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 
322 struct tog_diff_view_state {
323 	struct got_object_id *id1, *id2;
324 	const char *label1, *label2;
325 	FILE *f, *f1, *f2;
326 	int fd1, fd2;
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 tog_colors colors;
335 	size_t nlines;
336 	off_t *line_offsets;
337 	int matched_line;
338 	int selected_line;
339 
340 	/* passed from log or blame view; may be NULL */
341 	struct tog_view *parent_view;
342 };
343 
344 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
345 static volatile sig_atomic_t tog_thread_error;
346 
347 struct tog_log_thread_args {
348 	pthread_cond_t need_commits;
349 	pthread_cond_t commit_loaded;
350 	int commits_needed;
351 	int load_all;
352 	struct got_commit_graph *graph;
353 	struct commit_queue *commits;
354 	const char *in_repo_path;
355 	struct got_object_id *start_id;
356 	struct got_repository *repo;
357 	int *pack_fds;
358 	int log_complete;
359 	sig_atomic_t *quit;
360 	struct commit_queue_entry **first_displayed_entry;
361 	struct commit_queue_entry **selected_entry;
362 	int *searching;
363 	int *search_next_done;
364 	regex_t *regex;
365 };
366 
367 struct tog_log_view_state {
368 	struct commit_queue commits;
369 	struct commit_queue_entry *first_displayed_entry;
370 	struct commit_queue_entry *last_displayed_entry;
371 	struct commit_queue_entry *selected_entry;
372 	int selected;
373 	char *in_repo_path;
374 	char *head_ref_name;
375 	int log_branches;
376 	struct got_repository *repo;
377 	struct got_object_id *start_id;
378 	sig_atomic_t quit;
379 	pthread_t thread;
380 	struct tog_log_thread_args thread_args;
381 	struct commit_queue_entry *matched_entry;
382 	struct commit_queue_entry *search_entry;
383 	struct tog_colors colors;
384 	int use_committer;
385 };
386 
387 #define TOG_COLOR_DIFF_MINUS		1
388 #define TOG_COLOR_DIFF_PLUS		2
389 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
390 #define TOG_COLOR_DIFF_META		4
391 #define TOG_COLOR_TREE_SUBMODULE	5
392 #define TOG_COLOR_TREE_SYMLINK		6
393 #define TOG_COLOR_TREE_DIRECTORY	7
394 #define TOG_COLOR_TREE_EXECUTABLE	8
395 #define TOG_COLOR_COMMIT		9
396 #define TOG_COLOR_AUTHOR		10
397 #define TOG_COLOR_DATE			11
398 #define TOG_COLOR_REFS_HEADS		12
399 #define TOG_COLOR_REFS_TAGS		13
400 #define TOG_COLOR_REFS_REMOTES		14
401 #define TOG_COLOR_REFS_BACKUP		15
402 
403 struct tog_blame_cb_args {
404 	struct tog_blame_line *lines; /* one per line */
405 	int nlines;
406 
407 	struct tog_view *view;
408 	struct got_object_id *commit_id;
409 	int *quit;
410 };
411 
412 struct tog_blame_thread_args {
413 	const char *path;
414 	struct got_repository *repo;
415 	struct tog_blame_cb_args *cb_args;
416 	int *complete;
417 	got_cancel_cb cancel_cb;
418 	void *cancel_arg;
419 };
420 
421 struct tog_blame {
422 	FILE *f;
423 	off_t filesize;
424 	struct tog_blame_line *lines;
425 	int nlines;
426 	off_t *line_offsets;
427 	pthread_t thread;
428 	struct tog_blame_thread_args thread_args;
429 	struct tog_blame_cb_args cb_args;
430 	const char *path;
431 	int *pack_fds;
432 };
433 
434 struct tog_blame_view_state {
435 	int first_displayed_line;
436 	int last_displayed_line;
437 	int selected_line;
438 	int last_diffed_line;
439 	int blame_complete;
440 	int eof;
441 	int done;
442 	struct got_object_id_queue blamed_commits;
443 	struct got_object_qid *blamed_commit;
444 	char *path;
445 	struct got_repository *repo;
446 	struct got_object_id *commit_id;
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 ch, count; /* current keymap and count prefix */
526 	int resized; /* set when in a resize event */
527 	int focussed; /* Only set on one parent or child view at a time. */
528 	int dying;
529 	struct tog_view *parent;
530 	struct tog_view *child;
531 
532 	/*
533 	 * This flag is initially set on parent views when a new child view
534 	 * is created. It gets toggled when the 'Tab' key switches focus
535 	 * between parent and child.
536 	 * The flag indicates whether focus should be passed on to our child
537 	 * view if this parent view gets picked for focus after another parent
538 	 * view was closed. This prevents child views from losing focus in such
539 	 * situations.
540 	 */
541 	int focus_child;
542 
543 	enum tog_view_mode mode;
544 	/* type-specific state */
545 	enum tog_view_type type;
546 	union {
547 		struct tog_diff_view_state diff;
548 		struct tog_log_view_state log;
549 		struct tog_blame_view_state blame;
550 		struct tog_tree_view_state tree;
551 		struct tog_ref_view_state ref;
552 	} state;
553 
554 	const struct got_error *(*show)(struct tog_view *);
555 	const struct got_error *(*input)(struct tog_view **,
556 	    struct tog_view *, int);
557 	const struct got_error *(*reset)(struct tog_view *);
558 	const struct got_error *(*resize)(struct tog_view *, int);
559 	const struct got_error *(*close)(struct tog_view *);
560 
561 	const struct got_error *(*search_start)(struct tog_view *);
562 	const struct got_error *(*search_next)(struct tog_view *);
563 	int search_started;
564 	int searching;
565 #define TOG_SEARCH_FORWARD	1
566 #define TOG_SEARCH_BACKWARD	2
567 	int search_next_done;
568 #define TOG_SEARCH_HAVE_MORE	1
569 #define TOG_SEARCH_NO_MORE	2
570 #define TOG_SEARCH_HAVE_NONE	3
571 	regex_t regex;
572 	regmatch_t regmatch;
573 };
574 
575 static const struct got_error *open_diff_view(struct tog_view *,
576     struct got_object_id *, struct got_object_id *,
577     const char *, const char *, int, int, int, struct tog_view *,
578     struct got_repository *);
579 static const struct got_error *show_diff_view(struct tog_view *);
580 static const struct got_error *input_diff_view(struct tog_view **,
581     struct tog_view *, int);
582 static const struct got_error *reset_diff_view(struct tog_view *);
583 static const struct got_error* close_diff_view(struct tog_view *);
584 static const struct got_error *search_start_diff_view(struct tog_view *);
585 static const struct got_error *search_next_diff_view(struct tog_view *);
586 
587 static const struct got_error *open_log_view(struct tog_view *,
588     struct got_object_id *, struct got_repository *,
589     const char *, const char *, int);
590 static const struct got_error * show_log_view(struct tog_view *);
591 static const struct got_error *input_log_view(struct tog_view **,
592     struct tog_view *, int);
593 static const struct got_error *resize_log_view(struct tog_view *, int);
594 static const struct got_error *close_log_view(struct tog_view *);
595 static const struct got_error *search_start_log_view(struct tog_view *);
596 static const struct got_error *search_next_log_view(struct tog_view *);
597 
598 static const struct got_error *open_blame_view(struct tog_view *, char *,
599     struct got_object_id *, struct got_repository *);
600 static const struct got_error *show_blame_view(struct tog_view *);
601 static const struct got_error *input_blame_view(struct tog_view **,
602     struct tog_view *, int);
603 static const struct got_error *reset_blame_view(struct tog_view *);
604 static const struct got_error *close_blame_view(struct tog_view *);
605 static const struct got_error *search_start_blame_view(struct tog_view *);
606 static const struct got_error *search_next_blame_view(struct tog_view *);
607 
608 static const struct got_error *open_tree_view(struct tog_view *,
609     struct got_object_id *, const char *, struct got_repository *);
610 static const struct got_error *show_tree_view(struct tog_view *);
611 static const struct got_error *input_tree_view(struct tog_view **,
612     struct tog_view *, int);
613 static const struct got_error *close_tree_view(struct tog_view *);
614 static const struct got_error *search_start_tree_view(struct tog_view *);
615 static const struct got_error *search_next_tree_view(struct tog_view *);
616 
617 static const struct got_error *open_ref_view(struct tog_view *,
618     struct got_repository *);
619 static const struct got_error *show_ref_view(struct tog_view *);
620 static const struct got_error *input_ref_view(struct tog_view **,
621     struct tog_view *, int);
622 static const struct got_error *close_ref_view(struct tog_view *);
623 static const struct got_error *search_start_ref_view(struct tog_view *);
624 static const struct got_error *search_next_ref_view(struct tog_view *);
625 
626 static volatile sig_atomic_t tog_sigwinch_received;
627 static volatile sig_atomic_t tog_sigpipe_received;
628 static volatile sig_atomic_t tog_sigcont_received;
629 static volatile sig_atomic_t tog_sigint_received;
630 static volatile sig_atomic_t tog_sigterm_received;
631 
632 static void
633 tog_sigwinch(int signo)
634 {
635 	tog_sigwinch_received = 1;
636 }
637 
638 static void
639 tog_sigpipe(int signo)
640 {
641 	tog_sigpipe_received = 1;
642 }
643 
644 static void
645 tog_sigcont(int signo)
646 {
647 	tog_sigcont_received = 1;
648 }
649 
650 static void
651 tog_sigint(int signo)
652 {
653 	tog_sigint_received = 1;
654 }
655 
656 static void
657 tog_sigterm(int signo)
658 {
659 	tog_sigterm_received = 1;
660 }
661 
662 static int
663 tog_fatal_signal_received(void)
664 {
665 	return (tog_sigpipe_received ||
666 	    tog_sigint_received || tog_sigint_received);
667 }
668 
669 static const struct got_error *
670 view_close(struct tog_view *view)
671 {
672 	const struct got_error *err = NULL, *child_err = NULL;
673 
674 	if (view->child) {
675 		child_err = view_close(view->child);
676 		view->child = NULL;
677 	}
678 	if (view->close)
679 		err = view->close(view);
680 	if (view->panel)
681 		del_panel(view->panel);
682 	if (view->window)
683 		delwin(view->window);
684 	free(view);
685 	return err ? err : child_err;
686 }
687 
688 static struct tog_view *
689 view_open(int nlines, int ncols, int begin_y, int begin_x,
690     enum tog_view_type type)
691 {
692 	struct tog_view *view = calloc(1, sizeof(*view));
693 
694 	if (view == NULL)
695 		return NULL;
696 
697 	view->type = type;
698 	view->lines = LINES;
699 	view->cols = COLS;
700 	view->nlines = nlines ? nlines : LINES - begin_y;
701 	view->ncols = ncols ? ncols : COLS - begin_x;
702 	view->begin_y = begin_y;
703 	view->begin_x = begin_x;
704 	view->window = newwin(nlines, ncols, begin_y, begin_x);
705 	if (view->window == NULL) {
706 		view_close(view);
707 		return NULL;
708 	}
709 	view->panel = new_panel(view->window);
710 	if (view->panel == NULL ||
711 	    set_panel_userptr(view->panel, view) != OK) {
712 		view_close(view);
713 		return NULL;
714 	}
715 
716 	keypad(view->window, TRUE);
717 	return view;
718 }
719 
720 static int
721 view_split_begin_x(int begin_x)
722 {
723 	if (begin_x > 0 || COLS < 120)
724 		return 0;
725 	return (COLS - MAX(COLS / 2, 80));
726 }
727 
728 /* XXX Stub till we decide what to do. */
729 static int
730 view_split_begin_y(int lines)
731 {
732 	return lines * HSPLIT_SCALE;
733 }
734 
735 static const struct got_error *view_resize(struct tog_view *);
736 
737 static const struct got_error *
738 view_splitscreen(struct tog_view *view)
739 {
740 	const struct got_error *err = NULL;
741 
742 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
743 		if (view->resized_y && view->resized_y < view->lines)
744 			view->begin_y = view->resized_y;
745 		else
746 			view->begin_y = view_split_begin_y(view->nlines);
747 		view->begin_x = 0;
748 	} else if (!view->resized) {
749 		if (view->resized_x && view->resized_x < view->cols - 1 &&
750 		    view->cols > 119)
751 			view->begin_x = view->resized_x;
752 		else
753 			view->begin_x = view_split_begin_x(0);
754 		view->begin_y = 0;
755 	}
756 	view->nlines = LINES - view->begin_y;
757 	view->ncols = COLS - view->begin_x;
758 	view->lines = LINES;
759 	view->cols = COLS;
760 	err = view_resize(view);
761 	if (err)
762 		return err;
763 
764 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
765 		view->parent->nlines = view->begin_y;
766 
767 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
768 		return got_error_from_errno("mvwin");
769 
770 	return NULL;
771 }
772 
773 static const struct got_error *
774 view_fullscreen(struct tog_view *view)
775 {
776 	const struct got_error *err = NULL;
777 
778 	view->begin_x = 0;
779 	view->begin_y = view->resized ? view->begin_y : 0;
780 	view->nlines = view->resized ? view->nlines : LINES;
781 	view->ncols = COLS;
782 	view->lines = LINES;
783 	view->cols = COLS;
784 	err = view_resize(view);
785 	if (err)
786 		return err;
787 
788 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
789 		return got_error_from_errno("mvwin");
790 
791 	return NULL;
792 }
793 
794 static int
795 view_is_parent_view(struct tog_view *view)
796 {
797 	return view->parent == NULL;
798 }
799 
800 static int
801 view_is_splitscreen(struct tog_view *view)
802 {
803 	return view->begin_x > 0 || view->begin_y > 0;
804 }
805 
806 static int
807 view_is_fullscreen(struct tog_view *view)
808 {
809 	return view->nlines == LINES && view->ncols == COLS;
810 }
811 
812 static int
813 view_is_hsplit_top(struct tog_view *view)
814 {
815 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
816 	    view_is_splitscreen(view->child);
817 }
818 
819 static void
820 view_border(struct tog_view *view)
821 {
822 	PANEL *panel;
823 	const struct tog_view *view_above;
824 
825 	if (view->parent)
826 		return view_border(view->parent);
827 
828 	panel = panel_above(view->panel);
829 	if (panel == NULL)
830 		return;
831 
832 	view_above = panel_userptr(panel);
833 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
834 		mvwhline(view->window, view_above->begin_y - 1,
835 		    view->begin_x, got_locale_is_utf8() ?
836 		    ACS_HLINE : '-', view->ncols);
837 	else
838 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
839 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
840 }
841 
842 static const struct got_error *view_init_hsplit(struct tog_view *, int);
843 static const struct got_error *request_log_commits(struct tog_view *);
844 static const struct got_error *offset_selection_down(struct tog_view *);
845 static void offset_selection_up(struct tog_view *);
846 static void view_get_split(struct tog_view *, int *, int *);
847 
848 static const struct got_error *
849 view_resize(struct tog_view *view)
850 {
851 	const struct got_error	*err = NULL;
852 	int			 dif, nlines, ncols;
853 
854 	dif = LINES - view->lines;  /* line difference */
855 
856 	if (view->lines > LINES)
857 		nlines = view->nlines - (view->lines - LINES);
858 	else
859 		nlines = view->nlines + (LINES - view->lines);
860 	if (view->cols > COLS)
861 		ncols = view->ncols - (view->cols - COLS);
862 	else
863 		ncols = view->ncols + (COLS - view->cols);
864 
865 	if (view->child) {
866 		int hs = view->child->begin_y;
867 
868 		if (!view_is_fullscreen(view))
869 			view->child->begin_x = view_split_begin_x(view->begin_x);
870 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
871 		    view->child->begin_x == 0) {
872 			ncols = COLS;
873 
874 			view_fullscreen(view->child);
875 			if (view->child->focussed)
876 				show_panel(view->child->panel);
877 			else
878 				show_panel(view->panel);
879 		} else {
880 			ncols = view->child->begin_x;
881 
882 			view_splitscreen(view->child);
883 			show_panel(view->child->panel);
884 		}
885 		/*
886 		 * XXX This is ugly and needs to be moved into the above
887 		 * logic but "works" for now and my attempts at moving it
888 		 * break either 'tab' or 'F' key maps in horizontal splits.
889 		 */
890 		if (hs) {
891 			err = view_splitscreen(view->child);
892 			if (err)
893 				return err;
894 			if (dif < 0) { /* top split decreased */
895 				err = offset_selection_down(view);
896 				if (err)
897 					return err;
898 			}
899 			view_border(view);
900 			update_panels();
901 			doupdate();
902 			show_panel(view->child->panel);
903 			nlines = view->nlines;
904 		}
905 	} else if (view->parent == NULL)
906 		ncols = COLS;
907 
908 	if (view->resize && dif > 0) {
909 		err = view->resize(view, dif);
910 		if (err)
911 			return err;
912 	}
913 
914 	if (wresize(view->window, nlines, ncols) == ERR)
915 		return got_error_from_errno("wresize");
916 	if (replace_panel(view->panel, view->window) == ERR)
917 		return got_error_from_errno("replace_panel");
918 	wclear(view->window);
919 
920 	view->nlines = nlines;
921 	view->ncols = ncols;
922 	view->lines = LINES;
923 	view->cols = COLS;
924 
925 	return NULL;
926 }
927 
928 static const struct got_error *
929 resize_log_view(struct tog_view *view, int increase)
930 {
931 	struct tog_log_view_state *s = &view->state.log;
932 	const struct got_error *err = NULL;
933 	int n = s->selected_entry->idx + view->lines - s->selected;
934 
935 	/*
936 	 * Request commits to account for the increased
937 	 * height so we have enough to populate the view.
938 	 */
939 	if (s->commits.ncommits < n) {
940 		view->nscrolled = n - s->commits.ncommits + increase + 1;
941 		err = request_log_commits(view);
942 	}
943 
944 	return err;
945 }
946 
947 static void
948 view_adjust_offset(struct tog_view *view, int n)
949 {
950 	if (n == 0)
951 		return;
952 
953 	if (view->parent && view->parent->offset) {
954 		if (view->parent->offset + n >= 0)
955 			view->parent->offset += n;
956 		else
957 			view->parent->offset = 0;
958 	} else if (view->offset) {
959 		if (view->offset - n >= 0)
960 			view->offset -= n;
961 		else
962 			view->offset = 0;
963 	}
964 }
965 
966 static const struct got_error *
967 view_resize_split(struct tog_view *view, int resize)
968 {
969 	const struct got_error	*err = NULL;
970 	struct tog_view		*v = NULL;
971 
972 	if (view->parent)
973 		v = view->parent;
974 	else
975 		v = view;
976 
977 	if (!v->child || !view_is_splitscreen(v->child))
978 		return NULL;
979 
980 	v->resized = v->child->resized = resize;  /* lock for resize event */
981 
982 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
983 		int y = v->child->begin_y;
984 
985 		if (v->child->resized_y)
986 			v->child->begin_y = v->child->resized_y;
987 		if (view->parent)
988 			v->child->begin_y -= resize;
989 		else
990 			v->child->begin_y += resize;
991 		if (v->child->begin_y < 3) {
992 			view->count = 0;
993 			v->child->begin_y = 3;
994 		} else if (v->child->begin_y > LINES - 1) {
995 			view->count = 0;
996 			v->child->begin_y = LINES - 1;
997 		}
998 		v->ncols = COLS;
999 		v->child->ncols = COLS;
1000 		view_adjust_offset(view, resize);
1001 		err = view_init_hsplit(v, v->child->begin_y);
1002 		if (err)
1003 			return err;
1004 		v->child->resized_y = v->child->begin_y;
1005 		if (y > v->child->begin_y && v->child->type == TOG_VIEW_LOG)
1006 			v->child->nscrolled = y - v->child->begin_y;
1007 		else if (y < v->child->begin_y && v->type == TOG_VIEW_LOG)
1008 			v->nscrolled = v->child->begin_y - y;
1009 	} else {
1010 		if (v->child->resized_x)
1011 			v->child->begin_x = v->child->resized_x;
1012 		if (view->parent)
1013 			v->child->begin_x -= resize;
1014 		else
1015 			v->child->begin_x += resize;
1016 		if (v->child->begin_x < 11) {
1017 			view->count = 0;
1018 			v->child->begin_x = 11;
1019 		} else if (v->child->begin_x > COLS - 1) {
1020 			view->count = 0;
1021 			v->child->begin_x = COLS - 1;
1022 		}
1023 		v->child->resized_x = v->child->begin_x;
1024 	}
1025 
1026 	v->child->mode = v->mode;
1027 	v->child->nlines = v->lines - v->child->begin_y;
1028 	v->child->ncols = v->cols - v->child->begin_x;
1029 	v->focus_child = 1;
1030 
1031 	err = view_fullscreen(v);
1032 	if (err)
1033 		return err;
1034 	err = view_splitscreen(v->child);
1035 	if (err)
1036 		return err;
1037 
1038 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1039 		err = offset_selection_down(v->child);
1040 		if (err)
1041 			return err;
1042 	}
1043 
1044 	if (v->nscrolled)
1045 		err = request_log_commits(v);
1046 	else if (v->child->nscrolled)
1047 		err = request_log_commits(v->child);
1048 
1049 	v->resized = v->child->resized = 0;
1050 
1051 	return err;
1052 }
1053 
1054 static void
1055 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1056 {
1057 	struct tog_view *v = src->child ? src->child : src;
1058 
1059 	dst->resized_x = v->resized_x;
1060 	dst->resized_y = v->resized_y;
1061 }
1062 
1063 static const struct got_error *
1064 view_close_child(struct tog_view *view)
1065 {
1066 	const struct got_error *err = NULL;
1067 
1068 	if (view->child == NULL)
1069 		return NULL;
1070 
1071 	err = view_close(view->child);
1072 	view->child = NULL;
1073 	return err;
1074 }
1075 
1076 static const struct got_error *
1077 view_set_child(struct tog_view *view, struct tog_view *child)
1078 {
1079 	const struct got_error *err = NULL;
1080 
1081 	view->child = child;
1082 	child->parent = view;
1083 
1084 	err = view_resize(view);
1085 	if (err)
1086 		return err;
1087 
1088 	if (view->child->resized_x || view->child->resized_y)
1089 		err = view_resize_split(view, 0);
1090 
1091 	return err;
1092 }
1093 
1094 static void
1095 tog_resizeterm(void)
1096 {
1097 	int cols, lines;
1098 	struct winsize size;
1099 
1100 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1101 		cols = 80;     /* Default */
1102 		lines = 24;
1103 	} else {
1104 		cols = size.ws_col;
1105 		lines = size.ws_row;
1106 	}
1107 	resize_term(lines, cols);
1108 }
1109 
1110 static const struct got_error *
1111 view_search_start(struct tog_view *view)
1112 {
1113 	const struct got_error *err = NULL;
1114 	struct tog_view *v = view;
1115 	char pattern[1024];
1116 	int ret;
1117 
1118 	if (view->search_started) {
1119 		regfree(&view->regex);
1120 		view->searching = 0;
1121 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1122 	}
1123 	view->search_started = 0;
1124 
1125 	if (view->nlines < 1)
1126 		return NULL;
1127 
1128 	if (view_is_hsplit_top(view))
1129 		v = view->child;
1130 
1131 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1132 	wclrtoeol(v->window);
1133 
1134 	nodelay(view->window, FALSE);  /* block for search term input */
1135 	nocbreak();
1136 	echo();
1137 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1138 	wrefresh(v->window);
1139 	cbreak();
1140 	noecho();
1141 	nodelay(view->window, TRUE);
1142 	if (ret == ERR)
1143 		return NULL;
1144 
1145 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1146 		err = view->search_start(view);
1147 		if (err) {
1148 			regfree(&view->regex);
1149 			return err;
1150 		}
1151 		view->search_started = 1;
1152 		view->searching = TOG_SEARCH_FORWARD;
1153 		view->search_next_done = 0;
1154 		view->search_next(view);
1155 	}
1156 
1157 	return NULL;
1158 }
1159 
1160 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1161 static const struct got_error *
1162 switch_split(struct tog_view *view)
1163 {
1164 	const struct got_error	*err = NULL;
1165 	struct tog_view		*v = NULL;
1166 
1167 	if (view->parent)
1168 		v = view->parent;
1169 	else
1170 		v = view;
1171 
1172 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1173 		v->mode = TOG_VIEW_SPLIT_VERT;
1174 	else
1175 		v->mode = TOG_VIEW_SPLIT_HRZN;
1176 
1177 	if (!v->child)
1178 		return NULL;
1179 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1180 		v->mode = TOG_VIEW_SPLIT_NONE;
1181 
1182 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1183 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1184 		v->child->begin_y = v->child->resized_y;
1185 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1186 		v->child->begin_x = v->child->resized_x;
1187 
1188 
1189 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1190 		v->ncols = COLS;
1191 		v->child->ncols = COLS;
1192 		v->child->nscrolled = LINES - v->child->nlines;
1193 
1194 		err = view_init_hsplit(v, v->child->begin_y);
1195 		if (err)
1196 			return err;
1197 	}
1198 	v->child->mode = v->mode;
1199 	v->child->nlines = v->lines - v->child->begin_y;
1200 	v->focus_child = 1;
1201 
1202 	err = view_fullscreen(v);
1203 	if (err)
1204 		return err;
1205 	err = view_splitscreen(v->child);
1206 	if (err)
1207 		return err;
1208 
1209 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1210 		v->mode = TOG_VIEW_SPLIT_VERT;
1211 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1212 		err = offset_selection_down(v);
1213 		err = offset_selection_down(v->child);
1214 	} else {
1215 		offset_selection_up(v);
1216 		offset_selection_up(v->child);
1217 	}
1218 	if (v->type == TOG_VIEW_LOG && v->nscrolled)
1219 		err = request_log_commits(v);
1220 	else if (v->child->type == TOG_VIEW_LOG && v->child->nscrolled)
1221 		err = request_log_commits(v->child);
1222 
1223 	return err;
1224 }
1225 
1226 /*
1227  * Compute view->count from numeric input. Assign total to view->count and
1228  * return first non-numeric key entered.
1229  */
1230 static int
1231 get_compound_key(struct tog_view *view, int c)
1232 {
1233 	struct tog_view	*v = view;
1234 	int		 x, n = 0;
1235 
1236 	if (view_is_hsplit_top(view))
1237 		v = view->child;
1238 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1239 		v = view->parent;
1240 
1241 	view->count = 0;
1242 	cbreak();  /* block for input */
1243 	wmove(v->window, v->nlines - 1, 0);
1244 	wclrtoeol(v->window);
1245 	waddch(v->window, ':');
1246 
1247 	do {
1248 		x = getcurx(v->window);
1249 		if (x != ERR && x < view->ncols) {
1250 			waddch(v->window, c);
1251 			wrefresh(v->window);
1252 		}
1253 
1254 		/*
1255 		 * Don't overflow. Max valid request should be the greatest
1256 		 * between the longest and total lines; cap at 10 million.
