1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/stat.h>
18 #include <sys/ioctl.h>
19 
20 #include <ctype.h>
21 #include <errno.h>
22 #if defined(__FreeBSD__) || defined(__APPLE__)
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #endif
25 #include <curses.h>
26 #include <panel.h>
27 #include <locale.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_compat.h"
45 
46 #include "got_version.h"
47 #include "got_error.h"
48 #include "got_object.h"
49 #include "got_reference.h"
50 #include "got_repository.h"
51 #include "got_diff.h"
52 #include "got_opentemp.h"
53 #include "got_utf8.h"
54 #include "got_cancel.h"
55 #include "got_commit_graph.h"
56 #include "got_blame.h"
57 #include "got_privsep.h"
58 #include "got_path.h"
59 #include "got_worktree.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #ifndef CTRL
70 #define CTRL(x)		((x) & 0x1f)
71 #endif
72 
73 #ifndef nitems
74 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
75 #endif
76 
77 struct tog_cmd {
78 	const char *name;
79 	const struct got_error *(*cmd_main)(int, char *[]);
80 	void (*cmd_usage)(void);
81 };
82 
83 __dead static void	usage(int, int);
84 __dead static void	usage_log(void);
85 __dead static void	usage_diff(void);
86 __dead static void	usage_blame(void);
87 __dead static void	usage_tree(void);
88 __dead static void	usage_ref(void);
89 
90 static const struct got_error*	cmd_log(int, char *[]);
91 static const struct got_error*	cmd_diff(int, char *[]);
92 static const struct got_error*	cmd_blame(int, char *[]);
93 static const struct got_error*	cmd_tree(int, char *[]);
94 static const struct got_error*	cmd_ref(int, char *[]);
95 
96 static const struct tog_cmd tog_commands[] = {
97 	{ "log",	cmd_log,	usage_log },
98 	{ "diff",	cmd_diff,	usage_diff },
99 	{ "blame",	cmd_blame,	usage_blame },
100 	{ "tree",	cmd_tree,	usage_tree },
101 	{ "ref",	cmd_ref,	usage_ref },
102 };
103 
104 enum tog_view_type {
105 	TOG_VIEW_DIFF,
106 	TOG_VIEW_LOG,
107 	TOG_VIEW_BLAME,
108 	TOG_VIEW_TREE,
109 	TOG_VIEW_REF,
110 };
111 
112 enum tog_view_mode {
113 	TOG_VIEW_SPLIT_NONE,
114 	TOG_VIEW_SPLIT_VERT,
115 	TOG_VIEW_SPLIT_HRZN
116 };
117 
118 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
119 
120 #define TOG_EOF_STRING	"(END)"
121 
122 struct commit_queue_entry {
123 	TAILQ_ENTRY(commit_queue_entry) entry;
124 	struct got_object_id *id;
125 	struct got_commit_object *commit;
126 	int idx;
127 };
128 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
129 struct commit_queue {
130 	int ncommits;
131 	struct commit_queue_head head;
132 };
133 
134 struct tog_color {
135 	STAILQ_ENTRY(tog_color) entry;
136 	regex_t regex;
137 	short colorpair;
138 };
139 STAILQ_HEAD(tog_colors, tog_color);
140 
141 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
142 static struct got_reflist_object_id_map *tog_refs_idmap;
143 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
144 
145 static const struct got_error *
146 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
147     struct got_reference* re2)
148 {
149 	const char *name1 = got_ref_get_name(re1);
150 	const char *name2 = got_ref_get_name(re2);
151 	int isbackup1, isbackup2;
152 
153 	/* Sort backup refs towards the bottom of the list. */
154 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
155 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
156 	if (!isbackup1 && isbackup2) {
157 		*cmp = -1;
158 		return NULL;
159 	} else if (isbackup1 && !isbackup2) {
160 		*cmp = 1;
161 		return NULL;
162 	}
163 
164 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
165 	return NULL;
166 }
167 
168 static const struct got_error *
169 tog_load_refs(struct got_repository *repo, int sort_by_date)
170 {
171 	const struct got_error *err;
172 
173 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
174 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
175 	    repo);
176 	if (err)
177 		return err;
178 
179 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
180 	    repo);
181 }
182 
183 static void
184 tog_free_refs(void)
185 {
186 	if (tog_refs_idmap) {
187 		got_reflist_object_id_map_free(tog_refs_idmap);
188 		tog_refs_idmap = NULL;
189 	}
190 	got_ref_list_free(&tog_refs);
191 }
192 
193 static const struct got_error *
194 add_color(struct tog_colors *colors, const char *pattern,
195     int idx, short color)
196 {
197 	const struct got_error *err = NULL;
198 	struct tog_color *tc;
199 	int regerr = 0;
200 
201 	if (idx < 1 || idx > COLOR_PAIRS - 1)
202 		return NULL;
203 
204 	init_pair(idx, color, -1);
205 
206 	tc = calloc(1, sizeof(*tc));
207 	if (tc == NULL)
208 		return got_error_from_errno("calloc");
209 	regerr = regcomp(&tc->regex, pattern,
210 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
211 	if (regerr) {
212 		static char regerr_msg[512];
213 		static char err_msg[512];
214 		regerror(regerr, &tc->regex, regerr_msg,
215 		    sizeof(regerr_msg));
216 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
217 		    regerr_msg);
218 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
219 		free(tc);
220 		return err;
221 	}
222 	tc->colorpair = idx;
223 	STAILQ_INSERT_HEAD(colors, tc, entry);
224 	return NULL;
225 }
226 
227 static void
228 free_colors(struct tog_colors *colors)
229 {
230 	struct tog_color *tc;
231 
232 	while (!STAILQ_EMPTY(colors)) {
233 		tc = STAILQ_FIRST(colors);
234 		STAILQ_REMOVE_HEAD(colors, entry);
235 		regfree(&tc->regex);
236 		free(tc);
237 	}
238 }
239 
240 static struct tog_color *
241 get_color(struct tog_colors *colors, int colorpair)
242 {
243 	struct tog_color *tc = NULL;
244 
245 	STAILQ_FOREACH(tc, colors, entry) {
246 		if (tc->colorpair == colorpair)
247 			return tc;
248 	}
249 
250 	return NULL;
251 }
252 
253 static int
254 default_color_value(const char *envvar)
255 {
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
257 		return COLOR_MAGENTA;
258 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
259 		return COLOR_CYAN;
260 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
261 		return COLOR_YELLOW;
262 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
263 		return COLOR_GREEN;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
265 		return COLOR_MAGENTA;
266 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
271 		return COLOR_GREEN;
272 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
275 		return COLOR_CYAN;
276 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
279 		return COLOR_GREEN;
280 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
283 		return COLOR_YELLOW;
284 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
285 		return COLOR_CYAN;
286 
287 	return -1;
288 }
289 
290 static int
291 get_color_value(const char *envvar)
292 {
293 	const char *val = getenv(envvar);
294 
295 	if (val == NULL)
296 		return default_color_value(envvar);
297 
298 	if (strcasecmp(val, "black") == 0)
299 		return COLOR_BLACK;
300 	if (strcasecmp(val, "red") == 0)
301 		return COLOR_RED;
302 	if (strcasecmp(val, "green") == 0)
303 		return COLOR_GREEN;
304 	if (strcasecmp(val, "yellow") == 0)
305 		return COLOR_YELLOW;
306 	if (strcasecmp(val, "blue") == 0)
307 		return COLOR_BLUE;
308 	if (strcasecmp(val, "magenta") == 0)
309 		return COLOR_MAGENTA;
310 	if (strcasecmp(val, "cyan") == 0)
311 		return COLOR_CYAN;
312 	if (strcasecmp(val, "white") == 0)
313 		return COLOR_WHITE;
314 	if (strcasecmp(val, "default") == 0)
315 		return -1;
316 
317 	return default_color_value(envvar);
318 }
319 
320 
321 struct tog_diff_view_state {
322 	struct got_object_id *id1, *id2;
323 	const char *label1, *label2;
324 	FILE *f, *f1, *f2;
325 	int fd1, fd2;
326 	int first_displayed_line;
327 	int last_displayed_line;
328 	int eof;
329 	int diff_context;
330 	int ignore_whitespace;
331 	int force_text_diff;
332 	struct got_repository *repo;
333 	struct tog_colors colors;
334 	size_t nlines;
335 	off_t *line_offsets;
336 	int matched_line;
337 	int selected_line;
338 
339 	/* passed from log or blame view; may be NULL */
340 	struct tog_view *parent_view;
341 };
342 
343 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
344 static volatile sig_atomic_t tog_thread_error;
345 
346 struct tog_log_thread_args {
347 	pthread_cond_t need_commits;
348 	pthread_cond_t commit_loaded;
349 	int commits_needed;
350 	int load_all;
351 	struct got_commit_graph *graph;
352 	struct commit_queue *commits;
353 	const char *in_repo_path;
354 	struct got_object_id *start_id;
355 	struct got_repository *repo;
356 	int *pack_fds;
357 	int log_complete;
358 	sig_atomic_t *quit;
359 	struct commit_queue_entry **first_displayed_entry;
360 	struct commit_queue_entry **selected_entry;
361 	int *searching;
362 	int *search_next_done;
363 	regex_t *regex;
364 };
365 
366 struct tog_log_view_state {
367 	struct commit_queue commits;
368 	struct commit_queue_entry *first_displayed_entry;
369 	struct commit_queue_entry *last_displayed_entry;
370 	struct commit_queue_entry *selected_entry;
371 	int selected;
372 	char *in_repo_path;
373 	char *head_ref_name;
374 	int log_branches;
375 	struct got_repository *repo;
376 	struct got_object_id *start_id;
377 	sig_atomic_t quit;
378 	pthread_t thread;
379 	struct tog_log_thread_args thread_args;
380 	struct commit_queue_entry *matched_entry;
381 	struct commit_queue_entry *search_entry;
382 	struct tog_colors colors;
383 };
384 
385 #define TOG_COLOR_DIFF_MINUS		1
386 #define TOG_COLOR_DIFF_PLUS		2
387 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
388 #define TOG_COLOR_DIFF_META		4
389 #define TOG_COLOR_TREE_SUBMODULE	5
390 #define TOG_COLOR_TREE_SYMLINK		6
391 #define TOG_COLOR_TREE_DIRECTORY	7
392 #define TOG_COLOR_TREE_EXECUTABLE	8
393 #define TOG_COLOR_COMMIT		9
394 #define TOG_COLOR_AUTHOR		10
395 #define TOG_COLOR_DATE			11
396 #define TOG_COLOR_REFS_HEADS		12
397 #define TOG_COLOR_REFS_TAGS		13
398 #define TOG_COLOR_REFS_REMOTES		14
399 #define TOG_COLOR_REFS_BACKUP		15
400 
401 struct tog_blame_cb_args {
402 	struct tog_blame_line *lines; /* one per line */
403 	int nlines;
404 
405 	struct tog_view *view;
406 	struct got_object_id *commit_id;
407 	int *quit;
408 };
409 
410 struct tog_blame_thread_args {
411 	const char *path;
412 	struct got_repository *repo;
413 	struct tog_blame_cb_args *cb_args;
414 	int *complete;
415 	got_cancel_cb cancel_cb;
416 	void *cancel_arg;
417 };
418 
419 struct tog_blame {
420 	FILE *f;
421 	off_t filesize;
422 	struct tog_blame_line *lines;
423 	int nlines;
424 	off_t *line_offsets;
425 	pthread_t thread;
426 	struct tog_blame_thread_args thread_args;
427 	struct tog_blame_cb_args cb_args;
428 	const char *path;
429 	int *pack_fds;
430 };
431 
432 struct tog_blame_view_state {
433 	int first_displayed_line;
434 	int last_displayed_line;
435 	int selected_line;
436 	int last_diffed_line;
437 	int blame_complete;
438 	int eof;
439 	int done;
440 	struct got_object_id_queue blamed_commits;
441 	struct got_object_qid *blamed_commit;
442 	char *path;
443 	struct got_repository *repo;
444 	struct got_object_id *commit_id;
445 	struct tog_blame blame;
446 	int matched_line;
447 	struct tog_colors colors;
448 };
449 
450 struct tog_parent_tree {
451 	TAILQ_ENTRY(tog_parent_tree) entry;
452 	struct got_tree_object *tree;
453 	struct got_tree_entry *first_displayed_entry;
454 	struct got_tree_entry *selected_entry;
455 	int selected;
456 };
457 
458 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
459 
460 struct tog_tree_view_state {
461 	char *tree_label;
462 	struct got_object_id *commit_id;/* commit which this tree belongs to */
463 	struct got_tree_object *root;	/* the commit's root tree entry */
464 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
465 	struct got_tree_entry *first_displayed_entry;
466 	struct got_tree_entry *last_displayed_entry;
467 	struct got_tree_entry *selected_entry;
468 	int ndisplayed, selected, show_ids;
469 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
470 	char *head_ref_name;
471 	struct got_repository *repo;
472 	struct got_tree_entry *matched_entry;
473 	struct tog_colors colors;
474 };
475 
476 struct tog_reflist_entry {
477 	TAILQ_ENTRY(tog_reflist_entry) entry;
478 	struct got_reference *ref;
479 	int idx;
480 };
481 
482 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
483 
484 struct tog_ref_view_state {
485 	struct tog_reflist_head refs;
486 	struct tog_reflist_entry *first_displayed_entry;
487 	struct tog_reflist_entry *last_displayed_entry;
488 	struct tog_reflist_entry *selected_entry;
489 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
490 	struct got_repository *repo;
491 	struct tog_reflist_entry *matched_entry;
492 	struct tog_colors colors;
493 };
494 
495 /*
496  * We implement two types of views: parent views and child views.
497  *
498  * The 'Tab' key switches focus between a parent view and its child view.
499  * Child views are shown side-by-side to their parent view, provided
500  * there is enough screen estate.
501  *
502  * When a new view is opened from within a parent view, this new view
503  * becomes a child view of the parent view, replacing any existing child.
504  *
505  * When a new view is opened from within a child view, this new view
506  * becomes a parent view which will obscure the views below until the
507  * user quits the new parent view by typing 'q'.
508  *
509  * This list of views contains parent views only.
510  * Child views are only pointed to by their parent view.
511  */
512 TAILQ_HEAD(tog_view_list_head, tog_view);
513 
514 struct tog_view {
515 	TAILQ_ENTRY(tog_view) entry;
516 	WINDOW *window;
517 	PANEL *panel;
518 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
519 	int resized_y, resized_x; /* begin_y/x based on user resizing */
520 	int maxx, x; /* max column and current start column */
521 	int lines, cols; /* copies of LINES and COLS */
522 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
523 	int ch, count; /* current keymap and count prefix */
524 	int resize; /* set when in a resize event */
525 	int focussed; /* Only set on one parent or child view at a time. */
526 	int dying;
527 	struct tog_view *parent;
528 	struct tog_view *child;
529 
530 	/*
531 	 * This flag is initially set on parent views when a new child view
532 	 * is created. It gets toggled when the 'Tab' key switches focus
533 	 * between parent and child.
534 	 * The flag indicates whether focus should be passed on to our child
535 	 * view if this parent view gets picked for focus after another parent
536 	 * view was closed. This prevents child views from losing focus in such
537 	 * situations.
538 	 */
539 	int focus_child;
540 
541 	enum tog_view_mode mode;
542 	/* type-specific state */
543 	enum tog_view_type type;
544 	union {
545 		struct tog_diff_view_state diff;
546 		struct tog_log_view_state log;
547 		struct tog_blame_view_state blame;
548 		struct tog_tree_view_state tree;
549 		struct tog_ref_view_state ref;
550 	} state;
551 
552 	const struct got_error *(*show)(struct tog_view *);
553 	const struct got_error *(*input)(struct tog_view **,
554 	    struct tog_view *, int);
555 	const struct got_error *(*reset)(struct tog_view *);
556 	const struct got_error *(*close)(struct tog_view *);
557 
558 	const struct got_error *(*search_start)(struct tog_view *);
559 	const struct got_error *(*search_next)(struct tog_view *);
560 	int search_started;
561 	int searching;
562 #define TOG_SEARCH_FORWARD	1
563 #define TOG_SEARCH_BACKWARD	2
564 	int search_next_done;
565 #define TOG_SEARCH_HAVE_MORE	1
566 #define TOG_SEARCH_NO_MORE	2
567 #define TOG_SEARCH_HAVE_NONE	3
568 	regex_t regex;
569 	regmatch_t regmatch;
570 };
571 
572 static const struct got_error *open_diff_view(struct tog_view *,
573     struct got_object_id *, struct got_object_id *,
574     const char *, const char *, int, int, int, struct tog_view *,
575     struct got_repository *);
576 static const struct got_error *show_diff_view(struct tog_view *);
577 static const struct got_error *input_diff_view(struct tog_view **,
578     struct tog_view *, int);
579 static const struct got_error *reset_diff_view(struct tog_view *);
580 static const struct got_error* close_diff_view(struct tog_view *);
581 static const struct got_error *search_start_diff_view(struct tog_view *);
582 static const struct got_error *search_next_diff_view(struct tog_view *);
583 
584 static const struct got_error *open_log_view(struct tog_view *,
585     struct got_object_id *, struct got_repository *,
586     const char *, const char *, int);
587 static const struct got_error * show_log_view(struct tog_view *);
588 static const struct got_error *input_log_view(struct tog_view **,
589     struct tog_view *, int);
590 static const struct got_error *close_log_view(struct tog_view *);
591 static const struct got_error *search_start_log_view(struct tog_view *);
592 static const struct got_error *search_next_log_view(struct tog_view *);
593 
594 static const struct got_error *open_blame_view(struct tog_view *, char *,
595     struct got_object_id *, struct got_repository *);
596 static const struct got_error *show_blame_view(struct tog_view *);
597 static const struct got_error *input_blame_view(struct tog_view **,
598     struct tog_view *, int);
599 static const struct got_error *reset_blame_view(struct tog_view *);
600 static const struct got_error *close_blame_view(struct tog_view *);
601 static const struct got_error *search_start_blame_view(struct tog_view *);
602 static const struct got_error *search_next_blame_view(struct tog_view *);
603 
604 static const struct got_error *open_tree_view(struct tog_view *,
605     struct got_object_id *, const char *, struct got_repository *);
606 static const struct got_error *show_tree_view(struct tog_view *);
607 static const struct got_error *input_tree_view(struct tog_view **,
608     struct tog_view *, int);
609 static const struct got_error *close_tree_view(struct tog_view *);
610 static const struct got_error *search_start_tree_view(struct tog_view *);
611 static const struct got_error *search_next_tree_view(struct tog_view *);
612 
613 static const struct got_error *open_ref_view(struct tog_view *,
614     struct got_repository *);
615 static const struct got_error *show_ref_view(struct tog_view *);
616 static const struct got_error *input_ref_view(struct tog_view **,
617     struct tog_view *, int);
618 static const struct got_error *close_ref_view(struct tog_view *);
619 static const struct got_error *search_start_ref_view(struct tog_view *);
620 static const struct got_error *search_next_ref_view(struct tog_view *);
621 
622 static volatile sig_atomic_t tog_sigwinch_received;
623 static volatile sig_atomic_t tog_sigpipe_received;
624 static volatile sig_atomic_t tog_sigcont_received;
625 static volatile sig_atomic_t tog_sigint_received;
626 static volatile sig_atomic_t tog_sigterm_received;
627 
628 static void
629 tog_sigwinch(int signo)
630 {
631 	tog_sigwinch_received = 1;
632 }
633 
634 static void
635 tog_sigpipe(int signo)
636 {
637 	tog_sigpipe_received = 1;
638 }
639 
640 static void
641 tog_sigcont(int signo)
642 {
643 	tog_sigcont_received = 1;
644 }
645 
646 static void
647 tog_sigint(int signo)
648 {
649 	tog_sigint_received = 1;
650 }
651 
652 static void
653 tog_sigterm(int signo)
654 {
655 	tog_sigterm_received = 1;
656 }
657 
658 static int
659 tog_fatal_signal_received(void)
660 {
661 	return (tog_sigpipe_received ||
662 	    tog_sigint_received || tog_sigint_received);
663 }
664 
665 static const struct got_error *
666 view_close(struct tog_view *view)
667 {
668 	const struct got_error *err = NULL, *child_err = NULL;
669 
670 	if (view->child) {
671 		child_err = view_close(view->child);
672 		view->child = NULL;
673 	}
674 	if (view->close)
675 		err = view->close(view);
676 	if (view->panel)
677 		del_panel(view->panel);
678 	if (view->window)
679 		delwin(view->window);
680 	free(view);
681 	return err ? err : child_err;
682 }
683 
684 static struct tog_view *
685 view_open(int nlines, int ncols, int begin_y, int begin_x,
686     enum tog_view_type type)
687 {
688 	struct tog_view *view = calloc(1, sizeof(*view));
689 
690 	if (view == NULL)
691 		return NULL;
692 
693 	view->type = type;
694 	view->lines = LINES;
695 	view->cols = COLS;
696 	view->nlines = nlines ? nlines : LINES - begin_y;
697 	view->ncols = ncols ? ncols : COLS - begin_x;
698 	view->begin_y = begin_y;
699 	view->begin_x = begin_x;
700 	view->window = newwin(nlines, ncols, begin_y, begin_x);
701 	if (view->window == NULL) {
702 		view_close(view);
703 		return NULL;
704 	}
705 	view->panel = new_panel(view->window);
706 	if (view->panel == NULL ||
707 	    set_panel_userptr(view->panel, view) != OK) {
708 		view_close(view);
709 		return NULL;
710 	}
711 
712 	keypad(view->window, TRUE);
713 	return view;
714 }
715 
716 static int
717 view_split_begin_x(int begin_x)
718 {
719 	if (begin_x > 0 || COLS < 120)
720 		return 0;
721 	return (COLS - MAX(COLS / 2, 80));
722 }
723 
724 /* XXX Stub till we decide what to do. */
725 static int
726 view_split_begin_y(int lines)
727 {
728 	return lines * HSPLIT_SCALE;
729 }
730 
731 static const struct got_error *view_resize(struct tog_view *);
732 
733 static const struct got_error *
734 view_splitscreen(struct tog_view *view)
735 {
736 	const struct got_error *err = NULL;
737 
738 	if (!view->resize && view->mode == TOG_VIEW_SPLIT_HRZN) {
739 		if (view->resized_y && view->resized_y < view->lines)
740 			view->begin_y = view->resized_y;
741 		else
742 			view->begin_y = view_split_begin_y(view->nlines);
743 		view->begin_x = 0;
744 	} else if (!view->resize) {
745 		if (view->resized_x && view->resized_x < view->cols - 1 &&
746 		    view->cols > 119)
747 			view->begin_x = view->resized_x;
748 		else
749 			view->begin_x = view_split_begin_x(0);
750 		view->begin_y = 0;
751 	}
752 	view->nlines = LINES - view->begin_y;
753 	view->ncols = COLS - view->begin_x;
754 	view->lines = LINES;
755 	view->cols = COLS;
756 	err = view_resize(view);
757 	if (err)
758 		return err;
759 
760 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
761 		view->parent->nlines = view->begin_y;
762 
763 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
764 		return got_error_from_errno("mvwin");
765 
766 	return NULL;
767 }
768 
769 static const struct got_error *
770 view_fullscreen(struct tog_view *view)
771 {
772 	const struct got_error *err = NULL;
773 
774 	view->begin_x = 0;
775 	view->begin_y = view->resize ? view->begin_y : 0;
776 	view->nlines = view->resize ? view->nlines : LINES;
777 	view->ncols = COLS;
778 	view->lines = LINES;
779 	view->cols = COLS;
780 	err = view_resize(view);
781 	if (err)
782 		return err;
783 
784 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
785 		return got_error_from_errno("mvwin");
786 
787 	return NULL;
788 }
789 
790 static int
791 view_is_parent_view(struct tog_view *view)
792 {
793 	return view->parent == NULL;
794 }
795 
796 static int
797 view_is_splitscreen(struct tog_view *view)
798 {
799 	return view->begin_x > 0 || view->begin_y > 0;
800 }
801 
802 static int
803 view_is_fullscreen(struct tog_view *view)
804 {
805 	return view->nlines == LINES && view->ncols == COLS;
806 }
807 
808 static int
809 view_is_hsplit_top(struct tog_view *view)
810 {
811 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
812 	    view_is_splitscreen(view->child);
813 }
814 
815 static void
816 view_border(struct tog_view *view)
817 {
818 	PANEL *panel;
819 	const struct tog_view *view_above;
820 
821 	if (view->parent)
822 		return view_border(view->parent);
823 
824 	panel = panel_above(view->panel);
825 	if (panel == NULL)
826 		return;
827 
828 	view_above = panel_userptr(panel);
829 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
830 		mvwhline(view->window, view_above->begin_y - 1,
831 		    view->begin_x, got_locale_is_utf8() ?
832 		    ACS_HLINE : '-', view->ncols);
833 	else
834 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
835 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
836 }
837 
838 static const struct got_error *view_init_hsplit(struct tog_view *, int);
839 static const struct got_error *request_log_commits(struct tog_view *);
840 static const struct got_error *offset_selection_down(struct tog_view *);
841 static void offset_selection_up(struct tog_view *);
842 static void view_get_split(struct tog_view *, int *, int *);
843 
844 static const struct got_error *
845 view_resize(struct tog_view *view)
846 {
847 	const struct got_error	*err = NULL;
848 	int			 dif, nlines, ncols;
849 
850 	dif = LINES - view->lines;  /* line difference */
851 
852 	if (view->lines > LINES)
853 		nlines = view->nlines - (view->lines - LINES);
854 	else
855 		nlines = view->nlines + (LINES - view->lines);
856 	if (view->cols > COLS)
857 		ncols = view->ncols - (view->cols - COLS);
858 	else
859 		ncols = view->ncols + (COLS - view->cols);
860 
861 	if (view->child) {
862 		int hs = view->child->begin_y;
863 
864 		if (!view_is_fullscreen(view))
865 			view->child->begin_x = view_split_begin_x(view->begin_x);
866 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
867 		    view->child->begin_x == 0) {
868 			ncols = COLS;
869 
870 			view_fullscreen(view->child);
871 			if (view->child->focussed)
872 				show_panel(view->child->panel);
873 			else
874 				show_panel(view->panel);
875 		} else {
876 			ncols = view->child->begin_x;
877 
878 			view_splitscreen(view->child);
879 			show_panel(view->child->panel);
880 		}
881 		/*
882 		 * Request commits if terminal height was increased in a log
883 		 * view so we have enough commits loaded to populate the view.
884 		 */
885 		if (view->type == TOG_VIEW_LOG && dif > 0) {
886 			struct tog_log_view_state *ts = &view->state.log;
887 
888 			if (ts->commits.ncommits < ts->selected_entry->idx +
889 			    view->lines - ts->selected) {
890 				view->nscrolled = ts->selected_entry->idx +
891 				    view->lines - ts->selected -
892 				    ts->commits.ncommits + dif;
893 				err = request_log_commits(view);
894 				if (err)
895 					return err;
896 			}
897 		}
898 
899 		/*
900 		 * XXX This is ugly and needs to be moved into the above
901 		 * logic but "works" for now and my attempts at moving it
902 		 * break either 'tab' or 'F' key maps in horizontal splits.
903 		 */
904 		if (hs) {
905 			err = view_splitscreen(view->child);
906 			if (err)
907 				return err;
908 			if (dif < 0) { /* top split decreased */
909 				err = offset_selection_down(view);
910 				if (err)
911 					return err;
912 			}
913 			view_border(view);
914 			update_panels();
915 			doupdate();
916 			show_panel(view->child->panel);
917 			nlines = view->nlines;
918 		}
919 	} else if (view->parent == NULL)
920 		ncols = COLS;
921 
922 	if (wresize(view->window, nlines, ncols) == ERR)
923 		return got_error_from_errno("wresize");
924 	if (replace_panel(view->panel, view->window) == ERR)
925 		return got_error_from_errno("replace_panel");
926 	wclear(view->window);
927 
928 	view->nlines = nlines;
929 	view->ncols = ncols;
930 	view->lines = LINES;
931 	view->cols = COLS;
932 
933 	return NULL;
934 }
935 
936 static const struct got_error *
937 view_resize_split(struct tog_view *view, int resize)
938 {
939 	const struct got_error	*err = NULL;
940 	struct tog_view		*v = NULL;
941 
942 	if (view->parent)
943 		v = view->parent;
944 	else
945 		v = view;
946 
947 	if (!v->child || !view_is_splitscreen(v->child))
948 		return NULL;
949 
950 	v->resize = v->child->resize = resize;  /* lock for resize event */
951 
952 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
953 		if (v->child->resized_y)
954 			v->child->begin_y = v->child->resized_y;
955 		if (view->parent)
956 			v->child->begin_y -= resize;
957 		else
958 			v->child->begin_y += resize;
959 		if (v->child->begin_y < 3) {
960 			view->count = 0;
961 			v->child->begin_y = 3;
962 		} else if (v->child->begin_y > LINES - 1) {
963 			view->count = 0;
964 			v->child->begin_y = LINES - 1;
965 		}
966 		v->ncols = COLS;
967 		v->child->ncols = COLS;
968 		err = view_init_hsplit(v, v->child->begin_y);
969 		if (err)
970 			return err;
971 		v->child->resized_y = v->child->begin_y;
972 	} else {
973 		if (v->child->resized_x)
974 			v->child->begin_x = v->child->resized_x;
975 		if (view->parent)
976 			v->child->begin_x -= resize;
977 		else
978 			v->child->begin_x += resize;
979 		if (v->child->begin_x < 11) {
980 			view->count = 0;
981 			v->child->begin_x = 11;
982 		} else if (v->child->begin_x > COLS - 1) {
983 			view->count = 0;
984 			v->child->begin_x = COLS - 1;
985 		}
986 		v->child->resized_x = v->child->begin_x;
987 	}
988 
989 	v->child->mode = v->mode;
990 	v->child->nlines = v->lines - v->child->begin_y;
991 	v->child->ncols = v->cols - v->child->begin_x;
992 	v->focus_child = 1;
993 
994 	err = view_fullscreen(v);
995 	if (err)
996 		return err;
997 	err = view_splitscreen(v->child);
998 	if (err)
999 		return err;
1000 
1001 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1002 		err = offset_selection_down(v->child);
1003 		if (err)
1004 			return err;
1005 	}
1006 
1007 	if (v->type == TOG_VIEW_LOG)
1008 		err = request_log_commits(v);
1009 	else if (v->child->type == TOG_VIEW_LOG)
1010 		err = request_log_commits(v->child);
1011 
1012 	v->resize = v->child->resize = 0;
1013 
1014 	return err;
1015 }
1016 
1017 static void
1018 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1019 {
1020 	struct tog_view *v = src->child ? src->child : src;
1021 
1022 	dst->resized_x = v->resized_x;
1023 	dst->resized_y = v->resized_y;
1024 }
1025 
1026 static const struct got_error *
1027 view_close_child(struct tog_view *view)
1028 {
1029 	const struct got_error *err = NULL;
1030 
1031 	if (view->child == NULL)
1032 		return NULL;
1033 
1034 	err = view_close(view->child);
1035 	view->child = NULL;
1036 	return err;
1037 }
1038 
1039 static const struct got_error *
1040 view_set_child(struct tog_view *view, struct tog_view *child)
1041 {
1042 	const struct got_error *err = NULL;
1043 
1044 	view->child = child;
1045 	child->parent = view;
1046 
1047 	err = view_resize(view);
1048 	if (err)
1049 		return err;
1050 
1051 	if (view->child->resized_x || view->child->resized_y)
1052 		err = view_resize_split(view, 0);
1053 
1054 	return err;
1055 }
1056 
1057 static void
1058 tog_resizeterm(void)
1059 {
1060 	int cols, lines;
1061 	struct winsize size;
1062 
1063 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1064 		cols = 80;     /* Default */
1065 		lines = 24;
1066 	} else {
1067 		cols = size.ws_col;
1068 		lines = size.ws_row;
1069 	}
1070 	resize_term(lines, cols);
1071 }
1072 
1073 static const struct got_error *
1074 view_search_start(struct tog_view *view)
1075 {
1076 	const struct got_error *err = NULL;
1077 	struct tog_view *v = view;
1078 	char pattern[1024];
1079 	int ret;
1080 
1081 	if (view->search_started) {
1082 		regfree(&view->regex);
1083 		view->searching = 0;
1084 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1085 	}
1086 	view->search_started = 0;
1087 
1088 	if (view->nlines < 1)
1089 		return NULL;
1090 
1091 	if (view_is_hsplit_top(view))
1092 		v = view->child;
1093 
1094 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1095 	wclrtoeol(v->window);
1096 
1097 	nodelay(view->window, FALSE);  /* block for search term input */
1098 	nocbreak();
1099 	echo();
1100 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1101 	wrefresh(v->window);
1102 	cbreak();
1103 	noecho();
1104 	nodelay(view->window, TRUE);
1105 	if (ret == ERR)
1106 		return NULL;
1107 
1108 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1109 		err = view->search_start(view);
1110 		if (err) {
1111 			regfree(&view->regex);
1112 			return err;
1113 		}
1114 		view->search_started = 1;
1115 		view->searching = TOG_SEARCH_FORWARD;
1116 		view->search_next_done = 0;
1117 		view->search_next(view);
1118 	}
1119 
1120 	return NULL;
1121 }
1122 
1123 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1124 static const struct got_error *
1125 switch_split(struct tog_view *view)
1126 {
1127 	const struct got_error	*err = NULL;
1128 	struct tog_view		*v = NULL;
1129 
1130 	if (view->parent)
1131 		v = view->parent;
1132 	else
1133 		v = view;
1134 
1135 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1136 		v->mode = TOG_VIEW_SPLIT_VERT;
1137 	else
1138 		v->mode = TOG_VIEW_SPLIT_HRZN;
1139 
1140 	if (!v->child)
1141 		return NULL;
1142 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1143 		v->mode = TOG_VIEW_SPLIT_NONE;
1144 
1145 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1146 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1147 		v->child->begin_y = v->child->resized_y;
1148 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1149 		v->child->begin_x = v->child->resized_x;
1150 
1151 
1152 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1153 		v->ncols = COLS;
1154 		v->child->ncols = COLS;
1155 		v->child->nscrolled = LINES - v->child->nlines;
1156 
1157 		err = view_init_hsplit(v, v->child->begin_y);
1158 		if (err)
1159 			return err;
1160 	}
1161 	v->child->mode = v->mode;
1162 	v->child->nlines = v->lines - v->child->begin_y;
1163 	v->focus_child = 1;
1164 
1165 	err = view_fullscreen(v);
1166 	if (err)
1167 		return err;
1168 	err = view_splitscreen(v->child);
1169 	if (err)
1170 		return err;
1171 
1172 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1173 		v->mode = TOG_VIEW_SPLIT_VERT;
1174 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1175 		err = offset_selection_down(v);
1176 		err = offset_selection_down(v->child);
1177 	} else {
1178 		offset_selection_up(v);
1179 		offset_selection_up(v->child);
1180 	}
1181 	if (v->type == TOG_VIEW_LOG)
1182 		err = request_log_commits(v);
1183 	else if (v->child->type == TOG_VIEW_LOG)
1184 		err = request_log_commits(v->child);
1185 
1186 	return err;
1187 }
1188 
1189 /*
1190  * Compute view->count from numeric input. Assign total to view->count and
1191  * return first non-numeric key entered.
