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 	int begin_x = 0;
2391 
2392 	if (s->thread_args.load_all) {
2393 		if (ch == KEY_BACKSPACE)
2394 			s->thread_args.load_all = 0;
2395 		else if (s->thread_args.log_complete) {
2396 			s->thread_args.load_all = 0;
2397 			log_scroll_down(view, s->commits.ncommits);
2398 			s->selected = MIN(view->nlines - 2,
2399 			    s->commits.ncommits - 1);
2400 			select_commit(s);
2401 		}
2402 		return NULL;
2403 	}
2404 
2405 	switch (ch) {
2406 	case 'q':
2407 		s->quit = 1;
2408 		break;
2409 	case 'k':
2410 	case KEY_UP:
2411 	case '<':
2412 	case ',':
2413 		if (s->first_displayed_entry == NULL)
2414 			break;
2415 		if (s->selected > 0)
2416 			s->selected--;
2417 		else
2418 			log_scroll_up(s, 1);
2419 		select_commit(s);
2420 		break;
2421 	case 'g':
2422 	case KEY_HOME:
2423 		if (s->first_displayed_entry == NULL)
2424 			break;
2425 
2426 		s->selected = 0;
2427 		log_scroll_up(s, s->commits.ncommits);
2428 		select_commit(s);
2429 		break;
2430 	case KEY_PPAGE:
2431 	case CTRL('b'):
2432 		if (s->first_displayed_entry == NULL)
2433 			break;
2434 		if (TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
2435 			s->selected = 0;
2436 		else
2437 			log_scroll_up(s, view->nlines - 1);
2438 		select_commit(s);
2439 		break;
2440 	case 'j':
2441 	case KEY_DOWN:
2442 	case '>':
2443 	case '.':
2444 		if (s->first_displayed_entry == NULL)
2445 			break;
2446 		if (s->selected < MIN(view->nlines - 2,
2447 		    s->commits.ncommits - 1))
2448 			s->selected++;
2449 		else {
2450 			err = log_scroll_down(view, 1);
2451 			if (err)
2452 				break;
2453 		}
2454 		select_commit(s);
2455 		break;
2456 	case 'G':
2457 	case KEY_END: {
2458 		/* We don't know yet how many commits, so we're forced to
2459 		 * traverse them all. */
2460 		if (!s->thread_args.log_complete) {
2461 			s->thread_args.load_all = 1;
2462 			return trigger_log_thread(view, 0);
2463 		}
2464 
2465 		log_scroll_down(view, s->commits.ncommits);
2466 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
2467 		select_commit(s);
2468 		break;
2469 	}
2470 	case KEY_NPAGE:
2471 	case CTRL('f'): {
2472 		struct commit_queue_entry *first;
2473 		first = s->first_displayed_entry;
2474 		if (first == NULL)
2475 			break;
2476 		err = log_scroll_down(view, view->nlines - 1);
2477 		if (err)
2478 			break;
2479 		if (first == s->first_displayed_entry &&
2480 		    s->selected < MIN(view->nlines - 2,
2481 		    s->commits.ncommits - 1)) {
2482 			/* can't scroll further down */
2483 			s->selected = MIN(view->nlines - 2,
2484 			    s->commits.ncommits - 1);
2485 		}
2486 		select_commit(s);
2487 		break;
2488 	}
2489 	case KEY_RESIZE:
2490 		if (s->selected > view->nlines - 2)
2491 			s->selected = view->nlines - 2;
2492 		if (s->selected > s->commits.ncommits - 1)
2493 			s->selected = s->commits.ncommits - 1;
2494 		select_commit(s);
2495 		if (s->commits.ncommits < view->nlines - 1 &&
2496 		    !s->thread_args.log_complete) {
2497 			s->thread_args.commits_needed += (view->nlines - 1) -
2498 			    s->commits.ncommits;
2499 			err = trigger_log_thread(view, 1);
2500 		}
2501 		break;
2502 	case KEY_ENTER:
2503 	case ' ':
2504 	case '\r':
2505 		if (s->selected_entry == NULL)
2506 			break;
2507 		if (view_is_parent_view(view))
2508 			begin_x = view_split_begin_x(view->begin_x);
2509 		err = open_diff_view_for_commit(&diff_view, begin_x,
2510 		    s->selected_entry->commit, s->selected_entry->id,
2511 		    view, s->repo);
2512 		if (err)
2513 			break;
2514 		view->focussed = 0;
2515 		diff_view->focussed = 1;
2516 		if (view_is_parent_view(view)) {
2517 			err = view_close_child(view);
2518 			if (err)
2519 				return err;
2520 			view_set_child(view, diff_view);
2521 			view->focus_child = 1;
2522 		} else
2523 			*new_view = diff_view;
2524 		break;
2525 	case 't':
2526 		if (s->selected_entry == NULL)
2527 			break;
2528 		if (view_is_parent_view(view))
2529 			begin_x = view_split_begin_x(view->begin_x);
2530 		err = browse_commit_tree(&tree_view, begin_x,
2531 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
2532 		    s->repo);
2533 		if (err)
2534 			break;
2535 		view->focussed = 0;
2536 		tree_view->focussed = 1;
2537 		if (view_is_parent_view(view)) {
2538 			err = view_close_child(view);
2539 			if (err)
2540 				return err;
2541 			view_set_child(view, tree_view);
2542 			view->focus_child = 1;
2543 		} else
2544 			*new_view = tree_view;
2545 		break;
2546 	case KEY_BACKSPACE:
2547 	case CTRL('l'):
2548 	case 'B':
2549 		if (ch == KEY_BACKSPACE &&
2550 		    got_path_is_root_dir(s->in_repo_path))
2551 			break;
2552 		err = stop_log_thread(s);
2553 		if (err)
2554 			return err;
2555 		if (ch == KEY_BACKSPACE) {
2556 			char *parent_path;
2557 			err = got_path_dirname(&parent_path, s->in_repo_path);
2558 			if (err)
2559 				return err;
2560 			free(s->in_repo_path);
2561 			s->in_repo_path = parent_path;
2562 			s->thread_args.in_repo_path = s->in_repo_path;
2563 		} else if (ch == CTRL('l')) {
2564 			struct got_object_id *start_id;
2565 			err = got_repo_match_object_id(&start_id, NULL,
2566 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
2567 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
2568 			if (err)
2569 				return err;
2570 			free(s->start_id);
2571 			s->start_id = start_id;
2572 			s->thread_args.start_id = s->start_id;
2573 		} else /* 'B' */
2574 			s->log_branches = !s->log_branches;
2575 
2576 		err = got_repo_open(&s->thread_args.repo,
2577 		    got_repo_get_path(s->repo), NULL);
2578 		if (err)
2579 			return err;
2580 		tog_free_refs();
2581 		err = tog_load_refs(s->repo);
2582 		if (err)
2583 			return err;
2584 		err = got_commit_graph_open(&s->thread_args.graph,
2585 		    s->in_repo_path, !s->log_branches);
2586 		if (err)
2587 			return err;
2588 		err = got_commit_graph_iter_start(s->thread_args.graph,
2589 		    s->start_id, s->repo, NULL, NULL);
2590 		if (err)
2591 			return err;
2592 		free_commits(&s->commits);
2593 		s->first_displayed_entry = NULL;
2594 		s->last_displayed_entry = NULL;
2595 		s->selected_entry = NULL;
2596 		s->selected = 0;
2597 		s->thread_args.log_complete = 0;
2598 		s->quit = 0;
2599 		s->thread_args.commits_needed = view->nlines;
2600 		break;
2601 	case 'r':
2602 		if (view_is_parent_view(view))
2603 			begin_x = view_split_begin_x(view->begin_x);
2604 		ref_view = view_open(view->nlines, view->ncols,
2605 		    view->begin_y, begin_x, TOG_VIEW_REF);
2606 		if (ref_view == NULL)
2607 			return got_error_from_errno("view_open");
2608 		err = open_ref_view(ref_view, s->repo);
2609 		if (err) {
2610 			view_close(ref_view);
2611 			return err;
2612 		}
2613 		view->focussed = 0;
2614 		ref_view->focussed = 1;
2615 		if (view_is_parent_view(view)) {
2616 			err = view_close_child(view);
2617 			if (err)
2618 				return err;
2619 			view_set_child(view, ref_view);
2620 			view->focus_child = 1;
2621 		} else
2622 			*new_view = ref_view;
2623 		break;
2624 	default:
2625 		break;
2626 	}
2627 
2628 	return err;
2629 }
2630 
2631 static const struct got_error *
2632 apply_unveil(const char *repo_path, const char *worktree_path)
2633 {
2634 	const struct got_error *error;
2635 
2636 #ifdef PROFILE
2637 	if (unveil("gmon.out", "rwc") != 0)
2638 		return got_error_from_errno2("unveil", "gmon.out");
2639 #endif
2640 	if (repo_path && unveil(repo_path, "r") != 0)
2641 		return got_error_from_errno2("unveil", repo_path);
2642 
2643 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
2644 		return got_error_from_errno2("unveil", worktree_path);
2645 
2646 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
2647 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
2648 
2649 	error = got_privsep_unveil_exec_helpers();
2650 	if (error != NULL)
2651 		return error;
2652 
2653 	if (unveil(NULL, NULL) != 0)
2654 		return got_error_from_errno("unveil");
2655 
2656 	return NULL;
2657 }
2658 
2659 static void
2660 init_curses(void)
2661 {
2662 	initscr();
2663 	cbreak();
2664 	halfdelay(1); /* Do fast refresh while initial view is loading. */
2665 	noecho();
2666 	nonl();
2667 	intrflush(stdscr, FALSE);
2668 	keypad(stdscr, TRUE);
2669 	curs_set(0);
2670 	if (getenv("TOG_COLORS") != NULL) {
2671 		start_color();
2672 		use_default_colors();
2673 	}
2674 	signal(SIGWINCH, tog_sigwinch);
2675 	signal(SIGPIPE, tog_sigpipe);
2676 	signal(SIGCONT, tog_sigcont);
2677 }
2678 
2679 static const struct got_error *
2680 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
2681     struct got_repository *repo, struct got_worktree *worktree)
2682 {
2683 	const struct got_error *err = NULL;
2684 
2685 	if (argc == 0) {
2686 		*in_repo_path = strdup("/");
2687 		if (*in_repo_path == NULL)
2688 			return got_error_from_errno("strdup");
2689 		return NULL;
2690 	}
2691 
2692 	if (worktree) {
2693 		const char *prefix = got_worktree_get_path_prefix(worktree);
2694 		char *p;
2695 
2696 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
2697 		if (err)
2698 			return err;
2699 		if (asprintf(in_repo_path, "%s%s%s", prefix,
2700 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
2701 		    p) == -1) {
2702 			err = got_error_from_errno("asprintf");
2703 			*in_repo_path = NULL;
2704 		}
2705 		free(p);
2706 	} else
2707 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
2708 
2709 	return err;
2710 }
2711 
2712 static const struct got_error *
2713 cmd_log(int argc, char *argv[])
2714 {
2715 	const struct got_error *error;
2716 	struct got_repository *repo = NULL;
2717 	struct got_worktree *worktree = NULL;
2718 	struct got_object_id *start_id = NULL;
2719 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
2720 	char *start_commit = NULL, *label = NULL;
2721 	struct got_reference *ref = NULL;
2722 	const char *head_ref_name = NULL;
2723 	int ch, log_branches = 0;
2724 	struct tog_view *view;
2725 
2726 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
2727 		switch (ch) {
2728 		case 'b':
2729 			log_branches = 1;
2730 			break;
2731 		case 'c':
2732 			start_commit = optarg;
2733 			break;
2734 		case 'r':
2735 			repo_path = realpath(optarg, NULL);
2736 			if (repo_path == NULL)
2737 				return got_error_from_errno2("realpath",
2738 				    optarg);
2739 			break;
2740 		default:
2741 			usage_log();
2742 			/* NOTREACHED */
2743 		}
2744 	}
2745 
2746 	argc -= optind;
2747 	argv += optind;
2748 
2749 	if (argc > 1)
2750 		usage_log();
2751 
2752 	if (repo_path == NULL) {
2753 		cwd = getcwd(NULL, 0);
2754 		if (cwd == NULL)
2755 			return got_error_from_errno("getcwd");
2756 		error = got_worktree_open(&worktree, cwd);
2757 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
2758 			goto done;
2759 		if (worktree)
2760 			repo_path =
2761 			    strdup(got_worktree_get_repo_path(worktree));
2762 		else
2763 			repo_path = strdup(cwd);
2764 		if (repo_path == NULL) {
2765 			error = got_error_from_errno("strdup");
2766 			goto done;
2767 		}
2768 	}
2769 
2770 	error = got_repo_open(&repo, repo_path, NULL);
2771 	if (error != NULL)
2772 		goto done;
2773 
2774 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
2775 	    repo, worktree);
2776 	if (error)
2777 		goto done;
2778 
2779 	init_curses();
2780 
2781 	error = apply_unveil(got_repo_get_path(repo),
2782 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
2783 	if (error)
2784 		goto done;
2785 
2786 	/* already loaded by tog_log_with_path()? */
2787 	if (TAILQ_EMPTY(&tog_refs)) {
2788 		error = tog_load_refs(repo);
2789 		if (error)
2790 			goto done;
2791 	}
2792 
2793 	if (start_commit == NULL) {
2794 		error = got_repo_match_object_id(&start_id, &label,
2795 		    worktree ? got_worktree_get_head_ref_name(worktree) :
2796 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
2797 		if (error)
2798 			goto done;
2799 		head_ref_name = label;
2800 	} else {
2801 		error = got_ref_open(&ref, repo, start_commit, 0);
2802 		if (error == NULL)
2803 			head_ref_name = got_ref_get_name(ref);
2804 		else if (error->code != GOT_ERR_NOT_REF)
2805 			goto done;
2806 		error = got_repo_match_object_id(&start_id, NULL,
2807 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
2808 		if (error)
2809 			goto done;
2810 	}
2811 
2812 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
2813 	if (view == NULL) {
2814 		error = got_error_from_errno("view_open");
2815 		goto done;
2816 	}
2817 	error = open_log_view(view, start_id, repo, head_ref_name,
2818 	    in_repo_path, log_branches);
2819 	if (error)
2820 		goto done;
2821 	if (worktree) {
2822 		/* Release work tree lock. */
2823 		got_worktree_close(worktree);
2824 		worktree = NULL;
2825 	}
2826 	error = view_loop(view);
2827 done:
2828 	free(in_repo_path);
2829 	free(repo_path);
2830 	free(cwd);
2831 	free(start_id);
2832 	free(label);
2833 	if (ref)
2834 		got_ref_close(ref);
2835 	if (repo) {
2836 		const struct got_error *close_err = got_repo_close(repo);
2837 		if (error == NULL)
2838 			error = close_err;
2839 	}
2840 	if (worktree)
2841 		got_worktree_close(worktree);
2842 	tog_free_refs();
2843 	return error;
2844 }
2845 
2846 __dead static void
2847 usage_diff(void)
2848 {
2849 	endwin();
2850 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
2851 	    "[-w] object1 object2\n", getprogname());
2852 	exit(1);
2853 }
2854 
2855 static int
2856 match_line(const char *line, regex_t *regex, size_t nmatch,
2857     regmatch_t *regmatch)
2858 {
2859 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
2860 }
2861 
2862 struct tog_color *
2863 match_color(struct tog_colors *colors, const char *line)
2864 {
2865 	struct tog_color *tc = NULL;
2866 
2867 	STAILQ_FOREACH(tc, colors, entry) {
2868 		if (match_line(line, &tc->regex, 0, NULL))
2869 			return tc;
2870 	}
2871 
2872 	return NULL;
2873 }
2874 
2875 static const struct got_error *
2876 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
2877     WINDOW *window, regmatch_t *regmatch)
2878 {
2879 	const struct got_error *err = NULL;
2880 	wchar_t *wline;
2881 	int width;
2882 	char *s;
2883 
2884 	*wtotal = 0;
2885 
2886 	s = strndup(line, regmatch->rm_so);
2887 	if (s == NULL)
2888 		return got_error_from_errno("strndup");
2889 
2890 	err = format_line(&wline, &width, s, wlimit, col_tab_align);
2891 	if (err) {
2892 		free(s);
2893 		return err;
2894 	}
2895 	waddwstr(window, wline);
2896 	free(wline);
2897 	free(s);
2898 	wlimit -= width;
2899 	*wtotal += width;
2900 
2901 	if (wlimit > 0) {
2902 		s = strndup(line + regmatch->rm_so,
2903 		    regmatch->rm_eo - regmatch->rm_so);
2904 		if (s == NULL) {
2905 			err = got_error_from_errno("strndup");
2906 			free(s);
2907 			return err;
2908 		}
2909 		err = format_line(&wline, &width, s, wlimit, col_tab_align);
