1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 };
112 
113 enum tog_view_mode {
114 	TOG_VIEW_SPLIT_NONE,
115 	TOG_VIEW_SPLIT_VERT,
116 	TOG_VIEW_SPLIT_HRZN
117 };
118 
119 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
120 
121 #define TOG_EOF_STRING	"(END)"
122 
123 struct commit_queue_entry {
124 	TAILQ_ENTRY(commit_queue_entry) entry;
125 	struct got_object_id *id;
126 	struct got_commit_object *commit;
127 	int idx;
128 };
129 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
130 struct commit_queue {
131 	int ncommits;
132 	struct commit_queue_head head;
133 };
134 
135 struct tog_color {
136 	STAILQ_ENTRY(tog_color) entry;
137 	regex_t regex;
138 	short colorpair;
139 };
140 STAILQ_HEAD(tog_colors, tog_color);
141 
142 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
143 static struct got_reflist_object_id_map *tog_refs_idmap;
144 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
145 
146 static const struct got_error *
147 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
148     struct got_reference* re2)
149 {
150 	const char *name1 = got_ref_get_name(re1);
151 	const char *name2 = got_ref_get_name(re2);
152 	int isbackup1, isbackup2;
153 
154 	/* Sort backup refs towards the bottom of the list. */
155 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
156 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
157 	if (!isbackup1 && isbackup2) {
158 		*cmp = -1;
159 		return NULL;
160 	} else if (isbackup1 && !isbackup2) {
161 		*cmp = 1;
162 		return NULL;
163 	}
164 
165 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
166 	return NULL;
167 }
168 
169 static const struct got_error *
170 tog_load_refs(struct got_repository *repo, int sort_by_date)
171 {
172 	const struct got_error *err;
173 
174 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
175 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
176 	    repo);
177 	if (err)
178 		return err;
179 
180 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
181 	    repo);
182 }
183 
184 static void
185 tog_free_refs(void)
186 {
187 	if (tog_refs_idmap) {
188 		got_reflist_object_id_map_free(tog_refs_idmap);
189 		tog_refs_idmap = NULL;
190 	}
191 	got_ref_list_free(&tog_refs);
192 }
193 
194 static const struct got_error *
195 add_color(struct tog_colors *colors, const char *pattern,
196     int idx, short color)
197 {
198 	const struct got_error *err = NULL;
199 	struct tog_color *tc;
200 	int regerr = 0;
201 
202 	if (idx < 1 || idx > COLOR_PAIRS - 1)
203 		return NULL;
204 
205 	init_pair(idx, color, -1);
206 
207 	tc = calloc(1, sizeof(*tc));
208 	if (tc == NULL)
209 		return got_error_from_errno("calloc");
210 	regerr = regcomp(&tc->regex, pattern,
211 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
212 	if (regerr) {
213 		static char regerr_msg[512];
214 		static char err_msg[512];
215 		regerror(regerr, &tc->regex, regerr_msg,
216 		    sizeof(regerr_msg));
217 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
218 		    regerr_msg);
219 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
220 		free(tc);
221 		return err;
222 	}
223 	tc->colorpair = idx;
224 	STAILQ_INSERT_HEAD(colors, tc, entry);
225 	return NULL;
226 }
227 
228 static void
229 free_colors(struct tog_colors *colors)
230 {
231 	struct tog_color *tc;
232 
233 	while (!STAILQ_EMPTY(colors)) {
234 		tc = STAILQ_FIRST(colors);
235 		STAILQ_REMOVE_HEAD(colors, entry);
236 		regfree(&tc->regex);
237 		free(tc);
238 	}
239 }
240 
241 static struct tog_color *
242 get_color(struct tog_colors *colors, int colorpair)
243 {
244 	struct tog_color *tc = NULL;
245 
246 	STAILQ_FOREACH(tc, colors, entry) {
247 		if (tc->colorpair == colorpair)
248 			return tc;
249 	}
250 
251 	return NULL;
252 }
253 
254 static int
255 default_color_value(const char *envvar)
256 {
257 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
258 		return COLOR_MAGENTA;
259 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
260 		return COLOR_CYAN;
261 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
262 		return COLOR_YELLOW;
263 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
264 		return COLOR_GREEN;
265 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
270 		return COLOR_CYAN;
271 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
274 		return COLOR_GREEN;
275 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
276 		return COLOR_CYAN;
277 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
278 		return COLOR_YELLOW;
279 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
282 		return COLOR_MAGENTA;
283 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
284 		return COLOR_YELLOW;
285 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
286 		return COLOR_CYAN;
287 
288 	return -1;
289 }
290 
291 static int
292 get_color_value(const char *envvar)
293 {
294 	const char *val = getenv(envvar);
295 
296 	if (val == NULL)
297 		return default_color_value(envvar);
298 
299 	if (strcasecmp(val, "black") == 0)
300 		return COLOR_BLACK;
301 	if (strcasecmp(val, "red") == 0)
302 		return COLOR_RED;
303 	if (strcasecmp(val, "green") == 0)
304 		return COLOR_GREEN;
305 	if (strcasecmp(val, "yellow") == 0)
306 		return COLOR_YELLOW;
307 	if (strcasecmp(val, "blue") == 0)
308 		return COLOR_BLUE;
309 	if (strcasecmp(val, "magenta") == 0)
310 		return COLOR_MAGENTA;
311 	if (strcasecmp(val, "cyan") == 0)
312 		return COLOR_CYAN;
313 	if (strcasecmp(val, "white") == 0)
314 		return COLOR_WHITE;
315 	if (strcasecmp(val, "default") == 0)
316 		return -1;
317 
318 	return default_color_value(envvar);
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 lineno;
327 	int first_displayed_line;
328 	int last_displayed_line;
329 	int eof;
330 	int diff_context;
331 	int ignore_whitespace;
332 	int force_text_diff;
333 	struct got_repository *repo;
334 	struct got_diff_line *lines;
335 	size_t nlines;
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 	int use_committer;
384 };
385 
386 #define TOG_COLOR_DIFF_MINUS		1
387 #define TOG_COLOR_DIFF_PLUS		2
388 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
389 #define TOG_COLOR_DIFF_META		4
390 #define TOG_COLOR_TREE_SUBMODULE	5
391 #define TOG_COLOR_TREE_SYMLINK		6
392 #define TOG_COLOR_TREE_DIRECTORY	7
393 #define TOG_COLOR_TREE_EXECUTABLE	8
394 #define TOG_COLOR_COMMIT		9
395 #define TOG_COLOR_AUTHOR		10
396 #define TOG_COLOR_DATE			11
397 #define TOG_COLOR_REFS_HEADS		12
398 #define TOG_COLOR_REFS_TAGS		13
399 #define TOG_COLOR_REFS_REMOTES		14
400 #define TOG_COLOR_REFS_BACKUP		15
401 
402 struct tog_blame_cb_args {
403 	struct tog_blame_line *lines; /* one per line */
404 	int nlines;
405 
406 	struct tog_view *view;
407 	struct got_object_id *commit_id;
408 	int *quit;
409 };
410 
411 struct tog_blame_thread_args {
412 	const char *path;
413 	struct got_repository *repo;
414 	struct tog_blame_cb_args *cb_args;
415 	int *complete;
416 	got_cancel_cb cancel_cb;
417 	void *cancel_arg;
418 };
419 
420 struct tog_blame {
421 	FILE *f;
422 	off_t filesize;
423 	struct tog_blame_line *lines;
424 	int nlines;
425 	off_t *line_offsets;
426 	pthread_t thread;
427 	struct tog_blame_thread_args thread_args;
428 	struct tog_blame_cb_args cb_args;
429 	const char *path;
430 	int *pack_fds;
431 };
432 
433 struct tog_blame_view_state {
434 	int first_displayed_line;
435 	int last_displayed_line;
436 	int selected_line;
437 	int last_diffed_line;
438 	int blame_complete;
439 	int eof;
440 	int done;
441 	struct got_object_id_queue blamed_commits;
442 	struct got_object_qid *blamed_commit;
443 	char *path;
444 	struct got_repository *repo;
445 	struct got_object_id *commit_id;
446 	struct got_object_id *id_to_log;
447 	struct tog_blame blame;
448 	int matched_line;
449 	struct tog_colors colors;
450 };
451 
452 struct tog_parent_tree {
453 	TAILQ_ENTRY(tog_parent_tree) entry;
454 	struct got_tree_object *tree;
455 	struct got_tree_entry *first_displayed_entry;
456 	struct got_tree_entry *selected_entry;
457 	int selected;
458 };
459 
460 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
461 
462 struct tog_tree_view_state {
463 	char *tree_label;
464 	struct got_object_id *commit_id;/* commit which this tree belongs to */
465 	struct got_tree_object *root;	/* the commit's root tree entry */
466 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
467 	struct got_tree_entry *first_displayed_entry;
468 	struct got_tree_entry *last_displayed_entry;
469 	struct got_tree_entry *selected_entry;
470 	int ndisplayed, selected, show_ids;
471 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
472 	char *head_ref_name;
473 	struct got_repository *repo;
474 	struct got_tree_entry *matched_entry;
475 	struct tog_colors colors;
476 };
477 
478 struct tog_reflist_entry {
479 	TAILQ_ENTRY(tog_reflist_entry) entry;
480 	struct got_reference *ref;
481 	int idx;
482 };
483 
484 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
485 
486 struct tog_ref_view_state {
487 	struct tog_reflist_head refs;
488 	struct tog_reflist_entry *first_displayed_entry;
489 	struct tog_reflist_entry *last_displayed_entry;
490 	struct tog_reflist_entry *selected_entry;
491 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
492 	struct got_repository *repo;
493 	struct tog_reflist_entry *matched_entry;
494 	struct tog_colors colors;
495 };
496 
497 /*
498  * We implement two types of views: parent views and child views.
499  *
500  * The 'Tab' key switches focus between a parent view and its child view.
501  * Child views are shown side-by-side to their parent view, provided
502  * there is enough screen estate.
503  *
504  * When a new view is opened from within a parent view, this new view
505  * becomes a child view of the parent view, replacing any existing child.
506  *
507  * When a new view is opened from within a child view, this new view
508  * becomes a parent view which will obscure the views below until the
509  * user quits the new parent view by typing 'q'.
510  *
511  * This list of views contains parent views only.
512  * Child views are only pointed to by their parent view.
513  */
514 TAILQ_HEAD(tog_view_list_head, tog_view);
515 
516 struct tog_view {
517 	TAILQ_ENTRY(tog_view) entry;
518 	WINDOW *window;
519 	PANEL *panel;
520 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
521 	int resized_y, resized_x; /* begin_y/x based on user resizing */
522 	int maxx, x; /* max column and current start column */
523 	int lines, cols; /* copies of LINES and COLS */
524 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
525 	int gline, hiline; /* navigate to and highlight this nG line */
526 	int ch, count; /* current keymap and count prefix */
527 	int resized; /* set when in a resize event */
528 	int focussed; /* Only set on one parent or child view at a time. */
529 	int dying;
530 	struct tog_view *parent;
531 	struct tog_view *child;
532 
533 	/*
534 	 * This flag is initially set on parent views when a new child view
535 	 * is created. It gets toggled when the 'Tab' key switches focus
536 	 * between parent and child.
537 	 * The flag indicates whether focus should be passed on to our child
538 	 * view if this parent view gets picked for focus after another parent
539 	 * view was closed. This prevents child views from losing focus in such
540 	 * situations.
541 	 */
542 	int focus_child;
543 
544 	enum tog_view_mode mode;
545 	/* type-specific state */
546 	enum tog_view_type type;
547 	union {
548 		struct tog_diff_view_state diff;
549 		struct tog_log_view_state log;
550 		struct tog_blame_view_state blame;
551 		struct tog_tree_view_state tree;
552 		struct tog_ref_view_state ref;
553 	} state;
554 
555 	const struct got_error *(*show)(struct tog_view *);
556 	const struct got_error *(*input)(struct tog_view **,
557 	    struct tog_view *, int);
558 	const struct got_error *(*reset)(struct tog_view *);
559 	const struct got_error *(*resize)(struct tog_view *, int);
560 	const struct got_error *(*close)(struct tog_view *);
561 
562 	const struct got_error *(*search_start)(struct tog_view *);
563 	const struct got_error *(*search_next)(struct tog_view *);
564 	int search_started;
565 	int searching;
566 #define TOG_SEARCH_FORWARD	1
567 #define TOG_SEARCH_BACKWARD	2
568 	int search_next_done;
569 #define TOG_SEARCH_HAVE_MORE	1
570 #define TOG_SEARCH_NO_MORE	2
571 #define TOG_SEARCH_HAVE_NONE	3
572 	regex_t regex;
573 	regmatch_t regmatch;
574 };
575 
576 static const struct got_error *open_diff_view(struct tog_view *,
577     struct got_object_id *, struct got_object_id *,
578     const char *, const char *, int, int, int, struct tog_view *,
579     struct got_repository *);
580 static const struct got_error *show_diff_view(struct tog_view *);
581 static const struct got_error *input_diff_view(struct tog_view **,
582     struct tog_view *, int);
583 static const struct got_error *reset_diff_view(struct tog_view *);
584 static const struct got_error* close_diff_view(struct tog_view *);
585 static const struct got_error *search_start_diff_view(struct tog_view *);
586 static const struct got_error *search_next_diff_view(struct tog_view *);
587 
588 static const struct got_error *open_log_view(struct tog_view *,
589     struct got_object_id *, struct got_repository *,
590     const char *, const char *, int);
591 static const struct got_error * show_log_view(struct tog_view *);
592 static const struct got_error *input_log_view(struct tog_view **,
593     struct tog_view *, int);
594 static const struct got_error *resize_log_view(struct tog_view *, int);
595 static const struct got_error *close_log_view(struct tog_view *);
596 static const struct got_error *search_start_log_view(struct tog_view *);
597 static const struct got_error *search_next_log_view(struct tog_view *);
598 
599 static const struct got_error *open_blame_view(struct tog_view *, char *,
600     struct got_object_id *, struct got_repository *);
601 static const struct got_error *show_blame_view(struct tog_view *);
602 static const struct got_error *input_blame_view(struct tog_view **,
603     struct tog_view *, int);
604 static const struct got_error *reset_blame_view(struct tog_view *);
605 static const struct got_error *close_blame_view(struct tog_view *);
606 static const struct got_error *search_start_blame_view(struct tog_view *);
607 static const struct got_error *search_next_blame_view(struct tog_view *);
608 
609 static const struct got_error *open_tree_view(struct tog_view *,
610     struct got_object_id *, const char *, struct got_repository *);
611 static const struct got_error *show_tree_view(struct tog_view *);
612 static const struct got_error *input_tree_view(struct tog_view **,
613     struct tog_view *, int);
614 static const struct got_error *close_tree_view(struct tog_view *);
615 static const struct got_error *search_start_tree_view(struct tog_view *);
616 static const struct got_error *search_next_tree_view(struct tog_view *);
617 
618 static const struct got_error *open_ref_view(struct tog_view *,
619     struct got_repository *);
620 static const struct got_error *show_ref_view(struct tog_view *);
621 static const struct got_error *input_ref_view(struct tog_view **,
622     struct tog_view *, int);
623 static const struct got_error *close_ref_view(struct tog_view *);
624 static const struct got_error *search_start_ref_view(struct tog_view *);
625 static const struct got_error *search_next_ref_view(struct tog_view *);
626 
627 static volatile sig_atomic_t tog_sigwinch_received;
628 static volatile sig_atomic_t tog_sigpipe_received;
629 static volatile sig_atomic_t tog_sigcont_received;
630 static volatile sig_atomic_t tog_sigint_received;
631 static volatile sig_atomic_t tog_sigterm_received;
632 
633 static void
634 tog_sigwinch(int signo)
635 {
636 	tog_sigwinch_received = 1;
637 }
638 
639 static void
640 tog_sigpipe(int signo)
641 {
642 	tog_sigpipe_received = 1;
643 }
644 
645 static void
646 tog_sigcont(int signo)
647 {
648 	tog_sigcont_received = 1;
649 }
650 
651 static void
652 tog_sigint(int signo)
653 {
654 	tog_sigint_received = 1;
655 }
656 
657 static void
658 tog_sigterm(int signo)
659 {
660 	tog_sigterm_received = 1;
661 }
662 
663 static int
664 tog_fatal_signal_received(void)
665 {
666 	return (tog_sigpipe_received ||
667 	    tog_sigint_received || tog_sigint_received);
668 }
669 
670 static const struct got_error *
671 view_close(struct tog_view *view)
672 {
673 	const struct got_error *err = NULL, *child_err = NULL;
674 
675 	if (view->child) {
676 		child_err = view_close(view->child);
677 		view->child = NULL;
678 	}
679 	if (view->close)
680 		err = view->close(view);
681 	if (view->panel)
682 		del_panel(view->panel);
683 	if (view->window)
684 		delwin(view->window);
685 	free(view);
686 	return err ? err : child_err;
687 }
688 
689 static struct tog_view *
690 view_open(int nlines, int ncols, int begin_y, int begin_x,
691     enum tog_view_type type)
692 {
693 	struct tog_view *view = calloc(1, sizeof(*view));
694 
695 	if (view == NULL)
696 		return NULL;
697 
698 	view->type = type;
699 	view->lines = LINES;
700 	view->cols = COLS;
701 	view->nlines = nlines ? nlines : LINES - begin_y;
702 	view->ncols = ncols ? ncols : COLS - begin_x;
703 	view->begin_y = begin_y;
704 	view->begin_x = begin_x;
705 	view->window = newwin(nlines, ncols, begin_y, begin_x);
706 	if (view->window == NULL) {
707 		view_close(view);
708 		return NULL;
709 	}
710 	view->panel = new_panel(view->window);
711 	if (view->panel == NULL ||
712 	    set_panel_userptr(view->panel, view) != OK) {
713 		view_close(view);
714 		return NULL;
715 	}
716 
717 	keypad(view->window, TRUE);
718 	return view;
719 }
720 
721 static int
722 view_split_begin_x(int begin_x)
723 {
724 	if (begin_x > 0 || COLS < 120)
725 		return 0;
726 	return (COLS - MAX(COLS / 2, 80));
727 }
728 
729 /* XXX Stub till we decide what to do. */
730 static int
731 view_split_begin_y(int lines)
732 {
733 	return lines * HSPLIT_SCALE;
734 }
735 
736 static const struct got_error *view_resize(struct tog_view *);
737 
738 static const struct got_error *
739 view_splitscreen(struct tog_view *view)
740 {
741 	const struct got_error *err = NULL;
742 
743 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
744 		if (view->resized_y && view->resized_y < view->lines)
745 			view->begin_y = view->resized_y;
746 		else
747 			view->begin_y = view_split_begin_y(view->nlines);
748 		view->begin_x = 0;
749 	} else if (!view->resized) {
750 		if (view->resized_x && view->resized_x < view->cols - 1 &&
751 		    view->cols > 119)
752 			view->begin_x = view->resized_x;
753 		else
754 			view->begin_x = view_split_begin_x(0);
755 		view->begin_y = 0;
756 	}
757 	view->nlines = LINES - view->begin_y;
758 	view->ncols = COLS - view->begin_x;
759 	view->lines = LINES;
760 	view->cols = COLS;
761 	err = view_resize(view);
762 	if (err)
763 		return err;
764 
765 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
766 		view->parent->nlines = view->begin_y;
767 
768 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
769 		return got_error_from_errno("mvwin");
770 
771 	return NULL;
772 }
773 
774 static const struct got_error *
775 view_fullscreen(struct tog_view *view)
776 {
777 	const struct got_error *err = NULL;
778 
779 	view->begin_x = 0;
780 	view->begin_y = view->resized ? view->begin_y : 0;
781 	view->nlines = view->resized ? view->nlines : LINES;
782 	view->ncols = COLS;
783 	view->lines = LINES;
784 	view->cols = COLS;
785 	err = view_resize(view);
786 	if (err)
787 		return err;
788 
789 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
790 		return got_error_from_errno("mvwin");
791 
792 	return NULL;
793 }
794 
795 static int
796 view_is_parent_view(struct tog_view *view)
797 {
798 	return view->parent == NULL;
799 }
800 
801 static int
802 view_is_splitscreen(struct tog_view *view)
803 {
804 	return view->begin_x > 0 || view->begin_y > 0;
805 }
806 
807 static int
808 view_is_fullscreen(struct tog_view *view)
809 {
810 	return view->nlines == LINES && view->ncols == COLS;
811 }
812 
813 static int
814 view_is_hsplit_top(struct tog_view *view)
815 {
816 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
817 	    view_is_splitscreen(view->child);
818 }
819 
820 static void
821 view_border(struct tog_view *view)
822 {
823 	PANEL *panel;
824 	const struct tog_view *view_above;
825 
826 	if (view->parent)
827 		return view_border(view->parent);
828 
829 	panel = panel_above(view->panel);
830 	if (panel == NULL)
831 		return;
832 
833 	view_above = panel_userptr(panel);
834 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
835 		mvwhline(view->window, view_above->begin_y - 1,
836 		    view->begin_x, got_locale_is_utf8() ?
837 		    ACS_HLINE : '-', view->ncols);
838 	else
839 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
840 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
841 }
842 
843 static const struct got_error *view_init_hsplit(struct tog_view *, int);
844 static const struct got_error *request_log_commits(struct tog_view *);
845 static const struct got_error *offset_selection_down(struct tog_view *);
846 static void offset_selection_up(struct tog_view *);
847 static void view_get_split(struct tog_view *, int *, int *);
848 
849 static const struct got_error *
850 view_resize(struct tog_view *view)
851 {
852 	const struct got_error	*err = NULL;
853 	int			 dif, nlines, ncols;
854 
855 	dif = LINES - view->lines;  /* line difference */
856 
857 	if (view->lines > LINES)
858 		nlines = view->nlines - (view->lines - LINES);
859 	else
860 		nlines = view->nlines + (LINES - view->lines);
861 	if (view->cols > COLS)
862 		ncols = view->ncols - (view->cols - COLS);
863 	else
864 		ncols = view->ncols + (COLS - view->cols);
865 
866 	if (view->child) {
867 		int hs = view->child->begin_y;
868 
869 		if (!view_is_fullscreen(view))
870 			view->child->begin_x = view_split_begin_x(view->begin_x);
871 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
872 		    view->child->begin_x == 0) {
873 			ncols = COLS;
874 
875 			view_fullscreen(view->child);
876 			if (view->child->focussed)
877 				show_panel(view->child->panel);
878 			else
879 				show_panel(view->panel);
880 		} else {
881 			ncols = view->child->begin_x;
882 
883 			view_splitscreen(view->child);
884 			show_panel(view->child->panel);
885 		}
886 		/*
887 		 * XXX This is ugly and needs to be moved into the above
888 		 * logic but "works" for now and my attempts at moving it
889 		 * break either 'tab' or 'F' key maps in horizontal splits.
890 		 */
891 		if (hs) {
892 			err = view_splitscreen(view->child);
893 			if (err)
894 				return err;
895 			if (dif < 0) { /* top split decreased */
896 				err = offset_selection_down(view);
897 				if (err)
898 					return err;
899 			}
900 			view_border(view);
901 			update_panels();
902 			doupdate();
903 			show_panel(view->child->panel);
904 			nlines = view->nlines;
905 		}
906 	} else if (view->parent == NULL)
907 		ncols = COLS;
908 
909 	if (view->resize && dif > 0) {
910 		err = view->resize(view, dif);
911 		if (err)
912 			return err;
913 	}
914 
915 	if (wresize(view->window, nlines, ncols) == ERR)
916 		return got_error_from_errno("wresize");
917 	if (replace_panel(view->panel, view->window) == ERR)
918 		return got_error_from_errno("replace_panel");
919 	wclear(view->window);
920 
921 	view->nlines = nlines;
922 	view->ncols = ncols;
923 	view->lines = LINES;
924 	view->cols = COLS;
925 
926 	return NULL;
927 }
928 
929 static const struct got_error *
930 resize_log_view(struct tog_view *view, int increase)
931 {
932 	struct tog_log_view_state	*s = &view->state.log;
933 	const struct got_error		*err = NULL;
934 	int				 n = 0;
935 
936 	if (s->selected_entry)
937 		n = s->selected_entry->idx + view->lines - s->selected;
938 
939 	/*
940 	 * Request commits to account for the increased
941 	 * height so we have enough to populate the view.
942 	 */
943 	if (s->commits.ncommits < n) {
944 		view->nscrolled = n - s->commits.ncommits + increase + 1;
945 		err = request_log_commits(view);
946 	}
947 
948 	return err;
949 }
950 
951 static void
952 view_adjust_offset(struct tog_view *view, int n)
953 {
954 	if (n == 0)
955 		return;
956 
957 	if (view->parent && view->parent->offset) {
958 		if (view->parent->offset + n >= 0)
959 			view->parent->offset += n;
960 		else
961 			view->parent->offset = 0;
962 	} else if (view->offset) {
963 		if (view->offset - n >= 0)
964 			view->offset -= n;
965 		else
966 			view->offset = 0;
967 	}
968 }
969 
970 static const struct got_error *
971 view_resize_split(struct tog_view *view, int resize)
972 {
973 	const struct got_error	*err = NULL;
974 	struct tog_view		*v = NULL;
975 
976 	if (view->parent)
977 		v = view->parent;
978 	else
979 		v = view;
980 
981 	if (!v->child || !view_is_splitscreen(v->child))
982 		return NULL;
983 
984 	v->resized = v->child->resized = resize;  /* lock for resize event */
985 
986 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
987 		if (v->child->resized_y)
988 			v->child->begin_y = v->child->resized_y;
989 		if (view->parent)
990 			v->child->begin_y -= resize;
991 		else
992 			v->child->begin_y += resize;
993 		if (v->child->begin_y < 3) {
994 			view->count = 0;
995 			v->child->begin_y = 3;
996 		} else if (v->child->begin_y > LINES - 1) {
997 			view->count = 0;
998 			v->child->begin_y = LINES - 1;
999 		}
1000 		v->ncols = COLS;
1001 		v->child->ncols = COLS;
1002 		view_adjust_offset(view, resize);
1003 		err = view_init_hsplit(v, v->child->begin_y);
1004 		if (err)
1005 			return err;
1006 		v->child->resized_y = v->child->begin_y;
1007 	} else {
1008 		if (v->child->resized_x)
1009 			v->child->begin_x = v->child->resized_x;
1010 		if (view->parent)
1011 			v->child->begin_x -= resize;
1012 		else
1013 			v->child->begin_x += resize;
1014 		if (v->child->begin_x < 11) {
1015 			view->count = 0;
1016 			v->child->begin_x = 11;
1017 		} else if (v->child->begin_x > COLS - 1) {
1018 			view->count = 0;
1019 			v->child->begin_x = COLS - 1;
1020 		}
1021 		v->child->resized_x = v->child->begin_x;
1022 	}
1023 
1024 	v->child->mode = v->mode;
1025 	v->child->nlines = v->lines - v->child->begin_y;
1026 	v->child->ncols = v->cols - v->child->begin_x;
1027 	v->focus_child = 1;
1028 
1029 	err = view_fullscreen(v);
1030 	if (err)
1031 		return err;
1032 	err = view_splitscreen(v->child);
1033 	if (err)
1034 		return err;
1035 
1036 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1037 		err = offset_selection_down(v->child);
1038 		if (err)
1039 			return err;
1040 	}
1041 
1042 	if (v->resize)
1043 		err = v->resize(v, 0);
1044 	else if (v->child->resize)
1045 		err = v->child->resize(v->child, 0);
1046 
1047 	v->resized = v->child->resized = 0;
1048 
1049 	return err;
1050 }
1051 
1052 static void
1053 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1054 {
1055 	struct tog_view *v = src->child ? src->child : src;
1056 
1057 	dst->resized_x = v->resized_x;
1058 	dst->resized_y = v->resized_y;
1059 }
1060 
1061 static const struct got_error *
1062 view_close_child(struct tog_view *view)
1063 {
1064 	const struct got_error *err = NULL;
1065 
1066 	if (view->child == NULL)
1067 		return NULL;
1068 
1069 	err = view_close(view->child);
1070 	view->child = NULL;
1071 	return err;
1072 }
1073 
1074 static const struct got_error *
1075 view_set_child(struct tog_view *view, struct tog_view *child)
1076 {
1077 	const struct got_error *err = NULL;
1078 
1079 	view->child = child;
1080 	child->parent = view;
1081 
1082 	err = view_resize(view);
1083 	if (err)
1084 		return err;
1085 
1086 	if (view->child->resized_x || view->child->resized_y)
1087 		err = view_resize_split(view, 0);
1088 
1089 	return err;
1090 }
1091 
1092 static const struct got_error *view_dispatch_request(struct tog_view **,
1093     struct tog_view *, enum tog_view_type, int, int);
1094 
1095 static const struct got_error *
1096 view_request_new(struct tog_view **requested, struct tog_view *view,
1097     enum tog_view_type request)
1098 {
1099 	struct tog_view		*new_view = NULL;
1100 	const struct got_error	*err;
1101 	int			 y = 0, x = 0;
1102 
1103 	*requested = NULL;
1104 
1105 	if (view_is_parent_view(view))
1106 		view_get_split(view, &y, &x);
1107 
1108 	err = view_dispatch_request(&new_view, view, request, y, x);
1109 	if (err)
1110 		return err;
1111 
1112 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1113 		err = view_init_hsplit(view, y);
1114 		if (err)
1115 			return err;
1116 	}
1117 
1118 	view->focussed = 0;
1119 	new_view->focussed = 1;
1120 	new_view->mode = view->mode;
1121 	new_view->nlines = view->lines - y;
1122 
1123 	if (view_is_parent_view(view)) {
1124 		view_transfer_size(new_view, view);
1125 		err = view_close_child(view);
1126 		if (err)
1127 			return err;
1128 		err = view_set_child(view, new_view);
1129 		if (err)
1130 			return err;
1131 		view->focus_child = 1;
1132 	} else
1133 		*requested = new_view;
1134 
1135 	return NULL;
1136 }
1137 
1138 static void
1139 tog_resizeterm(void)
1140 {
1141 	int cols, lines;
1142 	struct winsize size;
1143 
1144 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1145 		cols = 80;     /* Default */
1146 		lines = 24;
1147 	} else {
1148 		cols = size.ws_col;
1149 		lines = size.ws_row;
1150 	}
1151 	resize_term(lines, cols);
1152 }
1153 
1154 static const struct got_error *
1155 view_search_start(struct tog_view *view)
1156 {
1157 	const struct got_error *err = NULL;
1158 	struct tog_view *v = view;
1159 	char pattern[1024];
1160 	int ret;
1161 
1162 	if (view->search_started) {
1163 		regfree(&view->regex);
1164 		view->searching = 0;
1165 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1166 	}
1167 	view->search_started = 0;
1168 
1169 	if (view->nlines < 1)
1170 		return NULL;
1171 
1172 	if (view_is_hsplit_top(view))
1173 		v = view->child;
1174 
1175 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1176 	wclrtoeol(v->window);
1177 
1178 	nodelay(view->window, FALSE);  /* block for search term input */
1179 	nocbreak();
1180 	echo();
1181 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1182 	wrefresh(v->window);
1183 	cbreak();
1184 	noecho();
1185 	nodelay(view->window, TRUE);
1186 	if (ret == ERR)
1187 		return NULL;
1188 
1189 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1190 		err = view->search_start(view);
1191 		if (err) {
1192 			regfree(&view->regex);
1193 			return err;
1194 		}
1195 		view->search_started = 1;
1196 		view->searching = TOG_SEARCH_FORWARD;
1197 		view->search_next_done = 0;
1198 		view->search_next(view);
1199 	}
1200 
1201 	return NULL;
1202 }
1203 
1204 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1205 static const struct got_error *
1206 switch_split(struct tog_view *view)
1207 {
1208 	const struct got_error	*err = NULL;
1209 	struct tog_view		*v = NULL;
1210 
1211 	if (view->parent)
1212 		v = view->parent;
1213 	else
1214 		v = view;
1215 
1216 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1217 		v->mode = TOG_VIEW_SPLIT_VERT;
1218 	else
1219 		v->mode = TOG_VIEW_SPLIT_HRZN;
1220 
1221 	if (!v->child)
1222 		return NULL;
1223 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1224 		v->mode = TOG_VIEW_SPLIT_NONE;
1225 
1226 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1227 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1228 		v->child->begin_y = v->child->resized_y;
1229 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1230 		v->child->begin_x = v->child->resized_x;
1231 
1232 
1233 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1234 		v->ncols = COLS;
1235 		v->child->ncols = COLS;
1236 		v->child->nscrolled = LINES - v->child->nlines;
1237 
1238 		err = view_init_hsplit(v, v->child->begin_y);
1239 		if (err)
1240 			return err;
1241 	}
1242 	v->child->mode = v->mode;
1243 	v->child->nlines = v->lines - v->child->begin_y;
1244 	v->focus_child = 1;
1245 
1246 	err = view_fullscreen(v);
1247 	if (err)
1248 		return err;
1249 	err = view_splitscreen(v->child);
1250 	if (err)
1251 		return err;
1252 
1253 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1254 		v->mode = TOG_VIEW_SPLIT_VERT;
1255 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1256 		err = offset_selection_down(v);
1257 		if (err)
1258 			return err;
1259 		err = offset_selection_down(v->child);
1260 		if (err)
1261 			return err;
1262 	} else {
1263 		offset_selection_up(v);
1264 		offset_selection_up(v->child);
1265 	}
1266 	if (v->resize)
1267 		err = v->resize(v, 0);
1268 	else if (v->child->resize)
1269 		err = v->child->resize(v->child, 0);
1270 
1271 	return err;
1272 }
1273 
1274 /*
1275  * Compute view->count from numeric input. Assign total to view->count and
1276  * return first non-numeric key entered.
