				return got_error_from_errno2("realpath",
6992 				    optarg);
6993 			break;
6994 		default:
6995 			usage_blame();
6996 			/* NOTREACHED */
6997 		}
6998 	}
6999 
7000 	argc -= optind;
7001 	argv += optind;
7002 
7003 	if (argc != 1)
7004 		usage_blame();
7005 
7006 	error = got_repo_pack_fds_open(&pack_fds);
7007 	if (error != NULL)
7008 		goto done;
7009 
7010 	if (repo_path == NULL) {
7011 		cwd = getcwd(NULL, 0);
7012 		if (cwd == NULL)
7013 			return got_error_from_errno("getcwd");
7014 		error = got_worktree_open(&worktree, cwd);
7015 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7016 			goto done;
7017 		if (worktree)
7018 			repo_path =
7019 			    strdup(got_worktree_get_repo_path(worktree));
7020 		else
7021 			repo_path = strdup(cwd);
7022 		if (repo_path == NULL) {
7023 			error = got_error_from_errno("strdup");
7024 			goto done;
7025 		}
7026 	}
7027 
7028 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7029 	if (error != NULL)
7030 		goto done;
7031 
7032 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7033 	    worktree);
7034 	if (error)
7035 		goto done;
7036 
7037 	init_curses();
7038 
7039 	error = apply_unveil(got_repo_get_path(repo), NULL);
7040 	if (error)
7041 		goto done;
7042 
7043 	error = tog_load_refs(repo, 0);
7044 	if (error)
7045 		goto done;
7046 
7047 	if (commit_id_str == NULL) {
7048 		struct got_reference *head_ref;
7049 		error = got_ref_open(&head_ref, repo, worktree ?
7050 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7051 		if (error != NULL)
7052 			goto done;
7053 		error = got_ref_resolve(&commit_id, repo, head_ref);
7054 		got_ref_close(head_ref);
7055 	} else {
7056 		error = got_repo_match_object_id(&commit_id, NULL,
7057 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7058 	}
7059 	if (error != NULL)
7060 		goto done;
7061 
7062 	error = got_object_open_as_commit(&commit, repo, commit_id);
7063 	if (error)
7064 		goto done;
7065 
7066 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7067 	    commit, repo);
7068 	if (error)
7069 		goto done;
7070 
7071 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7072 	if (view == NULL) {
7073 		error = got_error_from_errno("view_open");
7074 		goto done;
7075 	}
7076 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7077 	    commit_id, repo);
7078 	if (error != NULL) {
7079 		if (view->close == NULL)
7080 			close_blame_view(view);
7081 		view_close(view);
7082 		goto done;
7083 	}
7084 	if (worktree) {
7085 		/* Release work tree lock. */
7086 		got_worktree_close(worktree);
7087 		worktree = NULL;
7088 	}
7089 	error = view_loop(view);
7090 done:
7091 	free(repo_path);
7092 	free(in_repo_path);
7093 	free(link_target);
7094 	free(cwd);
7095 	free(commit_id);
7096 	if (commit)
7097 		got_object_commit_close(commit);
7098 	if (worktree)
7099 		got_worktree_close(worktree);
7100 	if (repo) {
7101 		const struct got_error *close_err = got_repo_close(repo);
7102 		if (error == NULL)
7103 			error = close_err;
7104 	}
7105 	if (pack_fds) {
7106 		const struct got_error *pack_err =
7107 		    got_repo_pack_fds_close(pack_fds);
7108 		if (error == NULL)
7109 			error = pack_err;
7110 	}
7111 	tog_free_refs();
7112 	return error;
7113 }
7114 
7115 static const struct got_error *
7116 draw_tree_entries(struct tog_view *view, const char *parent_path)
7117 {
7118 	struct tog_tree_view_state *s = &view->state.tree;
7119 	const struct got_error *err = NULL;
7120 	struct got_tree_entry *te;
7121 	wchar_t *wline;
7122 	char *index = NULL;
7123 	struct tog_color *tc;
7124 	int width, n, nentries, scrollx, i = 1;
7125 	int limit = view->nlines;
7126 
7127 	s->ndisplayed = 0;
7128 	if (view_is_hsplit_top(view))
7129 		--limit;  /* border */
7130 
7131 	werase(view->window);
7132 
7133 	if (limit == 0)
7134 		return NULL;
7135 
7136 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7137 	    0, 0);
7138 	if (err)
7139 		return err;
7140 	if (view_needs_focus_indication(view))
7141 		wstandout(view->window);
7142 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7143 	if (tc)
7144 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7145 	waddwstr(view->window, wline);
7146 	free(wline);
7147 	wline = NULL;
7148 	while (width++ < view->ncols)
7149 		waddch(view->window, ' ');
7150 	if (tc)
7151 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7152 	if (view_needs_focus_indication(view))
7153 		wstandend(view->window);
7154 	if (--limit <= 0)
7155 		return NULL;
7156 
7157 	i += s->selected;
7158 	if (s->first_displayed_entry) {
7159 		i += got_tree_entry_get_index(s->first_displayed_entry);
7160 		if (s->tree != s->root)
7161 			++i;  /* account for ".." entry */
7162 	}
7163 	nentries = got_object_tree_get_nentries(s->tree);
7164 	if (asprintf(&index, "[%d/%d] %s",
7165 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7166 		return got_error_from_errno("asprintf");
7167 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7168 	free(index);
7169 	if (err)
7170 		return err;
7171 	waddwstr(view->window, wline);
7172 	free(wline);
7173 	wline = NULL;
7174 	if (width < view->ncols - 1)
7175 		waddch(view->window, '\n');
7176 	if (--limit <= 0)
7177 		return NULL;
7178 	waddch(view->window, '\n');
7179 	if (--limit <= 0)
7180 		return NULL;
7181 
7182 	if (s->first_displayed_entry == NULL) {
7183 		te = got_object_tree_get_first_entry(s->tree);
7184 		if (s->selected == 0) {
7185 			if (view->focussed)
7186 				wstandout(view->window);
7187 			s->selected_entry = NULL;
7188 		}
7189 		waddstr(view->window, "  ..\n");	/* parent directory */
7190 		if (s->selected == 0 && view->focussed)
7191 			wstandend(view->window);
7192 		s->ndisplayed++;
7193 		if (--limit <= 0)
7194 			return NULL;
7195 		n = 1;
7196 	} else {
7197 		n = 0;
7198 		te = s->first_displayed_entry;
7199 	}
7200 
7201 	view->maxx = 0;
7202 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7203 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7204 		const char *modestr = "";
7205 		mode_t mode;
7206 
7207 		te = got_object_tree_get_entry(s->tree, i);
7208 		mode = got_tree_entry_get_mode(te);
7209 
7210 		if (s->show_ids) {
7211 			err = got_object_id_str(&id_str,
7212 			    got_tree_entry_get_id(te));
7213 			if (err)
7214 				return got_error_from_errno(
7215 				    "got_object_id_str");
7216 		}
7217 		if (got_object_tree_entry_is_submodule(te))
7218 			modestr = "$";
7219 		else if (S_ISLNK(mode)) {
7220 			int i;
7221 
7222 			err = got_tree_entry_get_symlink_target(&link_target,
7223 			    te, s->repo);
7224 			if (err) {
7225 				free(id_str);
7226 				return err;
7227 			}
7228 			for (i = 0; i < strlen(link_target); i++) {
7229 				if (!isprint((unsigned char)link_target[i]))
7230 					link_target[i] = '?';
7231 			}
7232 			modestr = "@";
7233 		}
7234 		else if (S_ISDIR(mode))
7235 			modestr = "/";
7236 		else if (mode & S_IXUSR)
7237 			modestr = "*";
7238 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7239 		    got_tree_entry_get_name(te), modestr,
7240 		    link_target ? " -> ": "",
7241 		    link_target ? link_target : "") == -1) {
7242 			free(id_str);
7243 			free(link_target);
7244 			return got_error_from_errno("asprintf");
7245 		}
7246 		free(id_str);
7247 		free(link_target);
7248 
7249 		/* use full line width to determine view->maxx */
7250 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7251 		if (err) {
7252 			free(line);
7253 			break;
7254 		}
7255 		view->maxx = MAX(view->maxx, width);
7256 		free(wline);
7257 		wline = NULL;
7258 
7259 		err = format_line(&wline, &width, &scrollx, line, view->x,
7260 		    view->ncols, 0, 0);
7261 		if (err) {
7262 			free(line);
7263 			break;
7264 		}
7265 		if (n == s->selected) {
7266 			if (view->focussed)
7267 				wstandout(view->window);
7268 			s->selected_entry = te;
7269 		}
7270 		tc = match_color(&s->colors, line);
7271 		if (tc)
7272 			wattr_on(view->window,
7273 			    COLOR_PAIR(tc->colorpair), NULL);
7274 		waddwstr(view->window, &wline[scrollx]);
7275 		if (tc)
7276 			wattr_off(view->window,
7277 			    COLOR_PAIR(tc->colorpair), NULL);
7278 		if (width < view->ncols)
7279 			waddch(view->window, '\n');
7280 		if (n == s->selected && view->focussed)
7281 			wstandend(view->window);
7282 		free(line);
7283 		free(wline);
7284 		wline = NULL;
7285 		n++;
7286 		s->ndisplayed++;
7287 		s->last_displayed_entry = te;
7288 		if (--limit <= 0)
7289 			break;
7290 	}
7291 
7292 	return err;
7293 }
7294 
7295 static void
7296 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7297 {
7298 	struct got_tree_entry *te;
7299 	int isroot = s->tree == s->root;
7300 	int i = 0;
7301 
7302 	if (s->first_displayed_entry == NULL)
7303 		return;
7304 
7305 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7306 	while (i++ < maxscroll) {
7307 		if (te == NULL) {
7308 			if (!isroot)
7309 				s->first_displayed_entry = NULL;
7310 			break;
7311 		}
7312 		s->first_displayed_entry = te;
7313 		te = got_tree_entry_get_prev(s->tree, te);
7314 	}
7315 }
7316 
7317 static const struct got_error *
7318 tree_scroll_down(struct tog_view *view, int maxscroll)
7319 {
7320 	struct tog_tree_view_state *s = &view->state.tree;
7321 	struct got_tree_entry *next, *last;
7322 	int n = 0;
7323 
7324 	if (s->first_displayed_entry)
7325 		next = got_tree_entry_get_next(s->tree,
7326 		    s->first_displayed_entry);
7327 	else
7328 		next = got_object_tree_get_first_entry(s->tree);
7329 
7330 	last = s->last_displayed_entry;
7331 	while (next && n++ < maxscroll) {
7332 		if (last) {
7333 			s->last_displayed_entry = last;
7334 			last = got_tree_entry_get_next(s->tree, last);
7335 		}
7336 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7337 			s->first_displayed_entry = next;
7338 			next = got_tree_entry_get_next(s->tree, next);
7339 		}
7340 	}
7341 
7342 	return NULL;
7343 }
7344 
7345 static const struct got_error *
7346 tree_entry_path(char **path, struct tog_parent_trees *parents,
7347     struct got_tree_entry *te)
7348 {
7349 	const struct got_error *err = NULL;
7350 	struct tog_parent_tree *pt;
7351 	size_t len = 2; /* for leading slash and NUL */
7352 
7353 	TAILQ_FOREACH(pt, parents, entry)
