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 	col += author_width;
2053 	while (col < avail && author_width < author_display_cols + 2) {
2054 		waddch(view->window, ' ');
2055 		col++;
2056 		author_width++;
2057 	}
2058 	if (tc)
2059 		wattr_off(view->window,
2060 		    COLOR_PAIR(tc->colorpair), NULL);
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 	struct got_object_id *dup;
2101 
2102 	entry = calloc(1, sizeof(*entry));
2103 	if (entry == NULL)
2104 		return NULL;
2105 
2106 	dup = got_object_id_dup(id);
2107 	if (dup == NULL) {
2108 		free(entry);
2109 		return NULL;
2110 	}
2111 
2112 	entry->id = dup;
2113 	entry->commit = commit;
2114 	return entry;
2115 }
2116 
2117 static void
2118 pop_commit(struct commit_queue *commits)
2119 {
2120 	struct commit_queue_entry *entry;
2121 
2122 	entry = TAILQ_FIRST(&commits->head);
2123 	TAILQ_REMOVE(&commits->head, entry, entry);
2124 	got_object_commit_close(entry->commit);
2125 	commits->ncommits--;
2126 	free(entry->id);
2127 	free(entry);
2128 }
2129 
2130 static void
2131 free_commits(struct commit_queue *commits)
2132 {
2133 	while (!TAILQ_EMPTY(&commits->head))
2134 		pop_commit(commits);
2135 }
2136 
2137 static const struct got_error *
2138 match_commit(int *have_match, struct got_object_id *id,
2139     struct got_commit_object *commit, regex_t *regex)
2140 {
2141 	const struct got_error *err = NULL;
2142 	regmatch_t regmatch;
2143 	char *id_str = NULL, *logmsg = NULL;
2144 
2145 	*have_match = 0;
2146 
2147 	err = got_object_id_str(&id_str, id);
2148 	if (err)
2149 		return err;
2150 
2151 	err = got_object_commit_get_logmsg(&logmsg, commit);
2152 	if (err)
2153 		goto done;
2154 
2155 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2156 	    &regmatch, 0) == 0 ||
2157 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2158 	    &regmatch, 0) == 0 ||
2159 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2160 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2161 		*have_match = 1;
2162 done:
2163 	free(id_str);
2164 	free(logmsg);
2165 	return err;
2166 }
2167 
2168 static const struct got_error *
2169 queue_commits(struct tog_log_thread_args *a)
2170 {
2171 	const struct got_error *err = NULL;
2172 
2173 	/*
2174 	 * We keep all commits open throughout the lifetime of the log
2175 	 * view in order to avoid having to re-fetch commits from disk
2176 	 * while updating the display.
2177 	 */
2178 	do {
2179 		struct got_object_id *id;
2180 		struct got_commit_object *commit;
2181 		struct commit_queue_entry *entry;
2182 		int errcode;
2183 
2184 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2185 		    NULL, NULL);
2186 		if (err || id == NULL)
2187 			break;
2188 
2189 		err = got_object_open_as_commit(&commit, a->repo, id);
2190 		if (err)
2191 			break;
2192 		entry = alloc_commit_queue_entry(commit, id);
2193 		if (entry == NULL) {
2194 			err = got_error_from_errno("alloc_commit_queue_entry");
2195 			break;
2196 		}
2197 
2198 		errcode = pthread_mutex_lock(&tog_mutex);
2199 		if (errcode) {
2200 			err = got_error_set_errno(errcode,
2201 			    "pthread_mutex_lock");
2202 			break;
2203 		}
2204 
2205 		entry->idx = a->commits->ncommits;
2206 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2207 		a->commits->ncommits++;
2208 
2209 		if (*a->searching == TOG_SEARCH_FORWARD &&
2210 		    !*a->search_next_done) {
2211 			int have_match;
2212 			err = match_commit(&have_match, id, commit, a->regex);
2213 			if (err)
2214 				break;
2215 			if (have_match)
2216 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2217 		}
2218 
2219 		errcode = pthread_mutex_unlock(&tog_mutex);
2220 		if (errcode && err == NULL)
2221 			err = got_error_set_errno(errcode,
2222 			    "pthread_mutex_unlock");
2223 		if (err)
2224 			break;
2225 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2226 
2227 	return err;
2228 }
2229 
2230 static void
2231 select_commit(struct tog_log_view_state *s)
2232 {
2233 	struct commit_queue_entry *entry;
2234 	int ncommits = 0;
2235 
2236 	entry = s->first_displayed_entry;
2237 	while (entry) {
2238 		if (ncommits == s->selected) {
2239 			s->selected_entry = entry;
2240 			break;
2241 		}
2242 		entry = TAILQ_NEXT(entry, entry);
2243 		ncommits++;
2244 	}
2245 }
2246 
2247 static const struct got_error *
2248 draw_commits(struct tog_view *view)
2249 {
2250 	const struct got_error *err = NULL;
2251 	struct tog_log_view_state *s = &view->state.log;
2252 	struct commit_queue_entry *entry = s->selected_entry;
2253 	int limit = view->nlines;
2254 	int width;
2255 	int ncommits, author_cols = 4;
2256 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2257 	char *refs_str = NULL;
2258 	wchar_t *wline;
2259 	struct tog_color *tc;
2260 	static const size_t date_display_cols = 12;
2261 
2262 	if (view_is_hsplit_top(view))
2263 		--limit;  /* account for border */
2264 
2265 	if (s->selected_entry &&
2266 	    !(view->searching && view->search_next_done == 0)) {
2267 		struct got_reflist_head *refs;
2268 		err = got_object_id_str(&id_str, s->selected_entry->id);
2269 		if (err)
2270 			return err;
2271 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2272 		    s->selected_entry->id);
2273 		if (refs) {
2274 			err = build_refs_str(&refs_str, refs,
2275 			    s->selected_entry->id, s->repo);
2276 			if (err)
2277 				goto done;
2278 		}
2279 	}
2280 
2281 	if (s->thread_args.commits_needed == 0)
2282 		halfdelay(10); /* disable fast refresh */
2283 
2284 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2285 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2286 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2287 		    (view->searching && !view->search_next_done) ?
2288 		    "searching..." : "loading...") == -1) {
2289 			err = got_error_from_errno("asprintf");
2290 			goto done;
2291 		}
2292 	} else {
2293 		const char *search_str = NULL;
2294 
2295 		if (view->searching) {
2296 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2297 				search_str = "no more matches";
2298 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2299 				search_str = "no matches found";
2300 			else if (!view->search_next_done)
2301 				search_str = "searching...";
2302 		}
2303 
2304 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2305 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2306 		    search_str ? search_str :
2307 		    (refs_str ? refs_str : "")) == -1) {
2308 			err = got_error_from_errno("asprintf");
2309 			goto done;
2310 		}
2311 	}
2312 
2313 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2314 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2315 		    "........................................",
2316 		    s->in_repo_path, ncommits_str) == -1) {
2317 			err = got_error_from_errno("asprintf");
2318 			header = NULL;
2319 			goto done;
2320 		}
2321 	} else if (asprintf(&header, "commit %s%s",
2322 	    id_str ? id_str : "........................................",
2323 	    ncommits_str) == -1) {
2324 		err = got_error_from_errno("asprintf");
2325 		header = NULL;
2326 		goto done;
2327 	}
2328 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2329 	if (err)
2330 		goto done;
2331 
2332 	werase(view->window);
2333 
2334 	if (view_needs_focus_indication(view))
2335 		wstandout(view->window);
2336 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2337 	if (tc)
2338 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2339 	waddwstr(view->window, wline);
2340 	while (width < view->ncols) {
2341 		waddch(view->window, ' ');
2342 		width++;
2343 	}
2344 	if (tc)
2345 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2346 	if (view_needs_focus_indication(view))
2347 		wstandend(view->window);
2348 	free(wline);
2349 	if (limit <= 1)
2350 		goto done;
2351 
2352 	/* Grow author column size if necessary, and set view->maxx. */
2353 	entry = s->first_displayed_entry;
2354 	ncommits = 0;
2355 	view->maxx = 0;
2356 	while (entry) {
2357 		struct got_commit_object *c = entry->commit;
2358 		char *author, *eol, *msg, *msg0;
2359 		wchar_t *wauthor, *wmsg;
2360 		int width;
2361 		if (ncommits >= limit - 1)
2362 			break;
2363 		if (s->use_committer)
2364 			author = strdup(got_object_commit_get_committer(c));
2365 		else
2366 			author = strdup(got_object_commit_get_author(c));
2367 		if (author == NULL) {
2368 			err = got_error_from_errno("strdup");
2369 			goto done;
2370 		}
2371 		err = format_author(&wauthor, &width, author, COLS,
2372 		    date_display_cols);
2373 		if (author_cols < width)
2374 			author_cols = width;
2375 		free(wauthor);
2376 		free(author);
2377 		if (err)
2378 			goto done;
2379 		err = got_object_commit_get_logmsg(&msg0, c);
2380 		if (err)
2381 			goto done;
2382 		msg = msg0;
2383 		while (*msg == '\n')
2384 			++msg;
2385 		if ((eol = strchr(msg, '\n')))
2386 			*eol = '\0';
2387 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2388 		    date_display_cols + author_cols, 0);
2389 		if (err)
2390 			goto done;
2391 		view->maxx = MAX(view->maxx, width);
2392 		free(msg0);
2393 		free(wmsg);
2394 		ncommits++;
2395 		entry = TAILQ_NEXT(entry, entry);
2396 	}
2397 
2398 	entry = s->first_displayed_entry;
2399 	s->last_displayed_entry = s->first_displayed_entry;
2400 	ncommits = 0;
2401 	while (entry) {
2402 		if (ncommits >= limit - 1)
2403 			break;
2404 		if (ncommits == s->selected)
2405 			wstandout(view->window);
2406 		err = draw_commit(view, entry->commit, entry->id,
2407 		    date_display_cols, author_cols);
2408 		if (ncommits == s->selected)
2409 			wstandend(view->window);
2410 		if (err)
2411 			goto done;
2412 		ncommits++;
2413 		s->last_displayed_entry = entry;
2414 		entry = TAILQ_NEXT(entry, entry);
2415 	}
2416 
2417 	view_border(view);
2418 done:
2419 	free(id_str);
2420 	free(refs_str);
2421 	free(ncommits_str);
2422 	free(header);
2423 	return err;
2424 }
2425 
2426 static void
2427 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2428 {
2429 	struct commit_queue_entry *entry;
2430 	int nscrolled = 0;
2431 
2432 	entry = TAILQ_FIRST(&s->commits.head);
2433 	if (s->first_displayed_entry == entry)
2434 		return;
2435 
2436 	entry = s->first_displayed_entry;
2437 	while (entry && nscrolled < maxscroll) {
2438 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2439 		if (entry) {
2440 			s->first_displayed_entry = entry;
2441 			nscrolled++;
2442 		}
2443 	}
2444 }
2445 
2446 static const struct got_error *
2447 trigger_log_thread(struct tog_view *view, int wait)
2448 {
2449 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2450 	int errcode;
2451 
2452 	halfdelay(1); /* fast refresh while loading commits */
2453 
2454 	while (!ta->log_complete && !tog_thread_error &&
2455 	    (ta->commits_needed > 0 || ta->load_all)) {
2456 		/* Wake the log thread. */
2457 		errcode = pthread_cond_signal(&ta->need_commits);
2458 		if (errcode)
2459 			return got_error_set_errno(errcode,
2460 			    "pthread_cond_signal");
2461 
2462 		/*
2463 		 * The mutex will be released while the view loop waits
2464 		 * in wgetch(), at which time the log thread will run.
2465 		 */
2466 		if (!wait)
2467 			break;
2468 
2469 		/* Display progress update in log view. */
2470 		show_log_view(view);
2471 		update_panels();
2472 		doupdate();
2473 
2474 		/* Wait right here while next commit is being loaded. */
2475 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2476 		if (errcode)
2477 			return got_error_set_errno(errcode,
2478 			    "pthread_cond_wait");
2479 
2480 		/* Display progress update in log view. */
2481 		show_log_view(view);
2482 		update_panels();
2483 		doupdate();
2484 	}
2485 
2486 	return NULL;
2487 }
2488 
2489 static const struct got_error *
2490 request_log_commits(struct tog_view *view)
2491 {
2492 	struct tog_log_view_state	*state = &view->state.log;
2493 	const struct got_error		*err = NULL;
2494 
2495 	if (state->thread_args.log_complete)
2496 		return NULL;
2497 
2498 	state->thread_args.commits_needed += view->nscrolled;
2499 	err = trigger_log_thread(view, 1);
2500 	view->nscrolled = 0;
2501 
2502 	return err;
2503 }
2504 
2505 static const struct got_error *
2506 log_scroll_down(struct tog_view *view, int maxscroll)
2507 {
2508 	struct tog_log_view_state *s = &view->state.log;
2509 	const struct got_error *err = NULL;
2510 	struct commit_queue_entry *pentry;
2511 	int nscrolled = 0, ncommits_needed;
2512 
2513 	if (s->last_displayed_entry == NULL)
2514 		return NULL;
2515 
2516 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2517 	if (s->commits.ncommits < ncommits_needed &&
2518 	    !s->thread_args.log_complete) {
2519 		/*
2520 		 * Ask the log thread for required amount of commits.
2521 		 */
2522 		s->thread_args.commits_needed +=
2523 		    ncommits_needed - s->commits.ncommits;
2524 		err = trigger_log_thread(view, 1);
2525 		if (err)
2526 			return err;
2527 	}
2528 
2529 	do {
2530 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2531 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2532 			break;
2533 
2534 		s->last_displayed_entry = pentry ?
2535 		    pentry : s->last_displayed_entry;;
2536 
2537 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2538 		if (pentry == NULL)
2539 			break;
2540 		s->first_displayed_entry = pentry;
2541 	} while (++nscrolled < maxscroll);
2542 
2543 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2544 		view->nscrolled += nscrolled;
2545 	else
2546 		view->nscrolled = 0;
2547 
2548 	return err;
2549 }
2550 
2551 static const struct got_error *
2552 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2553     struct got_commit_object *commit, struct got_object_id *commit_id,
2554     struct tog_view *log_view, struct got_repository *repo)
2555 {
2556 	const struct got_error *err;
2557 	struct got_object_qid *parent_id;
2558 	struct tog_view *diff_view;
2559 
2560 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2561 	if (diff_view == NULL)
2562 		return got_error_from_errno("view_open");
2563 
2564 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2565 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2566 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2567 	if (err == NULL)
2568 		*new_view = diff_view;
2569 	return err;
2570 }
2571 
2572 static const struct got_error *
2573 tree_view_visit_subtree(struct tog_tree_view_state *s,
2574     struct got_tree_object *subtree)
2575 {
2576 	struct tog_parent_tree *parent;
2577 
2578 	parent = calloc(1, sizeof(*parent));
2579 	if (parent == NULL)
2580 		return got_error_from_errno("calloc");
2581 
2582 	parent->tree = s->tree;
2583 	parent->first_displayed_entry = s->first_displayed_entry;
2584 	parent->selected_entry = s->selected_entry;
2585 	parent->selected = s->selected;
2586 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2587 	s->tree = subtree;
2588 	s->selected = 0;
2589 	s->first_displayed_entry = NULL;
2590 	return NULL;
2591 }
2592 
2593 static const struct got_error *
2594 tree_view_walk_path(struct tog_tree_view_state *s,
2595     struct got_commit_object *commit, const char *path)
2596 {
2597 	const struct got_error *err = NULL;
2598 	struct got_tree_object *tree = NULL;
2599 	const char *p;
2600 	char *slash, *subpath = NULL;
2601 
2602 	/* Walk the path and open corresponding tree objects. */
2603 	p = path;
2604 	while (*p) {
2605 		struct got_tree_entry *te;
2606 		struct got_object_id *tree_id;
2607 		char *te_name;
2608 
2609 		while (p[0] == '/')
2610 			p++;
2611 
2612 		/* Ensure the correct subtree entry is selected. */
2613 		slash = strchr(p, '/');
2614 		if (slash == NULL)
2615 			te_name = strdup(p);
2616 		else
2617 			te_name = strndup(p, slash - p);
2618 		if (te_name == NULL) {
2619 			err = got_error_from_errno("strndup");
2620 			break;
2621 		}
2622 		te = got_object_tree_find_entry(s->tree, te_name);
2623 		if (te == NULL) {
2624 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2625 			free(te_name);
2626 			break;
2627 		}
2628 		free(te_name);
2629 		s->first_displayed_entry = s->selected_entry = te;
2630 
2631 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2632 			break; /* jump to this file's entry */
2633 
2634 		slash = strchr(p, '/');
2635 		if (slash)
2636 			subpath = strndup(path, slash - path);
2637 		else
2638 			subpath = strdup(path);
2639 		if (subpath == NULL) {
2640 			err = got_error_from_errno("strdup");
2641 			break;
2642 		}
2643 
2644 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2645 		    subpath);
2646 		if (err)
2647 			break;
2648 
2649 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2650 		free(tree_id);
2651 		if (err)
2652 			break;
2653 
2654 		err = tree_view_visit_subtree(s, tree);
2655 		if (err) {
2656 			got_object_tree_close(tree);
2657 			break;
2658 		}
2659 		if (slash == NULL)
2660 			break;
2661 		free(subpath);
2662 		subpath = NULL;
2663 		p = slash;
2664 	}
2665 
2666 	free(subpath);
2667 	return err;
2668 }
2669 
2670 static const struct got_error *
2671 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2672     struct commit_queue_entry *entry, const char *path,
2673     const char *head_ref_name, struct got_repository *repo)
2674 {
2675 	const struct got_error *err = NULL;
2676 	struct tog_tree_view_state *s;
2677 	struct tog_view *tree_view;
2678 
2679 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2680 	if (tree_view == NULL)
2681 		return got_error_from_errno("view_open");
2682 
2683 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2684 	if (err)
2685 		return err;
2686 	s = &tree_view->state.tree;
2687 
2688 	*new_view = tree_view;
2689 
2690 	if (got_path_is_root_dir(path))
2691 		return NULL;
2692 
2693 	return tree_view_walk_path(s, entry->commit, path);
2694 }
2695 
2696 static const struct got_error *
2697 block_signals_used_by_main_thread(void)
2698 {
2699 	sigset_t sigset;
2700 	int errcode;
2701 
2702 	if (sigemptyset(&sigset) == -1)
2703 		return got_error_from_errno("sigemptyset");
2704 
2705 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2706 	if (sigaddset(&sigset, SIGWINCH) == -1)
2707 		return got_error_from_errno("sigaddset");
2708 	if (sigaddset(&sigset, SIGCONT) == -1)
2709 		return got_error_from_errno("sigaddset");
2710 	if (sigaddset(&sigset, SIGINT) == -1)
2711 		return got_error_from_errno("sigaddset");
2712 	if (sigaddset(&sigset, SIGTERM) == -1)
2713 		return got_error_from_errno("sigaddset");
2714 
2715 	/* ncurses handles SIGTSTP */
2716 	if (sigaddset(&sigset, SIGTSTP) == -1)
2717 		return got_error_from_errno("sigaddset");
2718 
2719 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2720 	if (errcode)
2721 		return got_error_set_errno(errcode, "pthread_sigmask");
2722 
2723 	return NULL;
2724 }
2725 
2726 static void *
2727 log_thread(void *arg)
2728 {
2729 	const struct got_error *err = NULL;
2730 	int errcode = 0;
2731 	struct tog_log_thread_args *a = arg;
2732 	int done = 0;
2733 
2734 	/*
2735 	 * Sync startup with main thread such that we begin our
2736 	 * work once view_input() has released the mutex.
2737 	 */
2738 	errcode = pthread_mutex_lock(&tog_mutex);
2739 	if (errcode) {
2740 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2741 		return (void *)err;
2742 	}
2743 
2744 	err = block_signals_used_by_main_thread();
2745 	if (err) {
2746 		pthread_mutex_unlock(&tog_mutex);
2747 		goto done;
2748 	}
2749 
2750 	while (!done && !err && !tog_fatal_signal_received()) {
2751 		errcode = pthread_mutex_unlock(&tog_mutex);
2752 		if (errcode) {
2753 			err = got_error_set_errno(errcode,
2754 			    "pthread_mutex_unlock");
2755 			goto done;
2756 		}
2757 		err = queue_commits(a);
2758 		if (err) {
2759 			if (err->code != GOT_ERR_ITER_COMPLETED)
2760 				goto done;
2761 			err = NULL;
2762 			done = 1;
2763 		} else if (a->commits_needed > 0 && !a->load_all)
2764 			a->commits_needed--;
2765 
2766 		errcode = pthread_mutex_lock(&tog_mutex);
2767 		if (errcode) {
2768 			err = got_error_set_errno(errcode,
2769 			    "pthread_mutex_lock");
2770 			goto done;
2771 		} else if (*a->quit)
2772 			done = 1;
2773 		else if (*a->first_displayed_entry == NULL) {
2774 			*a->first_displayed_entry =
2775 			    TAILQ_FIRST(&a->commits->head);
2776 			*a->selected_entry = *a->first_displayed_entry;
2777 		}
2778 
2779 		errcode = pthread_cond_signal(&a->commit_loaded);
2780 		if (errcode) {
2781 			err = got_error_set_errno(errcode,
2782 			    "pthread_cond_signal");
2783 			pthread_mutex_unlock(&tog_mutex);
2784 			goto done;
2785 		}
2786 
2787 		if (done)
2788 			a->commits_needed = 0;
2789 		else {
2790 			if (a->commits_needed == 0 && !a->load_all) {
2791 				errcode = pthread_cond_wait(&a->need_commits,
2792 				    &tog_mutex);
2793 				if (errcode) {
2794 					err = got_error_set_errno(errcode,
2795 					    "pthread_cond_wait");
2796 					pthread_mutex_unlock(&tog_mutex);
2797 					goto done;
2798 				}
2799 				if (*a->quit)
2800 					done = 1;
2801 			}
2802 		}
2803 	}
2804 	a->log_complete = 1;
2805 	errcode = pthread_mutex_unlock(&tog_mutex);
2806 	if (errcode)
2807 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2808 done:
2809 	if (err) {
2810 		tog_thread_error = 1;
2811 		pthread_cond_signal(&a->commit_loaded);
2812 	}
2813 	return (void *)err;
2814 }
2815 
2816 static const struct got_error *
2817 stop_log_thread(struct tog_log_view_state *s)
2818 {
2819 	const struct got_error *err = NULL, *thread_err = NULL;
2820 	int errcode;
2821 
2822 	if (s->thread) {
2823 		s->quit = 1;
2824 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2825 		if (errcode)
2826 			return got_error_set_errno(errcode,
2827 			    "pthread_cond_signal");
2828 		errcode = pthread_mutex_unlock(&tog_mutex);
2829 		if (errcode)
2830 			return got_error_set_errno(errcode,
2831 			    "pthread_mutex_unlock");
2832 		errcode = pthread_join(s->thread, (void **)&thread_err);
2833 		if (errcode)
2834 			return got_error_set_errno(errcode, "pthread_join");
2835 		errcode = pthread_mutex_lock(&tog_mutex);
2836 		if (errcode)
2837 			return got_error_set_errno(errcode,
2838 			    "pthread_mutex_lock");
2839 		s->thread = 0; //NULL;
2840 	}
2841 
2842 	if (s->thread_args.repo) {
2843 		err = got_repo_close(s->thread_args.repo);
2844 		s->thread_args.repo = NULL;
2845 	}
2846 
2847 	if (s->thread_args.pack_fds) {
2848 		const struct got_error *pack_err =
2849 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2850 		if (err == NULL)
2851 			err = pack_err;
2852 		s->thread_args.pack_fds = NULL;
2853 	}
2854 
2855 	if (s->thread_args.graph) {
2856 		got_commit_graph_close(s->thread_args.graph);
2857 		s->thread_args.graph = NULL;
2858 	}
2859 
2860 	return err ? err : thread_err;
2861 }
2862 
2863 static const struct got_error *
2864 close_log_view(struct tog_view *view)
2865 {
2866 	const struct got_error *err = NULL;
2867 	struct tog_log_view_state *s = &view->state.log;
2868 	int errcode;
2869 
2870 	err = stop_log_thread(s);
2871 
2872 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2873 	if (errcode && err == NULL)
2874 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2875 
2876 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2877 	if (errcode && err == NULL)
2878 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2879 
2880 	free_commits(&s->commits);
2881 	free(s->in_repo_path);
2882 	s->in_repo_path = NULL;
2883 	free(s->start_id);
2884 	s->start_id = NULL;
2885 	free(s->head_ref_name);
2886 	s->head_ref_name = NULL;
2887 	return err;
2888 }
2889 
2890 static const struct got_error *
2891 search_start_log_view(struct tog_view *view)
2892 {
2893 	struct tog_log_view_state *s = &view->state.log;
2894 
2895 	s->matched_entry = NULL;
2896 	s->search_entry = NULL;
2897 	return NULL;
2898 }
2899 
2900 static const struct got_error *
2901 search_next_log_view(struct tog_view *view)
2902 {
2903 	const struct got_error *err = NULL;
2904 	struct tog_log_view_state *s = &view->state.log;
2905 	struct commit_queue_entry *entry;
2906 
2907 	/* Display progress update in log view. */
2908 	show_log_view(view);
2909 	update_panels();
2910 	doupdate();
2911 
2912 	if (s->search_entry) {
2913 		int errcode, ch;
2914 		errcode = pthread_mutex_unlock(&tog_mutex);
2915 		if (errcode)
2916 			return got_error_set_errno(errcode,
2917 			    "pthread_mutex_unlock");
2918 		ch = wgetch(view->window);
2919 		errcode = pthread_mutex_lock(&tog_mutex);
2920 		if (errcode)
2921 			return got_error_set_errno(errcode,
2922 			    "pthread_mutex_lock");
2923 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2924 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2925 			return NULL;
2926 		}
2927 		if (view->searching == TOG_SEARCH_FORWARD)
2928 			entry = TAILQ_NEXT(s->search_entry, entry);
2929 		else
2930 			entry = TAILQ_PREV(s->search_entry,
2931 			    commit_queue_head, entry);
2932 	} else if (s->matched_entry) {
2933 		int matched_idx = s->matched_entry->idx;
2934 		int selected_idx = s->selected_entry->idx;
2935 
2936 		/*
2937 		 * If the user has moved the cursor after we hit a match,
2938 		 * the position from where we should continue searching
2939 		 * might have changed.