1277  */
1278 static int
1279 get_compound_key(struct tog_view *view, int c)
1280 {
1281 	struct tog_view	*v = view;
1282 	int		 x, n = 0;
1283 
1284 	if (view_is_hsplit_top(view))
1285 		v = view->child;
1286 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1287 		v = view->parent;
1288 
1289 	view->count = 0;
1290 	cbreak();  /* block for input */
1291 	nodelay(view->window, FALSE);
1292 	wmove(v->window, v->nlines - 1, 0);
1293 	wclrtoeol(v->window);
1294 	waddch(v->window, ':');
1295 
1296 	do {
1297 		x = getcurx(v->window);
1298 		if (x != ERR && x < view->ncols) {
1299 			waddch(v->window, c);
1300 			wrefresh(v->window);
1301 		}
1302 
1303 		/*
1304 		 * Don't overflow. Max valid request should be the greatest
1305 		 * between the longest and total lines; cap at 10 million.
1306 		 */
1307 		if (n >= 9999999)
1308 			n = 9999999;
1309 		else
1310 			n = n * 10 + (c - '0');
1311 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1312 
1313 	if (c == 'G' || c == 'g') {	/* nG key map */
1314 		view->gline = view->hiline = n;
1315 		n = 0;
1316 		c = 0;
1317 	}
1318 
1319 	/* Massage excessive or inapplicable values at the input handler. */
1320 	view->count = n;
1321 
1322 	return c;
1323 }
1324 
1325 static const struct got_error *
1326 view_input(struct tog_view **new, int *done, struct tog_view *view,
1327     struct tog_view_list_head *views)
1328 {
1329 	const struct got_error *err = NULL;
1330 	struct tog_view *v;
1331 	int ch, errcode;
1332 
1333 	*new = NULL;
1334 
1335 	/* Clear "no matches" indicator. */
1336 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1337 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1338 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1339 		view->count = 0;
1340 	}
1341 
1342 	if (view->searching && !view->search_next_done) {
1343 		errcode = pthread_mutex_unlock(&tog_mutex);
1344 		if (errcode)
1345 			return got_error_set_errno(errcode,
1346 			    "pthread_mutex_unlock");
1347 		sched_yield();
1348 		errcode = pthread_mutex_lock(&tog_mutex);
1349 		if (errcode)
1350 			return got_error_set_errno(errcode,
1351 			    "pthread_mutex_lock");
1352 		view->search_next(view);
1353 		return NULL;
1354 	}
1355 
1356 	/* Allow threads to make progress while we are waiting for input. */
1357 	errcode = pthread_mutex_unlock(&tog_mutex);
1358 	if (errcode)
1359 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1360 	/* If we have an unfinished count, let C-g or backspace abort. */
1361 	if (view->count && --view->count) {
1362 		cbreak();
1363 		nodelay(view->window, TRUE);
1364 		ch = wgetch(view->window);
1365 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1366 			view->count = 0;
1367 		else
1368 			ch = view->ch;
1369 	} else {
1370 		ch = wgetch(view->window);
1371 		if (ch >= '1' && ch  <= '9')
1372 			view->ch = ch = get_compound_key(view, ch);
1373 	}
1374 	if (view->hiline && ch != ERR && ch != 0)
1375 		view->hiline = 0;  /* key pressed, clear line highlight */
1376 	nodelay(view->window, TRUE);
1377 	errcode = pthread_mutex_lock(&tog_mutex);
1378 	if (errcode)
1379 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1380 
1381 	if (tog_sigwinch_received || tog_sigcont_received) {
1382 		tog_resizeterm();
1383 		tog_sigwinch_received = 0;
1384 		tog_sigcont_received = 0;
1385 		TAILQ_FOREACH(v, views, entry) {
1386 			err = view_resize(v);
1387 			if (err)
1388 				return err;
1389 			err = v->input(new, v, KEY_RESIZE);
1390 			if (err)
1391 				return err;
1392 			if (v->child) {
1393 				err = view_resize(v->child);
1394 				if (err)
1395 					return err;
1396 				err = v->child->input(new, v->child,
1397 				    KEY_RESIZE);
1398 				if (err)
1399 					return err;
1400 				if (v->child->resized_x || v->child->resized_y) {
1401 					err = view_resize_split(v, 0);
1402 					if (err)
1403 						return err;
1404 				}
1405 			}
1406 		}
1407 	}
1408 
1409 	switch (ch) {
1410 	case '\t':
1411 		view->count = 0;
1412 		if (view->child) {
1413 			view->focussed = 0;
1414 			view->child->focussed = 1;
1415 			view->focus_child = 1;
1416 		} else if (view->parent) {
1417 			view->focussed = 0;
1418 			view->parent->focussed = 1;
1419 			view->parent->focus_child = 0;
1420 			if (!view_is_splitscreen(view)) {
1421 				if (view->parent->resize) {
1422 					err = view->parent->resize(view->parent,
1423 					    0);
1424 					if (err)
1425 						return err;
1426 				}
1427 				offset_selection_up(view->parent);
1428 				err = view_fullscreen(view->parent);
1429 				if (err)
1430 					return err;
1431 			}
1432 		}
1433 		break;
1434 	case 'q':
1435 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1436 			if (view->parent->resize) {
1437 				/* might need more commits to fill fullscreen */
1438 				err = view->parent->resize(view->parent, 0);
1439 				if (err)
1440 					break;
1441 			}
1442 			offset_selection_up(view->parent);
1443 		}
1444 		err = view->input(new, view, ch);
1445 		view->dying = 1;
1446 		break;
1447 	case 'Q':
1448 		*done = 1;
1449 		break;
1450 	case 'F':
1451 		view->count = 0;
1452 		if (view_is_parent_view(view)) {
1453 			if (view->child == NULL)
1454 				break;
1455 			if (view_is_splitscreen(view->child)) {
1456 				view->focussed = 0;
1457 				view->child->focussed = 1;
1458 				err = view_fullscreen(view->child);
1459 			} else {
1460 				err = view_splitscreen(view->child);
1461 				if (!err)
1462 					err = view_resize_split(view, 0);
1463 			}
1464 			if (err)
1465 				break;
1466 			err = view->child->input(new, view->child,
1467 			    KEY_RESIZE);
1468 		} else {
1469 			if (view_is_splitscreen(view)) {
1470 				view->parent->focussed = 0;
1471 				view->focussed = 1;
1472 				err = view_fullscreen(view);
1473 			} else {
1474 				err = view_splitscreen(view);
1475 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1476 					err = view_resize(view->parent);
1477 				if (!err)
1478 					err = view_resize_split(view, 0);
1479 			}
1480 			if (err)
1481 				break;
1482 			err = view->input(new, view, KEY_RESIZE);
1483 		}
1484 		if (err)
1485 			break;
1486 		if (view->resize) {
1487 			err = view->resize(view, 0);
1488 			if (err)
1489 				break;
1490 		}
1491 		if (view->parent)
1492 			err = offset_selection_down(view->parent);
1493 		if (!err)
1494 			err = offset_selection_down(view);
1495 		break;
1496 	case 'S':
1497 		view->count = 0;
1498 		err = switch_split(view);
1499 		break;
1500 	case '-':
1501 		err = view_resize_split(view, -1);
1502 		break;
1503 	case '+':
1504 		err = view_resize_split(view, 1);
1505 		break;
1506 	case KEY_RESIZE:
1507 		break;
1508 	case '/':
1509 		view->count = 0;
1510 		if (view->search_start)
1511 			view_search_start(view);
1512 		else
1513 			err = view->input(new, view, ch);
1514 		break;
1515 	case 'N':
1516 	case 'n':
1517 		if (view->search_started && view->search_next) {
1518 			view->searching = (ch == 'n' ?
1519 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1520 			view->search_next_done = 0;
1521 			view->search_next(view);
1522 		} else
1523 			err = view->input(new, view, ch);
1524 		break;
1525 	case 'A':
1526 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1527 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1528 		else
1529 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1530 		TAILQ_FOREACH(v, views, entry) {
1531 			if (v->reset) {
1532 				err = v->reset(v);
1533 				if (err)
1534 					return err;
1535 			}
1536 			if (v->child && v->child->reset) {
1537 				err = v->child->reset(v->child);
1538 				if (err)
1539 					return err;
1540 			}
1541 		}
1542 		break;
1543 	default:
1544 		err = view->input(new, view, ch);
1545 		break;
1546 	}
1547 
1548 	return err;
1549 }
1550 
1551 static int
1552 view_needs_focus_indication(struct tog_view *view)
1553 {
1554 	if (view_is_parent_view(view)) {
1555 		if (view->child == NULL || view->child->focussed)
1556 			return 0;
1557 		if (!view_is_splitscreen(view->child))
1558 			return 0;
1559 	} else if (!view_is_splitscreen(view))
1560 		return 0;
1561 
1562 	return view->focussed;
1563 }
1564 
1565 static const struct got_error *
1566 view_loop(struct tog_view *view)
1567 {
1568 	const struct got_error *err = NULL;
1569 	struct tog_view_list_head views;
1570 	struct tog_view *new_view;
1571 	char *mode;
1572 	int fast_refresh = 10;
1573 	int done = 0, errcode;
1574 
1575 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1576 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1577 		view->mode = TOG_VIEW_SPLIT_VERT;
1578 	else
1579 		view->mode = TOG_VIEW_SPLIT_HRZN;
1580 
1581 	errcode = pthread_mutex_lock(&tog_mutex);
1582 	if (errcode)
1583 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1584 
1585 	TAILQ_INIT(&views);
1586 	TAILQ_INSERT_HEAD(&views, view, entry);
1587 
1588 	view->focussed = 1;
1589 	err = view->show(view);
1590 	if (err)
1591 		return err;
1592 	update_panels();
1593 	doupdate();
1594 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1595 	    !tog_fatal_signal_received()) {
1596 		/* Refresh fast during initialization, then become slower. */
1597 		if (fast_refresh && fast_refresh-- == 0)
1598 			halfdelay(10); /* switch to once per second */
1599 
1600 		err = view_input(&new_view, &done, view, &views);
1601 		if (err)
1602 			break;
1603 		if (view->dying) {
1604 			struct tog_view *v, *prev = NULL;
1605 
1606 			if (view_is_parent_view(view))
1607 				prev = TAILQ_PREV(view, tog_view_list_head,
1608 				    entry);
1609 			else if (view->parent)
1610 				prev = view->parent;
1611 
1612 			if (view->parent) {
1613 				view->parent->child = NULL;
1614 				view->parent->focus_child = 0;
1615 				/* Restore fullscreen line height. */
1616 				view->parent->nlines = view->parent->lines;
1617 				err = view_resize(view->parent);
1618 				if (err)
1619 					break;
1620 				/* Make resized splits persist. */
1621 				view_transfer_size(view->parent, view);
1622 			} else
1623 				TAILQ_REMOVE(&views, view, entry);
1624 
1625 			err = view_close(view);
1626 			if (err)
1627 				goto done;
1628 
1629 			view = NULL;
1630 			TAILQ_FOREACH(v, &views, entry) {
1631 				if (v->focussed)
1632 					break;
1633 			}
1634 			if (view == NULL && new_view == NULL) {
1635 				/* No view has focus. Try to pick one. */
1636 				if (prev)
1637 					view = prev;
1638 				else if (!TAILQ_EMPTY(&views)) {
1639 					view = TAILQ_LAST(&views,
1640 					    tog_view_list_head);
1641 				}
1642 				if (view) {
1643 					if (view->focus_child) {
1644 						view->child->focussed = 1;
1645 						view = view->child;
1646 					} else
1647 						view->focussed = 1;
1648 				}
1649 			}
1650 		}
1651 		if (new_view) {
1652 			struct tog_view *v, *t;
1653 			/* Only allow one parent view per type. */
1654 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1655 				if (v->type != new_view->type)
1656 					continue;
1657 				TAILQ_REMOVE(&views, v, entry);
1658 				err = view_close(v);
1659 				if (err)
1660 					goto done;
1661 				break;
1662 			}
1663 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1664 			view = new_view;
1665 		}
1666 		if (view) {
1667 			if (view_is_parent_view(view)) {
1668 				if (view->child && view->child->focussed)
1669 					view = view->child;
1670 			} else {
1671 				if (view->parent && view->parent->focussed)
1672 					view = view->parent;
1673 			}
1674 			show_panel(view->panel);
1675 			if (view->child && view_is_splitscreen(view->child))
1676 				show_panel(view->child->panel);
1677 			if (view->parent && view_is_splitscreen(view)) {
1678 				err = view->parent->show(view->parent);
1679 				if (err)
1680 					goto done;
1681 			}
1682 			err = view->show(view);
1683 			if (err)
1684 				goto done;
1685 			if (view->child) {
1686 				err = view->child->show(view->child);
1687 				if (err)
1688 					goto done;
1689 			}
1690 			update_panels();
1691 			doupdate();
1692 		}
1693 	}
1694 done:
1695 	while (!TAILQ_EMPTY(&views)) {
1696 		const struct got_error *close_err;
1697 		view = TAILQ_FIRST(&views);
1698 		TAILQ_REMOVE(&views, view, entry);
1699 		close_err = view_close(view);
1700 		if (close_err && err == NULL)
1701 			err = close_err;
1702 	}
1703 
1704 	errcode = pthread_mutex_unlock(&tog_mutex);
1705 	if (errcode && err == NULL)
1706 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1707 
1708 	return err;
1709 }
1710 
1711 __dead static void
1712 usage_log(void)
1713 {
1714 	endwin();
1715 	fprintf(stderr,
1716 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1717 	    getprogname());
1718 	exit(1);
1719 }
1720 
1721 /* Create newly allocated wide-character string equivalent to a byte string. */
1722 static const struct got_error *
1723 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1724 {
1725 	char *vis = NULL;
1726 	const struct got_error *err = NULL;
1727 
1728 	*ws = NULL;
1729 	*wlen = mbstowcs(NULL, s, 0);
1730 	if (*wlen == (size_t)-1) {
1731 		int vislen;
1732 		if (errno != EILSEQ)
1733 			return got_error_from_errno("mbstowcs");
1734 
1735 		/* byte string invalid in current encoding; try to "fix" it */
1736 		err = got_mbsavis(&vis, &vislen, s);
1737 		if (err)
1738 			return err;
1739 		*wlen = mbstowcs(NULL, vis, 0);
1740 		if (*wlen == (size_t)-1) {
1741 			err = got_error_from_errno("mbstowcs"); /* give up */
1742 			goto done;
1743 		}
1744 	}
1745 
1746 	*ws = calloc(*wlen + 1, sizeof(**ws));
1747 	if (*ws == NULL) {
1748 		err = got_error_from_errno("calloc");
1749 		goto done;
1750 	}
1751 
1752 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1753 		err = got_error_from_errno("mbstowcs");
1754 done:
1755 	free(vis);
1756 	if (err) {
1757 		free(*ws);
1758 		*ws = NULL;
1759 		*wlen = 0;
1760 	}
1761 	return err;
1762 }
1763 
1764 static const struct got_error *
1765 expand_tab(char **ptr, const char *src)
1766 {
1767 	char	*dst;
1768 	size_t	 len, n, idx = 0, sz = 0;
1769 
1770 	*ptr = NULL;
1771 	n = len = strlen(src);
1772 	dst = malloc(n + 1);
1773 	if (dst == NULL)
1774 		return got_error_from_errno("malloc");
1775 
1776 	while (idx < len && src[idx]) {
1777 		const char c = src[idx];
1778 
1779 		if (c == '\t') {
1780 			size_t nb = TABSIZE - sz % TABSIZE;
1781 			char *p;
1782 
1783 			p = realloc(dst, n + nb);
1784 			if (p == NULL) {
1785 				free(dst);
1786 				return got_error_from_errno("realloc");
1787 
1788 			}
1789 			dst = p;
1790 			n += nb;
1791 			memset(dst + sz, ' ', nb);
1792 			sz += nb;
1793 		} else
1794 			dst[sz++] = src[idx];
1795 		++idx;
1796 	}
1797 
1798 	dst[sz] = '\0';
1799 	*ptr = dst;
1800 	return NULL;
1801 }
1802 
1803 /*
1804  * Advance at most n columns from wline starting at offset off.
1805  * Return the index to the first character after the span operation.
1806  * Return the combined column width of all spanned wide character in
1807  * *rcol.
1808  */
1809 static int
1810 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1811 {
1812 	int width, i, cols = 0;
1813 
1814 	if (n == 0) {
1815 		*rcol = cols;
1816 		return off;
1817 	}
1818 
1819 	for (i = off; wline[i] != L'\0'; ++i) {
1820 		if (wline[i] == L'\t')
1821 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1822 		else
1823 			width = wcwidth(wline[i]);
1824 
1825 		if (width == -1) {
1826 			width = 1;
1827 			wline[i] = L'.';
1828 		}
1829 
1830 		if (cols + width > n)
1831 			break;
1832 		cols += width;
1833 	}
1834 
1835 	*rcol = cols;
1836 	return i;
1837 }
1838 
1839 /*
1840  * Format a line for display, ensuring that it won't overflow a width limit.
1841  * With scrolling, the width returned refers to the scrolled version of the
1842  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1843  */
1844 static const struct got_error *
1845 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1846     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1847 {
1848 	const struct got_error *err = NULL;
1849 	int cols;
1850 	wchar_t *wline = NULL;
1851 	char *exstr = NULL;
1852 	size_t wlen;
1853 	int i, scrollx;
1854 
1855 	*wlinep = NULL;
1856 	*widthp = 0;
1857 
1858 	if (expand) {
1859 		err = expand_tab(&exstr, line);
1860 		if (err)
1861 			return err;
1862 	}
1863 
1864 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1865 	free(exstr);
1866 	if (err)
1867 		return err;
1868 
1869 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1870 
1871 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1872 		wline[wlen - 1] = L'\0';
1873 		wlen--;
1874 	}
1875 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1876 		wline[wlen - 1] = L'\0';
1877 		wlen--;
1878 	}
1879 
1880 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1881 	wline[i] = L'\0';
1882 
1883 	if (widthp)
1884 		*widthp = cols;
1885 	if (scrollxp)
1886 		*scrollxp = scrollx;
1887 	if (err)
1888 		free(wline);
1889 	else
1890 		*wlinep = wline;
1891 	return err;
1892 }
1893 
1894 static const struct got_error*
1895 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1896     struct got_object_id *id, struct got_repository *repo)
1897 {
1898 	static const struct got_error *err = NULL;
1899 	struct got_reflist_entry *re;
1900 	char *s;
1901 	const char *name;
1902 
1903 	*refs_str = NULL;
1904 
1905 	TAILQ_FOREACH(re, refs, entry) {
1906 		struct got_tag_object *tag = NULL;
1907 		struct got_object_id *ref_id;
1908 		int cmp;
1909 
1910 		name = got_ref_get_name(re->ref);
1911 		if (strcmp(name, GOT_REF_HEAD) == 0)
1912 			continue;
1913 		if (strncmp(name, "refs/", 5) == 0)
1914 			name += 5;
1915 		if (strncmp(name, "got/", 4) == 0 &&
1916 		    strncmp(name, "got/backup/", 11) != 0)
1917 			continue;
1918 		if (strncmp(name, "heads/", 6) == 0)
1919 			name += 6;
1920 		if (strncmp(name, "remotes/", 8) == 0) {
1921 			name += 8;
1922 			s = strstr(name, "/" GOT_REF_HEAD);
1923 			if (s != NULL && s[strlen(s)] == '\0')
1924 				continue;
1925 		}
1926 		err = got_ref_resolve(&ref_id, repo, re->ref);
1927 		if (err)
1928 			break;
1929 		if (strncmp(name, "tags/", 5) == 0) {
1930 			err = got_object_open_as_tag(&tag, repo, ref_id);
1931 			if (err) {
1932 				if (err->code != GOT_ERR_OBJ_TYPE) {
1933 					free(ref_id);
1934 					break;
1935 				}
1936 				/* Ref points at something other than a tag. */
1937 				err = NULL;
1938 				tag = NULL;
1939 			}
1940 		}
1941 		cmp = got_object_id_cmp(tag ?
1942 		    got_object_tag_get_object_id(tag) : ref_id, id);
1943 		free(ref_id);
1944 		if (tag)
1945 			got_object_tag_close(tag);
1946 		if (cmp != 0)
1947 			continue;
1948 		s = *refs_str;
1949 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1950 		    s ? ", " : "", name) == -1) {
1951 			err = got_error_from_errno("asprintf");
1952 			free(s);
1953 			*refs_str = NULL;
1954 			break;
1955 		}
1956 		free(s);
1957 	}
1958 
1959 	return err;
1960 }
1961 
1962 static const struct got_error *
1963 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1964     int col_tab_align)
1965 {
1966 	char *smallerthan;
1967 
1968 	smallerthan = strchr(author, '<');
1969 	if (smallerthan && smallerthan[1] != '\0')
1970 		author = smallerthan + 1;
1971 	author[strcspn(author, "@>")] = '\0';
1972 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1973 	    col_tab_align, 0);
1974 }
1975 
1976 static const struct got_error *
1977 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1978     struct got_object_id *id, const size_t date_display_cols,
1979     int author_display_cols)
1980 {
1981 	struct tog_log_view_state *s = &view->state.log;
1982 	const struct got_error *err = NULL;
1983 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1984 	char *logmsg0 = NULL, *logmsg = NULL;
1985 	char *author = NULL;
1986 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1987 	int author_width, logmsg_width;
1988 	char *newline, *line = NULL;
1989 	int col, limit, scrollx;
1990 	const int avail = view->ncols;
1991 	struct tm tm;
1992 	time_t committer_time;
1993 	struct tog_color *tc;
1994 
1995 	committer_time = got_object_commit_get_committer_time(commit);
1996 	if (gmtime_r(&committer_time, &tm) == NULL)
1997 		return got_error_from_errno("gmtime_r");
1998 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1999 		return got_error(GOT_ERR_NO_SPACE);
2000 
2001 	if (avail <= date_display_cols)
2002 		limit = MIN(sizeof(datebuf) - 1, avail);
2003 	else
2004 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2005 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2006 	if (tc)
2007 		wattr_on(view->window,
2008 		    COLOR_PAIR(tc->colorpair), NULL);
2009 	waddnstr(view->window, datebuf, limit);
2010 	if (tc)
2011 		wattr_off(view->window,
2012 		    COLOR_PAIR(tc->colorpair), NULL);
2013 	col = limit;
2014 	if (col > avail)
2015 		goto done;
2016 
2017 	if (avail >= 120) {
2018 		char *id_str;
2019 		err = got_object_id_str(&id_str, id);
2020 		if (err)
2021 			goto done;
2022 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2023 		if (tc)
2024 			wattr_on(view->window,
2025 			    COLOR_PAIR(tc->colorpair), NULL);
2026 		wprintw(view->window, "%.8s ", id_str);
2027 		if (tc)
2028 			wattr_off(view->window,
2029 			    COLOR_PAIR(tc->colorpair), NULL);
2030 		free(id_str);
2031 		col += 9;
2032 		if (col > avail)
2033 			goto done;
2034 	}
2035 
2036 	if (s->use_committer)
2037 		author = strdup(got_object_commit_get_committer(commit));
2038 	else
2039 		author = strdup(got_object_commit_get_author(commit));
2040 	if (author == NULL) {
2041 		err = got_error_from_errno("strdup");
2042 		goto done;
2043 	}
2044 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2045 	if (err)
2046 		goto done;
2047 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2048 	if (tc)
2049 		wattr_on(view->window,
2050 		    COLOR_PAIR(tc->colorpair), NULL);
2051 	waddwstr(view->window, wauthor);
2052 	if (tc)
2053 		wattr_off(view->window,
2054 		    COLOR_PAIR(tc->colorpair), NULL);
2055 	col += author_width;
2056 	while (col < avail && author_width < author_display_cols + 2) {
2057 		waddch(view->window, ' ');
2058 		col++;
2059 		author_width++;
2060 	}
2061 	if (col > avail)
2062 		goto done;
2063 
2064 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2065 	if (err)
2066 		goto done;
2067 	logmsg = logmsg0;
2068 	while (*logmsg == '\n')
2069 		logmsg++;
2070 	newline = strchr(logmsg, '\n');
2071 	if (newline)
2072 		*newline = '\0';
2073 	limit = avail - col;
2074 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2075 		limit--;	/* for the border */
2076 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2077 	    limit, col, 1);
2078 	if (err)
2079 		goto done;
2080 	waddwstr(view->window, &wlogmsg[scrollx]);
2081 	col += MAX(logmsg_width, 0);
2082 	while (col < avail) {
2083 		waddch(view->window, ' ');
2084 		col++;
2085 	}
2086 done:
2087 	free(logmsg0);
2088 	free(wlogmsg);
2089 	free(author);
2090 	free(wauthor);
2091 	free(line);
2092 	return err;
2093 }
2094 
2095 static struct commit_queue_entry *
2096 alloc_commit_queue_entry(struct got_commit_object *commit,
2097     struct got_object_id *id)
2098 {
2099 	struct commit_queue_entry *entry;
2100 
2101 	entry = calloc(1, sizeof(*entry));
2102 	if (entry == NULL)
2103 		return NULL;
2104 
2105 	entry->id = id;
2106 	entry->commit = commit;
2107 	return entry;
2108 }
2109 
2110 static void
2111 pop_commit(struct commit_queue *commits)
2112 {
2113 	struct commit_queue_entry *entry;
2114 
2115 	entry = TAILQ_FIRST(&commits->head);
2116 	TAILQ_REMOVE(&commits->head, entry, entry);
2117 	got_object_commit_close(entry->commit);
2118 	commits->ncommits--;
2119 	/* Don't free entry->id! It is owned by the commit graph. */
2120 	free(entry);
2121 }
2122 
2123 static void
2124 free_commits(struct commit_queue *commits)
2125 {
2126 	while (!TAILQ_EMPTY(&commits->head))
2127 		pop_commit(commits);
2128 }
2129 
2130 static const struct got_error *
2131 match_commit(int *have_match, struct got_object_id *id,
2132     struct got_commit_object *commit, regex_t *regex)
2133 {
2134 	const struct got_error *err = NULL;
2135 	regmatch_t regmatch;
2136 	char *id_str = NULL, *logmsg = NULL;
2137 
2138 	*have_match = 0;
2139 
2140 	err = got_object_id_str(&id_str, id);
2141 	if (err)
2142 		return err;
2143 
2144 	err = got_object_commit_get_logmsg(&logmsg, commit);
2145 	if (err)
2146 		goto done;
2147 
2148 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2149 	    &regmatch, 0) == 0 ||
2150 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2151 	    &regmatch, 0) == 0 ||
2152 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2153 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2154 		*have_match = 1;
2155 done:
2156 	free(id_str);
2157 	free(logmsg);
2158 	return err;
2159 }
2160 
2161 static const struct got_error *
2162 queue_commits(struct tog_log_thread_args *a)
2163 {
2164 	const struct got_error *err = NULL;
2165 
2166 	/*
2167 	 * We keep all commits open throughout the lifetime of the log
2168 	 * view in order to avoid having to re-fetch commits from disk
2169 	 * while updating the display.
2170 	 */
2171 	do {
2172 		struct got_object_id *id;
2173 		struct got_commit_object *commit;
2174 		struct commit_queue_entry *entry;
2175 		int errcode;
2176 
2177 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2178 		    NULL, NULL);
2179 		if (err || id == NULL)
2180 			break;
2181 
2182 		err = got_object_open_as_commit(&commit, a->repo, id);
2183 		if (err)
2184 			break;
2185 		entry = alloc_commit_queue_entry(commit, id);
2186 		if (entry == NULL) {
2187 			err = got_error_from_errno("alloc_commit_queue_entry");
2188 			break;
2189 		}
2190 
2191 		errcode = pthread_mutex_lock(&tog_mutex);
2192 		if (errcode) {
2193 			err = got_error_set_errno(errcode,
2194 			    "pthread_mutex_lock");
2195 			break;
2196 		}
2197 
2198 		entry->idx = a->commits->ncommits;
2199 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2200 		a->commits->ncommits++;
2201 
2202 		if (*a->searching == TOG_SEARCH_FORWARD &&
2203 		    !*a->search_next_done) {
2204 			int have_match;
2205 			err = match_commit(&have_match, id, commit, a->regex);
2206 			if (err)
2207 				break;
2208 			if (have_match)
2209 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2210 		}
2211 
2212 		errcode = pthread_mutex_unlock(&tog_mutex);
2213 		if (errcode && err == NULL)
2214 			err = got_error_set_errno(errcode,
2215 			    "pthread_mutex_unlock");
2216 		if (err)
2217 			break;
2218 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2219 
2220 	return err;
2221 }
2222 
2223 static void
2224 select_commit(struct tog_log_view_state *s)
2225 {
2226 	struct commit_queue_entry *entry;
2227 	int ncommits = 0;
2228 
2229 	entry = s->first_displayed_entry;
2230 	while (entry) {
2231 		if (ncommits == s->selected) {
2232 			s->selected_entry = entry;
2233 			break;
2234 		}
2235 		entry = TAILQ_NEXT(entry, entry);
2236 		ncommits++;
2237 	}
2238 }
2239 
2240 static const struct got_error *
2241 draw_commits(struct tog_view *view)
2242 {
2243 	const struct got_error *err = NULL;
2244 	struct tog_log_view_state *s = &view->state.log;
2245 	struct commit_queue_entry *entry = s->selected_entry;
2246 	int limit = view->nlines;
2247 	int width;
2248 	int ncommits, author_cols = 4;
2249 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2250 	char *refs_str = NULL;
2251 	wchar_t *wline;
2252 	struct tog_color *tc;
2253 	static const size_t date_display_cols = 12;
2254 
2255 	if (view_is_hsplit_top(view))
2256 		--limit;  /* account for border */
2257 
2258 	if (s->selected_entry &&
2259 	    !(view->searching && view->search_next_done == 0)) {
2260 		struct got_reflist_head *refs;
2261 		err = got_object_id_str(&id_str, s->selected_entry->id);
2262 		if (err)
2263 			return err;
2264 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2265 		    s->selected_entry->id);
2266 		if (refs) {
2267 			err = build_refs_str(&refs_str, refs,
2268 			    s->selected_entry->id, s->repo);
2269 			if (err)
2270 				goto done;
2271 		}
2272 	}
2273 
2274 	if (s->thread_args.commits_needed == 0)
2275 		halfdelay(10); /* disable fast refresh */
2276 
2277 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2278 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2279 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2280 		    (view->searching && !view->search_next_done) ?
