1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/stat.h>
18 #include <sys/ioctl.h>
19 
20 #include <ctype.h>
21 #include <errno.h>
22 #if defined(__FreeBSD__) || defined(__APPLE__)
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #endif
25 #include <curses.h>
26 #include <panel.h>
27 #include <locale.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_compat.h"
45 
46 #include "got_version.h"
47 #include "got_error.h"
48 #include "got_object.h"
49 #include "got_reference.h"
50 #include "got_repository.h"
51 #include "got_diff.h"
52 #include "got_opentemp.h"
53 #include "got_utf8.h"
54 #include "got_cancel.h"
55 #include "got_commit_graph.h"
56 #include "got_blame.h"
57 #include "got_privsep.h"
58 #include "got_path.h"
59 #include "got_worktree.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #ifndef CTRL
70 #define CTRL(x)		((x) & 0x1f)
71 #endif
72 
73 #ifndef nitems
74 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
75 #endif
76 
77 struct tog_cmd {
78 	const char *name;
79 	const struct got_error *(*cmd_main)(int, char *[]);
80 	void (*cmd_usage)(void);
81 };
82 
83 __dead static void	usage(int, int);
84 __dead static void	usage_log(void);
85 __dead static void	usage_diff(void);
86 __dead static void	usage_blame(void);
87 __dead static void	usage_tree(void);
88 __dead static void	usage_ref(void);
89 
90 static const struct got_error*	cmd_log(int, char *[]);
91 static const struct got_error*	cmd_diff(int, char *[]);
92 static const struct got_error*	cmd_blame(int, char *[]);
93 static const struct got_error*	cmd_tree(int, char *[]);
94 static const struct got_error*	cmd_ref(int, char *[]);
95 
96 static const struct tog_cmd tog_commands[] = {
97 	{ "log",	cmd_log,	usage_log },
98 	{ "diff",	cmd_diff,	usage_diff },
99 	{ "blame",	cmd_blame,	usage_blame },
100 	{ "tree",	cmd_tree,	usage_tree },
101 	{ "ref",	cmd_ref,	usage_ref },
102 };
103 
104 enum tog_view_type {
105 	TOG_VIEW_DIFF,
106 	TOG_VIEW_LOG,
107 	TOG_VIEW_BLAME,
108 	TOG_VIEW_TREE,
109 	TOG_VIEW_REF,
110 };
111 
112 enum tog_view_mode {
113 	TOG_VIEW_SPLIT_NONE,
114 	TOG_VIEW_SPLIT_VERT,
115 	TOG_VIEW_SPLIT_HRZN
116 };
117 
118 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
119 
120 #define TOG_EOF_STRING	"(END)"
121 
122 struct commit_queue_entry {
123 	TAILQ_ENTRY(commit_queue_entry) entry;
124 	struct got_object_id *id;
125 	struct got_commit_object *commit;
126 	int idx;
127 };
128 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
129 struct commit_queue {
130 	int ncommits;
131 	struct commit_queue_head head;
132 };
133 
134 struct tog_color {
135 	STAILQ_ENTRY(tog_color) entry;
136 	regex_t regex;
137 	short colorpair;
138 };
139 STAILQ_HEAD(tog_colors, tog_color);
140 
141 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
142 static struct got_reflist_object_id_map *tog_refs_idmap;
143 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
144 
145 static const struct got_error *
146 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
147     struct got_reference* re2)
148 {
149 	const char *name1 = got_ref_get_name(re1);
150 	const char *name2 = got_ref_get_name(re2);
151 	int isbackup1, isbackup2;
152 
153 	/* Sort backup refs towards the bottom of the list. */
154 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
155 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
156 	if (!isbackup1 && isbackup2) {
157 		*cmp = -1;
158 		return NULL;
159 	} else if (isbackup1 && !isbackup2) {
160 		*cmp = 1;
161 		return NULL;
162 	}
163 
164 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
165 	return NULL;
166 }
167 
168 static const struct got_error *
169 tog_load_refs(struct got_repository *repo, int sort_by_date)
170 {
171 	const struct got_error *err;
172 
173 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
174 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
175 	    repo);
176 	if (err)
177 		return err;
178 
179 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
180 	    repo);
181 }
182 
183 static void
184 tog_free_refs(void)
185 {
186 	if (tog_refs_idmap) {
187 		got_reflist_object_id_map_free(tog_refs_idmap);
188 		tog_refs_idmap = NULL;
189 	}
190 	got_ref_list_free(&tog_refs);
191 }
192 
193 static const struct got_error *
194 add_color(struct tog_colors *colors, const char *pattern,
195     int idx, short color)
196 {
197 	const struct got_error *err = NULL;
198 	struct tog_color *tc;
199 	int regerr = 0;
200 
201 	if (idx < 1 || idx > COLOR_PAIRS - 1)
202 		return NULL;
203 
204 	init_pair(idx, color, -1);
205 
206 	tc = calloc(1, sizeof(*tc));
207 	if (tc == NULL)
208 		return got_error_from_errno("calloc");
209 	regerr = regcomp(&tc->regex, pattern,
210 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
211 	if (regerr) {
212 		static char regerr_msg[512];
213 		static char err_msg[512];
214 		regerror(regerr, &tc->regex, regerr_msg,
215 		    sizeof(regerr_msg));
216 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
217 		    regerr_msg);
218 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
219 		free(tc);
220 		return err;
221 	}
222 	tc->colorpair = idx;
223 	STAILQ_INSERT_HEAD(colors, tc, entry);
224 	return NULL;
225 }
226 
227 static void
228 free_colors(struct tog_colors *colors)
229 {
230 	struct tog_color *tc;
231 
232 	while (!STAILQ_EMPTY(colors)) {
233 		tc = STAILQ_FIRST(colors);
234 		STAILQ_REMOVE_HEAD(colors, entry);
235 		regfree(&tc->regex);
236 		free(tc);
237 	}
238 }
239 
240 static struct tog_color *
241 get_color(struct tog_colors *colors, int colorpair)
242 {
243 	struct tog_color *tc = NULL;
244 
245 	STAILQ_FOREACH(tc, colors, entry) {
246 		if (tc->colorpair == colorpair)
247 			return tc;
248 	}
249 
250 	return NULL;
251 }
252 
253 static int
254 default_color_value(const char *envvar)
255 {
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
257 		return COLOR_MAGENTA;
258 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
259 		return COLOR_CYAN;
260 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
261 		return COLOR_YELLOW;
262 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
263 		return COLOR_GREEN;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
265 		return COLOR_MAGENTA;
266 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
271 		return COLOR_GREEN;
272 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
275 		return COLOR_CYAN;
276 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
279 		return COLOR_GREEN;
280 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
283 		return COLOR_YELLOW;
284 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
285 		return COLOR_CYAN;
286 
287 	return -1;
288 }
289 
290 static int
291 get_color_value(const char *envvar)
292 {
293 	const char *val = getenv(envvar);
294 
295 	if (val == NULL)
296 		return default_color_value(envvar);
297 
298 	if (strcasecmp(val, "black") == 0)
299 		return COLOR_BLACK;
300 	if (strcasecmp(val, "red") == 0)
301 		return COLOR_RED;
302 	if (strcasecmp(val, "green") == 0)
303 		return COLOR_GREEN;
304 	if (strcasecmp(val, "yellow") == 0)
305 		return COLOR_YELLOW;
306 	if (strcasecmp(val, "blue") == 0)
307 		return COLOR_BLUE;
308 	if (strcasecmp(val, "magenta") == 0)
309 		return COLOR_MAGENTA;
310 	if (strcasecmp(val, "cyan") == 0)
311 		return COLOR_CYAN;
312 	if (strcasecmp(val, "white") == 0)
313 		return COLOR_WHITE;
314 	if (strcasecmp(val, "default") == 0)
315 		return -1;
316 
317 	return default_color_value(envvar);
318 }
319 
320 
321 struct tog_diff_view_state {
322 	struct got_object_id *id1, *id2;
323 	const char *label1, *label2;
324 	FILE *f, *f1, *f2;
325 	int fd1, fd2;
326 	int first_displayed_line;
327 	int last_displayed_line;
328 	int eof;
329 	int diff_context;
330 	int ignore_whitespace;
331 	int force_text_diff;
332 	struct got_repository *repo;
333 	struct tog_colors colors;
334 	size_t nlines;
335 	off_t *line_offsets;
336 	int matched_line;
337 	int selected_line;
338 
339 	/* passed from log or blame view; may be NULL */
340 	struct tog_view *parent_view;
341 };
342 
343 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
344 static volatile sig_atomic_t tog_thread_error;
345 
346 struct tog_log_thread_args {
347 	pthread_cond_t need_commits;
348 	pthread_cond_t commit_loaded;
349 	int commits_needed;
350 	int load_all;
351 	struct got_commit_graph *graph;
352 	struct commit_queue *commits;
353 	const char *in_repo_path;
354 	struct got_object_id *start_id;
355 	struct got_repository *repo;
356 	int *pack_fds;
357 	int log_complete;
358 	sig_atomic_t *quit;
359 	struct commit_queue_entry **first_displayed_entry;
360 	struct commit_queue_entry **selected_entry;
361 	int *searching;
362 	int *search_next_done;
363 	regex_t *regex;
364 };
365 
366 struct tog_log_view_state {
367 	struct commit_queue commits;
368 	struct commit_queue_entry *first_displayed_entry;
369 	struct commit_queue_entry *last_displayed_entry;
370 	struct commit_queue_entry *selected_entry;
371 	int selected;
372 	char *in_repo_path;
373 	char *head_ref_name;
374 	int log_branches;
375 	struct got_repository *repo;
376 	struct got_object_id *start_id;
377 	sig_atomic_t quit;
378 	pthread_t thread;
379 	struct tog_log_thread_args thread_args;
380 	struct commit_queue_entry *matched_entry;
381 	struct commit_queue_entry *search_entry;
382 	struct tog_colors colors;
383 };
384 
385 #define TOG_COLOR_DIFF_MINUS		1
386 #define TOG_COLOR_DIFF_PLUS		2
387 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
388 #define TOG_COLOR_DIFF_META		4
389 #define TOG_COLOR_TREE_SUBMODULE	5
390 #define TOG_COLOR_TREE_SYMLINK		6
391 #define TOG_COLOR_TREE_DIRECTORY	7
392 #define TOG_COLOR_TREE_EXECUTABLE	8
393 #define TOG_COLOR_COMMIT		9
394 #define TOG_COLOR_AUTHOR		10
395 #define TOG_COLOR_DATE			11
396 #define TOG_COLOR_REFS_HEADS		12
397 #define TOG_COLOR_REFS_TAGS		13
398 #define TOG_COLOR_REFS_REMOTES		14
399 #define TOG_COLOR_REFS_BACKUP		15
400 
401 struct tog_blame_cb_args {
402 	struct tog_blame_line *lines; /* one per line */
403 	int nlines;
404 
405 	struct tog_view *view;
406 	struct got_object_id *commit_id;
407 	int *quit;
408 };
409 
410 struct tog_blame_thread_args {
411 	const char *path;
412 	struct got_repository *repo;
413 	struct tog_blame_cb_args *cb_args;
414 	int *complete;
415 	got_cancel_cb cancel_cb;
416 	void *cancel_arg;
417 };
418 
419 struct tog_blame {
420 	FILE *f;
421 	off_t filesize;
422 	struct tog_blame_line *lines;
423 	int nlines;
424 	off_t *line_offsets;
425 	pthread_t thread;
426 	struct tog_blame_thread_args thread_args;
427 	struct tog_blame_cb_args cb_args;
428 	const char *path;
429 	int *pack_fds;
430 };
431 
432 struct tog_blame_view_state {
433 	int first_displayed_line;
434 	int last_displayed_line;
435 	int selected_line;
436 	int last_diffed_line;
437 	int blame_complete;
438 	int eof;
439 	int done;
440 	struct got_object_id_queue blamed_commits;
441 	struct got_object_qid *blamed_commit;
442 	char *path;
443 	struct got_repository *repo;
444 	struct got_object_id *commit_id;
445 	struct tog_blame blame;
446 	int matched_line;
447 	struct tog_colors colors;
448 };
449 
450 struct tog_parent_tree {
451 	TAILQ_ENTRY(tog_parent_tree) entry;
452 	struct got_tree_object *tree;
453 	struct got_tree_entry *first_displayed_entry;
454 	struct got_tree_entry *selected_entry;
455 	int selected;
456 };
457 
458 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
459 
460 struct tog_tree_view_state {
461 	char *tree_label;
462 	struct got_object_id *commit_id;/* commit which this tree belongs to */
463 	struct got_tree_object *root;	/* the commit's root tree entry */
464 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
465 	struct got_tree_entry *first_displayed_entry;
466 	struct got_tree_entry *last_displayed_entry;
467 	struct got_tree_entry *selected_entry;
468 	int ndisplayed, selected, show_ids;
469 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
470 	char *head_ref_name;
471 	struct got_repository *repo;
472 	struct got_tree_entry *matched_entry;
473 	struct tog_colors colors;
474 };
475 
476 struct tog_reflist_entry {
477 	TAILQ_ENTRY(tog_reflist_entry) entry;
478 	struct got_reference *ref;
479 	int idx;
480 };
481 
482 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
483 
484 struct tog_ref_view_state {
485 	struct tog_reflist_head refs;
486 	struct tog_reflist_entry *first_displayed_entry;
487 	struct tog_reflist_entry *last_displayed_entry;
488 	struct tog_reflist_entry *selected_entry;
489 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
490 	struct got_repository *repo;
491 	struct tog_reflist_entry *matched_entry;
492 	struct tog_colors colors;
493 };
494 
495 /*
496  * We implement two types of views: parent views and child views.
497  *
498  * The 'Tab' key switches focus between a parent view and its child view.
499  * Child views are shown side-by-side to their parent view, provided
500  * there is enough screen estate.
501  *
502  * When a new view is opened from within a parent view, this new view
503  * becomes a child view of the parent view, replacing any existing child.
504  *
505  * When a new view is opened from within a child view, this new view
506  * becomes a parent view which will obscure the views below until the
507  * user quits the new parent view by typing 'q'.
508  *
509  * This list of views contains parent views only.
510  * Child views are only pointed to by their parent view.
511  */
512 TAILQ_HEAD(tog_view_list_head, tog_view);
513 
514 struct tog_view {
515 	TAILQ_ENTRY(tog_view) entry;
516 	WINDOW *window;
517 	PANEL *panel;
518 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
519 	int resized_y, resized_x; /* begin_y/x based on user resizing */
520 	int maxx, x; /* max column and current start column */
521 	int lines, cols; /* copies of LINES and COLS */
522 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
523 	int ch, count; /* current keymap and count prefix */
524 	int resize; /* set when in a resize event */
525 	int focussed; /* Only set on one parent or child view at a time. */
526 	int dying;
527 	struct tog_view *parent;
528 	struct tog_view *child;
529 
530 	/*
531 	 * This flag is initially set on parent views when a new child view
532 	 * is created. It gets toggled when the 'Tab' key switches focus
533 	 * between parent and child.
534 	 * The flag indicates whether focus should be passed on to our child
535 	 * view if this parent view gets picked for focus after another parent
536 	 * view was closed. This prevents child views from losing focus in such
537 	 * situations.
538 	 */
539 	int focus_child;
540 
541 	enum tog_view_mode mode;
542 	/* type-specific state */
543 	enum tog_view_type type;
544 	union {
545 		struct tog_diff_view_state diff;
546 		struct tog_log_view_state log;
547 		struct tog_blame_view_state blame;
548 		struct tog_tree_view_state tree;
549 		struct tog_ref_view_state ref;
550 	} state;
551 
552 	const struct got_error *(*show)(struct tog_view *);
553 	const struct got_error *(*input)(struct tog_view **,
554 	    struct tog_view *, int);
555 	const struct got_error *(*reset)(struct tog_view *);
556 	const struct got_error *(*close)(struct tog_view *);
557 
558 	const struct got_error *(*search_start)(struct tog_view *);
559 	const struct got_error *(*search_next)(struct tog_view *);
560 	int search_started;
561 	int searching;
562 #define TOG_SEARCH_FORWARD	1
563 #define TOG_SEARCH_BACKWARD	2
564 	int search_next_done;
565 #define TOG_SEARCH_HAVE_MORE	1
566 #define TOG_SEARCH_NO_MORE	2
567 #define TOG_SEARCH_HAVE_NONE	3
568 	regex_t regex;
569 	regmatch_t regmatch;
570 };
571 
572 static const struct got_error *open_diff_view(struct tog_view *,
573     struct got_object_id *, struct got_object_id *,
574     const char *, const char *, int, int, int, struct tog_view *,
575     struct got_repository *);
576 static const struct got_error *show_diff_view(struct tog_view *);
577 static const struct got_error *input_diff_view(struct tog_view **,
578     struct tog_view *, int);
579 static const struct got_error *reset_diff_view(struct tog_view *);
580 static const struct got_error* close_diff_view(struct tog_view *);
581 static const struct got_error *search_start_diff_view(struct tog_view *);
582 static const struct got_error *search_next_diff_view(struct tog_view *);
583 
584 static const struct got_error *open_log_view(struct tog_view *,
585     struct got_object_id *, struct got_repository *,
586     const char *, const char *, int);
587 static const struct got_error * show_log_view(struct tog_view *);
588 static const struct got_error *input_log_view(struct tog_view **,
589     struct tog_view *, int);
590 static const struct got_error *close_log_view(struct tog_view *);
591 static const struct got_error *search_start_log_view(struct tog_view *);
592 static const struct got_error *search_next_log_view(struct tog_view *);
593 
594 static const struct got_error *open_blame_view(struct tog_view *, char *,
595     struct got_object_id *, struct got_repository *);
596 static const struct got_error *show_blame_view(struct tog_view *);
597 static const struct got_error *input_blame_view(struct tog_view **,
598     struct tog_view *, int);
599 static const struct got_error *reset_blame_view(struct tog_view *);
600 static const struct got_error *close_blame_view(struct tog_view *);
601 static const struct got_error *search_start_blame_view(struct tog_view *);
602 static const struct got_error *search_next_blame_view(struct tog_view *);
603 
604 static const struct got_error *open_tree_view(struct tog_view *,
605     struct got_object_id *, const char *, struct got_repository *);
606 static const struct got_error *show_tree_view(struct tog_view *);
607 static const struct got_error *input_tree_view(struct tog_view **,
608     struct tog_view *, int);
609 static const struct got_error *close_tree_view(struct tog_view *);
610 static const struct got_error *search_start_tree_view(struct tog_view *);
611 static const struct got_error *search_next_tree_view(struct tog_view *);
612 
613 static const struct got_error *open_ref_view(struct tog_view *,
614     struct got_repository *);
615 static const struct got_error *show_ref_view(struct tog_view *);
616 static const struct got_error *input_ref_view(struct tog_view **,
617     struct tog_view *, int);
618 static const struct got_error *close_ref_view(struct tog_view *);
619 static const struct got_error *search_start_ref_view(struct tog_view *);
620 static const struct got_error *search_next_ref_view(struct tog_view *);
621 
622 static volatile sig_atomic_t tog_sigwinch_received;
623 static volatile sig_atomic_t tog_sigpipe_received;
624 static volatile sig_atomic_t tog_sigcont_received;
625 static volatile sig_atomic_t tog_sigint_received;
626 static volatile sig_atomic_t tog_sigterm_received;
627 
628 static void
629 tog_sigwinch(int signo)
630 {
631 	tog_sigwinch_received = 1;
632 }
633 
634 static void
635 tog_sigpipe(int signo)
636 {
637 	tog_sigpipe_received = 1;
638 }
639 
640 static void
641 tog_sigcont(int signo)
642 {
643 	tog_sigcont_received = 1;
644 }
645 
646 static void
647 tog_sigint(int signo)
648 {
649 	tog_sigint_received = 1;
650 }
651 
652 static void
653 tog_sigterm(int signo)
654 {
655 	tog_sigterm_received = 1;
656 }
657 
658 static int
659 tog_fatal_signal_received(void)
660 {
661 	return (tog_sigpipe_received ||
662 	    tog_sigint_received || tog_sigint_received);
663 }
664 
665 static const struct got_error *
666 view_close(struct tog_view *view)
667 {
668 	const struct got_error *err = NULL, *child_err = NULL;
669 
670 	if (view->child) {
671 		child_err = view_close(view->child);
672 		view->child = NULL;
673 	}
674 	if (view->close)
675 		err = view->close(view);
676 	if (view->panel)
677 		del_panel(view->panel);
678 	if (view->window)
679 		delwin(view->window);
680 	free(view);
681 	return err ? err : child_err;
682 }
683 
684 static struct tog_view *
685 view_open(int nlines, int ncols, int begin_y, int begin_x,
686     enum tog_view_type type)
687 {
688 	struct tog_view *view = calloc(1, sizeof(*view));
689 
690 	if (view == NULL)
691 		return NULL;
692 
693 	view->type = type;
694 	view->lines = LINES;
695 	view->cols = COLS;
696 	view->nlines = nlines ? nlines : LINES - begin_y;
697 	view->ncols = ncols ? ncols : COLS - begin_x;
698 	view->begin_y = begin_y;
699 	view->begin_x = begin_x;
700 	view->window = newwin(nlines, ncols, begin_y, begin_x);
701 	if (view->window == NULL) {
702 		view_close(view);
703 		return NULL;
704 	}
705 	view->panel = new_panel(view->window);
706 	if (view->panel == NULL ||
707 	    set_panel_userptr(view->panel, view) != OK) {
708 		view_close(view);
709 		return NULL;
710 	}
711 
712 	keypad(view->window, TRUE);
713 	return view;
714 }
715 
716 static int
717 view_split_begin_x(int begin_x)
718 {
719 	if (begin_x > 0 || COLS < 120)
720 		return 0;
721 	return (COLS - MAX(COLS / 2, 80));
722 }
723 
724 /* XXX Stub till we decide what to do. */
725 static int
726 view_split_begin_y(int lines)
727 {
728 	return lines * HSPLIT_SCALE;
729 }
730 
731 static const struct got_error *view_resize(struct tog_view *);
732 
733 static const struct got_error *
734 view_splitscreen(struct tog_view *view)
735 {
736 	const struct got_error *err = NULL;
737 
738 	if (!view->resize && view->mode == TOG_VIEW_SPLIT_HRZN) {
739 		if (view->resized_y && view->resized_y < view->lines)
740 			view->begin_y = view->resized_y;
741 		else
742 			view->begin_y = view_split_begin_y(view->nlines);
743 		view->begin_x = 0;
744 	} else if (!view->resize) {
745 		if (view->resized_x && view->resized_x < view->cols - 1 &&
746 		    view->cols > 119)
747 			view->begin_x = view->resized_x;
748 		else
749 			view->begin_x = view_split_begin_x(0);
750 		view->begin_y = 0;
751 	}
752 	view->nlines = LINES - view->begin_y;
753 	view->ncols = COLS - view->begin_x;
754 	view->lines = LINES;
755 	view->cols = COLS;
756 	err = view_resize(view);
757 	if (err)
758 		return err;
759 
760 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
761 		view->parent->nlines = view->begin_y;
762 
763 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
764 		return got_error_from_errno("mvwin");
765 
766 	return NULL;
767 }
768 
769 static const struct got_error *
770 view_fullscreen(struct tog_view *view)
771 {
772 	const struct got_error *err = NULL;
773 
774 	view->begin_x = 0;
775 	view->begin_y = view->resize ? view->begin_y : 0;
776 	view->nlines = view->resize ? view->nlines : LINES;
777 	view->ncols = COLS;
778 	view->lines = LINES;
779 	view->cols = COLS;
780 	err = view_resize(view);
781 	if (err)
782 		return err;
783 
784 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
785 		return got_error_from_errno("mvwin");
786 
787 	return NULL;
788 }
789 
790 static int
791 view_is_parent_view(struct tog_view *view)
792 {
793 	return view->parent == NULL;
794 }
795 
796 static int
797 view_is_splitscreen(struct tog_view *view)
798 {
799 	return view->begin_x > 0 || view->begin_y > 0;
800 }
801 
802 static int
803 view_is_fullscreen(struct tog_view *view)
804 {
805 	return view->nlines == LINES && view->ncols == COLS;
806 }
807 
808 static int
809 view_is_hsplit_top(struct tog_view *view)
810 {
811 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
812 	    view_is_splitscreen(view->child);
813 }
814 
815 static void
816 view_border(struct tog_view *view)
817 {
818 	PANEL *panel;
819 	const struct tog_view *view_above;
820 
821 	if (view->parent)
822 		return view_border(view->parent);
823 
824 	panel = panel_above(view->panel);
825 	if (panel == NULL)
826 		return;
827 
828 	view_above = panel_userptr(panel);
829 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
830 		mvwhline(view->window, view_above->begin_y - 1,
831 		    view->begin_x, got_locale_is_utf8() ?
832 		    ACS_HLINE : '-', view->ncols);
833 	else
834 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
835 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
836 }
837 
838 static const struct got_error *view_init_hsplit(struct tog_view *, int);
839 static const struct got_error *request_log_commits(struct tog_view *);
840 static const struct got_error *offset_selection_down(struct tog_view *);
841 static void offset_selection_up(struct tog_view *);
842 static void view_get_split(struct tog_view *, int *, int *);
843 
844 static const struct got_error *
845 view_resize(struct tog_view *view)
846 {
847 	const struct got_error	*err = NULL;
848 	int			 dif, nlines, ncols;
849 
850 	dif = LINES - view->lines;  /* line difference */
851 
852 	if (view->lines > LINES)
853 		nlines = view->nlines - (view->lines - LINES);
854 	else
855 		nlines = view->nlines + (LINES - view->lines);
856 	if (view->cols > COLS)
857 		ncols = view->ncols - (view->cols - COLS);
858 	else
859 		ncols = view->ncols + (COLS - view->cols);
860 
861 	if (view->child) {
862 		int hs = view->child->begin_y;
863 
864 		if (!view_is_fullscreen(view))
865 			view->child->begin_x = view_split_begin_x(view->begin_x);
866 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
867 		    view->child->begin_x == 0) {
868 			ncols = COLS;
869 
870 			view_fullscreen(view->child);
871 			if (view->child->focussed)
872 				show_panel(view->child->panel);
873 			else
874 				show_panel(view->panel);
875 		} else {
876 			ncols = view->child->begin_x;
877 
878 			view_splitscreen(view->child);
879 			show_panel(view->child->panel);
880 		}
881 		/*
882 		 * Request commits if terminal height was increased in a log
883 		 * view so we have enough commits loaded to populate the view.
884 		 */
885 		if (view->type == TOG_VIEW_LOG && dif > 0) {
886 			struct tog_log_view_state *ts = &view->state.log;
887 
888 			if (ts->commits.ncommits < ts->selected_entry->idx +
889 			    view->lines - ts->selected) {
890 				view->nscrolled = ts->selected_entry->idx +
891 				    view->lines - ts->selected -
892 				    ts->commits.ncommits + dif;
893 				err = request_log_commits(view);
894 				if (err)
895 					return err;
896 			}
897 		}
898 
899 		/*
900 		 * XXX This is ugly and needs to be moved into the above
901 		 * logic but "works" for now and my attempts at moving it
902 		 * break either 'tab' or 'F' key maps in horizontal splits.
903 		 */
904 		if (hs) {
905 			err = view_splitscreen(view->child);
906 			if (err)
907 				return err;
908 			if (dif < 0) { /* top split decreased */
909 				err = offset_selection_down(view);
910 				if (err)
911 					return err;
912 			}
913 			view_border(view);
914 			update_panels();
915 			doupdate();
916 			show_panel(view->child->panel);
917 			nlines = view->nlines;
918 		}
919 	} else if (view->parent == NULL)
920 		ncols = COLS;
921 
922 	if (wresize(view->window, nlines, ncols) == ERR)
923 		return got_error_from_errno("wresize");
924 	if (replace_panel(view->panel, view->window) == ERR)
925 		return got_error_from_errno("replace_panel");
926 	wclear(view->window);
927 
928 	view->nlines = nlines;
929 	view->ncols = ncols;
930 	view->lines = LINES;
931 	view->cols = COLS;
932 
933 	return NULL;
934 }
935 
936 static void
937 view_adjust_offset(struct tog_view *view, int n)
938 {
939 	if (n == 0)
940 		return;
941 
942 	if (view->parent && view->parent->offset) {
943 		if (view->parent->offset + n >= 0)
944 			view->parent->offset += n;
945 		else
946 			view->parent->offset = 0;
947 	} else if (view->offset) {
948 		if (view->offset - n >= 0)
949 			view->offset -= n;
950 		else
951 			view->offset = 0;
952 	}
953 }
954 
955 static const struct got_error *
956 view_resize_split(struct tog_view *view, int resize)
957 {
958 	const struct got_error	*err = NULL;
959 	struct tog_view		*v = NULL;
960 
961 	if (view->parent)
962 		v = view->parent;
963 	else
964 		v = view;
965 
966 	if (!v->child || !view_is_splitscreen(v->child))
967 		return NULL;
968 
969 	v->resize = v->child->resize = resize;  /* lock for resize event */
970 
971 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
972 		int y = v->child->begin_y;
973 
974 		if (v->child->resized_y)
975 			v->child->begin_y = v->child->resized_y;
976 		if (view->parent)
977 			v->child->begin_y -= resize;
978 		else
979 			v->child->begin_y += resize;
980 		if (v->child->begin_y < 3) {
981 			view->count = 0;
982 			v->child->begin_y = 3;
983 		} else if (v->child->begin_y > LINES - 1) {
984 			view->count = 0;
985 			v->child->begin_y = LINES - 1;
986 		}
987 		v->ncols = COLS;
988 		v->child->ncols = COLS;
989 		view_adjust_offset(view, resize);
990 		err = view_init_hsplit(v, v->child->begin_y);
991 		if (err)
992 			return err;
993 		v->child->resized_y = v->child->begin_y;
994 		if (y > v->child->begin_y)  /* split increased */
995 			v->child->nscrolled = y - v->child->begin_y;
996 	} else {
997 		if (v->child->resized_x)
998 			v->child->begin_x = v->child->resized_x;
999 		if (view->parent)
1000 			v->child->begin_x -= resize;
1001 		else
1002 			v->child->begin_x += resize;
1003 		if (v->child->begin_x < 11) {
1004 			view->count = 0;
1005 			v->child->begin_x = 11;
1006 		} else if (v->child->begin_x > COLS - 1) {
1007 			view->count = 0;
1008 			v->child->begin_x = COLS - 1;
1009 		}
1010 		v->child->resized_x = v->child->begin_x;
1011 	}
1012 
1013 	v->child->mode = v->mode;
1014 	v->child->nlines = v->lines - v->child->begin_y;
1015 	v->child->ncols = v->cols - v->child->begin_x;
1016 	v->focus_child = 1;
1017 
1018 	err = view_fullscreen(v);
1019 	if (err)
1020 		return err;
1021 	err = view_splitscreen(v->child);
1022 	if (err)
1023 		return err;
1024 
1025 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1026 		err = offset_selection_down(v->child);
1027 		if (err)
1028 			return err;
1029 	}
1030 
1031 	if (v->type == TOG_VIEW_LOG && v->nscrolled)
1032 		err = request_log_commits(v);
1033 	else if (v->child->type == TOG_VIEW_LOG && v->child->nscrolled)
1034 		err = request_log_commits(v->child);
1035 
1036 	v->resize = v->child->resize = 0;
1037 
1038 	return err;
1039 }
1040 
1041 static void
1042 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1043 {
1044 	struct tog_view *v = src->child ? src->child : src;
1045 
1046 	dst->resized_x = v->resized_x;
1047 	dst->resized_y = v->resized_y;
1048 }
1049 
1050 static const struct got_error *
1051 view_close_child(struct tog_view *view)
1052 {
1053 	const struct got_error *err = NULL;
1054 
1055 	if (view->child == NULL)
1056 		return NULL;
1057 
1058 	err = view_close(view->child);
1059 	view->child = NULL;
1060 	return err;
1061 }
1062 
1063 static const struct got_error *
1064 view_set_child(struct tog_view *view, struct tog_view *child)
1065 {
1066 	const struct got_error *err = NULL;
1067 
1068 	view->child = child;
1069 	child->parent = view;
1070 
1071 	err = view_resize(view);
1072 	if (err)
1073 		return err;
1074 
1075 	if (view->child->resized_x || view->child->resized_y)
1076 		err = view_resize_split(view, 0);
1077 
1078 	return err;
1079 }
1080 
1081 static void
1082 tog_resizeterm(void)
1083 {
1084 	int cols, lines;
1085 	struct winsize size;
1086 
1087 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1088 		cols = 80;     /* Default */
1089 		lines = 24;
1090 	} else {
1091 		cols = size.ws_col;
1092 		lines = size.ws_row;
1093 	}
1094 	resize_term(lines, cols);
1095 }
1096 
1097 static const struct got_error *
1098 view_search_start(struct tog_view *view)
1099 {
1100 	const struct got_error *err = NULL;
1101 	struct tog_view *v = view;
1102 	char pattern[1024];
1103 	int ret;
1104 
1105 	if (view->search_started) {
1106 		regfree(&view->regex);
1107 		view->searching = 0;
1108 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1109 	}
1110 	view->search_started = 0;
1111 
1112 	if (view->nlines < 1)
1113 		return NULL;
1114 
1115 	if (view_is_hsplit_top(view))
1116 		v = view->child;
1117 
1118 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1119 	wclrtoeol(v->window);
1120 
1121 	nodelay(view->window, FALSE);  /* block for search term input */
1122 	nocbreak();
1123 	echo();
1124 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1125 	wrefresh(v->window);
1126 	cbreak();
1127 	noecho();
1128 	nodelay(view->window, TRUE);
1129 	if (ret == ERR)
1130 		return NULL;
1131 
1132 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1133 		err = view->search_start(view);
1134 		if (err) {
1135 			regfree(&view->regex);
1136 			return err;
1137 		}
1138 		view->search_started = 1;
1139 		view->searching = TOG_SEARCH_FORWARD;
1140 		view->search_next_done = 0;
1141 		view->search_next(view);
1142 	}
1143 
1144 	return NULL;
1145 }
1146 
1147 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1148 static const struct got_error *
1149 switch_split(struct tog_view *view)
1150 {
1151 	const struct got_error	*err = NULL;
1152 	struct tog_view		*v = NULL;
1153 
1154 	if (view->parent)
1155 		v = view->parent;
1156 	else
1157 		v = view;
1158 
1159 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1160 		v->mode = TOG_VIEW_SPLIT_VERT;
1161 	else
1162 		v->mode = TOG_VIEW_SPLIT_HRZN;
1163 
1164 	if (!v->child)
1165 		return NULL;
1166 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1167 		v->mode = TOG_VIEW_SPLIT_NONE;
1168 
1169 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1170 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1171 		v->child->begin_y = v->child->resized_y;
1172 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1173 		v->child->begin_x = v->child->resized_x;
1174 
1175 
1176 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1177 		v->ncols = COLS;
1178 		v->child->ncols = COLS;
1179 		v->child->nscrolled = LINES - v->child->nlines;
1180 
1181 		err = view_init_hsplit(v, v->child->begin_y);
1182 		if (err)
1183 			return err;
1184 	}
1185 	v->child->mode = v->mode;
1186 	v->child->nlines = v->lines - v->child->begin_y;
1187 	v->focus_child = 1;
1188 
1189 	err = view_fullscreen(v);
1190 	if (err)
1191 		return err;
1192 	err = view_splitscreen(v->child);
1193 	if (err)
1194 		return err;
1195 
1196 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1197 		v->mode = TOG_VIEW_SPLIT_VERT;
1198 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1199 		err = offset_selection_down(v);
1200 		err = offset_selection_down(v->child);
1201 	} else {
1202 		offset_selection_up(v);
1203 		offset_selection_up(v->child);
1204 	}
1205 	if (v->type == TOG_VIEW_LOG && v->nscrolled)
1206 		err = request_log_commits(v);
1207 	else if (v->child->type == TOG_VIEW_LOG && v->child->nscrolled)
1208 		err = request_log_commits(v->child);
1209 
1210 	return err;
1211 }
1212 
1213 /*
1214  * Compute view->count from numeric input. Assign total to view->count and
1215  * return first non-numeric key entered.