2910 		if (err) {
2911 			free(s);
2912 			return err;
2913 		}
2914 		wattr_on(window, A_STANDOUT, NULL);
2915 		waddwstr(window, wline);
2916 		wattr_off(window, A_STANDOUT, NULL);
2917 		free(wline);
2918 		free(s);
2919 		wlimit -= width;
2920 		*wtotal += width;
2921 	}
2922 
2923 	if (wlimit > 0 && strlen(line) > regmatch->rm_eo) {
2924 		err = format_line(&wline, &width,
2925 		    line + regmatch->rm_eo, wlimit, col_tab_align);
2926 		if (err)
2927 			return err;
2928 		waddwstr(window, wline);
2929 		free(wline);
2930 		*wtotal += width;
2931 	}
2932 
2933 	return NULL;
2934 }
2935 
2936 static const struct got_error *
2937 draw_file(struct tog_view *view, const char *header)
2938 {
2939 	struct tog_diff_view_state *s = &view->state.diff;
2940 	regmatch_t *regmatch = &view->regmatch;
2941 	const struct got_error *err;
2942 	int nprinted = 0;
2943 	char *line;
2944 	size_t linesize = 0;
2945 	ssize_t linelen;
2946 	struct tog_color *tc;
2947 	wchar_t *wline;
2948 	int width;
2949 	int max_lines = view->nlines;
2950 	int nlines = s->nlines;
2951 	off_t line_offset;
2952 
2953 	line_offset = s->line_offsets[s->first_displayed_line - 1];
2954 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
2955 		return got_error_from_errno("fseek");
2956 
2957 	werase(view->window);
2958 
2959 	if (header) {
2960 		if (asprintf(&line, "[%d/%d] %s",
2961 		    s->first_displayed_line - 1 + s->selected_line, nlines,
2962 		    header) == -1)
2963 			return got_error_from_errno("asprintf");
2964 		err = format_line(&wline, &width, line, view->ncols, 0);
2965 		free(line);
2966 		if (err)
2967 			return err;
2968 
2969 		if (view_needs_focus_indication(view))
2970 			wstandout(view->window);
2971 		waddwstr(view->window, wline);
2972 		free(wline);
2973 		wline = NULL;
2974 		if (view_needs_focus_indication(view))
2975 			wstandend(view->window);
2976 		if (width <= view->ncols - 1)
2977 			waddch(view->window, '\n');
2978 
2979 		if (max_lines <= 1)
2980 			return NULL;
2981 		max_lines--;
2982 	}
2983 
2984 	s->eof = 0;
2985 	line = NULL;
2986 	while (max_lines > 0 && nprinted < max_lines) {
2987 		linelen = getline(&line, &linesize, s->f);
2988 		if (linelen == -1) {
2989 			if (feof(s->f)) {
2990 				s->eof = 1;
2991 				break;
2992 			}
2993 			free(line);
2994 			return got_ferror(s->f, GOT_ERR_IO);
2995 		}
2996 
2997 		tc = match_color(&s->colors, line);
2998 		if (tc)
2999 			wattr_on(view->window,
3000 			    COLOR_PAIR(tc->colorpair), NULL);
3001 		if (s->first_displayed_line + nprinted == s->matched_line &&
3002 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3003 			err = add_matched_line(&width, line, view->ncols, 0,
3004 			    view->window, regmatch);
3005 			if (err) {
3006 				free(line);
3007 				return err;
3008 			}
3009 		} else {
3010 			err = format_line(&wline, &width, line, view->ncols, 0);
3011 			if (err) {
3012 				free(line);
3013 				return err;
3014 			}
3015 			waddwstr(view->window, wline);
3016 			free(wline);
3017 			wline = NULL;
3018 		}
3019 		if (tc)
3020 			wattr_off(view->window,
3021 			    COLOR_PAIR(tc->colorpair), NULL);
3022 		if (width <= view->ncols - 1)
3023 			waddch(view->window, '\n');
3024 		nprinted++;
3025 	}
3026 	free(line);
3027 	if (nprinted >= 1)
3028 		s->last_displayed_line = s->first_displayed_line +
3029 		    (nprinted - 1);
3030 	else
3031 		s->last_displayed_line = s->first_displayed_line;
3032 
3033 	view_vborder(view);
3034 
3035 	if (s->eof) {
3036 		while (nprinted < view->nlines) {
3037 			waddch(view->window, '\n');
3038 			nprinted++;
3039 		}
3040 
3041 		err = format_line(&wline, &width, TOG_EOF_STRING, view->ncols, 0);
3042 		if (err) {
3043 			return err;
3044 		}
3045 
3046 		wstandout(view->window);
3047 		waddwstr(view->window, wline);
3048 		free(wline);
3049 		wline = NULL;
3050 		wstandend(view->window);
3051 	}
3052 
3053 	return NULL;
3054 }
3055 
3056 static char *
3057 get_datestr(time_t *time, char *datebuf)
3058 {
3059 	struct tm mytm, *tm;
3060 	char *p, *s;
3061 
3062 	tm = gmtime_r(time, &mytm);
3063 	if (tm == NULL)
3064 		return NULL;
3065 	s = asctime_r(tm, datebuf);
3066 	if (s == NULL)
3067 		return NULL;
3068 	p = strchr(s, '\n');
3069 	if (p)
3070 		*p = '\0';
3071 	return s;
3072 }
3073 
3074 static const struct got_error *
3075 get_changed_paths(struct got_pathlist_head *paths,
3076     struct got_commit_object *commit, struct got_repository *repo)
3077 {
3078 	const struct got_error *err = NULL;
3079 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
3080 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
3081 	struct got_object_qid *qid;
3082 
3083 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3084 	if (qid != NULL) {
3085 		struct got_commit_object *pcommit;
3086 		err = got_object_open_as_commit(&pcommit, repo,
3087 		    qid->id);
3088 		if (err)
3089 			return err;
3090 
3091 		tree_id1 = got_object_id_dup(
3092 		    got_object_commit_get_tree_id(pcommit));
3093 		if (tree_id1 == NULL) {
3094 			got_object_commit_close(pcommit);
3095 			return got_error_from_errno("got_object_id_dup");
3096 		}
3097 		got_object_commit_close(pcommit);
3098 
3099 	}
3100 
3101 	if (tree_id1) {
3102 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
3103 		if (err)
3104 			goto done;
3105 	}
3106 
3107 	tree_id2 = got_object_commit_get_tree_id(commit);
3108 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
3109 	if (err)
3110 		goto done;
3111 
3112 	err = got_diff_tree(tree1, tree2, "", "", repo,
3113 	    got_diff_tree_collect_changed_paths, paths, 0);
3114 done:
3115 	if (tree1)
3116 		got_object_tree_close(tree1);
3117 	if (tree2)
3118 		got_object_tree_close(tree2);
3119 	free(tree_id1);
3120 	return err;
3121 }
3122 
3123 static const struct got_error *
3124 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
3125 {
3126 	off_t *p;
3127 
3128 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
3129 	if (p == NULL)
3130 		return got_error_from_errno("reallocarray");
3131 	*line_offsets = p;
3132 	(*line_offsets)[*nlines] = off;
3133 	(*nlines)++;
3134 	return NULL;
3135 }
3136 
3137 static const struct got_error *
3138 write_commit_info(off_t **line_offsets, size_t *nlines,
3139     struct got_object_id *commit_id, struct got_reflist_head *refs,
3140     struct got_repository *repo, FILE *outfile)
3141 {
3142 	const struct got_error *err = NULL;
3143 	char datebuf[26], *datestr;
3144 	struct got_commit_object *commit;
3145 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
3146 	time_t committer_time;
3147 	const char *author, *committer;
3148 	char *refs_str = NULL;
3149 	struct got_pathlist_head changed_paths;
3150 	struct got_pathlist_entry *pe;
3151 	off_t outoff = 0;
3152 	int n;
3153 
3154 	TAILQ_INIT(&changed_paths);
3155 
3156 	if (refs) {
3157 		err = build_refs_str(&refs_str, refs, commit_id, repo);
3158 		if (err)
3159 			return err;
3160 	}
3161 
3162 	err = got_object_open_as_commit(&commit, repo, commit_id);
3163 	if (err)
3164 		return err;
3165 
3166 	err = got_object_id_str(&id_str, commit_id);
3167 	if (err) {
3168 		err = got_error_from_errno("got_object_id_str");
3169 		goto done;
3170 	}
3171 
3172 	err = add_line_offset(line_offsets, nlines, 0);
3173 	if (err)
3174 		goto done;
3175 
3176 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
3177 	    refs_str ? refs_str : "", refs_str ? ")" : "");
3178 	if (n < 0) {
3179 		err = got_error_from_errno("fprintf");
3180 		goto done;
3181 	}
3182 	outoff += n;
3183 	err = add_line_offset(line_offsets, nlines, outoff);
3184 	if (err)
3185 		goto done;
3186 
3187 	n = fprintf(outfile, "from: %s\n",
3188 	    got_object_commit_get_author(commit));
3189 	if (n < 0) {
3190 		err = got_error_from_errno("fprintf");
3191 		goto done;
3192 	}
3193 	outoff += n;
3194 	err = add_line_offset(line_offsets, nlines, outoff);
3195 	if (err)
3196 		goto done;
3197 
3198 	committer_time = got_object_commit_get_committer_time(commit);
3199 	datestr = get_datestr(&committer_time, datebuf);
3200 	if (datestr) {
3201 		n = fprintf(outfile, "date: %s UTC\n", datestr);
3202 		if (n < 0) {
3203 			err = got_error_from_errno("fprintf");
3204 			goto done;
3205 		}
3206 		outoff += n;
3207 		err = add_line_offset(line_offsets, nlines, outoff);
3208 		if (err)
3209 			goto done;
3210 	}
3211 	author = got_object_commit_get_author(commit);
3212 	committer = got_object_commit_get_committer(commit);
3213 	if (strcmp(author, committer) != 0) {
3214 		n = fprintf(outfile, "via: %s\n", committer);
3215 		if (n < 0) {
3216 			err = got_error_from_errno("fprintf");
3217 			goto done;
3218 		}
3219 		outoff += n;
3220 		err = add_line_offset(line_offsets, nlines, outoff);
3221 		if (err)
3222 			goto done;
3223 	}
3224 	err = got_object_commit_get_logmsg(&logmsg, commit);
3225 	if (err)
3226 		goto done;
3227 	s = logmsg;
3228 	while ((line = strsep(&s, "\n")) != NULL) {
3229 		n = fprintf(outfile, "%s\n", line);
3230 		if (n < 0) {
3231 			err = got_error_from_errno("fprintf");
3232 			goto done;
3233 		}
3234 		outoff += n;
3235 		err = add_line_offset(line_offsets, nlines, outoff);
3236 		if (err)
3237 			goto done;
3238 	}
3239 
3240 	err = get_changed_paths(&changed_paths, commit, repo);
3241 	if (err)
3242 		goto done;
3243 	TAILQ_FOREACH(pe, &changed_paths, entry) {
3244 		struct got_diff_changed_path *cp = pe->data;
3245 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
3246 		if (n < 0) {
3247 			err = got_error_from_errno("fprintf");
3248 			goto done;
3249 		}
3250 		outoff += n;
3251 		err = add_line_offset(line_offsets, nlines, outoff);
3252 		if (err)
3253 			goto done;
3254 		free((char *)pe->path);
3255 		free(pe->data);
3256 	}
3257 
3258 	fputc('\n', outfile);
3259 	outoff++;
3260 	err = add_line_offset(line_offsets, nlines, outoff);
3261 done:
3262 	got_pathlist_free(&changed_paths);
3263 	free(id_str);
3264 	free(logmsg);
3265 	free(refs_str);
3266 	got_object_commit_close(commit);
3267 	if (err) {
3268 		free(*line_offsets);
3269 		*line_offsets = NULL;
3270 		*nlines = 0;
3271 	}
3272 	return err;
3273 }
3274 
3275 static const struct got_error *
3276 create_diff(struct tog_diff_view_state *s)
3277 {
3278 	const struct got_error *err = NULL;
3279 	FILE *f = NULL;
3280 	int obj_type;
3281 
3282 	free(s->line_offsets);
3283 	s->line_offsets = malloc(sizeof(off_t));
3284 	if (s->line_offsets == NULL)
3285 		return got_error_from_errno("malloc");
3286 	s->nlines = 0;
3287 
3288 	f = got_opentemp();
3289 	if (f == NULL) {
3290 		err = got_error_from_errno("got_opentemp");
3291 		goto done;
3292 	}
3293 	if (s->f && fclose(s->f) == EOF) {
3294 		err = got_error_from_errno("fclose");
3295 		goto done;
3296 	}
3297 	s->f = f;
3298 
3299 	if (s->id1)
3300 		err = got_object_get_type(&obj_type, s->repo, s->id1);
3301 	else
3302 		err = got_object_get_type(&obj_type, s->repo, s->id2);
3303 	if (err)
3304 		goto done;
3305 
3306 	switch (obj_type) {
3307 	case GOT_OBJ_TYPE_BLOB:
3308 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
3309 		    s->id1, s->id2, s->label1, s->label2, s->diff_context,
3310 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
3311 		break;
3312 	case GOT_OBJ_TYPE_TREE:
3313 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
3314 		    s->id1, s->id2, "", "", s->diff_context,
3315 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
3316 		break;
3317 	case GOT_OBJ_TYPE_COMMIT: {
3318 		const struct got_object_id_queue *parent_ids;
3319 		struct got_object_qid *pid;
3320 		struct got_commit_object *commit2;
3321 		struct got_reflist_head *refs;
3322 
3323 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
3324 		if (err)
3325 			goto done;
3326 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
3327 		/* Show commit info if we're diffing to a parent/root commit. */
3328 		if (s->id1 == NULL) {
3329 			err = write_commit_info(&s->line_offsets, &s->nlines,
3330 			    s->id2, refs, s->repo, s->f);
3331 			if (err)
3332 				goto done;
3333 		} else {
3334 			parent_ids = got_object_commit_get_parent_ids(commit2);
3335 			STAILQ_FOREACH(pid, parent_ids, entry) {
3336 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
3337 					err = write_commit_info(
3338 					    &s->line_offsets, &s->nlines,
3339 					    s->id2, refs, s->repo, s->f);
3340 					if (err)
3341 						goto done;
3342 					break;
3343 				}
3344 			}
3345 		}
3346 		got_object_commit_close(commit2);
3347 
3348 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
3349 		    s->id1, s->id2, s->diff_context, s->ignore_whitespace,
3350 		    s->force_text_diff, s->repo, s->f);
3351 		break;
3352 	}
3353 	default:
3354 		err = got_error(GOT_ERR_OBJ_TYPE);
3355 		break;
3356 	}
3357 	if (err)
3358 		goto done;
3359 done:
3360 	if (s->f && fflush(s->f) != 0 && err == NULL)
3361 		err = got_error_from_errno("fflush");
3362 	return err;
3363 }
3364 
3365 static void
3366 diff_view_indicate_progress(struct tog_view *view)
3367 {
3368 	mvwaddstr(view->window, 0, 0, "diffing...");
3369 	update_panels();
3370 	doupdate();
3371 }
3372 
3373 static const struct got_error *
3374 search_start_diff_view(struct tog_view *view)
3375 {
3376 	struct tog_diff_view_state *s = &view->state.diff;
3377 
3378 	s->matched_line = 0;
3379 	return NULL;
3380 }
3381 
3382 static const struct got_error *
3383 search_next_diff_view(struct tog_view *view)
3384 {
3385 	struct tog_diff_view_state *s = &view->state.diff;
3386 	int lineno;
3387 	char *line = NULL;
3388 	size_t linesize = 0;
3389 	ssize_t linelen;
3390 
3391 	if (!view->searching) {
3392 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
3393 		return NULL;
3394 	}
3395 
3396 	if (s->matched_line) {
3397 		if (view->searching == TOG_SEARCH_FORWARD)
3398 			lineno = s->matched_line + 1;
3399 		else
3400 			lineno = s->matched_line - 1;
3401 	} else {
3402 		if (view->searching == TOG_SEARCH_FORWARD)
3403 			lineno = 1;
3404 		else
3405 			lineno = s->nlines;
3406 	}
3407 
3408 	while (1) {
3409 		off_t offset;
3410 
3411 		if (lineno <= 0 || lineno > s->nlines) {
3412 			if (s->matched_line == 0) {
3413 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3414 				break;
3415 			}
3416 
3417 			if (view->searching == TOG_SEARCH_FORWARD)
3418 				lineno = 1;
3419 			else
3420 				lineno = s->nlines;
3421 		}
3422 
3423 		offset = s->line_offsets[lineno - 1];
3424 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
3425 			free(line);
3426 			return got_error_from_errno("fseeko");
3427 		}
3428 		linelen = getline(&line, &linesize, s->f);
3429 		if (linelen != -1 &&
3430 		    match_line(line, &view->regex, 1, &view->regmatch)) {
3431 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3432 			s->matched_line = lineno;