2940 		 */
2941 		if (view->searching == TOG_SEARCH_FORWARD) {
2942 			if (matched_idx > selected_idx)
2943 				entry = TAILQ_NEXT(s->selected_entry, entry);
2944 			else
2945 				entry = TAILQ_NEXT(s->matched_entry, entry);
2946 		} else {
2947 			if (matched_idx < selected_idx)
2948 				entry = TAILQ_PREV(s->selected_entry,
2949 						commit_queue_head, entry);
2950 			else
2951 				entry = TAILQ_PREV(s->matched_entry,
2952 						commit_queue_head, entry);
2953 		}
2954 	} else {
2955 		entry = s->selected_entry;
2956 	}
2957 
2958 	while (1) {
2959 		int have_match = 0;
2960 
2961 		if (entry == NULL) {
2962 			if (s->thread_args.log_complete ||
2963 			    view->searching == TOG_SEARCH_BACKWARD) {
2964 				view->search_next_done =
2965 				    (s->matched_entry == NULL ?
2966 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2967 				s->search_entry = NULL;
2968 				return NULL;
2969 			}
2970 			/*
2971 			 * Poke the log thread for more commits and return,
2972 			 * allowing the main loop to make progress. Search
2973 			 * will resume at s->search_entry once we come back.
2974 			 */
2975 			s->thread_args.commits_needed++;
2976 			return trigger_log_thread(view, 0);
2977 		}
2978 
2979 		err = match_commit(&have_match, entry->id, entry->commit,
2980 		    &view->regex);
2981 		if (err)
2982 			break;
2983 		if (have_match) {
2984 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2985 			s->matched_entry = entry;
2986 			break;
2987 		}
2988 
2989 		s->search_entry = entry;
2990 		if (view->searching == TOG_SEARCH_FORWARD)
2991 			entry = TAILQ_NEXT(entry, entry);
2992 		else
2993 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2994 	}
2995 
2996 	if (s->matched_entry) {
2997 		int cur = s->selected_entry->idx;
2998 		while (cur < s->matched_entry->idx) {
2999 			err = input_log_view(NULL, view, KEY_DOWN);
3000 			if (err)
3001 				return err;
3002 			cur++;
3003 		}
3004 		while (cur > s->matched_entry->idx) {
3005 			err = input_log_view(NULL, view, KEY_UP);
3006 			if (err)
3007 				return err;
3008 			cur--;
3009 		}
3010 	}
3011 
3012 	s->search_entry = NULL;
3013 
3014 	return NULL;
3015 }
3016 
3017 static const struct got_error *
3018 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3019     struct got_repository *repo, const char *head_ref_name,
3020     const char *in_repo_path, int log_branches)
3021 {
3022 	const struct got_error *err = NULL;
3023 	struct tog_log_view_state *s = &view->state.log;
3024 	struct got_repository *thread_repo = NULL;
3025 	struct got_commit_graph *thread_graph = NULL;
3026 	int errcode;
3027 
3028 	if (in_repo_path != s->in_repo_path) {
3029 		free(s->in_repo_path);
3030 		s->in_repo_path = strdup(in_repo_path);
3031 		if (s->in_repo_path == NULL)
3032 			return got_error_from_errno("strdup");
3033 	}
3034 
3035 	/* The commit queue only contains commits being displayed. */
3036 	TAILQ_INIT(&s->commits.head);
3037 	s->commits.ncommits = 0;
3038 
3039 	s->repo = repo;
3040 	if (head_ref_name) {
3041 		s->head_ref_name = strdup(head_ref_name);
3042 		if (s->head_ref_name == NULL) {
3043 			err = got_error_from_errno("strdup");
3044 			goto done;
3045 		}
3046 	}
3047 	s->start_id = got_object_id_dup(start_id);
3048 	if (s->start_id == NULL) {
3049 		err = got_error_from_errno("got_object_id_dup");
3050 		goto done;
3051 	}
3052 	s->log_branches = log_branches;
3053 
3054 	STAILQ_INIT(&s->colors);
3055 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3056 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3057 		    get_color_value("TOG_COLOR_COMMIT"));
3058 		if (err)
3059 			goto done;
3060 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3061 		    get_color_value("TOG_COLOR_AUTHOR"));
3062 		if (err) {
3063 			free_colors(&s->colors);
3064 			goto done;
3065 		}
3066 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3067 		    get_color_value("TOG_COLOR_DATE"));
3068 		if (err) {
3069 			free_colors(&s->colors);
3070 			goto done;
3071 		}
3072 	}
3073 
3074 	view->show = show_log_view;
3075 	view->input = input_log_view;
3076 	view->resize = resize_log_view;
3077 	view->close = close_log_view;
3078 	view->search_start = search_start_log_view;
3079 	view->search_next = search_next_log_view;
3080 
3081 	if (s->thread_args.pack_fds == NULL) {
3082 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3083 		if (err)
3084 			goto done;
3085 	}
3086 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3087 	    s->thread_args.pack_fds);
3088 	if (err)
3089 		goto done;
3090 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3091 	    !s->log_branches);
3092 	if (err)
3093 		goto done;
3094 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3095 	    s->repo, NULL, NULL);
3096 	if (err)
3097 		goto done;
3098 
3099 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3100 	if (errcode) {
3101 		err = got_error_set_errno(errcode, "pthread_cond_init");
3102 		goto done;
3103 	}
3104 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3105 	if (errcode) {
3106 		err = got_error_set_errno(errcode, "pthread_cond_init");
3107 		goto done;
3108 	}
3109 
3110 	s->thread_args.commits_needed = view->nlines;
3111 	s->thread_args.graph = thread_graph;
3112 	s->thread_args.commits = &s->commits;
3113 	s->thread_args.in_repo_path = s->in_repo_path;
3114 	s->thread_args.start_id = s->start_id;
3115 	s->thread_args.repo = thread_repo;
3116 	s->thread_args.log_complete = 0;
3117 	s->thread_args.quit = &s->quit;
3118 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3119 	s->thread_args.selected_entry = &s->selected_entry;
3120 	s->thread_args.searching = &view->searching;
3121 	s->thread_args.search_next_done = &view->search_next_done;
3122 	s->thread_args.regex = &view->regex;
3123 done:
3124 	if (err)
3125 		close_log_view(view);
3126 	return err;
3127 }
3128 
3129 static const struct got_error *
3130 show_log_view(struct tog_view *view)
3131 {
3132 	const struct got_error *err;
3133 	struct tog_log_view_state *s = &view->state.log;
3134 
3135 	if (s->thread == 0) { //NULL) {
3136 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3137 		    &s->thread_args);
3138 		if (errcode)
3139 			return got_error_set_errno(errcode, "pthread_create");
3140 		if (s->thread_args.commits_needed > 0) {
3141 			err = trigger_log_thread(view, 1);
3142 			if (err)
3143 				return err;
3144 		}
3145 	}
3146 
3147 	return draw_commits(view);
3148 }
3149 
3150 static void
3151 log_move_cursor_up(struct tog_view *view, int page, int home)
3152 {
3153 	struct tog_log_view_state *s = &view->state.log;
3154 
3155 	if (s->selected_entry->idx == 0)
3156 		view->count = 0;
3157 	if (s->first_displayed_entry == NULL)
3158 		return;
3159 
3160 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3161 	    || home)
3162 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3163 
3164 	if (!page && !home && s->selected > 0)
3165 		--s->selected;
3166 	else
3167 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3168 
3169 	select_commit(s);
3170 	return;
3171 }
3172 
3173 static const struct got_error *
3174 log_move_cursor_down(struct tog_view *view, int page)
3175 {
3176 	struct tog_log_view_state	*s = &view->state.log;
3177 	const struct got_error		*err = NULL;
3178 	int				 eos = view->nlines - 2;
3179 
3180 	if (s->thread_args.log_complete &&
3181 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3182 		return NULL;
3183 
3184 	if (view_is_hsplit_top(view))
3185 		--eos;  /* border consumes the last line */
3186 
3187 	if (!page) {
3188 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3189 			++s->selected;
3190 		else
3191 			err = log_scroll_down(view, 1);
3192 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3193 		struct commit_queue_entry *entry;
3194 		int n;
3195 
3196 		s->selected = 0;
3197 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3198 		s->last_displayed_entry = entry;
3199 		for (n = 0; n <= eos; n++) {
3200 			if (entry == NULL)
3201 				break;
3202 			s->first_displayed_entry = entry;
3203 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3204 		}
3205 		if (n > 0)
3206 			s->selected = n - 1;
3207 	} else {
3208 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1 &&
3209 		    s->thread_args.log_complete)
3210 			s->selected += MIN(page,
3211 			    s->commits.ncommits - s->selected_entry->idx - 1);
3212 		else
3213 			err = log_scroll_down(view, page);
3214 	}
3215 	if (err)
3216 		return err;
3217 
3218 	/*
3219 	 * We might necessarily overshoot in horizontal
3220 	 * splits; if so, select the last displayed commit.
3221 	 */
3222 	if (s->first_displayed_entry && s->last_displayed_entry) {
3223 		s->selected = MIN(s->selected,
3224 		    s->last_displayed_entry->idx -
3225 		    s->first_displayed_entry->idx);
3226 	}
3227 
3228 	select_commit(s);
3229 
3230 	if (s->thread_args.log_complete &&
3231 	    s->selected_entry->idx == s->commits.ncommits - 1)
3232 		view->count = 0;
3233 
3234 	return NULL;
3235 }
3236 
3237 static void
3238 view_get_split(struct tog_view *view, int *y, int *x)
3239 {
3240 	*x = 0;
3241 	*y = 0;
3242 
3243 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3244 		if (view->child && view->child->resized_y)
3245 			*y = view->child->resized_y;
3246 		else if (view->resized_y)
3247 			*y = view->resized_y;
3248 		else
3249 			*y = view_split_begin_y(view->lines);
3250 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3251 		if (view->child && view->child->resized_x)
3252 			*x = view->child->resized_x;
3253 		else if (view->resized_x)
3254 			*x = view->resized_x;
3255 		else
3256 			*x = view_split_begin_x(view->begin_x);
3257 	}
3258 }
3259 
3260 /* Split view horizontally at y and offset view->state->selected line. */
3261 static const struct got_error *
3262 view_init_hsplit(struct tog_view *view, int y)
3263 {
3264 	const struct got_error *err = NULL;
3265 
3266 	view->nlines = y;
3267 	view->ncols = COLS;
3268 	err = view_resize(view);
3269 	if (err)
3270 		return err;
3271 
3272 	err = offset_selection_down(view);
3273 
3274 	return err;
3275 }
3276 
3277 static const struct got_error *
3278 log_goto_line(struct tog_view *view, int nlines)
3279 {
3280 	const struct got_error		*err = NULL;
3281 	struct tog_log_view_state	*s = &view->state.log;
3282 	int				 g, idx = s->selected_entry->idx;
3283 
3284 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3285 		return NULL;
3286 
3287 	g = view->gline;
3288 	view->gline = 0;
3289 
3290 	if (g >= s->first_displayed_entry->idx + 1 &&
3291 	    g <= s->last_displayed_entry->idx + 1 &&
3292 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3293 		s->selected = g - s->first_displayed_entry->idx - 1;
3294 		select_commit(s);
3295 		return NULL;
3296 	}
3297 
3298 	if (idx + 1 < g) {
3299 		err = log_move_cursor_down(view, g - idx - 1);
3300 		if (!err && g > s->selected_entry->idx + 1)
3301 			err = log_move_cursor_down(view,
3302 			    g - s->first_displayed_entry->idx - 1);
3303 		if (err)
3304 			return err;
3305 	} else if (idx + 1 > g)
3306 		log_move_cursor_up(view, idx - g + 1, 0);
3307 
3308 	if (g < nlines && s->first_displayed_entry->idx == 0)
3309 		s->selected = g - 1;
3310 
3311 	select_commit(s);
3312 	return NULL;
3313 
3314 }
3315 
3316 static const struct got_error *
3317 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3318 {
3319 	const struct got_error *err = NULL;
3320 	struct tog_log_view_state *s = &view->state.log;
3321 	int eos, nscroll;
3322 
3323 	if (s->thread_args.load_all) {
3324 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3325 			s->thread_args.load_all = 0;
3326 		else if (s->thread_args.log_complete) {
3327 			err = log_move_cursor_down(view, s->commits.ncommits);
3328 			s->thread_args.load_all = 0;
3329 		}
3330 		if (err)
3331 			return err;
3332 	}
3333 
3334 	eos = nscroll = view->nlines - 1;
3335 	if (view_is_hsplit_top(view))
3336 		--eos;  /* border */
3337 
3338 	if (view->gline)
3339 		return log_goto_line(view, eos);
3340 
3341 	switch (ch) {
3342 	case 'q':
3343 		s->quit = 1;
3344 		break;
3345 	case '0':
3346 		view->x = 0;
3347 		break;
3348 	case '$':
3349 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3350 		view->count = 0;
3351 		break;
3352 	case KEY_RIGHT:
3353 	case 'l':
3354 		if (view->x + view->ncols / 2 < view->maxx)
3355 			view->x += 2;  /* move two columns right */
3356 		else
3357 			view->count = 0;
3358 		break;
3359 	case KEY_LEFT:
3360 	case 'h':
3361 		view->x -= MIN(view->x, 2);  /* move two columns back */
3362 		if (view->x <= 0)
3363 			view->count = 0;
3364 		break;
3365 	case 'k':
3366 	case KEY_UP:
3367 	case '<':
3368 	case ',':
3369 	case CTRL('p'):
3370 		log_move_cursor_up(view, 0, 0);
3371 		break;
3372 	case 'g':
3373 	case KEY_HOME:
3374 		log_move_cursor_up(view, 0, 1);
3375 		view->count = 0;
3376 		break;
3377 	case CTRL('u'):
3378 	case 'u':
3379 		nscroll /= 2;
3380 		/* FALL THROUGH */
3381 	case KEY_PPAGE:
3382 	case CTRL('b'):
3383 	case 'b':
3384 		log_move_cursor_up(view, nscroll, 0);
3385 		break;
3386 	case 'j':
3387 	case KEY_DOWN:
3388 	case '>':
3389 	case '.':
3390 	case CTRL('n'):
3391 		err = log_move_cursor_down(view, 0);
3392 		break;
3393 	case '@':
3394 		s->use_committer = !s->use_committer;
3395 		break;
3396 	case 'G':
3397 	case KEY_END: {
3398 		/* We don't know yet how many commits, so we're forced to
3399 		 * traverse them all. */
3400 		view->count = 0;
3401 		s->thread_args.load_all = 1;
3402 		if (!s->thread_args.log_complete)
3403 			return trigger_log_thread(view, 0);
3404 		err = log_move_cursor_down(view, s->commits.ncommits);
3405 		s->thread_args.load_all = 0;
3406 		break;
3407 	}
3408 	case CTRL('d'):
3409 	case 'd':
3410 		nscroll /= 2;
3411 		/* FALL THROUGH */
3412 	case KEY_NPAGE:
3413 	case CTRL('f'):
3414 	case 'f':
3415 	case ' ':
3416 		err = log_move_cursor_down(view, nscroll);
3417 		break;
3418 	case KEY_RESIZE:
3419 		if (s->selected > view->nlines - 2)
3420 			s->selected = view->nlines - 2;
3421 		if (s->selected > s->commits.ncommits - 1)
3422 			s->selected = s->commits.ncommits - 1;
3423 		select_commit(s);
3424 		if (s->commits.ncommits < view->nlines - 1 &&
3425 		    !s->thread_args.log_complete) {
3426 			s->thread_args.commits_needed += (view->nlines - 1) -
3427 			    s->commits.ncommits;
3428 			err = trigger_log_thread(view, 1);
3429 		}
3430 		break;
3431 	case KEY_ENTER:
3432 	case '\r':
3433 		view->count = 0;
3434 		if (s->selected_entry == NULL)
3435 			break;
3436 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3437 		break;
3438 	case 'T':
3439 		view->count = 0;
3440 		if (s->selected_entry == NULL)
3441 			break;
3442 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3443 		break;
3444 	case KEY_BACKSPACE:
3445 	case CTRL('l'):
3446 	case 'B':
3447 		view->count = 0;
3448 		if (ch == KEY_BACKSPACE &&
3449 		    got_path_is_root_dir(s->in_repo_path))
3450 			break;
3451 		err = stop_log_thread(s);
3452 		if (err)
3453 			return err;
3454 		if (ch == KEY_BACKSPACE) {
3455 			char *parent_path;
3456 			err = got_path_dirname(&parent_path, s->in_repo_path);
3457 			if (err)
3458 				return err;
3459 			free(s->in_repo_path);
3460 			s->in_repo_path = parent_path;
3461 			s->thread_args.in_repo_path = s->in_repo_path;
3462 		} else if (ch == CTRL('l')) {
3463 			struct got_object_id *start_id;
3464 			err = got_repo_match_object_id(&start_id, NULL,
3465 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3466 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3467 			if (err)
3468 				return err;
3469 			free(s->start_id);
3470 			s->start_id = start_id;
3471 			s->thread_args.start_id = s->start_id;
3472 		} else /* 'B' */
3473 			s->log_branches = !s->log_branches;
3474 
3475 		if (s->thread_args.pack_fds == NULL) {
3476 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3477 			if (err)
3478 				return err;
3479 		}
3480 		err = got_repo_open(&s->thread_args.repo,
3481 		    got_repo_get_path(s->repo), NULL,
3482 		    s->thread_args.pack_fds);
3483 		if (err)
3484 			return err;
3485 		tog_free_refs();
3486 		err = tog_load_refs(s->repo, 0);
3487 		if (err)
3488 			return err;
3489 		err = got_commit_graph_open(&s->thread_args.graph,
3490 		    s->in_repo_path, !s->log_branches);
3491 		if (err)
3492 			return err;
3493 		err = got_commit_graph_iter_start(s->thread_args.graph,
3494 		    s->start_id, s->repo, NULL, NULL);
3495 		if (err)
3496 			return err;
3497 		free_commits(&s->commits);
3498 		s->first_displayed_entry = NULL;
3499 		s->last_displayed_entry = NULL;
3500 		s->selected_entry = NULL;
3501 		s->selected = 0;
3502 		s->thread_args.log_complete = 0;
3503 		s->quit = 0;
3504 		s->thread_args.commits_needed = view->lines;
3505 		s->matched_entry = NULL;
3506 		s->search_entry = NULL;
3507 		view->offset = 0;
3508 		break;
3509 	case 'R':
3510 		view->count = 0;
3511 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3512 		break;
3513 	default:
3514 		view->count = 0;
3515 		break;
3516 	}
3517 
3518 	return err;
3519 }
3520 
3521 static const struct got_error *
3522 apply_unveil(const char *repo_path, const char *worktree_path)
3523 {
3524 	const struct got_error *error;
3525 
3526 #ifdef PROFILE
3527 	if (unveil("gmon.out", "rwc") != 0)
3528 		return got_error_from_errno2("unveil", "gmon.out");
3529 #endif
3530 	if (repo_path && unveil(repo_path, "r") != 0)
3531 		return got_error_from_errno2("unveil", repo_path);
3532 
3533 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3534 		return got_error_from_errno2("unveil", worktree_path);
3535 
3536 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3537 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3538 
3539 	error = got_privsep_unveil_exec_helpers();
3540 	if (error != NULL)
3541 		return error;
3542 
3543 	if (unveil(NULL, NULL) != 0)
3544 		return got_error_from_errno("unveil");
3545 
3546 	return NULL;
3547 }
3548 
3549 static void
3550 init_curses(void)
3551 {
3552 	/*
3553 	 * Override default signal handlers before starting ncurses.
3554 	 * This should prevent ncurses from installing its own
3555 	 * broken cleanup() signal handler.
