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 && v->child->type == TOG_VIEW_LOG)
995 			v->child->nscrolled = y - v->child->begin_y;
996 		else if (y < v->child->begin_y && v->type == TOG_VIEW_LOG)
997 			v->nscrolled = v->child->begin_y - y;
998 	} else {
999 		if (v->child->resized_x)
1000 			v->child->begin_x = v->child->resized_x;
1001 		if (view->parent)
1002 			v->child->begin_x -= resize;
1003 		else
1004 			v->child->begin_x += resize;
1005 		if (v->child->begin_x < 11) {
1006 			view->count = 0;
1007 			v->child->begin_x = 11;
1008 		} else if (v->child->begin_x > COLS - 1) {
1009 			view->count = 0;
1010 			v->child->begin_x = COLS - 1;
1011 		}
1012 		v->child->resized_x = v->child->begin_x;
1013 	}
1014 
1015 	v->child->mode = v->mode;
1016 	v->child->nlines = v->lines - v->child->begin_y;
1017 	v->child->ncols = v->cols - v->child->begin_x;
1018 	v->focus_child = 1;
1019 
1020 	err = view_fullscreen(v);
1021 	if (err)
1022 		return err;
1023 	err = view_splitscreen(v->child);
1024 	if (err)
1025 		return err;
1026 
1027 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1028 		err = offset_selection_down(v->child);
1029 		if (err)
1030 			return err;
1031 	}
1032 
1033 	if (v->nscrolled)
1034 		err = request_log_commits(v);
1035 	else if (v->child->nscrolled)
1036 		err = request_log_commits(v->child);
1037 
1038 	v->resize = v->child->resize = 0;
1039 
1040 	return err;
1041 }
1042 
1043 static void
1044 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1045 {
1046 	struct tog_view *v = src->child ? src->child : src;
1047 
1048 	dst->resized_x = v->resized_x;
1049 	dst->resized_y = v->resized_y;
1050 }
1051 
1052 static const struct got_error *
1053 view_close_child(struct tog_view *view)
1054 {
1055 	const struct got_error *err = NULL;
1056 
1057 	if (view->child == NULL)
1058 		return NULL;
1059 
1060 	err = view_close(view->child);
1061 	view->child = NULL;
1062 	return err;
1063 }
1064 
1065 static const struct got_error *
1066 view_set_child(struct tog_view *view, struct tog_view *child)
1067 {
1068 	const struct got_error *err = NULL;
1069 
1070 	view->child = child;
1071 	child->parent = view;
1072 
1073 	err = view_resize(view);
1074 	if (err)
1075 		return err;
1076 
1077 	if (view->child->resized_x || view->child->resized_y)
1078 		err = view_resize_split(view, 0);
1079 
1080 	return err;
1081 }
1082 
1083 static void
1084 tog_resizeterm(void)
1085 {
1086 	int cols, lines;
1087 	struct winsize size;
1088 
1089 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1090 		cols = 80;     /* Default */
1091 		lines = 24;
1092 	} else {
1093 		cols = size.ws_col;
1094 		lines = size.ws_row;
1095 	}
1096 	resize_term(lines, cols);
1097 }
1098 
1099 static const struct got_error *
1100 view_search_start(struct tog_view *view)
1101 {
1102 	const struct got_error *err = NULL;
1103 	struct tog_view *v = view;
1104 	char pattern[1024];
1105 	int ret;
1106 
1107 	if (view->search_started) {
1108 		regfree(&view->regex);
1109 		view->searching = 0;
1110 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1111 	}
1112 	view->search_started = 0;
1113 
1114 	if (view->nlines < 1)
1115 		return NULL;
1116 
1117 	if (view_is_hsplit_top(view))
1118 		v = view->child;
1119 
1120 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1121 	wclrtoeol(v->window);
1122 
1123 	nodelay(view->window, FALSE);  /* block for search term input */
1124 	nocbreak();
1125 	echo();
1126 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1127 	wrefresh(v->window);
1128 	cbreak();
1129 	noecho();
1130 	nodelay(view->window, TRUE);
1131 	if (ret == ERR)
1132 		return NULL;
1133 
1134 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1135 		err = view->search_start(view);
1136 		if (err) {
1137 			regfree(&view->regex);
1138 			return err;
1139 		}
1140 		view->search_started = 1;
1141 		view->searching = TOG_SEARCH_FORWARD;
1142 		view->search_next_done = 0;
1143 		view->search_next(view);
1144 	}
1145 
1146 	return NULL;
1147 }
1148 
1149 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1150 static const struct got_error *
1151 switch_split(struct tog_view *view)
1152 {
1153 	const struct got_error	*err = NULL;
1154 	struct tog_view		*v = NULL;
1155 
1156 	if (view->parent)
1157 		v = view->parent;
1158 	else
1159 		v = view;
1160 
1161 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1162 		v->mode = TOG_VIEW_SPLIT_VERT;
1163 	else
1164 		v->mode = TOG_VIEW_SPLIT_HRZN;
1165 
1166 	if (!v->child)
1167 		return NULL;
1168 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1169 		v->mode = TOG_VIEW_SPLIT_NONE;
1170 
1171 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1172 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1173 		v->child->begin_y = v->child->resized_y;
1174 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1175 		v->child->begin_x = v->child->resized_x;
1176 
1177 
1178 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1179 		v->ncols = COLS;
1180 		v->child->ncols = COLS;
1181 		v->child->nscrolled = LINES - v->child->nlines;
1182 
1183 		err = view_init_hsplit(v, v->child->begin_y);
1184 		if (err)
1185 			return err;
1186 	}
1187 	v->child->mode = v->mode;
1188 	v->child->nlines = v->lines - v->child->begin_y;
1189 	v->focus_child = 1;
1190 
1191 	err = view_fullscreen(v);
1192 	if (err)
1193 		return err;
1194 	err = view_splitscreen(v->child);
1195 	if (err)
1196 		return err;
1197 
1198 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1199 		v->mode = TOG_VIEW_SPLIT_VERT;
1200 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1201 		err = offset_selection_down(v);
1202 		err = offset_selection_down(v->child);
1203 	} else {
1204 		offset_selection_up(v);
1205 		offset_selection_up(v->child);
1206 	}
1207 	if (v->type == TOG_VIEW_LOG && v->nscrolled)
1208 		err = request_log_commits(v);
1209 	else if (v->child->type == TOG_VIEW_LOG && v->child->nscrolled)
1210 		err = request_log_commits(v->child);
1211 
1212 	return err;
1213 }
1214 
1215 /*
1216  * Compute view->count from numeric input. Assign total to view->count and
1217  * return first non-numeric key entered.
1218  */
1219 static int
1220 get_compound_key(struct tog_view *view, int c)
1221 {
1222 	struct tog_view	*v = view;
1223 	int		 x, n = 0;
1224 
1225 	if (view_is_hsplit_top(view))
1226 		v = view->child;
1227 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1228 		v = view->parent;
1229 
1230 	view->count = 0;
1231 	cbreak();  /* block for input */
1232 	wmove(v->window, v->nlines - 1, 0);
1233 	wclrtoeol(v->window);
1234 	waddch(v->window, ':');
1235 
1236 	do {
1237 		x = getcurx(v->window);
1238 		if (x != ERR && x < view->ncols) {
1239 			waddch(v->window, c);
1240 			wrefresh(v->window);
1241 		}
1242 
1243 		/*
1244 		 * Don't overflow. Max valid request should be the greatest
1245 		 * between the longest and total lines; cap at 10 million.
1246 		 */
1247 		if (n >= 9999999)
1248 			n = 9999999;
1249 		else
1250 			n = n * 10 + (c - '0');
1251 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1252 
1253 	/* Massage excessive or inapplicable values at the input handler. */
1254 	view->count = n;
1255 
1256 	return c;
1257 }
1258 
1259 static const struct got_error *
1260 view_input(struct tog_view **new, int *done, struct tog_view *view,
1261     struct tog_view_list_head *views)
1262 {
1263 	const struct got_error *err = NULL;
1264 	struct tog_view *v;
1265 	int ch, errcode;
1266 
1267 	*new = NULL;
1268 
1269 	/* Clear "no matches" indicator. */
1270 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1271 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1272 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1273 		view->count = 0;
1274 	}
1275 
1276 	if (view->searching && !view->search_next_done) {
1277 		errcode = pthread_mutex_unlock(&tog_mutex);
1278 		if (errcode)
1279 			return got_error_set_errno(errcode,
1280 			    "pthread_mutex_unlock");
1281 		sched_yield();
1282 		errcode = pthread_mutex_lock(&tog_mutex);
1283 		if (errcode)
1284 			return got_error_set_errno(errcode,
1285 			    "pthread_mutex_lock");
1286 		view->search_next(view);
1287 		return NULL;
1288 	}
1289 
1290 	nodelay(view->window, FALSE);
1291 	/* Allow threads to make progress while we are waiting for input. */
1292 	errcode = pthread_mutex_unlock(&tog_mutex);
1293 	if (errcode)
1294 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1295 	/* If we have an unfinished count, let C-g or backspace abort. */
1296 	if (view->count && --view->count) {
1297 		cbreak();
1298 		nodelay(view->window, TRUE);
1299 		ch = wgetch(view->window);
1300 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1301 			view->count = 0;
1302 		else
1303 			ch = view->ch;
1304 	} else {
1305 		ch = wgetch(view->window);
1306 		if (ch >= '1' && ch  <= '9')
1307 			view->ch = ch = get_compound_key(view, ch);
1308 	}
1309 	errcode = pthread_mutex_lock(&tog_mutex);
1310 	if (errcode)
1311 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1312 	nodelay(view->window, TRUE);
1313 
1314 	if (tog_sigwinch_received || tog_sigcont_received) {
1315 		tog_resizeterm();
1316 		tog_sigwinch_received = 0;
1317 		tog_sigcont_received = 0;
1318 		TAILQ_FOREACH(v, views, entry) {
1319 			err = view_resize(v);
1320 			if (err)
1321 				return err;
1322 			err = v->input(new, v, KEY_RESIZE);
1323 			if (err)
1324 				return err;
1325 			if (v->child) {
1326 				err = view_resize(v->child);
1327 				if (err)
1328 					return err;
1329 				err = v->child->input(new, v->child,
1330 				    KEY_RESIZE);
1331 				if (err)
1332 					return err;
1333 				if (v->child->resized_x || v->child->resized_y) {
1334 					err = view_resize_split(v, 0);
1335 					if (err)
1336 						return err;
1337 				}
1338 			}
1339 		}
1340 	}
1341 
1342 	switch (ch) {
1343 	case '\t':
1344 		view->count = 0;
1345 		if (view->child) {
1346 			view->focussed = 0;
1347 			view->child->focussed = 1;
1348 			view->focus_child = 1;
1349 		} else if (view->parent) {
1350 			view->focussed = 0;
1351 			view->parent->focussed = 1;
1352 			view->parent->focus_child = 0;
1353 			if (!view_is_splitscreen(view)) {
1354 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1355 				    view->parent->type == TOG_VIEW_LOG) {
1356 					err = request_log_commits(view->parent);
1357 					if (err)
1358 						return err;
1359 				}
1360 				offset_selection_up(view->parent);
1361 				err = view_fullscreen(view->parent);
1362 				if (err)
1363 					return err;
1364 			}
1365 		}
1366 		break;
1367 	case 'q':
1368 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1369 			if (view->parent->type == TOG_VIEW_LOG) {
1370 				/* might need more commits to fill fullscreen */
1371 				err = request_log_commits(view->parent);
1372 				if (err)
1373 					break;
1374 			}
1375 			offset_selection_up(view->parent);
1376 		}
1377 		err = view->input(new, view, ch);
1378 		view->dying = 1;
1379 		break;
1380 	case 'Q':
1381 		*done = 1;
1382 		break;
1383 	case 'F':
1384 		view->count = 0;
1385 		if (view_is_parent_view(view)) {
1386 			if (view->child == NULL)
1387 				break;
1388 			if (view_is_splitscreen(view->child)) {
1389 				view->focussed = 0;
1390 				view->child->focussed = 1;
1391 				err = view_fullscreen(view->child);
1392 			} else {
1393 				err = view_splitscreen(view->child);
1394 				if (!err)
1395 					err = view_resize_split(view, 0);
1396 			}
1397 			if (err)
1398 				break;
1399 			err = view->child->input(new, view->child,
1400 			    KEY_RESIZE);
1401 		} else {
1402 			if (view_is_splitscreen(view)) {
1403 				view->parent->focussed = 0;
1404 				view->focussed = 1;
1405 				err = view_fullscreen(view);
1406 			} else {
1407 				err = view_splitscreen(view);
1408 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1409 					err = view_resize(view->parent);
1410 				if (!err)
1411 					err = view_resize_split(view, 0);
1412 			}
1413 			if (err)
1414 				break;
1415 			err = view->input(new, view, KEY_RESIZE);
1416 		}
1417 		if (err)
1418 			break;
1419 		if (view->type == TOG_VIEW_LOG) {
1420 			err = request_log_commits(view);
1421 			if (err)
1422 				break;
1423 		}
1424 		if (view->parent)
1425 			err = offset_selection_down(view->parent);
1426 		if (!err)
1427 			err = offset_selection_down(view);
1428 		break;
1429 	case 'S':
1430 		view->count = 0;
1431 		err = switch_split(view);
1432 		break;
1433 	case '-':
1434 		err = view_resize_split(view, -1);
1435 		break;
1436 	case '+':
1437 		err = view_resize_split(view, 1);
1438 		break;
1439 	case KEY_RESIZE:
1440 		break;
1441 	case '/':
1442 		view->count = 0;
1443 		if (view->search_start)
1444 			view_search_start(view);
1445 		else
1446 			err = view->input(new, view, ch);
1447 		break;
1448 	case 'N':
1449 	case 'n':
1450 		if (view->search_started && view->search_next) {
1451 			view->searching = (ch == 'n' ?
1452 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1453 			view->search_next_done = 0;
1454 			view->search_next(view);
1455 		} else
1456 			err = view->input(new, view, ch);
1457 		break;
1458 	case 'A':
1459 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1460 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1461 		else
1462 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1463 		TAILQ_FOREACH(v, views, entry) {
1464 			if (v->reset) {
1465 				err = v->reset(v);
1466 				if (err)
1467 					return err;
1468 			}
1469 			if (v->child && v->child->reset) {
1470 				err = v->child->reset(v->child);
1471 				if (err)
1472 					return err;
1473 			}
1474 		}
1475 		break;
1476 	default:
1477 		err = view->input(new, view, ch);
1478 		break;
1479 	}
1480 
1481 	return err;
1482 }
1483 
1484 static int
1485 view_needs_focus_indication(struct tog_view *view)
1486 {
1487 	if (view_is_parent_view(view)) {
1488 		if (view->child == NULL || view->child->focussed)
1489 			return 0;
1490 		if (!view_is_splitscreen(view->child))
1491 			return 0;
1492 	} else if (!view_is_splitscreen(view))
1493 		return 0;
1494 
1495 	return view->focussed;
1496 }
1497 
1498 static const struct got_error *
1499 view_loop(struct tog_view *view)
1500 {
1501 	const struct got_error *err = NULL;
1502 	struct tog_view_list_head views;
1503 	struct tog_view *new_view;
1504 	char *mode;
1505 	int fast_refresh = 10;
1506 	int done = 0, errcode;
1507 
1508 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1509 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1510 		view->mode = TOG_VIEW_SPLIT_VERT;
1511 	else
1512 		view->mode = TOG_VIEW_SPLIT_HRZN;
1513 
1514 	errcode = pthread_mutex_lock(&tog_mutex);
1515 	if (errcode)
1516 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1517 
1518 	TAILQ_INIT(&views);
1519 	TAILQ_INSERT_HEAD(&views, view, entry);
1520 
1521 	view->focussed = 1;
1522 	err = view->show(view);
1523 	if (err)
1524 		return err;
1525 	update_panels();
1526 	doupdate();
1527 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1528 	    !tog_fatal_signal_received()) {
1529 		/* Refresh fast during initialization, then become slower. */
1530 		if (fast_refresh && fast_refresh-- == 0)
1531 			halfdelay(10); /* switch to once per second */
1532 
1533 		err = view_input(&new_view, &done, view, &views);
1534 		if (err)
1535 			break;
1536 		if (view->dying) {
1537 			struct tog_view *v, *prev = NULL;
1538 
1539 			if (view_is_parent_view(view))
1540 				prev = TAILQ_PREV(view, tog_view_list_head,
1541 				    entry);
1542 			else if (view->parent)
1543 				prev = view->parent;
1544 
1545 			if (view->parent) {
1546 				view->parent->child = NULL;
1547 				view->parent->focus_child = 0;
1548 				/* Restore fullscreen line height. */
1549 				view->parent->nlines = view->parent->lines;
1550 				err = view_resize(view->parent);
1551 				if (err)
1552 					break;
1553 				/* Make resized splits persist. */
1554 				view_transfer_size(view->parent, view);
1555 			} else
1556 				TAILQ_REMOVE(&views, view, entry);
1557 
1558 			err = view_close(view);
1559 			if (err)
1560 				goto done;
1561 
1562 			view = NULL;
1563 			TAILQ_FOREACH(v, &views, entry) {
1564 				if (v->focussed)
1565 					break;
1566 			}
1567 			if (view == NULL && new_view == NULL) {
1568 				/* No view has focus. Try to pick one. */
1569 				if (prev)
1570 					view = prev;
1571 				else if (!TAILQ_EMPTY(&views)) {
1572 					view = TAILQ_LAST(&views,
1573 					    tog_view_list_head);
1574 				}
1575 				if (view) {
1576 					if (view->focus_child) {
1577 						view->child->focussed = 1;
1578 						view = view->child;
1579 					} else
1580 						view->focussed = 1;
1581 				}
1582 			}
1583 		}
1584 		if (new_view) {
1585 			struct tog_view *v, *t;
1586 			/* Only allow one parent view per type. */
1587 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1588 				if (v->type != new_view->type)
1589 					continue;
1590 				TAILQ_REMOVE(&views, v, entry);
1591 				err = view_close(v);
1592 				if (err)
1593 					goto done;
1594 				break;
1595 			}
1596 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1597 			view = new_view;
1598 		}
1599 		if (view) {
1600 			if (view_is_parent_view(view)) {
1601 				if (view->child && view->child->focussed)
1602 					view = view->child;
1603 			} else {
1604 				if (view->parent && view->parent->focussed)
1605 					view = view->parent;
1606 			}
1607 			show_panel(view->panel);
1608 			if (view->child && view_is_splitscreen(view->child))
1609 				show_panel(view->child->panel);
1610 			if (view->parent && view_is_splitscreen(view)) {
1611 				err = view->parent->show(view->parent);
1612 				if (err)
1613 					goto done;
1614 			}
1615 			err = view->show(view);
1616 			if (err)
1617 				goto done;
1618 			if (view->child) {
1619 				err = view->child->show(view->child);
1620 				if (err)
1621 					goto done;
1622 			}
1623 			update_panels();
1624 			doupdate();
1625 		}
1626 	}
1627 done:
1628 	while (!TAILQ_EMPTY(&views)) {
1629 		const struct got_error *close_err;
1630 		view = TAILQ_FIRST(&views);
1631 		TAILQ_REMOVE(&views, view, entry);
1632 		close_err = view_close(view);
1633 		if (close_err && err == NULL)
1634 			err = close_err;
1635 	}
1636 
1637 	errcode = pthread_mutex_unlock(&tog_mutex);
1638 	if (errcode && err == NULL)
1639 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1640 
1641 	return err;
1642 }
1643 
1644 __dead static void
1645 usage_log(void)
1646 {
1647 	endwin();
1648 	fprintf(stderr,
1649 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1650 	    getprogname());
1651 	exit(1);
1652 }
1653 
1654 /* Create newly allocated wide-character string equivalent to a byte string. */
1655 static const struct got_error *
1656 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1657 {
1658 	char *vis = NULL;
1659 	const struct got_error *err = NULL;
1660 
1661 	*ws = NULL;
1662 	*wlen = mbstowcs(NULL, s, 0);
1663 	if (*wlen == (size_t)-1) {
1664 		int vislen;
1665 		if (errno != EILSEQ)
1666 			return got_error_from_errno("mbstowcs");
1667 
1668 		/* byte string invalid in current encoding; try to "fix" it */
1669 		err = got_mbsavis(&vis, &vislen, s);
1670 		if (err)
1671 			return err;
1672 		*wlen = mbstowcs(NULL, vis, 0);
1673 		if (*wlen == (size_t)-1) {
1674 			err = got_error_from_errno("mbstowcs"); /* give up */
1675 			goto done;
1676 		}
1677 	}
1678 
1679 	*ws = calloc(*wlen + 1, sizeof(**ws));
1680 	if (*ws == NULL) {
1681 		err = got_error_from_errno("calloc");
1682 		goto done;
1683 	}
1684 
1685 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1686 		err = got_error_from_errno("mbstowcs");
1687 done:
1688 	free(vis);
1689 	if (err) {
1690 		free(*ws);
1691 		*ws = NULL;
1692 		*wlen = 0;
1693 	}
1694 	return err;
1695 }
1696 
1697 static const struct got_error *
1698 expand_tab(char **ptr, const char *src)
1699 {
1700 	char	*dst;
1701 	size_t	 len, n, idx = 0, sz = 0;
1702 
1703 	*ptr = NULL;
1704 	n = len = strlen(src);
1705 	dst = malloc(n + 1);
1706 	if (dst == NULL)
1707 		return got_error_from_errno("malloc");
1708 
1709 	while (idx < len && src[idx]) {
1710 		const char c = src[idx];
1711 
1712 		if (c == '\t') {
1713 			size_t nb = TABSIZE - sz % TABSIZE;
1714 			char *p;
1715 
1716 			p = realloc(dst, n + nb);
1717 			if (p == NULL) {
1718 				free(dst);
1719 				return got_error_from_errno("realloc");
1720 
1721 			}
1722 			dst = p;
1723 			n += nb;
1724 			memset(dst + sz, ' ', nb);
1725 			sz += nb;
1726 		} else
1727 			dst[sz++] = src[idx];
1728 		++idx;
1729 	}
1730 
1731 	dst[sz] = '\0';
1732 	*ptr = dst;
1733 	return NULL;
1734 }
1735 
1736 /*
1737  * Advance at most n columns from wline starting at offset off.
1738  * Return the index to the first character after the span operation.
1739  * Return the combined column width of all spanned wide character in
1740  * *rcol.
1741  */
1742 static int
1743 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1744 {
1745 	int width, i, cols = 0;
1746 
1747 	if (n == 0) {
1748 		*rcol = cols;
1749 		return off;
1750 	}
1751 
1752 	for (i = off; wline[i] != L'\0'; ++i) {
1753 		if (wline[i] == L'\t')
1754 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1755 		else
1756 			width = wcwidth(wline[i]);
1757 
1758 		if (width == -1) {
1759 			width = 1;
1760 			wline[i] = L'.';
1761 		}
1762 
1763 		if (cols + width > n)
1764 			break;
1765 		cols += width;
1766 	}
1767 
1768 	*rcol = cols;
1769 	return i;
1770 }
1771 
1772 /*
1773  * Format a line for display, ensuring that it won't overflow a width limit.
1774  * With scrolling, the width returned refers to the scrolled version of the
1775  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1776  */
1777 static const struct got_error *
1778 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1779     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1780 {
1781 	const struct got_error *err = NULL;
1782 	int cols;
1783 	wchar_t *wline = NULL;
1784 	char *exstr = NULL;
1785 	size_t wlen;
1786 	int i, scrollx;
1787 
1788 	*wlinep = NULL;
1789 	*widthp = 0;
1790 
1791 	if (expand) {
1792 		err = expand_tab(&exstr, line);
1793 		if (err)
1794 			return err;
1795 	}
1796 
1797 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1798 	free(exstr);
1799 	if (err)
1800 		return err;
1801 
1802 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1803 
1804 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1805 		wline[wlen - 1] = L'\0';
1806 		wlen--;
1807 	}
1808 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1809 		wline[wlen - 1] = L'\0';
1810 		wlen--;
1811 	}
1812 
1813 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1814 	wline[i] = L'\0';
1815 
1816 	if (widthp)
1817 		*widthp = cols;
1818 	if (scrollxp)
1819 		*scrollxp = scrollx;
1820 	if (err)
1821 		free(wline);
1822 	else
1823 		*wlinep = wline;
1824 	return err;
1825 }
1826 
1827 static const struct got_error*
1828 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1829     struct got_object_id *id, struct got_repository *repo)
1830 {
1831 	static const struct got_error *err = NULL;
1832 	struct got_reflist_entry *re;
1833 	char *s;
1834 	const char *name;
1835 
1836 	*refs_str = NULL;
1837 
1838 	TAILQ_FOREACH(re, refs, entry) {
1839 		struct got_tag_object *tag = NULL;
1840 		struct got_object_id *ref_id;
1841 		int cmp;
1842 
1843 		name = got_ref_get_name(re->ref);
1844 		if (strcmp(name, GOT_REF_HEAD) == 0)
1845 			continue;
1846 		if (strncmp(name, "refs/", 5) == 0)
1847 			name += 5;
1848 		if (strncmp(name, "got/", 4) == 0 &&
1849 		    strncmp(name, "got/backup/", 11) != 0)
1850 			continue;
1851 		if (strncmp(name, "heads/", 6) == 0)
1852 			name += 6;
1853 		if (strncmp(name, "remotes/", 8) == 0) {
1854 			name += 8;
1855 			s = strstr(name, "/" GOT_REF_HEAD);
1856 			if (s != NULL && s[strlen(s)] == '\0')
1857 				continue;
1858 		}
1859 		err = got_ref_resolve(&ref_id, repo, re->ref);
1860 		if (err)
1861 			break;
1862 		if (strncmp(name, "tags/", 5) == 0) {
1863 			err = got_object_open_as_tag(&tag, repo, ref_id);
1864 			if (err) {
1865 				if (err->code != GOT_ERR_OBJ_TYPE) {
1866 					free(ref_id);
1867 					break;
1868 				}
1869 				/* Ref points at something other than a tag. */
1870 				err = NULL;
1871 				tag = NULL;
1872 			}
1873 		}
1874 		cmp = got_object_id_cmp(tag ?