1192  */
1193 static int
1194 get_compound_key(struct tog_view *view, int c)
1195 {
1196 	struct tog_view	*v = view;
1197 	int		 x, n = 0;
1198 
1199 	if (view_is_hsplit_top(view))
1200 		v = view->child;
1201 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1202 		v = view->parent;
1203 
1204 	view->count = 0;
1205 	cbreak();  /* block for input */
1206 	wmove(v->window, v->nlines - 1, 0);
1207 	wclrtoeol(v->window);
1208 	waddch(v->window, ':');
1209 
1210 	do {
1211 		x = getcurx(v->window);
1212 		if (x != ERR && x < view->ncols) {
1213 			waddch(v->window, c);
1214 			wrefresh(v->window);
1215 		}
1216 
1217 		/*
1218 		 * Don't overflow. Max valid request should be the greatest
1219 		 * between the longest and total lines; cap at 10 million.
1220 		 */
1221 		if (n >= 9999999)
1222 			n = 9999999;
1223 		else
1224 			n = n * 10 + (c - '0');
1225 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1226 
1227 	/* Massage excessive or inapplicable values at the input handler. */
1228 	view->count = n;
1229 
1230 	return c;
1231 }
1232 
1233 static const struct got_error *
1234 view_input(struct tog_view **new, int *done, struct tog_view *view,
1235     struct tog_view_list_head *views)
1236 {
1237 	const struct got_error *err = NULL;
1238 	struct tog_view *v;
1239 	int ch, errcode;
1240 
1241 	*new = NULL;
1242 
1243 	/* Clear "no matches" indicator. */
1244 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1245 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1246 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1247 		view->count = 0;
1248 	}
1249 
1250 	if (view->searching && !view->search_next_done) {
1251 		errcode = pthread_mutex_unlock(&tog_mutex);
1252 		if (errcode)
1253 			return got_error_set_errno(errcode,
1254 			    "pthread_mutex_unlock");
1255 		sched_yield();
1256 		errcode = pthread_mutex_lock(&tog_mutex);
1257 		if (errcode)
1258 			return got_error_set_errno(errcode,
1259 			    "pthread_mutex_lock");
1260 		view->search_next(view);
1261 		return NULL;
1262 	}
1263 
1264 	nodelay(view->window, FALSE);
1265 	/* Allow threads to make progress while we are waiting for input. */
1266 	errcode = pthread_mutex_unlock(&tog_mutex);
1267 	if (errcode)
1268 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1269 	/* If we have an unfinished count, let C-g or backspace abort. */
1270 	if (view->count && --view->count) {
1271 		cbreak();
1272 		nodelay(view->window, TRUE);
1273 		ch = wgetch(view->window);
1274 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1275 			view->count = 0;
1276 		else
1277 			ch = view->ch;
1278 	} else {
1279 		ch = wgetch(view->window);
1280 		if (ch >= '1' && ch  <= '9')
1281 			view->ch = ch = get_compound_key(view, ch);
1282 	}
1283 	errcode = pthread_mutex_lock(&tog_mutex);
1284 	if (errcode)
1285 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1286 	nodelay(view->window, TRUE);
1287 
1288 	if (tog_sigwinch_received || tog_sigcont_received) {
1289 		tog_resizeterm();
1290 		tog_sigwinch_received = 0;
1291 		tog_sigcont_received = 0;
1292 		TAILQ_FOREACH(v, views, entry) {
1293 			err = view_resize(v);
1294 			if (err)
1295 				return err;
1296 			err = v->input(new, v, KEY_RESIZE);
1297 			if (err)
1298 				return err;
1299 			if (v->child) {
1300 				err = view_resize(v->child);
1301 				if (err)
1302 					return err;
1303 				err = v->child->input(new, v->child,
1304 				    KEY_RESIZE);
1305 				if (err)
1306 					return err;
1307 				if (v->child->resized_x || v->child->resized_y) {
1308 					err = view_resize_split(v, 0);
1309 					if (err)
1310 						return err;
1311 				}
1312 			}
1313 		}
1314 	}
1315 
1316 	switch (ch) {
1317 	case '\t':
1318 		view->count = 0;
1319 		if (view->child) {
1320 			view->focussed = 0;
1321 			view->child->focussed = 1;
1322 			view->focus_child = 1;
1323 		} else if (view->parent) {
1324 			view->focussed = 0;
1325 			view->parent->focussed = 1;
1326 			view->parent->focus_child = 0;
1327 			if (!view_is_splitscreen(view)) {
1328 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1329 				    view->parent->type == TOG_VIEW_LOG) {
1330 					err = request_log_commits(view->parent);
1331 					if (err)
1332 						return err;
1333 				}
1334 				offset_selection_up(view->parent);
1335 				err = view_fullscreen(view->parent);
1336 				if (err)
1337 					return err;
1338 			}
1339 		}
1340 		break;
1341 	case 'q':
1342 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1343 			if (view->parent->type == TOG_VIEW_LOG) {
1344 				/* might need more commits to fill fullscreen */
1345 				err = request_log_commits(view->parent);
1346 				if (err)
1347 					break;
1348 			}
1349 			offset_selection_up(view->parent);
1350 		}
1351 		err = view->input(new, view, ch);
1352 		view->dying = 1;
1353 		break;
1354 	case 'Q':
1355 		*done = 1;
1356 		break;
1357 	case 'F':
1358 		view->count = 0;
1359 		if (view_is_parent_view(view)) {
1360 			if (view->child == NULL)
1361 				break;
1362 			if (view_is_splitscreen(view->child)) {
1363 				view->focussed = 0;
1364 				view->child->focussed = 1;
1365 				err = view_fullscreen(view->child);
1366 			} else {
1367 				err = view_splitscreen(view->child);
1368 				if (!err)
1369 					err = view_resize_split(view, 0);
1370 			}
1371 			if (err)
1372 				break;
1373 			err = view->child->input(new, view->child,
1374 			    KEY_RESIZE);
1375 		} else {
1376 			if (view_is_splitscreen(view)) {
1377 				view->parent->focussed = 0;
1378 				view->focussed = 1;
1379 				err = view_fullscreen(view);
1380 			} else {
1381 				err = view_splitscreen(view);
1382 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1383 					err = view_resize(view->parent);
1384 				if (!err)
1385 					err = view_resize_split(view, 0);
1386 			}
1387 			if (err)
1388 				break;
1389 			err = view->input(new, view, KEY_RESIZE);
1390 		}
1391 		if (err)
1392 			break;
1393 		if (view->type == TOG_VIEW_LOG) {
1394 			err = request_log_commits(view);
1395 			if (err)
1396 				break;
1397 		}
1398 		if (view->parent)
1399 			err = offset_selection_down(view->parent);
1400 		if (!err)
1401 			err = offset_selection_down(view);
1402 		break;
1403 	case 'S':
1404 		view->count = 0;
1405 		err = switch_split(view);
1406 		break;
1407 	case '-':
1408 		err = view_resize_split(view, -1);
1409 		break;
1410 	case '+':
1411 		err = view_resize_split(view, 1);
1412 		break;
1413 	case KEY_RESIZE:
1414 		break;
1415 	case '/':
1416 		view->count = 0;
1417 		if (view->search_start)
1418 			view_search_start(view);
1419 		else
1420 			err = view->input(new, view, ch);
1421 		break;
1422 	case 'N':
1423 	case 'n':
1424 		if (view->search_started && view->search_next) {
1425 			view->searching = (ch == 'n' ?
1426 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1427 			view->search_next_done = 0;
1428 			view->search_next(view);
1429 		} else
1430 			err = view->input(new, view, ch);
1431 		break;
1432 	case 'A':
1433 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1434 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1435 		else
1436 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1437 		TAILQ_FOREACH(v, views, entry) {
1438 			if (v->reset) {
1439 				err = v->reset(v);
1440 				if (err)
1441 					return err;
1442 			}
1443 			if (v->child && v->child->reset) {
1444 				err = v->child->reset(v->child);
1445 				if (err)
1446 					return err;
1447 			}
1448 		}
1449 		break;
1450 	default:
1451 		err = view->input(new, view, ch);
1452 		break;
1453 	}
1454 
1455 	return err;
1456 }
1457 
1458 static int
1459 view_needs_focus_indication(struct tog_view *view)
1460 {
1461 	if (view_is_parent_view(view)) {
1462 		if (view->child == NULL || view->child->focussed)
1463 			return 0;
1464 		if (!view_is_splitscreen(view->child))
1465 			return 0;
1466 	} else if (!view_is_splitscreen(view))
1467 		return 0;
1468 
1469 	return view->focussed;
1470 }
1471 
1472 static const struct got_error *
1473 view_loop(struct tog_view *view)
1474 {
1475 	const struct got_error *err = NULL;
1476 	struct tog_view_list_head views;
1477 	struct tog_view *new_view;
1478 	char *mode;
1479 	int fast_refresh = 10;
1480 	int done = 0, errcode;
1481 
1482 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1483 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1484 		view->mode = TOG_VIEW_SPLIT_VERT;
1485 	else
1486 		view->mode = TOG_VIEW_SPLIT_HRZN;
1487 
1488 	errcode = pthread_mutex_lock(&tog_mutex);
1489 	if (errcode)
1490 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1491 
1492 	TAILQ_INIT(&views);
1493 	TAILQ_INSERT_HEAD(&views, view, entry);
1494 
1495 	view->focussed = 1;
1496 	err = view->show(view);
1497 	if (err)
1498 		return err;
1499 	update_panels();
1500 	doupdate();
1501 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1502 	    !tog_fatal_signal_received()) {
1503 		/* Refresh fast during initialization, then become slower. */
1504 		if (fast_refresh && fast_refresh-- == 0)
1505 			halfdelay(10); /* switch to once per second */
1506 
1507 		err = view_input(&new_view, &done, view, &views);
1508 		if (err)
1509 			break;
1510 		if (view->dying) {
1511 			struct tog_view *v, *prev = NULL;
1512 
1513 			if (view_is_parent_view(view))
1514 				prev = TAILQ_PREV(view, tog_view_list_head,
1515 				    entry);
1516 			else if (view->parent)
1517 				prev = view->parent;
1518 
1519 			if (view->parent) {
1520 				view->parent->child = NULL;
1521 				view->parent->focus_child = 0;
1522 				/* Restore fullscreen line height. */
1523 				view->parent->nlines = view->parent->lines;
1524 				err = view_resize(view->parent);
1525 				if (err)
1526 					break;
1527 				/* Make resized splits persist. */
1528 				view_transfer_size(view->parent, view);
1529 			} else
1530 				TAILQ_REMOVE(&views, view, entry);
1531 
1532 			err = view_close(view);
1533 			if (err)
1534 				goto done;
1535 
1536 			view = NULL;
1537 			TAILQ_FOREACH(v, &views, entry) {
1538 				if (v->focussed)
1539 					break;
1540 			}
1541 			if (view == NULL && new_view == NULL) {
1542 				/* No view has focus. Try to pick one. */
1543 				if (prev)
1544 					view = prev;
1545 				else if (!TAILQ_EMPTY(&views)) {
1546 					view = TAILQ_LAST(&views,
1547 					    tog_view_list_head);
1548 				}
1549 				if (view) {
1550 					if (view->focus_child) {
1551 						view->child->focussed = 1;
1552 						view = view->child;
1553 					} else
1554 						view->focussed = 1;
1555 				}
1556 			}
1557 		}
1558 		if (new_view) {
1559 			struct tog_view *v, *t;
1560 			/* Only allow one parent view per type. */
1561 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1562 				if (v->type != new_view->type)
1563 					continue;
1564 				TAILQ_REMOVE(&views, v, entry);
1565 				err = view_close(v);
1566 				if (err)
1567 					goto done;
1568 				break;
1569 			}
1570 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1571 			view = new_view;
1572 		}
1573 		if (view) {
1574 			if (view_is_parent_view(view)) {
1575 				if (view->child && view->child->focussed)
1576 					view = view->child;
1577 			} else {
1578 				if (view->parent && view->parent->focussed)
1579 					view = view->parent;
1580 			}
1581 			show_panel(view->panel);
1582 			if (view->child && view_is_splitscreen(view->child))
1583 				show_panel(view->child->panel);
1584 			if (view->parent && view_is_splitscreen(view)) {
1585 				err = view->parent->show(view->parent);
1586 				if (err)
1587 					goto done;
1588 			}
1589 			err = view->show(view);
1590 			if (err)
1591 				goto done;
1592 			if (view->child) {
1593 				err = view->child->show(view->child);
1594 				if (err)
1595 					goto done;
1596 			}
1597 			update_panels();
1598 			doupdate();
1599 		}
1600 	}
1601 done:
1602 	while (!TAILQ_EMPTY(&views)) {
1603 		const struct got_error *close_err;
1604 		view = TAILQ_FIRST(&views);
1605 		TAILQ_REMOVE(&views, view, entry);
1606 		close_err = view_close(view);
1607 		if (close_err && err == NULL)
1608 			err = close_err;
1609 	}
1610 
1611 	errcode = pthread_mutex_unlock(&tog_mutex);
1612 	if (errcode && err == NULL)
1613 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1614 
1615 	return err;
1616 }
1617 
1618 __dead static void
1619 usage_log(void)
1620 {
1621 	endwin();
1622 	fprintf(stderr,
1623 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1624 	    getprogname());
1625 	exit(1);
1626 }
1627 
1628 /* Create newly allocated wide-character string equivalent to a byte string. */
1629 static const struct got_error *
1630 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1631 {
1632 	char *vis = NULL;
1633 	const struct got_error *err = NULL;
1634 
1635 	*ws = NULL;
1636 	*wlen = mbstowcs(NULL, s, 0);
1637 	if (*wlen == (size_t)-1) {
1638 		int vislen;
1639 		if (errno != EILSEQ)
1640 			return got_error_from_errno("mbstowcs");
1641 
1642 		/* byte string invalid in current encoding; try to "fix" it */
1643 		err = got_mbsavis(&vis, &vislen, s);
1644 		if (err)
1645 			return err;
1646 		*wlen = mbstowcs(NULL, vis, 0);
1647 		if (*wlen == (size_t)-1) {
1648 			err = got_error_from_errno("mbstowcs"); /* give up */
1649 			goto done;
1650 		}
1651 	}
1652 
1653 	*ws = calloc(*wlen + 1, sizeof(**ws));
1654 	if (*ws == NULL) {
1655 		err = got_error_from_errno("calloc");
1656 		goto done;
1657 	}
1658 
1659 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1660 		err = got_error_from_errno("mbstowcs");
1661 done:
1662 	free(vis);
1663 	if (err) {
1664 		free(*ws);
1665 		*ws = NULL;
1666 		*wlen = 0;
1667 	}
1668 	return err;
1669 }
1670 
1671 static const struct got_error *
1672 expand_tab(char **ptr, const char *src)
1673 {
1674 	char	*dst;
1675 	size_t	 len, n, idx = 0, sz = 0;
1676 
1677 	*ptr = NULL;
1678 	n = len = strlen(src);
1679 	dst = malloc(n + 1);
1680 	if (dst == NULL)
1681 		return got_error_from_errno("malloc");
1682 
1683 	while (idx < len && src[idx]) {
1684 		const char c = src[idx];
1685 
1686 		if (c == '\t') {
1687 			size_t nb = TABSIZE - sz % TABSIZE;
1688 			char *p;
1689 
1690 			p = realloc(dst, n + nb);
1691 			if (p == NULL) {
1692 				free(dst);
1693 				return got_error_from_errno("realloc");
1694 
1695 			}
1696 			dst = p;
1697 			n += nb;
1698 			memset(dst + sz, ' ', nb);
1699 			sz += nb;
1700 		} else
1701 			dst[sz++] = src[idx];
1702 		++idx;
1703 	}
1704 
1705 	dst[sz] = '\0';
1706 	*ptr = dst;
1707 	return NULL;
1708 }
1709 
1710 /*
1711  * Advance at most n columns from wline starting at offset off.
1712  * Return the index to the first character after the span operation.
1713  * Return the combined column width of all spanned wide character in
1714  * *rcol.
1715  */
1716 static int
1717 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1718 {
1719 	int width, i, cols = 0;
1720 
1721 	if (n == 0) {
1722 		*rcol = cols;
1723 		return off;
1724 	}
1725 
1726 	for (i = off; wline[i] != L'\0'; ++i) {
1727 		if (wline[i] == L'\t')
1728 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1729 		else
1730 			width = wcwidth(wline[i]);
1731 
1732 		if (width == -1) {
1733 			width = 1;
1734 			wline[i] = L'.';
1735 		}
1736 
1737 		if (cols + width > n)
1738 			break;
1739 		cols += width;
1740 	}
1741 
1742 	*rcol = cols;
1743 	return i;
1744 }
1745 
1746 /*
1747  * Format a line for display, ensuring that it won't overflow a width limit.
1748  * With scrolling, the width returned refers to the scrolled version of the
1749  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1750  */
1751 static const struct got_error *
1752 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1753     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1754 {
1755 	const struct got_error *err = NULL;
1756 	int cols;
1757 	wchar_t *wline = NULL;
1758 	char *exstr = NULL;
1759 	size_t wlen;
1760 	int i, scrollx;
1761 
1762 	*wlinep = NULL;
1763 	*widthp = 0;
1764 
1765 	if (expand) {
1766 		err = expand_tab(&exstr, line);
1767 		if (err)
1768 			return err;
1769 	}
1770 
1771 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1772 	free(exstr);
1773 	if (err)
1774 		return err;
1775 
1776 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1777 
1778 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1779 		wline[wlen - 1] = L'\0';
1780 		wlen--;
1781 	}
1782 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1783 		wline[wlen - 1] = L'\0';
1784 		wlen--;
1785 	}
1786 
1787 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1788 	wline[i] = L'\0';
1789 
1790 	if (widthp)
1791 		*widthp = cols;
1792 	if (scrollxp)
1793 		*scrollxp = scrollx;
1794 	if (err)
1795 		free(wline);
1796 	else
1797 		*wlinep = wline;
1798 	return err;
1799 }
1800 
1801 static const struct got_error*
1802 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1803     struct got_object_id *id, struct got_repository *repo)
1804 {
1805 	static const struct got_error *err = NULL;
1806 	struct got_reflist_entry *re;
1807 	char *s;
1808 	const char *name;
1809 
1810 	*refs_str = NULL;
1811 
1812 	TAILQ_FOREACH(re, refs, entry) {
1813 		struct got_tag_object *tag = NULL;
1814 		struct got_object_id *ref_id;
1815 		int cmp;
1816 
1817 		name = got_ref_get_name(re->ref);
1818 		if (strcmp(name, GOT_REF_HEAD) == 0)
1819 			continue;
1820 		if (strncmp(name, "refs/", 5) == 0)
1821 			name += 5;
1822 		if (strncmp(name, "got/", 4) == 0 &&
1823 		    strncmp(name, "got/backup/", 11) != 0)
1824 			continue;
1825 		if (strncmp(name, "heads/", 6) == 0)
1826 			name += 6;
1827 		if (strncmp(name, "remotes/", 8) == 0) {
1828 			name += 8;
1829 			s = strstr(name, "/" GOT_REF_HEAD);
1830 			if (s != NULL && s[strlen(s)] == '\0')
1831 				continue;
1832 		}
1833 		err = got_ref_resolve(&ref_id, repo, re->ref);
1834 		if (err)
1835 			break;
1836 		if (strncmp(name, "tags/", 5) == 0) {
1837 			err = got_object_open_as_tag(&tag, repo, ref_id);
1838 			if (err) {
1839 				if (err->code != GOT_ERR_OBJ_TYPE) {
1840 					free(ref_id);
1841 					break;
1842 				}
1843 				/* Ref points at something other than a tag. */
1844 				err = NULL;
1845 				tag = NULL;
1846 			}
1847 		}
1848 		cmp = got_object_id_cmp(tag ?
1849 		    got_object_tag_get_object_id(tag) : ref_id, id);
1850 		free(ref_id);
1851 		if (tag)
1852 			got_object_tag_close(tag);
1853 		if (cmp != 0)
1854 			continue;
1855 		s = *refs_str;
1856 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1857 		    s ? ", " : "", name) == -1) {
1858 			err = got_error_from_errno("asprintf");
1859 			free(s);
1860 			*refs_str = NULL;
1861 			break;
1862 		}
1863 		free(s);
1864 	}
1865 
1866 	return err;
1867 }
1868 
1869 static const struct got_error *
1870 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1871     int col_tab_align)
1872 {
1873 	char *smallerthan;
1874 
1875 	smallerthan = strchr(author, '<');
1876 	if (smallerthan && smallerthan[1] != '\0')
1877 		author = smallerthan + 1;
1878 	author[strcspn(author, "@>")] = '\0';
1879 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1880 	    col_tab_align, 0);
1881 }
1882 
1883 static const struct got_error *
1884 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1885     struct got_object_id *id, const size_t date_display_cols,
1886     int author_display_cols)
1887 {
1888 	struct tog_log_view_state *s = &view->state.log;
1889 	const struct got_error *err = NULL;
1890 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1891 	char *logmsg0 = NULL, *logmsg = NULL;
1892 	char *author = NULL;
1893 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1894 	int author_width, logmsg_width;
1895 	char *newline, *line = NULL;
1896 	int col, limit, scrollx;
1897 	const int avail = view->ncols;
1898 	struct tm tm;
1899 	time_t committer_time;
1900 	struct tog_color *tc;
1901 
1902 	committer_time = got_object_commit_get_committer_time(commit);
1903 	if (gmtime_r(&committer_time, &tm) == NULL)
1904 		return got_error_from_errno("gmtime_r");
1905 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1906 		return got_error(GOT_ERR_NO_SPACE);
1907 
1908 	if (avail <= date_display_cols)
1909 		limit = MIN(sizeof(datebuf) - 1, avail);
1910 	else
1911 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1912 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1913 	if (tc)
1914 		wattr_on(view->window,
1915 		    COLOR_PAIR(tc->colorpair), NULL);
1916 	waddnstr(view->window, datebuf, limit);
1917 	if (tc)
1918 		wattr_off(view->window,
1919 		    COLOR_PAIR(tc->colorpair), NULL);
1920 	col = limit;
1921 	if (col > avail)
1922 		goto done;
1923 
1924 	if (avail >= 120) {
1925 		char *id_str;
1926 		err = got_object_id_str(&id_str, id);
1927 		if (err)
1928 			goto done;
1929 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1930 		if (tc)
1931 			wattr_on(view->window,
1932 			    COLOR_PAIR(tc->colorpair), NULL);
1933 		wprintw(view->window, "%.8s ", id_str);
1934 		if (tc)
1935 			wattr_off(view->window,
1936 			    COLOR_PAIR(tc->colorpair), NULL);
1937 		free(id_str);
1938 		col += 9;
1939 		if (col > avail)
1940 			goto done;
1941 	}
1942 
1943 	author = strdup(got_object_commit_get_author(commit));
1944 	if (author == NULL) {
1945 		err = got_error_from_errno("strdup");
1946 		goto done;
1947 	}
1948 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1949 	if (err)
1950 		goto done;
1951 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1952 	if (tc)
1953 		wattr_on(view->window,
1954 		    COLOR_PAIR(tc->colorpair), NULL);
1955 	waddwstr(view->window, wauthor);
1956 	if (tc)
1957 		wattr_off(view->window,
1958 		    COLOR_PAIR(tc->colorpair), NULL);
1959 	col += author_width;
1960 	while (col < avail && author_width < author_display_cols + 2) {
1961 		waddch(view->window, ' ');
1962 		col++;
1963 		author_width++;
1964 	}
1965 	if (col > avail)
1966 		goto done;
1967 
1968 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1969 	if (err)
1970 		goto done;
1971 	logmsg = logmsg0;
1972 	while (*logmsg == '\n')
1973 		logmsg++;
1974 	newline = strchr(logmsg, '\n');
1975 	if (newline)
1976 		*newline = '\0';
1977 	limit = avail - col;
1978 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
1979 		limit--;	/* for the border */
1980 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
1981 	    limit, col, 1);
1982 	if (err)
1983 		goto done;
1984 	waddwstr(view->window, &wlogmsg[scrollx]);
1985 	col += MAX(logmsg_width, 0);
1986 	while (col < avail) {
1987 		waddch(view->window, ' ');
1988 		col++;
1989 	}
1990 done:
1991 	free(logmsg0);
1992 	free(wlogmsg);
1993 	free(author);
1994 	free(wauthor);
1995 	free(line);
1996 	return err;
1997 }
1998 
1999 static struct commit_queue_entry *
2000 alloc_commit_queue_entry(struct got_commit_object *commit,
2001     struct got_object_id *id)
2002 {
2003 	struct commit_queue_entry *entry;
2004 
2005 	entry = calloc(1, sizeof(*entry));
2006 	if (entry == NULL)
2007 		return NULL;
2008 
2009 	entry->id = id;
2010 	entry->commit = commit;
2011 	return entry;
2012 }
2013 
2014 static void
2015 pop_commit(struct commit_queue *commits)
2016 {
2017 	struct commit_queue_entry *entry;
2018 
2019 	entry = TAILQ_FIRST(&commits->head);
2020 	TAILQ_REMOVE(&commits->head, entry, entry);
2021 	got_object_commit_close(entry->commit);
2022 	commits->ncommits--;
2023 	/* Don't free entry->id! It is owned by the commit graph. */
2024 	free(entry);
2025 }
2026 
2027 static void
2028 free_commits(struct commit_queue *commits)
2029 {
2030 	while (!TAILQ_EMPTY(&commits->head))
2031 		pop_commit(commits);
2032 }
2033 
2034 static const struct got_error *
2035 match_commit(int *have_match, struct got_object_id *id,
2036     struct got_commit_object *commit, regex_t *regex)
2037 {
2038 	const struct got_error *err = NULL;
2039 	regmatch_t regmatch;
2040 	char *id_str = NULL, *logmsg = NULL;
2041 
2042 	*have_match = 0;
2043 
2044 	err = got_object_id_str(&id_str, id);
2045 	if (err)
2046 		return err;
2047 
2048 	err = got_object_commit_get_logmsg(&logmsg, commit);
2049 	if (err)
2050 		goto done;
2051 
2052 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2053 	    &regmatch, 0) == 0 ||
2054 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2055 	    &regmatch, 0) == 0 ||
2056 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2057 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2058 		*have_match = 1;
2059 done:
2060 	free(id_str);
2061 	free(logmsg);
2062 	return err;
2063 }
2064 
2065 static const struct got_error *
2066 queue_commits(struct tog_log_thread_args *a)
2067 {
2068 	const struct got_error *err = NULL;
2069 
2070 	/*
2071 	 * We keep all commits open throughout the lifetime of the log
2072 	 * view in order to avoid having to re-fetch commits from disk
2073 	 * while updating the display.