3556 	 */
3557 	signal(SIGWINCH, tog_sigwinch);
3558 	signal(SIGPIPE, tog_sigpipe);
3559 	signal(SIGCONT, tog_sigcont);
3560 	signal(SIGINT, tog_sigint);
3561 	signal(SIGTERM, tog_sigterm);
3562 
3563 	initscr();
3564 	cbreak();
3565 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3566 	noecho();
3567 	nonl();
3568 	intrflush(stdscr, FALSE);
3569 	keypad(stdscr, TRUE);
3570 	curs_set(0);
3571 	if (getenv("TOG_COLORS") != NULL) {
3572 		start_color();
3573 		use_default_colors();
3574 	}
3575 }
3576 
3577 static const struct got_error *
3578 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3579     struct got_repository *repo, struct got_worktree *worktree)
3580 {
3581 	const struct got_error *err = NULL;
3582 
3583 	if (argc == 0) {
3584 		*in_repo_path = strdup("/");
3585 		if (*in_repo_path == NULL)
3586 			return got_error_from_errno("strdup");
3587 		return NULL;
3588 	}
3589 
3590 	if (worktree) {
3591 		const char *prefix = got_worktree_get_path_prefix(worktree);
3592 		char *p;
3593 
3594 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3595 		if (err)
3596 			return err;
3597 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3598 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3599 		    p) == -1) {
3600 			err = got_error_from_errno("asprintf");
3601 			*in_repo_path = NULL;
3602 		}
3603 		free(p);
3604 	} else
3605 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3606 
3607 	return err;
3608 }
3609 
3610 static const struct got_error *
3611 cmd_log(int argc, char *argv[])
3612 {
3613 	const struct got_error *error;
3614 	struct got_repository *repo = NULL;
3615 	struct got_worktree *worktree = NULL;
3616 	struct got_object_id *start_id = NULL;
3617 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3618 	char *start_commit = NULL, *label = NULL;
3619 	struct got_reference *ref = NULL;
3620 	const char *head_ref_name = NULL;
3621 	int ch, log_branches = 0;
3622 	struct tog_view *view;
3623 	int *pack_fds = NULL;
3624 
3625 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3626 		switch (ch) {
3627 		case 'b':
3628 			log_branches = 1;
3629 			break;
3630 		case 'c':
3631 			start_commit = optarg;
3632 			break;
3633 		case 'r':
3634 			repo_path = realpath(optarg, NULL);
3635 			if (repo_path == NULL)
3636 				return got_error_from_errno2("realpath",
3637 				    optarg);
3638 			break;
3639 		default:
3640 			usage_log();
3641 			/* NOTREACHED */
3642 		}
3643 	}
3644 
3645 	argc -= optind;
3646 	argv += optind;
3647 
3648 	if (argc > 1)
3649 		usage_log();
3650 
3651 	error = got_repo_pack_fds_open(&pack_fds);
3652 	if (error != NULL)
3653 		goto done;
3654 
3655 	if (repo_path == NULL) {
3656 		cwd = getcwd(NULL, 0);
3657 		if (cwd == NULL)
3658 			return got_error_from_errno("getcwd");
3659 		error = got_worktree_open(&worktree, cwd);
3660 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3661 			goto done;
3662 		if (worktree)
3663 			repo_path =
3664 			    strdup(got_worktree_get_repo_path(worktree));
3665 		else
3666 			repo_path = strdup(cwd);
3667 		if (repo_path == NULL) {
3668 			error = got_error_from_errno("strdup");
3669 			goto done;
3670 		}
3671 	}
3672 
3673 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3674 	if (error != NULL)
3675 		goto done;
3676 
3677 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3678 	    repo, worktree);
3679 	if (error)
3680 		goto done;
3681 
3682 	init_curses();
3683 
3684 	error = apply_unveil(got_repo_get_path(repo),
3685 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3686 	if (error)
3687 		goto done;
3688 
3689 	/* already loaded by tog_log_with_path()? */
3690 	if (TAILQ_EMPTY(&tog_refs)) {
3691 		error = tog_load_refs(repo, 0);
3692 		if (error)
3693 			goto done;
3694 	}
3695 
3696 	if (start_commit == NULL) {
3697 		error = got_repo_match_object_id(&start_id, &label,
3698 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3699 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3700 		if (error)
3701 			goto done;
3702 		head_ref_name = label;
3703 	} else {
3704 		error = got_ref_open(&ref, repo, start_commit, 0);
3705 		if (error == NULL)
3706 			head_ref_name = got_ref_get_name(ref);
3707 		else if (error->code != GOT_ERR_NOT_REF)
3708 			goto done;
3709 		error = got_repo_match_object_id(&start_id, NULL,
3710 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3711 		if (error)
3712 			goto done;
3713 	}
3714 
3715 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3716 	if (view == NULL) {
3717 		error = got_error_from_errno("view_open");
3718 		goto done;
3719 	}
3720 	error = open_log_view(view, start_id, repo, head_ref_name,
3721 	    in_repo_path, log_branches);
3722 	if (error)
3723 		goto done;
3724 	if (worktree) {
3725 		/* Release work tree lock. */
3726 		got_worktree_close(worktree);
3727 		worktree = NULL;
3728 	}
3729 	error = view_loop(view);
3730 done:
3731 	free(in_repo_path);
3732 	free(repo_path);
3733 	free(cwd);
3734 	free(start_id);
3735 	free(label);
3736 	if (ref)
3737 		got_ref_close(ref);
3738 	if (repo) {
3739 		const struct got_error *close_err = got_repo_close(repo);
3740 		if (error == NULL)
3741 			error = close_err;
3742 	}
3743 	if (worktree)
3744 		got_worktree_close(worktree);
3745 	if (pack_fds) {
3746 		const struct got_error *pack_err =
3747 		    got_repo_pack_fds_close(pack_fds);
3748 		if (error == NULL)
3749 			error = pack_err;
3750 	}
3751 	tog_free_refs();
3752 	return error;
3753 }
3754 
3755 __dead static void
3756 usage_diff(void)
3757 {
3758 	endwin();
3759 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
3760 	    "object1 object2\n", getprogname());
3761 	exit(1);
3762 }
3763 
3764 static int
3765 match_line(const char *line, regex_t *regex, size_t nmatch,
3766     regmatch_t *regmatch)
3767 {
3768 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3769 }
3770 
3771 static struct tog_color *
3772 match_color(struct tog_colors *colors, const char *line)
3773 {
3774 	struct tog_color *tc = NULL;
3775 
3776 	STAILQ_FOREACH(tc, colors, entry) {
3777 		if (match_line(line, &tc->regex, 0, NULL))
3778 			return tc;
3779 	}
3780 
3781 	return NULL;
3782 }
3783 
3784 static const struct got_error *
3785 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3786     WINDOW *window, int skipcol, regmatch_t *regmatch)
3787 {
3788 	const struct got_error *err = NULL;
3789 	char *exstr = NULL;
3790 	wchar_t *wline = NULL;
3791 	int rme, rms, n, width, scrollx;
3792 	int width0 = 0, width1 = 0, width2 = 0;
3793 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3794 
3795 	*wtotal = 0;
3796 
3797 	rms = regmatch->rm_so;
3798 	rme = regmatch->rm_eo;
3799 
3800 	err = expand_tab(&exstr, line);
3801 	if (err)
3802 		return err;
3803 
3804 	/* Split the line into 3 segments, according to match offsets. */
3805 	seg0 = strndup(exstr, rms);
3806 	if (seg0 == NULL) {
3807 		err = got_error_from_errno("strndup");
3808 		goto done;
3809 	}
3810 	seg1 = strndup(exstr + rms, rme - rms);
3811 	if (seg1 == NULL) {
3812 		err = got_error_from_errno("strndup");
3813 		goto done;
3814 	}
3815 	seg2 = strdup(exstr + rme);
3816 	if (seg2 == NULL) {
3817 		err = got_error_from_errno("strndup");
3818 		goto done;
3819 	}
3820 
3821 	/* draw up to matched token if we haven't scrolled past it */
3822 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3823 	    col_tab_align, 1);
3824 	if (err)
3825 		goto done;
3826 	n = MAX(width0 - skipcol, 0);
3827 	if (n) {
3828 		free(wline);
3829 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3830 		    wlimit, col_tab_align, 1);
3831 		if (err)
3832 			goto done;
3833 		waddwstr(window, &wline[scrollx]);
3834 		wlimit -= width;
3835 		*wtotal += width;
3836 	}
3837 
3838 	if (wlimit > 0) {
3839 		int i = 0, w = 0;
3840 		size_t wlen;
3841 
3842 		free(wline);
3843 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3844 		    col_tab_align, 1);
3845 		if (err)
3846 			goto done;
3847 		wlen = wcslen(wline);
3848 		while (i < wlen) {
3849 			width = wcwidth(wline[i]);
3850 			if (width == -1) {
3851 				/* should not happen, tabs are expanded */
3852 				err = got_error(GOT_ERR_RANGE);
3853 				goto done;
3854 			}
3855 			if (width0 + w + width > skipcol)
3856 				break;
3857 			w += width;
3858 			i++;
3859 		}
3860 		/* draw (visible part of) matched token (if scrolled into it) */
3861 		if (width1 - w > 0) {
3862 			wattron(window, A_STANDOUT);
3863 			waddwstr(window, &wline[i]);
3864 			wattroff(window, A_STANDOUT);
3865 			wlimit -= (width1 - w);
3866 			*wtotal += (width1 - w);
3867 		}
3868 	}
3869 
3870 	if (wlimit > 0) {  /* draw rest of line */
3871 		free(wline);
3872 		if (skipcol > width0 + width1) {
3873 			err = format_line(&wline, &width2, &scrollx, seg2,
3874 			    skipcol - (width0 + width1), wlimit,
3875 			    col_tab_align, 1);
3876 			if (err)
3877 				goto done;
3878 			waddwstr(window, &wline[scrollx]);
3879 		} else {
3880 			err = format_line(&wline, &width2, NULL, seg2, 0,
3881 			    wlimit, col_tab_align, 1);
3882 			if (err)
3883 				goto done;
3884 			waddwstr(window, wline);
3885 		}
3886 		*wtotal += width2;
3887 	}
3888 done:
3889 	free(wline);
3890 	free(exstr);
3891 	free(seg0);
3892 	free(seg1);
3893 	free(seg2);
3894 	return err;
3895 }
3896 
3897 static int
3898 gotoline(struct tog_view *view, int *lineno, int *nprinted)
3899 {
3900 	FILE	*f = NULL;
3901 	int	*eof, *first, *selected;
3902 
3903 	if (view->type == TOG_VIEW_DIFF) {
3904 		struct tog_diff_view_state *s = &view->state.diff;
3905 
3906 		first = &s->first_displayed_line;
3907 		selected = first;
3908 		eof = &s->eof;
3909 		f = s->f;
3910 	} else if (view->type == TOG_VIEW_BLAME) {
3911 		struct tog_blame_view_state *s = &view->state.blame;
3912 
3913 		first = &s->first_displayed_line;
3914 		selected = &s->selected_line;
3915 		eof = &s->eof;
3916 		f = s->blame.f;
3917 	} else
3918 		return 0;
3919 
3920 	/* Center gline in the middle of the page like vi(1). */
3921 	if (*lineno < view->gline - (view->nlines - 3) / 2)
3922 		return 0;
3923 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
3924 		rewind(f);
3925 		*eof = 0;
3926 		*first = 1;
3927 		*lineno = 0;
3928 		*nprinted = 0;
3929 		return 0;
3930 	}
3931 
3932 	*selected = view->gline <= (view->nlines - 3) / 2 ?
3933 		view->gline : (view->nlines - 3) / 2 + 1;
3934 	view->gline = 0;
3935 
3936 	return 1;
3937 }
3938 
3939 static const struct got_error *
3940 draw_file(struct tog_view *view, const char *header)
3941 {
3942 	struct tog_diff_view_state *s = &view->state.diff;
3943 	regmatch_t *regmatch = &view->regmatch;
3944 	const struct got_error *err;
3945 	int nprinted = 0;
3946 	char *line;
3947 	size_t linesize = 0;
3948 	ssize_t linelen;
3949 	wchar_t *wline;
3950 	int width;
3951 	int max_lines = view->nlines;
3952 	int nlines = s->nlines;
3953 	off_t line_offset;
3954 
3955 	s->lineno = s->first_displayed_line - 1;
3956 	line_offset = s->lines[s->first_displayed_line - 1].offset;
3957 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3958 		return got_error_from_errno("fseek");
3959 
3960 	werase(view->window);
3961 
3962 	if (view->gline > s->nlines - 1)
3963 		view->gline = s->nlines - 1;
3964 
3965 	if (header) {
3966 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
3967 		    1 : view->gline - (view->nlines - 3) / 2 :
3968 		    s->lineno + s->selected_line;
3969 
3970 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
3971 			return got_error_from_errno("asprintf");
3972 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3973 		    0, 0);
3974 		free(line);
3975 		if (err)
3976 			return err;
3977 
3978 		if (view_needs_focus_indication(view))
3979 			wstandout(view->window);
3980 		waddwstr(view->window, wline);
3981 		free(wline);
3982 		wline = NULL;
3983 		while (width++ < view->ncols)
3984 			waddch(view->window, ' ');
3985 		if (view_needs_focus_indication(view))
3986 			wstandend(view->window);
3987 
3988 		if (max_lines <= 1)
3989 			return NULL;
3990 		max_lines--;
3991 	}
3992 
3993 	s->eof = 0;
3994 	view->maxx = 0;
3995 	line = NULL;
3996 	while (max_lines > 0 && nprinted < max_lines) {
3997 		enum got_diff_line_type linetype;
3998 		attr_t attr = 0;
3999 
4000 		linelen = getline(&line, &linesize, s->f);
4001 		if (linelen == -1) {
4002 			if (feof(s->f)) {
4003 				s->eof = 1;
4004 				break;
4005 			}
4006 			free(line);
4007 			return got_ferror(s->f, GOT_ERR_IO);
4008 		}
4009 
4010 		if (++s->lineno < s->first_displayed_line)
4011 			continue;
4012 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4013 			continue;
4014 		if (s->lineno == view->hiline)
4015 			attr = A_STANDOUT;
4016 
4017 		/* Set view->maxx based on full line length. */
4018 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4019 		    view->x ? 1 : 0);
4020 		if (err) {
4021 			free(line);
4022 			return err;
4023 		}
4024 		view->maxx = MAX(view->maxx, width);
4025 		free(wline);
4026 		wline = NULL;
4027 
4028 		linetype = s->lines[s->lineno].type;
4029 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4030 		    linetype < GOT_DIFF_LINE_CONTEXT)
4031 			attr |= COLOR_PAIR(linetype);
4032 		if (attr)
4033 			wattron(view->window, attr);
4034 		if (s->first_displayed_line + nprinted == s->matched_line &&
4035 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4036 			err = add_matched_line(&width, line, view->ncols, 0,
4037 			    view->window, view->x, regmatch);
4038 			if (err) {
4039 				free(line);
4040 				return err;
4041 			}
4042 		} else {
4043 			int skip;
4044 			err = format_line(&wline, &width, &skip, line,
4045 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4046 			if (err) {
4047 				free(line);
4048 				return err;
4049 			}
4050 			waddwstr(view->window, &wline[skip]);
4051 			free(wline);
4052 			wline = NULL;
4053 		}
4054 		if (s->lineno == view->hiline) {
4055 			/* highlight full gline length */
4056 			while (width++ < view->ncols)
4057 				waddch(view->window, ' ');
4058 		} else {
4059 			if (width <= view->ncols - 1)
4060 				waddch(view->window, '\n');
4061 		}
4062 		if (attr)
4063 			wattroff(view->window, attr);
4064 		if (++nprinted == 1)
4065 			s->first_displayed_line = s->lineno;
4066 	}
4067 	free(line);
4068 	if (nprinted >= 1)
4069 		s->last_displayed_line = s->first_displayed_line +
4070 		    (nprinted - 1);
4071 	else
4072 		s->last_displayed_line = s->first_displayed_line;
4073 
4074 	view_border(view);
4075 
4076 	if (s->eof) {
4077 		while (nprinted < view->nlines) {
4078 			waddch(view->window, '\n');
4079 			nprinted++;
4080 		}
4081 
4082 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4083 		    view->ncols, 0, 0);
4084 		if (err) {
4085 			return err;
4086 		}
4087 
4088 		wstandout(view->window);
4089 		waddwstr(view->window, wline);
4090 		free(wline);
4091 		wline = NULL;
4092 		wstandend(view->window);
4093 	}
4094 
4095 	return NULL;
4096 }
4097 
4098 static char *
4099 get_datestr(time_t *time, char *datebuf)
4100 {
4101 	struct tm mytm, *tm;
4102 	char *p, *s;
4103 
4104 	tm = gmtime_r(time, &mytm);
4105 	if (tm == NULL)
4106 		return NULL;
4107 	s = asctime_r(tm, datebuf);
4108 	if (s == NULL)
4109 		return NULL;
4110 	p = strchr(s, '\n');
4111 	if (p)
4112 		*p = '\0';
4113 	return s;
4114 }
4115 
4116 static const struct got_error *
4117 get_changed_paths(struct got_pathlist_head *paths,
4118     struct got_commit_object *commit, struct got_repository *repo)
4119 {
4120 	const struct got_error *err = NULL;
4121 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4122 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4123 	struct got_object_qid *qid;
4124 
4125 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4126 	if (qid != NULL) {
4127 		struct got_commit_object *pcommit;
4128 		err = got_object_open_as_commit(&pcommit, repo,
4129 		    &qid->id);
4130 		if (err)
4131 			return err;
4132 
4133 		tree_id1 = got_object_id_dup(
4134 		    got_object_commit_get_tree_id(pcommit));
4135 		if (tree_id1 == NULL) {
4136 			got_object_commit_close(pcommit);
4137 			return got_error_from_errno("got_object_id_dup");
4138 		}
4139 		got_object_commit_close(pcommit);
4140 
4141 	}
4142 
4143 	if (tree_id1) {
4144 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4145 		if (err)
4146 			goto done;
4147 	}
4148 
4149 	tree_id2 = got_object_commit_get_tree_id(commit);
4150 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4151 	if (err)
4152 		goto done;
4153 
4154 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4155 	    got_diff_tree_collect_changed_paths, paths, 0);
4156 done:
4157 	if (tree1)
4158 		got_object_tree_close(tree1);
4159 	if (tree2)
4160 		got_object_tree_close(tree2);
4161 	free(tree_id1);
4162 	return err;
4163 }
4164 
4165 static const struct got_error *
4166 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4167     off_t off, uint8_t type)
4168 {
4169 	struct got_diff_line *p;
4170 
4171 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4172 	if (p == NULL)
4173 		return got_error_from_errno("reallocarray");
4174 	*lines = p;
4175 	(*lines)[*nlines].offset = off;
4176 	(*lines)[*nlines].type = type;
4177 	(*nlines)++;
4178 
4179 	return NULL;
4180 }
4181 
4182 static const struct got_error *
4183 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4184     struct got_object_id *commit_id, struct got_reflist_head *refs,
4185     struct got_repository *repo, FILE *outfile)
4186 {
4187 	const struct got_error *err = NULL;
4188 	char datebuf[26], *datestr;
4189 	struct got_commit_object *commit;
4190 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4191 	time_t committer_time;
4192 	const char *author, *committer;
4193 	char *refs_str = NULL;
4194 	struct got_pathlist_head changed_paths;
4195 	struct got_pathlist_entry *pe;
4196 	off_t outoff = 0;
4197 	int n;
4198 
4199 	TAILQ_INIT(&changed_paths);
4200 
4201 	if (refs) {
4202 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4203 		if (err)
4204 			return err;
4205 	}
4206 
4207 	err = got_object_open_as_commit(&commit, repo, commit_id);
4208 	if (err)
4209 		return err;
4210 
4211 	err = got_object_id_str(&id_str, commit_id);
4212 	if (err) {
4213 		err = got_error_from_errno("got_object_id_str");
4214 		goto done;
4215 	}
4216 
4217 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4218 	if (err)
4219 		goto done;
4220 
4221 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4222 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4223 	if (n < 0) {
4224 		err = got_error_from_errno("fprintf");
4225 		goto done;
4226 	}
4227 	outoff += n;
4228 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4229 	if (err)
4230 		goto done;
4231 
4232 	n = fprintf(outfile, "from: %s\n",
4233 	    got_object_commit_get_author(commit));
4234 	if (n < 0) {
4235 		err = got_error_from_errno("fprintf");
4236 		goto done;
4237 	}
4238 	outoff += n;
4239 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4240 	if (err)
4241 		goto done;
4242 
4243 	committer_time = got_object_commit_get_committer_time(commit);
4244 	datestr = get_datestr(&committer_time, datebuf);
4245 	if (datestr) {
4246 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4247 		if (n < 0) {
4248 			err = got_error_from_errno("fprintf");
4249 			goto done;
4250 		}
4251 		outoff += n;
4252 		err = add_line_metadata(lines, nlines, outoff,
4253 		    GOT_DIFF_LINE_DATE);
4254 		if (err)
4255 			goto done;
4256 	}
4257 	author = got_object_commit_get_author(commit);
4258 	committer = got_object_commit_get_committer(commit);
4259 	if (strcmp(author, committer) != 0) {
4260 		n = fprintf(outfile, "via: %s\n", committer);
4261 		if (n < 0) {
4262 			err = got_error_from_errno("fprintf");
4263 			goto done;
4264 		}
4265 		outoff += n;
4266 		err = add_line_metadata(lines, nlines, outoff,
4267 		    GOT_DIFF_LINE_AUTHOR);
4268 		if (err)
4269 			goto done;
4270 	}
4271 	if (got_object_commit_get_nparents(commit) > 1) {
4272 		const struct got_object_id_queue *parent_ids;
4273 		struct got_object_qid *qid;
4274 		int pn = 1;
4275 		parent_ids = got_object_commit_get_parent_ids(commit);
4276 		STAILQ_FOREACH(qid, parent_ids, entry) {
4277 			err = got_object_id_str(&id_str, &qid->id);
4278 			if (err)
4279 				goto done;
4280 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4281 			if (n < 0) {
4282 				err = got_error_from_errno("fprintf");
4283 				goto done;
4284 			}
4285 			outoff += n;
4286 			err = add_line_metadata(lines, nlines, outoff,
4287 			    GOT_DIFF_LINE_META);
4288 			if (err)
4289 				goto done;
4290 			free(id_str);
4291 			id_str = NULL;
4292 		}
4293 	}
4294 
4295 	err = got_object_commit_get_logmsg(&logmsg, commit);
4296 	if (err)
4297 		goto done;
4298 	s = logmsg;
4299 	while ((line = strsep(&s, "\n")) != NULL) {
4300 		n = fprintf(outfile, "%s\n", line);
4301 		if (n < 0) {
4302 			err = got_error_from_errno("fprintf");
4303 			goto done;
4304 		}
4305 		outoff += n;
4306 		err = add_line_metadata(lines, nlines, outoff,
4307 		    GOT_DIFF_LINE_LOGMSG);
4308 		if (err)
4309 			goto done;
4310 	}
4311 
4312 	err = get_changed_paths(&changed_paths, commit, repo);
4313 	if (err)
4314 		goto done;
4315 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4316 		struct got_diff_changed_path *cp = pe->data;
4317 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4318 		if (n < 0) {
4319 			err = got_error_from_errno("fprintf");
4320 			goto done;
4321 		}
4322 		outoff += n;
4323 		err = add_line_metadata(lines, nlines, outoff,
4324 		    GOT_DIFF_LINE_CHANGES);
4325 		if (err)
4326 			goto done;
4327 		free((char *)pe->path);
4328 		free(pe->data);
4329 	}
4330 
4331 	fputc('\n', outfile);
4332 	outoff++;
4333 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4334 done:
4335 	got_pathlist_free(&changed_paths);
4336 	free(id_str);
4337 	free(logmsg);
4338 	free(refs_str);
4339 	got_object_commit_close(commit);
4340 	if (err) {
4341 		free(*lines);
4342 		*lines = NULL;
4343 		*nlines = 0;
4344 	}
4345 	return err;
4346 }
4347 
4348 static const struct got_error *
4349 create_diff(struct tog_diff_view_state *s)
4350 {
4351 	const struct got_error *err = NULL;
4352 	FILE *f = NULL;
4353 	int obj_type;
4354 
4355 	free(s->lines);
4356 	s->lines = malloc(sizeof(*s->lines));
4357 	if (s->lines == NULL)
4358 		return got_error_from_errno("malloc");
4359 	s->nlines = 0;
4360 
4361 	f = got_opentemp();
4362 	if (f == NULL) {
4363 		err = got_error_from_errno("got_opentemp");
4364 		goto done;
4365 	}
4366 	if (s->f && fclose(s->f) == EOF) {
4367 		err = got_error_from_errno("fclose");
4368 		goto done;
4369 	}
4370 	s->f = f;
4371 
4372 	if (s->id1)
4373 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4374 	else
4375 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4376 	if (err)
4377 		goto done;
4378 
4379 	switch (obj_type) {
4380 	case GOT_OBJ_TYPE_BLOB:
4381 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4382 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4383 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4384 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4385 		break;
4386 	case GOT_OBJ_TYPE_TREE:
4387 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4388 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4389 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4390 		    s->force_text_diff, s->repo, s->f);
4391 		break;
4392 	case GOT_OBJ_TYPE_COMMIT: {
4393 		const struct got_object_id_queue *parent_ids;
4394 		struct got_object_qid *pid;
4395 		struct got_commit_object *commit2;
4396 		struct got_reflist_head *refs;
4397 
4398 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4399 		if (err)
4400 			goto done;
4401 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4402 		/* Show commit info if we're diffing to a parent/root commit. */
4403 		if (s->id1 == NULL) {
4404 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4405 			    refs, s->repo, s->f);
4406 			if (err)
4407 				goto done;
4408 		} else {
4409 			parent_ids = got_object_commit_get_parent_ids(commit2);
4410 			STAILQ_FOREACH(pid, parent_ids, entry) {
4411 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4412 					err = write_commit_info(&s->lines,
4413 					    &s->nlines, s->id2, refs, s->repo,
4414 					    s->f);
4415 					if (err)
4416 						goto done;
4417 					break;
4418 				}
4419 			}
4420 		}
4421 		got_object_commit_close(commit2);
4422 
4423 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4424 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4425 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4426 		    s->force_text_diff, s->repo, s->f);
4427 		break;
4428 	}
4429 	default:
4430 		err = got_error(GOT_ERR_OBJ_TYPE);
4431 		break;
4432 	}
4433 done:
4434 	if (s->f && fflush(s->f) != 0 && err == NULL)
4435 		err = got_error_from_errno("fflush");
4436 	return err;
4437 }
4438 
4439 static void
4440 diff_view_indicate_progress(struct tog_view *view)
4441 {
4442 	mvwaddstr(view->window, 0, 0, "diffing...");
4443 	update_panels();
4444 	doupdate();
4445 }
4446 
4447 static const struct got_error *
4448 search_start_diff_view(struct tog_view *view)
4449 {
4450 	struct tog_diff_view_state *s = &view->state.diff;
4451 
4452 	s->matched_line = 0;
4453 	return NULL;
4454 }
4455 
4456 static const struct got_error *
4457 search_next_diff_view(struct tog_view *view)
4458 {
4459 	struct tog_diff_view_state *s = &view->state.diff;
4460 	const struct got_error *err = NULL;
4461 	int lineno;
4462 	char *line = NULL;
4463 	size_t linesize = 0;
4464 	ssize_t linelen;
4465 
