1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 };
112 
113 enum tog_view_mode {
114 	TOG_VIEW_SPLIT_NONE,
115 	TOG_VIEW_SPLIT_VERT,
116 	TOG_VIEW_SPLIT_HRZN
117 };
118 
119 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
120 
121 #define TOG_EOF_STRING	"(END)"
122 
123 struct commit_queue_entry {
124 	TAILQ_ENTRY(commit_queue_entry) entry;
125 	struct got_object_id *id;
126 	struct got_commit_object *commit;
127 	int idx;
128 };
129 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
130 struct commit_queue {
131 	int ncommits;
132 	struct commit_queue_head head;
133 };
134 
135 struct tog_color {
136 	STAILQ_ENTRY(tog_color) entry;
137 	regex_t regex;
138 	short colorpair;
139 };
140 STAILQ_HEAD(tog_colors, tog_color);
141 
142 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
143 static struct got_reflist_object_id_map *tog_refs_idmap;
144 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
145 
146 static const struct got_error *
147 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
148     struct got_reference* re2)
149 {
150 	const char *name1 = got_ref_get_name(re1);
151 	const char *name2 = got_ref_get_name(re2);
152 	int isbackup1, isbackup2;
153 
154 	/* Sort backup refs towards the bottom of the list. */
155 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
156 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
157 	if (!isbackup1 && isbackup2) {
158 		*cmp = -1;
159 		return NULL;
160 	} else if (isbackup1 && !isbackup2) {
161 		*cmp = 1;
162 		return NULL;
163 	}
164 
165 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
166 	return NULL;
167 }
168 
169 static const struct got_error *
170 tog_load_refs(struct got_repository *repo, int sort_by_date)
171 {
172 	const struct got_error *err;
173 
174 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
175 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
176 	    repo);
177 	if (err)
178 		return err;
179 
180 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
181 	    repo);
182 }
183 
184 static void
185 tog_free_refs(void)
186 {
187 	if (tog_refs_idmap) {
188 		got_reflist_object_id_map_free(tog_refs_idmap);
189 		tog_refs_idmap = NULL;
190 	}
191 	got_ref_list_free(&tog_refs);
192 }
193 
194 static const struct got_error *
195 add_color(struct tog_colors *colors, const char *pattern,
196     int idx, short color)
197 {
198 	const struct got_error *err = NULL;
199 	struct tog_color *tc;
200 	int regerr = 0;
201 
202 	if (idx < 1 || idx > COLOR_PAIRS - 1)
203 		return NULL;
204 
205 	init_pair(idx, color, -1);
206 
207 	tc = calloc(1, sizeof(*tc));
208 	if (tc == NULL)
209 		return got_error_from_errno("calloc");
210 	regerr = regcomp(&tc->regex, pattern,
211 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
212 	if (regerr) {
213 		static char regerr_msg[512];
214 		static char err_msg[512];
215 		regerror(regerr, &tc->regex, regerr_msg,
216 		    sizeof(regerr_msg));
217 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
218 		    regerr_msg);
219 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
220 		free(tc);
221 		return err;
222 	}
223 	tc->colorpair = idx;
224 	STAILQ_INSERT_HEAD(colors, tc, entry);
225 	return NULL;
226 }
227 
228 static void
229 free_colors(struct tog_colors *colors)
230 {
231 	struct tog_color *tc;
232 
233 	while (!STAILQ_EMPTY(colors)) {
234 		tc = STAILQ_FIRST(colors);
235 		STAILQ_REMOVE_HEAD(colors, entry);
236 		regfree(&tc->regex);
237 		free(tc);
238 	}
239 }
240 
241 static struct tog_color *
242 get_color(struct tog_colors *colors, int colorpair)
243 {
244 	struct tog_color *tc = NULL;
245 
246 	STAILQ_FOREACH(tc, colors, entry) {
247 		if (tc->colorpair == colorpair)
248 			return tc;
249 	}
250 
251 	return NULL;
252 }
253 
254 static int
255 default_color_value(const char *envvar)
256 {
257 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
258 		return COLOR_MAGENTA;
259 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
260 		return COLOR_CYAN;
261 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
262 		return COLOR_YELLOW;
263 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
264 		return COLOR_GREEN;
265 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
270 		return COLOR_CYAN;
271 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
274 		return COLOR_GREEN;
275 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
276 		return COLOR_CYAN;
277 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
278 		return COLOR_YELLOW;
279 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
282 		return COLOR_MAGENTA;
283 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
284 		return COLOR_YELLOW;
285 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
286 		return COLOR_CYAN;
287 
288 	return -1;
289 }
290 
291 static int
292 get_color_value(const char *envvar)
293 {
294 	const char *val = getenv(envvar);
295 
296 	if (val == NULL)
297 		return default_color_value(envvar);
298 
299 	if (strcasecmp(val, "black") == 0)
300 		return COLOR_BLACK;
301 	if (strcasecmp(val, "red") == 0)
302 		return COLOR_RED;
303 	if (strcasecmp(val, "green") == 0)
304 		return COLOR_GREEN;
305 	if (strcasecmp(val, "yellow") == 0)
306 		return COLOR_YELLOW;
307 	if (strcasecmp(val, "blue") == 0)
308 		return COLOR_BLUE;
309 	if (strcasecmp(val, "magenta") == 0)
310 		return COLOR_MAGENTA;
311 	if (strcasecmp(val, "cyan") == 0)
312 		return COLOR_CYAN;
313 	if (strcasecmp(val, "white") == 0)
314 		return COLOR_WHITE;
315 	if (strcasecmp(val, "default") == 0)
316 		return -1;
317 
318 	return default_color_value(envvar);
319 }
320 
321 struct tog_diff_view_state {
322 	struct got_object_id *id1, *id2;
323 	const char *label1, *label2;
324 	FILE *f, *f1, *f2;
325 	int fd1, fd2;
326 	int lineno;
327 	int first_displayed_line;
328 	int last_displayed_line;
329 	int eof;
330 	int diff_context;
331 	int ignore_whitespace;
332 	int force_text_diff;
333 	struct got_repository *repo;
334 	struct got_diff_line *lines;
335 	size_t nlines;
336 	int matched_line;
337 	int selected_line;
338 
339 	/* passed from log or blame view; may be NULL */
340 	struct tog_view *parent_view;
341 };
342 
343 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
344 static volatile sig_atomic_t tog_thread_error;
345 
346 struct tog_log_thread_args {
347 	pthread_cond_t need_commits;
348 	pthread_cond_t commit_loaded;
349 	int commits_needed;
350 	int load_all;
351 	struct got_commit_graph *graph;
352 	struct commit_queue *commits;
353 	const char *in_repo_path;
354 	struct got_object_id *start_id;
355 	struct got_repository *repo;
356 	int *pack_fds;
357 	int log_complete;
358 	sig_atomic_t *quit;
359 	struct commit_queue_entry **first_displayed_entry;
360 	struct commit_queue_entry **selected_entry;
361 	int *searching;
362 	int *search_next_done;
363 	regex_t *regex;
364 };
365 
366 struct tog_log_view_state {
367 	struct commit_queue commits;
368 	struct commit_queue_entry *first_displayed_entry;
369 	struct commit_queue_entry *last_displayed_entry;
370 	struct commit_queue_entry *selected_entry;
371 	int selected;
372 	char *in_repo_path;
373 	char *head_ref_name;
374 	int log_branches;
375 	struct got_repository *repo;
376 	struct got_object_id *start_id;
377 	sig_atomic_t quit;
378 	pthread_t thread;
379 	struct tog_log_thread_args thread_args;
380 	struct commit_queue_entry *matched_entry;
381 	struct commit_queue_entry *search_entry;
382 	struct tog_colors colors;
383 	int use_committer;
384 };
385 
386 #define TOG_COLOR_DIFF_MINUS		1
387 #define TOG_COLOR_DIFF_PLUS		2
388 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
389 #define TOG_COLOR_DIFF_META		4
390 #define TOG_COLOR_TREE_SUBMODULE	5
391 #define TOG_COLOR_TREE_SYMLINK		6
392 #define TOG_COLOR_TREE_DIRECTORY	7
393 #define TOG_COLOR_TREE_EXECUTABLE	8
394 #define TOG_COLOR_COMMIT		9
395 #define TOG_COLOR_AUTHOR		10
396 #define TOG_COLOR_DATE			11
397 #define TOG_COLOR_REFS_HEADS		12
398 #define TOG_COLOR_REFS_TAGS		13
399 #define TOG_COLOR_REFS_REMOTES		14
400 #define TOG_COLOR_REFS_BACKUP		15
401 
402 struct tog_blame_cb_args {
403 	struct tog_blame_line *lines; /* one per line */
404 	int nlines;
405 
406 	struct tog_view *view;
407 	struct got_object_id *commit_id;
408 	int *quit;
409 };
410 
411 struct tog_blame_thread_args {
412 	const char *path;
413 	struct got_repository *repo;
414 	struct tog_blame_cb_args *cb_args;
415 	int *complete;
416 	got_cancel_cb cancel_cb;
417 	void *cancel_arg;
418 };
419 
420 struct tog_blame {
421 	FILE *f;
422 	off_t filesize;
423 	struct tog_blame_line *lines;
424 	int nlines;
425 	off_t *line_offsets;
426 	pthread_t thread;
427 	struct tog_blame_thread_args thread_args;
428 	struct tog_blame_cb_args cb_args;
429 	const char *path;
430 	int *pack_fds;
431 };
432 
433 struct tog_blame_view_state {
434 	int first_displayed_line;
435 	int last_displayed_line;
436 	int selected_line;
437 	int last_diffed_line;
438 	int blame_complete;
439 	int eof;
440 	int done;
441 	struct got_object_id_queue blamed_commits;
442 	struct got_object_qid *blamed_commit;
443 	char *path;
444 	struct got_repository *repo;
445 	struct got_object_id *commit_id;
446 	struct got_object_id *id_to_log;
447 	struct tog_blame blame;
448 	int matched_line;
449 	struct tog_colors colors;
450 };
451 
452 struct tog_parent_tree {
453 	TAILQ_ENTRY(tog_parent_tree) entry;
454 	struct got_tree_object *tree;
455 	struct got_tree_entry *first_displayed_entry;
456 	struct got_tree_entry *selected_entry;
457 	int selected;
458 };
459 
460 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
461 
462 struct tog_tree_view_state {
463 	char *tree_label;
464 	struct got_object_id *commit_id;/* commit which this tree belongs to */
465 	struct got_tree_object *root;	/* the commit's root tree entry */
466 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
467 	struct got_tree_entry *first_displayed_entry;
468 	struct got_tree_entry *last_displayed_entry;
469 	struct got_tree_entry *selected_entry;
470 	int ndisplayed, selected, show_ids;
471 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
472 	char *head_ref_name;
473 	struct got_repository *repo;
474 	struct got_tree_entry *matched_entry;
475 	struct tog_colors colors;
476 };
477 
478 struct tog_reflist_entry {
479 	TAILQ_ENTRY(tog_reflist_entry) entry;
480 	struct got_reference *ref;
481 	int idx;
482 };
483 
484 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
485 
486 struct tog_ref_view_state {
487 	struct tog_reflist_head refs;
488 	struct tog_reflist_entry *first_displayed_entry;
489 	struct tog_reflist_entry *last_displayed_entry;
490 	struct tog_reflist_entry *selected_entry;
491 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
492 	struct got_repository *repo;
493 	struct tog_reflist_entry *matched_entry;
494 	struct tog_colors colors;
495 };
496 
497 /*
498  * We implement two types of views: parent views and child views.
499  *
500  * The 'Tab' key switches focus between a parent view and its child view.
501  * Child views are shown side-by-side to their parent view, provided
502  * there is enough screen estate.
503  *
504  * When a new view is opened from within a parent view, this new view
505  * becomes a child view of the parent view, replacing any existing child.
506  *
507  * When a new view is opened from within a child view, this new view
508  * becomes a parent view which will obscure the views below until the
509  * user quits the new parent view by typing 'q'.
510  *
511  * This list of views contains parent views only.
512  * Child views are only pointed to by their parent view.
513  */
514 TAILQ_HEAD(tog_view_list_head, tog_view);
515 
516 struct tog_view {
517 	TAILQ_ENTRY(tog_view) entry;
518 	WINDOW *window;
519 	PANEL *panel;
520 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
521 	int resized_y, resized_x; /* begin_y/x based on user resizing */
522 	int maxx, x; /* max column and current start column */
523 	int lines, cols; /* copies of LINES and COLS */
524 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
525 	int gline, hiline; /* navigate to and highlight this nG line */
526 	int ch, count; /* current keymap and count prefix */
527 	int resized; /* set when in a resize event */
528 	int focussed; /* Only set on one parent or child view at a time. */
529 	int dying;
530 	struct tog_view *parent;
531 	struct tog_view *child;
532 
533 	/*
534 	 * This flag is initially set on parent views when a new child view
535 	 * is created. It gets toggled when the 'Tab' key switches focus
536 	 * between parent and child.
537 	 * The flag indicates whether focus should be passed on to our child
538 	 * view if this parent view gets picked for focus after another parent
539 	 * view was closed. This prevents child views from losing focus in such
540 	 * situations.
541 	 */
542 	int focus_child;
543 
544 	enum tog_view_mode mode;
545 	/* type-specific state */
546 	enum tog_view_type type;
547 	union {
548 		struct tog_diff_view_state diff;
549 		struct tog_log_view_state log;
550 		struct tog_blame_view_state blame;
551 		struct tog_tree_view_state tree;
552 		struct tog_ref_view_state ref;
553 	} state;
554 
555 	const struct got_error *(*show)(struct tog_view *);
556 	const struct got_error *(*input)(struct tog_view **,
557 	    struct tog_view *, int);
558 	const struct got_error *(*reset)(struct tog_view *);
559 	const struct got_error *(*resize)(struct tog_view *, int);
560 	const struct got_error *(*close)(struct tog_view *);
561 
562 	const struct got_error *(*search_start)(struct tog_view *);
563 	const struct got_error *(*search_next)(struct tog_view *);
564 	int search_started;
565 	int searching;
566 #define TOG_SEARCH_FORWARD	1
567 #define TOG_SEARCH_BACKWARD	2
568 	int search_next_done;
569 #define TOG_SEARCH_HAVE_MORE	1
570 #define TOG_SEARCH_NO_MORE	2
571 #define TOG_SEARCH_HAVE_NONE	3
572 	regex_t regex;
573 	regmatch_t regmatch;
574 };
575 
576 static const struct got_error *open_diff_view(struct tog_view *,
577     struct got_object_id *, struct got_object_id *,
578     const char *, const char *, int, int, int, struct tog_view *,
579     struct got_repository *);
580 static const struct got_error *show_diff_view(struct tog_view *);
581 static const struct got_error *input_diff_view(struct tog_view **,
582     struct tog_view *, int);
583 static const struct got_error *reset_diff_view(struct tog_view *);
584 static const struct got_error* close_diff_view(struct tog_view *);
585 static const struct got_error *search_start_diff_view(struct tog_view *);
586 static const struct got_error *search_next_diff_view(struct tog_view *);
587 
588 static const struct got_error *open_log_view(struct tog_view *,
589     struct got_object_id *, struct got_repository *,
590     const char *, const char *, int);
591 static const struct got_error * show_log_view(struct tog_view *);
592 static const struct got_error *input_log_view(struct tog_view **,
593     struct tog_view *, int);
594 static const struct got_error *resize_log_view(struct tog_view *, int);
595 static const struct got_error *close_log_view(struct tog_view *);
596 static const struct got_error *search_start_log_view(struct tog_view *);
597 static const struct got_error *search_next_log_view(struct tog_view *);
598 
599 static const struct got_error *open_blame_view(struct tog_view *, char *,
600     struct got_object_id *, struct got_repository *);
601 static const struct got_error *show_blame_view(struct tog_view *);
602 static const struct got_error *input_blame_view(struct tog_view **,
603     struct tog_view *, int);
604 static const struct got_error *reset_blame_view(struct tog_view *);
605 static const struct got_error *close_blame_view(struct tog_view *);
606 static const struct got_error *search_start_blame_view(struct tog_view *);
607 static const struct got_error *search_next_blame_view(struct tog_view *);
608 
609 static const struct got_error *open_tree_view(struct tog_view *,
610     struct got_object_id *, const char *, struct got_repository *);
611 static const struct got_error *show_tree_view(struct tog_view *);
612 static const struct got_error *input_tree_view(struct tog_view **,
613     struct tog_view *, int);
614 static const struct got_error *close_tree_view(struct tog_view *);
615 static const struct got_error *search_start_tree_view(struct tog_view *);
616 static const struct got_error *search_next_tree_view(struct tog_view *);
617 
618 static const struct got_error *open_ref_view(struct tog_view *,
619     struct got_repository *);
620 static const struct got_error *show_ref_view(struct tog_view *);
621 static const struct got_error *input_ref_view(struct tog_view **,
622     struct tog_view *, int);
623 static const struct got_error *close_ref_view(struct tog_view *);
624 static const struct got_error *search_start_ref_view(struct tog_view *);
625 static const struct got_error *search_next_ref_view(struct tog_view *);
626 
627 static volatile sig_atomic_t tog_sigwinch_received;
628 static volatile sig_atomic_t tog_sigpipe_received;
629 static volatile sig_atomic_t tog_sigcont_received;
630 static volatile sig_atomic_t tog_sigint_received;
631 static volatile sig_atomic_t tog_sigterm_received;
632 
633 static void
634 tog_sigwinch(int signo)
635 {
636 	tog_sigwinch_received = 1;
637 }
638 
639 static void
640 tog_sigpipe(int signo)
641 {
642 	tog_sigpipe_received = 1;
643 }
644 
645 static void
646 tog_sigcont(int signo)
647 {
648 	tog_sigcont_received = 1;
649 }
650 
651 static void
652 tog_sigint(int signo)
653 {
654 	tog_sigint_received = 1;
655 }
656 
657 static void
658 tog_sigterm(int signo)
659 {
660 	tog_sigterm_received = 1;
661 }
662 
663 static int
664 tog_fatal_signal_received(void)
665 {
666 	return (tog_sigpipe_received ||
667 	    tog_sigint_received || tog_sigint_received);
668 }
669 
670 static const struct got_error *
671 view_close(struct tog_view *view)
672 {
673 	const struct got_error *err = NULL, *child_err = NULL;
674 
675 	if (view->child) {
676 		child_err = view_close(view->child);
677 		view->child = NULL;
678 	}
679 	if (view->close)
680 		err = view->close(view);
681 	if (view->panel)
682 		del_panel(view->panel);
683 	if (view->window)
684 		delwin(view->window);
685 	free(view);
686 	return err ? err : child_err;
687 }
688 
689 static struct tog_view *
690 view_open(int nlines, int ncols, int begin_y, int begin_x,
691     enum tog_view_type type)
692 {
693 	struct tog_view *view = calloc(1, sizeof(*view));
694 
695 	if (view == NULL)
696 		return NULL;
697 
698 	view->type = type;
699 	view->lines = LINES;
700 	view->cols = COLS;
701 	view->nlines = nlines ? nlines : LINES - begin_y;
702 	view->ncols = ncols ? ncols : COLS - begin_x;
703 	view->begin_y = begin_y;
704 	view->begin_x = begin_x;
705 	view->window = newwin(nlines, ncols, begin_y, begin_x);
706 	if (view->window == NULL) {
707 		view_close(view);
708 		return NULL;
709 	}
710 	view->panel = new_panel(view->window);
711 	if (view->panel == NULL ||
712 	    set_panel_userptr(view->panel, view) != OK) {
713 		view_close(view);
714 		return NULL;
715 	}
716 
717 	keypad(view->window, TRUE);
718 	return view;
719 }
720 
721 static int
722 view_split_begin_x(int begin_x)
723 {
724 	if (begin_x > 0 || COLS < 120)
725 		return 0;
726 	return (COLS - MAX(COLS / 2, 80));
727 }
728 
729 /* XXX Stub till we decide what to do. */
730 static int
731 view_split_begin_y(int lines)
732 {
733 	return lines * HSPLIT_SCALE;
734 }
735 
736 static const struct got_error *view_resize(struct tog_view *);
737 
738 static const struct got_error *
739 view_splitscreen(struct tog_view *view)
740 {
741 	const struct got_error *err = NULL;
742 
743 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
744 		if (view->resized_y && view->resized_y < view->lines)
745 			view->begin_y = view->resized_y;
746 		else
747 			view->begin_y = view_split_begin_y(view->nlines);
748 		view->begin_x = 0;
749 	} else if (!view->resized) {
750 		if (view->resized_x && view->resized_x < view->cols - 1 &&
751 		    view->cols > 119)
752 			view->begin_x = view->resized_x;
753 		else
754 			view->begin_x = view_split_begin_x(0);
755 		view->begin_y = 0;
756 	}
757 	view->nlines = LINES - view->begin_y;
758 	view->ncols = COLS - view->begin_x;
759 	view->lines = LINES;
760 	view->cols = COLS;
761 	err = view_resize(view);
762 	if (err)
763 		return err;
764 
765 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
766 		view->parent->nlines = view->begin_y;
767 
768 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
769 		return got_error_from_errno("mvwin");
770 
771 	return NULL;
772 }
773 
774 static const struct got_error *
775 view_fullscreen(struct tog_view *view)
776 {
777 	const struct got_error *err = NULL;
778 
779 	view->begin_x = 0;
780 	view->begin_y = view->resized ? view->begin_y : 0;
781 	view->nlines = view->resized ? view->nlines : LINES;
782 	view->ncols = COLS;
783 	view->lines = LINES;
784 	view->cols = COLS;
785 	err = view_resize(view);
786 	if (err)
787 		return err;
788 
789 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
790 		return got_error_from_errno("mvwin");
791 
792 	return NULL;
793 }
794 
795 static int
796 view_is_parent_view(struct tog_view *view)
797 {
798 	return view->parent == NULL;
799 }
800 
801 static int
802 view_is_splitscreen(struct tog_view *view)
803 {
804 	return view->begin_x > 0 || view->begin_y > 0;
805 }
806 
807 static int
808 view_is_fullscreen(struct tog_view *view)
809 {
810 	return view->nlines == LINES && view->ncols == COLS;
811 }
812 
813 static int
814 view_is_hsplit_top(struct tog_view *view)
815 {
816 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
817 	    view_is_splitscreen(view->child);
818 }
819 
820 static void
821 view_border(struct tog_view *view)
822 {
823 	PANEL *panel;
824 	const struct tog_view *view_above;
825 
826 	if (view->parent)
827 		return view_border(view->parent);
828 
829 	panel = panel_above(view->panel);
830 	if (panel == NULL)
831 		return;
832 
833 	view_above = panel_userptr(panel);
834 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
835 		mvwhline(view->window, view_above->begin_y - 1,
836 		    view->begin_x, got_locale_is_utf8() ?
837 		    ACS_HLINE : '-', view->ncols);
838 	else
839 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
840 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
841 }
842 
843 static const struct got_error *view_init_hsplit(struct tog_view *, int);
844 static const struct got_error *request_log_commits(struct tog_view *);
845 static const struct got_error *offset_selection_down(struct tog_view *);
846 static void offset_selection_up(struct tog_view *);
847 static void view_get_split(struct tog_view *, int *, int *);
848 
849 static const struct got_error *
850 view_resize(struct tog_view *view)
851 {
852 	const struct got_error	*err = NULL;
853 	int			 dif, nlines, ncols;
854 
855 	dif = LINES - view->lines;  /* line difference */
856 
857 	if (view->lines > LINES)
858 		nlines = view->nlines - (view->lines - LINES);
859 	else
860 		nlines = view->nlines + (LINES - view->lines);
861 	if (view->cols > COLS)
862 		ncols = view->ncols - (view->cols - COLS);
863 	else
864 		ncols = view->ncols + (COLS - view->cols);
865 
866 	if (view->child) {
867 		int hs = view->child->begin_y;
868 
869 		if (!view_is_fullscreen(view))
870 			view->child->begin_x = view_split_begin_x(view->begin_x);
871 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
872 		    view->child->begin_x == 0) {
873 			ncols = COLS;
874 
875 			view_fullscreen(view->child);
876 			if (view->child->focussed)
877 				show_panel(view->child->panel);
878 			else
879 				show_panel(view->panel);
880 		} else {
881 			ncols = view->child->begin_x;
882 
883 			view_splitscreen(view->child);
884 			show_panel(view->child->panel);
885 		}
886 		/*
887 		 * XXX This is ugly and needs to be moved into the above
888 		 * logic but "works" for now and my attempts at moving it
889 		 * break either 'tab' or 'F' key maps in horizontal splits.
890 		 */
891 		if (hs) {
892 			err = view_splitscreen(view->child);
893 			if (err)
894 				return err;
895 			if (dif < 0) { /* top split decreased */
896 				err = offset_selection_down(view);
897 				if (err)
898 					return err;
899 			}
900 			view_border(view);
901 			update_panels();
902 			doupdate();
903 			show_panel(view->child->panel);
904 			nlines = view->nlines;
905 		}
906 	} else if (view->parent == NULL)
907 		ncols = COLS;
908 
909 	if (view->resize && dif > 0) {
910 		err = view->resize(view, dif);
911 		if (err)
912 			return err;
913 	}
914 
915 	if (wresize(view->window, nlines, ncols) == ERR)
916 		return got_error_from_errno("wresize");
917 	if (replace_panel(view->panel, view->window) == ERR)
918 		return got_error_from_errno("replace_panel");
919 	wclear(view->window);
920 
921 	view->nlines = nlines;
922 	view->ncols = ncols;
923 	view->lines = LINES;
924 	view->cols = COLS;
925 
926 	return NULL;
927 }
928 
929 static const struct got_error *
930 resize_log_view(struct tog_view *view, int increase)
931 {
932 	struct tog_log_view_state	*s = &view->state.log;
933 	const struct got_error		*err = NULL;
934 	int				 n = 0;
935 
936 	if (s->selected_entry)
937 		n = s->selected_entry->idx + view->lines - s->selected;
938 
939 	/*
940 	 * Request commits to account for the increased
941 	 * height so we have enough to populate the view.
942 	 */
943 	if (s->commits.ncommits < n) {
944 		view->nscrolled = n - s->commits.ncommits + increase + 1;
945 		err = request_log_commits(view);
946 	}
947 
948 	return err;
949 }
950 
951 static void
952 view_adjust_offset(struct tog_view *view, int n)
953 {
954 	if (n == 0)
955 		return;
956 
957 	if (view->parent && view->parent->offset) {
958 		if (view->parent->offset + n >= 0)
959 			view->parent->offset += n;
960 		else
961 			view->parent->offset = 0;
962 	} else if (view->offset) {
963 		if (view->offset - n >= 0)
964 			view->offset -= n;
965 		else
966 			view->offset = 0;
967 	}
968 }
969 
970 static const struct got_error *
971 view_resize_split(struct tog_view *view, int resize)
972 {
973 	const struct got_error	*err = NULL;
974 	struct tog_view		*v = NULL;
975 
976 	if (view->parent)
977 		v = view->parent;
978 	else
979 		v = view;
980 
981 	if (!v->child || !view_is_splitscreen(v->child))
982 		return NULL;
983 
984 	v->resized = v->child->resized = resize;  /* lock for resize event */
985 
986 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
987 		if (v->child->resized_y)
988 			v->child->begin_y = v->child->resized_y;
989 		if (view->parent)
990 			v->child->begin_y -= resize;
991 		else
992 			v->child->begin_y += resize;
993 		if (v->child->begin_y < 3) {
994 			view->count = 0;
995 			v->child->begin_y = 3;
996 		} else if (v->child->begin_y > LINES - 1) {
997 			view->count = 0;
998 			v->child->begin_y = LINES - 1;
999 		}
1000 		v->ncols = COLS;
1001 		v->child->ncols = COLS;
1002 		view_adjust_offset(view, resize);
1003 		err = view_init_hsplit(v, v->child->begin_y);
1004 		if (err)
1005 			return err;
1006 		v->child->resized_y = v->child->begin_y;
1007 	} else {
1008 		if (v->child->resized_x)
1009 			v->child->begin_x = v->child->resized_x;
1010 		if (view->parent)
1011 			v->child->begin_x -= resize;
1012 		else
1013 			v->child->begin_x += resize;
1014 		if (v->child->begin_x < 11) {
1015 			view->count = 0;
1016 			v->child->begin_x = 11;
1017 		} else if (v->child->begin_x > COLS - 1) {
1018 			view->count = 0;
1019 			v->child->begin_x = COLS - 1;
1020 		}
1021 		v->child->resized_x = v->child->begin_x;
1022 	}
1023 
1024 	v->child->mode = v->mode;
1025 	v->child->nlines = v->lines - v->child->begin_y;
1026 	v->child->ncols = v->cols - v->child->begin_x;
1027 	v->focus_child = 1;
1028 
1029 	err = view_fullscreen(v);
1030 	if (err)
1031 		return err;
1032 	err = view_splitscreen(v->child);
1033 	if (err)
1034 		return err;
1035 
1036 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1037 		err = offset_selection_down(v->child);
1038 		if (err)
1039 			return err;
1040 	}
1041 
1042 	if (v->resize)
1043 		err = v->resize(v, 0);
1044 	else if (v->child->resize)
1045 		err = v->child->resize(v->child, 0);
1046 
1047 	v->resized = v->child->resized = 0;
1048 
1049 	return err;
1050 }
1051 
1052 static void
1053 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1054 {
1055 	struct tog_view *v = src->child ? src->child : src;
1056 
1057 	dst->resized_x = v->resized_x;
1058 	dst->resized_y = v->resized_y;
1059 }
1060 
1061 static const struct got_error *
1062 view_close_child(struct tog_view *view)
1063 {
1064 	const struct got_error *err = NULL;
1065 
1066 	if (view->child == NULL)
1067 		return NULL;
1068 
1069 	err = view_close(view->child);
1070 	view->child = NULL;
1071 	return err;
1072 }
1073 
1074 static const struct got_error *
1075 view_set_child(struct tog_view *view, struct tog_view *child)
1076 {
1077 	const struct got_error *err = NULL;
1078 
1079 	view->child = child;
1080 	child->parent = view;
1081 
1082 	err = view_resize(view);
1083 	if (err)
1084 		return err;
1085 
1086 	if (view->child->resized_x || view->child->resized_y)
1087 		err = view_resize_split(view, 0);
1088 
1089 	return err;
1090 }
1091 
1092 static const struct got_error *view_dispatch_request(struct tog_view **,
1093     struct tog_view *, enum tog_view_type, int, int);
1094 
1095 static const struct got_error *
1096 view_request_new(struct tog_view **requested, struct tog_view *view,
1097     enum tog_view_type request)
1098 {
1099 	struct tog_view		*new_view = NULL;
1100 	const struct got_error	*err;
1101 	int			 y = 0, x = 0;
1102 
1103 	*requested = NULL;
1104 
1105 	if (view_is_parent_view(view))
1106 		view_get_split(view, &y, &x);
1107 
1108 	err = view_dispatch_request(&new_view, view, request, y, x);
1109 	if (err)
1110 		return err;
1111 
1112 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1113 		err = view_init_hsplit(view, y);
1114 		if (err)
1115 			return err;
1116 	}
1117 
1118 	view->focussed = 0;
1119 	new_view->focussed = 1;
1120 	new_view->mode = view->mode;
1121 	new_view->nlines = view->lines - y;
1122 
1123 	if (view_is_parent_view(view)) {
1124 		view_transfer_size(new_view, view);
1125 		err = view_close_child(view);
1126 		if (err)
1127 			return err;
1128 		err = view_set_child(view, new_view);
1129 		if (err)
1130 			return err;
1131 		view->focus_child = 1;
1132 	} else
1133 		*requested = new_view;
1134 
1135 	return NULL;
1136 }
1137 
1138 static void
1139 tog_resizeterm(void)
1140 {
1141 	int cols, lines;
1142 	struct winsize size;
1143 
1144 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1145 		cols = 80;     /* Default */
1146 		lines = 24;
1147 	} else {
1148 		cols = size.ws_col;
1149 		lines = size.ws_row;
1150 	}
1151 	resize_term(lines, cols);
1152 }
1153 
1154 static const struct got_error *
1155 view_search_start(struct tog_view *view)
1156 {
1157 	const struct got_error *err = NULL;
1158 	struct tog_view *v = view;
1159 	char pattern[1024];
1160 	int ret;
1161 
1162 	if (view->search_started) {
1163 		regfree(&view->regex);
1164 		view->searching = 0;
1165 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1166 	}
1167 	view->search_started = 0;
1168 
1169 	if (view->nlines < 1)
1170 		return NULL;
1171 
1172 	if (view_is_hsplit_top(view))
1173 		v = view->child;
1174 
1175 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1176 	wclrtoeol(v->window);
1177 
1178 	nodelay(view->window, FALSE);  /* block for search term input */
1179 	nocbreak();
1180 	echo();
1181 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1182 	wrefresh(v->window);
1183 	cbreak();
1184 	noecho();
1185 	nodelay(view->window, TRUE);
1186 	if (ret == ERR)
1187 		return NULL;
1188 
1189 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1190 		err = view->search_start(view);
1191 		if (err) {
1192 			regfree(&view->regex);
1193 			return err;
1194 		}
1195 		view->search_started = 1;
1196 		view->searching = TOG_SEARCH_FORWARD;
1197 		view->search_next_done = 0;
1198 		view->search_next(view);
1199 	}
1200 
1201 	return NULL;
1202 }
1203 
1204 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1205 static const struct got_error *
1206 switch_split(struct tog_view *view)
1207 {
1208 	const struct got_error	*err = NULL;
1209 	struct tog_view		*v = NULL;
1210 
1211 	if (view->parent)
1212 		v = view->parent;
1213 	else
1214 		v = view;
1215 
1216 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1217 		v->mode = TOG_VIEW_SPLIT_VERT;
1218 	else
1219 		v->mode = TOG_VIEW_SPLIT_HRZN;
1220 
1221 	if (!v->child)
1222 		return NULL;
1223 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1224 		v->mode = TOG_VIEW_SPLIT_NONE;
1225 
1226 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1227 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1228 		v->child->begin_y = v->child->resized_y;
1229 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1230 		v->child->begin_x = v->child->resized_x;
1231 
1232 
1233 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1234 		v->ncols = COLS;
1235 		v->child->ncols = COLS;
1236 		v->child->nscrolled = LINES - v->child->nlines;
1237 
1238 		err = view_init_hsplit(v, v->child->begin_y);
1239 		if (err)
1240 			return err;
1241 	}
1242 	v->child->mode = v->mode;
1243 	v->child->nlines = v->lines - v->child->begin_y;
1244 	v->focus_child = 1;
1245 
1246 	err = view_fullscreen(v);
1247 	if (err)
1248 		return err;
1249 	err = view_splitscreen(v->child);
1250 	if (err)
1251 		return err;
1252 
1253 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1254 		v->mode = TOG_VIEW_SPLIT_VERT;
1255 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1256 		err = offset_selection_down(v);
1257 		if (err)
1258 			return err;
1259 		err = offset_selection_down(v->child);
1260 		if (err)
1261 			return err;
1262 	} else {
1263 		offset_selection_up(v);
1264 		offset_selection_up(v->child);
1265 	}
1266 	if (v->resize)
1267 		err = v->resize(v, 0);
1268 	else if (v->child->resize)
1269 		err = v->child->resize(v->child, 0);
1270 
1271 	return err;
1272 }
1273 
1274 /*
1275  * Compute view->count from numeric input. Assign total to view->count and
1276  * return first non-numeric key entered.
