1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 };
112 
113 enum tog_view_mode {
114 	TOG_VIEW_SPLIT_NONE,
115 	TOG_VIEW_SPLIT_VERT,
116 	TOG_VIEW_SPLIT_HRZN
117 };
118 
119 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
120 
121 #define TOG_EOF_STRING	"(END)"
122 
123 struct commit_queue_entry {
124 	TAILQ_ENTRY(commit_queue_entry) entry;
125 	struct got_object_id *id;
126 	struct got_commit_object *commit;
127 	int idx;
128 };
129 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
130 struct commit_queue {
131 	int ncommits;
132 	struct commit_queue_head head;
133 };
134 
135 struct tog_color {
136 	STAILQ_ENTRY(tog_color) entry;
137 	regex_t regex;
138 	short colorpair;
139 };
140 STAILQ_HEAD(tog_colors, tog_color);
141 
142 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
143 static struct got_reflist_object_id_map *tog_refs_idmap;
144 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
145 
146 static const struct got_error *
147 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
148     struct got_reference* re2)
149 {
150 	const char *name1 = got_ref_get_name(re1);
151 	const char *name2 = got_ref_get_name(re2);
152 	int isbackup1, isbackup2;
153 
154 	/* Sort backup refs towards the bottom of the list. */
155 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
156 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
157 	if (!isbackup1 && isbackup2) {
158 		*cmp = -1;
159 		return NULL;
160 	} else if (isbackup1 && !isbackup2) {
161 		*cmp = 1;
162 		return NULL;
163 	}
164 
165 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
166 	return NULL;
167 }
168 
169 static const struct got_error *
170 tog_load_refs(struct got_repository *repo, int sort_by_date)
171 {
172 	const struct got_error *err;
173 
174 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
175 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
176 	    repo);
177 	if (err)
178 		return err;
179 
180 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
181 	    repo);
182 }
183 
184 static void
185 tog_free_refs(void)
186 {
187 	if (tog_refs_idmap) {
188 		got_reflist_object_id_map_free(tog_refs_idmap);
189 		tog_refs_idmap = NULL;
190 	}
191 	got_ref_list_free(&tog_refs);
192 }
193 
194 static const struct got_error *
195 add_color(struct tog_colors *colors, const char *pattern,
196     int idx, short color)
197 {
198 	const struct got_error *err = NULL;
199 	struct tog_color *tc;
200 	int regerr = 0;
201 
202 	if (idx < 1 || idx > COLOR_PAIRS - 1)
203 		return NULL;
204 
205 	init_pair(idx, color, -1);
206 
207 	tc = calloc(1, sizeof(*tc));
208 	if (tc == NULL)
209 		return got_error_from_errno("calloc");
210 	regerr = regcomp(&tc->regex, pattern,
211 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
212 	if (regerr) {
213 		static char regerr_msg[512];
214 		static char err_msg[512];
215 		regerror(regerr, &tc->regex, regerr_msg,
216 		    sizeof(regerr_msg));
217 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
218 		    regerr_msg);
219 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
220 		free(tc);
221 		return err;
222 	}
223 	tc->colorpair = idx;
224 	STAILQ_INSERT_HEAD(colors, tc, entry);
225 	return NULL;
226 }
227 
228 static void
229 free_colors(struct tog_colors *colors)
230 {
231 	struct tog_color *tc;
232 
233 	while (!STAILQ_EMPTY(colors)) {
234 		tc = STAILQ_FIRST(colors);
235 		STAILQ_REMOVE_HEAD(colors, entry);
236 		regfree(&tc->regex);
237 		free(tc);
238 	}
239 }
240 
241 static struct tog_color *
242 get_color(struct tog_colors *colors, int colorpair)
243 {
244 	struct tog_color *tc = NULL;
245 
246 	STAILQ_FOREACH(tc, colors, entry) {
247 		if (tc->colorpair == colorpair)
248 			return tc;
249 	}
250 
251 	return NULL;
252 }
253 
254 static int
255 default_color_value(const char *envvar)
256 {
257 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
258 		return COLOR_MAGENTA;
259 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
260 		return COLOR_CYAN;
261 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
262 		return COLOR_YELLOW;
263 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
264 		return COLOR_GREEN;
265 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
270 		return COLOR_CYAN;
271 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
274 		return COLOR_GREEN;
275 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
276 		return COLOR_CYAN;
277 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
278 		return COLOR_YELLOW;
279 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
282 		return COLOR_MAGENTA;
283 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
284 		return COLOR_YELLOW;
285 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
286 		return COLOR_CYAN;
287 
288 	return -1;
289 }
290 
291 static int
292 get_color_value(const char *envvar)
293 {
294 	const char *val = getenv(envvar);
295 
296 	if (val == NULL)
297 		return default_color_value(envvar);
298 
299 	if (strcasecmp(val, "black") == 0)
300 		return COLOR_BLACK;
301 	if (strcasecmp(val, "red") == 0)
302 		return COLOR_RED;
303 	if (strcasecmp(val, "green") == 0)
304 		return COLOR_GREEN;
305 	if (strcasecmp(val, "yellow") == 0)
306 		return COLOR_YELLOW;
307 	if (strcasecmp(val, "blue") == 0)
308 		return COLOR_BLUE;
309 	if (strcasecmp(val, "magenta") == 0)
310 		return COLOR_MAGENTA;
311 	if (strcasecmp(val, "cyan") == 0)
312 		return COLOR_CYAN;
313 	if (strcasecmp(val, "white") == 0)
314 		return COLOR_WHITE;
315 	if (strcasecmp(val, "default") == 0)
316 		return -1;
317 
318 	return default_color_value(envvar);
319 }
320 
321 struct tog_diff_view_state {
322 	struct got_object_id *id1, *id2;
323 	const char *label1, *label2;
324 	FILE *f, *f1, *f2;
325 	int fd1, fd2;
326 	int lineno;
327 	int first_displayed_line;
328 	int last_displayed_line;
329 	int eof;
330 	int diff_context;
331 	int ignore_whitespace;
332 	int force_text_diff;
333 	struct got_repository *repo;
334 	struct got_diff_line *lines;
335 	size_t nlines;
336 	int matched_line;
337 	int selected_line;
338 
339 	/* passed from log or blame view; may be NULL */
340 	struct tog_view *parent_view;
341 };
342 
343 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
344 static volatile sig_atomic_t tog_thread_error;
345 
346 struct tog_log_thread_args {
347 	pthread_cond_t need_commits;
348 	pthread_cond_t commit_loaded;
349 	int commits_needed;
350 	int load_all;
351 	struct got_commit_graph *graph;
352 	struct commit_queue *commits;
353 	const char *in_repo_path;
354 	struct got_object_id *start_id;
355 	struct got_repository *repo;
356 	int *pack_fds;
357 	int log_complete;
358 	sig_atomic_t *quit;
359 	struct commit_queue_entry **first_displayed_entry;
360 	struct commit_queue_entry **selected_entry;
361 	int *searching;
362 	int *search_next_done;
363 	regex_t *regex;
364 };
365 
366 struct tog_log_view_state {
367 	struct commit_queue commits;
368 	struct commit_queue_entry *first_displayed_entry;
369 	struct commit_queue_entry *last_displayed_entry;
370 	struct commit_queue_entry *selected_entry;
371 	int selected;
372 	char *in_repo_path;
373 	char *head_ref_name;
374 	int log_branches;
375 	struct got_repository *repo;
376 	struct got_object_id *start_id;
377 	sig_atomic_t quit;
378 	pthread_t thread;
379 	struct tog_log_thread_args thread_args;
380 	struct commit_queue_entry *matched_entry;
381 	struct commit_queue_entry *search_entry;
382 	struct tog_colors colors;
383 	int use_committer;
384 };
385 
386 #define TOG_COLOR_DIFF_MINUS		1
387 #define TOG_COLOR_DIFF_PLUS		2
388 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
389 #define TOG_COLOR_DIFF_META		4
390 #define TOG_COLOR_TREE_SUBMODULE	5
391 #define TOG_COLOR_TREE_SYMLINK		6
392 #define TOG_COLOR_TREE_DIRECTORY	7
393 #define TOG_COLOR_TREE_EXECUTABLE	8
394 #define TOG_COLOR_COMMIT		9
395 #define TOG_COLOR_AUTHOR		10
396 #define TOG_COLOR_DATE			11
397 #define TOG_COLOR_REFS_HEADS		12
398 #define TOG_COLOR_REFS_TAGS		13
399 #define TOG_COLOR_REFS_REMOTES		14
400 #define TOG_COLOR_REFS_BACKUP		15
401 
402 struct tog_blame_cb_args {
403 	struct tog_blame_line *lines; /* one per line */
404 	int nlines;
405 
406 	struct tog_view *view;
407 	struct got_object_id *commit_id;
408 	int *quit;
409 };
410 
411 struct tog_blame_thread_args {
412 	const char *path;
413 	struct got_repository *repo;
414 	struct tog_blame_cb_args *cb_args;
415 	int *complete;
416 	got_cancel_cb cancel_cb;
417 	void *cancel_arg;
418 };
419 
420 struct tog_blame {
421 	FILE *f;
422 	off_t filesize;
423 	struct tog_blame_line *lines;
424 	int nlines;
425 	off_t *line_offsets;
426 	pthread_t thread;
427 	struct tog_blame_thread_args thread_args;
428 	struct tog_blame_cb_args cb_args;
429 	const char *path;
430 	int *pack_fds;
431 };
432 
433 struct tog_blame_view_state {
434 	int first_displayed_line;
435 	int last_displayed_line;
436 	int selected_line;
437 	int last_diffed_line;
438 	int blame_complete;
439 	int eof;
440 	int done;
441 	struct got_object_id_queue blamed_commits;
442 	struct got_object_qid *blamed_commit;
443 	char *path;
444 	struct got_repository *repo;
445 	struct got_object_id *commit_id;
446 	struct got_object_id *id_to_log;
447 	struct tog_blame blame;
448 	int matched_line;
449 	struct tog_colors colors;
450 };
451 
452 struct tog_parent_tree {
453 	TAILQ_ENTRY(tog_parent_tree) entry;
454 	struct got_tree_object *tree;
455 	struct got_tree_entry *first_displayed_entry;
456 	struct got_tree_entry *selected_entry;
457 	int selected;
458 };
459 
460 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
461 
462 struct tog_tree_view_state {
463 	char *tree_label;
464 	struct got_object_id *commit_id;/* commit which this tree belongs to */
465 	struct got_tree_object *root;	/* the commit's root tree entry */
466 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
467 	struct got_tree_entry *first_displayed_entry;
468 	struct got_tree_entry *last_displayed_entry;
469 	struct got_tree_entry *selected_entry;
470 	int ndisplayed, selected, show_ids;
471 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
472 	char *head_ref_name;
473 	struct got_repository *repo;
474 	struct got_tree_entry *matched_entry;
475 	struct tog_colors colors;
476 };
477 
478 struct tog_reflist_entry {
479 	TAILQ_ENTRY(tog_reflist_entry) entry;
480 	struct got_reference *ref;
481 	int idx;
482 };
483 
484 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
485 
486 struct tog_ref_view_state {
487 	struct tog_reflist_head refs;
488 	struct tog_reflist_entry *first_displayed_entry;
489 	struct tog_reflist_entry *last_displayed_entry;
490 	struct tog_reflist_entry *selected_entry;
491 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
492 	struct got_repository *repo;
493 	struct tog_reflist_entry *matched_entry;
494 	struct tog_colors colors;
495 };
496 
497 /*
498  * We implement two types of views: parent views and child views.
499  *
500  * The 'Tab' key switches focus between a parent view and its child view.
501  * Child views are shown side-by-side to their parent view, provided
502  * there is enough screen estate.
503  *
504  * When a new view is opened from within a parent view, this new view
505  * becomes a child view of the parent view, replacing any existing child.
506  *
507  * When a new view is opened from within a child view, this new view
508  * becomes a parent view which will obscure the views below until the
509  * user quits the new parent view by typing 'q'.
510  *
511  * This list of views contains parent views only.
512  * Child views are only pointed to by their parent view.
513  */
514 TAILQ_HEAD(tog_view_list_head, tog_view);
515 
516 struct tog_view {
517 	TAILQ_ENTRY(tog_view) entry;
518 	WINDOW *window;
519 	PANEL *panel;
520 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
521 	int resized_y, resized_x; /* begin_y/x based on user resizing */
522 	int maxx, x; /* max column and current start column */
523 	int lines, cols; /* copies of LINES and COLS */
524 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
525 	int gline, hiline; /* navigate to and highlight this nG line */
526 	int ch, count; /* current keymap and count prefix */
527 	int resized; /* set when in a resize event */
528 	int focussed; /* Only set on one parent or child view at a time. */
529 	int dying;
530 	struct tog_view *parent;
531 	struct tog_view *child;
532 
533 	/*
534 	 * This flag is initially set on parent views when a new child view
535 	 * is created. It gets toggled when the 'Tab' key switches focus
536 	 * between parent and child.
537 	 * The flag indicates whether focus should be passed on to our child
538 	 * view if this parent view gets picked for focus after another parent
539 	 * view was closed. This prevents child views from losing focus in such
540 	 * situations.
541 	 */
542 	int focus_child;
543 
544 	enum tog_view_mode mode;
545 	/* type-specific state */
546 	enum tog_view_type type;
547 	union {
548 		struct tog_diff_view_state diff;
549 		struct tog_log_view_state log;
550 		struct tog_blame_view_state blame;
551 		struct tog_tree_view_state tree;
552 		struct tog_ref_view_state ref;
553 	} state;
554 
555 	const struct got_error *(*show)(struct tog_view *);
556 	const struct got_error *(*input)(struct tog_view **,
557 	    struct tog_view *, int);
558 	const struct got_error *(*reset)(struct tog_view *);
559 	const struct got_error *(*resize)(struct tog_view *, int);
560 	const struct got_error *(*close)(struct tog_view *);
561 
562 	const struct got_error *(*search_start)(struct tog_view *);
563 	const struct got_error *(*search_next)(struct tog_view *);
564 	int search_started;
565 	int searching;
566 #define TOG_SEARCH_FORWARD	1
567 #define TOG_SEARCH_BACKWARD	2
568 	int search_next_done;
569 #define TOG_SEARCH_HAVE_MORE	1
570 #define TOG_SEARCH_NO_MORE	2
571 #define TOG_SEARCH_HAVE_NONE	3
572 	regex_t regex;
573 	regmatch_t regmatch;
574 };
575 
576 static const struct got_error *open_diff_view(struct tog_view *,
577     struct got_object_id *, struct got_object_id *,
578     const char *, const char *, int, int, int, struct tog_view *,
579     struct got_repository *);
580 static const struct got_error *show_diff_view(struct tog_view *);
581 static const struct got_error *input_diff_view(struct tog_view **,
582     struct tog_view *, int);
583 static const struct got_error *reset_diff_view(struct tog_view *);
584 static const struct got_error* close_diff_view(struct tog_view *);
585 static const struct got_error *search_start_diff_view(struct tog_view *);
586 static const struct got_error *search_next_diff_view(struct tog_view *);
587 
588 static const struct got_error *open_log_view(struct tog_view *,
589     struct got_object_id *, struct got_repository *,
590     const char *, const char *, int);
591 static const struct got_error * show_log_view(struct tog_view *);
592 static const struct got_error *input_log_view(struct tog_view **,
593     struct tog_view *, int);
594 static const struct got_error *resize_log_view(struct tog_view *, int);
595 static const struct got_error *close_log_view(struct tog_view *);
596 static const struct got_error *search_start_log_view(struct tog_view *);
597 static const struct got_error *search_next_log_view(struct tog_view *);
598 
599 static const struct got_error *open_blame_view(struct tog_view *, char *,
600     struct got_object_id *, struct got_repository *);
601 static const struct got_error *show_blame_view(struct tog_view *);
602 static const struct got_error *input_blame_view(struct tog_view **,
603     struct tog_view *, int);
604 static const struct got_error *reset_blame_view(struct tog_view *);
605 static const struct got_error *close_blame_view(struct tog_view *);
606 static const struct got_error *search_start_blame_view(struct tog_view *);
607 static const struct got_error *search_next_blame_view(struct tog_view *);
608 
609 static const struct got_error *open_tree_view(struct tog_view *,
610     struct got_object_id *, const char *, struct got_repository *);
611 static const struct got_error *show_tree_view(struct tog_view *);
612 static const struct got_error *input_tree_view(struct tog_view **,
613     struct tog_view *, int);
614 static const struct got_error *close_tree_view(struct tog_view *);
615 static const struct got_error *search_start_tree_view(struct tog_view *);
616 static const struct got_error *search_next_tree_view(struct tog_view *);
617 
618 static const struct got_error *open_ref_view(struct tog_view *,
619     struct got_repository *);
620 static const struct got_error *show_ref_view(struct tog_view *);
621 static const struct got_error *input_ref_view(struct tog_view **,
622     struct tog_view *, int);
623 static const struct got_error *close_ref_view(struct tog_view *);
624 static const struct got_error *search_start_ref_view(struct tog_view *);
625 static const struct got_error *search_next_ref_view(struct tog_view *);
626 
627 static volatile sig_atomic_t tog_sigwinch_received;
628 static volatile sig_atomic_t tog_sigpipe_received;
629 static volatile sig_atomic_t tog_sigcont_received;
630 static volatile sig_atomic_t tog_sigint_received;
631 static volatile sig_atomic_t tog_sigterm_received;
632 
633 static void
634 tog_sigwinch(int signo)
635 {
636 	tog_sigwinch_received = 1;
637 }
638 
639 static void
640 tog_sigpipe(int signo)
641 {
642 	tog_sigpipe_received = 1;
643 }
644 
645 static void
646 tog_sigcont(int signo)
647 {
648 	tog_sigcont_received = 1;
649 }
650 
651 static void
652 tog_sigint(int signo)
653 {
654 	tog_sigint_received = 1;
655 }
656 
657 static void
658 tog_sigterm(int signo)
659 {
660 	tog_sigterm_received = 1;
661 }
662 
663 static int
664 tog_fatal_signal_received(void)
665 {
666 	return (tog_sigpipe_received ||
667 	    tog_sigint_received || tog_sigint_received);
668 }
669 
670 static const struct got_error *
671 view_close(struct tog_view *view)
672 {
673 	const struct got_error *err = NULL, *child_err = NULL;
674 
675 	if (view->child) {
676 		child_err = view_close(view->child);
677 		view->child = NULL;
678 	}
679 	if (view->close)
680 		err = view->close(view);
681 	if (view->panel)
682 		del_panel(view->panel);
683 	if (view->window)
684 		delwin(view->window);
685 	free(view);
686 	return err ? err : child_err;
687 }
688 
689 static struct tog_view *
690 view_open(int nlines, int ncols, int begin_y, int begin_x,
691     enum tog_view_type type)
692 {
693 	struct tog_view *view = calloc(1, sizeof(*view));
694 
695 	if (view == NULL)
696 		return NULL;
697 
698 	view->type = type;
699 	view->lines = LINES;
700 	view->cols = COLS;
701 	view->nlines = nlines ? nlines : LINES - begin_y;
702 	view->ncols = ncols ? ncols : COLS - begin_x;
703 	view->begin_y = begin_y;
704 	view->begin_x = begin_x;
705 	view->window = newwin(nlines, ncols, begin_y, begin_x);
706 	if (view->window == NULL) {
707 		view_close(view);
708 		return NULL;
709 	}
710 	view->panel = new_panel(view->window);
711 	if (view->panel == NULL ||
712 	    set_panel_userptr(view->panel, view) != OK) {
713 		view_close(view);
714 		return NULL;
715 	}
716 
717 	keypad(view->window, TRUE);
718 	return view;
719 }
720 
721 static int
722 view_split_begin_x(int begin_x)
723 {
724 	if (begin_x > 0 || COLS < 120)
725 		return 0;
726 	return (COLS - MAX(COLS / 2, 80));
727 }
728 
729 /* XXX Stub till we decide what to do. */
730 static int
731 view_split_begin_y(int lines)
732 {
733 	return lines * HSPLIT_SCALE;
734 }
735 
736 static const struct got_error *view_resize(struct tog_view *);
737 
738 static const struct got_error *
739 view_splitscreen(struct tog_view *view)
740 {
741 	const struct got_error *err = NULL;
742 
743 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
744 		if (view->resized_y && view->resized_y < view->lines)
745 			view->begin_y = view->resized_y;
746 		else
747 			view->begin_y = view_split_begin_y(view->nlines);
748 		view->begin_x = 0;
749 	} else if (!view->resized) {
750 		if (view->resized_x && view->resized_x < view->cols - 1 &&
751 		    view->cols > 119)
752 			view->begin_x = view->resized_x;
753 		else
754 			view->begin_x = view_split_begin_x(0);
755 		view->begin_y = 0;
756 	}
757 	view->nlines = LINES - view->begin_y;
758 	view->ncols = COLS - view->begin_x;
759 	view->lines = LINES;
760 	view->cols = COLS;
761 	err = view_resize(view);
762 	if (err)
763 		return err;
764 
765 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
766 		view->parent->nlines = view->begin_y;
767 
768 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
769 		return got_error_from_errno("mvwin");
770 
771 	return NULL;
772 }
773 
774 static const struct got_error *
775 view_fullscreen(struct tog_view *view)
776 {
777 	const struct got_error *err = NULL;
778 
779 	view->begin_x = 0;
780 	view->begin_y = view->resized ? view->begin_y : 0;
781 	view->nlines = view->resized ? view->nlines : LINES;
782 	view->ncols = COLS;
783 	view->lines = LINES;
784 	view->cols = COLS;
785 	err = view_resize(view);
786 	if (err)
787 		return err;
788 
789 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
790 		return got_error_from_errno("mvwin");
791 
792 	return NULL;
793 }
794 
795 static int
796 view_is_parent_view(struct tog_view *view)
797 {
798 	return view->parent == NULL;
799 }
800 
801 static int
802 view_is_splitscreen(struct tog_view *view)
803 {
804 	return view->begin_x > 0 || view->begin_y > 0;
805 }
806 
807 static int
808 view_is_fullscreen(struct tog_view *view)
809 {
810 	return view->nlines == LINES && view->ncols == COLS;
811 }
812 
813 static int
814 view_is_hsplit_top(struct tog_view *view)
815 {
816 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
817 	    view_is_splitscreen(view->child);
818 }
819 
820 static void
821 view_border(struct tog_view *view)
822 {
823 	PANEL *panel;
824 	const struct tog_view *view_above;
825 
826 	if (view->parent)
827 		return view_border(view->parent);
828 
829 	panel = panel_above(view->panel);
830 	if (panel == NULL)
831 		return;
832 
833 	view_above = panel_userptr(panel);
834 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
835 		mvwhline(view->window, view_above->begin_y - 1,
836 		    view->begin_x, got_locale_is_utf8() ?
837 		    ACS_HLINE : '-', view->ncols);
838 	else
839 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
840 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
841 }
842 
843 static const struct got_error *view_init_hsplit(struct tog_view *, int);
844 static const struct got_error *request_log_commits(struct tog_view *);
845 static const struct got_error *offset_selection_down(struct tog_view *);
846 static void offset_selection_up(struct tog_view *);
847 static void view_get_split(struct tog_view *, int *, int *);
848 
849 static const struct got_error *
850 view_resize(struct tog_view *view)
851 {
852 	const struct got_error	*err = NULL;
853 	int			 dif, nlines, ncols;
854 
855 	dif = LINES - view->lines;  /* line difference */
856 
857 	if (view->lines > LINES)
858 		nlines = view->nlines - (view->lines - LINES);
859 	else
860 		nlines = view->nlines + (LINES - view->lines);
861 	if (view->cols > COLS)
862 		ncols = view->ncols - (view->cols - COLS);
863 	else
864 		ncols = view->ncols + (COLS - view->cols);
865 
866 	if (view->child) {
867 		int hs = view->child->begin_y;
868 
869 		if (!view_is_fullscreen(view))
870 			view->child->begin_x = view_split_begin_x(view->begin_x);
871 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
872 		    view->child->begin_x == 0) {
873 			ncols = COLS;
874 
875 			view_fullscreen(view->child);
876 			if (view->child->focussed)
877 				show_panel(view->child->panel);
878 			else
879 				show_panel(view->panel);
880 		} else {
881 			ncols = view->child->begin_x;
882 
883 			view_splitscreen(view->child);
884 			show_panel(view->child->panel);
885 		}
886 		/*
887 		 * XXX This is ugly and needs to be moved into the above
888 		 * logic but "works" for now and my attempts at moving it
889 		 * break either 'tab' or 'F' key maps in horizontal splits.
890 		 */
891 		if (hs) {
892 			err = view_splitscreen(view->child);
893 			if (err)
894 				return err;
895 			if (dif < 0) { /* top split decreased */
896 				err = offset_selection_down(view);
897 				if (err)
898 					return err;
899 			}
900 			view_border(view);
901 			update_panels();
902 			doupdate();
903 			show_panel(view->child->panel);
904 			nlines = view->nlines;
905 		}
906 	} else if (view->parent == NULL)
907 		ncols = COLS;
908 
909 	if (view->resize && dif > 0) {
910 		err = view->resize(view, dif);
911 		if (err)
912 			return err;
913 	}
914 
915 	if (wresize(view->window, nlines, ncols) == ERR)
916 		return got_error_from_errno("wresize");
917 	if (replace_panel(view->panel, view->window) == ERR)
918 		return got_error_from_errno("replace_panel");
919 	wclear(view->window);
920 
921 	view->nlines = nlines;
922 	view->ncols = ncols;
923 	view->lines = LINES;
924 	view->cols = COLS;
925 
926 	return NULL;
927 }
928 
929 static const struct got_error *
930 resize_log_view(struct tog_view *view, int increase)
931 {
932 	struct tog_log_view_state	*s = &view->state.log;
933 	const struct got_error		*err = NULL;
934 	int				 n = 0;
935 
936 	if (s->selected_entry)
937 		n = s->selected_entry->idx + view->lines - s->selected;
938 
939 	/*
940 	 * Request commits to account for the increased
941 	 * height so we have enough to populate the view.
942 	 */
943 	if (s->commits.ncommits < n) {
944 		view->nscrolled = n - s->commits.ncommits + increase + 1;
945 		err = request_log_commits(view);
946 	}
947 
948 	return err;
949 }
950 
951 static void
952 view_adjust_offset(struct tog_view *view, int n)
953 {
954 	if (n == 0)
955 		return;
956 
957 	if (view->parent && view->parent->offset) {
958 		if (view->parent->offset + n >= 0)
959 			view->parent->offset += n;
960 		else
961 			view->parent->offset = 0;
962 	} else if (view->offset) {
963 		if (view->offset - n >= 0)
964 			view->offset -= n;
965 		else
966 			view->offset = 0;
967 	}
968 }
969 
970 static const struct got_error *
971 view_resize_split(struct tog_view *view, int resize)
972 {
973 	const struct got_error	*err = NULL;
974 	struct tog_view		*v = NULL;
975 
976 	if (view->parent)
977 		v = view->parent;
978 	else
979 		v = view;
980 
981 	if (!v->child || !view_is_splitscreen(v->child))
982 		return NULL;
983 
984 	v->resized = v->child->resized = resize;  /* lock for resize event */
985 
986 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
987 		if (v->child->resized_y)
988 			v->child->begin_y = v->child->resized_y;
989 		if (view->parent)
990 			v->child->begin_y -= resize;
991 		else
992 			v->child->begin_y += resize;
993 		if (v->child->begin_y < 3) {
994 			view->count = 0;
995 			v->child->begin_y = 3;
996 		} else if (v->child->begin_y > LINES - 1) {
997 			view->count = 0;
998 			v->child->begin_y = LINES - 1;
999 		}
1000 		v->ncols = COLS;
1001 		v->child->ncols = COLS;
1002 		view_adjust_offset(view, resize);
1003 		err = view_init_hsplit(v, v->child->begin_y);
1004 		if (err)
1005 			return err;
1006 		v->child->resized_y = v->child->begin_y;
1007 	} else {
1008 		if (v->child->resized_x)
1009 			v->child->begin_x = v->child->resized_x;
1010 		if (view->parent)
1011 			v->child->begin_x -= resize;
1012 		else
1013 			v->child->begin_x += resize;
1014 		if (v->child->begin_x < 11) {
1015 			view->count = 0;
1016 			v->child->begin_x = 11;
1017 		} else if (v->child->begin_x > COLS - 1) {
1018 			view->count = 0;
1019 			v->child->begin_x = COLS - 1;
1020 		}
1021 		v->child->resized_x = v->child->begin_x;
1022 	}
1023 
1024 	v->child->mode = v->mode;
1025 	v->child->nlines = v->lines - v->child->begin_y;
1026 	v->child->ncols = v->cols - v->child->begin_x;
1027 	v->focus_child = 1;
1028 
1029 	err = view_fullscreen(v);
1030 	if (err)
1031 		return err;
1032 	err = view_splitscreen(v->child);
1033 	if (err)
1034 		return err;
1035 
1036 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1037 		err = offset_selection_down(v->child);
1038 		if (err)
1039 			return err;
1040 	}
1041 
1042 	if (v->resize)
1043 		err = v->resize(v, 0);
1044 	else if (v->child->resize)
1045 		err = v->child->resize(v->child, 0);
1046 
1047 	v->resized = v->child->resized = 0;
1048 
1049 	return err;
1050 }
1051 
1052 static void
1053 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1054 {
1055 	struct tog_view *v = src->child ? src->child : src;
1056 
1057 	dst->resized_x = v->resized_x;
1058 	dst->resized_y = v->resized_y;
1059 }
1060 
1061 static const struct got_error *
1062 view_close_child(struct tog_view *view)
1063 {
1064 	const struct got_error *err = NULL;
1065 
1066 	if (view->child == NULL)
1067 		return NULL;
1068 
1069 	err = view_close(view->child);
1070 	view->child = NULL;
1071 	return err;
1072 }
1073 
1074 static const struct got_error *
1075 view_set_child(struct tog_view *view, struct tog_view *child)
1076 {
1077 	const struct got_error *err = NULL;
1078 
1079 	view->child = child;
1080 	child->parent = view;
1081 
1082 	err = view_resize(view);
1083 	if (err)
1084 		return err;
1085 
1086 	if (view->child->resized_x || view->child->resized_y)
1087 		err = view_resize_split(view, 0);
1088 
1089 	return err;
1090 }
1091 
1092 static const struct got_error *view_dispatch_request(struct tog_view **,
1093     struct tog_view *, enum tog_view_type, int, int);
1094 
1095 static const struct got_error *
1096 view_request_new(struct tog_view **requested, struct tog_view *view,
1097     enum tog_view_type request)
1098 {
1099 	struct tog_view		*new_view = NULL;
1100 	const struct got_error	*err;
1101 	int			 y = 0, x = 0;
1102 
1103 	*requested = NULL;
1104 
1105 	if (view_is_parent_view(view))
1106 		view_get_split(view, &y, &x);
1107 
1108 	err = view_dispatch_request(&new_view, view, request, y, x);
1109 	if (err)
1110 		return err;
1111 
1112 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1113 		err = view_init_hsplit(view, y);
1114 		if (err)
1115 			return err;
1116 	}
1117 
1118 	view->focussed = 0;
1119 	new_view->focussed = 1;
1120 	new_view->mode = view->mode;
1121 	new_view->nlines = view->lines - y;
1122 
1123 	if (view_is_parent_view(view)) {
1124 		view_transfer_size(new_view, view);
1125 		err = view_close_child(view);
1126 		if (err)
1127 			return err;
1128 		err = view_set_child(view, new_view);
1129 		if (err)
1130 			return err;
1131 		view->focus_child = 1;
1132 	} else
1133 		*requested = new_view;
1134 
1135 	return NULL;
1136 }
1137 
1138 static void
1139 tog_resizeterm(void)
1140 {
1141 	int cols, lines;
1142 	struct winsize size;
1143 
1144 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1145 		cols = 80;     /* Default */
1146 		lines = 24;
1147 	} else {
1148 		cols = size.ws_col;
1149 		lines = size.ws_row;
1150 	}
1151 	resize_term(lines, cols);
1152 }
1153 
1154 static const struct got_error *
1155 view_search_start(struct tog_view *view)
1156 {
1157 	const struct got_error *err = NULL;
1158 	struct tog_view *v = view;
1159 	char pattern[1024];
1160 	int ret;
1161 
1162 	if (view->search_started) {
1163 		regfree(&view->regex);
1164 		view->searching = 0;
1165 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1166 	}
1167 	view->search_started = 0;
1168 
1169 	if (view->nlines < 1)
1170 		return NULL;
1171 
1172 	if (view_is_hsplit_top(view))
1173 		v = view->child;
1174 
1175 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1176 	wclrtoeol(v->window);
1177 
1178 	nodelay(view->window, FALSE);  /* block for search term input */
1179 	nocbreak();
1180 	echo();
1181 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1182 	wrefresh(v->window);
1183 	cbreak();
1184 	noecho();
1185 	nodelay(view->window, TRUE);
1186 	if (ret == ERR)
1187 		return NULL;
1188 
1189 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1190 		err = view->search_start(view);
1191 		if (err) {
1192 			regfree(&view->regex);
1193 			return err;
1194 		}
1195 		view->search_started = 1;
1196 		view->searching = TOG_SEARCH_FORWARD;
1197 		view->search_next_done = 0;
1198 		view->search_next(view);
1199 	}
1200 
1201 	return NULL;
1202 }
1203 
1204 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1205 static const struct got_error *
1206 switch_split(struct tog_view *view)
1207 {
1208 	const struct got_error	*err = NULL;
1209 	struct tog_view		*v = NULL;
1210 
1211 	if (view->parent)
1212 		v = view->parent;
1213 	else
1214 		v = view;
1215 
1216 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1217 		v->mode = TOG_VIEW_SPLIT_VERT;
1218 	else
1219 		v->mode = TOG_VIEW_SPLIT_HRZN;
1220 
1221 	if (!v->child)
1222 		return NULL;
1223 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1224 		v->mode = TOG_VIEW_SPLIT_NONE;
1225 
1226 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1227 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1228 		v->child->begin_y = v->child->resized_y;
1229 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1230 		v->child->begin_x = v->child->resized_x;
1231 
1232 
1233 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1234 		v->ncols = COLS;
1235 		v->child->ncols = COLS;
1236 		v->child->nscrolled = LINES - v->child->nlines;
1237 
1238 		err = view_init_hsplit(v, v->child->begin_y);
1239 		if (err)
1240 			return err;
1241 	}
1242 	v->child->mode = v->mode;
1243 	v->child->nlines = v->lines - v->child->begin_y;
1244 	v->focus_child = 1;
1245 
1246 	err = view_fullscreen(v);
1247 	if (err)
1248 		return err;
1249 	err = view_splitscreen(v->child);
1250 	if (err)
1251 		return err;
1252 
1253 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1254 		v->mode = TOG_VIEW_SPLIT_VERT;
1255 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1256 		err = offset_selection_down(v);
1257 		if (err)
1258 			return err;
1259 		err = offset_selection_down(v->child);
1260 		if (err)
1261 			return err;
1262 	} else {
1263 		offset_selection_up(v);
1264 		offset_selection_up(v->child);
1265 	}
1266 	if (v->resize)
1267 		err = v->resize(v, 0);
1268 	else if (v->child->resize)
1269 		err = v->child->resize(v->child, 0);
1270 
1271 	return err;
1272 }
1273 
1274 /*
1275  * Compute view->count from numeric input. Assign total to view->count and
1276  * return first non-numeric key entered.