4466 	if (!view->searching) {
4467 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4468 		return NULL;
4469 	}
4470 
4471 	if (s->matched_line) {
4472 		if (view->searching == TOG_SEARCH_FORWARD)
4473 			lineno = s->matched_line + 1;
4474 		else
4475 			lineno = s->matched_line - 1;
4476 	} else
4477 		lineno = s->first_displayed_line;
4478 
4479 	while (1) {
4480 		off_t offset;
4481 
4482 		if (lineno <= 0 || lineno > s->nlines) {
4483 			if (s->matched_line == 0) {
4484 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4485 				break;
4486 			}
4487 
4488 			if (view->searching == TOG_SEARCH_FORWARD)
4489 				lineno = 1;
4490 			else
4491 				lineno = s->nlines;
4492 		}
4493 
4494 		offset = s->lines[lineno - 1].offset;
4495 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4496 			free(line);
4497 			return got_error_from_errno("fseeko");
4498 		}
4499 		linelen = getline(&line, &linesize, s->f);
4500 		if (linelen != -1) {
4501 			char *exstr;
4502 			err = expand_tab(&exstr, line);
4503 			if (err)
4504 				break;
4505 			if (match_line(exstr, &view->regex, 1,
4506 			    &view->regmatch)) {
4507 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4508 				s->matched_line = lineno;
4509 				free(exstr);
4510 				break;
4511 			}
4512 			free(exstr);
4513 		}
4514 		if (view->searching == TOG_SEARCH_FORWARD)
4515 			lineno++;
4516 		else
4517 			lineno--;
4518 	}
4519 	free(line);
4520 
4521 	if (s->matched_line) {
4522 		s->first_displayed_line = s->matched_line;
4523 		s->selected_line = 1;
4524 	}
4525 
4526 	return err;
4527 }
4528 
4529 static const struct got_error *
4530 close_diff_view(struct tog_view *view)
4531 {
4532 	const struct got_error *err = NULL;
4533 	struct tog_diff_view_state *s = &view->state.diff;
4534 
4535 	free(s->id1);
4536 	s->id1 = NULL;
4537 	free(s->id2);
4538 	s->id2 = NULL;
4539 	if (s->f && fclose(s->f) == EOF)
4540 		err = got_error_from_errno("fclose");
4541 	s->f = NULL;
4542 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4543 		err = got_error_from_errno("fclose");
4544 	s->f1 = NULL;
4545 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4546 		err = got_error_from_errno("fclose");
4547 	s->f2 = NULL;
4548 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4549 		err = got_error_from_errno("close");
4550 	s->fd1 = -1;
4551 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4552 		err = got_error_from_errno("close");
4553 	s->fd2 = -1;
4554 	free(s->lines);
4555 	s->lines = NULL;
4556 	s->nlines = 0;
4557 	return err;
4558 }
4559 
4560 static const struct got_error *
4561 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4562     struct got_object_id *id2, const char *label1, const char *label2,
4563     int diff_context, int ignore_whitespace, int force_text_diff,
4564     struct tog_view *parent_view, struct got_repository *repo)
4565 {
4566 	const struct got_error *err;
4567 	struct tog_diff_view_state *s = &view->state.diff;
4568 
4569 	memset(s, 0, sizeof(*s));
4570 	s->fd1 = -1;
4571 	s->fd2 = -1;
4572 
4573 	if (id1 != NULL && id2 != NULL) {
4574 	    int type1, type2;
4575 	    err = got_object_get_type(&type1, repo, id1);
4576 	    if (err)
4577 		return err;
4578 	    err = got_object_get_type(&type2, repo, id2);
4579 	    if (err)
4580 		return err;
4581 
4582 	    if (type1 != type2)
4583 		return got_error(GOT_ERR_OBJ_TYPE);
4584 	}
4585 	s->first_displayed_line = 1;
4586 	s->last_displayed_line = view->nlines;
4587 	s->selected_line = 1;
4588 	s->repo = repo;
4589 	s->id1 = id1;
4590 	s->id2 = id2;
4591 	s->label1 = label1;
4592 	s->label2 = label2;
4593 
4594 	if (id1) {
4595 		s->id1 = got_object_id_dup(id1);
4596 		if (s->id1 == NULL)
4597 			return got_error_from_errno("got_object_id_dup");
4598 	} else
4599 		s->id1 = NULL;
4600 
4601 	s->id2 = got_object_id_dup(id2);
4602 	if (s->id2 == NULL) {
4603 		err = got_error_from_errno("got_object_id_dup");
4604 		goto done;
4605 	}
4606 
4607 	s->f1 = got_opentemp();
4608 	if (s->f1 == NULL) {
4609 		err = got_error_from_errno("got_opentemp");
4610 		goto done;
4611 	}
4612 
4613 	s->f2 = got_opentemp();
4614 	if (s->f2 == NULL) {
4615 		err = got_error_from_errno("got_opentemp");
4616 		goto done;
4617 	}
4618 
4619 	s->fd1 = got_opentempfd();
4620 	if (s->fd1 == -1) {
4621 		err = got_error_from_errno("got_opentempfd");
4622 		goto done;
4623 	}
4624 
4625 	s->fd2 = got_opentempfd();
4626 	if (s->fd2 == -1) {
4627 		err = got_error_from_errno("got_opentempfd");
4628 		goto done;
4629 	}
4630 
4631 	s->first_displayed_line = 1;
4632 	s->last_displayed_line = view->nlines;
4633 	s->diff_context = diff_context;
4634 	s->ignore_whitespace = ignore_whitespace;
4635 	s->force_text_diff = force_text_diff;
4636 	s->parent_view = parent_view;
4637 	s->repo = repo;
4638 
4639 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4640 		int rc;
4641 
4642 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4643 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4644 		if (rc != ERR)
4645 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4646 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4647 		if (rc != ERR)
4648 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4649 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4650 		if (rc != ERR)
4651 			rc = init_pair(GOT_DIFF_LINE_META,
4652 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4653 		if (rc != ERR)
4654 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4655 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4656 		if (rc != ERR)
4657 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4658 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4659 		if (rc != ERR)
4660 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4661 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4662 		if (rc != ERR)
4663 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4664 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4665 		if (rc != ERR)
4666 			rc = init_pair(GOT_DIFF_LINE_DATE,
4667 			    get_color_value("TOG_COLOR_DATE"), -1);
4668 		if (rc == ERR) {
4669 			err = got_error(GOT_ERR_RANGE);
4670 			goto done;
4671 		}
4672 	}
4673 
4674 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4675 	    view_is_splitscreen(view))
4676 		show_log_view(parent_view); /* draw border */
4677 	diff_view_indicate_progress(view);
4678 
4679 	err = create_diff(s);
4680 
4681 	view->show = show_diff_view;
4682 	view->input = input_diff_view;
4683 	view->reset = reset_diff_view;
4684 	view->close = close_diff_view;
4685 	view->search_start = search_start_diff_view;
4686 	view->search_next = search_next_diff_view;
4687 done:
4688 	if (err)
4689 		close_diff_view(view);
4690 	return err;
4691 }
4692 
4693 static const struct got_error *
4694 show_diff_view(struct tog_view *view)
4695 {
4696 	const struct got_error *err;
4697 	struct tog_diff_view_state *s = &view->state.diff;
4698 	char *id_str1 = NULL, *id_str2, *header;
4699 	const char *label1, *label2;
4700 
4701 	if (s->id1) {
4702 		err = got_object_id_str(&id_str1, s->id1);
4703 		if (err)
4704 			return err;
4705 		label1 = s->label1 ? s->label1 : id_str1;
4706 	} else
4707 		label1 = "/dev/null";
4708 
4709 	err = got_object_id_str(&id_str2, s->id2);
4710 	if (err)
4711 		return err;
4712 	label2 = s->label2 ? s->label2 : id_str2;
4713 
4714 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4715 		err = got_error_from_errno("asprintf");
4716 		free(id_str1);
4717 		free(id_str2);
4718 		return err;
4719 	}
4720 	free(id_str1);
4721 	free(id_str2);
4722 
4723 	err = draw_file(view, header);
4724 	free(header);
4725 	return err;
4726 }
4727 
4728 static const struct got_error *
4729 set_selected_commit(struct tog_diff_view_state *s,
4730     struct commit_queue_entry *entry)
4731 {
4732 	const struct got_error *err;
4733 	const struct got_object_id_queue *parent_ids;
4734 	struct got_commit_object *selected_commit;
4735 	struct got_object_qid *pid;
4736 
4737 	free(s->id2);
4738 	s->id2 = got_object_id_dup(entry->id);
4739 	if (s->id2 == NULL)
4740 		return got_error_from_errno("got_object_id_dup");
4741 
4742 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4743 	if (err)
4744 		return err;
4745 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4746 	free(s->id1);
4747 	pid = STAILQ_FIRST(parent_ids);
4748 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4749 	got_object_commit_close(selected_commit);
4750 	return NULL;
4751 }
4752 
4753 static const struct got_error *
4754 reset_diff_view(struct tog_view *view)
4755 {
4756 	struct tog_diff_view_state *s = &view->state.diff;
4757 
4758 	view->count = 0;
4759 	wclear(view->window);
4760 	s->first_displayed_line = 1;
4761 	s->last_displayed_line = view->nlines;
4762 	s->matched_line = 0;
4763 	diff_view_indicate_progress(view);
4764 	return create_diff(s);
4765 }
4766 
4767 static void
4768 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4769 {
4770 	int start, i;
4771 
4772 	i = start = s->first_displayed_line - 1;
4773 
4774 	while (s->lines[i].type != type) {
4775 		if (i == 0)
4776 			i = s->nlines - 1;
4777 		if (--i == start)
4778 			return; /* do nothing, requested type not in file */
4779 	}
4780 
4781 	s->selected_line = 1;
4782 	s->first_displayed_line = i;
4783 }
4784 
4785 static void
4786 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4787 {
4788 	int start, i;
4789 
4790 	i = start = s->first_displayed_line + 1;
4791 
4792 	while (s->lines[i].type != type) {
4793 		if (i == s->nlines - 1)
4794 			i = 0;
4795 		if (++i == start)
4796 			return; /* do nothing, requested type not in file */
4797 	}
4798 
4799 	s->selected_line = 1;
4800 	s->first_displayed_line = i;
4801 }
4802 
4803 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4804     int, int, int);
4805 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4806     int, int);
4807 
4808 static const struct got_error *
4809 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4810 {
4811 	const struct got_error *err = NULL;
4812 	struct tog_diff_view_state *s = &view->state.diff;
4813 	struct tog_log_view_state *ls;
4814 	struct commit_queue_entry *old_selected_entry;
4815 	char *line = NULL;
4816 	size_t linesize = 0;
4817 	ssize_t linelen;
4818 	int i, nscroll = view->nlines - 1, up = 0;
4819 
4820 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
4821 
4822 	switch (ch) {
4823 	case '0':
4824 		view->x = 0;
4825 		break;
4826 	case '$':
4827 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4828 		view->count = 0;
4829 		break;
4830 	case KEY_RIGHT:
4831 	case 'l':
4832 		if (view->x + view->ncols / 3 < view->maxx)
4833 			view->x += 2;  /* move two columns right */
4834 		else
4835 			view->count = 0;
4836 		break;
4837 	case KEY_LEFT:
4838 	case 'h':
4839 		view->x -= MIN(view->x, 2);  /* move two columns back */
4840 		if (view->x <= 0)
4841 			view->count = 0;
4842 		break;
4843 	case 'a':
4844 	case 'w':
4845 		if (ch == 'a')
4846 			s->force_text_diff = !s->force_text_diff;
4847 		if (ch == 'w')
4848 			s->ignore_whitespace = !s->ignore_whitespace;
4849 		err = reset_diff_view(view);
4850 		break;
4851 	case 'g':
4852 	case KEY_HOME:
4853 		s->first_displayed_line = 1;
4854 		view->count = 0;
4855 		break;
4856 	case 'G':
4857 	case KEY_END:
4858 		view->count = 0;
4859 		if (s->eof)
4860 			break;
4861 
4862 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4863 		s->eof = 1;
4864 		break;
4865 	case 'k':
4866 	case KEY_UP:
4867 	case CTRL('p'):
4868 		if (s->first_displayed_line > 1)
4869 			s->first_displayed_line--;
4870 		else
4871 			view->count = 0;
4872 		break;
4873 	case CTRL('u'):
4874 	case 'u':
4875 		nscroll /= 2;
4876 		/* FALL THROUGH */
4877 	case KEY_PPAGE:
4878 	case CTRL('b'):
4879 	case 'b':
4880 		if (s->first_displayed_line == 1) {
4881 			view->count = 0;
4882 			break;
4883 		}
4884 		i = 0;
4885 		while (i++ < nscroll && s->first_displayed_line > 1)
4886 			s->first_displayed_line--;
4887 		break;
4888 	case 'j':
4889 	case KEY_DOWN:
4890 	case CTRL('n'):
4891 		if (!s->eof)
4892 			s->first_displayed_line++;
4893 		else
4894 			view->count = 0;
4895 		break;
4896 	case CTRL('d'):
4897 	case 'd':
4898 		nscroll /= 2;
4899 		/* FALL THROUGH */
4900 	case KEY_NPAGE:
4901 	case CTRL('f'):
4902 	case 'f':
4903 	case ' ':
4904 		if (s->eof) {
4905 			view->count = 0;
4906 			break;
4907 		}
4908 		i = 0;
4909 		while (!s->eof && i++ < nscroll) {
4910 			linelen = getline(&line, &linesize, s->f);
4911 			s->first_displayed_line++;
4912 			if (linelen == -1) {
4913 				if (feof(s->f)) {
4914 					s->eof = 1;
4915 				} else
4916 					err = got_ferror(s->f, GOT_ERR_IO);
4917 				break;
4918 			}
4919 		}
4920 		free(line);
4921 		break;
4922 	case '(':
4923 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
4924 		break;
4925 	case ')':
4926 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
4927 		break;
4928 	case '{':
4929 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
4930 		break;
4931 	case '}':
4932 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
4933 		break;
4934 	case '[':
4935 		if (s->diff_context > 0) {
4936 			s->diff_context--;
4937 			s->matched_line = 0;
4938 			diff_view_indicate_progress(view);
4939 			err = create_diff(s);
4940 			if (s->first_displayed_line + view->nlines - 1 >
4941 			    s->nlines) {
4942 				s->first_displayed_line = 1;
4943 				s->last_displayed_line = view->nlines;
4944 			}
4945 		} else
4946 			view->count = 0;
4947 		break;
4948 	case ']':
4949 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4950 			s->diff_context++;
4951 			s->matched_line = 0;
4952 			diff_view_indicate_progress(view);
4953 			err = create_diff(s);
4954 		} else
4955 			view->count = 0;
4956 		break;
4957 	case '<':
4958 	case ',':
4959 	case 'K':
4960 		up = 1;
4961 		/* FALL THROUGH */
4962 	case '>':
4963 	case '.':
4964 	case 'J':
4965 		if (s->parent_view == NULL) {
4966 			view->count = 0;
4967 			break;
4968 		}
4969 		s->parent_view->count = view->count;
4970 
4971 		if (s->parent_view->type == TOG_VIEW_LOG) {
4972 			ls = &s->parent_view->state.log;
4973 			old_selected_entry = ls->selected_entry;
4974 
4975 			err = input_log_view(NULL, s->parent_view,
4976 			    up ? KEY_UP : KEY_DOWN);
4977 			if (err)
4978 				break;
4979 			view->count = s->parent_view->count;
4980 
4981 			if (old_selected_entry == ls->selected_entry)
4982 				break;
4983 
4984 			err = set_selected_commit(s, ls->selected_entry);
4985 			if (err)
4986 				break;
4987 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4988 			struct tog_blame_view_state *bs;
4989 			struct got_object_id *id, *prev_id;
4990 
4991 			bs = &s->parent_view->state.blame;
4992 			prev_id = get_annotation_for_line(bs->blame.lines,
4993 			    bs->blame.nlines, bs->last_diffed_line);
4994 
4995 			err = input_blame_view(&view, s->parent_view,
4996 			    up ? KEY_UP : KEY_DOWN);
4997 			if (err)
4998 				break;
4999 			view->count = s->parent_view->count;
5000 
5001 			if (prev_id == NULL)
5002 				break;
5003 			id = get_selected_commit_id(bs->blame.lines,
5004 			    bs->blame.nlines, bs->first_displayed_line,
5005 			    bs->selected_line);
5006 			if (id == NULL)
5007 				break;
5008 
5009 			if (!got_object_id_cmp(prev_id, id))
5010 				break;
5011 
5012 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5013 			if (err)
5014 				break;
5015 		}
5016 		s->first_displayed_line = 1;
5017 		s->last_displayed_line = view->nlines;
5018 		s->matched_line = 0;
5019 		view->x = 0;
5020 
5021 		diff_view_indicate_progress(view);
5022 		err = create_diff(s);
5023 		break;
5024 	default:
5025 		view->count = 0;
5026 		break;
5027 	}
5028 
5029 	return err;
5030 }
5031 
5032 static const struct got_error *
5033 cmd_diff(int argc, char *argv[])
5034 {
5035 	const struct got_error *error = NULL;
5036 	struct got_repository *repo = NULL;
5037 	struct got_worktree *worktree = NULL;
5038 	struct got_object_id *id1 = NULL, *id2 = NULL;
5039 	char *repo_path = NULL, *cwd = NULL;
5040 	char *id_str1 = NULL, *id_str2 = NULL;
5041 	char *label1 = NULL, *label2 = NULL;
5042 	int diff_context = 3, ignore_whitespace = 0;
5043 	int ch, force_text_diff = 0;
5044 	const char *errstr;
5045 	struct tog_view *view;
5046 	int *pack_fds = NULL;
5047 
5048 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5049 		switch (ch) {
5050 		case 'a':
5051 			force_text_diff = 1;
5052 			break;
5053 		case 'C':
5054 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5055 			    &errstr);
5056 			if (errstr != NULL)
5057 				errx(1, "number of context lines is %s: %s",
5058 				    errstr, errstr);
5059 			break;
5060 		case 'r':
5061 			repo_path = realpath(optarg, NULL);
5062 			if (repo_path == NULL)
5063 				return got_error_from_errno2("realpath",
5064 				    optarg);
5065 			got_path_strip_trailing_slashes(repo_path);
5066 			break;
5067 		case 'w':
5068 			ignore_whitespace = 1;
5069 			break;
5070 		default:
5071 			usage_diff();
5072 			/* NOTREACHED */
5073 		}
5074 	}
5075 
5076 	argc -= optind;
5077 	argv += optind;
5078 
5079 	if (argc == 0) {
5080 		usage_diff(); /* TODO show local worktree changes */
5081 	} else if (argc == 2) {
5082 		id_str1 = argv[0];
5083 		id_str2 = argv[1];
5084 	} else
5085 		usage_diff();
5086 
5087 	error = got_repo_pack_fds_open(&pack_fds);
5088 	if (error)
5089 		goto done;
5090 
5091 	if (repo_path == NULL) {
5092 		cwd = getcwd(NULL, 0);
5093 		if (cwd == NULL)
5094 			return got_error_from_errno("getcwd");
5095 		error = got_worktree_open(&worktree, cwd);
5096 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5097 			goto done;
5098 		if (worktree)
5099 			repo_path =
5100 			    strdup(got_worktree_get_repo_path(worktree));
5101 		else
5102 			repo_path = strdup(cwd);
5103 		if (repo_path == NULL) {
5104 			error = got_error_from_errno("strdup");
5105 			goto done;
5106 		}
5107 	}
5108 
5109 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5110 	if (error)
5111 		goto done;
5112 
5113 	init_curses();
5114 
5115 	error = apply_unveil(got_repo_get_path(repo), NULL);
5116 	if (error)
5117 		goto done;
5118 
5119 	error = tog_load_refs(repo, 0);
5120 	if (error)
5121 		goto done;
5122 
5123 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5124 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5125 	if (error)
5126 		goto done;
5127 
5128 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5129 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5130 	if (error)
5131 		goto done;
5132 
5133 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5134 	if (view == NULL) {
5135 		error = got_error_from_errno("view_open");
5136 		goto done;
5137 	}
5138 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5139 	    ignore_whitespace, force_text_diff, NULL,  repo);
5140 	if (error)
5141 		goto done;
5142 	error = view_loop(view);
5143 done:
5144 	free(label1);
5145 	free(label2);
5146 	free(repo_path);
5147 	free(cwd);
5148 	if (repo) {
5149 		const struct got_error *close_err = got_repo_close(repo);
5150 		if (error == NULL)
5151 			error = close_err;
5152 	}
5153 	if (worktree)
5154 		got_worktree_close(worktree);
5155 	if (pack_fds) {
5156 		const struct got_error *pack_err =
5157 		    got_repo_pack_fds_close(pack_fds);
5158 		if (error == NULL)
5159 			error = pack_err;
5160 	}
5161 	tog_free_refs();
5162 	return error;
5163 }
5164 
5165 __dead static void
5166 usage_blame(void)
5167 {
5168 	endwin();
5169 	fprintf(stderr,
5170 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5171 	    getprogname());
5172 	exit(1);
5173 }
5174 
5175 struct tog_blame_line {
5176 	int annotated;
5177 	struct got_object_id *id;
5178 };
5179 
5180 static const struct got_error *
5181 draw_blame(struct tog_view *view)
5182 {
5183 	struct tog_blame_view_state *s = &view->state.blame;
5184 	struct tog_blame *blame = &s->blame;
5185 	regmatch_t *regmatch = &view->regmatch;
5186 	const struct got_error *err;
5187 	int lineno = 0, nprinted = 0;
5188 	char *line = NULL;
5189 	size_t linesize = 0;
5190 	ssize_t linelen;
5191 	wchar_t *wline;
5192 	int width;
5193 	struct tog_blame_line *blame_line;
5194 	struct got_object_id *prev_id = NULL;
5195 	char *id_str;
5196 	struct tog_color *tc;
5197 
5198 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5199 	if (err)
5200 		return err;
5201 
5202 	rewind(blame->f);
5203 	werase(view->window);
5204 
5205 	if (asprintf(&line, "commit %s", id_str) == -1) {
5206 		err = got_error_from_errno("asprintf");
5207 		free(id_str);
5208 		return err;
5209 	}
5210 
5211 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5212 	free(line);
5213 	line = NULL;
5214 	if (err)
5215 		return err;
5216 	if (view_needs_focus_indication(view))
5217 		wstandout(view->window);
5218 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5219 	if (tc)
5220 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5221 	waddwstr(view->window, wline);
5222 	while (width++ < view->ncols)
5223 		waddch(view->window, ' ');
5224 	if (tc)
5225 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5226 	if (view_needs_focus_indication(view))
5227 		wstandend(view->window);
5228 	free(wline);
5229 	wline = NULL;
5230 
5231 	if (view->gline > blame->nlines)
5232 		view->gline = blame->nlines;
5233 
5234 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5235 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5236 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5237 		free(id_str);
5238 		return got_error_from_errno("asprintf");
5239 	}
5240 	free(id_str);
5241 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5242 	free(line);
5243 	line = NULL;
5244 	if (err)
5245 		return err;
5246 	waddwstr(view->window, wline);
5247 	free(wline);
5248 	wline = NULL;
5249 	if (width < view->ncols - 1)
5250 		waddch(view->window, '\n');
5251 
5252 	s->eof = 0;
5253 	view->maxx = 0;
5254 	while (nprinted < view->nlines - 2) {
5255 		linelen = getline(&line, &linesize, blame->f);
5256 		if (linelen == -1) {
5257 			if (feof(blame->f)) {
5258 				s->eof = 1;
5259 				break;
5260 			}
5261 			free(line);
5262 			return got_ferror(blame->f, GOT_ERR_IO);
5263 		}
5264 		if (++lineno < s->first_displayed_line)
5265 			continue;
5266 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5267 			continue;
5268 
5269 		/* Set view->maxx based on full line length. */
5270 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5271 		if (err) {
5272 			free(line);
5273 			return err;
5274 		}
5275 		free(wline);
5276 		wline = NULL;
5277 		view->maxx = MAX(view->maxx, width);
5278 
5279 		if (nprinted == s->selected_line - 1)
5280 			wstandout(view->window);
5281 
5282 		if (blame->nlines > 0) {
5283 			blame_line = &blame->lines[lineno - 1];
5284 			if (blame_line->annotated && prev_id &&
5285 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5286 			    !(nprinted == s->selected_line - 1)) {
5287 				waddstr(view->window, "        ");
5288 			} else if (blame_line->annotated) {
5289 				char *id_str;
5290 				err = got_object_id_str(&id_str,
5291 				    blame_line->id);
5292 				if (err) {
5293 					free(line);
5294 					return err;
5295 				}
5296 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5297 				if (tc)
5298 					wattr_on(view->window,
5299 					    COLOR_PAIR(tc->colorpair), NULL);
5300 				wprintw(view->window, "%.8s", id_str);
5301 				if (tc)
5302 					wattr_off(view->window,
5303 					    COLOR_PAIR(tc->colorpair), NULL);
5304 				free(id_str);
5305 				prev_id = blame_line->id;
5306 			} else {
5307 				waddstr(view->window, "........");
5308 				prev_id = NULL;
5309 			}
5310 		} else {
5311 			waddstr(view->window, "........");
5312 			prev_id = NULL;
5313 		}
5314 
5315 		if (nprinted == s->selected_line - 1)
5316 			wstandend(view->window);
5317 		waddstr(view->window, " ");
5318 
5319 		if (view->ncols <= 9) {
5320 			width = 9;
5321 		} else if (s->first_displayed_line + nprinted ==
5322 		    s->matched_line &&
5323 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5324 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5325 			    view->window, view->x, regmatch);
5326 			if (err) {
5327 				free(line);
5328 				return err;
5329 			}
5330 			width += 9;
5331 		} else {
5332 			int skip;
5333 			err = format_line(&wline, &width, &skip, line,
5334 			    view->x, view->ncols - 9, 9, 1);
5335 			if (err) {
5336 				free(line);
5337 				return err;
5338 			}
5339 			waddwstr(view->window, &wline[skip]);
5340 			width += 9;
5341 			free(wline);
5342 			wline = NULL;
5343 		}
5344 
5345 		if (width <= view->ncols - 1)
5346 			waddch(view->window, '\n');
5347 		if (++nprinted == 1)
5348 			s->first_displayed_line = lineno;
5349 	}
5350 	free(line);
5351 	s->last_displayed_line = lineno;
5352 
5353 	view_border(view);
5354 
5355 	return NULL;
5356 }
5357 
5358 static const struct got_error *
5359 blame_cb(void *arg, int nlines, int lineno,
5360     struct got_commit_object *commit, struct got_object_id *id)
5361 {
5362 	const struct got_error *err = NULL;
5363 	struct tog_blame_cb_args *a = arg;
5364 	struct tog_blame_line *line;
5365 	int errcode;
5366 
5367 	if (nlines != a->nlines ||
5368 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5369 		return got_error(GOT_ERR_RANGE);
5370 
5371 	errcode = pthread_mutex_lock(&tog_mutex);
5372 	if (errcode)
5373 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5374 
5375 	if (*a->quit) {	/* user has quit the blame view */
5376 		err = got_error(GOT_ERR_ITER_COMPLETED);
5377 		goto done;
5378 	}
5379 
5380 	if (lineno == -1)
5381 		goto done; /* no change in this commit */