1277  */
1278 static int
1279 get_compound_key(struct tog_view *view, int c)
1280 {
1281 	struct tog_view	*v = view;
1282 	int		 x, n = 0;
1283 
1284 	if (view_is_hsplit_top(view))
1285 		v = view->child;
1286 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1287 		v = view->parent;
1288 
1289 	view->count = 0;
1290 	cbreak();  /* block for input */
1291 	nodelay(view->window, FALSE);
1292 	wmove(v->window, v->nlines - 1, 0);
1293 	wclrtoeol(v->window);
1294 	waddch(v->window, ':');
1295 
1296 	do {
1297 		x = getcurx(v->window);
1298 		if (x != ERR && x < view->ncols) {
1299 			waddch(v->window, c);
1300 			wrefresh(v->window);
1301 		}
1302 
1303 		/*
1304 		 * Don't overflow. Max valid request should be the greatest
1305 		 * between the longest and total lines; cap at 10 million.
1306 		 */
1307 		if (n >= 9999999)
1308 			n = 9999999;
1309 		else
1310 			n = n * 10 + (c - '0');
1311 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1312 
1313 	if (c == 'G' || c == 'g') {	/* nG key map */
1314 		view->gline = view->hiline = n;
1315 		n = 0;
1316 		c = 0;
1317 	}
1318 
1319 	/* Massage excessive or inapplicable values at the input handler. */
1320 	view->count = n;
1321 
1322 	return c;
1323 }
1324 
1325 static const struct got_error *
1326 view_input(struct tog_view **new, int *done, struct tog_view *view,
1327     struct tog_view_list_head *views)
1328 {
1329 	const struct got_error *err = NULL;
1330 	struct tog_view *v;
1331 	int ch, errcode;
1332 
1333 	*new = NULL;
1334 
1335 	/* Clear "no matches" indicator. */
1336 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1337 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1338 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1339 		view->count = 0;
1340 	}
1341 
1342 	if (view->searching && !view->search_next_done) {
1343 		errcode = pthread_mutex_unlock(&tog_mutex);
1344 		if (errcode)
1345 			return got_error_set_errno(errcode,
1346 			    "pthread_mutex_unlock");
1347 		sched_yield();
1348 		errcode = pthread_mutex_lock(&tog_mutex);
1349 		if (errcode)
1350 			return got_error_set_errno(errcode,
1351 			    "pthread_mutex_lock");
1352 		view->search_next(view);
1353 		return NULL;
1354 	}
1355 
1356 	/* Allow threads to make progress while we are waiting for input. */
1357 	errcode = pthread_mutex_unlock(&tog_mutex);
1358 	if (errcode)
1359 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1360 	/* If we have an unfinished count, let C-g or backspace abort. */
1361 	if (view->count && --view->count) {
1362 		cbreak();
1363 		nodelay(view->window, TRUE);
1364 		ch = wgetch(view->window);
1365 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1366 			view->count = 0;
1367 		else
1368 			ch = view->ch;
1369 	} else {
1370 		ch = wgetch(view->window);
1371 		if (ch >= '1' && ch  <= '9')
1372 			view->ch = ch = get_compound_key(view, ch);
1373 	}
1374 	if (view->hiline && ch != ERR && ch != 0)
1375 		view->hiline = 0;  /* key pressed, clear line highlight */
1376 	nodelay(view->window, TRUE);
1377 	errcode = pthread_mutex_lock(&tog_mutex);
1378 	if (errcode)
1379 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1380 
1381 	if (tog_sigwinch_received || tog_sigcont_received) {
1382 		tog_resizeterm();
1383 		tog_sigwinch_received = 0;
1384 		tog_sigcont_received = 0;
1385 		TAILQ_FOREACH(v, views, entry) {
1386 			err = view_resize(v);
1387 			if (err)
1388 				return err;
1389 			err = v->input(new, v, KEY_RESIZE);
1390 			if (err)
1391 				return err;
1392 			if (v->child) {
1393 				err = view_resize(v->child);
1394 				if (err)
1395 					return err;
1396 				err = v->child->input(new, v->child,
1397 				    KEY_RESIZE);
1398 				if (err)
1399 					return err;
1400 				if (v->child->resized_x || v->child->resized_y) {
1401 					err = view_resize_split(v, 0);
1402 					if (err)
1403 						return err;
1404 				}
1405 			}
1406 		}
1407 	}
1408 
1409 	switch (ch) {
1410 	case '\t':
1411 		view->count = 0;
1412 		if (view->child) {
1413 			view->focussed = 0;
1414 			view->child->focussed = 1;
1415 			view->focus_child = 1;
1416 		} else if (view->parent) {
1417 			view->focussed = 0;
1418 			view->parent->focussed = 1;
1419 			view->parent->focus_child = 0;
1420 			if (!view_is_splitscreen(view)) {
1421 				if (view->parent->resize) {
1422 					err = view->parent->resize(view->parent,
1423 					    0);
1424 					if (err)
1425 						return err;
1426 				}
1427 				offset_selection_up(view->parent);
1428 				err = view_fullscreen(view->parent);
1429 				if (err)
1430 					return err;
1431 			}
1432 		}
1433 		break;
1434 	case 'q':
1435 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1436 			if (view->parent->resize) {
1437 				/* might need more commits to fill fullscreen */
1438 				err = view->parent->resize(view->parent, 0);
1439 				if (err)
1440 					break;
1441 			}
1442 			offset_selection_up(view->parent);
1443 		}
1444 		err = view->input(new, view, ch);
1445 		view->dying = 1;
1446 		break;
1447 	case 'Q':
1448 		*done = 1;
1449 		break;
1450 	case 'F':
1451 		view->count = 0;
1452 		if (view_is_parent_view(view)) {
1453 			if (view->child == NULL)
1454 				break;
1455 			if (view_is_splitscreen(view->child)) {
1456 				view->focussed = 0;
1457 				view->child->focussed = 1;
1458 				err = view_fullscreen(view->child);
1459 			} else {
1460 				err = view_splitscreen(view->child);
1461 				if (!err)
1462 					err = view_resize_split(view, 0);
1463 			}
1464 			if (err)
1465 				break;
1466 			err = view->child->input(new, view->child,
1467 			    KEY_RESIZE);
1468 		} else {
1469 			if (view_is_splitscreen(view)) {
1470 				view->parent->focussed = 0;
1471 				view->focussed = 1;
1472 				err = view_fullscreen(view);
1473 			} else {
1474 				err = view_splitscreen(view);
1475 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1476 					err = view_resize(view->parent);
1477 				if (!err)
1478 					err = view_resize_split(view, 0);
1479 			}
1480 			if (err)
1481 				break;
1482 			err = view->input(new, view, KEY_RESIZE);
1483 		}
1484 		if (err)
1485 			break;
1486 		if (view->resize) {
1487 			err = view->resize(view, 0);
1488 			if (err)
1489 				break;
1490 		}
1491 		if (view->parent)
1492 			err = offset_selection_down(view->parent);
1493 		if (!err)
1494 			err = offset_selection_down(view);
1495 		break;
1496 	case 'S':
1497 		view->count = 0;
1498 		err = switch_split(view);
1499 		break;
1500 	case '-':
1501 		err = view_resize_split(view, -1);
1502 		break;
1503 	case '+':
1504 		err = view_resize_split(view, 1);
1505 		break;
1506 	case KEY_RESIZE:
1507 		break;
1508 	case '/':
1509 		view->count = 0;
1510 		if (view->search_start)
1511 			view_search_start(view);
1512 		else
1513 			err = view->input(new, view, ch);
1514 		break;
1515 	case 'N':
1516 	case 'n':
1517 		if (view->search_started && view->search_next) {
1518 			view->searching = (ch == 'n' ?
1519 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1520 			view->search_next_done = 0;
1521 			view->search_next(view);
1522 		} else
1523 			err = view->input(new, view, ch);
1524 		break;
1525 	case 'A':
1526 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1527 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1528 		else
1529 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1530 		TAILQ_FOREACH(v, views, entry) {
1531 			if (v->reset) {
1532 				err = v->reset(v);
1533 				if (err)
1534 					return err;
1535 			}
1536 			if (v->child && v->child->reset) {
1537 				err = v->child->reset(v->child);
1538 				if (err)
1539 					return err;
1540 			}
1541 		}
1542 		break;
1543 	default:
1544 		err = view->input(new, view, ch);
1545 		break;
1546 	}
1547 
1548 	return err;
1549 }
1550 
1551 static int
1552 view_needs_focus_indication(struct tog_view *view)
1553 {
1554 	if (view_is_parent_view(view)) {
1555 		if (view->child == NULL || view->child->focussed)
1556 			return 0;
1557 		if (!view_is_splitscreen(view->child))
1558 			return 0;
1559 	} else if (!view_is_splitscreen(view))
1560 		return 0;
1561 
1562 	return view->focussed;
1563 }
1564 
1565 static const struct got_error *
1566 view_loop(struct tog_view *view)
1567 {
1568 	const struct got_error *err = NULL;
1569 	struct tog_view_list_head views;
1570 	struct tog_view *new_view;
1571 	char *mode;
1572 	int fast_refresh = 10;
1573 	int done = 0, errcode;
1574 
1575 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1576 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1577 		view->mode = TOG_VIEW_SPLIT_VERT;
1578 	else
1579 		view->mode = TOG_VIEW_SPLIT_HRZN;
1580 
1581 	errcode = pthread_mutex_lock(&tog_mutex);
1582 	if (errcode)
1583 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1584 
1585 	TAILQ_INIT(&views);
1586 	TAILQ_INSERT_HEAD(&views, view, entry);
1587 
1588 	view->focussed = 1;
1589 	err = view->show(view);
1590 	if (err)
1591 		return err;
1592 	update_panels();
1593 	doupdate();
1594 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1595 	    !tog_fatal_signal_received()) {
1596 		/* Refresh fast during initialization, then become slower. */
1597 		if (fast_refresh && fast_refresh-- == 0)
1598 			halfdelay(10); /* switch to once per second */
1599 
1600 		err = view_input(&new_view, &done, view, &views);
1601 		if (err)
1602 			break;
1603 		if (view->dying) {
1604 			struct tog_view *v, *prev = NULL;
1605 
1606 			if (view_is_parent_view(view))
1607 				prev = TAILQ_PREV(view, tog_view_list_head,
1608 				    entry);
1609 			else if (view->parent)
1610 				prev = view->parent;
1611 
1612 			if (view->parent) {
1613 				view->parent->child = NULL;
1614 				view->parent->focus_child = 0;
1615 				/* Restore fullscreen line height. */
1616 				view->parent->nlines = view->parent->lines;
1617 				err = view_resize(view->parent);
1618 				if (err)
1619 					break;
1620 				/* Make resized splits persist. */
1621 				view_transfer_size(view->parent, view);
1622 			} else
1623 				TAILQ_REMOVE(&views, view, entry);
1624 
1625 			err = view_close(view);
1626 			if (err)
1627 				goto done;
1628 
1629 			view = NULL;
1630 			TAILQ_FOREACH(v, &views, entry) {
1631 				if (v->focussed)
1632 					break;
1633 			}
1634 			if (view == NULL && new_view == NULL) {
1635 				/* No view has focus. Try to pick one. */
1636 				if (prev)
1637 					view = prev;
1638 				else if (!TAILQ_EMPTY(&views)) {
1639 					view = TAILQ_LAST(&views,
1640 					    tog_view_list_head);
1641 				}
1642 				if (view) {
1643 					if (view->focus_child) {
1644 						view->child->focussed = 1;
1645 						view = view->child;
1646 					} else
1647 						view->focussed = 1;
1648 				}
1649 			}
1650 		}
1651 		if (new_view) {
1652 			struct tog_view *v, *t;
1653 			/* Only allow one parent view per type. */
1654 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1655 				if (v->type != new_view->type)
1656 					continue;
1657 				TAILQ_REMOVE(&views, v, entry);
1658 				err = view_close(v);
1659 				if (err)
1660 					goto done;
1661 				break;
1662 			}
1663 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1664 			view = new_view;
1665 		}
1666 		if (view) {
1667 			if (view_is_parent_view(view)) {
1668 				if (view->child && view->child->focussed)
1669 					view = view->child;
1670 			} else {
1671 				if (view->parent && view->parent->focussed)
1672 					view = view->parent;
1673 			}
1674 			show_panel(view->panel);
1675 			if (view->child && view_is_splitscreen(view->child))
1676 				show_panel(view->child->panel);
1677 			if (view->parent && view_is_splitscreen(view)) {
1678 				err = view->parent->show(view->parent);
1679 				if (err)
1680 					goto done;
1681 			}
1682 			err = view->show(view);
1683 			if (err)
1684 				goto done;
1685 			if (view->child) {
1686 				err = view->child->show(view->child);
1687 				if (err)
1688 					goto done;
1689 			}
1690 			update_panels();
1691 			doupdate();
1692 		}
1693 	}
1694 done:
1695 	while (!TAILQ_EMPTY(&views)) {
1696 		const struct got_error *close_err;
1697 		view = TAILQ_FIRST(&views);
1698 		TAILQ_REMOVE(&views, view, entry);
1699 		close_err = view_close(view);
1700 		if (close_err && err == NULL)
1701 			err = close_err;
1702 	}
1703 
1704 	errcode = pthread_mutex_unlock(&tog_mutex);
1705 	if (errcode && err == NULL)
1706 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1707 
1708 	return err;
1709 }
1710 
1711 __dead static void
1712 usage_log(void)
1713 {
1714 	endwin();
1715 	fprintf(stderr,
1716 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1717 	    getprogname());
1718 	exit(1);
1719 }
1720 
1721 /* Create newly allocated wide-character string equivalent to a byte string. */
1722 static const struct got_error *
1723 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1724 {
1725 	char *vis = NULL;
1726 	const struct got_error *err = NULL;
1727 
1728 	*ws = NULL;
1729 	*wlen = mbstowcs(NULL, s, 0);
1730 	if (*wlen == (size_t)-1) {
1731 		int vislen;
1732 		if (errno != EILSEQ)
1733 			return got_error_from_errno("mbstowcs");
1734 
1735 		/* byte string invalid in current encoding; try to "fix" it */
1736 		err = got_mbsavis(&vis, &vislen, s);
1737 		if (err)
1738 			return err;
1739 		*wlen = mbstowcs(NULL, vis, 0);
1740 		if (*wlen == (size_t)-1) {
1741 			err = got_error_from_errno("mbstowcs"); /* give up */
1742 			goto done;
1743 		}
1744 	}
1745 
1746 	*ws = calloc(*wlen + 1, sizeof(**ws));
1747 	if (*ws == NULL) {
1748 		err = got_error_from_errno("calloc");
1749 		goto done;
1750 	}
1751 
1752 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1753 		err = got_error_from_errno("mbstowcs");
1754 done:
1755 	free(vis);
1756 	if (err) {
1757 		free(*ws);
1758 		*ws = NULL;
1759 		*wlen = 0;
1760 	}
1761 	return err;
1762 }
1763 
1764 static const struct got_error *
1765 expand_tab(char **ptr, const char *src)
1766 {
1767 	char	*dst;
1768 	size_t	 len, n, idx = 0, sz = 0;
1769 
1770 	*ptr = NULL;
1771 	n = len = strlen(src);
1772 	dst = malloc(n + 1);
1773 	if (dst == NULL)
1774 		return got_error_from_errno("malloc");
1775 
1776 	while (idx < len && src[idx]) {
1777 		const char c = src[idx];
1778 
1779 		if (c == '\t') {
1780 			size_t nb = TABSIZE - sz % TABSIZE;
1781 			char *p;
1782 
1783 			p = realloc(dst, n + nb);
1784 			if (p == NULL) {
1785 				free(dst);
1786 				return got_error_from_errno("realloc");
1787 
1788 			}
1789 			dst = p;
1790 			n += nb;
1791 			memset(dst + sz, ' ', nb);
1792 			sz += nb;
1793 		} else
1794 			dst[sz++] = src[idx];
1795 		++idx;
1796 	}
1797 
1798 	dst[sz] = '\0';
1799 	*ptr = dst;
1800 	return NULL;
1801 }
1802 
1803 /*
1804  * Advance at most n columns from wline starting at offset off.
1805  * Return the index to the first character after the span operation.
1806  * Return the combined column width of all spanned wide character in
1807  * *rcol.
1808  */
1809 static int
1810 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1811 {
1812 	int width, i, cols = 0;
1813 
1814 	if (n == 0) {
1815 		*rcol = cols;
1816 		return off;
1817 	}
1818 
1819 	for (i = off; wline[i] != L'\0'; ++i) {
1820 		if (wline[i] == L'\t')
1821 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1822 		else
1823 			width = wcwidth(wline[i]);
1824 
1825 		if (width == -1) {
1826 			width = 1;
1827 			wline[i] = L'.';
1828 		}
1829 
1830 		if (cols + width > n)
1831 			break;
1832 		cols += width;
1833 	}
1834 
1835 	*rcol = cols;
1836 	return i;
1837 }
1838 
1839 /*
1840  * Format a line for display, ensuring that it won't overflow a width limit.
1841  * With scrolling, the width returned refers to the scrolled version of the
1842  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1843  */
1844 static const struct got_error *
1845 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1846     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1847 {
1848 	const struct got_error *err = NULL;
1849 	int cols;
1850 	wchar_t *wline = NULL;
1851 	char *exstr = NULL;
1852 	size_t wlen;
1853 	int i, scrollx;
1854 
1855 	*wlinep = NULL;
1856 	*widthp = 0;
1857 
1858 	if (expand) {
1859 		err = expand_tab(&exstr, line);
1860 		if (err)
1861 			return err;
1862 	}
1863 
1864 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1865 	free(exstr);
1866 	if (err)
1867 		return err;
1868 
1869 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1870 
1871 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1872 		wline[wlen - 1] = L'\0';
1873 		wlen--;
1874 	}
1875 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1876 		wline[wlen - 1] = L'\0';
1877 		wlen--;
1878 	}
1879 
1880 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1881 	wline[i] = L'\0';
1882 
1883 	if (widthp)
1884 		*widthp = cols;
1885 	if (scrollxp)
1886 		*scrollxp = scrollx;
1887 	if (err)
1888 		free(wline);
1889 	else
1890 		*wlinep = wline;
1891 	return err;
1892 }
1893 
1894 static const struct got_error*
1895 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1896     struct got_object_id *id, struct got_repository *repo)
1897 {
1898 	static const struct got_error *err = NULL;
1899 	struct got_reflist_entry *re;
1900 	char *s;
1901 	const char *name;
1902 
1903 	*refs_str = NULL;
1904 
1905 	TAILQ_FOREACH(re, refs, entry) {
1906 		struct got_tag_object *tag = NULL;
1907 		struct got_object_id *ref_id;
1908 		int cmp;
1909 
1910 		name = got_ref_get_name(re->ref);
1911 		if (strcmp(name, GOT_REF_HEAD) == 0)
1912 			continue;
1913 		if (strncmp(name, "refs/", 5) == 0)
1914 			name += 5;
1915 		if (strncmp(name, "got/", 4) == 0 &&
1916 		    strncmp(name, "got/backup/", 11) != 0)
1917 			continue;
1918 		if (strncmp(name, "heads/", 6) == 0)
1919 			name += 6;
1920 		if (strncmp(name, "remotes/", 8) == 0) {
1921 			name += 8;
1922 			s = strstr(name, "/" GOT_REF_HEAD);
1923 			if (s != NULL && s[strlen(s)] == '\0')
1924 				continue;
1925 		}
1926 		err = got_ref_resolve(&ref_id, repo, re->ref);
1927 		if (err)
1928 			break;
1929 		if (strncmp(name, "tags/", 5) == 0) {
1930 			err = got_object_open_as_tag(&tag, repo, ref_id);
1931 			if (err) {
1932 				if (err->code != GOT_ERR_OBJ_TYPE) {
1933 					free(ref_id);
1934 					break;
1935 				}
1936 				/* Ref points at something other than a tag. */
1937 				err = NULL;
1938 				tag = NULL;
1939 			}
1940 		}
1941 		cmp = got_object_id_cmp(tag ?
1942 		    got_object_tag_get_object_id(tag) : ref_id, id);
1943 		free(ref_id);
1944 		if (tag)
1945 			got_object_tag_close(tag);
1946 		if (cmp != 0)
1947 			continue;
1948 		s = *refs_str;
1949 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1950 		    s ? ", " : "", name) == -1) {
1951 			err = got_error_from_errno("asprintf");
1952 			free(s);
1953 			*refs_str = NULL;
1954 			break;
1955 		}
1956 		free(s);
1957 	}
1958 
1959 	return err;
1960 }
1961 
1962 static const struct got_error *
1963 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1964     int col_tab_align)
1965 {
1966 	char *smallerthan;
1967 
1968 	smallerthan = strchr(author, '<');
1969 	if (smallerthan && smallerthan[1] != '\0')
1970 		author = smallerthan + 1;
1971 	author[strcspn(author, "@>")] = '\0';
1972 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1973 	    col_tab_align, 0);
1974 }
1975 
1976 static const struct got_error *
1977 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1978     struct got_object_id *id, const size_t date_display_cols,
1979     int author_display_cols)
1980 {
1981 	struct tog_log_view_state *s = &view->state.log;
1982 	const struct got_error *err = NULL;
1983 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1984 	char *logmsg0 = NULL, *logmsg = NULL;
1985 	char *author = NULL;
1986 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1987 	int author_width, logmsg_width;
1988 	char *newline, *line = NULL;
1989 	int col, limit, scrollx;
1990 	const int avail = view->ncols;
1991 	struct tm tm;
1992 	time_t committer_time;
1993 	struct tog_color *tc;
1994 
1995 	committer_time = got_object_commit_get_committer_time(commit);
1996 	if (gmtime_r(&committer_time, &tm) == NULL)
1997 		return got_error_from_errno("gmtime_r");
1998 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1999 		return got_error(GOT_ERR_NO_SPACE);
2000 
2001 	if (avail <= date_display_cols)
2002 		limit = MIN(sizeof(datebuf) - 1, avail);
2003 	else
2004 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2005 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2006 	if (tc)
2007 		wattr_on(view->window,
2008 		    COLOR_PAIR(tc->colorpair), NULL);
2009 	waddnstr(view->window, datebuf, limit);
2010 	if (tc)
2011 		wattr_off(view->window,
2012 		    COLOR_PAIR(tc->colorpair), NULL);
2013 	col = limit;
2014 	if (col > avail)
2015 		goto done;
2016 
2017 	if (avail >= 120) {
2018 		char *id_str;
2019 		err = got_object_id_str(&id_str, id);
2020 		if (err)
2021 			goto done;
2022 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2023 		if (tc)
2024 			wattr_on(view->window,
2025 			    COLOR_PAIR(tc->colorpair), NULL);
2026 		wprintw(view->window, "%.8s ", id_str);
2027 		if (tc)
2028 			wattr_off(view->window,
2029 			    COLOR_PAIR(tc->colorpair), NULL);
2030 		free(id_str);
2031 		col += 9;
2032 		if (col > avail)
2033 			goto done;
2034 	}
2035 
2036 	if (s->use_committer)
2037 		author = strdup(got_object_commit_get_committer(commit));
2038 	else
2039 		author = strdup(got_object_commit_get_author(commit));
2040 	if (author == NULL) {
2041 		err = got_error_from_errno("strdup");
2042 		goto done;
2043 	}
2044 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2045 	if (err)
2046 		goto done;
2047 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2048 	if (tc)
2049 		wattr_on(view->window,
2050 		    COLOR_PAIR(tc->colorpair), NULL);
2051 	waddwstr(view->window, wauthor);
2052 	if (tc)
2053 		wattr_off(view->window,
2054 		    COLOR_PAIR(tc->colorpair), NULL);
2055 	col += author_width;
2056 	while (col < avail && author_width < author_display_cols + 2) {
2057 		waddch(view->window, ' ');
2058 		col++;
2059 		author_width++;
2060 	}
2061 	if (col > avail)
2062 		goto done;
2063 
2064 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2065 	if (err)
2066 		goto done;
2067 	logmsg = logmsg0;
2068 	while (*logmsg == '\n')
2069 		logmsg++;
2070 	newline = strchr(logmsg, '\n');
2071 	if (newline)
2072 		*newline = '\0';
2073 	limit = avail - col;
2074 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2075 		limit--;	/* for the border */
2076 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2077 	    limit, col, 1);
2078 	if (err)
2079 		goto done;
2080 	waddwstr(view->window, &wlogmsg[scrollx]);
2081 	col += MAX(logmsg_width, 0);
2082 	while (col < avail) {
2083 		waddch(view->window, ' ');
2084 		col++;
2085 	}
2086 done:
2087 	free(logmsg0);
2088 	free(wlogmsg);
2089 	free(author);
2090 	free(wauthor);
2091 	free(line);
2092 	return err;
2093 }
2094 
2095 static struct commit_queue_entry *
2096 alloc_commit_queue_entry(struct got_commit_object *commit,
2097     struct got_object_id *id)
2098 {
2099 	struct commit_queue_entry *entry;
2100 
2101 	entry = calloc(1, sizeof(*entry));
2102 	if (entry == NULL)
2103 		return NULL;
2104 
2105 	entry->id = id;
2106 	entry->commit = commit;
2107 	return entry;
2108 }
2109 
2110 static void
2111 pop_commit(struct commit_queue *commits)
2112 {
2113 	struct commit_queue_entry *entry;
2114 
2115 	entry = TAILQ_FIRST(&commits->head);
2116 	TAILQ_REMOVE(&commits->head, entry, entry);
2117 	got_object_commit_close(entry->commit);
2118 	commits->ncommits--;
2119 	/* Don't free entry->id! It is owned by the commit graph. */
2120 	free(entry);
2121 }
2122 
2123 static void
2124 free_commits(struct commit_queue *commits)
2125 {
2126 	while (!TAILQ_EMPTY(&commits->head))
2127 		pop_commit(commits);
2128 }
2129 
2130 static const struct got_error *
2131 match_commit(int *have_match, struct got_object_id *id,
2132     struct got_commit_object *commit, regex_t *regex)
2133 {
2134 	const struct got_error *err = NULL;
2135 	regmatch_t regmatch;
2136 	char *id_str = NULL, *logmsg = NULL;
2137 
2138 	*have_match = 0;
2139 
2140 	err = got_object_id_str(&id_str, id);
2141 	if (err)
2142 		return err;
2143 
2144 	err = got_object_commit_get_logmsg(&logmsg, commit);
2145 	if (err)
2146 		goto done;
2147 
2148 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2149 	    &regmatch, 0) == 0 ||
2150 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2151 	    &regmatch, 0) == 0 ||
2152 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2153 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2154 		*have_match = 1;
2155 done:
2156 	free(id_str);
2157 	free(logmsg);
2158 	return err;
2159 }
2160 
2161 static const struct got_error *
2162 queue_commits(struct tog_log_thread_args *a)
2163 {
2164 	const struct got_error *err = NULL;
2165 
2166 	/*
2167 	 * We keep all commits open throughout the lifetime of the log
2168 	 * view in order to avoid having to re-fetch commits from disk
2169 	 * while updating the display.
2170 	 */
2171 	do {
2172 		struct got_object_id *id;
2173 		struct got_commit_object *commit;
2174 		struct commit_queue_entry *entry;
2175 		int errcode;
2176 
2177 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2178 		    NULL, NULL);
2179 		if (err || id == NULL)
2180 			break;
2181 
2182 		err = got_object_open_as_commit(&commit, a->repo, id);
2183 		if (err)
2184 			break;
2185 		entry = alloc_commit_queue_entry(commit, id);
2186 		if (entry == NULL) {
2187 			err = got_error_from_errno("alloc_commit_queue_entry");
2188 			break;
2189 		}
2190 
2191 		errcode = pthread_mutex_lock(&tog_mutex);
2192 		if (errcode) {
2193 			err = got_error_set_errno(errcode,
2194 			    "pthread_mutex_lock");
2195 			break;
2196 		}
2197 
2198 		entry->idx = a->commits->ncommits;
2199 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2200 		a->commits->ncommits++;
2201 
2202 		if (*a->searching == TOG_SEARCH_FORWARD &&
2203 		    !*a->search_next_done) {
2204 			int have_match;
2205 			err = match_commit(&have_match, id, commit, a->regex);
2206 			if (err)
2207 				break;
2208 			if (have_match)
2209 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2210 		}
2211 
2212 		errcode = pthread_mutex_unlock(&tog_mutex);
2213 		if (errcode && err == NULL)
2214 			err = got_error_set_errno(errcode,
2215 			    "pthread_mutex_unlock");
2216 		if (err)
2217 			break;
2218 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2219 
2220 	return err;
2221 }
2222 
2223 static void
2224 select_commit(struct tog_log_view_state *s)
2225 {
2226 	struct commit_queue_entry *entry;
2227 	int ncommits = 0;
2228 
2229 	entry = s->first_displayed_entry;
2230 	while (entry) {
2231 		if (ncommits == s->selected) {
2232 			s->selected_entry = entry;
2233 			break;
2234 		}
2235 		entry = TAILQ_NEXT(entry, entry);
2236 		ncommits++;
2237 	}
2238 }
2239 
2240 static const struct got_error *
2241 draw_commits(struct tog_view *view)
2242 {
2243 	const struct got_error *err = NULL;
2244 	struct tog_log_view_state *s = &view->state.log;
2245 	struct commit_queue_entry *entry = s->selected_entry;
2246 	int limit = view->nlines;
2247 	int width;
2248 	int ncommits, author_cols = 4;
2249 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2250 	char *refs_str = NULL;
2251 	wchar_t *wline;
2252 	struct tog_color *tc;
2253 	static const size_t date_display_cols = 12;
2254 
2255 	if (view_is_hsplit_top(view))
2256 		--limit;  /* account for border */
2257 
2258 	if (s->selected_entry &&
2259 	    !(view->searching && view->search_next_done == 0)) {
2260 		struct got_reflist_head *refs;
2261 		err = got_object_id_str(&id_str, s->selected_entry->id);
2262 		if (err)
2263 			return err;
2264 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2265 		    s->selected_entry->id);
2266 		if (refs) {
2267 			err = build_refs_str(&refs_str, refs,
2268 			    s->selected_entry->id, s->repo);
2269 			if (err)
2270 				goto done;
2271 		}
2272 	}
2273 
2274 	if (s->thread_args.commits_needed == 0)
2275 		halfdelay(10); /* disable fast refresh */
2276 
2277 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2278 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2279 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2280 		    (view->searching && !view->search_next_done) ?
