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 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.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_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 };
112 
113 enum tog_view_mode {
114 	TOG_VIEW_SPLIT_NONE,
115 	TOG_VIEW_SPLIT_VERT,
116 	TOG_VIEW_SPLIT_HRZN
117 };
118 
119 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
120 
121 #define TOG_EOF_STRING	"(END)"
122 
123 struct commit_queue_entry {
124 	TAILQ_ENTRY(commit_queue_entry) entry;
125 	struct got_object_id *id;
126 	struct got_commit_object *commit;
127 	int idx;
128 };
129 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
130 struct commit_queue {
131 	int ncommits;
132 	struct commit_queue_head head;
133 };
134 
135 struct tog_color {
136 	STAILQ_ENTRY(tog_color) entry;
137 	regex_t regex;
138 	short colorpair;
139 };
140 STAILQ_HEAD(tog_colors, tog_color);
141 
142 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
143 static struct got_reflist_object_id_map *tog_refs_idmap;
144 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
145 
146 static const struct got_error *
147 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
148     struct got_reference* re2)
149 {
150 	const char *name1 = got_ref_get_name(re1);
151 	const char *name2 = got_ref_get_name(re2);
152 	int isbackup1, isbackup2;
153 
154 	/* Sort backup refs towards the bottom of the list. */
155 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
156 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
157 	if (!isbackup1 && isbackup2) {
158 		*cmp = -1;
159 		return NULL;
160 	} else if (isbackup1 && !isbackup2) {
161 		*cmp = 1;
162 		return NULL;
163 	}
164 
165 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
166 	return NULL;
167 }
168 
169 static const struct got_error *
170 tog_load_refs(struct got_repository *repo, int sort_by_date)
171 {
172 	const struct got_error *err;
173 
174 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
175 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
176 	    repo);
177 	if (err)
178 		return err;
179 
180 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
181 	    repo);
182 }
183 
184 static void
185 tog_free_refs(void)
186 {
187 	if (tog_refs_idmap) {
188 		got_reflist_object_id_map_free(tog_refs_idmap);
189 		tog_refs_idmap = NULL;
190 	}
191 	got_ref_list_free(&tog_refs);
192 }
193 
194 static const struct got_error *
195 add_color(struct tog_colors *colors, const char *pattern,
196     int idx, short color)
197 {
198 	const struct got_error *err = NULL;
199 	struct tog_color *tc;
200 	int regerr = 0;
201 
202 	if (idx < 1 || idx > COLOR_PAIRS - 1)
203 		return NULL;
204 
205 	init_pair(idx, color, -1);
206 
207 	tc = calloc(1, sizeof(*tc));
208 	if (tc == NULL)
209 		return got_error_from_errno("calloc");
210 	regerr = regcomp(&tc->regex, pattern,
211 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
212 	if (regerr) {
213 		static char regerr_msg[512];
214 		static char err_msg[512];
215 		regerror(regerr, &tc->regex, regerr_msg,
216 		    sizeof(regerr_msg));
217 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
218 		    regerr_msg);
219 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
220 		free(tc);
221 		return err;
222 	}
223 	tc->colorpair = idx;
224 	STAILQ_INSERT_HEAD(colors, tc, entry);
225 	return NULL;
226 }
227 
228 static void
229 free_colors(struct tog_colors *colors)
230 {
231 	struct tog_color *tc;
232 
233 	while (!STAILQ_EMPTY(colors)) {
234 		tc = STAILQ_FIRST(colors);
235 		STAILQ_REMOVE_HEAD(colors, entry);
236 		regfree(&tc->regex);
237 		free(tc);
238 	}
239 }
240 
241 static struct tog_color *
242 get_color(struct tog_colors *colors, int colorpair)
243 {
244 	struct tog_color *tc = NULL;
245 
246 	STAILQ_FOREACH(tc, colors, entry) {
247 		if (tc->colorpair == colorpair)
248 			return tc;
249 	}
250 
251 	return NULL;
252 }
253 
254 static int
255 default_color_value(const char *envvar)
256 {
257 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
258 		return COLOR_MAGENTA;
259 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
260 		return COLOR_CYAN;
261 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
262 		return COLOR_YELLOW;
263 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
264 		return COLOR_GREEN;
265 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
270 		return COLOR_CYAN;
271 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
274 		return COLOR_GREEN;
275 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
276 		return COLOR_CYAN;
277 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
278 		return COLOR_YELLOW;
279 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
282 		return COLOR_MAGENTA;
283 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
284 		return COLOR_YELLOW;
285 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
286 		return COLOR_CYAN;
287 
288 	return -1;
289 }
290 
291 static int
292 get_color_value(const char *envvar)
293 {
294 	const char *val = getenv(envvar);
295 
296 	if (val == NULL)
297 		return default_color_value(envvar);
298 
299 	if (strcasecmp(val, "black") == 0)
300 		return COLOR_BLACK;
301 	if (strcasecmp(val, "red") == 0)
302 		return COLOR_RED;
303 	if (strcasecmp(val, "green") == 0)
304 		return COLOR_GREEN;
305 	if (strcasecmp(val, "yellow") == 0)
306 		return COLOR_YELLOW;
307 	if (strcasecmp(val, "blue") == 0)
308 		return COLOR_BLUE;
309 	if (strcasecmp(val, "magenta") == 0)
310 		return COLOR_MAGENTA;
311 	if (strcasecmp(val, "cyan") == 0)
312 		return COLOR_CYAN;
313 	if (strcasecmp(val, "white") == 0)
314 		return COLOR_WHITE;
315 	if (strcasecmp(val, "default") == 0)
316 		return -1;
317 
318 	return default_color_value(envvar);
319 }
320 
321 
322 struct tog_diff_view_state {
323 	struct got_object_id *id1, *id2;
324 	const char *label1, *label2;
325 	FILE *f, *f1, *f2;
326 	int fd1, fd2;
327 	int first_displayed_line;
328 	int last_displayed_line;
329 	int eof;
330 	int diff_context;
331 	int ignore_whitespace;
332 	int force_text_diff;
333 	struct got_repository *repo;
334 	struct tog_colors colors;
335 	size_t nlines;
336 	off_t *line_offsets;
337 	int matched_line;
338 	int selected_line;
339 
340 	/* passed from log or blame view; may be NULL */
341 	struct tog_view *parent_view;
342 };
343 
344 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
345 static volatile sig_atomic_t tog_thread_error;
346 
347 struct tog_log_thread_args {
348 	pthread_cond_t need_commits;
349 	pthread_cond_t commit_loaded;
350 	int commits_needed;
351 	int load_all;
352 	struct got_commit_graph *graph;
353 	struct commit_queue *commits;
354 	const char *in_repo_path;
355 	struct got_object_id *start_id;
356 	struct got_repository *repo;
357 	int *pack_fds;
358 	int log_complete;
359 	sig_atomic_t *quit;
360 	struct commit_queue_entry **first_displayed_entry;
361 	struct commit_queue_entry **selected_entry;
362 	int *searching;
363 	int *search_next_done;
364 	regex_t *regex;
365 };
366 
367 struct tog_log_view_state {
368 	struct commit_queue commits;
369 	struct commit_queue_entry *first_displayed_entry;
370 	struct commit_queue_entry *last_displayed_entry;
371 	struct commit_queue_entry *selected_entry;
372 	int selected;
373 	char *in_repo_path;
374 	char *head_ref_name;
375 	int log_branches;
376 	struct got_repository *repo;
377 	struct got_object_id *start_id;
378 	sig_atomic_t quit;
379 	pthread_t thread;
380 	struct tog_log_thread_args thread_args;
381 	struct commit_queue_entry *matched_entry;
382 	struct commit_queue_entry *search_entry;
383 	struct tog_colors colors;
384 	int use_committer;
385 };
386 
387 #define TOG_COLOR_DIFF_MINUS		1
388 #define TOG_COLOR_DIFF_PLUS		2
389 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
390 #define TOG_COLOR_DIFF_META		4
391 #define TOG_COLOR_TREE_SUBMODULE	5
392 #define TOG_COLOR_TREE_SYMLINK		6
393 #define TOG_COLOR_TREE_DIRECTORY	7
394 #define TOG_COLOR_TREE_EXECUTABLE	8
395 #define TOG_COLOR_COMMIT		9
396 #define TOG_COLOR_AUTHOR		10
397 #define TOG_COLOR_DATE			11
398 #define TOG_COLOR_REFS_HEADS		12
399 #define TOG_COLOR_REFS_TAGS		13
400 #define TOG_COLOR_REFS_REMOTES		14
401 #define TOG_COLOR_REFS_BACKUP		15
402 
403 struct tog_blame_cb_args {
404 	struct tog_blame_line *lines; /* one per line */
405 	int nlines;
406 
407 	struct tog_view *view;
408 	struct got_object_id *commit_id;
409 	int *quit;
410 };
411 
412 struct tog_blame_thread_args {
413 	const char *path;
414 	struct got_repository *repo;
415 	struct tog_blame_cb_args *cb_args;
416 	int *complete;
417 	got_cancel_cb cancel_cb;
418 	void *cancel_arg;
419 };
420 
421 struct tog_blame {
422 	FILE *f;
423 	off_t filesize;
424 	struct tog_blame_line *lines;
425 	int nlines;
426 	off_t *line_offsets;
427 	pthread_t thread;
428 	struct tog_blame_thread_args thread_args;
429 	struct tog_blame_cb_args cb_args;
430 	const char *path;
431 	int *pack_fds;
432 };
433 
434 struct tog_blame_view_state {
435 	int first_displayed_line;
436 	int last_displayed_line;
437 	int selected_line;
438 	int last_diffed_line;
439 	int blame_complete;
440 	int eof;
441 	int done;
442 	struct got_object_id_queue blamed_commits;
443 	struct got_object_qid *blamed_commit;
444 	char *path;
445 	struct got_repository *repo;
446 	struct got_object_id *commit_id;
447 	struct got_object_id *id_to_log;
448 	struct tog_blame blame;
449 	int matched_line;
450 	struct tog_colors colors;
451 };
452 
453 struct tog_parent_tree {
454 	TAILQ_ENTRY(tog_parent_tree) entry;
455 	struct got_tree_object *tree;
456 	struct got_tree_entry *first_displayed_entry;
457 	struct got_tree_entry *selected_entry;
458 	int selected;
459 };
460 
461 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
462 
463 struct tog_tree_view_state {
464 	char *tree_label;
465 	struct got_object_id *commit_id;/* commit which this tree belongs to */
466 	struct got_tree_object *root;	/* the commit's root tree entry */
467 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
468 	struct got_tree_entry *first_displayed_entry;
469 	struct got_tree_entry *last_displayed_entry;
470 	struct got_tree_entry *selected_entry;
471 	int ndisplayed, selected, show_ids;
472 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
473 	char *head_ref_name;
474 	struct got_repository *repo;
475 	struct got_tree_entry *matched_entry;
476 	struct tog_colors colors;
477 };
478 
479 struct tog_reflist_entry {
480 	TAILQ_ENTRY(tog_reflist_entry) entry;
481 	struct got_reference *ref;
482 	int idx;
483 };
484 
485 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
486 
487 struct tog_ref_view_state {
488 	struct tog_reflist_head refs;
489 	struct tog_reflist_entry *first_displayed_entry;
490 	struct tog_reflist_entry *last_displayed_entry;
491 	struct tog_reflist_entry *selected_entry;
492 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
493 	struct got_repository *repo;
494 	struct tog_reflist_entry *matched_entry;
495 	struct tog_colors colors;
496 };
497 
498 /*
499  * We implement two types of views: parent views and child views.
500  *
501  * The 'Tab' key switches focus between a parent view and its child view.
502  * Child views are shown side-by-side to their parent view, provided
503  * there is enough screen estate.
504  *
505  * When a new view is opened from within a parent view, this new view
506  * becomes a child view of the parent view, replacing any existing child.
507  *
508  * When a new view is opened from within a child view, this new view
509  * becomes a parent view which will obscure the views below until the
510  * user quits the new parent view by typing 'q'.
511  *
512  * This list of views contains parent views only.
513  * Child views are only pointed to by their parent view.
514  */
515 TAILQ_HEAD(tog_view_list_head, tog_view);
516 
517 struct tog_view {
518 	TAILQ_ENTRY(tog_view) entry;
519 	WINDOW *window;
520 	PANEL *panel;
521 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
522 	int resized_y, resized_x; /* begin_y/x based on user resizing */
523 	int maxx, x; /* max column and current start column */
524 	int lines, cols; /* copies of LINES and COLS */
525 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
526 	int ch, count; /* current keymap and count prefix */
527 	int resized; /* set when in a resize event */
528 	int focussed; /* Only set on one parent or child view at a time. */
529 	int dying;
530 	struct tog_view *parent;
531 	struct tog_view *child;
532 
533 	/*
534 	 * This flag is initially set on parent views when a new child view
535 	 * is created. It gets toggled when the 'Tab' key switches focus
536 	 * between parent and child.
537 	 * The flag indicates whether focus should be passed on to our child
538 	 * view if this parent view gets picked for focus after another parent
539 	 * view was closed. This prevents child views from losing focus in such
540 	 * situations.
541 	 */
542 	int focus_child;
543 
544 	enum tog_view_mode mode;
545 	/* type-specific state */
546 	enum tog_view_type type;
547 	union {
548 		struct tog_diff_view_state diff;
549 		struct tog_log_view_state log;
550 		struct tog_blame_view_state blame;
551 		struct tog_tree_view_state tree;
552 		struct tog_ref_view_state ref;
553 	} state;
554 
555 	const struct got_error *(*show)(struct tog_view *);
556 	const struct got_error *(*input)(struct tog_view **,
557 	    struct tog_view *, int);
558 	const struct got_error *(*reset)(struct tog_view *);
559 	const struct got_error *(*resize)(struct tog_view *, int);
560 	const struct got_error *(*close)(struct tog_view *);
561 
562 	const struct got_error *(*search_start)(struct tog_view *);
563 	const struct got_error *(*search_next)(struct tog_view *);
564 	int search_started;
565 	int searching;
566 #define TOG_SEARCH_FORWARD	1
567 #define TOG_SEARCH_BACKWARD	2
568 	int search_next_done;
569 #define TOG_SEARCH_HAVE_MORE	1
570 #define TOG_SEARCH_NO_MORE	2
571 #define TOG_SEARCH_HAVE_NONE	3
572 	regex_t regex;
573 	regmatch_t regmatch;
574 };
575 
576 static const struct got_error *open_diff_view(struct tog_view *,
577     struct got_object_id *, struct got_object_id *,
578     const char *, const char *, int, int, int, struct tog_view *,
579     struct got_repository *);
580 static const struct got_error *show_diff_view(struct tog_view *);
581 static const struct got_error *input_diff_view(struct tog_view **,
582     struct tog_view *, int);
583 static const struct got_error *reset_diff_view(struct tog_view *);
584 static const struct got_error* close_diff_view(struct tog_view *);
585 static const struct got_error *search_start_diff_view(struct tog_view *);
586 static const struct got_error *search_next_diff_view(struct tog_view *);
587 
588 static const struct got_error *open_log_view(struct tog_view *,
589     struct got_object_id *, struct got_repository *,
590     const char *, const char *, int);
591 static const struct got_error * show_log_view(struct tog_view *);
592 static const struct got_error *input_log_view(struct tog_view **,
593     struct tog_view *, int);
594 static const struct got_error *resize_log_view(struct tog_view *, int);
595 static const struct got_error *close_log_view(struct tog_view *);
596 static const struct got_error *search_start_log_view(struct tog_view *);
597 static const struct got_error *search_next_log_view(struct tog_view *);
598 
599 static const struct got_error *open_blame_view(struct tog_view *, char *,
600     struct got_object_id *, struct got_repository *);
601 static const struct got_error *show_blame_view(struct tog_view *);
602 static const struct got_error *input_blame_view(struct tog_view **,
603     struct tog_view *, int);
604 static const struct got_error *reset_blame_view(struct tog_view *);
605 static const struct got_error *close_blame_view(struct tog_view *);
606 static const struct got_error *search_start_blame_view(struct tog_view *);
607 static const struct got_error *search_next_blame_view(struct tog_view *);
608 
609 static const struct got_error *open_tree_view(struct tog_view *,
610     struct got_object_id *, const char *, struct got_repository *);
611 static const struct got_error *show_tree_view(struct tog_view *);
612 static const struct got_error *input_tree_view(struct tog_view **,
613     struct tog_view *, int);
614 static const struct got_error *close_tree_view(struct tog_view *);
615 static const struct got_error *search_start_tree_view(struct tog_view *);
616 static const struct got_error *search_next_tree_view(struct tog_view *);
617 
618 static const struct got_error *open_ref_view(struct tog_view *,
619     struct got_repository *);
620 static const struct got_error *show_ref_view(struct tog_view *);
621 static const struct got_error *input_ref_view(struct tog_view **,
622     struct tog_view *, int);
623 static const struct got_error *close_ref_view(struct tog_view *);
624 static const struct got_error *search_start_ref_view(struct tog_view *);
625 static const struct got_error *search_next_ref_view(struct tog_view *);
626 
627 static volatile sig_atomic_t tog_sigwinch_received;
628 static volatile sig_atomic_t tog_sigpipe_received;
629 static volatile sig_atomic_t tog_sigcont_received;
630 static volatile sig_atomic_t tog_sigint_received;
631 static volatile sig_atomic_t tog_sigterm_received;
632 
633 static void
634 tog_sigwinch(int signo)
635 {
636 	tog_sigwinch_received = 1;
637 }
638 
639 static void
640 tog_sigpipe(int signo)
641 {
642 	tog_sigpipe_received = 1;
643 }
644 
645 static void
646 tog_sigcont(int signo)
647 {
648 	tog_sigcont_received = 1;
649 }
650 
651 static void
652 tog_sigint(int signo)
653 {
654 	tog_sigint_received = 1;
655 }
656 
657 static void
658 tog_sigterm(int signo)
659 {
660 	tog_sigterm_received = 1;
661 }
662 
663 static int
664 tog_fatal_signal_received(void)
665 {
666 	return (tog_sigpipe_received ||
667 	    tog_sigint_received || tog_sigint_received);
668 }
669 
670 static const struct got_error *
671 view_close(struct tog_view *view)
672 {
673 	const struct got_error *err = NULL, *child_err = NULL;
674 
675 	if (view->child) {
676 		child_err = view_close(view->child);
677 		view->child = NULL;
678 	}
679 	if (view->close)
680 		err = view->close(view);
681 	if (view->panel)
682 		del_panel(view->panel);
683 	if (view->window)
684 		delwin(view->window);
685 	free(view);
686 	return err ? err : child_err;
687 }
688 
689 static struct tog_view *
690 view_open(int nlines, int ncols, int begin_y, int begin_x,
691     enum tog_view_type type)
692 {
693 	struct tog_view *view = calloc(1, sizeof(*view));
694 
695 	if (view == NULL)
696 		return NULL;
697 
698 	view->type = type;
699 	view->lines = LINES;
700 	view->cols = COLS;
701 	view->nlines = nlines ? nlines : LINES - begin_y;
702 	view->ncols = ncols ? ncols : COLS - begin_x;
703 	view->begin_y = begin_y;
704 	view->begin_x = begin_x;
705 	view->window = newwin(nlines, ncols, begin_y, begin_x);
706 	if (view->window == NULL) {
707 		view_close(view);
708 		return NULL;
709 	}
710 	view->panel = new_panel(view->window);
711 	if (view->panel == NULL ||
712 	    set_panel_userptr(view->panel, view) != OK) {
713 		view_close(view);
714 		return NULL;
715 	}
716 
717 	keypad(view->window, TRUE);
718 	return view;
719 }
720 
721 static int
722 view_split_begin_x(int begin_x)
723 {
724 	if (begin_x > 0 || COLS < 120)
725 		return 0;
726 	return (COLS - MAX(COLS / 2, 80));
727 }
728 
729 /* XXX Stub till we decide what to do. */
730 static int
731 view_split_begin_y(int lines)
732 {
733 	return lines * HSPLIT_SCALE;
734 }
735 
736 static const struct got_error *view_resize(struct tog_view *);
737 
738 static const struct got_error *
739 view_splitscreen(struct tog_view *view)
740 {
741 	const struct got_error *err = NULL;
742 
743 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
744 		if (view->resized_y && view->resized_y < view->lines)
745 			view->begin_y = view->resized_y;
746 		else
747 			view->begin_y = view_split_begin_y(view->nlines);
748 		view->begin_x = 0;
749 	} else if (!view->resized) {
750 		if (view->resized_x && view->resized_x < view->cols - 1 &&
751 		    view->cols > 119)
752 			view->begin_x = view->resized_x;
753 		else
754 			view->begin_x = view_split_begin_x(0);
755 		view->begin_y = 0;
756 	}
757 	view->nlines = LINES - view->begin_y;
758 	view->ncols = COLS - view->begin_x;
759 	view->lines = LINES;
760 	view->cols = COLS;
761 	err = view_resize(view);
762 	if (err)
763 		return err;
764 
765 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
766 		view->parent->nlines = view->begin_y;
767 
768 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
769 		return got_error_from_errno("mvwin");
770 
771 	return NULL;
772 }
773 
774 static const struct got_error *
775 view_fullscreen(struct tog_view *view)
776 {
777 	const struct got_error *err = NULL;
778 
779 	view->begin_x = 0;
780 	view->begin_y = view->resized ? view->begin_y : 0;
781 	view->nlines = view->resized ? view->nlines : LINES;
782 	view->ncols = COLS;
783 	view->lines = LINES;
784 	view->cols = COLS;
785 	err = view_resize(view);
786 	if (err)
787 		return err;
788 
789 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
790 		return got_error_from_errno("mvwin");
791 
792 	return NULL;
793 }
794 
795 static int
796 view_is_parent_view(struct tog_view *view)
797 {
798 	return view->parent == NULL;
799 }
800 
801 static int
802 view_is_splitscreen(struct tog_view *view)
803 {
804 	return view->begin_x > 0 || view->begin_y > 0;
805 }
806 
807 static int
808 view_is_fullscreen(struct tog_view *view)
809 {
810 	return view->nlines == LINES && view->ncols == COLS;
811 }
812 
813 static int
814 view_is_hsplit_top(struct tog_view *view)
815 {
816 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
817 	    view_is_splitscreen(view->child);
818 }
819 
820 static void
821 view_border(struct tog_view *view)
822 {
823 	PANEL *panel;
824 	const struct tog_view *view_above;
825 
826 	if (view->parent)
827 		return view_border(view->parent);
828 
829 	panel = panel_above(view->panel);
830 	if (panel == NULL)
831 		return;
832 
833 	view_above = panel_userptr(panel);
834 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
835 		mvwhline(view->window, view_above->begin_y - 1,
836 		    view->begin_x, got_locale_is_utf8() ?
837 		    ACS_HLINE : '-', view->ncols);
838 	else
839 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
840 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
841 }
842 
843 static const struct got_error *view_init_hsplit(struct tog_view *, int);
844 static const struct got_error *request_log_commits(struct tog_view *);
845 static const struct got_error *offset_selection_down(struct tog_view *);
846 static void offset_selection_up(struct tog_view *);
847 static void view_get_split(struct tog_view *, int *, int *);
848 
849 static const struct got_error *
850 view_resize(struct tog_view *view)
851 {
852 	const struct got_error	*err = NULL;
853 	int			 dif, nlines, ncols;
854 
855 	dif = LINES - view->lines;  /* line difference */
856 
857 	if (view->lines > LINES)
858 		nlines = view->nlines - (view->lines - LINES);
859 	else
860 		nlines = view->nlines + (LINES - view->lines);
861 	if (view->cols > COLS)
862 		ncols = view->ncols - (view->cols - COLS);
863 	else
864 		ncols = view->ncols + (COLS - view->cols);
865 
866 	if (view->child) {
867 		int hs = view->child->begin_y;
868 
869 		if (!view_is_fullscreen(view))
870 			view->child->begin_x = view_split_begin_x(view->begin_x);
871 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
872 		    view->child->begin_x == 0) {
873 			ncols = COLS;
874 
875 			view_fullscreen(view->child);
876 			if (view->child->focussed)
877 				show_panel(view->child->panel);
878 			else
879 				show_panel(view->panel);
880 		} else {
881 			ncols = view->child->begin_x;
882 
883 			view_splitscreen(view->child);
884 			show_panel(view->child->panel);
885 		}
886 		/*
887 		 * XXX This is ugly and needs to be moved into the above
888 		 * logic but "works" for now and my attempts at moving it
889 		 * break either 'tab' or 'F' key maps in horizontal splits.
890 		 */
891 		if (hs) {
892 			err = view_splitscreen(view->child);
893 			if (err)
894 				return err;
895 			if (dif < 0) { /* top split decreased */
896 				err = offset_selection_down(view);
897 				if (err)
898 					return err;
899 			}
900 			view_border(view);
901 			update_panels();
902 			doupdate();
903 			show_panel(view->child->panel);
904 			nlines = view->nlines;
905 		}
906 	} else if (view->parent == NULL)
907 		ncols = COLS;
908 
909 	if (view->resize && dif > 0) {
910 		err = view->resize(view, dif);
911 		if (err)
912 			return err;
913 	}
914 
915 	if (wresize(view->window, nlines, ncols) == ERR)
916 		return got_error_from_errno("wresize");
917 	if (replace_panel(view->panel, view->window) == ERR)
918 		return got_error_from_errno("replace_panel");
919 	wclear(view->window);
920 
921 	view->nlines = nlines;
922 	view->ncols = ncols;
923 	view->lines = LINES;
924 	view->cols = COLS;
925 
926 	return NULL;
927 }
928 
929 static const struct got_error *
930 resize_log_view(struct tog_view *view, int increase)
931 {
932 	struct tog_log_view_state	*s = &view->state.log;
933 	const struct got_error		*err = NULL;
934 	int				 n = 0;
935 
936 	if (s->selected_entry)
937 		n = s->selected_entry->idx + view->lines - s->selected;
938 
939 	/*
940 	 * Request commits to account for the increased
941 	 * height so we have enough to populate the view.
942 	 */
943 	if (s->commits.ncommits < n) {
944 		view->nscrolled = n - s->commits.ncommits + increase + 1;
945 		err = request_log_commits(view);
946 	}
947 
948 	return err;
949 }
950 
951 static void
952 view_adjust_offset(struct tog_view *view, int n)
953 {
954 	if (n == 0)
955 		return;
956 
957 	if (view->parent && view->parent->offset) {
958 		if (view->parent->offset + n >= 0)
959 			view->parent->offset += n;
960 		else
961 			view->parent->offset = 0;
962 	} else if (view->offset) {
963 		if (view->offset - n >= 0)
964 			view->offset -= n;
965 		else
966 			view->offset = 0;
967 	}
968 }
969 
970 static const struct got_error *
971 view_resize_split(struct tog_view *view, int resize)
972 {
973 	const struct got_error	*err = NULL;
974 	struct tog_view		*v = NULL;
975 
976 	if (view->parent)
977 		v = view->parent;
978 	else
979 		v = view;
980 
981 	if (!v->child || !view_is_splitscreen(v->child))
982 		return NULL;
983 
984 	v->resized = v->child->resized = resize;  /* lock for resize event */
985 
986 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
987 		if (v->child->resized_y)
988 			v->child->begin_y = v->child->resized_y;
989 		if (view->parent)
990 			v->child->begin_y -= resize;
991 		else
992 			v->child->begin_y += resize;
993 		if (v->child->begin_y < 3) {
994 			view->count = 0;
995 			v->child->begin_y = 3;
996 		} else if (v->child->begin_y > LINES - 1) {
997 			view->count = 0;
998 			v->child->begin_y = LINES - 1;
999 		}
1000 		v->ncols = COLS;
1001 		v->child->ncols = COLS;
1002 		view_adjust_offset(view, resize);
1003 		err = view_init_hsplit(v, v->child->begin_y);
1004 		if (err)
1005 			return err;
1006 		v->child->resized_y = v->child->begin_y;
1007 	} else {
1008 		if (v->child->resized_x)
1009 			v->child->begin_x = v->child->resized_x;
1010 		if (view->parent)
1011 			v->child->begin_x -= resize;
1012 		else
1013 			v->child->begin_x += resize;
1014 		if (v->child->begin_x < 11) {
1015 			view->count = 0;
1016 			v->child->begin_x = 11;
1017 		} else if (v->child->begin_x > COLS - 1) {
1018 			view->count = 0;
1019 			v->child->begin_x = COLS - 1;
1020 		}
1021 		v->child->resized_x = v->child->begin_x;
1022 	}
1023 
1024 	v->child->mode = v->mode;
1025 	v->child->nlines = v->lines - v->child->begin_y;
1026 	v->child->ncols = v->cols - v->child->begin_x;
1027 	v->focus_child = 1;
1028 
1029 	err = view_fullscreen(v);
1030 	if (err)
1031 		return err;
1032 	err = view_splitscreen(v->child);
1033 	if (err)
1034 		return err;
1035 
1036 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1037 		err = offset_selection_down(v->child);
1038 		if (err)
1039 			return err;
1040 	}
1041 
1042 	if (v->resize)
1043 		err = v->resize(v, 0);
1044 	else if (v->child->resize)
1045 		err = v->child->resize(v->child, 0);
1046 
1047 	v->resized = v->child->resized = 0;
1048 
1049 	return err;
1050 }
1051 
1052 static void
1053 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1054 {
1055 	struct tog_view *v = src->child ? src->child : src;
1056 
1057 	dst->resized_x = v->resized_x;
1058 	dst->resized_y = v->resized_y;
1059 }
1060 
1061 static const struct got_error *
1062 view_close_child(struct tog_view *view)
1063 {
1064 	const struct got_error *err = NULL;
1065 
1066 	if (view->child == NULL)
1067 		return NULL;
1068 
1069 	err = view_close(view->child);
1070 	view->child = NULL;
1071 	return err;
1072 }
1073 
1074 static const struct got_error *
1075 view_set_child(struct tog_view *view, struct tog_view *child)
1076 {
1077 	const struct got_error *err = NULL;
1078 
1079 	view->child = child;
1080 	child->parent = view;
1081 
1082 	err = view_resize(view);
1083 	if (err)
1084 		return err;
1085 
1086 	if (view->child->resized_x || view->child->resized_y)
1087 		err = view_resize_split(view, 0);
1088 
1089 	return err;
1090 }
1091 
1092 static const struct got_error *view_dispatch_request(struct tog_view **,
1093     struct tog_view *, enum tog_view_type, int, int);
1094 
1095 static const struct got_error *
1096 view_request_new(struct tog_view **requested, struct tog_view *view,
1097     enum tog_view_type request)
1098 {
1099 	struct tog_view		*new_view = NULL;
1100 	const struct got_error	*err;
1101 	int			 y = 0, x = 0;
1102 
1103 	*requested = NULL;
1104 
1105 	if (view_is_parent_view(view))
1106 		view_get_split(view, &y, &x);
1107 
1108 	err = view_dispatch_request(&new_view, view, request, y, x);
1109 	if (err)
1110 		return err;
1111 
1112 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1113 		err = view_init_hsplit(view, y);
1114 		if (err)
1115 			return err;
1116 	}
1117 
1118 	view->focussed = 0;
1119 	new_view->focussed = 1;
1120 	new_view->mode = view->mode;
1121 	new_view->nlines = view->lines - y;
1122 
1123 	if (view_is_parent_view(view)) {
1124 		view_transfer_size(new_view, view);
1125 		err = view_close_child(view);
1126 		if (err)
1127 			return err;
1128 		err = view_set_child(view, new_view);
1129 		if (err)
1130 			return err;
1131 		view->focus_child = 1;
1132 	} else
1133 		*requested = new_view;
1134 
1135 	return NULL;
1136 }
1137 
1138 static void
1139 tog_resizeterm(void)
1140 {
1141 	int cols, lines;
1142 	struct winsize size;
1143 
1144 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1145 		cols = 80;     /* Default */
1146 		lines = 24;
1147 	} else {
1148 		cols = size.ws_col;
1149 		lines = size.ws_row;
1150 	}
1151 	resize_term(lines, cols);
1152 }
1153 
1154 static const struct got_error *
1155 view_search_start(struct tog_view *view)
1156 {
1157 	const struct got_error *err = NULL;
1158 	struct tog_view *v = view;
1159 	char pattern[1024];
1160 	int ret;
1161 
1162 	if (view->search_started) {
1163 		regfree(&view->regex);
1164 		view->searching = 0;
1165 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1166 	}
1167 	view->search_started = 0;
1168 
1169 	if (view->nlines < 1)
1170 		return NULL;
1171 
1172 	if (view_is_hsplit_top(view))
1173 		v = view->child;
1174 
1175 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1176 	wclrtoeol(v->window);
1177 
1178 	nodelay(view->window, FALSE);  /* block for search term input */
1179 	nocbreak();
1180 	echo();
1181 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1182 	wrefresh(v->window);
1183 	cbreak();
1184 	noecho();
1185 	nodelay(view->window, TRUE);
1186 	if (ret == ERR)
1187 		return NULL;
1188 
1189 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1190 		err = view->search_start(view);
1191 		if (err) {
1192 			regfree(&view->regex);
1193 			return err;
1194 		}
1195 		view->search_started = 1;
1196 		view->searching = TOG_SEARCH_FORWARD;
1197 		view->search_next_done = 0;
1198 		view->search_next(view);
1199 	}
1200 
1201 	return NULL;
1202 }
1203 
1204 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1205 static const struct got_error *
1206 switch_split(struct tog_view *view)
1207 {
1208 	const struct got_error	*err = NULL;
1209 	struct tog_view		*v = NULL;
1210 
1211 	if (view->parent)
1212 		v = view->parent;
1213 	else
1214 		v = view;
1215 
1216 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1217 		v->mode = TOG_VIEW_SPLIT_VERT;
1218 	else
1219 		v->mode = TOG_VIEW_SPLIT_HRZN;
1220 
1221 	if (!v->child)
1222 		return NULL;
1223 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1224 		v->mode = TOG_VIEW_SPLIT_NONE;
1225 
1226 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1227 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1228 		v->child->begin_y = v->child->resized_y;
1229 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1230 		v->child->begin_x = v->child->resized_x;
1231 
1232 
1233 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1234 		v->ncols = COLS;
1235 		v->child->ncols = COLS;
1236 		v->child->nscrolled = LINES - v->child->nlines;
1237 
1238 		err = view_init_hsplit(v, v->child->begin_y);
1239 		if (err)
1240 			return err;
1241 	}
1242 	v->child->mode = v->mode;
1243 	v->child->nlines = v->lines - v->child->begin_y;
1244 	v->focus_child = 1;
1245 
1246 	err = view_fullscreen(v);
1247 	if (err)
1248 		return err;
1249 	err = view_splitscreen(v->child);
1250 	if (err)
1251 		return err;
1252 
1253 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1254 		v->mode = TOG_VIEW_SPLIT_VERT;
1255 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1256 		err = offset_selection_down(v);
1257 		if (err)
1258 			return err;
1259 		err = offset_selection_down(v->child);
1260 		if (err)
1261 			return err;
1262 	} else {
1263 		offset_selection_up(v);
1264 		offset_selection_up(v->child);
1265 	}
1266 	if (v->resize)
1267 		err = v->resize(v, 0);
1268 	else if (v->child->resize)
1269 		err = v->child->resize(v->child, 0);
1270 
1271 	return err;
1272 }
1273 
1274 /*
1275  * Compute view->count from numeric input. Assign total to view->count and
1276  * return first non-numeric key entered.