7354 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7355 		    + 1 /* slash */;
7356 	if (te)
7357 		len += strlen(got_tree_entry_get_name(te));
7358 
7359 	*path = calloc(1, len);
7360 	if (path == NULL)
7361 		return got_error_from_errno("calloc");
7362 
7363 	(*path)[0] = '/';
7364 	pt = TAILQ_LAST(parents, tog_parent_trees);
7365 	while (pt) {
7366 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7367 		if (strlcat(*path, name, len) >= len) {
7368 			err = got_error(GOT_ERR_NO_SPACE);
7369 			goto done;
7370 		}
7371 		if (strlcat(*path, "/", len) >= len) {
7372 			err = got_error(GOT_ERR_NO_SPACE);
7373 			goto done;
7374 		}
7375 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7376 	}
7377 	if (te) {
7378 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7379 			err = got_error(GOT_ERR_NO_SPACE);
7380 			goto done;
7381 		}
7382 	}
7383 done:
7384 	if (err) {
7385 		free(*path);
7386 		*path = NULL;
7387 	}
7388 	return err;
7389 }
7390 
7391 static const struct got_error *
7392 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7393     struct got_tree_entry *te, struct tog_parent_trees *parents,
7394     struct got_object_id *commit_id, struct got_repository *repo)
7395 {
7396 	const struct got_error *err = NULL;
7397 	char *path;
7398 	struct tog_view *blame_view;
7399 
7400 	*new_view = NULL;
7401 
7402 	err = tree_entry_path(&path, parents, te);
7403 	if (err)
7404 		return err;
7405 
7406 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7407 	if (blame_view == NULL) {
7408 		err = got_error_from_errno("view_open");
7409 		goto done;
7410 	}
7411 
7412 	err = open_blame_view(blame_view, path, commit_id, repo);
7413 	if (err) {
7414 		if (err->code == GOT_ERR_CANCELLED)
7415 			err = NULL;
7416 		view_close(blame_view);
7417 	} else
7418 		*new_view = blame_view;
7419 done:
7420 	free(path);
7421 	return err;
7422 }
7423 
7424 static const struct got_error *
7425 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7426     struct tog_tree_view_state *s)
7427 {
7428 	struct tog_view *log_view;
7429 	const struct got_error *err = NULL;
7430 	char *path;
7431 
7432 	*new_view = NULL;
7433 
7434 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7435 	if (log_view == NULL)
7436 		return got_error_from_errno("view_open");
7437 
7438 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7439 	if (err)
7440 		return err;
7441 
7442 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7443 	    path, 0);
7444 	if (err)
7445 		view_close(log_view);
7446 	else
7447 		*new_view = log_view;
7448 	free(path);
7449 	return err;
7450 }
7451 
7452 static const struct got_error *
7453 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7454     const char *head_ref_name, struct got_repository *repo)
7455 {
7456 	const struct got_error *err = NULL;
7457 	char *commit_id_str = NULL;
7458 	struct tog_tree_view_state *s = &view->state.tree;
7459 	struct got_commit_object *commit = NULL;
7460 
7461 	TAILQ_INIT(&s->parents);
7462 	STAILQ_INIT(&s->colors);
7463 
7464 	s->commit_id = got_object_id_dup(commit_id);
7465 	if (s->commit_id == NULL) {
7466 		err = got_error_from_errno("got_object_id_dup");
7467 		goto done;
7468 	}
7469 
7470 	err = got_object_open_as_commit(&commit, repo, commit_id);
7471 	if (err)
7472 		goto done;
7473 
7474 	/*
7475 	 * The root is opened here and will be closed when the view is closed.
7476 	 * Any visited subtrees and their path-wise parents are opened and
7477 	 * closed on demand.
7478 	 */
7479 	err = got_object_open_as_tree(&s->root, repo,
7480 	    got_object_commit_get_tree_id(commit));
7481 	if (err)
7482 		goto done;
7483 	s->tree = s->root;
7484 
7485 	err = got_object_id_str(&commit_id_str, commit_id);
7486 	if (err != NULL)
7487 		goto done;
7488 
7489 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7490 		err = got_error_from_errno("asprintf");
7491 		goto done;
7492 	}
7493 
7494 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7495 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7496 	if (head_ref_name) {
7497 		s->head_ref_name = strdup(head_ref_name);
7498 		if (s->head_ref_name == NULL) {
7499 			err = got_error_from_errno("strdup");
7500 			goto done;
7501 		}
7502 	}
7503 	s->repo = repo;
7504 
7505 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7506 		err = add_color(&s->colors, "\\$$",
7507 		    TOG_COLOR_TREE_SUBMODULE,
7508 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7509 		if (err)
7510 			goto done;
7511 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7512 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7513 		if (err)
7514 			goto done;
7515 		err = add_color(&s->colors, "/$",
7516 		    TOG_COLOR_TREE_DIRECTORY,
7517 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7518 		if (err)
7519 			goto done;
7520 
7521 		err = add_color(&s->colors, "\\*$",
7522 		    TOG_COLOR_TREE_EXECUTABLE,
7523 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7524 		if (err)
7525 			goto done;
7526 
7527 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7528 		    get_color_value("TOG_COLOR_COMMIT"));
7529 		if (err)
7530 			goto done;
7531 	}
7532 
7533 	view->show = show_tree_view;
7534 	view->input = input_tree_view;
7535 	view->close = close_tree_view;
7536 	view->search_start = search_start_tree_view;
7537 	view->search_next = search_next_tree_view;
7538 done:
7539 	free(commit_id_str);
7540 	if (commit)
7541 		got_object_commit_close(commit);
7542 	if (err) {
7543 		if (view->close == NULL)
7544 			close_tree_view(view);
7545 		view_close(view);
7546 	}
7547 	return err;
7548 }
7549 
7550 static const struct got_error *
7551 close_tree_view(struct tog_view *view)
7552 {
7553 	struct tog_tree_view_state *s = &view->state.tree;
7554 
7555 	free_colors(&s->colors);
7556 	free(s->tree_label);
7557 	s->tree_label = NULL;
7558 	free(s->commit_id);
7559 	s->commit_id = NULL;
7560 	free(s->head_ref_name);
7561 	s->head_ref_name = NULL;
7562 	while (!TAILQ_EMPTY(&s->parents)) {
7563 		struct tog_parent_tree *parent;
7564 		parent = TAILQ_FIRST(&s->parents);
7565 		TAILQ_REMOVE(&s->parents, parent, entry);
7566 		if (parent->tree != s->root)
7567 			got_object_tree_close(parent->tree);
7568 		free(parent);
7569 
7570 	}
7571 	if (s->tree != NULL && s->tree != s->root)
7572 		got_object_tree_close(s->tree);
7573 	if (s->root)
7574 		got_object_tree_close(s->root);
7575 	return NULL;
7576 }
7577 
7578 static const struct got_error *
7579 search_start_tree_view(struct tog_view *view)
7580 {
7581 	struct tog_tree_view_state *s = &view->state.tree;
7582 
7583 	s->matched_entry = NULL;
7584 	return NULL;
7585 }
7586 
7587 static int
7588 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7589 {
7590 	regmatch_t regmatch;
7591 
7592 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7593 	    0) == 0;
7594 }
7595 
7596 static const struct got_error *
7597 search_next_tree_view(struct tog_view *view)
7598 {
7599 	struct tog_tree_view_state *s = &view->state.tree;
7600 	struct got_tree_entry *te = NULL;
7601 
7602 	if (!view->searching) {
7603 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7604 		return NULL;
7605 	}
7606 
7607 	if (s->matched_entry) {
7608 		if (view->searching == TOG_SEARCH_FORWARD) {
7609 			if (s->selected_entry)
7610 				te = got_tree_entry_get_next(s->tree,
7611 				    s->selected_entry);
7612 			else
7613 				te = got_object_tree_get_first_entry(s->tree);
7614 		} else {
7615 			if (s->selected_entry == NULL)
7616 				te = got_object_tree_get_last_entry(s->tree);
7617 			else
7618 				te = got_tree_entry_get_prev(s->tree,
7619 				    s->selected_entry);
7620 		}
7621 	} else {
7622 		if (s->selected_entry)
7623 			te = s->selected_entry;
7624 		else if (view->searching == TOG_SEARCH_FORWARD)
7625 			te = got_object_tree_get_first_entry(s->tree);
7626 		else
7627 			te = got_object_tree_get_last_entry(s->tree);
7628 	}
7629 
7630 	while (1) {
7631 		if (te == NULL) {
7632 			if (s->matched_entry == NULL) {
7633 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7634 				return NULL;
7635 			}
7636 			if (view->searching == TOG_SEARCH_FORWARD)
7637 				te = got_object_tree_get_first_entry(s->tree);
7638 			else
7639 				te = got_object_tree_get_last_entry(s->tree);
7640 		}
7641 
7642 		if (match_tree_entry(te, &view->regex)) {
7643 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7644 			s->matched_entry = te;
7645 			break;
7646 		}
7647 
7648 		if (view->searching == TOG_SEARCH_FORWARD)
7649 			te = got_tree_entry_get_next(s->tree, te);
7650 		else
7651 			te = got_tree_entry_get_prev(s->tree, te);
7652 	}
7653 
7654 	if (s->matched_entry) {
7655 		s->first_displayed_entry = s->matched_entry;
7656 		s->selected = 0;
7657 	}
7658 
7659 	return NULL;
7660 }
7661 
7662 static const struct got_error *
7663 show_tree_view(struct tog_view *view)
7664 {
7665 	const struct got_error *err = NULL;
7666 	struct tog_tree_view_state *s = &view->state.tree;
7667 	char *parent_path;
7668 
7669 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7670 	if (err)
7671 		return err;
7672 
7673 	err = draw_tree_entries(view, parent_path);
7674 	free(parent_path);
7675 
7676 	view_border(view);
7677 	return err;
7678 }
7679 
7680 static const struct got_error *
7681 tree_goto_line(struct tog_view *view, int nlines)
7682 {
7683 	const struct got_error		 *err = NULL;
7684 	struct tog_tree_view_state	 *s = &view->state.tree;
7685 	struct got_tree_entry		**fte, **lte, **ste;
7686 	int				  g, last, first = 1, i = 1;
7687 	int				  root = s->tree == s->root;
7688 	int				  off = root ? 1 : 2;
7689 
7690 	g = view->gline;
7691 	view->gline = 0;
7692 
7693 	if (g == 0)
7694 		g = 1;
7695 	else if (g > got_object_tree_get_nentries(s->tree))
7696 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7697 
7698 	fte = &s->first_displayed_entry;
7699 	lte = &s->last_displayed_entry;
7700 	ste = &s->selected_entry;
7701 
7702 	if (*fte != NULL) {
7703 		first = got_tree_entry_get_index(*fte);
7704 		first += off;  /* account for ".." */
7705 	}
7706 	last = got_tree_entry_get_index(*lte);
7707 	last += off;
7708 
7709 	if (g >= first && g <= last && g - first < nlines) {
7710 		s->selected = g - first;