2281 		    "searching..." : "loading...") == -1) {
2282 			err = got_error_from_errno("asprintf");
2283 			goto done;
2284 		}
2285 	} else {
2286 		const char *search_str = NULL;
2287 
2288 		if (view->searching) {
2289 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2290 				search_str = "no more matches";
2291 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2292 				search_str = "no matches found";
2293 			else if (!view->search_next_done)
2294 				search_str = "searching...";
2295 		}
2296 
2297 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2298 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2299 		    search_str ? search_str :
2300 		    (refs_str ? refs_str : "")) == -1) {
2301 			err = got_error_from_errno("asprintf");
2302 			goto done;
2303 		}
2304 	}
2305 
2306 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2307 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2308 		    "........................................",
2309 		    s->in_repo_path, ncommits_str) == -1) {
2310 			err = got_error_from_errno("asprintf");
2311 			header = NULL;
2312 			goto done;
2313 		}
2314 	} else if (asprintf(&header, "commit %s%s",
2315 	    id_str ? id_str : "........................................",
2316 	    ncommits_str) == -1) {
2317 		err = got_error_from_errno("asprintf");
2318 		header = NULL;
2319 		goto done;
2320 	}
2321 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2322 	if (err)
2323 		goto done;
2324 
2325 	werase(view->window);
2326 
2327 	if (view_needs_focus_indication(view))
2328 		wstandout(view->window);
2329 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2330 	if (tc)
2331 		wattr_on(view->window,
2332 		    COLOR_PAIR(tc->colorpair), NULL);
2333 	waddwstr(view->window, wline);
2334 	if (tc)
2335 		wattr_off(view->window,
2336 		    COLOR_PAIR(tc->colorpair), NULL);
2337 	while (width < view->ncols) {
2338 		waddch(view->window, ' ');
2339 		width++;
2340 	}
2341 	if (view_needs_focus_indication(view))
2342 		wstandend(view->window);
2343 	free(wline);
2344 	if (limit <= 1)
2345 		goto done;
2346 
2347 	/* Grow author column size if necessary, and set view->maxx. */
2348 	entry = s->first_displayed_entry;
2349 	ncommits = 0;
2350 	view->maxx = 0;
2351 	while (entry) {
2352 		struct got_commit_object *c = entry->commit;
2353 		char *author, *eol, *msg, *msg0;
2354 		wchar_t *wauthor, *wmsg;
2355 		int width;
2356 		if (ncommits >= limit - 1)
2357 			break;
2358 		if (s->use_committer)
2359 			author = strdup(got_object_commit_get_committer(c));
2360 		else
2361 			author = strdup(got_object_commit_get_author(c));
2362 		if (author == NULL) {
2363 			err = got_error_from_errno("strdup");
2364 			goto done;
2365 		}
2366 		err = format_author(&wauthor, &width, author, COLS,
2367 		    date_display_cols);
2368 		if (author_cols < width)
2369 			author_cols = width;
2370 		free(wauthor);
2371 		free(author);
2372 		if (err)
2373 			goto done;
2374 		err = got_object_commit_get_logmsg(&msg0, c);
2375 		if (err)
2376 			goto done;
2377 		msg = msg0;
2378 		while (*msg == '\n')
2379 			++msg;
2380 		if ((eol = strchr(msg, '\n')))
2381 			*eol = '\0';
2382 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2383 		    date_display_cols + author_cols, 0);
2384 		if (err)
2385 			goto done;
2386 		view->maxx = MAX(view->maxx, width);
2387 		free(msg0);
2388 		free(wmsg);
2389 		ncommits++;
2390 		entry = TAILQ_NEXT(entry, entry);
2391 	}
2392 
2393 	entry = s->first_displayed_entry;
2394 	s->last_displayed_entry = s->first_displayed_entry;
2395 	ncommits = 0;
2396 	while (entry) {
2397 		if (ncommits >= limit - 1)
2398 			break;
2399 		if (ncommits == s->selected)
2400 			wstandout(view->window);
2401 		err = draw_commit(view, entry->commit, entry->id,
2402 		    date_display_cols, author_cols);
2403 		if (ncommits == s->selected)
2404 			wstandend(view->window);
2405 		if (err)
2406 			goto done;
2407 		ncommits++;
2408 		s->last_displayed_entry = entry;
2409 		entry = TAILQ_NEXT(entry, entry);
2410 	}
2411 
2412 	view_border(view);
2413 done:
2414 	free(id_str);
2415 	free(refs_str);
2416 	free(ncommits_str);
2417 	free(header);
2418 	return err;
2419 }
2420 
2421 static void
2422 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2423 {
2424 	struct commit_queue_entry *entry;
2425 	int nscrolled = 0;
2426 
2427 	entry = TAILQ_FIRST(&s->commits.head);
2428 	if (s->first_displayed_entry == entry)
2429 		return;
2430 
2431 	entry = s->first_displayed_entry;
2432 	while (entry && nscrolled < maxscroll) {
2433 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2434 		if (entry) {
2435 			s->first_displayed_entry = entry;
2436 			nscrolled++;
2437 		}
2438 	}
2439 }
2440 
2441 static const struct got_error *
2442 trigger_log_thread(struct tog_view *view, int wait)
2443 {
2444 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2445 	int errcode;
2446 
2447 	halfdelay(1); /* fast refresh while loading commits */
2448 
2449 	while (!ta->log_complete && !tog_thread_error &&
2450 	    (ta->commits_needed > 0 || ta->load_all)) {
2451 		/* Wake the log thread. */
2452 		errcode = pthread_cond_signal(&ta->need_commits);
2453 		if (errcode)
2454 			return got_error_set_errno(errcode,
2455 			    "pthread_cond_signal");
2456 
2457 		/*
2458 		 * The mutex will be released while the view loop waits
2459 		 * in wgetch(), at which time the log thread will run.
2460 		 */
2461 		if (!wait)
2462 			break;
2463 
2464 		/* Display progress update in log view. */
2465 		show_log_view(view);
2466 		update_panels();
2467 		doupdate();
2468 
2469 		/* Wait right here while next commit is being loaded. */
2470 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2471 		if (errcode)
2472 			return got_error_set_errno(errcode,
2473 			    "pthread_cond_wait");
2474 
2475 		/* Display progress update in log view. */
2476 		show_log_view(view);
2477 		update_panels();
2478 		doupdate();
2479 	}
2480 
2481 	return NULL;
2482 }
2483 
2484 static const struct got_error *
2485 request_log_commits(struct tog_view *view)
2486 {
2487 	struct tog_log_view_state	*state = &view->state.log;
2488 	const struct got_error		*err = NULL;
2489 
2490 	if (state->thread_args.log_complete)
2491 		return NULL;
2492 
2493 	state->thread_args.commits_needed += view->nscrolled;
2494 	err = trigger_log_thread(view, 1);
2495 	view->nscrolled = 0;
2496 
2497 	return err;
2498 }
2499 
2500 static const struct got_error *
2501 log_scroll_down(struct tog_view *view, int maxscroll)
2502 {
2503 	struct tog_log_view_state *s = &view->state.log;
2504 	const struct got_error *err = NULL;
2505 	struct commit_queue_entry *pentry;
2506 	int nscrolled = 0, ncommits_needed;
2507 
2508 	if (s->last_displayed_entry == NULL)
2509 		return NULL;
2510 
2511 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2512 	if (s->commits.ncommits < ncommits_needed &&
2513 	    !s->thread_args.log_complete) {
2514 		/*
2515 		 * Ask the log thread for required amount of commits.
2516 		 */
2517 		s->thread_args.commits_needed +=
2518 		    ncommits_needed - s->commits.ncommits;
2519 		err = trigger_log_thread(view, 1);
2520 		if (err)
2521 			return err;
2522 	}
2523 
2524 	do {
2525 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2526 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2527 			break;
2528 
2529 		s->last_displayed_entry = pentry ?
2530 		    pentry : s->last_displayed_entry;;
2531 
2532 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2533 		if (pentry == NULL)
2534 			break;
2535 		s->first_displayed_entry = pentry;
2536 	} while (++nscrolled < maxscroll);
2537 
2538 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2539 		view->nscrolled += nscrolled;
2540 	else
2541 		view->nscrolled = 0;
2542 
2543 	return err;
2544 }
2545 
2546 static const struct got_error *
2547 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2548     struct got_commit_object *commit, struct got_object_id *commit_id,
2549     struct tog_view *log_view, struct got_repository *repo)
2550 {
2551 	const struct got_error *err;
2552 	struct got_object_qid *parent_id;
2553 	struct tog_view *diff_view;
2554 
2555 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2556 	if (diff_view == NULL)
2557 		return got_error_from_errno("view_open");
2558 
2559 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2560 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2561 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2562 	if (err == NULL)
2563 		*new_view = diff_view;
2564 	return err;
2565 }
2566 
2567 static const struct got_error *
2568 tree_view_visit_subtree(struct tog_tree_view_state *s,
2569     struct got_tree_object *subtree)
2570 {
2571 	struct tog_parent_tree *parent;
2572 
2573 	parent = calloc(1, sizeof(*parent));
2574 	if (parent == NULL)
2575 		return got_error_from_errno("calloc");
2576 
2577 	parent->tree = s->tree;
2578 	parent->first_displayed_entry = s->first_displayed_entry;
2579 	parent->selected_entry = s->selected_entry;
2580 	parent->selected = s->selected;
2581 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2582 	s->tree = subtree;
2583 	s->selected = 0;
2584 	s->first_displayed_entry = NULL;
2585 	return NULL;
2586 }
2587 
2588 static const struct got_error *
2589 tree_view_walk_path(struct tog_tree_view_state *s,
2590     struct got_commit_object *commit, const char *path)
2591 {
2592 	const struct got_error *err = NULL;
2593 	struct got_tree_object *tree = NULL;
2594 	const char *p;
2595 	char *slash, *subpath = NULL;
2596 
2597 	/* Walk the path and open corresponding tree objects. */
2598 	p = path;
2599 	while (*p) {
2600 		struct got_tree_entry *te;
2601 		struct got_object_id *tree_id;
2602 		char *te_name;
2603 
2604 		while (p[0] == '/')
2605 			p++;
2606 
2607 		/* Ensure the correct subtree entry is selected. */
2608 		slash = strchr(p, '/');
2609 		if (slash == NULL)
2610 			te_name = strdup(p);
2611 		else
2612 			te_name = strndup(p, slash - p);
2613 		if (te_name == NULL) {
2614 			err = got_error_from_errno("strndup");
2615 			break;
2616 		}
2617 		te = got_object_tree_find_entry(s->tree, te_name);
2618 		if (te == NULL) {
2619 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2620 			free(te_name);
2621 			break;
2622 		}
2623 		free(te_name);
2624 		s->first_displayed_entry = s->selected_entry = te;
2625 
2626 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2627 			break; /* jump to this file's entry */
2628 
2629 		slash = strchr(p, '/');
2630 		if (slash)
2631 			subpath = strndup(path, slash - path);
2632 		else
2633 			subpath = strdup(path);
2634 		if (subpath == NULL) {
2635 			err = got_error_from_errno("strdup");
2636 			break;
2637 		}
2638 
2639 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2640 		    subpath);
2641 		if (err)
2642 			break;
2643 
2644 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2645 		free(tree_id);
2646 		if (err)
2647 			break;
2648 
2649 		err = tree_view_visit_subtree(s, tree);
2650 		if (err) {
2651 			got_object_tree_close(tree);
2652 			break;
2653 		}
2654 		if (slash == NULL)
2655 			break;
2656 		free(subpath);
2657 		subpath = NULL;
2658 		p = slash;
2659 	}
2660 
2661 	free(subpath);
2662 	return err;
2663 }
2664 
2665 static const struct got_error *
2666 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2667     struct commit_queue_entry *entry, const char *path,
2668     const char *head_ref_name, struct got_repository *repo)
2669 {
2670 	const struct got_error *err = NULL;
2671 	struct tog_tree_view_state *s;
2672 	struct tog_view *tree_view;
2673 
2674 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2675 	if (tree_view == NULL)
2676 		return got_error_from_errno("view_open");
2677 
2678 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2679 	if (err)
2680 		return err;
2681 	s = &tree_view->state.tree;
2682 
2683 	*new_view = tree_view;
2684 
2685 	if (got_path_is_root_dir(path))
2686 		return NULL;
2687 
2688 	return tree_view_walk_path(s, entry->commit, path);
2689 }
2690 
2691 static const struct got_error *
2692 block_signals_used_by_main_thread(void)
2693 {
2694 	sigset_t sigset;
2695 	int errcode;
2696 
2697 	if (sigemptyset(&sigset) == -1)
2698 		return got_error_from_errno("sigemptyset");
2699 
2700 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2701 	if (sigaddset(&sigset, SIGWINCH) == -1)
2702 		return got_error_from_errno("sigaddset");
2703 	if (sigaddset(&sigset, SIGCONT) == -1)
2704 		return got_error_from_errno("sigaddset");
2705 	if (sigaddset(&sigset, SIGINT) == -1)
2706 		return got_error_from_errno("sigaddset");
2707 	if (sigaddset(&sigset, SIGTERM) == -1)
2708 		return got_error_from_errno("sigaddset");
2709 
2710 	/* ncurses handles SIGTSTP */
2711 	if (sigaddset(&sigset, SIGTSTP) == -1)
2712 		return got_error_from_errno("sigaddset");
2713 
2714 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2715 	if (errcode)
2716 		return got_error_set_errno(errcode, "pthread_sigmask");
2717 
2718 	return NULL;
2719 }
2720 
2721 static void *
2722 log_thread(void *arg)
2723 {
2724 	const struct got_error *err = NULL;
2725 	int errcode = 0;
2726 	struct tog_log_thread_args *a = arg;
2727 	int done = 0;
2728 
2729 	/*
2730 	 * Sync startup with main thread such that we begin our
2731 	 * work once view_input() has released the mutex.
2732 	 */
2733 	errcode = pthread_mutex_lock(&tog_mutex);
2734 	if (errcode) {
2735 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2736 		return (void *)err;
2737 	}
2738 
2739 	err = block_signals_used_by_main_thread();
2740 	if (err) {
2741 		pthread_mutex_unlock(&tog_mutex);
2742 		goto done;
2743 	}
2744 
2745 	while (!done && !err && !tog_fatal_signal_received()) {
2746 		errcode = pthread_mutex_unlock(&tog_mutex);
2747 		if (errcode) {
2748 			err = got_error_set_errno(errcode,
2749 			    "pthread_mutex_unlock");
2750 			goto done;
2751 		}
2752 		err = queue_commits(a);
2753 		if (err) {
2754 			if (err->code != GOT_ERR_ITER_COMPLETED)
2755 				goto done;
2756 			err = NULL;
2757 			done = 1;
2758 		} else if (a->commits_needed > 0 && !a->load_all)
2759 			a->commits_needed--;
2760 
2761 		errcode = pthread_mutex_lock(&tog_mutex);
2762 		if (errcode) {
2763 			err = got_error_set_errno(errcode,
2764 			    "pthread_mutex_lock");
2765 			goto done;
2766 		} else if (*a->quit)
2767 			done = 1;
2768 		else if (*a->first_displayed_entry == NULL) {
2769 			*a->first_displayed_entry =
2770 			    TAILQ_FIRST(&a->commits->head);
2771 			*a->selected_entry = *a->first_displayed_entry;
2772 		}
2773 
2774 		errcode = pthread_cond_signal(&a->commit_loaded);
2775 		if (errcode) {
2776 			err = got_error_set_errno(errcode,
2777 			    "pthread_cond_signal");
2778 			pthread_mutex_unlock(&tog_mutex);
2779 			goto done;
2780 		}
2781 
2782 		if (done)
2783 			a->commits_needed = 0;
2784 		else {
2785 			if (a->commits_needed == 0 && !a->load_all) {
2786 				errcode = pthread_cond_wait(&a->need_commits,
2787 				    &tog_mutex);
2788 				if (errcode) {
2789 					err = got_error_set_errno(errcode,
2790 					    "pthread_cond_wait");
2791 					pthread_mutex_unlock(&tog_mutex);
2792 					goto done;
2793 				}
2794 				if (*a->quit)
2795 					done = 1;
2796 			}
2797 		}
2798 	}
2799 	a->log_complete = 1;
2800 	errcode = pthread_mutex_unlock(&tog_mutex);
2801 	if (errcode)
2802 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2803 done:
2804 	if (err) {
2805 		tog_thread_error = 1;
2806 		pthread_cond_signal(&a->commit_loaded);
2807 	}
2808 	return (void *)err;
2809 }
2810 
2811 static const struct got_error *
2812 stop_log_thread(struct tog_log_view_state *s)
2813 {
2814 	const struct got_error *err = NULL, *thread_err = NULL;
2815 	int errcode;
2816 
2817 	if (s->thread) {
2818 		s->quit = 1;
2819 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2820 		if (errcode)
2821 			return got_error_set_errno(errcode,
2822 			    "pthread_cond_signal");
2823 		errcode = pthread_mutex_unlock(&tog_mutex);
2824 		if (errcode)
2825 			return got_error_set_errno(errcode,
2826 			    "pthread_mutex_unlock");
2827 		errcode = pthread_join(s->thread, (void **)&thread_err);
2828 		if (errcode)
2829 			return got_error_set_errno(errcode, "pthread_join");
2830 		errcode = pthread_mutex_lock(&tog_mutex);
2831 		if (errcode)
2832 			return got_error_set_errno(errcode,
2833 			    "pthread_mutex_lock");
2834 		s->thread = 0; //NULL;
2835 	}
2836 
2837 	if (s->thread_args.repo) {
2838 		err = got_repo_close(s->thread_args.repo);
2839 		s->thread_args.repo = NULL;
2840 	}
2841 
2842 	if (s->thread_args.pack_fds) {
2843 		const struct got_error *pack_err =
2844 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2845 		if (err == NULL)
2846 			err = pack_err;
2847 		s->thread_args.pack_fds = NULL;
2848 	}
2849 
2850 	if (s->thread_args.graph) {
2851 		got_commit_graph_close(s->thread_args.graph);
2852 		s->thread_args.graph = NULL;
2853 	}
2854 
2855 	return err ? err : thread_err;
2856 }
2857 
2858 static const struct got_error *
2859 close_log_view(struct tog_view *view)
2860 {
2861 	const struct got_error *err = NULL;
2862 	struct tog_log_view_state *s = &view->state.log;
2863 	int errcode;
2864 
2865 	err = stop_log_thread(s);
2866 
2867 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2868 	if (errcode && err == NULL)
2869 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2870 
2871 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2872 	if (errcode && err == NULL)
2873 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2874 
2875 	free_commits(&s->commits);
2876 	free(s->in_repo_path);
2877 	s->in_repo_path = NULL;
2878 	free(s->start_id);
2879 	s->start_id = NULL;
2880 	free(s->head_ref_name);
2881 	s->head_ref_name = NULL;
2882 	return err;
2883 }
2884 
2885 static const struct got_error *
2886 search_start_log_view(struct tog_view *view)
2887 {
2888 	struct tog_log_view_state *s = &view->state.log;
2889 
2890 	s->matched_entry = NULL;
2891 	s->search_entry = NULL;
2892 	return NULL;
2893 }
2894 
2895 static const struct got_error *
2896 search_next_log_view(struct tog_view *view)
2897 {
2898 	const struct got_error *err = NULL;
2899 	struct tog_log_view_state *s = &view->state.log;
2900 	struct commit_queue_entry *entry;
2901 
2902 	/* Display progress update in log view. */
2903 	show_log_view(view);
2904 	update_panels();
2905 	doupdate();
2906 
2907 	if (s->search_entry) {
2908 		int errcode, ch;
2909 		errcode = pthread_mutex_unlock(&tog_mutex);
2910 		if (errcode)
2911 			return got_error_set_errno(errcode,
2912 			    "pthread_mutex_unlock");
2913 		ch = wgetch(view->window);
2914 		errcode = pthread_mutex_lock(&tog_mutex);
2915 		if (errcode)
2916 			return got_error_set_errno(errcode,
2917 			    "pthread_mutex_lock");
2918 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2919 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2920 			return NULL;
2921 		}
2922 		if (view->searching == TOG_SEARCH_FORWARD)
2923 			entry = TAILQ_NEXT(s->search_entry, entry);
2924 		else
2925 			entry = TAILQ_PREV(s->search_entry,
2926 			    commit_queue_head, entry);
2927 	} else if (s->matched_entry) {
2928 		int matched_idx = s->matched_entry->idx;
2929 		int selected_idx = s->selected_entry->idx;
2930 
2931 		/*
2932 		 * If the user has moved the cursor after we hit a match,
2933 		 * the position from where we should continue searching
2934 		 * might have changed.
2935 		 */
2936 		if (view->searching == TOG_SEARCH_FORWARD) {
2937 			if (matched_idx > selected_idx)
2938 				entry = TAILQ_NEXT(s->selected_entry, entry);
2939 			else
2940 				entry = TAILQ_NEXT(s->matched_entry, entry);
2941 		} else {
2942 			if (matched_idx < selected_idx)
2943 				entry = TAILQ_PREV(s->selected_entry,
2944 						commit_queue_head, entry);
2945 			else
2946 				entry = TAILQ_PREV(s->matched_entry,
2947 						commit_queue_head, entry);
2948 		}
2949 	} else {
2950 		entry = s->selected_entry;
2951 	}
2952 
2953 	while (1) {
2954 		int have_match = 0;
2955 
2956 		if (entry == NULL) {
2957 			if (s->thread_args.log_complete ||
2958 			    view->searching == TOG_SEARCH_BACKWARD) {
2959 				view->search_next_done =
2960 				    (s->matched_entry == NULL ?
2961 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2962 				s->search_entry = NULL;
2963 				return NULL;
2964 			}
2965 			/*
2966 			 * Poke the log thread for more commits and return,
2967 			 * allowing the main loop to make progress. Search
2968 			 * will resume at s->search_entry once we come back.
2969 			 */
2970 			s->thread_args.commits_needed++;
2971 			return trigger_log_thread(view, 0);
2972 		}
2973 
2974 		err = match_commit(&have_match, entry->id, entry->commit,
2975 		    &view->regex);
2976 		if (err)
2977 			break;
2978 		if (have_match) {
2979 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2980 			s->matched_entry = entry;
2981 			break;
2982 		}
2983 
2984 		s->search_entry = entry;
2985 		if (view->searching == TOG_SEARCH_FORWARD)
2986 			entry = TAILQ_NEXT(entry, entry);
2987 		else
2988 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2989 	}
2990 
2991 	if (s->matched_entry) {
2992 		int cur = s->selected_entry->idx;
2993 		while (cur < s->matched_entry->idx) {
2994 			err = input_log_view(NULL, view, KEY_DOWN);
2995 			if (err)
2996 				return err;
2997 			cur++;
2998 		}
2999 		while (cur > s->matched_entry->idx) {
3000 			err = input_log_view(NULL, view, KEY_UP);
3001 			if (err)
3002 				return err;
3003 			cur--;
3004 		}
3005 	}
3006 
3007 	s->search_entry = NULL;
3008 
3009 	return NULL;
3010 }
3011 
3012 static const struct got_error *
3013 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3014     struct got_repository *repo, const char *head_ref_name,
3015     const char *in_repo_path, int log_branches)
3016 {
3017 	const struct got_error *err = NULL;
3018 	struct tog_log_view_state *s = &view->state.log;
3019 	struct got_repository *thread_repo = NULL;
3020 	struct got_commit_graph *thread_graph = NULL;
3021 	int errcode;
3022 
3023 	if (in_repo_path != s->in_repo_path) {
3024 		free(s->in_repo_path);
3025 		s->in_repo_path = strdup(in_repo_path);
3026 		if (s->in_repo_path == NULL)
3027 			return got_error_from_errno("strdup");
3028 	}
3029 
3030 	/* The commit queue only contains commits being displayed. */
3031 	TAILQ_INIT(&s->commits.head);
3032 	s->commits.ncommits = 0;
3033 
3034 	s->repo = repo;
3035 	if (head_ref_name) {
3036 		s->head_ref_name = strdup(head_ref_name);
3037 		if (s->head_ref_name == NULL) {
3038 			err = got_error_from_errno("strdup");
3039 			goto done;
3040 		}
3041 	}
3042 	s->start_id = got_object_id_dup(start_id);
3043 	if (s->start_id == NULL) {
3044 		err = got_error_from_errno("got_object_id_dup");
3045 		goto done;
3046 	}
3047 	s->log_branches = log_branches;
3048 
3049 	STAILQ_INIT(&s->colors);
3050 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3051 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3052 		    get_color_value("TOG_COLOR_COMMIT"));
3053 		if (err)
3054 			goto done;
3055 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3056 		    get_color_value("TOG_COLOR_AUTHOR"));
3057 		if (err) {
3058 			free_colors(&s->colors);
3059 			goto done;
3060 		}
3061 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3062 		    get_color_value("TOG_COLOR_DATE"));
3063 		if (err) {
3064 			free_colors(&s->colors);
3065 			goto done;
3066 		}
3067 	}
3068 
3069 	view->show = show_log_view;
3070 	view->input = input_log_view;
3071 	view->resize = resize_log_view;
3072 	view->close = close_log_view;
3073 	view->search_start = search_start_log_view;
3074 	view->search_next = search_next_log_view;
3075 
3076 	if (s->thread_args.pack_fds == NULL) {
3077 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3078 		if (err)
3079 			goto done;
3080 	}
3081 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3082 	    s->thread_args.pack_fds);
3083 	if (err)
3084 		goto done;
3085 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3086 	    !s->log_branches);
3087 	if (err)
3088 		goto done;
3089 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3090 	    s->repo, NULL, NULL);
3091 	if (err)
3092 		goto done;
3093 
3094 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3095 	if (errcode) {
3096 		err = got_error_set_errno(errcode, "pthread_cond_init");
3097 		goto done;
3098 	}
3099 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3100 	if (errcode) {
3101 		err = got_error_set_errno(errcode, "pthread_cond_init");
3102 		goto done;
3103 	}
3104 
3105 	s->thread_args.commits_needed = view->nlines;
3106 	s->thread_args.graph = thread_graph;
3107 	s->thread_args.commits = &s->commits;
3108 	s->thread_args.in_repo_path = s->in_repo_path;
3109 	s->thread_args.start_id = s->start_id;
3110 	s->thread_args.repo = thread_repo;
3111 	s->thread_args.log_complete = 0;
3112 	s->thread_args.quit = &s->quit;
3113 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3114 	s->thread_args.selected_entry = &s->selected_entry;
3115 	s->thread_args.searching = &view->searching;
3116 	s->thread_args.search_next_done = &view->search_next_done;
3117 	s->thread_args.regex = &view->regex;
3118 done:
3119 	if (err)
3120 		close_log_view(view);
3121 	return err;
3122 }
3123 
3124 static const struct got_error *
3125 show_log_view(struct tog_view *view)
3126 {
3127 	const struct got_error *err;
3128 	struct tog_log_view_state *s = &view->state.log;
3129 
3130 	if (s->thread == 0) { //NULL) {
3131 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3132 		    &s->thread_args);
3133 		if (errcode)
3134 			return got_error_set_errno(errcode, "pthread_create");
3135 		if (s->thread_args.commits_needed > 0) {
3136 			err = trigger_log_thread(view, 1);
3137 			if (err)
3138 				return err;
3139 		}
3140 	}
3141 
3142 	return draw_commits(view);
3143 }
3144 
3145 static void
3146 log_move_cursor_up(struct tog_view *view, int page, int home)
3147 {
3148 	struct tog_log_view_state *s = &view->state.log;
3149 
3150 	if (s->selected_entry->idx == 0)
3151 		view->count = 0;
3152 	if (s->first_displayed_entry == NULL)
3153 		return;
3154 
3155 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3156 	    || home)
3157 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3158 
3159 	if (!page && !home && s->selected > 0)
3160 		--s->selected;
3161 	else
3162 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3163 
3164 	select_commit(s);
3165 	return;
3166 }
3167 
3168 static const struct got_error *
3169 log_move_cursor_down(struct tog_view *view, int page)
3170 {
3171 	struct tog_log_view_state	*s = &view->state.log;
3172 	const struct got_error		*err = NULL;
3173 
3174 	if (s->thread_args.log_complete &&
3175 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3176 		return NULL;
3177 
3178 	if (!page) {
3179 		int eos = view->nlines - 2;
3180 
3181 		if (view_is_hsplit_top(view))
3182 			--eos;  /* border consumes the last line */
3183 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3184 			++s->selected;
3185 		else
3186 			err = log_scroll_down(view, 1);
3187 	} else if (s->thread_args.load_all) {
3188 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3189 			s->selected += MIN(s->last_displayed_entry->idx -
3190 			    s->selected_entry->idx, page + 1);
3191 		else
3192 			err = log_scroll_down(view, MIN(page,
3193 			    s->commits.ncommits - s->selected_entry->idx - 1));
3194 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3195 	} else {
3196 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1 &&
3197 		    s->thread_args.log_complete)
3198 			s->selected += MIN(page,
3199 			    s->commits.ncommits - s->selected_entry->idx - 1);
3200 		else
3201 			err = log_scroll_down(view, page);
3202 	}
3203 	if (err)
3204 		return err;
3205 
3206 	/*
3207 	 * We might necessarily overshoot in horizontal
3208 	 * splits; if so, select the last displayed commit.
