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__)
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 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 				err(1, "-C option %s", errstr);
3898 			break;
3899 		case 'r':
3900 			repo_path = realpath(optarg, NULL);
3901 			if (repo_path == NULL)
3902 				return got_error_from_errno2("realpath",
3903 				    optarg);
3904 			got_path_strip_trailing_slashes(repo_path);
3905 			break;
3906 		case 'w':
3907 			ignore_whitespace = 1;
3908 			break;
3909 		default:
3910 			usage_diff();
3911 			/* NOTREACHED */
3912 		}
3913 	}
3914 
3915 	argc -= optind;
3916 	argv += optind;
3917 
3918 	if (argc == 0) {
3919 		usage_diff(); /* TODO show local worktree changes */
3920 	} else if (argc == 2) {
3921 		id_str1 = argv[0];
3922 		id_str2 = argv[1];
3923 	} else
3924 		usage_diff();
3925 
3926 	if (repo_path == NULL) {
3927 		cwd = getcwd(NULL, 0);
3928 		if (cwd == NULL)
3929 			return got_error_from_errno("getcwd");
3930 		error = got_worktree_open(&worktree, cwd);
3931 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3932 			goto done;
3933 		if (worktree)
3934 			repo_path =
3935 			    strdup(got_worktree_get_repo_path(worktree));
3936 		else
3937 			repo_path = strdup(cwd);
3938 		if (repo_path == NULL) {
3939 			error = got_error_from_errno("strdup");
3940 			goto done;
3941 		}
3942 	}
3943 
3944 	error = got_repo_open(&repo, repo_path, NULL);
3945 	if (error)
3946 		goto done;
3947 
3948 	init_curses();
3949 
3950 	error = apply_unveil(got_repo_get_path(repo), NULL);
3951 	if (error)
3952 		goto done;
3953 
3954 	error = tog_load_refs(repo, 0);
3955 	if (error)
3956 		goto done;
3957 
3958 	error = got_repo_match_object_id(&id1, &label1, id_str1,
3959 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
3960 	if (error)
3961 		goto done;
3962 
3963 	error = got_repo_match_object_id(&id2, &label2, id_str2,
3964 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
3965 	if (error)
3966 		goto done;
3967 
3968 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
3969 	if (view == NULL) {
3970 		error = got_error_from_errno("view_open");
3971 		goto done;
3972 	}
3973 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
3974 	    ignore_whitespace, force_text_diff, NULL,  repo);
3975 	if (error)
3976 		goto done;
3977 	error = view_loop(view);
3978 done:
3979 	free(label1);
3980 	free(label2);
3981 	free(repo_path);
3982 	free(cwd);
3983 	if (repo) {
3984 		const struct got_error *close_err = got_repo_close(repo);
3985 		if (error == NULL)
3986 			error = close_err;
3987 	}
3988 	if (worktree)
3989 		got_worktree_close(worktree);
3990 	tog_free_refs();
3991 	return error;
3992 }
3993 
3994 __dead static void
3995 usage_blame(void)
3996 {
3997 	endwin();
3998 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
3999 	    getprogname());
4000 	exit(1);
4001 }
4002 
4003 struct tog_blame_line {
4004 	int annotated;
4005 	struct got_object_id *id;
4006 };
4007 
4008 static const struct got_error *
4009 draw_blame(struct tog_view *view)
4010 {
4011 	struct tog_blame_view_state *s = &view->state.blame;
4012 	struct tog_blame *blame = &s->blame;
4013 	regmatch_t *regmatch = &view->regmatch;
4014 	const struct got_error *err;
4015 	int lineno = 0, nprinted = 0;
4016 	char *line = NULL;
4017 	size_t linesize = 0;
4018 	ssize_t linelen;
4019 	wchar_t *wline;
4020 	int width;
4021 	struct tog_blame_line *blame_line;
4022 	struct got_object_id *prev_id = NULL;
4023 	char *id_str;
4024 	struct tog_color *tc;
4025 
4026 	err = got_object_id_str(&id_str, s->blamed_commit->id);
4027 	if (err)
4028 		return err;
4029 
4030 	rewind(blame->f);
4031 	werase(view->window);
4032 
4033 	if (asprintf(&line, "commit %s", id_str) == -1) {
4034 		err = got_error_from_errno("asprintf");
4035 		free(id_str);
4036 		return err;
4037 	}
4038 
4039 	err = format_line(&wline, &width, line, view->ncols, 0);
4040 	free(line);
4041 	line = NULL;
4042 	if (err)
4043 		return err;
4044 	if (view_needs_focus_indication(view))
4045 		wstandout(view->window);
4046 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4047 	if (tc)
4048 		wattr_on(view->window,
4049 		    COLOR_PAIR(tc->colorpair), NULL);
4050 	waddwstr(view->window, wline);
4051 	if (tc)
4052 		wattr_off(view->window,
4053 		    COLOR_PAIR(tc->colorpair), NULL);
4054 	if (view_needs_focus_indication(view))
4055 		wstandend(view->window);
4056 	free(wline);
4057 	wline = NULL;
4058 	if (width < view->ncols - 1)
4059 		waddch(view->window, '\n');
4060 
4061 	if (asprintf(&line, "[%d/%d] %s%s",
4062 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
4063 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
4064 		free(id_str);
4065 		return got_error_from_errno("asprintf");
4066 	}
4067 	free(id_str);
4068 	err = format_line(&wline, &width, line, view->ncols, 0);
4069 	free(line);
4070 	line = NULL;
4071 	if (err)
4072 		return err;
4073 	waddwstr(view->window, wline);
4074 	free(wline);
4075 	wline = NULL;
4076 	if (width < view->ncols - 1)
4077 		waddch(view->window, '\n');
4078 
4079 	s->eof = 0;
4080 	while (nprinted < view->nlines - 2) {
4081 		linelen = getline(&line, &linesize, blame->f);
4082 		if (linelen == -1) {
4083 			if (feof(blame->f)) {
4084 				s->eof = 1;
4085 				break;
4086 			}
4087 			free(line);
4088 			return got_ferror(blame->f, GOT_ERR_IO);
4089 		}
4090 		if (++lineno < s->first_displayed_line)
4091 			continue;
4092 
4093 		if (view->focussed && nprinted == s->selected_line - 1)
4094 			wstandout(view->window);
4095 
4096 		if (blame->nlines > 0) {
4097 			blame_line = &blame->lines[lineno - 1];
4098 			if (blame_line->annotated && prev_id &&
4099 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
4100 			    !(view->focussed &&
4101 			    nprinted == s->selected_line - 1)) {
4102 				waddstr(view->window, "        ");
4103 			} else if (blame_line->annotated) {
4104 				char *id_str;
4105 				err = got_object_id_str(&id_str, blame_line->id);
4106 				if (err) {
4107 					free(line);
4108 					return err;
4109 				}
4110 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4111 				if (tc)
4112 					wattr_on(view->window,
4113 					    COLOR_PAIR(tc->colorpair), NULL);
4114 				wprintw(view->window, "%.8s", id_str);
4115 				if (tc)
4116 					wattr_off(view->window,
4117 					    COLOR_PAIR(tc->colorpair), NULL);
4118 				free(id_str);
4119 				prev_id = blame_line->id;
4120 			} else {
4121 				waddstr(view->window, "........");
4122 				prev_id = NULL;
4123 			}
4124 		} else {
4125 			waddstr(view->window, "........");
4126 			prev_id = NULL;
4127 		}
4128 
4129 		if (view->focussed && nprinted == s->selected_line - 1)
4130 			wstandend(view->window);
4131 		waddstr(view->window, " ");
4132 
4133 		if (view->ncols <= 9) {
4134 			width = 9;
4135 			wline = wcsdup(L"");
4136 			if (wline == NULL) {
4137 				err = got_error_from_errno("wcsdup");
4138 				free(line);
4139 				return err;
4140 			}
4141 		} else if (s->first_displayed_line + nprinted ==
4142 		    s->matched_line &&
4143 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4144 			err = add_matched_line(&width, line, view->ncols - 9, 9,
4145 			    view->window, regmatch);
4146 			if (err) {
4147 				free(line);
4148 				return err;
4149 			}
4150 			width += 9;
4151 		} else {
4152 			err = format_line(&wline, &width, line,
4153 			    view->ncols - 9, 9);
4154 			waddwstr(view->window, wline);
4155 			free(wline);
4156 			wline = NULL;
4157 			width += 9;
4158 		}
4159 
4160 		if (width <= view->ncols - 1)
4161 			waddch(view->window, '\n');
4162 		if (++nprinted == 1)
4163 			s->first_displayed_line = lineno;
4164 	}
4165 	free(line);
4166 	s->last_displayed_line = lineno;
4167 
4168 	view_vborder(view);
4169 
4170 	return NULL;
4171 }
4172 
4173 static const struct got_error *
4174 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
4175 {
4176 	const struct got_error *err = NULL;
4177 	struct tog_blame_cb_args *a = arg;
4178 	struct tog_blame_line *line;
4179 	int errcode;
4180 
4181 	if (nlines != a->nlines ||
4182 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
4183 		return got_error(GOT_ERR_RANGE);
4184 
4185 	errcode = pthread_mutex_lock(&tog_mutex);
4186 	if (errcode)
4187 		return got_error_set_errno(errcode, "pthread_mutex_lock");
4188 
4189 	if (*a->quit) {	/* user has quit the blame view */
4190 		err = got_error(GOT_ERR_ITER_COMPLETED);
4191 		goto done;
4192 	}
4193 
4194 	if (lineno == -1)
4195 		goto done; /* no change in this commit */
4196 
4197 	line = &a->lines[lineno - 1];
4198 	if (line->annotated)
4199 		goto done;
4200 
4201 	line->id = got_object_id_dup(id);
4202 	if (line->id == NULL) {
4203 		err = got_error_from_errno("got_object_id_dup");
4204 		goto done;
4205 	}
4206 	line->annotated = 1;
4207 done:
4208 	errcode = pthread_mutex_unlock(&tog_mutex);
4209 	if (errcode)
4210 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4211 	return err;
4212 }
4213 
4214 static void *
4215 blame_thread(void *arg)
4216 {
4217 	const struct got_error *err, *close_err;
4218 	struct tog_blame_thread_args *ta = arg;
4219 	struct tog_blame_cb_args *a = ta->cb_args;
4220 	int errcode;
4221 
4222 	err = block_signals_used_by_main_thread();
4223 	if (err)
4224 		return (void *)err;
4225 
4226 	err = got_blame(ta->path, a->commit_id, ta->repo,
4227 	    blame_cb, ta->cb_args, ta->cancel_cb, ta->cancel_arg);