1216  */
1217 static int
1218 get_compound_key(struct tog_view *view, int c)
1219 {
1220 	struct tog_view	*v = view;
1221 	int		 x, n = 0;
1222 
1223 	if (view_is_hsplit_top(view))
1224 		v = view->child;
1225 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1226 		v = view->parent;
1227 
1228 	view->count = 0;
1229 	cbreak();  /* block for input */
1230 	wmove(v->window, v->nlines - 1, 0);
1231 	wclrtoeol(v->window);
1232 	waddch(v->window, ':');
1233 
1234 	do {
1235 		x = getcurx(v->window);
1236 		if (x != ERR && x < view->ncols) {
1237 			waddch(v->window, c);
1238 			wrefresh(v->window);
1239 		}
1240 
1241 		/*
1242 		 * Don't overflow. Max valid request should be the greatest
1243 		 * between the longest and total lines; cap at 10 million.
1244 		 */
1245 		if (n >= 9999999)
1246 			n = 9999999;
1247 		else
1248 			n = n * 10 + (c - '0');
1249 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1250 
1251 	/* Massage excessive or inapplicable values at the input handler. */
1252 	view->count = n;
1253 
1254 	return c;
1255 }
1256 
1257 static const struct got_error *
1258 view_input(struct tog_view **new, int *done, struct tog_view *view,
1259     struct tog_view_list_head *views)
1260 {
1261 	const struct got_error *err = NULL;
1262 	struct tog_view *v;
1263 	int ch, errcode;
1264 
1265 	*new = NULL;
1266 
1267 	/* Clear "no matches" indicator. */
1268 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1269 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1270 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1271 		view->count = 0;
1272 	}
1273 
1274 	if (view->searching && !view->search_next_done) {
1275 		errcode = pthread_mutex_unlock(&tog_mutex);
1276 		if (errcode)
1277 			return got_error_set_errno(errcode,
1278 			    "pthread_mutex_unlock");
1279 		sched_yield();
1280 		errcode = pthread_mutex_lock(&tog_mutex);
1281 		if (errcode)
1282 			return got_error_set_errno(errcode,
1283 			    "pthread_mutex_lock");
1284 		view->search_next(view);
1285 		return NULL;
1286 	}
1287 
1288 	nodelay(view->window, FALSE);
1289 	/* Allow threads to make progress while we are waiting for input. */
1290 	errcode = pthread_mutex_unlock(&tog_mutex);
1291 	if (errcode)
1292 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1293 	/* If we have an unfinished count, let C-g or backspace abort. */
1294 	if (view->count && --view->count) {
1295 		cbreak();
1296 		nodelay(view->window, TRUE);
1297 		ch = wgetch(view->window);
1298 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1299 			view->count = 0;
1300 		else
1301 			ch = view->ch;
1302 	} else {
1303 		ch = wgetch(view->window);
1304 		if (ch >= '1' && ch  <= '9')
1305 			view->ch = ch = get_compound_key(view, ch);
1306 	}
1307 	errcode = pthread_mutex_lock(&tog_mutex);
1308 	if (errcode)
1309 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1310 	nodelay(view->window, TRUE);
1311 
1312 	if (tog_sigwinch_received || tog_sigcont_received) {
1313 		tog_resizeterm();
1314 		tog_sigwinch_received = 0;
1315 		tog_sigcont_received = 0;
1316 		TAILQ_FOREACH(v, views, entry) {
1317 			err = view_resize(v);
1318 			if (err)
1319 				return err;
1320 			err = v->input(new, v, KEY_RESIZE);
1321 			if (err)
1322 				return err;
1323 			if (v->child) {
1324 				err = view_resize(v->child);
1325 				if (err)
1326 					return err;
1327 				err = v->child->input(new, v->child,
1328 				    KEY_RESIZE);
1329 				if (err)
1330 					return err;
1331 				if (v->child->resized_x || v->child->resized_y) {
1332 					err = view_resize_split(v, 0);
1333 					if (err)
1334 						return err;
1335 				}
1336 			}
1337 		}
1338 	}
1339 
1340 	switch (ch) {
1341 	case '\t':
1342 		view->count = 0;
1343 		if (view->child) {
1344 			view->focussed = 0;
1345 			view->child->focussed = 1;
1346 			view->focus_child = 1;
1347 		} else if (view->parent) {
1348 			view->focussed = 0;
1349 			view->parent->focussed = 1;
1350 			view->parent->focus_child = 0;
1351 			if (!view_is_splitscreen(view)) {
1352 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1353 				    view->parent->type == TOG_VIEW_LOG) {
1354 					err = request_log_commits(view->parent);
1355 					if (err)
1356 						return err;
1357 				}
1358 				offset_selection_up(view->parent);
1359 				err = view_fullscreen(view->parent);
1360 				if (err)
1361 					return err;
1362 			}
1363 		}
1364 		break;
1365 	case 'q':
1366 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1367 			if (view->parent->type == TOG_VIEW_LOG) {
1368 				/* might need more commits to fill fullscreen */
1369 				err = request_log_commits(view->parent);
1370 				if (err)
1371 					break;
1372 			}
1373 			offset_selection_up(view->parent);
1374 		}
1375 		err = view->input(new, view, ch);
1376 		view->dying = 1;
1377 		break;
1378 	case 'Q':
1379 		*done = 1;
1380 		break;
1381 	case 'F':
1382 		view->count = 0;
1383 		if (view_is_parent_view(view)) {
1384 			if (view->child == NULL)
1385 				break;
1386 			if (view_is_splitscreen(view->child)) {
1387 				view->focussed = 0;
1388 				view->child->focussed = 1;
1389 				err = view_fullscreen(view->child);
1390 			} else {
1391 				err = view_splitscreen(view->child);
1392 				if (!err)
1393 					err = view_resize_split(view, 0);
1394 			}
1395 			if (err)
1396 				break;
1397 			err = view->child->input(new, view->child,
1398 			    KEY_RESIZE);
1399 		} else {
1400 			if (view_is_splitscreen(view)) {
1401 				view->parent->focussed = 0;
1402 				view->focussed = 1;
1403 				err = view_fullscreen(view);
1404 			} else {
1405 				err = view_splitscreen(view);
1406 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1407 					err = view_resize(view->parent);
1408 				if (!err)
1409 					err = view_resize_split(view, 0);
1410 			}
1411 			if (err)
1412 				break;
1413 			err = view->input(new, view, KEY_RESIZE);
1414 		}
1415 		if (err)
1416 			break;
1417 		if (view->type == TOG_VIEW_LOG) {
1418 			err = request_log_commits(view);
1419 			if (err)
1420 				break;
1421 		}
1422 		if (view->parent)
1423 			err = offset_selection_down(view->parent);
1424 		if (!err)
1425 			err = offset_selection_down(view);
1426 		break;
1427 	case 'S':
1428 		view->count = 0;
1429 		err = switch_split(view);
1430 		break;
1431 	case '-':
1432 		err = view_resize_split(view, -1);
1433 		break;
1434 	case '+':
1435 		err = view_resize_split(view, 1);
1436 		break;
1437 	case KEY_RESIZE:
1438 		break;
1439 	case '/':
1440 		view->count = 0;
1441 		if (view->search_start)
1442 			view_search_start(view);
1443 		else
1444 			err = view->input(new, view, ch);
1445 		break;
1446 	case 'N':
1447 	case 'n':
1448 		if (view->search_started && view->search_next) {
1449 			view->searching = (ch == 'n' ?
1450 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1451 			view->search_next_done = 0;
1452 			view->search_next(view);
1453 		} else
1454 			err = view->input(new, view, ch);
1455 		break;
1456 	case 'A':
1457 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1458 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1459 		else
1460 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1461 		TAILQ_FOREACH(v, views, entry) {
1462 			if (v->reset) {
1463 				err = v->reset(v);
1464 				if (err)
1465 					return err;
1466 			}
1467 			if (v->child && v->child->reset) {
1468 				err = v->child->reset(v->child);
1469 				if (err)
1470 					return err;
1471 			}
1472 		}
1473 		break;
1474 	default:
1475 		err = view->input(new, view, ch);
1476 		break;
1477 	}
1478 
1479 	return err;
1480 }
1481 
1482 static int
1483 view_needs_focus_indication(struct tog_view *view)
1484 {
1485 	if (view_is_parent_view(view)) {
1486 		if (view->child == NULL || view->child->focussed)
1487 			return 0;
1488 		if (!view_is_splitscreen(view->child))
1489 			return 0;
1490 	} else if (!view_is_splitscreen(view))
1491 		return 0;
1492 
1493 	return view->focussed;
1494 }
1495 
1496 static const struct got_error *
1497 view_loop(struct tog_view *view)
1498 {
1499 	const struct got_error *err = NULL;
1500 	struct tog_view_list_head views;
1501 	struct tog_view *new_view;
1502 	char *mode;
1503 	int fast_refresh = 10;
1504 	int done = 0, errcode;
1505 
1506 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1507 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1508 		view->mode = TOG_VIEW_SPLIT_VERT;
1509 	else
1510 		view->mode = TOG_VIEW_SPLIT_HRZN;
1511 
1512 	errcode = pthread_mutex_lock(&tog_mutex);
1513 	if (errcode)
1514 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1515 
1516 	TAILQ_INIT(&views);
1517 	TAILQ_INSERT_HEAD(&views, view, entry);
1518 
1519 	view->focussed = 1;
1520 	err = view->show(view);
1521 	if (err)
1522 		return err;
1523 	update_panels();
1524 	doupdate();
1525 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1526 	    !tog_fatal_signal_received()) {
1527 		/* Refresh fast during initialization, then become slower. */
1528 		if (fast_refresh && fast_refresh-- == 0)
1529 			halfdelay(10); /* switch to once per second */
1530 
1531 		err = view_input(&new_view, &done, view, &views);
1532 		if (err)
1533 			break;
1534 		if (view->dying) {
1535 			struct tog_view *v, *prev = NULL;
1536 
1537 			if (view_is_parent_view(view))
1538 				prev = TAILQ_PREV(view, tog_view_list_head,
1539 				    entry);
1540 			else if (view->parent)
1541 				prev = view->parent;
1542 
1543 			if (view->parent) {
1544 				view->parent->child = NULL;
1545 				view->parent->focus_child = 0;
1546 				/* Restore fullscreen line height. */
1547 				view->parent->nlines = view->parent->lines;
1548 				err = view_resize(view->parent);
1549 				if (err)
1550 					break;
1551 				/* Make resized splits persist. */
1552 				view_transfer_size(view->parent, view);
1553 			} else
1554 				TAILQ_REMOVE(&views, view, entry);
1555 
1556 			err = view_close(view);
1557 			if (err)
1558 				goto done;
1559 
1560 			view = NULL;
1561 			TAILQ_FOREACH(v, &views, entry) {
1562 				if (v->focussed)
1563 					break;
1564 			}
1565 			if (view == NULL && new_view == NULL) {
1566 				/* No view has focus. Try to pick one. */
1567 				if (prev)
1568 					view = prev;
1569 				else if (!TAILQ_EMPTY(&views)) {
1570 					view = TAILQ_LAST(&views,
1571 					    tog_view_list_head);
1572 				}
1573 				if (view) {
1574 					if (view->focus_child) {
1575 						view->child->focussed = 1;
1576 						view = view->child;
1577 					} else
1578 						view->focussed = 1;
1579 				}
1580 			}
1581 		}
1582 		if (new_view) {
1583 			struct tog_view *v, *t;
1584 			/* Only allow one parent view per type. */
1585 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1586 				if (v->type != new_view->type)
1587 					continue;
1588 				TAILQ_REMOVE(&views, v, entry);
1589 				err = view_close(v);
1590 				if (err)
1591 					goto done;
1592 				break;
1593 			}
1594 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1595 			view = new_view;
1596 		}
1597 		if (view) {
1598 			if (view_is_parent_view(view)) {
1599 				if (view->child && view->child->focussed)
1600 					view = view->child;
1601 			} else {
1602 				if (view->parent && view->parent->focussed)
1603 					view = view->parent;
1604 			}
1605 			show_panel(view->panel);
1606 			if (view->child && view_is_splitscreen(view->child))
1607 				show_panel(view->child->panel);
1608 			if (view->parent && view_is_splitscreen(view)) {
1609 				err = view->parent->show(view->parent);
1610 				if (err)
1611 					goto done;
1612 			}
1613 			err = view->show(view);
1614 			if (err)
1615 				goto done;
1616 			if (view->child) {
1617 				err = view->child->show(view->child);
1618 				if (err)
1619 					goto done;
1620 			}
1621 			update_panels();
1622 			doupdate();
1623 		}
1624 	}
1625 done:
1626 	while (!TAILQ_EMPTY(&views)) {
1627 		const struct got_error *close_err;
1628 		view = TAILQ_FIRST(&views);
1629 		TAILQ_REMOVE(&views, view, entry);
1630 		close_err = view_close(view);
1631 		if (close_err && err == NULL)
1632 			err = close_err;
1633 	}
1634 
1635 	errcode = pthread_mutex_unlock(&tog_mutex);
1636 	if (errcode && err == NULL)
1637 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1638 
1639 	return err;
1640 }
1641 
1642 __dead static void
1643 usage_log(void)
1644 {
1645 	endwin();
1646 	fprintf(stderr,
1647 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1648 	    getprogname());
1649 	exit(1);
1650 }
1651 
1652 /* Create newly allocated wide-character string equivalent to a byte string. */
1653 static const struct got_error *
1654 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1655 {
1656 	char *vis = NULL;
1657 	const struct got_error *err = NULL;
1658 
1659 	*ws = NULL;
1660 	*wlen = mbstowcs(NULL, s, 0);
1661 	if (*wlen == (size_t)-1) {
1662 		int vislen;
1663 		if (errno != EILSEQ)
1664 			return got_error_from_errno("mbstowcs");
1665 
1666 		/* byte string invalid in current encoding; try to "fix" it */
1667 		err = got_mbsavis(&vis, &vislen, s);
1668 		if (err)
1669 			return err;
1670 		*wlen = mbstowcs(NULL, vis, 0);
1671 		if (*wlen == (size_t)-1) {
1672 			err = got_error_from_errno("mbstowcs"); /* give up */
1673 			goto done;
1674 		}
1675 	}
1676 
1677 	*ws = calloc(*wlen + 1, sizeof(**ws));
1678 	if (*ws == NULL) {
1679 		err = got_error_from_errno("calloc");
1680 		goto done;
1681 	}
1682 
1683 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1684 		err = got_error_from_errno("mbstowcs");
1685 done:
1686 	free(vis);
1687 	if (err) {
1688 		free(*ws);
1689 		*ws = NULL;
1690 		*wlen = 0;
1691 	}
1692 	return err;
1693 }
1694 
1695 static const struct got_error *
1696 expand_tab(char **ptr, const char *src)
1697 {
1698 	char	*dst;
1699 	size_t	 len, n, idx = 0, sz = 0;
1700 
1701 	*ptr = NULL;
1702 	n = len = strlen(src);
1703 	dst = malloc(n + 1);
1704 	if (dst == NULL)
1705 		return got_error_from_errno("malloc");
1706 
1707 	while (idx < len && src[idx]) {
1708 		const char c = src[idx];
1709 
1710 		if (c == '\t') {
1711 			size_t nb = TABSIZE - sz % TABSIZE;
1712 			char *p;
1713 
1714 			p = realloc(dst, n + nb);
1715 			if (p == NULL) {
1716 				free(dst);
1717 				return got_error_from_errno("realloc");
1718 
1719 			}
1720 			dst = p;
1721 			n += nb;
1722 			memset(dst + sz, ' ', nb);
1723 			sz += nb;
1724 		} else
1725 			dst[sz++] = src[idx];
1726 		++idx;
1727 	}
1728 
1729 	dst[sz] = '\0';
1730 	*ptr = dst;
1731 	return NULL;
1732 }
1733 
1734 /*
1735  * Advance at most n columns from wline starting at offset off.
1736  * Return the index to the first character after the span operation.
1737  * Return the combined column width of all spanned wide character in
1738  * *rcol.
1739  */
1740 static int
1741 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1742 {
1743 	int width, i, cols = 0;
1744 
1745 	if (n == 0) {
1746 		*rcol = cols;
1747 		return off;
1748 	}
1749 
1750 	for (i = off; wline[i] != L'\0'; ++i) {
1751 		if (wline[i] == L'\t')
1752 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1753 		else
1754 			width = wcwidth(wline[i]);
1755 
1756 		if (width == -1) {
1757 			width = 1;
1758 			wline[i] = L'.';
1759 		}
1760 
1761 		if (cols + width > n)
1762 			break;
1763 		cols += width;
1764 	}
1765 
1766 	*rcol = cols;
1767 	return i;
1768 }
1769 
1770 /*
1771  * Format a line for display, ensuring that it won't overflow a width limit.
1772  * With scrolling, the width returned refers to the scrolled version of the
1773  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1774  */
1775 static const struct got_error *
1776 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1777     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1778 {
1779 	const struct got_error *err = NULL;
1780 	int cols;
1781 	wchar_t *wline = NULL;
1782 	char *exstr = NULL;
1783 	size_t wlen;
1784 	int i, scrollx;
1785 
1786 	*wlinep = NULL;
1787 	*widthp = 0;
1788 
1789 	if (expand) {
1790 		err = expand_tab(&exstr, line);
1791 		if (err)
1792 			return err;
1793 	}
1794 
1795 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1796 	free(exstr);
1797 	if (err)
1798 		return err;
1799 
1800 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1801 
1802 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1803 		wline[wlen - 1] = L'\0';
1804 		wlen--;
1805 	}
1806 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1807 		wline[wlen - 1] = L'\0';
1808 		wlen--;
1809 	}
1810 
1811 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1812 	wline[i] = L'\0';
1813 
1814 	if (widthp)
1815 		*widthp = cols;
1816 	if (scrollxp)
1817 		*scrollxp = scrollx;
1818 	if (err)
1819 		free(wline);
1820 	else
1821 		*wlinep = wline;
1822 	return err;
1823 }
1824 
1825 static const struct got_error*
1826 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1827     struct got_object_id *id, struct got_repository *repo)
1828 {
1829 	static const struct got_error *err = NULL;
1830 	struct got_reflist_entry *re;
1831 	char *s;
1832 	const char *name;
1833 
1834 	*refs_str = NULL;
1835 
1836 	TAILQ_FOREACH(re, refs, entry) {
1837 		struct got_tag_object *tag = NULL;
1838 		struct got_object_id *ref_id;
1839 		int cmp;
1840 
1841 		name = got_ref_get_name(re->ref);
1842 		if (strcmp(name, GOT_REF_HEAD) == 0)
1843 			continue;
1844 		if (strncmp(name, "refs/", 5) == 0)
1845 			name += 5;
1846 		if (strncmp(name, "got/", 4) == 0 &&
1847 		    strncmp(name, "got/backup/", 11) != 0)
1848 			continue;
1849 		if (strncmp(name, "heads/", 6) == 0)
1850 			name += 6;
1851 		if (strncmp(name, "remotes/", 8) == 0) {
1852 			name += 8;
1853 			s = strstr(name, "/" GOT_REF_HEAD);
1854 			if (s != NULL && s[strlen(s)] == '\0')
1855 				continue;
1856 		}
1857 		err = got_ref_resolve(&ref_id, repo, re->ref);
1858 		if (err)
1859 			break;
1860 		if (strncmp(name, "tags/", 5) == 0) {
1861 			err = got_object_open_as_tag(&tag, repo, ref_id);
1862 			if (err) {
1863 				if (err->code != GOT_ERR_OBJ_TYPE) {
1864 					free(ref_id);
1865 					break;
1866 				}
1867 				/* Ref points at something other than a tag. */
1868 				err = NULL;
1869 				tag = NULL;
1870 			}
1871 		}
1872 		cmp = got_object_id_cmp(tag ?
1873 		    got_object_tag_get_object_id(tag) : ref_id, id);
1874 		free(ref_id);
1875 		if (tag)
1876 			got_object_tag_close(tag);
1877 		if (cmp != 0)
1878 			continue;
1879 		s = *refs_str;
1880 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1881 		    s ? ", " : "", name) == -1) {
1882 			err = got_error_from_errno("asprintf");
1883 			free(s);
1884 			*refs_str = NULL;
1885 			break;
1886 		}
1887 		free(s);
1888 	}
1889 
1890 	return err;
1891 }
1892 
1893 static const struct got_error *
1894 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1895     int col_tab_align)
1896 {
1897 	char *smallerthan;
1898 
1899 	smallerthan = strchr(author, '<');
1900 	if (smallerthan && smallerthan[1] != '\0')
1901 		author = smallerthan + 1;
1902 	author[strcspn(author, "@>")] = '\0';
1903 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1904 	    col_tab_align, 0);
1905 }
1906 
1907 static const struct got_error *
1908 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1909     struct got_object_id *id, const size_t date_display_cols,
1910     int author_display_cols)
1911 {
1912 	struct tog_log_view_state *s = &view->state.log;
1913 	const struct got_error *err = NULL;
1914 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1915 	char *logmsg0 = NULL, *logmsg = NULL;
1916 	char *author = NULL;
1917 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1918 	int author_width, logmsg_width;
1919 	char *newline, *line = NULL;
1920 	int col, limit, scrollx;
1921 	const int avail = view->ncols;
1922 	struct tm tm;
1923 	time_t committer_time;
1924 	struct tog_color *tc;
1925 
1926 	committer_time = got_object_commit_get_committer_time(commit);
1927 	if (gmtime_r(&committer_time, &tm) == NULL)
1928 		return got_error_from_errno("gmtime_r");
1929 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1930 		return got_error(GOT_ERR_NO_SPACE);
1931 
1932 	if (avail <= date_display_cols)
1933 		limit = MIN(sizeof(datebuf) - 1, avail);
1934 	else
1935 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1936 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1937 	if (tc)
1938 		wattr_on(view->window,
1939 		    COLOR_PAIR(tc->colorpair), NULL);
1940 	waddnstr(view->window, datebuf, limit);
1941 	if (tc)
1942 		wattr_off(view->window,
1943 		    COLOR_PAIR(tc->colorpair), NULL);
1944 	col = limit;
1945 	if (col > avail)
1946 		goto done;
1947 
1948 	if (avail >= 120) {
1949 		char *id_str;
1950 		err = got_object_id_str(&id_str, id);
1951 		if (err)
1952 			goto done;
1953 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1954 		if (tc)
1955 			wattr_on(view->window,
1956 			    COLOR_PAIR(tc->colorpair), NULL);
1957 		wprintw(view->window, "%.8s ", id_str);
1958 		if (tc)
1959 			wattr_off(view->window,
1960 			    COLOR_PAIR(tc->colorpair), NULL);
1961 		free(id_str);
1962 		col += 9;
1963 		if (col > avail)
1964 			goto done;
1965 	}
1966 
1967 	author = strdup(got_object_commit_get_author(commit));
1968 	if (author == NULL) {
1969 		err = got_error_from_errno("strdup");
1970 		goto done;
1971 	}
1972 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1973 	if (err)
1974 		goto done;
1975 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1976 	if (tc)
1977 		wattr_on(view->window,
1978 		    COLOR_PAIR(tc->colorpair), NULL);
1979 	waddwstr(view->window, wauthor);
1980 	if (tc)
1981 		wattr_off(view->window,
1982 		    COLOR_PAIR(tc->colorpair), NULL);
1983 	col += author_width;
1984 	while (col < avail && author_width < author_display_cols + 2) {
1985 		waddch(view->window, ' ');
1986 		col++;
1987 		author_width++;
1988 	}
1989 	if (col > avail)
1990 		goto done;
1991 
1992 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1993 	if (err)
1994 		goto done;
1995 	logmsg = logmsg0;
1996 	while (*logmsg == '\n')
1997 		logmsg++;
1998 	newline = strchr(logmsg, '\n');
1999 	if (newline)
2000 		*newline = '\0';
2001 	limit = avail - col;
2002 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2003 		limit--;	/* for the border */
2004 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2005 	    limit, col, 1);
2006 	if (err)
2007 		goto done;
2008 	waddwstr(view->window, &wlogmsg[scrollx]);
2009 	col += MAX(logmsg_width, 0);
2010 	while (col < avail) {
2011 		waddch(view->window, ' ');
2012 		col++;
2013 	}
2014 done:
2015 	free(logmsg0);
2016 	free(wlogmsg);
2017 	free(author);
2018 	free(wauthor);
2019 	free(line);
2020 	return err;
2021 }
2022 
2023 static struct commit_queue_entry *
2024 alloc_commit_queue_entry(struct got_commit_object *commit,
2025     struct got_object_id *id)
2026 {
2027 	struct commit_queue_entry *entry;
2028 
2029 	entry = calloc(1, sizeof(*entry));
2030 	if (entry == NULL)
2031 		return NULL;
2032 
2033 	entry->id = id;
2034 	entry->commit = commit;
2035 	return entry;
2036 }
2037 
2038 static void
2039 pop_commit(struct commit_queue *commits)
2040 {
2041 	struct commit_queue_entry *entry;
2042 
2043 	entry = TAILQ_FIRST(&commits->head);
2044 	TAILQ_REMOVE(&commits->head, entry, entry);
2045 	got_object_commit_close(entry->commit);
2046 	commits->ncommits--;
2047 	/* Don't free entry->id! It is owned by the commit graph. */
2048 	free(entry);
2049 }
2050 
2051 static void
2052 free_commits(struct commit_queue *commits)
2053 {
2054 	while (!TAILQ_EMPTY(&commits->head))
2055 		pop_commit(commits);
2056 }
2057 
2058 static const struct got_error *
2059 match_commit(int *have_match, struct got_object_id *id,
2060     struct got_commit_object *commit, regex_t *regex)
2061 {
2062 	const struct got_error *err = NULL;
2063 	regmatch_t regmatch;
2064 	char *id_str = NULL, *logmsg = NULL;
2065 
2066 	*have_match = 0;
2067 
2068 	err = got_object_id_str(&id_str, id);
2069 	if (err)
2070 		return err;
2071 
2072 	err = got_object_commit_get_logmsg(&logmsg, commit);
2073 	if (err)
2074 		goto done;
2075 
2076 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2077 	    &regmatch, 0) == 0 ||
2078 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2079 	    &regmatch, 0) == 0 ||
2080 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2081 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2082 		*have_match = 1;
2083 done:
2084 	free(id_str);
2085 	free(logmsg);
2086 	return err;
2087 }
2088 
2089 static const struct got_error *
2090 queue_commits(struct tog_log_thread_args *a)
2091 {
2092 	const struct got_error *err = NULL;
2093 
2094 	/*
2095 	 * We keep all commits open throughout the lifetime of the log
2096 	 * view in order to avoid having to re-fetch commits from disk
2097 	 * while updating the display.