5382 
5383 	line = &a->lines[lineno - 1];
5384 	if (line->annotated)
5385 		goto done;
5386 
5387 	line->id = got_object_id_dup(id);
5388 	if (line->id == NULL) {
5389 		err = got_error_from_errno("got_object_id_dup");
5390 		goto done;
5391 	}
5392 	line->annotated = 1;
5393 done:
5394 	errcode = pthread_mutex_unlock(&tog_mutex);
5395 	if (errcode)
5396 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5397 	return err;
5398 }
5399 
5400 static void *
5401 blame_thread(void *arg)
5402 {
5403 	const struct got_error *err, *close_err;
5404 	struct tog_blame_thread_args *ta = arg;
5405 	struct tog_blame_cb_args *a = ta->cb_args;
5406 	int errcode, fd1 = -1, fd2 = -1;
5407 	FILE *f1 = NULL, *f2 = NULL;
5408 
5409 	fd1 = got_opentempfd();
5410 	if (fd1 == -1)
5411 		return (void *)got_error_from_errno("got_opentempfd");
5412 
5413 	fd2 = got_opentempfd();
5414 	if (fd2 == -1) {
5415 		err = got_error_from_errno("got_opentempfd");
5416 		goto done;
5417 	}
5418 
5419 	f1 = got_opentemp();
5420 	if (f1 == NULL) {
5421 		err = (void *)got_error_from_errno("got_opentemp");
5422 		goto done;
5423 	}
5424 	f2 = got_opentemp();
5425 	if (f2 == NULL) {
5426 		err = (void *)got_error_from_errno("got_opentemp");
5427 		goto done;
5428 	}
5429 
5430 	err = block_signals_used_by_main_thread();
5431 	if (err)
5432 		goto done;
5433 
5434 	err = got_blame(ta->path, a->commit_id, ta->repo,
5435 	    tog_diff_algo, blame_cb, ta->cb_args,
5436 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5437 	if (err && err->code == GOT_ERR_CANCELLED)
5438 		err = NULL;
5439 
5440 	errcode = pthread_mutex_lock(&tog_mutex);
5441 	if (errcode) {
5442 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5443 		goto done;
5444 	}
5445 
5446 	close_err = got_repo_close(ta->repo);
5447 	if (err == NULL)
5448 		err = close_err;
5449 	ta->repo = NULL;
5450 	*ta->complete = 1;
5451 
5452 	errcode = pthread_mutex_unlock(&tog_mutex);
5453 	if (errcode && err == NULL)
5454 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5455 
5456 done:
5457 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5458 		err = got_error_from_errno("close");
5459 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5460 		err = got_error_from_errno("close");
5461 	if (f1 && fclose(f1) == EOF && err == NULL)
5462 		err = got_error_from_errno("fclose");
5463 	if (f2 && fclose(f2) == EOF && err == NULL)
5464 		err = got_error_from_errno("fclose");
5465 
5466 	return (void *)err;
5467 }
5468 
5469 static struct got_object_id *
5470 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5471     int first_displayed_line, int selected_line)
5472 {
5473 	struct tog_blame_line *line;
5474 
5475 	if (nlines <= 0)
5476 		return NULL;
5477 
5478 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5479 	if (!line->annotated)
5480 		return NULL;
5481 
5482 	return line->id;
5483 }
5484 
5485 static struct got_object_id *
5486 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5487     int lineno)
5488 {
5489 	struct tog_blame_line *line;
5490 
5491 	if (nlines <= 0 || lineno >= nlines)
5492 		return NULL;
5493 
5494 	line = &lines[lineno - 1];
5495 	if (!line->annotated)
5496 		return NULL;
5497 
5498 	return line->id;
5499 }
5500 
5501 static const struct got_error *
5502 stop_blame(struct tog_blame *blame)
5503 {
5504 	const struct got_error *err = NULL;
5505 	int i;
5506 
5507 	if (blame->thread) {
5508 		int errcode;
5509 		errcode = pthread_mutex_unlock(&tog_mutex);
5510 		if (errcode)
5511 			return got_error_set_errno(errcode,
5512 			    "pthread_mutex_unlock");
5513 		errcode = pthread_join(blame->thread, (void **)&err);
5514 		if (errcode)
5515 			return got_error_set_errno(errcode, "pthread_join");
5516 		errcode = pthread_mutex_lock(&tog_mutex);
5517 		if (errcode)
5518 			return got_error_set_errno(errcode,
5519 			    "pthread_mutex_lock");
5520 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5521 			err = NULL;
5522 		blame->thread = 0; //NULL;
5523 	}
5524 	if (blame->thread_args.repo) {
5525 		const struct got_error *close_err;
5526 		close_err = got_repo_close(blame->thread_args.repo);
5527 		if (err == NULL)
5528 			err = close_err;
5529 		blame->thread_args.repo = NULL;
5530 	}
5531 	if (blame->f) {
5532 		if (fclose(blame->f) == EOF && err == NULL)
5533 			err = got_error_from_errno("fclose");
5534 		blame->f = NULL;
5535 	}
5536 	if (blame->lines) {
5537 		for (i = 0; i < blame->nlines; i++)
5538 			free(blame->lines[i].id);
5539 		free(blame->lines);
5540 		blame->lines = NULL;
5541 	}
5542 	free(blame->cb_args.commit_id);
5543 	blame->cb_args.commit_id = NULL;
5544 	if (blame->pack_fds) {
5545 		const struct got_error *pack_err =
5546 		    got_repo_pack_fds_close(blame->pack_fds);
5547 		if (err == NULL)
5548 			err = pack_err;
5549 		blame->pack_fds = NULL;
5550 	}
5551 	return err;
5552 }
5553 
5554 static const struct got_error *
5555 cancel_blame_view(void *arg)
5556 {
5557 	const struct got_error *err = NULL;
5558 	int *done = arg;
5559 	int errcode;
5560 
5561 	errcode = pthread_mutex_lock(&tog_mutex);
5562 	if (errcode)
5563 		return got_error_set_errno(errcode,
5564 		    "pthread_mutex_unlock");
5565 
5566 	if (*done)
5567 		err = got_error(GOT_ERR_CANCELLED);
5568 
5569 	errcode = pthread_mutex_unlock(&tog_mutex);
5570 	if (errcode)
5571 		return got_error_set_errno(errcode,
5572 		    "pthread_mutex_lock");
5573 
5574 	return err;
5575 }
5576 
5577 static const struct got_error *
5578 run_blame(struct tog_view *view)
5579 {
5580 	struct tog_blame_view_state *s = &view->state.blame;
5581 	struct tog_blame *blame = &s->blame;
5582 	const struct got_error *err = NULL;
5583 	struct got_commit_object *commit = NULL;
5584 	struct got_blob_object *blob = NULL;
5585 	struct got_repository *thread_repo = NULL;
5586 	struct got_object_id *obj_id = NULL;
5587 	int obj_type, fd = -1;
5588 	int *pack_fds = NULL;
5589 
5590 	err = got_object_open_as_commit(&commit, s->repo,
5591 	    &s->blamed_commit->id);
5592 	if (err)
5593 		return err;
5594 
5595 	fd = got_opentempfd();
5596 	if (fd == -1) {
5597 		err = got_error_from_errno("got_opentempfd");
5598 		goto done;
5599 	}
5600 
5601 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5602 	if (err)
5603 		goto done;
5604 
5605 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5606 	if (err)
5607 		goto done;
5608 
5609 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5610 		err = got_error(GOT_ERR_OBJ_TYPE);
5611 		goto done;
5612 	}
5613 
5614 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5615 	if (err)
5616 		goto done;
5617 	blame->f = got_opentemp();
5618 	if (blame->f == NULL) {
5619 		err = got_error_from_errno("got_opentemp");
5620 		goto done;
5621 	}
5622 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5623 	    &blame->line_offsets, blame->f, blob);
5624 	if (err)
5625 		goto done;
5626 	if (blame->nlines == 0) {
5627 		s->blame_complete = 1;
5628 		goto done;
5629 	}
5630 
5631 	/* Don't include \n at EOF in the blame line count. */
5632 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5633 		blame->nlines--;
5634 
5635 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5636 	if (blame->lines == NULL) {
5637 		err = got_error_from_errno("calloc");
5638 		goto done;
5639 	}
5640 
5641 	err = got_repo_pack_fds_open(&pack_fds);
5642 	if (err)
5643 		goto done;
5644 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5645 	    pack_fds);
5646 	if (err)
5647 		goto done;
5648 
5649 	blame->pack_fds = pack_fds;
5650 	blame->cb_args.view = view;
5651 	blame->cb_args.lines = blame->lines;
5652 	blame->cb_args.nlines = blame->nlines;
5653 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5654 	if (blame->cb_args.commit_id == NULL) {
5655 		err = got_error_from_errno("got_object_id_dup");
5656 		goto done;
5657 	}
5658 	blame->cb_args.quit = &s->done;
5659 
5660 	blame->thread_args.path = s->path;
5661 	blame->thread_args.repo = thread_repo;
5662 	blame->thread_args.cb_args = &blame->cb_args;
5663 	blame->thread_args.complete = &s->blame_complete;
5664 	blame->thread_args.cancel_cb = cancel_blame_view;
5665 	blame->thread_args.cancel_arg = &s->done;
5666 	s->blame_complete = 0;
5667 
5668 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5669 		s->first_displayed_line = 1;
5670 		s->last_displayed_line = view->nlines;
5671 		s->selected_line = 1;
5672 	}
5673 	s->matched_line = 0;
5674 
5675 done:
5676 	if (commit)
5677 		got_object_commit_close(commit);
5678 	if (fd != -1 && close(fd) == -1 && err == NULL)
5679 		err = got_error_from_errno("close");
5680 	if (blob)
5681 		got_object_blob_close(blob);
5682 	free(obj_id);
5683 	if (err)
5684 		stop_blame(blame);
5685 	return err;
5686 }
5687 
5688 static const struct got_error *
5689 open_blame_view(struct tog_view *view, char *path,
5690     struct got_object_id *commit_id, struct got_repository *repo)
5691 {
5692 	const struct got_error *err = NULL;
5693 	struct tog_blame_view_state *s = &view->state.blame;
5694 
5695 	STAILQ_INIT(&s->blamed_commits);
5696 
5697 	s->path = strdup(path);
5698 	if (s->path == NULL)
5699 		return got_error_from_errno("strdup");
5700 
5701 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5702 	if (err) {
5703 		free(s->path);
5704 		return err;
5705 	}
5706 
5707 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5708 	s->first_displayed_line = 1;
5709 	s->last_displayed_line = view->nlines;
5710 	s->selected_line = 1;
5711 	s->blame_complete = 0;
5712 	s->repo = repo;
5713 	s->commit_id = commit_id;
5714 	memset(&s->blame, 0, sizeof(s->blame));
5715 
5716 	STAILQ_INIT(&s->colors);
5717 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5718 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5719 		    get_color_value("TOG_COLOR_COMMIT"));
5720 		if (err)
5721 			return err;
5722 	}
5723 
5724 	view->show = show_blame_view;
5725 	view->input = input_blame_view;
5726 	view->reset = reset_blame_view;
5727 	view->close = close_blame_view;
5728 	view->search_start = search_start_blame_view;
5729 	view->search_next = search_next_blame_view;
5730 
5731 	return run_blame(view);
5732 }
5733 
5734 static const struct got_error *
5735 close_blame_view(struct tog_view *view)
5736 {
5737 	const struct got_error *err = NULL;
5738 	struct tog_blame_view_state *s = &view->state.blame;
5739 
5740 	if (s->blame.thread)
5741 		err = stop_blame(&s->blame);
5742 
5743 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5744 		struct got_object_qid *blamed_commit;
5745 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5746 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5747 		got_object_qid_free(blamed_commit);
5748 	}
5749 
5750 	free(s->path);
5751 	free_colors(&s->colors);
5752 	return err;
5753 }
5754 
5755 static const struct got_error *
5756 search_start_blame_view(struct tog_view *view)
5757 {
5758 	struct tog_blame_view_state *s = &view->state.blame;
5759 
5760 	s->matched_line = 0;
5761 	return NULL;
5762 }
5763 
5764 static const struct got_error *
5765 search_next_blame_view(struct tog_view *view)
5766 {
5767 	struct tog_blame_view_state *s = &view->state.blame;
5768 	const struct got_error *err = NULL;
5769 	int lineno;
5770 	char *line = NULL;
5771 	size_t linesize = 0;
5772 	ssize_t linelen;
5773 
5774 	if (!view->searching) {
5775 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5776 		return NULL;
5777 	}
5778 
5779 	if (s->matched_line) {
5780 		if (view->searching == TOG_SEARCH_FORWARD)
5781 			lineno = s->matched_line + 1;
5782 		else
5783 			lineno = s->matched_line - 1;
5784 	} else
5785 		lineno = s->first_displayed_line - 1 + s->selected_line;
5786 
5787 	while (1) {
5788 		off_t offset;
5789 
5790 		if (lineno <= 0 || lineno > s->blame.nlines) {
5791 			if (s->matched_line == 0) {
5792 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5793 				break;
5794 			}
5795 
5796 			if (view->searching == TOG_SEARCH_FORWARD)
5797 				lineno = 1;
5798 			else
5799 				lineno = s->blame.nlines;
5800 		}
5801 
5802 		offset = s->blame.line_offsets[lineno - 1];
5803 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5804 			free(line);
5805 			return got_error_from_errno("fseeko");
5806 		}
5807 		linelen = getline(&line, &linesize, s->blame.f);
5808 		if (linelen != -1) {
5809 			char *exstr;
5810 			err = expand_tab(&exstr, line);
5811 			if (err)
5812 				break;
5813 			if (match_line(exstr, &view->regex, 1,
5814 			    &view->regmatch)) {
5815 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5816 				s->matched_line = lineno;
5817 				free(exstr);
5818 				break;
5819 			}
5820 			free(exstr);
5821 		}
5822 		if (view->searching == TOG_SEARCH_FORWARD)
5823 			lineno++;
5824 		else
5825 			lineno--;
5826 	}
5827 	free(line);
5828 
5829 	if (s->matched_line) {
5830 		s->first_displayed_line = s->matched_line;
5831 		s->selected_line = 1;
5832 	}
5833 
5834 	return err;
5835 }
5836 
5837 static const struct got_error *
5838 show_blame_view(struct tog_view *view)
5839 {
5840 	const struct got_error *err = NULL;
5841 	struct tog_blame_view_state *s = &view->state.blame;
5842 	int errcode;
5843 
5844 	if (s->blame.thread == 0 && !s->blame_complete) {
5845 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5846 		    &s->blame.thread_args);
5847 		if (errcode)
5848 			return got_error_set_errno(errcode, "pthread_create");
5849 
5850 		halfdelay(1); /* fast refresh while annotating  */
5851 	}
5852 
5853 	if (s->blame_complete)
5854 		halfdelay(10); /* disable fast refresh */
5855 
5856 	err = draw_blame(view);
5857 
5858 	view_border(view);
5859 	return err;
5860 }
5861 
5862 static const struct got_error *
5863 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5864     struct got_repository *repo, struct got_object_id *id)
5865 {
5866 	struct tog_view		*log_view;
5867 	const struct got_error	*err = NULL;
5868 
5869 	*new_view = NULL;
5870 
5871 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5872 	if (log_view == NULL)
5873 		return got_error_from_errno("view_open");
5874 
5875 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5876 	if (err)
5877 		view_close(log_view);
5878 	else
5879 		*new_view = log_view;
5880 
5881 	return err;
5882 }
5883 
5884 static const struct got_error *
5885 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5886 {
5887 	const struct got_error *err = NULL, *thread_err = NULL;
5888 	struct tog_view *diff_view;
5889 	struct tog_blame_view_state *s = &view->state.blame;
5890 	int eos, nscroll, begin_y = 0, begin_x = 0;
5891 
5892 	eos = nscroll = view->nlines - 2;
5893 	if (view_is_hsplit_top(view))
5894 		--eos;  /* border */
5895 
5896 	switch (ch) {
5897 	case '0':
5898 		view->x = 0;
5899 		break;
5900 	case '$':
5901 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5902 		view->count = 0;
5903 		break;
5904 	case KEY_RIGHT:
5905 	case 'l':
5906 		if (view->x + view->ncols / 3 < view->maxx)
5907 			view->x += 2;  /* move two columns right */
5908 		else
5909 			view->count = 0;
5910 		break;
5911 	case KEY_LEFT:
5912 	case 'h':
5913 		view->x -= MIN(view->x, 2);  /* move two columns back */
5914 		if (view->x <= 0)
5915 			view->count = 0;
5916 		break;
5917 	case 'q':
5918 		s->done = 1;
5919 		break;
5920 	case 'g':
5921 	case KEY_HOME:
5922 		s->selected_line = 1;
5923 		s->first_displayed_line = 1;
5924 		view->count = 0;
5925 		break;
5926 	case 'G':
5927 	case KEY_END:
5928 		if (s->blame.nlines < eos) {
5929 			s->selected_line = s->blame.nlines;
5930 			s->first_displayed_line = 1;
5931 		} else {
5932 			s->selected_line = eos;
5933 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5934 		}
5935 		view->count = 0;
5936 		break;
5937 	case 'k':
5938 	case KEY_UP:
5939 	case CTRL('p'):
5940 		if (s->selected_line > 1)
5941 			s->selected_line--;
5942 		else if (s->selected_line == 1 &&
5943 		    s->first_displayed_line > 1)
5944 			s->first_displayed_line--;
5945 		else
5946 			view->count = 0;
5947 		break;
5948 	case CTRL('u'):
5949 	case 'u':
5950 		nscroll /= 2;
5951 		/* FALL THROUGH */
5952 	case KEY_PPAGE:
5953 	case CTRL('b'):
5954 	case 'b':
5955 		if (s->first_displayed_line == 1) {
5956 			if (view->count > 1)
5957 				nscroll += nscroll;
5958 			s->selected_line = MAX(1, s->selected_line - nscroll);
5959 			view->count = 0;
5960 			break;
5961 		}
5962 		if (s->first_displayed_line > nscroll)
5963 			s->first_displayed_line -= nscroll;
5964 		else
5965 			s->first_displayed_line = 1;
5966 		break;
5967 	case 'j':
5968 	case KEY_DOWN:
5969 	case CTRL('n'):
5970 		if (s->selected_line < eos && s->first_displayed_line +
5971 		    s->selected_line <= s->blame.nlines)
5972 			s->selected_line++;
5973 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5974 			s->first_displayed_line++;
5975 		else
5976 			view->count = 0;
5977 		break;
5978 	case 'c':
5979 	case 'p': {
5980 		struct got_object_id *id = NULL;
5981 
5982 		view->count = 0;
5983 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5984 		    s->first_displayed_line, s->selected_line);
5985 		if (id == NULL)
5986 			break;
5987 		if (ch == 'p') {
5988 			struct got_commit_object *commit, *pcommit;
5989 			struct got_object_qid *pid;
5990 			struct got_object_id *blob_id = NULL;
5991 			int obj_type;
5992 			err = got_object_open_as_commit(&commit,
5993 			    s->repo, id);
5994 			if (err)
5995 				break;
5996 			pid = STAILQ_FIRST(
5997 			    got_object_commit_get_parent_ids(commit));
5998 			if (pid == NULL) {
5999 				got_object_commit_close(commit);
6000 				break;
6001 			}
6002 			/* Check if path history ends here. */
6003 			err = got_object_open_as_commit(&pcommit,
6004 			    s->repo, &pid->id);
6005 			if (err)
6006 				break;
6007 			err = got_object_id_by_path(&blob_id, s->repo,
6008 			    pcommit, s->path);
6009 			got_object_commit_close(pcommit);
6010 			if (err) {
6011 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6012 					err = NULL;
6013 				got_object_commit_close(commit);
6014 				break;
6015 			}
6016 			err = got_object_get_type(&obj_type, s->repo,
6017 			    blob_id);
6018 			free(blob_id);
6019 			/* Can't blame non-blob type objects. */
6020 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6021 				got_object_commit_close(commit);
6022 				break;
6023 			}
6024 			err = got_object_qid_alloc(&s->blamed_commit,
6025 			    &pid->id);
6026 			got_object_commit_close(commit);
6027 		} else {
6028 			if (got_object_id_cmp(id,
6029 			    &s->blamed_commit->id) == 0)
6030 				break;
6031 			err = got_object_qid_alloc(&s->blamed_commit,
6032 			    id);
6033 		}
6034 		if (err)
6035 			break;
6036 		s->done = 1;
6037 		thread_err = stop_blame(&s->blame);
6038 		s->done = 0;
6039 		if (thread_err)
6040 			break;
6041 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6042 		    s->blamed_commit, entry);
6043 		err = run_blame(view);
6044 		if (err)
6045 			break;
6046 		break;
6047 	}
6048 	case 'C': {
6049 		struct got_object_qid *first;
6050 
6051 		view->count = 0;
6052 		first = STAILQ_FIRST(&s->blamed_commits);
6053 		if (!got_object_id_cmp(&first->id, s->commit_id))
6054 			break;
6055 		s->done = 1;
6056 		thread_err = stop_blame(&s->blame);
6057 		s->done = 0;
6058 		if (thread_err)
6059 			break;
6060 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6061 		got_object_qid_free(s->blamed_commit);
6062 		s->blamed_commit =
6063 		    STAILQ_FIRST(&s->blamed_commits);
6064 		err = run_blame(view);
6065 		if (err)
6066 			break;
6067 		break;
6068 	}
6069 	case 'L':
6070 		view->count = 0;
6071 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6072 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6073 		if (s->id_to_log)
6074 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6075 		break;
6076 	case KEY_ENTER:
6077 	case '\r': {
6078 		struct got_object_id *id = NULL;
6079 		struct got_object_qid *pid;
6080 		struct got_commit_object *commit = NULL;
6081 
6082 		view->count = 0;
6083 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6084 		    s->first_displayed_line, s->selected_line);
6085 		if (id == NULL)
6086 			break;
6087 		err = got_object_open_as_commit(&commit, s->repo, id);
6088 		if (err)
6089 			break;
6090 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6091 		if (*new_view) {
6092 			/* traversed from diff view, release diff resources  */
6093 			err = close_diff_view(*new_view);
6094 			if (err)
6095 				break;
6096 			diff_view = *new_view;
6097 		} else {
6098 			if (view_is_parent_view(view))
6099 				view_get_split(view, &begin_y, &begin_x);
6100 
6101 			diff_view = view_open(0, 0, begin_y, begin_x,
6102 			    TOG_VIEW_DIFF);
6103 			if (diff_view == NULL) {
6104 				got_object_commit_close(commit);
6105 				err = got_error_from_errno("view_open");
6106 				break;
6107 			}
6108 		}
6109 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6110 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6111 		got_object_commit_close(commit);
6112 		if (err) {
6113 			view_close(diff_view);
6114 			break;
6115 		}
6116 		s->last_diffed_line = s->first_displayed_line - 1 +
6117 		    s->selected_line;
6118 		if (*new_view)
6119 			break;	/* still open from active diff view */
6120 		if (view_is_parent_view(view) &&
6121 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6122 			err = view_init_hsplit(view, begin_y);
6123 			if (err)
6124 				break;
6125 		}
6126 
6127 		view->focussed = 0;
6128 		diff_view->focussed = 1;
6129 		diff_view->mode = view->mode;
6130 		diff_view->nlines = view->lines - begin_y;
6131 		if (view_is_parent_view(view)) {
6132 			view_transfer_size(diff_view, view);
6133 			err = view_close_child(view);
6134 			if (err)
6135 				break;
6136 			err = view_set_child(view, diff_view);
6137 			if (err)
6138 				break;
6139 			view->focus_child = 1;
6140 		} else
6141 			*new_view = diff_view;
6142 		if (err)
6143 			break;
6144 		break;
6145 	}
6146 	case CTRL('d'):
6147 	case 'd':
6148 		nscroll /= 2;
6149 		/* FALL THROUGH */
6150 	case KEY_NPAGE:
6151 	case CTRL('f'):
6152 	case 'f':
6153 	case ' ':
6154 		if (s->last_displayed_line >= s->blame.nlines &&
6155 		    s->selected_line >= MIN(s->blame.nlines,
6156 		    view->nlines - 2)) {
6157 			view->count = 0;
6158 			break;
6159 		}
6160 		if (s->last_displayed_line >= s->blame.nlines &&
6161 		    s->selected_line < view->nlines - 2) {
6162 			s->selected_line +=
6163 			    MIN(nscroll, s->last_displayed_line -
6164 			    s->first_displayed_line - s->selected_line + 1);
6165 		}
6166 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6167 			s->first_displayed_line += nscroll;
6168 		else
6169 			s->first_displayed_line =
6170 			    s->blame.nlines - (view->nlines - 3);
6171 		break;
6172 	case KEY_RESIZE:
6173 		if (s->selected_line > view->nlines - 2) {
6174 			s->selected_line = MIN(s->blame.nlines,
6175 			    view->nlines - 2);
6176 		}
6177 		break;
6178 	default:
6179 		view->count = 0;
6180 		break;
6181 	}
6182 	return thread_err ? thread_err : err;
6183 }
6184 
6185 static const struct got_error *
6186 reset_blame_view(struct tog_view *view)
6187 {
6188 	const struct got_error *err;
6189 	struct tog_blame_view_state *s = &view->state.blame;
6190 
6191 	view->count = 0;
6192 	s->done = 1;
6193 	err = stop_blame(&s->blame);
6194 	s->done = 0;
6195 	if (err)
6196 		return err;
6197 	return run_blame(view);
6198 }
6199 
6200 static const struct got_error *
6201 cmd_blame(int argc, char *argv[])
6202 {
6203 	const struct got_error *error;
6204 	struct got_repository *repo = NULL;
6205 	struct got_worktree *worktree = NULL;
6206 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6207 	char *link_target = NULL;
6208 	struct got_object_id *commit_id = NULL;
6209 	struct got_commit_object *commit = NULL;
6210 	char *commit_id_str = NULL;
6211 	int ch;
6212 	struct tog_view *view;
6213 	int *pack_fds = NULL;
6214 
6215 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6216 		switch (ch) {
6217 		case 'c':
6218 			commit_id_str = optarg;
6219 			break;
6220 		case 'r':
6221 			repo_path = realpath(optarg, NULL);
6222 			if (repo_path == NULL)
6223 				return got_error_from_errno2("realpath",
6224 				    optarg);
6225 			break;
6226 		default:
6227 			usage_blame();
6228 			/* NOTREACHED */
6229 		}
6230 	}
6231 
6232 	argc -= optind;
6233 	argv += optind;
6234 
6235 	if (argc != 1)
6236 		usage_blame();
6237 
6238 	error = got_repo_pack_fds_open(&pack_fds);
6239 	if (error != NULL)
6240 		goto done;
6241 
6242 	if (repo_path == NULL) {
6243 		cwd = getcwd(NULL, 0);
6244 		if (cwd == NULL)
6245 			return got_error_from_errno("getcwd");
6246 		error = got_worktree_open(&worktree, cwd);
6247 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6248 			goto done;
6249 		if (worktree)
6250 			repo_path =
6251 			    strdup(got_worktree_get_repo_path(worktree));
6252 		else
6253 			repo_path = strdup(cwd);
6254 		if (repo_path == NULL) {
6255 			error = got_error_from_errno("strdup");
6256 			goto done;
6257 		}
6258 	}
6259 
6260 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6261 	if (error != NULL)
6262 		goto done;
6263 
6264 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6265 	    worktree);
6266 	if (error)
6267 		goto done;
6268 
6269 	init_curses();
6270 
6271 	error = apply_unveil(got_repo_get_path(repo), NULL);
6272 	if (error)
6273 		goto done;
6274 
6275 	error = tog_load_refs(repo, 0);
6276 	if (error)
6277 		goto done;
6278 
6279 	if (commit_id_str == NULL) {
6280 		struct got_reference *head_ref;
6281 		error = got_ref_open(&head_ref, repo, worktree ?