3433 			break;
3434 		}
3435 		if (view->searching == TOG_SEARCH_FORWARD)
3436 			lineno++;
3437 		else
3438 			lineno--;
3439 	}
3440 	free(line);
3441 
3442 	if (s->matched_line) {
3443 		s->first_displayed_line = s->matched_line;
3444 		s->selected_line = 1;
3445 	}
3446 
3447 	return NULL;
3448 }
3449 
3450 static const struct got_error *
3451 open_diff_view(struct tog_view *view, struct got_object_id *id1,
3452     struct got_object_id *id2, const char *label1, const char *label2,
3453     int diff_context, int ignore_whitespace, int force_text_diff,
3454     struct tog_view *log_view, struct got_repository *repo)
3455 {
3456 	const struct got_error *err;
3457 	struct tog_diff_view_state *s = &view->state.diff;
3458 
3459 	if (id1 != NULL && id2 != NULL) {
3460 	    int type1, type2;
3461 	    err = got_object_get_type(&type1, repo, id1);
3462 	    if (err)
3463 		return err;
3464 	    err = got_object_get_type(&type2, repo, id2);
3465 	    if (err)
3466 		return err;
3467 
3468 	    if (type1 != type2)
3469 		return got_error(GOT_ERR_OBJ_TYPE);
3470 	}
3471 	s->first_displayed_line = 1;
3472 	s->last_displayed_line = view->nlines;
3473 	s->selected_line = 1;
3474 	s->repo = repo;
3475 	s->id1 = id1;
3476 	s->id2 = id2;
3477 	s->label1 = label1;
3478 	s->label2 = label2;
3479 
3480 	if (id1) {
3481 		s->id1 = got_object_id_dup(id1);
3482 		if (s->id1 == NULL)
3483 			return got_error_from_errno("got_object_id_dup");
3484 	} else
3485 		s->id1 = NULL;
3486 
3487 	s->id2 = got_object_id_dup(id2);
3488 	if (s->id2 == NULL) {
3489 		free(s->id1);
3490 		s->id1 = NULL;
3491 		return got_error_from_errno("got_object_id_dup");
3492 	}
3493 	s->f = NULL;
3494 	s->first_displayed_line = 1;
3495 	s->last_displayed_line = view->nlines;
3496 	s->diff_context = diff_context;
3497 	s->ignore_whitespace = ignore_whitespace;
3498 	s->force_text_diff = force_text_diff;
3499 	s->log_view = log_view;
3500 	s->repo = repo;
3501 
3502 	STAILQ_INIT(&s->colors);
3503 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3504 		err = add_color(&s->colors,
3505 		    "^-", TOG_COLOR_DIFF_MINUS,
3506 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
3507 		if (err)
3508 			return err;
3509 		err = add_color(&s->colors, "^\\+",
3510 		    TOG_COLOR_DIFF_PLUS,
3511 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
3512 		if (err) {
3513 			free_colors(&s->colors);
3514 			return err;
3515 		}
3516 		err = add_color(&s->colors,
3517 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
3518 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
3519 		if (err) {
3520 			free_colors(&s->colors);
3521 			return err;
3522 		}
3523 
3524 		err = add_color(&s->colors,
3525 		    "^(commit [0-9a-f]|(blob|file) [-+] |[MDmA]  [^ ])",
3526 		    TOG_COLOR_DIFF_META,
3527 		    get_color_value("TOG_COLOR_DIFF_META"));
3528 		if (err) {
3529 			free_colors(&s->colors);
3530 			return err;
3531 		}
3532 
3533 		err = add_color(&s->colors,
3534 		    "^(from|via): ", TOG_COLOR_AUTHOR,
3535 		    get_color_value("TOG_COLOR_AUTHOR"));
3536 		if (err) {
3537 			free_colors(&s->colors);
3538 			return err;
3539 		}
3540 
3541 		err = add_color(&s->colors,
3542 		    "^date: ", TOG_COLOR_DATE,
3543 		    get_color_value("TOG_COLOR_DATE"));
3544 		if (err) {
3545 			free_colors(&s->colors);
3546 			return err;
3547 		}
3548 	}
3549 
3550 	if (log_view && view_is_splitscreen(view))
3551 		show_log_view(log_view); /* draw vborder */
3552 	diff_view_indicate_progress(view);
3553 
3554 	s->line_offsets = NULL;
3555 	s->nlines = 0;
3556 	err = create_diff(s);
3557 	if (err) {
3558 		free(s->id1);
3559 		s->id1 = NULL;
3560 		free(s->id2);
3561 		s->id2 = NULL;
3562 		free_colors(&s->colors);
3563 		return err;
3564 	}
3565 
3566 	view->show = show_diff_view;
3567 	view->input = input_diff_view;
3568 	view->close = close_diff_view;
3569 	view->search_start = search_start_diff_view;
3570 	view->search_next = search_next_diff_view;
3571 
3572 	return NULL;
3573 }
3574 
3575 static const struct got_error *
3576 close_diff_view(struct tog_view *view)
3577 {
3578 	const struct got_error *err = NULL;
3579 	struct tog_diff_view_state *s = &view->state.diff;
3580 
3581 	free(s->id1);
3582 	s->id1 = NULL;
3583 	free(s->id2);
3584 	s->id2 = NULL;
3585 	if (s->f && fclose(s->f) == EOF)
3586 		err = got_error_from_errno("fclose");
3587 	free_colors(&s->colors);
3588 	free(s->line_offsets);
3589 	s->line_offsets = NULL;
3590 	s->nlines = 0;
3591 	return err;
3592 }
3593 
3594 static const struct got_error *
3595 show_diff_view(struct tog_view *view)
3596 {
3597 	const struct got_error *err;
3598 	struct tog_diff_view_state *s = &view->state.diff;
3599 	char *id_str1 = NULL, *id_str2, *header;
3600 	const char *label1, *label2;
3601 
3602 	if (s->id1) {
3603 		err = got_object_id_str(&id_str1, s->id1);
3604 		if (err)
3605 			return err;
3606 		label1 = s->label1 ? : id_str1;
3607 	} else
3608 		label1 = "/dev/null";
3609 
3610 	err = got_object_id_str(&id_str2, s->id2);
3611 	if (err)
3612 		return err;
3613 	label2 = s->label2 ? : id_str2;
3614 
3615 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
3616 		err = got_error_from_errno("asprintf");
3617 		free(id_str1);
3618 		free(id_str2);
3619 		return err;
3620 	}
3621 	free(id_str1);
3622 	free(id_str2);
3623 
3624 	err = draw_file(view, header);
3625 	free(header);
3626 	return err;
3627 }
3628 
3629 static const struct got_error *
3630 set_selected_commit(struct tog_diff_view_state *s,
3631     struct commit_queue_entry *entry)
3632 {
3633 	const struct got_error *err;
3634 	const struct got_object_id_queue *parent_ids;
3635 	struct got_commit_object *selected_commit;
3636 	struct got_object_qid *pid;
3637 
3638 	free(s->id2);
3639 	s->id2 = got_object_id_dup(entry->id);
3640 	if (s->id2 == NULL)
3641 		return got_error_from_errno("got_object_id_dup");
3642 
3643 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
3644 	if (err)
3645 		return err;
3646 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
3647 	free(s->id1);
3648 	pid = STAILQ_FIRST(parent_ids);
3649 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
3650 	got_object_commit_close(selected_commit);
3651 	return NULL;
3652 }
3653 
3654 static const struct got_error *
3655 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
3656 {
3657 	const struct got_error *err = NULL;
3658 	struct tog_diff_view_state *s = &view->state.diff;
3659 	struct tog_log_view_state *ls;
3660 	struct commit_queue_entry *old_selected_entry;
3661 	char *line = NULL;
3662 	size_t linesize = 0;
3663 	ssize_t linelen;
3664 	int i;
3665 
3666 	switch (ch) {
3667 	case 'a':
3668 	case 'w':
3669 		if (ch == 'a')
3670 			s->force_text_diff = !s->force_text_diff;
3671 		if (ch == 'w')
3672 			s->ignore_whitespace = !s->ignore_whitespace;
3673 		wclear(view->window);
3674 		s->first_displayed_line = 1;
3675 		s->last_displayed_line = view->nlines;
3676 		diff_view_indicate_progress(view);
3677 		err = create_diff(s);
3678 		break;
3679 	case 'g':
3680 	case KEY_HOME:
3681 		s->first_displayed_line = 1;
3682 		break;
3683 	case 'G':
3684 	case KEY_END:
3685 		if (s->eof)
3686 			break;
3687 
3688 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
3689 		s->eof = 1;
3690 		break;
3691 	case 'k':
3692 	case KEY_UP:
3693 		if (s->first_displayed_line > 1)
3694 			s->first_displayed_line--;
3695 		break;
3696 	case KEY_PPAGE:
3697 	case CTRL('b'):
3698 		if (s->first_displayed_line == 1)
3699 			break;
3700 		i = 0;
3701 		while (i++ < view->nlines - 1 &&
3702 		    s->first_displayed_line > 1)
3703 			s->first_displayed_line--;
3704 		break;
3705 	case 'j':
3706 	case KEY_DOWN:
3707 		if (!s->eof)
3708 			s->first_displayed_line++;
3709 		break;
3710 	case KEY_NPAGE:
3711 	case CTRL('f'):
3712 	case ' ':
3713 		if (s->eof)
3714 			break;
3715 		i = 0;
3716 		while (!s->eof && i++ < view->nlines - 1) {
3717 			linelen = getline(&line, &linesize, s->f);
3718 			s->first_displayed_line++;
3719 			if (linelen == -1) {
3720 				if (feof(s->f)) {
3721 					s->eof = 1;
3722 				} else
3723 					err = got_ferror(s->f, GOT_ERR_IO);
3724 				break;
3725 			}
3726 		}
3727 		free(line);
3728 		break;
3729 	case '[':
3730 		if (s->diff_context > 0) {
3731 			s->diff_context--;
3732 			diff_view_indicate_progress(view);
3733 			err = create_diff(s);
3734 			if (s->first_displayed_line + view->nlines - 1 >
3735 			    s->nlines) {
3736 				s->first_displayed_line = 1;
3737 				s->last_displayed_line = view->nlines;
3738 			}
3739 		}
3740 		break;
3741 	case ']':
3742 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
3743 			s->diff_context++;
3744 			diff_view_indicate_progress(view);
3745 			err = create_diff(s);
3746 		}
3747 		break;
3748 	case '<':
3749 	case ',':
3750 		if (s->log_view == NULL)
3751 			break;
3752 		ls = &s->log_view->state.log;
3753 		old_selected_entry = ls->selected_entry;
3754 
3755 		err = input_log_view(NULL, s->log_view, KEY_UP);
3756 		if (err)
3757 			break;
3758 
3759 		if (old_selected_entry == ls->selected_entry)
3760 			break;
3761 
3762 		err = set_selected_commit(s, ls->selected_entry);
3763 		if (err)
3764 			break;
3765 
3766 		s->first_displayed_line = 1;
3767 		s->last_displayed_line = view->nlines;
3768 
3769 		diff_view_indicate_progress(view);
3770 		err = create_diff(s);
3771 		break;
3772 	case '>':
3773 	case '.':
3774 		if (s->log_view == NULL)
3775 			break;
3776 		ls = &s->log_view->state.log;
3777 		old_selected_entry = ls->selected_entry;
3778 
3779 		err = input_log_view(NULL, s->log_view, KEY_DOWN);
3780 		if (err)
3781 			break;
3782 
3783 		if (old_selected_entry == ls->selected_entry)
3784 			break;
3785 
3786 		err = set_selected_commit(s, ls->selected_entry);
3787 		if (err)
3788 			break;
3789 
3790 		s->first_displayed_line = 1;
3791 		s->last_displayed_line = view->nlines;
3792 
3793 		diff_view_indicate_progress(view);
3794 		err = create_diff(s);
3795 		break;
3796 	default:
3797 		break;
3798 	}
3799 
3800 	return err;
3801 }
3802 
3803 static const struct got_error *
3804 cmd_diff(int argc, char *argv[])
3805 {
3806 	const struct got_error *error = NULL;
3807 	struct got_repository *repo = NULL;
3808 	struct got_worktree *worktree = NULL;
3809 	struct got_object_id *id1 = NULL, *id2 = NULL;
3810 	char *repo_path = NULL, *cwd = NULL;
3811 	char *id_str1 = NULL, *id_str2 = NULL;
3812 	char *label1 = NULL, *label2 = NULL;
3813 	int diff_context = 3, ignore_whitespace = 0;
3814 	int ch, force_text_diff = 0;
3815 	const char *errstr;
3816 	struct tog_view *view;
3817 
3818 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
3819 		switch (ch) {
3820 		case 'a':
3821 			force_text_diff = 1;
3822 			break;
3823 		case 'C':
3824 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
3825 			    &errstr);
3826 			if (errstr != NULL)
3827 				err(1, "-C option %s", errstr);
3828 			break;
3829 		case 'r':
3830 			repo_path = realpath(optarg, NULL);
3831 			if (repo_path == NULL)
3832 				return got_error_from_errno2("realpath",
3833 				    optarg);
3834 			got_path_strip_trailing_slashes(repo_path);
3835 			break;
3836 		case 'w':
3837 			ignore_whitespace = 1;
3838 			break;
3839 		default:
3840 			usage_diff();
3841 			/* NOTREACHED */
3842 		}
3843 	}
3844 
3845 	argc -= optind;
3846 	argv += optind;
3847 
3848 	if (argc == 0) {
3849 		usage_diff(); /* TODO show local worktree changes */
3850 	} else if (argc == 2) {
3851 		id_str1 = argv[0];
3852 		id_str2 = argv[1];
3853 	} else
3854 		usage_diff();
3855 
3856 	if (repo_path == NULL) {
3857 		cwd = getcwd(NULL, 0);
3858 		if (cwd == NULL)
3859 			return got_error_from_errno("getcwd");
3860 		error = got_worktree_open(&worktree, cwd);
3861 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3862 			goto done;
3863 		if (worktree)
3864 			repo_path =
3865 			    strdup(got_worktree_get_repo_path(worktree));
3866 		else
3867 			repo_path = strdup(cwd);
3868 		if (repo_path == NULL) {
3869 			error = got_error_from_errno("strdup");
3870 			goto done;
3871 		}
3872 	}
3873 
3874 	error = got_repo_open(&repo, repo_path, NULL);
3875 	if (error)
3876 		goto done;
3877 
3878 	init_curses();
3879 
3880 	error = apply_unveil(got_repo_get_path(repo), NULL);
3881 	if (error)
3882 		goto done;
3883 
3884 	error = tog_load_refs(repo);
3885 	if (error)
3886 		goto done;
3887 
3888 	error = got_repo_match_object_id(&id1, &label1, id_str1,
3889 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
3890 	if (error)
3891 		goto done;
3892 
3893 	error = got_repo_match_object_id(&id2, &label2, id_str2,
3894 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
3895 	if (error)
3896 		goto done;
3897 
3898 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
3899 	if (view == NULL) {
3900 		error = got_error_from_errno("view_open");
3901 		goto done;
3902 	}
3903 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
3904 	    ignore_whitespace, force_text_diff, NULL,  repo);
3905 	if (error)
3906 		goto done;
3907 	error = view_loop(view);
3908 done:
3909 	free(label1);
3910 	free(label2);
3911 	free(repo_path);
3912 	free(cwd);
3913 	if (repo) {
3914 		const struct got_error *close_err = got_repo_close(repo);
3915 		if (error == NULL)
3916 			error = close_err;
3917 	}
3918 	if (worktree)
3919 		got_worktree_close(worktree);
3920 	tog_free_refs();
3921 	return error;
3922 }
3923 
3924 __dead static void
3925 usage_blame(void)
3926 {
3927 	endwin();
3928 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
3929 	    getprogname());
3930 	exit(1);
3931 }
3932 
3933 struct tog_blame_line {
3934 	int annotated;
3935 	struct got_object_id *id;
3936 };
3937 
3938 static const struct got_error *
3939 draw_blame(struct tog_view *view)
3940 {
3941 	struct tog_blame_view_state *s = &view->state.blame;
3942 	struct tog_blame *blame = &s->blame;
3943 	regmatch_t *regmatch = &view->regmatch;
3944 	const struct got_error *err;
3945 	int lineno = 0, nprinted = 0;
3946 	char *line = NULL;
3947 	size_t linesize = 0;
3948 	ssize_t linelen;
3949 	wchar_t *wline;
3950 	int width;
3951 	struct tog_blame_line *blame_line;
3952 	struct got_object_id *prev_id = NULL;
3953 	char *id_str;
3954 	struct tog_color *tc;
3955 
3956 	err = got_object_id_str(&id_str, s->blamed_commit->id);
3957 	if (err)
3958 		return err;
3959 
3960 	rewind(blame->f);
3961 	werase(view->window);
3962 
3963 	if (asprintf(&line, "commit %s", id_str) == -1) {
3964 		err = got_error_from_errno("asprintf");
3965 		free(id_str);
3966 		return err;
3967 	}
3968 
3969 	err = format_line(&wline, &width, line, view->ncols, 0);
3970 	free(line);
3971 	line = NULL;
3972 	if (err)
3973 		return err;