1257 		 */
1258 		if (n >= 9999999)
1259 			n = 9999999;
1260 		else
1261 			n = n * 10 + (c - '0');
1262 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1263 
1264 	/* Massage excessive or inapplicable values at the input handler. */
1265 	view->count = n;
1266 
1267 	return c;
1268 }
1269 
1270 static const struct got_error *
1271 view_input(struct tog_view **new, int *done, struct tog_view *view,
1272     struct tog_view_list_head *views)
1273 {
1274 	const struct got_error *err = NULL;
1275 	struct tog_view *v;
1276 	int ch, errcode;
1277 
1278 	*new = NULL;
1279 
1280 	/* Clear "no matches" indicator. */
1281 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1282 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1283 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1284 		view->count = 0;
1285 	}
1286 
1287 	if (view->searching && !view->search_next_done) {
1288 		errcode = pthread_mutex_unlock(&tog_mutex);
1289 		if (errcode)
1290 			return got_error_set_errno(errcode,
1291 			    "pthread_mutex_unlock");
1292 		sched_yield();
1293 		errcode = pthread_mutex_lock(&tog_mutex);
1294 		if (errcode)
1295 			return got_error_set_errno(errcode,
1296 			    "pthread_mutex_lock");
1297 		view->search_next(view);
1298 		return NULL;
1299 	}
1300 
1301 	nodelay(view->window, FALSE);
1302 	/* Allow threads to make progress while we are waiting for input. */
1303 	errcode = pthread_mutex_unlock(&tog_mutex);
1304 	if (errcode)
1305 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1306 	/* If we have an unfinished count, let C-g or backspace abort. */
1307 	if (view->count && --view->count) {
1308 		cbreak();
1309 		nodelay(view->window, TRUE);
1310 		ch = wgetch(view->window);
1311 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1312 			view->count = 0;
1313 		else
1314 			ch = view->ch;
1315 	} else {
1316 		ch = wgetch(view->window);
1317 		if (ch >= '1' && ch  <= '9')
1318 			view->ch = ch = get_compound_key(view, ch);
1319 	}
1320 	errcode = pthread_mutex_lock(&tog_mutex);
1321 	if (errcode)
1322 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1323 	nodelay(view->window, TRUE);
1324 
1325 	if (tog_sigwinch_received || tog_sigcont_received) {
1326 		tog_resizeterm();
1327 		tog_sigwinch_received = 0;
1328 		tog_sigcont_received = 0;
1329 		TAILQ_FOREACH(v, views, entry) {
1330 			err = view_resize(v);
1331 			if (err)
1332 				return err;
1333 			err = v->input(new, v, KEY_RESIZE);
1334 			if (err)
1335 				return err;
1336 			if (v->child) {
1337 				err = view_resize(v->child);
1338 				if (err)
1339 					return err;
1340 				err = v->child->input(new, v->child,
1341 				    KEY_RESIZE);
1342 				if (err)
1343 					return err;
1344 				if (v->child->resized_x || v->child->resized_y) {
1345 					err = view_resize_split(v, 0);
1346 					if (err)
1347 						return err;
1348 				}
1349 			}
1350 		}
1351 	}
1352 
1353 	switch (ch) {
1354 	case '\t':
1355 		view->count = 0;
1356 		if (view->child) {
1357 			view->focussed = 0;
1358 			view->child->focussed = 1;
1359 			view->focus_child = 1;
1360 		} else if (view->parent) {
1361 			view->focussed = 0;
1362 			view->parent->focussed = 1;
1363 			view->parent->focus_child = 0;
1364 			if (!view_is_splitscreen(view)) {
1365 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1366 				    view->parent->type == TOG_VIEW_LOG) {
1367 					err = request_log_commits(view->parent);
1368 					if (err)
1369 						return err;
1370 				}
1371 				offset_selection_up(view->parent);
1372 				err = view_fullscreen(view->parent);
1373 				if (err)
1374 					return err;
1375 			}
1376 		}
1377 		break;
1378 	case 'q':
1379 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1380 			if (view->parent->type == TOG_VIEW_LOG) {
1381 				/* might need more commits to fill fullscreen */
1382 				err = request_log_commits(view->parent);
1383 				if (err)
1384 					break;
1385 			}
1386 			offset_selection_up(view->parent);
1387 		}
1388 		err = view->input(new, view, ch);
1389 		view->dying = 1;
1390 		break;
1391 	case 'Q':
1392 		*done = 1;
1393 		break;
1394 	case 'F':
1395 		view->count = 0;
1396 		if (view_is_parent_view(view)) {
1397 			if (view->child == NULL)
1398 				break;
1399 			if (view_is_splitscreen(view->child)) {
1400 				view->focussed = 0;
1401 				view->child->focussed = 1;
1402 				err = view_fullscreen(view->child);
1403 			} else {
1404 				err = view_splitscreen(view->child);
1405 				if (!err)
1406 					err = view_resize_split(view, 0);
1407 			}
1408 			if (err)
1409 				break;
1410 			err = view->child->input(new, view->child,
1411 			    KEY_RESIZE);
1412 		} else {
1413 			if (view_is_splitscreen(view)) {
1414 				view->parent->focussed = 0;
1415 				view->focussed = 1;
1416 				err = view_fullscreen(view);
1417 			} else {
1418 				err = view_splitscreen(view);
1419 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1420 					err = view_resize(view->parent);
1421 				if (!err)
1422 					err = view_resize_split(view, 0);
1423 			}
1424 			if (err)
1425 				break;
1426 			err = view->input(new, view, KEY_RESIZE);
1427 		}
1428 		if (err)
1429 			break;
1430 		if (view->type == TOG_VIEW_LOG) {
1431 			err = request_log_commits(view);
1432 			if (err)
1433 				break;
1434 		}
1435 		if (view->parent)
1436 			err = offset_selection_down(view->parent);
1437 		if (!err)
1438 			err = offset_selection_down(view);
1439 		break;
1440 	case 'S':
1441 		view->count = 0;
1442 		err = switch_split(view);
1443 		break;
1444 	case '-':
1445 		err = view_resize_split(view, -1);
1446 		break;
1447 	case '+':
1448 		err = view_resize_split(view, 1);
1449 		break;
1450 	case KEY_RESIZE:
1451 		break;
1452 	case '/':
1453 		view->count = 0;
1454 		if (view->search_start)
1455 			view_search_start(view);
1456 		else
1457 			err = view->input(new, view, ch);
1458 		break;
1459 	case 'N':
1460 	case 'n':
1461 		if (view->search_started && view->search_next) {
1462 			view->searching = (ch == 'n' ?
1463 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1464 			view->search_next_done = 0;
1465 			view->search_next(view);
1466 		} else
1467 			err = view->input(new, view, ch);
1468 		break;
1469 	case 'A':
1470 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1471 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1472 		else
1473 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1474 		TAILQ_FOREACH(v, views, entry) {
1475 			if (v->reset) {
1476 				err = v->reset(v);
1477 				if (err)
1478 					return err;
1479 			}
1480 			if (v->child && v->child->reset) {
1481 				err = v->child->reset(v->child);
1482 				if (err)
1483 					return err;
1484 			}
1485 		}
1486 		break;
1487 	default:
1488 		err = view->input(new, view, ch);
1489 		break;
1490 	}
1491 
1492 	return err;
1493 }
1494 
1495 static int
1496 view_needs_focus_indication(struct tog_view *view)
1497 {
1498 	if (view_is_parent_view(view)) {
1499 		if (view->child == NULL || view->child->focussed)
1500 			return 0;
1501 		if (!view_is_splitscreen(view->child))
1502 			return 0;
1503 	} else if (!view_is_splitscreen(view))
1504 		return 0;
1505 
1506 	return view->focussed;
1507 }
1508 
1509 static const struct got_error *
1510 view_loop(struct tog_view *view)
1511 {
1512 	const struct got_error *err = NULL;
1513 	struct tog_view_list_head views;
1514 	struct tog_view *new_view;
1515 	char *mode;
1516 	int fast_refresh = 10;
1517 	int done = 0, errcode;
1518 
1519 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1520 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1521 		view->mode = TOG_VIEW_SPLIT_VERT;
1522 	else
1523 		view->mode = TOG_VIEW_SPLIT_HRZN;
1524 
1525 	errcode = pthread_mutex_lock(&tog_mutex);
1526 	if (errcode)
1527 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1528 
1529 	TAILQ_INIT(&views);
1530 	TAILQ_INSERT_HEAD(&views, view, entry);
1531 
1532 	view->focussed = 1;
1533 	err = view->show(view);
1534 	if (err)
1535 		return err;
1536 	update_panels();
1537 	doupdate();
1538 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1539 	    !tog_fatal_signal_received()) {
1540 		/* Refresh fast during initialization, then become slower. */
1541 		if (fast_refresh && fast_refresh-- == 0)
1542 			halfdelay(10); /* switch to once per second */
1543 
1544 		err = view_input(&new_view, &done, view, &views);
1545 		if (err)
1546 			break;
1547 		if (view->dying) {
1548 			struct tog_view *v, *prev = NULL;
1549 
1550 			if (view_is_parent_view(view))
1551 				prev = TAILQ_PREV(view, tog_view_list_head,
1552 				    entry);
1553 			else if (view->parent)
1554 				prev = view->parent;
1555 
1556 			if (view->parent) {
1557 				view->parent->child = NULL;
1558 				view->parent->focus_child = 0;
1559 				/* Restore fullscreen line height. */
1560 				view->parent->nlines = view->parent->lines;
1561 				err = view_resize(view->parent);
1562 				if (err)
1563 					break;
1564 				/* Make resized splits persist. */
1565 				view_transfer_size(view->parent, view);
1566 			} else
1567 				TAILQ_REMOVE(&views, view, entry);
1568 
1569 			err = view_close(view);
1570 			if (err)
1571 				goto done;
1572 
1573 			view = NULL;
1574 			TAILQ_FOREACH(v, &views, entry) {
1575 				if (v->focussed)
1576 					break;
1577 			}
1578 			if (view == NULL && new_view == NULL) {
1579 				/* No view has focus. Try to pick one. */
1580 				if (prev)
1581 					view = prev;
1582 				else if (!TAILQ_EMPTY(&views)) {
1583 					view = TAILQ_LAST(&views,
1584 					    tog_view_list_head);
1585 				}
1586 				if (view) {
1587 					if (view->focus_child) {
1588 						view->child->focussed = 1;
1589 						view = view->child;
1590 					} else
1591 						view->focussed = 1;
1592 				}
1593 			}
1594 		}
1595 		if (new_view) {
1596 			struct tog_view *v, *t;
1597 			/* Only allow one parent view per type. */
1598 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1599 				if (v->type != new_view->type)
1600 					continue;
1601 				TAILQ_REMOVE(&views, v, entry);
1602 				err = view_close(v);
1603 				if (err)
1604 					goto done;
1605 				break;
1606 			}
1607 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1608 			view = new_view;
1609 		}
1610 		if (view) {
1611 			if (view_is_parent_view(view)) {
1612 				if (view->child && view->child->focussed)
1613 					view = view->child;
1614 			} else {
1615 				if (view->parent && view->parent->focussed)
1616 					view = view->parent;
1617 			}
1618 			show_panel(view->panel);
1619 			if (view->child && view_is_splitscreen(view->child))
1620 				show_panel(view->child->panel);
1621 			if (view->parent && view_is_splitscreen(view)) {
1622 				err = view->parent->show(view->parent);
1623 				if (err)
1624 					goto done;
1625 			}
1626 			err = view->show(view);
1627 			if (err)
1628 				goto done;
1629 			if (view->child) {
1630 				err = view->child->show(view->child);
1631 				if (err)
1632 					goto done;
1633 			}
1634 			update_panels();
1635 			doupdate();
1636 		}
1637 	}
1638 done:
1639 	while (!TAILQ_EMPTY(&views)) {
1640 		const struct got_error *close_err;
1641 		view = TAILQ_FIRST(&views);
1642 		TAILQ_REMOVE(&views, view, entry);
1643 		close_err = view_close(view);
1644 		if (close_err && err == NULL)
1645 			err = close_err;
1646 	}
1647 
1648 	errcode = pthread_mutex_unlock(&tog_mutex);
1649 	if (errcode && err == NULL)
1650 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1651 
1652 	return err;
1653 }
1654 
1655 __dead static void
1656 usage_log(void)
1657 {
1658 	endwin();
1659 	fprintf(stderr,
1660 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1661 	    getprogname());
1662 	exit(1);
1663 }
1664 
1665 /* Create newly allocated wide-character string equivalent to a byte string. */
1666 static const struct got_error *
1667 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1668 {
1669 	char *vis = NULL;
1670 	const struct got_error *err = NULL;
1671 
1672 	*ws = NULL;
1673 	*wlen = mbstowcs(NULL, s, 0);
1674 	if (*wlen == (size_t)-1) {
1675 		int vislen;
1676 		if (errno != EILSEQ)
1677 			return got_error_from_errno("mbstowcs");
1678 
1679 		/* byte string invalid in current encoding; try to "fix" it */
1680 		err = got_mbsavis(&vis, &vislen, s);
1681 		if (err)
1682 			return err;
1683 		*wlen = mbstowcs(NULL, vis, 0);
1684 		if (*wlen == (size_t)-1) {
1685 			err = got_error_from_errno("mbstowcs"); /* give up */
1686 			goto done;
1687 		}
1688 	}
1689 
1690 	*ws = calloc(*wlen + 1, sizeof(**ws));
1691 	if (*ws == NULL) {
1692 		err = got_error_from_errno("calloc");
1693 		goto done;
1694 	}
1695 
1696 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1697 		err = got_error_from_errno("mbstowcs");
1698 done:
1699 	free(vis);
1700 	if (err) {
1701 		free(*ws);
1702 		*ws = NULL;
1703 		*wlen = 0;
1704 	}
1705 	return err;
1706 }
1707 
1708 static const struct got_error *
1709 expand_tab(char **ptr, const char *src)
1710 {
1711 	char	*dst;
1712 	size_t	 len, n, idx = 0, sz = 0;
1713 
1714 	*ptr = NULL;
1715 	n = len = strlen(src);
1716 	dst = malloc(n + 1);
1717 	if (dst == NULL)
1718 		return got_error_from_errno("malloc");
1719 
1720 	while (idx < len && src[idx]) {
1721 		const char c = src[idx];
1722 
1723 		if (c == '\t') {
1724 			size_t nb = TABSIZE - sz % TABSIZE;
1725 			char *p;
1726 
1727 			p = realloc(dst, n + nb);
1728 			if (p == NULL) {
1729 				free(dst);
1730 				return got_error_from_errno("realloc");
1731 
1732 			}
1733 			dst = p;
1734 			n += nb;
1735 			memset(dst + sz, ' ', nb);
1736 			sz += nb;
1737 		} else
1738 			dst[sz++] = src[idx];
1739 		++idx;
1740 	}
1741 
1742 	dst[sz] = '\0';
1743 	*ptr = dst;
1744 	return NULL;
1745 }
1746 
1747 /*
1748  * Advance at most n columns from wline starting at offset off.
1749  * Return the index to the first character after the span operation.
1750  * Return the combined column width of all spanned wide character in
1751  * *rcol.
1752  */
1753 static int
1754 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1755 {
1756 	int width, i, cols = 0;
1757 
1758 	if (n == 0) {
1759 		*rcol = cols;
1760 		return off;
1761 	}
1762 
1763 	for (i = off; wline[i] != L'\0'; ++i) {
1764 		if (wline[i] == L'\t')
1765 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1766 		else
1767 			width = wcwidth(wline[i]);
1768 
1769 		if (width == -1) {
1770 			width = 1;
1771 			wline[i] = L'.';
1772 		}
1773 
1774 		if (cols + width > n)
1775 			break;
1776 		cols += width;
1777 	}
1778 
1779 	*rcol = cols;
1780 	return i;
1781 }
1782 
1783 /*
1784  * Format a line for display, ensuring that it won't overflow a width limit.
1785  * With scrolling, the width returned refers to the scrolled version of the
1786  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1787  */
1788 static const struct got_error *
1789 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1790     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1791 {
1792 	const struct got_error *err = NULL;
1793 	int cols;
1794 	wchar_t *wline = NULL;
1795 	char *exstr = NULL;
1796 	size_t wlen;
1797 	int i, scrollx;
1798 
1799 	*wlinep = NULL;
1800 	*widthp = 0;
1801 
1802 	if (expand) {
1803 		err = expand_tab(&exstr, line);
1804 		if (err)
1805 			return err;
1806 	}
1807 
1808 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1809 	free(exstr);
1810 	if (err)
1811 		return err;
1812 
1813 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1814 
1815 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1816 		wline[wlen - 1] = L'\0';
1817 		wlen--;
1818 	}
1819 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1820 		wline[wlen - 1] = L'\0';
1821 		wlen--;
1822 	}
1823 
1824 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1825 	wline[i] = L'\0';
1826 
1827 	if (widthp)
1828 		*widthp = cols;
1829 	if (scrollxp)
1830 		*scrollxp = scrollx;
1831 	if (err)
1832 		free(wline);
1833 	else
1834 		*wlinep = wline;
1835 	return err;
1836 }
1837 
1838 static const struct got_error*
1839 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1840     struct got_object_id *id, struct got_repository *repo)
1841 {
1842 	static const struct got_error *err = NULL;
1843 	struct got_reflist_entry *re;
1844 	char *s;
1845 	const char *name;
1846 
1847 	*refs_str = NULL;
1848 
1849 	TAILQ_FOREACH(re, refs, entry) {
1850 		struct got_tag_object *tag = NULL;
1851 		struct got_object_id *ref_id;
1852 		int cmp;
1853 
1854 		name = got_ref_get_name(re->ref);
1855 		if (strcmp(name, GOT_REF_HEAD) == 0)
1856 			continue;
1857 		if (strncmp(name, "refs/", 5) == 0)
1858 			name += 5;
1859 		if (strncmp(name, "got/", 4) == 0 &&
1860 		    strncmp(name, "got/backup/", 11) != 0)
1861 			continue;
1862 		if (strncmp(name, "heads/", 6) == 0)
1863 			name += 6;
1864 		if (strncmp(name, "remotes/", 8) == 0) {
1865 			name += 8;
1866 			s = strstr(name, "/" GOT_REF_HEAD);
1867 			if (s != NULL && s[strlen(s)] == '\0')
1868 				continue;
1869 		}
1870 		err = got_ref_resolve(&ref_id, repo, re->ref);
1871 		if (err)
1872 			break;
1873 		if (strncmp(name, "tags/", 5) == 0) {
1874 			err = got_object_open_as_tag(&tag, repo, ref_id);
1875 			if (err) {
1876 				if (err->code != GOT_ERR_OBJ_TYPE) {
1877 					free(ref_id);
1878 					break;
1879 				}
1880 				/* Ref points at something other than a tag. */
1881 				err = NULL;
1882 				tag = NULL;
1883 			}
1884 		}
1885 		cmp = got_object_id_cmp(tag ?
1886 		    got_object_tag_get_object_id(tag) : ref_id, id);
1887 		free(ref_id);
1888 		if (tag)
1889 			got_object_tag_close(tag);
1890 		if (cmp != 0)
1891 			continue;
1892 		s = *refs_str;
1893 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1894 		    s ? ", " : "", name) == -1) {
1895 			err = got_error_from_errno("asprintf");
1896 			free(s);
1897 			*refs_str = NULL;
1898 			break;
1899 		}
1900 		free(s);
1901 	}
1902 
1903 	return err;
1904 }
1905 
1906 static const struct got_error *
1907 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1908     int col_tab_align)
1909 {
1910 	char *smallerthan;
1911 
1912 	smallerthan = strchr(author, '<');
1913 	if (smallerthan && smallerthan[1] != '\0')
1914 		author = smallerthan + 1;
1915 	author[strcspn(author, "@>")] = '\0';
1916 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1917 	    col_tab_align, 0);
1918 }
1919 
1920 static const struct got_error *
1921 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1922     struct got_object_id *id, const size_t date_display_cols,
1923     int author_display_cols)
1924 {
1925 	struct tog_log_view_state *s = &view->state.log;
1926 	const struct got_error *err = NULL;
1927 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1928 	char *logmsg0 = NULL, *logmsg = NULL;
1929 	char *author = NULL;
1930 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1931 	int author_width, logmsg_width;
1932 	char *newline, *line = NULL;
1933 	int col, limit, scrollx;
1934 	const int avail = view->ncols;
1935 	struct tm tm;
1936 	time_t committer_time;
1937 	struct tog_color *tc;
1938 
1939 	committer_time = got_object_commit_get_committer_time(commit);
1940 	if (gmtime_r(&committer_time, &tm) == NULL)
1941 		return got_error_from_errno("gmtime_r");
1942 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1943 		return got_error(GOT_ERR_NO_SPACE);
1944 
1945 	if (avail <= date_display_cols)
1946 		limit = MIN(sizeof(datebuf) - 1, avail);
1947 	else
1948 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1949 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1950 	if (tc)
1951 		wattr_on(view->window,
1952 		    COLOR_PAIR(tc->colorpair), NULL);
1953 	waddnstr(view->window, datebuf, limit);
1954 	if (tc)
1955 		wattr_off(view->window,
1956 		    COLOR_PAIR(tc->colorpair), NULL);
1957 	col = limit;
1958 	if (col > avail)
1959 		goto done;
1960 
1961 	if (avail >= 120) {
1962 		char *id_str;
1963 		err = got_object_id_str(&id_str, id);
1964 		if (err)
1965 			goto done;
1966 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1967 		if (tc)
1968 			wattr_on(view->window,
1969 			    COLOR_PAIR(tc->colorpair), NULL);
1970 		wprintw(view->window, "%.8s ", id_str);
1971 		if (tc)
1972 			wattr_off(view->window,
1973 			    COLOR_PAIR(tc->colorpair), NULL);
1974 		free(id_str);
1975 		col += 9;
1976 		if (col > avail)
1977 			goto done;
1978 	}
1979 
1980 	if (s->use_committer)
1981 		author = strdup(got_object_commit_get_committer(commit));
1982 	else
1983 		author = strdup(got_object_commit_get_author(commit));
1984 	if (author == NULL) {
1985 		err = got_error_from_errno("strdup");
1986 		goto done;
1987 	}
1988 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1989 	if (err)
1990 		goto done;
1991 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1992 	if (tc)
1993 		wattr_on(view->window,
1994 		    COLOR_PAIR(tc->colorpair), NULL);
1995 	waddwstr(view->window, wauthor);
1996 	if (tc)
1997 		wattr_off(view->window,
1998 		    COLOR_PAIR(tc->colorpair), NULL);
1999 	col += author_width;
2000 	while (col < avail && author_width < author_display_cols + 2) {
2001 		waddch(view->window, ' ');
2002 		col++;
2003 		author_width++;
2004 	}
2005 	if (col > avail)
2006 		goto done;
2007 
2008 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2009 	if (err)
2010 		goto done;
2011 	logmsg = logmsg0;
2012 	while (*logmsg == '\n')
2013 		logmsg++;
2014 	newline = strchr(logmsg, '\n');
2015 	if (newline)
2016 		*newline = '\0';
2017 	limit = avail - col;
2018 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2019 		limit--;	/* for the border */
2020 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2021 	    limit, col, 1);
2022 	if (err)
2023 		goto done;
2024 	waddwstr(view->window, &wlogmsg[scrollx]);
2025 	col += MAX(logmsg_width, 0);
2026 	while (col < avail) {
2027 		waddch(view->window, ' ');
2028 		col++;
2029 	}
2030 done:
2031 	free(logmsg0);
2032 	free(wlogmsg);
2033 	free(author);
2034 	free(wauthor);
2035 	free(line);
2036 	return err;
2037 }
2038 
2039 static struct commit_queue_entry *
2040 alloc_commit_queue_entry(struct got_commit_object *commit,
2041     struct got_object_id *id)
2042 {
2043 	struct commit_queue_entry *entry;
2044 
2045 	entry = calloc(1, sizeof(*entry));
2046 	if (entry == NULL)
2047 		return NULL;
2048 
2049 	entry->id = id;
2050 	entry->commit = commit;
2051 	return entry;
2052 }
2053 
2054 static void
2055 pop_commit(struct commit_queue *commits)
2056 {
2057 	struct commit_queue_entry *entry;
2058 
2059 	entry = TAILQ_FIRST(&commits->head);
2060 	TAILQ_REMOVE(&commits->head, entry, entry);
2061 	got_object_commit_close(entry->commit);
2062 	commits->ncommits--;
2063 	/* Don't free entry->id! It is owned by the commit graph. */
2064 	free(entry);
2065 }
2066 
2067 static void
2068 free_commits(struct commit_queue *commits)
2069 {
2070 	while (!TAILQ_EMPTY(&commits->head))
2071 		pop_commit(commits);
2072 }
2073 
2074 static const struct got_error *
2075 match_commit(int *have_match, struct got_object_id *id,
2076     struct got_commit_object *commit, regex_t *regex)
2077 {
2078 	const struct got_error *err = NULL;
2079 	regmatch_t regmatch;
2080 	char *id_str = NULL, *logmsg = NULL;
2081 
2082 	*have_match = 0;
2083 
2084 	err = got_object_id_str(&id_str, id);
2085 	if (err)
2086 		return err;
2087 
2088 	err = got_object_commit_get_logmsg(&logmsg, commit);
2089 	if (err)
2090 		goto done;
2091 
2092 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2093 	    &regmatch, 0) == 0 ||
2094 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2095 	    &regmatch, 0) == 0 ||
2096 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2097 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2098 		*have_match = 1;
2099 done:
2100 	free(id_str);
2101 	free(logmsg);
2102 	return err;
2103 }
2104 
2105 static const struct got_error *
2106 queue_commits(struct tog_log_thread_args *a)
2107 {
2108 	const struct got_error *err = NULL;
2109 
2110 	/*
2111 	 * We keep all commits open throughout the lifetime of the log
2112 	 * view in order to avoid having to re-fetch commits from disk
2113 	 * while updating the display.
2114 	 */
2115 	do {
2116 		struct got_object_id *id;
2117 		struct got_commit_object *commit;
2118 		struct commit_queue_entry *entry;
2119 		int errcode;
2120 
2121 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2122 		    NULL, NULL);
2123 		if (err || id == NULL)
2124 			break;
2125 
2126 		err = got_object_open_as_commit(&commit, a->repo, id);
2127 		if (err)
2128 			break;
2129 		entry = alloc_commit_queue_entry(commit, id);
2130 		if (entry == NULL) {
2131 			err = got_error_from_errno("alloc_commit_queue_entry");
2132 			break;
2133 		}
2134 
2135 		errcode = pthread_mutex_lock(&tog_mutex);
2136 		if (errcode) {
2137 			err = got_error_set_errno(errcode,
2138 			    "pthread_mutex_lock");
2139 			break;
2140 		}
2141 
2142 		entry->idx = a->commits->ncommits;
2143 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2144 		a->commits->ncommits++;
2145 
2146 		if (*a->searching == TOG_SEARCH_FORWARD &&
2147 		    !*a->search_next_done) {
2148 			int have_match;
2149 			err = match_commit(&have_match, id, commit, a->regex);
2150 			if (err)
2151 				break;
2152 			if (have_match)
2153 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2154 		}
2155 
2156 		errcode = pthread_mutex_unlock(&tog_mutex);
2157 		if (errcode && err == NULL)
2158 			err = got_error_set_errno(errcode,
2159 			    "pthread_mutex_unlock");
2160 		if (err)
2161 			break;
2162 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2163 
2164 	return err;
2165 }
2166 
2167 static void
2168 select_commit(struct tog_log_view_state *s)
2169 {
2170 	struct commit_queue_entry *entry;
2171 	int ncommits = 0;
2172 
2173 	entry = s->first_displayed_entry;
2174 	while (entry) {
2175 		if (ncommits == s->selected) {
2176 			s->selected_entry = entry;
2177 			break;
2178 		}
2179 		entry = TAILQ_NEXT(entry, entry);
2180 		ncommits++;
2181 	}
2182 }
2183 
2184 static const struct got_error *
2185 draw_commits(struct tog_view *view)
2186 {
2187 	const struct got_error *err = NULL;
2188 	struct tog_log_view_state *s = &view->state.log;
2189 	struct commit_queue_entry *entry = s->selected_entry;
2190 	const int limit = view->nlines;
2191 	int width;
2192 	int ncommits, author_cols = 4;
2193 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2194 	char *refs_str = NULL;
2195 	wchar_t *wline;
2196 	struct tog_color *tc;
2197 	static const size_t date_display_cols = 12;
2198 
2199 	if (s->selected_entry &&
2200 	    !(view->searching && view->search_next_done == 0)) {
2201 		struct got_reflist_head *refs;
2202 		err = got_object_id_str(&id_str, s->selected_entry->id);
2203 		if (err)
2204 			return err;
2205 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2206 		    s->selected_entry->id);
2207 		if (refs) {
2208 			err = build_refs_str(&refs_str, refs,
2209 			    s->selected_entry->id, s->repo);
2210 			if (err)
2211 				goto done;
2212 		}
2213 	}
2214 
2215 	if (s->thread_args.commits_needed == 0)
2216 		halfdelay(10); /* disable fast refresh */
2217 
2218 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2219 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2220 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2221 		    (view->searching && !view->search_next_done) ?