2281 		    "searching..." : "loading...") == -1) {
2282 			err = got_error_from_errno("asprintf");
2283 			goto done;
2284 		}
2285 	} else {
2286 		const char *search_str = NULL;
2287 
2288 		if (view->searching) {
2289 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2290 				search_str = "no more matches";
2291 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2292 				search_str = "no matches found";
2293 			else if (!view->search_next_done)
2294 				search_str = "searching...";
2295 		}
2296 
2297 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2298 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2299 		    search_str ? search_str :
2300 		    (refs_str ? refs_str : "")) == -1) {
2301 			err = got_error_from_errno("asprintf");
2302 			goto done;
2303 		}
2304 	}
2305 
2306 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2307 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2308 		    "........................................",
2309 		    s->in_repo_path, ncommits_str) == -1) {
2310 			err = got_error_from_errno("asprintf");
2311 			header = NULL;
2312 			goto done;
2313 		}
2314 	} else if (asprintf(&header, "commit %s%s",
2315 	    id_str ? id_str : "........................................",
2316 	    ncommits_str) == -1) {
2317 		err = got_error_from_errno("asprintf");
2318 		header = NULL;
2319 		goto done;
2320 	}
2321 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2322 	if (err)
2323 		goto done;
2324 
2325 	werase(view->window);
2326 
2327 	if (view_needs_focus_indication(view))
2328 		wstandout(view->window);
2329 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2330 	if (tc)
2331 		wattr_on(view->window,
2332 		    COLOR_PAIR(tc->colorpair), NULL);
2333 	waddwstr(view->window, wline);
2334 	if (tc)
2335 		wattr_off(view->window,
2336 		    COLOR_PAIR(tc->colorpair), NULL);
2337 	while (width < view->ncols) {
2338 		waddch(view->window, ' ');
2339 		width++;
2340 	}
2341 	if (view_needs_focus_indication(view))
2342 		wstandend(view->window);
2343 	free(wline);
2344 	if (limit <= 1)
2345 		goto done;
2346 
2347 	/* Grow author column size if necessary, and set view->maxx. */
2348 	entry = s->first_displayed_entry;
2349 	ncommits = 0;
2350 	view->maxx = 0;
2351 	while (entry) {
2352 		struct got_commit_object *c = entry->commit;
2353 		char *author, *eol, *msg, *msg0;
2354 		wchar_t *wauthor, *wmsg;
2355 		int width;
2356 		if (ncommits >= limit - 1)
2357 			break;
2358 		if (s->use_committer)
2359 			author = strdup(got_object_commit_get_committer(c));
2360 		else
2361 			author = strdup(got_object_commit_get_author(c));
2362 		if (author == NULL) {
2363 			err = got_error_from_errno("strdup");
2364 			goto done;
2365 		}
2366 		err = format_author(&wauthor, &width, author, COLS,
2367 		    date_display_cols);
2368 		if (author_cols < width)
2369 			author_cols = width;
2370 		free(wauthor);
2371 		free(author);
2372 		if (err)
2373 			goto done;
2374 		err = got_object_commit_get_logmsg(&msg0, c);
2375 		if (err)
2376 			goto done;
2377 		msg = msg0;
2378 		while (*msg == '\n')
2379 			++msg;
2380 		if ((eol = strchr(msg, '\n')))
2381 			*eol = '\0';
2382 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2383 		    date_display_cols + author_cols, 0);
2384 		if (err)
2385 			goto done;
2386 		view->maxx = MAX(view->maxx, width);
2387 		free(msg0);
2388 		free(wmsg);
2389 		ncommits++;
2390 		entry = TAILQ_NEXT(entry, entry);
2391 	}
2392 
2393 	entry = s->first_displayed_entry;
2394 	s->last_displayed_entry = s->first_displayed_entry;
2395 	ncommits = 0;
2396 	while (entry) {
2397 		if (ncommits >= limit - 1)
2398 			break;
2399 		if (ncommits == s->selected)
2400 			wstandout(view->window);
2401 		err = draw_commit(view, entry->commit, entry->id,
2402 		    date_display_cols, author_cols);
2403 		if (ncommits == s->selected)
2404 			wstandend(view->window);
2405 		if (err)
2406 			goto done;
2407 		ncommits++;
2408 		s->last_displayed_entry = entry;
2409 		entry = TAILQ_NEXT(entry, entry);
2410 	}
2411 
2412 	view_border(view);
2413 done:
2414 	free(id_str);
2415 	free(refs_str);
2416 	free(ncommits_str);
2417 	free(header);
2418 	return err;
2419 }
2420 
2421 static void
2422 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2423 {
2424 	struct commit_queue_entry *entry;
2425 	int nscrolled = 0;
2426 
2427 	entry = TAILQ_FIRST(&s->commits.head);
2428 	if (s->first_displayed_entry == entry)
2429 		return;
2430 
2431 	entry = s->first_displayed_entry;
2432 	while (entry && nscrolled < maxscroll) {
2433 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2434 		if (entry) {
2435 			s->first_displayed_entry = entry;
2436 			nscrolled++;
2437 		}
2438 	}
2439 }
2440 
2441 static const struct got_error *
2442 trigger_log_thread(struct tog_view *view, int wait)
2443 {
2444 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2445 	int errcode;
2446 
2447 	halfdelay(1); /* fast refresh while loading commits */
2448 
2449 	while (!ta->log_complete && !tog_thread_error &&
2450 	    (ta->commits_needed > 0 || ta->load_all)) {
2451 		/* Wake the log thread. */
2452 		errcode = pthread_cond_signal(&ta->need_commits);
2453 		if (errcode)
2454 			return got_error_set_errno(errcode,
2455 			    "pthread_cond_signal");
2456 
2457 		/*
2458 		 * The mutex will be released while the view loop waits
2459 		 * in wgetch(), at which time the log thread will run.
2460 		 */
2461 		if (!wait)
2462 			break;
2463 
2464 		/* Display progress update in log view. */
2465 		show_log_view(view);
2466 		update_panels();
2467 		doupdate();
2468 
2469 		/* Wait right here while next commit is being loaded. */
2470 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2471 		if (errcode)
2472 			return got_error_set_errno(errcode,
2473 			    "pthread_cond_wait");
2474 
2475 		/* Display progress update in log view. */
2476 		show_log_view(view);
2477 		update_panels();
2478 		doupdate();
2479 	}
2480 
2481 	return NULL;
2482 }
2483 
2484 static const struct got_error *
2485 request_log_commits(struct tog_view *view)
2486 {
2487 	struct tog_log_view_state	*state = &view->state.log;
2488 	const struct got_error		*err = NULL;
2489 
2490 	if (state->thread_args.log_complete)
2491 		return NULL;
2492 
2493 	state->thread_args.commits_needed += view->nscrolled;
2494 	err = trigger_log_thread(view, 1);
2495 	view->nscrolled = 0;
2496 
2497 	return err;
2498 }
2499 
2500 static const struct got_error *
2501 log_scroll_down(struct tog_view *view, int maxscroll)
2502 {
2503 	struct tog_log_view_state *s = &view->state.log;
2504 	const struct got_error *err = NULL;
2505 	struct commit_queue_entry *pentry;
2506 	int nscrolled = 0, ncommits_needed;
2507 
2508 	if (s->last_displayed_entry == NULL)
2509 		return NULL;
2510 
2511 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2512 	if (s->commits.ncommits < ncommits_needed &&
2513 	    !s->thread_args.log_complete) {
2514 		/*
2515 		 * Ask the log thread for required amount of commits.
2516 		 */
2517 		s->thread_args.commits_needed +=
2518 		    ncommits_needed - s->commits.ncommits;
2519 		err = trigger_log_thread(view, 1);
2520 		if (err)
2521 			return err;
2522 	}
2523 
2524 	do {
2525 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2526 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2527 			break;
2528 
2529 		s->last_displayed_entry = pentry ?
2530 		    pentry : s->last_displayed_entry;;
2531 
2532 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2533 		if (pentry == NULL)
2534 			break;
2535 		s->first_displayed_entry = pentry;
2536 	} while (++nscrolled < maxscroll);
2537 
2538 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2539 		view->nscrolled += nscrolled;
2540 	else
2541 		view->nscrolled = 0;
2542 
2543 	return err;
2544 }
2545 
2546 static const struct got_error *
2547 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2548     struct got_commit_object *commit, struct got_object_id *commit_id,
2549     struct tog_view *log_view, struct got_repository *repo)
2550 {
2551 	const struct got_error *err;
2552 	struct got_object_qid *parent_id;
2553 	struct tog_view *diff_view;
2554 
2555 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2556 	if (diff_view == NULL)
2557 		return got_error_from_errno("view_open");
2558 
2559 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2560 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2561 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2562 	if (err == NULL)
2563 		*new_view = diff_view;
2564 	return err;
2565 }
2566 
2567 static const struct got_error *
2568 tree_view_visit_subtree(struct tog_tree_view_state *s,
2569     struct got_tree_object *subtree)
2570 {
2571 	struct tog_parent_tree *parent;
2572 
2573 	parent = calloc(1, sizeof(*parent));
2574 	if (parent == NULL)
2575 		return got_error_from_errno("calloc");
2576 
2577 	parent->tree = s->tree;
2578 	parent->first_displayed_entry = s->first_displayed_entry;
2579 	parent->selected_entry = s->selected_entry;
2580 	parent->selected = s->selected;
2581 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2582 	s->tree = subtree;
2583 	s->selected = 0;
2584 	s->first_displayed_entry = NULL;
2585 	return NULL;
2586 }
2587 
2588 static const struct got_error *
2589 tree_view_walk_path(struct tog_tree_view_state *s,
2590     struct got_commit_object *commit, const char *path)
2591 {
2592 	const struct got_error *err = NULL;
2593 	struct got_tree_object *tree = NULL;
2594 	const char *p;
2595 	char *slash, *subpath = NULL;
2596 
2597 	/* Walk the path and open corresponding tree objects. */
2598 	p = path;
2599 	while (*p) {
2600 		struct got_tree_entry *te;
2601 		struct got_object_id *tree_id;
2602 		char *te_name;
2603 
2604 		while (p[0] == '/')
2605 			p++;
2606 
2607 		/* Ensure the correct subtree entry is selected. */
2608 		slash = strchr(p, '/');
2609 		if (slash == NULL)
2610 			te_name = strdup(p);
2611 		else
2612 			te_name = strndup(p, slash - p);
2613 		if (te_name == NULL) {
2614 			err = got_error_from_errno("strndup");
2615 			break;
2616 		}
2617 		te = got_object_tree_find_entry(s->tree, te_name);
2618 		if (te == NULL) {
2619 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2620 			free(te_name);
2621 			break;
2622 		}
2623 		free(te_name);
2624 		s->first_displayed_entry = s->selected_entry = te;
2625 
2626 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2627 			break; /* jump to this file's entry */
2628 
2629 		slash = strchr(p, '/');
2630 		if (slash)
2631 			subpath = strndup(path, slash - path);
2632 		else
2633 			subpath = strdup(path);
2634 		if (subpath == NULL) {
2635 			err = got_error_from_errno("strdup");
2636 			break;
2637 		}
2638 
2639 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2640 		    subpath);
2641 		if (err)
2642 			break;
2643 
2644 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2645 		free(tree_id);
2646 		if (err)
2647 			break;
2648 
2649 		err = tree_view_visit_subtree(s, tree);
2650 		if (err) {
2651 			got_object_tree_close(tree);
2652 			break;
2653 		}
2654 		if (slash == NULL)
2655 			break;
2656 		free(subpath);
2657 		subpath = NULL;
2658 		p = slash;
2659 	}
2660 
2661 	free(subpath);
2662 	return err;
2663 }
2664 
2665 static const struct got_error *
2666 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2667     struct commit_queue_entry *entry, const char *path,
2668     const char *head_ref_name, struct got_repository *repo)
2669 {
2670 	const struct got_error *err = NULL;
2671 	struct tog_tree_view_state *s;
2672 	struct tog_view *tree_view;
2673 
2674 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2675 	if (tree_view == NULL)
2676 		return got_error_from_errno("view_open");
2677 
2678 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2679 	if (err)
2680 		return err;
2681 	s = &tree_view->state.tree;
2682 
2683 	*new_view = tree_view;
2684 
2685 	if (got_path_is_root_dir(path))
2686 		return NULL;
2687 
2688 	return tree_view_walk_path(s, entry->commit, path);
2689 }
2690 
2691 static const struct got_error *
2692 block_signals_used_by_main_thread(void)
2693 {
2694 	sigset_t sigset;
2695 	int errcode;
2696 
2697 	if (sigemptyset(&sigset) == -1)
2698 		return got_error_from_errno("sigemptyset");
2699 
2700 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2701 	if (sigaddset(&sigset, SIGWINCH) == -1)
2702 		return got_error_from_errno("sigaddset");
2703 	if (sigaddset(&sigset, SIGCONT) == -1)
2704 		return got_error_from_errno("sigaddset");
2705 	if (sigaddset(&sigset, SIGINT) == -1)
2706 		return got_error_from_errno("sigaddset");
2707 	if (sigaddset(&sigset, SIGTERM) == -1)
2708 		return got_error_from_errno("sigaddset");
2709 
2710 	/* ncurses handles SIGTSTP */
2711 	if (sigaddset(&sigset, SIGTSTP) == -1)
2712 		return got_error_from_errno("sigaddset");
2713 
2714 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2715 	if (errcode)
2716 		return got_error_set_errno(errcode, "pthread_sigmask");
2717 
2718 	return NULL;
2719 }
2720 
2721 static void *
2722 log_thread(void *arg)
2723 {
2724 	const struct got_error *err = NULL;
2725 	int errcode = 0;
2726 	struct tog_log_thread_args *a = arg;
2727 	int done = 0;
2728 
2729 	/*
2730 	 * Sync startup with main thread such that we begin our
2731 	 * work once view_input() has released the mutex.
2732 	 */
2733 	errcode = pthread_mutex_lock(&tog_mutex);
2734 	if (errcode) {
2735 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2736 		return (void *)err;
2737 	}
2738 
2739 	err = block_signals_used_by_main_thread();
2740 	if (err) {
2741 		pthread_mutex_unlock(&tog_mutex);
2742 		goto done;
2743 	}
2744 
2745 	while (!done && !err && !tog_fatal_signal_received()) {
2746 		errcode = pthread_mutex_unlock(&tog_mutex);
2747 		if (errcode) {
2748 			err = got_error_set_errno(errcode,
2749 			    "pthread_mutex_unlock");
2750 			goto done;
2751 		}
2752 		err = queue_commits(a);
2753 		if (err) {
2754 			if (err->code != GOT_ERR_ITER_COMPLETED)
2755 				goto done;
2756 			err = NULL;
2757 			done = 1;
2758 		} else if (a->commits_needed > 0 && !a->load_all)
2759 			a->commits_needed--;
2760 
2761 		errcode = pthread_mutex_lock(&tog_mutex);
2762 		if (errcode) {
2763 			err = got_error_set_errno(errcode,
2764 			    "pthread_mutex_lock");
2765 			goto done;
2766 		} else if (*a->quit)
2767 			done = 1;
2768 		else if (*a->first_displayed_entry == NULL) {
2769 			*a->first_displayed_entry =
2770 			    TAILQ_FIRST(&a->commits->head);
2771 			*a->selected_entry = *a->first_displayed_entry;
2772 		}
2773 
2774 		errcode = pthread_cond_signal(&a->commit_loaded);
2775 		if (errcode) {
2776 			err = got_error_set_errno(errcode,
2777 			    "pthread_cond_signal");
2778 			pthread_mutex_unlock(&tog_mutex);
2779 			goto done;
2780 		}
2781 
2782 		if (done)
2783 			a->commits_needed = 0;
2784 		else {
2785 			if (a->commits_needed == 0 && !a->load_all) {
2786 				errcode = pthread_cond_wait(&a->need_commits,
2787 				    &tog_mutex);
2788 				if (errcode) {
2789 					err = got_error_set_errno(errcode,
2790 					    "pthread_cond_wait");
2791 					pthread_mutex_unlock(&tog_mutex);
2792 					goto done;
2793 				}
2794 				if (*a->quit)
2795 					done = 1;
2796 			}
2797 		}
2798 	}
2799 	a->log_complete = 1;
2800 	errcode = pthread_mutex_unlock(&tog_mutex);
2801 	if (errcode)
2802 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2803 done:
2804 	if (err) {
2805 		tog_thread_error = 1;
2806 		pthread_cond_signal(&a->commit_loaded);
2807 	}
2808 	return (void *)err;
2809 }
2810 
2811 static const struct got_error *
2812 stop_log_thread(struct tog_log_view_state *s)
2813 {
2814 	const struct got_error *err = NULL, *thread_err = NULL;
2815 	int errcode;
2816 
2817 	if (s->thread) {
2818 		s->quit = 1;
2819 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2820 		if (errcode)
2821 			return got_error_set_errno(errcode,
2822 			    "pthread_cond_signal");
2823 		errcode = pthread_mutex_unlock(&tog_mutex);
2824 		if (errcode)
2825 			return got_error_set_errno(errcode,
2826 			    "pthread_mutex_unlock");
2827 		errcode = pthread_join(s->thread, (void **)&thread_err);
2828 		if (errcode)
2829 			return got_error_set_errno(errcode, "pthread_join");
2830 		errcode = pthread_mutex_lock(&tog_mutex);
2831 		if (errcode)
2832 			return got_error_set_errno(errcode,
2833 			    "pthread_mutex_lock");
2834 		s->thread = 0; //NULL;
2835 	}
2836 
2837 	if (s->thread_args.repo) {
2838 		err = got_repo_close(s->thread_args.repo);
2839 		s->thread_args.repo = NULL;
2840 	}
2841 
2842 	if (s->thread_args.pack_fds) {
2843 		const struct got_error *pack_err =
2844 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2845 		if (err == NULL)
2846 			err = pack_err;
2847 		s->thread_args.pack_fds = NULL;
2848 	}
2849 
2850 	if (s->thread_args.graph) {
2851 		got_commit_graph_close(s->thread_args.graph);
2852 		s->thread_args.graph = NULL;
2853 	}
2854 
2855 	return err ? err : thread_err;
2856 }
2857 
2858 static const struct got_error *
2859 close_log_view(struct tog_view *view)
2860 {
2861 	const struct got_error *err = NULL;
2862 	struct tog_log_view_state *s = &view->state.log;
2863 	int errcode;
2864 
2865 	err = stop_log_thread(s);
2866 
2867 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2868 	if (errcode && err == NULL)
2869 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2870 
2871 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2872 	if (errcode && err == NULL)
2873 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2874 
2875 	free_commits(&s->commits);
2876 	free(s->in_repo_path);
2877 	s->in_repo_path = NULL;
2878 	free(s->start_id);
2879 	s->start_id = NULL;
2880 	free(s->head_ref_name);
2881 	s->head_ref_name = NULL;
2882 	return err;
2883 }
2884 
2885 static const struct got_error *
2886 search_start_log_view(struct tog_view *view)
2887 {
2888 	struct tog_log_view_state *s = &view->state.log;
2889 
2890 	s->matched_entry = NULL;
2891 	s->search_entry = NULL;
2892 	return NULL;
2893 }
2894 
2895 static const struct got_error *
2896 search_next_log_view(struct tog_view *view)
2897 {
2898 	const struct got_error *err = NULL;
2899 	struct tog_log_view_state *s = &view->state.log;
2900 	struct commit_queue_entry *entry;
2901 
2902 	/* Display progress update in log view. */
2903 	show_log_view(view);
2904 	update_panels();
2905 	doupdate();
2906 
2907 	if (s->search_entry) {
2908 		int errcode, ch;
2909 		errcode = pthread_mutex_unlock(&tog_mutex);
2910 		if (errcode)
2911 			return got_error_set_errno(errcode,
2912 			    "pthread_mutex_unlock");
2913 		ch = wgetch(view->window);
2914 		errcode = pthread_mutex_lock(&tog_mutex);
2915 		if (errcode)
2916 			return got_error_set_errno(errcode,
2917 			    "pthread_mutex_lock");
2918 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2919 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2920 			return NULL;
2921 		}
2922 		if (view->searching == TOG_SEARCH_FORWARD)
2923 			entry = TAILQ_NEXT(s->search_entry, entry);
2924 		else
2925 			entry = TAILQ_PREV(s->search_entry,
2926 			    commit_queue_head, entry);
2927 	} else if (s->matched_entry) {
2928 		int matched_idx = s->matched_entry->idx;
2929 		int selected_idx = s->selected_entry->idx;
2930 
2931 		/*
2932 		 * If the user has moved the cursor after we hit a match,
2933 		 * the position from where we should continue searching
2934 		 * might have changed.
2935 		 */
2936 		if (view->searching == TOG_SEARCH_FORWARD) {
2937 			if (matched_idx > selected_idx)
2938 				entry = TAILQ_NEXT(s->selected_entry, entry);
2939 			else
2940 				entry = TAILQ_NEXT(s->matched_entry, entry);
2941 		} else {
2942 			if (matched_idx < selected_idx)
2943 				entry = TAILQ_PREV(s->selected_entry,
2944 						commit_queue_head, entry);
2945 			else
2946 				entry = TAILQ_PREV(s->matched_entry,
2947 						commit_queue_head, entry);
2948 		}
2949 	} else {
2950 		entry = s->selected_entry;
2951 	}
2952 
2953 	while (1) {
2954 		int have_match = 0;
2955 
2956 		if (entry == NULL) {
2957 			if (s->thread_args.log_complete ||
2958 			    view->searching == TOG_SEARCH_BACKWARD) {
2959 				view->search_next_done =
2960 				    (s->matched_entry == NULL ?
2961 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2962 				s->search_entry = NULL;
2963 				return NULL;
2964 			}
2965 			/*
2966 			 * Poke the log thread for more commits and return,
2967 			 * allowing the main loop to make progress. Search
2968 			 * will resume at s->search_entry once we come back.
2969 			 */
2970 			s->thread_args.commits_needed++;
2971 			return trigger_log_thread(view, 0);
2972 		}
2973 
2974 		err = match_commit(&have_match, entry->id, entry->commit,
2975 		    &view->regex);
2976 		if (err)
2977 			break;
2978 		if (have_match) {
2979 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2980 			s->matched_entry = entry;
2981 			break;
2982 		}
2983 
2984 		s->search_entry = entry;
2985 		if (view->searching == TOG_SEARCH_FORWARD)
2986 			entry = TAILQ_NEXT(entry, entry);
2987 		else
2988 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2989 	}
2990 
2991 	if (s->matched_entry) {
2992 		int cur = s->selected_entry->idx;
2993 		while (cur < s->matched_entry->idx) {
2994 			err = input_log_view(NULL, view, KEY_DOWN);
2995 			if (err)
2996 				return err;
2997 			cur++;
2998 		}
2999 		while (cur > s->matched_entry->idx) {
3000 			err = input_log_view(NULL, view, KEY_UP);
3001 			if (err)
3002 				return err;
3003 			cur--;
3004 		}
3005 	}
3006 
3007 	s->search_entry = NULL;
3008 
3009 	return NULL;
3010 }
3011 
3012 static const struct got_error *
3013 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3014     struct got_repository *repo, const char *head_ref_name,
3015     const char *in_repo_path, int log_branches)
3016 {
3017 	const struct got_error *err = NULL;
3018 	struct tog_log_view_state *s = &view->state.log;
3019 	struct got_repository *thread_repo = NULL;
3020 	struct got_commit_graph *thread_graph = NULL;
3021 	int errcode;
3022 
3023 	if (in_repo_path != s->in_repo_path) {
3024 		free(s->in_repo_path);
3025 		s->in_repo_path = strdup(in_repo_path);
3026 		if (s->in_repo_path == NULL)
3027 			return got_error_from_errno("strdup");
3028 	}
3029 
3030 	/* The commit queue only contains commits being displayed. */
3031 	TAILQ_INIT(&s->commits.head);
3032 	s->commits.ncommits = 0;
3033 
3034 	s->repo = repo;
3035 	if (head_ref_name) {
3036 		s->head_ref_name = strdup(head_ref_name);
3037 		if (s->head_ref_name == NULL) {
3038 			err = got_error_from_errno("strdup");
3039 			goto done;
3040 		}
3041 	}
3042 	s->start_id = got_object_id_dup(start_id);
3043 	if (s->start_id == NULL) {
3044 		err = got_error_from_errno("got_object_id_dup");
3045 		goto done;
3046 	}
3047 	s->log_branches = log_branches;
3048 
3049 	STAILQ_INIT(&s->colors);
3050 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3051 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3052 		    get_color_value("TOG_COLOR_COMMIT"));
3053 		if (err)
3054 			goto done;
3055 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3056 		    get_color_value("TOG_COLOR_AUTHOR"));
3057 		if (err) {
3058 			free_colors(&s->colors);
3059 			goto done;
3060 		}
3061 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3062 		    get_color_value("TOG_COLOR_DATE"));
3063 		if (err) {
3064 			free_colors(&s->colors);
3065 			goto done;
3066 		}
3067 	}
3068 
3069 	view->show = show_log_view;
3070 	view->input = input_log_view;
3071 	view->resize = resize_log_view;
3072 	view->close = close_log_view;
3073 	view->search_start = search_start_log_view;
3074 	view->search_next = search_next_log_view;
3075 
3076 	if (s->thread_args.pack_fds == NULL) {
3077 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3078 		if (err)
3079 			goto done;
3080 	}
3081 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3082 	    s->thread_args.pack_fds);
3083 	if (err)
3084 		goto done;
3085 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3086 	    !s->log_branches);
3087 	if (err)
3088 		goto done;
3089 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3090 	    s->repo, NULL, NULL);
3091 	if (err)
3092 		goto done;
3093 
3094 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3095 	if (errcode) {
3096 		err = got_error_set_errno(errcode, "pthread_cond_init");
3097 		goto done;
3098 	}
3099 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3100 	if (errcode) {
3101 		err = got_error_set_errno(errcode, "pthread_cond_init");
3102 		goto done;
3103 	}
3104 
3105 	s->thread_args.commits_needed = view->nlines;
3106 	s->thread_args.graph = thread_graph;
3107 	s->thread_args.commits = &s->commits;
3108 	s->thread_args.in_repo_path = s->in_repo_path;
3109 	s->thread_args.start_id = s->start_id;
3110 	s->thread_args.repo = thread_repo;
3111 	s->thread_args.log_complete = 0;
3112 	s->thread_args.quit = &s->quit;
3113 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3114 	s->thread_args.selected_entry = &s->selected_entry;
3115 	s->thread_args.searching = &view->searching;
3116 	s->thread_args.search_next_done = &view->search_next_done;
3117 	s->thread_args.regex = &view->regex;
3118 done:
3119 	if (err)
3120 		close_log_view(view);
3121 	return err;
3122 }
3123 
3124 static const struct got_error *
3125 show_log_view(struct tog_view *view)
3126 {
3127 	const struct got_error *err;
3128 	struct tog_log_view_state *s = &view->state.log;
3129 
3130 	if (s->thread == 0) { //NULL) {
3131 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3132 		    &s->thread_args);
3133 		if (errcode)
3134 			return got_error_set_errno(errcode, "pthread_create");
3135 		if (s->thread_args.commits_needed > 0) {
3136 			err = trigger_log_thread(view, 1);
3137 			if (err)
3138 				return err;
3139 		}
3140 	}
3141 
3142 	return draw_commits(view);
3143 }
3144 
3145 static void
3146 log_move_cursor_up(struct tog_view *view, int page, int home)
3147 {
3148 	struct tog_log_view_state *s = &view->state.log;
3149 
3150 	if (s->selected_entry->idx == 0)
3151 		view->count = 0;
3152 	if (s->first_displayed_entry == NULL)
3153 		return;
3154 
3155 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3156 	    || home)
3157 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3158 
3159 	if (!page && !home && s->selected > 0)
3160 		--s->selected;
3161 	else
3162 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3163 
3164 	select_commit(s);
3165 	return;
3166 }
3167 
3168 static const struct got_error *
3169 log_move_cursor_down(struct tog_view *view, int page)
3170 {
3171 	struct tog_log_view_state	*s = &view->state.log;
3172 	const struct got_error		*err = NULL;
3173 	int				 eos = view->nlines - 2;
3174 
3175 	if (s->thread_args.log_complete &&
3176 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3177 		return NULL;
3178 
3179 	if (view_is_hsplit_top(view))
3180 		--eos;  /* border consumes the last line */
3181 
3182 	if (!page) {
3183 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3184 			++s->selected;
3185 		else
3186 			err = log_scroll_down(view, 1);
3187 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3188 		struct commit_queue_entry *entry;
3189 		int n;
3190 
3191 		s->selected = 0;
3192 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3193 		s->last_displayed_entry = entry;
3194 		for (n = 0; n <= eos; n++) {
3195 			if (entry == NULL)
3196 				break;
3197 			s->first_displayed_entry = entry;
3198 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3199 		}
3200 		if (n > 0)
3201 			s->selected = n - 1;
3202 	} else {
3203 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1 &&
3204 		    s->thread_args.log_complete)
3205 			s->selected += MIN(page,
3206 			    s->commits.ncommits - s->selected_entry->idx - 1);
3207 		else
3208 			err = log_scroll_down(view, page);
3209 	}
3210 	if (err)
3211 		return err;
3212 
3213 	/*
3214 	 * We might necessarily overshoot in horizontal
3215 	 * splits; if so, select the last displayed commit.