3974 	if (view_needs_focus_indication(view))
3975 		wstandout(view->window);
3976 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
3977 	if (tc)
3978 		wattr_on(view->window,
3979 		    COLOR_PAIR(tc->colorpair), NULL);
3980 	waddwstr(view->window, wline);
3981 	if (tc)
3982 		wattr_off(view->window,
3983 		    COLOR_PAIR(tc->colorpair), NULL);
3984 	if (view_needs_focus_indication(view))
3985 		wstandend(view->window);
3986 	free(wline);
3987 	wline = NULL;
3988 	if (width < view->ncols - 1)
3989 		waddch(view->window, '\n');
3990 
3991 	if (asprintf(&line, "[%d/%d] %s%s",
3992 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
3993 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
3994 		free(id_str);
3995 		return got_error_from_errno("asprintf");
3996 	}
3997 	free(id_str);
3998 	err = format_line(&wline, &width, line, view->ncols, 0);
3999 	free(line);
4000 	line = NULL;
4001 	if (err)
4002 		return err;
4003 	waddwstr(view->window, wline);
4004 	free(wline);
4005 	wline = NULL;
4006 	if (width < view->ncols - 1)
4007 		waddch(view->window, '\n');
4008 
4009 	s->eof = 0;
4010 	while (nprinted < view->nlines - 2) {
4011 		linelen = getline(&line, &linesize, blame->f);
4012 		if (linelen == -1) {
4013 			if (feof(blame->f)) {
4014 				s->eof = 1;
4015 				break;
4016 			}
4017 			free(line);
4018 			return got_ferror(blame->f, GOT_ERR_IO);
4019 		}
4020 		if (++lineno < s->first_displayed_line)
4021 			continue;
4022 
4023 		if (view->focussed && nprinted == s->selected_line - 1)
4024 			wstandout(view->window);
4025 
4026 		if (blame->nlines > 0) {
4027 			blame_line = &blame->lines[lineno - 1];
4028 			if (blame_line->annotated && prev_id &&
4029 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
4030 			    !(view->focussed &&
4031 			    nprinted == s->selected_line - 1)) {
4032 				waddstr(view->window, "        ");
4033 			} else if (blame_line->annotated) {
4034 				char *id_str;
4035 				err = got_object_id_str(&id_str, blame_line->id);
4036 				if (err) {
4037 					free(line);
4038 					return err;
4039 				}
4040 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4041 				if (tc)
4042 					wattr_on(view->window,
4043 					    COLOR_PAIR(tc->colorpair), NULL);
4044 				wprintw(view->window, "%.8s", id_str);
4045 				if (tc)
4046 					wattr_off(view->window,
4047 					    COLOR_PAIR(tc->colorpair), NULL);
4048 				free(id_str);
4049 				prev_id = blame_line->id;
4050 			} else {
4051 				waddstr(view->window, "........");
4052 				prev_id = NULL;
4053 			}
4054 		} else {
4055 			waddstr(view->window, "........");
4056 			prev_id = NULL;
4057 		}
4058 
4059 		if (view->focussed && nprinted == s->selected_line - 1)
4060 			wstandend(view->window);
4061 		waddstr(view->window, " ");
4062 
4063 		if (view->ncols <= 9) {
4064 			width = 9;
4065 			wline = wcsdup(L"");
4066 			if (wline == NULL) {
4067 				err = got_error_from_errno("wcsdup");
4068 				free(line);
4069 				return err;
4070 			}
4071 		} else if (s->first_displayed_line + nprinted ==
4072 		    s->matched_line &&
4073 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4074 			err = add_matched_line(&width, line, view->ncols - 9, 9,
4075 			    view->window, regmatch);
4076 			if (err) {
4077 				free(line);
4078 				return err;
4079 			}
4080 			width += 9;
4081 		} else {
4082 			err = format_line(&wline, &width, line,
4083 			    view->ncols - 9, 9);
4084 			waddwstr(view->window, wline);
4085 			free(wline);
4086 			wline = NULL;
4087 			width += 9;
4088 		}
4089 
4090 		if (width <= view->ncols - 1)
4091 			waddch(view->window, '\n');
4092 		if (++nprinted == 1)
4093 			s->first_displayed_line = lineno;
4094 	}
4095 	free(line);
4096 	s->last_displayed_line = lineno;
4097 
4098 	view_vborder(view);
4099 
4100 	return NULL;
4101 }
4102 
4103 static const struct got_error *
4104 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
4105 {
4106 	const struct got_error *err = NULL;
4107 	struct tog_blame_cb_args *a = arg;
4108 	struct tog_blame_line *line;
4109 	int errcode;
4110 
4111 	if (nlines != a->nlines ||
4112 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
4113 		return got_error(GOT_ERR_RANGE);
4114 
4115 	errcode = pthread_mutex_lock(&tog_mutex);
4116 	if (errcode)
4117 		return got_error_set_errno(errcode, "pthread_mutex_lock");
4118 
4119 	if (*a->quit) {	/* user has quit the blame view */
4120 		err = got_error(GOT_ERR_ITER_COMPLETED);
4121 		goto done;
4122 	}
4123 
4124 	if (lineno == -1)
4125 		goto done; /* no change in this commit */
4126 
4127 	line = &a->lines[lineno - 1];
4128 	if (line->annotated)
4129 		goto done;
4130 
4131 	line->id = got_object_id_dup(id);
4132 	if (line->id == NULL) {
4133 		err = got_error_from_errno("got_object_id_dup");
4134 		goto done;
4135 	}
4136 	line->annotated = 1;
4137 done:
4138 	errcode = pthread_mutex_unlock(&tog_mutex);
4139 	if (errcode)
4140 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4141 	return err;
4142 }
4143 
4144 static void *
4145 blame_thread(void *arg)
4146 {
4147 	const struct got_error *err, *close_err;
4148 	struct tog_blame_thread_args *ta = arg;
4149 	struct tog_blame_cb_args *a = ta->cb_args;
4150 	int errcode;
4151 
4152 	err = block_signals_used_by_main_thread();
4153 	if (err)
4154 		return (void *)err;
4155 
4156 	err = got_blame(ta->path, a->commit_id, ta->repo,
4157 	    blame_cb, ta->cb_args, ta->cancel_cb, ta->cancel_arg);
4158 	if (err && err->code == GOT_ERR_CANCELLED)
4159 		err = NULL;
4160 
4161 	errcode = pthread_mutex_lock(&tog_mutex);
4162 	if (errcode)
4163 		return (void *)got_error_set_errno(errcode,
4164 		    "pthread_mutex_lock");
4165 
4166 	close_err = got_repo_close(ta->repo);
4167 	if (err == NULL)
4168 		err = close_err;
4169 	ta->repo = NULL;
4170 	*ta->complete = 1;
4171 
4172 	errcode = pthread_mutex_unlock(&tog_mutex);
4173 	if (errcode && err == NULL)
4174 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4175 
4176 	return (void *)err;
4177 }
4178 
4179 static struct got_object_id *
4180 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
4181     int first_displayed_line, int selected_line)
4182 {
4183 	struct tog_blame_line *line;
4184 
4185 	if (nlines <= 0)
4186 		return NULL;
4187 
4188 	line = &lines[first_displayed_line - 1 + selected_line - 1];
4189 	if (!line->annotated)
4190 		return NULL;
4191 
4192 	return line->id;
4193 }
4194 
4195 static const struct got_error *
4196 stop_blame(struct tog_blame *blame)
4197 {
4198 	const struct got_error *err = NULL;
4199 	int i;
4200 
4201 	if (blame->thread) {
4202 		int errcode;
4203 		errcode = pthread_mutex_unlock(&tog_mutex);
4204 		if (errcode)
4205 			return got_error_set_errno(errcode,
4206 			    "pthread_mutex_unlock");
4207 		errcode = pthread_join(blame->thread, (void **)&err);
4208 		if (errcode)
4209 			return got_error_set_errno(errcode, "pthread_join");
4210 		errcode = pthread_mutex_lock(&tog_mutex);
4211 		if (errcode)
4212 			return got_error_set_errno(errcode,
4213 			    "pthread_mutex_lock");
4214 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
4215 			err = NULL;
4216 		blame->thread = NULL;
4217 	}
4218 	if (blame->thread_args.repo) {
4219 		const struct got_error *close_err;
4220 		close_err = got_repo_close(blame->thread_args.repo);
4221 		if (err == NULL)
4222 			err = close_err;
4223 		blame->thread_args.repo = NULL;
4224 	}
4225 	if (blame->f) {
4226 		if (fclose(blame->f) == EOF && err == NULL)
4227 			err = got_error_from_errno("fclose");
4228 		blame->f = NULL;
4229 	}
4230 	if (blame->lines) {
4231 		for (i = 0; i < blame->nlines; i++)
4232 			free(blame->lines[i].id);
4233 		free(blame->lines);
4234 		blame->lines = NULL;
4235 	}
4236 	free(blame->cb_args.commit_id);
4237 	blame->cb_args.commit_id = NULL;
4238 
4239 	return err;
4240 }
4241 
4242 static const struct got_error *
4243 cancel_blame_view(void *arg)
4244 {
4245 	const struct got_error *err = NULL;
4246 	int *done = arg;
4247 	int errcode;
4248 
4249 	errcode = pthread_mutex_lock(&tog_mutex);
4250 	if (errcode)
4251 		return got_error_set_errno(errcode,
4252 		    "pthread_mutex_unlock");
4253 
4254 	if (*done)
4255 		err = got_error(GOT_ERR_CANCELLED);
4256 
4257 	errcode = pthread_mutex_unlock(&tog_mutex);
4258 	if (errcode)
4259 		return got_error_set_errno(errcode,
4260 		    "pthread_mutex_lock");
4261 
4262 	return err;
4263 }
4264 
4265 static const struct got_error *
4266 run_blame(struct tog_view *view)
4267 {
4268 	struct tog_blame_view_state *s = &view->state.blame;
4269 	struct tog_blame *blame = &s->blame;
4270 	const struct got_error *err = NULL;
4271 	struct got_blob_object *blob = NULL;
4272 	struct got_repository *thread_repo = NULL;
4273 	struct got_object_id *obj_id = NULL;
4274 	int obj_type;
4275 
4276 	err = got_object_id_by_path(&obj_id, s->repo, s->blamed_commit->id,
4277 	    s->path);
4278 	if (err)
4279 		return err;
4280 
4281 	err = got_object_get_type(&obj_type, s->repo, obj_id);
4282 	if (err)
4283 		goto done;
4284 
4285 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
4286 		err = got_error(GOT_ERR_OBJ_TYPE);
4287 		goto done;
4288 	}
4289 
4290 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192);
4291 	if (err)
4292 		goto done;
4293 	blame->f = got_opentemp();
4294 	if (blame->f == NULL) {
4295 		err = got_error_from_errno("got_opentemp");
4296 		goto done;
4297 	}
4298 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
4299 	    &blame->line_offsets, blame->f, blob);
4300 	if (err)
4301 		goto done;
4302 	if (blame->nlines == 0) {
4303 		s->blame_complete = 1;
4304 		goto done;
4305 	}
4306 
4307 	/* Don't include \n at EOF in the blame line count. */
4308 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
4309 		blame->nlines--;
4310 
4311 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
4312 	if (blame->lines == NULL) {
4313 		err = got_error_from_errno("calloc");
4314 		goto done;
4315 	}
4316 
4317 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL);
4318 	if (err)
4319 		goto done;
4320 
4321 	blame->cb_args.view = view;
4322 	blame->cb_args.lines = blame->lines;
4323 	blame->cb_args.nlines = blame->nlines;
4324 	blame->cb_args.commit_id = got_object_id_dup(s->blamed_commit->id);
4325 	if (blame->cb_args.commit_id == NULL) {
4326 		err = got_error_from_errno("got_object_id_dup");
4327 		goto done;
4328 	}
4329 	blame->cb_args.quit = &s->done;
4330 
4331 	blame->thread_args.path = s->path;
4332 	blame->thread_args.repo = thread_repo;
4333 	blame->thread_args.cb_args = &blame->cb_args;
4334 	blame->thread_args.complete = &s->blame_complete;
4335 	blame->thread_args.cancel_cb = cancel_blame_view;
4336 	blame->thread_args.cancel_arg = &s->done;
4337 	s->blame_complete = 0;
4338 
4339 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
4340 		s->first_displayed_line = 1;
4341 		s->last_displayed_line = view->nlines;
4342 		s->selected_line = 1;
4343 	}
4344 
4345 done:
4346 	if (blob)
4347 		got_object_blob_close(blob);
4348 	free(obj_id);
4349 	if (err)
4350 		stop_blame(blame);
4351 	return err;
4352 }
4353 
4354 static const struct got_error *
4355 open_blame_view(struct tog_view *view, char *path,
4356     struct got_object_id *commit_id, struct got_repository *repo)
4357 {
4358 	const struct got_error *err = NULL;
4359 	struct tog_blame_view_state *s = &view->state.blame;
4360 
4361 	STAILQ_INIT(&s->blamed_commits);
4362 
4363 	s->path = strdup(path);
4364 	if (s->path == NULL)
4365 		return got_error_from_errno("strdup");
4366 
4367 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
4368 	if (err) {
4369 		free(s->path);
4370 		return err;
4371 	}
4372 
4373 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
4374 	s->first_displayed_line = 1;
4375 	s->last_displayed_line = view->nlines;
4376 	s->selected_line = 1;
4377 	s->blame_complete = 0;
4378 	s->repo = repo;
4379 	s->commit_id = commit_id;
4380 	memset(&s->blame, 0, sizeof(s->blame));
4381 
4382 	STAILQ_INIT(&s->colors);
4383 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4384 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
4385 		    get_color_value("TOG_COLOR_COMMIT"));
4386 		if (err)
4387 			return err;
4388 	}
4389 
4390 	view->show = show_blame_view;
4391 	view->input = input_blame_view;
4392 	view->close = close_blame_view;
4393 	view->search_start = search_start_blame_view;
4394 	view->search_next = search_next_blame_view;
4395 
4396 	return run_blame(view);
4397 }
4398 
4399 static const struct got_error *
4400 close_blame_view(struct tog_view *view)
4401 {
4402 	const struct got_error *err = NULL;
4403 	struct tog_blame_view_state *s = &view->state.blame;
4404 
4405 	if (s->blame.thread)
4406 		err = stop_blame(&s->blame);
4407 
4408 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
4409 		struct got_object_qid *blamed_commit;
4410 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
4411 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
4412 		got_object_qid_free(blamed_commit);
4413 	}
4414 
4415 	free(s->path);
4416 	free_colors(&s->colors);
4417 
4418 	return err;
4419 }
4420 
4421 static const struct got_error *
4422 search_start_blame_view(struct tog_view *view)
4423 {
4424 	struct tog_blame_view_state *s = &view->state.blame;
4425 
4426 	s->matched_line = 0;
4427 	return NULL;
4428 }
4429 
4430 static const struct got_error *
4431 search_next_blame_view(struct tog_view *view)
4432 {
4433 	struct tog_blame_view_state *s = &view->state.blame;
4434 	int lineno;
4435 	char *line = NULL;
4436 	size_t linesize = 0;
4437 	ssize_t linelen;
4438 
4439 	if (!view->searching) {
4440 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4441 		return NULL;
4442 	}
4443 
4444 	if (s->matched_line) {
4445 		if (view->searching == TOG_SEARCH_FORWARD)
4446 			lineno = s->matched_line + 1;
4447 		else
4448 			lineno = s->matched_line - 1;
4449 	} else {
4450 		if (view->searching == TOG_SEARCH_FORWARD)
4451 			lineno = 1;
4452 		else
4453 			lineno = s->blame.nlines;
4454 	}
4455 
4456 	while (1) {
4457 		off_t offset;
4458 
4459 		if (lineno <= 0 || lineno > s->blame.nlines) {
4460 			if (s->matched_line == 0) {
4461 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4462 				break;
4463 			}
4464 
4465 			if (view->searching == TOG_SEARCH_FORWARD)
4466 				lineno = 1;
4467 			else
4468 				lineno = s->blame.nlines;
4469 		}
4470 
4471 		offset = s->blame.line_offsets[lineno - 1];
4472 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
4473 			free(line);
4474 			return got_error_from_errno("fseeko");
4475 		}
4476 		linelen = getline(&line, &linesize, s->blame.f);
4477 		if (linelen != -1 &&
4478 		    match_line(line, &view->regex, 1, &view->regmatch)) {
