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