3209 	 */
3210 	s->selected = MIN(s->selected,
3211 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3212 
3213 	select_commit(s);
3214 
3215 	if (s->thread_args.log_complete &&
3216 	    s->selected_entry->idx == s->commits.ncommits - 1)
3217 		view->count = 0;
3218 
3219 	return NULL;
3220 }
3221 
3222 static void
3223 view_get_split(struct tog_view *view, int *y, int *x)
3224 {
3225 	*x = 0;
3226 	*y = 0;
3227 
3228 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3229 		if (view->child && view->child->resized_y)
3230 			*y = view->child->resized_y;
3231 		else if (view->resized_y)
3232 			*y = view->resized_y;
3233 		else
3234 			*y = view_split_begin_y(view->lines);
3235 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3236 		if (view->child && view->child->resized_x)
3237 			*x = view->child->resized_x;
3238 		else if (view->resized_x)
3239 			*x = view->resized_x;
3240 		else
3241 			*x = view_split_begin_x(view->begin_x);
3242 	}
3243 }
3244 
3245 /* Split view horizontally at y and offset view->state->selected line. */
3246 static const struct got_error *
3247 view_init_hsplit(struct tog_view *view, int y)
3248 {
3249 	const struct got_error *err = NULL;
3250 
3251 	view->nlines = y;
3252 	view->ncols = COLS;
3253 	err = view_resize(view);
3254 	if (err)
3255 		return err;
3256 
3257 	err = offset_selection_down(view);
3258 
3259 	return err;
3260 }
3261 
3262 static const struct got_error *
3263 log_goto_line(struct tog_view *view, int nlines)
3264 {
3265 	const struct got_error		*err = NULL;
3266 	struct tog_log_view_state	*s = &view->state.log;
3267 	int				 g, idx = s->selected_entry->idx;
3268 
3269 	g = view->gline;
3270 	view->gline = 0;
3271 
3272 	if (g >= s->first_displayed_entry->idx + 1 &&
3273 	    g <= s->last_displayed_entry->idx + 1 &&
3274 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3275 		s->selected = g - s->first_displayed_entry->idx - 1;
3276 		select_commit(s);
3277 		return NULL;
3278 	}
3279 
3280 	if (idx + 1 < g) {
3281 		err = log_move_cursor_down(view, g - idx - 1);
3282 		if (!err && g > s->selected_entry->idx + 1)
3283 			err = log_move_cursor_down(view,
3284 			    g - s->first_displayed_entry->idx - 1);
3285 		if (err)
3286 			return err;
3287 	} else if (idx + 1 > g)
3288 		log_move_cursor_up(view, idx - g + 1, 0);
3289 
3290 	if (g < nlines && s->first_displayed_entry->idx == 0)
3291 		s->selected = g - 1;
3292 
3293 	select_commit(s);
3294 	return NULL;
3295 
3296 }
3297 
3298 static const struct got_error *
3299 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3300 {
3301 	const struct got_error *err = NULL;
3302 	struct tog_log_view_state *s = &view->state.log;
3303 	struct commit_queue_entry *entry;
3304 	int eos, n, nscroll;
3305 
3306 	if (s->thread_args.load_all) {
3307 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3308 			s->thread_args.load_all = 0;
3309 		else if (s->thread_args.log_complete) {
3310 			err = log_move_cursor_down(view, s->commits.ncommits);
3311 			s->thread_args.load_all = 0;
3312 		}
3313 		return err;
3314 	}
3315 
3316 	eos = nscroll = view->nlines - 1;
3317 	if (view_is_hsplit_top(view))
3318 		--eos;  /* border */
3319 
3320 	if (view->gline)
3321 		return log_goto_line(view, eos);
3322 
3323 	switch (ch) {
3324 	case 'q':
3325 		s->quit = 1;
3326 		break;
3327 	case '0':
3328 		view->x = 0;
3329 		break;
3330 	case '$':
3331 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3332 		view->count = 0;
3333 		break;
3334 	case KEY_RIGHT:
3335 	case 'l':
3336 		if (view->x + view->ncols / 2 < view->maxx)
3337 			view->x += 2;  /* move two columns right */
3338 		else
3339 			view->count = 0;
3340 		break;
3341 	case KEY_LEFT:
3342 	case 'h':
3343 		view->x -= MIN(view->x, 2);  /* move two columns back */
3344 		if (view->x <= 0)
3345 			view->count = 0;
3346 		break;
3347 	case 'k':
3348 	case KEY_UP:
3349 	case '<':
3350 	case ',':
3351 	case CTRL('p'):
3352 		log_move_cursor_up(view, 0, 0);
3353 		break;
3354 	case 'g':
3355 	case KEY_HOME:
3356 		log_move_cursor_up(view, 0, 1);
3357 		view->count = 0;
3358 		break;
3359 	case CTRL('u'):
3360 	case 'u':
3361 		nscroll /= 2;
3362 		/* FALL THROUGH */
3363 	case KEY_PPAGE:
3364 	case CTRL('b'):
3365 	case 'b':
3366 		log_move_cursor_up(view, nscroll, 0);
3367 		break;
3368 	case 'j':
3369 	case KEY_DOWN:
3370 	case '>':
3371 	case '.':
3372 	case CTRL('n'):
3373 		err = log_move_cursor_down(view, 0);
3374 		break;
3375 	case '@':
3376 		s->use_committer = !s->use_committer;
3377 		break;
3378 	case 'G':
3379 	case KEY_END: {
3380 		/* We don't know yet how many commits, so we're forced to
3381 		 * traverse them all. */
3382 		view->count = 0;
3383 		if (!s->thread_args.log_complete) {
3384 			s->thread_args.load_all = 1;
3385 			return trigger_log_thread(view, 0);
3386 		}
3387 
3388 		s->selected = 0;
3389 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3390 		for (n = 0; n < eos; n++) {
3391 			if (entry == NULL)
3392 				break;
3393 			s->first_displayed_entry = entry;
3394 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3395 		}
3396 		if (n > 0)
3397 			s->selected = n - 1;
3398 		select_commit(s);
3399 		break;
3400 	}
3401 	case CTRL('d'):
3402 	case 'd':
3403 		nscroll /= 2;
3404 		/* FALL THROUGH */
3405 	case KEY_NPAGE:
3406 	case CTRL('f'):
3407 	case 'f':
3408 	case ' ':
3409 		err = log_move_cursor_down(view, nscroll);
3410 		break;
3411 	case KEY_RESIZE:
3412 		if (s->selected > view->nlines - 2)
3413 			s->selected = view->nlines - 2;
3414 		if (s->selected > s->commits.ncommits - 1)
3415 			s->selected = s->commits.ncommits - 1;
3416 		select_commit(s);
3417 		if (s->commits.ncommits < view->nlines - 1 &&
3418 		    !s->thread_args.log_complete) {
3419 			s->thread_args.commits_needed += (view->nlines - 1) -
3420 			    s->commits.ncommits;
3421 			err = trigger_log_thread(view, 1);
3422 		}
3423 		break;
3424 	case KEY_ENTER:
3425 	case '\r':
3426 		view->count = 0;
3427 		if (s->selected_entry == NULL)
3428 			break;
3429 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3430 		break;
3431 	case 'T':
3432 		view->count = 0;
3433 		if (s->selected_entry == NULL)
3434 			break;
3435 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3436 		break;
3437 	case KEY_BACKSPACE:
3438 	case CTRL('l'):
3439 	case 'B':
3440 		view->count = 0;
3441 		if (ch == KEY_BACKSPACE &&
3442 		    got_path_is_root_dir(s->in_repo_path))
3443 			break;
3444 		err = stop_log_thread(s);
3445 		if (err)
3446 			return err;
3447 		if (ch == KEY_BACKSPACE) {
3448 			char *parent_path;
3449 			err = got_path_dirname(&parent_path, s->in_repo_path);
3450 			if (err)
3451 				return err;
3452 			free(s->in_repo_path);
3453 			s->in_repo_path = parent_path;
3454 			s->thread_args.in_repo_path = s->in_repo_path;
3455 		} else if (ch == CTRL('l')) {
3456 			struct got_object_id *start_id;
3457 			err = got_repo_match_object_id(&start_id, NULL,
3458 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3459 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3460 			if (err)
3461 				return err;
3462 			free(s->start_id);
3463 			s->start_id = start_id;
3464 			s->thread_args.start_id = s->start_id;
3465 		} else /* 'B' */
3466 			s->log_branches = !s->log_branches;
3467 
3468 		if (s->thread_args.pack_fds == NULL) {
3469 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3470 			if (err)
3471 				return err;
3472 		}
3473 		err = got_repo_open(&s->thread_args.repo,
3474 		    got_repo_get_path(s->repo), NULL,
3475 		    s->thread_args.pack_fds);
3476 		if (err)
3477 			return err;
3478 		tog_free_refs();
3479 		err = tog_load_refs(s->repo, 0);
3480 		if (err)
3481 			return err;
3482 		err = got_commit_graph_open(&s->thread_args.graph,
3483 		    s->in_repo_path, !s->log_branches);
3484 		if (err)
3485 			return err;
3486 		err = got_commit_graph_iter_start(s->thread_args.graph,
3487 		    s->start_id, s->repo, NULL, NULL);
3488 		if (err)
3489 			return err;
3490 		free_commits(&s->commits);
3491 		s->first_displayed_entry = NULL;
3492 		s->last_displayed_entry = NULL;
3493 		s->selected_entry = NULL;
3494 		s->selected = 0;
3495 		s->thread_args.log_complete = 0;
3496 		s->quit = 0;
3497 		s->thread_args.commits_needed = view->lines;
3498 		s->matched_entry = NULL;
3499 		s->search_entry = NULL;
3500 		view->offset = 0;
3501 		break;
3502 	case 'R':
3503 		view->count = 0;
3504 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3505 		break;
3506 	default:
3507 		view->count = 0;
3508 		break;
3509 	}
3510 
3511 	return err;
3512 }
3513 
3514 static const struct got_error *
3515 apply_unveil(const char *repo_path, const char *worktree_path)
3516 {
3517 	const struct got_error *error;
3518 
3519 #ifdef PROFILE
3520 	if (unveil("gmon.out", "rwc") != 0)
3521 		return got_error_from_errno2("unveil", "gmon.out");
3522 #endif
3523 	if (repo_path && unveil(repo_path, "r") != 0)
3524 		return got_error_from_errno2("unveil", repo_path);
3525 
3526 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3527 		return got_error_from_errno2("unveil", worktree_path);
3528 
3529 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3530 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3531 
3532 	error = got_privsep_unveil_exec_helpers();
3533 	if (error != NULL)
3534 		return error;
3535 
3536 	if (unveil(NULL, NULL) != 0)
3537 		return got_error_from_errno("unveil");
3538 
3539 	return NULL;
3540 }
3541 
3542 static void
3543 init_curses(void)
3544 {
3545 	/*
3546 	 * Override default signal handlers before starting ncurses.
3547 	 * This should prevent ncurses from installing its own
3548 	 * broken cleanup() signal handler.
3549 	 */
3550 	signal(SIGWINCH, tog_sigwinch);
3551 	signal(SIGPIPE, tog_sigpipe);
3552 	signal(SIGCONT, tog_sigcont);
3553 	signal(SIGINT, tog_sigint);
3554 	signal(SIGTERM, tog_sigterm);
3555 
3556 	initscr();
3557 	cbreak();
3558 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3559 	noecho();
3560 	nonl();
3561 	intrflush(stdscr, FALSE);
3562 	keypad(stdscr, TRUE);
3563 	curs_set(0);
3564 	if (getenv("TOG_COLORS") != NULL) {
3565 		start_color();
3566 		use_default_colors();
3567 	}
3568 }
3569 
3570 static const struct got_error *
3571 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3572     struct got_repository *repo, struct got_worktree *worktree)
3573 {
3574 	const struct got_error *err = NULL;
3575 
3576 	if (argc == 0) {
3577 		*in_repo_path = strdup("/");
3578 		if (*in_repo_path == NULL)
3579 			return got_error_from_errno("strdup");
3580 		return NULL;
3581 	}
3582 
3583 	if (worktree) {
3584 		const char *prefix = got_worktree_get_path_prefix(worktree);
3585 		char *p;
3586 
3587 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3588 		if (err)
3589 			return err;
3590 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3591 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3592 		    p) == -1) {
3593 			err = got_error_from_errno("asprintf");
3594 			*in_repo_path = NULL;
3595 		}
3596 		free(p);
3597 	} else
3598 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3599 
3600 	return err;
3601 }
3602 
3603 static const struct got_error *
3604 cmd_log(int argc, char *argv[])
3605 {
3606 	const struct got_error *error;
3607 	struct got_repository *repo = NULL;
3608 	struct got_worktree *worktree = NULL;
3609 	struct got_object_id *start_id = NULL;
3610 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3611 	char *start_commit = NULL, *label = NULL;
3612 	struct got_reference *ref = NULL;
3613 	const char *head_ref_name = NULL;
3614 	int ch, log_branches = 0;
3615 	struct tog_view *view;
3616 	int *pack_fds = NULL;
3617 
3618 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3619 		switch (ch) {
3620 		case 'b':
3621 			log_branches = 1;
3622 			break;
3623 		case 'c':
3624 			start_commit = optarg;
3625 			break;
3626 		case 'r':
3627 			repo_path = realpath(optarg, NULL);
3628 			if (repo_path == NULL)
3629 				return got_error_from_errno2("realpath",
3630 				    optarg);
3631 			break;
3632 		default:
3633 			usage_log();
3634 			/* NOTREACHED */
3635 		}
3636 	}
3637 
3638 	argc -= optind;
3639 	argv += optind;
3640 
3641 	if (argc > 1)
3642 		usage_log();
3643 
3644 	error = got_repo_pack_fds_open(&pack_fds);
3645 	if (error != NULL)
3646 		goto done;
3647 
3648 	if (repo_path == NULL) {
3649 		cwd = getcwd(NULL, 0);
3650 		if (cwd == NULL)
3651 			return got_error_from_errno("getcwd");
3652 		error = got_worktree_open(&worktree, cwd);
3653 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3654 			goto done;
3655 		if (worktree)
3656 			repo_path =
3657 			    strdup(got_worktree_get_repo_path(worktree));
3658 		else
3659 			repo_path = strdup(cwd);
3660 		if (repo_path == NULL) {
3661 			error = got_error_from_errno("strdup");
3662 			goto done;
3663 		}
3664 	}
3665 
3666 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3667 	if (error != NULL)
3668 		goto done;
3669 
3670 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3671 	    repo, worktree);
3672 	if (error)
3673 		goto done;
3674 
3675 	init_curses();
3676 
3677 	error = apply_unveil(got_repo_get_path(repo),
3678 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3679 	if (error)
3680 		goto done;
3681 
3682 	/* already loaded by tog_log_with_path()? */
3683 	if (TAILQ_EMPTY(&tog_refs)) {
3684 		error = tog_load_refs(repo, 0);
3685 		if (error)
3686 			goto done;
3687 	}
3688 
3689 	if (start_commit == NULL) {
3690 		error = got_repo_match_object_id(&start_id, &label,
3691 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3692 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3693 		if (error)
3694 			goto done;
3695 		head_ref_name = label;
3696 	} else {
3697 		error = got_ref_open(&ref, repo, start_commit, 0);
3698 		if (error == NULL)
3699 			head_ref_name = got_ref_get_name(ref);
3700 		else if (error->code != GOT_ERR_NOT_REF)
3701 			goto done;
3702 		error = got_repo_match_object_id(&start_id, NULL,
3703 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3704 		if (error)
3705 			goto done;
3706 	}
3707 
3708 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3709 	if (view == NULL) {
3710 		error = got_error_from_errno("view_open");
3711 		goto done;
3712 	}
3713 	error = open_log_view(view, start_id, repo, head_ref_name,
3714 	    in_repo_path, log_branches);
3715 	if (error)
3716 		goto done;
3717 	if (worktree) {
3718 		/* Release work tree lock. */
3719 		got_worktree_close(worktree);
3720 		worktree = NULL;
3721 	}
3722 	error = view_loop(view);
3723 done:
3724 	free(in_repo_path);
3725 	free(repo_path);
3726 	free(cwd);
3727 	free(start_id);
3728 	free(label);
3729 	if (ref)
3730 		got_ref_close(ref);
3731 	if (repo) {
3732 		const struct got_error *close_err = got_repo_close(repo);
3733 		if (error == NULL)
3734 			error = close_err;
3735 	}
3736 	if (worktree)
3737 		got_worktree_close(worktree);
3738 	if (pack_fds) {
3739 		const struct got_error *pack_err =
3740 		    got_repo_pack_fds_close(pack_fds);
3741 		if (error == NULL)
3742 			error = pack_err;
3743 	}
3744 	tog_free_refs();
3745 	return error;
3746 }
3747 
3748 __dead static void
3749 usage_diff(void)
3750 {
3751 	endwin();
3752 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3753 	    "[-w] object1 object2\n", getprogname());
3754 	exit(1);
3755 }
3756 
3757 static int
3758 match_line(const char *line, regex_t *regex, size_t nmatch,
3759     regmatch_t *regmatch)
3760 {
3761 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3762 }
3763 
3764 static struct tog_color *
3765 match_color(struct tog_colors *colors, const char *line)
3766 {
3767 	struct tog_color *tc = NULL;
3768 
3769 	STAILQ_FOREACH(tc, colors, entry) {
3770 		if (match_line(line, &tc->regex, 0, NULL))
3771 			return tc;
3772 	}
3773 
3774 	return NULL;
3775 }
3776 
3777 static const struct got_error *
3778 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3779     WINDOW *window, int skipcol, regmatch_t *regmatch)
3780 {
3781 	const struct got_error *err = NULL;
3782 	char *exstr = NULL;
3783 	wchar_t *wline = NULL;
3784 	int rme, rms, n, width, scrollx;
3785 	int width0 = 0, width1 = 0, width2 = 0;
3786 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3787 
3788 	*wtotal = 0;
3789 
3790 	rms = regmatch->rm_so;
3791 	rme = regmatch->rm_eo;
3792 
3793 	err = expand_tab(&exstr, line);
3794 	if (err)
3795 		return err;
3796 
3797 	/* Split the line into 3 segments, according to match offsets. */
3798 	seg0 = strndup(exstr, rms);
3799 	if (seg0 == NULL) {
3800 		err = got_error_from_errno("strndup");
3801 		goto done;
3802 	}
3803 	seg1 = strndup(exstr + rms, rme - rms);
3804 	if (seg1 == NULL) {
3805 		err = got_error_from_errno("strndup");
3806 		goto done;
3807 	}
3808 	seg2 = strdup(exstr + rme);
3809 	if (seg2 == NULL) {
3810 		err = got_error_from_errno("strndup");
3811 		goto done;
3812 	}
3813 
3814 	/* draw up to matched token if we haven't scrolled past it */
3815 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3816 	    col_tab_align, 1);
3817 	if (err)
3818 		goto done;
3819 	n = MAX(width0 - skipcol, 0);
3820 	if (n) {
3821 		free(wline);
3822 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3823 		    wlimit, col_tab_align, 1);
3824 		if (err)
3825 			goto done;
3826 		waddwstr(window, &wline[scrollx]);
3827 		wlimit -= width;
3828 		*wtotal += width;
3829 	}
3830 
3831 	if (wlimit > 0) {
3832 		int i = 0, w = 0;
3833 		size_t wlen;
3834 
3835 		free(wline);
3836 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3837 		    col_tab_align, 1);
3838 		if (err)
3839 			goto done;
3840 		wlen = wcslen(wline);
3841 		while (i < wlen) {
3842 			width = wcwidth(wline[i]);
3843 			if (width == -1) {
3844 				/* should not happen, tabs are expanded */
3845 				err = got_error(GOT_ERR_RANGE);
3846 				goto done;
3847 			}
3848 			if (width0 + w + width > skipcol)
3849 				break;
3850 			w += width;
3851 			i++;
3852 		}
3853 		/* draw (visible part of) matched token (if scrolled into it) */
3854 		if (width1 - w > 0) {
3855 			wattron(window, A_STANDOUT);
3856 			waddwstr(window, &wline[i]);
3857 			wattroff(window, A_STANDOUT);
3858 			wlimit -= (width1 - w);
3859 			*wtotal += (width1 - w);
3860 		}
3861 	}
3862 
3863 	if (wlimit > 0) {  /* draw rest of line */
3864 		free(wline);
3865 		if (skipcol > width0 + width1) {
3866 			err = format_line(&wline, &width2, &scrollx, seg2,
3867 			    skipcol - (width0 + width1), wlimit,
3868 			    col_tab_align, 1);
3869 			if (err)
3870 				goto done;
3871 			waddwstr(window, &wline[scrollx]);
3872 		} else {
3873 			err = format_line(&wline, &width2, NULL, seg2, 0,
3874 			    wlimit, col_tab_align, 1);
3875 			if (err)
3876 				goto done;
3877 			waddwstr(window, wline);
3878 		}
3879 		*wtotal += width2;
3880 	}
3881 done:
3882 	free(wline);
3883 	free(exstr);
3884 	free(seg0);
3885 	free(seg1);
3886 	free(seg2);
3887 	return err;
3888 }
3889 
3890 static int
3891 gotoline(struct tog_view *view, int *lineno, int *nprinted)
3892 {
3893 	FILE	*f = NULL;
3894 	int	*eof, *first, *selected;
3895 
3896 	if (view->type == TOG_VIEW_DIFF) {
3897 		struct tog_diff_view_state *s = &view->state.diff;
3898 
3899 		first = &s->first_displayed_line;
3900 		selected = first;
3901 		eof = &s->eof;
3902 		f = s->f;
3903 	} else if (view->type == TOG_VIEW_BLAME) {
3904 		struct tog_blame_view_state *s = &view->state.blame;
3905 
3906 		first = &s->first_displayed_line;
3907 		selected = &s->selected_line;
3908 		eof = &s->eof;
3909 		f = s->blame.f;
3910 	} else
3911 		return 0;
3912 
3913 	/* Center gline in the middle of the page like vi(1). */
3914 	if (*lineno < view->gline - (view->nlines - 3) / 2)
3915 		return 0;
3916 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
3917 		rewind(f);
3918 		*eof = 0;
3919 		*first = 1;
3920 		*lineno = 0;
3921 		*nprinted = 0;
3922 		return 0;
3923 	}
3924 
3925 	*selected = view->gline <= (view->nlines - 3) / 2 ?
3926 		view->gline : (view->nlines - 3) / 2 + 1;
3927 	view->gline = 0;
3928 
3929 	return 1;
3930 }
3931 
3932 static const struct got_error *
3933 draw_file(struct tog_view *view, const char *header)
3934 {
3935 	struct tog_diff_view_state *s = &view->state.diff;
3936 	regmatch_t *regmatch = &view->regmatch;
3937 	const struct got_error *err;
3938 	int nprinted = 0;
3939 	char *line;
3940 	size_t linesize = 0;
3941 	ssize_t linelen;
3942 	wchar_t *wline;
3943 	int width;
3944 	int max_lines = view->nlines;
3945 	int nlines = s->nlines;
3946 	off_t line_offset;
3947 
3948 	s->lineno = s->first_displayed_line - 1;
3949 	line_offset = s->lines[s->first_displayed_line - 1].offset;
3950 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3951 		return got_error_from_errno("fseek");
3952 
3953 	werase(view->window);
3954 
3955 	if (view->gline > s->nlines - 1)
3956 		view->gline = s->nlines - 1;
3957 
3958 	if (header) {
3959 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
3960 		    1 : view->gline - (view->nlines - 3) / 2 :
3961 		    s->lineno + s->selected_line;
3962 
3963 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
3964 			return got_error_from_errno("asprintf");
3965 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3966 		    0, 0);
3967 		free(line);
3968 		if (err)
3969 			return err;
3970 
3971 		if (view_needs_focus_indication(view))
3972 			wstandout(view->window);
3973 		waddwstr(view->window, wline);
3974 		free(wline);
3975 		wline = NULL;
3976 		if (view_needs_focus_indication(view))
3977 			wstandend(view->window);
3978 		if (width <= view->ncols - 1)
3979 			waddch(view->window, '\n');
3980 
3981 		if (max_lines <= 1)
3982 			return NULL;
3983 		max_lines--;
3984 	}
3985 
3986 	s->eof = 0;
3987 	view->maxx = 0;
3988 	line = NULL;
3989 	while (max_lines > 0 && nprinted < max_lines) {
3990 		enum got_diff_line_type linetype;
3991 		attr_t attr = 0;
3992 
3993 		linelen = getline(&line, &linesize, s->f);
3994 		if (linelen == -1) {
3995 			if (feof(s->f)) {
3996 				s->eof = 1;
3997 				break;
3998 			}
3999 			free(line);
4000 			return got_ferror(s->f, GOT_ERR_IO);
4001 		}
4002 
4003 		if (++s->lineno < s->first_displayed_line)
4004 			continue;
4005 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4006 			continue;
4007 		if (s->lineno == view->hiline)
4008 			attr = A_STANDOUT;
4009 
4010 		/* Set view->maxx based on full line length. */
4011 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4012 		    view->x ? 1 : 0);
4013 		if (err) {
4014 			free(line);
4015 			return err;
4016 		}
4017 		view->maxx = MAX(view->maxx, width);
4018 		free(wline);
4019 		wline = NULL;
4020 
4021 		linetype = s->lines[s->lineno].type;
4022 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4023 		    linetype < GOT_DIFF_LINE_CONTEXT)
4024 			attr |= COLOR_PAIR(linetype);
4025 		if (attr)
4026 			wattron(view->window, attr);
4027 		if (s->first_displayed_line + nprinted == s->matched_line &&
4028 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4029 			err = add_matched_line(&width, line, view->ncols, 0,
4030 			    view->window, view->x, regmatch);
4031 			if (err) {
4032 				free(line);
4033 				return err;
4034 			}
4035 		} else {
4036 			int skip;
4037 			err = format_line(&wline, &width, &skip, line,
4038 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4039 			if (err) {
4040 				free(line);
4041 				return err;
4042 			}
4043 			waddwstr(view->window, &wline[skip]);
4044 			free(wline);
4045 			wline = NULL;
4046 		}
4047 		if (s->lineno == view->hiline) {
4048 			/* highlight full gline length */
4049 			while (width++ < view->ncols)
4050 				waddch(view->window, ' ');
4051 		} else {
4052 			if (width <= view->ncols - 1)
4053 				waddch(view->window, '\n');
4054 		}
4055 		if (attr)
4056 			wattroff(view->window, attr);
4057 		if (++nprinted == 1)
4058 			s->first_displayed_line = s->lineno;
4059 	}
4060 	free(line);
4061 	if (nprinted >= 1)
4062 		s->last_displayed_line = s->first_displayed_line +
4063 		    (nprinted - 1);
4064 	else
4065 		s->last_displayed_line = s->first_displayed_line;
4066 
4067 	view_border(view);
4068 
4069 	if (s->eof) {
4070 		while (nprinted < view->nlines) {
4071 			waddch(view->window, '\n');
4072 			nprinted++;
4073 		}
4074 
4075 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4076 		    view->ncols, 0, 0);
4077 		if (err) {
4078 			return err;
4079 		}
4080 
4081 		wstandout(view->window);
4082 		waddwstr(view->window, wline);
4083 		free(wline);
4084 		wline = NULL;
4085 		wstandend(view->window);
4086 	}
4087 
4088 	return NULL;
4089 }
4090 
4091 static char *
4092 get_datestr(time_t *time, char *datebuf)
4093 {
4094 	struct tm mytm, *tm;
4095 	char *p, *s;
4096 
4097 	tm = gmtime_r(time, &mytm);
4098 	if (tm == NULL)
4099 		return NULL;
4100 	s = asctime_r(tm, datebuf);
4101 	if (s == NULL)
4102 		return NULL;
4103 	p = strchr(s, '\n');
4104 	if (p)
4105 		*p = '\0';
4106 	return s;
4107 }
4108 
4109 static const struct got_error *
4110 get_changed_paths(struct got_pathlist_head *paths,
4111     struct got_commit_object *commit, struct got_repository *repo)
4112 {
4113 	const struct got_error *err = NULL;
4114 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4115 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4116 	struct got_object_qid *qid;
4117 
4118 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4119 	if (qid != NULL) {
4120 		struct got_commit_object *pcommit;
4121 		err = got_object_open_as_commit(&pcommit, repo,
4122 		    &qid->id);
4123 		if (err)
4124 			return err;
4125 
4126 		tree_id1 = got_object_id_dup(
4127 		    got_object_commit_get_tree_id(pcommit));
4128 		if (tree_id1 == NULL) {
4129 			got_object_commit_close(pcommit);
4130 			return got_error_from_errno("got_object_id_dup");
4131 		}
4132 		got_object_commit_close(pcommit);
4133 
4134 	}
4135 
4136 	if (tree_id1) {
4137 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4138 		if (err)
4139 			goto done;
4140 	}
4141 
4142 	tree_id2 = got_object_commit_get_tree_id(commit);
4143 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4144 	if (err)
4145 		goto done;
4146 
4147 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4148 	    got_diff_tree_collect_changed_paths, paths, 0);
4149 done:
4150 	if (tree1)
4151 		got_object_tree_close(tree1);
4152 	if (tree2)
4153 		got_object_tree_close(tree2);
4154 	free(tree_id1);
4155 	return err;
4156 }
4157 
4158 static const struct got_error *
4159 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4160     off_t off, uint8_t type)
4161 {
4162 	struct got_diff_line *p;
4163 
4164 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4165 	if (p == NULL)
4166 		return got_error_from_errno("reallocarray");
4167 	*lines = p;
4168 	(*lines)[*nlines].offset = off;
4169 	(*lines)[*nlines].type = type;
4170 	(*nlines)++;
4171 
4172 	return NULL;
4173 }
4174 
4175 static const struct got_error *
4176 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4177     struct got_object_id *commit_id, struct got_reflist_head *refs,
4178     struct got_repository *repo, FILE *outfile)
4179 {
4180 	const struct got_error *err = NULL;
4181 	char datebuf[26], *datestr;
4182 	struct got_commit_object *commit;
4183 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4184 	time_t committer_time;
4185 	const char *author, *committer;
4186 	char *refs_str = NULL;
4187 	struct got_pathlist_head changed_paths;
4188 	struct got_pathlist_entry *pe;
4189 	off_t outoff = 0;
4190 	int n;
4191 
4192 	TAILQ_INIT(&changed_paths);
4193 
4194 	if (refs) {
4195 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4196 		if (err)
4197 			return err;
4198 	}
4199 
4200 	err = got_object_open_as_commit(&commit, repo, commit_id);
4201 	if (err)
4202 		return err;
4203 
4204 	err = got_object_id_str(&id_str, commit_id);
4205 	if (err) {
4206 		err = got_error_from_errno("got_object_id_str");
4207 		goto done;
4208 	}
4209 
4210 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4211 	if (err)
4212 		goto done;
4213 
4214 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4215 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4216 	if (n < 0) {
4217 		err = got_error_from_errno("fprintf");
4218 		goto done;
4219 	}
4220 	outoff += n;
4221 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4222 	if (err)
4223 		goto done;
4224 
4225 	n = fprintf(outfile, "from: %s\n",
4226 	    got_object_commit_get_author(commit));
4227 	if (n < 0) {
4228 		err = got_error_from_errno("fprintf");
4229 		goto done;
4230 	}
4231 	outoff += n;
4232 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4233 	if (err)
4234 		goto done;
4235 
4236 	committer_time = got_object_commit_get_committer_time(commit);
4237 	datestr = get_datestr(&committer_time, datebuf);
4238 	if (datestr) {