4479 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
4480 			s->matched_line = lineno;
4481 			break;
4482 		}
4483 		if (view->searching == TOG_SEARCH_FORWARD)
4484 			lineno++;
4485 		else
4486 			lineno--;
4487 	}
4488 	free(line);
4489 
4490 	if (s->matched_line) {
4491 		s->first_displayed_line = s->matched_line;
4492 		s->selected_line = 1;
4493 	}
4494 
4495 	return NULL;
4496 }
4497 
4498 static const struct got_error *
4499 show_blame_view(struct tog_view *view)
4500 {
4501 	const struct got_error *err = NULL;
4502 	struct tog_blame_view_state *s = &view->state.blame;
4503 	int errcode;
4504 
4505 	if (s->blame.thread == NULL && !s->blame_complete) {
4506 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
4507 		    &s->blame.thread_args);
4508 		if (errcode)
4509 			return got_error_set_errno(errcode, "pthread_create");
4510 
4511 		halfdelay(1); /* fast refresh while annotating  */
4512 	}
4513 
4514 	if (s->blame_complete)
4515 		halfdelay(10); /* disable fast refresh */
4516 
4517 	err = draw_blame(view);
4518 
4519 	view_vborder(view);
4520 	return err;
4521 }
4522 
4523 static const struct got_error *
4524 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
4525 {
4526 	const struct got_error *err = NULL, *thread_err = NULL;
4527 	struct tog_view *diff_view;
4528 	struct tog_blame_view_state *s = &view->state.blame;
4529 	int begin_x = 0;
4530 
4531 	switch (ch) {
4532 	case 'q':
4533 		s->done = 1;
4534 		break;
4535 	case 'k':
4536 	case KEY_UP:
4537 		if (s->selected_line > 1)
4538 			s->selected_line--;
4539 		else if (s->selected_line == 1 &&
4540 		    s->first_displayed_line > 1)
4541 			s->first_displayed_line--;
4542 		break;
4543 	case KEY_PPAGE:
4544 	case CTRL('b'):
4545 		if (s->first_displayed_line == 1) {
4546 			s->selected_line = 1;
4547 			break;
4548 		}
4549 		if (s->first_displayed_line > view->nlines - 2)
4550 			s->first_displayed_line -=
4551 			    (view->nlines - 2);
4552 		else
4553 			s->first_displayed_line = 1;
4554 		break;
4555 	case 'j':
4556 	case KEY_DOWN:
4557 		if (s->selected_line < view->nlines - 2 &&
4558 		    s->first_displayed_line +
4559 		    s->selected_line <= s->blame.nlines)
4560 			s->selected_line++;
4561 		else if (s->last_displayed_line <
4562 		    s->blame.nlines)
4563 			s->first_displayed_line++;
4564 		break;
4565 	case 'b':
4566 	case 'p': {
4567 		struct got_object_id *id = NULL;
4568 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
4569 		    s->first_displayed_line, s->selected_line);
4570 		if (id == NULL)
4571 			break;
4572 		if (ch == 'p') {
4573 			struct got_commit_object *commit;
4574 			struct got_object_qid *pid;
4575 			struct got_object_id *blob_id = NULL;
4576 			int obj_type;
4577 			err = got_object_open_as_commit(&commit,
4578 			    s->repo, id);
4579 			if (err)
4580 				break;
4581 			pid = STAILQ_FIRST(
4582 			    got_object_commit_get_parent_ids(commit));
4583 			if (pid == NULL) {
4584 				got_object_commit_close(commit);
4585 				break;
4586 			}
4587 			/* Check if path history ends here. */
4588 			err = got_object_id_by_path(&blob_id, s->repo,
4589 			    pid->id, s->path);
4590 			if (err) {
4591 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
4592 					err = NULL;
4593 				got_object_commit_close(commit);
4594 				break;
4595 			}
4596 			err = got_object_get_type(&obj_type, s->repo,
4597 			    blob_id);
4598 			free(blob_id);
4599 			/* Can't blame non-blob type objects. */
4600 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
4601 				got_object_commit_close(commit);
4602 				break;
4603 			}
4604 			err = got_object_qid_alloc(&s->blamed_commit,
4605 			    pid->id);
4606 			got_object_commit_close(commit);
4607 		} else {
4608 			if (got_object_id_cmp(id,
4609 			    s->blamed_commit->id) == 0)
4610 				break;
4611 			err = got_object_qid_alloc(&s->blamed_commit,
4612 			    id);
4613 		}
4614 		if (err)
4615 			break;
4616 		s->done = 1;
4617 		thread_err = stop_blame(&s->blame);
4618 		s->done = 0;
4619 		if (thread_err)
4620 			break;
4621 		STAILQ_INSERT_HEAD(&s->blamed_commits,
4622 		    s->blamed_commit, entry);
4623 		err = run_blame(view);
4624 		if (err)
4625 			break;
4626 		break;
4627 	}
4628 	case 'B': {
4629 		struct got_object_qid *first;
4630 		first = STAILQ_FIRST(&s->blamed_commits);
4631 		if (!got_object_id_cmp(first->id, s->commit_id))
4632 			break;
4633 		s->done = 1;
4634 		thread_err = stop_blame(&s->blame);
4635 		s->done = 0;
4636 		if (thread_err)
4637 			break;
4638 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
4639 		got_object_qid_free(s->blamed_commit);
4640 		s->blamed_commit =
4641 		    STAILQ_FIRST(&s->blamed_commits);
4642 		err = run_blame(view);
4643 		if (err)
4644 			break;
4645 		break;
4646 	}
4647 	case KEY_ENTER:
4648 	case '\r': {
4649 		struct got_object_id *id = NULL;
4650 		struct got_object_qid *pid;
4651 		struct got_commit_object *commit = NULL;
4652 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
4653 		    s->first_displayed_line, s->selected_line);
4654 		if (id == NULL)
4655 			break;
4656 		err = got_object_open_as_commit(&commit, s->repo, id);
4657 		if (err)
4658 			break;
4659 		pid = STAILQ_FIRST(
4660 		    got_object_commit_get_parent_ids(commit));
4661 		if (view_is_parent_view(view))
4662 		    begin_x = view_split_begin_x(view->begin_x);
4663 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
4664 		if (diff_view == NULL) {
4665 			got_object_commit_close(commit);
4666 			err = got_error_from_errno("view_open");
4667 			break;
4668 		}
4669 		err = open_diff_view(diff_view, pid ? pid->id : NULL,
4670 		    id, NULL, NULL, 3, 0, 0, NULL, s->repo);
4671 		got_object_commit_close(commit);
4672 		if (err) {
4673 			view_close(diff_view);
4674 			break;
4675 		}
4676 		view->focussed = 0;
4677 		diff_view->focussed = 1;
4678 		if (view_is_parent_view(view)) {
4679 			err = view_close_child(view);
4680 			if (err)
4681 				break;
4682 			view_set_child(view, diff_view);
4683 			view->focus_child = 1;
4684 		} else
4685 			*new_view = diff_view;
4686 		if (err)
4687 			break;
4688 		break;
4689 	}
4690 	case KEY_NPAGE:
4691 	case CTRL('f'):
4692 	case ' ':
4693 		if (s->last_displayed_line >= s->blame.nlines &&
4694 		    s->selected_line >= MIN(s->blame.nlines,
4695 		    view->nlines - 2)) {
4696 			break;
4697 		}
4698 		if (s->last_displayed_line >= s->blame.nlines &&
4699 		    s->selected_line < view->nlines - 2) {
4700 			s->selected_line = MIN(s->blame.nlines,
4701 			    view->nlines - 2);
4702 			break;
4703 		}
4704 		if (s->last_displayed_line + view->nlines - 2
4705 		    <= s->blame.nlines)
4706 			s->first_displayed_line +=
4707 			    view->nlines - 2;
4708 		else
4709 			s->first_displayed_line =
4710 			    s->blame.nlines -
4711 			    (view->nlines - 3);
4712 		break;
4713 	case KEY_RESIZE:
4714 		if (s->selected_line > view->nlines - 2) {
4715 			s->selected_line = MIN(s->blame.nlines,
4716 			    view->nlines - 2);
4717 		}
4718 		break;
4719 	default:
4720 		break;
4721 	}
4722 	return thread_err ? thread_err : err;
4723 }
4724 
4725 static const struct got_error *
4726 cmd_blame(int argc, char *argv[])
4727 {
4728 	const struct got_error *error;
4729 	struct got_repository *repo = NULL;
4730 	struct got_worktree *worktree = NULL;
4731 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
4732 	char *link_target = NULL;
4733 	struct got_object_id *commit_id = NULL;
4734 	char *commit_id_str = NULL;
4735 	int ch;
4736 	struct tog_view *view;
4737 
4738 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
4739 		switch (ch) {
4740 		case 'c':
4741 			commit_id_str = optarg;
4742 			break;
4743 		case 'r':
4744 			repo_path = realpath(optarg, NULL);
4745 			if (repo_path == NULL)
4746 				return got_error_from_errno2("realpath",
4747 				    optarg);
4748 			break;
4749 		default:
4750 			usage_blame();
4751 			/* NOTREACHED */
4752 		}
4753 	}
4754 
4755 	argc -= optind;
4756 	argv += optind;
4757 
4758 	if (argc != 1)
4759 		usage_blame();
4760 
4761 	if (repo_path == NULL) {
4762 		cwd = getcwd(NULL, 0);
4763 		if (cwd == NULL)
4764 			return got_error_from_errno("getcwd");
4765 		error = got_worktree_open(&worktree, cwd);
4766 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4767 			goto done;
4768 		if (worktree)
4769 			repo_path =
4770 			    strdup(got_worktree_get_repo_path(worktree));
4771 		else
4772 			repo_path = strdup(cwd);
4773 		if (repo_path == NULL) {
4774 			error = got_error_from_errno("strdup");
4775 			goto done;
4776 		}
4777 	}
4778 
4779 	error = got_repo_open(&repo, repo_path, NULL);
4780 	if (error != NULL)
4781 		goto done;
4782 
4783 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
4784 	    worktree);
4785 	if (error)
4786 		goto done;
4787 
4788 	init_curses();
4789 
4790 	error = apply_unveil(got_repo_get_path(repo), NULL);
4791 	if (error)
4792 		goto done;
4793 
4794 	error = tog_load_refs(repo);
4795 	if (error)
4796 		goto done;
4797 
4798 	if (commit_id_str == NULL) {
4799 		struct got_reference *head_ref;
4800 		error = got_ref_open(&head_ref, repo, worktree ?
4801 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
4802 		if (error != NULL)
4803 			goto done;
4804 		error = got_ref_resolve(&commit_id, repo, head_ref);
4805 		got_ref_close(head_ref);
4806 	} else {
4807 		error = got_repo_match_object_id(&commit_id, NULL,
4808 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4809 	}
4810 	if (error != NULL)
4811 		goto done;
4812 
4813 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
4814 	if (view == NULL) {
4815 		error = got_error_from_errno("view_open");
4816 		goto done;
4817 	}
4818 
4819 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
4820 	    commit_id, repo);
4821 	if (error)
4822 		goto done;
4823 
4824 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
4825 	    commit_id, repo);
4826 	if (error)
4827 		goto done;
4828 	if (worktree) {
4829 		/* Release work tree lock. */
4830 		got_worktree_close(worktree);
4831 		worktree = NULL;
4832 	}
4833 	error = view_loop(view);
4834 done:
4835 	free(repo_path);
4836 	free(in_repo_path);
4837 	free(link_target);
4838 	free(cwd);
4839 	free(commit_id);
4840 	if (worktree)
4841 		got_worktree_close(worktree);
4842 	if (repo) {
4843 		const struct got_error *close_err = got_repo_close(repo);
4844 		if (error == NULL)
4845 			error = close_err;
4846 	}
4847 	tog_free_refs();
4848 	return error;
4849 }
4850 
4851 static const struct got_error *
4852 draw_tree_entries(struct tog_view *view, const char *parent_path)
4853 {
4854 	struct tog_tree_view_state *s = &view->state.tree;
4855 	const struct got_error *err = NULL;
4856 	struct got_tree_entry *te;
4857 	wchar_t *wline;
4858 	struct tog_color *tc;
4859 	int width, n, i, nentries;
4860 	int limit = view->nlines;
4861 
4862 	s->ndisplayed = 0;
4863 
4864 	werase(view->window);
4865 
4866 	if (limit == 0)
4867 		return NULL;
4868 
4869 	err = format_line(&wline, &width, s->tree_label, view->ncols, 0);
4870 	if (err)
4871 		return err;
4872 	if (view_needs_focus_indication(view))
4873 		wstandout(view->window);
4874 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4875 	if (tc)
4876 		wattr_on(view->window,
4877 		    COLOR_PAIR(tc->colorpair), NULL);
4878 	waddwstr(view->window, wline);
4879 	if (tc)
4880 		wattr_off(view->window,
4881 		    COLOR_PAIR(tc->colorpair), NULL);
4882 	if (view_needs_focus_indication(view))
4883 		wstandend(view->window);
4884 	free(wline);
4885 	wline = NULL;
4886 	if (width < view->ncols - 1)
4887 		waddch(view->window, '\n');
4888 	if (--limit <= 0)
4889 		return NULL;
4890 	err = format_line(&wline, &width, parent_path, view->ncols, 0);
4891 	if (err)
4892 		return err;
4893 	waddwstr(view->window, wline);
4894 	free(wline);
4895 	wline = NULL;
4896 	if (width < view->ncols - 1)
4897 		waddch(view->window, '\n');
4898 	if (--limit <= 0)
4899 		return NULL;
4900 	waddch(view->window, '\n');
4901 	if (--limit <= 0)
4902 		return NULL;
4903 
4904 	if (s->first_displayed_entry == NULL) {
4905 		te = got_object_tree_get_first_entry(s->tree);
4906 		if (s->selected == 0) {
4907 			if (view->focussed)
4908 				wstandout(view->window);
4909 			s->selected_entry = NULL;
4910 		}
4911 		waddstr(view->window, "  ..\n");	/* parent directory */
4912 		if (s->selected == 0 && view->focussed)
4913 			wstandend(view->window);
4914 		s->ndisplayed++;
4915 		if (--limit <= 0)
4916 			return NULL;
4917 		n = 1;
4918 	} else {
4919 		n = 0;
4920 		te = s->first_displayed_entry;
4921 	}
4922 
4923 	nentries = got_object_tree_get_nentries(s->tree);
4924 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
4925 		char *line = NULL, *id_str = NULL, *link_target = NULL;
4926 		const char *modestr = "";
4927 		mode_t mode;
4928 
4929 		te = got_object_tree_get_entry(s->tree, i);
4930 		mode = got_tree_entry_get_mode(te);
4931 
4932 		if (s->show_ids) {
4933 			err = got_object_id_str(&id_str,
4934 			    got_tree_entry_get_id(te));
4935 			if (err)
4936 				return got_error_from_errno(
4937 				    "got_object_id_str");
4938 		}
4939 		if (got_object_tree_entry_is_submodule(te))
4940 			modestr = "$";
4941 		else if (S_ISLNK(mode)) {
4942 			int i;
4943 
4944 			err = got_tree_entry_get_symlink_target(&link_target,
4945 			    te, s->repo);
4946 			if (err) {
4947 				free(id_str);
4948 				return err;
4949 			}
4950 			for (i = 0; i < strlen(link_target); i++) {
4951 				if (!isprint((unsigned char)link_target[i]))
4952 					link_target[i] = '?';
4953 			}
4954 			modestr = "@";
4955 		}
4956 		else if (S_ISDIR(mode))
4957 			modestr = "/";
4958 		else if (mode & S_IXUSR)
4959 			modestr = "*";
4960 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
4961 		    got_tree_entry_get_name(te), modestr,
4962 		    link_target ? " -> ": "",
4963 		    link_target ? link_target : "") == -1) {
4964 			free(id_str);
4965 			free(link_target);
4966 			return got_error_from_errno("asprintf");
4967 		}
4968 		free(id_str);
4969 		free(link_target);
4970 		err = format_line(&wline, &width, line, view->ncols, 0);
4971 		if (err) {
4972 			free(line);
4973 			break;
4974 		}
4975 		if (n == s->selected) {
4976 			if (view->focussed)
4977 				wstandout(view->window);
4978 			s->selected_entry = te;
4979 		}
4980 		tc = match_color(&s->colors, line);
4981 		if (tc)
4982 			wattr_on(view->window,
4983 			    COLOR_PAIR(tc->colorpair), NULL);
4984 		waddwstr(view->window, wline);
4985 		if (tc)
4986 			wattr_off(view->window,
4987 			    COLOR_PAIR(tc->colorpair), NULL);
4988 		if (width < view->ncols - 1)
4989 			waddch(view->window, '\n');
4990 		if (n == s->selected && view->focussed)
4991 			wstandend(view->window);
4992 		free(line);