2098 	 */
2099 	do {
2100 		struct got_object_id *id;
2101 		struct got_commit_object *commit;
2102 		struct commit_queue_entry *entry;
2103 		int errcode;
2104 
2105 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2106 		    NULL, NULL);
2107 		if (err || id == NULL)
2108 			break;
2109 
2110 		err = got_object_open_as_commit(&commit, a->repo, id);
2111 		if (err)
2112 			break;
2113 		entry = alloc_commit_queue_entry(commit, id);
2114 		if (entry == NULL) {
2115 			err = got_error_from_errno("alloc_commit_queue_entry");
2116 			break;
2117 		}
2118 
2119 		errcode = pthread_mutex_lock(&tog_mutex);
2120 		if (errcode) {
2121 			err = got_error_set_errno(errcode,
2122 			    "pthread_mutex_lock");
2123 			break;
2124 		}
2125 
2126 		entry->idx = a->commits->ncommits;
2127 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2128 		a->commits->ncommits++;
2129 
2130 		if (*a->searching == TOG_SEARCH_FORWARD &&
2131 		    !*a->search_next_done) {
2132 			int have_match;
2133 			err = match_commit(&have_match, id, commit, a->regex);
2134 			if (err)
2135 				break;
2136 			if (have_match)
2137 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2138 		}
2139 
2140 		errcode = pthread_mutex_unlock(&tog_mutex);
2141 		if (errcode && err == NULL)
2142 			err = got_error_set_errno(errcode,
2143 			    "pthread_mutex_unlock");
2144 		if (err)
2145 			break;
2146 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2147 
2148 	return err;
2149 }
2150 
2151 static void
2152 select_commit(struct tog_log_view_state *s)
2153 {
2154 	struct commit_queue_entry *entry;
2155 	int ncommits = 0;
2156 
2157 	entry = s->first_displayed_entry;
2158 	while (entry) {
2159 		if (ncommits == s->selected) {
2160 			s->selected_entry = entry;
2161 			break;
2162 		}
2163 		entry = TAILQ_NEXT(entry, entry);
2164 		ncommits++;
2165 	}
2166 }
2167 
2168 static const struct got_error *
2169 draw_commits(struct tog_view *view)
2170 {
2171 	const struct got_error *err = NULL;
2172 	struct tog_log_view_state *s = &view->state.log;
2173 	struct commit_queue_entry *entry = s->selected_entry;
2174 	const int limit = view->nlines;
2175 	int width;
2176 	int ncommits, author_cols = 4;
2177 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2178 	char *refs_str = NULL;
2179 	wchar_t *wline;
2180 	struct tog_color *tc;
2181 	static const size_t date_display_cols = 12;
2182 
2183 	if (s->selected_entry &&
2184 	    !(view->searching && view->search_next_done == 0)) {
2185 		struct got_reflist_head *refs;
2186 		err = got_object_id_str(&id_str, s->selected_entry->id);
2187 		if (err)
2188 			return err;
2189 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2190 		    s->selected_entry->id);
2191 		if (refs) {
2192 			err = build_refs_str(&refs_str, refs,
2193 			    s->selected_entry->id, s->repo);
2194 			if (err)
2195 				goto done;
2196 		}
2197 	}
2198 
2199 	if (s->thread_args.commits_needed == 0)
2200 		halfdelay(10); /* disable fast refresh */
2201 
2202 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2203 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2204 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2205 		    (view->searching && !view->search_next_done) ?
2206 		    "searching..." : "loading...") == -1) {
2207 			err = got_error_from_errno("asprintf");
2208 			goto done;
2209 		}
2210 	} else {
2211 		const char *search_str = NULL;
2212 
2213 		if (view->searching) {
2214 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2215 				search_str = "no more matches";
2216 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2217 				search_str = "no matches found";
2218 			else if (!view->search_next_done)
2219 				search_str = "searching...";
2220 		}
2221 
2222 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2223 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2224 		    search_str ? search_str :
2225 		    (refs_str ? refs_str : "")) == -1) {
2226 			err = got_error_from_errno("asprintf");
2227 			goto done;
2228 		}
2229 	}
2230 
2231 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2232 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2233 		    "........................................",
2234 		    s->in_repo_path, ncommits_str) == -1) {
2235 			err = got_error_from_errno("asprintf");
2236 			header = NULL;
2237 			goto done;
2238 		}
2239 	} else if (asprintf(&header, "commit %s%s",
2240 	    id_str ? id_str : "........................................",
2241 	    ncommits_str) == -1) {
2242 		err = got_error_from_errno("asprintf");
2243 		header = NULL;
2244 		goto done;
2245 	}
2246 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2247 	if (err)
2248 		goto done;
2249 
2250 	werase(view->window);
2251 
2252 	if (view_needs_focus_indication(view))
2253 		wstandout(view->window);
2254 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2255 	if (tc)
2256 		wattr_on(view->window,
2257 		    COLOR_PAIR(tc->colorpair), NULL);
2258 	waddwstr(view->window, wline);
2259 	if (tc)
2260 		wattr_off(view->window,
2261 		    COLOR_PAIR(tc->colorpair), NULL);
2262 	while (width < view->ncols) {
2263 		waddch(view->window, ' ');
2264 		width++;
2265 	}
2266 	if (view_needs_focus_indication(view))
2267 		wstandend(view->window);
2268 	free(wline);
2269 	if (limit <= 1)
2270 		goto done;
2271 
2272 	/* Grow author column size if necessary, and set view->maxx. */
2273 	entry = s->first_displayed_entry;
2274 	ncommits = 0;
2275 	view->maxx = 0;
2276 	while (entry) {
2277 		char *author, *eol, *msg, *msg0;
2278 		wchar_t *wauthor, *wmsg;
2279 		int width;
2280 		if (ncommits >= limit - 1)
2281 			break;
2282 		author = strdup(got_object_commit_get_author(entry->commit));
2283 		if (author == NULL) {
2284 			err = got_error_from_errno("strdup");
2285 			goto done;
2286 		}
2287 		err = format_author(&wauthor, &width, author, COLS,
2288 		    date_display_cols);
2289 		if (author_cols < width)
2290 			author_cols = width;
2291 		free(wauthor);
2292 		free(author);
2293 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
2294 		if (err)
2295 			goto done;
2296 		msg = msg0;
2297 		while (*msg == '\n')
2298 			++msg;
2299 		if ((eol = strchr(msg, '\n')))
2300 			*eol = '\0';
2301 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2302 		    date_display_cols + author_cols, 0);
2303 		if (err)
2304 			goto done;
2305 		view->maxx = MAX(view->maxx, width);
2306 		free(msg0);
2307 		free(wmsg);
2308 		ncommits++;
2309 		entry = TAILQ_NEXT(entry, entry);
2310 	}
2311 
2312 	entry = s->first_displayed_entry;
2313 	s->last_displayed_entry = s->first_displayed_entry;
2314 	ncommits = 0;
2315 	while (entry) {
2316 		if (ncommits >= limit - 1)
2317 			break;
2318 		if (ncommits == s->selected)
2319 			wstandout(view->window);
2320 		err = draw_commit(view, entry->commit, entry->id,
2321 		    date_display_cols, author_cols);
2322 		if (ncommits == s->selected)
2323 			wstandend(view->window);
2324 		if (err)
2325 			goto done;
2326 		ncommits++;
2327 		s->last_displayed_entry = entry;
2328 		entry = TAILQ_NEXT(entry, entry);
2329 	}
2330 
2331 	view_border(view);
2332 done:
2333 	free(id_str);
2334 	free(refs_str);
2335 	free(ncommits_str);
2336 	free(header);
2337 	return err;
2338 }
2339 
2340 static void
2341 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2342 {
2343 	struct commit_queue_entry *entry;
2344 	int nscrolled = 0;
2345 
2346 	entry = TAILQ_FIRST(&s->commits.head);
2347 	if (s->first_displayed_entry == entry)
2348 		return;
2349 
2350 	entry = s->first_displayed_entry;
2351 	while (entry && nscrolled < maxscroll) {
2352 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2353 		if (entry) {
2354 			s->first_displayed_entry = entry;
2355 			nscrolled++;
2356 		}
2357 	}
2358 }
2359 
2360 static const struct got_error *
2361 trigger_log_thread(struct tog_view *view, int wait)
2362 {
2363 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2364 	int errcode;
2365 
2366 	halfdelay(1); /* fast refresh while loading commits */
2367 
2368 	while (!ta->log_complete && !tog_thread_error &&
2369 	    (ta->commits_needed > 0 || ta->load_all)) {
2370 		/* Wake the log thread. */
2371 		errcode = pthread_cond_signal(&ta->need_commits);
2372 		if (errcode)
2373 			return got_error_set_errno(errcode,
2374 			    "pthread_cond_signal");
2375 
2376 		/*
2377 		 * The mutex will be released while the view loop waits
2378 		 * in wgetch(), at which time the log thread will run.
2379 		 */
2380 		if (!wait)
2381 			break;
2382 
2383 		/* Display progress update in log view. */
2384 		show_log_view(view);
2385 		update_panels();
2386 		doupdate();
2387 
2388 		/* Wait right here while next commit is being loaded. */
2389 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2390 		if (errcode)
2391 			return got_error_set_errno(errcode,
2392 			    "pthread_cond_wait");
2393 
2394 		/* Display progress update in log view. */
2395 		show_log_view(view);
2396 		update_panels();
2397 		doupdate();
2398 	}
2399 
2400 	return NULL;
2401 }
2402 
2403 static const struct got_error *
2404 request_log_commits(struct tog_view *view)
2405 {
2406 	struct tog_log_view_state	*state = &view->state.log;
2407 	const struct got_error		*err = NULL;
2408 
2409 	state->thread_args.commits_needed += view->nscrolled;
2410 	err = trigger_log_thread(view, 1);
2411 	view->nscrolled = 0;
2412 
2413 	return err;
2414 }
2415 
2416 static const struct got_error *
2417 log_scroll_down(struct tog_view *view, int maxscroll)
2418 {
2419 	struct tog_log_view_state *s = &view->state.log;
2420 	const struct got_error *err = NULL;
2421 	struct commit_queue_entry *pentry;
2422 	int nscrolled = 0, ncommits_needed;
2423 
2424 	if (s->last_displayed_entry == NULL)
2425 		return NULL;
2426 
2427 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2428 	if (s->commits.ncommits < ncommits_needed &&
2429 	    !s->thread_args.log_complete) {
2430 		/*
2431 		 * Ask the log thread for required amount of commits.
2432 		 */
2433 		s->thread_args.commits_needed += maxscroll;
2434 		err = trigger_log_thread(view, 1);
2435 		if (err)
2436 			return err;
2437 	}
2438 
2439 	do {
2440 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2441 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2442 			break;
2443 
2444 		s->last_displayed_entry = pentry ?
2445 		    pentry : s->last_displayed_entry;;
2446 
2447 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2448 		if (pentry == NULL)
2449 			break;
2450 		s->first_displayed_entry = pentry;
2451 	} while (++nscrolled < maxscroll);
2452 
2453 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
2454 		view->nscrolled += nscrolled;
2455 	else
2456 		view->nscrolled = 0;
2457 
2458 	return err;
2459 }
2460 
2461 static const struct got_error *
2462 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2463     struct got_commit_object *commit, struct got_object_id *commit_id,
2464     struct tog_view *log_view, struct got_repository *repo)
2465 {
2466 	const struct got_error *err;
2467 	struct got_object_qid *parent_id;
2468 	struct tog_view *diff_view;
2469 
2470 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2471 	if (diff_view == NULL)
2472 		return got_error_from_errno("view_open");
2473 
2474 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2475 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2476 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2477 	if (err == NULL)
2478 		*new_view = diff_view;
2479 	return err;
2480 }
2481 
2482 static const struct got_error *
2483 tree_view_visit_subtree(struct tog_tree_view_state *s,
2484     struct got_tree_object *subtree)
2485 {
2486 	struct tog_parent_tree *parent;
2487 
2488 	parent = calloc(1, sizeof(*parent));
2489 	if (parent == NULL)
2490 		return got_error_from_errno("calloc");
2491 
2492 	parent->tree = s->tree;
2493 	parent->first_displayed_entry = s->first_displayed_entry;
2494 	parent->selected_entry = s->selected_entry;
2495 	parent->selected = s->selected;
2496 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2497 	s->tree = subtree;
2498 	s->selected = 0;
2499 	s->first_displayed_entry = NULL;
2500 	return NULL;
2501 }
2502 
2503 static const struct got_error *
2504 tree_view_walk_path(struct tog_tree_view_state *s,
2505     struct got_commit_object *commit, const char *path)
2506 {
2507 	const struct got_error *err = NULL;
2508 	struct got_tree_object *tree = NULL;
2509 	const char *p;
2510 	char *slash, *subpath = NULL;
2511 
2512 	/* Walk the path and open corresponding tree objects. */
2513 	p = path;
2514 	while (*p) {
2515 		struct got_tree_entry *te;
2516 		struct got_object_id *tree_id;
2517 		char *te_name;
2518 
2519 		while (p[0] == '/')
2520 			p++;
2521 
2522 		/* Ensure the correct subtree entry is selected. */
2523 		slash = strchr(p, '/');
2524 		if (slash == NULL)
2525 			te_name = strdup(p);
2526 		else
2527 			te_name = strndup(p, slash - p);
2528 		if (te_name == NULL) {
2529 			err = got_error_from_errno("strndup");
2530 			break;
2531 		}
2532 		te = got_object_tree_find_entry(s->tree, te_name);
2533 		if (te == NULL) {
2534 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2535 			free(te_name);
2536 			break;
2537 		}
2538 		free(te_name);
2539 		s->first_displayed_entry = s->selected_entry = te;
2540 
2541 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2542 			break; /* jump to this file's entry */
2543 
2544 		slash = strchr(p, '/');
2545 		if (slash)
2546 			subpath = strndup(path, slash - path);
2547 		else
2548 			subpath = strdup(path);
2549 		if (subpath == NULL) {
2550 			err = got_error_from_errno("strdup");
2551 			break;
2552 		}
2553 
2554 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2555 		    subpath);
2556 		if (err)
2557 			break;
2558 
2559 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2560 		free(tree_id);
2561 		if (err)
2562 			break;
2563 
2564 		err = tree_view_visit_subtree(s, tree);
2565 		if (err) {
2566 			got_object_tree_close(tree);
2567 			break;
2568 		}
2569 		if (slash == NULL)
2570 			break;
2571 		free(subpath);
2572 		subpath = NULL;
2573 		p = slash;
2574 	}
2575 
2576 	free(subpath);
2577 	return err;
2578 }
2579 
2580 static const struct got_error *
2581 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2582     struct commit_queue_entry *entry, const char *path,
2583     const char *head_ref_name, struct got_repository *repo)
2584 {
2585 	const struct got_error *err = NULL;
2586 	struct tog_tree_view_state *s;
2587 	struct tog_view *tree_view;
2588 
2589 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2590 	if (tree_view == NULL)
2591 		return got_error_from_errno("view_open");
2592 
2593 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2594 	if (err)
2595 		return err;
2596 	s = &tree_view->state.tree;
2597 
2598 	*new_view = tree_view;
2599 
2600 	if (got_path_is_root_dir(path))
2601 		return NULL;
2602 
2603 	return tree_view_walk_path(s, entry->commit, path);
2604 }
2605 
2606 static const struct got_error *
2607 block_signals_used_by_main_thread(void)
2608 {
2609 	sigset_t sigset;
2610 	int errcode;
2611 
2612 	if (sigemptyset(&sigset) == -1)
2613 		return got_error_from_errno("sigemptyset");
2614 
2615 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2616 	if (sigaddset(&sigset, SIGWINCH) == -1)
2617 		return got_error_from_errno("sigaddset");
2618 	if (sigaddset(&sigset, SIGCONT) == -1)
2619 		return got_error_from_errno("sigaddset");
2620 	if (sigaddset(&sigset, SIGINT) == -1)
2621 		return got_error_from_errno("sigaddset");
2622 	if (sigaddset(&sigset, SIGTERM) == -1)
2623 		return got_error_from_errno("sigaddset");
2624 
2625 	/* ncurses handles SIGTSTP */
2626 	if (sigaddset(&sigset, SIGTSTP) == -1)
2627 		return got_error_from_errno("sigaddset");
2628 
2629 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2630 	if (errcode)
2631 		return got_error_set_errno(errcode, "pthread_sigmask");
2632 
2633 	return NULL;
2634 }
2635 
2636 static void *
2637 log_thread(void *arg)
2638 {
2639 	const struct got_error *err = NULL;
2640 	int errcode = 0;
2641 	struct tog_log_thread_args *a = arg;
2642 	int done = 0;
2643 
2644 	/*
2645 	 * Sync startup with main thread such that we begin our
2646 	 * work once view_input() has released the mutex.
2647 	 */
2648 	errcode = pthread_mutex_lock(&tog_mutex);
2649 	if (errcode) {
2650 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2651 		return (void *)err;
2652 	}
2653 
2654 	err = block_signals_used_by_main_thread();
2655 	if (err) {
2656 		pthread_mutex_unlock(&tog_mutex);
2657 		goto done;
2658 	}
2659 
2660 	while (!done && !err && !tog_fatal_signal_received()) {
2661 		errcode = pthread_mutex_unlock(&tog_mutex);
2662 		if (errcode) {
2663 			err = got_error_set_errno(errcode,
2664 			    "pthread_mutex_unlock");
2665 			goto done;
2666 		}
2667 		err = queue_commits(a);
2668 		if (err) {
2669 			if (err->code != GOT_ERR_ITER_COMPLETED)
2670 				goto done;
2671 			err = NULL;
2672 			done = 1;
2673 		} else if (a->commits_needed > 0 && !a->load_all)
2674 			a->commits_needed--;
2675 
2676 		errcode = pthread_mutex_lock(&tog_mutex);
2677 		if (errcode) {
2678 			err = got_error_set_errno(errcode,
2679 			    "pthread_mutex_lock");
2680 			goto done;
2681 		} else if (*a->quit)
2682 			done = 1;
2683 		else if (*a->first_displayed_entry == NULL) {
2684 			*a->first_displayed_entry =
2685 			    TAILQ_FIRST(&a->commits->head);
2686 			*a->selected_entry = *a->first_displayed_entry;
2687 		}
2688 
2689 		errcode = pthread_cond_signal(&a->commit_loaded);
2690 		if (errcode) {
2691 			err = got_error_set_errno(errcode,
2692 			    "pthread_cond_signal");
2693 			pthread_mutex_unlock(&tog_mutex);
2694 			goto done;
2695 		}
2696 
2697 		if (done)
2698 			a->commits_needed = 0;
2699 		else {
2700 			if (a->commits_needed == 0 && !a->load_all) {
2701 				errcode = pthread_cond_wait(&a->need_commits,
2702 				    &tog_mutex);
2703 				if (errcode) {
2704 					err = got_error_set_errno(errcode,
2705 					    "pthread_cond_wait");
2706 					pthread_mutex_unlock(&tog_mutex);
2707 					goto done;
2708 				}
2709 				if (*a->quit)
2710 					done = 1;
2711 			}
2712 		}
2713 	}
2714 	a->log_complete = 1;
2715 	errcode = pthread_mutex_unlock(&tog_mutex);
2716 	if (errcode)
2717 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2718 done:
2719 	if (err) {
2720 		tog_thread_error = 1;
2721 		pthread_cond_signal(&a->commit_loaded);
2722 	}
2723 	return (void *)err;
2724 }
2725 
2726 static const struct got_error *
2727 stop_log_thread(struct tog_log_view_state *s)
2728 {
2729 	const struct got_error *err = NULL, *thread_err = NULL;
2730 	int errcode;
2731 
2732 	if (s->thread) {
2733 		s->quit = 1;
2734 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2735 		if (errcode)
2736 			return got_error_set_errno(errcode,
2737 			    "pthread_cond_signal");
2738 		errcode = pthread_mutex_unlock(&tog_mutex);
2739 		if (errcode)
2740 			return got_error_set_errno(errcode,
2741 			    "pthread_mutex_unlock");
2742 		errcode = pthread_join(s->thread, (void **)&thread_err);
2743 		if (errcode)
2744 			return got_error_set_errno(errcode, "pthread_join");
2745 		errcode = pthread_mutex_lock(&tog_mutex);
2746 		if (errcode)
2747 			return got_error_set_errno(errcode,
2748 			    "pthread_mutex_lock");
2749 		s->thread = 0; //NULL;
2750 	}
2751 
2752 	if (s->thread_args.repo) {
2753 		err = got_repo_close(s->thread_args.repo);
2754 		s->thread_args.repo = NULL;
2755 	}
2756 
2757 	if (s->thread_args.pack_fds) {
2758 		const struct got_error *pack_err =
2759 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2760 		if (err == NULL)
2761 			err = pack_err;
2762 		s->thread_args.pack_fds = NULL;
2763 	}
2764 
2765 	if (s->thread_args.graph) {
2766 		got_commit_graph_close(s->thread_args.graph);
2767 		s->thread_args.graph = NULL;
2768 	}
2769 
2770 	return err ? err : thread_err;
2771 }
2772 
2773 static const struct got_error *
2774 close_log_view(struct tog_view *view)
2775 {
2776 	const struct got_error *err = NULL;
2777 	struct tog_log_view_state *s = &view->state.log;
2778 	int errcode;
2779 
2780 	err = stop_log_thread(s);
2781 
2782 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2783 	if (errcode && err == NULL)
2784 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2785 
2786 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2787 	if (errcode && err == NULL)
2788 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2789 
2790 	free_commits(&s->commits);
2791 	free(s->in_repo_path);
2792 	s->in_repo_path = NULL;
2793 	free(s->start_id);
2794 	s->start_id = NULL;
2795 	free(s->head_ref_name);
2796 	s->head_ref_name = NULL;
2797 	return err;
2798 }
2799 
2800 static const struct got_error *
2801 search_start_log_view(struct tog_view *view)
2802 {
2803 	struct tog_log_view_state *s = &view->state.log;
2804 
2805 	s->matched_entry = NULL;
2806 	s->search_entry = NULL;
2807 	return NULL;
2808 }
2809 
2810 static const struct got_error *
2811 search_next_log_view(struct tog_view *view)
2812 {
2813 	const struct got_error *err = NULL;
2814 	struct tog_log_view_state *s = &view->state.log;
2815 	struct commit_queue_entry *entry;
2816 
2817 	/* Display progress update in log view. */
2818 	show_log_view(view);
2819 	update_panels();
2820 	doupdate();
2821 
2822 	if (s->search_entry) {
2823 		int errcode, ch;
2824 		errcode = pthread_mutex_unlock(&tog_mutex);
2825 		if (errcode)
2826 			return got_error_set_errno(errcode,
2827 			    "pthread_mutex_unlock");
2828 		ch = wgetch(view->window);
2829 		errcode = pthread_mutex_lock(&tog_mutex);
2830 		if (errcode)
2831 			return got_error_set_errno(errcode,
2832 			    "pthread_mutex_lock");
2833 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2834 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2835 			return NULL;
2836 		}
2837 		if (view->searching == TOG_SEARCH_FORWARD)
2838 			entry = TAILQ_NEXT(s->search_entry, entry);
2839 		else
2840 			entry = TAILQ_PREV(s->search_entry,
2841 			    commit_queue_head, entry);
2842 	} else if (s->matched_entry) {
2843 		int matched_idx = s->matched_entry->idx;
2844 		int selected_idx = s->selected_entry->idx;
2845 
2846 		/*
2847 		 * If the user has moved the cursor after we hit a match,
2848 		 * the position from where we should continue searching
2849 		 * might have changed.
2850 		 */
2851 		if (view->searching == TOG_SEARCH_FORWARD) {
2852 			if (matched_idx > selected_idx)
2853 				entry = TAILQ_NEXT(s->selected_entry, entry);
2854 			else
2855 				entry = TAILQ_NEXT(s->matched_entry, entry);
2856 		} else {
2857 			if (matched_idx < selected_idx)
2858 				entry = TAILQ_PREV(s->selected_entry,
2859 						commit_queue_head, entry);
2860 			else
2861 				entry = TAILQ_PREV(s->matched_entry,
2862 						commit_queue_head, entry);
2863 		}
2864 	} else {
2865 		entry = s->selected_entry;
2866 	}
2867 
2868 	while (1) {
2869 		int have_match = 0;
2870 
2871 		if (entry == NULL) {
2872 			if (s->thread_args.log_complete ||
2873 			    view->searching == TOG_SEARCH_BACKWARD) {
2874 				view->search_next_done =
2875 				    (s->matched_entry == NULL ?
2876 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2877 				s->search_entry = NULL;
2878 				return NULL;
2879 			}
2880 			/*
2881 			 * Poke the log thread for more commits and return,
2882 			 * allowing the main loop to make progress. Search
2883 			 * will resume at s->search_entry once we come back.
2884 			 */
2885 			s->thread_args.commits_needed++;
2886 			return trigger_log_thread(view, 0);
2887 		}
2888 
2889 		err = match_commit(&have_match, entry->id, entry->commit,
2890 		    &view->regex);
2891 		if (err)
2892 			break;
2893 		if (have_match) {
2894 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2895 			s->matched_entry = entry;
2896 			break;
2897 		}
2898 
2899 		s->search_entry = entry;
2900 		if (view->searching == TOG_SEARCH_FORWARD)
2901 			entry = TAILQ_NEXT(entry, entry);
2902 		else
2903 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2904 	}
2905 
2906 	if (s->matched_entry) {
2907 		int cur = s->selected_entry->idx;
2908 		while (cur < s->matched_entry->idx) {
2909 			err = input_log_view(NULL, view, KEY_DOWN);
2910 			if (err)
2911 				return err;
2912 			cur++;
2913 		}
2914 		while (cur > s->matched_entry->idx) {
2915 			err = input_log_view(NULL, view, KEY_UP);
2916 			if (err)
2917 				return err;
2918 			cur--;
2919 		}
2920 	}
2921 
2922 	s->search_entry = NULL;
2923 
2924 	return NULL;
2925 }
2926 
2927 static const struct got_error *
2928 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2929     struct got_repository *repo, const char *head_ref_name,
2930     const char *in_repo_path, int log_branches)
2931 {
2932 	const struct got_error *err = NULL;
2933 	struct tog_log_view_state *s = &view->state.log;
2934 	struct got_repository *thread_repo = NULL;
2935 	struct got_commit_graph *thread_graph = NULL;
2936 	int errcode;
2937 
2938 	if (in_repo_path != s->in_repo_path) {
2939 		free(s->in_repo_path);
2940 		s->in_repo_path = strdup(in_repo_path);
2941 		if (s->in_repo_path == NULL)
2942 			return got_error_from_errno("strdup");
2943 	}
2944 
2945 	/* The commit queue only contains commits being displayed. */
2946 	TAILQ_INIT(&s->commits.head);
2947 	s->commits.ncommits = 0;
2948 
2949 	s->repo = repo;
2950 	if (head_ref_name) {
2951 		s->head_ref_name = strdup(head_ref_name);
2952 		if (s->head_ref_name == NULL) {
2953 			err = got_error_from_errno("strdup");
2954 			goto done;
2955 		}
2956 	}
2957 	s->start_id = got_object_id_dup(start_id);
2958 	if (s->start_id == NULL) {
2959 		err = got_error_from_errno("got_object_id_dup");
2960 		goto done;
2961 	}
2962 	s->log_branches = log_branches;
2963 
2964 	STAILQ_INIT(&s->colors);
2965 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2966 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2967 		    get_color_value("TOG_COLOR_COMMIT"));
2968 		if (err)
2969 			goto done;
2970 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2971 		    get_color_value("TOG_COLOR_AUTHOR"));
2972 		if (err) {
2973 			free_colors(&s->colors);
2974 			goto done;
2975 		}
2976 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2977 		    get_color_value("TOG_COLOR_DATE"));
2978 		if (err) {
2979 			free_colors(&s->colors);
2980 			goto done;
2981 		}
2982 	}
2983 
2984 	view->show = show_log_view;
2985 	view->input = input_log_view;
2986 	view->close = close_log_view;
2987 	view->search_start = search_start_log_view;
2988 	view->search_next = search_next_log_view;
2989 
2990 	if (s->thread_args.pack_fds == NULL) {
2991 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2992 		if (err)
2993 			goto done;
2994 	}
2995 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
2996 	    s->thread_args.pack_fds);
2997 	if (err)
2998 		goto done;
2999 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3000 	    !s->log_branches);
3001 	if (err)
3002 		goto done;
3003 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3004 	    s->repo, NULL, NULL);
3005 	if (err)
3006 		goto done;
3007 
3008 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3009 	if (errcode) {
3010 		err = got_error_set_errno(errcode, "pthread_cond_init");
3011 		goto done;
3012 	}
3013 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3014 	if (errcode) {
3015 		err = got_error_set_errno(errcode, "pthread_cond_init");
3016 		goto done;
3017 	}
3018 
3019 	s->thread_args.commits_needed = view->nlines;
3020 	s->thread_args.graph = thread_graph;
3021 	s->thread_args.commits = &s->commits;
3022 	s->thread_args.in_repo_path = s->in_repo_path;
3023 	s->thread_args.start_id = s->start_id;
3024 	s->thread_args.repo = thread_repo;
3025 	s->thread_args.log_complete = 0;
3026 	s->thread_args.quit = &s->quit;
3027 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3028 	s->thread_args.selected_entry = &s->selected_entry;
3029 	s->thread_args.searching = &view->searching;
3030 	s->thread_args.search_next_done = &view->search_next_done;
3031 	s->thread_args.regex = &view->regex;
3032 done:
3033 	if (err)
3034 		close_log_view(view);
3035 	return err;
3036 }
3037 
3038 static const struct got_error *
3039 show_log_view(struct tog_view *view)
3040 {
3041 	const struct got_error *err;
3042 	struct tog_log_view_state *s = &view->state.log;
3043 
3044 	if (s->thread == 0) { //NULL) {
3045 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3046 		    &s->thread_args);
3047 		if (errcode)
3048 			return got_error_set_errno(errcode, "pthread_create");
3049 		if (s->thread_args.commits_needed > 0) {
3050 			err = trigger_log_thread(view, 1);
3051 			if (err)
3052 				return err;
3053 		}
3054 	}
3055 
3056 	return draw_commits(view);
3057 }
3058 
3059 static void
3060 log_move_cursor_up(struct tog_view *view, int page, int home)
3061 {
3062 	struct tog_log_view_state *s = &view->state.log;
3063 
3064 	if (s->selected_entry->idx == 0)
3065 		view->count = 0;
3066 	if (s->first_displayed_entry == NULL)
3067 		return;
3068 
3069 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3070 	    || home)
3071 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3072 
3073 	if (!page && !home && s->selected > 0)
3074 		--s->selected;
3075 	else
3076 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3077 
3078 	select_commit(s);
3079 	return;
3080 }
3081 
3082 static const struct got_error *
3083 log_move_cursor_down(struct tog_view *view, int page)
3084 {
3085 	struct tog_log_view_state	*s = &view->state.log;
3086 	struct commit_queue_entry	*first;
3087 	const struct got_error		*err = NULL;
3088 
3089 	first = s->first_displayed_entry;
3090 	if (first == NULL) {
3091 		view->count = 0;
3092 		return NULL;
3093 	}
3094 
3095 	if (s->thread_args.log_complete &&
3096 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3097 		return NULL;
3098 
3099 	if (!page) {
3100 		int eos = view->nlines - 2;
3101 
3102 		if (view_is_hsplit_top(view))
3103 			--eos;  /* border consumes the last line */
3104 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3105 			++s->selected;
3106 		else
3107 			err = log_scroll_down(view, 1);
3108 	} else if (s->thread_args.load_all) {
3109 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3110 			s->selected += MIN(s->last_displayed_entry->idx -
3111 			    s->selected_entry->idx, page + 1);
3112 		else
3113 			err = log_scroll_down(view, MIN(page,
3114 			    s->commits.ncommits - s->selected_entry->idx - 1));
3115 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3116 	} else {
3117 		err = log_scroll_down(view, page);
3118 		if (err)
3119 			return err;
3120 		if (first == s->first_displayed_entry && s->selected <
3121 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3122 			s->selected = MIN(s->commits.ncommits - 1, page);
3123 		}
3124 	}
3125 	if (err)
3126 		return err;
3127 
3128 	/*
3129 	 * We might necessarily overshoot in horizontal
3130 	 * splits; if so, select the last displayed commit.