4228 	if (err && err->code == GOT_ERR_CANCELLED)
4229 		err = NULL;
4230 
4231 	errcode = pthread_mutex_lock(&tog_mutex);
4232 	if (errcode)
4233 		return (void *)got_error_set_errno(errcode,
4234 		    "pthread_mutex_lock");
4235 
4236 	close_err = got_repo_close(ta->repo);
4237 	if (err == NULL)
4238 		err = close_err;
4239 	ta->repo = NULL;
4240 	*ta->complete = 1;
4241 
4242 	errcode = pthread_mutex_unlock(&tog_mutex);
4243 	if (errcode && err == NULL)
4244 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4245 
4246 	return (void *)err;
4247 }
4248 
4249 static struct got_object_id *
4250 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
4251     int first_displayed_line, int selected_line)
4252 {
4253 	struct tog_blame_line *line;
4254 
4255 	if (nlines <= 0)
4256 		return NULL;
4257 
4258 	line = &lines[first_displayed_line - 1 + selected_line - 1];
4259 	if (!line->annotated)
4260 		return NULL;
4261 
4262 	return line->id;
4263 }
4264 
4265 static const struct got_error *
4266 stop_blame(struct tog_blame *blame)
4267 {
4268 	const struct got_error *err = NULL;
4269 	int i;
4270 
4271 	if (blame->thread) {
4272 		int errcode;
4273 		errcode = pthread_mutex_unlock(&tog_mutex);
4274 		if (errcode)
4275 			return got_error_set_errno(errcode,
4276 			    "pthread_mutex_unlock");
4277 		errcode = pthread_join(blame->thread, (void **)&err);
4278 		if (errcode)
4279 			return got_error_set_errno(errcode, "pthread_join");
4280 		errcode = pthread_mutex_lock(&tog_mutex);
4281 		if (errcode)
4282 			return got_error_set_errno(errcode,
4283 			    "pthread_mutex_lock");
4284 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
4285 			err = NULL;
4286 		blame->thread = 0; //NULL;
4287 	}
4288 	if (blame->thread_args.repo) {
4289 		const struct got_error *close_err;
4290 		close_err = got_repo_close(blame->thread_args.repo);
4291 		if (err == NULL)
4292 			err = close_err;
4293 		blame->thread_args.repo = NULL;
4294 	}
4295 	if (blame->f) {
4296 		if (fclose(blame->f) == EOF && err == NULL)
4297 			err = got_error_from_errno("fclose");
4298 		blame->f = NULL;
4299 	}
4300 	if (blame->lines) {
4301 		for (i = 0; i < blame->nlines; i++)
4302 			free(blame->lines[i].id);
4303 		free(blame->lines);
4304 		blame->lines = NULL;
4305 	}
4306 	free(blame->cb_args.commit_id);
4307 	blame->cb_args.commit_id = NULL;
4308 
4309 	return err;
4310 }
4311 
4312 static const struct got_error *
4313 cancel_blame_view(void *arg)
4314 {
4315 	const struct got_error *err = NULL;
4316 	int *done = arg;
4317 	int errcode;
4318 
4319 	errcode = pthread_mutex_lock(&tog_mutex);
4320 	if (errcode)
4321 		return got_error_set_errno(errcode,
4322 		    "pthread_mutex_unlock");
4323 
4324 	if (*done)
4325 		err = got_error(GOT_ERR_CANCELLED);
4326 
4327 	errcode = pthread_mutex_unlock(&tog_mutex);
4328 	if (errcode)
4329 		return got_error_set_errno(errcode,
4330 		    "pthread_mutex_lock");
4331 
4332 	return err;
4333 }
4334 
4335 static const struct got_error *
4336 run_blame(struct tog_view *view)
4337 {
4338 	struct tog_blame_view_state *s = &view->state.blame;
4339 	struct tog_blame *blame = &s->blame;
4340 	const struct got_error *err = NULL;
4341 	struct got_blob_object *blob = NULL;
4342 	struct got_repository *thread_repo = NULL;
4343 	struct got_object_id *obj_id = NULL;
4344 	int obj_type;
4345 
4346 	err = got_object_id_by_path(&obj_id, s->repo, s->blamed_commit->id,
4347 	    s->path);
4348 	if (err)
4349 		return err;
4350 
4351 	err = got_object_get_type(&obj_type, s->repo, obj_id);
4352 	if (err)
4353 		goto done;
4354 
4355 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
4356 		err = got_error(GOT_ERR_OBJ_TYPE);
4357 		goto done;
4358 	}
4359 
4360 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192);
4361 	if (err)
4362 		goto done;
4363 	blame->f = got_opentemp();
4364 	if (blame->f == NULL) {
4365 		err = got_error_from_errno("got_opentemp");
4366 		goto done;
4367 	}
4368 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
4369 	    &blame->line_offsets, blame->f, blob);
4370 	if (err)
4371 		goto done;
4372 	if (blame->nlines == 0) {
4373 		s->blame_complete = 1;
4374 		goto done;
4375 	}
4376 
4377 	/* Don't include \n at EOF in the blame line count. */
4378 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
4379 		blame->nlines--;
4380 
4381 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
4382 	if (blame->lines == NULL) {
4383 		err = got_error_from_errno("calloc");
4384 		goto done;
4385 	}
4386 
4387 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL);
4388 	if (err)
4389 		goto done;
4390 
4391 	blame->cb_args.view = view;
4392 	blame->cb_args.lines = blame->lines;
4393 	blame->cb_args.nlines = blame->nlines;
4394 	blame->cb_args.commit_id = got_object_id_dup(s->blamed_commit->id);
4395 	if (blame->cb_args.commit_id == NULL) {
4396 		err = got_error_from_errno("got_object_id_dup");
4397 		goto done;
4398 	}
4399 	blame->cb_args.quit = &s->done;
4400 
4401 	blame->thread_args.path = s->path;
4402 	blame->thread_args.repo = thread_repo;
4403 	blame->thread_args.cb_args = &blame->cb_args;
4404 	blame->thread_args.complete = &s->blame_complete;
4405 	blame->thread_args.cancel_cb = cancel_blame_view;
4406 	blame->thread_args.cancel_arg = &s->done;
4407 	s->blame_complete = 0;
4408 
4409 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
4410 		s->first_displayed_line = 1;
4411 		s->last_displayed_line = view->nlines;
4412 		s->selected_line = 1;
4413 	}
4414 	s->matched_line = 0;
4415 
4416 done:
4417 	if (blob)
4418 		got_object_blob_close(blob);
4419 	free(obj_id);
4420 	if (err)
4421 		stop_blame(blame);
4422 	return err;
4423 }
4424 
4425 static const struct got_error *
4426 open_blame_view(struct tog_view *view, char *path,
4427     struct got_object_id *commit_id, struct got_repository *repo)
4428 {
4429 	const struct got_error *err = NULL;
4430 	struct tog_blame_view_state *s = &view->state.blame;
4431 
4432 	STAILQ_INIT(&s->blamed_commits);
4433 
4434 	s->path = strdup(path);
4435 	if (s->path == NULL)
4436 		return got_error_from_errno("strdup");
4437 
4438 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
4439 	if (err) {
4440 		free(s->path);
4441 		return err;
4442 	}
4443 
4444 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
4445 	s->first_displayed_line = 1;
4446 	s->last_displayed_line = view->nlines;
4447 	s->selected_line = 1;
4448 	s->blame_complete = 0;
4449 	s->repo = repo;
4450 	s->commit_id = commit_id;
4451 	memset(&s->blame, 0, sizeof(s->blame));
4452 
4453 	STAILQ_INIT(&s->colors);
4454 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4455 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
4456 		    get_color_value("TOG_COLOR_COMMIT"));
4457 		if (err)
4458 			return err;
4459 	}
4460 
4461 	view->show = show_blame_view;
4462 	view->input = input_blame_view;
4463 	view->close = close_blame_view;
4464 	view->search_start = search_start_blame_view;
4465 	view->search_next = search_next_blame_view;
4466 
4467 	return run_blame(view);
4468 }
4469 
4470 static const struct got_error *
4471 close_blame_view(struct tog_view *view)
4472 {
4473 	const struct got_error *err = NULL;
4474 	struct tog_blame_view_state *s = &view->state.blame;
4475 
4476 	if (s->blame.thread)
4477 		err = stop_blame(&s->blame);
4478 
4479 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
4480 		struct got_object_qid *blamed_commit;
4481 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
4482 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
4483 		got_object_qid_free(blamed_commit);
4484 	}
4485 
4486 	free(s->path);
4487 	free_colors(&s->colors);
4488 
4489 	return err;
4490 }
4491 
4492 static const struct got_error *
4493 search_start_blame_view(struct tog_view *view)
4494 {
4495 	struct tog_blame_view_state *s = &view->state.blame;
4496 
4497 	s->matched_line = 0;
4498 	return NULL;
4499 }
4500 
4501 static const struct got_error *
4502 search_next_blame_view(struct tog_view *view)
4503 {
4504 	struct tog_blame_view_state *s = &view->state.blame;
4505 	int lineno;
4506 	char *line = NULL;
4507 	size_t linesize = 0;
4508 	ssize_t linelen;
4509 
4510 	if (!view->searching) {
4511 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4512 		return NULL;
4513 	}
4514 
4515 	if (s->matched_line) {
4516 		if (view->searching == TOG_SEARCH_FORWARD)
4517 			lineno = s->matched_line + 1;
4518 		else
4519 			lineno = s->matched_line - 1;
4520 	} else
4521 		lineno = s->first_displayed_line - 1 + s->selected_line;
4522 
4523 	while (1) {
4524 		off_t offset;
4525 
4526 		if (lineno <= 0 || lineno > s->blame.nlines) {
4527 			if (s->matched_line == 0) {
4528 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4529 				break;
4530 			}
4531 
4532 			if (view->searching == TOG_SEARCH_FORWARD)
4533 				lineno = 1;
4534 			else
4535 				lineno = s->blame.nlines;
4536 		}
4537 
4538 		offset = s->blame.line_offsets[lineno - 1];
4539 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
4540 			free(line);
4541 			return got_error_from_errno("fseeko");
4542 		}
4543 		linelen = getline(&line, &linesize, s->blame.f);
4544 		if (linelen != -1 &&
4545 		    match_line(line, &view->regex, 1, &view->regmatch)) {
4546 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
4547 			s->matched_line = lineno;
4548 			break;
4549 		}
4550 		if (view->searching == TOG_SEARCH_FORWARD)
4551 			lineno++;
4552 		else
