1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.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_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 };
107 
108 enum tog_view_mode {
109 	TOG_VIEW_SPLIT_NONE,
110 	TOG_VIEW_SPLIT_VERT,
111 	TOG_VIEW_SPLIT_HRZN
112 };
113 
114 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
115 
116 #define TOG_EOF_STRING	"(END)"
117 
118 struct commit_queue_entry {
119 	TAILQ_ENTRY(commit_queue_entry) entry;
120 	struct got_object_id *id;
121 	struct got_commit_object *commit;
122 	int idx;
123 };
124 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
125 struct commit_queue {
126 	int ncommits;
127 	struct commit_queue_head head;
128 };
129 
130 struct tog_color {
131 	STAILQ_ENTRY(tog_color) entry;
132 	regex_t regex;
133 	short colorpair;
134 };
135 STAILQ_HEAD(tog_colors, tog_color);
136 
137 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
138 static struct got_reflist_object_id_map *tog_refs_idmap;
139 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
140 
141 static const struct got_error *
142 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
143     struct got_reference* re2)
144 {
145 	const char *name1 = got_ref_get_name(re1);
146 	const char *name2 = got_ref_get_name(re2);
147 	int isbackup1, isbackup2;
148 
149 	/* Sort backup refs towards the bottom of the list. */
150 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
151 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
152 	if (!isbackup1 && isbackup2) {
153 		*cmp = -1;
154 		return NULL;
155 	} else if (isbackup1 && !isbackup2) {
156 		*cmp = 1;
157 		return NULL;
158 	}
159 
160 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
161 	return NULL;
162 }
163 
164 static const struct got_error *
165 tog_load_refs(struct got_repository *repo, int sort_by_date)
166 {
167 	const struct got_error *err;
168 
169 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
170 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
171 	    repo);
172 	if (err)
173 		return err;
174 
175 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
176 	    repo);
177 }
178 
179 static void
180 tog_free_refs(void)
181 {
182 	if (tog_refs_idmap) {
183 		got_reflist_object_id_map_free(tog_refs_idmap);
184 		tog_refs_idmap = NULL;
185 	}
186 	got_ref_list_free(&tog_refs);
187 }
188 
189 static const struct got_error *
190 add_color(struct tog_colors *colors, const char *pattern,
191     int idx, short color)
192 {
193 	const struct got_error *err = NULL;
194 	struct tog_color *tc;
195 	int regerr = 0;
196 
197 	if (idx < 1 || idx > COLOR_PAIRS - 1)
198 		return NULL;
199 
200 	init_pair(idx, color, -1);
201 
202 	tc = calloc(1, sizeof(*tc));
203 	if (tc == NULL)
204 		return got_error_from_errno("calloc");
205 	regerr = regcomp(&tc->regex, pattern,
206 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
207 	if (regerr) {
208 		static char regerr_msg[512];
209 		static char err_msg[512];
210 		regerror(regerr, &tc->regex, regerr_msg,
211 		    sizeof(regerr_msg));
212 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
213 		    regerr_msg);
214 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
215 		free(tc);
216 		return err;
217 	}
218 	tc->colorpair = idx;
219 	STAILQ_INSERT_HEAD(colors, tc, entry);
220 	return NULL;
221 }
222 
223 static void
224 free_colors(struct tog_colors *colors)
225 {
226 	struct tog_color *tc;
227 
228 	while (!STAILQ_EMPTY(colors)) {
229 		tc = STAILQ_FIRST(colors);
230 		STAILQ_REMOVE_HEAD(colors, entry);
231 		regfree(&tc->regex);
232 		free(tc);
233 	}
234 }
235 
236 static struct tog_color *
237 get_color(struct tog_colors *colors, int colorpair)
238 {
239 	struct tog_color *tc = NULL;
240 
241 	STAILQ_FOREACH(tc, colors, entry) {
242 		if (tc->colorpair == colorpair)
243 			return tc;
244 	}
245 
246 	return NULL;
247 }
248 
249 static int
250 default_color_value(const char *envvar)
251 {
252 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
253 		return COLOR_MAGENTA;
254 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
255 		return COLOR_CYAN;
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
257 		return COLOR_YELLOW;
258 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
259 		return COLOR_GREEN;
260 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
261 		return COLOR_MAGENTA;
262 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
263 		return COLOR_MAGENTA;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
265 		return COLOR_CYAN;
266 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
267 		return COLOR_GREEN;
268 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
269 		return COLOR_GREEN;
270 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
271 		return COLOR_CYAN;
272 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
273 		return COLOR_YELLOW;
274 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
275 		return COLOR_GREEN;
276 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
279 		return COLOR_YELLOW;
280 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
281 		return COLOR_CYAN;
282 
283 	return -1;
284 }
285 
286 static int
287 get_color_value(const char *envvar)
288 {
289 	const char *val = getenv(envvar);
290 
291 	if (val == NULL)
292 		return default_color_value(envvar);
293 
294 	if (strcasecmp(val, "black") == 0)
295 		return COLOR_BLACK;
296 	if (strcasecmp(val, "red") == 0)
297 		return COLOR_RED;
298 	if (strcasecmp(val, "green") == 0)
299 		return COLOR_GREEN;
300 	if (strcasecmp(val, "yellow") == 0)
301 		return COLOR_YELLOW;
302 	if (strcasecmp(val, "blue") == 0)
303 		return COLOR_BLUE;
304 	if (strcasecmp(val, "magenta") == 0)
305 		return COLOR_MAGENTA;
306 	if (strcasecmp(val, "cyan") == 0)
307 		return COLOR_CYAN;
308 	if (strcasecmp(val, "white") == 0)
309 		return COLOR_WHITE;
310 	if (strcasecmp(val, "default") == 0)
311 		return -1;
312 
313 	return default_color_value(envvar);
314 }
315 
316 
317 struct tog_diff_view_state {
318 	struct got_object_id *id1, *id2;
319 	const char *label1, *label2;
320 	FILE *f, *f1, *f2;
321 	int fd1, fd2;
322 	int first_displayed_line;
323 	int last_displayed_line;
324 	int eof;
325 	int diff_context;
326 	int ignore_whitespace;
327 	int force_text_diff;
328 	struct got_repository *repo;
329 	struct tog_colors colors;
330 	size_t nlines;
331 	off_t *line_offsets;
332 	int matched_line;
333 	int selected_line;
334 
335 	/* passed from log or blame view; may be NULL */
336 	struct tog_view *parent_view;
337 };
338 
339 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
340 static volatile sig_atomic_t tog_thread_error;
341 
342 struct tog_log_thread_args {
343 	pthread_cond_t need_commits;
344 	pthread_cond_t commit_loaded;
345 	int commits_needed;
346 	int load_all;
347 	struct got_commit_graph *graph;
348 	struct commit_queue *commits;
349 	const char *in_repo_path;
350 	struct got_object_id *start_id;
351 	struct got_repository *repo;
352 	int *pack_fds;
353 	int log_complete;
354 	sig_atomic_t *quit;
355 	struct commit_queue_entry **first_displayed_entry;
356 	struct commit_queue_entry **selected_entry;
357 	int *searching;
358 	int *search_next_done;
359 	regex_t *regex;
360 };
361 
362 struct tog_log_view_state {
363 	struct commit_queue commits;
364 	struct commit_queue_entry *first_displayed_entry;
365 	struct commit_queue_entry *last_displayed_entry;
366 	struct commit_queue_entry *selected_entry;
367 	int selected;
368 	char *in_repo_path;
369 	char *head_ref_name;
370 	int log_branches;
371 	struct got_repository *repo;
372 	struct got_object_id *start_id;
373 	sig_atomic_t quit;
374 	pthread_t thread;
375 	struct tog_log_thread_args thread_args;
376 	struct commit_queue_entry *matched_entry;
377 	struct commit_queue_entry *search_entry;
378 	struct tog_colors colors;
379 };
380 
381 #define TOG_COLOR_DIFF_MINUS		1
382 #define TOG_COLOR_DIFF_PLUS		2
383 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
384 #define TOG_COLOR_DIFF_META		4
385 #define TOG_COLOR_TREE_SUBMODULE	5
386 #define TOG_COLOR_TREE_SYMLINK		6
387 #define TOG_COLOR_TREE_DIRECTORY	7
388 #define TOG_COLOR_TREE_EXECUTABLE	8
389 #define TOG_COLOR_COMMIT		9
390 #define TOG_COLOR_AUTHOR		10
391 #define TOG_COLOR_DATE			11
392 #define TOG_COLOR_REFS_HEADS		12
393 #define TOG_COLOR_REFS_TAGS		13
394 #define TOG_COLOR_REFS_REMOTES		14
395 #define TOG_COLOR_REFS_BACKUP		15
396 
397 struct tog_blame_cb_args {
398 	struct tog_blame_line *lines; /* one per line */
399 	int nlines;
400 
401 	struct tog_view *view;
402 	struct got_object_id *commit_id;
403 	int *quit;
404 };
405 
406 struct tog_blame_thread_args {
407 	const char *path;
408 	struct got_repository *repo;
409 	struct tog_blame_cb_args *cb_args;
410 	int *complete;
411 	got_cancel_cb cancel_cb;
412 	void *cancel_arg;
413 };
414 
415 struct tog_blame {
416 	FILE *f;
417 	off_t filesize;
418 	struct tog_blame_line *lines;
419 	int nlines;
420 	off_t *line_offsets;
421 	pthread_t thread;
422 	struct tog_blame_thread_args thread_args;
423 	struct tog_blame_cb_args cb_args;
424 	const char *path;
425 	int *pack_fds;
426 };
427 
428 struct tog_blame_view_state {
429 	int first_displayed_line;
430 	int last_displayed_line;
431 	int selected_line;
432 	int last_diffed_line;
433 	int blame_complete;
434 	int eof;
435 	int done;
436 	struct got_object_id_queue blamed_commits;
437 	struct got_object_qid *blamed_commit;
438 	char *path;
439 	struct got_repository *repo;
440 	struct got_object_id *commit_id;
441 	struct tog_blame blame;
442 	int matched_line;
443 	struct tog_colors colors;
444 };
445 
446 struct tog_parent_tree {
447 	TAILQ_ENTRY(tog_parent_tree) entry;
448 	struct got_tree_object *tree;
449 	struct got_tree_entry *first_displayed_entry;
450 	struct got_tree_entry *selected_entry;
451 	int selected;
452 };
453 
454 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
455 
456 struct tog_tree_view_state {
457 	char *tree_label;
458 	struct got_object_id *commit_id;/* commit which this tree belongs to */
459 	struct got_tree_object *root;	/* the commit's root tree entry */
460 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
461 	struct got_tree_entry *first_displayed_entry;
462 	struct got_tree_entry *last_displayed_entry;
463 	struct got_tree_entry *selected_entry;
464 	int ndisplayed, selected, show_ids;
465 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
466 	char *head_ref_name;
467 	struct got_repository *repo;
468 	struct got_tree_entry *matched_entry;
469 	struct tog_colors colors;
470 };
471 
472 struct tog_reflist_entry {
473 	TAILQ_ENTRY(tog_reflist_entry) entry;
474 	struct got_reference *ref;
475 	int idx;
476 };
477 
478 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
479 
480 struct tog_ref_view_state {
481 	struct tog_reflist_head refs;
482 	struct tog_reflist_entry *first_displayed_entry;
483 	struct tog_reflist_entry *last_displayed_entry;
484 	struct tog_reflist_entry *selected_entry;
485 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
486 	struct got_repository *repo;
487 	struct tog_reflist_entry *matched_entry;
488 	struct tog_colors colors;
489 };
490 
491 /*
492  * We implement two types of views: parent views and child views.
493  *
494  * The 'Tab' key switches focus between a parent view and its child view.
495  * Child views are shown side-by-side to their parent view, provided
496  * there is enough screen estate.
497  *
498  * When a new view is opened from within a parent view, this new view
499  * becomes a child view of the parent view, replacing any existing child.
500  *
501  * When a new view is opened from within a child view, this new view
502  * becomes a parent view which will obscure the views below until the
503  * user quits the new parent view by typing 'q'.
504  *
505  * This list of views contains parent views only.
506  * Child views are only pointed to by their parent view.
507  */
508 TAILQ_HEAD(tog_view_list_head, tog_view);
509 
510 struct tog_view {
511 	TAILQ_ENTRY(tog_view) entry;
512 	WINDOW *window;
513 	PANEL *panel;
514 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
515 	int resized_y, resized_x; /* begin_y/x based on user resizing */
516 	int maxx, x; /* max column and current start column */
517 	int lines, cols; /* copies of LINES and COLS */
518 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
519 	int ch, count; /* current keymap and count prefix */
520 	int resize; /* set when in a resize event */
521 	int focussed; /* Only set on one parent or child view at a time. */
522 	int dying;
523 	struct tog_view *parent;
524 	struct tog_view *child;
525 
526 	/*
527 	 * This flag is initially set on parent views when a new child view
528 	 * is created. It gets toggled when the 'Tab' key switches focus
529 	 * between parent and child.
530 	 * The flag indicates whether focus should be passed on to our child
531 	 * view if this parent view gets picked for focus after another parent
532 	 * view was closed. This prevents child views from losing focus in such
533 	 * situations.
534 	 */
535 	int focus_child;
536 
537 	enum tog_view_mode mode;
538 	/* type-specific state */
539 	enum tog_view_type type;
540 	union {
541 		struct tog_diff_view_state diff;
542 		struct tog_log_view_state log;
543 		struct tog_blame_view_state blame;
544 		struct tog_tree_view_state tree;
545 		struct tog_ref_view_state ref;
546 	} state;
547 
548 	const struct got_error *(*show)(struct tog_view *);
549 	const struct got_error *(*input)(struct tog_view **,
550 	    struct tog_view *, int);
551 	const struct got_error *(*reset)(struct tog_view *);
552 	const struct got_error *(*close)(struct tog_view *);
553 
554 	const struct got_error *(*search_start)(struct tog_view *);
555 	const struct got_error *(*search_next)(struct tog_view *);
556 	int search_started;
557 	int searching;
558 #define TOG_SEARCH_FORWARD	1
559 #define TOG_SEARCH_BACKWARD	2
560 	int search_next_done;
561 #define TOG_SEARCH_HAVE_MORE	1
562 #define TOG_SEARCH_NO_MORE	2
563 #define TOG_SEARCH_HAVE_NONE	3
564 	regex_t regex;
565 	regmatch_t regmatch;
566 };
567 
568 static const struct got_error *open_diff_view(struct tog_view *,
569     struct got_object_id *, struct got_object_id *,
570     const char *, const char *, int, int, int, struct tog_view *,
571     struct got_repository *);
572 static const struct got_error *show_diff_view(struct tog_view *);
573 static const struct got_error *input_diff_view(struct tog_view **,
574     struct tog_view *, int);
575 static const struct got_error *reset_diff_view(struct tog_view *);
576 static const struct got_error* close_diff_view(struct tog_view *);
577 static const struct got_error *search_start_diff_view(struct tog_view *);
578 static const struct got_error *search_next_diff_view(struct tog_view *);
579 
580 static const struct got_error *open_log_view(struct tog_view *,
581     struct got_object_id *, struct got_repository *,
582     const char *, const char *, int);
583 static const struct got_error * show_log_view(struct tog_view *);
584 static const struct got_error *input_log_view(struct tog_view **,
585     struct tog_view *, int);
586 static const struct got_error *close_log_view(struct tog_view *);
587 static const struct got_error *search_start_log_view(struct tog_view *);
588 static const struct got_error *search_next_log_view(struct tog_view *);
589 
590 static const struct got_error *open_blame_view(struct tog_view *, char *,
591     struct got_object_id *, struct got_repository *);
592 static const struct got_error *show_blame_view(struct tog_view *);
593 static const struct got_error *input_blame_view(struct tog_view **,
594     struct tog_view *, int);
595 static const struct got_error *reset_blame_view(struct tog_view *);
596 static const struct got_error *close_blame_view(struct tog_view *);
597 static const struct got_error *search_start_blame_view(struct tog_view *);
598 static const struct got_error *search_next_blame_view(struct tog_view *);
599 
600 static const struct got_error *open_tree_view(struct tog_view *,
601     struct got_object_id *, const char *, struct got_repository *);
602 static const struct got_error *show_tree_view(struct tog_view *);
603 static const struct got_error *input_tree_view(struct tog_view **,
604     struct tog_view *, int);
605 static const struct got_error *close_tree_view(struct tog_view *);
606 static const struct got_error *search_start_tree_view(struct tog_view *);
607 static const struct got_error *search_next_tree_view(struct tog_view *);
608 
609 static const struct got_error *open_ref_view(struct tog_view *,
610     struct got_repository *);
611 static const struct got_error *show_ref_view(struct tog_view *);
612 static const struct got_error *input_ref_view(struct tog_view **,
613     struct tog_view *, int);
614 static const struct got_error *close_ref_view(struct tog_view *);
615 static const struct got_error *search_start_ref_view(struct tog_view *);
616 static const struct got_error *search_next_ref_view(struct tog_view *);
617 
618 static volatile sig_atomic_t tog_sigwinch_received;
619 static volatile sig_atomic_t tog_sigpipe_received;
620 static volatile sig_atomic_t tog_sigcont_received;
621 static volatile sig_atomic_t tog_sigint_received;
622 static volatile sig_atomic_t tog_sigterm_received;
623 
624 static void
625 tog_sigwinch(int signo)
626 {
627 	tog_sigwinch_received = 1;
628 }
629 
630 static void
631 tog_sigpipe(int signo)
632 {
633 	tog_sigpipe_received = 1;
634 }
635 
636 static void
637 tog_sigcont(int signo)
638 {
639 	tog_sigcont_received = 1;
640 }
641 
642 static void
643 tog_sigint(int signo)
644 {
645 	tog_sigint_received = 1;
646 }
647 
648 static void
649 tog_sigterm(int signo)
650 {
651 	tog_sigterm_received = 1;
652 }
653 
654 static int
655 tog_fatal_signal_received(void)
656 {
657 	return (tog_sigpipe_received ||
658 	    tog_sigint_received || tog_sigint_received);
659 }
660 
661 static const struct got_error *
662 view_close(struct tog_view *view)
663 {
664 	const struct got_error *err = NULL, *child_err = NULL;
665 
666 	if (view->child) {
667 		child_err = view_close(view->child);
668 		view->child = NULL;
669 	}
670 	if (view->close)
671 		err = view->close(view);
672 	if (view->panel)
673 		del_panel(view->panel);
674 	if (view->window)
675 		delwin(view->window);
676 	free(view);
677 	return err ? err : child_err;
678 }
679 
680 static struct tog_view *
681 view_open(int nlines, int ncols, int begin_y, int begin_x,
682     enum tog_view_type type)
683 {
684 	struct tog_view *view = calloc(1, sizeof(*view));
685 
686 	if (view == NULL)
687 		return NULL;
688 
689 	view->type = type;
690 	view->lines = LINES;
691 	view->cols = COLS;
692 	view->nlines = nlines ? nlines : LINES - begin_y;
693 	view->ncols = ncols ? ncols : COLS - begin_x;
694 	view->begin_y = begin_y;
695 	view->begin_x = begin_x;
696 	view->window = newwin(nlines, ncols, begin_y, begin_x);
697 	if (view->window == NULL) {
698 		view_close(view);
699 		return NULL;
700 	}
701 	view->panel = new_panel(view->window);
702 	if (view->panel == NULL ||
703 	    set_panel_userptr(view->panel, view) != OK) {
704 		view_close(view);
705 		return NULL;
706 	}
707 
708 	keypad(view->window, TRUE);
709 	return view;
710 }
711 
712 static int
713 view_split_begin_x(int begin_x)
714 {
715 	if (begin_x > 0 || COLS < 120)
716 		return 0;
717 	return (COLS - MAX(COLS / 2, 80));
718 }
719 
720 /* XXX Stub till we decide what to do. */
721 static int
722 view_split_begin_y(int lines)
723 {
724 	return lines * HSPLIT_SCALE;
725 }
726 
727 static const struct got_error *view_resize(struct tog_view *);
728 
729 static const struct got_error *
730 view_splitscreen(struct tog_view *view)
731 {
732 	const struct got_error *err = NULL;
733 
734 	if (!view->resize && view->mode == TOG_VIEW_SPLIT_HRZN) {
735 		if (view->resized_y && view->resized_y < view->lines)
736 			view->begin_y = view->resized_y;
737 		else
738 			view->begin_y = view_split_begin_y(view->nlines);
739 		view->begin_x = 0;
740 	} else if (!view->resize) {
741 		if (view->resized_x && view->resized_x < view->cols - 1 &&
742 		    view->cols > 119)
743 			view->begin_x = view->resized_x;
744 		else
745 			view->begin_x = view_split_begin_x(0);
746 		view->begin_y = 0;
747 	}
748 	view->nlines = LINES - view->begin_y;
749 	view->ncols = COLS - view->begin_x;
750 	view->lines = LINES;
751 	view->cols = COLS;
752 	err = view_resize(view);
753 	if (err)
754 		return err;
755 
756 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
757 		view->parent->nlines = view->begin_y;
758 
759 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
760 		return got_error_from_errno("mvwin");
761 
762 	return NULL;
763 }
764 
765 static const struct got_error *
766 view_fullscreen(struct tog_view *view)
767 {
768 	const struct got_error *err = NULL;
769 
770 	view->begin_x = 0;
771 	view->begin_y = view->resize ? view->begin_y : 0;
772 	view->nlines = view->resize ? view->nlines : LINES;
773 	view->ncols = COLS;
774 	view->lines = LINES;
775 	view->cols = COLS;
776 	err = view_resize(view);
777 	if (err)
778 		return err;
779 
780 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
781 		return got_error_from_errno("mvwin");
782 
783 	return NULL;
784 }
785 
786 static int
787 view_is_parent_view(struct tog_view *view)
788 {
789 	return view->parent == NULL;
790 }
791 
792 static int
793 view_is_splitscreen(struct tog_view *view)
794 {
795 	return view->begin_x > 0 || view->begin_y > 0;
796 }
797 
798 static int
799 view_is_fullscreen(struct tog_view *view)
800 {
801 	return view->nlines == LINES && view->ncols == COLS;
802 }
803 
804 static int
805 view_is_hsplit_top(struct tog_view *view)
806 {
807 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
808 	    view_is_splitscreen(view->child);
809 }
810 
811 static void
812 view_border(struct tog_view *view)
813 {
814 	PANEL *panel;
815 	const struct tog_view *view_above;
816 
817 	if (view->parent)
818 		return view_border(view->parent);
819 
820 	panel = panel_above(view->panel);
821 	if (panel == NULL)
822 		return;
823 
824 	view_above = panel_userptr(panel);
825 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
826 		mvwhline(view->window, view_above->begin_y - 1,
827 		    view->begin_x, got_locale_is_utf8() ?
828 		    ACS_HLINE : '-', view->ncols);
829 	else
830 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
831 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
832 }
833 
834 static const struct got_error *view_init_hsplit(struct tog_view *, int);
835 static const struct got_error *request_log_commits(struct tog_view *);
836 static const struct got_error *offset_selection_down(struct tog_view *);
837 static void offset_selection_up(struct tog_view *);
838 static void view_get_split(struct tog_view *, int *, int *);
839 
840 static const struct got_error *
841 view_resize(struct tog_view *view)
842 {
843 	const struct got_error	*err = NULL;
844 	int			 dif, nlines, ncols;
845 
846 	dif = LINES - view->lines;  /* line difference */
847 
848 	if (view->lines > LINES)
849 		nlines = view->nlines - (view->lines - LINES);
850 	else
851 		nlines = view->nlines + (LINES - view->lines);
852 	if (view->cols > COLS)
853 		ncols = view->ncols - (view->cols - COLS);
854 	else
855 		ncols = view->ncols + (COLS - view->cols);
856 
857 	if (view->child) {
858 		int hs = view->child->begin_y;
859 
860 		if (!view_is_fullscreen(view))
861 			view->child->begin_x = view_split_begin_x(view->begin_x);
862 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
863 		    view->child->begin_x == 0) {
864 			ncols = COLS;
865 
866 			view_fullscreen(view->child);
867 			if (view->child->focussed)
868 				show_panel(view->child->panel);
869 			else
870 				show_panel(view->panel);
871 		} else {
872 			ncols = view->child->begin_x;
873 
874 			view_splitscreen(view->child);
875 			show_panel(view->child->panel);
876 		}
877 		/*
878 		 * Request commits if terminal height was increased in a log
879 		 * view so we have enough commits loaded to populate the view.
880 		 */
881 		if (view->type == TOG_VIEW_LOG && dif > 0) {
882 			struct tog_log_view_state *ts = &view->state.log;
883 
884 			if (ts->commits.ncommits < ts->selected_entry->idx +
885 			    view->lines - ts->selected) {
886 				view->nscrolled = ts->selected_entry->idx +
887 				    view->lines - ts->selected -
888 				    ts->commits.ncommits + dif;
889 				err = request_log_commits(view);
890 				if (err)
891 					return err;
892 			}
893 		}
894 
895 		/*
896 		 * XXX This is ugly and needs to be moved into the above
897 		 * logic but "works" for now and my attempts at moving it
898 		 * break either 'tab' or 'F' key maps in horizontal splits.
899 		 */
900 		if (hs) {
901 			err = view_splitscreen(view->child);
902 			if (err)
903 				return err;
904 			if (dif < 0) { /* top split decreased */
905 				err = offset_selection_down(view);
906 				if (err)
907 					return err;
908 			}
909 			view_border(view);
910 			update_panels();
911 			doupdate();
912 			show_panel(view->child->panel);
913 			nlines = view->nlines;
914 		}
915 	} else if (view->parent == NULL)
916 		ncols = COLS;
917 
918 	if (wresize(view->window, nlines, ncols) == ERR)
919 		return got_error_from_errno("wresize");
920 	if (replace_panel(view->panel, view->window) == ERR)
921 		return got_error_from_errno("replace_panel");
922 	wclear(view->window);
923 
924 	view->nlines = nlines;
925 	view->ncols = ncols;
926 	view->lines = LINES;
927 	view->cols = COLS;
928 
929 	return NULL;
930 }
931 
932 static void
933 view_adjust_offset(struct tog_view *view, int n)
934 {
935 	if (n == 0)
936 		return;
937 
938 	if (view->parent && view->parent->offset) {
939 		if (view->parent->offset + n >= 0)
940 			view->parent->offset += n;
941 		else
942 			view->parent->offset = 0;
943 	} else if (view->offset) {
944 		if (view->offset - n >= 0)
945 			view->offset -= n;
946 		else
947 			view->offset = 0;
948 	}
949 }
950 
951 static const struct got_error *
952 view_resize_split(struct tog_view *view, int resize)
953 {
954 	const struct got_error	*err = NULL;
955 	struct tog_view		*v = NULL;
956 
957 	if (view->parent)
958 		v = view->parent;
959 	else
960 		v = view;
961 
962 	if (!v->child || !view_is_splitscreen(v->child))
963 		return NULL;
964 
965 	v->resize = v->child->resize = resize;  /* lock for resize event */
966 
967 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
968 		if (v->child->resized_y)
969 			v->child->begin_y = v->child->resized_y;
970 		if (view->parent)
971 			v->child->begin_y -= resize;
972 		else
973 			v->child->begin_y += resize;
974 		if (v->child->begin_y < 3) {
975 			view->count = 0;
976 			v->child->begin_y = 3;
977 		} else if (v->child->begin_y > LINES - 1) {
978 			view->count = 0;
979 			v->child->begin_y = LINES - 1;
980 		}
981 		v->ncols = COLS;
982 		v->child->ncols = COLS;
983 		view_adjust_offset(view, resize);
984 		err = view_init_hsplit(v, v->child->begin_y);
985 		if (err)
986 			return err;
987 		v->child->resized_y = v->child->begin_y;
988 	} else {
989 		if (v->child->resized_x)
990 			v->child->begin_x = v->child->resized_x;
991 		if (view->parent)
992 			v->child->begin_x -= resize;
993 		else
994 			v->child->begin_x += resize;
995 		if (v->child->begin_x < 11) {
996 			view->count = 0;
997 			v->child->begin_x = 11;
998 		} else if (v->child->begin_x > COLS - 1) {
999 			view->count = 0;
1000 			v->child->begin_x = COLS - 1;
1001 		}
1002 		v->child->resized_x = v->child->begin_x;
1003 	}
1004 
1005 	v->child->mode = v->mode;
1006 	v->child->nlines = v->lines - v->child->begin_y;
1007 	v->child->ncols = v->cols - v->child->begin_x;
1008 	v->focus_child = 1;
1009 
1010 	err = view_fullscreen(v);
1011 	if (err)
1012 		return err;
1013 	err = view_splitscreen(v->child);
1014 	if (err)
1015 		return err;
1016 
1017 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1018 		err = offset_selection_down(v->child);
1019 		if (err)
1020 			return err;
1021 	}
1022 
1023 	if (v->type == TOG_VIEW_LOG)
1024 		err = request_log_commits(v);
1025 	else if (v->child->type == TOG_VIEW_LOG)
1026 		err = request_log_commits(v->child);
1027 
1028 	v->resize = v->child->resize = 0;
1029 
1030 	return err;
1031 }
1032 
1033 static void
1034 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1035 {
1036 	struct tog_view *v = src->child ? src->child : src;
1037 
1038 	dst->resized_x = v->resized_x;
1039 	dst->resized_y = v->resized_y;
1040 }
1041 
1042 static const struct got_error *
1043 view_close_child(struct tog_view *view)
1044 {
1045 	const struct got_error *err = NULL;
1046 
1047 	if (view->child == NULL)
1048 		return NULL;
1049 
1050 	err = view_close(view->child);
1051 	view->child = NULL;
1052 	return err;
1053 }
1054 
1055 static const struct got_error *
1056 view_set_child(struct tog_view *view, struct tog_view *child)
1057 {
1058 	const struct got_error *err = NULL;
1059 
1060 	view->child = child;
1061 	child->parent = view;
1062 
1063 	err = view_resize(view);
1064 	if (err)
1065 		return err;
1066 
1067 	if (view->child->resized_x || view->child->resized_y)
1068 		err = view_resize_split(view, 0);
1069 
1070 	return err;
1071 }
1072 
1073 static void
1074 tog_resizeterm(void)
1075 {
1076 	int cols, lines;
1077 	struct winsize size;
1078 
1079 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1080 		cols = 80;     /* Default */
1081 		lines = 24;
1082 	} else {
1083 		cols = size.ws_col;
1084 		lines = size.ws_row;
1085 	}
1086 	resize_term(lines, cols);
1087 }
1088 
1089 static const struct got_error *
1090 view_search_start(struct tog_view *view)
1091 {
1092 	const struct got_error *err = NULL;
1093 	struct tog_view *v = view;
1094 	char pattern[1024];
1095 	int ret;
1096 
1097 	if (view->search_started) {
1098 		regfree(&view->regex);
1099 		view->searching = 0;
1100 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1101 	}
1102 	view->search_started = 0;
1103 
1104 	if (view->nlines < 1)
1105 		return NULL;
1106 
1107 	if (view_is_hsplit_top(view))
1108 		v = view->child;
1109 
1110 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1111 	wclrtoeol(v->window);
1112 
1113 	nodelay(view->window, FALSE);  /* block for search term input */
1114 	nocbreak();
1115 	echo();
1116 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1117 	wrefresh(v->window);
1118 	cbreak();
1119 	noecho();
1120 	nodelay(view->window, TRUE);
1121 	if (ret == ERR)
1122 		return NULL;
1123 
1124 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1125 		err = view->search_start(view);
1126 		if (err) {
1127 			regfree(&view->regex);
1128 			return err;
1129 		}
1130 		view->search_started = 1;
1131 		view->searching = TOG_SEARCH_FORWARD;
1132 		view->search_next_done = 0;
1133 		view->search_next(view);
1134 	}
1135 
1136 	return NULL;
1137 }
1138 
1139 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1140 static const struct got_error *
1141 switch_split(struct tog_view *view)
1142 {
1143 	const struct got_error	*err = NULL;
1144 	struct tog_view		*v = NULL;
1145 
1146 	if (view->parent)
1147 		v = view->parent;
1148 	else
1149 		v = view;
1150 
1151 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1152 		v->mode = TOG_VIEW_SPLIT_VERT;
1153 	else
1154 		v->mode = TOG_VIEW_SPLIT_HRZN;
1155 
1156 	if (!v->child)
1157 		return NULL;
1158 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1159 		v->mode = TOG_VIEW_SPLIT_NONE;
1160 
1161 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1162 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1163 		v->child->begin_y = v->child->resized_y;
1164 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1165 		v->child->begin_x = v->child->resized_x;
1166 
1167 
1168 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1169 		v->ncols = COLS;
1170 		v->child->ncols = COLS;
1171 		v->child->nscrolled = LINES - v->child->nlines;
1172 
1173 		err = view_init_hsplit(v, v->child->begin_y);
1174 		if (err)
1175 			return err;
1176 	}
1177 	v->child->mode = v->mode;
1178 	v->child->nlines = v->lines - v->child->begin_y;
1179 	v->focus_child = 1;
1180 
1181 	err = view_fullscreen(v);
1182 	if (err)
1183 		return err;
1184 	err = view_splitscreen(v->child);
1185 	if (err)
1186 		return err;
1187 
1188 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1189 		v->mode = TOG_VIEW_SPLIT_VERT;
1190 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1191 		err = offset_selection_down(v);
1192 		err = offset_selection_down(v->child);
1193 	} else {
1194 		offset_selection_up(v);
1195 		offset_selection_up(v->child);
1196 	}
1197 	if (v->type == TOG_VIEW_LOG)
1198 		err = request_log_commits(v);
1199 	else if (v->child->type == TOG_VIEW_LOG)
1200 		err = request_log_commits(v->child);
1201 
1202 	return err;
1203 }
1204 
1205 /*
1206  * Compute view->count from numeric input. Assign total to view->count and
1207  * return first non-numeric key entered.
