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