4993 		free(wline);
4994 		wline = NULL;
4995 		n++;
4996 		s->ndisplayed++;
4997 		s->last_displayed_entry = te;
4998 		if (--limit <= 0)
4999 			break;
5000 	}
5001 
5002 	return err;
5003 }
5004 
5005 static void
5006 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
5007 {
5008 	struct got_tree_entry *te;
5009 	int isroot = s->tree == s->root;
5010 	int i = 0;
5011 
5012 	if (s->first_displayed_entry == NULL)
5013 		return;
5014 
5015 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
5016 	while (i++ < maxscroll) {
5017 		if (te == NULL) {
5018 			if (!isroot)
5019 				s->first_displayed_entry = NULL;
5020 			break;
5021 		}
5022 		s->first_displayed_entry = te;
5023 		te = got_tree_entry_get_prev(s->tree, te);
5024 	}
5025 }
5026 
5027 static void
5028 tree_scroll_down(struct tog_tree_view_state *s, int maxscroll)
5029 {
5030 	struct got_tree_entry *next, *last;
5031 	int n = 0;
5032 
5033 	if (s->first_displayed_entry)
5034 		next = got_tree_entry_get_next(s->tree,
5035 		    s->first_displayed_entry);
5036 	else
5037 		next = got_object_tree_get_first_entry(s->tree);
5038 
5039 	last = s->last_displayed_entry;
5040 	while (next && last && n++ < maxscroll) {
5041 		last = got_tree_entry_get_next(s->tree, last);
5042 		if (last) {
5043 			s->first_displayed_entry = next;
5044 			next = got_tree_entry_get_next(s->tree, next);
5045 		}
5046 	}
5047 }
5048 
5049 static const struct got_error *
5050 tree_entry_path(char **path, struct tog_parent_trees *parents,
5051     struct got_tree_entry *te)
5052 {
5053 	const struct got_error *err = NULL;
5054 	struct tog_parent_tree *pt;
5055 	size_t len = 2; /* for leading slash and NUL */
5056 
5057 	TAILQ_FOREACH(pt, parents, entry)
5058 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
5059 		    + 1 /* slash */;
5060 	if (te)
5061 		len += strlen(got_tree_entry_get_name(te));
5062 
5063 	*path = calloc(1, len);
5064 	if (path == NULL)
5065 		return got_error_from_errno("calloc");
5066 
5067 	(*path)[0] = '/';
5068 	pt = TAILQ_LAST(parents, tog_parent_trees);
5069 	while (pt) {
5070 		const char *name = got_tree_entry_get_name(pt->selected_entry);
5071 		if (strlcat(*path, name, len) >= len) {
5072 			err = got_error(GOT_ERR_NO_SPACE);
5073 			goto done;
5074 		}
5075 		if (strlcat(*path, "/", len) >= len) {
5076 			err = got_error(GOT_ERR_NO_SPACE);
5077 			goto done;
5078 		}
5079 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
5080 	}
5081 	if (te) {
5082 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
5083 			err = got_error(GOT_ERR_NO_SPACE);
5084 			goto done;
5085 		}
5086 	}
5087 done:
5088 	if (err) {
5089 		free(*path);
5090 		*path = NULL;
5091 	}
5092 	return err;
5093 }
5094 
5095 static const struct got_error *
5096 blame_tree_entry(struct tog_view **new_view, int begin_x,
5097     struct got_tree_entry *te, struct tog_parent_trees *parents,
5098     struct got_object_id *commit_id, struct got_repository *repo)
5099 {
5100 	const struct got_error *err = NULL;
5101 	char *path;
5102 	struct tog_view *blame_view;
5103 
5104 	*new_view = NULL;
5105 
5106 	err = tree_entry_path(&path, parents, te);
5107 	if (err)
5108 		return err;
5109 
5110 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
5111 	if (blame_view == NULL) {
5112 		err = got_error_from_errno("view_open");
5113 		goto done;
5114 	}
5115 
5116 	err = open_blame_view(blame_view, path, commit_id, repo);
5117 	if (err) {
5118 		if (err->code == GOT_ERR_CANCELLED)
5119 			err = NULL;
5120 		view_close(blame_view);
5121 	} else
5122 		*new_view = blame_view;
5123 done:
5124 	free(path);
5125 	return err;
5126 }
5127 
5128 static const struct got_error *
5129 log_selected_tree_entry(struct tog_view **new_view, int begin_x,
5130     struct tog_tree_view_state *s)
5131 {
5132 	struct tog_view *log_view;
5133 	const struct got_error *err = NULL;
5134 	char *path;
5135 
5136 	*new_view = NULL;
5137 
5138 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
5139 	if (log_view == NULL)
5140 		return got_error_from_errno("view_open");
5141 
5142 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
5143 	if (err)
5144 		return err;
5145 
5146 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
5147 	    path, 0);
5148 	if (err)
5149 		view_close(log_view);
5150 	else
5151 		*new_view = log_view;
5152 	free(path);
5153 	return err;
5154 }
5155 
5156 static const struct got_error *
5157 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
5158     const char *head_ref_name, struct got_repository *repo)
5159 {
5160 	const struct got_error *err = NULL;
5161 	char *commit_id_str = NULL;
5162 	struct tog_tree_view_state *s = &view->state.tree;
5163 	struct got_commit_object *commit = NULL;
5164 
5165 	TAILQ_INIT(&s->parents);
5166 	STAILQ_INIT(&s->colors);
5167 
5168 	s->commit_id = got_object_id_dup(commit_id);
5169 	if (s->commit_id == NULL)
5170 		return got_error_from_errno("got_object_id_dup");
5171 
5172 	err = got_object_open_as_commit(&commit, repo, commit_id);
5173 	if (err)
5174 		goto done;
5175 
5176 	/*
5177 	 * The root is opened here and will be closed when the view is closed.
5178 	 * Any visited subtrees and their path-wise parents are opened and
5179 	 * closed on demand.
5180 	 */
5181 	err = got_object_open_as_tree(&s->root, repo,
5182 	    got_object_commit_get_tree_id(commit));
5183 	if (err)
5184 		goto done;
5185 	s->tree = s->root;
5186 
5187 	err = got_object_id_str(&commit_id_str, commit_id);
5188 	if (err != NULL)
5189 		goto done;
5190 
5191 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
5192 		err = got_error_from_errno("asprintf");
5193 		goto done;
5194 	}
5195 
5196 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
5197 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
5198 	if (head_ref_name) {
5199 		s->head_ref_name = strdup(head_ref_name);
5200 		if (s->head_ref_name == NULL) {
5201 			err = got_error_from_errno("strdup");
5202 			goto done;
5203 		}
5204 	}
5205 	s->repo = repo;
5206 
5207 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5208 		err = add_color(&s->colors, "\\$$",
5209 		    TOG_COLOR_TREE_SUBMODULE,
5210 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
5211 		if (err)
5212 			goto done;
5213 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
5214 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
5215 		if (err)
5216 			goto done;
5217 		err = add_color(&s->colors, "/$",
5218 		    TOG_COLOR_TREE_DIRECTORY,
5219 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
5220 		if (err)
5221 			goto done;
5222 
5223 		err = add_color(&s->colors, "\\*$",
5224 		    TOG_COLOR_TREE_EXECUTABLE,
5225 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
5226 		if (err)
5227 			goto done;
5228 
5229 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
5230 		    get_color_value("TOG_COLOR_COMMIT"));
5231 		if (err)
5232 			goto done;
5233 	}
5234 
5235 	view->show = show_tree_view;
5236 	view->input = input_tree_view;
5237 	view->close = close_tree_view;
5238 	view->search_start = search_start_tree_view;
5239 	view->search_next = search_next_tree_view;
5240 done:
5241 	free(commit_id_str);
5242 	if (commit)
5243 		got_object_commit_close(commit);
5244 	if (err)
5245 		close_tree_view(view);
5246 	return err;
5247 }
5248 
5249 static const struct got_error *
5250 close_tree_view(struct tog_view *view)
5251 {
5252 	struct tog_tree_view_state *s = &view->state.tree;
5253 
5254 	free_colors(&s->colors);
5255 	free(s->tree_label);
5256 	s->tree_label = NULL;
5257 	free(s->commit_id);
5258 	s->commit_id = NULL;
5259 	free(s->head_ref_name);
5260 	s->head_ref_name = NULL;
5261 	while (!TAILQ_EMPTY(&s->parents)) {
5262 		struct tog_parent_tree *parent;
5263 		parent = TAILQ_FIRST(&s->parents);
5264 		TAILQ_REMOVE(&s->parents, parent, entry);
5265 		if (parent->tree != s->root)
5266 			got_object_tree_close(parent->tree);
5267 		free(parent);
5268 
5269 	}
5270 	if (s->tree != NULL && s->tree != s->root)
5271 		got_object_tree_close(s->tree);
5272 	if (s->root)
5273 		got_object_tree_close(s->root);
5274 	return NULL;
5275 }
5276 
5277 static const struct got_error *
5278 search_start_tree_view(struct tog_view *view)
5279 {
5280 	struct tog_tree_view_state *s = &view->state.tree;
5281 
5282 	s->matched_entry = NULL;
5283 	return NULL;
5284 }
5285 
5286 static int
5287 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
5288 {
5289 	regmatch_t regmatch;
5290 
5291 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
5292 	    0) == 0;
5293 }
5294 
5295 static const struct got_error *
5296 search_next_tree_view(struct tog_view *view)
5297 {
5298 	struct tog_tree_view_state *s = &view->state.tree;
5299 	struct got_tree_entry *te = NULL;
5300 
5301 	if (!view->searching) {
5302 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5303 		return NULL;
5304 	}
5305 
5306 	if (s->matched_entry) {
5307 		if (view->searching == TOG_SEARCH_FORWARD) {
5308 			if (s->selected_entry)
5309 				te = got_tree_entry_get_next(s->tree,
5310 				    s->selected_entry);
5311 			else
5312 				te = got_object_tree_get_first_entry(s->tree);
5313 		} else {
5314 			if (s->selected_entry == NULL)
5315 				te = got_object_tree_get_last_entry(s->tree);
5316 			else
5317 				te = got_tree_entry_get_prev(s->tree,
5318 				    s->selected_entry);
5319 		}
5320 	} else {
5321 		if (view->searching == TOG_SEARCH_FORWARD)
5322 			te = got_object_tree_get_first_entry(s->tree);
5323 		else
5324 			te = got_object_tree_get_last_entry(s->tree);
5325 	}
5326 
5327 	while (1) {
5328 		if (te == NULL) {
5329 			if (s->matched_entry == NULL) {
5330 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5331 				return NULL;
5332 			}
5333 			if (view->searching == TOG_SEARCH_FORWARD)
5334 				te = got_object_tree_get_first_entry(s->tree);
5335 			else
5336 				te = got_object_tree_get_last_entry(s->tree);
5337 		}
5338 
5339 		if (match_tree_entry(te, &view->regex)) {
5340 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
5341 			s->matched_entry = te;
5342 			break;
5343 		}
5344 
5345 		if (view->searching == TOG_SEARCH_FORWARD)
5346 			te = got_tree_entry_get_next(s->tree, te);
5347 		else
5348 			te = got_tree_entry_get_prev(s->tree, te);
5349 	}
5350 
5351 	if (s->matched_entry) {
5352 		s->first_displayed_entry = s->matched_entry;
5353 		s->selected = 0;
5354 	}
5355 
5356 	return NULL;
5357 }
5358 
5359 static const struct got_error *
5360 show_tree_view(struct tog_view *view)
5361 {
5362 	const struct got_error *err = NULL;
5363 	struct tog_tree_view_state *s = &view->state.tree;
5364 	char *parent_path;
5365 
5366 	err = tree_entry_path(&parent_path, &s->parents, NULL);
5367 	if (err)
5368 		return err;
5369 
5370 	err = draw_tree_entries(view, parent_path);
5371 	free(parent_path);
5372 
5373 	view_vborder(view);
5374 	return err;
5375 }
5376 
5377 static const struct got_error *
5378 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
5379 {
5380 	const struct got_error *err = NULL;
5381 	struct tog_tree_view_state *s = &view->state.tree;
5382 	struct tog_view *log_view, *ref_view;
5383 	int begin_x = 0;
5384 
5385 	switch (ch) {
5386 	case 'i':
5387 		s->show_ids = !s->show_ids;
5388 		break;
5389 	case 'l':
5390 		if (!s->selected_entry)
5391 			break;
5392 		if (view_is_parent_view(view))
5393 			begin_x = view_split_begin_x(view->begin_x);
5394 		err = log_selected_tree_entry(&log_view, begin_x, s);
5395 		view->focussed = 0;
5396 		log_view->focussed = 1;
5397 		if (view_is_parent_view(view)) {
5398 			err = view_close_child(view);
5399 			if (err)
5400 				return err;
5401 			view_set_child(view, log_view);
5402 			view->focus_child = 1;
5403 		} else
5404 			*new_view = log_view;
5405 		break;
5406 	case 'r':
5407 		if (view_is_parent_view(view))
5408 			begin_x = view_split_begin_x(view->begin_x);
5409 		ref_view = view_open(view->nlines, view->ncols,
5410 		    view->begin_y, begin_x, TOG_VIEW_REF);
5411 		if (ref_view == NULL)
5412 			return got_error_from_errno("view_open");
5413 		err = open_ref_view(ref_view, s->repo);
5414 		if (err) {
5415 			view_close(ref_view);
5416 			return err;
5417 		}
5418 		view->focussed = 0;
5419 		ref_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, ref_view);
5425 			view->focus_child = 1;
5426 		} else
5427 			*new_view = ref_view;
5428 		break;
5429 	case 'k':
5430 	case KEY_UP:
5431 		if (s->selected > 0) {
5432 			s->selected--;
5433 			break;
5434 		}
5435 		tree_scroll_up(s, 1);
5436 		break;
5437 	case KEY_PPAGE:
5438 	case CTRL('b'):
5439 		if (s->tree == s->root) {
5440 			if (got_object_tree_get_first_entry(s->tree) ==
5441 			    s->first_displayed_entry)
5442 				s->selected = 0;
5443 		} else {
5444 			if (s->first_displayed_entry == NULL)
5445 				s->selected = 0;
5446 		}
5447 		tree_scroll_up(s, MAX(0, view->nlines - 3));
5448 		break;
5449 	case 'j':
5450 	case KEY_DOWN:
5451 		if (s->selected < s->ndisplayed - 1) {
5452 			s->selected++;
5453 			break;
5454 		}
5455 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
5456 		    == NULL)
5457 			/* can't scroll any further */
5458 			break;
5459 		tree_scroll_down(s, 1);
5460 		break;
5461 	case KEY_NPAGE:
5462 	case CTRL('f'):
5463 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
5464 		    == NULL) {
5465 			/* can't scroll any further; move cursor down */
5466 			if (s->selected < s->ndisplayed - 1)
5467 				s->selected = s->ndisplayed - 1;
5468 			break;
5469 		}
5470 		tree_scroll_down(s, view->nlines - 3);
5471 		break;
5472 	case KEY_ENTER:
5473 	case '\r':
5474 	case KEY_BACKSPACE:
5475 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
5476 			struct tog_parent_tree *parent;
5477 			/* user selected '..' */
5478 			if (s->tree == s->root)
5479 				break;
5480 			parent = TAILQ_FIRST(&s->parents);
5481 			TAILQ_REMOVE(&s->parents, parent,
5482 			    entry);
5483 			got_object_tree_close(s->tree);
5484 			s->tree = parent->tree;
5485 			s->first_displayed_entry =
5486 			    parent->first_displayed_entry;
5487 			s->selected_entry =
5488 			    parent->selected_entry;
5489 			s->selected = parent->selected;
5490 			free(parent);
5491 		} else if (S_ISDIR(got_tree_entry_get_mode(
5492 		    s->selected_entry))) {
5493 			struct got_tree_object *subtree;
5494 			err = got_object_open_as_tree(&subtree, s->repo,
5495 			    got_tree_entry_get_id(s->selected_entry));
5496 			if (err)
5497 				break;
5498 			err = tree_view_visit_subtree(s, subtree);
5499 			if (err) {
5500 				got_object_tree_close(subtree);
5501 				break;
5502 			}
5503 		} else if (S_ISREG(got_tree_entry_get_mode(
5504 		    s->selected_entry))) {
5505 			struct tog_view *blame_view;
5506 			int begin_x = view_is_parent_view(view) ?