7711 		return NULL;	/* gline is on the current page */
7712 	}
7713 
7714 	if (*ste != NULL) {
7715 		i = got_tree_entry_get_index(*ste);
7716 		i += off;
7717 	}
7718 
7719 	if (i < g) {
7720 		err = tree_scroll_down(view, g - i);
7721 		if (err)
7722 			return err;
7723 		if (got_tree_entry_get_index(*lte) >=
7724 		    got_object_tree_get_nentries(s->tree) - 1 &&
7725 		    first + s->selected < g &&
7726 		    s->selected < s->ndisplayed - 1) {
7727 			first = got_tree_entry_get_index(*fte);
7728 			first += off;
7729 			s->selected = g - first;
7730 		}
7731 	} else if (i > g)
7732 		tree_scroll_up(s, i - g);
7733 
7734 	if (g < nlines &&
7735 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7736 		s->selected = g - 1;
7737 
7738 	return NULL;
7739 }
7740 
7741 static const struct got_error *
7742 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7743 {
7744 	const struct got_error *err = NULL;
7745 	struct tog_tree_view_state *s = &view->state.tree;
7746 	struct got_tree_entry *te;
7747 	int n, nscroll = view->nlines - 3;
7748 
7749 	if (view->gline)
7750 		return tree_goto_line(view, nscroll);
7751 
7752 	switch (ch) {
7753 	case '0':
7754 	case '$':
7755 	case KEY_RIGHT:
7756 	case 'l':
7757 	case KEY_LEFT:
7758 	case 'h':
7759 		horizontal_scroll_input(view, ch);
7760 		break;
7761 	case 'i':
7762 		s->show_ids = !s->show_ids;
7763 		view->count = 0;
7764 		break;
7765 	case 'L':
7766 		view->count = 0;
7767 		if (!s->selected_entry)
7768 			break;
7769 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7770 		break;
7771 	case 'R':
7772 		view->count = 0;
7773 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7774 		break;
7775 	case 'g':
7776 	case '=':
7777 	case KEY_HOME:
7778 		s->selected = 0;
7779 		view->count = 0;
7780 		if (s->tree == s->root)
7781 			s->first_displayed_entry =
7782 			    got_object_tree_get_first_entry(s->tree);
7783 		else
7784 			s->first_displayed_entry = NULL;
7785 		break;
7786 	case 'G':
7787 	case '*':
7788 	case KEY_END: {
7789 		int eos = view->nlines - 3;
7790 
7791 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7792 			--eos;  /* border */
7793 		s->selected = 0;
7794 		view->count = 0;
7795 		te = got_object_tree_get_last_entry(s->tree);
7796 		for (n = 0; n < eos; n++) {
7797 			if (te == NULL) {
7798 				if (s->tree != s->root) {
7799 					s->first_displayed_entry = NULL;
7800 					n++;
7801 				}
7802 				break;
7803 			}
7804 			s->first_displayed_entry = te;
7805 			te = got_tree_entry_get_prev(s->tree, te);
7806 		}
7807 		if (n > 0)
7808 			s->selected = n - 1;
7809 		break;
7810 	}
7811 	case 'k':
7812 	case KEY_UP:
7813 	case CTRL('p'):
7814 		if (s->selected > 0) {
7815 			s->selected--;
7816 			break;
7817 		}
7818 		tree_scroll_up(s, 1);
7819 		if (s->selected_entry == NULL ||
7820 		    (s->tree == s->root && s->selected_entry ==
7821 		     got_object_tree_get_first_entry(s->tree)))
7822 			view->count = 0;
7823 		break;
7824 	case CTRL('u'):
7825 	case 'u':
7826 		nscroll /= 2;
7827 		/* FALL THROUGH */
7828 	case KEY_PPAGE:
7829 	case CTRL('b'):
7830 	case 'b':
7831 		if (s->tree == s->root) {
7832 			if (got_object_tree_get_first_entry(s->tree) ==
7833 			    s->first_displayed_entry)
7834 				s->selected -= MIN(s->selected, nscroll);
7835 		} else {
7836 			if (s->first_displayed_entry == NULL)
7837 				s->selected -= MIN(s->selected, nscroll);
7838 		}
7839 		tree_scroll_up(s, MAX(0, nscroll));
7840 		if (s->selected_entry == NULL ||
7841 		    (s->tree == s->root && s->selected_entry ==
7842 		     got_object_tree_get_first_entry(s->tree)))
7843 			view->count = 0;
7844 		break;
7845 	case 'j':
7846 	case KEY_DOWN:
7847 	case CTRL('n'):
7848 		if (s->selected < s->ndisplayed - 1) {
7849 			s->selected++;
7850 			break;
7851 		}
7852 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7853 		    == NULL) {
7854 			/* can't scroll any further */
7855 			view->count = 0;
7856 			break;
7857 		}
7858 		tree_scroll_down(view, 1);
7859 		break;
7860 	case CTRL('d'):
7861 	case 'd':
7862 		nscroll /= 2;
7863 		/* FALL THROUGH */
7864 	case KEY_NPAGE:
7865 	case CTRL('f'):
7866 	case 'f':
7867 	case ' ':
7868 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7869 		    == NULL) {
7870 			/* can't scroll any further; move cursor down */
7871 			if (s->selected < s->ndisplayed - 1)
7872 				s->selected += MIN(nscroll,
7873 				    s->ndisplayed - s->selected - 1);
7874 			else
7875 				view->count = 0;
7876 			break;
7877 		}
7878 		tree_scroll_down(view, nscroll);
7879 		break;
7880 	case KEY_ENTER:
7881 	case '\r':
7882 	case KEY_BACKSPACE:
7883 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7884 			struct tog_parent_tree *parent;
7885 			/* user selected '..' */
7886 			if (s->tree == s->root) {
7887 				view->count = 0;
7888 				break;
7889 			}
7890 			parent = TAILQ_FIRST(&s->parents);
7891 			TAILQ_REMOVE(&s->parents, parent,
7892 			    entry);
7893 			got_object_tree_close(s->tree);
7894 			s->tree = parent->tree;
7895 			s->first_displayed_entry =
7896 			    parent->first_displayed_entry;
7897 			s->selected_entry =
7898 			    parent->selected_entry;
7899 			s->selected = parent->selected;
7900 			if (s->selected > view->nlines - 3) {
7901 				err = offset_selection_down(view);
7902 				if (err)
7903 					break;
7904 			}
7905 			free(parent);
7906 		} else if (S_ISDIR(got_tree_entry_get_mode(
7907 		    s->selected_entry))) {
7908 			struct got_tree_object *subtree;
7909 			view->count = 0;
7910 			err = got_object_open_as_tree(&subtree, s->repo,
7911 			    got_tree_entry_get_id(s->selected_entry));
7912 			if (err)
7913 				break;
7914 			err = tree_view_visit_subtree(s, subtree);
7915 			if (err) {
7916 				got_object_tree_close(subtree);
7917 				break;
7918 			}
7919 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7920 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7921 		break;
7922 	case KEY_RESIZE:
7923 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7924 			s->selected = view->nlines - 4;
7925 		view->count = 0;
7926 		break;
7927 	default:
7928 		view->count = 0;
7929 		break;
7930 	}
7931 
7932 	return err;
7933 }
7934 
7935 __dead static void
7936 usage_tree(void)
7937 {
7938 	endwin();
7939 	fprintf(stderr,
7940 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7941 	    getprogname());
7942 	exit(1);
7943 }
7944 
7945 static const struct got_error *
7946 cmd_tree(int argc, char *argv[])
7947 {
7948 	const struct got_error *error;
7949 	struct got_repository *repo = NULL;
7950 	struct got_worktree *worktree = NULL;
7951 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7952 	struct got_object_id *commit_id = NULL;
7953 	struct got_commit_object *commit = NULL;
7954 	const char *commit_id_arg = NULL;
7955 	char *label = NULL;
7956 	struct got_reference *ref = NULL;
7957 	const char *head_ref_name = NULL;
7958 	int ch;
7959 	struct tog_view *view;
7960 	int *pack_fds = NULL;
7961 
7962 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7963 		switch (ch) {
7964 		case 'c':
7965 			commit_id_arg = optarg;
7966 			break;
7967 		case 'r':
7968 			repo_path = realpath(optarg, NULL);
7969 			if (repo_path == NULL)
7970 				return got_error_from_errno2("realpath",
7971 				    optarg);
7972 			break;
7973 		default:
7974 			usage_tree();
7975 			/* NOTREACHED */
7976 		}
7977 	}
7978 
7979 	argc -= optind;
7980 	argv += optind;
7981 
7982 	if (argc > 1)
7983 		usage_tree();
7984 
7985 	error = got_repo_pack_fds_open(&pack_fds);
7986 	if (error != NULL)
7987 		goto done;
7988 
7989 	if (repo_path == NULL) {
7990 		cwd = getcwd(NULL, 0);
7991 		if (cwd == NULL)
7992 			return got_error_from_errno("getcwd");
7993 		error = got_worktree_open(&worktree, cwd);
7994 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7995 			goto done;
7996 		if (worktree)
7997 			repo_path =
7998 			    strdup(got_worktree_get_repo_path(worktree));
7999 		else
8000 			repo_path = strdup(cwd);
8001 		if (repo_path == NULL) {
8002 			error = got_error_from_errno("strdup");
8003 			goto done;
8004 		}
8005 	}
8006 
8007 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8008 	if (error != NULL)
8009 		goto done;
8010 
8011 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8012 	    repo, worktree);
8013 	if (error)
8014 		goto done;
8015 
8016 	init_curses();
8017 
8018 	error = apply_unveil(got_repo_get_path(repo), NULL);
8019 	if (error)
8020 		goto done;
8021 
8022 	error = tog_load_refs(repo, 0);
8023 	if (error)
8024 		goto done;
8025 
8026 	if (commit_id_arg == NULL) {
8027 		error = got_repo_match_object_id(&commit_id, &label,
8028 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8029 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8030 		if (error)
8031 			goto done;
8032 		head_ref_name = label;
8033 	} else {
8034 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8035 		if (error == NULL)
8036 			head_ref_name = got_ref_get_name(ref);
8037 		else if (error->code != GOT_ERR_NOT_REF)
8038 			goto done;
8039 		error = got_repo_match_object_id(&commit_id, NULL,
8040 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8041 		if (error)
8042 			goto done;
8043 	}
8044 
8045 	error = got_object_open_as_commit(&commit, repo, commit_id);
8046 	if (error)
8047 		goto done;
8048 
8049 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8050 	if (view == NULL) {
8051 		error = got_error_from_errno("view_open");
8052 		goto done;
8053 	}
8054 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8055 	if (error)
8056 		goto done;
8057 	if (!got_path_is_root_dir(in_repo_path)) {
8058 		error = tree_view_walk_path(&view->state.tree, commit,
8059 		    in_repo_path);
8060 		if (error)
8061 			goto done;
8062 	}
8063 
8064 	if (worktree) {
8065 		/* Release work tree lock. */
8066 		got_worktree_close(worktree);
8067 		worktree = NULL;
8068 	}
8069 	error = view_loop(view);
8070 done:
8071 	free(repo_path);
8072 	free(cwd);
8073 	free(commit_id);
8074 	free(label);
8075 	if (ref)
8076 		got_ref_close(ref);
8077 	if (repo) {
8078 		const struct got_error *close_err = got_repo_close(repo);
8079 		if (error == NULL)
8080 			error = close_err;
8081 	}
8082 	if (pack_fds) {
