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/stat.h>
18 #include <sys/ioctl.h>
19 
20 #include <ctype.h>
21 #include <errno.h>
22 #if defined(__FreeBSD__) || defined(__APPLE__)
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #endif
25 #include <curses.h>
26 #include <panel.h>
27 #include <locale.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_compat.h"
45 
46 #include "got_version.h"
47 #include "got_error.h"
48 #include "got_object.h"
49 #include "got_reference.h"
50 #include "got_repository.h"
51 #include "got_diff.h"
52 #include "got_opentemp.h"
53 #include "got_utf8.h"
54 #include "got_cancel.h"
55 #include "got_commit_graph.h"
56 #include "got_blame.h"
57 #include "got_privsep.h"
58 #include "got_path.h"
59 #include "got_worktree.h"
60 
61 //#define update_panels() (0)
62 //#define doupdate() (0)
63 
64 #ifndef MIN
65 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
66 #endif
67 
68 #ifndef MAX
69 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
70 #endif
71 
72 #ifndef CTRL
73 #define CTRL(x)		((x) & 0x1f)
74 #endif
75 
76 #ifndef nitems
77 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
78 #endif
79 
80 struct tog_cmd {
81 	const char *name;
82 	const struct got_error *(*cmd_main)(int, char *[]);
83 	void (*cmd_usage)(void);
84 };
85 
86 __dead static void	usage(int, int);
87 __dead static void	usage_log(void);
88 __dead static void	usage_diff(void);
89 __dead static void	usage_blame(void);
90 __dead static void	usage_tree(void);
91 __dead static void	usage_ref(void);
92 
93 static const struct got_error*	cmd_log(int, char *[]);
94 static const struct got_error*	cmd_diff(int, char *[]);
95 static const struct got_error*	cmd_blame(int, char *[]);
96 static const struct got_error*	cmd_tree(int, char *[]);
97 static const struct got_error*	cmd_ref(int, char *[]);
98 
99 static const struct tog_cmd tog_commands[] = {
100 	{ "log",	cmd_log,	usage_log },
101 	{ "diff",	cmd_diff,	usage_diff },
102 	{ "blame",	cmd_blame,	usage_blame },
103 	{ "tree",	cmd_tree,	usage_tree },
104 	{ "ref",	cmd_ref,	usage_ref },
105 };
106 
107 enum tog_view_type {
108 	TOG_VIEW_DIFF,
109 	TOG_VIEW_LOG,
110 	TOG_VIEW_BLAME,
111 	TOG_VIEW_TREE,
112 	TOG_VIEW_REF,
113 };
114 
115 #define TOG_EOF_STRING	"(END)"
116 
117 struct commit_queue_entry {
118 	TAILQ_ENTRY(commit_queue_entry) entry;
119 	struct got_object_id *id;
120 	struct got_commit_object *commit;
121 	int idx;
122 };
123 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
124 struct commit_queue {
125 	int ncommits;
126 	struct commit_queue_head head;
127 };
128 
129 struct tog_color {
130 	STAILQ_ENTRY(tog_color) entry;
131 	regex_t regex;
132 	short colorpair;
133 };
134 STAILQ_HEAD(tog_colors, tog_color);
135 
136 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
137 static struct got_reflist_object_id_map *tog_refs_idmap;
138 
139 static const struct got_error *
140 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
141     struct got_reference* re2)
142 {
143 	const char *name1 = got_ref_get_name(re1);
144 	const char *name2 = got_ref_get_name(re2);
145 	int isbackup1, isbackup2;
146 
147 	/* Sort backup refs towards the bottom of the list. */
148 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
149 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
150 	if (!isbackup1 && isbackup2) {
151 		*cmp = -1;
152 		return NULL;
153 	} else if (isbackup1 && !isbackup2) {
154 		*cmp = 1;
155 		return NULL;
156 	}
157 
158 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
159 	return NULL;
160 }
161 
162 static const struct got_error *
163 tog_load_refs(struct got_repository *repo, int sort_by_date)
164 {
165 	const struct got_error *err;
166 
167 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
168 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
169 	    repo);
170 	if (err)
171 		return err;
172 
173 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
174 	    repo);
175 }
176 
177 static void
178 tog_free_refs(void)
179 {
180 	if (tog_refs_idmap) {
181 		got_reflist_object_id_map_free(tog_refs_idmap);
182 		tog_refs_idmap = NULL;
183 	}
184 	got_ref_list_free(&tog_refs);
185 }
186 
187 static const struct got_error *
188 add_color(struct tog_colors *colors, const char *pattern,
189     int idx, short color)
190 {
191 	const struct got_error *err = NULL;
192 	struct tog_color *tc;
193 	int regerr = 0;
194 
195 	if (idx < 1 || idx > COLOR_PAIRS - 1)
196 		return NULL;
197 
198 	init_pair(idx, color, -1);
199 
200 	tc = calloc(1, sizeof(*tc));
201 	if (tc == NULL)
202 		return got_error_from_errno("calloc");
203 	regerr = regcomp(&tc->regex, pattern,
204 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
205 	if (regerr) {
206 		static char regerr_msg[512];
207 		static char err_msg[512];
208 		regerror(regerr, &tc->regex, regerr_msg,
209 		    sizeof(regerr_msg));
210 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
211 		    regerr_msg);
212 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
213 		free(tc);
214 		return err;
215 	}
216 	tc->colorpair = idx;
217 	STAILQ_INSERT_HEAD(colors, tc, entry);
218 	return NULL;
219 }
220 
221 static void
222 free_colors(struct tog_colors *colors)
223 {
224 	struct tog_color *tc;
225 
226 	while (!STAILQ_EMPTY(colors)) {
227 		tc = STAILQ_FIRST(colors);
228 		STAILQ_REMOVE_HEAD(colors, entry);
229 		regfree(&tc->regex);
230 		free(tc);
231 	}
232 }
233 
234 struct tog_color *
235 get_color(struct tog_colors *colors, int colorpair)
236 {
237 	struct tog_color *tc = NULL;
238 
239 	STAILQ_FOREACH(tc, colors, entry) {
240 		if (tc->colorpair == colorpair)
241 			return tc;
242 	}
243 
244 	return NULL;
245 }
246 
247 static int
248 default_color_value(const char *envvar)
249 {
250 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
251 		return COLOR_MAGENTA;
252 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
253 		return COLOR_CYAN;
254 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
255 		return COLOR_YELLOW;
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
257 		return COLOR_GREEN;
258 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
259 		return COLOR_MAGENTA;
260 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
261 		return COLOR_MAGENTA;
262 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
263 		return COLOR_CYAN;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
265 		return COLOR_GREEN;
266 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
267 		return COLOR_GREEN;
268 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
271 		return COLOR_YELLOW;
272 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
275 		return COLOR_MAGENTA;
276 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
279 		return COLOR_CYAN;
280 
281 	return -1;
282 }
283 
284 static int
285 get_color_value(const char *envvar)
286 {
287 	const char *val = getenv(envvar);
288 
289 	if (val == NULL)
290 		return default_color_value(envvar);
291 
292 	if (strcasecmp(val, "black") == 0)
293 		return COLOR_BLACK;
294 	if (strcasecmp(val, "red") == 0)
295 		return COLOR_RED;
296 	if (strcasecmp(val, "green") == 0)
297 		return COLOR_GREEN;
298 	if (strcasecmp(val, "yellow") == 0)
299 		return COLOR_YELLOW;
300 	if (strcasecmp(val, "blue") == 0)
301 		return COLOR_BLUE;
302 	if (strcasecmp(val, "magenta") == 0)
303 		return COLOR_MAGENTA;
304 	if (strcasecmp(val, "cyan") == 0)
305 		return COLOR_CYAN;
306 	if (strcasecmp(val, "white") == 0)
307 		return COLOR_WHITE;
308 	if (strcasecmp(val, "default") == 0)
309 		return -1;
310 
311 	return default_color_value(envvar);
312 }
313 
314 
315 struct tog_diff_view_state {
316 	struct got_object_id *id1, *id2;
317 	const char *label1, *label2;
318 	FILE *f, *f1, *f2;
319 	int first_displayed_line;
320 	int last_displayed_line;
321 	int eof;
322 	int diff_context;
323 	int ignore_whitespace;
324 	int force_text_diff;
325 	struct got_repository *repo;
326 	struct tog_colors colors;
327 	size_t nlines;
328 	off_t *line_offsets;
329 	int matched_line;
330 	int selected_line;
331 
332 	/* passed from log view; may be NULL */
333 	struct tog_view *log_view;
334 };
335 
336 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
337 
338 struct tog_log_thread_args {
339 	pthread_cond_t need_commits;
340 	pthread_cond_t commit_loaded;
341 	int commits_needed;
342 	int load_all;
343 	struct got_commit_graph *graph;
344 	struct commit_queue *commits;
345 	const char *in_repo_path;
346 	struct got_object_id *start_id;
347 	struct got_repository *repo;
348 	int *pack_fds;
349 	int log_complete;
350 	sig_atomic_t *quit;
351 	struct commit_queue_entry **first_displayed_entry;
352 	struct commit_queue_entry **selected_entry;
353 	int *searching;
354 	int *search_next_done;
355 	regex_t *regex;
356 };
357 
358 struct tog_log_view_state {
359 	struct commit_queue commits;
360 	struct commit_queue_entry *first_displayed_entry;
361 	struct commit_queue_entry *last_displayed_entry;
362 	struct commit_queue_entry *selected_entry;
363 	int selected;
364 	char *in_repo_path;
365 	char *head_ref_name;
366 	int log_branches;
367 	struct got_repository *repo;
368 	struct got_object_id *start_id;
369 	sig_atomic_t quit;
370 	pthread_t thread;
371 	struct tog_log_thread_args thread_args;
372 	struct commit_queue_entry *matched_entry;
373 	struct commit_queue_entry *search_entry;
374 	struct tog_colors colors;
375 };
376 
377 #define TOG_COLOR_DIFF_MINUS		1
378 #define TOG_COLOR_DIFF_PLUS		2
379 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
380 #define TOG_COLOR_DIFF_META		4
381 #define TOG_COLOR_TREE_SUBMODULE	5
382 #define TOG_COLOR_TREE_SYMLINK		6
383 #define TOG_COLOR_TREE_DIRECTORY	7
384 #define TOG_COLOR_TREE_EXECUTABLE	8
385 #define TOG_COLOR_COMMIT		9
386 #define TOG_COLOR_AUTHOR		10
387 #define TOG_COLOR_DATE			11
388 #define TOG_COLOR_REFS_HEADS		12
389 #define TOG_COLOR_REFS_TAGS		13
390 #define TOG_COLOR_REFS_REMOTES		14
391 #define TOG_COLOR_REFS_BACKUP		15
392 
393 struct tog_blame_cb_args {
394 	struct tog_blame_line *lines; /* one per line */
395 	int nlines;
396 
397 	struct tog_view *view;
398 	struct got_object_id *commit_id;
399 	int *quit;
400 };
401 
402 struct tog_blame_thread_args {
403 	const char *path;
404 	struct got_repository *repo;
405 	struct tog_blame_cb_args *cb_args;
406 	int *complete;
407 	got_cancel_cb cancel_cb;
408 	void *cancel_arg;
409 };
410 
411 struct tog_blame {
412 	FILE *f;
413 	off_t filesize;
414 	struct tog_blame_line *lines;
415 	int nlines;
416 	off_t *line_offsets;
417 	pthread_t thread;
418 	struct tog_blame_thread_args thread_args;
419 	struct tog_blame_cb_args cb_args;
420 	const char *path;
421 	int *pack_fds;
422 };
423 
424 struct tog_blame_view_state {
425 	int first_displayed_line;
426 	int last_displayed_line;
427 	int selected_line;
428 	int blame_complete;
429 	int eof;
430 	int done;
431 	struct got_object_id_queue blamed_commits;
432 	struct got_object_qid *blamed_commit;
433 	char *path;
434 	struct got_repository *repo;
435 	struct got_object_id *commit_id;
436 	struct tog_blame blame;
437 	int matched_line;
438 	struct tog_colors colors;
439 };
440 
441 struct tog_parent_tree {
442 	TAILQ_ENTRY(tog_parent_tree) entry;
443 	struct got_tree_object *tree;
444 	struct got_tree_entry *first_displayed_entry;
445 	struct got_tree_entry *selected_entry;
446 	int selected;
447 };
448 
449 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
450 
451 struct tog_tree_view_state {
452 	char *tree_label;
453 	struct got_object_id *commit_id;/* commit which this tree belongs to */
454 	struct got_tree_object *root;	/* the commit's root tree entry */
455 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
456 	struct got_tree_entry *first_displayed_entry;
457 	struct got_tree_entry *last_displayed_entry;
458 	struct got_tree_entry *selected_entry;
459 	int ndisplayed, selected, show_ids;
460 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
461 	char *head_ref_name;
462 	struct got_repository *repo;
463 	struct got_tree_entry *matched_entry;
464 	struct tog_colors colors;
465 };
466 
467 struct tog_reflist_entry {
468 	TAILQ_ENTRY(tog_reflist_entry) entry;
469 	struct got_reference *ref;
470 	int idx;
471 };
472 
473 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
474 
475 struct tog_ref_view_state {
476 	struct tog_reflist_head refs;
477 	struct tog_reflist_entry *first_displayed_entry;
478 	struct tog_reflist_entry *last_displayed_entry;
479 	struct tog_reflist_entry *selected_entry;
480 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
481 	struct got_repository *repo;
482 	struct tog_reflist_entry *matched_entry;
483 	struct tog_colors colors;
484 };
485 
486 /*
487  * We implement two types of views: parent views and child views.
488  *
489  * The 'Tab' key switches focus between a parent view and its child view.
490  * Child views are shown side-by-side to their parent view, provided
491  * there is enough screen estate.
492  *
493  * When a new view is opened from within a parent view, this new view
494  * becomes a child view of the parent view, replacing any existing child.
495  *
496  * When a new view is opened from within a child view, this new view
497  * becomes a parent view which will obscure the views below until the
498  * user quits the new parent view by typing 'q'.
499  *
500  * This list of views contains parent views only.
501  * Child views are only pointed to by their parent view.
502  */
503 TAILQ_HEAD(tog_view_list_head, tog_view);
504 
505 struct tog_view {
506 	TAILQ_ENTRY(tog_view) entry;
507 	WINDOW *window;
508 	PANEL *panel;
509 	int nlines, ncols, begin_y, begin_x;
510 	int maxx, x; /* max column and current start column */
511 	int lines, cols; /* copies of LINES and COLS */
512 	int focussed; /* Only set on one parent or child view at a time. */
513 	int dying;
514 	struct tog_view *parent;
515 	struct tog_view *child;
516 
517 	/*
518 	 * This flag is initially set on parent views when a new child view
519 	 * is created. It gets toggled when the 'Tab' key switches focus
520 	 * between parent and child.
521 	 * The flag indicates whether focus should be passed on to our child
522 	 * view if this parent view gets picked for focus after another parent
523 	 * view was closed. This prevents child views from losing focus in such
524 	 * situations.
525 	 */
526 	int focus_child;
527 
528 	/* type-specific state */
529 	enum tog_view_type type;
530 	union {
531 		struct tog_diff_view_state diff;
532 		struct tog_log_view_state log;
533 		struct tog_blame_view_state blame;
534 		struct tog_tree_view_state tree;
535 		struct tog_ref_view_state ref;
536 	} state;
537 
538 	const struct got_error *(*show)(struct tog_view *);
539 	const struct got_error *(*input)(struct tog_view **,
540 	    struct tog_view *, int);
541 	const struct got_error *(*close)(struct tog_view *);
542 
543 	const struct got_error *(*search_start)(struct tog_view *);
544 	const struct got_error *(*search_next)(struct tog_view *);
545 	int search_started;
546 	int searching;
547 #define TOG_SEARCH_FORWARD	1
548 #define TOG_SEARCH_BACKWARD	2
549 	int search_next_done;
550 #define TOG_SEARCH_HAVE_MORE	1
551 #define TOG_SEARCH_NO_MORE	2
552 #define TOG_SEARCH_HAVE_NONE	3
553 	regex_t regex;
554 	regmatch_t regmatch;
555 };
556 
557 static const struct got_error *open_diff_view(struct tog_view *,
558     struct got_object_id *, struct got_object_id *,
559     const char *, const char *, int, int, int, struct tog_view *,
560     struct got_repository *);
561 static const struct got_error *show_diff_view(struct tog_view *);
562 static const struct got_error *input_diff_view(struct tog_view **,
563     struct tog_view *, int);
564 static const struct got_error* close_diff_view(struct tog_view *);
565 static const struct got_error *search_start_diff_view(struct tog_view *);
566 static const struct got_error *search_next_diff_view(struct tog_view *);
567 
568 static const struct got_error *open_log_view(struct tog_view *,
569     struct got_object_id *, struct got_repository *,
570     const char *, const char *, int);
571 static const struct got_error * show_log_view(struct tog_view *);
572 static const struct got_error *input_log_view(struct tog_view **,
573     struct tog_view *, int);
574 static const struct got_error *close_log_view(struct tog_view *);
575 static const struct got_error *search_start_log_view(struct tog_view *);
576 static const struct got_error *search_next_log_view(struct tog_view *);
577 
578 static const struct got_error *open_blame_view(struct tog_view *, char *,
579     struct got_object_id *, struct got_repository *);
580 static const struct got_error *show_blame_view(struct tog_view *);
581 static const struct got_error *input_blame_view(struct tog_view **,
582     struct tog_view *, int);
583 static const struct got_error *close_blame_view(struct tog_view *);
584 static const struct got_error *search_start_blame_view(struct tog_view *);
585 static const struct got_error *search_next_blame_view(struct tog_view *);
586 
587 static const struct got_error *open_tree_view(struct tog_view *,
588     struct got_object_id *, const char *, struct got_repository *);
589 static const struct got_error *show_tree_view(struct tog_view *);
590 static const struct got_error *input_tree_view(struct tog_view **,
591     struct tog_view *, int);
592 static const struct got_error *close_tree_view(struct tog_view *);
593 static const struct got_error *search_start_tree_view(struct tog_view *);
594 static const struct got_error *search_next_tree_view(struct tog_view *);
595 
596 static const struct got_error *open_ref_view(struct tog_view *,
597     struct got_repository *);
598 static const struct got_error *show_ref_view(struct tog_view *);
599 static const struct got_error *input_ref_view(struct tog_view **,
600     struct tog_view *, int);
601 static const struct got_error *close_ref_view(struct tog_view *);
602 static const struct got_error *search_start_ref_view(struct tog_view *);
603 static const struct got_error *search_next_ref_view(struct tog_view *);
604 
605 static volatile sig_atomic_t tog_sigwinch_received;
606 static volatile sig_atomic_t tog_sigpipe_received;
607 static volatile sig_atomic_t tog_sigcont_received;
608 static volatile sig_atomic_t tog_sigint_received;
609 static volatile sig_atomic_t tog_sigterm_received;
610 
611 static void
612 tog_sigwinch(int signo)
613 {
614 	tog_sigwinch_received = 1;
615 }
616 
617 static void
618 tog_sigpipe(int signo)
619 {
620 	tog_sigpipe_received = 1;
621 }
622 
623 static void
624 tog_sigcont(int signo)
625 {
626 	tog_sigcont_received = 1;
627 }
628 
629 static void
630 tog_sigint(int signo)
631 {
632 	tog_sigint_received = 1;
633 }
634 
635 static void
636 tog_sigterm(int signo)
637 {
638 	tog_sigterm_received = 1;
639 }
640 
641 static int
642 tog_fatal_signal_received(void)
643 {
644 	return (tog_sigpipe_received ||
645 	    tog_sigint_received || tog_sigint_received);
646 }
647 
648 
649 static const struct got_error *
650 view_close(struct tog_view *view)
651 {
652 	const struct got_error *err = NULL;
653 
654 	if (view->child) {
655 		view_close(view->child);
656 		view->child = NULL;
657 	}
658 	if (view->close)
659 		err = view->close(view);
660 	if (view->panel)
661 		del_panel(view->panel);
662 	if (view->window)
663 		delwin(view->window);
664 	free(view);
665 	return err;
666 }
667 
668 static struct tog_view *
669 view_open(int nlines, int ncols, int begin_y, int begin_x,
670     enum tog_view_type type)
671 {
672 	struct tog_view *view = calloc(1, sizeof(*view));
673 
674 	if (view == NULL)
675 		return NULL;
676 
677 	view->type = type;
678 	view->lines = LINES;
679 	view->cols = COLS;
680 	view->nlines = nlines ? nlines : LINES - begin_y;
681 	view->ncols = ncols ? ncols : COLS - begin_x;
682 	view->begin_y = begin_y;
683 	view->begin_x = begin_x;
684 	view->window = newwin(nlines, ncols, begin_y, begin_x);
685 	if (view->window == NULL) {
686 		view_close(view);
687 		return NULL;
688 	}
689 	view->panel = new_panel(view->window);
690 	if (view->panel == NULL ||
691 	    set_panel_userptr(view->panel, view) != OK) {
692 		view_close(view);
693 		return NULL;
694 	}
695 
696 	keypad(view->window, TRUE);
697 	return view;
698 }
699 
700 static int
701 view_split_begin_x(int begin_x)
702 {
703 	if (begin_x > 0 || COLS < 120)
704 		return 0;
705 	return (COLS - MAX(COLS / 2, 80));
706 }
707 
708 static const struct got_error *view_resize(struct tog_view *);
709 
710 static const struct got_error *
711 view_splitscreen(struct tog_view *view)
712 {
713 	const struct got_error *err = NULL;
714 
715 	view->begin_y = 0;
716 	view->begin_x = view_split_begin_x(0);
717 	view->nlines = LINES;
718 	view->ncols = COLS - view->begin_x;
719 	view->lines = LINES;
720 	view->cols = COLS;
721 	err = view_resize(view);
722 	if (err)
723 		return err;
724 
725 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
726 		return got_error_from_errno("mvwin");
727 
728 	return NULL;
729 }
730 
731 static const struct got_error *
732 view_fullscreen(struct tog_view *view)
733 {
734 	const struct got_error *err = NULL;
735 
736 	view->begin_x = 0;
737 	view->begin_y = 0;
738 	view->nlines = LINES;
739 	view->ncols = COLS;
740 	view->lines = LINES;
741 	view->cols = COLS;
742 	err = view_resize(view);
743 	if (err)
744 		return err;
745 
746 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
747 		return got_error_from_errno("mvwin");
748 
749 	return NULL;
750 }
751 
752 static int
753 view_is_parent_view(struct tog_view *view)
754 {
755 	return view->parent == NULL;
756 }
757 
758 static int
759 view_is_splitscreen(struct tog_view *view)
760 {
761 	return view->begin_x > 0;
762 }
763 
764 
765 static const struct got_error *
766 view_resize(struct tog_view *view)
767 {
768 	int nlines, ncols;
769 
770 	if (view->lines > LINES)
771 		nlines = view->nlines - (view->lines - LINES);
772 	else
773 		nlines = view->nlines + (LINES - view->lines);
774 
775 	if (view->cols > COLS)
776 		ncols = view->ncols - (view->cols - COLS);
777 	else
778 		ncols = view->ncols + (COLS - view->cols);
779 
780 	if (view->child && view_is_splitscreen(view->child)) {
781 		view->child->begin_x = view_split_begin_x(view->begin_x);
782 		if (view->child->begin_x == 0) {
783 			ncols = COLS;
784 
785 			view_fullscreen(view->child);
786 			if (view->child->focussed)
787 				show_panel(view->child->panel);
788 			else
789 				show_panel(view->panel);
790 		} else {
791 			ncols = view->child->begin_x;
792 
793 			view_splitscreen(view->child);
794 			show_panel(view->child->panel);
795 		}
796 	} else if (view->parent == NULL)
797 		ncols = COLS;
798 
799 	if (wresize(view->window, nlines, ncols) == ERR)
800 		return got_error_from_errno("wresize");
801 	if (replace_panel(view->panel, view->window) == ERR)
802 		return got_error_from_errno("replace_panel");
803 	wclear(view->window);
804 
805 	view->nlines = nlines;
806 	view->ncols = ncols;
807 	view->lines = LINES;
808 	view->cols = COLS;
809 
810 	return NULL;
811 }
812 
813 static const struct got_error *
814 view_close_child(struct tog_view *view)
815 {
816 	const struct got_error *err = NULL;
817 
818 	if (view->child == NULL)
819 		return NULL;
820 
821 	err = view_close(view->child);
822 	view->child = NULL;
823 	return err;
824 }
825 
826 static const struct got_error *
827 view_set_child(struct tog_view *view, struct tog_view *child)
828 {
829 	view->child = child;
830 	child->parent = view;
831 
832 	return view_resize(view);
833 }
834 
835 static void
836 tog_resizeterm(void)
837 {
838 	int cols, lines;
839 	struct winsize size;
840 
841 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
842 		cols = 80;     /* Default */
843 		lines = 24;
844 	} else {
845 		cols = size.ws_col;
846 		lines = size.ws_row;
847 	}
848 	resize_term(lines, cols);
849 }
850 
851 static const struct got_error *
852 view_search_start(struct tog_view *view)
853 {
854 	const struct got_error *err = NULL;
855 	char pattern[1024];
856 	int ret;
857 
858 	if (view->search_started) {
859 		regfree(&view->regex);
860 		view->searching = 0;
861 		memset(&view->regmatch, 0, sizeof(view->regmatch));
862 	}
863 	view->search_started = 0;
864 
865 	if (view->nlines < 1)
866 		return NULL;
867 
868 	mvwaddstr(view->window, view->begin_y + view->nlines - 1, 0, "/");
869 	wclrtoeol(view->window);
870 
871 	nocbreak();
872 	echo();
873 	ret = wgetnstr(view->window, pattern, sizeof(pattern));
874 	cbreak();
875 	noecho();
876 	if (ret == ERR)
877 		return NULL;
878 
879 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
880 		err = view->search_start(view);
881 		if (err) {
882 			regfree(&view->regex);
883 			return err;
884 		}
885 		view->search_started = 1;
886 		view->searching = TOG_SEARCH_FORWARD;
887 		view->search_next_done = 0;
888 		view->search_next(view);
889 	}
890 
891 	return NULL;
892 }
893 
894 static const struct got_error *
895 view_input(struct tog_view **new, int *done, struct tog_view *view,
896     struct tog_view_list_head *views)
897 {
898 	const struct got_error *err = NULL;
899 	struct tog_view *v;
900 	int ch, errcode;
901 
902 	*new = NULL;
903 
904 	/* Clear "no matches" indicator. */
905 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
906 	    view->search_next_done == TOG_SEARCH_HAVE_NONE)
907 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
908 
909 	if (view->searching && !view->search_next_done) {
910 		errcode = pthread_mutex_unlock(&tog_mutex);
911 		if (errcode)
912 			return got_error_set_errno(errcode,
913 			    "pthread_mutex_unlock");
914 		sched_yield();
915 		errcode = pthread_mutex_lock(&tog_mutex);
916 		if (errcode)
917 			return got_error_set_errno(errcode,
918 			    "pthread_mutex_lock");
919 		view->search_next(view);
920 		return NULL;
921 	}
922 
923 	nodelay(stdscr, FALSE);
924 	/* Allow threads to make progress while we are waiting for input. */
925 	errcode = pthread_mutex_unlock(&tog_mutex);
926 	if (errcode)
927 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
928 	ch = wgetch(view->window);
929 	errcode = pthread_mutex_lock(&tog_mutex);
930 	if (errcode)
931 		return got_error_set_errno(errcode, "pthread_mutex_lock");
932 	nodelay(stdscr, TRUE);
933 
934 	if (tog_sigwinch_received || tog_sigcont_received) {
935 		tog_resizeterm();
936 		tog_sigwinch_received = 0;
937 		tog_sigcont_received = 0;
938 		TAILQ_FOREACH(v, views, entry) {
939 			err = view_resize(v);
940 			if (err)
941 				return err;
942 			err = v->input(new, v, KEY_RESIZE);
943 			if (err)
944 				return err;
945 			if (v->child) {
946 				err = view_resize(v->child);
947 				if (err)
948 					return err;
949 				err = v->child->input(new, v->child,
950 				    KEY_RESIZE);
951 				if (err)
952 					return err;
953 			}
954 		}
955 	}
956 
957 	switch (ch) {
958 	case '\t':
959 		if (view->child) {
960 			view->focussed = 0;
961 			view->child->focussed = 1;
962 			view->focus_child = 1;
963 		} else if (view->parent) {
964 			view->focussed = 0;
965 			view->parent->focussed = 1;
966 			view->parent->focus_child = 0;
967 			if (!view_is_splitscreen(view))
968 				err = view_fullscreen(view->parent);
969 		}
970 		break;
971 	case 'q':
972 		err = view->input(new, view, ch);
973 		view->dying = 1;
974 		break;
975 	case 'Q':
976 		*done = 1;
977 		break;
978 	case 'F':
979 		if (view_is_parent_view(view)) {
980 			if (view->child == NULL)
981 				break;
982 			if (view_is_splitscreen(view->child)) {
983 				view->focussed = 0;
984 				view->child->focussed = 1;
985 				err = view_fullscreen(view->child);
986 			} else
987 				err = view_splitscreen(view->child);
988 			if (err)
989 				break;
990 			err = view->child->input(new, view->child,
991 			    KEY_RESIZE);
992 		} else {
993 			if (view_is_splitscreen(view)) {
994 				view->parent->focussed = 0;
995 				view->focussed = 1;
996 				err = view_fullscreen(view);
997 			} else {
998 				err = view_splitscreen(view);
999 				if (!err)
1000 					err = view_resize(view->parent);
1001 			}
1002 			if (err)
1003 				break;
1004 			err = view->input(new, view, KEY_RESIZE);
1005 		}
1006 		break;
1007 	case KEY_RESIZE:
1008 		break;
1009 	case '/':
1010 		if (view->search_start)
1011 			view_search_start(view);
1012 		else
1013 			err = view->input(new, view, ch);
1014 		break;
1015 	case 'N':
1016 	case 'n':
1017 		if (view->search_started && view->search_next) {
1018 			view->searching = (ch == 'n' ?
