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 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 };
107 
108 enum tog_view_mode {
109 	TOG_VIEW_SPLIT_NONE,
110 	TOG_VIEW_SPLIT_VERT,
111 	TOG_VIEW_SPLIT_HRZN
112 };
113 
114 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
115 
116 #define TOG_EOF_STRING	"(END)"
117 
118 struct commit_queue_entry {
119 	TAILQ_ENTRY(commit_queue_entry) entry;
120 	struct got_object_id *id;
121 	struct got_commit_object *commit;
122 	int idx;
123 };
124 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
125 struct commit_queue {
126 	int ncommits;
127 	struct commit_queue_head head;
128 };
129 
130 struct tog_color {
131 	STAILQ_ENTRY(tog_color) entry;
132 	regex_t regex;
133 	short colorpair;
134 };
135 STAILQ_HEAD(tog_colors, tog_color);
136 
137 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
138 static struct got_reflist_object_id_map *tog_refs_idmap;
139 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
140 
141 static const struct got_error *
142 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
143     struct got_reference* re2)
144 {
145 	const char *name1 = got_ref_get_name(re1);
146 	const char *name2 = got_ref_get_name(re2);
147 	int isbackup1, isbackup2;
148 
149 	/* Sort backup refs towards the bottom of the list. */
150 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
151 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
152 	if (!isbackup1 && isbackup2) {
153 		*cmp = -1;
154 		return NULL;
155 	} else if (isbackup1 && !isbackup2) {
156 		*cmp = 1;
157 		return NULL;
158 	}
159 
160 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
161 	return NULL;
162 }
163 
164 static const struct got_error *
165 tog_load_refs(struct got_repository *repo, int sort_by_date)
166 {
167 	const struct got_error *err;
168 
169 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
170 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
171 	    repo);
172 	if (err)
173 		return err;
174 
175 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
176 	    repo);
177 }
178 
179 static void
180 tog_free_refs(void)
181 {
182 	if (tog_refs_idmap) {
183 		got_reflist_object_id_map_free(tog_refs_idmap);
184 		tog_refs_idmap = NULL;
185 	}
186 	got_ref_list_free(&tog_refs);
187 }
188 
189 static const struct got_error *
190 add_color(struct tog_colors *colors, const char *pattern,
191     int idx, short color)
192 {
193 	const struct got_error *err = NULL;
194 	struct tog_color *tc;
195 	int regerr = 0;
196 
197 	if (idx < 1 || idx > COLOR_PAIRS - 1)
198 		return NULL;
199 
200 	init_pair(idx, color, -1);
201 
202 	tc = calloc(1, sizeof(*tc));
203 	if (tc == NULL)
204 		return got_error_from_errno("calloc");
205 	regerr = regcomp(&tc->regex, pattern,
206 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
207 	if (regerr) {
208 		static char regerr_msg[512];
209 		static char err_msg[512];
210 		regerror(regerr, &tc->regex, regerr_msg,
211 		    sizeof(regerr_msg));
212 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
213 		    regerr_msg);
214 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
215 		free(tc);
216 		return err;
217 	}
218 	tc->colorpair = idx;
219 	STAILQ_INSERT_HEAD(colors, tc, entry);
220 	return NULL;
221 }
222 
223 static void
224 free_colors(struct tog_colors *colors)
225 {
226 	struct tog_color *tc;
227 
228 	while (!STAILQ_EMPTY(colors)) {
229 		tc = STAILQ_FIRST(colors);
230 		STAILQ_REMOVE_HEAD(colors, entry);
231 		regfree(&tc->regex);
232 		free(tc);
233 	}
234 }
235 
236 static struct tog_color *
237 get_color(struct tog_colors *colors, int colorpair)
238 {
239 	struct tog_color *tc = NULL;
240 
241 	STAILQ_FOREACH(tc, colors, entry) {
242 		if (tc->colorpair == colorpair)
243 			return tc;
244 	}
245 
246 	return NULL;
247 }
248 
249 static int
250 default_color_value(const char *envvar)
251 {
252 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
253 		return COLOR_MAGENTA;