8083 		const struct got_error *pack_err =
8084 		    got_repo_pack_fds_close(pack_fds);
8085 		if (error == NULL)
8086 			error = pack_err;
8087 	}
8088 	tog_free_refs();
8089 	return error;
8090 }
8091 
8092 static const struct got_error *
8093 ref_view_load_refs(struct tog_ref_view_state *s)
8094 {
8095 	struct got_reflist_entry *sre;
8096 	struct tog_reflist_entry *re;
8097 
8098 	s->nrefs = 0;
8099 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8100 		if (strncmp(got_ref_get_name(sre->ref),
8101 		    "refs/got/", 9) == 0 &&
8102 		    strncmp(got_ref_get_name(sre->ref),
8103 		    "refs/got/backup/", 16) != 0)
8104 			continue;
8105 
8106 		re = malloc(sizeof(*re));
8107 		if (re == NULL)
8108 			return got_error_from_errno("malloc");
8109 
8110 		re->ref = got_ref_dup(sre->ref);
8111 		if (re->ref == NULL)
8112 			return got_error_from_errno("got_ref_dup");
8113 		re->idx = s->nrefs++;
8114 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8115 	}
8116 
8117 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8118 	return NULL;
8119 }
8120 
8121 static void
8122 ref_view_free_refs(struct tog_ref_view_state *s)
8123 {
8124 	struct tog_reflist_entry *re;
8125 
8126 	while (!TAILQ_EMPTY(&s->refs)) {
8127 		re = TAILQ_FIRST(&s->refs);
8128 		TAILQ_REMOVE(&s->refs, re, entry);
8129 		got_ref_close(re->ref);
8130 		free(re);
8131 	}
8132 }
8133 
8134 static const struct got_error *
8135 open_ref_view(struct tog_view *view, struct got_repository *repo)
8136 {
8137 	const struct got_error *err = NULL;
8138 	struct tog_ref_view_state *s = &view->state.ref;
8139 
8140 	s->selected_entry = 0;
8141 	s->repo = repo;
8142 
8143 	TAILQ_INIT(&s->refs);
8144 	STAILQ_INIT(&s->colors);
8145 
8146 	err = ref_view_load_refs(s);
8147 	if (err)
8148 		goto done;
8149 
8150 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8151 		err = add_color(&s->colors, "^refs/heads/",
8152 		    TOG_COLOR_REFS_HEADS,
8153 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8154 		if (err)
8155 			goto done;
8156 
8157 		err = add_color(&s->colors, "^refs/tags/",
8158 		    TOG_COLOR_REFS_TAGS,
8159 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8160 		if (err)
8161 			goto done;
8162 
8163 		err = add_color(&s->colors, "^refs/remotes/",
8164 		    TOG_COLOR_REFS_REMOTES,
8165 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8166 		if (err)
8167 			goto done;
8168 
8169 		err = add_color(&s->colors, "^refs/got/backup/",
8170 		    TOG_COLOR_REFS_BACKUP,
8171 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8172 		if (err)
8173 			goto done;
8174 	}
8175 
8176 	view->show = show_ref_view;
8177 	view->input = input_ref_view;
8178 	view->close = close_ref_view;
8179 	view->search_start = search_start_ref_view;
8180 	view->search_next = search_next_ref_view;
8181 done:
8182 	if (err) {
8183 		if (view->close == NULL)
8184 			close_ref_view(view);
8185 		view_close(view);
8186 	}
8187 	return err;
8188 }
8189 
8190 static const struct got_error *
8191 close_ref_view(struct tog_view *view)
8192 {
8193 	struct tog_ref_view_state *s = &view->state.ref;
8194 
8195 	ref_view_free_refs(s);
8196 	free_colors(&s->colors);
8197 
8198 	return NULL;
8199 }
8200 
8201 static const struct got_error *
8202 resolve_reflist_entry(struct got_object_id **commit_id,
8203     struct tog_reflist_entry *re, struct got_repository *repo)
8204 {
8205 	const struct got_error *err = NULL;
8206 	struct got_object_id *obj_id;
8207 	struct got_tag_object *tag = NULL;
8208 	int obj_type;
8209 
8210 	*commit_id = NULL;
8211 
8212 	err = got_ref_resolve(&obj_id, repo, re->ref);
8213 	if (err)
8214 		return err;
8215 
8216 	err = got_object_get_type(&obj_type, repo, obj_id);
8217 	if (err)
8218 		goto done;
8219 
8220 	switch (obj_type) {
8221 	case GOT_OBJ_TYPE_COMMIT:
8222 		*commit_id = obj_id;
8223 		break;
8224 	case GOT_OBJ_TYPE_TAG:
8225 		err = got_object_open_as_tag(&tag, repo, obj_id);
8226 		if (err)
8227 			goto done;
8228 		free(obj_id);
8229 		err = got_object_get_type(&obj_type, repo,
8230 		    got_object_tag_get_object_id(tag));
8231 		if (err)
8232 			goto done;
8233 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8234 			err = got_error(GOT_ERR_OBJ_TYPE);
8235 			goto done;
8236 		}
8237 		*commit_id = got_object_id_dup(
8238 		    got_object_tag_get_object_id(tag));
8239 		if (*commit_id == NULL) {
8240 			err = got_error_from_errno("got_object_id_dup");
8241 			goto done;
8242 		}
8243 		break;
8244 	default:
8245 		err = got_error(GOT_ERR_OBJ_TYPE);
8246 		break;
8247 	}
8248 
8249 done:
8250 	if (tag)
8251 		got_object_tag_close(tag);
8252 	if (err) {
8253 		free(*commit_id);
8254 		*commit_id = NULL;
8255 	}
8256 	return err;
8257 }
8258 
8259 static const struct got_error *
8260 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8261     struct tog_reflist_entry *re, struct got_repository *repo)
8262 {
8263 	struct tog_view *log_view;
8264 	const struct got_error *err = NULL;
8265 	struct got_object_id *commit_id = NULL;
8266 
8267 	*new_view = NULL;
8268 
8269 	err = resolve_reflist_entry(&commit_id, re, repo);
8270 	if (err) {
8271 		if (err->code != GOT_ERR_OBJ_TYPE)
8272 			return err;
8273 		else
8274 			return NULL;
8275 	}
8276 
8277 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8278 	if (log_view == NULL) {
8279 		err = got_error_from_errno("view_open");
8280 		goto done;
8281 	}
8282 
8283 	err = open_log_view(log_view, commit_id, repo,
8284 	    got_ref_get_name(re->ref), "", 0);
8285 done:
8286 	if (err)
8287 		view_close(log_view);
8288 	else
8289 		*new_view = log_view;
8290 	free(commit_id);
8291 	return err;
8292 }
8293 
8294 static void
8295 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8296 {
8297 	struct tog_reflist_entry *re;
8298 	int i = 0;
8299 
8300 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8301 		return;
8302 
8303 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8304 	while (i++ < maxscroll) {
8305 		if (re == NULL)
8306 			break;
8307 		s->first_displayed_entry = re;
8308 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8309 	}
8310 }
8311 
8312 static const struct got_error *
8313 ref_scroll_down(struct tog_view *view, int maxscroll)
8314 {
8315 	struct tog_ref_view_state *s = &view->state.ref;
8316 	struct tog_reflist_entry *next, *last;
8317 	int n = 0;
8318 
8319 	if (s->first_displayed_entry)
8320 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8321 	else
8322 		next = TAILQ_FIRST(&s->refs);
8323 
8324 	last = s->last_displayed_entry;
8325 	while (next && n++ < maxscroll) {
8326 		if (last) {
8327 			s->last_displayed_entry = last;
8328 			last = TAILQ_NEXT(last, entry);
8329 		}
8330 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8331 			s->first_displayed_entry = next;
8332 			next = TAILQ_NEXT(next, entry);
8333 		}
8334 	}
8335 
8336 	return NULL;
8337 }
8338 
8339 static const struct got_error *
8340 search_start_ref_view(struct tog_view *view)
8341 {
8342 	struct tog_ref_view_state *s = &view->state.ref;
8343 
8344 	s->matched_entry = NULL;
8345 	return NULL;
8346 }
8347 
8348 static int
8349 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8350 {
8351 	regmatch_t regmatch;
8352 
8353 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8354 	    0) == 0;
8355 }
8356 
8357 static const struct got_error *
8358 search_next_ref_view(struct tog_view *view)
8359 {
8360 	struct tog_ref_view_state *s = &view->state.ref;
8361 	struct tog_reflist_entry *re = NULL;
8362 
8363 	if (!view->searching) {
8364 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8365 		return NULL;
8366 	}
8367 
8368 	if (s->matched_entry) {
8369 		if (view->searching == TOG_SEARCH_FORWARD) {
8370 			if (s->selected_entry)
8371 				re = TAILQ_NEXT(s->selected_entry, entry);
8372 			else
8373 				re = TAILQ_PREV(s->selected_entry,
8374 				    tog_reflist_head, entry);
8375 		} else {
8376 			if (s->selected_entry == NULL)
8377 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8378 			else
8379 				re = TAILQ_PREV(s->selected_entry,
8380 				    tog_reflist_head, entry);
8381 		}
8382 	} else {
8383 		if (s->selected_entry)
8384 			re = s->selected_entry;
8385 		else if (view->searching == TOG_SEARCH_FORWARD)
8386 			re = TAILQ_FIRST(&s->refs);
8387 		else
8388 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8389 	}
8390 
8391 	while (1) {
8392 		if (re == NULL) {
8393 			if (s->matched_entry == NULL) {
8394 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8395 				return NULL;
8396 			}
8397 			if (view->searching == TOG_SEARCH_FORWARD)
8398 				re = TAILQ_FIRST(&s->refs);
8399 			else
8400 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8401 		}
8402 
8403 		if (match_reflist_entry(re, &view->regex)) {
8404 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8405 			s->matched_entry = re;
8406 			break;
8407 		}
8408 
8409 		if (view->searching == TOG_SEARCH_FORWARD)
8410 			re = TAILQ_NEXT(re, entry);
8411 		else
8412 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8413 	}
8414 
8415 	if (s->matched_entry) {
8416 		s->first_displayed_entry = s->matched_entry;
8417 		s->selected = 0;
8418 	}
8419 
8420 	return NULL;
8421 }
8422 
8423 static const struct got_error *
8424 show_ref_view(struct tog_view *view)
8425 {
8426 	const struct got_error *err = NULL;
8427 	struct tog_ref_view_state *s = &view->state.ref;
8428 	struct tog_reflist_entry *re;
8429 	char *line = NULL;
8430 	wchar_t *wline;
8431 	struct tog_color *tc;
8432 	int width, n, scrollx;
8433 	int limit = view->nlines;
8434 
8435 	werase(view->window);
8436 
8437 	s->ndisplayed = 0;
8438 	if (view_is_hsplit_top(view))
8439 		--limit;  /* border */
8440 
8441 	if (limit == 0)
8442 		return NULL;
8443 
8444 	re = s->first_displayed_entry;
8445 
8446 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8447 	    s->nrefs) == -1)
8448 		return got_error_from_errno("asprintf");
8449 
8450 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8451 	if (err) {
8452 		free(line);
8453 		return err;
8454 	}
8455 	if (view_needs_focus_indication(view))
8456 		wstandout(view->window);
8457 	waddwstr(view->window, wline);
8458 	while (width++ < view->ncols)