1875 		    got_object_tag_get_object_id(tag) : ref_id, id);
1876 		free(ref_id);
1877 		if (tag)
1878 			got_object_tag_close(tag);
1879 		if (cmp != 0)
1880 			continue;
1881 		s = *refs_str;
1882 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1883 		    s ? ", " : "", name) == -1) {
1884 			err = got_error_from_errno("asprintf");
1885 			free(s);
1886 			*refs_str = NULL;
1887 			break;
1888 		}
1889 		free(s);
1890 	}
1891 
1892 	return err;
1893 }
1894 
1895 static const struct got_error *
1896 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1897     int col_tab_align)
1898 {
1899 	char *smallerthan;
1900 
1901 	smallerthan = strchr(author, '<');
1902 	if (smallerthan && smallerthan[1] != '\0')
1903 		author = smallerthan + 1;
1904 	author[strcspn(author, "@>")] = '\0';
1905 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1906 	    col_tab_align, 0);
1907 }
1908 
1909 static const struct got_error *
1910 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1911     struct got_object_id *id, const size_t date_display_cols,
1912     int author_display_cols)
1913 {
1914 	struct tog_log_view_state *s = &view->state.log;
1915 	const struct got_error *err = NULL;
1916 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1917 	char *logmsg0 = NULL, *logmsg = NULL;
1918 	char *author = NULL;
1919 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1920 	int author_width, logmsg_width;
1921 	char *newline, *line = NULL;
1922 	int col, limit, scrollx;
1923 	const int avail = view->ncols;
1924 	struct tm tm;
1925 	time_t committer_time;
1926 	struct tog_color *tc;
1927 
1928 	committer_time = got_object_commit_get_committer_time(commit);
1929 	if (gmtime_r(&committer_time, &tm) == NULL)
1930 		return got_error_from_errno("gmtime_r");
1931 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1932 		return got_error(GOT_ERR_NO_SPACE);
1933 
1934 	if (avail <= date_display_cols)
1935 		limit = MIN(sizeof(datebuf) - 1, avail);
1936 	else
1937 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1938 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1939 	if (tc)
1940 		wattr_on(view->window,
1941 		    COLOR_PAIR(tc->colorpair), NULL);
1942 	waddnstr(view->window, datebuf, limit);
1943 	if (tc)
1944 		wattr_off(view->window,
1945 		    COLOR_PAIR(tc->colorpair), NULL);
1946 	col = limit;
1947 	if (col > avail)
1948 		goto done;
1949 
1950 	if (avail >= 120) {
1951 		char *id_str;
1952 		err = got_object_id_str(&id_str, id);
1953 		if (err)
1954 			goto done;
1955 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1956 		if (tc)
1957 			wattr_on(view->window,
1958 			    COLOR_PAIR(tc->colorpair), NULL);
1959 		wprintw(view->window, "%.8s ", id_str);
1960 		if (tc)
1961 			wattr_off(view->window,
1962 			    COLOR_PAIR(tc->colorpair), NULL);
1963 		free(id_str);
1964 		col += 9;
1965 		if (col > avail)
1966 			goto done;
1967 	}
1968 
1969 	author = strdup(got_object_commit_get_author(commit));
1970 	if (author == NULL) {
1971 		err = got_error_from_errno("strdup");
1972 		goto done;
1973 	}
1974 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1975 	if (err)
1976 		goto done;
1977 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1978 	if (tc)
1979 		wattr_on(view->window,
1980 		    COLOR_PAIR(tc->colorpair), NULL);
1981 	waddwstr(view->window, wauthor);
1982 	if (tc)
1983 		wattr_off(view->window,
1984 		    COLOR_PAIR(tc->colorpair), NULL);
1985 	col += author_width;
1986 	while (col < avail && author_width < author_display_cols + 2) {
1987 		waddch(view->window, ' ');
1988 		col++;
1989 		author_width++;
1990 	}
1991 	if (col > avail)
1992 		goto done;
1993 
1994 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1995 	if (err)
1996 		goto done;
1997 	logmsg = logmsg0;
1998 	while (*logmsg == '\n')
1999 		logmsg++;
2000 	newline = strchr(logmsg, '\n');
2001 	if (newline)
2002 		*newline = '\0';
2003 	limit = avail - col;
2004 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2005 		limit--;	/* for the border */
2006 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2007 	    limit, col, 1);
2008 	if (err)
2009 		goto done;
2010 	waddwstr(view->window, &wlogmsg[scrollx]);
2011 	col += MAX(logmsg_width, 0);
2012 	while (col < avail) {
2013 		waddch(view->window, ' ');
2014 		col++;
2015 	}
2016 done:
2017 	free(logmsg0);
2018 	free(wlogmsg);
2019 	free(author);
2020 	free(wauthor);
2021 	free(line);
2022 	return err;
2023 }
2024 
2025 static struct commit_queue_entry *
2026 alloc_commit_queue_entry(struct got_commit_object *commit,
2027     struct got_object_id *id)
2028 {
2029 	struct commit_queue_entry *entry;
2030 
2031 	entry = calloc(1, sizeof(*entry));
2032 	if (entry == NULL)
2033 		return NULL;
2034 
2035 	entry->id = id;
2036 	entry->commit = commit;
2037 	return entry;
2038 }
2039 
2040 static void
2041 pop_commit(struct commit_queue *commits)
2042 {
2043 	struct commit_queue_entry *entry;
2044 
2045 	entry = TAILQ_FIRST(&commits->head);
2046 	TAILQ_REMOVE(&commits->head, entry, entry);
2047 	got_object_commit_close(entry->commit);
2048 	commits->ncommits--;
2049 	/* Don't free entry->id! It is owned by the commit graph. */
2050 	free(entry);
2051 }
2052 
2053 static void
2054 free_commits(struct commit_queue *commits)
2055 {
2056 	while (!TAILQ_EMPTY(&commits->head))
2057 		pop_commit(commits);
2058 }
2059 
2060 static const struct got_error *
2061 match_commit(int *have_match, struct got_object_id *id,
2062     struct got_commit_object *commit, regex_t *regex)
2063 {
2064 	const struct got_error *err = NULL;
2065 	regmatch_t regmatch;
2066 	char *id_str = NULL, *logmsg = NULL;
2067 
2068 	*have_match = 0;
2069 
2070 	err = got_object_id_str(&id_str, id);
2071 	if (err)
2072 		return err;
2073 
2074 	err = got_object_commit_get_logmsg(&logmsg, commit);
2075 	if (err)
2076 		goto done;
2077 
2078 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2079 	    &regmatch, 0) == 0 ||
2080 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2081 	    &regmatch, 0) == 0 ||
2082 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2083 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2084 		*have_match = 1;
2085 done:
2086 	free(id_str);
2087 	free(logmsg);
2088 	return err;
2089 }
2090 
2091 static const struct got_error *
2092 queue_commits(struct tog_log_thread_args *a)
2093 {
2094 	const struct got_error *err = NULL;
2095 
2096 	/*
2097 	 * We keep all commits open throughout the lifetime of the log
2098 	 * view in order to avoid having to re-fetch commits from disk
2099 	 * while updating the display.
2100 	 */
2101 	do {
2102 		struct got_object_id *id;
2103 		struct got_commit_object *commit;
2104 		struct commit_queue_entry *entry;
2105 		int errcode;
2106 
2107 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2108 		    NULL, NULL);
2109 		if (err || id == NULL)
2110 			break;
2111 
2112 		err = got_object_open_as_commit(&commit, a->repo, id);
2113 		if (err)
2114 			break;
2115 		entry = alloc_commit_queue_entry(commit, id);
2116 		if (entry == NULL) {
2117 			err = got_error_from_errno("alloc_commit_queue_entry");
2118 			break;
2119 		}
2120 
2121 		errcode = pthread_mutex_lock(&tog_mutex);
2122 		if (errcode) {
2123 			err = got_error_set_errno(errcode,
2124 			    "pthread_mutex_lock");
2125 			break;
2126 		}
2127 
2128 		entry->idx = a->commits->ncommits;
2129 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2130 		a->commits->ncommits++;
2131 
2132 		if (*a->searching == TOG_SEARCH_FORWARD &&
2133 		    !*a->search_next_done) {
2134 			int have_match;
2135 			err = match_commit(&have_match, id, commit, a->regex);
2136 			if (err)
2137 				break;
2138 			if (have_match)
2139 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2140 		}
2141 
2142 		errcode = pthread_mutex_unlock(&tog_mutex);
2143 		if (errcode && err == NULL)
2144 			err = got_error_set_errno(errcode,
2145 			    "pthread_mutex_unlock");
2146 		if (err)
2147 			break;
2148 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2149 
2150 	return err;
2151 }
2152 
2153 static void
2154 select_commit(struct tog_log_view_state *s)
2155 {
2156 	struct commit_queue_entry *entry;
2157 	int ncommits = 0;
2158 
2159 	entry = s->first_displayed_entry;
2160 	while (entry) {
2161 		if (ncommits == s->selected) {
2162 			s->selected_entry = entry;
2163 			break;
2164 		}
2165 		entry = TAILQ_NEXT(entry, entry);
2166 		ncommits++;
2167 	}
2168 }
2169 
2170 static const struct got_error *
2171 draw_commits(struct tog_view *view)
2172 {
2173 	const struct got_error *err = NULL;
2174 	struct tog_log_view_state *s = &view->state.log;
2175 	struct commit_queue_entry *entry = s->selected_entry;
2176 	const int limit = view->nlines;
2177 	int width;
2178 	int ncommits, author_cols = 4;
2179 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2180 	char *refs_str = NULL;
2181 	wchar_t *wline;
2182 	struct tog_color *tc;
2183 	static const size_t date_display_cols = 12;
2184 
2185 	if (s->selected_entry &&
2186 	    !(view->searching && view->search_next_done == 0)) {
2187 		struct got_reflist_head *refs;
2188 		err = got_object_id_str(&id_str, s->selected_entry->id);
2189 		if (err)
2190 			return err;
2191 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2192 		    s->selected_entry->id);
2193 		if (refs) {
2194 			err = build_refs_str(&refs_str, refs,
2195 			    s->selected_entry->id, s->repo);
2196 			if (err)
2197 				goto done;
2198 		}
2199 	}
2200 
2201 	if (s->thread_args.commits_needed == 0)
2202 		halfdelay(10); /* disable fast refresh */
2203 
2204 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2205 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2206 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2207 		    (view->searching && !view->search_next_done) ?
2208 		    "searching..." : "loading...") == -1) {
2209 			err = got_error_from_errno("asprintf");
2210 			goto done;
2211 		}
2212 	} else {
2213 		const char *search_str = NULL;
2214 
2215 		if (view->searching) {
2216 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2217 				search_str = "no more matches";
2218 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2219 				search_str = "no matches found";
2220 			else if (!view->search_next_done)
2221 				search_str = "searching...";
2222 		}
2223 
2224 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2225 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2226 		    search_str ? search_str :
2227 		    (refs_str ? refs_str : "")) == -1) {
2228 			err = got_error_from_errno("asprintf");
2229 			goto done;
2230 		}
2231 	}
2232 
2233 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2234 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2235 		    "........................................",
2236 		    s->in_repo_path, ncommits_str) == -1) {
2237 			err = got_error_from_errno("asprintf");
2238 			header = NULL;
2239 			goto done;
2240 		}
2241 	} else if (asprintf(&header, "commit %s%s",
2242 	    id_str ? id_str : "........................................",
2243 	    ncommits_str) == -1) {
2244 		err = got_error_from_errno("asprintf");
2245 		header = NULL;
2246 		goto done;
2247 	}
2248 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2249 	if (err)
2250 		goto done;
2251 
2252 	werase(view->window);
2253 
2254 	if (view_needs_focus_indication(view))
2255 		wstandout(view->window);
2256 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2257 	if (tc)
2258 		wattr_on(view->window,
2259 		    COLOR_PAIR(tc->colorpair), NULL);
2260 	waddwstr(view->window, wline);
2261 	if (tc)
2262 		wattr_off(view->window,
2263 		    COLOR_PAIR(tc->colorpair), NULL);
2264 	while (width < view->ncols) {
2265 		waddch(view->window, ' ');
2266 		width++;
2267 	}
2268 	if (view_needs_focus_indication(view))
2269 		wstandend(view->window);
2270 	free(wline);
2271 	if (limit <= 1)
2272 		goto done;
2273 
2274 	/* Grow author column size if necessary, and set view->maxx. */
2275 	entry = s->first_displayed_entry;
2276 	ncommits = 0;
2277 	view->maxx = 0;
2278 	while (entry) {
2279 		char *author, *eol, *msg, *msg0;
2280 		wchar_t *wauthor, *wmsg;
2281 		int width;
2282 		if (ncommits >= limit - 1)
2283 			break;
2284 		author = strdup(got_object_commit_get_author(entry->commit));
2285 		if (author == NULL) {
2286 			err = got_error_from_errno("strdup");
2287 			goto done;
2288 		}
2289 		err = format_author(&wauthor, &width, author, COLS,
2290 		    date_display_cols);
2291 		if (author_cols < width)
2292 			author_cols = width;
2293 		free(wauthor);
2294 		free(author);
2295 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
2296 		if (err)
2297 			goto done;
2298 		msg = msg0;
2299 		while (*msg == '\n')
2300 			++msg;
2301 		if ((eol = strchr(msg, '\n')))
2302 			*eol = '\0';
2303 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2304 		    date_display_cols + author_cols, 0);
2305 		if (err)
2306 			goto done;
2307 		view->maxx = MAX(view->maxx, width);
2308 		free(msg0);
2309 		free(wmsg);
2310 		ncommits++;
2311 		entry = TAILQ_NEXT(entry, entry);
2312 	}
2313 
2314 	entry = s->first_displayed_entry;
2315 	s->last_displayed_entry = s->first_displayed_entry;
2316 	ncommits = 0;
2317 	while (entry) {
2318 		if (ncommits >= limit - 1)
2319 			break;
2320 		if (ncommits == s->selected)
2321 			wstandout(view->window);
2322 		err = draw_commit(view, entry->commit, entry->id,
2323 		    date_display_cols, author_cols);
2324 		if (ncommits == s->selected)
2325 			wstandend(view->window);
2326 		if (err)
2327 			goto done;
2328 		ncommits++;
2329 		s->last_displayed_entry = entry;
2330 		entry = TAILQ_NEXT(entry, entry);
2331 	}
2332 
2333 	view_border(view);
2334 done:
2335 	free(id_str);
2336 	free(refs_str);
2337 	free(ncommits_str);
2338 	free(header);
2339 	return err;
2340 }
2341 
2342 static void
2343 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2344 {
2345 	struct commit_queue_entry *entry;
2346 	int nscrolled = 0;
2347 
2348 	entry = TAILQ_FIRST(&s->commits.head);
2349 	if (s->first_displayed_entry == entry)
2350 		return;
2351 
2352 	entry = s->first_displayed_entry;
2353 	while (entry && nscrolled < maxscroll) {
2354 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2355 		if (entry) {
2356 			s->first_displayed_entry = entry;
2357 			nscrolled++;
2358 		}
2359 	}
2360 }
2361 
2362 static const struct got_error *
2363 trigger_log_thread(struct tog_view *view, int wait)
2364 {
2365 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2366 	int errcode;
2367 
2368 	halfdelay(1); /* fast refresh while loading commits */
2369 
2370 	while (!ta->log_complete && !tog_thread_error &&
2371 	    (ta->commits_needed > 0 || ta->load_all)) {
2372 		/* Wake the log thread. */
2373 		errcode = pthread_cond_signal(&ta->need_commits);
2374 		if (errcode)
2375 			return got_error_set_errno(errcode,
2376 			    "pthread_cond_signal");
2377 
2378 		/*
2379 		 * The mutex will be released while the view loop waits
2380 		 * in wgetch(), at which time the log thread will run.
2381 		 */
2382 		if (!wait)
2383 			break;
2384 
2385 		/* Display progress update in log view. */
2386 		show_log_view(view);
2387 		update_panels();
2388 		doupdate();
2389 
2390 		/* Wait right here while next commit is being loaded. */
2391 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2392 		if (errcode)
2393 			return got_error_set_errno(errcode,
2394 			    "pthread_cond_wait");
2395 
2396 		/* Display progress update in log view. */
2397 		show_log_view(view);
2398 		update_panels();
2399 		doupdate();
2400 	}
2401 
2402 	return NULL;
2403 }
2404 
2405 static const struct got_error *
2406 request_log_commits(struct tog_view *view)
2407 {
2408 	struct tog_log_view_state	*state = &view->state.log;
2409 	const struct got_error		*err = NULL;
2410 
2411 	if (state->thread_args.log_complete)
2412 		return NULL;
2413 
2414 	state->thread_args.commits_needed += view->nscrolled;
2415 	err = trigger_log_thread(view, 1);
2416 	view->nscrolled = 0;
2417 
2418 	return err;
2419 }
2420 
2421 static const struct got_error *
2422 log_scroll_down(struct tog_view *view, int maxscroll)
2423 {
2424 	struct tog_log_view_state *s = &view->state.log;
2425 	const struct got_error *err = NULL;
2426 	struct commit_queue_entry *pentry;
2427 	int nscrolled = 0, ncommits_needed;
2428 
2429 	if (s->last_displayed_entry == NULL)
2430 		return NULL;
2431 
2432 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2433 	if (s->commits.ncommits < ncommits_needed &&
2434 	    !s->thread_args.log_complete) {
2435 		/*
2436 		 * Ask the log thread for required amount of commits.
2437 		 */
2438 		s->thread_args.commits_needed += maxscroll;
2439 		err = trigger_log_thread(view, 1);
2440 		if (err)
2441 			return err;
2442 	}
2443 
2444 	do {
2445 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2446 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2447 			break;
2448 
2449 		s->last_displayed_entry = pentry ?
2450 		    pentry : s->last_displayed_entry;;
2451 
2452 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2453 		if (pentry == NULL)
2454 			break;
2455 		s->first_displayed_entry = pentry;
2456 	} while (++nscrolled < maxscroll);
2457 
2458 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2459 		view->nscrolled += nscrolled;
2460 	else
2461 		view->nscrolled = 0;
2462 
2463 	return err;
2464 }
2465 
2466 static const struct got_error *
2467 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2468     struct got_commit_object *commit, struct got_object_id *commit_id,
2469     struct tog_view *log_view, struct got_repository *repo)
2470 {
2471 	const struct got_error *err;
2472 	struct got_object_qid *parent_id;
2473 	struct tog_view *diff_view;
2474 
2475 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2476 	if (diff_view == NULL)
2477 		return got_error_from_errno("view_open");
2478 
2479 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2480 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2481 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2482 	if (err == NULL)
2483 		*new_view = diff_view;
2484 	return err;
2485 }
2486 
2487 static const struct got_error *
2488 tree_view_visit_subtree(struct tog_tree_view_state *s,
2489     struct got_tree_object *subtree)
2490 {
2491 	struct tog_parent_tree *parent;
2492 
2493 	parent = calloc(1, sizeof(*parent));
2494 	if (parent == NULL)
2495 		return got_error_from_errno("calloc");
2496 
2497 	parent->tree = s->tree;
2498 	parent->first_displayed_entry = s->first_displayed_entry;
2499 	parent->selected_entry = s->selected_entry;
2500 	parent->selected = s->selected;
2501 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2502 	s->tree = subtree;
2503 	s->selected = 0;
2504 	s->first_displayed_entry = NULL;
2505 	return NULL;
2506 }
2507 
2508 static const struct got_error *
2509 tree_view_walk_path(struct tog_tree_view_state *s,
2510     struct got_commit_object *commit, const char *path)
2511 {
2512 	const struct got_error *err = NULL;
2513 	struct got_tree_object *tree = NULL;
2514 	const char *p;
2515 	char *slash, *subpath = NULL;
2516 
2517 	/* Walk the path and open corresponding tree objects. */
2518 	p = path;
2519 	while (*p) {
2520 		struct got_tree_entry *te;
2521 		struct got_object_id *tree_id;
2522 		char *te_name;
2523 
2524 		while (p[0] == '/')
2525 			p++;
2526 
2527 		/* Ensure the correct subtree entry is selected. */
2528 		slash = strchr(p, '/');
2529 		if (slash == NULL)
2530 			te_name = strdup(p);
2531 		else
2532 			te_name = strndup(p, slash - p);
2533 		if (te_name == NULL) {
2534 			err = got_error_from_errno("strndup");
2535 			break;
2536 		}
2537 		te = got_object_tree_find_entry(s->tree, te_name);
2538 		if (te == NULL) {
2539 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2540 			free(te_name);
2541 			break;
2542 		}
2543 		free(te_name);
2544 		s->first_displayed_entry = s->selected_entry = te;
2545 
2546 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2547 			break; /* jump to this file's entry */
2548 
2549 		slash = strchr(p, '/');
2550 		if (slash)
2551 			subpath = strndup(path, slash - path);
2552 		else
2553 			subpath = strdup(path);
2554 		if (subpath == NULL) {
2555 			err = got_error_from_errno("strdup");
2556 			break;
2557 		}
2558 
2559 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2560 		    subpath);
2561 		if (err)
2562 			break;
2563 
2564 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2565 		free(tree_id);
2566 		if (err)
2567 			break;
2568 
2569 		err = tree_view_visit_subtree(s, tree);
2570 		if (err) {
2571 			got_object_tree_close(tree);
2572 			break;
2573 		}
2574 		if (slash == NULL)
2575 			break;
2576 		free(subpath);
2577 		subpath = NULL;
2578 		p = slash;
2579 	}
2580 
2581 	free(subpath);
2582 	return err;
2583 }
2584 
2585 static const struct got_error *
2586 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2587     struct commit_queue_entry *entry, const char *path,
2588     const char *head_ref_name, struct got_repository *repo)
2589 {
2590 	const struct got_error *err = NULL;
2591 	struct tog_tree_view_state *s;
2592 	struct tog_view *tree_view;
2593 
2594 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2595 	if (tree_view == NULL)
2596 		return got_error_from_errno("view_open");
2597 
2598 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2599 	if (err)
2600 		return err;
2601 	s = &tree_view->state.tree;
2602 
2603 	*new_view = tree_view;
2604 
2605 	if (got_path_is_root_dir(path))
2606 		return NULL;
2607 
2608 	return tree_view_walk_path(s, entry->commit, path);
2609 }
2610 
2611 static const struct got_error *
2612 block_signals_used_by_main_thread(void)
2613 {
2614 	sigset_t sigset;
2615 	int errcode;
2616 
2617 	if (sigemptyset(&sigset) == -1)
2618 		return got_error_from_errno("sigemptyset");
2619 
2620 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2621 	if (sigaddset(&sigset, SIGWINCH) == -1)
2622 		return got_error_from_errno("sigaddset");
2623 	if (sigaddset(&sigset, SIGCONT) == -1)
2624 		return got_error_from_errno("sigaddset");
2625 	if (sigaddset(&sigset, SIGINT) == -1)
2626 		return got_error_from_errno("sigaddset");
2627 	if (sigaddset(&sigset, SIGTERM) == -1)
2628 		return got_error_from_errno("sigaddset");
2629 
2630 	/* ncurses handles SIGTSTP */
2631 	if (sigaddset(&sigset, SIGTSTP) == -1)
2632 		return got_error_from_errno("sigaddset");
2633 
2634 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2635 	if (errcode)
2636 		return got_error_set_errno(errcode, "pthread_sigmask");
2637 
2638 	return NULL;
2639 }
2640 
2641 static void *
2642 log_thread(void *arg)
2643 {
2644 	const struct got_error *err = NULL;
2645 	int errcode = 0;
2646 	struct tog_log_thread_args *a = arg;
2647 	int done = 0;
2648 
2649 	/*
2650 	 * Sync startup with main thread such that we begin our
2651 	 * work once view_input() has released the mutex.
2652 	 */
2653 	errcode = pthread_mutex_lock(&tog_mutex);
2654 	if (errcode) {
2655 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2656 		return (void *)err;
2657 	}
2658 
2659 	err = block_signals_used_by_main_thread();
2660 	if (err) {
2661 		pthread_mutex_unlock(&tog_mutex);
2662 		goto done;
2663 	}
2664 
2665 	while (!done && !err && !tog_fatal_signal_received()) {
2666 		errcode = pthread_mutex_unlock(&tog_mutex);
2667 		if (errcode) {
2668 			err = got_error_set_errno(errcode,
2669 			    "pthread_mutex_unlock");
2670 			goto done;
2671 		}
2672 		err = queue_commits(a);
2673 		if (err) {
2674 			if (err->code != GOT_ERR_ITER_COMPLETED)
2675 				goto done;
2676 			err = NULL;
2677 			done = 1;
2678 		} else if (a->commits_needed > 0 && !a->load_all)
2679 			a->commits_needed--;
2680 
2681 		errcode = pthread_mutex_lock(&tog_mutex);
2682 		if (errcode) {
2683 			err = got_error_set_errno(errcode,
2684 			    "pthread_mutex_lock");
2685 			goto done;
2686 		} else if (*a->quit)
2687 			done = 1;
2688 		else if (*a->first_displayed_entry == NULL) {
2689 			*a->first_displayed_entry =
2690 			    TAILQ_FIRST(&a->commits->head);
2691 			*a->selected_entry = *a->first_displayed_entry;
2692 		}
2693 
2694 		errcode = pthread_cond_signal(&a->commit_loaded);
2695 		if (errcode) {
2696 			err = got_error_set_errno(errcode,
2697 			    "pthread_cond_signal");
2698 			pthread_mutex_unlock(&tog_mutex);
2699 			goto done;
2700 		}
2701 
2702 		if (done)
2703 			a->commits_needed = 0;
2704 		else {
2705 			if (a->commits_needed == 0 && !a->load_all) {
2706 				errcode = pthread_cond_wait(&a->need_commits,
2707 				    &tog_mutex);
2708 				if (errcode) {
2709 					err = got_error_set_errno(errcode,
2710 					    "pthread_cond_wait");
2711 					pthread_mutex_unlock(&tog_mutex);
2712 					goto done;
2713 				}
2714 				if (*a->quit)
2715 					done = 1;
2716 			}
2717 		}
2718 	}
2719 	a->log_complete = 1;
2720 	errcode = pthread_mutex_unlock(&tog_mutex);
2721 	if (errcode)
2722 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2723 done:
2724 	if (err) {
2725 		tog_thread_error = 1;
2726 		pthread_cond_signal(&a->commit_loaded);
2727 	}
2728 	return (void *)err;
2729 }
2730 
2731 static const struct got_error *
2732 stop_log_thread(struct tog_log_view_state *s)
2733 {
2734 	const struct got_error *err = NULL, *thread_err = NULL;
2735 	int errcode;
2736 
2737 	if (s->thread) {
2738 		s->quit = 1;
2739 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2740 		if (errcode)
2741 			return got_error_set_errno(errcode,
2742 			    "pthread_cond_signal");
2743 		errcode = pthread_mutex_unlock(&tog_mutex);
2744 		if (errcode)
2745 			return got_error_set_errno(errcode,
2746 			    "pthread_mutex_unlock");
2747 		errcode = pthread_join(s->thread, (void **)&thread_err);
2748 		if (errcode)
2749 			return got_error_set_errno(errcode, "pthread_join");
2750 		errcode = pthread_mutex_lock(&tog_mutex);
2751 		if (errcode)
2752 			return got_error_set_errno(errcode,
2753 			    "pthread_mutex_lock");
2754 		s->thread = 0; //NULL;
2755 	}
2756 
2757 	if (s->thread_args.repo) {
2758 		err = got_repo_close(s->thread_args.repo);
2759 		s->thread_args.repo = NULL;
2760 	}
2761 
2762 	if (s->thread_args.pack_fds) {
2763 		const struct got_error *pack_err =
2764 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2765 		if (err == NULL)
2766 			err = pack_err;
2767 		s->thread_args.pack_fds = NULL;
2768 	}
2769 
2770 	if (s->thread_args.graph) {
2771 		got_commit_graph_close(s->thread_args.graph);
2772 		s->thread_args.graph = NULL;
2773 	}
2774 
2775 	return err ? err : thread_err;
2776 }
2777 
2778 static const struct got_error *
2779 close_log_view(struct tog_view *view)
2780 {
2781 	const struct got_error *err = NULL;
2782 	struct tog_log_view_state *s = &view->state.log;
2783 	int errcode;
2784 
2785 	err = stop_log_thread(s);
2786 
2787 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2788 	if (errcode && err == NULL)
2789 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2790 
2791 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2792 	if (errcode && err == NULL)
2793 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2794 
2795 	free_commits(&s->commits);
2796 	free(s->in_repo_path);
2797 	s->in_repo_path = NULL;
2798 	free(s->start_id);
2799 	s->start_id = NULL;
2800 	free(s->head_ref_name);
2801 	s->head_ref_name = NULL;
2802 	return err;
2803 }
2804 
2805 static const struct got_error *
2806 search_start_log_view(struct tog_view *view)
2807 {
2808 	struct tog_log_view_state *s = &view->state.log;
2809 
2810 	s->matched_entry = NULL;
2811 	s->search_entry = NULL;
2812 	return NULL;
2813 }
2814 
2815 static const struct got_error *
2816 search_next_log_view(struct tog_view *view)
2817 {
2818 	const struct got_error *err = NULL;
2819 	struct tog_log_view_state *s = &view->state.log;
2820 	struct commit_queue_entry *entry;
2821 
2822 	/* Display progress update in log view. */
2823 	show_log_view(view);
2824 	update_panels();
2825 	doupdate();
2826 
2827 	if (s->search_entry) {
2828 		int errcode, ch;
2829 		errcode = pthread_mutex_unlock(&tog_mutex);
2830 		if (errcode)
2831 			return got_error_set_errno(errcode,
2832 			    "pthread_mutex_unlock");
2833 		ch = wgetch(view->window);
2834 		errcode = pthread_mutex_lock(&tog_mutex);
2835 		if (errcode)
2836 			return got_error_set_errno(errcode,
2837 			    "pthread_mutex_lock");
2838 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2839 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2840 			return NULL;
2841 		}
2842 		if (view->searching == TOG_SEARCH_FORWARD)
2843 			entry = TAILQ_NEXT(s->search_entry, entry);
2844 		else
2845 			entry = TAILQ_PREV(s->search_entry,
2846 			    commit_queue_head, entry);
2847 	} else if (s->matched_entry) {
2848 		int matched_idx = s->matched_entry->idx;
2849 		int selected_idx = s->selected_entry->idx;
2850 
2851 		/*
2852 		 * If the user has moved the cursor after we hit a match,
2853 		 * the position from where we should continue searching
2854 		 * might have changed.