254 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
255 		return COLOR_CYAN;
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
257 		return COLOR_YELLOW;
258 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
259 		return COLOR_GREEN;
260 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
261 		return COLOR_MAGENTA;
262 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
263 		return COLOR_MAGENTA;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
265 		return COLOR_CYAN;
266 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
267 		return COLOR_GREEN;
268 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
269 		return COLOR_GREEN;
270 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
271 		return COLOR_CYAN;
272 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
273 		return COLOR_YELLOW;
274 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
275 		return COLOR_GREEN;
276 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
279 		return COLOR_YELLOW;
280 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
281 		return COLOR_CYAN;
282 
283 	return -1;
284 }
285 
286 static int
287 get_color_value(const char *envvar)
288 {
289 	const char *val = getenv(envvar);
290 
291 	if (val == NULL)
292 		return default_color_value(envvar);
293 
294 	if (strcasecmp(val, "black") == 0)
295 		return COLOR_BLACK;
296 	if (strcasecmp(val, "red") == 0)
297 		return COLOR_RED;
298 	if (strcasecmp(val, "green") == 0)
299 		return COLOR_GREEN;
300 	if (strcasecmp(val, "yellow") == 0)
301 		return COLOR_YELLOW;
302 	if (strcasecmp(val, "blue") == 0)
303 		return COLOR_BLUE;
304 	if (strcasecmp(val, "magenta") == 0)
305 		return COLOR_MAGENTA;
306 	if (strcasecmp(val, "cyan") == 0)
307 		return COLOR_CYAN;
308 	if (strcasecmp(val, "white") == 0)
309 		return COLOR_WHITE;
310 	if (strcasecmp(val, "default") == 0)
311 		return -1;
312 
313 	return default_color_value(envvar);
314 }
315 
316 
317 struct tog_diff_view_state {
318 	struct got_object_id *id1, *id2;
319 	const char *label1, *label2;
320 	FILE *f, *f1, *f2;
321 	int fd1, fd2;
322 	int first_displayed_line;
323 	int last_displayed_line;
324 	int eof;
325 	int diff_context;
326 	int ignore_whitespace;
327 	int force_text_diff;
328 	struct got_repository *repo;
329 	struct tog_colors colors;
330 	size_t nlines;
331 	off_t *line_offsets;
332 	int matched_line;
333 	int selected_line;
334 
335 	/* passed from log or blame view; may be NULL */
336 	struct tog_view *parent_view;
337 };
338 
339 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
340 static volatile sig_atomic_t tog_thread_error;
341 
342 struct tog_log_thread_args {
343 	pthread_cond_t need_commits;
344 	pthread_cond_t commit_loaded;
345 	int commits_needed;
346 	int load_all;
347 	struct got_commit_graph *graph;
348 	struct commit_queue *commits;
349 	const char *in_repo_path;
350 	struct got_object_id *start_id;
351 	struct got_repository *repo;
352 	int *pack_fds;
353 	int log_complete;
354 	sig_atomic_t *quit;
355 	struct commit_queue_entry **first_displayed_entry;
356 	struct commit_queue_entry **selected_entry;
357 	int *searching;
358 	int *search_next_done;
359 	regex_t *regex;
360 };
361 
362 struct tog_log_view_state {
363 	struct commit_queue commits;
364 	struct commit_queue_entry *first_displayed_entry;
365 	struct commit_queue_entry *last_displayed_entry;
366 	struct commit_queue_entry *selected_entry;
367 	int selected;
368 	char *in_repo_path;
369 	char *head_ref_name;
370 	int log_branches;
371 	struct got_repository *repo;
372 	struct got_object_id *start_id;
373 	sig_atomic_t quit;
374 	pthread_t thread;
375 	struct tog_log_thread_args thread_args;
376 	struct commit_queue_entry *matched_entry;
377 	struct commit_queue_entry *search_entry;
378 	struct tog_colors colors;
379 };
380 
381 #define TOG_COLOR_DIFF_MINUS		1
382 #define TOG_COLOR_DIFF_PLUS		2
383 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