1019 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1020 			view->search_next_done = 0;
1021 			view->search_next(view);
1022 		} else
1023 			err = view->input(new, view, ch);
1024 		break;
1025 	default:
1026 		err = view->input(new, view, ch);
1027 		break;
1028 	}
1029 
1030 	return err;
1031 }
1032 
1033 void
1034 view_vborder(struct tog_view *view)
1035 {
1036 	PANEL *panel;
1037 	const struct tog_view *view_above;
1038 
1039 	if (view->parent)
1040 		return view_vborder(view->parent);
1041 
1042 	panel = panel_above(view->panel);
1043 	if (panel == NULL)
1044 		return;
1045 
1046 	view_above = panel_userptr(panel);
1047 	mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
1048 	    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
1049 }
1050 
1051 int
1052 view_needs_focus_indication(struct tog_view *view)
1053 {
1054 	if (view_is_parent_view(view)) {
1055 		if (view->child == NULL || view->child->focussed)
1056 			return 0;
1057 		if (!view_is_splitscreen(view->child))
1058 			return 0;
1059 	} else if (!view_is_splitscreen(view))
1060 		return 0;
1061 
1062 	return view->focussed;
1063 }
1064 
1065 static const struct got_error *
1066 view_loop(struct tog_view *view)
1067 {
1068 	const struct got_error *err = NULL;
1069 	struct tog_view_list_head views;
1070 	struct tog_view *new_view;
1071 	int fast_refresh = 10;
1072 	int done = 0, errcode;
1073 
1074 	errcode = pthread_mutex_lock(&tog_mutex);
1075 	if (errcode)
1076 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1077 
1078 	TAILQ_INIT(&views);
1079 	TAILQ_INSERT_HEAD(&views, view, entry);
1080 
1081 	view->focussed = 1;
1082 	err = view->show(view);
1083 	if (err)
1084 		return err;
1085 	update_panels();
1086 	doupdate();
1087 	while (!TAILQ_EMPTY(&views) && !done && !tog_fatal_signal_received()) {
1088 		/* Refresh fast during initialization, then become slower. */
1089 		if (fast_refresh && fast_refresh-- == 0)
1090 			halfdelay(10); /* switch to once per second */
1091 
1092 		err = view_input(&new_view, &done, view, &views);
1093 		if (err)
1094 			break;
1095 		if (view->dying) {
1096 			struct tog_view *v, *prev = NULL;
1097 
1098 			if (view_is_parent_view(view))
1099 				prev = TAILQ_PREV(view, tog_view_list_head,
1100 				    entry);
1101 			else if (view->parent)
1102 				prev = view->parent;
1103 
1104 			if (view->parent) {
1105 				view->parent->child = NULL;
1106 				view->parent->focus_child = 0;
1107 
1108 				err = view_resize(view->parent);
1109 				if (err)
1110 					break;
1111 			} else
1112 				TAILQ_REMOVE(&views, view, entry);
1113 
1114 			err = view_close(view);
1115 			if (err)
1116 				goto done;
1117 
1118 			view = NULL;
1119 			TAILQ_FOREACH(v, &views, entry) {
1120 				if (v->focussed)
1121 					break;
1122 			}
1123 			if (view == NULL && new_view == NULL) {
1124 				/* No view has focus. Try to pick one. */
1125 				if (prev)
1126 					view = prev;
1127 				else if (!TAILQ_EMPTY(&views)) {
1128 					view = TAILQ_LAST(&views,
1129 					    tog_view_list_head);
1130 				}
1131 				if (view) {
1132 					if (view->focus_child) {
1133 						view->child->focussed = 1;
1134 						view = view->child;
1135 					} else
1136 						view->focussed = 1;
1137 				}
1138 			}
1139 		}
1140 		if (new_view) {
1141 			struct tog_view *v, *t;
1142 			/* Only allow one parent view per type. */
1143 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1144 				if (v->type != new_view->type)
1145 					continue;
1146 				TAILQ_REMOVE(&views, v, entry);
1147 				err = view_close(v);
1148 				if (err)
1149 					goto done;
1150 				break;
1151 			}
1152 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1153 			view = new_view;
1154 		}
1155 		if (view) {
1156 			if (view_is_parent_view(view)) {
1157 				if (view->child && view->child->focussed)
1158 					view = view->child;
1159 			} else {
1160 				if (view->parent && view->parent->focussed)
1161 					view = view->parent;
1162 			}
1163 			show_panel(view->panel);
1164 			if (view->child && view_is_splitscreen(view->child))
1165 				show_panel(view->child->panel);
1166 			if (view->parent && view_is_splitscreen(view)) {
1167 				err = view->parent->show(view->parent);
1168 				if (err)
1169 					goto done;
1170 			}
1171 			err = view->show(view);
1172 			if (err)
1173 				goto done;
1174 			if (view->child) {
1175 				err = view->child->show(view->child);
1176 				if (err)
1177 					goto done;
1178 			}
1179 			update_panels();
1180 			doupdate();
1181 		}
1182 	}
1183 done:
1184 	while (!TAILQ_EMPTY(&views)) {
1185 		view = TAILQ_FIRST(&views);
1186 		TAILQ_REMOVE(&views, view, entry);
1187 		view_close(view);
1188 	}
1189 
1190 	errcode = pthread_mutex_unlock(&tog_mutex);
1191 	if (errcode && err == NULL)
1192 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1193 
1194 	return err;
1195 }
1196 
1197 __dead static void
1198 usage_log(void)
1199 {
1200 	endwin();
1201 	fprintf(stderr,
1202 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1203 	    getprogname());
1204 	exit(1);
1205 }
1206 
1207 /* Create newly allocated wide-character string equivalent to a byte string. */
1208 static const struct got_error *
1209 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1210 {
1211 	char *vis = NULL;
1212 	const struct got_error *err = NULL;
1213 
1214 	*ws = NULL;
1215 	*wlen = mbstowcs(NULL, s, 0);
1216 	if (*wlen == (size_t)-1) {
1217 		int vislen;
1218 		if (errno != EILSEQ)
1219 			return got_error_from_errno("mbstowcs");
1220 
1221 		/* byte string invalid in current encoding; try to "fix" it */
1222 		err = got_mbsavis(&vis, &vislen, s);
1223 		if (err)
1224 			return err;
1225 		*wlen = mbstowcs(NULL, vis, 0);
1226 		if (*wlen == (size_t)-1) {
1227 			err = got_error_from_errno("mbstowcs"); /* give up */
1228 			goto done;
1229 		}
1230 	}
1231 
1232 	*ws = calloc(*wlen + 1, sizeof(**ws));
1233 	if (*ws == NULL) {
1234 		err = got_error_from_errno("calloc");
1235 		goto done;
1236 	}
1237 
1238 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1239 		err = got_error_from_errno("mbstowcs");
1240 done:
1241 	free(vis);
1242 	if (err) {
1243 		free(*ws);
1244 		*ws = NULL;
1245 		*wlen = 0;
1246 	}
1247 	return err;
1248 }
1249 
1250 static const struct got_error *
1251 expand_tab(char **ptr, const char *src)
1252 {
1253 	char	*dst;
1254 	size_t	 len, n, idx = 0, sz = 0;
1255 
1256 	*ptr = NULL;
1257 	n = len = strlen(src);
1258 	dst = malloc(n + 1);
1259 	if (dst == NULL)
1260 		return got_error_from_errno("malloc");
1261 
1262 	while (idx < len && src[idx]) {
1263 		const char c = src[idx];
1264 
1265 		if (c == '\t') {
1266 			size_t nb = TABSIZE - sz % TABSIZE;
1267 			char *p;
1268 
1269 			p = realloc(dst, n + nb);
1270 			if (p == NULL) {
1271 				free(dst);
1272 				return got_error_from_errno("realloc");
1273 
1274 			}
1275 			dst = p;
1276 			n += nb;
1277 			memset(dst + sz, ' ', nb);
1278 			sz += nb;
1279 		} else
1280 			dst[sz++] = src[idx];
1281 		++idx;
1282 	}
1283 
1284 	dst[sz] = '\0';
1285 	*ptr = dst;
1286 	return NULL;
1287 }
1288 
1289 /*
1290  * Advance at most n columns from wline starting at offset off.
1291  * Return the index to the first character after the span operation.
1292  * Return the combined column width of all spanned wide character in
1293  * *rcol.
1294  */
1295 static int
1296 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1297 {
1298 	int width, i, cols = 0;
1299 
1300 	if (n == 0) {
1301 		*rcol = cols;
1302 		return off;
1303 	}
1304 
1305 	for (i = off; wline[i] != L'\0'; ++i) {
1306 		if (wline[i] == L'\t')
1307 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1308 		else
1309 			width = wcwidth(wline[i]);
1310 
1311 		if (width == -1) {
1312 			width = 1;
1313 			wline[i] = L'.';
1314 		}
1315 
1316 		if (cols + width > n)
1317 			break;
1318 		cols += width;
1319 	}
1320 
1321 	*rcol = cols;
1322 	return i;
1323 }
1324 
1325 /*
1326  * Format a line for display, ensuring that it won't overflow a width limit.
1327  * With scrolling, the width returned refers to the scrolled version of the
1328  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1329  */
1330 static const struct got_error *
1331 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1332     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1333 {
1334 	const struct got_error *err = NULL;
1335 	int cols;
1336 	wchar_t *wline = NULL;
1337 	char *exstr = NULL;
1338 	size_t wlen;
1339 	int i, scrollx;
1340 
1341 	*wlinep = NULL;
1342 	*widthp = 0;
1343 
1344 	if (expand) {
1345 		err = expand_tab(&exstr, line);
1346 		if (err)
1347 			return err;
1348 	}
1349 
1350 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1351 	free(exstr);
1352 	if (err)
1353 		return err;
1354 
1355 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1356 
1357 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1358 		wline[wlen - 1] = L'\0';
1359 		wlen--;
1360 	}
1361 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1362 		wline[wlen - 1] = L'\0';
1363 		wlen--;
1364 	}
1365 
1366 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1367 	wline[i] = L'\0';
1368 
1369 	if (widthp)
1370 		*widthp = cols;
1371 	if (scrollxp)
1372 		*scrollxp = scrollx;
1373 	if (err)
1374 		free(wline);
1375 	else
1376 		*wlinep = wline;
1377 	return err;
1378 }
1379 
1380 static const struct got_error*
1381 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1382     struct got_object_id *id, struct got_repository *repo)
1383 {
1384 	static const struct got_error *err = NULL;
1385 	struct got_reflist_entry *re;
1386 	char *s;
1387 	const char *name;
1388 
1389 	*refs_str = NULL;
1390 
1391 	TAILQ_FOREACH(re, refs, entry) {
1392 		struct got_tag_object *tag = NULL;
1393 		struct got_object_id *ref_id;
1394 		int cmp;
1395 
1396 		name = got_ref_get_name(re->ref);
1397 		if (strcmp(name, GOT_REF_HEAD) == 0)
1398 			continue;
1399 		if (strncmp(name, "refs/", 5) == 0)
1400 			name += 5;
1401 		if (strncmp(name, "got/", 4) == 0 &&
1402 		    strncmp(name, "got/backup/", 11) != 0)
1403 			continue;
1404 		if (strncmp(name, "heads/", 6) == 0)
1405 			name += 6;
1406 		if (strncmp(name, "remotes/", 8) == 0) {
1407 			name += 8;
1408 			s = strstr(name, "/" GOT_REF_HEAD);
1409 			if (s != NULL && s[strlen(s)] == '\0')
1410 				continue;
1411 		}
1412 		err = got_ref_resolve(&ref_id, repo, re->ref);
1413 		if (err)
1414 			break;
1415 		if (strncmp(name, "tags/", 5) == 0) {
1416 			err = got_object_open_as_tag(&tag, repo, ref_id);
1417 			if (err) {
1418 				if (err->code != GOT_ERR_OBJ_TYPE) {
1419 					free(ref_id);
1420 					break;
1421 				}
1422 				/* Ref points at something other than a tag. */
1423 				err = NULL;
1424 				tag = NULL;
1425 			}
1426 		}
1427 		cmp = got_object_id_cmp(tag ?
1428 		    got_object_tag_get_object_id(tag) : ref_id, id);
1429 		free(ref_id);
1430 		if (tag)
1431 			got_object_tag_close(tag);
1432 		if (cmp != 0)
1433 			continue;
1434 		s = *refs_str;
1435 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1436 		    s ? ", " : "", name) == -1) {
1437 			err = got_error_from_errno("asprintf");
1438 			free(s);
1439 			*refs_str = NULL;
1440 			break;
1441 		}
1442 		free(s);
1443 	}
1444 
1445 	return err;
1446 }
1447 
1448 static const struct got_error *
1449 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1450     int col_tab_align)
1451 {
1452 	char *smallerthan;
1453 
1454 	smallerthan = strchr(author, '<');
1455 	if (smallerthan && smallerthan[1] != '\0')
1456 		author = smallerthan + 1;
1457 	author[strcspn(author, "@>")] = '\0';
1458 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1459 	    col_tab_align, 0);
1460 }
1461 
1462 static const struct got_error *
1463 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1464     struct got_object_id *id, const size_t date_display_cols,
1465     int author_display_cols)
1466 {
1467 	struct tog_log_view_state *s = &view->state.log;
1468 	const struct got_error *err = NULL;
1469 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1470 	char *logmsg0 = NULL, *logmsg = NULL;
1471 	char *author = NULL;
1472 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1473 	int author_width, logmsg_width;
1474 	char *newline, *line = NULL;
1475 	int col, limit, scrollx;
1476 	const int avail = view->ncols;
1477 	struct tm tm;
1478 	time_t committer_time;
1479 	struct tog_color *tc;
1480 
1481 	committer_time = got_object_commit_get_committer_time(commit);
1482 	if (gmtime_r(&committer_time, &tm) == NULL)
1483 		return got_error_from_errno("gmtime_r");
1484 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1485 		return got_error(GOT_ERR_NO_SPACE);
1486 
1487 	if (avail <= date_display_cols)
1488 		limit = MIN(sizeof(datebuf) - 1, avail);
1489 	else
1490 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1491 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1492 	if (tc)
1493 		wattr_on(view->window,
1494 		    COLOR_PAIR(tc->colorpair), NULL);
1495 	waddnstr(view->window, datebuf, limit);
1496 	if (tc)
1497 		wattr_off(view->window,
1498 		    COLOR_PAIR(tc->colorpair), NULL);
1499 	col = limit;
1500 	if (col > avail)
1501 		goto done;
1502 
1503 	if (avail >= 120) {
1504 		char *id_str;
1505 		err = got_object_id_str(&id_str, id);
1506 		if (err)
1507 			goto done;
1508 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1509 		if (tc)
1510 			wattr_on(view->window,
1511 			    COLOR_PAIR(tc->colorpair), NULL);
1512 		wprintw(view->window, "%.8s ", id_str);
1513 		if (tc)
1514 			wattr_off(view->window,
1515 			    COLOR_PAIR(tc->colorpair), NULL);
1516 		free(id_str);
1517 		col += 9;
1518 		if (col > avail)
1519 			goto done;
1520 	}
1521 
1522 	author = strdup(got_object_commit_get_author(commit));
1523 	if (author == NULL) {
1524 		err = got_error_from_errno("strdup");
1525 		goto done;
1526 	}
1527 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1528 	if (err)
1529 		goto done;
1530 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1531 	if (tc)
1532 		wattr_on(view->window,
1533 		    COLOR_PAIR(tc->colorpair), NULL);
1534 	waddwstr(view->window, wauthor);
1535 	if (tc)
1536 		wattr_off(view->window,
1537 		    COLOR_PAIR(tc->colorpair), NULL);
1538 	col += author_width;
1539 	while (col < avail && author_width < author_display_cols + 2) {
1540 		waddch(view->window, ' ');
1541 		col++;
1542 		author_width++;
1543 	}
1544 	if (col > avail)
1545 		goto done;
1546 
1547 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1548 	if (err)
1549 		goto done;
1550 	logmsg = logmsg0;
1551 	while (*logmsg == '\n')
1552 		logmsg++;
1553 	newline = strchr(logmsg, '\n');
1554 	if (newline)
1555 		*newline = '\0';
1556 	limit = avail - col;
1557 	if (view->child && view_is_splitscreen(view->child) && limit > 0)
1558 		limit--;	/* for the border */
1559 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
1560 	    limit, col, 1);
1561 	if (err)
1562 		goto done;
1563 	waddwstr(view->window, &wlogmsg[scrollx]);
1564 	col += MAX(logmsg_width, 0);
1565 	while (col < avail) {
1566 		waddch(view->window, ' ');
1567 		col++;
1568 	}
1569 done:
1570 	free(logmsg0);
1571 	free(wlogmsg);
1572 	free(author);
1573 	free(wauthor);
1574 	free(line);
1575 	return err;
1576 }
1577 
1578 static struct commit_queue_entry *
1579 alloc_commit_queue_entry(struct got_commit_object *commit,
1580     struct got_object_id *id)
1581 {
1582 	struct commit_queue_entry *entry;
1583 
1584 	entry = calloc(1, sizeof(*entry));
1585 	if (entry == NULL)
1586 		return NULL;
1587 
1588 	entry->id = id;
1589 	entry->commit = commit;
1590 	return entry;
1591 }
1592 
1593 static void
1594 pop_commit(struct commit_queue *commits)
1595 {
1596 	struct commit_queue_entry *entry;
1597 
1598 	entry = TAILQ_FIRST(&commits->head);
1599 	TAILQ_REMOVE(&commits->head, entry, entry);
1600 	got_object_commit_close(entry->commit);
1601 	commits->ncommits--;
1602 	/* Don't free entry->id! It is owned by the commit graph. */
1603 	free(entry);
1604 }
1605 
1606 static void
1607 free_commits(struct commit_queue *commits)
1608 {
1609 	while (!TAILQ_EMPTY(&commits->head))
1610 		pop_commit(commits);
1611 }
1612 
1613 static const struct got_error *
1614 match_commit(int *have_match, struct got_object_id *id,
1615     struct got_commit_object *commit, regex_t *regex)
1616 {
1617 	const struct got_error *err = NULL;
1618 	regmatch_t regmatch;
1619 	char *id_str = NULL, *logmsg = NULL;
1620 
1621 	*have_match = 0;
1622 
1623 	err = got_object_id_str(&id_str, id);
1624 	if (err)
1625 		return err;
1626 
1627 	err = got_object_commit_get_logmsg(&logmsg, commit);
1628 	if (err)
1629 		goto done;
1630 
1631 	if (regexec(regex, got_object_commit_get_author(commit), 1,
1632 	    &regmatch, 0) == 0 ||
1633 	    regexec(regex, got_object_commit_get_committer(commit), 1,
1634 	    &regmatch, 0) == 0 ||
1635 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
1636 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
1637 		*have_match = 1;
1638 done:
1639 	free(id_str);
1640 	free(logmsg);
1641 	return err;
1642 }
1643 
1644 static const struct got_error *
1645 queue_commits(struct tog_log_thread_args *a)
1646 {
1647 	const struct got_error *err = NULL;
1648 
1649 	/*
1650 	 * We keep all commits open throughout the lifetime of the log
1651 	 * view in order to avoid having to re-fetch commits from disk
1652 	 * while updating the display.
1653 	 */
1654 	do {
1655 		struct got_object_id *id;
1656 		struct got_commit_object *commit;
1657 		struct commit_queue_entry *entry;
1658 		int errcode;
1659 
1660 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
1661 		    NULL, NULL);
1662 		if (err || id == NULL)
1663 			break;
1664 
1665 		err = got_object_open_as_commit(&commit, a->repo, id);
1666 		if (err)
1667 			break;
1668 		entry = alloc_commit_queue_entry(commit, id);
1669 		if (entry == NULL) {
1670 			err = got_error_from_errno("alloc_commit_queue_entry");
1671 			break;
1672 		}
1673 
1674 		errcode = pthread_mutex_lock(&tog_mutex);
1675 		if (errcode) {
1676 			err = got_error_set_errno(errcode,
1677 			    "pthread_mutex_lock");
1678 			break;
1679 		}
1680 
1681 		entry->idx = a->commits->ncommits;
1682 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
1683 		a->commits->ncommits++;
1684 
1685 		if (*a->searching == TOG_SEARCH_FORWARD &&
1686 		    !*a->search_next_done) {
1687 			int have_match;
1688 			err = match_commit(&have_match, id, commit, a->regex);
1689 			if (err)
1690 				break;
1691 			if (have_match)
1692 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
1693 		}
1694 
1695 		errcode = pthread_mutex_unlock(&tog_mutex);
1696 		if (errcode && err == NULL)
1697 			err = got_error_set_errno(errcode,
1698 			    "pthread_mutex_unlock");
1699 		if (err)
1700 			break;
1701 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
1702 
1703 	return err;
1704 }
1705 
1706 static void
1707 select_commit(struct tog_log_view_state *s)
1708 {
1709 	struct commit_queue_entry *entry;
1710 	int ncommits = 0;
1711 
1712 	entry = s->first_displayed_entry;
1713 	while (entry) {
1714 		if (ncommits == s->selected) {
1715 			s->selected_entry = entry;
1716 			break;
1717 		}
1718 		entry = TAILQ_NEXT(entry, entry);
1719 		ncommits++;
1720 	}
1721 }
1722 
1723 static const struct got_error *
1724 draw_commits(struct tog_view *view)
1725 {
1726 	const struct got_error *err = NULL;
1727 	struct tog_log_view_state *s = &view->state.log;
1728 	struct commit_queue_entry *entry = s->selected_entry;
1729 	const int limit = view->nlines;
1730 	int width;
1731 	int ncommits, author_cols = 4;
1732 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1733 	char *refs_str = NULL;
1734 	wchar_t *wline;
1735 	struct tog_color *tc;
1736 	static const size_t date_display_cols = 12;
1737 
1738 	if (s->selected_entry &&
1739 	    !(view->searching && view->search_next_done == 0)) {
1740 		struct got_reflist_head *refs;
1741 		err = got_object_id_str(&id_str, s->selected_entry->id);
1742 		if (err)
1743 			return err;
1744 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
1745 		    s->selected_entry->id);
1746 		if (refs) {
1747 			err = build_refs_str(&refs_str, refs,
1748 			    s->selected_entry->id, s->repo);
1749 			if (err)
1750 				goto done;
1751 		}
1752 	}
1753 
1754 	if (s->thread_args.commits_needed == 0)
1755 		halfdelay(10); /* disable fast refresh */
1756 
1757 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
1758 		if (asprintf(&ncommits_str, " [%d/%d] %s",
1759 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
1760 		    (view->searching && !view->search_next_done) ?
1761 		    "searching..." : "loading...") == -1) {
1762 			err = got_error_from_errno("asprintf");
1763 			goto done;
1764 		}
1765 	} else {
1766 		const char *search_str = NULL;
1767 
1768 		if (view->searching) {
1769 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
1770 				search_str = "no more matches";
1771 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
1772 				search_str = "no matches found";
1773 			else if (!view->search_next_done)
1774 				search_str = "searching...";
1775 		}
1776 
1777 		if (asprintf(&ncommits_str, " [%d/%d] %s",
1778 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
1779 		    search_str ? search_str :
1780 		    (refs_str ? refs_str : "")) == -1) {
1781 			err = got_error_from_errno("asprintf");
1782 			goto done;
1783 		}
1784 	}
1785 
1786 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
1787 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
1788 		    "........................................",
1789 		    s->in_repo_path, ncommits_str) == -1) {
1790 			err = got_error_from_errno("asprintf");
1791 			header = NULL;
1792 			goto done;
1793 		}
1794 	} else if (asprintf(&header, "commit %s%s",
1795 	    id_str ? id_str : "........................................",
1796 	    ncommits_str) == -1) {
1797 		err = got_error_from_errno("asprintf");
1798 		header = NULL;
1799 		goto done;
1800 	}
1801 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
1802 	if (err)
1803 		goto done;
1804 
1805 	werase(view->window);
1806 
1807 	if (view_needs_focus_indication(view))
1808 		wstandout(view->window);
1809 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1810 	if (tc)
1811 		wattr_on(view->window,
1812 		    COLOR_PAIR(tc->colorpair), NULL);
1813 	waddwstr(view->window, wline);
1814 	if (tc)
1815 		wattr_off(view->window,
1816 		    COLOR_PAIR(tc->colorpair), NULL);
1817 	while (width < view->ncols) {
1818 		waddch(view->window, ' ');
1819 		width++;
1820 	}
1821 	if (view_needs_focus_indication(view))
1822 		wstandend(view->window);
1823 	free(wline);
1824 	if (limit <= 1)
1825 		goto done;
1826 
1827 	/* Grow author column size if necessary, and set view->maxx. */
1828 	entry = s->first_displayed_entry;
1829 	ncommits = 0;
1830 	view->maxx = 0;
1831 	while (entry) {
1832 		char *author, *eol, *msg, *msg0;
1833 		wchar_t *wauthor, *wmsg;
1834 		int width;
1835 		if (ncommits >= limit - 1)
1836 			break;
1837 		author = strdup(got_object_commit_get_author(entry->commit));
1838 		if (author == NULL) {
1839 			err = got_error_from_errno("strdup");
1840 			goto done;
1841 		}
1842 		err = format_author(&wauthor, &width, author, COLS,
1843 		    date_display_cols);
1844 		if (author_cols < width)
1845 			author_cols = width;
1846 		free(wauthor);
1847 		free(author);
1848 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
1849 		if (err)
1850 			goto done;
1851 		msg = msg0;
1852 		while (*msg == '\n')
1853 			++msg;
1854 		if ((eol = strchr(msg, '\n')))
1855 			*eol = '\0';
1856 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
1857 		    date_display_cols + author_cols, 0);
1858 		if (err)
1859 			goto done;
1860 		view->maxx = MAX(view->maxx, width);
1861 		free(msg0);
1862 		free(wmsg);
1863 		ncommits++;
1864 		entry = TAILQ_NEXT(entry, entry);
1865 	}
1866 
1867 	entry = s->first_displayed_entry;
1868 	s->last_displayed_entry = s->first_displayed_entry;
1869 	ncommits = 0;
1870 	while (entry) {
1871 		if (ncommits >= limit - 1)
1872 			break;
1873 		if (ncommits == s->selected)
1874 			wstandout(view->window);
1875 		err = draw_commit(view, entry->commit, entry->id,
1876 		    date_display_cols, author_cols);
1877 		if (ncommits == s->selected)
1878 			wstandend(view->window);
1879 		if (err)
1880 			goto done;
1881 		ncommits++;
1882 		s->last_displayed_entry = entry;
1883 		entry = TAILQ_NEXT(entry, entry);
1884 	}
1885 
1886 	view_vborder(view);
1887 	update_panels();
1888 	doupdate();
1889 done:
1890 	free(id_str);
1891 	free(refs_str);
1892 	free(ncommits_str);
1893 	free(header);
1894 	return err;
1895 }
1896 
1897 static void
1898 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
1899 {
1900 	struct commit_queue_entry *entry;
1901 	int nscrolled = 0;
1902 
1903 	entry = TAILQ_FIRST(&s->commits.head);
1904 	if (s->first_displayed_entry == entry)
1905 		return;
1906 
1907 	entry = s->first_displayed_entry;
1908 	while (entry && nscrolled < maxscroll) {
1909 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1910 		if (entry) {
1911 			s->first_displayed_entry = entry;
1912 			nscrolled++;
1913 		}
1914 	}
1915 }
1916 
1917 static const struct got_error *
1918 trigger_log_thread(struct tog_view *view, int wait)
1919 {
1920 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
1921 	int errcode;
1922 
1923 	halfdelay(1); /* fast refresh while loading commits */
1924 
1925 	while (ta->commits_needed > 0 || ta->load_all) {
1926 		if (ta->log_complete)
1927 			break;
1928 
1929 		/* Wake the log thread. */
1930 		errcode = pthread_cond_signal(&ta->need_commits);
1931 		if (errcode)
1932 			return got_error_set_errno(errcode,
1933 			    "pthread_cond_signal");
1934 
1935 		/*
1936 		 * The mutex will be released while the view loop waits
1937 		 * in wgetch(), at which time the log thread will run.