1277  */
1278 static int
1279 get_compound_key(struct tog_view *view, int c)
1280 {
1281 	struct tog_view	*v = view;
1282 	int		 x, n = 0;
1283 
1284 	if (view_is_hsplit_top(view))
1285 		v = view->child;
1286 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1287 		v = view->parent;
1288 
1289 	view->count = 0;
1290 	cbreak();  /* block for input */
1291 	wmove(v->window, v->nlines - 1, 0);
1292 	wclrtoeol(v->window);
1293 	waddch(v->window, ':');
1294 
1295 	do {
1296 		x = getcurx(v->window);
1297 		if (x != ERR && x < view->ncols) {
1298 			waddch(v->window, c);
1299 			wrefresh(v->window);
1300 		}
1301 
1302 		/*
1303 		 * Don't overflow. Max valid request should be the greatest
1304 		 * between the longest and total lines; cap at 10 million.
1305 		 */
1306 		if (n >= 9999999)
1307 			n = 9999999;
1308 		else
1309 			n = n * 10 + (c - '0');
1310 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1311 
1312 	/* Massage excessive or inapplicable values at the input handler. */
1313 	view->count = n;
1314 
1315 	return c;
1316 }
1317 
1318 static const struct got_error *
1319 view_input(struct tog_view **new, int *done, struct tog_view *view,
1320     struct tog_view_list_head *views)
1321 {
1322 	const struct got_error *err = NULL;
1323 	struct tog_view *v;
1324 	int ch, errcode;
1325 
1326 	*new = NULL;
1327 
1328 	/* Clear "no matches" indicator. */
1329 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1330 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1331 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1332 		view->count = 0;
1333 	}
1334 
1335 	if (view->searching && !view->search_next_done) {
1336 		errcode = pthread_mutex_unlock(&tog_mutex);
1337 		if (errcode)
1338 			return got_error_set_errno(errcode,
1339 			    "pthread_mutex_unlock");
1340 		sched_yield();
1341 		errcode = pthread_mutex_lock(&tog_mutex);
1342 		if (errcode)
1343 			return got_error_set_errno(errcode,
1344 			    "pthread_mutex_lock");
1345 		view->search_next(view);
1346 		return NULL;
1347 	}
1348 
1349 	nodelay(view->window, FALSE);
1350 	/* Allow threads to make progress while we are waiting for input. */
1351 	errcode = pthread_mutex_unlock(&tog_mutex);
1352 	if (errcode)
1353 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1354 	/* If we have an unfinished count, let C-g or backspace abort. */
1355 	if (view->count && --view->count) {
1356 		cbreak();
1357 		nodelay(view->window, TRUE);
1358 		ch = wgetch(view->window);
1359 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1360 			view->count = 0;
1361 		else
1362 			ch = view->ch;
1363 	} else {
1364 		ch = wgetch(view->window);
1365 		if (ch >= '1' && ch  <= '9')
1366 			view->ch = ch = get_compound_key(view, ch);
1367 	}
1368 	errcode = pthread_mutex_lock(&tog_mutex);
1369 	if (errcode)
1370 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1371 	nodelay(view->window, TRUE);
1372 
1373 	if (tog_sigwinch_received || tog_sigcont_received) {
1374 		tog_resizeterm();
1375 		tog_sigwinch_received = 0;
1376 		tog_sigcont_received = 0;
1377 		TAILQ_FOREACH(v, views, entry) {
1378 			err = view_resize(v);
1379 			if (err)
1380 				return err;
1381 			err = v->input(new, v, KEY_RESIZE);
1382 			if (err)
1383 				return err;
1384 			if (v->child) {
1385 				err = view_resize(v->child);
1386 				if (err)
1387 					return err;
1388 				err = v->child->input(new, v->child,
1389 				    KEY_RESIZE);
1390 				if (err)
1391 					return err;
1392 				if (v->child->resized_x || v->child->resized_y) {
1393 					err = view_resize_split(v, 0);
1394 					if (err)
1395 						return err;
1396 				}
1397 			}
1398 		}
1399 	}
1400 
1401 	switch (ch) {
1402 	case '\t':
1403 		view->count = 0;
1404 		if (view->child) {
1405 			view->focussed = 0;
1406 			view->child->focussed = 1;
1407 			view->focus_child = 1;
1408 		} else if (view->parent) {
1409 			view->focussed = 0;
1410 			view->parent->focussed = 1;
1411 			view->parent->focus_child = 0;
1412 			if (!view_is_splitscreen(view)) {
1413 				if (view->parent->resize) {
1414 					err = view->parent->resize(view->parent,
1415 					    0);
1416 					if (err)
1417 						return err;
1418 				}
1419 				offset_selection_up(view->parent);
1420 				err = view_fullscreen(view->parent);
1421 				if (err)
1422 					return err;
1423 			}
1424 		}
1425 		break;
1426 	case 'q':
1427 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1428 			if (view->parent->resize) {
1429 				/* might need more commits to fill fullscreen */
1430 				err = view->parent->resize(view->parent, 0);
1431 				if (err)
1432 					break;
1433 			}
1434 			offset_selection_up(view->parent);
1435 		}
1436 		err = view->input(new, view, ch);
1437 		view->dying = 1;
1438 		break;
1439 	case 'Q':
1440 		*done = 1;
1441 		break;
1442 	case 'F':
1443 		view->count = 0;
1444 		if (view_is_parent_view(view)) {
1445 			if (view->child == NULL)
1446 				break;
1447 			if (view_is_splitscreen(view->child)) {
1448 				view->focussed = 0;
1449 				view->child->focussed = 1;
1450 				err = view_fullscreen(view->child);
1451 			} else {
1452 				err = view_splitscreen(view->child);
1453 				if (!err)
1454 					err = view_resize_split(view, 0);
1455 			}
1456 			if (err)
1457 				break;
1458 			err = view->child->input(new, view->child,
1459 			    KEY_RESIZE);
1460 		} else {
1461 			if (view_is_splitscreen(view)) {
1462 				view->parent->focussed = 0;
1463 				view->focussed = 1;
1464 				err = view_fullscreen(view);
1465 			} else {
1466 				err = view_splitscreen(view);
1467 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1468 					err = view_resize(view->parent);
1469 				if (!err)
1470 					err = view_resize_split(view, 0);
1471 			}
1472 			if (err)
1473 				break;
1474 			err = view->input(new, view, KEY_RESIZE);
1475 		}
1476 		if (err)
1477 			break;
1478 		if (view->resize) {
1479 			err = view->resize(view, 0);
1480 			if (err)
1481 				break;
1482 		}
1483 		if (view->parent)
1484 			err = offset_selection_down(view->parent);
1485 		if (!err)
1486 			err = offset_selection_down(view);
1487 		break;
1488 	case 'S':
1489 		view->count = 0;
1490 		err = switch_split(view);
1491 		break;
1492 	case '-':
1493 		err = view_resize_split(view, -1);
1494 		break;
1495 	case '+':
1496 		err = view_resize_split(view, 1);
1497 		break;
1498 	case KEY_RESIZE:
1499 		break;
1500 	case '/':
1501 		view->count = 0;
1502 		if (view->search_start)
1503 			view_search_start(view);
1504 		else
1505 			err = view->input(new, view, ch);
1506 		break;
1507 	case 'N':
1508 	case 'n':
1509 		if (view->search_started && view->search_next) {
1510 			view->searching = (ch == 'n' ?
1511 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1512 			view->search_next_done = 0;
1513 			view->search_next(view);
1514 		} else
1515 			err = view->input(new, view, ch);
1516 		break;
1517 	case 'A':
1518 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1519 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1520 		else
1521 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1522 		TAILQ_FOREACH(v, views, entry) {
1523 			if (v->reset) {
1524 				err = v->reset(v);
1525 				if (err)
1526 					return err;
1527 			}
1528 			if (v->child && v->child->reset) {
1529 				err = v->child->reset(v->child);
1530 				if (err)
1531 					return err;
1532 			}
1533 		}
1534 		break;
1535 	default:
1536 		err = view->input(new, view, ch);
1537 		break;
1538 	}
1539 
1540 	return err;
1541 }
1542 
1543 static int
1544 view_needs_focus_indication(struct tog_view *view)
1545 {
1546 	if (view_is_parent_view(view)) {
1547 		if (view->child == NULL || view->child->focussed)
1548 			return 0;
1549 		if (!view_is_splitscreen(view->child))
1550 			return 0;
1551 	} else if (!view_is_splitscreen(view))
1552 		return 0;
1553 
1554 	return view->focussed;
1555 }
1556 
1557 static const struct got_error *
1558 view_loop(struct tog_view *view)
1559 {
1560 	const struct got_error *err = NULL;
1561 	struct tog_view_list_head views;
1562 	struct tog_view *new_view;
1563 	char *mode;
1564 	int fast_refresh = 10;
1565 	int done = 0, errcode;
1566 
1567 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1568 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1569 		view->mode = TOG_VIEW_SPLIT_VERT;
1570 	else
1571 		view->mode = TOG_VIEW_SPLIT_HRZN;
1572 
1573 	errcode = pthread_mutex_lock(&tog_mutex);
1574 	if (errcode)
1575 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1576 
1577 	TAILQ_INIT(&views);
1578 	TAILQ_INSERT_HEAD(&views, view, entry);
1579 
1580 	view->focussed = 1;
1581 	err = view->show(view);
1582 	if (err)
1583 		return err;
1584 	update_panels();
1585 	doupdate();
1586 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1587 	    !tog_fatal_signal_received()) {
1588 		/* Refresh fast during initialization, then become slower. */
1589 		if (fast_refresh && fast_refresh-- == 0)
1590 			halfdelay(10); /* switch to once per second */
1591 
1592 		err = view_input(&new_view, &done, view, &views);
1593 		if (err)
1594 			break;
1595 		if (view->dying) {
1596 			struct tog_view *v, *prev = NULL;
1597 
1598 			if (view_is_parent_view(view))
1599 				prev = TAILQ_PREV(view, tog_view_list_head,
1600 				    entry);
1601 			else if (view->parent)
1602 				prev = view->parent;
1603 
1604 			if (view->parent) {
1605 				view->parent->child = NULL;
1606 				view->parent->focus_child = 0;
1607 				/* Restore fullscreen line height. */
1608 				view->parent->nlines = view->parent->lines;
1609 				err = view_resize(view->parent);
1610 				if (err)
1611 					break;
1612 				/* Make resized splits persist. */
1613 				view_transfer_size(view->parent, view);
1614 			} else
1615 				TAILQ_REMOVE(&views, view, entry);
1616 
1617 			err = view_close(view);
1618 			if (err)
1619 				goto done;
1620 
1621 			view = NULL;
1622 			TAILQ_FOREACH(v, &views, entry) {
1623 				if (v->focussed)
1624 					break;
1625 			}
1626 			if (view == NULL && new_view == NULL) {
1627 				/* No view has focus. Try to pick one. */
1628 				if (prev)
1629 					view = prev;
1630 				else if (!TAILQ_EMPTY(&views)) {
1631 					view = TAILQ_LAST(&views,
1632 					    tog_view_list_head);
1633 				}
1634 				if (view) {
1635 					if (view->focus_child) {
1636 						view->child->focussed = 1;
1637 						view = view->child;
1638 					} else
1639 						view->focussed = 1;
1640 				}
1641 			}
1642 		}
1643 		if (new_view) {
1644 			struct tog_view *v, *t;
1645 			/* Only allow one parent view per type. */
1646 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1647 				if (v->type != new_view->type)
1648 					continue;
1649 				TAILQ_REMOVE(&views, v, entry);
1650 				err = view_close(v);
1651 				if (err)
1652 					goto done;
1653 				break;
1654 			}
1655 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1656 			view = new_view;
1657 		}
1658 		if (view) {
1659 			if (view_is_parent_view(view)) {
1660 				if (view->child && view->child->focussed)
1661 					view = view->child;
1662 			} else {
1663 				if (view->parent && view->parent->focussed)
1664 					view = view->parent;
1665 			}
1666 			show_panel(view->panel);
1667 			if (view->child && view_is_splitscreen(view->child))
1668 				show_panel(view->child->panel);
1669 			if (view->parent && view_is_splitscreen(view)) {
1670 				err = view->parent->show(view->parent);
1671 				if (err)
1672 					goto done;
1673 			}
1674 			err = view->show(view);
1675 			if (err)
1676 				goto done;
1677 			if (view->child) {
1678 				err = view->child->show(view->child);
1679 				if (err)
1680 					goto done;
1681 			}
1682 			update_panels();
1683 			doupdate();
1684 		}
1685 	}
1686 done:
1687 	while (!TAILQ_EMPTY(&views)) {
1688 		const struct got_error *close_err;
1689 		view = TAILQ_FIRST(&views);
1690 		TAILQ_REMOVE(&views, view, entry);
1691 		close_err = view_close(view);
1692 		if (close_err && err == NULL)
1693 			err = close_err;
1694 	}
1695 
1696 	errcode = pthread_mutex_unlock(&tog_mutex);
1697 	if (errcode && err == NULL)
1698 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1699 
1700 	return err;
1701 }
1702 
1703 __dead static void
1704 usage_log(void)
1705 {
1706 	endwin();
1707 	fprintf(stderr,
1708 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1709 	    getprogname());
1710 	exit(1);
1711 }
1712 
1713 /* Create newly allocated wide-character string equivalent to a byte string. */
1714 static const struct got_error *
1715 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1716 {
1717 	char *vis = NULL;
1718 	const struct got_error *err = NULL;
1719 
1720 	*ws = NULL;
1721 	*wlen = mbstowcs(NULL, s, 0);
1722 	if (*wlen == (size_t)-1) {
1723 		int vislen;
1724 		if (errno != EILSEQ)
1725 			return got_error_from_errno("mbstowcs");
1726 
1727 		/* byte string invalid in current encoding; try to "fix" it */
1728 		err = got_mbsavis(&vis, &vislen, s);
1729 		if (err)
1730 			return err;
1731 		*wlen = mbstowcs(NULL, vis, 0);
1732 		if (*wlen == (size_t)-1) {
1733 			err = got_error_from_errno("mbstowcs"); /* give up */
1734 			goto done;
1735 		}
1736 	}
1737 
1738 	*ws = calloc(*wlen + 1, sizeof(**ws));
1739 	if (*ws == NULL) {
1740 		err = got_error_from_errno("calloc");
1741 		goto done;
1742 	}
1743 
1744 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1745 		err = got_error_from_errno("mbstowcs");
1746 done:
1747 	free(vis);
1748 	if (err) {
1749 		free(*ws);
1750 		*ws = NULL;
1751 		*wlen = 0;
1752 	}
1753 	return err;
1754 }
1755 
1756 static const struct got_error *
1757 expand_tab(char **ptr, const char *src)
1758 {
1759 	char	*dst;
1760 	size_t	 len, n, idx = 0, sz = 0;
1761 
1762 	*ptr = NULL;
1763 	n = len = strlen(src);
1764 	dst = malloc(n + 1);
1765 	if (dst == NULL)
1766 		return got_error_from_errno("malloc");
1767 
1768 	while (idx < len && src[idx]) {
1769 		const char c = src[idx];
1770 
1771 		if (c == '\t') {
1772 			size_t nb = TABSIZE - sz % TABSIZE;
1773 			char *p;
1774 
1775 			p = realloc(dst, n + nb);
1776 			if (p == NULL) {
1777 				free(dst);
1778 				return got_error_from_errno("realloc");
1779 
1780 			}
1781 			dst = p;
1782 			n += nb;
1783 			memset(dst + sz, ' ', nb);
1784 			sz += nb;
1785 		} else
1786 			dst[sz++] = src[idx];
1787 		++idx;
1788 	}
1789 
1790 	dst[sz] = '\0';
1791 	*ptr = dst;
1792 	return NULL;
1793 }
1794 
1795 /*
1796  * Advance at most n columns from wline starting at offset off.
1797  * Return the index to the first character after the span operation.
1798  * Return the combined column width of all spanned wide character in
1799  * *rcol.
1800  */
1801 static int
1802 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1803 {
1804 	int width, i, cols = 0;
1805 
1806 	if (n == 0) {
1807 		*rcol = cols;
1808 		return off;
1809 	}
1810 
1811 	for (i = off; wline[i] != L'\0'; ++i) {
1812 		if (wline[i] == L'\t')
1813 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1814 		else
1815 			width = wcwidth(wline[i]);
1816 
1817 		if (width == -1) {
1818 			width = 1;
1819 			wline[i] = L'.';
1820 		}
1821 
1822 		if (cols + width > n)
1823 			break;
1824 		cols += width;
1825 	}
1826 
1827 	*rcol = cols;
1828 	return i;
1829 }
1830 
1831 /*
1832  * Format a line for display, ensuring that it won't overflow a width limit.
1833  * With scrolling, the width returned refers to the scrolled version of the
1834  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1835  */
1836 static const struct got_error *
1837 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1838     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1839 {
1840 	const struct got_error *err = NULL;
1841 	int cols;
1842 	wchar_t *wline = NULL;
1843 	char *exstr = NULL;
1844 	size_t wlen;
1845 	int i, scrollx;
1846 
1847 	*wlinep = NULL;
1848 	*widthp = 0;
1849 
1850 	if (expand) {
1851 		err = expand_tab(&exstr, line);
1852 		if (err)
1853 			return err;
1854 	}
1855 
1856 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1857 	free(exstr);
1858 	if (err)
1859 		return err;
1860 
1861 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1862 
1863 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1864 		wline[wlen - 1] = L'\0';
1865 		wlen--;
1866 	}
1867 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1868 		wline[wlen - 1] = L'\0';
1869 		wlen--;
1870 	}
1871 
1872 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1873 	wline[i] = L'\0';
1874 
1875 	if (widthp)
1876 		*widthp = cols;
1877 	if (scrollxp)
1878 		*scrollxp = scrollx;
1879 	if (err)
1880 		free(wline);
1881 	else
1882 		*wlinep = wline;
1883 	return err;
1884 }
1885 
1886 static const struct got_error*
1887 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1888     struct got_object_id *id, struct got_repository *repo)
1889 {
1890 	static const struct got_error *err = NULL;
1891 	struct got_reflist_entry *re;
1892 	char *s;
1893 	const char *name;
1894 
1895 	*refs_str = NULL;
1896 
1897 	TAILQ_FOREACH(re, refs, entry) {
1898 		struct got_tag_object *tag = NULL;
1899 		struct got_object_id *ref_id;
1900 		int cmp;
1901 
1902 		name = got_ref_get_name(re->ref);
1903 		if (strcmp(name, GOT_REF_HEAD) == 0)
1904 			continue;
1905 		if (strncmp(name, "refs/", 5) == 0)
1906 			name += 5;
1907 		if (strncmp(name, "got/", 4) == 0 &&
1908 		    strncmp(name, "got/backup/", 11) != 0)
1909 			continue;
1910 		if (strncmp(name, "heads/", 6) == 0)
1911 			name += 6;
1912 		if (strncmp(name, "remotes/", 8) == 0) {
1913 			name += 8;
1914 			s = strstr(name, "/" GOT_REF_HEAD);
1915 			if (s != NULL && s[strlen(s)] == '\0')
1916 				continue;
1917 		}
1918 		err = got_ref_resolve(&ref_id, repo, re->ref);
1919 		if (err)
1920 			break;
1921 		if (strncmp(name, "tags/", 5) == 0) {
1922 			err = got_object_open_as_tag(&tag, repo, ref_id);
1923 			if (err) {
1924 				if (err->code != GOT_ERR_OBJ_TYPE) {
1925 					free(ref_id);
1926 					break;
1927 				}
1928 				/* Ref points at something other than a tag. */
1929 				err = NULL;
1930 				tag = NULL;
1931 			}
1932 		}
1933 		cmp = got_object_id_cmp(tag ?
1934 		    got_object_tag_get_object_id(tag) : ref_id, id);
1935 		free(ref_id);
1936 		if (tag)
1937 			got_object_tag_close(tag);
1938 		if (cmp != 0)
1939 			continue;
1940 		s = *refs_str;
1941 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1942 		    s ? ", " : "", name) == -1) {
1943 			err = got_error_from_errno("asprintf");
1944 			free(s);
1945 			*refs_str = NULL;
1946 			break;
1947 		}
1948 		free(s);
1949 	}
1950 
1951 	return err;
1952 }
1953 
1954 static const struct got_error *
1955 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1956     int col_tab_align)
1957 {
1958 	char *smallerthan;
1959 
1960 	smallerthan = strchr(author, '<');
1961 	if (smallerthan && smallerthan[1] != '\0')
1962 		author = smallerthan + 1;
1963 	author[strcspn(author, "@>")] = '\0';
1964 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1965 	    col_tab_align, 0);
1966 }
1967 
1968 static const struct got_error *
1969 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1970     struct got_object_id *id, const size_t date_display_cols,
1971     int author_display_cols)
1972 {
1973 	struct tog_log_view_state *s = &view->state.log;
1974 	const struct got_error *err = NULL;
1975 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1976 	char *logmsg0 = NULL, *logmsg = NULL;
1977 	char *author = NULL;
1978 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1979 	int author_width, logmsg_width;
1980 	char *newline, *line = NULL;
1981 	int col, limit, scrollx;
1982 	const int avail = view->ncols;
1983 	struct tm tm;
1984 	time_t committer_time;
1985 	struct tog_color *tc;
1986 
1987 	committer_time = got_object_commit_get_committer_time(commit);
1988 	if (gmtime_r(&committer_time, &tm) == NULL)
1989 		return got_error_from_errno("gmtime_r");
1990 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1991 		return got_error(GOT_ERR_NO_SPACE);
1992 
1993 	if (avail <= date_display_cols)
1994 		limit = MIN(sizeof(datebuf) - 1, avail);
1995 	else
1996 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1997 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1998 	if (tc)
1999 		wattr_on(view->window,
2000 		    COLOR_PAIR(tc->colorpair), NULL);
2001 	waddnstr(view->window, datebuf, limit);
2002 	if (tc)
2003 		wattr_off(view->window,
2004 		    COLOR_PAIR(tc->colorpair), NULL);
2005 	col = limit;
2006 	if (col > avail)
2007 		goto done;
2008 
2009 	if (avail >= 120) {
2010 		char *id_str;
2011 		err = got_object_id_str(&id_str, id);
2012 		if (err)
2013 			goto done;
2014 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2015 		if (tc)
2016 			wattr_on(view->window,
2017 			    COLOR_PAIR(tc->colorpair), NULL);
2018 		wprintw(view->window, "%.8s ", id_str);
2019 		if (tc)
2020 			wattr_off(view->window,
2021 			    COLOR_PAIR(tc->colorpair), NULL);
2022 		free(id_str);
2023 		col += 9;
2024 		if (col > avail)
2025 			goto done;
2026 	}
2027 
2028 	if (s->use_committer)
2029 		author = strdup(got_object_commit_get_committer(commit));
2030 	else
2031 		author = strdup(got_object_commit_get_author(commit));
2032 	if (author == NULL) {
2033 		err = got_error_from_errno("strdup");
2034 		goto done;
2035 	}
2036 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2037 	if (err)
2038 		goto done;
2039 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2040 	if (tc)
2041 		wattr_on(view->window,
2042 		    COLOR_PAIR(tc->colorpair), NULL);
2043 	waddwstr(view->window, wauthor);
2044 	if (tc)
2045 		wattr_off(view->window,
2046 		    COLOR_PAIR(tc->colorpair), NULL);
2047 	col += author_width;
2048 	while (col < avail && author_width < author_display_cols + 2) {
2049 		waddch(view->window, ' ');
2050 		col++;
2051 		author_width++;
2052 	}
2053 	if (col > avail)
2054 		goto done;
2055 
2056 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2057 	if (err)
2058 		goto done;
2059 	logmsg = logmsg0;
2060 	while (*logmsg == '\n')
2061 		logmsg++;
2062 	newline = strchr(logmsg, '\n');
2063 	if (newline)
2064 		*newline = '\0';
2065 	limit = avail - col;
2066 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2067 		limit--;	/* for the border */
2068 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2069 	    limit, col, 1);
2070 	if (err)
2071 		goto done;
2072 	waddwstr(view->window, &wlogmsg[scrollx]);
2073 	col += MAX(logmsg_width, 0);
2074 	while (col < avail) {
2075 		waddch(view->window, ' ');
2076 		col++;
2077 	}
2078 done:
2079 	free(logmsg0);
2080 	free(wlogmsg);
2081 	free(author);
2082 	free(wauthor);
2083 	free(line);
2084 	return err;
2085 }
2086 
2087 static struct commit_queue_entry *
2088 alloc_commit_queue_entry(struct got_commit_object *commit,
2089     struct got_object_id *id)
2090 {
2091 	struct commit_queue_entry *entry;
2092 
2093 	entry = calloc(1, sizeof(*entry));
2094 	if (entry == NULL)
2095 		return NULL;
2096 
2097 	entry->id = id;
2098 	entry->commit = commit;
2099 	return entry;
2100 }
2101 
2102 static void
2103 pop_commit(struct commit_queue *commits)
2104 {
2105 	struct commit_queue_entry *entry;
2106 
2107 	entry = TAILQ_FIRST(&commits->head);
2108 	TAILQ_REMOVE(&commits->head, entry, entry);
2109 	got_object_commit_close(entry->commit);
2110 	commits->ncommits--;
2111 	/* Don't free entry->id! It is owned by the commit graph. */
2112 	free(entry);
2113 }
2114 
2115 static void
2116 free_commits(struct commit_queue *commits)
2117 {
2118 	while (!TAILQ_EMPTY(&commits->head))
2119 		pop_commit(commits);
2120 }
2121 
2122 static const struct got_error *
2123 match_commit(int *have_match, struct got_object_id *id,
2124     struct got_commit_object *commit, regex_t *regex)
2125 {
2126 	const struct got_error *err = NULL;
2127 	regmatch_t regmatch;
2128 	char *id_str = NULL, *logmsg = NULL;
2129 
2130 	*have_match = 0;
2131 
2132 	err = got_object_id_str(&id_str, id);
2133 	if (err)
2134 		return err;
2135 
2136 	err = got_object_commit_get_logmsg(&logmsg, commit);
2137 	if (err)
2138 		goto done;
2139 
2140 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2141 	    &regmatch, 0) == 0 ||
2142 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2143 	    &regmatch, 0) == 0 ||
2144 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2145 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2146 		*have_match = 1;
2147 done:
2148 	free(id_str);
2149 	free(logmsg);
2150 	return err;
2151 }
2152 
2153 static const struct got_error *
2154 queue_commits(struct tog_log_thread_args *a)
2155 {
2156 	const struct got_error *err = NULL;
2157 
2158 	/*
2159 	 * We keep all commits open throughout the lifetime of the log
2160 	 * view in order to avoid having to re-fetch commits from disk
2161 	 * while updating the display.