2855 		 */
2856 		if (view->searching == TOG_SEARCH_FORWARD) {
2857 			if (matched_idx > selected_idx)
2858 				entry = TAILQ_NEXT(s->selected_entry, entry);
2859 			else
2860 				entry = TAILQ_NEXT(s->matched_entry, entry);
2861 		} else {
2862 			if (matched_idx < selected_idx)
2863 				entry = TAILQ_PREV(s->selected_entry,
2864 						commit_queue_head, entry);
2865 			else
2866 				entry = TAILQ_PREV(s->matched_entry,
2867 						commit_queue_head, entry);
2868 		}
2869 	} else {
2870 		entry = s->selected_entry;
2871 	}
2872 
2873 	while (1) {
2874 		int have_match = 0;
2875 
2876 		if (entry == NULL) {
2877 			if (s->thread_args.log_complete ||
2878 			    view->searching == TOG_SEARCH_BACKWARD) {
2879 				view->search_next_done =
2880 				    (s->matched_entry == NULL ?
2881 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2882 				s->search_entry = NULL;
2883 				return NULL;
2884 			}
2885 			/*
2886 			 * Poke the log thread for more commits and return,
2887 			 * allowing the main loop to make progress. Search
2888 			 * will resume at s->search_entry once we come back.
2889 			 */
2890 			s->thread_args.commits_needed++;
2891 			return trigger_log_thread(view, 0);
2892 		}
2893 
2894 		err = match_commit(&have_match, entry->id, entry->commit,
2895 		    &view->regex);
2896 		if (err)
2897 			break;
2898 		if (have_match) {
2899 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2900 			s->matched_entry = entry;
2901 			break;
2902 		}
2903 
2904 		s->search_entry = entry;
2905 		if (view->searching == TOG_SEARCH_FORWARD)
2906 			entry = TAILQ_NEXT(entry, entry);
2907 		else
2908 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2909 	}
2910 
2911 	if (s->matched_entry) {
2912 		int cur = s->selected_entry->idx;
2913 		while (cur < s->matched_entry->idx) {
2914 			err = input_log_view(NULL, view, KEY_DOWN);
2915 			if (err)
2916 				return err;
2917 			cur++;
2918 		}
2919 		while (cur > s->matched_entry->idx) {
2920 			err = input_log_view(NULL, view, KEY_UP);
2921 			if (err)
2922 				return err;
2923 			cur--;
2924 		}
2925 	}
2926 
2927 	s->search_entry = NULL;
2928 
2929 	return NULL;
2930 }
2931 
2932 static const struct got_error *
2933 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2934     struct got_repository *repo, const char *head_ref_name,
2935     const char *in_repo_path, int log_branches)
2936 {
2937 	const struct got_error *err = NULL;
2938 	struct tog_log_view_state *s = &view->state.log;
2939 	struct got_repository *thread_repo = NULL;
2940 	struct got_commit_graph *thread_graph = NULL;
2941 	int errcode;
2942 
2943 	if (in_repo_path != s->in_repo_path) {
2944 		free(s->in_repo_path);
2945 		s->in_repo_path = strdup(in_repo_path);
2946 		if (s->in_repo_path == NULL)
2947 			return got_error_from_errno("strdup");
2948 	}
2949 
2950 	/* The commit queue only contains commits being displayed. */
2951 	TAILQ_INIT(&s->commits.head);
2952 	s->commits.ncommits = 0;
2953 
2954 	s->repo = repo;
2955 	if (head_ref_name) {
2956 		s->head_ref_name = strdup(head_ref_name);
2957 		if (s->head_ref_name == NULL) {
2958 			err = got_error_from_errno("strdup");
2959 			goto done;
2960 		}
2961 	}
2962 	s->start_id = got_object_id_dup(start_id);
2963 	if (s->start_id == NULL) {
2964 		err = got_error_from_errno("got_object_id_dup");
2965 		goto done;
2966 	}
2967 	s->log_branches = log_branches;
2968 
2969 	STAILQ_INIT(&s->colors);
2970 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2971 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2972 		    get_color_value("TOG_COLOR_COMMIT"));
2973 		if (err)
2974 			goto done;
2975 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2976 		    get_color_value("TOG_COLOR_AUTHOR"));
2977 		if (err) {
2978 			free_colors(&s->colors);
2979 			goto done;
2980 		}
2981 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2982 		    get_color_value("TOG_COLOR_DATE"));
2983 		if (err) {
2984 			free_colors(&s->colors);
2985 			goto done;
2986 		}
2987 	}
2988 
2989 	view->show = show_log_view;
2990 	view->input = input_log_view;
2991 	view->close = close_log_view;
2992 	view->search_start = search_start_log_view;
2993 	view->search_next = search_next_log_view;
2994 
2995 	if (s->thread_args.pack_fds == NULL) {
2996 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2997 		if (err)
2998 			goto done;
2999 	}
3000 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3001 	    s->thread_args.pack_fds);
3002 	if (err)
3003 		goto done;
3004 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3005 	    !s->log_branches);
3006 	if (err)
3007 		goto done;
3008 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3009 	    s->repo, NULL, NULL);
3010 	if (err)
3011 		goto done;
3012 
3013 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3014 	if (errcode) {
3015 		err = got_error_set_errno(errcode, "pthread_cond_init");
3016 		goto done;
3017 	}
3018 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3019 	if (errcode) {
3020 		err = got_error_set_errno(errcode, "pthread_cond_init");
3021 		goto done;
3022 	}
3023 
3024 	s->thread_args.commits_needed = view->nlines;
3025 	s->thread_args.graph = thread_graph;
3026 	s->thread_args.commits = &s->commits;
3027 	s->thread_args.in_repo_path = s->in_repo_path;
3028 	s->thread_args.start_id = s->start_id;
3029 	s->thread_args.repo = thread_repo;
3030 	s->thread_args.log_complete = 0;
3031 	s->thread_args.quit = &s->quit;
3032 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3033 	s->thread_args.selected_entry = &s->selected_entry;
3034 	s->thread_args.searching = &view->searching;
3035 	s->thread_args.search_next_done = &view->search_next_done;
3036 	s->thread_args.regex = &view->regex;
3037 done:
3038 	if (err)
3039 		close_log_view(view);
3040 	return err;
3041 }
3042 
3043 static const struct got_error *
3044 show_log_view(struct tog_view *view)
3045 {
3046 	const struct got_error *err;
3047 	struct tog_log_view_state *s = &view->state.log;
3048 
3049 	if (s->thread == 0) { //NULL) {
3050 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3051 		    &s->thread_args);
3052 		if (errcode)
3053 			return got_error_set_errno(errcode, "pthread_create");
3054 		if (s->thread_args.commits_needed > 0) {
3055 			err = trigger_log_thread(view, 1);
3056 			if (err)
3057 				return err;
3058 		}
3059 	}
3060 
3061 	return draw_commits(view);
3062 }
3063 
3064 static void
3065 log_move_cursor_up(struct tog_view *view, int page, int home)
3066 {
3067 	struct tog_log_view_state *s = &view->state.log;
3068 
3069 	if (s->selected_entry->idx == 0)
3070 		view->count = 0;
3071 	if (s->first_displayed_entry == NULL)
3072 		return;
3073 
3074 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3075 	    || home)
3076 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3077 
3078 	if (!page && !home && s->selected > 0)
3079 		--s->selected;
3080 	else
3081 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3082 
3083 	select_commit(s);
3084 	return;
3085 }
3086 
3087 static const struct got_error *
3088 log_move_cursor_down(struct tog_view *view, int page)
3089 {
3090 	struct tog_log_view_state	*s = &view->state.log;
3091 	struct commit_queue_entry	*first;
3092 	const struct got_error		*err = NULL;
3093 
3094 	first = s->first_displayed_entry;
3095 	if (first == NULL) {
3096 		view->count = 0;
3097 		return NULL;
3098 	}
3099 
3100 	if (s->thread_args.log_complete &&
3101 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3102 		return NULL;
3103 
3104 	if (!page) {
3105 		int eos = view->nlines - 2;
3106 
3107 		if (view_is_hsplit_top(view))
3108 			--eos;  /* border consumes the last line */
3109 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3110 			++s->selected;
3111 		else
3112 			err = log_scroll_down(view, 1);
3113 	} else if (s->thread_args.load_all) {
3114 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3115 			s->selected += MIN(s->last_displayed_entry->idx -
3116 			    s->selected_entry->idx, page + 1);
3117 		else
3118 			err = log_scroll_down(view, MIN(page,
3119 			    s->commits.ncommits - s->selected_entry->idx - 1));
3120 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3121 	} else {
3122 		err = log_scroll_down(view, page);
3123 		if (err)
3124 			return err;
3125 		if (first == s->first_displayed_entry && s->selected <
3126 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3127 			s->selected = MIN(s->commits.ncommits - 1, page);
3128 		}
3129 	}
3130 	if (err)
3131 		return err;
3132 
3133 	/*
3134 	 * We might necessarily overshoot in horizontal
3135 	 * splits; if so, select the last displayed commit.
3136 	 */
3137 	s->selected = MIN(s->selected,
3138 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3139 
3140 	select_commit(s);
3141 
3142 	if (s->thread_args.log_complete &&
3143 	    s->selected_entry->idx == s->commits.ncommits - 1)
3144 		view->count = 0;
3145 
3146 	return NULL;
3147 }
3148 
3149 static void
3150 view_get_split(struct tog_view *view, int *y, int *x)
3151 {
3152 	*x = 0;
3153 	*y = 0;
3154 
3155 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3156 		if (view->child && view->child->resized_y)
3157 			*y = view->child->resized_y;
3158 		else if (view->resized_y)
3159 			*y = view->resized_y;
3160 		else
3161 			*y = view_split_begin_y(view->lines);
3162 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3163 		if (view->child && view->child->resized_x)
3164 			*x = view->child->resized_x;
3165 		else if (view->resized_x)
3166 			*x = view->resized_x;
3167 		else
3168 			*x = view_split_begin_x(view->begin_x);
3169 	}
3170 }
3171 
3172 /* Split view horizontally at y and offset view->state->selected line. */
3173 static const struct got_error *
3174 view_init_hsplit(struct tog_view *view, int y)
3175 {
3176 	const struct got_error *err = NULL;
3177 
3178 	view->nlines = y;
3179 	view->ncols = COLS;
3180 	err = view_resize(view);
3181 	if (err)
3182 		return err;
3183 
3184 	err = offset_selection_down(view);
3185 
3186 	return err;
3187 }
3188 
3189 static const struct got_error *
3190 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3191 {
3192 	const struct got_error *err = NULL;
3193 	struct tog_log_view_state *s = &view->state.log;
3194 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3195 	struct tog_view *ref_view = NULL;
3196 	struct commit_queue_entry *entry;
3197 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3198 
3199 	if (s->thread_args.load_all) {
3200 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3201 			s->thread_args.load_all = 0;
3202 		else if (s->thread_args.log_complete) {
3203 			err = log_move_cursor_down(view, s->commits.ncommits);
3204 			s->thread_args.load_all = 0;
3205 		}
3206 		return err;
3207 	}
3208 
3209 	eos = nscroll = view->nlines - 1;
3210 	if (view_is_hsplit_top(view))
3211 		--eos;  /* border */
3212 
3213 	switch (ch) {
3214 	case 'q':
3215 		s->quit = 1;
3216 		break;
3217 	case '0':
3218 		view->x = 0;
3219 		break;
3220 	case '$':
3221 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3222 		view->count = 0;
3223 		break;
3224 	case KEY_RIGHT:
3225 	case 'l':
3226 		if (view->x + view->ncols / 2 < view->maxx)
3227 			view->x += 2;  /* move two columns right */
3228 		else
3229 			view->count = 0;
3230 		break;
3231 	case KEY_LEFT:
3232 	case 'h':
3233 		view->x -= MIN(view->x, 2);  /* move two columns back */
3234 		if (view->x <= 0)
3235 			view->count = 0;
3236 		break;
3237 	case 'k':
3238 	case KEY_UP:
3239 	case '<':
3240 	case ',':
3241 	case CTRL('p'):
3242 		log_move_cursor_up(view, 0, 0);
3243 		break;
3244 	case 'g':
3245 	case KEY_HOME:
3246 		log_move_cursor_up(view, 0, 1);
3247 		view->count = 0;
3248 		break;
3249 	case CTRL('u'):
3250 	case 'u':
3251 		nscroll /= 2;
3252 		/* FALL THROUGH */
3253 	case KEY_PPAGE:
3254 	case CTRL('b'):
3255 	case 'b':
3256 		log_move_cursor_up(view, nscroll, 0);
3257 		break;
3258 	case 'j':
3259 	case KEY_DOWN:
3260 	case '>':
3261 	case '.':
3262 	case CTRL('n'):
3263 		err = log_move_cursor_down(view, 0);
3264 		break;
3265 	case 'G':
3266 	case KEY_END: {
3267 		/* We don't know yet how many commits, so we're forced to
3268 		 * traverse them all. */
3269 		view->count = 0;
3270 		if (!s->thread_args.log_complete) {
3271 			s->thread_args.load_all = 1;
3272 			return trigger_log_thread(view, 0);
3273 		}
3274 
3275 		s->selected = 0;
3276 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3277 		for (n = 0; n < eos; n++) {
3278 			if (entry == NULL)
3279 				break;
3280 			s->first_displayed_entry = entry;
3281 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3282 		}
3283 		if (n > 0)
3284 			s->selected = n - 1;
3285 		select_commit(s);
3286 		break;
3287 	}
3288 	case CTRL('d'):
3289 	case 'd':
3290 		nscroll /= 2;
3291 		/* FALL THROUGH */
3292 	case KEY_NPAGE:
3293 	case CTRL('f'):
3294 	case 'f':
3295 	case ' ':
3296 		err = log_move_cursor_down(view, nscroll);
3297 		break;
3298 	case KEY_RESIZE:
3299 		if (s->selected > view->nlines - 2)
3300 			s->selected = view->nlines - 2;
3301 		if (s->selected > s->commits.ncommits - 1)
3302 			s->selected = s->commits.ncommits - 1;
3303 		select_commit(s);
3304 		if (s->commits.ncommits < view->nlines - 1 &&
3305 		    !s->thread_args.log_complete) {
3306 			s->thread_args.commits_needed += (view->nlines - 1) -
3307 			    s->commits.ncommits;
3308 			err = trigger_log_thread(view, 1);
3309 		}
3310 		break;
3311 	case KEY_ENTER:
3312 	case '\r':
3313 		view->count = 0;
3314 		if (s->selected_entry == NULL)
3315 			break;
3316 
3317 		/* get dimensions--don't split till initialisation succeeds */
3318 		if (view_is_parent_view(view))
3319 			view_get_split(view, &begin_y, &begin_x);
3320 
3321 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3322 		    s->selected_entry->commit, s->selected_entry->id,
3323 		    view, s->repo);
3324 		if (err)
3325 			break;
3326 
3327 		if (view_is_parent_view(view) &&
3328 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3329 			err = view_init_hsplit(view, begin_y);
3330 			if (err)
3331 				break;
3332 		}
3333 
3334 		view->focussed = 0;
3335 		diff_view->focussed = 1;
3336 		diff_view->mode = view->mode;
3337 		diff_view->nlines = view->lines - begin_y;
3338 
3339 		if (view_is_parent_view(view)) {
3340 			view_transfer_size(diff_view, view);
3341 			err = view_close_child(view);
3342 			if (err)
3343 				return err;
3344 			err = view_set_child(view, diff_view);
3345 			if (err)
3346 				return err;
3347 			view->focus_child = 1;
3348 		} else
3349 			*new_view = diff_view;
3350 		break;
3351 	case 't':
3352 		view->count = 0;
3353 		if (s->selected_entry == NULL)
3354 			break;
3355 		if (view_is_parent_view(view))
3356 			view_get_split(view, &begin_y, &begin_x);
3357 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3358 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3359 		    s->repo);
3360 		if (err)
3361 			break;
3362 		if (view_is_parent_view(view) &&
3363 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3364 			err = view_init_hsplit(view, begin_y);
3365 			if (err)
3366 				break;
3367 		}
3368 		view->focussed = 0;
3369 		tree_view->focussed = 1;
3370 		tree_view->mode = view->mode;
3371 		tree_view->nlines = view->lines - begin_y;
3372 		if (view_is_parent_view(view)) {
3373 			view_transfer_size(tree_view, view);
3374 			err = view_close_child(view);
3375 			if (err)
3376 				return err;
3377 			err = view_set_child(view, tree_view);
3378 			if (err)
3379 				return err;
3380 			view->focus_child = 1;
3381 		} else
3382 			*new_view = tree_view;
3383 		break;
3384 	case KEY_BACKSPACE:
3385 	case CTRL('l'):
3386 	case 'B':
3387 		view->count = 0;
3388 		if (ch == KEY_BACKSPACE &&
3389 		    got_path_is_root_dir(s->in_repo_path))
3390 			break;
3391 		err = stop_log_thread(s);
3392 		if (err)
3393 			return err;
3394 		if (ch == KEY_BACKSPACE) {
3395 			char *parent_path;
3396 			err = got_path_dirname(&parent_path, s->in_repo_path);
3397 			if (err)
3398 				return err;
3399 			free(s->in_repo_path);
3400 			s->in_repo_path = parent_path;
3401 			s->thread_args.in_repo_path = s->in_repo_path;
3402 		} else if (ch == CTRL('l')) {
3403 			struct got_object_id *start_id;
3404 			err = got_repo_match_object_id(&start_id, NULL,
3405 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3406 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3407 			if (err)
3408 				return err;
3409 			free(s->start_id);
3410 			s->start_id = start_id;
3411 			s->thread_args.start_id = s->start_id;
3412 		} else /* 'B' */
3413 			s->log_branches = !s->log_branches;
3414 
3415 		if (s->thread_args.pack_fds == NULL) {
3416 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3417 			if (err)
3418 				return err;
3419 		}
3420 		err = got_repo_open(&s->thread_args.repo,
3421 		    got_repo_get_path(s->repo), NULL,
3422 		    s->thread_args.pack_fds);
3423 		if (err)
3424 			return err;
3425 		tog_free_refs();
3426 		err = tog_load_refs(s->repo, 0);
3427 		if (err)
3428 			return err;
3429 		err = got_commit_graph_open(&s->thread_args.graph,
3430 		    s->in_repo_path, !s->log_branches);
3431 		if (err)
3432 			return err;
3433 		err = got_commit_graph_iter_start(s->thread_args.graph,
3434 		    s->start_id, s->repo, NULL, NULL);
3435 		if (err)
3436 			return err;
3437 		free_commits(&s->commits);
3438 		s->first_displayed_entry = NULL;
3439 		s->last_displayed_entry = NULL;
3440 		s->selected_entry = NULL;
3441 		s->selected = 0;
3442 		s->thread_args.log_complete = 0;
3443 		s->quit = 0;
3444 		s->thread_args.commits_needed = view->lines;
3445 		s->matched_entry = NULL;
3446 		s->search_entry = NULL;
3447 		break;
3448 	case 'r':
3449 		view->count = 0;
3450 		if (view_is_parent_view(view))
3451 			view_get_split(view, &begin_y, &begin_x);
3452 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3453 		if (ref_view == NULL)
3454 			return got_error_from_errno("view_open");
3455 		err = open_ref_view(ref_view, s->repo);
3456 		if (err) {
3457 			view_close(ref_view);
3458 			return err;
3459 		}
3460 		if (view_is_parent_view(view) &&
3461 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3462 			err = view_init_hsplit(view, begin_y);
3463 			if (err)
3464 				break;
3465 		}
3466 		view->focussed = 0;
3467 		ref_view->focussed = 1;
3468 		ref_view->mode = view->mode;
3469 		ref_view->nlines = view->lines - begin_y;
3470 		if (view_is_parent_view(view)) {
3471 			view_transfer_size(ref_view, view);
3472 			err = view_close_child(view);
3473 			if (err)
3474 				return err;
3475 			err = view_set_child(view, ref_view);
3476 			if (err)
3477 				return err;
3478 			view->focus_child = 1;
3479 		} else
3480 			*new_view = ref_view;
3481 		break;
3482 	default:
3483 		view->count = 0;
3484 		break;
3485 	}
3486 
3487 	return err;
3488 }
3489 
3490 static const struct got_error *
3491 apply_unveil(const char *repo_path, const char *worktree_path)
3492 {
3493 	const struct got_error *error;
3494 
3495 #ifdef PROFILE
3496 	if (unveil("gmon.out", "rwc") != 0)
3497 		return got_error_from_errno2("unveil", "gmon.out");
3498 #endif
3499 	if (repo_path && unveil(repo_path, "r") != 0)
3500 		return got_error_from_errno2("unveil", repo_path);
3501 
3502 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3503 		return got_error_from_errno2("unveil", worktree_path);
3504 
3505 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3506 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3507 
3508 	error = got_privsep_unveil_exec_helpers();
3509 	if (error != NULL)
3510 		return error;
3511 
3512 	if (unveil(NULL, NULL) != 0)
3513 		return got_error_from_errno("unveil");
3514 
3515 	return NULL;
3516 }
3517 
3518 static void
3519 init_curses(void)
3520 {
3521 	/*
3522 	 * Override default signal handlers before starting ncurses.
3523 	 * This should prevent ncurses from installing its own
3524 	 * broken cleanup() signal handler.