3216 	 */
3217 	if (s->first_displayed_entry && s->last_displayed_entry) {
3218 		s->selected = MIN(s->selected,
3219 		    s->last_displayed_entry->idx -
3220 		    s->first_displayed_entry->idx);
3221 	}
3222 
3223 	select_commit(s);
3224 
3225 	if (s->thread_args.log_complete &&
3226 	    s->selected_entry->idx == s->commits.ncommits - 1)
3227 		view->count = 0;
3228 
3229 	return NULL;
3230 }
3231 
3232 static void
3233 view_get_split(struct tog_view *view, int *y, int *x)
3234 {
3235 	*x = 0;
3236 	*y = 0;
3237 
3238 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3239 		if (view->child && view->child->resized_y)
3240 			*y = view->child->resized_y;
3241 		else if (view->resized_y)
3242 			*y = view->resized_y;
3243 		else
3244 			*y = view_split_begin_y(view->lines);
3245 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3246 		if (view->child && view->child->resized_x)
3247 			*x = view->child->resized_x;
3248 		else if (view->resized_x)
3249 			*x = view->resized_x;
3250 		else
3251 			*x = view_split_begin_x(view->begin_x);
3252 	}
3253 }
3254 
3255 /* Split view horizontally at y and offset view->state->selected line. */
3256 static const struct got_error *
3257 view_init_hsplit(struct tog_view *view, int y)
3258 {
3259 	const struct got_error *err = NULL;
3260 
3261 	view->nlines = y;
3262 	view->ncols = COLS;
3263 	err = view_resize(view);
3264 	if (err)
3265 		return err;
3266 
3267 	err = offset_selection_down(view);
3268 
3269 	return err;
3270 }
3271 
3272 static const struct got_error *
3273 log_goto_line(struct tog_view *view, int nlines)
3274 {
3275 	const struct got_error		*err = NULL;
3276 	struct tog_log_view_state	*s = &view->state.log;
3277 	int				 g, idx = s->selected_entry->idx;
3278 
3279 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3280 		return NULL;
3281 
3282 	g = view->gline;
3283 	view->gline = 0;
3284 
3285 	if (g >= s->first_displayed_entry->idx + 1 &&
3286 	    g <= s->last_displayed_entry->idx + 1 &&
3287 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3288 		s->selected = g - s->first_displayed_entry->idx - 1;
3289 		select_commit(s);
3290 		return NULL;
3291 	}
3292 
3293 	if (idx + 1 < g) {
3294 		err = log_move_cursor_down(view, g - idx - 1);
3295 		if (!err && g > s->selected_entry->idx + 1)
3296 			err = log_move_cursor_down(view,
3297 			    g - s->first_displayed_entry->idx - 1);
3298 		if (err)
3299 			return err;
3300 	} else if (idx + 1 > g)
3301 		log_move_cursor_up(view, idx - g + 1, 0);
3302 
3303 	if (g < nlines && s->first_displayed_entry->idx == 0)
3304 		s->selected = g - 1;
3305 
3306 	select_commit(s);
3307 	return NULL;
3308 
3309 }
3310 
3311 static const struct got_error *
3312 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3313 {
3314 	const struct got_error *err = NULL;
3315 	struct tog_log_view_state *s = &view->state.log;
3316 	int eos, nscroll;
3317 
3318 	if (s->thread_args.load_all) {
3319 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3320 			s->thread_args.load_all = 0;
3321 		else if (s->thread_args.log_complete) {
3322 			err = log_move_cursor_down(view, s->commits.ncommits);
3323 			s->thread_args.load_all = 0;
3324 		}
3325 		if (err)
3326 			return err;
3327 	}
3328 
3329 	eos = nscroll = view->nlines - 1;
3330 	if (view_is_hsplit_top(view))
3331 		--eos;  /* border */
3332 
3333 	if (view->gline)
3334 		return log_goto_line(view, eos);
3335 
3336 	switch (ch) {
3337 	case 'q':
3338 		s->quit = 1;
3339 		break;
3340 	case '0':
3341 		view->x = 0;
3342 		break;
3343 	case '$':
3344 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3345 		view->count = 0;
3346 		break;
3347 	case KEY_RIGHT:
3348 	case 'l':
3349 		if (view->x + view->ncols / 2 < view->maxx)
3350 			view->x += 2;  /* move two columns right */
3351 		else
3352 			view->count = 0;
3353 		break;
3354 	case KEY_LEFT:
3355 	case 'h':
3356 		view->x -= MIN(view->x, 2);  /* move two columns back */
3357 		if (view->x <= 0)
3358 			view->count = 0;
3359 		break;
3360 	case 'k':
3361 	case KEY_UP:
3362 	case '<':
3363 	case ',':
3364 	case CTRL('p'):
3365 		log_move_cursor_up(view, 0, 0);
3366 		break;
3367 	case 'g':
3368 	case KEY_HOME:
3369 		log_move_cursor_up(view, 0, 1);
3370 		view->count = 0;
3371 		break;
3372 	case CTRL('u'):
3373 	case 'u':
3374 		nscroll /= 2;
3375 		/* FALL THROUGH */
3376 	case KEY_PPAGE:
3377 	case CTRL('b'):
3378 	case 'b':
3379 		log_move_cursor_up(view, nscroll, 0);
3380 		break;
3381 	case 'j':
3382 	case KEY_DOWN:
3383 	case '>':
3384 	case '.':
3385 	case CTRL('n'):
3386 		err = log_move_cursor_down(view, 0);
3387 		break;
3388 	case '@':
3389 		s->use_committer = !s->use_committer;
3390 		break;
3391 	case 'G':
3392 	case KEY_END: {
3393 		/* We don't know yet how many commits, so we're forced to
3394 		 * traverse them all. */
3395 		view->count = 0;
3396 		s->thread_args.load_all = 1;
3397 		if (!s->thread_args.log_complete)
3398 			return trigger_log_thread(view, 0);
3399 		err = log_move_cursor_down(view, s->commits.ncommits);
3400 		s->thread_args.load_all = 0;
3401 		break;
3402 	}
3403 	case CTRL('d'):
3404 	case 'd':
3405 		nscroll /= 2;
3406 		/* FALL THROUGH */
3407 	case KEY_NPAGE:
3408 	case CTRL('f'):
3409 	case 'f':
3410 	case ' ':
3411 		err = log_move_cursor_down(view, nscroll);
3412 		break;
3413 	case KEY_RESIZE:
3414 		if (s->selected > view->nlines - 2)
3415 			s->selected = view->nlines - 2;
3416 		if (s->selected > s->commits.ncommits - 1)
3417 			s->selected = s->commits.ncommits - 1;
3418 		select_commit(s);
3419 		if (s->commits.ncommits < view->nlines - 1 &&
3420 		    !s->thread_args.log_complete) {
3421 			s->thread_args.commits_needed += (view->nlines - 1) -
3422 			    s->commits.ncommits;
3423 			err = trigger_log_thread(view, 1);
3424 		}
3425 		break;
3426 	case KEY_ENTER:
3427 	case '\r':
3428 		view->count = 0;
3429 		if (s->selected_entry == NULL)
3430 			break;
3431 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3432 		break;
3433 	case 'T':
3434 		view->count = 0;
3435 		if (s->selected_entry == NULL)
3436 			break;
3437 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3438 		break;
3439 	case KEY_BACKSPACE:
3440 	case CTRL('l'):
3441 	case 'B':
3442 		view->count = 0;
3443 		if (ch == KEY_BACKSPACE &&
3444 		    got_path_is_root_dir(s->in_repo_path))
3445 			break;
3446 		err = stop_log_thread(s);
3447 		if (err)
3448 			return err;
3449 		if (ch == KEY_BACKSPACE) {
3450 			char *parent_path;
3451 			err = got_path_dirname(&parent_path, s->in_repo_path);
3452 			if (err)
3453 				return err;
3454 			free(s->in_repo_path);
3455 			s->in_repo_path = parent_path;
3456 			s->thread_args.in_repo_path = s->in_repo_path;
3457 		} else if (ch == CTRL('l')) {
3458 			struct got_object_id *start_id;
3459 			err = got_repo_match_object_id(&start_id, NULL,
3460 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3461 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3462 			if (err)
3463 				return err;
3464 			free(s->start_id);
3465 			s->start_id = start_id;
3466 			s->thread_args.start_id = s->start_id;
3467 		} else /* 'B' */
3468 			s->log_branches = !s->log_branches;
3469 
3470 		if (s->thread_args.pack_fds == NULL) {
3471 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3472 			if (err)
3473 				return err;
3474 		}
3475 		err = got_repo_open(&s->thread_args.repo,
3476 		    got_repo_get_path(s->repo), NULL,
3477 		    s->thread_args.pack_fds);
3478 		if (err)
3479 			return err;
3480 		tog_free_refs();
3481 		err = tog_load_refs(s->repo, 0);
3482 		if (err)
3483 			return err;
3484 		err = got_commit_graph_open(&s->thread_args.graph,
3485 		    s->in_repo_path, !s->log_branches);
3486 		if (err)
3487 			return err;
3488 		err = got_commit_graph_iter_start(s->thread_args.graph,
3489 		    s->start_id, s->repo, NULL, NULL);
3490 		if (err)
3491 			return err;
3492 		free_commits(&s->commits);
3493 		s->first_displayed_entry = NULL;
3494 		s->last_displayed_entry = NULL;
3495 		s->selected_entry = NULL;
3496 		s->selected = 0;
3497 		s->thread_args.log_complete = 0;
3498 		s->quit = 0;
3499 		s->thread_args.commits_needed = view->lines;
3500 		s->matched_entry = NULL;
3501 		s->search_entry = NULL;
3502 		view->offset = 0;
3503 		break;
3504 	case 'R':
3505 		view->count = 0;
3506 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3507 		break;
3508 	default:
3509 		view->count = 0;
3510 		break;
3511 	}
3512 
3513 	return err;
3514 }
3515 
3516 static const struct got_error *
3517 apply_unveil(const char *repo_path, const char *worktree_path)
3518 {
3519 	const struct got_error *error;
3520 
3521 #ifdef PROFILE
3522 	if (unveil("gmon.out", "rwc") != 0)
3523 		return got_error_from_errno2("unveil", "gmon.out");
3524 #endif
3525 	if (repo_path && unveil(repo_path, "r") != 0)
3526 		return got_error_from_errno2("unveil", repo_path);
3527 
3528 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3529 		return got_error_from_errno2("unveil", worktree_path);
3530 
3531 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3532 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3533 
3534 	error = got_privsep_unveil_exec_helpers();
3535 	if (error != NULL)
3536 		return error;
3537 
3538 	if (unveil(NULL, NULL) != 0)
3539 		return got_error_from_errno("unveil");
3540 
3541 	return NULL;
3542 }
3543 
3544 static void
3545 init_curses(void)
3546 {
3547 	/*
3548 	 * Override default signal handlers before starting ncurses.
3549 	 * This should prevent ncurses from installing its own
3550 	 * broken cleanup() signal handler.
3551 	 */
3552 	signal(SIGWINCH, tog_sigwinch);
3553 	signal(SIGPIPE, tog_sigpipe);
3554 	signal(SIGCONT, tog_sigcont);
3555 	signal(SIGINT, tog_sigint);
3556 	signal(SIGTERM, tog_sigterm);
3557 
3558 	initscr();
3559 	cbreak();
3560 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3561 	noecho();
3562 	nonl();
3563 	intrflush(stdscr, FALSE);
3564 	keypad(stdscr, TRUE);
3565 	curs_set(0);
3566 	if (getenv("TOG_COLORS") != NULL) {
3567 		start_color();
3568 		use_default_colors();
3569 	}
3570 }
3571 
3572 static const struct got_error *
3573 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3574     struct got_repository *repo, struct got_worktree *worktree)
3575 {
3576 	const struct got_error *err = NULL;
3577 
3578 	if (argc == 0) {
3579 		*in_repo_path = strdup("/");
3580 		if (*in_repo_path == NULL)
3581 			return got_error_from_errno("strdup");
3582 		return NULL;
3583 	}
3584 
3585 	if (worktree) {
3586 		const char *prefix = got_worktree_get_path_prefix(worktree);
3587 		char *p;
3588 
3589 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3590 		if (err)
3591 			return err;
3592 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3593 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3594 		    p) == -1) {
3595 			err = got_error_from_errno("asprintf");
3596 			*in_repo_path = NULL;
3597 		}
3598 		free(p);
3599 	} else
3600 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3601 
3602 	return err;
3603 }
3604 
3605 static const struct got_error *
3606 cmd_log(int argc, char *argv[])
3607 {
3608 	const struct got_error *error;
3609 	struct got_repository *repo = NULL;
3610 	struct got_worktree *worktree = NULL;
3611 	struct got_object_id *start_id = NULL;
3612 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3613 	char *start_commit = NULL, *label = NULL;
3614 	struct got_reference *ref = NULL;
3615 	const char *head_ref_name = NULL;
3616 	int ch, log_branches = 0;
3617 	struct tog_view *view;
3618 	int *pack_fds = NULL;
3619 
3620 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3621 		switch (ch) {
3622 		case 'b':
3623 			log_branches = 1;
3624 			break;
3625 		case 'c':
3626 			start_commit = optarg;
3627 			break;
3628 		case 'r':
3629 			repo_path = realpath(optarg, NULL);
3630 			if (repo_path == NULL)
3631 				return got_error_from_errno2("realpath",
3632 				    optarg);
3633 			break;
3634 		default:
3635 			usage_log();
3636 			/* NOTREACHED */
3637 		}
3638 	}
3639 
3640 	argc -= optind;
3641 	argv += optind;
3642 
3643 	if (argc > 1)
3644 		usage_log();
3645 
3646 	error = got_repo_pack_fds_open(&pack_fds);
3647 	if (error != NULL)
3648 		goto done;
3649 
3650 	if (repo_path == NULL) {
3651 		cwd = getcwd(NULL, 0);
3652 		if (cwd == NULL)
3653 			return got_error_from_errno("getcwd");
3654 		error = got_worktree_open(&worktree, cwd);
3655 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3656 			goto done;
3657 		if (worktree)
3658 			repo_path =
3659 			    strdup(got_worktree_get_repo_path(worktree));
3660 		else
3661 			repo_path = strdup(cwd);
3662 		if (repo_path == NULL) {
3663 			error = got_error_from_errno("strdup");
3664 			goto done;
3665 		}
3666 	}
3667 
3668 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3669 	if (error != NULL)
3670 		goto done;
3671 
3672 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3673 	    repo, worktree);
3674 	if (error)
3675 		goto done;
3676 
3677 	init_curses();
3678 
3679 	error = apply_unveil(got_repo_get_path(repo),
3680 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3681 	if (error)
3682 		goto done;
3683 
3684 	/* already loaded by tog_log_with_path()? */
3685 	if (TAILQ_EMPTY(&tog_refs)) {
3686 		error = tog_load_refs(repo, 0);
3687 		if (error)
3688 			goto done;
3689 	}
3690 
3691 	if (start_commit == NULL) {
3692 		error = got_repo_match_object_id(&start_id, &label,
3693 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3694 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3695 		if (error)
3696 			goto done;
3697 		head_ref_name = label;
3698 	} else {
3699 		error = got_ref_open(&ref, repo, start_commit, 0);
3700 		if (error == NULL)
3701 			head_ref_name = got_ref_get_name(ref);
3702 		else if (error->code != GOT_ERR_NOT_REF)
3703 			goto done;
3704 		error = got_repo_match_object_id(&start_id, NULL,
3705 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3706 		if (error)
3707 			goto done;
3708 	}
3709 
3710 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3711 	if (view == NULL) {
3712 		error = got_error_from_errno("view_open");
3713 		goto done;
3714 	}
3715 	error = open_log_view(view, start_id, repo, head_ref_name,
3716 	    in_repo_path, log_branches);
3717 	if (error)
3718 		goto done;
3719 	if (worktree) {
3720 		/* Release work tree lock. */
3721 		got_worktree_close(worktree);
3722 		worktree = NULL;
3723 	}
3724 	error = view_loop(view);
3725 done:
3726 	free(in_repo_path);
3727 	free(repo_path);
3728 	free(cwd);
3729 	free(start_id);
3730 	free(label);
3731 	if (ref)
3732 		got_ref_close(ref);
3733 	if (repo) {
3734 		const struct got_error *close_err = got_repo_close(repo);
3735 		if (error == NULL)
3736 			error = close_err;
3737 	}
3738 	if (worktree)
3739 		got_worktree_close(worktree);
3740 	if (pack_fds) {
3741 		const struct got_error *pack_err =
3742 		    got_repo_pack_fds_close(pack_fds);
3743 		if (error == NULL)
3744 			error = pack_err;
3745 	}
3746 	tog_free_refs();
3747 	return error;
3748 }
3749 
3750 __dead static void
3751 usage_diff(void)
3752 {
3753 	endwin();
3754 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
3755 	    "object1 object2\n", getprogname());
3756 	exit(1);
3757 }
3758 
3759 static int
3760 match_line(const char *line, regex_t *regex, size_t nmatch,
3761     regmatch_t *regmatch)
3762 {
3763 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3764 }
3765 
3766 static struct tog_color *
3767 match_color(struct tog_colors *colors, const char *line)
3768 {
3769 	struct tog_color *tc = NULL;
3770 
3771 	STAILQ_FOREACH(tc, colors, entry) {
3772 		if (match_line(line, &tc->regex, 0, NULL))
3773 			return tc;
3774 	}
3775 
3776 	return NULL;
3777 }
3778 
3779 static const struct got_error *
3780 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3781     WINDOW *window, int skipcol, regmatch_t *regmatch)
3782 {
3783 	const struct got_error *err = NULL;
3784 	char *exstr = NULL;
3785 	wchar_t *wline = NULL;
3786 	int rme, rms, n, width, scrollx;
3787 	int width0 = 0, width1 = 0, width2 = 0;
3788 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3789 
3790 	*wtotal = 0;
3791 
3792 	rms = regmatch->rm_so;
3793 	rme = regmatch->rm_eo;
3794 
3795 	err = expand_tab(&exstr, line);
3796 	if (err)
3797 		return err;
3798 
3799 	/* Split the line into 3 segments, according to match offsets. */
3800 	seg0 = strndup(exstr, rms);
3801 	if (seg0 == NULL) {
3802 		err = got_error_from_errno("strndup");
3803 		goto done;
3804 	}
3805 	seg1 = strndup(exstr + rms, rme - rms);
3806 	if (seg1 == NULL) {
3807 		err = got_error_from_errno("strndup");
3808 		goto done;
3809 	}
3810 	seg2 = strdup(exstr + rme);
3811 	if (seg2 == NULL) {
3812 		err = got_error_from_errno("strndup");
3813 		goto done;
3814 	}
3815 
3816 	/* draw up to matched token if we haven't scrolled past it */
3817 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3818 	    col_tab_align, 1);
3819 	if (err)
3820 		goto done;
3821 	n = MAX(width0 - skipcol, 0);
3822 	if (n) {
3823 		free(wline);
3824 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3825 		    wlimit, col_tab_align, 1);
3826 		if (err)
3827 			goto done;
3828 		waddwstr(window, &wline[scrollx]);
3829 		wlimit -= width;
3830 		*wtotal += width;
3831 	}
3832 
3833 	if (wlimit > 0) {
3834 		int i = 0, w = 0;
3835 		size_t wlen;
3836 
3837 		free(wline);
3838 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3839 		    col_tab_align, 1);
3840 		if (err)
3841 			goto done;
3842 		wlen = wcslen(wline);
3843 		while (i < wlen) {
3844 			width = wcwidth(wline[i]);
3845 			if (width == -1) {
3846 				/* should not happen, tabs are expanded */
3847 				err = got_error(GOT_ERR_RANGE);
3848 				goto done;
3849 			}
3850 			if (width0 + w + width > skipcol)
3851 				break;
3852 			w += width;
3853 			i++;
3854 		}
3855 		/* draw (visible part of) matched token (if scrolled into it) */
3856 		if (width1 - w > 0) {
3857 			wattron(window, A_STANDOUT);
3858 			waddwstr(window, &wline[i]);
3859 			wattroff(window, A_STANDOUT);
3860 			wlimit -= (width1 - w);
3861 			*wtotal += (width1 - w);
3862 		}
3863 	}
3864 
3865 	if (wlimit > 0) {  /* draw rest of line */
3866 		free(wline);
3867 		if (skipcol > width0 + width1) {
3868 			err = format_line(&wline, &width2, &scrollx, seg2,
3869 			    skipcol - (width0 + width1), wlimit,
3870 			    col_tab_align, 1);
3871 			if (err)
3872 				goto done;
3873 			waddwstr(window, &wline[scrollx]);
3874 		} else {
3875 			err = format_line(&wline, &width2, NULL, seg2, 0,
3876 			    wlimit, col_tab_align, 1);
3877 			if (err)
3878 				goto done;
3879 			waddwstr(window, wline);
3880 		}
3881 		*wtotal += width2;
3882 	}
3883 done:
3884 	free(wline);
3885 	free(exstr);
3886 	free(seg0);
3887 	free(seg1);
3888 	free(seg2);
3889 	return err;
3890 }
3891 
3892 static int
3893 gotoline(struct tog_view *view, int *lineno, int *nprinted)
3894 {
3895 	FILE	*f = NULL;
3896 	int	*eof, *first, *selected;
3897 
3898 	if (view->type == TOG_VIEW_DIFF) {
3899 		struct tog_diff_view_state *s = &view->state.diff;
3900 
3901 		first = &s->first_displayed_line;
3902 		selected = first;
3903 		eof = &s->eof;
3904 		f = s->f;
3905 	} else if (view->type == TOG_VIEW_BLAME) {
3906 		struct tog_blame_view_state *s = &view->state.blame;
3907 
3908 		first = &s->first_displayed_line;
3909 		selected = &s->selected_line;
3910 		eof = &s->eof;
3911 		f = s->blame.f;
3912 	} else
3913 		return 0;
3914 
3915 	/* Center gline in the middle of the page like vi(1). */
3916 	if (*lineno < view->gline - (view->nlines - 3) / 2)
3917 		return 0;
3918 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
3919 		rewind(f);
3920 		*eof = 0;
3921 		*first = 1;
3922 		*lineno = 0;
3923 		*nprinted = 0;
3924 		return 0;
3925 	}
3926 
3927 	*selected = view->gline <= (view->nlines - 3) / 2 ?
3928 		view->gline : (view->nlines - 3) / 2 + 1;
3929 	view->gline = 0;
3930 
3931 	return 1;
3932 }
3933 
3934 static const struct got_error *
3935 draw_file(struct tog_view *view, const char *header)
3936 {
3937 	struct tog_diff_view_state *s = &view->state.diff;
3938 	regmatch_t *regmatch = &view->regmatch;
3939 	const struct got_error *err;
3940 	int nprinted = 0;
3941 	char *line;
3942 	size_t linesize = 0;
3943 	ssize_t linelen;
3944 	wchar_t *wline;
3945 	int width;
3946 	int max_lines = view->nlines;
3947 	int nlines = s->nlines;
3948 	off_t line_offset;
3949 
3950 	s->lineno = s->first_displayed_line - 1;
3951 	line_offset = s->lines[s->first_displayed_line - 1].offset;
3952 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3953 		return got_error_from_errno("fseek");
3954 
3955 	werase(view->window);
3956 
3957 	if (view->gline > s->nlines - 1)
3958 		view->gline = s->nlines - 1;
3959 
3960 	if (header) {
3961 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
3962 		    1 : view->gline - (view->nlines - 3) / 2 :
3963 		    s->lineno + s->selected_line;
3964 
3965 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
3966 			return got_error_from_errno("asprintf");
3967 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3968 		    0, 0);
3969 		free(line);
3970 		if (err)
3971 			return err;
3972 
3973 		if (view_needs_focus_indication(view))
3974 			wstandout(view->window);
3975 		waddwstr(view->window, wline);
3976 		free(wline);
3977 		wline = NULL;
3978 		if (view_needs_focus_indication(view))
3979 			wstandend(view->window);
3980 		if (width <= view->ncols - 1)
3981 			waddch(view->window, '\n');
3982 
3983 		if (max_lines <= 1)
3984 			return NULL;
3985 		max_lines--;
3986 	}
3987 
3988 	s->eof = 0;
3989 	view->maxx = 0;
3990 	line = NULL;
3991 	while (max_lines > 0 && nprinted < max_lines) {
3992 		enum got_diff_line_type linetype;
3993 		attr_t attr = 0;
3994 
3995 		linelen = getline(&line, &linesize, s->f);
3996 		if (linelen == -1) {
3997 			if (feof(s->f)) {
3998 				s->eof = 1;
3999 				break;
4000 			}
4001 			free(line);
4002 			return got_ferror(s->f, GOT_ERR_IO);
4003 		}
4004 
4005 		if (++s->lineno < s->first_displayed_line)
4006 			continue;
4007 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4008 			continue;
4009 		if (s->lineno == view->hiline)
4010 			attr = A_STANDOUT;
4011 
4012 		/* Set view->maxx based on full line length. */
4013 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4014 		    view->x ? 1 : 0);
4015 		if (err) {
4016 			free(line);
4017 			return err;
4018 		}
4019 		view->maxx = MAX(view->maxx, width);
4020 		free(wline);
4021 		wline = NULL;
4022 
4023 		linetype = s->lines[s->lineno].type;
4024 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4025 		    linetype < GOT_DIFF_LINE_CONTEXT)
4026 			attr |= COLOR_PAIR(linetype);
4027 		if (attr)
4028 			wattron(view->window, attr);
4029 		if (s->first_displayed_line + nprinted == s->matched_line &&
4030 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4031 			err = add_matched_line(&width, line, view->ncols, 0,
4032 			    view->window, view->x, regmatch);
4033 			if (err) {
4034 				free(line);
4035 				return err;
4036 			}
4037 		} else {
4038 			int skip;
4039 			err = format_line(&wline, &width, &skip, line,
4040 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4041 			if (err) {
4042 				free(line);
4043 				return err;
4044 			}
4045 			waddwstr(view->window, &wline[skip]);
4046 			free(wline);
4047 			wline = NULL;
4048 		}
4049 		if (s->lineno == view->hiline) {
4050 			/* highlight full gline length */
4051 			while (width++ < view->ncols)
4052 				waddch(view->window, ' ');
4053 		} else {
4054 			if (width <= view->ncols - 1)
4055 				waddch(view->window, '\n');
4056 		}
4057 		if (attr)
4058 			wattroff(view->window, attr);
4059 		if (++nprinted == 1)
4060 			s->first_displayed_line = s->lineno;
4061 	}
4062 	free(line);
4063 	if (nprinted >= 1)
4064 		s->last_displayed_line = s->first_displayed_line +
4065 		    (nprinted - 1);
4066 	else
4067 		s->last_displayed_line = s->first_displayed_line;
4068 
4069 	view_border(view);
4070 
4071 	if (s->eof) {
4072 		while (nprinted < view->nlines) {
4073 			waddch(view->window, '\n');
4074 			nprinted++;
4075 		}
4076 
4077 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4078 		    view->ncols, 0, 0);
4079 		if (err) {
4080 			return err;
4081 		}
4082 
4083 		wstandout(view->window);
4084 		waddwstr(view->window, wline);
4085 		free(wline);
4086 		wline = NULL;
4087 		wstandend(view->window);
4088 	}
4089 
4090 	return NULL;
4091 }
4092 
4093 static char *
4094 get_datestr(time_t *time, char *datebuf)
4095 {
4096 	struct tm mytm, *tm;
4097 	char *p, *s;
4098 
4099 	tm = gmtime_r(time, &mytm);
4100 	if (tm == NULL)
4101 		return NULL;
4102 	s = asctime_r(tm, datebuf);
4103 	if (s == NULL)
4104 		return NULL;
4105 	p = strchr(s, '\n');
4106 	if (p)
4107 		*p = '\0';
4108 	return s;
4109 }
4110 
4111 static const struct got_error *
4112 get_changed_paths(struct got_pathlist_head *paths,
4113     struct got_commit_object *commit, struct got_repository *repo)
4114 {
4115 	const struct got_error *err = NULL;
4116 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4117 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4118 	struct got_object_qid *qid;
4119 
4120 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4121 	if (qid != NULL) {
4122 		struct got_commit_object *pcommit;
4123 		err = got_object_open_as_commit(&pcommit, repo,
4124 		    &qid->id);
4125 		if (err)
4126 			return err;
4127 
4128 		tree_id1 = got_object_id_dup(
4129 		    got_object_commit_get_tree_id(pcommit));
4130 		if (tree_id1 == NULL) {
4131 			got_object_commit_close(pcommit);
4132 			return got_error_from_errno("got_object_id_dup");
4133 		}
4134 		got_object_commit_close(pcommit);
4135 
4136 	}
4137 
4138 	if (tree_id1) {
4139 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4140 		if (err)
4141 			goto done;
4142 	}
4143 
4144 	tree_id2 = got_object_commit_get_tree_id(commit);
4145 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4146 	if (err)
4147 		goto done;
4148 
4149 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4150 	    got_diff_tree_collect_changed_paths, paths, 0);
4151 done:
4152 	if (tree1)
4153 		got_object_tree_close(tree1);
4154 	if (tree2)
4155 		got_object_tree_close(tree2);
4156 	free(tree_id1);
4157 	return err;
4158 }
4159 
4160 static const struct got_error *
4161 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4162     off_t off, uint8_t type)
4163 {
4164 	struct got_diff_line *p;
4165 
4166 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4167 	if (p == NULL)
4168 		return got_error_from_errno("reallocarray");
4169 	*lines = p;
4170 	(*lines)[*nlines].offset = off;
4171 	(*lines)[*nlines].type = type;
4172 	(*nlines)++;
4173 
4174 	return NULL;
4175 }
4176 
4177 static const struct got_error *
4178 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4179     struct got_object_id *commit_id, struct got_reflist_head *refs,
4180     struct got_repository *repo, FILE *outfile)
4181 {
4182 	const struct got_error *err = NULL;
4183 	char datebuf[26], *datestr;
4184 	struct got_commit_object *commit;
4185 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4186 	time_t committer_time;
4187 	const char *author, *committer;
4188 	char *refs_str = NULL;
4189 	struct got_pathlist_head changed_paths;
4190 	struct got_pathlist_entry *pe;
4191 	off_t outoff = 0;
4192 	int n;
4193 
4194 	TAILQ_INIT(&changed_paths);
4195 
4196 	if (refs) {
4197 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4198 		if (err)
4199 			return err;
4200 	}
4201 
4202 	err = got_object_open_as_commit(&commit, repo, commit_id);
4203 	if (err)
4204 		return err;
4205 
4206 	err = got_object_id_str(&id_str, commit_id);
4207 	if (err) {
4208 		err = got_error_from_errno("got_object_id_str");
4209 		goto done;
4210 	}
4211 
4212 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4213 	if (err)
4214 		goto done;
4215 
4216 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4217 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4218 	if (n < 0) {
4219 		err = got_error_from_errno("fprintf");
4220 		goto done;
4221 	}
4222 	outoff += n;
4223 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4224 	if (err)
4225 		goto done;
4226 
4227 	n = fprintf(outfile, "from: %s\n",
4228 	    got_object_commit_get_author(commit));
4229 	if (n < 0) {
4230 		err = got_error_from_errno("fprintf");
4231 		goto done;
4232 	}
4233 	outoff += n;
4234 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4235 	if (err)
4236 		goto done;
4237 
4238 	committer_time = got_object_commit_get_committer_time(commit);
4239 	datestr = get_datestr(&committer_time, datebuf);
4240 	if (datestr) {
4241 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4242 		if (n < 0) {