2222 		    "searching..." : "loading...") == -1) {
2223 			err = got_error_from_errno("asprintf");
2224 			goto done;
2225 		}
2226 	} else {
2227 		const char *search_str = NULL;
2228 
2229 		if (view->searching) {
2230 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2231 				search_str = "no more matches";
2232 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2233 				search_str = "no matches found";
2234 			else if (!view->search_next_done)
2235 				search_str = "searching...";
2236 		}
2237 
2238 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2239 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2240 		    search_str ? search_str :
2241 		    (refs_str ? refs_str : "")) == -1) {
2242 			err = got_error_from_errno("asprintf");
2243 			goto done;
2244 		}
2245 	}
2246 
2247 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2248 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2249 		    "........................................",
2250 		    s->in_repo_path, ncommits_str) == -1) {
2251 			err = got_error_from_errno("asprintf");
2252 			header = NULL;
2253 			goto done;
2254 		}
2255 	} else if (asprintf(&header, "commit %s%s",
2256 	    id_str ? id_str : "........................................",
2257 	    ncommits_str) == -1) {
2258 		err = got_error_from_errno("asprintf");
2259 		header = NULL;
2260 		goto done;
2261 	}
2262 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2263 	if (err)
2264 		goto done;
2265 
2266 	werase(view->window);
2267 
2268 	if (view_needs_focus_indication(view))
2269 		wstandout(view->window);
2270 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2271 	if (tc)
2272 		wattr_on(view->window,
2273 		    COLOR_PAIR(tc->colorpair), NULL);
2274 	waddwstr(view->window, wline);
2275 	if (tc)
2276 		wattr_off(view->window,
2277 		    COLOR_PAIR(tc->colorpair), NULL);
2278 	while (width < view->ncols) {
2279 		waddch(view->window, ' ');
2280 		width++;
2281 	}
2282 	if (view_needs_focus_indication(view))
2283 		wstandend(view->window);
2284 	free(wline);
2285 	if (limit <= 1)
2286 		goto done;
2287 
2288 	/* Grow author column size if necessary, and set view->maxx. */
2289 	entry = s->first_displayed_entry;
2290 	ncommits = 0;
2291 	view->maxx = 0;
2292 	while (entry) {
2293 		struct got_commit_object *c = entry->commit;
2294 		char *author, *eol, *msg, *msg0;
2295 		wchar_t *wauthor, *wmsg;
2296 		int width;
2297 		if (ncommits >= limit - 1)
2298 			break;
2299 		if (s->use_committer)
2300 			author = strdup(got_object_commit_get_committer(c));
2301 		else
2302 			author = strdup(got_object_commit_get_author(c));
2303 		if (author == NULL) {
2304 			err = got_error_from_errno("strdup");
2305 			goto done;
2306 		}
2307 		err = format_author(&wauthor, &width, author, COLS,
2308 		    date_display_cols);
2309 		if (author_cols < width)
2310 			author_cols = width;
2311 		free(wauthor);
2312 		free(author);
2313 		if (err)
2314 			goto done;
2315 		err = got_object_commit_get_logmsg(&msg0, c);
2316 		if (err)
2317 			goto done;
2318 		msg = msg0;
2319 		while (*msg == '\n')
2320 			++msg;
2321 		if ((eol = strchr(msg, '\n')))
2322 			*eol = '\0';
2323 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2324 		    date_display_cols + author_cols, 0);
2325 		if (err)
2326 			goto done;
2327 		view->maxx = MAX(view->maxx, width);
2328 		free(msg0);
2329 		free(wmsg);
2330 		ncommits++;
2331 		entry = TAILQ_NEXT(entry, entry);
2332 	}
2333 
2334 	entry = s->first_displayed_entry;
2335 	s->last_displayed_entry = s->first_displayed_entry;
2336 	ncommits = 0;
2337 	while (entry) {
2338 		if (ncommits >= limit - 1)
2339 			break;
2340 		if (ncommits == s->selected)
2341 			wstandout(view->window);
2342 		err = draw_commit(view, entry->commit, entry->id,
2343 		    date_display_cols, author_cols);
2344 		if (ncommits == s->selected)
2345 			wstandend(view->window);
2346 		if (err)
2347 			goto done;
2348 		ncommits++;
2349 		s->last_displayed_entry = entry;
2350 		entry = TAILQ_NEXT(entry, entry);
2351 	}
2352 
2353 	view_border(view);
2354 done:
2355 	free(id_str);
2356 	free(refs_str);
2357 	free(ncommits_str);
2358 	free(header);
2359 	return err;
2360 }
2361 
2362 static void
2363 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2364 {
2365 	struct commit_queue_entry *entry;
2366 	int nscrolled = 0;
2367 
2368 	entry = TAILQ_FIRST(&s->commits.head);
2369 	if (s->first_displayed_entry == entry)
2370 		return;
2371 
2372 	entry = s->first_displayed_entry;
2373 	while (entry && nscrolled < maxscroll) {
2374 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2375 		if (entry) {
2376 			s->first_displayed_entry = entry;
2377 			nscrolled++;
2378 		}
2379 	}
2380 }
2381 
2382 static const struct got_error *
2383 trigger_log_thread(struct tog_view *view, int wait)
2384 {
2385 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2386 	int errcode;
2387 
2388 	halfdelay(1); /* fast refresh while loading commits */
2389 
2390 	while (!ta->log_complete && !tog_thread_error &&
2391 	    (ta->commits_needed > 0 || ta->load_all)) {
2392 		/* Wake the log thread. */
2393 		errcode = pthread_cond_signal(&ta->need_commits);
2394 		if (errcode)
2395 			return got_error_set_errno(errcode,
2396 			    "pthread_cond_signal");
2397 
2398 		/*
2399 		 * The mutex will be released while the view loop waits
2400 		 * in wgetch(), at which time the log thread will run.
2401 		 */
2402 		if (!wait)
2403 			break;
2404 
2405 		/* Display progress update in log view. */
2406 		show_log_view(view);
2407 		update_panels();
2408 		doupdate();
2409 
2410 		/* Wait right here while next commit is being loaded. */
2411 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2412 		if (errcode)
2413 			return got_error_set_errno(errcode,
2414 			    "pthread_cond_wait");
2415 
2416 		/* Display progress update in log view. */
2417 		show_log_view(view);
2418 		update_panels();
2419 		doupdate();
2420 	}
2421 
2422 	return NULL;
2423 }
2424 
2425 static const struct got_error *
2426 request_log_commits(struct tog_view *view)
2427 {
2428 	struct tog_log_view_state	*state = &view->state.log;
2429 	const struct got_error		*err = NULL;
2430 
2431 	if (state->thread_args.log_complete)
2432 		return NULL;
2433 
2434 	state->thread_args.commits_needed += view->nscrolled;
2435 	err = trigger_log_thread(view, 1);
2436 	view->nscrolled = 0;
2437 
2438 	return err;
2439 }
2440 
2441 static const struct got_error *
2442 log_scroll_down(struct tog_view *view, int maxscroll)
2443 {
2444 	struct tog_log_view_state *s = &view->state.log;
2445 	const struct got_error *err = NULL;
2446 	struct commit_queue_entry *pentry;
2447 	int nscrolled = 0, ncommits_needed;
2448 
2449 	if (s->last_displayed_entry == NULL)
2450 		return NULL;
2451 
2452 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2453 	if (s->commits.ncommits < ncommits_needed &&
2454 	    !s->thread_args.log_complete) {
2455 		/*
2456 		 * Ask the log thread for required amount of commits.
2457 		 */
2458 		s->thread_args.commits_needed += maxscroll;
2459 		err = trigger_log_thread(view, 1);
2460 		if (err)
2461 			return err;
2462 	}
2463 
2464 	do {
2465 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2466 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2467 			break;
2468 
2469 		s->last_displayed_entry = pentry ?
2470 		    pentry : s->last_displayed_entry;;
2471 
2472 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2473 		if (pentry == NULL)
2474 			break;
2475 		s->first_displayed_entry = pentry;
2476 	} while (++nscrolled < maxscroll);
2477 
2478 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2479 		view->nscrolled += nscrolled;
2480 	else
2481 		view->nscrolled = 0;
2482 
2483 	return err;
2484 }
2485 
2486 static const struct got_error *
2487 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2488     struct got_commit_object *commit, struct got_object_id *commit_id,
2489     struct tog_view *log_view, struct got_repository *repo)
2490 {
2491 	const struct got_error *err;
2492 	struct got_object_qid *parent_id;
2493 	struct tog_view *diff_view;
2494 
2495 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2496 	if (diff_view == NULL)
2497 		return got_error_from_errno("view_open");
2498 
2499 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2500 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2501 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2502 	if (err == NULL)
2503 		*new_view = diff_view;
2504 	return err;
2505 }
2506 
2507 static const struct got_error *
2508 tree_view_visit_subtree(struct tog_tree_view_state *s,
2509     struct got_tree_object *subtree)
2510 {
2511 	struct tog_parent_tree *parent;
2512 
2513 	parent = calloc(1, sizeof(*parent));
2514 	if (parent == NULL)
2515 		return got_error_from_errno("calloc");
2516 
2517 	parent->tree = s->tree;
2518 	parent->first_displayed_entry = s->first_displayed_entry;
2519 	parent->selected_entry = s->selected_entry;
2520 	parent->selected = s->selected;
2521 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2522 	s->tree = subtree;
2523 	s->selected = 0;
2524 	s->first_displayed_entry = NULL;
2525 	return NULL;
2526 }
2527 
2528 static const struct got_error *
2529 tree_view_walk_path(struct tog_tree_view_state *s,
2530     struct got_commit_object *commit, const char *path)
2531 {
2532 	const struct got_error *err = NULL;
2533 	struct got_tree_object *tree = NULL;
2534 	const char *p;
2535 	char *slash, *subpath = NULL;
2536 
2537 	/* Walk the path and open corresponding tree objects. */
2538 	p = path;
2539 	while (*p) {
2540 		struct got_tree_entry *te;
2541 		struct got_object_id *tree_id;
2542 		char *te_name;
2543 
2544 		while (p[0] == '/')
2545 			p++;
2546 
2547 		/* Ensure the correct subtree entry is selected. */
2548 		slash = strchr(p, '/');
2549 		if (slash == NULL)
2550 			te_name = strdup(p);
2551 		else
2552 			te_name = strndup(p, slash - p);
2553 		if (te_name == NULL) {
2554 			err = got_error_from_errno("strndup");
2555 			break;
2556 		}
2557 		te = got_object_tree_find_entry(s->tree, te_name);
2558 		if (te == NULL) {
2559 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2560 			free(te_name);
2561 			break;
2562 		}
2563 		free(te_name);
2564 		s->first_displayed_entry = s->selected_entry = te;
2565 
2566 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2567 			break; /* jump to this file's entry */
2568 
2569 		slash = strchr(p, '/');
2570 		if (slash)
2571 			subpath = strndup(path, slash - path);
2572 		else
2573 			subpath = strdup(path);
2574 		if (subpath == NULL) {
2575 			err = got_error_from_errno("strdup");
2576 			break;
2577 		}
2578 
2579 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2580 		    subpath);
2581 		if (err)
2582 			break;
2583 
2584 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2585 		free(tree_id);
2586 		if (err)
2587 			break;
2588 
2589 		err = tree_view_visit_subtree(s, tree);
2590 		if (err) {
2591 			got_object_tree_close(tree);
2592 			break;
2593 		}
2594 		if (slash == NULL)
2595 			break;
2596 		free(subpath);
2597 		subpath = NULL;
2598 		p = slash;
2599 	}
2600 
2601 	free(subpath);
2602 	return err;
2603 }
2604 
2605 static const struct got_error *
2606 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2607     struct commit_queue_entry *entry, const char *path,
2608     const char *head_ref_name, struct got_repository *repo)
2609 {
2610 	const struct got_error *err = NULL;
2611 	struct tog_tree_view_state *s;
2612 	struct tog_view *tree_view;
2613 
2614 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2615 	if (tree_view == NULL)
2616 		return got_error_from_errno("view_open");
2617 
2618 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2619 	if (err)
2620 		return err;
2621 	s = &tree_view->state.tree;
2622 
2623 	*new_view = tree_view;
2624 
2625 	if (got_path_is_root_dir(path))
2626 		return NULL;
2627 
2628 	return tree_view_walk_path(s, entry->commit, path);
2629 }
2630 
2631 static const struct got_error *
2632 block_signals_used_by_main_thread(void)
2633 {
2634 	sigset_t sigset;
2635 	int errcode;
2636 
2637 	if (sigemptyset(&sigset) == -1)
2638 		return got_error_from_errno("sigemptyset");
2639 
2640 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2641 	if (sigaddset(&sigset, SIGWINCH) == -1)
2642 		return got_error_from_errno("sigaddset");
2643 	if (sigaddset(&sigset, SIGCONT) == -1)
2644 		return got_error_from_errno("sigaddset");
2645 	if (sigaddset(&sigset, SIGINT) == -1)
2646 		return got_error_from_errno("sigaddset");
2647 	if (sigaddset(&sigset, SIGTERM) == -1)
2648 		return got_error_from_errno("sigaddset");
2649 
2650 	/* ncurses handles SIGTSTP */
2651 	if (sigaddset(&sigset, SIGTSTP) == -1)
2652 		return got_error_from_errno("sigaddset");
2653 
2654 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2655 	if (errcode)
2656 		return got_error_set_errno(errcode, "pthread_sigmask");
2657 
2658 	return NULL;
2659 }
2660 
2661 static void *
2662 log_thread(void *arg)
2663 {
2664 	const struct got_error *err = NULL;
2665 	int errcode = 0;
2666 	struct tog_log_thread_args *a = arg;
2667 	int done = 0;
2668 
2669 	/*
2670 	 * Sync startup with main thread such that we begin our
2671 	 * work once view_input() has released the mutex.
2672 	 */
2673 	errcode = pthread_mutex_lock(&tog_mutex);
2674 	if (errcode) {
2675 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2676 		return (void *)err;
2677 	}
2678 
2679 	err = block_signals_used_by_main_thread();
2680 	if (err) {
2681 		pthread_mutex_unlock(&tog_mutex);
2682 		goto done;
2683 	}
2684 
2685 	while (!done && !err && !tog_fatal_signal_received()) {
2686 		errcode = pthread_mutex_unlock(&tog_mutex);
2687 		if (errcode) {
2688 			err = got_error_set_errno(errcode,
2689 			    "pthread_mutex_unlock");
2690 			goto done;
2691 		}
2692 		err = queue_commits(a);
2693 		if (err) {
2694 			if (err->code != GOT_ERR_ITER_COMPLETED)
2695 				goto done;
2696 			err = NULL;
2697 			done = 1;
2698 		} else if (a->commits_needed > 0 && !a->load_all)
2699 			a->commits_needed--;
2700 
2701 		errcode = pthread_mutex_lock(&tog_mutex);
2702 		if (errcode) {
2703 			err = got_error_set_errno(errcode,
2704 			    "pthread_mutex_lock");
2705 			goto done;
2706 		} else if (*a->quit)
2707 			done = 1;
2708 		else if (*a->first_displayed_entry == NULL) {
2709 			*a->first_displayed_entry =
2710 			    TAILQ_FIRST(&a->commits->head);
2711 			*a->selected_entry = *a->first_displayed_entry;
2712 		}
2713 
2714 		errcode = pthread_cond_signal(&a->commit_loaded);
2715 		if (errcode) {
2716 			err = got_error_set_errno(errcode,
2717 			    "pthread_cond_signal");
2718 			pthread_mutex_unlock(&tog_mutex);
2719 			goto done;
2720 		}
2721 
2722 		if (done)
2723 			a->commits_needed = 0;
2724 		else {
2725 			if (a->commits_needed == 0 && !a->load_all) {
2726 				errcode = pthread_cond_wait(&a->need_commits,
2727 				    &tog_mutex);
2728 				if (errcode) {
2729 					err = got_error_set_errno(errcode,
2730 					    "pthread_cond_wait");
2731 					pthread_mutex_unlock(&tog_mutex);
2732 					goto done;
2733 				}
2734 				if (*a->quit)
2735 					done = 1;
2736 			}
2737 		}
2738 	}
2739 	a->log_complete = 1;
2740 	errcode = pthread_mutex_unlock(&tog_mutex);
2741 	if (errcode)
2742 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2743 done:
2744 	if (err) {
2745 		tog_thread_error = 1;
2746 		pthread_cond_signal(&a->commit_loaded);
2747 	}
2748 	return (void *)err;
2749 }
2750 
2751 static const struct got_error *
2752 stop_log_thread(struct tog_log_view_state *s)
2753 {
2754 	const struct got_error *err = NULL, *thread_err = NULL;
2755 	int errcode;
2756 
2757 	if (s->thread) {
2758 		s->quit = 1;
2759 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2760 		if (errcode)
2761 			return got_error_set_errno(errcode,
2762 			    "pthread_cond_signal");
2763 		errcode = pthread_mutex_unlock(&tog_mutex);
2764 		if (errcode)
2765 			return got_error_set_errno(errcode,
2766 			    "pthread_mutex_unlock");
2767 		errcode = pthread_join(s->thread, (void **)&thread_err);
2768 		if (errcode)
2769 			return got_error_set_errno(errcode, "pthread_join");
2770 		errcode = pthread_mutex_lock(&tog_mutex);
2771 		if (errcode)
2772 			return got_error_set_errno(errcode,
2773 			    "pthread_mutex_lock");
2774 		s->thread = 0; //NULL;
2775 	}
2776 
2777 	if (s->thread_args.repo) {
2778 		err = got_repo_close(s->thread_args.repo);
2779 		s->thread_args.repo = NULL;
2780 	}
2781 
2782 	if (s->thread_args.pack_fds) {
2783 		const struct got_error *pack_err =
2784 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2785 		if (err == NULL)
2786 			err = pack_err;
2787 		s->thread_args.pack_fds = NULL;
2788 	}
2789 
2790 	if (s->thread_args.graph) {
2791 		got_commit_graph_close(s->thread_args.graph);
2792 		s->thread_args.graph = NULL;
2793 	}
2794 
2795 	return err ? err : thread_err;
2796 }
2797 
2798 static const struct got_error *
2799 close_log_view(struct tog_view *view)
2800 {
2801 	const struct got_error *err = NULL;
2802 	struct tog_log_view_state *s = &view->state.log;
2803 	int errcode;
2804 
2805 	err = stop_log_thread(s);
2806 
2807 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2808 	if (errcode && err == NULL)
2809 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2810 
2811 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2812 	if (errcode && err == NULL)
2813 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2814 
2815 	free_commits(&s->commits);
2816 	free(s->in_repo_path);
2817 	s->in_repo_path = NULL;
2818 	free(s->start_id);
2819 	s->start_id = NULL;
2820 	free(s->head_ref_name);
2821 	s->head_ref_name = NULL;
2822 	return err;
2823 }
2824 
2825 static const struct got_error *
2826 search_start_log_view(struct tog_view *view)
2827 {
2828 	struct tog_log_view_state *s = &view->state.log;
2829 
2830 	s->matched_entry = NULL;
2831 	s->search_entry = NULL;
2832 	return NULL;
2833 }
2834 
2835 static const struct got_error *
2836 search_next_log_view(struct tog_view *view)
2837 {
2838 	const struct got_error *err = NULL;
2839 	struct tog_log_view_state *s = &view->state.log;
2840 	struct commit_queue_entry *entry;
2841 
2842 	/* Display progress update in log view. */
2843 	show_log_view(view);
2844 	update_panels();
2845 	doupdate();
2846 
2847 	if (s->search_entry) {
2848 		int errcode, ch;
2849 		errcode = pthread_mutex_unlock(&tog_mutex);
2850 		if (errcode)
2851 			return got_error_set_errno(errcode,
2852 			    "pthread_mutex_unlock");
2853 		ch = wgetch(view->window);
2854 		errcode = pthread_mutex_lock(&tog_mutex);
2855 		if (errcode)
2856 			return got_error_set_errno(errcode,
2857 			    "pthread_mutex_lock");
2858 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2859 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2860 			return NULL;
2861 		}
2862 		if (view->searching == TOG_SEARCH_FORWARD)
2863 			entry = TAILQ_NEXT(s->search_entry, entry);
2864 		else
2865 			entry = TAILQ_PREV(s->search_entry,
2866 			    commit_queue_head, entry);
2867 	} else if (s->matched_entry) {
2868 		int matched_idx = s->matched_entry->idx;
2869 		int selected_idx = s->selected_entry->idx;
2870 
2871 		/*
2872 		 * If the user has moved the cursor after we hit a match,
2873 		 * the position from where we should continue searching
2874 		 * might have changed.
2875 		 */
2876 		if (view->searching == TOG_SEARCH_FORWARD) {
2877 			if (matched_idx > selected_idx)
2878 				entry = TAILQ_NEXT(s->selected_entry, entry);
2879 			else
2880 				entry = TAILQ_NEXT(s->matched_entry, entry);
2881 		} else {
2882 			if (matched_idx < selected_idx)
2883 				entry = TAILQ_PREV(s->selected_entry,
2884 						commit_queue_head, entry);
2885 			else
2886 				entry = TAILQ_PREV(s->matched_entry,
2887 						commit_queue_head, entry);
2888 		}
2889 	} else {
2890 		entry = s->selected_entry;
2891 	}
2892 
2893 	while (1) {
2894 		int have_match = 0;
2895 
2896 		if (entry == NULL) {
2897 			if (s->thread_args.log_complete ||
2898 			    view->searching == TOG_SEARCH_BACKWARD) {
2899 				view->search_next_done =
2900 				    (s->matched_entry == NULL ?
2901 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2902 				s->search_entry = NULL;
2903 				return NULL;
2904 			}
2905 			/*
2906 			 * Poke the log thread for more commits and return,
2907 			 * allowing the main loop to make progress. Search
2908 			 * will resume at s->search_entry once we come back.
2909 			 */
2910 			s->thread_args.commits_needed++;
2911 			return trigger_log_thread(view, 0);
2912 		}
2913 
2914 		err = match_commit(&have_match, entry->id, entry->commit,
2915 		    &view->regex);
2916 		if (err)
2917 			break;
2918 		if (have_match) {
2919 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2920 			s->matched_entry = entry;
2921 			break;
2922 		}
2923 
2924 		s->search_entry = entry;
2925 		if (view->searching == TOG_SEARCH_FORWARD)
2926 			entry = TAILQ_NEXT(entry, entry);
2927 		else
2928 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2929 	}
2930 
2931 	if (s->matched_entry) {
2932 		int cur = s->selected_entry->idx;
2933 		while (cur < s->matched_entry->idx) {
2934 			err = input_log_view(NULL, view, KEY_DOWN);
2935 			if (err)
2936 				return err;
2937 			cur++;
2938 		}
2939 		while (cur > s->matched_entry->idx) {
2940 			err = input_log_view(NULL, view, KEY_UP);
2941 			if (err)
2942 				return err;
2943 			cur--;
2944 		}
2945 	}
2946 
2947 	s->search_entry = NULL;
2948 
2949 	return NULL;
2950 }
2951 
2952 static const struct got_error *
2953 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2954     struct got_repository *repo, const char *head_ref_name,
2955     const char *in_repo_path, int log_branches)
2956 {
2957 	const struct got_error *err = NULL;
2958 	struct tog_log_view_state *s = &view->state.log;
2959 	struct got_repository *thread_repo = NULL;
2960 	struct got_commit_graph *thread_graph = NULL;
2961 	int errcode;
2962 
2963 	if (in_repo_path != s->in_repo_path) {
2964 		free(s->in_repo_path);
2965 		s->in_repo_path = strdup(in_repo_path);
2966 		if (s->in_repo_path == NULL)
2967 			return got_error_from_errno("strdup");
2968 	}
2969 
2970 	/* The commit queue only contains commits being displayed. */
2971 	TAILQ_INIT(&s->commits.head);
2972 	s->commits.ncommits = 0;
2973 
2974 	s->repo = repo;
2975 	if (head_ref_name) {
2976 		s->head_ref_name = strdup(head_ref_name);
2977 		if (s->head_ref_name == NULL) {
2978 			err = got_error_from_errno("strdup");
2979 			goto done;
2980 		}
2981 	}
2982 	s->start_id = got_object_id_dup(start_id);
2983 	if (s->start_id == NULL) {
2984 		err = got_error_from_errno("got_object_id_dup");
2985 		goto done;
2986 	}
2987 	s->log_branches = log_branches;
2988 
2989 	STAILQ_INIT(&s->colors);
2990 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2991 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2992 		    get_color_value("TOG_COLOR_COMMIT"));
2993 		if (err)
2994 			goto done;
2995 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2996 		    get_color_value("TOG_COLOR_AUTHOR"));
2997 		if (err) {
2998 			free_colors(&s->colors);
2999 			goto done;
3000 		}
3001 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3002 		    get_color_value("TOG_COLOR_DATE"));
3003 		if (err) {
3004 			free_colors(&s->colors);
3005 			goto done;
3006 		}
3007 	}
3008 
3009 	view->show = show_log_view;
3010 	view->input = input_log_view;
3011 	view->resize = resize_log_view;
3012 	view->close = close_log_view;
3013 	view->search_start = search_start_log_view;
3014 	view->search_next = search_next_log_view;
3015 
3016 	if (s->thread_args.pack_fds == NULL) {
3017 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3018 		if (err)
3019 			goto done;
3020 	}
3021 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3022 	    s->thread_args.pack_fds);
3023 	if (err)
3024 		goto done;
3025 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3026 	    !s->log_branches);
3027 	if (err)
3028 		goto done;
3029 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3030 	    s->repo, NULL, NULL);
3031 	if (err)
3032 		goto done;
3033 
3034 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3035 	if (errcode) {
3036 		err = got_error_set_errno(errcode, "pthread_cond_init");
3037 		goto done;
3038 	}
3039 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3040 	if (errcode) {
3041 		err = got_error_set_errno(errcode, "pthread_cond_init");
3042 		goto done;
3043 	}
3044 
3045 	s->thread_args.commits_needed = view->nlines;
3046 	s->thread_args.graph = thread_graph;
3047 	s->thread_args.commits = &s->commits;
3048 	s->thread_args.in_repo_path = s->in_repo_path;
3049 	s->thread_args.start_id = s->start_id;
3050 	s->thread_args.repo = thread_repo;
3051 	s->thread_args.log_complete = 0;
3052 	s->thread_args.quit = &s->quit;
3053 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3054 	s->thread_args.selected_entry = &s->selected_entry;
3055 	s->thread_args.searching = &view->searching;
3056 	s->thread_args.search_next_done = &view->search_next_done;
3057 	s->thread_args.regex = &view->regex;
3058 done:
3059 	if (err)
3060 		close_log_view(view);
3061 	return err;
3062 }
3063 
3064 static const struct got_error *
3065 show_log_view(struct tog_view *view)
3066 {
3067 	const struct got_error *err;
3068 	struct tog_log_view_state *s = &view->state.log;
3069 
3070 	if (s->thread == 0) { //NULL) {
3071 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3072 		    &s->thread_args);
3073 		if (errcode)
3074 			return got_error_set_errno(errcode, "pthread_create");
3075 		if (s->thread_args.commits_needed > 0) {
3076 			err = trigger_log_thread(view, 1);
3077 			if (err)
3078 				return err;
3079 		}
3080 	}
3081 
3082 	return draw_commits(view);
3083 }
3084 
3085 static void
3086 log_move_cursor_up(struct tog_view *view, int page, int home)
3087 {
3088 	struct tog_log_view_state *s = &view->state.log;
3089 
3090 	if (s->selected_entry->idx == 0)
3091 		view->count = 0;
3092 	if (s->first_displayed_entry == NULL)
3093 		return;
3094 
3095 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3096 	    || home)
3097 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3098 
3099 	if (!page && !home && s->selected > 0)
3100 		--s->selected;
3101 	else
3102 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3103 
3104 	select_commit(s);
3105 	return;
3106 }
3107 
3108 static const struct got_error *
3109 log_move_cursor_down(struct tog_view *view, int page)
3110 {
3111 	struct tog_log_view_state	*s = &view->state.log;
3112 	struct commit_queue_entry	*first;
3113 	const struct got_error		*err = NULL;
3114 
3115 	first = s->first_displayed_entry;
3116 	if (first == NULL) {
3117 		view->count = 0;
3118 		return NULL;
3119 	}
3120 
3121 	if (s->thread_args.log_complete &&
3122 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3123 		return NULL;
3124 
3125 	if (!page) {
3126 		int eos = view->nlines - 2;
3127 
3128 		if (view_is_hsplit_top(view))
3129 			--eos;  /* border consumes the last line */
3130 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3131 			++s->selected;
3132 		else
3133 			err = log_scroll_down(view, 1);
3134 	} else if (s->thread_args.load_all) {
3135 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3136 			s->selected += MIN(s->last_displayed_entry->idx -
3137 			    s->selected_entry->idx, page + 1);
3138 		else
3139 			err = log_scroll_down(view, MIN(page,
3140 			    s->commits.ncommits - s->selected_entry->idx - 1));
3141 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3142 	} else {
3143 		err = log_scroll_down(view, page);
3144 		if (err)
3145 			return err;
3146 		if (first == s->first_displayed_entry && s->selected <
3147 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3148 			s->selected = MIN(s->commits.ncommits - 1, page);
3149 		}
3150 	}
3151 	if (err)
3152 		return err;
3153 
3154 	/*
3155 	 * We might necessarily overshoot in horizontal
3156 	 * splits; if so, select the last displayed commit.