1208  */
1209 static int
1210 get_compound_key(struct tog_view *view, int c)
1211 {
1212 	struct tog_view	*v = view;
1213 	int		 x, n = 0;
1214 
1215 	if (view_is_hsplit_top(view))
1216 		v = view->child;
1217 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1218 		v = view->parent;
1219 
1220 	view->count = 0;
1221 	cbreak();  /* block for input */
1222 	wmove(v->window, v->nlines - 1, 0);
1223 	wclrtoeol(v->window);
1224 	waddch(v->window, ':');
1225 
1226 	do {
1227 		x = getcurx(v->window);
1228 		if (x != ERR && x < view->ncols) {
1229 			waddch(v->window, c);
1230 			wrefresh(v->window);
1231 		}
1232 
1233 		/*
1234 		 * Don't overflow. Max valid request should be the greatest
1235 		 * between the longest and total lines; cap at 10 million.
1236 		 */
1237 		if (n >= 9999999)
1238 			n = 9999999;
1239 		else
1240 			n = n * 10 + (c - '0');
1241 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1242 
1243 	/* Massage excessive or inapplicable values at the input handler. */
1244 	view->count = n;
1245 
1246 	return c;
1247 }
1248 
1249 static const struct got_error *
1250 view_input(struct tog_view **new, int *done, struct tog_view *view,
1251     struct tog_view_list_head *views)
1252 {
1253 	const struct got_error *err = NULL;
1254 	struct tog_view *v;
1255 	int ch, errcode;
1256 
1257 	*new = NULL;
1258 
1259 	/* Clear "no matches" indicator. */
1260 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1261 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1262 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1263 		view->count = 0;
1264 	}
1265 
1266 	if (view->searching && !view->search_next_done) {
1267 		errcode = pthread_mutex_unlock(&tog_mutex);
1268 		if (errcode)
1269 			return got_error_set_errno(errcode,
1270 			    "pthread_mutex_unlock");
1271 		sched_yield();
1272 		errcode = pthread_mutex_lock(&tog_mutex);
1273 		if (errcode)
1274 			return got_error_set_errno(errcode,
1275 			    "pthread_mutex_lock");
1276 		view->search_next(view);
1277 		return NULL;
1278 	}
1279 
1280 	nodelay(view->window, FALSE);
1281 	/* Allow threads to make progress while we are waiting for input. */
1282 	errcode = pthread_mutex_unlock(&tog_mutex);
1283 	if (errcode)
1284 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1285 	/* If we have an unfinished count, let C-g or backspace abort. */
1286 	if (view->count && --view->count) {
1287 		cbreak();
1288 		nodelay(view->window, TRUE);
1289 		ch = wgetch(view->window);
1290 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1291 			view->count = 0;
1292 		else
1293 			ch = view->ch;
1294 	} else {
1295 		ch = wgetch(view->window);
1296 		if (ch >= '1' && ch  <= '9')
1297 			view->ch = ch = get_compound_key(view, ch);
1298 	}
1299 	errcode = pthread_mutex_lock(&tog_mutex);
1300 	if (errcode)
1301 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1302 	nodelay(view->window, TRUE);
1303 
1304 	if (tog_sigwinch_received || tog_sigcont_received) {
1305 		tog_resizeterm();
1306 		tog_sigwinch_received = 0;
1307 		tog_sigcont_received = 0;
1308 		TAILQ_FOREACH(v, views, entry) {
1309 			err = view_resize(v);
1310 			if (err)
1311 				return err;
1312 			err = v->input(new, v, KEY_RESIZE);
1313 			if (err)
1314 				return err;
1315 			if (v->child) {
1316 				err = view_resize(v->child);
1317 				if (err)
1318 					return err;
1319 				err = v->child->input(new, v->child,
1320 				    KEY_RESIZE);
1321 				if (err)
1322 					return err;
1323 				if (v->child->resized_x || v->child->resized_y) {
1324 					err = view_resize_split(v, 0);
1325 					if (err)
1326 						return err;
1327 				}
1328 			}
1329 		}
1330 	}
1331 
1332 	switch (ch) {
1333 	case '\t':
1334 		view->count = 0;
1335 		if (view->child) {
1336 			view->focussed = 0;
1337 			view->child->focussed = 1;
1338 			view->focus_child = 1;
1339 		} else if (view->parent) {
1340 			view->focussed = 0;
1341 			view->parent->focussed = 1;
1342 			view->parent->focus_child = 0;
1343 			if (!view_is_splitscreen(view)) {
1344 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1345 				    view->parent->type == TOG_VIEW_LOG) {
1346 					err = request_log_commits(view->parent);
1347 					if (err)
1348 						return err;
1349 				}
1350 				offset_selection_up(view->parent);
1351 				err = view_fullscreen(view->parent);
1352 				if (err)
1353 					return err;
1354 			}
1355 		}
1356 		break;
1357 	case 'q':
1358 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1359 			if (view->parent->type == TOG_VIEW_LOG) {
1360 				/* might need more commits to fill fullscreen */
1361 				err = request_log_commits(view->parent);
1362 				if (err)
1363 					break;
1364 			}
1365 			offset_selection_up(view->parent);
1366 		}
1367 		err = view->input(new, view, ch);
1368 		view->dying = 1;
1369 		break;
1370 	case 'Q':
1371 		*done = 1;
1372 		break;
1373 	case 'F':
1374 		view->count = 0;
1375 		if (view_is_parent_view(view)) {
1376 			if (view->child == NULL)
1377 				break;
1378 			if (view_is_splitscreen(view->child)) {
1379 				view->focussed = 0;
1380 				view->child->focussed = 1;
1381 				err = view_fullscreen(view->child);
1382 			} else {
1383 				err = view_splitscreen(view->child);
1384 				if (!err)
1385 					err = view_resize_split(view, 0);
1386 			}
1387 			if (err)
1388 				break;
1389 			err = view->child->input(new, view->child,
1390 			    KEY_RESIZE);
1391 		} else {
1392 			if (view_is_splitscreen(view)) {
1393 				view->parent->focussed = 0;
1394 				view->focussed = 1;
1395 				err = view_fullscreen(view);
1396 			} else {
1397 				err = view_splitscreen(view);
1398 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1399 					err = view_resize(view->parent);
1400 				if (!err)
1401 					err = view_resize_split(view, 0);
1402 			}
1403 			if (err)
1404 				break;
1405 			err = view->input(new, view, KEY_RESIZE);
1406 		}
1407 		if (err)
1408 			break;
1409 		if (view->type == TOG_VIEW_LOG) {
1410 			err = request_log_commits(view);
1411 			if (err)
1412 				break;
1413 		}
1414 		if (view->parent)
1415 			err = offset_selection_down(view->parent);
1416 		if (!err)
1417 			err = offset_selection_down(view);
1418 		break;
1419 	case 'S':
1420 		view->count = 0;
1421 		err = switch_split(view);
1422 		break;
1423 	case '-':
1424 		err = view_resize_split(view, -1);
1425 		break;
1426 	case '+':
1427 		err = view_resize_split(view, 1);
1428 		break;
1429 	case KEY_RESIZE:
1430 		break;
1431 	case '/':
1432 		view->count = 0;
1433 		if (view->search_start)
1434 			view_search_start(view);
1435 		else
1436 			err = view->input(new, view, ch);
1437 		break;
1438 	case 'N':
1439 	case 'n':
1440 		if (view->search_started && view->search_next) {
1441 			view->searching = (ch == 'n' ?
1442 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1443 			view->search_next_done = 0;
1444 			view->search_next(view);
1445 		} else
1446 			err = view->input(new, view, ch);
1447 		break;
1448 	case 'A':
1449 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1450 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1451 		else
1452 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1453 		TAILQ_FOREACH(v, views, entry) {
1454 			if (v->reset) {
1455 				err = v->reset(v);
1456 				if (err)
1457 					return err;
1458 			}
1459 			if (v->child && v->child->reset) {
1460 				err = v->child->reset(v->child);
1461 				if (err)
1462 					return err;
1463 			}
1464 		}
1465 		break;
1466 	default:
1467 		err = view->input(new, view, ch);
1468 		break;
1469 	}
1470 
1471 	return err;
1472 }
1473 
1474 static int
1475 view_needs_focus_indication(struct tog_view *view)
1476 {
1477 	if (view_is_parent_view(view)) {
1478 		if (view->child == NULL || view->child->focussed)
1479 			return 0;
1480 		if (!view_is_splitscreen(view->child))
1481 			return 0;
1482 	} else if (!view_is_splitscreen(view))
1483 		return 0;
1484 
1485 	return view->focussed;
1486 }
1487 
1488 static const struct got_error *
1489 view_loop(struct tog_view *view)
1490 {
1491 	const struct got_error *err = NULL;
1492 	struct tog_view_list_head views;
1493 	struct tog_view *new_view;
1494 	char *mode;
1495 	int fast_refresh = 10;
1496 	int done = 0, errcode;
1497 
1498 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1499 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1500 		view->mode = TOG_VIEW_SPLIT_VERT;
1501 	else
1502 		view->mode = TOG_VIEW_SPLIT_HRZN;
1503 
1504 	errcode = pthread_mutex_lock(&tog_mutex);
1505 	if (errcode)
1506 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1507 
1508 	TAILQ_INIT(&views);
1509 	TAILQ_INSERT_HEAD(&views, view, entry);
1510 
1511 	view->focussed = 1;
1512 	err = view->show(view);
1513 	if (err)
1514 		return err;
1515 	update_panels();
1516 	doupdate();
1517 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1518 	    !tog_fatal_signal_received()) {
1519 		/* Refresh fast during initialization, then become slower. */
1520 		if (fast_refresh && fast_refresh-- == 0)
1521 			halfdelay(10); /* switch to once per second */
1522 
1523 		err = view_input(&new_view, &done, view, &views);
1524 		if (err)
1525 			break;
1526 		if (view->dying) {
1527 			struct tog_view *v, *prev = NULL;
1528 
1529 			if (view_is_parent_view(view))
1530 				prev = TAILQ_PREV(view, tog_view_list_head,
1531 				    entry);
1532 			else if (view->parent)
1533 				prev = view->parent;
1534 
1535 			if (view->parent) {
1536 				view->parent->child = NULL;
1537 				view->parent->focus_child = 0;
1538 				/* Restore fullscreen line height. */
1539 				view->parent->nlines = view->parent->lines;
1540 				err = view_resize(view->parent);
1541 				if (err)
1542 					break;
1543 				/* Make resized splits persist. */
1544 				view_transfer_size(view->parent, view);
1545 			} else
1546 				TAILQ_REMOVE(&views, view, entry);
1547 
1548 			err = view_close(view);
1549 			if (err)
1550 				goto done;
1551 
1552 			view = NULL;
1553 			TAILQ_FOREACH(v, &views, entry) {
1554 				if (v->focussed)
1555 					break;
1556 			}
1557 			if (view == NULL && new_view == NULL) {
1558 				/* No view has focus. Try to pick one. */
1559 				if (prev)
1560 					view = prev;
1561 				else if (!TAILQ_EMPTY(&views)) {
1562 					view = TAILQ_LAST(&views,
1563 					    tog_view_list_head);
1564 				}
1565 				if (view) {
1566 					if (view->focus_child) {
1567 						view->child->focussed = 1;
1568 						view = view->child;
1569 					} else
1570 						view->focussed = 1;
1571 				}
1572 			}
1573 		}
1574 		if (new_view) {
1575 			struct tog_view *v, *t;
1576 			/* Only allow one parent view per type. */
1577 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1578 				if (v->type != new_view->type)
1579 					continue;
1580 				TAILQ_REMOVE(&views, v, entry);
1581 				err = view_close(v);
1582 				if (err)
1583 					goto done;
1584 				break;
1585 			}
1586 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1587 			view = new_view;
1588 		}
1589 		if (view) {
1590 			if (view_is_parent_view(view)) {
1591 				if (view->child && view->child->focussed)
1592 					view = view->child;
1593 			} else {
1594 				if (view->parent && view->parent->focussed)
1595 					view = view->parent;
1596 			}
1597 			show_panel(view->panel);
1598 			if (view->child && view_is_splitscreen(view->child))
1599 				show_panel(view->child->panel);
1600 			if (view->parent && view_is_splitscreen(view)) {
1601 				err = view->parent->show(view->parent);
1602 				if (err)
1603 					goto done;
1604 			}
1605 			err = view->show(view);
1606 			if (err)
1607 				goto done;
1608 			if (view->child) {
1609 				err = view->child->show(view->child);
1610 				if (err)
1611 					goto done;
1612 			}
1613 			update_panels();
1614 			doupdate();
1615 		}
1616 	}
1617 done:
1618 	while (!TAILQ_EMPTY(&views)) {
1619 		const struct got_error *close_err;
1620 		view = TAILQ_FIRST(&views);
1621 		TAILQ_REMOVE(&views, view, entry);
1622 		close_err = view_close(view);
1623 		if (close_err && err == NULL)
1624 			err = close_err;
1625 	}
1626 
1627 	errcode = pthread_mutex_unlock(&tog_mutex);
1628 	if (errcode && err == NULL)
1629 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1630 
1631 	return err;
1632 }
1633 
1634 __dead static void
1635 usage_log(void)
1636 {
1637 	endwin();
1638 	fprintf(stderr,
1639 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1640 	    getprogname());
1641 	exit(1);
1642 }
1643 
1644 /* Create newly allocated wide-character string equivalent to a byte string. */
1645 static const struct got_error *
1646 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1647 {
1648 	char *vis = NULL;
1649 	const struct got_error *err = NULL;
1650 
1651 	*ws = NULL;
1652 	*wlen = mbstowcs(NULL, s, 0);
1653 	if (*wlen == (size_t)-1) {
1654 		int vislen;
1655 		if (errno != EILSEQ)
1656 			return got_error_from_errno("mbstowcs");
1657 
1658 		/* byte string invalid in current encoding; try to "fix" it */
1659 		err = got_mbsavis(&vis, &vislen, s);
1660 		if (err)
1661 			return err;
1662 		*wlen = mbstowcs(NULL, vis, 0);
1663 		if (*wlen == (size_t)-1) {
1664 			err = got_error_from_errno("mbstowcs"); /* give up */
1665 			goto done;
1666 		}
1667 	}
1668 
1669 	*ws = calloc(*wlen + 1, sizeof(**ws));
1670 	if (*ws == NULL) {
1671 		err = got_error_from_errno("calloc");
1672 		goto done;
1673 	}
1674 
1675 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1676 		err = got_error_from_errno("mbstowcs");
1677 done:
1678 	free(vis);
1679 	if (err) {
1680 		free(*ws);
1681 		*ws = NULL;
1682 		*wlen = 0;
1683 	}
1684 	return err;
1685 }
1686 
1687 static const struct got_error *
1688 expand_tab(char **ptr, const char *src)
1689 {
1690 	char	*dst;
1691 	size_t	 len, n, idx = 0, sz = 0;
1692 
1693 	*ptr = NULL;
1694 	n = len = strlen(src);
1695 	dst = malloc(n + 1);
1696 	if (dst == NULL)
1697 		return got_error_from_errno("malloc");
1698 
1699 	while (idx < len && src[idx]) {
1700 		const char c = src[idx];
1701 
1702 		if (c == '\t') {
1703 			size_t nb = TABSIZE - sz % TABSIZE;
1704 			char *p;
1705 
1706 			p = realloc(dst, n + nb);
1707 			if (p == NULL) {
1708 				free(dst);
1709 				return got_error_from_errno("realloc");
1710 
1711 			}
1712 			dst = p;
1713 			n += nb;
1714 			memset(dst + sz, ' ', nb);
1715 			sz += nb;
1716 		} else
1717 			dst[sz++] = src[idx];
1718 		++idx;
1719 	}
1720 
1721 	dst[sz] = '\0';
1722 	*ptr = dst;
1723 	return NULL;
1724 }
1725 
1726 /*
1727  * Advance at most n columns from wline starting at offset off.
1728  * Return the index to the first character after the span operation.
1729  * Return the combined column width of all spanned wide character in
1730  * *rcol.
1731  */
1732 static int
1733 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1734 {
1735 	int width, i, cols = 0;
1736 
1737 	if (n == 0) {
1738 		*rcol = cols;
1739 		return off;
1740 	}
1741 
1742 	for (i = off; wline[i] != L'\0'; ++i) {
1743 		if (wline[i] == L'\t')
1744 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1745 		else
1746 			width = wcwidth(wline[i]);
1747 
1748 		if (width == -1) {
1749 			width = 1;
1750 			wline[i] = L'.';
1751 		}
1752 
1753 		if (cols + width > n)
1754 			break;
1755 		cols += width;
1756 	}
1757 
1758 	*rcol = cols;
1759 	return i;
1760 }
1761 
1762 /*
1763  * Format a line for display, ensuring that it won't overflow a width limit.
1764  * With scrolling, the width returned refers to the scrolled version of the
1765  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1766  */
1767 static const struct got_error *
1768 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1769     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1770 {
1771 	const struct got_error *err = NULL;
1772 	int cols;
1773 	wchar_t *wline = NULL;
1774 	char *exstr = NULL;
1775 	size_t wlen;
1776 	int i, scrollx;
1777 
1778 	*wlinep = NULL;
1779 	*widthp = 0;
1780 
1781 	if (expand) {
1782 		err = expand_tab(&exstr, line);
1783 		if (err)
1784 			return err;
1785 	}
1786 
1787 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1788 	free(exstr);
1789 	if (err)
1790 		return err;
1791 
1792 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1793 
1794 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1795 		wline[wlen - 1] = L'\0';
1796 		wlen--;
1797 	}
1798 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1799 		wline[wlen - 1] = L'\0';
1800 		wlen--;
1801 	}
1802 
1803 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1804 	wline[i] = L'\0';
1805 
1806 	if (widthp)
1807 		*widthp = cols;
1808 	if (scrollxp)
1809 		*scrollxp = scrollx;
1810 	if (err)
1811 		free(wline);
1812 	else
1813 		*wlinep = wline;
1814 	return err;
1815 }
1816 
1817 static const struct got_error*
1818 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1819     struct got_object_id *id, struct got_repository *repo)
1820 {
1821 	static const struct got_error *err = NULL;
1822 	struct got_reflist_entry *re;
1823 	char *s;
1824 	const char *name;
1825 
1826 	*refs_str = NULL;
1827 
1828 	TAILQ_FOREACH(re, refs, entry) {
1829 		struct got_tag_object *tag = NULL;
1830 		struct got_object_id *ref_id;
1831 		int cmp;
1832 
1833 		name = got_ref_get_name(re->ref);
1834 		if (strcmp(name, GOT_REF_HEAD) == 0)
1835 			continue;
1836 		if (strncmp(name, "refs/", 5) == 0)
1837 			name += 5;
1838 		if (strncmp(name, "got/", 4) == 0 &&
1839 		    strncmp(name, "got/backup/", 11) != 0)
1840 			continue;
1841 		if (strncmp(name, "heads/", 6) == 0)
1842 			name += 6;
1843 		if (strncmp(name, "remotes/", 8) == 0) {
1844 			name += 8;
1845 			s = strstr(name, "/" GOT_REF_HEAD);
1846 			if (s != NULL && s[strlen(s)] == '\0')
1847 				continue;
1848 		}
1849 		err = got_ref_resolve(&ref_id, repo, re->ref);
1850 		if (err)
1851 			break;
1852 		if (strncmp(name, "tags/", 5) == 0) {
1853 			err = got_object_open_as_tag(&tag, repo, ref_id);
1854 			if (err) {
1855 				if (err->code != GOT_ERR_OBJ_TYPE) {
1856 					free(ref_id);
1857 					break;
1858 				}
1859 				/* Ref points at something other than a tag. */
1860 				err = NULL;
1861 				tag = NULL;
1862 			}
1863 		}
1864 		cmp = got_object_id_cmp(tag ?
1865 		    got_object_tag_get_object_id(tag) : ref_id, id);
1866 		free(ref_id);
1867 		if (tag)
1868 			got_object_tag_close(tag);
1869 		if (cmp != 0)
1870 			continue;
1871 		s = *refs_str;
1872 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1873 		    s ? ", " : "", name) == -1) {
1874 			err = got_error_from_errno("asprintf");
1875 			free(s);
1876 			*refs_str = NULL;
1877 			break;
1878 		}
1879 		free(s);
1880 	}
1881 
1882 	return err;
1883 }
1884 
1885 static const struct got_error *
1886 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1887     int col_tab_align)
1888 {
1889 	char *smallerthan;
1890 
1891 	smallerthan = strchr(author, '<');
1892 	if (smallerthan && smallerthan[1] != '\0')
1893 		author = smallerthan + 1;
1894 	author[strcspn(author, "@>")] = '\0';
1895 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1896 	    col_tab_align, 0);
1897 }
1898 
1899 static const struct got_error *
1900 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1901     struct got_object_id *id, const size_t date_display_cols,
1902     int author_display_cols)
1903 {
1904 	struct tog_log_view_state *s = &view->state.log;
1905 	const struct got_error *err = NULL;
1906 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1907 	char *logmsg0 = NULL, *logmsg = NULL;
1908 	char *author = NULL;
1909 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1910 	int author_width, logmsg_width;
1911 	char *newline, *line = NULL;
1912 	int col, limit, scrollx;
1913 	const int avail = view->ncols;
1914 	struct tm tm;
1915 	time_t committer_time;
1916 	struct tog_color *tc;
1917 
1918 	committer_time = got_object_commit_get_committer_time(commit);
1919 	if (gmtime_r(&committer_time, &tm) == NULL)
1920 		return got_error_from_errno("gmtime_r");
1921 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1922 		return got_error(GOT_ERR_NO_SPACE);
1923 
1924 	if (avail <= date_display_cols)
1925 		limit = MIN(sizeof(datebuf) - 1, avail);
1926 	else
1927 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1928 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1929 	if (tc)
1930 		wattr_on(view->window,
1931 		    COLOR_PAIR(tc->colorpair), NULL);
1932 	waddnstr(view->window, datebuf, limit);
1933 	if (tc)
1934 		wattr_off(view->window,
1935 		    COLOR_PAIR(tc->colorpair), NULL);
1936 	col = limit;
1937 	if (col > avail)
1938 		goto done;
1939 
1940 	if (avail >= 120) {
1941 		char *id_str;
1942 		err = got_object_id_str(&id_str, id);
1943 		if (err)
1944 			goto done;
1945 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1946 		if (tc)
1947 			wattr_on(view->window,
1948 			    COLOR_PAIR(tc->colorpair), NULL);
1949 		wprintw(view->window, "%.8s ", id_str);
1950 		if (tc)
1951 			wattr_off(view->window,
1952 			    COLOR_PAIR(tc->colorpair), NULL);
1953 		free(id_str);
1954 		col += 9;
1955 		if (col > avail)
1956 			goto done;
1957 	}
1958 
1959 	author = strdup(got_object_commit_get_author(commit));
1960 	if (author == NULL) {
1961 		err = got_error_from_errno("strdup");
1962 		goto done;
1963 	}
1964 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1965 	if (err)
1966 		goto done;
1967 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1968 	if (tc)
1969 		wattr_on(view->window,
1970 		    COLOR_PAIR(tc->colorpair), NULL);
1971 	waddwstr(view->window, wauthor);
1972 	if (tc)
1973 		wattr_off(view->window,
1974 		    COLOR_PAIR(tc->colorpair), NULL);
1975 	col += author_width;
1976 	while (col < avail && author_width < author_display_cols + 2) {
1977 		waddch(view->window, ' ');
1978 		col++;
1979 		author_width++;
1980 	}
1981 	if (col > avail)
1982 		goto done;
1983 
1984 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1985 	if (err)
1986 		goto done;
1987 	logmsg = logmsg0;
1988 	while (*logmsg == '\n')
1989 		logmsg++;
1990 	newline = strchr(logmsg, '\n');
1991 	if (newline)
1992 		*newline = '\0';
1993 	limit = avail - col;
1994 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
1995 		limit--;	/* for the border */
1996 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
1997 	    limit, col, 1);
1998 	if (err)
1999 		goto done;
2000 	waddwstr(view->window, &wlogmsg[scrollx]);
2001 	col += MAX(logmsg_width, 0);
2002 	while (col < avail) {
2003 		waddch(view->window, ' ');
2004 		col++;
2005 	}
2006 done:
2007 	free(logmsg0);
2008 	free(wlogmsg);
2009 	free(author);
2010 	free(wauthor);
2011 	free(line);
2012 	return err;
2013 }
2014 
2015 static struct commit_queue_entry *
2016 alloc_commit_queue_entry(struct got_commit_object *commit,
2017     struct got_object_id *id)
2018 {
2019 	struct commit_queue_entry *entry;
2020 
2021 	entry = calloc(1, sizeof(*entry));
2022 	if (entry == NULL)
2023 		return NULL;
2024 
2025 	entry->id = id;
2026 	entry->commit = commit;
2027 	return entry;
2028 }
2029 
2030 static void
2031 pop_commit(struct commit_queue *commits)
2032 {
2033 	struct commit_queue_entry *entry;
2034 
2035 	entry = TAILQ_FIRST(&commits->head);
2036 	TAILQ_REMOVE(&commits->head, entry, entry);
2037 	got_object_commit_close(entry->commit);
2038 	commits->ncommits--;
2039 	/* Don't free entry->id! It is owned by the commit graph. */
2040 	free(entry);
2041 }
2042 
2043 static void
2044 free_commits(struct commit_queue *commits)
2045 {
2046 	while (!TAILQ_EMPTY(&commits->head))
2047 		pop_commit(commits);
2048 }
2049 
2050 static const struct got_error *
2051 match_commit(int *have_match, struct got_object_id *id,
2052     struct got_commit_object *commit, regex_t *regex)
2053 {
2054 	const struct got_error *err = NULL;
2055 	regmatch_t regmatch;
2056 	char *id_str = NULL, *logmsg = NULL;
2057 
2058 	*have_match = 0;
2059 
2060 	err = got_object_id_str(&id_str, id);
2061 	if (err)
2062 		return err;
2063 
2064 	err = got_object_commit_get_logmsg(&logmsg, commit);
2065 	if (err)
2066 		goto done;
2067 
2068 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2069 	    &regmatch, 0) == 0 ||
2070 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2071 	    &regmatch, 0) == 0 ||
2072 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2073 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2074 		*have_match = 1;
2075 done:
2076 	free(id_str);
2077 	free(logmsg);
2078 	return err;
2079 }
2080 
2081 static const struct got_error *
2082 queue_commits(struct tog_log_thread_args *a)
2083 {
2084 	const struct got_error *err = NULL;
2085 
2086 	/*
2087 	 * We keep all commits open throughout the lifetime of the log
2088 	 * view in order to avoid having to re-fetch commits from disk
2089 	 * while updating the display.
2090 	 */
2091 	do {
2092 		struct got_object_id *id;
2093 		struct got_commit_object *commit;
2094 		struct commit_queue_entry *entry;
2095 		int errcode;
2096 
2097 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2098 		    NULL, NULL);
2099 		if (err || id == NULL)
2100 			break;
2101 
2102 		err = got_object_open_as_commit(&commit, a->repo, id);
2103 		if (err)
2104 			break;
2105 		entry = alloc_commit_queue_entry(commit, id);
2106 		if (entry == NULL) {
2107 			err = got_error_from_errno("alloc_commit_queue_entry");
2108 			break;
2109 		}
2110 
2111 		errcode = pthread_mutex_lock(&tog_mutex);
2112 		if (errcode) {
2113 			err = got_error_set_errno(errcode,
2114 			    "pthread_mutex_lock");
2115 			break;
2116 		}
2117 
2118 		entry->idx = a->commits->ncommits;
2119 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2120 		a->commits->ncommits++;
2121 
2122 		if (*a->searching == TOG_SEARCH_FORWARD &&
2123 		    !*a->search_next_done) {
2124 			int have_match;
2125 			err = match_commit(&have_match, id, commit, a->regex);
2126 			if (err)
2127 				break;
2128 			if (have_match)
2129 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2130 		}
2131 
2132 		errcode = pthread_mutex_unlock(&tog_mutex);
2133 		if (errcode && err == NULL)
2134 			err = got_error_set_errno(errcode,
2135 			    "pthread_mutex_unlock");
2136 		if (err)
2137 			break;
2138 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2139 
2140 	return err;
2141 }
2142 
2143 static void
2144 select_commit(struct tog_log_view_state *s)
2145 {
2146 	struct commit_queue_entry *entry;
2147 	int ncommits = 0;
2148 
2149 	entry = s->first_displayed_entry;
2150 	while (entry) {
2151 		if (ncommits == s->selected) {
2152 			s->selected_entry = entry;
2153 			break;
2154 		}
2155 		entry = TAILQ_NEXT(entry, entry);
2156 		ncommits++;
2157 	}
2158 }
2159 
2160 static const struct got_error *
2161 draw_commits(struct tog_view *view)
2162 {
2163 	const struct got_error *err = NULL;
2164 	struct tog_log_view_state *s = &view->state.log;
2165 	struct commit_queue_entry *entry = s->selected_entry;
2166 	const int limit = view->nlines;
2167 	int width;
2168 	int ncommits, author_cols = 4;
2169 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2170 	char *refs_str = NULL;
2171 	wchar_t *wline;
2172 	struct tog_color *tc;
2173 	static const size_t date_display_cols = 12;
2174 
2175 	if (s->selected_entry &&
2176 	    !(view->searching && view->search_next_done == 0)) {
2177 		struct got_reflist_head *refs;
2178 		err = got_object_id_str(&id_str, s->selected_entry->id);
2179 		if (err)
2180 			return err;
2181 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2182 		    s->selected_entry->id);
2183 		if (refs) {
2184 			err = build_refs_str(&refs_str, refs,
2185 			    s->selected_entry->id, s->repo);
2186 			if (err)
2187 				goto done;
2188 		}
2189 	}
2190 
2191 	if (s->thread_args.commits_needed == 0)
2192 		halfdelay(10); /* disable fast refresh */
2193 
2194 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2195 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2196 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2197 		    (view->searching && !view->search_next_done) ?