4243 			err = got_error_from_errno("fprintf");
4244 			goto done;
4245 		}
4246 		outoff += n;
4247 		err = add_line_metadata(lines, nlines, outoff,
4248 		    GOT_DIFF_LINE_DATE);
4249 		if (err)
4250 			goto done;
4251 	}
4252 	author = got_object_commit_get_author(commit);
4253 	committer = got_object_commit_get_committer(commit);
4254 	if (strcmp(author, committer) != 0) {
4255 		n = fprintf(outfile, "via: %s\n", committer);
4256 		if (n < 0) {
4257 			err = got_error_from_errno("fprintf");
4258 			goto done;
4259 		}
4260 		outoff += n;
4261 		err = add_line_metadata(lines, nlines, outoff,
4262 		    GOT_DIFF_LINE_AUTHOR);
4263 		if (err)
4264 			goto done;
4265 	}
4266 	if (got_object_commit_get_nparents(commit) > 1) {
4267 		const struct got_object_id_queue *parent_ids;
4268 		struct got_object_qid *qid;
4269 		int pn = 1;
4270 		parent_ids = got_object_commit_get_parent_ids(commit);
4271 		STAILQ_FOREACH(qid, parent_ids, entry) {
4272 			err = got_object_id_str(&id_str, &qid->id);
4273 			if (err)
4274 				goto done;
4275 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4276 			if (n < 0) {
4277 				err = got_error_from_errno("fprintf");
4278 				goto done;
4279 			}
4280 			outoff += n;
4281 			err = add_line_metadata(lines, nlines, outoff,
4282 			    GOT_DIFF_LINE_META);
4283 			if (err)
4284 				goto done;
4285 			free(id_str);
4286 			id_str = NULL;
4287 		}
4288 	}
4289 
4290 	err = got_object_commit_get_logmsg(&logmsg, commit);
4291 	if (err)
4292 		goto done;
4293 	s = logmsg;
4294 	while ((line = strsep(&s, "\n")) != NULL) {
4295 		n = fprintf(outfile, "%s\n", line);
4296 		if (n < 0) {
4297 			err = got_error_from_errno("fprintf");
4298 			goto done;
4299 		}
4300 		outoff += n;
4301 		err = add_line_metadata(lines, nlines, outoff,
4302 		    GOT_DIFF_LINE_LOGMSG);
4303 		if (err)
4304 			goto done;
4305 	}
4306 
4307 	err = get_changed_paths(&changed_paths, commit, repo);
4308 	if (err)
4309 		goto done;
4310 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4311 		struct got_diff_changed_path *cp = pe->data;
4312 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4313 		if (n < 0) {
4314 			err = got_error_from_errno("fprintf");
4315 			goto done;
4316 		}
4317 		outoff += n;
4318 		err = add_line_metadata(lines, nlines, outoff,
4319 		    GOT_DIFF_LINE_CHANGES);
4320 		if (err)
4321 			goto done;
4322 		free((char *)pe->path);
4323 		free(pe->data);
4324 	}
4325 
4326 	fputc('\n', outfile);
4327 	outoff++;
4328 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4329 done:
4330 	got_pathlist_free(&changed_paths);
4331 	free(id_str);
4332 	free(logmsg);
4333 	free(refs_str);
4334 	got_object_commit_close(commit);
4335 	if (err) {
4336 		free(*lines);
4337 		*lines = NULL;
4338 		*nlines = 0;
4339 	}
4340 	return err;
4341 }
4342 
4343 static const struct got_error *
4344 create_diff(struct tog_diff_view_state *s)
4345 {
4346 	const struct got_error *err = NULL;
4347 	FILE *f = NULL;
4348 	int obj_type;
4349 
4350 	free(s->lines);
4351 	s->lines = malloc(sizeof(*s->lines));
4352 	if (s->lines == NULL)
4353 		return got_error_from_errno("malloc");
4354 	s->nlines = 0;
4355 
4356 	f = got_opentemp();
4357 	if (f == NULL) {
4358 		err = got_error_from_errno("got_opentemp");
4359 		goto done;
4360 	}
4361 	if (s->f && fclose(s->f) == EOF) {
4362 		err = got_error_from_errno("fclose");
4363 		goto done;
4364 	}
4365 	s->f = f;
4366 
4367 	if (s->id1)
4368 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4369 	else
4370 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4371 	if (err)
4372 		goto done;
4373 
4374 	switch (obj_type) {
4375 	case GOT_OBJ_TYPE_BLOB:
4376 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4377 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4378 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4379 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4380 		break;
4381 	case GOT_OBJ_TYPE_TREE:
4382 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4383 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4384 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4385 		    s->force_text_diff, s->repo, s->f);
4386 		break;
4387 	case GOT_OBJ_TYPE_COMMIT: {
4388 		const struct got_object_id_queue *parent_ids;
4389 		struct got_object_qid *pid;
4390 		struct got_commit_object *commit2;
4391 		struct got_reflist_head *refs;
4392 
4393 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4394 		if (err)
4395 			goto done;
4396 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4397 		/* Show commit info if we're diffing to a parent/root commit. */
4398 		if (s->id1 == NULL) {
4399 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4400 			    refs, s->repo, s->f);
4401 			if (err)
4402 				goto done;
4403 		} else {
4404 			parent_ids = got_object_commit_get_parent_ids(commit2);
4405 			STAILQ_FOREACH(pid, parent_ids, entry) {
4406 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4407 					err = write_commit_info(&s->lines,
4408 					    &s->nlines, s->id2, refs, s->repo,
4409 					    s->f);
4410 					if (err)
4411 						goto done;
4412 					break;
4413 				}
4414 			}
4415 		}
4416 		got_object_commit_close(commit2);
4417 
4418 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4419 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4420 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4421 		    s->force_text_diff, s->repo, s->f);
4422 		break;
4423 	}
4424 	default:
4425 		err = got_error(GOT_ERR_OBJ_TYPE);
4426 		break;
4427 	}
4428 done:
4429 	if (s->f && fflush(s->f) != 0 && err == NULL)
4430 		err = got_error_from_errno("fflush");
4431 	return err;
4432 }
4433 
4434 static void
4435 diff_view_indicate_progress(struct tog_view *view)
4436 {
4437 	mvwaddstr(view->window, 0, 0, "diffing...");
4438 	update_panels();
4439 	doupdate();
4440 }
4441 
4442 static const struct got_error *
4443 search_start_diff_view(struct tog_view *view)
4444 {
4445 	struct tog_diff_view_state *s = &view->state.diff;
4446 
4447 	s->matched_line = 0;
4448 	return NULL;
4449 }
4450 
4451 static const struct got_error *
4452 search_next_diff_view(struct tog_view *view)
4453 {
4454 	struct tog_diff_view_state *s = &view->state.diff;
4455 	const struct got_error *err = NULL;
4456 	int lineno;
4457 	char *line = NULL;
4458 	size_t linesize = 0;
4459 	ssize_t linelen;
4460 
4461 	if (!view->searching) {
4462 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4463 		return NULL;
4464 	}
4465 
4466 	if (s->matched_line) {
4467 		if (view->searching == TOG_SEARCH_FORWARD)
4468 			lineno = s->matched_line + 1;
4469 		else
4470 			lineno = s->matched_line - 1;
4471 	} else
4472 		lineno = s->first_displayed_line;
4473 
4474 	while (1) {
4475 		off_t offset;
4476 
4477 		if (lineno <= 0 || lineno > s->nlines) {
4478 			if (s->matched_line == 0) {
4479 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4480 				break;
4481 			}
4482 
4483 			if (view->searching == TOG_SEARCH_FORWARD)
4484 				lineno = 1;
4485 			else
4486 				lineno = s->nlines;
4487 		}
4488 
4489 		offset = s->lines[lineno - 1].offset;
4490 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4491 			free(line);
4492 			return got_error_from_errno("fseeko");
4493 		}
4494 		linelen = getline(&line, &linesize, s->f);
4495 		if (linelen != -1) {
4496 			char *exstr;
4497 			err = expand_tab(&exstr, line);
4498 			if (err)
4499 				break;
4500 			if (match_line(exstr, &view->regex, 1,
4501 			    &view->regmatch)) {
4502 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4503 				s->matched_line = lineno;
4504 				free(exstr);
4505 				break;
4506 			}
4507 			free(exstr);
4508 		}
4509 		if (view->searching == TOG_SEARCH_FORWARD)
4510 			lineno++;
4511 		else
4512 			lineno--;
4513 	}
4514 	free(line);
4515 
4516 	if (s->matched_line) {
4517 		s->first_displayed_line = s->matched_line;
4518 		s->selected_line = 1;
4519 	}
4520 
4521 	return err;
4522 }
4523 
4524 static const struct got_error *
4525 close_diff_view(struct tog_view *view)
4526 {
4527 	const struct got_error *err = NULL;
4528 	struct tog_diff_view_state *s = &view->state.diff;
4529 
4530 	free(s->id1);
4531 	s->id1 = NULL;
4532 	free(s->id2);
4533 	s->id2 = NULL;
4534 	if (s->f && fclose(s->f) == EOF)
4535 		err = got_error_from_errno("fclose");
4536 	s->f = NULL;
4537 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4538 		err = got_error_from_errno("fclose");
4539 	s->f1 = NULL;
4540 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4541 		err = got_error_from_errno("fclose");
4542 	s->f2 = NULL;
4543 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4544 		err = got_error_from_errno("close");
4545 	s->fd1 = -1;
4546 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4547 		err = got_error_from_errno("close");
4548 	s->fd2 = -1;
4549 	free(s->lines);
4550 	s->lines = NULL;
4551 	s->nlines = 0;
4552 	return err;
4553 }
4554 
4555 static const struct got_error *
4556 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4557     struct got_object_id *id2, const char *label1, const char *label2,
4558     int diff_context, int ignore_whitespace, int force_text_diff,
4559     struct tog_view *parent_view, struct got_repository *repo)
4560 {
4561 	const struct got_error *err;
4562 	struct tog_diff_view_state *s = &view->state.diff;
4563 
4564 	memset(s, 0, sizeof(*s));
4565 	s->fd1 = -1;
4566 	s->fd2 = -1;
4567 
4568 	if (id1 != NULL && id2 != NULL) {
4569 	    int type1, type2;
4570 	    err = got_object_get_type(&type1, repo, id1);
4571 	    if (err)
4572 		return err;
4573 	    err = got_object_get_type(&type2, repo, id2);
4574 	    if (err)
4575 		return err;
4576 
4577 	    if (type1 != type2)
4578 		return got_error(GOT_ERR_OBJ_TYPE);
4579 	}
4580 	s->first_displayed_line = 1;
4581 	s->last_displayed_line = view->nlines;
4582 	s->selected_line = 1;
4583 	s->repo = repo;
4584 	s->id1 = id1;
4585 	s->id2 = id2;
4586 	s->label1 = label1;
4587 	s->label2 = label2;
4588 
4589 	if (id1) {
4590 		s->id1 = got_object_id_dup(id1);
4591 		if (s->id1 == NULL)
4592 			return got_error_from_errno("got_object_id_dup");
4593 	} else
4594 		s->id1 = NULL;
4595 
4596 	s->id2 = got_object_id_dup(id2);
4597 	if (s->id2 == NULL) {
4598 		err = got_error_from_errno("got_object_id_dup");
4599 		goto done;
4600 	}
4601 
4602 	s->f1 = got_opentemp();
4603 	if (s->f1 == NULL) {
4604 		err = got_error_from_errno("got_opentemp");
4605 		goto done;
4606 	}
4607 
4608 	s->f2 = got_opentemp();
4609 	if (s->f2 == NULL) {
4610 		err = got_error_from_errno("got_opentemp");
4611 		goto done;
4612 	}
4613 
4614 	s->fd1 = got_opentempfd();
4615 	if (s->fd1 == -1) {
4616 		err = got_error_from_errno("got_opentempfd");
4617 		goto done;
4618 	}
4619 
4620 	s->fd2 = got_opentempfd();
4621 	if (s->fd2 == -1) {
4622 		err = got_error_from_errno("got_opentempfd");
4623 		goto done;
4624 	}
4625 
4626 	s->first_displayed_line = 1;
4627 	s->last_displayed_line = view->nlines;
4628 	s->diff_context = diff_context;
4629 	s->ignore_whitespace = ignore_whitespace;
4630 	s->force_text_diff = force_text_diff;
4631 	s->parent_view = parent_view;
4632 	s->repo = repo;
4633 
4634 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4635 		int rc;
4636 
4637 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4638 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4639 		if (rc != ERR)
4640 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4641 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4642 		if (rc != ERR)
4643 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4644 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4645 		if (rc != ERR)
4646 			rc = init_pair(GOT_DIFF_LINE_META,
4647 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4648 		if (rc != ERR)
4649 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4650 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4651 		if (rc != ERR)
4652 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4653 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4654 		if (rc != ERR)
4655 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4656 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4657 		if (rc != ERR)
4658 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4659 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4660 		if (rc != ERR)
4661 			rc = init_pair(GOT_DIFF_LINE_DATE,
4662 			    get_color_value("TOG_COLOR_DATE"), -1);
4663 		if (rc == ERR) {
4664 			err = got_error(GOT_ERR_RANGE);
4665 			goto done;
4666 		}
4667 	}
4668 
4669 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4670 	    view_is_splitscreen(view))
4671 		show_log_view(parent_view); /* draw border */
4672 	diff_view_indicate_progress(view);
4673 
4674 	err = create_diff(s);
4675 
4676 	view->show = show_diff_view;
4677 	view->input = input_diff_view;
4678 	view->reset = reset_diff_view;
4679 	view->close = close_diff_view;
4680 	view->search_start = search_start_diff_view;
4681 	view->search_next = search_next_diff_view;
4682 done:
4683 	if (err)
4684 		close_diff_view(view);
4685 	return err;
4686 }
4687 
4688 static const struct got_error *
4689 show_diff_view(struct tog_view *view)
4690 {
4691 	const struct got_error *err;
4692 	struct tog_diff_view_state *s = &view->state.diff;
4693 	char *id_str1 = NULL, *id_str2, *header;
4694 	const char *label1, *label2;
4695 
4696 	if (s->id1) {
4697 		err = got_object_id_str(&id_str1, s->id1);
4698 		if (err)
4699 			return err;
4700 		label1 = s->label1 ? s->label1 : id_str1;
4701 	} else
4702 		label1 = "/dev/null";
4703 
4704 	err = got_object_id_str(&id_str2, s->id2);
4705 	if (err)
4706 		return err;
4707 	label2 = s->label2 ? s->label2 : id_str2;
4708 
4709 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4710 		err = got_error_from_errno("asprintf");
4711 		free(id_str1);
4712 		free(id_str2);
4713 		return err;
4714 	}
4715 	free(id_str1);
4716 	free(id_str2);
4717 
4718 	err = draw_file(view, header);
4719 	free(header);
4720 	return err;
4721 }
4722 
4723 static const struct got_error *
4724 set_selected_commit(struct tog_diff_view_state *s,
4725     struct commit_queue_entry *entry)
4726 {
4727 	const struct got_error *err;
4728 	const struct got_object_id_queue *parent_ids;
4729 	struct got_commit_object *selected_commit;
4730 	struct got_object_qid *pid;
4731 
4732 	free(s->id2);
4733 	s->id2 = got_object_id_dup(entry->id);
4734 	if (s->id2 == NULL)
4735 		return got_error_from_errno("got_object_id_dup");
4736 
4737 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4738 	if (err)
4739 		return err;
4740 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4741 	free(s->id1);
4742 	pid = STAILQ_FIRST(parent_ids);
4743 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4744 	got_object_commit_close(selected_commit);
4745 	return NULL;
4746 }
4747 
4748 static const struct got_error *
4749 reset_diff_view(struct tog_view *view)
4750 {
4751 	struct tog_diff_view_state *s = &view->state.diff;
4752 
4753 	view->count = 0;
4754 	wclear(view->window);
4755 	s->first_displayed_line = 1;
4756 	s->last_displayed_line = view->nlines;
4757 	s->matched_line = 0;
4758 	diff_view_indicate_progress(view);
4759 	return create_diff(s);
4760 }
4761 
4762 static void
4763 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4764 {
4765 	int start, i;
4766 
4767 	i = start = s->first_displayed_line - 1;
4768 
4769 	while (s->lines[i].type != type) {
4770 		if (i == 0)
4771 			i = s->nlines - 1;
4772 		if (--i == start)
4773 			return; /* do nothing, requested type not in file */
4774 	}
4775 
4776 	s->selected_line = 1;
4777 	s->first_displayed_line = i;
4778 }
4779 
4780 static void
4781 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4782 {
4783 	int start, i;
4784 
4785 	i = start = s->first_displayed_line + 1;
4786 
4787 	while (s->lines[i].type != type) {
4788 		if (i == s->nlines - 1)
4789 			i = 0;
4790 		if (++i == start)
4791 			return; /* do nothing, requested type not in file */
4792 	}
4793 
4794 	s->selected_line = 1;
4795 	s->first_displayed_line = i;
4796 }
4797 
4798 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4799     int, int, int);
4800 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4801     int, int);
4802 
4803 static const struct got_error *
4804 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4805 {
4806 	const struct got_error *err = NULL;
4807 	struct tog_diff_view_state *s = &view->state.diff;
4808 	struct tog_log_view_state *ls;
4809 	struct commit_queue_entry *old_selected_entry;
4810 	char *line = NULL;
4811 	size_t linesize = 0;
4812 	ssize_t linelen;
4813 	int i, nscroll = view->nlines - 1, up = 0;
4814 
4815 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
4816 
4817 	switch (ch) {
4818 	case '0':
4819 		view->x = 0;
4820 		break;
4821 	case '$':
4822 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4823 		view->count = 0;
4824 		break;
4825 	case KEY_RIGHT:
4826 	case 'l':
4827 		if (view->x + view->ncols / 3 < view->maxx)
4828 			view->x += 2;  /* move two columns right */
4829 		else
4830 			view->count = 0;
4831 		break;
4832 	case KEY_LEFT:
4833 	case 'h':
4834 		view->x -= MIN(view->x, 2);  /* move two columns back */
4835 		if (view->x <= 0)
4836 			view->count = 0;
4837 		break;
4838 	case 'a':
4839 	case 'w':
4840 		if (ch == 'a')
4841 			s->force_text_diff = !s->force_text_diff;
4842 		if (ch == 'w')
4843 			s->ignore_whitespace = !s->ignore_whitespace;
4844 		err = reset_diff_view(view);
4845 		break;
4846 	case 'g':
4847 	case KEY_HOME:
4848 		s->first_displayed_line = 1;
4849 		view->count = 0;
4850 		break;
4851 	case 'G':
4852 	case KEY_END:
4853 		view->count = 0;
4854 		if (s->eof)
4855 			break;
4856 
4857 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4858 		s->eof = 1;
4859 		break;
4860 	case 'k':
4861 	case KEY_UP:
4862 	case CTRL('p'):
4863 		if (s->first_displayed_line > 1)
4864 			s->first_displayed_line--;
4865 		else
4866 			view->count = 0;
4867 		break;
4868 	case CTRL('u'):
4869 	case 'u':
4870 		nscroll /= 2;
4871 		/* FALL THROUGH */
4872 	case KEY_PPAGE:
4873 	case CTRL('b'):
4874 	case 'b':
4875 		if (s->first_displayed_line == 1) {
4876 			view->count = 0;
4877 			break;
4878 		}
4879 		i = 0;
4880 		while (i++ < nscroll && s->first_displayed_line > 1)
4881 			s->first_displayed_line--;
4882 		break;
4883 	case 'j':
4884 	case KEY_DOWN:
4885 	case CTRL('n'):
4886 		if (!s->eof)
4887 			s->first_displayed_line++;
4888 		else
4889 			view->count = 0;
4890 		break;
4891 	case CTRL('d'):
4892 	case 'd':
4893 		nscroll /= 2;
4894 		/* FALL THROUGH */
4895 	case KEY_NPAGE:
4896 	case CTRL('f'):
4897 	case 'f':
4898 	case ' ':
4899 		if (s->eof) {
4900 			view->count = 0;
4901 			break;
4902 		}
4903 		i = 0;
4904 		while (!s->eof && i++ < nscroll) {
4905 			linelen = getline(&line, &linesize, s->f);
4906 			s->first_displayed_line++;
4907 			if (linelen == -1) {
4908 				if (feof(s->f)) {
4909 					s->eof = 1;
4910 				} else
4911 					err = got_ferror(s->f, GOT_ERR_IO);
4912 				break;
4913 			}
4914 		}
4915 		free(line);
4916 		break;
4917 	case '(':
4918 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
4919 		break;
4920 	case ')':
4921 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
4922 		break;
4923 	case '{':
4924 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
4925 		break;
4926 	case '}':
4927 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
4928 		break;
4929 	case '[':
4930 		if (s->diff_context > 0) {
4931 			s->diff_context--;
4932 			s->matched_line = 0;
4933 			diff_view_indicate_progress(view);
4934 			err = create_diff(s);
4935 			if (s->first_displayed_line + view->nlines - 1 >
4936 			    s->nlines) {
4937 				s->first_displayed_line = 1;
4938 				s->last_displayed_line = view->nlines;
4939 			}
4940 		} else
4941 			view->count = 0;
4942 		break;
4943 	case ']':
4944 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4945 			s->diff_context++;
4946 			s->matched_line = 0;
4947 			diff_view_indicate_progress(view);
4948 			err = create_diff(s);
4949 		} else
4950 			view->count = 0;
4951 		break;
4952 	case '<':
4953 	case ',':
4954 	case 'K':
4955 		up = 1;
4956 		/* FALL THROUGH */
4957 	case '>':
4958 	case '.':
4959 	case 'J':
4960 		if (s->parent_view == NULL) {
4961 			view->count = 0;
4962 			break;
4963 		}
4964 		s->parent_view->count = view->count;
4965 
4966 		if (s->parent_view->type == TOG_VIEW_LOG) {
4967 			ls = &s->parent_view->state.log;
4968 			old_selected_entry = ls->selected_entry;
4969 
4970 			err = input_log_view(NULL, s->parent_view,
4971 			    up ? KEY_UP : KEY_DOWN);
4972 			if (err)
4973 				break;
4974 			view->count = s->parent_view->count;
4975 
4976 			if (old_selected_entry == ls->selected_entry)
4977 				break;
4978 
4979 			err = set_selected_commit(s, ls->selected_entry);
4980 			if (err)
4981 				break;
4982 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4983 			struct tog_blame_view_state *bs;
4984 			struct got_object_id *id, *prev_id;
4985 
4986 			bs = &s->parent_view->state.blame;
4987 			prev_id = get_annotation_for_line(bs->blame.lines,
4988 			    bs->blame.nlines, bs->last_diffed_line);
4989 
4990 			err = input_blame_view(&view, s->parent_view,
4991 			    up ? KEY_UP : KEY_DOWN);
4992 			if (err)
4993 				break;
4994 			view->count = s->parent_view->count;
4995 
4996 			if (prev_id == NULL)
4997 				break;
4998 			id = get_selected_commit_id(bs->blame.lines,
4999 			    bs->blame.nlines, bs->first_displayed_line,
5000 			    bs->selected_line);
5001 			if (id == NULL)
5002 				break;
5003 
5004 			if (!got_object_id_cmp(prev_id, id))
5005 				break;
5006 
5007 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5008 			if (err)
5009 				break;
5010 		}
5011 		s->first_displayed_line = 1;
5012 		s->last_displayed_line = view->nlines;
5013 		s->matched_line = 0;
5014 		view->x = 0;
5015 
5016 		diff_view_indicate_progress(view);
5017 		err = create_diff(s);
5018 		break;
5019 	default:
5020 		view->count = 0;
5021 		break;
5022 	}
5023 
5024 	return err;
5025 }
5026 
5027 static const struct got_error *
5028 cmd_diff(int argc, char *argv[])
5029 {
5030 	const struct got_error *error = NULL;
5031 	struct got_repository *repo = NULL;
5032 	struct got_worktree *worktree = NULL;
5033 	struct got_object_id *id1 = NULL, *id2 = NULL;
5034 	char *repo_path = NULL, *cwd = NULL;
5035 	char *id_str1 = NULL, *id_str2 = NULL;
5036 	char *label1 = NULL, *label2 = NULL;
5037 	int diff_context = 3, ignore_whitespace = 0;
5038 	int ch, force_text_diff = 0;
5039 	const char *errstr;
5040 	struct tog_view *view;
5041 	int *pack_fds = NULL;
5042 
5043 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5044 		switch (ch) {
5045 		case 'a':
5046 			force_text_diff = 1;
5047 			break;
5048 		case 'C':
5049 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5050 			    &errstr);
5051 			if (errstr != NULL)
5052 				errx(1, "number of context lines is %s: %s",
5053 				    errstr, errstr);
5054 			break;
5055 		case 'r':
5056 			repo_path = realpath(optarg, NULL);
5057 			if (repo_path == NULL)
5058 				return got_error_from_errno2("realpath",
5059 				    optarg);
5060 			got_path_strip_trailing_slashes(repo_path);
5061 			break;
5062 		case 'w':
5063 			ignore_whitespace = 1;
5064 			break;
5065 		default:
5066 			usage_diff();
5067 			/* NOTREACHED */
5068 		}
5069 	}
5070 
5071 	argc -= optind;
5072 	argv += optind;
5073 
5074 	if (argc == 0) {
5075 		usage_diff(); /* TODO show local worktree changes */
5076 	} else if (argc == 2) {
5077 		id_str1 = argv[0];
5078 		id_str2 = argv[1];
5079 	} else
5080 		usage_diff();
5081 
5082 	error = got_repo_pack_fds_open(&pack_fds);
5083 	if (error)
5084 		goto done;
5085 
5086 	if (repo_path == NULL) {
5087 		cwd = getcwd(NULL, 0);
5088 		if (cwd == NULL)
5089 			return got_error_from_errno("getcwd");
5090 		error = got_worktree_open(&worktree, cwd);
5091 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5092 			goto done;
5093 		if (worktree)
5094 			repo_path =
5095 			    strdup(got_worktree_get_repo_path(worktree));
5096 		else
5097 			repo_path = strdup(cwd);
5098 		if (repo_path == NULL) {
5099 			error = got_error_from_errno("strdup");
5100 			goto done;
5101 		}
5102 	}
5103 
5104 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5105 	if (error)
5106 		goto done;
5107 
5108 	init_curses();
5109 
5110 	error = apply_unveil(got_repo_get_path(repo), NULL);
5111 	if (error)
5112 		goto done;
5113 
5114 	error = tog_load_refs(repo, 0);
5115 	if (error)
5116 		goto done;
5117 
5118 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5119 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5120 	if (error)
5121 		goto done;
5122 
5123 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5124 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5125 	if (error)
5126 		goto done;
5127 
5128 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5129 	if (view == NULL) {
5130 		error = got_error_from_errno("view_open");
5131 		goto done;
5132 	}
5133 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5134 	    ignore_whitespace, force_text_diff, NULL,  repo);
5135 	if (error)
5136 		goto done;
5137 	error = view_loop(view);
5138 done:
5139 	free(label1);
5140 	free(label2);
5141 	free(repo_path);
5142 	free(cwd);
5143 	if (repo) {
5144 		const struct got_error *close_err = got_repo_close(repo);
5145 		if (error == NULL)
5146 			error = close_err;
5147 	}
5148 	if (worktree)
5149 		got_worktree_close(worktree);
5150 	if (pack_fds) {
5151 		const struct got_error *pack_err =
5152 		    got_repo_pack_fds_close(pack_fds);
5153 		if (error == NULL)
5154 			error = pack_err;
5155 	}
5156 	tog_free_refs();
5157 	return error;
5158 }
5159 
5160 __dead static void
5161 usage_blame(void)
5162 {
5163 	endwin();
5164 	fprintf(stderr,
5165 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5166 	    getprogname());
5167 	exit(1);
5168 }
5169 
5170 struct tog_blame_line {
5171 	int annotated;
5172 	struct got_object_id *id;
5173 };
5174 
5175 static const struct got_error *
5176 draw_blame(struct tog_view *view)
5177 {
5178 	struct tog_blame_view_state *s = &view->state.blame;
5179 	struct tog_blame *blame = &s->blame;
5180 	regmatch_t *regmatch = &view->regmatch;
5181 	const struct got_error *err;
5182 	int lineno = 0, nprinted = 0;
5183 	char *line = NULL;
5184 	size_t linesize = 0;
5185 	ssize_t linelen;
5186 	wchar_t *wline;
5187 	int width;
5188 	struct tog_blame_line *blame_line;
5189 	struct got_object_id *prev_id = NULL;
5190 	char *id_str;
5191 	struct tog_color *tc;
5192 
5193 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5194 	if (err)
5195 		return err;
5196 
5197 	rewind(blame->f);
5198 	werase(view->window);
5199 
5200 	if (asprintf(&line, "commit %s", id_str) == -1) {
5201 		err = got_error_from_errno("asprintf");
5202 		free(id_str);
5203 		return err;
5204 	}
5205 
5206 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5207 	free(line);
5208 	line = NULL;
5209 	if (err)
5210 		return err;
5211 	if (view_needs_focus_indication(view))
5212 		wstandout(view->window);
5213 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5214 	if (tc)
5215 		wattr_on(view->window,
5216 		    COLOR_PAIR(tc->colorpair), NULL);
5217 	waddwstr(view->window, wline);
5218 	if (tc)
5219 		wattr_off(view->window,
5220 		    COLOR_PAIR(tc->colorpair), NULL);
5221 	if (view_needs_focus_indication(view))
5222 		wstandend(view->window);
5223 	free(wline);
5224 	wline = NULL;
5225 	if (width < view->ncols - 1)
5226 		waddch(view->window, '\n');
5227 
5228 	if (view->gline > blame->nlines)
5229 		view->gline = blame->nlines;
5230 
5231 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5232 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5233 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5234 		free(id_str);
5235 		return got_error_from_errno("asprintf");
5236 	}
5237 	free(id_str);
5238 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5239 	free(line);
5240 	line = NULL;
5241 	if (err)
5242 		return err;
5243 	waddwstr(view->window, wline);
5244 	free(wline);
5245 	wline = NULL;
5246 	if (width < view->ncols - 1)
5247 		waddch(view->window, '\n');
5248 
5249 	s->eof = 0;
5250 	view->maxx = 0;
5251 	while (nprinted < view->nlines - 2) {
5252 		linelen = getline(&line, &linesize, blame->f);
5253 		if (linelen == -1) {
5254 			if (feof(blame->f)) {
5255 				s->eof = 1;
5256 				break;
5257 			}
5258 			free(line);
5259 			return got_ferror(blame->f, GOT_ERR_IO);
5260 		}
5261 		if (++lineno < s->first_displayed_line)
5262 			continue;
5263 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5264 			continue;
5265 
5266 		/* Set view->maxx based on full line length. */