6282 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6283 		if (error != NULL)
6284 			goto done;
6285 		error = got_ref_resolve(&commit_id, repo, head_ref);
6286 		got_ref_close(head_ref);
6287 	} else {
6288 		error = got_repo_match_object_id(&commit_id, NULL,
6289 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6290 	}
6291 	if (error != NULL)
6292 		goto done;
6293 
6294 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6295 	if (view == NULL) {
6296 		error = got_error_from_errno("view_open");
6297 		goto done;
6298 	}
6299 
6300 	error = got_object_open_as_commit(&commit, repo, commit_id);
6301 	if (error)
6302 		goto done;
6303 
6304 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6305 	    commit, repo);
6306 	if (error)
6307 		goto done;
6308 
6309 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6310 	    commit_id, repo);
6311 	if (error)
6312 		goto done;
6313 	if (worktree) {
6314 		/* Release work tree lock. */
6315 		got_worktree_close(worktree);
6316 		worktree = NULL;
6317 	}
6318 	error = view_loop(view);
6319 done:
6320 	free(repo_path);
6321 	free(in_repo_path);
6322 	free(link_target);
6323 	free(cwd);
6324 	free(commit_id);
6325 	if (commit)
6326 		got_object_commit_close(commit);
6327 	if (worktree)
6328 		got_worktree_close(worktree);
6329 	if (repo) {
6330 		const struct got_error *close_err = got_repo_close(repo);
6331 		if (error == NULL)
6332 			error = close_err;
6333 	}
6334 	if (pack_fds) {
6335 		const struct got_error *pack_err =
6336 		    got_repo_pack_fds_close(pack_fds);
6337 		if (error == NULL)
6338 			error = pack_err;
6339 	}
6340 	tog_free_refs();
6341 	return error;
6342 }
6343 
6344 static const struct got_error *
6345 draw_tree_entries(struct tog_view *view, const char *parent_path)
6346 {
6347 	struct tog_tree_view_state *s = &view->state.tree;
6348 	const struct got_error *err = NULL;
6349 	struct got_tree_entry *te;
6350 	wchar_t *wline;
6351 	char *index = NULL;
6352 	struct tog_color *tc;
6353 	int width, n, nentries, i = 1;
6354 	int limit = view->nlines;
6355 
6356 	s->ndisplayed = 0;
6357 	if (view_is_hsplit_top(view))
6358 		--limit;  /* border */
6359 
6360 	werase(view->window);
6361 
6362 	if (limit == 0)
6363 		return NULL;
6364 
6365 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6366 	    0, 0);
6367 	if (err)
6368 		return err;
6369 	if (view_needs_focus_indication(view))
6370 		wstandout(view->window);
6371 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6372 	if (tc)
6373 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6374 	waddwstr(view->window, wline);
6375 	free(wline);
6376 	wline = NULL;
6377 	while (width++ < view->ncols)
6378 		waddch(view->window, ' ');
6379 	if (tc)
6380 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6381 	if (view_needs_focus_indication(view))
6382 		wstandend(view->window);
6383 	if (--limit <= 0)
6384 		return NULL;
6385 
6386 	i += s->selected;
6387 	if (s->first_displayed_entry) {
6388 		i += got_tree_entry_get_index(s->first_displayed_entry);
6389 		if (s->tree != s->root)
6390 			++i;  /* account for ".." entry */
6391 	}
6392 	nentries = got_object_tree_get_nentries(s->tree);
6393 	if (asprintf(&index, "[%d/%d] %s",
6394 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6395 		return got_error_from_errno("asprintf");
6396 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6397 	free(index);
6398 	if (err)
6399 		return err;
6400 	waddwstr(view->window, wline);
6401 	free(wline);
6402 	wline = NULL;
6403 	if (width < view->ncols - 1)
6404 		waddch(view->window, '\n');
6405 	if (--limit <= 0)
6406 		return NULL;
6407 	waddch(view->window, '\n');
6408 	if (--limit <= 0)
6409 		return NULL;
6410 
6411 	if (s->first_displayed_entry == NULL) {
6412 		te = got_object_tree_get_first_entry(s->tree);
6413 		if (s->selected == 0) {
6414 			if (view->focussed)
6415 				wstandout(view->window);
6416 			s->selected_entry = NULL;
6417 		}
6418 		waddstr(view->window, "  ..\n");	/* parent directory */
6419 		if (s->selected == 0 && view->focussed)
6420 			wstandend(view->window);
6421 		s->ndisplayed++;
6422 		if (--limit <= 0)
6423 			return NULL;
6424 		n = 1;
6425 	} else {
6426 		n = 0;
6427 		te = s->first_displayed_entry;
6428 	}
6429 
6430 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6431 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6432 		const char *modestr = "";
6433 		mode_t mode;
6434 
6435 		te = got_object_tree_get_entry(s->tree, i);
6436 		mode = got_tree_entry_get_mode(te);
6437 
6438 		if (s->show_ids) {
6439 			err = got_object_id_str(&id_str,
6440 			    got_tree_entry_get_id(te));
6441 			if (err)
6442 				return got_error_from_errno(
6443 				    "got_object_id_str");
6444 		}
6445 		if (got_object_tree_entry_is_submodule(te))
6446 			modestr = "$";
6447 		else if (S_ISLNK(mode)) {
6448 			int i;
6449 
6450 			err = got_tree_entry_get_symlink_target(&link_target,
6451 			    te, s->repo);
6452 			if (err) {
6453 				free(id_str);
6454 				return err;
6455 			}
6456 			for (i = 0; i < strlen(link_target); i++) {
6457 				if (!isprint((unsigned char)link_target[i]))
6458 					link_target[i] = '?';
6459 			}
6460 			modestr = "@";
6461 		}
6462 		else if (S_ISDIR(mode))
6463 			modestr = "/";
6464 		else if (mode & S_IXUSR)
6465 			modestr = "*";
6466 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6467 		    got_tree_entry_get_name(te), modestr,
6468 		    link_target ? " -> ": "",
6469 		    link_target ? link_target : "") == -1) {
6470 			free(id_str);
6471 			free(link_target);
6472 			return got_error_from_errno("asprintf");
6473 		}
6474 		free(id_str);
6475 		free(link_target);
6476 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6477 		    0, 0);
6478 		if (err) {
6479 			free(line);
6480 			break;
6481 		}
6482 		if (n == s->selected) {
6483 			if (view->focussed)
6484 				wstandout(view->window);
6485 			s->selected_entry = te;
6486 		}
6487 		tc = match_color(&s->colors, line);
6488 		if (tc)
6489 			wattr_on(view->window,
6490 			    COLOR_PAIR(tc->colorpair), NULL);
6491 		waddwstr(view->window, wline);
6492 		if (tc)
6493 			wattr_off(view->window,
6494 			    COLOR_PAIR(tc->colorpair), NULL);
6495 		if (width < view->ncols - 1)
6496 			waddch(view->window, '\n');
6497 		if (n == s->selected && view->focussed)
6498 			wstandend(view->window);
6499 		free(line);
6500 		free(wline);
6501 		wline = NULL;
6502 		n++;
6503 		s->ndisplayed++;
6504 		s->last_displayed_entry = te;
6505 		if (--limit <= 0)
6506 			break;
6507 	}
6508 
6509 	return err;
6510 }
6511 
6512 static void
6513 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6514 {
6515 	struct got_tree_entry *te;
6516 	int isroot = s->tree == s->root;
6517 	int i = 0;
6518 
6519 	if (s->first_displayed_entry == NULL)
6520 		return;
6521 
6522 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6523 	while (i++ < maxscroll) {
6524 		if (te == NULL) {
6525 			if (!isroot)
6526 				s->first_displayed_entry = NULL;
6527 			break;
6528 		}
6529 		s->first_displayed_entry = te;
6530 		te = got_tree_entry_get_prev(s->tree, te);
6531 	}
6532 }
6533 
6534 static const struct got_error *
6535 tree_scroll_down(struct tog_view *view, int maxscroll)
6536 {
6537 	struct tog_tree_view_state *s = &view->state.tree;
6538 	struct got_tree_entry *next, *last;
6539 	int n = 0;
6540 
6541 	if (s->first_displayed_entry)
6542 		next = got_tree_entry_get_next(s->tree,
6543 		    s->first_displayed_entry);
6544 	else
6545 		next = got_object_tree_get_first_entry(s->tree);
6546 
6547 	last = s->last_displayed_entry;
6548 	while (next && n++ < maxscroll) {
6549 		if (last) {
6550 			s->last_displayed_entry = last;
6551 			last = got_tree_entry_get_next(s->tree, last);
6552 		}
6553 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6554 			s->first_displayed_entry = next;
6555 			next = got_tree_entry_get_next(s->tree, next);
6556 		}
6557 	}
6558 
6559 	return NULL;
6560 }
6561 
6562 static const struct got_error *
6563 tree_entry_path(char **path, struct tog_parent_trees *parents,
6564     struct got_tree_entry *te)
6565 {
6566 	const struct got_error *err = NULL;
6567 	struct tog_parent_tree *pt;
6568 	size_t len = 2; /* for leading slash and NUL */
6569 
6570 	TAILQ_FOREACH(pt, parents, entry)
6571 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6572 		    + 1 /* slash */;
6573 	if (te)
6574 		len += strlen(got_tree_entry_get_name(te));
6575 
6576 	*path = calloc(1, len);
6577 	if (path == NULL)
6578 		return got_error_from_errno("calloc");
6579 
6580 	(*path)[0] = '/';
6581 	pt = TAILQ_LAST(parents, tog_parent_trees);
6582 	while (pt) {
6583 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6584 		if (strlcat(*path, name, len) >= len) {
6585 			err = got_error(GOT_ERR_NO_SPACE);
6586 			goto done;
6587 		}
6588 		if (strlcat(*path, "/", len) >= len) {
6589 			err = got_error(GOT_ERR_NO_SPACE);
6590 			goto done;
6591 		}
6592 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6593 	}
6594 	if (te) {
6595 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6596 			err = got_error(GOT_ERR_NO_SPACE);
6597 			goto done;
6598 		}
6599 	}
6600 done:
6601 	if (err) {
6602 		free(*path);
6603 		*path = NULL;
6604 	}
6605 	return err;
6606 }
6607 
6608 static const struct got_error *
6609 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6610     struct got_tree_entry *te, struct tog_parent_trees *parents,
6611     struct got_object_id *commit_id, struct got_repository *repo)
6612 {
6613 	const struct got_error *err = NULL;
6614 	char *path;
6615 	struct tog_view *blame_view;
6616 
6617 	*new_view = NULL;
6618 
6619 	err = tree_entry_path(&path, parents, te);
6620 	if (err)
6621 		return err;
6622 
6623 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6624 	if (blame_view == NULL) {
6625 		err = got_error_from_errno("view_open");
6626 		goto done;
6627 	}
6628 
6629 	err = open_blame_view(blame_view, path, commit_id, repo);
6630 	if (err) {
6631 		if (err->code == GOT_ERR_CANCELLED)
6632 			err = NULL;
6633 		view_close(blame_view);
6634 	} else
6635 		*new_view = blame_view;
6636 done:
6637 	free(path);
6638 	return err;
6639 }
6640 
6641 static const struct got_error *
6642 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6643     struct tog_tree_view_state *s)
6644 {
6645 	struct tog_view *log_view;
6646 	const struct got_error *err = NULL;
6647 	char *path;
6648 
6649 	*new_view = NULL;
6650 
6651 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6652 	if (log_view == NULL)
6653 		return got_error_from_errno("view_open");
6654 
6655 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6656 	if (err)
6657 		return err;
6658 
6659 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6660 	    path, 0);
6661 	if (err)
6662 		view_close(log_view);
6663 	else
6664 		*new_view = log_view;
6665 	free(path);
6666 	return err;
6667 }
6668 
6669 static const struct got_error *
6670 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6671     const char *head_ref_name, struct got_repository *repo)
6672 {
6673 	const struct got_error *err = NULL;
6674 	char *commit_id_str = NULL;
6675 	struct tog_tree_view_state *s = &view->state.tree;
6676 	struct got_commit_object *commit = NULL;
6677 
6678 	TAILQ_INIT(&s->parents);
6679 	STAILQ_INIT(&s->colors);
6680 
6681 	s->commit_id = got_object_id_dup(commit_id);
6682 	if (s->commit_id == NULL)
6683 		return got_error_from_errno("got_object_id_dup");
6684 
6685 	err = got_object_open_as_commit(&commit, repo, commit_id);
6686 	if (err)
6687 		goto done;
6688 
6689 	/*
6690 	 * The root is opened here and will be closed when the view is closed.
6691 	 * Any visited subtrees and their path-wise parents are opened and
6692 	 * closed on demand.
6693 	 */
6694 	err = got_object_open_as_tree(&s->root, repo,
6695 	    got_object_commit_get_tree_id(commit));
6696 	if (err)
6697 		goto done;
6698 	s->tree = s->root;
6699 
6700 	err = got_object_id_str(&commit_id_str, commit_id);
6701 	if (err != NULL)
6702 		goto done;
6703 
6704 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6705 		err = got_error_from_errno("asprintf");
6706 		goto done;
6707 	}
6708 
6709 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6710 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6711 	if (head_ref_name) {
6712 		s->head_ref_name = strdup(head_ref_name);
6713 		if (s->head_ref_name == NULL) {
6714 			err = got_error_from_errno("strdup");
6715 			goto done;
6716 		}
6717 	}
6718 	s->repo = repo;
6719 
6720 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6721 		err = add_color(&s->colors, "\\$$",
6722 		    TOG_COLOR_TREE_SUBMODULE,
6723 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6724 		if (err)
6725 			goto done;
6726 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6727 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6728 		if (err)
6729 			goto done;
6730 		err = add_color(&s->colors, "/$",
6731 		    TOG_COLOR_TREE_DIRECTORY,
6732 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6733 		if (err)
6734 			goto done;
6735 
6736 		err = add_color(&s->colors, "\\*$",
6737 		    TOG_COLOR_TREE_EXECUTABLE,
6738 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6739 		if (err)
6740 			goto done;
6741 
6742 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6743 		    get_color_value("TOG_COLOR_COMMIT"));
6744 		if (err)
6745 			goto done;
6746 	}
6747 
6748 	view->show = show_tree_view;
6749 	view->input = input_tree_view;
6750 	view->close = close_tree_view;
6751 	view->search_start = search_start_tree_view;
6752 	view->search_next = search_next_tree_view;
6753 done:
6754 	free(commit_id_str);
6755 	if (commit)
6756 		got_object_commit_close(commit);
6757 	if (err)
6758 		close_tree_view(view);
6759 	return err;
6760 }
6761 
6762 static const struct got_error *
6763 close_tree_view(struct tog_view *view)
6764 {
6765 	struct tog_tree_view_state *s = &view->state.tree;
6766 
6767 	free_colors(&s->colors);
6768 	free(s->tree_label);
6769 	s->tree_label = NULL;
6770 	free(s->commit_id);
6771 	s->commit_id = NULL;
6772 	free(s->head_ref_name);
6773 	s->head_ref_name = NULL;
6774 	while (!TAILQ_EMPTY(&s->parents)) {
6775 		struct tog_parent_tree *parent;
6776 		parent = TAILQ_FIRST(&s->parents);
6777 		TAILQ_REMOVE(&s->parents, parent, entry);
6778 		if (parent->tree != s->root)
6779 			got_object_tree_close(parent->tree);
6780 		free(parent);
6781 
6782 	}
6783 	if (s->tree != NULL && s->tree != s->root)
6784 		got_object_tree_close(s->tree);
6785 	if (s->root)
6786 		got_object_tree_close(s->root);
6787 	return NULL;
6788 }
6789 
6790 static const struct got_error *
6791 search_start_tree_view(struct tog_view *view)
6792 {
6793 	struct tog_tree_view_state *s = &view->state.tree;
6794 
6795 	s->matched_entry = NULL;
6796 	return NULL;
6797 }
6798 
6799 static int
6800 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6801 {
6802 	regmatch_t regmatch;
6803 
6804 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6805 	    0) == 0;
6806 }
6807 
6808 static const struct got_error *
6809 search_next_tree_view(struct tog_view *view)
6810 {
6811 	struct tog_tree_view_state *s = &view->state.tree;
6812 	struct got_tree_entry *te = NULL;
6813 
6814 	if (!view->searching) {
6815 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6816 		return NULL;
6817 	}
6818 
6819 	if (s->matched_entry) {
6820 		if (view->searching == TOG_SEARCH_FORWARD) {
6821 			if (s->selected_entry)
6822 				te = got_tree_entry_get_next(s->tree,
6823 				    s->selected_entry);
6824 			else
6825 				te = got_object_tree_get_first_entry(s->tree);
6826 		} else {
6827 			if (s->selected_entry == NULL)
6828 				te = got_object_tree_get_last_entry(s->tree);
6829 			else
6830 				te = got_tree_entry_get_prev(s->tree,
6831 				    s->selected_entry);
6832 		}
6833 	} else {
6834 		if (s->selected_entry)
6835 			te = s->selected_entry;
6836 		else if (view->searching == TOG_SEARCH_FORWARD)
6837 			te = got_object_tree_get_first_entry(s->tree);
6838 		else
6839 			te = got_object_tree_get_last_entry(s->tree);
6840 	}
6841 
6842 	while (1) {
6843 		if (te == NULL) {
6844 			if (s->matched_entry == NULL) {
6845 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6846 				return NULL;
6847 			}
6848 			if (view->searching == TOG_SEARCH_FORWARD)
6849 				te = got_object_tree_get_first_entry(s->tree);
6850 			else
6851 				te = got_object_tree_get_last_entry(s->tree);
6852 		}
6853 
6854 		if (match_tree_entry(te, &view->regex)) {
6855 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6856 			s->matched_entry = te;
6857 			break;
6858 		}
6859 
6860 		if (view->searching == TOG_SEARCH_FORWARD)
6861 			te = got_tree_entry_get_next(s->tree, te);
6862 		else
6863 			te = got_tree_entry_get_prev(s->tree, te);
6864 	}
6865 
6866 	if (s->matched_entry) {
6867 		s->first_displayed_entry = s->matched_entry;
6868 		s->selected = 0;
6869 	}
6870 
6871 	return NULL;
6872 }
6873 
6874 static const struct got_error *
6875 show_tree_view(struct tog_view *view)
6876 {
6877 	const struct got_error *err = NULL;
6878 	struct tog_tree_view_state *s = &view->state.tree;
6879 	char *parent_path;
6880 
6881 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6882 	if (err)
6883 		return err;
6884 
6885 	err = draw_tree_entries(view, parent_path);
6886 	free(parent_path);
6887 
6888 	view_border(view);
6889 	return err;
6890 }
6891 
6892 static const struct got_error *
6893 tree_goto_line(struct tog_view *view, int nlines)
6894 {
6895 	const struct got_error		 *err = NULL;
6896 	struct tog_tree_view_state	 *s = &view->state.tree;
6897 	struct got_tree_entry		**fte, **lte, **ste;
6898 	int				  g, last, first = 1, i = 1;
6899 	int				  root = s->tree == s->root;
6900 	int				  off = root ? 1 : 2;
6901 
6902 	g = view->gline;
6903 	view->gline = 0;
6904 
6905 	if (g == 0)
6906 		g = 1;
6907 	else if (g > got_object_tree_get_nentries(s->tree))
6908 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
6909 
6910 	fte = &s->first_displayed_entry;
6911 	lte = &s->last_displayed_entry;
6912 	ste = &s->selected_entry;
6913 
6914 	if (*fte != NULL) {
6915 		first = got_tree_entry_get_index(*fte);
6916 		first += off;  /* account for ".." */
6917 	}
6918 	last = got_tree_entry_get_index(*lte);
6919 	last += off;
6920 
6921 	if (g >= first && g <= last && g - first < nlines) {
6922 		s->selected = g - first;
6923 		return NULL;	/* gline is on the current page */
6924 	}
6925 
6926 	if (*ste != NULL) {
6927 		i = got_tree_entry_get_index(*ste);
6928 		i += off;
6929 	}
6930 
6931 	if (i < g) {
6932 		err = tree_scroll_down(view, g - i);
6933 		if (err)
6934 			return err;
6935 		if (got_tree_entry_get_index(*lte) >=
6936 		    got_object_tree_get_nentries(s->tree) - 1 &&
6937 		    first + s->selected < g &&
6938 		    s->selected < s->ndisplayed - 1) {
6939 			first = got_tree_entry_get_index(*fte);
6940 			first += off;
6941 			s->selected = g - first;
6942 		}
6943 	} else if (i > g)
6944 		tree_scroll_up(s, i - g);
6945 
6946 	if (g < nlines &&
6947 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
6948 		s->selected = g - 1;
6949 
6950 	return NULL;
6951 }
6952 
6953 static const struct got_error *
6954 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6955 {
6956 	const struct got_error *err = NULL;
6957 	struct tog_tree_view_state *s = &view->state.tree;
6958 	struct got_tree_entry *te;
6959 	int n, nscroll = view->nlines - 3;
6960 
6961 	if (view->gline)
6962 		return tree_goto_line(view, nscroll);
6963 
6964 	switch (ch) {
6965 	case 'i':
6966 		s->show_ids = !s->show_ids;
6967 		view->count = 0;
6968 		break;
6969 	case 'L':
6970 		view->count = 0;
6971 		if (!s->selected_entry)
6972 			break;
6973 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
6974 		break;
6975 	case 'R':
6976 		view->count = 0;
6977 		err = view_request_new(new_view, view, TOG_VIEW_REF);
6978 		break;
6979 	case 'g':
6980 	case KEY_HOME:
6981 		s->selected = 0;
6982 		view->count = 0;
6983 		if (s->tree == s->root)
6984 			s->first_displayed_entry =
6985 			    got_object_tree_get_first_entry(s->tree);
6986 		else
6987 			s->first_displayed_entry = NULL;
6988 		break;
6989 	case 'G':
6990 	case KEY_END: {
6991 		int eos = view->nlines - 3;
6992 
6993 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6994 			--eos;  /* border */
6995 		s->selected = 0;
6996 		view->count = 0;
6997 		te = got_object_tree_get_last_entry(s->tree);
6998 		for (n = 0; n < eos; n++) {
6999 			if (te == NULL) {
7000 				if (s->tree != s->root) {
7001 					s->first_displayed_entry = NULL;
7002 					n++;
7003 				}
7004 				break;
7005 			}
7006 			s->first_displayed_entry = te;
7007 			te = got_tree_entry_get_prev(s->tree, te);
7008 		}
7009 		if (n > 0)
7010 			s->selected = n - 1;
7011 		break;
7012 	}
7013 	case 'k':
7014 	case KEY_UP:
7015 	case CTRL('p'):
7016 		if (s->selected > 0) {
7017 			s->selected--;
7018 			break;
7019 		}
7020 		tree_scroll_up(s, 1);
7021 		if (s->selected_entry == NULL ||
7022 		    (s->tree == s->root && s->selected_entry ==
7023 		     got_object_tree_get_first_entry(s->tree)))
7024 			view->count = 0;
7025 		break;
7026 	case CTRL('u'):
7027 	case 'u':
7028 		nscroll /= 2;
7029 		/* FALL THROUGH */
7030 	case KEY_PPAGE:
7031 	case CTRL('b'):
7032 	case 'b':