1938 		 */
1939 		if (!wait)
1940 			break;
1941 
1942 		/* Display progress update in log view. */
1943 		show_log_view(view);
1944 		update_panels();
1945 		doupdate();
1946 
1947 		/* Wait right here while next commit is being loaded. */
1948 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
1949 		if (errcode)
1950 			return got_error_set_errno(errcode,
1951 			    "pthread_cond_wait");
1952 
1953 		/* Display progress update in log view. */
1954 		show_log_view(view);
1955 		update_panels();
1956 		doupdate();
1957 	}
1958 
1959 	return NULL;
1960 }
1961 
1962 static const struct got_error *
1963 log_scroll_down(struct tog_view *view, int maxscroll)
1964 {
1965 	struct tog_log_view_state *s = &view->state.log;
1966 	const struct got_error *err = NULL;
1967 	struct commit_queue_entry *pentry;
1968 	int nscrolled = 0, ncommits_needed;
1969 
1970 	if (s->last_displayed_entry == NULL)
1971 		return NULL;
1972 
1973 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
1974 	if (s->commits.ncommits < ncommits_needed &&
1975 	    !s->thread_args.log_complete) {
1976 		/*
1977 		 * Ask the log thread for required amount of commits.
1978 		 */
1979 		s->thread_args.commits_needed += maxscroll;
1980 		err = trigger_log_thread(view, 1);
1981 		if (err)
1982 			return err;
1983 	}
1984 
1985 	do {
1986 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
1987 		if (pentry == NULL)
1988 			break;
1989 
1990 		s->last_displayed_entry = pentry;
1991 
1992 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
1993 		if (pentry == NULL)
1994 			break;
1995 		s->first_displayed_entry = pentry;
1996 	} while (++nscrolled < maxscroll);
1997 
1998 	return err;
1999 }
2000 
2001 static const struct got_error *
2002 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
2003     struct got_commit_object *commit, struct got_object_id *commit_id,
2004     struct tog_view *log_view, struct got_repository *repo)
2005 {
2006 	const struct got_error *err;
2007 	struct got_object_qid *parent_id;
2008 	struct tog_view *diff_view;
2009 
2010 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
2011 	if (diff_view == NULL)
2012 		return got_error_from_errno("view_open");
2013 
2014 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2015 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2016 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2017 	if (err == NULL)
2018 		*new_view = diff_view;
2019 	return err;
2020 }
2021 
2022 static const struct got_error *
2023 tree_view_visit_subtree(struct tog_tree_view_state *s,
2024     struct got_tree_object *subtree)
2025 {
2026 	struct tog_parent_tree *parent;
2027 
2028 	parent = calloc(1, sizeof(*parent));
2029 	if (parent == NULL)
2030 		return got_error_from_errno("calloc");
2031 
2032 	parent->tree = s->tree;
2033 	parent->first_displayed_entry = s->first_displayed_entry;
2034 	parent->selected_entry = s->selected_entry;
2035 	parent->selected = s->selected;
2036 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2037 	s->tree = subtree;
2038 	s->selected = 0;
2039 	s->first_displayed_entry = NULL;
2040 	return NULL;
2041 }
2042 
2043 static const struct got_error *
2044 tree_view_walk_path(struct tog_tree_view_state *s,
2045     struct got_commit_object *commit, const char *path)
2046 {
2047 	const struct got_error *err = NULL;
2048 	struct got_tree_object *tree = NULL;
2049 	const char *p;
2050 	char *slash, *subpath = NULL;
2051 
2052 	/* Walk the path and open corresponding tree objects. */
2053 	p = path;
2054 	while (*p) {
2055 		struct got_tree_entry *te;
2056 		struct got_object_id *tree_id;
2057 		char *te_name;
2058 
2059 		while (p[0] == '/')
2060 			p++;
2061 
2062 		/* Ensure the correct subtree entry is selected. */
2063 		slash = strchr(p, '/');
2064 		if (slash == NULL)
2065 			te_name = strdup(p);
2066 		else
2067 			te_name = strndup(p, slash - p);
2068 		if (te_name == NULL) {
2069 			err = got_error_from_errno("strndup");
2070 			break;
2071 		}
2072 		te = got_object_tree_find_entry(s->tree, te_name);
2073 		if (te == NULL) {
2074 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2075 			free(te_name);
2076 			break;
2077 		}
2078 		free(te_name);
2079 		s->first_displayed_entry = s->selected_entry = te;
2080 
2081 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2082 			break; /* jump to this file's entry */
2083 
2084 		slash = strchr(p, '/');
2085 		if (slash)
2086 			subpath = strndup(path, slash - path);
2087 		else
2088 			subpath = strdup(path);
2089 		if (subpath == NULL) {
2090 			err = got_error_from_errno("strdup");
2091 			break;
2092 		}
2093 
2094 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2095 		    subpath);
2096 		if (err)
2097 			break;
2098 
2099 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2100 		free(tree_id);
2101 		if (err)
2102 			break;
2103 
2104 		err = tree_view_visit_subtree(s, tree);
2105 		if (err) {
2106 			got_object_tree_close(tree);
2107 			break;
2108 		}
2109 		if (slash == NULL)
2110 			break;
2111 		free(subpath);
2112 		subpath = NULL;
2113 		p = slash;
2114 	}
2115 
2116 	free(subpath);
2117 	return err;
2118 }
2119 
2120 static const struct got_error *
2121 browse_commit_tree(struct tog_view **new_view, int begin_x,
2122     struct commit_queue_entry *entry, const char *path,
2123     const char *head_ref_name, struct got_repository *repo)
2124 {
2125 	const struct got_error *err = NULL;
2126 	struct tog_tree_view_state *s;
2127 	struct tog_view *tree_view;
2128 
2129 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
2130 	if (tree_view == NULL)
2131 		return got_error_from_errno("view_open");
2132 
2133 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2134 	if (err)
2135 		return err;
2136 	s = &tree_view->state.tree;
2137 
2138 	*new_view = tree_view;
2139 
2140 	if (got_path_is_root_dir(path))
2141 		return NULL;
2142 
2143 	return tree_view_walk_path(s, entry->commit, path);
2144 }
2145 
2146 static const struct got_error *
2147 block_signals_used_by_main_thread(void)
2148 {
2149 	sigset_t sigset;
2150 	int errcode;
2151 
2152 	if (sigemptyset(&sigset) == -1)
2153 		return got_error_from_errno("sigemptyset");
2154 
2155 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2156 	if (sigaddset(&sigset, SIGWINCH) == -1)
2157 		return got_error_from_errno("sigaddset");
2158 	if (sigaddset(&sigset, SIGCONT) == -1)
2159 		return got_error_from_errno("sigaddset");
2160 	if (sigaddset(&sigset, SIGINT) == -1)
2161 		return got_error_from_errno("sigaddset");
2162 	if (sigaddset(&sigset, SIGTERM) == -1)
2163 		return got_error_from_errno("sigaddset");
2164 
2165 	/* ncurses handles SIGTSTP */
2166 	if (sigaddset(&sigset, SIGTSTP) == -1)
2167 		return got_error_from_errno("sigaddset");
2168 
2169 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2170 	if (errcode)
2171 		return got_error_set_errno(errcode, "pthread_sigmask");
2172 
2173 	return NULL;
2174 }
2175 
2176 static void *
2177 log_thread(void *arg)
2178 {
2179 	const struct got_error *err = NULL;
2180 	int errcode = 0;
2181 	struct tog_log_thread_args *a = arg;
2182 	int done = 0;
2183 
2184 	err = block_signals_used_by_main_thread();
2185 	if (err)
2186 		return (void *)err;
2187 
2188 	while (!done && !err && !tog_fatal_signal_received()) {
2189 		err = queue_commits(a);
2190 		if (err) {
2191 			if (err->code != GOT_ERR_ITER_COMPLETED)
2192 				return (void *)err;
2193 			err = NULL;
2194 			done = 1;
2195 		} else if (a->commits_needed > 0 && !a->load_all)
2196 			a->commits_needed--;
2197 
2198 		errcode = pthread_mutex_lock(&tog_mutex);
2199 		if (errcode) {
2200 			err = got_error_set_errno(errcode,
2201 			    "pthread_mutex_lock");
2202 			break;
2203 		} else if (*a->quit)
2204 			done = 1;
2205 		else if (*a->first_displayed_entry == NULL) {
2206 			*a->first_displayed_entry =
2207 			    TAILQ_FIRST(&a->commits->head);
2208 			*a->selected_entry = *a->first_displayed_entry;
2209 		}
2210 
2211 		errcode = pthread_cond_signal(&a->commit_loaded);
2212 		if (errcode) {
2213 			err = got_error_set_errno(errcode,
2214 			    "pthread_cond_signal");
2215 			pthread_mutex_unlock(&tog_mutex);
2216 			break;
2217 		}
2218 
2219 		if (done)
2220 			a->commits_needed = 0;
2221 		else {
2222 			if (a->commits_needed == 0 && !a->load_all) {
2223 				errcode = pthread_cond_wait(&a->need_commits,
2224 				    &tog_mutex);
2225 				if (errcode)
2226 					err = got_error_set_errno(errcode,
2227 					    "pthread_cond_wait");
2228 				if (*a->quit)
2229 					done = 1;
2230 			}
2231 		}
2232 
2233 		errcode = pthread_mutex_unlock(&tog_mutex);
2234 		if (errcode && err == NULL)
2235 			err = got_error_set_errno(errcode,
2236 			    "pthread_mutex_unlock");
2237 	}
2238 	a->log_complete = 1;
2239 	return (void *)err;
2240 }
2241 
2242 static const struct got_error *
2243 stop_log_thread(struct tog_log_view_state *s)
2244 {
2245 	const struct got_error *err = NULL;
2246 	int errcode;
2247 
2248 	if (s->thread) {
2249 		s->quit = 1;
2250 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2251 		if (errcode)
2252 			return got_error_set_errno(errcode,
2253 			    "pthread_cond_signal");
2254 		errcode = pthread_mutex_unlock(&tog_mutex);
2255 		if (errcode)
2256 			return got_error_set_errno(errcode,
2257 			    "pthread_mutex_unlock");
2258 		errcode = pthread_join(s->thread, (void **)&err);
2259 		if (errcode)
2260 			return got_error_set_errno(errcode, "pthread_join");
2261 		errcode = pthread_mutex_lock(&tog_mutex);
2262 		if (errcode)
2263 			return got_error_set_errno(errcode,
2264 			    "pthread_mutex_lock");
2265 		s->thread = 0; //NULL;
2266 	}
2267 
2268 	if (s->thread_args.repo) {
2269 		err = got_repo_close(s->thread_args.repo);
2270 		s->thread_args.repo = NULL;
2271 	}
2272 
2273 	if (s->thread_args.pack_fds) {
2274 		const struct got_error *pack_err =
2275 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2276 		if (err == NULL)
2277 			err = pack_err;
2278 		s->thread_args.pack_fds = NULL;
2279 	}
2280 
2281 	if (s->thread_args.graph) {
2282 		got_commit_graph_close(s->thread_args.graph);
2283 		s->thread_args.graph = NULL;
2284 	}
2285 
2286 	return err;
2287 }
2288 
2289 static const struct got_error *
2290 close_log_view(struct tog_view *view)
2291 {
2292 	const struct got_error *err = NULL;
2293 	struct tog_log_view_state *s = &view->state.log;
2294 	int errcode;
2295 
2296 	err = stop_log_thread(s);
2297 
2298 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2299 	if (errcode && err == NULL)
2300 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2301 
2302 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2303 	if (errcode && err == NULL)
2304 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2305 
2306 	free_commits(&s->commits);
2307 	free(s->in_repo_path);
2308 	s->in_repo_path = NULL;
2309 	free(s->start_id);
2310 	s->start_id = NULL;
2311 	free(s->head_ref_name);
2312 	s->head_ref_name = NULL;
2313 	return err;
2314 }
2315 
2316 static const struct got_error *
2317 search_start_log_view(struct tog_view *view)
2318 {
2319 	struct tog_log_view_state *s = &view->state.log;
2320 
2321 	s->matched_entry = NULL;
2322 	s->search_entry = NULL;
2323 	return NULL;
2324 }
2325 
2326 static const struct got_error *
2327 search_next_log_view(struct tog_view *view)
2328 {
2329 	const struct got_error *err = NULL;
2330 	struct tog_log_view_state *s = &view->state.log;
2331 	struct commit_queue_entry *entry;
2332 
2333 	/* Display progress update in log view. */
2334 	show_log_view(view);
2335 	update_panels();
2336 	doupdate();
2337 
2338 	if (s->search_entry) {
2339 		int errcode, ch;
2340 		errcode = pthread_mutex_unlock(&tog_mutex);
2341 		if (errcode)
2342 			return got_error_set_errno(errcode,
2343 			    "pthread_mutex_unlock");
2344 		ch = wgetch(view->window);
2345 		errcode = pthread_mutex_lock(&tog_mutex);
2346 		if (errcode)
2347 			return got_error_set_errno(errcode,
2348 			    "pthread_mutex_lock");
2349 		if (ch == KEY_BACKSPACE) {
2350 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2351 			return NULL;
2352 		}
2353 		if (view->searching == TOG_SEARCH_FORWARD)
2354 			entry = TAILQ_NEXT(s->search_entry, entry);
2355 		else
2356 			entry = TAILQ_PREV(s->search_entry,
2357 			    commit_queue_head, entry);
2358 	} else if (s->matched_entry) {
2359 		int matched_idx = s->matched_entry->idx;
2360 		int selected_idx = s->selected_entry->idx;
2361 
2362 		/*
2363 		 * If the user has moved the cursor after we hit a match,
2364 		 * the position from where we should continue searching
2365 		 * might have changed.
2366 		 */
2367 		if (view->searching == TOG_SEARCH_FORWARD) {
2368 			if (matched_idx > selected_idx)
2369 				entry = TAILQ_NEXT(s->selected_entry, entry);
2370 			else
2371 				entry = TAILQ_NEXT(s->matched_entry, entry);
2372 		} else {
2373 			if (matched_idx < selected_idx)
2374 				entry = TAILQ_PREV(s->selected_entry,
2375 						commit_queue_head, entry);
2376 			else
2377 				entry = TAILQ_PREV(s->matched_entry,
2378 						commit_queue_head, entry);
2379 		}
2380 	} else {
2381 		entry = s->selected_entry;
2382 	}
2383 
2384 	while (1) {
2385 		int have_match = 0;
2386 
2387 		if (entry == NULL) {
2388 			if (s->thread_args.log_complete ||
2389 			    view->searching == TOG_SEARCH_BACKWARD) {
2390 				view->search_next_done =
2391 				    (s->matched_entry == NULL ?
2392 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2393 				s->search_entry = NULL;
2394 				return NULL;
2395 			}
2396 			/*
2397 			 * Poke the log thread for more commits and return,
2398 			 * allowing the main loop to make progress. Search
2399 			 * will resume at s->search_entry once we come back.
2400 			 */
2401 			s->thread_args.commits_needed++;
2402 			return trigger_log_thread(view, 0);
2403 		}
2404 
2405 		err = match_commit(&have_match, entry->id, entry->commit,
2406 		    &view->regex);
2407 		if (err)
2408 			break;
2409 		if (have_match) {
2410 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2411 			s->matched_entry = entry;
2412 			break;
2413 		}
2414 
2415 		s->search_entry = entry;
2416 		if (view->searching == TOG_SEARCH_FORWARD)
2417 			entry = TAILQ_NEXT(entry, entry);
2418 		else
2419 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2420 	}
2421 
2422 	if (s->matched_entry) {
2423 		int cur = s->selected_entry->idx;
2424 		while (cur < s->matched_entry->idx) {
2425 			err = input_log_view(NULL, view, KEY_DOWN);
2426 			if (err)
2427 				return err;
2428 			cur++;
2429 		}
2430 		while (cur > s->matched_entry->idx) {
2431 			err = input_log_view(NULL, view, KEY_UP);
2432 			if (err)
2433 				return err;
2434 			cur--;
2435 		}
2436 	}
2437 
2438 	s->search_entry = NULL;
2439 
2440 	return NULL;
2441 }
2442 
2443 static const struct got_error *
2444 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2445     struct got_repository *repo, const char *head_ref_name,
2446     const char *in_repo_path, int log_branches)
2447 {
2448 	const struct got_error *err = NULL;
2449 	struct tog_log_view_state *s = &view->state.log;
2450 	struct got_repository *thread_repo = NULL;
2451 	struct got_commit_graph *thread_graph = NULL;
2452 	int errcode;
2453 
2454 	if (in_repo_path != s->in_repo_path) {
2455 		free(s->in_repo_path);
2456 		s->in_repo_path = strdup(in_repo_path);
2457 		if (s->in_repo_path == NULL)
2458 			return got_error_from_errno("strdup");
2459 	}
2460 
2461 	/* The commit queue only contains commits being displayed. */
2462 	TAILQ_INIT(&s->commits.head);
2463 	s->commits.ncommits = 0;
2464 
2465 	s->repo = repo;
2466 	if (head_ref_name) {
2467 		s->head_ref_name = strdup(head_ref_name);
2468 		if (s->head_ref_name == NULL) {
2469 			err = got_error_from_errno("strdup");
2470 			goto done;
2471 		}
2472 	}
2473 	s->start_id = got_object_id_dup(start_id);
2474 	if (s->start_id == NULL) {
2475 		err = got_error_from_errno("got_object_id_dup");
2476 		goto done;
2477 	}
2478 	s->log_branches = log_branches;
2479 
2480 	STAILQ_INIT(&s->colors);
2481 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2482 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2483 		    get_color_value("TOG_COLOR_COMMIT"));
2484 		if (err)
2485 			goto done;
2486 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2487 		    get_color_value("TOG_COLOR_AUTHOR"));
2488 		if (err) {
2489 			free_colors(&s->colors);
2490 			goto done;
2491 		}
2492 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2493 		    get_color_value("TOG_COLOR_DATE"));
2494 		if (err) {
2495 			free_colors(&s->colors);
2496 			goto done;
2497 		}
2498 	}
2499 
2500 	view->show = show_log_view;
2501 	view->input = input_log_view;
2502 	view->close = close_log_view;
2503 	view->search_start = search_start_log_view;
2504 	view->search_next = search_next_log_view;
2505 
2506 	if (s->thread_args.pack_fds == NULL) {
2507 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2508 		if (err)
2509 			goto done;
2510 	}
2511 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
2512 	    s->thread_args.pack_fds);
2513 	if (err)
2514 		goto done;
2515 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
2516 	    !s->log_branches);
2517 	if (err)
2518 		goto done;
2519 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
2520 	    s->repo, NULL, NULL);
2521 	if (err)
2522 		goto done;
2523 
2524 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
2525 	if (errcode) {
2526 		err = got_error_set_errno(errcode, "pthread_cond_init");
2527 		goto done;
2528 	}
2529 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
2530 	if (errcode) {
2531 		err = got_error_set_errno(errcode, "pthread_cond_init");
2532 		goto done;
2533 	}
2534 
2535 	s->thread_args.commits_needed = view->nlines;
2536 	s->thread_args.graph = thread_graph;
2537 	s->thread_args.commits = &s->commits;
2538 	s->thread_args.in_repo_path = s->in_repo_path;
2539 	s->thread_args.start_id = s->start_id;
2540 	s->thread_args.repo = thread_repo;
2541 	s->thread_args.log_complete = 0;
2542 	s->thread_args.quit = &s->quit;
2543 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
2544 	s->thread_args.selected_entry = &s->selected_entry;
2545 	s->thread_args.searching = &view->searching;
2546 	s->thread_args.search_next_done = &view->search_next_done;
2547 	s->thread_args.regex = &view->regex;
2548 done:
2549 	if (err)
2550 		close_log_view(view);
2551 	return err;
2552 }
2553 
2554 static const struct got_error *
2555 show_log_view(struct tog_view *view)
2556 {
2557 	const struct got_error *err;
2558 	struct tog_log_view_state *s = &view->state.log;
2559 
2560 	if (s->thread == 0) { //NULL) {
2561 		int errcode = pthread_create(&s->thread, NULL, log_thread,
2562 		    &s->thread_args);
2563 		if (errcode)
2564 			return got_error_set_errno(errcode, "pthread_create");
2565 		if (s->thread_args.commits_needed > 0) {
2566 			err = trigger_log_thread(view, 1);
2567 			if (err)
2568 				return err;
2569 		}
2570 	}
2571 
2572 	return draw_commits(view);
2573 }
2574 
2575 static const struct got_error *
2576 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
2577 {
2578 	const struct got_error *err = NULL;
2579 	struct tog_log_view_state *s = &view->state.log;
2580 	struct tog_view *diff_view = NULL, *tree_view = NULL;
2581 	struct tog_view *ref_view = NULL;
2582 	struct commit_queue_entry *entry;
2583 	int begin_x = 0, n, nscroll = view->nlines - 1;
2584 
2585 	if (s->thread_args.load_all) {
2586 		if (ch == KEY_BACKSPACE)
2587 			s->thread_args.load_all = 0;
2588 		else if (s->thread_args.log_complete) {
2589 			s->thread_args.load_all = 0;
2590 			log_scroll_down(view, s->commits.ncommits);
2591 			s->selected = MIN(view->nlines - 2,
2592 			    s->commits.ncommits - 1);
2593 			select_commit(s);
2594 		}
2595 		return NULL;
2596 	}
2597 
2598 	switch (ch) {
2599 	case 'q':
2600 		s->quit = 1;
2601 		break;
2602 	case '0':
2603 		view->x = 0;
2604 		break;
2605 	case '$':
2606 		view->x = MAX(view->maxx - view->ncols / 2, 0);
2607 		break;
2608 	case KEY_RIGHT:
2609 	case 'l':
2610 		if (view->x + view->ncols / 2 < view->maxx)
2611 			view->x += 2;  /* move two columns right */
2612 		break;
2613 	case KEY_LEFT:
2614 	case 'h':
2615 		view->x -= MIN(view->x, 2);  /* move two columns back */
2616 		break;
2617 	case 'k':
2618 	case KEY_UP:
2619 	case '<':
2620 	case ',':
2621 	case CTRL('p'):
2622 		if (s->first_displayed_entry == NULL)
2623 			break;
2624 		if (s->selected > 0)
2625 			s->selected--;
2626 		else
2627 			log_scroll_up(s, 1);
2628 		select_commit(s);
2629 		break;
2630 	case 'g':
2631 	case KEY_HOME:
2632 		s->selected = 0;
2633 		s->first_displayed_entry = TAILQ_FIRST(&s->commits.head);
2634 		select_commit(s);
2635 		break;
2636 	case CTRL('u'):
2637 	case 'u':
2638 		nscroll /= 2;
2639 		/* FALL THROUGH */
2640 	case KEY_PPAGE:
2641 	case CTRL('b'):
2642 	case 'b':
2643 		if (s->first_displayed_entry == NULL)
2644 			break;
2645 		if (TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
2646 			s->selected = MAX(0, s->selected - nscroll - 1);
2647 		else
2648 			log_scroll_up(s, nscroll);
2649 		select_commit(s);
2650 		break;
2651 	case 'j':
2652 	case KEY_DOWN:
2653 	case '>':
2654 	case '.':
2655 	case CTRL('n'):
2656 		if (s->first_displayed_entry == NULL)
2657 			break;
2658 		if (s->selected < MIN(view->nlines - 2,
2659 		    s->commits.ncommits - 1))
2660 			s->selected++;
2661 		else {
2662 			err = log_scroll_down(view, 1);
2663 			if (err)
2664 				break;
2665 		}
2666 		select_commit(s);
2667 		break;
2668 	case 'G':
2669 	case KEY_END: {
2670 		/* We don't know yet how many commits, so we're forced to
2671 		 * traverse them all. */
2672 		if (!s->thread_args.log_complete) {
2673 			s->thread_args.load_all = 1;
2674 			return trigger_log_thread(view, 0);
2675 		}
2676 
2677 		s->selected = 0;
2678 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
2679 		for (n = 0; n < view->nlines - 1; n++) {
2680 			if (entry == NULL)
2681 				break;
2682 			s->first_displayed_entry = entry;
2683 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2684 		}
2685 		if (n > 0)
2686 			s->selected = n - 1;
2687 		select_commit(s);
2688 		break;
2689 	}
2690 	case CTRL('d'):
2691 	case 'd':
2692 		nscroll /= 2;
2693 		/* FALL THROUGH */
2694 	case KEY_NPAGE:
2695 	case CTRL('f'):
2696 	case 'f':
2697 	case ' ': {
2698 		struct commit_queue_entry *first;
2699 		first = s->first_displayed_entry;
2700 		if (first == NULL)
2701 			break;
2702 		err = log_scroll_down(view, nscroll);
2703 		if (err)
2704 			break;
2705 		if (first == s->first_displayed_entry &&
2706 		    s->selected < MIN(view->nlines - 2,
2707 		    s->commits.ncommits - 1)) {
2708 			/* can't scroll further down */
2709 			s->selected += MIN(s->last_displayed_entry->idx -
2710 			    s->selected_entry->idx, nscroll + 1);
2711 		}
2712 		select_commit(s);
2713 		break;
2714 	}
2715 	case KEY_RESIZE:
2716 		if (s->selected > view->nlines - 2)
2717 			s->selected = view->nlines - 2;
2718 		if (s->selected > s->commits.ncommits - 1)
2719 			s->selected = s->commits.ncommits - 1;
2720 		select_commit(s);
2721 		if (s->commits.ncommits < view->nlines - 1 &&
2722 		    !s->thread_args.log_complete) {
2723 			s->thread_args.commits_needed += (view->nlines - 1) -
2724 			    s->commits.ncommits;
2725 			err = trigger_log_thread(view, 1);
2726 		}
2727 		break;
2728 	case KEY_ENTER:
2729 	case '\r':
2730 		if (s->selected_entry == NULL)
2731 			break;
2732 		if (view_is_parent_view(view))
2733 			begin_x = view_split_begin_x(view->begin_x);
2734 		err = open_diff_view_for_commit(&diff_view, begin_x,
2735 		    s->selected_entry->commit, s->selected_entry->id,
2736 		    view, s->repo);
2737 		if (err)
2738 			break;
2739 		view->focussed = 0;
2740 		diff_view->focussed = 1;
2741 		if (view_is_parent_view(view)) {
2742 			err = view_close_child(view);
2743 			if (err)
2744 				return err;
2745 			err = view_set_child(view, diff_view);
2746 			if (err)
2747 				return err;
2748 			view->focus_child = 1;
2749 		} else
2750 			*new_view = diff_view;
2751 		break;
2752 	case 't':
2753 		if (s->selected_entry == NULL)
2754 			break;
2755 		if (view_is_parent_view(view))
2756 			begin_x = view_split_begin_x(view->begin_x);
2757 		err = browse_commit_tree(&tree_view, begin_x,
2758 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
2759 		    s->repo);
2760 		if (err)
2761 			break;
2762 		view->focussed = 0;
2763 		tree_view->focussed = 1;
2764 		if (view_is_parent_view(view)) {
2765 			err = view_close_child(view);
2766 			if (err)
2767 				return err;
2768 			err = view_set_child(view, tree_view);
2769 			if (err)
2770 				return err;
2771 			view->focus_child = 1;
2772 		} else
2773 			*new_view = tree_view;
2774 		break;
2775 	case KEY_BACKSPACE:
2776 	case CTRL('l'):
2777 	case 'B':
2778 		if (ch == KEY_BACKSPACE &&
2779 		    got_path_is_root_dir(s->in_repo_path))
2780 			break;
2781 		err = stop_log_thread(s);
2782 		if (err)
2783 			return err;
2784 		if (ch == KEY_BACKSPACE) {
2785 			char *parent_path;
2786 			err = got_path_dirname(&parent_path, s->in_repo_path);
2787 			if (err)
2788 				return err;
2789 			free(s->in_repo_path);
2790 			s->in_repo_path = parent_path;
2791 			s->thread_args.in_repo_path = s->in_repo_path;
2792 		} else if (ch == CTRL('l')) {
2793 			struct got_object_id *start_id;
2794 			err = got_repo_match_object_id(&start_id, NULL,
2795 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
2796 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
2797 			if (err)
2798 				return err;
2799 			free(s->start_id);
2800 			s->start_id = start_id;
2801 			s->thread_args.start_id = s->start_id;
2802 		} else /* 'B' */
2803 			s->log_branches = !s->log_branches;
2804 
2805 		if (s->thread_args.pack_fds == NULL) {
2806 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2807 			if (err)
2808 				return err;
2809 		}
2810 		err = got_repo_open(&s->thread_args.repo,
2811 		    got_repo_get_path(s->repo), NULL,
2812 		    s->thread_args.pack_fds);
2813 		if (err)
2814 			return err;
2815 		tog_free_refs();
2816 		err = tog_load_refs(s->repo, 0);
2817 		if (err)
2818 			return err;
2819 		err = got_commit_graph_open(&s->thread_args.graph,
2820 		    s->in_repo_path, !s->log_branches);
2821 		if (err)
2822 			return err;
2823 		err = got_commit_graph_iter_start(s->thread_args.graph,
2824 		    s->start_id, s->repo, NULL, NULL);
2825 		if (err)
2826 			return err;
2827 		free_commits(&s->commits);
2828 		s->first_displayed_entry = NULL;
2829 		s->last_displayed_entry = NULL;
2830 		s->selected_entry = NULL;
2831 		s->selected = 0;
2832 		s->thread_args.log_complete = 0;
2833 		s->quit = 0;
2834 		s->thread_args.commits_needed = view->nlines;
2835 		s->matched_entry = NULL;
2836 		s->search_entry = NULL;
2837 		break;
2838 	case 'r':
2839 		if (view_is_parent_view(view))
2840 			begin_x = view_split_begin_x(view->begin_x);
2841 		ref_view = view_open(view->nlines, view->ncols,
2842 		    view->begin_y, begin_x, TOG_VIEW_REF);
2843 		if (ref_view == NULL)
2844 			return got_error_from_errno("view_open");
2845 		err = open_ref_view(ref_view, s->repo);
2846 		if (err) {
2847 			view_close(ref_view);
2848 			return err;
2849 		}
2850 		view->focussed = 0;
2851 		ref_view->focussed = 1;
2852 		if (view_is_parent_view(view)) {
2853 			err = view_close_child(view);
2854 			if (err)
2855 				return err;
2856 			err = view_set_child(view, ref_view);
2857 			if (err)
2858 				return err;
2859 			view->focus_child = 1;
2860 		} else
2861 			*new_view = ref_view;
2862 		break;
2863 	default:
2864 		break;
2865 	}
2866 
2867 	return err;
2868 }
2869 
2870 static const struct got_error *
2871 apply_unveil(const char *repo_path, const char *worktree_path)
2872 {
2873 	const struct got_error *error;
2874 
2875 #ifdef PROFILE
2876 	if (unveil("gmon.out", "rwc") != 0)
2877 		return got_error_from_errno2("unveil", "gmon.out");
2878 #endif
2879 	if (repo_path && unveil(repo_path, "r") != 0)
2880 		return got_error_from_errno2("unveil", repo_path);
2881 
2882 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
2883 		return got_error_from_errno2("unveil", worktree_path);
2884 
2885 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
2886 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
2887 
2888 	error = got_privsep_unveil_exec_helpers();
2889 	if (error != NULL)
2890 		return error;
2891 
2892 	if (unveil(NULL, NULL) != 0)
2893 		return got_error_from_errno("unveil");
2894 
2895 	return NULL;
2896 }
2897 
2898 static void
2899 init_curses(void)
2900 {
2901 	/*
2902 	 * Override default signal handlers before starting ncurses.