3157 	 */
3158 	s->selected = MIN(s->selected,
3159 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3160 
3161 	select_commit(s);
3162 
3163 	if (s->thread_args.log_complete &&
3164 	    s->selected_entry->idx == s->commits.ncommits - 1)
3165 		view->count = 0;
3166 
3167 	return NULL;
3168 }
3169 
3170 static void
3171 view_get_split(struct tog_view *view, int *y, int *x)
3172 {
3173 	*x = 0;
3174 	*y = 0;
3175 
3176 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3177 		if (view->child && view->child->resized_y)
3178 			*y = view->child->resized_y;
3179 		else if (view->resized_y)
3180 			*y = view->resized_y;
3181 		else
3182 			*y = view_split_begin_y(view->lines);
3183 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3184 		if (view->child && view->child->resized_x)
3185 			*x = view->child->resized_x;
3186 		else if (view->resized_x)
3187 			*x = view->resized_x;
3188 		else
3189 			*x = view_split_begin_x(view->begin_x);
3190 	}
3191 }
3192 
3193 /* Split view horizontally at y and offset view->state->selected line. */
3194 static const struct got_error *
3195 view_init_hsplit(struct tog_view *view, int y)
3196 {
3197 	const struct got_error *err = NULL;
3198 
3199 	view->nlines = y;
3200 	view->ncols = COLS;
3201 	err = view_resize(view);
3202 	if (err)
3203 		return err;
3204 
3205 	err = offset_selection_down(view);
3206 
3207 	return err;
3208 }
3209 
3210 static const struct got_error *
3211 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3212 {
3213 	const struct got_error *err = NULL;
3214 	struct tog_log_view_state *s = &view->state.log;
3215 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3216 	struct tog_view *ref_view = NULL;
3217 	struct commit_queue_entry *entry;
3218 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3219 
3220 	if (s->thread_args.load_all) {
3221 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3222 			s->thread_args.load_all = 0;
3223 		else if (s->thread_args.log_complete) {
3224 			err = log_move_cursor_down(view, s->commits.ncommits);
3225 			s->thread_args.load_all = 0;
3226 		}
3227 		return err;
3228 	}
3229 
3230 	eos = nscroll = view->nlines - 1;
3231 	if (view_is_hsplit_top(view))
3232 		--eos;  /* border */
3233 
3234 	switch (ch) {
3235 	case 'q':
3236 		s->quit = 1;
3237 		break;
3238 	case '0':
3239 		view->x = 0;
3240 		break;
3241 	case '$':
3242 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3243 		view->count = 0;
3244 		break;
3245 	case KEY_RIGHT:
3246 	case 'l':
3247 		if (view->x + view->ncols / 2 < view->maxx)
3248 			view->x += 2;  /* move two columns right */
3249 		else
3250 			view->count = 0;
3251 		break;
3252 	case KEY_LEFT:
3253 	case 'h':
3254 		view->x -= MIN(view->x, 2);  /* move two columns back */
3255 		if (view->x <= 0)
3256 			view->count = 0;
3257 		break;
3258 	case 'k':
3259 	case KEY_UP:
3260 	case '<':
3261 	case ',':
3262 	case CTRL('p'):
3263 		log_move_cursor_up(view, 0, 0);
3264 		break;
3265 	case 'g':
3266 	case KEY_HOME:
3267 		log_move_cursor_up(view, 0, 1);
3268 		view->count = 0;
3269 		break;
3270 	case CTRL('u'):
3271 	case 'u':
3272 		nscroll /= 2;
3273 		/* FALL THROUGH */
3274 	case KEY_PPAGE:
3275 	case CTRL('b'):
3276 	case 'b':
3277 		log_move_cursor_up(view, nscroll, 0);
3278 		break;
3279 	case 'j':
3280 	case KEY_DOWN:
3281 	case '>':
3282 	case '.':
3283 	case CTRL('n'):
3284 		err = log_move_cursor_down(view, 0);
3285 		break;
3286 	case '@':
3287 		s->use_committer = !s->use_committer;
3288 		break;
3289 	case 'G':
3290 	case KEY_END: {
3291 		/* We don't know yet how many commits, so we're forced to
3292 		 * traverse them all. */
3293 		view->count = 0;
3294 		if (!s->thread_args.log_complete) {
3295 			s->thread_args.load_all = 1;
3296 			return trigger_log_thread(view, 0);
3297 		}
3298 
3299 		s->selected = 0;
3300 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3301 		for (n = 0; n < eos; n++) {
3302 			if (entry == NULL)
3303 				break;
3304 			s->first_displayed_entry = entry;
3305 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3306 		}
3307 		if (n > 0)
3308 			s->selected = n - 1;
3309 		select_commit(s);
3310 		break;
3311 	}
3312 	case CTRL('d'):
3313 	case 'd':
3314 		nscroll /= 2;
3315 		/* FALL THROUGH */
3316 	case KEY_NPAGE:
3317 	case CTRL('f'):
3318 	case 'f':
3319 	case ' ':
3320 		err = log_move_cursor_down(view, nscroll);
3321 		break;
3322 	case KEY_RESIZE:
3323 		if (s->selected > view->nlines - 2)
3324 			s->selected = view->nlines - 2;
3325 		if (s->selected > s->commits.ncommits - 1)
3326 			s->selected = s->commits.ncommits - 1;
3327 		select_commit(s);
3328 		if (s->commits.ncommits < view->nlines - 1 &&
3329 		    !s->thread_args.log_complete) {
3330 			s->thread_args.commits_needed += (view->nlines - 1) -
3331 			    s->commits.ncommits;
3332 			err = trigger_log_thread(view, 1);
3333 		}
3334 		break;
3335 	case KEY_ENTER:
3336 	case '\r':
3337 		view->count = 0;
3338 		if (s->selected_entry == NULL)
3339 			break;
3340 
3341 		/* get dimensions--don't split till initialisation succeeds */
3342 		if (view_is_parent_view(view))
3343 			view_get_split(view, &begin_y, &begin_x);
3344 
3345 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3346 		    s->selected_entry->commit, s->selected_entry->id,
3347 		    view, s->repo);
3348 		if (err)
3349 			break;
3350 
3351 		if (view_is_parent_view(view) &&
3352 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3353 			err = view_init_hsplit(view, begin_y);
3354 			if (err)
3355 				break;
3356 		}
3357 
3358 		view->focussed = 0;
3359 		diff_view->focussed = 1;
3360 		diff_view->mode = view->mode;
3361 		diff_view->nlines = view->lines - begin_y;
3362 
3363 		if (view_is_parent_view(view)) {
3364 			view_transfer_size(diff_view, view);
3365 			err = view_close_child(view);
3366 			if (err)
3367 				return err;
3368 			err = view_set_child(view, diff_view);
3369 			if (err)
3370 				return err;
3371 			view->focus_child = 1;
3372 		} else
3373 			*new_view = diff_view;
3374 		break;
3375 	case 't':
3376 		view->count = 0;
3377 		if (s->selected_entry == NULL)
3378 			break;
3379 		if (view_is_parent_view(view))
3380 			view_get_split(view, &begin_y, &begin_x);
3381 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3382 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3383 		    s->repo);
3384 		if (err)
3385 			break;
3386 		if (view_is_parent_view(view) &&
3387 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3388 			err = view_init_hsplit(view, begin_y);
3389 			if (err)
3390 				break;
3391 		}
3392 		view->focussed = 0;
3393 		tree_view->focussed = 1;
3394 		tree_view->mode = view->mode;
3395 		tree_view->nlines = view->lines - begin_y;
3396 		if (view_is_parent_view(view)) {
3397 			view_transfer_size(tree_view, view);
3398 			err = view_close_child(view);
3399 			if (err)
3400 				return err;
3401 			err = view_set_child(view, tree_view);
3402 			if (err)
3403 				return err;
3404 			view->focus_child = 1;
3405 		} else
3406 			*new_view = tree_view;
3407 		break;
3408 	case KEY_BACKSPACE:
3409 	case CTRL('l'):
3410 	case 'B':
3411 		view->count = 0;
3412 		if (ch == KEY_BACKSPACE &&
3413 		    got_path_is_root_dir(s->in_repo_path))
3414 			break;
3415 		err = stop_log_thread(s);
3416 		if (err)
3417 			return err;
3418 		if (ch == KEY_BACKSPACE) {
3419 			char *parent_path;
3420 			err = got_path_dirname(&parent_path, s->in_repo_path);
3421 			if (err)
3422 				return err;
3423 			free(s->in_repo_path);
3424 			s->in_repo_path = parent_path;
3425 			s->thread_args.in_repo_path = s->in_repo_path;
3426 		} else if (ch == CTRL('l')) {
3427 			struct got_object_id *start_id;
3428 			err = got_repo_match_object_id(&start_id, NULL,
3429 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3430 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3431 			if (err)
3432 				return err;
3433 			free(s->start_id);
3434 			s->start_id = start_id;
3435 			s->thread_args.start_id = s->start_id;
3436 		} else /* 'B' */
3437 			s->log_branches = !s->log_branches;
3438 
3439 		if (s->thread_args.pack_fds == NULL) {
3440 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3441 			if (err)
3442 				return err;
3443 		}
3444 		err = got_repo_open(&s->thread_args.repo,
3445 		    got_repo_get_path(s->repo), NULL,
3446 		    s->thread_args.pack_fds);
3447 		if (err)
3448 			return err;
3449 		tog_free_refs();
3450 		err = tog_load_refs(s->repo, 0);
3451 		if (err)
3452 			return err;
3453 		err = got_commit_graph_open(&s->thread_args.graph,
3454 		    s->in_repo_path, !s->log_branches);
3455 		if (err)
3456 			return err;
3457 		err = got_commit_graph_iter_start(s->thread_args.graph,
3458 		    s->start_id, s->repo, NULL, NULL);
3459 		if (err)
3460 			return err;
3461 		free_commits(&s->commits);
3462 		s->first_displayed_entry = NULL;
3463 		s->last_displayed_entry = NULL;
3464 		s->selected_entry = NULL;
3465 		s->selected = 0;
3466 		s->thread_args.log_complete = 0;
3467 		s->quit = 0;
3468 		s->thread_args.commits_needed = view->lines;
3469 		s->matched_entry = NULL;
3470 		s->search_entry = NULL;
3471 		break;
3472 	case 'r':
3473 		view->count = 0;
3474 		if (view_is_parent_view(view))
3475 			view_get_split(view, &begin_y, &begin_x);
3476 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3477 		if (ref_view == NULL)
3478 			return got_error_from_errno("view_open");
3479 		err = open_ref_view(ref_view, s->repo);
3480 		if (err) {
3481 			view_close(ref_view);
3482 			return err;
3483 		}
3484 		if (view_is_parent_view(view) &&
3485 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3486 			err = view_init_hsplit(view, begin_y);
3487 			if (err)
3488 				break;
3489 		}
3490 		view->focussed = 0;
3491 		ref_view->focussed = 1;
3492 		ref_view->mode = view->mode;
3493 		ref_view->nlines = view->lines - begin_y;
3494 		if (view_is_parent_view(view)) {
3495 			view_transfer_size(ref_view, view);
3496 			err = view_close_child(view);
3497 			if (err)
3498 				return err;
3499 			err = view_set_child(view, ref_view);
3500 			if (err)
3501 				return err;
3502 			view->focus_child = 1;
3503 		} else
3504 			*new_view = ref_view;
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 const struct got_error *
3891 draw_file(struct tog_view *view, const char *header)
3892 {
3893 	struct tog_diff_view_state *s = &view->state.diff;
3894 	regmatch_t *regmatch = &view->regmatch;
3895 	const struct got_error *err;
3896 	int nprinted = 0;
3897 	char *line;
3898 	size_t linesize = 0;
3899 	ssize_t linelen;
3900 	struct tog_color *tc;
3901 	wchar_t *wline;
3902 	int width;
3903 	int max_lines = view->nlines;
3904 	int nlines = s->nlines;
3905 	off_t line_offset;
3906 
3907 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3908 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3909 		return got_error_from_errno("fseek");
3910 
3911 	werase(view->window);
3912 
3913 	if (header) {
3914 		if (asprintf(&line, "[%d/%d] %s",
3915 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3916 		    header) == -1)
3917 			return got_error_from_errno("asprintf");
3918 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3919 		    0, 0);
3920 		free(line);
3921 		if (err)
3922 			return err;
3923 
3924 		if (view_needs_focus_indication(view))
3925 			wstandout(view->window);
3926 		waddwstr(view->window, wline);
3927 		free(wline);
3928 		wline = NULL;
3929 		if (view_needs_focus_indication(view))
3930 			wstandend(view->window);
3931 		if (width <= view->ncols - 1)
3932 			waddch(view->window, '\n');
3933 
3934 		if (max_lines <= 1)
3935 			return NULL;
3936 		max_lines--;
3937 	}
3938 
3939 	s->eof = 0;
3940 	view->maxx = 0;
3941 	line = NULL;
3942 	while (max_lines > 0 && nprinted < max_lines) {
3943 		linelen = getline(&line, &linesize, s->f);
3944 		if (linelen == -1) {
3945 			if (feof(s->f)) {
3946 				s->eof = 1;
3947 				break;
3948 			}
3949 			free(line);
3950 			return got_ferror(s->f, GOT_ERR_IO);
3951 		}
3952 
3953 		/* Set view->maxx based on full line length. */
3954 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3955 		    view->x ? 1 : 0);
3956 		if (err) {
3957 			free(line);
3958 			return err;
3959 		}
3960 		view->maxx = MAX(view->maxx, width);
3961 		free(wline);
3962 		wline = NULL;
3963 
3964 		tc = match_color(&s->colors, line);
3965 		if (tc)
3966 			wattr_on(view->window,
3967 			    COLOR_PAIR(tc->colorpair), NULL);
3968 		if (s->first_displayed_line + nprinted == s->matched_line &&
3969 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3970 			err = add_matched_line(&width, line, view->ncols, 0,
3971 			    view->window, view->x, regmatch);
3972 			if (err) {
3973 				free(line);
3974 				return err;
3975 			}
3976 		} else {
3977 			int skip;
3978 			err = format_line(&wline, &width, &skip, line,
3979 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3980 			if (err) {
3981 				free(line);
3982 				return err;
3983 			}
3984 			waddwstr(view->window, &wline[skip]);
3985 			free(wline);
3986 			wline = NULL;
3987 		}
3988 		if (tc)
3989 			wattr_off(view->window,
3990 			    COLOR_PAIR(tc->colorpair), NULL);
3991 		if (width <= view->ncols - 1)
3992 			waddch(view->window, '\n');
3993 		nprinted++;
3994 	}
3995 	free(line);
3996 	if (nprinted >= 1)
3997 		s->last_displayed_line = s->first_displayed_line +
3998 		    (nprinted - 1);
3999 	else
4000 		s->last_displayed_line = s->first_displayed_line;
4001 
4002 	view_border(view);
4003 
4004 	if (s->eof) {
4005 		while (nprinted < view->nlines) {
4006 			waddch(view->window, '\n');
4007 			nprinted++;
4008 		}
4009 
4010 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4011 		    view->ncols, 0, 0);
4012 		if (err) {
4013 			return err;
4014 		}
4015 
4016 		wstandout(view->window);
4017 		waddwstr(view->window, wline);
4018 		free(wline);
4019 		wline = NULL;
4020 		wstandend(view->window);
4021 	}
4022 
4023 	return NULL;
4024 }
4025 
4026 static char *
4027 get_datestr(time_t *time, char *datebuf)
4028 {
4029 	struct tm mytm, *tm;
4030 	char *p, *s;
4031 
4032 	tm = gmtime_r(time, &mytm);
4033 	if (tm == NULL)
4034 		return NULL;
4035 	s = asctime_r(tm, datebuf);
4036 	if (s == NULL)
4037 		return NULL;
4038 	p = strchr(s, '\n');
4039 	if (p)
4040 		*p = '\0';
4041 	return s;
4042 }
4043 
4044 static const struct got_error *
4045 get_changed_paths(struct got_pathlist_head *paths,
4046     struct got_commit_object *commit, struct got_repository *repo)
4047 {
4048 	const struct got_error *err = NULL;
4049 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4050 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4051 	struct got_object_qid *qid;
4052 
4053 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4054 	if (qid != NULL) {
4055 		struct got_commit_object *pcommit;
4056 		err = got_object_open_as_commit(&pcommit, repo,
4057 		    &qid->id);
4058 		if (err)
4059 			return err;
4060 
4061 		tree_id1 = got_object_id_dup(
4062 		    got_object_commit_get_tree_id(pcommit));
4063 		if (tree_id1 == NULL) {
4064 			got_object_commit_close(pcommit);
4065 			return got_error_from_errno("got_object_id_dup");
4066 		}
4067 		got_object_commit_close(pcommit);
4068 
4069 	}
4070 
4071 	if (tree_id1) {
4072 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4073 		if (err)
4074 			goto done;
4075 	}
4076 
4077 	tree_id2 = got_object_commit_get_tree_id(commit);
4078 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4079 	if (err)
4080 		goto done;
4081 
4082 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4083 	    got_diff_tree_collect_changed_paths, paths, 0);
4084 done:
4085 	if (tree1)
4086 		got_object_tree_close(tree1);
4087 	if (tree2)
4088 		got_object_tree_close(tree2);
4089 	free(tree_id1);
4090 	return err;
4091 }
4092 
4093 static const struct got_error *
4094 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4095 {
4096 	off_t *p;
4097 
4098 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4099 	if (p == NULL)
4100 		return got_error_from_errno("reallocarray");
4101 	*line_offsets = p;
4102 	(*line_offsets)[*nlines] = off;
4103 	(*nlines)++;
4104 	return NULL;
4105 }
4106 
4107 static const struct got_error *
4108 write_commit_info(off_t **line_offsets, size_t *nlines,
4109     struct got_object_id *commit_id, struct got_reflist_head *refs,
4110     struct got_repository *repo, FILE *outfile)
4111 {
4112 	const struct got_error *err = NULL;
4113 	char datebuf[26], *datestr;
4114 	struct got_commit_object *commit;
4115 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4116 	time_t committer_time;
4117 	const char *author, *committer;
4118 	char *refs_str = NULL;
4119 	struct got_pathlist_head changed_paths;
4120 	struct got_pathlist_entry *pe;
4121 	off_t outoff = 0;
4122 	int n;
4123 
4124 	TAILQ_INIT(&changed_paths);
4125 
4126 	if (refs) {
4127 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4128 		if (err)
4129 			return err;
4130 	}
4131 
4132 	err = got_object_open_as_commit(&commit, repo, commit_id);
4133 	if (err)
4134 		return err;
4135 
4136 	err = got_object_id_str(&id_str, commit_id);
4137 	if (err) {
4138 		err = got_error_from_errno("got_object_id_str");
4139 		goto done;
4140 	}
4141 
4142 	err = add_line_offset(line_offsets, nlines, 0);
4143 	if (err)
4144 		goto done;
4145 
4146 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4147 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4148 	if (n < 0) {
4149 		err = got_error_from_errno("fprintf");
4150 		goto done;
4151 	}
4152 	outoff += n;
4153 	err = add_line_offset(line_offsets, nlines, outoff);
4154 	if (err)
4155 		goto done;
4156 
4157 	n = fprintf(outfile, "from: %s\n",
4158 	    got_object_commit_get_author(commit));
4159 	if (n < 0) {
4160 		err = got_error_from_errno("fprintf");
4161 		goto done;
4162 	}
4163 	outoff += n;
4164 	err = add_line_offset(line_offsets, nlines, outoff);
4165 	if (err)
4166 		goto done;
4167 
4168 	committer_time = got_object_commit_get_committer_time(commit);
4169 	datestr = get_datestr(&committer_time, datebuf);
4170 	if (datestr) {
4171 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4172 		if (n < 0) {
4173 			err = got_error_from_errno("fprintf");
4174 			goto done;
4175 		}
4176 		outoff += n;
4177 		err = add_line_offset(line_offsets, nlines, outoff);
4178 		if (err)
4179 			goto done;
4180 	}
4181 	author = got_object_commit_get_author(commit);
4182 	committer = got_object_commit_get_committer(commit);
4183 	if (strcmp(author, committer) != 0) {
4184 		n = fprintf(outfile, "via: %s\n", committer);
4185 		if (n < 0) {
4186 			err = got_error_from_errno("fprintf");
4187 			goto done;
4188 		}
4189 		outoff += n;
4190 		err = add_line_offset(line_offsets, nlines, outoff);
4191 		if (err)
4192 			goto done;
4193 	}
4194 	if (got_object_commit_get_nparents(commit) > 1) {
4195 		const struct got_object_id_queue *parent_ids;
4196 		struct got_object_qid *qid;
4197 		int pn = 1;
4198 		parent_ids = got_object_commit_get_parent_ids(commit);
4199 		STAILQ_FOREACH(qid, parent_ids, entry) {
4200 			err = got_object_id_str(&id_str, &qid->id);
4201 			if (err)
4202 				goto done;
4203 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4204 			if (n < 0) {
4205 				err = got_error_from_errno("fprintf");
4206 				goto done;
4207 			}
4208 			outoff += n;
4209 			err = add_line_offset(line_offsets, nlines, outoff);
4210 			if (err)
4211 				goto done;
4212 			free(id_str);
4213 			id_str = NULL;
4214 		}
4215 	}
4216 
4217 	err = got_object_commit_get_logmsg(&logmsg, commit);
4218 	if (err)
4219 		goto done;
4220 	s = logmsg;
4221 	while ((line = strsep(&s, "\n")) != NULL) {
4222 		n = fprintf(outfile, "%s\n", line);
4223 		if (n < 0) {
4224 			err = got_error_from_errno("fprintf");
4225 			goto done;
4226 		}
4227 		outoff += n;
4228 		err = add_line_offset(line_offsets, nlines, outoff);
4229 		if (err)
4230 			goto done;
4231 	}
4232 
4233 	err = get_changed_paths(&changed_paths, commit, repo);
4234 	if (err)
4235 		goto done;
4236 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4237 		struct got_diff_changed_path *cp = pe->data;
4238 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4239 		if (n < 0) {
4240 			err = got_error_from_errno("fprintf");
4241 			goto done;
4242 		}
4243 		outoff += n;
4244 		err = add_line_offset(line_offsets, nlines, outoff);
4245 		if (err)
4246 			goto done;
4247 		free((char *)pe->path);
4248 		free(pe->data);
4249 	}
4250 
4251 	fputc('\n', outfile);
4252 	outoff++;
4253 	err = add_line_offset(line_offsets, nlines, outoff);
4254 done:
4255 	got_pathlist_free(&changed_paths);
4256 	free(id_str);
4257 	free(logmsg);
4258 	free(refs_str);
4259 	got_object_commit_close(commit);
4260 	if (err) {
4261 		free(*line_offsets);
4262 		*line_offsets = NULL;
4263 		*nlines = 0;
4264 	}
4265 	return err;
4266 }
4267 
4268 static const struct got_error *
4269 create_diff(struct tog_diff_view_state *s)
4270 {
4271 	const struct got_error *err = NULL;
4272 	FILE *f = NULL;
4273 	int obj_type;
4274 
4275 	free(s->line_offsets);
4276 	s->line_offsets = malloc(sizeof(off_t));
4277 	if (s->line_offsets == NULL)
4278 		return got_error_from_errno("malloc");
4279 	s->nlines = 0;
4280 
4281 	f = got_opentemp();
4282 	if (f == NULL) {
4283 		err = got_error_from_errno("got_opentemp");
4284 		goto done;
4285 	}
4286 	if (s->f && fclose(s->f) == EOF) {
4287 		err = got_error_from_errno("fclose");
4288 		goto done;
4289 	}
4290 	s->f = f;
4291 
4292 	if (s->id1)
4293 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4294 	else
4295 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4296 	if (err)
4297 		goto done;
4298 
4299 	switch (obj_type) {
4300 	case GOT_OBJ_TYPE_BLOB:
4301 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4302 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4303 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4304 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4305 		break;
4306 	case GOT_OBJ_TYPE_TREE:
4307 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4308 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4309 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4310 		    s->force_text_diff, s->repo, s->f);
4311 		break;
4312 	case GOT_OBJ_TYPE_COMMIT: {
4313 		const struct got_object_id_queue *parent_ids;
4314 		struct got_object_qid *pid;
4315 		struct got_commit_object *commit2;
4316 		struct got_reflist_head *refs;
4317 
4318 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4319 		if (err)
4320 			goto done;
4321 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4322 		/* Show commit info if we're diffing to a parent/root commit. */
4323 		if (s->id1 == NULL) {
4324 			err = write_commit_info(&s->line_offsets, &s->nlines,
4325 			    s->id2, refs, s->repo, s->f);
4326 			if (err)
4327 				goto done;
4328 		} else {
4329 			parent_ids = got_object_commit_get_parent_ids(commit2);
4330 			STAILQ_FOREACH(pid, parent_ids, entry) {
4331 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4332 					err = write_commit_info(
4333 					    &s->line_offsets, &s->nlines,
4334 					    s->id2, refs, s->repo, s->f);
4335 					if (err)
4336 						goto done;
4337 					break;
4338 				}
4339 			}
4340 		}
4341 		got_object_commit_close(commit2);
4342 
4343 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4344 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4345 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4346 		    s->force_text_diff, s->repo, s->f);
4347 		break;
4348 	}
4349 	default:
4350 		err = got_error(GOT_ERR_OBJ_TYPE);
4351 		break;
4352 	}
4353 	if (err)
4354 		goto done;
4355 done:
4356 	if (s->f && fflush(s->f) != 0 && err == NULL)
4357 		err = got_error_from_errno("fflush");
4358 	return err;
4359 }
4360 
4361 static void
4362 diff_view_indicate_progress(struct tog_view *view)
4363 {
4364 	mvwaddstr(view->window, 0, 0, "diffing...");
4365 	update_panels();
4366 	doupdate();
4367 }
4368 
4369 static const struct got_error *
4370 search_start_diff_view(struct tog_view *view)
4371 {
4372 	struct tog_diff_view_state *s = &view->state.diff;
4373 
4374 	s->matched_line = 0;
4375 	return NULL;
4376 }
4377 
4378 static const struct got_error *
4379 search_next_diff_view(struct tog_view *view)
4380 {
4381 	struct tog_diff_view_state *s = &view->state.diff;
4382 	const struct got_error *err = NULL;
4383 	int lineno;
4384 	char *line = NULL;
4385 	size_t linesize = 0;
4386 	ssize_t linelen;
4387 
4388 	if (!view->searching) {
4389 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4390 		return NULL;
4391 	}
4392 
4393 	if (s->matched_line) {
4394 		if (view->searching == TOG_SEARCH_FORWARD)
4395 			lineno = s->matched_line + 1;
4396 		else
4397 			lineno = s->matched_line - 1;
4398 	} else
4399 		lineno = s->first_displayed_line;
4400 
4401 	while (1) {
4402 		off_t offset;
4403 
4404 		if (lineno <= 0 || lineno > s->nlines) {
4405 			if (s->matched_line == 0) {
4406 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4407 				break;
4408 			}
4409 
4410 			if (view->searching == TOG_SEARCH_FORWARD)
4411 				lineno = 1;
4412 			else
4413 				lineno = s->nlines;
4414 		}
4415 
4416 		offset = s->line_offsets[lineno - 1];
4417 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4418 			free(line);
4419 			return got_error_from_errno("fseeko");
4420 		}
4421 		linelen = getline(&line, &linesize, s->f);
4422 		if (linelen != -1) {
4423 			char *exstr;
4424 			err = expand_tab(&exstr, line);
4425 			if (err)
4426 				break;
4427 			if (match_line(exstr, &view->regex, 1,
4428 			    &view->regmatch)) {
4429 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4430 				s->matched_line = lineno;
4431 				free(exstr);
4432 				break;
4433 			}
4434 			free(exstr);
4435 		}
4436 		if (view->searching == TOG_SEARCH_FORWARD)
4437 			lineno++;
4438 		else
4439 			lineno--;
4440 	}
4441 	free(line);
4442 
4443 	if (s->matched_line) {
4444 		s->first_displayed_line = s->matched_line;
4445 		s->selected_line = 1;
4446 	}
4447 
4448 	return err;
4449 }
4450 
4451 static const struct got_error *
4452 close_diff_view(struct tog_view *view)
4453 {
4454 	const struct got_error *err = NULL;
4455 	struct tog_diff_view_state *s = &view->state.diff;
4456 
4457 	free(s->id1);
4458 	s->id1 = NULL;
4459 	free(s->id2);
4460 	s->id2 = NULL;
4461 	if (s->f && fclose(s->f) == EOF)
4462 		err = got_error_from_errno("fclose");
4463 	s->f = NULL;
4464 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4465 		err = got_error_from_errno("fclose");
4466 	s->f1 = NULL;
4467 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4468 		err = got_error_from_errno("fclose");
4469 	s->f2 = NULL;
4470 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4471 		err = got_error_from_errno("close");
4472 	s->fd1 = -1;
4473 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4474 		err = got_error_from_errno("close");
4475 	s->fd2 = -1;
4476 	free_colors(&s->colors);
4477 	free(s->line_offsets);
4478 	s->line_offsets = NULL;
4479 	s->nlines = 0;
4480 	return err;
4481 }
4482 
4483 static const struct got_error *
4484 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4485     struct got_object_id *id2, const char *label1, const char *label2,
4486     int diff_context, int ignore_whitespace, int force_text_diff,
4487     struct tog_view *parent_view, struct got_repository *repo)
4488 {
4489 	const struct got_error *err;
4490 	struct tog_diff_view_state *s = &view->state.diff;
4491 
4492 	memset(s, 0, sizeof(*s));
4493 	s->fd1 = -1;
4494 	s->fd2 = -1;
4495 
4496 	if (id1 != NULL && id2 != NULL) {
4497 	    int type1, type2;
4498 	    err = got_object_get_type(&type1, repo, id1);
4499 	    if (err)
4500 		return err;
4501 	    err = got_object_get_type(&type2, repo, id2);
4502 	    if (err)
4503 		return err;
4504 
4505 	    if (type1 != type2)
4506 		return got_error(GOT_ERR_OBJ_TYPE);
4507 	}
4508 	s->first_displayed_line = 1;
4509 	s->last_displayed_line = view->nlines;
4510 	s->selected_line = 1;
4511 	s->repo = repo;
4512 	s->id1 = id1;
4513 	s->id2 = id2;
4514 	s->label1 = label1;
4515 	s->label2 = label2;
4516 
4517 	if (id1) {
4518 		s->id1 = got_object_id_dup(id1);
4519 		if (s->id1 == NULL)
4520 			return got_error_from_errno("got_object_id_dup");
4521 	} else
4522 		s->id1 = NULL;
4523 
4524 	s->id2 = got_object_id_dup(id2);
4525 	if (s->id2 == NULL) {
4526 		err = got_error_from_errno("got_object_id_dup");
4527 		goto done;
4528 	}
4529 
4530 	s->f1 = got_opentemp();
4531 	if (s->f1 == NULL) {
4532 		err = got_error_from_errno("got_opentemp");
4533 		goto done;
4534 	}
4535 
4536 	s->f2 = got_opentemp();
4537 	if (s->f2 == NULL) {
4538 		err = got_error_from_errno("got_opentemp");
4539 		goto done;
4540 	}
4541 
4542 	s->fd1 = got_opentempfd();