384 #define TOG_COLOR_DIFF_META		4
385 #define TOG_COLOR_TREE_SUBMODULE	5
386 #define TOG_COLOR_TREE_SYMLINK		6
387 #define TOG_COLOR_TREE_DIRECTORY	7
388 #define TOG_COLOR_TREE_EXECUTABLE	8
389 #define TOG_COLOR_COMMIT		9
390 #define TOG_COLOR_AUTHOR		10
391 #define TOG_COLOR_DATE			11
392 #define TOG_COLOR_REFS_HEADS		12
393 #define TOG_COLOR_REFS_TAGS		13
394 #define TOG_COLOR_REFS_REMOTES		14
395 #define TOG_COLOR_REFS_BACKUP		15
396 
397 struct tog_blame_cb_args {
398 	struct tog_blame_line *lines; /* one per line */
399 	int nlines;
400 
401 	struct tog_view *view;
402 	struct got_object_id *commit_id;
403 	int *quit;
404 };
405 
406 struct tog_blame_thread_args {
407 	const char *path;
408 	struct got_repository *repo;
409 	struct tog_blame_cb_args *cb_args;
410 	int *complete;
411 	got_cancel_cb cancel_cb;
412 	void *cancel_arg;
413 };
414 
415 struct tog_blame {
416 	FILE *f;
417 	off_t filesize;
418 	struct tog_blame_line *lines;
419 	int nlines;
420 	off_t *line_offsets;
421 	pthread_t thread;
422 	struct tog_blame_thread_args thread_args;
423 	struct tog_blame_cb_args cb_args;
424 	const char *path;
425 	int *pack_fds;
426 };
427 
428 struct tog_blame_view_state {
429 	int first_displayed_line;
430 	int last_displayed_line;
431 	int selected_line;
432 	int last_diffed_line;
433 	int blame_complete;
434 	int eof;
435 	int done;
436 	struct got_object_id_queue blamed_commits;
437 	struct got_object_qid *blamed_commit;
438 	char *path;
439 	struct got_repository *repo;
440 	struct got_object_id *commit_id;
441 	struct tog_blame blame;
442 	int matched_line;
443 	struct tog_colors colors;
444 };
445 
446 struct tog_parent_tree {
447 	TAILQ_ENTRY(tog_parent_tree) entry;
448 	struct got_tree_object *tree;
449 	struct got_tree_entry *first_displayed_entry;
450 	struct got_tree_entry *selected_entry;
451 	int selected;
452 };
453 
454 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
455 
456 struct tog_tree_view_state {
457 	char *tree_label;
458 	struct got_object_id *commit_id;/* commit which this tree belongs to */
459 	struct got_tree_object *root;	/* the commit's root tree entry */
460 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
461 	struct got_tree_entry *first_displayed_entry;
462 	struct got_tree_entry *last_displayed_entry;
463 	struct got_tree_entry *selected_entry;
464 	int ndisplayed, selected, show_ids;
465 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
466 	char *head_ref_name;
467 	struct got_repository *repo;
468 	struct got_tree_entry *matched_entry;
469 	struct tog_colors colors;
470 };
471 
472 struct tog_reflist_entry {
473 	TAILQ_ENTRY(tog_reflist_entry) entry;
474 	struct got_reference *ref;
475 	int idx;
476 };
477 
478 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
479 
480 struct tog_ref_view_state {
481 	struct tog_reflist_head refs;
482 	struct tog_reflist_entry *first_displayed_entry;
483 	struct tog_reflist_entry *last_displayed_entry;
484 	struct tog_reflist_entry *selected_entry;
485 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
486 	struct got_repository *repo;
487 	struct tog_reflist_entry *matched_entry;
488 	struct tog_colors colors;
489 };
490 
491 /*
492  * We implement two types of views: parent views and child views.
493  *
494  * The 'Tab' key switches focus between a parent view and its child view.
495  * Child views are shown side-by-side to their parent view, provided
496  * there is enough screen estate.
497  *
498  * When a new view is opened from within a parent view, this new view
499  * becomes a child view of the parent view, replacing any existing child.
500  *
501  * When a new view is opened from within a child view, this new view
502  * becomes a parent view which will obscure the views below until the
503  * user quits the new parent view by typing 'q'.
504  *
505  * This list of views contains parent views only.
506  * Child views are only pointed to by their parent view.