2162 	 */
2163 	do {
2164 		struct got_object_id *id;
2165 		struct got_commit_object *commit;
2166 		struct commit_queue_entry *entry;
2167 		int errcode;
2168 
2169 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2170 		    NULL, NULL);
2171 		if (err || id == NULL)
2172 			break;
2173 
2174 		err = got_object_open_as_commit(&commit, a->repo, id);
2175 		if (err)
2176 			break;
2177 		entry = alloc_commit_queue_entry(commit, id);
2178 		if (entry == NULL) {
2179 			err = got_error_from_errno("alloc_commit_queue_entry");
2180 			break;
2181 		}
2182 
2183 		errcode = pthread_mutex_lock(&tog_mutex);
2184 		if (errcode) {
2185 			err = got_error_set_errno(errcode,
2186 			    "pthread_mutex_lock");
2187 			break;
2188 		}
2189 
2190 		entry->idx = a->commits->ncommits;
2191 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2192 		a->commits->ncommits++;
2193 
2194 		if (*a->searching == TOG_SEARCH_FORWARD &&
2195 		    !*a->search_next_done) {
2196 			int have_match;
2197 			err = match_commit(&have_match, id, commit, a->regex);
2198 			if (err)
2199 				break;
2200 			if (have_match)
2201 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2202 		}
2203 
2204 		errcode = pthread_mutex_unlock(&tog_mutex);
2205 		if (errcode && err == NULL)
2206 			err = got_error_set_errno(errcode,
2207 			    "pthread_mutex_unlock");
2208 		if (err)
2209 			break;
2210 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2211 
2212 	return err;
2213 }
2214 
2215 static void
2216 select_commit(struct tog_log_view_state *s)
2217 {
2218 	struct commit_queue_entry *entry;
2219 	int ncommits = 0;
2220 
2221 	entry = s->first_displayed_entry;
2222 	while (entry) {
2223 		if (ncommits == s->selected) {
2224 			s->selected_entry = entry;
2225 			break;
2226 		}
2227 		entry = TAILQ_NEXT(entry, entry);
2228 		ncommits++;
2229 	}
2230 }
2231 
2232 static const struct got_error *
2233 draw_commits(struct tog_view *view)
2234 {
2235 	const struct got_error *err = NULL;
2236 	struct tog_log_view_state *s = &view->state.log;
2237 	struct commit_queue_entry *entry = s->selected_entry;
2238 	const int limit = view->nlines;
2239 	int width;
2240 	int ncommits, author_cols = 4;
2241 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2242 	char *refs_str = NULL;
2243 	wchar_t *wline;
2244 	struct tog_color *tc;
2245 	static const size_t date_display_cols = 12;
2246 
2247 	if (s->selected_entry &&
2248 	    !(view->searching && view->search_next_done == 0)) {
2249 		struct got_reflist_head *refs;
2250 		err = got_object_id_str(&id_str, s->selected_entry->id);
2251 		if (err)
2252 			return err;
2253 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2254 		    s->selected_entry->id);
2255 		if (refs) {
2256 			err = build_refs_str(&refs_str, refs,
2257 			    s->selected_entry->id, s->repo);
2258 			if (err)
2259 				goto done;
2260 		}
2261 	}
2262 
2263 	if (s->thread_args.commits_needed == 0)
2264 		halfdelay(10); /* disable fast refresh */
2265 
2266 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2267 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2268 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2269 		    (view->searching && !view->search_next_done) ?
2270 		    "searching..." : "loading...") == -1) {
2271 			err = got_error_from_errno("asprintf");
2272 			goto done;
2273 		}
2274 	} else {
2275 		const char *search_str = NULL;
2276 
2277 		if (view->searching) {
2278 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2279 				search_str = "no more matches";
2280 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2281 				search_str = "no matches found";
2282 			else if (!view->search_next_done)
2283 				search_str = "searching...";
2284 		}
2285 
2286 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2287 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2288 		    search_str ? search_str :
2289 		    (refs_str ? refs_str : "")) == -1) {
2290 			err = got_error_from_errno("asprintf");
2291 			goto done;
2292 		}
2293 	}
2294 
2295 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2296 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2297 		    "........................................",
2298 		    s->in_repo_path, ncommits_str) == -1) {
2299 			err = got_error_from_errno("asprintf");
2300 			header = NULL;
2301 			goto done;
2302 		}
2303 	} else if (asprintf(&header, "commit %s%s",
2304 	    id_str ? id_str : "........................................",
2305 	    ncommits_str) == -1) {
2306 		err = got_error_from_errno("asprintf");
2307 		header = NULL;
2308 		goto done;
2309 	}
2310 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2311 	if (err)
2312 		goto done;
2313 
2314 	werase(view->window);
2315 
2316 	if (view_needs_focus_indication(view))
2317 		wstandout(view->window);
2318 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2319 	if (tc)
2320 		wattr_on(view->window,
2321 		    COLOR_PAIR(tc->colorpair), NULL);
2322 	waddwstr(view->window, wline);
2323 	if (tc)
2324 		wattr_off(view->window,
2325 		    COLOR_PAIR(tc->colorpair), NULL);
2326 	while (width < view->ncols) {
2327 		waddch(view->window, ' ');
2328 		width++;
2329 	}
2330 	if (view_needs_focus_indication(view))
2331 		wstandend(view->window);
2332 	free(wline);
2333 	if (limit <= 1)
2334 		goto done;
2335 
2336 	/* Grow author column size if necessary, and set view->maxx. */
2337 	entry = s->first_displayed_entry;
2338 	ncommits = 0;
2339 	view->maxx = 0;
2340 	while (entry) {
2341 		struct got_commit_object *c = entry->commit;
2342 		char *author, *eol, *msg, *msg0;
2343 		wchar_t *wauthor, *wmsg;
2344 		int width;
2345 		if (ncommits >= limit - 1)
2346 			break;
2347 		if (s->use_committer)
2348 			author = strdup(got_object_commit_get_committer(c));
2349 		else
2350 			author = strdup(got_object_commit_get_author(c));
2351 		if (author == NULL) {
2352 			err = got_error_from_errno("strdup");
2353 			goto done;
2354 		}
2355 		err = format_author(&wauthor, &width, author, COLS,
2356 		    date_display_cols);
2357 		if (author_cols < width)
2358 			author_cols = width;
2359 		free(wauthor);
2360 		free(author);
2361 		if (err)
2362 			goto done;
2363 		err = got_object_commit_get_logmsg(&msg0, c);
2364 		if (err)
2365 			goto done;
2366 		msg = msg0;
2367 		while (*msg == '\n')
2368 			++msg;
2369 		if ((eol = strchr(msg, '\n')))
2370 			*eol = '\0';
2371 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2372 		    date_display_cols + author_cols, 0);
2373 		if (err)
2374 			goto done;
2375 		view->maxx = MAX(view->maxx, width);
2376 		free(msg0);
2377 		free(wmsg);
2378 		ncommits++;
2379 		entry = TAILQ_NEXT(entry, entry);
2380 	}
2381 
2382 	entry = s->first_displayed_entry;
2383 	s->last_displayed_entry = s->first_displayed_entry;
2384 	ncommits = 0;
2385 	while (entry) {
2386 		if (ncommits >= limit - 1)
2387 			break;
2388 		if (ncommits == s->selected)
2389 			wstandout(view->window);
2390 		err = draw_commit(view, entry->commit, entry->id,
2391 		    date_display_cols, author_cols);
2392 		if (ncommits == s->selected)
2393 			wstandend(view->window);
2394 		if (err)
2395 			goto done;
2396 		ncommits++;
2397 		s->last_displayed_entry = entry;
2398 		entry = TAILQ_NEXT(entry, entry);
2399 	}
2400 
2401 	view_border(view);
2402 done:
2403 	free(id_str);
2404 	free(refs_str);
2405 	free(ncommits_str);
2406 	free(header);
2407 	return err;
2408 }
2409 
2410 static void
2411 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2412 {
2413 	struct commit_queue_entry *entry;
2414 	int nscrolled = 0;
2415 
2416 	entry = TAILQ_FIRST(&s->commits.head);
2417 	if (s->first_displayed_entry == entry)
2418 		return;
2419 
2420 	entry = s->first_displayed_entry;
2421 	while (entry && nscrolled < maxscroll) {
2422 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2423 		if (entry) {
2424 			s->first_displayed_entry = entry;
2425 			nscrolled++;
2426 		}
2427 	}
2428 }
2429 
2430 static const struct got_error *
2431 trigger_log_thread(struct tog_view *view, int wait)
2432 {
2433 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2434 	int errcode;
2435 
2436 	halfdelay(1); /* fast refresh while loading commits */
2437 
2438 	while (!ta->log_complete && !tog_thread_error &&
2439 	    (ta->commits_needed > 0 || ta->load_all)) {
2440 		/* Wake the log thread. */
2441 		errcode = pthread_cond_signal(&ta->need_commits);
2442 		if (errcode)
2443 			return got_error_set_errno(errcode,
2444 			    "pthread_cond_signal");
2445 
2446 		/*
2447 		 * The mutex will be released while the view loop waits
2448 		 * in wgetch(), at which time the log thread will run.
2449 		 */
2450 		if (!wait)
2451 			break;
2452 
2453 		/* Display progress update in log view. */
2454 		show_log_view(view);
2455 		update_panels();
2456 		doupdate();
2457 
2458 		/* Wait right here while next commit is being loaded. */
2459 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2460 		if (errcode)
2461 			return got_error_set_errno(errcode,
2462 			    "pthread_cond_wait");
2463 
2464 		/* Display progress update in log view. */
2465 		show_log_view(view);
2466 		update_panels();
2467 		doupdate();
2468 	}
2469 
2470 	return NULL;
2471 }
2472 
2473 static const struct got_error *
2474 request_log_commits(struct tog_view *view)
2475 {
2476 	struct tog_log_view_state	*state = &view->state.log;
2477 	const struct got_error		*err = NULL;
2478 
2479 	if (state->thread_args.log_complete)
2480 		return NULL;
2481 
2482 	state->thread_args.commits_needed += view->nscrolled;
2483 	err = trigger_log_thread(view, 1);
2484 	view->nscrolled = 0;
2485 
2486 	return err;
2487 }
2488 
2489 static const struct got_error *
2490 log_scroll_down(struct tog_view *view, int maxscroll)
2491 {
2492 	struct tog_log_view_state *s = &view->state.log;
2493 	const struct got_error *err = NULL;
2494 	struct commit_queue_entry *pentry;
2495 	int nscrolled = 0, ncommits_needed;
2496 
2497 	if (s->last_displayed_entry == NULL)
2498 		return NULL;
2499 
2500 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2501 	if (s->commits.ncommits < ncommits_needed &&
2502 	    !s->thread_args.log_complete) {
2503 		/*
2504 		 * Ask the log thread for required amount of commits.
2505 		 */
2506 		s->thread_args.commits_needed += maxscroll;
2507 		err = trigger_log_thread(view, 1);
2508 		if (err)
2509 			return err;
2510 	}
2511 
2512 	do {
2513 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2514 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2515 			break;
2516 
2517 		s->last_displayed_entry = pentry ?
2518 		    pentry : s->last_displayed_entry;;
2519 
2520 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2521 		if (pentry == NULL)
2522 			break;
2523 		s->first_displayed_entry = pentry;
2524 	} while (++nscrolled < maxscroll);
2525 
2526 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2527 		view->nscrolled += nscrolled;
2528 	else
2529 		view->nscrolled = 0;
2530 
2531 	return err;
2532 }
2533 
2534 static const struct got_error *
2535 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2536     struct got_commit_object *commit, struct got_object_id *commit_id,
2537     struct tog_view *log_view, struct got_repository *repo)
2538 {
2539 	const struct got_error *err;
2540 	struct got_object_qid *parent_id;
2541 	struct tog_view *diff_view;
2542 
2543 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2544 	if (diff_view == NULL)
2545 		return got_error_from_errno("view_open");
2546 
2547 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2548 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2549 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2550 	if (err == NULL)
2551 		*new_view = diff_view;
2552 	return err;
2553 }
2554 
2555 static const struct got_error *
2556 tree_view_visit_subtree(struct tog_tree_view_state *s,
2557     struct got_tree_object *subtree)
2558 {
2559 	struct tog_parent_tree *parent;
2560 
2561 	parent = calloc(1, sizeof(*parent));
2562 	if (parent == NULL)
2563 		return got_error_from_errno("calloc");
2564 
2565 	parent->tree = s->tree;
2566 	parent->first_displayed_entry = s->first_displayed_entry;
2567 	parent->selected_entry = s->selected_entry;
2568 	parent->selected = s->selected;
2569 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2570 	s->tree = subtree;
2571 	s->selected = 0;
2572 	s->first_displayed_entry = NULL;
2573 	return NULL;
2574 }
2575 
2576 static const struct got_error *
2577 tree_view_walk_path(struct tog_tree_view_state *s,
2578     struct got_commit_object *commit, const char *path)
2579 {
2580 	const struct got_error *err = NULL;
2581 	struct got_tree_object *tree = NULL;
2582 	const char *p;
2583 	char *slash, *subpath = NULL;
2584 
2585 	/* Walk the path and open corresponding tree objects. */
2586 	p = path;
2587 	while (*p) {
2588 		struct got_tree_entry *te;
2589 		struct got_object_id *tree_id;
2590 		char *te_name;
2591 
2592 		while (p[0] == '/')
2593 			p++;
2594 
2595 		/* Ensure the correct subtree entry is selected. */
2596 		slash = strchr(p, '/');
2597 		if (slash == NULL)
2598 			te_name = strdup(p);
2599 		else
2600 			te_name = strndup(p, slash - p);
2601 		if (te_name == NULL) {
2602 			err = got_error_from_errno("strndup");
2603 			break;
2604 		}
2605 		te = got_object_tree_find_entry(s->tree, te_name);
2606 		if (te == NULL) {
2607 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2608 			free(te_name);
2609 			break;
2610 		}
2611 		free(te_name);
2612 		s->first_displayed_entry = s->selected_entry = te;
2613 
2614 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2615 			break; /* jump to this file's entry */
2616 
2617 		slash = strchr(p, '/');
2618 		if (slash)
2619 			subpath = strndup(path, slash - path);
2620 		else
2621 			subpath = strdup(path);
2622 		if (subpath == NULL) {
2623 			err = got_error_from_errno("strdup");
2624 			break;
2625 		}
2626 
2627 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2628 		    subpath);
2629 		if (err)
2630 			break;
2631 
2632 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2633 		free(tree_id);
2634 		if (err)
2635 			break;
2636 
2637 		err = tree_view_visit_subtree(s, tree);
2638 		if (err) {
2639 			got_object_tree_close(tree);
2640 			break;
2641 		}
2642 		if (slash == NULL)
2643 			break;
2644 		free(subpath);
2645 		subpath = NULL;
2646 		p = slash;
2647 	}
2648 
2649 	free(subpath);
2650 	return err;
2651 }
2652 
2653 static const struct got_error *
2654 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2655     struct commit_queue_entry *entry, const char *path,
2656     const char *head_ref_name, struct got_repository *repo)
2657 {
2658 	const struct got_error *err = NULL;
2659 	struct tog_tree_view_state *s;
2660 	struct tog_view *tree_view;
2661 
2662 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2663 	if (tree_view == NULL)
2664 		return got_error_from_errno("view_open");
2665 
2666 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2667 	if (err)
2668 		return err;
2669 	s = &tree_view->state.tree;
2670 
2671 	*new_view = tree_view;
2672 
2673 	if (got_path_is_root_dir(path))
2674 		return NULL;
2675 
2676 	return tree_view_walk_path(s, entry->commit, path);
2677 }
2678 
2679 static const struct got_error *
2680 block_signals_used_by_main_thread(void)
2681 {
2682 	sigset_t sigset;
2683 	int errcode;
2684 
2685 	if (sigemptyset(&sigset) == -1)
2686 		return got_error_from_errno("sigemptyset");
2687 
2688 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2689 	if (sigaddset(&sigset, SIGWINCH) == -1)
2690 		return got_error_from_errno("sigaddset");
2691 	if (sigaddset(&sigset, SIGCONT) == -1)
2692 		return got_error_from_errno("sigaddset");
2693 	if (sigaddset(&sigset, SIGINT) == -1)
2694 		return got_error_from_errno("sigaddset");
2695 	if (sigaddset(&sigset, SIGTERM) == -1)
2696 		return got_error_from_errno("sigaddset");
2697 
2698 	/* ncurses handles SIGTSTP */
2699 	if (sigaddset(&sigset, SIGTSTP) == -1)
2700 		return got_error_from_errno("sigaddset");
2701 
2702 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2703 	if (errcode)
2704 		return got_error_set_errno(errcode, "pthread_sigmask");
2705 
2706 	return NULL;
2707 }
2708 
2709 static void *
2710 log_thread(void *arg)
2711 {
2712 	const struct got_error *err = NULL;
2713 	int errcode = 0;
2714 	struct tog_log_thread_args *a = arg;
2715 	int done = 0;
2716 
2717 	/*
2718 	 * Sync startup with main thread such that we begin our
2719 	 * work once view_input() has released the mutex.
2720 	 */
2721 	errcode = pthread_mutex_lock(&tog_mutex);
2722 	if (errcode) {
2723 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2724 		return (void *)err;
2725 	}
2726 
2727 	err = block_signals_used_by_main_thread();
2728 	if (err) {
2729 		pthread_mutex_unlock(&tog_mutex);
2730 		goto done;
2731 	}
2732 
2733 	while (!done && !err && !tog_fatal_signal_received()) {
2734 		errcode = pthread_mutex_unlock(&tog_mutex);
2735 		if (errcode) {
2736 			err = got_error_set_errno(errcode,
2737 			    "pthread_mutex_unlock");
2738 			goto done;
2739 		}
2740 		err = queue_commits(a);
2741 		if (err) {
2742 			if (err->code != GOT_ERR_ITER_COMPLETED)
2743 				goto done;
2744 			err = NULL;
2745 			done = 1;
2746 		} else if (a->commits_needed > 0 && !a->load_all)
2747 			a->commits_needed--;
2748 
2749 		errcode = pthread_mutex_lock(&tog_mutex);
2750 		if (errcode) {
2751 			err = got_error_set_errno(errcode,
2752 			    "pthread_mutex_lock");
2753 			goto done;
2754 		} else if (*a->quit)
2755 			done = 1;
2756 		else if (*a->first_displayed_entry == NULL) {
2757 			*a->first_displayed_entry =
2758 			    TAILQ_FIRST(&a->commits->head);
2759 			*a->selected_entry = *a->first_displayed_entry;
2760 		}
2761 
2762 		errcode = pthread_cond_signal(&a->commit_loaded);
2763 		if (errcode) {
2764 			err = got_error_set_errno(errcode,
2765 			    "pthread_cond_signal");
2766 			pthread_mutex_unlock(&tog_mutex);
2767 			goto done;
2768 		}
2769 
2770 		if (done)
2771 			a->commits_needed = 0;
2772 		else {
2773 			if (a->commits_needed == 0 && !a->load_all) {
2774 				errcode = pthread_cond_wait(&a->need_commits,
2775 				    &tog_mutex);
2776 				if (errcode) {
2777 					err = got_error_set_errno(errcode,
2778 					    "pthread_cond_wait");
2779 					pthread_mutex_unlock(&tog_mutex);
2780 					goto done;
2781 				}
2782 				if (*a->quit)
2783 					done = 1;
2784 			}
2785 		}
2786 	}
2787 	a->log_complete = 1;
2788 	errcode = pthread_mutex_unlock(&tog_mutex);
2789 	if (errcode)
2790 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2791 done:
2792 	if (err) {
2793 		tog_thread_error = 1;
2794 		pthread_cond_signal(&a->commit_loaded);
2795 	}
2796 	return (void *)err;
2797 }
2798 
2799 static const struct got_error *
2800 stop_log_thread(struct tog_log_view_state *s)
2801 {
2802 	const struct got_error *err = NULL, *thread_err = NULL;
2803 	int errcode;
2804 
2805 	if (s->thread) {
2806 		s->quit = 1;
2807 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2808 		if (errcode)
2809 			return got_error_set_errno(errcode,
2810 			    "pthread_cond_signal");
2811 		errcode = pthread_mutex_unlock(&tog_mutex);
2812 		if (errcode)
2813 			return got_error_set_errno(errcode,
2814 			    "pthread_mutex_unlock");
2815 		errcode = pthread_join(s->thread, (void **)&thread_err);
2816 		if (errcode)
2817 			return got_error_set_errno(errcode, "pthread_join");
2818 		errcode = pthread_mutex_lock(&tog_mutex);
2819 		if (errcode)
2820 			return got_error_set_errno(errcode,
2821 			    "pthread_mutex_lock");
2822 		s->thread = 0; //NULL;
2823 	}
2824 
2825 	if (s->thread_args.repo) {
2826 		err = got_repo_close(s->thread_args.repo);
2827 		s->thread_args.repo = NULL;
2828 	}
2829 
2830 	if (s->thread_args.pack_fds) {
2831 		const struct got_error *pack_err =
2832 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2833 		if (err == NULL)
2834 			err = pack_err;
2835 		s->thread_args.pack_fds = NULL;
2836 	}
2837 
2838 	if (s->thread_args.graph) {
2839 		got_commit_graph_close(s->thread_args.graph);
2840 		s->thread_args.graph = NULL;
2841 	}
2842 
2843 	return err ? err : thread_err;
2844 }
2845 
2846 static const struct got_error *
2847 close_log_view(struct tog_view *view)
2848 {
2849 	const struct got_error *err = NULL;
2850 	struct tog_log_view_state *s = &view->state.log;
2851 	int errcode;
2852 
2853 	err = stop_log_thread(s);
2854 
2855 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2856 	if (errcode && err == NULL)
2857 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2858 
2859 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2860 	if (errcode && err == NULL)
2861 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2862 
2863 	free_commits(&s->commits);
2864 	free(s->in_repo_path);
2865 	s->in_repo_path = NULL;
2866 	free(s->start_id);
2867 	s->start_id = NULL;
2868 	free(s->head_ref_name);
2869 	s->head_ref_name = NULL;
2870 	return err;
2871 }
2872 
2873 static const struct got_error *
2874 search_start_log_view(struct tog_view *view)
2875 {
2876 	struct tog_log_view_state *s = &view->state.log;
2877 
2878 	s->matched_entry = NULL;
2879 	s->search_entry = NULL;
2880 	return NULL;
2881 }
2882 
2883 static const struct got_error *
2884 search_next_log_view(struct tog_view *view)
2885 {
2886 	const struct got_error *err = NULL;
2887 	struct tog_log_view_state *s = &view->state.log;
2888 	struct commit_queue_entry *entry;
2889 
2890 	/* Display progress update in log view. */
2891 	show_log_view(view);
2892 	update_panels();
2893 	doupdate();
2894 
2895 	if (s->search_entry) {
2896 		int errcode, ch;
2897 		errcode = pthread_mutex_unlock(&tog_mutex);
2898 		if (errcode)
2899 			return got_error_set_errno(errcode,
2900 			    "pthread_mutex_unlock");
2901 		ch = wgetch(view->window);
2902 		errcode = pthread_mutex_lock(&tog_mutex);
2903 		if (errcode)
2904 			return got_error_set_errno(errcode,
2905 			    "pthread_mutex_lock");
2906 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2907 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2908 			return NULL;
2909 		}
2910 		if (view->searching == TOG_SEARCH_FORWARD)
2911 			entry = TAILQ_NEXT(s->search_entry, entry);
2912 		else
2913 			entry = TAILQ_PREV(s->search_entry,
2914 			    commit_queue_head, entry);
2915 	} else if (s->matched_entry) {
2916 		int matched_idx = s->matched_entry->idx;
2917 		int selected_idx = s->selected_entry->idx;
2918 
2919 		/*
2920 		 * If the user has moved the cursor after we hit a match,
2921 		 * the position from where we should continue searching
2922 		 * might have changed.
2923 		 */
2924 		if (view->searching == TOG_SEARCH_FORWARD) {
2925 			if (matched_idx > selected_idx)
2926 				entry = TAILQ_NEXT(s->selected_entry, entry);
2927 			else
2928 				entry = TAILQ_NEXT(s->matched_entry, entry);
2929 		} else {
2930 			if (matched_idx < selected_idx)
2931 				entry = TAILQ_PREV(s->selected_entry,
2932 						commit_queue_head, entry);
2933 			else
2934 				entry = TAILQ_PREV(s->matched_entry,
2935 						commit_queue_head, entry);
2936 		}
2937 	} else {
2938 		entry = s->selected_entry;
2939 	}
2940 
2941 	while (1) {
2942 		int have_match = 0;
2943 
2944 		if (entry == NULL) {
2945 			if (s->thread_args.log_complete ||
2946 			    view->searching == TOG_SEARCH_BACKWARD) {
2947 				view->search_next_done =
2948 				    (s->matched_entry == NULL ?
2949 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2950 				s->search_entry = NULL;
2951 				return NULL;
2952 			}
2953 			/*
2954 			 * Poke the log thread for more commits and return,
2955 			 * allowing the main loop to make progress. Search
2956 			 * will resume at s->search_entry once we come back.
2957 			 */
2958 			s->thread_args.commits_needed++;
2959 			return trigger_log_thread(view, 0);
2960 		}
2961 
2962 		err = match_commit(&have_match, entry->id, entry->commit,
2963 		    &view->regex);
2964 		if (err)
2965 			break;
2966 		if (have_match) {
2967 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2968 			s->matched_entry = entry;
2969 			break;
2970 		}
2971 
2972 		s->search_entry = entry;
2973 		if (view->searching == TOG_SEARCH_FORWARD)
2974 			entry = TAILQ_NEXT(entry, entry);
2975 		else
2976 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2977 	}
2978 
2979 	if (s->matched_entry) {
2980 		int cur = s->selected_entry->idx;
2981 		while (cur < s->matched_entry->idx) {
2982 			err = input_log_view(NULL, view, KEY_DOWN);
2983 			if (err)
2984 				return err;
2985 			cur++;
2986 		}
2987 		while (cur > s->matched_entry->idx) {
2988 			err = input_log_view(NULL, view, KEY_UP);
2989 			if (err)
2990 				return err;
2991 			cur--;
2992 		}
2993 	}
2994 
2995 	s->search_entry = NULL;
2996 
2997 	return NULL;
2998 }
2999 
3000 static const struct got_error *
3001 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3002     struct got_repository *repo, const char *head_ref_name,
3003     const char *in_repo_path, int log_branches)
3004 {
3005 	const struct got_error *err = NULL;
3006 	struct tog_log_view_state *s = &view->state.log;
3007 	struct got_repository *thread_repo = NULL;
3008 	struct got_commit_graph *thread_graph = NULL;
3009 	int errcode;
3010 
3011 	if (in_repo_path != s->in_repo_path) {
3012 		free(s->in_repo_path);
3013 		s->in_repo_path = strdup(in_repo_path);
3014 		if (s->in_repo_path == NULL)
3015 			return got_error_from_errno("strdup");
3016 	}
3017 
3018 	/* The commit queue only contains commits being displayed. */
3019 	TAILQ_INIT(&s->commits.head);
3020 	s->commits.ncommits = 0;
3021 
3022 	s->repo = repo;
3023 	if (head_ref_name) {
3024 		s->head_ref_name = strdup(head_ref_name);
3025 		if (s->head_ref_name == NULL) {
3026 			err = got_error_from_errno("strdup");
3027 			goto done;
3028 		}
3029 	}
3030 	s->start_id = got_object_id_dup(start_id);
3031 	if (s->start_id == NULL) {
3032 		err = got_error_from_errno("got_object_id_dup");
3033 		goto done;
3034 	}
3035 	s->log_branches = log_branches;
3036 
3037 	STAILQ_INIT(&s->colors);
3038 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3039 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3040 		    get_color_value("TOG_COLOR_COMMIT"));
3041 		if (err)
3042 			goto done;
3043 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3044 		    get_color_value("TOG_COLOR_AUTHOR"));
3045 		if (err) {
3046 			free_colors(&s->colors);
3047 			goto done;
3048 		}
3049 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3050 		    get_color_value("TOG_COLOR_DATE"));
3051 		if (err) {
3052 			free_colors(&s->colors);
3053 			goto done;
3054 		}
3055 	}
3056 
3057 	view->show = show_log_view;
3058 	view->input = input_log_view;
3059 	view->resize = resize_log_view;
3060 	view->close = close_log_view;
3061 	view->search_start = search_start_log_view;
3062 	view->search_next = search_next_log_view;
3063 
3064 	if (s->thread_args.pack_fds == NULL) {
3065 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3066 		if (err)
3067 			goto done;
3068 	}
3069 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3070 	    s->thread_args.pack_fds);
3071 	if (err)
3072 		goto done;
3073 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3074 	    !s->log_branches);
3075 	if (err)
3076 		goto done;
3077 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3078 	    s->repo, NULL, NULL);
3079 	if (err)
3080 		goto done;
3081 
3082 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3083 	if (errcode) {
3084 		err = got_error_set_errno(errcode, "pthread_cond_init");
3085 		goto done;
3086 	}
3087 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3088 	if (errcode) {
3089 		err = got_error_set_errno(errcode, "pthread_cond_init");
3090 		goto done;
3091 	}
3092 
3093 	s->thread_args.commits_needed = view->nlines;
3094 	s->thread_args.graph = thread_graph;
3095 	s->thread_args.commits = &s->commits;
3096 	s->thread_args.in_repo_path = s->in_repo_path;
3097 	s->thread_args.start_id = s->start_id;
3098 	s->thread_args.repo = thread_repo;
3099 	s->thread_args.log_complete = 0;
3100 	s->thread_args.quit = &s->quit;
3101 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3102 	s->thread_args.selected_entry = &s->selected_entry;
3103 	s->thread_args.searching = &view->searching;
3104 	s->thread_args.search_next_done = &view->search_next_done;
3105 	s->thread_args.regex = &view->regex;
3106 done:
3107 	if (err)
3108 		close_log_view(view);
3109 	return err;
3110 }
3111 
3112 static const struct got_error *
3113 show_log_view(struct tog_view *view)
3114 {
3115 	const struct got_error *err;
3116 	struct tog_log_view_state *s = &view->state.log;
3117 
3118 	if (s->thread == 0) { //NULL) {
3119 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3120 		    &s->thread_args);
3121 		if (errcode)
3122 			return got_error_set_errno(errcode, "pthread_create");
3123 		if (s->thread_args.commits_needed > 0) {
3124 			err = trigger_log_thread(view, 1);
3125 			if (err)
3126 				return err;
3127 		}
3128 	}
3129 
3130 	return draw_commits(view);
3131 }
3132 
3133 static void
3134 log_move_cursor_up(struct tog_view *view, int page, int home)
3135 {
3136 	struct tog_log_view_state *s = &view->state.log;
3137 
3138 	if (s->selected_entry->idx == 0)
3139 		view->count = 0;
3140 	if (s->first_displayed_entry == NULL)
3141 		return;
3142 
3143 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3144 	    || home)
3145 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3146 
3147 	if (!page && !home && s->selected > 0)
3148 		--s->selected;
3149 	else
3150 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3151 
3152 	select_commit(s);
3153 	return;
3154 }
3155 
3156 static const struct got_error *
3157 log_move_cursor_down(struct tog_view *view, int page)
3158 {
3159 	struct tog_log_view_state	*s = &view->state.log;
3160 	struct commit_queue_entry	*first;
3161 	const struct got_error		*err = NULL;
3162 
3163 	first = s->first_displayed_entry;
3164 	if (first == NULL) {
3165 		view->count = 0;
3166 		return NULL;
3167 	}
3168 
3169 	if (s->thread_args.log_complete &&
3170 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3171 		return NULL;
3172 
3173 	if (!page) {
3174 		int eos = view->nlines - 2;
3175 
3176 		if (view_is_hsplit_top(view))
3177 			--eos;  /* border consumes the last line */
3178 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3179 			++s->selected;
3180 		else
3181 			err = log_scroll_down(view, 1);
3182 	} else if (s->thread_args.load_all) {
3183 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3184 			s->selected += MIN(s->last_displayed_entry->idx -
3185 			    s->selected_entry->idx, page + 1);
3186 		else
3187 			err = log_scroll_down(view, MIN(page,
3188 			    s->commits.ncommits - s->selected_entry->idx - 1));
3189 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3190 	} else {
3191 		err = log_scroll_down(view, page);
3192 		if (err)
3193 			return err;
3194 		if (first == s->first_displayed_entry && s->selected <
3195 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3196 			s->selected = MIN(s->commits.ncommits - 1, page);
3197 		}
3198 	}
3199 	if (err)
3200 		return err;
3201 
3202 	/*
3203 	 * We might necessarily overshoot in horizontal
3204 	 * splits; if so, select the last displayed commit.