5267 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5268 		if (err) {
5269 			free(line);
5270 			return err;
5271 		}
5272 		free(wline);
5273 		wline = NULL;
5274 		view->maxx = MAX(view->maxx, width);
5275 
5276 		if (nprinted == s->selected_line - 1)
5277 			wstandout(view->window);
5278 
5279 		if (blame->nlines > 0) {
5280 			blame_line = &blame->lines[lineno - 1];
5281 			if (blame_line->annotated && prev_id &&
5282 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5283 			    !(nprinted == s->selected_line - 1)) {
5284 				waddstr(view->window, "        ");
5285 			} else if (blame_line->annotated) {
5286 				char *id_str;
5287 				err = got_object_id_str(&id_str,
5288 				    blame_line->id);
5289 				if (err) {
5290 					free(line);
5291 					return err;
5292 				}
5293 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5294 				if (tc)
5295 					wattr_on(view->window,
5296 					    COLOR_PAIR(tc->colorpair), NULL);
5297 				wprintw(view->window, "%.8s", id_str);
5298 				if (tc)
5299 					wattr_off(view->window,
5300 					    COLOR_PAIR(tc->colorpair), NULL);
5301 				free(id_str);
5302 				prev_id = blame_line->id;
5303 			} else {
5304 				waddstr(view->window, "........");
5305 				prev_id = NULL;
5306 			}
5307 		} else {
5308 			waddstr(view->window, "........");
5309 			prev_id = NULL;
5310 		}
5311 
5312 		if (nprinted == s->selected_line - 1)
5313 			wstandend(view->window);
5314 		waddstr(view->window, " ");
5315 
5316 		if (view->ncols <= 9) {
5317 			width = 9;
5318 		} else if (s->first_displayed_line + nprinted ==
5319 		    s->matched_line &&
5320 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5321 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5322 			    view->window, view->x, regmatch);
5323 			if (err) {
5324 				free(line);
5325 				return err;
5326 			}
5327 			width += 9;
5328 		} else {
5329 			int skip;
5330 			err = format_line(&wline, &width, &skip, line,
5331 			    view->x, view->ncols - 9, 9, 1);
5332 			if (err) {
5333 				free(line);
5334 				return err;
5335 			}
5336 			waddwstr(view->window, &wline[skip]);
5337 			width += 9;
5338 			free(wline);
5339 			wline = NULL;
5340 		}
5341 
5342 		if (width <= view->ncols - 1)
5343 			waddch(view->window, '\n');
5344 		if (++nprinted == 1)
5345 			s->first_displayed_line = lineno;
5346 	}
5347 	free(line);
5348 	s->last_displayed_line = lineno;
5349 
5350 	view_border(view);
5351 
5352 	return NULL;
5353 }
5354 
5355 static const struct got_error *
5356 blame_cb(void *arg, int nlines, int lineno,
5357     struct got_commit_object *commit, struct got_object_id *id)
5358 {
5359 	const struct got_error *err = NULL;
5360 	struct tog_blame_cb_args *a = arg;
5361 	struct tog_blame_line *line;
5362 	int errcode;
5363 
5364 	if (nlines != a->nlines ||
5365 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5366 		return got_error(GOT_ERR_RANGE);
5367 
5368 	errcode = pthread_mutex_lock(&tog_mutex);
5369 	if (errcode)
5370 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5371 
5372 	if (*a->quit) {	/* user has quit the blame view */
5373 		err = got_error(GOT_ERR_ITER_COMPLETED);
5374 		goto done;
5375 	}
5376 
5377 	if (lineno == -1)
5378 		goto done; /* no change in this commit */
5379 
5380 	line = &a->lines[lineno - 1];
5381 	if (line->annotated)
5382 		goto done;
5383 
5384 	line->id = got_object_id_dup(id);
5385 	if (line->id == NULL) {
5386 		err = got_error_from_errno("got_object_id_dup");
5387 		goto done;
5388 	}
5389 	line->annotated = 1;
5390 done:
5391 	errcode = pthread_mutex_unlock(&tog_mutex);
5392 	if (errcode)
5393 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5394 	return err;
5395 }
5396 
5397 static void *
5398 blame_thread(void *arg)
5399 {
5400 	const struct got_error *err, *close_err;
5401 	struct tog_blame_thread_args *ta = arg;
5402 	struct tog_blame_cb_args *a = ta->cb_args;
5403 	int errcode, fd1 = -1, fd2 = -1;
5404 	FILE *f1 = NULL, *f2 = NULL;
5405 
5406 	fd1 = got_opentempfd();
5407 	if (fd1 == -1)
5408 		return (void *)got_error_from_errno("got_opentempfd");
5409 
5410 	fd2 = got_opentempfd();
5411 	if (fd2 == -1) {
5412 		err = got_error_from_errno("got_opentempfd");
5413 		goto done;
5414 	}
5415 
5416 	f1 = got_opentemp();
5417 	if (f1 == NULL) {
5418 		err = (void *)got_error_from_errno("got_opentemp");
5419 		goto done;
5420 	}
5421 	f2 = got_opentemp();
5422 	if (f2 == NULL) {
5423 		err = (void *)got_error_from_errno("got_opentemp");
5424 		goto done;
5425 	}
5426 
5427 	err = block_signals_used_by_main_thread();
5428 	if (err)
5429 		goto done;
5430 
5431 	err = got_blame(ta->path, a->commit_id, ta->repo,
5432 	    tog_diff_algo, blame_cb, ta->cb_args,
5433 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5434 	if (err && err->code == GOT_ERR_CANCELLED)
5435 		err = NULL;
5436 
5437 	errcode = pthread_mutex_lock(&tog_mutex);
5438 	if (errcode) {
5439 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5440 		goto done;
5441 	}
5442 
5443 	close_err = got_repo_close(ta->repo);
5444 	if (err == NULL)
5445 		err = close_err;
5446 	ta->repo = NULL;
5447 	*ta->complete = 1;
5448 
5449 	errcode = pthread_mutex_unlock(&tog_mutex);
5450 	if (errcode && err == NULL)
5451 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5452 
5453 done:
5454 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5455 		err = got_error_from_errno("close");
5456 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5457 		err = got_error_from_errno("close");
5458 	if (f1 && fclose(f1) == EOF && err == NULL)
5459 		err = got_error_from_errno("fclose");
5460 	if (f2 && fclose(f2) == EOF && err == NULL)
5461 		err = got_error_from_errno("fclose");
5462 
5463 	return (void *)err;
5464 }
5465 
5466 static struct got_object_id *
5467 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5468     int first_displayed_line, int selected_line)
5469 {
5470 	struct tog_blame_line *line;
5471 
5472 	if (nlines <= 0)
5473 		return NULL;
5474 
5475 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5476 	if (!line->annotated)
5477 		return NULL;
5478 
5479 	return line->id;
5480 }
5481 
5482 static struct got_object_id *
5483 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5484     int lineno)
5485 {
5486 	struct tog_blame_line *line;
5487 
5488 	if (nlines <= 0 || lineno >= nlines)
5489 		return NULL;
5490 
5491 	line = &lines[lineno - 1];
5492 	if (!line->annotated)
5493 		return NULL;
5494 
5495 	return line->id;
5496 }
5497 
5498 static const struct got_error *
5499 stop_blame(struct tog_blame *blame)
5500 {
5501 	const struct got_error *err = NULL;
5502 	int i;
5503 
5504 	if (blame->thread) {
5505 		int errcode;
5506 		errcode = pthread_mutex_unlock(&tog_mutex);
5507 		if (errcode)
5508 			return got_error_set_errno(errcode,
5509 			    "pthread_mutex_unlock");
5510 		errcode = pthread_join(blame->thread, (void **)&err);
5511 		if (errcode)
5512 			return got_error_set_errno(errcode, "pthread_join");
5513 		errcode = pthread_mutex_lock(&tog_mutex);
5514 		if (errcode)
5515 			return got_error_set_errno(errcode,
5516 			    "pthread_mutex_lock");
5517 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5518 			err = NULL;
5519 		blame->thread = 0; //NULL;
5520 	}
5521 	if (blame->thread_args.repo) {
5522 		const struct got_error *close_err;
5523 		close_err = got_repo_close(blame->thread_args.repo);
5524 		if (err == NULL)
5525 			err = close_err;
5526 		blame->thread_args.repo = NULL;
5527 	}
5528 	if (blame->f) {
5529 		if (fclose(blame->f) == EOF && err == NULL)
5530 			err = got_error_from_errno("fclose");
5531 		blame->f = NULL;
5532 	}
5533 	if (blame->lines) {
5534 		for (i = 0; i < blame->nlines; i++)
5535 			free(blame->lines[i].id);
5536 		free(blame->lines);
5537 		blame->lines = NULL;
5538 	}
5539 	free(blame->cb_args.commit_id);
5540 	blame->cb_args.commit_id = NULL;
5541 	if (blame->pack_fds) {
5542 		const struct got_error *pack_err =
5543 		    got_repo_pack_fds_close(blame->pack_fds);
5544 		if (err == NULL)
5545 			err = pack_err;
5546 		blame->pack_fds = NULL;
5547 	}
5548 	return err;
5549 }
5550 
5551 static const struct got_error *
5552 cancel_blame_view(void *arg)
5553 {
5554 	const struct got_error *err = NULL;
5555 	int *done = arg;
5556 	int errcode;
5557 
5558 	errcode = pthread_mutex_lock(&tog_mutex);
5559 	if (errcode)
5560 		return got_error_set_errno(errcode,
5561 		    "pthread_mutex_unlock");
5562 
5563 	if (*done)
5564 		err = got_error(GOT_ERR_CANCELLED);
5565 
5566 	errcode = pthread_mutex_unlock(&tog_mutex);
5567 	if (errcode)
5568 		return got_error_set_errno(errcode,
5569 		    "pthread_mutex_lock");
5570 
5571 	return err;
5572 }
5573 
5574 static const struct got_error *
5575 run_blame(struct tog_view *view)
5576 {
5577 	struct tog_blame_view_state *s = &view->state.blame;
5578 	struct tog_blame *blame = &s->blame;
5579 	const struct got_error *err = NULL;
5580 	struct got_commit_object *commit = NULL;
5581 	struct got_blob_object *blob = NULL;
5582 	struct got_repository *thread_repo = NULL;
5583 	struct got_object_id *obj_id = NULL;
5584 	int obj_type, fd = -1;
5585 	int *pack_fds = NULL;
5586 
5587 	err = got_object_open_as_commit(&commit, s->repo,
5588 	    &s->blamed_commit->id);
5589 	if (err)
5590 		return err;
5591 
5592 	fd = got_opentempfd();
5593 	if (fd == -1) {
5594 		err = got_error_from_errno("got_opentempfd");
5595 		goto done;
5596 	}
5597 
5598 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5599 	if (err)
5600 		goto done;
5601 
5602 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5603 	if (err)
5604 		goto done;
5605 
5606 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5607 		err = got_error(GOT_ERR_OBJ_TYPE);
5608 		goto done;
5609 	}
5610 
5611 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5612 	if (err)
5613 		goto done;
5614 	blame->f = got_opentemp();
5615 	if (blame->f == NULL) {
5616 		err = got_error_from_errno("got_opentemp");
5617 		goto done;
5618 	}
5619 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5620 	    &blame->line_offsets, blame->f, blob);
5621 	if (err)
5622 		goto done;
5623 	if (blame->nlines == 0) {
5624 		s->blame_complete = 1;
5625 		goto done;
5626 	}
5627 
5628 	/* Don't include \n at EOF in the blame line count. */
5629 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5630 		blame->nlines--;
5631 
5632 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5633 	if (blame->lines == NULL) {
5634 		err = got_error_from_errno("calloc");
5635 		goto done;
5636 	}
5637 
5638 	err = got_repo_pack_fds_open(&pack_fds);
5639 	if (err)
5640 		goto done;
5641 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5642 	    pack_fds);
5643 	if (err)
5644 		goto done;
5645 
5646 	blame->pack_fds = pack_fds;
5647 	blame->cb_args.view = view;
5648 	blame->cb_args.lines = blame->lines;
5649 	blame->cb_args.nlines = blame->nlines;
5650 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5651 	if (blame->cb_args.commit_id == NULL) {
5652 		err = got_error_from_errno("got_object_id_dup");
5653 		goto done;
5654 	}
5655 	blame->cb_args.quit = &s->done;
5656 
5657 	blame->thread_args.path = s->path;
5658 	blame->thread_args.repo = thread_repo;
5659 	blame->thread_args.cb_args = &blame->cb_args;
5660 	blame->thread_args.complete = &s->blame_complete;
5661 	blame->thread_args.cancel_cb = cancel_blame_view;
5662 	blame->thread_args.cancel_arg = &s->done;
5663 	s->blame_complete = 0;
5664 
5665 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5666 		s->first_displayed_line = 1;
5667 		s->last_displayed_line = view->nlines;
5668 		s->selected_line = 1;
5669 	}
5670 	s->matched_line = 0;
5671 
5672 done:
5673 	if (commit)
5674 		got_object_commit_close(commit);
5675 	if (fd != -1 && close(fd) == -1 && err == NULL)
5676 		err = got_error_from_errno("close");
5677 	if (blob)
5678 		got_object_blob_close(blob);
5679 	free(obj_id);
5680 	if (err)
5681 		stop_blame(blame);
5682 	return err;
5683 }
5684 
5685 static const struct got_error *
5686 open_blame_view(struct tog_view *view, char *path,
5687     struct got_object_id *commit_id, struct got_repository *repo)
5688 {
5689 	const struct got_error *err = NULL;
5690 	struct tog_blame_view_state *s = &view->state.blame;
5691 
5692 	STAILQ_INIT(&s->blamed_commits);
5693 
5694 	s->path = strdup(path);
5695 	if (s->path == NULL)
5696 		return got_error_from_errno("strdup");
5697 
5698 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5699 	if (err) {
5700 		free(s->path);
5701 		return err;
5702 	}
5703 
5704 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5705 	s->first_displayed_line = 1;
5706 	s->last_displayed_line = view->nlines;
5707 	s->selected_line = 1;
5708 	s->blame_complete = 0;
5709 	s->repo = repo;
5710 	s->commit_id = commit_id;
5711 	memset(&s->blame, 0, sizeof(s->blame));
5712 
5713 	STAILQ_INIT(&s->colors);
5714 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5715 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5716 		    get_color_value("TOG_COLOR_COMMIT"));
5717 		if (err)
5718 			return err;
5719 	}
5720 
5721 	view->show = show_blame_view;
5722 	view->input = input_blame_view;
5723 	view->reset = reset_blame_view;
5724 	view->close = close_blame_view;
5725 	view->search_start = search_start_blame_view;
5726 	view->search_next = search_next_blame_view;
5727 
5728 	return run_blame(view);
5729 }
5730 
5731 static const struct got_error *
5732 close_blame_view(struct tog_view *view)
5733 {
5734 	const struct got_error *err = NULL;
5735 	struct tog_blame_view_state *s = &view->state.blame;
5736 
5737 	if (s->blame.thread)
5738 		err = stop_blame(&s->blame);
5739 
5740 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5741 		struct got_object_qid *blamed_commit;
5742 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5743 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5744 		got_object_qid_free(blamed_commit);
5745 	}
5746 
5747 	free(s->path);
5748 	free_colors(&s->colors);
5749 	return err;
5750 }
5751 
5752 static const struct got_error *
5753 search_start_blame_view(struct tog_view *view)
5754 {
5755 	struct tog_blame_view_state *s = &view->state.blame;
5756 
5757 	s->matched_line = 0;
5758 	return NULL;
5759 }
5760 
5761 static const struct got_error *
5762 search_next_blame_view(struct tog_view *view)
5763 {
5764 	struct tog_blame_view_state *s = &view->state.blame;
5765 	const struct got_error *err = NULL;
5766 	int lineno;
5767 	char *line = NULL;
5768 	size_t linesize = 0;
5769 	ssize_t linelen;
5770 
5771 	if (!view->searching) {
5772 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5773 		return NULL;
5774 	}
5775 
5776 	if (s->matched_line) {
5777 		if (view->searching == TOG_SEARCH_FORWARD)
5778 			lineno = s->matched_line + 1;
5779 		else
5780 			lineno = s->matched_line - 1;
5781 	} else
5782 		lineno = s->first_displayed_line - 1 + s->selected_line;
5783 
5784 	while (1) {
5785 		off_t offset;
5786 
5787 		if (lineno <= 0 || lineno > s->blame.nlines) {
5788 			if (s->matched_line == 0) {
5789 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5790 				break;
5791 			}
5792 
5793 			if (view->searching == TOG_SEARCH_FORWARD)
5794 				lineno = 1;
5795 			else
5796 				lineno = s->blame.nlines;
5797 		}
5798 
5799 		offset = s->blame.line_offsets[lineno - 1];
5800 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5801 			free(line);
5802 			return got_error_from_errno("fseeko");
5803 		}
5804 		linelen = getline(&line, &linesize, s->blame.f);
5805 		if (linelen != -1) {
5806 			char *exstr;
5807 			err = expand_tab(&exstr, line);
5808 			if (err)
5809 				break;
5810 			if (match_line(exstr, &view->regex, 1,
5811 			    &view->regmatch)) {
5812 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5813 				s->matched_line = lineno;
5814 				free(exstr);
5815 				break;
5816 			}
5817 			free(exstr);
5818 		}
5819 		if (view->searching == TOG_SEARCH_FORWARD)
5820 			lineno++;
5821 		else
5822 			lineno--;
5823 	}
5824 	free(line);
5825 
5826 	if (s->matched_line) {
5827 		s->first_displayed_line = s->matched_line;
5828 		s->selected_line = 1;
5829 	}
5830 
5831 	return err;
5832 }
5833 
5834 static const struct got_error *
5835 show_blame_view(struct tog_view *view)
5836 {
5837 	const struct got_error *err = NULL;
5838 	struct tog_blame_view_state *s = &view->state.blame;
5839 	int errcode;
5840 
5841 	if (s->blame.thread == 0 && !s->blame_complete) {
5842 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5843 		    &s->blame.thread_args);
5844 		if (errcode)
5845 			return got_error_set_errno(errcode, "pthread_create");
5846 
5847 		halfdelay(1); /* fast refresh while annotating  */
5848 	}
5849 
5850 	if (s->blame_complete)
5851 		halfdelay(10); /* disable fast refresh */
5852 
5853 	err = draw_blame(view);
5854 
5855 	view_border(view);
5856 	return err;
5857 }
5858 
5859 static const struct got_error *
5860 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5861     struct got_repository *repo, struct got_object_id *id)
5862 {
5863 	struct tog_view		*log_view;
5864 	const struct got_error	*err = NULL;
5865 
5866 	*new_view = NULL;
5867 
5868 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5869 	if (log_view == NULL)
5870 		return got_error_from_errno("view_open");
5871 
5872 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5873 	if (err)
5874 		view_close(log_view);
5875 	else
5876 		*new_view = log_view;
5877 
5878 	return err;
5879 }
5880 
5881 static const struct got_error *
5882 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5883 {
5884 	const struct got_error *err = NULL, *thread_err = NULL;
5885 	struct tog_view *diff_view;
5886 	struct tog_blame_view_state *s = &view->state.blame;
5887 	int eos, nscroll, begin_y = 0, begin_x = 0;
5888 
5889 	eos = nscroll = view->nlines - 2;
5890 	if (view_is_hsplit_top(view))
5891 		--eos;  /* border */
5892 
5893 	switch (ch) {
5894 	case '0':
5895 		view->x = 0;
5896 		break;
5897 	case '$':
5898 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5899 		view->count = 0;
5900 		break;
5901 	case KEY_RIGHT:
5902 	case 'l':
5903 		if (view->x + view->ncols / 3 < view->maxx)
5904 			view->x += 2;  /* move two columns right */
5905 		else
5906 			view->count = 0;
5907 		break;
5908 	case KEY_LEFT:
5909 	case 'h':
5910 		view->x -= MIN(view->x, 2);  /* move two columns back */
5911 		if (view->x <= 0)
5912 			view->count = 0;
5913 		break;
5914 	case 'q':
5915 		s->done = 1;
5916 		break;
5917 	case 'g':
5918 	case KEY_HOME:
5919 		s->selected_line = 1;
5920 		s->first_displayed_line = 1;
5921 		view->count = 0;
5922 		break;
5923 	case 'G':
5924 	case KEY_END:
5925 		if (s->blame.nlines < eos) {
5926 			s->selected_line = s->blame.nlines;
5927 			s->first_displayed_line = 1;
5928 		} else {
5929 			s->selected_line = eos;
5930 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5931 		}
5932 		view->count = 0;
5933 		break;
5934 	case 'k':
5935 	case KEY_UP:
5936 	case CTRL('p'):
5937 		if (s->selected_line > 1)
5938 			s->selected_line--;
5939 		else if (s->selected_line == 1 &&
5940 		    s->first_displayed_line > 1)
5941 			s->first_displayed_line--;
5942 		else
5943 			view->count = 0;
5944 		break;
5945 	case CTRL('u'):
5946 	case 'u':
5947 		nscroll /= 2;
5948 		/* FALL THROUGH */
5949 	case KEY_PPAGE:
5950 	case CTRL('b'):
5951 	case 'b':
5952 		if (s->first_displayed_line == 1) {
5953 			if (view->count > 1)
5954 				nscroll += nscroll;
5955 			s->selected_line = MAX(1, s->selected_line - nscroll);
5956 			view->count = 0;
5957 			break;
5958 		}
5959 		if (s->first_displayed_line > nscroll)
5960 			s->first_displayed_line -= nscroll;
5961 		else
5962 			s->first_displayed_line = 1;
5963 		break;
5964 	case 'j':
5965 	case KEY_DOWN:
5966 	case CTRL('n'):
5967 		if (s->selected_line < eos && s->first_displayed_line +
5968 		    s->selected_line <= s->blame.nlines)
5969 			s->selected_line++;
5970 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5971 			s->first_displayed_line++;
5972 		else
5973 			view->count = 0;
5974 		break;
5975 	case 'c':
5976 	case 'p': {
5977 		struct got_object_id *id = NULL;
5978 
5979 		view->count = 0;
5980 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5981 		    s->first_displayed_line, s->selected_line);
5982 		if (id == NULL)
5983 			break;
5984 		if (ch == 'p') {
5985 			struct got_commit_object *commit, *pcommit;
5986 			struct got_object_qid *pid;
5987 			struct got_object_id *blob_id = NULL;
5988 			int obj_type;
5989 			err = got_object_open_as_commit(&commit,
5990 			    s->repo, id);
5991 			if (err)
5992 				break;
5993 			pid = STAILQ_FIRST(
5994 			    got_object_commit_get_parent_ids(commit));
5995 			if (pid == NULL) {
5996 				got_object_commit_close(commit);
5997 				break;
5998 			}
5999 			/* Check if path history ends here. */
6000 			err = got_object_open_as_commit(&pcommit,
6001 			    s->repo, &pid->id);
6002 			if (err)
6003 				break;
6004 			err = got_object_id_by_path(&blob_id, s->repo,
6005 			    pcommit, s->path);
6006 			got_object_commit_close(pcommit);
6007 			if (err) {
6008 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6009 					err = NULL;
6010 				got_object_commit_close(commit);
6011 				break;
6012 			}
6013 			err = got_object_get_type(&obj_type, s->repo,
6014 			    blob_id);
6015 			free(blob_id);
6016 			/* Can't blame non-blob type objects. */
6017 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6018 				got_object_commit_close(commit);
6019 				break;
6020 			}
6021 			err = got_object_qid_alloc(&s->blamed_commit,
6022 			    &pid->id);
6023 			got_object_commit_close(commit);
6024 		} else {
6025 			if (got_object_id_cmp(id,
6026 			    &s->blamed_commit->id) == 0)
6027 				break;
6028 			err = got_object_qid_alloc(&s->blamed_commit,
6029 			    id);
6030 		}
6031 		if (err)
6032 			break;
6033 		s->done = 1;
6034 		thread_err = stop_blame(&s->blame);
6035 		s->done = 0;
6036 		if (thread_err)
6037 			break;
6038 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6039 		    s->blamed_commit, entry);
6040 		err = run_blame(view);
6041 		if (err)
6042 			break;
6043 		break;
6044 	}
6045 	case 'C': {
6046 		struct got_object_qid *first;
6047 
6048 		view->count = 0;
6049 		first = STAILQ_FIRST(&s->blamed_commits);
6050 		if (!got_object_id_cmp(&first->id, s->commit_id))
6051 			break;
6052 		s->done = 1;
6053 		thread_err = stop_blame(&s->blame);
6054 		s->done = 0;
6055 		if (thread_err)
6056 			break;
6057 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6058 		got_object_qid_free(s->blamed_commit);
6059 		s->blamed_commit =
6060 		    STAILQ_FIRST(&s->blamed_commits);
6061 		err = run_blame(view);
6062 		if (err)
6063 			break;
6064 		break;
6065 	}
6066 	case 'L':
6067 		view->count = 0;
6068 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6069 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6070 		if (s->id_to_log)
6071 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6072 		break;
6073 	case KEY_ENTER:
6074 	case '\r': {
6075 		struct got_object_id *id = NULL;
6076 		struct got_object_qid *pid;
6077 		struct got_commit_object *commit = NULL;
6078 
6079 		view->count = 0;
6080 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6081 		    s->first_displayed_line, s->selected_line);
6082 		if (id == NULL)
6083 			break;
6084 		err = got_object_open_as_commit(&commit, s->repo, id);
6085 		if (err)
6086 			break;
6087 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6088 		if (*new_view) {
6089 			/* traversed from diff view, release diff resources  */
6090 			err = close_diff_view(*new_view);
6091 			if (err)
6092 				break;
6093 			diff_view = *new_view;
6094 		} else {
6095 			if (view_is_parent_view(view))
6096 				view_get_split(view, &begin_y, &begin_x);
6097 
6098 			diff_view = view_open(0, 0, begin_y, begin_x,
6099 			    TOG_VIEW_DIFF);
6100 			if (diff_view == NULL) {
6101 				got_object_commit_close(commit);
6102 				err = got_error_from_errno("view_open");
6103 				break;
6104 			}
6105 		}
6106 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6107 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6108 		got_object_commit_close(commit);
6109 		if (err) {
6110 			view_close(diff_view);
6111 			break;
6112 		}
6113 		s->last_diffed_line = s->first_displayed_line - 1 +
6114 		    s->selected_line;
6115 		if (*new_view)
6116 			break;	/* still open from active diff view */
6117 		if (view_is_parent_view(view) &&
6118 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6119 			err = view_init_hsplit(view, begin_y);
6120 			if (err)
6121 				break;
6122 		}
6123 
6124 		view->focussed = 0;
6125 		diff_view->focussed = 1;
6126 		diff_view->mode = view->mode;
6127 		diff_view->nlines = view->lines - begin_y;
6128 		if (view_is_parent_view(view)) {
6129 			view_transfer_size(diff_view, view);
6130 			err = view_close_child(view);
6131 			if (err)
6132 				break;
6133 			err = view_set_child(view, diff_view);
6134 			if (err)
6135 				break;
6136 			view->focus_child = 1;
6137 		} else
6138 			*new_view = diff_view;
6139 		if (err)
6140 			break;
6141 		break;
6142 	}
6143 	case CTRL('d'):
6144 	case 'd':
6145 		nscroll /= 2;
6146 		/* FALL THROUGH */
6147 	case KEY_NPAGE:
6148 	case CTRL('f'):
6149 	case 'f':
6150 	case ' ':
6151 		if (s->last_displayed_line >= s->blame.nlines &&
6152 		    s->selected_line >= MIN(s->blame.nlines,
6153 		    view->nlines - 2)) {
6154 			view->count = 0;
6155 			break;
6156 		}
6157 		if (s->last_displayed_line >= s->blame.nlines &&
6158 		    s->selected_line < view->nlines - 2) {
6159 			s->selected_line +=
6160 			    MIN(nscroll, s->last_displayed_line -
6161 			    s->first_displayed_line - s->selected_line + 1);
6162 		}
6163 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6164 			s->first_displayed_line += nscroll;
6165 		else
6166 			s->first_displayed_line =
6167 			    s->blame.nlines - (view->nlines - 3);
6168 		break;
6169 	case KEY_RESIZE:
6170 		if (s->selected_line > view->nlines - 2) {
6171 			s->selected_line = MIN(s->blame.nlines,
6172 			    view->nlines - 2);
6173 		}
6174 		break;
6175 	default:
6176 		view->count = 0;
6177 		break;
6178 	}
6179 	return thread_err ? thread_err : err;
6180 }
6181 
6182 static const struct got_error *
6183 reset_blame_view(struct tog_view *view)
6184 {
6185 	const struct got_error *err;
6186 	struct tog_blame_view_state *s = &view->state.blame;
6187 
6188 	view->count = 0;
6189 	s->done = 1;
6190 	err = stop_blame(&s->blame);
6191 	s->done = 0;
6192 	if (err)
6193 		return err;
6194 	return run_blame(view);
6195 }
6196 
6197 static const struct got_error *
6198 cmd_blame(int argc, char *argv[])
6199 {
6200 	const struct got_error *error;
6201 	struct got_repository *repo = NULL;
6202 	struct got_worktree *worktree = NULL;
6203 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6204 	char *link_target = NULL;
6205 	struct got_object_id *commit_id = NULL;
6206 	struct got_commit_object *commit = NULL;
6207 	char *commit_id_str = NULL;
6208 	int ch;
6209 	struct tog_view *view;
6210 	int *pack_fds = NULL;
6211 
6212 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6213 		switch (ch) {
6214 		case 'c':
6215 			commit_id_str = optarg;
6216 			break;
6217 		case 'r':
6218 			repo_path = realpath(optarg, NULL);
6219 			if (repo_path == NULL)
6220 				return got_error_from_errno2("realpath",
6221 				    optarg);
6222 			break;
6223 		default:
6224 			usage_blame();
6225 			/* NOTREACHED */
6226 		}
6227 	}
6228 
6229 	argc -= optind;
6230 	argv += optind;
6231 
6232 	if (argc != 1)
6233 		usage_blame();
6234 
6235 	error = got_repo_pack_fds_open(&pack_fds);
6236 	if (error != NULL)
6237 		goto done;
6238 
6239 	if (repo_path == NULL) {
6240 		cwd = getcwd(NULL, 0);
6241 		if (cwd == NULL)
6242 			return got_error_from_errno("getcwd");
6243 		error = got_worktree_open(&worktree, cwd);
6244 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6245 			goto done;
6246 		if (worktree)
6247 			repo_path =
6248 			    strdup(got_worktree_get_repo_path(worktree));
6249 		else
6250 			repo_path = strdup(cwd);
6251 		if (repo_path == NULL) {
6252 			error = got_error_from_errno("strdup");
6253 			goto done;
6254 		}
6255 	}
6256 
6257 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6258 	if (error != NULL)
6259 		goto done;
6260 
6261 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6262 	    worktree);
6263 	if (error)
6264 		goto done;
6265 
6266 	init_curses();
6267 
6268 	error = apply_unveil(got_repo_get_path(repo), NULL);
6269 	if (error)
6270 		goto done;
6271 
6272 	error = tog_load_refs(repo, 0);
6273 	if (error)
6274 		goto done;
6275 
6276 	if (commit_id_str == NULL) {
6277 		struct got_reference *head_ref;
6278 		error = got_ref_open(&head_ref, repo, worktree ?