2074 	 */
2075 	do {
2076 		struct got_object_id *id;
2077 		struct got_commit_object *commit;
2078 		struct commit_queue_entry *entry;
2079 		int errcode;
2080 
2081 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2082 		    NULL, NULL);
2083 		if (err || id == NULL)
2084 			break;
2085 
2086 		err = got_object_open_as_commit(&commit, a->repo, id);
2087 		if (err)
2088 			break;
2089 		entry = alloc_commit_queue_entry(commit, id);
2090 		if (entry == NULL) {
2091 			err = got_error_from_errno("alloc_commit_queue_entry");
2092 			break;
2093 		}
2094 
2095 		errcode = pthread_mutex_lock(&tog_mutex);
2096 		if (errcode) {
2097 			err = got_error_set_errno(errcode,
2098 			    "pthread_mutex_lock");
2099 			break;
2100 		}
2101 
2102 		entry->idx = a->commits->ncommits;
2103 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2104 		a->commits->ncommits++;
2105 
2106 		if (*a->searching == TOG_SEARCH_FORWARD &&
2107 		    !*a->search_next_done) {
2108 			int have_match;
2109 			err = match_commit(&have_match, id, commit, a->regex);
2110 			if (err)
2111 				break;
2112 			if (have_match)
2113 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2114 		}
2115 
2116 		errcode = pthread_mutex_unlock(&tog_mutex);
2117 		if (errcode && err == NULL)
2118 			err = got_error_set_errno(errcode,
2119 			    "pthread_mutex_unlock");
2120 		if (err)
2121 			break;
2122 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2123 
2124 	return err;
2125 }
2126 
2127 static void
2128 select_commit(struct tog_log_view_state *s)
2129 {
2130 	struct commit_queue_entry *entry;
2131 	int ncommits = 0;
2132 
2133 	entry = s->first_displayed_entry;
2134 	while (entry) {
2135 		if (ncommits == s->selected) {
2136 			s->selected_entry = entry;
2137 			break;
2138 		}
2139 		entry = TAILQ_NEXT(entry, entry);
2140 		ncommits++;
2141 	}
2142 }
2143 
2144 static const struct got_error *
2145 draw_commits(struct tog_view *view)
2146 {
2147 	const struct got_error *err = NULL;
2148 	struct tog_log_view_state *s = &view->state.log;
2149 	struct commit_queue_entry *entry = s->selected_entry;
2150 	const int limit = view->nlines;
2151 	int width;
2152 	int ncommits, author_cols = 4;
2153 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2154 	char *refs_str = NULL;
2155 	wchar_t *wline;
2156 	struct tog_color *tc;
2157 	static const size_t date_display_cols = 12;
2158 
2159 	if (s->selected_entry &&
2160 	    !(view->searching && view->search_next_done == 0)) {
2161 		struct got_reflist_head *refs;
2162 		err = got_object_id_str(&id_str, s->selected_entry->id);
2163 		if (err)
2164 			return err;
2165 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2166 		    s->selected_entry->id);
2167 		if (refs) {
2168 			err = build_refs_str(&refs_str, refs,
2169 			    s->selected_entry->id, s->repo);
2170 			if (err)
2171 				goto done;
2172 		}
2173 	}
2174 
2175 	if (s->thread_args.commits_needed == 0)
2176 		halfdelay(10); /* disable fast refresh */
2177 
2178 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2179 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2180 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2181 		    (view->searching && !view->search_next_done) ?
2182 		    "searching..." : "loading...") == -1) {
2183 			err = got_error_from_errno("asprintf");
2184 			goto done;
2185 		}
2186 	} else {
2187 		const char *search_str = NULL;
2188 
2189 		if (view->searching) {
2190 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2191 				search_str = "no more matches";
2192 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2193 				search_str = "no matches found";
2194 			else if (!view->search_next_done)
2195 				search_str = "searching...";
2196 		}
2197 
2198 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2199 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2200 		    search_str ? search_str :
2201 		    (refs_str ? refs_str : "")) == -1) {
2202 			err = got_error_from_errno("asprintf");
2203 			goto done;
2204 		}
2205 	}
2206 
2207 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2208 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2209 		    "........................................",
2210 		    s->in_repo_path, ncommits_str) == -1) {
2211 			err = got_error_from_errno("asprintf");
2212 			header = NULL;
2213 			goto done;
2214 		}
2215 	} else if (asprintf(&header, "commit %s%s",
2216 	    id_str ? id_str : "........................................",
2217 	    ncommits_str) == -1) {
2218 		err = got_error_from_errno("asprintf");
2219 		header = NULL;
2220 		goto done;
2221 	}
2222 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2223 	if (err)
2224 		goto done;
2225 
2226 	werase(view->window);
2227 
2228 	if (view_needs_focus_indication(view))
2229 		wstandout(view->window);
2230 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2231 	if (tc)
2232 		wattr_on(view->window,
2233 		    COLOR_PAIR(tc->colorpair), NULL);
2234 	waddwstr(view->window, wline);
2235 	if (tc)
2236 		wattr_off(view->window,
2237 		    COLOR_PAIR(tc->colorpair), NULL);
2238 	while (width < view->ncols) {
2239 		waddch(view->window, ' ');
2240 		width++;
2241 	}
2242 	if (view_needs_focus_indication(view))
2243 		wstandend(view->window);
2244 	free(wline);
2245 	if (limit <= 1)
2246 		goto done;
2247 
2248 	/* Grow author column size if necessary, and set view->maxx. */
2249 	entry = s->first_displayed_entry;
2250 	ncommits = 0;
2251 	view->maxx = 0;
2252 	while (entry) {
2253 		char *author, *eol, *msg, *msg0;
2254 		wchar_t *wauthor, *wmsg;
2255 		int width;
2256 		if (ncommits >= limit - 1)
2257 			break;
2258 		author = strdup(got_object_commit_get_author(entry->commit));
2259 		if (author == NULL) {
2260 			err = got_error_from_errno("strdup");
2261 			goto done;
2262 		}
2263 		err = format_author(&wauthor, &width, author, COLS,
2264 		    date_display_cols);
2265 		if (author_cols < width)
2266 			author_cols = width;
2267 		free(wauthor);
2268 		free(author);
2269 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
2270 		if (err)
2271 			goto done;
2272 		msg = msg0;
2273 		while (*msg == '\n')
2274 			++msg;
2275 		if ((eol = strchr(msg, '\n')))
2276 			*eol = '\0';
2277 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2278 		    date_display_cols + author_cols, 0);
2279 		if (err)
2280 			goto done;
2281 		view->maxx = MAX(view->maxx, width);
2282 		free(msg0);
2283 		free(wmsg);
2284 		ncommits++;
2285 		entry = TAILQ_NEXT(entry, entry);
2286 	}
2287 
2288 	entry = s->first_displayed_entry;
2289 	s->last_displayed_entry = s->first_displayed_entry;
2290 	ncommits = 0;
2291 	while (entry) {
2292 		if (ncommits >= limit - 1)
2293 			break;
2294 		if (ncommits == s->selected)
2295 			wstandout(view->window);
2296 		err = draw_commit(view, entry->commit, entry->id,
2297 		    date_display_cols, author_cols);
2298 		if (ncommits == s->selected)
2299 			wstandend(view->window);
2300 		if (err)
2301 			goto done;
2302 		ncommits++;
2303 		s->last_displayed_entry = entry;
2304 		entry = TAILQ_NEXT(entry, entry);
2305 	}
2306 
2307 	view_border(view);
2308 done:
2309 	free(id_str);
2310 	free(refs_str);
2311 	free(ncommits_str);
2312 	free(header);
2313 	return err;
2314 }
2315 
2316 static void
2317 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2318 {
2319 	struct commit_queue_entry *entry;
2320 	int nscrolled = 0;
2321 
2322 	entry = TAILQ_FIRST(&s->commits.head);
2323 	if (s->first_displayed_entry == entry)
2324 		return;
2325 
2326 	entry = s->first_displayed_entry;
2327 	while (entry && nscrolled < maxscroll) {
2328 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2329 		if (entry) {
2330 			s->first_displayed_entry = entry;
2331 			nscrolled++;
2332 		}
2333 	}
2334 }
2335 
2336 static const struct got_error *
2337 trigger_log_thread(struct tog_view *view, int wait)
2338 {
2339 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2340 	int errcode;
2341 
2342 	halfdelay(1); /* fast refresh while loading commits */
2343 
2344 	while (!ta->log_complete && !tog_thread_error &&
2345 	    (ta->commits_needed > 0 || ta->load_all)) {
2346 		/* Wake the log thread. */
2347 		errcode = pthread_cond_signal(&ta->need_commits);
2348 		if (errcode)
2349 			return got_error_set_errno(errcode,
2350 			    "pthread_cond_signal");
2351 
2352 		/*
2353 		 * The mutex will be released while the view loop waits
2354 		 * in wgetch(), at which time the log thread will run.
2355 		 */
2356 		if (!wait)
2357 			break;
2358 
2359 		/* Display progress update in log view. */
2360 		show_log_view(view);
2361 		update_panels();
2362 		doupdate();
2363 
2364 		/* Wait right here while next commit is being loaded. */
2365 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2366 		if (errcode)
2367 			return got_error_set_errno(errcode,
2368 			    "pthread_cond_wait");
2369 
2370 		/* Display progress update in log view. */
2371 		show_log_view(view);
2372 		update_panels();
2373 		doupdate();
2374 	}
2375 
2376 	return NULL;
2377 }
2378 
2379 static const struct got_error *
2380 request_log_commits(struct tog_view *view)
2381 {
2382 	struct tog_log_view_state	*state = &view->state.log;
2383 	const struct got_error		*err = NULL;
2384 
2385 	state->thread_args.commits_needed = view->nscrolled;
2386 	err = trigger_log_thread(view, 1);
2387 	view->nscrolled = 0;
2388 
2389 	return err;
2390 }
2391 
2392 static const struct got_error *
2393 log_scroll_down(struct tog_view *view, int maxscroll)
2394 {
2395 	struct tog_log_view_state *s = &view->state.log;
2396 	const struct got_error *err = NULL;
2397 	struct commit_queue_entry *pentry;
2398 	int nscrolled = 0, ncommits_needed;
2399 
2400 	if (s->last_displayed_entry == NULL)
2401 		return NULL;
2402 
2403 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2404 	if (s->commits.ncommits < ncommits_needed &&
2405 	    !s->thread_args.log_complete) {
2406 		/*
2407 		 * Ask the log thread for required amount of commits.
2408 		 */
2409 		s->thread_args.commits_needed += maxscroll;
2410 		err = trigger_log_thread(view, 1);
2411 		if (err)
2412 			return err;
2413 	}
2414 
2415 	do {
2416 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2417 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2418 			break;
2419 
2420 		s->last_displayed_entry = pentry ?
2421 		    pentry : s->last_displayed_entry;;
2422 
2423 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2424 		if (pentry == NULL)
2425 			break;
2426 		s->first_displayed_entry = pentry;
2427 	} while (++nscrolled < maxscroll);
2428 
2429 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
2430 		view->nscrolled += nscrolled;
2431 	else
2432 		view->nscrolled = 0;
2433 
2434 	return err;
2435 }
2436 
2437 static const struct got_error *
2438 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2439     struct got_commit_object *commit, struct got_object_id *commit_id,
2440     struct tog_view *log_view, struct got_repository *repo)
2441 {
2442 	const struct got_error *err;
2443 	struct got_object_qid *parent_id;
2444 	struct tog_view *diff_view;
2445 
2446 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2447 	if (diff_view == NULL)
2448 		return got_error_from_errno("view_open");
2449 
2450 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2451 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2452 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2453 	if (err == NULL)
2454 		*new_view = diff_view;
2455 	return err;
2456 }
2457 
2458 static const struct got_error *
2459 tree_view_visit_subtree(struct tog_tree_view_state *s,
2460     struct got_tree_object *subtree)
2461 {
2462 	struct tog_parent_tree *parent;
2463 
2464 	parent = calloc(1, sizeof(*parent));
2465 	if (parent == NULL)
2466 		return got_error_from_errno("calloc");
2467 
2468 	parent->tree = s->tree;
2469 	parent->first_displayed_entry = s->first_displayed_entry;
2470 	parent->selected_entry = s->selected_entry;
2471 	parent->selected = s->selected;
2472 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2473 	s->tree = subtree;
2474 	s->selected = 0;
2475 	s->first_displayed_entry = NULL;
2476 	return NULL;
2477 }
2478 
2479 static const struct got_error *
2480 tree_view_walk_path(struct tog_tree_view_state *s,
2481     struct got_commit_object *commit, const char *path)
2482 {
2483 	const struct got_error *err = NULL;
2484 	struct got_tree_object *tree = NULL;
2485 	const char *p;
2486 	char *slash, *subpath = NULL;
2487 
2488 	/* Walk the path and open corresponding tree objects. */
2489 	p = path;
2490 	while (*p) {
2491 		struct got_tree_entry *te;
2492 		struct got_object_id *tree_id;
2493 		char *te_name;
2494 
2495 		while (p[0] == '/')
2496 			p++;
2497 
2498 		/* Ensure the correct subtree entry is selected. */
2499 		slash = strchr(p, '/');
2500 		if (slash == NULL)
2501 			te_name = strdup(p);
2502 		else
2503 			te_name = strndup(p, slash - p);
2504 		if (te_name == NULL) {
2505 			err = got_error_from_errno("strndup");
2506 			break;
2507 		}
2508 		te = got_object_tree_find_entry(s->tree, te_name);
2509 		if (te == NULL) {
2510 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2511 			free(te_name);
2512 			break;
2513 		}
2514 		free(te_name);
2515 		s->first_displayed_entry = s->selected_entry = te;
2516 
2517 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2518 			break; /* jump to this file's entry */
2519 
2520 		slash = strchr(p, '/');
2521 		if (slash)
2522 			subpath = strndup(path, slash - path);
2523 		else
2524 			subpath = strdup(path);
2525 		if (subpath == NULL) {
2526 			err = got_error_from_errno("strdup");
2527 			break;
2528 		}
2529 
2530 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2531 		    subpath);
2532 		if (err)
2533 			break;
2534 
2535 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2536 		free(tree_id);
2537 		if (err)
2538 			break;
2539 
2540 		err = tree_view_visit_subtree(s, tree);
2541 		if (err) {
2542 			got_object_tree_close(tree);
2543 			break;
2544 		}
2545 		if (slash == NULL)
2546 			break;
2547 		free(subpath);
2548 		subpath = NULL;
2549 		p = slash;
2550 	}
2551 
2552 	free(subpath);
2553 	return err;
2554 }
2555 
2556 static const struct got_error *
2557 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2558     struct commit_queue_entry *entry, const char *path,
2559     const char *head_ref_name, struct got_repository *repo)
2560 {
2561 	const struct got_error *err = NULL;
2562 	struct tog_tree_view_state *s;
2563 	struct tog_view *tree_view;
2564 
2565 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2566 	if (tree_view == NULL)
2567 		return got_error_from_errno("view_open");
2568 
2569 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2570 	if (err)
2571 		return err;
2572 	s = &tree_view->state.tree;
2573 
2574 	*new_view = tree_view;
2575 
2576 	if (got_path_is_root_dir(path))
2577 		return NULL;
2578 
2579 	return tree_view_walk_path(s, entry->commit, path);
2580 }
2581 
2582 static const struct got_error *
2583 block_signals_used_by_main_thread(void)
2584 {
2585 	sigset_t sigset;
2586 	int errcode;
2587 
2588 	if (sigemptyset(&sigset) == -1)
2589 		return got_error_from_errno("sigemptyset");
2590 
2591 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2592 	if (sigaddset(&sigset, SIGWINCH) == -1)
2593 		return got_error_from_errno("sigaddset");
2594 	if (sigaddset(&sigset, SIGCONT) == -1)
2595 		return got_error_from_errno("sigaddset");
2596 	if (sigaddset(&sigset, SIGINT) == -1)
2597 		return got_error_from_errno("sigaddset");
2598 	if (sigaddset(&sigset, SIGTERM) == -1)
2599 		return got_error_from_errno("sigaddset");
2600 
2601 	/* ncurses handles SIGTSTP */
2602 	if (sigaddset(&sigset, SIGTSTP) == -1)
2603 		return got_error_from_errno("sigaddset");
2604 
2605 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2606 	if (errcode)
2607 		return got_error_set_errno(errcode, "pthread_sigmask");
2608 
2609 	return NULL;
2610 }
2611 
2612 static void *
2613 log_thread(void *arg)
2614 {
2615 	const struct got_error *err = NULL;
2616 	int errcode = 0;
2617 	struct tog_log_thread_args *a = arg;
2618 	int done = 0;
2619 
2620 	/*
2621 	 * Sync startup with main thread such that we begin our
2622 	 * work once view_input() has released the mutex.
2623 	 */
2624 	errcode = pthread_mutex_lock(&tog_mutex);
2625 	if (errcode) {
2626 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2627 		return (void *)err;
2628 	}
2629 
2630 	err = block_signals_used_by_main_thread();
2631 	if (err) {
2632 		pthread_mutex_unlock(&tog_mutex);
2633 		goto done;
2634 	}
2635 
2636 	while (!done && !err && !tog_fatal_signal_received()) {
2637 		errcode = pthread_mutex_unlock(&tog_mutex);
2638 		if (errcode) {
2639 			err = got_error_set_errno(errcode,
2640 			    "pthread_mutex_unlock");
2641 			goto done;
2642 		}
2643 		err = queue_commits(a);
2644 		if (err) {
2645 			if (err->code != GOT_ERR_ITER_COMPLETED)
2646 				goto done;
2647 			err = NULL;
2648 			done = 1;
2649 		} else if (a->commits_needed > 0 && !a->load_all)
2650 			a->commits_needed--;
2651 
2652 		errcode = pthread_mutex_lock(&tog_mutex);
2653 		if (errcode) {
2654 			err = got_error_set_errno(errcode,
2655 			    "pthread_mutex_lock");
2656 			goto done;
2657 		} else if (*a->quit)
2658 			done = 1;
2659 		else if (*a->first_displayed_entry == NULL) {
2660 			*a->first_displayed_entry =
2661 			    TAILQ_FIRST(&a->commits->head);
2662 			*a->selected_entry = *a->first_displayed_entry;
2663 		}
2664 
2665 		errcode = pthread_cond_signal(&a->commit_loaded);
2666 		if (errcode) {
2667 			err = got_error_set_errno(errcode,
2668 			    "pthread_cond_signal");
2669 			pthread_mutex_unlock(&tog_mutex);
2670 			goto done;
2671 		}
2672 
2673 		if (done)
2674 			a->commits_needed = 0;
2675 		else {
2676 			if (a->commits_needed == 0 && !a->load_all) {
2677 				errcode = pthread_cond_wait(&a->need_commits,
2678 				    &tog_mutex);
2679 				if (errcode) {
2680 					err = got_error_set_errno(errcode,
2681 					    "pthread_cond_wait");
2682 					pthread_mutex_unlock(&tog_mutex);
2683 					goto done;
2684 				}
2685 				if (*a->quit)
2686 					done = 1;
2687 			}
2688 		}
2689 	}
2690 	a->log_complete = 1;
2691 	errcode = pthread_mutex_unlock(&tog_mutex);
2692 	if (errcode)
2693 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2694 done:
2695 	if (err) {
2696 		tog_thread_error = 1;
2697 		pthread_cond_signal(&a->commit_loaded);
2698 	}
2699 	return (void *)err;
2700 }
2701 
2702 static const struct got_error *
2703 stop_log_thread(struct tog_log_view_state *s)
2704 {
2705 	const struct got_error *err = NULL, *thread_err = NULL;
2706 	int errcode;
2707 
2708 	if (s->thread) {
2709 		s->quit = 1;
2710 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2711 		if (errcode)
2712 			return got_error_set_errno(errcode,
2713 			    "pthread_cond_signal");
2714 		errcode = pthread_mutex_unlock(&tog_mutex);
2715 		if (errcode)
2716 			return got_error_set_errno(errcode,
2717 			    "pthread_mutex_unlock");
2718 		errcode = pthread_join(s->thread, (void **)&thread_err);
2719 		if (errcode)
2720 			return got_error_set_errno(errcode, "pthread_join");
2721 		errcode = pthread_mutex_lock(&tog_mutex);
2722 		if (errcode)
2723 			return got_error_set_errno(errcode,
2724 			    "pthread_mutex_lock");
2725 		s->thread = 0; //NULL;
2726 	}
2727 
2728 	if (s->thread_args.repo) {
2729 		err = got_repo_close(s->thread_args.repo);
2730 		s->thread_args.repo = NULL;
2731 	}
2732 
2733 	if (s->thread_args.pack_fds) {
2734 		const struct got_error *pack_err =
2735 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2736 		if (err == NULL)
2737 			err = pack_err;
2738 		s->thread_args.pack_fds = NULL;
2739 	}
2740 
2741 	if (s->thread_args.graph) {
2742 		got_commit_graph_close(s->thread_args.graph);
2743 		s->thread_args.graph = NULL;
2744 	}
2745 
2746 	return err ? err : thread_err;
2747 }
2748 
2749 static const struct got_error *
2750 close_log_view(struct tog_view *view)
2751 {
2752 	const struct got_error *err = NULL;
2753 	struct tog_log_view_state *s = &view->state.log;
2754 	int errcode;
2755 
2756 	err = stop_log_thread(s);
2757 
2758 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2759 	if (errcode && err == NULL)
2760 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2761 
2762 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2763 	if (errcode && err == NULL)
2764 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2765 
2766 	free_commits(&s->commits);
2767 	free(s->in_repo_path);
2768 	s->in_repo_path = NULL;
2769 	free(s->start_id);
2770 	s->start_id = NULL;
2771 	free(s->head_ref_name);
2772 	s->head_ref_name = NULL;
2773 	return err;
2774 }
2775 
2776 static const struct got_error *
2777 search_start_log_view(struct tog_view *view)
2778 {
2779 	struct tog_log_view_state *s = &view->state.log;
2780 
2781 	s->matched_entry = NULL;
2782 	s->search_entry = NULL;
2783 	return NULL;
2784 }
2785 
2786 static const struct got_error *
2787 search_next_log_view(struct tog_view *view)
2788 {
2789 	const struct got_error *err = NULL;
2790 	struct tog_log_view_state *s = &view->state.log;
2791 	struct commit_queue_entry *entry;
2792 
2793 	/* Display progress update in log view. */
2794 	show_log_view(view);
2795 	update_panels();
2796 	doupdate();
2797 
2798 	if (s->search_entry) {
2799 		int errcode, ch;
2800 		errcode = pthread_mutex_unlock(&tog_mutex);
2801 		if (errcode)
2802 			return got_error_set_errno(errcode,
2803 			    "pthread_mutex_unlock");
2804 		ch = wgetch(view->window);
2805 		errcode = pthread_mutex_lock(&tog_mutex);
2806 		if (errcode)
2807 			return got_error_set_errno(errcode,
2808 			    "pthread_mutex_lock");
2809 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2810 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2811 			return NULL;
2812 		}
2813 		if (view->searching == TOG_SEARCH_FORWARD)
2814 			entry = TAILQ_NEXT(s->search_entry, entry);
2815 		else
2816 			entry = TAILQ_PREV(s->search_entry,
2817 			    commit_queue_head, entry);
2818 	} else if (s->matched_entry) {
2819 		int matched_idx = s->matched_entry->idx;
2820 		int selected_idx = s->selected_entry->idx;
2821 
2822 		/*
2823 		 * If the user has moved the cursor after we hit a match,
2824 		 * the position from where we should continue searching
2825 		 * might have changed.
2826 		 */
2827 		if (view->searching == TOG_SEARCH_FORWARD) {
2828 			if (matched_idx > selected_idx)
2829 				entry = TAILQ_NEXT(s->selected_entry, entry);
2830 			else
2831 				entry = TAILQ_NEXT(s->matched_entry, entry);
2832 		} else {
2833 			if (matched_idx < selected_idx)
2834 				entry = TAILQ_PREV(s->selected_entry,
2835 						commit_queue_head, entry);
2836 			else
2837 				entry = TAILQ_PREV(s->matched_entry,
2838 						commit_queue_head, entry);
2839 		}
2840 	} else {
2841 		entry = s->selected_entry;
2842 	}
2843 
2844 	while (1) {
2845 		int have_match = 0;
2846 
2847 		if (entry == NULL) {
2848 			if (s->thread_args.log_complete ||
2849 			    view->searching == TOG_SEARCH_BACKWARD) {
2850 				view->search_next_done =
2851 				    (s->matched_entry == NULL ?
2852 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2853 				s->search_entry = NULL;
2854 				return NULL;
2855 			}
2856 			/*
2857 			 * Poke the log thread for more commits and return,
2858 			 * allowing the main loop to make progress. Search
2859 			 * will resume at s->search_entry once we come back.
2860 			 */
2861 			s->thread_args.commits_needed++;
2862 			return trigger_log_thread(view, 0);
2863 		}
2864 
2865 		err = match_commit(&have_match, entry->id, entry->commit,
2866 		    &view->regex);
2867 		if (err)
2868 			break;
2869 		if (have_match) {
2870 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2871 			s->matched_entry = entry;
2872 			break;
2873 		}
2874 
2875 		s->search_entry = entry;
2876 		if (view->searching == TOG_SEARCH_FORWARD)
2877 			entry = TAILQ_NEXT(entry, entry);
2878 		else
2879 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2880 	}
2881 
2882 	if (s->matched_entry) {
2883 		int cur = s->selected_entry->idx;
2884 		while (cur < s->matched_entry->idx) {
2885 			err = input_log_view(NULL, view, KEY_DOWN);
2886 			if (err)
2887 				return err;
2888 			cur++;
2889 		}
2890 		while (cur > s->matched_entry->idx) {
2891 			err = input_log_view(NULL, view, KEY_UP);
2892 			if (err)
2893 				return err;
2894 			cur--;
2895 		}
2896 	}
2897 
2898 	s->search_entry = NULL;
2899 
2900 	return NULL;
2901 }
2902 
2903 static const struct got_error *
2904 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2905     struct got_repository *repo, const char *head_ref_name,
2906     const char *in_repo_path, int log_branches)
2907 {
2908 	const struct got_error *err = NULL;
2909 	struct tog_log_view_state *s = &view->state.log;
2910 	struct got_repository *thread_repo = NULL;
2911 	struct got_commit_graph *thread_graph = NULL;
2912 	int errcode;
2913 
2914 	if (in_repo_path != s->in_repo_path) {
2915 		free(s->in_repo_path);
2916 		s->in_repo_path = strdup(in_repo_path);
2917 		if (s->in_repo_path == NULL)
2918 			return got_error_from_errno("strdup");
2919 	}
2920 
2921 	/* The commit queue only contains commits being displayed. */
2922 	TAILQ_INIT(&s->commits.head);
2923 	s->commits.ncommits = 0;
2924 
2925 	s->repo = repo;
2926 	if (head_ref_name) {
2927 		s->head_ref_name = strdup(head_ref_name);
2928 		if (s->head_ref_name == NULL) {
2929 			err = got_error_from_errno("strdup");
2930 			goto done;
2931 		}
2932 	}
2933 	s->start_id = got_object_id_dup(start_id);
2934 	if (s->start_id == NULL) {
2935 		err = got_error_from_errno("got_object_id_dup");
2936 		goto done;
2937 	}
2938 	s->log_branches = log_branches;
2939 
2940 	STAILQ_INIT(&s->colors);
2941 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2942 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2943 		    get_color_value("TOG_COLOR_COMMIT"));
2944 		if (err)
2945 			goto done;
2946 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2947 		    get_color_value("TOG_COLOR_AUTHOR"));
2948 		if (err) {
2949 			free_colors(&s->colors);
2950 			goto done;
2951 		}
2952 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2953 		    get_color_value("TOG_COLOR_DATE"));
2954 		if (err) {
2955 			free_colors(&s->colors);
2956 			goto done;
2957 		}
2958 	}
2959 
2960 	view->show = show_log_view;
2961 	view->input = input_log_view;
2962 	view->close = close_log_view;
2963 	view->search_start = search_start_log_view;
2964 	view->search_next = search_next_log_view;
2965 
2966 	if (s->thread_args.pack_fds == NULL) {
2967 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2968 		if (err)
2969 			goto done;
2970 	}
2971 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
2972 	    s->thread_args.pack_fds);
2973 	if (err)
2974 		goto done;
2975 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
2976 	    !s->log_branches);
2977 	if (err)
2978 		goto done;
2979 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
2980 	    s->repo, NULL, NULL);
2981 	if (err)
2982 		goto done;
2983 
2984 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
2985 	if (errcode) {
2986 		err = got_error_set_errno(errcode, "pthread_cond_init");
2987 		goto done;
2988 	}
2989 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
2990 	if (errcode) {
2991 		err = got_error_set_errno(errcode, "pthread_cond_init");
2992 		goto done;
2993 	}
2994 
2995 	s->thread_args.commits_needed = view->nlines;
2996 	s->thread_args.graph = thread_graph;
2997 	s->thread_args.commits = &s->commits;
2998 	s->thread_args.in_repo_path = s->in_repo_path;
2999 	s->thread_args.start_id = s->start_id;
3000 	s->thread_args.repo = thread_repo;
3001 	s->thread_args.log_complete = 0;
3002 	s->thread_args.quit = &s->quit;
3003 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3004 	s->thread_args.selected_entry = &s->selected_entry;
3005 	s->thread_args.searching = &view->searching;
3006 	s->thread_args.search_next_done = &view->search_next_done;
3007 	s->thread_args.regex = &view->regex;
3008 done:
3009 	if (err)
3010 		close_log_view(view);
3011 	return err;
3012 }
3013 
3014 static const struct got_error *
3015 show_log_view(struct tog_view *view)
3016 {
3017 	const struct got_error *err;
3018 	struct tog_log_view_state *s = &view->state.log;
3019 
3020 	if (s->thread == 0) { //NULL) {
3021 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3022 		    &s->thread_args);
3023 		if (errcode)
3024 			return got_error_set_errno(errcode, "pthread_create");
3025 		if (s->thread_args.commits_needed > 0) {
3026 			err = trigger_log_thread(view, 1);
3027 			if (err)
3028 				return err;
3029 		}
3030 	}
3031 
3032 	return draw_commits(view);
3033 }
3034 
3035 static void
3036 log_move_cursor_up(struct tog_view *view, int page, int home)
3037 {
3038 	struct tog_log_view_state *s = &view->state.log;
3039 
3040 	if (s->selected_entry->idx == 0)
3041 		view->count = 0;
3042 	if (s->first_displayed_entry == NULL)
3043 		return;
3044 
3045 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3046 	    || home)
3047 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3048 
3049 	if (!page && !home && s->selected > 0)
3050 		--s->selected;
3051 	else
3052 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3053 
3054 	select_commit(s);
3055 	return;
3056 }
3057 
3058 static const struct got_error *
3059 log_move_cursor_down(struct tog_view *view, int page)
3060 {
3061 	struct tog_log_view_state	*s = &view->state.log;
3062 	struct commit_queue_entry	*first;
3063 	const struct got_error		*err = NULL;
3064 
3065 	first = s->first_displayed_entry;
3066 	if (first == NULL) {
3067 		view->count = 0;
3068 		return NULL;
3069 	}
3070 
3071 	if (s->thread_args.log_complete &&
3072 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3073 		return NULL;
3074 
3075 	if (!page) {
3076 		int eos = view->nlines - 2;
3077 
3078 		if (view_is_hsplit_top(view))
3079 			--eos;  /* border consumes the last line */
3080 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3081 			++s->selected;
3082 		else
3083 			err = log_scroll_down(view, 1);
3084 	} else if (s->thread_args.load_all) {
3085 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3086 			s->selected += MIN(s->last_displayed_entry->idx -
3087 			    s->selected_entry->idx, page + 1);
3088 		else
3089 			err = log_scroll_down(view, MIN(page,
3090 			    s->commits.ncommits - s->selected_entry->idx - 1));
3091 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3092 	} else {
3093 		err = log_scroll_down(view, page);
3094 		if (err)
3095 			return err;
3096 		if (first == s->first_displayed_entry && s->selected <
3097 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3098 			s->selected = MIN(s->commits.ncommits - 1, page);
3099 		}
3100 	}
3101 	if (err)
3102 		return err;
3103 
3104 	/*
3105 	 * We might necessarily overshoot in horizontal
3106 	 * splits; if so, select the last displayed commit.