4553 			lineno--;
4554 	}
4555 	free(line);
4556 
4557 	if (s->matched_line) {
4558 		s->first_displayed_line = s->matched_line;
4559 		s->selected_line = 1;
4560 	}
4561 
4562 	return NULL;
4563 }
4564 
4565 static const struct got_error *
4566 show_blame_view(struct tog_view *view)
4567 {
4568 	const struct got_error *err = NULL;
4569 	struct tog_blame_view_state *s = &view->state.blame;
4570 	int errcode;
4571 
4572 	if (s->blame.thread == 0 && !s->blame_complete) {
4573 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
4574 		    &s->blame.thread_args);
4575 		if (errcode)
4576 			return got_error_set_errno(errcode, "pthread_create");
4577 
4578 		halfdelay(1); /* fast refresh while annotating  */
4579 	}
4580 
4581 	if (s->blame_complete)
4582 		halfdelay(10); /* disable fast refresh */
4583 
4584 	err = draw_blame(view);
4585 
4586 	view_vborder(view);
4587 	return err;
4588 }
4589 
4590 static const struct got_error *
4591 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
4592 {
4593 	const struct got_error *err = NULL, *thread_err = NULL;
4594 	struct tog_view *diff_view;
4595 	struct tog_blame_view_state *s = &view->state.blame;
4596 	int begin_x = 0;
4597 
4598 	switch (ch) {
4599 	case 'q':
4600 		s->done = 1;
4601 		break;
4602 	case 'g':
4603 	case KEY_HOME:
4604 		s->selected_line = 1;
4605 		s->first_displayed_line = 1;
4606 		break;
4607 	case 'G':
4608 	case KEY_END:
4609 		if (s->blame.nlines < view->nlines - 2) {
4610 			s->selected_line = s->blame.nlines;
4611 			s->first_displayed_line = 1;
4612 		} else {
4613 			s->selected_line = view->nlines - 2;
4614 			s->first_displayed_line = s->blame.nlines -
4615 			    (view->nlines - 3);
4616 		}
4617 		break;
4618 	case 'k':
4619 	case KEY_UP:
4620 	case CTRL('p'):
4621 		if (s->selected_line > 1)
4622 			s->selected_line--;
4623 		else if (s->selected_line == 1 &&
4624 		    s->first_displayed_line > 1)
4625 			s->first_displayed_line--;
4626 		break;
4627 	case KEY_PPAGE:
4628 	case CTRL('b'):
4629 		if (s->first_displayed_line == 1) {
4630 			s->selected_line = 1;
4631 			break;
4632 		}
4633 		if (s->first_displayed_line > view->nlines - 2)
4634 			s->first_displayed_line -=
4635 			    (view->nlines - 2);
4636 		else
4637 			s->first_displayed_line = 1;
4638 		break;
4639 	case 'j':
4640 	case KEY_DOWN:
4641 	case CTRL('n'):
4642 		if (s->selected_line < view->nlines - 2 &&
4643 		    s->first_displayed_line +
4644 		    s->selected_line <= s->blame.nlines)
4645 			s->selected_line++;
4646 		else if (s->last_displayed_line <
4647 		    s->blame.nlines)
4648 			s->first_displayed_line++;
4649 		break;
4650 	case 'b':
4651 	case 'p': {
4652 		struct got_object_id *id = NULL;
4653 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
4654 		    s->first_displayed_line, s->selected_line);
4655 		if (id == NULL)
4656 			break;
4657 		if (ch == 'p') {
4658 			struct got_commit_object *commit;
4659 			struct got_object_qid *pid;
4660 			struct got_object_id *blob_id = NULL;
4661 			int obj_type;
4662 			err = got_object_open_as_commit(&commit,
4663 			    s->repo, id);
4664 			if (err)
4665 				break;
4666 			pid = STAILQ_FIRST(
4667 			    got_object_commit_get_parent_ids(commit));
4668 			if (pid == NULL) {
4669 				got_object_commit_close(commit);
4670 				break;
4671 			}
4672 			/* Check if path history ends here. */
4673 			err = got_object_id_by_path(&blob_id, s->repo,
4674 			    pid->id, s->path);
4675 			if (err) {
4676 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
4677 					err = NULL;
4678 				got_object_commit_close(commit);
4679 				break;
4680 			}
4681 			err = got_object_get_type(&obj_type, s->repo,
4682 			    blob_id);
4683 			free(blob_id);
4684 			/* Can't blame non-blob type objects. */
4685 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
4686 				got_object_commit_close(commit);
4687 				break;
4688 			}
4689 			err = got_object_qid_alloc(&s->blamed_commit,
4690 			    pid->id);
4691 			got_object_commit_close(commit);
4692 		} else {
4693 			if (got_object_id_cmp(id,
4694 			    s->blamed_commit->id) == 0)
4695 				break;
4696 			err = got_object_qid_alloc(&s->blamed_commit,
4697 			    id);
4698 		}
4699 		if (err)
4700 			break;
4701 		s->done = 1;
4702 		thread_err = stop_blame(&s->blame);
4703 		s->done = 0;
4704 		if (thread_err)
4705 			break;
4706 		STAILQ_INSERT_HEAD(&s->blamed_commits,
4707 		    s->blamed_commit, entry);
4708 		err = run_blame(view);
4709 		if (err)
4710 			break;
4711 		break;
4712 	}
4713 	case 'B': {
4714 		struct got_object_qid *first;
4715 		first = STAILQ_FIRST(&s->blamed_commits);
4716 		if (!got_object_id_cmp(first->id, s->commit_id))
4717 			break;
4718 		s->done = 1;
4719 		thread_err = stop_blame(&s->blame);
4720 		s->done = 0;
4721 		if (thread_err)
4722 			break;
4723 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
4724 		got_object_qid_free(s->blamed_commit);
4725 		s->blamed_commit =
4726 		    STAILQ_FIRST(&s->blamed_commits);
4727 		err = run_blame(view);
4728 		if (err)
4729 			break;
4730 		break;
4731 	}
4732 	case KEY_ENTER:
4733 	case '\r': {
4734 		struct got_object_id *id = NULL;
4735 		struct got_object_qid *pid;
4736 		struct got_commit_object *commit = NULL;
4737 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
4738 		    s->first_displayed_line, s->selected_line);
4739 		if (id == NULL)
4740 			break;
4741 		err = got_object_open_as_commit(&commit, s->repo, id);
4742 		if (err)
4743 			break;
4744 		pid = STAILQ_FIRST(
4745 		    got_object_commit_get_parent_ids(commit));
4746 		if (view_is_parent_view(view))
4747 		    begin_x = view_split_begin_x(view->begin_x);
4748 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
4749 		if (diff_view == NULL) {
4750 			got_object_commit_close(commit);
4751 			err = got_error_from_errno("view_open");
4752 			break;
4753 		}
4754 		err = open_diff_view(diff_view, pid ? pid->id : NULL,
4755 		    id, NULL, NULL, 3, 0, 0, NULL, s->repo);
4756 		got_object_commit_close(commit);
4757 		if (err) {
4758 			view_close(diff_view);
4759 			break;
4760 		}
4761 		view->focussed = 0;
4762 		diff_view->focussed = 1;
4763 		if (view_is_parent_view(view)) {
4764 			err = view_close_child(view);
4765 			if (err)
4766 				break;
4767 			view_set_child(view, diff_view);
4768 			view->focus_child = 1;
4769 		} else
4770 			*new_view = diff_view;
4771 		if (err)
4772 			break;
4773 		break;
4774 	}
4775 	case KEY_NPAGE:
4776 	case CTRL('f'):
4777 	case ' ':
4778 		if (s->last_displayed_line >= s->blame.nlines &&
4779 		    s->selected_line >= MIN(s->blame.nlines,
4780 		    view->nlines - 2)) {
4781 			break;
4782 		}
4783 		if (s->last_displayed_line >= s->blame.nlines &&
4784 		    s->selected_line < view->nlines - 2) {
4785 			s->selected_line = MIN(s->blame.nlines,
4786 			    view->nlines - 2);
4787 			break;
4788 		}
4789 		if (s->last_displayed_line + view->nlines - 2
4790 		    <= s->blame.nlines)
4791 			s->first_displayed_line +=
4792 			    view->nlines - 2;
4793 		else
4794 			s->first_displayed_line =
4795 			    s->blame.nlines -
4796 			    (view->nlines - 3);
4797 		break;
4798 	case KEY_RESIZE:
4799 		if (s->selected_line > view->nlines - 2) {
4800 			s->selected_line = MIN(s->blame.nlines,
4801 			    view->nlines - 2);
4802 		}
4803 		break;
4804 	default:
4805 		break;
4806 	}
4807 	return thread_err ? thread_err : err;
4808 }
4809 
4810 static const struct got_error *
4811 cmd_blame(int argc, char *argv[])
4812 {
4813 	const struct got_error *error;
4814 	struct got_repository *repo = NULL;
4815 	struct got_worktree *worktree = NULL;
4816 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
4817 	char *link_target = NULL;
4818 	struct got_object_id *commit_id = NULL;
4819 	char *commit_id_str = NULL;
4820 	int ch;
4821 	struct tog_view *view;
4822 
4823 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
4824 		switch (ch) {
4825 		case 'c':
4826 			commit_id_str = optarg;
4827 			break;
4828 		case 'r':
4829 			repo_path = realpath(optarg, NULL);
4830 			if (repo_path == NULL)
4831 				return got_error_from_errno2("realpath",
4832 				    optarg);
4833 			break;
4834 		default:
4835 			usage_blame();
4836 			/* NOTREACHED */
4837 		}
4838 	}
4839 
4840 	argc -= optind;
4841 	argv += optind;
4842 
4843 	if (argc != 1)
4844 		usage_blame();
4845 
4846 	if (repo_path == NULL) {
4847 		cwd = getcwd(NULL, 0);
4848 		if (cwd == NULL)
4849 			return got_error_from_errno("getcwd");
4850 		error = got_worktree_open(&worktree, cwd);
4851 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4852 			goto done;
4853 		if (worktree)
4854 			repo_path =
4855 			    strdup(got_worktree_get_repo_path(worktree));
4856 		else
4857 			repo_path = strdup(cwd);
4858 		if (repo_path == NULL) {
4859 			error = got_error_from_errno("strdup");
4860 			goto done;
4861 		}
4862 	}
4863 
4864 	error = got_repo_open(&repo, repo_path, NULL);
4865 	if (error != NULL)
4866 		goto done;
4867 
4868 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
4869 	    worktree);
4870 	if (error)
4871 		goto done;
4872 
4873 	init_curses();
4874 
4875 	error = apply_unveil(got_repo_get_path(repo), NULL);
4876 	if (error)
4877 		goto done;
4878 
4879 	error = tog_load_refs(repo, 0);
4880 	if (error)
4881 		goto done;
4882 
4883 	if (commit_id_str == NULL) {
4884 		struct got_reference *head_ref;
4885 		error = got_ref_open(&head_ref, repo, worktree ?