2903 	 * This should prevent ncurses from installing its own
2904 	 * broken cleanup() signal handler.
2905 	 */
2906 	signal(SIGWINCH, tog_sigwinch);
2907 	signal(SIGPIPE, tog_sigpipe);
2908 	signal(SIGCONT, tog_sigcont);
2909 	signal(SIGINT, tog_sigint);
2910 	signal(SIGTERM, tog_sigterm);
2911 
2912 	initscr();
2913 	cbreak();
2914 	halfdelay(1); /* Do fast refresh while initial view is loading. */
2915 	noecho();
2916 	nonl();
2917 	intrflush(stdscr, FALSE);
2918 	keypad(stdscr, TRUE);
2919 	curs_set(0);
2920 	if (getenv("TOG_COLORS") != NULL) {
2921 		start_color();
2922 		use_default_colors();
2923 	}
2924 }
2925 
2926 static const struct got_error *
2927 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
2928     struct got_repository *repo, struct got_worktree *worktree)
2929 {
2930 	const struct got_error *err = NULL;
2931 
2932 	if (argc == 0) {
2933 		*in_repo_path = strdup("/");
2934 		if (*in_repo_path == NULL)
2935 			return got_error_from_errno("strdup");
2936 		return NULL;
2937 	}
2938 
2939 	if (worktree) {
2940 		const char *prefix = got_worktree_get_path_prefix(worktree);
2941 		char *p;
2942 
2943 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
2944 		if (err)
2945 			return err;
2946 		if (asprintf(in_repo_path, "%s%s%s", prefix,
2947 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
2948 		    p) == -1) {
2949 			err = got_error_from_errno("asprintf");
2950 			*in_repo_path = NULL;
2951 		}
2952 		free(p);
2953 	} else
2954 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
2955 
2956 	return err;
2957 }
2958 
2959 static const struct got_error *
2960 cmd_log(int argc, char *argv[])
2961 {
2962 	const struct got_error *error;
2963 	struct got_repository *repo = NULL;
2964 	struct got_worktree *worktree = NULL;
2965 	struct got_object_id *start_id = NULL;
2966 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
2967 	char *start_commit = NULL, *label = NULL;
2968 	struct got_reference *ref = NULL;
2969 	const char *head_ref_name = NULL;
2970 	int ch, log_branches = 0;
2971 	struct tog_view *view;
2972 	int *pack_fds = NULL;
2973 
2974 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
2975 		switch (ch) {
2976 		case 'b':
2977 			log_branches = 1;
2978 			break;
2979 		case 'c':
2980 			start_commit = optarg;
2981 			break;
2982 		case 'r':
2983 			repo_path = realpath(optarg, NULL);
2984 			if (repo_path == NULL)
2985 				return got_error_from_errno2("realpath",
2986 				    optarg);
2987 			break;
2988 		default:
2989 			usage_log();
2990 			/* NOTREACHED */
2991 		}
2992 	}
2993 
2994 	argc -= optind;
2995 	argv += optind;
2996 
2997 	if (argc > 1)
2998 		usage_log();
2999 
3000 	error = got_repo_pack_fds_open(&pack_fds);
3001 	if (error != NULL)
3002 		goto done;
3003 
3004 	if (repo_path == NULL) {
3005 		cwd = getcwd(NULL, 0);
3006 		if (cwd == NULL)
3007 			return got_error_from_errno("getcwd");
3008 		error = got_worktree_open(&worktree, cwd);
3009 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3010 			goto done;
3011 		if (worktree)
3012 			repo_path =
3013 			    strdup(got_worktree_get_repo_path(worktree));
3014 		else
3015 			repo_path = strdup(cwd);
3016 		if (repo_path == NULL) {
3017 			error = got_error_from_errno("strdup");
3018 			goto done;
3019 		}
3020 	}
3021 
3022 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3023 	if (error != NULL)
3024 		goto done;
3025 
3026 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3027 	    repo, worktree);
3028 	if (error)
3029 		goto done;
3030 
3031 	init_curses();
3032 
3033 	error = apply_unveil(got_repo_get_path(repo),
3034 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3035 	if (error)
3036 		goto done;
3037 
3038 	/* already loaded by tog_log_with_path()? */
3039 	if (TAILQ_EMPTY(&tog_refs)) {
3040 		error = tog_load_refs(repo, 0);
3041 		if (error)
3042 			goto done;
3043 	}
3044 
3045 	if (start_commit == NULL) {
3046 		error = got_repo_match_object_id(&start_id, &label,
3047 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3048 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3049 		if (error)
3050 			goto done;
3051 		head_ref_name = label;
3052 	} else {
3053 		error = got_ref_open(&ref, repo, start_commit, 0);
3054 		if (error == NULL)
3055 			head_ref_name = got_ref_get_name(ref);
3056 		else if (error->code != GOT_ERR_NOT_REF)
3057 			goto done;
3058 		error = got_repo_match_object_id(&start_id, NULL,
3059 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3060 		if (error)
3061 			goto done;
3062 	}
3063 
3064 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3065 	if (view == NULL) {
3066 		error = got_error_from_errno("view_open");
3067 		goto done;
3068 	}
3069 	error = open_log_view(view, start_id, repo, head_ref_name,
3070 	    in_repo_path, log_branches);
3071 	if (error)
3072 		goto done;
3073 	if (worktree) {
3074 		/* Release work tree lock. */
3075 		got_worktree_close(worktree);
3076 		worktree = NULL;
3077 	}
3078 	error = view_loop(view);
3079 done:
3080 	free(in_repo_path);
3081 	free(repo_path);
3082 	free(cwd);
3083 	free(start_id);
3084 	free(label);
3085 	if (ref)
3086 		got_ref_close(ref);
3087 	if (repo) {
3088 		const struct got_error *close_err = got_repo_close(repo);
3089 		if (error == NULL)
3090 			error = close_err;
3091 	}
3092 	if (worktree)
3093 		got_worktree_close(worktree);
3094 	if (pack_fds) {
3095 		const struct got_error *pack_err =
3096 		    got_repo_pack_fds_close(pack_fds);
3097 		if (error == NULL)
3098 			error = pack_err;
3099 	}
3100 	tog_free_refs();
3101 	return error;
3102 }
3103 
3104 __dead static void
3105 usage_diff(void)
3106 {
3107 	endwin();
3108 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3109 	    "[-w] object1 object2\n", getprogname());
3110 	exit(1);
3111 }
3112 
3113 static int
3114 match_line(const char *line, regex_t *regex, size_t nmatch,
3115     regmatch_t *regmatch)
3116 {
3117 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3118 }
3119 
3120 struct tog_color *
3121 match_color(struct tog_colors *colors, const char *line)
3122 {
3123 	struct tog_color *tc = NULL;
3124 
3125 	STAILQ_FOREACH(tc, colors, entry) {
3126 		if (match_line(line, &tc->regex, 0, NULL))
3127 			return tc;
3128 	}
3129 
3130 	return NULL;
3131 }
3132 
3133 static const struct got_error *
3134 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3135     WINDOW *window, int skipcol, regmatch_t *regmatch)
3136 {
3137 	const struct got_error *err = NULL;
3138 	char *exstr = NULL;
3139 	wchar_t *wline = NULL;
3140 	int rme, rms, n, width, scrollx;
3141 	int width0 = 0, width1 = 0, width2 = 0;
3142 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3143 
3144 	*wtotal = 0;
3145 
3146 	rms = regmatch->rm_so;
3147 	rme = regmatch->rm_eo;
3148 
3149 	err = expand_tab(&exstr, line);
3150 	if (err)
3151 		return err;
3152 
3153 	/* Split the line into 3 segments, according to match offsets. */
3154 	seg0 = strndup(exstr, rms);
3155 	if (seg0 == NULL) {
3156 		err = got_error_from_errno("strndup");
3157 		goto done;
3158 	}
3159 	seg1 = strndup(exstr + rms, rme - rms);
3160 	if (seg1 == NULL) {
3161 		err = got_error_from_errno("strndup");
3162 		goto done;
3163 	}
3164 	seg2 = strdup(exstr + rme);
3165 	if (seg2 == NULL) {
3166 		err = got_error_from_errno("strndup");
3167 		goto done;
3168 	}
3169 
3170 	/* draw up to matched token if we haven't scrolled past it */
3171 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3172 	    col_tab_align, 1);
3173 	if (err)
3174 		goto done;
3175 	n = MAX(width0 - skipcol, 0);
3176 	if (n) {
3177 		free(wline);
3178 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3179 		    wlimit, col_tab_align, 1);
3180 		if (err)
3181 			goto done;
3182 		waddwstr(window, &wline[scrollx]);
3183 		wlimit -= width;
3184 		*wtotal += width;
3185 	}
3186 
3187 	if (wlimit > 0) {
3188 		int i = 0, w = 0;
3189 		size_t wlen;
3190 
3191 		free(wline);
3192 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3193 		    col_tab_align, 1);
3194 		if (err)
3195 			goto done;
3196 		wlen = wcslen(wline);
3197 		while (i < wlen) {
3198 			width = wcwidth(wline[i]);
3199 			if (width == -1) {
3200 				/* should not happen, tabs are expanded */
3201 				err = got_error(GOT_ERR_RANGE);
3202 				goto done;
3203 			}
3204 			if (width0 + w + width > skipcol)
3205 				break;
3206 			w += width;
3207 			i++;
3208 		}
3209 		/* draw (visible part of) matched token (if scrolled into it) */
3210 		if (width1 - w > 0) {
3211 			wattron(window, A_STANDOUT);
3212 			waddwstr(window, &wline[i]);
3213 			wattroff(window, A_STANDOUT);
3214 			wlimit -= (width1 - w);
3215 			*wtotal += (width1 - w);
3216 		}
3217 	}
3218 
3219 	if (wlimit > 0) {  /* draw rest of line */
3220 		free(wline);
3221 		if (skipcol > width0 + width1) {
3222 			err = format_line(&wline, &width2, &scrollx, seg2,
3223 			    skipcol - (width0 + width1), wlimit,
3224 			    col_tab_align, 1);
3225 			if (err)
3226 				goto done;
3227 			waddwstr(window, &wline[scrollx]);
3228 		} else {
3229 			err = format_line(&wline, &width2, NULL, seg2, 0,
3230 			    wlimit, col_tab_align, 1);
3231 			if (err)
3232 				goto done;
3233 			waddwstr(window, wline);
3234 		}
3235 		*wtotal += width2;
3236 	}
3237 done:
3238 	free(wline);
3239 	free(exstr);
3240 	free(seg0);
3241 	free(seg1);
3242 	free(seg2);
3243 	return err;
3244 }
3245 
3246 static const struct got_error *
3247 draw_file(struct tog_view *view, const char *header)
3248 {
3249 	struct tog_diff_view_state *s = &view->state.diff;
3250 	regmatch_t *regmatch = &view->regmatch;
3251 	const struct got_error *err;
3252 	int nprinted = 0;
3253 	char *line;
3254 	size_t linesize = 0;
3255 	ssize_t linelen;
3256 	struct tog_color *tc;
3257 	wchar_t *wline;
3258 	int width;
3259 	int max_lines = view->nlines;
3260 	int nlines = s->nlines;
3261 	off_t line_offset;
3262 
3263 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3264 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3265 		return got_error_from_errno("fseek");
3266 
3267 	werase(view->window);
3268 
3269 	if (header) {
3270 		if (asprintf(&line, "[%d/%d] %s",
3271 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3272 		    header) == -1)
3273 			return got_error_from_errno("asprintf");
3274 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3275 		    0, 0);
3276 		free(line);
3277 		if (err)
3278 			return err;
3279 
3280 		if (view_needs_focus_indication(view))
3281 			wstandout(view->window);
3282 		waddwstr(view->window, wline);
3283 		free(wline);
3284 		wline = NULL;
3285 		if (view_needs_focus_indication(view))
3286 			wstandend(view->window);
3287 		if (width <= view->ncols - 1)
3288 			waddch(view->window, '\n');
3289 
3290 		if (max_lines <= 1)
3291 			return NULL;
3292 		max_lines--;
3293 	}
3294 
3295 	s->eof = 0;
3296 	view->maxx = 0;
3297 	line = NULL;
3298 	while (max_lines > 0 && nprinted < max_lines) {
3299 		linelen = getline(&line, &linesize, s->f);
3300 		if (linelen == -1) {
3301 			if (feof(s->f)) {
3302 				s->eof = 1;
3303 				break;
3304 			}
3305 			free(line);
3306 			return got_ferror(s->f, GOT_ERR_IO);
3307 		}
3308 
3309 		/* Set view->maxx based on full line length. */
3310 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3311 		    view->x ? 1 : 0);
3312 		if (err) {
3313 			free(line);
3314 			return err;
3315 		}
3316 		view->maxx = MAX(view->maxx, width);
3317 		free(wline);
3318 		wline = NULL;
3319 
3320 		tc = match_color(&s->colors, line);
3321 		if (tc)
3322 			wattr_on(view->window,
3323 			    COLOR_PAIR(tc->colorpair), NULL);
3324 		if (s->first_displayed_line + nprinted == s->matched_line &&
3325 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3326 			err = add_matched_line(&width, line, view->ncols, 0,
3327 			    view->window, view->x, regmatch);
3328 			if (err) {
3329 				free(line);
3330 				return err;
3331 			}
3332 		} else {
3333 			int skip;
3334 			err = format_line(&wline, &width, &skip, line,
3335 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3336 			if (err) {
3337 				free(line);
3338 				return err;
3339 			}
3340 			waddwstr(view->window, &wline[skip]);
3341 			free(wline);
3342 			wline = NULL;
3343 		}
3344 		if (tc)
3345 			wattr_off(view->window,
3346 			    COLOR_PAIR(tc->colorpair), NULL);
3347 		if (width <= view->ncols - 1)
3348 			waddch(view->window, '\n');
3349 		nprinted++;
3350 	}
3351 	free(line);
3352 	if (nprinted >= 1)
3353 		s->last_displayed_line = s->first_displayed_line +
3354 		    (nprinted - 1);
3355 	else
3356 		s->last_displayed_line = s->first_displayed_line;
3357 
3358 	view_vborder(view);
3359 
3360 	if (s->eof) {
3361 		while (nprinted < view->nlines) {
3362 			waddch(view->window, '\n');
3363 			nprinted++;
3364 		}
3365 
3366 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3367 		    view->ncols, 0, 0);
3368 		if (err) {
3369 			return err;
3370 		}
3371 
3372 		wstandout(view->window);
3373 		waddwstr(view->window, wline);
3374 		free(wline);
3375 		wline = NULL;
3376 		wstandend(view->window);
3377 	}
3378 
3379 	return NULL;
3380 }
3381 
3382 static char *
3383 get_datestr(time_t *time, char *datebuf)
3384 {
3385 	struct tm mytm, *tm;
3386 	char *p, *s;
3387 
3388 	tm = gmtime_r(time, &mytm);
3389 	if (tm == NULL)
3390 		return NULL;
3391 	s = asctime_r(tm, datebuf);
3392 	if (s == NULL)
3393 		return NULL;
3394 	p = strchr(s, '\n');
3395 	if (p)
3396 		*p = '\0';
3397 	return s;
3398 }
3399 
3400 static const struct got_error *
3401 get_changed_paths(struct got_pathlist_head *paths,
3402     struct got_commit_object *commit, struct got_repository *repo)
3403 {
3404 	const struct got_error *err = NULL;
3405 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
3406 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
3407 	struct got_object_qid *qid;
3408 
3409 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3410 	if (qid != NULL) {
3411 		struct got_commit_object *pcommit;
3412 		err = got_object_open_as_commit(&pcommit, repo,
3413 		    &qid->id);
3414 		if (err)
3415 			return err;
3416 
3417 		tree_id1 = got_object_id_dup(
3418 		    got_object_commit_get_tree_id(pcommit));
3419 		if (tree_id1 == NULL) {
3420 			got_object_commit_close(pcommit);
3421 			return got_error_from_errno("got_object_id_dup");
3422 		}
3423 		got_object_commit_close(pcommit);
3424 
3425 	}
3426 
3427 	if (tree_id1) {
3428 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
3429 		if (err)
3430 			goto done;
3431 	}
3432 
3433 	tree_id2 = got_object_commit_get_tree_id(commit);
3434 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
3435 	if (err)
3436 		goto done;
3437 
3438 	err = got_diff_tree(tree1, tree2, NULL, NULL, "", "", repo,
3439 	    got_diff_tree_collect_changed_paths, paths, 0);
3440 done:
3441 	if (tree1)
3442 		got_object_tree_close(tree1);
3443 	if (tree2)
3444 		got_object_tree_close(tree2);
3445 	free(tree_id1);
3446 	return err;
3447 }
3448 
3449 static const struct got_error *
3450 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
3451 {
3452 	off_t *p;
3453 
3454 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
3455 	if (p == NULL)
3456 		return got_error_from_errno("reallocarray");
3457 	*line_offsets = p;
3458 	(*line_offsets)[*nlines] = off;
3459 	(*nlines)++;
3460 	return NULL;
3461 }
3462 
3463 static const struct got_error *
3464 write_commit_info(off_t **line_offsets, size_t *nlines,
3465     struct got_object_id *commit_id, struct got_reflist_head *refs,
3466     struct got_repository *repo, FILE *outfile)
3467 {
3468 	const struct got_error *err = NULL;
3469 	char datebuf[26], *datestr;
3470 	struct got_commit_object *commit;
3471 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
3472 	time_t committer_time;
3473 	const char *author, *committer;
3474 	char *refs_str = NULL;
3475 	struct got_pathlist_head changed_paths;
3476 	struct got_pathlist_entry *pe;
3477 	off_t outoff = 0;
3478 	int n;
3479 
3480 	TAILQ_INIT(&changed_paths);
3481 
3482 	if (refs) {
3483 		err = build_refs_str(&refs_str, refs, commit_id, repo);
3484 		if (err)
3485 			return err;
3486 	}
3487 
3488 	err = got_object_open_as_commit(&commit, repo, commit_id);
3489 	if (err)
3490 		return err;
3491 
3492 	err = got_object_id_str(&id_str, commit_id);
3493 	if (err) {
3494 		err = got_error_from_errno("got_object_id_str");
3495 		goto done;
3496 	}
3497 
3498 	err = add_line_offset(line_offsets, nlines, 0);
3499 	if (err)
3500 		goto done;
3501 
3502 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
3503 	    refs_str ? refs_str : "", refs_str ? ")" : "");
3504 	if (n < 0) {
3505 		err = got_error_from_errno("fprintf");
3506 		goto done;
3507 	}
3508 	outoff += n;
3509 	err = add_line_offset(line_offsets, nlines, outoff);
3510 	if (err)
3511 		goto done;
3512 
3513 	n = fprintf(outfile, "from: %s\n",
3514 	    got_object_commit_get_author(commit));
3515 	if (n < 0) {
3516 		err = got_error_from_errno("fprintf");
3517 		goto done;
3518 	}
3519 	outoff += n;
3520 	err = add_line_offset(line_offsets, nlines, outoff);
3521 	if (err)
3522 		goto done;
3523 
3524 	committer_time = got_object_commit_get_committer_time(commit);
3525 	datestr = get_datestr(&committer_time, datebuf);
3526 	if (datestr) {
3527 		n = fprintf(outfile, "date: %s UTC\n", datestr);
3528 		if (n < 0) {
3529 			err = got_error_from_errno("fprintf");
3530 			goto done;
3531 		}
3532 		outoff += n;
3533 		err = add_line_offset(line_offsets, nlines, outoff);
3534 		if (err)
3535 			goto done;
3536 	}
3537 	author = got_object_commit_get_author(commit);
3538 	committer = got_object_commit_get_committer(commit);
3539 	if (strcmp(author, committer) != 0) {
3540 		n = fprintf(outfile, "via: %s\n", committer);
3541 		if (n < 0) {
3542 			err = got_error_from_errno("fprintf");
3543 			goto done;
3544 		}
3545 		outoff += n;
3546 		err = add_line_offset(line_offsets, nlines, outoff);
3547 		if (err)
3548 			goto done;
3549 	}
3550 	if (got_object_commit_get_nparents(commit) > 1) {
3551 		const struct got_object_id_queue *parent_ids;
3552 		struct got_object_qid *qid;
3553 		int pn = 1;
3554 		parent_ids = got_object_commit_get_parent_ids(commit);
3555 		STAILQ_FOREACH(qid, parent_ids, entry) {
3556 			err = got_object_id_str(&id_str, &qid->id);
3557 			if (err)
3558 				goto done;
3559 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
3560 			if (n < 0) {
3561 				err = got_error_from_errno("fprintf");
3562 				goto done;
3563 			}
3564 			outoff += n;
3565 			err = add_line_offset(line_offsets, nlines, outoff);
3566 			if (err)
3567 				goto done;
3568 			free(id_str);
3569 			id_str = NULL;
3570 		}
3571 	}
3572 
3573 	err = got_object_commit_get_logmsg(&logmsg, commit);
3574 	if (err)
3575 		goto done;
3576 	s = logmsg;
3577 	while ((line = strsep(&s, "\n")) != NULL) {
3578 		n = fprintf(outfile, "%s\n", line);
3579 		if (n < 0) {
3580 			err = got_error_from_errno("fprintf");
3581 			goto done;
3582 		}
3583 		outoff += n;
3584 		err = add_line_offset(line_offsets, nlines, outoff);
3585 		if (err)
3586 			goto done;
3587 	}
3588 
3589 	err = get_changed_paths(&changed_paths, commit, repo);
3590 	if (err)
3591 		goto done;
3592 	TAILQ_FOREACH(pe, &changed_paths, entry) {
3593 		struct got_diff_changed_path *cp = pe->data;
3594 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
3595 		if (n < 0) {
3596 			err = got_error_from_errno("fprintf");
3597 			goto done;
3598 		}
3599 		outoff += n;
3600 		err = add_line_offset(line_offsets, nlines, outoff);
3601 		if (err)
3602 			goto done;
3603 		free((char *)pe->path);
3604 		free(pe->data);
3605 	}
3606 
3607 	fputc('\n', outfile);
3608 	outoff++;
3609 	err = add_line_offset(line_offsets, nlines, outoff);
3610 done:
3611 	got_pathlist_free(&changed_paths);
3612 	free(id_str);
3613 	free(logmsg);
3614 	free(refs_str);
3615 	got_object_commit_close(commit);
3616 	if (err) {
3617 		free(*line_offsets);
3618 		*line_offsets = NULL;
3619 		*nlines = 0;
3620 	}
3621 	return err;
3622 }
3623 
3624 static const struct got_error *
3625 create_diff(struct tog_diff_view_state *s)
3626 {
3627 	const struct got_error *err = NULL;
3628 	FILE *f = NULL;
3629 	int obj_type;
3630 
3631 	free(s->line_offsets);
3632 	s->line_offsets = malloc(sizeof(off_t));
3633 	if (s->line_offsets == NULL)
3634 		return got_error_from_errno("malloc");
3635 	s->nlines = 0;
3636 
3637 	f = got_opentemp();
3638 	if (f == NULL) {
3639 		err = got_error_from_errno("got_opentemp");
3640 		goto done;
3641 	}
3642 	if (s->f && fclose(s->f) == EOF) {
3643 		err = got_error_from_errno("fclose");
3644 		goto done;
3645 	}
3646 	s->f = f;
3647 
3648 	if (s->id1)
3649 		err = got_object_get_type(&obj_type, s->repo, s->id1);
3650 	else
3651 		err = got_object_get_type(&obj_type, s->repo, s->id2);
3652 	if (err)
3653 		goto done;
3654 
3655 	switch (obj_type) {
3656 	case GOT_OBJ_TYPE_BLOB:
3657 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
3658 		    s->f1, s->f2, s->id1, s->id2, s->label1, s->label2,
3659 		    s->diff_context, s->ignore_whitespace, s->force_text_diff,
3660 		    s->repo, s->f);
3661 		break;
3662 	case GOT_OBJ_TYPE_TREE:
3663 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
3664 		    s->f1, s->f2, s->id1, s->id2, NULL, "", "", s->diff_context,
3665 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
3666 		break;
3667 	case GOT_OBJ_TYPE_COMMIT: {
3668 		const struct got_object_id_queue *parent_ids;
3669 		struct got_object_qid *pid;
3670 		struct got_commit_object *commit2;
3671 		struct got_reflist_head *refs;
3672 
3673 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
3674 		if (err)
3675 			goto done;
3676 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
3677 		/* Show commit info if we're diffing to a parent/root commit. */
3678 		if (s->id1 == NULL) {
3679 			err = write_commit_info(&s->line_offsets, &s->nlines,
3680 			    s->id2, refs, s->repo, s->f);
3681 			if (err)
3682 				goto done;
3683 		} else {
3684 			parent_ids = got_object_commit_get_parent_ids(commit2);
3685 			STAILQ_FOREACH(pid, parent_ids, entry) {
3686 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
3687 					err = write_commit_info(
3688 					    &s->line_offsets, &s->nlines,
3689 					    s->id2, refs, s->repo, s->f);
3690 					if (err)
3691 						goto done;
3692 					break;
3693 				}
3694 			}
3695 		}
3696 		got_object_commit_close(commit2);