4239 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4240 		if (n < 0) {
4241 			err = got_error_from_errno("fprintf");
4242 			goto done;
4243 		}
4244 		outoff += n;
4245 		err = add_line_metadata(lines, nlines, outoff,
4246 		    GOT_DIFF_LINE_DATE);
4247 		if (err)
4248 			goto done;
4249 	}
4250 	author = got_object_commit_get_author(commit);
4251 	committer = got_object_commit_get_committer(commit);
4252 	if (strcmp(author, committer) != 0) {
4253 		n = fprintf(outfile, "via: %s\n", committer);
4254 		if (n < 0) {
4255 			err = got_error_from_errno("fprintf");
4256 			goto done;
4257 		}
4258 		outoff += n;
4259 		err = add_line_metadata(lines, nlines, outoff,
4260 		    GOT_DIFF_LINE_AUTHOR);
4261 		if (err)
4262 			goto done;
4263 	}
4264 	if (got_object_commit_get_nparents(commit) > 1) {
4265 		const struct got_object_id_queue *parent_ids;
4266 		struct got_object_qid *qid;
4267 		int pn = 1;
4268 		parent_ids = got_object_commit_get_parent_ids(commit);
4269 		STAILQ_FOREACH(qid, parent_ids, entry) {
4270 			err = got_object_id_str(&id_str, &qid->id);
4271 			if (err)
4272 				goto done;
4273 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4274 			if (n < 0) {
4275 				err = got_error_from_errno("fprintf");
4276 				goto done;
4277 			}
4278 			outoff += n;
4279 			err = add_line_metadata(lines, nlines, outoff,
4280 			    GOT_DIFF_LINE_META);
4281 			if (err)
4282 				goto done;
4283 			free(id_str);
4284 			id_str = NULL;
4285 		}
4286 	}
4287 
4288 	err = got_object_commit_get_logmsg(&logmsg, commit);
4289 	if (err)
4290 		goto done;
4291 	s = logmsg;
4292 	while ((line = strsep(&s, "\n")) != NULL) {
4293 		n = fprintf(outfile, "%s\n", line);
4294 		if (n < 0) {
4295 			err = got_error_from_errno("fprintf");
4296 			goto done;
4297 		}
4298 		outoff += n;
4299 		err = add_line_metadata(lines, nlines, outoff,
4300 		    GOT_DIFF_LINE_LOGMSG);
4301 		if (err)
4302 			goto done;
4303 	}
4304 
4305 	err = get_changed_paths(&changed_paths, commit, repo);
4306 	if (err)
4307 		goto done;
4308 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4309 		struct got_diff_changed_path *cp = pe->data;
4310 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4311 		if (n < 0) {
4312 			err = got_error_from_errno("fprintf");
4313 			goto done;
4314 		}
4315 		outoff += n;
4316 		err = add_line_metadata(lines, nlines, outoff,
4317 		    GOT_DIFF_LINE_CHANGES);
4318 		if (err)
4319 			goto done;
4320 		free((char *)pe->path);
4321 		free(pe->data);
4322 	}
4323 
4324 	fputc('\n', outfile);
4325 	outoff++;
4326 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4327 done:
4328 	got_pathlist_free(&changed_paths);
4329 	free(id_str);
4330 	free(logmsg);
4331 	free(refs_str);
4332 	got_object_commit_close(commit);
4333 	if (err) {
4334 		free(*lines);
4335 		*lines = NULL;
4336 		*nlines = 0;
4337 	}
4338 	return err;
4339 }
4340 
4341 static const struct got_error *
4342 create_diff(struct tog_diff_view_state *s)
4343 {
4344 	const struct got_error *err = NULL;
4345 	FILE *f = NULL;
4346 	int obj_type;
4347 
4348 	free(s->lines);
4349 	s->lines = malloc(sizeof(*s->lines));
4350 	if (s->lines == NULL)
4351 		return got_error_from_errno("malloc");
4352 	s->nlines = 0;
4353 
4354 	f = got_opentemp();
4355 	if (f == NULL) {
4356 		err = got_error_from_errno("got_opentemp");
4357 		goto done;
4358 	}
4359 	if (s->f && fclose(s->f) == EOF) {
4360 		err = got_error_from_errno("fclose");
4361 		goto done;
4362 	}
4363 	s->f = f;
4364 
4365 	if (s->id1)
4366 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4367 	else
4368 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4369 	if (err)
4370 		goto done;
4371 
4372 	switch (obj_type) {
4373 	case GOT_OBJ_TYPE_BLOB:
4374 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4375 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4376 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4377 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4378 		break;
4379 	case GOT_OBJ_TYPE_TREE:
4380 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4381 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4382 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4383 		    s->force_text_diff, s->repo, s->f);
4384 		break;
4385 	case GOT_OBJ_TYPE_COMMIT: {
4386 		const struct got_object_id_queue *parent_ids;
4387 		struct got_object_qid *pid;
4388 		struct got_commit_object *commit2;
4389 		struct got_reflist_head *refs;
4390 
4391 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4392 		if (err)
4393 			goto done;
4394 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4395 		/* Show commit info if we're diffing to a parent/root commit. */
4396 		if (s->id1 == NULL) {
4397 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4398 			    refs, s->repo, s->f);
4399 			if (err)
4400 				goto done;
4401 		} else {
4402 			parent_ids = got_object_commit_get_parent_ids(commit2);
4403 			STAILQ_FOREACH(pid, parent_ids, entry) {
4404 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4405 					err = write_commit_info(&s->lines,
4406 					    &s->nlines, s->id2, refs, s->repo,
4407 					    s->f);
4408 					if (err)
4409 						goto done;
4410 					break;
4411 				}
4412 			}
4413 		}
4414 		got_object_commit_close(commit2);
4415 
4416 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4417 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4418 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4419 		    s->force_text_diff, s->repo, s->f);
4420 		break;
4421 	}
4422 	default:
4423 		err = got_error(GOT_ERR_OBJ_TYPE);
4424 		break;
4425 	}
4426 done:
4427 	if (s->f && fflush(s->f) != 0 && err == NULL)
4428 		err = got_error_from_errno("fflush");
4429 	return err;
4430 }
4431 
4432 static void
4433 diff_view_indicate_progress(struct tog_view *view)
4434 {
4435 	mvwaddstr(view->window, 0, 0, "diffing...");
4436 	update_panels();
4437 	doupdate();
4438 }
4439 
4440 static const struct got_error *
4441 search_start_diff_view(struct tog_view *view)
4442 {
4443 	struct tog_diff_view_state *s = &view->state.diff;
4444 
4445 	s->matched_line = 0;
4446 	return NULL;
4447 }
4448 
4449 static const struct got_error *
4450 search_next_diff_view(struct tog_view *view)
4451 {
4452 	struct tog_diff_view_state *s = &view->state.diff;
4453 	const struct got_error *err = NULL;
4454 	int lineno;
4455 	char *line = NULL;
4456 	size_t linesize = 0;
4457 	ssize_t linelen;
4458 
4459 	if (!view->searching) {
4460 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4461 		return NULL;
4462 	}
4463 
4464 	if (s->matched_line) {
4465 		if (view->searching == TOG_SEARCH_FORWARD)
4466 			lineno = s->matched_line + 1;
4467 		else
4468 			lineno = s->matched_line - 1;
4469 	} else
4470 		lineno = s->first_displayed_line;
4471 
4472 	while (1) {
4473 		off_t offset;
4474 
4475 		if (lineno <= 0 || lineno > s->nlines) {
4476 			if (s->matched_line == 0) {
4477 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4478 				break;
4479 			}
4480 
4481 			if (view->searching == TOG_SEARCH_FORWARD)
4482 				lineno = 1;
4483 			else
4484 				lineno = s->nlines;
4485 		}
4486 
4487 		offset = s->lines[lineno - 1].offset;
4488 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4489 			free(line);
4490 			return got_error_from_errno("fseeko");
4491 		}
4492 		linelen = getline(&line, &linesize, s->f);
4493 		if (linelen != -1) {
4494 			char *exstr;
4495 			err = expand_tab(&exstr, line);
4496 			if (err)
4497 				break;
4498 			if (match_line(exstr, &view->regex, 1,
4499 			    &view->regmatch)) {
4500 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4501 				s->matched_line = lineno;
4502 				free(exstr);
4503 				break;
4504 			}
4505 			free(exstr);
4506 		}
4507 		if (view->searching == TOG_SEARCH_FORWARD)
4508 			lineno++;
4509 		else
4510 			lineno--;
4511 	}
4512 	free(line);
4513 
4514 	if (s->matched_line) {
4515 		s->first_displayed_line = s->matched_line;
4516 		s->selected_line = 1;
4517 	}
4518 
4519 	return err;
4520 }
4521 
4522 static const struct got_error *
4523 close_diff_view(struct tog_view *view)
4524 {
4525 	const struct got_error *err = NULL;
4526 	struct tog_diff_view_state *s = &view->state.diff;
4527 
4528 	free(s->id1);
4529 	s->id1 = NULL;
4530 	free(s->id2);
4531 	s->id2 = NULL;
4532 	if (s->f && fclose(s->f) == EOF)
4533 		err = got_error_from_errno("fclose");
4534 	s->f = NULL;
4535 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4536 		err = got_error_from_errno("fclose");
4537 	s->f1 = NULL;
4538 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4539 		err = got_error_from_errno("fclose");
4540 	s->f2 = NULL;
4541 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4542 		err = got_error_from_errno("close");
4543 	s->fd1 = -1;
4544 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4545 		err = got_error_from_errno("close");
4546 	s->fd2 = -1;
4547 	free(s->lines);
4548 	s->lines = NULL;
4549 	s->nlines = 0;
4550 	return err;
4551 }
4552 
4553 static const struct got_error *
4554 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4555     struct got_object_id *id2, const char *label1, const char *label2,
4556     int diff_context, int ignore_whitespace, int force_text_diff,
4557     struct tog_view *parent_view, struct got_repository *repo)
4558 {
4559 	const struct got_error *err;
4560 	struct tog_diff_view_state *s = &view->state.diff;
4561 
4562 	memset(s, 0, sizeof(*s));
4563 	s->fd1 = -1;
4564 	s->fd2 = -1;
4565 
4566 	if (id1 != NULL && id2 != NULL) {
4567 	    int type1, type2;
4568 	    err = got_object_get_type(&type1, repo, id1);
4569 	    if (err)
4570 		return err;
4571 	    err = got_object_get_type(&type2, repo, id2);
4572 	    if (err)
4573 		return err;
4574 
4575 	    if (type1 != type2)
4576 		return got_error(GOT_ERR_OBJ_TYPE);
4577 	}
4578 	s->first_displayed_line = 1;
4579 	s->last_displayed_line = view->nlines;
4580 	s->selected_line = 1;
4581 	s->repo = repo;
4582 	s->id1 = id1;
4583 	s->id2 = id2;
4584 	s->label1 = label1;
4585 	s->label2 = label2;
4586 
4587 	if (id1) {
4588 		s->id1 = got_object_id_dup(id1);
4589 		if (s->id1 == NULL)
4590 			return got_error_from_errno("got_object_id_dup");
4591 	} else
4592 		s->id1 = NULL;
4593 
4594 	s->id2 = got_object_id_dup(id2);
4595 	if (s->id2 == NULL) {
4596 		err = got_error_from_errno("got_object_id_dup");
4597 		goto done;
4598 	}
4599 
4600 	s->f1 = got_opentemp();
4601 	if (s->f1 == NULL) {
4602 		err = got_error_from_errno("got_opentemp");
4603 		goto done;
4604 	}
4605 
4606 	s->f2 = got_opentemp();
4607 	if (s->f2 == NULL) {
4608 		err = got_error_from_errno("got_opentemp");
4609 		goto done;
4610 	}
4611 
4612 	s->fd1 = got_opentempfd();
4613 	if (s->fd1 == -1) {
4614 		err = got_error_from_errno("got_opentempfd");
4615 		goto done;
4616 	}
4617 
4618 	s->fd2 = got_opentempfd();
4619 	if (s->fd2 == -1) {
4620 		err = got_error_from_errno("got_opentempfd");
4621 		goto done;
4622 	}
4623 
4624 	s->first_displayed_line = 1;
4625 	s->last_displayed_line = view->nlines;
4626 	s->diff_context = diff_context;
4627 	s->ignore_whitespace = ignore_whitespace;
4628 	s->force_text_diff = force_text_diff;
4629 	s->parent_view = parent_view;
4630 	s->repo = repo;
4631 
4632 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4633 		int rc;
4634 
4635 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4636 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4637 		if (rc != ERR)
4638 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4639 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4640 		if (rc != ERR)
4641 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4642 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4643 		if (rc != ERR)
4644 			rc = init_pair(GOT_DIFF_LINE_META,
4645 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4646 		if (rc != ERR)
4647 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4648 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4649 		if (rc != ERR)
4650 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4651 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4652 		if (rc != ERR)
4653 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4654 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4655 		if (rc != ERR)
4656 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4657 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4658 		if (rc != ERR)
4659 			rc = init_pair(GOT_DIFF_LINE_DATE,
4660 			    get_color_value("TOG_COLOR_DATE"), -1);
4661 		if (rc == ERR) {
4662 			err = got_error(GOT_ERR_RANGE);
4663 			goto done;
4664 		}
4665 	}
4666 
4667 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4668 	    view_is_splitscreen(view))
4669 		show_log_view(parent_view); /* draw border */
4670 	diff_view_indicate_progress(view);
4671 
4672 	err = create_diff(s);
4673 
4674 	view->show = show_diff_view;
4675 	view->input = input_diff_view;
4676 	view->reset = reset_diff_view;
4677 	view->close = close_diff_view;
4678 	view->search_start = search_start_diff_view;
4679 	view->search_next = search_next_diff_view;
4680 done:
4681 	if (err)
4682 		close_diff_view(view);
4683 	return err;
4684 }
4685 
4686 static const struct got_error *
4687 show_diff_view(struct tog_view *view)
4688 {
4689 	const struct got_error *err;
4690 	struct tog_diff_view_state *s = &view->state.diff;
4691 	char *id_str1 = NULL, *id_str2, *header;
4692 	const char *label1, *label2;
4693 
4694 	if (s->id1) {
4695 		err = got_object_id_str(&id_str1, s->id1);
4696 		if (err)
4697 			return err;
4698 		label1 = s->label1 ? : id_str1;
4699 	} else
4700 		label1 = "/dev/null";
4701 
4702 	err = got_object_id_str(&id_str2, s->id2);
4703 	if (err)
4704 		return err;
4705 	label2 = s->label2 ? : id_str2;
4706 
4707 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4708 		err = got_error_from_errno("asprintf");
4709 		free(id_str1);
4710 		free(id_str2);
4711 		return err;
4712 	}
4713 	free(id_str1);
4714 	free(id_str2);
4715 
4716 	err = draw_file(view, header);
4717 	free(header);
4718 	return err;
4719 }
4720 
4721 static const struct got_error *
4722 set_selected_commit(struct tog_diff_view_state *s,
4723     struct commit_queue_entry *entry)
4724 {
4725 	const struct got_error *err;
4726 	const struct got_object_id_queue *parent_ids;
4727 	struct got_commit_object *selected_commit;
4728 	struct got_object_qid *pid;
4729 
4730 	free(s->id2);
4731 	s->id2 = got_object_id_dup(entry->id);
4732 	if (s->id2 == NULL)
4733 		return got_error_from_errno("got_object_id_dup");
4734 
4735 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4736 	if (err)
4737 		return err;
4738 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4739 	free(s->id1);
4740 	pid = STAILQ_FIRST(parent_ids);
4741 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4742 	got_object_commit_close(selected_commit);
4743 	return NULL;
4744 }
4745 
4746 static const struct got_error *
4747 reset_diff_view(struct tog_view *view)
4748 {
4749 	struct tog_diff_view_state *s = &view->state.diff;
4750 
4751 	view->count = 0;
4752 	wclear(view->window);
4753 	s->first_displayed_line = 1;
4754 	s->last_displayed_line = view->nlines;
4755 	s->matched_line = 0;
4756 	diff_view_indicate_progress(view);
4757 	return create_diff(s);
4758 }
4759 
4760 static void
4761 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4762 {
4763 	int start, i;
4764 
4765 	i = start = s->first_displayed_line - 1;
4766 
4767 	while (s->lines[i].type != type) {
4768 		if (i == 0)
4769 			i = s->nlines - 1;
4770 		if (--i == start)
4771 			return; /* do nothing, requested type not in file */
4772 	}
4773 
4774 	s->selected_line = 1;
4775 	s->first_displayed_line = i;
4776 }
4777 
4778 static void
4779 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4780 {
4781 	int start, i;
4782 
4783 	i = start = s->first_displayed_line + 1;
4784 
4785 	while (s->lines[i].type != type) {
4786 		if (i == s->nlines - 1)
4787 			i = 0;
4788 		if (++i == start)
4789 			return; /* do nothing, requested type not in file */
4790 	}
4791 
4792 	s->selected_line = 1;
4793 	s->first_displayed_line = i;
4794 }
4795 
4796 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4797     int, int, int);
4798 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4799     int, int);
4800 
4801 static const struct got_error *
4802 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4803 {
4804 	const struct got_error *err = NULL;
4805 	struct tog_diff_view_state *s = &view->state.diff;
4806 	struct tog_log_view_state *ls;
4807 	struct commit_queue_entry *old_selected_entry;
4808 	char *line = NULL;
4809 	size_t linesize = 0;
4810 	ssize_t linelen;
4811 	int i, nscroll = view->nlines - 1, up = 0;
4812 
4813 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
4814 
4815 	switch (ch) {
4816 	case '0':
4817 		view->x = 0;
4818 		break;
4819 	case '$':
4820 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4821 		view->count = 0;
4822 		break;
4823 	case KEY_RIGHT:
4824 	case 'l':
4825 		if (view->x + view->ncols / 3 < view->maxx)
4826 			view->x += 2;  /* move two columns right */
4827 		else
4828 			view->count = 0;
4829 		break;
4830 	case KEY_LEFT:
4831 	case 'h':
4832 		view->x -= MIN(view->x, 2);  /* move two columns back */
4833 		if (view->x <= 0)
4834 			view->count = 0;
4835 		break;
4836 	case 'a':
4837 	case 'w':
4838 		if (ch == 'a')
4839 			s->force_text_diff = !s->force_text_diff;
4840 		if (ch == 'w')
4841 			s->ignore_whitespace = !s->ignore_whitespace;
4842 		err = reset_diff_view(view);
4843 		break;
4844 	case 'g':
4845 	case KEY_HOME:
4846 		s->first_displayed_line = 1;
4847 		view->count = 0;
4848 		break;
4849 	case 'G':
4850 	case KEY_END:
4851 		view->count = 0;
4852 		if (s->eof)
4853 			break;
4854 
4855 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4856 		s->eof = 1;
4857 		break;
4858 	case 'k':
4859 	case KEY_UP:
4860 	case CTRL('p'):
4861 		if (s->first_displayed_line > 1)
4862 			s->first_displayed_line--;
4863 		else
4864 			view->count = 0;
4865 		break;
4866 	case CTRL('u'):
4867 	case 'u':
4868 		nscroll /= 2;
4869 		/* FALL THROUGH */
4870 	case KEY_PPAGE:
4871 	case CTRL('b'):
4872 	case 'b':
4873 		if (s->first_displayed_line == 1) {
4874 			view->count = 0;
4875 			break;
4876 		}
4877 		i = 0;
4878 		while (i++ < nscroll && s->first_displayed_line > 1)
4879 			s->first_displayed_line--;
4880 		break;
4881 	case 'j':
4882 	case KEY_DOWN:
4883 	case CTRL('n'):
4884 		if (!s->eof)
4885 			s->first_displayed_line++;
4886 		else
4887 			view->count = 0;
4888 		break;
4889 	case CTRL('d'):
4890 	case 'd':
4891 		nscroll /= 2;
4892 		/* FALL THROUGH */
4893 	case KEY_NPAGE:
4894 	case CTRL('f'):
4895 	case 'f':
4896 	case ' ':
4897 		if (s->eof) {
4898 			view->count = 0;
4899 			break;
4900 		}
4901 		i = 0;
4902 		while (!s->eof && i++ < nscroll) {
4903 			linelen = getline(&line, &linesize, s->f);
4904 			s->first_displayed_line++;
4905 			if (linelen == -1) {
4906 				if (feof(s->f)) {
4907 					s->eof = 1;
4908 				} else
4909 					err = got_ferror(s->f, GOT_ERR_IO);
4910 				break;
4911 			}
4912 		}
4913 		free(line);
4914 		break;
4915 	case '(':
4916 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
4917 		break;
4918 	case ')':
4919 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
4920 		break;
4921 	case '{':
4922 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
4923 		break;
4924 	case '}':
4925 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
4926 		break;
4927 	case '[':
4928 		if (s->diff_context > 0) {
4929 			s->diff_context--;
4930 			s->matched_line = 0;
4931 			diff_view_indicate_progress(view);
4932 			err = create_diff(s);
4933 			if (s->first_displayed_line + view->nlines - 1 >
4934 			    s->nlines) {
4935 				s->first_displayed_line = 1;
4936 				s->last_displayed_line = view->nlines;
4937 			}
4938 		} else
4939 			view->count = 0;
4940 		break;
4941 	case ']':
4942 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4943 			s->diff_context++;
4944 			s->matched_line = 0;
4945 			diff_view_indicate_progress(view);
4946 			err = create_diff(s);
4947 		} else
4948 			view->count = 0;
4949 		break;
4950 	case '<':
4951 	case ',':
4952 	case 'K':
4953 		up = 1;
4954 		/* FALL THROUGH */
4955 	case '>':
4956 	case '.':
4957 	case 'J':
4958 		if (s->parent_view == NULL) {
4959 			view->count = 0;
4960 			break;
4961 		}
4962 		s->parent_view->count = view->count;
4963 
4964 		if (s->parent_view->type == TOG_VIEW_LOG) {
4965 			ls = &s->parent_view->state.log;
4966 			old_selected_entry = ls->selected_entry;
4967 
4968 			err = input_log_view(NULL, s->parent_view,
4969 			    up ? KEY_UP : KEY_DOWN);
4970 			if (err)
4971 				break;
4972 			view->count = s->parent_view->count;
4973 
4974 			if (old_selected_entry == ls->selected_entry)
4975 				break;
4976 
4977 			err = set_selected_commit(s, ls->selected_entry);
4978 			if (err)
4979 				break;
4980 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4981 			struct tog_blame_view_state *bs;
4982 			struct got_object_id *id, *prev_id;
4983 
4984 			bs = &s->parent_view->state.blame;
4985 			prev_id = get_annotation_for_line(bs->blame.lines,
4986 			    bs->blame.nlines, bs->last_diffed_line);
4987 
4988 			err = input_blame_view(&view, s->parent_view,
4989 			    up ? KEY_UP : KEY_DOWN);
4990 			if (err)
4991 				break;
4992 			view->count = s->parent_view->count;
4993 
4994 			if (prev_id == NULL)
4995 				break;
4996 			id = get_selected_commit_id(bs->blame.lines,
4997 			    bs->blame.nlines, bs->first_displayed_line,
4998 			    bs->selected_line);
4999 			if (id == NULL)
5000 				break;
5001 
5002 			if (!got_object_id_cmp(prev_id, id))
5003 				break;
5004 
5005 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5006 			if (err)
5007 				break;
5008 		}
5009 		s->first_displayed_line = 1;
5010 		s->last_displayed_line = view->nlines;
5011 		s->matched_line = 0;
5012 		view->x = 0;
5013 
5014 		diff_view_indicate_progress(view);
5015 		err = create_diff(s);
5016 		break;
5017 	default:
5018 		view->count = 0;
5019 		break;
5020 	}
5021 
5022 	return err;
5023 }
5024 
5025 static const struct got_error *
5026 cmd_diff(int argc, char *argv[])
5027 {
5028 	const struct got_error *error = NULL;
5029 	struct got_repository *repo = NULL;
5030 	struct got_worktree *worktree = NULL;
5031 	struct got_object_id *id1 = NULL, *id2 = NULL;
5032 	char *repo_path = NULL, *cwd = NULL;
5033 	char *id_str1 = NULL, *id_str2 = NULL;
5034 	char *label1 = NULL, *label2 = NULL;
5035 	int diff_context = 3, ignore_whitespace = 0;
5036 	int ch, force_text_diff = 0;
5037 	const char *errstr;
5038 	struct tog_view *view;
5039 	int *pack_fds = NULL;
5040 
5041 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5042 		switch (ch) {
5043 		case 'a':
5044 			force_text_diff = 1;
5045 			break;
5046 		case 'C':
5047 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5048 			    &errstr);
5049 			if (errstr != NULL)
5050 				errx(1, "number of context lines is %s: %s",
5051 				    errstr, errstr);
5052 			break;
5053 		case 'r':
5054 			repo_path = realpath(optarg, NULL);
5055 			if (repo_path == NULL)
5056 				return got_error_from_errno2("realpath",
5057 				    optarg);
5058 			got_path_strip_trailing_slashes(repo_path);
5059 			break;
5060 		case 'w':
5061 			ignore_whitespace = 1;
5062 			break;
5063 		default:
5064 			usage_diff();
5065 			/* NOTREACHED */
5066 		}
5067 	}
5068 
5069 	argc -= optind;
5070 	argv += optind;
5071 
5072 	if (argc == 0) {
5073 		usage_diff(); /* TODO show local worktree changes */
5074 	} else if (argc == 2) {
5075 		id_str1 = argv[0];
5076 		id_str2 = argv[1];
5077 	} else
5078 		usage_diff();
5079 
5080 	error = got_repo_pack_fds_open(&pack_fds);
5081 	if (error)
5082 		goto done;
5083 
5084 	if (repo_path == NULL) {
5085 		cwd = getcwd(NULL, 0);
5086 		if (cwd == NULL)
5087 			return got_error_from_errno("getcwd");
5088 		error = got_worktree_open(&worktree, cwd);
5089 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5090 			goto done;
5091 		if (worktree)
5092 			repo_path =
5093 			    strdup(got_worktree_get_repo_path(worktree));
5094 		else
5095 			repo_path = strdup(cwd);
5096 		if (repo_path == NULL) {
5097 			error = got_error_from_errno("strdup");
5098 			goto done;
5099 		}
5100 	}
5101 
5102 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5103 	if (error)
5104 		goto done;
5105 
5106 	init_curses();
5107 
5108 	error = apply_unveil(got_repo_get_path(repo), NULL);
5109 	if (error)
5110 		goto done;
5111 
5112 	error = tog_load_refs(repo, 0);
5113 	if (error)
5114 		goto done;
5115 
5116 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5117 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5118 	if (error)
5119 		goto done;
5120 
5121 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5122 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5123 	if (error)
5124 		goto done;
5125 
5126 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5127 	if (view == NULL) {
5128 		error = got_error_from_errno("view_open");
5129 		goto done;
5130 	}
5131 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5132 	    ignore_whitespace, force_text_diff, NULL,  repo);
5133 	if (error)
5134 		goto done;
5135 	error = view_loop(view);
5136 done:
5137 	free(label1);
5138 	free(label2);
5139 	free(repo_path);
5140 	free(cwd);
5141 	if (repo) {
5142 		const struct got_error *close_err = got_repo_close(repo);
5143 		if (error == NULL)
5144 			error = close_err;
5145 	}
5146 	if (worktree)
5147 		got_worktree_close(worktree);
5148 	if (pack_fds) {
5149 		const struct got_error *pack_err =
5150 		    got_repo_pack_fds_close(pack_fds);
5151 		if (error == NULL)
5152 			error = pack_err;
5153 	}
5154 	tog_free_refs();
5155 	return error;
5156 }
5157 
5158 __dead static void
5159 usage_blame(void)
5160 {
5161 	endwin();
5162 	fprintf(stderr,
5163 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5164 	    getprogname());
5165 	exit(1);
5166 }
5167 
5168 struct tog_blame_line {
5169 	int annotated;
5170 	struct got_object_id *id;
5171 };
5172 
5173 static const struct got_error *
5174 draw_blame(struct tog_view *view)
5175 {
5176 	struct tog_blame_view_state *s = &view->state.blame;
5177 	struct tog_blame *blame = &s->blame;
5178 	regmatch_t *regmatch = &view->regmatch;
5179 	const struct got_error *err;
5180 	int lineno = 0, nprinted = 0;
5181 	char *line = NULL;
5182 	size_t linesize = 0;
5183 	ssize_t linelen;
5184 	wchar_t *wline;
5185 	int width;
5186 	struct tog_blame_line *blame_line;
5187 	struct got_object_id *prev_id = NULL;
5188 	char *id_str;
5189 	struct tog_color *tc;
5190 
5191 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5192 	if (err)
5193 		return err;
5194 
5195 	rewind(blame->f);
5196 	werase(view->window);
5197 
5198 	if (asprintf(&line, "commit %s", id_str) == -1) {
5199 		err = got_error_from_errno("asprintf");
5200 		free(id_str);
5201 		return err;
5202 	}
5203 
5204 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5205 	free(line);
5206 	line = NULL;
5207 	if (err)
5208 		return err;
5209 	if (view_needs_focus_indication(view))
5210 		wstandout(view->window);
5211 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5212 	if (tc)
5213 		wattr_on(view->window,
5214 		    COLOR_PAIR(tc->colorpair), NULL);
5215 	waddwstr(view->window, wline);
5216 	if (tc)
5217 		wattr_off(view->window,
5218 		    COLOR_PAIR(tc->colorpair), NULL);
5219 	if (view_needs_focus_indication(view))
5220 		wstandend(view->window);
5221 	free(wline);
5222 	wline = NULL;
5223 	if (width < view->ncols - 1)
5224 		waddch(view->window, '\n');
5225 
5226 	if (view->gline > blame->nlines)
5227 		view->gline = blame->nlines;
5228 
5229 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5230 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5231 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5232 		free(id_str);
5233 		return got_error_from_errno("asprintf");
5234 	}
5235 	free(id_str);
5236 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5237 	free(line);
5238 	line = NULL;
5239 	if (err)
5240 		return err;
5241 	waddwstr(view->window, wline);
5242 	free(wline);
5243 	wline = NULL;
5244 	if (width < view->ncols - 1)
5245 		waddch(view->window, '\n');
5246 
5247 	s->eof = 0;
5248 	view->maxx = 0;
5249 	while (nprinted < view->nlines - 2) {
5250 		linelen = getline(&line, &linesize, blame->f);
5251 		if (linelen == -1) {
5252 			if (feof(blame->f)) {
5253 				s->eof = 1;
5254 				break;
5255 			}
5256 			free(line);
5257 			return got_ferror(blame->f, GOT_ERR_IO);
5258 		}
5259 		if (++lineno < s->first_displayed_line)
5260 			continue;
5261 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5262 			continue;
5263 
5264 		/* Set view->maxx based on full line length. */