4886 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
4887 		if (error != NULL)
4888 			goto done;
4889 		error = got_ref_resolve(&commit_id, repo, head_ref);
4890 		got_ref_close(head_ref);
4891 	} else {
4892 		error = got_repo_match_object_id(&commit_id, NULL,
4893 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4894 	}
4895 	if (error != NULL)
4896 		goto done;
4897 
4898 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
4899 	if (view == NULL) {
4900 		error = got_error_from_errno("view_open");
4901 		goto done;
4902 	}
4903 
4904 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
4905 	    commit_id, repo);
4906 	if (error)
4907 		goto done;
4908 
4909 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
4910 	    commit_id, repo);
4911 	if (error)
4912 		goto done;
4913 	if (worktree) {
4914 		/* Release work tree lock. */
4915 		got_worktree_close(worktree);
4916 		worktree = NULL;
4917 	}
4918 	error = view_loop(view);
4919 done:
4920 	free(repo_path);
4921 	free(in_repo_path);
4922 	free(link_target);
4923 	free(cwd);
4924 	free(commit_id);
4925 	if (worktree)
4926 		got_worktree_close(worktree);
4927 	if (repo) {
4928 		const struct got_error *close_err = got_repo_close(repo);
4929 		if (error == NULL)
4930 			error = close_err;
4931 	}
4932 	tog_free_refs();
4933 	return error;
4934 }
4935 
4936 static const struct got_error *
4937 draw_tree_entries(struct tog_view *view, const char *parent_path)
4938 {
4939 	struct tog_tree_view_state *s = &view->state.tree;
4940 	const struct got_error *err = NULL;
4941 	struct got_tree_entry *te;
4942 	wchar_t *wline;
4943 	struct tog_color *tc;
4944 	int width, n, i, nentries;
4945 	int limit = view->nlines;
4946 
4947 	s->ndisplayed = 0;
4948 
4949 	werase(view->window);
4950 
4951 	if (limit == 0)
4952 		return NULL;
4953 
4954 	err = format_line(&wline, &width, s->tree_label, view->ncols, 0);
4955 	if (err)
4956 		return err;
4957 	if (view_needs_focus_indication(view))
4958 		wstandout(view->window);
4959 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4960 	if (tc)
4961 		wattr_on(view->window,
4962 		    COLOR_PAIR(tc->colorpair), NULL);
4963 	waddwstr(view->window, wline);
4964 	if (tc)
4965 		wattr_off(view->window,
4966 		    COLOR_PAIR(tc->colorpair), NULL);
4967 	if (view_needs_focus_indication(view))
4968 		wstandend(view->window);
4969 	free(wline);
4970 	wline = NULL;
4971 	if (width < view->ncols - 1)
4972 		waddch(view->window, '\n');
4973 	if (--limit <= 0)
4974 		return NULL;
4975 	err = format_line(&wline, &width, parent_path, view->ncols, 0);
4976 	if (err)
4977 		return err;
4978 	waddwstr(view->window, wline);
4979 	free(wline);
4980 	wline = NULL;
4981 	if (width < view->ncols - 1)
4982 		waddch(view->window, '\n');
4983 	if (--limit <= 0)
4984 		return NULL;
4985 	waddch(view->window, '\n');
4986 	if (--limit <= 0)
4987 		return NULL;
4988 
4989 	if (s->first_displayed_entry == NULL) {
4990 		te = got_object_tree_get_first_entry(s->tree);
4991 		if (s->selected == 0) {
4992 			if (view->focussed)
4993 				wstandout(view->window);
4994 			s->selected_entry = NULL;
4995 		}
4996 		waddstr(view->window, "  ..\n");	/* parent directory */
4997 		if (s->selected == 0 && view->focussed)
4998 			wstandend(view->window);
4999 		s->ndisplayed++;
5000 		if (--limit <= 0)
5001 			return NULL;
5002 		n = 1;
5003 	} else {
5004 		n = 0;
5005 		te = s->first_displayed_entry;
5006 	}
5007 
5008 	nentries = got_object_tree_get_nentries(s->tree);
5009 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
5010 		char *line = NULL, *id_str = NULL, *link_target = NULL;
5011 		const char *modestr = "";
5012 		mode_t mode;
5013 
5014 		te = got_object_tree_get_entry(s->tree, i);
5015 		mode = got_tree_entry_get_mode(te);
5016 
5017 		if (s->show_ids) {
5018 			err = got_object_id_str(&id_str,
5019 			    got_tree_entry_get_id(te));
5020 			if (err)
5021 				return got_error_from_errno(
5022 				    "got_object_id_str");
5023 		}
5024 		if (got_object_tree_entry_is_submodule(te))
5025 			modestr = "$";
5026 		else if (S_ISLNK(mode)) {
5027 			int i;
5028 
5029 			err = got_tree_entry_get_symlink_target(&link_target,
5030 			    te, s->repo);
5031 			if (err) {
5032 				free(id_str);
5033 				return err;
5034 			}
5035 			for (i = 0; i < strlen(link_target); i++) {
5036 				if (!isprint((unsigned char)link_target[i]))
5037 					link_target[i] = '?';
5038 			}
5039 			modestr = "@";
5040 		}
5041 		else if (S_ISDIR(mode))
5042 			modestr = "/";
5043 		else if (mode & S_IXUSR)
5044 			modestr = "*";
5045 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
5046 		    got_tree_entry_get_name(te), modestr,
5047 		    link_target ? " -> ": "",
5048 		    link_target ? link_target : "") == -1) {
5049 			free(id_str);
5050 			free(link_target);
5051 			return got_error_from_errno("asprintf");
5052 		}
5053 		free(id_str);
5054 		free(link_target);
5055 		err = format_line(&wline, &width, line, view->ncols, 0);
5056 		if (err) {
5057 			free(line);
5058 			break;
5059 		}
5060 		if (n == s->selected) {
5061 			if (view->focussed)
5062 				wstandout(view->window);
5063 			s->selected_entry = te;
5064 		}
5065 		tc = match_color(&s->colors, line);
5066 		if (tc)
5067 			wattr_on(view->window,
5068 			    COLOR_PAIR(tc->colorpair), NULL);
5069 		waddwstr(view->window, wline);
5070 		if (tc)
5071 			wattr_off(view->window,
5072 			    COLOR_PAIR(tc->colorpair), NULL);
5073 		if (width < view->ncols - 1)
5074 			waddch(view->window, '\n');
5075 		if (n == s->selected && view->focussed)
5076 			wstandend(view->window);
5077 		free(line);
5078 		free(wline);
5079 		wline = NULL;
5080 		n++;
5081 		s->ndisplayed++;
5082 		s->last_displayed_entry = te;
5083 		if (--limit <= 0)
5084 			break;
5085 	}
5086 
5087 	return err;
5088 }
5089 
5090 static void
5091 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
5092 {
5093 	struct got_tree_entry *te;
5094 	int isroot = s->tree == s->root;
5095 	int i = 0;
5096 
5097 	if (s->first_displayed_entry == NULL)
5098 		return;
5099 
5100 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
5101 	while (i++ < maxscroll) {
5102 		if (te == NULL) {
5103 			if (!isroot)
5104 				s->first_displayed_entry = NULL;
5105 			break;
5106 		}
5107 		s->first_displayed_entry = te;
5108 		te = got_tree_entry_get_prev(s->tree, te);
5109 	}
5110 }
5111 
5112 static void
5113 tree_scroll_down(struct tog_tree_view_state *s, int maxscroll)
5114 {
5115 	struct got_tree_entry *next, *last;
5116 	int n = 0;
5117 
5118 	if (s->first_displayed_entry)
5119 		next = got_tree_entry_get_next(s->tree,
5120 		    s->first_displayed_entry);
5121 	else
5122 		next = got_object_tree_get_first_entry(s->tree);
5123 
5124 	last = s->last_displayed_entry;
5125 	while (next && last && n++ < maxscroll) {
5126 		last = got_tree_entry_get_next(s->tree, last);
5127 		if (last) {
5128 			s->first_displayed_entry = next;
5129 			next = got_tree_entry_get_next(s->tree, next);
5130 		}
5131 	}
5132 }
5133 
5134 static const struct got_error *
5135 tree_entry_path(char **path, struct tog_parent_trees *parents,
5136     struct got_tree_entry *te)
5137 {
5138 	const struct got_error *err = NULL;
5139 	struct tog_parent_tree *pt;
5140 	size_t len = 2; /* for leading slash and NUL */
5141 
5142 	TAILQ_FOREACH(pt, parents, entry)
5143 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
5144 		    + 1 /* slash */;
5145 	if (te)
5146 		len += strlen(got_tree_entry_get_name(te));
5147 
5148 	*path = calloc(1, len);
5149 	if (path == NULL)
5150 		return got_error_from_errno("calloc");
5151 
5152 	(*path)[0] = '/';
5153 	pt = TAILQ_LAST(parents, tog_parent_trees);
5154 	while (pt) {
5155 		const char *name = got_tree_entry_get_name(pt->selected_entry);
5156 		if (strlcat(*path, name, len) >= len) {
5157 			err = got_error(GOT_ERR_NO_SPACE);
5158 			goto done;
5159 		}
5160 		if (strlcat(*path, "/", len) >= len) {
5161 			err = got_error(GOT_ERR_NO_SPACE);
5162 			goto done;
5163 		}
5164 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
5165 	}
5166 	if (te) {
5167 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
5168 			err = got_error(GOT_ERR_NO_SPACE);
5169 			goto done;
5170 		}
5171 	}
5172 done:
5173 	if (err) {
5174 		free(*path);
5175 		*path = NULL;
5176 	}
5177 	return err;
5178 }
5179 
5180 static const struct got_error *
5181 blame_tree_entry(struct tog_view **new_view, int begin_x,
5182     struct got_tree_entry *te, struct tog_parent_trees *parents,
5183     struct got_object_id *commit_id, struct got_repository *repo)
5184 {
5185 	const struct got_error *err = NULL;
5186 	char *path;
5187 	struct tog_view *blame_view;
5188 
5189 	*new_view = NULL;
5190 
5191 	err = tree_entry_path(&path, parents, te);
5192 	if (err)
5193 		return err;
5194 
5195 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
5196 	if (blame_view == NULL) {
5197 		err = got_error_from_errno("view_open");
5198 		goto done;
5199 	}
5200 
5201 	err = open_blame_view(blame_view, path, commit_id, repo);
5202 	if (err) {
5203 		if (err->code == GOT_ERR_CANCELLED)
5204 			err = NULL;
5205 		view_close(blame_view);
5206 	} else
5207 		*new_view = blame_view;
5208 done:
5209 	free(path);
5210 	return err;
5211 }
5212 
5213 static const struct got_error *
5214 log_selected_tree_entry(struct tog_view **new_view, int begin_x,
5215     struct tog_tree_view_state *s)
5216 {
5217 	struct tog_view *log_view;
5218 	const struct got_error *err = NULL;
5219 	char *path;
5220 
5221 	*new_view = NULL;
5222 
5223 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
5224 	if (log_view == NULL)
5225 		return got_error_from_errno("view_open");
5226 
5227 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
5228 	if (err)
5229 		return err;
5230 
5231 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
5232 	    path, 0);
5233 	if (err)
5234 		view_close(log_view);
5235 	else
5236 		*new_view = log_view;
5237 	free(path);
5238 	return err;
5239 }
5240 
5241 static const struct got_error *
5242 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
5243     const char *head_ref_name, struct got_repository *repo)
5244 {
5245 	const struct got_error *err = NULL;
5246 	char *commit_id_str = NULL;
5247 	struct tog_tree_view_state *s = &view->state.tree;
5248 	struct got_commit_object *commit = NULL;
5249 
5250 	TAILQ_INIT(&s->parents);
5251 	STAILQ_INIT(&s->colors);
5252 
5253 	s->commit_id = got_object_id_dup(commit_id);
5254 	if (s->commit_id == NULL)
5255 		return got_error_from_errno("got_object_id_dup");
5256 
5257 	err = got_object_open_as_commit(&commit, repo, commit_id);
5258 	if (err)
5259 		goto done;
5260 
5261 	/*
5262 	 * The root is opened here and will be closed when the view is closed.
5263 	 * Any visited subtrees and their path-wise parents are opened and
5264 	 * closed on demand.