3697 
3698 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
3699 		    s->f1, s->f2, s->id1, s->id2, NULL, s->diff_context,
3700 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
3701 		break;
3702 	}
3703 	default:
3704 		err = got_error(GOT_ERR_OBJ_TYPE);
3705 		break;
3706 	}
3707 	if (err)
3708 		goto done;
3709 done:
3710 	if (s->f && fflush(s->f) != 0 && err == NULL)
3711 		err = got_error_from_errno("fflush");
3712 	return err;
3713 }
3714 
3715 static void
3716 diff_view_indicate_progress(struct tog_view *view)
3717 {
3718 	mvwaddstr(view->window, 0, 0, "diffing...");
3719 	update_panels();
3720 	doupdate();
3721 }
3722 
3723 static const struct got_error *
3724 search_start_diff_view(struct tog_view *view)
3725 {
3726 	struct tog_diff_view_state *s = &view->state.diff;
3727 
3728 	s->matched_line = 0;
3729 	return NULL;
3730 }
3731 
3732 static const struct got_error *
3733 search_next_diff_view(struct tog_view *view)
3734 {
3735 	struct tog_diff_view_state *s = &view->state.diff;
3736 	const struct got_error *err = NULL;
3737 	int lineno;
3738 	char *line = NULL;
3739 	size_t linesize = 0;
3740 	ssize_t linelen;
3741 
3742 	if (!view->searching) {
3743 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
3744 		return NULL;
3745 	}
3746 
3747 	if (s->matched_line) {
3748 		if (view->searching == TOG_SEARCH_FORWARD)
3749 			lineno = s->matched_line + 1;
3750 		else
3751 			lineno = s->matched_line - 1;
3752 	} else
3753 		lineno = s->first_displayed_line;
3754 
3755 	while (1) {
3756 		off_t offset;
3757 
3758 		if (lineno <= 0 || lineno > s->nlines) {
3759 			if (s->matched_line == 0) {
3760 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3761 				break;
3762 			}
3763 
3764 			if (view->searching == TOG_SEARCH_FORWARD)
3765 				lineno = 1;
3766 			else
3767 				lineno = s->nlines;
3768 		}
3769 
3770 		offset = s->line_offsets[lineno - 1];
3771 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
3772 			free(line);
3773 			return got_error_from_errno("fseeko");
3774 		}
3775 		linelen = getline(&line, &linesize, s->f);
3776 		if (linelen != -1) {
3777 			char *exstr;
3778 			err = expand_tab(&exstr, line);
3779 			if (err)
3780 				break;
3781 			if (match_line(exstr, &view->regex, 1,
3782 			    &view->regmatch)) {
3783 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3784 				s->matched_line = lineno;
3785 				free(exstr);
3786 				break;
3787 			}
3788 			free(exstr);
3789 		}
3790 		if (view->searching == TOG_SEARCH_FORWARD)
3791 			lineno++;
3792 		else
3793 			lineno--;
3794 	}
3795 	free(line);
3796 
3797 	if (s->matched_line) {
3798 		s->first_displayed_line = s->matched_line;
3799 		s->selected_line = 1;
3800 	}
3801 
3802 	return err;
3803 }
3804 
3805 static const struct got_error *
3806 close_diff_view(struct tog_view *view)
3807 {
3808 	const struct got_error *err = NULL;
3809 	struct tog_diff_view_state *s = &view->state.diff;
3810 
3811 	free(s->id1);
3812 	s->id1 = NULL;
3813 	free(s->id2);
3814 	s->id2 = NULL;
3815 	if (s->f && fclose(s->f) == EOF)
3816 		err = got_error_from_errno("fclose");
3817 	s->f = NULL;
3818 	if (s->f1 && fclose(s->f1) == EOF)
3819 		err = got_error_from_errno("fclose");
3820 	s->f1 = NULL;
3821 	if (s->f2 && fclose(s->f2) == EOF)
3822 		err = got_error_from_errno("fclose");
3823 	s->f2 = NULL;
3824 	free_colors(&s->colors);
3825 	free(s->line_offsets);
3826 	s->line_offsets = NULL;
3827 	s->nlines = 0;
3828 	return err;
3829 }
3830 
3831 static const struct got_error *
3832 open_diff_view(struct tog_view *view, struct got_object_id *id1,
3833     struct got_object_id *id2, const char *label1, const char *label2,
3834     int diff_context, int ignore_whitespace, int force_text_diff,
3835     struct tog_view *log_view, struct got_repository *repo)
3836 {
3837 	const struct got_error *err;
3838 	struct tog_diff_view_state *s = &view->state.diff;
3839 
3840 	memset(s, 0, sizeof(*s));
3841 
3842 	if (id1 != NULL && id2 != NULL) {
3843 	    int type1, type2;
3844 	    err = got_object_get_type(&type1, repo, id1);
3845 	    if (err)
3846 		return err;
3847 	    err = got_object_get_type(&type2, repo, id2);
3848 	    if (err)
3849 		return err;
3850 
3851 	    if (type1 != type2)
3852 		return got_error(GOT_ERR_OBJ_TYPE);
3853 	}
3854 	s->first_displayed_line = 1;
3855 	s->last_displayed_line = view->nlines;
3856 	s->selected_line = 1;
3857 	s->repo = repo;
3858 	s->id1 = id1;
3859 	s->id2 = id2;
3860 	s->label1 = label1;
3861 	s->label2 = label2;
3862 
3863 	if (id1) {
3864 		s->id1 = got_object_id_dup(id1);
3865 		if (s->id1 == NULL)
3866 			return got_error_from_errno("got_object_id_dup");
3867 	} else
3868 		s->id1 = NULL;
3869 
3870 	s->id2 = got_object_id_dup(id2);
3871 	if (s->id2 == NULL) {
3872 		err = got_error_from_errno("got_object_id_dup");
3873 		goto done;
3874 	}
3875 
3876 	s->f1 = got_opentemp();
3877 	if (s->f1 == NULL) {
3878 		err = got_error_from_errno("got_opentemp");
3879 		goto done;
3880 	}
3881 
3882 	s->f2 = got_opentemp();
3883 	if (s->f2 == NULL) {
3884 		err = got_error_from_errno("got_opentemp");
3885 		goto done;
3886 	}
3887 
3888 	s->first_displayed_line = 1;
3889 	s->last_displayed_line = view->nlines;
3890 	s->diff_context = diff_context;
3891 	s->ignore_whitespace = ignore_whitespace;
3892 	s->force_text_diff = force_text_diff;
3893 	s->log_view = log_view;
3894 	s->repo = repo;
3895 
3896 	STAILQ_INIT(&s->colors);
3897 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3898 		err = add_color(&s->colors,
3899 		    "^-", TOG_COLOR_DIFF_MINUS,
3900 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
3901 		if (err)
3902 			goto done;
3903 		err = add_color(&s->colors, "^\\+",
3904 		    TOG_COLOR_DIFF_PLUS,
3905 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
3906 		if (err)
3907 			goto done;
3908 		err = add_color(&s->colors,
3909 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
3910 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
3911 		if (err)
3912 			goto done;
3913 
3914 		err = add_color(&s->colors,
3915 		    "^(commit [0-9a-f]|parent [0-9]|(blob|file) [-+] |"
3916 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
3917 		    get_color_value("TOG_COLOR_DIFF_META"));
3918 		if (err)
3919 			goto done;
3920 
3921 		err = add_color(&s->colors,
3922 		    "^(from|via): ", TOG_COLOR_AUTHOR,
3923 		    get_color_value("TOG_COLOR_AUTHOR"));
3924 		if (err)
3925 			goto done;
3926 
3927 		err = add_color(&s->colors,
3928 		    "^date: ", TOG_COLOR_DATE,
3929 		    get_color_value("TOG_COLOR_DATE"));
3930 		if (err)
3931 			goto done;
3932 	}
3933 
3934 	if (log_view && view_is_splitscreen(view))
3935 		show_log_view(log_view); /* draw vborder */
3936 	diff_view_indicate_progress(view);
3937 
3938 	err = create_diff(s);
3939 
3940 	view->show = show_diff_view;
3941 	view->input = input_diff_view;
3942 	view->close = close_diff_view;
3943 	view->search_start = search_start_diff_view;
3944 	view->search_next = search_next_diff_view;
3945 done:
3946 	if (err)
3947 		close_diff_view(view);
3948 	return err;
3949 }
3950 
3951 static const struct got_error *
3952 show_diff_view(struct tog_view *view)
3953 {
3954 	const struct got_error *err;
3955 	struct tog_diff_view_state *s = &view->state.diff;
3956 	char *id_str1 = NULL, *id_str2, *header;
3957 	const char *label1, *label2;
3958 
3959 	if (s->id1) {
3960 		err = got_object_id_str(&id_str1, s->id1);
3961 		if (err)
3962 			return err;
3963 		label1 = s->label1 ? : id_str1;
3964 	} else
3965 		label1 = "/dev/null";
3966 
3967 	err = got_object_id_str(&id_str2, s->id2);
3968 	if (err)
3969 		return err;
3970 	label2 = s->label2 ? : id_str2;
3971 
3972 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
3973 		err = got_error_from_errno("asprintf");
3974 		free(id_str1);
3975 		free(id_str2);
3976 		return err;
3977 	}
3978 	free(id_str1);
3979 	free(id_str2);
3980 
3981 	err = draw_file(view, header);
3982 	free(header);
3983 	return err;
3984 }
3985 
3986 static const struct got_error *
3987 set_selected_commit(struct tog_diff_view_state *s,
3988     struct commit_queue_entry *entry)
3989 {
3990 	const struct got_error *err;
3991 	const struct got_object_id_queue *parent_ids;
3992 	struct got_commit_object *selected_commit;
3993 	struct got_object_qid *pid;
3994 
3995 	free(s->id2);
3996 	s->id2 = got_object_id_dup(entry->id);
3997 	if (s->id2 == NULL)
3998 		return got_error_from_errno("got_object_id_dup");
3999 
4000 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4001 	if (err)
4002 		return err;
4003 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4004 	free(s->id1);
4005 	pid = STAILQ_FIRST(parent_ids);
4006 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4007 	got_object_commit_close(selected_commit);
4008 	return NULL;
4009 }
4010 
4011 static const struct got_error *
4012 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4013 {
4014 	const struct got_error *err = NULL;
4015 	struct tog_diff_view_state *s = &view->state.diff;
4016 	struct tog_log_view_state *ls;
4017 	struct commit_queue_entry *old_selected_entry;
4018 	char *line = NULL;
4019 	size_t linesize = 0;
4020 	ssize_t linelen;
4021 	int i, nscroll = view->nlines - 1;
4022 
4023 	switch (ch) {
4024 	case '0':
4025 		view->x = 0;
4026 		break;
4027 	case '$':
4028 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4029 		break;
4030 	case KEY_RIGHT:
4031 	case 'l':
4032 		if (view->x + view->ncols / 3 < view->maxx)
4033 			view->x += 2;  /* move two columns right */
4034 		break;
4035 	case KEY_LEFT:
4036 	case 'h':
4037 		view->x -= MIN(view->x, 2);  /* move two columns back */
4038 		break;
4039 	case 'a':
4040 	case 'w':
4041 		if (ch == 'a')
4042 			s->force_text_diff = !s->force_text_diff;
4043 		if (ch == 'w')
4044 			s->ignore_whitespace = !s->ignore_whitespace;
4045 		wclear(view->window);
4046 		s->first_displayed_line = 1;
4047 		s->last_displayed_line = view->nlines;
4048 		s->matched_line = 0;
4049 		diff_view_indicate_progress(view);
4050 		err = create_diff(s);
4051 		break;
4052 	case 'g':
4053 	case KEY_HOME:
4054 		s->first_displayed_line = 1;
4055 		break;
4056 	case 'G':
4057 	case KEY_END:
4058 		if (s->eof)
4059 			break;
4060 
4061 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4062 		s->eof = 1;
4063 		break;
4064 	case 'k':
4065 	case KEY_UP:
4066 	case CTRL('p'):
4067 		if (s->first_displayed_line > 1)
4068 			s->first_displayed_line--;
4069 		break;
4070 	case CTRL('u'):
4071 	case 'u':
4072 		nscroll /= 2;
4073 		/* FALL THROUGH */
4074 	case KEY_PPAGE:
4075 	case CTRL('b'):
4076 	case 'b':
4077 		if (s->first_displayed_line == 1)
4078 			break;
4079 		i = 0;
4080 		while (i++ < nscroll && s->first_displayed_line > 1)
4081 			s->first_displayed_line--;
4082 		break;
4083 	case 'j':
4084 	case KEY_DOWN:
4085 	case CTRL('n'):
4086 		if (!s->eof)
4087 			s->first_displayed_line++;
4088 		break;
4089 	case CTRL('d'):
4090 	case 'd':
4091 		nscroll /= 2;
4092 		/* FALL THROUGH */
4093 	case KEY_NPAGE:
4094 	case CTRL('f'):
4095 	case 'f':
4096 	case ' ':
4097 		if (s->eof)
4098 			break;
4099 		i = 0;
4100 		while (!s->eof && i++ < nscroll) {
4101 			linelen = getline(&line, &linesize, s->f);
4102 			s->first_displayed_line++;
4103 			if (linelen == -1) {
4104 				if (feof(s->f)) {
4105 					s->eof = 1;
4106 				} else
4107 					err = got_ferror(s->f, GOT_ERR_IO);
4108 				break;
4109 			}
4110 		}
4111 		free(line);
4112 		break;
4113 	case '[':
4114 		if (s->diff_context > 0) {
4115 			s->diff_context--;
4116 			s->matched_line = 0;
4117 			diff_view_indicate_progress(view);
4118 			err = create_diff(s);
4119 			if (s->first_displayed_line + view->nlines - 1 >
4120 			    s->nlines) {
4121 				s->first_displayed_line = 1;
4122 				s->last_displayed_line = view->nlines;
4123 			}
4124 		}
4125 		break;
4126 	case ']':
4127 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4128 			s->diff_context++;
4129 			s->matched_line = 0;
4130 			diff_view_indicate_progress(view);
4131 			err = create_diff(s);
4132 		}
4133 		break;
4134 	case '<':
4135 	case ',':
4136 		if (s->log_view == NULL)
4137 			break;
4138 		ls = &s->log_view->state.log;
4139 		old_selected_entry = ls->selected_entry;
4140 
4141 		err = input_log_view(NULL, s->log_view, KEY_UP);
4142 		if (err)
4143 			break;
4144 
4145 		if (old_selected_entry == ls->selected_entry)
4146 			break;
4147 
4148 		err = set_selected_commit(s, ls->selected_entry);
4149 		if (err)
4150 			break;
4151 
4152 		s->first_displayed_line = 1;
4153 		s->last_displayed_line = view->nlines;
4154 		s->matched_line = 0;
4155 		view->x = 0;
4156 
4157 		diff_view_indicate_progress(view);
4158 		err = create_diff(s);
4159 		break;
4160 	case '>':
4161 	case '.':
4162 		if (s->log_view == NULL)
4163 			break;
4164 		ls = &s->log_view->state.log;
4165 		old_selected_entry = ls->selected_entry;
4166 
4167 		err = input_log_view(NULL, s->log_view, KEY_DOWN);
4168 		if (err)
4169 			break;
4170 
4171 		if (old_selected_entry == ls->selected_entry)
4172 			break;
4173 
4174 		err = set_selected_commit(s, ls->selected_entry);
4175 		if (err)
4176 			break;
4177 
4178 		s->first_displayed_line = 1;
4179 		s->last_displayed_line = view->nlines;
4180 		s->matched_line = 0;
4181 		view->x = 0;
4182 
4183 		diff_view_indicate_progress(view);
4184 		err = create_diff(s);
4185 		break;
4186 	default:
4187 		break;
4188 	}
4189 
4190 	return err;
4191 }
4192 
4193 static const struct got_error *
4194 cmd_diff(int argc, char *argv[])
4195 {
4196 	const struct got_error *error = NULL;
4197 	struct got_repository *repo = NULL;
4198 	struct got_worktree *worktree = NULL;
4199 	struct got_object_id *id1 = NULL, *id2 = NULL;
4200 	char *repo_path = NULL, *cwd = NULL;
4201 	char *id_str1 = NULL, *id_str2 = NULL;
4202 	char *label1 = NULL, *label2 = NULL;
4203 	int diff_context = 3, ignore_whitespace = 0;
4204 	int ch, force_text_diff = 0;
4205 	const char *errstr;
4206 	struct tog_view *view;
4207 	int *pack_fds = NULL;
4208 
4209 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4210 		switch (ch) {
4211 		case 'a':
4212 			force_text_diff = 1;
4213 			break;
4214 		case 'C':
4215 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4216 			    &errstr);
4217 			if (errstr != NULL)
4218 				errx(1, "number of context lines is %s: %s",
4219 				    errstr, errstr);
4220 			break;
4221 		case 'r':
4222 			repo_path = realpath(optarg, NULL);
4223 			if (repo_path == NULL)
4224 				return got_error_from_errno2("realpath",
4225 				    optarg);
4226 			got_path_strip_trailing_slashes(repo_path);
4227 			break;
4228 		case 'w':
4229 			ignore_whitespace = 1;
4230 			break;
4231 		default:
4232 			usage_diff();
4233 			/* NOTREACHED */
4234 		}
4235 	}
4236 
4237 	argc -= optind;
4238 	argv += optind;
4239 
4240 	if (argc == 0) {
4241 		usage_diff(); /* TODO show local worktree changes */
4242 	} else if (argc == 2) {
4243 		id_str1 = argv[0];
4244 		id_str2 = argv[1];
4245 	} else
4246 		usage_diff();
4247 
4248 	error = got_repo_pack_fds_open(&pack_fds);
4249 	if (error)
4250 		goto done;
4251 
4252 	if (repo_path == NULL) {
4253 		cwd = getcwd(NULL, 0);
4254 		if (cwd == NULL)
4255 			return got_error_from_errno("getcwd");
4256 		error = got_worktree_open(&worktree, cwd);
4257 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4258 			goto done;
4259 		if (worktree)
4260 			repo_path =
4261 			    strdup(got_worktree_get_repo_path(worktree));
4262 		else
4263 			repo_path = strdup(cwd);
4264 		if (repo_path == NULL) {
4265 			error = got_error_from_errno("strdup");
4266 			goto done;
4267 		}
4268 	}
4269 
4270 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4271 	if (error)
4272 		goto done;
4273 
4274 	init_curses();
4275 
4276 	error = apply_unveil(got_repo_get_path(repo), NULL);
4277 	if (error)
4278 		goto done;
4279 
4280 	error = tog_load_refs(repo, 0);
4281 	if (error)
4282 		goto done;
4283 
4284 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4285 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4286 	if (error)
4287 		goto done;
4288 
4289 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4290 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4291 	if (error)
4292 		goto done;
4293 
4294 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4295 	if (view == NULL) {
4296 		error = got_error_from_errno("view_open");
4297 		goto done;
4298 	}
4299 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4300 	    ignore_whitespace, force_text_diff, NULL,  repo);
4301 	if (error)
4302 		goto done;
4303 	error = view_loop(view);
4304 done:
4305 	free(label1);
4306 	free(label2);
4307 	free(repo_path);
4308 	free(cwd);
4309 	if (repo) {
4310 		const struct got_error *close_err = got_repo_close(repo);
4311 		if (error == NULL)
4312 			error = close_err;
4313 	}
4314 	if (worktree)
4315 		got_worktree_close(worktree);
4316 	if (pack_fds) {
4317 		const struct got_error *pack_err =
4318 		    got_repo_pack_fds_close(pack_fds);
4319 		if (error == NULL)
4320 			error = pack_err;
4321 	}
4322 	tog_free_refs();
4323 	return error;
4324 }
4325 
4326 __dead static void
4327 usage_blame(void)
4328 {
4329 	endwin();
4330 	fprintf(stderr,
4331 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
4332 	    getprogname());
4333 	exit(1);
4334 }
4335 
4336 struct tog_blame_line {
4337 	int annotated;
4338 	struct got_object_id *id;
4339 };
4340 
4341 static const struct got_error *
4342 draw_blame(struct tog_view *view)
4343 {
4344 	struct tog_blame_view_state *s = &view->state.blame;
4345 	struct tog_blame *blame = &s->blame;
4346 	regmatch_t *regmatch = &view->regmatch;
4347 	const struct got_error *err;
4348 	int lineno = 0, nprinted = 0;
4349 	char *line = NULL;
4350 	size_t linesize = 0;
4351 	ssize_t linelen;
4352 	wchar_t *wline;
4353 	int width;
4354 	struct tog_blame_line *blame_line;
4355 	struct got_object_id *prev_id = NULL;
4356 	char *id_str;
4357 	struct tog_color *tc;
4358 
4359 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
4360 	if (err)
4361 		return err;
4362 
4363 	rewind(blame->f);
4364 	werase(view->window);
4365 
4366 	if (asprintf(&line, "commit %s", id_str) == -1) {
4367 		err = got_error_from_errno("asprintf");
4368 		free(id_str);
4369 		return err;
4370 	}
4371 
4372 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4373 	free(line);
4374 	line = NULL;
4375 	if (err)
4376 		return err;
4377 	if (view_needs_focus_indication(view))
4378 		wstandout(view->window);
4379 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4380 	if (tc)
4381 		wattr_on(view->window,
4382 		    COLOR_PAIR(tc->colorpair), NULL);
4383 	waddwstr(view->window, wline);
4384 	if (tc)
4385 		wattr_off(view->window,
4386 		    COLOR_PAIR(tc->colorpair), NULL);
4387 	if (view_needs_focus_indication(view))
4388 		wstandend(view->window);
4389 	free(wline);
4390 	wline = NULL;
4391 	if (width < view->ncols - 1)
4392 		waddch(view->window, '\n');
4393 
4394 	if (asprintf(&line, "[%d/%d] %s%s",
4395 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
4396 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
4397 		free(id_str);
4398 		return got_error_from_errno("asprintf");
4399 	}
4400 	free(id_str);
4401 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4402 	free(line);
4403 	line = NULL;
4404 	if (err)
4405 		return err;
4406 	waddwstr(view->window, wline);
4407 	free(wline);
4408 	wline = NULL;
4409 	if (width < view->ncols - 1)
4410 		waddch(view->window, '\n');
4411 
4412 	s->eof = 0;
4413 	view->maxx = 0;
4414 	while (nprinted < view->nlines - 2) {
4415 		linelen = getline(&line, &linesize, blame->f);
4416 		if (linelen == -1) {
4417 			if (feof(blame->f)) {
4418 				s->eof = 1;
4419 				break;
4420 			}
4421 			free(line);
4422 			return got_ferror(blame->f, GOT_ERR_IO);
4423 		}
4424 		if (++lineno < s->first_displayed_line)
4425 			continue;
4426 
4427 		/* Set view->maxx based on full line length. */
4428 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
4429 		if (err) {
4430 			free(line);
4431 			return err;
4432 		}
4433 		free(wline);
4434 		wline = NULL;
4435 		view->maxx = MAX(view->maxx, width);
4436 
4437 		if (view->focussed && nprinted == s->selected_line - 1)
4438 			wstandout(view->window);
4439 
4440 		if (blame->nlines > 0) {
4441 			blame_line = &blame->lines[lineno - 1];
4442 			if (blame_line->annotated && prev_id &&
4443 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
4444 			    !(view->focussed &&
4445 			    nprinted == s->selected_line - 1)) {
4446 				waddstr(view->window, "        ");
4447 			} else if (blame_line->annotated) {
4448 				char *id_str;
4449 				err = got_object_id_str(&id_str,
4450 				    blame_line->id);
4451 				if (err) {
4452 					free(line);
4453 					return err;
4454 				}
4455 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4456 				if (tc)
4457 					wattr_on(view->window,
4458 					    COLOR_PAIR(tc->colorpair), NULL);
4459 				wprintw(view->window, "%.8s", id_str);
4460 				if (tc)
4461 					wattr_off(view->window,
4462 					    COLOR_PAIR(tc->colorpair), NULL);
4463 				free(id_str);
4464 				prev_id = blame_line->id;
4465 			} else {
4466 				waddstr(view->window, "........");
4467 				prev_id = NULL;
4468 			}
4469 		} else {
4470 			waddstr(view->window, "........");
4471 			prev_id = NULL;
4472 		}
4473 
4474 		if (view->focussed && nprinted == s->selected_line - 1)
4475 			wstandend(view->window);
4476 		waddstr(view->window, " ");
4477 
4478 		if (view->ncols <= 9) {
4479 			width = 9;
4480 		} else if (s->first_displayed_line + nprinted ==
4481 		    s->matched_line &&
4482 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4483 			err = add_matched_line(&width, line, view->ncols - 9, 9,
4484 			    view->window, view->x, regmatch);
4485 			if (err) {
4486 				free(line);
4487 				return err;
4488 			}
4489 			width += 9;
4490 		} else {
4491 			int skip;
4492 			err = format_line(&wline, &width, &skip, line,
4493 			    view->x, view->ncols - 9, 9, 1);
4494 			if (err) {
4495 				free(line);
4496 				return err;
4497 			}
4498 			waddwstr(view->window, &wline[skip]);
4499 			width += 9;
4500 			free(wline);
4501 			wline = NULL;
4502 		}
4503 
4504 		if (width <= view->ncols - 1)
4505 			waddch(view->window, '\n');
4506 		if (++nprinted == 1)
4507 			s->first_displayed_line = lineno;
4508 	}
4509 	free(line);