3131 	 */
3132 	s->selected = MIN(s->selected,
3133 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3134 
3135 	select_commit(s);
3136 
3137 	if (s->thread_args.log_complete &&
3138 	    s->selected_entry->idx == s->commits.ncommits - 1)
3139 		view->count = 0;
3140 
3141 	return NULL;
3142 }
3143 
3144 static void
3145 view_get_split(struct tog_view *view, int *y, int *x)
3146 {
3147 	*x = 0;
3148 	*y = 0;
3149 
3150 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3151 		if (view->child && view->child->resized_y)
3152 			*y = view->child->resized_y;
3153 		else if (view->resized_y)
3154 			*y = view->resized_y;
3155 		else
3156 			*y = view_split_begin_y(view->lines);
3157 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3158 		if (view->child && view->child->resized_x)
3159 			*x = view->child->resized_x;
3160 		else if (view->resized_x)
3161 			*x = view->resized_x;
3162 		else
3163 			*x = view_split_begin_x(view->begin_x);
3164 	}
3165 }
3166 
3167 /* Split view horizontally at y and offset view->state->selected line. */
3168 static const struct got_error *
3169 view_init_hsplit(struct tog_view *view, int y)
3170 {
3171 	const struct got_error *err = NULL;
3172 
3173 	view->nlines = y;
3174 	view->ncols = COLS;
3175 	err = view_resize(view);
3176 	if (err)
3177 		return err;
3178 
3179 	err = offset_selection_down(view);
3180 
3181 	return err;
3182 }
3183 
3184 static const struct got_error *
3185 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3186 {
3187 	const struct got_error *err = NULL;
3188 	struct tog_log_view_state *s = &view->state.log;
3189 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3190 	struct tog_view *ref_view = NULL;
3191 	struct commit_queue_entry *entry;
3192 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3193 
3194 	if (s->thread_args.load_all) {
3195 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3196 			s->thread_args.load_all = 0;
3197 		else if (s->thread_args.log_complete) {
3198 			err = log_move_cursor_down(view, s->commits.ncommits);
3199 			s->thread_args.load_all = 0;
3200 		}
3201 		return err;
3202 	}
3203 
3204 	eos = nscroll = view->nlines - 1;
3205 	if (view_is_hsplit_top(view))
3206 		--eos;  /* border */
3207 
3208 	switch (ch) {
3209 	case 'q':
3210 		s->quit = 1;
3211 		break;
3212 	case '0':
3213 		view->x = 0;
3214 		break;
3215 	case '$':
3216 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3217 		view->count = 0;
3218 		break;
3219 	case KEY_RIGHT:
3220 	case 'l':
3221 		if (view->x + view->ncols / 2 < view->maxx)
3222 			view->x += 2;  /* move two columns right */
3223 		else
3224 			view->count = 0;
3225 		break;
3226 	case KEY_LEFT:
3227 	case 'h':
3228 		view->x -= MIN(view->x, 2);  /* move two columns back */
3229 		if (view->x <= 0)
3230 			view->count = 0;
3231 		break;
3232 	case 'k':
3233 	case KEY_UP:
3234 	case '<':
3235 	case ',':
3236 	case CTRL('p'):
3237 		log_move_cursor_up(view, 0, 0);
3238 		break;
3239 	case 'g':
3240 	case KEY_HOME:
3241 		log_move_cursor_up(view, 0, 1);
3242 		view->count = 0;
3243 		break;
3244 	case CTRL('u'):
3245 	case 'u':
3246 		nscroll /= 2;
3247 		/* FALL THROUGH */
3248 	case KEY_PPAGE:
3249 	case CTRL('b'):
3250 	case 'b':
3251 		log_move_cursor_up(view, nscroll, 0);
3252 		break;
3253 	case 'j':
3254 	case KEY_DOWN:
3255 	case '>':
3256 	case '.':
3257 	case CTRL('n'):
3258 		err = log_move_cursor_down(view, 0);
3259 		break;
3260 	case 'G':
3261 	case KEY_END: {
3262 		/* We don't know yet how many commits, so we're forced to
3263 		 * traverse them all. */
3264 		view->count = 0;
3265 		if (!s->thread_args.log_complete) {
3266 			s->thread_args.load_all = 1;
3267 			return trigger_log_thread(view, 0);
3268 		}
3269 
3270 		s->selected = 0;
3271 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3272 		for (n = 0; n < eos; n++) {
3273 			if (entry == NULL)
3274 				break;
3275 			s->first_displayed_entry = entry;
3276 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3277 		}
3278 		if (n > 0)
3279 			s->selected = n - 1;
3280 		select_commit(s);
3281 		break;
3282 	}
3283 	case CTRL('d'):
3284 	case 'd':
3285 		nscroll /= 2;
3286 		/* FALL THROUGH */
3287 	case KEY_NPAGE:
3288 	case CTRL('f'):
3289 	case 'f':
3290 	case ' ':
3291 		err = log_move_cursor_down(view, nscroll);
3292 		break;
3293 	case KEY_RESIZE:
3294 		if (s->selected > view->nlines - 2)
3295 			s->selected = view->nlines - 2;
3296 		if (s->selected > s->commits.ncommits - 1)
3297 			s->selected = s->commits.ncommits - 1;
3298 		select_commit(s);
3299 		if (s->commits.ncommits < view->nlines - 1 &&
3300 		    !s->thread_args.log_complete) {
3301 			s->thread_args.commits_needed += (view->nlines - 1) -
3302 			    s->commits.ncommits;
3303 			err = trigger_log_thread(view, 1);
3304 		}
3305 		break;
3306 	case KEY_ENTER:
3307 	case '\r':
3308 		view->count = 0;
3309 		if (s->selected_entry == NULL)
3310 			break;
3311 
3312 		/* get dimensions--don't split till initialisation succeeds */
3313 		if (view_is_parent_view(view))
3314 			view_get_split(view, &begin_y, &begin_x);
3315 
3316 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3317 		    s->selected_entry->commit, s->selected_entry->id,
3318 		    view, s->repo);
3319 		if (err)
3320 			break;
3321 
3322 		if (view_is_parent_view(view) &&
3323 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3324 			err = view_init_hsplit(view, begin_y);
3325 			if (err)
3326 				break;
3327 		}
3328 
3329 		view->focussed = 0;
3330 		diff_view->focussed = 1;
3331 		diff_view->mode = view->mode;
3332 		diff_view->nlines = view->lines - begin_y;
3333 
3334 		if (view_is_parent_view(view)) {
3335 			view_transfer_size(diff_view, view);
3336 			err = view_close_child(view);
3337 			if (err)
3338 				return err;
3339 			err = view_set_child(view, diff_view);
3340 			if (err)
3341 				return err;
3342 			view->focus_child = 1;
3343 		} else
3344 			*new_view = diff_view;
3345 		break;
3346 	case 't':
3347 		view->count = 0;
3348 		if (s->selected_entry == NULL)
3349 			break;
3350 		if (view_is_parent_view(view))
3351 			view_get_split(view, &begin_y, &begin_x);
3352 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3353 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3354 		    s->repo);
3355 		if (err)
3356 			break;
3357 		if (view_is_parent_view(view) &&
3358 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3359 			err = view_init_hsplit(view, begin_y);
3360 			if (err)
3361 				break;
3362 		}
3363 		view->focussed = 0;
3364 		tree_view->focussed = 1;
3365 		tree_view->mode = view->mode;
3366 		tree_view->nlines = view->lines - begin_y;
3367 		if (view_is_parent_view(view)) {
3368 			view_transfer_size(tree_view, view);
3369 			err = view_close_child(view);
3370 			if (err)
3371 				return err;
3372 			err = view_set_child(view, tree_view);
3373 			if (err)
3374 				return err;
3375 			view->focus_child = 1;
3376 		} else
3377 			*new_view = tree_view;
3378 		break;
3379 	case KEY_BACKSPACE:
3380 	case CTRL('l'):
3381 	case 'B':
3382 		view->count = 0;
3383 		if (ch == KEY_BACKSPACE &&
3384 		    got_path_is_root_dir(s->in_repo_path))
3385 			break;
3386 		err = stop_log_thread(s);
3387 		if (err)
3388 			return err;
3389 		if (ch == KEY_BACKSPACE) {
3390 			char *parent_path;
3391 			err = got_path_dirname(&parent_path, s->in_repo_path);
3392 			if (err)
3393 				return err;
3394 			free(s->in_repo_path);
3395 			s->in_repo_path = parent_path;
3396 			s->thread_args.in_repo_path = s->in_repo_path;
3397 		} else if (ch == CTRL('l')) {
3398 			struct got_object_id *start_id;
3399 			err = got_repo_match_object_id(&start_id, NULL,
3400 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3401 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3402 			if (err)
3403 				return err;
3404 			free(s->start_id);
3405 			s->start_id = start_id;
3406 			s->thread_args.start_id = s->start_id;
3407 		} else /* 'B' */
3408 			s->log_branches = !s->log_branches;
3409 
3410 		if (s->thread_args.pack_fds == NULL) {
3411 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3412 			if (err)
3413 				return err;
3414 		}
3415 		err = got_repo_open(&s->thread_args.repo,
3416 		    got_repo_get_path(s->repo), NULL,
3417 		    s->thread_args.pack_fds);
3418 		if (err)
3419 			return err;
3420 		tog_free_refs();
3421 		err = tog_load_refs(s->repo, 0);
3422 		if (err)
3423 			return err;
3424 		err = got_commit_graph_open(&s->thread_args.graph,
3425 		    s->in_repo_path, !s->log_branches);
3426 		if (err)
3427 			return err;
3428 		err = got_commit_graph_iter_start(s->thread_args.graph,
3429 		    s->start_id, s->repo, NULL, NULL);
3430 		if (err)
3431 			return err;
3432 		free_commits(&s->commits);
3433 		s->first_displayed_entry = NULL;
3434 		s->last_displayed_entry = NULL;
3435 		s->selected_entry = NULL;
3436 		s->selected = 0;
3437 		s->thread_args.log_complete = 0;
3438 		s->quit = 0;
3439 		s->thread_args.commits_needed = view->lines;
3440 		s->matched_entry = NULL;
3441 		s->search_entry = NULL;
3442 		break;
3443 	case 'r':
3444 		view->count = 0;
3445 		if (view_is_parent_view(view))
3446 			view_get_split(view, &begin_y, &begin_x);
3447 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3448 		if (ref_view == NULL)
3449 			return got_error_from_errno("view_open");
3450 		err = open_ref_view(ref_view, s->repo);
3451 		if (err) {
3452 			view_close(ref_view);
3453 			return err;
3454 		}
3455 		if (view_is_parent_view(view) &&
3456 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3457 			err = view_init_hsplit(view, begin_y);
3458 			if (err)
3459 				break;
3460 		}
3461 		view->focussed = 0;
3462 		ref_view->focussed = 1;
3463 		ref_view->mode = view->mode;
3464 		ref_view->nlines = view->lines - begin_y;
3465 		if (view_is_parent_view(view)) {
3466 			view_transfer_size(ref_view, view);
3467 			err = view_close_child(view);
3468 			if (err)
3469 				return err;
3470 			err = view_set_child(view, ref_view);
3471 			if (err)
3472 				return err;
3473 			view->focus_child = 1;
3474 		} else
3475 			*new_view = ref_view;
3476 		break;
3477 	default:
3478 		view->count = 0;
3479 		break;
3480 	}
3481 
3482 	return err;
3483 }
3484 
3485 static const struct got_error *
3486 apply_unveil(const char *repo_path, const char *worktree_path)
3487 {
3488 	const struct got_error *error;
3489 
3490 #ifdef PROFILE
3491 	if (unveil("gmon.out", "rwc") != 0)
3492 		return got_error_from_errno2("unveil", "gmon.out");
3493 #endif
3494 	if (repo_path && unveil(repo_path, "r") != 0)
3495 		return got_error_from_errno2("unveil", repo_path);
3496 
3497 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3498 		return got_error_from_errno2("unveil", worktree_path);
3499 
3500 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3501 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3502 
3503 	error = got_privsep_unveil_exec_helpers();
3504 	if (error != NULL)
3505 		return error;
3506 
3507 	if (unveil(NULL, NULL) != 0)
3508 		return got_error_from_errno("unveil");
3509 
3510 	return NULL;
3511 }
3512 
3513 static void
3514 init_curses(void)
3515 {
3516 	/*
3517 	 * Override default signal handlers before starting ncurses.
3518 	 * This should prevent ncurses from installing its own
3519 	 * broken cleanup() signal handler.
3520 	 */
3521 	signal(SIGWINCH, tog_sigwinch);
3522 	signal(SIGPIPE, tog_sigpipe);
3523 	signal(SIGCONT, tog_sigcont);
3524 	signal(SIGINT, tog_sigint);
3525 	signal(SIGTERM, tog_sigterm);
3526 
3527 	initscr();
3528 	cbreak();
3529 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3530 	noecho();
3531 	nonl();
3532 	intrflush(stdscr, FALSE);
3533 	keypad(stdscr, TRUE);
3534 	curs_set(0);
3535 	if (getenv("TOG_COLORS") != NULL) {
3536 		start_color();
3537 		use_default_colors();
3538 	}
3539 }
3540 
3541 static const struct got_error *
3542 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3543     struct got_repository *repo, struct got_worktree *worktree)
3544 {
3545 	const struct got_error *err = NULL;
3546 
3547 	if (argc == 0) {
3548 		*in_repo_path = strdup("/");
3549 		if (*in_repo_path == NULL)
3550 			return got_error_from_errno("strdup");
3551 		return NULL;
3552 	}
3553 
3554 	if (worktree) {
3555 		const char *prefix = got_worktree_get_path_prefix(worktree);
3556 		char *p;
3557 
3558 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3559 		if (err)
3560 			return err;
3561 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3562 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3563 		    p) == -1) {
3564 			err = got_error_from_errno("asprintf");
3565 			*in_repo_path = NULL;
3566 		}
3567 		free(p);
3568 	} else
3569 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3570 
3571 	return err;
3572 }
3573 
3574 static const struct got_error *
3575 cmd_log(int argc, char *argv[])
3576 {
3577 	const struct got_error *error;
3578 	struct got_repository *repo = NULL;
3579 	struct got_worktree *worktree = NULL;
3580 	struct got_object_id *start_id = NULL;
3581 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3582 	char *start_commit = NULL, *label = NULL;
3583 	struct got_reference *ref = NULL;
3584 	const char *head_ref_name = NULL;
3585 	int ch, log_branches = 0;
3586 	struct tog_view *view;
3587 	int *pack_fds = NULL;
3588 
3589 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3590 		switch (ch) {
3591 		case 'b':
3592 			log_branches = 1;
3593 			break;
3594 		case 'c':
3595 			start_commit = optarg;
3596 			break;
3597 		case 'r':
3598 			repo_path = realpath(optarg, NULL);
3599 			if (repo_path == NULL)
3600 				return got_error_from_errno2("realpath",
3601 				    optarg);
3602 			break;
3603 		default:
3604 			usage_log();
3605 			/* NOTREACHED */
3606 		}
3607 	}
3608 
3609 	argc -= optind;
3610 	argv += optind;
3611 
3612 	if (argc > 1)
3613 		usage_log();
3614 
3615 	error = got_repo_pack_fds_open(&pack_fds);
3616 	if (error != NULL)
3617 		goto done;
3618 
3619 	if (repo_path == NULL) {
3620 		cwd = getcwd(NULL, 0);
3621 		if (cwd == NULL)
3622 			return got_error_from_errno("getcwd");
3623 		error = got_worktree_open(&worktree, cwd);
3624 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3625 			goto done;
3626 		if (worktree)
3627 			repo_path =
3628 			    strdup(got_worktree_get_repo_path(worktree));
3629 		else
3630 			repo_path = strdup(cwd);
3631 		if (repo_path == NULL) {
3632 			error = got_error_from_errno("strdup");
3633 			goto done;
3634 		}
3635 	}
3636 
3637 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3638 	if (error != NULL)
3639 		goto done;
3640 
3641 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3642 	    repo, worktree);
3643 	if (error)
3644 		goto done;
3645 
3646 	init_curses();
3647 
3648 	error = apply_unveil(got_repo_get_path(repo),
3649 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3650 	if (error)
3651 		goto done;
3652 
3653 	/* already loaded by tog_log_with_path()? */
3654 	if (TAILQ_EMPTY(&tog_refs)) {
3655 		error = tog_load_refs(repo, 0);
3656 		if (error)
3657 			goto done;
3658 	}
3659 
3660 	if (start_commit == NULL) {
3661 		error = got_repo_match_object_id(&start_id, &label,
3662 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3663 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3664 		if (error)
3665 			goto done;
3666 		head_ref_name = label;
3667 	} else {
3668 		error = got_ref_open(&ref, repo, start_commit, 0);
3669 		if (error == NULL)
3670 			head_ref_name = got_ref_get_name(ref);
3671 		else if (error->code != GOT_ERR_NOT_REF)
3672 			goto done;
3673 		error = got_repo_match_object_id(&start_id, NULL,
3674 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3675 		if (error)
3676 			goto done;
3677 	}
3678 
3679 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3680 	if (view == NULL) {
3681 		error = got_error_from_errno("view_open");
3682 		goto done;
3683 	}
3684 	error = open_log_view(view, start_id, repo, head_ref_name,
3685 	    in_repo_path, log_branches);
3686 	if (error)
3687 		goto done;
3688 	if (worktree) {
3689 		/* Release work tree lock. */
3690 		got_worktree_close(worktree);
3691 		worktree = NULL;
3692 	}
3693 	error = view_loop(view);
3694 done:
3695 	free(in_repo_path);
3696 	free(repo_path);
3697 	free(cwd);
3698 	free(start_id);
3699 	free(label);
3700 	if (ref)
3701 		got_ref_close(ref);
3702 	if (repo) {
3703 		const struct got_error *close_err = got_repo_close(repo);
3704 		if (error == NULL)
3705 			error = close_err;
3706 	}
3707 	if (worktree)
3708 		got_worktree_close(worktree);
3709 	if (pack_fds) {
3710 		const struct got_error *pack_err =
3711 		    got_repo_pack_fds_close(pack_fds);
3712 		if (error == NULL)
3713 			error = pack_err;
3714 	}
3715 	tog_free_refs();
3716 	return error;
3717 }
3718 
3719 __dead static void
3720 usage_diff(void)
3721 {
3722 	endwin();
3723 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3724 	    "[-w] object1 object2\n", getprogname());
3725 	exit(1);
3726 }
3727 
3728 static int
3729 match_line(const char *line, regex_t *regex, size_t nmatch,
3730     regmatch_t *regmatch)
3731 {
3732 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3733 }
3734 
3735 static struct tog_color *
3736 match_color(struct tog_colors *colors, const char *line)
3737 {
3738 	struct tog_color *tc = NULL;
3739 
3740 	STAILQ_FOREACH(tc, colors, entry) {
3741 		if (match_line(line, &tc->regex, 0, NULL))
3742 			return tc;
3743 	}
3744 
3745 	return NULL;
3746 }
3747 
3748 static const struct got_error *
3749 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3750     WINDOW *window, int skipcol, regmatch_t *regmatch)
3751 {
3752 	const struct got_error *err = NULL;
3753 	char *exstr = NULL;
3754 	wchar_t *wline = NULL;
3755 	int rme, rms, n, width, scrollx;
3756 	int width0 = 0, width1 = 0, width2 = 0;
3757 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3758 
3759 	*wtotal = 0;
3760 
3761 	rms = regmatch->rm_so;
3762 	rme = regmatch->rm_eo;
3763 
3764 	err = expand_tab(&exstr, line);
3765 	if (err)
3766 		return err;
3767 
3768 	/* Split the line into 3 segments, according to match offsets. */
3769 	seg0 = strndup(exstr, rms);
3770 	if (seg0 == NULL) {
3771 		err = got_error_from_errno("strndup");
3772 		goto done;
3773 	}
3774 	seg1 = strndup(exstr + rms, rme - rms);
3775 	if (seg1 == NULL) {
3776 		err = got_error_from_errno("strndup");
3777 		goto done;
3778 	}
3779 	seg2 = strdup(exstr + rme);
3780 	if (seg2 == NULL) {
3781 		err = got_error_from_errno("strndup");
3782 		goto done;
3783 	}
3784 
3785 	/* draw up to matched token if we haven't scrolled past it */
3786 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3787 	    col_tab_align, 1);
3788 	if (err)
3789 		goto done;
3790 	n = MAX(width0 - skipcol, 0);
3791 	if (n) {
3792 		free(wline);
3793 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3794 		    wlimit, col_tab_align, 1);
3795 		if (err)
3796 			goto done;
3797 		waddwstr(window, &wline[scrollx]);
3798 		wlimit -= width;
3799 		*wtotal += width;
3800 	}
3801 
3802 	if (wlimit > 0) {
3803 		int i = 0, w = 0;
3804 		size_t wlen;
3805 
3806 		free(wline);
3807 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3808 		    col_tab_align, 1);
3809 		if (err)
3810 			goto done;
3811 		wlen = wcslen(wline);
3812 		while (i < wlen) {
3813 			width = wcwidth(wline[i]);
3814 			if (width == -1) {
3815 				/* should not happen, tabs are expanded */
3816 				err = got_error(GOT_ERR_RANGE);
3817 				goto done;
3818 			}
3819 			if (width0 + w + width > skipcol)
3820 				break;
3821 			w += width;
3822 			i++;
3823 		}
3824 		/* draw (visible part of) matched token (if scrolled into it) */
3825 		if (width1 - w > 0) {
3826 			wattron(window, A_STANDOUT);
3827 			waddwstr(window, &wline[i]);
3828 			wattroff(window, A_STANDOUT);
3829 			wlimit -= (width1 - w);
3830 			*wtotal += (width1 - w);
3831 		}
3832 	}
3833 
3834 	if (wlimit > 0) {  /* draw rest of line */
3835 		free(wline);
3836 		if (skipcol > width0 + width1) {
3837 			err = format_line(&wline, &width2, &scrollx, seg2,
3838 			    skipcol - (width0 + width1), wlimit,
3839 			    col_tab_align, 1);
3840 			if (err)
3841 				goto done;
3842 			waddwstr(window, &wline[scrollx]);
3843 		} else {
3844 			err = format_line(&wline, &width2, NULL, seg2, 0,
3845 			    wlimit, col_tab_align, 1);
3846 			if (err)
3847 				goto done;
3848 			waddwstr(window, wline);
3849 		}
3850 		*wtotal += width2;
3851 	}
3852 done:
3853 	free(wline);
3854 	free(exstr);
3855 	free(seg0);
3856 	free(seg1);
3857 	free(seg2);
3858 	return err;
3859 }
3860 
3861 static const struct got_error *
3862 draw_file(struct tog_view *view, const char *header)
3863 {
3864 	struct tog_diff_view_state *s = &view->state.diff;
3865 	regmatch_t *regmatch = &view->regmatch;
3866 	const struct got_error *err;
3867 	int nprinted = 0;
3868 	char *line;
3869 	size_t linesize = 0;
3870 	ssize_t linelen;
3871 	struct tog_color *tc;
3872 	wchar_t *wline;
3873 	int width;
3874 	int max_lines = view->nlines;
3875 	int nlines = s->nlines;
3876 	off_t line_offset;
3877 
3878 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3879 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3880 		return got_error_from_errno("fseek");
3881 
3882 	werase(view->window);
3883 
3884 	if (header) {
3885 		if (asprintf(&line, "[%d/%d] %s",
3886 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3887 		    header) == -1)
3888 			return got_error_from_errno("asprintf");
3889 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3890 		    0, 0);
3891 		free(line);
3892 		if (err)
3893 			return err;
3894 
3895 		if (view_needs_focus_indication(view))
3896 			wstandout(view->window);
3897 		waddwstr(view->window, wline);
3898 		free(wline);
3899 		wline = NULL;
3900 		if (view_needs_focus_indication(view))
3901 			wstandend(view->window);
3902 		if (width <= view->ncols - 1)
3903 			waddch(view->window, '\n');
3904 
3905 		if (max_lines <= 1)
3906 			return NULL;
3907 		max_lines--;
3908 	}
3909 
3910 	s->eof = 0;
3911 	view->maxx = 0;
3912 	line = NULL;
3913 	while (max_lines > 0 && nprinted < max_lines) {
3914 		linelen = getline(&line, &linesize, s->f);
3915 		if (linelen == -1) {
3916 			if (feof(s->f)) {
3917 				s->eof = 1;
3918 				break;
3919 			}
3920 			free(line);
3921 			return got_ferror(s->f, GOT_ERR_IO);
3922 		}
3923 
3924 		/* Set view->maxx based on full line length. */
3925 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3926 		    view->x ? 1 : 0);
3927 		if (err) {
3928 			free(line);
3929 			return err;
3930 		}
3931 		view->maxx = MAX(view->maxx, width);
3932 		free(wline);
3933 		wline = NULL;
3934 
3935 		tc = match_color(&s->colors, line);
3936 		if (tc)
3937 			wattr_on(view->window,
3938 			    COLOR_PAIR(tc->colorpair), NULL);
3939 		if (s->first_displayed_line + nprinted == s->matched_line &&
3940 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3941 			err = add_matched_line(&width, line, view->ncols, 0,
3942 			    view->window, view->x, regmatch);
3943 			if (err) {
3944 				free(line);
3945 				return err;
3946 			}
3947 		} else {
3948 			int skip;
3949 			err = format_line(&wline, &width, &skip, line,
3950 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3951 			if (err) {
3952 				free(line);
3953 				return err;
3954 			}
3955 			waddwstr(view->window, &wline[skip]);
3956 			free(wline);
3957 			wline = NULL;
3958 		}
3959 		if (tc)
3960 			wattr_off(view->window,
3961 			    COLOR_PAIR(tc->colorpair), NULL);
3962 		if (width <= view->ncols - 1)
3963 			waddch(view->window, '\n');
3964 		nprinted++;
3965 	}
3966 	free(line);
3967 	if (nprinted >= 1)
3968 		s->last_displayed_line = s->first_displayed_line +
3969 		    (nprinted - 1);
3970 	else
3971 		s->last_displayed_line = s->first_displayed_line;
3972 
3973 	view_border(view);
3974 
3975 	if (s->eof) {
3976 		while (nprinted < view->nlines) {
3977 			waddch(view->window, '\n');
3978 			nprinted++;
3979 		}
3980 
3981 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3982 		    view->ncols, 0, 0);
3983 		if (err) {
3984 			return err;
3985 		}
3986 
3987 		wstandout(view->window);
3988 		waddwstr(view->window, wline);
3989 		free(wline);
3990 		wline = NULL;
3991 		wstandend(view->window);
3992 	}
3993 
3994 	return NULL;
3995 }
3996 
3997 static char *
3998 get_datestr(time_t *time, char *datebuf)
3999 {
4000 	struct tm mytm, *tm;
4001 	char *p, *s;
4002 
4003 	tm = gmtime_r(time, &mytm);
4004 	if (tm == NULL)
4005 		return NULL;
4006 	s = asctime_r(tm, datebuf);
4007 	if (s == NULL)
4008 		return NULL;
4009 	p = strchr(s, '\n');
4010 	if (p)
4011 		*p = '\0';
4012 	return s;
4013 }
4014 
4015 static const struct got_error *
4016 get_changed_paths(struct got_pathlist_head *paths,
4017     struct got_commit_object *commit, struct got_repository *repo)
4018 {
4019 	const struct got_error *err = NULL;
4020 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4021 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4022 	struct got_object_qid *qid;
4023 
4024 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4025 	if (qid != NULL) {
4026 		struct got_commit_object *pcommit;
4027 		err = got_object_open_as_commit(&pcommit, repo,
4028 		    &qid->id);
4029 		if (err)
4030 			return err;
4031 
4032 		tree_id1 = got_object_id_dup(
4033 		    got_object_commit_get_tree_id(pcommit));
4034 		if (tree_id1 == NULL) {
4035 			got_object_commit_close(pcommit);
4036 			return got_error_from_errno("got_object_id_dup");
4037 		}
4038 		got_object_commit_close(pcommit);
4039 
4040 	}
4041 
4042 	if (tree_id1) {
4043 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4044 		if (err)
4045 			goto done;
4046 	}
4047 
4048 	tree_id2 = got_object_commit_get_tree_id(commit);
4049 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4050 	if (err)
4051 		goto done;
4052 
4053 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4054 	    got_diff_tree_collect_changed_paths, paths, 0);
4055 done:
4056 	if (tree1)
4057 		got_object_tree_close(tree1);
4058 	if (tree2)
4059 		got_object_tree_close(tree2);
4060 	free(tree_id1);
4061 	return err;
4062 }
4063 
4064 static const struct got_error *
4065 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4066 {
4067 	off_t *p;
4068 
4069 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4070 	if (p == NULL)
4071 		return got_error_from_errno("reallocarray");
4072 	*line_offsets = p;
4073 	(*line_offsets)[*nlines] = off;
4074 	(*nlines)++;
4075 	return NULL;
4076 }
4077 
4078 static const struct got_error *
4079 write_commit_info(off_t **line_offsets, size_t *nlines,
4080     struct got_object_id *commit_id, struct got_reflist_head *refs,
4081     struct got_repository *repo, FILE *outfile)
4082 {
4083 	const struct got_error *err = NULL;
4084 	char datebuf[26], *datestr;
4085 	struct got_commit_object *commit;
4086 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4087 	time_t committer_time;
4088 	const char *author, *committer;
4089 	char *refs_str = NULL;
4090 	struct got_pathlist_head changed_paths;
4091 	struct got_pathlist_entry *pe;
4092 	off_t outoff = 0;
4093 	int n;
4094 
4095 	TAILQ_INIT(&changed_paths);
4096 
4097 	if (refs) {
4098 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4099 		if (err)
4100 			return err;
4101 	}
4102 
4103 	err = got_object_open_as_commit(&commit, repo, commit_id);
4104 	if (err)
4105 		return err;
4106 
4107 	err = got_object_id_str(&id_str, commit_id);
4108 	if (err) {
4109 		err = got_error_from_errno("got_object_id_str");
4110 		goto done;
4111 	}
4112 
4113 	err = add_line_offset(line_offsets, nlines, 0);
4114 	if (err)
4115 		goto done;
4116 
4117 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4118 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4119 	if (n < 0) {
4120 		err = got_error_from_errno("fprintf");
4121 		goto done;