5265 	 */
5266 	err = got_object_open_as_tree(&s->root, repo,
5267 	    got_object_commit_get_tree_id(commit));
5268 	if (err)
5269 		goto done;
5270 	s->tree = s->root;
5271 
5272 	err = got_object_id_str(&commit_id_str, commit_id);
5273 	if (err != NULL)
5274 		goto done;
5275 
5276 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
5277 		err = got_error_from_errno("asprintf");
5278 		goto done;
5279 	}
5280 
5281 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
5282 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
5283 	if (head_ref_name) {
5284 		s->head_ref_name = strdup(head_ref_name);
5285 		if (s->head_ref_name == NULL) {
5286 			err = got_error_from_errno("strdup");
5287 			goto done;
5288 		}
5289 	}
5290 	s->repo = repo;
5291 
5292 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5293 		err = add_color(&s->colors, "\\$$",
5294 		    TOG_COLOR_TREE_SUBMODULE,
5295 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
5296 		if (err)
5297 			goto done;
5298 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
5299 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
5300 		if (err)
5301 			goto done;
5302 		err = add_color(&s->colors, "/$",
5303 		    TOG_COLOR_TREE_DIRECTORY,
5304 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
5305 		if (err)
5306 			goto done;
5307 
5308 		err = add_color(&s->colors, "\\*$",
5309 		    TOG_COLOR_TREE_EXECUTABLE,
5310 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
5311 		if (err)
5312 			goto done;
5313 
5314 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
5315 		    get_color_value("TOG_COLOR_COMMIT"));
5316 		if (err)
5317 			goto done;
5318 	}
5319 
5320 	view->show = show_tree_view;
5321 	view->input = input_tree_view;
5322 	view->close = close_tree_view;
5323 	view->search_start = search_start_tree_view;
5324 	view->search_next = search_next_tree_view;
5325 done:
5326 	free(commit_id_str);
5327 	if (commit)
5328 		got_object_commit_close(commit);
5329 	if (err)
5330 		close_tree_view(view);
5331 	return err;
5332 }
5333 
5334 static const struct got_error *
5335 close_tree_view(struct tog_view *view)
5336 {
5337 	struct tog_tree_view_state *s = &view->state.tree;
5338 
5339 	free_colors(&s->colors);
5340 	free(s->tree_label);
5341 	s->tree_label = NULL;
5342 	free(s->commit_id);
5343 	s->commit_id = NULL;
5344 	free(s->head_ref_name);
5345 	s->head_ref_name = NULL;
5346 	while (!TAILQ_EMPTY(&s->parents)) {
5347 		struct tog_parent_tree *parent;
5348 		parent = TAILQ_FIRST(&s->parents);
5349 		TAILQ_REMOVE(&s->parents, parent, entry);
5350 		if (parent->tree != s->root)
5351 			got_object_tree_close(parent->tree);
5352 		free(parent);
5353 
5354 	}
5355 	if (s->tree != NULL && s->tree != s->root)
5356 		got_object_tree_close(s->tree);
5357 	if (s->root)
5358 		got_object_tree_close(s->root);
5359 	return NULL;
5360 }
5361 
5362 static const struct got_error *
5363 search_start_tree_view(struct tog_view *view)
5364 {
5365 	struct tog_tree_view_state *s = &view->state.tree;
5366 
5367 	s->matched_entry = NULL;
5368 	return NULL;
5369 }
5370 
5371 static int
5372 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
5373 {
5374 	regmatch_t regmatch;
5375 
5376 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
5377 	    0) == 0;
5378 }
5379 
5380 static const struct got_error *
5381 search_next_tree_view(struct tog_view *view)
5382 {
5383 	struct tog_tree_view_state *s = &view->state.tree;
5384 	struct got_tree_entry *te = NULL;
5385 
5386 	if (!view->searching) {
5387 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5388 		return NULL;
5389 	}
5390 
5391 	if (s->matched_entry) {
5392 		if (view->searching == TOG_SEARCH_FORWARD) {
5393 			if (s->selected_entry)
5394 				te = got_tree_entry_get_next(s->tree,
5395 				    s->selected_entry);
5396 			else
5397 				te = got_object_tree_get_first_entry(s->tree);
5398 		} else {
5399 			if (s->selected_entry == NULL)
5400 				te = got_object_tree_get_last_entry(s->tree);
5401 			else
5402 				te = got_tree_entry_get_prev(s->tree,
5403 				    s->selected_entry);
5404 		}
5405 	} else {
5406 		if (s->selected_entry)
5407 			te = s->selected_entry;
5408 		else if (view->searching == TOG_SEARCH_FORWARD)
5409 			te = got_object_tree_get_first_entry(s->tree);
5410 		else
5411 			te = got_object_tree_get_last_entry(s->tree);
5412 	}
5413 
5414 	while (1) {
5415 		if (te == NULL) {
5416 			if (s->matched_entry == NULL) {
5417 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5418 				return NULL;
5419 			}
5420 			if (view->searching == TOG_SEARCH_FORWARD)
5421 				te = got_object_tree_get_first_entry(s->tree);
5422 			else
5423 				te = got_object_tree_get_last_entry(s->tree);
5424 		}
5425 
5426 		if (match_tree_entry(te, &view->regex)) {
5427 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
5428 			s->matched_entry = te;
5429 			break;
5430 		}
5431 
5432 		if (view->searching == TOG_SEARCH_FORWARD)
5433 			te = got_tree_entry_get_next(s->tree, te);
5434 		else
5435 			te = got_tree_entry_get_prev(s->tree, te);
5436 	}
5437 
5438 	if (s->matched_entry) {
5439 		s->first_displayed_entry = s->matched_entry;
5440 		s->selected = 0;
5441 	}
5442 
5443 	return NULL;
5444 }
5445 
5446 static const struct got_error *
5447 show_tree_view(struct tog_view *view)
5448 {
5449 	const struct got_error *err = NULL;
5450 	struct tog_tree_view_state *s = &view->state.tree;
5451 	char *parent_path;
5452 
5453 	err = tree_entry_path(&parent_path, &s->parents, NULL);
5454 	if (err)
5455 		return err;
5456 
5457 	err = draw_tree_entries(view, parent_path);
5458 	free(parent_path);
5459 
5460 	view_vborder(view);
5461 	return err;
5462 }
5463 
5464 static const struct got_error *
5465 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
5466 {
5467 	const struct got_error *err = NULL;
5468 	struct tog_tree_view_state *s = &view->state.tree;
5469 	struct tog_view *log_view, *ref_view;
5470 	struct got_tree_entry *te;
5471 	int begin_x = 0, n;
5472 
5473 	switch (ch) {
5474 	case 'i':
5475 		s->show_ids = !s->show_ids;
5476 		break;
5477 	case 'l':
5478 		if (!s->selected_entry)
5479 			break;
5480 		if (view_is_parent_view(view))
5481 			begin_x = view_split_begin_x(view->begin_x);
5482 		err = log_selected_tree_entry(&log_view, begin_x, s);
5483 		view->focussed = 0;
5484 		log_view->focussed = 1;
5485 		if (view_is_parent_view(view)) {
5486 			err = view_close_child(view);
5487 			if (err)
5488 				return err;
5489 			view_set_child(view, log_view);
5490 			view->focus_child = 1;
5491 		} else
5492 			*new_view = log_view;
5493 		break;
5494 	case 'r':
5495 		if (view_is_parent_view(view))
5496 			begin_x = view_split_begin_x(view->begin_x);
5497 		ref_view = view_open(view->nlines, view->ncols,
5498 		    view->begin_y, begin_x, TOG_VIEW_REF);
5499 		if (ref_view == NULL)
5500 			return got_error_from_errno("view_open");
5501 		err = open_ref_view(ref_view, s->repo);
5502 		if (err) {
5503 			view_close(ref_view);
5504 			return err;
5505 		}
5506 		view->focussed = 0;
5507 		ref_view->focussed = 1;
5508 		if (view_is_parent_view(view)) {
5509 			err = view_close_child(view);
5510 			if (err)
5511 				return err;
5512 			view_set_child(view, ref_view);
5513 			view->focus_child = 1;
5514 		} else
5515 			*new_view = ref_view;
5516 		break;
5517 	case 'g':
5518 	case KEY_HOME:
5519 		s->selected = 0;
5520 		if (s->tree == s->root)
5521 			s->first_displayed_entry =
5522 			    got_object_tree_get_first_entry(s->tree);
5523 		else
5524 			s->first_displayed_entry = NULL;
5525 		break;
5526 	case 'G':
5527 	case KEY_END:
5528 		s->selected = 0;
5529 		te = got_object_tree_get_last_entry(s->tree);
5530 		for (n = 0; n < view->nlines - 3; n++) {
5531 			if (te == NULL) {
5532 				if(s->tree != s->root) {
5533 					s->first_displayed_entry = NULL;
5534 					n++;
5535 				}
5536 				break;
5537 			}
5538 			s->first_displayed_entry = te;
5539 			te = got_tree_entry_get_prev(s->tree, te);
5540 		}
5541 		if (n > 0)
5542 			s->selected = n - 1;
5543 		break;
5544 	case 'k':
5545 	case KEY_UP:
5546 	case CTRL('p'):
5547 		if (s->selected > 0) {
5548 			s->selected--;
5549 			break;
5550 		}
5551 		tree_scroll_up(s, 1);
5552 		break;
5553 	case KEY_PPAGE:
5554 	case CTRL('b'):
5555 		if (s->tree == s->root) {
5556 			if (got_object_tree_get_first_entry(s->tree) ==
5557 			    s->first_displayed_entry)
5558 				s->selected = 0;
5559 		} else {
5560 			if (s->first_displayed_entry == NULL)
5561 				s->selected = 0;
5562 		}
5563 		tree_scroll_up(s, MAX(0, view->nlines - 3));
5564 		break;
5565 	case 'j':
5566 	case KEY_DOWN:
5567 	case CTRL('n'):
5568 		if (s->selected < s->ndisplayed - 1) {
5569 			s->selected++;
5570 			break;
5571 		}
5572 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
5573 		    == NULL)
5574 			/* can't scroll any further */
5575 			break;
5576 		tree_scroll_down(s, 1);
5577 		break;
5578 	case KEY_NPAGE:
5579 	case CTRL('f'):
5580 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
5581 		    == NULL) {
5582 			/* can't scroll any further; move cursor down */
5583 			if (s->selected < s->ndisplayed - 1)
5584 				s->selected = s->ndisplayed - 1;
5585 			break;
5586 		}
5587 		tree_scroll_down(s, view->nlines - 3);
5588 		break;
5589 	case KEY_ENTER:
5590 	case '\r':
5591 	case KEY_BACKSPACE:
5592 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
5593 			struct tog_parent_tree *parent;
5594 			/* user selected '..' */
5595 			if (s->tree == s->root)
5596 				break;
5597 			parent = TAILQ_FIRST(&s->parents);
5598 			TAILQ_REMOVE(&s->parents, parent,
5599 			    entry);
5600 			got_object_tree_close(s->tree);
5601 			s->tree = parent->tree;
5602 			s->first_displayed_entry =
5603 			    parent->first_displayed_entry;
5604 			s->selected_entry =
5605 			    parent->selected_entry;
5606 			s->selected = parent->selected;
5607 			free(parent);
5608 		} else if (S_ISDIR(got_tree_entry_get_mode(
5609 		    s->selected_entry))) {
5610 			struct got_tree_object *subtree;
5611 			err = got_object_open_as_tree(&subtree, s->repo,
5612 			    got_tree_entry_get_id(s->selected_entry));
5613 			if (err)
5614 				break;
5615 			err = tree_view_visit_subtree(s, subtree);
5616 			if (err) {
5617 				got_object_tree_close(subtree);
5618 				break;
5619 			}
5620 		} else if (S_ISREG(got_tree_entry_get_mode(
5621 		    s->selected_entry))) {
5622 			struct tog_view *blame_view;
5623 			int begin_x = view_is_parent_view(view) ?