3205 	 */
3206 	s->selected = MIN(s->selected,
3207 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3208 
3209 	select_commit(s);
3210 
3211 	if (s->thread_args.log_complete &&
3212 	    s->selected_entry->idx == s->commits.ncommits - 1)
3213 		view->count = 0;
3214 
3215 	return NULL;
3216 }
3217 
3218 static void
3219 view_get_split(struct tog_view *view, int *y, int *x)
3220 {
3221 	*x = 0;
3222 	*y = 0;
3223 
3224 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3225 		if (view->child && view->child->resized_y)
3226 			*y = view->child->resized_y;
3227 		else if (view->resized_y)
3228 			*y = view->resized_y;
3229 		else
3230 			*y = view_split_begin_y(view->lines);
3231 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3232 		if (view->child && view->child->resized_x)
3233 			*x = view->child->resized_x;
3234 		else if (view->resized_x)
3235 			*x = view->resized_x;
3236 		else
3237 			*x = view_split_begin_x(view->begin_x);
3238 	}
3239 }
3240 
3241 /* Split view horizontally at y and offset view->state->selected line. */
3242 static const struct got_error *
3243 view_init_hsplit(struct tog_view *view, int y)
3244 {
3245 	const struct got_error *err = NULL;
3246 
3247 	view->nlines = y;
3248 	view->ncols = COLS;
3249 	err = view_resize(view);
3250 	if (err)
3251 		return err;
3252 
3253 	err = offset_selection_down(view);
3254 
3255 	return err;
3256 }
3257 
3258 static const struct got_error *
3259 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3260 {
3261 	const struct got_error *err = NULL;
3262 	struct tog_log_view_state *s = &view->state.log;
3263 	struct commit_queue_entry *entry;
3264 	int eos, n, nscroll;
3265 
3266 	if (s->thread_args.load_all) {
3267 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3268 			s->thread_args.load_all = 0;
3269 		else if (s->thread_args.log_complete) {
3270 			err = log_move_cursor_down(view, s->commits.ncommits);
3271 			s->thread_args.load_all = 0;
3272 		}
3273 		return err;
3274 	}
3275 
3276 	eos = nscroll = view->nlines - 1;
3277 	if (view_is_hsplit_top(view))
3278 		--eos;  /* border */
3279 
3280 	switch (ch) {
3281 	case 'q':
3282 		s->quit = 1;
3283 		break;
3284 	case '0':
3285 		view->x = 0;
3286 		break;
3287 	case '$':
3288 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3289 		view->count = 0;
3290 		break;
3291 	case KEY_RIGHT:
3292 	case 'l':
3293 		if (view->x + view->ncols / 2 < view->maxx)
3294 			view->x += 2;  /* move two columns right */
3295 		else
3296 			view->count = 0;
3297 		break;
3298 	case KEY_LEFT:
3299 	case 'h':
3300 		view->x -= MIN(view->x, 2);  /* move two columns back */
3301 		if (view->x <= 0)
3302 			view->count = 0;
3303 		break;
3304 	case 'k':
3305 	case KEY_UP:
3306 	case '<':
3307 	case ',':
3308 	case CTRL('p'):
3309 		log_move_cursor_up(view, 0, 0);
3310 		break;
3311 	case 'g':
3312 	case KEY_HOME:
3313 		log_move_cursor_up(view, 0, 1);
3314 		view->count = 0;
3315 		break;
3316 	case CTRL('u'):
3317 	case 'u':
3318 		nscroll /= 2;
3319 		/* FALL THROUGH */
3320 	case KEY_PPAGE:
3321 	case CTRL('b'):
3322 	case 'b':
3323 		log_move_cursor_up(view, nscroll, 0);
3324 		break;
3325 	case 'j':
3326 	case KEY_DOWN:
3327 	case '>':
3328 	case '.':
3329 	case CTRL('n'):
3330 		err = log_move_cursor_down(view, 0);
3331 		break;
3332 	case '@':
3333 		s->use_committer = !s->use_committer;
3334 		break;
3335 	case 'G':
3336 	case KEY_END: {
3337 		/* We don't know yet how many commits, so we're forced to
3338 		 * traverse them all. */
3339 		view->count = 0;
3340 		if (!s->thread_args.log_complete) {
3341 			s->thread_args.load_all = 1;
3342 			return trigger_log_thread(view, 0);
3343 		}
3344 
3345 		s->selected = 0;
3346 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3347 		for (n = 0; n < eos; n++) {
3348 			if (entry == NULL)
3349 				break;
3350 			s->first_displayed_entry = entry;
3351 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3352 		}
3353 		if (n > 0)
3354 			s->selected = n - 1;
3355 		select_commit(s);
3356 		break;
3357 	}
3358 	case CTRL('d'):
3359 	case 'd':
3360 		nscroll /= 2;
3361 		/* FALL THROUGH */
3362 	case KEY_NPAGE:
3363 	case CTRL('f'):
3364 	case 'f':
3365 	case ' ':
3366 		err = log_move_cursor_down(view, nscroll);
3367 		break;
3368 	case KEY_RESIZE:
3369 		if (s->selected > view->nlines - 2)
3370 			s->selected = view->nlines - 2;
3371 		if (s->selected > s->commits.ncommits - 1)
3372 			s->selected = s->commits.ncommits - 1;
3373 		select_commit(s);
3374 		if (s->commits.ncommits < view->nlines - 1 &&
3375 		    !s->thread_args.log_complete) {
3376 			s->thread_args.commits_needed += (view->nlines - 1) -
3377 			    s->commits.ncommits;
3378 			err = trigger_log_thread(view, 1);
3379 		}
3380 		break;
3381 	case KEY_ENTER:
3382 	case '\r':
3383 		view->count = 0;
3384 		if (s->selected_entry == NULL)
3385 			break;
3386 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3387 		break;
3388 	case 'T':
3389 		view->count = 0;
3390 		if (s->selected_entry == NULL)
3391 			break;
3392 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3393 		break;
3394 	case KEY_BACKSPACE:
3395 	case CTRL('l'):
3396 	case 'B':
3397 		view->count = 0;
3398 		if (ch == KEY_BACKSPACE &&
3399 		    got_path_is_root_dir(s->in_repo_path))
3400 			break;
3401 		err = stop_log_thread(s);
3402 		if (err)
3403 			return err;
3404 		if (ch == KEY_BACKSPACE) {
3405 			char *parent_path;
3406 			err = got_path_dirname(&parent_path, s->in_repo_path);
3407 			if (err)
3408 				return err;
3409 			free(s->in_repo_path);
3410 			s->in_repo_path = parent_path;
3411 			s->thread_args.in_repo_path = s->in_repo_path;
3412 		} else if (ch == CTRL('l')) {
3413 			struct got_object_id *start_id;
3414 			err = got_repo_match_object_id(&start_id, NULL,
3415 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3416 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3417 			if (err)
3418 				return err;
3419 			free(s->start_id);
3420 			s->start_id = start_id;
3421 			s->thread_args.start_id = s->start_id;
3422 		} else /* 'B' */
3423 			s->log_branches = !s->log_branches;
3424 
3425 		if (s->thread_args.pack_fds == NULL) {
3426 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3427 			if (err)
3428 				return err;
3429 		}
3430 		err = got_repo_open(&s->thread_args.repo,
3431 		    got_repo_get_path(s->repo), NULL,
3432 		    s->thread_args.pack_fds);
3433 		if (err)
3434 			return err;
3435 		tog_free_refs();
3436 		err = tog_load_refs(s->repo, 0);
3437 		if (err)
3438 			return err;
3439 		err = got_commit_graph_open(&s->thread_args.graph,
3440 		    s->in_repo_path, !s->log_branches);
3441 		if (err)
3442 			return err;
3443 		err = got_commit_graph_iter_start(s->thread_args.graph,
3444 		    s->start_id, s->repo, NULL, NULL);
3445 		if (err)
3446 			return err;
3447 		free_commits(&s->commits);
3448 		s->first_displayed_entry = NULL;
3449 		s->last_displayed_entry = NULL;
3450 		s->selected_entry = NULL;
3451 		s->selected = 0;
3452 		s->thread_args.log_complete = 0;
3453 		s->quit = 0;
3454 		s->thread_args.commits_needed = view->lines;
3455 		s->matched_entry = NULL;
3456 		s->search_entry = NULL;
3457 		view->offset = 0;
3458 		break;
3459 	case 'R':
3460 		view->count = 0;
3461 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3462 		break;
3463 	default:
3464 		view->count = 0;
3465 		break;
3466 	}
3467 
3468 	return err;
3469 }
3470 
3471 static const struct got_error *
3472 apply_unveil(const char *repo_path, const char *worktree_path)
3473 {
3474 	const struct got_error *error;
3475 
3476 #ifdef PROFILE
3477 	if (unveil("gmon.out", "rwc") != 0)
3478 		return got_error_from_errno2("unveil", "gmon.out");
3479 #endif
3480 	if (repo_path && unveil(repo_path, "r") != 0)
3481 		return got_error_from_errno2("unveil", repo_path);
3482 
3483 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3484 		return got_error_from_errno2("unveil", worktree_path);
3485 
3486 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3487 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3488 
3489 	error = got_privsep_unveil_exec_helpers();
3490 	if (error != NULL)
3491 		return error;
3492 
3493 	if (unveil(NULL, NULL) != 0)
3494 		return got_error_from_errno("unveil");
3495 
3496 	return NULL;
3497 }
3498 
3499 static void
3500 init_curses(void)
3501 {
3502 	/*
3503 	 * Override default signal handlers before starting ncurses.
3504 	 * This should prevent ncurses from installing its own
3505 	 * broken cleanup() signal handler.
3506 	 */
3507 	signal(SIGWINCH, tog_sigwinch);
3508 	signal(SIGPIPE, tog_sigpipe);
3509 	signal(SIGCONT, tog_sigcont);
3510 	signal(SIGINT, tog_sigint);
3511 	signal(SIGTERM, tog_sigterm);
3512 
3513 	initscr();
3514 	cbreak();
3515 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3516 	noecho();
3517 	nonl();
3518 	intrflush(stdscr, FALSE);
3519 	keypad(stdscr, TRUE);
3520 	curs_set(0);
3521 	if (getenv("TOG_COLORS") != NULL) {
3522 		start_color();
3523 		use_default_colors();
3524 	}
3525 }
3526 
3527 static const struct got_error *
3528 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3529     struct got_repository *repo, struct got_worktree *worktree)
3530 {
3531 	const struct got_error *err = NULL;
3532 
3533 	if (argc == 0) {
3534 		*in_repo_path = strdup("/");
3535 		if (*in_repo_path == NULL)
3536 			return got_error_from_errno("strdup");
3537 		return NULL;
3538 	}
3539 
3540 	if (worktree) {
3541 		const char *prefix = got_worktree_get_path_prefix(worktree);
3542 		char *p;
3543 
3544 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3545 		if (err)
3546 			return err;
3547 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3548 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3549 		    p) == -1) {
3550 			err = got_error_from_errno("asprintf");
3551 			*in_repo_path = NULL;
3552 		}
3553 		free(p);
3554 	} else
3555 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3556 
3557 	return err;
3558 }
3559 
3560 static const struct got_error *
3561 cmd_log(int argc, char *argv[])
3562 {
3563 	const struct got_error *error;
3564 	struct got_repository *repo = NULL;
3565 	struct got_worktree *worktree = NULL;
3566 	struct got_object_id *start_id = NULL;
3567 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3568 	char *start_commit = NULL, *label = NULL;
3569 	struct got_reference *ref = NULL;
3570 	const char *head_ref_name = NULL;
3571 	int ch, log_branches = 0;
3572 	struct tog_view *view;
3573 	int *pack_fds = NULL;
3574 
3575 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3576 		switch (ch) {
3577 		case 'b':
3578 			log_branches = 1;
3579 			break;
3580 		case 'c':
3581 			start_commit = optarg;
3582 			break;
3583 		case 'r':
3584 			repo_path = realpath(optarg, NULL);
3585 			if (repo_path == NULL)
3586 				return got_error_from_errno2("realpath",
3587 				    optarg);
3588 			break;
3589 		default:
3590 			usage_log();
3591 			/* NOTREACHED */
3592 		}
3593 	}
3594 
3595 	argc -= optind;
3596 	argv += optind;
3597 
3598 	if (argc > 1)
3599 		usage_log();
3600 
3601 	error = got_repo_pack_fds_open(&pack_fds);
3602 	if (error != NULL)
3603 		goto done;
3604 
3605 	if (repo_path == NULL) {
3606 		cwd = getcwd(NULL, 0);
3607 		if (cwd == NULL)
3608 			return got_error_from_errno("getcwd");
3609 		error = got_worktree_open(&worktree, cwd);
3610 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3611 			goto done;
3612 		if (worktree)
3613 			repo_path =
3614 			    strdup(got_worktree_get_repo_path(worktree));
3615 		else
3616 			repo_path = strdup(cwd);
3617 		if (repo_path == NULL) {
3618 			error = got_error_from_errno("strdup");
3619 			goto done;
3620 		}
3621 	}
3622 
3623 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3624 	if (error != NULL)
3625 		goto done;
3626 
3627 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3628 	    repo, worktree);
3629 	if (error)
3630 		goto done;
3631 
3632 	init_curses();
3633 
3634 	error = apply_unveil(got_repo_get_path(repo),
3635 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3636 	if (error)
3637 		goto done;
3638 
3639 	/* already loaded by tog_log_with_path()? */
3640 	if (TAILQ_EMPTY(&tog_refs)) {
3641 		error = tog_load_refs(repo, 0);
3642 		if (error)
3643 			goto done;
3644 	}
3645 
3646 	if (start_commit == NULL) {
3647 		error = got_repo_match_object_id(&start_id, &label,
3648 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3649 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3650 		if (error)
3651 			goto done;
3652 		head_ref_name = label;
3653 	} else {
3654 		error = got_ref_open(&ref, repo, start_commit, 0);
3655 		if (error == NULL)
3656 			head_ref_name = got_ref_get_name(ref);
3657 		else if (error->code != GOT_ERR_NOT_REF)
3658 			goto done;
3659 		error = got_repo_match_object_id(&start_id, NULL,
3660 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3661 		if (error)
3662 			goto done;
3663 	}
3664 
3665 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3666 	if (view == NULL) {
3667 		error = got_error_from_errno("view_open");
3668 		goto done;
3669 	}
3670 	error = open_log_view(view, start_id, repo, head_ref_name,
3671 	    in_repo_path, log_branches);
3672 	if (error)
3673 		goto done;
3674 	if (worktree) {
3675 		/* Release work tree lock. */
3676 		got_worktree_close(worktree);
3677 		worktree = NULL;
3678 	}
3679 	error = view_loop(view);
3680 done:
3681 	free(in_repo_path);
3682 	free(repo_path);
3683 	free(cwd);
3684 	free(start_id);
3685 	free(label);
3686 	if (ref)
3687 		got_ref_close(ref);
3688 	if (repo) {
3689 		const struct got_error *close_err = got_repo_close(repo);
3690 		if (error == NULL)
3691 			error = close_err;
3692 	}
3693 	if (worktree)
3694 		got_worktree_close(worktree);
3695 	if (pack_fds) {
3696 		const struct got_error *pack_err =
3697 		    got_repo_pack_fds_close(pack_fds);
3698 		if (error == NULL)
3699 			error = pack_err;
3700 	}
3701 	tog_free_refs();
3702 	return error;
3703 }
3704 
3705 __dead static void
3706 usage_diff(void)
3707 {
3708 	endwin();
3709 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3710 	    "[-w] object1 object2\n", getprogname());
3711 	exit(1);
3712 }
3713 
3714 static int
3715 match_line(const char *line, regex_t *regex, size_t nmatch,
3716     regmatch_t *regmatch)
3717 {
3718 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3719 }
3720 
3721 static struct tog_color *
3722 match_color(struct tog_colors *colors, const char *line)
3723 {
3724 	struct tog_color *tc = NULL;
3725 
3726 	STAILQ_FOREACH(tc, colors, entry) {
3727 		if (match_line(line, &tc->regex, 0, NULL))
3728 			return tc;
3729 	}
3730 
3731 	return NULL;
3732 }
3733 
3734 static const struct got_error *
3735 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3736     WINDOW *window, int skipcol, regmatch_t *regmatch)
3737 {
3738 	const struct got_error *err = NULL;
3739 	char *exstr = NULL;
3740 	wchar_t *wline = NULL;
3741 	int rme, rms, n, width, scrollx;
3742 	int width0 = 0, width1 = 0, width2 = 0;
3743 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3744 
3745 	*wtotal = 0;
3746 
3747 	rms = regmatch->rm_so;
3748 	rme = regmatch->rm_eo;
3749 
3750 	err = expand_tab(&exstr, line);
3751 	if (err)
3752 		return err;
3753 
3754 	/* Split the line into 3 segments, according to match offsets. */
3755 	seg0 = strndup(exstr, rms);
3756 	if (seg0 == NULL) {
3757 		err = got_error_from_errno("strndup");
3758 		goto done;
3759 	}
3760 	seg1 = strndup(exstr + rms, rme - rms);
3761 	if (seg1 == NULL) {
3762 		err = got_error_from_errno("strndup");
3763 		goto done;
3764 	}
3765 	seg2 = strdup(exstr + rme);
3766 	if (seg2 == NULL) {
3767 		err = got_error_from_errno("strndup");
3768 		goto done;
3769 	}
3770 
3771 	/* draw up to matched token if we haven't scrolled past it */
3772 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3773 	    col_tab_align, 1);
3774 	if (err)
3775 		goto done;
3776 	n = MAX(width0 - skipcol, 0);
3777 	if (n) {
3778 		free(wline);
3779 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3780 		    wlimit, col_tab_align, 1);
3781 		if (err)
3782 			goto done;
3783 		waddwstr(window, &wline[scrollx]);
3784 		wlimit -= width;
3785 		*wtotal += width;
3786 	}
3787 
3788 	if (wlimit > 0) {
3789 		int i = 0, w = 0;
3790 		size_t wlen;
3791 
3792 		free(wline);
3793 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3794 		    col_tab_align, 1);
3795 		if (err)
3796 			goto done;
3797 		wlen = wcslen(wline);
3798 		while (i < wlen) {
3799 			width = wcwidth(wline[i]);
3800 			if (width == -1) {
3801 				/* should not happen, tabs are expanded */
3802 				err = got_error(GOT_ERR_RANGE);
3803 				goto done;
3804 			}
3805 			if (width0 + w + width > skipcol)
3806 				break;
3807 			w += width;
3808 			i++;
3809 		}
3810 		/* draw (visible part of) matched token (if scrolled into it) */
3811 		if (width1 - w > 0) {
3812 			wattron(window, A_STANDOUT);
3813 			waddwstr(window, &wline[i]);
3814 			wattroff(window, A_STANDOUT);
3815 			wlimit -= (width1 - w);
3816 			*wtotal += (width1 - w);
3817 		}
3818 	}
3819 
3820 	if (wlimit > 0) {  /* draw rest of line */
3821 		free(wline);
3822 		if (skipcol > width0 + width1) {
3823 			err = format_line(&wline, &width2, &scrollx, seg2,
3824 			    skipcol - (width0 + width1), wlimit,
3825 			    col_tab_align, 1);
3826 			if (err)
3827 				goto done;
3828 			waddwstr(window, &wline[scrollx]);
3829 		} else {
3830 			err = format_line(&wline, &width2, NULL, seg2, 0,
3831 			    wlimit, col_tab_align, 1);
3832 			if (err)
3833 				goto done;
3834 			waddwstr(window, wline);
3835 		}
3836 		*wtotal += width2;
3837 	}
3838 done:
3839 	free(wline);
3840 	free(exstr);
3841 	free(seg0);
3842 	free(seg1);
3843 	free(seg2);
3844 	return err;
3845 }
3846 
3847 static const struct got_error *
3848 draw_file(struct tog_view *view, const char *header)
3849 {
3850 	struct tog_diff_view_state *s = &view->state.diff;
3851 	regmatch_t *regmatch = &view->regmatch;
3852 	const struct got_error *err;
3853 	int nprinted = 0;
3854 	char *line;
3855 	size_t linesize = 0;
3856 	ssize_t linelen;
3857 	struct tog_color *tc;
3858 	wchar_t *wline;
3859 	int width;
3860 	int max_lines = view->nlines;
3861 	int nlines = s->nlines;
3862 	off_t line_offset;
3863 
3864 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3865 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3866 		return got_error_from_errno("fseek");
3867 
3868 	werase(view->window);
3869 
3870 	if (header) {
3871 		if (asprintf(&line, "[%d/%d] %s",
3872 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3873 		    header) == -1)
3874 			return got_error_from_errno("asprintf");
3875 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3876 		    0, 0);
3877 		free(line);
3878 		if (err)
3879 			return err;
3880 
3881 		if (view_needs_focus_indication(view))
3882 			wstandout(view->window);
3883 		waddwstr(view->window, wline);
3884 		free(wline);
3885 		wline = NULL;
3886 		if (view_needs_focus_indication(view))
3887 			wstandend(view->window);
3888 		if (width <= view->ncols - 1)
3889 			waddch(view->window, '\n');
3890 
3891 		if (max_lines <= 1)
3892 			return NULL;
3893 		max_lines--;
3894 	}
3895 
3896 	s->eof = 0;
3897 	view->maxx = 0;
3898 	line = NULL;
3899 	while (max_lines > 0 && nprinted < max_lines) {
3900 		linelen = getline(&line, &linesize, s->f);
3901 		if (linelen == -1) {
3902 			if (feof(s->f)) {
3903 				s->eof = 1;
3904 				break;
3905 			}
3906 			free(line);
3907 			return got_ferror(s->f, GOT_ERR_IO);
3908 		}
3909 
3910 		/* Set view->maxx based on full line length. */
3911 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3912 		    view->x ? 1 : 0);
3913 		if (err) {
3914 			free(line);
3915 			return err;
3916 		}
3917 		view->maxx = MAX(view->maxx, width);
3918 		free(wline);
3919 		wline = NULL;
3920 
3921 		tc = match_color(&s->colors, line);
3922 		if (tc)
3923 			wattr_on(view->window,
3924 			    COLOR_PAIR(tc->colorpair), NULL);
3925 		if (s->first_displayed_line + nprinted == s->matched_line &&
3926 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3927 			err = add_matched_line(&width, line, view->ncols, 0,
3928 			    view->window, view->x, regmatch);
3929 			if (err) {
3930 				free(line);
3931 				return err;
3932 			}
3933 		} else {
3934 			int skip;
3935 			err = format_line(&wline, &width, &skip, line,
3936 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3937 			if (err) {
3938 				free(line);
3939 				return err;
3940 			}
3941 			waddwstr(view->window, &wline[skip]);
3942 			free(wline);
3943 			wline = NULL;
3944 		}
3945 		if (tc)
3946 			wattr_off(view->window,
3947 			    COLOR_PAIR(tc->colorpair), NULL);
3948 		if (width <= view->ncols - 1)
3949 			waddch(view->window, '\n');
3950 		nprinted++;
3951 	}
3952 	free(line);
3953 	if (nprinted >= 1)
3954 		s->last_displayed_line = s->first_displayed_line +
3955 		    (nprinted - 1);
3956 	else
3957 		s->last_displayed_line = s->first_displayed_line;
3958 
3959 	view_border(view);
3960 
3961 	if (s->eof) {
3962 		while (nprinted < view->nlines) {
3963 			waddch(view->window, '\n');
3964 			nprinted++;
3965 		}
3966 
3967 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3968 		    view->ncols, 0, 0);
3969 		if (err) {
3970 			return err;
3971 		}
3972 
3973 		wstandout(view->window);
3974 		waddwstr(view->window, wline);
3975 		free(wline);
3976 		wline = NULL;
3977 		wstandend(view->window);
3978 	}
3979 
3980 	return NULL;
3981 }
3982 
3983 static char *
3984 get_datestr(time_t *time, char *datebuf)
3985 {
3986 	struct tm mytm, *tm;
3987 	char *p, *s;
3988 
3989 	tm = gmtime_r(time, &mytm);
3990 	if (tm == NULL)
3991 		return NULL;
3992 	s = asctime_r(tm, datebuf);
3993 	if (s == NULL)
3994 		return NULL;
3995 	p = strchr(s, '\n');
3996 	if (p)
3997 		*p = '\0';
3998 	return s;
3999 }
4000 
4001 static const struct got_error *
4002 get_changed_paths(struct got_pathlist_head *paths,
4003     struct got_commit_object *commit, struct got_repository *repo)
4004 {
4005 	const struct got_error *err = NULL;
4006 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4007 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4008 	struct got_object_qid *qid;
4009 
4010 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4011 	if (qid != NULL) {
4012 		struct got_commit_object *pcommit;
4013 		err = got_object_open_as_commit(&pcommit, repo,
4014 		    &qid->id);
4015 		if (err)
4016 			return err;
4017 
4018 		tree_id1 = got_object_id_dup(
4019 		    got_object_commit_get_tree_id(pcommit));
4020 		if (tree_id1 == NULL) {
4021 			got_object_commit_close(pcommit);
4022 			return got_error_from_errno("got_object_id_dup");
4023 		}
4024 		got_object_commit_close(pcommit);
4025 
4026 	}
4027 
4028 	if (tree_id1) {
4029 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4030 		if (err)
4031 			goto done;
4032 	}
4033 
4034 	tree_id2 = got_object_commit_get_tree_id(commit);
4035 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4036 	if (err)
4037 		goto done;
4038 
4039 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4040 	    got_diff_tree_collect_changed_paths, paths, 0);
4041 done:
4042 	if (tree1)
4043 		got_object_tree_close(tree1);
4044 	if (tree2)
4045 		got_object_tree_close(tree2);
4046 	free(tree_id1);
4047 	return err;
4048 }
4049 
4050 static const struct got_error *
4051 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4052 {
4053 	off_t *p;
4054 
4055 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4056 	if (p == NULL)
4057 		return got_error_from_errno("reallocarray");
4058 	*line_offsets = p;
4059 	(*line_offsets)[*nlines] = off;
4060 	(*nlines)++;
4061 	return NULL;
4062 }
4063 
4064 static const struct got_error *
4065 write_commit_info(off_t **line_offsets, size_t *nlines,
4066     struct got_object_id *commit_id, struct got_reflist_head *refs,
4067     struct got_repository *repo, FILE *outfile)
4068 {
4069 	const struct got_error *err = NULL;
4070 	char datebuf[26], *datestr;
4071 	struct got_commit_object *commit;
4072 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4073 	time_t committer_time;
4074 	const char *author, *committer;
4075 	char *refs_str = NULL;
4076 	struct got_pathlist_head changed_paths;
4077 	struct got_pathlist_entry *pe;
4078 	off_t outoff = 0;
4079 	int n;
4080 
4081 	TAILQ_INIT(&changed_paths);
4082 
4083 	if (refs) {
4084 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4085 		if (err)
4086 			return err;
4087 	}
4088 
4089 	err = got_object_open_as_commit(&commit, repo, commit_id);
4090 	if (err)
4091 		return err;
4092 
4093 	err = got_object_id_str(&id_str, commit_id);
4094 	if (err) {
4095 		err = got_error_from_errno("got_object_id_str");
4096 		goto done;
4097 	}
4098 
4099 	err = add_line_offset(line_offsets, nlines, 0);
4100 	if (err)
4101 		goto done;
4102 
4103 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4104 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4105 	if (n < 0) {
4106 		err = got_error_from_errno("fprintf");
4107 		goto done;
4108 	}
4109 	outoff += n;
4110 	err = add_line_offset(line_offsets, nlines, outoff);
4111 	if (err)
4112 		goto done;
4113 
4114 	n = fprintf(outfile, "from: %s\n",
4115 	    got_object_commit_get_author(commit));
4116 	if (n < 0) {
4117 		err = got_error_from_errno("fprintf");
4118 		goto done;
4119 	}
4120 	outoff += n;
4121 	err = add_line_offset(line_offsets, nlines, outoff);
4122 	if (err)
4123 		goto done;
4124 
4125 	committer_time = got_object_commit_get_committer_time(commit);
4126 	datestr = get_datestr(&committer_time, datebuf);
4127 	if (datestr) {
4128 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4129 		if (n < 0) {
4130 			err = got_error_from_errno("fprintf");
4131 			goto done;
4132 		}
4133 		outoff += n;
4134 		err = add_line_offset(line_offsets, nlines, outoff);
4135 		if (err)
4136 			goto done;
4137 	}
4138 	author = got_object_commit_get_author(commit);
4139 	committer = got_object_commit_get_committer(commit);
4140 	if (strcmp(author, committer) != 0) {
4141 		n = fprintf(outfile, "via: %s\n", committer);
4142 		if (n < 0) {
4143 			err = got_error_from_errno("fprintf");
4144 			goto done;
4145 		}
4146 		outoff += n;
4147 		err = add_line_offset(line_offsets, nlines, outoff);
4148 		if (err)
4149 			goto done;
4150 	}
4151 	if (got_object_commit_get_nparents(commit) > 1) {
4152 		const struct got_object_id_queue *parent_ids;
4153 		struct got_object_qid *qid;
4154 		int pn = 1;
4155 		parent_ids = got_object_commit_get_parent_ids(commit);
4156 		STAILQ_FOREACH(qid, parent_ids, entry) {
4157 			err = got_object_id_str(&id_str, &qid->id);
4158 			if (err)
4159 				goto done;
4160 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4161 			if (n < 0) {
4162 				err = got_error_from_errno("fprintf");
4163 				goto done;
4164 			}
4165 			outoff += n;
4166 			err = add_line_offset(line_offsets, nlines, outoff);
4167 			if (err)
4168 				goto done;
4169 			free(id_str);
4170 			id_str = NULL;
4171 		}
4172 	}
4173 
4174 	err = got_object_commit_get_logmsg(&logmsg, commit);
4175 	if (err)
4176 		goto done;
4177 	s = logmsg;
4178 	while ((line = strsep(&s, "\n")) != NULL) {