3107 	 */
3108 	s->selected = MIN(s->selected,
3109 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3110 
3111 	select_commit(s);
3112 
3113 	if (s->thread_args.log_complete &&
3114 	    s->selected_entry->idx == s->commits.ncommits - 1)
3115 		view->count = 0;
3116 
3117 	return NULL;
3118 }
3119 
3120 static void
3121 view_get_split(struct tog_view *view, int *y, int *x)
3122 {
3123 	*x = 0;
3124 	*y = 0;
3125 
3126 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3127 		if (view->child && view->child->resized_y)
3128 			*y = view->child->resized_y;
3129 		else if (view->resized_y)
3130 			*y = view->resized_y;
3131 		else
3132 			*y = view_split_begin_y(view->lines);
3133 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3134 		if (view->child && view->child->resized_x)
3135 			*x = view->child->resized_x;
3136 		else if (view->resized_x)
3137 			*x = view->resized_x;
3138 		else
3139 			*x = view_split_begin_x(view->begin_x);
3140 	}
3141 }
3142 
3143 /* Split view horizontally at y and offset view->state->selected line. */
3144 static const struct got_error *
3145 view_init_hsplit(struct tog_view *view, int y)
3146 {
3147 	const struct got_error *err = NULL;
3148 
3149 	view->nlines = y;
3150 	view->ncols = COLS;
3151 	err = view_resize(view);
3152 	if (err)
3153 		return err;
3154 
3155 	err = offset_selection_down(view);
3156 
3157 	return err;
3158 }
3159 
3160 static const struct got_error *
3161 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3162 {
3163 	const struct got_error *err = NULL;
3164 	struct tog_log_view_state *s = &view->state.log;
3165 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3166 	struct tog_view *ref_view = NULL;
3167 	struct commit_queue_entry *entry;
3168 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3169 
3170 	if (s->thread_args.load_all) {
3171 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3172 			s->thread_args.load_all = 0;
3173 		else if (s->thread_args.log_complete) {
3174 			err = log_move_cursor_down(view, s->commits.ncommits);
3175 			s->thread_args.load_all = 0;
3176 		}
3177 		return err;
3178 	}
3179 
3180 	eos = nscroll = view->nlines - 1;
3181 	if (view_is_hsplit_top(view))
3182 		--eos;  /* border */
3183 
3184 	switch (ch) {
3185 	case 'q':
3186 		s->quit = 1;
3187 		break;
3188 	case '0':
3189 		view->x = 0;
3190 		break;
3191 	case '$':
3192 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3193 		view->count = 0;
3194 		break;
3195 	case KEY_RIGHT:
3196 	case 'l':
3197 		if (view->x + view->ncols / 2 < view->maxx)
3198 			view->x += 2;  /* move two columns right */
3199 		else
3200 			view->count = 0;
3201 		break;
3202 	case KEY_LEFT:
3203 	case 'h':
3204 		view->x -= MIN(view->x, 2);  /* move two columns back */
3205 		if (view->x <= 0)
3206 			view->count = 0;
3207 		break;
3208 	case 'k':
3209 	case KEY_UP:
3210 	case '<':
3211 	case ',':
3212 	case CTRL('p'):
3213 		log_move_cursor_up(view, 0, 0);
3214 		break;
3215 	case 'g':
3216 	case KEY_HOME:
3217 		log_move_cursor_up(view, 0, 1);
3218 		view->count = 0;
3219 		break;
3220 	case CTRL('u'):
3221 	case 'u':
3222 		nscroll /= 2;
3223 		/* FALL THROUGH */
3224 	case KEY_PPAGE:
3225 	case CTRL('b'):
3226 	case 'b':
3227 		log_move_cursor_up(view, nscroll, 0);
3228 		break;
3229 	case 'j':
3230 	case KEY_DOWN:
3231 	case '>':
3232 	case '.':
3233 	case CTRL('n'):
3234 		err = log_move_cursor_down(view, 0);
3235 		break;
3236 	case 'G':
3237 	case KEY_END: {
3238 		/* We don't know yet how many commits, so we're forced to
3239 		 * traverse them all. */
3240 		view->count = 0;
3241 		if (!s->thread_args.log_complete) {
3242 			s->thread_args.load_all = 1;
3243 			return trigger_log_thread(view, 0);
3244 		}
3245 
3246 		s->selected = 0;
3247 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3248 		for (n = 0; n < eos; n++) {
3249 			if (entry == NULL)
3250 				break;
3251 			s->first_displayed_entry = entry;
3252 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3253 		}
3254 		if (n > 0)
3255 			s->selected = n - 1;
3256 		select_commit(s);
3257 		break;
3258 	}
3259 	case CTRL('d'):
3260 	case 'd':
3261 		nscroll /= 2;
3262 		/* FALL THROUGH */
3263 	case KEY_NPAGE:
3264 	case CTRL('f'):
3265 	case 'f':
3266 	case ' ':
3267 		err = log_move_cursor_down(view, nscroll);
3268 		break;
3269 	case KEY_RESIZE:
3270 		if (s->selected > view->nlines - 2)
3271 			s->selected = view->nlines - 2;
3272 		if (s->selected > s->commits.ncommits - 1)
3273 			s->selected = s->commits.ncommits - 1;
3274 		select_commit(s);
3275 		if (s->commits.ncommits < view->nlines - 1 &&
3276 		    !s->thread_args.log_complete) {
3277 			s->thread_args.commits_needed += (view->nlines - 1) -
3278 			    s->commits.ncommits;
3279 			err = trigger_log_thread(view, 1);
3280 		}
3281 		break;
3282 	case KEY_ENTER:
3283 	case '\r':
3284 		view->count = 0;
3285 		if (s->selected_entry == NULL)
3286 			break;
3287 
3288 		/* get dimensions--don't split till initialisation succeeds */
3289 		if (view_is_parent_view(view))
3290 			view_get_split(view, &begin_y, &begin_x);
3291 
3292 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3293 		    s->selected_entry->commit, s->selected_entry->id,
3294 		    view, s->repo);
3295 		if (err)
3296 			break;
3297 
3298 		if (view_is_parent_view(view) &&
3299 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3300 			err = view_init_hsplit(view, begin_y);
3301 			if (err)
3302 				break;
3303 		}
3304 
3305 		view->focussed = 0;
3306 		diff_view->focussed = 1;
3307 		diff_view->mode = view->mode;
3308 		diff_view->nlines = view->lines - begin_y;
3309 
3310 		if (view_is_parent_view(view)) {
3311 			view_transfer_size(diff_view, view);
3312 			err = view_close_child(view);
3313 			if (err)
3314 				return err;
3315 			err = view_set_child(view, diff_view);
3316 			if (err)
3317 				return err;
3318 			view->focus_child = 1;
3319 		} else
3320 			*new_view = diff_view;
3321 		break;
3322 	case 't':
3323 		view->count = 0;
3324 		if (s->selected_entry == NULL)
3325 			break;
3326 		if (view_is_parent_view(view))
3327 			view_get_split(view, &begin_y, &begin_x);
3328 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3329 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3330 		    s->repo);
3331 		if (err)
3332 			break;
3333 		if (view_is_parent_view(view) &&
3334 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3335 			err = view_init_hsplit(view, begin_y);
3336 			if (err)
3337 				break;
3338 		}
3339 		view->focussed = 0;
3340 		tree_view->focussed = 1;
3341 		tree_view->mode = view->mode;
3342 		tree_view->nlines = view->lines - begin_y;
3343 		if (view_is_parent_view(view)) {
3344 			view_transfer_size(tree_view, view);
3345 			err = view_close_child(view);
3346 			if (err)
3347 				return err;
3348 			err = view_set_child(view, tree_view);
3349 			if (err)
3350 				return err;
3351 			view->focus_child = 1;
3352 		} else
3353 			*new_view = tree_view;
3354 		break;
3355 	case KEY_BACKSPACE:
3356 	case CTRL('l'):
3357 	case 'B':
3358 		view->count = 0;
3359 		if (ch == KEY_BACKSPACE &&
3360 		    got_path_is_root_dir(s->in_repo_path))
3361 			break;
3362 		err = stop_log_thread(s);
3363 		if (err)
3364 			return err;
3365 		if (ch == KEY_BACKSPACE) {
3366 			char *parent_path;
3367 			err = got_path_dirname(&parent_path, s->in_repo_path);
3368 			if (err)
3369 				return err;
3370 			free(s->in_repo_path);
3371 			s->in_repo_path = parent_path;
3372 			s->thread_args.in_repo_path = s->in_repo_path;
3373 		} else if (ch == CTRL('l')) {
3374 			struct got_object_id *start_id;
3375 			err = got_repo_match_object_id(&start_id, NULL,
3376 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3377 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3378 			if (err)
3379 				return err;
3380 			free(s->start_id);
3381 			s->start_id = start_id;
3382 			s->thread_args.start_id = s->start_id;
3383 		} else /* 'B' */
3384 			s->log_branches = !s->log_branches;
3385 
3386 		if (s->thread_args.pack_fds == NULL) {
3387 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3388 			if (err)
3389 				return err;
3390 		}
3391 		err = got_repo_open(&s->thread_args.repo,
3392 		    got_repo_get_path(s->repo), NULL,
3393 		    s->thread_args.pack_fds);
3394 		if (err)
3395 			return err;
3396 		tog_free_refs();
3397 		err = tog_load_refs(s->repo, 0);
3398 		if (err)
3399 			return err;
3400 		err = got_commit_graph_open(&s->thread_args.graph,
3401 		    s->in_repo_path, !s->log_branches);
3402 		if (err)
3403 			return err;
3404 		err = got_commit_graph_iter_start(s->thread_args.graph,
3405 		    s->start_id, s->repo, NULL, NULL);
3406 		if (err)
3407 			return err;
3408 		free_commits(&s->commits);
3409 		s->first_displayed_entry = NULL;
3410 		s->last_displayed_entry = NULL;
3411 		s->selected_entry = NULL;
3412 		s->selected = 0;
3413 		s->thread_args.log_complete = 0;
3414 		s->quit = 0;
3415 		s->thread_args.commits_needed = view->lines;
3416 		s->matched_entry = NULL;
3417 		s->search_entry = NULL;
3418 		break;
3419 	case 'r':
3420 		view->count = 0;
3421 		if (view_is_parent_view(view))
3422 			view_get_split(view, &begin_y, &begin_x);
3423 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3424 		if (ref_view == NULL)
3425 			return got_error_from_errno("view_open");
3426 		err = open_ref_view(ref_view, s->repo);
3427 		if (err) {
3428 			view_close(ref_view);
3429 			return err;
3430 		}
3431 		if (view_is_parent_view(view) &&
3432 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3433 			err = view_init_hsplit(view, begin_y);
3434 			if (err)
3435 				break;
3436 		}
3437 		view->focussed = 0;
3438 		ref_view->focussed = 1;
3439 		ref_view->mode = view->mode;
3440 		ref_view->nlines = view->lines - begin_y;
3441 		if (view_is_parent_view(view)) {
3442 			view_transfer_size(ref_view, view);
3443 			err = view_close_child(view);
3444 			if (err)
3445 				return err;
3446 			err = view_set_child(view, ref_view);
3447 			if (err)
3448 				return err;
3449 			view->focus_child = 1;
3450 		} else
3451 			*new_view = ref_view;
3452 		break;
3453 	default:
3454 		view->count = 0;
3455 		break;
3456 	}
3457 
3458 	return err;
3459 }
3460 
3461 static const struct got_error *
3462 apply_unveil(const char *repo_path, const char *worktree_path)
3463 {
3464 	const struct got_error *error;
3465 
3466 #ifdef PROFILE
3467 	if (unveil("gmon.out", "rwc") != 0)
3468 		return got_error_from_errno2("unveil", "gmon.out");
3469 #endif
3470 	if (repo_path && unveil(repo_path, "r") != 0)
3471 		return got_error_from_errno2("unveil", repo_path);
3472 
3473 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3474 		return got_error_from_errno2("unveil", worktree_path);
3475 
3476 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3477 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3478 
3479 	error = got_privsep_unveil_exec_helpers();
3480 	if (error != NULL)
3481 		return error;
3482 
3483 	if (unveil(NULL, NULL) != 0)
3484 		return got_error_from_errno("unveil");
3485 
3486 	return NULL;
3487 }
3488 
3489 static void
3490 init_curses(void)
3491 {
3492 	/*
3493 	 * Override default signal handlers before starting ncurses.
3494 	 * This should prevent ncurses from installing its own
3495 	 * broken cleanup() signal handler.
3496 	 */
3497 	signal(SIGWINCH, tog_sigwinch);
3498 	signal(SIGPIPE, tog_sigpipe);
3499 	signal(SIGCONT, tog_sigcont);
3500 	signal(SIGINT, tog_sigint);
3501 	signal(SIGTERM, tog_sigterm);
3502 
3503 	initscr();
3504 	cbreak();
3505 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3506 	noecho();
3507 	nonl();
3508 	intrflush(stdscr, FALSE);
3509 	keypad(stdscr, TRUE);
3510 	curs_set(0);
3511 	if (getenv("TOG_COLORS") != NULL) {
3512 		start_color();
3513 		use_default_colors();
3514 	}
3515 }
3516 
3517 static const struct got_error *
3518 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3519     struct got_repository *repo, struct got_worktree *worktree)
3520 {
3521 	const struct got_error *err = NULL;
3522 
3523 	if (argc == 0) {
3524 		*in_repo_path = strdup("/");
3525 		if (*in_repo_path == NULL)
3526 			return got_error_from_errno("strdup");
3527 		return NULL;
3528 	}
3529 
3530 	if (worktree) {
3531 		const char *prefix = got_worktree_get_path_prefix(worktree);
3532 		char *p;
3533 
3534 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3535 		if (err)
3536 			return err;
3537 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3538 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3539 		    p) == -1) {
3540 			err = got_error_from_errno("asprintf");
3541 			*in_repo_path = NULL;
3542 		}
3543 		free(p);
3544 	} else
3545 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3546 
3547 	return err;
3548 }
3549 
3550 static const struct got_error *
3551 cmd_log(int argc, char *argv[])
3552 {
3553 	const struct got_error *error;
3554 	struct got_repository *repo = NULL;
3555 	struct got_worktree *worktree = NULL;
3556 	struct got_object_id *start_id = NULL;
3557 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3558 	char *start_commit = NULL, *label = NULL;
3559 	struct got_reference *ref = NULL;
3560 	const char *head_ref_name = NULL;
3561 	int ch, log_branches = 0;
3562 	struct tog_view *view;
3563 	int *pack_fds = NULL;
3564 
3565 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3566 		switch (ch) {
3567 		case 'b':
3568 			log_branches = 1;
3569 			break;
3570 		case 'c':
3571 			start_commit = optarg;
3572 			break;
3573 		case 'r':
3574 			repo_path = realpath(optarg, NULL);
3575 			if (repo_path == NULL)
3576 				return got_error_from_errno2("realpath",
3577 				    optarg);
3578 			break;
3579 		default:
3580 			usage_log();
3581 			/* NOTREACHED */
3582 		}
3583 	}
3584 
3585 	argc -= optind;
3586 	argv += optind;
3587 
3588 	if (argc > 1)
3589 		usage_log();
3590 
3591 	error = got_repo_pack_fds_open(&pack_fds);
3592 	if (error != NULL)
3593 		goto done;
3594 
3595 	if (repo_path == NULL) {
3596 		cwd = getcwd(NULL, 0);
3597 		if (cwd == NULL)
3598 			return got_error_from_errno("getcwd");
3599 		error = got_worktree_open(&worktree, cwd);
3600 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3601 			goto done;
3602 		if (worktree)
3603 			repo_path =
3604 			    strdup(got_worktree_get_repo_path(worktree));
3605 		else
3606 			repo_path = strdup(cwd);
3607 		if (repo_path == NULL) {
3608 			error = got_error_from_errno("strdup");
3609 			goto done;
3610 		}
3611 	}
3612 
3613 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3614 	if (error != NULL)
3615 		goto done;
3616 
3617 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3618 	    repo, worktree);
3619 	if (error)
3620 		goto done;
3621 
3622 	init_curses();
3623 
3624 	error = apply_unveil(got_repo_get_path(repo),
3625 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3626 	if (error)
3627 		goto done;
3628 
3629 	/* already loaded by tog_log_with_path()? */
3630 	if (TAILQ_EMPTY(&tog_refs)) {
3631 		error = tog_load_refs(repo, 0);
3632 		if (error)
3633 			goto done;
3634 	}
3635 
3636 	if (start_commit == NULL) {
3637 		error = got_repo_match_object_id(&start_id, &label,
3638 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3639 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3640 		if (error)
3641 			goto done;
3642 		head_ref_name = label;
3643 	} else {
3644 		error = got_ref_open(&ref, repo, start_commit, 0);
3645 		if (error == NULL)
3646 			head_ref_name = got_ref_get_name(ref);
3647 		else if (error->code != GOT_ERR_NOT_REF)
3648 			goto done;
3649 		error = got_repo_match_object_id(&start_id, NULL,
3650 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3651 		if (error)
3652 			goto done;
3653 	}
3654 
3655 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3656 	if (view == NULL) {
3657 		error = got_error_from_errno("view_open");
3658 		goto done;
3659 	}
3660 	error = open_log_view(view, start_id, repo, head_ref_name,
3661 	    in_repo_path, log_branches);
3662 	if (error)
3663 		goto done;
3664 	if (worktree) {
3665 		/* Release work tree lock. */
3666 		got_worktree_close(worktree);
3667 		worktree = NULL;
3668 	}
3669 	error = view_loop(view);
3670 done:
3671 	free(in_repo_path);
3672 	free(repo_path);
3673 	free(cwd);
3674 	free(start_id);
3675 	free(label);
3676 	if (ref)
3677 		got_ref_close(ref);
3678 	if (repo) {
3679 		const struct got_error *close_err = got_repo_close(repo);
3680 		if (error == NULL)
3681 			error = close_err;
3682 	}
3683 	if (worktree)
3684 		got_worktree_close(worktree);
3685 	if (pack_fds) {
3686 		const struct got_error *pack_err =
3687 		    got_repo_pack_fds_close(pack_fds);
3688 		if (error == NULL)
3689 			error = pack_err;
3690 	}
3691 	tog_free_refs();
3692 	return error;
3693 }
3694 
3695 __dead static void
3696 usage_diff(void)
3697 {
3698 	endwin();
3699 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3700 	    "[-w] object1 object2\n", getprogname());
3701 	exit(1);
3702 }
3703 
3704 static int
3705 match_line(const char *line, regex_t *regex, size_t nmatch,
3706     regmatch_t *regmatch)
3707 {
3708 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3709 }
3710 
3711 static struct tog_color *
3712 match_color(struct tog_colors *colors, const char *line)
3713 {
3714 	struct tog_color *tc = NULL;
3715 
3716 	STAILQ_FOREACH(tc, colors, entry) {
3717 		if (match_line(line, &tc->regex, 0, NULL))
3718 			return tc;
3719 	}
3720 
3721 	return NULL;
3722 }
3723 
3724 static const struct got_error *
3725 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3726     WINDOW *window, int skipcol, regmatch_t *regmatch)
3727 {
3728 	const struct got_error *err = NULL;
3729 	char *exstr = NULL;
3730 	wchar_t *wline = NULL;
3731 	int rme, rms, n, width, scrollx;
3732 	int width0 = 0, width1 = 0, width2 = 0;
3733 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3734 
3735 	*wtotal = 0;
3736 
3737 	rms = regmatch->rm_so;
3738 	rme = regmatch->rm_eo;
3739 
3740 	err = expand_tab(&exstr, line);
3741 	if (err)
3742 		return err;
3743 
3744 	/* Split the line into 3 segments, according to match offsets. */
3745 	seg0 = strndup(exstr, rms);
3746 	if (seg0 == NULL) {
3747 		err = got_error_from_errno("strndup");
3748 		goto done;
3749 	}
3750 	seg1 = strndup(exstr + rms, rme - rms);
3751 	if (seg1 == NULL) {
3752 		err = got_error_from_errno("strndup");
3753 		goto done;
3754 	}
3755 	seg2 = strdup(exstr + rme);
3756 	if (seg2 == NULL) {
3757 		err = got_error_from_errno("strndup");
3758 		goto done;
3759 	}
3760 
3761 	/* draw up to matched token if we haven't scrolled past it */
3762 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3763 	    col_tab_align, 1);
3764 	if (err)
3765 		goto done;
3766 	n = MAX(width0 - skipcol, 0);
3767 	if (n) {
3768 		free(wline);
3769 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3770 		    wlimit, col_tab_align, 1);
3771 		if (err)
3772 			goto done;
3773 		waddwstr(window, &wline[scrollx]);
3774 		wlimit -= width;
3775 		*wtotal += width;
3776 	}
3777 
3778 	if (wlimit > 0) {
3779 		int i = 0, w = 0;
3780 		size_t wlen;
3781 
3782 		free(wline);
3783 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3784 		    col_tab_align, 1);
3785 		if (err)
3786 			goto done;
3787 		wlen = wcslen(wline);
3788 		while (i < wlen) {
3789 			width = wcwidth(wline[i]);
3790 			if (width == -1) {
3791 				/* should not happen, tabs are expanded */
3792 				err = got_error(GOT_ERR_RANGE);
3793 				goto done;
3794 			}
3795 			if (width0 + w + width > skipcol)
3796 				break;
3797 			w += width;
3798 			i++;
3799 		}
3800 		/* draw (visible part of) matched token (if scrolled into it) */
3801 		if (width1 - w > 0) {
3802 			wattron(window, A_STANDOUT);
3803 			waddwstr(window, &wline[i]);
3804 			wattroff(window, A_STANDOUT);
3805 			wlimit -= (width1 - w);
3806 			*wtotal += (width1 - w);
3807 		}
3808 	}
3809 
3810 	if (wlimit > 0) {  /* draw rest of line */
3811 		free(wline);
3812 		if (skipcol > width0 + width1) {
3813 			err = format_line(&wline, &width2, &scrollx, seg2,
3814 			    skipcol - (width0 + width1), wlimit,
3815 			    col_tab_align, 1);
3816 			if (err)
3817 				goto done;
3818 			waddwstr(window, &wline[scrollx]);
3819 		} else {
3820 			err = format_line(&wline, &width2, NULL, seg2, 0,
3821 			    wlimit, col_tab_align, 1);
3822 			if (err)
3823 				goto done;
3824 			waddwstr(window, wline);
3825 		}
3826 		*wtotal += width2;
3827 	}
3828 done:
3829 	free(wline);
3830 	free(exstr);
3831 	free(seg0);
3832 	free(seg1);
3833 	free(seg2);
3834 	return err;
3835 }
3836 
3837 static const struct got_error *
3838 draw_file(struct tog_view *view, const char *header)
3839 {
3840 	struct tog_diff_view_state *s = &view->state.diff;
3841 	regmatch_t *regmatch = &view->regmatch;
3842 	const struct got_error *err;
3843 	int nprinted = 0;
3844 	char *line;
3845 	size_t linesize = 0;
3846 	ssize_t linelen;
3847 	struct tog_color *tc;
3848 	wchar_t *wline;
3849 	int width;
3850 	int max_lines = view->nlines;
3851 	int nlines = s->nlines;
3852 	off_t line_offset;
3853 
3854 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3855 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3856 		return got_error_from_errno("fseek");
3857 
3858 	werase(view->window);
3859 
3860 	if (header) {
3861 		if (asprintf(&line, "[%d/%d] %s",
3862 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3863 		    header) == -1)
3864 			return got_error_from_errno("asprintf");
3865 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3866 		    0, 0);
3867 		free(line);
3868 		if (err)
3869 			return err;
3870 
3871 		if (view_needs_focus_indication(view))
3872 			wstandout(view->window);
3873 		waddwstr(view->window, wline);
3874 		free(wline);
3875 		wline = NULL;
3876 		if (view_needs_focus_indication(view))
3877 			wstandend(view->window);
3878 		if (width <= view->ncols - 1)
3879 			waddch(view->window, '\n');
3880 
3881 		if (max_lines <= 1)
3882 			return NULL;
3883 		max_lines--;
3884 	}
3885 
3886 	s->eof = 0;
3887 	view->maxx = 0;
3888 	line = NULL;
3889 	while (max_lines > 0 && nprinted < max_lines) {
3890 		linelen = getline(&line, &linesize, s->f);
3891 		if (linelen == -1) {
3892 			if (feof(s->f)) {
3893 				s->eof = 1;
3894 				break;
3895 			}
3896 			free(line);
3897 			return got_ferror(s->f, GOT_ERR_IO);
3898 		}
3899 
3900 		/* Set view->maxx based on full line length. */
3901 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3902 		    view->x ? 1 : 0);
3903 		if (err) {
3904 			free(line);
3905 			return err;
3906 		}
3907 		view->maxx = MAX(view->maxx, width);
3908 		free(wline);
3909 		wline = NULL;
3910 
3911 		tc = match_color(&s->colors, line);
3912 		if (tc)
3913 			wattr_on(view->window,
3914 			    COLOR_PAIR(tc->colorpair), NULL);
3915 		if (s->first_displayed_line + nprinted == s->matched_line &&
3916 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3917 			err = add_matched_line(&width, line, view->ncols, 0,
3918 			    view->window, view->x, regmatch);
3919 			if (err) {
3920 				free(line);
3921 				return err;
3922 			}
3923 		} else {
3924 			int skip;
3925 			err = format_line(&wline, &width, &skip, line,
3926 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3927 			if (err) {
3928 				free(line);
3929 				return err;
3930 			}
3931 			waddwstr(view->window, &wline[skip]);
3932 			free(wline);
3933 			wline = NULL;
3934 		}
3935 		if (tc)
3936 			wattr_off(view->window,
3937 			    COLOR_PAIR(tc->colorpair), NULL);
3938 		if (width <= view->ncols - 1)
3939 			waddch(view->window, '\n');
3940 		nprinted++;
3941 	}
3942 	free(line);
3943 	if (nprinted >= 1)
3944 		s->last_displayed_line = s->first_displayed_line +
3945 		    (nprinted - 1);
3946 	else
3947 		s->last_displayed_line = s->first_displayed_line;
3948 
3949 	view_border(view);
3950 
3951 	if (s->eof) {
3952 		while (nprinted < view->nlines) {
3953 			waddch(view->window, '\n');
3954 			nprinted++;
3955 		}
3956 
3957 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3958 		    view->ncols, 0, 0);
3959 		if (err) {
3960 			return err;
3961 		}
3962 
3963 		wstandout(view->window);
3964 		waddwstr(view->window, wline);
3965 		free(wline);
3966 		wline = NULL;
3967 		wstandend(view->window);
3968 	}
3969 
3970 	return NULL;
3971 }
3972 
3973 static char *
3974 get_datestr(time_t *time, char *datebuf)
3975 {
3976 	struct tm mytm, *tm;
3977 	char *p, *s;
3978 
3979 	tm = gmtime_r(time, &mytm);
3980 	if (tm == NULL)
3981 		return NULL;
3982 	s = asctime_r(tm, datebuf);
3983 	if (s == NULL)
3984 		return NULL;
3985 	p = strchr(s, '\n');
3986 	if (p)
3987 		*p = '\0';
3988 	return s;
3989 }
3990 
3991 static const struct got_error *
3992 get_changed_paths(struct got_pathlist_head *paths,
3993     struct got_commit_object *commit, struct got_repository *repo)
3994 {
3995 	const struct got_error *err = NULL;
3996 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
3997 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
3998 	struct got_object_qid *qid;
3999 
4000 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4001 	if (qid != NULL) {
4002 		struct got_commit_object *pcommit;
4003 		err = got_object_open_as_commit(&pcommit, repo,
4004 		    &qid->id);
4005 		if (err)
4006 			return err;
4007 
4008 		tree_id1 = got_object_id_dup(
4009 		    got_object_commit_get_tree_id(pcommit));
4010 		if (tree_id1 == NULL) {
4011 			got_object_commit_close(pcommit);
4012 			return got_error_from_errno("got_object_id_dup");
4013 		}
4014 		got_object_commit_close(pcommit);
4015 
4016 	}
4017 
4018 	if (tree_id1) {
4019 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4020 		if (err)
4021 			goto done;
4022 	}
4023 
4024 	tree_id2 = got_object_commit_get_tree_id(commit);
4025 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4026 	if (err)
4027 		goto done;
4028 
4029 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4030 	    got_diff_tree_collect_changed_paths, paths, 0);
4031 done:
4032 	if (tree1)
4033 		got_object_tree_close(tree1);
4034 	if (tree2)
4035 		got_object_tree_close(tree2);
4036 	free(tree_id1);
4037 	return err;
4038 }
4039 
4040 static const struct got_error *
4041 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4042 {
4043 	off_t *p;
4044 
4045 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4046 	if (p == NULL)
4047 		return got_error_from_errno("reallocarray");
4048 	*line_offsets = p;
4049 	(*line_offsets)[*nlines] = off;
4050 	(*nlines)++;
4051 	return NULL;
4052 }
4053 
4054 static const struct got_error *
4055 write_commit_info(off_t **line_offsets, size_t *nlines,
4056     struct got_object_id *commit_id, struct got_reflist_head *refs,
4057     struct got_repository *repo, FILE *outfile)
4058 {
4059 	const struct got_error *err = NULL;
4060 	char datebuf[26], *datestr;
4061 	struct got_commit_object *commit;
4062 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4063 	time_t committer_time;
4064 	const char *author, *committer;
4065 	char *refs_str = NULL;
4066 	struct got_pathlist_head changed_paths;
4067 	struct got_pathlist_entry *pe;
4068 	off_t outoff = 0;
4069 	int n;
4070 
4071 	TAILQ_INIT(&changed_paths);
4072 
4073 	if (refs) {
4074 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4075 		if (err)
4076 			return err;
4077 	}
4078 
4079 	err = got_object_open_as_commit(&commit, repo, commit_id);
4080 	if (err)
4081 		return err;
4082 
4083 	err = got_object_id_str(&id_str, commit_id);
4084 	if (err) {
4085 		err = got_error_from_errno("got_object_id_str");
4086 		goto done;
4087 	}
4088 
4089 	err = add_line_offset(line_offsets, nlines, 0);
4090 	if (err)
4091 		goto done;
4092 
4093 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4094 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4095 	if (n < 0) {
4096 		err = got_error_from_errno("fprintf");
4097 		goto done;