5624 			    view_split_begin_x(view->begin_x) : 0;
5625 
5626 			err = blame_tree_entry(&blame_view, begin_x,
5627 			    s->selected_entry, &s->parents,
5628 			    s->commit_id, s->repo);
5629 			if (err)
5630 				break;
5631 			view->focussed = 0;
5632 			blame_view->focussed = 1;
5633 			if (view_is_parent_view(view)) {
5634 				err = view_close_child(view);
5635 				if (err)
5636 					return err;
5637 				view_set_child(view, blame_view);
5638 				view->focus_child = 1;
5639 			} else
5640 				*new_view = blame_view;
5641 		}
5642 		break;
5643 	case KEY_RESIZE:
5644 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
5645 			s->selected = view->nlines - 4;
5646 		break;
5647 	default:
5648 		break;
5649 	}
5650 
5651 	return err;
5652 }
5653 
5654 __dead static void
5655 usage_tree(void)
5656 {
5657 	endwin();
5658 	fprintf(stderr, "usage: %s tree [-c commit] [-r repository-path] [path]\n",
5659 	    getprogname());
5660 	exit(1);
5661 }
5662 
5663 static const struct got_error *
5664 cmd_tree(int argc, char *argv[])
5665 {
5666 	const struct got_error *error;
5667 	struct got_repository *repo = NULL;
5668 	struct got_worktree *worktree = NULL;
5669 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
5670 	struct got_object_id *commit_id = NULL;
5671 	const char *commit_id_arg = NULL;
5672 	char *label = NULL;
5673 	struct got_reference *ref = NULL;
5674 	const char *head_ref_name = NULL;
5675 	int ch;
5676 	struct tog_view *view;
5677 
5678 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
5679 		switch (ch) {
5680 		case 'c':
5681 			commit_id_arg = optarg;
5682 			break;
5683 		case 'r':
5684 			repo_path = realpath(optarg, NULL);
5685 			if (repo_path == NULL)
5686 				return got_error_from_errno2("realpath",
5687 				    optarg);
5688 			break;
5689 		default:
5690 			usage_tree();
5691 			/* NOTREACHED */
5692 		}
5693 	}
5694 
5695 	argc -= optind;
5696 	argv += optind;
5697 
5698 	if (argc > 1)
5699 		usage_tree();
5700 
5701 	if (repo_path == NULL) {
5702 		cwd = getcwd(NULL, 0);
5703 		if (cwd == NULL)
5704 			return got_error_from_errno("getcwd");
5705 		error = got_worktree_open(&worktree, cwd);
5706 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5707 			goto done;
5708 		if (worktree)
5709 			repo_path =
5710 			    strdup(got_worktree_get_repo_path(worktree));
5711 		else
5712 			repo_path = strdup(cwd);
5713 		if (repo_path == NULL) {
5714 			error = got_error_from_errno("strdup");
5715 			goto done;
5716 		}
5717 	}
5718 
5719 	error = got_repo_open(&repo, repo_path, NULL);
5720 	if (error != NULL)
5721 		goto done;
5722 
5723 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
5724 	    repo, worktree);
5725 	if (error)
5726 		goto done;
5727 
5728 	init_curses();
5729 
5730 	error = apply_unveil(got_repo_get_path(repo), NULL);
5731 	if (error)
5732 		goto done;
5733 
5734 	error = tog_load_refs(repo, 0);
5735 	if (error)
5736 		goto done;
5737 
5738 	if (commit_id_arg == NULL) {
5739 		error = got_repo_match_object_id(&commit_id, &label,
5740 		    worktree ? got_worktree_get_head_ref_name(worktree) :
5741 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5742 		if (error)
5743 			goto done;
5744 		head_ref_name = label;
5745 	} else {
5746 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
5747 		if (error == NULL)
5748 			head_ref_name = got_ref_get_name(ref);
5749 		else if (error->code != GOT_ERR_NOT_REF)
5750 			goto done;
5751 		error = got_repo_match_object_id(&commit_id, NULL,
5752 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5753 		if (error)
5754 			goto done;
5755 	}
5756 
5757 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
5758 	if (view == NULL) {
5759 		error = got_error_from_errno("view_open");
5760 		goto done;
5761 	}
5762 	error = open_tree_view(view, commit_id, head_ref_name, repo);
5763 	if (error)
5764 		goto done;
5765 	if (!got_path_is_root_dir(in_repo_path)) {
5766 		error = tree_view_walk_path(&view->state.tree, commit_id,
5767 		    in_repo_path);
5768 		if (error)
5769 			goto done;
5770 	}
5771 
5772 	if (worktree) {
5773 		/* Release work tree lock. */
5774 		got_worktree_close(worktree);
5775 		worktree = NULL;
5776 	}
5777 	error = view_loop(view);
5778 done:
5779 	free(repo_path);
5780 	free(cwd);
5781 	free(commit_id);
5782 	free(label);
5783 	if (ref)
5784 		got_ref_close(ref);
5785 	if (repo) {
5786 		const struct got_error *close_err = got_repo_close(repo);
5787 		if (error == NULL)
5788 			error = close_err;
5789 	}
5790 	tog_free_refs();
5791 	return error;
5792 }
5793 
5794 static const struct got_error *
5795 ref_view_load_refs(struct tog_ref_view_state *s)
5796 {
5797 	struct got_reflist_entry *sre;
5798 	struct tog_reflist_entry *re;
5799 
5800 	s->nrefs = 0;
5801 	TAILQ_FOREACH(sre, &tog_refs, entry) {
5802 		if (strncmp(got_ref_get_name(sre->ref),
5803 		    "refs/got/", 9) == 0 &&
5804 		    strncmp(got_ref_get_name(sre->ref),
5805 		    "refs/got/backup/", 16) != 0)
5806 			continue;
5807 
5808 		re = malloc(sizeof(*re));
5809 		if (re == NULL)
5810 			return got_error_from_errno("malloc");
5811 
5812 		re->ref = got_ref_dup(sre->ref);
5813 		if (re->ref == NULL)
5814 			return got_error_from_errno("got_ref_dup");
5815 		re->idx = s->nrefs++;
5816 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
5817 	}
5818 
5819 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
5820 	return NULL;
5821 }
5822 
5823 void
5824 ref_view_free_refs(struct tog_ref_view_state *s)
5825 {
5826 	struct tog_reflist_entry *re;
5827 
5828 	while (!TAILQ_EMPTY(&s->refs)) {
5829 		re = TAILQ_FIRST(&s->refs);
5830 		TAILQ_REMOVE(&s->refs, re, entry);
5831 		got_ref_close(re->ref);
5832 		free(re);
5833 	}
5834 }
5835 
5836 static const struct got_error *
5837 open_ref_view(struct tog_view *view, struct got_repository *repo)
5838 {
5839 	const struct got_error *err = NULL;
5840 	struct tog_ref_view_state *s = &view->state.ref;
5841 
5842 	s->selected_entry = 0;
5843 	s->repo = repo;
5844 
5845 	TAILQ_INIT(&s->refs);
5846 	STAILQ_INIT(&s->colors);
5847 
5848 	err = ref_view_load_refs(s);
5849 	if (err)
5850 		return err;
5851 
5852 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5853 		err = add_color(&s->colors, "^refs/heads/",
5854 		    TOG_COLOR_REFS_HEADS,
5855 		    get_color_value("TOG_COLOR_REFS_HEADS"));
5856 		if (err)
5857 			goto done;
5858 
5859 		err = add_color(&s->colors, "^refs/tags/",
5860 		    TOG_COLOR_REFS_TAGS,
5861 		    get_color_value("TOG_COLOR_REFS_TAGS"));
5862 		if (err)
5863 			goto done;
5864 
5865 		err = add_color(&s->colors, "^refs/remotes/",
5866 		    TOG_COLOR_REFS_REMOTES,
5867 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
5868 		if (err)
5869 			goto done;
5870 
5871 		err = add_color(&s->colors, "^refs/got/backup/",
5872 		    TOG_COLOR_REFS_BACKUP,
5873 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
5874 		if (err)
5875 			goto done;
5876 	}
5877 
5878 	view->show = show_ref_view;
5879 	view->input = input_ref_view;
5880 	view->close = close_ref_view;
5881 	view->search_start = search_start_ref_view;
5882 	view->search_next = search_next_ref_view;
5883 done:
5884 	if (err)
5885 		free_colors(&s->colors);
5886 	return err;
5887 }
5888 
5889 static const struct got_error *
5890 close_ref_view(struct tog_view *view)
5891 {
5892 	struct tog_ref_view_state *s = &view->state.ref;
5893 
5894 	ref_view_free_refs(s);
5895 	free_colors(&s->colors);
5896 
5897 	return NULL;
5898 }
5899 
5900 static const struct got_error *
5901 resolve_reflist_entry(struct got_object_id **commit_id,
5902     struct tog_reflist_entry *re, struct got_repository *repo)
5903 {
5904 	const struct got_error *err = NULL;
5905 	struct got_object_id *obj_id;
5906 	struct got_tag_object *tag = NULL;
5907 	int obj_type;
5908 
5909 	*commit_id = NULL;
5910 
5911 	err = got_ref_resolve(&obj_id, repo, re->ref);
5912 	if (err)
5913 		return err;
5914 
5915 	err = got_object_get_type(&obj_type, repo, obj_id);
5916 	if (err)
5917 		goto done;
5918 
5919 	switch (obj_type) {
5920 	case GOT_OBJ_TYPE_COMMIT:
5921 		*commit_id = obj_id;
5922 		break;
5923 	case GOT_OBJ_TYPE_TAG:
5924 		err = got_object_open_as_tag(&tag, repo, obj_id);
5925 		if (err)
5926 			goto done;
5927 		free(obj_id);
5928 		err = got_object_get_type(&obj_type, repo,
5929 		    got_object_tag_get_object_id(tag));
5930 		if (err)
5931 			goto done;
5932 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
5933 			err = got_error(GOT_ERR_OBJ_TYPE);
5934 			goto done;
5935 		}
5936 		*commit_id = got_object_id_dup(
5937 		    got_object_tag_get_object_id(tag));
5938 		if (*commit_id == NULL) {
5939 			err = got_error_from_errno("got_object_id_dup");
5940 			goto done;
5941 		}
5942 		break;
5943 	default:
5944 		err = got_error(GOT_ERR_OBJ_TYPE);
5945 		break;
5946 	}
5947 
5948 done:
5949 	if (tag)
5950 		got_object_tag_close(tag);
5951 	if (err) {
5952 		free(*commit_id);
5953 		*commit_id = NULL;
5954 	}
5955 	return err;
5956 }
5957 
5958 static const struct got_error *
5959 log_ref_entry(struct tog_view **new_view, int begin_x,
5960     struct tog_reflist_entry *re, struct got_repository *repo)
5961 {
5962 	struct tog_view *log_view;
5963 	const struct got_error *err = NULL;
5964 	struct got_object_id *commit_id = NULL;
5965 
5966 	*new_view = NULL;
5967 
5968 	err = resolve_reflist_entry(&commit_id, re, repo);
5969 	if (err) {
5970 		if (err->code != GOT_ERR_OBJ_TYPE)
5971 			return err;
5972 		else
5973 			return NULL;
5974 	}
5975 
5976 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
5977 	if (log_view == NULL) {
5978 		err = got_error_from_errno("view_open");
5979 		goto done;
5980 	}
5981 
5982 	err = open_log_view(log_view, commit_id, repo,
5983 	    got_ref_get_name(re->ref), "", 0);
5984 done:
5985 	if (err)
5986 		view_close(log_view);
5987 	else
5988 		*new_view = log_view;
5989 	free(commit_id);
5990 	return err;
5991 }
5992 
5993 static void
5994 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
5995 {