6279 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6280 		if (error != NULL)
6281 			goto done;
6282 		error = got_ref_resolve(&commit_id, repo, head_ref);
6283 		got_ref_close(head_ref);
6284 	} else {
6285 		error = got_repo_match_object_id(&commit_id, NULL,
6286 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6287 	}
6288 	if (error != NULL)
6289 		goto done;
6290 
6291 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6292 	if (view == NULL) {
6293 		error = got_error_from_errno("view_open");
6294 		goto done;
6295 	}
6296 
6297 	error = got_object_open_as_commit(&commit, repo, commit_id);
6298 	if (error)
6299 		goto done;
6300 
6301 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6302 	    commit, repo);
6303 	if (error)
6304 		goto done;
6305 
6306 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6307 	    commit_id, repo);
6308 	if (error)
6309 		goto done;
6310 	if (worktree) {
6311 		/* Release work tree lock. */
6312 		got_worktree_close(worktree);
6313 		worktree = NULL;
6314 	}
6315 	error = view_loop(view);
6316 done:
6317 	free(repo_path);
6318 	free(in_repo_path);
6319 	free(link_target);
6320 	free(cwd);
6321 	free(commit_id);
6322 	if (commit)
6323 		got_object_commit_close(commit);
6324 	if (worktree)
6325 		got_worktree_close(worktree);
6326 	if (repo) {
6327 		const struct got_error *close_err = got_repo_close(repo);
6328 		if (error == NULL)
6329 			error = close_err;
6330 	}
6331 	if (pack_fds) {
6332 		const struct got_error *pack_err =
6333 		    got_repo_pack_fds_close(pack_fds);
6334 		if (error == NULL)
6335 			error = pack_err;
6336 	}
6337 	tog_free_refs();
6338 	return error;
6339 }
6340 
6341 static const struct got_error *
6342 draw_tree_entries(struct tog_view *view, const char *parent_path)
6343 {
6344 	struct tog_tree_view_state *s = &view->state.tree;
6345 	const struct got_error *err = NULL;
6346 	struct got_tree_entry *te;
6347 	wchar_t *wline;
6348 	struct tog_color *tc;
6349 	int width, n, nentries, i = 1;
6350 	int limit = view->nlines;
6351 
6352 	s->ndisplayed = 0;
6353 	if (view_is_hsplit_top(view))
6354 		--limit;  /* border */
6355 
6356 	werase(view->window);
6357 
6358 	if (limit == 0)
6359 		return NULL;
6360 
6361 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6362 	    0, 0);
6363 	if (err)
6364 		return err;
6365 	if (view_needs_focus_indication(view))
6366 		wstandout(view->window);
6367 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6368 	if (tc)
6369 		wattr_on(view->window,
6370 		    COLOR_PAIR(tc->colorpair), NULL);
6371 	waddwstr(view->window, wline);
6372 	if (tc)
6373 		wattr_off(view->window,
6374 		    COLOR_PAIR(tc->colorpair), NULL);
6375 	if (view_needs_focus_indication(view))
6376 		wstandend(view->window);
6377 	free(wline);
6378 	wline = NULL;
6379 
6380 	i += s->selected;
6381 	if (s->first_displayed_entry) {
6382 		i += got_tree_entry_get_index(s->first_displayed_entry);
6383 		if (s->tree != s->root)
6384 			++i;  /* account for ".." entry */
6385 	}
6386 	nentries = got_object_tree_get_nentries(s->tree);
6387 	wprintw(view->window, " [%d/%d]", i,
6388 	    nentries + (s->tree == s->root ? 0 : 1));  /* ".." in !root tree */
6389 
6390 	if (width < view->ncols - 1)
6391 		waddch(view->window, '\n');
6392 	if (--limit <= 0)
6393 		return NULL;
6394 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6395 	    0, 0);
6396 	if (err)
6397 		return err;
6398 	waddwstr(view->window, wline);
6399 	free(wline);
6400 	wline = NULL;
6401 	if (width < view->ncols - 1)
6402 		waddch(view->window, '\n');
6403 	if (--limit <= 0)
6404 		return NULL;
6405 	waddch(view->window, '\n');
6406 	if (--limit <= 0)
6407 		return NULL;
6408 
6409 	if (s->first_displayed_entry == NULL) {
6410 		te = got_object_tree_get_first_entry(s->tree);
6411 		if (s->selected == 0) {
6412 			if (view->focussed)
6413 				wstandout(view->window);
6414 			s->selected_entry = NULL;
6415 		}
6416 		waddstr(view->window, "  ..\n");	/* parent directory */
6417 		if (s->selected == 0 && view->focussed)
6418 			wstandend(view->window);
6419 		s->ndisplayed++;
6420 		if (--limit <= 0)
6421 			return NULL;
6422 		n = 1;
6423 	} else {
6424 		n = 0;
6425 		te = s->first_displayed_entry;
6426 	}
6427 
6428 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6429 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6430 		const char *modestr = "";
6431 		mode_t mode;
6432 
6433 		te = got_object_tree_get_entry(s->tree, i);
6434 		mode = got_tree_entry_get_mode(te);
6435 
6436 		if (s->show_ids) {
6437 			err = got_object_id_str(&id_str,
6438 			    got_tree_entry_get_id(te));
6439 			if (err)
6440 				return got_error_from_errno(
6441 				    "got_object_id_str");
6442 		}
6443 		if (got_object_tree_entry_is_submodule(te))
6444 			modestr = "$";
6445 		else if (S_ISLNK(mode)) {
6446 			int i;
6447 
6448 			err = got_tree_entry_get_symlink_target(&link_target,
6449 			    te, s->repo);
6450 			if (err) {
6451 				free(id_str);
6452 				return err;
6453 			}
6454 			for (i = 0; i < strlen(link_target); i++) {
6455 				if (!isprint((unsigned char)link_target[i]))
6456 					link_target[i] = '?';
6457 			}
6458 			modestr = "@";
6459 		}
6460 		else if (S_ISDIR(mode))
6461 			modestr = "/";
6462 		else if (mode & S_IXUSR)
6463 			modestr = "*";
6464 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6465 		    got_tree_entry_get_name(te), modestr,
6466 		    link_target ? " -> ": "",
6467 		    link_target ? link_target : "") == -1) {
6468 			free(id_str);
6469 			free(link_target);
6470 			return got_error_from_errno("asprintf");
6471 		}
6472 		free(id_str);
6473 		free(link_target);
6474 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6475 		    0, 0);
6476 		if (err) {
6477 			free(line);
6478 			break;
6479 		}
6480 		if (n == s->selected) {
6481 			if (view->focussed)
6482 				wstandout(view->window);
6483 			s->selected_entry = te;
6484 		}
6485 		tc = match_color(&s->colors, line);
6486 		if (tc)
6487 			wattr_on(view->window,
6488 			    COLOR_PAIR(tc->colorpair), NULL);
6489 		waddwstr(view->window, wline);
6490 		if (tc)
6491 			wattr_off(view->window,
6492 			    COLOR_PAIR(tc->colorpair), NULL);
6493 		if (width < view->ncols - 1)
6494 			waddch(view->window, '\n');
6495 		if (n == s->selected && view->focussed)
6496 			wstandend(view->window);
6497 		free(line);
6498 		free(wline);
6499 		wline = NULL;
6500 		n++;
6501 		s->ndisplayed++;
6502 		s->last_displayed_entry = te;
6503 		if (--limit <= 0)
6504 			break;
6505 	}
6506 
6507 	return err;
6508 }
6509 
6510 static void
6511 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6512 {
6513 	struct got_tree_entry *te;
6514 	int isroot = s->tree == s->root;
6515 	int i = 0;
6516 
6517 	if (s->first_displayed_entry == NULL)
6518 		return;
6519 
6520 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6521 	while (i++ < maxscroll) {
6522 		if (te == NULL) {
6523 			if (!isroot)
6524 				s->first_displayed_entry = NULL;
6525 			break;
6526 		}
6527 		s->first_displayed_entry = te;
6528 		te = got_tree_entry_get_prev(s->tree, te);
6529 	}
6530 }
6531 
6532 static const struct got_error *
6533 tree_scroll_down(struct tog_view *view, int maxscroll)
6534 {
6535 	struct tog_tree_view_state *s = &view->state.tree;
6536 	struct got_tree_entry *next, *last;
6537 	int n = 0;
6538 
6539 	if (s->first_displayed_entry)
6540 		next = got_tree_entry_get_next(s->tree,
6541 		    s->first_displayed_entry);
6542 	else
6543 		next = got_object_tree_get_first_entry(s->tree);
6544 
6545 	last = s->last_displayed_entry;
6546 	while (next && n++ < maxscroll) {
6547 		if (last) {
6548 			s->last_displayed_entry = last;
6549 			last = got_tree_entry_get_next(s->tree, last);
6550 		}
6551 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6552 			s->first_displayed_entry = next;
6553 			next = got_tree_entry_get_next(s->tree, next);
6554 		}
6555 	}
6556 
6557 	return NULL;
6558 }
6559 
6560 static const struct got_error *
6561 tree_entry_path(char **path, struct tog_parent_trees *parents,
6562     struct got_tree_entry *te)
6563 {
6564 	const struct got_error *err = NULL;
6565 	struct tog_parent_tree *pt;
6566 	size_t len = 2; /* for leading slash and NUL */
6567 
6568 	TAILQ_FOREACH(pt, parents, entry)
6569 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6570 		    + 1 /* slash */;
6571 	if (te)
6572 		len += strlen(got_tree_entry_get_name(te));
6573 
6574 	*path = calloc(1, len);
6575 	if (path == NULL)
6576 		return got_error_from_errno("calloc");
6577 
6578 	(*path)[0] = '/';
6579 	pt = TAILQ_LAST(parents, tog_parent_trees);
6580 	while (pt) {
6581 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6582 		if (strlcat(*path, name, len) >= len) {
6583 			err = got_error(GOT_ERR_NO_SPACE);
6584 			goto done;
6585 		}
6586 		if (strlcat(*path, "/", len) >= len) {
6587 			err = got_error(GOT_ERR_NO_SPACE);
6588 			goto done;
6589 		}
6590 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6591 	}
6592 	if (te) {
6593 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6594 			err = got_error(GOT_ERR_NO_SPACE);
6595 			goto done;
6596 		}
6597 	}
6598 done:
6599 	if (err) {
6600 		free(*path);
6601 		*path = NULL;
6602 	}
6603 	return err;
6604 }
6605 
6606 static const struct got_error *
6607 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6608     struct got_tree_entry *te, struct tog_parent_trees *parents,
6609     struct got_object_id *commit_id, struct got_repository *repo)
6610 {
6611 	const struct got_error *err = NULL;
6612 	char *path;
6613 	struct tog_view *blame_view;
6614 
6615 	*new_view = NULL;
6616 
6617 	err = tree_entry_path(&path, parents, te);
6618 	if (err)
6619 		return err;
6620 
6621 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6622 	if (blame_view == NULL) {
6623 		err = got_error_from_errno("view_open");
6624 		goto done;
6625 	}
6626 
6627 	err = open_blame_view(blame_view, path, commit_id, repo);
6628 	if (err) {
6629 		if (err->code == GOT_ERR_CANCELLED)
6630 			err = NULL;
6631 		view_close(blame_view);
6632 	} else
6633 		*new_view = blame_view;
6634 done:
6635 	free(path);
6636 	return err;
6637 }
6638 
6639 static const struct got_error *
6640 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6641     struct tog_tree_view_state *s)
6642 {
6643 	struct tog_view *log_view;
6644 	const struct got_error *err = NULL;
6645 	char *path;
6646 
6647 	*new_view = NULL;
6648 
6649 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6650 	if (log_view == NULL)
6651 		return got_error_from_errno("view_open");
6652 
6653 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6654 	if (err)
6655 		return err;
6656 
6657 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6658 	    path, 0);
6659 	if (err)
6660 		view_close(log_view);
6661 	else
6662 		*new_view = log_view;
6663 	free(path);
6664 	return err;
6665 }
6666 
6667 static const struct got_error *
6668 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6669     const char *head_ref_name, struct got_repository *repo)
6670 {
6671 	const struct got_error *err = NULL;
6672 	char *commit_id_str = NULL;
6673 	struct tog_tree_view_state *s = &view->state.tree;
6674 	struct got_commit_object *commit = NULL;
6675 
6676 	TAILQ_INIT(&s->parents);
6677 	STAILQ_INIT(&s->colors);
6678 
6679 	s->commit_id = got_object_id_dup(commit_id);
6680 	if (s->commit_id == NULL)
6681 		return got_error_from_errno("got_object_id_dup");
6682 
6683 	err = got_object_open_as_commit(&commit, repo, commit_id);
6684 	if (err)
6685 		goto done;
6686 
6687 	/*
6688 	 * The root is opened here and will be closed when the view is closed.
6689 	 * Any visited subtrees and their path-wise parents are opened and
6690 	 * closed on demand.
6691 	 */
6692 	err = got_object_open_as_tree(&s->root, repo,
6693 	    got_object_commit_get_tree_id(commit));
6694 	if (err)
6695 		goto done;
6696 	s->tree = s->root;
6697 
6698 	err = got_object_id_str(&commit_id_str, commit_id);
6699 	if (err != NULL)
6700 		goto done;
6701 
6702 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6703 		err = got_error_from_errno("asprintf");
6704 		goto done;
6705 	}
6706 
6707 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6708 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6709 	if (head_ref_name) {
6710 		s->head_ref_name = strdup(head_ref_name);
6711 		if (s->head_ref_name == NULL) {
6712 			err = got_error_from_errno("strdup");
6713 			goto done;
6714 		}
6715 	}
6716 	s->repo = repo;
6717 
6718 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6719 		err = add_color(&s->colors, "\\$$",
6720 		    TOG_COLOR_TREE_SUBMODULE,
6721 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6722 		if (err)
6723 			goto done;
6724 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6725 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6726 		if (err)
6727 			goto done;
6728 		err = add_color(&s->colors, "/$",
6729 		    TOG_COLOR_TREE_DIRECTORY,
6730 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6731 		if (err)
6732 			goto done;
6733 
6734 		err = add_color(&s->colors, "\\*$",
6735 		    TOG_COLOR_TREE_EXECUTABLE,
6736 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6737 		if (err)
6738 			goto done;
6739 
6740 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6741 		    get_color_value("TOG_COLOR_COMMIT"));
6742 		if (err)
6743 			goto done;
6744 	}
6745 
6746 	view->show = show_tree_view;
6747 	view->input = input_tree_view;
6748 	view->close = close_tree_view;
6749 	view->search_start = search_start_tree_view;
6750 	view->search_next = search_next_tree_view;
6751 done:
6752 	free(commit_id_str);
6753 	if (commit)
6754 		got_object_commit_close(commit);
6755 	if (err)
6756 		close_tree_view(view);
6757 	return err;
6758 }
6759 
6760 static const struct got_error *
6761 close_tree_view(struct tog_view *view)
6762 {
6763 	struct tog_tree_view_state *s = &view->state.tree;
6764 
6765 	free_colors(&s->colors);
6766 	free(s->tree_label);
6767 	s->tree_label = NULL;
6768 	free(s->commit_id);
6769 	s->commit_id = NULL;
6770 	free(s->head_ref_name);
6771 	s->head_ref_name = NULL;
6772 	while (!TAILQ_EMPTY(&s->parents)) {
6773 		struct tog_parent_tree *parent;
6774 		parent = TAILQ_FIRST(&s->parents);
6775 		TAILQ_REMOVE(&s->parents, parent, entry);
6776 		if (parent->tree != s->root)
6777 			got_object_tree_close(parent->tree);
6778 		free(parent);
6779 
6780 	}
6781 	if (s->tree != NULL && s->tree != s->root)
6782 		got_object_tree_close(s->tree);
6783 	if (s->root)
6784 		got_object_tree_close(s->root);
6785 	return NULL;
6786 }
6787 
6788 static const struct got_error *
6789 search_start_tree_view(struct tog_view *view)
6790 {
6791 	struct tog_tree_view_state *s = &view->state.tree;
6792 
6793 	s->matched_entry = NULL;
6794 	return NULL;
6795 }
6796 
6797 static int
6798 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6799 {
6800 	regmatch_t regmatch;
6801 
6802 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6803 	    0) == 0;
6804 }
6805 
6806 static const struct got_error *
6807 search_next_tree_view(struct tog_view *view)
6808 {
6809 	struct tog_tree_view_state *s = &view->state.tree;
6810 	struct got_tree_entry *te = NULL;
6811 
6812 	if (!view->searching) {
6813 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6814 		return NULL;
6815 	}
6816 
6817 	if (s->matched_entry) {
6818 		if (view->searching == TOG_SEARCH_FORWARD) {
6819 			if (s->selected_entry)
6820 				te = got_tree_entry_get_next(s->tree,
6821 				    s->selected_entry);
6822 			else
6823 				te = got_object_tree_get_first_entry(s->tree);
6824 		} else {
6825 			if (s->selected_entry == NULL)
6826 				te = got_object_tree_get_last_entry(s->tree);
6827 			else
6828 				te = got_tree_entry_get_prev(s->tree,
6829 				    s->selected_entry);
6830 		}
6831 	} else {
6832 		if (s->selected_entry)
6833 			te = s->selected_entry;
6834 		else if (view->searching == TOG_SEARCH_FORWARD)
6835 			te = got_object_tree_get_first_entry(s->tree);
6836 		else
6837 			te = got_object_tree_get_last_entry(s->tree);
6838 	}
6839 
6840 	while (1) {
6841 		if (te == NULL) {
6842 			if (s->matched_entry == NULL) {
6843 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6844 				return NULL;
6845 			}
6846 			if (view->searching == TOG_SEARCH_FORWARD)
6847 				te = got_object_tree_get_first_entry(s->tree);
6848 			else
6849 				te = got_object_tree_get_last_entry(s->tree);
6850 		}
6851 
6852 		if (match_tree_entry(te, &view->regex)) {
6853 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6854 			s->matched_entry = te;
6855 			break;
6856 		}
6857 
6858 		if (view->searching == TOG_SEARCH_FORWARD)
6859 			te = got_tree_entry_get_next(s->tree, te);
6860 		else
6861 			te = got_tree_entry_get_prev(s->tree, te);
6862 	}
6863 
6864 	if (s->matched_entry) {
6865 		s->first_displayed_entry = s->matched_entry;
6866 		s->selected = 0;
6867 	}
6868 
6869 	return NULL;
6870 }
6871 
6872 static const struct got_error *
6873 show_tree_view(struct tog_view *view)
6874 {
6875 	const struct got_error *err = NULL;
6876 	struct tog_tree_view_state *s = &view->state.tree;
6877 	char *parent_path;
6878 
6879 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6880 	if (err)
6881 		return err;
6882 
6883 	err = draw_tree_entries(view, parent_path);
6884 	free(parent_path);
6885 
6886 	view_border(view);
6887 	return err;
6888 }
6889 
6890 static const struct got_error *
6891 tree_goto_line(struct tog_view *view, int nlines)
6892 {
6893 	const struct got_error		 *err = NULL;
6894 	struct tog_tree_view_state	 *s = &view->state.tree;
6895 	struct got_tree_entry		**fte, **lte, **ste;
6896 	int				  g, last, first = 1, i = 1;
6897 	int				  root = s->tree == s->root;
6898 	int				  off = root ? 1 : 2;
6899 
6900 	g = view->gline;
6901 	view->gline = 0;
6902 
6903 	if (g == 0)
6904 		g = 1;
6905 	else if (g > got_object_tree_get_nentries(s->tree))
6906 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
6907 
6908 	fte = &s->first_displayed_entry;
6909 	lte = &s->last_displayed_entry;
6910 	ste = &s->selected_entry;
6911 
6912 	if (*fte != NULL) {
6913 		first = got_tree_entry_get_index(*fte);
6914 		first += off;  /* account for ".." */
6915 	}
6916 	last = got_tree_entry_get_index(*lte);
6917 	last += off;
6918 
6919 	if (g >= first && g <= last && g - first < nlines) {
6920 		s->selected = g - first;
6921 		return NULL;	/* gline is on the current page */
6922 	}
6923 
6924 	if (*ste != NULL) {
6925 		i = got_tree_entry_get_index(*ste);
6926 		i += off;
6927 	}
6928 
6929 	if (i < g) {
6930 		err = tree_scroll_down(view, g - i);
6931 		if (err)
6932 			return err;
6933 		if (got_tree_entry_get_index(*lte) >=
6934 		    got_object_tree_get_nentries(s->tree) - 1 &&
6935 		    first + s->selected < g &&
6936 		    s->selected < s->ndisplayed - 1) {
6937 			first = got_tree_entry_get_index(*fte);
6938 			first += off;
6939 			s->selected = g - first;
6940 		}
6941 	} else if (i > g)
6942 		tree_scroll_up(s, i - g);
6943 
6944 	if (g < nlines &&
6945 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
6946 		s->selected = g - 1;
6947 
6948 	return NULL;
6949 }
6950 
6951 static const struct got_error *
6952 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6953 {
6954 	const struct got_error *err = NULL;
6955 	struct tog_tree_view_state *s = &view->state.tree;
6956 	struct got_tree_entry *te;
6957 	int n, nscroll = view->nlines - 3;
6958 
6959 	if (view->gline)
6960 		return tree_goto_line(view, nscroll);
6961 
6962 	switch (ch) {
6963 	case 'i':
6964 		s->show_ids = !s->show_ids;
6965 		view->count = 0;
6966 		break;
6967 	case 'L':
6968 		view->count = 0;
6969 		if (!s->selected_entry)
6970 			break;
6971 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
6972 		break;
6973 	case 'R':
6974 		view->count = 0;
6975 		err = view_request_new(new_view, view, TOG_VIEW_REF);
6976 		break;
6977 	case 'g':
6978 	case KEY_HOME:
6979 		s->selected = 0;
6980 		view->count = 0;
6981 		if (s->tree == s->root)
6982 			s->first_displayed_entry =
6983 			    got_object_tree_get_first_entry(s->tree);
6984 		else
6985 			s->first_displayed_entry = NULL;
6986 		break;
6987 	case 'G':
6988 	case KEY_END: {
6989 		int eos = view->nlines - 3;
6990 
6991 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6992 			--eos;  /* border */
6993 		s->selected = 0;
6994 		view->count = 0;
6995 		te = got_object_tree_get_last_entry(s->tree);
6996 		for (n = 0; n < eos; n++) {
6997 			if (te == NULL) {
6998 				if (s->tree != s->root) {
6999 					s->first_displayed_entry = NULL;
7000 					n++;
7001 				}
7002 				break;
7003 			}
7004 			s->first_displayed_entry = te;
7005 			te = got_tree_entry_get_prev(s->tree, te);
7006 		}
7007 		if (n > 0)
7008 			s->selected = n - 1;
7009 		break;
7010 	}
7011 	case 'k':
7012 	case KEY_UP:
7013 	case CTRL('p'):
7014 		if (s->selected > 0) {
7015 			s->selected--;
7016 			break;
7017 		}
7018 		tree_scroll_up(s, 1);
7019 		if (s->selected_entry == NULL ||
7020 		    (s->tree == s->root && s->selected_entry ==
7021 		     got_object_tree_get_first_entry(s->tree)))
7022 			view->count = 0;
7023 		break;
7024 	case CTRL('u'):
7025 	case 'u':
7026 		nscroll /= 2;
7027 		/* FALL THROUGH */
7028 	case KEY_PPAGE:
7029 	case CTRL('b'):
7030 	case 'b':
7031 		if (s->tree == s->root) {
7032 			if (got_object_tree_get_first_entry(s->tree) ==
7033 			    s->first_displayed_entry)
7034 				s->selected -= MIN(s->selected, nscroll);
7035 		} else {
7036 			if (s->first_displayed_entry == NULL)
7037 				s->selected -= MIN(s->selected, nscroll);
7038 		}
7039 		tree_scroll_up(s, MAX(0, nscroll));
7040 		if (s->selected_entry == NULL ||
7041 		    (s->tree == s->root && s->selected_entry ==
7042 		     got_object_tree_get_first_entry(s->tree)))
7043 			view->count = 0;
7044 		break;
7045 	case 'j':
7046 	case KEY_DOWN:
7047 	case CTRL('n'):
7048 		if (s->selected < s->ndisplayed - 1) {
7049 			s->selected++;
7050 			break;
7051 		}
7052 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7053 		    == NULL) {
7054 			/* can't scroll any further */
7055 			view->count = 0;
7056 			break;
7057 		}
7058 		tree_scroll_down(view, 1);
7059 		break;
7060 	case CTRL('d'):
7061 	case 'd':
7062 		nscroll /= 2;
7063 		/* FALL THROUGH */
7064 	case KEY_NPAGE:
7065 	case CTRL('f'):
7066 	case 'f':
7067 	case ' ':
7068 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7069 		    == NULL) {
7070 			/* can't scroll any further; move cursor down */
7071 			if (s->selected < s->ndisplayed - 1)
7072 				s->selected += MIN(nscroll,
7073 				    s->ndisplayed - s->selected - 1);
7074 			else
7075 				view->count = 0;
7076 			break;
7077 		}
7078 		tree_scroll_down(view, nscroll);
7079 		break;
7080 	case KEY_ENTER:
7081 	case '\r':
7082 	case KEY_BACKSPACE:
7083 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7084 			struct tog_parent_tree *parent;
7085 			/* user selected '..' */
7086 			if (s->tree == s->root) {
7087 				view->count = 0;
7088 				break;
7089 			}
7090 			parent = TAILQ_FIRST(&s->parents);
7091 			TAILQ_REMOVE(&s->parents, parent,
7092 			    entry);
7093 			got_object_tree_close(s->tree);
7094 			s->tree = parent->tree;
7095 			s->first_displayed_entry =
7096 			    parent->first_displayed_entry;
7097 			s->selected_entry =
7098 			    parent->selected_entry;
7099 			s->selected = parent->selected;
7100 			if (s->selected > view->nlines - 3) {
7101 				err = offset_selection_down(view);
7102 				if (err)
7103 					break;
7104 			}
7105 			free(parent);
7106 		} else if (S_ISDIR(got_tree_entry_get_mode(
7107 		    s->selected_entry))) {
7108 			struct got_tree_object *subtree;
7109 			view->count = 0;
7110 			err = got_object_open_as_tree(&subtree, s->repo,
7111 			    got_tree_entry_get_id(s->selected_entry));
7112 			if (err)
7113 				break;
7114 			err = tree_view_visit_subtree(s, subtree);
7115 			if (err) {
7116 				got_object_tree_close(subtree);
7117 				break;
7118 			}
7119 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7120 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7121 		break;
7122 	case KEY_RESIZE:
7123 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7124 			s->selected = view->nlines - 4;
7125 		view->count = 0;
7126 		break;
7127 	default:
7128 		view->count = 0;
7129 		break;
7130 	}
7131 
7132 	return err;
7133 }
7134 
7135 __dead static void
7136 usage_tree(void)
7137 {
7138 	endwin();
7139 	fprintf(stderr,
7140 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7141 	    getprogname());
7142 	exit(1);
7143 }
7144 
7145 static const struct got_error *
7146 cmd_tree(int argc, char *argv[])
7147 {
7148 	const struct got_error *error;
7149 	struct got_repository *repo = NULL;
7150 	struct got_worktree *worktree = NULL;
7151 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7152 	struct got_object_id *commit_id = NULL;
7153 	struct got_commit_object *commit = NULL;
7154 	const char *commit_id_arg = NULL;
7155 	char *label = NULL;
7156 	struct got_reference *ref = NULL;
7157 	const char *head_ref_name = NULL;
7158 	int ch;
7159 	struct tog_view *view;
7160 	int *pack_fds = NULL;
7161 
7162 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7163 		switch (ch) {
7164 		case 'c':
7165 			commit_id_arg = optarg;
7166 			break;
7167 		case 'r':
7168 			repo_path = realpath(optarg, NULL);
7169 			if (repo_path == NULL)
7170 				return got_error_from_errno2("realpath",
7171 				    optarg);
7172 			break;
7173 		default:
7174 			usage_tree();
7175 			/* NOTREACHED */
7176 		}
7177 	}
7178 
7179 	argc -= optind;
7180 	argv += optind;
7181 
7182 	if (argc > 1)
7183 		usage_tree();
7184 
7185 	error = got_repo_pack_fds_open(&pack_fds);
7186 	if (error != NULL)
7187 		goto done;
7188 
7189 	if (repo_path == NULL) {
7190 		cwd = getcwd(NULL, 0);
7191 		if (cwd == NULL)
7192 			return got_error_from_errno("getcwd");
7193 		error = got_worktree_open(&worktree, cwd);
7194 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7195 			goto done;
7196 		if (worktree)
7197 			repo_path =
7198 			    strdup(got_worktree_get_repo_path(worktree));
7199 		else
7200 			repo_path = strdup(cwd);
7201 		if (repo_path == NULL) {
7202 			error = got_error_from_errno("strdup");
7203 			goto done;
7204 		}
7205 	}
7206 
7207 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7208 	if (error != NULL)
7209 		goto done;
7210 
7211 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7212 	    repo, worktree);
7213 	if (error)
7214 		goto done;
7215 
7216 	init_curses();
7217 
7218 	error = apply_unveil(got_repo_get_path(repo), NULL);
7219 	if (error)
7220 		goto done;
7221 
7222 	error = tog_load_refs(repo, 0);
7223 	if (error)
7224 		goto done;
7225 
7226 	if (commit_id_arg == NULL) {
7227 		error = got_repo_match_object_id(&commit_id, &label,
7228 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7229 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7230 		if (error)
7231 			goto done;
7232 		head_ref_name = label;
7233 	} else {
7234 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7235 		if (error == NULL)
7236 			head_ref_name = got_ref_get_name(ref);
7237 		else if (error->code != GOT_ERR_NOT_REF)
7238 			goto done;
7239 		error = got_repo_match_object_id(&commit_id, NULL,
7240 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7241 		if (error)
7242 			goto done;
7243 	}
7244 
7245 	error = got_object_open_as_commit(&commit, repo, commit_id);
7246 	if (error)
7247 		goto done;
7248 
7249 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7250 	if (view == NULL) {
7251 		error = got_error_from_errno("view_open");
7252 		goto done;
7253 	}
7254 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7255 	if (error)
7256 		goto done;
7257 	if (!got_path_is_root_dir(in_repo_path)) {
7258 		error = tree_view_walk_path(&view->state.tree, commit,
7259 		    in_repo_path);
7260 		if (error)
7261 			goto done;
7262 	}
7263 
7264 	if (worktree) {
7265 		/* Release work tree lock. */
7266 		got_worktree_close(worktree);
7267 		worktree = NULL;
7268 	}
7269 	error = view_loop(view);
7270 done:
7271 	free(repo_path);
7272 	free(cwd);
7273 	free(commit_id);
7274 	free(label);
7275 	if (ref)
7276 		got_ref_close(ref);
7277 	if (repo) {
7278 		const struct got_error *close_err = got_repo_close(repo);
7279 		if (error == NULL)
7280 			error = close_err;
7281 	}
7282 	if (pack_fds) {
7283 		const struct got_error *pack_err =
7284 		    got_repo_pack_fds_close(pack_fds);
7285 		if (error == NULL)
7286 			error = pack_err;
7287 	}
7288 	tog_free_refs();
7289 	return error;
7290 }
7291 
7292 static const struct got_error *
7293 ref_view_load_refs(struct tog_ref_view_state *s)
7294 {
7295 	struct got_reflist_entry *sre;
7296 	struct tog_reflist_entry *re;
7297 
7298 	s->nrefs = 0;
7299 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7300 		if (strncmp(got_ref_get_name(sre->ref),
7301 		    "refs/got/", 9) == 0 &&
7302 		    strncmp(got_ref_get_name(sre->ref),
7303 		    "refs/got/backup/", 16) != 0)
7304 			continue;
7305 
7306 		re = malloc(sizeof(*re));
7307 		if (re == NULL)
7308 			return got_error_from_errno("malloc");
7309 
7310 		re->ref = got_ref_dup(sre->ref);
7311 		if (re->ref == NULL)
7312 			return got_error_from_errno("got_ref_dup");
7313 		re->idx = s->nrefs++;
7314 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7315 	}
7316 
7317 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7318 	return NULL;
7319 }
7320 
7321 static void
7322 ref_view_free_refs(struct tog_ref_view_state *s)
7323 {
7324 	struct tog_reflist_entry *re;
7325 
7326 	while (!TAILQ_EMPTY(&s->refs)) {
7327 		re = TAILQ_FIRST(&s->refs);
7328 		TAILQ_REMOVE(&s->refs, re, entry);
7329 		got_ref_close(re->ref);
7330 		free(re);
7331 	}
7332 }
7333 
7334 static const struct got_error *
7335 open_ref_view(struct tog_view *view, struct got_repository *repo)
7336 {
7337 	const struct got_error *err = NULL;
7338 	struct tog_ref_view_state *s = &view->state.ref;
7339 
7340 	s->selected_entry = 0;
7341 	s->repo = repo;
7342 
7343 	TAILQ_INIT(&s->refs);
7344 	STAILQ_INIT(&s->colors);
7345 
7346 	err = ref_view_load_refs(s);
7347 	if (err)
7348 		return err;
7349 
7350 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7351 		err = add_color(&s->colors, "^refs/heads/",
7352 		    TOG_COLOR_REFS_HEADS,
7353 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7354 		if (err)
7355 			goto done;
7356 
7357 		err = add_color(&s->colors, "^refs/tags/",
7358 		    TOG_COLOR_REFS_TAGS,
7359 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7360 		if (err)
7361 			goto done;
7362 
7363 		err = add_color(&s->colors, "^refs/remotes/",
7364 		    TOG_COLOR_REFS_REMOTES,
7365 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7366 		if (err)
7367 			goto done;
7368 
7369 		err = add_color(&s->colors, "^refs/got/backup/",
7370 		    TOG_COLOR_REFS_BACKUP,
7371 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7372 		if (err)
7373 			goto done;
7374 	}
7375 
7376 	view->show = show_ref_view;
7377 	view->input = input_ref_view;
7378 	view->close = close_ref_view;
7379 	view->search_start = search_start_ref_view;
7380 	view->search_next = search_next_ref_view;
7381 done:
7382 	if (err)
7383 		free_colors(&s->colors);
7384 	return err;
7385 }
7386 
7387 static const struct got_error *
7388 close_ref_view(struct tog_view *view)
7389 {
7390 	struct tog_ref_view_state *s = &view->state.ref;
7391 
7392 	ref_view_free_refs(s);
7393 	free_colors(&s->colors);
7394 
7395 	return NULL;
7396 }
7397 
7398 static const struct got_error *
7399 resolve_reflist_entry(struct got_object_id **commit_id,
7400     struct tog_reflist_entry *re, struct got_repository *repo)
7401 {
7402 	const struct got_error *err = NULL;
7403 	struct got_object_id *obj_id;
7404 	struct got_tag_object *tag = NULL;
7405 	int obj_type;
7406 
7407 	*commit_id = NULL;
7408 
7409 	err = got_ref_resolve(&obj_id, repo, re->ref);