4122 	}
4123 	outoff += n;
4124 	err = add_line_offset(line_offsets, nlines, outoff);
4125 	if (err)
4126 		goto done;
4127 
4128 	n = fprintf(outfile, "from: %s\n",
4129 	    got_object_commit_get_author(commit));
4130 	if (n < 0) {
4131 		err = got_error_from_errno("fprintf");
4132 		goto done;
4133 	}
4134 	outoff += n;
4135 	err = add_line_offset(line_offsets, nlines, outoff);
4136 	if (err)
4137 		goto done;
4138 
4139 	committer_time = got_object_commit_get_committer_time(commit);
4140 	datestr = get_datestr(&committer_time, datebuf);
4141 	if (datestr) {
4142 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4143 		if (n < 0) {
4144 			err = got_error_from_errno("fprintf");
4145 			goto done;
4146 		}
4147 		outoff += n;
4148 		err = add_line_offset(line_offsets, nlines, outoff);
4149 		if (err)
4150 			goto done;
4151 	}
4152 	author = got_object_commit_get_author(commit);
4153 	committer = got_object_commit_get_committer(commit);
4154 	if (strcmp(author, committer) != 0) {
4155 		n = fprintf(outfile, "via: %s\n", committer);
4156 		if (n < 0) {
4157 			err = got_error_from_errno("fprintf");
4158 			goto done;
4159 		}
4160 		outoff += n;
4161 		err = add_line_offset(line_offsets, nlines, outoff);
4162 		if (err)
4163 			goto done;
4164 	}
4165 	if (got_object_commit_get_nparents(commit) > 1) {
4166 		const struct got_object_id_queue *parent_ids;
4167 		struct got_object_qid *qid;
4168 		int pn = 1;
4169 		parent_ids = got_object_commit_get_parent_ids(commit);
4170 		STAILQ_FOREACH(qid, parent_ids, entry) {
4171 			err = got_object_id_str(&id_str, &qid->id);
4172 			if (err)
4173 				goto done;
4174 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4175 			if (n < 0) {
4176 				err = got_error_from_errno("fprintf");
4177 				goto done;
4178 			}
4179 			outoff += n;
4180 			err = add_line_offset(line_offsets, nlines, outoff);
4181 			if (err)
4182 				goto done;
4183 			free(id_str);
4184 			id_str = NULL;
4185 		}
4186 	}
4187 
4188 	err = got_object_commit_get_logmsg(&logmsg, commit);
4189 	if (err)
4190 		goto done;
4191 	s = logmsg;
4192 	while ((line = strsep(&s, "\n")) != NULL) {
4193 		n = fprintf(outfile, "%s\n", line);
4194 		if (n < 0) {
4195 			err = got_error_from_errno("fprintf");
4196 			goto done;
4197 		}
4198 		outoff += n;
4199 		err = add_line_offset(line_offsets, nlines, outoff);
4200 		if (err)
4201 			goto done;
4202 	}
4203 
4204 	err = get_changed_paths(&changed_paths, commit, repo);
4205 	if (err)
4206 		goto done;
4207 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4208 		struct got_diff_changed_path *cp = pe->data;
4209 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4210 		if (n < 0) {
4211 			err = got_error_from_errno("fprintf");
4212 			goto done;
4213 		}
4214 		outoff += n;
4215 		err = add_line_offset(line_offsets, nlines, outoff);
4216 		if (err)
4217 			goto done;
4218 		free((char *)pe->path);
4219 		free(pe->data);
4220 	}
4221 
4222 	fputc('\n', outfile);
4223 	outoff++;
4224 	err = add_line_offset(line_offsets, nlines, outoff);
4225 done:
4226 	got_pathlist_free(&changed_paths);
4227 	free(id_str);
4228 	free(logmsg);
4229 	free(refs_str);
4230 	got_object_commit_close(commit);
4231 	if (err) {
4232 		free(*line_offsets);
4233 		*line_offsets = NULL;
4234 		*nlines = 0;
4235 	}
4236 	return err;
4237 }
4238 
4239 static const struct got_error *
4240 create_diff(struct tog_diff_view_state *s)
4241 {
4242 	const struct got_error *err = NULL;
4243 	FILE *f = NULL;
4244 	int obj_type;
4245 
4246 	free(s->line_offsets);
4247 	s->line_offsets = malloc(sizeof(off_t));
4248 	if (s->line_offsets == NULL)
4249 		return got_error_from_errno("malloc");
4250 	s->nlines = 0;
4251 
4252 	f = got_opentemp();
4253 	if (f == NULL) {
4254 		err = got_error_from_errno("got_opentemp");
4255 		goto done;
4256 	}
4257 	if (s->f && fclose(s->f) == EOF) {
4258 		err = got_error_from_errno("fclose");
4259 		goto done;
4260 	}
4261 	s->f = f;
4262 
4263 	if (s->id1)
4264 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4265 	else
4266 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4267 	if (err)
4268 		goto done;
4269 
4270 	switch (obj_type) {
4271 	case GOT_OBJ_TYPE_BLOB:
4272 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4273 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4274 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4275 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4276 		break;
4277 	case GOT_OBJ_TYPE_TREE:
4278 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4279 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4280 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4281 		    s->force_text_diff, s->repo, s->f);
4282 		break;
4283 	case GOT_OBJ_TYPE_COMMIT: {
4284 		const struct got_object_id_queue *parent_ids;
4285 		struct got_object_qid *pid;
4286 		struct got_commit_object *commit2;
4287 		struct got_reflist_head *refs;
4288 
4289 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4290 		if (err)
4291 			goto done;
4292 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4293 		/* Show commit info if we're diffing to a parent/root commit. */
4294 		if (s->id1 == NULL) {
4295 			err = write_commit_info(&s->line_offsets, &s->nlines,
4296 			    s->id2, refs, s->repo, s->f);
4297 			if (err)
4298 				goto done;
4299 		} else {
4300 			parent_ids = got_object_commit_get_parent_ids(commit2);
4301 			STAILQ_FOREACH(pid, parent_ids, entry) {
4302 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4303 					err = write_commit_info(
4304 					    &s->line_offsets, &s->nlines,
4305 					    s->id2, refs, s->repo, s->f);
4306 					if (err)
4307 						goto done;
4308 					break;
4309 				}
4310 			}
4311 		}
4312 		got_object_commit_close(commit2);
4313 
4314 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4315 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4316 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4317 		    s->force_text_diff, s->repo, s->f);
4318 		break;
4319 	}
4320 	default:
4321 		err = got_error(GOT_ERR_OBJ_TYPE);
4322 		break;
4323 	}
4324 	if (err)
4325 		goto done;
4326 done:
4327 	if (s->f && fflush(s->f) != 0 && err == NULL)
4328 		err = got_error_from_errno("fflush");
4329 	return err;
4330 }
4331 
4332 static void
4333 diff_view_indicate_progress(struct tog_view *view)
4334 {
4335 	mvwaddstr(view->window, 0, 0, "diffing...");
4336 	update_panels();
4337 	doupdate();
4338 }
4339 
4340 static const struct got_error *
4341 search_start_diff_view(struct tog_view *view)
4342 {
4343 	struct tog_diff_view_state *s = &view->state.diff;
4344 
4345 	s->matched_line = 0;
4346 	return NULL;
4347 }
4348 
4349 static const struct got_error *
4350 search_next_diff_view(struct tog_view *view)
4351 {
4352 	struct tog_diff_view_state *s = &view->state.diff;
4353 	const struct got_error *err = NULL;
4354 	int lineno;
4355 	char *line = NULL;
4356 	size_t linesize = 0;
4357 	ssize_t linelen;
4358 
4359 	if (!view->searching) {
4360 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4361 		return NULL;
4362 	}
4363 
4364 	if (s->matched_line) {
4365 		if (view->searching == TOG_SEARCH_FORWARD)
4366 			lineno = s->matched_line + 1;
4367 		else
4368 			lineno = s->matched_line - 1;
4369 	} else
4370 		lineno = s->first_displayed_line;
4371 
4372 	while (1) {
4373 		off_t offset;
4374 
4375 		if (lineno <= 0 || lineno > s->nlines) {
4376 			if (s->matched_line == 0) {
4377 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4378 				break;
4379 			}
4380 
4381 			if (view->searching == TOG_SEARCH_FORWARD)
4382 				lineno = 1;
4383 			else
4384 				lineno = s->nlines;
4385 		}
4386 
4387 		offset = s->line_offsets[lineno - 1];
4388 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4389 			free(line);
4390 			return got_error_from_errno("fseeko");
4391 		}
4392 		linelen = getline(&line, &linesize, s->f);
4393 		if (linelen != -1) {
4394 			char *exstr;
4395 			err = expand_tab(&exstr, line);
4396 			if (err)
4397 				break;
4398 			if (match_line(exstr, &view->regex, 1,
4399 			    &view->regmatch)) {
4400 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4401 				s->matched_line = lineno;
4402 				free(exstr);
4403 				break;
4404 			}
4405 			free(exstr);
4406 		}
4407 		if (view->searching == TOG_SEARCH_FORWARD)
4408 			lineno++;
4409 		else
4410 			lineno--;
4411 	}
4412 	free(line);
4413 
4414 	if (s->matched_line) {
4415 		s->first_displayed_line = s->matched_line;
4416 		s->selected_line = 1;
4417 	}
4418 
4419 	return err;
4420 }
4421 
4422 static const struct got_error *
4423 close_diff_view(struct tog_view *view)
4424 {
4425 	const struct got_error *err = NULL;
4426 	struct tog_diff_view_state *s = &view->state.diff;
4427 
4428 	free(s->id1);
4429 	s->id1 = NULL;
4430 	free(s->id2);
4431 	s->id2 = NULL;
4432 	if (s->f && fclose(s->f) == EOF)
4433 		err = got_error_from_errno("fclose");
4434 	s->f = NULL;
4435 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4436 		err = got_error_from_errno("fclose");
4437 	s->f1 = NULL;
4438 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4439 		err = got_error_from_errno("fclose");
4440 	s->f2 = NULL;
4441 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4442 		err = got_error_from_errno("close");
4443 	s->fd1 = -1;
4444 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4445 		err = got_error_from_errno("close");
4446 	s->fd2 = -1;
4447 	free_colors(&s->colors);
4448 	free(s->line_offsets);
4449 	s->line_offsets = NULL;
4450 	s->nlines = 0;
4451 	return err;
4452 }
4453 
4454 static const struct got_error *
4455 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4456     struct got_object_id *id2, const char *label1, const char *label2,
4457     int diff_context, int ignore_whitespace, int force_text_diff,
4458     struct tog_view *parent_view, struct got_repository *repo)
4459 {
4460 	const struct got_error *err;
4461 	struct tog_diff_view_state *s = &view->state.diff;
4462 
4463 	memset(s, 0, sizeof(*s));
4464 	s->fd1 = -1;
4465 	s->fd2 = -1;
4466 
4467 	if (id1 != NULL && id2 != NULL) {
4468 	    int type1, type2;
4469 	    err = got_object_get_type(&type1, repo, id1);
4470 	    if (err)
4471 		return err;
4472 	    err = got_object_get_type(&type2, repo, id2);
4473 	    if (err)
4474 		return err;
4475 
4476 	    if (type1 != type2)
4477 		return got_error(GOT_ERR_OBJ_TYPE);
4478 	}
4479 	s->first_displayed_line = 1;
4480 	s->last_displayed_line = view->nlines;
4481 	s->selected_line = 1;
4482 	s->repo = repo;
4483 	s->id1 = id1;
4484 	s->id2 = id2;
4485 	s->label1 = label1;
4486 	s->label2 = label2;
4487 
4488 	if (id1) {
4489 		s->id1 = got_object_id_dup(id1);
4490 		if (s->id1 == NULL)
4491 			return got_error_from_errno("got_object_id_dup");
4492 	} else
4493 		s->id1 = NULL;
4494 
4495 	s->id2 = got_object_id_dup(id2);
4496 	if (s->id2 == NULL) {
4497 		err = got_error_from_errno("got_object_id_dup");
4498 		goto done;
4499 	}
4500 
4501 	s->f1 = got_opentemp();
4502 	if (s->f1 == NULL) {
4503 		err = got_error_from_errno("got_opentemp");
4504 		goto done;
4505 	}
4506 
4507 	s->f2 = got_opentemp();
4508 	if (s->f2 == NULL) {
4509 		err = got_error_from_errno("got_opentemp");
4510 		goto done;
4511 	}
4512 
4513 	s->fd1 = got_opentempfd();
4514 	if (s->fd1 == -1) {
4515 		err = got_error_from_errno("got_opentempfd");
4516 		goto done;
4517 	}
4518 
4519 	s->fd2 = got_opentempfd();
4520 	if (s->fd2 == -1) {
4521 		err = got_error_from_errno("got_opentempfd");
4522 		goto done;
4523 	}
4524 
4525 	s->first_displayed_line = 1;
4526 	s->last_displayed_line = view->nlines;
4527 	s->diff_context = diff_context;
4528 	s->ignore_whitespace = ignore_whitespace;
4529 	s->force_text_diff = force_text_diff;
4530 	s->parent_view = parent_view;
4531 	s->repo = repo;
4532 
4533 	STAILQ_INIT(&s->colors);
4534 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4535 		err = add_color(&s->colors,
4536 		    "^-", TOG_COLOR_DIFF_MINUS,
4537 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4538 		if (err)
4539 			goto done;
4540 		err = add_color(&s->colors, "^\\+",
4541 		    TOG_COLOR_DIFF_PLUS,
4542 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4543 		if (err)
4544 			goto done;
4545 		err = add_color(&s->colors,
4546 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4547 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4548 		if (err)
4549 			goto done;
4550 
4551 		err = add_color(&s->colors,
4552 		    "^(commit [0-9a-f]|parent [0-9]|"
4553 		    "(blob|file|tree|commit) [-+] |"
4554 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4555 		    get_color_value("TOG_COLOR_DIFF_META"));
4556 		if (err)
4557 			goto done;
4558 
4559 		err = add_color(&s->colors,
4560 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4561 		    get_color_value("TOG_COLOR_AUTHOR"));
4562 		if (err)
4563 			goto done;
4564 
4565 		err = add_color(&s->colors,
4566 		    "^date: ", TOG_COLOR_DATE,
4567 		    get_color_value("TOG_COLOR_DATE"));
4568 		if (err)
4569 			goto done;
4570 	}
4571 
4572 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4573 	    view_is_splitscreen(view))
4574 		show_log_view(parent_view); /* draw border */
4575 	diff_view_indicate_progress(view);
4576 
4577 	err = create_diff(s);
4578 
4579 	view->show = show_diff_view;
4580 	view->input = input_diff_view;
4581 	view->reset = reset_diff_view;
4582 	view->close = close_diff_view;
4583 	view->search_start = search_start_diff_view;
4584 	view->search_next = search_next_diff_view;
4585 done:
4586 	if (err)
4587 		close_diff_view(view);
4588 	return err;
4589 }
4590 
4591 static const struct got_error *
4592 show_diff_view(struct tog_view *view)
4593 {
4594 	const struct got_error *err;
4595 	struct tog_diff_view_state *s = &view->state.diff;
4596 	char *id_str1 = NULL, *id_str2, *header;
4597 	const char *label1, *label2;
4598 
4599 	if (s->id1) {
4600 		err = got_object_id_str(&id_str1, s->id1);
4601 		if (err)
4602 			return err;
4603 		label1 = s->label1 ? : id_str1;
4604 	} else
4605 		label1 = "/dev/null";
4606 
4607 	err = got_object_id_str(&id_str2, s->id2);
4608 	if (err)
4609 		return err;
4610 	label2 = s->label2 ? : id_str2;
4611 
4612 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4613 		err = got_error_from_errno("asprintf");
4614 		free(id_str1);
4615 		free(id_str2);
4616 		return err;
4617 	}
4618 	free(id_str1);
4619 	free(id_str2);
4620 
4621 	err = draw_file(view, header);
4622 	free(header);
4623 	return err;
4624 }
4625 
4626 static const struct got_error *
4627 set_selected_commit(struct tog_diff_view_state *s,
4628     struct commit_queue_entry *entry)
4629 {
4630 	const struct got_error *err;
4631 	const struct got_object_id_queue *parent_ids;
4632 	struct got_commit_object *selected_commit;
4633 	struct got_object_qid *pid;
4634 
4635 	free(s->id2);
4636 	s->id2 = got_object_id_dup(entry->id);
4637 	if (s->id2 == NULL)
4638 		return got_error_from_errno("got_object_id_dup");
4639 
4640 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4641 	if (err)
4642 		return err;
4643 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4644 	free(s->id1);
4645 	pid = STAILQ_FIRST(parent_ids);
4646 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4647 	got_object_commit_close(selected_commit);
4648 	return NULL;
4649 }
4650 
4651 static const struct got_error *
4652 reset_diff_view(struct tog_view *view)
4653 {
4654 	struct tog_diff_view_state *s = &view->state.diff;
4655 
4656 	view->count = 0;
4657 	wclear(view->window);
4658 	s->first_displayed_line = 1;
4659 	s->last_displayed_line = view->nlines;
4660 	s->matched_line = 0;
4661 	diff_view_indicate_progress(view);
4662 	return create_diff(s);
4663 }
4664 
4665 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4666     int, int, int);
4667 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4668     int, int);
4669 
4670 static const struct got_error *
4671 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4672 {
4673 	const struct got_error *err = NULL;
4674 	struct tog_diff_view_state *s = &view->state.diff;
4675 	struct tog_log_view_state *ls;
4676 	struct commit_queue_entry *old_selected_entry;
4677 	char *line = NULL;
4678 	size_t linesize = 0;
4679 	ssize_t linelen;
4680 	int i, nscroll = view->nlines - 1, up = 0;
4681 
4682 	switch (ch) {
4683 	case '0':
4684 		view->x = 0;
4685 		break;
4686 	case '$':
4687 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4688 		view->count = 0;
4689 		break;
4690 	case KEY_RIGHT:
4691 	case 'l':
4692 		if (view->x + view->ncols / 3 < view->maxx)
4693 			view->x += 2;  /* move two columns right */
4694 		else
4695 			view->count = 0;
4696 		break;
4697 	case KEY_LEFT:
4698 	case 'h':
4699 		view->x -= MIN(view->x, 2);  /* move two columns back */
4700 		if (view->x <= 0)
4701 			view->count = 0;
4702 		break;
4703 	case 'a':
4704 	case 'w':
4705 		if (ch == 'a')
4706 			s->force_text_diff = !s->force_text_diff;
4707 		if (ch == 'w')
4708 			s->ignore_whitespace = !s->ignore_whitespace;
4709 		err = reset_diff_view(view);
4710 		break;
4711 	case 'g':
4712 	case KEY_HOME:
4713 		s->first_displayed_line = 1;
4714 		view->count = 0;
4715 		break;
4716 	case 'G':
4717 	case KEY_END:
4718 		view->count = 0;
4719 		if (s->eof)
4720 			break;
4721 
4722 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4723 		s->eof = 1;
4724 		break;
4725 	case 'k':
4726 	case KEY_UP:
4727 	case CTRL('p'):
4728 		if (s->first_displayed_line > 1)
4729 			s->first_displayed_line--;
4730 		else
4731 			view->count = 0;
4732 		break;
4733 	case CTRL('u'):
4734 	case 'u':
4735 		nscroll /= 2;
4736 		/* FALL THROUGH */
4737 	case KEY_PPAGE:
4738 	case CTRL('b'):
4739 	case 'b':
4740 		if (s->first_displayed_line == 1) {
4741 			view->count = 0;
4742 			break;
4743 		}
4744 		i = 0;
4745 		while (i++ < nscroll && s->first_displayed_line > 1)
4746 			s->first_displayed_line--;
4747 		break;
4748 	case 'j':
4749 	case KEY_DOWN:
4750 	case CTRL('n'):
4751 		if (!s->eof)
4752 			s->first_displayed_line++;
4753 		else
4754 			view->count = 0;
4755 		break;
4756 	case CTRL('d'):
4757 	case 'd':
4758 		nscroll /= 2;
4759 		/* FALL THROUGH */
4760 	case KEY_NPAGE:
4761 	case CTRL('f'):
4762 	case 'f':
4763 	case ' ':
4764 		if (s->eof) {
4765 			view->count = 0;
4766 			break;
4767 		}
4768 		i = 0;
4769 		while (!s->eof && i++ < nscroll) {
4770 			linelen = getline(&line, &linesize, s->f);
4771 			s->first_displayed_line++;
4772 			if (linelen == -1) {
4773 				if (feof(s->f)) {
4774 					s->eof = 1;
4775 				} else
4776 					err = got_ferror(s->f, GOT_ERR_IO);
4777 				break;
4778 			}
4779 		}
4780 		free(line);
4781 		break;
4782 	case '[':
4783 		if (s->diff_context > 0) {
4784 			s->diff_context--;
4785 			s->matched_line = 0;
4786 			diff_view_indicate_progress(view);
4787 			err = create_diff(s);
4788 			if (s->first_displayed_line + view->nlines - 1 >
4789 			    s->nlines) {
4790 				s->first_displayed_line = 1;
4791 				s->last_displayed_line = view->nlines;
4792 			}
4793 		} else
4794 			view->count = 0;
4795 		break;
4796 	case ']':
4797 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4798 			s->diff_context++;
4799 			s->matched_line = 0;
4800 			diff_view_indicate_progress(view);
4801 			err = create_diff(s);
4802 		} else
4803 			view->count = 0;
4804 		break;
4805 	case '<':
4806 	case ',':
4807 		up = 1;
4808 		/* FALL THROUGH */
4809 	case '>':
4810 	case '.':
4811 		if (s->parent_view == NULL) {
4812 			view->count = 0;
4813 			break;
4814 		}
4815 		s->parent_view->count = view->count;
4816 
4817 		if (s->parent_view->type == TOG_VIEW_LOG) {
4818 			ls = &s->parent_view->state.log;
4819 			old_selected_entry = ls->selected_entry;
4820 
4821 			err = input_log_view(NULL, s->parent_view,
4822 			    up ? KEY_UP : KEY_DOWN);
4823 			if (err)
4824 				break;
4825 			view->count = s->parent_view->count;
4826 
4827 			if (old_selected_entry == ls->selected_entry)
4828 				break;
4829 
4830 			err = set_selected_commit(s, ls->selected_entry);
4831 			if (err)
4832 				break;
4833 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4834 			struct tog_blame_view_state *bs;
4835 			struct got_object_id *id, *prev_id;
4836 
4837 			bs = &s->parent_view->state.blame;
4838 			prev_id = get_annotation_for_line(bs->blame.lines,
4839 			    bs->blame.nlines, bs->last_diffed_line);
4840 
4841 			err = input_blame_view(&view, s->parent_view,
4842 			    up ? KEY_UP : KEY_DOWN);
4843 			if (err)
4844 				break;
4845 			view->count = s->parent_view->count;
4846 
4847 			if (prev_id == NULL)
4848 				break;
4849 			id = get_selected_commit_id(bs->blame.lines,
4850 			    bs->blame.nlines, bs->first_displayed_line,
4851 			    bs->selected_line);
4852 			if (id == NULL)
4853 				break;
4854 
4855 			if (!got_object_id_cmp(prev_id, id))
4856 				break;
4857 
4858 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4859 			if (err)
4860 				break;
4861 		}
4862 		s->first_displayed_line = 1;
4863 		s->last_displayed_line = view->nlines;
4864 		s->matched_line = 0;
4865 		view->x = 0;
4866 
4867 		diff_view_indicate_progress(view);
4868 		err = create_diff(s);
4869 		break;
4870 	default:
4871 		view->count = 0;
4872 		break;
4873 	}
4874 
4875 	return err;
4876 }
4877 
4878 static const struct got_error *
4879 cmd_diff(int argc, char *argv[])
4880 {
4881 	const struct got_error *error = NULL;
4882 	struct got_repository *repo = NULL;
4883 	struct got_worktree *worktree = NULL;
4884 	struct got_object_id *id1 = NULL, *id2 = NULL;
4885 	char *repo_path = NULL, *cwd = NULL;
4886 	char *id_str1 = NULL, *id_str2 = NULL;
4887 	char *label1 = NULL, *label2 = NULL;
4888 	int diff_context = 3, ignore_whitespace = 0;
4889 	int ch, force_text_diff = 0;
4890 	const char *errstr;
4891 	struct tog_view *view;
4892 	int *pack_fds = NULL;
4893 
4894 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4895 		switch (ch) {
4896 		case 'a':
4897 			force_text_diff = 1;
4898 			break;
4899 		case 'C':
4900 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4901 			    &errstr);
4902 			if (errstr != NULL)
4903 				errx(1, "number of context lines is %s: %s",
4904 				    errstr, errstr);
4905 			break;
4906 		case 'r':
4907 			repo_path = realpath(optarg, NULL);
4908 			if (repo_path == NULL)
4909 				return got_error_from_errno2("realpath",
4910 				    optarg);
4911 			got_path_strip_trailing_slashes(repo_path);
4912 			break;
4913 		case 'w':
4914 			ignore_whitespace = 1;
4915 			break;
4916 		default:
4917 			usage_diff();
4918 			/* NOTREACHED */
4919 		}
4920 	}
4921 
4922 	argc -= optind;
4923 	argv += optind;
4924 
4925 	if (argc == 0) {
4926 		usage_diff(); /* TODO show local worktree changes */
4927 	} else if (argc == 2) {
4928 		id_str1 = argv[0];
4929 		id_str2 = argv[1];
4930 	} else
4931 		usage_diff();
4932 
4933 	error = got_repo_pack_fds_open(&pack_fds);
4934 	if (error)
4935 		goto done;
4936 
4937 	if (repo_path == NULL) {
4938 		cwd = getcwd(NULL, 0);
4939 		if (cwd == NULL)
4940 			return got_error_from_errno("getcwd");
4941 		error = got_worktree_open(&worktree, cwd);
4942 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4943 			goto done;
4944 		if (worktree)
4945 			repo_path =
4946 			    strdup(got_worktree_get_repo_path(worktree));
4947 		else
4948 			repo_path = strdup(cwd);
4949 		if (repo_path == NULL) {
4950 			error = got_error_from_errno("strdup");
4951 			goto done;
4952 		}
4953 	}
4954 
4955 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4956 	if (error)
4957 		goto done;
4958 
4959 	init_curses();
4960 
4961 	error = apply_unveil(got_repo_get_path(repo), NULL);
4962 	if (error)
4963 		goto done;
4964 
4965 	error = tog_load_refs(repo, 0);
4966 	if (error)
4967 		goto done;
4968 
4969 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4970 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4971 	if (error)
4972 		goto done;
4973 
4974 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4975 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4976 	if (error)
4977 		goto done;
4978 
4979 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4980 	if (view == NULL) {
4981 		error = got_error_from_errno("view_open");
4982 		goto done;
4983 	}
4984 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4985 	    ignore_whitespace, force_text_diff, NULL,  repo);
4986 	if (error)
4987 		goto done;
4988 	error = view_loop(view);
4989 done:
4990 	free(label1);
4991 	free(label2);
4992 	free(repo_path);
4993 	free(cwd);
4994 	if (repo) {
4995 		const struct got_error *close_err = got_repo_close(repo);
4996 		if (error == NULL)
4997 			error = close_err;
4998 	}
4999 	if (worktree)
5000 		got_worktree_close(worktree);
5001 	if (pack_fds) {
5002 		const struct got_error *pack_err =
5003 		    got_repo_pack_fds_close(pack_fds);
5004 		if (error == NULL)
5005 			error = pack_err;
5006 	}
5007 	tog_free_refs();
5008 	return error;
5009 }
5010 
5011 __dead static void
5012 usage_blame(void)
5013 {
5014 	endwin();
5015 	fprintf(stderr,
5016 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5017 	    getprogname());
5018 	exit(1);
5019 }
5020 
5021 struct tog_blame_line {
5022 	int annotated;
5023 	struct got_object_id *id;
5024 };
5025 
5026 static const struct got_error *
5027 draw_blame(struct tog_view *view)
5028 {
5029 	struct tog_blame_view_state *s = &view->state.blame;
5030 	struct tog_blame *blame = &s->blame;
5031 	regmatch_t *regmatch = &view->regmatch;
5032 	const struct got_error *err;
5033 	int lineno = 0, nprinted = 0;
5034 	char *line = NULL;
5035 	size_t linesize = 0;
5036 	ssize_t linelen;
5037 	wchar_t *wline;
5038 	int width;
5039 	struct tog_blame_line *blame_line;
5040 	struct got_object_id *prev_id = NULL;
5041 	char *id_str;
5042 	struct tog_color *tc;
5043 
5044 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5045 	if (err)
5046 		return err;
5047 
5048 	rewind(blame->f);
5049 	werase(view->window);
5050 
5051 	if (asprintf(&line, "commit %s", id_str) == -1) {
5052 		err = got_error_from_errno("asprintf");
5053 		free(id_str);
5054 		return err;
5055 	}
5056 
5057 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5058 	free(line);
5059 	line = NULL;
5060 	if (err)
5061 		return err;
5062 	if (view_needs_focus_indication(view))
5063 		wstandout(view->window);
5064 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5065 	if (tc)
5066 		wattr_on(view->window,
5067 		    COLOR_PAIR(tc->colorpair), NULL);
5068 	waddwstr(view->window, wline);
5069 	if (tc)
5070 		wattr_off(view->window,
5071 		    COLOR_PAIR(tc->colorpair), NULL);
5072 	if (view_needs_focus_indication(view))
5073 		wstandend(view->window);
5074 	free(wline);
5075 	wline = NULL;
5076 	if (width < view->ncols - 1)
5077 		waddch(view->window, '\n');
5078 
5079 	if (asprintf(&line, "[%d/%d] %s%s",
5080 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5081 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5082 		free(id_str);
5083 		return got_error_from_errno("asprintf");
5084 	}
5085 	free(id_str);
5086 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5087 	free(line);
5088 	line = NULL;
5089 	if (err)
5090 		return err;
5091 	waddwstr(view->window, wline);
5092 	free(wline);
5093 	wline = NULL;
5094 	if (width < view->ncols - 1)
5095 		waddch(view->window, '\n');
5096 
5097 	s->eof = 0;
5098 	view->maxx = 0;
5099 	while (nprinted < view->nlines - 2) {
5100 		linelen = getline(&line, &linesize, blame->f);
5101 		if (linelen == -1) {
5102 			if (feof(blame->f)) {
5103 				s->eof = 1;
5104 				break;
5105 			}
5106 			free(line);
5107 			return got_ferror(blame->f, GOT_ERR_IO);
5108 		}
5109 		if (++lineno < s->first_displayed_line)
5110 			continue;
5111 
5112 		/* Set view->maxx based on full line length. */
5113 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5114 		if (err) {
5115 			free(line);