1277  */
1278 static int
1279 get_compound_key(struct tog_view *view, int c)
1280 {
1281 	struct tog_view	*v = view;
1282 	int		 x, n = 0;
1283 
1284 	if (view_is_hsplit_top(view))
1285 		v = view->child;
1286 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1287 		v = view->parent;
1288 
1289 	view->count = 0;
1290 	cbreak();  /* block for input */
1291 	nodelay(view->window, FALSE);
1292 	wmove(v->window, v->nlines - 1, 0);
1293 	wclrtoeol(v->window);
1294 	waddch(v->window, ':');
1295 
1296 	do {
1297 		x = getcurx(v->window);
1298 		if (x != ERR && x < view->ncols) {
1299 			waddch(v->window, c);
1300 			wrefresh(v->window);
1301 		}
1302 
1303 		/*
1304 		 * Don't overflow. Max valid request should be the greatest
1305 		 * between the longest and total lines; cap at 10 million.
1306 		 */
1307 		if (n >= 9999999)
1308 			n = 9999999;
1309 		else
1310 			n = n * 10 + (c - '0');
1311 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1312 
1313 	if (c == 'G' || c == 'g') {	/* nG key map */
1314 		view->gline = view->hiline = n;
1315 		n = 0;
1316 		c = 0;
1317 	}
1318 
1319 	/* Massage excessive or inapplicable values at the input handler. */
1320 	view->count = n;
1321 
1322 	return c;
1323 }
1324 
1325 static const struct got_error *
1326 view_input(struct tog_view **new, int *done, struct tog_view *view,
1327     struct tog_view_list_head *views)
1328 {
1329 	const struct got_error *err = NULL;
1330 	struct tog_view *v;
1331 	int ch, errcode;
1332 
1333 	*new = NULL;
1334 
1335 	/* Clear "no matches" indicator. */
1336 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1337 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1338 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1339 		view->count = 0;
1340 	}
1341 
1342 	if (view->searching && !view->search_next_done) {
1343 		errcode = pthread_mutex_unlock(&tog_mutex);
1344 		if (errcode)
1345 			return got_error_set_errno(errcode,
1346 			    "pthread_mutex_unlock");
1347 		sched_yield();
1348 		errcode = pthread_mutex_lock(&tog_mutex);
1349 		if (errcode)
1350 			return got_error_set_errno(errcode,
1351 			    "pthread_mutex_lock");
1352 		view->search_next(view);
1353 		return NULL;
1354 	}
1355 
1356 	/* Allow threads to make progress while we are waiting for input. */
1357 	errcode = pthread_mutex_unlock(&tog_mutex);
1358 	if (errcode)
1359 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1360 	/* If we have an unfinished count, let C-g or backspace abort. */
1361 	if (view->count && --view->count) {
1362 		cbreak();
1363 		nodelay(view->window, TRUE);
1364 		ch = wgetch(view->window);
1365 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1366 			view->count = 0;
1367 		else
1368 			ch = view->ch;
1369 	} else {
1370 		ch = wgetch(view->window);
1371 		if (ch >= '1' && ch  <= '9')
1372 			view->ch = ch = get_compound_key(view, ch);
1373 	}
1374 	if (view->hiline && ch != ERR && ch != 0)
1375 		view->hiline = 0;  /* key pressed, clear line highlight */
1376 	nodelay(view->window, TRUE);
1377 	errcode = pthread_mutex_lock(&tog_mutex);
1378 	if (errcode)
1379 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1380 
1381 	if (tog_sigwinch_received || tog_sigcont_received) {
1382 		tog_resizeterm();
1383 		tog_sigwinch_received = 0;
1384 		tog_sigcont_received = 0;
1385 		TAILQ_FOREACH(v, views, entry) {
1386 			err = view_resize(v);
1387 			if (err)
1388 				return err;
1389 			err = v->input(new, v, KEY_RESIZE);
1390 			if (err)
1391 				return err;
1392 			if (v->child) {
1393 				err = view_resize(v->child);
1394 				if (err)
1395 					return err;
1396 				err = v->child->input(new, v->child,
1397 				    KEY_RESIZE);
1398 				if (err)
1399 					return err;
1400 				if (v->child->resized_x || v->child->resized_y) {
1401 					err = view_resize_split(v, 0);
1402 					if (err)
1403 						return err;
1404 				}
1405 			}
1406 		}
1407 	}
1408 
1409 	switch (ch) {
1410 	case '\t':
1411 		view->count = 0;
1412 		if (view->child) {
1413 			view->focussed = 0;
1414 			view->child->focussed = 1;
1415 			view->focus_child = 1;
1416 		} else if (view->parent) {
1417 			view->focussed = 0;
1418 			view->parent->focussed = 1;
1419 			view->parent->focus_child = 0;
1420 			if (!view_is_splitscreen(view)) {
1421 				if (view->parent->resize) {
1422 					err = view->parent->resize(view->parent,
1423 					    0);
1424 					if (err)
1425 						return err;
1426 				}
1427 				offset_selection_up(view->parent);
1428 				err = view_fullscreen(view->parent);
1429 				if (err)
1430 					return err;
1431 			}
1432 		}
1433 		break;
1434 	case 'q':
1435 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1436 			if (view->parent->resize) {
1437 				/* might need more commits to fill fullscreen */
1438 				err = view->parent->resize(view->parent, 0);
1439 				if (err)
1440 					break;
1441 			}
1442 			offset_selection_up(view->parent);
1443 		}
1444 		err = view->input(new, view, ch);
1445 		view->dying = 1;
1446 		break;
1447 	case 'Q':
1448 		*done = 1;
1449 		break;
1450 	case 'F':
1451 		view->count = 0;
1452 		if (view_is_parent_view(view)) {
1453 			if (view->child == NULL)
1454 				break;
1455 			if (view_is_splitscreen(view->child)) {
1456 				view->focussed = 0;
1457 				view->child->focussed = 1;
1458 				err = view_fullscreen(view->child);
1459 			} else {
1460 				err = view_splitscreen(view->child);
1461 				if (!err)
1462 					err = view_resize_split(view, 0);
1463 			}
1464 			if (err)
1465 				break;
1466 			err = view->child->input(new, view->child,
1467 			    KEY_RESIZE);
1468 		} else {
1469 			if (view_is_splitscreen(view)) {
1470 				view->parent->focussed = 0;
1471 				view->focussed = 1;
1472 				err = view_fullscreen(view);
1473 			} else {
1474 				err = view_splitscreen(view);
1475 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1476 					err = view_resize(view->parent);
1477 				if (!err)
1478 					err = view_resize_split(view, 0);
1479 			}
1480 			if (err)
1481 				break;
1482 			err = view->input(new, view, KEY_RESIZE);
1483 		}
1484 		if (err)
1485 			break;
1486 		if (view->resize) {
1487 			err = view->resize(view, 0);
1488 			if (err)
1489 				break;
1490 		}
1491 		if (view->parent)
1492 			err = offset_selection_down(view->parent);
1493 		if (!err)
1494 			err = offset_selection_down(view);
1495 		break;
1496 	case 'S':
1497 		view->count = 0;
1498 		err = switch_split(view);
1499 		break;
1500 	case '-':
1501 		err = view_resize_split(view, -1);
1502 		break;
1503 	case '+':
1504 		err = view_resize_split(view, 1);
1505 		break;
1506 	case KEY_RESIZE:
1507 		break;
1508 	case '/':
1509 		view->count = 0;
1510 		if (view->search_start)
1511 			view_search_start(view);
1512 		else
1513 			err = view->input(new, view, ch);
1514 		break;
1515 	case 'N':
1516 	case 'n':
1517 		if (view->search_started && view->search_next) {
1518 			view->searching = (ch == 'n' ?
1519 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1520 			view->search_next_done = 0;
1521 			view->search_next(view);
1522 		} else
1523 			err = view->input(new, view, ch);
1524 		break;
1525 	case 'A':
1526 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1527 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1528 		else
1529 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1530 		TAILQ_FOREACH(v, views, entry) {
1531 			if (v->reset) {
1532 				err = v->reset(v);
1533 				if (err)
1534 					return err;
1535 			}
1536 			if (v->child && v->child->reset) {
1537 				err = v->child->reset(v->child);
1538 				if (err)
1539 					return err;
1540 			}
1541 		}
1542 		break;
1543 	default:
1544 		err = view->input(new, view, ch);
1545 		break;
1546 	}
1547 
1548 	return err;
1549 }
1550 
1551 static int
1552 view_needs_focus_indication(struct tog_view *view)
1553 {
1554 	if (view_is_parent_view(view)) {
1555 		if (view->child == NULL || view->child->focussed)
1556 			return 0;
1557 		if (!view_is_splitscreen(view->child))
1558 			return 0;
1559 	} else if (!view_is_splitscreen(view))
1560 		return 0;
1561 
1562 	return view->focussed;
1563 }
1564 
1565 static const struct got_error *
1566 view_loop(struct tog_view *view)
1567 {
1568 	const struct got_error *err = NULL;
1569 	struct tog_view_list_head views;
1570 	struct tog_view *new_view;
1571 	char *mode;
1572 	int fast_refresh = 10;
1573 	int done = 0, errcode;
1574 
1575 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1576 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1577 		view->mode = TOG_VIEW_SPLIT_VERT;
1578 	else
1579 		view->mode = TOG_VIEW_SPLIT_HRZN;
1580 
1581 	errcode = pthread_mutex_lock(&tog_mutex);
1582 	if (errcode)
1583 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1584 
1585 	TAILQ_INIT(&views);
1586 	TAILQ_INSERT_HEAD(&views, view, entry);
1587 
1588 	view->focussed = 1;
1589 	err = view->show(view);
1590 	if (err)
1591 		return err;
1592 	update_panels();
1593 	doupdate();
1594 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1595 	    !tog_fatal_signal_received()) {
1596 		/* Refresh fast during initialization, then become slower. */
1597 		if (fast_refresh && fast_refresh-- == 0)
1598 			halfdelay(10); /* switch to once per second */
1599 
1600 		err = view_input(&new_view, &done, view, &views);
1601 		if (err)
1602 			break;
1603 		if (view->dying) {
1604 			struct tog_view *v, *prev = NULL;
1605 
1606 			if (view_is_parent_view(view))
1607 				prev = TAILQ_PREV(view, tog_view_list_head,
1608 				    entry);
1609 			else if (view->parent)
1610 				prev = view->parent;
1611 
1612 			if (view->parent) {
1613 				view->parent->child = NULL;
1614 				view->parent->focus_child = 0;
1615 				/* Restore fullscreen line height. */
1616 				view->parent->nlines = view->parent->lines;
1617 				err = view_resize(view->parent);
1618 				if (err)
1619 					break;
1620 				/* Make resized splits persist. */
1621 				view_transfer_size(view->parent, view);
1622 			} else
1623 				TAILQ_REMOVE(&views, view, entry);
1624 
1625 			err = view_close(view);
1626 			if (err)
1627 				goto done;
1628 
1629 			view = NULL;
1630 			TAILQ_FOREACH(v, &views, entry) {
1631 				if (v->focussed)
1632 					break;
1633 			}
1634 			if (view == NULL && new_view == NULL) {
1635 				/* No view has focus. Try to pick one. */
1636 				if (prev)
1637 					view = prev;
1638 				else if (!TAILQ_EMPTY(&views)) {
1639 					view = TAILQ_LAST(&views,
1640 					    tog_view_list_head);
1641 				}
1642 				if (view) {
1643 					if (view->focus_child) {
1644 						view->child->focussed = 1;
1645 						view = view->child;
1646 					} else
1647 						view->focussed = 1;
1648 				}
1649 			}
1650 		}
1651 		if (new_view) {
1652 			struct tog_view *v, *t;
1653 			/* Only allow one parent view per type. */
1654 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1655 				if (v->type != new_view->type)
1656 					continue;
1657 				TAILQ_REMOVE(&views, v, entry);
1658 				err = view_close(v);
1659 				if (err)
1660 					goto done;
1661 				break;
1662 			}
1663 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1664 			view = new_view;
1665 		}
1666 		if (view) {
1667 			if (view_is_parent_view(view)) {
1668 				if (view->child && view->child->focussed)
1669 					view = view->child;
1670 			} else {
1671 				if (view->parent && view->parent->focussed)
1672 					view = view->parent;
1673 			}
1674 			show_panel(view->panel);
1675 			if (view->child && view_is_splitscreen(view->child))
1676 				show_panel(view->child->panel);
1677 			if (view->parent && view_is_splitscreen(view)) {
1678 				err = view->parent->show(view->parent);
1679 				if (err)
1680 					goto done;
1681 			}
1682 			err = view->show(view);
1683 			if (err)
1684 				goto done;
1685 			if (view->child) {
1686 				err = view->child->show(view->child);
1687 				if (err)
1688 					goto done;
1689 			}
1690 			update_panels();
1691 			doupdate();
1692 		}
1693 	}
1694 done:
1695 	while (!TAILQ_EMPTY(&views)) {
1696 		const struct got_error *close_err;
1697 		view = TAILQ_FIRST(&views);
1698 		TAILQ_REMOVE(&views, view, entry);
1699 		close_err = view_close(view);
1700 		if (close_err && err == NULL)
1701 			err = close_err;
1702 	}
1703 
1704 	errcode = pthread_mutex_unlock(&tog_mutex);
1705 	if (errcode && err == NULL)
1706 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1707 
1708 	return err;
1709 }
1710 
1711 __dead static void
1712 usage_log(void)
1713 {
1714 	endwin();
1715 	fprintf(stderr,
1716 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1717 	    getprogname());
1718 	exit(1);
1719 }
1720 
1721 /* Create newly allocated wide-character string equivalent to a byte string. */
1722 static const struct got_error *
1723 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1724 {
1725 	char *vis = NULL;
1726 	const struct got_error *err = NULL;
1727 
1728 	*ws = NULL;
1729 	*wlen = mbstowcs(NULL, s, 0);
1730 	if (*wlen == (size_t)-1) {
1731 		int vislen;
1732 		if (errno != EILSEQ)
1733 			return got_error_from_errno("mbstowcs");
1734 
1735 		/* byte string invalid in current encoding; try to "fix" it */
1736 		err = got_mbsavis(&vis, &vislen, s);
1737 		if (err)
1738 			return err;
1739 		*wlen = mbstowcs(NULL, vis, 0);
1740 		if (*wlen == (size_t)-1) {
1741 			err = got_error_from_errno("mbstowcs"); /* give up */
1742 			goto done;
1743 		}
1744 	}
1745 
1746 	*ws = calloc(*wlen + 1, sizeof(**ws));
1747 	if (*ws == NULL) {
1748 		err = got_error_from_errno("calloc");
1749 		goto done;
1750 	}
1751 
1752 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1753 		err = got_error_from_errno("mbstowcs");
1754 done:
1755 	free(vis);
1756 	if (err) {
1757 		free(*ws);
1758 		*ws = NULL;
1759 		*wlen = 0;
1760 	}
1761 	return err;
1762 }
1763 
1764 static const struct got_error *
1765 expand_tab(char **ptr, const char *src)
1766 {
1767 	char	*dst;
1768 	size_t	 len, n, idx = 0, sz = 0;
1769 
1770 	*ptr = NULL;
1771 	n = len = strlen(src);
1772 	dst = malloc(n + 1);
1773 	if (dst == NULL)
1774 		return got_error_from_errno("malloc");
1775 
1776 	while (idx < len && src[idx]) {
1777 		const char c = src[idx];
1778 
1779 		if (c == '\t') {
1780 			size_t nb = TABSIZE - sz % TABSIZE;
1781 			char *p;
1782 
1783 			p = realloc(dst, n + nb);
1784 			if (p == NULL) {
1785 				free(dst);
1786 				return got_error_from_errno("realloc");
1787 
1788 			}
1789 			dst = p;
1790 			n += nb;
1791 			memset(dst + sz, ' ', nb);
1792 			sz += nb;
1793 		} else
1794 			dst[sz++] = src[idx];
1795 		++idx;
1796 	}
1797 
1798 	dst[sz] = '\0';
1799 	*ptr = dst;
1800 	return NULL;
1801 }
1802 
1803 /*
1804  * Advance at most n columns from wline starting at offset off.
1805  * Return the index to the first character after the span operation.
1806  * Return the combined column width of all spanned wide character in
1807  * *rcol.
1808  */
1809 static int
1810 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1811 {
1812 	int width, i, cols = 0;
1813 
1814 	if (n == 0) {
1815 		*rcol = cols;
1816 		return off;
1817 	}
1818 
1819 	for (i = off; wline[i] != L'\0'; ++i) {
1820 		if (wline[i] == L'\t')
1821 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1822 		else
1823 			width = wcwidth(wline[i]);
1824 
1825 		if (width == -1) {
1826 			width = 1;
1827 			wline[i] = L'.';
1828 		}
1829 
1830 		if (cols + width > n)
1831 			break;
1832 		cols += width;
1833 	}
1834 
1835 	*rcol = cols;
1836 	return i;
1837 }
1838 
1839 /*
1840  * Format a line for display, ensuring that it won't overflow a width limit.
1841  * With scrolling, the width returned refers to the scrolled version of the
1842  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1843  */
1844 static const struct got_error *
1845 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1846     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1847 {
1848 	const struct got_error *err = NULL;
1849 	int cols;
1850 	wchar_t *wline = NULL;
1851 	char *exstr = NULL;
1852 	size_t wlen;
1853 	int i, scrollx;
1854 
1855 	*wlinep = NULL;
1856 	*widthp = 0;
1857 
1858 	if (expand) {
1859 		err = expand_tab(&exstr, line);
1860 		if (err)
1861 			return err;
1862 	}
1863 
1864 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1865 	free(exstr);
1866 	if (err)
1867 		return err;
1868 
1869 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1870 
1871 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1872 		wline[wlen - 1] = L'\0';
1873 		wlen--;
1874 	}
1875 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1876 		wline[wlen - 1] = L'\0';
1877 		wlen--;
1878 	}
1879 
1880 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1881 	wline[i] = L'\0';
1882 
1883 	if (widthp)
1884 		*widthp = cols;
1885 	if (scrollxp)
1886 		*scrollxp = scrollx;
1887 	if (err)
1888 		free(wline);
1889 	else
1890 		*wlinep = wline;
1891 	return err;
1892 }
1893 
1894 static const struct got_error*
1895 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1896     struct got_object_id *id, struct got_repository *repo)
1897 {
1898 	static const struct got_error *err = NULL;
1899 	struct got_reflist_entry *re;
1900 	char *s;
1901 	const char *name;
1902 
1903 	*refs_str = NULL;
1904 
1905 	TAILQ_FOREACH(re, refs, entry) {
1906 		struct got_tag_object *tag = NULL;
1907 		struct got_object_id *ref_id;
1908 		int cmp;
1909 
1910 		name = got_ref_get_name(re->ref);
1911 		if (strcmp(name, GOT_REF_HEAD) == 0)
1912 			continue;
1913 		if (strncmp(name, "refs/", 5) == 0)
1914 			name += 5;
1915 		if (strncmp(name, "got/", 4) == 0 &&
1916 		    strncmp(name, "got/backup/", 11) != 0)
1917 			continue;
1918 		if (strncmp(name, "heads/", 6) == 0)
1919 			name += 6;
1920 		if (strncmp(name, "remotes/", 8) == 0) {
1921 			name += 8;
1922 			s = strstr(name, "/" GOT_REF_HEAD);
1923 			if (s != NULL && s[strlen(s)] == '\0')
1924 				continue;
1925 		}
1926 		err = got_ref_resolve(&ref_id, repo, re->ref);
1927 		if (err)
1928 			break;
1929 		if (strncmp(name, "tags/", 5) == 0) {
1930 			err = got_object_open_as_tag(&tag, repo, ref_id);
1931 			if (err) {
1932 				if (err->code != GOT_ERR_OBJ_TYPE) {
1933 					free(ref_id);
1934 					break;
1935 				}
1936 				/* Ref points at something other than a tag. */
1937 				err = NULL;
1938 				tag = NULL;
1939 			}
1940 		}
1941 		cmp = got_object_id_cmp(tag ?
1942 		    got_object_tag_get_object_id(tag) : ref_id, id);
1943 		free(ref_id);
1944 		if (tag)
1945 			got_object_tag_close(tag);
1946 		if (cmp != 0)
1947 			continue;
1948 		s = *refs_str;
1949 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1950 		    s ? ", " : "", name) == -1) {
1951 			err = got_error_from_errno("asprintf");
1952 			free(s);
1953 			*refs_str = NULL;
1954 			break;
1955 		}
1956 		free(s);
1957 	}
1958 
1959 	return err;
1960 }
1961 
1962 static const struct got_error *
1963 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1964     int col_tab_align)
1965 {
1966 	char *smallerthan;
1967 
1968 	smallerthan = strchr(author, '<');
1969 	if (smallerthan && smallerthan[1] != '\0')
1970 		author = smallerthan + 1;
1971 	author[strcspn(author, "@>")] = '\0';
1972 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1973 	    col_tab_align, 0);
1974 }
1975 
1976 static const struct got_error *
1977 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1978     struct got_object_id *id, const size_t date_display_cols,
1979     int author_display_cols)
1980 {
1981 	struct tog_log_view_state *s = &view->state.log;
1982 	const struct got_error *err = NULL;
1983 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1984 	char *logmsg0 = NULL, *logmsg = NULL;
1985 	char *author = NULL;
1986 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1987 	int author_width, logmsg_width;
1988 	char *newline, *line = NULL;
1989 	int col, limit, scrollx;
1990 	const int avail = view->ncols;
1991 	struct tm tm;
1992 	time_t committer_time;
1993 	struct tog_color *tc;
1994 
1995 	committer_time = got_object_commit_get_committer_time(commit);
1996 	if (gmtime_r(&committer_time, &tm) == NULL)
1997 		return got_error_from_errno("gmtime_r");
1998 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1999 		return got_error(GOT_ERR_NO_SPACE);
2000 
2001 	if (avail <= date_display_cols)
2002 		limit = MIN(sizeof(datebuf) - 1, avail);
2003 	else
2004 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2005 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2006 	if (tc)
2007 		wattr_on(view->window,
2008 		    COLOR_PAIR(tc->colorpair), NULL);
2009 	waddnstr(view->window, datebuf, limit);
2010 	if (tc)
2011 		wattr_off(view->window,
2012 		    COLOR_PAIR(tc->colorpair), NULL);
2013 	col = limit;
2014 	if (col > avail)
2015 		goto done;
2016 
2017 	if (avail >= 120) {
2018 		char *id_str;
2019 		err = got_object_id_str(&id_str, id);
2020 		if (err)
2021 			goto done;
2022 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2023 		if (tc)
2024 			wattr_on(view->window,
2025 			    COLOR_PAIR(tc->colorpair), NULL);
2026 		wprintw(view->window, "%.8s ", id_str);
2027 		if (tc)
2028 			wattr_off(view->window,
2029 			    COLOR_PAIR(tc->colorpair), NULL);
2030 		free(id_str);
2031 		col += 9;
2032 		if (col > avail)
2033 			goto done;
2034 	}
2035 
2036 	if (s->use_committer)
2037 		author = strdup(got_object_commit_get_committer(commit));
2038 	else
2039 		author = strdup(got_object_commit_get_author(commit));
2040 	if (author == NULL) {
2041 		err = got_error_from_errno("strdup");
2042 		goto done;
2043 	}
2044 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2045 	if (err)
2046 		goto done;
2047 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2048 	if (tc)
2049 		wattr_on(view->window,
2050 		    COLOR_PAIR(tc->colorpair), NULL);
2051 	waddwstr(view->window, wauthor);
2052 	if (tc)
2053 		wattr_off(view->window,
2054 		    COLOR_PAIR(tc->colorpair), NULL);
2055 	col += author_width;
2056 	while (col < avail && author_width < author_display_cols + 2) {
2057 		waddch(view->window, ' ');
2058 		col++;
2059 		author_width++;
2060 	}
2061 	if (col > avail)
2062 		goto done;
2063 
2064 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2065 	if (err)
2066 		goto done;
2067 	logmsg = logmsg0;
2068 	while (*logmsg == '\n')
2069 		logmsg++;
2070 	newline = strchr(logmsg, '\n');
2071 	if (newline)
2072 		*newline = '\0';
2073 	limit = avail - col;
2074 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2075 		limit--;	/* for the border */
2076 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2077 	    limit, col, 1);
2078 	if (err)
2079 		goto done;
2080 	waddwstr(view->window, &wlogmsg[scrollx]);
2081 	col += MAX(logmsg_width, 0);
2082 	while (col < avail) {
2083 		waddch(view->window, ' ');
2084 		col++;
2085 	}
2086 done:
2087 	free(logmsg0);
2088 	free(wlogmsg);
2089 	free(author);
2090 	free(wauthor);
2091 	free(line);
2092 	return err;
2093 }
2094 
2095 static struct commit_queue_entry *
2096 alloc_commit_queue_entry(struct got_commit_object *commit,
2097     struct got_object_id *id)
2098 {
2099 	struct commit_queue_entry *entry;
2100 	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,
2339 		    COLOR_PAIR(tc->colorpair), NULL);
2340 	waddwstr(view->window, wline);
2341 	if (tc)
2342 		wattr_off(view->window,
2343 		    COLOR_PAIR(tc->colorpair), NULL);
2344 	while (width < view->ncols) {
2345 		waddch(view->window, ' ');
2346 		width++;
2347 	}
2348 	if (view_needs_focus_indication(view))
2349 		wstandend(view->window);
2350 	free(wline);
2351 	if (limit <= 1)
2352 		goto done;
2353 
2354 	/* Grow author column size if necessary, and set view->maxx. */
2355 	entry = s->first_displayed_entry;
2356 	ncommits = 0;
2357 	view->maxx = 0;
2358 	while (entry) {
2359 		struct got_commit_object *c = entry->commit;
2360 		char *author, *eol, *msg, *msg0;
2361 		wchar_t *wauthor, *wmsg;
2362 		int width;
2363 		if (ncommits >= limit - 1)
2364 			break;
2365 		if (s->use_committer)
2366 			author = strdup(got_object_commit_get_committer(c));
2367 		else
2368 			author = strdup(got_object_commit_get_author(c));
2369 		if (author == NULL) {
2370 			err = got_error_from_errno("strdup");
2371 			goto done;
2372 		}
2373 		err = format_author(&wauthor, &width, author, COLS,
2374 		    date_display_cols);
2375 		if (author_cols < width)
2376 			author_cols = width;
2377 		free(wauthor);
2378 		free(author);
2379 		if (err)
2380 			goto done;
2381 		err = got_object_commit_get_logmsg(&msg0, c);
2382 		if (err)
2383 			goto done;
2384 		msg = msg0;
2385 		while (*msg == '\n')
2386 			++msg;
2387 		if ((eol = strchr(msg, '\n')))
2388 			*eol = '\0';
2389 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2390 		    date_display_cols + author_cols, 0);
2391 		if (err)
2392 			goto done;
2393 		view->maxx = MAX(view->maxx, width);
2394 		free(msg0);
2395 		free(wmsg);
2396 		ncommits++;
2397 		entry = TAILQ_NEXT(entry, entry);
2398 	}
2399 
2400 	entry = s->first_displayed_entry;
2401 	s->last_displayed_entry = s->first_displayed_entry;
2402 	ncommits = 0;
2403 	while (entry) {
2404 		if (ncommits >= limit - 1)
2405 			break;
2406 		if (ncommits == s->selected)
2407 			wstandout(view->window);
2408 		err = draw_commit(view, entry->commit, entry->id,
2409 		    date_display_cols, author_cols);
2410 		if (ncommits == s->selected)
2411 			wstandend(view->window);
2412 		if (err)
2413 			goto done;
2414 		ncommits++;
2415 		s->last_displayed_entry = entry;
2416 		entry = TAILQ_NEXT(entry, entry);
2417 	}
2418 
2419 	view_border(view);
2420 done:
2421 	free(id_str);
2422 	free(refs_str);
2423 	free(ncommits_str);
2424 	free(header);
2425 	return err;
2426 }
2427 
2428 static void
2429 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2430 {
2431 	struct commit_queue_entry *entry;
2432 	int nscrolled = 0;
2433 
2434 	entry = TAILQ_FIRST(&s->commits.head);
2435 	if (s->first_displayed_entry == entry)
2436 		return;
2437 
2438 	entry = s->first_displayed_entry;
2439 	while (entry && nscrolled < maxscroll) {
2440 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2441 		if (entry) {
2442 			s->first_displayed_entry = entry;
2443 			nscrolled++;
2444 		}
2445 	}
2446 }
2447 
2448 static const struct got_error *
2449 trigger_log_thread(struct tog_view *view, int wait)
2450 {
2451 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2452 	int errcode;
2453 
2454 	halfdelay(1); /* fast refresh while loading commits */
2455 
2456 	while (!ta->log_complete && !tog_thread_error &&
2457 	    (ta->commits_needed > 0 || ta->load_all)) {
2458 		/* Wake the log thread. */
2459 		errcode = pthread_cond_signal(&ta->need_commits);
2460 		if (errcode)
2461 			return got_error_set_errno(errcode,
2462 			    "pthread_cond_signal");
2463 
2464 		/*
2465 		 * The mutex will be released while the view loop waits
2466 		 * in wgetch(), at which time the log thread will run.