507  */
508 TAILQ_HEAD(tog_view_list_head, tog_view);
509 
510 struct tog_view {
511 	TAILQ_ENTRY(tog_view) entry;
512 	WINDOW *window;
513 	PANEL *panel;
514 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
515 	int resized_y, resized_x; /* begin_y/x based on user resizing */
516 	int maxx, x; /* max column and current start column */
517 	int lines, cols; /* copies of LINES and COLS */
518 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
519 	int ch, count; /* current keymap and count prefix */
520 	int resize; /* set when in a resize event */
521 	int focussed; /* Only set on one parent or child view at a time. */
522 	int dying;
523 	struct tog_view *parent;
524 	struct tog_view *child;
525 
526 	/*
527 	 * This flag is initially set on parent views when a new child view
528 	 * is created. It gets toggled when the 'Tab' key switches focus
529 	 * between parent and child.
530 	 * The flag indicates whether focus should be passed on to our child
531 	 * view if this parent view gets picked for focus after another parent
532 	 * view was closed. This prevents child views from losing focus in such
533 	 * situations.
534 	 */
535 	int focus_child;
536 
537 	enum tog_view_mode mode;
538 	/* type-specific state */
539 	enum tog_view_type type;
540 	union {
541 		struct tog_diff_view_state diff;
542 		struct tog_log_view_state log;
543 		struct tog_blame_view_state blame;
544 		struct tog_tree_view_state tree;
545 		struct tog_ref_view_state ref;
546 	} state;
547 
548 	const struct got_error *(*show)(struct tog_view *);
549 	const struct got_error *(*input)(struct tog_view **,
550 	    struct tog_view *, int);
551 	const struct got_error *(*reset)(struct tog_view *);
552 	const struct got_error *(*close)(struct tog_view *);
553 
554 	const struct got_error *(*search_start)(struct tog_view *);
555 	const struct got_error *(*search_next)(struct tog_view *);
556 	int search_started;
557 	int searching;
558 #define TOG_SEARCH_FORWARD	1
559 #define TOG_SEARCH_BACKWARD	2
560 	int search_next_done;
561 #define TOG_SEARCH_HAVE_MORE	1
562 #define TOG_SEARCH_NO_MORE	2
563 #define TOG_SEARCH_HAVE_NONE	3
564 	regex_t regex;
565 	regmatch_t regmatch;
566 };
567 
568 static const struct got_error *open_diff_view(struct tog_view *,
569     struct got_object_id *, struct got_object_id *,
570     const char *, const char *, int, int, int, struct tog_view *,
571     struct got_repository *);
572 static const struct got_error *show_diff_view(struct tog_view *);
573 static const struct got_error *input_diff_view(struct tog_view **,
574     struct tog_view *, int);
575 static const struct got_error *reset_diff_view(struct tog_view *);
576 static const struct got_error* close_diff_view(struct tog_view *);
577 static const struct got_error *search_start_diff_view(struct tog_view *);
578 static const struct got_error *search_next_diff_view(struct tog_view *);
579 
580 static const struct got_error *open_log_view(struct tog_view *,
581     struct got_object_id *, struct got_repository *,
582     const char *, const char *, int);
583 static const struct got_error * show_log_view(struct tog_view *);
584 static const struct got_error *input_log_view(struct tog_view **,
585     struct tog_view *, int);
586 static const struct got_error *close_log_view(struct tog_view *);
587 static const struct got_error *search_start_log_view(struct tog_view *);
588 static const struct got_error *search_next_log_view(struct tog_view *);
589 
590 static const struct got_error *open_blame_view(struct tog_view *, char *,
591     struct got_object_id *, struct got_repository *);
592 static const struct got_error *show_blame_view(struct tog_view *);
593 static const struct got_error *input_blame_view(struct tog_view **,
594     struct tog_view *, int);
595 static const struct got_error *reset_blame_view(struct tog_view *);
596 static const struct got_error *close_blame_view(struct tog_view *);
597 static const struct got_error *search_start_blame_view(struct tog_view *);
598 static const struct got_error *search_next_blame_view(struct tog_view *);
599 