3525 	 */
3526 	signal(SIGWINCH, tog_sigwinch);
3527 	signal(SIGPIPE, tog_sigpipe);
3528 	signal(SIGCONT, tog_sigcont);
3529 	signal(SIGINT, tog_sigint);
3530 	signal(SIGTERM, tog_sigterm);
3531 
3532 	initscr();
3533 	cbreak();
3534 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3535 	noecho();
3536 	nonl();
3537 	intrflush(stdscr, FALSE);
3538 	keypad(stdscr, TRUE);
3539 	curs_set(0);
3540 	if (getenv("TOG_COLORS") != NULL) {
3541 		start_color();
3542 		use_default_colors();
3543 	}
3544 }
3545 
3546 static const struct got_error *
3547 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3548     struct got_repository *repo, struct got_worktree *worktree)
3549 {
3550 	const struct got_error *err = NULL;
3551 
3552 	if (argc == 0) {
3553 		*in_repo_path = strdup("/");
3554 		if (*in_repo_path == NULL)
3555 			return got_error_from_errno("strdup");
3556 		return NULL;
3557 	}
3558 
3559 	if (worktree) {
3560 		const char *prefix = got_worktree_get_path_prefix(worktree);
3561 		char *p;
3562 
3563 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3564 		if (err)
3565 			return err;
3566 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3567 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3568 		    p) == -1) {
3569 			err = got_error_from_errno("asprintf");
3570 			*in_repo_path = NULL;
3571 		}
3572 		free(p);
3573 	} else
3574 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3575 
3576 	return err;
3577 }
3578 
3579 static const struct got_error *
3580 cmd_log(int argc, char *argv[])
3581 {
3582 	const struct got_error *error;
3583 	struct got_repository *repo = NULL;
3584 	struct got_worktree *worktree = NULL;
3585 	struct got_object_id *start_id = NULL;
3586 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3587 	char *start_commit = NULL, *label = NULL;
3588 	struct got_reference *ref = NULL;
3589 	const char *head_ref_name = NULL;
3590 	int ch, log_branches = 0;
3591 	struct tog_view *view;
3592 	int *pack_fds = NULL;
3593 
3594 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3595 		switch (ch) {
3596 		case 'b':
3597 			log_branches = 1;
3598 			break;
3599 		case 'c':
3600 			start_commit = optarg;
3601 			break;
3602 		case 'r':
3603 			repo_path = realpath(optarg, NULL);
3604 			if (repo_path == NULL)
3605 				return got_error_from_errno2("realpath",
3606 				    optarg);
3607 			break;
3608 		default:
3609 			usage_log();
3610 			/* NOTREACHED */
3611 		}
3612 	}
3613 
3614 	argc -= optind;
3615 	argv += optind;
3616 
3617 	if (argc > 1)
3618 		usage_log();
3619 
3620 	error = got_repo_pack_fds_open(&pack_fds);
3621 	if (error != NULL)
3622 		goto done;
3623 
3624 	if (repo_path == NULL) {
3625 		cwd = getcwd(NULL, 0);
3626 		if (cwd == NULL)
3627 			return got_error_from_errno("getcwd");
3628 		error = got_worktree_open(&worktree, cwd);
3629 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3630 			goto done;
3631 		if (worktree)
3632 			repo_path =
3633 			    strdup(got_worktree_get_repo_path(worktree));
3634 		else
3635 			repo_path = strdup(cwd);
3636 		if (repo_path == NULL) {
3637 			error = got_error_from_errno("strdup");
3638 			goto done;
3639 		}
3640 	}
3641 
3642 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3643 	if (error != NULL)
3644 		goto done;
3645 
3646 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3647 	    repo, worktree);
3648 	if (error)
3649 		goto done;
3650 
3651 	init_curses();
3652 
3653 	error = apply_unveil(got_repo_get_path(repo),
3654 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3655 	if (error)
3656 		goto done;
3657 
3658 	/* already loaded by tog_log_with_path()? */
3659 	if (TAILQ_EMPTY(&tog_refs)) {
3660 		error = tog_load_refs(repo, 0);
3661 		if (error)
3662 			goto done;
3663 	}
3664 
3665 	if (start_commit == NULL) {
3666 		error = got_repo_match_object_id(&start_id, &label,
3667 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3668 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3669 		if (error)
3670 			goto done;
3671 		head_ref_name = label;
3672 	} else {
3673 		error = got_ref_open(&ref, repo, start_commit, 0);
3674 		if (error == NULL)
3675 			head_ref_name = got_ref_get_name(ref);
3676 		else if (error->code != GOT_ERR_NOT_REF)
3677 			goto done;
3678 		error = got_repo_match_object_id(&start_id, NULL,
3679 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3680 		if (error)
3681 			goto done;
3682 	}
3683 
3684 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3685 	if (view == NULL) {
3686 		error = got_error_from_errno("view_open");
3687 		goto done;
3688 	}
3689 	error = open_log_view(view, start_id, repo, head_ref_name,
3690 	    in_repo_path, log_branches);
3691 	if (error)
3692 		goto done;
3693 	if (worktree) {
3694 		/* Release work tree lock. */
3695 		got_worktree_close(worktree);
3696 		worktree = NULL;
3697 	}
3698 	error = view_loop(view);
3699 done:
3700 	free(in_repo_path);
3701 	free(repo_path);
3702 	free(cwd);
3703 	free(start_id);
3704 	free(label);
3705 	if (ref)
3706 		got_ref_close(ref);
3707 	if (repo) {
3708 		const struct got_error *close_err = got_repo_close(repo);
3709 		if (error == NULL)
3710 			error = close_err;
3711 	}
3712 	if (worktree)
3713 		got_worktree_close(worktree);
3714 	if (pack_fds) {
3715 		const struct got_error *pack_err =
3716 		    got_repo_pack_fds_close(pack_fds);
3717 		if (error == NULL)
3718 			error = pack_err;
3719 	}
3720 	tog_free_refs();
3721 	return error;
3722 }
3723 
3724 __dead static void
3725 usage_diff(void)
3726 {
3727 	endwin();
3728 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3729 	    "[-w] object1 object2\n", getprogname());
3730 	exit(1);
3731 }
3732 
3733 static int
3734 match_line(const char *line, regex_t *regex, size_t nmatch,
3735     regmatch_t *regmatch)
3736 {
3737 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3738 }
3739 
3740 static struct tog_color *
3741 match_color(struct tog_colors *colors, const char *line)
3742 {
3743 	struct tog_color *tc = NULL;
3744 
3745 	STAILQ_FOREACH(tc, colors, entry) {
3746 		if (match_line(line, &tc->regex, 0, NULL))
3747 			return tc;
3748 	}
3749 
3750 	return NULL;
3751 }
3752 
3753 static const struct got_error *
3754 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3755     WINDOW *window, int skipcol, regmatch_t *regmatch)
3756 {
3757 	const struct got_error *err = NULL;
3758 	char *exstr = NULL;
3759 	wchar_t *wline = NULL;
3760 	int rme, rms, n, width, scrollx;
3761 	int width0 = 0, width1 = 0, width2 = 0;
3762 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3763 
3764 	*wtotal = 0;
3765 
3766 	rms = regmatch->rm_so;
3767 	rme = regmatch->rm_eo;
3768 
3769 	err = expand_tab(&exstr, line);
3770 	if (err)
3771 		return err;
3772 
3773 	/* Split the line into 3 segments, according to match offsets. */
3774 	seg0 = strndup(exstr, rms);
3775 	if (seg0 == NULL) {
3776 		err = got_error_from_errno("strndup");
3777 		goto done;
3778 	}
3779 	seg1 = strndup(exstr + rms, rme - rms);
3780 	if (seg1 == NULL) {
3781 		err = got_error_from_errno("strndup");
3782 		goto done;
3783 	}
3784 	seg2 = strdup(exstr + rme);
3785 	if (seg2 == NULL) {
3786 		err = got_error_from_errno("strndup");
3787 		goto done;
3788 	}
3789 
3790 	/* draw up to matched token if we haven't scrolled past it */
3791 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3792 	    col_tab_align, 1);
3793 	if (err)
3794 		goto done;
3795 	n = MAX(width0 - skipcol, 0);
3796 	if (n) {
3797 		free(wline);
3798 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3799 		    wlimit, col_tab_align, 1);
3800 		if (err)
3801 			goto done;
3802 		waddwstr(window, &wline[scrollx]);
3803 		wlimit -= width;
3804 		*wtotal += width;
3805 	}
3806 
3807 	if (wlimit > 0) {
3808 		int i = 0, w = 0;
3809 		size_t wlen;
3810 
3811 		free(wline);
3812 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3813 		    col_tab_align, 1);
3814 		if (err)
3815 			goto done;
3816 		wlen = wcslen(wline);
3817 		while (i < wlen) {
3818 			width = wcwidth(wline[i]);
3819 			if (width == -1) {
3820 				/* should not happen, tabs are expanded */
3821 				err = got_error(GOT_ERR_RANGE);
3822 				goto done;
3823 			}
3824 			if (width0 + w + width > skipcol)
3825 				break;
3826 			w += width;
3827 			i++;
3828 		}
3829 		/* draw (visible part of) matched token (if scrolled into it) */
3830 		if (width1 - w > 0) {
3831 			wattron(window, A_STANDOUT);
3832 			waddwstr(window, &wline[i]);
3833 			wattroff(window, A_STANDOUT);
3834 			wlimit -= (width1 - w);
3835 			*wtotal += (width1 - w);
3836 		}
3837 	}
3838 
3839 	if (wlimit > 0) {  /* draw rest of line */
3840 		free(wline);
3841 		if (skipcol > width0 + width1) {
3842 			err = format_line(&wline, &width2, &scrollx, seg2,
3843 			    skipcol - (width0 + width1), wlimit,
3844 			    col_tab_align, 1);
3845 			if (err)
3846 				goto done;
3847 			waddwstr(window, &wline[scrollx]);
3848 		} else {
3849 			err = format_line(&wline, &width2, NULL, seg2, 0,
3850 			    wlimit, col_tab_align, 1);
3851 			if (err)
3852 				goto done;
3853 			waddwstr(window, wline);
3854 		}
3855 		*wtotal += width2;
3856 	}
3857 done:
3858 	free(wline);
3859 	free(exstr);
3860 	free(seg0);
3861 	free(seg1);
3862 	free(seg2);
3863 	return err;
3864 }
3865 
3866 static const struct got_error *
3867 draw_file(struct tog_view *view, const char *header)
3868 {
3869 	struct tog_diff_view_state *s = &view->state.diff;
3870 	regmatch_t *regmatch = &view->regmatch;
3871 	const struct got_error *err;
3872 	int nprinted = 0;
3873 	char *line;
3874 	size_t linesize = 0;
3875 	ssize_t linelen;
3876 	struct tog_color *tc;
3877 	wchar_t *wline;
3878 	int width;
3879 	int max_lines = view->nlines;
3880 	int nlines = s->nlines;
3881 	off_t line_offset;
3882 
3883 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3884 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3885 		return got_error_from_errno("fseek");
3886 
3887 	werase(view->window);
3888 
3889 	if (header) {
3890 		if (asprintf(&line, "[%d/%d] %s",
3891 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3892 		    header) == -1)
3893 			return got_error_from_errno("asprintf");
3894 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3895 		    0, 0);
3896 		free(line);
3897 		if (err)
3898 			return err;
3899 
3900 		if (view_needs_focus_indication(view))
3901 			wstandout(view->window);
3902 		waddwstr(view->window, wline);
3903 		free(wline);
3904 		wline = NULL;
3905 		if (view_needs_focus_indication(view))
3906 			wstandend(view->window);
3907 		if (width <= view->ncols - 1)
3908 			waddch(view->window, '\n');
3909 
3910 		if (max_lines <= 1)
3911 			return NULL;
3912 		max_lines--;
3913 	}
3914 
3915 	s->eof = 0;
3916 	view->maxx = 0;
3917 	line = NULL;
3918 	while (max_lines > 0 && nprinted < max_lines) {
3919 		linelen = getline(&line, &linesize, s->f);
3920 		if (linelen == -1) {
3921 			if (feof(s->f)) {
3922 				s->eof = 1;
3923 				break;
3924 			}
3925 			free(line);
3926 			return got_ferror(s->f, GOT_ERR_IO);
3927 		}
3928 
3929 		/* Set view->maxx based on full line length. */
3930 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3931 		    view->x ? 1 : 0);
3932 		if (err) {
3933 			free(line);
3934 			return err;
3935 		}
3936 		view->maxx = MAX(view->maxx, width);
3937 		free(wline);
3938 		wline = NULL;
3939 
3940 		tc = match_color(&s->colors, line);
3941 		if (tc)
3942 			wattr_on(view->window,
3943 			    COLOR_PAIR(tc->colorpair), NULL);
3944 		if (s->first_displayed_line + nprinted == s->matched_line &&
3945 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3946 			err = add_matched_line(&width, line, view->ncols, 0,
3947 			    view->window, view->x, regmatch);
3948 			if (err) {
3949 				free(line);
3950 				return err;
3951 			}
3952 		} else {
3953 			int skip;
3954 			err = format_line(&wline, &width, &skip, line,
3955 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3956 			if (err) {
3957 				free(line);
3958 				return err;
3959 			}
3960 			waddwstr(view->window, &wline[skip]);
3961 			free(wline);
3962 			wline = NULL;
3963 		}
3964 		if (tc)
3965 			wattr_off(view->window,
3966 			    COLOR_PAIR(tc->colorpair), NULL);
3967 		if (width <= view->ncols - 1)
3968 			waddch(view->window, '\n');
3969 		nprinted++;
3970 	}
3971 	free(line);
3972 	if (nprinted >= 1)
3973 		s->last_displayed_line = s->first_displayed_line +
3974 		    (nprinted - 1);
3975 	else
3976 		s->last_displayed_line = s->first_displayed_line;
3977 
3978 	view_border(view);
3979 
3980 	if (s->eof) {
3981 		while (nprinted < view->nlines) {
3982 			waddch(view->window, '\n');
3983 			nprinted++;
3984 		}
3985 
3986 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3987 		    view->ncols, 0, 0);
3988 		if (err) {
3989 			return err;
3990 		}
3991 
3992 		wstandout(view->window);
3993 		waddwstr(view->window, wline);
3994 		free(wline);
3995 		wline = NULL;
3996 		wstandend(view->window);
3997 	}
3998 
3999 	return NULL;
4000 }
4001 
4002 static char *
4003 get_datestr(time_t *time, char *datebuf)
4004 {
4005 	struct tm mytm, *tm;
4006 	char *p, *s;
4007 
4008 	tm = gmtime_r(time, &mytm);
4009 	if (tm == NULL)
4010 		return NULL;
4011 	s = asctime_r(tm, datebuf);
4012 	if (s == NULL)
4013 		return NULL;
4014 	p = strchr(s, '\n');
4015 	if (p)
4016 		*p = '\0';
4017 	return s;
4018 }
4019 
4020 static const struct got_error *
4021 get_changed_paths(struct got_pathlist_head *paths,
4022     struct got_commit_object *commit, struct got_repository *repo)
4023 {
4024 	const struct got_error *err = NULL;
4025 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4026 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4027 	struct got_object_qid *qid;
4028 
4029 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4030 	if (qid != NULL) {
4031 		struct got_commit_object *pcommit;
4032 		err = got_object_open_as_commit(&pcommit, repo,
4033 		    &qid->id);
4034 		if (err)
4035 			return err;
4036 
4037 		tree_id1 = got_object_id_dup(
4038 		    got_object_commit_get_tree_id(pcommit));
4039 		if (tree_id1 == NULL) {
4040 			got_object_commit_close(pcommit);
4041 			return got_error_from_errno("got_object_id_dup");
4042 		}
4043 		got_object_commit_close(pcommit);
4044 
4045 	}
4046 
4047 	if (tree_id1) {
4048 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4049 		if (err)
4050 			goto done;
4051 	}
4052 
4053 	tree_id2 = got_object_commit_get_tree_id(commit);
4054 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4055 	if (err)
4056 		goto done;
4057 
4058 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4059 	    got_diff_tree_collect_changed_paths, paths, 0);
4060 done:
4061 	if (tree1)
4062 		got_object_tree_close(tree1);
4063 	if (tree2)
4064 		got_object_tree_close(tree2);
4065 	free(tree_id1);
4066 	return err;
4067 }
4068 
4069 static const struct got_error *
4070 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4071 {
4072 	off_t *p;
4073 
4074 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4075 	if (p == NULL)
4076 		return got_error_from_errno("reallocarray");
4077 	*line_offsets = p;
4078 	(*line_offsets)[*nlines] = off;
4079 	(*nlines)++;
4080 	return NULL;
4081 }
4082 
4083 static const struct got_error *
4084 write_commit_info(off_t **line_offsets, size_t *nlines,
4085     struct got_object_id *commit_id, struct got_reflist_head *refs,
4086     struct got_repository *repo, FILE *outfile)
4087 {
4088 	const struct got_error *err = NULL;
4089 	char datebuf[26], *datestr;
4090 	struct got_commit_object *commit;
4091 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4092 	time_t committer_time;
4093 	const char *author, *committer;
4094 	char *refs_str = NULL;
4095 	struct got_pathlist_head changed_paths;
4096 	struct got_pathlist_entry *pe;
4097 	off_t outoff = 0;
4098 	int n;
4099 
4100 	TAILQ_INIT(&changed_paths);
4101 
4102 	if (refs) {
4103 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4104 		if (err)
4105 			return err;
4106 	}
4107 
4108 	err = got_object_open_as_commit(&commit, repo, commit_id);
4109 	if (err)
4110 		return err;
4111 
4112 	err = got_object_id_str(&id_str, commit_id);
4113 	if (err) {
4114 		err = got_error_from_errno("got_object_id_str");
4115 		goto done;
4116 	}
4117 
4118 	err = add_line_offset(line_offsets, nlines, 0);
4119 	if (err)
4120 		goto done;
4121 
4122 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4123 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4124 	if (n < 0) {
4125 		err = got_error_from_errno("fprintf");
4126 		goto done;
4127 	}
4128 	outoff += n;
4129 	err = add_line_offset(line_offsets, nlines, outoff);
4130 	if (err)
4131 		goto done;
4132 
4133 	n = fprintf(outfile, "from: %s\n",
4134 	    got_object_commit_get_author(commit));
4135 	if (n < 0) {
4136 		err = got_error_from_errno("fprintf");
4137 		goto done;
4138 	}
4139 	outoff += n;
4140 	err = add_line_offset(line_offsets, nlines, outoff);
4141 	if (err)
4142 		goto done;
4143 
4144 	committer_time = got_object_commit_get_committer_time(commit);
4145 	datestr = get_datestr(&committer_time, datebuf);
4146 	if (datestr) {
4147 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4148 		if (n < 0) {
4149 			err = got_error_from_errno("fprintf");
4150 			goto done;
4151 		}
4152 		outoff += n;
4153 		err = add_line_offset(line_offsets, nlines, outoff);
4154 		if (err)
4155 			goto done;
4156 	}
4157 	author = got_object_commit_get_author(commit);
4158 	committer = got_object_commit_get_committer(commit);
4159 	if (strcmp(author, committer) != 0) {
4160 		n = fprintf(outfile, "via: %s\n", committer);
4161 		if (n < 0) {
4162 			err = got_error_from_errno("fprintf");
4163 			goto done;
4164 		}
4165 		outoff += n;
4166 		err = add_line_offset(line_offsets, nlines, outoff);
4167 		if (err)
4168 			goto done;
4169 	}
4170 	if (got_object_commit_get_nparents(commit) > 1) {
4171 		const struct got_object_id_queue *parent_ids;
4172 		struct got_object_qid *qid;
4173 		int pn = 1;
4174 		parent_ids = got_object_commit_get_parent_ids(commit);
4175 		STAILQ_FOREACH(qid, parent_ids, entry) {
4176 			err = got_object_id_str(&id_str, &qid->id);
4177 			if (err)
4178 				goto done;
4179 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4180 			if (n < 0) {
4181 				err = got_error_from_errno("fprintf");
4182 				goto done;
4183 			}
4184 			outoff += n;
4185 			err = add_line_offset(line_offsets, nlines, outoff);
4186 			if (err)
4187 				goto done;
4188 			free(id_str);
4189 			id_str = NULL;
4190 		}
4191 	}
4192 
4193 	err = got_object_commit_get_logmsg(&logmsg, commit);
4194 	if (err)
4195 		goto done;
4196 	s = logmsg;
4197 	while ((line = strsep(&s, "\n")) != NULL) {
4198 		n = fprintf(outfile, "%s\n", line);
4199 		if (n < 0) {
4200 			err = got_error_from_errno("fprintf");
4201 			goto done;
4202 		}
4203 		outoff += n;
4204 		err = add_line_offset(line_offsets, nlines, outoff);
4205 		if (err)
4206 			goto done;
4207 	}
4208 
4209 	err = get_changed_paths(&changed_paths, commit, repo);
4210 	if (err)
4211 		goto done;
4212 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4213 		struct got_diff_changed_path *cp = pe->data;
4214 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4215 		if (n < 0) {
4216 			err = got_error_from_errno("fprintf");
4217 			goto done;
4218 		}
4219 		outoff += n;
4220 		err = add_line_offset(line_offsets, nlines, outoff);
4221 		if (err)
4222 			goto done;
4223 		free((char *)pe->path);
4224 		free(pe->data);
4225 	}
4226 
4227 	fputc('\n', outfile);
4228 	outoff++;
4229 	err = add_line_offset(line_offsets, nlines, outoff);
4230 done:
4231 	got_pathlist_free(&changed_paths);
4232 	free(id_str);
4233 	free(logmsg);
4234 	free(refs_str);
4235 	got_object_commit_close(commit);
4236 	if (err) {
4237 		free(*line_offsets);
4238 		*line_offsets = NULL;
4239 		*nlines = 0;
4240 	}
4241 	return err;
4242 }
4243 
4244 static const struct got_error *
4245 create_diff(struct tog_diff_view_state *s)
4246 {
4247 	const struct got_error *err = NULL;
4248 	FILE *f = NULL;
4249 	int obj_type;
4250 
4251 	free(s->line_offsets);
4252 	s->line_offsets = malloc(sizeof(off_t));
4253 	if (s->line_offsets == NULL)
4254 		return got_error_from_errno("malloc");
4255 	s->nlines = 0;
4256 
4257 	f = got_opentemp();
4258 	if (f == NULL) {
4259 		err = got_error_from_errno("got_opentemp");
4260 		goto done;
4261 	}
4262 	if (s->f && fclose(s->f) == EOF) {
4263 		err = got_error_from_errno("fclose");
4264 		goto done;
4265 	}
4266 	s->f = f;
4267 
4268 	if (s->id1)
4269 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4270 	else
4271 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4272 	if (err)
4273 		goto done;
4274 
4275 	switch (obj_type) {
4276 	case GOT_OBJ_TYPE_BLOB:
4277 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4278 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4279 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4280 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4281 		break;
4282 	case GOT_OBJ_TYPE_TREE:
4283 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4284 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4285 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4286 		    s->force_text_diff, s->repo, s->f);
4287 		break;
4288 	case GOT_OBJ_TYPE_COMMIT: {
4289 		const struct got_object_id_queue *parent_ids;
4290 		struct got_object_qid *pid;
4291 		struct got_commit_object *commit2;
4292 		struct got_reflist_head *refs;
4293 
4294 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4295 		if (err)
4296 			goto done;
4297 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4298 		/* Show commit info if we're diffing to a parent/root commit. */
4299 		if (s->id1 == NULL) {
4300 			err = write_commit_info(&s->line_offsets, &s->nlines,
4301 			    s->id2, refs, s->repo, s->f);
4302 			if (err)
4303 				goto done;
4304 		} else {
4305 			parent_ids = got_object_commit_get_parent_ids(commit2);
4306 			STAILQ_FOREACH(pid, parent_ids, entry) {
4307 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4308 					err = write_commit_info(
4309 					    &s->line_offsets, &s->nlines,
4310 					    s->id2, refs, s->repo, s->f);
4311 					if (err)
4312 						goto done;
4313 					break;
4314 				}
4315 			}
4316 		}
4317 		got_object_commit_close(commit2);
4318 
4319 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4320 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4321 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4322 		    s->force_text_diff, s->repo, s->f);
4323 		break;
4324 	}
4325 	default:
4326 		err = got_error(GOT_ERR_OBJ_TYPE);
4327 		break;
4328 	}
4329 	if (err)
4330 		goto done;
4331 done:
4332 	if (s->f && fflush(s->f) != 0 && err == NULL)
4333 		err = got_error_from_errno("fflush");
4334 	return err;
4335 }
4336 
4337 static void
4338 diff_view_indicate_progress(struct tog_view *view)
4339 {
4340 	mvwaddstr(view->window, 0, 0, "diffing...");
4341 	update_panels();
4342 	doupdate();
4343 }
4344 
4345 static const struct got_error *
4346 search_start_diff_view(struct tog_view *view)
4347 {
4348 	struct tog_diff_view_state *s = &view->state.diff;
4349 
4350 	s->matched_line = 0;
4351 	return NULL;
4352 }
4353 
4354 static const struct got_error *
4355 search_next_diff_view(struct tog_view *view)
4356 {
4357 	struct tog_diff_view_state *s = &view->state.diff;
4358 	const struct got_error *err = NULL;
4359 	int lineno;
4360 	char *line = NULL;
4361 	size_t linesize = 0;
4362 	ssize_t linelen;
4363 
4364 	if (!view->searching) {
4365 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4366 		return NULL;
4367 	}
4368 
4369 	if (s->matched_line) {
4370 		if (view->searching == TOG_SEARCH_FORWARD)
4371 			lineno = s->matched_line + 1;
4372 		else
4373 			lineno = s->matched_line - 1;
4374 	} else
4375 		lineno = s->first_displayed_line;
4376 
4377 	while (1) {
4378 		off_t offset;
4379 
4380 		if (lineno <= 0 || lineno > s->nlines) {
4381 			if (s->matched_line == 0) {
4382 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4383 				break;
4384 			}
4385 
4386 			if (view->searching == TOG_SEARCH_FORWARD)
4387 				lineno = 1;
4388 			else
4389 				lineno = s->nlines;
4390 		}
4391 
4392 		offset = s->line_offsets[lineno - 1];
4393 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4394 			free(line);
4395 			return got_error_from_errno("fseeko");
4396 		}
4397 		linelen = getline(&line, &linesize, s->f);
4398 		if (linelen != -1) {
4399 			char *exstr;
4400 			err = expand_tab(&exstr, line);
4401 			if (err)
4402 				break;
4403 			if (match_line(exstr, &view->regex, 1,
4404 			    &view->regmatch)) {
4405 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4406 				s->matched_line = lineno;
4407 				free(exstr);
4408 				break;
4409 			}
4410 			free(exstr);
4411 		}
4412 		if (view->searching == TOG_SEARCH_FORWARD)
4413 			lineno++;
4414 		else
4415 			lineno--;
4416 	}
4417 	free(line);
4418 
4419 	if (s->matched_line) {
4420 		s->first_displayed_line = s->matched_line;
4421 		s->selected_line = 1;
4422 	}
4423 
4424 	return err;
4425 }
4426 
4427 static const struct got_error *
4428 close_diff_view(struct tog_view *view)
4429 {
4430 	const struct got_error *err = NULL;
4431 	struct tog_diff_view_state *s = &view->state.diff;
4432 
4433 	free(s->id1);
4434 	s->id1 = NULL;
4435 	free(s->id2);
4436 	s->id2 = NULL;
4437 	if (s->f && fclose(s->f) == EOF)
4438 		err = got_error_from_errno("fclose");
4439 	s->f = NULL;
4440 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4441 		err = got_error_from_errno("fclose");
4442 	s->f1 = NULL;
4443 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4444 		err = got_error_from_errno("fclose");
4445 	s->f2 = NULL;
4446 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4447 		err = got_error_from_errno("close");
4448 	s->fd1 = -1;
4449 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4450 		err = got_error_from_errno("close");
4451 	s->fd2 = -1;
4452 	free_colors(&s->colors);
4453 	free(s->line_offsets);
4454 	s->line_offsets = NULL;
4455 	s->nlines = 0;
4456 	return err;
4457 }
4458 
4459 static const struct got_error *
4460 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4461     struct got_object_id *id2, const char *label1, const char *label2,
4462     int diff_context, int ignore_whitespace, int force_text_diff,
4463     struct tog_view *parent_view, struct got_repository *repo)
4464 {
4465 	const struct got_error *err;
4466 	struct tog_diff_view_state *s = &view->state.diff;
4467 
4468 	memset(s, 0, sizeof(*s));
4469 	s->fd1 = -1;
4470 	s->fd2 = -1;
4471 
4472 	if (id1 != NULL && id2 != NULL) {
4473 	    int type1, type2;
4474 	    err = got_object_get_type(&type1, repo, id1);
4475 	    if (err)
4476 		return err;
4477 	    err = got_object_get_type(&type2, repo, id2);
4478 	    if (err)
4479 		return err;
4480 
4481 	    if (type1 != type2)
4482 		return got_error(GOT_ERR_OBJ_TYPE);
4483 	}
4484 	s->first_displayed_line = 1;
4485 	s->last_displayed_line = view->nlines;
4486 	s->selected_line = 1;
4487 	s->repo = repo;
4488 	s->id1 = id1;
4489 	s->id2 = id2;
4490 	s->label1 = label1;
4491 	s->label2 = label2;
4492 
4493 	if (id1) {
4494 		s->id1 = got_object_id_dup(id1);
4495 		if (s->id1 == NULL)
4496 			return got_error_from_errno("got_object_id_dup");
4497 	} else
4498 		s->id1 = NULL;
4499 
4500 	s->id2 = got_object_id_dup(id2);
4501 	if (s->id2 == NULL) {
4502 		err = got_error_from_errno("got_object_id_dup");
4503 		goto done;
4504 	}
4505 
4506 	s->f1 = got_opentemp();
4507 	if (s->f1 == NULL) {
4508 		err = got_error_from_errno("got_opentemp");
4509 		goto done;
4510 	}
4511 
4512 	s->f2 = got_opentemp();
4513 	if (s->f2 == NULL) {
4514 		err = got_error_from_errno("got_opentemp");
4515 		goto done;
4516 	}
4517 
4518 	s->fd1 = got_opentempfd();
4519 	if (s->fd1 == -1) {