8459 		waddch(view->window, ' ');
8460 	if (view_needs_focus_indication(view))
8461 		wstandend(view->window);
8462 	free(wline);
8463 	wline = NULL;
8464 	free(line);
8465 	line = NULL;
8466 	if (--limit <= 0)
8467 		return NULL;
8468 
8469 	n = 0;
8470 	view->maxx = 0;
8471 	while (re && limit > 0) {
8472 		char *line = NULL;
8473 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8474 
8475 		if (s->show_date) {
8476 			struct got_commit_object *ci;
8477 			struct got_tag_object *tag;
8478 			struct got_object_id *id;
8479 			struct tm tm;
8480 			time_t t;
8481 
8482 			err = got_ref_resolve(&id, s->repo, re->ref);
8483 			if (err)
8484 				return err;
8485 			err = got_object_open_as_tag(&tag, s->repo, id);
8486 			if (err) {
8487 				if (err->code != GOT_ERR_OBJ_TYPE) {
8488 					free(id);
8489 					return err;
8490 				}
8491 				err = got_object_open_as_commit(&ci, s->repo,
8492 				    id);
8493 				if (err) {
8494 					free(id);
8495 					return err;
8496 				}
8497 				t = got_object_commit_get_committer_time(ci);
8498 				got_object_commit_close(ci);
8499 			} else {
8500 				t = got_object_tag_get_tagger_time(tag);
8501 				got_object_tag_close(tag);
8502 			}
8503 			free(id);
8504 			if (gmtime_r(&t, &tm) == NULL)
8505 				return got_error_from_errno("gmtime_r");
8506 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8507 				return got_error(GOT_ERR_NO_SPACE);
8508 		}
8509 		if (got_ref_is_symbolic(re->ref)) {
8510 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8511 			    ymd : "", got_ref_get_name(re->ref),
8512 			    got_ref_get_symref_target(re->ref)) == -1)
8513 				return got_error_from_errno("asprintf");
8514 		} else if (s->show_ids) {
8515 			struct got_object_id *id;
8516 			char *id_str;
8517 			err = got_ref_resolve(&id, s->repo, re->ref);
8518 			if (err)
8519 				return err;
8520 			err = got_object_id_str(&id_str, id);
8521 			if (err) {
8522 				free(id);
8523 				return err;
8524 			}
8525 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8526 			    got_ref_get_name(re->ref), id_str) == -1) {
8527 				err = got_error_from_errno("asprintf");
8528 				free(id);
8529 				free(id_str);
8530 				return err;
8531 			}
8532 			free(id);
8533 			free(id_str);
8534 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8535 		    got_ref_get_name(re->ref)) == -1)
8536 			return got_error_from_errno("asprintf");
8537 
8538 		/* use full line width to determine view->maxx */
8539 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8540 		if (err) {
8541 			free(line);
8542 			return err;
8543 		}
8544 		view->maxx = MAX(view->maxx, width);
8545 		free(wline);
8546 		wline = NULL;
8547 
8548 		err = format_line(&wline, &width, &scrollx, line, view->x,
8549 		    view->ncols, 0, 0);
8550 		if (err) {
8551 			free(line);
8552 			return err;
8553 		}
8554 		if (n == s->selected) {
8555 			if (view->focussed)
8556 				wstandout(view->window);
8557 			s->selected_entry = re;
8558 		}
8559 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8560 		if (tc)
8561 			wattr_on(view->window,
8562 			    COLOR_PAIR(tc->colorpair), NULL);
8563 		waddwstr(view->window, &wline[scrollx]);
8564 		if (tc)
8565 			wattr_off(view->window,
8566 			    COLOR_PAIR(tc->colorpair), NULL);
8567 		if (width < view->ncols)
8568 			waddch(view->window, '\n');
8569 		if (n == s->selected && view->focussed)
8570 			wstandend(view->window);
8571 		free(line);
8572 		free(wline);
8573 		wline = NULL;
8574 		n++;
8575 		s->ndisplayed++;
8576 		s->last_displayed_entry = re;
8577 
8578 		limit--;
8579 		re = TAILQ_NEXT(re, entry);
8580 	}
8581 
8582 	view_border(view);
8583 	return err;
8584 }
8585 
8586 static const struct got_error *
8587 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8588     struct tog_reflist_entry *re, struct got_repository *repo)
8589 {
8590 	const struct got_error *err = NULL;
8591 	struct got_object_id *commit_id = NULL;
8592 	struct tog_view *tree_view;
8593 
8594 	*new_view = NULL;
8595 
8596 	err = resolve_reflist_entry(&commit_id, re, repo);
8597 	if (err) {
8598 		if (err->code != GOT_ERR_OBJ_TYPE)
8599 			return err;
8600 		else
8601 			return NULL;
8602 	}
8603 
8604 
8605 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8606 	if (tree_view == NULL) {
8607 		err = got_error_from_errno("view_open");
8608 		goto done;
8609 	}
8610 
8611 	err = open_tree_view(tree_view, commit_id,
8612 	    got_ref_get_name(re->ref), repo);
8613 	if (err)
8614 		goto done;
8615 
8616 	*new_view = tree_view;
8617 done:
8618 	free(commit_id);
8619 	return err;
8620 }
8621 
8622 static const struct got_error *
8623 ref_goto_line(struct tog_view *view, int nlines)
8624 {
8625 	const struct got_error		*err = NULL;
8626 	struct tog_ref_view_state	*s = &view->state.ref;
8627 	int				 g, idx = s->selected_entry->idx;
8628 
8629 	g = view->gline;
8630 	view->gline = 0;
8631 
8632 	if (g == 0)
8633 		g = 1;
8634 	else if (g > s->nrefs)
8635 		g = s->nrefs;
8636 
8637 	if (g >= s->first_displayed_entry->idx + 1 &&
8638 	    g <= s->last_displayed_entry->idx + 1 &&
8639 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8640 		s->selected = g - s->first_displayed_entry->idx - 1;
8641 		return NULL;
8642 	}
8643 
8644 	if (idx + 1 < g) {
8645 		err = ref_scroll_down(view, g - idx - 1);
8646 		if (err)
8647 			return err;
8648 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8649 		    s->first_displayed_entry->idx + s->selected < g &&
8650 		    s->selected < s->ndisplayed - 1)
8651 			s->selected = g - s->first_displayed_entry->idx - 1;
8652 	} else if (idx + 1 > g)
8653 		ref_scroll_up(s, idx - g + 1);
8654 
8655 	if (g < nlines && s->first_displayed_entry->idx == 0)
8656 		s->selected = g - 1;
8657 
8658 	return NULL;
8659 
8660 }
8661 
8662 static const struct got_error *
8663 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8664 {
8665 	const struct got_error *err = NULL;
8666 	struct tog_ref_view_state *s = &view->state.ref;
8667 	struct tog_reflist_entry *re;
8668 	int n, nscroll = view->nlines - 1;
8669 
8670 	if (view->gline)
8671 		return ref_goto_line(view, nscroll);
8672 
8673 	switch (ch) {
8674 	case '0':
8675 	case '$':
8676 	case KEY_RIGHT:
8677 	case 'l':
8678 	case KEY_LEFT:
8679 	case 'h':
8680 		horizontal_scroll_input(view, ch);
8681 		break;
8682 	case 'i':
8683 		s->show_ids = !s->show_ids;
8684 		view->count = 0;
8685 		break;
8686 	case 'm':
8687 		s->show_date = !s->show_date;
8688 		view->count = 0;
8689 		break;
8690 	case 'o':
8691 		s->sort_by_date = !s->sort_by_date;
8692 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8693 		view->count = 0;
8694 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8695 		    got_ref_cmp_by_commit_timestamp_descending :
8696 		    tog_ref_cmp_by_name, s->repo);
8697 		if (err)
8698 			break;
8699 		got_reflist_object_id_map_free(tog_refs_idmap);
8700 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8701 		    &tog_refs, s->repo);
8702 		if (err)
8703 			break;
8704 		ref_view_free_refs(s);
8705 		err = ref_view_load_refs(s);
8706 		break;
8707 	case KEY_ENTER:
8708 	case '\r':
8709 		view->count = 0;
8710 		if (!s->selected_entry)
8711 			break;
8712 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8713 		break;
8714 	case 'T':
8715 		view->count = 0;
8716 		if (!s->selected_entry)
8717 			break;
8718 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8719 		break;
8720 	case 'g':
8721 	case '=':
8722 	case KEY_HOME:
8723 		s->selected = 0;
8724 		view->count = 0;
8725 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8726 		break;
8727 	case 'G':
8728 	case '*':
8729 	case KEY_END: {
8730 		int eos = view->nlines - 1;
8731 
8732 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8733 			--eos;  /* border */
8734 		s->selected = 0;
8735 		view->count = 0;
8736 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8737 		for (n = 0; n < eos; n++) {
8738 			if (re == NULL)
8739 				break;
8740 			s->first_displayed_entry = re;
8741 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8742 		}
8743 		if (n > 0)
8744 			s->selected = n - 1;
8745 		break;
8746 	}
8747 	case 'k':
8748 	case KEY_UP:
8749 	case CTRL('p'):
8750 		if (s->selected > 0) {
8751 			s->selected--;
8752 			break;
8753 		}
8754 		ref_scroll_up(s, 1);
8755 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8756 			view->count = 0;
8757 		break;
8758 	case CTRL('u'):
8759 	case 'u':
8760 		nscroll /= 2;
8761 		/* FALL THROUGH */
8762 	case KEY_PPAGE:
8763 	case CTRL('b'):
8764 	case 'b':
8765 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8766 			s->selected -= MIN(nscroll, s->selected);
8767 		ref_scroll_up(s, MAX(0, nscroll));
8768 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8769 			view->count = 0;
8770 		break;
8771 	case 'j':
8772 	case KEY_DOWN:
8773 	case CTRL('n'):
8774 		if (s->selected < s->ndisplayed - 1) {
8775 			s->selected++;
8776 			break;
8777 		}
8778 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8779 			/* can't scroll any further */
8780 			view->count = 0;
8781 			break;
8782 		}
8783 		ref_scroll_down(view, 1);
8784 		break;
8785 	case CTRL('d'):
8786 	case 'd':
8787 		nscroll /= 2;
8788 		/* FALL THROUGH */
8789 	case KEY_NPAGE:
8790 	case CTRL('f'):
8791 	case 'f':
8792 	case ' ':
8793 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8794 			/* can't scroll any further; move cursor down */
8795 			if (s->selected < s->ndisplayed - 1)
8796 				s->selected += MIN(nscroll,
8797 				    s->ndisplayed - s->selected - 1);
8798 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8799 				s->selected += s->ndisplayed - s->selected - 1;
8800 			view->count = 0;
8801 			break;
8802 		}
8803 		ref_scroll_down(view, nscroll);
8804 		break;
8805 	case CTRL('l'):
8806 		view->count = 0;
8807 		tog_free_refs();
8808 		err = tog_load_refs(s->repo, s->sort_by_date);
8809 		if (err)
8810 			break;
8811 		ref_view_free_refs(s);
8812 		err = ref_view_load_refs(s);
8813 		break;
8814 	case KEY_RESIZE:
8815 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8816 			s->selected = view->nlines - 2;
8817 		break;
8818 	default:
8819 		view->count = 0;
8820 		break;
8821 	}
8822 
8823 	return err;