2198 		    "searching..." : "loading...") == -1) {
2199 			err = got_error_from_errno("asprintf");
2200 			goto done;
2201 		}
2202 	} else {
2203 		const char *search_str = NULL;
2204 
2205 		if (view->searching) {
2206 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2207 				search_str = "no more matches";
2208 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2209 				search_str = "no matches found";
2210 			else if (!view->search_next_done)
2211 				search_str = "searching...";
2212 		}
2213 
2214 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2215 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2216 		    search_str ? search_str :
2217 		    (refs_str ? refs_str : "")) == -1) {
2218 			err = got_error_from_errno("asprintf");
2219 			goto done;
2220 		}
2221 	}
2222 
2223 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2224 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2225 		    "........................................",
2226 		    s->in_repo_path, ncommits_str) == -1) {
2227 			err = got_error_from_errno("asprintf");
2228 			header = NULL;
2229 			goto done;
2230 		}
2231 	} else if (asprintf(&header, "commit %s%s",
2232 	    id_str ? id_str : "........................................",
2233 	    ncommits_str) == -1) {
2234 		err = got_error_from_errno("asprintf");
2235 		header = NULL;
2236 		goto done;
2237 	}
2238 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2239 	if (err)
2240 		goto done;
2241 
2242 	werase(view->window);
2243 
2244 	if (view_needs_focus_indication(view))
2245 		wstandout(view->window);
2246 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2247 	if (tc)
2248 		wattr_on(view->window,
2249 		    COLOR_PAIR(tc->colorpair), NULL);
2250 	waddwstr(view->window, wline);
2251 	if (tc)
2252 		wattr_off(view->window,
2253 		    COLOR_PAIR(tc->colorpair), NULL);
2254 	while (width < view->ncols) {
2255 		waddch(view->window, ' ');
2256 		width++;
2257 	}
2258 	if (view_needs_focus_indication(view))
2259 		wstandend(view->window);
2260 	free(wline);
2261 	if (limit <= 1)
2262 		goto done;
2263 
2264 	/* Grow author column size if necessary, and set view->maxx. */
2265 	entry = s->first_displayed_entry;
2266 	ncommits = 0;
2267 	view->maxx = 0;
2268 	while (entry) {
2269 		char *author, *eol, *msg, *msg0;
2270 		wchar_t *wauthor, *wmsg;
2271 		int width;
2272 		if (ncommits >= limit - 1)
2273 			break;
2274 		author = strdup(got_object_commit_get_author(entry->commit));
2275 		if (author == NULL) {
2276 			err = got_error_from_errno("strdup");
2277 			goto done;
2278 		}
2279 		err = format_author(&wauthor, &width, author, COLS,
2280 		    date_display_cols);
2281 		if (author_cols < width)
2282 			author_cols = width;
2283 		free(wauthor);
2284 		free(author);
2285 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
2286 		if (err)
2287 			goto done;
2288 		msg = msg0;
2289 		while (*msg == '\n')
2290 			++msg;
2291 		if ((eol = strchr(msg, '\n')))
2292 			*eol = '\0';
2293 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2294 		    date_display_cols + author_cols, 0);
2295 		if (err)
2296 			goto done;
2297 		view->maxx = MAX(view->maxx, width);
2298 		free(msg0);
2299 		free(wmsg);
2300 		ncommits++;
2301 		entry = TAILQ_NEXT(entry, entry);
2302 	}
2303 
2304 	entry = s->first_displayed_entry;
2305 	s->last_displayed_entry = s->first_displayed_entry;
2306 	ncommits = 0;
2307 	while (entry) {
2308 		if (ncommits >= limit - 1)
2309 			break;
2310 		if (ncommits == s->selected)
2311 			wstandout(view->window);
2312 		err = draw_commit(view, entry->commit, entry->id,
2313 		    date_display_cols, author_cols);
2314 		if (ncommits == s->selected)
2315 			wstandend(view->window);
2316 		if (err)
2317 			goto done;
2318 		ncommits++;
2319 		s->last_displayed_entry = entry;
2320 		entry = TAILQ_NEXT(entry, entry);
2321 	}
2322 
2323 	view_border(view);
2324 done:
2325 	free(id_str);
2326 	free(refs_str);
2327 	free(ncommits_str);
2328 	free(header);
2329 	return err;
2330 }
2331 
2332 static void
2333 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2334 {
2335 	struct commit_queue_entry *entry;
2336 	int nscrolled = 0;
2337 
2338 	entry = TAILQ_FIRST(&s->commits.head);
2339 	if (s->first_displayed_entry == entry)
2340 		return;
2341 
2342 	entry = s->first_displayed_entry;
2343 	while (entry && nscrolled < maxscroll) {
2344 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2345 		if (entry) {
2346 			s->first_displayed_entry = entry;
2347 			nscrolled++;
2348 		}
2349 	}
2350 }
2351 
2352 static const struct got_error *
2353 trigger_log_thread(struct tog_view *view, int wait)
2354 {
2355 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2356 	int errcode;
2357 
2358 	halfdelay(1); /* fast refresh while loading commits */
2359 
2360 	while (!ta->log_complete && !tog_thread_error &&
2361 	    (ta->commits_needed > 0 || ta->load_all)) {
2362 		/* Wake the log thread. */
2363 		errcode = pthread_cond_signal(&ta->need_commits);
2364 		if (errcode)
2365 			return got_error_set_errno(errcode,
2366 			    "pthread_cond_signal");
2367 
2368 		/*
2369 		 * The mutex will be released while the view loop waits
2370 		 * in wgetch(), at which time the log thread will run.
2371 		 */
2372 		if (!wait)
2373 			break;
2374 
2375 		/* Display progress update in log view. */
2376 		show_log_view(view);
2377 		update_panels();
2378 		doupdate();
2379 
2380 		/* Wait right here while next commit is being loaded. */
2381 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2382 		if (errcode)
2383 			return got_error_set_errno(errcode,
2384 			    "pthread_cond_wait");
2385 
2386 		/* Display progress update in log view. */
2387 		show_log_view(view);
2388 		update_panels();
2389 		doupdate();
2390 	}
2391 
2392 	return NULL;
2393 }
2394 
2395 static const struct got_error *
2396 request_log_commits(struct tog_view *view)
2397 {
2398 	struct tog_log_view_state	*state = &view->state.log;
2399 	const struct got_error		*err = NULL;
2400 
2401 	state->thread_args.commits_needed = view->nscrolled;
2402 	err = trigger_log_thread(view, 1);
2403 	view->nscrolled = 0;
2404 
2405 	return err;
2406 }
2407 
2408 static const struct got_error *
2409 log_scroll_down(struct tog_view *view, int maxscroll)
2410 {
2411 	struct tog_log_view_state *s = &view->state.log;
2412 	const struct got_error *err = NULL;
2413 	struct commit_queue_entry *pentry;
2414 	int nscrolled = 0, ncommits_needed;
2415 
2416 	if (s->last_displayed_entry == NULL)
2417 		return NULL;
2418 
2419 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2420 	if (s->commits.ncommits < ncommits_needed &&
2421 	    !s->thread_args.log_complete) {
2422 		/*
2423 		 * Ask the log thread for required amount of commits.
2424 		 */
2425 		s->thread_args.commits_needed += maxscroll;
2426 		err = trigger_log_thread(view, 1);
2427 		if (err)
2428 			return err;
2429 	}
2430 
2431 	do {
2432 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2433 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2434 			break;
2435 
2436 		s->last_displayed_entry = pentry ?
2437 		    pentry : s->last_displayed_entry;;
2438 
2439 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2440 		if (pentry == NULL)
2441 			break;
2442 		s->first_displayed_entry = pentry;
2443 	} while (++nscrolled < maxscroll);
2444 
2445 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
2446 		view->nscrolled += nscrolled;
2447 	else
2448 		view->nscrolled = 0;
2449 
2450 	return err;
2451 }
2452 
2453 static const struct got_error *
2454 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2455     struct got_commit_object *commit, struct got_object_id *commit_id,
2456     struct tog_view *log_view, struct got_repository *repo)
2457 {
2458 	const struct got_error *err;
2459 	struct got_object_qid *parent_id;
2460 	struct tog_view *diff_view;
2461 
2462 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2463 	if (diff_view == NULL)
2464 		return got_error_from_errno("view_open");
2465 
2466 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2467 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2468 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2469 	if (err == NULL)
2470 		*new_view = diff_view;
2471 	return err;
2472 }
2473 
2474 static const struct got_error *
2475 tree_view_visit_subtree(struct tog_tree_view_state *s,
2476     struct got_tree_object *subtree)
2477 {
2478 	struct tog_parent_tree *parent;
2479 
2480 	parent = calloc(1, sizeof(*parent));
2481 	if (parent == NULL)
2482 		return got_error_from_errno("calloc");
2483 
2484 	parent->tree = s->tree;
2485 	parent->first_displayed_entry = s->first_displayed_entry;
2486 	parent->selected_entry = s->selected_entry;
2487 	parent->selected = s->selected;
2488 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2489 	s->tree = subtree;
2490 	s->selected = 0;
2491 	s->first_displayed_entry = NULL;
2492 	return NULL;
2493 }
2494 
2495 static const struct got_error *
2496 tree_view_walk_path(struct tog_tree_view_state *s,
2497     struct got_commit_object *commit, const char *path)
2498 {
2499 	const struct got_error *err = NULL;
2500 	struct got_tree_object *tree = NULL;
2501 	const char *p;
2502 	char *slash, *subpath = NULL;
2503 
2504 	/* Walk the path and open corresponding tree objects. */
2505 	p = path;
2506 	while (*p) {
2507 		struct got_tree_entry *te;
2508 		struct got_object_id *tree_id;
2509 		char *te_name;
2510 
2511 		while (p[0] == '/')
2512 			p++;
2513 
2514 		/* Ensure the correct subtree entry is selected. */
2515 		slash = strchr(p, '/');
2516 		if (slash == NULL)
2517 			te_name = strdup(p);
2518 		else
2519 			te_name = strndup(p, slash - p);
2520 		if (te_name == NULL) {
2521 			err = got_error_from_errno("strndup");
2522 			break;
2523 		}
2524 		te = got_object_tree_find_entry(s->tree, te_name);
2525 		if (te == NULL) {
2526 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2527 			free(te_name);
2528 			break;
2529 		}
2530 		free(te_name);
2531 		s->first_displayed_entry = s->selected_entry = te;
2532 
2533 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2534 			break; /* jump to this file's entry */
2535 
2536 		slash = strchr(p, '/');
2537 		if (slash)
2538 			subpath = strndup(path, slash - path);
2539 		else
2540 			subpath = strdup(path);
2541 		if (subpath == NULL) {
2542 			err = got_error_from_errno("strdup");
2543 			break;
2544 		}
2545 
2546 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2547 		    subpath);
2548 		if (err)
2549 			break;
2550 
2551 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2552 		free(tree_id);
2553 		if (err)
2554 			break;
2555 
2556 		err = tree_view_visit_subtree(s, tree);
2557 		if (err) {
2558 			got_object_tree_close(tree);
2559 			break;
2560 		}
2561 		if (slash == NULL)
2562 			break;
2563 		free(subpath);
2564 		subpath = NULL;
2565 		p = slash;
2566 	}
2567 
2568 	free(subpath);
2569 	return err;
2570 }
2571 
2572 static const struct got_error *
2573 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2574     struct commit_queue_entry *entry, const char *path,
2575     const char *head_ref_name, struct got_repository *repo)
2576 {
2577 	const struct got_error *err = NULL;
2578 	struct tog_tree_view_state *s;
2579 	struct tog_view *tree_view;
2580 
2581 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2582 	if (tree_view == NULL)
2583 		return got_error_from_errno("view_open");
2584 
2585 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2586 	if (err)
2587 		return err;
2588 	s = &tree_view->state.tree;
2589 
2590 	*new_view = tree_view;
2591 
2592 	if (got_path_is_root_dir(path))
2593 		return NULL;
2594 
2595 	return tree_view_walk_path(s, entry->commit, path);
2596 }
2597 
2598 static const struct got_error *
2599 block_signals_used_by_main_thread(void)
2600 {
2601 	sigset_t sigset;
2602 	int errcode;
2603 
2604 	if (sigemptyset(&sigset) == -1)
2605 		return got_error_from_errno("sigemptyset");
2606 
2607 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2608 	if (sigaddset(&sigset, SIGWINCH) == -1)
2609 		return got_error_from_errno("sigaddset");
2610 	if (sigaddset(&sigset, SIGCONT) == -1)
2611 		return got_error_from_errno("sigaddset");
2612 	if (sigaddset(&sigset, SIGINT) == -1)
2613 		return got_error_from_errno("sigaddset");
2614 	if (sigaddset(&sigset, SIGTERM) == -1)
2615 		return got_error_from_errno("sigaddset");
2616 
2617 	/* ncurses handles SIGTSTP */
2618 	if (sigaddset(&sigset, SIGTSTP) == -1)
2619 		return got_error_from_errno("sigaddset");
2620 
2621 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2622 	if (errcode)
2623 		return got_error_set_errno(errcode, "pthread_sigmask");
2624 
2625 	return NULL;
2626 }
2627 
2628 static void *
2629 log_thread(void *arg)
2630 {
2631 	const struct got_error *err = NULL;
2632 	int errcode = 0;
2633 	struct tog_log_thread_args *a = arg;
2634 	int done = 0;
2635 
2636 	/*
2637 	 * Sync startup with main thread such that we begin our
2638 	 * work once view_input() has released the mutex.
2639 	 */
2640 	errcode = pthread_mutex_lock(&tog_mutex);
2641 	if (errcode) {
2642 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2643 		return (void *)err;
2644 	}
2645 
2646 	err = block_signals_used_by_main_thread();
2647 	if (err) {
2648 		pthread_mutex_unlock(&tog_mutex);
2649 		goto done;
2650 	}
2651 
2652 	while (!done && !err && !tog_fatal_signal_received()) {
2653 		errcode = pthread_mutex_unlock(&tog_mutex);
2654 		if (errcode) {
2655 			err = got_error_set_errno(errcode,
2656 			    "pthread_mutex_unlock");
2657 			goto done;
2658 		}
2659 		err = queue_commits(a);
2660 		if (err) {
2661 			if (err->code != GOT_ERR_ITER_COMPLETED)
2662 				goto done;
2663 			err = NULL;
2664 			done = 1;
2665 		} else if (a->commits_needed > 0 && !a->load_all)
2666 			a->commits_needed--;
2667 
2668 		errcode = pthread_mutex_lock(&tog_mutex);
2669 		if (errcode) {
2670 			err = got_error_set_errno(errcode,
2671 			    "pthread_mutex_lock");
2672 			goto done;
2673 		} else if (*a->quit)
2674 			done = 1;
2675 		else if (*a->first_displayed_entry == NULL) {
2676 			*a->first_displayed_entry =
2677 			    TAILQ_FIRST(&a->commits->head);
2678 			*a->selected_entry = *a->first_displayed_entry;
2679 		}
2680 
2681 		errcode = pthread_cond_signal(&a->commit_loaded);
2682 		if (errcode) {
2683 			err = got_error_set_errno(errcode,
2684 			    "pthread_cond_signal");
2685 			pthread_mutex_unlock(&tog_mutex);
2686 			goto done;
2687 		}
2688 
2689 		if (done)
2690 			a->commits_needed = 0;
2691 		else {
2692 			if (a->commits_needed == 0 && !a->load_all) {
2693 				errcode = pthread_cond_wait(&a->need_commits,
2694 				    &tog_mutex);
2695 				if (errcode) {
2696 					err = got_error_set_errno(errcode,
2697 					    "pthread_cond_wait");
2698 					pthread_mutex_unlock(&tog_mutex);
2699 					goto done;
2700 				}
2701 				if (*a->quit)
2702 					done = 1;
2703 			}
2704 		}
2705 	}
2706 	a->log_complete = 1;
2707 	errcode = pthread_mutex_unlock(&tog_mutex);
2708 	if (errcode)
2709 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2710 done:
2711 	if (err) {
2712 		tog_thread_error = 1;
2713 		pthread_cond_signal(&a->commit_loaded);
2714 	}
2715 	return (void *)err;
2716 }
2717 
2718 static const struct got_error *
2719 stop_log_thread(struct tog_log_view_state *s)
2720 {
2721 	const struct got_error *err = NULL, *thread_err = NULL;
2722 	int errcode;
2723 
2724 	if (s->thread) {
2725 		s->quit = 1;
2726 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2727 		if (errcode)
2728 			return got_error_set_errno(errcode,
2729 			    "pthread_cond_signal");
2730 		errcode = pthread_mutex_unlock(&tog_mutex);
2731 		if (errcode)
2732 			return got_error_set_errno(errcode,
2733 			    "pthread_mutex_unlock");
2734 		errcode = pthread_join(s->thread, (void **)&thread_err);
2735 		if (errcode)
2736 			return got_error_set_errno(errcode, "pthread_join");
2737 		errcode = pthread_mutex_lock(&tog_mutex);
2738 		if (errcode)
2739 			return got_error_set_errno(errcode,
2740 			    "pthread_mutex_lock");
2741 		s->thread = NULL;
2742 	}
2743 
2744 	if (s->thread_args.repo) {
2745 		err = got_repo_close(s->thread_args.repo);
2746 		s->thread_args.repo = NULL;
2747 	}
2748 
2749 	if (s->thread_args.pack_fds) {
2750 		const struct got_error *pack_err =
2751 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2752 		if (err == NULL)
2753 			err = pack_err;
2754 		s->thread_args.pack_fds = NULL;
2755 	}
2756 
2757 	if (s->thread_args.graph) {
2758 		got_commit_graph_close(s->thread_args.graph);
2759 		s->thread_args.graph = NULL;
2760 	}
2761 
2762 	return err ? err : thread_err;
2763 }
2764 
2765 static const struct got_error *
2766 close_log_view(struct tog_view *view)
2767 {
2768 	const struct got_error *err = NULL;
2769 	struct tog_log_view_state *s = &view->state.log;
2770 	int errcode;
2771 
2772 	err = stop_log_thread(s);
2773 
2774 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2775 	if (errcode && err == NULL)
2776 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2777 
2778 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2779 	if (errcode && err == NULL)
2780 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2781 
2782 	free_commits(&s->commits);
2783 	free(s->in_repo_path);
2784 	s->in_repo_path = NULL;
2785 	free(s->start_id);
2786 	s->start_id = NULL;
2787 	free(s->head_ref_name);
2788 	s->head_ref_name = NULL;
2789 	return err;
2790 }
2791 
2792 static const struct got_error *
2793 search_start_log_view(struct tog_view *view)
2794 {
2795 	struct tog_log_view_state *s = &view->state.log;
2796 
2797 	s->matched_entry = NULL;
2798 	s->search_entry = NULL;
2799 	return NULL;
2800 }
2801 
2802 static const struct got_error *
2803 search_next_log_view(struct tog_view *view)
2804 {
2805 	const struct got_error *err = NULL;
2806 	struct tog_log_view_state *s = &view->state.log;
2807 	struct commit_queue_entry *entry;
2808 
2809 	/* Display progress update in log view. */
2810 	show_log_view(view);
2811 	update_panels();
2812 	doupdate();
2813 
2814 	if (s->search_entry) {
2815 		int errcode, ch;
2816 		errcode = pthread_mutex_unlock(&tog_mutex);
2817 		if (errcode)
2818 			return got_error_set_errno(errcode,
2819 			    "pthread_mutex_unlock");
2820 		ch = wgetch(view->window);
2821 		errcode = pthread_mutex_lock(&tog_mutex);
2822 		if (errcode)
2823 			return got_error_set_errno(errcode,
2824 			    "pthread_mutex_lock");
2825 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2826 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2827 			return NULL;
2828 		}
2829 		if (view->searching == TOG_SEARCH_FORWARD)
2830 			entry = TAILQ_NEXT(s->search_entry, entry);
2831 		else
2832 			entry = TAILQ_PREV(s->search_entry,
2833 			    commit_queue_head, entry);
2834 	} else if (s->matched_entry) {
2835 		int matched_idx = s->matched_entry->idx;
2836 		int selected_idx = s->selected_entry->idx;
2837 
2838 		/*
2839 		 * If the user has moved the cursor after we hit a match,
2840 		 * the position from where we should continue searching
2841 		 * might have changed.
2842 		 */
2843 		if (view->searching == TOG_SEARCH_FORWARD) {
2844 			if (matched_idx > selected_idx)
2845 				entry = TAILQ_NEXT(s->selected_entry, entry);
2846 			else
2847 				entry = TAILQ_NEXT(s->matched_entry, entry);
2848 		} else {
2849 			if (matched_idx < selected_idx)
2850 				entry = TAILQ_PREV(s->selected_entry,
2851 						commit_queue_head, entry);
2852 			else
2853 				entry = TAILQ_PREV(s->matched_entry,
2854 						commit_queue_head, entry);
2855 		}
2856 	} else {
2857 		entry = s->selected_entry;
2858 	}
2859 
2860 	while (1) {
2861 		int have_match = 0;
2862 
2863 		if (entry == NULL) {
2864 			if (s->thread_args.log_complete ||
2865 			    view->searching == TOG_SEARCH_BACKWARD) {
2866 				view->search_next_done =
2867 				    (s->matched_entry == NULL ?
2868 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2869 				s->search_entry = NULL;
2870 				return NULL;
2871 			}
2872 			/*
2873 			 * Poke the log thread for more commits and return,
2874 			 * allowing the main loop to make progress. Search
2875 			 * will resume at s->search_entry once we come back.
2876 			 */
2877 			s->thread_args.commits_needed++;
2878 			return trigger_log_thread(view, 0);
2879 		}
2880 
2881 		err = match_commit(&have_match, entry->id, entry->commit,
2882 		    &view->regex);
2883 		if (err)
2884 			break;
2885 		if (have_match) {
2886 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2887 			s->matched_entry = entry;
2888 			break;
2889 		}
2890 
2891 		s->search_entry = entry;
2892 		if (view->searching == TOG_SEARCH_FORWARD)
2893 			entry = TAILQ_NEXT(entry, entry);
2894 		else
2895 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2896 	}
2897 
2898 	if (s->matched_entry) {
2899 		int cur = s->selected_entry->idx;
2900 		while (cur < s->matched_entry->idx) {
2901 			err = input_log_view(NULL, view, KEY_DOWN);
2902 			if (err)
2903 				return err;
2904 			cur++;
2905 		}
2906 		while (cur > s->matched_entry->idx) {
2907 			err = input_log_view(NULL, view, KEY_UP);
2908 			if (err)
2909 				return err;
2910 			cur--;
2911 		}
2912 	}
2913 
2914 	s->search_entry = NULL;
2915 
2916 	return NULL;
2917 }
2918 
2919 static const struct got_error *
2920 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2921     struct got_repository *repo, const char *head_ref_name,
2922     const char *in_repo_path, int log_branches)
2923 {
2924 	const struct got_error *err = NULL;
2925 	struct tog_log_view_state *s = &view->state.log;
2926 	struct got_repository *thread_repo = NULL;
2927 	struct got_commit_graph *thread_graph = NULL;
2928 	int errcode;
2929 
2930 	if (in_repo_path != s->in_repo_path) {
2931 		free(s->in_repo_path);
2932 		s->in_repo_path = strdup(in_repo_path);
2933 		if (s->in_repo_path == NULL)
2934 			return got_error_from_errno("strdup");
2935 	}
2936 
2937 	/* The commit queue only contains commits being displayed. */
2938 	TAILQ_INIT(&s->commits.head);
2939 	s->commits.ncommits = 0;
2940 
2941 	s->repo = repo;
2942 	if (head_ref_name) {
2943 		s->head_ref_name = strdup(head_ref_name);
2944 		if (s->head_ref_name == NULL) {
2945 			err = got_error_from_errno("strdup");
2946 			goto done;
2947 		}
2948 	}
2949 	s->start_id = got_object_id_dup(start_id);
2950 	if (s->start_id == NULL) {
2951 		err = got_error_from_errno("got_object_id_dup");
2952 		goto done;
2953 	}
2954 	s->log_branches = log_branches;
2955 
2956 	STAILQ_INIT(&s->colors);
2957 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2958 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2959 		    get_color_value("TOG_COLOR_COMMIT"));
2960 		if (err)
2961 			goto done;
2962 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2963 		    get_color_value("TOG_COLOR_AUTHOR"));
2964 		if (err) {
2965 			free_colors(&s->colors);
2966 			goto done;
2967 		}
2968 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2969 		    get_color_value("TOG_COLOR_DATE"));
2970 		if (err) {
2971 			free_colors(&s->colors);
2972 			goto done;
2973 		}
2974 	}
2975 
2976 	view->show = show_log_view;
2977 	view->input = input_log_view;
2978 	view->close = close_log_view;
2979 	view->search_start = search_start_log_view;
2980 	view->search_next = search_next_log_view;
2981 
2982 	if (s->thread_args.pack_fds == NULL) {
2983 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2984 		if (err)
2985 			goto done;
2986 	}
2987 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
2988 	    s->thread_args.pack_fds);
2989 	if (err)
2990 		goto done;
2991 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
2992 	    !s->log_branches);
2993 	if (err)
2994 		goto done;
2995 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
2996 	    s->repo, NULL, NULL);
2997 	if (err)
2998 		goto done;
2999 
3000 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3001 	if (errcode) {
3002 		err = got_error_set_errno(errcode, "pthread_cond_init");
3003 		goto done;
3004 	}
3005 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3006 	if (errcode) {
3007 		err = got_error_set_errno(errcode, "pthread_cond_init");
3008 		goto done;
3009 	}
3010 
3011 	s->thread_args.commits_needed = view->nlines;
3012 	s->thread_args.graph = thread_graph;
3013 	s->thread_args.commits = &s->commits;
3014 	s->thread_args.in_repo_path = s->in_repo_path;
3015 	s->thread_args.start_id = s->start_id;
3016 	s->thread_args.repo = thread_repo;
3017 	s->thread_args.log_complete = 0;
3018 	s->thread_args.quit = &s->quit;
3019 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3020 	s->thread_args.selected_entry = &s->selected_entry;
3021 	s->thread_args.searching = &view->searching;
3022 	s->thread_args.search_next_done = &view->search_next_done;
3023 	s->thread_args.regex = &view->regex;
3024 done:
3025 	if (err)
3026 		close_log_view(view);
3027 	return err;
3028 }
3029 
3030 static const struct got_error *
3031 show_log_view(struct tog_view *view)
3032 {
3033 	const struct got_error *err;
3034 	struct tog_log_view_state *s = &view->state.log;
3035 
3036 	if (s->thread == NULL) {
3037 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3038 		    &s->thread_args);
3039 		if (errcode)
3040 			return got_error_set_errno(errcode, "pthread_create");
3041 		if (s->thread_args.commits_needed > 0) {
3042 			err = trigger_log_thread(view, 1);
3043 			if (err)
3044 				return err;
3045 		}
3046 	}
3047 
3048 	return draw_commits(view);
3049 }
3050 
3051 static void
3052 log_move_cursor_up(struct tog_view *view, int page, int home)
3053 {
3054 	struct tog_log_view_state *s = &view->state.log;
3055 
3056 	if (s->selected_entry->idx == 0)
3057 		view->count = 0;
3058 	if (s->first_displayed_entry == NULL)
3059 		return;
3060 
3061 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3062 	    || home)
3063 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3064 
3065 	if (!page && !home && s->selected > 0)
3066 		--s->selected;
3067 	else
3068 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3069 
3070 	select_commit(s);
3071 	return;
3072 }
3073 
3074 static const struct got_error *
3075 log_move_cursor_down(struct tog_view *view, int page)
3076 {
3077 	struct tog_log_view_state	*s = &view->state.log;
3078 	struct commit_queue_entry	*first;
3079 	const struct got_error		*err = NULL;
3080 
3081 	first = s->first_displayed_entry;
3082 	if (first == NULL) {
3083 		view->count = 0;
3084 		return NULL;
3085 	}
3086 
3087 	if (s->thread_args.log_complete &&
3088 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3089 		return NULL;
3090 
3091 	if (!page) {
3092 		int eos = view->nlines - 2;
3093 
3094 		if (view_is_hsplit_top(view))
3095 			--eos;  /* border consumes the last line */
3096 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3097 			++s->selected;
3098 		else
3099 			err = log_scroll_down(view, 1);
3100 	} else if (s->thread_args.load_all) {
3101 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3102 			s->selected += MIN(s->last_displayed_entry->idx -
3103 			    s->selected_entry->idx, page + 1);
3104 		else
3105 			err = log_scroll_down(view, MIN(page,
3106 			    s->commits.ncommits - s->selected_entry->idx - 1));
3107 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3108 	} else {
3109 		err = log_scroll_down(view, page);
3110 		if (err)
3111 			return err;
3112 		if (first == s->first_displayed_entry && s->selected <
3113 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3114 			s->selected = MIN(s->commits.ncommits - 1, page);
3115 		}
3116 	}
3117 	if (err)
3118 		return err;
3119 
3120 	/*
3121 	 * We might necessarily overshoot in horizontal
3122 	 * splits; if so, select the last displayed commit.