5116 			return err;
5117 		}
5118 		free(wline);
5119 		wline = NULL;
5120 		view->maxx = MAX(view->maxx, width);
5121 
5122 		if (nprinted == s->selected_line - 1)
5123 			wstandout(view->window);
5124 
5125 		if (blame->nlines > 0) {
5126 			blame_line = &blame->lines[lineno - 1];
5127 			if (blame_line->annotated && prev_id &&
5128 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5129 			    !(nprinted == s->selected_line - 1)) {
5130 				waddstr(view->window, "        ");
5131 			} else if (blame_line->annotated) {
5132 				char *id_str;
5133 				err = got_object_id_str(&id_str,
5134 				    blame_line->id);
5135 				if (err) {
5136 					free(line);
5137 					return err;
5138 				}
5139 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5140 				if (tc)
5141 					wattr_on(view->window,
5142 					    COLOR_PAIR(tc->colorpair), NULL);
5143 				wprintw(view->window, "%.8s", id_str);
5144 				if (tc)
5145 					wattr_off(view->window,
5146 					    COLOR_PAIR(tc->colorpair), NULL);
5147 				free(id_str);
5148 				prev_id = blame_line->id;
5149 			} else {
5150 				waddstr(view->window, "........");
5151 				prev_id = NULL;
5152 			}
5153 		} else {
5154 			waddstr(view->window, "........");
5155 			prev_id = NULL;
5156 		}
5157 
5158 		if (nprinted == s->selected_line - 1)
5159 			wstandend(view->window);
5160 		waddstr(view->window, " ");
5161 
5162 		if (view->ncols <= 9) {
5163 			width = 9;
5164 		} else if (s->first_displayed_line + nprinted ==
5165 		    s->matched_line &&
5166 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5167 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5168 			    view->window, view->x, regmatch);
5169 			if (err) {
5170 				free(line);
5171 				return err;
5172 			}
5173 			width += 9;
5174 		} else {
5175 			int skip;
5176 			err = format_line(&wline, &width, &skip, line,
5177 			    view->x, view->ncols - 9, 9, 1);
5178 			if (err) {
5179 				free(line);
5180 				return err;
5181 			}
5182 			waddwstr(view->window, &wline[skip]);
5183 			width += 9;
5184 			free(wline);
5185 			wline = NULL;
5186 		}
5187 
5188 		if (width <= view->ncols - 1)
5189 			waddch(view->window, '\n');
5190 		if (++nprinted == 1)
5191 			s->first_displayed_line = lineno;
5192 	}
5193 	free(line);
5194 	s->last_displayed_line = lineno;
5195 
5196 	view_border(view);
5197 
5198 	return NULL;
5199 }
5200 
5201 static const struct got_error *
5202 blame_cb(void *arg, int nlines, int lineno,
5203     struct got_commit_object *commit, struct got_object_id *id)
5204 {
5205 	const struct got_error *err = NULL;
5206 	struct tog_blame_cb_args *a = arg;
5207 	struct tog_blame_line *line;
5208 	int errcode;
5209 
5210 	if (nlines != a->nlines ||
5211 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5212 		return got_error(GOT_ERR_RANGE);
5213 
5214 	errcode = pthread_mutex_lock(&tog_mutex);
5215 	if (errcode)
5216 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5217 
5218 	if (*a->quit) {	/* user has quit the blame view */
5219 		err = got_error(GOT_ERR_ITER_COMPLETED);
5220 		goto done;
5221 	}
5222 
5223 	if (lineno == -1)
5224 		goto done; /* no change in this commit */
5225 
5226 	line = &a->lines[lineno - 1];
5227 	if (line->annotated)
5228 		goto done;
5229 
5230 	line->id = got_object_id_dup(id);
5231 	if (line->id == NULL) {
5232 		err = got_error_from_errno("got_object_id_dup");
5233 		goto done;
5234 	}
5235 	line->annotated = 1;
5236 done:
5237 	errcode = pthread_mutex_unlock(&tog_mutex);
5238 	if (errcode)
5239 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5240 	return err;
5241 }
5242 
5243 static void *
5244 blame_thread(void *arg)
5245 {
5246 	const struct got_error *err, *close_err;
5247 	struct tog_blame_thread_args *ta = arg;
5248 	struct tog_blame_cb_args *a = ta->cb_args;
5249 	int errcode, fd1 = -1, fd2 = -1;
5250 	FILE *f1 = NULL, *f2 = NULL;
5251 
5252 	fd1 = got_opentempfd();
5253 	if (fd1 == -1)
5254 		return (void *)got_error_from_errno("got_opentempfd");
5255 
5256 	fd2 = got_opentempfd();
5257 	if (fd2 == -1) {
5258 		err = got_error_from_errno("got_opentempfd");
5259 		goto done;
5260 	}
5261 
5262 	f1 = got_opentemp();
5263 	if (f1 == NULL) {
5264 		err = (void *)got_error_from_errno("got_opentemp");
5265 		goto done;
5266 	}
5267 	f2 = got_opentemp();
5268 	if (f2 == NULL) {
5269 		err = (void *)got_error_from_errno("got_opentemp");
5270 		goto done;
5271 	}
5272 
5273 	err = block_signals_used_by_main_thread();
5274 	if (err)
5275 		goto done;
5276 
5277 	err = got_blame(ta->path, a->commit_id, ta->repo,
5278 	    tog_diff_algo, blame_cb, ta->cb_args,
5279 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5280 	if (err && err->code == GOT_ERR_CANCELLED)
5281 		err = NULL;
5282 
5283 	errcode = pthread_mutex_lock(&tog_mutex);
5284 	if (errcode) {
5285 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5286 		goto done;
5287 	}
5288 
5289 	close_err = got_repo_close(ta->repo);
5290 	if (err == NULL)
5291 		err = close_err;
5292 	ta->repo = NULL;
5293 	*ta->complete = 1;
5294 
5295 	errcode = pthread_mutex_unlock(&tog_mutex);
5296 	if (errcode && err == NULL)
5297 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5298 
5299 done:
5300 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5301 		err = got_error_from_errno("close");
5302 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5303 		err = got_error_from_errno("close");
5304 	if (f1 && fclose(f1) == EOF && err == NULL)
5305 		err = got_error_from_errno("fclose");
5306 	if (f2 && fclose(f2) == EOF && err == NULL)
5307 		err = got_error_from_errno("fclose");
5308 
5309 	return (void *)err;
5310 }
5311 
5312 static struct got_object_id *
5313 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5314     int first_displayed_line, int selected_line)
5315 {
5316 	struct tog_blame_line *line;
5317 
5318 	if (nlines <= 0)
5319 		return NULL;
5320 
5321 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5322 	if (!line->annotated)
5323 		return NULL;
5324 
5325 	return line->id;
5326 }
5327 
5328 static struct got_object_id *
5329 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5330     int lineno)
5331 {
5332 	struct tog_blame_line *line;
5333 
5334 	if (nlines <= 0 || lineno >= nlines)
5335 		return NULL;
5336 
5337 	line = &lines[lineno - 1];
5338 	if (!line->annotated)
5339 		return NULL;
5340 
5341 	return line->id;
5342 }
5343 
5344 static const struct got_error *
5345 stop_blame(struct tog_blame *blame)
5346 {
5347 	const struct got_error *err = NULL;
5348 	int i;
5349 
5350 	if (blame->thread) {
5351 		int errcode;
5352 		errcode = pthread_mutex_unlock(&tog_mutex);
5353 		if (errcode)
5354 			return got_error_set_errno(errcode,
5355 			    "pthread_mutex_unlock");
5356 		errcode = pthread_join(blame->thread, (void **)&err);
5357 		if (errcode)
5358 			return got_error_set_errno(errcode, "pthread_join");
5359 		errcode = pthread_mutex_lock(&tog_mutex);
5360 		if (errcode)
5361 			return got_error_set_errno(errcode,
5362 			    "pthread_mutex_lock");
5363 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5364 			err = NULL;
5365 		blame->thread = 0; //NULL;
5366 	}
5367 	if (blame->thread_args.repo) {
5368 		const struct got_error *close_err;
5369 		close_err = got_repo_close(blame->thread_args.repo);
5370 		if (err == NULL)
5371 			err = close_err;
5372 		blame->thread_args.repo = NULL;
5373 	}
5374 	if (blame->f) {
5375 		if (fclose(blame->f) == EOF && err == NULL)
5376 			err = got_error_from_errno("fclose");
5377 		blame->f = NULL;
5378 	}
5379 	if (blame->lines) {
5380 		for (i = 0; i < blame->nlines; i++)
5381 			free(blame->lines[i].id);
5382 		free(blame->lines);
5383 		blame->lines = NULL;
5384 	}
5385 	free(blame->cb_args.commit_id);
5386 	blame->cb_args.commit_id = NULL;
5387 	if (blame->pack_fds) {
5388 		const struct got_error *pack_err =
5389 		    got_repo_pack_fds_close(blame->pack_fds);
5390 		if (err == NULL)
5391 			err = pack_err;
5392 		blame->pack_fds = NULL;
5393 	}
5394 	return err;
5395 }
5396 
5397 static const struct got_error *
5398 cancel_blame_view(void *arg)
5399 {
5400 	const struct got_error *err = NULL;
5401 	int *done = arg;
5402 	int errcode;
5403 
5404 	errcode = pthread_mutex_lock(&tog_mutex);
5405 	if (errcode)
5406 		return got_error_set_errno(errcode,
5407 		    "pthread_mutex_unlock");
5408 
5409 	if (*done)
5410 		err = got_error(GOT_ERR_CANCELLED);
5411 
5412 	errcode = pthread_mutex_unlock(&tog_mutex);
5413 	if (errcode)
5414 		return got_error_set_errno(errcode,
5415 		    "pthread_mutex_lock");
5416 
5417 	return err;
5418 }
5419 
5420 static const struct got_error *
5421 run_blame(struct tog_view *view)
5422 {
5423 	struct tog_blame_view_state *s = &view->state.blame;
5424 	struct tog_blame *blame = &s->blame;
5425 	const struct got_error *err = NULL;
5426 	struct got_commit_object *commit = NULL;
5427 	struct got_blob_object *blob = NULL;
5428 	struct got_repository *thread_repo = NULL;
5429 	struct got_object_id *obj_id = NULL;
5430 	int obj_type, fd = -1;
5431 	int *pack_fds = NULL;
5432 
5433 	err = got_object_open_as_commit(&commit, s->repo,
5434 	    &s->blamed_commit->id);
5435 	if (err)
5436 		return err;
5437 
5438 	fd = got_opentempfd();
5439 	if (fd == -1) {
5440 		err = got_error_from_errno("got_opentempfd");
5441 		goto done;
5442 	}
5443 
5444 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5445 	if (err)
5446 		goto done;
5447 
5448 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5449 	if (err)
5450 		goto done;
5451 
5452 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5453 		err = got_error(GOT_ERR_OBJ_TYPE);
5454 		goto done;
5455 	}
5456 
5457 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5458 	if (err)
5459 		goto done;
5460 	blame->f = got_opentemp();
5461 	if (blame->f == NULL) {
5462 		err = got_error_from_errno("got_opentemp");
5463 		goto done;
5464 	}
5465 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5466 	    &blame->line_offsets, blame->f, blob);
5467 	if (err)
5468 		goto done;
5469 	if (blame->nlines == 0) {
5470 		s->blame_complete = 1;
5471 		goto done;
5472 	}
5473 
5474 	/* Don't include \n at EOF in the blame line count. */
5475 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5476 		blame->nlines--;
5477 
5478 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5479 	if (blame->lines == NULL) {
5480 		err = got_error_from_errno("calloc");
5481 		goto done;
5482 	}
5483 
5484 	err = got_repo_pack_fds_open(&pack_fds);
5485 	if (err)
5486 		goto done;
5487 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5488 	    pack_fds);
5489 	if (err)
5490 		goto done;
5491 
5492 	blame->pack_fds = pack_fds;
5493 	blame->cb_args.view = view;
5494 	blame->cb_args.lines = blame->lines;
5495 	blame->cb_args.nlines = blame->nlines;
5496 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5497 	if (blame->cb_args.commit_id == NULL) {
5498 		err = got_error_from_errno("got_object_id_dup");
5499 		goto done;
5500 	}
5501 	blame->cb_args.quit = &s->done;
5502 
5503 	blame->thread_args.path = s->path;
5504 	blame->thread_args.repo = thread_repo;
5505 	blame->thread_args.cb_args = &blame->cb_args;
5506 	blame->thread_args.complete = &s->blame_complete;
5507 	blame->thread_args.cancel_cb = cancel_blame_view;
5508 	blame->thread_args.cancel_arg = &s->done;
5509 	s->blame_complete = 0;
5510 
5511 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5512 		s->first_displayed_line = 1;
5513 		s->last_displayed_line = view->nlines;
5514 		s->selected_line = 1;
5515 	}
5516 	s->matched_line = 0;
5517 
5518 done:
5519 	if (commit)
5520 		got_object_commit_close(commit);
5521 	if (fd != -1 && close(fd) == -1 && err == NULL)
5522 		err = got_error_from_errno("close");
5523 	if (blob)
5524 		got_object_blob_close(blob);
5525 	free(obj_id);
5526 	if (err)
5527 		stop_blame(blame);
5528 	return err;
5529 }
5530 
5531 static const struct got_error *
5532 open_blame_view(struct tog_view *view, char *path,
5533     struct got_object_id *commit_id, struct got_repository *repo)
5534 {
5535 	const struct got_error *err = NULL;
5536 	struct tog_blame_view_state *s = &view->state.blame;
5537 
5538 	STAILQ_INIT(&s->blamed_commits);
5539 
5540 	s->path = strdup(path);
5541 	if (s->path == NULL)
5542 		return got_error_from_errno("strdup");
5543 
5544 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5545 	if (err) {
5546 		free(s->path);
5547 		return err;
5548 	}
5549 
5550 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5551 	s->first_displayed_line = 1;
5552 	s->last_displayed_line = view->nlines;
5553 	s->selected_line = 1;
5554 	s->blame_complete = 0;
5555 	s->repo = repo;
5556 	s->commit_id = commit_id;
5557 	memset(&s->blame, 0, sizeof(s->blame));
5558 
5559 	STAILQ_INIT(&s->colors);
5560 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5561 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5562 		    get_color_value("TOG_COLOR_COMMIT"));
5563 		if (err)
5564 			return err;
5565 	}
5566 
5567 	view->show = show_blame_view;
5568 	view->input = input_blame_view;
5569 	view->reset = reset_blame_view;
5570 	view->close = close_blame_view;
5571 	view->search_start = search_start_blame_view;
5572 	view->search_next = search_next_blame_view;
5573 
5574 	return run_blame(view);
5575 }
5576 
5577 static const struct got_error *
5578 close_blame_view(struct tog_view *view)
5579 {
5580 	const struct got_error *err = NULL;
5581 	struct tog_blame_view_state *s = &view->state.blame;
5582 
5583 	if (s->blame.thread)
5584 		err = stop_blame(&s->blame);
5585 
5586 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5587 		struct got_object_qid *blamed_commit;
5588 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5589 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5590 		got_object_qid_free(blamed_commit);
5591 	}
5592 
5593 	free(s->path);
5594 	free_colors(&s->colors);
5595 	return err;
5596 }
5597 
5598 static const struct got_error *
5599 search_start_blame_view(struct tog_view *view)
5600 {
5601 	struct tog_blame_view_state *s = &view->state.blame;
5602 
5603 	s->matched_line = 0;
5604 	return NULL;
5605 }
5606 
5607 static const struct got_error *
5608 search_next_blame_view(struct tog_view *view)
5609 {
5610 	struct tog_blame_view_state *s = &view->state.blame;
5611 	const struct got_error *err = NULL;
5612 	int lineno;
5613 	char *line = NULL;
5614 	size_t linesize = 0;
5615 	ssize_t linelen;
5616 
5617 	if (!view->searching) {
5618 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5619 		return NULL;
5620 	}
5621 
5622 	if (s->matched_line) {
5623 		if (view->searching == TOG_SEARCH_FORWARD)
5624 			lineno = s->matched_line + 1;
5625 		else
5626 			lineno = s->matched_line - 1;
5627 	} else
5628 		lineno = s->first_displayed_line - 1 + s->selected_line;
5629 
5630 	while (1) {
5631 		off_t offset;
5632 
5633 		if (lineno <= 0 || lineno > s->blame.nlines) {
5634 			if (s->matched_line == 0) {
5635 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5636 				break;
5637 			}
5638 
5639 			if (view->searching == TOG_SEARCH_FORWARD)
5640 				lineno = 1;
5641 			else
5642 				lineno = s->blame.nlines;
5643 		}
5644 
5645 		offset = s->blame.line_offsets[lineno - 1];
5646 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5647 			free(line);
5648 			return got_error_from_errno("fseeko");
5649 		}
5650 		linelen = getline(&line, &linesize, s->blame.f);
5651 		if (linelen != -1) {
5652 			char *exstr;
5653 			err = expand_tab(&exstr, line);
5654 			if (err)
5655 				break;
5656 			if (match_line(exstr, &view->regex, 1,
5657 			    &view->regmatch)) {
5658 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5659 				s->matched_line = lineno;
5660 				free(exstr);
5661 				break;
5662 			}
5663 			free(exstr);
5664 		}
5665 		if (view->searching == TOG_SEARCH_FORWARD)
5666 			lineno++;
5667 		else
5668 			lineno--;
5669 	}
5670 	free(line);
5671 
5672 	if (s->matched_line) {
5673 		s->first_displayed_line = s->matched_line;
5674 		s->selected_line = 1;
5675 	}
5676 
5677 	return err;
5678 }
5679 
5680 static const struct got_error *
5681 show_blame_view(struct tog_view *view)
5682 {
5683 	const struct got_error *err = NULL;
5684 	struct tog_blame_view_state *s = &view->state.blame;
5685 	int errcode;
5686 
5687 	if (s->blame.thread == 0 && !s->blame_complete) {
5688 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5689 		    &s->blame.thread_args);
5690 		if (errcode)
5691 			return got_error_set_errno(errcode, "pthread_create");
5692 
5693 		halfdelay(1); /* fast refresh while annotating  */
5694 	}
5695 
5696 	if (s->blame_complete)
5697 		halfdelay(10); /* disable fast refresh */
5698 
5699 	err = draw_blame(view);
5700 
5701 	view_border(view);
5702 	return err;
5703 }
5704 
5705 static const struct got_error *
5706 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5707 {
5708 	const struct got_error *err = NULL, *thread_err = NULL;
5709 	struct tog_view *diff_view;
5710 	struct tog_blame_view_state *s = &view->state.blame;
5711 	int eos, nscroll, begin_y = 0, begin_x = 0;
5712 
5713 	eos = nscroll = view->nlines - 2;
5714 	if (view_is_hsplit_top(view))
5715 		--eos;  /* border */
5716 
5717 	switch (ch) {
5718 	case '0':
5719 		view->x = 0;
5720 		break;
5721 	case '$':
5722 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5723 		view->count = 0;
5724 		break;
5725 	case KEY_RIGHT:
5726 	case 'l':
5727 		if (view->x + view->ncols / 3 < view->maxx)
5728 			view->x += 2;  /* move two columns right */
5729 		else
5730 			view->count = 0;
5731 		break;
5732 	case KEY_LEFT:
5733 	case 'h':
5734 		view->x -= MIN(view->x, 2);  /* move two columns back */
5735 		if (view->x <= 0)
5736 			view->count = 0;
5737 		break;
5738 	case 'q':
5739 		s->done = 1;
5740 		break;
5741 	case 'g':
5742 	case KEY_HOME:
5743 		s->selected_line = 1;
5744 		s->first_displayed_line = 1;
5745 		view->count = 0;
5746 		break;
5747 	case 'G':
5748 	case KEY_END:
5749 		if (s->blame.nlines < eos) {
5750 			s->selected_line = s->blame.nlines;
5751 			s->first_displayed_line = 1;
5752 		} else {
5753 			s->selected_line = eos;
5754 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5755 		}
5756 		view->count = 0;
5757 		break;
5758 	case 'k':
5759 	case KEY_UP:
5760 	case CTRL('p'):
5761 		if (s->selected_line > 1)
5762 			s->selected_line--;
5763 		else if (s->selected_line == 1 &&
5764 		    s->first_displayed_line > 1)
5765 			s->first_displayed_line--;
5766 		else
5767 			view->count = 0;
5768 		break;
5769 	case CTRL('u'):
5770 	case 'u':
5771 		nscroll /= 2;
5772 		/* FALL THROUGH */
5773 	case KEY_PPAGE:
5774 	case CTRL('b'):
5775 	case 'b':
5776 		if (s->first_displayed_line == 1) {
5777 			if (view->count > 1)
5778 				nscroll += nscroll;
5779 			s->selected_line = MAX(1, s->selected_line - nscroll);
5780 			view->count = 0;
5781 			break;
5782 		}
5783 		if (s->first_displayed_line > nscroll)
5784 			s->first_displayed_line -= nscroll;
5785 		else
5786 			s->first_displayed_line = 1;
5787 		break;
5788 	case 'j':
5789 	case KEY_DOWN:
5790 	case CTRL('n'):
5791 		if (s->selected_line < eos && s->first_displayed_line +
5792 		    s->selected_line <= s->blame.nlines)
5793 			s->selected_line++;
5794 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5795 			s->first_displayed_line++;
5796 		else
5797 			view->count = 0;
5798 		break;
5799 	case 'c':
5800 	case 'p': {
5801 		struct got_object_id *id = NULL;
5802 
5803 		view->count = 0;
5804 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5805 		    s->first_displayed_line, s->selected_line);
5806 		if (id == NULL)
5807 			break;
5808 		if (ch == 'p') {
5809 			struct got_commit_object *commit, *pcommit;
5810 			struct got_object_qid *pid;
5811 			struct got_object_id *blob_id = NULL;
5812 			int obj_type;
5813 			err = got_object_open_as_commit(&commit,
5814 			    s->repo, id);
5815 			if (err)
5816 				break;
5817 			pid = STAILQ_FIRST(
5818 			    got_object_commit_get_parent_ids(commit));
5819 			if (pid == NULL) {
5820 				got_object_commit_close(commit);
5821 				break;
5822 			}
5823 			/* Check if path history ends here. */
5824 			err = got_object_open_as_commit(&pcommit,
5825 			    s->repo, &pid->id);
5826 			if (err)
5827 				break;
5828 			err = got_object_id_by_path(&blob_id, s->repo,
5829 			    pcommit, s->path);
5830 			got_object_commit_close(pcommit);
5831 			if (err) {
5832 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5833 					err = NULL;
5834 				got_object_commit_close(commit);
5835 				break;
5836 			}
5837 			err = got_object_get_type(&obj_type, s->repo,
5838 			    blob_id);
5839 			free(blob_id);
5840 			/* Can't blame non-blob type objects. */
5841 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5842 				got_object_commit_close(commit);
5843 				break;
5844 			}
5845 			err = got_object_qid_alloc(&s->blamed_commit,
5846 			    &pid->id);
5847 			got_object_commit_close(commit);
5848 		} else {
5849 			if (got_object_id_cmp(id,
5850 			    &s->blamed_commit->id) == 0)
5851 				break;
5852 			err = got_object_qid_alloc(&s->blamed_commit,
5853 			    id);
5854 		}
5855 		if (err)
5856 			break;
5857 		s->done = 1;
5858 		thread_err = stop_blame(&s->blame);
5859 		s->done = 0;
5860 		if (thread_err)
5861 			break;
5862 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5863 		    s->blamed_commit, entry);
5864 		err = run_blame(view);
5865 		if (err)
5866 			break;
5867 		break;
5868 	}
5869 	case 'C': {
5870 		struct got_object_qid *first;
5871 
5872 		view->count = 0;
5873 		first = STAILQ_FIRST(&s->blamed_commits);
5874 		if (!got_object_id_cmp(&first->id, s->commit_id))
5875 			break;
5876 		s->done = 1;
5877 		thread_err = stop_blame(&s->blame);
5878 		s->done = 0;
5879 		if (thread_err)
5880 			break;
5881 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5882 		got_object_qid_free(s->blamed_commit);
5883 		s->blamed_commit =
5884 		    STAILQ_FIRST(&s->blamed_commits);
5885 		err = run_blame(view);
5886 		if (err)
5887 			break;
5888 		break;
5889 	}
5890 	case KEY_ENTER:
5891 	case '\r': {
5892 		struct got_object_id *id = NULL;
5893 		struct got_object_qid *pid;
5894 		struct got_commit_object *commit = NULL;
5895 
5896 		view->count = 0;
5897 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5898 		    s->first_displayed_line, s->selected_line);
5899 		if (id == NULL)
5900 			break;
5901 		err = got_object_open_as_commit(&commit, s->repo, id);
5902 		if (err)
5903 			break;
5904 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5905 		if (*new_view) {
5906 			/* traversed from diff view, release diff resources  */
5907 			err = close_diff_view(*new_view);
5908 			if (err)
5909 				break;
5910 			diff_view = *new_view;
5911 		} else {
5912 			if (view_is_parent_view(view))
5913 				view_get_split(view, &begin_y, &begin_x);
5914 
5915 			diff_view = view_open(0, 0, begin_y, begin_x,
5916 			    TOG_VIEW_DIFF);
5917 			if (diff_view == NULL) {
5918 				got_object_commit_close(commit);
5919 				err = got_error_from_errno("view_open");
5920 				break;
5921 			}
5922 		}
5923 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5924 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
5925 		got_object_commit_close(commit);
5926 		if (err) {
5927 			view_close(diff_view);
5928 			break;
5929 		}
5930 		s->last_diffed_line = s->first_displayed_line - 1 +
5931 		    s->selected_line;
5932 		if (*new_view)
5933 			break;	/* still open from active diff view */
5934 		if (view_is_parent_view(view) &&
5935 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5936 			err = view_init_hsplit(view, begin_y);
5937 			if (err)
5938 				break;
5939 		}
5940 
5941 		view->focussed = 0;
5942 		diff_view->focussed = 1;
5943 		diff_view->mode = view->mode;
5944 		diff_view->nlines = view->lines - begin_y;
5945 		if (view_is_parent_view(view)) {
5946 			view_transfer_size(diff_view, view);
5947 			err = view_close_child(view);
5948 			if (err)
5949 				break;
5950 			err = view_set_child(view, diff_view);
5951 			if (err)
5952 				break;
5953 			view->focus_child = 1;
5954 		} else
5955 			*new_view = diff_view;
5956 		if (err)
5957 			break;
5958 		break;
5959 	}
5960 	case CTRL('d'):
5961 	case 'd':
5962 		nscroll /= 2;
5963 		/* FALL THROUGH */
5964 	case KEY_NPAGE:
5965 	case CTRL('f'):
5966 	case 'f':
5967 	case ' ':
5968 		if (s->last_displayed_line >= s->blame.nlines &&
5969 		    s->selected_line >= MIN(s->blame.nlines,
5970 		    view->nlines - 2)) {
5971 			view->count = 0;
5972 			break;
5973 		}
5974 		if (s->last_displayed_line >= s->blame.nlines &&
5975 		    s->selected_line < view->nlines - 2) {
5976 			s->selected_line +=
5977 			    MIN(nscroll, s->last_displayed_line -
5978 			    s->first_displayed_line - s->selected_line + 1);
5979 		}
5980 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5981 			s->first_displayed_line += nscroll;
5982 		else
5983 			s->first_displayed_line =
5984 			    s->blame.nlines - (view->nlines - 3);
5985 		break;
5986 	case KEY_RESIZE:
5987 		if (s->selected_line > view->nlines - 2) {
5988 			s->selected_line = MIN(s->blame.nlines,
5989 			    view->nlines - 2);
5990 		}
5991 		break;
5992 	default:
5993 		view->count = 0;
5994 		break;
5995 	}
5996 	return thread_err ? thread_err : err;
5997 }
5998 
5999 static const struct got_error *
6000 reset_blame_view(struct tog_view *view)
6001 {
6002 	const struct got_error *err;
6003 	struct tog_blame_view_state *s = &view->state.blame;
6004 
6005 	view->count = 0;
6006 	s->done = 1;
6007 	err = stop_blame(&s->blame);
6008 	s->done = 0;
6009 	if (err)
6010 		return err;
6011 	return run_blame(view);
6012 }
6013 
6014 static const struct got_error *
6015 cmd_blame(int argc, char *argv[])
6016 {
6017 	const struct got_error *error;
6018 	struct got_repository *repo = NULL;
6019 	struct got_worktree *worktree = NULL;
6020 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6021 	char *link_target = NULL;
6022 	struct got_object_id *commit_id = NULL;
6023 	struct got_commit_object *commit = NULL;
6024 	char *commit_id_str = NULL;
6025 	int ch;
6026 	struct tog_view *view;
6027 	int *pack_fds = NULL;
6028 
6029 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6030 		switch (ch) {
6031 		case 'c':
6032 			commit_id_str = optarg;
6033 			break;
6034 		case 'r':
6035 			repo_path = realpath(optarg, NULL);
6036 			if (repo_path == NULL)
6037 				return got_error_from_errno2("realpath",
6038 				    optarg);
6039 			break;
6040 		default:
6041 			usage_blame();
6042 			/* NOTREACHED */
6043 		}
6044 	}
6045 
6046 	argc -= optind;
6047 	argv += optind;
6048 
6049 	if (argc != 1)
6050 		usage_blame();
6051 
6052 	error = got_repo_pack_fds_open(&pack_fds);
6053 	if (error != NULL)
6054 		goto done;
6055 
6056 	if (repo_path == NULL) {
6057 		cwd = getcwd(NULL, 0);
6058 		if (cwd == NULL)
6059 			return got_error_from_errno("getcwd");
6060 		error = got_worktree_open(&worktree, cwd);
6061 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6062 			goto done;
6063 		if (worktree)
6064 			repo_path =
6065 			    strdup(got_worktree_get_repo_path(worktree));
6066 		else
6067 			repo_path = strdup(cwd);
6068 		if (repo_path == NULL) {
6069 			error = got_error_from_errno("strdup");
6070 			goto done;
6071 		}
6072 	}
6073 
6074 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6075 	if (error != NULL)
6076 		goto done;
6077 
6078 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6079 	    worktree);
6080 	if (error)
6081 		goto done;
6082 
6083 	init_curses();
6084 
6085 	error = apply_unveil(got_repo_get_path(repo), NULL);
6086 	if (error)
6087 		goto done;
6088 
6089 	error = tog_load_refs(repo, 0);
6090 	if (error)
6091 		goto done;
6092 
6093 	if (commit_id_str == NULL) {
6094 		struct got_reference *head_ref;
6095 		error = got_ref_open(&head_ref, repo, worktree ?