2467 		 */
2468 		if (!wait)
2469 			break;
2470 
2471 		/* Display progress update in log view. */
2472 		show_log_view(view);
2473 		update_panels();
2474 		doupdate();
2475 
2476 		/* Wait right here while next commit is being loaded. */
2477 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2478 		if (errcode)
2479 			return got_error_set_errno(errcode,
2480 			    "pthread_cond_wait");
2481 
2482 		/* Display progress update in log view. */
2483 		show_log_view(view);
2484 		update_panels();
2485 		doupdate();
2486 	}
2487 
2488 	return NULL;
2489 }
2490 
2491 static const struct got_error *
2492 request_log_commits(struct tog_view *view)
2493 {
2494 	struct tog_log_view_state	*state = &view->state.log;
2495 	const struct got_error		*err = NULL;
2496 
2497 	if (state->thread_args.log_complete)
2498 		return NULL;
2499 
2500 	state->thread_args.commits_needed += view->nscrolled;
2501 	err = trigger_log_thread(view, 1);
2502 	view->nscrolled = 0;
2503 
2504 	return err;
2505 }
2506 
2507 static const struct got_error *
2508 log_scroll_down(struct tog_view *view, int maxscroll)
2509 {
2510 	struct tog_log_view_state *s = &view->state.log;
2511 	const struct got_error *err = NULL;
2512 	struct commit_queue_entry *pentry;
2513 	int nscrolled = 0, ncommits_needed;
2514 
2515 	if (s->last_displayed_entry == NULL)
2516 		return NULL;
2517 
2518 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2519 	if (s->commits.ncommits < ncommits_needed &&
2520 	    !s->thread_args.log_complete) {
2521 		/*
2522 		 * Ask the log thread for required amount of commits.
2523 		 */
2524 		s->thread_args.commits_needed +=
2525 		    ncommits_needed - s->commits.ncommits;
2526 		err = trigger_log_thread(view, 1);
2527 		if (err)
2528 			return err;
2529 	}
2530 
2531 	do {
2532 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2533 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2534 			break;
2535 
2536 		s->last_displayed_entry = pentry ?
2537 		    pentry : s->last_displayed_entry;;
2538 
2539 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2540 		if (pentry == NULL)
2541 			break;
2542 		s->first_displayed_entry = pentry;
2543 	} while (++nscrolled < maxscroll);
2544 
2545 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2546 		view->nscrolled += nscrolled;
2547 	else
2548 		view->nscrolled = 0;
2549 
2550 	return err;
2551 }
2552 
2553 static const struct got_error *
2554 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2555     struct got_commit_object *commit, struct got_object_id *commit_id,
2556     struct tog_view *log_view, struct got_repository *repo)
2557 {
2558 	const struct got_error *err;
2559 	struct got_object_qid *parent_id;
2560 	struct tog_view *diff_view;
2561 
2562 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2563 	if (diff_view == NULL)
2564 		return got_error_from_errno("view_open");
2565 
2566 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2567 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2568 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2569 	if (err == NULL)
2570 		*new_view = diff_view;
2571 	return err;
2572 }
2573 
2574 static const struct got_error *
2575 tree_view_visit_subtree(struct tog_tree_view_state *s,
2576     struct got_tree_object *subtree)
2577 {
2578 	struct tog_parent_tree *parent;
2579 
2580 	parent = calloc(1, sizeof(*parent));
2581 	if (parent == NULL)
2582 		return got_error_from_errno("calloc");
2583 
2584 	parent->tree = s->tree;
2585 	parent->first_displayed_entry = s->first_displayed_entry;
2586 	parent->selected_entry = s->selected_entry;
2587 	parent->selected = s->selected;
2588 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2589 	s->tree = subtree;
2590 	s->selected = 0;
2591 	s->first_displayed_entry = NULL;
2592 	return NULL;
2593 }
2594 
2595 static const struct got_error *
2596 tree_view_walk_path(struct tog_tree_view_state *s,
2597     struct got_commit_object *commit, const char *path)
2598 {
2599 	const struct got_error *err = NULL;
2600 	struct got_tree_object *tree = NULL;
2601 	const char *p;
2602 	char *slash, *subpath = NULL;
2603 
2604 	/* Walk the path and open corresponding tree objects. */
2605 	p = path;
2606 	while (*p) {
2607 		struct got_tree_entry *te;
2608 		struct got_object_id *tree_id;
2609 		char *te_name;
2610 
2611 		while (p[0] == '/')
2612 			p++;
2613 
2614 		/* Ensure the correct subtree entry is selected. */
2615 		slash = strchr(p, '/');
2616 		if (slash == NULL)
2617 			te_name = strdup(p);
2618 		else
2619 			te_name = strndup(p, slash - p);
2620 		if (te_name == NULL) {
2621 			err = got_error_from_errno("strndup");
2622 			break;
2623 		}
2624 		te = got_object_tree_find_entry(s->tree, te_name);
2625 		if (te == NULL) {
2626 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2627 			free(te_name);
2628 			break;
2629 		}
2630 		free(te_name);
2631 		s->first_displayed_entry = s->selected_entry = te;
2632 
2633 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2634 			break; /* jump to this file's entry */
2635 
2636 		slash = strchr(p, '/');
2637 		if (slash)
2638 			subpath = strndup(path, slash - path);
2639 		else
2640 			subpath = strdup(path);
2641 		if (subpath == NULL) {
2642 			err = got_error_from_errno("strdup");
2643 			break;
2644 		}
2645 
2646 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2647 		    subpath);
2648 		if (err)
2649 			break;
2650 
2651 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2652 		free(tree_id);
2653 		if (err)
2654 			break;
2655 
2656 		err = tree_view_visit_subtree(s, tree);
2657 		if (err) {
2658 			got_object_tree_close(tree);
2659 			break;
2660 		}
2661 		if (slash == NULL)
2662 			break;
2663 		free(subpath);
2664 		subpath = NULL;
2665 		p = slash;
2666 	}
2667 
2668 	free(subpath);
2669 	return err;
2670 }
2671 
2672 static const struct got_error *
2673 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2674     struct commit_queue_entry *entry, const char *path,
2675     const char *head_ref_name, struct got_repository *repo)
2676 {
2677 	const struct got_error *err = NULL;
2678 	struct tog_tree_view_state *s;
2679 	struct tog_view *tree_view;
2680 
2681 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2682 	if (tree_view == NULL)
2683 		return got_error_from_errno("view_open");
2684 
2685 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2686 	if (err)
2687 		return err;
2688 	s = &tree_view->state.tree;
2689 
2690 	*new_view = tree_view;
2691 
2692 	if (got_path_is_root_dir(path))
2693 		return NULL;
2694 
2695 	return tree_view_walk_path(s, entry->commit, path);
2696 }
2697 
2698 static const struct got_error *
2699 block_signals_used_by_main_thread(void)
2700 {
2701 	sigset_t sigset;
2702 	int errcode;
2703 
2704 	if (sigemptyset(&sigset) == -1)
2705 		return got_error_from_errno("sigemptyset");
2706 
2707 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2708 	if (sigaddset(&sigset, SIGWINCH) == -1)
2709 		return got_error_from_errno("sigaddset");
2710 	if (sigaddset(&sigset, SIGCONT) == -1)
2711 		return got_error_from_errno("sigaddset");
2712 	if (sigaddset(&sigset, SIGINT) == -1)
2713 		return got_error_from_errno("sigaddset");
2714 	if (sigaddset(&sigset, SIGTERM) == -1)
2715 		return got_error_from_errno("sigaddset");
2716 
2717 	/* ncurses handles SIGTSTP */
2718 	if (sigaddset(&sigset, SIGTSTP) == -1)
2719 		return got_error_from_errno("sigaddset");
2720 
2721 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2722 	if (errcode)
2723 		return got_error_set_errno(errcode, "pthread_sigmask");
2724 
2725 	return NULL;
2726 }
2727 
2728 static void *
2729 log_thread(void *arg)
2730 {
2731 	const struct got_error *err = NULL;
2732 	int errcode = 0;
2733 	struct tog_log_thread_args *a = arg;
2734 	int done = 0;
2735 
2736 	/*
2737 	 * Sync startup with main thread such that we begin our
2738 	 * work once view_input() has released the mutex.
2739 	 */
2740 	errcode = pthread_mutex_lock(&tog_mutex);
2741 	if (errcode) {
2742 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2743 		return (void *)err;
2744 	}
2745 
2746 	err = block_signals_used_by_main_thread();
2747 	if (err) {
2748 		pthread_mutex_unlock(&tog_mutex);
2749 		goto done;
2750 	}
2751 
2752 	while (!done && !err && !tog_fatal_signal_received()) {
2753 		errcode = pthread_mutex_unlock(&tog_mutex);
2754 		if (errcode) {
2755 			err = got_error_set_errno(errcode,
2756 			    "pthread_mutex_unlock");
2757 			goto done;
2758 		}
2759 		err = queue_commits(a);
2760 		if (err) {
2761 			if (err->code != GOT_ERR_ITER_COMPLETED)
2762 				goto done;
2763 			err = NULL;
2764 			done = 1;
2765 		} else if (a->commits_needed > 0 && !a->load_all)
2766 			a->commits_needed--;
2767 
2768 		errcode = pthread_mutex_lock(&tog_mutex);
2769 		if (errcode) {
2770 			err = got_error_set_errno(errcode,
2771 			    "pthread_mutex_lock");
2772 			goto done;
2773 		} else if (*a->quit)
2774 			done = 1;
2775 		else if (*a->first_displayed_entry == NULL) {
2776 			*a->first_displayed_entry =
2777 			    TAILQ_FIRST(&a->commits->head);
2778 			*a->selected_entry = *a->first_displayed_entry;
2779 		}
2780 
2781 		errcode = pthread_cond_signal(&a->commit_loaded);
2782 		if (errcode) {
2783 			err = got_error_set_errno(errcode,
2784 			    "pthread_cond_signal");
2785 			pthread_mutex_unlock(&tog_mutex);
2786 			goto done;
2787 		}
2788 
2789 		if (done)
2790 			a->commits_needed = 0;
2791 		else {
2792 			if (a->commits_needed == 0 && !a->load_all) {
2793 				errcode = pthread_cond_wait(&a->need_commits,
2794 				    &tog_mutex);
2795 				if (errcode) {
2796 					err = got_error_set_errno(errcode,
2797 					    "pthread_cond_wait");
2798 					pthread_mutex_unlock(&tog_mutex);
2799 					goto done;
2800 				}
2801 				if (*a->quit)
2802 					done = 1;
2803 			}
2804 		}
2805 	}
2806 	a->log_complete = 1;
2807 	errcode = pthread_mutex_unlock(&tog_mutex);
2808 	if (errcode)
2809 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2810 done:
2811 	if (err) {
2812 		tog_thread_error = 1;
2813 		pthread_cond_signal(&a->commit_loaded);
2814 	}
2815 	return (void *)err;
2816 }
2817 
2818 static const struct got_error *
2819 stop_log_thread(struct tog_log_view_state *s)
2820 {
2821 	const struct got_error *err = NULL, *thread_err = NULL;
2822 	int errcode;
2823 
2824 	if (s->thread) {
2825 		s->quit = 1;
2826 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2827 		if (errcode)
2828 			return got_error_set_errno(errcode,
2829 			    "pthread_cond_signal");
2830 		errcode = pthread_mutex_unlock(&tog_mutex);
2831 		if (errcode)
2832 			return got_error_set_errno(errcode,
2833 			    "pthread_mutex_unlock");
2834 		errcode = pthread_join(s->thread, (void **)&thread_err);
2835 		if (errcode)
2836 			return got_error_set_errno(errcode, "pthread_join");
2837 		errcode = pthread_mutex_lock(&tog_mutex);
2838 		if (errcode)
2839 			return got_error_set_errno(errcode,
2840 			    "pthread_mutex_lock");
2841 		s->thread = 0; //NULL;
2842 	}
2843 
2844 	if (s->thread_args.repo) {
2845 		err = got_repo_close(s->thread_args.repo);
2846 		s->thread_args.repo = NULL;
2847 	}
2848 
2849 	if (s->thread_args.pack_fds) {
2850 		const struct got_error *pack_err =
2851 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2852 		if (err == NULL)
2853 			err = pack_err;
2854 		s->thread_args.pack_fds = NULL;
2855 	}
2856 
2857 	if (s->thread_args.graph) {
2858 		got_commit_graph_close(s->thread_args.graph);
2859 		s->thread_args.graph = NULL;
2860 	}
2861 
2862 	return err ? err : thread_err;
2863 }
2864 
2865 static const struct got_error *
2866 close_log_view(struct tog_view *view)
2867 {
2868 	const struct got_error *err = NULL;
2869 	struct tog_log_view_state *s = &view->state.log;
2870 	int errcode;
2871 
2872 	err = stop_log_thread(s);
2873 
2874 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2875 	if (errcode && err == NULL)
2876 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2877 
2878 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2879 	if (errcode && err == NULL)
2880 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2881 
2882 	free_commits(&s->commits);
2883 	free(s->in_repo_path);
2884 	s->in_repo_path = NULL;
2885 	free(s->start_id);
2886 	s->start_id = NULL;
2887 	free(s->head_ref_name);
2888 	s->head_ref_name = NULL;
2889 	return err;
2890 }
2891 
2892 static const struct got_error *
2893 search_start_log_view(struct tog_view *view)
2894 {
2895 	struct tog_log_view_state *s = &view->state.log;
2896 
2897 	s->matched_entry = NULL;
2898 	s->search_entry = NULL;
2899 	return NULL;
2900 }
2901 
2902 static const struct got_error *
2903 search_next_log_view(struct tog_view *view)
2904 {
2905 	const struct got_error *err = NULL;
2906 	struct tog_log_view_state *s = &view->state.log;
2907 	struct commit_queue_entry *entry;
2908 
2909 	/* Display progress update in log view. */
2910 	show_log_view(view);
2911 	update_panels();
2912 	doupdate();
2913 
2914 	if (s->search_entry) {
2915 		int errcode, ch;
2916 		errcode = pthread_mutex_unlock(&tog_mutex);
2917 		if (errcode)
2918 			return got_error_set_errno(errcode,
2919 			    "pthread_mutex_unlock");
2920 		ch = wgetch(view->window);
2921 		errcode = pthread_mutex_lock(&tog_mutex);
2922 		if (errcode)
2923 			return got_error_set_errno(errcode,
2924 			    "pthread_mutex_lock");
2925 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2926 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2927 			return NULL;
2928 		}
2929 		if (view->searching == TOG_SEARCH_FORWARD)
2930 			entry = TAILQ_NEXT(s->search_entry, entry);
2931 		else
2932 			entry = TAILQ_PREV(s->search_entry,
2933 			    commit_queue_head, entry);
2934 	} else if (s->matched_entry) {
2935 		int matched_idx = s->matched_entry->idx;
2936 		int selected_idx = s->selected_entry->idx;
2937 
2938 		/*
2939 		 * If the user has moved the cursor after we hit a match,
2940 		 * the position from where we should continue searching
2941 		 * might have changed.
2942 		 */
2943 		if (view->searching == TOG_SEARCH_FORWARD) {
2944 			if (matched_idx > selected_idx)
2945 				entry = TAILQ_NEXT(s->selected_entry, entry);
2946 			else
2947 				entry = TAILQ_NEXT(s->matched_entry, entry);
2948 		} else {
2949 			if (matched_idx < selected_idx)
2950 				entry = TAILQ_PREV(s->selected_entry,
2951 						commit_queue_head, entry);
2952 			else
2953 				entry = TAILQ_PREV(s->matched_entry,
2954 						commit_queue_head, entry);
2955 		}
2956 	} else {
2957 		entry = s->selected_entry;
2958 	}
2959 
2960 	while (1) {
2961 		int have_match = 0;
2962 
2963 		if (entry == NULL) {
2964 			if (s->thread_args.log_complete ||
2965 			    view->searching == TOG_SEARCH_BACKWARD) {
2966 				view->search_next_done =
2967 				    (s->matched_entry == NULL ?
2968 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2969 				s->search_entry = NULL;
2970 				return NULL;
2971 			}
2972 			/*
2973 			 * Poke the log thread for more commits and return,
2974 			 * allowing the main loop to make progress. Search
2975 			 * will resume at s->search_entry once we come back.
2976 			 */
2977 			s->thread_args.commits_needed++;
2978 			return trigger_log_thread(view, 0);
2979 		}
2980 
2981 		err = match_commit(&have_match, entry->id, entry->commit,
2982 		    &view->regex);
2983 		if (err)
2984 			break;
2985 		if (have_match) {
2986 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2987 			s->matched_entry = entry;
2988 			break;
2989 		}
2990 
2991 		s->search_entry = entry;
2992 		if (view->searching == TOG_SEARCH_FORWARD)
2993 			entry = TAILQ_NEXT(entry, entry);
2994 		else
2995 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2996 	}
2997 
2998 	if (s->matched_entry) {
2999 		int cur = s->selected_entry->idx;
3000 		while (cur < s->matched_entry->idx) {
3001 			err = input_log_view(NULL, view, KEY_DOWN);
3002 			if (err)
3003 				return err;
3004 			cur++;
3005 		}
3006 		while (cur > s->matched_entry->idx) {
3007 			err = input_log_view(NULL, view, KEY_UP);
3008 			if (err)
3009 				return err;
3010 			cur--;
3011 		}
3012 	}
3013 
3014 	s->search_entry = NULL;
3015 
3016 	return NULL;
3017 }
3018 
3019 static const struct got_error *
3020 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3021     struct got_repository *repo, const char *head_ref_name,
3022     const char *in_repo_path, int log_branches)
3023 {
3024 	const struct got_error *err = NULL;
3025 	struct tog_log_view_state *s = &view->state.log;
3026 	struct got_repository *thread_repo = NULL;
3027 	struct got_commit_graph *thread_graph = NULL;
3028 	int errcode;
3029 
3030 	if (in_repo_path != s->in_repo_path) {
3031 		free(s->in_repo_path);
3032 		s->in_repo_path = strdup(in_repo_path);
3033 		if (s->in_repo_path == NULL)
3034 			return got_error_from_errno("strdup");
3035 	}
3036 
3037 	/* The commit queue only contains commits being displayed. */
3038 	TAILQ_INIT(&s->commits.head);
3039 	s->commits.ncommits = 0;
3040 
3041 	s->repo = repo;
3042 	if (head_ref_name) {
3043 		s->head_ref_name = strdup(head_ref_name);
3044 		if (s->head_ref_name == NULL) {
3045 			err = got_error_from_errno("strdup");
3046 			goto done;
3047 		}
3048 	}
3049 	s->start_id = got_object_id_dup(start_id);
3050 	if (s->start_id == NULL) {
3051 		err = got_error_from_errno("got_object_id_dup");
3052 		goto done;
3053 	}
3054 	s->log_branches = log_branches;
3055 
3056 	STAILQ_INIT(&s->colors);
3057 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3058 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3059 		    get_color_value("TOG_COLOR_COMMIT"));
3060 		if (err)
3061 			goto done;
3062 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3063 		    get_color_value("TOG_COLOR_AUTHOR"));
3064 		if (err) {
3065 			free_colors(&s->colors);
3066 			goto done;
3067 		}
3068 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3069 		    get_color_value("TOG_COLOR_DATE"));
3070 		if (err) {
3071 			free_colors(&s->colors);
3072 			goto done;
3073 		}
3074 	}
3075 
3076 	view->show = show_log_view;
3077 	view->input = input_log_view;
3078 	view->resize = resize_log_view;
3079 	view->close = close_log_view;
3080 	view->search_start = search_start_log_view;
3081 	view->search_next = search_next_log_view;
3082 
3083 	if (s->thread_args.pack_fds == NULL) {
3084 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3085 		if (err)
3086 			goto done;
3087 	}
3088 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3089 	    s->thread_args.pack_fds);
3090 	if (err)
3091 		goto done;
3092 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3093 	    !s->log_branches);
3094 	if (err)
3095 		goto done;
3096 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3097 	    s->repo, NULL, NULL);
3098 	if (err)
3099 		goto done;
3100 
3101 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3102 	if (errcode) {
3103 		err = got_error_set_errno(errcode, "pthread_cond_init");
3104 		goto done;
3105 	}
3106 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3107 	if (errcode) {
3108 		err = got_error_set_errno(errcode, "pthread_cond_init");
3109 		goto done;
3110 	}
3111 
3112 	s->thread_args.commits_needed = view->nlines;
3113 	s->thread_args.graph = thread_graph;
3114 	s->thread_args.commits = &s->commits;
3115 	s->thread_args.in_repo_path = s->in_repo_path;
3116 	s->thread_args.start_id = s->start_id;
3117 	s->thread_args.repo = thread_repo;
3118 	s->thread_args.log_complete = 0;
3119 	s->thread_args.quit = &s->quit;
3120 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3121 	s->thread_args.selected_entry = &s->selected_entry;
3122 	s->thread_args.searching = &view->searching;
3123 	s->thread_args.search_next_done = &view->search_next_done;
3124 	s->thread_args.regex = &view->regex;
3125 done:
3126 	if (err)
3127 		close_log_view(view);
3128 	return err;
3129 }
3130 
3131 static const struct got_error *
3132 show_log_view(struct tog_view *view)
3133 {
3134 	const struct got_error *err;
3135 	struct tog_log_view_state *s = &view->state.log;
3136 
3137 	if (s->thread == 0) { //NULL) {
3138 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3139 		    &s->thread_args);
3140 		if (errcode)
3141 			return got_error_set_errno(errcode, "pthread_create");
3142 		if (s->thread_args.commits_needed > 0) {
3143 			err = trigger_log_thread(view, 1);
3144 			if (err)
3145 				return err;
3146 		}
3147 	}
3148 
3149 	return draw_commits(view);
3150 }
3151 
3152 static void
3153 log_move_cursor_up(struct tog_view *view, int page, int home)
3154 {
3155 	struct tog_log_view_state *s = &view->state.log;
3156 
3157 	if (s->selected_entry->idx == 0)
3158 		view->count = 0;
3159 	if (s->first_displayed_entry == NULL)
3160 		return;
3161 
3162 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3163 	    || home)
3164 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3165 
3166 	if (!page && !home && s->selected > 0)
3167 		--s->selected;
3168 	else
3169 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3170 
3171 	select_commit(s);
3172 	return;
3173 }
3174 
3175 static const struct got_error *
3176 log_move_cursor_down(struct tog_view *view, int page)
3177 {
3178 	struct tog_log_view_state	*s = &view->state.log;
3179 	const struct got_error		*err = NULL;
3180 	int				 eos = view->nlines - 2;
3181 
3182 	if (s->thread_args.log_complete &&
3183 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3184 		return NULL;
3185 
3186 	if (view_is_hsplit_top(view))
3187 		--eos;  /* border consumes the last line */
3188 
3189 	if (!page) {
3190 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3191 			++s->selected;
3192 		else
3193 			err = log_scroll_down(view, 1);
3194 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3195 		struct commit_queue_entry *entry;
3196 		int n;
3197 
3198 		s->selected = 0;
3199 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3200 		s->last_displayed_entry = entry;
3201 		for (n = 0; n <= eos; n++) {
3202 			if (entry == NULL)
3203 				break;
3204 			s->first_displayed_entry = entry;
3205 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3206 		}
3207 		if (n > 0)
3208 			s->selected = n - 1;
3209 	} else {
3210 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1 &&
3211 		    s->thread_args.log_complete)
3212 			s->selected += MIN(page,
3213 			    s->commits.ncommits - s->selected_entry->idx - 1);
3214 		else
3215 			err = log_scroll_down(view, page);
3216 	}
3217 	if (err)
3218 		return err;
3219 
3220 	/*
3221 	 * We might necessarily overshoot in horizontal
3222 	 * splits; if so, select the last displayed commit.
3223 	 */
3224 	if (s->first_displayed_entry && s->last_displayed_entry) {
3225 		s->selected = MIN(s->selected,
3226 		    s->last_displayed_entry->idx -
3227 		    s->first_displayed_entry->idx);
3228 	}
3229 
3230 	select_commit(s);
3231 
3232 	if (s->thread_args.log_complete &&
3233 	    s->selected_entry->idx == s->commits.ncommits - 1)
3234 		view->count = 0;
3235 
3236 	return NULL;
3237 }
3238 
3239 static void
3240 view_get_split(struct tog_view *view, int *y, int *x)
3241 {
3242 	*x = 0;
3243 	*y = 0;
3244 
3245 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3246 		if (view->child && view->child->resized_y)
3247 			*y = view->child->resized_y;
3248 		else if (view->resized_y)
3249 			*y = view->resized_y;
3250 		else
3251 			*y = view_split_begin_y(view->lines);
3252 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3253 		if (view->child && view->child->resized_x)
3254 			*x = view->child->resized_x;
3255 		else if (view->resized_x)
3256 			*x = view->resized_x;
3257 		else
3258 			*x = view_split_begin_x(view->begin_x);
3259 	}
3260 }
3261 
3262 /* Split view horizontally at y and offset view->state->selected line. */
3263 static const struct got_error *
3264 view_init_hsplit(struct tog_view *view, int y)
3265 {
3266 	const struct got_error *err = NULL;
3267 
3268 	view->nlines = y;
3269 	view->ncols = COLS;
3270 	err = view_resize(view);
3271 	if (err)
3272 		return err;
3273 
3274 	err = offset_selection_down(view);
3275 
3276 	return err;
3277 }
3278 
3279 static const struct got_error *
3280 log_goto_line(struct tog_view *view, int nlines)
3281 {
3282 	const struct got_error		*err = NULL;
3283 	struct tog_log_view_state	*s = &view->state.log;
3284 	int				 g, idx = s->selected_entry->idx;
3285 
3286 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3287 		return NULL;
3288 
3289 	g = view->gline;
3290 	view->gline = 0;
3291 
3292 	if (g >= s->first_displayed_entry->idx + 1 &&
3293 	    g <= s->last_displayed_entry->idx + 1 &&
3294 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3295 		s->selected = g - s->first_displayed_entry->idx - 1;
3296 		select_commit(s);
3297 		return NULL;
3298 	}
3299 
3300 	if (idx + 1 < g) {
3301 		err = log_move_cursor_down(view, g - idx - 1);
3302 		if (!err && g > s->selected_entry->idx + 1)
3303 			err = log_move_cursor_down(view,
3304 			    g - s->first_displayed_entry->idx - 1);
3305 		if (err)
3306 			return err;
3307 	} else if (idx + 1 > g)
3308 		log_move_cursor_up(view, idx - g + 1, 0);
3309 
3310 	if (g < nlines && s->first_displayed_entry->idx == 0)
3311 		s->selected = g - 1;
3312 
3313 	select_commit(s);
3314 	return NULL;
3315 
3316 }
3317 
3318 static const struct got_error *
3319 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3320 {
3321 	const struct got_error *err = NULL;
3322 	struct tog_log_view_state *s = &view->state.log;
3323 	int eos, nscroll;
3324 
3325 	if (s->thread_args.load_all) {
3326 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3327 			s->thread_args.load_all = 0;
3328 		else if (s->thread_args.log_complete) {
3329 			err = log_move_cursor_down(view, s->commits.ncommits);
3330 			s->thread_args.load_all = 0;
3331 		}
3332 		if (err)
3333 			return err;
3334 	}
3335 
3336 	eos = nscroll = view->nlines - 1;
3337 	if (view_is_hsplit_top(view))
3338 		--eos;  /* border */
3339 
3340 	if (view->gline)
3341 		return log_goto_line(view, eos);
3342 
3343 	switch (ch) {
3344 	case 'q':
3345 		s->quit = 1;
3346 		break;
3347 	case '0':
3348 		view->x = 0;
3349 		break;
3350 	case '$':
3351 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3352 		view->count = 0;
3353 		break;
3354 	case KEY_RIGHT:
3355 	case 'l':
3356 		if (view->x + view->ncols / 2 < view->maxx)
3357 			view->x += 2;  /* move two columns right */
3358 		else
3359 			view->count = 0;
3360 		break;
3361 	case KEY_LEFT:
3362 	case 'h':
3363 		view->x -= MIN(view->x, 2);  /* move two columns back */
3364 		if (view->x <= 0)
3365 			view->count = 0;
3366 		break;
3367 	case 'k':
3368 	case KEY_UP:
3369 	case '<':
3370 	case ',':
3371 	case CTRL('p'):
3372 		log_move_cursor_up(view, 0, 0);
3373 		break;
3374 	case 'g':
3375 	case KEY_HOME:
3376 		log_move_cursor_up(view, 0, 1);
3377 		view->count = 0;
3378 		break;
3379 	case CTRL('u'):
3380 	case 'u':
3381 		nscroll /= 2;
3382 		/* FALL THROUGH */
3383 	case KEY_PPAGE:
3384 	case CTRL('b'):
3385 	case 'b':
3386 		log_move_cursor_up(view, nscroll, 0);
3387 		break;
3388 	case 'j':
3389 	case KEY_DOWN:
3390 	case '>':
3391 	case '.':
3392 	case CTRL('n'):
3393 		err = log_move_cursor_down(view, 0);
3394 		break;
3395 	case '@':
3396 		s->use_committer = !s->use_committer;
3397 		break;
3398 	case 'G':
3399 	case KEY_END: {
3400 		/* We don't know yet how many commits, so we're forced to
3401 		 * traverse them all. */
3402 		view->count = 0;
3403 		s->thread_args.load_all = 1;
3404 		if (!s->thread_args.log_complete)
3405 			return trigger_log_thread(view, 0);
3406 		err = log_move_cursor_down(view, s->commits.ncommits);
3407 		s->thread_args.load_all = 0;
3408 		break;
3409 	}
3410 	case CTRL('d'):
3411 	case 'd':
3412 		nscroll /= 2;
3413 		/* FALL THROUGH */
3414 	case KEY_NPAGE:
3415 	case CTRL('f'):
3416 	case 'f':
3417 	case ' ':
3418 		err = log_move_cursor_down(view, nscroll);
3419 		break;
3420 	case KEY_RESIZE:
3421 		if (s->selected > view->nlines - 2)
3422 			s->selected = view->nlines - 2;
3423 		if (s->selected > s->commits.ncommits - 1)
3424 			s->selected = s->commits.ncommits - 1;
3425 		select_commit(s);
3426 		if (s->commits.ncommits < view->nlines - 1 &&
3427 		    !s->thread_args.log_complete) {
3428 			s->thread_args.commits_needed += (view->nlines - 1) -
3429 			    s->commits.ncommits;
3430 			err = trigger_log_thread(view, 1);
3431 		}
3432 		break;
3433 	case KEY_ENTER:
3434 	case '\r':
3435 		view->count = 0;
3436 		if (s->selected_entry == NULL)
3437 			break;
3438 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3439 		break;
3440 	case 'T':
3441 		view->count = 0;
3442 		if (s->selected_entry == NULL)
3443 			break;
3444 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3445 		break;
3446 	case KEY_BACKSPACE:
3447 	case CTRL('l'):
3448 	case 'B':
3449 		view->count = 0;
3450 		if (ch == KEY_BACKSPACE &&
3451 		    got_path_is_root_dir(s->in_repo_path))
3452 			break;
3453 		err = stop_log_thread(s);
3454 		if (err)
3455 			return err;
3456 		if (ch == KEY_BACKSPACE) {
3457 			char *parent_path;
3458 			err = got_path_dirname(&parent_path, s->in_repo_path);
3459 			if (err)
3460 				return err;
3461 			free(s->in_repo_path);
3462 			s->in_repo_path = parent_path;
3463 			s->thread_args.in_repo_path = s->in_repo_path;
3464 		} else if (ch == CTRL('l')) {
3465 			struct got_object_id *start_id;
3466 			err = got_repo_match_object_id(&start_id, NULL,
3467 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3468 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3469 			if (err)
3470 				return err;
3471 			free(s->start_id);
3472 			s->start_id = start_id;
3473 			s->thread_args.start_id = s->start_id;
3474 		} else /* 'B' */
3475 			s->log_branches = !s->log_branches;
3476 
3477 		if (s->thread_args.pack_fds == NULL) {
3478 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3479 			if (err)
3480 				return err;
3481 		}
3482 		err = got_repo_open(&s->thread_args.repo,
3483 		    got_repo_get_path(s->repo), NULL,
3484 		    s->thread_args.pack_fds);
3485 		if (err)
3486 			return err;
3487 		tog_free_refs();
3488 		err = tog_load_refs(s->repo, 0);
3489 		if (err)
3490 			return err;
3491 		err = got_commit_graph_open(&s->thread_args.graph,
3492 		    s->in_repo_path, !s->log_branches);
3493 		if (err)
3494 			return err;
3495 		err = got_commit_graph_iter_start(s->thread_args.graph,
3496 		    s->start_id, s->repo, NULL, NULL);
3497 		if (err)
3498 			return err;
3499 		free_commits(&s->commits);
3500 		s->first_displayed_entry = NULL;
3501 		s->last_displayed_entry = NULL;
3502 		s->selected_entry = NULL;
3503 		s->selected = 0;
3504 		s->thread_args.log_complete = 0;
3505 		s->quit = 0;
3506 		s->thread_args.commits_needed = view->lines;
3507 		s->matched_entry = NULL;
3508 		s->search_entry = NULL;
3509 		view->offset = 0;
3510 		break;
3511 	case 'R':
3512 		view->count = 0;
3513 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3514 		break;
3515 	default:
3516 		view->count = 0;
3517 		break;
3518 	}
3519 
3520 	return err;
3521 }
3522 
3523 static const struct got_error *
3524 apply_unveil(const char *repo_path, const char *worktree_path)
3525 {
3526 	const struct got_error *error;
3527 
3528 #ifdef PROFILE
3529 	if (unveil("gmon.out", "rwc") != 0)
3530 		return got_error_from_errno2("unveil", "gmon.out");
3531 #endif
3532 	if (repo_path && unveil(repo_path, "r") != 0)
3533 		return got_error_from_errno2("unveil", repo_path);
3534 
3535 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3536 		return got_error_from_errno2("unveil", worktree_path);
3537 
3538 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3539 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3540 
3541 	error = got_privsep_unveil_exec_helpers();
3542 	if (error != NULL)
3543 		return error;
3544 
3545 	if (unveil(NULL, NULL) != 0)
3546 		return got_error_from_errno("unveil");
3547 
3548 	return NULL;
3549 }
3550 
3551 static void
3552 init_curses(void)
3553 {
3554 	/*
3555 	 * Override default signal handlers before starting ncurses.