5996 	struct tog_reflist_entry *re;
5997 	int i = 0;
5998 
5999 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
6000 		return;
6001 
6002 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
6003 	while (i++ < maxscroll) {
6004 		if (re == NULL)
6005 			break;
6006 		s->first_displayed_entry = re;
6007 		re = TAILQ_PREV(re, tog_reflist_head, entry);
6008 	}
6009 }
6010 
6011 static void
6012 ref_scroll_down(struct tog_ref_view_state *s, int maxscroll)
6013 {
6014 	struct tog_reflist_entry *next, *last;
6015 	int n = 0;
6016 
6017 	if (s->first_displayed_entry)
6018 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
6019 	else
6020 		next = TAILQ_FIRST(&s->refs);
6021 
6022 	last = s->last_displayed_entry;
6023 	while (next && last && n++ < maxscroll) {
6024 		last = TAILQ_NEXT(last, entry);
6025 		if (last) {
6026 			s->first_displayed_entry = next;
6027 			next = TAILQ_NEXT(next, entry);
6028 		}
6029 	}
6030 }
6031 
6032 static const struct got_error *
6033 search_start_ref_view(struct tog_view *view)
6034 {
6035 	struct tog_ref_view_state *s = &view->state.ref;
6036 
6037 	s->matched_entry = NULL;
6038 	return NULL;
6039 }
6040 
6041 static int
6042 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
6043 {
6044 	regmatch_t regmatch;
6045 
6046 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
6047 	    0) == 0;
6048 }
6049 
6050 static const struct got_error *
6051 search_next_ref_view(struct tog_view *view)
6052 {
6053 	struct tog_ref_view_state *s = &view->state.ref;
6054 	struct tog_reflist_entry *re = NULL;
6055 
6056 	if (!view->searching) {
6057 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6058 		return NULL;
6059 	}
6060 
6061 	if (s->matched_entry) {
6062 		if (view->searching == TOG_SEARCH_FORWARD) {
6063 			if (s->selected_entry)
6064 				re = TAILQ_NEXT(s->selected_entry, entry);
6065 			else
6066 				re = TAILQ_PREV(s->selected_entry,
6067 				    tog_reflist_head, entry);
6068 		} else {
6069 			if (s->selected_entry == NULL)
6070 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
6071 			else
6072 				re = TAILQ_PREV(s->selected_entry,
6073 				    tog_reflist_head, entry);
6074 		}
6075 	} else {
6076 		if (s->selected_entry)
6077 			re = s->selected_entry;
6078 		else if (view->searching == TOG_SEARCH_FORWARD)
6079 			re = TAILQ_FIRST(&s->refs);
6080 		else
6081 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
6082 	}
6083 
6084 	while (1) {
6085 		if (re == NULL) {
6086 			if (s->matched_entry == NULL) {
6087 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6088 				return NULL;
6089 			}
6090 			if (view->searching == TOG_SEARCH_FORWARD)
6091 				re = TAILQ_FIRST(&s->refs);
6092 			else
6093 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
6094 		}
6095 
6096 		if (match_reflist_entry(re, &view->regex)) {
6097 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6098 			s->matched_entry = re;
6099 			break;
6100 		}
6101 
6102 		if (view->searching == TOG_SEARCH_FORWARD)
6103 			re = TAILQ_NEXT(re, entry);
6104 		else
6105 			re = TAILQ_PREV(re, tog_reflist_head, entry);
6106 	}
6107 
6108 	if (s->matched_entry) {
6109 		s->first_displayed_entry = s->matched_entry;
6110 		s->selected = 0;
6111 	}
6112 
6113 	return NULL;
6114 }
6115 
6116 static const struct got_error *
6117 show_ref_view(struct tog_view *view)
6118 {
6119 	const struct got_error *err = NULL;
6120 	struct tog_ref_view_state *s = &view->state.ref;
6121 	struct tog_reflist_entry *re;
6122 	char *line = NULL;
6123 	wchar_t *wline;
6124 	struct tog_color *tc;
6125 	int width, n;
6126 	int limit = view->nlines;
6127 
6128 	werase(view->window);
6129 
6130 	s->ndisplayed = 0;
6131 
6132 	if (limit == 0)
6133 		return NULL;
6134 
6135 	re = s->first_displayed_entry;
6136 
6137 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
6138 	    s->nrefs) == -1)
6139 		return got_error_from_errno("asprintf");
6140 
6141 	err = format_line(&wline, &width, line, view->ncols, 0);
6142 	if (err) {
6143 		free(line);
6144 		return err;
6145 	}
6146 	if (view_needs_focus_indication(view))
6147 		wstandout(view->window);
6148 	waddwstr(view->window, wline);
6149 	if (view_needs_focus_indication(view))
6150 		wstandend(view->window);
6151 	free(wline);
6152 	wline = NULL;
6153 	free(line);
6154 	line = NULL;
6155 	if (width < view->ncols - 1)
6156 		waddch(view->window, '\n');
6157 	if (--limit <= 0)
6158 		return NULL;
6159 
6160 	n = 0;
6161 	while (re && limit > 0) {
6162 		char *line = NULL;
6163 
6164 		if (got_ref_is_symbolic(re->ref)) {
6165 			if (asprintf(&line, "%s -> %s",
6166 			    got_ref_get_name(re->ref),
6167 			    got_ref_get_symref_target(re->ref)) == -1)
6168 				return got_error_from_errno("asprintf");
6169 		} else if (s->show_ids) {
6170 			struct got_object_id *id;
6171 			char *id_str;
6172 			err = got_ref_resolve(&id, s->repo, re->ref);
6173 			if (err)
6174 				return err;
6175 			err = got_object_id_str(&id_str, id);
6176 			if (err) {
6177 				free(id);
6178 				return err;
6179 			}
6180 			if (asprintf(&line, "%s: %s",
6181 			    got_ref_get_name(re->ref), id_str) == -1) {
6182 				err = got_error_from_errno("asprintf");
6183 				free(id);
6184 				free(id_str);
6185 				return err;
6186 			}
6187 			free(id);
6188 			free(id_str);
6189 		} else {
6190 			line = strdup(got_ref_get_name(re->ref));
6191 			if (line == NULL)
6192 				return got_error_from_errno("strdup");
6193 		}
6194 
6195 		err = format_line(&wline, &width, line, view->ncols, 0);
6196 		if (err) {
6197 			free(line);
6198 			return err;
6199 		}
6200 		if (n == s->selected) {
6201 			if (view->focussed)
6202 				wstandout(view->window);
6203 			s->selected_entry = re;
6204 		}
6205 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
6206 		if (tc)
6207 			wattr_on(view->window,
6208 			    COLOR_PAIR(tc->colorpair), NULL);
6209 		waddwstr(view->window, wline);
6210 		if (tc)
6211 			wattr_off(view->window,
6212 			    COLOR_PAIR(tc->colorpair), NULL);
6213 		if (width < view->ncols - 1)
6214 			waddch(view->window, '\n');
6215 		if (n == s->selected && view->focussed)
6216 			wstandend(view->window);
6217 		free(line);
6218 		free(wline);
6219 		wline = NULL;
6220 		n++;
6221 		s->ndisplayed++;
6222 		s->last_displayed_entry = re;
6223 
6224 		limit--;
6225 		re = TAILQ_NEXT(re, entry);
6226 	}
6227 
6228 	view_vborder(view);
6229 	return err;
6230 }
6231 
6232 static const struct got_error *
6233 browse_ref_tree(struct tog_view **new_view, int begin_x,
6234     struct tog_reflist_entry *re, struct got_repository *repo)
6235 {
6236 	const struct got_error *err = NULL;
6237 	struct got_object_id *commit_id = NULL;
6238 	struct tog_view *tree_view;
6239 
6240 	*new_view = NULL;
6241 
6242 	err = resolve_reflist_entry(&commit_id, re, repo);
6243 	if (err) {
6244 		if (err->code != GOT_ERR_OBJ_TYPE)
6245 			return err;
6246 		else
6247 			return NULL;
6248 	}
6249 
6250 
6251 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
6252 	if (tree_view == NULL) {
6253 		err = got_error_from_errno("view_open");
6254 		goto done;
6255 	}
6256 
6257 	err = open_tree_view(tree_view, commit_id,
6258 	    got_ref_get_name(re->ref), repo);
6259 	if (err)
6260 		goto done;
6261 
6262 	*new_view = tree_view;
6263 done:
6264 	free(commit_id);
6265 	return err;
6266 }
6267 static const struct got_error *
6268 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
6269 {
6270 	const struct got_error *err = NULL;
6271 	struct tog_ref_view_state *s = &view->state.ref;
6272 	struct tog_view *log_view, *tree_view;
6273 	struct tog_reflist_entry *re;
6274 	int begin_x = 0, n;
6275 
6276 	switch (ch) {
6277 	case 'i':
6278 		s->show_ids = !s->show_ids;
6279 		break;
6280 	case 'o':
6281 		s->sort_by_date = !s->sort_by_date;
6282 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
6283 		    got_ref_cmp_by_commit_timestamp_descending :
6284 		    tog_ref_cmp_by_name, s->repo);
6285 		if (err)
6286 			break;
6287 		got_reflist_object_id_map_free(tog_refs_idmap);
6288 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
6289 		    &tog_refs, s->repo);
6290 		if (err)
6291 			break;
6292 		ref_view_free_refs(s);
6293 		err = ref_view_load_refs(s);
6294 		break;
6295 	case KEY_ENTER:
6296 	case '\r':
6297 		if (!s->selected_entry)
6298 			break;
6299 		if (view_is_parent_view(view))
6300 			begin_x = view_split_begin_x(view->begin_x);
6301 		err = log_ref_entry(&log_view, begin_x, s->selected_entry,
6302 		    s->repo);
6303 		view->focussed = 0;
6304 		log_view->focussed = 1;
6305 		if (view_is_parent_view(view)) {
6306 			err = view_close_child(view);
6307 			if (err)
6308 				return err;
6309 			view_set_child(view, log_view);
6310 			view->focus_child = 1;
6311 		} else
6312 			*new_view = log_view;
6313 		break;
6314 	case 't':
6315 		if (!s->selected_entry)
6316 			break;
6317 		if (view_is_parent_view(view))
6318 			begin_x = view_split_begin_x(view->begin_x);
6319 		err = browse_ref_tree(&tree_view, begin_x, s->selected_entry,
6320 		    s->repo);
6321 		if (err || tree_view == NULL)
6322 			break;
6323 		view->focussed = 0;
6324 		tree_view->focussed = 1;
6325 		if (view_is_parent_view(view)) {
6326 			err = view_close_child(view);
6327 			if (err)
6328 				return err;
6329 			view_set_child(view, tree_view);
6330 			view->focus_child = 1;
6331 		} else
6332 			*new_view = tree_view;
6333 		break;
6334 	case 'g':
6335 	case KEY_HOME:
6336 		s->selected = 0;
6337 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
6338 		break;
6339 	case 'G':
6340 	case KEY_END:
6341 		s->selected = 0;
6342 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
6343 		for (n = 0; n < view->nlines - 1; n++) {
6344 			if (re == NULL)
6345 				break;
6346 			s->first_displayed_entry = re;
6347 			re = TAILQ_PREV(re, tog_reflist_head, entry);
6348 		}
6349 		if (n > 0)
6350 			s->selected = n - 1;
6351 		break;
6352 	case 'k':
6353 	case KEY_UP:
6354 	case CTRL('p'):
6355 		if (s->selected > 0) {
6356 			s->selected--;