4520 		err = got_error_from_errno("got_opentempfd");
4521 		goto done;
4522 	}
4523 
4524 	s->fd2 = got_opentempfd();
4525 	if (s->fd2 == -1) {
4526 		err = got_error_from_errno("got_opentempfd");
4527 		goto done;
4528 	}
4529 
4530 	s->first_displayed_line = 1;
4531 	s->last_displayed_line = view->nlines;
4532 	s->diff_context = diff_context;
4533 	s->ignore_whitespace = ignore_whitespace;
4534 	s->force_text_diff = force_text_diff;
4535 	s->parent_view = parent_view;
4536 	s->repo = repo;
4537 
4538 	STAILQ_INIT(&s->colors);
4539 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4540 		err = add_color(&s->colors,
4541 		    "^-", TOG_COLOR_DIFF_MINUS,
4542 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4543 		if (err)
4544 			goto done;
4545 		err = add_color(&s->colors, "^\\+",
4546 		    TOG_COLOR_DIFF_PLUS,
4547 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4548 		if (err)
4549 			goto done;
4550 		err = add_color(&s->colors,
4551 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4552 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4553 		if (err)
4554 			goto done;
4555 
4556 		err = add_color(&s->colors,
4557 		    "^(commit [0-9a-f]|parent [0-9]|"
4558 		    "(blob|file|tree|commit) [-+] |"
4559 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4560 		    get_color_value("TOG_COLOR_DIFF_META"));
4561 		if (err)
4562 			goto done;
4563 
4564 		err = add_color(&s->colors,
4565 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4566 		    get_color_value("TOG_COLOR_AUTHOR"));
4567 		if (err)
4568 			goto done;
4569 
4570 		err = add_color(&s->colors,
4571 		    "^date: ", TOG_COLOR_DATE,
4572 		    get_color_value("TOG_COLOR_DATE"));
4573 		if (err)
4574 			goto done;
4575 	}
4576 
4577 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4578 	    view_is_splitscreen(view))
4579 		show_log_view(parent_view); /* draw border */
4580 	diff_view_indicate_progress(view);
4581 
4582 	err = create_diff(s);
4583 
4584 	view->show = show_diff_view;
4585 	view->input = input_diff_view;
4586 	view->reset = reset_diff_view;
4587 	view->close = close_diff_view;
4588 	view->search_start = search_start_diff_view;
4589 	view->search_next = search_next_diff_view;
4590 done:
4591 	if (err)
4592 		close_diff_view(view);
4593 	return err;
4594 }
4595 
4596 static const struct got_error *
4597 show_diff_view(struct tog_view *view)
4598 {
4599 	const struct got_error *err;
4600 	struct tog_diff_view_state *s = &view->state.diff;
4601 	char *id_str1 = NULL, *id_str2, *header;
4602 	const char *label1, *label2;
4603 
4604 	if (s->id1) {
4605 		err = got_object_id_str(&id_str1, s->id1);
4606 		if (err)
4607 			return err;
4608 		label1 = s->label1 ? : id_str1;
4609 	} else
4610 		label1 = "/dev/null";
4611 
4612 	err = got_object_id_str(&id_str2, s->id2);
4613 	if (err)
4614 		return err;
4615 	label2 = s->label2 ? : id_str2;
4616 
4617 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4618 		err = got_error_from_errno("asprintf");
4619 		free(id_str1);
4620 		free(id_str2);
4621 		return err;
4622 	}
4623 	free(id_str1);
4624 	free(id_str2);
4625 
4626 	err = draw_file(view, header);
4627 	free(header);
4628 	return err;
4629 }
4630 
4631 static const struct got_error *
4632 set_selected_commit(struct tog_diff_view_state *s,
4633     struct commit_queue_entry *entry)
4634 {
4635 	const struct got_error *err;
4636 	const struct got_object_id_queue *parent_ids;
4637 	struct got_commit_object *selected_commit;
4638 	struct got_object_qid *pid;
4639 
4640 	free(s->id2);
4641 	s->id2 = got_object_id_dup(entry->id);
4642 	if (s->id2 == NULL)
4643 		return got_error_from_errno("got_object_id_dup");
4644 
4645 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4646 	if (err)
4647 		return err;
4648 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4649 	free(s->id1);
4650 	pid = STAILQ_FIRST(parent_ids);
4651 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4652 	got_object_commit_close(selected_commit);
4653 	return NULL;
4654 }
4655 
4656 static const struct got_error *
4657 reset_diff_view(struct tog_view *view)
4658 {
4659 	struct tog_diff_view_state *s = &view->state.diff;
4660 
4661 	view->count = 0;
4662 	wclear(view->window);
4663 	s->first_displayed_line = 1;
4664 	s->last_displayed_line = view->nlines;
4665 	s->matched_line = 0;
4666 	diff_view_indicate_progress(view);
4667 	return create_diff(s);
4668 }
4669 
4670 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4671     int, int, int);
4672 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4673     int, int);
4674 
4675 static const struct got_error *
4676 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4677 {
4678 	const struct got_error *err = NULL;
4679 	struct tog_diff_view_state *s = &view->state.diff;
4680 	struct tog_log_view_state *ls;
4681 	struct commit_queue_entry *old_selected_entry;
4682 	char *line = NULL;
4683 	size_t linesize = 0;
4684 	ssize_t linelen;
4685 	int i, nscroll = view->nlines - 1, up = 0;
4686 
4687 	switch (ch) {
4688 	case '0':
4689 		view->x = 0;
4690 		break;
4691 	case '$':
4692 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4693 		view->count = 0;
4694 		break;
4695 	case KEY_RIGHT:
4696 	case 'l':
4697 		if (view->x + view->ncols / 3 < view->maxx)
4698 			view->x += 2;  /* move two columns right */
4699 		else
4700 			view->count = 0;
4701 		break;
4702 	case KEY_LEFT:
4703 	case 'h':
4704 		view->x -= MIN(view->x, 2);  /* move two columns back */
4705 		if (view->x <= 0)
4706 			view->count = 0;
4707 		break;
4708 	case 'a':
4709 	case 'w':
4710 		if (ch == 'a')
4711 			s->force_text_diff = !s->force_text_diff;
4712 		if (ch == 'w')
4713 			s->ignore_whitespace = !s->ignore_whitespace;
4714 		err = reset_diff_view(view);
4715 		break;
4716 	case 'g':
4717 	case KEY_HOME:
4718 		s->first_displayed_line = 1;
4719 		view->count = 0;
4720 		break;
4721 	case 'G':
4722 	case KEY_END:
4723 		view->count = 0;
4724 		if (s->eof)
4725 			break;
4726 
4727 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4728 		s->eof = 1;
4729 		break;
4730 	case 'k':
4731 	case KEY_UP:
4732 	case CTRL('p'):
4733 		if (s->first_displayed_line > 1)
4734 			s->first_displayed_line--;
4735 		else
4736 			view->count = 0;
4737 		break;
4738 	case CTRL('u'):
4739 	case 'u':
4740 		nscroll /= 2;
4741 		/* FALL THROUGH */
4742 	case KEY_PPAGE:
4743 	case CTRL('b'):
4744 	case 'b':
4745 		if (s->first_displayed_line == 1) {
4746 			view->count = 0;
4747 			break;
4748 		}
4749 		i = 0;
4750 		while (i++ < nscroll && s->first_displayed_line > 1)
4751 			s->first_displayed_line--;
4752 		break;
4753 	case 'j':
4754 	case KEY_DOWN:
4755 	case CTRL('n'):
4756 		if (!s->eof)
4757 			s->first_displayed_line++;
4758 		else
4759 			view->count = 0;
4760 		break;
4761 	case CTRL('d'):
4762 	case 'd':
4763 		nscroll /= 2;
4764 		/* FALL THROUGH */
4765 	case KEY_NPAGE:
4766 	case CTRL('f'):
4767 	case 'f':
4768 	case ' ':
4769 		if (s->eof) {
4770 			view->count = 0;
4771 			break;
4772 		}
4773 		i = 0;
4774 		while (!s->eof && i++ < nscroll) {
4775 			linelen = getline(&line, &linesize, s->f);
4776 			s->first_displayed_line++;
4777 			if (linelen == -1) {
4778 				if (feof(s->f)) {
4779 					s->eof = 1;
4780 				} else
4781 					err = got_ferror(s->f, GOT_ERR_IO);
4782 				break;
4783 			}
4784 		}
4785 		free(line);
4786 		break;
4787 	case '[':
4788 		if (s->diff_context > 0) {
4789 			s->diff_context--;
4790 			s->matched_line = 0;
4791 			diff_view_indicate_progress(view);
4792 			err = create_diff(s);
4793 			if (s->first_displayed_line + view->nlines - 1 >
4794 			    s->nlines) {
4795 				s->first_displayed_line = 1;
4796 				s->last_displayed_line = view->nlines;
4797 			}
4798 		} else
4799 			view->count = 0;
4800 		break;
4801 	case ']':
4802 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4803 			s->diff_context++;
4804 			s->matched_line = 0;
4805 			diff_view_indicate_progress(view);
4806 			err = create_diff(s);
4807 		} else
4808 			view->count = 0;
4809 		break;
4810 	case '<':
4811 	case ',':
4812 		up = 1;
4813 		/* FALL THROUGH */
4814 	case '>':
4815 	case '.':
4816 		if (s->parent_view == NULL) {
4817 			view->count = 0;
4818 			break;
4819 		}
4820 		s->parent_view->count = view->count;
4821 
4822 		if (s->parent_view->type == TOG_VIEW_LOG) {
4823 			ls = &s->parent_view->state.log;
4824 			old_selected_entry = ls->selected_entry;
4825 
4826 			err = input_log_view(NULL, s->parent_view,
4827 			    up ? KEY_UP : KEY_DOWN);
4828 			if (err)
4829 				break;
4830 			view->count = s->parent_view->count;
4831 
4832 			if (old_selected_entry == ls->selected_entry)
4833 				break;
4834 
4835 			err = set_selected_commit(s, ls->selected_entry);
4836 			if (err)
4837 				break;
4838 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4839 			struct tog_blame_view_state *bs;
4840 			struct got_object_id *id, *prev_id;
4841 
4842 			bs = &s->parent_view->state.blame;
4843 			prev_id = get_annotation_for_line(bs->blame.lines,
4844 			    bs->blame.nlines, bs->last_diffed_line);
4845 
4846 			err = input_blame_view(&view, s->parent_view,
4847 			    up ? KEY_UP : KEY_DOWN);
4848 			if (err)
4849 				break;
4850 			view->count = s->parent_view->count;
4851 
4852 			if (prev_id == NULL)
4853 				break;
4854 			id = get_selected_commit_id(bs->blame.lines,
4855 			    bs->blame.nlines, bs->first_displayed_line,
4856 			    bs->selected_line);
4857 			if (id == NULL)
4858 				break;
4859 
4860 			if (!got_object_id_cmp(prev_id, id))
4861 				break;
4862 
4863 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4864 			if (err)
4865 				break;
4866 		}
4867 		s->first_displayed_line = 1;
4868 		s->last_displayed_line = view->nlines;
4869 		s->matched_line = 0;
4870 		view->x = 0;
4871 
4872 		diff_view_indicate_progress(view);
4873 		err = create_diff(s);
4874 		break;
4875 	default:
4876 		view->count = 0;
4877 		break;
4878 	}
4879 
4880 	return err;
4881 }
4882 
4883 static const struct got_error *
4884 cmd_diff(int argc, char *argv[])
4885 {
4886 	const struct got_error *error = NULL;
4887 	struct got_repository *repo = NULL;
4888 	struct got_worktree *worktree = NULL;
4889 	struct got_object_id *id1 = NULL, *id2 = NULL;
4890 	char *repo_path = NULL, *cwd = NULL;
4891 	char *id_str1 = NULL, *id_str2 = NULL;
4892 	char *label1 = NULL, *label2 = NULL;
4893 	int diff_context = 3, ignore_whitespace = 0;
4894 	int ch, force_text_diff = 0;
4895 	const char *errstr;
4896 	struct tog_view *view;
4897 	int *pack_fds = NULL;
4898 
4899 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4900 		switch (ch) {
4901 		case 'a':
4902 			force_text_diff = 1;
4903 			break;
4904 		case 'C':
4905 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4906 			    &errstr);
4907 			if (errstr != NULL)
4908 				errx(1, "number of context lines is %s: %s",
4909 				    errstr, errstr);
4910 			break;
4911 		case 'r':
4912 			repo_path = realpath(optarg, NULL);
4913 			if (repo_path == NULL)
4914 				return got_error_from_errno2("realpath",
4915 				    optarg);
4916 			got_path_strip_trailing_slashes(repo_path);
4917 			break;
4918 		case 'w':
4919 			ignore_whitespace = 1;
4920 			break;
4921 		default:
4922 			usage_diff();
4923 			/* NOTREACHED */
4924 		}
4925 	}
4926 
4927 	argc -= optind;
4928 	argv += optind;
4929 
4930 	if (argc == 0) {
4931 		usage_diff(); /* TODO show local worktree changes */
4932 	} else if (argc == 2) {
4933 		id_str1 = argv[0];
4934 		id_str2 = argv[1];
4935 	} else
4936 		usage_diff();
4937 
4938 	error = got_repo_pack_fds_open(&pack_fds);
4939 	if (error)
4940 		goto done;
4941 
4942 	if (repo_path == NULL) {
4943 		cwd = getcwd(NULL, 0);
4944 		if (cwd == NULL)
4945 			return got_error_from_errno("getcwd");
4946 		error = got_worktree_open(&worktree, cwd);
4947 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4948 			goto done;
4949 		if (worktree)
4950 			repo_path =
4951 			    strdup(got_worktree_get_repo_path(worktree));
4952 		else
4953 			repo_path = strdup(cwd);
4954 		if (repo_path == NULL) {
4955 			error = got_error_from_errno("strdup");
4956 			goto done;
4957 		}
4958 	}
4959 
4960 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4961 	if (error)
4962 		goto done;
4963 
4964 	init_curses();
4965 
4966 	error = apply_unveil(got_repo_get_path(repo), NULL);
4967 	if (error)
4968 		goto done;
4969 
4970 	error = tog_load_refs(repo, 0);
4971 	if (error)
4972 		goto done;
4973 
4974 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4975 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4976 	if (error)
4977 		goto done;
4978 
4979 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4980 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4981 	if (error)
4982 		goto done;
4983 
4984 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4985 	if (view == NULL) {
4986 		error = got_error_from_errno("view_open");
4987 		goto done;
4988 	}
4989 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4990 	    ignore_whitespace, force_text_diff, NULL,  repo);
4991 	if (error)
4992 		goto done;
4993 	error = view_loop(view);
4994 done:
4995 	free(label1);
4996 	free(label2);
4997 	free(repo_path);
4998 	free(cwd);
4999 	if (repo) {
5000 		const struct got_error *close_err = got_repo_close(repo);
5001 		if (error == NULL)
5002 			error = close_err;
5003 	}
5004 	if (worktree)
5005 		got_worktree_close(worktree);
5006 	if (pack_fds) {
5007 		const struct got_error *pack_err =
5008 		    got_repo_pack_fds_close(pack_fds);
5009 		if (error == NULL)
5010 			error = pack_err;
5011 	}
5012 	tog_free_refs();
5013 	return error;
5014 }
5015 
5016 __dead static void
5017 usage_blame(void)
5018 {
5019 	endwin();
5020 	fprintf(stderr,
5021 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5022 	    getprogname());
5023 	exit(1);
5024 }
5025 
5026 struct tog_blame_line {
5027 	int annotated;
5028 	struct got_object_id *id;
5029 };
5030 
5031 static const struct got_error *
5032 draw_blame(struct tog_view *view)
5033 {
5034 	struct tog_blame_view_state *s = &view->state.blame;
5035 	struct tog_blame *blame = &s->blame;
5036 	regmatch_t *regmatch = &view->regmatch;
5037 	const struct got_error *err;
5038 	int lineno = 0, nprinted = 0;
5039 	char *line = NULL;
5040 	size_t linesize = 0;
5041 	ssize_t linelen;
5042 	wchar_t *wline;
5043 	int width;
5044 	struct tog_blame_line *blame_line;
5045 	struct got_object_id *prev_id = NULL;
5046 	char *id_str;
5047 	struct tog_color *tc;
5048 
5049 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5050 	if (err)
5051 		return err;
5052 
5053 	rewind(blame->f);
5054 	werase(view->window);
5055 
5056 	if (asprintf(&line, "commit %s", id_str) == -1) {
5057 		err = got_error_from_errno("asprintf");
5058 		free(id_str);
5059 		return err;
5060 	}
5061 
5062 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5063 	free(line);
5064 	line = NULL;
5065 	if (err)
5066 		return err;
5067 	if (view_needs_focus_indication(view))
5068 		wstandout(view->window);
5069 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5070 	if (tc)
5071 		wattr_on(view->window,
5072 		    COLOR_PAIR(tc->colorpair), NULL);
5073 	waddwstr(view->window, wline);
5074 	if (tc)
5075 		wattr_off(view->window,
5076 		    COLOR_PAIR(tc->colorpair), NULL);
5077 	if (view_needs_focus_indication(view))
5078 		wstandend(view->window);
5079 	free(wline);
5080 	wline = NULL;
5081 	if (width < view->ncols - 1)
5082 		waddch(view->window, '\n');
5083 
5084 	if (asprintf(&line, "[%d/%d] %s%s",
5085 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5086 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5087 		free(id_str);
5088 		return got_error_from_errno("asprintf");
5089 	}
5090 	free(id_str);
5091 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5092 	free(line);
5093 	line = NULL;
5094 	if (err)
5095 		return err;
5096 	waddwstr(view->window, wline);
5097 	free(wline);
5098 	wline = NULL;
5099 	if (width < view->ncols - 1)
5100 		waddch(view->window, '\n');
5101 
5102 	s->eof = 0;
5103 	view->maxx = 0;
5104 	while (nprinted < view->nlines - 2) {
5105 		linelen = getline(&line, &linesize, blame->f);
5106 		if (linelen == -1) {
5107 			if (feof(blame->f)) {
5108 				s->eof = 1;
5109 				break;
5110 			}
5111 			free(line);
5112 			return got_ferror(blame->f, GOT_ERR_IO);
5113 		}
5114 		if (++lineno < s->first_displayed_line)
5115 			continue;
5116 
5117 		/* Set view->maxx based on full line length. */
5118 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5119 		if (err) {
5120 			free(line);
5121 			return err;
5122 		}
5123 		free(wline);
5124 		wline = NULL;
5125 		view->maxx = MAX(view->maxx, width);
5126 
5127 		if (nprinted == s->selected_line - 1)
5128 			wstandout(view->window);
5129 
5130 		if (blame->nlines > 0) {
5131 			blame_line = &blame->lines[lineno - 1];
5132 			if (blame_line->annotated && prev_id &&
5133 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5134 			    !(nprinted == s->selected_line - 1)) {
5135 				waddstr(view->window, "        ");
5136 			} else if (blame_line->annotated) {
5137 				char *id_str;
5138 				err = got_object_id_str(&id_str,
5139 				    blame_line->id);
5140 				if (err) {
5141 					free(line);
5142 					return err;
5143 				}
5144 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5145 				if (tc)
5146 					wattr_on(view->window,
5147 					    COLOR_PAIR(tc->colorpair), NULL);
5148 				wprintw(view->window, "%.8s", id_str);
5149 				if (tc)
5150 					wattr_off(view->window,
5151 					    COLOR_PAIR(tc->colorpair), NULL);
5152 				free(id_str);
5153 				prev_id = blame_line->id;
5154 			} else {
5155 				waddstr(view->window, "........");
5156 				prev_id = NULL;
5157 			}
5158 		} else {
5159 			waddstr(view->window, "........");
5160 			prev_id = NULL;
5161 		}
5162 
5163 		if (nprinted == s->selected_line - 1)
5164 			wstandend(view->window);
5165 		waddstr(view->window, " ");
5166 
5167 		if (view->ncols <= 9) {
5168 			width = 9;
5169 		} else if (s->first_displayed_line + nprinted ==
5170 		    s->matched_line &&
5171 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5172 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5173 			    view->window, view->x, regmatch);
5174 			if (err) {
5175 				free(line);
5176 				return err;
5177 			}
5178 			width += 9;
5179 		} else {
5180 			int skip;
5181 			err = format_line(&wline, &width, &skip, line,
5182 			    view->x, view->ncols - 9, 9, 1);
5183 			if (err) {
5184 				free(line);
5185 				return err;
5186 			}
5187 			waddwstr(view->window, &wline[skip]);
5188 			width += 9;
5189 			free(wline);
5190 			wline = NULL;
5191 		}
5192 
5193 		if (width <= view->ncols - 1)
5194 			waddch(view->window, '\n');
5195 		if (++nprinted == 1)
5196 			s->first_displayed_line = lineno;
5197 	}
5198 	free(line);
5199 	s->last_displayed_line = lineno;
5200 
5201 	view_border(view);
5202 
5203 	return NULL;
5204 }
5205 
5206 static const struct got_error *
5207 blame_cb(void *arg, int nlines, int lineno,
5208     struct got_commit_object *commit, struct got_object_id *id)
5209 {
5210 	const struct got_error *err = NULL;
5211 	struct tog_blame_cb_args *a = arg;
5212 	struct tog_blame_line *line;
5213 	int errcode;
5214 
5215 	if (nlines != a->nlines ||
5216 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5217 		return got_error(GOT_ERR_RANGE);
5218 
5219 	errcode = pthread_mutex_lock(&tog_mutex);
5220 	if (errcode)
5221 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5222 
5223 	if (*a->quit) {	/* user has quit the blame view */
5224 		err = got_error(GOT_ERR_ITER_COMPLETED);
5225 		goto done;
5226 	}
5227 
5228 	if (lineno == -1)
5229 		goto done; /* no change in this commit */
5230 
5231 	line = &a->lines[lineno - 1];
5232 	if (line->annotated)
5233 		goto done;
5234 
5235 	line->id = got_object_id_dup(id);
5236 	if (line->id == NULL) {
5237 		err = got_error_from_errno("got_object_id_dup");
5238 		goto done;
5239 	}
5240 	line->annotated = 1;
5241 done:
5242 	errcode = pthread_mutex_unlock(&tog_mutex);
5243 	if (errcode)
5244 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5245 	return err;
5246 }
5247 
5248 static void *
5249 blame_thread(void *arg)
5250 {
5251 	const struct got_error *err, *close_err;
5252 	struct tog_blame_thread_args *ta = arg;
5253 	struct tog_blame_cb_args *a = ta->cb_args;
5254 	int errcode, fd1 = -1, fd2 = -1;
5255 	FILE *f1 = NULL, *f2 = NULL;
5256 
5257 	fd1 = got_opentempfd();
5258 	if (fd1 == -1)
5259 		return (void *)got_error_from_errno("got_opentempfd");
5260 
5261 	fd2 = got_opentempfd();
5262 	if (fd2 == -1) {
5263 		err = got_error_from_errno("got_opentempfd");
5264 		goto done;
5265 	}
5266 
5267 	f1 = got_opentemp();
5268 	if (f1 == NULL) {
5269 		err = (void *)got_error_from_errno("got_opentemp");
5270 		goto done;
5271 	}
5272 	f2 = got_opentemp();
5273 	if (f2 == NULL) {
5274 		err = (void *)got_error_from_errno("got_opentemp");
5275 		goto done;
5276 	}
5277 
5278 	err = block_signals_used_by_main_thread();
5279 	if (err)
5280 		goto done;
5281 
5282 	err = got_blame(ta->path, a->commit_id, ta->repo,
5283 	    tog_diff_algo, blame_cb, ta->cb_args,
5284 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5285 	if (err && err->code == GOT_ERR_CANCELLED)
5286 		err = NULL;
5287 
5288 	errcode = pthread_mutex_lock(&tog_mutex);
5289 	if (errcode) {
5290 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5291 		goto done;
5292 	}
5293 
5294 	close_err = got_repo_close(ta->repo);
5295 	if (err == NULL)
5296 		err = close_err;
5297 	ta->repo = NULL;
5298 	*ta->complete = 1;
5299 
5300 	errcode = pthread_mutex_unlock(&tog_mutex);
5301 	if (errcode && err == NULL)
5302 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5303 
5304 done:
5305 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5306 		err = got_error_from_errno("close");
5307 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5308 		err = got_error_from_errno("close");
5309 	if (f1 && fclose(f1) == EOF && err == NULL)
5310 		err = got_error_from_errno("fclose");
5311 	if (f2 && fclose(f2) == EOF && err == NULL)
5312 		err = got_error_from_errno("fclose");
5313 
5314 	return (void *)err;
5315 }
5316 
5317 static struct got_object_id *
5318 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5319     int first_displayed_line, int selected_line)
5320 {
5321 	struct tog_blame_line *line;
5322 
5323 	if (nlines <= 0)
5324 		return NULL;
5325 
5326 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5327 	if (!line->annotated)
5328 		return NULL;
5329 
5330 	return line->id;
5331 }
5332 
5333 static struct got_object_id *
5334 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5335     int lineno)
5336 {
5337 	struct tog_blame_line *line;
5338 
5339 	if (nlines <= 0 || lineno >= nlines)
5340 		return NULL;
5341 
5342 	line = &lines[lineno - 1];
5343 	if (!line->annotated)
5344 		return NULL;
5345 
5346 	return line->id;
5347 }
5348 
5349 static const struct got_error *
5350 stop_blame(struct tog_blame *blame)
5351 {
5352 	const struct got_error *err = NULL;
5353 	int i;
5354 
5355 	if (blame->thread) {
5356 		int errcode;
5357 		errcode = pthread_mutex_unlock(&tog_mutex);
5358 		if (errcode)
5359 			return got_error_set_errno(errcode,
5360 			    "pthread_mutex_unlock");
5361 		errcode = pthread_join(blame->thread, (void **)&err);
5362 		if (errcode)
5363 			return got_error_set_errno(errcode, "pthread_join");
5364 		errcode = pthread_mutex_lock(&tog_mutex);
5365 		if (errcode)
5366 			return got_error_set_errno(errcode,
5367 			    "pthread_mutex_lock");
5368 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5369 			err = NULL;
5370 		blame->thread = 0; //NULL;
5371 	}
5372 	if (blame->thread_args.repo) {
5373 		const struct got_error *close_err;
5374 		close_err = got_repo_close(blame->thread_args.repo);
5375 		if (err == NULL)
5376 			err = close_err;
5377 		blame->thread_args.repo = NULL;
5378 	}
5379 	if (blame->f) {
5380 		if (fclose(blame->f) == EOF && err == NULL)
5381 			err = got_error_from_errno("fclose");
5382 		blame->f = NULL;
5383 	}
5384 	if (blame->lines) {
5385 		for (i = 0; i < blame->nlines; i++)
5386 			free(blame->lines[i].id);
5387 		free(blame->lines);
5388 		blame->lines = NULL;
5389 	}
5390 	free(blame->cb_args.commit_id);
5391 	blame->cb_args.commit_id = NULL;
5392 	if (blame->pack_fds) {
5393 		const struct got_error *pack_err =
5394 		    got_repo_pack_fds_close(blame->pack_fds);
5395 		if (err == NULL)
5396 			err = pack_err;
5397 		blame->pack_fds = NULL;
5398 	}
5399 	return err;
5400 }
5401 
5402 static const struct got_error *
5403 cancel_blame_view(void *arg)
5404 {
5405 	const struct got_error *err = NULL;
5406 	int *done = arg;
5407 	int errcode;
5408 
5409 	errcode = pthread_mutex_lock(&tog_mutex);
5410 	if (errcode)
5411 		return got_error_set_errno(errcode,
5412 		    "pthread_mutex_unlock");
5413 
5414 	if (*done)
5415 		err = got_error(GOT_ERR_CANCELLED);
5416 
5417 	errcode = pthread_mutex_unlock(&tog_mutex);
5418 	if (errcode)
5419 		return got_error_set_errno(errcode,
5420 		    "pthread_mutex_lock");
5421 
5422 	return err;
5423 }
5424 
5425 static const struct got_error *
5426 run_blame(struct tog_view *view)
5427 {
5428 	struct tog_blame_view_state *s = &view->state.blame;
5429 	struct tog_blame *blame = &s->blame;
5430 	const struct got_error *err = NULL;
5431 	struct got_commit_object *commit = NULL;
5432 	struct got_blob_object *blob = NULL;
5433 	struct got_repository *thread_repo = NULL;
5434 	struct got_object_id *obj_id = NULL;
5435 	int obj_type, fd = -1;
5436 	int *pack_fds = NULL;
5437 
5438 	err = got_object_open_as_commit(&commit, s->repo,
5439 	    &s->blamed_commit->id);
5440 	if (err)
5441 		return err;
5442 
5443 	fd = got_opentempfd();
5444 	if (fd == -1) {
5445 		err = got_error_from_errno("got_opentempfd");
5446 		goto done;
5447 	}
5448 
5449 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5450 	if (err)
5451 		goto done;
5452 
5453 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5454 	if (err)
5455 		goto done;
5456 
5457 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5458 		err = got_error(GOT_ERR_OBJ_TYPE);
5459 		goto done;
5460 	}
5461 
5462 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5463 	if (err)
5464 		goto done;
5465 	blame->f = got_opentemp();
5466 	if (blame->f == NULL) {
5467 		err = got_error_from_errno("got_opentemp");
5468 		goto done;
5469 	}
5470 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5471 	    &blame->line_offsets, blame->f, blob);
5472 	if (err)
5473 		goto done;
5474 	if (blame->nlines == 0) {
5475 		s->blame_complete = 1;
5476 		goto done;
5477 	}
5478 
5479 	/* Don't include \n at EOF in the blame line count. */
5480 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5481 		blame->nlines--;
5482 
5483 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5484 	if (blame->lines == NULL) {
5485 		err = got_error_from_errno("calloc");
5486 		goto done;
5487 	}
5488 
5489 	err = got_repo_pack_fds_open(&pack_fds);
5490 	if (err)
5491 		goto done;
5492 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5493 	    pack_fds);
5494 	if (err)
5495 		goto done;
5496 
5497 	blame->pack_fds = pack_fds;
5498 	blame->cb_args.view = view;
5499 	blame->cb_args.lines = blame->lines;
5500 	blame->cb_args.nlines = blame->nlines;
5501 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5502 	if (blame->cb_args.commit_id == NULL) {
5503 		err = got_error_from_errno("got_object_id_dup");
5504 		goto done;
5505 	}
5506 	blame->cb_args.quit = &s->done;
5507 
5508 	blame->thread_args.path = s->path;
5509 	blame->thread_args.repo = thread_repo;
5510 	blame->thread_args.cb_args = &blame->cb_args;
5511 	blame->thread_args.complete = &s->blame_complete;
5512 	blame->thread_args.cancel_cb = cancel_blame_view;