3556 	 * This should prevent ncurses from installing its own
3557 	 * broken cleanup() signal handler.
3558 	 */
3559 	signal(SIGWINCH, tog_sigwinch);
3560 	signal(SIGPIPE, tog_sigpipe);
3561 	signal(SIGCONT, tog_sigcont);
3562 	signal(SIGINT, tog_sigint);
3563 	signal(SIGTERM, tog_sigterm);
3564 
3565 	initscr();
3566 	cbreak();
3567 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3568 	noecho();
3569 	nonl();
3570 	intrflush(stdscr, FALSE);
3571 	keypad(stdscr, TRUE);
3572 	curs_set(0);
3573 	if (getenv("TOG_COLORS") != NULL) {
3574 		start_color();
3575 		use_default_colors();
3576 	}
3577 }
3578 
3579 static const struct got_error *
3580 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3581     struct got_repository *repo, struct got_worktree *worktree)
3582 {
3583 	const struct got_error *err = NULL;
3584 
3585 	if (argc == 0) {
3586 		*in_repo_path = strdup("/");
3587 		if (*in_repo_path == NULL)
3588 			return got_error_from_errno("strdup");
3589 		return NULL;
3590 	}
3591 
3592 	if (worktree) {
3593 		const char *prefix = got_worktree_get_path_prefix(worktree);
3594 		char *p;
3595 
3596 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3597 		if (err)
3598 			return err;
3599 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3600 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3601 		    p) == -1) {
3602 			err = got_error_from_errno("asprintf");
3603 			*in_repo_path = NULL;
3604 		}
3605 		free(p);
3606 	} else
3607 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3608 
3609 	return err;
3610 }
3611 
3612 static const struct got_error *
3613 cmd_log(int argc, char *argv[])
3614 {
3615 	const struct got_error *error;
3616 	struct got_repository *repo = NULL;
3617 	struct got_worktree *worktree = NULL;
3618 	struct got_object_id *start_id = NULL;
3619 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3620 	char *start_commit = NULL, *label = NULL;
3621 	struct got_reference *ref = NULL;
3622 	const char *head_ref_name = NULL;
3623 	int ch, log_branches = 0;
3624 	struct tog_view *view;
3625 	int *pack_fds = NULL;
3626 
3627 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3628 		switch (ch) {
3629 		case 'b':
3630 			log_branches = 1;
3631 			break;
3632 		case 'c':
3633 			start_commit = optarg;
3634 			break;
3635 		case 'r':
3636 			repo_path = realpath(optarg, NULL);
3637 			if (repo_path == NULL)
3638 				return got_error_from_errno2("realpath",
3639 				    optarg);
3640 			break;
3641 		default:
3642 			usage_log();
3643 			/* NOTREACHED */
3644 		}
3645 	}
3646 
3647 	argc -= optind;
3648 	argv += optind;
3649 
3650 	if (argc > 1)
3651 		usage_log();
3652 
3653 	error = got_repo_pack_fds_open(&pack_fds);
3654 	if (error != NULL)
3655 		goto done;
3656 
3657 	if (repo_path == NULL) {
3658 		cwd = getcwd(NULL, 0);
3659 		if (cwd == NULL)
3660 			return got_error_from_errno("getcwd");
3661 		error = got_worktree_open(&worktree, cwd);
3662 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3663 			goto done;
3664 		if (worktree)
3665 			repo_path =
3666 			    strdup(got_worktree_get_repo_path(worktree));
3667 		else
3668 			repo_path = strdup(cwd);
3669 		if (repo_path == NULL) {
3670 			error = got_error_from_errno("strdup");
3671 			goto done;
3672 		}
3673 	}
3674 
3675 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3676 	if (error != NULL)
3677 		goto done;
3678 
3679 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3680 	    repo, worktree);
3681 	if (error)
3682 		goto done;
3683 
3684 	init_curses();
3685 
3686 	error = apply_unveil(got_repo_get_path(repo),
3687 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3688 	if (error)
3689 		goto done;
3690 
3691 	/* already loaded by tog_log_with_path()? */
3692 	if (TAILQ_EMPTY(&tog_refs)) {
3693 		error = tog_load_refs(repo, 0);
3694 		if (error)
3695 			goto done;
3696 	}
3697 
3698 	if (start_commit == NULL) {
3699 		error = got_repo_match_object_id(&start_id, &label,
3700 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3701 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3702 		if (error)
3703 			goto done;
3704 		head_ref_name = label;
3705 	} else {
3706 		error = got_ref_open(&ref, repo, start_commit, 0);
3707 		if (error == NULL)
3708 			head_ref_name = got_ref_get_name(ref);
3709 		else if (error->code != GOT_ERR_NOT_REF)
3710 			goto done;
3711 		error = got_repo_match_object_id(&start_id, NULL,
3712 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3713 		if (error)
3714 			goto done;
3715 	}
3716 
3717 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3718 	if (view == NULL) {
3719 		error = got_error_from_errno("view_open");
3720 		goto done;
3721 	}
3722 	error = open_log_view(view, start_id, repo, head_ref_name,
3723 	    in_repo_path, log_branches);
3724 	if (error)
3725 		goto done;
3726 	if (worktree) {
3727 		/* Release work tree lock. */
3728 		got_worktree_close(worktree);
3729 		worktree = NULL;
3730 	}
3731 	error = view_loop(view);
3732 done:
3733 	free(in_repo_path);
3734 	free(repo_path);
3735 	free(cwd);
3736 	free(start_id);
3737 	free(label);
3738 	if (ref)
3739 		got_ref_close(ref);
3740 	if (repo) {
3741 		const struct got_error *close_err = got_repo_close(repo);
3742 		if (error == NULL)
3743 			error = close_err;
3744 	}
3745 	if (worktree)
3746 		got_worktree_close(worktree);
3747 	if (pack_fds) {
3748 		const struct got_error *pack_err =
3749 		    got_repo_pack_fds_close(pack_fds);
3750 		if (error == NULL)
3751 			error = pack_err;
3752 	}
3753 	tog_free_refs();
3754 	return error;
3755 }
3756 
3757 __dead static void
3758 usage_diff(void)
3759 {
3760 	endwin();
3761 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
3762 	    "object1 object2\n", getprogname());
3763 	exit(1);
3764 }
3765 
3766 static int
3767 match_line(const char *line, regex_t *regex, size_t nmatch,
3768     regmatch_t *regmatch)
3769 {
3770 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3771 }
3772 
3773 static struct tog_color *
3774 match_color(struct tog_colors *colors, const char *line)
3775 {
3776 	struct tog_color *tc = NULL;
3777 
3778 	STAILQ_FOREACH(tc, colors, entry) {
3779 		if (match_line(line, &tc->regex, 0, NULL))
3780 			return tc;
3781 	}
3782 
3783 	return NULL;
3784 }
3785 
3786 static const struct got_error *
3787 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3788     WINDOW *window, int skipcol, regmatch_t *regmatch)
3789 {
3790 	const struct got_error *err = NULL;
3791 	char *exstr = NULL;
3792 	wchar_t *wline = NULL;
3793 	int rme, rms, n, width, scrollx;
3794 	int width0 = 0, width1 = 0, width2 = 0;
3795 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3796 
3797 	*wtotal = 0;
3798 
3799 	rms = regmatch->rm_so;
3800 	rme = regmatch->rm_eo;
3801 
3802 	err = expand_tab(&exstr, line);
3803 	if (err)
3804 		return err;
3805 
3806 	/* Split the line into 3 segments, according to match offsets. */
3807 	seg0 = strndup(exstr, rms);
3808 	if (seg0 == NULL) {
3809 		err = got_error_from_errno("strndup");
3810 		goto done;
3811 	}
3812 	seg1 = strndup(exstr + rms, rme - rms);
3813 	if (seg1 == NULL) {
3814 		err = got_error_from_errno("strndup");
3815 		goto done;
3816 	}
3817 	seg2 = strdup(exstr + rme);
3818 	if (seg2 == NULL) {
3819 		err = got_error_from_errno("strndup");
3820 		goto done;
3821 	}
3822 
3823 	/* draw up to matched token if we haven't scrolled past it */
3824 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3825 	    col_tab_align, 1);
3826 	if (err)
3827 		goto done;
3828 	n = MAX(width0 - skipcol, 0);
3829 	if (n) {
3830 		free(wline);
3831 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3832 		    wlimit, col_tab_align, 1);
3833 		if (err)
3834 			goto done;
3835 		waddwstr(window, &wline[scrollx]);
3836 		wlimit -= width;
3837 		*wtotal += width;
3838 	}
3839 
3840 	if (wlimit > 0) {
3841 		int i = 0, w = 0;
3842 		size_t wlen;
3843 
3844 		free(wline);
3845 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3846 		    col_tab_align, 1);
3847 		if (err)
3848 			goto done;
3849 		wlen = wcslen(wline);
3850 		while (i < wlen) {
3851 			width = wcwidth(wline[i]);
3852 			if (width == -1) {
3853 				/* should not happen, tabs are expanded */
3854 				err = got_error(GOT_ERR_RANGE);
3855 				goto done;
3856 			}
3857 			if (width0 + w + width > skipcol)
3858 				break;
3859 			w += width;
3860 			i++;
3861 		}
3862 		/* draw (visible part of) matched token (if scrolled into it) */
3863 		if (width1 - w > 0) {
3864 			wattron(window, A_STANDOUT);
3865 			waddwstr(window, &wline[i]);
3866 			wattroff(window, A_STANDOUT);
3867 			wlimit -= (width1 - w);
3868 			*wtotal += (width1 - w);
3869 		}
3870 	}
3871 
3872 	if (wlimit > 0) {  /* draw rest of line */
3873 		free(wline);
3874 		if (skipcol > width0 + width1) {
3875 			err = format_line(&wline, &width2, &scrollx, seg2,
3876 			    skipcol - (width0 + width1), wlimit,
3877 			    col_tab_align, 1);
3878 			if (err)
3879 				goto done;
3880 			waddwstr(window, &wline[scrollx]);
3881 		} else {
3882 			err = format_line(&wline, &width2, NULL, seg2, 0,
3883 			    wlimit, col_tab_align, 1);
3884 			if (err)
3885 				goto done;
3886 			waddwstr(window, wline);
3887 		}
3888 		*wtotal += width2;
3889 	}
3890 done:
3891 	free(wline);
3892 	free(exstr);
3893 	free(seg0);
3894 	free(seg1);
3895 	free(seg2);
3896 	return err;
3897 }
3898 
3899 static int
3900 gotoline(struct tog_view *view, int *lineno, int *nprinted)
3901 {
3902 	FILE	*f = NULL;
3903 	int	*eof, *first, *selected;
3904 
3905 	if (view->type == TOG_VIEW_DIFF) {
3906 		struct tog_diff_view_state *s = &view->state.diff;
3907 
3908 		first = &s->first_displayed_line;
3909 		selected = first;
3910 		eof = &s->eof;
3911 		f = s->f;
3912 	} else if (view->type == TOG_VIEW_BLAME) {
3913 		struct tog_blame_view_state *s = &view->state.blame;
3914 
3915 		first = &s->first_displayed_line;
3916 		selected = &s->selected_line;
3917 		eof = &s->eof;
3918 		f = s->blame.f;
3919 	} else
3920 		return 0;
3921 
3922 	/* Center gline in the middle of the page like vi(1). */
3923 	if (*lineno < view->gline - (view->nlines - 3) / 2)
3924 		return 0;
3925 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
3926 		rewind(f);
3927 		*eof = 0;
3928 		*first = 1;
3929 		*lineno = 0;
3930 		*nprinted = 0;
3931 		return 0;
3932 	}
3933 
3934 	*selected = view->gline <= (view->nlines - 3) / 2 ?
3935 		view->gline : (view->nlines - 3) / 2 + 1;
3936 	view->gline = 0;
3937 
3938 	return 1;
3939 }
3940 
3941 static const struct got_error *
3942 draw_file(struct tog_view *view, const char *header)
3943 {
3944 	struct tog_diff_view_state *s = &view->state.diff;
3945 	regmatch_t *regmatch = &view->regmatch;
3946 	const struct got_error *err;
3947 	int nprinted = 0;
3948 	char *line;
3949 	size_t linesize = 0;
3950 	ssize_t linelen;
3951 	wchar_t *wline;
3952 	int width;
3953 	int max_lines = view->nlines;
3954 	int nlines = s->nlines;
3955 	off_t line_offset;
3956 
3957 	s->lineno = s->first_displayed_line - 1;
3958 	line_offset = s->lines[s->first_displayed_line - 1].offset;
3959 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3960 		return got_error_from_errno("fseek");
3961 
3962 	werase(view->window);
3963 
3964 	if (view->gline > s->nlines - 1)
3965 		view->gline = s->nlines - 1;
3966 
3967 	if (header) {
3968 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
3969 		    1 : view->gline - (view->nlines - 3) / 2 :
3970 		    s->lineno + s->selected_line;
3971 
3972 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
3973 			return got_error_from_errno("asprintf");
3974 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3975 		    0, 0);
3976 		free(line);
3977 		if (err)
3978 			return err;
3979 
3980 		if (view_needs_focus_indication(view))
3981 			wstandout(view->window);
3982 		waddwstr(view->window, wline);
3983 		free(wline);
3984 		wline = NULL;
3985 		if (view_needs_focus_indication(view))
3986 			wstandend(view->window);
3987 		if (width <= view->ncols - 1)
3988 			waddch(view->window, '\n');
3989 
3990 		if (max_lines <= 1)
3991 			return NULL;
3992 		max_lines--;
3993 	}
3994 
3995 	s->eof = 0;
3996 	view->maxx = 0;
3997 	line = NULL;
3998 	while (max_lines > 0 && nprinted < max_lines) {
3999 		enum got_diff_line_type linetype;
4000 		attr_t attr = 0;
4001 
4002 		linelen = getline(&line, &linesize, s->f);
4003 		if (linelen == -1) {
4004 			if (feof(s->f)) {
4005 				s->eof = 1;
4006 				break;
4007 			}
4008 			free(line);
4009 			return got_ferror(s->f, GOT_ERR_IO);
4010 		}
4011 
4012 		if (++s->lineno < s->first_displayed_line)
4013 			continue;
4014 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4015 			continue;
4016 		if (s->lineno == view->hiline)
4017 			attr = A_STANDOUT;
4018 
4019 		/* Set view->maxx based on full line length. */
4020 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4021 		    view->x ? 1 : 0);
4022 		if (err) {
4023 			free(line);
4024 			return err;
4025 		}
4026 		view->maxx = MAX(view->maxx, width);
4027 		free(wline);
4028 		wline = NULL;
4029 
4030 		linetype = s->lines[s->lineno].type;
4031 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4032 		    linetype < GOT_DIFF_LINE_CONTEXT)
4033 			attr |= COLOR_PAIR(linetype);
4034 		if (attr)
4035 			wattron(view->window, attr);
4036 		if (s->first_displayed_line + nprinted == s->matched_line &&
4037 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4038 			err = add_matched_line(&width, line, view->ncols, 0,
4039 			    view->window, view->x, regmatch);
4040 			if (err) {
4041 				free(line);
4042 				return err;
4043 			}
4044 		} else {
4045 			int skip;
4046 			err = format_line(&wline, &width, &skip, line,
4047 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4048 			if (err) {
4049 				free(line);
4050 				return err;
4051 			}
4052 			waddwstr(view->window, &wline[skip]);
4053 			free(wline);
4054 			wline = NULL;
4055 		}
4056 		if (s->lineno == view->hiline) {
4057 			/* highlight full gline length */
4058 			while (width++ < view->ncols)
4059 				waddch(view->window, ' ');
4060 		} else {
4061 			if (width <= view->ncols - 1)
4062 				waddch(view->window, '\n');
4063 		}
4064 		if (attr)
4065 			wattroff(view->window, attr);
4066 		if (++nprinted == 1)
4067 			s->first_displayed_line = s->lineno;
4068 	}
4069 	free(line);
4070 	if (nprinted >= 1)
4071 		s->last_displayed_line = s->first_displayed_line +
4072 		    (nprinted - 1);
4073 	else
4074 		s->last_displayed_line = s->first_displayed_line;
4075 
4076 	view_border(view);
4077 
4078 	if (s->eof) {
4079 		while (nprinted < view->nlines) {
4080 			waddch(view->window, '\n');
4081 			nprinted++;
4082 		}
4083 
4084 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4085 		    view->ncols, 0, 0);
4086 		if (err) {
4087 			return err;
4088 		}
4089 
4090 		wstandout(view->window);
4091 		waddwstr(view->window, wline);
4092 		free(wline);
4093 		wline = NULL;
4094 		wstandend(view->window);
4095 	}
4096 
4097 	return NULL;
4098 }
4099 
4100 static char *
4101 get_datestr(time_t *time, char *datebuf)
4102 {
4103 	struct tm mytm, *tm;
4104 	char *p, *s;
4105 
4106 	tm = gmtime_r(time, &mytm);
4107 	if (tm == NULL)
4108 		return NULL;
4109 	s = asctime_r(tm, datebuf);
4110 	if (s == NULL)
4111 		return NULL;
4112 	p = strchr(s, '\n');
4113 	if (p)
4114 		*p = '\0';
4115 	return s;
4116 }
4117 
4118 static const struct got_error *
4119 get_changed_paths(struct got_pathlist_head *paths,
4120     struct got_commit_object *commit, struct got_repository *repo)
4121 {
4122 	const struct got_error *err = NULL;
4123 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4124 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4125 	struct got_object_qid *qid;
4126 
4127 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4128 	if (qid != NULL) {
4129 		struct got_commit_object *pcommit;
4130 		err = got_object_open_as_commit(&pcommit, repo,
4131 		    &qid->id);
4132 		if (err)
4133 			return err;
4134 
4135 		tree_id1 = got_object_id_dup(
4136 		    got_object_commit_get_tree_id(pcommit));
4137 		if (tree_id1 == NULL) {
4138 			got_object_commit_close(pcommit);
4139 			return got_error_from_errno("got_object_id_dup");
4140 		}
4141 		got_object_commit_close(pcommit);
4142 
4143 	}
4144 
4145 	if (tree_id1) {
4146 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4147 		if (err)
4148 			goto done;
4149 	}
4150 
4151 	tree_id2 = got_object_commit_get_tree_id(commit);
4152 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4153 	if (err)
4154 		goto done;
4155 
4156 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4157 	    got_diff_tree_collect_changed_paths, paths, 0);
4158 done:
4159 	if (tree1)
4160 		got_object_tree_close(tree1);
4161 	if (tree2)
4162 		got_object_tree_close(tree2);
4163 	free(tree_id1);
4164 	return err;
4165 }
4166 
4167 static const struct got_error *
4168 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4169     off_t off, uint8_t type)
4170 {
4171 	struct got_diff_line *p;
4172 
4173 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4174 	if (p == NULL)
4175 		return got_error_from_errno("reallocarray");
4176 	*lines = p;
4177 	(*lines)[*nlines].offset = off;
4178 	(*lines)[*nlines].type = type;
4179 	(*nlines)++;
4180 
4181 	return NULL;
4182 }
4183 
4184 static const struct got_error *
4185 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4186     struct got_object_id *commit_id, struct got_reflist_head *refs,
4187     struct got_repository *repo, FILE *outfile)
4188 {
4189 	const struct got_error *err = NULL;
4190 	char datebuf[26], *datestr;
4191 	struct got_commit_object *commit;
4192 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4193 	time_t committer_time;
4194 	const char *author, *committer;
4195 	char *refs_str = NULL;
4196 	struct got_pathlist_head changed_paths;
4197 	struct got_pathlist_entry *pe;
4198 	off_t outoff = 0;
4199 	int n;
4200 
4201 	TAILQ_INIT(&changed_paths);
4202 
4203 	if (refs) {
4204 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4205 		if (err)
4206 			return err;
4207 	}
4208 
4209 	err = got_object_open_as_commit(&commit, repo, commit_id);
4210 	if (err)
4211 		return err;
4212 
4213 	err = got_object_id_str(&id_str, commit_id);
4214 	if (err) {
4215 		err = got_error_from_errno("got_object_id_str");
4216 		goto done;
4217 	}
4218 
4219 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4220 	if (err)
4221 		goto done;
4222 
4223 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4224 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4225 	if (n < 0) {
4226 		err = got_error_from_errno("fprintf");
4227 		goto done;
4228 	}
4229 	outoff += n;
4230 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4231 	if (err)
4232 		goto done;
4233 
4234 	n = fprintf(outfile, "from: %s\n",
4235 	    got_object_commit_get_author(commit));
4236 	if (n < 0) {
4237 		err = got_error_from_errno("fprintf");
4238 		goto done;
4239 	}
4240 	outoff += n;
4241 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4242 	if (err)
4243 		goto done;
4244 
4245 	committer_time = got_object_commit_get_committer_time(commit);
4246 	datestr = get_datestr(&committer_time, datebuf);
4247 	if (datestr) {
4248 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4249 		if (n < 0) {
4250 			err = got_error_from_errno("fprintf");
4251 			goto done;
4252 		}
4253 		outoff += n;
4254 		err = add_line_metadata(lines, nlines, outoff,
4255 		    GOT_DIFF_LINE_DATE);
4256 		if (err)
4257 			goto done;
4258 	}
4259 	author = got_object_commit_get_author(commit);
4260 	committer = got_object_commit_get_committer(commit);
4261 	if (strcmp(author, committer) != 0) {
4262 		n = fprintf(outfile, "via: %s\n", committer);
4263 		if (n < 0) {
4264 			err = got_error_from_errno("fprintf");
4265 			goto done;
4266 		}
4267 		outoff += n;
4268 		err = add_line_metadata(lines, nlines, outoff,
4269 		    GOT_DIFF_LINE_AUTHOR);
4270 		if (err)
4271 			goto done;
4272 	}
4273 	if (got_object_commit_get_nparents(commit) > 1) {
4274 		const struct got_object_id_queue *parent_ids;
4275 		struct got_object_qid *qid;
4276 		int pn = 1;
4277 		parent_ids = got_object_commit_get_parent_ids(commit);
4278 		STAILQ_FOREACH(qid, parent_ids, entry) {
4279 			err = got_object_id_str(&id_str, &qid->id);
4280 			if (err)
4281 				goto done;
4282 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4283 			if (n < 0) {
4284 				err = got_error_from_errno("fprintf");
4285 				goto done;
4286 			}
4287 			outoff += n;
4288 			err = add_line_metadata(lines, nlines, outoff,
4289 			    GOT_DIFF_LINE_META);
4290 			if (err)
4291 				goto done;
4292 			free(id_str);
4293 			id_str = NULL;
4294 		}
4295 	}
4296 
4297 	err = got_object_commit_get_logmsg(&logmsg, commit);
4298 	if (err)
4299 		goto done;
4300 	s = logmsg;
4301 	while ((line = strsep(&s, "\n")) != NULL) {
4302 		n = fprintf(outfile, "%s\n", line);
4303 		if (n < 0) {
4304 			err = got_error_from_errno("fprintf");
4305 			goto done;
4306 		}
4307 		outoff += n;
4308 		err = add_line_metadata(lines, nlines, outoff,
4309 		    GOT_DIFF_LINE_LOGMSG);
4310 		if (err)
4311 			goto done;
4312 	}
4313 
4314 	err = get_changed_paths(&changed_paths, commit, repo);
4315 	if (err)
4316 		goto done;
4317 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4318 		struct got_diff_changed_path *cp = pe->data;
4319 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4320 		if (n < 0) {
4321 			err = got_error_from_errno("fprintf");
4322 			goto done;
4323 		}
4324 		outoff += n;
4325 		err = add_line_metadata(lines, nlines, outoff,
4326 		    GOT_DIFF_LINE_CHANGES);
4327 		if (err)
4328 			goto done;
4329 		free((char *)pe->path);
4330 		free(pe->data);
4331 	}
4332 
4333 	fputc('\n', outfile);
4334 	outoff++;
4335 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4336 done:
4337 	got_pathlist_free(&changed_paths);
4338 	free(id_str);
4339 	free(logmsg);
4340 	free(refs_str);
4341 	got_object_commit_close(commit);
4342 	if (err) {
4343 		free(*lines);
4344 		*lines = NULL;
4345 		*nlines = 0;
4346 	}
4347 	return err;
4348 }
4349 
4350 static const struct got_error *
4351 create_diff(struct tog_diff_view_state *s)
4352 {
4353 	const struct got_error *err = NULL;
4354 	FILE *f = NULL;
4355 	int obj_type;
4356 
4357 	free(s->lines);
4358 	s->lines = malloc(sizeof(*s->lines));
4359 	if (s->lines == NULL)
4360 		return got_error_from_errno("malloc");
4361 	s->nlines = 0;
4362 
4363 	f = got_opentemp();
4364 	if (f == NULL) {
4365 		err = got_error_from_errno("got_opentemp");
4366 		goto done;
4367 	}
4368 	if (s->f && fclose(s->f) == EOF) {
4369 		err = got_error_from_errno("fclose");
4370 		goto done;
4371 	}
4372 	s->f = f;
4373 
4374 	if (s->id1)
4375 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4376 	else
4377 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4378 	if (err)
4379 		goto done;
4380 
4381 	switch (obj_type) {
4382 	case GOT_OBJ_TYPE_BLOB:
4383 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4384 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4385 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4386 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4387 		break;
4388 	case GOT_OBJ_TYPE_TREE:
4389 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4390 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4391 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4392 		    s->force_text_diff, s->repo, s->f);
4393 		break;
4394 	case GOT_OBJ_TYPE_COMMIT: {
4395 		const struct got_object_id_queue *parent_ids;
4396 		struct got_object_qid *pid;
4397 		struct got_commit_object *commit2;
4398 		struct got_reflist_head *refs;
4399 
4400 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4401 		if (err)
4402 			goto done;
4403 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4404 		/* Show commit info if we're diffing to a parent/root commit. */
4405 		if (s->id1 == NULL) {
4406 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4407 			    refs, s->repo, s->f);
4408 			if (err)
4409 				goto done;
4410 		} else {
4411 			parent_ids = got_object_commit_get_parent_ids(commit2);
4412 			STAILQ_FOREACH(pid, parent_ids, entry) {
4413 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4414 					err = write_commit_info(&s->lines,
4415 					    &s->nlines, s->id2, refs, s->repo,
4416 					    s->f);
4417 					if (err)
4418 						goto done;
4419 					break;
4420 				}
4421 			}
4422 		}
4423 		got_object_commit_close(commit2);
4424 
4425 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4426 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4427 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4428 		    s->force_text_diff, s->repo, s->f);
4429 		break;
4430 	}
4431 	default:
4432 		err = got_error(GOT_ERR_OBJ_TYPE);
4433 		break;
4434 	}
4435 done:
4436 	if (s->f && fflush(s->f) != 0 && err == NULL)
4437 		err = got_error_from_errno("fflush");
4438 	return err;
4439 }
4440 
4441 static void
4442 diff_view_indicate_progress(struct tog_view *view)
4443 {
4444 	mvwaddstr(view->window, 0, 0, "diffing...");
4445 	update_panels();
4446 	doupdate();
4447 }
4448 
4449 static const struct got_error *
4450 search_start_diff_view(struct tog_view *view)
4451 {
4452 	struct tog_diff_view_state *s = &view->state.diff;
4453 
4454 	s->matched_line = 0;
4455 	return NULL;
4456 }
4457 
4458 static const struct got_error *
4459 search_next_diff_view(struct tog_view *view)
4460 {
4461 	struct tog_diff_view_state *s = &view->state.diff;
4462 	const struct got_error *err = NULL;
4463 	int lineno;
4464 	char *line = NULL;
4465 	size_t linesize = 0;
4466 	ssize_t linelen;
4467 
4468 	if (!view->searching) {
4469 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4470 		return NULL;
4471 	}
4472 
4473 	if (s->matched_line) {
4474 		if (view->searching == TOG_SEARCH_FORWARD)
4475 			lineno = s->matched_line + 1;
4476 		else
4477 			lineno = s->matched_line - 1;
4478 	} else
4479 		lineno = s->first_displayed_line;
4480 
4481 	while (1) {
4482 		off_t offset;
4483 
4484 		if (lineno <= 0 || lineno > s->nlines) {
4485 			if (s->matched_line == 0) {
4486 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4487 				break;
4488 			}
4489 
4490 			if (view->searching == TOG_SEARCH_FORWARD)
4491 				lineno = 1;
4492 			else
4493 				lineno = s->nlines;
4494 		}
4495 
4496 		offset = s->lines[lineno - 1].offset;
4497 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4498 			free(line);
4499 			return got_error_from_errno("fseeko");
4500 		}
4501 		linelen = getline(&line, &linesize, s->f);
4502 		if (linelen != -1) {
4503 			char *exstr;
4504 			err = expand_tab(&exstr, line);
4505 			if (err)
4506 				break;
4507 			if (match_line(exstr, &view->regex, 1,
4508 			    &view->regmatch)) {
4509 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4510 				s->matched_line = lineno;
4511 				free(exstr);
4512 				break;
4513 			}
4514 			free(exstr);
4515 		}
4516 		if (view->searching == TOG_SEARCH_FORWARD)
4517 			lineno++;
4518 		else
4519 			lineno--;
4520 	}
4521 	free(line);
4522 
4523 	if (s->matched_line) {
4524 		s->first_displayed_line = s->matched_line;
4525 		s->selected_line = 1;
4526 	}
4527 
4528 	return err;
4529 }
4530 
4531 static const struct got_error *
4532 close_diff_view(struct tog_view *view)
4533 {
4534 	const struct got_error *err = NULL;
4535 	struct tog_diff_view_state *s = &view->state.diff;
4536 
4537 	free(s->id1);
4538 	s->id1 = NULL;
4539 	free(s->id2);
4540 	s->id2 = NULL;
4541 	if (s->f && fclose(s->f) == EOF)
4542 		err = got_error_from_errno("fclose");
4543 	s->f = NULL;
4544 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4545 		err = got_error_from_errno("fclose");
4546 	s->f1 = NULL;
4547 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4548 		err = got_error_from_errno("fclose");
4549 	s->f2 = NULL;
4550 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4551 		err = got_error_from_errno("close");
4552 	s->fd1 = -1;
4553 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4554 		err = got_error_from_errno("close");
4555 	s->fd2 = -1;
4556 	free(s->lines);
4557 	s->lines = NULL;
4558 	s->nlines = 0;
4559 	return err;
4560 }
4561 
4562 static const struct got_error *
4563 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4564     struct got_object_id *id2, const char *label1, const char *label2,
4565     int diff_context, int ignore_whitespace, int force_text_diff,
4566     struct tog_view *parent_view, struct got_repository *repo)
4567 {
4568 	const struct got_error *err;
4569 	struct tog_diff_view_state *s = &view->state.diff;
4570 
4571 	memset(s, 0, sizeof(*s));
4572 	s->fd1 = -1;
4573 	s->fd2 = -1;
4574 
4575 	if (id1 != NULL && id2 != NULL) {
4576 	    int type1, type2;
4577 	    err = got_object_get_type(&type1, repo, id1);
4578 	    if (err)
4579 		return err;
4580 	    err = got_object_get_type(&type2, repo, id2);
4581 	    if (err)
4582 		return err;
4583 
4584 	    if (type1 != type2)
4585 		return got_error(GOT_ERR_OBJ_TYPE);
4586 	}
4587 	s->first_displayed_line = 1;
4588 	s->last_displayed_line = view->nlines;
4589 	s->selected_line = 1;
4590 	s->repo = repo;
4591 	s->id1 = id1;
4592 	s->id2 = id2;
4593 	s->label1 = label1;
4594 	s->label2 = label2;
4595 
4596 	if (id1) {
4597 		s->id1 = got_object_id_dup(id1);
4598 		if (s->id1 == NULL)
4599 			return got_error_from_errno("got_object_id_dup");
4600 	} else
4601 		s->id1 = NULL;
4602 
4603 	s->id2 = got_object_id_dup(id2);