4179 		n = fprintf(outfile, "%s\n", line);
4180 		if (n < 0) {
4181 			err = got_error_from_errno("fprintf");
4182 			goto done;
4183 		}
4184 		outoff += n;
4185 		err = add_line_offset(line_offsets, nlines, outoff);
4186 		if (err)
4187 			goto done;
4188 	}
4189 
4190 	err = get_changed_paths(&changed_paths, commit, repo);
4191 	if (err)
4192 		goto done;
4193 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4194 		struct got_diff_changed_path *cp = pe->data;
4195 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4196 		if (n < 0) {
4197 			err = got_error_from_errno("fprintf");
4198 			goto done;
4199 		}
4200 		outoff += n;
4201 		err = add_line_offset(line_offsets, nlines, outoff);
4202 		if (err)
4203 			goto done;
4204 		free((char *)pe->path);
4205 		free(pe->data);
4206 	}
4207 
4208 	fputc('\n', outfile);
4209 	outoff++;
4210 	err = add_line_offset(line_offsets, nlines, outoff);
4211 done:
4212 	got_pathlist_free(&changed_paths);
4213 	free(id_str);
4214 	free(logmsg);
4215 	free(refs_str);
4216 	got_object_commit_close(commit);
4217 	if (err) {
4218 		free(*line_offsets);
4219 		*line_offsets = NULL;
4220 		*nlines = 0;
4221 	}
4222 	return err;
4223 }
4224 
4225 static const struct got_error *
4226 create_diff(struct tog_diff_view_state *s)
4227 {
4228 	const struct got_error *err = NULL;
4229 	FILE *f = NULL;
4230 	int obj_type;
4231 
4232 	free(s->line_offsets);
4233 	s->line_offsets = malloc(sizeof(off_t));
4234 	if (s->line_offsets == NULL)
4235 		return got_error_from_errno("malloc");
4236 	s->nlines = 0;
4237 
4238 	f = got_opentemp();
4239 	if (f == NULL) {
4240 		err = got_error_from_errno("got_opentemp");
4241 		goto done;
4242 	}
4243 	if (s->f && fclose(s->f) == EOF) {
4244 		err = got_error_from_errno("fclose");
4245 		goto done;
4246 	}
4247 	s->f = f;
4248 
4249 	if (s->id1)
4250 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4251 	else
4252 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4253 	if (err)
4254 		goto done;
4255 
4256 	switch (obj_type) {
4257 	case GOT_OBJ_TYPE_BLOB:
4258 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4259 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4260 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4261 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4262 		break;
4263 	case GOT_OBJ_TYPE_TREE:
4264 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4265 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4266 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4267 		    s->force_text_diff, s->repo, s->f);
4268 		break;
4269 	case GOT_OBJ_TYPE_COMMIT: {
4270 		const struct got_object_id_queue *parent_ids;
4271 		struct got_object_qid *pid;
4272 		struct got_commit_object *commit2;
4273 		struct got_reflist_head *refs;
4274 
4275 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4276 		if (err)
4277 			goto done;
4278 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4279 		/* Show commit info if we're diffing to a parent/root commit. */
4280 		if (s->id1 == NULL) {
4281 			err = write_commit_info(&s->line_offsets, &s->nlines,
4282 			    s->id2, refs, s->repo, s->f);
4283 			if (err)
4284 				goto done;
4285 		} else {
4286 			parent_ids = got_object_commit_get_parent_ids(commit2);
4287 			STAILQ_FOREACH(pid, parent_ids, entry) {
4288 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4289 					err = write_commit_info(
4290 					    &s->line_offsets, &s->nlines,
4291 					    s->id2, refs, s->repo, s->f);
4292 					if (err)
4293 						goto done;
4294 					break;
4295 				}
4296 			}
4297 		}
4298 		got_object_commit_close(commit2);
4299 
4300 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4301 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4302 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4303 		    s->force_text_diff, s->repo, s->f);
4304 		break;
4305 	}
4306 	default:
4307 		err = got_error(GOT_ERR_OBJ_TYPE);
4308 		break;
4309 	}
4310 	if (err)
4311 		goto done;
4312 done:
4313 	if (s->f && fflush(s->f) != 0 && err == NULL)
4314 		err = got_error_from_errno("fflush");
4315 	return err;
4316 }
4317 
4318 static void
4319 diff_view_indicate_progress(struct tog_view *view)
4320 {
4321 	mvwaddstr(view->window, 0, 0, "diffing...");
4322 	update_panels();
4323 	doupdate();
4324 }
4325 
4326 static const struct got_error *
4327 search_start_diff_view(struct tog_view *view)
4328 {
4329 	struct tog_diff_view_state *s = &view->state.diff;
4330 
4331 	s->matched_line = 0;
4332 	return NULL;
4333 }
4334 
4335 static const struct got_error *
4336 search_next_diff_view(struct tog_view *view)
4337 {
4338 	struct tog_diff_view_state *s = &view->state.diff;
4339 	const struct got_error *err = NULL;
4340 	int lineno;
4341 	char *line = NULL;
4342 	size_t linesize = 0;
4343 	ssize_t linelen;
4344 
4345 	if (!view->searching) {
4346 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4347 		return NULL;
4348 	}
4349 
4350 	if (s->matched_line) {
4351 		if (view->searching == TOG_SEARCH_FORWARD)
4352 			lineno = s->matched_line + 1;
4353 		else
4354 			lineno = s->matched_line - 1;
4355 	} else
4356 		lineno = s->first_displayed_line;
4357 
4358 	while (1) {
4359 		off_t offset;
4360 
4361 		if (lineno <= 0 || lineno > s->nlines) {
4362 			if (s->matched_line == 0) {
4363 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4364 				break;
4365 			}
4366 
4367 			if (view->searching == TOG_SEARCH_FORWARD)
4368 				lineno = 1;
4369 			else
4370 				lineno = s->nlines;
4371 		}
4372 
4373 		offset = s->line_offsets[lineno - 1];
4374 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4375 			free(line);
4376 			return got_error_from_errno("fseeko");
4377 		}
4378 		linelen = getline(&line, &linesize, s->f);
4379 		if (linelen != -1) {
4380 			char *exstr;
4381 			err = expand_tab(&exstr, line);
4382 			if (err)
4383 				break;
4384 			if (match_line(exstr, &view->regex, 1,
4385 			    &view->regmatch)) {
4386 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4387 				s->matched_line = lineno;
4388 				free(exstr);
4389 				break;
4390 			}
4391 			free(exstr);
4392 		}
4393 		if (view->searching == TOG_SEARCH_FORWARD)
4394 			lineno++;
4395 		else
4396 			lineno--;
4397 	}
4398 	free(line);
4399 
4400 	if (s->matched_line) {
4401 		s->first_displayed_line = s->matched_line;
4402 		s->selected_line = 1;
4403 	}
4404 
4405 	return err;
4406 }
4407 
4408 static const struct got_error *
4409 close_diff_view(struct tog_view *view)
4410 {
4411 	const struct got_error *err = NULL;
4412 	struct tog_diff_view_state *s = &view->state.diff;
4413 
4414 	free(s->id1);
4415 	s->id1 = NULL;
4416 	free(s->id2);
4417 	s->id2 = NULL;
4418 	if (s->f && fclose(s->f) == EOF)
4419 		err = got_error_from_errno("fclose");
4420 	s->f = NULL;
4421 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4422 		err = got_error_from_errno("fclose");
4423 	s->f1 = NULL;
4424 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4425 		err = got_error_from_errno("fclose");
4426 	s->f2 = NULL;
4427 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4428 		err = got_error_from_errno("close");
4429 	s->fd1 = -1;
4430 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4431 		err = got_error_from_errno("close");
4432 	s->fd2 = -1;
4433 	free_colors(&s->colors);
4434 	free(s->line_offsets);
4435 	s->line_offsets = NULL;
4436 	s->nlines = 0;
4437 	return err;
4438 }
4439 
4440 static const struct got_error *
4441 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4442     struct got_object_id *id2, const char *label1, const char *label2,
4443     int diff_context, int ignore_whitespace, int force_text_diff,
4444     struct tog_view *parent_view, struct got_repository *repo)
4445 {
4446 	const struct got_error *err;
4447 	struct tog_diff_view_state *s = &view->state.diff;
4448 
4449 	memset(s, 0, sizeof(*s));
4450 	s->fd1 = -1;
4451 	s->fd2 = -1;
4452 
4453 	if (id1 != NULL && id2 != NULL) {
4454 	    int type1, type2;
4455 	    err = got_object_get_type(&type1, repo, id1);
4456 	    if (err)
4457 		return err;
4458 	    err = got_object_get_type(&type2, repo, id2);
4459 	    if (err)
4460 		return err;
4461 
4462 	    if (type1 != type2)
4463 		return got_error(GOT_ERR_OBJ_TYPE);
4464 	}
4465 	s->first_displayed_line = 1;
4466 	s->last_displayed_line = view->nlines;
4467 	s->selected_line = 1;
4468 	s->repo = repo;
4469 	s->id1 = id1;
4470 	s->id2 = id2;
4471 	s->label1 = label1;
4472 	s->label2 = label2;
4473 
4474 	if (id1) {
4475 		s->id1 = got_object_id_dup(id1);
4476 		if (s->id1 == NULL)
4477 			return got_error_from_errno("got_object_id_dup");
4478 	} else
4479 		s->id1 = NULL;
4480 
4481 	s->id2 = got_object_id_dup(id2);
4482 	if (s->id2 == NULL) {
4483 		err = got_error_from_errno("got_object_id_dup");
4484 		goto done;
4485 	}
4486 
4487 	s->f1 = got_opentemp();
4488 	if (s->f1 == NULL) {
4489 		err = got_error_from_errno("got_opentemp");
4490 		goto done;
4491 	}
4492 
4493 	s->f2 = got_opentemp();
4494 	if (s->f2 == NULL) {
4495 		err = got_error_from_errno("got_opentemp");
4496 		goto done;
4497 	}
4498 
4499 	s->fd1 = got_opentempfd();
4500 	if (s->fd1 == -1) {
4501 		err = got_error_from_errno("got_opentempfd");
4502 		goto done;
4503 	}
4504 
4505 	s->fd2 = got_opentempfd();
4506 	if (s->fd2 == -1) {
4507 		err = got_error_from_errno("got_opentempfd");
4508 		goto done;
4509 	}
4510 
4511 	s->first_displayed_line = 1;
4512 	s->last_displayed_line = view->nlines;
4513 	s->diff_context = diff_context;
4514 	s->ignore_whitespace = ignore_whitespace;
4515 	s->force_text_diff = force_text_diff;
4516 	s->parent_view = parent_view;
4517 	s->repo = repo;
4518 
4519 	STAILQ_INIT(&s->colors);
4520 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4521 		err = add_color(&s->colors,
4522 		    "^-", TOG_COLOR_DIFF_MINUS,
4523 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4524 		if (err)
4525 			goto done;
4526 		err = add_color(&s->colors, "^\\+",
4527 		    TOG_COLOR_DIFF_PLUS,
4528 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4529 		if (err)
4530 			goto done;
4531 		err = add_color(&s->colors,
4532 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4533 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4534 		if (err)
4535 			goto done;
4536 
4537 		err = add_color(&s->colors,
4538 		    "^(commit [0-9a-f]|parent [0-9]|"
4539 		    "(blob|file|tree|commit) [-+] |"
4540 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4541 		    get_color_value("TOG_COLOR_DIFF_META"));
4542 		if (err)
4543 			goto done;
4544 
4545 		err = add_color(&s->colors,
4546 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4547 		    get_color_value("TOG_COLOR_AUTHOR"));
4548 		if (err)
4549 			goto done;
4550 
4551 		err = add_color(&s->colors,
4552 		    "^date: ", TOG_COLOR_DATE,
4553 		    get_color_value("TOG_COLOR_DATE"));
4554 		if (err)
4555 			goto done;
4556 	}
4557 
4558 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4559 	    view_is_splitscreen(view))
4560 		show_log_view(parent_view); /* draw border */
4561 	diff_view_indicate_progress(view);
4562 
4563 	err = create_diff(s);
4564 
4565 	view->show = show_diff_view;
4566 	view->input = input_diff_view;
4567 	view->reset = reset_diff_view;
4568 	view->close = close_diff_view;
4569 	view->search_start = search_start_diff_view;
4570 	view->search_next = search_next_diff_view;
4571 done:
4572 	if (err)
4573 		close_diff_view(view);
4574 	return err;
4575 }
4576 
4577 static const struct got_error *
4578 show_diff_view(struct tog_view *view)
4579 {
4580 	const struct got_error *err;
4581 	struct tog_diff_view_state *s = &view->state.diff;
4582 	char *id_str1 = NULL, *id_str2, *header;
4583 	const char *label1, *label2;
4584 
4585 	if (s->id1) {
4586 		err = got_object_id_str(&id_str1, s->id1);
4587 		if (err)
4588 			return err;
4589 		label1 = s->label1 ? : id_str1;
4590 	} else
4591 		label1 = "/dev/null";
4592 
4593 	err = got_object_id_str(&id_str2, s->id2);
4594 	if (err)
4595 		return err;
4596 	label2 = s->label2 ? : id_str2;
4597 
4598 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4599 		err = got_error_from_errno("asprintf");
4600 		free(id_str1);
4601 		free(id_str2);
4602 		return err;
4603 	}
4604 	free(id_str1);
4605 	free(id_str2);
4606 
4607 	err = draw_file(view, header);
4608 	free(header);
4609 	return err;
4610 }
4611 
4612 static const struct got_error *
4613 set_selected_commit(struct tog_diff_view_state *s,
4614     struct commit_queue_entry *entry)
4615 {
4616 	const struct got_error *err;
4617 	const struct got_object_id_queue *parent_ids;
4618 	struct got_commit_object *selected_commit;
4619 	struct got_object_qid *pid;
4620 
4621 	free(s->id2);
4622 	s->id2 = got_object_id_dup(entry->id);
4623 	if (s->id2 == NULL)
4624 		return got_error_from_errno("got_object_id_dup");
4625 
4626 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4627 	if (err)
4628 		return err;
4629 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4630 	free(s->id1);
4631 	pid = STAILQ_FIRST(parent_ids);
4632 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4633 	got_object_commit_close(selected_commit);
4634 	return NULL;
4635 }
4636 
4637 static const struct got_error *
4638 reset_diff_view(struct tog_view *view)
4639 {
4640 	struct tog_diff_view_state *s = &view->state.diff;
4641 
4642 	view->count = 0;
4643 	wclear(view->window);
4644 	s->first_displayed_line = 1;
4645 	s->last_displayed_line = view->nlines;
4646 	s->matched_line = 0;
4647 	diff_view_indicate_progress(view);
4648 	return create_diff(s);
4649 }
4650 
4651 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4652     int, int, int);
4653 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4654     int, int);
4655 
4656 static const struct got_error *
4657 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4658 {
4659 	const struct got_error *err = NULL;
4660 	struct tog_diff_view_state *s = &view->state.diff;
4661 	struct tog_log_view_state *ls;
4662 	struct commit_queue_entry *old_selected_entry;
4663 	char *line = NULL;
4664 	size_t linesize = 0;
4665 	ssize_t linelen;
4666 	int i, nscroll = view->nlines - 1, up = 0;
4667 
4668 	switch (ch) {
4669 	case '0':
4670 		view->x = 0;
4671 		break;
4672 	case '$':
4673 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4674 		view->count = 0;
4675 		break;
4676 	case KEY_RIGHT:
4677 	case 'l':
4678 		if (view->x + view->ncols / 3 < view->maxx)
4679 			view->x += 2;  /* move two columns right */
4680 		else
4681 			view->count = 0;
4682 		break;
4683 	case KEY_LEFT:
4684 	case 'h':
4685 		view->x -= MIN(view->x, 2);  /* move two columns back */
4686 		if (view->x <= 0)
4687 			view->count = 0;
4688 		break;
4689 	case 'a':
4690 	case 'w':
4691 		if (ch == 'a')
4692 			s->force_text_diff = !s->force_text_diff;
4693 		if (ch == 'w')
4694 			s->ignore_whitespace = !s->ignore_whitespace;
4695 		err = reset_diff_view(view);
4696 		break;
4697 	case 'g':
4698 	case KEY_HOME:
4699 		s->first_displayed_line = 1;
4700 		view->count = 0;
4701 		break;
4702 	case 'G':
4703 	case KEY_END:
4704 		view->count = 0;
4705 		if (s->eof)
4706 			break;
4707 
4708 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4709 		s->eof = 1;
4710 		break;
4711 	case 'k':
4712 	case KEY_UP:
4713 	case CTRL('p'):
4714 		if (s->first_displayed_line > 1)
4715 			s->first_displayed_line--;
4716 		else
4717 			view->count = 0;
4718 		break;
4719 	case CTRL('u'):
4720 	case 'u':
4721 		nscroll /= 2;
4722 		/* FALL THROUGH */
4723 	case KEY_PPAGE:
4724 	case CTRL('b'):
4725 	case 'b':
4726 		if (s->first_displayed_line == 1) {
4727 			view->count = 0;
4728 			break;
4729 		}
4730 		i = 0;
4731 		while (i++ < nscroll && s->first_displayed_line > 1)
4732 			s->first_displayed_line--;
4733 		break;
4734 	case 'j':
4735 	case KEY_DOWN:
4736 	case CTRL('n'):
4737 		if (!s->eof)
4738 			s->first_displayed_line++;
4739 		else
4740 			view->count = 0;
4741 		break;
4742 	case CTRL('d'):
4743 	case 'd':
4744 		nscroll /= 2;
4745 		/* FALL THROUGH */
4746 	case KEY_NPAGE:
4747 	case CTRL('f'):
4748 	case 'f':
4749 	case ' ':
4750 		if (s->eof) {
4751 			view->count = 0;
4752 			break;
4753 		}
4754 		i = 0;
4755 		while (!s->eof && i++ < nscroll) {
4756 			linelen = getline(&line, &linesize, s->f);
4757 			s->first_displayed_line++;
4758 			if (linelen == -1) {
4759 				if (feof(s->f)) {
4760 					s->eof = 1;
4761 				} else
4762 					err = got_ferror(s->f, GOT_ERR_IO);
4763 				break;
4764 			}
4765 		}
4766 		free(line);
4767 		break;
4768 	case '[':
4769 		if (s->diff_context > 0) {
4770 			s->diff_context--;
4771 			s->matched_line = 0;
4772 			diff_view_indicate_progress(view);
4773 			err = create_diff(s);
4774 			if (s->first_displayed_line + view->nlines - 1 >
4775 			    s->nlines) {
4776 				s->first_displayed_line = 1;
4777 				s->last_displayed_line = view->nlines;
4778 			}
4779 		} else
4780 			view->count = 0;
4781 		break;
4782 	case ']':
4783 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4784 			s->diff_context++;
4785 			s->matched_line = 0;
4786 			diff_view_indicate_progress(view);
4787 			err = create_diff(s);
4788 		} else
4789 			view->count = 0;
4790 		break;
4791 	case '<':
4792 	case ',':
4793 	case 'K':
4794 		up = 1;
4795 		/* FALL THROUGH */
4796 	case '>':
4797 	case '.':
4798 	case 'J':
4799 		if (s->parent_view == NULL) {
4800 			view->count = 0;
4801 			break;
4802 		}
4803 		s->parent_view->count = view->count;
4804 
4805 		if (s->parent_view->type == TOG_VIEW_LOG) {
4806 			ls = &s->parent_view->state.log;
4807 			old_selected_entry = ls->selected_entry;
4808 
4809 			err = input_log_view(NULL, s->parent_view,
4810 			    up ? KEY_UP : KEY_DOWN);
4811 			if (err)
4812 				break;
4813 			view->count = s->parent_view->count;
4814 
4815 			if (old_selected_entry == ls->selected_entry)
4816 				break;
4817 
4818 			err = set_selected_commit(s, ls->selected_entry);
4819 			if (err)
4820 				break;
4821 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4822 			struct tog_blame_view_state *bs;
4823 			struct got_object_id *id, *prev_id;
4824 
4825 			bs = &s->parent_view->state.blame;
4826 			prev_id = get_annotation_for_line(bs->blame.lines,
4827 			    bs->blame.nlines, bs->last_diffed_line);
4828 
4829 			err = input_blame_view(&view, s->parent_view,
4830 			    up ? KEY_UP : KEY_DOWN);
4831 			if (err)
4832 				break;
4833 			view->count = s->parent_view->count;
4834 
4835 			if (prev_id == NULL)
4836 				break;
4837 			id = get_selected_commit_id(bs->blame.lines,
4838 			    bs->blame.nlines, bs->first_displayed_line,
4839 			    bs->selected_line);
4840 			if (id == NULL)
4841 				break;
4842 
4843 			if (!got_object_id_cmp(prev_id, id))
4844 				break;
4845 
4846 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4847 			if (err)
4848 				break;
4849 		}
4850 		s->first_displayed_line = 1;
4851 		s->last_displayed_line = view->nlines;
4852 		s->matched_line = 0;
4853 		view->x = 0;
4854 
4855 		diff_view_indicate_progress(view);
4856 		err = create_diff(s);
4857 		break;
4858 	default:
4859 		view->count = 0;
4860 		break;
4861 	}
4862 
4863 	return err;
4864 }
4865 
4866 static const struct got_error *
4867 cmd_diff(int argc, char *argv[])
4868 {
4869 	const struct got_error *error = NULL;
4870 	struct got_repository *repo = NULL;
4871 	struct got_worktree *worktree = NULL;
4872 	struct got_object_id *id1 = NULL, *id2 = NULL;
4873 	char *repo_path = NULL, *cwd = NULL;
4874 	char *id_str1 = NULL, *id_str2 = NULL;
4875 	char *label1 = NULL, *label2 = NULL;
4876 	int diff_context = 3, ignore_whitespace = 0;
4877 	int ch, force_text_diff = 0;
4878 	const char *errstr;
4879 	struct tog_view *view;
4880 	int *pack_fds = NULL;
4881 
4882 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4883 		switch (ch) {
4884 		case 'a':
4885 			force_text_diff = 1;
4886 			break;
4887 		case 'C':
4888 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4889 			    &errstr);
4890 			if (errstr != NULL)
4891 				errx(1, "number of context lines is %s: %s",
4892 				    errstr, errstr);
4893 			break;
4894 		case 'r':
4895 			repo_path = realpath(optarg, NULL);
4896 			if (repo_path == NULL)
4897 				return got_error_from_errno2("realpath",
4898 				    optarg);
4899 			got_path_strip_trailing_slashes(repo_path);
4900 			break;
4901 		case 'w':
4902 			ignore_whitespace = 1;
4903 			break;
4904 		default:
4905 			usage_diff();
4906 			/* NOTREACHED */
4907 		}
4908 	}
4909 
4910 	argc -= optind;
4911 	argv += optind;
4912 
4913 	if (argc == 0) {
4914 		usage_diff(); /* TODO show local worktree changes */
4915 	} else if (argc == 2) {
4916 		id_str1 = argv[0];
4917 		id_str2 = argv[1];
4918 	} else
4919 		usage_diff();
4920 
4921 	error = got_repo_pack_fds_open(&pack_fds);
4922 	if (error)
4923 		goto done;
4924 
4925 	if (repo_path == NULL) {
4926 		cwd = getcwd(NULL, 0);
4927 		if (cwd == NULL)
4928 			return got_error_from_errno("getcwd");
4929 		error = got_worktree_open(&worktree, cwd);
4930 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4931 			goto done;
4932 		if (worktree)
4933 			repo_path =
4934 			    strdup(got_worktree_get_repo_path(worktree));
4935 		else
4936 			repo_path = strdup(cwd);
4937 		if (repo_path == NULL) {
4938 			error = got_error_from_errno("strdup");
4939 			goto done;
4940 		}
4941 	}
4942 
4943 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4944 	if (error)
4945 		goto done;
4946 
4947 	init_curses();
4948 
4949 	error = apply_unveil(got_repo_get_path(repo), NULL);
4950 	if (error)
4951 		goto done;
4952 
4953 	error = tog_load_refs(repo, 0);
4954 	if (error)
4955 		goto done;
4956 
4957 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4958 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4959 	if (error)
4960 		goto done;
4961 
4962 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4963 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4964 	if (error)
4965 		goto done;
4966 
4967 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4968 	if (view == NULL) {
4969 		error = got_error_from_errno("view_open");
4970 		goto done;
4971 	}
4972 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4973 	    ignore_whitespace, force_text_diff, NULL,  repo);
4974 	if (error)
4975 		goto done;
4976 	error = view_loop(view);
4977 done:
4978 	free(label1);
4979 	free(label2);
4980 	free(repo_path);
4981 	free(cwd);
4982 	if (repo) {
4983 		const struct got_error *close_err = got_repo_close(repo);
4984 		if (error == NULL)
4985 			error = close_err;
4986 	}
4987 	if (worktree)
4988 		got_worktree_close(worktree);
4989 	if (pack_fds) {
4990 		const struct got_error *pack_err =
4991 		    got_repo_pack_fds_close(pack_fds);
4992 		if (error == NULL)
4993 			error = pack_err;
4994 	}
4995 	tog_free_refs();
4996 	return error;
4997 }
4998 
4999 __dead static void
5000 usage_blame(void)
5001 {
5002 	endwin();
5003 	fprintf(stderr,
5004 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5005 	    getprogname());
5006 	exit(1);
5007 }
5008 
5009 struct tog_blame_line {
5010 	int annotated;
5011 	struct got_object_id *id;
5012 };
5013 
5014 static const struct got_error *
5015 draw_blame(struct tog_view *view)
5016 {
5017 	struct tog_blame_view_state *s = &view->state.blame;
5018 	struct tog_blame *blame = &s->blame;
5019 	regmatch_t *regmatch = &view->regmatch;
5020 	const struct got_error *err;
5021 	int lineno = 0, nprinted = 0;
5022 	char *line = NULL;
5023 	size_t linesize = 0;
5024 	ssize_t linelen;
5025 	wchar_t *wline;
5026 	int width;
5027 	struct tog_blame_line *blame_line;
5028 	struct got_object_id *prev_id = NULL;
5029 	char *id_str;
5030 	struct tog_color *tc;
5031 
5032 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5033 	if (err)
5034 		return err;
5035 
5036 	rewind(blame->f);
5037 	werase(view->window);
5038 
5039 	if (asprintf(&line, "commit %s", id_str) == -1) {
5040 		err = got_error_from_errno("asprintf");
5041 		free(id_str);
5042 		return err;
5043 	}
5044 
5045 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5046 	free(line);
5047 	line = NULL;
5048 	if (err)
5049 		return err;
5050 	if (view_needs_focus_indication(view))
5051 		wstandout(view->window);
5052 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5053 	if (tc)
5054 		wattr_on(view->window,
5055 		    COLOR_PAIR(tc->colorpair), NULL);
5056 	waddwstr(view->window, wline);
5057 	if (tc)
5058 		wattr_off(view->window,
5059 		    COLOR_PAIR(tc->colorpair), NULL);
5060 	if (view_needs_focus_indication(view))
5061 		wstandend(view->window);
5062 	free(wline);
5063 	wline = NULL;
5064 	if (width < view->ncols - 1)
5065 		waddch(view->window, '\n');
5066 
5067 	if (asprintf(&line, "[%d/%d] %s%s",
5068 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5069 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5070 		free(id_str);
5071 		return got_error_from_errno("asprintf");
5072 	}
5073 	free(id_str);
5074 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5075 	free(line);
5076 	line = NULL;
5077 	if (err)
5078 		return err;
5079 	waddwstr(view->window, wline);
5080 	free(wline);
5081 	wline = NULL;
5082 	if (width < view->ncols - 1)
5083 		waddch(view->window, '\n');
5084 
5085 	s->eof = 0;
5086 	view->maxx = 0;
5087 	while (nprinted < view->nlines - 2) {
5088 		linelen = getline(&line, &linesize, blame->f);
5089 		if (linelen == -1) {
5090 			if (feof(blame->f)) {
5091 				s->eof = 1;
5092 				break;
5093 			}
5094 			free(line);
5095 			return got_ferror(blame->f, GOT_ERR_IO);
5096 		}
5097 		if (++lineno < s->first_displayed_line)
5098 			continue;
5099 
5100 		/* Set view->maxx based on full line length. */
5101 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5102 		if (err) {
5103 			free(line);
5104 			return err;
5105 		}
5106 		free(wline);
5107 		wline = NULL;
5108 		view->maxx = MAX(view->maxx, width);
5109 
5110 		if (nprinted == s->selected_line - 1)
5111 			wstandout(view->window);
5112 
5113 		if (blame->nlines > 0) {
5114 			blame_line = &blame->lines[lineno - 1];
5115 			if (blame_line->annotated && prev_id &&
5116 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5117 			    !(nprinted == s->selected_line - 1)) {
5118 				waddstr(view->window, "        ");
5119 			} else if (blame_line->annotated) {
5120 				char *id_str;
5121 				err = got_object_id_str(&id_str,
5122 				    blame_line->id);
5123 				if (err) {
5124 					free(line);
5125 					return err;
5126 				}
5127 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5128 				if (tc)
5129 					wattr_on(view->window,
5130 					    COLOR_PAIR(tc->colorpair), NULL);
5131 				wprintw(view->window, "%.8s", id_str);
5132 				if (tc)
5133 					wattr_off(view->window,
5134 					    COLOR_PAIR(tc->colorpair), NULL);
5135 				free(id_str);
5136 				prev_id = blame_line->id;
5137 			} else {
5138 				waddstr(view->window, "........");
5139 				prev_id = NULL;
5140 			}
5141 		} else {
5142 			waddstr(view->window, "........");
5143 			prev_id = NULL;
5144 		}
5145 
5146 		if (nprinted == s->selected_line - 1)
5147 			wstandend(view->window);
5148 		waddstr(view->window, " ");
5149 
5150 		if (view->ncols <= 9) {
5151 			width = 9;
5152 		} else if (s->first_displayed_line + nprinted ==