4510 	s->last_displayed_line = lineno;
4511 
4512 	view_vborder(view);
4513 
4514 	return NULL;
4515 }
4516 
4517 static const struct got_error *
4518 blame_cb(void *arg, int nlines, int lineno,
4519     struct got_commit_object *commit, struct got_object_id *id)
4520 {
4521 	const struct got_error *err = NULL;
4522 	struct tog_blame_cb_args *a = arg;
4523 	struct tog_blame_line *line;
4524 	int errcode;
4525 
4526 	if (nlines != a->nlines ||
4527 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
4528 		return got_error(GOT_ERR_RANGE);
4529 
4530 	errcode = pthread_mutex_lock(&tog_mutex);
4531 	if (errcode)
4532 		return got_error_set_errno(errcode, "pthread_mutex_lock");
4533 
4534 	if (*a->quit) {	/* user has quit the blame view */
4535 		err = got_error(GOT_ERR_ITER_COMPLETED);
4536 		goto done;
4537 	}
4538 
4539 	if (lineno == -1)
4540 		goto done; /* no change in this commit */
4541 
4542 	line = &a->lines[lineno - 1];
4543 	if (line->annotated)
4544 		goto done;
4545 
4546 	line->id = got_object_id_dup(id);
4547 	if (line->id == NULL) {
4548 		err = got_error_from_errno("got_object_id_dup");
4549 		goto done;
4550 	}
4551 	line->annotated = 1;
4552 done:
4553 	errcode = pthread_mutex_unlock(&tog_mutex);
4554 	if (errcode)
4555 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4556 	return err;
4557 }
4558 
4559 static void *
4560 blame_thread(void *arg)
4561 {
4562 	const struct got_error *err, *close_err;
4563 	struct tog_blame_thread_args *ta = arg;
4564 	struct tog_blame_cb_args *a = ta->cb_args;
4565 	int errcode;
4566 
4567 	err = block_signals_used_by_main_thread();
4568 	if (err)
4569 		return (void *)err;
4570 
4571 	err = got_blame(ta->path, a->commit_id, ta->repo,
4572 	    blame_cb, ta->cb_args, ta->cancel_cb, ta->cancel_arg);
4573 	if (err && err->code == GOT_ERR_CANCELLED)
4574 		err = NULL;
4575 
4576 	errcode = pthread_mutex_lock(&tog_mutex);
4577 	if (errcode)
4578 		return (void *)got_error_set_errno(errcode,
4579 		    "pthread_mutex_lock");
4580 
4581 	close_err = got_repo_close(ta->repo);
4582 	if (err == NULL)
4583 		err = close_err;
4584 	ta->repo = NULL;
4585 	*ta->complete = 1;
4586 
4587 	errcode = pthread_mutex_unlock(&tog_mutex);
4588 	if (errcode && err == NULL)
4589 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4590 
4591 	return (void *)err;
4592 }
4593 
4594 static struct got_object_id *
4595 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
4596     int first_displayed_line, int selected_line)
4597 {
4598 	struct tog_blame_line *line;
4599 
4600 	if (nlines <= 0)
4601 		return NULL;
4602 
4603 	line = &lines[first_displayed_line - 1 + selected_line - 1];
4604 	if (!line->annotated)
4605 		return NULL;
4606 
4607 	return line->id;
4608 }
4609 
4610 static const struct got_error *
4611 stop_blame(struct tog_blame *blame)
4612 {
4613 	const struct got_error *err = NULL;
4614 	int i;
4615 
4616 	if (blame->thread) {
4617 		int errcode;
4618 		errcode = pthread_mutex_unlock(&tog_mutex);
4619 		if (errcode)
4620 			return got_error_set_errno(errcode,
4621 			    "pthread_mutex_unlock");
4622 		errcode = pthread_join(blame->thread, (void **)&err);
4623 		if (errcode)
4624 			return got_error_set_errno(errcode, "pthread_join");
4625 		errcode = pthread_mutex_lock(&tog_mutex);
4626 		if (errcode)
4627 			return got_error_set_errno(errcode,
4628 			    "pthread_mutex_lock");
4629 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
4630 			err = NULL;
4631 		blame->thread = 0; //NULL;
4632 	}
4633 	if (blame->thread_args.repo) {
4634 		const struct got_error *close_err;
4635 		close_err = got_repo_close(blame->thread_args.repo);
4636 		if (err == NULL)
4637 			err = close_err;
4638 		blame->thread_args.repo = NULL;
4639 	}
4640 	if (blame->f) {
4641 		if (fclose(blame->f) == EOF && err == NULL)
4642 			err = got_error_from_errno("fclose");
4643 		blame->f = NULL;
4644 	}
4645 	if (blame->lines) {
4646 		for (i = 0; i < blame->nlines; i++)
4647 			free(blame->lines[i].id);
4648 		free(blame->lines);
4649 		blame->lines = NULL;
4650 	}
4651 	free(blame->cb_args.commit_id);
4652 	blame->cb_args.commit_id = NULL;
4653 	if (blame->pack_fds) {
4654 		const struct got_error *pack_err =
4655 		    got_repo_pack_fds_close(blame->pack_fds);
4656 		if (err == NULL)
4657 			err = pack_err;
4658 		blame->pack_fds = NULL;
4659 	}
4660 	return err;
4661 }
4662 
4663 static const struct got_error *
4664 cancel_blame_view(void *arg)
4665 {
4666 	const struct got_error *err = NULL;
4667 	int *done = arg;
4668 	int errcode;
4669 
4670 	errcode = pthread_mutex_lock(&tog_mutex);
4671 	if (errcode)
4672 		return got_error_set_errno(errcode,
4673 		    "pthread_mutex_unlock");
4674 
4675 	if (*done)
4676 		err = got_error(GOT_ERR_CANCELLED);
4677 
4678 	errcode = pthread_mutex_unlock(&tog_mutex);
4679 	if (errcode)
4680 		return got_error_set_errno(errcode,
4681 		    "pthread_mutex_lock");
4682 
4683 	return err;
4684 }
4685 
4686 static const struct got_error *
4687 run_blame(struct tog_view *view)
4688 {
4689 	struct tog_blame_view_state *s = &view->state.blame;
4690 	struct tog_blame *blame = &s->blame;
4691 	const struct got_error *err = NULL;
4692 	struct got_commit_object *commit = NULL;
4693 	struct got_blob_object *blob = NULL;
4694 	struct got_repository *thread_repo = NULL;
4695 	struct got_object_id *obj_id = NULL;
4696 	int obj_type;
4697 	int *pack_fds = NULL;
4698 
4699 	err = got_object_open_as_commit(&commit, s->repo,
4700 	    &s->blamed_commit->id);
4701 	if (err)
4702 		return err;
4703 
4704 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
4705 	if (err)
4706 		goto done;
4707 
4708 	err = got_object_get_type(&obj_type, s->repo, obj_id);
4709 	if (err)
4710 		goto done;
4711 
4712 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
4713 		err = got_error(GOT_ERR_OBJ_TYPE);
4714 		goto done;
4715 	}
4716 
4717 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192);
4718 	if (err)
4719 		goto done;
4720 	blame->f = got_opentemp();
4721 	if (blame->f == NULL) {
4722 		err = got_error_from_errno("got_opentemp");
4723 		goto done;
4724 	}
4725 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
4726 	    &blame->line_offsets, blame->f, blob);
4727 	if (err)
4728 		goto done;
4729 	if (blame->nlines == 0) {
4730 		s->blame_complete = 1;
4731 		goto done;
4732 	}
4733 
4734 	/* Don't include \n at EOF in the blame line count. */
4735 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
4736 		blame->nlines--;
4737 
4738 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
4739 	if (blame->lines == NULL) {
4740 		err = got_error_from_errno("calloc");
4741 		goto done;
4742 	}
4743 
4744 	err = got_repo_pack_fds_open(&pack_fds);
4745 	if (err)
4746 		goto done;
4747 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
4748 	    pack_fds);
4749 	if (err)
4750 		goto done;
4751 
4752 	blame->pack_fds = pack_fds;
4753 	blame->cb_args.view = view;
4754 	blame->cb_args.lines = blame->lines;
4755 	blame->cb_args.nlines = blame->nlines;
4756 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
4757 	if (blame->cb_args.commit_id == NULL) {
4758 		err = got_error_from_errno("got_object_id_dup");
4759 		goto done;
4760 	}
4761 	blame->cb_args.quit = &s->done;
4762 
4763 	blame->thread_args.path = s->path;
4764 	blame->thread_args.repo = thread_repo;
4765 	blame->thread_args.cb_args = &blame->cb_args;
4766 	blame->thread_args.complete = &s->blame_complete;
4767 	blame->thread_args.cancel_cb = cancel_blame_view;
4768 	blame->thread_args.cancel_arg = &s->done;
4769 	s->blame_complete = 0;
4770 
4771 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
4772 		s->first_displayed_line = 1;
4773 		s->last_displayed_line = view->nlines;
4774 		s->selected_line = 1;
4775 	}
4776 	s->matched_line = 0;
4777 
4778 done:
4779 	if (commit)
4780 		got_object_commit_close(commit);
4781 	if (blob)
4782 		got_object_blob_close(blob);
4783 	free(obj_id);
4784 	if (err)
4785 		stop_blame(blame);
4786 	return err;
4787 }
4788 
4789 static const struct got_error *
4790 open_blame_view(struct tog_view *view, char *path,
4791     struct got_object_id *commit_id, struct got_repository *repo)
4792 {
4793 	const struct got_error *err = NULL;
4794 	struct tog_blame_view_state *s = &view->state.blame;
4795 
4796 	STAILQ_INIT(&s->blamed_commits);
4797 
4798 	s->path = strdup(path);
4799 	if (s->path == NULL)
4800 		return got_error_from_errno("strdup");
4801 
4802 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
4803 	if (err) {
4804 		free(s->path);
4805 		return err;
4806 	}
4807 
4808 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
4809 	s->first_displayed_line = 1;
4810 	s->last_displayed_line = view->nlines;
4811 	s->selected_line = 1;
4812 	s->blame_complete = 0;
4813 	s->repo = repo;
4814 	s->commit_id = commit_id;
4815 	memset(&s->blame, 0, sizeof(s->blame));
4816 
4817 	STAILQ_INIT(&s->colors);
4818 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4819 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
4820 		    get_color_value("TOG_COLOR_COMMIT"));
4821 		if (err)
4822 			return err;
4823 	}
4824 
4825 	view->show = show_blame_view;
4826 	view->input = input_blame_view;
4827 	view->close = close_blame_view;
4828 	view->search_start = search_start_blame_view;
4829 	view->search_next = search_next_blame_view;
4830 
4831 	return run_blame(view);
4832 }
4833 
4834 static const struct got_error *
4835 close_blame_view(struct tog_view *view)
4836 {
4837 	const struct got_error *err = NULL;
4838 	struct tog_blame_view_state *s = &view->state.blame;
4839 
4840 	if (s->blame.thread)
4841 		err = stop_blame(&s->blame);
4842 
4843 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
4844 		struct got_object_qid *blamed_commit;
4845 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
4846 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
4847 		got_object_qid_free(blamed_commit);
4848 	}
4849 
4850 	free(s->path);
4851 	free_colors(&s->colors);
4852 	return err;
4853 }
4854 
4855 static const struct got_error *
4856 search_start_blame_view(struct tog_view *view)
4857 {
4858 	struct tog_blame_view_state *s = &view->state.blame;
4859 
4860 	s->matched_line = 0;
4861 	return NULL;
4862 }
4863 
4864 static const struct got_error *
4865 search_next_blame_view(struct tog_view *view)
4866 {
4867 	struct tog_blame_view_state *s = &view->state.blame;
4868 	const struct got_error *err = NULL;
4869 	int lineno;
4870 	char *line = NULL;
4871 	size_t linesize = 0;
4872 	ssize_t linelen;
4873 
4874 	if (!view->searching) {
4875 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4876 		return NULL;
4877 	}
4878 
4879 	if (s->matched_line) {
4880 		if (view->searching == TOG_SEARCH_FORWARD)
4881 			lineno = s->matched_line + 1;
4882 		else
4883 			lineno = s->matched_line - 1;
4884 	} else
4885 		lineno = s->first_displayed_line - 1 + s->selected_line;
4886 
4887 	while (1) {
4888 		off_t offset;
4889 
4890 		if (lineno <= 0 || lineno > s->blame.nlines) {
4891 			if (s->matched_line == 0) {
4892 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4893 				break;
4894 			}
4895 
4896 			if (view->searching == TOG_SEARCH_FORWARD)
4897 				lineno = 1;
4898 			else
4899 				lineno = s->blame.nlines;
4900 		}
4901 
4902 		offset = s->blame.line_offsets[lineno - 1];
4903 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
4904 			free(line);
4905 			return got_error_from_errno("fseeko");
4906 		}
4907 		linelen = getline(&line, &linesize, s->blame.f);
4908 		if (linelen != -1) {
4909 			char *exstr;
4910 			err = expand_tab(&exstr, line);
4911 			if (err)
4912 				break;
4913 			if (match_line(exstr, &view->regex, 1,
4914 			    &view->regmatch)) {
4915 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4916 				s->matched_line = lineno;
4917 				free(exstr);
4918 				break;
4919 			}
4920 			free(exstr);
4921 		}
4922 		if (view->searching == TOG_SEARCH_FORWARD)
4923 			lineno++;
4924 		else
4925 			lineno--;
4926 	}
4927 	free(line);
4928 
4929 	if (s->matched_line) {
4930 		s->first_displayed_line = s->matched_line;
4931 		s->selected_line = 1;
4932 	}
4933 
4934 	return err;
4935 }
4936 
4937 static const struct got_error *
4938 show_blame_view(struct tog_view *view)
4939 {
4940 	const struct got_error *err = NULL;
4941 	struct tog_blame_view_state *s = &view->state.blame;
4942 	int errcode;
4943 
4944 	if (s->blame.thread == 0 && !s->blame_complete) {
4945 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
4946 		    &s->blame.thread_args);
4947 		if (errcode)
4948 			return got_error_set_errno(errcode, "pthread_create");
4949 
4950 		halfdelay(1); /* fast refresh while annotating  */
4951 	}
4952 
4953 	if (s->blame_complete)
4954 		halfdelay(10); /* disable fast refresh */
4955 
4956 	err = draw_blame(view);
4957 
4958 	view_vborder(view);
4959 	return err;
4960 }
4961 
4962 static const struct got_error *
4963 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
4964 {
4965 	const struct got_error *err = NULL, *thread_err = NULL;
4966 	struct tog_view *diff_view;
4967 	struct tog_blame_view_state *s = &view->state.blame;
4968 	int begin_x = 0, nscroll = view->nlines - 2;
4969 
4970 	switch (ch) {
4971 	case '0':
4972 		view->x = 0;
4973 		break;
4974 	case '$':
4975 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4976 		break;
4977 	case KEY_RIGHT:
4978 	case 'l':
4979 		if (view->x + view->ncols / 3 < view->maxx)
4980 			view->x += 2;  /* move two columns right */
4981 		break;
4982 	case KEY_LEFT:
4983 	case 'h':
4984 		view->x -= MIN(view->x, 2);  /* move two columns back */
4985 		break;
4986 	case 'q':
4987 		s->done = 1;
4988 		break;
4989 	case 'g':
4990 	case KEY_HOME:
4991 		s->selected_line = 1;
4992 		s->first_displayed_line = 1;
4993 		break;
4994 	case 'G':
4995 	case KEY_END:
4996 		if (s->blame.nlines < view->nlines - 2) {
4997 			s->selected_line = s->blame.nlines;
4998 			s->first_displayed_line = 1;
4999 		} else {
5000 			s->selected_line = view->nlines - 2;
5001 			s->first_displayed_line = s->blame.nlines -
5002 			    (view->nlines - 3);
5003 		}
5004 		break;
5005 	case 'k':
5006 	case KEY_UP:
5007 	case CTRL('p'):
5008 		if (s->selected_line > 1)
5009 			s->selected_line--;
5010 		else if (s->selected_line == 1 &&
5011 		    s->first_displayed_line > 1)
5012 			s->first_displayed_line--;
5013 		break;
5014 	case CTRL('u'):
5015 	case 'u':
5016 		nscroll /= 2;
5017 		/* FALL THROUGH */
5018 	case KEY_PPAGE:
5019 	case CTRL('b'):
5020 	case 'b':
5021 		if (s->first_displayed_line == 1) {
5022 			s->selected_line = MAX(1, s->selected_line - nscroll);
5023 			break;
5024 		}
5025 		if (s->first_displayed_line > nscroll)
5026 			s->first_displayed_line -= nscroll;
5027 		else
5028 			s->first_displayed_line = 1;
5029 		break;
5030 	case 'j':
5031 	case KEY_DOWN:
5032 	case CTRL('n'):
5033 		if (s->selected_line < view->nlines - 2 &&
5034 		    s->first_displayed_line +
5035 		    s->selected_line <= s->blame.nlines)
5036 			s->selected_line++;
5037 		else if (s->last_displayed_line <
5038 		    s->blame.nlines)
5039 			s->first_displayed_line++;
5040 		break;
5041 	case 'c':
5042 	case 'p': {
5043 		struct got_object_id *id = NULL;
5044 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5045 		    s->first_displayed_line, s->selected_line);
5046 		if (id == NULL)
5047 			break;
5048 		if (ch == 'p') {
5049 			struct got_commit_object *commit, *pcommit;
5050 			struct got_object_qid *pid;
5051 			struct got_object_id *blob_id = NULL;
5052 			int obj_type;
5053 			err = got_object_open_as_commit(&commit,
5054 			    s->repo, id);
5055 			if (err)
5056 				break;
5057 			pid = STAILQ_FIRST(
5058 			    got_object_commit_get_parent_ids(commit));
5059 			if (pid == NULL) {
5060 				got_object_commit_close(commit);
5061 				break;
5062 			}
5063 			/* Check if path history ends here. */
5064 			err = got_object_open_as_commit(&pcommit,
5065 			    s->repo, &pid->id);
5066 			if (err)
5067 				break;
5068 			err = got_object_id_by_path(&blob_id, s->repo,
5069 			    pcommit, s->path);
5070 			got_object_commit_close(pcommit);
5071 			if (err) {
5072 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5073 					err = NULL;
5074 				got_object_commit_close(commit);
5075 				break;
5076 			}
5077 			err = got_object_get_type(&obj_type, s->repo,
5078 			    blob_id);
5079 			free(blob_id);
5080 			/* Can't blame non-blob type objects. */
5081 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5082 				got_object_commit_close(commit);
5083 				break;
5084 			}
5085 			err = got_object_qid_alloc(&s->blamed_commit,
5086 			    &pid->id);
5087 			got_object_commit_close(commit);
5088 		} else {
5089 			if (got_object_id_cmp(id,
5090 			    &s->blamed_commit->id) == 0)
5091 				break;
5092 			err = got_object_qid_alloc(&s->blamed_commit,
5093 			    id);
5094 		}
5095 		if (err)
5096 			break;
5097 		s->done = 1;
5098 		thread_err = stop_blame(&s->blame);
5099 		s->done = 0;
5100 		if (thread_err)
5101 			break;
5102 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5103 		    s->blamed_commit, entry);
5104 		err = run_blame(view);
5105 		if (err)
5106 			break;
5107 		break;
5108 	}
5109 	case 'C': {
5110 		struct got_object_qid *first;
5111 		first = STAILQ_FIRST(&s->blamed_commits);
5112 		if (!got_object_id_cmp(&first->id, s->commit_id))
5113 			break;
5114 		s->done = 1;
5115 		thread_err = stop_blame(&s->blame);
5116 		s->done = 0;
5117 		if (thread_err)
5118 			break;
5119 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5120 		got_object_qid_free(s->blamed_commit);
5121 		s->blamed_commit =
5122 		    STAILQ_FIRST(&s->blamed_commits);
5123 		err = run_blame(view);
5124 		if (err)
5125 			break;
5126 		break;
5127 	}
5128 	case KEY_ENTER:
5129 	case '\r': {
5130 		struct got_object_id *id = NULL;
5131 		struct got_object_qid *pid;
5132 		struct got_commit_object *commit = NULL;
5133 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5134 		    s->first_displayed_line, s->selected_line);
5135 		if (id == NULL)
5136 			break;
5137 		err = got_object_open_as_commit(&commit, s->repo, id);
5138 		if (err)
5139 			break;
5140 		pid = STAILQ_FIRST(
5141 		    got_object_commit_get_parent_ids(commit));
5142 		if (view_is_parent_view(view))
5143 		    begin_x = view_split_begin_x(view->begin_x);
5144 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
5145 		if (diff_view == NULL) {
5146 			got_object_commit_close(commit);
5147 			err = got_error_from_errno("view_open");
5148 			break;
5149 		}
5150 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5151 		    id, NULL, NULL, 3, 0, 0, NULL, s->repo);
5152 		got_object_commit_close(commit);
5153 		if (err) {
5154 			view_close(diff_view);
5155 			break;
5156 		}
5157 		view->focussed = 0;
5158 		diff_view->focussed = 1;
5159 		if (view_is_parent_view(view)) {
5160 			err = view_close_child(view);
5161 			if (err)
5162 				break;
5163 			err = view_set_child(view, diff_view);
5164 			if (err)
5165 				break;
5166 			view->focus_child = 1;
5167 		} else
5168 			*new_view = diff_view;
5169 		if (err)
5170 			break;
5171 		break;
5172 	}
5173 	case CTRL('d'):
5174 	case 'd':
5175 		nscroll /= 2;
5176 		/* FALL THROUGH */
5177 	case KEY_NPAGE:
5178 	case CTRL('f'):
5179 	case 'f':
5180 	case ' ':
5181 		if (s->last_displayed_line >= s->blame.nlines &&
5182 		    s->selected_line >= MIN(s->blame.nlines,
5183 		    view->nlines - 2)) {
5184 			break;
5185 		}
5186 		if (s->last_displayed_line >= s->blame.nlines &&
5187 		    s->selected_line < view->nlines - 2) {
5188 			s->selected_line +=
5189 			    MIN(nscroll, s->last_displayed_line -
5190 			    s->first_displayed_line - s->selected_line + 1);
5191 		}
5192 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5193 			s->first_displayed_line += nscroll;
5194 		else
5195 			s->first_displayed_line =
5196 			    s->blame.nlines - (view->nlines - 3);
5197 		break;
5198 	case KEY_RESIZE:
5199 		if (s->selected_line > view->nlines - 2) {
5200 			s->selected_line = MIN(s->blame.nlines,
5201 			    view->nlines - 2);
5202 		}
5203 		break;
5204 	default:
5205 		break;
5206 	}
5207 	return thread_err ? thread_err : err;
5208 }
5209 
5210 static const struct got_error *
5211 cmd_blame(int argc, char *argv[])
5212 {
5213 	const struct got_error *error;
5214 	struct got_repository *repo = NULL;
5215 	struct got_worktree *worktree = NULL;
5216 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
5217 	char *link_target = NULL;
5218 	struct got_object_id *commit_id = NULL;
5219 	struct got_commit_object *commit = NULL;
5220 	char *commit_id_str = NULL;
5221 	int ch;
5222 	struct tog_view *view;
5223 	int *pack_fds = NULL;
5224 
5225 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
5226 		switch (ch) {
5227 		case 'c':
5228 			commit_id_str = optarg;
5229 			break;
5230 		case 'r':
5231 			repo_path = realpath(optarg, NULL);
5232 			if (repo_path == NULL)
5233 				return got_error_from_errno2("realpath",
5234 				    optarg);
5235 			break;
5236 		default:
5237 			usage_blame();
5238 			/* NOTREACHED */
5239 		}
5240 	}
5241 
5242 	argc -= optind;
5243 	argv += optind;
5244 
5245 	if (argc != 1)
5246 		usage_blame();
5247 
5248 	error = got_repo_pack_fds_open(&pack_fds);
5249 	if (error != NULL)
5250 		goto done;
5251 
5252 	if (repo_path == NULL) {
5253 		cwd = getcwd(NULL, 0);
5254 		if (cwd == NULL)
5255 			return got_error_from_errno("getcwd");
5256 		error = got_worktree_open(&worktree, cwd);
5257 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5258 			goto done;
5259 		if (worktree)
5260 			repo_path =
5261 			    strdup(got_worktree_get_repo_path(worktree));
5262 		else
5263 			repo_path = strdup(cwd);
5264 		if (repo_path == NULL) {
5265 			error = got_error_from_errno("strdup");
5266 			goto done;
5267 		}
5268 	}
5269 
5270 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5271 	if (error != NULL)
5272 		goto done;
5273 
5274 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
5275 	    worktree);
5276 	if (error)
5277 		goto done;
5278 
5279 	init_curses();
5280 
5281 	error = apply_unveil(got_repo_get_path(repo), NULL);
5282 	if (error)
5283 		goto done;
5284 
5285 	error = tog_load_refs(repo, 0);
5286 	if (error)
5287 		goto done;
5288 
5289 	if (commit_id_str == NULL) {
5290 		struct got_reference *head_ref;
5291 		error = got_ref_open(&head_ref, repo, worktree ?