4098 	}
4099 	outoff += n;
4100 	err = add_line_offset(line_offsets, nlines, outoff);
4101 	if (err)
4102 		goto done;
4103 
4104 	n = fprintf(outfile, "from: %s\n",
4105 	    got_object_commit_get_author(commit));
4106 	if (n < 0) {
4107 		err = got_error_from_errno("fprintf");
4108 		goto done;
4109 	}
4110 	outoff += n;
4111 	err = add_line_offset(line_offsets, nlines, outoff);
4112 	if (err)
4113 		goto done;
4114 
4115 	committer_time = got_object_commit_get_committer_time(commit);
4116 	datestr = get_datestr(&committer_time, datebuf);
4117 	if (datestr) {
4118 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4119 		if (n < 0) {
4120 			err = got_error_from_errno("fprintf");
4121 			goto done;
4122 		}
4123 		outoff += n;
4124 		err = add_line_offset(line_offsets, nlines, outoff);
4125 		if (err)
4126 			goto done;
4127 	}
4128 	author = got_object_commit_get_author(commit);
4129 	committer = got_object_commit_get_committer(commit);
4130 	if (strcmp(author, committer) != 0) {
4131 		n = fprintf(outfile, "via: %s\n", committer);
4132 		if (n < 0) {
4133 			err = got_error_from_errno("fprintf");
4134 			goto done;
4135 		}
4136 		outoff += n;
4137 		err = add_line_offset(line_offsets, nlines, outoff);
4138 		if (err)
4139 			goto done;
4140 	}
4141 	if (got_object_commit_get_nparents(commit) > 1) {
4142 		const struct got_object_id_queue *parent_ids;
4143 		struct got_object_qid *qid;
4144 		int pn = 1;
4145 		parent_ids = got_object_commit_get_parent_ids(commit);
4146 		STAILQ_FOREACH(qid, parent_ids, entry) {
4147 			err = got_object_id_str(&id_str, &qid->id);
4148 			if (err)
4149 				goto done;
4150 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4151 			if (n < 0) {
4152 				err = got_error_from_errno("fprintf");
4153 				goto done;
4154 			}
4155 			outoff += n;
4156 			err = add_line_offset(line_offsets, nlines, outoff);
4157 			if (err)
4158 				goto done;
4159 			free(id_str);
4160 			id_str = NULL;
4161 		}
4162 	}
4163 
4164 	err = got_object_commit_get_logmsg(&logmsg, commit);
4165 	if (err)
4166 		goto done;
4167 	s = logmsg;
4168 	while ((line = strsep(&s, "\n")) != NULL) {
4169 		n = fprintf(outfile, "%s\n", line);
4170 		if (n < 0) {
4171 			err = got_error_from_errno("fprintf");
4172 			goto done;
4173 		}
4174 		outoff += n;
4175 		err = add_line_offset(line_offsets, nlines, outoff);
4176 		if (err)
4177 			goto done;
4178 	}
4179 
4180 	err = get_changed_paths(&changed_paths, commit, repo);
4181 	if (err)
4182 		goto done;
4183 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4184 		struct got_diff_changed_path *cp = pe->data;
4185 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4186 		if (n < 0) {
4187 			err = got_error_from_errno("fprintf");
4188 			goto done;
4189 		}
4190 		outoff += n;
4191 		err = add_line_offset(line_offsets, nlines, outoff);
4192 		if (err)
4193 			goto done;
4194 		free((char *)pe->path);
4195 		free(pe->data);
4196 	}
4197 
4198 	fputc('\n', outfile);
4199 	outoff++;
4200 	err = add_line_offset(line_offsets, nlines, outoff);
4201 done:
4202 	got_pathlist_free(&changed_paths);
4203 	free(id_str);
4204 	free(logmsg);
4205 	free(refs_str);
4206 	got_object_commit_close(commit);
4207 	if (err) {
4208 		free(*line_offsets);
4209 		*line_offsets = NULL;
4210 		*nlines = 0;
4211 	}
4212 	return err;
4213 }
4214 
4215 static const struct got_error *
4216 create_diff(struct tog_diff_view_state *s)
4217 {
4218 	const struct got_error *err = NULL;
4219 	FILE *f = NULL;
4220 	int obj_type;
4221 
4222 	free(s->line_offsets);
4223 	s->line_offsets = malloc(sizeof(off_t));
4224 	if (s->line_offsets == NULL)
4225 		return got_error_from_errno("malloc");
4226 	s->nlines = 0;
4227 
4228 	f = got_opentemp();
4229 	if (f == NULL) {
4230 		err = got_error_from_errno("got_opentemp");
4231 		goto done;
4232 	}
4233 	if (s->f && fclose(s->f) == EOF) {
4234 		err = got_error_from_errno("fclose");
4235 		goto done;
4236 	}
4237 	s->f = f;
4238 
4239 	if (s->id1)
4240 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4241 	else
4242 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4243 	if (err)
4244 		goto done;
4245 
4246 	switch (obj_type) {
4247 	case GOT_OBJ_TYPE_BLOB:
4248 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4249 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4250 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4251 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4252 		break;
4253 	case GOT_OBJ_TYPE_TREE:
4254 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4255 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4256 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4257 		    s->force_text_diff, s->repo, s->f);
4258 		break;
4259 	case GOT_OBJ_TYPE_COMMIT: {
4260 		const struct got_object_id_queue *parent_ids;
4261 		struct got_object_qid *pid;
4262 		struct got_commit_object *commit2;
4263 		struct got_reflist_head *refs;
4264 
4265 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4266 		if (err)
4267 			goto done;
4268 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4269 		/* Show commit info if we're diffing to a parent/root commit. */
4270 		if (s->id1 == NULL) {
4271 			err = write_commit_info(&s->line_offsets, &s->nlines,
4272 			    s->id2, refs, s->repo, s->f);
4273 			if (err)
4274 				goto done;
4275 		} else {
4276 			parent_ids = got_object_commit_get_parent_ids(commit2);
4277 			STAILQ_FOREACH(pid, parent_ids, entry) {
4278 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4279 					err = write_commit_info(
4280 					    &s->line_offsets, &s->nlines,
4281 					    s->id2, refs, s->repo, s->f);
4282 					if (err)
4283 						goto done;
4284 					break;
4285 				}
4286 			}
4287 		}
4288 		got_object_commit_close(commit2);
4289 
4290 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4291 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4292 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4293 		    s->force_text_diff, s->repo, s->f);
4294 		break;
4295 	}
4296 	default:
4297 		err = got_error(GOT_ERR_OBJ_TYPE);
4298 		break;
4299 	}
4300 	if (err)
4301 		goto done;
4302 done:
4303 	if (s->f && fflush(s->f) != 0 && err == NULL)
4304 		err = got_error_from_errno("fflush");
4305 	return err;
4306 }
4307 
4308 static void
4309 diff_view_indicate_progress(struct tog_view *view)
4310 {
4311 	mvwaddstr(view->window, 0, 0, "diffing...");
4312 	update_panels();
4313 	doupdate();
4314 }
4315 
4316 static const struct got_error *
4317 search_start_diff_view(struct tog_view *view)
4318 {
4319 	struct tog_diff_view_state *s = &view->state.diff;
4320 
4321 	s->matched_line = 0;
4322 	return NULL;
4323 }
4324 
4325 static const struct got_error *
4326 search_next_diff_view(struct tog_view *view)
4327 {
4328 	struct tog_diff_view_state *s = &view->state.diff;
4329 	const struct got_error *err = NULL;
4330 	int lineno;
4331 	char *line = NULL;
4332 	size_t linesize = 0;
4333 	ssize_t linelen;
4334 
4335 	if (!view->searching) {
4336 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4337 		return NULL;
4338 	}
4339 
4340 	if (s->matched_line) {
4341 		if (view->searching == TOG_SEARCH_FORWARD)
4342 			lineno = s->matched_line + 1;
4343 		else
4344 			lineno = s->matched_line - 1;
4345 	} else
4346 		lineno = s->first_displayed_line;
4347 
4348 	while (1) {
4349 		off_t offset;
4350 
4351 		if (lineno <= 0 || lineno > s->nlines) {
4352 			if (s->matched_line == 0) {
4353 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4354 				break;
4355 			}
4356 
4357 			if (view->searching == TOG_SEARCH_FORWARD)
4358 				lineno = 1;
4359 			else
4360 				lineno = s->nlines;
4361 		}
4362 
4363 		offset = s->line_offsets[lineno - 1];
4364 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4365 			free(line);
4366 			return got_error_from_errno("fseeko");
4367 		}
4368 		linelen = getline(&line, &linesize, s->f);
4369 		if (linelen != -1) {
4370 			char *exstr;
4371 			err = expand_tab(&exstr, line);
4372 			if (err)
4373 				break;
4374 			if (match_line(exstr, &view->regex, 1,
4375 			    &view->regmatch)) {
4376 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4377 				s->matched_line = lineno;
4378 				free(exstr);
4379 				break;
4380 			}
4381 			free(exstr);
4382 		}
4383 		if (view->searching == TOG_SEARCH_FORWARD)
4384 			lineno++;
4385 		else
4386 			lineno--;
4387 	}
4388 	free(line);
4389 
4390 	if (s->matched_line) {
4391 		s->first_displayed_line = s->matched_line;
4392 		s->selected_line = 1;
4393 	}
4394 
4395 	return err;
4396 }
4397 
4398 static const struct got_error *
4399 close_diff_view(struct tog_view *view)
4400 {
4401 	const struct got_error *err = NULL;
4402 	struct tog_diff_view_state *s = &view->state.diff;
4403 
4404 	free(s->id1);
4405 	s->id1 = NULL;
4406 	free(s->id2);
4407 	s->id2 = NULL;
4408 	if (s->f && fclose(s->f) == EOF)
4409 		err = got_error_from_errno("fclose");
4410 	s->f = NULL;
4411 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4412 		err = got_error_from_errno("fclose");
4413 	s->f1 = NULL;
4414 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4415 		err = got_error_from_errno("fclose");
4416 	s->f2 = NULL;
4417 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4418 		err = got_error_from_errno("close");
4419 	s->fd1 = -1;
4420 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4421 		err = got_error_from_errno("close");
4422 	s->fd2 = -1;
4423 	free_colors(&s->colors);
4424 	free(s->line_offsets);
4425 	s->line_offsets = NULL;
4426 	s->nlines = 0;
4427 	return err;
4428 }
4429 
4430 static const struct got_error *
4431 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4432     struct got_object_id *id2, const char *label1, const char *label2,
4433     int diff_context, int ignore_whitespace, int force_text_diff,
4434     struct tog_view *parent_view, struct got_repository *repo)
4435 {
4436 	const struct got_error *err;
4437 	struct tog_diff_view_state *s = &view->state.diff;
4438 
4439 	memset(s, 0, sizeof(*s));
4440 	s->fd1 = -1;
4441 	s->fd2 = -1;
4442 
4443 	if (id1 != NULL && id2 != NULL) {
4444 	    int type1, type2;
4445 	    err = got_object_get_type(&type1, repo, id1);
4446 	    if (err)
4447 		return err;
4448 	    err = got_object_get_type(&type2, repo, id2);
4449 	    if (err)
4450 		return err;
4451 
4452 	    if (type1 != type2)
4453 		return got_error(GOT_ERR_OBJ_TYPE);
4454 	}
4455 	s->first_displayed_line = 1;
4456 	s->last_displayed_line = view->nlines;
4457 	s->selected_line = 1;
4458 	s->repo = repo;
4459 	s->id1 = id1;
4460 	s->id2 = id2;
4461 	s->label1 = label1;
4462 	s->label2 = label2;
4463 
4464 	if (id1) {
4465 		s->id1 = got_object_id_dup(id1);
4466 		if (s->id1 == NULL)
4467 			return got_error_from_errno("got_object_id_dup");
4468 	} else
4469 		s->id1 = NULL;
4470 
4471 	s->id2 = got_object_id_dup(id2);
4472 	if (s->id2 == NULL) {
4473 		err = got_error_from_errno("got_object_id_dup");
4474 		goto done;
4475 	}
4476 
4477 	s->f1 = got_opentemp();
4478 	if (s->f1 == NULL) {
4479 		err = got_error_from_errno("got_opentemp");
4480 		goto done;
4481 	}
4482 
4483 	s->f2 = got_opentemp();
4484 	if (s->f2 == NULL) {
4485 		err = got_error_from_errno("got_opentemp");
4486 		goto done;
4487 	}
4488 
4489 	s->fd1 = got_opentempfd();
4490 	if (s->fd1 == -1) {
4491 		err = got_error_from_errno("got_opentempfd");
4492 		goto done;
4493 	}
4494 
4495 	s->fd2 = got_opentempfd();
4496 	if (s->fd2 == -1) {
4497 		err = got_error_from_errno("got_opentempfd");
4498 		goto done;
4499 	}
4500 
4501 	s->first_displayed_line = 1;
4502 	s->last_displayed_line = view->nlines;
4503 	s->diff_context = diff_context;
4504 	s->ignore_whitespace = ignore_whitespace;
4505 	s->force_text_diff = force_text_diff;
4506 	s->parent_view = parent_view;
4507 	s->repo = repo;
4508 
4509 	STAILQ_INIT(&s->colors);
4510 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4511 		err = add_color(&s->colors,
4512 		    "^-", TOG_COLOR_DIFF_MINUS,
4513 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4514 		if (err)
4515 			goto done;
4516 		err = add_color(&s->colors, "^\\+",
4517 		    TOG_COLOR_DIFF_PLUS,
4518 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4519 		if (err)
4520 			goto done;
4521 		err = add_color(&s->colors,
4522 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4523 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4524 		if (err)
4525 			goto done;
4526 
4527 		err = add_color(&s->colors,
4528 		    "^(commit [0-9a-f]|parent [0-9]|"
4529 		    "(blob|file|tree|commit) [-+] |"
4530 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4531 		    get_color_value("TOG_COLOR_DIFF_META"));
4532 		if (err)
4533 			goto done;
4534 
4535 		err = add_color(&s->colors,
4536 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4537 		    get_color_value("TOG_COLOR_AUTHOR"));
4538 		if (err)
4539 			goto done;
4540 
4541 		err = add_color(&s->colors,
4542 		    "^date: ", TOG_COLOR_DATE,
4543 		    get_color_value("TOG_COLOR_DATE"));
4544 		if (err)
4545 			goto done;
4546 	}
4547 
4548 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4549 	    view_is_splitscreen(view))
4550 		show_log_view(parent_view); /* draw border */
4551 	diff_view_indicate_progress(view);
4552 
4553 	err = create_diff(s);
4554 
4555 	view->show = show_diff_view;
4556 	view->input = input_diff_view;
4557 	view->reset = reset_diff_view;
4558 	view->close = close_diff_view;
4559 	view->search_start = search_start_diff_view;
4560 	view->search_next = search_next_diff_view;
4561 done:
4562 	if (err)
4563 		close_diff_view(view);
4564 	return err;
4565 }
4566 
4567 static const struct got_error *
4568 show_diff_view(struct tog_view *view)
4569 {
4570 	const struct got_error *err;
4571 	struct tog_diff_view_state *s = &view->state.diff;
4572 	char *id_str1 = NULL, *id_str2, *header;
4573 	const char *label1, *label2;
4574 
4575 	if (s->id1) {
4576 		err = got_object_id_str(&id_str1, s->id1);
4577 		if (err)
4578 			return err;
4579 		label1 = s->label1 ? : id_str1;
4580 	} else
4581 		label1 = "/dev/null";
4582 
4583 	err = got_object_id_str(&id_str2, s->id2);
4584 	if (err)
4585 		return err;
4586 	label2 = s->label2 ? : id_str2;
4587 
4588 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4589 		err = got_error_from_errno("asprintf");
4590 		free(id_str1);
4591 		free(id_str2);
4592 		return err;
4593 	}
4594 	free(id_str1);
4595 	free(id_str2);
4596 
4597 	err = draw_file(view, header);
4598 	free(header);
4599 	return err;
4600 }
4601 
4602 static const struct got_error *
4603 set_selected_commit(struct tog_diff_view_state *s,
4604     struct commit_queue_entry *entry)
4605 {
4606 	const struct got_error *err;
4607 	const struct got_object_id_queue *parent_ids;
4608 	struct got_commit_object *selected_commit;
4609 	struct got_object_qid *pid;
4610 
4611 	free(s->id2);
4612 	s->id2 = got_object_id_dup(entry->id);
4613 	if (s->id2 == NULL)
4614 		return got_error_from_errno("got_object_id_dup");
4615 
4616 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4617 	if (err)
4618 		return err;
4619 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4620 	free(s->id1);
4621 	pid = STAILQ_FIRST(parent_ids);
4622 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4623 	got_object_commit_close(selected_commit);
4624 	return NULL;
4625 }
4626 
4627 static const struct got_error *
4628 reset_diff_view(struct tog_view *view)
4629 {
4630 	struct tog_diff_view_state *s = &view->state.diff;
4631 
4632 	view->count = 0;
4633 	wclear(view->window);
4634 	s->first_displayed_line = 1;
4635 	s->last_displayed_line = view->nlines;
4636 	s->matched_line = 0;
4637 	diff_view_indicate_progress(view);
4638 	return create_diff(s);
4639 }
4640 
4641 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4642     int, int, int);
4643 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4644     int, int);
4645 
4646 static const struct got_error *
4647 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4648 {
4649 	const struct got_error *err = NULL;
4650 	struct tog_diff_view_state *s = &view->state.diff;
4651 	struct tog_log_view_state *ls;
4652 	struct commit_queue_entry *old_selected_entry;
4653 	char *line = NULL;
4654 	size_t linesize = 0;
4655 	ssize_t linelen;
4656 	int i, nscroll = view->nlines - 1, up = 0;
4657 
4658 	switch (ch) {
4659 	case '0':
4660 		view->x = 0;
4661 		break;
4662 	case '$':
4663 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4664 		view->count = 0;
4665 		break;
4666 	case KEY_RIGHT:
4667 	case 'l':
4668 		if (view->x + view->ncols / 3 < view->maxx)
4669 			view->x += 2;  /* move two columns right */
4670 		else
4671 			view->count = 0;
4672 		break;
4673 	case KEY_LEFT:
4674 	case 'h':
4675 		view->x -= MIN(view->x, 2);  /* move two columns back */
4676 		if (view->x <= 0)
4677 			view->count = 0;
4678 		break;
4679 	case 'a':
4680 	case 'w':
4681 		if (ch == 'a')
4682 			s->force_text_diff = !s->force_text_diff;
4683 		if (ch == 'w')
4684 			s->ignore_whitespace = !s->ignore_whitespace;
4685 		err = reset_diff_view(view);
4686 		break;
4687 	case 'g':
4688 	case KEY_HOME:
4689 		s->first_displayed_line = 1;
4690 		view->count = 0;
4691 		break;
4692 	case 'G':
4693 	case KEY_END:
4694 		view->count = 0;
4695 		if (s->eof)
4696 			break;
4697 
4698 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4699 		s->eof = 1;
4700 		break;
4701 	case 'k':
4702 	case KEY_UP:
4703 	case CTRL('p'):
4704 		if (s->first_displayed_line > 1)
4705 			s->first_displayed_line--;
4706 		else
4707 			view->count = 0;
4708 		break;
4709 	case CTRL('u'):
4710 	case 'u':
4711 		nscroll /= 2;
4712 		/* FALL THROUGH */
4713 	case KEY_PPAGE:
4714 	case CTRL('b'):
4715 	case 'b':
4716 		if (s->first_displayed_line == 1) {
4717 			view->count = 0;
4718 			break;
4719 		}
4720 		i = 0;
4721 		while (i++ < nscroll && s->first_displayed_line > 1)
4722 			s->first_displayed_line--;
4723 		break;
4724 	case 'j':
4725 	case KEY_DOWN:
4726 	case CTRL('n'):
4727 		if (!s->eof)
4728 			s->first_displayed_line++;
4729 		else
4730 			view->count = 0;
4731 		break;
4732 	case CTRL('d'):
4733 	case 'd':
4734 		nscroll /= 2;
4735 		/* FALL THROUGH */
4736 	case KEY_NPAGE:
4737 	case CTRL('f'):
4738 	case 'f':
4739 	case ' ':
4740 		if (s->eof) {
4741 			view->count = 0;
4742 			break;
4743 		}
4744 		i = 0;
4745 		while (!s->eof && i++ < nscroll) {
4746 			linelen = getline(&line, &linesize, s->f);
4747 			s->first_displayed_line++;
4748 			if (linelen == -1) {
4749 				if (feof(s->f)) {
4750 					s->eof = 1;
4751 				} else
4752 					err = got_ferror(s->f, GOT_ERR_IO);
4753 				break;
4754 			}
4755 		}
4756 		free(line);
4757 		break;
4758 	case '[':
4759 		if (s->diff_context > 0) {
4760 			s->diff_context--;
4761 			s->matched_line = 0;
4762 			diff_view_indicate_progress(view);
4763 			err = create_diff(s);
4764 			if (s->first_displayed_line + view->nlines - 1 >
4765 			    s->nlines) {
4766 				s->first_displayed_line = 1;
4767 				s->last_displayed_line = view->nlines;
4768 			}
4769 		} else
4770 			view->count = 0;
4771 		break;
4772 	case ']':
4773 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4774 			s->diff_context++;
4775 			s->matched_line = 0;
4776 			diff_view_indicate_progress(view);
4777 			err = create_diff(s);
4778 		} else
4779 			view->count = 0;
4780 		break;
4781 	case '<':
4782 	case ',':
4783 		up = 1;
4784 		/* FALL THROUGH */
4785 	case '>':
4786 	case '.':
4787 		if (s->parent_view == NULL) {
4788 			view->count = 0;
4789 			break;
4790 		}
4791 		s->parent_view->count = view->count;
4792 
4793 		if (s->parent_view->type == TOG_VIEW_LOG) {
4794 			ls = &s->parent_view->state.log;
4795 			old_selected_entry = ls->selected_entry;
4796 
4797 			err = input_log_view(NULL, s->parent_view,
4798 			    up ? KEY_UP : KEY_DOWN);
4799 			if (err)
4800 				break;
4801 			view->count = s->parent_view->count;
4802 
4803 			if (old_selected_entry == ls->selected_entry)
4804 				break;
4805 
4806 			err = set_selected_commit(s, ls->selected_entry);
4807 			if (err)
4808 				break;
4809 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4810 			struct tog_blame_view_state *bs;
4811 			struct got_object_id *id, *prev_id;
4812 
4813 			bs = &s->parent_view->state.blame;
4814 			prev_id = get_annotation_for_line(bs->blame.lines,
4815 			    bs->blame.nlines, bs->last_diffed_line);
4816 
4817 			err = input_blame_view(&view, s->parent_view,
4818 			    up ? KEY_UP : KEY_DOWN);
4819 			if (err)
4820 				break;
4821 			view->count = s->parent_view->count;
4822 
4823 			if (prev_id == NULL)
4824 				break;
4825 			id = get_selected_commit_id(bs->blame.lines,
4826 			    bs->blame.nlines, bs->first_displayed_line,
4827 			    bs->selected_line);
4828 			if (id == NULL)
4829 				break;
4830 
4831 			if (!got_object_id_cmp(prev_id, id))
4832 				break;
4833 
4834 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4835 			if (err)
4836 				break;
4837 		}
4838 		s->first_displayed_line = 1;
4839 		s->last_displayed_line = view->nlines;
4840 		s->matched_line = 0;
4841 		view->x = 0;
4842 
4843 		diff_view_indicate_progress(view);
4844 		err = create_diff(s);
4845 		break;
4846 	default:
4847 		view->count = 0;
4848 		break;
4849 	}
4850 
4851 	return err;
4852 }
4853 
4854 static const struct got_error *
4855 cmd_diff(int argc, char *argv[])
4856 {
4857 	const struct got_error *error = NULL;
4858 	struct got_repository *repo = NULL;
4859 	struct got_worktree *worktree = NULL;
4860 	struct got_object_id *id1 = NULL, *id2 = NULL;
4861 	char *repo_path = NULL, *cwd = NULL;
4862 	char *id_str1 = NULL, *id_str2 = NULL;
4863 	char *label1 = NULL, *label2 = NULL;
4864 	int diff_context = 3, ignore_whitespace = 0;
4865 	int ch, force_text_diff = 0;
4866 	const char *errstr;
4867 	struct tog_view *view;
4868 	int *pack_fds = NULL;
4869 
4870 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4871 		switch (ch) {
4872 		case 'a':
4873 			force_text_diff = 1;
4874 			break;
4875 		case 'C':
4876 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4877 			    &errstr);
4878 			if (errstr != NULL)
4879 				errx(1, "number of context lines is %s: %s",
4880 				    errstr, errstr);
4881 			break;
4882 		case 'r':
4883 			repo_path = realpath(optarg, NULL);
4884 			if (repo_path == NULL)
4885 				return got_error_from_errno2("realpath",
4886 				    optarg);
4887 			got_path_strip_trailing_slashes(repo_path);
4888 			break;
4889 		case 'w':
4890 			ignore_whitespace = 1;
4891 			break;
4892 		default:
4893 			usage_diff();
4894 			/* NOTREACHED */
4895 		}
4896 	}
4897 
4898 	argc -= optind;
4899 	argv += optind;
4900 
4901 	if (argc == 0) {
4902 		usage_diff(); /* TODO show local worktree changes */
4903 	} else if (argc == 2) {
4904 		id_str1 = argv[0];
4905 		id_str2 = argv[1];
4906 	} else
4907 		usage_diff();
4908 
4909 	error = got_repo_pack_fds_open(&pack_fds);
4910 	if (error)
4911 		goto done;
4912 
4913 	if (repo_path == NULL) {
4914 		cwd = getcwd(NULL, 0);
4915 		if (cwd == NULL)
4916 			return got_error_from_errno("getcwd");
4917 		error = got_worktree_open(&worktree, cwd);
4918 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4919 			goto done;
4920 		if (worktree)
4921 			repo_path =
4922 			    strdup(got_worktree_get_repo_path(worktree));
4923 		else
4924 			repo_path = strdup(cwd);
4925 		if (repo_path == NULL) {
4926 			error = got_error_from_errno("strdup");
4927 			goto done;
4928 		}
4929 	}
4930 
4931 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4932 	if (error)
4933 		goto done;
4934 
4935 	init_curses();
4936 
4937 	error = apply_unveil(got_repo_get_path(repo), NULL);
4938 	if (error)
4939 		goto done;
4940 
4941 	error = tog_load_refs(repo, 0);
4942 	if (error)
4943 		goto done;
4944 
4945 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4946 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4947 	if (error)
4948 		goto done;
4949 
4950 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4951 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4952 	if (error)
4953 		goto done;
4954 
4955 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4956 	if (view == NULL) {
4957 		error = got_error_from_errno("view_open");
4958 		goto done;
4959 	}
4960 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4961 	    ignore_whitespace, force_text_diff, NULL,  repo);
4962 	if (error)
4963 		goto done;
4964 	error = view_loop(view);
4965 done:
4966 	free(label1);
4967 	free(label2);
4968 	free(repo_path);
4969 	free(cwd);
4970 	if (repo) {
4971 		const struct got_error *close_err = got_repo_close(repo);
4972 		if (error == NULL)
4973 			error = close_err;
4974 	}
4975 	if (worktree)
4976 		got_worktree_close(worktree);
4977 	if (pack_fds) {
4978 		const struct got_error *pack_err =
4979 		    got_repo_pack_fds_close(pack_fds);
4980 		if (error == NULL)
4981 			error = pack_err;
4982 	}
4983 	tog_free_refs();
4984 	return error;
4985 }
4986 
4987 __dead static void
4988 usage_blame(void)
4989 {
4990 	endwin();
4991 	fprintf(stderr,
4992 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
4993 	    getprogname());
4994 	exit(1);
4995 }
4996 
4997 struct tog_blame_line {
4998 	int annotated;
4999 	struct got_object_id *id;
5000 };
5001 
5002 static const struct got_error *
5003 draw_blame(struct tog_view *view)
5004 {
5005 	struct tog_blame_view_state *s = &view->state.blame;
5006 	struct tog_blame *blame = &s->blame;
5007 	regmatch_t *regmatch = &view->regmatch;
5008 	const struct got_error *err;
5009 	int lineno = 0, nprinted = 0;
5010 	char *line = NULL;
5011 	size_t linesize = 0;
5012 	ssize_t linelen;
5013 	wchar_t *wline;
5014 	int width;
5015 	struct tog_blame_line *blame_line;
5016 	struct got_object_id *prev_id = NULL;
5017 	char *id_str;
5018 	struct tog_color *tc;
5019 
5020 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5021 	if (err)
5022 		return err;
5023 
5024 	rewind(blame->f);
5025 	werase(view->window);
5026 
5027 	if (asprintf(&line, "commit %s", id_str) == -1) {
5028 		err = got_error_from_errno("asprintf");
5029 		free(id_str);
5030 		return err;
5031 	}
5032 
5033 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5034 	free(line);
5035 	line = NULL;
5036 	if (err)
5037 		return err;
5038 	if (view_needs_focus_indication(view))
5039 		wstandout(view->window);
5040 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5041 	if (tc)
5042 		wattr_on(view->window,
5043 		    COLOR_PAIR(tc->colorpair), NULL);
5044 	waddwstr(view->window, wline);
5045 	if (tc)
5046 		wattr_off(view->window,
5047 		    COLOR_PAIR(tc->colorpair), NULL);
5048 	if (view_needs_focus_indication(view))
5049 		wstandend(view->window);
5050 	free(wline);
5051 	wline = NULL;
5052 	if (width < view->ncols - 1)
5053 		waddch(view->window, '\n');
5054 
5055 	if (asprintf(&line, "[%d/%d] %s%s",
5056 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5057 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5058 		free(id_str);
5059 		return got_error_from_errno("asprintf");
5060 	}
5061 	free(id_str);
5062 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5063 	free(line);
5064 	line = NULL;
5065 	if (err)
5066 		return err;
5067 	waddwstr(view->window, wline);
5068 	free(wline);
5069 	wline = NULL;
5070 	if (width < view->ncols - 1)
5071 		waddch(view->window, '\n');
5072 
5073 	s->eof = 0;
5074 	view->maxx = 0;
5075 	while (nprinted < view->nlines - 2) {
5076 		linelen = getline(&line, &linesize, blame->f);
5077 		if (linelen == -1) {
5078 			if (feof(blame->f)) {
5079 				s->eof = 1;
5080 				break;
5081 			}
5082 			free(line);
5083 			return got_ferror(blame->f, GOT_ERR_IO);
5084 		}
5085 		if (++lineno < s->first_displayed_line)
5086 			continue;
5087 
5088 		/* Set view->maxx based on full line length. */
5089 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5090 		if (err) {
5091 			free(line);