4543 	if (s->fd1 == -1) {
4544 		err = got_error_from_errno("got_opentempfd");
4545 		goto done;
4546 	}
4547 
4548 	s->fd2 = got_opentempfd();
4549 	if (s->fd2 == -1) {
4550 		err = got_error_from_errno("got_opentempfd");
4551 		goto done;
4552 	}
4553 
4554 	s->first_displayed_line = 1;
4555 	s->last_displayed_line = view->nlines;
4556 	s->diff_context = diff_context;
4557 	s->ignore_whitespace = ignore_whitespace;
4558 	s->force_text_diff = force_text_diff;
4559 	s->parent_view = parent_view;
4560 	s->repo = repo;
4561 
4562 	STAILQ_INIT(&s->colors);
4563 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4564 		err = add_color(&s->colors,
4565 		    "^-", TOG_COLOR_DIFF_MINUS,
4566 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4567 		if (err)
4568 			goto done;
4569 		err = add_color(&s->colors, "^\\+",
4570 		    TOG_COLOR_DIFF_PLUS,
4571 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4572 		if (err)
4573 			goto done;
4574 		err = add_color(&s->colors,
4575 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4576 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4577 		if (err)
4578 			goto done;
4579 
4580 		err = add_color(&s->colors,
4581 		    "^(commit [0-9a-f]|parent [0-9]|"
4582 		    "(blob|file|tree|commit) [-+] |"
4583 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4584 		    get_color_value("TOG_COLOR_DIFF_META"));
4585 		if (err)
4586 			goto done;
4587 
4588 		err = add_color(&s->colors,
4589 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4590 		    get_color_value("TOG_COLOR_AUTHOR"));
4591 		if (err)
4592 			goto done;
4593 
4594 		err = add_color(&s->colors,
4595 		    "^date: ", TOG_COLOR_DATE,
4596 		    get_color_value("TOG_COLOR_DATE"));
4597 		if (err)
4598 			goto done;
4599 	}
4600 
4601 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4602 	    view_is_splitscreen(view))
4603 		show_log_view(parent_view); /* draw border */
4604 	diff_view_indicate_progress(view);
4605 
4606 	err = create_diff(s);
4607 
4608 	view->show = show_diff_view;
4609 	view->input = input_diff_view;
4610 	view->reset = reset_diff_view;
4611 	view->close = close_diff_view;
4612 	view->search_start = search_start_diff_view;
4613 	view->search_next = search_next_diff_view;
4614 done:
4615 	if (err)
4616 		close_diff_view(view);
4617 	return err;
4618 }
4619 
4620 static const struct got_error *
4621 show_diff_view(struct tog_view *view)
4622 {
4623 	const struct got_error *err;
4624 	struct tog_diff_view_state *s = &view->state.diff;
4625 	char *id_str1 = NULL, *id_str2, *header;
4626 	const char *label1, *label2;
4627 
4628 	if (s->id1) {
4629 		err = got_object_id_str(&id_str1, s->id1);
4630 		if (err)
4631 			return err;
4632 		label1 = s->label1 ? : id_str1;
4633 	} else
4634 		label1 = "/dev/null";
4635 
4636 	err = got_object_id_str(&id_str2, s->id2);
4637 	if (err)
4638 		return err;
4639 	label2 = s->label2 ? : id_str2;
4640 
4641 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4642 		err = got_error_from_errno("asprintf");
4643 		free(id_str1);
4644 		free(id_str2);
4645 		return err;
4646 	}
4647 	free(id_str1);
4648 	free(id_str2);
4649 
4650 	err = draw_file(view, header);
4651 	free(header);
4652 	return err;
4653 }
4654 
4655 static const struct got_error *
4656 set_selected_commit(struct tog_diff_view_state *s,
4657     struct commit_queue_entry *entry)
4658 {
4659 	const struct got_error *err;
4660 	const struct got_object_id_queue *parent_ids;
4661 	struct got_commit_object *selected_commit;
4662 	struct got_object_qid *pid;
4663 
4664 	free(s->id2);
4665 	s->id2 = got_object_id_dup(entry->id);
4666 	if (s->id2 == NULL)
4667 		return got_error_from_errno("got_object_id_dup");
4668 
4669 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4670 	if (err)
4671 		return err;
4672 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4673 	free(s->id1);
4674 	pid = STAILQ_FIRST(parent_ids);
4675 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4676 	got_object_commit_close(selected_commit);
4677 	return NULL;
4678 }
4679 
4680 static const struct got_error *
4681 reset_diff_view(struct tog_view *view)
4682 {
4683 	struct tog_diff_view_state *s = &view->state.diff;
4684 
4685 	view->count = 0;
4686 	wclear(view->window);
4687 	s->first_displayed_line = 1;
4688 	s->last_displayed_line = view->nlines;
4689 	s->matched_line = 0;
4690 	diff_view_indicate_progress(view);
4691 	return create_diff(s);
4692 }
4693 
4694 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4695     int, int, int);
4696 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4697     int, int);
4698 
4699 static const struct got_error *
4700 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4701 {
4702 	const struct got_error *err = NULL;
4703 	struct tog_diff_view_state *s = &view->state.diff;
4704 	struct tog_log_view_state *ls;
4705 	struct commit_queue_entry *old_selected_entry;
4706 	char *line = NULL;
4707 	size_t linesize = 0;
4708 	ssize_t linelen;
4709 	int i, nscroll = view->nlines - 1, up = 0;
4710 
4711 	switch (ch) {
4712 	case '0':
4713 		view->x = 0;
4714 		break;
4715 	case '$':
4716 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4717 		view->count = 0;
4718 		break;
4719 	case KEY_RIGHT:
4720 	case 'l':
4721 		if (view->x + view->ncols / 3 < view->maxx)
4722 			view->x += 2;  /* move two columns right */
4723 		else
4724 			view->count = 0;
4725 		break;
4726 	case KEY_LEFT:
4727 	case 'h':
4728 		view->x -= MIN(view->x, 2);  /* move two columns back */
4729 		if (view->x <= 0)
4730 			view->count = 0;
4731 		break;
4732 	case 'a':
4733 	case 'w':
4734 		if (ch == 'a')
4735 			s->force_text_diff = !s->force_text_diff;
4736 		if (ch == 'w')
4737 			s->ignore_whitespace = !s->ignore_whitespace;
4738 		err = reset_diff_view(view);
4739 		break;
4740 	case 'g':
4741 	case KEY_HOME:
4742 		s->first_displayed_line = 1;
4743 		view->count = 0;
4744 		break;
4745 	case 'G':
4746 	case KEY_END:
4747 		view->count = 0;
4748 		if (s->eof)
4749 			break;
4750 
4751 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4752 		s->eof = 1;
4753 		break;
4754 	case 'k':
4755 	case KEY_UP:
4756 	case CTRL('p'):
4757 		if (s->first_displayed_line > 1)
4758 			s->first_displayed_line--;
4759 		else
4760 			view->count = 0;
4761 		break;
4762 	case CTRL('u'):
4763 	case 'u':
4764 		nscroll /= 2;
4765 		/* FALL THROUGH */
4766 	case KEY_PPAGE:
4767 	case CTRL('b'):
4768 	case 'b':
4769 		if (s->first_displayed_line == 1) {
4770 			view->count = 0;
4771 			break;
4772 		}
4773 		i = 0;
4774 		while (i++ < nscroll && s->first_displayed_line > 1)
4775 			s->first_displayed_line--;
4776 		break;
4777 	case 'j':
4778 	case KEY_DOWN:
4779 	case CTRL('n'):
4780 		if (!s->eof)
4781 			s->first_displayed_line++;
4782 		else
4783 			view->count = 0;
4784 		break;
4785 	case CTRL('d'):
4786 	case 'd':
4787 		nscroll /= 2;
4788 		/* FALL THROUGH */
4789 	case KEY_NPAGE:
4790 	case CTRL('f'):
4791 	case 'f':
4792 	case ' ':
4793 		if (s->eof) {
4794 			view->count = 0;
4795 			break;
4796 		}
4797 		i = 0;
4798 		while (!s->eof && i++ < nscroll) {
4799 			linelen = getline(&line, &linesize, s->f);
4800 			s->first_displayed_line++;
4801 			if (linelen == -1) {
4802 				if (feof(s->f)) {
4803 					s->eof = 1;
4804 				} else
4805 					err = got_ferror(s->f, GOT_ERR_IO);
4806 				break;
4807 			}
4808 		}
4809 		free(line);
4810 		break;
4811 	case '[':
4812 		if (s->diff_context > 0) {
4813 			s->diff_context--;
4814 			s->matched_line = 0;
4815 			diff_view_indicate_progress(view);
4816 			err = create_diff(s);
4817 			if (s->first_displayed_line + view->nlines - 1 >
4818 			    s->nlines) {
4819 				s->first_displayed_line = 1;
4820 				s->last_displayed_line = view->nlines;
4821 			}
4822 		} else
4823 			view->count = 0;
4824 		break;
4825 	case ']':
4826 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4827 			s->diff_context++;
4828 			s->matched_line = 0;
4829 			diff_view_indicate_progress(view);
4830 			err = create_diff(s);
4831 		} else
4832 			view->count = 0;
4833 		break;
4834 	case '<':
4835 	case ',':
4836 	case 'K':
4837 		up = 1;
4838 		/* FALL THROUGH */
4839 	case '>':
4840 	case '.':
4841 	case 'J':
4842 		if (s->parent_view == NULL) {
4843 			view->count = 0;
4844 			break;
4845 		}
4846 		s->parent_view->count = view->count;
4847 
4848 		if (s->parent_view->type == TOG_VIEW_LOG) {
4849 			ls = &s->parent_view->state.log;
4850 			old_selected_entry = ls->selected_entry;
4851 
4852 			err = input_log_view(NULL, s->parent_view,
4853 			    up ? KEY_UP : KEY_DOWN);
4854 			if (err)
4855 				break;
4856 			view->count = s->parent_view->count;
4857 
4858 			if (old_selected_entry == ls->selected_entry)
4859 				break;
4860 
4861 			err = set_selected_commit(s, ls->selected_entry);
4862 			if (err)
4863 				break;
4864 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4865 			struct tog_blame_view_state *bs;
4866 			struct got_object_id *id, *prev_id;
4867 
4868 			bs = &s->parent_view->state.blame;
4869 			prev_id = get_annotation_for_line(bs->blame.lines,
4870 			    bs->blame.nlines, bs->last_diffed_line);
4871 
4872 			err = input_blame_view(&view, s->parent_view,
4873 			    up ? KEY_UP : KEY_DOWN);
4874 			if (err)
4875 				break;
4876 			view->count = s->parent_view->count;
4877 
4878 			if (prev_id == NULL)
4879 				break;
4880 			id = get_selected_commit_id(bs->blame.lines,
4881 			    bs->blame.nlines, bs->first_displayed_line,
4882 			    bs->selected_line);
4883 			if (id == NULL)
4884 				break;
4885 
4886 			if (!got_object_id_cmp(prev_id, id))
4887 				break;
4888 
4889 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4890 			if (err)
4891 				break;
4892 		}
4893 		s->first_displayed_line = 1;
4894 		s->last_displayed_line = view->nlines;
4895 		s->matched_line = 0;
4896 		view->x = 0;
4897 
4898 		diff_view_indicate_progress(view);
4899 		err = create_diff(s);
4900 		break;
4901 	default:
4902 		view->count = 0;
4903 		break;
4904 	}
4905 
4906 	return err;
4907 }
4908 
4909 static const struct got_error *
4910 cmd_diff(int argc, char *argv[])
4911 {
4912 	const struct got_error *error = NULL;
4913 	struct got_repository *repo = NULL;
4914 	struct got_worktree *worktree = NULL;
4915 	struct got_object_id *id1 = NULL, *id2 = NULL;
4916 	char *repo_path = NULL, *cwd = NULL;
4917 	char *id_str1 = NULL, *id_str2 = NULL;
4918 	char *label1 = NULL, *label2 = NULL;
4919 	int diff_context = 3, ignore_whitespace = 0;
4920 	int ch, force_text_diff = 0;
4921 	const char *errstr;
4922 	struct tog_view *view;
4923 	int *pack_fds = NULL;
4924 
4925 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4926 		switch (ch) {
4927 		case 'a':
4928 			force_text_diff = 1;
4929 			break;
4930 		case 'C':
4931 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4932 			    &errstr);
4933 			if (errstr != NULL)
4934 				errx(1, "number of context lines is %s: %s",
4935 				    errstr, errstr);
4936 			break;
4937 		case 'r':
4938 			repo_path = realpath(optarg, NULL);
4939 			if (repo_path == NULL)
4940 				return got_error_from_errno2("realpath",
4941 				    optarg);
4942 			got_path_strip_trailing_slashes(repo_path);
4943 			break;
4944 		case 'w':
4945 			ignore_whitespace = 1;
4946 			break;
4947 		default:
4948 			usage_diff();
4949 			/* NOTREACHED */
4950 		}
4951 	}
4952 
4953 	argc -= optind;
4954 	argv += optind;
4955 
4956 	if (argc == 0) {
4957 		usage_diff(); /* TODO show local worktree changes */
4958 	} else if (argc == 2) {
4959 		id_str1 = argv[0];
4960 		id_str2 = argv[1];
4961 	} else
4962 		usage_diff();
4963 
4964 	error = got_repo_pack_fds_open(&pack_fds);
4965 	if (error)
4966 		goto done;
4967 
4968 	if (repo_path == NULL) {
4969 		cwd = getcwd(NULL, 0);
4970 		if (cwd == NULL)
4971 			return got_error_from_errno("getcwd");
4972 		error = got_worktree_open(&worktree, cwd);
4973 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4974 			goto done;
4975 		if (worktree)
4976 			repo_path =
4977 			    strdup(got_worktree_get_repo_path(worktree));
4978 		else
4979 			repo_path = strdup(cwd);
4980 		if (repo_path == NULL) {
4981 			error = got_error_from_errno("strdup");
4982 			goto done;
4983 		}
4984 	}
4985 
4986 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4987 	if (error)
4988 		goto done;
4989 
4990 	init_curses();
4991 
4992 	error = apply_unveil(got_repo_get_path(repo), NULL);
4993 	if (error)
4994 		goto done;
4995 
4996 	error = tog_load_refs(repo, 0);
4997 	if (error)
4998 		goto done;
4999 
5000 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5001 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5002 	if (error)
5003 		goto done;
5004 
5005 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5006 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5007 	if (error)
5008 		goto done;
5009 
5010 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5011 	if (view == NULL) {
5012 		error = got_error_from_errno("view_open");
5013 		goto done;
5014 	}
5015 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5016 	    ignore_whitespace, force_text_diff, NULL,  repo);
5017 	if (error)
5018 		goto done;
5019 	error = view_loop(view);
5020 done:
5021 	free(label1);
5022 	free(label2);
5023 	free(repo_path);
5024 	free(cwd);
5025 	if (repo) {
5026 		const struct got_error *close_err = got_repo_close(repo);
5027 		if (error == NULL)
5028 			error = close_err;
5029 	}
5030 	if (worktree)
5031 		got_worktree_close(worktree);
5032 	if (pack_fds) {
5033 		const struct got_error *pack_err =
5034 		    got_repo_pack_fds_close(pack_fds);
5035 		if (error == NULL)
5036 			error = pack_err;
5037 	}
5038 	tog_free_refs();
5039 	return error;
5040 }
5041 
5042 __dead static void
5043 usage_blame(void)
5044 {
5045 	endwin();
5046 	fprintf(stderr,
5047 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5048 	    getprogname());
5049 	exit(1);
5050 }
5051 
5052 struct tog_blame_line {
5053 	int annotated;
5054 	struct got_object_id *id;
5055 };
5056 
5057 static const struct got_error *
5058 draw_blame(struct tog_view *view)
5059 {
5060 	struct tog_blame_view_state *s = &view->state.blame;
5061 	struct tog_blame *blame = &s->blame;
5062 	regmatch_t *regmatch = &view->regmatch;
5063 	const struct got_error *err;
5064 	int lineno = 0, nprinted = 0;
5065 	char *line = NULL;
5066 	size_t linesize = 0;
5067 	ssize_t linelen;
5068 	wchar_t *wline;
5069 	int width;
5070 	struct tog_blame_line *blame_line;
5071 	struct got_object_id *prev_id = NULL;
5072 	char *id_str;
5073 	struct tog_color *tc;
5074 
5075 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5076 	if (err)
5077 		return err;
5078 
5079 	rewind(blame->f);
5080 	werase(view->window);
5081 
5082 	if (asprintf(&line, "commit %s", id_str) == -1) {
5083 		err = got_error_from_errno("asprintf");
5084 		free(id_str);
5085 		return err;
5086 	}
5087 
5088 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5089 	free(line);
5090 	line = NULL;
5091 	if (err)
5092 		return err;
5093 	if (view_needs_focus_indication(view))
5094 		wstandout(view->window);
5095 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5096 	if (tc)
5097 		wattr_on(view->window,
5098 		    COLOR_PAIR(tc->colorpair), NULL);
5099 	waddwstr(view->window, wline);
5100 	if (tc)
5101 		wattr_off(view->window,
5102 		    COLOR_PAIR(tc->colorpair), NULL);
5103 	if (view_needs_focus_indication(view))
5104 		wstandend(view->window);
5105 	free(wline);
5106 	wline = NULL;
5107 	if (width < view->ncols - 1)
5108 		waddch(view->window, '\n');
5109 
5110 	if (asprintf(&line, "[%d/%d] %s%s",
5111 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5112 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5113 		free(id_str);
5114 		return got_error_from_errno("asprintf");
5115 	}
5116 	free(id_str);
5117 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5118 	free(line);
5119 	line = NULL;
5120 	if (err)
5121 		return err;
5122 	waddwstr(view->window, wline);
5123 	free(wline);
5124 	wline = NULL;
5125 	if (width < view->ncols - 1)
5126 		waddch(view->window, '\n');
5127 
5128 	s->eof = 0;
5129 	view->maxx = 0;
5130 	while (nprinted < view->nlines - 2) {
5131 		linelen = getline(&line, &linesize, blame->f);
5132 		if (linelen == -1) {
5133 			if (feof(blame->f)) {
5134 				s->eof = 1;
5135 				break;
5136 			}
5137 			free(line);
5138 			return got_ferror(blame->f, GOT_ERR_IO);
5139 		}
5140 		if (++lineno < s->first_displayed_line)
5141 			continue;
5142 
5143 		/* Set view->maxx based on full line length. */
5144 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5145 		if (err) {
5146 			free(line);
5147 			return err;
5148 		}
5149 		free(wline);
5150 		wline = NULL;
5151 		view->maxx = MAX(view->maxx, width);
5152 
5153 		if (nprinted == s->selected_line - 1)
5154 			wstandout(view->window);
5155 
5156 		if (blame->nlines > 0) {
5157 			blame_line = &blame->lines[lineno - 1];
5158 			if (blame_line->annotated && prev_id &&
5159 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5160 			    !(nprinted == s->selected_line - 1)) {
5161 				waddstr(view->window, "        ");
5162 			} else if (blame_line->annotated) {
5163 				char *id_str;
5164 				err = got_object_id_str(&id_str,
5165 				    blame_line->id);
5166 				if (err) {
5167 					free(line);
5168 					return err;
5169 				}
5170 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5171 				if (tc)
5172 					wattr_on(view->window,
5173 					    COLOR_PAIR(tc->colorpair), NULL);
5174 				wprintw(view->window, "%.8s", id_str);
5175 				if (tc)
5176 					wattr_off(view->window,
5177 					    COLOR_PAIR(tc->colorpair), NULL);
5178 				free(id_str);
5179 				prev_id = blame_line->id;
5180 			} else {
5181 				waddstr(view->window, "........");
5182 				prev_id = NULL;
5183 			}
5184 		} else {
5185 			waddstr(view->window, "........");
5186 			prev_id = NULL;
5187 		}
5188 
5189 		if (nprinted == s->selected_line - 1)
5190 			wstandend(view->window);
5191 		waddstr(view->window, " ");
5192 
5193 		if (view->ncols <= 9) {
5194 			width = 9;
5195 		} else if (s->first_displayed_line + nprinted ==
5196 		    s->matched_line &&
5197 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5198 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5199 			    view->window, view->x, regmatch);
5200 			if (err) {
5201 				free(line);
5202 				return err;
5203 			}
5204 			width += 9;
5205 		} else {
5206 			int skip;
5207 			err = format_line(&wline, &width, &skip, line,
5208 			    view->x, view->ncols - 9, 9, 1);
5209 			if (err) {
5210 				free(line);
5211 				return err;
5212 			}
5213 			waddwstr(view->window, &wline[skip]);
5214 			width += 9;
5215 			free(wline);
5216 			wline = NULL;
5217 		}
5218 
5219 		if (width <= view->ncols - 1)
5220 			waddch(view->window, '\n');
5221 		if (++nprinted == 1)
5222 			s->first_displayed_line = lineno;
5223 	}
5224 	free(line);
5225 	s->last_displayed_line = lineno;
5226 
5227 	view_border(view);
5228 
5229 	return NULL;
5230 }
5231 
5232 static const struct got_error *
5233 blame_cb(void *arg, int nlines, int lineno,
5234     struct got_commit_object *commit, struct got_object_id *id)
5235 {
5236 	const struct got_error *err = NULL;
5237 	struct tog_blame_cb_args *a = arg;
5238 	struct tog_blame_line *line;
5239 	int errcode;
5240 
5241 	if (nlines != a->nlines ||
5242 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5243 		return got_error(GOT_ERR_RANGE);
5244 
5245 	errcode = pthread_mutex_lock(&tog_mutex);
5246 	if (errcode)
5247 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5248 
5249 	if (*a->quit) {	/* user has quit the blame view */
5250 		err = got_error(GOT_ERR_ITER_COMPLETED);
5251 		goto done;
5252 	}
5253 
5254 	if (lineno == -1)
5255 		goto done; /* no change in this commit */
5256 
5257 	line = &a->lines[lineno - 1];
5258 	if (line->annotated)
5259 		goto done;
5260 
5261 	line->id = got_object_id_dup(id);
5262 	if (line->id == NULL) {
5263 		err = got_error_from_errno("got_object_id_dup");
5264 		goto done;
5265 	}
5266 	line->annotated = 1;
5267 done:
5268 	errcode = pthread_mutex_unlock(&tog_mutex);
5269 	if (errcode)
5270 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5271 	return err;
5272 }
5273 
5274 static void *
5275 blame_thread(void *arg)
5276 {
5277 	const struct got_error *err, *close_err;
5278 	struct tog_blame_thread_args *ta = arg;
5279 	struct tog_blame_cb_args *a = ta->cb_args;
5280 	int errcode, fd1 = -1, fd2 = -1;
5281 	FILE *f1 = NULL, *f2 = NULL;
5282 
5283 	fd1 = got_opentempfd();
5284 	if (fd1 == -1)
5285 		return (void *)got_error_from_errno("got_opentempfd");
5286 
5287 	fd2 = got_opentempfd();
5288 	if (fd2 == -1) {
5289 		err = got_error_from_errno("got_opentempfd");
5290 		goto done;
5291 	}
5292 
5293 	f1 = got_opentemp();
5294 	if (f1 == NULL) {
5295 		err = (void *)got_error_from_errno("got_opentemp");
5296 		goto done;
5297 	}
5298 	f2 = got_opentemp();
5299 	if (f2 == NULL) {
5300 		err = (void *)got_error_from_errno("got_opentemp");
5301 		goto done;
5302 	}
5303 
5304 	err = block_signals_used_by_main_thread();
5305 	if (err)
5306 		goto done;
5307 
5308 	err = got_blame(ta->path, a->commit_id, ta->repo,
5309 	    tog_diff_algo, blame_cb, ta->cb_args,
5310 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5311 	if (err && err->code == GOT_ERR_CANCELLED)
5312 		err = NULL;
5313 
5314 	errcode = pthread_mutex_lock(&tog_mutex);
5315 	if (errcode) {
5316 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5317 		goto done;
5318 	}
5319 
5320 	close_err = got_repo_close(ta->repo);
5321 	if (err == NULL)
5322 		err = close_err;
5323 	ta->repo = NULL;
5324 	*ta->complete = 1;
5325 
5326 	errcode = pthread_mutex_unlock(&tog_mutex);
5327 	if (errcode && err == NULL)
5328 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5329 
5330 done:
5331 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5332 		err = got_error_from_errno("close");
5333 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5334 		err = got_error_from_errno("close");
5335 	if (f1 && fclose(f1) == EOF && err == NULL)
5336 		err = got_error_from_errno("fclose");
5337 	if (f2 && fclose(f2) == EOF && err == NULL)
5338 		err = got_error_from_errno("fclose");
5339 
5340 	return (void *)err;
5341 }
5342 
5343 static struct got_object_id *
5344 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5345     int first_displayed_line, int selected_line)
5346 {
5347 	struct tog_blame_line *line;
5348 
5349 	if (nlines <= 0)
5350 		return NULL;
5351 
5352 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5353 	if (!line->annotated)
5354 		return NULL;
5355 
5356 	return line->id;
5357 }
5358 
5359 static struct got_object_id *
5360 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5361     int lineno)
5362 {
5363 	struct tog_blame_line *line;
5364 
5365 	if (nlines <= 0 || lineno >= nlines)
5366 		return NULL;
5367 
5368 	line = &lines[lineno - 1];
5369 	if (!line->annotated)
5370 		return NULL;
5371 
5372 	return line->id;
5373 }
5374 
5375 static const struct got_error *
5376 stop_blame(struct tog_blame *blame)
5377 {
5378 	const struct got_error *err = NULL;
5379 	int i;
5380 
5381 	if (blame->thread) {
5382 		int errcode;
5383 		errcode = pthread_mutex_unlock(&tog_mutex);
5384 		if (errcode)
5385 			return got_error_set_errno(errcode,
5386 			    "pthread_mutex_unlock");
5387 		errcode = pthread_join(blame->thread, (void **)&err);
5388 		if (errcode)
5389 			return got_error_set_errno(errcode, "pthread_join");
5390 		errcode = pthread_mutex_lock(&tog_mutex);
5391 		if (errcode)
5392 			return got_error_set_errno(errcode,
5393 			    "pthread_mutex_lock");
5394 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5395 			err = NULL;
5396 		blame->thread = 0; //NULL;
5397 	}
5398 	if (blame->thread_args.repo) {
5399 		const struct got_error *close_err;
5400 		close_err = got_repo_close(blame->thread_args.repo);
5401 		if (err == NULL)
5402 			err = close_err;
5403 		blame->thread_args.repo = NULL;
5404 	}
5405 	if (blame->f) {
5406 		if (fclose(blame->f) == EOF && err == NULL)
5407 			err = got_error_from_errno("fclose");
5408 		blame->f = NULL;
5409 	}
5410 	if (blame->lines) {
5411 		for (i = 0; i < blame->nlines; i++)
5412 			free(blame->lines[i].id);
5413 		free(blame->lines);
5414 		blame->lines = NULL;
5415 	}
5416 	free(blame->cb_args.commit_id);
5417 	blame->cb_args.commit_id = NULL;
5418 	if (blame->pack_fds) {
5419 		const struct got_error *pack_err =
5420 		    got_repo_pack_fds_close(blame->pack_fds);
5421 		if (err == NULL)
5422 			err = pack_err;
5423 		blame->pack_fds = NULL;
5424 	}
5425 	return err;
5426 }
5427 
5428 static const struct got_error *
5429 cancel_blame_view(void *arg)
5430 {
5431 	const struct got_error *err = NULL;
5432 	int *done = arg;
5433 	int errcode;
5434 
5435 	errcode = pthread_mutex_lock(&tog_mutex);
5436 	if (errcode)
5437 		return got_error_set_errno(errcode,
5438 		    "pthread_mutex_unlock");
5439 
5440 	if (*done)
5441 		err = got_error(GOT_ERR_CANCELLED);
5442 
5443 	errcode = pthread_mutex_unlock(&tog_mutex);
5444 	if (errcode)
5445 		return got_error_set_errno(errcode,
5446 		    "pthread_mutex_lock");
5447 
5448 	return err;
5449 }
5450 
5451 static const struct got_error *
5452 run_blame(struct tog_view *view)
5453 {
5454 	struct tog_blame_view_state *s = &view->state.blame;
5455 	struct tog_blame *blame = &s->blame;
5456 	const struct got_error *err = NULL;
5457 	struct got_commit_object *commit = NULL;
5458 	struct got_blob_object *blob = NULL;
5459 	struct got_repository *thread_repo = NULL;
5460 	struct got_object_id *obj_id = NULL;
5461 	int obj_type, fd = -1;
5462 	int *pack_fds = NULL;
5463 
5464 	err = got_object_open_as_commit(&commit, s->repo,
5465 	    &s->blamed_commit->id);
5466 	if (err)
5467 		return err;
5468 
5469 	fd = got_opentempfd();
5470 	if (fd == -1) {
5471 		err = got_error_from_errno("got_opentempfd");
5472 		goto done;
5473 	}
5474 
5475 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5476 	if (err)
5477 		goto done;
5478 
5479 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5480 	if (err)
5481 		goto done;
5482 
5483 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5484 		err = got_error(GOT_ERR_OBJ_TYPE);
5485 		goto done;
5486 	}
5487 
5488 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5489 	if (err)
5490 		goto done;
5491 	blame->f = got_opentemp();
5492 	if (blame->f == NULL) {
5493 		err = got_error_from_errno("got_opentemp");
5494 		goto done;
5495 	}
5496 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5497 	    &blame->line_offsets, blame->f, blob);
5498 	if (err)
5499 		goto done;
5500 	if (blame->nlines == 0) {
5501 		s->blame_complete = 1;
5502 		goto done;
5503 	}
5504 
5505 	/* Don't include \n at EOF in the blame line count. */
5506 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5507 		blame->nlines--;
5508 
5509 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5510 	if (blame->lines == NULL) {
5511 		err = got_error_from_errno("calloc");
5512 		goto done;
5513 	}
5514 
5515 	err = got_repo_pack_fds_open(&pack_fds);
5516 	if (err)
5517 		goto done;
5518 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5519 	    pack_fds);
5520 	if (err)
5521 		goto done;
5522 
5523 	blame->pack_fds = pack_fds;
5524 	blame->cb_args.view = view;
5525 	blame->cb_args.lines = blame->lines;
5526 	blame->cb_args.nlines = blame->nlines;
5527 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5528 	if (blame->cb_args.commit_id == NULL) {
5529 		err = got_error_from_errno("got_object_id_dup");
5530 		goto done;
5531 	}
5532 	blame->cb_args.quit = &s->done;
5533 
5534 	blame->thread_args.path = s->path;
5535 	blame->thread_args.repo = thread_repo;
5536 	blame->thread_args.cb_args = &blame->cb_args;
5537 	blame->thread_args.complete = &s->blame_complete;
5538 	blame->thread_args.cancel_cb = cancel_blame_view;
5539 	blame->thread_args.cancel_arg = &s->done;
5540 	s->blame_complete = 0;
5541 
5542 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5543 		s->first_displayed_line = 1;
5544 		s->last_displayed_line = view->nlines;
5545 		s->selected_line = 1;
5546 	}
5547 	s->matched_line = 0;
5548 
5549 done:
5550 	if (commit)
5551 		got_object_commit_close(commit);
5552 	if (fd != -1 && close(fd) == -1 && err == NULL)
5553 		err = got_error_from_errno("close");
5554 	if (blob)
5555 		got_object_blob_close(blob);
5556 	free(obj_id);
5557 	if (err)
5558 		stop_blame(blame);
5559 	return err;
5560 }
5561 
5562 static const struct got_error *
5563 open_blame_view(struct tog_view *view, char *path,
5564     struct got_object_id *commit_id, struct got_repository *repo)
5565 {
5566 	const struct got_error *err = NULL;