5292 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
5293 		if (error != NULL)
5294 			goto done;
5295 		error = got_ref_resolve(&commit_id, repo, head_ref);
5296 		got_ref_close(head_ref);
5297 	} else {
5298 		error = got_repo_match_object_id(&commit_id, NULL,
5299 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5300 	}
5301 	if (error != NULL)
5302 		goto done;
5303 
5304 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
5305 	if (view == NULL) {
5306 		error = got_error_from_errno("view_open");
5307 		goto done;
5308 	}
5309 
5310 	error = got_object_open_as_commit(&commit, repo, commit_id);
5311 	if (error)
5312 		goto done;
5313 
5314 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
5315 	    commit, repo);
5316 	if (error)
5317 		goto done;
5318 
5319 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
5320 	    commit_id, repo);
5321 	if (error)
5322 		goto done;
5323 	if (worktree) {
5324 		/* Release work tree lock. */
5325 		got_worktree_close(worktree);
5326 		worktree = NULL;
5327 	}
5328 	error = view_loop(view);
5329 done:
5330 	free(repo_path);
5331 	free(in_repo_path);
5332 	free(link_target);
5333 	free(cwd);
5334 	free(commit_id);
5335 	if (commit)
5336 		got_object_commit_close(commit);
5337 	if (worktree)
5338 		got_worktree_close(worktree);
5339 	if (repo) {
5340 		const struct got_error *close_err = got_repo_close(repo);
5341 		if (error == NULL)
5342 			error = close_err;
5343 	}
5344 	if (pack_fds) {
5345 		const struct got_error *pack_err =
5346 		    got_repo_pack_fds_close(pack_fds);
5347 		if (error == NULL)
5348 			error = pack_err;
5349 	}
5350 	tog_free_refs();
5351 	return error;
5352 }
5353 
5354 static const struct got_error *
5355 draw_tree_entries(struct tog_view *view, const char *parent_path)
5356 {
5357 	struct tog_tree_view_state *s = &view->state.tree;
5358 	const struct got_error *err = NULL;
5359 	struct got_tree_entry *te;
5360 	wchar_t *wline;
5361 	struct tog_color *tc;
5362 	int width, n, i, nentries;
5363 	int limit = view->nlines;
5364 
5365 	s->ndisplayed = 0;
5366 
5367 	werase(view->window);
5368 
5369 	if (limit == 0)
5370 		return NULL;
5371 
5372 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
5373 	    0, 0);
5374 	if (err)
5375 		return err;
5376 	if (view_needs_focus_indication(view))
5377 		wstandout(view->window);
5378 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5379 	if (tc)
5380 		wattr_on(view->window,
5381 		    COLOR_PAIR(tc->colorpair), NULL);
5382 	waddwstr(view->window, wline);
5383 	if (tc)
5384 		wattr_off(view->window,
5385 		    COLOR_PAIR(tc->colorpair), NULL);
5386 	if (view_needs_focus_indication(view))
5387 		wstandend(view->window);
5388 	free(wline);
5389 	wline = NULL;
5390 	if (width < view->ncols - 1)
5391 		waddch(view->window, '\n');
5392 	if (--limit <= 0)
5393 		return NULL;
5394 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
5395 	    0, 0);
5396 	if (err)
5397 		return err;
5398 	waddwstr(view->window, wline);
5399 	free(wline);
5400 	wline = NULL;
5401 	if (width < view->ncols - 1)
5402 		waddch(view->window, '\n');
5403 	if (--limit <= 0)
5404 		return NULL;
5405 	waddch(view->window, '\n');
5406 	if (--limit <= 0)
5407 		return NULL;
5408 
5409 	if (s->first_displayed_entry == NULL) {
5410 		te = got_object_tree_get_first_entry(s->tree);
5411 		if (s->selected == 0) {
5412 			if (view->focussed)
5413 				wstandout(view->window);
5414 			s->selected_entry = NULL;
5415 		}
5416 		waddstr(view->window, "  ..\n");	/* parent directory */
5417 		if (s->selected == 0 && view->focussed)
5418 			wstandend(view->window);
5419 		s->ndisplayed++;
5420 		if (--limit <= 0)
5421 			return NULL;
5422 		n = 1;
5423 	} else {
5424 		n = 0;
5425 		te = s->first_displayed_entry;
5426 	}
5427 
5428 	nentries = got_object_tree_get_nentries(s->tree);
5429 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
5430 		char *line = NULL, *id_str = NULL, *link_target = NULL;
5431 		const char *modestr = "";
5432 		mode_t mode;
5433 
5434 		te = got_object_tree_get_entry(s->tree, i);
5435 		mode = got_tree_entry_get_mode(te);
5436 
5437 		if (s->show_ids) {
5438 			err = got_object_id_str(&id_str,
5439 			    got_tree_entry_get_id(te));
5440 			if (err)
5441 				return got_error_from_errno(
5442 				    "got_object_id_str");
5443 		}
5444 		if (got_object_tree_entry_is_submodule(te))
5445 			modestr = "$";
5446 		else if (S_ISLNK(mode)) {
5447 			int i;
5448 
5449 			err = got_tree_entry_get_symlink_target(&link_target,
5450 			    te, s->repo);
5451 			if (err) {
5452 				free(id_str);
5453 				return err;
5454 			}
5455 			for (i = 0; i < strlen(link_target); i++) {
5456 				if (!isprint((unsigned char)link_target[i]))
5457 					link_target[i] = '?';
5458 			}
5459 			modestr = "@";
5460 		}
5461 		else if (S_ISDIR(mode))
5462 			modestr = "/";
5463 		else if (mode & S_IXUSR)
5464 			modestr = "*";
5465 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
5466 		    got_tree_entry_get_name(te), modestr,
5467 		    link_target ? " -> ": "",
5468 		    link_target ? link_target : "") == -1) {
5469 			free(id_str);
5470 			free(link_target);
5471 			return got_error_from_errno("asprintf");
5472 		}
5473 		free(id_str);
5474 		free(link_target);
5475 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
5476 		    0, 0);
5477 		if (err) {
5478 			free(line);
5479 			break;
5480 		}
5481 		if (n == s->selected) {
5482 			if (view->focussed)
5483 				wstandout(view->window);
5484 			s->selected_entry = te;
5485 		}
5486 		tc = match_color(&s->colors, line);
5487 		if (tc)
5488 			wattr_on(view->window,
5489 			    COLOR_PAIR(tc->colorpair), NULL);
5490 		waddwstr(view->window, wline);
5491 		if (tc)
5492 			wattr_off(view->window,
5493 			    COLOR_PAIR(tc->colorpair), NULL);
5494 		if (width < view->ncols - 1)
5495 			waddch(view->window, '\n');
5496 		if (n == s->selected && view->focussed)
5497 			wstandend(view->window);
5498 		free(line);
5499 		free(wline);
5500 		wline = NULL;
5501 		n++;
5502 		s->ndisplayed++;
5503 		s->last_displayed_entry = te;
5504 		if (--limit <= 0)
5505 			break;
5506 	}
5507 
5508 	return err;
5509 }
5510 
5511 static void
5512 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
5513 {
5514 	struct got_tree_entry *te;
5515 	int isroot = s->tree == s->root;
5516 	int i = 0;
5517 
5518 	if (s->first_displayed_entry == NULL)
5519 		return;
5520 
5521 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
5522 	while (i++ < maxscroll) {
5523 		if (te == NULL) {
5524 			if (!isroot)
5525 				s->first_displayed_entry = NULL;
5526 			break;
5527 		}
5528 		s->first_displayed_entry = te;
5529 		te = got_tree_entry_get_prev(s->tree, te);
5530 	}
5531 }
5532 
5533 static void
5534 tree_scroll_down(struct tog_tree_view_state *s, int maxscroll)
5535 {
5536 	struct got_tree_entry *next, *last;
5537 	int n = 0;
5538 
5539 	if (s->first_displayed_entry)
5540 		next = got_tree_entry_get_next(s->tree,
5541 		    s->first_displayed_entry);
5542 	else
5543 		next = got_object_tree_get_first_entry(s->tree);
5544 
5545 	last = s->last_displayed_entry;
5546 	while (next && last && n++ < maxscroll) {
5547 		last = got_tree_entry_get_next(s->tree, last);
5548 		if (last) {
5549 			s->first_displayed_entry = next;
5550 			next = got_tree_entry_get_next(s->tree, next);
5551 		}
5552 	}
5553 }
5554 
5555 static const struct got_error *
5556 tree_entry_path(char **path, struct tog_parent_trees *parents,
5557     struct got_tree_entry *te)
5558 {
5559 	const struct got_error *err = NULL;
5560 	struct tog_parent_tree *pt;
5561 	size_t len = 2; /* for leading slash and NUL */
5562 
5563 	TAILQ_FOREACH(pt, parents, entry)
5564 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
5565 		    + 1 /* slash */;
5566 	if (te)
5567 		len += strlen(got_tree_entry_get_name(te));
5568 
5569 	*path = calloc(1, len);
5570 	if (path == NULL)
5571 		return got_error_from_errno("calloc");
5572 
5573 	(*path)[0] = '/';
5574 	pt = TAILQ_LAST(parents, tog_parent_trees);
5575 	while (pt) {
5576 		const char *name = got_tree_entry_get_name(pt->selected_entry);
5577 		if (strlcat(*path, name, len) >= len) {
5578 			err = got_error(GOT_ERR_NO_SPACE);
5579 			goto done;
5580 		}
5581 		if (strlcat(*path, "/", len) >= len) {
5582 			err = got_error(GOT_ERR_NO_SPACE);
5583 			goto done;
5584 		}
5585 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
5586 	}
5587 	if (te) {
5588 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
5589 			err = got_error(GOT_ERR_NO_SPACE);
5590 			goto done;
5591 		}
5592 	}
5593 done:
5594 	if (err) {
5595 		free(*path);
5596 		*path = NULL;
5597 	}
5598 	return err;
5599 }
5600 
5601 static const struct got_error *
5602 blame_tree_entry(struct tog_view **new_view, int begin_x,
5603     struct got_tree_entry *te, struct tog_parent_trees *parents,
5604     struct got_object_id *commit_id, struct got_repository *repo)
5605 {
5606 	const struct got_error *err = NULL;
5607 	char *path;
5608 	struct tog_view *blame_view;
5609 
5610 	*new_view = NULL;
5611 
5612 	err = tree_entry_path(&path, parents, te);
5613 	if (err)
5614 		return err;
5615 
5616 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
5617 	if (blame_view == NULL) {
5618 		err = got_error_from_errno("view_open");
5619 		goto done;
5620 	}
5621 
5622 	err = open_blame_view(blame_view, path, commit_id, repo);
5623 	if (err) {
5624 		if (err->code == GOT_ERR_CANCELLED)
5625 			err = NULL;
5626 		view_close(blame_view);
5627 	} else
5628 		*new_view = blame_view;
5629 done:
5630 	free(path);
5631 	return err;
5632 }
5633 
5634 static const struct got_error *
5635 log_selected_tree_entry(struct tog_view **new_view, int begin_x,
5636     struct tog_tree_view_state *s)
5637 {
5638 	struct tog_view *log_view;
5639 	const struct got_error *err = NULL;
5640 	char *path;
5641 
5642 	*new_view = NULL;
5643 
5644 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
5645 	if (log_view == NULL)
5646 		return got_error_from_errno("view_open");
5647 
5648 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
5649 	if (err)
5650 		return err;
5651 
5652 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
5653 	    path, 0);
5654 	if (err)
5655 		view_close(log_view);
5656 	else
5657 		*new_view = log_view;
5658 	free(path);
5659 	return err;
5660 }
5661 
5662 static const struct got_error *
5663 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
5664     const char *head_ref_name, struct got_repository *repo)
5665 {
5666 	const struct got_error *err = NULL;
5667 	char *commit_id_str = NULL;
5668 	struct tog_tree_view_state *s = &view->state.tree;
5669 	struct got_commit_object *commit = NULL;
5670 
5671 	TAILQ_INIT(&s->parents);
5672 	STAILQ_INIT(&s->colors);
5673 
5674 	s->commit_id = got_object_id_dup(commit_id);
5675 	if (s->commit_id == NULL)
5676 		return got_error_from_errno("got_object_id_dup");
5677 
5678 	err = got_object_open_as_commit(&commit, repo, commit_id);
5679 	if (err)
5680 		goto done;
5681 
5682 	/*
5683 	 * The root is opened here and will be closed when the view is closed.
5684 	 * Any visited subtrees and their path-wise parents are opened and
5685 	 * closed on demand.
5686 	 */
5687 	err = got_object_open_as_tree(&s->root, repo,
5688 	    got_object_commit_get_tree_id(commit));
5689 	if (err)
5690 		goto done;
5691 	s->tree = s->root;
5692 
5693 	err = got_object_id_str(&commit_id_str, commit_id);
5694 	if (err != NULL)
5695 		goto done;
5696 
5697 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
5698 		err = got_error_from_errno("asprintf");
5699 		goto done;
5700 	}
5701 
5702 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
5703 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
5704 	if (head_ref_name) {
5705 		s->head_ref_name = strdup(head_ref_name);
5706 		if (s->head_ref_name == NULL) {
5707 			err = got_error_from_errno("strdup");
5708 			goto done;
5709 		}
5710 	}
5711 	s->repo = repo;
5712 
5713 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5714 		err = add_color(&s->colors, "\\$$",
5715 		    TOG_COLOR_TREE_SUBMODULE,
5716 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
5717 		if (err)
5718 			goto done;
5719 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
5720 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
5721 		if (err)
5722 			goto done;
5723 		err = add_color(&s->colors, "/$",
5724 		    TOG_COLOR_TREE_DIRECTORY,
5725 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
5726 		if (err)
5727 			goto done;
5728 
5729 		err = add_color(&s->colors, "\\*$",
5730 		    TOG_COLOR_TREE_EXECUTABLE,
5731 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
5732 		if (err)
5733 			goto done;
5734 
5735 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
5736 		    get_color_value("TOG_COLOR_COMMIT"));
5737 		if (err)
5738 			goto done;
5739 	}
5740 
5741 	view->show = show_tree_view;
5742 	view->input = input_tree_view;
5743 	view->close = close_tree_view;
5744 	view->search_start = search_start_tree_view;
5745 	view->search_next = search_next_tree_view;
5746 done:
5747 	free(commit_id_str);
5748 	if (commit)
5749 		got_object_commit_close(commit);
5750 	if (err)
5751 		close_tree_view(view);
5752 	return err;
5753 }
5754 
5755 static const struct got_error *
5756 close_tree_view(struct tog_view *view)
5757 {
5758 	struct tog_tree_view_state *s = &view->state.tree;
5759 
5760 	free_colors(&s->colors);
5761 	free(s->tree_label);
5762 	s->tree_label = NULL;
5763 	free(s->commit_id);
5764 	s->commit_id = NULL;
5765 	free(s->head_ref_name);
5766 	s->head_ref_name = NULL;
5767 	while (!TAILQ_EMPTY(&s->parents)) {
5768 		struct tog_parent_tree *parent;
5769 		parent = TAILQ_FIRST(&s->parents);
5770 		TAILQ_REMOVE(&s->parents, parent, entry);
5771 		if (parent->tree != s->root)
5772 			got_object_tree_close(parent->tree);
5773 		free(parent);
5774 
5775 	}
5776 	if (s->tree != NULL && s->tree != s->root)
5777 		got_object_tree_close(s->tree);
5778 	if (s->root)
5779 		got_object_tree_close(s->root);
5780 	return NULL;
5781 }
5782 
5783 static const struct got_error *
5784 search_start_tree_view(struct tog_view *view)
5785 {
5786 	struct tog_tree_view_state *s = &view->state.tree;
5787 
5788 	s->matched_entry = NULL;
5789 	return NULL;
5790 }
5791 
5792 static int
5793 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
5794 {
5795 	regmatch_t regmatch;
5796 
5797 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
5798 	    0) == 0;
5799 }
5800 
5801 static const struct got_error *
5802 search_next_tree_view(struct tog_view *view)
5803 {
5804 	struct tog_tree_view_state *s = &view->state.tree;
5805 	struct got_tree_entry *te = NULL;
5806 
5807 	if (!view->searching) {
5808 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5809 		return NULL;
5810 	}
5811 
5812 	if (s->matched_entry) {
5813 		if (view->searching == TOG_SEARCH_FORWARD) {
5814 			if (s->selected_entry)
5815 				te = got_tree_entry_get_next(s->tree,
5816 				    s->selected_entry);
5817 			else
5818 				te = got_object_tree_get_first_entry(s->tree);
5819 		} else {
5820 			if (s->selected_entry == NULL)
5821 				te = got_object_tree_get_last_entry(s->tree);
5822 			else
5823 				te = got_tree_entry_get_prev(s->tree,
5824 				    s->selected_entry);
5825 		}
5826 	} else {
5827 		if (s->selected_entry)
5828 			te = s->selected_entry;
5829 		else if (view->searching == TOG_SEARCH_FORWARD)
5830 			te = got_object_tree_get_first_entry(s->tree);
5831 		else
5832 			te = got_object_tree_get_last_entry(s->tree);
5833 	}
5834 
5835 	while (1) {
5836 		if (te == NULL) {
5837 			if (s->matched_entry == NULL) {
5838 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5839 				return NULL;
5840 			}
5841 			if (view->searching == TOG_SEARCH_FORWARD)
5842 				te = got_object_tree_get_first_entry(s->tree);
5843 			else
5844 				te = got_object_tree_get_last_entry(s->tree);
5845 		}
5846 
5847 		if (match_tree_entry(te, &view->regex)) {
5848 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
5849 			s->matched_entry = te;
5850 			break;
5851 		}
5852 
5853 		if (view->searching == TOG_SEARCH_FORWARD)
5854 			te = got_tree_entry_get_next(s->tree, te);
5855 		else
5856 			te = got_tree_entry_get_prev(s->tree, te);
5857 	}
5858 
5859 	if (s->matched_entry) {
5860 		s->first_displayed_entry = s->matched_entry;
5861 		s->selected = 0;
5862 	}
5863 
5864 	return NULL;
5865 }
5866 
5867 static const struct got_error *
5868 show_tree_view(struct tog_view *view)
5869 {
5870 	const struct got_error *err = NULL;
5871 	struct tog_tree_view_state *s = &view->state.tree;
5872 	char *parent_path;
5873 
5874 	err = tree_entry_path(&parent_path, &s->parents, NULL);
5875 	if (err)
5876 		return err;
5877 
5878 	err = draw_tree_entries(view, parent_path);
5879 	free(parent_path);
5880 
5881 	view_vborder(view);
5882 	return err;
5883 }
5884 
5885 static const struct got_error *
5886 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
5887 {
5888 	const struct got_error *err = NULL;
5889 	struct tog_tree_view_state *s = &view->state.tree;
5890 	struct tog_view *log_view, *ref_view;
5891 	struct got_tree_entry *te;
5892 	int begin_x = 0, n, nscroll = view->nlines - 3;
5893 
5894 	switch (ch) {
5895 	case 'i':
5896 		s->show_ids = !s->show_ids;
5897 		break;
5898 	case 'l':
5899 		if (!s->selected_entry)
5900 			break;
5901 		if (view_is_parent_view(view))
5902 			begin_x = view_split_begin_x(view->begin_x);
5903 		err = log_selected_tree_entry(&log_view, begin_x, s);
5904 		view->focussed = 0;
5905 		log_view->focussed = 1;
5906 		if (view_is_parent_view(view)) {
5907 			err = view_close_child(view);
5908 			if (err)
5909 				return err;
5910 			err = view_set_child(view, log_view);
5911 			if (err)
5912 				return err;
5913 			view->focus_child = 1;
5914 		} else
5915 			*new_view = log_view;
5916 		break;
5917 	case 'r':
5918 		if (view_is_parent_view(view))
5919 			begin_x = view_split_begin_x(view->begin_x);
5920 		ref_view = view_open(view->nlines, view->ncols,
5921 		    view->begin_y, begin_x, TOG_VIEW_REF);
5922 		if (ref_view == NULL)
5923 			return got_error_from_errno("view_open");
5924 		err = open_ref_view(ref_view, s->repo);
5925 		if (err) {
5926 			view_close(ref_view);
5927 			return err;
5928 		}
5929 		view->focussed = 0;
5930 		ref_view->focussed = 1;
5931 		if (view_is_parent_view(view)) {
5932 			err = view_close_child(view);
5933 			if (err)
5934 				return err;
5935 			err = view_set_child(view, ref_view);
5936 			if (err)
5937 				return err;
5938 			view->focus_child = 1;
5939 		} else
5940 			*new_view = ref_view;
5941 		break;
5942 	case 'g':
5943 	case KEY_HOME:
5944 		s->selected = 0;
5945 		if (s->tree == s->root)
5946 			s->first_displayed_entry =
5947 			    got_object_tree_get_first_entry(s->tree);
5948 		else
5949 			s->first_displayed_entry = NULL;
5950 		break;
5951 	case 'G':
5952 	case KEY_END:
5953 		s->selected = 0;
5954 		te = got_object_tree_get_last_entry(s->tree);
5955 		for (n = 0; n < view->nlines - 3; n++) {
5956 			if (te == NULL) {
5957 				if(s->tree != s->root) {
5958 					s->first_displayed_entry = NULL;
5959 					n++;
5960 				}
5961 				break;
5962 			}
5963 			s->first_displayed_entry = te;
5964 			te = got_tree_entry_get_prev(s->tree, te);
5965 		}
5966 		if (n > 0)
5967 			s->selected = n - 1;
5968 		break;
5969 	case 'k':
5970 	case KEY_UP:
5971 	case CTRL('p'):
5972 		if (s->selected > 0) {
5973 			s->selected--;
5974 			break;
5975 		}
5976 		tree_scroll_up(s, 1);
5977 		break;
5978 	case CTRL('u'):
5979 	case 'u':
5980 		nscroll /= 2;
5981 		/* FALL THROUGH */
5982 	case KEY_PPAGE:
5983 	case CTRL('b'):
5984 	case 'b':
5985 		if (s->tree == s->root) {
5986 			if (got_object_tree_get_first_entry(s->tree) ==
5987 			    s->first_displayed_entry)
5988 				s->selected -= MIN(s->selected, nscroll);
5989 		} else {
5990 			if (s->first_displayed_entry == NULL)
5991 				s->selected -= MIN(s->selected, nscroll);
5992 		}
5993 		tree_scroll_up(s, MAX(0, nscroll));
5994 		break;
5995 	case 'j':
5996 	case KEY_DOWN:
5997 	case CTRL('n'):
5998 		if (s->selected < s->ndisplayed - 1) {
5999 			s->selected++;
6000 			break;
6001 		}
6002 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6003 		    == NULL)
6004 			/* can't scroll any further */
6005 			break;
6006 		tree_scroll_down(s, 1);
6007 		break;
6008 	case CTRL('d'):
6009 	case 'd':
6010 		nscroll /= 2;
6011 		/* FALL THROUGH */
6012 	case KEY_NPAGE:
6013 	case CTRL('f'):
6014 	case 'f':
6015 	case ' ':
6016 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6017 		    == NULL) {
6018 			/* can't scroll any further; move cursor down */
6019 			if (s->selected < s->ndisplayed - 1)
6020 				s->selected += MIN(nscroll,
6021 				    s->ndisplayed - s->selected - 1);
6022 			break;
6023 		}
6024 		tree_scroll_down(s, nscroll);
6025 		break;
6026 	case KEY_ENTER:
6027 	case '\r':
6028 	case KEY_BACKSPACE:
6029 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6030 			struct tog_parent_tree *parent;
6031 			/* user selected '..' */
6032 			if (s->tree == s->root)
6033 				break;
6034 			parent = TAILQ_FIRST(&s->parents);
6035 			TAILQ_REMOVE(&s->parents, parent,
6036 			    entry);
6037 			got_object_tree_close(s->tree);
6038 			s->tree = parent->tree;
6039 			s->first_displayed_entry =
6040 			    parent->first_displayed_entry;
6041 			s->selected_entry =
6042 			    parent->selected_entry;
6043 			s->selected = parent->selected;
6044 			free(parent);
6045 		} else if (S_ISDIR(got_tree_entry_get_mode(
6046 		    s->selected_entry))) {
6047 			struct got_tree_object *subtree;
6048 			err = got_object_open_as_tree(&subtree, s->repo,
6049 			    got_tree_entry_get_id(s->selected_entry));
6050 			if (err)
6051 				break;
6052 			err = tree_view_visit_subtree(s, subtree);
6053 			if (err) {
6054 				got_object_tree_close(subtree);
6055 				break;
6056 			}
6057 		} else if (S_ISREG(got_tree_entry_get_mode(
6058 		    s->selected_entry))) {
6059 			struct tog_view *blame_view;
6060 			int begin_x = view_is_parent_view(view) ?
6061 			    view_split_begin_x(view->begin_x) : 0;
6062 
6063 			err = blame_tree_entry(&blame_view, begin_x,
6064 			    s->selected_entry, &s->parents,
6065 			    s->commit_id, s->repo);
6066 			if (err)
6067 				break;
6068 			view->focussed = 0;
6069 			blame_view->focussed = 1;
6070 			if (view_is_parent_view(view)) {
6071 				err = view_close_child(view);
6072 				if (err)
6073 					return err;
6074 				err = view_set_child(view, blame_view);
6075 				if (err)
6076 					return err;
6077 				view->focus_child = 1;
6078 			} else
6079 				*new_view = blame_view;
6080 		}
6081 		break;
6082 	case KEY_RESIZE:
6083 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6084 			s->selected = view->nlines - 4;
6085 		break;
6086 	default:
6087 		break;
6088 	}
6089 
6090 	return err;
6091 }
6092 
6093 __dead static void
6094 usage_tree(void)
6095 {
6096 	endwin();
6097 	fprintf(stderr,
6098 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6099 	    getprogname());
6100 	exit(1);
6101 }
6102 
6103 static const struct got_error *
6104 cmd_tree(int argc, char *argv[])
6105 {
6106 	const struct got_error *error;
6107 	struct got_repository *repo = NULL;
6108 	struct got_worktree *worktree = NULL;
6109 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6110 	struct got_object_id *commit_id = NULL;
6111 	struct got_commit_object *commit = NULL;
6112 	const char *commit_id_arg = NULL;
6113 	char *label = NULL;
6114 	struct got_reference *ref = NULL;
6115 	const char *head_ref_name = NULL;
6116 	int ch;
6117 	struct tog_view *view;
6118 	int *pack_fds = NULL;
6119 
6120 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6121 		switch (ch) {
6122 		case 'c':
6123 			commit_id_arg = optarg;
6124 			break;
6125 		case 'r':
6126 			repo_path = realpath(optarg, NULL);
6127 			if (repo_path == NULL)
6128 				return got_error_from_errno2("realpath",
6129 				    optarg);
6130 			break;
6131 		default:
6132 			usage_tree();
6133 			/* NOTREACHED */
6134 		}
6135 	}
6136 
6137 	argc -= optind;
6138 	argv += optind;
6139 
6140 	if (argc > 1)
6141 		usage_tree();
6142 
6143 	error = got_repo_pack_fds_open(&pack_fds);
6144 	if (error != NULL)
6145 		goto done;
6146 
6147 	if (repo_path == NULL) {
6148 		cwd = getcwd(NULL, 0);
6149 		if (cwd == NULL)
6150 			return got_error_from_errno("getcwd");
6151 		error = got_worktree_open(&worktree, cwd);
6152 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6153 			goto done;
6154 		if (worktree)
6155 			repo_path =
6156 			    strdup(got_worktree_get_repo_path(worktree));
6157 		else
6158 			repo_path = strdup(cwd);
6159 		if (repo_path == NULL) {
6160 			error = got_error_from_errno("strdup");
6161 			goto done;
6162 		}
6163 	}
6164 
6165 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6166 	if (error != NULL)
6167 		goto done;
6168 
6169 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
6170 	    repo, worktree);
6171 	if (error)
6172 		goto done;
6173 
6174 	init_curses();
6175 
6176 	error = apply_unveil(got_repo_get_path(repo), NULL);
6177 	if (error)
6178 		goto done;
6179 
6180 	error = tog_load_refs(repo, 0);
6181 	if (error)
6182 		goto done;
6183 
6184 	if (commit_id_arg == NULL) {
6185 		error = got_repo_match_object_id(&commit_id, &label,
6186 		    worktree ? got_worktree_get_head_ref_name(worktree) :
6187 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6188 		if (error)
6189 			goto done;
6190 		head_ref_name = label;
6191 	} else {
6192 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
6193 		if (error == NULL)
6194 			head_ref_name = got_ref_get_name(ref);
6195 		else if (error->code != GOT_ERR_NOT_REF)
6196 			goto done;
6197 		error = got_repo_match_object_id(&commit_id, NULL,
6198 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6199 		if (error)
6200 			goto done;
6201 	}
6202 
6203 	error = got_object_open_as_commit(&commit, repo, commit_id);
6204 	if (error)
6205 		goto done;
6206 
6207 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
6208 	if (view == NULL) {
6209 		error = got_error_from_errno("view_open");
6210 		goto done;
6211 	}
6212 	error = open_tree_view(view, commit_id, head_ref_name, repo);
6213 	if (error)
6214 		goto done;
6215 	if (!got_path_is_root_dir(in_repo_path)) {
6216 		error = tree_view_walk_path(&view->state.tree, commit,
6217 		    in_repo_path);
6218 		if (error)
6219 			goto done;
6220 	}
6221 
6222 	if (worktree) {
6223 		/* Release work tree lock. */
6224 		got_worktree_close(worktree);
6225 		worktree = NULL;
6226 	}
6227 	error = view_loop(view);
6228 done:
6229 	free(repo_path);
6230 	free(cwd);
6231 	free(commit_id);
6232 	free(label);
6233 	if (ref)
6234 		got_ref_close(ref);
6235 	if (repo) {
6236 		const struct got_error *close_err = got_repo_close(repo);
6237 		if (error == NULL)
6238 			error = close_err;
6239 	}
6240 	if (pack_fds) {
6241 		const struct got_error *pack_err =
6242 		    got_repo_pack_fds_close(pack_fds);
6243 		if (error == NULL)
6244 			error = pack_err;
6245 	}
6246 	tog_free_refs();
6247 	return error;
6248 }
6249 
6250 static const struct got_error *
6251 ref_view_load_refs(struct tog_ref_view_state *s)
6252 {
6253 	struct got_reflist_entry *sre;
6254 	struct tog_reflist_entry *re;
6255 
6256 	s->nrefs = 0;
6257 	TAILQ_FOREACH(sre, &tog_refs, entry) {
6258 		if (strncmp(got_ref_get_name(sre->ref),
6259 		    "refs/got/", 9) == 0 &&
6260 		    strncmp(got_ref_get_name(sre->ref),