4604 	if (s->id2 == NULL) {
4605 		err = got_error_from_errno("got_object_id_dup");
4606 		goto done;
4607 	}
4608 
4609 	s->f1 = got_opentemp();
4610 	if (s->f1 == NULL) {
4611 		err = got_error_from_errno("got_opentemp");
4612 		goto done;
4613 	}
4614 
4615 	s->f2 = got_opentemp();
4616 	if (s->f2 == NULL) {
4617 		err = got_error_from_errno("got_opentemp");
4618 		goto done;
4619 	}
4620 
4621 	s->fd1 = got_opentempfd();
4622 	if (s->fd1 == -1) {
4623 		err = got_error_from_errno("got_opentempfd");
4624 		goto done;
4625 	}
4626 
4627 	s->fd2 = got_opentempfd();
4628 	if (s->fd2 == -1) {
4629 		err = got_error_from_errno("got_opentempfd");
4630 		goto done;
4631 	}
4632 
4633 	s->first_displayed_line = 1;
4634 	s->last_displayed_line = view->nlines;
4635 	s->diff_context = diff_context;
4636 	s->ignore_whitespace = ignore_whitespace;
4637 	s->force_text_diff = force_text_diff;
4638 	s->parent_view = parent_view;
4639 	s->repo = repo;
4640 
4641 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4642 		int rc;
4643 
4644 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4645 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4646 		if (rc != ERR)
4647 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4648 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4649 		if (rc != ERR)
4650 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4651 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4652 		if (rc != ERR)
4653 			rc = init_pair(GOT_DIFF_LINE_META,
4654 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4655 		if (rc != ERR)
4656 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4657 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4658 		if (rc != ERR)
4659 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4660 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4661 		if (rc != ERR)
4662 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4663 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4664 		if (rc != ERR)
4665 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4666 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4667 		if (rc != ERR)
4668 			rc = init_pair(GOT_DIFF_LINE_DATE,
4669 			    get_color_value("TOG_COLOR_DATE"), -1);
4670 		if (rc == ERR) {
4671 			err = got_error(GOT_ERR_RANGE);
4672 			goto done;
4673 		}
4674 	}
4675 
4676 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4677 	    view_is_splitscreen(view))
4678 		show_log_view(parent_view); /* draw border */
4679 	diff_view_indicate_progress(view);
4680 
4681 	err = create_diff(s);
4682 
4683 	view->show = show_diff_view;
4684 	view->input = input_diff_view;
4685 	view->reset = reset_diff_view;
4686 	view->close = close_diff_view;
4687 	view->search_start = search_start_diff_view;
4688 	view->search_next = search_next_diff_view;
4689 done:
4690 	if (err)
4691 		close_diff_view(view);
4692 	return err;
4693 }
4694 
4695 static const struct got_error *
4696 show_diff_view(struct tog_view *view)
4697 {
4698 	const struct got_error *err;
4699 	struct tog_diff_view_state *s = &view->state.diff;
4700 	char *id_str1 = NULL, *id_str2, *header;
4701 	const char *label1, *label2;
4702 
4703 	if (s->id1) {
4704 		err = got_object_id_str(&id_str1, s->id1);
4705 		if (err)
4706 			return err;
4707 		label1 = s->label1 ? s->label1 : id_str1;
4708 	} else
4709 		label1 = "/dev/null";
4710 
4711 	err = got_object_id_str(&id_str2, s->id2);
4712 	if (err)
4713 		return err;
4714 	label2 = s->label2 ? s->label2 : id_str2;
4715 
4716 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4717 		err = got_error_from_errno("asprintf");
4718 		free(id_str1);
4719 		free(id_str2);
4720 		return err;
4721 	}
4722 	free(id_str1);
4723 	free(id_str2);
4724 
4725 	err = draw_file(view, header);
4726 	free(header);
4727 	return err;
4728 }
4729 
4730 static const struct got_error *
4731 set_selected_commit(struct tog_diff_view_state *s,
4732     struct commit_queue_entry *entry)
4733 {
4734 	const struct got_error *err;
4735 	const struct got_object_id_queue *parent_ids;
4736 	struct got_commit_object *selected_commit;
4737 	struct got_object_qid *pid;
4738 
4739 	free(s->id2);
4740 	s->id2 = got_object_id_dup(entry->id);
4741 	if (s->id2 == NULL)
4742 		return got_error_from_errno("got_object_id_dup");
4743 
4744 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4745 	if (err)
4746 		return err;
4747 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4748 	free(s->id1);
4749 	pid = STAILQ_FIRST(parent_ids);
4750 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4751 	got_object_commit_close(selected_commit);
4752 	return NULL;
4753 }
4754 
4755 static const struct got_error *
4756 reset_diff_view(struct tog_view *view)
4757 {
4758 	struct tog_diff_view_state *s = &view->state.diff;
4759 
4760 	view->count = 0;
4761 	wclear(view->window);
4762 	s->first_displayed_line = 1;
4763 	s->last_displayed_line = view->nlines;
4764 	s->matched_line = 0;
4765 	diff_view_indicate_progress(view);
4766 	return create_diff(s);
4767 }
4768 
4769 static void
4770 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4771 {
4772 	int start, i;
4773 
4774 	i = start = s->first_displayed_line - 1;
4775 
4776 	while (s->lines[i].type != type) {
4777 		if (i == 0)
4778 			i = s->nlines - 1;
4779 		if (--i == start)
4780 			return; /* do nothing, requested type not in file */
4781 	}
4782 
4783 	s->selected_line = 1;
4784 	s->first_displayed_line = i;
4785 }
4786 
4787 static void
4788 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4789 {
4790 	int start, i;
4791 
4792 	i = start = s->first_displayed_line + 1;
4793 
4794 	while (s->lines[i].type != type) {
4795 		if (i == s->nlines - 1)
4796 			i = 0;
4797 		if (++i == start)
4798 			return; /* do nothing, requested type not in file */
4799 	}
4800 
4801 	s->selected_line = 1;
4802 	s->first_displayed_line = i;
4803 }
4804 
4805 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4806     int, int, int);
4807 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4808     int, int);
4809 
4810 static const struct got_error *
4811 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4812 {
4813 	const struct got_error *err = NULL;
4814 	struct tog_diff_view_state *s = &view->state.diff;
4815 	struct tog_log_view_state *ls;
4816 	struct commit_queue_entry *old_selected_entry;
4817 	char *line = NULL;
4818 	size_t linesize = 0;
4819 	ssize_t linelen;
4820 	int i, nscroll = view->nlines - 1, up = 0;
4821 
4822 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
4823 
4824 	switch (ch) {
4825 	case '0':
4826 		view->x = 0;
4827 		break;
4828 	case '$':
4829 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4830 		view->count = 0;
4831 		break;
4832 	case KEY_RIGHT:
4833 	case 'l':
4834 		if (view->x + view->ncols / 3 < view->maxx)
4835 			view->x += 2;  /* move two columns right */
4836 		else
4837 			view->count = 0;
4838 		break;
4839 	case KEY_LEFT:
4840 	case 'h':
4841 		view->x -= MIN(view->x, 2);  /* move two columns back */
4842 		if (view->x <= 0)
4843 			view->count = 0;
4844 		break;
4845 	case 'a':
4846 	case 'w':
4847 		if (ch == 'a')
4848 			s->force_text_diff = !s->force_text_diff;
4849 		if (ch == 'w')
4850 			s->ignore_whitespace = !s->ignore_whitespace;
4851 		err = reset_diff_view(view);
4852 		break;
4853 	case 'g':
4854 	case KEY_HOME:
4855 		s->first_displayed_line = 1;
4856 		view->count = 0;
4857 		break;
4858 	case 'G':
4859 	case KEY_END:
4860 		view->count = 0;
4861 		if (s->eof)
4862 			break;
4863 
4864 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4865 		s->eof = 1;
4866 		break;
4867 	case 'k':
4868 	case KEY_UP:
4869 	case CTRL('p'):
4870 		if (s->first_displayed_line > 1)
4871 			s->first_displayed_line--;
4872 		else
4873 			view->count = 0;
4874 		break;
4875 	case CTRL('u'):
4876 	case 'u':
4877 		nscroll /= 2;
4878 		/* FALL THROUGH */
4879 	case KEY_PPAGE:
4880 	case CTRL('b'):
4881 	case 'b':
4882 		if (s->first_displayed_line == 1) {
4883 			view->count = 0;
4884 			break;
4885 		}
4886 		i = 0;
4887 		while (i++ < nscroll && s->first_displayed_line > 1)
4888 			s->first_displayed_line--;
4889 		break;
4890 	case 'j':
4891 	case KEY_DOWN:
4892 	case CTRL('n'):
4893 		if (!s->eof)
4894 			s->first_displayed_line++;
4895 		else
4896 			view->count = 0;
4897 		break;
4898 	case CTRL('d'):
4899 	case 'd':
4900 		nscroll /= 2;
4901 		/* FALL THROUGH */
4902 	case KEY_NPAGE:
4903 	case CTRL('f'):
4904 	case 'f':
4905 	case ' ':
4906 		if (s->eof) {
4907 			view->count = 0;
4908 			break;
4909 		}
4910 		i = 0;
4911 		while (!s->eof && i++ < nscroll) {
4912 			linelen = getline(&line, &linesize, s->f);
4913 			s->first_displayed_line++;
4914 			if (linelen == -1) {
4915 				if (feof(s->f)) {
4916 					s->eof = 1;
4917 				} else
4918 					err = got_ferror(s->f, GOT_ERR_IO);
4919 				break;
4920 			}
4921 		}
4922 		free(line);
4923 		break;
4924 	case '(':
4925 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
4926 		break;
4927 	case ')':
4928 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
4929 		break;
4930 	case '{':
4931 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
4932 		break;
4933 	case '}':
4934 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
4935 		break;
4936 	case '[':
4937 		if (s->diff_context > 0) {
4938 			s->diff_context--;
4939 			s->matched_line = 0;
4940 			diff_view_indicate_progress(view);
4941 			err = create_diff(s);
4942 			if (s->first_displayed_line + view->nlines - 1 >
4943 			    s->nlines) {
4944 				s->first_displayed_line = 1;
4945 				s->last_displayed_line = view->nlines;
4946 			}
4947 		} else
4948 			view->count = 0;
4949 		break;
4950 	case ']':
4951 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4952 			s->diff_context++;
4953 			s->matched_line = 0;
4954 			diff_view_indicate_progress(view);
4955 			err = create_diff(s);
4956 		} else
4957 			view->count = 0;
4958 		break;
4959 	case '<':
4960 	case ',':
4961 	case 'K':
4962 		up = 1;
4963 		/* FALL THROUGH */
4964 	case '>':
4965 	case '.':
4966 	case 'J':
4967 		if (s->parent_view == NULL) {
4968 			view->count = 0;
4969 			break;
4970 		}
4971 		s->parent_view->count = view->count;
4972 
4973 		if (s->parent_view->type == TOG_VIEW_LOG) {
4974 			ls = &s->parent_view->state.log;
4975 			old_selected_entry = ls->selected_entry;
4976 
4977 			err = input_log_view(NULL, s->parent_view,
4978 			    up ? KEY_UP : KEY_DOWN);
4979 			if (err)
4980 				break;
4981 			view->count = s->parent_view->count;
4982 
4983 			if (old_selected_entry == ls->selected_entry)
4984 				break;
4985 
4986 			err = set_selected_commit(s, ls->selected_entry);
4987 			if (err)
4988 				break;
4989 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4990 			struct tog_blame_view_state *bs;
4991 			struct got_object_id *id, *prev_id;
4992 
4993 			bs = &s->parent_view->state.blame;
4994 			prev_id = get_annotation_for_line(bs->blame.lines,
4995 			    bs->blame.nlines, bs->last_diffed_line);
4996 
4997 			err = input_blame_view(&view, s->parent_view,
4998 			    up ? KEY_UP : KEY_DOWN);
4999 			if (err)
5000 				break;
5001 			view->count = s->parent_view->count;
5002 
5003 			if (prev_id == NULL)
5004 				break;
5005 			id = get_selected_commit_id(bs->blame.lines,
5006 			    bs->blame.nlines, bs->first_displayed_line,
5007 			    bs->selected_line);
5008 			if (id == NULL)
5009 				break;
5010 
5011 			if (!got_object_id_cmp(prev_id, id))
5012 				break;
5013 
5014 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5015 			if (err)
5016 				break;
5017 		}
5018 		s->first_displayed_line = 1;
5019 		s->last_displayed_line = view->nlines;
5020 		s->matched_line = 0;
5021 		view->x = 0;
5022 
5023 		diff_view_indicate_progress(view);
5024 		err = create_diff(s);
5025 		break;
5026 	default:
5027 		view->count = 0;
5028 		break;
5029 	}
5030 
5031 	return err;
5032 }
5033 
5034 static const struct got_error *
5035 cmd_diff(int argc, char *argv[])
5036 {
5037 	const struct got_error *error = NULL;
5038 	struct got_repository *repo = NULL;
5039 	struct got_worktree *worktree = NULL;
5040 	struct got_object_id *id1 = NULL, *id2 = NULL;
5041 	char *repo_path = NULL, *cwd = NULL;
5042 	char *id_str1 = NULL, *id_str2 = NULL;
5043 	char *label1 = NULL, *label2 = NULL;
5044 	int diff_context = 3, ignore_whitespace = 0;
5045 	int ch, force_text_diff = 0;
5046 	const char *errstr;
5047 	struct tog_view *view;
5048 	int *pack_fds = NULL;
5049 
5050 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5051 		switch (ch) {
5052 		case 'a':
5053 			force_text_diff = 1;
5054 			break;
5055 		case 'C':
5056 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5057 			    &errstr);
5058 			if (errstr != NULL)
5059 				errx(1, "number of context lines is %s: %s",
5060 				    errstr, errstr);
5061 			break;
5062 		case 'r':
5063 			repo_path = realpath(optarg, NULL);
5064 			if (repo_path == NULL)
5065 				return got_error_from_errno2("realpath",
5066 				    optarg);
5067 			got_path_strip_trailing_slashes(repo_path);
5068 			break;
5069 		case 'w':
5070 			ignore_whitespace = 1;
5071 			break;
5072 		default:
5073 			usage_diff();
5074 			/* NOTREACHED */
5075 		}
5076 	}
5077 
5078 	argc -= optind;
5079 	argv += optind;
5080 
5081 	if (argc == 0) {
5082 		usage_diff(); /* TODO show local worktree changes */
5083 	} else if (argc == 2) {
5084 		id_str1 = argv[0];
5085 		id_str2 = argv[1];
5086 	} else
5087 		usage_diff();
5088 
5089 	error = got_repo_pack_fds_open(&pack_fds);
5090 	if (error)
5091 		goto done;
5092 
5093 	if (repo_path == NULL) {
5094 		cwd = getcwd(NULL, 0);
5095 		if (cwd == NULL)
5096 			return got_error_from_errno("getcwd");
5097 		error = got_worktree_open(&worktree, cwd);
5098 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5099 			goto done;
5100 		if (worktree)
5101 			repo_path =
5102 			    strdup(got_worktree_get_repo_path(worktree));
5103 		else
5104 			repo_path = strdup(cwd);
5105 		if (repo_path == NULL) {
5106 			error = got_error_from_errno("strdup");
5107 			goto done;
5108 		}
5109 	}
5110 
5111 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5112 	if (error)
5113 		goto done;
5114 
5115 	init_curses();
5116 
5117 	error = apply_unveil(got_repo_get_path(repo), NULL);
5118 	if (error)
5119 		goto done;
5120 
5121 	error = tog_load_refs(repo, 0);
5122 	if (error)
5123 		goto done;
5124 
5125 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5126 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5127 	if (error)
5128 		goto done;
5129 
5130 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5131 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5132 	if (error)
5133 		goto done;
5134 
5135 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5136 	if (view == NULL) {
5137 		error = got_error_from_errno("view_open");
5138 		goto done;
5139 	}
5140 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5141 	    ignore_whitespace, force_text_diff, NULL,  repo);
5142 	if (error)
5143 		goto done;
5144 	error = view_loop(view);
5145 done:
5146 	free(label1);
5147 	free(label2);
5148 	free(repo_path);
5149 	free(cwd);
5150 	if (repo) {
5151 		const struct got_error *close_err = got_repo_close(repo);
5152 		if (error == NULL)
5153 			error = close_err;
5154 	}
5155 	if (worktree)
5156 		got_worktree_close(worktree);
5157 	if (pack_fds) {
5158 		const struct got_error *pack_err =
5159 		    got_repo_pack_fds_close(pack_fds);
5160 		if (error == NULL)
5161 			error = pack_err;
5162 	}
5163 	tog_free_refs();
5164 	return error;
5165 }
5166 
5167 __dead static void
5168 usage_blame(void)
5169 {
5170 	endwin();
5171 	fprintf(stderr,
5172 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5173 	    getprogname());
5174 	exit(1);
5175 }
5176 
5177 struct tog_blame_line {
5178 	int annotated;
5179 	struct got_object_id *id;
5180 };
5181 
5182 static const struct got_error *
5183 draw_blame(struct tog_view *view)
5184 {
5185 	struct tog_blame_view_state *s = &view->state.blame;
5186 	struct tog_blame *blame = &s->blame;
5187 	regmatch_t *regmatch = &view->regmatch;
5188 	const struct got_error *err;
5189 	int lineno = 0, nprinted = 0;
5190 	char *line = NULL;
5191 	size_t linesize = 0;
5192 	ssize_t linelen;
5193 	wchar_t *wline;
5194 	int width;
5195 	struct tog_blame_line *blame_line;
5196 	struct got_object_id *prev_id = NULL;
5197 	char *id_str;
5198 	struct tog_color *tc;
5199 
5200 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5201 	if (err)
5202 		return err;
5203 
5204 	rewind(blame->f);
5205 	werase(view->window);
5206 
5207 	if (asprintf(&line, "commit %s", id_str) == -1) {
5208 		err = got_error_from_errno("asprintf");
5209 		free(id_str);
5210 		return err;
5211 	}
5212 
5213 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5214 	free(line);
5215 	line = NULL;
5216 	if (err)
5217 		return err;
5218 	if (view_needs_focus_indication(view))
5219 		wstandout(view->window);
5220 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5221 	if (tc)
5222 		wattr_on(view->window,
5223 		    COLOR_PAIR(tc->colorpair), NULL);
5224 	waddwstr(view->window, wline);
5225 	if (tc)
5226 		wattr_off(view->window,
5227 		    COLOR_PAIR(tc->colorpair), NULL);
5228 	if (view_needs_focus_indication(view))
5229 		wstandend(view->window);
5230 	free(wline);
5231 	wline = NULL;
5232 	if (width < view->ncols - 1)
5233 		waddch(view->window, '\n');
5234 
5235 	if (view->gline > blame->nlines)
5236 		view->gline = blame->nlines;
5237 
5238 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5239 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5240 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5241 		free(id_str);
5242 		return got_error_from_errno("asprintf");
5243 	}
5244 	free(id_str);
5245 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5246 	free(line);
5247 	line = NULL;
5248 	if (err)
5249 		return err;
5250 	waddwstr(view->window, wline);
5251 	free(wline);
5252 	wline = NULL;
5253 	if (width < view->ncols - 1)
5254 		waddch(view->window, '\n');
5255 
5256 	s->eof = 0;
5257 	view->maxx = 0;
5258 	while (nprinted < view->nlines - 2) {
5259 		linelen = getline(&line, &linesize, blame->f);
5260 		if (linelen == -1) {
5261 			if (feof(blame->f)) {
5262 				s->eof = 1;
5263 				break;
5264 			}
5265 			free(line);
5266 			return got_ferror(blame->f, GOT_ERR_IO);
5267 		}
5268 		if (++lineno < s->first_displayed_line)
5269 			continue;
5270 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5271 			continue;
5272 
5273 		/* Set view->maxx based on full line length. */
5274 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5275 		if (err) {
5276 			free(line);
5277 			return err;
5278 		}
5279 		free(wline);
5280 		wline = NULL;
5281 		view->maxx = MAX(view->maxx, width);
5282 
5283 		if (nprinted == s->selected_line - 1)
5284 			wstandout(view->window);
5285 
5286 		if (blame->nlines > 0) {
5287 			blame_line = &blame->lines[lineno - 1];
5288 			if (blame_line->annotated && prev_id &&
5289 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5290 			    !(nprinted == s->selected_line - 1)) {
5291 				waddstr(view->window, "        ");
5292 			} else if (blame_line->annotated) {
5293 				char *id_str;
5294 				err = got_object_id_str(&id_str,
5295 				    blame_line->id);
5296 				if (err) {
5297 					free(line);
5298 					return err;
5299 				}
5300 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5301 				if (tc)
5302 					wattr_on(view->window,
5303 					    COLOR_PAIR(tc->colorpair), NULL);
5304 				wprintw(view->window, "%.8s", id_str);
5305 				if (tc)
5306 					wattr_off(view->window,
5307 					    COLOR_PAIR(tc->colorpair), NULL);
5308 				free(id_str);
5309 				prev_id = blame_line->id;
5310 			} else {
5311 				waddstr(view->window, "........");
5312 				prev_id = NULL;
5313 			}
5314 		} else {
5315 			waddstr(view->window, "........");
5316 			prev_id = NULL;
5317 		}
5318 
5319 		if (nprinted == s->selected_line - 1)
5320 			wstandend(view->window);
5321 		waddstr(view->window, " ");
5322 
5323 		if (view->ncols <= 9) {
5324 			width = 9;
5325 		} else if (s->first_displayed_line + nprinted ==
5326 		    s->matched_line &&
5327 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5328 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5329 			    view->window, view->x, regmatch);
5330 			if (err) {
5331 				free(line);
5332 				return err;
5333 			}
5334 			width += 9;
5335 		} else {
5336 			int skip;
5337 			err = format_line(&wline, &width, &skip, line,
5338 			    view->x, view->ncols - 9, 9, 1);
5339 			if (err) {
5340 				free(line);
5341 				return err;
5342 			}
5343 			waddwstr(view->window, &wline[skip]);
5344 			width += 9;
5345 			free(wline);
5346 			wline = NULL;
5347 		}
5348 
5349 		if (width <= view->ncols - 1)
5350 			waddch(view->window, '\n');
5351 		if (++nprinted == 1)
5352 			s->first_displayed_line = lineno;
5353 	}
5354 	free(line);
5355 	s->last_displayed_line = lineno;
5356 
5357 	view_border(view);
5358 
5359 	return NULL;
5360 }
5361 
5362 static const struct got_error *
5363 blame_cb(void *arg, int nlines, int lineno,
5364     struct got_commit_object *commit, struct got_object_id *id)
5365 {
5366 	const struct got_error *err = NULL;
5367 	struct tog_blame_cb_args *a = arg;
5368 	struct tog_blame_line *line;
5369 	int errcode;
5370 
5371 	if (nlines != a->nlines ||
5372 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5373 		return got_error(GOT_ERR_RANGE);
5374 
5375 	errcode = pthread_mutex_lock(&tog_mutex);
5376 	if (errcode)
5377 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5378 
5379 	if (*a->quit) {	/* user has quit the blame view */
5380 		err = got_error(GOT_ERR_ITER_COMPLETED);
5381 		goto done;
5382 	}
5383 
5384 	if (lineno == -1)
5385 		goto done; /* no change in this commit */
5386 
5387 	line = &a->lines[lineno - 1];
5388 	if (line->annotated)
5389 		goto done;
5390 
5391 	line->id = got_object_id_dup(id);
5392 	if (line->id == NULL) {
5393 		err = got_error_from_errno("got_object_id_dup");
5394 		goto done;
5395 	}
5396 	line->annotated = 1;
5397 done:
5398 	errcode = pthread_mutex_unlock(&tog_mutex);
5399 	if (errcode)
5400 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5401 	return err;
5402 }
5403 
5404 static void *
5405 blame_thread(void *arg)
5406 {
5407 	const struct got_error *err, *close_err;
5408 	struct tog_blame_thread_args *ta = arg;
5409 	struct tog_blame_cb_args *a = ta->cb_args;
5410 	int errcode, fd1 = -1, fd2 = -1;
5411 	FILE *f1 = NULL, *f2 = NULL;
5412 
5413 	fd1 = got_opentempfd();
5414 	if (fd1 == -1)
5415 		return (void *)got_error_from_errno("got_opentempfd");
5416 
5417 	fd2 = got_opentempfd();
5418 	if (fd2 == -1) {
5419 		err = got_error_from_errno("got_opentempfd");
5420 		goto done;
5421 	}
5422 
5423 	f1 = got_opentemp();
5424 	if (f1 == NULL) {
5425 		err = (void *)got_error_from_errno("got_opentemp");
5426 		goto done;
5427 	}
5428 	f2 = got_opentemp();
5429 	if (f2 == NULL) {
5430 		err = (void *)got_error_from_errno("got_opentemp");
5431 		goto done;
5432 	}
5433 
5434 	err = block_signals_used_by_main_thread();
5435 	if (err)
5436 		goto done;
5437 
5438 	err = got_blame(ta->path, a->commit_id, ta->repo,
5439 	    tog_diff_algo, blame_cb, ta->cb_args,
5440 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5441 	if (err && err->code == GOT_ERR_CANCELLED)
5442 		err = NULL;
5443 
5444 	errcode = pthread_mutex_lock(&tog_mutex);
5445 	if (errcode) {
5446 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5447 		goto done;
5448 	}
5449 
5450 	close_err = got_repo_close(ta->repo);
5451 	if (err == NULL)
5452 		err = close_err;
5453 	ta->repo = NULL;
5454 	*ta->complete = 1;
5455 
5456 	errcode = pthread_mutex_unlock(&tog_mutex);
5457 	if (errcode && err == NULL)
5458 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5459 
5460 done:
5461 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5462 		err = got_error_from_errno("close");
5463 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5464 		err = got_error_from_errno("close");
5465 	if (f1 && fclose(f1) == EOF && err == NULL)
5466 		err = got_error_from_errno("fclose");
5467 	if (f2 && fclose(f2) == EOF && err == NULL)
5468 		err = got_error_from_errno("fclose");
5469 
5470 	return (void *)err;
5471 }
5472 
5473 static struct got_object_id *
5474 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5475     int first_displayed_line, int selected_line)
5476 {
5477 	struct tog_blame_line *line;
5478 
5479 	if (nlines <= 0)
5480 		return NULL;
5481 
5482 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5483 	if (!line->annotated)
5484 		return NULL;
5485 
5486 	return line->id;
5487 }
5488 
5489 static struct got_object_id *
5490 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5491     int lineno)
5492 {
5493 	struct tog_blame_line *line;
5494 
5495 	if (nlines <= 0 || lineno >= nlines)
5496 		return NULL;
5497 
5498 	line = &lines[lineno - 1];
5499 	if (!line->annotated)
5500 		return NULL;
5501 
5502 	return line->id;
5503 }
5504 
5505 static const struct got_error *
5506 stop_blame(struct tog_blame *blame)
5507 {
5508 	const struct got_error *err = NULL;
5509 	int i;
5510 
5511 	if (blame->thread) {
5512 		int errcode;
5513 		errcode = pthread_mutex_unlock(&tog_mutex);
5514 		if (errcode)
5515 			return got_error_set_errno(errcode,
5516 			    "pthread_mutex_unlock");
5517 		errcode = pthread_join(blame->thread, (void **)&err);
5518 		if (errcode)
5519 			return got_error_set_errno(errcode, "pthread_join");
5520 		errcode = pthread_mutex_lock(&tog_mutex);
5521 		if (errcode)
5522 			return got_error_set_errno(errcode,
5523 			    "pthread_mutex_lock");
5524 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5525 			err = NULL;
5526 		blame->thread = 0; //NULL;
5527 	}
5528 	if (blame->thread_args.repo) {
5529 		const struct got_error *close_err;
5530 		close_err = got_repo_close(blame->thread_args.repo);
5531 		if (err == NULL)
5532 			err = close_err;
5533 		blame->thread_args.repo = NULL;
5534 	}
5535 	if (blame->f) {
5536 		if (fclose(blame->f) == EOF && err == NULL)
5537 			err = got_error_from_errno("fclose");
5538 		blame->f = NULL;
5539 	}
5540 	if (blame->lines) {
5541 		for (i = 0; i < blame->nlines; i++)
5542 			free(blame->lines[i].id);
5543 		free(blame->lines);
5544 		blame->lines = NULL;
5545 	}
5546 	free(blame->cb_args.commit_id);
5547 	blame->cb_args.commit_id = NULL;
5548 	if (blame->pack_fds) {
5549 		const struct got_error *pack_err =
5550 		    got_repo_pack_fds_close(blame->pack_fds);
5551 		if (err == NULL)
5552 			err = pack_err;
5553 		blame->pack_fds = NULL;
5554 	}
5555 	return err;
5556 }
5557 
5558 static const struct got_error *
5559 cancel_blame_view(void *arg)
5560 {
5561 	const struct got_error *err = NULL;
5562 	int *done = arg;
5563 	int errcode;
5564 
5565 	errcode = pthread_mutex_lock(&tog_mutex);
5566 	if (errcode)
5567 		return got_error_set_errno(errcode,
5568 		    "pthread_mutex_unlock");
5569 
5570 	if (*done)
5571 		err = got_error(GOT_ERR_CANCELLED);
5572 
5573 	errcode = pthread_mutex_unlock(&tog_mutex);
5574 	if (errcode)
5575 		return got_error_set_errno(errcode,
5576 		    "pthread_mutex_lock");
5577 
5578 	return err;
5579 }
5580 
5581 static const struct got_error *
5582 run_blame(struct tog_view *view)
5583 {
5584 	struct tog_blame_view_state *s = &view->state.blame;
5585 	struct tog_blame *blame = &s->blame;
5586 	const struct got_error *err = NULL;
5587 	struct got_commit_object *commit = NULL;
5588 	struct got_blob_object *blob = NULL;
5589 	struct got_repository *thread_repo = NULL;
5590 	struct got_object_id *obj_id = NULL;
5591 	int obj_type, fd = -1;
5592 	int *pack_fds = NULL;
5593 
5594 	err = got_object_open_as_commit(&commit, s->repo,
5595 	    &s->blamed_commit->id);
5596 	if (err)
5597 		return err;
5598 
5599 	fd = got_opentempfd();
5600 	if (fd == -1) {
5601 		err = got_error_from_errno("got_opentempfd");
5602 		goto done;
5603 	}
5604 
5605 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5606 	if (err)
5607 		goto done;
5608 
5609 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5610 	if (err)
5611 		goto done;
5612 
5613 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5614 		err = got_error(GOT_ERR_OBJ_TYPE);
5615 		goto done;
5616 	}
5617 
5618 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5619 	if (err)
5620 		goto done;
5621 	blame->f = got_opentemp();
5622 	if (blame->f == NULL) {
5623 		err = got_error_from_errno("got_opentemp");
5624 		goto done;
5625 	}
5626 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5627 	    &blame->line_offsets, blame->f, blob);
5628 	if (err)
5629 		goto done;
5630 	if (blame->nlines == 0) {
5631 		s->blame_complete = 1;
5632 		goto done;
5633 	}
5634 
5635 	/* Don't include \n at EOF in the blame line count. */
5636 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5637 		blame->nlines--;
5638 
5639 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5640 	if (blame->lines == NULL) {
5641 		err = got_error_from_errno("calloc");
5642 		goto done;
5643 	}
5644 
5645 	err = got_repo_pack_fds_open(&pack_fds);
5646 	if (err)
5647 		goto done;
5648 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5649 	    pack_fds);
5650 	if (err)
5651 		goto done;
5652 
5653 	blame->pack_fds = pack_fds;
5654 	blame->cb_args.view = view;
5655 	blame->cb_args.lines = blame->lines;
5656 	blame->cb_args.nlines = blame->nlines;
5657 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5658 	if (blame->cb_args.commit_id == NULL) {