5153 		    s->matched_line &&
5154 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5155 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5156 			    view->window, view->x, regmatch);
5157 			if (err) {
5158 				free(line);
5159 				return err;
5160 			}
5161 			width += 9;
5162 		} else {
5163 			int skip;
5164 			err = format_line(&wline, &width, &skip, line,
5165 			    view->x, view->ncols - 9, 9, 1);
5166 			if (err) {
5167 				free(line);
5168 				return err;
5169 			}
5170 			waddwstr(view->window, &wline[skip]);
5171 			width += 9;
5172 			free(wline);
5173 			wline = NULL;
5174 		}
5175 
5176 		if (width <= view->ncols - 1)
5177 			waddch(view->window, '\n');
5178 		if (++nprinted == 1)
5179 			s->first_displayed_line = lineno;
5180 	}
5181 	free(line);
5182 	s->last_displayed_line = lineno;
5183 
5184 	view_border(view);
5185 
5186 	return NULL;
5187 }
5188 
5189 static const struct got_error *
5190 blame_cb(void *arg, int nlines, int lineno,
5191     struct got_commit_object *commit, struct got_object_id *id)
5192 {
5193 	const struct got_error *err = NULL;
5194 	struct tog_blame_cb_args *a = arg;
5195 	struct tog_blame_line *line;
5196 	int errcode;
5197 
5198 	if (nlines != a->nlines ||
5199 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5200 		return got_error(GOT_ERR_RANGE);
5201 
5202 	errcode = pthread_mutex_lock(&tog_mutex);
5203 	if (errcode)
5204 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5205 
5206 	if (*a->quit) {	/* user has quit the blame view */
5207 		err = got_error(GOT_ERR_ITER_COMPLETED);
5208 		goto done;
5209 	}
5210 
5211 	if (lineno == -1)
5212 		goto done; /* no change in this commit */
5213 
5214 	line = &a->lines[lineno - 1];
5215 	if (line->annotated)
5216 		goto done;
5217 
5218 	line->id = got_object_id_dup(id);
5219 	if (line->id == NULL) {
5220 		err = got_error_from_errno("got_object_id_dup");
5221 		goto done;
5222 	}
5223 	line->annotated = 1;
5224 done:
5225 	errcode = pthread_mutex_unlock(&tog_mutex);
5226 	if (errcode)
5227 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5228 	return err;
5229 }
5230 
5231 static void *
5232 blame_thread(void *arg)
5233 {
5234 	const struct got_error *err, *close_err;
5235 	struct tog_blame_thread_args *ta = arg;
5236 	struct tog_blame_cb_args *a = ta->cb_args;
5237 	int errcode, fd1 = -1, fd2 = -1;
5238 	FILE *f1 = NULL, *f2 = NULL;
5239 
5240 	fd1 = got_opentempfd();
5241 	if (fd1 == -1)
5242 		return (void *)got_error_from_errno("got_opentempfd");
5243 
5244 	fd2 = got_opentempfd();
5245 	if (fd2 == -1) {
5246 		err = got_error_from_errno("got_opentempfd");
5247 		goto done;
5248 	}
5249 
5250 	f1 = got_opentemp();
5251 	if (f1 == NULL) {
5252 		err = (void *)got_error_from_errno("got_opentemp");
5253 		goto done;
5254 	}
5255 	f2 = got_opentemp();
5256 	if (f2 == NULL) {
5257 		err = (void *)got_error_from_errno("got_opentemp");
5258 		goto done;
5259 	}
5260 
5261 	err = block_signals_used_by_main_thread();
5262 	if (err)
5263 		goto done;
5264 
5265 	err = got_blame(ta->path, a->commit_id, ta->repo,
5266 	    tog_diff_algo, blame_cb, ta->cb_args,
5267 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5268 	if (err && err->code == GOT_ERR_CANCELLED)
5269 		err = NULL;
5270 
5271 	errcode = pthread_mutex_lock(&tog_mutex);
5272 	if (errcode) {
5273 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5274 		goto done;
5275 	}
5276 
5277 	close_err = got_repo_close(ta->repo);
5278 	if (err == NULL)
5279 		err = close_err;
5280 	ta->repo = NULL;
5281 	*ta->complete = 1;
5282 
5283 	errcode = pthread_mutex_unlock(&tog_mutex);
5284 	if (errcode && err == NULL)
5285 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5286 
5287 done:
5288 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5289 		err = got_error_from_errno("close");
5290 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5291 		err = got_error_from_errno("close");
5292 	if (f1 && fclose(f1) == EOF && err == NULL)
5293 		err = got_error_from_errno("fclose");
5294 	if (f2 && fclose(f2) == EOF && err == NULL)
5295 		err = got_error_from_errno("fclose");
5296 
5297 	return (void *)err;
5298 }
5299 
5300 static struct got_object_id *
5301 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5302     int first_displayed_line, int selected_line)
5303 {
5304 	struct tog_blame_line *line;
5305 
5306 	if (nlines <= 0)
5307 		return NULL;
5308 
5309 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5310 	if (!line->annotated)
5311 		return NULL;
5312 
5313 	return line->id;
5314 }
5315 
5316 static struct got_object_id *
5317 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5318     int lineno)
5319 {
5320 	struct tog_blame_line *line;
5321 
5322 	if (nlines <= 0 || lineno >= nlines)
5323 		return NULL;
5324 
5325 	line = &lines[lineno - 1];
5326 	if (!line->annotated)
5327 		return NULL;
5328 
5329 	return line->id;
5330 }
5331 
5332 static const struct got_error *
5333 stop_blame(struct tog_blame *blame)
5334 {
5335 	const struct got_error *err = NULL;
5336 	int i;
5337 
5338 	if (blame->thread) {
5339 		int errcode;
5340 		errcode = pthread_mutex_unlock(&tog_mutex);
5341 		if (errcode)
5342 			return got_error_set_errno(errcode,
5343 			    "pthread_mutex_unlock");
5344 		errcode = pthread_join(blame->thread, (void **)&err);
5345 		if (errcode)
5346 			return got_error_set_errno(errcode, "pthread_join");
5347 		errcode = pthread_mutex_lock(&tog_mutex);
5348 		if (errcode)
5349 			return got_error_set_errno(errcode,
5350 			    "pthread_mutex_lock");
5351 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5352 			err = NULL;
5353 		blame->thread = 0; //NULL;
5354 	}
5355 	if (blame->thread_args.repo) {
5356 		const struct got_error *close_err;
5357 		close_err = got_repo_close(blame->thread_args.repo);
5358 		if (err == NULL)
5359 			err = close_err;
5360 		blame->thread_args.repo = NULL;
5361 	}
5362 	if (blame->f) {
5363 		if (fclose(blame->f) == EOF && err == NULL)
5364 			err = got_error_from_errno("fclose");
5365 		blame->f = NULL;
5366 	}
5367 	if (blame->lines) {
5368 		for (i = 0; i < blame->nlines; i++)
5369 			free(blame->lines[i].id);
5370 		free(blame->lines);
5371 		blame->lines = NULL;
5372 	}
5373 	free(blame->cb_args.commit_id);
5374 	blame->cb_args.commit_id = NULL;
5375 	if (blame->pack_fds) {
5376 		const struct got_error *pack_err =
5377 		    got_repo_pack_fds_close(blame->pack_fds);
5378 		if (err == NULL)
5379 			err = pack_err;
5380 		blame->pack_fds = NULL;
5381 	}
5382 	return err;
5383 }
5384 
5385 static const struct got_error *
5386 cancel_blame_view(void *arg)
5387 {
5388 	const struct got_error *err = NULL;
5389 	int *done = arg;
5390 	int errcode;
5391 
5392 	errcode = pthread_mutex_lock(&tog_mutex);
5393 	if (errcode)
5394 		return got_error_set_errno(errcode,
5395 		    "pthread_mutex_unlock");
5396 
5397 	if (*done)
5398 		err = got_error(GOT_ERR_CANCELLED);
5399 
5400 	errcode = pthread_mutex_unlock(&tog_mutex);
5401 	if (errcode)
5402 		return got_error_set_errno(errcode,
5403 		    "pthread_mutex_lock");
5404 
5405 	return err;
5406 }
5407 
5408 static const struct got_error *
5409 run_blame(struct tog_view *view)
5410 {
5411 	struct tog_blame_view_state *s = &view->state.blame;
5412 	struct tog_blame *blame = &s->blame;
5413 	const struct got_error *err = NULL;
5414 	struct got_commit_object *commit = NULL;
5415 	struct got_blob_object *blob = NULL;
5416 	struct got_repository *thread_repo = NULL;
5417 	struct got_object_id *obj_id = NULL;
5418 	int obj_type, fd = -1;
5419 	int *pack_fds = NULL;
5420 
5421 	err = got_object_open_as_commit(&commit, s->repo,
5422 	    &s->blamed_commit->id);
5423 	if (err)
5424 		return err;
5425 
5426 	fd = got_opentempfd();
5427 	if (fd == -1) {
5428 		err = got_error_from_errno("got_opentempfd");
5429 		goto done;
5430 	}
5431 
5432 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5433 	if (err)
5434 		goto done;
5435 
5436 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5437 	if (err)
5438 		goto done;
5439 
5440 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5441 		err = got_error(GOT_ERR_OBJ_TYPE);
5442 		goto done;
5443 	}
5444 
5445 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5446 	if (err)
5447 		goto done;
5448 	blame->f = got_opentemp();
5449 	if (blame->f == NULL) {
5450 		err = got_error_from_errno("got_opentemp");
5451 		goto done;
5452 	}
5453 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5454 	    &blame->line_offsets, blame->f, blob);
5455 	if (err)
5456 		goto done;
5457 	if (blame->nlines == 0) {
5458 		s->blame_complete = 1;
5459 		goto done;
5460 	}
5461 
5462 	/* Don't include \n at EOF in the blame line count. */
5463 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5464 		blame->nlines--;
5465 
5466 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5467 	if (blame->lines == NULL) {
5468 		err = got_error_from_errno("calloc");
5469 		goto done;
5470 	}
5471 
5472 	err = got_repo_pack_fds_open(&pack_fds);
5473 	if (err)
5474 		goto done;
5475 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5476 	    pack_fds);
5477 	if (err)
5478 		goto done;
5479 
5480 	blame->pack_fds = pack_fds;
5481 	blame->cb_args.view = view;
5482 	blame->cb_args.lines = blame->lines;
5483 	blame->cb_args.nlines = blame->nlines;
5484 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5485 	if (blame->cb_args.commit_id == NULL) {
5486 		err = got_error_from_errno("got_object_id_dup");
5487 		goto done;
5488 	}
5489 	blame->cb_args.quit = &s->done;
5490 
5491 	blame->thread_args.path = s->path;
5492 	blame->thread_args.repo = thread_repo;
5493 	blame->thread_args.cb_args = &blame->cb_args;
5494 	blame->thread_args.complete = &s->blame_complete;
5495 	blame->thread_args.cancel_cb = cancel_blame_view;
5496 	blame->thread_args.cancel_arg = &s->done;
5497 	s->blame_complete = 0;
5498 
5499 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5500 		s->first_displayed_line = 1;
5501 		s->last_displayed_line = view->nlines;
5502 		s->selected_line = 1;
5503 	}
5504 	s->matched_line = 0;
5505 
5506 done:
5507 	if (commit)
5508 		got_object_commit_close(commit);
5509 	if (fd != -1 && close(fd) == -1 && err == NULL)
5510 		err = got_error_from_errno("close");
5511 	if (blob)
5512 		got_object_blob_close(blob);
5513 	free(obj_id);
5514 	if (err)
5515 		stop_blame(blame);
5516 	return err;
5517 }
5518 
5519 static const struct got_error *
5520 open_blame_view(struct tog_view *view, char *path,
5521     struct got_object_id *commit_id, struct got_repository *repo)
5522 {
5523 	const struct got_error *err = NULL;
5524 	struct tog_blame_view_state *s = &view->state.blame;
5525 
5526 	STAILQ_INIT(&s->blamed_commits);
5527 
5528 	s->path = strdup(path);
5529 	if (s->path == NULL)
5530 		return got_error_from_errno("strdup");
5531 
5532 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5533 	if (err) {
5534 		free(s->path);
5535 		return err;
5536 	}
5537 
5538 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5539 	s->first_displayed_line = 1;
5540 	s->last_displayed_line = view->nlines;
5541 	s->selected_line = 1;
5542 	s->blame_complete = 0;
5543 	s->repo = repo;
5544 	s->commit_id = commit_id;
5545 	memset(&s->blame, 0, sizeof(s->blame));
5546 
5547 	STAILQ_INIT(&s->colors);
5548 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5549 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5550 		    get_color_value("TOG_COLOR_COMMIT"));
5551 		if (err)
5552 			return err;
5553 	}
5554 
5555 	view->show = show_blame_view;
5556 	view->input = input_blame_view;
5557 	view->reset = reset_blame_view;
5558 	view->close = close_blame_view;
5559 	view->search_start = search_start_blame_view;
5560 	view->search_next = search_next_blame_view;
5561 
5562 	return run_blame(view);
5563 }
5564 
5565 static const struct got_error *
5566 close_blame_view(struct tog_view *view)
5567 {
5568 	const struct got_error *err = NULL;
5569 	struct tog_blame_view_state *s = &view->state.blame;
5570 
5571 	if (s->blame.thread)
5572 		err = stop_blame(&s->blame);
5573 
5574 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5575 		struct got_object_qid *blamed_commit;
5576 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5577 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5578 		got_object_qid_free(blamed_commit);
5579 	}
5580 
5581 	free(s->path);
5582 	free_colors(&s->colors);
5583 	return err;
5584 }
5585 
5586 static const struct got_error *
5587 search_start_blame_view(struct tog_view *view)
5588 {
5589 	struct tog_blame_view_state *s = &view->state.blame;
5590 
5591 	s->matched_line = 0;
5592 	return NULL;
5593 }
5594 
5595 static const struct got_error *
5596 search_next_blame_view(struct tog_view *view)
5597 {
5598 	struct tog_blame_view_state *s = &view->state.blame;
5599 	const struct got_error *err = NULL;
5600 	int lineno;
5601 	char *line = NULL;
5602 	size_t linesize = 0;
5603 	ssize_t linelen;
5604 
5605 	if (!view->searching) {
5606 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5607 		return NULL;
5608 	}
5609 
5610 	if (s->matched_line) {
5611 		if (view->searching == TOG_SEARCH_FORWARD)
5612 			lineno = s->matched_line + 1;
5613 		else
5614 			lineno = s->matched_line - 1;
5615 	} else
5616 		lineno = s->first_displayed_line - 1 + s->selected_line;
5617 
5618 	while (1) {
5619 		off_t offset;
5620 
5621 		if (lineno <= 0 || lineno > s->blame.nlines) {
5622 			if (s->matched_line == 0) {
5623 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5624 				break;
5625 			}
5626 
5627 			if (view->searching == TOG_SEARCH_FORWARD)
5628 				lineno = 1;
5629 			else
5630 				lineno = s->blame.nlines;
5631 		}
5632 
5633 		offset = s->blame.line_offsets[lineno - 1];
5634 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5635 			free(line);
5636 			return got_error_from_errno("fseeko");
5637 		}
5638 		linelen = getline(&line, &linesize, s->blame.f);
5639 		if (linelen != -1) {
5640 			char *exstr;
5641 			err = expand_tab(&exstr, line);
5642 			if (err)
5643 				break;
5644 			if (match_line(exstr, &view->regex, 1,
5645 			    &view->regmatch)) {
5646 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5647 				s->matched_line = lineno;
5648 				free(exstr);
5649 				break;
5650 			}
5651 			free(exstr);
5652 		}
5653 		if (view->searching == TOG_SEARCH_FORWARD)
5654 			lineno++;
5655 		else
5656 			lineno--;
5657 	}
5658 	free(line);
5659 
5660 	if (s->matched_line) {
5661 		s->first_displayed_line = s->matched_line;
5662 		s->selected_line = 1;
5663 	}
5664 
5665 	return err;
5666 }
5667 
5668 static const struct got_error *
5669 show_blame_view(struct tog_view *view)
5670 {
5671 	const struct got_error *err = NULL;
5672 	struct tog_blame_view_state *s = &view->state.blame;
5673 	int errcode;
5674 
5675 	if (s->blame.thread == 0 && !s->blame_complete) {
5676 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5677 		    &s->blame.thread_args);
5678 		if (errcode)
5679 			return got_error_set_errno(errcode, "pthread_create");
5680 
5681 		halfdelay(1); /* fast refresh while annotating  */
5682 	}
5683 
5684 	if (s->blame_complete)
5685 		halfdelay(10); /* disable fast refresh */
5686 
5687 	err = draw_blame(view);
5688 
5689 	view_border(view);
5690 	return err;
5691 }
5692 
5693 static const struct got_error *
5694 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5695     struct got_repository *repo, struct got_object_id *id)
5696 {
5697 	struct tog_view		*log_view;
5698 	const struct got_error	*err = NULL;
5699 
5700 	*new_view = NULL;
5701 
5702 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5703 	if (log_view == NULL)
5704 		return got_error_from_errno("view_open");
5705 
5706 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5707 	if (err)
5708 		view_close(log_view);
5709 	else
5710 		*new_view = log_view;
5711 
5712 	return err;
5713 }
5714 
5715 static const struct got_error *
5716 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5717 {
5718 	const struct got_error *err = NULL, *thread_err = NULL;
5719 	struct tog_view *diff_view;
5720 	struct tog_blame_view_state *s = &view->state.blame;
5721 	int eos, nscroll, begin_y = 0, begin_x = 0;
5722 
5723 	eos = nscroll = view->nlines - 2;
5724 	if (view_is_hsplit_top(view))
5725 		--eos;  /* border */
5726 
5727 	switch (ch) {
5728 	case '0':
5729 		view->x = 0;
5730 		break;
5731 	case '$':
5732 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5733 		view->count = 0;
5734 		break;
5735 	case KEY_RIGHT:
5736 	case 'l':
5737 		if (view->x + view->ncols / 3 < view->maxx)
5738 			view->x += 2;  /* move two columns right */
5739 		else
5740 			view->count = 0;
5741 		break;
5742 	case KEY_LEFT:
5743 	case 'h':
5744 		view->x -= MIN(view->x, 2);  /* move two columns back */
5745 		if (view->x <= 0)
5746 			view->count = 0;
5747 		break;
5748 	case 'q':
5749 		s->done = 1;
5750 		break;
5751 	case 'g':
5752 	case KEY_HOME:
5753 		s->selected_line = 1;
5754 		s->first_displayed_line = 1;
5755 		view->count = 0;
5756 		break;
5757 	case 'G':
5758 	case KEY_END:
5759 		if (s->blame.nlines < eos) {
5760 			s->selected_line = s->blame.nlines;
5761 			s->first_displayed_line = 1;
5762 		} else {
5763 			s->selected_line = eos;
5764 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5765 		}
5766 		view->count = 0;
5767 		break;
5768 	case 'k':
5769 	case KEY_UP:
5770 	case CTRL('p'):
5771 		if (s->selected_line > 1)
5772 			s->selected_line--;
5773 		else if (s->selected_line == 1 &&
5774 		    s->first_displayed_line > 1)
5775 			s->first_displayed_line--;
5776 		else
5777 			view->count = 0;
5778 		break;
5779 	case CTRL('u'):
5780 	case 'u':
5781 		nscroll /= 2;
5782 		/* FALL THROUGH */
5783 	case KEY_PPAGE:
5784 	case CTRL('b'):
5785 	case 'b':
5786 		if (s->first_displayed_line == 1) {
5787 			if (view->count > 1)
5788 				nscroll += nscroll;
5789 			s->selected_line = MAX(1, s->selected_line - nscroll);
5790 			view->count = 0;
5791 			break;
5792 		}
5793 		if (s->first_displayed_line > nscroll)
5794 			s->first_displayed_line -= nscroll;
5795 		else
5796 			s->first_displayed_line = 1;
5797 		break;
5798 	case 'j':
5799 	case KEY_DOWN:
5800 	case CTRL('n'):
5801 		if (s->selected_line < eos && s->first_displayed_line +
5802 		    s->selected_line <= s->blame.nlines)
5803 			s->selected_line++;
5804 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5805 			s->first_displayed_line++;
5806 		else
5807 			view->count = 0;
5808 		break;
5809 	case 'c':
5810 	case 'p': {
5811 		struct got_object_id *id = NULL;
5812 
5813 		view->count = 0;
5814 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5815 		    s->first_displayed_line, s->selected_line);
5816 		if (id == NULL)
5817 			break;
5818 		if (ch == 'p') {
5819 			struct got_commit_object *commit, *pcommit;
5820 			struct got_object_qid *pid;
5821 			struct got_object_id *blob_id = NULL;
5822 			int obj_type;
5823 			err = got_object_open_as_commit(&commit,
5824 			    s->repo, id);
5825 			if (err)
5826 				break;
5827 			pid = STAILQ_FIRST(
5828 			    got_object_commit_get_parent_ids(commit));
5829 			if (pid == NULL) {
5830 				got_object_commit_close(commit);
5831 				break;
5832 			}
5833 			/* Check if path history ends here. */
5834 			err = got_object_open_as_commit(&pcommit,
5835 			    s->repo, &pid->id);
5836 			if (err)
5837 				break;
5838 			err = got_object_id_by_path(&blob_id, s->repo,
5839 			    pcommit, s->path);
5840 			got_object_commit_close(pcommit);
5841 			if (err) {
5842 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5843 					err = NULL;
5844 				got_object_commit_close(commit);
5845 				break;
5846 			}
5847 			err = got_object_get_type(&obj_type, s->repo,
5848 			    blob_id);
5849 			free(blob_id);
5850 			/* Can't blame non-blob type objects. */
5851 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5852 				got_object_commit_close(commit);
5853 				break;
5854 			}
5855 			err = got_object_qid_alloc(&s->blamed_commit,
5856 			    &pid->id);
5857 			got_object_commit_close(commit);
5858 		} else {
5859 			if (got_object_id_cmp(id,
5860 			    &s->blamed_commit->id) == 0)
5861 				break;
5862 			err = got_object_qid_alloc(&s->blamed_commit,
5863 			    id);
5864 		}
5865 		if (err)
5866 			break;
5867 		s->done = 1;
5868 		thread_err = stop_blame(&s->blame);
5869 		s->done = 0;
5870 		if (thread_err)
5871 			break;
5872 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5873 		    s->blamed_commit, entry);
5874 		err = run_blame(view);
5875 		if (err)
5876 			break;
5877 		break;
5878 	}
5879 	case 'C': {
5880 		struct got_object_qid *first;
5881 
5882 		view->count = 0;
5883 		first = STAILQ_FIRST(&s->blamed_commits);
5884 		if (!got_object_id_cmp(&first->id, s->commit_id))
5885 			break;
5886 		s->done = 1;
5887 		thread_err = stop_blame(&s->blame);
5888 		s->done = 0;
5889 		if (thread_err)
5890 			break;
5891 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5892 		got_object_qid_free(s->blamed_commit);
5893 		s->blamed_commit =
5894 		    STAILQ_FIRST(&s->blamed_commits);
5895 		err = run_blame(view);
5896 		if (err)
5897 			break;
5898 		break;
5899 	}
5900 	case 'L':
5901 		view->count = 0;
5902 		s->id_to_log = get_selected_commit_id(s->blame.lines,
5903 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
5904 		if (s->id_to_log)
5905 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
5906 		break;
5907 	case KEY_ENTER:
5908 	case '\r': {
5909 		struct got_object_id *id = NULL;
5910 		struct got_object_qid *pid;
5911 		struct got_commit_object *commit = NULL;
5912 
5913 		view->count = 0;
5914 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5915 		    s->first_displayed_line, s->selected_line);
5916 		if (id == NULL)
5917 			break;
5918 		err = got_object_open_as_commit(&commit, s->repo, id);
5919 		if (err)
5920 			break;
5921 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5922 		if (*new_view) {
5923 			/* traversed from diff view, release diff resources  */
5924 			err = close_diff_view(*new_view);
5925 			if (err)
5926 				break;
5927 			diff_view = *new_view;
5928 		} else {
5929 			if (view_is_parent_view(view))
5930 				view_get_split(view, &begin_y, &begin_x);
5931 
5932 			diff_view = view_open(0, 0, begin_y, begin_x,
5933 			    TOG_VIEW_DIFF);
5934 			if (diff_view == NULL) {
5935 				got_object_commit_close(commit);
5936 				err = got_error_from_errno("view_open");
5937 				break;
5938 			}
5939 		}
5940 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5941 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
5942 		got_object_commit_close(commit);
5943 		if (err) {
5944 			view_close(diff_view);
5945 			break;
5946 		}
5947 		s->last_diffed_line = s->first_displayed_line - 1 +
5948 		    s->selected_line;
5949 		if (*new_view)
5950 			break;	/* still open from active diff view */
5951 		if (view_is_parent_view(view) &&
5952 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5953 			err = view_init_hsplit(view, begin_y);
5954 			if (err)
5955 				break;
5956 		}
5957 
5958 		view->focussed = 0;
5959 		diff_view->focussed = 1;
5960 		diff_view->mode = view->mode;
5961 		diff_view->nlines = view->lines - begin_y;
5962 		if (view_is_parent_view(view)) {
5963 			view_transfer_size(diff_view, view);
5964 			err = view_close_child(view);
5965 			if (err)
5966 				break;
5967 			err = view_set_child(view, diff_view);
5968 			if (err)
5969 				break;
5970 			view->focus_child = 1;
5971 		} else
5972 			*new_view = diff_view;
5973 		if (err)
5974 			break;
5975 		break;
5976 	}
5977 	case CTRL('d'):
5978 	case 'd':
5979 		nscroll /= 2;
5980 		/* FALL THROUGH */
5981 	case KEY_NPAGE:
5982 	case CTRL('f'):
5983 	case 'f':
5984 	case ' ':
5985 		if (s->last_displayed_line >= s->blame.nlines &&
5986 		    s->selected_line >= MIN(s->blame.nlines,
5987 		    view->nlines - 2)) {
5988 			view->count = 0;
5989 			break;
5990 		}
5991 		if (s->last_displayed_line >= s->blame.nlines &&
5992 		    s->selected_line < view->nlines - 2) {
5993 			s->selected_line +=
5994 			    MIN(nscroll, s->last_displayed_line -
5995 			    s->first_displayed_line - s->selected_line + 1);
5996 		}
5997 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5998 			s->first_displayed_line += nscroll;
5999 		else
6000 			s->first_displayed_line =
6001 			    s->blame.nlines - (view->nlines - 3);
6002 		break;
6003 	case KEY_RESIZE:
6004 		if (s->selected_line > view->nlines - 2) {
6005 			s->selected_line = MIN(s->blame.nlines,
6006 			    view->nlines - 2);
6007 		}
6008 		break;
6009 	default:
6010 		view->count = 0;
6011 		break;
6012 	}
6013 	return thread_err ? thread_err : err;
6014 }
6015 
6016 static const struct got_error *
6017 reset_blame_view(struct tog_view *view)
6018 {
6019 	const struct got_error *err;
6020 	struct tog_blame_view_state *s = &view->state.blame;
6021 
6022 	view->count = 0;
6023 	s->done = 1;
6024 	err = stop_blame(&s->blame);
6025 	s->done = 0;
6026 	if (err)
6027 		return err;
6028 	return run_blame(view);
6029 }
6030 
6031 static const struct got_error *
6032 cmd_blame(int argc, char *argv[])
6033 {
6034 	const struct got_error *error;
6035 	struct got_repository *repo = NULL;
6036 	struct got_worktree *worktree = NULL;
6037 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6038 	char *link_target = NULL;
6039 	struct got_object_id *commit_id = NULL;
6040 	struct got_commit_object *commit = NULL;
6041 	char *commit_id_str = NULL;
6042 	int ch;
6043 	struct tog_view *view;
6044 	int *pack_fds = NULL;
6045 
6046 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6047 		switch (ch) {
6048 		case 'c':
6049 			commit_id_str = optarg;
6050 			break;
6051 		case 'r':
6052 			repo_path = realpath(optarg, NULL);
6053 			if (repo_path == NULL)
6054 				return got_error_from_errno2("realpath",
6055 				    optarg);
6056 			break;
6057 		default:
6058 			usage_blame();
6059 			/* NOTREACHED */
6060 		}
6061 	}
6062 
6063 	argc -= optind;
6064 	argv += optind;
6065 
6066 	if (argc != 1)
6067 		usage_blame();
6068 
6069 	error = got_repo_pack_fds_open(&pack_fds);
6070 	if (error != NULL)
6071 		goto done;
6072 
6073 	if (repo_path == NULL) {
6074 		cwd = getcwd(NULL, 0);
6075 		if (cwd == NULL)
6076 			return got_error_from_errno("getcwd");
6077 		error = got_worktree_open(&worktree, cwd);
6078 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6079 			goto done;
6080 		if (worktree)
6081 			repo_path =
6082 			    strdup(got_worktree_get_repo_path(worktree));
6083 		else
6084 			repo_path = strdup(cwd);
6085 		if (repo_path == NULL) {
6086 			error = got_error_from_errno("strdup");
6087 			goto done;
6088 		}
6089 	}
6090 
6091 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6092 	if (error != NULL)
6093 		goto done;
6094 
6095 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6096 	    worktree);
6097 	if (error)
6098 		goto done;
6099 
6100 	init_curses();
6101 
6102 	error = apply_unveil(got_repo_get_path(repo), NULL);
6103 	if (error)
6104 		goto done;
6105 
6106 	error = tog_load_refs(repo, 0);
6107 	if (error)
6108 		goto done;
6109 
6110 	if (commit_id_str == NULL) {
6111 		struct got_reference *head_ref;
6112 		error = got_ref_open(&head_ref, repo, worktree ?