6261 		    "refs/got/backup/", 16) != 0)
6262 			continue;
6263 
6264 		re = malloc(sizeof(*re));
6265 		if (re == NULL)
6266 			return got_error_from_errno("malloc");
6267 
6268 		re->ref = got_ref_dup(sre->ref);
6269 		if (re->ref == NULL)
6270 			return got_error_from_errno("got_ref_dup");
6271 		re->idx = s->nrefs++;
6272 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
6273 	}
6274 
6275 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
6276 	return NULL;
6277 }
6278 
6279 void
6280 ref_view_free_refs(struct tog_ref_view_state *s)
6281 {
6282 	struct tog_reflist_entry *re;
6283 
6284 	while (!TAILQ_EMPTY(&s->refs)) {
6285 		re = TAILQ_FIRST(&s->refs);
6286 		TAILQ_REMOVE(&s->refs, re, entry);
6287 		got_ref_close(re->ref);
6288 		free(re);
6289 	}
6290 }
6291 
6292 static const struct got_error *
6293 open_ref_view(struct tog_view *view, struct got_repository *repo)
6294 {
6295 	const struct got_error *err = NULL;
6296 	struct tog_ref_view_state *s = &view->state.ref;
6297 
6298 	s->selected_entry = 0;
6299 	s->repo = repo;
6300 
6301 	TAILQ_INIT(&s->refs);
6302 	STAILQ_INIT(&s->colors);
6303 
6304 	err = ref_view_load_refs(s);
6305 	if (err)
6306 		return err;
6307 
6308 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6309 		err = add_color(&s->colors, "^refs/heads/",
6310 		    TOG_COLOR_REFS_HEADS,
6311 		    get_color_value("TOG_COLOR_REFS_HEADS"));
6312 		if (err)
6313 			goto done;
6314 
6315 		err = add_color(&s->colors, "^refs/tags/",
6316 		    TOG_COLOR_REFS_TAGS,
6317 		    get_color_value("TOG_COLOR_REFS_TAGS"));
6318 		if (err)
6319 			goto done;
6320 
6321 		err = add_color(&s->colors, "^refs/remotes/",
6322 		    TOG_COLOR_REFS_REMOTES,
6323 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
6324 		if (err)
6325 			goto done;
6326 
6327 		err = add_color(&s->colors, "^refs/got/backup/",
6328 		    TOG_COLOR_REFS_BACKUP,
6329 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
6330 		if (err)
6331 			goto done;
6332 	}
6333 
6334 	view->show = show_ref_view;
6335 	view->input = input_ref_view;
6336 	view->close = close_ref_view;
6337 	view->search_start = search_start_ref_view;
6338 	view->search_next = search_next_ref_view;
6339 done:
6340 	if (err)
6341 		free_colors(&s->colors);
6342 	return err;
6343 }
6344 
6345 static const struct got_error *
6346 close_ref_view(struct tog_view *view)
6347 {
6348 	struct tog_ref_view_state *s = &view->state.ref;
6349 
6350 	ref_view_free_refs(s);
6351 	free_colors(&s->colors);
6352 
6353 	return NULL;
6354 }
6355 
6356 static const struct got_error *
6357 resolve_reflist_entry(struct got_object_id **commit_id,
6358     struct tog_reflist_entry *re, struct got_repository *repo)
6359 {
6360 	const struct got_error *err = NULL;
6361 	struct got_object_id *obj_id;
6362 	struct got_tag_object *tag = NULL;
6363 	int obj_type;
6364 
6365 	*commit_id = NULL;
6366 
6367 	err = got_ref_resolve(&obj_id, repo, re->ref);
6368 	if (err)
6369 		return err;
6370 
6371 	err = got_object_get_type(&obj_type, repo, obj_id);
6372 	if (err)
6373 		goto done;
6374 
6375 	switch (obj_type) {
6376 	case GOT_OBJ_TYPE_COMMIT:
6377 		*commit_id = obj_id;
6378 		break;
6379 	case GOT_OBJ_TYPE_TAG:
6380 		err = got_object_open_as_tag(&tag, repo, obj_id);
6381 		if (err)
6382 			goto done;
6383 		free(obj_id);
6384 		err = got_object_get_type(&obj_type, repo,
6385 		    got_object_tag_get_object_id(tag));
6386 		if (err)
6387 			goto done;
6388 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
6389 			err = got_error(GOT_ERR_OBJ_TYPE);
6390 			goto done;
6391 		}
6392 		*commit_id = got_object_id_dup(
6393 		    got_object_tag_get_object_id(tag));
6394 		if (*commit_id == NULL) {
6395 			err = got_error_from_errno("got_object_id_dup");
6396 			goto done;
6397 		}
6398 		break;
6399 	default:
6400 		err = got_error(GOT_ERR_OBJ_TYPE);
6401 		break;
6402 	}
6403 
6404 done:
6405 	if (tag)
6406 		got_object_tag_close(tag);
6407 	if (err) {
6408 		free(*commit_id);
6409 		*commit_id = NULL;
6410 	}
6411 	return err;
6412 }
6413 
6414 static const struct got_error *
6415 log_ref_entry(struct tog_view **new_view, int begin_x,
6416     struct tog_reflist_entry *re, struct got_repository *repo)
6417 {
6418 	struct tog_view *log_view;
6419 	const struct got_error *err = NULL;
6420 	struct got_object_id *commit_id = NULL;
6421 
6422 	*new_view = NULL;
6423 
6424 	err = resolve_reflist_entry(&commit_id, re, repo);
6425 	if (err) {
6426 		if (err->code != GOT_ERR_OBJ_TYPE)
6427 			return err;
6428 		else
6429 			return NULL;
6430 	}
6431 
6432 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
6433 	if (log_view == NULL) {
6434 		err = got_error_from_errno("view_open");
6435 		goto done;
6436 	}
6437 
6438 	err = open_log_view(log_view, commit_id, repo,
6439 	    got_ref_get_name(re->ref), "", 0);
6440 done:
6441 	if (err)
6442 		view_close(log_view);
6443 	else
6444 		*new_view = log_view;
6445 	free(commit_id);
6446 	return err;
6447 }
6448 
6449 static void
6450 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
6451 {
6452 	struct tog_reflist_entry *re;
6453 	int i = 0;
6454 
6455 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
6456 		return;
6457 
6458 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
6459 	while (i++ < maxscroll) {
6460 		if (re == NULL)
6461 			break;
6462 		s->first_displayed_entry = re;
6463 		re = TAILQ_PREV(re, tog_reflist_head, entry);
6464 	}
6465 }
6466 
6467 static void
6468 ref_scroll_down(struct tog_ref_view_state *s, int maxscroll)
6469 {
6470 	struct tog_reflist_entry *next, *last;
6471 	int n = 0;
6472 
6473 	if (s->first_displayed_entry)
6474 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
6475 	else
6476 		next = TAILQ_FIRST(&s->refs);
6477 
6478 	last = s->last_displayed_entry;
6479 	while (next && last && n++ < maxscroll) {
6480 		last = TAILQ_NEXT(last, entry);
6481 		if (last) {
6482 			s->first_displayed_entry = next;
6483 			next = TAILQ_NEXT(next, entry);
6484 		}
6485 	}
6486 }
6487 
6488 static const struct got_error *
6489 search_start_ref_view(struct tog_view *view)
6490 {
6491 	struct tog_ref_view_state *s = &view->state.ref;
6492 
6493 	s->matched_entry = NULL;
6494 	return NULL;
6495 }
6496 
6497 static int
6498 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
6499 {
6500 	regmatch_t regmatch;
6501 
6502 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
6503 	    0) == 0;
6504 }
6505 
6506 static const struct got_error *
6507 search_next_ref_view(struct tog_view *view)
6508 {
6509 	struct tog_ref_view_state *s = &view->state.ref;
6510 	struct tog_reflist_entry *re = NULL;
6511 
6512 	if (!view->searching) {
6513 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6514 		return NULL;
6515 	}
6516 
6517 	if (s->matched_entry) {
6518 		if (view->searching == TOG_SEARCH_FORWARD) {
6519 			if (s->selected_entry)
6520 				re = TAILQ_NEXT(s->selected_entry, entry);
6521 			else
6522 				re = TAILQ_PREV(s->selected_entry,
6523 				    tog_reflist_head, entry);
6524 		} else {
6525 			if (s->selected_entry == NULL)
6526 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
6527 			else
6528 				re = TAILQ_PREV(s->selected_entry,
6529 				    tog_reflist_head, entry);
6530 		}
6531 	} else {
6532 		if (s->selected_entry)
6533 			re = s->selected_entry;
6534 		else if (view->searching == TOG_SEARCH_FORWARD)
6535 			re = TAILQ_FIRST(&s->refs);
6536 		else
6537 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
6538 	}
6539 
6540 	while (1) {
6541 		if (re == NULL) {
6542 			if (s->matched_entry == NULL) {
6543 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6544 				return NULL;
6545 			}
6546 			if (view->searching == TOG_SEARCH_FORWARD)
6547 				re = TAILQ_FIRST(&s->refs);
6548 			else
6549 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
6550 		}
6551 
6552 		if (match_reflist_entry(re, &view->regex)) {
6553 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6554 			s->matched_entry = re;
6555 			break;
6556 		}
6557 
6558 		if (view->searching == TOG_SEARCH_FORWARD)
6559 			re = TAILQ_NEXT(re, entry);
6560 		else
6561 			re = TAILQ_PREV(re, tog_reflist_head, entry);
6562 	}
6563 
6564 	if (s->matched_entry) {
6565 		s->first_displayed_entry = s->matched_entry;
6566 		s->selected = 0;
6567 	}
6568 
6569 	return NULL;
6570 }
6571 
6572 static const struct got_error *
6573 show_ref_view(struct tog_view *view)
6574 {
6575 	const struct got_error *err = NULL;
6576 	struct tog_ref_view_state *s = &view->state.ref;
6577 	struct tog_reflist_entry *re;
6578 	char *line = NULL;
6579 	wchar_t *wline;
6580 	struct tog_color *tc;
6581 	int width, n;
6582 	int limit = view->nlines;
6583 
6584 	werase(view->window);
6585 
6586 	s->ndisplayed = 0;
6587 
6588 	if (limit == 0)
6589 		return NULL;
6590 
6591 	re = s->first_displayed_entry;
6592 
6593 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
6594 	    s->nrefs) == -1)
6595 		return got_error_from_errno("asprintf");
6596 
6597 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6598 	if (err) {
6599 		free(line);
6600 		return err;
6601 	}
6602 	if (view_needs_focus_indication(view))
6603 		wstandout(view->window);
6604 	waddwstr(view->window, wline);
6605 	if (view_needs_focus_indication(view))
6606 		wstandend(view->window);
6607 	free(wline);
6608 	wline = NULL;
6609 	free(line);
6610 	line = NULL;
6611 	if (width < view->ncols - 1)
6612 		waddch(view->window, '\n');
6613 	if (--limit <= 0)
6614 		return NULL;
6615 
6616 	n = 0;
6617 	while (re && limit > 0) {
6618 		char *line = NULL;
6619 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
6620 
6621 		if (s->show_date) {
6622 			struct got_commit_object *ci;
6623 			struct got_tag_object *tag;
6624 			struct got_object_id *id;
6625 			struct tm tm;
6626 			time_t t;
6627 
6628 			err = got_ref_resolve(&id, s->repo, re->ref);
6629 			if (err)
6630 				return err;
6631 			err = got_object_open_as_tag(&tag, s->repo, id);
6632 			if (err) {
6633 				if (err->code != GOT_ERR_OBJ_TYPE) {
6634 					free(id);
6635 					return err;
6636 				}
6637 				err = got_object_open_as_commit(&ci, s->repo,
6638 				    id);
6639 				if (err) {
6640 					free(id);
6641 					return err;
6642 				}
6643 				t = got_object_commit_get_committer_time(ci);
6644 				got_object_commit_close(ci);
6645 			} else {
6646 				t = got_object_tag_get_tagger_time(tag);
6647 				got_object_tag_close(tag);
6648 			}
6649 			free(id);
6650 			if (gmtime_r(&t, &tm) == NULL)
6651 				return got_error_from_errno("gmtime_r");
6652 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
6653 				return got_error(GOT_ERR_NO_SPACE);
6654 		}
6655 		if (got_ref_is_symbolic(re->ref)) {
6656 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
6657 			    ymd : "", got_ref_get_name(re->ref),
6658 			    got_ref_get_symref_target(re->ref)) == -1)
6659 				return got_error_from_errno("asprintf");
6660 		} else if (s->show_ids) {
6661 			struct got_object_id *id;
6662 			char *id_str;
6663 			err = got_ref_resolve(&id, s->repo, re->ref);
6664 			if (err)
6665 				return err;
6666 			err = got_object_id_str(&id_str, id);
6667 			if (err) {
6668 				free(id);
6669 				return err;
6670 			}
6671 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
6672 			    got_ref_get_name(re->ref), id_str) == -1) {
6673 				err = got_error_from_errno("asprintf");
6674 				free(id);
6675 				free(id_str);
6676 				return err;
6677 			}
6678 			free(id);
6679 			free(id_str);
6680 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
6681 		    got_ref_get_name(re->ref)) == -1)
6682 			return got_error_from_errno("asprintf");
6683 
6684 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6685 		    0, 0);
6686 		if (err) {
6687 			free(line);
6688 			return err;
6689 		}
6690 		if (n == s->selected) {
6691 			if (view->focussed)
6692 				wstandout(view->window);
6693 			s->selected_entry = re;
6694 		}
6695 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
6696 		if (tc)
6697 			wattr_on(view->window,
6698 			    COLOR_PAIR(tc->colorpair), NULL);
6699 		waddwstr(view->window, wline);
6700 		if (tc)
6701 			wattr_off(view->window,
6702 			    COLOR_PAIR(tc->colorpair), NULL);
6703 		if (width < view->ncols - 1)
6704 			waddch(view->window, '\n');
6705 		if (n == s->selected && view->focussed)
6706 			wstandend(view->window);
6707 		free(line);
6708 		free(wline);
6709 		wline = NULL;
6710 		n++;
6711 		s->ndisplayed++;
6712 		s->last_displayed_entry = re;
6713 
6714 		limit--;
6715 		re = TAILQ_NEXT(re, entry);
6716 	}
6717 
6718 	view_vborder(view);
6719 	return err;
6720 }
6721 
6722 static const struct got_error *
6723 browse_ref_tree(struct tog_view **new_view, int begin_x,
6724     struct tog_reflist_entry *re, struct got_repository *repo)
6725 {
6726 	const struct got_error *err = NULL;
6727 	struct got_object_id *commit_id = NULL;
6728 	struct tog_view *tree_view;
6729 
6730 	*new_view = NULL;
6731 
6732 	err = resolve_reflist_entry(&commit_id, re, repo);
6733 	if (err) {
6734 		if (err->code != GOT_ERR_OBJ_TYPE)
6735 			return err;
6736 		else
6737 			return NULL;
6738 	}
6739 
6740 
6741 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
6742 	if (tree_view == NULL) {
6743 		err = got_error_from_errno("view_open");
6744 		goto done;
6745 	}
6746 
6747 	err = open_tree_view(tree_view, commit_id,
6748 	    got_ref_get_name(re->ref), repo);
6749 	if (err)
6750 		goto done;
6751 
6752 	*new_view = tree_view;
6753 done:
6754 	free(commit_id);
6755 	return err;
6756 }
6757 static const struct got_error *
6758 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
6759 {
6760 	const struct got_error *err = NULL;
6761 	struct tog_ref_view_state *s = &view->state.ref;
6762 	struct tog_view *log_view, *tree_view;
6763 	struct tog_reflist_entry *re;
6764 	int begin_x = 0, n, nscroll = view->nlines - 1;
6765 
6766 	switch (ch) {
6767 	case 'i':
6768 		s->show_ids = !s->show_ids;
6769 		break;
6770 	case 'm':
6771 		s->show_date = !s->show_date;
6772 		break;
6773 	case 'o':
6774 		s->sort_by_date = !s->sort_by_date;
6775 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
6776 		    got_ref_cmp_by_commit_timestamp_descending :
6777 		    tog_ref_cmp_by_name, s->repo);
6778 		if (err)
6779 			break;
6780 		got_reflist_object_id_map_free(tog_refs_idmap);
6781 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
6782 		    &tog_refs, s->repo);
6783 		if (err)
6784 			break;
6785 		ref_view_free_refs(s);
6786 		err = ref_view_load_refs(s);
6787 		break;
6788 	case KEY_ENTER:
6789 	case '\r':
6790 		if (!s->selected_entry)
6791 			break;
6792 		if (view_is_parent_view(view))
6793 			begin_x = view_split_begin_x(view->begin_x);
6794 		err = log_ref_entry(&log_view, begin_x, s->selected_entry,
6795 		    s->repo);
6796 		view->focussed = 0;
6797 		log_view->focussed = 1;
6798 		if (view_is_parent_view(view)) {
6799 			err = view_close_child(view);
6800 			if (err)
6801 				return err;
6802 			err = view_set_child(view, log_view);
6803 			if (err)
6804 				return err;
6805 			view->focus_child = 1;
6806 		} else
6807 			*new_view = log_view;
6808 		break;
6809 	case 't':
6810 		if (!s->selected_entry)
6811 			break;
6812 		if (view_is_parent_view(view))
6813 			begin_x = view_split_begin_x(view->begin_x);
6814 		err = browse_ref_tree(&tree_view, begin_x, s->selected_entry,
6815 		    s->repo);
6816 		if (err || tree_view == NULL)
6817 			break;
6818 		view->focussed = 0;
6819 		tree_view->focussed = 1;
6820 		if (view_is_parent_view(view)) {
6821 			err = view_close_child(view);
6822 			if (err)
6823 				return err;
6824 			err = view_set_child(view, tree_view);
6825 			if (err)
6826 				return err;
6827 			view->focus_child = 1;
6828 		} else
6829 			*new_view = tree_view;
6830 		break;
6831 	case 'g':
6832 	case KEY_HOME:
6833 		s->selected = 0;
6834 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
6835 		break;
6836 	case 'G':
6837 	case KEY_END:
6838 		s->selected = 0;
6839 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
6840 		for (n = 0; n < view->nlines - 1; n++) {
6841 			if (re == NULL)
6842 				break;
6843 			s->first_displayed_entry = re;
6844 			re = TAILQ_PREV(re, tog_reflist_head, entry);
6845 		}
6846 		if (n > 0)
6847 			s->selected = n - 1;
6848 		break;
6849 	case 'k':
6850 	case KEY_UP:
6851 	case CTRL('p'):
6852 		if (s->selected > 0) {
6853 			s->selected--;
6854 			break;
6855 		}
6856 		ref_scroll_up(s, 1);
6857 		break;
6858 	case CTRL('u'):
6859 	case 'u':
6860 		nscroll /= 2;
6861 		/* FALL THROUGH */
6862 	case KEY_PPAGE:
6863 	case CTRL('b'):
6864 	case 'b':
6865 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
6866 			s->selected -= MIN(nscroll, s->selected);
6867 		ref_scroll_up(s, MAX(0, nscroll));
6868 		break;
6869 	case 'j':
6870 	case KEY_DOWN:
6871 	case CTRL('n'):
6872 		if (s->selected < s->ndisplayed - 1) {
6873 			s->selected++;
6874 			break;
6875 		}
6876 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL)
6877 			/* can't scroll any further */
6878 			break;
6879 		ref_scroll_down(s, 1);
6880 		break;
6881 	case CTRL('d'):
6882 	case 'd':
6883 		nscroll /= 2;
6884 		/* FALL THROUGH */
6885 	case KEY_NPAGE:
6886 	case CTRL('f'):
6887 	case 'f':
6888 	case ' ':
6889 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
6890 			/* can't scroll any further; move cursor down */
6891 			if (s->selected < s->ndisplayed - 1)
6892 				s->selected += MIN(nscroll,
6893 				    s->ndisplayed - s->selected - 1);
6894 			break;
6895 		}
6896 		ref_scroll_down(s, nscroll);
6897 		break;
6898 	case CTRL('l'):
6899 		tog_free_refs();
6900 		err = tog_load_refs(s->repo, s->sort_by_date);
6901 		if (err)
6902 			break;
6903 		ref_view_free_refs(s);
6904 		err = ref_view_load_refs(s);
6905 		break;
6906 	case KEY_RESIZE:
6907 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
6908 			s->selected = view->nlines - 2;
6909 		break;
6910 	default:
6911 		break;
6912 	}
6913 
6914 	return err;
6915 }
6916 
6917 __dead static void
6918 usage_ref(void)
6919 {
6920 	endwin();
6921 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
6922 	    getprogname());
6923 	exit(1);
6924 }
6925 
6926 static const struct got_error *
6927 cmd_ref(int argc, char *argv[])
6928 {
6929 	const struct got_error *error;
6930 	struct got_repository *repo = NULL;
6931 	struct got_worktree *worktree = NULL;
6932 	char *cwd = NULL, *repo_path = NULL;
6933 	int ch;
6934 	struct tog_view *view;
6935 	int *pack_fds = NULL;
6936 
6937 	while ((ch = getopt(argc, argv, "r:")) != -1) {
6938 		switch (ch) {
6939 		case 'r':
6940 			repo_path = realpath(optarg, NULL);
6941 			if (repo_path == NULL)
6942 				return got_error_from_errno2("realpath",
6943 				    optarg);
6944 			break;
6945 		default:
6946 			usage_ref();
6947 			/* NOTREACHED */
6948 		}
6949 	}
6950 
6951 	argc -= optind;
6952 	argv += optind;
6953 
6954 	if (argc > 1)
6955 		usage_ref();
6956 
6957 	error = got_repo_pack_fds_open(&pack_fds);
6958 	if (error != NULL)
6959 		goto done;
6960 
6961 	if (repo_path == NULL) {
6962 		cwd = getcwd(NULL, 0);
6963 		if (cwd == NULL)
6964 			return got_error_from_errno("getcwd");
6965 		error = got_worktree_open(&worktree, cwd);
6966 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6967 			goto done;
6968 		if (worktree)
6969 			repo_path =
6970 			    strdup(got_worktree_get_repo_path(worktree));
6971 		else
6972 			repo_path = strdup(cwd);
6973 		if (repo_path == NULL) {
6974 			error = got_error_from_errno("strdup");
6975 			goto done;
6976 		}
6977 	}
6978 
6979 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6980 	if (error != NULL)
6981 		goto done;
6982 
6983 	init_curses();
6984 
6985 	error = apply_unveil(got_repo_get_path(repo), NULL);
6986 	if (error)
6987 		goto done;
6988 
6989 	error = tog_load_refs(repo, 0);
6990 	if (error)
6991 		goto done;
6992 
6993 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
6994 	if (view == NULL) {
6995 		error = got_error_from_errno("view_open");
6996 		goto done;
6997 	}
6998 
6999 	error = open_ref_view(view, repo);
7000 	if (error)
7001 		goto done;
7002 
7003 	if (worktree) {
7004 		/* Release work tree lock. */
7005 		got_worktree_close(worktree);
7006 		worktree = NULL;
7007 	}
7008 	error = view_loop(view);
7009 done:
7010 	free(repo_path);
7011 	free(cwd);
7012 	if (repo) {
7013 		const struct got_error *close_err = got_repo_close(repo);
7014 		if (close_err)
7015 			error = close_err;
7016 	}
7017 	if (pack_fds) {
7018 		const struct got_error *pack_err =
7019 		    got_repo_pack_fds_close(pack_fds);
7020 		if (error == NULL)
7021 			error = pack_err;
7022 	}
7023 	tog_free_refs();
7024 	return error;
7025 }
7026 
7027 static void
7028 list_commands(FILE *fp)
7029 {
7030 	size_t i;
7031 
7032 	fprintf(fp, "commands:");
7033 	for (i = 0; i < nitems(tog_commands); i++) {
7034 		const struct tog_cmd *cmd = &tog_commands[i];
7035 		fprintf(fp, " %s", cmd->name);
7036 	}
7037 	fputc('\n', fp);
7038 }
7039 
7040 __dead static void
7041 usage(int hflag, int status)
7042 {
7043 	FILE *fp = (status == 0) ? stdout : stderr;
7044 
7045 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
7046 	    getprogname());
7047 	if (hflag) {
7048 		fprintf(fp, "lazy usage: %s path\n", getprogname());
7049 		list_commands(fp);
7050 	}
7051 	exit(status);
7052 }
7053 
7054 static char **
7055 make_argv(int argc, ...)
7056 {
7057 	va_list ap;
7058 	char **argv;
7059 	int i;
7060 
7061 	va_start(ap, argc);
7062 
7063 	argv = calloc(argc, sizeof(char *));
7064 	if (argv == NULL)
7065 		err(1, "calloc");
7066 	for (i = 0; i < argc; i++) {
7067 		argv[i] = strdup(va_arg(ap, char *));
7068 		if (argv[i] == NULL)
7069 			err(1, "strdup");
7070 	}
7071 
7072 	va_end(ap);
7073 	return argv;
7074 }
7075 
7076 /*
7077  * Try to convert 'tog path' into a 'tog log path' command.
7078  * The user could simply have mistyped the command rather than knowingly
7079  * provided a path. So check whether argv[0] can in fact be resolved
7080  * to a path in the HEAD commit and print a special error if not.
7081  * This hack is for mpi@ <3
7082  */
7083 static const struct got_error *
7084 tog_log_with_path(int argc, char *argv[])
7085 {
7086 	const struct got_error *error = NULL, *close_err;
7087 	const struct tog_cmd *cmd = NULL;
7088 	struct got_repository *repo = NULL;
7089 	struct got_worktree *worktree = NULL;
7090 	struct got_object_id *commit_id = NULL, *id = NULL;
7091 	struct got_commit_object *commit = NULL;
7092 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7093 	char *commit_id_str = NULL, **cmd_argv = NULL;
7094 	int *pack_fds = NULL;
7095 
7096 	cwd = getcwd(NULL, 0);
7097 	if (cwd == NULL)
7098 		return got_error_from_errno("getcwd");
7099 
7100 	error = got_repo_pack_fds_open(&pack_fds);
7101 	if (error != NULL)
7102 		goto done;
7103 
7104 	error = got_worktree_open(&worktree, cwd);
7105 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
7106 		goto done;
7107 
7108 	if (worktree)
7109 		repo_path = strdup(got_worktree_get_repo_path(worktree));
7110 	else
7111 		repo_path = strdup(cwd);
7112 	if (repo_path == NULL) {
7113 		error = got_error_from_errno("strdup");
7114 		goto done;
7115 	}
7116 
7117 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7118 	if (error != NULL)
7119 		goto done;
7120 
7121 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7122 	    repo, worktree);
7123 	if (error)
7124 		goto done;
7125 
7126 	error = tog_load_refs(repo, 0);
7127 	if (error)
7128 		goto done;
7129 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
7130 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
7131 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7132 	if (error)
7133 		goto done;
7134 
7135 	if (worktree) {
7136 		got_worktree_close(worktree);
7137 		worktree = NULL;
7138 	}
7139 
7140 	error = got_object_open_as_commit(&commit, repo, commit_id);
7141 	if (error)
7142 		goto done;
7143 
7144 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
7145 	if (error) {
7146 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
7147 			goto done;
7148 		fprintf(stderr, "%s: '%s' is no known command or path\n",
7149 		    getprogname(), argv[0]);
7150 		usage(1, 1);
7151 		/* not reached */
7152 	}
7153 
7154 	close_err = got_repo_close(repo);
7155 	if (error == NULL)
7156 		error = close_err;
7157 	repo = NULL;
7158 
7159 	error = got_object_id_str(&commit_id_str, commit_id);
7160 	if (error)
7161 		goto done;
7162 
7163 	cmd = &tog_commands[0]; /* log */
7164 	argc = 4;
7165 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
7166 	error = cmd->cmd_main(argc, cmd_argv);
7167 done:
7168 	if (repo) {
7169 		close_err = got_repo_close(repo);
7170 		if (error == NULL)
7171 			error = close_err;
7172 	}
7173 	if (commit)
7174 		got_object_commit_close(commit);
7175 	if (worktree)
7176 		got_worktree_close(worktree);
7177 	if (pack_fds) {
7178 		const struct got_error *pack_err =
7179 		    got_repo_pack_fds_close(pack_fds);
7180 		if (error == NULL)
7181 			error = pack_err;
7182 	}
7183 	free(id);
7184 	free(commit_id_str);
7185 	free(commit_id);
7186 	free(cwd);
7187 	free(repo_path);
7188 	free(in_repo_path);
7189 	if (cmd_argv) {
7190 		int i;
7191 		for (i = 0; i < argc; i++)
7192 			free(cmd_argv[i]);
7193 		free(cmd_argv);
7194 	}
7195 	tog_free_refs();
7196 	return error;
7197 }
7198 
7199 int
7200 main(int argc, char *argv[])
7201 {
7202 	const struct got_error *error = NULL;
7203 	const struct tog_cmd *cmd = NULL;
7204 	int ch, hflag = 0, Vflag = 0;
7205 	char **cmd_argv = NULL;
7206 	static const struct option longopts[] = {
7207 	    { "version", no_argument, NULL, 'V' },
7208 	    { NULL, 0, NULL, 0}
7209 	};
7210 
7211 	setlocale(LC_CTYPE, "");
7212 
7213 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
7214 		switch (ch) {
7215 		case 'h':
7216 			hflag = 1;
7217 			break;
7218 		case 'V':
7219 			Vflag = 1;
7220 			break;
7221 		default:
7222 			usage(hflag, 1);
7223 			/* NOTREACHED */
7224 		}
7225 	}
7226 
7227 	argc -= optind;
7228 	argv += optind;
7229 	optind = 1;
7230 	optreset = 1;
7231 
7232 	if (Vflag) {
7233 		got_version_print_str();
7234 		return 0;
7235 	}
7236 
7237 #ifndef PROFILE
7238 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
7239 	    NULL) == -1)
7240 		err(1, "pledge");
7241 #endif
7242 
7243 	if (argc == 0) {
7244 		if (hflag)
7245 			usage(hflag, 0);
7246 		/* Build an argument vector which runs a default command. */
7247 		cmd = &tog_commands[0];
7248 		argc = 1;
7249 		cmd_argv = make_argv(argc, cmd->name);
7250 	} else {
7251 		size_t i;
7252 
7253 		/* Did the user specify a command? */
7254 		for (i = 0; i < nitems(tog_commands); i++) {
7255 			if (strncmp(tog_commands[i].name, argv[0],
7256 			    strlen(argv[0])) == 0) {
7257 				cmd = &tog_commands[i];
7258 				break;
7259 			}
7260 		}
7261 	}
7262 
7263 	if (cmd == NULL) {
7264 		if (argc != 1)
7265 			usage(0, 1);
7266 		/* No command specified; try log with a path */
7267 		error = tog_log_with_path(argc, argv);
7268 	} else {
7269 		if (hflag)
7270 			cmd->cmd_usage();
7271 		else
7272 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
7273 	}
7274 
7275 	endwin();
7276 	putchar('\n');
7277 	if (cmd_argv) {
7278 		int i;
7279 		for (i = 0; i < argc; i++)
7280 			free(cmd_argv[i]);
7281 		free(cmd_argv);
7282 	}
7283 
7284 	if (error && error->code != GOT_ERR_CANCELLED)
7285 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
7286 	return 0;
7287 }