5567 	struct tog_blame_view_state *s = &view->state.blame;
5568 
5569 	STAILQ_INIT(&s->blamed_commits);
5570 
5571 	s->path = strdup(path);
5572 	if (s->path == NULL)
5573 		return got_error_from_errno("strdup");
5574 
5575 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5576 	if (err) {
5577 		free(s->path);
5578 		return err;
5579 	}
5580 
5581 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5582 	s->first_displayed_line = 1;
5583 	s->last_displayed_line = view->nlines;
5584 	s->selected_line = 1;
5585 	s->blame_complete = 0;
5586 	s->repo = repo;
5587 	s->commit_id = commit_id;
5588 	memset(&s->blame, 0, sizeof(s->blame));
5589 
5590 	STAILQ_INIT(&s->colors);
5591 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5592 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5593 		    get_color_value("TOG_COLOR_COMMIT"));
5594 		if (err)
5595 			return err;
5596 	}
5597 
5598 	view->show = show_blame_view;
5599 	view->input = input_blame_view;
5600 	view->reset = reset_blame_view;
5601 	view->close = close_blame_view;
5602 	view->search_start = search_start_blame_view;
5603 	view->search_next = search_next_blame_view;
5604 
5605 	return run_blame(view);
5606 }
5607 
5608 static const struct got_error *
5609 close_blame_view(struct tog_view *view)
5610 {
5611 	const struct got_error *err = NULL;
5612 	struct tog_blame_view_state *s = &view->state.blame;
5613 
5614 	if (s->blame.thread)
5615 		err = stop_blame(&s->blame);
5616 
5617 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5618 		struct got_object_qid *blamed_commit;
5619 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5620 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5621 		got_object_qid_free(blamed_commit);
5622 	}
5623 
5624 	free(s->path);
5625 	free_colors(&s->colors);
5626 	return err;
5627 }
5628 
5629 static const struct got_error *
5630 search_start_blame_view(struct tog_view *view)
5631 {
5632 	struct tog_blame_view_state *s = &view->state.blame;
5633 
5634 	s->matched_line = 0;
5635 	return NULL;
5636 }
5637 
5638 static const struct got_error *
5639 search_next_blame_view(struct tog_view *view)
5640 {
5641 	struct tog_blame_view_state *s = &view->state.blame;
5642 	const struct got_error *err = NULL;
5643 	int lineno;
5644 	char *line = NULL;
5645 	size_t linesize = 0;
5646 	ssize_t linelen;
5647 
5648 	if (!view->searching) {
5649 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5650 		return NULL;
5651 	}
5652 
5653 	if (s->matched_line) {
5654 		if (view->searching == TOG_SEARCH_FORWARD)
5655 			lineno = s->matched_line + 1;
5656 		else
5657 			lineno = s->matched_line - 1;
5658 	} else
5659 		lineno = s->first_displayed_line - 1 + s->selected_line;
5660 
5661 	while (1) {
5662 		off_t offset;
5663 
5664 		if (lineno <= 0 || lineno > s->blame.nlines) {
5665 			if (s->matched_line == 0) {
5666 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5667 				break;
5668 			}
5669 
5670 			if (view->searching == TOG_SEARCH_FORWARD)
5671 				lineno = 1;
5672 			else
5673 				lineno = s->blame.nlines;
5674 		}
5675 
5676 		offset = s->blame.line_offsets[lineno - 1];
5677 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5678 			free(line);
5679 			return got_error_from_errno("fseeko");
5680 		}
5681 		linelen = getline(&line, &linesize, s->blame.f);
5682 		if (linelen != -1) {
5683 			char *exstr;
5684 			err = expand_tab(&exstr, line);
5685 			if (err)
5686 				break;
5687 			if (match_line(exstr, &view->regex, 1,
5688 			    &view->regmatch)) {
5689 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5690 				s->matched_line = lineno;
5691 				free(exstr);
5692 				break;
5693 			}
5694 			free(exstr);
5695 		}
5696 		if (view->searching == TOG_SEARCH_FORWARD)
5697 			lineno++;
5698 		else
5699 			lineno--;
5700 	}
5701 	free(line);
5702 
5703 	if (s->matched_line) {
5704 		s->first_displayed_line = s->matched_line;
5705 		s->selected_line = 1;
5706 	}
5707 
5708 	return err;
5709 }
5710 
5711 static const struct got_error *
5712 show_blame_view(struct tog_view *view)
5713 {
5714 	const struct got_error *err = NULL;
5715 	struct tog_blame_view_state *s = &view->state.blame;
5716 	int errcode;
5717 
5718 	if (s->blame.thread == 0 && !s->blame_complete) {
5719 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5720 		    &s->blame.thread_args);
5721 		if (errcode)
5722 			return got_error_set_errno(errcode, "pthread_create");
5723 
5724 		halfdelay(1); /* fast refresh while annotating  */
5725 	}
5726 
5727 	if (s->blame_complete)
5728 		halfdelay(10); /* disable fast refresh */
5729 
5730 	err = draw_blame(view);
5731 
5732 	view_border(view);
5733 	return err;
5734 }
5735 
5736 static const struct got_error *
5737 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5738     struct got_repository *repo, struct got_object_id *id)
5739 {
5740 	struct tog_view		*log_view;
5741 	const struct got_error	*err = NULL;
5742 
5743 	*new_view = NULL;
5744 
5745 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5746 	if (log_view == NULL)
5747 		return got_error_from_errno("view_open");
5748 
5749 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5750 	if (err)
5751 		view_close(log_view);
5752 	else
5753 		*new_view = log_view;
5754 
5755 	return err;
5756 }
5757 
5758 static const struct got_error *
5759 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5760 {
5761 	const struct got_error *err = NULL, *thread_err = NULL;
5762 	struct tog_view *diff_view, *log_view;
5763 	struct tog_blame_view_state *s = &view->state.blame;
5764 	int eos, nscroll, begin_y = 0, begin_x = 0;
5765 
5766 	eos = nscroll = view->nlines - 2;
5767 	if (view_is_hsplit_top(view))
5768 		--eos;  /* border */
5769 
5770 	switch (ch) {
5771 	case '0':
5772 		view->x = 0;
5773 		break;
5774 	case '$':
5775 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5776 		view->count = 0;
5777 		break;
5778 	case KEY_RIGHT:
5779 	case 'l':
5780 		if (view->x + view->ncols / 3 < view->maxx)
5781 			view->x += 2;  /* move two columns right */
5782 		else
5783 			view->count = 0;
5784 		break;
5785 	case KEY_LEFT:
5786 	case 'h':
5787 		view->x -= MIN(view->x, 2);  /* move two columns back */
5788 		if (view->x <= 0)
5789 			view->count = 0;
5790 		break;
5791 	case 'q':
5792 		s->done = 1;
5793 		break;
5794 	case 'g':
5795 	case KEY_HOME:
5796 		s->selected_line = 1;
5797 		s->first_displayed_line = 1;
5798 		view->count = 0;
5799 		break;
5800 	case 'G':
5801 	case KEY_END:
5802 		if (s->blame.nlines < eos) {
5803 			s->selected_line = s->blame.nlines;
5804 			s->first_displayed_line = 1;
5805 		} else {
5806 			s->selected_line = eos;
5807 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5808 		}
5809 		view->count = 0;
5810 		break;
5811 	case 'k':
5812 	case KEY_UP:
5813 	case CTRL('p'):
5814 		if (s->selected_line > 1)
5815 			s->selected_line--;
5816 		else if (s->selected_line == 1 &&
5817 		    s->first_displayed_line > 1)
5818 			s->first_displayed_line--;
5819 		else
5820 			view->count = 0;
5821 		break;
5822 	case CTRL('u'):
5823 	case 'u':
5824 		nscroll /= 2;
5825 		/* FALL THROUGH */
5826 	case KEY_PPAGE:
5827 	case CTRL('b'):
5828 	case 'b':
5829 		if (s->first_displayed_line == 1) {
5830 			if (view->count > 1)
5831 				nscroll += nscroll;
5832 			s->selected_line = MAX(1, s->selected_line - nscroll);
5833 			view->count = 0;
5834 			break;
5835 		}
5836 		if (s->first_displayed_line > nscroll)
5837 			s->first_displayed_line -= nscroll;
5838 		else
5839 			s->first_displayed_line = 1;
5840 		break;
5841 	case 'j':
5842 	case KEY_DOWN:
5843 	case CTRL('n'):
5844 		if (s->selected_line < eos && s->first_displayed_line +
5845 		    s->selected_line <= s->blame.nlines)
5846 			s->selected_line++;
5847 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5848 			s->first_displayed_line++;
5849 		else
5850 			view->count = 0;
5851 		break;
5852 	case 'c':
5853 	case 'p': {
5854 		struct got_object_id *id = NULL;
5855 
5856 		view->count = 0;
5857 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5858 		    s->first_displayed_line, s->selected_line);
5859 		if (id == NULL)
5860 			break;
5861 		if (ch == 'p') {
5862 			struct got_commit_object *commit, *pcommit;
5863 			struct got_object_qid *pid;
5864 			struct got_object_id *blob_id = NULL;
5865 			int obj_type;
5866 			err = got_object_open_as_commit(&commit,
5867 			    s->repo, id);
5868 			if (err)
5869 				break;
5870 			pid = STAILQ_FIRST(
5871 			    got_object_commit_get_parent_ids(commit));
5872 			if (pid == NULL) {
5873 				got_object_commit_close(commit);
5874 				break;
5875 			}
5876 			/* Check if path history ends here. */
5877 			err = got_object_open_as_commit(&pcommit,
5878 			    s->repo, &pid->id);
5879 			if (err)
5880 				break;
5881 			err = got_object_id_by_path(&blob_id, s->repo,
5882 			    pcommit, s->path);
5883 			got_object_commit_close(pcommit);
5884 			if (err) {
5885 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5886 					err = NULL;
5887 				got_object_commit_close(commit);
5888 				break;
5889 			}
5890 			err = got_object_get_type(&obj_type, s->repo,
5891 			    blob_id);
5892 			free(blob_id);
5893 			/* Can't blame non-blob type objects. */
5894 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5895 				got_object_commit_close(commit);
5896 				break;
5897 			}
5898 			err = got_object_qid_alloc(&s->blamed_commit,
5899 			    &pid->id);
5900 			got_object_commit_close(commit);
5901 		} else {
5902 			if (got_object_id_cmp(id,
5903 			    &s->blamed_commit->id) == 0)
5904 				break;
5905 			err = got_object_qid_alloc(&s->blamed_commit,
5906 			    id);
5907 		}
5908 		if (err)
5909 			break;
5910 		s->done = 1;
5911 		thread_err = stop_blame(&s->blame);
5912 		s->done = 0;
5913 		if (thread_err)
5914 			break;
5915 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5916 		    s->blamed_commit, entry);
5917 		err = run_blame(view);
5918 		if (err)
5919 			break;
5920 		break;
5921 	}
5922 	case 'C': {
5923 		struct got_object_qid *first;
5924 
5925 		view->count = 0;
5926 		first = STAILQ_FIRST(&s->blamed_commits);
5927 		if (!got_object_id_cmp(&first->id, s->commit_id))
5928 			break;
5929 		s->done = 1;
5930 		thread_err = stop_blame(&s->blame);
5931 		s->done = 0;
5932 		if (thread_err)
5933 			break;
5934 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5935 		got_object_qid_free(s->blamed_commit);
5936 		s->blamed_commit =
5937 		    STAILQ_FIRST(&s->blamed_commits);
5938 		err = run_blame(view);
5939 		if (err)
5940 			break;
5941 		break;
5942 	}
5943 	case 'L': {
5944 		struct got_object_id *id = NULL;
5945 
5946 		view->count = 0;
5947 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5948 		    s->first_displayed_line, s->selected_line);
5949 		if (id == NULL)
5950 			break;
5951 
5952 		if (view_is_parent_view(view))
5953 			view_get_split(view, &begin_y, &begin_x);
5954 		err = log_annotated_line(&log_view, begin_y, begin_x,
5955 		    s->repo, id);
5956 		if (err)
5957 			break;
5958 		if (view_is_parent_view(view) &&
5959 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5960 			err = view_init_hsplit(view, begin_y);
5961 			if (err)
5962 				break;
5963 		}
5964 
5965 		view->focussed = 0;
5966 		log_view->focussed = 1;
5967 		log_view->mode = view->mode;
5968 		log_view->nlines = view->lines - begin_y;
5969 		if (view_is_parent_view(view)) {
5970 			view_transfer_size(log_view, view);
5971 			err = view_close_child(view);
5972 			if (err)
5973 				return err;
5974 			err = view_set_child(view, log_view);
5975 			if (err)
5976 				return err;
5977 			view->focus_child = 1;
5978 		} else
5979 			*new_view = log_view;
5980 		break;
5981 	}
5982 	case KEY_ENTER:
5983 	case '\r': {
5984 		struct got_object_id *id = NULL;
5985 		struct got_object_qid *pid;
5986 		struct got_commit_object *commit = NULL;
5987 
5988 		view->count = 0;
5989 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5990 		    s->first_displayed_line, s->selected_line);
5991 		if (id == NULL)
5992 			break;
5993 		err = got_object_open_as_commit(&commit, s->repo, id);
5994 		if (err)
5995 			break;
5996 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5997 		if (*new_view) {
5998 			/* traversed from diff view, release diff resources  */
5999 			err = close_diff_view(*new_view);
6000 			if (err)
6001 				break;
6002 			diff_view = *new_view;
6003 		} else {
6004 			if (view_is_parent_view(view))
6005 				view_get_split(view, &begin_y, &begin_x);
6006 
6007 			diff_view = view_open(0, 0, begin_y, begin_x,
6008 			    TOG_VIEW_DIFF);
6009 			if (diff_view == NULL) {
6010 				got_object_commit_close(commit);
6011 				err = got_error_from_errno("view_open");
6012 				break;
6013 			}
6014 		}
6015 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6016 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6017 		got_object_commit_close(commit);
6018 		if (err) {
6019 			view_close(diff_view);
6020 			break;
6021 		}
6022 		s->last_diffed_line = s->first_displayed_line - 1 +
6023 		    s->selected_line;
6024 		if (*new_view)
6025 			break;	/* still open from active diff view */
6026 		if (view_is_parent_view(view) &&
6027 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6028 			err = view_init_hsplit(view, begin_y);
6029 			if (err)
6030 				break;
6031 		}
6032 
6033 		view->focussed = 0;
6034 		diff_view->focussed = 1;
6035 		diff_view->mode = view->mode;
6036 		diff_view->nlines = view->lines - begin_y;
6037 		if (view_is_parent_view(view)) {
6038 			view_transfer_size(diff_view, view);
6039 			err = view_close_child(view);
6040 			if (err)
6041 				break;
6042 			err = view_set_child(view, diff_view);
6043 			if (err)
6044 				break;
6045 			view->focus_child = 1;
6046 		} else
6047 			*new_view = diff_view;
6048 		if (err)
6049 			break;
6050 		break;
6051 	}
6052 	case CTRL('d'):
6053 	case 'd':
6054 		nscroll /= 2;
6055 		/* FALL THROUGH */
6056 	case KEY_NPAGE:
6057 	case CTRL('f'):
6058 	case 'f':
6059 	case ' ':
6060 		if (s->last_displayed_line >= s->blame.nlines &&
6061 		    s->selected_line >= MIN(s->blame.nlines,
6062 		    view->nlines - 2)) {
6063 			view->count = 0;
6064 			break;
6065 		}
6066 		if (s->last_displayed_line >= s->blame.nlines &&
6067 		    s->selected_line < view->nlines - 2) {
6068 			s->selected_line +=
6069 			    MIN(nscroll, s->last_displayed_line -
6070 			    s->first_displayed_line - s->selected_line + 1);
6071 		}
6072 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6073 			s->first_displayed_line += nscroll;
6074 		else
6075 			s->first_displayed_line =
6076 			    s->blame.nlines - (view->nlines - 3);
6077 		break;
6078 	case KEY_RESIZE:
6079 		if (s->selected_line > view->nlines - 2) {
6080 			s->selected_line = MIN(s->blame.nlines,
6081 			    view->nlines - 2);
6082 		}
6083 		break;
6084 	default:
6085 		view->count = 0;
6086 		break;
6087 	}
6088 	return thread_err ? thread_err : err;
6089 }
6090 
6091 static const struct got_error *
6092 reset_blame_view(struct tog_view *view)
6093 {
6094 	const struct got_error *err;
6095 	struct tog_blame_view_state *s = &view->state.blame;
6096 
6097 	view->count = 0;
6098 	s->done = 1;
6099 	err = stop_blame(&s->blame);
6100 	s->done = 0;
6101 	if (err)
6102 		return err;
6103 	return run_blame(view);
6104 }
6105 
6106 static const struct got_error *
6107 cmd_blame(int argc, char *argv[])
6108 {
6109 	const struct got_error *error;
6110 	struct got_repository *repo = NULL;
6111 	struct got_worktree *worktree = NULL;
6112 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6113 	char *link_target = NULL;
6114 	struct got_object_id *commit_id = NULL;
6115 	struct got_commit_object *commit = NULL;
6116 	char *commit_id_str = NULL;
6117 	int ch;
6118 	struct tog_view *view;
6119 	int *pack_fds = NULL;
6120 
6121 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6122 		switch (ch) {
6123 		case 'c':
6124 			commit_id_str = optarg;
6125 			break;
6126 		case 'r':
6127 			repo_path = realpath(optarg, NULL);
6128 			if (repo_path == NULL)
6129 				return got_error_from_errno2("realpath",
6130 				    optarg);
6131 			break;
6132 		default:
6133 			usage_blame();
6134 			/* NOTREACHED */
6135 		}
6136 	}
6137 
6138 	argc -= optind;
6139 	argv += optind;
6140 
6141 	if (argc != 1)
6142 		usage_blame();
6143 
6144 	error = got_repo_pack_fds_open(&pack_fds);
6145 	if (error != NULL)
6146 		goto done;
6147 
6148 	if (repo_path == NULL) {
6149 		cwd = getcwd(NULL, 0);
6150 		if (cwd == NULL)
6151 			return got_error_from_errno("getcwd");
6152 		error = got_worktree_open(&worktree, cwd);
6153 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6154 			goto done;
6155 		if (worktree)
6156 			repo_path =
6157 			    strdup(got_worktree_get_repo_path(worktree));
6158 		else
6159 			repo_path = strdup(cwd);
6160 		if (repo_path == NULL) {
6161 			error = got_error_from_errno("strdup");
6162 			goto done;
6163 		}
6164 	}
6165 
6166 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6167 	if (error != NULL)
6168 		goto done;
6169 
6170 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6171 	    worktree);
6172 	if (error)
6173 		goto done;
6174 
6175 	init_curses();
6176 
6177 	error = apply_unveil(got_repo_get_path(repo), NULL);
6178 	if (error)
6179 		goto done;
6180 
6181 	error = tog_load_refs(repo, 0);
6182 	if (error)
6183 		goto done;
6184 
6185 	if (commit_id_str == NULL) {
6186 		struct got_reference *head_ref;
6187 		error = got_ref_open(&head_ref, repo, worktree ?
6188 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6189 		if (error != NULL)
6190 			goto done;
6191 		error = got_ref_resolve(&commit_id, repo, head_ref);
6192 		got_ref_close(head_ref);
6193 	} else {
6194 		error = got_repo_match_object_id(&commit_id, NULL,
6195 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6196 	}
6197 	if (error != NULL)
6198 		goto done;
6199 
6200 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6201 	if (view == NULL) {
6202 		error = got_error_from_errno("view_open");
6203 		goto done;
6204 	}
6205 
6206 	error = got_object_open_as_commit(&commit, repo, commit_id);
6207 	if (error)
6208 		goto done;
6209 
6210 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6211 	    commit, repo);
6212 	if (error)
6213 		goto done;
6214 
6215 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6216 	    commit_id, repo);
6217 	if (error)
6218 		goto done;
6219 	if (worktree) {
6220 		/* Release work tree lock. */
6221 		got_worktree_close(worktree);
6222 		worktree = NULL;
6223 	}
6224 	error = view_loop(view);
6225 done:
6226 	free(repo_path);
6227 	free(in_repo_path);
6228 	free(link_target);
6229 	free(cwd);
6230 	free(commit_id);
6231 	if (commit)
6232 		got_object_commit_close(commit);
6233 	if (worktree)
6234 		got_worktree_close(worktree);
6235 	if (repo) {
6236 		const struct got_error *close_err = got_repo_close(repo);
6237 		if (error == NULL)
6238 			error = close_err;
6239 	}
6240 	if (pack_fds) {
6241 		const struct got_error *pack_err =
6242 		    got_repo_pack_fds_close(pack_fds);
6243 		if (error == NULL)
6244 			error = pack_err;
6245 	}
6246 	tog_free_refs();
6247 	return error;
6248 }
6249 
6250 static const struct got_error *
6251 draw_tree_entries(struct tog_view *view, const char *parent_path)
6252 {
6253 	struct tog_tree_view_state *s = &view->state.tree;
6254 	const struct got_error *err = NULL;
6255 	struct got_tree_entry *te;
6256 	wchar_t *wline;
6257 	struct tog_color *tc;
6258 	int width, n, i, nentries;
6259 	int limit = view->nlines;
6260 
6261 	s->ndisplayed = 0;
6262 	if (view_is_hsplit_top(view))
6263 		--limit;  /* border */
6264 
6265 	werase(view->window);
6266 
6267 	if (limit == 0)
6268 		return NULL;
6269 
6270 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6271 	    0, 0);
6272 	if (err)
6273 		return err;
6274 	if (view_needs_focus_indication(view))
6275 		wstandout(view->window);
6276 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6277 	if (tc)
6278 		wattr_on(view->window,
6279 		    COLOR_PAIR(tc->colorpair), NULL);
6280 	waddwstr(view->window, wline);
6281 	if (tc)
6282 		wattr_off(view->window,
6283 		    COLOR_PAIR(tc->colorpair), NULL);
6284 	if (view_needs_focus_indication(view))
6285 		wstandend(view->window);
6286 	free(wline);
6287 	wline = NULL;
6288 	if (width < view->ncols - 1)
6289 		waddch(view->window, '\n');
6290 	if (--limit <= 0)
6291 		return NULL;
6292 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6293 	    0, 0);
6294 	if (err)
6295 		return err;
6296 	waddwstr(view->window, wline);
6297 	free(wline);
6298 	wline = NULL;
6299 	if (width < view->ncols - 1)
6300 		waddch(view->window, '\n');
6301 	if (--limit <= 0)
6302 		return NULL;
6303 	waddch(view->window, '\n');
6304 	if (--limit <= 0)
6305 		return NULL;
6306 
6307 	if (s->first_displayed_entry == NULL) {
6308 		te = got_object_tree_get_first_entry(s->tree);
6309 		if (s->selected == 0) {
6310 			if (view->focussed)
6311 				wstandout(view->window);
6312 			s->selected_entry = NULL;
6313 		}
6314 		waddstr(view->window, "  ..\n");	/* parent directory */
6315 		if (s->selected == 0 && view->focussed)
6316 			wstandend(view->window);
6317 		s->ndisplayed++;
6318 		if (--limit <= 0)
6319 			return NULL;
6320 		n = 1;
6321 	} else {
6322 		n = 0;
6323 		te = s->first_displayed_entry;
6324 	}
6325 
6326 	nentries = got_object_tree_get_nentries(s->tree);
6327 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6328 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6329 		const char *modestr = "";
6330 		mode_t mode;
6331 
6332 		te = got_object_tree_get_entry(s->tree, i);
6333 		mode = got_tree_entry_get_mode(te);
6334 
6335 		if (s->show_ids) {
6336 			err = got_object_id_str(&id_str,
6337 			    got_tree_entry_get_id(te));
6338 			if (err)
6339 				return got_error_from_errno(
6340 				    "got_object_id_str");
6341 		}
6342 		if (got_object_tree_entry_is_submodule(te))
6343 			modestr = "$";
6344 		else if (S_ISLNK(mode)) {
6345 			int i;
6346 
6347 			err = got_tree_entry_get_symlink_target(&link_target,
6348 			    te, s->repo);
6349 			if (err) {
6350 				free(id_str);
6351 				return err;
6352 			}
6353 			for (i = 0; i < strlen(link_target); i++) {
6354 				if (!isprint((unsigned char)link_target[i]))
6355 					link_target[i] = '?';
6356 			}
6357 			modestr = "@";
6358 		}
6359 		else if (S_ISDIR(mode))
6360 			modestr = "/";
6361 		else if (mode & S_IXUSR)
6362 			modestr = "*";
6363 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6364 		    got_tree_entry_get_name(te), modestr,
6365 		    link_target ? " -> ": "",
6366 		    link_target ? link_target : "") == -1) {
6367 			free(id_str);
6368 			free(link_target);
6369 			return got_error_from_errno("asprintf");
6370 		}
6371 		free(id_str);
6372 		free(link_target);
6373 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6374 		    0, 0);
6375 		if (err) {
6376 			free(line);
6377 			break;
6378 		}
6379 		if (n == s->selected) {
6380 			if (view->focussed)
6381 				wstandout(view->window);
6382 			s->selected_entry = te;
6383 		}
6384 		tc = match_color(&s->colors, line);
6385 		if (tc)
6386 			wattr_on(view->window,
6387 			    COLOR_PAIR(tc->colorpair), NULL);
6388 		waddwstr(view->window, wline);
6389 		if (tc)
6390 			wattr_off(view->window,
6391 			    COLOR_PAIR(tc->colorpair), NULL);
6392 		if (width < view->ncols - 1)
6393 			waddch(view->window, '\n');
6394 		if (n == s->selected && view->focussed)
6395 			wstandend(view->window);
6396 		free(line);
6397 		free(wline);
6398 		wline = NULL;
6399 		n++;
6400 		s->ndisplayed++;
6401 		s->last_displayed_entry = te;
6402 		if (--limit <= 0)
6403 			break;
6404 	}
6405 
6406 	return err;
6407 }
6408 
6409 static void
6410 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6411 {
6412 	struct got_tree_entry *te;
6413 	int isroot = s->tree == s->root;
6414 	int i = 0;
6415 
6416 	if (s->first_displayed_entry == NULL)
6417 		return;
6418 
6419 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6420 	while (i++ < maxscroll) {
6421 		if (te == NULL) {
6422 			if (!isroot)
6423 				s->first_displayed_entry = NULL;
6424 			break;
6425 		}
6426 		s->first_displayed_entry = te;
6427 		te = got_tree_entry_get_prev(s->tree, te);
6428 	}
6429 }
6430 
6431 static const struct got_error *
6432 tree_scroll_down(struct tog_view *view, int maxscroll)
6433 {
6434 	struct tog_tree_view_state *s = &view->state.tree;
6435 	struct got_tree_entry *next, *last;
6436 	int n = 0;
6437 
6438 	if (s->first_displayed_entry)
6439 		next = got_tree_entry_get_next(s->tree,
6440 		    s->first_displayed_entry);
6441 	else
6442 		next = got_object_tree_get_first_entry(s->tree);
6443 
6444 	last = s->last_displayed_entry;
6445 	while (next && n++ < maxscroll) {
6446 		if (last)
6447 			last = got_tree_entry_get_next(s->tree, last);
6448 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6449 			s->first_displayed_entry = next;
6450 			next = got_tree_entry_get_next(s->tree, next);
6451 		}
6452 	}
6453 
6454 	return NULL;
6455 }
6456 
6457 static const struct got_error *
6458 tree_entry_path(char **path, struct tog_parent_trees *parents,
6459     struct got_tree_entry *te)
6460 {
6461 	const struct got_error *err = NULL;
6462 	struct tog_parent_tree *pt;
6463 	size_t len = 2; /* for leading slash and NUL */
6464 
6465 	TAILQ_FOREACH(pt, parents, entry)
6466 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6467 		    + 1 /* slash */;
6468 	if (te)
6469 		len += strlen(got_tree_entry_get_name(te));
6470 
6471 	*path = calloc(1, len);
6472 	if (path == NULL)
6473 		return got_error_from_errno("calloc");
6474 
6475 	(*path)[0] = '/';
6476 	pt = TAILQ_LAST(parents, tog_parent_trees);
6477 	while (pt) {
6478 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6479 		if (strlcat(*path, name, len) >= len) {
6480 			err = got_error(GOT_ERR_NO_SPACE);
6481 			goto done;
6482 		}
6483 		if (strlcat(*path, "/", len) >= len) {
6484 			err = got_error(GOT_ERR_NO_SPACE);
6485 			goto done;
6486 		}
6487 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6488 	}
6489 	if (te) {
6490 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6491 			err = got_error(GOT_ERR_NO_SPACE);
6492 			goto done;
6493 		}
6494 	}
6495 done:
6496 	if (err) {
6497 		free(*path);
6498 		*path = NULL;
6499 	}
6500 	return err;
6501 }
6502 
6503 static const struct got_error *
6504 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6505     struct got_tree_entry *te, struct tog_parent_trees *parents,
6506     struct got_object_id *commit_id, struct got_repository *repo)
6507 {
6508 	const struct got_error *err = NULL;
6509 	char *path;
6510 	struct tog_view *blame_view;
6511 
6512 	*new_view = NULL;
6513 
6514 	err = tree_entry_path(&path, parents, te);
6515 	if (err)
6516 		return err;
6517 
6518 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6519 	if (blame_view == NULL) {
6520 		err = got_error_from_errno("view_open");
6521 		goto done;
6522 	}
6523 
6524 	err = open_blame_view(blame_view, path, commit_id, repo);
6525 	if (err) {
6526 		if (err->code == GOT_ERR_CANCELLED)
6527 			err = NULL;
6528 		view_close(blame_view);
6529 	} else
6530 		*new_view = blame_view;
6531 done:
6532 	free(path);
6533 	return err;
6534 }
6535 
6536 static const struct got_error *
6537 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6538     struct tog_tree_view_state *s)
6539 {
6540 	struct tog_view *log_view;
6541 	const struct got_error *err = NULL;
6542 	char *path;
6543 
6544 	*new_view = NULL;
6545 
6546 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6547 	if (log_view == NULL)
6548 		return got_error_from_errno("view_open");
6549 
6550 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6551 	if (err)
6552 		return err;
6553 
6554 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6555 	    path, 0);
6556 	if (err)
6557 		view_close(log_view);
6558 	else
6559 		*new_view = log_view;
6560 	free(path);
6561 	return err;
6562 }
6563 
6564 static const struct got_error *
6565 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6566     const char *head_ref_name, struct got_repository *repo)
6567 {
6568 	const struct got_error *err = NULL;
6569 	char *commit_id_str = NULL;
6570 	struct tog_tree_view_state *s = &view->state.tree;
6571 	struct got_commit_object *commit = NULL;
6572 
6573 	TAILQ_INIT(&s->parents);
6574 	STAILQ_INIT(&s->colors);
6575 
6576 	s->commit_id = got_object_id_dup(commit_id);
6577 	if (s->commit_id == NULL)
6578 		return got_error_from_errno("got_object_id_dup");
6579 
6580 	err = got_object_open_as_commit(&commit, repo, commit_id);
6581 	if (err)
6582 		goto done;
6583 
6584 	/*
6585 	 * The root is opened here and will be closed when the view is closed.