7033 		if (s->tree == s->root) {
7034 			if (got_object_tree_get_first_entry(s->tree) ==
7035 			    s->first_displayed_entry)
7036 				s->selected -= MIN(s->selected, nscroll);
7037 		} else {
7038 			if (s->first_displayed_entry == NULL)
7039 				s->selected -= MIN(s->selected, nscroll);
7040 		}
7041 		tree_scroll_up(s, MAX(0, nscroll));
7042 		if (s->selected_entry == NULL ||
7043 		    (s->tree == s->root && s->selected_entry ==
7044 		     got_object_tree_get_first_entry(s->tree)))
7045 			view->count = 0;
7046 		break;
7047 	case 'j':
7048 	case KEY_DOWN:
7049 	case CTRL('n'):
7050 		if (s->selected < s->ndisplayed - 1) {
7051 			s->selected++;
7052 			break;
7053 		}
7054 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7055 		    == NULL) {
7056 			/* can't scroll any further */
7057 			view->count = 0;
7058 			break;
7059 		}
7060 		tree_scroll_down(view, 1);
7061 		break;
7062 	case CTRL('d'):
7063 	case 'd':
7064 		nscroll /= 2;
7065 		/* FALL THROUGH */
7066 	case KEY_NPAGE:
7067 	case CTRL('f'):
7068 	case 'f':
7069 	case ' ':
7070 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7071 		    == NULL) {
7072 			/* can't scroll any further; move cursor down */
7073 			if (s->selected < s->ndisplayed - 1)
7074 				s->selected += MIN(nscroll,
7075 				    s->ndisplayed - s->selected - 1);
7076 			else
7077 				view->count = 0;
7078 			break;
7079 		}
7080 		tree_scroll_down(view, nscroll);
7081 		break;
7082 	case KEY_ENTER:
7083 	case '\r':
7084 	case KEY_BACKSPACE:
7085 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7086 			struct tog_parent_tree *parent;
7087 			/* user selected '..' */
7088 			if (s->tree == s->root) {
7089 				view->count = 0;
7090 				break;
7091 			}
7092 			parent = TAILQ_FIRST(&s->parents);
7093 			TAILQ_REMOVE(&s->parents, parent,
7094 			    entry);
7095 			got_object_tree_close(s->tree);
7096 			s->tree = parent->tree;
7097 			s->first_displayed_entry =
7098 			    parent->first_displayed_entry;
7099 			s->selected_entry =
7100 			    parent->selected_entry;
7101 			s->selected = parent->selected;
7102 			if (s->selected > view->nlines - 3) {
7103 				err = offset_selection_down(view);
7104 				if (err)
7105 					break;
7106 			}
7107 			free(parent);
7108 		} else if (S_ISDIR(got_tree_entry_get_mode(
7109 		    s->selected_entry))) {
7110 			struct got_tree_object *subtree;
7111 			view->count = 0;
7112 			err = got_object_open_as_tree(&subtree, s->repo,
7113 			    got_tree_entry_get_id(s->selected_entry));
7114 			if (err)
7115 				break;
7116 			err = tree_view_visit_subtree(s, subtree);
7117 			if (err) {
7118 				got_object_tree_close(subtree);
7119 				break;
7120 			}
7121 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7122 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7123 		break;
7124 	case KEY_RESIZE:
7125 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7126 			s->selected = view->nlines - 4;
7127 		view->count = 0;
7128 		break;
7129 	default:
7130 		view->count = 0;
7131 		break;
7132 	}
7133 
7134 	return err;
7135 }
7136 
7137 __dead static void
7138 usage_tree(void)
7139 {
7140 	endwin();
7141 	fprintf(stderr,
7142 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7143 	    getprogname());
7144 	exit(1);
7145 }
7146 
7147 static const struct got_error *
7148 cmd_tree(int argc, char *argv[])
7149 {
7150 	const struct got_error *error;
7151 	struct got_repository *repo = NULL;
7152 	struct got_worktree *worktree = NULL;
7153 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7154 	struct got_object_id *commit_id = NULL;
7155 	struct got_commit_object *commit = NULL;
7156 	const char *commit_id_arg = NULL;
7157 	char *label = NULL;
7158 	struct got_reference *ref = NULL;
7159 	const char *head_ref_name = NULL;
7160 	int ch;
7161 	struct tog_view *view;
7162 	int *pack_fds = NULL;
7163 
7164 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7165 		switch (ch) {
7166 		case 'c':
7167 			commit_id_arg = optarg;
7168 			break;
7169 		case 'r':
7170 			repo_path = realpath(optarg, NULL);
7171 			if (repo_path == NULL)
7172 				return got_error_from_errno2("realpath",
7173 				    optarg);
7174 			break;
7175 		default:
7176 			usage_tree();
7177 			/* NOTREACHED */
7178 		}
7179 	}
7180 
7181 	argc -= optind;
7182 	argv += optind;
7183 
7184 	if (argc > 1)
7185 		usage_tree();
7186 
7187 	error = got_repo_pack_fds_open(&pack_fds);
7188 	if (error != NULL)
7189 		goto done;
7190 
7191 	if (repo_path == NULL) {
7192 		cwd = getcwd(NULL, 0);
7193 		if (cwd == NULL)
7194 			return got_error_from_errno("getcwd");
7195 		error = got_worktree_open(&worktree, cwd);
7196 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7197 			goto done;
7198 		if (worktree)
7199 			repo_path =
7200 			    strdup(got_worktree_get_repo_path(worktree));
7201 		else
7202 			repo_path = strdup(cwd);
7203 		if (repo_path == NULL) {
7204 			error = got_error_from_errno("strdup");
7205 			goto done;
7206 		}
7207 	}
7208 
7209 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7210 	if (error != NULL)
7211 		goto done;
7212 
7213 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7214 	    repo, worktree);
7215 	if (error)
7216 		goto done;
7217 
7218 	init_curses();
7219 
7220 	error = apply_unveil(got_repo_get_path(repo), NULL);
7221 	if (error)
7222 		goto done;
7223 
7224 	error = tog_load_refs(repo, 0);
7225 	if (error)
7226 		goto done;
7227 
7228 	if (commit_id_arg == NULL) {
7229 		error = got_repo_match_object_id(&commit_id, &label,
7230 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7231 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7232 		if (error)
7233 			goto done;
7234 		head_ref_name = label;
7235 	} else {
7236 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7237 		if (error == NULL)
7238 			head_ref_name = got_ref_get_name(ref);
7239 		else if (error->code != GOT_ERR_NOT_REF)
7240 			goto done;
7241 		error = got_repo_match_object_id(&commit_id, NULL,
7242 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7243 		if (error)
7244 			goto done;
7245 	}
7246 
7247 	error = got_object_open_as_commit(&commit, repo, commit_id);
7248 	if (error)
7249 		goto done;
7250 
7251 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7252 	if (view == NULL) {
7253 		error = got_error_from_errno("view_open");
7254 		goto done;
7255 	}
7256 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7257 	if (error)
7258 		goto done;
7259 	if (!got_path_is_root_dir(in_repo_path)) {
7260 		error = tree_view_walk_path(&view->state.tree, commit,
7261 		    in_repo_path);
7262 		if (error)
7263 			goto done;
7264 	}
7265 
7266 	if (worktree) {
7267 		/* Release work tree lock. */
7268 		got_worktree_close(worktree);
7269 		worktree = NULL;
7270 	}
7271 	error = view_loop(view);
7272 done:
7273 	free(repo_path);
7274 	free(cwd);
7275 	free(commit_id);
7276 	free(label);
7277 	if (ref)
7278 		got_ref_close(ref);
7279 	if (repo) {
7280 		const struct got_error *close_err = got_repo_close(repo);
7281 		if (error == NULL)
7282 			error = close_err;
7283 	}
7284 	if (pack_fds) {
7285 		const struct got_error *pack_err =
7286 		    got_repo_pack_fds_close(pack_fds);
7287 		if (error == NULL)
7288 			error = pack_err;
7289 	}
7290 	tog_free_refs();
7291 	return error;
7292 }
7293 
7294 static const struct got_error *
7295 ref_view_load_refs(struct tog_ref_view_state *s)
7296 {
7297 	struct got_reflist_entry *sre;
7298 	struct tog_reflist_entry *re;
7299 
7300 	s->nrefs = 0;
7301 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7302 		if (strncmp(got_ref_get_name(sre->ref),
7303 		    "refs/got/", 9) == 0 &&
7304 		    strncmp(got_ref_get_name(sre->ref),
7305 		    "refs/got/backup/", 16) != 0)
7306 			continue;
7307 
7308 		re = malloc(sizeof(*re));
7309 		if (re == NULL)
7310 			return got_error_from_errno("malloc");
7311 
7312 		re->ref = got_ref_dup(sre->ref);
7313 		if (re->ref == NULL)
7314 			return got_error_from_errno("got_ref_dup");
7315 		re->idx = s->nrefs++;
7316 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7317 	}
7318 
7319 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7320 	return NULL;
7321 }
7322 
7323 static void
7324 ref_view_free_refs(struct tog_ref_view_state *s)
7325 {
7326 	struct tog_reflist_entry *re;
7327 
7328 	while (!TAILQ_EMPTY(&s->refs)) {
7329 		re = TAILQ_FIRST(&s->refs);
7330 		TAILQ_REMOVE(&s->refs, re, entry);
7331 		got_ref_close(re->ref);
7332 		free(re);
7333 	}
7334 }
7335 
7336 static const struct got_error *
7337 open_ref_view(struct tog_view *view, struct got_repository *repo)
7338 {
7339 	const struct got_error *err = NULL;
7340 	struct tog_ref_view_state *s = &view->state.ref;
7341 
7342 	s->selected_entry = 0;
7343 	s->repo = repo;
7344 
7345 	TAILQ_INIT(&s->refs);
7346 	STAILQ_INIT(&s->colors);
7347 
7348 	err = ref_view_load_refs(s);
7349 	if (err)
7350 		return err;
7351 
7352 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7353 		err = add_color(&s->colors, "^refs/heads/",
7354 		    TOG_COLOR_REFS_HEADS,
7355 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7356 		if (err)
7357 			goto done;
7358 
7359 		err = add_color(&s->colors, "^refs/tags/",
7360 		    TOG_COLOR_REFS_TAGS,
7361 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7362 		if (err)
7363 			goto done;
7364 
7365 		err = add_color(&s->colors, "^refs/remotes/",
7366 		    TOG_COLOR_REFS_REMOTES,
7367 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7368 		if (err)
7369 			goto done;
7370 
7371 		err = add_color(&s->colors, "^refs/got/backup/",
7372 		    TOG_COLOR_REFS_BACKUP,
7373 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7374 		if (err)
7375 			goto done;
7376 	}
7377 
7378 	view->show = show_ref_view;
7379 	view->input = input_ref_view;
7380 	view->close = close_ref_view;
7381 	view->search_start = search_start_ref_view;
7382 	view->search_next = search_next_ref_view;
7383 done:
7384 	if (err)
7385 		free_colors(&s->colors);
7386 	return err;
7387 }
7388 
7389 static const struct got_error *
7390 close_ref_view(struct tog_view *view)
7391 {
7392 	struct tog_ref_view_state *s = &view->state.ref;
7393 
7394 	ref_view_free_refs(s);
7395 	free_colors(&s->colors);
7396 
7397 	return NULL;
7398 }
7399 
7400 static const struct got_error *
7401 resolve_reflist_entry(struct got_object_id **commit_id,
7402     struct tog_reflist_entry *re, struct got_repository *repo)
7403 {
7404 	const struct got_error *err = NULL;
7405 	struct got_object_id *obj_id;
7406 	struct got_tag_object *tag = NULL;
7407 	int obj_type;
7408 
7409 	*commit_id = NULL;
7410 
7411 	err = got_ref_resolve(&obj_id, repo, re->ref);
7412 	if (err)
7413 		return err;
7414 
7415 	err = got_object_get_type(&obj_type, repo, obj_id);
7416 	if (err)
7417 		goto done;
7418 
7419 	switch (obj_type) {
7420 	case GOT_OBJ_TYPE_COMMIT:
7421 		*commit_id = obj_id;
7422 		break;
7423 	case GOT_OBJ_TYPE_TAG:
7424 		err = got_object_open_as_tag(&tag, repo, obj_id);
7425 		if (err)
7426 			goto done;
7427 		free(obj_id);
7428 		err = got_object_get_type(&obj_type, repo,
7429 		    got_object_tag_get_object_id(tag));
7430 		if (err)
7431 			goto done;
7432 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7433 			err = got_error(GOT_ERR_OBJ_TYPE);
7434 			goto done;
7435 		}
7436 		*commit_id = got_object_id_dup(
7437 		    got_object_tag_get_object_id(tag));
7438 		if (*commit_id == NULL) {
7439 			err = got_error_from_errno("got_object_id_dup");
7440 			goto done;
7441 		}
7442 		break;
7443 	default:
7444 		err = got_error(GOT_ERR_OBJ_TYPE);
7445 		break;
7446 	}
7447 
7448 done:
7449 	if (tag)
7450 		got_object_tag_close(tag);
7451 	if (err) {
7452 		free(*commit_id);
7453 		*commit_id = NULL;
7454 	}
7455 	return err;
7456 }
7457 
7458 static const struct got_error *
7459 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7460     struct tog_reflist_entry *re, struct got_repository *repo)
7461 {
7462 	struct tog_view *log_view;
7463 	const struct got_error *err = NULL;
7464 	struct got_object_id *commit_id = NULL;
7465 
7466 	*new_view = NULL;
7467 
7468 	err = resolve_reflist_entry(&commit_id, re, repo);
7469 	if (err) {
7470 		if (err->code != GOT_ERR_OBJ_TYPE)
7471 			return err;
7472 		else
7473 			return NULL;
7474 	}
7475 
7476 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7477 	if (log_view == NULL) {
7478 		err = got_error_from_errno("view_open");
7479 		goto done;
7480 	}
7481 
7482 	err = open_log_view(log_view, commit_id, repo,
7483 	    got_ref_get_name(re->ref), "", 0);
7484 done:
7485 	if (err)
7486 		view_close(log_view);
7487 	else
7488 		*new_view = log_view;
7489 	free(commit_id);
7490 	return err;
7491 }
7492 
7493 static void
7494 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7495 {
7496 	struct tog_reflist_entry *re;
7497 	int i = 0;
7498 
7499 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7500 		return;
7501 
7502 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7503 	while (i++ < maxscroll) {
7504 		if (re == NULL)
7505 			break;
7506 		s->first_displayed_entry = re;
7507 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7508 	}
7509 }
7510 
7511 static const struct got_error *
7512 ref_scroll_down(struct tog_view *view, int maxscroll)
7513 {
7514 	struct tog_ref_view_state *s = &view->state.ref;
7515 	struct tog_reflist_entry *next, *last;
7516 	int n = 0;
7517 
7518 	if (s->first_displayed_entry)
7519 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7520 	else
7521 		next = TAILQ_FIRST(&s->refs);
7522 
7523 	last = s->last_displayed_entry;
7524 	while (next && n++ < maxscroll) {
7525 		if (last) {
7526 			s->last_displayed_entry = last;
7527 			last = TAILQ_NEXT(last, entry);
7528 		}
7529 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7530 			s->first_displayed_entry = next;
7531 			next = TAILQ_NEXT(next, entry);
7532 		}
7533 	}
7534 
7535 	return NULL;
7536 }
7537 
7538 static const struct got_error *
7539 search_start_ref_view(struct tog_view *view)
7540 {
7541 	struct tog_ref_view_state *s = &view->state.ref;
7542 
7543 	s->matched_entry = NULL;
7544 	return NULL;
7545 }
7546 
7547 static int
7548 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7549 {
7550 	regmatch_t regmatch;
7551 
7552 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7553 	    0) == 0;
7554 }
7555 
7556 static const struct got_error *
7557 search_next_ref_view(struct tog_view *view)
7558 {
7559 	struct tog_ref_view_state *s = &view->state.ref;
7560 	struct tog_reflist_entry *re = NULL;
7561 
7562 	if (!view->searching) {
7563 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7564 		return NULL;
7565 	}
7566 
7567 	if (s->matched_entry) {
7568 		if (view->searching == TOG_SEARCH_FORWARD) {
7569 			if (s->selected_entry)
7570 				re = TAILQ_NEXT(s->selected_entry, entry);
7571 			else
7572 				re = TAILQ_PREV(s->selected_entry,
7573 				    tog_reflist_head, entry);
7574 		} else {
7575 			if (s->selected_entry == NULL)
7576 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7577 			else
7578 				re = TAILQ_PREV(s->selected_entry,
7579 				    tog_reflist_head, entry);
7580 		}
7581 	} else {
7582 		if (s->selected_entry)
7583 			re = s->selected_entry;
7584 		else if (view->searching == TOG_SEARCH_FORWARD)
7585 			re = TAILQ_FIRST(&s->refs);
7586 		else
7587 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7588 	}
7589 
7590 	while (1) {
7591 		if (re == NULL) {
7592 			if (s->matched_entry == NULL) {
7593 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7594 				return NULL;
7595 			}
7596 			if (view->searching == TOG_SEARCH_FORWARD)
7597 				re = TAILQ_FIRST(&s->refs);
7598 			else
7599 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7600 		}
7601 
7602 		if (match_reflist_entry(re, &view->regex)) {
7603 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7604 			s->matched_entry = re;
7605 			break;
7606 		}
7607 
7608 		if (view->searching == TOG_SEARCH_FORWARD)
7609 			re = TAILQ_NEXT(re, entry);
7610 		else
7611 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7612 	}
7613 
7614 	if (s->matched_entry) {
7615 		s->first_displayed_entry = s->matched_entry;
7616 		s->selected = 0;
7617 	}
7618 
7619 	return NULL;
7620 }
7621 
7622 static const struct got_error *
7623 show_ref_view(struct tog_view *view)
7624 {
7625 	const struct got_error *err = NULL;
7626 	struct tog_ref_view_state *s = &view->state.ref;
7627 	struct tog_reflist_entry *re;
7628 	char *line = NULL;
7629 	wchar_t *wline;
7630 	struct tog_color *tc;
7631 	int width, n;
7632 	int limit = view->nlines;
7633 
7634 	werase(view->window);
7635 
7636 	s->ndisplayed = 0;
7637 	if (view_is_hsplit_top(view))
7638 		--limit;  /* border */
7639 
7640 	if (limit == 0)
7641 		return NULL;
7642 
7643 	re = s->first_displayed_entry;
7644 
7645 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7646 	    s->nrefs) == -1)
7647 		return got_error_from_errno("asprintf");
7648 
7649 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7650 	if (err) {
7651 		free(line);
7652 		return err;
7653 	}
7654 	if (view_needs_focus_indication(view))
7655 		wstandout(view->window);
7656 	waddwstr(view->window, wline);
7657 	while (width++ < view->ncols)
7658 		waddch(view->window, ' ');
7659 	if (view_needs_focus_indication(view))
7660 		wstandend(view->window);
7661 	free(wline);
7662 	wline = NULL;
7663 	free(line);
7664 	line = NULL;
7665 	if (--limit <= 0)
7666 		return NULL;
7667 
7668 	n = 0;
7669 	while (re && limit > 0) {
7670 		char *line = NULL;
7671 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7672 
7673 		if (s->show_date) {
7674 			struct got_commit_object *ci;
7675 			struct got_tag_object *tag;
7676 			struct got_object_id *id;
7677 			struct tm tm;
7678 			time_t t;
7679 
7680 			err = got_ref_resolve(&id, s->repo, re->ref);
7681 			if (err)
7682 				return err;
7683 			err = got_object_open_as_tag(&tag, s->repo, id);
7684 			if (err) {
7685 				if (err->code != GOT_ERR_OBJ_TYPE) {
7686 					free(id);
7687 					return err;
7688 				}
7689 				err = got_object_open_as_commit(&ci, s->repo,
7690 				    id);
7691 				if (err) {
7692 					free(id);
7693 					return err;
7694 				}
7695 				t = got_object_commit_get_committer_time(ci);
7696 				got_object_commit_close(ci);
7697 			} else {
7698 				t = got_object_tag_get_tagger_time(tag);
7699 				got_object_tag_close(tag);
7700 			}
7701 			free(id);
7702 			if (gmtime_r(&t, &tm) == NULL)
7703 				return got_error_from_errno("gmtime_r");
7704 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7705 				return got_error(GOT_ERR_NO_SPACE);
7706 		}
7707 		if (got_ref_is_symbolic(re->ref)) {
7708 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7709 			    ymd : "", got_ref_get_name(re->ref),
7710 			    got_ref_get_symref_target(re->ref)) == -1)
7711 				return got_error_from_errno("asprintf");
7712 		} else if (s->show_ids) {
7713 			struct got_object_id *id;
7714 			char *id_str;
7715 			err = got_ref_resolve(&id, s->repo, re->ref);
7716 			if (err)
7717 				return err;
7718 			err = got_object_id_str(&id_str, id);
7719 			if (err) {
7720 				free(id);
7721 				return err;
7722 			}
7723 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7724 			    got_ref_get_name(re->ref), id_str) == -1) {
7725 				err = got_error_from_errno("asprintf");
7726 				free(id);
7727 				free(id_str);
7728 				return err;
7729 			}
7730 			free(id);
7731 			free(id_str);
7732 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7733 		    got_ref_get_name(re->ref)) == -1)
7734 			return got_error_from_errno("asprintf");
7735 
7736 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7737 		    0, 0);
7738 		if (err) {
7739 			free(line);
7740 			return err;
7741 		}
7742 		if (n == s->selected) {
7743 			if (view->focussed)
7744 				wstandout(view->window);
7745 			s->selected_entry = re;
7746 		}
7747 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7748 		if (tc)
7749 			wattr_on(view->window,
7750 			    COLOR_PAIR(tc->colorpair), NULL);
7751 		waddwstr(view->window, wline);
7752 		if (tc)
7753 			wattr_off(view->window,
7754 			    COLOR_PAIR(tc->colorpair), NULL);
7755 		if (width < view->ncols - 1)
7756 			waddch(view->window, '\n');
7757 		if (n == s->selected && view->focussed)
7758 			wstandend(view->window);
7759 		free(line);
7760 		free(wline);
7761 		wline = NULL;
7762 		n++;
7763 		s->ndisplayed++;
7764 		s->last_displayed_entry = re;
7765 
7766 		limit--;
7767 		re = TAILQ_NEXT(re, entry);
7768 	}
7769 
7770 	view_border(view);
7771 	return err;
7772 }
7773 
7774 static const struct got_error *
7775 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7776     struct tog_reflist_entry *re, struct got_repository *repo)
7777 {
7778 	const struct got_error *err = NULL;
7779 	struct got_object_id *commit_id = NULL;
7780 	struct tog_view *tree_view;
7781 
7782 	*new_view = NULL;
7783 
7784 	err = resolve_reflist_entry(&commit_id, re, repo);
7785 	if (err) {
7786 		if (err->code != GOT_ERR_OBJ_TYPE)
7787 			return err;
7788 		else
7789 			return NULL;
7790 	}
7791 
7792 
7793 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7794 	if (tree_view == NULL) {
7795 		err = got_error_from_errno("view_open");
7796 		goto done;
7797 	}
7798 
7799 	err = open_tree_view(tree_view, commit_id,
7800 	    got_ref_get_name(re->ref), repo);