6113 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6114 		if (error != NULL)
6115 			goto done;
6116 		error = got_ref_resolve(&commit_id, repo, head_ref);
6117 		got_ref_close(head_ref);
6118 	} else {
6119 		error = got_repo_match_object_id(&commit_id, NULL,
6120 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6121 	}
6122 	if (error != NULL)
6123 		goto done;
6124 
6125 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6126 	if (view == NULL) {
6127 		error = got_error_from_errno("view_open");
6128 		goto done;
6129 	}
6130 
6131 	error = got_object_open_as_commit(&commit, repo, commit_id);
6132 	if (error)
6133 		goto done;
6134 
6135 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6136 	    commit, repo);
6137 	if (error)
6138 		goto done;
6139 
6140 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6141 	    commit_id, repo);
6142 	if (error)
6143 		goto done;
6144 	if (worktree) {
6145 		/* Release work tree lock. */
6146 		got_worktree_close(worktree);
6147 		worktree = NULL;
6148 	}
6149 	error = view_loop(view);
6150 done:
6151 	free(repo_path);
6152 	free(in_repo_path);
6153 	free(link_target);
6154 	free(cwd);
6155 	free(commit_id);
6156 	if (commit)
6157 		got_object_commit_close(commit);
6158 	if (worktree)
6159 		got_worktree_close(worktree);
6160 	if (repo) {
6161 		const struct got_error *close_err = got_repo_close(repo);
6162 		if (error == NULL)
6163 			error = close_err;
6164 	}
6165 	if (pack_fds) {
6166 		const struct got_error *pack_err =
6167 		    got_repo_pack_fds_close(pack_fds);
6168 		if (error == NULL)
6169 			error = pack_err;
6170 	}
6171 	tog_free_refs();
6172 	return error;
6173 }
6174 
6175 static const struct got_error *
6176 draw_tree_entries(struct tog_view *view, const char *parent_path)
6177 {
6178 	struct tog_tree_view_state *s = &view->state.tree;
6179 	const struct got_error *err = NULL;
6180 	struct got_tree_entry *te;
6181 	wchar_t *wline;
6182 	struct tog_color *tc;
6183 	int width, n, i, nentries;
6184 	int limit = view->nlines;
6185 
6186 	s->ndisplayed = 0;
6187 	if (view_is_hsplit_top(view))
6188 		--limit;  /* border */
6189 
6190 	werase(view->window);
6191 
6192 	if (limit == 0)
6193 		return NULL;
6194 
6195 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6196 	    0, 0);
6197 	if (err)
6198 		return err;
6199 	if (view_needs_focus_indication(view))
6200 		wstandout(view->window);
6201 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6202 	if (tc)
6203 		wattr_on(view->window,
6204 		    COLOR_PAIR(tc->colorpair), NULL);
6205 	waddwstr(view->window, wline);
6206 	if (tc)
6207 		wattr_off(view->window,
6208 		    COLOR_PAIR(tc->colorpair), NULL);
6209 	if (view_needs_focus_indication(view))
6210 		wstandend(view->window);
6211 	free(wline);
6212 	wline = NULL;
6213 	if (width < view->ncols - 1)
6214 		waddch(view->window, '\n');
6215 	if (--limit <= 0)
6216 		return NULL;
6217 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6218 	    0, 0);
6219 	if (err)
6220 		return err;
6221 	waddwstr(view->window, wline);
6222 	free(wline);
6223 	wline = NULL;
6224 	if (width < view->ncols - 1)
6225 		waddch(view->window, '\n');
6226 	if (--limit <= 0)
6227 		return NULL;
6228 	waddch(view->window, '\n');
6229 	if (--limit <= 0)
6230 		return NULL;
6231 
6232 	if (s->first_displayed_entry == NULL) {
6233 		te = got_object_tree_get_first_entry(s->tree);
6234 		if (s->selected == 0) {
6235 			if (view->focussed)
6236 				wstandout(view->window);
6237 			s->selected_entry = NULL;
6238 		}
6239 		waddstr(view->window, "  ..\n");	/* parent directory */
6240 		if (s->selected == 0 && view->focussed)
6241 			wstandend(view->window);
6242 		s->ndisplayed++;
6243 		if (--limit <= 0)
6244 			return NULL;
6245 		n = 1;
6246 	} else {
6247 		n = 0;
6248 		te = s->first_displayed_entry;
6249 	}
6250 
6251 	nentries = got_object_tree_get_nentries(s->tree);
6252 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6253 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6254 		const char *modestr = "";
6255 		mode_t mode;
6256 
6257 		te = got_object_tree_get_entry(s->tree, i);
6258 		mode = got_tree_entry_get_mode(te);
6259 
6260 		if (s->show_ids) {
6261 			err = got_object_id_str(&id_str,
6262 			    got_tree_entry_get_id(te));
6263 			if (err)
6264 				return got_error_from_errno(
6265 				    "got_object_id_str");
6266 		}
6267 		if (got_object_tree_entry_is_submodule(te))
6268 			modestr = "$";
6269 		else if (S_ISLNK(mode)) {
6270 			int i;
6271 
6272 			err = got_tree_entry_get_symlink_target(&link_target,
6273 			    te, s->repo);
6274 			if (err) {
6275 				free(id_str);
6276 				return err;
6277 			}
6278 			for (i = 0; i < strlen(link_target); i++) {
6279 				if (!isprint((unsigned char)link_target[i]))
6280 					link_target[i] = '?';
6281 			}
6282 			modestr = "@";
6283 		}
6284 		else if (S_ISDIR(mode))
6285 			modestr = "/";
6286 		else if (mode & S_IXUSR)
6287 			modestr = "*";
6288 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6289 		    got_tree_entry_get_name(te), modestr,
6290 		    link_target ? " -> ": "",
6291 		    link_target ? link_target : "") == -1) {
6292 			free(id_str);
6293 			free(link_target);
6294 			return got_error_from_errno("asprintf");
6295 		}
6296 		free(id_str);
6297 		free(link_target);
6298 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6299 		    0, 0);
6300 		if (err) {
6301 			free(line);
6302 			break;
6303 		}
6304 		if (n == s->selected) {
6305 			if (view->focussed)
6306 				wstandout(view->window);
6307 			s->selected_entry = te;
6308 		}
6309 		tc = match_color(&s->colors, line);
6310 		if (tc)
6311 			wattr_on(view->window,
6312 			    COLOR_PAIR(tc->colorpair), NULL);
6313 		waddwstr(view->window, wline);
6314 		if (tc)
6315 			wattr_off(view->window,
6316 			    COLOR_PAIR(tc->colorpair), NULL);
6317 		if (width < view->ncols - 1)
6318 			waddch(view->window, '\n');
6319 		if (n == s->selected && view->focussed)
6320 			wstandend(view->window);
6321 		free(line);
6322 		free(wline);
6323 		wline = NULL;
6324 		n++;
6325 		s->ndisplayed++;
6326 		s->last_displayed_entry = te;
6327 		if (--limit <= 0)
6328 			break;
6329 	}
6330 
6331 	return err;
6332 }
6333 
6334 static void
6335 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6336 {
6337 	struct got_tree_entry *te;
6338 	int isroot = s->tree == s->root;
6339 	int i = 0;
6340 
6341 	if (s->first_displayed_entry == NULL)
6342 		return;
6343 
6344 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6345 	while (i++ < maxscroll) {
6346 		if (te == NULL) {
6347 			if (!isroot)
6348 				s->first_displayed_entry = NULL;
6349 			break;
6350 		}
6351 		s->first_displayed_entry = te;
6352 		te = got_tree_entry_get_prev(s->tree, te);
6353 	}
6354 }
6355 
6356 static const struct got_error *
6357 tree_scroll_down(struct tog_view *view, int maxscroll)
6358 {
6359 	struct tog_tree_view_state *s = &view->state.tree;
6360 	struct got_tree_entry *next, *last;
6361 	int n = 0;
6362 
6363 	if (s->first_displayed_entry)
6364 		next = got_tree_entry_get_next(s->tree,
6365 		    s->first_displayed_entry);
6366 	else
6367 		next = got_object_tree_get_first_entry(s->tree);
6368 
6369 	last = s->last_displayed_entry;
6370 	while (next && n++ < maxscroll) {
6371 		if (last)
6372 			last = got_tree_entry_get_next(s->tree, last);
6373 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6374 			s->first_displayed_entry = next;
6375 			next = got_tree_entry_get_next(s->tree, next);
6376 		}
6377 	}
6378 
6379 	return NULL;
6380 }
6381 
6382 static const struct got_error *
6383 tree_entry_path(char **path, struct tog_parent_trees *parents,
6384     struct got_tree_entry *te)
6385 {
6386 	const struct got_error *err = NULL;
6387 	struct tog_parent_tree *pt;
6388 	size_t len = 2; /* for leading slash and NUL */
6389 
6390 	TAILQ_FOREACH(pt, parents, entry)
6391 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6392 		    + 1 /* slash */;
6393 	if (te)
6394 		len += strlen(got_tree_entry_get_name(te));
6395 
6396 	*path = calloc(1, len);
6397 	if (path == NULL)
6398 		return got_error_from_errno("calloc");
6399 
6400 	(*path)[0] = '/';
6401 	pt = TAILQ_LAST(parents, tog_parent_trees);
6402 	while (pt) {
6403 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6404 		if (strlcat(*path, name, len) >= len) {
6405 			err = got_error(GOT_ERR_NO_SPACE);
6406 			goto done;
6407 		}
6408 		if (strlcat(*path, "/", len) >= len) {
6409 			err = got_error(GOT_ERR_NO_SPACE);
6410 			goto done;
6411 		}
6412 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6413 	}
6414 	if (te) {
6415 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6416 			err = got_error(GOT_ERR_NO_SPACE);
6417 			goto done;
6418 		}
6419 	}
6420 done:
6421 	if (err) {
6422 		free(*path);
6423 		*path = NULL;
6424 	}
6425 	return err;
6426 }
6427 
6428 static const struct got_error *
6429 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6430     struct got_tree_entry *te, struct tog_parent_trees *parents,
6431     struct got_object_id *commit_id, struct got_repository *repo)
6432 {
6433 	const struct got_error *err = NULL;
6434 	char *path;
6435 	struct tog_view *blame_view;
6436 
6437 	*new_view = NULL;
6438 
6439 	err = tree_entry_path(&path, parents, te);
6440 	if (err)
6441 		return err;
6442 
6443 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6444 	if (blame_view == NULL) {
6445 		err = got_error_from_errno("view_open");
6446 		goto done;
6447 	}
6448 
6449 	err = open_blame_view(blame_view, path, commit_id, repo);
6450 	if (err) {
6451 		if (err->code == GOT_ERR_CANCELLED)
6452 			err = NULL;
6453 		view_close(blame_view);
6454 	} else
6455 		*new_view = blame_view;
6456 done:
6457 	free(path);
6458 	return err;
6459 }
6460 
6461 static const struct got_error *
6462 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6463     struct tog_tree_view_state *s)
6464 {
6465 	struct tog_view *log_view;
6466 	const struct got_error *err = NULL;
6467 	char *path;
6468 
6469 	*new_view = NULL;
6470 
6471 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6472 	if (log_view == NULL)
6473 		return got_error_from_errno("view_open");
6474 
6475 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6476 	if (err)
6477 		return err;
6478 
6479 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6480 	    path, 0);
6481 	if (err)
6482 		view_close(log_view);
6483 	else
6484 		*new_view = log_view;
6485 	free(path);
6486 	return err;
6487 }
6488 
6489 static const struct got_error *
6490 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6491     const char *head_ref_name, struct got_repository *repo)
6492 {
6493 	const struct got_error *err = NULL;
6494 	char *commit_id_str = NULL;
6495 	struct tog_tree_view_state *s = &view->state.tree;
6496 	struct got_commit_object *commit = NULL;
6497 
6498 	TAILQ_INIT(&s->parents);
6499 	STAILQ_INIT(&s->colors);
6500 
6501 	s->commit_id = got_object_id_dup(commit_id);
6502 	if (s->commit_id == NULL)
6503 		return got_error_from_errno("got_object_id_dup");
6504 
6505 	err = got_object_open_as_commit(&commit, repo, commit_id);
6506 	if (err)
6507 		goto done;
6508 
6509 	/*
6510 	 * The root is opened here and will be closed when the view is closed.
6511 	 * Any visited subtrees and their path-wise parents are opened and
6512 	 * closed on demand.
6513 	 */
6514 	err = got_object_open_as_tree(&s->root, repo,
6515 	    got_object_commit_get_tree_id(commit));
6516 	if (err)
6517 		goto done;
6518 	s->tree = s->root;
6519 
6520 	err = got_object_id_str(&commit_id_str, commit_id);
6521 	if (err != NULL)
6522 		goto done;
6523 
6524 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6525 		err = got_error_from_errno("asprintf");
6526 		goto done;
6527 	}
6528 
6529 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6530 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6531 	if (head_ref_name) {
6532 		s->head_ref_name = strdup(head_ref_name);
6533 		if (s->head_ref_name == NULL) {
6534 			err = got_error_from_errno("strdup");
6535 			goto done;
6536 		}
6537 	}
6538 	s->repo = repo;
6539 
6540 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6541 		err = add_color(&s->colors, "\\$$",
6542 		    TOG_COLOR_TREE_SUBMODULE,
6543 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6544 		if (err)
6545 			goto done;
6546 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6547 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6548 		if (err)
6549 			goto done;
6550 		err = add_color(&s->colors, "/$",
6551 		    TOG_COLOR_TREE_DIRECTORY,
6552 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6553 		if (err)
6554 			goto done;
6555 
6556 		err = add_color(&s->colors, "\\*$",
6557 		    TOG_COLOR_TREE_EXECUTABLE,
6558 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6559 		if (err)
6560 			goto done;
6561 
6562 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6563 		    get_color_value("TOG_COLOR_COMMIT"));
6564 		if (err)
6565 			goto done;
6566 	}
6567 
6568 	view->show = show_tree_view;
6569 	view->input = input_tree_view;
6570 	view->close = close_tree_view;
6571 	view->search_start = search_start_tree_view;
6572 	view->search_next = search_next_tree_view;
6573 done:
6574 	free(commit_id_str);
6575 	if (commit)
6576 		got_object_commit_close(commit);
6577 	if (err)
6578 		close_tree_view(view);
6579 	return err;
6580 }
6581 
6582 static const struct got_error *
6583 close_tree_view(struct tog_view *view)
6584 {
6585 	struct tog_tree_view_state *s = &view->state.tree;
6586 
6587 	free_colors(&s->colors);
6588 	free(s->tree_label);
6589 	s->tree_label = NULL;
6590 	free(s->commit_id);
6591 	s->commit_id = NULL;
6592 	free(s->head_ref_name);
6593 	s->head_ref_name = NULL;
6594 	while (!TAILQ_EMPTY(&s->parents)) {
6595 		struct tog_parent_tree *parent;
6596 		parent = TAILQ_FIRST(&s->parents);
6597 		TAILQ_REMOVE(&s->parents, parent, entry);
6598 		if (parent->tree != s->root)
6599 			got_object_tree_close(parent->tree);
6600 		free(parent);
6601 
6602 	}
6603 	if (s->tree != NULL && s->tree != s->root)
6604 		got_object_tree_close(s->tree);
6605 	if (s->root)
6606 		got_object_tree_close(s->root);
6607 	return NULL;
6608 }
6609 
6610 static const struct got_error *
6611 search_start_tree_view(struct tog_view *view)
6612 {
6613 	struct tog_tree_view_state *s = &view->state.tree;
6614 
6615 	s->matched_entry = NULL;
6616 	return NULL;
6617 }
6618 
6619 static int
6620 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6621 {
6622 	regmatch_t regmatch;
6623 
6624 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6625 	    0) == 0;
6626 }
6627 
6628 static const struct got_error *
6629 search_next_tree_view(struct tog_view *view)
6630 {
6631 	struct tog_tree_view_state *s = &view->state.tree;
6632 	struct got_tree_entry *te = NULL;
6633 
6634 	if (!view->searching) {
6635 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6636 		return NULL;
6637 	}
6638 
6639 	if (s->matched_entry) {
6640 		if (view->searching == TOG_SEARCH_FORWARD) {
6641 			if (s->selected_entry)
6642 				te = got_tree_entry_get_next(s->tree,
6643 				    s->selected_entry);
6644 			else
6645 				te = got_object_tree_get_first_entry(s->tree);
6646 		} else {
6647 			if (s->selected_entry == NULL)
6648 				te = got_object_tree_get_last_entry(s->tree);
6649 			else
6650 				te = got_tree_entry_get_prev(s->tree,
6651 				    s->selected_entry);
6652 		}
6653 	} else {
6654 		if (s->selected_entry)
6655 			te = s->selected_entry;
6656 		else if (view->searching == TOG_SEARCH_FORWARD)
6657 			te = got_object_tree_get_first_entry(s->tree);
6658 		else
6659 			te = got_object_tree_get_last_entry(s->tree);
6660 	}
6661 
6662 	while (1) {
6663 		if (te == NULL) {
6664 			if (s->matched_entry == NULL) {
6665 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6666 				return NULL;
6667 			}
6668 			if (view->searching == TOG_SEARCH_FORWARD)
6669 				te = got_object_tree_get_first_entry(s->tree);
6670 			else
6671 				te = got_object_tree_get_last_entry(s->tree);
6672 		}
6673 
6674 		if (match_tree_entry(te, &view->regex)) {
6675 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6676 			s->matched_entry = te;
6677 			break;
6678 		}
6679 
6680 		if (view->searching == TOG_SEARCH_FORWARD)
6681 			te = got_tree_entry_get_next(s->tree, te);
6682 		else
6683 			te = got_tree_entry_get_prev(s->tree, te);
6684 	}
6685 
6686 	if (s->matched_entry) {
6687 		s->first_displayed_entry = s->matched_entry;
6688 		s->selected = 0;
6689 	}
6690 
6691 	return NULL;
6692 }
6693 
6694 static const struct got_error *
6695 show_tree_view(struct tog_view *view)
6696 {
6697 	const struct got_error *err = NULL;
6698 	struct tog_tree_view_state *s = &view->state.tree;
6699 	char *parent_path;
6700 
6701 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6702 	if (err)
6703 		return err;
6704 
6705 	err = draw_tree_entries(view, parent_path);
6706 	free(parent_path);
6707 
6708 	view_border(view);
6709 	return err;
6710 }
6711 
6712 static const struct got_error *
6713 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6714 {
6715 	const struct got_error *err = NULL;
6716 	struct tog_tree_view_state *s = &view->state.tree;
6717 	struct got_tree_entry *te;
6718 	int n, nscroll = view->nlines - 3;
6719 
6720 	switch (ch) {
6721 	case 'i':
6722 		s->show_ids = !s->show_ids;
6723 		view->count = 0;
6724 		break;
6725 	case 'L':
6726 		view->count = 0;
6727 		if (!s->selected_entry)
6728 			break;
6729 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
6730 		break;
6731 	case 'R':
6732 		view->count = 0;
6733 		err = view_request_new(new_view, view, TOG_VIEW_REF);
6734 		break;
6735 	case 'g':
6736 	case KEY_HOME:
6737 		s->selected = 0;
6738 		view->count = 0;
6739 		if (s->tree == s->root)
6740 			s->first_displayed_entry =
6741 			    got_object_tree_get_first_entry(s->tree);
6742 		else
6743 			s->first_displayed_entry = NULL;
6744 		break;
6745 	case 'G':
6746 	case KEY_END: {
6747 		int eos = view->nlines - 3;
6748 
6749 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6750 			--eos;  /* border */
6751 		s->selected = 0;
6752 		view->count = 0;
6753 		te = got_object_tree_get_last_entry(s->tree);
6754 		for (n = 0; n < eos; n++) {
6755 			if (te == NULL) {
6756 				if (s->tree != s->root) {
6757 					s->first_displayed_entry = NULL;
6758 					n++;
6759 				}
6760 				break;
6761 			}
6762 			s->first_displayed_entry = te;
6763 			te = got_tree_entry_get_prev(s->tree, te);
6764 		}
6765 		if (n > 0)
6766 			s->selected = n - 1;
6767 		break;
6768 	}
6769 	case 'k':
6770 	case KEY_UP:
6771 	case CTRL('p'):
6772 		if (s->selected > 0) {
6773 			s->selected--;
6774 			break;
6775 		}
6776 		tree_scroll_up(s, 1);
6777 		if (s->selected_entry == NULL ||
6778 		    (s->tree == s->root && s->selected_entry ==
6779 		     got_object_tree_get_first_entry(s->tree)))
6780 			view->count = 0;
6781 		break;
6782 	case CTRL('u'):
6783 	case 'u':
6784 		nscroll /= 2;
6785 		/* FALL THROUGH */
6786 	case KEY_PPAGE:
6787 	case CTRL('b'):
6788 	case 'b':
6789 		if (s->tree == s->root) {
6790 			if (got_object_tree_get_first_entry(s->tree) ==
6791 			    s->first_displayed_entry)
6792 				s->selected -= MIN(s->selected, nscroll);
6793 		} else {
6794 			if (s->first_displayed_entry == NULL)
6795 				s->selected -= MIN(s->selected, nscroll);
6796 		}
6797 		tree_scroll_up(s, MAX(0, nscroll));
6798 		if (s->selected_entry == NULL ||
6799 		    (s->tree == s->root && s->selected_entry ==
6800 		     got_object_tree_get_first_entry(s->tree)))
6801 			view->count = 0;
6802 		break;
6803 	case 'j':
6804 	case KEY_DOWN:
6805 	case CTRL('n'):
6806 		if (s->selected < s->ndisplayed - 1) {
6807 			s->selected++;
6808 			break;
6809 		}
6810 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6811 		    == NULL) {
6812 			/* can't scroll any further */
6813 			view->count = 0;
6814 			break;
6815 		}
6816 		tree_scroll_down(view, 1);
6817 		break;
6818 	case CTRL('d'):
6819 	case 'd':
6820 		nscroll /= 2;
6821 		/* FALL THROUGH */
6822 	case KEY_NPAGE:
6823 	case CTRL('f'):
6824 	case 'f':
6825 	case ' ':
6826 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6827 		    == NULL) {
6828 			/* can't scroll any further; move cursor down */
6829 			if (s->selected < s->ndisplayed - 1)
6830 				s->selected += MIN(nscroll,
6831 				    s->ndisplayed - s->selected - 1);
6832 			else
6833 				view->count = 0;
6834 			break;
6835 		}
6836 		tree_scroll_down(view, nscroll);
6837 		break;
6838 	case KEY_ENTER:
6839 	case '\r':
6840 	case KEY_BACKSPACE:
6841 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6842 			struct tog_parent_tree *parent;
6843 			/* user selected '..' */
6844 			if (s->tree == s->root) {
6845 				view->count = 0;
6846 				break;
6847 			}
6848 			parent = TAILQ_FIRST(&s->parents);
6849 			TAILQ_REMOVE(&s->parents, parent,
6850 			    entry);
6851 			got_object_tree_close(s->tree);
6852 			s->tree = parent->tree;
6853 			s->first_displayed_entry =
6854 			    parent->first_displayed_entry;
6855 			s->selected_entry =
6856 			    parent->selected_entry;
6857 			s->selected = parent->selected;
6858 			if (s->selected > view->nlines - 3) {
6859 				err = offset_selection_down(view);
6860 				if (err)
6861 					break;
6862 			}
6863 			free(parent);
6864 		} else if (S_ISDIR(got_tree_entry_get_mode(
6865 		    s->selected_entry))) {
6866 			struct got_tree_object *subtree;
6867 			view->count = 0;
6868 			err = got_object_open_as_tree(&subtree, s->repo,
6869 			    got_tree_entry_get_id(s->selected_entry));
6870 			if (err)
6871 				break;
6872 			err = tree_view_visit_subtree(s, subtree);
6873 			if (err) {
6874 				got_object_tree_close(subtree);
6875 				break;
6876 			}
6877 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
6878 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
6879 		break;
6880 	case KEY_RESIZE:
6881 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6882 			s->selected = view->nlines - 4;
6883 		view->count = 0;
6884 		break;
6885 	default:
6886 		view->count = 0;
6887 		break;
6888 	}
6889 
6890 	return err;
6891 }
6892 
6893 __dead static void
6894 usage_tree(void)
6895 {
6896 	endwin();
6897 	fprintf(stderr,
6898 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6899 	    getprogname());
6900 	exit(1);
6901 }
6902 
6903 static const struct got_error *
6904 cmd_tree(int argc, char *argv[])
6905 {
6906 	const struct got_error *error;
6907 	struct got_repository *repo = NULL;
6908 	struct got_worktree *worktree = NULL;
6909 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6910 	struct got_object_id *commit_id = NULL;
6911 	struct got_commit_object *commit = NULL;
6912 	const char *commit_id_arg = NULL;
6913 	char *label = NULL;
6914 	struct got_reference *ref = NULL;
6915 	const char *head_ref_name = NULL;
6916 	int ch;
6917 	struct tog_view *view;
6918 	int *pack_fds = NULL;
6919 
6920 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6921 		switch (ch) {
6922 		case 'c':
6923 			commit_id_arg = optarg;
6924 			break;
6925 		case 'r':
6926 			repo_path = realpath(optarg, NULL);
6927 			if (repo_path == NULL)
6928 				return got_error_from_errno2("realpath",
6929 				    optarg);
6930 			break;
6931 		default:
6932 			usage_tree();
6933 			/* NOTREACHED */
6934 		}
6935 	}
6936 
6937 	argc -= optind;
6938 	argv += optind;
6939 
6940 	if (argc > 1)
6941 		usage_tree();
6942 
6943 	error = got_repo_pack_fds_open(&pack_fds);
6944 	if (error != NULL)
6945 		goto done;
6946 
6947 	if (repo_path == NULL) {
6948 		cwd = getcwd(NULL, 0);
6949 		if (cwd == NULL)
6950 			return got_error_from_errno("getcwd");
6951 		error = got_worktree_open(&worktree, cwd);
6952 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6953 			goto done;
6954 		if (worktree)
6955 			repo_path =
6956 			    strdup(got_worktree_get_repo_path(worktree));
6957 		else
6958 			repo_path = strdup(cwd);
6959 		if (repo_path == NULL) {
6960 			error = got_error_from_errno("strdup");
6961 			goto done;
6962 		}
6963 	}
6964 
6965 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6966 	if (error != NULL)
6967 		goto done;
6968 
6969 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
6970 	    repo, worktree);
6971 	if (error)
6972 		goto done;
6973 
6974 	init_curses();
6975 
6976 	error = apply_unveil(got_repo_get_path(repo), NULL);
6977 	if (error)
6978 		goto done;
6979 
6980 	error = tog_load_refs(repo, 0);
6981 	if (error)
6982 		goto done;
6983 
6984 	if (commit_id_arg == NULL) {
6985 		error = got_repo_match_object_id(&commit_id, &label,
6986 		    worktree ? got_worktree_get_head_ref_name(worktree) :
6987 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6988 		if (error)
6989 			goto done;
6990 		head_ref_name = label;
6991 	} else {
6992 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
6993 		if (error == NULL)
6994 			head_ref_name = got_ref_get_name(ref);
6995 		else if (error->code != GOT_ERR_NOT_REF)
6996 			goto done;
6997 		error = got_repo_match_object_id(&commit_id, NULL,
6998 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6999 		if (error)
7000 			goto done;
7001 	}
7002 
7003 	error = got_object_open_as_commit(&commit, repo, commit_id);
7004 	if (error)
7005 		goto done;
7006 
7007 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7008 	if (view == NULL) {
7009 		error = got_error_from_errno("view_open");
7010 		goto done;
7011 	}
7012 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7013 	if (error)
7014 		goto done;
7015 	if (!got_path_is_root_dir(in_repo_path)) {
7016 		error = tree_view_walk_path(&view->state.tree, commit,
7017 		    in_repo_path);
7018 		if (error)
7019 			goto done;
7020 	}
7021 
7022 	if (worktree) {
7023 		/* Release work tree lock. */
7024 		got_worktree_close(worktree);
7025 		worktree = NULL;
7026 	}
7027 	error = view_loop(view);
7028 done:
7029 	free(repo_path);
7030 	free(cwd);
7031 	free(commit_id);
7032 	free(label);
7033 	if (ref)
7034 		got_ref_close(ref);
7035 	if (repo) {
7036 		const struct got_error *close_err = got_repo_close(repo);
7037 		if (error == NULL)
7038 			error = close_err;
7039 	}
7040 	if (pack_fds) {
7041 		const struct got_error *pack_err =
7042 		    got_repo_pack_fds_close(pack_fds);
7043 		if (error == NULL)
7044 			error = pack_err;
7045 	}
7046 	tog_free_refs();
7047 	return error;
7048 }
7049 
7050 static const struct got_error *
7051 ref_view_load_refs(struct tog_ref_view_state *s)
7052 {
7053 	struct got_reflist_entry *sre;
7054 	struct tog_reflist_entry *re;
7055 
7056 	s->nrefs = 0;
7057 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7058 		if (strncmp(got_ref_get_name(sre->ref),
7059 		    "refs/got/", 9) == 0 &&
7060 		    strncmp(got_ref_get_name(sre->ref),
7061 		    "refs/got/backup/", 16) != 0)
7062 			continue;
7063 
7064 		re = malloc(sizeof(*re));
7065 		if (re == NULL)
7066 			return got_error_from_errno("malloc");
7067 
7068 		re->ref = got_ref_dup(sre->ref);
7069 		if (re->ref == NULL)
7070 			return got_error_from_errno("got_ref_dup");
7071 		re->idx = s->nrefs++;
7072 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7073 	}
7074 
7075 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7076 	return NULL;
7077 }
7078 
7079 static void
7080 ref_view_free_refs(struct tog_ref_view_state *s)
7081 {
7082 	struct tog_reflist_entry *re;
7083 
7084 	while (!TAILQ_EMPTY(&s->refs)) {
7085 		re = TAILQ_FIRST(&s->refs);
7086 		TAILQ_REMOVE(&s->refs, re, entry);
7087 		got_ref_close(re->ref);
7088 		free(re);
7089 	}
7090 }
7091 
7092 static const struct got_error *
7093 open_ref_view(struct tog_view *view, struct got_repository *repo)
7094 {
7095 	const struct got_error *err = NULL;
7096 	struct tog_ref_view_state *s = &view->state.ref;
7097 
7098 	s->selected_entry = 0;
7099 	s->repo = repo;
7100 
7101 	TAILQ_INIT(&s->refs);
7102 	STAILQ_INIT(&s->colors);
7103 
7104 	err = ref_view_load_refs(s);
7105 	if (err)
7106 		return err;
7107 
7108 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7109 		err = add_color(&s->colors, "^refs/heads/",
7110 		    TOG_COLOR_REFS_HEADS,
7111 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7112 		if (err)
7113 			goto done;
7114 
7115 		err = add_color(&s->colors, "^refs/tags/",
7116 		    TOG_COLOR_REFS_TAGS,
7117 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7118 		if (err)
7119 			goto done;
7120 
7121 		err = add_color(&s->colors, "^refs/remotes/",
7122 		    TOG_COLOR_REFS_REMOTES,
7123 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7124 		if (err)
7125 			goto done;
7126 
7127 		err = add_color(&s->colors, "^refs/got/backup/",
7128 		    TOG_COLOR_REFS_BACKUP,
7129 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7130 		if (err)
7131 			goto done;
7132 	}
7133 
7134 	view->show = show_ref_view;
7135 	view->input = input_ref_view;
7136 	view->close = close_ref_view;
7137 	view->search_start = search_start_ref_view;
7138 	view->search_next = search_next_ref_view;
7139 done:
7140 	if (err)
7141 		free_colors(&s->colors);
7142 	return err;
7143 }
7144 
7145 static const struct got_error *
7146 close_ref_view(struct tog_view *view)
7147 {
7148 	struct tog_ref_view_state *s = &view->state.ref;
7149 
7150 	ref_view_free_refs(s);
7151 	free_colors(&s->colors);
7152 
7153 	return NULL;
7154 }
7155 
7156 static const struct got_error *
7157 resolve_reflist_entry(struct got_object_id **commit_id,
7158     struct tog_reflist_entry *re, struct got_repository *repo)
7159 {
7160 	const struct got_error *err = NULL;
7161 	struct got_object_id *obj_id;
7162 	struct got_tag_object *tag = NULL;
7163 	int obj_type;
7164 
7165 	*commit_id = NULL;
7166 
7167 	err = got_ref_resolve(&obj_id, repo, re->ref);
7168 	if (err)
7169 		return err;
7170 
7171 	err = got_object_get_type(&obj_type, repo, obj_id);
7172 	if (err)
7173 		goto done;
7174 
7175 	switch (obj_type) {
7176 	case GOT_OBJ_TYPE_COMMIT:
7177 		*commit_id = obj_id;
7178 		break;
7179 	case GOT_OBJ_TYPE_TAG:
7180 		err = got_object_open_as_tag(&tag, repo, obj_id);
7181 		if (err)
7182 			goto done;
7183 		free(obj_id);
7184 		err = got_object_get_type(&obj_type, repo,