6586 	 * Any visited subtrees and their path-wise parents are opened and
6587 	 * closed on demand.
6588 	 */
6589 	err = got_object_open_as_tree(&s->root, repo,
6590 	    got_object_commit_get_tree_id(commit));
6591 	if (err)
6592 		goto done;
6593 	s->tree = s->root;
6594 
6595 	err = got_object_id_str(&commit_id_str, commit_id);
6596 	if (err != NULL)
6597 		goto done;
6598 
6599 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6600 		err = got_error_from_errno("asprintf");
6601 		goto done;
6602 	}
6603 
6604 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6605 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6606 	if (head_ref_name) {
6607 		s->head_ref_name = strdup(head_ref_name);
6608 		if (s->head_ref_name == NULL) {
6609 			err = got_error_from_errno("strdup");
6610 			goto done;
6611 		}
6612 	}
6613 	s->repo = repo;
6614 
6615 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6616 		err = add_color(&s->colors, "\\$$",
6617 		    TOG_COLOR_TREE_SUBMODULE,
6618 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6619 		if (err)
6620 			goto done;
6621 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6622 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6623 		if (err)
6624 			goto done;
6625 		err = add_color(&s->colors, "/$",
6626 		    TOG_COLOR_TREE_DIRECTORY,
6627 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6628 		if (err)
6629 			goto done;
6630 
6631 		err = add_color(&s->colors, "\\*$",
6632 		    TOG_COLOR_TREE_EXECUTABLE,
6633 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6634 		if (err)
6635 			goto done;
6636 
6637 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6638 		    get_color_value("TOG_COLOR_COMMIT"));
6639 		if (err)
6640 			goto done;
6641 	}
6642 
6643 	view->show = show_tree_view;
6644 	view->input = input_tree_view;
6645 	view->close = close_tree_view;
6646 	view->search_start = search_start_tree_view;
6647 	view->search_next = search_next_tree_view;
6648 done:
6649 	free(commit_id_str);
6650 	if (commit)
6651 		got_object_commit_close(commit);
6652 	if (err)
6653 		close_tree_view(view);
6654 	return err;
6655 }
6656 
6657 static const struct got_error *
6658 close_tree_view(struct tog_view *view)
6659 {
6660 	struct tog_tree_view_state *s = &view->state.tree;
6661 
6662 	free_colors(&s->colors);
6663 	free(s->tree_label);
6664 	s->tree_label = NULL;
6665 	free(s->commit_id);
6666 	s->commit_id = NULL;
6667 	free(s->head_ref_name);
6668 	s->head_ref_name = NULL;
6669 	while (!TAILQ_EMPTY(&s->parents)) {
6670 		struct tog_parent_tree *parent;
6671 		parent = TAILQ_FIRST(&s->parents);
6672 		TAILQ_REMOVE(&s->parents, parent, entry);
6673 		if (parent->tree != s->root)
6674 			got_object_tree_close(parent->tree);
6675 		free(parent);
6676 
6677 	}
6678 	if (s->tree != NULL && s->tree != s->root)
6679 		got_object_tree_close(s->tree);
6680 	if (s->root)
6681 		got_object_tree_close(s->root);
6682 	return NULL;
6683 }
6684 
6685 static const struct got_error *
6686 search_start_tree_view(struct tog_view *view)
6687 {
6688 	struct tog_tree_view_state *s = &view->state.tree;
6689 
6690 	s->matched_entry = NULL;
6691 	return NULL;
6692 }
6693 
6694 static int
6695 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6696 {
6697 	regmatch_t regmatch;
6698 
6699 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6700 	    0) == 0;
6701 }
6702 
6703 static const struct got_error *
6704 search_next_tree_view(struct tog_view *view)
6705 {
6706 	struct tog_tree_view_state *s = &view->state.tree;
6707 	struct got_tree_entry *te = NULL;
6708 
6709 	if (!view->searching) {
6710 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6711 		return NULL;
6712 	}
6713 
6714 	if (s->matched_entry) {
6715 		if (view->searching == TOG_SEARCH_FORWARD) {
6716 			if (s->selected_entry)
6717 				te = got_tree_entry_get_next(s->tree,
6718 				    s->selected_entry);
6719 			else
6720 				te = got_object_tree_get_first_entry(s->tree);
6721 		} else {
6722 			if (s->selected_entry == NULL)
6723 				te = got_object_tree_get_last_entry(s->tree);
6724 			else
6725 				te = got_tree_entry_get_prev(s->tree,
6726 				    s->selected_entry);
6727 		}
6728 	} else {
6729 		if (s->selected_entry)
6730 			te = s->selected_entry;
6731 		else if (view->searching == TOG_SEARCH_FORWARD)
6732 			te = got_object_tree_get_first_entry(s->tree);
6733 		else
6734 			te = got_object_tree_get_last_entry(s->tree);
6735 	}
6736 
6737 	while (1) {
6738 		if (te == NULL) {
6739 			if (s->matched_entry == NULL) {
6740 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6741 				return NULL;
6742 			}
6743 			if (view->searching == TOG_SEARCH_FORWARD)
6744 				te = got_object_tree_get_first_entry(s->tree);
6745 			else
6746 				te = got_object_tree_get_last_entry(s->tree);
6747 		}
6748 
6749 		if (match_tree_entry(te, &view->regex)) {
6750 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6751 			s->matched_entry = te;
6752 			break;
6753 		}
6754 
6755 		if (view->searching == TOG_SEARCH_FORWARD)
6756 			te = got_tree_entry_get_next(s->tree, te);
6757 		else
6758 			te = got_tree_entry_get_prev(s->tree, te);
6759 	}
6760 
6761 	if (s->matched_entry) {
6762 		s->first_displayed_entry = s->matched_entry;
6763 		s->selected = 0;
6764 	}
6765 
6766 	return NULL;
6767 }
6768 
6769 static const struct got_error *
6770 show_tree_view(struct tog_view *view)
6771 {
6772 	const struct got_error *err = NULL;
6773 	struct tog_tree_view_state *s = &view->state.tree;
6774 	char *parent_path;
6775 
6776 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6777 	if (err)
6778 		return err;
6779 
6780 	err = draw_tree_entries(view, parent_path);
6781 	free(parent_path);
6782 
6783 	view_border(view);
6784 	return err;
6785 }
6786 
6787 static const struct got_error *
6788 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6789 {
6790 	const struct got_error *err = NULL;
6791 	struct tog_tree_view_state *s = &view->state.tree;
6792 	struct tog_view *log_view, *ref_view;
6793 	struct got_tree_entry *te;
6794 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6795 
6796 	switch (ch) {
6797 	case 'i':
6798 		s->show_ids = !s->show_ids;
6799 		view->count = 0;
6800 		break;
6801 	case 'l':
6802 		view->count = 0;
6803 		if (!s->selected_entry)
6804 			break;
6805 		if (view_is_parent_view(view))
6806 			view_get_split(view, &begin_y, &begin_x);
6807 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6808 		if (view_is_parent_view(view) &&
6809 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6810 			err = view_init_hsplit(view, begin_y);
6811 			if (err)
6812 				break;
6813 		}
6814 		view->focussed = 0;
6815 		log_view->focussed = 1;
6816 		log_view->mode = view->mode;
6817 		log_view->nlines = view->lines - begin_y;
6818 		if (view_is_parent_view(view)) {
6819 			view_transfer_size(log_view, view);
6820 			err = view_close_child(view);
6821 			if (err)
6822 				return err;
6823 			err = view_set_child(view, log_view);
6824 			if (err)
6825 				return err;
6826 			view->focus_child = 1;
6827 		} else
6828 			*new_view = log_view;
6829 		break;
6830 	case 'r':
6831 		view->count = 0;
6832 		if (view_is_parent_view(view))
6833 			view_get_split(view, &begin_y, &begin_x);
6834 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6835 		if (ref_view == NULL)
6836 			return got_error_from_errno("view_open");
6837 		err = open_ref_view(ref_view, s->repo);
6838 		if (err) {
6839 			view_close(ref_view);
6840 			return err;
6841 		}
6842 		if (view_is_parent_view(view) &&
6843 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6844 			err = view_init_hsplit(view, begin_y);
6845 			if (err)
6846 				break;
6847 		}
6848 		view->focussed = 0;
6849 		ref_view->focussed = 1;
6850 		ref_view->mode = view->mode;
6851 		ref_view->nlines = view->lines - begin_y;
6852 		if (view_is_parent_view(view)) {
6853 			view_transfer_size(ref_view, view);
6854 			err = view_close_child(view);
6855 			if (err)
6856 				return err;
6857 			err = view_set_child(view, ref_view);
6858 			if (err)
6859 				return err;
6860 			view->focus_child = 1;
6861 		} else
6862 			*new_view = ref_view;
6863 		break;
6864 	case 'g':
6865 	case KEY_HOME:
6866 		s->selected = 0;
6867 		view->count = 0;
6868 		if (s->tree == s->root)
6869 			s->first_displayed_entry =
6870 			    got_object_tree_get_first_entry(s->tree);
6871 		else
6872 			s->first_displayed_entry = NULL;
6873 		break;
6874 	case 'G':
6875 	case KEY_END: {
6876 		int eos = view->nlines - 3;
6877 
6878 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6879 			--eos;  /* border */
6880 		s->selected = 0;
6881 		view->count = 0;
6882 		te = got_object_tree_get_last_entry(s->tree);
6883 		for (n = 0; n < eos; n++) {
6884 			if (te == NULL) {
6885 				if (s->tree != s->root) {
6886 					s->first_displayed_entry = NULL;
6887 					n++;
6888 				}
6889 				break;
6890 			}
6891 			s->first_displayed_entry = te;
6892 			te = got_tree_entry_get_prev(s->tree, te);
6893 		}
6894 		if (n > 0)
6895 			s->selected = n - 1;
6896 		break;
6897 	}
6898 	case 'k':
6899 	case KEY_UP:
6900 	case CTRL('p'):
6901 		if (s->selected > 0) {
6902 			s->selected--;
6903 			break;
6904 		}
6905 		tree_scroll_up(s, 1);
6906 		if (s->selected_entry == NULL ||
6907 		    (s->tree == s->root && s->selected_entry ==
6908 		     got_object_tree_get_first_entry(s->tree)))
6909 			view->count = 0;
6910 		break;
6911 	case CTRL('u'):
6912 	case 'u':
6913 		nscroll /= 2;
6914 		/* FALL THROUGH */
6915 	case KEY_PPAGE:
6916 	case CTRL('b'):
6917 	case 'b':
6918 		if (s->tree == s->root) {
6919 			if (got_object_tree_get_first_entry(s->tree) ==
6920 			    s->first_displayed_entry)
6921 				s->selected -= MIN(s->selected, nscroll);
6922 		} else {
6923 			if (s->first_displayed_entry == NULL)
6924 				s->selected -= MIN(s->selected, nscroll);
6925 		}
6926 		tree_scroll_up(s, MAX(0, nscroll));
6927 		if (s->selected_entry == NULL ||
6928 		    (s->tree == s->root && s->selected_entry ==
6929 		     got_object_tree_get_first_entry(s->tree)))
6930 			view->count = 0;
6931 		break;
6932 	case 'j':
6933 	case KEY_DOWN:
6934 	case CTRL('n'):
6935 		if (s->selected < s->ndisplayed - 1) {
6936 			s->selected++;
6937 			break;
6938 		}
6939 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6940 		    == NULL) {
6941 			/* can't scroll any further */
6942 			view->count = 0;
6943 			break;
6944 		}
6945 		tree_scroll_down(view, 1);
6946 		break;
6947 	case CTRL('d'):
6948 	case 'd':
6949 		nscroll /= 2;
6950 		/* FALL THROUGH */
6951 	case KEY_NPAGE:
6952 	case CTRL('f'):
6953 	case 'f':
6954 	case ' ':
6955 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6956 		    == NULL) {
6957 			/* can't scroll any further; move cursor down */
6958 			if (s->selected < s->ndisplayed - 1)
6959 				s->selected += MIN(nscroll,
6960 				    s->ndisplayed - s->selected - 1);
6961 			else
6962 				view->count = 0;
6963 			break;
6964 		}
6965 		tree_scroll_down(view, nscroll);
6966 		break;
6967 	case KEY_ENTER:
6968 	case '\r':
6969 	case KEY_BACKSPACE:
6970 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6971 			struct tog_parent_tree *parent;
6972 			/* user selected '..' */
6973 			if (s->tree == s->root) {
6974 				view->count = 0;
6975 				break;
6976 			}
6977 			parent = TAILQ_FIRST(&s->parents);
6978 			TAILQ_REMOVE(&s->parents, parent,
6979 			    entry);
6980 			got_object_tree_close(s->tree);
6981 			s->tree = parent->tree;
6982 			s->first_displayed_entry =
6983 			    parent->first_displayed_entry;
6984 			s->selected_entry =
6985 			    parent->selected_entry;
6986 			s->selected = parent->selected;
6987 			if (s->selected > view->nlines - 3) {
6988 				err = offset_selection_down(view);
6989 				if (err)
6990 					break;
6991 			}
6992 			free(parent);
6993 		} else if (S_ISDIR(got_tree_entry_get_mode(
6994 		    s->selected_entry))) {
6995 			struct got_tree_object *subtree;
6996 			view->count = 0;
6997 			err = got_object_open_as_tree(&subtree, s->repo,
6998 			    got_tree_entry_get_id(s->selected_entry));
6999 			if (err)
7000 				break;
7001 			err = tree_view_visit_subtree(s, subtree);
7002 			if (err) {
7003 				got_object_tree_close(subtree);
7004 				break;
7005 			}
7006 		} else if (S_ISREG(got_tree_entry_get_mode(
7007 		    s->selected_entry))) {
7008 			struct tog_view *blame_view;
7009 			int begin_x = 0, begin_y = 0;
7010 
7011 			if (view_is_parent_view(view))
7012 				view_get_split(view, &begin_y, &begin_x);
7013 
7014 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
7015 			    s->selected_entry, &s->parents,
7016 			    s->commit_id, s->repo);
7017 			if (err)
7018 				break;
7019 
7020 			if (view_is_parent_view(view) &&
7021 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
7022 				err = view_init_hsplit(view, begin_y);
7023 				if (err)
7024 					break;
7025 			}
7026 
7027 			view->count = 0;
7028 			view->focussed = 0;
7029 			blame_view->focussed = 1;
7030 			blame_view->mode = view->mode;
7031 			blame_view->nlines = view->lines - begin_y;
7032 			if (view_is_parent_view(view)) {
7033 				view_transfer_size(blame_view, view);
7034 				err = view_close_child(view);
7035 				if (err)
7036 					return err;
7037 				err = view_set_child(view, blame_view);
7038 				if (err)
7039 					return err;
7040 				view->focus_child = 1;
7041 			} else
7042 				*new_view = blame_view;
7043 		}
7044 		break;
7045 	case KEY_RESIZE:
7046 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7047 			s->selected = view->nlines - 4;
7048 		view->count = 0;
7049 		break;
7050 	default:
7051 		view->count = 0;
7052 		break;
7053 	}
7054 
7055 	return err;
7056 }
7057 
7058 __dead static void
7059 usage_tree(void)
7060 {
7061 	endwin();
7062 	fprintf(stderr,
7063 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7064 	    getprogname());
7065 	exit(1);
7066 }
7067 
7068 static const struct got_error *
7069 cmd_tree(int argc, char *argv[])
7070 {
7071 	const struct got_error *error;
7072 	struct got_repository *repo = NULL;
7073 	struct got_worktree *worktree = NULL;
7074 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7075 	struct got_object_id *commit_id = NULL;
7076 	struct got_commit_object *commit = NULL;
7077 	const char *commit_id_arg = NULL;
7078 	char *label = NULL;
7079 	struct got_reference *ref = NULL;
7080 	const char *head_ref_name = NULL;
7081 	int ch;
7082 	struct tog_view *view;
7083 	int *pack_fds = NULL;
7084 
7085 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7086 		switch (ch) {
7087 		case 'c':
7088 			commit_id_arg = optarg;
7089 			break;
7090 		case 'r':
7091 			repo_path = realpath(optarg, NULL);
7092 			if (repo_path == NULL)
7093 				return got_error_from_errno2("realpath",
7094 				    optarg);
7095 			break;
7096 		default:
7097 			usage_tree();
7098 			/* NOTREACHED */
7099 		}
7100 	}
7101 
7102 	argc -= optind;
7103 	argv += optind;
7104 
7105 	if (argc > 1)
7106 		usage_tree();
7107 
7108 	error = got_repo_pack_fds_open(&pack_fds);
7109 	if (error != NULL)
7110 		goto done;
7111 
7112 	if (repo_path == NULL) {
7113 		cwd = getcwd(NULL, 0);
7114 		if (cwd == NULL)
7115 			return got_error_from_errno("getcwd");
7116 		error = got_worktree_open(&worktree, cwd);
7117 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7118 			goto done;
7119 		if (worktree)
7120 			repo_path =
7121 			    strdup(got_worktree_get_repo_path(worktree));
7122 		else
7123 			repo_path = strdup(cwd);
7124 		if (repo_path == NULL) {
7125 			error = got_error_from_errno("strdup");
7126 			goto done;
7127 		}
7128 	}
7129 
7130 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7131 	if (error != NULL)
7132 		goto done;
7133 
7134 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7135 	    repo, worktree);
7136 	if (error)
7137 		goto done;
7138 
7139 	init_curses();
7140 
7141 	error = apply_unveil(got_repo_get_path(repo), NULL);
7142 	if (error)
7143 		goto done;
7144 
7145 	error = tog_load_refs(repo, 0);
7146 	if (error)
7147 		goto done;
7148 
7149 	if (commit_id_arg == NULL) {
7150 		error = got_repo_match_object_id(&commit_id, &label,
7151 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7152 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7153 		if (error)
7154 			goto done;
7155 		head_ref_name = label;
7156 	} else {
7157 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7158 		if (error == NULL)
7159 			head_ref_name = got_ref_get_name(ref);
7160 		else if (error->code != GOT_ERR_NOT_REF)
7161 			goto done;
7162 		error = got_repo_match_object_id(&commit_id, NULL,
7163 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7164 		if (error)
7165 			goto done;
7166 	}
7167 
7168 	error = got_object_open_as_commit(&commit, repo, commit_id);
7169 	if (error)
7170 		goto done;
7171 
7172 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7173 	if (view == NULL) {
7174 		error = got_error_from_errno("view_open");
7175 		goto done;
7176 	}
7177 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7178 	if (error)
7179 		goto done;
7180 	if (!got_path_is_root_dir(in_repo_path)) {
7181 		error = tree_view_walk_path(&view->state.tree, commit,
7182 		    in_repo_path);
7183 		if (error)
7184 			goto done;
7185 	}
7186 
7187 	if (worktree) {
7188 		/* Release work tree lock. */
7189 		got_worktree_close(worktree);
7190 		worktree = NULL;
7191 	}
7192 	error = view_loop(view);
7193 done:
7194 	free(repo_path);
7195 	free(cwd);
7196 	free(commit_id);
7197 	free(label);
7198 	if (ref)
7199 		got_ref_close(ref);
7200 	if (repo) {
7201 		const struct got_error *close_err = got_repo_close(repo);
7202 		if (error == NULL)
7203 			error = close_err;
7204 	}
7205 	if (pack_fds) {
7206 		const struct got_error *pack_err =
7207 		    got_repo_pack_fds_close(pack_fds);
7208 		if (error == NULL)
7209 			error = pack_err;
7210 	}
7211 	tog_free_refs();
7212 	return error;
7213 }
7214 
7215 static const struct got_error *
7216 ref_view_load_refs(struct tog_ref_view_state *s)
7217 {
7218 	struct got_reflist_entry *sre;
7219 	struct tog_reflist_entry *re;
7220 
7221 	s->nrefs = 0;
7222 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7223 		if (strncmp(got_ref_get_name(sre->ref),
7224 		    "refs/got/", 9) == 0 &&
7225 		    strncmp(got_ref_get_name(sre->ref),
7226 		    "refs/got/backup/", 16) != 0)
7227 			continue;
7228 
7229 		re = malloc(sizeof(*re));
7230 		if (re == NULL)
7231 			return got_error_from_errno("malloc");
7232 
7233 		re->ref = got_ref_dup(sre->ref);
7234 		if (re->ref == NULL)
7235 			return got_error_from_errno("got_ref_dup");
7236 		re->idx = s->nrefs++;
7237 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7238 	}
7239 
7240 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7241 	return NULL;
7242 }
7243 
7244 static void
7245 ref_view_free_refs(struct tog_ref_view_state *s)
7246 {
7247 	struct tog_reflist_entry *re;
7248 
7249 	while (!TAILQ_EMPTY(&s->refs)) {
7250 		re = TAILQ_FIRST(&s->refs);
7251 		TAILQ_REMOVE(&s->refs, re, entry);
7252 		got_ref_close(re->ref);
7253 		free(re);
7254 	}
7255 }
7256 
7257 static const struct got_error *
7258 open_ref_view(struct tog_view *view, struct got_repository *repo)
7259 {
7260 	const struct got_error *err = NULL;
7261 	struct tog_ref_view_state *s = &view->state.ref;
7262 
7263 	s->selected_entry = 0;
7264 	s->repo = repo;
7265 
7266 	TAILQ_INIT(&s->refs);
7267 	STAILQ_INIT(&s->colors);
7268 
7269 	err = ref_view_load_refs(s);
7270 	if (err)
7271 		return err;
7272 
7273 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7274 		err = add_color(&s->colors, "^refs/heads/",
7275 		    TOG_COLOR_REFS_HEADS,
7276 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7277 		if (err)
7278 			goto done;
7279 
7280 		err = add_color(&s->colors, "^refs/tags/",
7281 		    TOG_COLOR_REFS_TAGS,
7282 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7283 		if (err)
7284 			goto done;
7285 
7286 		err = add_color(&s->colors, "^refs/remotes/",
7287 		    TOG_COLOR_REFS_REMOTES,
7288 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7289 		if (err)
7290 			goto done;
7291 
7292 		err = add_color(&s->colors, "^refs/got/backup/",
7293 		    TOG_COLOR_REFS_BACKUP,
7294 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7295 		if (err)
7296 			goto done;
7297 	}
7298 
7299 	view->show = show_ref_view;
7300 	view->input = input_ref_view;
7301 	view->close = close_ref_view;
7302 	view->search_start = search_start_ref_view;
7303 	view->search_next = search_next_ref_view;
7304 done:
7305 	if (err)
7306 		free_colors(&s->colors);
7307 	return err;
7308 }
7309 
7310 static const struct got_error *
7311 close_ref_view(struct tog_view *view)
7312 {
7313 	struct tog_ref_view_state *s = &view->state.ref;
7314 
7315 	ref_view_free_refs(s);
7316 	free_colors(&s->colors);
7317 
7318 	return NULL;
7319 }
7320 
7321 static const struct got_error *
7322 resolve_reflist_entry(struct got_object_id **commit_id,
7323     struct tog_reflist_entry *re, struct got_repository *repo)
7324 {
7325 	const struct got_error *err = NULL;
7326 	struct got_object_id *obj_id;
7327 	struct got_tag_object *tag = NULL;
7328 	int obj_type;
7329 
7330 	*commit_id = NULL;
7331 
7332 	err = got_ref_resolve(&obj_id, repo, re->ref);
7333 	if (err)
7334 		return err;
7335 
7336 	err = got_object_get_type(&obj_type, repo, obj_id);
7337 	if (err)
7338 		goto done;
7339 
7340 	switch (obj_type) {
7341 	case GOT_OBJ_TYPE_COMMIT:
7342 		*commit_id = obj_id;
7343 		break;
7344 	case GOT_OBJ_TYPE_TAG:
7345 		err = got_object_open_as_tag(&tag, repo, obj_id);
7346 		if (err)
7347 			goto done;
7348 		free(obj_id);
7349 		err = got_object_get_type(&obj_type, repo,
7350 		    got_object_tag_get_object_id(tag));
7351 		if (err)
7352 			goto done;
7353 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7354 			err = got_error(GOT_ERR_OBJ_TYPE);
7355 			goto done;
7356 		}
7357 		*commit_id = got_object_id_dup(
7358 		    got_object_tag_get_object_id(tag));
7359 		if (*commit_id == NULL) {
7360 			err = got_error_from_errno("got_object_id_dup");
7361 			goto done;
7362 		}
7363 		break;
7364 	default:
7365 		err = got_error(GOT_ERR_OBJ_TYPE);
7366 		break;
7367 	}
7368 
7369 done:
7370 	if (tag)
7371 		got_object_tag_close(tag);
7372 	if (err) {
7373 		free(*commit_id);
7374 		*commit_id = NULL;
7375 	}
7376 	return err;
7377 }
7378 
7379 static const struct got_error *
7380 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7381     struct tog_reflist_entry *re, struct got_repository *repo)
7382 {
7383 	struct tog_view *log_view;
7384 	const struct got_error *err = NULL;
7385 	struct got_object_id *commit_id = NULL;
7386 
7387 	*new_view = NULL;
7388 
7389 	err = resolve_reflist_entry(&commit_id, re, repo);
7390 	if (err) {
7391 		if (err->code != GOT_ERR_OBJ_TYPE)
7392 			return err;
7393 		else
7394 			return NULL;
7395 	}
7396 
7397 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7398 	if (log_view == NULL) {
7399 		err = got_error_from_errno("view_open");
7400 		goto done;
7401 	}
7402 
7403 	err = open_log_view(log_view, commit_id, repo,
7404 	    got_ref_get_name(re->ref), "", 0);
7405 done:
7406 	if (err)
7407 		view_close(log_view);
7408 	else
7409 		*new_view = log_view;
7410 	free(commit_id);
7411 	return err;
7412 }
7413 
7414 static void
7415 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7416 {
7417 	struct tog_reflist_entry *re;
7418 	int i = 0;
7419 
7420 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7421 		return;
7422 
7423 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7424 	while (i++ < maxscroll) {
7425 		if (re == NULL)
7426 			break;
7427 		s->first_displayed_entry = re;
7428 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7429 	}
7430 }
7431 
7432 static const struct got_error *
7433 ref_scroll_down(struct tog_view *view, int maxscroll)
7434 {
7435 	struct tog_ref_view_state *s = &view->state.ref;
7436 	struct tog_reflist_entry *next, *last;
7437 	int n = 0;
7438 
7439 	if (s->first_displayed_entry)
7440 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7441 	else
7442 		next = TAILQ_FIRST(&s->refs);
7443 
7444 	last = s->last_displayed_entry;
7445 	while (next && n++ < maxscroll) {
7446 		if (last)
7447 			last = TAILQ_NEXT(last, entry);
7448 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7449 			s->first_displayed_entry = next;
7450 			next = TAILQ_NEXT(next, entry);
7451 		}
7452 	}
7453 
7454 	return NULL;
7455 }
7456 
7457 static const struct got_error *
7458 search_start_ref_view(struct tog_view *view)
7459 {
7460 	struct tog_ref_view_state *s = &view->state.ref;
7461 
7462 	s->matched_entry = NULL;
7463 	return NULL;
7464 }
7465 
7466 static int
7467 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7468 {
7469 	regmatch_t regmatch;
7470 
7471 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7472 	    0) == 0;
7473 }
7474 
7475 static const struct got_error *
7476 search_next_ref_view(struct tog_view *view)
7477 {
7478 	struct tog_ref_view_state *s = &view->state.ref;
7479 	struct tog_reflist_entry *re = NULL;
7480 
7481 	if (!view->searching) {
7482 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7483 		return NULL;
7484 	}
7485 
7486 	if (s->matched_entry) {
7487 		if (view->searching == TOG_SEARCH_FORWARD) {
7488 			if (s->selected_entry)
7489 				re = TAILQ_NEXT(s->selected_entry, entry);
7490 			else
7491 				re = TAILQ_PREV(s->selected_entry,