8824 }
8825 
8826 __dead static void
8827 usage_ref(void)
8828 {
8829 	endwin();
8830 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8831 	    getprogname());
8832 	exit(1);
8833 }
8834 
8835 static const struct got_error *
8836 cmd_ref(int argc, char *argv[])
8837 {
8838 	const struct got_error *error;
8839 	struct got_repository *repo = NULL;
8840 	struct got_worktree *worktree = NULL;
8841 	char *cwd = NULL, *repo_path = NULL;
8842 	int ch;
8843 	struct tog_view *view;
8844 	int *pack_fds = NULL;
8845 
8846 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8847 		switch (ch) {
8848 		case 'r':
8849 			repo_path = realpath(optarg, NULL);
8850 			if (repo_path == NULL)
8851 				return got_error_from_errno2("realpath",
8852 				    optarg);
8853 			break;
8854 		default:
8855 			usage_ref();
8856 			/* NOTREACHED */
8857 		}
8858 	}
8859 
8860 	argc -= optind;
8861 	argv += optind;
8862 
8863 	if (argc > 1)
8864 		usage_ref();
8865 
8866 	error = got_repo_pack_fds_open(&pack_fds);
8867 	if (error != NULL)
8868 		goto done;
8869 
8870 	if (repo_path == NULL) {
8871 		cwd = getcwd(NULL, 0);
8872 		if (cwd == NULL)
8873 			return got_error_from_errno("getcwd");
8874 		error = got_worktree_open(&worktree, cwd);
8875 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8876 			goto done;
8877 		if (worktree)
8878 			repo_path =
8879 			    strdup(got_worktree_get_repo_path(worktree));
8880 		else
8881 			repo_path = strdup(cwd);
8882 		if (repo_path == NULL) {
8883 			error = got_error_from_errno("strdup");
8884 			goto done;
8885 		}
8886 	}
8887 
8888 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8889 	if (error != NULL)
8890 		goto done;
8891 
8892 	init_curses();
8893 
8894 	error = apply_unveil(got_repo_get_path(repo), NULL);
8895 	if (error)
8896 		goto done;
8897 
8898 	error = tog_load_refs(repo, 0);
8899 	if (error)
8900 		goto done;
8901 
8902 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8903 	if (view == NULL) {
8904 		error = got_error_from_errno("view_open");
8905 		goto done;
8906 	}
8907 
8908 	error = open_ref_view(view, repo);
8909 	if (error)
8910 		goto done;
8911 
8912 	if (worktree) {
8913 		/* Release work tree lock. */
8914 		got_worktree_close(worktree);
8915 		worktree = NULL;
8916 	}
8917 	error = view_loop(view);
8918 done:
8919 	free(repo_path);
8920 	free(cwd);
8921 	if (repo) {
8922 		const struct got_error *close_err = got_repo_close(repo);
8923 		if (close_err)
8924 			error = close_err;
8925 	}
8926 	if (pack_fds) {
8927 		const struct got_error *pack_err =
8928 		    got_repo_pack_fds_close(pack_fds);
8929 		if (error == NULL)
8930 			error = pack_err;
8931 	}
8932 	tog_free_refs();
8933 	return error;
8934 }
8935 
8936 static const struct got_error*
8937 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8938     const char *str)
8939 {
8940 	size_t len;
8941 
8942 	if (win == NULL)
8943 		win = stdscr;
8944 
8945 	len = strlen(str);
8946 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8947 
8948 	if (focus)
8949 		wstandout(win);
8950 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8951 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8952 	if (focus)
8953 		wstandend(win);
8954 
8955 	return NULL;
8956 }
8957 
8958 static const struct got_error *
8959 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8960 {
8961 	off_t *p;
8962 
8963 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8964 	if (p == NULL) {
8965 		free(*line_offsets);
8966 		*line_offsets = NULL;
8967 		return got_error_from_errno("reallocarray");
8968 	}
8969 
8970 	*line_offsets = p;
8971 	(*line_offsets)[*nlines] = off;
8972 	++(*nlines);
8973 	return NULL;
8974 }
8975 
8976 static const struct got_error *
8977 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8978 {
8979 	*ret = 0;
8980 
8981 	for (;n > 0; --n, ++km) {
8982 		char	*t0, *t, *k;
8983 		size_t	 len = 1;
8984 
8985 		if (km->keys == NULL)
8986 			continue;
8987 
8988 		t = t0 = strdup(km->keys);
8989 		if (t0 == NULL)
8990 			return got_error_from_errno("strdup");
8991 
8992 		len += strlen(t);
8993 		while ((k = strsep(&t, " ")) != NULL)
8994 			len += strlen(k) > 1 ? 2 : 0;
8995 		free(t0);
8996 		*ret = MAX(*ret, len);
8997 	}
8998 
8999 	return NULL;
9000 }
9001 
9002 /*
9003  * Write keymap section headers, keys, and key info in km to f.
9004  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9005  * wrap control and symbolic keys in guillemets, else use <>.
9006  */
9007 static const struct got_error *
9008 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9009 {
9010 	int n, len = width;
9011 
9012 	if (km->keys) {
9013 		static const char *u8_glyph[] = {
9014 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9015 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9016 		};
9017 		char	*t0, *t, *k;
9018 		int	 cs, s, first = 1;
9019 
9020 		cs = got_locale_is_utf8();
9021 
9022 		t = t0 = strdup(km->keys);
9023 		if (t0 == NULL)
9024 			return got_error_from_errno("strdup");
9025 
9026 		len = strlen(km->keys);
9027 		while ((k = strsep(&t, " ")) != NULL) {
9028 			s = strlen(k) > 1;  /* control or symbolic key */
9029 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9030 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9031 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9032 			if (n < 0) {
9033 				free(t0);
9034 				return got_error_from_errno("fprintf");
9035 			}
9036 			first = 0;
9037 			len += s ? 2 : 0;
9038 			*off += n;
9039 		}
9040 		free(t0);
9041 	}
9042 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9043 	if (n < 0)
9044 		return got_error_from_errno("fprintf");
9045 	*off += n;
9046 
9047 	return NULL;
9048 }
9049 
9050 static const struct got_error *
9051 format_help(struct tog_help_view_state *s)
9052 {
9053 	const struct got_error		*err = NULL;
9054 	off_t				 off = 0;
9055 	int				 i, max, n, show = s->all;
9056 	static const struct tog_key_map	 km[] = {
9057 #define KEYMAP_(info, type)	{ NULL, (info), type }
9058 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9059 		GENERATE_HELP
9060 #undef KEYMAP_
9061 #undef KEY_
9062 	};
9063 
9064 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9065 	if (err)
9066 		return err;
9067 
9068 	n = nitems(km);
9069 	err = max_key_str(&max, km, n);
9070 	if (err)
9071 		return err;
9072 
9073 	for (i = 0; i < n; ++i) {
9074 		if (km[i].keys == NULL) {
9075 			show = s->all;
9076 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9077 			    km[i].type == s->type || s->all)
9078 				show = 1;
9079 		}
9080 		if (show) {
9081 			err = format_help_line(&off, s->f, &km[i], max);
9082 			if (err)
9083 				return err;
9084 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9085 			if (err)
9086 				return err;
9087 		}
9088 	}
9089 	fputc('\n', s->f);
9090 	++off;
9091 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9092 	return err;
9093 }
9094 
9095 static const struct got_error *
9096 create_help(struct tog_help_view_state *s)
9097 {
9098 	FILE			*f;
9099 	const struct got_error	*err;
9100 
9101 	free(s->line_offsets);
9102 	s->line_offsets = NULL;
9103 	s->nlines = 0;
9104 
9105 	f = got_opentemp();
9106 	if (f == NULL)
9107 		return got_error_from_errno("got_opentemp");
9108 	s->f = f;
9109 
9110 	err = format_help(s);
9111 	if (err)
9112 		return err;
9113 
9114 	if (s->f && fflush(s->f) != 0)
9115 		return got_error_from_errno("fflush");
9116 
9117 	return NULL;
9118 }
9119 
9120 static const struct got_error *
9121 search_start_help_view(struct tog_view *view)
9122 {
9123 	view->state.help.matched_line = 0;
9124 	return NULL;
9125 }
9126 
9127 static void
9128 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9129     size_t *nlines, int **first, int **last, int **match, int **selected)
9130 {
9131 	struct tog_help_view_state *s = &view->state.help;
9132 
9133 	*f = s->f;
9134 	*nlines = s->nlines;
9135 	*line_offsets = s->line_offsets;
9136 	*match = &s->matched_line;
9137 	*first = &s->first_displayed_line;
9138 	*last = &s->last_displayed_line;
9139 	*selected = &s->selected_line;
9140 }
9141 
9142 static const struct got_error *
9143 show_help_view(struct tog_view *view)
9144 {
9145 	struct tog_help_view_state	*s = &view->state.help;
9146 	const struct got_error		*err;
9147 	regmatch_t			*regmatch = &view->regmatch;
9148 	wchar_t				*wline;
9149 	char				*line;
9150 	ssize_t				 linelen;
9151 	size_t				 linesz = 0;
9152 	int				 width, nprinted = 0, rc = 0;
9153 	int				 eos = view->nlines;
9154 
9155 	if (view_is_hsplit_top(view))
9156 		--eos;  /* account for border */
9157 
9158 	s->lineno = 0;
9159 	rewind(s->f);
9160 	werase(view->window);
9161 
9162 	if (view->gline > s->nlines - 1)
9163 		view->gline = s->nlines - 1;
9164 
9165 	err = win_draw_center(view->window, 0, 0, view->ncols,
9166 	    view_needs_focus_indication(view),
9167 	    "tog help (press q to return to tog)");
9168 	if (err)
9169 		return err;
9170 	if (eos <= 1)
9171 		return NULL;
9172 	waddstr(view->window, "\n\n");
9173 	eos -= 2;
9174 
9175 	s->eof = 0;
9176 	view->maxx = 0;
9177 	line = NULL;
9178 	while (eos > 0 && nprinted < eos) {
9179 		attr_t attr = 0;
9180 
9181 		linelen = getline(&line, &linesz, s->f);
9182 		if (linelen == -1) {
9183 			if (!feof(s->f)) {
9184 				free(line);
9185 				return got_ferror(s->f, GOT_ERR_IO);
9186 			}
9187 			s->eof = 1;
9188 			break;
9189 		}
9190 		if (++s->lineno < s->first_displayed_line)
9191 			continue;
9192 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9193 			continue;
9194 		if (s->lineno == view->hiline)
9195 			attr = A_STANDOUT;
9196 
9197 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9198 		    view->x ? 1 : 0);
9199 		if (err) {
9200 			free(line);
9201 			return err;
9202 		}
9203 		view->maxx = MAX(view->maxx, width);
9204 		free(wline);
9205 		wline = NULL;
9206 
9207 		if (attr)
9208 			wattron(view->window, attr);
9209 		if (s->first_displayed_line + nprinted == s->matched_line &&
9210 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9211 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9212 			    view->window, view->x, regmatch);
9213 			if (err) {
9214 				free(line);
9215 				return err;