5513 	blame->thread_args.cancel_arg = &s->done;
5514 	s->blame_complete = 0;
5515 
5516 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5517 		s->first_displayed_line = 1;
5518 		s->last_displayed_line = view->nlines;
5519 		s->selected_line = 1;
5520 	}
5521 	s->matched_line = 0;
5522 
5523 done:
5524 	if (commit)
5525 		got_object_commit_close(commit);
5526 	if (fd != -1 && close(fd) == -1 && err == NULL)
5527 		err = got_error_from_errno("close");
5528 	if (blob)
5529 		got_object_blob_close(blob);
5530 	free(obj_id);
5531 	if (err)
5532 		stop_blame(blame);
5533 	return err;
5534 }
5535 
5536 static const struct got_error *
5537 open_blame_view(struct tog_view *view, char *path,
5538     struct got_object_id *commit_id, struct got_repository *repo)
5539 {
5540 	const struct got_error *err = NULL;
5541 	struct tog_blame_view_state *s = &view->state.blame;
5542 
5543 	STAILQ_INIT(&s->blamed_commits);
5544 
5545 	s->path = strdup(path);
5546 	if (s->path == NULL)
5547 		return got_error_from_errno("strdup");
5548 
5549 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5550 	if (err) {
5551 		free(s->path);
5552 		return err;
5553 	}
5554 
5555 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5556 	s->first_displayed_line = 1;
5557 	s->last_displayed_line = view->nlines;
5558 	s->selected_line = 1;
5559 	s->blame_complete = 0;
5560 	s->repo = repo;
5561 	s->commit_id = commit_id;
5562 	memset(&s->blame, 0, sizeof(s->blame));
5563 
5564 	STAILQ_INIT(&s->colors);
5565 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5566 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5567 		    get_color_value("TOG_COLOR_COMMIT"));
5568 		if (err)
5569 			return err;
5570 	}
5571 
5572 	view->show = show_blame_view;
5573 	view->input = input_blame_view;
5574 	view->reset = reset_blame_view;
5575 	view->close = close_blame_view;
5576 	view->search_start = search_start_blame_view;
5577 	view->search_next = search_next_blame_view;
5578 
5579 	return run_blame(view);
5580 }
5581 
5582 static const struct got_error *
5583 close_blame_view(struct tog_view *view)
5584 {
5585 	const struct got_error *err = NULL;
5586 	struct tog_blame_view_state *s = &view->state.blame;
5587 
5588 	if (s->blame.thread)
5589 		err = stop_blame(&s->blame);
5590 
5591 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5592 		struct got_object_qid *blamed_commit;
5593 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5594 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5595 		got_object_qid_free(blamed_commit);
5596 	}
5597 
5598 	free(s->path);
5599 	free_colors(&s->colors);
5600 	return err;
5601 }
5602 
5603 static const struct got_error *
5604 search_start_blame_view(struct tog_view *view)
5605 {
5606 	struct tog_blame_view_state *s = &view->state.blame;
5607 
5608 	s->matched_line = 0;
5609 	return NULL;
5610 }
5611 
5612 static const struct got_error *
5613 search_next_blame_view(struct tog_view *view)
5614 {
5615 	struct tog_blame_view_state *s = &view->state.blame;
5616 	const struct got_error *err = NULL;
5617 	int lineno;
5618 	char *line = NULL;
5619 	size_t linesize = 0;
5620 	ssize_t linelen;
5621 
5622 	if (!view->searching) {
5623 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5624 		return NULL;
5625 	}
5626 
5627 	if (s->matched_line) {
5628 		if (view->searching == TOG_SEARCH_FORWARD)
5629 			lineno = s->matched_line + 1;
5630 		else
5631 			lineno = s->matched_line - 1;
5632 	} else
5633 		lineno = s->first_displayed_line - 1 + s->selected_line;
5634 
5635 	while (1) {
5636 		off_t offset;
5637 
5638 		if (lineno <= 0 || lineno > s->blame.nlines) {
5639 			if (s->matched_line == 0) {
5640 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5641 				break;
5642 			}
5643 
5644 			if (view->searching == TOG_SEARCH_FORWARD)
5645 				lineno = 1;
5646 			else
5647 				lineno = s->blame.nlines;
5648 		}
5649 
5650 		offset = s->blame.line_offsets[lineno - 1];
5651 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5652 			free(line);
5653 			return got_error_from_errno("fseeko");
5654 		}
5655 		linelen = getline(&line, &linesize, s->blame.f);
5656 		if (linelen != -1) {
5657 			char *exstr;
5658 			err = expand_tab(&exstr, line);
5659 			if (err)
5660 				break;
5661 			if (match_line(exstr, &view->regex, 1,
5662 			    &view->regmatch)) {
5663 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5664 				s->matched_line = lineno;
5665 				free(exstr);
5666 				break;
5667 			}
5668 			free(exstr);
5669 		}
5670 		if (view->searching == TOG_SEARCH_FORWARD)
5671 			lineno++;
5672 		else
5673 			lineno--;
5674 	}
5675 	free(line);
5676 
5677 	if (s->matched_line) {
5678 		s->first_displayed_line = s->matched_line;
5679 		s->selected_line = 1;
5680 	}
5681 
5682 	return err;
5683 }
5684 
5685 static const struct got_error *
5686 show_blame_view(struct tog_view *view)
5687 {
5688 	const struct got_error *err = NULL;
5689 	struct tog_blame_view_state *s = &view->state.blame;
5690 	int errcode;
5691 
5692 	if (s->blame.thread == 0 && !s->blame_complete) {
5693 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5694 		    &s->blame.thread_args);
5695 		if (errcode)
5696 			return got_error_set_errno(errcode, "pthread_create");
5697 
5698 		halfdelay(1); /* fast refresh while annotating  */
5699 	}
5700 
5701 	if (s->blame_complete)
5702 		halfdelay(10); /* disable fast refresh */
5703 
5704 	err = draw_blame(view);
5705 
5706 	view_border(view);
5707 	return err;
5708 }
5709 
5710 static const struct got_error *
5711 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5712 {
5713 	const struct got_error *err = NULL, *thread_err = NULL;
5714 	struct tog_view *diff_view;
5715 	struct tog_blame_view_state *s = &view->state.blame;
5716 	int eos, nscroll, begin_y = 0, begin_x = 0;
5717 
5718 	eos = nscroll = view->nlines - 2;
5719 	if (view_is_hsplit_top(view))
5720 		--eos;  /* border */
5721 
5722 	switch (ch) {
5723 	case '0':
5724 		view->x = 0;
5725 		break;
5726 	case '$':
5727 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5728 		view->count = 0;
5729 		break;
5730 	case KEY_RIGHT:
5731 	case 'l':
5732 		if (view->x + view->ncols / 3 < view->maxx)
5733 			view->x += 2;  /* move two columns right */
5734 		else
5735 			view->count = 0;
5736 		break;
5737 	case KEY_LEFT:
5738 	case 'h':
5739 		view->x -= MIN(view->x, 2);  /* move two columns back */
5740 		if (view->x <= 0)
5741 			view->count = 0;
5742 		break;
5743 	case 'q':
5744 		s->done = 1;
5745 		break;
5746 	case 'g':
5747 	case KEY_HOME:
5748 		s->selected_line = 1;
5749 		s->first_displayed_line = 1;
5750 		view->count = 0;
5751 		break;
5752 	case 'G':
5753 	case KEY_END:
5754 		if (s->blame.nlines < eos) {
5755 			s->selected_line = s->blame.nlines;
5756 			s->first_displayed_line = 1;
5757 		} else {
5758 			s->selected_line = eos;
5759 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5760 		}
5761 		view->count = 0;
5762 		break;
5763 	case 'k':
5764 	case KEY_UP:
5765 	case CTRL('p'):
5766 		if (s->selected_line > 1)
5767 			s->selected_line--;
5768 		else if (s->selected_line == 1 &&
5769 		    s->first_displayed_line > 1)
5770 			s->first_displayed_line--;
5771 		else
5772 			view->count = 0;
5773 		break;
5774 	case CTRL('u'):
5775 	case 'u':
5776 		nscroll /= 2;
5777 		/* FALL THROUGH */
5778 	case KEY_PPAGE:
5779 	case CTRL('b'):
5780 	case 'b':
5781 		if (s->first_displayed_line == 1) {
5782 			if (view->count > 1)
5783 				nscroll += nscroll;
5784 			s->selected_line = MAX(1, s->selected_line - nscroll);
5785 			view->count = 0;
5786 			break;
5787 		}
5788 		if (s->first_displayed_line > nscroll)
5789 			s->first_displayed_line -= nscroll;
5790 		else
5791 			s->first_displayed_line = 1;
5792 		break;
5793 	case 'j':
5794 	case KEY_DOWN:
5795 	case CTRL('n'):
5796 		if (s->selected_line < eos && s->first_displayed_line +
5797 		    s->selected_line <= s->blame.nlines)
5798 			s->selected_line++;
5799 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5800 			s->first_displayed_line++;
5801 		else
5802 			view->count = 0;
5803 		break;
5804 	case 'c':
5805 	case 'p': {
5806 		struct got_object_id *id = NULL;
5807 
5808 		view->count = 0;
5809 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5810 		    s->first_displayed_line, s->selected_line);
5811 		if (id == NULL)
5812 			break;
5813 		if (ch == 'p') {
5814 			struct got_commit_object *commit, *pcommit;
5815 			struct got_object_qid *pid;
5816 			struct got_object_id *blob_id = NULL;
5817 			int obj_type;
5818 			err = got_object_open_as_commit(&commit,
5819 			    s->repo, id);
5820 			if (err)
5821 				break;
5822 			pid = STAILQ_FIRST(
5823 			    got_object_commit_get_parent_ids(commit));
5824 			if (pid == NULL) {
5825 				got_object_commit_close(commit);
5826 				break;
5827 			}
5828 			/* Check if path history ends here. */
5829 			err = got_object_open_as_commit(&pcommit,
5830 			    s->repo, &pid->id);
5831 			if (err)
5832 				break;
5833 			err = got_object_id_by_path(&blob_id, s->repo,
5834 			    pcommit, s->path);
5835 			got_object_commit_close(pcommit);
5836 			if (err) {
5837 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5838 					err = NULL;
5839 				got_object_commit_close(commit);
5840 				break;
5841 			}
5842 			err = got_object_get_type(&obj_type, s->repo,
5843 			    blob_id);
5844 			free(blob_id);
5845 			/* Can't blame non-blob type objects. */
5846 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5847 				got_object_commit_close(commit);
5848 				break;
5849 			}
5850 			err = got_object_qid_alloc(&s->blamed_commit,
5851 			    &pid->id);
5852 			got_object_commit_close(commit);
5853 		} else {
5854 			if (got_object_id_cmp(id,
5855 			    &s->blamed_commit->id) == 0)
5856 				break;
5857 			err = got_object_qid_alloc(&s->blamed_commit,
5858 			    id);
5859 		}
5860 		if (err)
5861 			break;
5862 		s->done = 1;
5863 		thread_err = stop_blame(&s->blame);
5864 		s->done = 0;
5865 		if (thread_err)
5866 			break;
5867 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5868 		    s->blamed_commit, entry);
5869 		err = run_blame(view);
5870 		if (err)
5871 			break;
5872 		break;
5873 	}
5874 	case 'C': {
5875 		struct got_object_qid *first;
5876 
5877 		view->count = 0;
5878 		first = STAILQ_FIRST(&s->blamed_commits);
5879 		if (!got_object_id_cmp(&first->id, s->commit_id))
5880 			break;
5881 		s->done = 1;
5882 		thread_err = stop_blame(&s->blame);
5883 		s->done = 0;
5884 		if (thread_err)
5885 			break;
5886 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5887 		got_object_qid_free(s->blamed_commit);
5888 		s->blamed_commit =
5889 		    STAILQ_FIRST(&s->blamed_commits);
5890 		err = run_blame(view);
5891 		if (err)
5892 			break;
5893 		break;
5894 	}
5895 	case KEY_ENTER:
5896 	case '\r': {
5897 		struct got_object_id *id = NULL;
5898 		struct got_object_qid *pid;
5899 		struct got_commit_object *commit = NULL;
5900 
5901 		view->count = 0;
5902 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5903 		    s->first_displayed_line, s->selected_line);
5904 		if (id == NULL)
5905 			break;
5906 		err = got_object_open_as_commit(&commit, s->repo, id);
5907 		if (err)
5908 			break;
5909 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5910 		if (*new_view) {
5911 			/* traversed from diff view, release diff resources  */
5912 			err = close_diff_view(*new_view);
5913 			if (err)
5914 				break;
5915 			diff_view = *new_view;
5916 		} else {
5917 			if (view_is_parent_view(view))
5918 				view_get_split(view, &begin_y, &begin_x);
5919 
5920 			diff_view = view_open(0, 0, begin_y, begin_x,
5921 			    TOG_VIEW_DIFF);
5922 			if (diff_view == NULL) {
5923 				got_object_commit_close(commit);
5924 				err = got_error_from_errno("view_open");
5925 				break;
5926 			}
5927 		}
5928 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5929 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
5930 		got_object_commit_close(commit);
5931 		if (err) {
5932 			view_close(diff_view);
5933 			break;
5934 		}
5935 		s->last_diffed_line = s->first_displayed_line - 1 +
5936 		    s->selected_line;
5937 		if (*new_view)
5938 			break;	/* still open from active diff view */
5939 		if (view_is_parent_view(view) &&
5940 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5941 			err = view_init_hsplit(view, begin_y);
5942 			if (err)
5943 				break;
5944 		}
5945 
5946 		view->focussed = 0;
5947 		diff_view->focussed = 1;
5948 		diff_view->mode = view->mode;
5949 		diff_view->nlines = view->lines - begin_y;
5950 		if (view_is_parent_view(view)) {
5951 			view_transfer_size(diff_view, view);
5952 			err = view_close_child(view);
5953 			if (err)
5954 				break;
5955 			err = view_set_child(view, diff_view);
5956 			if (err)
5957 				break;
5958 			view->focus_child = 1;
5959 		} else
5960 			*new_view = diff_view;
5961 		if (err)
5962 			break;
5963 		break;
5964 	}
5965 	case CTRL('d'):
5966 	case 'd':
5967 		nscroll /= 2;
5968 		/* FALL THROUGH */
5969 	case KEY_NPAGE:
5970 	case CTRL('f'):
5971 	case 'f':
5972 	case ' ':
5973 		if (s->last_displayed_line >= s->blame.nlines &&
5974 		    s->selected_line >= MIN(s->blame.nlines,
5975 		    view->nlines - 2)) {
5976 			view->count = 0;
5977 			break;
5978 		}
5979 		if (s->last_displayed_line >= s->blame.nlines &&
5980 		    s->selected_line < view->nlines - 2) {
5981 			s->selected_line +=
5982 			    MIN(nscroll, s->last_displayed_line -
5983 			    s->first_displayed_line - s->selected_line + 1);
5984 		}
5985 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5986 			s->first_displayed_line += nscroll;
5987 		else
5988 			s->first_displayed_line =
5989 			    s->blame.nlines - (view->nlines - 3);
5990 		break;
5991 	case KEY_RESIZE:
5992 		if (s->selected_line > view->nlines - 2) {
5993 			s->selected_line = MIN(s->blame.nlines,
5994 			    view->nlines - 2);
5995 		}
5996 		break;
5997 	default:
5998 		view->count = 0;
5999 		break;
6000 	}
6001 	return thread_err ? thread_err : err;
6002 }
6003 
6004 static const struct got_error *
6005 reset_blame_view(struct tog_view *view)
6006 {
6007 	const struct got_error *err;
6008 	struct tog_blame_view_state *s = &view->state.blame;
6009 
6010 	view->count = 0;
6011 	s->done = 1;
6012 	err = stop_blame(&s->blame);
6013 	s->done = 0;
6014 	if (err)
6015 		return err;
6016 	return run_blame(view);
6017 }
6018 
6019 static const struct got_error *
6020 cmd_blame(int argc, char *argv[])
6021 {
6022 	const struct got_error *error;
6023 	struct got_repository *repo = NULL;
6024 	struct got_worktree *worktree = NULL;
6025 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6026 	char *link_target = NULL;
6027 	struct got_object_id *commit_id = NULL;
6028 	struct got_commit_object *commit = NULL;
6029 	char *commit_id_str = NULL;
6030 	int ch;
6031 	struct tog_view *view;
6032 	int *pack_fds = NULL;
6033 
6034 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6035 		switch (ch) {
6036 		case 'c':
6037 			commit_id_str = optarg;
6038 			break;
6039 		case 'r':
6040 			repo_path = realpath(optarg, NULL);
6041 			if (repo_path == NULL)
6042 				return got_error_from_errno2("realpath",
6043 				    optarg);
6044 			break;
6045 		default:
6046 			usage_blame();
6047 			/* NOTREACHED */
6048 		}
6049 	}
6050 
6051 	argc -= optind;
6052 	argv += optind;
6053 
6054 	if (argc != 1)
6055 		usage_blame();
6056 
6057 	error = got_repo_pack_fds_open(&pack_fds);
6058 	if (error != NULL)
6059 		goto done;
6060 
6061 	if (repo_path == NULL) {
6062 		cwd = getcwd(NULL, 0);
6063 		if (cwd == NULL)
6064 			return got_error_from_errno("getcwd");
6065 		error = got_worktree_open(&worktree, cwd);
6066 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6067 			goto done;
6068 		if (worktree)
6069 			repo_path =
6070 			    strdup(got_worktree_get_repo_path(worktree));
6071 		else
6072 			repo_path = strdup(cwd);
6073 		if (repo_path == NULL) {
6074 			error = got_error_from_errno("strdup");
6075 			goto done;
6076 		}
6077 	}
6078 
6079 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6080 	if (error != NULL)
6081 		goto done;
6082 
6083 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6084 	    worktree);
6085 	if (error)
6086 		goto done;
6087 
6088 	init_curses();
6089 
6090 	error = apply_unveil(got_repo_get_path(repo), NULL);
6091 	if (error)
6092 		goto done;
6093 
6094 	error = tog_load_refs(repo, 0);
6095 	if (error)
6096 		goto done;
6097 
6098 	if (commit_id_str == NULL) {
6099 		struct got_reference *head_ref;
6100 		error = got_ref_open(&head_ref, repo, worktree ?
6101 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6102 		if (error != NULL)
6103 			goto done;
6104 		error = got_ref_resolve(&commit_id, repo, head_ref);
6105 		got_ref_close(head_ref);
6106 	} else {
6107 		error = got_repo_match_object_id(&commit_id, NULL,
6108 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6109 	}
6110 	if (error != NULL)
6111 		goto done;
6112 
6113 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6114 	if (view == NULL) {
6115 		error = got_error_from_errno("view_open");
6116 		goto done;
6117 	}
6118 
6119 	error = got_object_open_as_commit(&commit, repo, commit_id);
6120 	if (error)
6121 		goto done;
6122 
6123 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6124 	    commit, repo);
6125 	if (error)
6126 		goto done;
6127 
6128 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6129 	    commit_id, repo);
6130 	if (error)
6131 		goto done;
6132 	if (worktree) {
6133 		/* Release work tree lock. */
6134 		got_worktree_close(worktree);
6135 		worktree = NULL;
6136 	}
6137 	error = view_loop(view);
6138 done:
6139 	free(repo_path);
6140 	free(in_repo_path);
6141 	free(link_target);
6142 	free(cwd);
6143 	free(commit_id);
6144 	if (commit)
6145 		got_object_commit_close(commit);
6146 	if (worktree)
6147 		got_worktree_close(worktree);
6148 	if (repo) {
6149 		const struct got_error *close_err = got_repo_close(repo);
6150 		if (error == NULL)
6151 			error = close_err;
6152 	}
6153 	if (pack_fds) {
6154 		const struct got_error *pack_err =
6155 		    got_repo_pack_fds_close(pack_fds);
6156 		if (error == NULL)
6157 			error = pack_err;
6158 	}
6159 	tog_free_refs();
6160 	return error;
6161 }
6162 
6163 static const struct got_error *
6164 draw_tree_entries(struct tog_view *view, const char *parent_path)
6165 {
6166 	struct tog_tree_view_state *s = &view->state.tree;
6167 	const struct got_error *err = NULL;
6168 	struct got_tree_entry *te;
6169 	wchar_t *wline;
6170 	struct tog_color *tc;
6171 	int width, n, i, nentries;
6172 	int limit = view->nlines;
6173 
6174 	s->ndisplayed = 0;
6175 	if (view_is_hsplit_top(view))
6176 		--limit;  /* border */
6177 
6178 	werase(view->window);
6179 
6180 	if (limit == 0)
6181 		return NULL;
6182 
6183 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6184 	    0, 0);
6185 	if (err)
6186 		return err;
6187 	if (view_needs_focus_indication(view))
6188 		wstandout(view->window);
6189 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6190 	if (tc)
6191 		wattr_on(view->window,
6192 		    COLOR_PAIR(tc->colorpair), NULL);
6193 	waddwstr(view->window, wline);
6194 	if (tc)
6195 		wattr_off(view->window,
6196 		    COLOR_PAIR(tc->colorpair), NULL);
6197 	if (view_needs_focus_indication(view))
6198 		wstandend(view->window);
6199 	free(wline);
6200 	wline = NULL;
6201 	if (width < view->ncols - 1)
6202 		waddch(view->window, '\n');
6203 	if (--limit <= 0)
6204 		return NULL;
6205 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6206 	    0, 0);
6207 	if (err)
6208 		return err;
6209 	waddwstr(view->window, wline);
6210 	free(wline);
6211 	wline = NULL;
6212 	if (width < view->ncols - 1)
6213 		waddch(view->window, '\n');
6214 	if (--limit <= 0)
6215 		return NULL;
6216 	waddch(view->window, '\n');
6217 	if (--limit <= 0)
6218 		return NULL;
6219 
6220 	if (s->first_displayed_entry == NULL) {
6221 		te = got_object_tree_get_first_entry(s->tree);
6222 		if (s->selected == 0) {
6223 			if (view->focussed)
6224 				wstandout(view->window);
6225 			s->selected_entry = NULL;
6226 		}
6227 		waddstr(view->window, "  ..\n");	/* parent directory */
6228 		if (s->selected == 0 && view->focussed)
6229 			wstandend(view->window);
6230 		s->ndisplayed++;
6231 		if (--limit <= 0)
6232 			return NULL;
6233 		n = 1;
6234 	} else {
6235 		n = 0;
6236 		te = s->first_displayed_entry;
6237 	}
6238 
6239 	nentries = got_object_tree_get_nentries(s->tree);
6240 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6241 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6242 		const char *modestr = "";
6243 		mode_t mode;
6244 
6245 		te = got_object_tree_get_entry(s->tree, i);
6246 		mode = got_tree_entry_get_mode(te);
6247 
6248 		if (s->show_ids) {
6249 			err = got_object_id_str(&id_str,
6250 			    got_tree_entry_get_id(te));
6251 			if (err)
6252 				return got_error_from_errno(
6253 				    "got_object_id_str");
6254 		}
6255 		if (got_object_tree_entry_is_submodule(te))
6256 			modestr = "$";
6257 		else if (S_ISLNK(mode)) {
6258 			int i;
6259 
6260 			err = got_tree_entry_get_symlink_target(&link_target,
6261 			    te, s->repo);
6262 			if (err) {
6263 				free(id_str);
6264 				return err;
6265 			}
6266 			for (i = 0; i < strlen(link_target); i++) {
6267 				if (!isprint((unsigned char)link_target[i]))
6268 					link_target[i] = '?';
6269 			}
6270 			modestr = "@";
6271 		}
6272 		else if (S_ISDIR(mode))
6273 			modestr = "/";
6274 		else if (mode & S_IXUSR)
6275 			modestr = "*";
6276 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6277 		    got_tree_entry_get_name(te), modestr,
6278 		    link_target ? " -> ": "",
6279 		    link_target ? link_target : "") == -1) {
6280 			free(id_str);
6281 			free(link_target);
6282 			return got_error_from_errno("asprintf");
6283 		}
6284 		free(id_str);
6285 		free(link_target);
6286 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6287 		    0, 0);
6288 		if (err) {
6289 			free(line);
6290 			break;
6291 		}
6292 		if (n == s->selected) {
6293 			if (view->focussed)
6294 				wstandout(view->window);
6295 			s->selected_entry = te;
6296 		}
6297 		tc = match_color(&s->colors, line);
6298 		if (tc)
6299 			wattr_on(view->window,
6300 			    COLOR_PAIR(tc->colorpair), NULL);
6301 		waddwstr(view->window, wline);
6302 		if (tc)
6303 			wattr_off(view->window,
6304 			    COLOR_PAIR(tc->colorpair), NULL);
6305 		if (width < view->ncols - 1)
6306 			waddch(view->window, '\n');
6307 		if (n == s->selected && view->focussed)
6308 			wstandend(view->window);
6309 		free(line);
6310 		free(wline);
6311 		wline = NULL;
6312 		n++;
6313 		s->ndisplayed++;
6314 		s->last_displayed_entry = te;
6315 		if (--limit <= 0)
6316 			break;
6317 	}
6318 
6319 	return err;
6320 }
6321 
6322 static void
6323 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6324 {
6325 	struct got_tree_entry *te;
6326 	int isroot = s->tree == s->root;
6327 	int i = 0;
6328 
6329 	if (s->first_displayed_entry == NULL)
6330 		return;
6331 
6332 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6333 	while (i++ < maxscroll) {
6334 		if (te == NULL) {
6335 			if (!isroot)
6336 				s->first_displayed_entry = NULL;
6337 			break;
6338 		}
6339 		s->first_displayed_entry = te;
6340 		te = got_tree_entry_get_prev(s->tree, te);
6341 	}
6342 }
6343 
6344 static const struct got_error *
6345 tree_scroll_down(struct tog_view *view, int maxscroll)
6346 {
6347 	struct tog_tree_view_state *s = &view->state.tree;
6348 	struct got_tree_entry *next, *last;
6349 	int n = 0;
6350 
6351 	if (s->first_displayed_entry)
6352 		next = got_tree_entry_get_next(s->tree,
6353 		    s->first_displayed_entry);
6354 	else
6355 		next = got_object_tree_get_first_entry(s->tree);
6356 
6357 	last = s->last_displayed_entry;
6358 	while (next && n++ < maxscroll) {
6359 		if (last)
6360 			last = got_tree_entry_get_next(s->tree, last);
6361 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6362 			s->first_displayed_entry = next;
6363 			next = got_tree_entry_get_next(s->tree, next);
6364 		}
6365 	}
6366 
6367 	return NULL;
6368 }
6369 
6370 static const struct got_error *
6371 tree_entry_path(char **path, struct tog_parent_trees *parents,
6372     struct got_tree_entry *te)
6373 {
6374 	const struct got_error *err = NULL;
6375 	struct tog_parent_tree *pt;
6376 	size_t len = 2; /* for leading slash and NUL */
6377 
6378 	TAILQ_FOREACH(pt, parents, entry)
6379 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6380 		    + 1 /* slash */;
6381 	if (te)
6382 		len += strlen(got_tree_entry_get_name(te));
6383 
6384 	*path = calloc(1, len);
6385 	if (path == NULL)
6386 		return got_error_from_errno("calloc");
6387 
6388 	(*path)[0] = '/';
6389 	pt = TAILQ_LAST(parents, tog_parent_trees);
6390 	while (pt) {
6391 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6392 		if (strlcat(*path, name, len) >= len) {
6393 			err = got_error(GOT_ERR_NO_SPACE);
6394 			goto done;
6395 		}
6396 		if (strlcat(*path, "/", len) >= len) {
6397 			err = got_error(GOT_ERR_NO_SPACE);
6398 			goto done;
6399 		}
6400 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6401 	}
6402 	if (te) {
6403 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6404 			err = got_error(GOT_ERR_NO_SPACE);
6405 			goto done;
6406 		}
6407 	}
6408 done:
6409 	if (err) {
6410 		free(*path);
6411 		*path = NULL;
6412 	}
6413 	return err;
6414 }
6415 
6416 static const struct got_error *
6417 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6418     struct got_tree_entry *te, struct tog_parent_trees *parents,
6419     struct got_object_id *commit_id, struct got_repository *repo)
6420 {
6421 	const struct got_error *err = NULL;
6422 	char *path;
6423 	struct tog_view *blame_view;
6424 
6425 	*new_view = NULL;
6426 
6427 	err = tree_entry_path(&path, parents, te);
6428 	if (err)
6429 		return err;
6430 
6431 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6432 	if (blame_view == NULL) {
6433 		err = got_error_from_errno("view_open");
6434 		goto done;
6435 	}
6436 
6437 	err = open_blame_view(blame_view, path, commit_id, repo);
6438 	if (err) {
6439 		if (err->code == GOT_ERR_CANCELLED)
6440 			err = NULL;
6441 		view_close(blame_view);
6442 	} else
6443 		*new_view = blame_view;
6444 done:
6445 	free(path);
6446 	return err;
6447 }
6448 
6449 static const struct got_error *
6450 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6451     struct tog_tree_view_state *s)
6452 {
6453 	struct tog_view *log_view;
6454 	const struct got_error *err = NULL;
6455 	char *path;
6456 
6457 	*new_view = NULL;
6458 
6459 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6460 	if (log_view == NULL)
6461 		return got_error_from_errno("view_open");
6462 
6463 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6464 	if (err)
6465 		return err;
6466 
6467 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6468 	    path, 0);
6469 	if (err)
6470 		view_close(log_view);
6471 	else
6472 		*new_view = log_view;
6473 	free(path);
6474 	return err;
6475 }
6476 
6477 static const struct got_error *
6478 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6479     const char *head_ref_name, struct got_repository *repo)
6480 {
6481 	const struct got_error *err = NULL;
6482 	char *commit_id_str = NULL;
6483 	struct tog_tree_view_state *s = &view->state.tree;
6484 	struct got_commit_object *commit = NULL;
6485 
6486 	TAILQ_INIT(&s->parents);
6487 	STAILQ_INIT(&s->colors);
6488 
6489 	s->commit_id = got_object_id_dup(commit_id);
6490 	if (s->commit_id == NULL)
6491 		return got_error_from_errno("got_object_id_dup");
6492 
6493 	err = got_object_open_as_commit(&commit, repo, commit_id);
6494 	if (err)
6495 		goto done;
6496 
6497 	/*
6498 	 * The root is opened here and will be closed when the view is closed.