7801 	if (err)
7802 		goto done;
7803 
7804 	*new_view = tree_view;
7805 done:
7806 	free(commit_id);
7807 	return err;
7808 }
7809 
7810 static const struct got_error *
7811 ref_goto_line(struct tog_view *view, int nlines)
7812 {
7813 	const struct got_error		*err = NULL;
7814 	struct tog_ref_view_state	*s = &view->state.ref;
7815 	int				 g, idx = s->selected_entry->idx;
7816 
7817 	g = view->gline;
7818 	view->gline = 0;
7819 
7820 	if (g == 0)
7821 		g = 1;
7822 	else if (g > s->nrefs)
7823 		g = s->nrefs;
7824 
7825 	if (g >= s->first_displayed_entry->idx + 1 &&
7826 	    g <= s->last_displayed_entry->idx + 1 &&
7827 	    g - s->first_displayed_entry->idx - 1 < nlines) {
7828 		s->selected = g - s->first_displayed_entry->idx - 1;
7829 		return NULL;
7830 	}
7831 
7832 	if (idx + 1 < g) {
7833 		err = ref_scroll_down(view, g - idx - 1);
7834 		if (err)
7835 			return err;
7836 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
7837 		    s->first_displayed_entry->idx + s->selected < g &&
7838 		    s->selected < s->ndisplayed - 1)
7839 			s->selected = g - s->first_displayed_entry->idx - 1;
7840 	} else if (idx + 1 > g)
7841 		ref_scroll_up(s, idx - g + 1);
7842 
7843 	if (g < nlines && s->first_displayed_entry->idx == 0)
7844 		s->selected = g - 1;
7845 
7846 	return NULL;
7847 
7848 }
7849 
7850 static const struct got_error *
7851 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7852 {
7853 	const struct got_error *err = NULL;
7854 	struct tog_ref_view_state *s = &view->state.ref;
7855 	struct tog_reflist_entry *re;
7856 	int n, nscroll = view->nlines - 1;
7857 
7858 	if (view->gline)
7859 		return ref_goto_line(view, nscroll);
7860 
7861 	switch (ch) {
7862 	case 'i':
7863 		s->show_ids = !s->show_ids;
7864 		view->count = 0;
7865 		break;
7866 	case 'm':
7867 		s->show_date = !s->show_date;
7868 		view->count = 0;
7869 		break;
7870 	case 'o':
7871 		s->sort_by_date = !s->sort_by_date;
7872 		view->count = 0;
7873 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7874 		    got_ref_cmp_by_commit_timestamp_descending :
7875 		    tog_ref_cmp_by_name, s->repo);
7876 		if (err)
7877 			break;
7878 		got_reflist_object_id_map_free(tog_refs_idmap);
7879 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7880 		    &tog_refs, s->repo);
7881 		if (err)
7882 			break;
7883 		ref_view_free_refs(s);
7884 		err = ref_view_load_refs(s);
7885 		break;
7886 	case KEY_ENTER:
7887 	case '\r':
7888 		view->count = 0;
7889 		if (!s->selected_entry)
7890 			break;
7891 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7892 		break;
7893 	case 'T':
7894 		view->count = 0;
7895 		if (!s->selected_entry)
7896 			break;
7897 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
7898 		break;
7899 	case 'g':
7900 	case KEY_HOME:
7901 		s->selected = 0;
7902 		view->count = 0;
7903 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7904 		break;
7905 	case 'G':
7906 	case KEY_END: {
7907 		int eos = view->nlines - 1;
7908 
7909 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7910 			--eos;  /* border */
7911 		s->selected = 0;
7912 		view->count = 0;
7913 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7914 		for (n = 0; n < eos; n++) {
7915 			if (re == NULL)
7916 				break;
7917 			s->first_displayed_entry = re;
7918 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7919 		}
7920 		if (n > 0)
7921 			s->selected = n - 1;
7922 		break;
7923 	}
7924 	case 'k':
7925 	case KEY_UP:
7926 	case CTRL('p'):
7927 		if (s->selected > 0) {
7928 			s->selected--;
7929 			break;
7930 		}
7931 		ref_scroll_up(s, 1);
7932 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7933 			view->count = 0;
7934 		break;
7935 	case CTRL('u'):
7936 	case 'u':
7937 		nscroll /= 2;
7938 		/* FALL THROUGH */
7939 	case KEY_PPAGE:
7940 	case CTRL('b'):
7941 	case 'b':
7942 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7943 			s->selected -= MIN(nscroll, s->selected);
7944 		ref_scroll_up(s, MAX(0, nscroll));
7945 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7946 			view->count = 0;
7947 		break;
7948 	case 'j':
7949 	case KEY_DOWN:
7950 	case CTRL('n'):
7951 		if (s->selected < s->ndisplayed - 1) {
7952 			s->selected++;
7953 			break;
7954 		}
7955 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7956 			/* can't scroll any further */
7957 			view->count = 0;
7958 			break;
7959 		}
7960 		ref_scroll_down(view, 1);
7961 		break;
7962 	case CTRL('d'):
7963 	case 'd':
7964 		nscroll /= 2;
7965 		/* FALL THROUGH */
7966 	case KEY_NPAGE:
7967 	case CTRL('f'):
7968 	case 'f':
7969 	case ' ':
7970 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7971 			/* can't scroll any further; move cursor down */
7972 			if (s->selected < s->ndisplayed - 1)
7973 				s->selected += MIN(nscroll,
7974 				    s->ndisplayed - s->selected - 1);
7975 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7976 				s->selected += s->ndisplayed - s->selected - 1;
7977 			view->count = 0;
7978 			break;
7979 		}
7980 		ref_scroll_down(view, nscroll);
7981 		break;
7982 	case CTRL('l'):
7983 		view->count = 0;
7984 		tog_free_refs();
7985 		err = tog_load_refs(s->repo, s->sort_by_date);
7986 		if (err)
7987 			break;
7988 		ref_view_free_refs(s);
7989 		err = ref_view_load_refs(s);
7990 		break;
7991 	case KEY_RESIZE:
7992 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7993 			s->selected = view->nlines - 2;
7994 		break;
7995 	default:
7996 		view->count = 0;
7997 		break;
7998 	}
7999 
8000 	return err;
8001 }
8002 
8003 __dead static void
8004 usage_ref(void)
8005 {
8006 	endwin();
8007 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8008 	    getprogname());
8009 	exit(1);
8010 }
8011 
8012 static const struct got_error *
8013 cmd_ref(int argc, char *argv[])
8014 {
8015 	const struct got_error *error;
8016 	struct got_repository *repo = NULL;
8017 	struct got_worktree *worktree = NULL;
8018 	char *cwd = NULL, *repo_path = NULL;
8019 	int ch;
8020 	struct tog_view *view;
8021 	int *pack_fds = NULL;
8022 
8023 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8024 		switch (ch) {
8025 		case 'r':
8026 			repo_path = realpath(optarg, NULL);
8027 			if (repo_path == NULL)
8028 				return got_error_from_errno2("realpath",
8029 				    optarg);
8030 			break;
8031 		default:
8032 			usage_ref();
8033 			/* NOTREACHED */
8034 		}
8035 	}
8036 
8037 	argc -= optind;
8038 	argv += optind;
8039 
8040 	if (argc > 1)
8041 		usage_ref();
8042 
8043 	error = got_repo_pack_fds_open(&pack_fds);
8044 	if (error != NULL)
8045 		goto done;
8046 
8047 	if (repo_path == NULL) {
8048 		cwd = getcwd(NULL, 0);
8049 		if (cwd == NULL)
8050 			return got_error_from_errno("getcwd");
8051 		error = got_worktree_open(&worktree, cwd);
8052 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8053 			goto done;
8054 		if (worktree)
8055 			repo_path =
8056 			    strdup(got_worktree_get_repo_path(worktree));
8057 		else
8058 			repo_path = strdup(cwd);
8059 		if (repo_path == NULL) {
8060 			error = got_error_from_errno("strdup");
8061 			goto done;
8062 		}
8063 	}
8064 
8065 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8066 	if (error != NULL)
8067 		goto done;
8068 
8069 	init_curses();
8070 
8071 	error = apply_unveil(got_repo_get_path(repo), NULL);
8072 	if (error)
8073 		goto done;
8074 
8075 	error = tog_load_refs(repo, 0);
8076 	if (error)
8077 		goto done;
8078 
8079 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8080 	if (view == NULL) {
8081 		error = got_error_from_errno("view_open");
8082 		goto done;
8083 	}
8084 
8085 	error = open_ref_view(view, repo);
8086 	if (error)
8087 		goto done;
8088 
8089 	if (worktree) {
8090 		/* Release work tree lock. */
8091 		got_worktree_close(worktree);
8092 		worktree = NULL;
8093 	}
8094 	error = view_loop(view);
8095 done:
8096 	free(repo_path);
8097 	free(cwd);
8098 	if (repo) {
8099 		const struct got_error *close_err = got_repo_close(repo);
8100 		if (close_err)
8101 			error = close_err;
8102 	}
8103 	if (pack_fds) {
8104 		const struct got_error *pack_err =
8105 		    got_repo_pack_fds_close(pack_fds);
8106 		if (error == NULL)
8107 			error = pack_err;
8108 	}
8109 	tog_free_refs();
8110 	return error;
8111 }
8112 
8113 static const struct got_error *
8114 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8115     enum tog_view_type request, int y, int x)
8116 {
8117 	const struct got_error *err = NULL;
8118 
8119 	*new_view = NULL;
8120 
8121 	switch (request) {
8122 	case TOG_VIEW_DIFF:
8123 		if (view->type == TOG_VIEW_LOG) {
8124 			struct tog_log_view_state *s = &view->state.log;
8125 
8126 			err = open_diff_view_for_commit(new_view, y, x,
8127 			    s->selected_entry->commit, s->selected_entry->id,
8128 			    view, s->repo);
8129 		} else
8130 			return got_error_msg(GOT_ERR_NOT_IMPL,
8131 			    "parent/child view pair not supported");
8132 		break;
8133 	case TOG_VIEW_BLAME:
8134 		if (view->type == TOG_VIEW_TREE) {
8135 			struct tog_tree_view_state *s = &view->state.tree;
8136 
8137 			err = blame_tree_entry(new_view, y, x,
8138 			    s->selected_entry, &s->parents, s->commit_id,
8139 			    s->repo);
8140 		} else
8141 			return got_error_msg(GOT_ERR_NOT_IMPL,
8142 			    "parent/child view pair not supported");
8143 		break;
8144 	case TOG_VIEW_LOG:
8145 		if (view->type == TOG_VIEW_BLAME)
8146 			err = log_annotated_line(new_view, y, x,
8147 			    view->state.blame.repo, view->state.blame.id_to_log);
8148 		else if (view->type == TOG_VIEW_TREE)
8149 			err = log_selected_tree_entry(new_view, y, x,
8150 			    &view->state.tree);
8151 		else if (view->type == TOG_VIEW_REF)
8152 			err = log_ref_entry(new_view, y, x,
8153 			    view->state.ref.selected_entry,
8154 			    view->state.ref.repo);
8155 		else
8156 			return got_error_msg(GOT_ERR_NOT_IMPL,
8157 			    "parent/child view pair not supported");
8158 		break;
8159 	case TOG_VIEW_TREE:
8160 		if (view->type == TOG_VIEW_LOG)
8161 			err = browse_commit_tree(new_view, y, x,
8162 			    view->state.log.selected_entry,
8163 			    view->state.log.in_repo_path,
8164 			    view->state.log.head_ref_name,
8165 			    view->state.log.repo);
8166 		else if (view->type == TOG_VIEW_REF)
8167 			err = browse_ref_tree(new_view, y, x,
8168 			    view->state.ref.selected_entry,
8169 			    view->state.ref.repo);
8170 		else
8171 			return got_error_msg(GOT_ERR_NOT_IMPL,
8172 			    "parent/child view pair not supported");
8173 		break;
8174 	case TOG_VIEW_REF:
8175 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8176 		if (*new_view == NULL)
8177 			return got_error_from_errno("view_open");
8178 		if (view->type == TOG_VIEW_LOG)
8179 			err = open_ref_view(*new_view, view->state.log.repo);
8180 		else if (view->type == TOG_VIEW_TREE)
8181 			err = open_ref_view(*new_view, view->state.tree.repo);
8182 		else
8183 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8184 			    "parent/child view pair not supported");
8185 		if (err)
8186 			view_close(*new_view);
8187 		break;
8188 	default:
8189 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8190 	}
8191 
8192 	return err;
8193 }
8194 
8195 /*
8196  * If view was scrolled down to move the selected line into view when opening a
8197  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8198  */
8199 static void
8200 offset_selection_up(struct tog_view *view)
8201 {
8202 	switch (view->type) {
8203 	case TOG_VIEW_BLAME: {
8204 		struct tog_blame_view_state *s = &view->state.blame;
8205 		if (s->first_displayed_line == 1) {
8206 			s->selected_line = MAX(s->selected_line - view->offset,
8207 			    1);
8208 			break;
8209 		}
8210 		if (s->first_displayed_line > view->offset)
8211 			s->first_displayed_line -= view->offset;
8212 		else
8213 			s->first_displayed_line = 1;
8214 		s->selected_line += view->offset;
8215 		break;
8216 	}
8217 	case TOG_VIEW_LOG:
8218 		log_scroll_up(&view->state.log, view->offset);
8219 		view->state.log.selected += view->offset;
8220 		break;
8221 	case TOG_VIEW_REF:
8222 		ref_scroll_up(&view->state.ref, view->offset);
8223 		view->state.ref.selected += view->offset;
8224 		break;
8225 	case TOG_VIEW_TREE:
8226 		tree_scroll_up(&view->state.tree, view->offset);
8227 		view->state.tree.selected += view->offset;
8228 		break;
8229 	default:
8230 		break;
8231 	}
8232 
8233 	view->offset = 0;
8234 }
8235 
8236 /*
8237  * If the selected line is in the section of screen covered by the bottom split,
8238  * scroll down offset lines to move it into view and index its new position.
8239  */
8240 static const struct got_error *
8241 offset_selection_down(struct tog_view *view)
8242 {
8243 	const struct got_error	*err = NULL;
8244 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8245 	int			*selected = NULL;
8246 	int			 header, offset;
8247 
8248 	switch (view->type) {
8249 	case TOG_VIEW_BLAME: {
8250 		struct tog_blame_view_state *s = &view->state.blame;
8251 		header = 3;
8252 		scrolld = NULL;
8253 		if (s->selected_line > view->nlines - header) {
8254 			offset = abs(view->nlines - s->selected_line - header);
8255 			s->first_displayed_line += offset;
8256 			s->selected_line -= offset;
8257 			view->offset = offset;
8258 		}
8259 		break;
8260 	}
8261 	case TOG_VIEW_LOG: {
8262 		struct tog_log_view_state *s = &view->state.log;
8263 		scrolld = &log_scroll_down;
8264 		header = view_is_parent_view(view) ? 3 : 2;
8265 		selected = &s->selected;
8266 		break;
8267 	}
8268 	case TOG_VIEW_REF: {
8269 		struct tog_ref_view_state *s = &view->state.ref;
8270 		scrolld = &ref_scroll_down;
8271 		header = 3;
8272 		selected = &s->selected;
8273 		break;
8274 	}
8275 	case TOG_VIEW_TREE: {
8276 		struct tog_tree_view_state *s = &view->state.tree;
8277 		scrolld = &tree_scroll_down;
8278 		header = 5;
8279 		selected = &s->selected;
8280 		break;
8281 	}
8282 	default:
8283 		selected = NULL;
8284 		scrolld = NULL;
8285 		header = 0;
8286 		break;
8287 	}
8288 
8289 	if (selected && *selected > view->nlines - header) {
8290 		offset = abs(view->nlines - *selected - header);
8291 		view->offset = offset;
8292 		if (scrolld && offset) {
8293 			err = scrolld(view, offset);
8294 			*selected -= offset;
8295 		}
8296 	}
8297 
8298 	return err;
8299 }
8300 
8301 static void
8302 list_commands(FILE *fp)
8303 {
8304 	size_t i;
8305 
8306 	fprintf(fp, "commands:");
8307 	for (i = 0; i < nitems(tog_commands); i++) {
8308 		const struct tog_cmd *cmd = &tog_commands[i];
8309 		fprintf(fp, " %s", cmd->name);
8310 	}
8311 	fputc('\n', fp);
8312 }
8313 
8314 __dead static void
8315 usage(int hflag, int status)
8316 {
8317 	FILE *fp = (status == 0) ? stdout : stderr;
8318 
8319 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8320 	    getprogname());
8321 	if (hflag) {
8322 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8323 		list_commands(fp);
8324 	}
8325 	exit(status);
8326 }
8327 
8328 static char **
8329 make_argv(int argc, ...)
8330 {
8331 	va_list ap;
8332 	char **argv;
8333 	int i;
8334 
8335 	va_start(ap, argc);
8336 
8337 	argv = calloc(argc, sizeof(char *));
8338 	if (argv == NULL)
8339 		err(1, "calloc");
8340 	for (i = 0; i < argc; i++) {
8341 		argv[i] = strdup(va_arg(ap, char *));
8342 		if (argv[i] == NULL)
8343 			err(1, "strdup");
8344 	}
8345 
8346 	va_end(ap);
8347 	return argv;
8348 }
8349 
8350 /*
8351  * Try to convert 'tog path' into a 'tog log path' command.
8352  * The user could simply have mistyped the command rather than knowingly
8353  * provided a path. So check whether argv[0] can in fact be resolved
8354  * to a path in the HEAD commit and print a special error if not.
8355  * This hack is for mpi@ <3
8356  */
8357 static const struct got_error *
8358 tog_log_with_path(int argc, char *argv[])
8359 {
8360 	const struct got_error *error = NULL, *close_err;
8361 	const struct tog_cmd *cmd = NULL;
8362 	struct got_repository *repo = NULL;
8363 	struct got_worktree *worktree = NULL;
8364 	struct got_object_id *commit_id = NULL, *id = NULL;
8365 	struct got_commit_object *commit = NULL;
8366 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8367 	char *commit_id_str = NULL, **cmd_argv = NULL;
8368 	int *pack_fds = NULL;
8369 
8370 	cwd = getcwd(NULL, 0);
8371 	if (cwd == NULL)
8372 		return got_error_from_errno("getcwd");
8373 
8374 	error = got_repo_pack_fds_open(&pack_fds);
8375 	if (error != NULL)
8376 		goto done;
8377 
8378 	error = got_worktree_open(&worktree, cwd);
8379 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8380 		goto done;
8381 
8382 	if (worktree)
8383 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8384 	else
8385 		repo_path = strdup(cwd);
8386 	if (repo_path == NULL) {
8387 		error = got_error_from_errno("strdup");
8388 		goto done;
8389 	}
8390 
8391 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8392 	if (error != NULL)
8393 		goto done;
8394 
8395 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8396 	    repo, worktree);
8397 	if (error)
8398 		goto done;
8399 
8400 	error = tog_load_refs(repo, 0);
8401 	if (error)
8402 		goto done;
8403 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8404 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8405 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8406 	if (error)
8407 		goto done;
8408 
8409 	if (worktree) {
8410 		got_worktree_close(worktree);
8411 		worktree = NULL;
8412 	}
8413 
8414 	error = got_object_open_as_commit(&commit, repo, commit_id);
8415 	if (error)
8416 		goto done;
8417 
8418 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8419 	if (error) {
8420 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8421 			goto done;
8422 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8423 		    getprogname(), argv[0]);
8424 		usage(1, 1);
8425 		/* not reached */
8426 	}
8427 
8428 	error = got_object_id_str(&commit_id_str, commit_id);
8429 	if (error)
8430 		goto done;
8431 
8432 	cmd = &tog_commands[0]; /* log */
8433 	argc = 4;
8434 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8435 	error = cmd->cmd_main(argc, cmd_argv);
8436 done:
8437 	if (repo) {
8438 		close_err = got_repo_close(repo);
8439 		if (error == NULL)
8440 			error = close_err;
8441 	}
8442 	if (commit)
8443 		got_object_commit_close(commit);
8444 	if (worktree)
8445 		got_worktree_close(worktree);
8446 	if (pack_fds) {
8447 		const struct got_error *pack_err =
8448 		    got_repo_pack_fds_close(pack_fds);
8449 		if (error == NULL)
8450 			error = pack_err;
8451 	}
8452 	free(id);
8453 	free(commit_id_str);
8454 	free(commit_id);
8455 	free(cwd);
8456 	free(repo_path);
8457 	free(in_repo_path);
8458 	if (cmd_argv) {
8459 		int i;
8460 		for (i = 0; i < argc; i++)
8461 			free(cmd_argv[i]);
8462 		free(cmd_argv);
8463 	}
8464 	tog_free_refs();
8465 	return error;
8466 }
8467 
8468 int
8469 main(int argc, char *argv[])
8470 {
8471 	const struct got_error *error = NULL;
8472 	const struct tog_cmd *cmd = NULL;
8473 	int ch, hflag = 0, Vflag = 0;
8474 	char **cmd_argv = NULL;
8475 	static const struct option longopts[] = {
8476 	    { "version", no_argument, NULL, 'V' },
8477 	    { NULL, 0, NULL, 0}
8478 	};
8479 	char *diff_algo_str = NULL;
8480 
8481 	if (!isatty(STDIN_FILENO))
8482 		errx(1, "standard input is not a tty");
8483 
8484 	setlocale(LC_CTYPE, "");
8485 
8486 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8487 		switch (ch) {
8488 		case 'h':
8489 			hflag = 1;
8490 			break;
8491 		case 'V':
8492 			Vflag = 1;
8493 			break;
8494 		default:
8495 			usage(hflag, 1);
8496 			/* NOTREACHED */
8497 		}
8498 	}
8499 
8500 	argc -= optind;
8501 	argv += optind;
8502 	optind = 1;
8503 	optreset = 1;
8504 
8505 	if (Vflag) {
8506 		got_version_print_str();
8507 		return 0;
8508 	}
8509 
8510 #ifndef PROFILE
8511 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8512 	    NULL) == -1)
8513 		err(1, "pledge");
8514 #endif
8515 
8516 	if (argc == 0) {
8517 		if (hflag)
8518 			usage(hflag, 0);
8519 		/* Build an argument vector which runs a default command. */
8520 		cmd = &tog_commands[0];
8521 		argc = 1;
8522 		cmd_argv = make_argv(argc, cmd->name);
8523 	} else {
8524 		size_t i;
8525 
8526 		/* Did the user specify a command? */
8527 		for (i = 0; i < nitems(tog_commands); i++) {
8528 			if (strncmp(tog_commands[i].name, argv[0],
8529 			    strlen(argv[0])) == 0) {
8530 				cmd = &tog_commands[i];
8531 				break;
8532 			}
8533 		}
8534 	}
8535 
8536 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8537 	if (diff_algo_str) {
8538 		if (strcasecmp(diff_algo_str, "patience") == 0)
8539 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8540 		if (strcasecmp(diff_algo_str, "myers") == 0)
8541 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8542 	}
8543 
8544 	if (cmd == NULL) {
8545 		if (argc != 1)
8546 			usage(0, 1);
8547 		/* No command specified; try log with a path */
8548 		error = tog_log_with_path(argc, argv);
8549 	} else {
8550 		if (hflag)
8551 			cmd->cmd_usage();
8552 		else
8553 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8554 	}
8555 
8556 	endwin();
8557 	putchar('\n');
8558 	if (cmd_argv) {
8559 		int i;
8560 		for (i = 0; i < argc; i++)
8561 			free(cmd_argv[i]);
8562 		free(cmd_argv);
8563 	}
8564 
8565 	if (error && error->code != GOT_ERR_CANCELLED)
8566 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8567 	return 0;
8568 }