5507 			    view_split_begin_x(view->begin_x) : 0;
5508 
5509 			err = blame_tree_entry(&blame_view, begin_x,
5510 			    s->selected_entry, &s->parents,
5511 			    s->commit_id, s->repo);
5512 			if (err)
5513 				break;
5514 			view->focussed = 0;
5515 			blame_view->focussed = 1;
5516 			if (view_is_parent_view(view)) {
5517 				err = view_close_child(view);
5518 				if (err)
5519 					return err;
5520 				view_set_child(view, blame_view);
5521 				view->focus_child = 1;
5522 			} else
5523 				*new_view = blame_view;
5524 		}
5525 		break;
5526 	case KEY_RESIZE:
5527 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
5528 			s->selected = view->nlines - 4;
5529 		break;
5530 	default:
5531 		break;
5532 	}
5533 
5534 	return err;
5535 }
5536 
5537 __dead static void
5538 usage_tree(void)
5539 {
5540 	endwin();
5541 	fprintf(stderr, "usage: %s tree [-c commit] [-r repository-path] [path]\n",
5542 	    getprogname());
5543 	exit(1);
5544 }
5545 
5546 static const struct got_error *
5547 cmd_tree(int argc, char *argv[])
5548 {
5549 	const struct got_error *error;
5550 	struct got_repository *repo = NULL;
5551 	struct got_worktree *worktree = NULL;
5552 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
5553 	struct got_object_id *commit_id = NULL;
5554 	const char *commit_id_arg = NULL;
5555 	char *label = NULL;
5556 	struct got_reference *ref = NULL;
5557 	const char *head_ref_name = NULL;
5558 	int ch;
5559 	struct tog_view *view;
5560 
5561 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
5562 		switch (ch) {
5563 		case 'c':
5564 			commit_id_arg = optarg;
5565 			break;
5566 		case 'r':
5567 			repo_path = realpath(optarg, NULL);
5568 			if (repo_path == NULL)
5569 				return got_error_from_errno2("realpath",
5570 				    optarg);
5571 			break;
5572 		default:
5573 			usage_tree();
5574 			/* NOTREACHED */
5575 		}
5576 	}
5577 
5578 	argc -= optind;
5579 	argv += optind;
5580 
5581 	if (argc > 1)
5582 		usage_tree();
5583 
5584 	if (repo_path == NULL) {
5585 		cwd = getcwd(NULL, 0);
5586 		if (cwd == NULL)
5587 			return got_error_from_errno("getcwd");
5588 		error = got_worktree_open(&worktree, cwd);
5589 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5590 			goto done;
5591 		if (worktree)
5592 			repo_path =
5593 			    strdup(got_worktree_get_repo_path(worktree));
5594 		else
5595 			repo_path = strdup(cwd);
5596 		if (repo_path == NULL) {
5597 			error = got_error_from_errno("strdup");
5598 			goto done;
5599 		}
5600 	}
5601 
5602 	error = got_repo_open(&repo, repo_path, NULL);
5603 	if (error != NULL)
5604 		goto done;
5605 
5606 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
5607 	    repo, worktree);
5608 	if (error)
5609 		goto done;
5610 
5611 	init_curses();
5612 
5613 	error = apply_unveil(got_repo_get_path(repo), NULL);
5614 	if (error)
5615 		goto done;
5616 
5617 	error = tog_load_refs(repo);
5618 	if (error)
5619 		goto done;
5620 
5621 	if (commit_id_arg == NULL) {
5622 		error = got_repo_match_object_id(&commit_id, &label,
5623 		    worktree ? got_worktree_get_head_ref_name(worktree) :
5624 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5625 		if (error)
5626 			goto done;
5627 		head_ref_name = label;
5628 	} else {
5629 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
5630 		if (error == NULL)
5631 			head_ref_name = got_ref_get_name(ref);
5632 		else if (error->code != GOT_ERR_NOT_REF)
5633 			goto done;
5634 		error = got_repo_match_object_id(&commit_id, NULL,
5635 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5636 		if (error)
5637 			goto done;
5638 	}
5639 
5640 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
5641 	if (view == NULL) {
5642 		error = got_error_from_errno("view_open");
5643 		goto done;
5644 	}
5645 	error = open_tree_view(view, commit_id, head_ref_name, repo);
5646 	if (error)
5647 		goto done;
5648 	if (!got_path_is_root_dir(in_repo_path)) {
5649 		error = tree_view_walk_path(&view->state.tree, commit_id,
5650 		    in_repo_path);
5651 		if (error)
5652 			goto done;
5653 	}
5654 
5655 	if (worktree) {
5656 		/* Release work tree lock. */
5657 		got_worktree_close(worktree);
5658 		worktree = NULL;
5659 	}
5660 	error = view_loop(view);
5661 done:
5662 	free(repo_path);
5663 	free(cwd);
5664 	free(commit_id);
5665 	free(label);
5666 	if (ref)
5667 		got_ref_close(ref);
5668 	if (repo) {
5669 		const struct got_error *close_err = got_repo_close(repo);
5670 		if (error == NULL)
5671 			error = close_err;
5672 	}
5673 	tog_free_refs();
5674 	return error;
5675 }
5676 
5677 static const struct got_error *
5678 ref_view_load_refs(struct tog_ref_view_state *s)
5679 {
5680 	struct got_reflist_entry *sre;
5681 	struct tog_reflist_entry *re;
5682 
5683 	s->nrefs = 0;
5684 	TAILQ_FOREACH(sre, &tog_refs, entry) {
5685 		if (strncmp(got_ref_get_name(sre->ref), "refs/got/", 9) == 0)
5686 			continue;
5687 
5688 		re = malloc(sizeof(*re));
5689 		if (re == NULL)
5690 			return got_error_from_errno("malloc");
5691 
5692 		re->ref = got_ref_dup(sre->ref);
5693 		if (re->ref == NULL)
5694 			return got_error_from_errno("got_ref_dup");
5695 		re->idx = s->nrefs++;
5696 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
5697 	}
5698 
5699 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
5700 	return NULL;
5701 }
5702 
5703 void
5704 ref_view_free_refs(struct tog_ref_view_state *s)
5705 {
5706 	struct tog_reflist_entry *re;
5707 
5708 	while (!TAILQ_EMPTY(&s->refs)) {
5709 		re = TAILQ_FIRST(&s->refs);
5710 		TAILQ_REMOVE(&s->refs, re, entry);
5711 		got_ref_close(re->ref);
5712 		free(re);
5713 	}
5714 }
5715 
5716 static const struct got_error *
5717 open_ref_view(struct tog_view *view, struct got_repository *repo)
5718 {
5719 	const struct got_error *err = NULL;
5720 	struct tog_ref_view_state *s = &view->state.ref;
5721 
5722 	s->selected_entry = 0;
5723 	s->repo = repo;
5724 
5725 	TAILQ_INIT(&s->refs);
5726 	STAILQ_INIT(&s->colors);
5727 
5728 	err = ref_view_load_refs(s);
5729 	if (err)
5730 		return err;
5731 
5732 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5733 		err = add_color(&s->colors, "^refs/heads/",
5734 		    TOG_COLOR_REFS_HEADS,
5735 		    get_color_value("TOG_COLOR_REFS_HEADS"));
5736 		if (err)
5737 			goto done;
5738 
5739 		err = add_color(&s->colors, "^refs/tags/",
5740 		    TOG_COLOR_REFS_TAGS,
5741 		    get_color_value("TOG_COLOR_REFS_TAGS"));
5742 		if (err)
5743 			goto done;
5744 
5745 		err = add_color(&s->colors, "^refs/remotes/",
5746 		    TOG_COLOR_REFS_REMOTES,
5747 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
5748 		if (err)
5749 			goto done;
5750 	}
5751 
5752 	view->show = show_ref_view;
5753 	view->input = input_ref_view;
5754 	view->close = close_ref_view;
5755 	view->search_start = search_start_ref_view;
5756 	view->search_next = search_next_ref_view;
5757 done:
5758 	if (err)
5759 		free_colors(&s->colors);
5760 	return err;
5761 }
5762 
5763 static const struct got_error *
5764 close_ref_view(struct tog_view *view)
5765 {
5766 	struct tog_ref_view_state *s = &view->state.ref;
5767 
5768 	ref_view_free_refs(s);
5769 	free_colors(&s->colors);
5770 
5771 	return NULL;
5772 }
5773 
5774 static const struct got_error *
5775 resolve_reflist_entry(struct got_object_id **commit_id,
5776     struct tog_reflist_entry *re, struct got_repository *repo)
5777 {
5778 	const struct got_error *err = NULL;
5779 	struct got_object_id *obj_id;
5780 	struct got_tag_object *tag = NULL;
5781 	int obj_type;
5782 
5783 	*commit_id = NULL;
5784 
5785 	err = got_ref_resolve(&obj_id, repo, re->ref);
5786 	if (err)
5787 		return err;
5788 
5789 	err = got_object_get_type(&obj_type, repo, obj_id);
5790 	if (err)
5791 		goto done;
5792 
5793 	switch (obj_type) {
5794 	case GOT_OBJ_TYPE_COMMIT:
5795 		*commit_id = obj_id;
5796 		break;
5797 	case GOT_OBJ_TYPE_TAG:
5798 		err = got_object_open_as_tag(&tag, repo, obj_id);
5799 		if (err)
5800 			goto done;
5801 		free(obj_id);
5802 		err = got_object_get_type(&obj_type, repo,
5803 		    got_object_tag_get_object_id(tag));
5804 		if (err)
5805 			goto done;
5806 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
5807 			err = got_error(GOT_ERR_OBJ_TYPE);
5808 			goto done;
5809 		}
5810 		*commit_id = got_object_id_dup(
5811 		    got_object_tag_get_object_id(tag));
5812 		if (*commit_id == NULL) {
5813 			err = got_error_from_errno("got_object_id_dup");
5814 			goto done;
5815 		}
5816 		break;
5817 	default:
5818 		err = got_error(GOT_ERR_OBJ_TYPE);
5819 		break;
5820 	}
5821 
5822 done:
5823 	if (tag)
5824 		got_object_tag_close(tag);
5825 	if (err) {
5826 		free(*commit_id);
5827 		*commit_id = NULL;
5828 	}
5829 	return err;
5830 }
5831 
5832 static const struct got_error *
5833 log_ref_entry(struct tog_view **new_view, int begin_x,
5834     struct tog_reflist_entry *re, struct got_repository *repo)
5835 {
5836 	struct tog_view *log_view;
5837 	const struct got_error *err = NULL;
5838 	struct got_object_id *commit_id = NULL;
5839 
5840 	*new_view = NULL;
5841 
5842 	err = resolve_reflist_entry(&commit_id, re, repo);
5843 	if (err) {
5844 		if (err->code != GOT_ERR_OBJ_TYPE)
5845 			return err;
5846 		else
5847 			return NULL;
5848 	}
5849 
5850 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
5851 	if (log_view == NULL) {
5852 		err = got_error_from_errno("view_open");
5853 		goto done;
5854 	}
5855 
5856 	err = open_log_view(log_view, commit_id, repo,
5857 	    got_ref_get_name(re->ref), "", 0);
5858 done:
5859 	if (err)
5860 		view_close(log_view);
5861 	else
5862 		*new_view = log_view;
5863 	free(commit_id);
5864 	return err;
5865 }
5866 
5867 static void
5868 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
5869 {
5870 	struct tog_reflist_entry *re;
5871 	int i = 0;
5872 
5873 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
5874 		return;
5875 
5876 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
5877 	while (i++ < maxscroll) {
5878 		if (re == NULL)
5879 			break;
5880 		s->first_displayed_entry = re;
5881 		re = TAILQ_PREV(re, tog_reflist_head, entry);
5882 	}
5883 }
5884 
5885 static void
5886 ref_scroll_down(struct tog_ref_view_state *s, int maxscroll)
5887 {
5888 	struct tog_reflist_entry *next, *last;
5889 	int n = 0;
5890 
5891 	if (s->first_displayed_entry)
5892 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
5893 	else
5894 		next = TAILQ_FIRST(&s->refs);
5895 
5896 	last = s->last_displayed_entry;
5897 	while (next && last && n++ < maxscroll) {
5898 		last = TAILQ_NEXT(last, entry);
5899 		if (last) {
5900 			s->first_displayed_entry = next;
5901 			next = TAILQ_NEXT(next, entry);
5902 		}
5903 	}
5904 }
5905 
5906 static const struct got_error *
5907 search_start_ref_view(struct tog_view *view)
5908 {
5909 	struct tog_ref_view_state *s = &view->state.ref;
5910 
5911 	s->matched_entry = NULL;
5912 	return NULL;
5913 }
5914 
5915 static int
5916 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
5917 {
5918 	regmatch_t regmatch;
5919 
5920 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
5921 	    0) == 0;
5922 }
5923 
5924 static const struct got_error *
5925 search_next_ref_view(struct tog_view *view)
5926 {
5927 	struct tog_ref_view_state *s = &view->state.ref;
5928 	struct tog_reflist_entry *re = NULL;
5929 
5930 	if (!view->searching) {
5931 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5932 		return NULL;
5933 	}
5934 
5935 	if (s->matched_entry) {
5936 		if (view->searching == TOG_SEARCH_FORWARD) {
5937 			if (s->selected_entry)
5938 				re = TAILQ_NEXT(s->selected_entry, entry);
5939 			else
5940 				re = TAILQ_PREV(s->selected_entry,
5941 				    tog_reflist_head, entry);
5942 		} else {
5943 			if (s->selected_entry == NULL)
5944 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
5945 			else
5946 				re = TAILQ_PREV(s->selected_entry,
5947 				    tog_reflist_head, entry);
5948 		}
5949 	} else {
5950 		if (view->searching == TOG_SEARCH_FORWARD)
5951 			re = TAILQ_FIRST(&s->refs);
5952 		else
5953 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
5954 	}
5955 
5956 	while (1) {
5957 		if (re == NULL) {
5958 			if (s->matched_entry == NULL) {
5959 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5960 				return NULL;
5961 			}
5962 			if (view->searching == TOG_SEARCH_FORWARD)
5963 				re = TAILQ_FIRST(&s->refs);
5964 			else
5965 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
5966 		}
5967 
5968 		if (match_reflist_entry(re, &view->regex)) {
5969 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
5970 			s->matched_entry = re;
5971 			break;
5972 		}
5973 
5974 		if (view->searching == TOG_SEARCH_FORWARD)
5975 			re = TAILQ_NEXT(re, entry);
5976 		else
5977 			re = TAILQ_PREV(re, tog_reflist_head, entry);
5978 	}
5979 
5980 	if (s->matched_entry) {
5981 		s->first_displayed_entry = s->matched_entry;
5982 		s->selected = 0;
5983 	}
5984 
5985 	return NULL;
5986 }
5987 
5988 static const struct got_error *
5989 show_ref_view(struct tog_view *view)
5990 {
5991 	const struct got_error *err = NULL;
5992 	struct tog_ref_view_state *s = &view->state.ref;
5993 	struct tog_reflist_entry *re;
5994 	char *line = NULL;
5995 	wchar_t *wline;
5996 	struct tog_color *tc;
5997 	int width, n;
5998 	int limit = view->nlines;
5999 
6000 	werase(view->window);
6001 
6002 	s->ndisplayed = 0;
6003 
6004 	if (limit == 0)
6005 		return NULL;
6006 
6007 	re = s->first_displayed_entry;
6008 
6009 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
6010 	    s->nrefs) == -1)
6011 		return got_error_from_errno("asprintf");
6012 
6013 	err = format_line(&wline, &width, line, view->ncols, 0);
6014 	if (err) {
6015 		free(line);
6016 		return err;
6017 	}
6018 	if (view_needs_focus_indication(view))
6019 		wstandout(view->window);
6020 	waddwstr(view->window, wline);
6021 	if (view_needs_focus_indication(view))
6022 		wstandend(view->window);
6023 	free(wline);
6024 	wline = NULL;
6025 	free(line);
6026 	line = NULL;
6027 	if (width < view->ncols - 1)
6028 		waddch(view->window, '\n');
6029 	if (--limit <= 0)
6030 		return NULL;
6031 
6032 	n = 0;
6033 	while (re && limit > 0) {
6034 		char *line = NULL;
6035 
6036 		if (got_ref_is_symbolic(re->ref)) {
6037 			if (asprintf(&line, "%s -> %s",
6038 			    got_ref_get_name(re->ref),