6499 	 * Any visited subtrees and their path-wise parents are opened and
6500 	 * closed on demand.
6501 	 */
6502 	err = got_object_open_as_tree(&s->root, repo,
6503 	    got_object_commit_get_tree_id(commit));
6504 	if (err)
6505 		goto done;
6506 	s->tree = s->root;
6507 
6508 	err = got_object_id_str(&commit_id_str, commit_id);
6509 	if (err != NULL)
6510 		goto done;
6511 
6512 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6513 		err = got_error_from_errno("asprintf");
6514 		goto done;
6515 	}
6516 
6517 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6518 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6519 	if (head_ref_name) {
6520 		s->head_ref_name = strdup(head_ref_name);
6521 		if (s->head_ref_name == NULL) {
6522 			err = got_error_from_errno("strdup");
6523 			goto done;
6524 		}
6525 	}
6526 	s->repo = repo;
6527 
6528 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6529 		err = add_color(&s->colors, "\\$$",
6530 		    TOG_COLOR_TREE_SUBMODULE,
6531 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6532 		if (err)
6533 			goto done;
6534 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6535 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6536 		if (err)
6537 			goto done;
6538 		err = add_color(&s->colors, "/$",
6539 		    TOG_COLOR_TREE_DIRECTORY,
6540 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6541 		if (err)
6542 			goto done;
6543 
6544 		err = add_color(&s->colors, "\\*$",
6545 		    TOG_COLOR_TREE_EXECUTABLE,
6546 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6547 		if (err)
6548 			goto done;
6549 
6550 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6551 		    get_color_value("TOG_COLOR_COMMIT"));
6552 		if (err)
6553 			goto done;
6554 	}
6555 
6556 	view->show = show_tree_view;
6557 	view->input = input_tree_view;
6558 	view->close = close_tree_view;
6559 	view->search_start = search_start_tree_view;
6560 	view->search_next = search_next_tree_view;
6561 done:
6562 	free(commit_id_str);
6563 	if (commit)
6564 		got_object_commit_close(commit);
6565 	if (err)
6566 		close_tree_view(view);
6567 	return err;
6568 }
6569 
6570 static const struct got_error *
6571 close_tree_view(struct tog_view *view)
6572 {
6573 	struct tog_tree_view_state *s = &view->state.tree;
6574 
6575 	free_colors(&s->colors);
6576 	free(s->tree_label);
6577 	s->tree_label = NULL;
6578 	free(s->commit_id);
6579 	s->commit_id = NULL;
6580 	free(s->head_ref_name);
6581 	s->head_ref_name = NULL;
6582 	while (!TAILQ_EMPTY(&s->parents)) {
6583 		struct tog_parent_tree *parent;
6584 		parent = TAILQ_FIRST(&s->parents);
6585 		TAILQ_REMOVE(&s->parents, parent, entry);
6586 		if (parent->tree != s->root)
6587 			got_object_tree_close(parent->tree);
6588 		free(parent);
6589 
6590 	}
6591 	if (s->tree != NULL && s->tree != s->root)
6592 		got_object_tree_close(s->tree);
6593 	if (s->root)
6594 		got_object_tree_close(s->root);
6595 	return NULL;
6596 }
6597 
6598 static const struct got_error *
6599 search_start_tree_view(struct tog_view *view)
6600 {
6601 	struct tog_tree_view_state *s = &view->state.tree;
6602 
6603 	s->matched_entry = NULL;
6604 	return NULL;
6605 }
6606 
6607 static int
6608 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6609 {
6610 	regmatch_t regmatch;
6611 
6612 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6613 	    0) == 0;
6614 }
6615 
6616 static const struct got_error *
6617 search_next_tree_view(struct tog_view *view)
6618 {
6619 	struct tog_tree_view_state *s = &view->state.tree;
6620 	struct got_tree_entry *te = NULL;
6621 
6622 	if (!view->searching) {
6623 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6624 		return NULL;
6625 	}
6626 
6627 	if (s->matched_entry) {
6628 		if (view->searching == TOG_SEARCH_FORWARD) {
6629 			if (s->selected_entry)
6630 				te = got_tree_entry_get_next(s->tree,
6631 				    s->selected_entry);
6632 			else
6633 				te = got_object_tree_get_first_entry(s->tree);
6634 		} else {
6635 			if (s->selected_entry == NULL)
6636 				te = got_object_tree_get_last_entry(s->tree);
6637 			else
6638 				te = got_tree_entry_get_prev(s->tree,
6639 				    s->selected_entry);
6640 		}
6641 	} else {
6642 		if (s->selected_entry)
6643 			te = s->selected_entry;
6644 		else if (view->searching == TOG_SEARCH_FORWARD)
6645 			te = got_object_tree_get_first_entry(s->tree);
6646 		else
6647 			te = got_object_tree_get_last_entry(s->tree);
6648 	}
6649 
6650 	while (1) {
6651 		if (te == NULL) {
6652 			if (s->matched_entry == NULL) {
6653 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6654 				return NULL;
6655 			}
6656 			if (view->searching == TOG_SEARCH_FORWARD)
6657 				te = got_object_tree_get_first_entry(s->tree);
6658 			else
6659 				te = got_object_tree_get_last_entry(s->tree);
6660 		}
6661 
6662 		if (match_tree_entry(te, &view->regex)) {
6663 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6664 			s->matched_entry = te;
6665 			break;
6666 		}
6667 
6668 		if (view->searching == TOG_SEARCH_FORWARD)
6669 			te = got_tree_entry_get_next(s->tree, te);
6670 		else
6671 			te = got_tree_entry_get_prev(s->tree, te);
6672 	}
6673 
6674 	if (s->matched_entry) {
6675 		s->first_displayed_entry = s->matched_entry;
6676 		s->selected = 0;
6677 	}
6678 
6679 	return NULL;
6680 }
6681 
6682 static const struct got_error *
6683 show_tree_view(struct tog_view *view)
6684 {
6685 	const struct got_error *err = NULL;
6686 	struct tog_tree_view_state *s = &view->state.tree;
6687 	char *parent_path;
6688 
6689 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6690 	if (err)
6691 		return err;
6692 
6693 	err = draw_tree_entries(view, parent_path);
6694 	free(parent_path);
6695 
6696 	view_border(view);
6697 	return err;
6698 }
6699 
6700 static const struct got_error *
6701 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6702 {
6703 	const struct got_error *err = NULL;
6704 	struct tog_tree_view_state *s = &view->state.tree;
6705 	struct tog_view *log_view, *ref_view;
6706 	struct got_tree_entry *te;
6707 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6708 
6709 	switch (ch) {
6710 	case 'i':
6711 		s->show_ids = !s->show_ids;
6712 		view->count = 0;
6713 		break;
6714 	case 'l':
6715 		view->count = 0;
6716 		if (!s->selected_entry)
6717 			break;
6718 		if (view_is_parent_view(view))
6719 			view_get_split(view, &begin_y, &begin_x);
6720 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6721 		if (view_is_parent_view(view) &&
6722 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6723 			err = view_init_hsplit(view, begin_y);
6724 			if (err)
6725 				break;
6726 		}
6727 		view->focussed = 0;
6728 		log_view->focussed = 1;
6729 		log_view->mode = view->mode;
6730 		log_view->nlines = view->lines - begin_y;
6731 		if (view_is_parent_view(view)) {
6732 			view_transfer_size(log_view, view);
6733 			err = view_close_child(view);
6734 			if (err)
6735 				return err;
6736 			err = view_set_child(view, log_view);
6737 			if (err)
6738 				return err;
6739 			view->focus_child = 1;
6740 		} else
6741 			*new_view = log_view;
6742 		break;
6743 	case 'r':
6744 		view->count = 0;
6745 		if (view_is_parent_view(view))
6746 			view_get_split(view, &begin_y, &begin_x);
6747 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6748 		if (ref_view == NULL)
6749 			return got_error_from_errno("view_open");
6750 		err = open_ref_view(ref_view, s->repo);
6751 		if (err) {
6752 			view_close(ref_view);
6753 			return err;
6754 		}
6755 		if (view_is_parent_view(view) &&
6756 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6757 			err = view_init_hsplit(view, begin_y);
6758 			if (err)
6759 				break;
6760 		}
6761 		view->focussed = 0;
6762 		ref_view->focussed = 1;
6763 		ref_view->mode = view->mode;
6764 		ref_view->nlines = view->lines - begin_y;
6765 		if (view_is_parent_view(view)) {
6766 			view_transfer_size(ref_view, view);
6767 			err = view_close_child(view);
6768 			if (err)
6769 				return err;
6770 			err = view_set_child(view, ref_view);
6771 			if (err)
6772 				return err;
6773 			view->focus_child = 1;
6774 		} else
6775 			*new_view = ref_view;
6776 		break;
6777 	case 'g':
6778 	case KEY_HOME:
6779 		s->selected = 0;
6780 		view->count = 0;
6781 		if (s->tree == s->root)
6782 			s->first_displayed_entry =
6783 			    got_object_tree_get_first_entry(s->tree);
6784 		else
6785 			s->first_displayed_entry = NULL;
6786 		break;
6787 	case 'G':
6788 	case KEY_END: {
6789 		int eos = view->nlines - 3;
6790 
6791 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6792 			--eos;  /* border */
6793 		s->selected = 0;
6794 		view->count = 0;
6795 		te = got_object_tree_get_last_entry(s->tree);
6796 		for (n = 0; n < eos; n++) {
6797 			if (te == NULL) {
6798 				if(s->tree != s->root) {
6799 					s->first_displayed_entry = NULL;
6800 					n++;
6801 				}
6802 				break;
6803 			}
6804 			s->first_displayed_entry = te;
6805 			te = got_tree_entry_get_prev(s->tree, te);
6806 		}
6807 		if (n > 0)
6808 			s->selected = n - 1;
6809 		break;
6810 	}
6811 	case 'k':
6812 	case KEY_UP:
6813 	case CTRL('p'):
6814 		if (s->selected > 0) {
6815 			s->selected--;
6816 			break;
6817 		}
6818 		tree_scroll_up(s, 1);
6819 		if (s->selected_entry == NULL ||
6820 		    (s->tree == s->root && s->selected_entry ==
6821 		     got_object_tree_get_first_entry(s->tree)))
6822 			view->count = 0;
6823 		break;
6824 	case CTRL('u'):
6825 	case 'u':
6826 		nscroll /= 2;
6827 		/* FALL THROUGH */
6828 	case KEY_PPAGE:
6829 	case CTRL('b'):
6830 	case 'b':
6831 		if (s->tree == s->root) {
6832 			if (got_object_tree_get_first_entry(s->tree) ==
6833 			    s->first_displayed_entry)
6834 				s->selected -= MIN(s->selected, nscroll);
6835 		} else {
6836 			if (s->first_displayed_entry == NULL)
6837 				s->selected -= MIN(s->selected, nscroll);
6838 		}
6839 		tree_scroll_up(s, MAX(0, nscroll));
6840 		if (s->selected_entry == NULL ||
6841 		    (s->tree == s->root && s->selected_entry ==
6842 		     got_object_tree_get_first_entry(s->tree)))
6843 			view->count = 0;
6844 		break;
6845 	case 'j':
6846 	case KEY_DOWN:
6847 	case CTRL('n'):
6848 		if (s->selected < s->ndisplayed - 1) {
6849 			s->selected++;
6850 			break;
6851 		}
6852 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6853 		    == NULL) {
6854 			/* can't scroll any further */
6855 			view->count = 0;
6856 			break;
6857 		}
6858 		tree_scroll_down(view, 1);
6859 		break;
6860 	case CTRL('d'):
6861 	case 'd':
6862 		nscroll /= 2;
6863 		/* FALL THROUGH */
6864 	case KEY_NPAGE:
6865 	case CTRL('f'):
6866 	case 'f':
6867 	case ' ':
6868 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6869 		    == NULL) {
6870 			/* can't scroll any further; move cursor down */
6871 			if (s->selected < s->ndisplayed - 1)
6872 				s->selected += MIN(nscroll,
6873 				    s->ndisplayed - s->selected - 1);
6874 			else
6875 				view->count = 0;
6876 			break;
6877 		}
6878 		tree_scroll_down(view, nscroll);
6879 		break;
6880 	case KEY_ENTER:
6881 	case '\r':
6882 	case KEY_BACKSPACE:
6883 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6884 			struct tog_parent_tree *parent;
6885 			/* user selected '..' */
6886 			if (s->tree == s->root) {
6887 				view->count = 0;
6888 				break;
6889 			}
6890 			parent = TAILQ_FIRST(&s->parents);
6891 			TAILQ_REMOVE(&s->parents, parent,
6892 			    entry);
6893 			got_object_tree_close(s->tree);
6894 			s->tree = parent->tree;
6895 			s->first_displayed_entry =
6896 			    parent->first_displayed_entry;
6897 			s->selected_entry =
6898 			    parent->selected_entry;
6899 			s->selected = parent->selected;
6900 			if (s->selected > view->nlines - 3) {
6901 				err = offset_selection_down(view);
6902 				if (err)
6903 					break;
6904 			}
6905 			free(parent);
6906 		} else if (S_ISDIR(got_tree_entry_get_mode(
6907 		    s->selected_entry))) {
6908 			struct got_tree_object *subtree;
6909 			view->count = 0;
6910 			err = got_object_open_as_tree(&subtree, s->repo,
6911 			    got_tree_entry_get_id(s->selected_entry));
6912 			if (err)
6913 				break;
6914 			err = tree_view_visit_subtree(s, subtree);
6915 			if (err) {
6916 				got_object_tree_close(subtree);
6917 				break;
6918 			}
6919 		} else if (S_ISREG(got_tree_entry_get_mode(
6920 		    s->selected_entry))) {
6921 			struct tog_view *blame_view;
6922 			int begin_x = 0, begin_y = 0;
6923 
6924 			if (view_is_parent_view(view))
6925 				view_get_split(view, &begin_y, &begin_x);
6926 
6927 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6928 			    s->selected_entry, &s->parents,
6929 			    s->commit_id, s->repo);
6930 			if (err)
6931 				break;
6932 
6933 			if (view_is_parent_view(view) &&
6934 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
6935 				err = view_init_hsplit(view, begin_y);
6936 				if (err)
6937 					break;
6938 			}
6939 
6940 			view->count = 0;
6941 			view->focussed = 0;
6942 			blame_view->focussed = 1;
6943 			blame_view->mode = view->mode;
6944 			blame_view->nlines = view->lines - begin_y;
6945 			if (view_is_parent_view(view)) {
6946 				view_transfer_size(blame_view, view);
6947 				err = view_close_child(view);
6948 				if (err)
6949 					return err;
6950 				err = view_set_child(view, blame_view);
6951 				if (err)
6952 					return err;
6953 				view->focus_child = 1;
6954 			} else
6955 				*new_view = blame_view;
6956 		}
6957 		break;
6958 	case KEY_RESIZE:
6959 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6960 			s->selected = view->nlines - 4;
6961 		view->count = 0;
6962 		break;
6963 	default:
6964 		view->count = 0;
6965 		break;
6966 	}
6967 
6968 	return err;
6969 }
6970 
6971 __dead static void
6972 usage_tree(void)
6973 {
6974 	endwin();
6975 	fprintf(stderr,
6976 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6977 	    getprogname());
6978 	exit(1);
6979 }
6980 
6981 static const struct got_error *
6982 cmd_tree(int argc, char *argv[])
6983 {
6984 	const struct got_error *error;
6985 	struct got_repository *repo = NULL;
6986 	struct got_worktree *worktree = NULL;
6987 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6988 	struct got_object_id *commit_id = NULL;
6989 	struct got_commit_object *commit = NULL;
6990 	const char *commit_id_arg = NULL;
6991 	char *label = NULL;
6992 	struct got_reference *ref = NULL;
6993 	const char *head_ref_name = NULL;
6994 	int ch;
6995 	struct tog_view *view;
6996 	int *pack_fds = NULL;
6997 
6998 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6999 		switch (ch) {
7000 		case 'c':
7001 			commit_id_arg = optarg;
7002 			break;
7003 		case 'r':
7004 			repo_path = realpath(optarg, NULL);
7005 			if (repo_path == NULL)
7006 				return got_error_from_errno2("realpath",
7007 				    optarg);
7008 			break;
7009 		default:
7010 			usage_tree();
7011 			/* NOTREACHED */
7012 		}
7013 	}
7014 
7015 	argc -= optind;
7016 	argv += optind;
7017 
7018 	if (argc > 1)
7019 		usage_tree();
7020 
7021 	error = got_repo_pack_fds_open(&pack_fds);
7022 	if (error != NULL)
7023 		goto done;
7024 
7025 	if (repo_path == NULL) {
7026 		cwd = getcwd(NULL, 0);
7027 		if (cwd == NULL)
7028 			return got_error_from_errno("getcwd");
7029 		error = got_worktree_open(&worktree, cwd);
7030 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7031 			goto done;
7032 		if (worktree)
7033 			repo_path =
7034 			    strdup(got_worktree_get_repo_path(worktree));
7035 		else
7036 			repo_path = strdup(cwd);
7037 		if (repo_path == NULL) {
7038 			error = got_error_from_errno("strdup");
7039 			goto done;
7040 		}
7041 	}
7042 
7043 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7044 	if (error != NULL)
7045 		goto done;
7046 
7047 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7048 	    repo, worktree);
7049 	if (error)
7050 		goto done;
7051 
7052 	init_curses();
7053 
7054 	error = apply_unveil(got_repo_get_path(repo), NULL);
7055 	if (error)
7056 		goto done;
7057 
7058 	error = tog_load_refs(repo, 0);
7059 	if (error)
7060 		goto done;
7061 
7062 	if (commit_id_arg == NULL) {
7063 		error = got_repo_match_object_id(&commit_id, &label,
7064 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7065 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7066 		if (error)
7067 			goto done;
7068 		head_ref_name = label;
7069 	} else {
7070 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7071 		if (error == NULL)
7072 			head_ref_name = got_ref_get_name(ref);
7073 		else if (error->code != GOT_ERR_NOT_REF)
7074 			goto done;
7075 		error = got_repo_match_object_id(&commit_id, NULL,
7076 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7077 		if (error)
7078 			goto done;
7079 	}
7080 
7081 	error = got_object_open_as_commit(&commit, repo, commit_id);
7082 	if (error)
7083 		goto done;
7084 
7085 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7086 	if (view == NULL) {
7087 		error = got_error_from_errno("view_open");
7088 		goto done;
7089 	}
7090 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7091 	if (error)
7092 		goto done;
7093 	if (!got_path_is_root_dir(in_repo_path)) {
7094 		error = tree_view_walk_path(&view->state.tree, commit,
7095 		    in_repo_path);
7096 		if (error)
7097 			goto done;
7098 	}
7099 
7100 	if (worktree) {
7101 		/* Release work tree lock. */
7102 		got_worktree_close(worktree);
7103 		worktree = NULL;
7104 	}
7105 	error = view_loop(view);
7106 done:
7107 	free(repo_path);
7108 	free(cwd);
7109 	free(commit_id);
7110 	free(label);
7111 	if (ref)
7112 		got_ref_close(ref);
7113 	if (repo) {
7114 		const struct got_error *close_err = got_repo_close(repo);
7115 		if (error == NULL)
7116 			error = close_err;
7117 	}
7118 	if (pack_fds) {
7119 		const struct got_error *pack_err =
7120 		    got_repo_pack_fds_close(pack_fds);
7121 		if (error == NULL)
7122 			error = pack_err;
7123 	}
7124 	tog_free_refs();
7125 	return error;
7126 }
7127 
7128 static const struct got_error *
7129 ref_view_load_refs(struct tog_ref_view_state *s)
7130 {
7131 	struct got_reflist_entry *sre;
7132 	struct tog_reflist_entry *re;
7133 
7134 	s->nrefs = 0;
7135 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7136 		if (strncmp(got_ref_get_name(sre->ref),
7137 		    "refs/got/", 9) == 0 &&
7138 		    strncmp(got_ref_get_name(sre->ref),
7139 		    "refs/got/backup/", 16) != 0)
7140 			continue;
7141 
7142 		re = malloc(sizeof(*re));
7143 		if (re == NULL)
7144 			return got_error_from_errno("malloc");
7145 
7146 		re->ref = got_ref_dup(sre->ref);
7147 		if (re->ref == NULL)
7148 			return got_error_from_errno("got_ref_dup");
7149 		re->idx = s->nrefs++;
7150 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7151 	}
7152 
7153 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7154 	return NULL;
7155 }
7156 
7157 static void
7158 ref_view_free_refs(struct tog_ref_view_state *s)
7159 {
7160 	struct tog_reflist_entry *re;
7161 
7162 	while (!TAILQ_EMPTY(&s->refs)) {
7163 		re = TAILQ_FIRST(&s->refs);
7164 		TAILQ_REMOVE(&s->refs, re, entry);
7165 		got_ref_close(re->ref);
7166 		free(re);
7167 	}
7168 }
7169 
7170 static const struct got_error *
7171 open_ref_view(struct tog_view *view, struct got_repository *repo)
7172 {
7173 	const struct got_error *err = NULL;
7174 	struct tog_ref_view_state *s = &view->state.ref;
7175 
7176 	s->selected_entry = 0;
7177 	s->repo = repo;
7178 
7179 	TAILQ_INIT(&s->refs);
7180 	STAILQ_INIT(&s->colors);
7181 
7182 	err = ref_view_load_refs(s);
7183 	if (err)
7184 		return err;
7185 
7186 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7187 		err = add_color(&s->colors, "^refs/heads/",
7188 		    TOG_COLOR_REFS_HEADS,
7189 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7190 		if (err)
7191 			goto done;
7192 
7193 		err = add_color(&s->colors, "^refs/tags/",
7194 		    TOG_COLOR_REFS_TAGS,
7195 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7196 		if (err)
7197 			goto done;
7198 
7199 		err = add_color(&s->colors, "^refs/remotes/",
7200 		    TOG_COLOR_REFS_REMOTES,
7201 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7202 		if (err)
7203 			goto done;
7204 
7205 		err = add_color(&s->colors, "^refs/got/backup/",
7206 		    TOG_COLOR_REFS_BACKUP,
7207 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7208 		if (err)
7209 			goto done;
7210 	}
7211 
7212 	view->show = show_ref_view;
7213 	view->input = input_ref_view;
7214 	view->close = close_ref_view;
7215 	view->search_start = search_start_ref_view;
7216 	view->search_next = search_next_ref_view;
7217 done:
7218 	if (err)
7219 		free_colors(&s->colors);
7220 	return err;
7221 }
7222 
7223 static const struct got_error *
7224 close_ref_view(struct tog_view *view)
7225 {
7226 	struct tog_ref_view_state *s = &view->state.ref;
7227 
7228 	ref_view_free_refs(s);
7229 	free_colors(&s->colors);
7230 
7231 	return NULL;
7232 }
7233 
7234 static const struct got_error *
7235 resolve_reflist_entry(struct got_object_id **commit_id,
7236     struct tog_reflist_entry *re, struct got_repository *repo)
7237 {
7238 	const struct got_error *err = NULL;
7239 	struct got_object_id *obj_id;
7240 	struct got_tag_object *tag = NULL;
7241 	int obj_type;
7242 
7243 	*commit_id = NULL;
7244 
7245 	err = got_ref_resolve(&obj_id, repo, re->ref);
7246 	if (err)
7247 		return err;
7248 
7249 	err = got_object_get_type(&obj_type, repo, obj_id);
7250 	if (err)
7251 		goto done;
7252 
7253 	switch (obj_type) {
7254 	case GOT_OBJ_TYPE_COMMIT:
7255 		*commit_id = obj_id;
7256 		break;
7257 	case GOT_OBJ_TYPE_TAG:
7258 		err = got_object_open_as_tag(&tag, repo, obj_id);
7259 		if (err)
7260 			goto done;
7261 		free(obj_id);
7262 		err = got_object_get_type(&obj_type, repo,
7263 		    got_object_tag_get_object_id(tag));
7264 		if (err)
7265 			goto done;
7266 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7267 			err = got_error(GOT_ERR_OBJ_TYPE);
7268 			goto done;
7269 		}
7270 		*commit_id = got_object_id_dup(
7271 		    got_object_tag_get_object_id(tag));
7272 		if (*commit_id == NULL) {
7273 			err = got_error_from_errno("got_object_id_dup");
7274 			goto done;
7275 		}
7276 		break;
7277 	default:
7278 		err = got_error(GOT_ERR_OBJ_TYPE);
7279 		break;
7280 	}
7281 
7282 done:
7283 	if (tag)
7284 		got_object_tag_close(tag);
7285 	if (err) {
7286 		free(*commit_id);
7287 		*commit_id = NULL;
7288 	}
7289 	return err;
7290 }
7291 
7292 static const struct got_error *
7293 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7294     struct tog_reflist_entry *re, struct got_repository *repo)
7295 {
7296 	struct tog_view *log_view;
7297 	const struct got_error *err = NULL;
7298 	struct got_object_id *commit_id = NULL;
7299 
7300 	*new_view = NULL;
7301 
7302 	err = resolve_reflist_entry(&commit_id, re, repo);
7303 	if (err) {
7304 		if (err->code != GOT_ERR_OBJ_TYPE)
7305 			return err;
7306 		else
7307 			return NULL;
7308 	}
7309 
7310 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7311 	if (log_view == NULL) {
7312 		err = got_error_from_errno("view_open");
7313 		goto done;
7314 	}
7315 
7316 	err = open_log_view(log_view, commit_id, repo,
7317 	    got_ref_get_name(re->ref), "", 0);
7318 done:
7319 	if (err)
7320 		view_close(log_view);
7321 	else
7322 		*new_view = log_view;
7323 	free(commit_id);
7324 	return err;
7325 }
7326 
7327 static void
7328 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7329 {
7330 	struct tog_reflist_entry *re;
7331 	int i = 0;
7332 
7333 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7334 		return;
7335 
7336 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7337 	while (i++ < maxscroll) {
7338 		if (re == NULL)
7339 			break;
7340 		s->first_displayed_entry = re;
7341 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7342 	}
7343 }
7344 
7345 static const struct got_error *
7346 ref_scroll_down(struct tog_view *view, int maxscroll)
7347 {
7348 	struct tog_ref_view_state *s = &view->state.ref;
7349 	struct tog_reflist_entry *next, *last;
7350 	int n = 0;
7351 
7352 	if (s->first_displayed_entry)
7353 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7354 	else
7355 		next = TAILQ_FIRST(&s->refs);
7356 
7357 	last = s->last_displayed_entry;
7358 	while (next && n++ < maxscroll) {
7359 		if (last)
7360 			last = TAILQ_NEXT(last, entry);
7361 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7362 			s->first_displayed_entry = next;
7363 			next = TAILQ_NEXT(next, entry);
7364 		}
7365 	}
7366 
7367 	return NULL;
7368 }
7369 
7370 static const struct got_error *
7371 search_start_ref_view(struct tog_view *view)
7372 {
7373 	struct tog_ref_view_state *s = &view->state.ref;
7374 
7375 	s->matched_entry = NULL;
7376 	return NULL;
7377 }
7378 
7379 static int
7380 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7381 {
7382 	regmatch_t regmatch;
7383 
7384 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7385 	    0) == 0;
7386 }
7387 
7388 static const struct got_error *
7389 search_next_ref_view(struct tog_view *view)
7390 {
7391 	struct tog_ref_view_state *s = &view->state.ref;
7392 	struct tog_reflist_entry *re = NULL;
7393 
7394 	if (!view->searching) {
7395 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7396 		return NULL;
7397 	}
7398 
7399 	if (s->matched_entry) {
7400 		if (view->searching == TOG_SEARCH_FORWARD) {
7401 			if (s->selected_entry)
7402 				re = TAILQ_NEXT(s->selected_entry, entry);
7403 			else
7404 				re = TAILQ_PREV(s->selected_entry,