3123 	 */
3124 	s->selected = MIN(s->selected,
3125 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3126 
3127 	select_commit(s);
3128 
3129 	if (s->thread_args.log_complete &&
3130 	    s->selected_entry->idx == s->commits.ncommits - 1)
3131 		view->count = 0;
3132 
3133 	return NULL;
3134 }
3135 
3136 static void
3137 view_get_split(struct tog_view *view, int *y, int *x)
3138 {
3139 	*x = 0;
3140 	*y = 0;
3141 
3142 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3143 		if (view->child && view->child->resized_y)
3144 			*y = view->child->resized_y;
3145 		else if (view->resized_y)
3146 			*y = view->resized_y;
3147 		else
3148 			*y = view_split_begin_y(view->lines);
3149 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3150 		if (view->child && view->child->resized_x)
3151 			*x = view->child->resized_x;
3152 		else if (view->resized_x)
3153 			*x = view->resized_x;
3154 		else
3155 			*x = view_split_begin_x(view->begin_x);
3156 	}
3157 }
3158 
3159 /* Split view horizontally at y and offset view->state->selected line. */
3160 static const struct got_error *
3161 view_init_hsplit(struct tog_view *view, int y)
3162 {
3163 	const struct got_error *err = NULL;
3164 
3165 	view->nlines = y;
3166 	view->ncols = COLS;
3167 	err = view_resize(view);
3168 	if (err)
3169 		return err;
3170 
3171 	err = offset_selection_down(view);
3172 
3173 	return err;
3174 }
3175 
3176 static const struct got_error *
3177 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3178 {
3179 	const struct got_error *err = NULL;
3180 	struct tog_log_view_state *s = &view->state.log;
3181 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3182 	struct tog_view *ref_view = NULL;
3183 	struct commit_queue_entry *entry;
3184 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3185 
3186 	if (s->thread_args.load_all) {
3187 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3188 			s->thread_args.load_all = 0;
3189 		else if (s->thread_args.log_complete) {
3190 			err = log_move_cursor_down(view, s->commits.ncommits);
3191 			s->thread_args.load_all = 0;
3192 		}
3193 		return err;
3194 	}
3195 
3196 	eos = nscroll = view->nlines - 1;
3197 	if (view_is_hsplit_top(view))
3198 		--eos;  /* border */
3199 
3200 	switch (ch) {
3201 	case 'q':
3202 		s->quit = 1;
3203 		break;
3204 	case '0':
3205 		view->x = 0;
3206 		break;
3207 	case '$':
3208 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3209 		view->count = 0;
3210 		break;
3211 	case KEY_RIGHT:
3212 	case 'l':
3213 		if (view->x + view->ncols / 2 < view->maxx)
3214 			view->x += 2;  /* move two columns right */
3215 		else
3216 			view->count = 0;
3217 		break;
3218 	case KEY_LEFT:
3219 	case 'h':
3220 		view->x -= MIN(view->x, 2);  /* move two columns back */
3221 		if (view->x <= 0)
3222 			view->count = 0;
3223 		break;
3224 	case 'k':
3225 	case KEY_UP:
3226 	case '<':
3227 	case ',':
3228 	case CTRL('p'):
3229 		log_move_cursor_up(view, 0, 0);
3230 		break;
3231 	case 'g':
3232 	case KEY_HOME:
3233 		log_move_cursor_up(view, 0, 1);
3234 		view->count = 0;
3235 		break;
3236 	case CTRL('u'):
3237 	case 'u':
3238 		nscroll /= 2;
3239 		/* FALL THROUGH */
3240 	case KEY_PPAGE:
3241 	case CTRL('b'):
3242 	case 'b':
3243 		log_move_cursor_up(view, nscroll, 0);
3244 		break;
3245 	case 'j':
3246 	case KEY_DOWN:
3247 	case '>':
3248 	case '.':
3249 	case CTRL('n'):
3250 		err = log_move_cursor_down(view, 0);
3251 		break;
3252 	case 'G':
3253 	case KEY_END: {
3254 		/* We don't know yet how many commits, so we're forced to
3255 		 * traverse them all. */
3256 		view->count = 0;
3257 		if (!s->thread_args.log_complete) {
3258 			s->thread_args.load_all = 1;
3259 			return trigger_log_thread(view, 0);
3260 		}
3261 
3262 		s->selected = 0;
3263 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3264 		for (n = 0; n < eos; n++) {
3265 			if (entry == NULL)
3266 				break;
3267 			s->first_displayed_entry = entry;
3268 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3269 		}
3270 		if (n > 0)
3271 			s->selected = n - 1;
3272 		select_commit(s);
3273 		break;
3274 	}
3275 	case CTRL('d'):
3276 	case 'd':
3277 		nscroll /= 2;
3278 		/* FALL THROUGH */
3279 	case KEY_NPAGE:
3280 	case CTRL('f'):
3281 	case 'f':
3282 	case ' ':
3283 		err = log_move_cursor_down(view, nscroll);
3284 		break;
3285 	case KEY_RESIZE:
3286 		if (s->selected > view->nlines - 2)
3287 			s->selected = view->nlines - 2;
3288 		if (s->selected > s->commits.ncommits - 1)
3289 			s->selected = s->commits.ncommits - 1;
3290 		select_commit(s);
3291 		if (s->commits.ncommits < view->nlines - 1 &&
3292 		    !s->thread_args.log_complete) {
3293 			s->thread_args.commits_needed += (view->nlines - 1) -
3294 			    s->commits.ncommits;
3295 			err = trigger_log_thread(view, 1);
3296 		}
3297 		break;
3298 	case KEY_ENTER:
3299 	case '\r':
3300 		view->count = 0;
3301 		if (s->selected_entry == NULL)
3302 			break;
3303 
3304 		/* get dimensions--don't split till initialisation succeeds */
3305 		if (view_is_parent_view(view))
3306 			view_get_split(view, &begin_y, &begin_x);
3307 
3308 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3309 		    s->selected_entry->commit, s->selected_entry->id,
3310 		    view, s->repo);
3311 		if (err)
3312 			break;
3313 
3314 		if (view_is_parent_view(view) &&
3315 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3316 			err = view_init_hsplit(view, begin_y);
3317 			if (err)
3318 				break;
3319 		}
3320 
3321 		view->focussed = 0;
3322 		diff_view->focussed = 1;
3323 		diff_view->mode = view->mode;
3324 		diff_view->nlines = view->lines - begin_y;
3325 
3326 		if (view_is_parent_view(view)) {
3327 			view_transfer_size(diff_view, view);
3328 			err = view_close_child(view);
3329 			if (err)
3330 				return err;
3331 			err = view_set_child(view, diff_view);
3332 			if (err)
3333 				return err;
3334 			view->focus_child = 1;
3335 		} else
3336 			*new_view = diff_view;
3337 		break;
3338 	case 't':
3339 		view->count = 0;
3340 		if (s->selected_entry == NULL)
3341 			break;
3342 		if (view_is_parent_view(view))
3343 			view_get_split(view, &begin_y, &begin_x);
3344 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3345 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3346 		    s->repo);
3347 		if (err)
3348 			break;
3349 		if (view_is_parent_view(view) &&
3350 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3351 			err = view_init_hsplit(view, begin_y);
3352 			if (err)
3353 				break;
3354 		}
3355 		view->focussed = 0;
3356 		tree_view->focussed = 1;
3357 		tree_view->mode = view->mode;
3358 		tree_view->nlines = view->lines - begin_y;
3359 		if (view_is_parent_view(view)) {
3360 			view_transfer_size(tree_view, view);
3361 			err = view_close_child(view);
3362 			if (err)
3363 				return err;
3364 			err = view_set_child(view, tree_view);
3365 			if (err)
3366 				return err;
3367 			view->focus_child = 1;
3368 		} else
3369 			*new_view = tree_view;
3370 		break;
3371 	case KEY_BACKSPACE:
3372 	case CTRL('l'):
3373 	case 'B':
3374 		view->count = 0;
3375 		if (ch == KEY_BACKSPACE &&
3376 		    got_path_is_root_dir(s->in_repo_path))
3377 			break;
3378 		err = stop_log_thread(s);
3379 		if (err)
3380 			return err;
3381 		if (ch == KEY_BACKSPACE) {
3382 			char *parent_path;
3383 			err = got_path_dirname(&parent_path, s->in_repo_path);
3384 			if (err)
3385 				return err;
3386 			free(s->in_repo_path);
3387 			s->in_repo_path = parent_path;
3388 			s->thread_args.in_repo_path = s->in_repo_path;
3389 		} else if (ch == CTRL('l')) {
3390 			struct got_object_id *start_id;
3391 			err = got_repo_match_object_id(&start_id, NULL,
3392 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3393 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3394 			if (err)
3395 				return err;
3396 			free(s->start_id);
3397 			s->start_id = start_id;
3398 			s->thread_args.start_id = s->start_id;
3399 		} else /* 'B' */
3400 			s->log_branches = !s->log_branches;
3401 
3402 		if (s->thread_args.pack_fds == NULL) {
3403 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3404 			if (err)
3405 				return err;
3406 		}
3407 		err = got_repo_open(&s->thread_args.repo,
3408 		    got_repo_get_path(s->repo), NULL,
3409 		    s->thread_args.pack_fds);
3410 		if (err)
3411 			return err;
3412 		tog_free_refs();
3413 		err = tog_load_refs(s->repo, 0);
3414 		if (err)
3415 			return err;
3416 		err = got_commit_graph_open(&s->thread_args.graph,
3417 		    s->in_repo_path, !s->log_branches);
3418 		if (err)
3419 			return err;
3420 		err = got_commit_graph_iter_start(s->thread_args.graph,
3421 		    s->start_id, s->repo, NULL, NULL);
3422 		if (err)
3423 			return err;
3424 		free_commits(&s->commits);
3425 		s->first_displayed_entry = NULL;
3426 		s->last_displayed_entry = NULL;
3427 		s->selected_entry = NULL;
3428 		s->selected = 0;
3429 		s->thread_args.log_complete = 0;
3430 		s->quit = 0;
3431 		s->thread_args.commits_needed = view->lines;
3432 		s->matched_entry = NULL;
3433 		s->search_entry = NULL;
3434 		break;
3435 	case 'r':
3436 		view->count = 0;
3437 		if (view_is_parent_view(view))
3438 			view_get_split(view, &begin_y, &begin_x);
3439 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3440 		if (ref_view == NULL)
3441 			return got_error_from_errno("view_open");
3442 		err = open_ref_view(ref_view, s->repo);
3443 		if (err) {
3444 			view_close(ref_view);
3445 			return err;
3446 		}
3447 		if (view_is_parent_view(view) &&
3448 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3449 			err = view_init_hsplit(view, begin_y);
3450 			if (err)
3451 				break;
3452 		}
3453 		view->focussed = 0;
3454 		ref_view->focussed = 1;
3455 		ref_view->mode = view->mode;
3456 		ref_view->nlines = view->lines - begin_y;
3457 		if (view_is_parent_view(view)) {
3458 			view_transfer_size(ref_view, view);
3459 			err = view_close_child(view);
3460 			if (err)
3461 				return err;
3462 			err = view_set_child(view, ref_view);
3463 			if (err)
3464 				return err;
3465 			view->focus_child = 1;
3466 		} else
3467 			*new_view = ref_view;
3468 		break;
3469 	default:
3470 		view->count = 0;
3471 		break;
3472 	}
3473 
3474 	return err;
3475 }
3476 
3477 static const struct got_error *
3478 apply_unveil(const char *repo_path, const char *worktree_path)
3479 {
3480 	const struct got_error *error;
3481 
3482 #ifdef PROFILE
3483 	if (unveil("gmon.out", "rwc") != 0)
3484 		return got_error_from_errno2("unveil", "gmon.out");
3485 #endif
3486 	if (repo_path && unveil(repo_path, "r") != 0)
3487 		return got_error_from_errno2("unveil", repo_path);
3488 
3489 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3490 		return got_error_from_errno2("unveil", worktree_path);
3491 
3492 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3493 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3494 
3495 	error = got_privsep_unveil_exec_helpers();
3496 	if (error != NULL)
3497 		return error;
3498 
3499 	if (unveil(NULL, NULL) != 0)
3500 		return got_error_from_errno("unveil");
3501 
3502 	return NULL;
3503 }
3504 
3505 static void
3506 init_curses(void)
3507 {
3508 	/*
3509 	 * Override default signal handlers before starting ncurses.
3510 	 * This should prevent ncurses from installing its own
3511 	 * broken cleanup() signal handler.
3512 	 */
3513 	signal(SIGWINCH, tog_sigwinch);
3514 	signal(SIGPIPE, tog_sigpipe);
3515 	signal(SIGCONT, tog_sigcont);
3516 	signal(SIGINT, tog_sigint);
3517 	signal(SIGTERM, tog_sigterm);
3518 
3519 	initscr();
3520 	cbreak();
3521 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3522 	noecho();
3523 	nonl();
3524 	intrflush(stdscr, FALSE);
3525 	keypad(stdscr, TRUE);
3526 	curs_set(0);
3527 	if (getenv("TOG_COLORS") != NULL) {
3528 		start_color();
3529 		use_default_colors();
3530 	}
3531 }
3532 
3533 static const struct got_error *
3534 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3535     struct got_repository *repo, struct got_worktree *worktree)
3536 {
3537 	const struct got_error *err = NULL;
3538 
3539 	if (argc == 0) {
3540 		*in_repo_path = strdup("/");
3541 		if (*in_repo_path == NULL)
3542 			return got_error_from_errno("strdup");
3543 		return NULL;
3544 	}
3545 
3546 	if (worktree) {
3547 		const char *prefix = got_worktree_get_path_prefix(worktree);
3548 		char *p;
3549 
3550 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3551 		if (err)
3552 			return err;
3553 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3554 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3555 		    p) == -1) {
3556 			err = got_error_from_errno("asprintf");
3557 			*in_repo_path = NULL;
3558 		}
3559 		free(p);
3560 	} else
3561 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3562 
3563 	return err;
3564 }
3565 
3566 static const struct got_error *
3567 cmd_log(int argc, char *argv[])
3568 {
3569 	const struct got_error *error;
3570 	struct got_repository *repo = NULL;
3571 	struct got_worktree *worktree = NULL;
3572 	struct got_object_id *start_id = NULL;
3573 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3574 	char *start_commit = NULL, *label = NULL;
3575 	struct got_reference *ref = NULL;
3576 	const char *head_ref_name = NULL;
3577 	int ch, log_branches = 0;
3578 	struct tog_view *view;
3579 	int *pack_fds = NULL;
3580 
3581 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3582 		switch (ch) {
3583 		case 'b':
3584 			log_branches = 1;
3585 			break;
3586 		case 'c':
3587 			start_commit = optarg;
3588 			break;
3589 		case 'r':
3590 			repo_path = realpath(optarg, NULL);
3591 			if (repo_path == NULL)
3592 				return got_error_from_errno2("realpath",
3593 				    optarg);
3594 			break;
3595 		default:
3596 			usage_log();
3597 			/* NOTREACHED */
3598 		}
3599 	}
3600 
3601 	argc -= optind;
3602 	argv += optind;
3603 
3604 	if (argc > 1)
3605 		usage_log();
3606 
3607 	error = got_repo_pack_fds_open(&pack_fds);
3608 	if (error != NULL)
3609 		goto done;
3610 
3611 	if (repo_path == NULL) {
3612 		cwd = getcwd(NULL, 0);
3613 		if (cwd == NULL)
3614 			return got_error_from_errno("getcwd");
3615 		error = got_worktree_open(&worktree, cwd);
3616 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3617 			goto done;
3618 		if (worktree)
3619 			repo_path =
3620 			    strdup(got_worktree_get_repo_path(worktree));
3621 		else
3622 			repo_path = strdup(cwd);
3623 		if (repo_path == NULL) {
3624 			error = got_error_from_errno("strdup");
3625 			goto done;
3626 		}
3627 	}
3628 
3629 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3630 	if (error != NULL)
3631 		goto done;
3632 
3633 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3634 	    repo, worktree);
3635 	if (error)
3636 		goto done;
3637 
3638 	init_curses();
3639 
3640 	error = apply_unveil(got_repo_get_path(repo),
3641 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3642 	if (error)
3643 		goto done;
3644 
3645 	/* already loaded by tog_log_with_path()? */
3646 	if (TAILQ_EMPTY(&tog_refs)) {
3647 		error = tog_load_refs(repo, 0);
3648 		if (error)
3649 			goto done;
3650 	}
3651 
3652 	if (start_commit == NULL) {
3653 		error = got_repo_match_object_id(&start_id, &label,
3654 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3655 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3656 		if (error)
3657 			goto done;
3658 		head_ref_name = label;
3659 	} else {
3660 		error = got_ref_open(&ref, repo, start_commit, 0);
3661 		if (error == NULL)
3662 			head_ref_name = got_ref_get_name(ref);
3663 		else if (error->code != GOT_ERR_NOT_REF)
3664 			goto done;
3665 		error = got_repo_match_object_id(&start_id, NULL,
3666 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3667 		if (error)
3668 			goto done;
3669 	}
3670 
3671 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3672 	if (view == NULL) {
3673 		error = got_error_from_errno("view_open");
3674 		goto done;
3675 	}
3676 	error = open_log_view(view, start_id, repo, head_ref_name,
3677 	    in_repo_path, log_branches);
3678 	if (error)
3679 		goto done;
3680 	if (worktree) {
3681 		/* Release work tree lock. */
3682 		got_worktree_close(worktree);
3683 		worktree = NULL;
3684 	}
3685 	error = view_loop(view);
3686 done:
3687 	free(in_repo_path);
3688 	free(repo_path);
3689 	free(cwd);
3690 	free(start_id);
3691 	free(label);
3692 	if (ref)
3693 		got_ref_close(ref);
3694 	if (repo) {
3695 		const struct got_error *close_err = got_repo_close(repo);
3696 		if (error == NULL)
3697 			error = close_err;
3698 	}
3699 	if (worktree)
3700 		got_worktree_close(worktree);
3701 	if (pack_fds) {
3702 		const struct got_error *pack_err =
3703 		    got_repo_pack_fds_close(pack_fds);
3704 		if (error == NULL)
3705 			error = pack_err;
3706 	}
3707 	tog_free_refs();
3708 	return error;
3709 }
3710 
3711 __dead static void
3712 usage_diff(void)
3713 {
3714 	endwin();
3715 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3716 	    "[-w] object1 object2\n", getprogname());
3717 	exit(1);
3718 }
3719 
3720 static int
3721 match_line(const char *line, regex_t *regex, size_t nmatch,
3722     regmatch_t *regmatch)
3723 {
3724 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3725 }
3726 
3727 static struct tog_color *
3728 match_color(struct tog_colors *colors, const char *line)
3729 {
3730 	struct tog_color *tc = NULL;
3731 
3732 	STAILQ_FOREACH(tc, colors, entry) {
3733 		if (match_line(line, &tc->regex, 0, NULL))
3734 			return tc;
3735 	}
3736 
3737 	return NULL;
3738 }
3739 
3740 static const struct got_error *
3741 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3742     WINDOW *window, int skipcol, regmatch_t *regmatch)
3743 {
3744 	const struct got_error *err = NULL;
3745 	char *exstr = NULL;
3746 	wchar_t *wline = NULL;
3747 	int rme, rms, n, width, scrollx;
3748 	int width0 = 0, width1 = 0, width2 = 0;
3749 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3750 
3751 	*wtotal = 0;
3752 
3753 	rms = regmatch->rm_so;
3754 	rme = regmatch->rm_eo;
3755 
3756 	err = expand_tab(&exstr, line);
3757 	if (err)
3758 		return err;
3759 
3760 	/* Split the line into 3 segments, according to match offsets. */
3761 	seg0 = strndup(exstr, rms);
3762 	if (seg0 == NULL) {
3763 		err = got_error_from_errno("strndup");
3764 		goto done;
3765 	}
3766 	seg1 = strndup(exstr + rms, rme - rms);
3767 	if (seg1 == NULL) {
3768 		err = got_error_from_errno("strndup");
3769 		goto done;
3770 	}
3771 	seg2 = strdup(exstr + rme);
3772 	if (seg2 == NULL) {
3773 		err = got_error_from_errno("strndup");
3774 		goto done;
3775 	}
3776 
3777 	/* draw up to matched token if we haven't scrolled past it */
3778 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3779 	    col_tab_align, 1);
3780 	if (err)
3781 		goto done;
3782 	n = MAX(width0 - skipcol, 0);
3783 	if (n) {
3784 		free(wline);
3785 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3786 		    wlimit, col_tab_align, 1);
3787 		if (err)
3788 			goto done;
3789 		waddwstr(window, &wline[scrollx]);
3790 		wlimit -= width;
3791 		*wtotal += width;
3792 	}
3793 
3794 	if (wlimit > 0) {
3795 		int i = 0, w = 0;
3796 		size_t wlen;
3797 
3798 		free(wline);
3799 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3800 		    col_tab_align, 1);
3801 		if (err)
3802 			goto done;
3803 		wlen = wcslen(wline);
3804 		while (i < wlen) {
3805 			width = wcwidth(wline[i]);
3806 			if (width == -1) {
3807 				/* should not happen, tabs are expanded */
3808 				err = got_error(GOT_ERR_RANGE);
3809 				goto done;
3810 			}
3811 			if (width0 + w + width > skipcol)
3812 				break;
3813 			w += width;
3814 			i++;
3815 		}
3816 		/* draw (visible part of) matched token (if scrolled into it) */
3817 		if (width1 - w > 0) {
3818 			wattron(window, A_STANDOUT);
3819 			waddwstr(window, &wline[i]);
3820 			wattroff(window, A_STANDOUT);
3821 			wlimit -= (width1 - w);
3822 			*wtotal += (width1 - w);
3823 		}
3824 	}
3825 
3826 	if (wlimit > 0) {  /* draw rest of line */
3827 		free(wline);
3828 		if (skipcol > width0 + width1) {
3829 			err = format_line(&wline, &width2, &scrollx, seg2,
3830 			    skipcol - (width0 + width1), wlimit,
3831 			    col_tab_align, 1);
3832 			if (err)
3833 				goto done;
3834 			waddwstr(window, &wline[scrollx]);
3835 		} else {
3836 			err = format_line(&wline, &width2, NULL, seg2, 0,
3837 			    wlimit, col_tab_align, 1);
3838 			if (err)
3839 				goto done;
3840 			waddwstr(window, wline);
3841 		}
3842 		*wtotal += width2;
3843 	}
3844 done:
3845 	free(wline);
3846 	free(exstr);
3847 	free(seg0);
3848 	free(seg1);
3849 	free(seg2);
3850 	return err;
3851 }
3852 
3853 static const struct got_error *
3854 draw_file(struct tog_view *view, const char *header)
3855 {
3856 	struct tog_diff_view_state *s = &view->state.diff;
3857 	regmatch_t *regmatch = &view->regmatch;
3858 	const struct got_error *err;
3859 	int nprinted = 0;
3860 	char *line;
3861 	size_t linesize = 0;
3862 	ssize_t linelen;
3863 	struct tog_color *tc;
3864 	wchar_t *wline;
3865 	int width;
3866 	int max_lines = view->nlines;
3867 	int nlines = s->nlines;
3868 	off_t line_offset;
3869 
3870 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3871 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3872 		return got_error_from_errno("fseek");
3873 
3874 	werase(view->window);
3875 
3876 	if (header) {
3877 		if (asprintf(&line, "[%d/%d] %s",
3878 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3879 		    header) == -1)
3880 			return got_error_from_errno("asprintf");
3881 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3882 		    0, 0);
3883 		free(line);
3884 		if (err)
3885 			return err;
3886 
3887 		if (view_needs_focus_indication(view))
3888 			wstandout(view->window);
3889 		waddwstr(view->window, wline);
3890 		free(wline);
3891 		wline = NULL;
3892 		if (view_needs_focus_indication(view))
3893 			wstandend(view->window);
3894 		if (width <= view->ncols - 1)
3895 			waddch(view->window, '\n');
3896 
3897 		if (max_lines <= 1)
3898 			return NULL;
3899 		max_lines--;
3900 	}
3901 
3902 	s->eof = 0;
3903 	view->maxx = 0;
3904 	line = NULL;
3905 	while (max_lines > 0 && nprinted < max_lines) {
3906 		linelen = getline(&line, &linesize, s->f);
3907 		if (linelen == -1) {
3908 			if (feof(s->f)) {
3909 				s->eof = 1;
3910 				break;
3911 			}
3912 			free(line);
3913 			return got_ferror(s->f, GOT_ERR_IO);
3914 		}
3915 
3916 		/* Set view->maxx based on full line length. */
3917 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3918 		    view->x ? 1 : 0);
3919 		if (err) {
3920 			free(line);
3921 			return err;
3922 		}
3923 		view->maxx = MAX(view->maxx, width);
3924 		free(wline);
3925 		wline = NULL;
3926 
3927 		tc = match_color(&s->colors, line);
3928 		if (tc)
3929 			wattr_on(view->window,
3930 			    COLOR_PAIR(tc->colorpair), NULL);
3931 		if (s->first_displayed_line + nprinted == s->matched_line &&
3932 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3933 			err = add_matched_line(&width, line, view->ncols, 0,
3934 			    view->window, view->x, regmatch);
3935 			if (err) {
3936 				free(line);
3937 				return err;
3938 			}
3939 		} else {
3940 			int skip;
3941 			err = format_line(&wline, &width, &skip, line,
3942 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3943 			if (err) {
3944 				free(line);
3945 				return err;
3946 			}
3947 			waddwstr(view->window, &wline[skip]);
3948 			free(wline);
3949 			wline = NULL;
3950 		}
3951 		if (tc)
3952 			wattr_off(view->window,
3953 			    COLOR_PAIR(tc->colorpair), NULL);
3954 		if (width <= view->ncols - 1)
3955 			waddch(view->window, '\n');
3956 		nprinted++;
3957 	}
3958 	free(line);
3959 	if (nprinted >= 1)
3960 		s->last_displayed_line = s->first_displayed_line +
3961 		    (nprinted - 1);
3962 	else
3963 		s->last_displayed_line = s->first_displayed_line;
3964 
3965 	view_border(view);
3966 
3967 	if (s->eof) {
3968 		while (nprinted < view->nlines) {
3969 			waddch(view->window, '\n');
3970 			nprinted++;
3971 		}
3972 
3973 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3974 		    view->ncols, 0, 0);
3975 		if (err) {
3976 			return err;
3977 		}
3978 
3979 		wstandout(view->window);
3980 		waddwstr(view->window, wline);
3981 		free(wline);
3982 		wline = NULL;
3983 		wstandend(view->window);
3984 	}
3985 
3986 	return NULL;
3987 }
3988 
3989 static char *
3990 get_datestr(time_t *time, char *datebuf)
3991 {
3992 	struct tm mytm, *tm;
3993 	char *p, *s;
3994 
3995 	tm = gmtime_r(time, &mytm);
3996 	if (tm == NULL)
3997 		return NULL;
3998 	s = asctime_r(tm, datebuf);
3999 	if (s == NULL)
4000 		return NULL;
4001 	p = strchr(s, '\n');
4002 	if (p)
4003 		*p = '\0';
4004 	return s;
4005 }
4006 
4007 static const struct got_error *
4008 get_changed_paths(struct got_pathlist_head *paths,
4009     struct got_commit_object *commit, struct got_repository *repo)
4010 {
4011 	const struct got_error *err = NULL;
4012 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4013 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4014 	struct got_object_qid *qid;
4015 
4016 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4017 	if (qid != NULL) {
4018 		struct got_commit_object *pcommit;
4019 		err = got_object_open_as_commit(&pcommit, repo,
4020 		    &qid->id);
4021 		if (err)
4022 			return err;
4023 
4024 		tree_id1 = got_object_id_dup(
4025 		    got_object_commit_get_tree_id(pcommit));
4026 		if (tree_id1 == NULL) {
4027 			got_object_commit_close(pcommit);
4028 			return got_error_from_errno("got_object_id_dup");
4029 		}
4030 		got_object_commit_close(pcommit);
4031 
4032 	}
4033 
4034 	if (tree_id1) {
4035 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4036 		if (err)
4037 			goto done;
4038 	}
4039 
4040 	tree_id2 = got_object_commit_get_tree_id(commit);
4041 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4042 	if (err)
4043 		goto done;
4044 
4045 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4046 	    got_diff_tree_collect_changed_paths, paths, 0);
4047 done:
4048 	if (tree1)
4049 		got_object_tree_close(tree1);
4050 	if (tree2)
4051 		got_object_tree_close(tree2);
4052 	free(tree_id1);
4053 	return err;
4054 }
4055 
4056 static const struct got_error *
4057 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4058 {
4059 	off_t *p;
4060 
4061 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4062 	if (p == NULL)
4063 		return got_error_from_errno("reallocarray");
4064 	*line_offsets = p;
4065 	(*line_offsets)[*nlines] = off;
4066 	(*nlines)++;
4067 	return NULL;
4068 }
4069 
4070 static const struct got_error *
4071 write_commit_info(off_t **line_offsets, size_t *nlines,
4072     struct got_object_id *commit_id, struct got_reflist_head *refs,
4073     struct got_repository *repo, FILE *outfile)
4074 {
4075 	const struct got_error *err = NULL;
4076 	char datebuf[26], *datestr;
4077 	struct got_commit_object *commit;
4078 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4079 	time_t committer_time;
4080 	const char *author, *committer;
4081 	char *refs_str = NULL;
4082 	struct got_pathlist_head changed_paths;
4083 	struct got_pathlist_entry *pe;
4084 	off_t outoff = 0;
4085 	int n;
4086 
4087 	TAILQ_INIT(&changed_paths);
4088 
4089 	if (refs) {
4090 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4091 		if (err)
4092 			return err;
4093 	}
4094 
4095 	err = got_object_open_as_commit(&commit, repo, commit_id);
4096 	if (err)
4097 		return err;
4098 
4099 	err = got_object_id_str(&id_str, commit_id);
4100 	if (err) {
4101 		err = got_error_from_errno("got_object_id_str");
4102 		goto done;
4103 	}
4104 
4105 	err = add_line_offset(line_offsets, nlines, 0);
4106 	if (err)
4107 		goto done;
4108 
4109 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4110 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4111 	if (n < 0) {