5659 		err = got_error_from_errno("got_object_id_dup");
5660 		goto done;
5661 	}
5662 	blame->cb_args.quit = &s->done;
5663 
5664 	blame->thread_args.path = s->path;
5665 	blame->thread_args.repo = thread_repo;
5666 	blame->thread_args.cb_args = &blame->cb_args;
5667 	blame->thread_args.complete = &s->blame_complete;
5668 	blame->thread_args.cancel_cb = cancel_blame_view;
5669 	blame->thread_args.cancel_arg = &s->done;
5670 	s->blame_complete = 0;
5671 
5672 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5673 		s->first_displayed_line = 1;
5674 		s->last_displayed_line = view->nlines;
5675 		s->selected_line = 1;
5676 	}
5677 	s->matched_line = 0;
5678 
5679 done:
5680 	if (commit)
5681 		got_object_commit_close(commit);
5682 	if (fd != -1 && close(fd) == -1 && err == NULL)
5683 		err = got_error_from_errno("close");
5684 	if (blob)
5685 		got_object_blob_close(blob);
5686 	free(obj_id);
5687 	if (err)
5688 		stop_blame(blame);
5689 	return err;
5690 }
5691 
5692 static const struct got_error *
5693 open_blame_view(struct tog_view *view, char *path,
5694     struct got_object_id *commit_id, struct got_repository *repo)
5695 {
5696 	const struct got_error *err = NULL;
5697 	struct tog_blame_view_state *s = &view->state.blame;
5698 
5699 	STAILQ_INIT(&s->blamed_commits);
5700 
5701 	s->path = strdup(path);
5702 	if (s->path == NULL)
5703 		return got_error_from_errno("strdup");
5704 
5705 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5706 	if (err) {
5707 		free(s->path);
5708 		return err;
5709 	}
5710 
5711 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5712 	s->first_displayed_line = 1;
5713 	s->last_displayed_line = view->nlines;
5714 	s->selected_line = 1;
5715 	s->blame_complete = 0;
5716 	s->repo = repo;
5717 	s->commit_id = commit_id;
5718 	memset(&s->blame, 0, sizeof(s->blame));
5719 
5720 	STAILQ_INIT(&s->colors);
5721 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5722 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5723 		    get_color_value("TOG_COLOR_COMMIT"));
5724 		if (err)
5725 			return err;
5726 	}
5727 
5728 	view->show = show_blame_view;
5729 	view->input = input_blame_view;
5730 	view->reset = reset_blame_view;
5731 	view->close = close_blame_view;
5732 	view->search_start = search_start_blame_view;
5733 	view->search_next = search_next_blame_view;
5734 
5735 	return run_blame(view);
5736 }
5737 
5738 static const struct got_error *
5739 close_blame_view(struct tog_view *view)
5740 {
5741 	const struct got_error *err = NULL;
5742 	struct tog_blame_view_state *s = &view->state.blame;
5743 
5744 	if (s->blame.thread)
5745 		err = stop_blame(&s->blame);
5746 
5747 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5748 		struct got_object_qid *blamed_commit;
5749 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5750 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5751 		got_object_qid_free(blamed_commit);
5752 	}
5753 
5754 	free(s->path);
5755 	free_colors(&s->colors);
5756 	return err;
5757 }
5758 
5759 static const struct got_error *
5760 search_start_blame_view(struct tog_view *view)
5761 {
5762 	struct tog_blame_view_state *s = &view->state.blame;
5763 
5764 	s->matched_line = 0;
5765 	return NULL;
5766 }
5767 
5768 static const struct got_error *
5769 search_next_blame_view(struct tog_view *view)
5770 {
5771 	struct tog_blame_view_state *s = &view->state.blame;
5772 	const struct got_error *err = NULL;
5773 	int lineno;
5774 	char *line = NULL;
5775 	size_t linesize = 0;
5776 	ssize_t linelen;
5777 
5778 	if (!view->searching) {
5779 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5780 		return NULL;
5781 	}
5782 
5783 	if (s->matched_line) {
5784 		if (view->searching == TOG_SEARCH_FORWARD)
5785 			lineno = s->matched_line + 1;
5786 		else
5787 			lineno = s->matched_line - 1;
5788 	} else
5789 		lineno = s->first_displayed_line - 1 + s->selected_line;
5790 
5791 	while (1) {
5792 		off_t offset;
5793 
5794 		if (lineno <= 0 || lineno > s->blame.nlines) {
5795 			if (s->matched_line == 0) {
5796 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5797 				break;
5798 			}
5799 
5800 			if (view->searching == TOG_SEARCH_FORWARD)
5801 				lineno = 1;
5802 			else
5803 				lineno = s->blame.nlines;
5804 		}
5805 
5806 		offset = s->blame.line_offsets[lineno - 1];
5807 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5808 			free(line);
5809 			return got_error_from_errno("fseeko");
5810 		}
5811 		linelen = getline(&line, &linesize, s->blame.f);
5812 		if (linelen != -1) {
5813 			char *exstr;
5814 			err = expand_tab(&exstr, line);
5815 			if (err)
5816 				break;
5817 			if (match_line(exstr, &view->regex, 1,
5818 			    &view->regmatch)) {
5819 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5820 				s->matched_line = lineno;
5821 				free(exstr);
5822 				break;
5823 			}
5824 			free(exstr);
5825 		}
5826 		if (view->searching == TOG_SEARCH_FORWARD)
5827 			lineno++;
5828 		else
5829 			lineno--;
5830 	}
5831 	free(line);
5832 
5833 	if (s->matched_line) {
5834 		s->first_displayed_line = s->matched_line;
5835 		s->selected_line = 1;
5836 	}
5837 
5838 	return err;
5839 }
5840 
5841 static const struct got_error *
5842 show_blame_view(struct tog_view *view)
5843 {
5844 	const struct got_error *err = NULL;
5845 	struct tog_blame_view_state *s = &view->state.blame;
5846 	int errcode;
5847 
5848 	if (s->blame.thread == 0 && !s->blame_complete) {
5849 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5850 		    &s->blame.thread_args);
5851 		if (errcode)
5852 			return got_error_set_errno(errcode, "pthread_create");
5853 
5854 		halfdelay(1); /* fast refresh while annotating  */
5855 	}
5856 
5857 	if (s->blame_complete)
5858 		halfdelay(10); /* disable fast refresh */
5859 
5860 	err = draw_blame(view);
5861 
5862 	view_border(view);
5863 	return err;
5864 }
5865 
5866 static const struct got_error *
5867 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5868     struct got_repository *repo, struct got_object_id *id)
5869 {
5870 	struct tog_view		*log_view;
5871 	const struct got_error	*err = NULL;
5872 
5873 	*new_view = NULL;
5874 
5875 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5876 	if (log_view == NULL)
5877 		return got_error_from_errno("view_open");
5878 
5879 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5880 	if (err)
5881 		view_close(log_view);
5882 	else
5883 		*new_view = log_view;
5884 
5885 	return err;
5886 }
5887 
5888 static const struct got_error *
5889 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5890 {
5891 	const struct got_error *err = NULL, *thread_err = NULL;
5892 	struct tog_view *diff_view;
5893 	struct tog_blame_view_state *s = &view->state.blame;
5894 	int eos, nscroll, begin_y = 0, begin_x = 0;
5895 
5896 	eos = nscroll = view->nlines - 2;
5897 	if (view_is_hsplit_top(view))
5898 		--eos;  /* border */
5899 
5900 	switch (ch) {
5901 	case '0':
5902 		view->x = 0;
5903 		break;
5904 	case '$':
5905 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5906 		view->count = 0;
5907 		break;
5908 	case KEY_RIGHT:
5909 	case 'l':
5910 		if (view->x + view->ncols / 3 < view->maxx)
5911 			view->x += 2;  /* move two columns right */
5912 		else
5913 			view->count = 0;
5914 		break;
5915 	case KEY_LEFT:
5916 	case 'h':
5917 		view->x -= MIN(view->x, 2);  /* move two columns back */
5918 		if (view->x <= 0)
5919 			view->count = 0;
5920 		break;
5921 	case 'q':
5922 		s->done = 1;
5923 		break;
5924 	case 'g':
5925 	case KEY_HOME:
5926 		s->selected_line = 1;
5927 		s->first_displayed_line = 1;
5928 		view->count = 0;
5929 		break;
5930 	case 'G':
5931 	case KEY_END:
5932 		if (s->blame.nlines < eos) {
5933 			s->selected_line = s->blame.nlines;
5934 			s->first_displayed_line = 1;
5935 		} else {
5936 			s->selected_line = eos;
5937 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5938 		}
5939 		view->count = 0;
5940 		break;
5941 	case 'k':
5942 	case KEY_UP:
5943 	case CTRL('p'):
5944 		if (s->selected_line > 1)
5945 			s->selected_line--;
5946 		else if (s->selected_line == 1 &&
5947 		    s->first_displayed_line > 1)
5948 			s->first_displayed_line--;
5949 		else
5950 			view->count = 0;
5951 		break;
5952 	case CTRL('u'):
5953 	case 'u':
5954 		nscroll /= 2;
5955 		/* FALL THROUGH */
5956 	case KEY_PPAGE:
5957 	case CTRL('b'):
5958 	case 'b':
5959 		if (s->first_displayed_line == 1) {
5960 			if (view->count > 1)
5961 				nscroll += nscroll;
5962 			s->selected_line = MAX(1, s->selected_line - nscroll);
5963 			view->count = 0;
5964 			break;
5965 		}
5966 		if (s->first_displayed_line > nscroll)
5967 			s->first_displayed_line -= nscroll;
5968 		else
5969 			s->first_displayed_line = 1;
5970 		break;
5971 	case 'j':
5972 	case KEY_DOWN:
5973 	case CTRL('n'):
5974 		if (s->selected_line < eos && s->first_displayed_line +
5975 		    s->selected_line <= s->blame.nlines)
5976 			s->selected_line++;
5977 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5978 			s->first_displayed_line++;
5979 		else
5980 			view->count = 0;
5981 		break;
5982 	case 'c':
5983 	case 'p': {
5984 		struct got_object_id *id = NULL;
5985 
5986 		view->count = 0;
5987 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5988 		    s->first_displayed_line, s->selected_line);
5989 		if (id == NULL)
5990 			break;
5991 		if (ch == 'p') {
5992 			struct got_commit_object *commit, *pcommit;
5993 			struct got_object_qid *pid;
5994 			struct got_object_id *blob_id = NULL;
5995 			int obj_type;
5996 			err = got_object_open_as_commit(&commit,
5997 			    s->repo, id);
5998 			if (err)
5999 				break;
6000 			pid = STAILQ_FIRST(
6001 			    got_object_commit_get_parent_ids(commit));
6002 			if (pid == NULL) {
6003 				got_object_commit_close(commit);
6004 				break;
6005 			}
6006 			/* Check if path history ends here. */
6007 			err = got_object_open_as_commit(&pcommit,
6008 			    s->repo, &pid->id);
6009 			if (err)
6010 				break;
6011 			err = got_object_id_by_path(&blob_id, s->repo,
6012 			    pcommit, s->path);
6013 			got_object_commit_close(pcommit);
6014 			if (err) {
6015 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6016 					err = NULL;
6017 				got_object_commit_close(commit);
6018 				break;
6019 			}
6020 			err = got_object_get_type(&obj_type, s->repo,
6021 			    blob_id);
6022 			free(blob_id);
6023 			/* Can't blame non-blob type objects. */
6024 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6025 				got_object_commit_close(commit);
6026 				break;
6027 			}
6028 			err = got_object_qid_alloc(&s->blamed_commit,
6029 			    &pid->id);
6030 			got_object_commit_close(commit);
6031 		} else {
6032 			if (got_object_id_cmp(id,
6033 			    &s->blamed_commit->id) == 0)
6034 				break;
6035 			err = got_object_qid_alloc(&s->blamed_commit,
6036 			    id);
6037 		}
6038 		if (err)
6039 			break;
6040 		s->done = 1;
6041 		thread_err = stop_blame(&s->blame);
6042 		s->done = 0;
6043 		if (thread_err)
6044 			break;
6045 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6046 		    s->blamed_commit, entry);
6047 		err = run_blame(view);
6048 		if (err)
6049 			break;
6050 		break;
6051 	}
6052 	case 'C': {
6053 		struct got_object_qid *first;
6054 
6055 		view->count = 0;
6056 		first = STAILQ_FIRST(&s->blamed_commits);
6057 		if (!got_object_id_cmp(&first->id, s->commit_id))
6058 			break;
6059 		s->done = 1;
6060 		thread_err = stop_blame(&s->blame);
6061 		s->done = 0;
6062 		if (thread_err)
6063 			break;
6064 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6065 		got_object_qid_free(s->blamed_commit);
6066 		s->blamed_commit =
6067 		    STAILQ_FIRST(&s->blamed_commits);
6068 		err = run_blame(view);
6069 		if (err)
6070 			break;
6071 		break;
6072 	}
6073 	case 'L':
6074 		view->count = 0;
6075 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6076 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6077 		if (s->id_to_log)
6078 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6079 		break;
6080 	case KEY_ENTER:
6081 	case '\r': {
6082 		struct got_object_id *id = NULL;
6083 		struct got_object_qid *pid;
6084 		struct got_commit_object *commit = NULL;
6085 
6086 		view->count = 0;
6087 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6088 		    s->first_displayed_line, s->selected_line);
6089 		if (id == NULL)
6090 			break;
6091 		err = got_object_open_as_commit(&commit, s->repo, id);
6092 		if (err)
6093 			break;
6094 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6095 		if (*new_view) {
6096 			/* traversed from diff view, release diff resources  */
6097 			err = close_diff_view(*new_view);
6098 			if (err)
6099 				break;
6100 			diff_view = *new_view;
6101 		} else {
6102 			if (view_is_parent_view(view))
6103 				view_get_split(view, &begin_y, &begin_x);
6104 
6105 			diff_view = view_open(0, 0, begin_y, begin_x,
6106 			    TOG_VIEW_DIFF);
6107 			if (diff_view == NULL) {
6108 				got_object_commit_close(commit);
6109 				err = got_error_from_errno("view_open");
6110 				break;
6111 			}
6112 		}
6113 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6114 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6115 		got_object_commit_close(commit);
6116 		if (err) {
6117 			view_close(diff_view);
6118 			break;
6119 		}
6120 		s->last_diffed_line = s->first_displayed_line - 1 +
6121 		    s->selected_line;
6122 		if (*new_view)
6123 			break;	/* still open from active diff view */
6124 		if (view_is_parent_view(view) &&
6125 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6126 			err = view_init_hsplit(view, begin_y);
6127 			if (err)
6128 				break;
6129 		}
6130 
6131 		view->focussed = 0;
6132 		diff_view->focussed = 1;
6133 		diff_view->mode = view->mode;
6134 		diff_view->nlines = view->lines - begin_y;
6135 		if (view_is_parent_view(view)) {
6136 			view_transfer_size(diff_view, view);
6137 			err = view_close_child(view);
6138 			if (err)
6139 				break;
6140 			err = view_set_child(view, diff_view);
6141 			if (err)
6142 				break;
6143 			view->focus_child = 1;
6144 		} else
6145 			*new_view = diff_view;
6146 		if (err)
6147 			break;
6148 		break;
6149 	}
6150 	case CTRL('d'):
6151 	case 'd':
6152 		nscroll /= 2;
6153 		/* FALL THROUGH */
6154 	case KEY_NPAGE:
6155 	case CTRL('f'):
6156 	case 'f':
6157 	case ' ':
6158 		if (s->last_displayed_line >= s->blame.nlines &&
6159 		    s->selected_line >= MIN(s->blame.nlines,
6160 		    view->nlines - 2)) {
6161 			view->count = 0;
6162 			break;
6163 		}
6164 		if (s->last_displayed_line >= s->blame.nlines &&
6165 		    s->selected_line < view->nlines - 2) {
6166 			s->selected_line +=
6167 			    MIN(nscroll, s->last_displayed_line -
6168 			    s->first_displayed_line - s->selected_line + 1);
6169 		}
6170 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6171 			s->first_displayed_line += nscroll;
6172 		else
6173 			s->first_displayed_line =
6174 			    s->blame.nlines - (view->nlines - 3);
6175 		break;
6176 	case KEY_RESIZE:
6177 		if (s->selected_line > view->nlines - 2) {
6178 			s->selected_line = MIN(s->blame.nlines,
6179 			    view->nlines - 2);
6180 		}
6181 		break;
6182 	default:
6183 		view->count = 0;
6184 		break;
6185 	}
6186 	return thread_err ? thread_err : err;
6187 }
6188 
6189 static const struct got_error *
6190 reset_blame_view(struct tog_view *view)
6191 {
6192 	const struct got_error *err;
6193 	struct tog_blame_view_state *s = &view->state.blame;
6194 
6195 	view->count = 0;
6196 	s->done = 1;
6197 	err = stop_blame(&s->blame);
6198 	s->done = 0;
6199 	if (err)
6200 		return err;
6201 	return run_blame(view);
6202 }
6203 
6204 static const struct got_error *
6205 cmd_blame(int argc, char *argv[])
6206 {
6207 	const struct got_error *error;
6208 	struct got_repository *repo = NULL;
6209 	struct got_worktree *worktree = NULL;
6210 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6211 	char *link_target = NULL;
6212 	struct got_object_id *commit_id = NULL;
6213 	struct got_commit_object *commit = NULL;
6214 	char *commit_id_str = NULL;
6215 	int ch;
6216 	struct tog_view *view;
6217 	int *pack_fds = NULL;
6218 
6219 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6220 		switch (ch) {
6221 		case 'c':
6222 			commit_id_str = optarg;
6223 			break;
6224 		case 'r':
6225 			repo_path = realpath(optarg, NULL);
6226 			if (repo_path == NULL)
6227 				return got_error_from_errno2("realpath",
6228 				    optarg);
6229 			break;
6230 		default:
6231 			usage_blame();
6232 			/* NOTREACHED */
6233 		}
6234 	}
6235 
6236 	argc -= optind;
6237 	argv += optind;
6238 
6239 	if (argc != 1)
6240 		usage_blame();
6241 
6242 	error = got_repo_pack_fds_open(&pack_fds);
6243 	if (error != NULL)
6244 		goto done;
6245 
6246 	if (repo_path == NULL) {
6247 		cwd = getcwd(NULL, 0);
6248 		if (cwd == NULL)
6249 			return got_error_from_errno("getcwd");
6250 		error = got_worktree_open(&worktree, cwd);
6251 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6252 			goto done;
6253 		if (worktree)
6254 			repo_path =
6255 			    strdup(got_worktree_get_repo_path(worktree));
6256 		else
6257 			repo_path = strdup(cwd);
6258 		if (repo_path == NULL) {
6259 			error = got_error_from_errno("strdup");
6260 			goto done;
6261 		}
6262 	}
6263 
6264 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6265 	if (error != NULL)
6266 		goto done;
6267 
6268 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6269 	    worktree);
6270 	if (error)
6271 		goto done;
6272 
6273 	init_curses();
6274 
6275 	error = apply_unveil(got_repo_get_path(repo), NULL);
6276 	if (error)
6277 		goto done;
6278 
6279 	error = tog_load_refs(repo, 0);
6280 	if (error)
6281 		goto done;
6282 
6283 	if (commit_id_str == NULL) {
6284 		struct got_reference *head_ref;
6285 		error = got_ref_open(&head_ref, repo, worktree ?
6286 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6287 		if (error != NULL)
6288 			goto done;
6289 		error = got_ref_resolve(&commit_id, repo, head_ref);
6290 		got_ref_close(head_ref);
6291 	} else {
6292 		error = got_repo_match_object_id(&commit_id, NULL,
6293 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6294 	}
6295 	if (error != NULL)
6296 		goto done;
6297 
6298 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6299 	if (view == NULL) {
6300 		error = got_error_from_errno("view_open");
6301 		goto done;
6302 	}
6303 
6304 	error = got_object_open_as_commit(&commit, repo, commit_id);
6305 	if (error)
6306 		goto done;
6307 
6308 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6309 	    commit, repo);
6310 	if (error)
6311 		goto done;
6312 
6313 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6314 	    commit_id, repo);
6315 	if (error)
6316 		goto done;
6317 	if (worktree) {
6318 		/* Release work tree lock. */
6319 		got_worktree_close(worktree);
6320 		worktree = NULL;
6321 	}
6322 	error = view_loop(view);
6323 done:
6324 	free(repo_path);
6325 	free(in_repo_path);
6326 	free(link_target);
6327 	free(cwd);
6328 	free(commit_id);
6329 	if (commit)
6330 		got_object_commit_close(commit);
6331 	if (worktree)
6332 		got_worktree_close(worktree);
6333 	if (repo) {
6334 		const struct got_error *close_err = got_repo_close(repo);
6335 		if (error == NULL)
6336 			error = close_err;
6337 	}
6338 	if (pack_fds) {
6339 		const struct got_error *pack_err =
6340 		    got_repo_pack_fds_close(pack_fds);
6341 		if (error == NULL)
6342 			error = pack_err;
6343 	}
6344 	tog_free_refs();
6345 	return error;
6346 }
6347 
6348 static const struct got_error *
6349 draw_tree_entries(struct tog_view *view, const char *parent_path)
6350 {
6351 	struct tog_tree_view_state *s = &view->state.tree;
6352 	const struct got_error *err = NULL;
6353 	struct got_tree_entry *te;
6354 	wchar_t *wline;
6355 	struct tog_color *tc;
6356 	int width, n, nentries, i = 1;
6357 	int limit = view->nlines;
6358 
6359 	s->ndisplayed = 0;
6360 	if (view_is_hsplit_top(view))
6361 		--limit;  /* border */
6362 
6363 	werase(view->window);
6364 
6365 	if (limit == 0)
6366 		return NULL;
6367 
6368 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6369 	    0, 0);
6370 	if (err)
6371 		return err;
6372 	if (view_needs_focus_indication(view))
6373 		wstandout(view->window);
6374 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6375 	if (tc)
6376 		wattr_on(view->window,
6377 		    COLOR_PAIR(tc->colorpair), NULL);
6378 	waddwstr(view->window, wline);
6379 	if (tc)
6380 		wattr_off(view->window,
6381 		    COLOR_PAIR(tc->colorpair), NULL);
6382 	if (view_needs_focus_indication(view))
6383 		wstandend(view->window);
6384 	free(wline);
6385 	wline = NULL;
6386 
6387 	i += s->selected;
6388 	if (s->first_displayed_entry) {
6389 		i += got_tree_entry_get_index(s->first_displayed_entry);
6390 		if (s->tree != s->root)
6391 			++i;  /* account for ".." entry */
6392 	}
6393 	nentries = got_object_tree_get_nentries(s->tree);
6394 	wprintw(view->window, " [%d/%d]", i,
6395 	    nentries + (s->tree == s->root ? 0 : 1));  /* ".." in !root tree */
6396 
6397 	if (width < view->ncols - 1)
6398 		waddch(view->window, '\n');
6399 	if (--limit <= 0)
6400 		return NULL;
6401 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6402 	    0, 0);
6403 	if (err)
6404 		return err;
6405 	waddwstr(view->window, wline);
6406 	free(wline);
6407 	wline = NULL;
6408 	if (width < view->ncols - 1)
6409 		waddch(view->window, '\n');
6410 	if (--limit <= 0)
6411 		return NULL;
6412 	waddch(view->window, '\n');
6413 	if (--limit <= 0)
6414 		return NULL;
6415 
6416 	if (s->first_displayed_entry == NULL) {
6417 		te = got_object_tree_get_first_entry(s->tree);
6418 		if (s->selected == 0) {
6419 			if (view->focussed)
6420 				wstandout(view->window);
6421 			s->selected_entry = NULL;
6422 		}
6423 		waddstr(view->window, "  ..\n");	/* parent directory */
6424 		if (s->selected == 0 && view->focussed)
6425 			wstandend(view->window);
6426 		s->ndisplayed++;
6427 		if (--limit <= 0)
6428 			return NULL;
6429 		n = 1;
6430 	} else {
6431 		n = 0;
6432 		te = s->first_displayed_entry;
6433 	}
6434 
6435 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6436 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6437 		const char *modestr = "";
6438 		mode_t mode;
6439 
6440 		te = got_object_tree_get_entry(s->tree, i);
6441 		mode = got_tree_entry_get_mode(te);
6442 
6443 		if (s->show_ids) {
6444 			err = got_object_id_str(&id_str,
6445 			    got_tree_entry_get_id(te));
6446 			if (err)
6447 				return got_error_from_errno(
6448 				    "got_object_id_str");
6449 		}
6450 		if (got_object_tree_entry_is_submodule(te))
6451 			modestr = "$";
6452 		else if (S_ISLNK(mode)) {
6453 			int i;
6454 
6455 			err = got_tree_entry_get_symlink_target(&link_target,
6456 			    te, s->repo);
6457 			if (err) {
6458 				free(id_str);
6459 				return err;
6460 			}
6461 			for (i = 0; i < strlen(link_target); i++) {
6462 				if (!isprint((unsigned char)link_target[i]))
6463 					link_target[i] = '?';
6464 			}
6465 			modestr = "@";
6466 		}
6467 		else if (S_ISDIR(mode))
6468 			modestr = "/";
6469 		else if (mode & S_IXUSR)
6470 			modestr = "*";
6471 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6472 		    got_tree_entry_get_name(te), modestr,
6473 		    link_target ? " -> ": "",
6474 		    link_target ? link_target : "") == -1) {
6475 			free(id_str);
6476 			free(link_target);
6477 			return got_error_from_errno("asprintf");
6478 		}
6479 		free(id_str);
6480 		free(link_target);
6481 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6482 		    0, 0);
6483 		if (err) {
6484 			free(line);
6485 			break;
6486 		}
6487 		if (n == s->selected) {
6488 			if (view->focussed)
6489 				wstandout(view->window);
6490 			s->selected_entry = te;
6491 		}
6492 		tc = match_color(&s->colors, line);
6493 		if (tc)
6494 			wattr_on(view->window,
6495 			    COLOR_PAIR(tc->colorpair), NULL);
6496 		waddwstr(view->window, wline);
6497 		if (tc)
6498 			wattr_off(view->window,
6499 			    COLOR_PAIR(tc->colorpair), NULL);
6500 		if (width < view->ncols - 1)
6501 			waddch(view->window, '\n');
6502 		if (n == s->selected && view->focussed)
6503 			wstandend(view->window);
6504 		free(line);
6505 		free(wline);
6506 		wline = NULL;
6507 		n++;
6508 		s->ndisplayed++;
6509 		s->last_displayed_entry = te;
6510 		if (--limit <= 0)
6511 			break;
6512 	}
6513 
6514 	return err;
6515 }
6516 
6517 static void
6518 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6519 {
6520 	struct got_tree_entry *te;
6521 	int isroot = s->tree == s->root;
6522 	int i = 0;
6523 
6524 	if (s->first_displayed_entry == NULL)
6525 		return;
6526 
6527 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6528 	while (i++ < maxscroll) {
6529 		if (te == NULL) {
6530 			if (!isroot)
6531 				s->first_displayed_entry = NULL;
6532 			break;
6533 		}
6534 		s->first_displayed_entry = te;
6535 		te = got_tree_entry_get_prev(s->tree, te);
6536 	}
6537 }
6538 
6539 static const struct got_error *
6540 tree_scroll_down(struct tog_view *view, int maxscroll)
6541 {
6542 	struct tog_tree_view_state *s = &view->state.tree;
6543 	struct got_tree_entry *next, *last;
6544 	int n = 0;
6545 
6546 	if (s->first_displayed_entry)
6547 		next = got_tree_entry_get_next(s->tree,
6548 		    s->first_displayed_entry);
6549 	else
6550 		next = got_object_tree_get_first_entry(s->tree);
6551 
6552 	last = s->last_displayed_entry;
6553 	while (next && n++ < maxscroll) {
6554 		if (last) {
6555 			s->last_displayed_entry = last;
6556 			last = got_tree_entry_get_next(s->tree, last);
6557 		}
6558 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6559 			s->first_displayed_entry = next;
6560 			next = got_tree_entry_get_next(s->tree, next);
6561 		}
6562 	}
6563 
6564 	return NULL;
6565 }
6566 
6567 static const struct got_error *
6568 tree_entry_path(char **path, struct tog_parent_trees *parents,
6569     struct got_tree_entry *te)
6570 {
6571 	const struct got_error *err = NULL;
6572 	struct tog_parent_tree *pt;
6573 	size_t len = 2; /* for leading slash and NUL */
6574 
6575 	TAILQ_FOREACH(pt, parents, entry)
6576 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6577 		    + 1 /* slash */;
6578 	if (te)
6579 		len += strlen(got_tree_entry_get_name(te));
6580 
6581 	*path = calloc(1, len);
6582 	if (path == NULL)
6583 		return got_error_from_errno("calloc");
6584 
6585 	(*path)[0] = '/';
6586 	pt = TAILQ_LAST(parents, tog_parent_trees);
6587 	while (pt) {
6588 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6589 		if (strlcat(*path, name, len) >= len) {
6590 			err = got_error(GOT_ERR_NO_SPACE);
6591 			goto done;
6592 		}
6593 		if (strlcat(*path, "/", len) >= len) {
6594 			err = got_error(GOT_ERR_NO_SPACE);
6595 			goto done;
6596 		}
6597 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6598 	}
6599 	if (te) {
6600 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6601 			err = got_error(GOT_ERR_NO_SPACE);
6602 			goto done;
6603 		}
6604 	}
6605 done:
6606 	if (err) {
6607 		free(*path);
6608 		*path = NULL;
6609 	}
6610 	return err;
6611 }
6612 
6613 static const struct got_error *
6614 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6615     struct got_tree_entry *te, struct tog_parent_trees *parents,
6616     struct got_object_id *commit_id, struct got_repository *repo)
6617 {
6618 	const struct got_error *err = NULL;
6619 	char *path;
6620 	struct tog_view *blame_view;
6621 
6622 	*new_view = NULL;
6623 
6624 	err = tree_entry_path(&path, parents, te);
6625 	if (err)
6626 		return err;
6627 
6628 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6629 	if (blame_view == NULL) {
6630 		err = got_error_from_errno("view_open");
6631 		goto done;
6632 	}
6633 
6634 	err = open_blame_view(blame_view, path, commit_id, repo);
6635 	if (err) {
6636 		if (err->code == GOT_ERR_CANCELLED)
6637 			err = NULL;
6638 		view_close(blame_view);
6639 	} else
6640 		*new_view = blame_view;
6641 done:
6642 	free(path);
6643 	return err;
6644 }
6645 
6646 static const struct got_error *
6647 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6648     struct tog_tree_view_state *s)
6649 {
6650 	struct tog_view *log_view;
6651 	const struct got_error *err = NULL;
6652 	char *path;
6653 
6654 	*new_view = NULL;
6655 
6656 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6657 	if (log_view == NULL)
6658 		return got_error_from_errno("view_open");
6659 
6660 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6661 	if (err)
6662 		return err;
6663 
6664 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6665 	    path, 0);
6666 	if (err)
6667 		view_close(log_view);
6668 	else
6669 		*new_view = log_view;
6670 	free(path);
6671 	return err;
6672 }
6673 
6674 static const struct got_error *
6675 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6676     const char *head_ref_name, struct got_repository *repo)
6677 {
6678 	const struct got_error *err = NULL;
6679 	char *commit_id_str = NULL;
6680 	struct tog_tree_view_state *s = &view->state.tree;
6681 	struct got_commit_object *commit = NULL;
6682 
6683 	TAILQ_INIT(&s->parents);
6684 	STAILQ_INIT(&s->colors);
6685 
6686 	s->commit_id = got_object_id_dup(commit_id);
6687 	if (s->commit_id == NULL)
6688 		return got_error_from_errno("got_object_id_dup");
6689 
6690 	err = got_object_open_as_commit(&commit, repo, commit_id);
6691 	if (err)
6692 		goto done;
6693 
6694 	/*
6695 	 * The root is opened here and will be closed when the view is closed.