7405 				    tog_reflist_head, entry);
7406 		} else {
7407 			if (s->selected_entry == NULL)
7408 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7409 			else
7410 				re = TAILQ_PREV(s->selected_entry,
7411 				    tog_reflist_head, entry);
7412 		}
7413 	} else {
7414 		if (s->selected_entry)
7415 			re = s->selected_entry;
7416 		else if (view->searching == TOG_SEARCH_FORWARD)
7417 			re = TAILQ_FIRST(&s->refs);
7418 		else
7419 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7420 	}
7421 
7422 	while (1) {
7423 		if (re == NULL) {
7424 			if (s->matched_entry == NULL) {
7425 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7426 				return NULL;
7427 			}
7428 			if (view->searching == TOG_SEARCH_FORWARD)
7429 				re = TAILQ_FIRST(&s->refs);
7430 			else
7431 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7432 		}
7433 
7434 		if (match_reflist_entry(re, &view->regex)) {
7435 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7436 			s->matched_entry = re;
7437 			break;
7438 		}
7439 
7440 		if (view->searching == TOG_SEARCH_FORWARD)
7441 			re = TAILQ_NEXT(re, entry);
7442 		else
7443 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7444 	}
7445 
7446 	if (s->matched_entry) {
7447 		s->first_displayed_entry = s->matched_entry;
7448 		s->selected = 0;
7449 	}
7450 
7451 	return NULL;
7452 }
7453 
7454 static const struct got_error *
7455 show_ref_view(struct tog_view *view)
7456 {
7457 	const struct got_error *err = NULL;
7458 	struct tog_ref_view_state *s = &view->state.ref;
7459 	struct tog_reflist_entry *re;
7460 	char *line = NULL;
7461 	wchar_t *wline;
7462 	struct tog_color *tc;
7463 	int width, n;
7464 	int limit = view->nlines;
7465 
7466 	werase(view->window);
7467 
7468 	s->ndisplayed = 0;
7469 	if (view_is_hsplit_top(view))
7470 		--limit;  /* border */
7471 
7472 	if (limit == 0)
7473 		return NULL;
7474 
7475 	re = s->first_displayed_entry;
7476 
7477 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7478 	    s->nrefs) == -1)
7479 		return got_error_from_errno("asprintf");
7480 
7481 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7482 	if (err) {
7483 		free(line);
7484 		return err;
7485 	}
7486 	if (view_needs_focus_indication(view))
7487 		wstandout(view->window);
7488 	waddwstr(view->window, wline);
7489 	if (view_needs_focus_indication(view))
7490 		wstandend(view->window);
7491 	free(wline);
7492 	wline = NULL;
7493 	free(line);
7494 	line = NULL;
7495 	if (width < view->ncols - 1)
7496 		waddch(view->window, '\n');
7497 	if (--limit <= 0)
7498 		return NULL;
7499 
7500 	n = 0;
7501 	while (re && limit > 0) {
7502 		char *line = NULL;
7503 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7504 
7505 		if (s->show_date) {
7506 			struct got_commit_object *ci;
7507 			struct got_tag_object *tag;
7508 			struct got_object_id *id;
7509 			struct tm tm;
7510 			time_t t;
7511 
7512 			err = got_ref_resolve(&id, s->repo, re->ref);
7513 			if (err)
7514 				return err;
7515 			err = got_object_open_as_tag(&tag, s->repo, id);
7516 			if (err) {
7517 				if (err->code != GOT_ERR_OBJ_TYPE) {
7518 					free(id);
7519 					return err;
7520 				}
7521 				err = got_object_open_as_commit(&ci, s->repo,
7522 				    id);
7523 				if (err) {
7524 					free(id);
7525 					return err;
7526 				}
7527 				t = got_object_commit_get_committer_time(ci);
7528 				got_object_commit_close(ci);
7529 			} else {
7530 				t = got_object_tag_get_tagger_time(tag);
7531 				got_object_tag_close(tag);
7532 			}
7533 			free(id);
7534 			if (gmtime_r(&t, &tm) == NULL)
7535 				return got_error_from_errno("gmtime_r");
7536 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7537 				return got_error(GOT_ERR_NO_SPACE);
7538 		}
7539 		if (got_ref_is_symbolic(re->ref)) {
7540 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7541 			    ymd : "", got_ref_get_name(re->ref),
7542 			    got_ref_get_symref_target(re->ref)) == -1)
7543 				return got_error_from_errno("asprintf");
7544 		} else if (s->show_ids) {
7545 			struct got_object_id *id;
7546 			char *id_str;
7547 			err = got_ref_resolve(&id, s->repo, re->ref);
7548 			if (err)
7549 				return err;
7550 			err = got_object_id_str(&id_str, id);
7551 			if (err) {
7552 				free(id);
7553 				return err;
7554 			}
7555 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7556 			    got_ref_get_name(re->ref), id_str) == -1) {
7557 				err = got_error_from_errno("asprintf");
7558 				free(id);
7559 				free(id_str);
7560 				return err;
7561 			}
7562 			free(id);
7563 			free(id_str);
7564 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7565 		    got_ref_get_name(re->ref)) == -1)
7566 			return got_error_from_errno("asprintf");
7567 
7568 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7569 		    0, 0);
7570 		if (err) {
7571 			free(line);
7572 			return err;
7573 		}
7574 		if (n == s->selected) {
7575 			if (view->focussed)
7576 				wstandout(view->window);
7577 			s->selected_entry = re;
7578 		}
7579 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7580 		if (tc)
7581 			wattr_on(view->window,
7582 			    COLOR_PAIR(tc->colorpair), NULL);
7583 		waddwstr(view->window, wline);
7584 		if (tc)
7585 			wattr_off(view->window,
7586 			    COLOR_PAIR(tc->colorpair), NULL);
7587 		if (width < view->ncols - 1)
7588 			waddch(view->window, '\n');
7589 		if (n == s->selected && view->focussed)
7590 			wstandend(view->window);
7591 		free(line);
7592 		free(wline);
7593 		wline = NULL;
7594 		n++;
7595 		s->ndisplayed++;
7596 		s->last_displayed_entry = re;
7597 
7598 		limit--;
7599 		re = TAILQ_NEXT(re, entry);
7600 	}
7601 
7602 	view_border(view);
7603 	return err;
7604 }
7605 
7606 static const struct got_error *
7607 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7608     struct tog_reflist_entry *re, struct got_repository *repo)
7609 {
7610 	const struct got_error *err = NULL;
7611 	struct got_object_id *commit_id = NULL;
7612 	struct tog_view *tree_view;
7613 
7614 	*new_view = NULL;
7615 
7616 	err = resolve_reflist_entry(&commit_id, re, repo);
7617 	if (err) {
7618 		if (err->code != GOT_ERR_OBJ_TYPE)
7619 			return err;
7620 		else
7621 			return NULL;
7622 	}
7623 
7624 
7625 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7626 	if (tree_view == NULL) {
7627 		err = got_error_from_errno("view_open");
7628 		goto done;
7629 	}
7630 
7631 	err = open_tree_view(tree_view, commit_id,
7632 	    got_ref_get_name(re->ref), repo);
7633 	if (err)
7634 		goto done;
7635 
7636 	*new_view = tree_view;
7637 done:
7638 	free(commit_id);
7639 	return err;
7640 }
7641 static const struct got_error *
7642 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7643 {
7644 	const struct got_error *err = NULL;
7645 	struct tog_ref_view_state *s = &view->state.ref;
7646 	struct tog_view *log_view, *tree_view;
7647 	struct tog_reflist_entry *re;
7648 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7649 
7650 	switch (ch) {
7651 	case 'i':
7652 		s->show_ids = !s->show_ids;
7653 		view->count = 0;
7654 		break;
7655 	case 'm':
7656 		s->show_date = !s->show_date;
7657 		view->count = 0;
7658 		break;
7659 	case 'o':
7660 		s->sort_by_date = !s->sort_by_date;
7661 		view->count = 0;
7662 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7663 		    got_ref_cmp_by_commit_timestamp_descending :
7664 		    tog_ref_cmp_by_name, s->repo);
7665 		if (err)
7666 			break;
7667 		got_reflist_object_id_map_free(tog_refs_idmap);
7668 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7669 		    &tog_refs, s->repo);
7670 		if (err)
7671 			break;
7672 		ref_view_free_refs(s);
7673 		err = ref_view_load_refs(s);
7674 		break;
7675 	case KEY_ENTER:
7676 	case '\r':
7677 		view->count = 0;
7678 		if (!s->selected_entry)
7679 			break;
7680 		if (view_is_parent_view(view))
7681 			view_get_split(view, &begin_y, &begin_x);
7682 
7683 		err = log_ref_entry(&log_view, begin_y, begin_x,
7684 		    s->selected_entry, s->repo);
7685 		if (err)
7686 			break;
7687 
7688 		if (view_is_parent_view(view) &&
7689 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7690 			err = view_init_hsplit(view, begin_y);
7691 			if (err)
7692 				break;
7693 		}
7694 
7695 		view->focussed = 0;
7696 		log_view->focussed = 1;
7697 		log_view->mode = view->mode;
7698 		log_view->nlines = view->lines - begin_y;
7699 		if (view_is_parent_view(view)) {
7700 			view_transfer_size(log_view, view);
7701 			err = view_close_child(view);
7702 			if (err)
7703 				return err;
7704 			err = view_set_child(view, log_view);
7705 			if (err)
7706 				return err;
7707 			view->focus_child = 1;
7708 		} else
7709 			*new_view = log_view;
7710 		break;
7711 	case 't':
7712 		view->count = 0;
7713 		if (!s->selected_entry)
7714 			break;
7715 		if (view_is_parent_view(view))
7716 			view_get_split(view, &begin_y, &begin_x);
7717 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7718 		    s->selected_entry, s->repo);
7719 		if (err || tree_view == NULL)
7720 			break;
7721 		if (view_is_parent_view(view) &&
7722 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7723 			err = view_init_hsplit(view, begin_y);
7724 			if (err)
7725 				break;
7726 		}
7727 		view->focussed = 0;
7728 		tree_view->focussed = 1;
7729 		tree_view->mode = view->mode;
7730 		tree_view->nlines = view->lines - begin_y;
7731 		if (view_is_parent_view(view)) {
7732 			view_transfer_size(tree_view, view);
7733 			err = view_close_child(view);
7734 			if (err)
7735 				return err;
7736 			err = view_set_child(view, tree_view);
7737 			if (err)
7738 				return err;
7739 			view->focus_child = 1;
7740 		} else
7741 			*new_view = tree_view;
7742 		break;
7743 	case 'g':
7744 	case KEY_HOME:
7745 		s->selected = 0;
7746 		view->count = 0;
7747 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7748 		break;
7749 	case 'G':
7750 	case KEY_END: {
7751 		int eos = view->nlines - 1;
7752 
7753 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7754 			--eos;  /* border */
7755 		s->selected = 0;
7756 		view->count = 0;
7757 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7758 		for (n = 0; n < eos; n++) {
7759 			if (re == NULL)
7760 				break;
7761 			s->first_displayed_entry = re;
7762 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7763 		}
7764 		if (n > 0)
7765 			s->selected = n - 1;
7766 		break;
7767 	}
7768 	case 'k':
7769 	case KEY_UP:
7770 	case CTRL('p'):
7771 		if (s->selected > 0) {
7772 			s->selected--;
7773 			break;
7774 		}
7775 		ref_scroll_up(s, 1);
7776 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7777 			view->count = 0;
7778 		break;
7779 	case CTRL('u'):
7780 	case 'u':
7781 		nscroll /= 2;
7782 		/* FALL THROUGH */
7783 	case KEY_PPAGE:
7784 	case CTRL('b'):
7785 	case 'b':
7786 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7787 			s->selected -= MIN(nscroll, s->selected);
7788 		ref_scroll_up(s, MAX(0, nscroll));
7789 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7790 			view->count = 0;
7791 		break;
7792 	case 'j':
7793 	case KEY_DOWN:
7794 	case CTRL('n'):
7795 		if (s->selected < s->ndisplayed - 1) {
7796 			s->selected++;
7797 			break;
7798 		}
7799 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7800 			/* can't scroll any further */
7801 			view->count = 0;
7802 			break;
7803 		}
7804 		ref_scroll_down(view, 1);
7805 		break;
7806 	case CTRL('d'):
7807 	case 'd':
7808 		nscroll /= 2;
7809 		/* FALL THROUGH */
7810 	case KEY_NPAGE:
7811 	case CTRL('f'):
7812 	case 'f':
7813 	case ' ':
7814 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7815 			/* can't scroll any further; move cursor down */
7816 			if (s->selected < s->ndisplayed - 1)
7817 				s->selected += MIN(nscroll,
7818 				    s->ndisplayed - s->selected - 1);
7819 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7820 				s->selected += s->ndisplayed - s->selected - 1;
7821 			view->count = 0;
7822 			break;
7823 		}
7824 		ref_scroll_down(view, nscroll);
7825 		break;
7826 	case CTRL('l'):
7827 		view->count = 0;
7828 		tog_free_refs();
7829 		err = tog_load_refs(s->repo, s->sort_by_date);
7830 		if (err)
7831 			break;
7832 		ref_view_free_refs(s);
7833 		err = ref_view_load_refs(s);
7834 		break;
7835 	case KEY_RESIZE:
7836 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7837 			s->selected = view->nlines - 2;
7838 		break;
7839 	default:
7840 		view->count = 0;
7841 		break;
7842 	}
7843 
7844 	return err;
7845 }
7846 
7847 __dead static void
7848 usage_ref(void)
7849 {
7850 	endwin();
7851 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7852 	    getprogname());
7853 	exit(1);
7854 }
7855 
7856 static const struct got_error *
7857 cmd_ref(int argc, char *argv[])
7858 {
7859 	const struct got_error *error;
7860 	struct got_repository *repo = NULL;
7861 	struct got_worktree *worktree = NULL;
7862 	char *cwd = NULL, *repo_path = NULL;
7863 	int ch;
7864 	struct tog_view *view;
7865 	int *pack_fds = NULL;
7866 
7867 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7868 		switch (ch) {
7869 		case 'r':
7870 			repo_path = realpath(optarg, NULL);
7871 			if (repo_path == NULL)
7872 				return got_error_from_errno2("realpath",
7873 				    optarg);
7874 			break;
7875 		default:
7876 			usage_ref();
7877 			/* NOTREACHED */
7878 		}
7879 	}
7880 
7881 	argc -= optind;
7882 	argv += optind;
7883 
7884 	if (argc > 1)
7885 		usage_ref();
7886 
7887 	error = got_repo_pack_fds_open(&pack_fds);
7888 	if (error != NULL)
7889 		goto done;
7890 
7891 	if (repo_path == NULL) {
7892 		cwd = getcwd(NULL, 0);
7893 		if (cwd == NULL)
7894 			return got_error_from_errno("getcwd");
7895 		error = got_worktree_open(&worktree, cwd);
7896 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7897 			goto done;
7898 		if (worktree)
7899 			repo_path =
7900 			    strdup(got_worktree_get_repo_path(worktree));
7901 		else
7902 			repo_path = strdup(cwd);
7903 		if (repo_path == NULL) {
7904 			error = got_error_from_errno("strdup");
7905 			goto done;
7906 		}
7907 	}
7908 
7909 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7910 	if (error != NULL)
7911 		goto done;
7912 
7913 	init_curses();
7914 
7915 	error = apply_unveil(got_repo_get_path(repo), NULL);
7916 	if (error)
7917 		goto done;
7918 
7919 	error = tog_load_refs(repo, 0);
7920 	if (error)
7921 		goto done;
7922 
7923 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7924 	if (view == NULL) {
7925 		error = got_error_from_errno("view_open");
7926 		goto done;
7927 	}
7928 
7929 	error = open_ref_view(view, repo);
7930 	if (error)
7931 		goto done;
7932 
7933 	if (worktree) {
7934 		/* Release work tree lock. */
7935 		got_worktree_close(worktree);
7936 		worktree = NULL;
7937 	}
7938 	error = view_loop(view);
7939 done:
7940 	free(repo_path);
7941 	free(cwd);
7942 	if (repo) {
7943 		const struct got_error *close_err = got_repo_close(repo);
7944 		if (close_err)
7945 			error = close_err;
7946 	}
7947 	if (pack_fds) {
7948 		const struct got_error *pack_err =
7949 		    got_repo_pack_fds_close(pack_fds);
7950 		if (error == NULL)
7951 			error = pack_err;
7952 	}
7953 	tog_free_refs();
7954 	return error;
7955 }
7956 
7957 /*
7958  * If view was scrolled down to move the selected line into view when opening a
7959  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7960  */
7961 static void
7962 offset_selection_up(struct tog_view *view)
7963 {
7964 	switch (view->type) {
7965 	case TOG_VIEW_BLAME: {
7966 		struct tog_blame_view_state *s = &view->state.blame;
7967 		if (s->first_displayed_line == 1) {
7968 			s->selected_line = MAX(s->selected_line - view->offset,
7969 			    1);
7970 			break;
7971 		}
7972 		if (s->first_displayed_line > view->offset)
7973 			s->first_displayed_line -= view->offset;
7974 		else
7975 			s->first_displayed_line = 1;
7976 		s->selected_line += view->offset;
7977 		break;
7978 	}
7979 	case TOG_VIEW_LOG:
7980 		log_scroll_up(&view->state.log, view->offset);
7981 		view->state.log.selected += view->offset;
7982 		break;
7983 	case TOG_VIEW_REF:
7984 		ref_scroll_up(&view->state.ref, view->offset);
7985 		view->state.ref.selected += view->offset;
7986 		break;
7987 	case TOG_VIEW_TREE:
7988 		tree_scroll_up(&view->state.tree, view->offset);
7989 		view->state.tree.selected += view->offset;
7990 		break;
7991 	default:
7992 		break;
7993 	}
7994 
7995 	view->offset = 0;
7996 }
7997 
7998 /*
7999  * If the selected line is in the section of screen covered by the bottom split,
8000  * scroll down offset lines to move it into view and index its new position.
8001  */
8002 static const struct got_error *
8003 offset_selection_down(struct tog_view *view)
8004 {
8005 	const struct got_error	*err = NULL;
8006 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8007 	int			*selected = NULL;
8008 	int			 header, offset;
8009 
8010 	switch (view->type) {
8011 	case TOG_VIEW_BLAME: {
8012 		struct tog_blame_view_state *s = &view->state.blame;
8013 		header = 3;
8014 		scrolld = NULL;
8015 		if (s->selected_line > view->nlines - header) {
8016 			offset = abs(view->nlines - s->selected_line - header);
8017 			s->first_displayed_line += offset;
8018 			s->selected_line -= offset;
8019 			view->offset = offset;
8020 		}
8021 		break;
8022 	}
8023 	case TOG_VIEW_LOG: {
8024 		struct tog_log_view_state *s = &view->state.log;
8025 		scrolld = &log_scroll_down;
8026 		header = view_is_parent_view(view) ? 3 : 2;
8027 		selected = &s->selected;
8028 		break;
8029 	}
8030 	case TOG_VIEW_REF: {
8031 		struct tog_ref_view_state *s = &view->state.ref;
8032 		scrolld = &ref_scroll_down;
8033 		header = 3;
8034 		selected = &s->selected;
8035 		break;
8036 	}
8037 	case TOG_VIEW_TREE: {
8038 		struct tog_tree_view_state *s = &view->state.tree;
8039 		scrolld = &tree_scroll_down;
8040 		header = 5;
8041 		selected = &s->selected;
8042 		break;
8043 	}
8044 	default:
8045 		selected = NULL;
8046 		scrolld = NULL;
8047 		header = 0;
8048 		break;
8049 	}
8050 
8051 	if (selected && *selected > view->nlines - header) {
8052 		offset = abs(view->nlines - *selected - header);
8053 		view->offset = offset;
8054 		if (scrolld && offset) {
8055 			err = scrolld(view, offset);
8056 			*selected -= offset;
8057 		}
8058 	}
8059 
8060 	return err;
8061 }
8062 
8063 static void
8064 list_commands(FILE *fp)
8065 {
8066 	size_t i;
8067 
8068 	fprintf(fp, "commands:");
8069 	for (i = 0; i < nitems(tog_commands); i++) {
8070 		const struct tog_cmd *cmd = &tog_commands[i];
8071 		fprintf(fp, " %s", cmd->name);
8072 	}
8073 	fputc('\n', fp);
8074 }
8075 
8076 __dead static void
8077 usage(int hflag, int status)
8078 {
8079 	FILE *fp = (status == 0) ? stdout : stderr;
8080 
8081 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8082 	    getprogname());
8083 	if (hflag) {
8084 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8085 		list_commands(fp);
8086 	}
8087 	exit(status);
8088 }
8089 
8090 static char **
8091 make_argv(int argc, ...)
8092 {
8093 	va_list ap;
8094 	char **argv;
8095 	int i;
8096 
8097 	va_start(ap, argc);
8098 
8099 	argv = calloc(argc, sizeof(char *));
8100 	if (argv == NULL)
8101 		err(1, "calloc");
8102 	for (i = 0; i < argc; i++) {
8103 		argv[i] = strdup(va_arg(ap, char *));
8104 		if (argv[i] == NULL)
8105 			err(1, "strdup");
8106 	}
8107 
8108 	va_end(ap);
8109 	return argv;
8110 }
8111 
8112 /*
8113  * Try to convert 'tog path' into a 'tog log path' command.
8114  * The user could simply have mistyped the command rather than knowingly
8115  * provided a path. So check whether argv[0] can in fact be resolved
8116  * to a path in the HEAD commit and print a special error if not.
8117  * This hack is for mpi@ <3
8118  */
8119 static const struct got_error *
8120 tog_log_with_path(int argc, char *argv[])
8121 {
8122 	const struct got_error *error = NULL, *close_err;
8123 	const struct tog_cmd *cmd = NULL;
8124 	struct got_repository *repo = NULL;
8125 	struct got_worktree *worktree = NULL;
8126 	struct got_object_id *commit_id = NULL, *id = NULL;
8127 	struct got_commit_object *commit = NULL;
8128 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8129 	char *commit_id_str = NULL, **cmd_argv = NULL;
8130 	int *pack_fds = NULL;
8131 
8132 	cwd = getcwd(NULL, 0);
8133 	if (cwd == NULL)
8134 		return got_error_from_errno("getcwd");
8135 
8136 	error = got_repo_pack_fds_open(&pack_fds);
8137 	if (error != NULL)
8138 		goto done;
8139 
8140 	error = got_worktree_open(&worktree, cwd);
8141 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8142 		goto done;
8143 
8144 	if (worktree)
8145 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8146 	else
8147 		repo_path = strdup(cwd);
8148 	if (repo_path == NULL) {
8149 		error = got_error_from_errno("strdup");
8150 		goto done;
8151 	}
8152 
8153 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8154 	if (error != NULL)
8155 		goto done;
8156 
8157 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8158 	    repo, worktree);
8159 	if (error)
8160 		goto done;
8161 
8162 	error = tog_load_refs(repo, 0);
8163 	if (error)
8164 		goto done;
8165 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8166 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8167 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8168 	if (error)
8169 		goto done;
8170 
8171 	if (worktree) {
8172 		got_worktree_close(worktree);
8173 		worktree = NULL;
8174 	}
8175 
8176 	error = got_object_open_as_commit(&commit, repo, commit_id);
8177 	if (error)
8178 		goto done;
8179 
8180 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8181 	if (error) {
8182 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8183 			goto done;
8184 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8185 		    getprogname(), argv[0]);
8186 		usage(1, 1);
8187 		/* not reached */
8188 	}
8189 
8190 	close_err = got_repo_close(repo);
8191 	if (error == NULL)
8192 		error = close_err;
8193 	repo = NULL;
8194 
8195 	error = got_object_id_str(&commit_id_str, commit_id);
8196 	if (error)
8197 		goto done;
8198 
8199 	cmd = &tog_commands[0]; /* log */
8200 	argc = 4;
8201 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8202 	error = cmd->cmd_main(argc, cmd_argv);
8203 done:
8204 	if (repo) {
8205 		close_err = got_repo_close(repo);
8206 		if (error == NULL)
8207 			error = close_err;
8208 	}
8209 	if (commit)
8210 		got_object_commit_close(commit);
8211 	if (worktree)
8212 		got_worktree_close(worktree);
8213 	if (pack_fds) {
8214 		const struct got_error *pack_err =
8215 		    got_repo_pack_fds_close(pack_fds);
8216 		if (error == NULL)
8217 			error = pack_err;
8218 	}
8219 	free(id);
8220 	free(commit_id_str);
8221 	free(commit_id);
8222 	free(cwd);
8223 	free(repo_path);
8224 	free(in_repo_path);
8225 	if (cmd_argv) {
8226 		int i;
8227 		for (i = 0; i < argc; i++)
8228 			free(cmd_argv[i]);
8229 		free(cmd_argv);
8230 	}
8231 	tog_free_refs();
8232 	return error;
8233 }
8234 
8235 int
8236 main(int argc, char *argv[])
8237 {
8238 	const struct got_error *error = NULL;
8239 	const struct tog_cmd *cmd = NULL;
8240 	int ch, hflag = 0, Vflag = 0;
8241 	char **cmd_argv = NULL;
8242 	static const struct option longopts[] = {
8243 	    { "version", no_argument, NULL, 'V' },
8244 	    { NULL, 0, NULL, 0}
8245 	};
8246 	char *diff_algo_str = NULL;
8247 
8248 	setlocale(LC_CTYPE, "");
8249 
8250 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8251 		switch (ch) {
8252 		case 'h':
8253 			hflag = 1;
8254 			break;
8255 		case 'V':
8256 			Vflag = 1;
8257 			break;
8258 		default:
8259 			usage(hflag, 1);
8260 			/* NOTREACHED */
8261 		}
8262 	}
8263 
8264 	argc -= optind;
8265 	argv += optind;
8266 	optind = 1;
8267 	optreset = 1;
8268 
8269 	if (Vflag) {
8270 		got_version_print_str();
8271 		return 0;
8272 	}
8273 
8274 #ifndef PROFILE
8275 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8276 	    NULL) == -1)
8277 		err(1, "pledge");
8278 #endif
8279 
8280 	if (argc == 0) {
8281 		if (hflag)
8282 			usage(hflag, 0);
8283 		/* Build an argument vector which runs a default command. */
8284 		cmd = &tog_commands[0];
8285 		argc = 1;
8286 		cmd_argv = make_argv(argc, cmd->name);
8287 	} else {
8288 		size_t i;
8289 
8290 		/* Did the user specify a command? */
8291 		for (i = 0; i < nitems(tog_commands); i++) {
8292 			if (strncmp(tog_commands[i].name, argv[0],
8293 			    strlen(argv[0])) == 0) {
8294 				cmd = &tog_commands[i];
8295 				break;
8296 			}
8297 		}
8298 	}
8299 
8300 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8301 	if (diff_algo_str) {
8302 		if (strcasecmp(diff_algo_str, "patience") == 0)
8303 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8304 		if (strcasecmp(diff_algo_str, "myers") == 0)
8305 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8306 	}
8307 
8308 	if (cmd == NULL) {
8309 		if (argc != 1)
8310 			usage(0, 1);
8311 		/* No command specified; try log with a path */
8312 		error = tog_log_with_path(argc, argv);
8313 	} else {
8314 		if (hflag)
8315 			cmd->cmd_usage();
8316 		else
8317 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8318 	}
8319 
8320 	endwin();
8321 	putchar('\n');
8322 	if (cmd_argv) {
8323 		int i;
8324 		for (i = 0; i < argc; i++)
8325 			free(cmd_argv[i]);
8326 		free(cmd_argv);
8327 	}
8328 
8329 	if (error && error->code != GOT_ERR_CANCELLED)
8330 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8331 	return 0;
8332 }