7492 				    tog_reflist_head, entry);
7493 		} else {
7494 			if (s->selected_entry == NULL)
7495 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7496 			else
7497 				re = TAILQ_PREV(s->selected_entry,
7498 				    tog_reflist_head, entry);
7499 		}
7500 	} else {
7501 		if (s->selected_entry)
7502 			re = s->selected_entry;
7503 		else if (view->searching == TOG_SEARCH_FORWARD)
7504 			re = TAILQ_FIRST(&s->refs);
7505 		else
7506 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7507 	}
7508 
7509 	while (1) {
7510 		if (re == NULL) {
7511 			if (s->matched_entry == NULL) {
7512 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7513 				return NULL;
7514 			}
7515 			if (view->searching == TOG_SEARCH_FORWARD)
7516 				re = TAILQ_FIRST(&s->refs);
7517 			else
7518 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7519 		}
7520 
7521 		if (match_reflist_entry(re, &view->regex)) {
7522 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7523 			s->matched_entry = re;
7524 			break;
7525 		}
7526 
7527 		if (view->searching == TOG_SEARCH_FORWARD)
7528 			re = TAILQ_NEXT(re, entry);
7529 		else
7530 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7531 	}
7532 
7533 	if (s->matched_entry) {
7534 		s->first_displayed_entry = s->matched_entry;
7535 		s->selected = 0;
7536 	}
7537 
7538 	return NULL;
7539 }
7540 
7541 static const struct got_error *
7542 show_ref_view(struct tog_view *view)
7543 {
7544 	const struct got_error *err = NULL;
7545 	struct tog_ref_view_state *s = &view->state.ref;
7546 	struct tog_reflist_entry *re;
7547 	char *line = NULL;
7548 	wchar_t *wline;
7549 	struct tog_color *tc;
7550 	int width, n;
7551 	int limit = view->nlines;
7552 
7553 	werase(view->window);
7554 
7555 	s->ndisplayed = 0;
7556 	if (view_is_hsplit_top(view))
7557 		--limit;  /* border */
7558 
7559 	if (limit == 0)
7560 		return NULL;
7561 
7562 	re = s->first_displayed_entry;
7563 
7564 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7565 	    s->nrefs) == -1)
7566 		return got_error_from_errno("asprintf");
7567 
7568 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7569 	if (err) {
7570 		free(line);
7571 		return err;
7572 	}
7573 	if (view_needs_focus_indication(view))
7574 		wstandout(view->window);
7575 	waddwstr(view->window, wline);
7576 	if (view_needs_focus_indication(view))
7577 		wstandend(view->window);
7578 	free(wline);
7579 	wline = NULL;
7580 	free(line);
7581 	line = NULL;
7582 	if (width < view->ncols - 1)
7583 		waddch(view->window, '\n');
7584 	if (--limit <= 0)
7585 		return NULL;
7586 
7587 	n = 0;
7588 	while (re && limit > 0) {
7589 		char *line = NULL;
7590 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7591 
7592 		if (s->show_date) {
7593 			struct got_commit_object *ci;
7594 			struct got_tag_object *tag;
7595 			struct got_object_id *id;
7596 			struct tm tm;
7597 			time_t t;
7598 
7599 			err = got_ref_resolve(&id, s->repo, re->ref);
7600 			if (err)
7601 				return err;
7602 			err = got_object_open_as_tag(&tag, s->repo, id);
7603 			if (err) {
7604 				if (err->code != GOT_ERR_OBJ_TYPE) {
7605 					free(id);
7606 					return err;
7607 				}
7608 				err = got_object_open_as_commit(&ci, s->repo,
7609 				    id);
7610 				if (err) {
7611 					free(id);
7612 					return err;
7613 				}
7614 				t = got_object_commit_get_committer_time(ci);
7615 				got_object_commit_close(ci);
7616 			} else {
7617 				t = got_object_tag_get_tagger_time(tag);
7618 				got_object_tag_close(tag);
7619 			}
7620 			free(id);
7621 			if (gmtime_r(&t, &tm) == NULL)
7622 				return got_error_from_errno("gmtime_r");
7623 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7624 				return got_error(GOT_ERR_NO_SPACE);
7625 		}
7626 		if (got_ref_is_symbolic(re->ref)) {
7627 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7628 			    ymd : "", got_ref_get_name(re->ref),
7629 			    got_ref_get_symref_target(re->ref)) == -1)
7630 				return got_error_from_errno("asprintf");
7631 		} else if (s->show_ids) {
7632 			struct got_object_id *id;
7633 			char *id_str;
7634 			err = got_ref_resolve(&id, s->repo, re->ref);
7635 			if (err)
7636 				return err;
7637 			err = got_object_id_str(&id_str, id);
7638 			if (err) {
7639 				free(id);
7640 				return err;
7641 			}
7642 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7643 			    got_ref_get_name(re->ref), id_str) == -1) {
7644 				err = got_error_from_errno("asprintf");
7645 				free(id);
7646 				free(id_str);
7647 				return err;
7648 			}
7649 			free(id);
7650 			free(id_str);
7651 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7652 		    got_ref_get_name(re->ref)) == -1)
7653 			return got_error_from_errno("asprintf");
7654 
7655 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7656 		    0, 0);
7657 		if (err) {
7658 			free(line);
7659 			return err;
7660 		}
7661 		if (n == s->selected) {
7662 			if (view->focussed)
7663 				wstandout(view->window);
7664 			s->selected_entry = re;
7665 		}
7666 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7667 		if (tc)
7668 			wattr_on(view->window,
7669 			    COLOR_PAIR(tc->colorpair), NULL);
7670 		waddwstr(view->window, wline);
7671 		if (tc)
7672 			wattr_off(view->window,
7673 			    COLOR_PAIR(tc->colorpair), NULL);
7674 		if (width < view->ncols - 1)
7675 			waddch(view->window, '\n');
7676 		if (n == s->selected && view->focussed)
7677 			wstandend(view->window);
7678 		free(line);
7679 		free(wline);
7680 		wline = NULL;
7681 		n++;
7682 		s->ndisplayed++;
7683 		s->last_displayed_entry = re;
7684 
7685 		limit--;
7686 		re = TAILQ_NEXT(re, entry);
7687 	}
7688 
7689 	view_border(view);
7690 	return err;
7691 }
7692 
7693 static const struct got_error *
7694 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7695     struct tog_reflist_entry *re, struct got_repository *repo)
7696 {
7697 	const struct got_error *err = NULL;
7698 	struct got_object_id *commit_id = NULL;
7699 	struct tog_view *tree_view;
7700 
7701 	*new_view = NULL;
7702 
7703 	err = resolve_reflist_entry(&commit_id, re, repo);
7704 	if (err) {
7705 		if (err->code != GOT_ERR_OBJ_TYPE)
7706 			return err;
7707 		else
7708 			return NULL;
7709 	}
7710 
7711 
7712 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7713 	if (tree_view == NULL) {
7714 		err = got_error_from_errno("view_open");
7715 		goto done;
7716 	}
7717 
7718 	err = open_tree_view(tree_view, commit_id,
7719 	    got_ref_get_name(re->ref), repo);
7720 	if (err)
7721 		goto done;
7722 
7723 	*new_view = tree_view;
7724 done:
7725 	free(commit_id);
7726 	return err;
7727 }
7728 static const struct got_error *
7729 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7730 {
7731 	const struct got_error *err = NULL;
7732 	struct tog_ref_view_state *s = &view->state.ref;
7733 	struct tog_view *log_view, *tree_view;
7734 	struct tog_reflist_entry *re;
7735 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7736 
7737 	switch (ch) {
7738 	case 'i':
7739 		s->show_ids = !s->show_ids;
7740 		view->count = 0;
7741 		break;
7742 	case 'm':
7743 		s->show_date = !s->show_date;
7744 		view->count = 0;
7745 		break;
7746 	case 'o':
7747 		s->sort_by_date = !s->sort_by_date;
7748 		view->count = 0;
7749 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7750 		    got_ref_cmp_by_commit_timestamp_descending :
7751 		    tog_ref_cmp_by_name, s->repo);
7752 		if (err)
7753 			break;
7754 		got_reflist_object_id_map_free(tog_refs_idmap);
7755 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7756 		    &tog_refs, s->repo);
7757 		if (err)
7758 			break;
7759 		ref_view_free_refs(s);
7760 		err = ref_view_load_refs(s);
7761 		break;
7762 	case KEY_ENTER:
7763 	case '\r':
7764 		view->count = 0;
7765 		if (!s->selected_entry)
7766 			break;
7767 		if (view_is_parent_view(view))
7768 			view_get_split(view, &begin_y, &begin_x);
7769 
7770 		err = log_ref_entry(&log_view, begin_y, begin_x,
7771 		    s->selected_entry, s->repo);
7772 		if (err)
7773 			break;
7774 
7775 		if (view_is_parent_view(view) &&
7776 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7777 			err = view_init_hsplit(view, begin_y);
7778 			if (err)
7779 				break;
7780 		}
7781 
7782 		view->focussed = 0;
7783 		log_view->focussed = 1;
7784 		log_view->mode = view->mode;
7785 		log_view->nlines = view->lines - begin_y;
7786 		if (view_is_parent_view(view)) {
7787 			view_transfer_size(log_view, view);
7788 			err = view_close_child(view);
7789 			if (err)
7790 				return err;
7791 			err = view_set_child(view, log_view);
7792 			if (err)
7793 				return err;
7794 			view->focus_child = 1;
7795 		} else
7796 			*new_view = log_view;
7797 		break;
7798 	case 't':
7799 		view->count = 0;
7800 		if (!s->selected_entry)
7801 			break;
7802 		if (view_is_parent_view(view))
7803 			view_get_split(view, &begin_y, &begin_x);
7804 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7805 		    s->selected_entry, s->repo);
7806 		if (err || tree_view == NULL)
7807 			break;
7808 		if (view_is_parent_view(view) &&
7809 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7810 			err = view_init_hsplit(view, begin_y);
7811 			if (err)
7812 				break;
7813 		}
7814 		view->focussed = 0;
7815 		tree_view->focussed = 1;
7816 		tree_view->mode = view->mode;
7817 		tree_view->nlines = view->lines - begin_y;
7818 		if (view_is_parent_view(view)) {
7819 			view_transfer_size(tree_view, view);
7820 			err = view_close_child(view);
7821 			if (err)
7822 				return err;
7823 			err = view_set_child(view, tree_view);
7824 			if (err)
7825 				return err;
7826 			view->focus_child = 1;
7827 		} else
7828 			*new_view = tree_view;
7829 		break;
7830 	case 'g':
7831 	case KEY_HOME:
7832 		s->selected = 0;
7833 		view->count = 0;
7834 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7835 		break;
7836 	case 'G':
7837 	case KEY_END: {
7838 		int eos = view->nlines - 1;
7839 
7840 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7841 			--eos;  /* border */
7842 		s->selected = 0;
7843 		view->count = 0;
7844 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7845 		for (n = 0; n < eos; n++) {
7846 			if (re == NULL)
7847 				break;
7848 			s->first_displayed_entry = re;
7849 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7850 		}
7851 		if (n > 0)
7852 			s->selected = n - 1;
7853 		break;
7854 	}
7855 	case 'k':
7856 	case KEY_UP:
7857 	case CTRL('p'):
7858 		if (s->selected > 0) {
7859 			s->selected--;
7860 			break;
7861 		}
7862 		ref_scroll_up(s, 1);
7863 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7864 			view->count = 0;
7865 		break;
7866 	case CTRL('u'):
7867 	case 'u':
7868 		nscroll /= 2;
7869 		/* FALL THROUGH */
7870 	case KEY_PPAGE:
7871 	case CTRL('b'):
7872 	case 'b':
7873 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7874 			s->selected -= MIN(nscroll, s->selected);
7875 		ref_scroll_up(s, MAX(0, nscroll));
7876 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7877 			view->count = 0;
7878 		break;
7879 	case 'j':
7880 	case KEY_DOWN:
7881 	case CTRL('n'):
7882 		if (s->selected < s->ndisplayed - 1) {
7883 			s->selected++;
7884 			break;
7885 		}
7886 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7887 			/* can't scroll any further */
7888 			view->count = 0;
7889 			break;
7890 		}
7891 		ref_scroll_down(view, 1);
7892 		break;
7893 	case CTRL('d'):
7894 	case 'd':
7895 		nscroll /= 2;
7896 		/* FALL THROUGH */
7897 	case KEY_NPAGE:
7898 	case CTRL('f'):
7899 	case 'f':
7900 	case ' ':
7901 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7902 			/* can't scroll any further; move cursor down */
7903 			if (s->selected < s->ndisplayed - 1)
7904 				s->selected += MIN(nscroll,
7905 				    s->ndisplayed - s->selected - 1);
7906 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7907 				s->selected += s->ndisplayed - s->selected - 1;
7908 			view->count = 0;
7909 			break;
7910 		}
7911 		ref_scroll_down(view, nscroll);
7912 		break;
7913 	case CTRL('l'):
7914 		view->count = 0;
7915 		tog_free_refs();
7916 		err = tog_load_refs(s->repo, s->sort_by_date);
7917 		if (err)
7918 			break;
7919 		ref_view_free_refs(s);
7920 		err = ref_view_load_refs(s);
7921 		break;
7922 	case KEY_RESIZE:
7923 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7924 			s->selected = view->nlines - 2;
7925 		break;
7926 	default:
7927 		view->count = 0;
7928 		break;
7929 	}
7930 
7931 	return err;
7932 }
7933 
7934 __dead static void
7935 usage_ref(void)
7936 {
7937 	endwin();
7938 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7939 	    getprogname());
7940 	exit(1);
7941 }
7942 
7943 static const struct got_error *
7944 cmd_ref(int argc, char *argv[])
7945 {
7946 	const struct got_error *error;
7947 	struct got_repository *repo = NULL;
7948 	struct got_worktree *worktree = NULL;
7949 	char *cwd = NULL, *repo_path = NULL;
7950 	int ch;
7951 	struct tog_view *view;
7952 	int *pack_fds = NULL;
7953 
7954 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7955 		switch (ch) {
7956 		case 'r':
7957 			repo_path = realpath(optarg, NULL);
7958 			if (repo_path == NULL)
7959 				return got_error_from_errno2("realpath",
7960 				    optarg);
7961 			break;
7962 		default:
7963 			usage_ref();
7964 			/* NOTREACHED */
7965 		}
7966 	}
7967 
7968 	argc -= optind;
7969 	argv += optind;
7970 
7971 	if (argc > 1)
7972 		usage_ref();
7973 
7974 	error = got_repo_pack_fds_open(&pack_fds);
7975 	if (error != NULL)
7976 		goto done;
7977 
7978 	if (repo_path == NULL) {
7979 		cwd = getcwd(NULL, 0);
7980 		if (cwd == NULL)
7981 			return got_error_from_errno("getcwd");
7982 		error = got_worktree_open(&worktree, cwd);
7983 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7984 			goto done;
7985 		if (worktree)
7986 			repo_path =
7987 			    strdup(got_worktree_get_repo_path(worktree));
7988 		else
7989 			repo_path = strdup(cwd);
7990 		if (repo_path == NULL) {
7991 			error = got_error_from_errno("strdup");
7992 			goto done;
7993 		}
7994 	}
7995 
7996 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7997 	if (error != NULL)
7998 		goto done;
7999 
8000 	init_curses();
8001 
8002 	error = apply_unveil(got_repo_get_path(repo), NULL);
8003 	if (error)
8004 		goto done;
8005 
8006 	error = tog_load_refs(repo, 0);
8007 	if (error)
8008 		goto done;
8009 
8010 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8011 	if (view == NULL) {
8012 		error = got_error_from_errno("view_open");
8013 		goto done;
8014 	}
8015 
8016 	error = open_ref_view(view, repo);
8017 	if (error)
8018 		goto done;
8019 
8020 	if (worktree) {
8021 		/* Release work tree lock. */
8022 		got_worktree_close(worktree);
8023 		worktree = NULL;
8024 	}
8025 	error = view_loop(view);
8026 done:
8027 	free(repo_path);
8028 	free(cwd);
8029 	if (repo) {
8030 		const struct got_error *close_err = got_repo_close(repo);
8031 		if (close_err)
8032 			error = close_err;
8033 	}
8034 	if (pack_fds) {
8035 		const struct got_error *pack_err =
8036 		    got_repo_pack_fds_close(pack_fds);
8037 		if (error == NULL)
8038 			error = pack_err;
8039 	}
8040 	tog_free_refs();
8041 	return error;
8042 }
8043 
8044 /*
8045  * If view was scrolled down to move the selected line into view when opening a
8046  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8047  */
8048 static void
8049 offset_selection_up(struct tog_view *view)
8050 {
8051 	switch (view->type) {
8052 	case TOG_VIEW_BLAME: {
8053 		struct tog_blame_view_state *s = &view->state.blame;
8054 		if (s->first_displayed_line == 1) {
8055 			s->selected_line = MAX(s->selected_line - view->offset,
8056 			    1);
8057 			break;
8058 		}
8059 		if (s->first_displayed_line > view->offset)
8060 			s->first_displayed_line -= view->offset;
8061 		else
8062 			s->first_displayed_line = 1;
8063 		s->selected_line += view->offset;
8064 		break;
8065 	}
8066 	case TOG_VIEW_LOG:
8067 		log_scroll_up(&view->state.log, view->offset);
8068 		view->state.log.selected += view->offset;
8069 		break;
8070 	case TOG_VIEW_REF:
8071 		ref_scroll_up(&view->state.ref, view->offset);
8072 		view->state.ref.selected += view->offset;
8073 		break;
8074 	case TOG_VIEW_TREE:
8075 		tree_scroll_up(&view->state.tree, view->offset);
8076 		view->state.tree.selected += view->offset;
8077 		break;
8078 	default:
8079 		break;
8080 	}
8081 
8082 	view->offset = 0;
8083 }
8084 
8085 /*
8086  * If the selected line is in the section of screen covered by the bottom split,
8087  * scroll down offset lines to move it into view and index its new position.
8088  */
8089 static const struct got_error *
8090 offset_selection_down(struct tog_view *view)
8091 {
8092 	const struct got_error	*err = NULL;
8093 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8094 	int			*selected = NULL;
8095 	int			 header, offset;
8096 
8097 	switch (view->type) {
8098 	case TOG_VIEW_BLAME: {
8099 		struct tog_blame_view_state *s = &view->state.blame;
8100 		header = 3;
8101 		scrolld = NULL;
8102 		if (s->selected_line > view->nlines - header) {
8103 			offset = abs(view->nlines - s->selected_line - header);
8104 			s->first_displayed_line += offset;
8105 			s->selected_line -= offset;
8106 			view->offset = offset;
8107 		}
8108 		break;
8109 	}
8110 	case TOG_VIEW_LOG: {
8111 		struct tog_log_view_state *s = &view->state.log;
8112 		scrolld = &log_scroll_down;
8113 		header = view_is_parent_view(view) ? 3 : 2;
8114 		selected = &s->selected;
8115 		break;
8116 	}
8117 	case TOG_VIEW_REF: {
8118 		struct tog_ref_view_state *s = &view->state.ref;
8119 		scrolld = &ref_scroll_down;
8120 		header = 3;
8121 		selected = &s->selected;
8122 		break;
8123 	}
8124 	case TOG_VIEW_TREE: {
8125 		struct tog_tree_view_state *s = &view->state.tree;
8126 		scrolld = &tree_scroll_down;
8127 		header = 5;
8128 		selected = &s->selected;
8129 		break;
8130 	}
8131 	default:
8132 		selected = NULL;
8133 		scrolld = NULL;
8134 		header = 0;
8135 		break;
8136 	}
8137 
8138 	if (selected && *selected > view->nlines - header) {
8139 		offset = abs(view->nlines - *selected - header);
8140 		view->offset = offset;
8141 		if (scrolld && offset) {
8142 			err = scrolld(view, offset);
8143 			*selected -= offset;
8144 		}
8145 	}
8146 
8147 	return err;
8148 }
8149 
8150 static void
8151 list_commands(FILE *fp)
8152 {
8153 	size_t i;
8154 
8155 	fprintf(fp, "commands:");
8156 	for (i = 0; i < nitems(tog_commands); i++) {
8157 		const struct tog_cmd *cmd = &tog_commands[i];
8158 		fprintf(fp, " %s", cmd->name);
8159 	}
8160 	fputc('\n', fp);
8161 }
8162 
8163 __dead static void
8164 usage(int hflag, int status)
8165 {
8166 	FILE *fp = (status == 0) ? stdout : stderr;
8167 
8168 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8169 	    getprogname());
8170 	if (hflag) {
8171 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8172 		list_commands(fp);
8173 	}
8174 	exit(status);
8175 }
8176 
8177 static char **
8178 make_argv(int argc, ...)
8179 {
8180 	va_list ap;
8181 	char **argv;
8182 	int i;
8183 
8184 	va_start(ap, argc);
8185 
8186 	argv = calloc(argc, sizeof(char *));
8187 	if (argv == NULL)
8188 		err(1, "calloc");
8189 	for (i = 0; i < argc; i++) {
8190 		argv[i] = strdup(va_arg(ap, char *));
8191 		if (argv[i] == NULL)
8192 			err(1, "strdup");
8193 	}
8194 
8195 	va_end(ap);
8196 	return argv;
8197 }
8198 
8199 /*
8200  * Try to convert 'tog path' into a 'tog log path' command.
8201  * The user could simply have mistyped the command rather than knowingly
8202  * provided a path. So check whether argv[0] can in fact be resolved
8203  * to a path in the HEAD commit and print a special error if not.
8204  * This hack is for mpi@ <3
8205  */
8206 static const struct got_error *
8207 tog_log_with_path(int argc, char *argv[])
8208 {
8209 	const struct got_error *error = NULL, *close_err;
8210 	const struct tog_cmd *cmd = NULL;
8211 	struct got_repository *repo = NULL;
8212 	struct got_worktree *worktree = NULL;
8213 	struct got_object_id *commit_id = NULL, *id = NULL;
8214 	struct got_commit_object *commit = NULL;
8215 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8216 	char *commit_id_str = NULL, **cmd_argv = NULL;
8217 	int *pack_fds = NULL;
8218 
8219 	cwd = getcwd(NULL, 0);
8220 	if (cwd == NULL)
8221 		return got_error_from_errno("getcwd");
8222 
8223 	error = got_repo_pack_fds_open(&pack_fds);
8224 	if (error != NULL)
8225 		goto done;
8226 
8227 	error = got_worktree_open(&worktree, cwd);
8228 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8229 		goto done;
8230 
8231 	if (worktree)
8232 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8233 	else
8234 		repo_path = strdup(cwd);
8235 	if (repo_path == NULL) {
8236 		error = got_error_from_errno("strdup");
8237 		goto done;
8238 	}
8239 
8240 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8241 	if (error != NULL)
8242 		goto done;
8243 
8244 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8245 	    repo, worktree);
8246 	if (error)
8247 		goto done;
8248 
8249 	error = tog_load_refs(repo, 0);
8250 	if (error)
8251 		goto done;
8252 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8253 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8254 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8255 	if (error)
8256 		goto done;
8257 
8258 	if (worktree) {
8259 		got_worktree_close(worktree);
8260 		worktree = NULL;
8261 	}
8262 
8263 	error = got_object_open_as_commit(&commit, repo, commit_id);
8264 	if (error)
8265 		goto done;
8266 
8267 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8268 	if (error) {
8269 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8270 			goto done;
8271 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8272 		    getprogname(), argv[0]);
8273 		usage(1, 1);
8274 		/* not reached */
8275 	}
8276 
8277 	close_err = got_repo_close(repo);
8278 	if (error == NULL)
8279 		error = close_err;
8280 	repo = NULL;
8281 
8282 	error = got_object_id_str(&commit_id_str, commit_id);
8283 	if (error)
8284 		goto done;
8285 
8286 	cmd = &tog_commands[0]; /* log */
8287 	argc = 4;
8288 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8289 	error = cmd->cmd_main(argc, cmd_argv);
8290 done:
8291 	if (repo) {
8292 		close_err = got_repo_close(repo);
8293 		if (error == NULL)
8294 			error = close_err;
8295 	}
8296 	if (commit)
8297 		got_object_commit_close(commit);
8298 	if (worktree)
8299 		got_worktree_close(worktree);
8300 	if (pack_fds) {
8301 		const struct got_error *pack_err =
8302 		    got_repo_pack_fds_close(pack_fds);
8303 		if (error == NULL)
8304 			error = pack_err;
8305 	}
8306 	free(id);
8307 	free(commit_id_str);
8308 	free(commit_id);
8309 	free(cwd);
8310 	free(repo_path);
8311 	free(in_repo_path);
8312 	if (cmd_argv) {
8313 		int i;
8314 		for (i = 0; i < argc; i++)
8315 			free(cmd_argv[i]);
8316 		free(cmd_argv);
8317 	}
8318 	tog_free_refs();
8319 	return error;
8320 }
8321 
8322 int
8323 main(int argc, char *argv[])
8324 {
8325 	const struct got_error *error = NULL;
8326 	const struct tog_cmd *cmd = NULL;
8327 	int ch, hflag = 0, Vflag = 0;
8328 	char **cmd_argv = NULL;
8329 	static const struct option longopts[] = {
8330 	    { "version", no_argument, NULL, 'V' },
8331 	    { NULL, 0, NULL, 0}
8332 	};
8333 	char *diff_algo_str = NULL;
8334 
8335 	setlocale(LC_CTYPE, "");
8336 
8337 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8338 		switch (ch) {
8339 		case 'h':
8340 			hflag = 1;
8341 			break;
8342 		case 'V':
8343 			Vflag = 1;
8344 			break;
8345 		default:
8346 			usage(hflag, 1);
8347 			/* NOTREACHED */
8348 		}
8349 	}
8350 
8351 	argc -= optind;
8352 	argv += optind;
8353 	optind = 1;
8354 	optreset = 1;
8355 
8356 	if (Vflag) {
8357 		got_version_print_str();
8358 		return 0;
8359 	}
8360 
8361 #ifndef PROFILE
8362 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8363 	    NULL) == -1)
8364 		err(1, "pledge");
8365 #endif
8366 
8367 	if (argc == 0) {
8368 		if (hflag)
8369 			usage(hflag, 0);
8370 		/* Build an argument vector which runs a default command. */
8371 		cmd = &tog_commands[0];
8372 		argc = 1;
8373 		cmd_argv = make_argv(argc, cmd->name);
8374 	} else {
8375 		size_t i;
8376 
8377 		/* Did the user specify a command? */
8378 		for (i = 0; i < nitems(tog_commands); i++) {
8379 			if (strncmp(tog_commands[i].name, argv[0],
8380 			    strlen(argv[0])) == 0) {
8381 				cmd = &tog_commands[i];
8382 				break;
8383 			}
8384 		}
8385 	}
8386 
8387 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8388 	if (diff_algo_str) {
8389 		if (strcasecmp(diff_algo_str, "patience") == 0)
8390 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8391 		if (strcasecmp(diff_algo_str, "myers") == 0)
8392 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8393 	}
8394 
8395 	if (cmd == NULL) {
8396 		if (argc != 1)
8397 			usage(0, 1);
8398 		/* No command specified; try log with a path */
8399 		error = tog_log_with_path(argc, argv);
8400 	} else {
8401 		if (hflag)
8402 			cmd->cmd_usage();
8403 		else
8404 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8405 	}
8406 
8407 	endwin();
8408 	putchar('\n');
8409 	if (cmd_argv) {
8410 		int i;
8411 		for (i = 0; i < argc; i++)
8412 			free(cmd_argv[i]);
8413 		free(cmd_argv);
8414 	}
8415 
8416 	if (error && error->code != GOT_ERR_CANCELLED)
8417 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8418 	return 0;
8419 }