5265 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5266 		if (err) {
5267 			free(line);
5268 			return err;
5269 		}
5270 		free(wline);
5271 		wline = NULL;
5272 		view->maxx = MAX(view->maxx, width);
5273 
5274 		if (nprinted == s->selected_line - 1)
5275 			wstandout(view->window);
5276 
5277 		if (blame->nlines > 0) {
5278 			blame_line = &blame->lines[lineno - 1];
5279 			if (blame_line->annotated && prev_id &&
5280 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5281 			    !(nprinted == s->selected_line - 1)) {
5282 				waddstr(view->window, "        ");
5283 			} else if (blame_line->annotated) {
5284 				char *id_str;
5285 				err = got_object_id_str(&id_str,
5286 				    blame_line->id);
5287 				if (err) {
5288 					free(line);
5289 					return err;
5290 				}
5291 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5292 				if (tc)
5293 					wattr_on(view->window,
5294 					    COLOR_PAIR(tc->colorpair), NULL);
5295 				wprintw(view->window, "%.8s", id_str);
5296 				if (tc)
5297 					wattr_off(view->window,
5298 					    COLOR_PAIR(tc->colorpair), NULL);
5299 				free(id_str);
5300 				prev_id = blame_line->id;
5301 			} else {
5302 				waddstr(view->window, "........");
5303 				prev_id = NULL;
5304 			}
5305 		} else {
5306 			waddstr(view->window, "........");
5307 			prev_id = NULL;
5308 		}
5309 
5310 		if (nprinted == s->selected_line - 1)
5311 			wstandend(view->window);
5312 		waddstr(view->window, " ");
5313 
5314 		if (view->ncols <= 9) {
5315 			width = 9;
5316 		} else if (s->first_displayed_line + nprinted ==
5317 		    s->matched_line &&
5318 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5319 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5320 			    view->window, view->x, regmatch);
5321 			if (err) {
5322 				free(line);
5323 				return err;
5324 			}
5325 			width += 9;
5326 		} else {
5327 			int skip;
5328 			err = format_line(&wline, &width, &skip, line,
5329 			    view->x, view->ncols - 9, 9, 1);
5330 			if (err) {
5331 				free(line);
5332 				return err;
5333 			}
5334 			waddwstr(view->window, &wline[skip]);
5335 			width += 9;
5336 			free(wline);
5337 			wline = NULL;
5338 		}
5339 
5340 		if (width <= view->ncols - 1)
5341 			waddch(view->window, '\n');
5342 		if (++nprinted == 1)
5343 			s->first_displayed_line = lineno;
5344 	}
5345 	free(line);
5346 	s->last_displayed_line = lineno;
5347 
5348 	view_border(view);
5349 
5350 	return NULL;
5351 }
5352 
5353 static const struct got_error *
5354 blame_cb(void *arg, int nlines, int lineno,
5355     struct got_commit_object *commit, struct got_object_id *id)
5356 {
5357 	const struct got_error *err = NULL;
5358 	struct tog_blame_cb_args *a = arg;
5359 	struct tog_blame_line *line;
5360 	int errcode;
5361 
5362 	if (nlines != a->nlines ||
5363 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5364 		return got_error(GOT_ERR_RANGE);
5365 
5366 	errcode = pthread_mutex_lock(&tog_mutex);
5367 	if (errcode)
5368 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5369 
5370 	if (*a->quit) {	/* user has quit the blame view */
5371 		err = got_error(GOT_ERR_ITER_COMPLETED);
5372 		goto done;
5373 	}
5374 
5375 	if (lineno == -1)
5376 		goto done; /* no change in this commit */
5377 
5378 	line = &a->lines[lineno - 1];
5379 	if (line->annotated)
5380 		goto done;
5381 
5382 	line->id = got_object_id_dup(id);
5383 	if (line->id == NULL) {
5384 		err = got_error_from_errno("got_object_id_dup");
5385 		goto done;
5386 	}
5387 	line->annotated = 1;
5388 done:
5389 	errcode = pthread_mutex_unlock(&tog_mutex);
5390 	if (errcode)
5391 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5392 	return err;
5393 }
5394 
5395 static void *
5396 blame_thread(void *arg)
5397 {
5398 	const struct got_error *err, *close_err;
5399 	struct tog_blame_thread_args *ta = arg;
5400 	struct tog_blame_cb_args *a = ta->cb_args;
5401 	int errcode, fd1 = -1, fd2 = -1;
5402 	FILE *f1 = NULL, *f2 = NULL;
5403 
5404 	fd1 = got_opentempfd();
5405 	if (fd1 == -1)
5406 		return (void *)got_error_from_errno("got_opentempfd");
5407 
5408 	fd2 = got_opentempfd();
5409 	if (fd2 == -1) {
5410 		err = got_error_from_errno("got_opentempfd");
5411 		goto done;
5412 	}
5413 
5414 	f1 = got_opentemp();
5415 	if (f1 == NULL) {
5416 		err = (void *)got_error_from_errno("got_opentemp");
5417 		goto done;
5418 	}
5419 	f2 = got_opentemp();
5420 	if (f2 == NULL) {
5421 		err = (void *)got_error_from_errno("got_opentemp");
5422 		goto done;
5423 	}
5424 
5425 	err = block_signals_used_by_main_thread();
5426 	if (err)
5427 		goto done;
5428 
5429 	err = got_blame(ta->path, a->commit_id, ta->repo,
5430 	    tog_diff_algo, blame_cb, ta->cb_args,
5431 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5432 	if (err && err->code == GOT_ERR_CANCELLED)
5433 		err = NULL;
5434 
5435 	errcode = pthread_mutex_lock(&tog_mutex);
5436 	if (errcode) {
5437 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5438 		goto done;
5439 	}
5440 
5441 	close_err = got_repo_close(ta->repo);
5442 	if (err == NULL)
5443 		err = close_err;
5444 	ta->repo = NULL;
5445 	*ta->complete = 1;
5446 
5447 	errcode = pthread_mutex_unlock(&tog_mutex);
5448 	if (errcode && err == NULL)
5449 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5450 
5451 done:
5452 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5453 		err = got_error_from_errno("close");
5454 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5455 		err = got_error_from_errno("close");
5456 	if (f1 && fclose(f1) == EOF && err == NULL)
5457 		err = got_error_from_errno("fclose");
5458 	if (f2 && fclose(f2) == EOF && err == NULL)
5459 		err = got_error_from_errno("fclose");
5460 
5461 	return (void *)err;
5462 }
5463 
5464 static struct got_object_id *
5465 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5466     int first_displayed_line, int selected_line)
5467 {
5468 	struct tog_blame_line *line;
5469 
5470 	if (nlines <= 0)
5471 		return NULL;
5472 
5473 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5474 	if (!line->annotated)
5475 		return NULL;
5476 
5477 	return line->id;
5478 }
5479 
5480 static struct got_object_id *
5481 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5482     int lineno)
5483 {
5484 	struct tog_blame_line *line;
5485 
5486 	if (nlines <= 0 || lineno >= nlines)
5487 		return NULL;
5488 
5489 	line = &lines[lineno - 1];
5490 	if (!line->annotated)
5491 		return NULL;
5492 
5493 	return line->id;
5494 }
5495 
5496 static const struct got_error *
5497 stop_blame(struct tog_blame *blame)
5498 {
5499 	const struct got_error *err = NULL;
5500 	int i;
5501 
5502 	if (blame->thread) {
5503 		int errcode;
5504 		errcode = pthread_mutex_unlock(&tog_mutex);
5505 		if (errcode)
5506 			return got_error_set_errno(errcode,
5507 			    "pthread_mutex_unlock");
5508 		errcode = pthread_join(blame->thread, (void **)&err);
5509 		if (errcode)
5510 			return got_error_set_errno(errcode, "pthread_join");
5511 		errcode = pthread_mutex_lock(&tog_mutex);
5512 		if (errcode)
5513 			return got_error_set_errno(errcode,
5514 			    "pthread_mutex_lock");
5515 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5516 			err = NULL;
5517 		blame->thread = 0; //NULL;
5518 	}
5519 	if (blame->thread_args.repo) {
5520 		const struct got_error *close_err;
5521 		close_err = got_repo_close(blame->thread_args.repo);
5522 		if (err == NULL)
5523 			err = close_err;
5524 		blame->thread_args.repo = NULL;
5525 	}
5526 	if (blame->f) {
5527 		if (fclose(blame->f) == EOF && err == NULL)
5528 			err = got_error_from_errno("fclose");
5529 		blame->f = NULL;
5530 	}
5531 	if (blame->lines) {
5532 		for (i = 0; i < blame->nlines; i++)
5533 			free(blame->lines[i].id);
5534 		free(blame->lines);
5535 		blame->lines = NULL;
5536 	}
5537 	free(blame->cb_args.commit_id);
5538 	blame->cb_args.commit_id = NULL;
5539 	if (blame->pack_fds) {
5540 		const struct got_error *pack_err =
5541 		    got_repo_pack_fds_close(blame->pack_fds);
5542 		if (err == NULL)
5543 			err = pack_err;
5544 		blame->pack_fds = NULL;
5545 	}
5546 	return err;
5547 }
5548 
5549 static const struct got_error *
5550 cancel_blame_view(void *arg)
5551 {
5552 	const struct got_error *err = NULL;
5553 	int *done = arg;
5554 	int errcode;
5555 
5556 	errcode = pthread_mutex_lock(&tog_mutex);
5557 	if (errcode)
5558 		return got_error_set_errno(errcode,
5559 		    "pthread_mutex_unlock");
5560 
5561 	if (*done)
5562 		err = got_error(GOT_ERR_CANCELLED);
5563 
5564 	errcode = pthread_mutex_unlock(&tog_mutex);
5565 	if (errcode)
5566 		return got_error_set_errno(errcode,
5567 		    "pthread_mutex_lock");
5568 
5569 	return err;
5570 }
5571 
5572 static const struct got_error *
5573 run_blame(struct tog_view *view)
5574 {
5575 	struct tog_blame_view_state *s = &view->state.blame;
5576 	struct tog_blame *blame = &s->blame;
5577 	const struct got_error *err = NULL;
5578 	struct got_commit_object *commit = NULL;
5579 	struct got_blob_object *blob = NULL;
5580 	struct got_repository *thread_repo = NULL;
5581 	struct got_object_id *obj_id = NULL;
5582 	int obj_type, fd = -1;
5583 	int *pack_fds = NULL;
5584 
5585 	err = got_object_open_as_commit(&commit, s->repo,
5586 	    &s->blamed_commit->id);
5587 	if (err)
5588 		return err;
5589 
5590 	fd = got_opentempfd();
5591 	if (fd == -1) {
5592 		err = got_error_from_errno("got_opentempfd");
5593 		goto done;
5594 	}
5595 
5596 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5597 	if (err)
5598 		goto done;
5599 
5600 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5601 	if (err)
5602 		goto done;
5603 
5604 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5605 		err = got_error(GOT_ERR_OBJ_TYPE);
5606 		goto done;
5607 	}
5608 
5609 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5610 	if (err)
5611 		goto done;
5612 	blame->f = got_opentemp();
5613 	if (blame->f == NULL) {
5614 		err = got_error_from_errno("got_opentemp");
5615 		goto done;
5616 	}
5617 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5618 	    &blame->line_offsets, blame->f, blob);
5619 	if (err)
5620 		goto done;
5621 	if (blame->nlines == 0) {
5622 		s->blame_complete = 1;
5623 		goto done;
5624 	}
5625 
5626 	/* Don't include \n at EOF in the blame line count. */
5627 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5628 		blame->nlines--;
5629 
5630 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5631 	if (blame->lines == NULL) {
5632 		err = got_error_from_errno("calloc");
5633 		goto done;
5634 	}
5635 
5636 	err = got_repo_pack_fds_open(&pack_fds);
5637 	if (err)
5638 		goto done;
5639 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5640 	    pack_fds);
5641 	if (err)
5642 		goto done;
5643 
5644 	blame->pack_fds = pack_fds;
5645 	blame->cb_args.view = view;
5646 	blame->cb_args.lines = blame->lines;
5647 	blame->cb_args.nlines = blame->nlines;
5648 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5649 	if (blame->cb_args.commit_id == NULL) {
5650 		err = got_error_from_errno("got_object_id_dup");
5651 		goto done;
5652 	}
5653 	blame->cb_args.quit = &s->done;
5654 
5655 	blame->thread_args.path = s->path;
5656 	blame->thread_args.repo = thread_repo;
5657 	blame->thread_args.cb_args = &blame->cb_args;
5658 	blame->thread_args.complete = &s->blame_complete;
5659 	blame->thread_args.cancel_cb = cancel_blame_view;
5660 	blame->thread_args.cancel_arg = &s->done;
5661 	s->blame_complete = 0;
5662 
5663 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5664 		s->first_displayed_line = 1;
5665 		s->last_displayed_line = view->nlines;
5666 		s->selected_line = 1;
5667 	}
5668 	s->matched_line = 0;
5669 
5670 done:
5671 	if (commit)
5672 		got_object_commit_close(commit);
5673 	if (fd != -1 && close(fd) == -1 && err == NULL)
5674 		err = got_error_from_errno("close");
5675 	if (blob)
5676 		got_object_blob_close(blob);
5677 	free(obj_id);
5678 	if (err)
5679 		stop_blame(blame);
5680 	return err;
5681 }
5682 
5683 static const struct got_error *
5684 open_blame_view(struct tog_view *view, char *path,
5685     struct got_object_id *commit_id, struct got_repository *repo)
5686 {
5687 	const struct got_error *err = NULL;
5688 	struct tog_blame_view_state *s = &view->state.blame;
5689 
5690 	STAILQ_INIT(&s->blamed_commits);
5691 
5692 	s->path = strdup(path);
5693 	if (s->path == NULL)
5694 		return got_error_from_errno("strdup");
5695 
5696 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5697 	if (err) {
5698 		free(s->path);
5699 		return err;
5700 	}
5701 
5702 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5703 	s->first_displayed_line = 1;
5704 	s->last_displayed_line = view->nlines;
5705 	s->selected_line = 1;
5706 	s->blame_complete = 0;
5707 	s->repo = repo;
5708 	s->commit_id = commit_id;
5709 	memset(&s->blame, 0, sizeof(s->blame));
5710 
5711 	STAILQ_INIT(&s->colors);
5712 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5713 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5714 		    get_color_value("TOG_COLOR_COMMIT"));
5715 		if (err)
5716 			return err;
5717 	}
5718 
5719 	view->show = show_blame_view;
5720 	view->input = input_blame_view;
5721 	view->reset = reset_blame_view;
5722 	view->close = close_blame_view;
5723 	view->search_start = search_start_blame_view;
5724 	view->search_next = search_next_blame_view;
5725 
5726 	return run_blame(view);
5727 }
5728 
5729 static const struct got_error *
5730 close_blame_view(struct tog_view *view)
5731 {
5732 	const struct got_error *err = NULL;
5733 	struct tog_blame_view_state *s = &view->state.blame;
5734 
5735 	if (s->blame.thread)
5736 		err = stop_blame(&s->blame);
5737 
5738 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5739 		struct got_object_qid *blamed_commit;
5740 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5741 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5742 		got_object_qid_free(blamed_commit);
5743 	}
5744 
5745 	free(s->path);
5746 	free_colors(&s->colors);
5747 	return err;
5748 }
5749 
5750 static const struct got_error *
5751 search_start_blame_view(struct tog_view *view)
5752 {
5753 	struct tog_blame_view_state *s = &view->state.blame;
5754 
5755 	s->matched_line = 0;
5756 	return NULL;
5757 }
5758 
5759 static const struct got_error *
5760 search_next_blame_view(struct tog_view *view)
5761 {
5762 	struct tog_blame_view_state *s = &view->state.blame;
5763 	const struct got_error *err = NULL;
5764 	int lineno;
5765 	char *line = NULL;
5766 	size_t linesize = 0;
5767 	ssize_t linelen;
5768 
5769 	if (!view->searching) {
5770 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5771 		return NULL;
5772 	}
5773 
5774 	if (s->matched_line) {
5775 		if (view->searching == TOG_SEARCH_FORWARD)
5776 			lineno = s->matched_line + 1;
5777 		else
5778 			lineno = s->matched_line - 1;
5779 	} else
5780 		lineno = s->first_displayed_line - 1 + s->selected_line;
5781 
5782 	while (1) {
5783 		off_t offset;
5784 
5785 		if (lineno <= 0 || lineno > s->blame.nlines) {
5786 			if (s->matched_line == 0) {
5787 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5788 				break;
5789 			}
5790 
5791 			if (view->searching == TOG_SEARCH_FORWARD)
5792 				lineno = 1;
5793 			else
5794 				lineno = s->blame.nlines;
5795 		}
5796 
5797 		offset = s->blame.line_offsets[lineno - 1];
5798 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5799 			free(line);
5800 			return got_error_from_errno("fseeko");
5801 		}
5802 		linelen = getline(&line, &linesize, s->blame.f);
5803 		if (linelen != -1) {
5804 			char *exstr;
5805 			err = expand_tab(&exstr, line);
5806 			if (err)
5807 				break;
5808 			if (match_line(exstr, &view->regex, 1,
5809 			    &view->regmatch)) {
5810 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5811 				s->matched_line = lineno;
5812 				free(exstr);
5813 				break;
5814 			}
5815 			free(exstr);
5816 		}
5817 		if (view->searching == TOG_SEARCH_FORWARD)
5818 			lineno++;
5819 		else
5820 			lineno--;
5821 	}
5822 	free(line);
5823 
5824 	if (s->matched_line) {
5825 		s->first_displayed_line = s->matched_line;
5826 		s->selected_line = 1;
5827 	}
5828 
5829 	return err;
5830 }
5831 
5832 static const struct got_error *
5833 show_blame_view(struct tog_view *view)
5834 {
5835 	const struct got_error *err = NULL;
5836 	struct tog_blame_view_state *s = &view->state.blame;
5837 	int errcode;
5838 
5839 	if (s->blame.thread == 0 && !s->blame_complete) {
5840 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5841 		    &s->blame.thread_args);
5842 		if (errcode)
5843 			return got_error_set_errno(errcode, "pthread_create");
5844 
5845 		halfdelay(1); /* fast refresh while annotating  */
5846 	}
5847 
5848 	if (s->blame_complete)
5849 		halfdelay(10); /* disable fast refresh */
5850 
5851 	err = draw_blame(view);
5852 
5853 	view_border(view);
5854 	return err;
5855 }
5856 
5857 static const struct got_error *
5858 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5859     struct got_repository *repo, struct got_object_id *id)
5860 {
5861 	struct tog_view		*log_view;
5862 	const struct got_error	*err = NULL;
5863 
5864 	*new_view = NULL;
5865 
5866 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5867 	if (log_view == NULL)
5868 		return got_error_from_errno("view_open");
5869 
5870 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5871 	if (err)
5872 		view_close(log_view);
5873 	else
5874 		*new_view = log_view;
5875 
5876 	return err;
5877 }
5878 
5879 static const struct got_error *
5880 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5881 {
5882 	const struct got_error *err = NULL, *thread_err = NULL;
5883 	struct tog_view *diff_view;
5884 	struct tog_blame_view_state *s = &view->state.blame;
5885 	int eos, nscroll, begin_y = 0, begin_x = 0;
5886 
5887 	eos = nscroll = view->nlines - 2;
5888 	if (view_is_hsplit_top(view))
5889 		--eos;  /* border */
5890 
5891 	switch (ch) {
5892 	case '0':
5893 		view->x = 0;
5894 		break;
5895 	case '$':
5896 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5897 		view->count = 0;
5898 		break;
5899 	case KEY_RIGHT:
5900 	case 'l':
5901 		if (view->x + view->ncols / 3 < view->maxx)
5902 			view->x += 2;  /* move two columns right */
5903 		else
5904 			view->count = 0;
5905 		break;
5906 	case KEY_LEFT:
5907 	case 'h':
5908 		view->x -= MIN(view->x, 2);  /* move two columns back */
5909 		if (view->x <= 0)
5910 			view->count = 0;
5911 		break;
5912 	case 'q':
5913 		s->done = 1;
5914 		break;
5915 	case 'g':
5916 	case KEY_HOME:
5917 		s->selected_line = 1;
5918 		s->first_displayed_line = 1;
5919 		view->count = 0;
5920 		break;
5921 	case 'G':
5922 	case KEY_END:
5923 		if (s->blame.nlines < eos) {
5924 			s->selected_line = s->blame.nlines;
5925 			s->first_displayed_line = 1;
5926 		} else {
5927 			s->selected_line = eos;
5928 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5929 		}
5930 		view->count = 0;
5931 		break;
5932 	case 'k':
5933 	case KEY_UP:
5934 	case CTRL('p'):
5935 		if (s->selected_line > 1)
5936 			s->selected_line--;
5937 		else if (s->selected_line == 1 &&
5938 		    s->first_displayed_line > 1)
5939 			s->first_displayed_line--;
5940 		else
5941 			view->count = 0;
5942 		break;
5943 	case CTRL('u'):
5944 	case 'u':
5945 		nscroll /= 2;
5946 		/* FALL THROUGH */
5947 	case KEY_PPAGE:
5948 	case CTRL('b'):
5949 	case 'b':
5950 		if (s->first_displayed_line == 1) {
5951 			if (view->count > 1)
5952 				nscroll += nscroll;
5953 			s->selected_line = MAX(1, s->selected_line - nscroll);
5954 			view->count = 0;
5955 			break;
5956 		}
5957 		if (s->first_displayed_line > nscroll)
5958 			s->first_displayed_line -= nscroll;
5959 		else
5960 			s->first_displayed_line = 1;
5961 		break;
5962 	case 'j':
5963 	case KEY_DOWN:
5964 	case CTRL('n'):
5965 		if (s->selected_line < eos && s->first_displayed_line +
5966 		    s->selected_line <= s->blame.nlines)
5967 			s->selected_line++;
5968 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5969 			s->first_displayed_line++;
5970 		else
5971 			view->count = 0;
5972 		break;
5973 	case 'c':
5974 	case 'p': {
5975 		struct got_object_id *id = NULL;
5976 
5977 		view->count = 0;
5978 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5979 		    s->first_displayed_line, s->selected_line);
5980 		if (id == NULL)
5981 			break;
5982 		if (ch == 'p') {
5983 			struct got_commit_object *commit, *pcommit;
5984 			struct got_object_qid *pid;
5985 			struct got_object_id *blob_id = NULL;
5986 			int obj_type;
5987 			err = got_object_open_as_commit(&commit,
5988 			    s->repo, id);
5989 			if (err)
5990 				break;
5991 			pid = STAILQ_FIRST(
5992 			    got_object_commit_get_parent_ids(commit));
5993 			if (pid == NULL) {
5994 				got_object_commit_close(commit);
5995 				break;
5996 			}
5997 			/* Check if path history ends here. */
5998 			err = got_object_open_as_commit(&pcommit,
5999 			    s->repo, &pid->id);
6000 			if (err)
6001 				break;
6002 			err = got_object_id_by_path(&blob_id, s->repo,
6003 			    pcommit, s->path);
6004 			got_object_commit_close(pcommit);
6005 			if (err) {
6006 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6007 					err = NULL;
6008 				got_object_commit_close(commit);
6009 				break;
6010 			}
6011 			err = got_object_get_type(&obj_type, s->repo,
6012 			    blob_id);
6013 			free(blob_id);
6014 			/* Can't blame non-blob type objects. */
6015 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6016 				got_object_commit_close(commit);
6017 				break;
6018 			}
6019 			err = got_object_qid_alloc(&s->blamed_commit,
6020 			    &pid->id);
6021 			got_object_commit_close(commit);
6022 		} else {
6023 			if (got_object_id_cmp(id,
6024 			    &s->blamed_commit->id) == 0)
6025 				break;
6026 			err = got_object_qid_alloc(&s->blamed_commit,
6027 			    id);
6028 		}
6029 		if (err)
6030 			break;
6031 		s->done = 1;
6032 		thread_err = stop_blame(&s->blame);
6033 		s->done = 0;
6034 		if (thread_err)
6035 			break;
6036 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6037 		    s->blamed_commit, entry);
6038 		err = run_blame(view);
6039 		if (err)
6040 			break;
6041 		break;
6042 	}
6043 	case 'C': {
6044 		struct got_object_qid *first;
6045 
6046 		view->count = 0;
6047 		first = STAILQ_FIRST(&s->blamed_commits);
6048 		if (!got_object_id_cmp(&first->id, s->commit_id))
6049 			break;
6050 		s->done = 1;
6051 		thread_err = stop_blame(&s->blame);
6052 		s->done = 0;
6053 		if (thread_err)
6054 			break;
6055 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6056 		got_object_qid_free(s->blamed_commit);
6057 		s->blamed_commit =
6058 		    STAILQ_FIRST(&s->blamed_commits);
6059 		err = run_blame(view);
6060 		if (err)
6061 			break;
6062 		break;
6063 	}
6064 	case 'L':
6065 		view->count = 0;
6066 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6067 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6068 		if (s->id_to_log)
6069 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6070 		break;
6071 	case KEY_ENTER:
6072 	case '\r': {
6073 		struct got_object_id *id = NULL;
6074 		struct got_object_qid *pid;
6075 		struct got_commit_object *commit = NULL;
6076 
6077 		view->count = 0;
6078 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6079 		    s->first_displayed_line, s->selected_line);
6080 		if (id == NULL)
6081 			break;
6082 		err = got_object_open_as_commit(&commit, s->repo, id);
6083 		if (err)
6084 			break;
6085 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6086 		if (*new_view) {
6087 			/* traversed from diff view, release diff resources  */
6088 			err = close_diff_view(*new_view);
6089 			if (err)
6090 				break;
6091 			diff_view = *new_view;
6092 		} else {
6093 			if (view_is_parent_view(view))
6094 				view_get_split(view, &begin_y, &begin_x);
6095 
6096 			diff_view = view_open(0, 0, begin_y, begin_x,
6097 			    TOG_VIEW_DIFF);
6098 			if (diff_view == NULL) {
6099 				got_object_commit_close(commit);
6100 				err = got_error_from_errno("view_open");
6101 				break;
6102 			}
6103 		}
6104 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6105 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6106 		got_object_commit_close(commit);
6107 		if (err) {
6108 			view_close(diff_view);
6109 			break;
6110 		}
6111 		s->last_diffed_line = s->first_displayed_line - 1 +
6112 		    s->selected_line;
6113 		if (*new_view)
6114 			break;	/* still open from active diff view */
6115 		if (view_is_parent_view(view) &&
6116 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6117 			err = view_init_hsplit(view, begin_y);
6118 			if (err)
6119 				break;
6120 		}
6121 
6122 		view->focussed = 0;
6123 		diff_view->focussed = 1;
6124 		diff_view->mode = view->mode;
6125 		diff_view->nlines = view->lines - begin_y;
6126 		if (view_is_parent_view(view)) {
6127 			view_transfer_size(diff_view, view);
6128 			err = view_close_child(view);
6129 			if (err)
6130 				break;
6131 			err = view_set_child(view, diff_view);
6132 			if (err)
6133 				break;
6134 			view->focus_child = 1;
6135 		} else
6136 			*new_view = diff_view;
6137 		if (err)
6138 			break;
6139 		break;
6140 	}
6141 	case CTRL('d'):
6142 	case 'd':
6143 		nscroll /= 2;
6144 		/* FALL THROUGH */
6145 	case KEY_NPAGE:
6146 	case CTRL('f'):
6147 	case 'f':
6148 	case ' ':
6149 		if (s->last_displayed_line >= s->blame.nlines &&
6150 		    s->selected_line >= MIN(s->blame.nlines,
6151 		    view->nlines - 2)) {
6152 			view->count = 0;
6153 			break;
6154 		}
6155 		if (s->last_displayed_line >= s->blame.nlines &&
6156 		    s->selected_line < view->nlines - 2) {
6157 			s->selected_line +=
6158 			    MIN(nscroll, s->last_displayed_line -
6159 			    s->first_displayed_line - s->selected_line + 1);
6160 		}
6161 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6162 			s->first_displayed_line += nscroll;
6163 		else
6164 			s->first_displayed_line =
6165 			    s->blame.nlines - (view->nlines - 3);
6166 		break;
6167 	case KEY_RESIZE:
6168 		if (s->selected_line > view->nlines - 2) {
6169 			s->selected_line = MIN(s->blame.nlines,
6170 			    view->nlines - 2);
6171 		}
6172 		break;
6173 	default:
6174 		view->count = 0;
6175 		break;
6176 	}
6177 	return thread_err ? thread_err : err;
6178 }
6179 
6180 static const struct got_error *
6181 reset_blame_view(struct tog_view *view)
6182 {
6183 	const struct got_error *err;
6184 	struct tog_blame_view_state *s = &view->state.blame;
6185 
6186 	view->count = 0;
6187 	s->done = 1;
6188 	err = stop_blame(&s->blame);
6189 	s->done = 0;
6190 	if (err)
6191 		return err;
6192 	return run_blame(view);
6193 }
6194 
6195 static const struct got_error *
6196 cmd_blame(int argc, char *argv[])
6197 {
6198 	const struct got_error *error;
6199 	struct got_repository *repo = NULL;
6200 	struct got_worktree *worktree = NULL;
6201 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6202 	char *link_target = NULL;
6203 	struct got_object_id *commit_id = NULL;
6204 	struct got_commit_object *commit = NULL;
6205 	char *commit_id_str = NULL;
6206 	int ch;
6207 	struct tog_view *view;
6208 	int *pack_fds = NULL;
6209 
6210 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6211 		switch (ch) {
6212 		case 'c':
6213 			commit_id_str = optarg;
6214 			break;
6215 		case 'r':
6216 			repo_path = realpath(optarg, NULL);
6217 			if (repo_path == NULL)
6218 				return got_error_from_errno2("realpath",
6219 				    optarg);
6220 			break;
6221 		default:
6222 			usage_blame();
6223 			/* NOTREACHED */
6224 		}
6225 	}
6226 
6227 	argc -= optind;
6228 	argv += optind;
6229 
6230 	if (argc != 1)
6231 		usage_blame();
6232 
6233 	error = got_repo_pack_fds_open(&pack_fds);
6234 	if (error != NULL)
6235 		goto done;
6236 
6237 	if (repo_path == NULL) {
6238 		cwd = getcwd(NULL, 0);
6239 		if (cwd == NULL)
6240 			return got_error_from_errno("getcwd");
6241 		error = got_worktree_open(&worktree, cwd);
6242 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6243 			goto done;
6244 		if (worktree)
6245 			repo_path =
6246 			    strdup(got_worktree_get_repo_path(worktree));
6247 		else
6248 			repo_path = strdup(cwd);
6249 		if (repo_path == NULL) {
6250 			error = got_error_from_errno("strdup");
6251 			goto done;
6252 		}
6253 	}
6254 
6255 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6256 	if (error != NULL)
6257 		goto done;
6258 
6259 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6260 	    worktree);
6261 	if (error)
6262 		goto done;
6263 
6264 	init_curses();
6265 
6266 	error = apply_unveil(got_repo_get_path(repo), NULL);
6267 	if (error)
6268 		goto done;
6269 
6270 	error = tog_load_refs(repo, 0);
6271 	if (error)
6272 		goto done;
6273 
6274 	if (commit_id_str == NULL) {
6275 		struct got_reference *head_ref;
6276 		error = got_ref_open(&head_ref, repo, worktree ?