5092 			return err;
5093 		}
5094 		free(wline);
5095 		wline = NULL;
5096 		view->maxx = MAX(view->maxx, width);
5097 
5098 		if (nprinted == s->selected_line - 1)
5099 			wstandout(view->window);
5100 
5101 		if (blame->nlines > 0) {
5102 			blame_line = &blame->lines[lineno - 1];
5103 			if (blame_line->annotated && prev_id &&
5104 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5105 			    !(nprinted == s->selected_line - 1)) {
5106 				waddstr(view->window, "        ");
5107 			} else if (blame_line->annotated) {
5108 				char *id_str;
5109 				err = got_object_id_str(&id_str,
5110 				    blame_line->id);
5111 				if (err) {
5112 					free(line);
5113 					return err;
5114 				}
5115 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5116 				if (tc)
5117 					wattr_on(view->window,
5118 					    COLOR_PAIR(tc->colorpair), NULL);
5119 				wprintw(view->window, "%.8s", id_str);
5120 				if (tc)
5121 					wattr_off(view->window,
5122 					    COLOR_PAIR(tc->colorpair), NULL);
5123 				free(id_str);
5124 				prev_id = blame_line->id;
5125 			} else {
5126 				waddstr(view->window, "........");
5127 				prev_id = NULL;
5128 			}
5129 		} else {
5130 			waddstr(view->window, "........");
5131 			prev_id = NULL;
5132 		}
5133 
5134 		if (nprinted == s->selected_line - 1)
5135 			wstandend(view->window);
5136 		waddstr(view->window, " ");
5137 
5138 		if (view->ncols <= 9) {
5139 			width = 9;
5140 		} else if (s->first_displayed_line + nprinted ==
5141 		    s->matched_line &&
5142 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5143 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5144 			    view->window, view->x, regmatch);
5145 			if (err) {
5146 				free(line);
5147 				return err;
5148 			}
5149 			width += 9;
5150 		} else {
5151 			int skip;
5152 			err = format_line(&wline, &width, &skip, line,
5153 			    view->x, view->ncols - 9, 9, 1);
5154 			if (err) {
5155 				free(line);
5156 				return err;
5157 			}
5158 			waddwstr(view->window, &wline[skip]);
5159 			width += 9;
5160 			free(wline);
5161 			wline = NULL;
5162 		}
5163 
5164 		if (width <= view->ncols - 1)
5165 			waddch(view->window, '\n');
5166 		if (++nprinted == 1)
5167 			s->first_displayed_line = lineno;
5168 	}
5169 	free(line);
5170 	s->last_displayed_line = lineno;
5171 
5172 	view_border(view);
5173 
5174 	return NULL;
5175 }
5176 
5177 static const struct got_error *
5178 blame_cb(void *arg, int nlines, int lineno,
5179     struct got_commit_object *commit, struct got_object_id *id)
5180 {
5181 	const struct got_error *err = NULL;
5182 	struct tog_blame_cb_args *a = arg;
5183 	struct tog_blame_line *line;
5184 	int errcode;
5185 
5186 	if (nlines != a->nlines ||
5187 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5188 		return got_error(GOT_ERR_RANGE);
5189 
5190 	errcode = pthread_mutex_lock(&tog_mutex);
5191 	if (errcode)
5192 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5193 
5194 	if (*a->quit) {	/* user has quit the blame view */
5195 		err = got_error(GOT_ERR_ITER_COMPLETED);
5196 		goto done;
5197 	}
5198 
5199 	if (lineno == -1)
5200 		goto done; /* no change in this commit */
5201 
5202 	line = &a->lines[lineno - 1];
5203 	if (line->annotated)
5204 		goto done;
5205 
5206 	line->id = got_object_id_dup(id);
5207 	if (line->id == NULL) {
5208 		err = got_error_from_errno("got_object_id_dup");
5209 		goto done;
5210 	}
5211 	line->annotated = 1;
5212 done:
5213 	errcode = pthread_mutex_unlock(&tog_mutex);
5214 	if (errcode)
5215 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5216 	return err;
5217 }
5218 
5219 static void *
5220 blame_thread(void *arg)
5221 {
5222 	const struct got_error *err, *close_err;
5223 	struct tog_blame_thread_args *ta = arg;
5224 	struct tog_blame_cb_args *a = ta->cb_args;
5225 	int errcode, fd1 = -1, fd2 = -1;
5226 	FILE *f1 = NULL, *f2 = NULL;
5227 
5228 	fd1 = got_opentempfd();
5229 	if (fd1 == -1)
5230 		return (void *)got_error_from_errno("got_opentempfd");
5231 
5232 	fd2 = got_opentempfd();
5233 	if (fd2 == -1) {
5234 		err = got_error_from_errno("got_opentempfd");
5235 		goto done;
5236 	}
5237 
5238 	f1 = got_opentemp();
5239 	if (f1 == NULL) {
5240 		err = (void *)got_error_from_errno("got_opentemp");
5241 		goto done;
5242 	}
5243 	f2 = got_opentemp();
5244 	if (f2 == NULL) {
5245 		err = (void *)got_error_from_errno("got_opentemp");
5246 		goto done;
5247 	}
5248 
5249 	err = block_signals_used_by_main_thread();
5250 	if (err)
5251 		goto done;
5252 
5253 	err = got_blame(ta->path, a->commit_id, ta->repo,
5254 	    tog_diff_algo, blame_cb, ta->cb_args,
5255 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5256 	if (err && err->code == GOT_ERR_CANCELLED)
5257 		err = NULL;
5258 
5259 	errcode = pthread_mutex_lock(&tog_mutex);
5260 	if (errcode) {
5261 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5262 		goto done;
5263 	}
5264 
5265 	close_err = got_repo_close(ta->repo);
5266 	if (err == NULL)
5267 		err = close_err;
5268 	ta->repo = NULL;
5269 	*ta->complete = 1;
5270 
5271 	errcode = pthread_mutex_unlock(&tog_mutex);
5272 	if (errcode && err == NULL)
5273 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5274 
5275 done:
5276 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5277 		err = got_error_from_errno("close");
5278 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5279 		err = got_error_from_errno("close");
5280 	if (f1 && fclose(f1) == EOF && err == NULL)
5281 		err = got_error_from_errno("fclose");
5282 	if (f2 && fclose(f2) == EOF && err == NULL)
5283 		err = got_error_from_errno("fclose");
5284 
5285 	return (void *)err;
5286 }
5287 
5288 static struct got_object_id *
5289 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5290     int first_displayed_line, int selected_line)
5291 {
5292 	struct tog_blame_line *line;
5293 
5294 	if (nlines <= 0)
5295 		return NULL;
5296 
5297 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5298 	if (!line->annotated)
5299 		return NULL;
5300 
5301 	return line->id;
5302 }
5303 
5304 static struct got_object_id *
5305 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5306     int lineno)
5307 {
5308 	struct tog_blame_line *line;
5309 
5310 	if (nlines <= 0 || lineno >= nlines)
5311 		return NULL;
5312 
5313 	line = &lines[lineno - 1];
5314 	if (!line->annotated)
5315 		return NULL;
5316 
5317 	return line->id;
5318 }
5319 
5320 static const struct got_error *
5321 stop_blame(struct tog_blame *blame)
5322 {
5323 	const struct got_error *err = NULL;
5324 	int i;
5325 
5326 	if (blame->thread) {
5327 		int errcode;
5328 		errcode = pthread_mutex_unlock(&tog_mutex);
5329 		if (errcode)
5330 			return got_error_set_errno(errcode,
5331 			    "pthread_mutex_unlock");
5332 		errcode = pthread_join(blame->thread, (void **)&err);
5333 		if (errcode)
5334 			return got_error_set_errno(errcode, "pthread_join");
5335 		errcode = pthread_mutex_lock(&tog_mutex);
5336 		if (errcode)
5337 			return got_error_set_errno(errcode,
5338 			    "pthread_mutex_lock");
5339 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5340 			err = NULL;
5341 		blame->thread = 0; //NULL;
5342 	}
5343 	if (blame->thread_args.repo) {
5344 		const struct got_error *close_err;
5345 		close_err = got_repo_close(blame->thread_args.repo);
5346 		if (err == NULL)
5347 			err = close_err;
5348 		blame->thread_args.repo = NULL;
5349 	}
5350 	if (blame->f) {
5351 		if (fclose(blame->f) == EOF && err == NULL)
5352 			err = got_error_from_errno("fclose");
5353 		blame->f = NULL;
5354 	}
5355 	if (blame->lines) {
5356 		for (i = 0; i < blame->nlines; i++)
5357 			free(blame->lines[i].id);
5358 		free(blame->lines);
5359 		blame->lines = NULL;
5360 	}
5361 	free(blame->cb_args.commit_id);
5362 	blame->cb_args.commit_id = NULL;
5363 	if (blame->pack_fds) {
5364 		const struct got_error *pack_err =
5365 		    got_repo_pack_fds_close(blame->pack_fds);
5366 		if (err == NULL)
5367 			err = pack_err;
5368 		blame->pack_fds = NULL;
5369 	}
5370 	return err;
5371 }
5372 
5373 static const struct got_error *
5374 cancel_blame_view(void *arg)
5375 {
5376 	const struct got_error *err = NULL;
5377 	int *done = arg;
5378 	int errcode;
5379 
5380 	errcode = pthread_mutex_lock(&tog_mutex);
5381 	if (errcode)
5382 		return got_error_set_errno(errcode,
5383 		    "pthread_mutex_unlock");
5384 
5385 	if (*done)
5386 		err = got_error(GOT_ERR_CANCELLED);
5387 
5388 	errcode = pthread_mutex_unlock(&tog_mutex);
5389 	if (errcode)
5390 		return got_error_set_errno(errcode,
5391 		    "pthread_mutex_lock");
5392 
5393 	return err;
5394 }
5395 
5396 static const struct got_error *
5397 run_blame(struct tog_view *view)
5398 {
5399 	struct tog_blame_view_state *s = &view->state.blame;
5400 	struct tog_blame *blame = &s->blame;
5401 	const struct got_error *err = NULL;
5402 	struct got_commit_object *commit = NULL;
5403 	struct got_blob_object *blob = NULL;
5404 	struct got_repository *thread_repo = NULL;
5405 	struct got_object_id *obj_id = NULL;
5406 	int obj_type, fd = -1;
5407 	int *pack_fds = NULL;
5408 
5409 	err = got_object_open_as_commit(&commit, s->repo,
5410 	    &s->blamed_commit->id);
5411 	if (err)
5412 		return err;
5413 
5414 	fd = got_opentempfd();
5415 	if (fd == -1) {
5416 		err = got_error_from_errno("got_opentempfd");
5417 		goto done;
5418 	}
5419 
5420 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5421 	if (err)
5422 		goto done;
5423 
5424 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5425 	if (err)
5426 		goto done;
5427 
5428 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5429 		err = got_error(GOT_ERR_OBJ_TYPE);
5430 		goto done;
5431 	}
5432 
5433 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5434 	if (err)
5435 		goto done;
5436 	blame->f = got_opentemp();
5437 	if (blame->f == NULL) {
5438 		err = got_error_from_errno("got_opentemp");
5439 		goto done;
5440 	}
5441 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5442 	    &blame->line_offsets, blame->f, blob);
5443 	if (err)
5444 		goto done;
5445 	if (blame->nlines == 0) {
5446 		s->blame_complete = 1;
5447 		goto done;
5448 	}
5449 
5450 	/* Don't include \n at EOF in the blame line count. */
5451 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5452 		blame->nlines--;
5453 
5454 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5455 	if (blame->lines == NULL) {
5456 		err = got_error_from_errno("calloc");
5457 		goto done;
5458 	}
5459 
5460 	err = got_repo_pack_fds_open(&pack_fds);
5461 	if (err)
5462 		goto done;
5463 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5464 	    pack_fds);
5465 	if (err)
5466 		goto done;
5467 
5468 	blame->pack_fds = pack_fds;
5469 	blame->cb_args.view = view;
5470 	blame->cb_args.lines = blame->lines;
5471 	blame->cb_args.nlines = blame->nlines;
5472 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5473 	if (blame->cb_args.commit_id == NULL) {
5474 		err = got_error_from_errno("got_object_id_dup");
5475 		goto done;
5476 	}
5477 	blame->cb_args.quit = &s->done;
5478 
5479 	blame->thread_args.path = s->path;
5480 	blame->thread_args.repo = thread_repo;
5481 	blame->thread_args.cb_args = &blame->cb_args;
5482 	blame->thread_args.complete = &s->blame_complete;
5483 	blame->thread_args.cancel_cb = cancel_blame_view;
5484 	blame->thread_args.cancel_arg = &s->done;
5485 	s->blame_complete = 0;
5486 
5487 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5488 		s->first_displayed_line = 1;
5489 		s->last_displayed_line = view->nlines;
5490 		s->selected_line = 1;
5491 	}
5492 	s->matched_line = 0;
5493 
5494 done:
5495 	if (commit)
5496 		got_object_commit_close(commit);
5497 	if (fd != -1 && close(fd) == -1 && err == NULL)
5498 		err = got_error_from_errno("close");
5499 	if (blob)
5500 		got_object_blob_close(blob);
5501 	free(obj_id);
5502 	if (err)
5503 		stop_blame(blame);
5504 	return err;
5505 }
5506 
5507 static const struct got_error *
5508 open_blame_view(struct tog_view *view, char *path,
5509     struct got_object_id *commit_id, struct got_repository *repo)
5510 {
5511 	const struct got_error *err = NULL;
5512 	struct tog_blame_view_state *s = &view->state.blame;
5513 
5514 	STAILQ_INIT(&s->blamed_commits);
5515 
5516 	s->path = strdup(path);
5517 	if (s->path == NULL)
5518 		return got_error_from_errno("strdup");
5519 
5520 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5521 	if (err) {
5522 		free(s->path);
5523 		return err;
5524 	}
5525 
5526 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5527 	s->first_displayed_line = 1;
5528 	s->last_displayed_line = view->nlines;
5529 	s->selected_line = 1;
5530 	s->blame_complete = 0;
5531 	s->repo = repo;
5532 	s->commit_id = commit_id;
5533 	memset(&s->blame, 0, sizeof(s->blame));
5534 
5535 	STAILQ_INIT(&s->colors);
5536 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5537 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5538 		    get_color_value("TOG_COLOR_COMMIT"));
5539 		if (err)
5540 			return err;
5541 	}
5542 
5543 	view->show = show_blame_view;
5544 	view->input = input_blame_view;
5545 	view->reset = reset_blame_view;
5546 	view->close = close_blame_view;
5547 	view->search_start = search_start_blame_view;
5548 	view->search_next = search_next_blame_view;
5549 
5550 	return run_blame(view);
5551 }
5552 
5553 static const struct got_error *
5554 close_blame_view(struct tog_view *view)
5555 {
5556 	const struct got_error *err = NULL;
5557 	struct tog_blame_view_state *s = &view->state.blame;
5558 
5559 	if (s->blame.thread)
5560 		err = stop_blame(&s->blame);
5561 
5562 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5563 		struct got_object_qid *blamed_commit;
5564 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5565 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5566 		got_object_qid_free(blamed_commit);
5567 	}
5568 
5569 	free(s->path);
5570 	free_colors(&s->colors);
5571 	return err;
5572 }
5573 
5574 static const struct got_error *
5575 search_start_blame_view(struct tog_view *view)
5576 {
5577 	struct tog_blame_view_state *s = &view->state.blame;
5578 
5579 	s->matched_line = 0;
5580 	return NULL;
5581 }
5582 
5583 static const struct got_error *
5584 search_next_blame_view(struct tog_view *view)
5585 {
5586 	struct tog_blame_view_state *s = &view->state.blame;
5587 	const struct got_error *err = NULL;
5588 	int lineno;
5589 	char *line = NULL;
5590 	size_t linesize = 0;
5591 	ssize_t linelen;
5592 
5593 	if (!view->searching) {
5594 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5595 		return NULL;
5596 	}
5597 
5598 	if (s->matched_line) {
5599 		if (view->searching == TOG_SEARCH_FORWARD)
5600 			lineno = s->matched_line + 1;
5601 		else
5602 			lineno = s->matched_line - 1;
5603 	} else
5604 		lineno = s->first_displayed_line - 1 + s->selected_line;
5605 
5606 	while (1) {
5607 		off_t offset;
5608 
5609 		if (lineno <= 0 || lineno > s->blame.nlines) {
5610 			if (s->matched_line == 0) {
5611 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5612 				break;
5613 			}
5614 
5615 			if (view->searching == TOG_SEARCH_FORWARD)
5616 				lineno = 1;
5617 			else
5618 				lineno = s->blame.nlines;
5619 		}
5620 
5621 		offset = s->blame.line_offsets[lineno - 1];
5622 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5623 			free(line);
5624 			return got_error_from_errno("fseeko");
5625 		}
5626 		linelen = getline(&line, &linesize, s->blame.f);
5627 		if (linelen != -1) {
5628 			char *exstr;
5629 			err = expand_tab(&exstr, line);
5630 			if (err)
5631 				break;
5632 			if (match_line(exstr, &view->regex, 1,
5633 			    &view->regmatch)) {
5634 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5635 				s->matched_line = lineno;
5636 				free(exstr);
5637 				break;
5638 			}
5639 			free(exstr);
5640 		}
5641 		if (view->searching == TOG_SEARCH_FORWARD)
5642 			lineno++;
5643 		else
5644 			lineno--;
5645 	}
5646 	free(line);
5647 
5648 	if (s->matched_line) {
5649 		s->first_displayed_line = s->matched_line;
5650 		s->selected_line = 1;
5651 	}
5652 
5653 	return err;
5654 }
5655 
5656 static const struct got_error *
5657 show_blame_view(struct tog_view *view)
5658 {
5659 	const struct got_error *err = NULL;
5660 	struct tog_blame_view_state *s = &view->state.blame;
5661 	int errcode;
5662 
5663 	if (s->blame.thread == 0 && !s->blame_complete) {
5664 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5665 		    &s->blame.thread_args);
5666 		if (errcode)
5667 			return got_error_set_errno(errcode, "pthread_create");
5668 
5669 		halfdelay(1); /* fast refresh while annotating  */
5670 	}
5671 
5672 	if (s->blame_complete)
5673 		halfdelay(10); /* disable fast refresh */
5674 
5675 	err = draw_blame(view);
5676 
5677 	view_border(view);
5678 	return err;
5679 }
5680 
5681 static const struct got_error *
5682 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5683 {
5684 	const struct got_error *err = NULL, *thread_err = NULL;
5685 	struct tog_view *diff_view;
5686 	struct tog_blame_view_state *s = &view->state.blame;
5687 	int eos, nscroll, begin_y = 0, begin_x = 0;
5688 
5689 	eos = nscroll = view->nlines - 2;
5690 	if (view_is_hsplit_top(view))
5691 		--eos;  /* border */
5692 
5693 	switch (ch) {
5694 	case '0':
5695 		view->x = 0;
5696 		break;
5697 	case '$':
5698 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5699 		view->count = 0;
5700 		break;
5701 	case KEY_RIGHT:
5702 	case 'l':
5703 		if (view->x + view->ncols / 3 < view->maxx)
5704 			view->x += 2;  /* move two columns right */
5705 		else
5706 			view->count = 0;
5707 		break;
5708 	case KEY_LEFT:
5709 	case 'h':
5710 		view->x -= MIN(view->x, 2);  /* move two columns back */
5711 		if (view->x <= 0)
5712 			view->count = 0;
5713 		break;
5714 	case 'q':
5715 		s->done = 1;
5716 		break;
5717 	case 'g':
5718 	case KEY_HOME:
5719 		s->selected_line = 1;
5720 		s->first_displayed_line = 1;
5721 		view->count = 0;
5722 		break;
5723 	case 'G':
5724 	case KEY_END:
5725 		if (s->blame.nlines < eos) {
5726 			s->selected_line = s->blame.nlines;
5727 			s->first_displayed_line = 1;
5728 		} else {
5729 			s->selected_line = eos;
5730 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5731 		}
5732 		view->count = 0;
5733 		break;
5734 	case 'k':
5735 	case KEY_UP:
5736 	case CTRL('p'):
5737 		if (s->selected_line > 1)
5738 			s->selected_line--;
5739 		else if (s->selected_line == 1 &&
5740 		    s->first_displayed_line > 1)
5741 			s->first_displayed_line--;
5742 		else
5743 			view->count = 0;
5744 		break;
5745 	case CTRL('u'):
5746 	case 'u':
5747 		nscroll /= 2;
5748 		/* FALL THROUGH */
5749 	case KEY_PPAGE:
5750 	case CTRL('b'):
5751 	case 'b':
5752 		if (s->first_displayed_line == 1) {
5753 			if (view->count > 1)
5754 				nscroll += nscroll;
5755 			s->selected_line = MAX(1, s->selected_line - nscroll);
5756 			view->count = 0;
5757 			break;
5758 		}
5759 		if (s->first_displayed_line > nscroll)
5760 			s->first_displayed_line -= nscroll;
5761 		else
5762 			s->first_displayed_line = 1;
5763 		break;
5764 	case 'j':
5765 	case KEY_DOWN:
5766 	case CTRL('n'):
5767 		if (s->selected_line < eos && s->first_displayed_line +
5768 		    s->selected_line <= s->blame.nlines)
5769 			s->selected_line++;
5770 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5771 			s->first_displayed_line++;
5772 		else
5773 			view->count = 0;
5774 		break;
5775 	case 'c':
5776 	case 'p': {
5777 		struct got_object_id *id = NULL;
5778 
5779 		view->count = 0;
5780 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5781 		    s->first_displayed_line, s->selected_line);
5782 		if (id == NULL)
5783 			break;
5784 		if (ch == 'p') {
5785 			struct got_commit_object *commit, *pcommit;
5786 			struct got_object_qid *pid;
5787 			struct got_object_id *blob_id = NULL;
5788 			int obj_type;
5789 			err = got_object_open_as_commit(&commit,
5790 			    s->repo, id);
5791 			if (err)
5792 				break;
5793 			pid = STAILQ_FIRST(
5794 			    got_object_commit_get_parent_ids(commit));
5795 			if (pid == NULL) {
5796 				got_object_commit_close(commit);
5797 				break;
5798 			}
5799 			/* Check if path history ends here. */
5800 			err = got_object_open_as_commit(&pcommit,
5801 			    s->repo, &pid->id);
5802 			if (err)
5803 				break;
5804 			err = got_object_id_by_path(&blob_id, s->repo,
5805 			    pcommit, s->path);
5806 			got_object_commit_close(pcommit);
5807 			if (err) {
5808 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5809 					err = NULL;
5810 				got_object_commit_close(commit);
5811 				break;
5812 			}
5813 			err = got_object_get_type(&obj_type, s->repo,
5814 			    blob_id);
5815 			free(blob_id);
5816 			/* Can't blame non-blob type objects. */
5817 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5818 				got_object_commit_close(commit);
5819 				break;
5820 			}
5821 			err = got_object_qid_alloc(&s->blamed_commit,
5822 			    &pid->id);
5823 			got_object_commit_close(commit);
5824 		} else {
5825 			if (got_object_id_cmp(id,
5826 			    &s->blamed_commit->id) == 0)
5827 				break;
5828 			err = got_object_qid_alloc(&s->blamed_commit,
5829 			    id);
5830 		}
5831 		if (err)
5832 			break;
5833 		s->done = 1;
5834 		thread_err = stop_blame(&s->blame);
5835 		s->done = 0;
5836 		if (thread_err)
5837 			break;
5838 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5839 		    s->blamed_commit, entry);
5840 		err = run_blame(view);
5841 		if (err)
5842 			break;
5843 		break;
5844 	}
5845 	case 'C': {
5846 		struct got_object_qid *first;
5847 
5848 		view->count = 0;
5849 		first = STAILQ_FIRST(&s->blamed_commits);
5850 		if (!got_object_id_cmp(&first->id, s->commit_id))
5851 			break;
5852 		s->done = 1;
5853 		thread_err = stop_blame(&s->blame);
5854 		s->done = 0;
5855 		if (thread_err)
5856 			break;
5857 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5858 		got_object_qid_free(s->blamed_commit);
5859 		s->blamed_commit =
5860 		    STAILQ_FIRST(&s->blamed_commits);
5861 		err = run_blame(view);
5862 		if (err)
5863 			break;
5864 		break;
5865 	}
5866 	case KEY_ENTER:
5867 	case '\r': {
5868 		struct got_object_id *id = NULL;
5869 		struct got_object_qid *pid;
5870 		struct got_commit_object *commit = NULL;
5871 
5872 		view->count = 0;
5873 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5874 		    s->first_displayed_line, s->selected_line);
5875 		if (id == NULL)
5876 			break;
5877 		err = got_object_open_as_commit(&commit, s->repo, id);
5878 		if (err)
5879 			break;
5880 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5881 		if (*new_view) {
5882 			/* traversed from diff view, release diff resources  */
5883 			err = close_diff_view(*new_view);
5884 			if (err)
5885 				break;
5886 			diff_view = *new_view;
5887 		} else {
5888 			if (view_is_parent_view(view))
5889 				view_get_split(view, &begin_y, &begin_x);
5890 
5891 			diff_view = view_open(0, 0, begin_y, begin_x,
5892 			    TOG_VIEW_DIFF);
5893 			if (diff_view == NULL) {
5894 				got_object_commit_close(commit);
5895 				err = got_error_from_errno("view_open");
5896 				break;
5897 			}
5898 		}
5899 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5900 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
5901 		got_object_commit_close(commit);
5902 		if (err) {
5903 			view_close(diff_view);
5904 			break;
5905 		}
5906 		s->last_diffed_line = s->first_displayed_line - 1 +
5907 		    s->selected_line;
5908 		if (*new_view)
5909 			break;	/* still open from active diff view */
5910 		if (view_is_parent_view(view) &&
5911 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5912 			err = view_init_hsplit(view, begin_y);
5913 			if (err)
5914 				break;
5915 		}
5916 
5917 		view->focussed = 0;
5918 		diff_view->focussed = 1;
5919 		diff_view->mode = view->mode;
5920 		diff_view->nlines = view->lines - begin_y;
5921 		if (view_is_parent_view(view)) {
5922 			view_transfer_size(diff_view, view);
5923 			err = view_close_child(view);
5924 			if (err)
5925 				break;
5926 			err = view_set_child(view, diff_view);
5927 			if (err)
5928 				break;
5929 			view->focus_child = 1;
5930 		} else
5931 			*new_view = diff_view;
5932 		if (err)
5933 			break;
5934 		break;
5935 	}
5936 	case CTRL('d'):
5937 	case 'd':
5938 		nscroll /= 2;
5939 		/* FALL THROUGH */
5940 	case KEY_NPAGE:
5941 	case CTRL('f'):
5942 	case 'f':
5943 	case ' ':
5944 		if (s->last_displayed_line >= s->blame.nlines &&
5945 		    s->selected_line >= MIN(s->blame.nlines,
5946 		    view->nlines - 2)) {
5947 			view->count = 0;
5948 			break;
5949 		}
5950 		if (s->last_displayed_line >= s->blame.nlines &&
5951 		    s->selected_line < view->nlines - 2) {
5952 			s->selected_line +=
5953 			    MIN(nscroll, s->last_displayed_line -
5954 			    s->first_displayed_line - s->selected_line + 1);
5955 		}
5956 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5957 			s->first_displayed_line += nscroll;
5958 		else
5959 			s->first_displayed_line =
5960 			    s->blame.nlines - (view->nlines - 3);
5961 		break;
5962 	case KEY_RESIZE:
5963 		if (s->selected_line > view->nlines - 2) {
5964 			s->selected_line = MIN(s->blame.nlines,
5965 			    view->nlines - 2);
5966 		}
5967 		break;
5968 	default:
5969 		view->count = 0;
5970 		break;
5971 	}
5972 	return thread_err ? thread_err : err;
5973 }
5974 
5975 static const struct got_error *
5976 reset_blame_view(struct tog_view *view)
5977 {
5978 	const struct got_error *err;
5979 	struct tog_blame_view_state *s = &view->state.blame;
5980 
5981 	view->count = 0;
5982 	s->done = 1;
5983 	err = stop_blame(&s->blame);
5984 	s->done = 0;
5985 	if (err)
5986 		return err;
5987 	return run_blame(view);
5988 }
5989 
5990 static const struct got_error *
5991 cmd_blame(int argc, char *argv[])
5992 {
5993 	const struct got_error *error;
5994 	struct got_repository *repo = NULL;
5995 	struct got_worktree *worktree = NULL;
5996 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
5997 	char *link_target = NULL;
5998 	struct got_object_id *commit_id = NULL;
5999 	struct got_commit_object *commit = NULL;
6000 	char *commit_id_str = NULL;
6001 	int ch;
6002 	struct tog_view *view;
6003 	int *pack_fds = NULL;
6004 
6005 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6006 		switch (ch) {
6007 		case 'c':
6008 			commit_id_str = optarg;
6009 			break;
6010 		case 'r':
6011 			repo_path = realpath(optarg, NULL);
6012 			if (repo_path == NULL)
6013 				return got_error_from_errno2("realpath",
6014 				    optarg);
6015 			break;
6016 		default:
6017 			usage_blame();
6018 			/* NOTREACHED */
6019 		}
6020 	}
6021 
6022 	argc -= optind;
6023 	argv += optind;
6024 
6025 	if (argc != 1)
6026 		usage_blame();
6027 
6028 	error = got_repo_pack_fds_open(&pack_fds);
6029 	if (error != NULL)
6030 		goto done;
6031 
6032 	if (repo_path == NULL) {
6033 		cwd = getcwd(NULL, 0);
6034 		if (cwd == NULL)
6035 			return got_error_from_errno("getcwd");
6036 		error = got_worktree_open(&worktree, cwd);
6037 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6038 			goto done;
6039 		if (worktree)
6040 			repo_path =
6041 			    strdup(got_worktree_get_repo_path(worktree));
6042 		else
6043 			repo_path = strdup(cwd);
6044 		if (repo_path == NULL) {
6045 			error = got_error_from_errno("strdup");
6046 			goto done;
6047 		}
6048 	}
6049 
6050 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6051 	if (error != NULL)
6052 		goto done;
6053 
6054 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6055 	    worktree);
6056 	if (error)
6057 		goto done;
6058 
6059 	init_curses();
6060 
6061 	error = apply_unveil(got_repo_get_path(repo), NULL);
6062 	if (error)
6063 		goto done;
6064 
6065 	error = tog_load_refs(repo, 0);
6066 	if (error)
6067 		goto done;
6068 
6069 	if (commit_id_str == NULL) {
6070 		struct got_reference *head_ref;
6071 		error = got_ref_open(&head_ref, repo, worktree ?