6696 	 * Any visited subtrees and their path-wise parents are opened and
6697 	 * closed on demand.
6698 	 */
6699 	err = got_object_open_as_tree(&s->root, repo,
6700 	    got_object_commit_get_tree_id(commit));
6701 	if (err)
6702 		goto done;
6703 	s->tree = s->root;
6704 
6705 	err = got_object_id_str(&commit_id_str, commit_id);
6706 	if (err != NULL)
6707 		goto done;
6708 
6709 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6710 		err = got_error_from_errno("asprintf");
6711 		goto done;
6712 	}
6713 
6714 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6715 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6716 	if (head_ref_name) {
6717 		s->head_ref_name = strdup(head_ref_name);
6718 		if (s->head_ref_name == NULL) {
6719 			err = got_error_from_errno("strdup");
6720 			goto done;
6721 		}
6722 	}
6723 	s->repo = repo;
6724 
6725 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6726 		err = add_color(&s->colors, "\\$$",
6727 		    TOG_COLOR_TREE_SUBMODULE,
6728 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6729 		if (err)
6730 			goto done;
6731 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6732 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6733 		if (err)
6734 			goto done;
6735 		err = add_color(&s->colors, "/$",
6736 		    TOG_COLOR_TREE_DIRECTORY,
6737 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6738 		if (err)
6739 			goto done;
6740 
6741 		err = add_color(&s->colors, "\\*$",
6742 		    TOG_COLOR_TREE_EXECUTABLE,
6743 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6744 		if (err)
6745 			goto done;
6746 
6747 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6748 		    get_color_value("TOG_COLOR_COMMIT"));
6749 		if (err)
6750 			goto done;
6751 	}
6752 
6753 	view->show = show_tree_view;
6754 	view->input = input_tree_view;
6755 	view->close = close_tree_view;
6756 	view->search_start = search_start_tree_view;
6757 	view->search_next = search_next_tree_view;
6758 done:
6759 	free(commit_id_str);
6760 	if (commit)
6761 		got_object_commit_close(commit);
6762 	if (err)
6763 		close_tree_view(view);
6764 	return err;
6765 }
6766 
6767 static const struct got_error *
6768 close_tree_view(struct tog_view *view)
6769 {
6770 	struct tog_tree_view_state *s = &view->state.tree;
6771 
6772 	free_colors(&s->colors);
6773 	free(s->tree_label);
6774 	s->tree_label = NULL;
6775 	free(s->commit_id);
6776 	s->commit_id = NULL;
6777 	free(s->head_ref_name);
6778 	s->head_ref_name = NULL;
6779 	while (!TAILQ_EMPTY(&s->parents)) {
6780 		struct tog_parent_tree *parent;
6781 		parent = TAILQ_FIRST(&s->parents);
6782 		TAILQ_REMOVE(&s->parents, parent, entry);
6783 		if (parent->tree != s->root)
6784 			got_object_tree_close(parent->tree);
6785 		free(parent);
6786 
6787 	}
6788 	if (s->tree != NULL && s->tree != s->root)
6789 		got_object_tree_close(s->tree);
6790 	if (s->root)
6791 		got_object_tree_close(s->root);
6792 	return NULL;
6793 }
6794 
6795 static const struct got_error *
6796 search_start_tree_view(struct tog_view *view)
6797 {
6798 	struct tog_tree_view_state *s = &view->state.tree;
6799 
6800 	s->matched_entry = NULL;
6801 	return NULL;
6802 }
6803 
6804 static int
6805 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6806 {
6807 	regmatch_t regmatch;
6808 
6809 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6810 	    0) == 0;
6811 }
6812 
6813 static const struct got_error *
6814 search_next_tree_view(struct tog_view *view)
6815 {
6816 	struct tog_tree_view_state *s = &view->state.tree;
6817 	struct got_tree_entry *te = NULL;
6818 
6819 	if (!view->searching) {
6820 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6821 		return NULL;
6822 	}
6823 
6824 	if (s->matched_entry) {
6825 		if (view->searching == TOG_SEARCH_FORWARD) {
6826 			if (s->selected_entry)
6827 				te = got_tree_entry_get_next(s->tree,
6828 				    s->selected_entry);
6829 			else
6830 				te = got_object_tree_get_first_entry(s->tree);
6831 		} else {
6832 			if (s->selected_entry == NULL)
6833 				te = got_object_tree_get_last_entry(s->tree);
6834 			else
6835 				te = got_tree_entry_get_prev(s->tree,
6836 				    s->selected_entry);
6837 		}
6838 	} else {
6839 		if (s->selected_entry)
6840 			te = s->selected_entry;
6841 		else if (view->searching == TOG_SEARCH_FORWARD)
6842 			te = got_object_tree_get_first_entry(s->tree);
6843 		else
6844 			te = got_object_tree_get_last_entry(s->tree);
6845 	}
6846 
6847 	while (1) {
6848 		if (te == NULL) {
6849 			if (s->matched_entry == NULL) {
6850 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6851 				return NULL;
6852 			}
6853 			if (view->searching == TOG_SEARCH_FORWARD)
6854 				te = got_object_tree_get_first_entry(s->tree);
6855 			else
6856 				te = got_object_tree_get_last_entry(s->tree);
6857 		}
6858 
6859 		if (match_tree_entry(te, &view->regex)) {
6860 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6861 			s->matched_entry = te;
6862 			break;
6863 		}
6864 
6865 		if (view->searching == TOG_SEARCH_FORWARD)
6866 			te = got_tree_entry_get_next(s->tree, te);
6867 		else
6868 			te = got_tree_entry_get_prev(s->tree, te);
6869 	}
6870 
6871 	if (s->matched_entry) {
6872 		s->first_displayed_entry = s->matched_entry;
6873 		s->selected = 0;
6874 	}
6875 
6876 	return NULL;
6877 }
6878 
6879 static const struct got_error *
6880 show_tree_view(struct tog_view *view)
6881 {
6882 	const struct got_error *err = NULL;
6883 	struct tog_tree_view_state *s = &view->state.tree;
6884 	char *parent_path;
6885 
6886 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6887 	if (err)
6888 		return err;
6889 
6890 	err = draw_tree_entries(view, parent_path);
6891 	free(parent_path);
6892 
6893 	view_border(view);
6894 	return err;
6895 }
6896 
6897 static const struct got_error *
6898 tree_goto_line(struct tog_view *view, int nlines)
6899 {
6900 	const struct got_error		 *err = NULL;
6901 	struct tog_tree_view_state	 *s = &view->state.tree;
6902 	struct got_tree_entry		**fte, **lte, **ste;
6903 	int				  g, last, first = 1, i = 1;
6904 	int				  root = s->tree == s->root;
6905 	int				  off = root ? 1 : 2;
6906 
6907 	g = view->gline;
6908 	view->gline = 0;
6909 
6910 	if (g == 0)
6911 		g = 1;
6912 	else if (g > got_object_tree_get_nentries(s->tree))
6913 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
6914 
6915 	fte = &s->first_displayed_entry;
6916 	lte = &s->last_displayed_entry;
6917 	ste = &s->selected_entry;
6918 
6919 	if (*fte != NULL) {
6920 		first = got_tree_entry_get_index(*fte);
6921 		first += off;  /* account for ".." */
6922 	}
6923 	last = got_tree_entry_get_index(*lte);
6924 	last += off;
6925 
6926 	if (g >= first && g <= last && g - first < nlines) {
6927 		s->selected = g - first;
6928 		return NULL;	/* gline is on the current page */
6929 	}
6930 
6931 	if (*ste != NULL) {
6932 		i = got_tree_entry_get_index(*ste);
6933 		i += off;
6934 	}
6935 
6936 	if (i < g) {
6937 		err = tree_scroll_down(view, g - i);
6938 		if (err)
6939 			return err;
6940 		if (got_tree_entry_get_index(*lte) >=
6941 		    got_object_tree_get_nentries(s->tree) - 1 &&
6942 		    first + s->selected < g &&
6943 		    s->selected < s->ndisplayed - 1) {
6944 			first = got_tree_entry_get_index(*fte);
6945 			first += off;
6946 			s->selected = g - first;
6947 		}
6948 	} else if (i > g)
6949 		tree_scroll_up(s, i - g);
6950 
6951 	if (g < nlines &&
6952 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
6953 		s->selected = g - 1;
6954 
6955 	return NULL;
6956 }
6957 
6958 static const struct got_error *
6959 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6960 {
6961 	const struct got_error *err = NULL;
6962 	struct tog_tree_view_state *s = &view->state.tree;
6963 	struct got_tree_entry *te;
6964 	int n, nscroll = view->nlines - 3;
6965 
6966 	if (view->gline)
6967 		return tree_goto_line(view, nscroll);
6968 
6969 	switch (ch) {
6970 	case 'i':
6971 		s->show_ids = !s->show_ids;
6972 		view->count = 0;
6973 		break;
6974 	case 'L':
6975 		view->count = 0;
6976 		if (!s->selected_entry)
6977 			break;
6978 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
6979 		break;
6980 	case 'R':
6981 		view->count = 0;
6982 		err = view_request_new(new_view, view, TOG_VIEW_REF);
6983 		break;
6984 	case 'g':
6985 	case KEY_HOME:
6986 		s->selected = 0;
6987 		view->count = 0;
6988 		if (s->tree == s->root)
6989 			s->first_displayed_entry =
6990 			    got_object_tree_get_first_entry(s->tree);
6991 		else
6992 			s->first_displayed_entry = NULL;
6993 		break;
6994 	case 'G':
6995 	case KEY_END: {
6996 		int eos = view->nlines - 3;
6997 
6998 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6999 			--eos;  /* border */
7000 		s->selected = 0;
7001 		view->count = 0;
7002 		te = got_object_tree_get_last_entry(s->tree);
7003 		for (n = 0; n < eos; n++) {
7004 			if (te == NULL) {
7005 				if (s->tree != s->root) {
7006 					s->first_displayed_entry = NULL;
7007 					n++;
7008 				}
7009 				break;
7010 			}
7011 			s->first_displayed_entry = te;
7012 			te = got_tree_entry_get_prev(s->tree, te);
7013 		}
7014 		if (n > 0)
7015 			s->selected = n - 1;
7016 		break;
7017 	}
7018 	case 'k':
7019 	case KEY_UP:
7020 	case CTRL('p'):
7021 		if (s->selected > 0) {
7022 			s->selected--;
7023 			break;
7024 		}
7025 		tree_scroll_up(s, 1);
7026 		if (s->selected_entry == NULL ||
7027 		    (s->tree == s->root && s->selected_entry ==
7028 		     got_object_tree_get_first_entry(s->tree)))
7029 			view->count = 0;
7030 		break;
7031 	case CTRL('u'):
7032 	case 'u':
7033 		nscroll /= 2;
7034 		/* FALL THROUGH */
7035 	case KEY_PPAGE:
7036 	case CTRL('b'):
7037 	case 'b':
7038 		if (s->tree == s->root) {
7039 			if (got_object_tree_get_first_entry(s->tree) ==
7040 			    s->first_displayed_entry)
7041 				s->selected -= MIN(s->selected, nscroll);
7042 		} else {
7043 			if (s->first_displayed_entry == NULL)
7044 				s->selected -= MIN(s->selected, nscroll);
7045 		}
7046 		tree_scroll_up(s, MAX(0, nscroll));
7047 		if (s->selected_entry == NULL ||
7048 		    (s->tree == s->root && s->selected_entry ==
7049 		     got_object_tree_get_first_entry(s->tree)))
7050 			view->count = 0;
7051 		break;
7052 	case 'j':
7053 	case KEY_DOWN:
7054 	case CTRL('n'):
7055 		if (s->selected < s->ndisplayed - 1) {
7056 			s->selected++;
7057 			break;
7058 		}
7059 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7060 		    == NULL) {
7061 			/* can't scroll any further */
7062 			view->count = 0;
7063 			break;
7064 		}
7065 		tree_scroll_down(view, 1);
7066 		break;
7067 	case CTRL('d'):
7068 	case 'd':
7069 		nscroll /= 2;
7070 		/* FALL THROUGH */
7071 	case KEY_NPAGE:
7072 	case CTRL('f'):
7073 	case 'f':
7074 	case ' ':
7075 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7076 		    == NULL) {
7077 			/* can't scroll any further; move cursor down */
7078 			if (s->selected < s->ndisplayed - 1)
7079 				s->selected += MIN(nscroll,
7080 				    s->ndisplayed - s->selected - 1);
7081 			else
7082 				view->count = 0;
7083 			break;
7084 		}
7085 		tree_scroll_down(view, nscroll);
7086 		break;
7087 	case KEY_ENTER:
7088 	case '\r':
7089 	case KEY_BACKSPACE:
7090 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7091 			struct tog_parent_tree *parent;
7092 			/* user selected '..' */
7093 			if (s->tree == s->root) {
7094 				view->count = 0;
7095 				break;
7096 			}
7097 			parent = TAILQ_FIRST(&s->parents);
7098 			TAILQ_REMOVE(&s->parents, parent,
7099 			    entry);
7100 			got_object_tree_close(s->tree);
7101 			s->tree = parent->tree;
7102 			s->first_displayed_entry =
7103 			    parent->first_displayed_entry;
7104 			s->selected_entry =
7105 			    parent->selected_entry;
7106 			s->selected = parent->selected;
7107 			if (s->selected > view->nlines - 3) {
7108 				err = offset_selection_down(view);
7109 				if (err)
7110 					break;
7111 			}
7112 			free(parent);
7113 		} else if (S_ISDIR(got_tree_entry_get_mode(
7114 		    s->selected_entry))) {
7115 			struct got_tree_object *subtree;
7116 			view->count = 0;
7117 			err = got_object_open_as_tree(&subtree, s->repo,
7118 			    got_tree_entry_get_id(s->selected_entry));
7119 			if (err)
7120 				break;
7121 			err = tree_view_visit_subtree(s, subtree);
7122 			if (err) {
7123 				got_object_tree_close(subtree);
7124 				break;
7125 			}
7126 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7127 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7128 		break;
7129 	case KEY_RESIZE:
7130 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7131 			s->selected = view->nlines - 4;
7132 		view->count = 0;
7133 		break;
7134 	default:
7135 		view->count = 0;
7136 		break;
7137 	}
7138 
7139 	return err;
7140 }
7141 
7142 __dead static void
7143 usage_tree(void)
7144 {
7145 	endwin();
7146 	fprintf(stderr,
7147 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7148 	    getprogname());
7149 	exit(1);
7150 }
7151 
7152 static const struct got_error *
7153 cmd_tree(int argc, char *argv[])
7154 {
7155 	const struct got_error *error;
7156 	struct got_repository *repo = NULL;
7157 	struct got_worktree *worktree = NULL;
7158 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7159 	struct got_object_id *commit_id = NULL;
7160 	struct got_commit_object *commit = NULL;
7161 	const char *commit_id_arg = NULL;
7162 	char *label = NULL;
7163 	struct got_reference *ref = NULL;
7164 	const char *head_ref_name = NULL;
7165 	int ch;
7166 	struct tog_view *view;
7167 	int *pack_fds = NULL;
7168 
7169 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7170 		switch (ch) {
7171 		case 'c':
7172 			commit_id_arg = optarg;
7173 			break;
7174 		case 'r':
7175 			repo_path = realpath(optarg, NULL);
7176 			if (repo_path == NULL)
7177 				return got_error_from_errno2("realpath",
7178 				    optarg);
7179 			break;
7180 		default:
7181 			usage_tree();
7182 			/* NOTREACHED */
7183 		}
7184 	}
7185 
7186 	argc -= optind;
7187 	argv += optind;
7188 
7189 	if (argc > 1)
7190 		usage_tree();
7191 
7192 	error = got_repo_pack_fds_open(&pack_fds);
7193 	if (error != NULL)
7194 		goto done;
7195 
7196 	if (repo_path == NULL) {
7197 		cwd = getcwd(NULL, 0);
7198 		if (cwd == NULL)
7199 			return got_error_from_errno("getcwd");
7200 		error = got_worktree_open(&worktree, cwd);
7201 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7202 			goto done;
7203 		if (worktree)
7204 			repo_path =
7205 			    strdup(got_worktree_get_repo_path(worktree));
7206 		else
7207 			repo_path = strdup(cwd);
7208 		if (repo_path == NULL) {
7209 			error = got_error_from_errno("strdup");
7210 			goto done;
7211 		}
7212 	}
7213 
7214 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7215 	if (error != NULL)
7216 		goto done;
7217 
7218 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7219 	    repo, worktree);
7220 	if (error)
7221 		goto done;
7222 
7223 	init_curses();
7224 
7225 	error = apply_unveil(got_repo_get_path(repo), NULL);
7226 	if (error)
7227 		goto done;
7228 
7229 	error = tog_load_refs(repo, 0);
7230 	if (error)
7231 		goto done;
7232 
7233 	if (commit_id_arg == NULL) {
7234 		error = got_repo_match_object_id(&commit_id, &label,
7235 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7236 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7237 		if (error)
7238 			goto done;
7239 		head_ref_name = label;
7240 	} else {
7241 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7242 		if (error == NULL)
7243 			head_ref_name = got_ref_get_name(ref);
7244 		else if (error->code != GOT_ERR_NOT_REF)
7245 			goto done;
7246 		error = got_repo_match_object_id(&commit_id, NULL,
7247 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7248 		if (error)
7249 			goto done;
7250 	}
7251 
7252 	error = got_object_open_as_commit(&commit, repo, commit_id);
7253 	if (error)
7254 		goto done;
7255 
7256 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7257 	if (view == NULL) {
7258 		error = got_error_from_errno("view_open");
7259 		goto done;
7260 	}
7261 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7262 	if (error)
7263 		goto done;
7264 	if (!got_path_is_root_dir(in_repo_path)) {
7265 		error = tree_view_walk_path(&view->state.tree, commit,
7266 		    in_repo_path);
7267 		if (error)
7268 			goto done;
7269 	}
7270 
7271 	if (worktree) {
7272 		/* Release work tree lock. */
7273 		got_worktree_close(worktree);
7274 		worktree = NULL;
7275 	}
7276 	error = view_loop(view);
7277 done:
7278 	free(repo_path);
7279 	free(cwd);
7280 	free(commit_id);
7281 	free(label);
7282 	if (ref)
7283 		got_ref_close(ref);
7284 	if (repo) {
7285 		const struct got_error *close_err = got_repo_close(repo);
7286 		if (error == NULL)
7287 			error = close_err;
7288 	}
7289 	if (pack_fds) {
7290 		const struct got_error *pack_err =
7291 		    got_repo_pack_fds_close(pack_fds);
7292 		if (error == NULL)
7293 			error = pack_err;
7294 	}
7295 	tog_free_refs();
7296 	return error;
7297 }
7298 
7299 static const struct got_error *
7300 ref_view_load_refs(struct tog_ref_view_state *s)
7301 {
7302 	struct got_reflist_entry *sre;
7303 	struct tog_reflist_entry *re;
7304 
7305 	s->nrefs = 0;
7306 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7307 		if (strncmp(got_ref_get_name(sre->ref),
7308 		    "refs/got/", 9) == 0 &&
7309 		    strncmp(got_ref_get_name(sre->ref),
7310 		    "refs/got/backup/", 16) != 0)
7311 			continue;
7312 
7313 		re = malloc(sizeof(*re));
7314 		if (re == NULL)
7315 			return got_error_from_errno("malloc");
7316 
7317 		re->ref = got_ref_dup(sre->ref);
7318 		if (re->ref == NULL)
7319 			return got_error_from_errno("got_ref_dup");
7320 		re->idx = s->nrefs++;
7321 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7322 	}
7323 
7324 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7325 	return NULL;
7326 }
7327 
7328 static void
7329 ref_view_free_refs(struct tog_ref_view_state *s)
7330 {
7331 	struct tog_reflist_entry *re;
7332 
7333 	while (!TAILQ_EMPTY(&s->refs)) {
7334 		re = TAILQ_FIRST(&s->refs);
7335 		TAILQ_REMOVE(&s->refs, re, entry);
7336 		got_ref_close(re->ref);
7337 		free(re);
7338 	}
7339 }
7340 
7341 static const struct got_error *
7342 open_ref_view(struct tog_view *view, struct got_repository *repo)
7343 {
7344 	const struct got_error *err = NULL;
7345 	struct tog_ref_view_state *s = &view->state.ref;
7346 
7347 	s->selected_entry = 0;
7348 	s->repo = repo;
7349 
7350 	TAILQ_INIT(&s->refs);
7351 	STAILQ_INIT(&s->colors);
7352 
7353 	err = ref_view_load_refs(s);
7354 	if (err)
7355 		return err;
7356 
7357 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7358 		err = add_color(&s->colors, "^refs/heads/",
7359 		    TOG_COLOR_REFS_HEADS,
7360 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7361 		if (err)
7362 			goto done;
7363 
7364 		err = add_color(&s->colors, "^refs/tags/",
7365 		    TOG_COLOR_REFS_TAGS,
7366 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7367 		if (err)
7368 			goto done;
7369 
7370 		err = add_color(&s->colors, "^refs/remotes/",
7371 		    TOG_COLOR_REFS_REMOTES,
7372 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7373 		if (err)
7374 			goto done;
7375 
7376 		err = add_color(&s->colors, "^refs/got/backup/",
7377 		    TOG_COLOR_REFS_BACKUP,
7378 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7379 		if (err)
7380 			goto done;
7381 	}
7382 
7383 	view->show = show_ref_view;
7384 	view->input = input_ref_view;
7385 	view->close = close_ref_view;
7386 	view->search_start = search_start_ref_view;
7387 	view->search_next = search_next_ref_view;
7388 done:
7389 	if (err)
7390 		free_colors(&s->colors);
7391 	return err;
7392 }
7393 
7394 static const struct got_error *
7395 close_ref_view(struct tog_view *view)
7396 {
7397 	struct tog_ref_view_state *s = &view->state.ref;
7398 
7399 	ref_view_free_refs(s);
7400 	free_colors(&s->colors);
7401 
7402 	return NULL;
7403 }
7404 
7405 static const struct got_error *
7406 resolve_reflist_entry(struct got_object_id **commit_id,
7407     struct tog_reflist_entry *re, struct got_repository *repo)
7408 {
7409 	const struct got_error *err = NULL;
7410 	struct got_object_id *obj_id;
7411 	struct got_tag_object *tag = NULL;
7412 	int obj_type;
7413 
7414 	*commit_id = NULL;
7415 
7416 	err = got_ref_resolve(&obj_id, repo, re->ref);
7417 	if (err)
7418 		return err;
7419 
7420 	err = got_object_get_type(&obj_type, repo, obj_id);
7421 	if (err)
7422 		goto done;
7423 
7424 	switch (obj_type) {
7425 	case GOT_OBJ_TYPE_COMMIT:
7426 		*commit_id = obj_id;
7427 		break;
7428 	case GOT_OBJ_TYPE_TAG:
7429 		err = got_object_open_as_tag(&tag, repo, obj_id);
7430 		if (err)
7431 			goto done;
7432 		free(obj_id);
7433 		err = got_object_get_type(&obj_type, repo,
7434 		    got_object_tag_get_object_id(tag));
7435 		if (err)
7436 			goto done;
7437 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7438 			err = got_error(GOT_ERR_OBJ_TYPE);
7439 			goto done;
7440 		}
7441 		*commit_id = got_object_id_dup(
7442 		    got_object_tag_get_object_id(tag));
7443 		if (*commit_id == NULL) {
7444 			err = got_error_from_errno("got_object_id_dup");
7445 			goto done;
7446 		}
7447 		break;
7448 	default:
7449 		err = got_error(GOT_ERR_OBJ_TYPE);
7450 		break;
7451 	}
7452 
7453 done:
7454 	if (tag)
7455 		got_object_tag_close(tag);
7456 	if (err) {
7457 		free(*commit_id);
7458 		*commit_id = NULL;
7459 	}
7460 	return err;
7461 }
7462 
7463 static const struct got_error *
7464 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7465     struct tog_reflist_entry *re, struct got_repository *repo)
7466 {
7467 	struct tog_view *log_view;
7468 	const struct got_error *err = NULL;
7469 	struct got_object_id *commit_id = NULL;
7470 
7471 	*new_view = NULL;
7472 
7473 	err = resolve_reflist_entry(&commit_id, re, repo);
7474 	if (err) {
7475 		if (err->code != GOT_ERR_OBJ_TYPE)
7476 			return err;
7477 		else
7478 			return NULL;
7479 	}
7480 
7481 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7482 	if (log_view == NULL) {
7483 		err = got_error_from_errno("view_open");
7484 		goto done;
7485 	}
7486 
7487 	err = open_log_view(log_view, commit_id, repo,
7488 	    got_ref_get_name(re->ref), "", 0);
7489 done:
7490 	if (err)
7491 		view_close(log_view);
7492 	else
7493 		*new_view = log_view;
7494 	free(commit_id);
7495 	return err;
7496 }
7497 
7498 static void
7499 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7500 {
7501 	struct tog_reflist_entry *re;
7502 	int i = 0;
7503 
7504 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7505 		return;
7506 
7507 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7508 	while (i++ < maxscroll) {
7509 		if (re == NULL)
7510 			break;
7511 		s->first_displayed_entry = re;
7512 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7513 	}
7514 }
7515 
7516 static const struct got_error *
7517 ref_scroll_down(struct tog_view *view, int maxscroll)
7518 {
7519 	struct tog_ref_view_state *s = &view->state.ref;
7520 	struct tog_reflist_entry *next, *last;
7521 	int n = 0;
7522 
7523 	if (s->first_displayed_entry)
7524 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7525 	else
7526 		next = TAILQ_FIRST(&s->refs);
7527 
7528 	last = s->last_displayed_entry;
7529 	while (next && n++ < maxscroll) {
7530 		if (last) {
7531 			s->last_displayed_entry = last;
7532 			last = TAILQ_NEXT(last, entry);
7533 		}
7534 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7535 			s->first_displayed_entry = next;
7536 			next = TAILQ_NEXT(next, entry);
7537 		}
7538 	}
7539 
7540 	return NULL;
7541 }
7542 
7543 static const struct got_error *
7544 search_start_ref_view(struct tog_view *view)
7545 {
7546 	struct tog_ref_view_state *s = &view->state.ref;
7547 
7548 	s->matched_entry = NULL;
7549 	return NULL;
7550 }
7551 
7552 static int
7553 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7554 {
7555 	regmatch_t regmatch;
7556 
7557 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7558 	    0) == 0;
7559 }
7560 
7561 static const struct got_error *
7562 search_next_ref_view(struct tog_view *view)
7563 {
7564 	struct tog_ref_view_state *s = &view->state.ref;
7565 	struct tog_reflist_entry *re = NULL;
7566 
7567 	if (!view->searching) {
7568 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7569 		return NULL;
7570 	}
7571 
7572 	if (s->matched_entry) {
7573 		if (view->searching == TOG_SEARCH_FORWARD) {
7574 			if (s->selected_entry)
7575 				re = TAILQ_NEXT(s->selected_entry, entry);
7576 			else
7577 				re = TAILQ_PREV(s->selected_entry,
7578 				    tog_reflist_head, entry);
7579 		} else {
7580 			if (s->selected_entry == NULL)
7581 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7582 			else
7583 				re = TAILQ_PREV(s->selected_entry,
7584 				    tog_reflist_head, entry);
7585 		}
7586 	} else {
7587 		if (s->selected_entry)
7588 			re = s->selected_entry;
7589 		else if (view->searching == TOG_SEARCH_FORWARD)
7590 			re = TAILQ_FIRST(&s->refs);
7591 		else
7592 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7593 	}
7594 
7595 	while (1) {
7596 		if (re == NULL) {
7597 			if (s->matched_entry == NULL) {
7598 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7599 				return NULL;
7600 			}
7601 			if (view->searching == TOG_SEARCH_FORWARD)
7602 				re = TAILQ_FIRST(&s->refs);
7603 			else
7604 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7605 		}
7606 
7607 		if (match_reflist_entry(re, &view->regex)) {
7608 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7609 			s->matched_entry = re;
7610 			break;
7611 		}
7612 
7613 		if (view->searching == TOG_SEARCH_FORWARD)
7614 			re = TAILQ_NEXT(re, entry);
7615 		else
7616 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7617 	}
7618 
7619 	if (s->matched_entry) {
7620 		s->first_displayed_entry = s->matched_entry;
7621 		s->selected = 0;
7622 	}
7623 
7624 	return NULL;
7625 }
7626 
7627 static const struct got_error *
7628 show_ref_view(struct tog_view *view)
7629 {
7630 	const struct got_error *err = NULL;
7631 	struct tog_ref_view_state *s = &view->state.ref;
7632 	struct tog_reflist_entry *re;
7633 	char *line = NULL;
7634 	wchar_t *wline;
7635 	struct tog_color *tc;