4112 		err = got_error_from_errno("fprintf");
4113 		goto done;
4114 	}
4115 	outoff += n;
4116 	err = add_line_offset(line_offsets, nlines, outoff);
4117 	if (err)
4118 		goto done;
4119 
4120 	n = fprintf(outfile, "from: %s\n",
4121 	    got_object_commit_get_author(commit));
4122 	if (n < 0) {
4123 		err = got_error_from_errno("fprintf");
4124 		goto done;
4125 	}
4126 	outoff += n;
4127 	err = add_line_offset(line_offsets, nlines, outoff);
4128 	if (err)
4129 		goto done;
4130 
4131 	committer_time = got_object_commit_get_committer_time(commit);
4132 	datestr = get_datestr(&committer_time, datebuf);
4133 	if (datestr) {
4134 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4135 		if (n < 0) {
4136 			err = got_error_from_errno("fprintf");
4137 			goto done;
4138 		}
4139 		outoff += n;
4140 		err = add_line_offset(line_offsets, nlines, outoff);
4141 		if (err)
4142 			goto done;
4143 	}
4144 	author = got_object_commit_get_author(commit);
4145 	committer = got_object_commit_get_committer(commit);
4146 	if (strcmp(author, committer) != 0) {
4147 		n = fprintf(outfile, "via: %s\n", committer);
4148 		if (n < 0) {
4149 			err = got_error_from_errno("fprintf");
4150 			goto done;
4151 		}
4152 		outoff += n;
4153 		err = add_line_offset(line_offsets, nlines, outoff);
4154 		if (err)
4155 			goto done;
4156 	}
4157 	if (got_object_commit_get_nparents(commit) > 1) {
4158 		const struct got_object_id_queue *parent_ids;
4159 		struct got_object_qid *qid;
4160 		int pn = 1;
4161 		parent_ids = got_object_commit_get_parent_ids(commit);
4162 		STAILQ_FOREACH(qid, parent_ids, entry) {
4163 			err = got_object_id_str(&id_str, &qid->id);
4164 			if (err)
4165 				goto done;
4166 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4167 			if (n < 0) {
4168 				err = got_error_from_errno("fprintf");
4169 				goto done;
4170 			}
4171 			outoff += n;
4172 			err = add_line_offset(line_offsets, nlines, outoff);
4173 			if (err)
4174 				goto done;
4175 			free(id_str);
4176 			id_str = NULL;
4177 		}
4178 	}
4179 
4180 	err = got_object_commit_get_logmsg(&logmsg, commit);
4181 	if (err)
4182 		goto done;
4183 	s = logmsg;
4184 	while ((line = strsep(&s, "\n")) != NULL) {
4185 		n = fprintf(outfile, "%s\n", line);
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 	}
4195 
4196 	err = get_changed_paths(&changed_paths, commit, repo);
4197 	if (err)
4198 		goto done;
4199 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4200 		struct got_diff_changed_path *cp = pe->data;
4201 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4202 		if (n < 0) {
4203 			err = got_error_from_errno("fprintf");
4204 			goto done;
4205 		}
4206 		outoff += n;
4207 		err = add_line_offset(line_offsets, nlines, outoff);
4208 		if (err)
4209 			goto done;
4210 		free((char *)pe->path);
4211 		free(pe->data);
4212 	}
4213 
4214 	fputc('\n', outfile);
4215 	outoff++;
4216 	err = add_line_offset(line_offsets, nlines, outoff);
4217 done:
4218 	got_pathlist_free(&changed_paths);
4219 	free(id_str);
4220 	free(logmsg);
4221 	free(refs_str);
4222 	got_object_commit_close(commit);
4223 	if (err) {
4224 		free(*line_offsets);
4225 		*line_offsets = NULL;
4226 		*nlines = 0;
4227 	}
4228 	return err;
4229 }
4230 
4231 static const struct got_error *
4232 create_diff(struct tog_diff_view_state *s)
4233 {
4234 	const struct got_error *err = NULL;
4235 	FILE *f = NULL;
4236 	int obj_type;
4237 
4238 	free(s->line_offsets);
4239 	s->line_offsets = malloc(sizeof(off_t));
4240 	if (s->line_offsets == NULL)
4241 		return got_error_from_errno("malloc");
4242 	s->nlines = 0;
4243 
4244 	f = got_opentemp();
4245 	if (f == NULL) {
4246 		err = got_error_from_errno("got_opentemp");
4247 		goto done;
4248 	}
4249 	if (s->f && fclose(s->f) == EOF) {
4250 		err = got_error_from_errno("fclose");
4251 		goto done;
4252 	}
4253 	s->f = f;
4254 
4255 	if (s->id1)
4256 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4257 	else
4258 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4259 	if (err)
4260 		goto done;
4261 
4262 	switch (obj_type) {
4263 	case GOT_OBJ_TYPE_BLOB:
4264 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4265 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4266 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4267 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4268 		break;
4269 	case GOT_OBJ_TYPE_TREE:
4270 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4271 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4272 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4273 		    s->force_text_diff, s->repo, s->f);
4274 		break;
4275 	case GOT_OBJ_TYPE_COMMIT: {
4276 		const struct got_object_id_queue *parent_ids;
4277 		struct got_object_qid *pid;
4278 		struct got_commit_object *commit2;
4279 		struct got_reflist_head *refs;
4280 
4281 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4282 		if (err)
4283 			goto done;
4284 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4285 		/* Show commit info if we're diffing to a parent/root commit. */
4286 		if (s->id1 == NULL) {
4287 			err = write_commit_info(&s->line_offsets, &s->nlines,
4288 			    s->id2, refs, s->repo, s->f);
4289 			if (err)
4290 				goto done;
4291 		} else {
4292 			parent_ids = got_object_commit_get_parent_ids(commit2);
4293 			STAILQ_FOREACH(pid, parent_ids, entry) {
4294 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4295 					err = write_commit_info(
4296 					    &s->line_offsets, &s->nlines,
4297 					    s->id2, refs, s->repo, s->f);
4298 					if (err)
4299 						goto done;
4300 					break;
4301 				}
4302 			}
4303 		}
4304 		got_object_commit_close(commit2);
4305 
4306 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4307 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4308 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4309 		    s->force_text_diff, s->repo, s->f);
4310 		break;
4311 	}
4312 	default:
4313 		err = got_error(GOT_ERR_OBJ_TYPE);
4314 		break;
4315 	}
4316 	if (err)
4317 		goto done;
4318 done:
4319 	if (s->f && fflush(s->f) != 0 && err == NULL)
4320 		err = got_error_from_errno("fflush");
4321 	return err;
4322 }
4323 
4324 static void
4325 diff_view_indicate_progress(struct tog_view *view)
4326 {
4327 	mvwaddstr(view->window, 0, 0, "diffing...");
4328 	update_panels();
4329 	doupdate();
4330 }
4331 
4332 static const struct got_error *
4333 search_start_diff_view(struct tog_view *view)
4334 {
4335 	struct tog_diff_view_state *s = &view->state.diff;
4336 
4337 	s->matched_line = 0;
4338 	return NULL;
4339 }
4340 
4341 static const struct got_error *
4342 search_next_diff_view(struct tog_view *view)
4343 {
4344 	struct tog_diff_view_state *s = &view->state.diff;
4345 	const struct got_error *err = NULL;
4346 	int lineno;
4347 	char *line = NULL;
4348 	size_t linesize = 0;
4349 	ssize_t linelen;
4350 
4351 	if (!view->searching) {
4352 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4353 		return NULL;
4354 	}
4355 
4356 	if (s->matched_line) {
4357 		if (view->searching == TOG_SEARCH_FORWARD)
4358 			lineno = s->matched_line + 1;
4359 		else
4360 			lineno = s->matched_line - 1;
4361 	} else
4362 		lineno = s->first_displayed_line;
4363 
4364 	while (1) {
4365 		off_t offset;
4366 
4367 		if (lineno <= 0 || lineno > s->nlines) {
4368 			if (s->matched_line == 0) {
4369 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4370 				break;
4371 			}
4372 
4373 			if (view->searching == TOG_SEARCH_FORWARD)
4374 				lineno = 1;
4375 			else
4376 				lineno = s->nlines;
4377 		}
4378 
4379 		offset = s->line_offsets[lineno - 1];
4380 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4381 			free(line);
4382 			return got_error_from_errno("fseeko");
4383 		}
4384 		linelen = getline(&line, &linesize, s->f);
4385 		if (linelen != -1) {
4386 			char *exstr;
4387 			err = expand_tab(&exstr, line);
4388 			if (err)
4389 				break;
4390 			if (match_line(exstr, &view->regex, 1,
4391 			    &view->regmatch)) {
4392 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4393 				s->matched_line = lineno;
4394 				free(exstr);
4395 				break;
4396 			}
4397 			free(exstr);
4398 		}
4399 		if (view->searching == TOG_SEARCH_FORWARD)
4400 			lineno++;
4401 		else
4402 			lineno--;
4403 	}
4404 	free(line);
4405 
4406 	if (s->matched_line) {
4407 		s->first_displayed_line = s->matched_line;
4408 		s->selected_line = 1;
4409 	}
4410 
4411 	return err;
4412 }
4413 
4414 static const struct got_error *
4415 close_diff_view(struct tog_view *view)
4416 {
4417 	const struct got_error *err = NULL;
4418 	struct tog_diff_view_state *s = &view->state.diff;
4419 
4420 	free(s->id1);
4421 	s->id1 = NULL;
4422 	free(s->id2);
4423 	s->id2 = NULL;
4424 	if (s->f && fclose(s->f) == EOF)
4425 		err = got_error_from_errno("fclose");
4426 	s->f = NULL;
4427 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4428 		err = got_error_from_errno("fclose");
4429 	s->f1 = NULL;
4430 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4431 		err = got_error_from_errno("fclose");
4432 	s->f2 = NULL;
4433 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4434 		err = got_error_from_errno("close");
4435 	s->fd1 = -1;
4436 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4437 		err = got_error_from_errno("close");
4438 	s->fd2 = -1;
4439 	free_colors(&s->colors);
4440 	free(s->line_offsets);
4441 	s->line_offsets = NULL;
4442 	s->nlines = 0;
4443 	return err;
4444 }
4445 
4446 static const struct got_error *
4447 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4448     struct got_object_id *id2, const char *label1, const char *label2,
4449     int diff_context, int ignore_whitespace, int force_text_diff,
4450     struct tog_view *parent_view, struct got_repository *repo)
4451 {
4452 	const struct got_error *err;
4453 	struct tog_diff_view_state *s = &view->state.diff;
4454 
4455 	memset(s, 0, sizeof(*s));
4456 	s->fd1 = -1;
4457 	s->fd2 = -1;
4458 
4459 	if (id1 != NULL && id2 != NULL) {
4460 	    int type1, type2;
4461 	    err = got_object_get_type(&type1, repo, id1);
4462 	    if (err)
4463 		return err;
4464 	    err = got_object_get_type(&type2, repo, id2);
4465 	    if (err)
4466 		return err;
4467 
4468 	    if (type1 != type2)
4469 		return got_error(GOT_ERR_OBJ_TYPE);
4470 	}
4471 	s->first_displayed_line = 1;
4472 	s->last_displayed_line = view->nlines;
4473 	s->selected_line = 1;
4474 	s->repo = repo;
4475 	s->id1 = id1;
4476 	s->id2 = id2;
4477 	s->label1 = label1;
4478 	s->label2 = label2;
4479 
4480 	if (id1) {
4481 		s->id1 = got_object_id_dup(id1);
4482 		if (s->id1 == NULL)
4483 			return got_error_from_errno("got_object_id_dup");
4484 	} else
4485 		s->id1 = NULL;
4486 
4487 	s->id2 = got_object_id_dup(id2);
4488 	if (s->id2 == NULL) {
4489 		err = got_error_from_errno("got_object_id_dup");
4490 		goto done;
4491 	}
4492 
4493 	s->f1 = got_opentemp();
4494 	if (s->f1 == NULL) {
4495 		err = got_error_from_errno("got_opentemp");
4496 		goto done;
4497 	}
4498 
4499 	s->f2 = got_opentemp();
4500 	if (s->f2 == NULL) {
4501 		err = got_error_from_errno("got_opentemp");
4502 		goto done;
4503 	}
4504 
4505 	s->fd1 = got_opentempfd();
4506 	if (s->fd1 == -1) {
4507 		err = got_error_from_errno("got_opentempfd");
4508 		goto done;
4509 	}
4510 
4511 	s->fd2 = got_opentempfd();
4512 	if (s->fd2 == -1) {
4513 		err = got_error_from_errno("got_opentempfd");
4514 		goto done;
4515 	}
4516 
4517 	s->first_displayed_line = 1;
4518 	s->last_displayed_line = view->nlines;
4519 	s->diff_context = diff_context;
4520 	s->ignore_whitespace = ignore_whitespace;
4521 	s->force_text_diff = force_text_diff;
4522 	s->parent_view = parent_view;
4523 	s->repo = repo;
4524 
4525 	STAILQ_INIT(&s->colors);
4526 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4527 		err = add_color(&s->colors,
4528 		    "^-", TOG_COLOR_DIFF_MINUS,
4529 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4530 		if (err)
4531 			goto done;
4532 		err = add_color(&s->colors, "^\\+",
4533 		    TOG_COLOR_DIFF_PLUS,
4534 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4535 		if (err)
4536 			goto done;
4537 		err = add_color(&s->colors,
4538 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4539 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4540 		if (err)
4541 			goto done;
4542 
4543 		err = add_color(&s->colors,
4544 		    "^(commit [0-9a-f]|parent [0-9]|"
4545 		    "(blob|file|tree|commit) [-+] |"
4546 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4547 		    get_color_value("TOG_COLOR_DIFF_META"));
4548 		if (err)
4549 			goto done;
4550 
4551 		err = add_color(&s->colors,
4552 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4553 		    get_color_value("TOG_COLOR_AUTHOR"));
4554 		if (err)
4555 			goto done;
4556 
4557 		err = add_color(&s->colors,
4558 		    "^date: ", TOG_COLOR_DATE,
4559 		    get_color_value("TOG_COLOR_DATE"));
4560 		if (err)
4561 			goto done;
4562 	}
4563 
4564 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4565 	    view_is_splitscreen(view))
4566 		show_log_view(parent_view); /* draw border */
4567 	diff_view_indicate_progress(view);
4568 
4569 	err = create_diff(s);
4570 
4571 	view->show = show_diff_view;
4572 	view->input = input_diff_view;
4573 	view->reset = reset_diff_view;
4574 	view->close = close_diff_view;
4575 	view->search_start = search_start_diff_view;
4576 	view->search_next = search_next_diff_view;
4577 done:
4578 	if (err)
4579 		close_diff_view(view);
4580 	return err;
4581 }
4582 
4583 static const struct got_error *
4584 show_diff_view(struct tog_view *view)
4585 {
4586 	const struct got_error *err;
4587 	struct tog_diff_view_state *s = &view->state.diff;
4588 	char *id_str1 = NULL, *id_str2, *header;
4589 	const char *label1, *label2;
4590 
4591 	if (s->id1) {
4592 		err = got_object_id_str(&id_str1, s->id1);
4593 		if (err)
4594 			return err;
4595 		label1 = s->label1 ? : id_str1;
4596 	} else
4597 		label1 = "/dev/null";
4598 
4599 	err = got_object_id_str(&id_str2, s->id2);
4600 	if (err)
4601 		return err;
4602 	label2 = s->label2 ? : id_str2;
4603 
4604 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4605 		err = got_error_from_errno("asprintf");
4606 		free(id_str1);
4607 		free(id_str2);
4608 		return err;
4609 	}
4610 	free(id_str1);
4611 	free(id_str2);
4612 
4613 	err = draw_file(view, header);
4614 	free(header);
4615 	return err;
4616 }
4617 
4618 static const struct got_error *
4619 set_selected_commit(struct tog_diff_view_state *s,
4620     struct commit_queue_entry *entry)
4621 {
4622 	const struct got_error *err;
4623 	const struct got_object_id_queue *parent_ids;
4624 	struct got_commit_object *selected_commit;
4625 	struct got_object_qid *pid;
4626 
4627 	free(s->id2);
4628 	s->id2 = got_object_id_dup(entry->id);
4629 	if (s->id2 == NULL)
4630 		return got_error_from_errno("got_object_id_dup");
4631 
4632 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4633 	if (err)
4634 		return err;
4635 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4636 	free(s->id1);
4637 	pid = STAILQ_FIRST(parent_ids);
4638 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4639 	got_object_commit_close(selected_commit);
4640 	return NULL;
4641 }
4642 
4643 static const struct got_error *
4644 reset_diff_view(struct tog_view *view)
4645 {
4646 	struct tog_diff_view_state *s = &view->state.diff;
4647 
4648 	view->count = 0;
4649 	wclear(view->window);
4650 	s->first_displayed_line = 1;
4651 	s->last_displayed_line = view->nlines;
4652 	s->matched_line = 0;
4653 	diff_view_indicate_progress(view);
4654 	return create_diff(s);
4655 }
4656 
4657 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4658     int, int, int);
4659 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4660     int, int);
4661 
4662 static const struct got_error *
4663 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4664 {
4665 	const struct got_error *err = NULL;
4666 	struct tog_diff_view_state *s = &view->state.diff;
4667 	struct tog_log_view_state *ls;
4668 	struct commit_queue_entry *old_selected_entry;
4669 	char *line = NULL;
4670 	size_t linesize = 0;
4671 	ssize_t linelen;
4672 	int i, nscroll = view->nlines - 1, up = 0;
4673 
4674 	switch (ch) {
4675 	case '0':
4676 		view->x = 0;
4677 		break;
4678 	case '$':
4679 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4680 		view->count = 0;
4681 		break;
4682 	case KEY_RIGHT:
4683 	case 'l':
4684 		if (view->x + view->ncols / 3 < view->maxx)
4685 			view->x += 2;  /* move two columns right */
4686 		else
4687 			view->count = 0;
4688 		break;
4689 	case KEY_LEFT:
4690 	case 'h':
4691 		view->x -= MIN(view->x, 2);  /* move two columns back */
4692 		if (view->x <= 0)
4693 			view->count = 0;
4694 		break;
4695 	case 'a':
4696 	case 'w':
4697 		if (ch == 'a')
4698 			s->force_text_diff = !s->force_text_diff;
4699 		if (ch == 'w')
4700 			s->ignore_whitespace = !s->ignore_whitespace;
4701 		err = reset_diff_view(view);
4702 		break;
4703 	case 'g':
4704 	case KEY_HOME:
4705 		s->first_displayed_line = 1;
4706 		view->count = 0;
4707 		break;
4708 	case 'G':
4709 	case KEY_END:
4710 		view->count = 0;
4711 		if (s->eof)
4712 			break;
4713 
4714 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4715 		s->eof = 1;
4716 		break;
4717 	case 'k':
4718 	case KEY_UP:
4719 	case CTRL('p'):
4720 		if (s->first_displayed_line > 1)
4721 			s->first_displayed_line--;
4722 		else
4723 			view->count = 0;
4724 		break;
4725 	case CTRL('u'):
4726 	case 'u':
4727 		nscroll /= 2;
4728 		/* FALL THROUGH */
4729 	case KEY_PPAGE:
4730 	case CTRL('b'):
4731 	case 'b':
4732 		if (s->first_displayed_line == 1) {
4733 			view->count = 0;
4734 			break;
4735 		}
4736 		i = 0;
4737 		while (i++ < nscroll && s->first_displayed_line > 1)
4738 			s->first_displayed_line--;
4739 		break;
4740 	case 'j':
4741 	case KEY_DOWN:
4742 	case CTRL('n'):
4743 		if (!s->eof)
4744 			s->first_displayed_line++;
4745 		else
4746 			view->count = 0;
4747 		break;
4748 	case CTRL('d'):
4749 	case 'd':
4750 		nscroll /= 2;
4751 		/* FALL THROUGH */
4752 	case KEY_NPAGE:
4753 	case CTRL('f'):
4754 	case 'f':
4755 	case ' ':
4756 		if (s->eof) {
4757 			view->count = 0;
4758 			break;
4759 		}
4760 		i = 0;
4761 		while (!s->eof && i++ < nscroll) {
4762 			linelen = getline(&line, &linesize, s->f);
4763 			s->first_displayed_line++;
4764 			if (linelen == -1) {
4765 				if (feof(s->f)) {
4766 					s->eof = 1;
4767 				} else
4768 					err = got_ferror(s->f, GOT_ERR_IO);
4769 				break;
4770 			}
4771 		}
4772 		free(line);
4773 		break;
4774 	case '[':
4775 		if (s->diff_context > 0) {
4776 			s->diff_context--;
4777 			s->matched_line = 0;
4778 			diff_view_indicate_progress(view);
4779 			err = create_diff(s);
4780 			if (s->first_displayed_line + view->nlines - 1 >
4781 			    s->nlines) {
4782 				s->first_displayed_line = 1;
4783 				s->last_displayed_line = view->nlines;
4784 			}
4785 		} else
4786 			view->count = 0;
4787 		break;
4788 	case ']':
4789 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4790 			s->diff_context++;
4791 			s->matched_line = 0;
4792 			diff_view_indicate_progress(view);
4793 			err = create_diff(s);
4794 		} else
4795 			view->count = 0;
4796 		break;
4797 	case '<':
4798 	case ',':
4799 		up = 1;
4800 		/* FALL THROUGH */
4801 	case '>':
4802 	case '.':
4803 		if (s->parent_view == NULL) {
4804 			view->count = 0;
4805 			break;
4806 		}
4807 		s->parent_view->count = view->count;
4808 
4809 		if (s->parent_view->type == TOG_VIEW_LOG) {
4810 			ls = &s->parent_view->state.log;
4811 			old_selected_entry = ls->selected_entry;
4812 
4813 			err = input_log_view(NULL, s->parent_view,
4814 			    up ? KEY_UP : KEY_DOWN);
4815 			if (err)
4816 				break;
4817 			view->count = s->parent_view->count;
4818 
4819 			if (old_selected_entry == ls->selected_entry)
4820 				break;
4821 
4822 			err = set_selected_commit(s, ls->selected_entry);
4823 			if (err)
4824 				break;
4825 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4826 			struct tog_blame_view_state *bs;
4827 			struct got_object_id *id, *prev_id;
4828 
4829 			bs = &s->parent_view->state.blame;
4830 			prev_id = get_annotation_for_line(bs->blame.lines,
4831 			    bs->blame.nlines, bs->last_diffed_line);
4832 
4833 			err = input_blame_view(&view, s->parent_view,
4834 			    up ? KEY_UP : KEY_DOWN);
4835 			if (err)
4836 				break;
4837 			view->count = s->parent_view->count;
4838 
4839 			if (prev_id == NULL)
4840 				break;
4841 			id = get_selected_commit_id(bs->blame.lines,
4842 			    bs->blame.nlines, bs->first_displayed_line,
4843 			    bs->selected_line);
4844 			if (id == NULL)
4845 				break;
4846 
4847 			if (!got_object_id_cmp(prev_id, id))
4848 				break;
4849 
4850 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4851 			if (err)
4852 				break;
4853 		}
4854 		s->first_displayed_line = 1;
4855 		s->last_displayed_line = view->nlines;
4856 		s->matched_line = 0;
4857 		view->x = 0;
4858 
4859 		diff_view_indicate_progress(view);
4860 		err = create_diff(s);
4861 		break;
4862 	default:
4863 		view->count = 0;
4864 		break;
4865 	}
4866 
4867 	return err;
4868 }
4869 
4870 static const struct got_error *
4871 cmd_diff(int argc, char *argv[])
4872 {
4873 	const struct got_error *error = NULL;
4874 	struct got_repository *repo = NULL;
4875 	struct got_worktree *worktree = NULL;
4876 	struct got_object_id *id1 = NULL, *id2 = NULL;
4877 	char *repo_path = NULL, *cwd = NULL;
4878 	char *id_str1 = NULL, *id_str2 = NULL;
4879 	char *label1 = NULL, *label2 = NULL;
4880 	int diff_context = 3, ignore_whitespace = 0;
4881 	int ch, force_text_diff = 0;
4882 	const char *errstr;
4883 	struct tog_view *view;
4884 	int *pack_fds = NULL;
4885 
4886 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4887 		switch (ch) {
4888 		case 'a':
4889 			force_text_diff = 1;
4890 			break;
4891 		case 'C':
4892 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4893 			    &errstr);
4894 			if (errstr != NULL)
4895 				errx(1, "number of context lines is %s: %s",
4896 				    errstr, errstr);
4897 			break;
4898 		case 'r':
4899 			repo_path = realpath(optarg, NULL);
4900 			if (repo_path == NULL)
4901 				return got_error_from_errno2("realpath",
4902 				    optarg);
4903 			got_path_strip_trailing_slashes(repo_path);
4904 			break;
4905 		case 'w':
4906 			ignore_whitespace = 1;
4907 			break;
4908 		default:
4909 			usage_diff();
4910 			/* NOTREACHED */
4911 		}
4912 	}
4913 
4914 	argc -= optind;
4915 	argv += optind;
4916 
4917 	if (argc == 0) {
4918 		usage_diff(); /* TODO show local worktree changes */
4919 	} else if (argc == 2) {
4920 		id_str1 = argv[0];
4921 		id_str2 = argv[1];
4922 	} else
4923 		usage_diff();
4924 
4925 	error = got_repo_pack_fds_open(&pack_fds);
4926 	if (error)
4927 		goto done;
4928 
4929 	if (repo_path == NULL) {
4930 		cwd = getcwd(NULL, 0);
4931 		if (cwd == NULL)
4932 			return got_error_from_errno("getcwd");
4933 		error = got_worktree_open(&worktree, cwd);
4934 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4935 			goto done;
4936 		if (worktree)
4937 			repo_path =
4938 			    strdup(got_worktree_get_repo_path(worktree));
4939 		else
4940 			repo_path = strdup(cwd);
4941 		if (repo_path == NULL) {
4942 			error = got_error_from_errno("strdup");
4943 			goto done;
4944 		}
4945 	}
4946 
4947 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4948 	if (error)
4949 		goto done;
4950 
4951 	init_curses();
4952 
4953 	error = apply_unveil(got_repo_get_path(repo), NULL);
4954 	if (error)
4955 		goto done;
4956 
4957 	error = tog_load_refs(repo, 0);
4958 	if (error)
4959 		goto done;
4960 
4961 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4962 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4963 	if (error)
4964 		goto done;
4965 
4966 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4967 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4968 	if (error)
4969 		goto done;
4970 
4971 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4972 	if (view == NULL) {
4973 		error = got_error_from_errno("view_open");
4974 		goto done;
4975 	}
4976 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4977 	    ignore_whitespace, force_text_diff, NULL,  repo);
4978 	if (error)
4979 		goto done;
4980 	error = view_loop(view);
4981 done:
4982 	free(label1);
4983 	free(label2);
4984 	free(repo_path);
4985 	free(cwd);
4986 	if (repo) {
4987 		const struct got_error *close_err = got_repo_close(repo);
4988 		if (error == NULL)
4989 			error = close_err;
4990 	}
4991 	if (worktree)
4992 		got_worktree_close(worktree);
4993 	if (pack_fds) {
4994 		const struct got_error *pack_err =
4995 		    got_repo_pack_fds_close(pack_fds);
4996 		if (error == NULL)
4997 			error = pack_err;
4998 	}
4999 	tog_free_refs();
5000 	return error;
5001 }
5002 
5003 __dead static void
5004 usage_blame(void)
5005 {
5006 	endwin();
5007 	fprintf(stderr,
5008 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5009 	    getprogname());
5010 	exit(1);
5011 }
5012 
5013 struct tog_blame_line {
5014 	int annotated;
5015 	struct got_object_id *id;
5016 };
5017 
5018 static const struct got_error *
5019 draw_blame(struct tog_view *view)
5020 {
5021 	struct tog_blame_view_state *s = &view->state.blame;
5022 	struct tog_blame *blame = &s->blame;
5023 	regmatch_t *regmatch = &view->regmatch;
5024 	const struct got_error *err;
5025 	int lineno = 0, nprinted = 0;
5026 	char *line = NULL;
5027 	size_t linesize = 0;
5028 	ssize_t linelen;
5029 	wchar_t *wline;
5030 	int width;
5031 	struct tog_blame_line *blame_line;
5032 	struct got_object_id *prev_id = NULL;
5033 	char *id_str;
5034 	struct tog_color *tc;
5035 
5036 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5037 	if (err)
5038 		return err;
5039 
5040 	rewind(blame->f);
5041 	werase(view->window);
5042 
5043 	if (asprintf(&line, "commit %s", id_str) == -1) {
5044 		err = got_error_from_errno("asprintf");
5045 		free(id_str);
5046 		return err;
5047 	}
5048 
5049 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5050 	free(line);
5051 	line = NULL;
5052 	if (err)
5053 		return err;
5054 	if (view_needs_focus_indication(view))
5055 		wstandout(view->window);
5056 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5057 	if (tc)
5058 		wattr_on(view->window,
5059 		    COLOR_PAIR(tc->colorpair), NULL);
5060 	waddwstr(view->window, wline);
5061 	if (tc)
5062 		wattr_off(view->window,
5063 		    COLOR_PAIR(tc->colorpair), NULL);
5064 	if (view_needs_focus_indication(view))
5065 		wstandend(view->window);
5066 	free(wline);
5067 	wline = NULL;
5068 	if (width < view->ncols - 1)
5069 		waddch(view->window, '\n');
5070 
5071 	if (asprintf(&line, "[%d/%d] %s%s",
5072 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5073 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5074 		free(id_str);
5075 		return got_error_from_errno("asprintf");
5076 	}
5077 	free(id_str);
5078 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5079 	free(line);
5080 	line = NULL;
5081 	if (err)
5082 		return err;
5083 	waddwstr(view->window, wline);
5084 	free(wline);
5085 	wline = NULL;
5086 	if (width < view->ncols - 1)
5087 		waddch(view->window, '\n');
5088 
5089 	s->eof = 0;
5090 	view->maxx = 0;
5091 	while (nprinted < view->nlines - 2) {
5092 		linelen = getline(&line, &linesize, blame->f);
5093 		if (linelen == -1) {
5094 			if (feof(blame->f)) {
5095 				s->eof = 1;
5096 				break;
5097 			}
5098 			free(line);
5099 			return got_ferror(blame->f, GOT_ERR_IO);
5100 		}
5101 		if (++lineno < s->first_displayed_line)
5102 			continue;
5103 
5104 		/* Set view->maxx based on full line length. */
5105 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5106 		if (err) {
5107 			free(line);
5108 			return err;
5109 		}
5110 		free(wline);