6096 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6097 		if (error != NULL)
6098 			goto done;
6099 		error = got_ref_resolve(&commit_id, repo, head_ref);
6100 		got_ref_close(head_ref);
6101 	} else {
6102 		error = got_repo_match_object_id(&commit_id, NULL,
6103 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6104 	}
6105 	if (error != NULL)
6106 		goto done;
6107 
6108 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6109 	if (view == NULL) {
6110 		error = got_error_from_errno("view_open");
6111 		goto done;
6112 	}
6113 
6114 	error = got_object_open_as_commit(&commit, repo, commit_id);
6115 	if (error)
6116 		goto done;
6117 
6118 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6119 	    commit, repo);
6120 	if (error)
6121 		goto done;
6122 
6123 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6124 	    commit_id, repo);
6125 	if (error)
6126 		goto done;
6127 	if (worktree) {
6128 		/* Release work tree lock. */
6129 		got_worktree_close(worktree);
6130 		worktree = NULL;
6131 	}
6132 	error = view_loop(view);
6133 done:
6134 	free(repo_path);
6135 	free(in_repo_path);
6136 	free(link_target);
6137 	free(cwd);
6138 	free(commit_id);
6139 	if (commit)
6140 		got_object_commit_close(commit);
6141 	if (worktree)
6142 		got_worktree_close(worktree);
6143 	if (repo) {
6144 		const struct got_error *close_err = got_repo_close(repo);
6145 		if (error == NULL)
6146 			error = close_err;
6147 	}
6148 	if (pack_fds) {
6149 		const struct got_error *pack_err =
6150 		    got_repo_pack_fds_close(pack_fds);
6151 		if (error == NULL)
6152 			error = pack_err;
6153 	}
6154 	tog_free_refs();
6155 	return error;
6156 }
6157 
6158 static const struct got_error *
6159 draw_tree_entries(struct tog_view *view, const char *parent_path)
6160 {
6161 	struct tog_tree_view_state *s = &view->state.tree;
6162 	const struct got_error *err = NULL;
6163 	struct got_tree_entry *te;
6164 	wchar_t *wline;
6165 	struct tog_color *tc;
6166 	int width, n, i, nentries;
6167 	int limit = view->nlines;
6168 
6169 	s->ndisplayed = 0;
6170 	if (view_is_hsplit_top(view))
6171 		--limit;  /* border */
6172 
6173 	werase(view->window);
6174 
6175 	if (limit == 0)
6176 		return NULL;
6177 
6178 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6179 	    0, 0);
6180 	if (err)
6181 		return err;
6182 	if (view_needs_focus_indication(view))
6183 		wstandout(view->window);
6184 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6185 	if (tc)
6186 		wattr_on(view->window,
6187 		    COLOR_PAIR(tc->colorpair), NULL);
6188 	waddwstr(view->window, wline);
6189 	if (tc)
6190 		wattr_off(view->window,
6191 		    COLOR_PAIR(tc->colorpair), NULL);
6192 	if (view_needs_focus_indication(view))
6193 		wstandend(view->window);
6194 	free(wline);
6195 	wline = NULL;
6196 	if (width < view->ncols - 1)
6197 		waddch(view->window, '\n');
6198 	if (--limit <= 0)
6199 		return NULL;
6200 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6201 	    0, 0);
6202 	if (err)
6203 		return err;
6204 	waddwstr(view->window, wline);
6205 	free(wline);
6206 	wline = NULL;
6207 	if (width < view->ncols - 1)
6208 		waddch(view->window, '\n');
6209 	if (--limit <= 0)
6210 		return NULL;
6211 	waddch(view->window, '\n');
6212 	if (--limit <= 0)
6213 		return NULL;
6214 
6215 	if (s->first_displayed_entry == NULL) {
6216 		te = got_object_tree_get_first_entry(s->tree);
6217 		if (s->selected == 0) {
6218 			if (view->focussed)
6219 				wstandout(view->window);
6220 			s->selected_entry = NULL;
6221 		}
6222 		waddstr(view->window, "  ..\n");	/* parent directory */
6223 		if (s->selected == 0 && view->focussed)
6224 			wstandend(view->window);
6225 		s->ndisplayed++;
6226 		if (--limit <= 0)
6227 			return NULL;
6228 		n = 1;
6229 	} else {
6230 		n = 0;
6231 		te = s->first_displayed_entry;
6232 	}
6233 
6234 	nentries = got_object_tree_get_nentries(s->tree);
6235 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6236 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6237 		const char *modestr = "";
6238 		mode_t mode;
6239 
6240 		te = got_object_tree_get_entry(s->tree, i);
6241 		mode = got_tree_entry_get_mode(te);
6242 
6243 		if (s->show_ids) {
6244 			err = got_object_id_str(&id_str,
6245 			    got_tree_entry_get_id(te));
6246 			if (err)
6247 				return got_error_from_errno(
6248 				    "got_object_id_str");
6249 		}
6250 		if (got_object_tree_entry_is_submodule(te))
6251 			modestr = "$";
6252 		else if (S_ISLNK(mode)) {
6253 			int i;
6254 
6255 			err = got_tree_entry_get_symlink_target(&link_target,
6256 			    te, s->repo);
6257 			if (err) {
6258 				free(id_str);
6259 				return err;
6260 			}
6261 			for (i = 0; i < strlen(link_target); i++) {
6262 				if (!isprint((unsigned char)link_target[i]))
6263 					link_target[i] = '?';
6264 			}
6265 			modestr = "@";
6266 		}
6267 		else if (S_ISDIR(mode))
6268 			modestr = "/";
6269 		else if (mode & S_IXUSR)
6270 			modestr = "*";
6271 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6272 		    got_tree_entry_get_name(te), modestr,
6273 		    link_target ? " -> ": "",
6274 		    link_target ? link_target : "") == -1) {
6275 			free(id_str);
6276 			free(link_target);
6277 			return got_error_from_errno("asprintf");
6278 		}
6279 		free(id_str);
6280 		free(link_target);
6281 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6282 		    0, 0);
6283 		if (err) {
6284 			free(line);
6285 			break;
6286 		}
6287 		if (n == s->selected) {
6288 			if (view->focussed)
6289 				wstandout(view->window);
6290 			s->selected_entry = te;
6291 		}
6292 		tc = match_color(&s->colors, line);
6293 		if (tc)
6294 			wattr_on(view->window,
6295 			    COLOR_PAIR(tc->colorpair), NULL);
6296 		waddwstr(view->window, wline);
6297 		if (tc)
6298 			wattr_off(view->window,
6299 			    COLOR_PAIR(tc->colorpair), NULL);
6300 		if (width < view->ncols - 1)
6301 			waddch(view->window, '\n');
6302 		if (n == s->selected && view->focussed)
6303 			wstandend(view->window);
6304 		free(line);
6305 		free(wline);
6306 		wline = NULL;
6307 		n++;
6308 		s->ndisplayed++;
6309 		s->last_displayed_entry = te;
6310 		if (--limit <= 0)
6311 			break;
6312 	}
6313 
6314 	return err;
6315 }
6316 
6317 static void
6318 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6319 {
6320 	struct got_tree_entry *te;
6321 	int isroot = s->tree == s->root;
6322 	int i = 0;
6323 
6324 	if (s->first_displayed_entry == NULL)
6325 		return;
6326 
6327 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6328 	while (i++ < maxscroll) {
6329 		if (te == NULL) {
6330 			if (!isroot)
6331 				s->first_displayed_entry = NULL;
6332 			break;
6333 		}
6334 		s->first_displayed_entry = te;
6335 		te = got_tree_entry_get_prev(s->tree, te);
6336 	}
6337 }
6338 
6339 static const struct got_error *
6340 tree_scroll_down(struct tog_view *view, int maxscroll)
6341 {
6342 	struct tog_tree_view_state *s = &view->state.tree;
6343 	struct got_tree_entry *next, *last;
6344 	int n = 0;
6345 
6346 	if (s->first_displayed_entry)
6347 		next = got_tree_entry_get_next(s->tree,
6348 		    s->first_displayed_entry);
6349 	else
6350 		next = got_object_tree_get_first_entry(s->tree);
6351 
6352 	last = s->last_displayed_entry;
6353 	while (next && n++ < maxscroll) {
6354 		if (last)
6355 			last = got_tree_entry_get_next(s->tree, last);
6356 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6357 			s->first_displayed_entry = next;
6358 			next = got_tree_entry_get_next(s->tree, next);
6359 		}
6360 	}
6361 
6362 	return NULL;
6363 }
6364 
6365 static const struct got_error *
6366 tree_entry_path(char **path, struct tog_parent_trees *parents,
6367     struct got_tree_entry *te)
6368 {
6369 	const struct got_error *err = NULL;
6370 	struct tog_parent_tree *pt;
6371 	size_t len = 2; /* for leading slash and NUL */
6372 
6373 	TAILQ_FOREACH(pt, parents, entry)
6374 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6375 		    + 1 /* slash */;
6376 	if (te)
6377 		len += strlen(got_tree_entry_get_name(te));
6378 
6379 	*path = calloc(1, len);
6380 	if (path == NULL)
6381 		return got_error_from_errno("calloc");
6382 
6383 	(*path)[0] = '/';
6384 	pt = TAILQ_LAST(parents, tog_parent_trees);
6385 	while (pt) {
6386 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6387 		if (strlcat(*path, name, len) >= len) {
6388 			err = got_error(GOT_ERR_NO_SPACE);
6389 			goto done;
6390 		}
6391 		if (strlcat(*path, "/", len) >= len) {
6392 			err = got_error(GOT_ERR_NO_SPACE);
6393 			goto done;
6394 		}
6395 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6396 	}
6397 	if (te) {
6398 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6399 			err = got_error(GOT_ERR_NO_SPACE);
6400 			goto done;
6401 		}
6402 	}
6403 done:
6404 	if (err) {
6405 		free(*path);
6406 		*path = NULL;
6407 	}
6408 	return err;
6409 }
6410 
6411 static const struct got_error *
6412 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6413     struct got_tree_entry *te, struct tog_parent_trees *parents,
6414     struct got_object_id *commit_id, struct got_repository *repo)
6415 {
6416 	const struct got_error *err = NULL;
6417 	char *path;
6418 	struct tog_view *blame_view;
6419 
6420 	*new_view = NULL;
6421 
6422 	err = tree_entry_path(&path, parents, te);
6423 	if (err)
6424 		return err;
6425 
6426 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6427 	if (blame_view == NULL) {
6428 		err = got_error_from_errno("view_open");
6429 		goto done;
6430 	}
6431 
6432 	err = open_blame_view(blame_view, path, commit_id, repo);
6433 	if (err) {
6434 		if (err->code == GOT_ERR_CANCELLED)
6435 			err = NULL;
6436 		view_close(blame_view);
6437 	} else
6438 		*new_view = blame_view;
6439 done:
6440 	free(path);
6441 	return err;
6442 }
6443 
6444 static const struct got_error *
6445 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6446     struct tog_tree_view_state *s)
6447 {
6448 	struct tog_view *log_view;
6449 	const struct got_error *err = NULL;
6450 	char *path;
6451 
6452 	*new_view = NULL;
6453 
6454 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6455 	if (log_view == NULL)
6456 		return got_error_from_errno("view_open");
6457 
6458 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6459 	if (err)
6460 		return err;
6461 
6462 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6463 	    path, 0);
6464 	if (err)
6465 		view_close(log_view);
6466 	else
6467 		*new_view = log_view;
6468 	free(path);
6469 	return err;
6470 }
6471 
6472 static const struct got_error *
6473 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6474     const char *head_ref_name, struct got_repository *repo)
6475 {
6476 	const struct got_error *err = NULL;
6477 	char *commit_id_str = NULL;
6478 	struct tog_tree_view_state *s = &view->state.tree;
6479 	struct got_commit_object *commit = NULL;
6480 
6481 	TAILQ_INIT(&s->parents);
6482 	STAILQ_INIT(&s->colors);
6483 
6484 	s->commit_id = got_object_id_dup(commit_id);
6485 	if (s->commit_id == NULL)
6486 		return got_error_from_errno("got_object_id_dup");
6487 
6488 	err = got_object_open_as_commit(&commit, repo, commit_id);
6489 	if (err)
6490 		goto done;
6491 
6492 	/*
6493 	 * The root is opened here and will be closed when the view is closed.
6494 	 * Any visited subtrees and their path-wise parents are opened and
6495 	 * closed on demand.
6496 	 */
6497 	err = got_object_open_as_tree(&s->root, repo,
6498 	    got_object_commit_get_tree_id(commit));
6499 	if (err)
6500 		goto done;
6501 	s->tree = s->root;
6502 
6503 	err = got_object_id_str(&commit_id_str, commit_id);
6504 	if (err != NULL)
6505 		goto done;
6506 
6507 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6508 		err = got_error_from_errno("asprintf");
6509 		goto done;
6510 	}
6511 
6512 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6513 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6514 	if (head_ref_name) {
6515 		s->head_ref_name = strdup(head_ref_name);
6516 		if (s->head_ref_name == NULL) {
6517 			err = got_error_from_errno("strdup");
6518 			goto done;
6519 		}
6520 	}
6521 	s->repo = repo;
6522 
6523 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6524 		err = add_color(&s->colors, "\\$$",
6525 		    TOG_COLOR_TREE_SUBMODULE,
6526 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6527 		if (err)
6528 			goto done;
6529 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6530 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6531 		if (err)
6532 			goto done;
6533 		err = add_color(&s->colors, "/$",
6534 		    TOG_COLOR_TREE_DIRECTORY,
6535 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6536 		if (err)
6537 			goto done;
6538 
6539 		err = add_color(&s->colors, "\\*$",
6540 		    TOG_COLOR_TREE_EXECUTABLE,
6541 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6542 		if (err)
6543 			goto done;
6544 
6545 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6546 		    get_color_value("TOG_COLOR_COMMIT"));
6547 		if (err)
6548 			goto done;
6549 	}
6550 
6551 	view->show = show_tree_view;
6552 	view->input = input_tree_view;
6553 	view->close = close_tree_view;
6554 	view->search_start = search_start_tree_view;
6555 	view->search_next = search_next_tree_view;
6556 done:
6557 	free(commit_id_str);
6558 	if (commit)
6559 		got_object_commit_close(commit);
6560 	if (err)
6561 		close_tree_view(view);
6562 	return err;
6563 }
6564 
6565 static const struct got_error *
6566 close_tree_view(struct tog_view *view)
6567 {
6568 	struct tog_tree_view_state *s = &view->state.tree;
6569 
6570 	free_colors(&s->colors);
6571 	free(s->tree_label);
6572 	s->tree_label = NULL;
6573 	free(s->commit_id);
6574 	s->commit_id = NULL;
6575 	free(s->head_ref_name);
6576 	s->head_ref_name = NULL;
6577 	while (!TAILQ_EMPTY(&s->parents)) {
6578 		struct tog_parent_tree *parent;
6579 		parent = TAILQ_FIRST(&s->parents);
6580 		TAILQ_REMOVE(&s->parents, parent, entry);
6581 		if (parent->tree != s->root)
6582 			got_object_tree_close(parent->tree);
6583 		free(parent);
6584 
6585 	}
6586 	if (s->tree != NULL && s->tree != s->root)
6587 		got_object_tree_close(s->tree);
6588 	if (s->root)
6589 		got_object_tree_close(s->root);
6590 	return NULL;
6591 }
6592 
6593 static const struct got_error *
6594 search_start_tree_view(struct tog_view *view)
6595 {
6596 	struct tog_tree_view_state *s = &view->state.tree;
6597 
6598 	s->matched_entry = NULL;
6599 	return NULL;
6600 }
6601 
6602 static int
6603 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6604 {
6605 	regmatch_t regmatch;
6606 
6607 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6608 	    0) == 0;
6609 }
6610 
6611 static const struct got_error *
6612 search_next_tree_view(struct tog_view *view)
6613 {
6614 	struct tog_tree_view_state *s = &view->state.tree;
6615 	struct got_tree_entry *te = NULL;
6616 
6617 	if (!view->searching) {
6618 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6619 		return NULL;
6620 	}
6621 
6622 	if (s->matched_entry) {
6623 		if (view->searching == TOG_SEARCH_FORWARD) {
6624 			if (s->selected_entry)
6625 				te = got_tree_entry_get_next(s->tree,
6626 				    s->selected_entry);
6627 			else
6628 				te = got_object_tree_get_first_entry(s->tree);
6629 		} else {
6630 			if (s->selected_entry == NULL)
6631 				te = got_object_tree_get_last_entry(s->tree);
6632 			else
6633 				te = got_tree_entry_get_prev(s->tree,
6634 				    s->selected_entry);
6635 		}
6636 	} else {
6637 		if (s->selected_entry)
6638 			te = s->selected_entry;
6639 		else if (view->searching == TOG_SEARCH_FORWARD)
6640 			te = got_object_tree_get_first_entry(s->tree);
6641 		else
6642 			te = got_object_tree_get_last_entry(s->tree);
6643 	}
6644 
6645 	while (1) {
6646 		if (te == NULL) {
6647 			if (s->matched_entry == NULL) {
6648 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6649 				return NULL;
6650 			}
6651 			if (view->searching == TOG_SEARCH_FORWARD)
6652 				te = got_object_tree_get_first_entry(s->tree);
6653 			else
6654 				te = got_object_tree_get_last_entry(s->tree);
6655 		}
6656 
6657 		if (match_tree_entry(te, &view->regex)) {
6658 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6659 			s->matched_entry = te;
6660 			break;
6661 		}
6662 
6663 		if (view->searching == TOG_SEARCH_FORWARD)
6664 			te = got_tree_entry_get_next(s->tree, te);
6665 		else
6666 			te = got_tree_entry_get_prev(s->tree, te);
6667 	}
6668 
6669 	if (s->matched_entry) {
6670 		s->first_displayed_entry = s->matched_entry;
6671 		s->selected = 0;
6672 	}
6673 
6674 	return NULL;
6675 }
6676 
6677 static const struct got_error *
6678 show_tree_view(struct tog_view *view)
6679 {
6680 	const struct got_error *err = NULL;
6681 	struct tog_tree_view_state *s = &view->state.tree;
6682 	char *parent_path;
6683 
6684 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6685 	if (err)
6686 		return err;
6687 
6688 	err = draw_tree_entries(view, parent_path);
6689 	free(parent_path);
6690 
6691 	view_border(view);
6692 	return err;
6693 }
6694 
6695 static const struct got_error *
6696 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6697 {
6698 	const struct got_error *err = NULL;
6699 	struct tog_tree_view_state *s = &view->state.tree;
6700 	struct tog_view *log_view, *ref_view;
6701 	struct got_tree_entry *te;
6702 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6703 
6704 	switch (ch) {
6705 	case 'i':
6706 		s->show_ids = !s->show_ids;
6707 		view->count = 0;
6708 		break;
6709 	case 'l':
6710 		view->count = 0;
6711 		if (!s->selected_entry)
6712 			break;
6713 		if (view_is_parent_view(view))
6714 			view_get_split(view, &begin_y, &begin_x);
6715 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6716 		if (view_is_parent_view(view) &&
6717 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6718 			err = view_init_hsplit(view, begin_y);
6719 			if (err)
6720 				break;
6721 		}
6722 		view->focussed = 0;
6723 		log_view->focussed = 1;
6724 		log_view->mode = view->mode;
6725 		log_view->nlines = view->lines - begin_y;
6726 		if (view_is_parent_view(view)) {
6727 			view_transfer_size(log_view, view);
6728 			err = view_close_child(view);
6729 			if (err)
6730 				return err;
6731 			err = view_set_child(view, log_view);
6732 			if (err)
6733 				return err;
6734 			view->focus_child = 1;
6735 		} else
6736 			*new_view = log_view;
6737 		break;
6738 	case 'r':
6739 		view->count = 0;
6740 		if (view_is_parent_view(view))
6741 			view_get_split(view, &begin_y, &begin_x);
6742 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6743 		if (ref_view == NULL)
6744 			return got_error_from_errno("view_open");
6745 		err = open_ref_view(ref_view, s->repo);
6746 		if (err) {
6747 			view_close(ref_view);
6748 			return err;
6749 		}
6750 		if (view_is_parent_view(view) &&
6751 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6752 			err = view_init_hsplit(view, begin_y);
6753 			if (err)
6754 				break;
6755 		}
6756 		view->focussed = 0;
6757 		ref_view->focussed = 1;
6758 		ref_view->mode = view->mode;
6759 		ref_view->nlines = view->lines - begin_y;
6760 		if (view_is_parent_view(view)) {
6761 			view_transfer_size(ref_view, view);
6762 			err = view_close_child(view);
6763 			if (err)
6764 				return err;
6765 			err = view_set_child(view, ref_view);
6766 			if (err)
6767 				return err;
6768 			view->focus_child = 1;
6769 		} else
6770 			*new_view = ref_view;
6771 		break;
6772 	case 'g':
6773 	case KEY_HOME:
6774 		s->selected = 0;
6775 		view->count = 0;
6776 		if (s->tree == s->root)
6777 			s->first_displayed_entry =
6778 			    got_object_tree_get_first_entry(s->tree);
6779 		else
6780 			s->first_displayed_entry = NULL;
6781 		break;
6782 	case 'G':
6783 	case KEY_END: {
6784 		int eos = view->nlines - 3;
6785 
6786 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6787 			--eos;  /* border */
6788 		s->selected = 0;
6789 		view->count = 0;
6790 		te = got_object_tree_get_last_entry(s->tree);
6791 		for (n = 0; n < eos; n++) {
6792 			if (te == NULL) {
6793 				if(s->tree != s->root) {
6794 					s->first_displayed_entry = NULL;
6795 					n++;
6796 				}
6797 				break;
6798 			}
6799 			s->first_displayed_entry = te;
6800 			te = got_tree_entry_get_prev(s->tree, te);
6801 		}
6802 		if (n > 0)
6803 			s->selected = n - 1;
6804 		break;
6805 	}
6806 	case 'k':
6807 	case KEY_UP:
6808 	case CTRL('p'):
6809 		if (s->selected > 0) {
6810 			s->selected--;
6811 			break;
6812 		}
6813 		tree_scroll_up(s, 1);
6814 		if (s->selected_entry == NULL ||
6815 		    (s->tree == s->root && s->selected_entry ==
6816 		     got_object_tree_get_first_entry(s->tree)))
6817 			view->count = 0;
6818 		break;
6819 	case CTRL('u'):
6820 	case 'u':
6821 		nscroll /= 2;
6822 		/* FALL THROUGH */
6823 	case KEY_PPAGE:
6824 	case CTRL('b'):
6825 	case 'b':
6826 		if (s->tree == s->root) {
6827 			if (got_object_tree_get_first_entry(s->tree) ==
6828 			    s->first_displayed_entry)
6829 				s->selected -= MIN(s->selected, nscroll);
6830 		} else {
6831 			if (s->first_displayed_entry == NULL)
6832 				s->selected -= MIN(s->selected, nscroll);
6833 		}
6834 		tree_scroll_up(s, MAX(0, nscroll));
6835 		if (s->selected_entry == NULL ||
6836 		    (s->tree == s->root && s->selected_entry ==
6837 		     got_object_tree_get_first_entry(s->tree)))
6838 			view->count = 0;
6839 		break;
6840 	case 'j':
6841 	case KEY_DOWN:
6842 	case CTRL('n'):
6843 		if (s->selected < s->ndisplayed - 1) {
6844 			s->selected++;
6845 			break;
6846 		}
6847 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6848 		    == NULL) {
6849 			/* can't scroll any further */
6850 			view->count = 0;
6851 			break;
6852 		}
6853 		tree_scroll_down(view, 1);
6854 		break;
6855 	case CTRL('d'):
6856 	case 'd':
6857 		nscroll /= 2;
6858 		/* FALL THROUGH */
6859 	case KEY_NPAGE:
6860 	case CTRL('f'):
6861 	case 'f':
6862 	case ' ':
6863 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6864 		    == NULL) {
6865 			/* can't scroll any further; move cursor down */
6866 			if (s->selected < s->ndisplayed - 1)
6867 				s->selected += MIN(nscroll,
6868 				    s->ndisplayed - s->selected - 1);
6869 			else
6870 				view->count = 0;
6871 			break;
6872 		}
6873 		tree_scroll_down(view, nscroll);
6874 		break;
6875 	case KEY_ENTER:
6876 	case '\r':
6877 	case KEY_BACKSPACE:
6878 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6879 			struct tog_parent_tree *parent;
6880 			/* user selected '..' */
6881 			if (s->tree == s->root) {
6882 				view->count = 0;
6883 				break;
6884 			}
6885 			parent = TAILQ_FIRST(&s->parents);
6886 			TAILQ_REMOVE(&s->parents, parent,
6887 			    entry);
6888 			got_object_tree_close(s->tree);
6889 			s->tree = parent->tree;
6890 			s->first_displayed_entry =
6891 			    parent->first_displayed_entry;
6892 			s->selected_entry =
6893 			    parent->selected_entry;
6894 			s->selected = parent->selected;
6895 			if (s->selected > view->nlines - 3) {
6896 				err = offset_selection_down(view);
6897 				if (err)
6898 					break;
6899 			}
6900 			free(parent);
6901 		} else if (S_ISDIR(got_tree_entry_get_mode(
6902 		    s->selected_entry))) {
6903 			struct got_tree_object *subtree;
6904 			view->count = 0;
6905 			err = got_object_open_as_tree(&subtree, s->repo,
6906 			    got_tree_entry_get_id(s->selected_entry));
6907 			if (err)
6908 				break;
6909 			err = tree_view_visit_subtree(s, subtree);
6910 			if (err) {
6911 				got_object_tree_close(subtree);
6912 				break;
6913 			}
6914 		} else if (S_ISREG(got_tree_entry_get_mode(
6915 		    s->selected_entry))) {
6916 			struct tog_view *blame_view;
6917 			int begin_x = 0, begin_y = 0;
6918 
6919 			if (view_is_parent_view(view))
6920 				view_get_split(view, &begin_y, &begin_x);
6921 
6922 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6923 			    s->selected_entry, &s->parents,
6924 			    s->commit_id, s->repo);
6925 			if (err)
6926 				break;
6927 
6928 			if (view_is_parent_view(view) &&
6929 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
6930 				err = view_init_hsplit(view, begin_y);
6931 				if (err)
6932 					break;
6933 			}
6934 
6935 			view->count = 0;
6936 			view->focussed = 0;
6937 			blame_view->focussed = 1;
6938 			blame_view->mode = view->mode;
6939 			blame_view->nlines = view->lines - begin_y;
6940 			if (view_is_parent_view(view)) {
6941 				view_transfer_size(blame_view, view);
6942 				err = view_close_child(view);
6943 				if (err)
6944 					return err;
6945 				err = view_set_child(view, blame_view);
6946 				if (err)
6947 					return err;
6948 				view->focus_child = 1;
6949 			} else
6950 				*new_view = blame_view;
6951 		}
6952 		break;
6953 	case KEY_RESIZE:
6954 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6955 			s->selected = view->nlines - 4;
6956 		view->count = 0;
6957 		break;
6958 	default:
6959 		view->count = 0;
6960 		break;
6961 	}
6962 
6963 	return err;
6964 }
6965 
6966 __dead static void
6967 usage_tree(void)
6968 {
6969 	endwin();
6970 	fprintf(stderr,
6971 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6972 	    getprogname());
6973 	exit(1);
6974 }
6975 
6976 static const struct got_error *
6977 cmd_tree(int argc, char *argv[])
6978 {
6979 	const struct got_error *error;
6980 	struct got_repository *repo = NULL;
6981 	struct got_worktree *worktree = NULL;
6982 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6983 	struct got_object_id *commit_id = NULL;
6984 	struct got_commit_object *commit = NULL;
6985 	const char *commit_id_arg = NULL;
6986 	char *label = NULL;
6987 	struct got_reference *ref = NULL;
6988 	const char *head_ref_name = NULL;
6989 	int ch;
6990 	struct tog_view *view;
6991 	int *pack_fds = NULL;
6992 
6993 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6994 		switch (ch) {
6995 		case 'c':
6996 			commit_id_arg = optarg;
6997 			break;
6998 		case 'r':
6999 			repo_path = realpath(optarg, NULL);
7000 			if (repo_path == NULL)
7001 				return got_error_from_errno2("realpath",
7002 				    optarg);
7003 			break;
7004 		default:
7005 			usage_tree();
7006 			/* NOTREACHED */
7007 		}
7008 	}
7009 
7010 	argc -= optind;
7011 	argv += optind;
7012 
7013 	if (argc > 1)
7014 		usage_tree();
7015 
7016 	error = got_repo_pack_fds_open(&pack_fds);
7017 	if (error != NULL)
7018 		goto done;
7019 
7020 	if (repo_path == NULL) {
7021 		cwd = getcwd(NULL, 0);
7022 		if (cwd == NULL)
7023 			return got_error_from_errno("getcwd");
7024 		error = got_worktree_open(&worktree, cwd);
7025 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7026 			goto done;
7027 		if (worktree)
7028 			repo_path =
7029 			    strdup(got_worktree_get_repo_path(worktree));
7030 		else
7031 			repo_path = strdup(cwd);
7032 		if (repo_path == NULL) {
7033 			error = got_error_from_errno("strdup");
7034 			goto done;
7035 		}
7036 	}
7037 
7038 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7039 	if (error != NULL)
7040 		goto done;
7041 
7042 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7043 	    repo, worktree);
7044 	if (error)
7045 		goto done;
7046 
7047 	init_curses();
7048 
7049 	error = apply_unveil(got_repo_get_path(repo), NULL);
7050 	if (error)
7051 		goto done;
7052 
7053 	error = tog_load_refs(repo, 0);
7054 	if (error)
7055 		goto done;
7056 
7057 	if (commit_id_arg == NULL) {
7058 		error = got_repo_match_object_id(&commit_id, &label,
7059 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7060 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7061 		if (error)
7062 			goto done;
7063 		head_ref_name = label;
7064 	} else {
7065 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7066 		if (error == NULL)
7067 			head_ref_name = got_ref_get_name(ref);
7068 		else if (error->code != GOT_ERR_NOT_REF)
7069 			goto done;
7070 		error = got_repo_match_object_id(&commit_id, NULL,
7071 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7072 		if (error)
7073 			goto done;
7074 	}
7075 
7076 	error = got_object_open_as_commit(&commit, repo, commit_id);
7077 	if (error)
7078 		goto done;
7079 
7080 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7081 	if (view == NULL) {
7082 		error = got_error_from_errno("view_open");
7083 		goto done;
7084 	}
7085 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7086 	if (error)
7087 		goto done;
7088 	if (!got_path_is_root_dir(in_repo_path)) {
7089 		error = tree_view_walk_path(&view->state.tree, commit,
7090 		    in_repo_path);
7091 		if (error)
7092 			goto done;
7093 	}
7094 
7095 	if (worktree) {
7096 		/* Release work tree lock. */
7097 		got_worktree_close(worktree);
7098 		worktree = NULL;
7099 	}
7100 	error = view_loop(view);
7101 done:
7102 	free(repo_path);
7103 	free(cwd);
7104 	free(commit_id);
7105 	free(label);
7106 	if (ref)
7107 		got_ref_close(ref);
7108 	if (repo) {
7109 		const struct got_error *close_err = got_repo_close(repo);
7110 		if (error == NULL)
7111 			error = close_err;
7112 	}
7113 	if (pack_fds) {
7114 		const struct got_error *pack_err =
7115 		    got_repo_pack_fds_close(pack_fds);
7116 		if (error == NULL)
7117 			error = pack_err;
7118 	}
7119 	tog_free_refs();
7120 	return error;
7121 }
7122 
7123 static const struct got_error *
7124 ref_view_load_refs(struct tog_ref_view_state *s)
7125 {
7126 	struct got_reflist_entry *sre;
7127 	struct tog_reflist_entry *re;
7128 
7129 	s->nrefs = 0;
7130 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7131 		if (strncmp(got_ref_get_name(sre->ref),
7132 		    "refs/got/", 9) == 0 &&
7133 		    strncmp(got_ref_get_name(sre->ref),
7134 		    "refs/got/backup/", 16) != 0)
7135 			continue;
7136 
7137 		re = malloc(sizeof(*re));
7138 		if (re == NULL)
7139 			return got_error_from_errno("malloc");
7140 
7141 		re->ref = got_ref_dup(sre->ref);
7142 		if (re->ref == NULL)
7143 			return got_error_from_errno("got_ref_dup");
7144 		re->idx = s->nrefs++;
7145 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7146 	}
7147 
7148 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7149 	return NULL;
7150 }
7151 
7152 static void
7153 ref_view_free_refs(struct tog_ref_view_state *s)
7154 {
7155 	struct tog_reflist_entry *re;
7156 
7157 	while (!TAILQ_EMPTY(&s->refs)) {
7158 		re = TAILQ_FIRST(&s->refs);
7159 		TAILQ_REMOVE(&s->refs, re, entry);
7160 		got_ref_close(re->ref);
7161 		free(re);
7162 	}
7163 }
7164 
7165 static const struct got_error *
7166 open_ref_view(struct tog_view *view, struct got_repository *repo)
7167 {
7168 	const struct got_error *err = NULL;
7169 	struct tog_ref_view_state *s = &view->state.ref;
7170 
7171 	s->selected_entry = 0;
7172 	s->repo = repo;
7173 
7174 	TAILQ_INIT(&s->refs);
7175 	STAILQ_INIT(&s->colors);
7176 
7177 	err = ref_view_load_refs(s);
7178 	if (err)
7179 		return err;
7180 
7181 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7182 		err = add_color(&s->colors, "^refs/heads/",
7183 		    TOG_COLOR_REFS_HEADS,
7184 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7185 		if (err)
7186 			goto done;
7187 
7188 		err = add_color(&s->colors, "^refs/tags/",