7185 		    got_object_tag_get_object_id(tag));
7186 		if (err)
7187 			goto done;
7188 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7189 			err = got_error(GOT_ERR_OBJ_TYPE);
7190 			goto done;
7191 		}
7192 		*commit_id = got_object_id_dup(
7193 		    got_object_tag_get_object_id(tag));
7194 		if (*commit_id == NULL) {
7195 			err = got_error_from_errno("got_object_id_dup");
7196 			goto done;
7197 		}
7198 		break;
7199 	default:
7200 		err = got_error(GOT_ERR_OBJ_TYPE);
7201 		break;
7202 	}
7203 
7204 done:
7205 	if (tag)
7206 		got_object_tag_close(tag);
7207 	if (err) {
7208 		free(*commit_id);
7209 		*commit_id = NULL;
7210 	}
7211 	return err;
7212 }
7213 
7214 static const struct got_error *
7215 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7216     struct tog_reflist_entry *re, struct got_repository *repo)
7217 {
7218 	struct tog_view *log_view;
7219 	const struct got_error *err = NULL;
7220 	struct got_object_id *commit_id = NULL;
7221 
7222 	*new_view = NULL;
7223 
7224 	err = resolve_reflist_entry(&commit_id, re, repo);
7225 	if (err) {
7226 		if (err->code != GOT_ERR_OBJ_TYPE)
7227 			return err;
7228 		else
7229 			return NULL;
7230 	}
7231 
7232 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7233 	if (log_view == NULL) {
7234 		err = got_error_from_errno("view_open");
7235 		goto done;
7236 	}
7237 
7238 	err = open_log_view(log_view, commit_id, repo,
7239 	    got_ref_get_name(re->ref), "", 0);
7240 done:
7241 	if (err)
7242 		view_close(log_view);
7243 	else
7244 		*new_view = log_view;
7245 	free(commit_id);
7246 	return err;
7247 }
7248 
7249 static void
7250 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7251 {
7252 	struct tog_reflist_entry *re;
7253 	int i = 0;
7254 
7255 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7256 		return;
7257 
7258 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7259 	while (i++ < maxscroll) {
7260 		if (re == NULL)
7261 			break;
7262 		s->first_displayed_entry = re;
7263 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7264 	}
7265 }
7266 
7267 static const struct got_error *
7268 ref_scroll_down(struct tog_view *view, int maxscroll)
7269 {
7270 	struct tog_ref_view_state *s = &view->state.ref;
7271 	struct tog_reflist_entry *next, *last;
7272 	int n = 0;
7273 
7274 	if (s->first_displayed_entry)
7275 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7276 	else
7277 		next = TAILQ_FIRST(&s->refs);
7278 
7279 	last = s->last_displayed_entry;
7280 	while (next && n++ < maxscroll) {
7281 		if (last)
7282 			last = TAILQ_NEXT(last, entry);
7283 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7284 			s->first_displayed_entry = next;
7285 			next = TAILQ_NEXT(next, entry);
7286 		}
7287 	}
7288 
7289 	return NULL;
7290 }
7291 
7292 static const struct got_error *
7293 search_start_ref_view(struct tog_view *view)
7294 {
7295 	struct tog_ref_view_state *s = &view->state.ref;
7296 
7297 	s->matched_entry = NULL;
7298 	return NULL;
7299 }
7300 
7301 static int
7302 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7303 {
7304 	regmatch_t regmatch;
7305 
7306 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7307 	    0) == 0;
7308 }
7309 
7310 static const struct got_error *
7311 search_next_ref_view(struct tog_view *view)
7312 {
7313 	struct tog_ref_view_state *s = &view->state.ref;
7314 	struct tog_reflist_entry *re = NULL;
7315 
7316 	if (!view->searching) {
7317 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7318 		return NULL;
7319 	}
7320 
7321 	if (s->matched_entry) {
7322 		if (view->searching == TOG_SEARCH_FORWARD) {
7323 			if (s->selected_entry)
7324 				re = TAILQ_NEXT(s->selected_entry, entry);
7325 			else
7326 				re = TAILQ_PREV(s->selected_entry,
7327 				    tog_reflist_head, entry);
7328 		} else {
7329 			if (s->selected_entry == NULL)
7330 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7331 			else
7332 				re = TAILQ_PREV(s->selected_entry,
7333 				    tog_reflist_head, entry);
7334 		}
7335 	} else {
7336 		if (s->selected_entry)
7337 			re = s->selected_entry;
7338 		else if (view->searching == TOG_SEARCH_FORWARD)
7339 			re = TAILQ_FIRST(&s->refs);
7340 		else
7341 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7342 	}
7343 
7344 	while (1) {
7345 		if (re == NULL) {
7346 			if (s->matched_entry == NULL) {
7347 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7348 				return NULL;
7349 			}
7350 			if (view->searching == TOG_SEARCH_FORWARD)
7351 				re = TAILQ_FIRST(&s->refs);
7352 			else
7353 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7354 		}
7355 
7356 		if (match_reflist_entry(re, &view->regex)) {
7357 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7358 			s->matched_entry = re;
7359 			break;
7360 		}
7361 
7362 		if (view->searching == TOG_SEARCH_FORWARD)
7363 			re = TAILQ_NEXT(re, entry);
7364 		else
7365 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7366 	}
7367 
7368 	if (s->matched_entry) {
7369 		s->first_displayed_entry = s->matched_entry;
7370 		s->selected = 0;
7371 	}
7372 
7373 	return NULL;
7374 }
7375 
7376 static const struct got_error *
7377 show_ref_view(struct tog_view *view)
7378 {
7379 	const struct got_error *err = NULL;
7380 	struct tog_ref_view_state *s = &view->state.ref;
7381 	struct tog_reflist_entry *re;
7382 	char *line = NULL;
7383 	wchar_t *wline;
7384 	struct tog_color *tc;
7385 	int width, n;
7386 	int limit = view->nlines;
7387 
7388 	werase(view->window);
7389 
7390 	s->ndisplayed = 0;
7391 	if (view_is_hsplit_top(view))
7392 		--limit;  /* border */
7393 
7394 	if (limit == 0)
7395 		return NULL;
7396 
7397 	re = s->first_displayed_entry;
7398 
7399 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7400 	    s->nrefs) == -1)
7401 		return got_error_from_errno("asprintf");
7402 
7403 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7404 	if (err) {
7405 		free(line);
7406 		return err;
7407 	}
7408 	if (view_needs_focus_indication(view))
7409 		wstandout(view->window);
7410 	waddwstr(view->window, wline);
7411 	if (view_needs_focus_indication(view))
7412 		wstandend(view->window);
7413 	free(wline);
7414 	wline = NULL;
7415 	free(line);
7416 	line = NULL;
7417 	if (width < view->ncols - 1)
7418 		waddch(view->window, '\n');
7419 	if (--limit <= 0)
7420 		return NULL;
7421 
7422 	n = 0;
7423 	while (re && limit > 0) {
7424 		char *line = NULL;
7425 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7426 
7427 		if (s->show_date) {
7428 			struct got_commit_object *ci;
7429 			struct got_tag_object *tag;
7430 			struct got_object_id *id;
7431 			struct tm tm;
7432 			time_t t;
7433 
7434 			err = got_ref_resolve(&id, s->repo, re->ref);
7435 			if (err)
7436 				return err;
7437 			err = got_object_open_as_tag(&tag, s->repo, id);
7438 			if (err) {
7439 				if (err->code != GOT_ERR_OBJ_TYPE) {
7440 					free(id);
7441 					return err;
7442 				}
7443 				err = got_object_open_as_commit(&ci, s->repo,
7444 				    id);
7445 				if (err) {
7446 					free(id);
7447 					return err;
7448 				}
7449 				t = got_object_commit_get_committer_time(ci);
7450 				got_object_commit_close(ci);
7451 			} else {
7452 				t = got_object_tag_get_tagger_time(tag);
7453 				got_object_tag_close(tag);
7454 			}
7455 			free(id);
7456 			if (gmtime_r(&t, &tm) == NULL)
7457 				return got_error_from_errno("gmtime_r");
7458 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7459 				return got_error(GOT_ERR_NO_SPACE);
7460 		}
7461 		if (got_ref_is_symbolic(re->ref)) {
7462 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7463 			    ymd : "", got_ref_get_name(re->ref),
7464 			    got_ref_get_symref_target(re->ref)) == -1)
7465 				return got_error_from_errno("asprintf");
7466 		} else if (s->show_ids) {
7467 			struct got_object_id *id;
7468 			char *id_str;
7469 			err = got_ref_resolve(&id, s->repo, re->ref);
7470 			if (err)
7471 				return err;
7472 			err = got_object_id_str(&id_str, id);
7473 			if (err) {
7474 				free(id);
7475 				return err;
7476 			}
7477 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7478 			    got_ref_get_name(re->ref), id_str) == -1) {
7479 				err = got_error_from_errno("asprintf");
7480 				free(id);
7481 				free(id_str);
7482 				return err;
7483 			}
7484 			free(id);
7485 			free(id_str);
7486 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7487 		    got_ref_get_name(re->ref)) == -1)
7488 			return got_error_from_errno("asprintf");
7489 
7490 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7491 		    0, 0);
7492 		if (err) {
7493 			free(line);
7494 			return err;
7495 		}
7496 		if (n == s->selected) {
7497 			if (view->focussed)
7498 				wstandout(view->window);
7499 			s->selected_entry = re;
7500 		}
7501 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7502 		if (tc)
7503 			wattr_on(view->window,
7504 			    COLOR_PAIR(tc->colorpair), NULL);
7505 		waddwstr(view->window, wline);
7506 		if (tc)
7507 			wattr_off(view->window,
7508 			    COLOR_PAIR(tc->colorpair), NULL);
7509 		if (width < view->ncols - 1)
7510 			waddch(view->window, '\n');
7511 		if (n == s->selected && view->focussed)
7512 			wstandend(view->window);
7513 		free(line);
7514 		free(wline);
7515 		wline = NULL;
7516 		n++;
7517 		s->ndisplayed++;
7518 		s->last_displayed_entry = re;
7519 
7520 		limit--;
7521 		re = TAILQ_NEXT(re, entry);
7522 	}
7523 
7524 	view_border(view);
7525 	return err;
7526 }
7527 
7528 static const struct got_error *
7529 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7530     struct tog_reflist_entry *re, struct got_repository *repo)
7531 {
7532 	const struct got_error *err = NULL;
7533 	struct got_object_id *commit_id = NULL;
7534 	struct tog_view *tree_view;
7535 
7536 	*new_view = NULL;
7537 
7538 	err = resolve_reflist_entry(&commit_id, re, repo);
7539 	if (err) {
7540 		if (err->code != GOT_ERR_OBJ_TYPE)
7541 			return err;
7542 		else
7543 			return NULL;
7544 	}
7545 
7546 
7547 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7548 	if (tree_view == NULL) {
7549 		err = got_error_from_errno("view_open");
7550 		goto done;
7551 	}
7552 
7553 	err = open_tree_view(tree_view, commit_id,
7554 	    got_ref_get_name(re->ref), repo);
7555 	if (err)
7556 		goto done;
7557 
7558 	*new_view = tree_view;
7559 done:
7560 	free(commit_id);
7561 	return err;
7562 }
7563 static const struct got_error *
7564 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7565 {
7566 	const struct got_error *err = NULL;
7567 	struct tog_ref_view_state *s = &view->state.ref;
7568 	struct tog_reflist_entry *re;
7569 	int n, nscroll = view->nlines - 1;
7570 
7571 	switch (ch) {
7572 	case 'i':
7573 		s->show_ids = !s->show_ids;
7574 		view->count = 0;
7575 		break;
7576 	case 'm':
7577 		s->show_date = !s->show_date;
7578 		view->count = 0;
7579 		break;
7580 	case 'o':
7581 		s->sort_by_date = !s->sort_by_date;
7582 		view->count = 0;
7583 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7584 		    got_ref_cmp_by_commit_timestamp_descending :
7585 		    tog_ref_cmp_by_name, s->repo);
7586 		if (err)
7587 			break;
7588 		got_reflist_object_id_map_free(tog_refs_idmap);
7589 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7590 		    &tog_refs, s->repo);
7591 		if (err)
7592 			break;
7593 		ref_view_free_refs(s);
7594 		err = ref_view_load_refs(s);
7595 		break;
7596 	case KEY_ENTER:
7597 	case '\r':
7598 		view->count = 0;
7599 		if (!s->selected_entry)
7600 			break;
7601 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7602 		break;
7603 	case 'T':
7604 		view->count = 0;
7605 		if (!s->selected_entry)
7606 			break;
7607 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
7608 		break;
7609 	case 'g':
7610 	case KEY_HOME:
7611 		s->selected = 0;
7612 		view->count = 0;
7613 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7614 		break;
7615 	case 'G':
7616 	case KEY_END: {
7617 		int eos = view->nlines - 1;
7618 
7619 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7620 			--eos;  /* border */
7621 		s->selected = 0;
7622 		view->count = 0;
7623 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7624 		for (n = 0; n < eos; n++) {
7625 			if (re == NULL)
7626 				break;
7627 			s->first_displayed_entry = re;
7628 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7629 		}
7630 		if (n > 0)
7631 			s->selected = n - 1;
7632 		break;
7633 	}
7634 	case 'k':
7635 	case KEY_UP:
7636 	case CTRL('p'):
7637 		if (s->selected > 0) {
7638 			s->selected--;
7639 			break;
7640 		}
7641 		ref_scroll_up(s, 1);
7642 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7643 			view->count = 0;
7644 		break;
7645 	case CTRL('u'):
7646 	case 'u':
7647 		nscroll /= 2;
7648 		/* FALL THROUGH */
7649 	case KEY_PPAGE:
7650 	case CTRL('b'):
7651 	case 'b':
7652 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7653 			s->selected -= MIN(nscroll, s->selected);
7654 		ref_scroll_up(s, MAX(0, nscroll));
7655 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7656 			view->count = 0;
7657 		break;
7658 	case 'j':
7659 	case KEY_DOWN:
7660 	case CTRL('n'):
7661 		if (s->selected < s->ndisplayed - 1) {
7662 			s->selected++;
7663 			break;
7664 		}
7665 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7666 			/* can't scroll any further */
7667 			view->count = 0;
7668 			break;
7669 		}
7670 		ref_scroll_down(view, 1);
7671 		break;
7672 	case CTRL('d'):
7673 	case 'd':
7674 		nscroll /= 2;
7675 		/* FALL THROUGH */
7676 	case KEY_NPAGE:
7677 	case CTRL('f'):
7678 	case 'f':
7679 	case ' ':
7680 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7681 			/* can't scroll any further; move cursor down */
7682 			if (s->selected < s->ndisplayed - 1)
7683 				s->selected += MIN(nscroll,
7684 				    s->ndisplayed - s->selected - 1);
7685 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7686 				s->selected += s->ndisplayed - s->selected - 1;
7687 			view->count = 0;
7688 			break;
7689 		}
7690 		ref_scroll_down(view, nscroll);
7691 		break;
7692 	case CTRL('l'):
7693 		view->count = 0;
7694 		tog_free_refs();
7695 		err = tog_load_refs(s->repo, s->sort_by_date);
7696 		if (err)
7697 			break;
7698 		ref_view_free_refs(s);
7699 		err = ref_view_load_refs(s);
7700 		break;
7701 	case KEY_RESIZE:
7702 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7703 			s->selected = view->nlines - 2;
7704 		break;
7705 	default:
7706 		view->count = 0;
7707 		break;
7708 	}
7709 
7710 	return err;
7711 }
7712 
7713 __dead static void
7714 usage_ref(void)
7715 {
7716 	endwin();
7717 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7718 	    getprogname());
7719 	exit(1);
7720 }
7721 
7722 static const struct got_error *
7723 cmd_ref(int argc, char *argv[])
7724 {
7725 	const struct got_error *error;
7726 	struct got_repository *repo = NULL;
7727 	struct got_worktree *worktree = NULL;
7728 	char *cwd = NULL, *repo_path = NULL;
7729 	int ch;
7730 	struct tog_view *view;
7731 	int *pack_fds = NULL;
7732 
7733 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7734 		switch (ch) {
7735 		case 'r':
7736 			repo_path = realpath(optarg, NULL);
7737 			if (repo_path == NULL)
7738 				return got_error_from_errno2("realpath",
7739 				    optarg);
7740 			break;
7741 		default:
7742 			usage_ref();
7743 			/* NOTREACHED */
7744 		}
7745 	}
7746 
7747 	argc -= optind;
7748 	argv += optind;
7749 
7750 	if (argc > 1)
7751 		usage_ref();
7752 
7753 	error = got_repo_pack_fds_open(&pack_fds);
7754 	if (error != NULL)
7755 		goto done;
7756 
7757 	if (repo_path == NULL) {
7758 		cwd = getcwd(NULL, 0);
7759 		if (cwd == NULL)
7760 			return got_error_from_errno("getcwd");
7761 		error = got_worktree_open(&worktree, cwd);
7762 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7763 			goto done;
7764 		if (worktree)
7765 			repo_path =
7766 			    strdup(got_worktree_get_repo_path(worktree));
7767 		else
7768 			repo_path = strdup(cwd);
7769 		if (repo_path == NULL) {
7770 			error = got_error_from_errno("strdup");
7771 			goto done;
7772 		}
7773 	}
7774 
7775 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7776 	if (error != NULL)
7777 		goto done;
7778 
7779 	init_curses();
7780 
7781 	error = apply_unveil(got_repo_get_path(repo), NULL);
7782 	if (error)
7783 		goto done;
7784 
7785 	error = tog_load_refs(repo, 0);
7786 	if (error)
7787 		goto done;
7788 
7789 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7790 	if (view == NULL) {
7791 		error = got_error_from_errno("view_open");
7792 		goto done;
7793 	}
7794 
7795 	error = open_ref_view(view, repo);
7796 	if (error)
7797 		goto done;
7798 
7799 	if (worktree) {
7800 		/* Release work tree lock. */
7801 		got_worktree_close(worktree);
7802 		worktree = NULL;
7803 	}
7804 	error = view_loop(view);
7805 done:
7806 	free(repo_path);
7807 	free(cwd);
7808 	if (repo) {
7809 		const struct got_error *close_err = got_repo_close(repo);
7810 		if (close_err)
7811 			error = close_err;
7812 	}
7813 	if (pack_fds) {
7814 		const struct got_error *pack_err =
7815 		    got_repo_pack_fds_close(pack_fds);
7816 		if (error == NULL)
7817 			error = pack_err;
7818 	}
7819 	tog_free_refs();
7820 	return error;
7821 }
7822 
7823 static const struct got_error *
7824 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
7825     enum tog_view_type request, int y, int x)
7826 {
7827 	const struct got_error *err = NULL;
7828 
7829 	*new_view = NULL;
7830 
7831 	switch (request) {
7832 	case TOG_VIEW_DIFF:
7833 		if (view->type == TOG_VIEW_LOG) {
7834 			struct tog_log_view_state *s = &view->state.log;
7835 
7836 			err = open_diff_view_for_commit(new_view, y, x,
7837 			    s->selected_entry->commit, s->selected_entry->id,
7838 			    view, s->repo);
7839 		} else
7840 			return got_error_msg(GOT_ERR_NOT_IMPL,
7841 			    "parent/child view pair not supported");
7842 		break;
7843 	case TOG_VIEW_BLAME:
7844 		if (view->type == TOG_VIEW_TREE) {
7845 			struct tog_tree_view_state *s = &view->state.tree;
7846 
7847 			err = blame_tree_entry(new_view, y, x,
7848 			    s->selected_entry, &s->parents, s->commit_id,
7849 			    s->repo);
7850 		} else
7851 			return got_error_msg(GOT_ERR_NOT_IMPL,
7852 			    "parent/child view pair not supported");
7853 		break;
7854 	case TOG_VIEW_LOG:
7855 		if (view->type == TOG_VIEW_BLAME)
7856 			err = log_annotated_line(new_view, y, x,
7857 			    view->state.blame.repo, view->state.blame.id_to_log);
7858 		else if (view->type == TOG_VIEW_TREE)
7859 			err = log_selected_tree_entry(new_view, y, x,
7860 			    &view->state.tree);
7861 		else if (view->type == TOG_VIEW_REF)
7862 			err = log_ref_entry(new_view, y, x,
7863 			    view->state.ref.selected_entry,
7864 			    view->state.ref.repo);
7865 		else
7866 			return got_error_msg(GOT_ERR_NOT_IMPL,
7867 			    "parent/child view pair not supported");
7868 		break;
7869 	case TOG_VIEW_TREE:
7870 		if (view->type == TOG_VIEW_LOG)
7871 			err = browse_commit_tree(new_view, y, x,
7872 			    view->state.log.selected_entry,
7873 			    view->state.log.in_repo_path,
7874 			    view->state.log.head_ref_name,
7875 			    view->state.log.repo);
7876 		else if (view->type == TOG_VIEW_REF)
7877 			err = browse_ref_tree(new_view, y, x,
7878 			    view->state.ref.selected_entry,
7879 			    view->state.ref.repo);
7880 		else
7881 			return got_error_msg(GOT_ERR_NOT_IMPL,
7882 			    "parent/child view pair not supported");
7883 		break;
7884 	case TOG_VIEW_REF:
7885 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
7886 		if (*new_view == NULL)
7887 			return got_error_from_errno("view_open");
7888 		if (view->type == TOG_VIEW_LOG)
7889 			err = open_ref_view(*new_view, view->state.log.repo);
7890 		else if (view->type == TOG_VIEW_TREE)
7891 			err = open_ref_view(*new_view, view->state.tree.repo);
7892 		else
7893 			err = got_error_msg(GOT_ERR_NOT_IMPL,
7894 			    "parent/child view pair not supported");
7895 		if (err)
7896 			view_close(*new_view);
7897 		break;
7898 	default:
7899 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
7900 	}
7901 
7902 	return err;
7903 }
7904 
7905 /*
7906  * If view was scrolled down to move the selected line into view when opening a
7907  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7908  */
7909 static void
7910 offset_selection_up(struct tog_view *view)
7911 {
7912 	switch (view->type) {
7913 	case TOG_VIEW_BLAME: {
7914 		struct tog_blame_view_state *s = &view->state.blame;
7915 		if (s->first_displayed_line == 1) {
7916 			s->selected_line = MAX(s->selected_line - view->offset,
7917 			    1);
7918 			break;
7919 		}
7920 		if (s->first_displayed_line > view->offset)
7921 			s->first_displayed_line -= view->offset;
7922 		else
7923 			s->first_displayed_line = 1;
7924 		s->selected_line += view->offset;
7925 		break;
7926 	}
7927 	case TOG_VIEW_LOG:
7928 		log_scroll_up(&view->state.log, view->offset);
7929 		view->state.log.selected += view->offset;
7930 		break;
7931 	case TOG_VIEW_REF:
7932 		ref_scroll_up(&view->state.ref, view->offset);
7933 		view->state.ref.selected += view->offset;
7934 		break;
7935 	case TOG_VIEW_TREE:
7936 		tree_scroll_up(&view->state.tree, view->offset);
7937 		view->state.tree.selected += view->offset;
7938 		break;
7939 	default:
7940 		break;
7941 	}
7942 
7943 	view->offset = 0;
7944 }
7945 
7946 /*
7947  * If the selected line is in the section of screen covered by the bottom split,
7948  * scroll down offset lines to move it into view and index its new position.
7949  */
7950 static const struct got_error *
7951 offset_selection_down(struct tog_view *view)
7952 {
7953 	const struct got_error	*err = NULL;
7954 	const struct got_error	*(*scrolld)(struct tog_view *, int);
7955 	int			*selected = NULL;
7956 	int			 header, offset;
7957 
7958 	switch (view->type) {
7959 	case TOG_VIEW_BLAME: {
7960 		struct tog_blame_view_state *s = &view->state.blame;
7961 		header = 3;
7962 		scrolld = NULL;
7963 		if (s->selected_line > view->nlines - header) {
7964 			offset = abs(view->nlines - s->selected_line - header);
7965 			s->first_displayed_line += offset;
7966 			s->selected_line -= offset;
7967 			view->offset = offset;
7968 		}
7969 		break;
7970 	}
7971 	case TOG_VIEW_LOG: {
7972 		struct tog_log_view_state *s = &view->state.log;
7973 		scrolld = &log_scroll_down;
7974 		header = view_is_parent_view(view) ? 3 : 2;
7975 		selected = &s->selected;
7976 		break;
7977 	}
7978 	case TOG_VIEW_REF: {
7979 		struct tog_ref_view_state *s = &view->state.ref;
7980 		scrolld = &ref_scroll_down;
7981 		header = 3;
7982 		selected = &s->selected;
7983 		break;
7984 	}
7985 	case TOG_VIEW_TREE: {
7986 		struct tog_tree_view_state *s = &view->state.tree;
7987 		scrolld = &tree_scroll_down;
7988 		header = 5;
7989 		selected = &s->selected;
7990 		break;
7991 	}
7992 	default:
7993 		selected = NULL;
7994 		scrolld = NULL;
7995 		header = 0;
7996 		break;
7997 	}
7998 
7999 	if (selected && *selected > view->nlines - header) {
8000 		offset = abs(view->nlines - *selected - header);
8001 		view->offset = offset;
8002 		if (scrolld && offset) {
8003 			err = scrolld(view, offset);
8004 			*selected -= offset;
8005 		}
8006 	}
8007 
8008 	return err;
8009 }
8010 
8011 static void
8012 list_commands(FILE *fp)
8013 {
8014 	size_t i;
8015 
8016 	fprintf(fp, "commands:");
8017 	for (i = 0; i < nitems(tog_commands); i++) {
8018 		const struct tog_cmd *cmd = &tog_commands[i];
8019 		fprintf(fp, " %s", cmd->name);
8020 	}
8021 	fputc('\n', fp);
8022 }
8023 
8024 __dead static void
8025 usage(int hflag, int status)
8026 {
8027 	FILE *fp = (status == 0) ? stdout : stderr;
8028 
8029 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8030 	    getprogname());
8031 	if (hflag) {
8032 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8033 		list_commands(fp);
8034 	}
8035 	exit(status);
8036 }
8037 
8038 static char **
8039 make_argv(int argc, ...)
8040 {
8041 	va_list ap;
8042 	char **argv;
8043 	int i;
8044 
8045 	va_start(ap, argc);
8046 
8047 	argv = calloc(argc, sizeof(char *));
8048 	if (argv == NULL)
8049 		err(1, "calloc");
8050 	for (i = 0; i < argc; i++) {
8051 		argv[i] = strdup(va_arg(ap, char *));
8052 		if (argv[i] == NULL)
8053 			err(1, "strdup");
8054 	}
8055 
8056 	va_end(ap);
8057 	return argv;
8058 }
8059 
8060 /*
8061  * Try to convert 'tog path' into a 'tog log path' command.
8062  * The user could simply have mistyped the command rather than knowingly
8063  * provided a path. So check whether argv[0] can in fact be resolved
8064  * to a path in the HEAD commit and print a special error if not.
8065  * This hack is for mpi@ <3
8066  */
8067 static const struct got_error *
8068 tog_log_with_path(int argc, char *argv[])
8069 {
8070 	const struct got_error *error = NULL, *close_err;
8071 	const struct tog_cmd *cmd = NULL;
8072 	struct got_repository *repo = NULL;
8073 	struct got_worktree *worktree = NULL;
8074 	struct got_object_id *commit_id = NULL, *id = NULL;
8075 	struct got_commit_object *commit = NULL;
8076 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8077 	char *commit_id_str = NULL, **cmd_argv = NULL;
8078 	int *pack_fds = NULL;
8079 
8080 	cwd = getcwd(NULL, 0);
8081 	if (cwd == NULL)
8082 		return got_error_from_errno("getcwd");
8083 
8084 	error = got_repo_pack_fds_open(&pack_fds);
8085 	if (error != NULL)
8086 		goto done;
8087 
8088 	error = got_worktree_open(&worktree, cwd);
8089 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8090 		goto done;
8091 
8092 	if (worktree)
8093 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8094 	else
8095 		repo_path = strdup(cwd);
8096 	if (repo_path == NULL) {
8097 		error = got_error_from_errno("strdup");
8098 		goto done;
8099 	}
8100 
8101 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8102 	if (error != NULL)
8103 		goto done;
8104 
8105 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8106 	    repo, worktree);
8107 	if (error)
8108 		goto done;
8109 
8110 	error = tog_load_refs(repo, 0);
8111 	if (error)
8112 		goto done;
8113 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8114 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8115 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8116 	if (error)
8117 		goto done;
8118 
8119 	if (worktree) {
8120 		got_worktree_close(worktree);
8121 		worktree = NULL;
8122 	}
8123 
8124 	error = got_object_open_as_commit(&commit, repo, commit_id);
8125 	if (error)
8126 		goto done;
8127 
8128 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8129 	if (error) {
8130 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8131 			goto done;
8132 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8133 		    getprogname(), argv[0]);
8134 		usage(1, 1);
8135 		/* not reached */
8136 	}
8137 
8138 	error = got_object_id_str(&commit_id_str, commit_id);
8139 	if (error)
8140 		goto done;
8141 
8142 	cmd = &tog_commands[0]; /* log */
8143 	argc = 4;
8144 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8145 	error = cmd->cmd_main(argc, cmd_argv);
8146 done:
8147 	if (repo) {
8148 		close_err = got_repo_close(repo);
8149 		if (error == NULL)
8150 			error = close_err;
8151 	}
8152 	if (commit)
8153 		got_object_commit_close(commit);
8154 	if (worktree)
8155 		got_worktree_close(worktree);
8156 	if (pack_fds) {
8157 		const struct got_error *pack_err =
8158 		    got_repo_pack_fds_close(pack_fds);
8159 		if (error == NULL)
8160 			error = pack_err;
8161 	}
8162 	free(id);
8163 	free(commit_id_str);
8164 	free(commit_id);
8165 	free(cwd);
8166 	free(repo_path);
8167 	free(in_repo_path);
8168 	if (cmd_argv) {
8169 		int i;
8170 		for (i = 0; i < argc; i++)
8171 			free(cmd_argv[i]);
8172 		free(cmd_argv);
8173 	}
8174 	tog_free_refs();
8175 	return error;
8176 }
8177 
8178 int
8179 main(int argc, char *argv[])
8180 {
8181 	const struct got_error *error = NULL;
8182 	const struct tog_cmd *cmd = NULL;
8183 	int ch, hflag = 0, Vflag = 0;
8184 	char **cmd_argv = NULL;
8185 	static const struct option longopts[] = {
8186 	    { "version", no_argument, NULL, 'V' },
8187 	    { NULL, 0, NULL, 0}
8188 	};
8189 	char *diff_algo_str = NULL;
8190 
8191 	setlocale(LC_CTYPE, "");
8192 
8193 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8194 		switch (ch) {
8195 		case 'h':
8196 			hflag = 1;
8197 			break;
8198 		case 'V':
8199 			Vflag = 1;
8200 			break;
8201 		default:
8202 			usage(hflag, 1);
8203 			/* NOTREACHED */
8204 		}
8205 	}
8206 
8207 	argc -= optind;
8208 	argv += optind;
8209 	optind = 1;
8210 	optreset = 1;
8211 
8212 	if (Vflag) {
8213 		got_version_print_str();
8214 		return 0;
8215 	}
8216 
8217 #ifndef PROFILE
8218 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8219 	    NULL) == -1)
8220 		err(1, "pledge");
8221 #endif
8222 
8223 	if (argc == 0) {
8224 		if (hflag)
8225 			usage(hflag, 0);
8226 		/* Build an argument vector which runs a default command. */
8227 		cmd = &tog_commands[0];
8228 		argc = 1;
8229 		cmd_argv = make_argv(argc, cmd->name);
8230 	} else {
8231 		size_t i;
8232 
8233 		/* Did the user specify a command? */
8234 		for (i = 0; i < nitems(tog_commands); i++) {
8235 			if (strncmp(tog_commands[i].name, argv[0],
8236 			    strlen(argv[0])) == 0) {
8237 				cmd = &tog_commands[i];
8238 				break;
8239 			}
8240 		}
8241 	}
8242 
8243 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8244 	if (diff_algo_str) {
8245 		if (strcasecmp(diff_algo_str, "patience") == 0)
8246 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8247 		if (strcasecmp(diff_algo_str, "myers") == 0)
8248 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8249 	}
8250 
8251 	if (cmd == NULL) {
8252 		if (argc != 1)
8253 			usage(0, 1);
8254 		/* No command specified; try log with a path */
8255 		error = tog_log_with_path(argc, argv);
8256 	} else {
8257 		if (hflag)
8258 			cmd->cmd_usage();
8259 		else
8260 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8261 	}
8262 
8263 	endwin();
8264 	putchar('\n');
8265 	if (cmd_argv) {
8266 		int i;
8267 		for (i = 0; i < argc; i++)
8268 			free(cmd_argv[i]);
8269 		free(cmd_argv);
8270 	}
8271 
8272 	if (error && error->code != GOT_ERR_CANCELLED)
8273 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8274 	return 0;
8275 }