6039 			    got_ref_get_symref_target(re->ref)) == -1)
6040 				return got_error_from_errno("asprintf");
6041 		} else if (s->show_ids) {
6042 			struct got_object_id *id;
6043 			char *id_str;
6044 			err = got_ref_resolve(&id, s->repo, re->ref);
6045 			if (err)
6046 				return err;
6047 			err = got_object_id_str(&id_str, id);
6048 			if (err) {
6049 				free(id);
6050 				return err;
6051 			}
6052 			if (asprintf(&line, "%s: %s",
6053 			    got_ref_get_name(re->ref), id_str) == -1) {
6054 				err = got_error_from_errno("asprintf");
6055 				free(id);
6056 				free(id_str);
6057 				return err;
6058 			}
6059 			free(id);
6060 			free(id_str);
6061 		} else {
6062 			line = strdup(got_ref_get_name(re->ref));
6063 			if (line == NULL)
6064 				return got_error_from_errno("strdup");
6065 		}
6066 
6067 		err = format_line(&wline, &width, line, view->ncols, 0);
6068 		if (err) {
6069 			free(line);
6070 			return err;
6071 		}
6072 		if (n == s->selected) {
6073 			if (view->focussed)
6074 				wstandout(view->window);
6075 			s->selected_entry = re;
6076 		}
6077 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
6078 		if (tc)
6079 			wattr_on(view->window,
6080 			    COLOR_PAIR(tc->colorpair), NULL);
6081 		waddwstr(view->window, wline);
6082 		if (tc)
6083 			wattr_off(view->window,
6084 			    COLOR_PAIR(tc->colorpair), NULL);
6085 		if (width < view->ncols - 1)
6086 			waddch(view->window, '\n');
6087 		if (n == s->selected && view->focussed)
6088 			wstandend(view->window);
6089 		free(line);
6090 		free(wline);
6091 		wline = NULL;
6092 		n++;
6093 		s->ndisplayed++;
6094 		s->last_displayed_entry = re;
6095 
6096 		limit--;
6097 		re = TAILQ_NEXT(re, entry);
6098 	}
6099 
6100 	view_vborder(view);
6101 	return err;
6102 }
6103 
6104 static const struct got_error *
6105 browse_ref_tree(struct tog_view **new_view, int begin_x,
6106     struct tog_reflist_entry *re, struct got_repository *repo)
6107 {
6108 	const struct got_error *err = NULL;
6109 	struct got_object_id *commit_id = NULL;
6110 	struct tog_view *tree_view;
6111 
6112 	*new_view = NULL;
6113 
6114 	err = resolve_reflist_entry(&commit_id, re, repo);
6115 	if (err) {
6116 		if (err->code != GOT_ERR_OBJ_TYPE)
6117 			return err;
6118 		else
6119 			return NULL;
6120 	}
6121 
6122 
6123 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
6124 	if (tree_view == NULL) {
6125 		err = got_error_from_errno("view_open");
6126 		goto done;
6127 	}
6128 
6129 	err = open_tree_view(tree_view, commit_id,
6130 	    got_ref_get_name(re->ref), repo);
6131 	if (err)
6132 		goto done;
6133 
6134 	*new_view = tree_view;
6135 done:
6136 	free(commit_id);
6137 	return err;
6138 }
6139 static const struct got_error *
6140 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
6141 {
6142 	const struct got_error *err = NULL;
6143 	struct tog_ref_view_state *s = &view->state.ref;
6144 	struct tog_view *log_view, *tree_view;
6145 	int begin_x = 0;
6146 
6147 	switch (ch) {
6148 	case 'i':
6149 		s->show_ids = !s->show_ids;
6150 		break;
6151 	case KEY_ENTER:
6152 	case '\r':
6153 		if (!s->selected_entry)
6154 			break;
6155 		if (view_is_parent_view(view))
6156 			begin_x = view_split_begin_x(view->begin_x);
6157 		err = log_ref_entry(&log_view, begin_x, s->selected_entry,
6158 		    s->repo);
6159 		view->focussed = 0;
6160 		log_view->focussed = 1;
6161 		if (view_is_parent_view(view)) {
6162 			err = view_close_child(view);
6163 			if (err)
6164 				return err;
6165 			view_set_child(view, log_view);
6166 			view->focus_child = 1;
6167 		} else
6168 			*new_view = log_view;
6169 		break;
6170 	case 't':
6171 		if (!s->selected_entry)
6172 			break;
6173 		if (view_is_parent_view(view))
6174 			begin_x = view_split_begin_x(view->begin_x);
6175 		err = browse_ref_tree(&tree_view, begin_x, s->selected_entry,
6176 		    s->repo);
6177 		if (err || tree_view == NULL)
6178 			break;
6179 		view->focussed = 0;
6180 		tree_view->focussed = 1;
6181 		if (view_is_parent_view(view)) {
6182 			err = view_close_child(view);
6183 			if (err)
6184 				return err;
6185 			view_set_child(view, tree_view);
6186 			view->focus_child = 1;
6187 		} else
6188 			*new_view = tree_view;
6189 		break;
6190 	case 'k':
6191 	case KEY_UP:
6192 		if (s->selected > 0) {
6193 			s->selected--;
6194 			break;
6195 		}
6196 		ref_scroll_up(s, 1);
6197 		break;
6198 	case KEY_PPAGE:
6199 	case CTRL('b'):
6200 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
6201 			s->selected = 0;
6202 		ref_scroll_up(s, MAX(0, view->nlines - 1));
6203 		break;
6204 	case 'j':
6205 	case KEY_DOWN:
6206 		if (s->selected < s->ndisplayed - 1) {
6207 			s->selected++;
6208 			break;
6209 		}
6210 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL)
6211 			/* can't scroll any further */
6212 			break;
6213 		ref_scroll_down(s, 1);
6214 		break;
6215 	case KEY_NPAGE:
6216 	case CTRL('f'):
6217 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
6218 			/* can't scroll any further; move cursor down */
6219 			if (s->selected < s->ndisplayed - 1)
6220 				s->selected = s->ndisplayed - 1;
6221 			break;
6222 		}
6223 		ref_scroll_down(s, view->nlines - 1);
6224 		break;
6225 	case CTRL('l'):
6226 		tog_free_refs();
6227 		err = tog_load_refs(s->repo);
6228 		if (err)
6229 			break;
6230 		ref_view_free_refs(s);
6231 		err = ref_view_load_refs(s);
6232 		break;
6233 	case KEY_RESIZE:
6234 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
6235 			s->selected = view->nlines - 2;
6236 		break;
6237 	default:
6238 		break;
6239 	}
6240 
6241 	return err;
6242 }
6243 
6244 __dead static void
6245 usage_ref(void)
6246 {
6247 	endwin();
6248 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
6249 	    getprogname());
6250 	exit(1);
6251 }
6252 
6253 static const struct got_error *
6254 cmd_ref(int argc, char *argv[])
6255 {
6256 	const struct got_error *error;
6257 	struct got_repository *repo = NULL;
6258 	struct got_worktree *worktree = NULL;
6259 	char *cwd = NULL, *repo_path = NULL;
6260 	int ch;
6261 	struct tog_view *view;
6262 
6263 	while ((ch = getopt(argc, argv, "r:")) != -1) {
6264 		switch (ch) {
6265 		case 'r':
6266 			repo_path = realpath(optarg, NULL);
6267 			if (repo_path == NULL)
6268 				return got_error_from_errno2("realpath",
6269 				    optarg);
6270 			break;
6271 		default:
6272 			usage_ref();
6273 			/* NOTREACHED */
6274 		}
6275 	}
6276 
6277 	argc -= optind;
6278 	argv += optind;
6279 
6280 	if (argc > 1)
6281 		usage_ref();
6282 
6283 	if (repo_path == NULL) {
6284 		cwd = getcwd(NULL, 0);
6285 		if (cwd == NULL)
6286 			return got_error_from_errno("getcwd");
6287 		error = got_worktree_open(&worktree, cwd);
6288 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6289 			goto done;
6290 		if (worktree)
6291 			repo_path =
6292 			    strdup(got_worktree_get_repo_path(worktree));
6293 		else
6294 			repo_path = strdup(cwd);
6295 		if (repo_path == NULL) {
6296 			error = got_error_from_errno("strdup");
6297 			goto done;
6298 		}
6299 	}
6300 
6301 	error = got_repo_open(&repo, repo_path, NULL);
6302 	if (error != NULL)
6303 		goto done;
6304 
6305 	init_curses();
6306 
6307 	error = apply_unveil(got_repo_get_path(repo), NULL);
6308 	if (error)
6309 		goto done;
6310 
6311 	error = tog_load_refs(repo);
6312 	if (error)
6313 		goto done;
6314 
6315 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
6316 	if (view == NULL) {
6317 		error = got_error_from_errno("view_open");
6318 		goto done;
6319 	}
6320 
6321 	error = open_ref_view(view, repo);
6322 	if (error)
6323 		goto done;
6324 
6325 	if (worktree) {
6326 		/* Release work tree lock. */
6327 		got_worktree_close(worktree);
6328 		worktree = NULL;
6329 	}
6330 	error = view_loop(view);
6331 done:
6332 	free(repo_path);
6333 	free(cwd);
6334 	if (repo) {
6335 		const struct got_error *close_err = got_repo_close(repo);
6336 		if (close_err)
6337 			error = close_err;
6338 	}
6339 	tog_free_refs();
6340 	return error;
6341 }
6342 
6343 static void
6344 list_commands(FILE *fp)
6345 {
6346 	size_t i;
6347 
6348 	fprintf(fp, "commands:");
6349 	for (i = 0; i < nitems(tog_commands); i++) {
6350 		struct tog_cmd *cmd = &tog_commands[i];
6351 		fprintf(fp, " %s", cmd->name);
6352 	}
6353 	fputc('\n', fp);
6354 }
6355 
6356 __dead static void
6357 usage(int hflag, int status)
6358 {
6359 	FILE *fp = (status == 0) ? stdout : stderr;
6360 
6361 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
6362 	    getprogname());
6363 	if (hflag) {
6364 		fprintf(fp, "lazy usage: %s path\n", getprogname());
6365 		list_commands(fp);
6366 	}
6367 	exit(status);
6368 }
6369 
6370 static char **
6371 make_argv(int argc, ...)
6372 {
6373 	va_list ap;
6374 	char **argv;
6375 	int i;
6376 
6377 	va_start(ap, argc);
6378 
6379 	argv = calloc(argc, sizeof(char *));
6380 	if (argv == NULL)
6381 		err(1, "calloc");
6382 	for (i = 0; i < argc; i++) {
6383 		argv[i] = strdup(va_arg(ap, char *));
6384 		if (argv[i] == NULL)
6385 			err(1, "strdup");
6386 	}
6387 
6388 	va_end(ap);
6389 	return argv;
6390 }
6391 
6392 /*
6393  * Try to convert 'tog path' into a 'tog log path' command.
6394  * The user could simply have mistyped the command rather than knowingly
6395  * provided a path. So check whether argv[0] can in fact be resolved
6396  * to a path in the HEAD commit and print a special error if not.
6397  * This hack is for mpi@ <3
6398  */
6399 static const struct got_error *
6400 tog_log_with_path(int argc, char *argv[])
6401 {
6402 	const struct got_error *error = NULL, *close_err;
6403 	struct tog_cmd *cmd = NULL;
6404 	struct got_repository *repo = NULL;
6405 	struct got_worktree *worktree = NULL;
6406 	struct got_object_id *commit_id = NULL, *id = NULL;
6407 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6408 	char *commit_id_str = NULL, **cmd_argv = NULL;
6409 
6410 	cwd = getcwd(NULL, 0);
6411 	if (cwd == NULL)
6412 		return got_error_from_errno("getcwd");
6413 
6414 	error = got_worktree_open(&worktree, cwd);
6415 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
6416 		goto done;
6417 
6418 	if (worktree)
6419 		repo_path = strdup(got_worktree_get_repo_path(worktree));
6420 	else
6421 		repo_path = strdup(cwd);
6422 	if (repo_path == NULL) {
6423 		error = got_error_from_errno("strdup");
6424 		goto done;
6425 	}
6426 
6427 	error = got_repo_open(&repo, repo_path, NULL);
6428 	if (error != NULL)
6429 		goto done;
6430 
6431 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
6432 	    repo, worktree);
6433 	if (error)
6434 		goto done;
6435 
6436 	error = tog_load_refs(repo);
6437 	if (error)
6438 		goto done;
6439 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
6440 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
6441 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6442 	if (error)
6443 		goto done;
6444 
6445 	if (worktree) {
6446 		got_worktree_close(worktree);
6447 		worktree = NULL;
6448 	}
6449 
6450 	error = got_object_id_by_path(&id, repo, commit_id, in_repo_path);
6451 	if (error) {
6452 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
6453 			goto done;
6454 		fprintf(stderr, "%s: '%s' is no known command or path\n",
6455 		    getprogname(), argv[0]);
6456 		usage(1, 1);
6457 		/* not reached */
6458 	}
6459 
6460 	close_err = got_repo_close(repo);
6461 	if (error == NULL)
6462 		error = close_err;
6463 	repo = NULL;
6464 
6465 	error = got_object_id_str(&commit_id_str, commit_id);
6466 	if (error)
6467 		goto done;
6468 
6469 	cmd = &tog_commands[0]; /* log */
6470 	argc = 4;
6471 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
6472 	error = cmd->cmd_main(argc, cmd_argv);
6473 done:
6474 	if (repo) {
6475 		close_err = got_repo_close(repo);
6476 		if (error == NULL)
6477 			error = close_err;
6478 	}
6479 	if (worktree)
6480 		got_worktree_close(worktree);
6481 	free(id);
6482 	free(commit_id_str);
6483 	free(commit_id);
6484 	free(cwd);
6485 	free(repo_path);
6486 	free(in_repo_path);
6487 	if (cmd_argv) {
6488 		int i;
6489 		for (i = 0; i < argc; i++)
6490 			free(cmd_argv[i]);
6491 		free(cmd_argv);
6492 	}
6493 	tog_free_refs();
6494 	return error;
6495 }
6496 
6497 int
6498 main(int argc, char *argv[])
6499 {
6500 	const struct got_error *error = NULL;
6501 	struct tog_cmd *cmd = NULL;
6502 	int ch, hflag = 0, Vflag = 0;
6503 	char **cmd_argv = NULL;
6504 	static struct option longopts[] = {
6505 	    { "version", no_argument, NULL, 'V' },
6506 	    { NULL, 0, NULL, 0}
6507 	};
6508 
6509 	setlocale(LC_CTYPE, "");
6510 
6511 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
6512 		switch (ch) {
6513 		case 'h':
6514 			hflag = 1;
6515 			break;
6516 		case 'V':
6517 			Vflag = 1;
6518 			break;
6519 		default:
6520 			usage(hflag, 1);
6521 			/* NOTREACHED */
6522 		}
6523 	}
6524 
6525 	argc -= optind;
6526 	argv += optind;
6527 	optind = 1;
6528 	optreset = 1;
6529 
6530 	if (Vflag) {
6531 		got_version_print_str();
6532 		return 0;
6533 	}
6534 
6535 #ifndef PROFILE
6536 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
6537 	    NULL) == -1)
6538 		err(1, "pledge");
6539 #endif
6540 
6541 	if (argc == 0) {
6542 		if (hflag)
6543 			usage(hflag, 0);
6544 		/* Build an argument vector which runs a default command. */
6545 		cmd = &tog_commands[0];
6546 		argc = 1;
6547 		cmd_argv = make_argv(argc, cmd->name);
6548 	} else {
6549 		size_t i;
6550 
6551 		/* Did the user specify a command? */
6552 		for (i = 0; i < nitems(tog_commands); i++) {
6553 			if (strncmp(tog_commands[i].name, argv[0],
6554 			    strlen(argv[0])) == 0) {
6555 				cmd = &tog_commands[i];
6556 				break;
6557 			}
6558 		}
6559 	}
6560 
6561 	if (cmd == NULL) {
6562 		if (argc != 1)
6563 			usage(0, 1);
6564 		/* No command specified; try log with a path */
6565 		error = tog_log_with_path(argc, argv);
6566 	} else {
6567 		if (hflag)
6568 			cmd->cmd_usage();
6569 		else
6570 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
6571 	}
6572 
6573 	endwin();
6574 	putchar('\n');
6575 	if (cmd_argv) {
6576 		int i;
6577 		for (i = 0; i < argc; i++)
6578 			free(cmd_argv[i]);
6579 		free(cmd_argv);
6580 	}
6581 
6582 	if (error && error->code != GOT_ERR_CANCELLED)
6583 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
6584 	return 0;
6585 }