7189 		    TOG_COLOR_REFS_TAGS,
7190 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7191 		if (err)
7192 			goto done;
7193 
7194 		err = add_color(&s->colors, "^refs/remotes/",
7195 		    TOG_COLOR_REFS_REMOTES,
7196 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7197 		if (err)
7198 			goto done;
7199 
7200 		err = add_color(&s->colors, "^refs/got/backup/",
7201 		    TOG_COLOR_REFS_BACKUP,
7202 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7203 		if (err)
7204 			goto done;
7205 	}
7206 
7207 	view->show = show_ref_view;
7208 	view->input = input_ref_view;
7209 	view->close = close_ref_view;
7210 	view->search_start = search_start_ref_view;
7211 	view->search_next = search_next_ref_view;
7212 done:
7213 	if (err)
7214 		free_colors(&s->colors);
7215 	return err;
7216 }
7217 
7218 static const struct got_error *
7219 close_ref_view(struct tog_view *view)
7220 {
7221 	struct tog_ref_view_state *s = &view->state.ref;
7222 
7223 	ref_view_free_refs(s);
7224 	free_colors(&s->colors);
7225 
7226 	return NULL;
7227 }
7228 
7229 static const struct got_error *
7230 resolve_reflist_entry(struct got_object_id **commit_id,
7231     struct tog_reflist_entry *re, struct got_repository *repo)
7232 {
7233 	const struct got_error *err = NULL;
7234 	struct got_object_id *obj_id;
7235 	struct got_tag_object *tag = NULL;
7236 	int obj_type;
7237 
7238 	*commit_id = NULL;
7239 
7240 	err = got_ref_resolve(&obj_id, repo, re->ref);
7241 	if (err)
7242 		return err;
7243 
7244 	err = got_object_get_type(&obj_type, repo, obj_id);
7245 	if (err)
7246 		goto done;
7247 
7248 	switch (obj_type) {
7249 	case GOT_OBJ_TYPE_COMMIT:
7250 		*commit_id = obj_id;
7251 		break;
7252 	case GOT_OBJ_TYPE_TAG:
7253 		err = got_object_open_as_tag(&tag, repo, obj_id);
7254 		if (err)
7255 			goto done;
7256 		free(obj_id);
7257 		err = got_object_get_type(&obj_type, repo,
7258 		    got_object_tag_get_object_id(tag));
7259 		if (err)
7260 			goto done;
7261 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7262 			err = got_error(GOT_ERR_OBJ_TYPE);
7263 			goto done;
7264 		}
7265 		*commit_id = got_object_id_dup(
7266 		    got_object_tag_get_object_id(tag));
7267 		if (*commit_id == NULL) {
7268 			err = got_error_from_errno("got_object_id_dup");
7269 			goto done;
7270 		}
7271 		break;
7272 	default:
7273 		err = got_error(GOT_ERR_OBJ_TYPE);
7274 		break;
7275 	}
7276 
7277 done:
7278 	if (tag)
7279 		got_object_tag_close(tag);
7280 	if (err) {
7281 		free(*commit_id);
7282 		*commit_id = NULL;
7283 	}
7284 	return err;
7285 }
7286 
7287 static const struct got_error *
7288 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7289     struct tog_reflist_entry *re, struct got_repository *repo)
7290 {
7291 	struct tog_view *log_view;
7292 	const struct got_error *err = NULL;
7293 	struct got_object_id *commit_id = NULL;
7294 
7295 	*new_view = NULL;
7296 
7297 	err = resolve_reflist_entry(&commit_id, re, repo);
7298 	if (err) {
7299 		if (err->code != GOT_ERR_OBJ_TYPE)
7300 			return err;
7301 		else
7302 			return NULL;
7303 	}
7304 
7305 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7306 	if (log_view == NULL) {
7307 		err = got_error_from_errno("view_open");
7308 		goto done;
7309 	}
7310 
7311 	err = open_log_view(log_view, commit_id, repo,
7312 	    got_ref_get_name(re->ref), "", 0);
7313 done:
7314 	if (err)
7315 		view_close(log_view);
7316 	else
7317 		*new_view = log_view;
7318 	free(commit_id);
7319 	return err;
7320 }
7321 
7322 static void
7323 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7324 {
7325 	struct tog_reflist_entry *re;
7326 	int i = 0;
7327 
7328 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7329 		return;
7330 
7331 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7332 	while (i++ < maxscroll) {
7333 		if (re == NULL)
7334 			break;
7335 		s->first_displayed_entry = re;
7336 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7337 	}
7338 }
7339 
7340 static const struct got_error *
7341 ref_scroll_down(struct tog_view *view, int maxscroll)
7342 {
7343 	struct tog_ref_view_state *s = &view->state.ref;
7344 	struct tog_reflist_entry *next, *last;
7345 	int n = 0;
7346 
7347 	if (s->first_displayed_entry)
7348 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7349 	else
7350 		next = TAILQ_FIRST(&s->refs);
7351 
7352 	last = s->last_displayed_entry;
7353 	while (next && n++ < maxscroll) {
7354 		if (last)
7355 			last = TAILQ_NEXT(last, entry);
7356 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7357 			s->first_displayed_entry = next;
7358 			next = TAILQ_NEXT(next, entry);
7359 		}
7360 	}
7361 
7362 	return NULL;
7363 }
7364 
7365 static const struct got_error *
7366 search_start_ref_view(struct tog_view *view)
7367 {
7368 	struct tog_ref_view_state *s = &view->state.ref;
7369 
7370 	s->matched_entry = NULL;
7371 	return NULL;
7372 }
7373 
7374 static int
7375 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7376 {
7377 	regmatch_t regmatch;
7378 
7379 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7380 	    0) == 0;
7381 }
7382 
7383 static const struct got_error *
7384 search_next_ref_view(struct tog_view *view)
7385 {
7386 	struct tog_ref_view_state *s = &view->state.ref;
7387 	struct tog_reflist_entry *re = NULL;
7388 
7389 	if (!view->searching) {
7390 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7391 		return NULL;
7392 	}
7393 
7394 	if (s->matched_entry) {
7395 		if (view->searching == TOG_SEARCH_FORWARD) {
7396 			if (s->selected_entry)
7397 				re = TAILQ_NEXT(s->selected_entry, entry);
7398 			else
7399 				re = TAILQ_PREV(s->selected_entry,
7400 				    tog_reflist_head, entry);
7401 		} else {
7402 			if (s->selected_entry == NULL)
7403 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7404 			else
7405 				re = TAILQ_PREV(s->selected_entry,
7406 				    tog_reflist_head, entry);
7407 		}
7408 	} else {
7409 		if (s->selected_entry)
7410 			re = s->selected_entry;
7411 		else if (view->searching == TOG_SEARCH_FORWARD)
7412 			re = TAILQ_FIRST(&s->refs);
7413 		else
7414 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7415 	}
7416 
7417 	while (1) {
7418 		if (re == NULL) {
7419 			if (s->matched_entry == NULL) {
7420 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7421 				return NULL;
7422 			}
7423 			if (view->searching == TOG_SEARCH_FORWARD)
7424 				re = TAILQ_FIRST(&s->refs);
7425 			else
7426 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7427 		}
7428 
7429 		if (match_reflist_entry(re, &view->regex)) {
7430 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7431 			s->matched_entry = re;
7432 			break;
7433 		}
7434 
7435 		if (view->searching == TOG_SEARCH_FORWARD)
7436 			re = TAILQ_NEXT(re, entry);
7437 		else
7438 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7439 	}
7440 
7441 	if (s->matched_entry) {
7442 		s->first_displayed_entry = s->matched_entry;
7443 		s->selected = 0;
7444 	}
7445 
7446 	return NULL;
7447 }
7448 
7449 static const struct got_error *
7450 show_ref_view(struct tog_view *view)
7451 {
7452 	const struct got_error *err = NULL;
7453 	struct tog_ref_view_state *s = &view->state.ref;
7454 	struct tog_reflist_entry *re;
7455 	char *line = NULL;
7456 	wchar_t *wline;
7457 	struct tog_color *tc;
7458 	int width, n;
7459 	int limit = view->nlines;
7460 
7461 	werase(view->window);
7462 
7463 	s->ndisplayed = 0;
7464 	if (view_is_hsplit_top(view))
7465 		--limit;  /* border */
7466 
7467 	if (limit == 0)
7468 		return NULL;
7469 
7470 	re = s->first_displayed_entry;
7471 
7472 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7473 	    s->nrefs) == -1)
7474 		return got_error_from_errno("asprintf");
7475 
7476 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7477 	if (err) {
7478 		free(line);
7479 		return err;
7480 	}
7481 	if (view_needs_focus_indication(view))
7482 		wstandout(view->window);
7483 	waddwstr(view->window, wline);
7484 	if (view_needs_focus_indication(view))
7485 		wstandend(view->window);
7486 	free(wline);
7487 	wline = NULL;
7488 	free(line);
7489 	line = NULL;
7490 	if (width < view->ncols - 1)
7491 		waddch(view->window, '\n');
7492 	if (--limit <= 0)
7493 		return NULL;
7494 
7495 	n = 0;
7496 	while (re && limit > 0) {
7497 		char *line = NULL;
7498 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7499 
7500 		if (s->show_date) {
7501 			struct got_commit_object *ci;
7502 			struct got_tag_object *tag;
7503 			struct got_object_id *id;
7504 			struct tm tm;
7505 			time_t t;
7506 
7507 			err = got_ref_resolve(&id, s->repo, re->ref);
7508 			if (err)
7509 				return err;
7510 			err = got_object_open_as_tag(&tag, s->repo, id);
7511 			if (err) {
7512 				if (err->code != GOT_ERR_OBJ_TYPE) {
7513 					free(id);
7514 					return err;
7515 				}
7516 				err = got_object_open_as_commit(&ci, s->repo,
7517 				    id);
7518 				if (err) {
7519 					free(id);
7520 					return err;
7521 				}
7522 				t = got_object_commit_get_committer_time(ci);
7523 				got_object_commit_close(ci);
7524 			} else {
7525 				t = got_object_tag_get_tagger_time(tag);
7526 				got_object_tag_close(tag);
7527 			}
7528 			free(id);
7529 			if (gmtime_r(&t, &tm) == NULL)
7530 				return got_error_from_errno("gmtime_r");
7531 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7532 				return got_error(GOT_ERR_NO_SPACE);
7533 		}
7534 		if (got_ref_is_symbolic(re->ref)) {
7535 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7536 			    ymd : "", got_ref_get_name(re->ref),
7537 			    got_ref_get_symref_target(re->ref)) == -1)
7538 				return got_error_from_errno("asprintf");
7539 		} else if (s->show_ids) {
7540 			struct got_object_id *id;
7541 			char *id_str;
7542 			err = got_ref_resolve(&id, s->repo, re->ref);
7543 			if (err)
7544 				return err;
7545 			err = got_object_id_str(&id_str, id);
7546 			if (err) {
7547 				free(id);
7548 				return err;
7549 			}
7550 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7551 			    got_ref_get_name(re->ref), id_str) == -1) {
7552 				err = got_error_from_errno("asprintf");
7553 				free(id);
7554 				free(id_str);
7555 				return err;
7556 			}
7557 			free(id);
7558 			free(id_str);
7559 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7560 		    got_ref_get_name(re->ref)) == -1)
7561 			return got_error_from_errno("asprintf");
7562 
7563 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7564 		    0, 0);
7565 		if (err) {
7566 			free(line);
7567 			return err;
7568 		}
7569 		if (n == s->selected) {
7570 			if (view->focussed)
7571 				wstandout(view->window);
7572 			s->selected_entry = re;
7573 		}
7574 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7575 		if (tc)
7576 			wattr_on(view->window,
7577 			    COLOR_PAIR(tc->colorpair), NULL);
7578 		waddwstr(view->window, wline);
7579 		if (tc)
7580 			wattr_off(view->window,
7581 			    COLOR_PAIR(tc->colorpair), NULL);
7582 		if (width < view->ncols - 1)
7583 			waddch(view->window, '\n');
7584 		if (n == s->selected && view->focussed)
7585 			wstandend(view->window);
7586 		free(line);
7587 		free(wline);
7588 		wline = NULL;
7589 		n++;
7590 		s->ndisplayed++;
7591 		s->last_displayed_entry = re;
7592 
7593 		limit--;
7594 		re = TAILQ_NEXT(re, entry);
7595 	}
7596 
7597 	view_border(view);
7598 	return err;
7599 }
7600 
7601 static const struct got_error *
7602 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7603     struct tog_reflist_entry *re, struct got_repository *repo)
7604 {
7605 	const struct got_error *err = NULL;
7606 	struct got_object_id *commit_id = NULL;
7607 	struct tog_view *tree_view;
7608 
7609 	*new_view = NULL;
7610 
7611 	err = resolve_reflist_entry(&commit_id, re, repo);
7612 	if (err) {
7613 		if (err->code != GOT_ERR_OBJ_TYPE)
7614 			return err;
7615 		else
7616 			return NULL;
7617 	}
7618 
7619 
7620 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7621 	if (tree_view == NULL) {
7622 		err = got_error_from_errno("view_open");
7623 		goto done;
7624 	}
7625 
7626 	err = open_tree_view(tree_view, commit_id,
7627 	    got_ref_get_name(re->ref), repo);
7628 	if (err)
7629 		goto done;
7630 
7631 	*new_view = tree_view;
7632 done:
7633 	free(commit_id);
7634 	return err;
7635 }
7636 static const struct got_error *
7637 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7638 {
7639 	const struct got_error *err = NULL;
7640 	struct tog_ref_view_state *s = &view->state.ref;
7641 	struct tog_view *log_view, *tree_view;
7642 	struct tog_reflist_entry *re;
7643 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7644 
7645 	switch (ch) {
7646 	case 'i':
7647 		s->show_ids = !s->show_ids;
7648 		view->count = 0;
7649 		break;
7650 	case 'm':
7651 		s->show_date = !s->show_date;
7652 		view->count = 0;
7653 		break;
7654 	case 'o':
7655 		s->sort_by_date = !s->sort_by_date;
7656 		view->count = 0;
7657 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7658 		    got_ref_cmp_by_commit_timestamp_descending :
7659 		    tog_ref_cmp_by_name, s->repo);
7660 		if (err)
7661 			break;
7662 		got_reflist_object_id_map_free(tog_refs_idmap);
7663 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7664 		    &tog_refs, s->repo);
7665 		if (err)
7666 			break;
7667 		ref_view_free_refs(s);
7668 		err = ref_view_load_refs(s);
7669 		break;
7670 	case KEY_ENTER:
7671 	case '\r':
7672 		view->count = 0;
7673 		if (!s->selected_entry)
7674 			break;
7675 		if (view_is_parent_view(view))
7676 			view_get_split(view, &begin_y, &begin_x);
7677 
7678 		err = log_ref_entry(&log_view, begin_y, begin_x,
7679 		    s->selected_entry, s->repo);
7680 		if (err)
7681 			break;
7682 
7683 		if (view_is_parent_view(view) &&
7684 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7685 			err = view_init_hsplit(view, begin_y);
7686 			if (err)
7687 				break;
7688 		}
7689 
7690 		view->focussed = 0;
7691 		log_view->focussed = 1;
7692 		log_view->mode = view->mode;
7693 		log_view->nlines = view->lines - begin_y;
7694 		if (view_is_parent_view(view)) {
7695 			view_transfer_size(log_view, view);
7696 			err = view_close_child(view);
7697 			if (err)
7698 				return err;
7699 			err = view_set_child(view, log_view);
7700 			if (err)
7701 				return err;
7702 			view->focus_child = 1;
7703 		} else
7704 			*new_view = log_view;
7705 		break;
7706 	case 't':
7707 		view->count = 0;
7708 		if (!s->selected_entry)
7709 			break;
7710 		if (view_is_parent_view(view))
7711 			view_get_split(view, &begin_y, &begin_x);
7712 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7713 		    s->selected_entry, s->repo);
7714 		if (err || tree_view == NULL)
7715 			break;
7716 		if (view_is_parent_view(view) &&
7717 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7718 			err = view_init_hsplit(view, begin_y);
7719 			if (err)
7720 				break;
7721 		}
7722 		view->focussed = 0;
7723 		tree_view->focussed = 1;
7724 		tree_view->mode = view->mode;
7725 		tree_view->nlines = view->lines - begin_y;
7726 		if (view_is_parent_view(view)) {
7727 			view_transfer_size(tree_view, view);
7728 			err = view_close_child(view);
7729 			if (err)
7730 				return err;
7731 			err = view_set_child(view, tree_view);
7732 			if (err)
7733 				return err;
7734 			view->focus_child = 1;
7735 		} else
7736 			*new_view = tree_view;
7737 		break;
7738 	case 'g':
7739 	case KEY_HOME:
7740 		s->selected = 0;
7741 		view->count = 0;
7742 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7743 		break;
7744 	case 'G':
7745 	case KEY_END: {
7746 		int eos = view->nlines - 1;
7747 
7748 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7749 			--eos;  /* border */
7750 		s->selected = 0;
7751 		view->count = 0;
7752 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7753 		for (n = 0; n < eos; n++) {
7754 			if (re == NULL)
7755 				break;
7756 			s->first_displayed_entry = re;
7757 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7758 		}
7759 		if (n > 0)
7760 			s->selected = n - 1;
7761 		break;
7762 	}
7763 	case 'k':
7764 	case KEY_UP:
7765 	case CTRL('p'):
7766 		if (s->selected > 0) {
7767 			s->selected--;
7768 			break;
7769 		}
7770 		ref_scroll_up(s, 1);
7771 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7772 			view->count = 0;
7773 		break;
7774 	case CTRL('u'):
7775 	case 'u':
7776 		nscroll /= 2;
7777 		/* FALL THROUGH */
7778 	case KEY_PPAGE:
7779 	case CTRL('b'):
7780 	case 'b':
7781 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7782 			s->selected -= MIN(nscroll, s->selected);
7783 		ref_scroll_up(s, MAX(0, nscroll));
7784 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7785 			view->count = 0;
7786 		break;
7787 	case 'j':
7788 	case KEY_DOWN:
7789 	case CTRL('n'):
7790 		if (s->selected < s->ndisplayed - 1) {
7791 			s->selected++;
7792 			break;
7793 		}
7794 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7795 			/* can't scroll any further */
7796 			view->count = 0;
7797 			break;
7798 		}
7799 		ref_scroll_down(view, 1);
7800 		break;
7801 	case CTRL('d'):
7802 	case 'd':
7803 		nscroll /= 2;
7804 		/* FALL THROUGH */
7805 	case KEY_NPAGE:
7806 	case CTRL('f'):
7807 	case 'f':
7808 	case ' ':
7809 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7810 			/* can't scroll any further; move cursor down */
7811 			if (s->selected < s->ndisplayed - 1)
7812 				s->selected += MIN(nscroll,
7813 				    s->ndisplayed - s->selected - 1);
7814 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7815 				s->selected += s->ndisplayed - s->selected - 1;
7816 			view->count = 0;
7817 			break;
7818 		}
7819 		ref_scroll_down(view, nscroll);
7820 		break;
7821 	case CTRL('l'):
7822 		view->count = 0;
7823 		tog_free_refs();
7824 		err = tog_load_refs(s->repo, s->sort_by_date);
7825 		if (err)
7826 			break;
7827 		ref_view_free_refs(s);
7828 		err = ref_view_load_refs(s);
7829 		break;
7830 	case KEY_RESIZE:
7831 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7832 			s->selected = view->nlines - 2;
7833 		break;
7834 	default:
7835 		view->count = 0;
7836 		break;
7837 	}
7838 
7839 	return err;
7840 }
7841 
7842 __dead static void
7843 usage_ref(void)
7844 {
7845 	endwin();
7846 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7847 	    getprogname());
7848 	exit(1);
7849 }
7850 
7851 static const struct got_error *
7852 cmd_ref(int argc, char *argv[])
7853 {
7854 	const struct got_error *error;
7855 	struct got_repository *repo = NULL;
7856 	struct got_worktree *worktree = NULL;
7857 	char *cwd = NULL, *repo_path = NULL;
7858 	int ch;
7859 	struct tog_view *view;
7860 	int *pack_fds = NULL;
7861 
7862 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7863 		switch (ch) {
7864 		case 'r':
7865 			repo_path = realpath(optarg, NULL);
7866 			if (repo_path == NULL)
7867 				return got_error_from_errno2("realpath",
7868 				    optarg);
7869 			break;
7870 		default:
7871 			usage_ref();
7872 			/* NOTREACHED */
7873 		}
7874 	}
7875 
7876 	argc -= optind;
7877 	argv += optind;
7878 
7879 	if (argc > 1)
7880 		usage_ref();
7881 
7882 	error = got_repo_pack_fds_open(&pack_fds);
7883 	if (error != NULL)
7884 		goto done;
7885 
7886 	if (repo_path == NULL) {
7887 		cwd = getcwd(NULL, 0);
7888 		if (cwd == NULL)
7889 			return got_error_from_errno("getcwd");
7890 		error = got_worktree_open(&worktree, cwd);
7891 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7892 			goto done;
7893 		if (worktree)
7894 			repo_path =
7895 			    strdup(got_worktree_get_repo_path(worktree));
7896 		else
7897 			repo_path = strdup(cwd);
7898 		if (repo_path == NULL) {
7899 			error = got_error_from_errno("strdup");
7900 			goto done;
7901 		}
7902 	}
7903 
7904 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7905 	if (error != NULL)
7906 		goto done;
7907 
7908 	init_curses();
7909 
7910 	error = apply_unveil(got_repo_get_path(repo), NULL);
7911 	if (error)
7912 		goto done;
7913 
7914 	error = tog_load_refs(repo, 0);
7915 	if (error)
7916 		goto done;
7917 
7918 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7919 	if (view == NULL) {
7920 		error = got_error_from_errno("view_open");
7921 		goto done;
7922 	}
7923 
7924 	error = open_ref_view(view, repo);
7925 	if (error)
7926 		goto done;
7927 
7928 	if (worktree) {
7929 		/* Release work tree lock. */
7930 		got_worktree_close(worktree);
7931 		worktree = NULL;
7932 	}
7933 	error = view_loop(view);
7934 done:
7935 	free(repo_path);
7936 	free(cwd);
7937 	if (repo) {
7938 		const struct got_error *close_err = got_repo_close(repo);
7939 		if (close_err)
7940 			error = close_err;
7941 	}
7942 	if (pack_fds) {
7943 		const struct got_error *pack_err =
7944 		    got_repo_pack_fds_close(pack_fds);
7945 		if (error == NULL)
7946 			error = pack_err;
7947 	}
7948 	tog_free_refs();
7949 	return error;
7950 }
7951 
7952 /*
7953  * If view was scrolled down to move the selected line into view when opening a
7954  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7955  */
7956 static void
7957 offset_selection_up(struct tog_view *view)
7958 {
7959 	switch (view->type) {
7960 	case TOG_VIEW_BLAME: {
7961 		struct tog_blame_view_state *s = &view->state.blame;
7962 		if (s->first_displayed_line == 1) {
7963 			s->selected_line = MAX(s->selected_line - view->offset,
7964 			    1);
7965 			break;
7966 		}
7967 		if (s->first_displayed_line > view->offset)
7968 			s->first_displayed_line -= view->offset;
7969 		else
7970 			s->first_displayed_line = 1;
7971 		s->selected_line += view->offset;
7972 		break;
7973 	}
7974 	case TOG_VIEW_LOG:
7975 		log_scroll_up(&view->state.log, view->offset);
7976 		view->state.log.selected += view->offset;
7977 		break;
7978 	case TOG_VIEW_REF:
7979 		ref_scroll_up(&view->state.ref, view->offset);
7980 		view->state.ref.selected += view->offset;
7981 		break;
7982 	case TOG_VIEW_TREE:
7983 		tree_scroll_up(&view->state.tree, view->offset);
7984 		view->state.tree.selected += view->offset;
7985 		break;
7986 	default:
7987 		break;
7988 	}
7989 
7990 	view->offset = 0;
7991 }
7992 
7993 /*
7994  * If the selected line is in the section of screen covered by the bottom split,
7995  * scroll down offset lines to move it into view and index its new position.
7996  */
7997 static const struct got_error *
7998 offset_selection_down(struct tog_view *view)
7999 {
8000 	const struct got_error	*err = NULL;
8001 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8002 	int			*selected = NULL;
8003 	int			 header, offset;
8004 
8005 	switch (view->type) {
8006 	case TOG_VIEW_BLAME: {
8007 		struct tog_blame_view_state *s = &view->state.blame;
8008 		header = 3;
8009 		scrolld = NULL;
8010 		if (s->selected_line > view->nlines - header) {
8011 			offset = abs(view->nlines - s->selected_line - header);
8012 			s->first_displayed_line += offset;
8013 			s->selected_line -= offset;
8014 			view->offset = offset;
8015 		}
8016 		break;
8017 	}
8018 	case TOG_VIEW_LOG: {
8019 		struct tog_log_view_state *s = &view->state.log;
8020 		scrolld = &log_scroll_down;
8021 		header = view_is_parent_view(view) ? 3 : 2;
8022 		selected = &s->selected;
8023 		break;
8024 	}
8025 	case TOG_VIEW_REF: {
8026 		struct tog_ref_view_state *s = &view->state.ref;
8027 		scrolld = &ref_scroll_down;
8028 		header = 3;
8029 		selected = &s->selected;
8030 		break;
8031 	}
8032 	case TOG_VIEW_TREE: {
8033 		struct tog_tree_view_state *s = &view->state.tree;
8034 		scrolld = &tree_scroll_down;
8035 		header = 5;
8036 		selected = &s->selected;
8037 		break;
8038 	}
8039 	default:
8040 		selected = NULL;
8041 		scrolld = NULL;
8042 		header = 0;
8043 		break;
8044 	}
8045 
8046 	if (selected && *selected > view->nlines - header) {
8047 		offset = abs(view->nlines - *selected - header);
8048 		view->offset = offset;
8049 		if (scrolld && offset) {
8050 			err = scrolld(view, offset);
8051 			*selected -= offset;
8052 		}
8053 	}
8054 
8055 	return err;
8056 }
8057 
8058 static void
8059 list_commands(FILE *fp)
8060 {
8061 	size_t i;
8062 
8063 	fprintf(fp, "commands:");
8064 	for (i = 0; i < nitems(tog_commands); i++) {
8065 		const struct tog_cmd *cmd = &tog_commands[i];
8066 		fprintf(fp, " %s", cmd->name);
8067 	}
8068 	fputc('\n', fp);
8069 }
8070 
8071 __dead static void
8072 usage(int hflag, int status)
8073 {
8074 	FILE *fp = (status == 0) ? stdout : stderr;
8075 
8076 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8077 	    getprogname());
8078 	if (hflag) {
8079 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8080 		list_commands(fp);
8081 	}
8082 	exit(status);
8083 }
8084 
8085 static char **
8086 make_argv(int argc, ...)
8087 {
8088 	va_list ap;
8089 	char **argv;
8090 	int i;
8091 
8092 	va_start(ap, argc);
8093 
8094 	argv = calloc(argc, sizeof(char *));
8095 	if (argv == NULL)
8096 		err(1, "calloc");
8097 	for (i = 0; i < argc; i++) {
8098 		argv[i] = strdup(va_arg(ap, char *));
8099 		if (argv[i] == NULL)
8100 			err(1, "strdup");
8101 	}
8102 
8103 	va_end(ap);
8104 	return argv;
8105 }
8106 
8107 /*
8108  * Try to convert 'tog path' into a 'tog log path' command.
8109  * The user could simply have mistyped the command rather than knowingly
8110  * provided a path. So check whether argv[0] can in fact be resolved
8111  * to a path in the HEAD commit and print a special error if not.
8112  * This hack is for mpi@ <3
8113  */
8114 static const struct got_error *
8115 tog_log_with_path(int argc, char *argv[])
8116 {
8117 	const struct got_error *error = NULL, *close_err;
8118 	const struct tog_cmd *cmd = NULL;
8119 	struct got_repository *repo = NULL;
8120 	struct got_worktree *worktree = NULL;
8121 	struct got_object_id *commit_id = NULL, *id = NULL;
8122 	struct got_commit_object *commit = NULL;
8123 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8124 	char *commit_id_str = NULL, **cmd_argv = NULL;
8125 	int *pack_fds = NULL;
8126 
8127 	cwd = getcwd(NULL, 0);
8128 	if (cwd == NULL)
8129 		return got_error_from_errno("getcwd");
8130 
8131 	error = got_repo_pack_fds_open(&pack_fds);
8132 	if (error != NULL)
8133 		goto done;
8134 
8135 	error = got_worktree_open(&worktree, cwd);
8136 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8137 		goto done;
8138 
8139 	if (worktree)
8140 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8141 	else
8142 		repo_path = strdup(cwd);
8143 	if (repo_path == NULL) {
8144 		error = got_error_from_errno("strdup");
8145 		goto done;
8146 	}
8147 
8148 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8149 	if (error != NULL)
8150 		goto done;
8151 
8152 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8153 	    repo, worktree);
8154 	if (error)
8155 		goto done;
8156 
8157 	error = tog_load_refs(repo, 0);
8158 	if (error)
8159 		goto done;
8160 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8161 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8162 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8163 	if (error)
8164 		goto done;
8165 
8166 	if (worktree) {
8167 		got_worktree_close(worktree);
8168 		worktree = NULL;
8169 	}
8170 
8171 	error = got_object_open_as_commit(&commit, repo, commit_id);
8172 	if (error)
8173 		goto done;
8174 
8175 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8176 	if (error) {
8177 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8178 			goto done;
8179 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8180 		    getprogname(), argv[0]);
8181 		usage(1, 1);
8182 		/* not reached */
8183 	}
8184 
8185 	close_err = got_repo_close(repo);
8186 	if (error == NULL)
8187 		error = close_err;
8188 	repo = NULL;
8189 
8190 	error = got_object_id_str(&commit_id_str, commit_id);
8191 	if (error)
8192 		goto done;
8193 
8194 	cmd = &tog_commands[0]; /* log */
8195 	argc = 4;
8196 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8197 	error = cmd->cmd_main(argc, cmd_argv);
8198 done:
8199 	if (repo) {
8200 		close_err = got_repo_close(repo);
8201 		if (error == NULL)
8202 			error = close_err;
8203 	}
8204 	if (commit)
8205 		got_object_commit_close(commit);
8206 	if (worktree)
8207 		got_worktree_close(worktree);
8208 	if (pack_fds) {
8209 		const struct got_error *pack_err =
8210 		    got_repo_pack_fds_close(pack_fds);
8211 		if (error == NULL)
8212 			error = pack_err;
8213 	}
8214 	free(id);
8215 	free(commit_id_str);
8216 	free(commit_id);
8217 	free(cwd);
8218 	free(repo_path);
8219 	free(in_repo_path);
8220 	if (cmd_argv) {
8221 		int i;
8222 		for (i = 0; i < argc; i++)
8223 			free(cmd_argv[i]);
8224 		free(cmd_argv);
8225 	}
8226 	tog_free_refs();
8227 	return error;
8228 }
8229 
8230 int
8231 main(int argc, char *argv[])
8232 {
8233 	const struct got_error *error = NULL;
8234 	const struct tog_cmd *cmd = NULL;
8235 	int ch, hflag = 0, Vflag = 0;
8236 	char **cmd_argv = NULL;
8237 	static const struct option longopts[] = {
8238 	    { "version", no_argument, NULL, 'V' },
8239 	    { NULL, 0, NULL, 0}
8240 	};
8241 	char *diff_algo_str = NULL;
8242 
8243 	setlocale(LC_CTYPE, "");
8244 
8245 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8246 		switch (ch) {
8247 		case 'h':
8248 			hflag = 1;
8249 			break;
8250 		case 'V':
8251 			Vflag = 1;
8252 			break;
8253 		default:
8254 			usage(hflag, 1);
8255 			/* NOTREACHED */
8256 		}
8257 	}
8258 
8259 	argc -= optind;
8260 	argv += optind;
8261 	optind = 1;
8262 	optreset = 1;
8263 
8264 	if (Vflag) {
8265 		got_version_print_str();
8266 		return 0;
8267 	}
8268 
8269 #ifndef PROFILE
8270 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8271 	    NULL) == -1)
8272 		err(1, "pledge");
8273 #endif
8274 
8275 	if (argc == 0) {
8276 		if (hflag)
8277 			usage(hflag, 0);
8278 		/* Build an argument vector which runs a default command. */
8279 		cmd = &tog_commands[0];
8280 		argc = 1;
8281 		cmd_argv = make_argv(argc, cmd->name);
8282 	} else {
8283 		size_t i;
8284 
8285 		/* Did the user specify a command? */
8286 		for (i = 0; i < nitems(tog_commands); i++) {
8287 			if (strncmp(tog_commands[i].name, argv[0],
8288 			    strlen(argv[0])) == 0) {
8289 				cmd = &tog_commands[i];
8290 				break;
8291 			}
8292 		}
8293 	}
8294 
8295 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8296 	if (diff_algo_str) {
8297 		if (strcasecmp(diff_algo_str, "patience") == 0)
8298 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8299 		if (strcasecmp(diff_algo_str, "myers") == 0)
8300 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8301 	}
8302 
8303 	if (cmd == NULL) {
8304 		if (argc != 1)
8305 			usage(0, 1);
8306 		/* No command specified; try log with a path */
8307 		error = tog_log_with_path(argc, argv);
8308 	} else {
8309 		if (hflag)
8310 			cmd->cmd_usage();
8311 		else
8312 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8313 	}
8314 
8315 	endwin();
8316 	putchar('\n');
8317 	if (cmd_argv) {
8318 		int i;
8319 		for (i = 0; i < argc; i++)
8320 			free(cmd_argv[i]);
8321 		free(cmd_argv);
8322 	}
8323 
8324 	if (error && error->code != GOT_ERR_CANCELLED)
8325 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8326 	return 0;
8327 }