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