7410 	if (err)
7411 		return err;
7412 
7413 	err = got_object_get_type(&obj_type, repo, obj_id);
7414 	if (err)
7415 		goto done;
7416 
7417 	switch (obj_type) {
7418 	case GOT_OBJ_TYPE_COMMIT:
7419 		*commit_id = obj_id;
7420 		break;
7421 	case GOT_OBJ_TYPE_TAG:
7422 		err = got_object_open_as_tag(&tag, repo, obj_id);
7423 		if (err)
7424 			goto done;
7425 		free(obj_id);
7426 		err = got_object_get_type(&obj_type, repo,
7427 		    got_object_tag_get_object_id(tag));
7428 		if (err)
7429 			goto done;
7430 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7431 			err = got_error(GOT_ERR_OBJ_TYPE);
7432 			goto done;
7433 		}
7434 		*commit_id = got_object_id_dup(
7435 		    got_object_tag_get_object_id(tag));
7436 		if (*commit_id == NULL) {
7437 			err = got_error_from_errno("got_object_id_dup");
7438 			goto done;
7439 		}
7440 		break;
7441 	default:
7442 		err = got_error(GOT_ERR_OBJ_TYPE);
7443 		break;
7444 	}
7445 
7446 done:
7447 	if (tag)
7448 		got_object_tag_close(tag);
7449 	if (err) {
7450 		free(*commit_id);
7451 		*commit_id = NULL;
7452 	}
7453 	return err;
7454 }
7455 
7456 static const struct got_error *
7457 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7458     struct tog_reflist_entry *re, struct got_repository *repo)
7459 {
7460 	struct tog_view *log_view;
7461 	const struct got_error *err = NULL;
7462 	struct got_object_id *commit_id = NULL;
7463 
7464 	*new_view = NULL;
7465 
7466 	err = resolve_reflist_entry(&commit_id, re, repo);
7467 	if (err) {
7468 		if (err->code != GOT_ERR_OBJ_TYPE)
7469 			return err;
7470 		else
7471 			return NULL;
7472 	}
7473 
7474 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7475 	if (log_view == NULL) {
7476 		err = got_error_from_errno("view_open");
7477 		goto done;
7478 	}
7479 
7480 	err = open_log_view(log_view, commit_id, repo,
7481 	    got_ref_get_name(re->ref), "", 0);
7482 done:
7483 	if (err)
7484 		view_close(log_view);
7485 	else
7486 		*new_view = log_view;
7487 	free(commit_id);
7488 	return err;
7489 }
7490 
7491 static void
7492 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7493 {
7494 	struct tog_reflist_entry *re;
7495 	int i = 0;
7496 
7497 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7498 		return;
7499 
7500 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7501 	while (i++ < maxscroll) {
7502 		if (re == NULL)
7503 			break;
7504 		s->first_displayed_entry = re;
7505 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7506 	}
7507 }
7508 
7509 static const struct got_error *
7510 ref_scroll_down(struct tog_view *view, int maxscroll)
7511 {
7512 	struct tog_ref_view_state *s = &view->state.ref;
7513 	struct tog_reflist_entry *next, *last;
7514 	int n = 0;
7515 
7516 	if (s->first_displayed_entry)
7517 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7518 	else
7519 		next = TAILQ_FIRST(&s->refs);
7520 
7521 	last = s->last_displayed_entry;
7522 	while (next && n++ < maxscroll) {
7523 		if (last) {
7524 			s->last_displayed_entry = last;
7525 			last = TAILQ_NEXT(last, entry);
7526 		}
7527 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7528 			s->first_displayed_entry = next;
7529 			next = TAILQ_NEXT(next, entry);
7530 		}
7531 	}
7532 
7533 	return NULL;
7534 }
7535 
7536 static const struct got_error *
7537 search_start_ref_view(struct tog_view *view)
7538 {
7539 	struct tog_ref_view_state *s = &view->state.ref;
7540 
7541 	s->matched_entry = NULL;
7542 	return NULL;
7543 }
7544 
7545 static int
7546 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7547 {
7548 	regmatch_t regmatch;
7549 
7550 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7551 	    0) == 0;
7552 }
7553 
7554 static const struct got_error *
7555 search_next_ref_view(struct tog_view *view)
7556 {
7557 	struct tog_ref_view_state *s = &view->state.ref;
7558 	struct tog_reflist_entry *re = NULL;
7559 
7560 	if (!view->searching) {
7561 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7562 		return NULL;
7563 	}
7564 
7565 	if (s->matched_entry) {
7566 		if (view->searching == TOG_SEARCH_FORWARD) {
7567 			if (s->selected_entry)
7568 				re = TAILQ_NEXT(s->selected_entry, entry);
7569 			else
7570 				re = TAILQ_PREV(s->selected_entry,
7571 				    tog_reflist_head, entry);
7572 		} else {
7573 			if (s->selected_entry == NULL)
7574 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7575 			else
7576 				re = TAILQ_PREV(s->selected_entry,
7577 				    tog_reflist_head, entry);
7578 		}
7579 	} else {
7580 		if (s->selected_entry)
7581 			re = s->selected_entry;
7582 		else if (view->searching == TOG_SEARCH_FORWARD)
7583 			re = TAILQ_FIRST(&s->refs);
7584 		else
7585 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7586 	}
7587 
7588 	while (1) {
7589 		if (re == NULL) {
7590 			if (s->matched_entry == NULL) {
7591 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7592 				return NULL;
7593 			}
7594 			if (view->searching == TOG_SEARCH_FORWARD)
7595 				re = TAILQ_FIRST(&s->refs);
7596 			else
7597 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7598 		}
7599 
7600 		if (match_reflist_entry(re, &view->regex)) {
7601 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7602 			s->matched_entry = re;
7603 			break;
7604 		}
7605 
7606 		if (view->searching == TOG_SEARCH_FORWARD)
7607 			re = TAILQ_NEXT(re, entry);
7608 		else
7609 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7610 	}
7611 
7612 	if (s->matched_entry) {
7613 		s->first_displayed_entry = s->matched_entry;
7614 		s->selected = 0;
7615 	}
7616 
7617 	return NULL;
7618 }
7619 
7620 static const struct got_error *
7621 show_ref_view(struct tog_view *view)
7622 {
7623 	const struct got_error *err = NULL;
7624 	struct tog_ref_view_state *s = &view->state.ref;
7625 	struct tog_reflist_entry *re;
7626 	char *line = NULL;
7627 	wchar_t *wline;
7628 	struct tog_color *tc;
7629 	int width, n;
7630 	int limit = view->nlines;
7631 
7632 	werase(view->window);
7633 
7634 	s->ndisplayed = 0;
7635 	if (view_is_hsplit_top(view))
7636 		--limit;  /* border */
7637 
7638 	if (limit == 0)
7639 		return NULL;
7640 
7641 	re = s->first_displayed_entry;
7642 
7643 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7644 	    s->nrefs) == -1)
7645 		return got_error_from_errno("asprintf");
7646 
7647 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7648 	if (err) {
7649 		free(line);
7650 		return err;
7651 	}
7652 	if (view_needs_focus_indication(view))
7653 		wstandout(view->window);
7654 	waddwstr(view->window, wline);
7655 	if (view_needs_focus_indication(view))
7656 		wstandend(view->window);
7657 	free(wline);
7658 	wline = NULL;
7659 	free(line);
7660 	line = NULL;
7661 	if (width < view->ncols - 1)
7662 		waddch(view->window, '\n');
7663 	if (--limit <= 0)
7664 		return NULL;
7665 
7666 	n = 0;
7667 	while (re && limit > 0) {
7668 		char *line = NULL;
7669 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7670 
7671 		if (s->show_date) {
7672 			struct got_commit_object *ci;
7673 			struct got_tag_object *tag;
7674 			struct got_object_id *id;
7675 			struct tm tm;
7676 			time_t t;
7677 
7678 			err = got_ref_resolve(&id, s->repo, re->ref);
7679 			if (err)
7680 				return err;
7681 			err = got_object_open_as_tag(&tag, s->repo, id);
7682 			if (err) {
7683 				if (err->code != GOT_ERR_OBJ_TYPE) {
7684 					free(id);
7685 					return err;
7686 				}
7687 				err = got_object_open_as_commit(&ci, s->repo,
7688 				    id);
7689 				if (err) {
7690 					free(id);
7691 					return err;
7692 				}
7693 				t = got_object_commit_get_committer_time(ci);
7694 				got_object_commit_close(ci);
7695 			} else {
7696 				t = got_object_tag_get_tagger_time(tag);
7697 				got_object_tag_close(tag);
7698 			}
7699 			free(id);
7700 			if (gmtime_r(&t, &tm) == NULL)
7701 				return got_error_from_errno("gmtime_r");
7702 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7703 				return got_error(GOT_ERR_NO_SPACE);
7704 		}
7705 		if (got_ref_is_symbolic(re->ref)) {
7706 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7707 			    ymd : "", got_ref_get_name(re->ref),
7708 			    got_ref_get_symref_target(re->ref)) == -1)
7709 				return got_error_from_errno("asprintf");
7710 		} else if (s->show_ids) {
7711 			struct got_object_id *id;
7712 			char *id_str;
7713 			err = got_ref_resolve(&id, s->repo, re->ref);
7714 			if (err)
7715 				return err;
7716 			err = got_object_id_str(&id_str, id);
7717 			if (err) {
7718 				free(id);
7719 				return err;
7720 			}
7721 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7722 			    got_ref_get_name(re->ref), id_str) == -1) {
7723 				err = got_error_from_errno("asprintf");
7724 				free(id);
7725 				free(id_str);
7726 				return err;
7727 			}
7728 			free(id);
7729 			free(id_str);
7730 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7731 		    got_ref_get_name(re->ref)) == -1)
7732 			return got_error_from_errno("asprintf");
7733 
7734 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7735 		    0, 0);
7736 		if (err) {
7737 			free(line);
7738 			return err;
7739 		}
7740 		if (n == s->selected) {
7741 			if (view->focussed)
7742 				wstandout(view->window);
7743 			s->selected_entry = re;
7744 		}
7745 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7746 		if (tc)
7747 			wattr_on(view->window,
7748 			    COLOR_PAIR(tc->colorpair), NULL);
7749 		waddwstr(view->window, wline);
7750 		if (tc)
7751 			wattr_off(view->window,
7752 			    COLOR_PAIR(tc->colorpair), NULL);
7753 		if (width < view->ncols - 1)
7754 			waddch(view->window, '\n');
7755 		if (n == s->selected && view->focussed)
7756 			wstandend(view->window);
7757 		free(line);
7758 		free(wline);
7759 		wline = NULL;
7760 		n++;
7761 		s->ndisplayed++;
7762 		s->last_displayed_entry = re;
7763 
7764 		limit--;
7765 		re = TAILQ_NEXT(re, entry);
7766 	}
7767 
7768 	view_border(view);
7769 	return err;
7770 }
7771 
7772 static const struct got_error *
7773 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7774     struct tog_reflist_entry *re, struct got_repository *repo)
7775 {
7776 	const struct got_error *err = NULL;
7777 	struct got_object_id *commit_id = NULL;
7778 	struct tog_view *tree_view;
7779 
7780 	*new_view = NULL;
7781 
7782 	err = resolve_reflist_entry(&commit_id, re, repo);
7783 	if (err) {
7784 		if (err->code != GOT_ERR_OBJ_TYPE)
7785 			return err;
7786 		else
7787 			return NULL;
7788 	}
7789 
7790 
7791 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7792 	if (tree_view == NULL) {
7793 		err = got_error_from_errno("view_open");
7794 		goto done;
7795 	}
7796 
7797 	err = open_tree_view(tree_view, commit_id,
7798 	    got_ref_get_name(re->ref), repo);
7799 	if (err)
7800 		goto done;
7801 
7802 	*new_view = tree_view;
7803 done:
7804 	free(commit_id);
7805 	return err;
7806 }
7807 
7808 static const struct got_error *
7809 ref_goto_line(struct tog_view *view, int nlines)
7810 {
7811 	const struct got_error		*err = NULL;
7812 	struct tog_ref_view_state	*s = &view->state.ref;
7813 	int				 g, idx = s->selected_entry->idx;
7814 
7815 	g = view->gline;
7816 	view->gline = 0;
7817 
7818 	if (g == 0)
7819 		g = 1;
7820 	else if (g > s->nrefs)
7821 		g = s->nrefs;
7822 
7823 	if (g >= s->first_displayed_entry->idx + 1 &&
7824 	    g <= s->last_displayed_entry->idx + 1 &&
7825 	    g - s->first_displayed_entry->idx - 1 < nlines) {
7826 		s->selected = g - s->first_displayed_entry->idx - 1;
7827 		return NULL;
7828 	}
7829 
7830 	if (idx + 1 < g) {
7831 		err = ref_scroll_down(view, g - idx - 1);
7832 		if (err)
7833 			return err;
7834 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
7835 		    s->first_displayed_entry->idx + s->selected < g &&
7836 		    s->selected < s->ndisplayed - 1)
7837 			s->selected = g - s->first_displayed_entry->idx - 1;
7838 	} else if (idx + 1 > g)
7839 		ref_scroll_up(s, idx - g + 1);
7840 
7841 	if (g < nlines && s->first_displayed_entry->idx == 0)
7842 		s->selected = g - 1;
7843 
7844 	return NULL;
7845 
7846 }
7847 
7848 static const struct got_error *
7849 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7850 {
7851 	const struct got_error *err = NULL;
7852 	struct tog_ref_view_state *s = &view->state.ref;
7853 	struct tog_reflist_entry *re;
7854 	int n, nscroll = view->nlines - 1;
7855 
7856 	if (view->gline)
7857 		return ref_goto_line(view, nscroll);
7858 
7859 	switch (ch) {
7860 	case 'i':
7861 		s->show_ids = !s->show_ids;
7862 		view->count = 0;
7863 		break;
7864 	case 'm':
7865 		s->show_date = !s->show_date;
7866 		view->count = 0;
7867 		break;
7868 	case 'o':
7869 		s->sort_by_date = !s->sort_by_date;
7870 		view->count = 0;
7871 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7872 		    got_ref_cmp_by_commit_timestamp_descending :
7873 		    tog_ref_cmp_by_name, s->repo);
7874 		if (err)
7875 			break;
7876 		got_reflist_object_id_map_free(tog_refs_idmap);
7877 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7878 		    &tog_refs, s->repo);
7879 		if (err)
7880 			break;
7881 		ref_view_free_refs(s);
7882 		err = ref_view_load_refs(s);
7883 		break;
7884 	case KEY_ENTER:
7885 	case '\r':
7886 		view->count = 0;
7887 		if (!s->selected_entry)
7888 			break;
7889 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7890 		break;
7891 	case 'T':
7892 		view->count = 0;
7893 		if (!s->selected_entry)
7894 			break;
7895 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
7896 		break;
7897 	case 'g':
7898 	case KEY_HOME:
7899 		s->selected = 0;
7900 		view->count = 0;
7901 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7902 		break;
7903 	case 'G':
7904 	case KEY_END: {
7905 		int eos = view->nlines - 1;
7906 
7907 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7908 			--eos;  /* border */
7909 		s->selected = 0;
7910 		view->count = 0;
7911 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7912 		for (n = 0; n < eos; n++) {
7913 			if (re == NULL)
7914 				break;
7915 			s->first_displayed_entry = re;
7916 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7917 		}
7918 		if (n > 0)
7919 			s->selected = n - 1;
7920 		break;
7921 	}
7922 	case 'k':
7923 	case KEY_UP:
7924 	case CTRL('p'):
7925 		if (s->selected > 0) {
7926 			s->selected--;
7927 			break;
7928 		}
7929 		ref_scroll_up(s, 1);
7930 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7931 			view->count = 0;
7932 		break;
7933 	case CTRL('u'):
7934 	case 'u':
7935 		nscroll /= 2;
7936 		/* FALL THROUGH */
7937 	case KEY_PPAGE:
7938 	case CTRL('b'):
7939 	case 'b':
7940 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7941 			s->selected -= MIN(nscroll, s->selected);
7942 		ref_scroll_up(s, MAX(0, nscroll));
7943 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7944 			view->count = 0;
7945 		break;
7946 	case 'j':
7947 	case KEY_DOWN:
7948 	case CTRL('n'):
7949 		if (s->selected < s->ndisplayed - 1) {
7950 			s->selected++;
7951 			break;
7952 		}
7953 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7954 			/* can't scroll any further */
7955 			view->count = 0;
7956 			break;
7957 		}
7958 		ref_scroll_down(view, 1);
7959 		break;
7960 	case CTRL('d'):
7961 	case 'd':
7962 		nscroll /= 2;
7963 		/* FALL THROUGH */
7964 	case KEY_NPAGE:
7965 	case CTRL('f'):
7966 	case 'f':
7967 	case ' ':
7968 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7969 			/* can't scroll any further; move cursor down */
7970 			if (s->selected < s->ndisplayed - 1)
7971 				s->selected += MIN(nscroll,
7972 				    s->ndisplayed - s->selected - 1);
7973 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7974 				s->selected += s->ndisplayed - s->selected - 1;
7975 			view->count = 0;
7976 			break;
7977 		}
7978 		ref_scroll_down(view, nscroll);
7979 		break;
7980 	case CTRL('l'):
7981 		view->count = 0;
7982 		tog_free_refs();
7983 		err = tog_load_refs(s->repo, s->sort_by_date);
7984 		if (err)
7985 			break;
7986 		ref_view_free_refs(s);
7987 		err = ref_view_load_refs(s);
7988 		break;
7989 	case KEY_RESIZE:
7990 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7991 			s->selected = view->nlines - 2;
7992 		break;
7993 	default:
7994 		view->count = 0;
7995 		break;
7996 	}
7997 
7998 	return err;
7999 }
8000 
8001 __dead static void
8002 usage_ref(void)
8003 {
8004 	endwin();
8005 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8006 	    getprogname());
8007 	exit(1);
8008 }
8009 
8010 static const struct got_error *
8011 cmd_ref(int argc, char *argv[])
8012 {
8013 	const struct got_error *error;
8014 	struct got_repository *repo = NULL;
8015 	struct got_worktree *worktree = NULL;
8016 	char *cwd = NULL, *repo_path = NULL;
8017 	int ch;
8018 	struct tog_view *view;
8019 	int *pack_fds = NULL;
8020 
8021 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8022 		switch (ch) {
8023 		case 'r':
8024 			repo_path = realpath(optarg, NULL);
8025 			if (repo_path == NULL)
8026 				return got_error_from_errno2("realpath",
8027 				    optarg);
8028 			break;
8029 		default:
8030 			usage_ref();
8031 			/* NOTREACHED */
8032 		}
8033 	}
8034 
8035 	argc -= optind;
8036 	argv += optind;
8037 
8038 	if (argc > 1)
8039 		usage_ref();
8040 
8041 	error = got_repo_pack_fds_open(&pack_fds);
8042 	if (error != NULL)
8043 		goto done;
8044 
8045 	if (repo_path == NULL) {
8046 		cwd = getcwd(NULL, 0);
8047 		if (cwd == NULL)
8048 			return got_error_from_errno("getcwd");
8049 		error = got_worktree_open(&worktree, cwd);
8050 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8051 			goto done;
8052 		if (worktree)
8053 			repo_path =
8054 			    strdup(got_worktree_get_repo_path(worktree));
8055 		else
8056 			repo_path = strdup(cwd);
8057 		if (repo_path == NULL) {
8058 			error = got_error_from_errno("strdup");
8059 			goto done;
8060 		}
8061 	}
8062 
8063 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8064 	if (error != NULL)
8065 		goto done;
8066 
8067 	init_curses();
8068 
8069 	error = apply_unveil(got_repo_get_path(repo), NULL);
8070 	if (error)
8071 		goto done;
8072 
8073 	error = tog_load_refs(repo, 0);
8074 	if (error)
8075 		goto done;
8076 
8077 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8078 	if (view == NULL) {
8079 		error = got_error_from_errno("view_open");
8080 		goto done;
8081 	}
8082 
8083 	error = open_ref_view(view, repo);
8084 	if (error)
8085 		goto done;
8086 
8087 	if (worktree) {
8088 		/* Release work tree lock. */
8089 		got_worktree_close(worktree);
8090 		worktree = NULL;
8091 	}
8092 	error = view_loop(view);
8093 done:
8094 	free(repo_path);
8095 	free(cwd);
8096 	if (repo) {
8097 		const struct got_error *close_err = got_repo_close(repo);
8098 		if (close_err)
8099 			error = close_err;
8100 	}
8101 	if (pack_fds) {
8102 		const struct got_error *pack_err =
8103 		    got_repo_pack_fds_close(pack_fds);
8104 		if (error == NULL)
8105 			error = pack_err;
8106 	}
8107 	tog_free_refs();
8108 	return error;
8109 }
8110 
8111 static const struct got_error *
8112 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8113     enum tog_view_type request, int y, int x)
8114 {
8115 	const struct got_error *err = NULL;
8116 
8117 	*new_view = NULL;
8118 
8119 	switch (request) {
8120 	case TOG_VIEW_DIFF:
8121 		if (view->type == TOG_VIEW_LOG) {
8122 			struct tog_log_view_state *s = &view->state.log;
8123 
8124 			err = open_diff_view_for_commit(new_view, y, x,
8125 			    s->selected_entry->commit, s->selected_entry->id,
8126 			    view, s->repo);
8127 		} else
8128 			return got_error_msg(GOT_ERR_NOT_IMPL,
8129 			    "parent/child view pair not supported");
8130 		break;
8131 	case TOG_VIEW_BLAME:
8132 		if (view->type == TOG_VIEW_TREE) {
8133 			struct tog_tree_view_state *s = &view->state.tree;
8134 
8135 			err = blame_tree_entry(new_view, y, x,
8136 			    s->selected_entry, &s->parents, s->commit_id,
8137 			    s->repo);
8138 		} else
8139 			return got_error_msg(GOT_ERR_NOT_IMPL,
8140 			    "parent/child view pair not supported");
8141 		break;
8142 	case TOG_VIEW_LOG:
8143 		if (view->type == TOG_VIEW_BLAME)
8144 			err = log_annotated_line(new_view, y, x,
8145 			    view->state.blame.repo, view->state.blame.id_to_log);
8146 		else if (view->type == TOG_VIEW_TREE)
8147 			err = log_selected_tree_entry(new_view, y, x,
8148 			    &view->state.tree);
8149 		else if (view->type == TOG_VIEW_REF)
8150 			err = log_ref_entry(new_view, y, x,
8151 			    view->state.ref.selected_entry,
8152 			    view->state.ref.repo);
8153 		else
8154 			return got_error_msg(GOT_ERR_NOT_IMPL,
8155 			    "parent/child view pair not supported");
8156 		break;
8157 	case TOG_VIEW_TREE:
8158 		if (view->type == TOG_VIEW_LOG)
8159 			err = browse_commit_tree(new_view, y, x,
8160 			    view->state.log.selected_entry,
8161 			    view->state.log.in_repo_path,
8162 			    view->state.log.head_ref_name,
8163 			    view->state.log.repo);
8164 		else if (view->type == TOG_VIEW_REF)
8165 			err = browse_ref_tree(new_view, y, x,
8166 			    view->state.ref.selected_entry,
8167 			    view->state.ref.repo);
8168 		else
8169 			return got_error_msg(GOT_ERR_NOT_IMPL,
8170 			    "parent/child view pair not supported");
8171 		break;
8172 	case TOG_VIEW_REF:
8173 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8174 		if (*new_view == NULL)
8175 			return got_error_from_errno("view_open");
8176 		if (view->type == TOG_VIEW_LOG)
8177 			err = open_ref_view(*new_view, view->state.log.repo);
8178 		else if (view->type == TOG_VIEW_TREE)
8179 			err = open_ref_view(*new_view, view->state.tree.repo);
8180 		else
8181 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8182 			    "parent/child view pair not supported");
8183 		if (err)
8184 			view_close(*new_view);
8185 		break;
8186 	default:
8187 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8188 	}
8189 
8190 	return err;
8191 }
8192 
8193 /*
8194  * If view was scrolled down to move the selected line into view when opening a
8195  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8196  */
8197 static void
8198 offset_selection_up(struct tog_view *view)
8199 {
8200 	switch (view->type) {
8201 	case TOG_VIEW_BLAME: {
8202 		struct tog_blame_view_state *s = &view->state.blame;
8203 		if (s->first_displayed_line == 1) {
8204 			s->selected_line = MAX(s->selected_line - view->offset,
8205 			    1);
8206 			break;
8207 		}
8208 		if (s->first_displayed_line > view->offset)
8209 			s->first_displayed_line -= view->offset;
8210 		else
8211 			s->first_displayed_line = 1;
8212 		s->selected_line += view->offset;
8213 		break;
8214 	}
8215 	case TOG_VIEW_LOG:
8216 		log_scroll_up(&view->state.log, view->offset);
8217 		view->state.log.selected += view->offset;
8218 		break;
8219 	case TOG_VIEW_REF:
8220 		ref_scroll_up(&view->state.ref, view->offset);
8221 		view->state.ref.selected += view->offset;
8222 		break;
8223 	case TOG_VIEW_TREE:
8224 		tree_scroll_up(&view->state.tree, view->offset);
8225 		view->state.tree.selected += view->offset;
8226 		break;
8227 	default:
8228 		break;
8229 	}
8230 
8231 	view->offset = 0;
8232 }
8233 
8234 /*
8235  * If the selected line is in the section of screen covered by the bottom split,
8236  * scroll down offset lines to move it into view and index its new position.
8237  */
8238 static const struct got_error *
8239 offset_selection_down(struct tog_view *view)
8240 {
8241 	const struct got_error	*err = NULL;
8242 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8243 	int			*selected = NULL;
8244 	int			 header, offset;
8245 
8246 	switch (view->type) {
8247 	case TOG_VIEW_BLAME: {
8248 		struct tog_blame_view_state *s = &view->state.blame;
8249 		header = 3;
8250 		scrolld = NULL;
8251 		if (s->selected_line > view->nlines - header) {
8252 			offset = abs(view->nlines - s->selected_line - header);
8253 			s->first_displayed_line += offset;
8254 			s->selected_line -= offset;
8255 			view->offset = offset;
8256 		}
8257 		break;
8258 	}
8259 	case TOG_VIEW_LOG: {
8260 		struct tog_log_view_state *s = &view->state.log;
8261 		scrolld = &log_scroll_down;
8262 		header = view_is_parent_view(view) ? 3 : 2;
8263 		selected = &s->selected;
8264 		break;
8265 	}
8266 	case TOG_VIEW_REF: {
8267 		struct tog_ref_view_state *s = &view->state.ref;
8268 		scrolld = &ref_scroll_down;
8269 		header = 3;
8270 		selected = &s->selected;
8271 		break;
8272 	}
8273 	case TOG_VIEW_TREE: {
8274 		struct tog_tree_view_state *s = &view->state.tree;
8275 		scrolld = &tree_scroll_down;
8276 		header = 5;
8277 		selected = &s->selected;
8278 		break;
8279 	}
8280 	default:
8281 		selected = NULL;
8282 		scrolld = NULL;
8283 		header = 0;
8284 		break;
8285 	}
8286 
8287 	if (selected && *selected > view->nlines - header) {
8288 		offset = abs(view->nlines - *selected - header);
8289 		view->offset = offset;
8290 		if (scrolld && offset) {
8291 			err = scrolld(view, offset);
8292 			*selected -= offset;
8293 		}
8294 	}
8295 
8296 	return err;
8297 }
8298 
8299 static void
8300 list_commands(FILE *fp)
8301 {
8302 	size_t i;
8303 
8304 	fprintf(fp, "commands:");
8305 	for (i = 0; i < nitems(tog_commands); i++) {
8306 		const struct tog_cmd *cmd = &tog_commands[i];
8307 		fprintf(fp, " %s", cmd->name);
8308 	}
8309 	fputc('\n', fp);
8310 }
8311 
8312 __dead static void
8313 usage(int hflag, int status)
8314 {
8315 	FILE *fp = (status == 0) ? stdout : stderr;
8316 
8317 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8318 	    getprogname());
8319 	if (hflag) {
8320 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8321 		list_commands(fp);
8322 	}
8323 	exit(status);
8324 }
8325 
8326 static char **
8327 make_argv(int argc, ...)
8328 {
8329 	va_list ap;
8330 	char **argv;
8331 	int i;
8332 
8333 	va_start(ap, argc);
8334 
8335 	argv = calloc(argc, sizeof(char *));
8336 	if (argv == NULL)
8337 		err(1, "calloc");
8338 	for (i = 0; i < argc; i++) {
8339 		argv[i] = strdup(va_arg(ap, char *));
8340 		if (argv[i] == NULL)
8341 			err(1, "strdup");
8342 	}
8343 
8344 	va_end(ap);
8345 	return argv;
8346 }
8347 
8348 /*
8349  * Try to convert 'tog path' into a 'tog log path' command.
8350  * The user could simply have mistyped the command rather than knowingly
8351  * provided a path. So check whether argv[0] can in fact be resolved
8352  * to a path in the HEAD commit and print a special error if not.
8353  * This hack is for mpi@ <3
8354  */
8355 static const struct got_error *
8356 tog_log_with_path(int argc, char *argv[])
8357 {
8358 	const struct got_error *error = NULL, *close_err;
8359 	const struct tog_cmd *cmd = NULL;
8360 	struct got_repository *repo = NULL;
8361 	struct got_worktree *worktree = NULL;
8362 	struct got_object_id *commit_id = NULL, *id = NULL;
8363 	struct got_commit_object *commit = NULL;
8364 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8365 	char *commit_id_str = NULL, **cmd_argv = NULL;
8366 	int *pack_fds = NULL;
8367 
8368 	cwd = getcwd(NULL, 0);
8369 	if (cwd == NULL)
8370 		return got_error_from_errno("getcwd");
8371 
8372 	error = got_repo_pack_fds_open(&pack_fds);
8373 	if (error != NULL)
8374 		goto done;
8375 
8376 	error = got_worktree_open(&worktree, cwd);
8377 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8378 		goto done;
8379 
8380 	if (worktree)
8381 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8382 	else
8383 		repo_path = strdup(cwd);
8384 	if (repo_path == NULL) {
8385 		error = got_error_from_errno("strdup");
8386 		goto done;
8387 	}
8388 
8389 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8390 	if (error != NULL)
8391 		goto done;
8392 
8393 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8394 	    repo, worktree);
8395 	if (error)
8396 		goto done;
8397 
8398 	error = tog_load_refs(repo, 0);
8399 	if (error)
8400 		goto done;
8401 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8402 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8403 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8404 	if (error)
8405 		goto done;
8406 
8407 	if (worktree) {
8408 		got_worktree_close(worktree);
8409 		worktree = NULL;
8410 	}
8411 
8412 	error = got_object_open_as_commit(&commit, repo, commit_id);
8413 	if (error)
8414 		goto done;
8415 
8416 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8417 	if (error) {
8418 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8419 			goto done;
8420 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8421 		    getprogname(), argv[0]);
8422 		usage(1, 1);
8423 		/* not reached */
8424 	}
8425 
8426 	error = got_object_id_str(&commit_id_str, commit_id);
8427 	if (error)
8428 		goto done;
8429 
8430 	cmd = &tog_commands[0]; /* log */
8431 	argc = 4;
8432 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8433 	error = cmd->cmd_main(argc, cmd_argv);
8434 done:
8435 	if (repo) {
8436 		close_err = got_repo_close(repo);
8437 		if (error == NULL)
8438 			error = close_err;
8439 	}
8440 	if (commit)
8441 		got_object_commit_close(commit);
8442 	if (worktree)
8443 		got_worktree_close(worktree);
8444 	if (pack_fds) {
8445 		const struct got_error *pack_err =
8446 		    got_repo_pack_fds_close(pack_fds);
8447 		if (error == NULL)
8448 			error = pack_err;
8449 	}
8450 	free(id);
8451 	free(commit_id_str);
8452 	free(commit_id);
8453 	free(cwd);
8454 	free(repo_path);
8455 	free(in_repo_path);
8456 	if (cmd_argv) {
8457 		int i;
8458 		for (i = 0; i < argc; i++)
8459 			free(cmd_argv[i]);
8460 		free(cmd_argv);
8461 	}
8462 	tog_free_refs();
8463 	return error;
8464 }
8465 
8466 int
8467 main(int argc, char *argv[])
8468 {
8469 	const struct got_error *error = NULL;
8470 	const struct tog_cmd *cmd = NULL;
8471 	int ch, hflag = 0, Vflag = 0;
8472 	char **cmd_argv = NULL;
8473 	static const struct option longopts[] = {
8474 	    { "version", no_argument, NULL, 'V' },
8475 	    { NULL, 0, NULL, 0}
8476 	};
8477 	char *diff_algo_str = NULL;
8478 
8479 	setlocale(LC_CTYPE, "");
8480 
8481 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8482 		switch (ch) {
8483 		case 'h':
8484 			hflag = 1;
8485 			break;
8486 		case 'V':
8487 			Vflag = 1;
8488 			break;
8489 		default:
8490 			usage(hflag, 1);
8491 			/* NOTREACHED */
8492 		}
8493 	}
8494 
8495 	argc -= optind;
8496 	argv += optind;
8497 	optind = 1;
8498 	optreset = 1;
8499 
8500 	if (Vflag) {
8501 		got_version_print_str();
8502 		return 0;
8503 	}
8504 
8505 #ifndef PROFILE
8506 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8507 	    NULL) == -1)
8508 		err(1, "pledge");
8509 #endif
8510 
8511 	if (argc == 0) {
8512 		if (hflag)
8513 			usage(hflag, 0);
8514 		/* Build an argument vector which runs a default command. */
8515 		cmd = &tog_commands[0];
8516 		argc = 1;
8517 		cmd_argv = make_argv(argc, cmd->name);
8518 	} else {
8519 		size_t i;
8520 
8521 		/* Did the user specify a command? */
8522 		for (i = 0; i < nitems(tog_commands); i++) {
8523 			if (strncmp(tog_commands[i].name, argv[0],
8524 			    strlen(argv[0])) == 0) {
8525 				cmd = &tog_commands[i];
8526 				break;
8527 			}
8528 		}
8529 	}
8530 
8531 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8532 	if (diff_algo_str) {
8533 		if (strcasecmp(diff_algo_str, "patience") == 0)
8534 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8535 		if (strcasecmp(diff_algo_str, "myers") == 0)
8536 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8537 	}
8538 
8539 	if (cmd == NULL) {
8540 		if (argc != 1)
8541 			usage(0, 1);
8542 		/* No command specified; try log with a path */
8543 		error = tog_log_with_path(argc, argv);
8544 	} else {
8545 		if (hflag)
8546 			cmd->cmd_usage();
8547 		else
8548 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8549 	}
8550 
8551 	endwin();
8552 	putchar('\n');
8553 	if (cmd_argv) {
8554 		int i;
8555 		for (i = 0; i < argc; i++)
8556 			free(cmd_argv[i]);
8557 		free(cmd_argv);
8558 	}
8559 
8560 	if (error && error->code != GOT_ERR_CANCELLED)
8561 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8562 	return 0;
8563 }