5111 		wline = NULL;
5112 		view->maxx = MAX(view->maxx, width);
5113 
5114 		if (nprinted == s->selected_line - 1)
5115 			wstandout(view->window);
5116 
5117 		if (blame->nlines > 0) {
5118 			blame_line = &blame->lines[lineno - 1];
5119 			if (blame_line->annotated && prev_id &&
5120 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5121 			    !(nprinted == s->selected_line - 1)) {
5122 				waddstr(view->window, "        ");
5123 			} else if (blame_line->annotated) {
5124 				char *id_str;
5125 				err = got_object_id_str(&id_str,
5126 				    blame_line->id);
5127 				if (err) {
5128 					free(line);
5129 					return err;
5130 				}
5131 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5132 				if (tc)
5133 					wattr_on(view->window,
5134 					    COLOR_PAIR(tc->colorpair), NULL);
5135 				wprintw(view->window, "%.8s", id_str);
5136 				if (tc)
5137 					wattr_off(view->window,
5138 					    COLOR_PAIR(tc->colorpair), NULL);
5139 				free(id_str);
5140 				prev_id = blame_line->id;
5141 			} else {
5142 				waddstr(view->window, "........");
5143 				prev_id = NULL;
5144 			}
5145 		} else {
5146 			waddstr(view->window, "........");
5147 			prev_id = NULL;
5148 		}
5149 
5150 		if (nprinted == s->selected_line - 1)
5151 			wstandend(view->window);
5152 		waddstr(view->window, " ");
5153 
5154 		if (view->ncols <= 9) {
5155 			width = 9;
5156 		} else if (s->first_displayed_line + nprinted ==
5157 		    s->matched_line &&
5158 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5159 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5160 			    view->window, view->x, regmatch);
5161 			if (err) {
5162 				free(line);
5163 				return err;
5164 			}
5165 			width += 9;
5166 		} else {
5167 			int skip;
5168 			err = format_line(&wline, &width, &skip, line,
5169 			    view->x, view->ncols - 9, 9, 1);
5170 			if (err) {
5171 				free(line);
5172 				return err;
5173 			}
5174 			waddwstr(view->window, &wline[skip]);
5175 			width += 9;
5176 			free(wline);
5177 			wline = NULL;
5178 		}
5179 
5180 		if (width <= view->ncols - 1)
5181 			waddch(view->window, '\n');
5182 		if (++nprinted == 1)
5183 			s->first_displayed_line = lineno;
5184 	}
5185 	free(line);
5186 	s->last_displayed_line = lineno;
5187 
5188 	view_border(view);
5189 
5190 	return NULL;
5191 }
5192 
5193 static const struct got_error *
5194 blame_cb(void *arg, int nlines, int lineno,
5195     struct got_commit_object *commit, struct got_object_id *id)
5196 {
5197 	const struct got_error *err = NULL;
5198 	struct tog_blame_cb_args *a = arg;
5199 	struct tog_blame_line *line;
5200 	int errcode;
5201 
5202 	if (nlines != a->nlines ||
5203 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5204 		return got_error(GOT_ERR_RANGE);
5205 
5206 	errcode = pthread_mutex_lock(&tog_mutex);
5207 	if (errcode)
5208 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5209 
5210 	if (*a->quit) {	/* user has quit the blame view */
5211 		err = got_error(GOT_ERR_ITER_COMPLETED);
5212 		goto done;
5213 	}
5214 
5215 	if (lineno == -1)
5216 		goto done; /* no change in this commit */
5217 
5218 	line = &a->lines[lineno - 1];
5219 	if (line->annotated)
5220 		goto done;
5221 
5222 	line->id = got_object_id_dup(id);
5223 	if (line->id == NULL) {
5224 		err = got_error_from_errno("got_object_id_dup");
5225 		goto done;
5226 	}
5227 	line->annotated = 1;
5228 done:
5229 	errcode = pthread_mutex_unlock(&tog_mutex);
5230 	if (errcode)
5231 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5232 	return err;
5233 }
5234 
5235 static void *
5236 blame_thread(void *arg)
5237 {
5238 	const struct got_error *err, *close_err;
5239 	struct tog_blame_thread_args *ta = arg;
5240 	struct tog_blame_cb_args *a = ta->cb_args;
5241 	int errcode, fd1 = -1, fd2 = -1;
5242 	FILE *f1 = NULL, *f2 = NULL;
5243 
5244 	fd1 = got_opentempfd();
5245 	if (fd1 == -1)
5246 		return (void *)got_error_from_errno("got_opentempfd");
5247 
5248 	fd2 = got_opentempfd();
5249 	if (fd2 == -1) {
5250 		err = got_error_from_errno("got_opentempfd");
5251 		goto done;
5252 	}
5253 
5254 	f1 = got_opentemp();
5255 	if (f1 == NULL) {
5256 		err = (void *)got_error_from_errno("got_opentemp");
5257 		goto done;
5258 	}
5259 	f2 = got_opentemp();
5260 	if (f2 == NULL) {
5261 		err = (void *)got_error_from_errno("got_opentemp");
5262 		goto done;
5263 	}
5264 
5265 	err = block_signals_used_by_main_thread();
5266 	if (err)
5267 		goto done;
5268 
5269 	err = got_blame(ta->path, a->commit_id, ta->repo,
5270 	    tog_diff_algo, blame_cb, ta->cb_args,
5271 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5272 	if (err && err->code == GOT_ERR_CANCELLED)
5273 		err = NULL;
5274 
5275 	errcode = pthread_mutex_lock(&tog_mutex);
5276 	if (errcode) {
5277 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5278 		goto done;
5279 	}
5280 
5281 	close_err = got_repo_close(ta->repo);
5282 	if (err == NULL)
5283 		err = close_err;
5284 	ta->repo = NULL;
5285 	*ta->complete = 1;
5286 
5287 	errcode = pthread_mutex_unlock(&tog_mutex);
5288 	if (errcode && err == NULL)
5289 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5290 
5291 done:
5292 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5293 		err = got_error_from_errno("close");
5294 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5295 		err = got_error_from_errno("close");
5296 	if (f1 && fclose(f1) == EOF && err == NULL)
5297 		err = got_error_from_errno("fclose");
5298 	if (f2 && fclose(f2) == EOF && err == NULL)
5299 		err = got_error_from_errno("fclose");
5300 
5301 	return (void *)err;
5302 }
5303 
5304 static struct got_object_id *
5305 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5306     int first_displayed_line, int selected_line)
5307 {
5308 	struct tog_blame_line *line;
5309 
5310 	if (nlines <= 0)
5311 		return NULL;
5312 
5313 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5314 	if (!line->annotated)
5315 		return NULL;
5316 
5317 	return line->id;
5318 }
5319 
5320 static struct got_object_id *
5321 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5322     int lineno)
5323 {
5324 	struct tog_blame_line *line;
5325 
5326 	if (nlines <= 0 || lineno >= nlines)
5327 		return NULL;
5328 
5329 	line = &lines[lineno - 1];
5330 	if (!line->annotated)
5331 		return NULL;
5332 
5333 	return line->id;
5334 }
5335 
5336 static const struct got_error *
5337 stop_blame(struct tog_blame *blame)
5338 {
5339 	const struct got_error *err = NULL;
5340 	int i;
5341 
5342 	if (blame->thread) {
5343 		int errcode;
5344 		errcode = pthread_mutex_unlock(&tog_mutex);
5345 		if (errcode)
5346 			return got_error_set_errno(errcode,
5347 			    "pthread_mutex_unlock");
5348 		errcode = pthread_join(blame->thread, (void **)&err);
5349 		if (errcode)
5350 			return got_error_set_errno(errcode, "pthread_join");
5351 		errcode = pthread_mutex_lock(&tog_mutex);
5352 		if (errcode)
5353 			return got_error_set_errno(errcode,
5354 			    "pthread_mutex_lock");
5355 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5356 			err = NULL;
5357 		blame->thread = NULL;
5358 	}
5359 	if (blame->thread_args.repo) {
5360 		const struct got_error *close_err;
5361 		close_err = got_repo_close(blame->thread_args.repo);
5362 		if (err == NULL)
5363 			err = close_err;
5364 		blame->thread_args.repo = NULL;
5365 	}
5366 	if (blame->f) {
5367 		if (fclose(blame->f) == EOF && err == NULL)
5368 			err = got_error_from_errno("fclose");
5369 		blame->f = NULL;
5370 	}
5371 	if (blame->lines) {
5372 		for (i = 0; i < blame->nlines; i++)
5373 			free(blame->lines[i].id);
5374 		free(blame->lines);
5375 		blame->lines = NULL;
5376 	}
5377 	free(blame->cb_args.commit_id);
5378 	blame->cb_args.commit_id = NULL;
5379 	if (blame->pack_fds) {
5380 		const struct got_error *pack_err =
5381 		    got_repo_pack_fds_close(blame->pack_fds);
5382 		if (err == NULL)
5383 			err = pack_err;
5384 		blame->pack_fds = NULL;
5385 	}
5386 	return err;
5387 }
5388 
5389 static const struct got_error *
5390 cancel_blame_view(void *arg)
5391 {
5392 	const struct got_error *err = NULL;
5393 	int *done = arg;
5394 	int errcode;
5395 
5396 	errcode = pthread_mutex_lock(&tog_mutex);
5397 	if (errcode)
5398 		return got_error_set_errno(errcode,
5399 		    "pthread_mutex_unlock");
5400 
5401 	if (*done)
5402 		err = got_error(GOT_ERR_CANCELLED);
5403 
5404 	errcode = pthread_mutex_unlock(&tog_mutex);
5405 	if (errcode)
5406 		return got_error_set_errno(errcode,
5407 		    "pthread_mutex_lock");
5408 
5409 	return err;
5410 }
5411 
5412 static const struct got_error *
5413 run_blame(struct tog_view *view)
5414 {
5415 	struct tog_blame_view_state *s = &view->state.blame;
5416 	struct tog_blame *blame = &s->blame;
5417 	const struct got_error *err = NULL;
5418 	struct got_commit_object *commit = NULL;
5419 	struct got_blob_object *blob = NULL;
5420 	struct got_repository *thread_repo = NULL;
5421 	struct got_object_id *obj_id = NULL;
5422 	int obj_type, fd = -1;
5423 	int *pack_fds = NULL;
5424 
5425 	err = got_object_open_as_commit(&commit, s->repo,
5426 	    &s->blamed_commit->id);
5427 	if (err)
5428 		return err;
5429 
5430 	fd = got_opentempfd();
5431 	if (fd == -1) {
5432 		err = got_error_from_errno("got_opentempfd");
5433 		goto done;
5434 	}
5435 
5436 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5437 	if (err)
5438 		goto done;
5439 
5440 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5441 	if (err)
5442 		goto done;
5443 
5444 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5445 		err = got_error(GOT_ERR_OBJ_TYPE);
5446 		goto done;
5447 	}
5448 
5449 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5450 	if (err)
5451 		goto done;
5452 	blame->f = got_opentemp();
5453 	if (blame->f == NULL) {
5454 		err = got_error_from_errno("got_opentemp");
5455 		goto done;
5456 	}
5457 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5458 	    &blame->line_offsets, blame->f, blob);
5459 	if (err)
5460 		goto done;
5461 	if (blame->nlines == 0) {
5462 		s->blame_complete = 1;
5463 		goto done;
5464 	}
5465 
5466 	/* Don't include \n at EOF in the blame line count. */
5467 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5468 		blame->nlines--;
5469 
5470 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5471 	if (blame->lines == NULL) {
5472 		err = got_error_from_errno("calloc");
5473 		goto done;
5474 	}
5475 
5476 	err = got_repo_pack_fds_open(&pack_fds);
5477 	if (err)
5478 		goto done;
5479 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5480 	    pack_fds);
5481 	if (err)
5482 		goto done;
5483 
5484 	blame->pack_fds = pack_fds;
5485 	blame->cb_args.view = view;
5486 	blame->cb_args.lines = blame->lines;
5487 	blame->cb_args.nlines = blame->nlines;
5488 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5489 	if (blame->cb_args.commit_id == NULL) {
5490 		err = got_error_from_errno("got_object_id_dup");
5491 		goto done;
5492 	}
5493 	blame->cb_args.quit = &s->done;
5494 
5495 	blame->thread_args.path = s->path;
5496 	blame->thread_args.repo = thread_repo;
5497 	blame->thread_args.cb_args = &blame->cb_args;
5498 	blame->thread_args.complete = &s->blame_complete;
5499 	blame->thread_args.cancel_cb = cancel_blame_view;
5500 	blame->thread_args.cancel_arg = &s->done;
5501 	s->blame_complete = 0;
5502 
5503 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5504 		s->first_displayed_line = 1;
5505 		s->last_displayed_line = view->nlines;
5506 		s->selected_line = 1;
5507 	}
5508 	s->matched_line = 0;
5509 
5510 done:
5511 	if (commit)
5512 		got_object_commit_close(commit);
5513 	if (fd != -1 && close(fd) == -1 && err == NULL)
5514 		err = got_error_from_errno("close");
5515 	if (blob)
5516 		got_object_blob_close(blob);
5517 	free(obj_id);
5518 	if (err)
5519 		stop_blame(blame);
5520 	return err;
5521 }
5522 
5523 static const struct got_error *
5524 open_blame_view(struct tog_view *view, char *path,
5525     struct got_object_id *commit_id, struct got_repository *repo)
5526 {
5527 	const struct got_error *err = NULL;
5528 	struct tog_blame_view_state *s = &view->state.blame;
5529 
5530 	STAILQ_INIT(&s->blamed_commits);
5531 
5532 	s->path = strdup(path);
5533 	if (s->path == NULL)
5534 		return got_error_from_errno("strdup");
5535 
5536 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5537 	if (err) {
5538 		free(s->path);
5539 		return err;
5540 	}
5541 
5542 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5543 	s->first_displayed_line = 1;
5544 	s->last_displayed_line = view->nlines;
5545 	s->selected_line = 1;
5546 	s->blame_complete = 0;
5547 	s->repo = repo;
5548 	s->commit_id = commit_id;
5549 	memset(&s->blame, 0, sizeof(s->blame));
5550 
5551 	STAILQ_INIT(&s->colors);
5552 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5553 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5554 		    get_color_value("TOG_COLOR_COMMIT"));
5555 		if (err)
5556 			return err;
5557 	}
5558 
5559 	view->show = show_blame_view;
5560 	view->input = input_blame_view;
5561 	view->reset = reset_blame_view;
5562 	view->close = close_blame_view;
5563 	view->search_start = search_start_blame_view;
5564 	view->search_next = search_next_blame_view;
5565 
5566 	return run_blame(view);
5567 }
5568 
5569 static const struct got_error *
5570 close_blame_view(struct tog_view *view)
5571 {
5572 	const struct got_error *err = NULL;
5573 	struct tog_blame_view_state *s = &view->state.blame;
5574 
5575 	if (s->blame.thread)
5576 		err = stop_blame(&s->blame);
5577 
5578 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5579 		struct got_object_qid *blamed_commit;
5580 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5581 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5582 		got_object_qid_free(blamed_commit);
5583 	}
5584 
5585 	free(s->path);
5586 	free_colors(&s->colors);
5587 	return err;
5588 }
5589 
5590 static const struct got_error *
5591 search_start_blame_view(struct tog_view *view)
5592 {
5593 	struct tog_blame_view_state *s = &view->state.blame;
5594 
5595 	s->matched_line = 0;
5596 	return NULL;
5597 }
5598 
5599 static const struct got_error *
5600 search_next_blame_view(struct tog_view *view)
5601 {
5602 	struct tog_blame_view_state *s = &view->state.blame;
5603 	const struct got_error *err = NULL;
5604 	int lineno;
5605 	char *line = NULL;
5606 	size_t linesize = 0;
5607 	ssize_t linelen;
5608 
5609 	if (!view->searching) {
5610 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5611 		return NULL;
5612 	}
5613 
5614 	if (s->matched_line) {
5615 		if (view->searching == TOG_SEARCH_FORWARD)
5616 			lineno = s->matched_line + 1;
5617 		else
5618 			lineno = s->matched_line - 1;
5619 	} else
5620 		lineno = s->first_displayed_line - 1 + s->selected_line;
5621 
5622 	while (1) {
5623 		off_t offset;
5624 
5625 		if (lineno <= 0 || lineno > s->blame.nlines) {
5626 			if (s->matched_line == 0) {
5627 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5628 				break;
5629 			}
5630 
5631 			if (view->searching == TOG_SEARCH_FORWARD)
5632 				lineno = 1;
5633 			else
5634 				lineno = s->blame.nlines;
5635 		}
5636 
5637 		offset = s->blame.line_offsets[lineno - 1];
5638 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5639 			free(line);
5640 			return got_error_from_errno("fseeko");
5641 		}
5642 		linelen = getline(&line, &linesize, s->blame.f);
5643 		if (linelen != -1) {
5644 			char *exstr;
5645 			err = expand_tab(&exstr, line);
5646 			if (err)
5647 				break;
5648 			if (match_line(exstr, &view->regex, 1,
5649 			    &view->regmatch)) {
5650 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5651 				s->matched_line = lineno;
5652 				free(exstr);
5653 				break;
5654 			}
5655 			free(exstr);
5656 		}
5657 		if (view->searching == TOG_SEARCH_FORWARD)
5658 			lineno++;
5659 		else
5660 			lineno--;
5661 	}
5662 	free(line);
5663 
5664 	if (s->matched_line) {
5665 		s->first_displayed_line = s->matched_line;
5666 		s->selected_line = 1;
5667 	}
5668 
5669 	return err;
5670 }
5671 
5672 static const struct got_error *
5673 show_blame_view(struct tog_view *view)
5674 {
5675 	const struct got_error *err = NULL;
5676 	struct tog_blame_view_state *s = &view->state.blame;
5677 	int errcode;
5678 
5679 	if (s->blame.thread == NULL && !s->blame_complete) {
5680 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5681 		    &s->blame.thread_args);
5682 		if (errcode)
5683 			return got_error_set_errno(errcode, "pthread_create");
5684 
5685 		halfdelay(1); /* fast refresh while annotating  */
5686 	}
5687 
5688 	if (s->blame_complete)
5689 		halfdelay(10); /* disable fast refresh */
5690 
5691 	err = draw_blame(view);
5692 
5693 	view_border(view);
5694 	return err;
5695 }
5696 
5697 static const struct got_error *
5698 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5699 {
5700 	const struct got_error *err = NULL, *thread_err = NULL;
5701 	struct tog_view *diff_view;
5702 	struct tog_blame_view_state *s = &view->state.blame;
5703 	int eos, nscroll, begin_y = 0, begin_x = 0;
5704 
5705 	eos = nscroll = view->nlines - 2;
5706 	if (view_is_hsplit_top(view))
5707 		--eos;  /* border */
5708 
5709 	switch (ch) {
5710 	case '0':
5711 		view->x = 0;
5712 		break;
5713 	case '$':
5714 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5715 		view->count = 0;
5716 		break;
5717 	case KEY_RIGHT:
5718 	case 'l':
5719 		if (view->x + view->ncols / 3 < view->maxx)
5720 			view->x += 2;  /* move two columns right */
5721 		else
5722 			view->count = 0;
5723 		break;
5724 	case KEY_LEFT:
5725 	case 'h':
5726 		view->x -= MIN(view->x, 2);  /* move two columns back */
5727 		if (view->x <= 0)
5728 			view->count = 0;
5729 		break;
5730 	case 'q':
5731 		s->done = 1;
5732 		break;
5733 	case 'g':
5734 	case KEY_HOME:
5735 		s->selected_line = 1;
5736 		s->first_displayed_line = 1;
5737 		view->count = 0;
5738 		break;
5739 	case 'G':
5740 	case KEY_END:
5741 		if (s->blame.nlines < eos) {
5742 			s->selected_line = s->blame.nlines;
5743 			s->first_displayed_line = 1;
5744 		} else {
5745 			s->selected_line = eos;
5746 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5747 		}
5748 		view->count = 0;
5749 		break;
5750 	case 'k':
5751 	case KEY_UP:
5752 	case CTRL('p'):
5753 		if (s->selected_line > 1)
5754 			s->selected_line--;
5755 		else if (s->selected_line == 1 &&
5756 		    s->first_displayed_line > 1)
5757 			s->first_displayed_line--;
5758 		else
5759 			view->count = 0;
5760 		break;
5761 	case CTRL('u'):
5762 	case 'u':
5763 		nscroll /= 2;
5764 		/* FALL THROUGH */
5765 	case KEY_PPAGE:
5766 	case CTRL('b'):
5767 	case 'b':
5768 		if (s->first_displayed_line == 1) {
5769 			if (view->count > 1)
5770 				nscroll += nscroll;
5771 			s->selected_line = MAX(1, s->selected_line - nscroll);
5772 			view->count = 0;
5773 			break;
5774 		}
5775 		if (s->first_displayed_line > nscroll)
5776 			s->first_displayed_line -= nscroll;
5777 		else
5778 			s->first_displayed_line = 1;
5779 		break;
5780 	case 'j':
5781 	case KEY_DOWN:
5782 	case CTRL('n'):
5783 		if (s->selected_line < eos && s->first_displayed_line +
5784 		    s->selected_line <= s->blame.nlines)
5785 			s->selected_line++;
5786 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5787 			s->first_displayed_line++;
5788 		else
5789 			view->count = 0;
5790 		break;
5791 	case 'c':
5792 	case 'p': {
5793 		struct got_object_id *id = NULL;
5794 
5795 		view->count = 0;
5796 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5797 		    s->first_displayed_line, s->selected_line);
5798 		if (id == NULL)
5799 			break;
5800 		if (ch == 'p') {
5801 			struct got_commit_object *commit, *pcommit;
5802 			struct got_object_qid *pid;
5803 			struct got_object_id *blob_id = NULL;
5804 			int obj_type;
5805 			err = got_object_open_as_commit(&commit,
5806 			    s->repo, id);
5807 			if (err)
5808 				break;
5809 			pid = STAILQ_FIRST(
5810 			    got_object_commit_get_parent_ids(commit));
5811 			if (pid == NULL) {
5812 				got_object_commit_close(commit);
5813 				break;
5814 			}
5815 			/* Check if path history ends here. */
5816 			err = got_object_open_as_commit(&pcommit,
5817 			    s->repo, &pid->id);
5818 			if (err)
5819 				break;
5820 			err = got_object_id_by_path(&blob_id, s->repo,
5821 			    pcommit, s->path);
5822 			got_object_commit_close(pcommit);
5823 			if (err) {
5824 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5825 					err = NULL;
5826 				got_object_commit_close(commit);
5827 				break;
5828 			}
5829 			err = got_object_get_type(&obj_type, s->repo,
5830 			    blob_id);
5831 			free(blob_id);
5832 			/* Can't blame non-blob type objects. */
5833 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5834 				got_object_commit_close(commit);
5835 				break;
5836 			}
5837 			err = got_object_qid_alloc(&s->blamed_commit,
5838 			    &pid->id);
5839 			got_object_commit_close(commit);
5840 		} else {
5841 			if (got_object_id_cmp(id,
5842 			    &s->blamed_commit->id) == 0)
5843 				break;
5844 			err = got_object_qid_alloc(&s->blamed_commit,
5845 			    id);
5846 		}
5847 		if (err)
5848 			break;
5849 		s->done = 1;
5850 		thread_err = stop_blame(&s->blame);
5851 		s->done = 0;
5852 		if (thread_err)
5853 			break;
5854 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5855 		    s->blamed_commit, entry);
5856 		err = run_blame(view);
5857 		if (err)
5858 			break;
5859 		break;
5860 	}
5861 	case 'C': {
5862 		struct got_object_qid *first;
5863 
5864 		view->count = 0;
5865 		first = STAILQ_FIRST(&s->blamed_commits);
5866 		if (!got_object_id_cmp(&first->id, s->commit_id))
5867 			break;
5868 		s->done = 1;
5869 		thread_err = stop_blame(&s->blame);
5870 		s->done = 0;
5871 		if (thread_err)
5872 			break;
5873 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5874 		got_object_qid_free(s->blamed_commit);
5875 		s->blamed_commit =
5876 		    STAILQ_FIRST(&s->blamed_commits);
5877 		err = run_blame(view);
5878 		if (err)
5879 			break;
5880 		break;
5881 	}
5882 	case KEY_ENTER:
5883 	case '\r': {
5884 		struct got_object_id *id = NULL;
5885 		struct got_object_qid *pid;
5886 		struct got_commit_object *commit = NULL;
5887 
5888 		view->count = 0;
5889 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5890 		    s->first_displayed_line, s->selected_line);
5891 		if (id == NULL)
5892 			break;
5893 		err = got_object_open_as_commit(&commit, s->repo, id);
5894 		if (err)
5895 			break;
5896 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5897 		if (*new_view) {
5898 			/* traversed from diff view, release diff resources  */
5899 			err = close_diff_view(*new_view);
5900 			if (err)
5901 				break;
5902 			diff_view = *new_view;
5903 		} else {
5904 			if (view_is_parent_view(view))
5905 				view_get_split(view, &begin_y, &begin_x);
5906 
5907 			diff_view = view_open(0, 0, begin_y, begin_x,
5908 			    TOG_VIEW_DIFF);
5909 			if (diff_view == NULL) {
5910 				got_object_commit_close(commit);
5911 				err = got_error_from_errno("view_open");
5912 				break;
5913 			}
5914 		}
5915 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5916 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
5917 		got_object_commit_close(commit);
5918 		if (err) {
5919 			view_close(diff_view);
5920 			break;
5921 		}
5922 		s->last_diffed_line = s->first_displayed_line - 1 +
5923 		    s->selected_line;
5924 		if (*new_view)
5925 			break;	/* still open from active diff view */
5926 		if (view_is_parent_view(view) &&
5927 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5928 			err = view_init_hsplit(view, begin_y);
5929 			if (err)
5930 				break;
5931 		}
5932 
5933 		view->focussed = 0;
5934 		diff_view->focussed = 1;
5935 		diff_view->mode = view->mode;
5936 		diff_view->nlines = view->lines - begin_y;
5937 		if (view_is_parent_view(view)) {
5938 			view_transfer_size(diff_view, view);
5939 			err = view_close_child(view);
5940 			if (err)
5941 				break;
5942 			err = view_set_child(view, diff_view);
5943 			if (err)
5944 				break;
5945 			view->focus_child = 1;
5946 		} else
5947 			*new_view = diff_view;
5948 		if (err)
5949 			break;
5950 		break;
5951 	}
5952 	case CTRL('d'):
5953 	case 'd':
5954 		nscroll /= 2;
5955 		/* FALL THROUGH */
5956 	case KEY_NPAGE:
5957 	case CTRL('f'):
5958 	case 'f':
5959 	case ' ':
5960 		if (s->last_displayed_line >= s->blame.nlines &&
5961 		    s->selected_line >= MIN(s->blame.nlines,
5962 		    view->nlines - 2)) {
5963 			view->count = 0;
5964 			break;
5965 		}
5966 		if (s->last_displayed_line >= s->blame.nlines &&
5967 		    s->selected_line < view->nlines - 2) {
5968 			s->selected_line +=
5969 			    MIN(nscroll, s->last_displayed_line -
5970 			    s->first_displayed_line - s->selected_line + 1);
5971 		}
5972 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5973 			s->first_displayed_line += nscroll;
5974 		else
5975 			s->first_displayed_line =
5976 			    s->blame.nlines - (view->nlines - 3);
5977 		break;
5978 	case KEY_RESIZE:
5979 		if (s->selected_line > view->nlines - 2) {
5980 			s->selected_line = MIN(s->blame.nlines,
5981 			    view->nlines - 2);
5982 		}
5983 		break;
5984 	default:
5985 		view->count = 0;
5986 		break;
5987 	}
5988 	return thread_err ? thread_err : err;
5989 }
5990 
5991 static const struct got_error *
5992 reset_blame_view(struct tog_view *view)
5993 {
5994 	const struct got_error *err;
5995 	struct tog_blame_view_state *s = &view->state.blame;
5996 
5997 	view->count = 0;
5998 	s->done = 1;
5999 	err = stop_blame(&s->blame);
6000 	s->done = 0;
6001 	if (err)
6002 		return err;
6003 	return run_blame(view);
6004 }
6005 
6006 static const struct got_error *
6007 cmd_blame(int argc, char *argv[])
6008 {
6009 	const struct got_error *error;
6010 	struct got_repository *repo = NULL;
6011 	struct got_worktree *worktree = NULL;
6012 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6013 	char *link_target = NULL;
6014 	struct got_object_id *commit_id = NULL;
6015 	struct got_commit_object *commit = NULL;
6016 	char *commit_id_str = NULL;
6017 	int ch;
6018 	struct tog_view *view;
6019 	int *pack_fds = NULL;
6020 
6021 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6022 		switch (ch) {
6023 		case 'c':
6024 			commit_id_str = optarg;
6025 			break;
6026 		case 'r':
6027 			repo_path = realpath(optarg, NULL);
6028 			if (repo_path == NULL)
6029 				return got_error_from_errno2("realpath",
6030 				    optarg);
6031 			break;
6032 		default:
6033 			usage_blame();
6034 			/* NOTREACHED */
6035 		}
6036 	}
6037 
6038 	argc -= optind;
6039 	argv += optind;
6040 
6041 	if (argc != 1)
6042 		usage_blame();
6043 
6044 	error = got_repo_pack_fds_open(&pack_fds);
6045 	if (error != NULL)
6046 		goto done;
6047 
6048 	if (repo_path == NULL) {
6049 		cwd = getcwd(NULL, 0);
6050 		if (cwd == NULL)
6051 			return got_error_from_errno("getcwd");
6052 		error = got_worktree_open(&worktree, cwd);
6053 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6054 			goto done;
6055 		if (worktree)
6056 			repo_path =
6057 			    strdup(got_worktree_get_repo_path(worktree));
6058 		else
6059 			repo_path = strdup(cwd);
6060 		if (repo_path == NULL) {
6061 			error = got_error_from_errno("strdup");
6062 			goto done;
6063 		}
6064 	}
6065 
6066 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6067 	if (error != NULL)
6068 		goto done;
6069 
6070 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6071 	    worktree);
6072 	if (error)
6073 		goto done;
6074 
6075 	init_curses();
6076 
6077 	error = apply_unveil(got_repo_get_path(repo), NULL);
6078 	if (error)
6079 		goto done;
6080 
6081 	error = tog_load_refs(repo, 0);
6082 	if (error)
6083 		goto done;
6084 
6085 	if (commit_id_str == NULL) {
6086 		struct got_reference *head_ref;
6087 		error = got_ref_open(&head_ref, repo, worktree ?