9216 			}
9217 		} else {
9218 			int skip;
9219 
9220 			err = format_line(&wline, &width, &skip, line,
9221 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9222 			if (err) {
9223 				free(line);
9224 				return err;
9225 			}
9226 			waddwstr(view->window, &wline[skip]);
9227 			free(wline);
9228 			wline = NULL;
9229 		}
9230 		if (s->lineno == view->hiline) {
9231 			while (width++ < view->ncols)
9232 				waddch(view->window, ' ');
9233 		} else {
9234 			if (width < view->ncols)
9235 				waddch(view->window, '\n');
9236 		}
9237 		if (attr)
9238 			wattroff(view->window, attr);
9239 		if (++nprinted == 1)
9240 			s->first_displayed_line = s->lineno;
9241 	}
9242 	free(line);
9243 	if (nprinted > 0)
9244 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9245 	else
9246 		s->last_displayed_line = s->first_displayed_line;
9247 
9248 	view_border(view);
9249 
9250 	if (s->eof) {
9251 		rc = waddnstr(view->window,
9252 		    "See the tog(1) manual page for full documentation",
9253 		    view->ncols - 1);
9254 		if (rc == ERR)
9255 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9256 	} else {
9257 		wmove(view->window, view->nlines - 1, 0);
9258 		wclrtoeol(view->window);
9259 		wstandout(view->window);
9260 		rc = waddnstr(view->window, "scroll down for more...",
9261 		    view->ncols - 1);
9262 		if (rc == ERR)
9263 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9264 		if (getcurx(view->window) < view->ncols - 6) {
9265 			rc = wprintw(view->window, "[%.0f%%]",
9266 			    100.00 * s->last_displayed_line / s->nlines);
9267 			if (rc == ERR)
9268 				return got_error_msg(GOT_ERR_IO, "wprintw");
9269 		}
9270 		wstandend(view->window);
9271 	}
9272 
9273 	return NULL;
9274 }
9275 
9276 static const struct got_error *
9277 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9278 {
9279 	struct tog_help_view_state	*s = &view->state.help;
9280 	const struct got_error		*err = NULL;
9281 	char				*line = NULL;
9282 	ssize_t				 linelen;
9283 	size_t				 linesz = 0;
9284 	int				 eos, nscroll;
9285 
9286 	eos = nscroll = view->nlines;
9287 	if (view_is_hsplit_top(view))
9288 		--eos;  /* border */
9289 
9290 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9291 
9292 	switch (ch) {
9293 	case '0':
9294 	case '$':
9295 	case KEY_RIGHT:
9296 	case 'l':
9297 	case KEY_LEFT:
9298 	case 'h':
9299 		horizontal_scroll_input(view, ch);
9300 		break;
9301 	case 'g':
9302 	case KEY_HOME:
9303 		s->first_displayed_line = 1;
9304 		view->count = 0;
9305 		break;
9306 	case 'G':
9307 	case KEY_END:
9308 		view->count = 0;
9309 		if (s->eof)
9310 			break;
9311 		s->first_displayed_line = (s->nlines - eos) + 3;
9312 		s->eof = 1;
9313 		break;
9314 	case 'k':
9315 	case KEY_UP:
9316 		if (s->first_displayed_line > 1)
9317 			--s->first_displayed_line;
9318 		else
9319 			view->count = 0;
9320 		break;
9321 	case CTRL('u'):
9322 	case 'u':
9323 		nscroll /= 2;
9324 		/* FALL THROUGH */
9325 	case KEY_PPAGE:
9326 	case CTRL('b'):
9327 	case 'b':
9328 		if (s->first_displayed_line == 1) {
9329 			view->count = 0;
9330 			break;
9331 		}
9332 		while (--nscroll > 0 && s->first_displayed_line > 1)
9333 			s->first_displayed_line--;
9334 		break;
9335 	case 'j':
9336 	case KEY_DOWN:
9337 	case CTRL('n'):
9338 		if (!s->eof)
9339 			++s->first_displayed_line;
9340 		else
9341 			view->count = 0;
9342 		break;
9343 	case CTRL('d'):
9344 	case 'd':
9345 		nscroll /= 2;
9346 		/* FALL THROUGH */
9347 	case KEY_NPAGE:
9348 	case CTRL('f'):
9349 	case 'f':
9350 	case ' ':
9351 		if (s->eof) {
9352 			view->count = 0;
9353 			break;
9354 		}
9355 		while (!s->eof && --nscroll > 0) {
9356 			linelen = getline(&line, &linesz, s->f);
9357 			s->first_displayed_line++;
9358 			if (linelen == -1) {
9359 				if (feof(s->f))
9360 					s->eof = 1;
9361 				else
9362 					err = got_ferror(s->f, GOT_ERR_IO);
9363 				break;
9364 			}
9365 		}
9366 		free(line);
9367 		break;
9368 	default:
9369 		view->count = 0;
9370 		break;
9371 	}
9372 
9373 	return err;
9374 }
9375 
9376 static const struct got_error *
9377 close_help_view(struct tog_view *view)
9378 {
9379 	struct tog_help_view_state *s = &view->state.help;
9380 
9381 	free(s->line_offsets);
9382 	s->line_offsets = NULL;
9383 	if (fclose(s->f) == EOF)
9384 		return got_error_from_errno("fclose");
9385 
9386 	return NULL;
9387 }
9388 
9389 static const struct got_error *
9390 reset_help_view(struct tog_view *view)
9391 {
9392 	struct tog_help_view_state *s = &view->state.help;
9393 
9394 
9395 	if (s->f && fclose(s->f) == EOF)
9396 		return got_error_from_errno("fclose");
9397 
9398 	wclear(view->window);
9399 	view->count = 0;
9400 	view->x = 0;
9401 	s->all = !s->all;
9402 	s->first_displayed_line = 1;
9403 	s->last_displayed_line = view->nlines;
9404 	s->matched_line = 0;
9405 
9406 	return create_help(s);
9407 }
9408 
9409 static const struct got_error *
9410 open_help_view(struct tog_view *view, struct tog_view *parent)
9411 {
9412 	const struct got_error		*err = NULL;
9413 	struct tog_help_view_state	*s = &view->state.help;
9414 
9415 	s->type = (enum tog_keymap_type)parent->type;
9416 	s->first_displayed_line = 1;
9417 	s->last_displayed_line = view->nlines;
9418 	s->selected_line = 1;
9419 
9420 	view->show = show_help_view;
9421 	view->input = input_help_view;
9422 	view->reset = reset_help_view;
9423 	view->close = close_help_view;
9424 	view->search_start = search_start_help_view;
9425 	view->search_setup = search_setup_help_view;
9426 	view->search_next = search_next_view_match;
9427 
9428 	err = create_help(s);
9429 	return err;
9430 }
9431 
9432 static const struct got_error *
9433 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9434     enum tog_view_type request, int y, int x)
9435 {
9436 	const struct got_error *err = NULL;
9437 
9438 	*new_view = NULL;
9439 
9440 	switch (request) {
9441 	case TOG_VIEW_DIFF:
9442 		if (view->type == TOG_VIEW_LOG) {
9443 			struct tog_log_view_state *s = &view->state.log;
9444 
9445 			err = open_diff_view_for_commit(new_view, y, x,
9446 			    s->selected_entry->commit, s->selected_entry->id,
9447 			    view, s->repo);
9448 		} else
9449 			return got_error_msg(GOT_ERR_NOT_IMPL,
9450 			    "parent/child view pair not supported");
9451 		break;
9452 	case TOG_VIEW_BLAME:
9453 		if (view->type == TOG_VIEW_TREE) {
9454 			struct tog_tree_view_state *s = &view->state.tree;
9455 
9456 			err = blame_tree_entry(new_view, y, x,
9457 			    s->selected_entry, &s->parents, s->commit_id,
9458 			    s->repo);
9459 		} else
9460 			return got_error_msg(GOT_ERR_NOT_IMPL,
9461 			    "parent/child view pair not supported");
9462 		break;
9463 	case TOG_VIEW_LOG:
9464 		if (view->type == TOG_VIEW_BLAME)
9465 			err = log_annotated_line(new_view, y, x,
9466 			    view->state.blame.repo, view->state.blame.id_to_log);
9467 		else if (view->type == TOG_VIEW_TREE)
9468 			err = log_selected_tree_entry(new_view, y, x,
9469 			    &view->state.tree);
9470 		else if (view->type == TOG_VIEW_REF)
9471 			err = log_ref_entry(new_view, y, x,
9472 			    view->state.ref.selected_entry,
9473 			    view->state.ref.repo);
9474 		else
9475 			return got_error_msg(GOT_ERR_NOT_IMPL,
9476 			    "parent/child view pair not supported");
9477 		break;
9478 	case TOG_VIEW_TREE:
9479 		if (view->type == TOG_VIEW_LOG)
9480 			err = browse_commit_tree(new_view, y, x,
9481 			    view->state.log.selected_entry,
9482 			    view->state.log.in_repo_path,
9483 			    view->state.log.head_ref_name,
9484 			    view->state.log.repo);
9485 		else if (view->type == TOG_VIEW_REF)
9486 			err = browse_ref_tree(new_view, y, x,
9487 			    view->state.ref.selected_entry,
9488 			    view->state.ref.repo);
9489 		else
9490 			return got_error_msg(GOT_ERR_NOT_IMPL,
9491 			    "parent/child view pair not supported");
9492 		break;
9493 	case TOG_VIEW_REF:
9494 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9495 		if (*new_view == NULL)
9496 			return got_error_from_errno("view_open");
9497 		if (view->type == TOG_VIEW_LOG)
9498 			err = open_ref_view(*new_view, view->state.log.repo);
9499 		else if (view->type == TOG_VIEW_TREE)
9500 			err = open_ref_view(*new_view, view->state.tree.repo);
9501 		else
9502 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9503 			    "parent/child view pair not supported");
9504 		if (err)
9505 			view_close(*new_view);
9506 		break;
9507 	case TOG_VIEW_HELP:
9508 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9509 		if (*new_view == NULL)
9510 			return got_error_from_errno("view_open");
9511 		err = open_help_view(*new_view, view);
9512 		if (err)
9513 			view_close(*new_view);
9514 		break;
9515 	default:
9516 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9517 	}
9518 
9519 	return err;
9520 }
9521 
9522 /*
9523  * If view was scrolled down to move the selected line into view when opening a
9524  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9525  */
9526 static void
9527 offset_selection_up(struct tog_view *view)
9528 {
9529 	switch (view->type) {
9530 	case TOG_VIEW_BLAME: {
9531 		struct tog_blame_view_state *s = &view->state.blame;
9532 		if (s->first_displayed_line == 1) {
9533 			s->selected_line = MAX(s->selected_line - view->offset,
9534 			    1);
9535 			break;
9536 		}
9537 		if (s->first_displayed_line > view->offset)
9538 			s->first_displayed_line -= view->offset;
9539 		else
9540 			s->first_displayed_line = 1;
9541 		s->selected_line += view->offset;
9542 		break;
9543 	}
9544 	case TOG_VIEW_LOG:
9545 		log_scroll_up(&view->state.log, view->offset);
9546 		view->state.log.selected += view->offset;
9547 		break;
9548 	case TOG_VIEW_REF:
9549 		ref_scroll_up(&view->state.ref, view->offset);
9550 		view->state.ref.selected += view->offset;
9551 		break;
9552 	case TOG_VIEW_TREE:
9553 		tree_scroll_up(&view->state.tree, view->offset);
9554 		view->state.tree.selected += view->offset;
9555 		break;
9556 	default:
9557 		break;
9558 	}
9559 
9560 	view->offset = 0;
9561 }
9562 
9563 /*
9564  * If the selected line is in the section of screen covered by the bottom split,
9565  * scroll down offset lines to move it into view and index its new position.
