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