6277 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6278 		if (error != NULL)
6279 			goto done;
6280 		error = got_ref_resolve(&commit_id, repo, head_ref);
6281 		got_ref_close(head_ref);
6282 	} else {
6283 		error = got_repo_match_object_id(&commit_id, NULL,
6284 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6285 	}
6286 	if (error != NULL)
6287 		goto done;
6288 
6289 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6290 	if (view == NULL) {
6291 		error = got_error_from_errno("view_open");
6292 		goto done;
6293 	}
6294 
6295 	error = got_object_open_as_commit(&commit, repo, commit_id);
6296 	if (error)
6297 		goto done;
6298 
6299 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6300 	    commit, repo);
6301 	if (error)
6302 		goto done;
6303 
6304 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6305 	    commit_id, repo);
6306 	if (error)
6307 		goto done;
6308 	if (worktree) {
6309 		/* Release work tree lock. */
6310 		got_worktree_close(worktree);
6311 		worktree = NULL;
6312 	}
6313 	error = view_loop(view);
6314 done:
6315 	free(repo_path);
6316 	free(in_repo_path);
6317 	free(link_target);
6318 	free(cwd);
6319 	free(commit_id);
6320 	if (commit)
6321 		got_object_commit_close(commit);
6322 	if (worktree)
6323 		got_worktree_close(worktree);
6324 	if (repo) {
6325 		const struct got_error *close_err = got_repo_close(repo);
6326 		if (error == NULL)
6327 			error = close_err;
6328 	}
6329 	if (pack_fds) {
6330 		const struct got_error *pack_err =
6331 		    got_repo_pack_fds_close(pack_fds);
6332 		if (error == NULL)
6333 			error = pack_err;
6334 	}
6335 	tog_free_refs();
6336 	return error;
6337 }
6338 
6339 static const struct got_error *
6340 draw_tree_entries(struct tog_view *view, const char *parent_path)
6341 {
6342 	struct tog_tree_view_state *s = &view->state.tree;
6343 	const struct got_error *err = NULL;
6344 	struct got_tree_entry *te;
6345 	wchar_t *wline;
6346 	struct tog_color *tc;
6347 	int width, n, nentries, i = 1;
6348 	int limit = view->nlines;
6349 
6350 	s->ndisplayed = 0;
6351 	if (view_is_hsplit_top(view))
6352 		--limit;  /* border */
6353 
6354 	werase(view->window);
6355 
6356 	if (limit == 0)
6357 		return NULL;
6358 
6359 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6360 	    0, 0);
6361 	if (err)
6362 		return err;
6363 	if (view_needs_focus_indication(view))
6364 		wstandout(view->window);
6365 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6366 	if (tc)
6367 		wattr_on(view->window,
6368 		    COLOR_PAIR(tc->colorpair), NULL);
6369 	waddwstr(view->window, wline);
6370 	if (tc)
6371 		wattr_off(view->window,
6372 		    COLOR_PAIR(tc->colorpair), NULL);
6373 	if (view_needs_focus_indication(view))
6374 		wstandend(view->window);
6375 	free(wline);
6376 	wline = NULL;
6377 
6378 	if (s->selected_entry) {
6379 		i = got_tree_entry_get_index(s->selected_entry);
6380 		i += s->tree == s->root ? 1 : 2;  /* account for ".." entry */
6381 	}
6382 	nentries = got_object_tree_get_nentries(s->tree);
6383 	wprintw(view->window, " [%d/%d]", i,
6384 	    nentries + (s->tree == s->root ? 0 : 1));  /* ".." in !root tree */
6385 
6386 	if (width < view->ncols - 1)
6387 		waddch(view->window, '\n');
6388 	if (--limit <= 0)
6389 		return NULL;
6390 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6391 	    0, 0);
6392 	if (err)
6393 		return err;
6394 	waddwstr(view->window, wline);
6395 	free(wline);
6396 	wline = NULL;
6397 	if (width < view->ncols - 1)
6398 		waddch(view->window, '\n');
6399 	if (--limit <= 0)
6400 		return NULL;
6401 	waddch(view->window, '\n');
6402 	if (--limit <= 0)
6403 		return NULL;
6404 
6405 	if (s->first_displayed_entry == NULL) {
6406 		te = got_object_tree_get_first_entry(s->tree);
6407 		if (s->selected == 0) {
6408 			if (view->focussed)
6409 				wstandout(view->window);
6410 			s->selected_entry = NULL;
6411 		}
6412 		waddstr(view->window, "  ..\n");	/* parent directory */
6413 		if (s->selected == 0 && view->focussed)
6414 			wstandend(view->window);
6415 		s->ndisplayed++;
6416 		if (--limit <= 0)
6417 			return NULL;
6418 		n = 1;
6419 	} else {
6420 		n = 0;
6421 		te = s->first_displayed_entry;
6422 	}
6423 
6424 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6425 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6426 		const char *modestr = "";
6427 		mode_t mode;
6428 
6429 		te = got_object_tree_get_entry(s->tree, i);
6430 		mode = got_tree_entry_get_mode(te);
6431 
6432 		if (s->show_ids) {
6433 			err = got_object_id_str(&id_str,
6434 			    got_tree_entry_get_id(te));
6435 			if (err)
6436 				return got_error_from_errno(
6437 				    "got_object_id_str");
6438 		}
6439 		if (got_object_tree_entry_is_submodule(te))
6440 			modestr = "$";
6441 		else if (S_ISLNK(mode)) {
6442 			int i;
6443 
6444 			err = got_tree_entry_get_symlink_target(&link_target,
6445 			    te, s->repo);
6446 			if (err) {
6447 				free(id_str);
6448 				return err;
6449 			}
6450 			for (i = 0; i < strlen(link_target); i++) {
6451 				if (!isprint((unsigned char)link_target[i]))
6452 					link_target[i] = '?';
6453 			}
6454 			modestr = "@";
6455 		}
6456 		else if (S_ISDIR(mode))
6457 			modestr = "/";
6458 		else if (mode & S_IXUSR)
6459 			modestr = "*";
6460 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6461 		    got_tree_entry_get_name(te), modestr,
6462 		    link_target ? " -> ": "",
6463 		    link_target ? link_target : "") == -1) {
6464 			free(id_str);
6465 			free(link_target);
6466 			return got_error_from_errno("asprintf");
6467 		}
6468 		free(id_str);
6469 		free(link_target);
6470 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6471 		    0, 0);
6472 		if (err) {
6473 			free(line);
6474 			break;
6475 		}
6476 		if (n == s->selected) {
6477 			if (view->focussed)
6478 				wstandout(view->window);
6479 			s->selected_entry = te;
6480 		}
6481 		tc = match_color(&s->colors, line);
6482 		if (tc)
6483 			wattr_on(view->window,
6484 			    COLOR_PAIR(tc->colorpair), NULL);
6485 		waddwstr(view->window, wline);
6486 		if (tc)
6487 			wattr_off(view->window,
6488 			    COLOR_PAIR(tc->colorpair), NULL);
6489 		if (width < view->ncols - 1)
6490 			waddch(view->window, '\n');
6491 		if (n == s->selected && view->focussed)
6492 			wstandend(view->window);
6493 		free(line);
6494 		free(wline);
6495 		wline = NULL;
6496 		n++;
6497 		s->ndisplayed++;
6498 		s->last_displayed_entry = te;
6499 		if (--limit <= 0)
6500 			break;
6501 	}
6502 
6503 	return err;
6504 }
6505 
6506 static void
6507 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6508 {
6509 	struct got_tree_entry *te;
6510 	int isroot = s->tree == s->root;
6511 	int i = 0;
6512 
6513 	if (s->first_displayed_entry == NULL)
6514 		return;
6515 
6516 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6517 	while (i++ < maxscroll) {
6518 		if (te == NULL) {
6519 			if (!isroot)
6520 				s->first_displayed_entry = NULL;
6521 			break;
6522 		}
6523 		s->first_displayed_entry = te;
6524 		te = got_tree_entry_get_prev(s->tree, te);
6525 	}
6526 }
6527 
6528 static const struct got_error *
6529 tree_scroll_down(struct tog_view *view, int maxscroll)
6530 {
6531 	struct tog_tree_view_state *s = &view->state.tree;
6532 	struct got_tree_entry *next, *last;
6533 	int n = 0;
6534 
6535 	if (s->first_displayed_entry)
6536 		next = got_tree_entry_get_next(s->tree,
6537 		    s->first_displayed_entry);
6538 	else
6539 		next = got_object_tree_get_first_entry(s->tree);
6540 
6541 	last = s->last_displayed_entry;
6542 	while (next && n++ < maxscroll) {
6543 		if (last) {
6544 			s->last_displayed_entry = last;
6545 			last = got_tree_entry_get_next(s->tree, last);
6546 		}
6547 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6548 			s->first_displayed_entry = next;
6549 			next = got_tree_entry_get_next(s->tree, next);
6550 		}
6551 	}
6552 
6553 	return NULL;
6554 }
6555 
6556 static const struct got_error *
6557 tree_entry_path(char **path, struct tog_parent_trees *parents,
6558     struct got_tree_entry *te)
6559 {
6560 	const struct got_error *err = NULL;
6561 	struct tog_parent_tree *pt;
6562 	size_t len = 2; /* for leading slash and NUL */
6563 
6564 	TAILQ_FOREACH(pt, parents, entry)
6565 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6566 		    + 1 /* slash */;
6567 	if (te)
6568 		len += strlen(got_tree_entry_get_name(te));
6569 
6570 	*path = calloc(1, len);
6571 	if (path == NULL)
6572 		return got_error_from_errno("calloc");
6573 
6574 	(*path)[0] = '/';
6575 	pt = TAILQ_LAST(parents, tog_parent_trees);
6576 	while (pt) {
6577 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6578 		if (strlcat(*path, name, len) >= len) {
6579 			err = got_error(GOT_ERR_NO_SPACE);
6580 			goto done;
6581 		}
6582 		if (strlcat(*path, "/", len) >= len) {
6583 			err = got_error(GOT_ERR_NO_SPACE);
6584 			goto done;
6585 		}
6586 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6587 	}
6588 	if (te) {
6589 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6590 			err = got_error(GOT_ERR_NO_SPACE);
6591 			goto done;
6592 		}
6593 	}
6594 done:
6595 	if (err) {
6596 		free(*path);
6597 		*path = NULL;
6598 	}
6599 	return err;
6600 }
6601 
6602 static const struct got_error *
6603 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6604     struct got_tree_entry *te, struct tog_parent_trees *parents,
6605     struct got_object_id *commit_id, struct got_repository *repo)
6606 {
6607 	const struct got_error *err = NULL;
6608 	char *path;
6609 	struct tog_view *blame_view;
6610 
6611 	*new_view = NULL;
6612 
6613 	err = tree_entry_path(&path, parents, te);
6614 	if (err)
6615 		return err;
6616 
6617 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6618 	if (blame_view == NULL) {
6619 		err = got_error_from_errno("view_open");
6620 		goto done;
6621 	}
6622 
6623 	err = open_blame_view(blame_view, path, commit_id, repo);
6624 	if (err) {
6625 		if (err->code == GOT_ERR_CANCELLED)
6626 			err = NULL;
6627 		view_close(blame_view);
6628 	} else
6629 		*new_view = blame_view;
6630 done:
6631 	free(path);
6632 	return err;
6633 }
6634 
6635 static const struct got_error *
6636 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6637     struct tog_tree_view_state *s)
6638 {
6639 	struct tog_view *log_view;
6640 	const struct got_error *err = NULL;
6641 	char *path;
6642 
6643 	*new_view = NULL;
6644 
6645 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6646 	if (log_view == NULL)
6647 		return got_error_from_errno("view_open");
6648 
6649 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6650 	if (err)
6651 		return err;
6652 
6653 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6654 	    path, 0);
6655 	if (err)
6656 		view_close(log_view);
6657 	else
6658 		*new_view = log_view;
6659 	free(path);
6660 	return err;
6661 }
6662 
6663 static const struct got_error *
6664 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6665     const char *head_ref_name, struct got_repository *repo)
6666 {
6667 	const struct got_error *err = NULL;
6668 	char *commit_id_str = NULL;
6669 	struct tog_tree_view_state *s = &view->state.tree;
6670 	struct got_commit_object *commit = NULL;
6671 
6672 	TAILQ_INIT(&s->parents);
6673 	STAILQ_INIT(&s->colors);
6674 
6675 	s->commit_id = got_object_id_dup(commit_id);
6676 	if (s->commit_id == NULL)
6677 		return got_error_from_errno("got_object_id_dup");
6678 
6679 	err = got_object_open_as_commit(&commit, repo, commit_id);
6680 	if (err)
6681 		goto done;
6682 
6683 	/*
6684 	 * The root is opened here and will be closed when the view is closed.
6685 	 * Any visited subtrees and their path-wise parents are opened and
6686 	 * closed on demand.
6687 	 */
6688 	err = got_object_open_as_tree(&s->root, repo,
6689 	    got_object_commit_get_tree_id(commit));
6690 	if (err)
6691 		goto done;
6692 	s->tree = s->root;
6693 
6694 	err = got_object_id_str(&commit_id_str, commit_id);
6695 	if (err != NULL)
6696 		goto done;
6697 
6698 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6699 		err = got_error_from_errno("asprintf");
6700 		goto done;
6701 	}
6702 
6703 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6704 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6705 	if (head_ref_name) {
6706 		s->head_ref_name = strdup(head_ref_name);
6707 		if (s->head_ref_name == NULL) {
6708 			err = got_error_from_errno("strdup");
6709 			goto done;
6710 		}
6711 	}
6712 	s->repo = repo;
6713 
6714 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6715 		err = add_color(&s->colors, "\\$$",
6716 		    TOG_COLOR_TREE_SUBMODULE,
6717 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6718 		if (err)
6719 			goto done;
6720 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6721 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6722 		if (err)
6723 			goto done;
6724 		err = add_color(&s->colors, "/$",
6725 		    TOG_COLOR_TREE_DIRECTORY,
6726 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6727 		if (err)
6728 			goto done;
6729 
6730 		err = add_color(&s->colors, "\\*$",
6731 		    TOG_COLOR_TREE_EXECUTABLE,
6732 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6733 		if (err)
6734 			goto done;
6735 
6736 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6737 		    get_color_value("TOG_COLOR_COMMIT"));
6738 		if (err)
6739 			goto done;
6740 	}
6741 
6742 	view->show = show_tree_view;
6743 	view->input = input_tree_view;
6744 	view->close = close_tree_view;
6745 	view->search_start = search_start_tree_view;
6746 	view->search_next = search_next_tree_view;
6747 done:
6748 	free(commit_id_str);
6749 	if (commit)
6750 		got_object_commit_close(commit);
6751 	if (err)
6752 		close_tree_view(view);
6753 	return err;
6754 }
6755 
6756 static const struct got_error *
6757 close_tree_view(struct tog_view *view)
6758 {
6759 	struct tog_tree_view_state *s = &view->state.tree;
6760 
6761 	free_colors(&s->colors);
6762 	free(s->tree_label);
6763 	s->tree_label = NULL;
6764 	free(s->commit_id);
6765 	s->commit_id = NULL;
6766 	free(s->head_ref_name);
6767 	s->head_ref_name = NULL;
6768 	while (!TAILQ_EMPTY(&s->parents)) {
6769 		struct tog_parent_tree *parent;
6770 		parent = TAILQ_FIRST(&s->parents);
6771 		TAILQ_REMOVE(&s->parents, parent, entry);
6772 		if (parent->tree != s->root)
6773 			got_object_tree_close(parent->tree);
6774 		free(parent);
6775 
6776 	}
6777 	if (s->tree != NULL && s->tree != s->root)
6778 		got_object_tree_close(s->tree);
6779 	if (s->root)
6780 		got_object_tree_close(s->root);
6781 	return NULL;
6782 }
6783 
6784 static const struct got_error *
6785 search_start_tree_view(struct tog_view *view)
6786 {
6787 	struct tog_tree_view_state *s = &view->state.tree;
6788 
6789 	s->matched_entry = NULL;
6790 	return NULL;
6791 }
6792 
6793 static int
6794 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6795 {
6796 	regmatch_t regmatch;
6797 
6798 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6799 	    0) == 0;
6800 }
6801 
6802 static const struct got_error *
6803 search_next_tree_view(struct tog_view *view)
6804 {
6805 	struct tog_tree_view_state *s = &view->state.tree;
6806 	struct got_tree_entry *te = NULL;
6807 
6808 	if (!view->searching) {
6809 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6810 		return NULL;
6811 	}
6812 
6813 	if (s->matched_entry) {
6814 		if (view->searching == TOG_SEARCH_FORWARD) {
6815 			if (s->selected_entry)
6816 				te = got_tree_entry_get_next(s->tree,
6817 				    s->selected_entry);
6818 			else
6819 				te = got_object_tree_get_first_entry(s->tree);
6820 		} else {
6821 			if (s->selected_entry == NULL)
6822 				te = got_object_tree_get_last_entry(s->tree);
6823 			else
6824 				te = got_tree_entry_get_prev(s->tree,
6825 				    s->selected_entry);
6826 		}
6827 	} else {
6828 		if (s->selected_entry)
6829 			te = s->selected_entry;
6830 		else if (view->searching == TOG_SEARCH_FORWARD)
6831 			te = got_object_tree_get_first_entry(s->tree);
6832 		else
6833 			te = got_object_tree_get_last_entry(s->tree);
6834 	}
6835 
6836 	while (1) {
6837 		if (te == NULL) {
6838 			if (s->matched_entry == NULL) {
6839 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6840 				return NULL;
6841 			}
6842 			if (view->searching == TOG_SEARCH_FORWARD)
6843 				te = got_object_tree_get_first_entry(s->tree);
6844 			else
6845 				te = got_object_tree_get_last_entry(s->tree);
6846 		}
6847 
6848 		if (match_tree_entry(te, &view->regex)) {
6849 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6850 			s->matched_entry = te;
6851 			break;
6852 		}
6853 
6854 		if (view->searching == TOG_SEARCH_FORWARD)
6855 			te = got_tree_entry_get_next(s->tree, te);
6856 		else
6857 			te = got_tree_entry_get_prev(s->tree, te);
6858 	}
6859 
6860 	if (s->matched_entry) {
6861 		s->first_displayed_entry = s->matched_entry;
6862 		s->selected = 0;
6863 	}
6864 
6865 	return NULL;
6866 }
6867 
6868 static const struct got_error *
6869 show_tree_view(struct tog_view *view)
6870 {
6871 	const struct got_error *err = NULL;
6872 	struct tog_tree_view_state *s = &view->state.tree;
6873 	char *parent_path;
6874 
6875 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6876 	if (err)
6877 		return err;
6878 
6879 	err = draw_tree_entries(view, parent_path);
6880 	free(parent_path);
6881 
6882 	view_border(view);
6883 	return err;
6884 }
6885 
6886 static const struct got_error *
6887 tree_goto_line(struct tog_view *view, int nlines)
6888 {
6889 	const struct got_error		 *err = NULL;
6890 	struct tog_tree_view_state	 *s = &view->state.tree;
6891 	struct got_tree_entry		**fte, **lte, **ste;
6892 	int				  g, last, first = 1, i = 1;
6893 	int				  root = s->tree == s->root;
6894 	int				  off = root ? 1 : 2;
6895 
6896 	g = view->gline;
6897 	view->gline = 0;
6898 
6899 	if (g == 0)
6900 		g = 1;
6901 	else if (g > got_object_tree_get_nentries(s->tree))
6902 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
6903 
6904 	fte = &s->first_displayed_entry;
6905 	lte = &s->last_displayed_entry;
6906 	ste = &s->selected_entry;
6907 
6908 	if (*fte != NULL) {
6909 		first = got_tree_entry_get_index(*fte);
6910 		first += off;  /* account for ".." */
6911 	}
6912 	last = got_tree_entry_get_index(*lte);
6913 	last += off;
6914 
6915 	if (g >= first && g <= last && g - first < nlines) {
6916 		s->selected = g - first;
6917 		return NULL;	/* gline is on the current page */
6918 	}
6919 
6920 	if (*ste != NULL) {
6921 		i = got_tree_entry_get_index(*ste);
6922 		i += off;
6923 	}
6924 
6925 	if (i < g) {
6926 		err = tree_scroll_down(view, g - i);
6927 		if (err)
6928 			return err;
6929 		if (got_tree_entry_get_index(*lte) >=
6930 		    got_object_tree_get_nentries(s->tree) - 1 &&
6931 		    first + s->selected < g &&
6932 		    s->selected < s->ndisplayed - 1) {
6933 			first = got_tree_entry_get_index(*fte);
6934 			first += off;
6935 			s->selected = g - first;
6936 		}
6937 	} else if (i > g)
6938 		tree_scroll_up(s, i - g);
6939 
6940 	if (g < nlines &&
6941 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
6942 		s->selected = g - 1;
6943 
6944 	return NULL;
6945 }
6946 
6947 static const struct got_error *
6948 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6949 {
6950 	const struct got_error *err = NULL;
6951 	struct tog_tree_view_state *s = &view->state.tree;
6952 	struct got_tree_entry *te;
6953 	int n, nscroll = view->nlines - 3;
6954 
6955 	if (view->gline)
6956 		return tree_goto_line(view, nscroll);
6957 
6958 	switch (ch) {
6959 	case 'i':
6960 		s->show_ids = !s->show_ids;
6961 		view->count = 0;
6962 		break;
6963 	case 'L':
6964 		view->count = 0;
6965 		if (!s->selected_entry)
6966 			break;
6967 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
6968 		break;
6969 	case 'R':
6970 		view->count = 0;
6971 		err = view_request_new(new_view, view, TOG_VIEW_REF);
6972 		break;
6973 	case 'g':
6974 	case KEY_HOME:
6975 		s->selected = 0;
6976 		view->count = 0;
6977 		if (s->tree == s->root)
6978 			s->first_displayed_entry =
6979 			    got_object_tree_get_first_entry(s->tree);
6980 		else
6981 			s->first_displayed_entry = NULL;
6982 		break;
6983 	case 'G':
6984 	case KEY_END: {
6985 		int eos = view->nlines - 3;
6986 
6987 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6988 			--eos;  /* border */
6989 		s->selected = 0;
6990 		view->count = 0;
6991 		te = got_object_tree_get_last_entry(s->tree);
6992 		for (n = 0; n < eos; n++) {
6993 			if (te == NULL) {
6994 				if (s->tree != s->root) {
6995 					s->first_displayed_entry = NULL;
6996 					n++;
6997 				}
6998 				break;
6999 			}
7000 			s->first_displayed_entry = te;
7001 			te = got_tree_entry_get_prev(s->tree, te);
7002 		}
7003 		if (n > 0)
7004 			s->selected = n - 1;
7005 		break;
7006 	}
7007 	case 'k':
7008 	case KEY_UP:
7009 	case CTRL('p'):
7010 		if (s->selected > 0) {
7011 			s->selected--;
7012 			break;
7013 		}
7014 		tree_scroll_up(s, 1);
7015 		if (s->selected_entry == NULL ||
7016 		    (s->tree == s->root && s->selected_entry ==
7017 		     got_object_tree_get_first_entry(s->tree)))
7018 			view->count = 0;
7019 		break;
7020 	case CTRL('u'):
7021 	case 'u':
7022 		nscroll /= 2;
7023 		/* FALL THROUGH */
7024 	case KEY_PPAGE:
7025 	case CTRL('b'):
7026 	case 'b':
7027 		if (s->tree == s->root) {
7028 			if (got_object_tree_get_first_entry(s->tree) ==
7029 			    s->first_displayed_entry)
7030 				s->selected -= MIN(s->selected, nscroll);
7031 		} else {
7032 			if (s->first_displayed_entry == NULL)
7033 				s->selected -= MIN(s->selected, nscroll);
7034 		}
7035 		tree_scroll_up(s, MAX(0, nscroll));
7036 		if (s->selected_entry == NULL ||
7037 		    (s->tree == s->root && s->selected_entry ==
7038 		     got_object_tree_get_first_entry(s->tree)))
7039 			view->count = 0;
7040 		break;
7041 	case 'j':
7042 	case KEY_DOWN:
7043 	case CTRL('n'):
7044 		if (s->selected < s->ndisplayed - 1) {
7045 			s->selected++;
7046 			break;
7047 		}
7048 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7049 		    == NULL) {
7050 			/* can't scroll any further */
7051 			view->count = 0;
7052 			break;
7053 		}
7054 		tree_scroll_down(view, 1);
7055 		break;
7056 	case CTRL('d'):
7057 	case 'd':
7058 		nscroll /= 2;
7059 		/* FALL THROUGH */
7060 	case KEY_NPAGE:
7061 	case CTRL('f'):
7062 	case 'f':
7063 	case ' ':
7064 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7065 		    == NULL) {
7066 			/* can't scroll any further; move cursor down */
7067 			if (s->selected < s->ndisplayed - 1)
7068 				s->selected += MIN(nscroll,
7069 				    s->ndisplayed - s->selected - 1);
7070 			else
7071 				view->count = 0;
7072 			break;
7073 		}
7074 		tree_scroll_down(view, nscroll);
7075 		break;
7076 	case KEY_ENTER:
7077 	case '\r':
7078 	case KEY_BACKSPACE:
7079 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7080 			struct tog_parent_tree *parent;
7081 			/* user selected '..' */
7082 			if (s->tree == s->root) {
7083 				view->count = 0;
7084 				break;
7085 			}
7086 			parent = TAILQ_FIRST(&s->parents);
7087 			TAILQ_REMOVE(&s->parents, parent,
7088 			    entry);
7089 			got_object_tree_close(s->tree);
7090 			s->tree = parent->tree;
7091 			s->first_displayed_entry =
7092 			    parent->first_displayed_entry;
7093 			s->selected_entry =
7094 			    parent->selected_entry;
7095 			s->selected = parent->selected;
7096 			if (s->selected > view->nlines - 3) {
7097 				err = offset_selection_down(view);
7098 				if (err)
7099 					break;
7100 			}
7101 			free(parent);
7102 		} else if (S_ISDIR(got_tree_entry_get_mode(
7103 		    s->selected_entry))) {
7104 			struct got_tree_object *subtree;
7105 			view->count = 0;
7106 			err = got_object_open_as_tree(&subtree, s->repo,
7107 			    got_tree_entry_get_id(s->selected_entry));
7108 			if (err)
7109 				break;
7110 			err = tree_view_visit_subtree(s, subtree);
7111 			if (err) {
7112 				got_object_tree_close(subtree);
7113 				break;
7114 			}
7115 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7116 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7117 		break;
7118 	case KEY_RESIZE:
7119 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7120 			s->selected = view->nlines - 4;
7121 		view->count = 0;
7122 		break;
7123 	default:
7124 		view->count = 0;
7125 		break;
7126 	}
7127 
7128 	return err;
7129 }
7130 
7131 __dead static void
7132 usage_tree(void)
7133 {
7134 	endwin();
7135 	fprintf(stderr,
7136 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7137 	    getprogname());
7138 	exit(1);
7139 }
7140 
7141 static const struct got_error *
7142 cmd_tree(int argc, char *argv[])
7143 {
7144 	const struct got_error *error;
7145 	struct got_repository *repo = NULL;
7146 	struct got_worktree *worktree = NULL;
7147 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7148 	struct got_object_id *commit_id = NULL;
7149 	struct got_commit_object *commit = NULL;
7150 	const char *commit_id_arg = NULL;
7151 	char *label = NULL;
7152 	struct got_reference *ref = NULL;
7153 	const char *head_ref_name = NULL;
7154 	int ch;
7155 	struct tog_view *view;
7156 	int *pack_fds = NULL;
7157 
7158 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7159 		switch (ch) {
7160 		case 'c':
7161 			commit_id_arg = optarg;
7162 			break;
7163 		case 'r':
7164 			repo_path = realpath(optarg, NULL);
7165 			if (repo_path == NULL)
7166 				return got_error_from_errno2("realpath",
7167 				    optarg);
7168 			break;
7169 		default:
7170 			usage_tree();
7171 			/* NOTREACHED */
7172 		}
7173 	}
7174 
7175 	argc -= optind;
7176 	argv += optind;
7177 
7178 	if (argc > 1)
7179 		usage_tree();
7180 
7181 	error = got_repo_pack_fds_open(&pack_fds);
7182 	if (error != NULL)
7183 		goto done;
7184 
7185 	if (repo_path == NULL) {
7186 		cwd = getcwd(NULL, 0);
7187 		if (cwd == NULL)
7188 			return got_error_from_errno("getcwd");
7189 		error = got_worktree_open(&worktree, cwd);
7190 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7191 			goto done;
7192 		if (worktree)
7193 			repo_path =
7194 			    strdup(got_worktree_get_repo_path(worktree));
7195 		else
7196 			repo_path = strdup(cwd);
7197 		if (repo_path == NULL) {
7198 			error = got_error_from_errno("strdup");
7199 			goto done;
7200 		}
7201 	}
7202 
7203 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7204 	if (error != NULL)
7205 		goto done;
7206 
7207 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7208 	    repo, worktree);
7209 	if (error)
7210 		goto done;
7211 
7212 	init_curses();
7213 
7214 	error = apply_unveil(got_repo_get_path(repo), NULL);
7215 	if (error)
7216 		goto done;
7217 
7218 	error = tog_load_refs(repo, 0);
7219 	if (error)
7220 		goto done;
7221 
7222 	if (commit_id_arg == NULL) {
7223 		error = got_repo_match_object_id(&commit_id, &label,
7224 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7225 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7226 		if (error)
7227 			goto done;
7228 		head_ref_name = label;
7229 	} else {
7230 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7231 		if (error == NULL)
7232 			head_ref_name = got_ref_get_name(ref);
7233 		else if (error->code != GOT_ERR_NOT_REF)
7234 			goto done;
7235 		error = got_repo_match_object_id(&commit_id, NULL,
7236 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7237 		if (error)
7238 			goto done;
7239 	}
7240 
7241 	error = got_object_open_as_commit(&commit, repo, commit_id);
7242 	if (error)
7243 		goto done;
7244 
7245 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7246 	if (view == NULL) {
7247 		error = got_error_from_errno("view_open");
7248 		goto done;
7249 	}
7250 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7251 	if (error)
7252 		goto done;
7253 	if (!got_path_is_root_dir(in_repo_path)) {
7254 		error = tree_view_walk_path(&view->state.tree, commit,
7255 		    in_repo_path);
7256 		if (error)
7257 			goto done;
7258 	}
7259 
7260 	if (worktree) {
7261 		/* Release work tree lock. */
7262 		got_worktree_close(worktree);
7263 		worktree = NULL;
7264 	}
7265 	error = view_loop(view);
7266 done:
7267 	free(repo_path);
7268 	free(cwd);
7269 	free(commit_id);
7270 	free(label);
7271 	if (ref)
7272 		got_ref_close(ref);
7273 	if (repo) {
7274 		const struct got_error *close_err = got_repo_close(repo);
7275 		if (error == NULL)
7276 			error = close_err;
7277 	}
7278 	if (pack_fds) {
7279 		const struct got_error *pack_err =
7280 		    got_repo_pack_fds_close(pack_fds);
7281 		if (error == NULL)
7282 			error = pack_err;
7283 	}
7284 	tog_free_refs();
7285 	return error;
7286 }
7287 
7288 static const struct got_error *
7289 ref_view_load_refs(struct tog_ref_view_state *s)
7290 {
7291 	struct got_reflist_entry *sre;
7292 	struct tog_reflist_entry *re;
7293 
7294 	s->nrefs = 0;
7295 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7296 		if (strncmp(got_ref_get_name(sre->ref),
7297 		    "refs/got/", 9) == 0 &&
7298 		    strncmp(got_ref_get_name(sre->ref),
7299 		    "refs/got/backup/", 16) != 0)
7300 			continue;
7301 
7302 		re = malloc(sizeof(*re));
7303 		if (re == NULL)
7304 			return got_error_from_errno("malloc");
7305 
7306 		re->ref = got_ref_dup(sre->ref);
7307 		if (re->ref == NULL)
7308 			return got_error_from_errno("got_ref_dup");
7309 		re->idx = s->nrefs++;
7310 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7311 	}
7312 
7313 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7314 	return NULL;
7315 }
7316 
7317 static void
7318 ref_view_free_refs(struct tog_ref_view_state *s)
7319 {
7320 	struct tog_reflist_entry *re;
7321 
7322 	while (!TAILQ_EMPTY(&s->refs)) {
7323 		re = TAILQ_FIRST(&s->refs);
7324 		TAILQ_REMOVE(&s->refs, re, entry);
7325 		got_ref_close(re->ref);
7326 		free(re);
7327 	}
7328 }
7329 
7330 static const struct got_error *
7331 open_ref_view(struct tog_view *view, struct got_repository *repo)
7332 {
7333 	const struct got_error *err = NULL;
7334 	struct tog_ref_view_state *s = &view->state.ref;
7335 
7336 	s->selected_entry = 0;
7337 	s->repo = repo;
7338 
7339 	TAILQ_INIT(&s->refs);
7340 	STAILQ_INIT(&s->colors);
7341 
7342 	err = ref_view_load_refs(s);
7343 	if (err)
7344 		return err;
7345 
7346 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7347 		err = add_color(&s->colors, "^refs/heads/",
7348 		    TOG_COLOR_REFS_HEADS,
7349 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7350 		if (err)
7351 			goto done;
7352 
7353 		err = add_color(&s->colors, "^refs/tags/",
7354 		    TOG_COLOR_REFS_TAGS,
7355 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7356 		if (err)
7357 			goto done;
7358 
7359 		err = add_color(&s->colors, "^refs/remotes/",
7360 		    TOG_COLOR_REFS_REMOTES,
7361 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7362 		if (err)
7363 			goto done;
7364 
7365 		err = add_color(&s->colors, "^refs/got/backup/",
7366 		    TOG_COLOR_REFS_BACKUP,
7367 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7368 		if (err)
7369 			goto done;
7370 	}
7371 
7372 	view->show = show_ref_view;
7373 	view->input = input_ref_view;
7374 	view->close = close_ref_view;
7375 	view->search_start = search_start_ref_view;
7376 	view->search_next = search_next_ref_view;
7377 done:
7378 	if (err)
7379 		free_colors(&s->colors);
7380 	return err;
7381 }
7382 
7383 static const struct got_error *
7384 close_ref_view(struct tog_view *view)
7385 {
7386 	struct tog_ref_view_state *s = &view->state.ref;
7387 
7388 	ref_view_free_refs(s);
7389 	free_colors(&s->colors);
7390 
7391 	return NULL;
7392 }
7393 
7394 static const struct got_error *
7395 resolve_reflist_entry(struct got_object_id **commit_id,
7396     struct tog_reflist_entry *re, struct got_repository *repo)
7397 {
7398 	const struct got_error *err = NULL;
7399 	struct got_object_id *obj_id;
7400 	struct got_tag_object *tag = NULL;
7401 	int obj_type;
7402 
7403 	*commit_id = NULL;
7404 