6072 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6073 		if (error != NULL)
6074 			goto done;
6075 		error = got_ref_resolve(&commit_id, repo, head_ref);
6076 		got_ref_close(head_ref);
6077 	} else {
6078 		error = got_repo_match_object_id(&commit_id, NULL,
6079 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6080 	}
6081 	if (error != NULL)
6082 		goto done;
6083 
6084 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6085 	if (view == NULL) {
6086 		error = got_error_from_errno("view_open");
6087 		goto done;
6088 	}
6089 
6090 	error = got_object_open_as_commit(&commit, repo, commit_id);
6091 	if (error)
6092 		goto done;
6093 
6094 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6095 	    commit, repo);
6096 	if (error)
6097 		goto done;
6098 
6099 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6100 	    commit_id, repo);
6101 	if (error)
6102 		goto done;
6103 	if (worktree) {
6104 		/* Release work tree lock. */
6105 		got_worktree_close(worktree);
6106 		worktree = NULL;
6107 	}
6108 	error = view_loop(view);
6109 done:
6110 	free(repo_path);
6111 	free(in_repo_path);
6112 	free(link_target);
6113 	free(cwd);
6114 	free(commit_id);
6115 	if (commit)
6116 		got_object_commit_close(commit);
6117 	if (worktree)
6118 		got_worktree_close(worktree);
6119 	if (repo) {
6120 		const struct got_error *close_err = got_repo_close(repo);
6121 		if (error == NULL)
6122 			error = close_err;
6123 	}
6124 	if (pack_fds) {
6125 		const struct got_error *pack_err =
6126 		    got_repo_pack_fds_close(pack_fds);
6127 		if (error == NULL)
6128 			error = pack_err;
6129 	}
6130 	tog_free_refs();
6131 	return error;
6132 }
6133 
6134 static const struct got_error *
6135 draw_tree_entries(struct tog_view *view, const char *parent_path)
6136 {
6137 	struct tog_tree_view_state *s = &view->state.tree;
6138 	const struct got_error *err = NULL;
6139 	struct got_tree_entry *te;
6140 	wchar_t *wline;
6141 	struct tog_color *tc;
6142 	int width, n, i, nentries;
6143 	int limit = view->nlines;
6144 
6145 	s->ndisplayed = 0;
6146 	if (view_is_hsplit_top(view))
6147 		--limit;  /* border */
6148 
6149 	werase(view->window);
6150 
6151 	if (limit == 0)
6152 		return NULL;
6153 
6154 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6155 	    0, 0);
6156 	if (err)
6157 		return err;
6158 	if (view_needs_focus_indication(view))
6159 		wstandout(view->window);
6160 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
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 (view_needs_focus_indication(view))
6169 		wstandend(view->window);
6170 	free(wline);
6171 	wline = NULL;
6172 	if (width < view->ncols - 1)
6173 		waddch(view->window, '\n');
6174 	if (--limit <= 0)
6175 		return NULL;
6176 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6177 	    0, 0);
6178 	if (err)
6179 		return err;
6180 	waddwstr(view->window, wline);
6181 	free(wline);
6182 	wline = NULL;
6183 	if (width < view->ncols - 1)
6184 		waddch(view->window, '\n');
6185 	if (--limit <= 0)
6186 		return NULL;
6187 	waddch(view->window, '\n');
6188 	if (--limit <= 0)
6189 		return NULL;
6190 
6191 	if (s->first_displayed_entry == NULL) {
6192 		te = got_object_tree_get_first_entry(s->tree);
6193 		if (s->selected == 0) {
6194 			if (view->focussed)
6195 				wstandout(view->window);
6196 			s->selected_entry = NULL;
6197 		}
6198 		waddstr(view->window, "  ..\n");	/* parent directory */
6199 		if (s->selected == 0 && view->focussed)
6200 			wstandend(view->window);
6201 		s->ndisplayed++;
6202 		if (--limit <= 0)
6203 			return NULL;
6204 		n = 1;
6205 	} else {
6206 		n = 0;
6207 		te = s->first_displayed_entry;
6208 	}
6209 
6210 	nentries = got_object_tree_get_nentries(s->tree);
6211 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6212 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6213 		const char *modestr = "";
6214 		mode_t mode;
6215 
6216 		te = got_object_tree_get_entry(s->tree, i);
6217 		mode = got_tree_entry_get_mode(te);
6218 
6219 		if (s->show_ids) {
6220 			err = got_object_id_str(&id_str,
6221 			    got_tree_entry_get_id(te));
6222 			if (err)
6223 				return got_error_from_errno(
6224 				    "got_object_id_str");
6225 		}
6226 		if (got_object_tree_entry_is_submodule(te))
6227 			modestr = "$";
6228 		else if (S_ISLNK(mode)) {
6229 			int i;
6230 
6231 			err = got_tree_entry_get_symlink_target(&link_target,
6232 			    te, s->repo);
6233 			if (err) {
6234 				free(id_str);
6235 				return err;
6236 			}
6237 			for (i = 0; i < strlen(link_target); i++) {
6238 				if (!isprint((unsigned char)link_target[i]))
6239 					link_target[i] = '?';
6240 			}
6241 			modestr = "@";
6242 		}
6243 		else if (S_ISDIR(mode))
6244 			modestr = "/";
6245 		else if (mode & S_IXUSR)
6246 			modestr = "*";
6247 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6248 		    got_tree_entry_get_name(te), modestr,
6249 		    link_target ? " -> ": "",
6250 		    link_target ? link_target : "") == -1) {
6251 			free(id_str);
6252 			free(link_target);
6253 			return got_error_from_errno("asprintf");
6254 		}
6255 		free(id_str);
6256 		free(link_target);
6257 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6258 		    0, 0);
6259 		if (err) {
6260 			free(line);
6261 			break;
6262 		}
6263 		if (n == s->selected) {
6264 			if (view->focussed)
6265 				wstandout(view->window);
6266 			s->selected_entry = te;
6267 		}
6268 		tc = match_color(&s->colors, line);
6269 		if (tc)
6270 			wattr_on(view->window,
6271 			    COLOR_PAIR(tc->colorpair), NULL);
6272 		waddwstr(view->window, wline);
6273 		if (tc)
6274 			wattr_off(view->window,
6275 			    COLOR_PAIR(tc->colorpair), NULL);
6276 		if (width < view->ncols - 1)
6277 			waddch(view->window, '\n');
6278 		if (n == s->selected && view->focussed)
6279 			wstandend(view->window);
6280 		free(line);
6281 		free(wline);
6282 		wline = NULL;
6283 		n++;
6284 		s->ndisplayed++;
6285 		s->last_displayed_entry = te;
6286 		if (--limit <= 0)
6287 			break;
6288 	}
6289 
6290 	return err;
6291 }
6292 
6293 static void
6294 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6295 {
6296 	struct got_tree_entry *te;
6297 	int isroot = s->tree == s->root;
6298 	int i = 0;
6299 
6300 	if (s->first_displayed_entry == NULL)
6301 		return;
6302 
6303 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6304 	while (i++ < maxscroll) {
6305 		if (te == NULL) {
6306 			if (!isroot)
6307 				s->first_displayed_entry = NULL;
6308 			break;
6309 		}
6310 		s->first_displayed_entry = te;
6311 		te = got_tree_entry_get_prev(s->tree, te);
6312 	}
6313 }
6314 
6315 static const struct got_error *
6316 tree_scroll_down(struct tog_view *view, int maxscroll)
6317 {
6318 	struct tog_tree_view_state *s = &view->state.tree;
6319 	struct got_tree_entry *next, *last;
6320 	int n = 0;
6321 
6322 	if (s->first_displayed_entry)
6323 		next = got_tree_entry_get_next(s->tree,
6324 		    s->first_displayed_entry);
6325 	else
6326 		next = got_object_tree_get_first_entry(s->tree);
6327 
6328 	last = s->last_displayed_entry;
6329 	while (next && n++ < maxscroll) {
6330 		if (last)
6331 			last = got_tree_entry_get_next(s->tree, last);
6332 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6333 			s->first_displayed_entry = next;
6334 			next = got_tree_entry_get_next(s->tree, next);
6335 		}
6336 	}
6337 
6338 	return NULL;
6339 }
6340 
6341 static const struct got_error *
6342 tree_entry_path(char **path, struct tog_parent_trees *parents,
6343     struct got_tree_entry *te)
6344 {
6345 	const struct got_error *err = NULL;
6346 	struct tog_parent_tree *pt;
6347 	size_t len = 2; /* for leading slash and NUL */
6348 
6349 	TAILQ_FOREACH(pt, parents, entry)
6350 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6351 		    + 1 /* slash */;
6352 	if (te)
6353 		len += strlen(got_tree_entry_get_name(te));
6354 
6355 	*path = calloc(1, len);
6356 	if (path == NULL)
6357 		return got_error_from_errno("calloc");
6358 
6359 	(*path)[0] = '/';
6360 	pt = TAILQ_LAST(parents, tog_parent_trees);
6361 	while (pt) {
6362 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6363 		if (strlcat(*path, name, len) >= len) {
6364 			err = got_error(GOT_ERR_NO_SPACE);
6365 			goto done;
6366 		}
6367 		if (strlcat(*path, "/", len) >= len) {
6368 			err = got_error(GOT_ERR_NO_SPACE);
6369 			goto done;
6370 		}
6371 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6372 	}
6373 	if (te) {
6374 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6375 			err = got_error(GOT_ERR_NO_SPACE);
6376 			goto done;
6377 		}
6378 	}
6379 done:
6380 	if (err) {
6381 		free(*path);
6382 		*path = NULL;
6383 	}
6384 	return err;
6385 }
6386 
6387 static const struct got_error *
6388 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6389     struct got_tree_entry *te, struct tog_parent_trees *parents,
6390     struct got_object_id *commit_id, struct got_repository *repo)
6391 {
6392 	const struct got_error *err = NULL;
6393 	char *path;
6394 	struct tog_view *blame_view;
6395 
6396 	*new_view = NULL;
6397 
6398 	err = tree_entry_path(&path, parents, te);
6399 	if (err)
6400 		return err;
6401 
6402 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6403 	if (blame_view == NULL) {
6404 		err = got_error_from_errno("view_open");
6405 		goto done;
6406 	}
6407 
6408 	err = open_blame_view(blame_view, path, commit_id, repo);
6409 	if (err) {
6410 		if (err->code == GOT_ERR_CANCELLED)
6411 			err = NULL;
6412 		view_close(blame_view);
6413 	} else
6414 		*new_view = blame_view;
6415 done:
6416 	free(path);
6417 	return err;
6418 }
6419 
6420 static const struct got_error *
6421 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6422     struct tog_tree_view_state *s)
6423 {
6424 	struct tog_view *log_view;
6425 	const struct got_error *err = NULL;
6426 	char *path;
6427 
6428 	*new_view = NULL;
6429 
6430 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6431 	if (log_view == NULL)
6432 		return got_error_from_errno("view_open");
6433 
6434 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6435 	if (err)
6436 		return err;
6437 
6438 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6439 	    path, 0);
6440 	if (err)
6441 		view_close(log_view);
6442 	else
6443 		*new_view = log_view;
6444 	free(path);
6445 	return err;
6446 }
6447 
6448 static const struct got_error *
6449 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6450     const char *head_ref_name, struct got_repository *repo)
6451 {
6452 	const struct got_error *err = NULL;
6453 	char *commit_id_str = NULL;
6454 	struct tog_tree_view_state *s = &view->state.tree;
6455 	struct got_commit_object *commit = NULL;
6456 
6457 	TAILQ_INIT(&s->parents);
6458 	STAILQ_INIT(&s->colors);
6459 
6460 	s->commit_id = got_object_id_dup(commit_id);
6461 	if (s->commit_id == NULL)
6462 		return got_error_from_errno("got_object_id_dup");
6463 
6464 	err = got_object_open_as_commit(&commit, repo, commit_id);
6465 	if (err)
6466 		goto done;
6467 
6468 	/*
6469 	 * The root is opened here and will be closed when the view is closed.
6470 	 * Any visited subtrees and their path-wise parents are opened and
6471 	 * closed on demand.
6472 	 */
6473 	err = got_object_open_as_tree(&s->root, repo,
6474 	    got_object_commit_get_tree_id(commit));
6475 	if (err)
6476 		goto done;
6477 	s->tree = s->root;
6478 
6479 	err = got_object_id_str(&commit_id_str, commit_id);
6480 	if (err != NULL)
6481 		goto done;
6482 
6483 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6484 		err = got_error_from_errno("asprintf");
6485 		goto done;
6486 	}
6487 
6488 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6489 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6490 	if (head_ref_name) {
6491 		s->head_ref_name = strdup(head_ref_name);
6492 		if (s->head_ref_name == NULL) {
6493 			err = got_error_from_errno("strdup");
6494 			goto done;
6495 		}
6496 	}
6497 	s->repo = repo;
6498 
6499 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6500 		err = add_color(&s->colors, "\\$$",
6501 		    TOG_COLOR_TREE_SUBMODULE,
6502 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6503 		if (err)
6504 			goto done;
6505 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6506 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6507 		if (err)
6508 			goto done;
6509 		err = add_color(&s->colors, "/$",
6510 		    TOG_COLOR_TREE_DIRECTORY,
6511 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6512 		if (err)
6513 			goto done;
6514 
6515 		err = add_color(&s->colors, "\\*$",
6516 		    TOG_COLOR_TREE_EXECUTABLE,
6517 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6518 		if (err)
6519 			goto done;
6520 
6521 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6522 		    get_color_value("TOG_COLOR_COMMIT"));
6523 		if (err)
6524 			goto done;
6525 	}
6526 
6527 	view->show = show_tree_view;
6528 	view->input = input_tree_view;
6529 	view->close = close_tree_view;
6530 	view->search_start = search_start_tree_view;
6531 	view->search_next = search_next_tree_view;
6532 done:
6533 	free(commit_id_str);
6534 	if (commit)
6535 		got_object_commit_close(commit);
6536 	if (err)
6537 		close_tree_view(view);
6538 	return err;
6539 }
6540 
6541 static const struct got_error *
6542 close_tree_view(struct tog_view *view)
6543 {
6544 	struct tog_tree_view_state *s = &view->state.tree;
6545 
6546 	free_colors(&s->colors);
6547 	free(s->tree_label);
6548 	s->tree_label = NULL;
6549 	free(s->commit_id);
6550 	s->commit_id = NULL;
6551 	free(s->head_ref_name);
6552 	s->head_ref_name = NULL;
6553 	while (!TAILQ_EMPTY(&s->parents)) {
6554 		struct tog_parent_tree *parent;
6555 		parent = TAILQ_FIRST(&s->parents);
6556 		TAILQ_REMOVE(&s->parents, parent, entry);
6557 		if (parent->tree != s->root)
6558 			got_object_tree_close(parent->tree);
6559 		free(parent);
6560 
6561 	}
6562 	if (s->tree != NULL && s->tree != s->root)
6563 		got_object_tree_close(s->tree);
6564 	if (s->root)
6565 		got_object_tree_close(s->root);
6566 	return NULL;
6567 }
6568 
6569 static const struct got_error *
6570 search_start_tree_view(struct tog_view *view)
6571 {
6572 	struct tog_tree_view_state *s = &view->state.tree;
6573 
6574 	s->matched_entry = NULL;
6575 	return NULL;
6576 }
6577 
6578 static int
6579 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6580 {
6581 	regmatch_t regmatch;
6582 
6583 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6584 	    0) == 0;
6585 }
6586 
6587 static const struct got_error *
6588 search_next_tree_view(struct tog_view *view)
6589 {
6590 	struct tog_tree_view_state *s = &view->state.tree;
6591 	struct got_tree_entry *te = NULL;
6592 
6593 	if (!view->searching) {
6594 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6595 		return NULL;
6596 	}
6597 
6598 	if (s->matched_entry) {
6599 		if (view->searching == TOG_SEARCH_FORWARD) {
6600 			if (s->selected_entry)
6601 				te = got_tree_entry_get_next(s->tree,
6602 				    s->selected_entry);
6603 			else
6604 				te = got_object_tree_get_first_entry(s->tree);
6605 		} else {
6606 			if (s->selected_entry == NULL)
6607 				te = got_object_tree_get_last_entry(s->tree);
6608 			else
6609 				te = got_tree_entry_get_prev(s->tree,
6610 				    s->selected_entry);
6611 		}
6612 	} else {
6613 		if (s->selected_entry)
6614 			te = s->selected_entry;
6615 		else if (view->searching == TOG_SEARCH_FORWARD)
6616 			te = got_object_tree_get_first_entry(s->tree);
6617 		else
6618 			te = got_object_tree_get_last_entry(s->tree);
6619 	}
6620 
6621 	while (1) {
6622 		if (te == NULL) {
6623 			if (s->matched_entry == NULL) {
6624 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6625 				return NULL;
6626 			}
6627 			if (view->searching == TOG_SEARCH_FORWARD)
6628 				te = got_object_tree_get_first_entry(s->tree);
6629 			else
6630 				te = got_object_tree_get_last_entry(s->tree);
6631 		}
6632 
6633 		if (match_tree_entry(te, &view->regex)) {
6634 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6635 			s->matched_entry = te;
6636 			break;
6637 		}
6638 
6639 		if (view->searching == TOG_SEARCH_FORWARD)
6640 			te = got_tree_entry_get_next(s->tree, te);
6641 		else
6642 			te = got_tree_entry_get_prev(s->tree, te);
6643 	}
6644 
6645 	if (s->matched_entry) {
6646 		s->first_displayed_entry = s->matched_entry;
6647 		s->selected = 0;
6648 	}
6649 
6650 	return NULL;
6651 }
6652 
6653 static const struct got_error *
6654 show_tree_view(struct tog_view *view)
6655 {
6656 	const struct got_error *err = NULL;
6657 	struct tog_tree_view_state *s = &view->state.tree;
6658 	char *parent_path;
6659 
6660 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6661 	if (err)
6662 		return err;
6663 
6664 	err = draw_tree_entries(view, parent_path);
6665 	free(parent_path);
6666 
6667 	view_border(view);
6668 	return err;
6669 }
6670 
6671 static const struct got_error *
6672 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6673 {
6674 	const struct got_error *err = NULL;
6675 	struct tog_tree_view_state *s = &view->state.tree;
6676 	struct tog_view *log_view, *ref_view;
6677 	struct got_tree_entry *te;
6678 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6679 
6680 	switch (ch) {
6681 	case 'i':
6682 		s->show_ids = !s->show_ids;
6683 		view->count = 0;
6684 		break;
6685 	case 'l':
6686 		view->count = 0;
6687 		if (!s->selected_entry)
6688 			break;
6689 		if (view_is_parent_view(view))
6690 			view_get_split(view, &begin_y, &begin_x);
6691 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6692 		if (view_is_parent_view(view) &&
6693 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6694 			err = view_init_hsplit(view, begin_y);
6695 			if (err)
6696 				break;
6697 		}
6698 		view->focussed = 0;
6699 		log_view->focussed = 1;
6700 		log_view->mode = view->mode;
6701 		log_view->nlines = view->lines - begin_y;
6702 		if (view_is_parent_view(view)) {
6703 			view_transfer_size(log_view, view);
6704 			err = view_close_child(view);
6705 			if (err)
6706 				return err;
6707 			err = view_set_child(view, log_view);
6708 			if (err)
6709 				return err;
6710 			view->focus_child = 1;
6711 		} else
6712 			*new_view = log_view;
6713 		break;
6714 	case 'r':
6715 		view->count = 0;
6716 		if (view_is_parent_view(view))
6717 			view_get_split(view, &begin_y, &begin_x);
6718 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6719 		if (ref_view == NULL)
6720 			return got_error_from_errno("view_open");
6721 		err = open_ref_view(ref_view, s->repo);
6722 		if (err) {
6723 			view_close(ref_view);
6724 			return err;
6725 		}
6726 		if (view_is_parent_view(view) &&
6727 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6728 			err = view_init_hsplit(view, begin_y);
6729 			if (err)
6730 				break;
6731 		}
6732 		view->focussed = 0;
6733 		ref_view->focussed = 1;
6734 		ref_view->mode = view->mode;
6735 		ref_view->nlines = view->lines - begin_y;
6736 		if (view_is_parent_view(view)) {
6737 			view_transfer_size(ref_view, view);
6738 			err = view_close_child(view);
6739 			if (err)
6740 				return err;
6741 			err = view_set_child(view, ref_view);
6742 			if (err)
6743 				return err;
6744 			view->focus_child = 1;
6745 		} else
6746 			*new_view = ref_view;
6747 		break;
6748 	case 'g':
6749 	case KEY_HOME:
6750 		s->selected = 0;
6751 		view->count = 0;
6752 		if (s->tree == s->root)
6753 			s->first_displayed_entry =
6754 			    got_object_tree_get_first_entry(s->tree);
6755 		else
6756 			s->first_displayed_entry = NULL;
6757 		break;
6758 	case 'G':
6759 	case KEY_END: {
6760 		int eos = view->nlines - 3;
6761 
6762 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6763 			--eos;  /* border */
6764 		s->selected = 0;
6765 		view->count = 0;
6766 		te = got_object_tree_get_last_entry(s->tree);
6767 		for (n = 0; n < eos; n++) {
6768 			if (te == NULL) {
6769 				if(s->tree != s->root) {
6770 					s->first_displayed_entry = NULL;
6771 					n++;
6772 				}
6773 				break;
6774 			}
6775 			s->first_displayed_entry = te;
6776 			te = got_tree_entry_get_prev(s->tree, te);
6777 		}
6778 		if (n > 0)
6779 			s->selected = n - 1;
6780 		break;
6781 	}
6782 	case 'k':
6783 	case KEY_UP:
6784 	case CTRL('p'):
6785 		if (s->selected > 0) {
6786 			s->selected--;
6787 			break;
6788 		}
6789 		tree_scroll_up(s, 1);
6790 		if (s->selected_entry == NULL ||
6791 		    (s->tree == s->root && s->selected_entry ==
6792 		     got_object_tree_get_first_entry(s->tree)))
6793 			view->count = 0;
6794 		break;
6795 	case CTRL('u'):
6796 	case 'u':
6797 		nscroll /= 2;
6798 		/* FALL THROUGH */
6799 	case KEY_PPAGE:
6800 	case CTRL('b'):
6801 	case 'b':
6802 		if (s->tree == s->root) {
6803 			if (got_object_tree_get_first_entry(s->tree) ==
6804 			    s->first_displayed_entry)
6805 				s->selected -= MIN(s->selected, nscroll);
6806 		} else {
6807 			if (s->first_displayed_entry == NULL)
6808 				s->selected -= MIN(s->selected, nscroll);
6809 		}
6810 		tree_scroll_up(s, MAX(0, nscroll));
6811 		if (s->selected_entry == NULL ||
6812 		    (s->tree == s->root && s->selected_entry ==
6813 		     got_object_tree_get_first_entry(s->tree)))
6814 			view->count = 0;
6815 		break;
6816 	case 'j':
6817 	case KEY_DOWN:
6818 	case CTRL('n'):
6819 		if (s->selected < s->ndisplayed - 1) {
6820 			s->selected++;
6821 			break;
6822 		}
6823 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6824 		    == NULL) {
6825 			/* can't scroll any further */
6826 			view->count = 0;
6827 			break;
6828 		}
6829 		tree_scroll_down(view, 1);
6830 		break;
6831 	case CTRL('d'):
6832 	case 'd':
6833 		nscroll /= 2;
6834 		/* FALL THROUGH */
6835 	case KEY_NPAGE:
6836 	case CTRL('f'):
6837 	case 'f':
6838 	case ' ':
6839 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6840 		    == NULL) {
6841 			/* can't scroll any further; move cursor down */
6842 			if (s->selected < s->ndisplayed - 1)
6843 				s->selected += MIN(nscroll,
6844 				    s->ndisplayed - s->selected - 1);
6845 			else
6846 				view->count = 0;
6847 			break;
6848 		}
6849 		tree_scroll_down(view, nscroll);
6850 		break;
6851 	case KEY_ENTER:
6852 	case '\r':
6853 	case KEY_BACKSPACE:
6854 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6855 			struct tog_parent_tree *parent;
6856 			/* user selected '..' */
6857 			if (s->tree == s->root) {
6858 				view->count = 0;
6859 				break;
6860 			}
6861 			parent = TAILQ_FIRST(&s->parents);
6862 			TAILQ_REMOVE(&s->parents, parent,
6863 			    entry);
6864 			got_object_tree_close(s->tree);
6865 			s->tree = parent->tree;
6866 			s->first_displayed_entry =
6867 			    parent->first_displayed_entry;
6868 			s->selected_entry =
6869 			    parent->selected_entry;
6870 			s->selected = parent->selected;
6871 			if (s->selected > view->nlines - 3) {
6872 				err = offset_selection_down(view);
6873 				if (err)
6874 					break;
6875 			}
6876 			free(parent);
6877 		} else if (S_ISDIR(got_tree_entry_get_mode(
6878 		    s->selected_entry))) {
6879 			struct got_tree_object *subtree;
6880 			view->count = 0;
6881 			err = got_object_open_as_tree(&subtree, s->repo,
6882 			    got_tree_entry_get_id(s->selected_entry));
6883 			if (err)
6884 				break;
6885 			err = tree_view_visit_subtree(s, subtree);
6886 			if (err) {
6887 				got_object_tree_close(subtree);
6888 				break;
6889 			}
6890 		} else if (S_ISREG(got_tree_entry_get_mode(
6891 		    s->selected_entry))) {
6892 			struct tog_view *blame_view;
6893 			int begin_x = 0, begin_y = 0;
6894 
6895 			if (view_is_parent_view(view))
6896 				view_get_split(view, &begin_y, &begin_x);
6897 
6898 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6899 			    s->selected_entry, &s->parents,
6900 			    s->commit_id, s->repo);
6901 			if (err)
6902 				break;
6903 
6904 			if (view_is_parent_view(view) &&
6905 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
6906 				err = view_init_hsplit(view, begin_y);
6907 				if (err)
6908 					break;
6909 			}
6910 
6911 			view->count = 0;
6912 			view->focussed = 0;
6913 			blame_view->focussed = 1;
6914 			blame_view->mode = view->mode;
6915 			blame_view->nlines = view->lines - begin_y;
6916 			if (view_is_parent_view(view)) {
6917 				view_transfer_size(blame_view, view);
6918 				err = view_close_child(view);
6919 				if (err)
6920 					return err;
6921 				err = view_set_child(view, blame_view);
6922 				if (err)
6923 					return err;
6924 				view->focus_child = 1;
6925 			} else
6926 				*new_view = blame_view;
6927 		}
6928 		break;
6929 	case KEY_RESIZE:
6930 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6931 			s->selected = view->nlines - 4;
6932 		view->count = 0;
6933 		break;
6934 	default:
6935 		view->count = 0;
6936 		break;
6937 	}
6938 
6939 	return err;
6940 }
6941 
6942 __dead static void
6943 usage_tree(void)
6944 {
6945 	endwin();
6946 	fprintf(stderr,
6947 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6948 	    getprogname());
6949 	exit(1);
6950 }
6951 
6952 static const struct got_error *
6953 cmd_tree(int argc, char *argv[])
6954 {
6955 	const struct got_error *error;
6956 	struct got_repository *repo = NULL;
6957 	struct got_worktree *worktree = NULL;
6958 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6959 	struct got_object_id *commit_id = NULL;
6960 	struct got_commit_object *commit = NULL;
6961 	const char *commit_id_arg = NULL;
6962 	char *label = NULL;
6963 	struct got_reference *ref = NULL;
6964 	const char *head_ref_name = NULL;
6965 	int ch;
6966 	struct tog_view *view;
6967 	int *pack_fds = NULL;
6968 
6969 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6970 		switch (ch) {
6971 		case 'c':
6972 			commit_id_arg = optarg;
6973 			break;
6974 		case 'r':
6975 			repo_path = realpath(optarg, NULL);
6976 			if (repo_path == NULL)
6977 				return got_error_from_errno2("realpath",
6978 				    optarg);
6979 			break;
6980 		default:
6981 			usage_tree();
6982 			/* NOTREACHED */
6983 		}
6984 	}
6985 
6986 	argc -= optind;
6987 	argv += optind;
6988 
6989 	if (argc > 1)
6990 		usage_tree();
6991 
6992 	error = got_repo_pack_fds_open(&pack_fds);
6993 	if (error != NULL)
6994 		goto done;
6995 
6996 	if (repo_path == NULL) {
6997 		cwd = getcwd(NULL, 0);
6998 		if (cwd == NULL)
6999 			return got_error_from_errno("getcwd");
7000 		error = got_worktree_open(&worktree, cwd);
7001 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7002 			goto done;
7003 		if (worktree)
7004 			repo_path =
7005 			    strdup(got_worktree_get_repo_path(worktree));
7006 		else
7007 			repo_path = strdup(cwd);
7008 		if (repo_path == NULL) {
7009 			error = got_error_from_errno("strdup");
7010 			goto done;
7011 		}
7012 	}
7013 
7014 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7015 	if (error != NULL)
7016 		goto done;
7017 
7018 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7019 	    repo, worktree);
7020 	if (error)
7021 		goto done;
7022 
7023 	init_curses();
7024 
7025 	error = apply_unveil(got_repo_get_path(repo), NULL);
7026 	if (error)
7027 		goto done;
7028 
7029 	error = tog_load_refs(repo, 0);
7030 	if (error)
7031 		goto done;
7032 
7033 	if (commit_id_arg == NULL) {
7034 		error = got_repo_match_object_id(&commit_id, &label,
7035 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7036 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7037 		if (error)
7038 			goto done;
7039 		head_ref_name = label;
7040 	} else {
7041 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7042 		if (error == NULL)
7043 			head_ref_name = got_ref_get_name(ref);
7044 		else if (error->code != GOT_ERR_NOT_REF)
7045 			goto done;
7046 		error = got_repo_match_object_id(&commit_id, NULL,
7047 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7048 		if (error)
7049 			goto done;
7050 	}
7051 
7052 	error = got_object_open_as_commit(&commit, repo, commit_id);
7053 	if (error)
7054 		goto done;
7055 
7056 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7057 	if (view == NULL) {
7058 		error = got_error_from_errno("view_open");
7059 		goto done;
7060 	}
7061 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7062 	if (error)
7063 		goto done;
7064 	if (!got_path_is_root_dir(in_repo_path)) {
7065 		error = tree_view_walk_path(&view->state.tree, commit,
7066 		    in_repo_path);
7067 		if (error)
7068 			goto done;
7069 	}
7070 
7071 	if (worktree) {
7072 		/* Release work tree lock. */
7073 		got_worktree_close(worktree);
7074 		worktree = NULL;
7075 	}
7076 	error = view_loop(view);
7077 done:
7078 	free(repo_path);
7079 	free(cwd);
7080 	free(commit_id);
7081 	free(label);
7082 	if (ref)
7083 		got_ref_close(ref);
7084 	if (repo) {
7085 		const struct got_error *close_err = got_repo_close(repo);
7086 		if (error == NULL)
7087 			error = close_err;
7088 	}
7089 	if (pack_fds) {
7090 		const struct got_error *pack_err =
7091 		    got_repo_pack_fds_close(pack_fds);
7092 		if (error == NULL)
7093 			error = pack_err;
7094 	}
7095 	tog_free_refs();
7096 	return error;
7097 }
7098 
7099 static const struct got_error *
7100 ref_view_load_refs(struct tog_ref_view_state *s)
7101 {
7102 	struct got_reflist_entry *sre;
7103 	struct tog_reflist_entry *re;
7104 
7105 	s->nrefs = 0;
7106 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7107 		if (strncmp(got_ref_get_name(sre->ref),
7108 		    "refs/got/", 9) == 0 &&
7109 		    strncmp(got_ref_get_name(sre->ref),
7110 		    "refs/got/backup/", 16) != 0)
7111 			continue;
7112 
7113 		re = malloc(sizeof(*re));
7114 		if (re == NULL)
7115 			return got_error_from_errno("malloc");
7116 
7117 		re->ref = got_ref_dup(sre->ref);
7118 		if (re->ref == NULL)
7119 			return got_error_from_errno("got_ref_dup");
7120 		re->idx = s->nrefs++;
7121 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7122 	}
7123 
7124 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7125 	return NULL;
7126 }
7127 
7128 static void
7129 ref_view_free_refs(struct tog_ref_view_state *s)
7130 {
7131 	struct tog_reflist_entry *re;
7132 
7133 	while (!TAILQ_EMPTY(&s->refs)) {
7134 		re = TAILQ_FIRST(&s->refs);
7135 		TAILQ_REMOVE(&s->refs, re, entry);
7136 		got_ref_close(re->ref);
7137 		free(re);
7138 	}
7139 }
7140 
7141 static const struct got_error *
7142 open_ref_view(struct tog_view *view, struct got_repository *repo)
7143 {
7144 	const struct got_error *err = NULL;
7145 	struct tog_ref_view_state *s = &view->state.ref;
7146 
7147 	s->selected_entry = 0;
7148 	s->repo = repo;
7149 
7150 	TAILQ_INIT(&s->refs);
7151 	STAILQ_INIT(&s->colors);
7152 
7153 	err = ref_view_load_refs(s);
7154 	if (err)
7155 		return err;
7156 
7157 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7158 		err = add_color(&s->colors, "^refs/heads/",
7159 		    TOG_COLOR_REFS_HEADS,
7160 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7161 		if (err)
7162 			goto done;
7163 
7164 		err = add_color(&s->colors, "^refs/tags/",
7165 		    TOG_COLOR_REFS_TAGS,
7166 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7167 		if (err)