6357 			break;
6358 		}
6359 		ref_scroll_up(s, 1);
6360 		break;
6361 	case KEY_PPAGE:
6362 	case CTRL('b'):
6363 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
6364 			s->selected = 0;
6365 		ref_scroll_up(s, MAX(0, view->nlines - 1));
6366 		break;
6367 	case 'j':
6368 	case KEY_DOWN:
6369 	case CTRL('n'):
6370 		if (s->selected < s->ndisplayed - 1) {
6371 			s->selected++;
6372 			break;
6373 		}
6374 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL)
6375 			/* can't scroll any further */
6376 			break;
6377 		ref_scroll_down(s, 1);
6378 		break;
6379 	case KEY_NPAGE:
6380 	case CTRL('f'):
6381 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
6382 			/* can't scroll any further; move cursor down */
6383 			if (s->selected < s->ndisplayed - 1)
6384 				s->selected = s->ndisplayed - 1;
6385 			break;
6386 		}
6387 		ref_scroll_down(s, view->nlines - 1);
6388 		break;
6389 	case CTRL('l'):
6390 		tog_free_refs();
6391 		err = tog_load_refs(s->repo, s->sort_by_date);
6392 		if (err)
6393 			break;
6394 		ref_view_free_refs(s);
6395 		err = ref_view_load_refs(s);
6396 		break;
6397 	case KEY_RESIZE:
6398 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
6399 			s->selected = view->nlines - 2;
6400 		break;
6401 	default:
6402 		break;
6403 	}
6404 
6405 	return err;
6406 }
6407 
6408 __dead static void
6409 usage_ref(void)
6410 {
6411 	endwin();
6412 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
6413 	    getprogname());
6414 	exit(1);
6415 }
6416 
6417 static const struct got_error *
6418 cmd_ref(int argc, char *argv[])
6419 {
6420 	const struct got_error *error;
6421 	struct got_repository *repo = NULL;
6422 	struct got_worktree *worktree = NULL;
6423 	char *cwd = NULL, *repo_path = NULL;
6424 	int ch;
6425 	struct tog_view *view;
6426 
6427 	while ((ch = getopt(argc, argv, "r:")) != -1) {
6428 		switch (ch) {
6429 		case 'r':
6430 			repo_path = realpath(optarg, NULL);
6431 			if (repo_path == NULL)
6432 				return got_error_from_errno2("realpath",
6433 				    optarg);
6434 			break;
6435 		default:
6436 			usage_ref();
6437 			/* NOTREACHED */
6438 		}
6439 	}
6440 
6441 	argc -= optind;
6442 	argv += optind;
6443 
6444 	if (argc > 1)
6445 		usage_ref();
6446 
6447 	if (repo_path == NULL) {
6448 		cwd = getcwd(NULL, 0);
6449 		if (cwd == NULL)
6450 			return got_error_from_errno("getcwd");
6451 		error = got_worktree_open(&worktree, cwd);
6452 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6453 			goto done;
6454 		if (worktree)
6455 			repo_path =
6456 			    strdup(got_worktree_get_repo_path(worktree));
6457 		else
6458 			repo_path = strdup(cwd);
6459 		if (repo_path == NULL) {
6460 			error = got_error_from_errno("strdup");
6461 			goto done;
6462 		}
6463 	}
6464 
6465 	error = got_repo_open(&repo, repo_path, NULL);
6466 	if (error != NULL)
6467 		goto done;
6468 
6469 	init_curses();
6470 
6471 	error = apply_unveil(got_repo_get_path(repo), NULL);
6472 	if (error)
6473 		goto done;
6474 
6475 	error = tog_load_refs(repo, 0);
6476 	if (error)
6477 		goto done;
6478 
6479 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
6480 	if (view == NULL) {
6481 		error = got_error_from_errno("view_open");
6482 		goto done;
6483 	}
6484 
6485 	error = open_ref_view(view, repo);
6486 	if (error)
6487 		goto done;
6488 
6489 	if (worktree) {
6490 		/* Release work tree lock. */
6491 		got_worktree_close(worktree);
6492 		worktree = NULL;
6493 	}
6494 	error = view_loop(view);
6495 done:
6496 	free(repo_path);
6497 	free(cwd);
6498 	if (repo) {
6499 		const struct got_error *close_err = got_repo_close(repo);
6500 		if (close_err)
6501 			error = close_err;
6502 	}
6503 	tog_free_refs();
6504 	return error;
6505 }
6506 
6507 static void
6508 list_commands(FILE *fp)
6509 {
6510 	size_t i;
6511 
6512 	fprintf(fp, "commands:");
6513 	for (i = 0; i < nitems(tog_commands); i++) {
6514 		struct tog_cmd *cmd = &tog_commands[i];
6515 		fprintf(fp, " %s", cmd->name);
6516 	}
6517 	fputc('\n', fp);
6518 }
6519 
6520 __dead static void
6521 usage(int hflag, int status)
6522 {
6523 	FILE *fp = (status == 0) ? stdout : stderr;
6524 
6525 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
6526 	    getprogname());
6527 	if (hflag) {
6528 		fprintf(fp, "lazy usage: %s path\n", getprogname());
6529 		list_commands(fp);
6530 	}
6531 	exit(status);
6532 }
6533 
6534 static char **
6535 make_argv(int argc, ...)
6536 {
6537 	va_list ap;
6538 	char **argv;
6539 	int i;
6540 
6541 	va_start(ap, argc);
6542 
6543 	argv = calloc(argc, sizeof(char *));
6544 	if (argv == NULL)
6545 		err(1, "calloc");
6546 	for (i = 0; i < argc; i++) {
6547 		argv[i] = strdup(va_arg(ap, char *));
6548 		if (argv[i] == NULL)
6549 			err(1, "strdup");
6550 	}
6551 
6552 	va_end(ap);
6553 	return argv;
6554 }
6555 
6556 /*
6557  * Try to convert 'tog path' into a 'tog log path' command.
6558  * The user could simply have mistyped the command rather than knowingly
6559  * provided a path. So check whether argv[0] can in fact be resolved
6560  * to a path in the HEAD commit and print a special error if not.
6561  * This hack is for mpi@ <3
6562  */
6563 static const struct got_error *
6564 tog_log_with_path(int argc, char *argv[])
6565 {
6566 	const struct got_error *error = NULL, *close_err;
6567 	struct tog_cmd *cmd = NULL;
6568 	struct got_repository *repo = NULL;
6569 	struct got_worktree *worktree = NULL;
6570 	struct got_object_id *commit_id = NULL, *id = NULL;
6571 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6572 	char *commit_id_str = NULL, **cmd_argv = NULL;
6573 
6574 	cwd = getcwd(NULL, 0);
6575 	if (cwd == NULL)
6576 		return got_error_from_errno("getcwd");
6577 
6578 	error = got_worktree_open(&worktree, cwd);
6579 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
6580 		goto done;
6581 
6582 	if (worktree)
6583 		repo_path = strdup(got_worktree_get_repo_path(worktree));
6584 	else
6585 		repo_path = strdup(cwd);
6586 	if (repo_path == NULL) {
6587 		error = got_error_from_errno("strdup");
6588 		goto done;
6589 	}
6590 
6591 	error = got_repo_open(&repo, repo_path, NULL);
6592 	if (error != NULL)
6593 		goto done;
6594 
6595 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
6596 	    repo, worktree);
6597 	if (error)
6598 		goto done;
6599 
6600 	error = tog_load_refs(repo, 0);
6601 	if (error)
6602 		goto done;
6603 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
6604 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
6605 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6606 	if (error)
6607 		goto done;
6608 
6609 	if (worktree) {
6610 		got_worktree_close(worktree);
6611 		worktree = NULL;
6612 	}
6613 
6614 	error = got_object_id_by_path(&id, repo, commit_id, in_repo_path);
6615 	if (error) {
6616 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
6617 			goto done;
6618 		fprintf(stderr, "%s: '%s' is no known command or path\n",
6619 		    getprogname(), argv[0]);
6620 		usage(1, 1);
6621 		/* not reached */
6622 	}
6623 
6624 	close_err = got_repo_close(repo);
6625 	if (error == NULL)
6626 		error = close_err;
6627 	repo = NULL;
6628 
6629 	error = got_object_id_str(&commit_id_str, commit_id);
6630 	if (error)
6631 		goto done;
6632 
6633 	cmd = &tog_commands[0]; /* log */
6634 	argc = 4;
6635 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
6636 	error = cmd->cmd_main(argc, cmd_argv);
6637 done:
6638 	if (repo) {
6639 		close_err = got_repo_close(repo);
6640 		if (error == NULL)
6641 			error = close_err;
6642 	}
6643 	if (worktree)
6644 		got_worktree_close(worktree);
6645 	free(id);
6646 	free(commit_id_str);
6647 	free(commit_id);
6648 	free(cwd);
6649 	free(repo_path);
6650 	free(in_repo_path);
6651 	if (cmd_argv) {
6652 		int i;
6653 		for (i = 0; i < argc; i++)
6654 			free(cmd_argv[i]);
6655 		free(cmd_argv);
6656 	}
6657 	tog_free_refs();
6658 	return error;
6659 }
6660 
6661 int
6662 main(int argc, char *argv[])
6663 {
6664 	const struct got_error *error = NULL;
6665 	struct tog_cmd *cmd = NULL;
6666 	int ch, hflag = 0, Vflag = 0;
6667 	char **cmd_argv = NULL;
6668 	static struct option longopts[] = {
6669 	    { "version", no_argument, NULL, 'V' },
6670 	    { NULL, 0, NULL, 0}
6671 	};
6672 
6673 	setlocale(LC_CTYPE, "");
6674 
6675 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
6676 		switch (ch) {
6677 		case 'h':
6678 			hflag = 1;
6679 			break;
6680 		case 'V':
6681 			Vflag = 1;
6682 			break;
6683 		default:
6684 			usage(hflag, 1);
6685 			/* NOTREACHED */
6686 		}
6687 	}
6688 
6689 	argc -= optind;
6690 	argv += optind;
6691 	optind = 1;
6692 	optreset = 1;
6693 
6694 	if (Vflag) {
6695 		got_version_print_str();
6696 		return 0;
6697 	}
6698 
6699 #ifndef PROFILE
6700 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
6701 	    NULL) == -1)
6702 		err(1, "pledge");
6703 #endif
6704 
6705 	if (argc == 0) {
6706 		if (hflag)
6707 			usage(hflag, 0);
6708 		/* Build an argument vector which runs a default command. */
6709 		cmd = &tog_commands[0];
6710 		argc = 1;
6711 		cmd_argv = make_argv(argc, cmd->name);
6712 	} else {
6713 		size_t i;
6714 
6715 		/* Did the user specify a command? */
6716 		for (i = 0; i < nitems(tog_commands); i++) {
6717 			if (strncmp(tog_commands[i].name, argv[0],
6718 			    strlen(argv[0])) == 0) {
6719 				cmd = &tog_commands[i];
6720 				break;
6721 			}
6722 		}
6723 	}
6724 
6725 	if (cmd == NULL) {
6726 		if (argc != 1)
6727 			usage(0, 1);
6728 		/* No command specified; try log with a path */
6729 		error = tog_log_with_path(argc, argv);
6730 	} else {
6731 		if (hflag)
6732 			cmd->cmd_usage();
6733 		else
6734 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
6735 	}
6736 
6737 	endwin();
6738 	putchar('\n');
6739 	if (cmd_argv) {
6740 		int i;
6741 		for (i = 0; i < argc; i++)
6742 			free(cmd_argv[i]);
6743 		free(cmd_argv);
6744 	}
6745 
6746 	if (error && error->code != GOT_ERR_CANCELLED)
6747 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
6748 	return 0;
6749 }