9566  */
9567 static const struct got_error *
9568 offset_selection_down(struct tog_view *view)
9569 {
9570 	const struct got_error	*err = NULL;
9571 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9572 	int			*selected = NULL;
9573 	int			 header, offset;
9574 
9575 	switch (view->type) {
9576 	case TOG_VIEW_BLAME: {
9577 		struct tog_blame_view_state *s = &view->state.blame;
9578 		header = 3;
9579 		scrolld = NULL;
9580 		if (s->selected_line > view->nlines - header) {
9581 			offset = abs(view->nlines - s->selected_line - header);
9582 			s->first_displayed_line += offset;
9583 			s->selected_line -= offset;
9584 			view->offset = offset;
9585 		}
9586 		break;
9587 	}
9588 	case TOG_VIEW_LOG: {
9589 		struct tog_log_view_state *s = &view->state.log;
9590 		scrolld = &log_scroll_down;
9591 		header = view_is_parent_view(view) ? 3 : 2;
9592 		selected = &s->selected;
9593 		break;
9594 	}
9595 	case TOG_VIEW_REF: {
9596 		struct tog_ref_view_state *s = &view->state.ref;
9597 		scrolld = &ref_scroll_down;
9598 		header = 3;
9599 		selected = &s->selected;
9600 		break;
9601 	}
9602 	case TOG_VIEW_TREE: {
9603 		struct tog_tree_view_state *s = &view->state.tree;
9604 		scrolld = &tree_scroll_down;
9605 		header = 5;
9606 		selected = &s->selected;
9607 		break;
9608 	}
9609 	default:
9610 		selected = NULL;
9611 		scrolld = NULL;
9612 		header = 0;
9613 		break;
9614 	}
9615 
9616 	if (selected && *selected > view->nlines - header) {
9617 		offset = abs(view->nlines - *selected - header);
9618 		view->offset = offset;
9619 		if (scrolld && offset) {
9620 			err = scrolld(view, offset);
9621 			*selected -= offset;
9622 		}
9623 	}
9624 
9625 	return err;
9626 }
9627 
9628 static void
9629 list_commands(FILE *fp)
9630 {
9631 	size_t i;
9632 
9633 	fprintf(fp, "commands:");
9634 	for (i = 0; i < nitems(tog_commands); i++) {
9635 		const struct tog_cmd *cmd = &tog_commands[i];
9636 		fprintf(fp, " %s", cmd->name);
9637 	}
9638 	fputc('\n', fp);
9639 }
9640 
9641 __dead static void
9642 usage(int hflag, int status)
9643 {
9644 	FILE *fp = (status == 0) ? stdout : stderr;
9645 
9646 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9647 	    getprogname());
9648 	if (hflag) {
9649 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9650 		list_commands(fp);
9651 	}
9652 	exit(status);
9653 }
9654 
9655 static char **
9656 make_argv(int argc, ...)
9657 {
9658 	va_list ap;
9659 	char **argv;
9660 	int i;
9661 
9662 	va_start(ap, argc);
9663 
9664 	argv = calloc(argc, sizeof(char *));
9665 	if (argv == NULL)
9666 		err(1, "calloc");
9667 	for (i = 0; i < argc; i++) {
9668 		argv[i] = strdup(va_arg(ap, char *));
9669 		if (argv[i] == NULL)
9670 			err(1, "strdup");
9671 	}
9672 
9673 	va_end(ap);
9674 	return argv;
9675 }
9676 
9677 /*
9678  * Try to convert 'tog path' into a 'tog log path' command.
9679  * The user could simply have mistyped the command rather than knowingly
9680  * provided a path. So check whether argv[0] can in fact be resolved
9681  * to a path in the HEAD commit and print a special error if not.
9682  * This hack is for mpi@ <3
9683  */
9684 static const struct got_error *
9685 tog_log_with_path(int argc, char *argv[])
9686 {
9687 	const struct got_error *error = NULL, *close_err;
9688 	const struct tog_cmd *cmd = NULL;
9689 	struct got_repository *repo = NULL;
9690 	struct got_worktree *worktree = NULL;
9691 	struct got_object_id *commit_id = NULL, *id = NULL;
9692 	struct got_commit_object *commit = NULL;
9693 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9694 	char *commit_id_str = NULL, **cmd_argv = NULL;
9695 	int *pack_fds = NULL;
9696 
9697 	cwd = getcwd(NULL, 0);
9698 	if (cwd == NULL)
9699 		return got_error_from_errno("getcwd");
9700 
9701 	error = got_repo_pack_fds_open(&pack_fds);
9702 	if (error != NULL)
9703 		goto done;
9704 
9705 	error = got_worktree_open(&worktree, cwd);
9706 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9707 		goto done;
9708 
9709 	if (worktree)
9710 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9711 	else
9712 		repo_path = strdup(cwd);
9713 	if (repo_path == NULL) {
9714 		error = got_error_from_errno("strdup");
9715 		goto done;
9716 	}
9717 
9718 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9719 	if (error != NULL)
9720 		goto done;
9721 
9722 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9723 	    repo, worktree);
9724 	if (error)
9725 		goto done;
9726 
9727 	error = tog_load_refs(repo, 0);
9728 	if (error)
9729 		goto done;
9730 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9731 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9732 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9733 	if (error)
9734 		goto done;
9735 
9736 	if (worktree) {
9737 		got_worktree_close(worktree);
9738 		worktree = NULL;
9739 	}
9740 
9741 	error = got_object_open_as_commit(&commit, repo, commit_id);
9742 	if (error)
9743 		goto done;
9744 
9745 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9746 	if (error) {
9747 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9748 			goto done;
9749 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9750 		    getprogname(), argv[0]);
9751 		usage(1, 1);
9752 		/* not reached */
9753 	}
9754 
9755 	error = got_object_id_str(&commit_id_str, commit_id);
9756 	if (error)
9757 		goto done;
9758 
9759 	cmd = &tog_commands[0]; /* log */
9760 	argc = 4;
9761 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9762 	error = cmd->cmd_main(argc, cmd_argv);
9763 done:
9764 	if (repo) {
9765 		close_err = got_repo_close(repo);
9766 		if (error == NULL)
9767 			error = close_err;
9768 	}
9769 	if (commit)
9770 		got_object_commit_close(commit);
9771 	if (worktree)
9772 		got_worktree_close(worktree);
9773 	if (pack_fds) {
9774 		const struct got_error *pack_err =
9775 		    got_repo_pack_fds_close(pack_fds);
9776 		if (error == NULL)
9777 			error = pack_err;
9778 	}
9779 	free(id);
9780 	free(commit_id_str);
9781 	free(commit_id);
9782 	free(cwd);
9783 	free(repo_path);
9784 	free(in_repo_path);
9785 	if (cmd_argv) {
9786 		int i;
9787 		for (i = 0; i < argc; i++)
9788 			free(cmd_argv[i]);
9789 		free(cmd_argv);
9790 	}
9791 	tog_free_refs();
9792 	return error;
9793 }
9794 
9795 int
9796 main(int argc, char *argv[])
9797 {
9798 	const struct got_error *io_err, *error = NULL;
9799 	const struct tog_cmd *cmd = NULL;
9800 	int ch, hflag = 0, Vflag = 0;
9801 	char **cmd_argv = NULL;
9802 	static const struct option longopts[] = {
9803 	    { "version", no_argument, NULL, 'V' },
9804 	    { NULL, 0, NULL, 0}
9805 	};
9806 	char *diff_algo_str = NULL;
9807 	const char *test_script_path;
9808 
9809 	setlocale(LC_CTYPE, "");
9810 
9811 	/*
9812 	 * Test mode init must happen before pledge() because "tty" will
9813 	 * not allow TTY-related ioctls to occur via regular files.
9814 	 */
9815 	test_script_path = getenv("TOG_TEST_SCRIPT");
9816 	if (test_script_path != NULL) {
9817 		error = init_mock_term(test_script_path);
9818 		if (error) {
9819 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9820 			return 1;
9821 		}
9822 	} else if (!isatty(STDIN_FILENO))
9823 		errx(1, "standard input is not a tty");
9824 
9825 #if !defined(PROFILE)
9826 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9827 	    NULL) == -1)
9828 		err(1, "pledge");
9829 #endif
9830 
9831 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9832 		switch (ch) {
9833 		case 'h':
9834 			hflag = 1;
9835 			break;
9836 		case 'V':
9837 			Vflag = 1;
9838 			break;
9839 		default:
9840 			usage(hflag, 1);
9841 			/* NOTREACHED */
9842 		}
9843 	}
9844 
9845 	argc -= optind;
9846 	argv += optind;
9847 	optind = 1;
9848 	optreset = 1;
9849 
9850 	if (Vflag) {
9851 		got_version_print_str();
9852 		return 0;
9853 	}
9854 
9855 	if (argc == 0) {
9856 		if (hflag)
9857 			usage(hflag, 0);
9858 		/* Build an argument vector which runs a default command. */
9859 		cmd = &tog_commands[0];
9860 		argc = 1;
9861 		cmd_argv = make_argv(argc, cmd->name);
9862 	} else {
9863 		size_t i;
9864 
9865 		/* Did the user specify a command? */
9866 		for (i = 0; i < nitems(tog_commands); i++) {
9867 			if (strncmp(tog_commands[i].name, argv[0],
9868 			    strlen(argv[0])) == 0) {
9869 				cmd = &tog_commands[i];
9870 				break;
9871 			}
9872 		}
9873 	}
9874 
9875 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9876 	if (diff_algo_str) {
9877 		if (strcasecmp(diff_algo_str, "patience") == 0)
9878 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9879 		if (strcasecmp(diff_algo_str, "myers") == 0)
9880 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9881 	}
9882 
9883 	if (cmd == NULL) {
9884 		if (argc != 1)
9885 			usage(0, 1);
9886 		/* No command specified; try log with a path */
9887 		error = tog_log_with_path(argc, argv);
9888 	} else {
9889 		if (hflag)
9890 			cmd->cmd_usage();
9891 		else
9892 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9893 	}
9894 
9895 	if (using_mock_io) {
9896 		io_err = tog_io_close();
9897 		if (error == NULL)
9898 			error = io_err;
9899 	}
9900 	endwin();
9901 	if (cmd_argv) {
9902 		int i;
9903 		for (i = 0; i < argc; i++)
9904 			free(cmd_argv[i]);
9905 		free(cmd_argv);
9906 	}
9907 
9908 	if (error && error->code != GOT_ERR_CANCELLED &&
9909 	    error->code != GOT_ERR_EOF &&
9910 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9911 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9912 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9913 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9914 	return 0;
9915 }