7168 			goto done;
7169 
7170 		err = add_color(&s->colors, "^refs/remotes/",
7171 		    TOG_COLOR_REFS_REMOTES,
7172 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7173 		if (err)
7174 			goto done;
7175 
7176 		err = add_color(&s->colors, "^refs/got/backup/",
7177 		    TOG_COLOR_REFS_BACKUP,
7178 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7179 		if (err)
7180 			goto done;
7181 	}
7182 
7183 	view->show = show_ref_view;
7184 	view->input = input_ref_view;
7185 	view->close = close_ref_view;
7186 	view->search_start = search_start_ref_view;
7187 	view->search_next = search_next_ref_view;
7188 done:
7189 	if (err)
7190 		free_colors(&s->colors);
7191 	return err;
7192 }
7193 
7194 static const struct got_error *
7195 close_ref_view(struct tog_view *view)
7196 {
7197 	struct tog_ref_view_state *s = &view->state.ref;
7198 
7199 	ref_view_free_refs(s);
7200 	free_colors(&s->colors);
7201 
7202 	return NULL;
7203 }
7204 
7205 static const struct got_error *
7206 resolve_reflist_entry(struct got_object_id **commit_id,
7207     struct tog_reflist_entry *re, struct got_repository *repo)
7208 {
7209 	const struct got_error *err = NULL;
7210 	struct got_object_id *obj_id;
7211 	struct got_tag_object *tag = NULL;
7212 	int obj_type;
7213 
7214 	*commit_id = NULL;
7215 
7216 	err = got_ref_resolve(&obj_id, repo, re->ref);
7217 	if (err)
7218 		return err;
7219 
7220 	err = got_object_get_type(&obj_type, repo, obj_id);
7221 	if (err)
7222 		goto done;
7223 
7224 	switch (obj_type) {
7225 	case GOT_OBJ_TYPE_COMMIT:
7226 		*commit_id = obj_id;
7227 		break;
7228 	case GOT_OBJ_TYPE_TAG:
7229 		err = got_object_open_as_tag(&tag, repo, obj_id);
7230 		if (err)
7231 			goto done;
7232 		free(obj_id);
7233 		err = got_object_get_type(&obj_type, repo,
7234 		    got_object_tag_get_object_id(tag));
7235 		if (err)
7236 			goto done;
7237 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7238 			err = got_error(GOT_ERR_OBJ_TYPE);
7239 			goto done;
7240 		}
7241 		*commit_id = got_object_id_dup(
7242 		    got_object_tag_get_object_id(tag));
7243 		if (*commit_id == NULL) {
7244 			err = got_error_from_errno("got_object_id_dup");
7245 			goto done;
7246 		}
7247 		break;
7248 	default:
7249 		err = got_error(GOT_ERR_OBJ_TYPE);
7250 		break;
7251 	}
7252 
7253 done:
7254 	if (tag)
7255 		got_object_tag_close(tag);
7256 	if (err) {
7257 		free(*commit_id);
7258 		*commit_id = NULL;
7259 	}
7260 	return err;
7261 }
7262 
7263 static const struct got_error *
7264 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7265     struct tog_reflist_entry *re, struct got_repository *repo)
7266 {
7267 	struct tog_view *log_view;
7268 	const struct got_error *err = NULL;
7269 	struct got_object_id *commit_id = NULL;
7270 
7271 	*new_view = NULL;
7272 
7273 	err = resolve_reflist_entry(&commit_id, re, repo);
7274 	if (err) {
7275 		if (err->code != GOT_ERR_OBJ_TYPE)
7276 			return err;
7277 		else
7278 			return NULL;
7279 	}
7280 
7281 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7282 	if (log_view == NULL) {
7283 		err = got_error_from_errno("view_open");
7284 		goto done;
7285 	}
7286 
7287 	err = open_log_view(log_view, commit_id, repo,
7288 	    got_ref_get_name(re->ref), "", 0);
7289 done:
7290 	if (err)
7291 		view_close(log_view);
7292 	else
7293 		*new_view = log_view;
7294 	free(commit_id);
7295 	return err;
7296 }
7297 
7298 static void
7299 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7300 {
7301 	struct tog_reflist_entry *re;
7302 	int i = 0;
7303 
7304 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7305 		return;
7306 
7307 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7308 	while (i++ < maxscroll) {
7309 		if (re == NULL)
7310 			break;
7311 		s->first_displayed_entry = re;
7312 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7313 	}
7314 }
7315 
7316 static const struct got_error *
7317 ref_scroll_down(struct tog_view *view, int maxscroll)
7318 {
7319 	struct tog_ref_view_state *s = &view->state.ref;
7320 	struct tog_reflist_entry *next, *last;
7321 	int n = 0;
7322 
7323 	if (s->first_displayed_entry)
7324 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7325 	else
7326 		next = TAILQ_FIRST(&s->refs);
7327 
7328 	last = s->last_displayed_entry;
7329 	while (next && n++ < maxscroll) {
7330 		if (last)
7331 			last = TAILQ_NEXT(last, entry);
7332 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7333 			s->first_displayed_entry = next;
7334 			next = TAILQ_NEXT(next, entry);
7335 		}
7336 	}
7337 
7338 	return NULL;
7339 }
7340 
7341 static const struct got_error *
7342 search_start_ref_view(struct tog_view *view)
7343 {
7344 	struct tog_ref_view_state *s = &view->state.ref;
7345 
7346 	s->matched_entry = NULL;
7347 	return NULL;
7348 }
7349 
7350 static int
7351 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7352 {
7353 	regmatch_t regmatch;
7354 
7355 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7356 	    0) == 0;
7357 }
7358 
7359 static const struct got_error *
7360 search_next_ref_view(struct tog_view *view)
7361 {
7362 	struct tog_ref_view_state *s = &view->state.ref;
7363 	struct tog_reflist_entry *re = NULL;
7364 
7365 	if (!view->searching) {
7366 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7367 		return NULL;
7368 	}
7369 
7370 	if (s->matched_entry) {
7371 		if (view->searching == TOG_SEARCH_FORWARD) {
7372 			if (s->selected_entry)
7373 				re = TAILQ_NEXT(s->selected_entry, entry);
7374 			else
7375 				re = TAILQ_PREV(s->selected_entry,
7376 				    tog_reflist_head, entry);
7377 		} else {
7378 			if (s->selected_entry == NULL)
7379 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7380 			else
7381 				re = TAILQ_PREV(s->selected_entry,
7382 				    tog_reflist_head, entry);
7383 		}
7384 	} else {
7385 		if (s->selected_entry)
7386 			re = s->selected_entry;
7387 		else if (view->searching == TOG_SEARCH_FORWARD)
7388 			re = TAILQ_FIRST(&s->refs);
7389 		else
7390 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7391 	}
7392 
7393 	while (1) {
7394 		if (re == NULL) {
7395 			if (s->matched_entry == NULL) {
7396 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7397 				return NULL;
7398 			}
7399 			if (view->searching == TOG_SEARCH_FORWARD)
7400 				re = TAILQ_FIRST(&s->refs);
7401 			else
7402 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7403 		}
7404 
7405 		if (match_reflist_entry(re, &view->regex)) {
7406 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7407 			s->matched_entry = re;
7408 			break;
7409 		}
7410 
7411 		if (view->searching == TOG_SEARCH_FORWARD)
7412 			re = TAILQ_NEXT(re, entry);
7413 		else
7414 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7415 	}
7416 
7417 	if (s->matched_entry) {
7418 		s->first_displayed_entry = s->matched_entry;
7419 		s->selected = 0;
7420 	}
7421 
7422 	return NULL;
7423 }
7424 
7425 static const struct got_error *
7426 show_ref_view(struct tog_view *view)
7427 {
7428 	const struct got_error *err = NULL;
7429 	struct tog_ref_view_state *s = &view->state.ref;
7430 	struct tog_reflist_entry *re;
7431 	char *line = NULL;
7432 	wchar_t *wline;
7433 	struct tog_color *tc;
7434 	int width, n;
7435 	int limit = view->nlines;
7436 
7437 	werase(view->window);
7438 
7439 	s->ndisplayed = 0;
7440 	if (view_is_hsplit_top(view))
7441 		--limit;  /* border */
7442 
7443 	if (limit == 0)
7444 		return NULL;
7445 
7446 	re = s->first_displayed_entry;
7447 
7448 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7449 	    s->nrefs) == -1)
7450 		return got_error_from_errno("asprintf");
7451 
7452 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7453 	if (err) {
7454 		free(line);
7455 		return err;
7456 	}
7457 	if (view_needs_focus_indication(view))
7458 		wstandout(view->window);
7459 	waddwstr(view->window, wline);
7460 	if (view_needs_focus_indication(view))
7461 		wstandend(view->window);
7462 	free(wline);
7463 	wline = NULL;
7464 	free(line);
7465 	line = NULL;
7466 	if (width < view->ncols - 1)
7467 		waddch(view->window, '\n');
7468 	if (--limit <= 0)
7469 		return NULL;
7470 
7471 	n = 0;
7472 	while (re && limit > 0) {
7473 		char *line = NULL;
7474 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7475 
7476 		if (s->show_date) {
7477 			struct got_commit_object *ci;
7478 			struct got_tag_object *tag;
7479 			struct got_object_id *id;
7480 			struct tm tm;
7481 			time_t t;
7482 
7483 			err = got_ref_resolve(&id, s->repo, re->ref);
7484 			if (err)
7485 				return err;
7486 			err = got_object_open_as_tag(&tag, s->repo, id);
7487 			if (err) {
7488 				if (err->code != GOT_ERR_OBJ_TYPE) {
7489 					free(id);
7490 					return err;
7491 				}
7492 				err = got_object_open_as_commit(&ci, s->repo,
7493 				    id);
7494 				if (err) {
7495 					free(id);
7496 					return err;
7497 				}
7498 				t = got_object_commit_get_committer_time(ci);
7499 				got_object_commit_close(ci);
7500 			} else {
7501 				t = got_object_tag_get_tagger_time(tag);
7502 				got_object_tag_close(tag);
7503 			}
7504 			free(id);
7505 			if (gmtime_r(&t, &tm) == NULL)
7506 				return got_error_from_errno("gmtime_r");
7507 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7508 				return got_error(GOT_ERR_NO_SPACE);
7509 		}
7510 		if (got_ref_is_symbolic(re->ref)) {
7511 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7512 			    ymd : "", got_ref_get_name(re->ref),
7513 			    got_ref_get_symref_target(re->ref)) == -1)
7514 				return got_error_from_errno("asprintf");
7515 		} else if (s->show_ids) {
7516 			struct got_object_id *id;
7517 			char *id_str;
7518 			err = got_ref_resolve(&id, s->repo, re->ref);
7519 			if (err)
7520 				return err;
7521 			err = got_object_id_str(&id_str, id);
7522 			if (err) {
7523 				free(id);
7524 				return err;
7525 			}
7526 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7527 			    got_ref_get_name(re->ref), id_str) == -1) {
7528 				err = got_error_from_errno("asprintf");
7529 				free(id);
7530 				free(id_str);
7531 				return err;
7532 			}
7533 			free(id);
7534 			free(id_str);
7535 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7536 		    got_ref_get_name(re->ref)) == -1)
7537 			return got_error_from_errno("asprintf");
7538 
7539 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7540 		    0, 0);
7541 		if (err) {
7542 			free(line);
7543 			return err;
7544 		}
7545 		if (n == s->selected) {
7546 			if (view->focussed)
7547 				wstandout(view->window);
7548 			s->selected_entry = re;
7549 		}
7550 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7551 		if (tc)
7552 			wattr_on(view->window,
7553 			    COLOR_PAIR(tc->colorpair), NULL);
7554 		waddwstr(view->window, wline);
7555 		if (tc)
7556 			wattr_off(view->window,
7557 			    COLOR_PAIR(tc->colorpair), NULL);
7558 		if (width < view->ncols - 1)
7559 			waddch(view->window, '\n');
7560 		if (n == s->selected && view->focussed)
7561 			wstandend(view->window);
7562 		free(line);
7563 		free(wline);
7564 		wline = NULL;
7565 		n++;
7566 		s->ndisplayed++;
7567 		s->last_displayed_entry = re;
7568 
7569 		limit--;
7570 		re = TAILQ_NEXT(re, entry);
7571 	}
7572 
7573 	view_border(view);
7574 	return err;
7575 }
7576 
7577 static const struct got_error *
7578 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7579     struct tog_reflist_entry *re, struct got_repository *repo)
7580 {
7581 	const struct got_error *err = NULL;
7582 	struct got_object_id *commit_id = NULL;
7583 	struct tog_view *tree_view;
7584 
7585 	*new_view = NULL;
7586 
7587 	err = resolve_reflist_entry(&commit_id, re, repo);
7588 	if (err) {
7589 		if (err->code != GOT_ERR_OBJ_TYPE)
7590 			return err;
7591 		else
7592 			return NULL;
7593 	}
7594 
7595 
7596 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7597 	if (tree_view == NULL) {
7598 		err = got_error_from_errno("view_open");
7599 		goto done;
7600 	}
7601 
7602 	err = open_tree_view(tree_view, commit_id,
7603 	    got_ref_get_name(re->ref), repo);
7604 	if (err)
7605 		goto done;
7606 
7607 	*new_view = tree_view;
7608 done:
7609 	free(commit_id);
7610 	return err;
7611 }
7612 static const struct got_error *
7613 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7614 {
7615 	const struct got_error *err = NULL;
7616 	struct tog_ref_view_state *s = &view->state.ref;
7617 	struct tog_view *log_view, *tree_view;
7618 	struct tog_reflist_entry *re;
7619 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7620 
7621 	switch (ch) {
7622 	case 'i':
7623 		s->show_ids = !s->show_ids;
7624 		view->count = 0;
7625 		break;
7626 	case 'm':
7627 		s->show_date = !s->show_date;
7628 		view->count = 0;
7629 		break;
7630 	case 'o':
7631 		s->sort_by_date = !s->sort_by_date;
7632 		view->count = 0;
7633 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7634 		    got_ref_cmp_by_commit_timestamp_descending :
7635 		    tog_ref_cmp_by_name, s->repo);
7636 		if (err)
7637 			break;
7638 		got_reflist_object_id_map_free(tog_refs_idmap);
7639 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7640 		    &tog_refs, s->repo);
7641 		if (err)
7642 			break;
7643 		ref_view_free_refs(s);
7644 		err = ref_view_load_refs(s);
7645 		break;
7646 	case KEY_ENTER:
7647 	case '\r':
7648 		view->count = 0;
7649 		if (!s->selected_entry)
7650 			break;
7651 		if (view_is_parent_view(view))
7652 			view_get_split(view, &begin_y, &begin_x);
7653 
7654 		err = log_ref_entry(&log_view, begin_y, begin_x,
7655 		    s->selected_entry, s->repo);
7656 		if (err)
7657 			break;
7658 
7659 		if (view_is_parent_view(view) &&
7660 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7661 			err = view_init_hsplit(view, begin_y);
7662 			if (err)
7663 				break;
7664 		}
7665 
7666 		view->focussed = 0;
7667 		log_view->focussed = 1;
7668 		log_view->mode = view->mode;
7669 		log_view->nlines = view->lines - begin_y;
7670 		if (view_is_parent_view(view)) {
7671 			view_transfer_size(log_view, view);
7672 			err = view_close_child(view);
7673 			if (err)
7674 				return err;
7675 			err = view_set_child(view, log_view);
7676 			if (err)
7677 				return err;
7678 			view->focus_child = 1;
7679 		} else
7680 			*new_view = log_view;
7681 		break;
7682 	case 't':
7683 		view->count = 0;
7684 		if (!s->selected_entry)
7685 			break;
7686 		if (view_is_parent_view(view))
7687 			view_get_split(view, &begin_y, &begin_x);
7688 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7689 		    s->selected_entry, s->repo);
7690 		if (err || tree_view == NULL)
7691 			break;
7692 		if (view_is_parent_view(view) &&
7693 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7694 			err = view_init_hsplit(view, begin_y);
7695 			if (err)
7696 				break;
7697 		}
7698 		view->focussed = 0;
7699 		tree_view->focussed = 1;
7700 		tree_view->mode = view->mode;
7701 		tree_view->nlines = view->lines - begin_y;
7702 		if (view_is_parent_view(view)) {
7703 			view_transfer_size(tree_view, view);
7704 			err = view_close_child(view);
7705 			if (err)
7706 				return err;
7707 			err = view_set_child(view, tree_view);
7708 			if (err)
7709 				return err;
7710 			view->focus_child = 1;
7711 		} else
7712 			*new_view = tree_view;
7713 		break;
7714 	case 'g':
7715 	case KEY_HOME:
7716 		s->selected = 0;
7717 		view->count = 0;
7718 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7719 		break;
7720 	case 'G':
7721 	case KEY_END: {
7722 		int eos = view->nlines - 1;
7723 
7724 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7725 			--eos;  /* border */
7726 		s->selected = 0;
7727 		view->count = 0;
7728 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7729 		for (n = 0; n < eos; n++) {
7730 			if (re == NULL)
7731 				break;
7732 			s->first_displayed_entry = re;
7733 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7734 		}
7735 		if (n > 0)
7736 			s->selected = n - 1;
7737 		break;
7738 	}
7739 	case 'k':
7740 	case KEY_UP:
7741 	case CTRL('p'):
7742 		if (s->selected > 0) {
7743 			s->selected--;
7744 			break;
7745 		}
7746 		ref_scroll_up(s, 1);
7747 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7748 			view->count = 0;
7749 		break;
7750 	case CTRL('u'):
7751 	case 'u':
7752 		nscroll /= 2;
7753 		/* FALL THROUGH */
7754 	case KEY_PPAGE:
7755 	case CTRL('b'):
7756 	case 'b':
7757 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7758 			s->selected -= MIN(nscroll, s->selected);
7759 		ref_scroll_up(s, MAX(0, nscroll));
7760 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7761 			view->count = 0;
7762 		break;
7763 	case 'j':
7764 	case KEY_DOWN:
7765 	case CTRL('n'):
7766 		if (s->selected < s->ndisplayed - 1) {
7767 			s->selected++;
7768 			break;
7769 		}
7770 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7771 			/* can't scroll any further */
7772 			view->count = 0;
7773 			break;
7774 		}
7775 		ref_scroll_down(view, 1);
7776 		break;
7777 	case CTRL('d'):
7778 	case 'd':
7779 		nscroll /= 2;
7780 		/* FALL THROUGH */
7781 	case KEY_NPAGE:
7782 	case CTRL('f'):
7783 	case 'f':
7784 	case ' ':
7785 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7786 			/* can't scroll any further; move cursor down */
7787 			if (s->selected < s->ndisplayed - 1)
7788 				s->selected += MIN(nscroll,
7789 				    s->ndisplayed - s->selected - 1);
7790 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7791 				s->selected += s->ndisplayed - s->selected - 1;
7792 			view->count = 0;
7793 			break;
7794 		}
7795 		ref_scroll_down(view, nscroll);
7796 		break;
7797 	case CTRL('l'):
7798 		view->count = 0;
7799 		tog_free_refs();
7800 		err = tog_load_refs(s->repo, s->sort_by_date);
7801 		if (err)
7802 			break;
7803 		ref_view_free_refs(s);
7804 		err = ref_view_load_refs(s);
7805 		break;
7806 	case KEY_RESIZE:
7807 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7808 			s->selected = view->nlines - 2;
7809 		break;
7810 	default:
7811 		view->count = 0;
7812 		break;
7813 	}
7814 
7815 	return err;
7816 }
7817 
7818 __dead static void
7819 usage_ref(void)
7820 {
7821 	endwin();
7822 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7823 	    getprogname());
7824 	exit(1);
7825 }
7826 
7827 static const struct got_error *
7828 cmd_ref(int argc, char *argv[])
7829 {
7830 	const struct got_error *error;
7831 	struct got_repository *repo = NULL;
7832 	struct got_worktree *worktree = NULL;
7833 	char *cwd = NULL, *repo_path = NULL;
7834 	int ch;
7835 	struct tog_view *view;
7836 	int *pack_fds = NULL;
7837 
7838 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7839 		switch (ch) {
7840 		case 'r':
7841 			repo_path = realpath(optarg, NULL);
7842 			if (repo_path == NULL)
7843 				return got_error_from_errno2("realpath",
7844 				    optarg);
7845 			break;
7846 		default:
7847 			usage_ref();
7848 			/* NOTREACHED */
7849 		}
7850 	}
7851 
7852 	argc -= optind;
7853 	argv += optind;
7854 
7855 	if (argc > 1)
7856 		usage_ref();
7857 
7858 	error = got_repo_pack_fds_open(&pack_fds);
7859 	if (error != NULL)
7860 		goto done;
7861 
7862 	if (repo_path == NULL) {
7863 		cwd = getcwd(NULL, 0);
7864 		if (cwd == NULL)
7865 			return got_error_from_errno("getcwd");
7866 		error = got_worktree_open(&worktree, cwd);
7867 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7868 			goto done;
7869 		if (worktree)
7870 			repo_path =
7871 			    strdup(got_worktree_get_repo_path(worktree));
7872 		else
7873 			repo_path = strdup(cwd);
7874 		if (repo_path == NULL) {
7875 			error = got_error_from_errno("strdup");
7876 			goto done;
7877 		}
7878 	}
7879 
7880 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7881 	if (error != NULL)
7882 		goto done;
7883 
7884 	init_curses();
7885 
7886 	error = apply_unveil(got_repo_get_path(repo), NULL);
7887 	if (error)
7888 		goto done;
7889 
7890 	error = tog_load_refs(repo, 0);
7891 	if (error)
7892 		goto done;
7893 
7894 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7895 	if (view == NULL) {
7896 		error = got_error_from_errno("view_open");
7897 		goto done;
7898 	}
7899 
7900 	error = open_ref_view(view, repo);
7901 	if (error)
7902 		goto done;
7903 
7904 	if (worktree) {
7905 		/* Release work tree lock. */
7906 		got_worktree_close(worktree);
7907 		worktree = NULL;
7908 	}
7909 	error = view_loop(view);
7910 done:
7911 	free(repo_path);
7912 	free(cwd);
7913 	if (repo) {
7914 		const struct got_error *close_err = got_repo_close(repo);
7915 		if (close_err)
7916 			error = close_err;
7917 	}
7918 	if (pack_fds) {
7919 		const struct got_error *pack_err =
7920 		    got_repo_pack_fds_close(pack_fds);
7921 		if (error == NULL)
7922 			error = pack_err;
7923 	}
7924 	tog_free_refs();
7925 	return error;
7926 }
7927 
7928 /*
7929  * If view was scrolled down to move the selected line into view when opening a
7930  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7931  */
7932 static void
7933 offset_selection_up(struct tog_view *view)
7934 {
7935 	switch (view->type) {
7936 	case TOG_VIEW_BLAME: {
7937 		struct tog_blame_view_state *s = &view->state.blame;
7938 		if (s->first_displayed_line == 1) {
7939 			s->selected_line = MAX(s->selected_line - view->offset,
7940 			    1);
7941 			break;
7942 		}
7943 		if (s->first_displayed_line > view->offset)
7944 			s->first_displayed_line -= view->offset;
7945 		else
7946 			s->first_displayed_line = 1;
7947 		s->selected_line += view->offset;
7948 		break;
7949 	}
7950 	case TOG_VIEW_LOG:
7951 		log_scroll_up(&view->state.log, view->offset);
7952 		view->state.log.selected += view->offset;
7953 		break;
7954 	case TOG_VIEW_REF:
7955 		ref_scroll_up(&view->state.ref, view->offset);
7956 		view->state.ref.selected += view->offset;
7957 		break;
7958 	case TOG_VIEW_TREE:
7959 		tree_scroll_up(&view->state.tree, view->offset);
7960 		view->state.tree.selected += view->offset;
7961 		break;
7962 	default:
7963 		break;
7964 	}
7965 
7966 	view->offset = 0;
7967 }
7968 
7969 /*
7970  * If the selected line is in the section of screen covered by the bottom split,
7971  * scroll down offset lines to move it into view and index its new position.
7972  */
7973 static const struct got_error *
7974 offset_selection_down(struct tog_view *view)
7975 {
7976 	const struct got_error	*err = NULL;
7977 	const struct got_error	*(*scrolld)(struct tog_view *, int);
7978 	int			*selected = NULL;
7979 	int			 header, offset;
7980 
7981 	switch (view->type) {
7982 	case TOG_VIEW_BLAME: {
7983 		struct tog_blame_view_state *s = &view->state.blame;
7984 		header = 3;
7985 		scrolld = NULL;
7986 		if (s->selected_line > view->nlines - header) {
7987 			offset = abs(view->nlines - s->selected_line - header);
7988 			s->first_displayed_line += offset;
7989 			s->selected_line -= offset;
7990 			view->offset = offset;
7991 		}
7992 		break;
7993 	}
7994 	case TOG_VIEW_LOG: {
7995 		struct tog_log_view_state *s = &view->state.log;
7996 		scrolld = &log_scroll_down;
7997 		header = view_is_parent_view(view) ? 3 : 2;
7998 		selected = &s->selected;
7999 		break;
8000 	}
8001 	case TOG_VIEW_REF: {
8002 		struct tog_ref_view_state *s = &view->state.ref;
8003 		scrolld = &ref_scroll_down;
8004 		header = 3;
8005 		selected = &s->selected;
8006 		break;
8007 	}
8008 	case TOG_VIEW_TREE: {
8009 		struct tog_tree_view_state *s = &view->state.tree;
8010 		scrolld = &tree_scroll_down;
8011 		header = 5;
8012 		selected = &s->selected;
8013 		break;
8014 	}
8015 	default:
8016 		selected = NULL;
8017 		scrolld = NULL;
8018 		header = 0;
8019 		break;
8020 	}
8021 
8022 	if (selected && *selected > view->nlines - header) {
8023 		offset = abs(view->nlines - *selected - header);
8024 		view->offset = offset;
8025 		if (scrolld && offset) {
8026 			err = scrolld(view, offset);
8027 			*selected -= offset;
8028 		}
8029 	}
8030 
8031 	return err;
8032 }
8033 
8034 static void
8035 list_commands(FILE *fp)
8036 {
8037 	size_t i;
8038 
8039 	fprintf(fp, "commands:");
8040 	for (i = 0; i < nitems(tog_commands); i++) {
8041 		const struct tog_cmd *cmd = &tog_commands[i];
8042 		fprintf(fp, " %s", cmd->name);
8043 	}
8044 	fputc('\n', fp);
8045 }
8046 
8047 __dead static void
8048 usage(int hflag, int status)
8049 {
8050 	FILE *fp = (status == 0) ? stdout : stderr;
8051 
8052 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8053 	    getprogname());
8054 	if (hflag) {
8055 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8056 		list_commands(fp);
8057 	}
8058 	exit(status);
8059 }
8060 
8061 static char **
8062 make_argv(int argc, ...)
8063 {
8064 	va_list ap;
8065 	char **argv;
8066 	int i;
8067 
8068 	va_start(ap, argc);
8069 
8070 	argv = calloc(argc, sizeof(char *));
8071 	if (argv == NULL)
8072 		err(1, "calloc");
8073 	for (i = 0; i < argc; i++) {
8074 		argv[i] = strdup(va_arg(ap, char *));
8075 		if (argv[i] == NULL)
8076 			err(1, "strdup");
8077 	}
8078 
8079 	va_end(ap);
8080 	return argv;
8081 }
8082 
8083 /*
8084  * Try to convert 'tog path' into a 'tog log path' command.
8085  * The user could simply have mistyped the command rather than knowingly
8086  * provided a path. So check whether argv[0] can in fact be resolved
8087  * to a path in the HEAD commit and print a special error if not.
8088  * This hack is for mpi@ <3
8089  */
8090 static const struct got_error *
8091 tog_log_with_path(int argc, char *argv[])
8092 {
8093 	const struct got_error *error = NULL, *close_err;
8094 	const struct tog_cmd *cmd = NULL;
8095 	struct got_repository *repo = NULL;
8096 	struct got_worktree *worktree = NULL;
8097 	struct got_object_id *commit_id = NULL, *id = NULL;
8098 	struct got_commit_object *commit = NULL;
8099 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8100 	char *commit_id_str = NULL, **cmd_argv = NULL;
8101 	int *pack_fds = NULL;
8102 
8103 	cwd = getcwd(NULL, 0);
8104 	if (cwd == NULL)
8105 		return got_error_from_errno("getcwd");
8106 
8107 	error = got_repo_pack_fds_open(&pack_fds);
8108 	if (error != NULL)
8109 		goto done;
8110 
8111 	error = got_worktree_open(&worktree, cwd);
8112 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8113 		goto done;
8114 
8115 	if (worktree)
8116 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8117 	else
8118 		repo_path = strdup(cwd);
8119 	if (repo_path == NULL) {
8120 		error = got_error_from_errno("strdup");
8121 		goto done;
8122 	}
8123 
8124 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8125 	if (error != NULL)
8126 		goto done;
8127 
8128 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8129 	    repo, worktree);
8130 	if (error)
8131 		goto done;
8132 
8133 	error = tog_load_refs(repo, 0);
8134 	if (error)
8135 		goto done;
8136 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8137 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8138 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8139 	if (error)
8140 		goto done;
8141 
8142 	if (worktree) {
8143 		got_worktree_close(worktree);
8144 		worktree = NULL;
8145 	}
8146 
8147 	error = got_object_open_as_commit(&commit, repo, commit_id);
8148 	if (error)
8149 		goto done;
8150 
8151 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8152 	if (error) {
8153 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8154 			goto done;
8155 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8156 		    getprogname(), argv[0]);
8157 		usage(1, 1);
8158 		/* not reached */
8159 	}
8160 
8161 	close_err = got_repo_close(repo);
8162 	if (error == NULL)
8163 		error = close_err;
8164 	repo = NULL;
8165 
8166 	error = got_object_id_str(&commit_id_str, commit_id);
8167 	if (error)
8168 		goto done;
8169 
8170 	cmd = &tog_commands[0]; /* log */
8171 	argc = 4;
8172 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8173 	error = cmd->cmd_main(argc, cmd_argv);
8174 done:
8175 	if (repo) {
8176 		close_err = got_repo_close(repo);
8177 		if (error == NULL)
8178 			error = close_err;
8179 	}
8180 	if (commit)
8181 		got_object_commit_close(commit);
8182 	if (worktree)
8183 		got_worktree_close(worktree);
8184 	if (pack_fds) {
8185 		const struct got_error *pack_err =
8186 		    got_repo_pack_fds_close(pack_fds);
8187 		if (error == NULL)
8188 			error = pack_err;
8189 	}
8190 	free(id);
8191 	free(commit_id_str);
8192 	free(commit_id);
8193 	free(cwd);
8194 	free(repo_path);
8195 	free(in_repo_path);
8196 	if (cmd_argv) {
8197 		int i;
8198 		for (i = 0; i < argc; i++)
8199 			free(cmd_argv[i]);
8200 		free(cmd_argv);
8201 	}
8202 	tog_free_refs();
8203 	return error;
8204 }
8205 
8206 int
8207 main(int argc, char *argv[])
8208 {
8209 	const struct got_error *error = NULL;
8210 	const struct tog_cmd *cmd = NULL;
8211 	int ch, hflag = 0, Vflag = 0;
8212 	char **cmd_argv = NULL;
8213 	static const struct option longopts[] = {
8214 	    { "version", no_argument, NULL, 'V' },
8215 	    { NULL, 0, NULL, 0}
8216 	};
8217 	char *diff_algo_str = NULL;
8218 
8219 	setlocale(LC_CTYPE, "");
8220 
8221 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8222 		switch (ch) {
8223 		case 'h':
8224 			hflag = 1;
8225 			break;
8226 		case 'V':
8227 			Vflag = 1;
8228 			break;
8229 		default:
8230 			usage(hflag, 1);
8231 			/* NOTREACHED */
8232 		}
8233 	}
8234 
8235 	argc -= optind;
8236 	argv += optind;
8237 	optind = 1;
8238 	optreset = 1;
8239 
8240 	if (Vflag) {
8241 		got_version_print_str();
8242 		return 0;
8243 	}
8244 
8245 #ifndef PROFILE
8246 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8247 	    NULL) == -1)
8248 		err(1, "pledge");
8249 #endif
8250 
8251 	if (argc == 0) {
8252 		if (hflag)
8253 			usage(hflag, 0);
8254 		/* Build an argument vector which runs a default command. */
8255 		cmd = &tog_commands[0];
8256 		argc = 1;
8257 		cmd_argv = make_argv(argc, cmd->name);
8258 	} else {
8259 		size_t i;
8260 
8261 		/* Did the user specify a command? */
8262 		for (i = 0; i < nitems(tog_commands); i++) {
8263 			if (strncmp(tog_commands[i].name, argv[0],
8264 			    strlen(argv[0])) == 0) {
8265 				cmd = &tog_commands[i];
8266 				break;
8267 			}
8268 		}
8269 	}
8270 
8271 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8272 	if (diff_algo_str) {
8273 		if (strcasecmp(diff_algo_str, "patience") == 0)
8274 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8275 		if (strcasecmp(diff_algo_str, "myers") == 0)
8276 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8277 	}
8278 
8279 	if (cmd == NULL) {
8280 		if (argc != 1)
8281 			usage(0, 1);
8282 		/* No command specified; try log with a path */
8283 		error = tog_log_with_path(argc, argv);
8284 	} else {
8285 		if (hflag)
8286 			cmd->cmd_usage();
8287 		else
8288 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8289 	}
8290 
8291 	endwin();
8292 	putchar('\n');
8293 	if (cmd_argv) {
8294 		int i;
8295 		for (i = 0; i < argc; i++)
8296 			free(cmd_argv[i]);
8297 		free(cmd_argv);
8298 	}
8299 
8300 	if (error && error->code != GOT_ERR_CANCELLED)
8301 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8302 	return 0;
8303 }