7405 	err = got_ref_resolve(&obj_id, repo, re->ref);
7406 	if (err)
7407 		return err;
7408 
7409 	err = got_object_get_type(&obj_type, repo, obj_id);
7410 	if (err)
7411 		goto done;
7412 
7413 	switch (obj_type) {
7414 	case GOT_OBJ_TYPE_COMMIT:
7415 		*commit_id = obj_id;
7416 		break;
7417 	case GOT_OBJ_TYPE_TAG:
7418 		err = got_object_open_as_tag(&tag, repo, obj_id);
7419 		if (err)
7420 			goto done;
7421 		free(obj_id);
7422 		err = got_object_get_type(&obj_type, repo,
7423 		    got_object_tag_get_object_id(tag));
7424 		if (err)
7425 			goto done;
7426 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7427 			err = got_error(GOT_ERR_OBJ_TYPE);
7428 			goto done;
7429 		}
7430 		*commit_id = got_object_id_dup(
7431 		    got_object_tag_get_object_id(tag));
7432 		if (*commit_id == NULL) {
7433 			err = got_error_from_errno("got_object_id_dup");
7434 			goto done;
7435 		}
7436 		break;
7437 	default:
7438 		err = got_error(GOT_ERR_OBJ_TYPE);
7439 		break;
7440 	}
7441 
7442 done:
7443 	if (tag)
7444 		got_object_tag_close(tag);
7445 	if (err) {
7446 		free(*commit_id);
7447 		*commit_id = NULL;
7448 	}
7449 	return err;
7450 }
7451 
7452 static const struct got_error *
7453 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7454     struct tog_reflist_entry *re, struct got_repository *repo)
7455 {
7456 	struct tog_view *log_view;
7457 	const struct got_error *err = NULL;
7458 	struct got_object_id *commit_id = NULL;
7459 
7460 	*new_view = NULL;
7461 
7462 	err = resolve_reflist_entry(&commit_id, re, repo);
7463 	if (err) {
7464 		if (err->code != GOT_ERR_OBJ_TYPE)
7465 			return err;
7466 		else
7467 			return NULL;
7468 	}
7469 
7470 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7471 	if (log_view == NULL) {
7472 		err = got_error_from_errno("view_open");
7473 		goto done;
7474 	}
7475 
7476 	err = open_log_view(log_view, commit_id, repo,
7477 	    got_ref_get_name(re->ref), "", 0);
7478 done:
7479 	if (err)
7480 		view_close(log_view);
7481 	else
7482 		*new_view = log_view;
7483 	free(commit_id);
7484 	return err;
7485 }
7486 
7487 static void
7488 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7489 {
7490 	struct tog_reflist_entry *re;
7491 	int i = 0;
7492 
7493 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7494 		return;
7495 
7496 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7497 	while (i++ < maxscroll) {
7498 		if (re == NULL)
7499 			break;
7500 		s->first_displayed_entry = re;
7501 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7502 	}
7503 }
7504 
7505 static const struct got_error *
7506 ref_scroll_down(struct tog_view *view, int maxscroll)
7507 {
7508 	struct tog_ref_view_state *s = &view->state.ref;
7509 	struct tog_reflist_entry *next, *last;
7510 	int n = 0;
7511 
7512 	if (s->first_displayed_entry)
7513 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7514 	else
7515 		next = TAILQ_FIRST(&s->refs);
7516 
7517 	last = s->last_displayed_entry;
7518 	while (next && n++ < maxscroll) {
7519 		if (last) {
7520 			s->last_displayed_entry = last;
7521 			last = TAILQ_NEXT(last, entry);
7522 		}
7523 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7524 			s->first_displayed_entry = next;
7525 			next = TAILQ_NEXT(next, entry);
7526 		}
7527 	}
7528 
7529 	return NULL;
7530 }
7531 
7532 static const struct got_error *
7533 search_start_ref_view(struct tog_view *view)
7534 {
7535 	struct tog_ref_view_state *s = &view->state.ref;
7536 
7537 	s->matched_entry = NULL;
7538 	return NULL;
7539 }
7540 
7541 static int
7542 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7543 {
7544 	regmatch_t regmatch;
7545 
7546 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7547 	    0) == 0;
7548 }
7549 
7550 static const struct got_error *
7551 search_next_ref_view(struct tog_view *view)
7552 {
7553 	struct tog_ref_view_state *s = &view->state.ref;
7554 	struct tog_reflist_entry *re = NULL;
7555 
7556 	if (!view->searching) {
7557 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7558 		return NULL;
7559 	}
7560 
7561 	if (s->matched_entry) {
7562 		if (view->searching == TOG_SEARCH_FORWARD) {
7563 			if (s->selected_entry)
7564 				re = TAILQ_NEXT(s->selected_entry, entry);
7565 			else
7566 				re = TAILQ_PREV(s->selected_entry,
7567 				    tog_reflist_head, entry);
7568 		} else {
7569 			if (s->selected_entry == NULL)
7570 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7571 			else
7572 				re = TAILQ_PREV(s->selected_entry,
7573 				    tog_reflist_head, entry);
7574 		}
7575 	} else {
7576 		if (s->selected_entry)
7577 			re = s->selected_entry;
7578 		else if (view->searching == TOG_SEARCH_FORWARD)
7579 			re = TAILQ_FIRST(&s->refs);
7580 		else
7581 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7582 	}
7583 
7584 	while (1) {
7585 		if (re == NULL) {
7586 			if (s->matched_entry == NULL) {
7587 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7588 				return NULL;
7589 			}
7590 			if (view->searching == TOG_SEARCH_FORWARD)
7591 				re = TAILQ_FIRST(&s->refs);
7592 			else
7593 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7594 		}
7595 
7596 		if (match_reflist_entry(re, &view->regex)) {
7597 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7598 			s->matched_entry = re;
7599 			break;
7600 		}
7601 
7602 		if (view->searching == TOG_SEARCH_FORWARD)
7603 			re = TAILQ_NEXT(re, entry);
7604 		else
7605 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7606 	}
7607 
7608 	if (s->matched_entry) {
7609 		s->first_displayed_entry = s->matched_entry;
7610 		s->selected = 0;
7611 	}
7612 
7613 	return NULL;
7614 }
7615 
7616 static const struct got_error *
7617 show_ref_view(struct tog_view *view)
7618 {
7619 	const struct got_error *err = NULL;
7620 	struct tog_ref_view_state *s = &view->state.ref;
7621 	struct tog_reflist_entry *re;
7622 	char *line = NULL;
7623 	wchar_t *wline;
7624 	struct tog_color *tc;
7625 	int width, n;
7626 	int limit = view->nlines;
7627 
7628 	werase(view->window);
7629 
7630 	s->ndisplayed = 0;
7631 	if (view_is_hsplit_top(view))
7632 		--limit;  /* border */
7633 
7634 	if (limit == 0)
7635 		return NULL;
7636 
7637 	re = s->first_displayed_entry;
7638 
7639 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7640 	    s->nrefs) == -1)
7641 		return got_error_from_errno("asprintf");
7642 
7643 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7644 	if (err) {
7645 		free(line);
7646 		return err;
7647 	}
7648 	if (view_needs_focus_indication(view))
7649 		wstandout(view->window);
7650 	waddwstr(view->window, wline);
7651 	if (view_needs_focus_indication(view))
7652 		wstandend(view->window);
7653 	free(wline);
7654 	wline = NULL;
7655 	free(line);
7656 	line = NULL;
7657 	if (width < view->ncols - 1)
7658 		waddch(view->window, '\n');
7659 	if (--limit <= 0)
7660 		return NULL;
7661 
7662 	n = 0;
7663 	while (re && limit > 0) {
7664 		char *line = NULL;
7665 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7666 
7667 		if (s->show_date) {
7668 			struct got_commit_object *ci;
7669 			struct got_tag_object *tag;
7670 			struct got_object_id *id;
7671 			struct tm tm;
7672 			time_t t;
7673 
7674 			err = got_ref_resolve(&id, s->repo, re->ref);
7675 			if (err)
7676 				return err;
7677 			err = got_object_open_as_tag(&tag, s->repo, id);
7678 			if (err) {
7679 				if (err->code != GOT_ERR_OBJ_TYPE) {
7680 					free(id);
7681 					return err;
7682 				}
7683 				err = got_object_open_as_commit(&ci, s->repo,
7684 				    id);
7685 				if (err) {
7686 					free(id);
7687 					return err;
7688 				}
7689 				t = got_object_commit_get_committer_time(ci);
7690 				got_object_commit_close(ci);
7691 			} else {
7692 				t = got_object_tag_get_tagger_time(tag);
7693 				got_object_tag_close(tag);
7694 			}
7695 			free(id);
7696 			if (gmtime_r(&t, &tm) == NULL)
7697 				return got_error_from_errno("gmtime_r");
7698 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7699 				return got_error(GOT_ERR_NO_SPACE);
7700 		}
7701 		if (got_ref_is_symbolic(re->ref)) {
7702 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7703 			    ymd : "", got_ref_get_name(re->ref),
7704 			    got_ref_get_symref_target(re->ref)) == -1)
7705 				return got_error_from_errno("asprintf");
7706 		} else if (s->show_ids) {
7707 			struct got_object_id *id;
7708 			char *id_str;
7709 			err = got_ref_resolve(&id, s->repo, re->ref);
7710 			if (err)
7711 				return err;
7712 			err = got_object_id_str(&id_str, id);
7713 			if (err) {
7714 				free(id);
7715 				return err;
7716 			}
7717 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7718 			    got_ref_get_name(re->ref), id_str) == -1) {
7719 				err = got_error_from_errno("asprintf");
7720 				free(id);
7721 				free(id_str);
7722 				return err;
7723 			}
7724 			free(id);
7725 			free(id_str);
7726 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7727 		    got_ref_get_name(re->ref)) == -1)
7728 			return got_error_from_errno("asprintf");
7729 
7730 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7731 		    0, 0);
7732 		if (err) {
7733 			free(line);
7734 			return err;
7735 		}
7736 		if (n == s->selected) {
7737 			if (view->focussed)
7738 				wstandout(view->window);
7739 			s->selected_entry = re;
7740 		}
7741 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7742 		if (tc)
7743 			wattr_on(view->window,
7744 			    COLOR_PAIR(tc->colorpair), NULL);
7745 		waddwstr(view->window, wline);
7746 		if (tc)
7747 			wattr_off(view->window,
7748 			    COLOR_PAIR(tc->colorpair), NULL);
7749 		if (width < view->ncols - 1)
7750 			waddch(view->window, '\n');
7751 		if (n == s->selected && view->focussed)
7752 			wstandend(view->window);
7753 		free(line);
7754 		free(wline);
7755 		wline = NULL;
7756 		n++;
7757 		s->ndisplayed++;
7758 		s->last_displayed_entry = re;
7759 
7760 		limit--;
7761 		re = TAILQ_NEXT(re, entry);
7762 	}
7763 
7764 	view_border(view);
7765 	return err;
7766 }
7767 
7768 static const struct got_error *
7769 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7770     struct tog_reflist_entry *re, struct got_repository *repo)
7771 {
7772 	const struct got_error *err = NULL;
7773 	struct got_object_id *commit_id = NULL;
7774 	struct tog_view *tree_view;
7775 
7776 	*new_view = NULL;
7777 
7778 	err = resolve_reflist_entry(&commit_id, re, repo);
7779 	if (err) {
7780 		if (err->code != GOT_ERR_OBJ_TYPE)
7781 			return err;
7782 		else
7783 			return NULL;
7784 	}
7785 
7786 
7787 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7788 	if (tree_view == NULL) {
7789 		err = got_error_from_errno("view_open");
7790 		goto done;
7791 	}
7792 
7793 	err = open_tree_view(tree_view, commit_id,
7794 	    got_ref_get_name(re->ref), repo);
7795 	if (err)
7796 		goto done;
7797 
7798 	*new_view = tree_view;
7799 done:
7800 	free(commit_id);
7801 	return err;
7802 }
7803 
7804 static const struct got_error *
7805 ref_goto_line(struct tog_view *view, int nlines)
7806 {
7807 	const struct got_error		*err = NULL;
7808 	struct tog_ref_view_state	*s = &view->state.ref;
7809 	int				 g, idx = s->selected_entry->idx;
7810 
7811 	g = view->gline;
7812 	view->gline = 0;
7813 
7814 	if (g == 0)
7815 		g = 1;
7816 	else if (g > s->nrefs)
7817 		g = s->nrefs;
7818 
7819 	if (g >= s->first_displayed_entry->idx + 1 &&
7820 	    g <= s->last_displayed_entry->idx + 1 &&
7821 	    g - s->first_displayed_entry->idx - 1 < nlines) {
7822 		s->selected = g - s->first_displayed_entry->idx - 1;
7823 		return NULL;
7824 	}
7825 
7826 	if (idx + 1 < g) {
7827 		err = ref_scroll_down(view, g - idx - 1);
7828 		if (err)
7829 			return err;
7830 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
7831 		    s->first_displayed_entry->idx + s->selected < g &&
7832 		    s->selected < s->ndisplayed - 1)
7833 			s->selected = g - s->first_displayed_entry->idx - 1;
7834 	} else if (idx + 1 > g)
7835 		ref_scroll_up(s, idx - g + 1);
7836 
7837 	if (g < nlines && s->first_displayed_entry->idx == 0)
7838 		s->selected = g - 1;
7839 
7840 	return NULL;
7841 
7842 }
7843 
7844 static const struct got_error *
7845 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7846 {
7847 	const struct got_error *err = NULL;
7848 	struct tog_ref_view_state *s = &view->state.ref;
7849 	struct tog_reflist_entry *re;
7850 	int n, nscroll = view->nlines - 1;
7851 
7852 	if (view->gline)
7853 		return ref_goto_line(view, nscroll);
7854 
7855 	switch (ch) {
7856 	case 'i':
7857 		s->show_ids = !s->show_ids;
7858 		view->count = 0;
7859 		break;
7860 	case 'm':
7861 		s->show_date = !s->show_date;
7862 		view->count = 0;
7863 		break;
7864 	case 'o':
7865 		s->sort_by_date = !s->sort_by_date;
7866 		view->count = 0;
7867 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7868 		    got_ref_cmp_by_commit_timestamp_descending :
7869 		    tog_ref_cmp_by_name, s->repo);
7870 		if (err)
7871 			break;
7872 		got_reflist_object_id_map_free(tog_refs_idmap);
7873 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7874 		    &tog_refs, s->repo);
7875 		if (err)
7876 			break;
7877 		ref_view_free_refs(s);
7878 		err = ref_view_load_refs(s);
7879 		break;
7880 	case KEY_ENTER:
7881 	case '\r':
7882 		view->count = 0;
7883 		if (!s->selected_entry)
7884 			break;
7885 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7886 		break;
7887 	case 'T':
7888 		view->count = 0;
7889 		if (!s->selected_entry)
7890 			break;
7891 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
7892 		break;
7893 	case 'g':
7894 	case KEY_HOME:
7895 		s->selected = 0;
7896 		view->count = 0;
7897 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7898 		break;
7899 	case 'G':
7900 	case KEY_END: {
7901 		int eos = view->nlines - 1;
7902 
7903 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7904 			--eos;  /* border */
7905 		s->selected = 0;
7906 		view->count = 0;
7907 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7908 		for (n = 0; n < eos; n++) {
7909 			if (re == NULL)
7910 				break;
7911 			s->first_displayed_entry = re;
7912 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7913 		}
7914 		if (n > 0)
7915 			s->selected = n - 1;
7916 		break;
7917 	}
7918 	case 'k':
7919 	case KEY_UP:
7920 	case CTRL('p'):
7921 		if (s->selected > 0) {
7922 			s->selected--;
7923 			break;
7924 		}
7925 		ref_scroll_up(s, 1);
7926 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7927 			view->count = 0;
7928 		break;
7929 	case CTRL('u'):
7930 	case 'u':
7931 		nscroll /= 2;
7932 		/* FALL THROUGH */
7933 	case KEY_PPAGE:
7934 	case CTRL('b'):
7935 	case 'b':
7936 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7937 			s->selected -= MIN(nscroll, s->selected);
7938 		ref_scroll_up(s, MAX(0, nscroll));
7939 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7940 			view->count = 0;
7941 		break;
7942 	case 'j':
7943 	case KEY_DOWN:
7944 	case CTRL('n'):
7945 		if (s->selected < s->ndisplayed - 1) {
7946 			s->selected++;
7947 			break;
7948 		}
7949 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7950 			/* can't scroll any further */
7951 			view->count = 0;
7952 			break;
7953 		}
7954 		ref_scroll_down(view, 1);
7955 		break;
7956 	case CTRL('d'):
7957 	case 'd':
7958 		nscroll /= 2;
7959 		/* FALL THROUGH */
7960 	case KEY_NPAGE:
7961 	case CTRL('f'):
7962 	case 'f':
7963 	case ' ':
7964 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7965 			/* can't scroll any further; move cursor down */
7966 			if (s->selected < s->ndisplayed - 1)
7967 				s->selected += MIN(nscroll,
7968 				    s->ndisplayed - s->selected - 1);
7969 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7970 				s->selected += s->ndisplayed - s->selected - 1;
7971 			view->count = 0;
7972 			break;
7973 		}
7974 		ref_scroll_down(view, nscroll);
7975 		break;
7976 	case CTRL('l'):
7977 		view->count = 0;
7978 		tog_free_refs();
7979 		err = tog_load_refs(s->repo, s->sort_by_date);
7980 		if (err)
7981 			break;
7982 		ref_view_free_refs(s);
7983 		err = ref_view_load_refs(s);
7984 		break;
7985 	case KEY_RESIZE:
7986 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7987 			s->selected = view->nlines - 2;
7988 		break;
7989 	default:
7990 		view->count = 0;
7991 		break;
7992 	}
7993 
7994 	return err;
7995 }
7996 
7997 __dead static void
7998 usage_ref(void)
7999 {
8000 	endwin();
8001 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8002 	    getprogname());
8003 	exit(1);
8004 }
8005 
8006 static const struct got_error *
8007 cmd_ref(int argc, char *argv[])
8008 {
8009 	const struct got_error *error;
8010 	struct got_repository *repo = NULL;
8011 	struct got_worktree *worktree = NULL;
8012 	char *cwd = NULL, *repo_path = NULL;
8013 	int ch;
8014 	struct tog_view *view;
8015 	int *pack_fds = NULL;
8016 
8017 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8018 		switch (ch) {
8019 		case 'r':
8020 			repo_path = realpath(optarg, NULL);
8021 			if (repo_path == NULL)
8022 				return got_error_from_errno2("realpath",
8023 				    optarg);
8024 			break;
8025 		default:
8026 			usage_ref();
8027 			/* NOTREACHED */
8028 		}
8029 	}
8030 
8031 	argc -= optind;
8032 	argv += optind;
8033 
8034 	if (argc > 1)
8035 		usage_ref();
8036 
8037 	error = got_repo_pack_fds_open(&pack_fds);
8038 	if (error != NULL)
8039 		goto done;
8040 
8041 	if (repo_path == NULL) {
8042 		cwd = getcwd(NULL, 0);
8043 		if (cwd == NULL)
8044 			return got_error_from_errno("getcwd");
8045 		error = got_worktree_open(&worktree, cwd);
8046 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8047 			goto done;
8048 		if (worktree)
8049 			repo_path =
8050 			    strdup(got_worktree_get_repo_path(worktree));
8051 		else
8052 			repo_path = strdup(cwd);
8053 		if (repo_path == NULL) {
8054 			error = got_error_from_errno("strdup");
8055 			goto done;
8056 		}
8057 	}
8058 
8059 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8060 	if (error != NULL)
8061 		goto done;
8062 
8063 	init_curses();
8064 
8065 	error = apply_unveil(got_repo_get_path(repo), NULL);
8066 	if (error)
8067 		goto done;
8068 
8069 	error = tog_load_refs(repo, 0);
8070 	if (error)
8071 		goto done;
8072 
8073 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8074 	if (view == NULL) {
8075 		error = got_error_from_errno("view_open");
8076 		goto done;
8077 	}
8078 
8079 	error = open_ref_view(view, repo);
8080 	if (error)
8081 		goto done;
8082 
8083 	if (worktree) {
8084 		/* Release work tree lock. */
8085 		got_worktree_close(worktree);
8086 		worktree = NULL;
8087 	}
8088 	error = view_loop(view);
8089 done:
8090 	free(repo_path);
8091 	free(cwd);
8092 	if (repo) {
8093 		const struct got_error *close_err = got_repo_close(repo);
8094 		if (close_err)
8095 			error = close_err;
8096 	}
8097 	if (pack_fds) {
8098 		const struct got_error *pack_err =
8099 		    got_repo_pack_fds_close(pack_fds);
8100 		if (error == NULL)
8101 			error = pack_err;
8102 	}
8103 	tog_free_refs();
8104 	return error;
8105 }
8106 
8107 static const struct got_error *
8108 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8109     enum tog_view_type request, int y, int x)
8110 {
8111 	const struct got_error *err = NULL;
8112 
8113 	*new_view = NULL;
8114 
8115 	switch (request) {
8116 	case TOG_VIEW_DIFF:
8117 		if (view->type == TOG_VIEW_LOG) {
8118 			struct tog_log_view_state *s = &view->state.log;
8119 
8120 			err = open_diff_view_for_commit(new_view, y, x,
8121 			    s->selected_entry->commit, s->selected_entry->id,
8122 			    view, s->repo);
8123 		} else
8124 			return got_error_msg(GOT_ERR_NOT_IMPL,
8125 			    "parent/child view pair not supported");
8126 		break;
8127 	case TOG_VIEW_BLAME:
8128 		if (view->type == TOG_VIEW_TREE) {
8129 			struct tog_tree_view_state *s = &view->state.tree;
8130 
8131 			err = blame_tree_entry(new_view, y, x,
8132 			    s->selected_entry, &s->parents, s->commit_id,
8133 			    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_LOG:
8139 		if (view->type == TOG_VIEW_BLAME)
8140 			err = log_annotated_line(new_view, y, x,
8141 			    view->state.blame.repo, view->state.blame.id_to_log);
8142 		else if (view->type == TOG_VIEW_TREE)
8143 			err = log_selected_tree_entry(new_view, y, x,
8144 			    &view->state.tree);
8145 		else if (view->type == TOG_VIEW_REF)
8146 			err = log_ref_entry(new_view, y, x,
8147 			    view->state.ref.selected_entry,
8148 			    view->state.ref.repo);
8149 		else
8150 			return got_error_msg(GOT_ERR_NOT_IMPL,
8151 			    "parent/child view pair not supported");
8152 		break;
8153 	case TOG_VIEW_TREE:
8154 		if (view->type == TOG_VIEW_LOG)
8155 			err = browse_commit_tree(new_view, y, x,
8156 			    view->state.log.selected_entry,
8157 			    view->state.log.in_repo_path,
8158 			    view->state.log.head_ref_name,
8159 			    view->state.log.repo);
8160 		else if (view->type == TOG_VIEW_REF)
8161 			err = browse_ref_tree(new_view, y, x,
8162 			    view->state.ref.selected_entry,
8163 			    view->state.ref.repo);
8164 		else
8165 			return got_error_msg(GOT_ERR_NOT_IMPL,
8166 			    "parent/child view pair not supported");
8167 		break;
8168 	case TOG_VIEW_REF:
8169 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8170 		if (*new_view == NULL)
8171 			return got_error_from_errno("view_open");
8172 		if (view->type == TOG_VIEW_LOG)
8173 			err = open_ref_view(*new_view, view->state.log.repo);
8174 		else if (view->type == TOG_VIEW_TREE)
8175 			err = open_ref_view(*new_view, view->state.tree.repo);
8176 		else
8177 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8178 			    "parent/child view pair not supported");
8179 		if (err)
8180 			view_close(*new_view);
8181 		break;
8182 	default:
8183 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8184 	}
8185 
8186 	return err;
8187 }
8188 
8189 /*
8190  * If view was scrolled down to move the selected line into view when opening a
8191  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8192  */
8193 static void
8194 offset_selection_up(struct tog_view *view)
8195 {
8196 	switch (view->type) {
8197 	case TOG_VIEW_BLAME: {
8198 		struct tog_blame_view_state *s = &view->state.blame;
8199 		if (s->first_displayed_line == 1) {
8200 			s->selected_line = MAX(s->selected_line - view->offset,
8201 			    1);
8202 			break;
8203 		}
8204 		if (s->first_displayed_line > view->offset)
8205 			s->first_displayed_line -= view->offset;
8206 		else
8207 			s->first_displayed_line = 1;
8208 		s->selected_line += view->offset;
8209 		break;
8210 	}
8211 	case TOG_VIEW_LOG:
8212 		log_scroll_up(&view->state.log, view->offset);
8213 		view->state.log.selected += view->offset;
8214 		break;
8215 	case TOG_VIEW_REF:
8216 		ref_scroll_up(&view->state.ref, view->offset);
8217 		view->state.ref.selected += view->offset;
8218 		break;
8219 	case TOG_VIEW_TREE:
8220 		tree_scroll_up(&view->state.tree, view->offset);
8221 		view->state.tree.selected += view->offset;
8222 		break;
8223 	default:
8224 		break;
8225 	}
8226 
8227 	view->offset = 0;
8228 }
8229 
8230 /*
8231  * If the selected line is in the section of screen covered by the bottom split,
8232  * scroll down offset lines to move it into view and index its new position.
8233  */
8234 static const struct got_error *
8235 offset_selection_down(struct tog_view *view)
8236 {
8237 	const struct got_error	*err = NULL;
8238 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8239 	int			*selected = NULL;
8240 	int			 header, offset;
8241 
8242 	switch (view->type) {
8243 	case TOG_VIEW_BLAME: {
8244 		struct tog_blame_view_state *s = &view->state.blame;
8245 		header = 3;
8246 		scrolld = NULL;
8247 		if (s->selected_line > view->nlines - header) {
8248 			offset = abs(view->nlines - s->selected_line - header);
8249 			s->first_displayed_line += offset;
8250 			s->selected_line -= offset;
8251 			view->offset = offset;
8252 		}
8253 		break;
8254 	}
8255 	case TOG_VIEW_LOG: {
8256 		struct tog_log_view_state *s = &view->state.log;
8257 		scrolld = &log_scroll_down;
8258 		header = view_is_parent_view(view) ? 3 : 2;
8259 		selected = &s->selected;
8260 		break;
8261 	}
8262 	case TOG_VIEW_REF: {
8263 		struct tog_ref_view_state *s = &view->state.ref;
8264 		scrolld = &ref_scroll_down;
8265 		header = 3;
8266 		selected = &s->selected;
8267 		break;
8268 	}
8269 	case TOG_VIEW_TREE: {
8270 		struct tog_tree_view_state *s = &view->state.tree;
8271 		scrolld = &tree_scroll_down;
8272 		header = 5;
8273 		selected = &s->selected;
8274 		break;
8275 	}
8276 	default:
8277 		selected = NULL;
8278 		scrolld = NULL;
8279 		header = 0;
8280 		break;
8281 	}
8282 
8283 	if (selected && *selected > view->nlines - header) {
8284 		offset = abs(view->nlines - *selected - header);
8285 		view->offset = offset;
8286 		if (scrolld && offset) {
8287 			err = scrolld(view, offset);
8288 			*selected -= offset;
8289 		}
8290 	}
8291 
8292 	return err;
8293 }
8294 
8295 static void
8296 list_commands(FILE *fp)
8297 {
8298 	size_t i;
8299 
8300 	fprintf(fp, "commands:");
8301 	for (i = 0; i < nitems(tog_commands); i++) {
8302 		const struct tog_cmd *cmd = &tog_commands[i];
8303 		fprintf(fp, " %s", cmd->name);
8304 	}
8305 	fputc('\n', fp);
8306 }
8307 
8308 __dead static void
8309 usage(int hflag, int status)
8310 {
8311 	FILE *fp = (status == 0) ? stdout : stderr;
8312 
8313 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8314 	    getprogname());
8315 	if (hflag) {
8316 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8317 		list_commands(fp);
8318 	}
8319 	exit(status);
8320 }
8321 
8322 static char **
8323 make_argv(int argc, ...)
8324 {
8325 	va_list ap;
8326 	char **argv;
8327 	int i;
8328 
8329 	va_start(ap, argc);
8330 
8331 	argv = calloc(argc, sizeof(char *));
8332 	if (argv == NULL)
8333 		err(1, "calloc");
8334 	for (i = 0; i < argc; i++) {
8335 		argv[i] = strdup(va_arg(ap, char *));
8336 		if (argv[i] == NULL)
8337 			err(1, "strdup");
8338 	}
8339 
8340 	va_end(ap);
8341 	return argv;
8342 }
8343 
8344 /*
8345  * Try to convert 'tog path' into a 'tog log path' command.
8346  * The user could simply have mistyped the command rather than knowingly
8347  * provided a path. So check whether argv[0] can in fact be resolved
8348  * to a path in the HEAD commit and print a special error if not.
8349  * This hack is for mpi@ <3
8350  */
8351 static const struct got_error *
8352 tog_log_with_path(int argc, char *argv[])
8353 {
8354 	const struct got_error *error = NULL, *close_err;
8355 	const struct tog_cmd *cmd = NULL;
8356 	struct got_repository *repo = NULL;
8357 	struct got_worktree *worktree = NULL;
8358 	struct got_object_id *commit_id = NULL, *id = NULL;
8359 	struct got_commit_object *commit = NULL;
8360 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8361 	char *commit_id_str = NULL, **cmd_argv = NULL;
8362 	int *pack_fds = NULL;
8363 
8364 	cwd = getcwd(NULL, 0);
8365 	if (cwd == NULL)
8366 		return got_error_from_errno("getcwd");
8367 
8368 	error = got_repo_pack_fds_open(&pack_fds);
8369 	if (error != NULL)
8370 		goto done;
8371 
8372 	error = got_worktree_open(&worktree, cwd);
8373 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8374 		goto done;
8375 
8376 	if (worktree)
8377 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8378 	else
8379 		repo_path = strdup(cwd);
8380 	if (repo_path == NULL) {
8381 		error = got_error_from_errno("strdup");
8382 		goto done;
8383 	}
8384 
8385 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8386 	if (error != NULL)
8387 		goto done;
8388 
8389 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8390 	    repo, worktree);
8391 	if (error)
8392 		goto done;
8393 
8394 	error = tog_load_refs(repo, 0);
8395 	if (error)
8396 		goto done;
8397 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8398 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8399 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8400 	if (error)
8401 		goto done;
8402 
8403 	if (worktree) {
8404 		got_worktree_close(worktree);
8405 		worktree = NULL;
8406 	}
8407 
8408 	error = got_object_open_as_commit(&commit, repo, commit_id);
8409 	if (error)
8410 		goto done;
8411 
8412 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8413 	if (error) {
8414 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8415 			goto done;
8416 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8417 		    getprogname(), argv[0]);
8418 		usage(1, 1);
8419 		/* not reached */
8420 	}
8421 
8422 	error = got_object_id_str(&commit_id_str, commit_id);
8423 	if (error)
8424 		goto done;
8425 
8426 	cmd = &tog_commands[0]; /* log */
8427 	argc = 4;
8428 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8429 	error = cmd->cmd_main(argc, cmd_argv);
8430 done:
8431 	if (repo) {
8432 		close_err = got_repo_close(repo);
8433 		if (error == NULL)
8434 			error = close_err;
8435 	}
8436 	if (commit)
8437 		got_object_commit_close(commit);
8438 	if (worktree)
8439 		got_worktree_close(worktree);
8440 	if (pack_fds) {
8441 		const struct got_error *pack_err =
8442 		    got_repo_pack_fds_close(pack_fds);
8443 		if (error == NULL)
8444 			error = pack_err;
8445 	}
8446 	free(id);
8447 	free(commit_id_str);
8448 	free(commit_id);
8449 	free(cwd);
8450 	free(repo_path);
8451 	free(in_repo_path);
8452 	if (cmd_argv) {
8453 		int i;
8454 		for (i = 0; i < argc; i++)
8455 			free(cmd_argv[i]);
8456 		free(cmd_argv);
8457 	}
8458 	tog_free_refs();
8459 	return error;
8460 }
8461 
8462 int
8463 main(int argc, char *argv[])
8464 {
8465 	const struct got_error *error = NULL;
8466 	const struct tog_cmd *cmd = NULL;
8467 	int ch, hflag = 0, Vflag = 0;
8468 	char **cmd_argv = NULL;
8469 	static const struct option longopts[] = {
8470 	    { "version", no_argument, NULL, 'V' },
8471 	    { NULL, 0, NULL, 0}
8472 	};
8473 	char *diff_algo_str = NULL;
8474 
8475 	setlocale(LC_CTYPE, "");
8476 
8477 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8478 		switch (ch) {
8479 		case 'h':
8480 			hflag = 1;
8481 			break;
8482 		case 'V':
8483 			Vflag = 1;
8484 			break;
8485 		default:
8486 			usage(hflag, 1);
8487 			/* NOTREACHED */
8488 		}
8489 	}
8490 
8491 	argc -= optind;
8492 	argv += optind;
8493 	optind = 1;
8494 	optreset = 1;
8495 
8496 	if (Vflag) {
8497 		got_version_print_str();
8498 		return 0;
8499 	}
8500 
8501 #ifndef PROFILE
8502 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8503 	    NULL) == -1)
8504 		err(1, "pledge");
8505 #endif
8506 
8507 	if (argc == 0) {
8508 		if (hflag)
8509 			usage(hflag, 0);
8510 		/* Build an argument vector which runs a default command. */
8511 		cmd = &tog_commands[0];
8512 		argc = 1;
8513 		cmd_argv = make_argv(argc, cmd->name);
8514 	} else {
8515 		size_t i;
8516 
8517 		/* Did the user specify a command? */
8518 		for (i = 0; i < nitems(tog_commands); i++) {
8519 			if (strncmp(tog_commands[i].name, argv[0],
8520 			    strlen(argv[0])) == 0) {
8521 				cmd = &tog_commands[i];
8522 				break;
8523 			}
8524 		}
8525 	}
8526 
8527 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8528 	if (diff_algo_str) {
8529 		if (strcasecmp(diff_algo_str, "patience") == 0)
8530 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8531 		if (strcasecmp(diff_algo_str, "myers") == 0)
8532 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8533 	}
8534 
8535 	if (cmd == NULL) {
8536 		if (argc != 1)
8537 			usage(0, 1);
8538 		/* No command specified; try log with a path */
8539 		error = tog_log_with_path(argc, argv);
8540 	} else {
8541 		if (hflag)
8542 			cmd->cmd_usage();
8543 		else
8544 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8545 	}
8546 
8547 	endwin();
8548 	putchar('\n');
8549 	if (cmd_argv) {
8550 		int i;
8551 		for (i = 0; i < argc; i++)
8552 			free(cmd_argv[i]);
8553 		free(cmd_argv);
8554 	}
8555 
8556 	if (error && error->code != GOT_ERR_CANCELLED)
8557 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8558 	return 0;
8559 }