600 static const struct got_error *open_tree_view(struct tog_view *,
601     struct got_object_id *, const char *, struct got_repository *);
602 static const struct got_error *show_tree_view(struct tog_view *);
603 static const struct got_error *input_tree_view(struct tog_view **,
604     struct tog_view *, int);
605 static const struct got_error *close_tree_view(struct tog_view *);
606 static const struct got_error *search_start_tree_view(struct tog_view *);
607 static const struct got_error *search_next_tree_view(struct tog_view *);
608 
609 static const struct got_error *open_ref_view(struct tog_view *,
610     struct got_repository *);
611 static const struct got_error *show_ref_view(struct tog_view *);
612 static const struct got_error *input_ref_view(struct tog_view **,
613     struct tog_view *, int);
614 static const struct got_error *close_ref_view(struct tog_view *);
615 static const struct got_error *search_start_ref_view(struct tog_view *);
616 static const struct got_error *search_next_ref_view(struct tog_view *);
617 
618 static volatile sig_atomic_t tog_sigwinch_received;
619 static volatile sig_atomic_t tog_sigpipe_received;
620 static volatile sig_atomic_t tog_sigcont_received;
621 static volatile sig_atomic_t tog_sigint_received;
622 static volatile sig_atomic_t tog_sigterm_received;
623 
624 static void
625 tog_sigwinch(int signo)
626 {
627 	tog_sigwinch_received = 1;
628 }
629 
630 static void
631 tog_sigpipe(int signo)
632 {
633 	tog_sigpipe_received = 1;
634 }
635 
636 static void
637 tog_sigcont(int signo)
638 {
639 	tog_sigcont_received = 1;
640 }
641 
642 static void
643 tog_sigint(int signo)
644 {
645 	tog_sigint_received = 1;
646 }
647 
648 static void
649 tog_sigterm(int signo)
650 {
651 	tog_sigterm_received = 1;
652 }
653 
654 static int
655 tog_fatal_signal_received(void)
656 {
657 	return (tog_sigpipe_received ||
658 	    tog_sigint_received || tog_sigint_received);
659 }
660 
661 static const struct got_error *
662 view_close(struct tog_view *view)
663 {
664 	const struct got_error *err = NULL, *child_err = NULL;
665 
666 	if (view->child) {
667 		child_err = view_close(view->child);
668 		view->child = NULL;
669 	}
670 	if (view->close)
671 		err = view->close(view);
672 	if (view->panel)
673 		del_panel(view->panel);
674 	if (view->window)
675 		delwin(view->window);
676 	free(view);
677 	return err ? err : child_err;
678 }
679 
680 static struct tog_view *
681 view_open(int nlines, int ncols, int begin_y, int begin_x,
682     enum tog_view_type type)
683 {
684 	struct tog_view *view = calloc(1, sizeof(*view));
685 
686 	if (view == NULL)
687 		return NULL;
688 
689 	view->type = type;
690 	view->lines = LINES;
691 	view->cols = COLS;
692 	view->nlines = nlines ? nlines : LINES - begin_y;
693 	view->ncols = ncols ? ncols : COLS - begin_x;
694 	view->begin_y = begin_y;
695 	view->begin_x = begin_x;
696 	view->window = newwin(nlines, ncols, begin_y, begin_x);
697 	if (view->window == NULL) {
698 		view_close(view);
699 		return NULL;
700 	}
701 	view->panel = new_panel(view->window);
702 	if (view->panel == NULL ||
703 	    set_panel_userptr(view->panel, view) != OK) {
704 		view_close(view);
705 		return NULL;
706 	}
707 
708 	keypad(view->window, TRUE);
709 	return view;
710 }
711 
712 static int
713 view_split_begin_x(int begin_x)
714 {
715 	if (begin_x > 0 || COLS < 120)
716 		return 0;
717 	return (COLS - MAX(COLS / 2, 80));
718 }
719 
720 /* XXX Stub till we decide what to do. */
721 static int
722 view_split_begin_y(int lines)
723 {
724 	return lines * HSPLIT_SCALE;
725 }
726 
727 static const struct got_error *view_resize(struct tog_view *);
728 
729 static const struct got_error *
730 view_splitscreen(struct tog_view *view)
731 {
732 	const struct got_error *err = NULL;
733 
734 	if (!view->resize && view->mode == TOG_VIEW_SPLIT_HRZN) {
735 		if (view->resized_y && view->resized_y < view->lines)
736 			view->begin_y = view->resized_y;
737 		else
738 			view->begin_y = view_split_begin_y(view->nlines);
739 		view->begin_x = 0;
740 	} else if (!view->resize) {