7636 	int width, n;
7637 	int limit = view->nlines;
7638 
7639 	werase(view->window);
7640 
7641 	s->ndisplayed = 0;
7642 	if (view_is_hsplit_top(view))
7643 		--limit;  /* border */
7644 
7645 	if (limit == 0)
7646 		return NULL;
7647 
7648 	re = s->first_displayed_entry;
7649 
7650 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7651 	    s->nrefs) == -1)
7652 		return got_error_from_errno("asprintf");
7653 
7654 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7655 	if (err) {
7656 		free(line);
7657 		return err;
7658 	}
7659 	if (view_needs_focus_indication(view))
7660 		wstandout(view->window);
7661 	waddwstr(view->window, wline);
7662 	if (view_needs_focus_indication(view))
7663 		wstandend(view->window);
7664 	free(wline);
7665 	wline = NULL;
7666 	free(line);
7667 	line = NULL;
7668 	if (width < view->ncols - 1)
7669 		waddch(view->window, '\n');
7670 	if (--limit <= 0)
7671 		return NULL;
7672 
7673 	n = 0;
7674 	while (re && limit > 0) {
7675 		char *line = NULL;
7676 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7677 
7678 		if (s->show_date) {
7679 			struct got_commit_object *ci;
7680 			struct got_tag_object *tag;
7681 			struct got_object_id *id;
7682 			struct tm tm;
7683 			time_t t;
7684 
7685 			err = got_ref_resolve(&id, s->repo, re->ref);
7686 			if (err)
7687 				return err;
7688 			err = got_object_open_as_tag(&tag, s->repo, id);
7689 			if (err) {
7690 				if (err->code != GOT_ERR_OBJ_TYPE) {
7691 					free(id);
7692 					return err;
7693 				}
7694 				err = got_object_open_as_commit(&ci, s->repo,
7695 				    id);
7696 				if (err) {
7697 					free(id);
7698 					return err;
7699 				}
7700 				t = got_object_commit_get_committer_time(ci);
7701 				got_object_commit_close(ci);
7702 			} else {
7703 				t = got_object_tag_get_tagger_time(tag);
7704 				got_object_tag_close(tag);
7705 			}
7706 			free(id);
7707 			if (gmtime_r(&t, &tm) == NULL)
7708 				return got_error_from_errno("gmtime_r");
7709 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7710 				return got_error(GOT_ERR_NO_SPACE);
7711 		}
7712 		if (got_ref_is_symbolic(re->ref)) {
7713 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7714 			    ymd : "", got_ref_get_name(re->ref),
7715 			    got_ref_get_symref_target(re->ref)) == -1)
7716 				return got_error_from_errno("asprintf");
7717 		} else if (s->show_ids) {
7718 			struct got_object_id *id;
7719 			char *id_str;
7720 			err = got_ref_resolve(&id, s->repo, re->ref);
7721 			if (err)
7722 				return err;
7723 			err = got_object_id_str(&id_str, id);
7724 			if (err) {
7725 				free(id);
7726 				return err;
7727 			}
7728 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7729 			    got_ref_get_name(re->ref), id_str) == -1) {
7730 				err = got_error_from_errno("asprintf");
7731 				free(id);
7732 				free(id_str);
7733 				return err;
7734 			}
7735 			free(id);
7736 			free(id_str);
7737 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7738 		    got_ref_get_name(re->ref)) == -1)
7739 			return got_error_from_errno("asprintf");
7740 
7741 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7742 		    0, 0);
7743 		if (err) {
7744 			free(line);
7745 			return err;
7746 		}
7747 		if (n == s->selected) {
7748 			if (view->focussed)
7749 				wstandout(view->window);
7750 			s->selected_entry = re;
7751 		}
7752 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7753 		if (tc)
7754 			wattr_on(view->window,
7755 			    COLOR_PAIR(tc->colorpair), NULL);
7756 		waddwstr(view->window, wline);
7757 		if (tc)
7758 			wattr_off(view->window,
7759 			    COLOR_PAIR(tc->colorpair), NULL);
7760 		if (width < view->ncols - 1)
7761 			waddch(view->window, '\n');
7762 		if (n == s->selected && view->focussed)
7763 			wstandend(view->window);
7764 		free(line);
7765 		free(wline);
7766 		wline = NULL;
7767 		n++;
7768 		s->ndisplayed++;
7769 		s->last_displayed_entry = re;
7770 
7771 		limit--;
7772 		re = TAILQ_NEXT(re, entry);
7773 	}
7774 
7775 	view_border(view);
7776 	return err;
7777 }
7778 
7779 static const struct got_error *
7780 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7781     struct tog_reflist_entry *re, struct got_repository *repo)
7782 {
7783 	const struct got_error *err = NULL;
7784 	struct got_object_id *commit_id = NULL;
7785 	struct tog_view *tree_view;
7786 
7787 	*new_view = NULL;
7788 
7789 	err = resolve_reflist_entry(&commit_id, re, repo);
7790 	if (err) {
7791 		if (err->code != GOT_ERR_OBJ_TYPE)
7792 			return err;
7793 		else
7794 			return NULL;
7795 	}
7796 
7797 
7798 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7799 	if (tree_view == NULL) {
7800 		err = got_error_from_errno("view_open");
7801 		goto done;
7802 	}
7803 
7804 	err = open_tree_view(tree_view, commit_id,
7805 	    got_ref_get_name(re->ref), repo);
7806 	if (err)
7807 		goto done;
7808 
7809 	*new_view = tree_view;
7810 done:
7811 	free(commit_id);
7812 	return err;
7813 }
7814 
7815 static const struct got_error *
7816 ref_goto_line(struct tog_view *view, int nlines)
7817 {
7818 	const struct got_error		*err = NULL;
7819 	struct tog_ref_view_state	*s = &view->state.ref;
7820 	int				 g, idx = s->selected_entry->idx;
7821 
7822 	g = view->gline;
7823 	view->gline = 0;
7824 
7825 	if (g == 0)
7826 		g = 1;
7827 	else if (g > s->nrefs)
7828 		g = s->nrefs;
7829 
7830 	if (g >= s->first_displayed_entry->idx + 1 &&
7831 	    g <= s->last_displayed_entry->idx + 1 &&
7832 	    g - s->first_displayed_entry->idx - 1 < nlines) {
7833 		s->selected = g - s->first_displayed_entry->idx - 1;
7834 		return NULL;
7835 	}
7836 
7837 	if (idx + 1 < g) {
7838 		err = ref_scroll_down(view, g - idx - 1);
7839 		if (err)
7840 			return err;
7841 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
7842 		    s->first_displayed_entry->idx + s->selected < g &&
7843 		    s->selected < s->ndisplayed - 1)
7844 			s->selected = g - s->first_displayed_entry->idx - 1;
7845 	} else if (idx + 1 > g)
7846 		ref_scroll_up(s, idx - g + 1);
7847 
7848 	if (g < nlines && s->first_displayed_entry->idx == 0)
7849 		s->selected = g - 1;
7850 
7851 	return NULL;
7852 
7853 }
7854 
7855 static const struct got_error *
7856 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7857 {
7858 	const struct got_error *err = NULL;
7859 	struct tog_ref_view_state *s = &view->state.ref;
7860 	struct tog_reflist_entry *re;
7861 	int n, nscroll = view->nlines - 1;
7862 
7863 	if (view->gline)
7864 		return ref_goto_line(view, nscroll);
7865 
7866 	switch (ch) {
7867 	case 'i':
7868 		s->show_ids = !s->show_ids;
7869 		view->count = 0;
7870 		break;
7871 	case 'm':
7872 		s->show_date = !s->show_date;
7873 		view->count = 0;
7874 		break;
7875 	case 'o':
7876 		s->sort_by_date = !s->sort_by_date;
7877 		view->count = 0;
7878 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7879 		    got_ref_cmp_by_commit_timestamp_descending :
7880 		    tog_ref_cmp_by_name, s->repo);
7881 		if (err)
7882 			break;
7883 		got_reflist_object_id_map_free(tog_refs_idmap);
7884 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7885 		    &tog_refs, s->repo);
7886 		if (err)
7887 			break;
7888 		ref_view_free_refs(s);
7889 		err = ref_view_load_refs(s);
7890 		break;
7891 	case KEY_ENTER:
7892 	case '\r':
7893 		view->count = 0;
7894 		if (!s->selected_entry)
7895 			break;
7896 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7897 		break;
7898 	case 'T':
7899 		view->count = 0;
7900 		if (!s->selected_entry)
7901 			break;
7902 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
7903 		break;
7904 	case 'g':
7905 	case KEY_HOME:
7906 		s->selected = 0;
7907 		view->count = 0;
7908 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7909 		break;
7910 	case 'G':
7911 	case KEY_END: {
7912 		int eos = view->nlines - 1;
7913 
7914 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7915 			--eos;  /* border */
7916 		s->selected = 0;
7917 		view->count = 0;
7918 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7919 		for (n = 0; n < eos; n++) {
7920 			if (re == NULL)
7921 				break;
7922 			s->first_displayed_entry = re;
7923 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7924 		}
7925 		if (n > 0)
7926 			s->selected = n - 1;
7927 		break;
7928 	}
7929 	case 'k':
7930 	case KEY_UP:
7931 	case CTRL('p'):
7932 		if (s->selected > 0) {
7933 			s->selected--;
7934 			break;
7935 		}
7936 		ref_scroll_up(s, 1);
7937 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7938 			view->count = 0;
7939 		break;
7940 	case CTRL('u'):
7941 	case 'u':
7942 		nscroll /= 2;
7943 		/* FALL THROUGH */
7944 	case KEY_PPAGE:
7945 	case CTRL('b'):
7946 	case 'b':
7947 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7948 			s->selected -= MIN(nscroll, s->selected);
7949 		ref_scroll_up(s, MAX(0, nscroll));
7950 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7951 			view->count = 0;
7952 		break;
7953 	case 'j':
7954 	case KEY_DOWN:
7955 	case CTRL('n'):
7956 		if (s->selected < s->ndisplayed - 1) {
7957 			s->selected++;
7958 			break;
7959 		}
7960 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7961 			/* can't scroll any further */
7962 			view->count = 0;
7963 			break;
7964 		}
7965 		ref_scroll_down(view, 1);
7966 		break;
7967 	case CTRL('d'):
7968 	case 'd':
7969 		nscroll /= 2;
7970 		/* FALL THROUGH */
7971 	case KEY_NPAGE:
7972 	case CTRL('f'):
7973 	case 'f':
7974 	case ' ':
7975 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7976 			/* can't scroll any further; move cursor down */
7977 			if (s->selected < s->ndisplayed - 1)
7978 				s->selected += MIN(nscroll,
7979 				    s->ndisplayed - s->selected - 1);
7980 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7981 				s->selected += s->ndisplayed - s->selected - 1;
7982 			view->count = 0;
7983 			break;
7984 		}
7985 		ref_scroll_down(view, nscroll);
7986 		break;
7987 	case CTRL('l'):
7988 		view->count = 0;
7989 		tog_free_refs();
7990 		err = tog_load_refs(s->repo, s->sort_by_date);
7991 		if (err)
7992 			break;
7993 		ref_view_free_refs(s);
7994 		err = ref_view_load_refs(s);
7995 		break;
7996 	case KEY_RESIZE:
7997 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7998 			s->selected = view->nlines - 2;
7999 		break;
8000 	default:
8001 		view->count = 0;
8002 		break;
8003 	}
8004 
8005 	return err;
8006 }
8007 
8008 __dead static void
8009 usage_ref(void)
8010 {
8011 	endwin();
8012 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8013 	    getprogname());
8014 	exit(1);
8015 }
8016 
8017 static const struct got_error *
8018 cmd_ref(int argc, char *argv[])
8019 {
8020 	const struct got_error *error;
8021 	struct got_repository *repo = NULL;
8022 	struct got_worktree *worktree = NULL;
8023 	char *cwd = NULL, *repo_path = NULL;
8024 	int ch;
8025 	struct tog_view *view;
8026 	int *pack_fds = NULL;
8027 
8028 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8029 		switch (ch) {
8030 		case 'r':
8031 			repo_path = realpath(optarg, NULL);
8032 			if (repo_path == NULL)
8033 				return got_error_from_errno2("realpath",
8034 				    optarg);
8035 			break;
8036 		default:
8037 			usage_ref();
8038 			/* NOTREACHED */
8039 		}
8040 	}
8041 
8042 	argc -= optind;
8043 	argv += optind;
8044 
8045 	if (argc > 1)
8046 		usage_ref();
8047 
8048 	error = got_repo_pack_fds_open(&pack_fds);
8049 	if (error != NULL)
8050 		goto done;
8051 
8052 	if (repo_path == NULL) {
8053 		cwd = getcwd(NULL, 0);
8054 		if (cwd == NULL)
8055 			return got_error_from_errno("getcwd");
8056 		error = got_worktree_open(&worktree, cwd);
8057 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8058 			goto done;
8059 		if (worktree)
8060 			repo_path =
8061 			    strdup(got_worktree_get_repo_path(worktree));
8062 		else
8063 			repo_path = strdup(cwd);
8064 		if (repo_path == NULL) {
8065 			error = got_error_from_errno("strdup");
8066 			goto done;
8067 		}
8068 	}
8069 
8070 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8071 	if (error != NULL)
8072 		goto done;
8073 
8074 	init_curses();
8075 
8076 	error = apply_unveil(got_repo_get_path(repo), NULL);
8077 	if (error)
8078 		goto done;
8079 
8080 	error = tog_load_refs(repo, 0);
8081 	if (error)
8082 		goto done;
8083 
8084 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8085 	if (view == NULL) {
8086 		error = got_error_from_errno("view_open");
8087 		goto done;
8088 	}
8089 
8090 	error = open_ref_view(view, repo);
8091 	if (error)
8092 		goto done;
8093 
8094 	if (worktree) {
8095 		/* Release work tree lock. */
8096 		got_worktree_close(worktree);
8097 		worktree = NULL;
8098 	}
8099 	error = view_loop(view);
8100 done:
8101 	free(repo_path);
8102 	free(cwd);
8103 	if (repo) {
8104 		const struct got_error *close_err = got_repo_close(repo);
8105 		if (close_err)
8106 			error = close_err;
8107 	}
8108 	if (pack_fds) {
8109 		const struct got_error *pack_err =
8110 		    got_repo_pack_fds_close(pack_fds);
8111 		if (error == NULL)
8112 			error = pack_err;
8113 	}
8114 	tog_free_refs();
8115 	return error;
8116 }
8117 
8118 static const struct got_error *
8119 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8120     enum tog_view_type request, int y, int x)
8121 {
8122 	const struct got_error *err = NULL;
8123 
8124 	*new_view = NULL;
8125 
8126 	switch (request) {
8127 	case TOG_VIEW_DIFF:
8128 		if (view->type == TOG_VIEW_LOG) {
8129 			struct tog_log_view_state *s = &view->state.log;
8130 
8131 			err = open_diff_view_for_commit(new_view, y, x,
8132 			    s->selected_entry->commit, s->selected_entry->id,
8133 			    view, s->repo);
8134 		} else
8135 			return got_error_msg(GOT_ERR_NOT_IMPL,
8136 			    "parent/child view pair not supported");
8137 		break;
8138 	case TOG_VIEW_BLAME:
8139 		if (view->type == TOG_VIEW_TREE) {
8140 			struct tog_tree_view_state *s = &view->state.tree;
8141 
8142 			err = blame_tree_entry(new_view, y, x,
8143 			    s->selected_entry, &s->parents, s->commit_id,
8144 			    s->repo);
8145 		} else
8146 			return got_error_msg(GOT_ERR_NOT_IMPL,
8147 			    "parent/child view pair not supported");
8148 		break;
8149 	case TOG_VIEW_LOG:
8150 		if (view->type == TOG_VIEW_BLAME)
8151 			err = log_annotated_line(new_view, y, x,
8152 			    view->state.blame.repo, view->state.blame.id_to_log);
8153 		else if (view->type == TOG_VIEW_TREE)
8154 			err = log_selected_tree_entry(new_view, y, x,
8155 			    &view->state.tree);
8156 		else if (view->type == TOG_VIEW_REF)
8157 			err = log_ref_entry(new_view, y, x,
8158 			    view->state.ref.selected_entry,
8159 			    view->state.ref.repo);
8160 		else
8161 			return got_error_msg(GOT_ERR_NOT_IMPL,
8162 			    "parent/child view pair not supported");
8163 		break;
8164 	case TOG_VIEW_TREE:
8165 		if (view->type == TOG_VIEW_LOG)
8166 			err = browse_commit_tree(new_view, y, x,
8167 			    view->state.log.selected_entry,
8168 			    view->state.log.in_repo_path,
8169 			    view->state.log.head_ref_name,
8170 			    view->state.log.repo);
8171 		else if (view->type == TOG_VIEW_REF)
8172 			err = browse_ref_tree(new_view, y, x,
8173 			    view->state.ref.selected_entry,
8174 			    view->state.ref.repo);
8175 		else
8176 			return got_error_msg(GOT_ERR_NOT_IMPL,
8177 			    "parent/child view pair not supported");
8178 		break;
8179 	case TOG_VIEW_REF:
8180 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8181 		if (*new_view == NULL)
8182 			return got_error_from_errno("view_open");
8183 		if (view->type == TOG_VIEW_LOG)
8184 			err = open_ref_view(*new_view, view->state.log.repo);
8185 		else if (view->type == TOG_VIEW_TREE)
8186 			err = open_ref_view(*new_view, view->state.tree.repo);
8187 		else
8188 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8189 			    "parent/child view pair not supported");
8190 		if (err)
8191 			view_close(*new_view);
8192 		break;
8193 	default:
8194 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8195 	}
8196 
8197 	return err;
8198 }
8199 
8200 /*
8201  * If view was scrolled down to move the selected line into view when opening a
8202  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8203  */
8204 static void
8205 offset_selection_up(struct tog_view *view)
8206 {
8207 	switch (view->type) {
8208 	case TOG_VIEW_BLAME: {
8209 		struct tog_blame_view_state *s = &view->state.blame;
8210 		if (s->first_displayed_line == 1) {
8211 			s->selected_line = MAX(s->selected_line - view->offset,
8212 			    1);
8213 			break;
8214 		}
8215 		if (s->first_displayed_line > view->offset)
8216 			s->first_displayed_line -= view->offset;
8217 		else
8218 			s->first_displayed_line = 1;
8219 		s->selected_line += view->offset;
8220 		break;
8221 	}
8222 	case TOG_VIEW_LOG:
8223 		log_scroll_up(&view->state.log, view->offset);
8224 		view->state.log.selected += view->offset;
8225 		break;
8226 	case TOG_VIEW_REF:
8227 		ref_scroll_up(&view->state.ref, view->offset);
8228 		view->state.ref.selected += view->offset;
8229 		break;
8230 	case TOG_VIEW_TREE:
8231 		tree_scroll_up(&view->state.tree, view->offset);
8232 		view->state.tree.selected += view->offset;
8233 		break;
8234 	default:
8235 		break;
8236 	}
8237 
8238 	view->offset = 0;
8239 }
8240 
8241 /*
8242  * If the selected line is in the section of screen covered by the bottom split,
8243  * scroll down offset lines to move it into view and index its new position.
8244  */
8245 static const struct got_error *
8246 offset_selection_down(struct tog_view *view)
8247 {
8248 	const struct got_error	*err = NULL;
8249 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8250 	int			*selected = NULL;
8251 	int			 header, offset;
8252 
8253 	switch (view->type) {
8254 	case TOG_VIEW_BLAME: {
8255 		struct tog_blame_view_state *s = &view->state.blame;
8256 		header = 3;
8257 		scrolld = NULL;
8258 		if (s->selected_line > view->nlines - header) {
8259 			offset = abs(view->nlines - s->selected_line - header);
8260 			s->first_displayed_line += offset;
8261 			s->selected_line -= offset;
8262 			view->offset = offset;
8263 		}
8264 		break;
8265 	}
8266 	case TOG_VIEW_LOG: {
8267 		struct tog_log_view_state *s = &view->state.log;
8268 		scrolld = &log_scroll_down;
8269 		header = view_is_parent_view(view) ? 3 : 2;
8270 		selected = &s->selected;
8271 		break;
8272 	}
8273 	case TOG_VIEW_REF: {
8274 		struct tog_ref_view_state *s = &view->state.ref;
8275 		scrolld = &ref_scroll_down;
8276 		header = 3;
8277 		selected = &s->selected;
8278 		break;
8279 	}
8280 	case TOG_VIEW_TREE: {
8281 		struct tog_tree_view_state *s = &view->state.tree;
8282 		scrolld = &tree_scroll_down;
8283 		header = 5;
8284 		selected = &s->selected;
8285 		break;
8286 	}
8287 	default:
8288 		selected = NULL;
8289 		scrolld = NULL;
8290 		header = 0;
8291 		break;
8292 	}
8293 
8294 	if (selected && *selected > view->nlines - header) {
8295 		offset = abs(view->nlines - *selected - header);
8296 		view->offset = offset;
8297 		if (scrolld && offset) {
8298 			err = scrolld(view, offset);
8299 			*selected -= offset;
8300 		}
8301 	}
8302 
8303 	return err;
8304 }
8305 
8306 static void
8307 list_commands(FILE *fp)
8308 {
8309 	size_t i;
8310 
8311 	fprintf(fp, "commands:");
8312 	for (i = 0; i < nitems(tog_commands); i++) {
8313 		const struct tog_cmd *cmd = &tog_commands[i];
8314 		fprintf(fp, " %s", cmd->name);
8315 	}
8316 	fputc('\n', fp);
8317 }
8318 
8319 __dead static void
8320 usage(int hflag, int status)
8321 {
8322 	FILE *fp = (status == 0) ? stdout : stderr;
8323 
8324 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8325 	    getprogname());
8326 	if (hflag) {
8327 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8328 		list_commands(fp);
8329 	}
8330 	exit(status);
8331 }
8332 
8333 static char **
8334 make_argv(int argc, ...)
8335 {
8336 	va_list ap;
8337 	char **argv;
8338 	int i;
8339 
8340 	va_start(ap, argc);
8341 
8342 	argv = calloc(argc, sizeof(char *));
8343 	if (argv == NULL)
8344 		err(1, "calloc");
8345 	for (i = 0; i < argc; i++) {
8346 		argv[i] = strdup(va_arg(ap, char *));
8347 		if (argv[i] == NULL)
8348 			err(1, "strdup");
8349 	}
8350 
8351 	va_end(ap);
8352 	return argv;
8353 }
8354 
8355 /*
8356  * Try to convert 'tog path' into a 'tog log path' command.
8357  * The user could simply have mistyped the command rather than knowingly
8358  * provided a path. So check whether argv[0] can in fact be resolved
8359  * to a path in the HEAD commit and print a special error if not.
8360  * This hack is for mpi@ <3
8361  */
8362 static const struct got_error *
8363 tog_log_with_path(int argc, char *argv[])
8364 {
8365 	const struct got_error *error = NULL, *close_err;
8366 	const struct tog_cmd *cmd = NULL;
8367 	struct got_repository *repo = NULL;
8368 	struct got_worktree *worktree = NULL;
8369 	struct got_object_id *commit_id = NULL, *id = NULL;
8370 	struct got_commit_object *commit = NULL;
8371 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8372 	char *commit_id_str = NULL, **cmd_argv = NULL;
8373 	int *pack_fds = NULL;
8374 
8375 	cwd = getcwd(NULL, 0);
8376 	if (cwd == NULL)
8377 		return got_error_from_errno("getcwd");
8378 
8379 	error = got_repo_pack_fds_open(&pack_fds);
8380 	if (error != NULL)
8381 		goto done;
8382 
8383 	error = got_worktree_open(&worktree, cwd);
8384 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8385 		goto done;
8386 
8387 	if (worktree)
8388 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8389 	else
8390 		repo_path = strdup(cwd);
8391 	if (repo_path == NULL) {
8392 		error = got_error_from_errno("strdup");
8393 		goto done;
8394 	}
8395 
8396 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8397 	if (error != NULL)
8398 		goto done;
8399 
8400 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8401 	    repo, worktree);
8402 	if (error)
8403 		goto done;
8404 
8405 	error = tog_load_refs(repo, 0);
8406 	if (error)
8407 		goto done;
8408 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8409 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8410 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8411 	if (error)
8412 		goto done;
8413 
8414 	if (worktree) {
8415 		got_worktree_close(worktree);
8416 		worktree = NULL;
8417 	}
8418 
8419 	error = got_object_open_as_commit(&commit, repo, commit_id);
8420 	if (error)
8421 		goto done;
8422 
8423 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8424 	if (error) {
8425 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8426 			goto done;
8427 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8428 		    getprogname(), argv[0]);
8429 		usage(1, 1);
8430 		/* not reached */
8431 	}
8432 
8433 	error = got_object_id_str(&commit_id_str, commit_id);
8434 	if (error)
8435 		goto done;
8436 
8437 	cmd = &tog_commands[0]; /* log */
8438 	argc = 4;
8439 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8440 	error = cmd->cmd_main(argc, cmd_argv);
8441 done:
8442 	if (repo) {
8443 		close_err = got_repo_close(repo);
8444 		if (error == NULL)
8445 			error = close_err;
8446 	}
8447 	if (commit)
8448 		got_object_commit_close(commit);
8449 	if (worktree)
8450 		got_worktree_close(worktree);
8451 	if (pack_fds) {
8452 		const struct got_error *pack_err =
8453 		    got_repo_pack_fds_close(pack_fds);
8454 		if (error == NULL)
8455 			error = pack_err;
8456 	}
8457 	free(id);
8458 	free(commit_id_str);
8459 	free(commit_id);
8460 	free(cwd);
8461 	free(repo_path);
8462 	free(in_repo_path);
8463 	if (cmd_argv) {
8464 		int i;
8465 		for (i = 0; i < argc; i++)
8466 			free(cmd_argv[i]);
8467 		free(cmd_argv);
8468 	}
8469 	tog_free_refs();
8470 	return error;
8471 }
8472 
8473 int
8474 main(int argc, char *argv[])
8475 {
8476 	const struct got_error *error = NULL;
8477 	const struct tog_cmd *cmd = NULL;
8478 	int ch, hflag = 0, Vflag = 0;
8479 	char **cmd_argv = NULL;
8480 	static const struct option longopts[] = {
8481 	    { "version", no_argument, NULL, 'V' },
8482 	    { NULL, 0, NULL, 0}
8483 	};
8484 	char *diff_algo_str = NULL;
8485 
8486 	if (!isatty(STDIN_FILENO))
8487 		errx(1, "standard input is not a tty");
8488 
8489 	setlocale(LC_CTYPE, "");
8490 
8491 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8492 		switch (ch) {
8493 		case 'h':
8494 			hflag = 1;
8495 			break;
8496 		case 'V':
8497 			Vflag = 1;
8498 			break;
8499 		default:
8500 			usage(hflag, 1);
8501 			/* NOTREACHED */
8502 		}
8503 	}
8504 
8505 	argc -= optind;
8506 	argv += optind;
8507 	optind = 1;
8508 	optreset = 1;
8509 
8510 	if (Vflag) {
8511 		got_version_print_str();
8512 		return 0;
8513 	}
8514 
8515 #ifndef PROFILE
8516 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8517 	    NULL) == -1)
8518 		err(1, "pledge");
8519 #endif
8520 
8521 	if (argc == 0) {
8522 		if (hflag)
8523 			usage(hflag, 0);
8524 		/* Build an argument vector which runs a default command. */
8525 		cmd = &tog_commands[0];
8526 		argc = 1;
8527 		cmd_argv = make_argv(argc, cmd->name);
8528 	} else {
8529 		size_t i;
8530 
8531 		/* Did the user specify a command? */
8532 		for (i = 0; i < nitems(tog_commands); i++) {
8533 			if (strncmp(tog_commands[i].name, argv[0],
8534 			    strlen(argv[0])) == 0) {
8535 				cmd = &tog_commands[i];
8536 				break;
8537 			}
8538 		}
8539 	}
8540 
8541 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8542 	if (diff_algo_str) {
8543 		if (strcasecmp(diff_algo_str, "patience") == 0)
8544 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8545 		if (strcasecmp(diff_algo_str, "myers") == 0)
8546 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8547 	}
8548 
8549 	if (cmd == NULL) {
8550 		if (argc != 1)
8551 			usage(0, 1);
8552 		/* No command specified; try log with a path */
8553 		error = tog_log_with_path(argc, argv);
8554 	} else {
8555 		if (hflag)
8556 			cmd->cmd_usage();
8557 		else
8558 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8559 	}
8560 
8561 	endwin();
8562 	putchar('\n');
8563 	if (cmd_argv) {
8564 		int i;
8565 		for (i = 0; i < argc; i++)
8566 			free(cmd_argv[i]);
8567 		free(cmd_argv);
8568 	}
8569 
8570 	if (error && error->code != GOT_ERR_CANCELLED)
8571 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8572 	return 0;
8573 }