6088 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6089 		if (error != NULL)
6090 			goto done;
6091 		error = got_ref_resolve(&commit_id, repo, head_ref);
6092 		got_ref_close(head_ref);
6093 	} else {
6094 		error = got_repo_match_object_id(&commit_id, NULL,
6095 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6096 	}
6097 	if (error != NULL)
6098 		goto done;
6099 
6100 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6101 	if (view == NULL) {
6102 		error = got_error_from_errno("view_open");
6103 		goto done;
6104 	}
6105 
6106 	error = got_object_open_as_commit(&commit, repo, commit_id);
6107 	if (error)
6108 		goto done;
6109 
6110 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6111 	    commit, repo);
6112 	if (error)
6113 		goto done;
6114 
6115 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6116 	    commit_id, repo);
6117 	if (error)
6118 		goto done;
6119 	if (worktree) {
6120 		/* Release work tree lock. */
6121 		got_worktree_close(worktree);
6122 		worktree = NULL;
6123 	}
6124 	error = view_loop(view);
6125 done:
6126 	free(repo_path);
6127 	free(in_repo_path);
6128 	free(link_target);
6129 	free(cwd);
6130 	free(commit_id);
6131 	if (commit)
6132 		got_object_commit_close(commit);
6133 	if (worktree)
6134 		got_worktree_close(worktree);
6135 	if (repo) {
6136 		const struct got_error *close_err = got_repo_close(repo);
6137 		if (error == NULL)
6138 			error = close_err;
6139 	}
6140 	if (pack_fds) {
6141 		const struct got_error *pack_err =
6142 		    got_repo_pack_fds_close(pack_fds);
6143 		if (error == NULL)
6144 			error = pack_err;
6145 	}
6146 	tog_free_refs();
6147 	return error;
6148 }
6149 
6150 static const struct got_error *
6151 draw_tree_entries(struct tog_view *view, const char *parent_path)
6152 {
6153 	struct tog_tree_view_state *s = &view->state.tree;
6154 	const struct got_error *err = NULL;
6155 	struct got_tree_entry *te;
6156 	wchar_t *wline;
6157 	struct tog_color *tc;
6158 	int width, n, i, nentries;
6159 	int limit = view->nlines;
6160 
6161 	s->ndisplayed = 0;
6162 	if (view_is_hsplit_top(view))
6163 		--limit;  /* border */
6164 
6165 	werase(view->window);
6166 
6167 	if (limit == 0)
6168 		return NULL;
6169 
6170 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6171 	    0, 0);
6172 	if (err)
6173 		return err;
6174 	if (view_needs_focus_indication(view))
6175 		wstandout(view->window);
6176 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6177 	if (tc)
6178 		wattr_on(view->window,
6179 		    COLOR_PAIR(tc->colorpair), NULL);
6180 	waddwstr(view->window, wline);
6181 	if (tc)
6182 		wattr_off(view->window,
6183 		    COLOR_PAIR(tc->colorpair), NULL);
6184 	if (view_needs_focus_indication(view))
6185 		wstandend(view->window);
6186 	free(wline);
6187 	wline = NULL;
6188 	if (width < view->ncols - 1)
6189 		waddch(view->window, '\n');
6190 	if (--limit <= 0)
6191 		return NULL;
6192 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6193 	    0, 0);
6194 	if (err)
6195 		return err;
6196 	waddwstr(view->window, wline);
6197 	free(wline);
6198 	wline = NULL;
6199 	if (width < view->ncols - 1)
6200 		waddch(view->window, '\n');
6201 	if (--limit <= 0)
6202 		return NULL;
6203 	waddch(view->window, '\n');
6204 	if (--limit <= 0)
6205 		return NULL;
6206 
6207 	if (s->first_displayed_entry == NULL) {
6208 		te = got_object_tree_get_first_entry(s->tree);
6209 		if (s->selected == 0) {
6210 			if (view->focussed)
6211 				wstandout(view->window);
6212 			s->selected_entry = NULL;
6213 		}
6214 		waddstr(view->window, "  ..\n");	/* parent directory */
6215 		if (s->selected == 0 && view->focussed)
6216 			wstandend(view->window);
6217 		s->ndisplayed++;
6218 		if (--limit <= 0)
6219 			return NULL;
6220 		n = 1;
6221 	} else {
6222 		n = 0;
6223 		te = s->first_displayed_entry;
6224 	}
6225 
6226 	nentries = got_object_tree_get_nentries(s->tree);
6227 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6228 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6229 		const char *modestr = "";
6230 		mode_t mode;
6231 
6232 		te = got_object_tree_get_entry(s->tree, i);
6233 		mode = got_tree_entry_get_mode(te);
6234 
6235 		if (s->show_ids) {
6236 			err = got_object_id_str(&id_str,
6237 			    got_tree_entry_get_id(te));
6238 			if (err)
6239 				return got_error_from_errno(
6240 				    "got_object_id_str");
6241 		}
6242 		if (got_object_tree_entry_is_submodule(te))
6243 			modestr = "$";
6244 		else if (S_ISLNK(mode)) {
6245 			int i;
6246 
6247 			err = got_tree_entry_get_symlink_target(&link_target,
6248 			    te, s->repo);
6249 			if (err) {
6250 				free(id_str);
6251 				return err;
6252 			}
6253 			for (i = 0; i < strlen(link_target); i++) {
6254 				if (!isprint((unsigned char)link_target[i]))
6255 					link_target[i] = '?';
6256 			}
6257 			modestr = "@";
6258 		}
6259 		else if (S_ISDIR(mode))
6260 			modestr = "/";
6261 		else if (mode & S_IXUSR)
6262 			modestr = "*";
6263 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6264 		    got_tree_entry_get_name(te), modestr,
6265 		    link_target ? " -> ": "",
6266 		    link_target ? link_target : "") == -1) {
6267 			free(id_str);
6268 			free(link_target);
6269 			return got_error_from_errno("asprintf");
6270 		}
6271 		free(id_str);
6272 		free(link_target);
6273 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6274 		    0, 0);
6275 		if (err) {
6276 			free(line);
6277 			break;
6278 		}
6279 		if (n == s->selected) {
6280 			if (view->focussed)
6281 				wstandout(view->window);
6282 			s->selected_entry = te;
6283 		}
6284 		tc = match_color(&s->colors, line);
6285 		if (tc)
6286 			wattr_on(view->window,
6287 			    COLOR_PAIR(tc->colorpair), NULL);
6288 		waddwstr(view->window, wline);
6289 		if (tc)
6290 			wattr_off(view->window,
6291 			    COLOR_PAIR(tc->colorpair), NULL);
6292 		if (width < view->ncols - 1)
6293 			waddch(view->window, '\n');
6294 		if (n == s->selected && view->focussed)
6295 			wstandend(view->window);
6296 		free(line);
6297 		free(wline);
6298 		wline = NULL;
6299 		n++;
6300 		s->ndisplayed++;
6301 		s->last_displayed_entry = te;
6302 		if (--limit <= 0)
6303 			break;
6304 	}
6305 
6306 	return err;
6307 }
6308 
6309 static void
6310 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6311 {
6312 	struct got_tree_entry *te;
6313 	int isroot = s->tree == s->root;
6314 	int i = 0;
6315 
6316 	if (s->first_displayed_entry == NULL)
6317 		return;
6318 
6319 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6320 	while (i++ < maxscroll) {
6321 		if (te == NULL) {
6322 			if (!isroot)
6323 				s->first_displayed_entry = NULL;
6324 			break;
6325 		}
6326 		s->first_displayed_entry = te;
6327 		te = got_tree_entry_get_prev(s->tree, te);
6328 	}
6329 }
6330 
6331 static const struct got_error *
6332 tree_scroll_down(struct tog_view *view, int maxscroll)
6333 {
6334 	struct tog_tree_view_state *s = &view->state.tree;
6335 	struct got_tree_entry *next, *last;
6336 	int n = 0;
6337 
6338 	if (s->first_displayed_entry)
6339 		next = got_tree_entry_get_next(s->tree,
6340 		    s->first_displayed_entry);
6341 	else
6342 		next = got_object_tree_get_first_entry(s->tree);
6343 
6344 	last = s->last_displayed_entry;
6345 	while (next && n++ < maxscroll) {
6346 		if (last)
6347 			last = got_tree_entry_get_next(s->tree, last);
6348 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6349 			s->first_displayed_entry = next;
6350 			next = got_tree_entry_get_next(s->tree, next);
6351 		}
6352 	}
6353 
6354 	return NULL;
6355 }
6356 
6357 static const struct got_error *
6358 tree_entry_path(char **path, struct tog_parent_trees *parents,
6359     struct got_tree_entry *te)
6360 {
6361 	const struct got_error *err = NULL;
6362 	struct tog_parent_tree *pt;
6363 	size_t len = 2; /* for leading slash and NUL */
6364 
6365 	TAILQ_FOREACH(pt, parents, entry)
6366 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6367 		    + 1 /* slash */;
6368 	if (te)
6369 		len += strlen(got_tree_entry_get_name(te));
6370 
6371 	*path = calloc(1, len);
6372 	if (path == NULL)
6373 		return got_error_from_errno("calloc");
6374 
6375 	(*path)[0] = '/';
6376 	pt = TAILQ_LAST(parents, tog_parent_trees);
6377 	while (pt) {
6378 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6379 		if (strlcat(*path, name, len) >= len) {
6380 			err = got_error(GOT_ERR_NO_SPACE);
6381 			goto done;
6382 		}
6383 		if (strlcat(*path, "/", len) >= len) {
6384 			err = got_error(GOT_ERR_NO_SPACE);
6385 			goto done;
6386 		}
6387 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6388 	}
6389 	if (te) {
6390 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6391 			err = got_error(GOT_ERR_NO_SPACE);
6392 			goto done;
6393 		}
6394 	}
6395 done:
6396 	if (err) {
6397 		free(*path);
6398 		*path = NULL;
6399 	}
6400 	return err;
6401 }
6402 
6403 static const struct got_error *
6404 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6405     struct got_tree_entry *te, struct tog_parent_trees *parents,
6406     struct got_object_id *commit_id, struct got_repository *repo)
6407 {
6408 	const struct got_error *err = NULL;
6409 	char *path;
6410 	struct tog_view *blame_view;
6411 
6412 	*new_view = NULL;
6413 
6414 	err = tree_entry_path(&path, parents, te);
6415 	if (err)
6416 		return err;
6417 
6418 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6419 	if (blame_view == NULL) {
6420 		err = got_error_from_errno("view_open");
6421 		goto done;
6422 	}
6423 
6424 	err = open_blame_view(blame_view, path, commit_id, repo);
6425 	if (err) {
6426 		if (err->code == GOT_ERR_CANCELLED)
6427 			err = NULL;
6428 		view_close(blame_view);
6429 	} else
6430 		*new_view = blame_view;
6431 done:
6432 	free(path);
6433 	return err;
6434 }
6435 
6436 static const struct got_error *
6437 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6438     struct tog_tree_view_state *s)
6439 {
6440 	struct tog_view *log_view;
6441 	const struct got_error *err = NULL;
6442 	char *path;
6443 
6444 	*new_view = NULL;
6445 
6446 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6447 	if (log_view == NULL)
6448 		return got_error_from_errno("view_open");
6449 
6450 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6451 	if (err)
6452 		return err;
6453 
6454 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6455 	    path, 0);
6456 	if (err)
6457 		view_close(log_view);
6458 	else
6459 		*new_view = log_view;
6460 	free(path);
6461 	return err;
6462 }
6463 
6464 static const struct got_error *
6465 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6466     const char *head_ref_name, struct got_repository *repo)
6467 {
6468 	const struct got_error *err = NULL;
6469 	char *commit_id_str = NULL;
6470 	struct tog_tree_view_state *s = &view->state.tree;
6471 	struct got_commit_object *commit = NULL;
6472 
6473 	TAILQ_INIT(&s->parents);
6474 	STAILQ_INIT(&s->colors);
6475 
6476 	s->commit_id = got_object_id_dup(commit_id);
6477 	if (s->commit_id == NULL)
6478 		return got_error_from_errno("got_object_id_dup");
6479 
6480 	err = got_object_open_as_commit(&commit, repo, commit_id);
6481 	if (err)
6482 		goto done;
6483 
6484 	/*
6485 	 * The root is opened here and will be closed when the view is closed.
6486 	 * Any visited subtrees and their path-wise parents are opened and
6487 	 * closed on demand.
6488 	 */
6489 	err = got_object_open_as_tree(&s->root, repo,
6490 	    got_object_commit_get_tree_id(commit));
6491 	if (err)
6492 		goto done;
6493 	s->tree = s->root;
6494 
6495 	err = got_object_id_str(&commit_id_str, commit_id);
6496 	if (err != NULL)
6497 		goto done;
6498 
6499 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6500 		err = got_error_from_errno("asprintf");
6501 		goto done;
6502 	}
6503 
6504 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6505 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6506 	if (head_ref_name) {
6507 		s->head_ref_name = strdup(head_ref_name);
6508 		if (s->head_ref_name == NULL) {
6509 			err = got_error_from_errno("strdup");
6510 			goto done;
6511 		}
6512 	}
6513 	s->repo = repo;
6514 
6515 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6516 		err = add_color(&s->colors, "\\$$",
6517 		    TOG_COLOR_TREE_SUBMODULE,
6518 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6519 		if (err)
6520 			goto done;
6521 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6522 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6523 		if (err)
6524 			goto done;
6525 		err = add_color(&s->colors, "/$",
6526 		    TOG_COLOR_TREE_DIRECTORY,
6527 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6528 		if (err)
6529 			goto done;
6530 
6531 		err = add_color(&s->colors, "\\*$",
6532 		    TOG_COLOR_TREE_EXECUTABLE,
6533 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6534 		if (err)
6535 			goto done;
6536 
6537 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6538 		    get_color_value("TOG_COLOR_COMMIT"));
6539 		if (err)
6540 			goto done;
6541 	}
6542 
6543 	view->show = show_tree_view;
6544 	view->input = input_tree_view;
6545 	view->close = close_tree_view;
6546 	view->search_start = search_start_tree_view;
6547 	view->search_next = search_next_tree_view;
6548 done:
6549 	free(commit_id_str);
6550 	if (commit)
6551 		got_object_commit_close(commit);
6552 	if (err)
6553 		close_tree_view(view);
6554 	return err;
6555 }
6556 
6557 static const struct got_error *
6558 close_tree_view(struct tog_view *view)
6559 {
6560 	struct tog_tree_view_state *s = &view->state.tree;
6561 
6562 	free_colors(&s->colors);
6563 	free(s->tree_label);
6564 	s->tree_label = NULL;
6565 	free(s->commit_id);
6566 	s->commit_id = NULL;
6567 	free(s->head_ref_name);
6568 	s->head_ref_name = NULL;
6569 	while (!TAILQ_EMPTY(&s->parents)) {
6570 		struct tog_parent_tree *parent;
6571 		parent = TAILQ_FIRST(&s->parents);
6572 		TAILQ_REMOVE(&s->parents, parent, entry);
6573 		if (parent->tree != s->root)
6574 			got_object_tree_close(parent->tree);
6575 		free(parent);
6576 
6577 	}
6578 	if (s->tree != NULL && s->tree != s->root)
6579 		got_object_tree_close(s->tree);
6580 	if (s->root)
6581 		got_object_tree_close(s->root);
6582 	return NULL;
6583 }
6584 
6585 static const struct got_error *
6586 search_start_tree_view(struct tog_view *view)
6587 {
6588 	struct tog_tree_view_state *s = &view->state.tree;
6589 
6590 	s->matched_entry = NULL;
6591 	return NULL;
6592 }
6593 
6594 static int
6595 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6596 {
6597 	regmatch_t regmatch;
6598 
6599 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6600 	    0) == 0;
6601 }
6602 
6603 static const struct got_error *
6604 search_next_tree_view(struct tog_view *view)
6605 {
6606 	struct tog_tree_view_state *s = &view->state.tree;
6607 	struct got_tree_entry *te = NULL;
6608 
6609 	if (!view->searching) {
6610 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6611 		return NULL;
6612 	}
6613 
6614 	if (s->matched_entry) {
6615 		if (view->searching == TOG_SEARCH_FORWARD) {
6616 			if (s->selected_entry)
6617 				te = got_tree_entry_get_next(s->tree,
6618 				    s->selected_entry);
6619 			else
6620 				te = got_object_tree_get_first_entry(s->tree);
6621 		} else {
6622 			if (s->selected_entry == NULL)
6623 				te = got_object_tree_get_last_entry(s->tree);
6624 			else
6625 				te = got_tree_entry_get_prev(s->tree,
6626 				    s->selected_entry);
6627 		}
6628 	} else {
6629 		if (s->selected_entry)
6630 			te = s->selected_entry;
6631 		else if (view->searching == TOG_SEARCH_FORWARD)
6632 			te = got_object_tree_get_first_entry(s->tree);
6633 		else
6634 			te = got_object_tree_get_last_entry(s->tree);
6635 	}
6636 
6637 	while (1) {
6638 		if (te == NULL) {
6639 			if (s->matched_entry == NULL) {
6640 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6641 				return NULL;
6642 			}
6643 			if (view->searching == TOG_SEARCH_FORWARD)
6644 				te = got_object_tree_get_first_entry(s->tree);
6645 			else
6646 				te = got_object_tree_get_last_entry(s->tree);
6647 		}
6648 
6649 		if (match_tree_entry(te, &view->regex)) {
6650 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6651 			s->matched_entry = te;
6652 			break;
6653 		}
6654 
6655 		if (view->searching == TOG_SEARCH_FORWARD)
6656 			te = got_tree_entry_get_next(s->tree, te);
6657 		else
6658 			te = got_tree_entry_get_prev(s->tree, te);
6659 	}
6660 
6661 	if (s->matched_entry) {
6662 		s->first_displayed_entry = s->matched_entry;
6663 		s->selected = 0;
6664 	}
6665 
6666 	return NULL;
6667 }
6668 
6669 static const struct got_error *
6670 show_tree_view(struct tog_view *view)
6671 {
6672 	const struct got_error *err = NULL;
6673 	struct tog_tree_view_state *s = &view->state.tree;
6674 	char *parent_path;
6675 
6676 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6677 	if (err)
6678 		return err;
6679 
6680 	err = draw_tree_entries(view, parent_path);
6681 	free(parent_path);
6682 
6683 	view_border(view);
6684 	return err;
6685 }
6686 
6687 static const struct got_error *
6688 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6689 {
6690 	const struct got_error *err = NULL;
6691 	struct tog_tree_view_state *s = &view->state.tree;
6692 	struct tog_view *log_view, *ref_view;
6693 	struct got_tree_entry *te;
6694 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6695 
6696 	switch (ch) {
6697 	case 'i':
6698 		s->show_ids = !s->show_ids;
6699 		view->count = 0;
6700 		break;
6701 	case 'l':
6702 		view->count = 0;
6703 		if (!s->selected_entry)
6704 			break;
6705 		if (view_is_parent_view(view))
6706 			view_get_split(view, &begin_y, &begin_x);
6707 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6708 		if (view_is_parent_view(view) &&
6709 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6710 			err = view_init_hsplit(view, begin_y);
6711 			if (err)
6712 				break;
6713 		}
6714 		view->focussed = 0;
6715 		log_view->focussed = 1;
6716 		log_view->mode = view->mode;
6717 		log_view->nlines = view->lines - begin_y;
6718 		if (view_is_parent_view(view)) {
6719 			view_transfer_size(log_view, view);
6720 			err = view_close_child(view);
6721 			if (err)
6722 				return err;
6723 			err = view_set_child(view, log_view);
6724 			if (err)
6725 				return err;
6726 			view->focus_child = 1;
6727 		} else
6728 			*new_view = log_view;
6729 		break;
6730 	case 'r':
6731 		view->count = 0;
6732 		if (view_is_parent_view(view))
6733 			view_get_split(view, &begin_y, &begin_x);
6734 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6735 		if (ref_view == NULL)
6736 			return got_error_from_errno("view_open");
6737 		err = open_ref_view(ref_view, s->repo);
6738 		if (err) {
6739 			view_close(ref_view);
6740 			return err;
6741 		}
6742 		if (view_is_parent_view(view) &&
6743 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6744 			err = view_init_hsplit(view, begin_y);
6745 			if (err)
6746 				break;
6747 		}
6748 		view->focussed = 0;
6749 		ref_view->focussed = 1;
6750 		ref_view->mode = view->mode;
6751 		ref_view->nlines = view->lines - begin_y;
6752 		if (view_is_parent_view(view)) {
6753 			view_transfer_size(ref_view, view);
6754 			err = view_close_child(view);
6755 			if (err)
6756 				return err;
6757 			err = view_set_child(view, ref_view);
6758 			if (err)
6759 				return err;
6760 			view->focus_child = 1;
6761 		} else
6762 			*new_view = ref_view;
6763 		break;
6764 	case 'g':
6765 	case KEY_HOME:
6766 		s->selected = 0;
6767 		view->count = 0;
6768 		if (s->tree == s->root)
6769 			s->first_displayed_entry =
6770 			    got_object_tree_get_first_entry(s->tree);
6771 		else
6772 			s->first_displayed_entry = NULL;
6773 		break;
6774 	case 'G':
6775 	case KEY_END: {
6776 		int eos = view->nlines - 3;
6777 
6778 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6779 			--eos;  /* border */
6780 		s->selected = 0;
6781 		view->count = 0;
6782 		te = got_object_tree_get_last_entry(s->tree);
6783 		for (n = 0; n < eos; n++) {
6784 			if (te == NULL) {
6785 				if(s->tree != s->root) {
6786 					s->first_displayed_entry = NULL;
6787 					n++;
6788 				}
6789 				break;
6790 			}
6791 			s->first_displayed_entry = te;
6792 			te = got_tree_entry_get_prev(s->tree, te);
6793 		}
6794 		if (n > 0)
6795 			s->selected = n - 1;
6796 		break;
6797 	}
6798 	case 'k':
6799 	case KEY_UP:
6800 	case CTRL('p'):
6801 		if (s->selected > 0) {
6802 			s->selected--;
6803 			break;
6804 		}
6805 		tree_scroll_up(s, 1);
6806 		if (s->selected_entry == NULL ||
6807 		    (s->tree == s->root && s->selected_entry ==
6808 		     got_object_tree_get_first_entry(s->tree)))
6809 			view->count = 0;
6810 		break;
6811 	case CTRL('u'):
6812 	case 'u':
6813 		nscroll /= 2;
6814 		/* FALL THROUGH */
6815 	case KEY_PPAGE:
6816 	case CTRL('b'):
6817 	case 'b':
6818 		if (s->tree == s->root) {
6819 			if (got_object_tree_get_first_entry(s->tree) ==
6820 			    s->first_displayed_entry)
6821 				s->selected -= MIN(s->selected, nscroll);
6822 		} else {
6823 			if (s->first_displayed_entry == NULL)
6824 				s->selected -= MIN(s->selected, nscroll);
6825 		}
6826 		tree_scroll_up(s, MAX(0, nscroll));
6827 		if (s->selected_entry == NULL ||
6828 		    (s->tree == s->root && s->selected_entry ==
6829 		     got_object_tree_get_first_entry(s->tree)))
6830 			view->count = 0;
6831 		break;
6832 	case 'j':
6833 	case KEY_DOWN:
6834 	case CTRL('n'):
6835 		if (s->selected < s->ndisplayed - 1) {
6836 			s->selected++;
6837 			break;
6838 		}
6839 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6840 		    == NULL) {
6841 			/* can't scroll any further */
6842 			view->count = 0;
6843 			break;
6844 		}
6845 		tree_scroll_down(view, 1);
6846 		break;
6847 	case CTRL('d'):
6848 	case 'd':
6849 		nscroll /= 2;
6850 		/* FALL THROUGH */
6851 	case KEY_NPAGE:
6852 	case CTRL('f'):
6853 	case 'f':
6854 	case ' ':
6855 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6856 		    == NULL) {
6857 			/* can't scroll any further; move cursor down */
6858 			if (s->selected < s->ndisplayed - 1)
6859 				s->selected += MIN(nscroll,
6860 				    s->ndisplayed - s->selected - 1);
6861 			else
6862 				view->count = 0;
6863 			break;
6864 		}
6865 		tree_scroll_down(view, nscroll);
6866 		break;
6867 	case KEY_ENTER:
6868 	case '\r':
6869 	case KEY_BACKSPACE:
6870 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6871 			struct tog_parent_tree *parent;
6872 			/* user selected '..' */
6873 			if (s->tree == s->root) {
6874 				view->count = 0;
6875 				break;
6876 			}
6877 			parent = TAILQ_FIRST(&s->parents);
6878 			TAILQ_REMOVE(&s->parents, parent,
6879 			    entry);
6880 			got_object_tree_close(s->tree);
6881 			s->tree = parent->tree;
6882 			s->first_displayed_entry =
6883 			    parent->first_displayed_entry;
6884 			s->selected_entry =
6885 			    parent->selected_entry;
6886 			s->selected = parent->selected;
6887 			if (s->selected > view->nlines - 3) {
6888 				err = offset_selection_down(view);
6889 				if (err)
6890 					break;
6891 			}
6892 			free(parent);
6893 		} else if (S_ISDIR(got_tree_entry_get_mode(
6894 		    s->selected_entry))) {
6895 			struct got_tree_object *subtree;
6896 			view->count = 0;
6897 			err = got_object_open_as_tree(&subtree, s->repo,
6898 			    got_tree_entry_get_id(s->selected_entry));
6899 			if (err)
6900 				break;
6901 			err = tree_view_visit_subtree(s, subtree);
6902 			if (err) {
6903 				got_object_tree_close(subtree);
6904 				break;
6905 			}
6906 		} else if (S_ISREG(got_tree_entry_get_mode(
6907 		    s->selected_entry))) {
6908 			struct tog_view *blame_view;
6909 			int begin_x = 0, begin_y = 0;
6910 
6911 			if (view_is_parent_view(view))
6912 				view_get_split(view, &begin_y, &begin_x);
6913 
6914 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6915 			    s->selected_entry, &s->parents,
6916 			    s->commit_id, s->repo);
6917 			if (err)
6918 				break;
6919 
6920 			if (view_is_parent_view(view) &&
6921 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
6922 				err = view_init_hsplit(view, begin_y);
6923 				if (err)
6924 					break;
6925 			}
6926 
6927 			view->count = 0;
6928 			view->focussed = 0;
6929 			blame_view->focussed = 1;
6930 			blame_view->mode = view->mode;
6931 			blame_view->nlines = view->lines - begin_y;
6932 			if (view_is_parent_view(view)) {
6933 				view_transfer_size(blame_view, view);
6934 				err = view_close_child(view);
6935 				if (err)
6936 					return err;
6937 				err = view_set_child(view, blame_view);
6938 				if (err)
6939 					return err;
6940 				view->focus_child = 1;
6941 			} else
6942 				*new_view = blame_view;
6943 		}
6944 		break;
6945 	case KEY_RESIZE:
6946 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6947 			s->selected = view->nlines - 4;
6948 		view->count = 0;
6949 		break;
6950 	default:
6951 		view->count = 0;
6952 		break;
6953 	}
6954 
6955 	return err;
6956 }
6957 
6958 __dead static void
6959 usage_tree(void)
6960 {
6961 	endwin();
6962 	fprintf(stderr,
6963 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6964 	    getprogname());
6965 	exit(1);
6966 }
6967 
6968 static const struct got_error *
6969 cmd_tree(int argc, char *argv[])
6970 {
6971 	const struct got_error *error;
6972 	struct got_repository *repo = NULL;
6973 	struct got_worktree *worktree = NULL;
6974 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6975 	struct got_object_id *commit_id = NULL;
6976 	struct got_commit_object *commit = NULL;
6977 	const char *commit_id_arg = NULL;
6978 	char *label = NULL;
6979 	struct got_reference *ref = NULL;
6980 	const char *head_ref_name = NULL;
6981 	int ch;
6982 	struct tog_view *view;
6983 	int *pack_fds = NULL;
6984 
6985 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6986 		switch (ch) {
6987 		case 'c':
6988 			commit_id_arg = optarg;
6989 			break;
6990 		case 'r':
6991 			repo_path = realpath(optarg, NULL);
6992 			if (repo_path == NULL)
6993 				return got_error_from_errno2("realpath",
6994 				    optarg);
6995 			break;
6996 		default:
6997 			usage_tree();
6998 			/* NOTREACHED */
6999 		}
7000 	}
7001 
7002 	argc -= optind;
7003 	argv += optind;
7004 
7005 	if (argc > 1)
7006 		usage_tree();
7007 
7008 	error = got_repo_pack_fds_open(&pack_fds);
7009 	if (error != NULL)
7010 		goto done;
7011 
7012 	if (repo_path == NULL) {
7013 		cwd = getcwd(NULL, 0);
7014 		if (cwd == NULL)
7015 			return got_error_from_errno("getcwd");
7016 		error = got_worktree_open(&worktree, cwd);
7017 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7018 			goto done;
7019 		if (worktree)
7020 			repo_path =
7021 			    strdup(got_worktree_get_repo_path(worktree));
7022 		else
7023 			repo_path = strdup(cwd);
7024 		if (repo_path == NULL) {
7025 			error = got_error_from_errno("strdup");
7026 			goto done;
7027 		}
7028 	}
7029 
7030 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7031 	if (error != NULL)
7032 		goto done;
7033 
7034 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7035 	    repo, worktree);
7036 	if (error)
7037 		goto done;
7038 
7039 	init_curses();
7040 
7041 	error = apply_unveil(got_repo_get_path(repo), NULL);
7042 	if (error)
7043 		goto done;
7044 
7045 	error = tog_load_refs(repo, 0);
7046 	if (error)
7047 		goto done;
7048 
7049 	if (commit_id_arg == NULL) {
7050 		error = got_repo_match_object_id(&commit_id, &label,
7051 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7052 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7053 		if (error)
7054 			goto done;
7055 		head_ref_name = label;
7056 	} else {
7057 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7058 		if (error == NULL)
7059 			head_ref_name = got_ref_get_name(ref);
7060 		else if (error->code != GOT_ERR_NOT_REF)
7061 			goto done;
7062 		error = got_repo_match_object_id(&commit_id, NULL,
7063 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7064 		if (error)
7065 			goto done;
7066 	}
7067 
7068 	error = got_object_open_as_commit(&commit, repo, commit_id);
7069 	if (error)
7070 		goto done;
7071 
7072 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7073 	if (view == NULL) {
7074 		error = got_error_from_errno("view_open");
7075 		goto done;
7076 	}
7077 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7078 	if (error)
7079 		goto done;
7080 	if (!got_path_is_root_dir(in_repo_path)) {
7081 		error = tree_view_walk_path(&view->state.tree, commit,
7082 		    in_repo_path);
7083 		if (error)
7084 			goto done;
7085 	}
7086 
7087 	if (worktree) {
7088 		/* Release work tree lock. */
7089 		got_worktree_close(worktree);
7090 		worktree = NULL;
7091 	}
7092 	error = view_loop(view);
7093 done:
7094 	free(repo_path);
7095 	free(cwd);
7096 	free(commit_id);
7097 	free(label);
7098 	if (ref)
7099 		got_ref_close(ref);
7100 	if (repo) {
7101 		const struct got_error *close_err = got_repo_close(repo);
7102 		if (error == NULL)
7103 			error = close_err;
7104 	}
7105 	if (pack_fds) {
7106 		const struct got_error *pack_err =
7107 		    got_repo_pack_fds_close(pack_fds);
7108 		if (error == NULL)
7109 			error = pack_err;
7110 	}
7111 	tog_free_refs();
7112 	return error;
7113 }
7114 
7115 static const struct got_error *
7116 ref_view_load_refs(struct tog_ref_view_state *s)
7117 {
7118 	struct got_reflist_entry *sre;
7119 	struct tog_reflist_entry *re;
7120 
7121 	s->nrefs = 0;
7122 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7123 		if (strncmp(got_ref_get_name(sre->ref),
7124 		    "refs/got/", 9) == 0 &&
7125 		    strncmp(got_ref_get_name(sre->ref),
7126 		    "refs/got/backup/", 16) != 0)
7127 			continue;
7128 
7129 		re = malloc(sizeof(*re));
7130 		if (re == NULL)
7131 			return got_error_from_errno("malloc");
7132 
7133 		re->ref = got_ref_dup(sre->ref);
7134 		if (re->ref == NULL)
7135 			return got_error_from_errno("got_ref_dup");
7136 		re->idx = s->nrefs++;
7137 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7138 	}
7139 
7140 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7141 	return NULL;
7142 }
7143 
7144 static void
7145 ref_view_free_refs(struct tog_ref_view_state *s)
7146 {
7147 	struct tog_reflist_entry *re;
7148 
7149 	while (!TAILQ_EMPTY(&s->refs)) {
7150 		re = TAILQ_FIRST(&s->refs);
7151 		TAILQ_REMOVE(&s->refs, re, entry);
7152 		got_ref_close(re->ref);
7153 		free(re);
7154 	}
7155 }
7156 
7157 static const struct got_error *
7158 open_ref_view(struct tog_view *view, struct got_repository *repo)
7159 {
7160 	const struct got_error *err = NULL;
7161 	struct tog_ref_view_state *s = &view->state.ref;
7162 
7163 	s->selected_entry = 0;
7164 	s->repo = repo;
7165 
7166 	TAILQ_INIT(&s->refs);
7167 	STAILQ_INIT(&s->colors);
7168 
7169 	err = ref_view_load_refs(s);
7170 	if (err)
7171 		return err;
7172 
7173 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7174 		err = add_color(&s->colors, "^refs/heads/",
7175 		    TOG_COLOR_REFS_HEADS,
7176 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7177 		if (err)
7178 			goto done;
7179 
7180 		err = add_color(&s->colors, "^refs/tags/",
7181 		    TOG_COLOR_REFS_TAGS,
7182 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7183 		if (err)
7184 			goto done;
7185 
7186 		err = add_color(&s->colors, "^refs/remotes/",
7187 		    TOG_COLOR_REFS_REMOTES,
7188 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7189 		if (err)
7190 			goto done;
7191 
7192 		err = add_color(&s->colors, "^refs/got/backup/",
7193 		    TOG_COLOR_REFS_BACKUP,
7194 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7195 		if (err)
7196 			goto done;
7197 	}
7198 
7199 	view->show = show_ref_view;
7200 	view->input = input_ref_view;
7201 	view->close = close_ref_view;
7202 	view->search_start = search_start_ref_view;
7203 	view->search_next = search_next_ref_view;
7204 done:
7205 	if (err)
7206 		free_colors(&s->colors);
7207 	return err;
7208 }
7209 
7210 static const struct got_error *
7211 close_ref_view(struct tog_view *view)
7212 {
7213 	struct tog_ref_view_state *s = &view->state.ref;
7214 
7215 	ref_view_free_refs(s);
7216 	free_colors(&s->colors);
7217 
7218 	return NULL;
7219 }
7220 
7221 static const struct got_error *
7222 resolve_reflist_entry(struct got_object_id **commit_id,
7223     struct tog_reflist_entry *re, struct got_repository *repo)
7224 {
7225 	const struct got_error *err = NULL;
7226 	struct got_object_id *obj_id;
7227 	struct got_tag_object *tag = NULL;
7228 	int obj_type;
7229 
7230 	*commit_id = NULL;
7231 
7232 	err = got_ref_resolve(&obj_id, repo, re->ref);
7233 	if (err)
7234 		return err;
7235 
7236 	err = got_object_get_type(&obj_type, repo, obj_id);
7237 	if (err)
7238 		goto done;
7239 
7240 	switch (obj_type) {
7241 	case GOT_OBJ_TYPE_COMMIT:
7242 		*commit_id = obj_id;
7243 		break;
7244 	case GOT_OBJ_TYPE_TAG:
7245 		err = got_object_open_as_tag(&tag, repo, obj_id);
7246 		if (err)
7247 			goto done;
7248 		free(obj_id);
7249 		err = got_object_get_type(&obj_type, repo,
7250 		    got_object_tag_get_object_id(tag));
7251 		if (err)
7252 			goto done;
7253 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7254 			err = got_error(GOT_ERR_OBJ_TYPE);
7255 			goto done;
7256 		}
7257 		*commit_id = got_object_id_dup(
7258 		    got_object_tag_get_object_id(tag));
7259 		if (*commit_id == NULL) {
7260 			err = got_error_from_errno("got_object_id_dup");
7261 			goto done;
7262 		}
7263 		break;
7264 	default:
7265 		err = got_error(GOT_ERR_OBJ_TYPE);
7266 		break;
7267 	}
7268 
7269 done:
7270 	if (tag)
7271 		got_object_tag_close(tag);
7272 	if (err) {
7273 		free(*commit_id);
7274 		*commit_id = NULL;
7275 	}
7276 	return err;
7277 }
7278 
7279 static const struct got_error *
7280 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7281     struct tog_reflist_entry *re, struct got_repository *repo)
7282 {
7283 	struct tog_view *log_view;
7284 	const struct got_error *err = NULL;
7285 	struct got_object_id *commit_id = NULL;
7286 
7287 	*new_view = NULL;
7288 
7289 	err = resolve_reflist_entry(&commit_id, re, repo);
7290 	if (err) {
7291 		if (err->code != GOT_ERR_OBJ_TYPE)
7292 			return err;
7293 		else
7294 			return NULL;
7295 	}
7296 
7297 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7298 	if (log_view == NULL) {
7299 		err = got_error_from_errno("view_open");
7300 		goto done;
7301 	}
7302 
7303 	err = open_log_view(log_view, commit_id, repo,
7304 	    got_ref_get_name(re->ref), "", 0);
7305 done:
7306 	if (err)
7307 		view_close(log_view);
7308 	else
7309 		*new_view = log_view;
7310 	free(commit_id);
7311 	return err;
7312 }
7313 
7314 static void
7315 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7316 {
7317 	struct tog_reflist_entry *re;
7318 	int i = 0;
7319 
7320 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7321 		return;
7322 
7323 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7324 	while (i++ < maxscroll) {
7325 		if (re == NULL)
7326 			break;
7327 		s->first_displayed_entry = re;
7328 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7329 	}
7330 }
7331 
7332 static const struct got_error *
7333 ref_scroll_down(struct tog_view *view, int maxscroll)
7334 {
7335 	struct tog_ref_view_state *s = &view->state.ref;
7336 	struct tog_reflist_entry *next, *last;
7337 	int n = 0;
7338 
7339 	if (s->first_displayed_entry)
7340 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7341 	else
7342 		next = TAILQ_FIRST(&s->refs);
7343 
7344 	last = s->last_displayed_entry;
7345 	while (next && n++ < maxscroll) {
7346 		if (last)
7347 			last = TAILQ_NEXT(last, entry);
7348 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7349 			s->first_displayed_entry = next;
7350 			next = TAILQ_NEXT(next, entry);
7351 		}
7352 	}
7353 
7354 	return NULL;
7355 }
7356 
7357 static const struct got_error *
7358 search_start_ref_view(struct tog_view *view)
7359 {
7360 	struct tog_ref_view_state *s = &view->state.ref;
7361 
7362 	s->matched_entry = NULL;
7363 	return NULL;
7364 }
7365 
7366 static int
7367 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7368 {
7369 	regmatch_t regmatch;
7370 
7371 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7372 	    0) == 0;
7373 }
7374 
7375 static const struct got_error *
7376 search_next_ref_view(struct tog_view *view)
7377 {
7378 	struct tog_ref_view_state *s = &view->state.ref;
7379 	struct tog_reflist_entry *re = NULL;
7380 
7381 	if (!view->searching) {
7382 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7383 		return NULL;
7384 	}
7385 
7386 	if (s->matched_entry) {
7387 		if (view->searching == TOG_SEARCH_FORWARD) {
7388 			if (s->selected_entry)
7389 				re = TAILQ_NEXT(s->selected_entry, entry);
7390 			else
7391 				re = TAILQ_PREV(s->selected_entry,
7392 				    tog_reflist_head, entry);
7393 		} else {
7394 			if (s->selected_entry == NULL)
7395 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7396 			else
7397 				re = TAILQ_PREV(s->selected_entry,
7398 				    tog_reflist_head, entry);
7399 		}
7400 	} else {
7401 		if (s->selected_entry)
7402 			re = s->selected_entry;
7403 		else if (view->searching == TOG_SEARCH_FORWARD)
7404 			re = TAILQ_FIRST(&s->refs);
7405 		else
7406 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7407 	}
7408 
7409 	while (1) {
7410 		if (re == NULL) {
7411 			if (s->matched_entry == NULL) {
7412 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7413 				return NULL;
7414 			}
7415 			if (view->searching == TOG_SEARCH_FORWARD)
7416 				re = TAILQ_FIRST(&s->refs);
7417 			else
7418 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7419 		}
7420 
7421 		if (match_reflist_entry(re, &view->regex)) {
7422 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7423 			s->matched_entry = re;
7424 			break;
7425 		}
7426 
7427 		if (view->searching == TOG_SEARCH_FORWARD)
7428 			re = TAILQ_NEXT(re, entry);
7429 		else
7430 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7431 	}
7432 
7433 	if (s->matched_entry) {
7434 		s->first_displayed_entry = s->matched_entry;
7435 		s->selected = 0;
7436 	}
7437 
7438 	return NULL;
7439 }
7440 
7441 static const struct got_error *
7442 show_ref_view(struct tog_view *view)
7443 {
7444 	const struct got_error *err = NULL;
7445 	struct tog_ref_view_state *s = &view->state.ref;
7446 	struct tog_reflist_entry *re;
7447 	char *line = NULL;
7448 	wchar_t *wline;
7449 	struct tog_color *tc;
7450 	int width, n;
7451 	int limit = view->nlines;
7452 
7453 	werase(view->window);
7454 
7455 	s->ndisplayed = 0;
7456 	if (view_is_hsplit_top(view))
7457 		--limit;  /* border */
7458 
7459 	if (limit == 0)
7460 		return NULL;
7461 
7462 	re = s->first_displayed_entry;
7463 
7464 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7465 	    s->nrefs) == -1)
7466 		return got_error_from_errno("asprintf");
7467 
7468 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7469 	if (err) {
7470 		free(line);
7471 		return err;
7472 	}
7473 	if (view_needs_focus_indication(view))
7474 		wstandout(view->window);
7475 	waddwstr(view->window, wline);
7476 	if (view_needs_focus_indication(view))
7477 		wstandend(view->window);
7478 	free(wline);
7479 	wline = NULL;
7480 	free(line);
7481 	line = NULL;
7482 	if (width < view->ncols - 1)
7483 		waddch(view->window, '\n');
7484 	if (--limit <= 0)
7485 		return NULL;
7486 
7487 	n = 0;
7488 	while (re && limit > 0) {
7489 		char *line = NULL;
7490 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7491 
7492 		if (s->show_date) {
7493 			struct got_commit_object *ci;
7494 			struct got_tag_object *tag;
7495 			struct got_object_id *id;
7496 			struct tm tm;
7497 			time_t t;
7498 
7499 			err = got_ref_resolve(&id, s->repo, re->ref);
7500 			if (err)
7501 				return err;
7502 			err = got_object_open_as_tag(&tag, s->repo, id);
7503 			if (err) {
7504 				if (err->code != GOT_ERR_OBJ_TYPE) {
7505 					free(id);
7506 					return err;
7507 				}
7508 				err = got_object_open_as_commit(&ci, s->repo,
7509 				    id);
7510 				if (err) {
7511 					free(id);
7512 					return err;
7513 				}
7514 				t = got_object_commit_get_committer_time(ci);
7515 				got_object_commit_close(ci);
7516 			} else {
7517 				t = got_object_tag_get_tagger_time(tag);
7518 				got_object_tag_close(tag);
7519 			}
7520 			free(id);
7521 			if (gmtime_r(&t, &tm) == NULL)
7522 				return got_error_from_errno("gmtime_r");
7523 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7524 				return got_error(GOT_ERR_NO_SPACE);
7525 		}
7526 		if (got_ref_is_symbolic(re->ref)) {
7527 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7528 			    ymd : "", got_ref_get_name(re->ref),
7529 			    got_ref_get_symref_target(re->ref)) == -1)
7530 				return got_error_from_errno("asprintf");
7531 		} else if (s->show_ids) {
7532 			struct got_object_id *id;
7533 			char *id_str;
7534 			err = got_ref_resolve(&id, s->repo, re->ref);
7535 			if (err)
7536 				return err;
7537 			err = got_object_id_str(&id_str, id);
7538 			if (err) {
7539 				free(id);
7540 				return err;
7541 			}
7542 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7543 			    got_ref_get_name(re->ref), id_str) == -1) {
7544 				err = got_error_from_errno("asprintf");
7545 				free(id);
7546 				free(id_str);
7547 				return err;
7548 			}
7549 			free(id);
7550 			free(id_str);
7551 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7552 		    got_ref_get_name(re->ref)) == -1)
7553 			return got_error_from_errno("asprintf");
7554 
7555 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7556 		    0, 0);
7557 		if (err) {
7558 			free(line);
7559 			return err;
7560 		}
7561 		if (n == s->selected) {
7562 			if (view->focussed)
7563 				wstandout(view->window);
7564 			s->selected_entry = re;
7565 		}
7566 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7567 		if (tc)
7568 			wattr_on(view->window,
7569 			    COLOR_PAIR(tc->colorpair), NULL);
7570 		waddwstr(view->window, wline);
7571 		if (tc)
7572 			wattr_off(view->window,
7573 			    COLOR_PAIR(tc->colorpair), NULL);
7574 		if (width < view->ncols - 1)
7575 			waddch(view->window, '\n');
7576 		if (n == s->selected && view->focussed)
7577 			wstandend(view->window);
7578 		free(line);
7579 		free(wline);
7580 		wline = NULL;
7581 		n++;
7582 		s->ndisplayed++;
7583 		s->last_displayed_entry = re;
7584 
7585 		limit--;
7586 		re = TAILQ_NEXT(re, entry);
7587 	}
7588 
7589 	view_border(view);
7590 	return err;
7591 }
7592 
7593 static const struct got_error *
7594 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7595     struct tog_reflist_entry *re, struct got_repository *repo)
7596 {
7597 	const struct got_error *err = NULL;
7598 	struct got_object_id *commit_id = NULL;
7599 	struct tog_view *tree_view;
7600 
7601 	*new_view = NULL;
7602 
7603 	err = resolve_reflist_entry(&commit_id, re, repo);
7604 	if (err) {
7605 		if (err->code != GOT_ERR_OBJ_TYPE)
7606 			return err;
7607 		else
7608 			return NULL;
7609 	}
7610 
7611 
7612 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7613 	if (tree_view == NULL) {
7614 		err = got_error_from_errno("view_open");
7615 		goto done;
7616 	}
7617 
7618 	err = open_tree_view(tree_view, commit_id,
7619 	    got_ref_get_name(re->ref), repo);
7620 	if (err)
7621 		goto done;
7622 
7623 	*new_view = tree_view;
7624 done:
7625 	free(commit_id);
7626 	return err;
7627 }
7628 static const struct got_error *
7629 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7630 {
7631 	const struct got_error *err = NULL;
7632 	struct tog_ref_view_state *s = &view->state.ref;
7633 	struct tog_view *log_view, *tree_view;
7634 	struct tog_reflist_entry *re;
7635 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7636 
7637 	switch (ch) {
7638 	case 'i':
7639 		s->show_ids = !s->show_ids;
7640 		view->count = 0;
7641 		break;
7642 	case 'm':
7643 		s->show_date = !s->show_date;
7644 		view->count = 0;
7645 		break;
7646 	case 'o':
7647 		s->sort_by_date = !s->sort_by_date;
7648 		view->count = 0;
7649 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7650 		    got_ref_cmp_by_commit_timestamp_descending :
7651 		    tog_ref_cmp_by_name, s->repo);
7652 		if (err)
7653 			break;
7654 		got_reflist_object_id_map_free(tog_refs_idmap);
7655 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7656 		    &tog_refs, s->repo);
7657 		if (err)
7658 			break;
7659 		ref_view_free_refs(s);
7660 		err = ref_view_load_refs(s);
7661 		break;
7662 	case KEY_ENTER:
7663 	case '\r':
7664 		view->count = 0;
7665 		if (!s->selected_entry)
7666 			break;
7667 		if (view_is_parent_view(view))
7668 			view_get_split(view, &begin_y, &begin_x);
7669 
7670 		err = log_ref_entry(&log_view, begin_y, begin_x,
7671 		    s->selected_entry, s->repo);
7672 		if (err)
7673 			break;
7674 
7675 		if (view_is_parent_view(view) &&
7676 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7677 			err = view_init_hsplit(view, begin_y);
7678 			if (err)
7679 				break;
7680 		}
7681 
7682 		view->focussed = 0;
7683 		log_view->focussed = 1;
7684 		log_view->mode = view->mode;
7685 		log_view->nlines = view->lines - begin_y;
7686 		if (view_is_parent_view(view)) {
7687 			view_transfer_size(log_view, view);
7688 			err = view_close_child(view);
7689 			if (err)
7690 				return err;
7691 			err = view_set_child(view, log_view);
7692 			if (err)
7693 				return err;
7694 			view->focus_child = 1;
7695 		} else
7696 			*new_view = log_view;
7697 		break;
7698 	case 't':
7699 		view->count = 0;
7700 		if (!s->selected_entry)
7701 			break;
7702 		if (view_is_parent_view(view))
7703 			view_get_split(view, &begin_y, &begin_x);
7704 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7705 		    s->selected_entry, s->repo);
7706 		if (err || tree_view == NULL)
7707 			break;
7708 		if (view_is_parent_view(view) &&
7709 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7710 			err = view_init_hsplit(view, begin_y);
7711 			if (err)
7712 				break;
7713 		}
7714 		view->focussed = 0;
7715 		tree_view->focussed = 1;
7716 		tree_view->mode = view->mode;
7717 		tree_view->nlines = view->lines - begin_y;
7718 		if (view_is_parent_view(view)) {
7719 			view_transfer_size(tree_view, view);
7720 			err = view_close_child(view);
7721 			if (err)
7722 				return err;
7723 			err = view_set_child(view, tree_view);
7724 			if (err)
7725 				return err;
7726 			view->focus_child = 1;
7727 		} else
7728 			*new_view = tree_view;
7729 		break;
7730 	case 'g':
7731 	case KEY_HOME:
7732 		s->selected = 0;
7733 		view->count = 0;
7734 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7735 		break;
7736 	case 'G':
7737 	case KEY_END: {
7738 		int eos = view->nlines - 1;
7739 
7740 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7741 			--eos;  /* border */
7742 		s->selected = 0;
7743 		view->count = 0;
7744 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7745 		for (n = 0; n < eos; n++) {
7746 			if (re == NULL)
7747 				break;
7748 			s->first_displayed_entry = re;
7749 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7750 		}
7751 		if (n > 0)
7752 			s->selected = n - 1;
7753 		break;
7754 	}
7755 	case 'k':
7756 	case KEY_UP:
7757 	case CTRL('p'):
7758 		if (s->selected > 0) {
7759 			s->selected--;
7760 			break;
7761 		}
7762 		ref_scroll_up(s, 1);
7763 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7764 			view->count = 0;
7765 		break;
7766 	case CTRL('u'):
7767 	case 'u':
7768 		nscroll /= 2;
7769 		/* FALL THROUGH */
7770 	case KEY_PPAGE:
7771 	case CTRL('b'):
7772 	case 'b':
7773 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7774 			s->selected -= MIN(nscroll, s->selected);
7775 		ref_scroll_up(s, MAX(0, nscroll));
7776 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7777 			view->count = 0;
7778 		break;
7779 	case 'j':
7780 	case KEY_DOWN:
7781 	case CTRL('n'):
7782 		if (s->selected < s->ndisplayed - 1) {
7783 			s->selected++;
7784 			break;
7785 		}
7786 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7787 			/* can't scroll any further */
7788 			view->count = 0;
7789 			break;
7790 		}
7791 		ref_scroll_down(view, 1);
7792 		break;
7793 	case CTRL('d'):
7794 	case 'd':
7795 		nscroll /= 2;
7796 		/* FALL THROUGH */
7797 	case KEY_NPAGE:
7798 	case CTRL('f'):
7799 	case 'f':
7800 	case ' ':
7801 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7802 			/* can't scroll any further; move cursor down */
7803 			if (s->selected < s->ndisplayed - 1)
7804 				s->selected += MIN(nscroll,
7805 				    s->ndisplayed - s->selected - 1);
7806 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7807 				s->selected += s->ndisplayed - s->selected - 1;
7808 			view->count = 0;
7809 			break;
7810 		}
7811 		ref_scroll_down(view, nscroll);
7812 		break;
7813 	case CTRL('l'):
7814 		view->count = 0;
7815 		tog_free_refs();
7816 		err = tog_load_refs(s->repo, s->sort_by_date);
7817 		if (err)
7818 			break;
7819 		ref_view_free_refs(s);
7820 		err = ref_view_load_refs(s);
7821 		break;
7822 	case KEY_RESIZE:
7823 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7824 			s->selected = view->nlines - 2;
7825 		break;
7826 	default:
7827 		view->count = 0;
7828 		break;
7829 	}
7830 
7831 	return err;
7832 }
7833 
7834 __dead static void
7835 usage_ref(void)
7836 {
7837 	endwin();
7838 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7839 	    getprogname());
7840 	exit(1);
7841 }
7842 
7843 static const struct got_error *
7844 cmd_ref(int argc, char *argv[])
7845 {
7846 	const struct got_error *error;
7847 	struct got_repository *repo = NULL;
7848 	struct got_worktree *worktree = NULL;
7849 	char *cwd = NULL, *repo_path = NULL;
7850 	int ch;
7851 	struct tog_view *view;
7852 	int *pack_fds = NULL;
7853 
7854 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7855 		switch (ch) {
7856 		case 'r':
7857 			repo_path = realpath(optarg, NULL);
7858 			if (repo_path == NULL)
7859 				return got_error_from_errno2("realpath",
7860 				    optarg);
7861 			break;
7862 		default:
7863 			usage_ref();
7864 			/* NOTREACHED */
7865 		}
7866 	}
7867 
7868 	argc -= optind;
7869 	argv += optind;
7870 
7871 	if (argc > 1)
7872 		usage_ref();
7873 
7874 	error = got_repo_pack_fds_open(&pack_fds);
7875 	if (error != NULL)
7876 		goto done;
7877 
7878 	if (repo_path == NULL) {
7879 		cwd = getcwd(NULL, 0);
7880 		if (cwd == NULL)
7881 			return got_error_from_errno("getcwd");
7882 		error = got_worktree_open(&worktree, cwd);
7883 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7884 			goto done;
7885 		if (worktree)
7886 			repo_path =
7887 			    strdup(got_worktree_get_repo_path(worktree));
7888 		else
7889 			repo_path = strdup(cwd);
7890 		if (repo_path == NULL) {
7891 			error = got_error_from_errno("strdup");
7892 			goto done;
7893 		}
7894 	}
7895 
7896 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7897 	if (error != NULL)
7898 		goto done;
7899 
7900 	init_curses();
7901 
7902 	error = apply_unveil(got_repo_get_path(repo), NULL);
7903 	if (error)
7904 		goto done;
7905 
7906 	error = tog_load_refs(repo, 0);
7907 	if (error)
7908 		goto done;
7909 
7910 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7911 	if (view == NULL) {
7912 		error = got_error_from_errno("view_open");
7913 		goto done;
7914 	}
7915 
7916 	error = open_ref_view(view, repo);
7917 	if (error)
7918 		goto done;
7919 
7920 	if (worktree) {
7921 		/* Release work tree lock. */
7922 		got_worktree_close(worktree);
7923 		worktree = NULL;
7924 	}
7925 	error = view_loop(view);
7926 done:
7927 	free(repo_path);
7928 	free(cwd);
7929 	if (repo) {
7930 		const struct got_error *close_err = got_repo_close(repo);
7931 		if (close_err)
7932 			error = close_err;
7933 	}
7934 	if (pack_fds) {
7935 		const struct got_error *pack_err =
7936 		    got_repo_pack_fds_close(pack_fds);
7937 		if (error == NULL)
7938 			error = pack_err;
7939 	}
7940 	tog_free_refs();
7941 	return error;
7942 }
7943 
7944 /*
7945  * If view was scrolled down to move the selected line into view when opening a
7946  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7947  */
7948 static void
7949 offset_selection_up(struct tog_view *view)
7950 {
7951 	switch (view->type) {
7952 	case TOG_VIEW_BLAME: {
7953 		struct tog_blame_view_state *s = &view->state.blame;
7954 		if (s->first_displayed_line == 1) {
7955 			s->selected_line = MAX(s->selected_line - view->offset,
7956 			    1);
7957 			break;
7958 		}
7959 		if (s->first_displayed_line > view->offset)
7960 			s->first_displayed_line -= view->offset;
7961 		else
7962 			s->first_displayed_line = 1;
7963 		s->selected_line += view->offset;
7964 		break;
7965 	}
7966 	case TOG_VIEW_LOG:
7967 		log_scroll_up(&view->state.log, view->offset);
7968 		view->state.log.selected += view->offset;
7969 		break;
7970 	case TOG_VIEW_REF:
7971 		ref_scroll_up(&view->state.ref, view->offset);
7972 		view->state.ref.selected += view->offset;
7973 		break;
7974 	case TOG_VIEW_TREE:
7975 		tree_scroll_up(&view->state.tree, view->offset);
7976 		view->state.tree.selected += view->offset;
7977 		break;
7978 	default:
7979 		break;
7980 	}
7981 
7982 	view->offset = 0;
7983 }
7984 
7985 /*
7986  * If the selected line is in the section of screen covered by the bottom split,
7987  * scroll down offset lines to move it into view and index its new position.
7988  */
7989 static const struct got_error *
7990 offset_selection_down(struct tog_view *view)
7991 {
7992 	const struct got_error	*err = NULL;
7993 	const struct got_error	*(*scrolld)(struct tog_view *, int);
7994 	int			*selected = NULL;
7995 	int			 header, offset;
7996 
7997 	switch (view->type) {
7998 	case TOG_VIEW_BLAME: {
7999 		struct tog_blame_view_state *s = &view->state.blame;
8000 		header = 3;
8001 		scrolld = NULL;
8002 		if (s->selected_line > view->nlines - header) {
8003 			offset = abs(view->nlines - s->selected_line - header);
8004 			s->first_displayed_line += offset;
8005 			s->selected_line -= offset;
8006 			view->offset = offset;
8007 		}
8008 		break;
8009 	}
8010 	case TOG_VIEW_LOG: {
8011 		struct tog_log_view_state *s = &view->state.log;
8012 		scrolld = &log_scroll_down;
8013 		header = view_is_parent_view(view) ? 3 : 2;
8014 		selected = &s->selected;
8015 		break;
8016 	}
8017 	case TOG_VIEW_REF: {
8018 		struct tog_ref_view_state *s = &view->state.ref;
8019 		scrolld = &ref_scroll_down;
8020 		header = 3;
8021 		selected = &s->selected;
8022 		break;
8023 	}
8024 	case TOG_VIEW_TREE: {
8025 		struct tog_tree_view_state *s = &view->state.tree;
8026 		scrolld = &tree_scroll_down;
8027 		header = 5;
8028 		selected = &s->selected;
8029 		break;
8030 	}
8031 	default:
8032 		selected = NULL;
8033 		scrolld = NULL;
8034 		header = 0;
8035 		break;
8036 	}
8037 
8038 	if (selected && *selected > view->nlines - header) {
8039 		offset = abs(view->nlines - *selected - header);
8040 		view->offset = offset;
8041 		if (scrolld && offset) {
8042 			err = scrolld(view, offset);
8043 			*selected -= offset;
8044 		}
8045 	}
8046 
8047 	return err;
8048 }
8049 
8050 static void
8051 list_commands(FILE *fp)
8052 {
8053 	size_t i;
8054 
8055 	fprintf(fp, "commands:");
8056 	for (i = 0; i < nitems(tog_commands); i++) {
8057 		const struct tog_cmd *cmd = &tog_commands[i];
8058 		fprintf(fp, " %s", cmd->name);
8059 	}
8060 	fputc('\n', fp);
8061 }
8062 
8063 __dead static void
8064 usage(int hflag, int status)
8065 {
8066 	FILE *fp = (status == 0) ? stdout : stderr;
8067 
8068 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8069 	    getprogname());
8070 	if (hflag) {
8071 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8072 		list_commands(fp);
8073 	}
8074 	exit(status);
8075 }
8076 
8077 static char **
8078 make_argv(int argc, ...)
8079 {
8080 	va_list ap;
8081 	char **argv;
8082 	int i;
8083 
8084 	va_start(ap, argc);
8085 
8086 	argv = calloc(argc, sizeof(char *));
8087 	if (argv == NULL)
8088 		err(1, "calloc");
8089 	for (i = 0; i < argc; i++) {
8090 		argv[i] = strdup(va_arg(ap, char *));
8091 		if (argv[i] == NULL)
8092 			err(1, "strdup");
8093 	}
8094 
8095 	va_end(ap);
8096 	return argv;
8097 }
8098 
8099 /*
8100  * Try to convert 'tog path' into a 'tog log path' command.
8101  * The user could simply have mistyped the command rather than knowingly
8102  * provided a path. So check whether argv[0] can in fact be resolved
8103  * to a path in the HEAD commit and print a special error if not.
8104  * This hack is for mpi@ <3
8105  */
8106 static const struct got_error *
8107 tog_log_with_path(int argc, char *argv[])
8108 {
8109 	const struct got_error *error = NULL, *close_err;
8110 	const struct tog_cmd *cmd = NULL;
8111 	struct got_repository *repo = NULL;
8112 	struct got_worktree *worktree = NULL;
8113 	struct got_object_id *commit_id = NULL, *id = NULL;
8114 	struct got_commit_object *commit = NULL;
8115 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8116 	char *commit_id_str = NULL, **cmd_argv = NULL;
8117 	int *pack_fds = NULL;
8118 
8119 	cwd = getcwd(NULL, 0);
8120 	if (cwd == NULL)
8121 		return got_error_from_errno("getcwd");
8122 
8123 	error = got_repo_pack_fds_open(&pack_fds);
8124 	if (error != NULL)
8125 		goto done;
8126 
8127 	error = got_worktree_open(&worktree, cwd);
8128 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8129 		goto done;
8130 
8131 	if (worktree)
8132 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8133 	else
8134 		repo_path = strdup(cwd);
8135 	if (repo_path == NULL) {
8136 		error = got_error_from_errno("strdup");
8137 		goto done;
8138 	}
8139 
8140 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8141 	if (error != NULL)
8142 		goto done;
8143 
8144 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8145 	    repo, worktree);
8146 	if (error)
8147 		goto done;
8148 
8149 	error = tog_load_refs(repo, 0);
8150 	if (error)
8151 		goto done;
8152 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8153 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8154 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8155 	if (error)
8156 		goto done;
8157 
8158 	if (worktree) {
8159 		got_worktree_close(worktree);
8160 		worktree = NULL;
8161 	}
8162 
8163 	error = got_object_open_as_commit(&commit, repo, commit_id);
8164 	if (error)
8165 		goto done;
8166 
8167 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8168 	if (error) {
8169 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8170 			goto done;
8171 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8172 		    getprogname(), argv[0]);
8173 		usage(1, 1);
8174 		/* not reached */
8175 	}
8176 
8177 	close_err = got_repo_close(repo);
8178 	if (error == NULL)
8179 		error = close_err;
8180 	repo = NULL;
8181 
8182 	error = got_object_id_str(&commit_id_str, commit_id);
8183 	if (error)
8184 		goto done;
8185 
8186 	cmd = &tog_commands[0]; /* log */
8187 	argc = 4;
8188 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8189 	error = cmd->cmd_main(argc, cmd_argv);
8190 done:
8191 	if (repo) {
8192 		close_err = got_repo_close(repo);
8193 		if (error == NULL)
8194 			error = close_err;
8195 	}
8196 	if (commit)
8197 		got_object_commit_close(commit);
8198 	if (worktree)
8199 		got_worktree_close(worktree);
8200 	if (pack_fds) {
8201 		const struct got_error *pack_err =
8202 		    got_repo_pack_fds_close(pack_fds);
8203 		if (error == NULL)
8204 			error = pack_err;
8205 	}
8206 	free(id);
8207 	free(commit_id_str);
8208 	free(commit_id);
8209 	free(cwd);
8210 	free(repo_path);
8211 	free(in_repo_path);
8212 	if (cmd_argv) {
8213 		int i;
8214 		for (i = 0; i < argc; i++)
8215 			free(cmd_argv[i]);
8216 		free(cmd_argv);
8217 	}
8218 	tog_free_refs();
8219 	return error;
8220 }
8221 
8222 int
8223 main(int argc, char *argv[])
8224 {
8225 	const struct got_error *error = NULL;
8226 	const struct tog_cmd *cmd = NULL;
8227 	int ch, hflag = 0, Vflag = 0;
8228 	char **cmd_argv = NULL;
8229 	static const struct option longopts[] = {
8230 	    { "version", no_argument, NULL, 'V' },
8231 	    { NULL, 0, NULL, 0}
8232 	};
8233 	char *diff_algo_str = NULL;
8234 
8235 	setlocale(LC_CTYPE, "");
8236 
8237 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8238 		switch (ch) {
8239 		case 'h':
8240 			hflag = 1;
8241 			break;
8242 		case 'V':
8243 			Vflag = 1;
8244 			break;
8245 		default:
8246 			usage(hflag, 1);
8247 			/* NOTREACHED */
8248 		}
8249 	}
8250 
8251 	argc -= optind;
8252 	argv += optind;
8253 	optind = 1;
8254 	optreset = 1;
8255 
8256 	if (Vflag) {
8257 		got_version_print_str();
8258 		return 0;
8259 	}
8260 
8261 #ifndef PROFILE
8262 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8263 	    NULL) == -1)
8264 		err(1, "pledge");
8265 #endif
8266 
8267 	if (argc == 0) {
8268 		if (hflag)
8269 			usage(hflag, 0);
8270 		/* Build an argument vector which runs a default command. */
8271 		cmd = &tog_commands[0];
8272 		argc = 1;
8273 		cmd_argv = make_argv(argc, cmd->name);
8274 	} else {
8275 		size_t i;
8276 
8277 		/* Did the user specify a command? */
8278 		for (i = 0; i < nitems(tog_commands); i++) {
8279 			if (strncmp(tog_commands[i].name, argv[0],
8280 			    strlen(argv[0])) == 0) {
8281 				cmd = &tog_commands[i];
8282 				break;
8283 			}
8284 		}
8285 	}
8286 
8287 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8288 	if (diff_algo_str) {
8289 		if (strcasecmp(diff_algo_str, "patience") == 0)
8290 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8291 		if (strcasecmp(diff_algo_str, "myers") == 0)
8292 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8293 	}
8294 
8295 	if (cmd == NULL) {
8296 		if (argc != 1)
8297 			usage(0, 1);
8298 		/* No command specified; try log with a path */
8299 		error = tog_log_with_path(argc, argv);
8300 	} else {
8301 		if (hflag)
8302 			cmd->cmd_usage();
8303 		else
8304 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8305 	}
8306 
8307 	endwin();
8308 	putchar('\n');
8309 	if (cmd_argv) {
8310 		int i;
8311 		for (i = 0; i < argc; i++)
8312 			free(cmd_argv[i]);
8313 		free(cmd_argv);
8314 	}
8315 
8316 	if (error && error->code != GOT_ERR_CANCELLED)
8317 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8318 	return 0;
8319 }