741 		if (view->resized_x && view->resized_x < view->cols - 1 &&
742 		    view->cols > 119)
743 			view->begin_x = view->resized_x;
744 		else
745 			view->begin_x = view_split_begin_x(0);
746 		view->begin_y = 0;
747 	}
748 	view->nlines = LINES - view->begin_y;
749 	view->ncols = COLS - view->begin_x;
750 	view->lines = LINES;
751 	view->cols = COLS;
752 	err = view_resize(view);
753 	if (err)
754 		return err;
755 
756 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
757 		view->parent->nlines = view->begin_y;
758 
759 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
760 		return got_error_from_errno("mvwin");
761 
762 	return NULL;
763 }
764 
765 static const struct got_error *
766 view_fullscreen(struct tog_view *view)
767 {
768 	const struct got_error *err = NULL;
769 
770 	view->begin_x = 0;
771 	view->begin_y = view->resize ? view->begin_y : 0;
772 	view->nlines = view->resize ? view->nlines : LINES;
773 	view->ncols = COLS;
774 	view->lines = LINES;
775 	view->cols = COLS;
776 	err = view_resize(view);
777 	if (err)
778 		return err;
779 
780 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
781 		return got_error_from_errno("mvwin");
782 
783 	return NULL;
784 }
785 
786 static int
787 view_is_parent_view(struct tog_view *view)
788 {
789 	return view->parent == NULL;
790 }
791 
792 static int
793 view_is_splitscreen(struct tog_view *view)
794 {
795 	return view->begin_x > 0 || view->begin_y > 0;
796 }
797 
798 static int
799 view_is_fullscreen(struct tog_view *view)
800 {
801 	return view->nlines == LINES && view->ncols == COLS;
802 }
803 
804 static int
805 view_is_hsplit_top(struct tog_view *view)
806 {
807 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
808 	    view_is_splitscreen(view->child);
809 }
810 
811 static void
812 view_border(struct tog_view *view)
813 {
814 	PANEL *panel;
815 	const struct tog_view *view_above;
816 
817 	if (view->parent)
818 		return view_border(view->parent);
819 
820 	panel = panel_above(view->panel);
821 	if (panel == NULL)
822 		return;
823 
824 	view_above = panel_userptr(panel);
825 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
826 		mvwhline(view->window, view_above->begin_y - 1,
827 		    view->begin_x, got_locale_is_utf8() ?
828 		    ACS_HLINE : '-', view->ncols);
829 	else
830 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
831 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
832 }
833 
834 static const struct got_error *view_init_hsplit(struct tog_view *, int);
835 static const struct got_error *request_log_commits(struct tog_view *);
836 static const struct got_error *offset_selection_down(struct tog_view *);
837 static void offset_selection_up(struct tog_view *);
838 static void view_get_split(struct tog_view *, int *, int *);
839 
840 static const struct got_error *
841 view_resize(struct tog_view *view)
842 {
843 	const struct got_error	*err = NULL;
844 	int			 dif, nlines, ncols;
845 
846 	dif = LINES - view->lines;  /* line difference */
847 
848 	if (view->lines > LINES)
849 		nlines = view->nlines - (view->lines - LINES);
850 	else
851 		nlines = view->nlines + (LINES - view->lines);
852 	if (view->cols > COLS)
853 		ncols = view->ncols - (view->cols - COLS);
854 	else
855 		ncols = view->ncols + (COLS - view->cols);
856 
857 	if (view->child) {
858 		int hs = view->child->begin_y;
859 
860 		if (!view_is_fullscreen(view))
861 			view->child->begin_x = view_split_begin_x(view->begin_x);
862 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
863 		    view->child->begin_x == 0) {
864 			ncols = COLS;
865 
866 			view_fullscreen(view->child);
867 			if (view->child->focussed)
868 				show_panel(view->child->panel);
869 			else
870 				show_panel(view->panel);
871 		} else {
872 			ncols = view->child->begin_x;
873 
874 			view_splitscreen(view->child);
875 			show_panel(view->child->panel);
876 		}
877 		/*
878 		 * Request commits if terminal height was increased in a log
879 		 * view so we have enough commits loaded to populate the view.
880 		 */
881 		if (view->type == TOG_VIEW_LOG && dif > 0) {
882 			struct tog_log_view_state *ts = &view->state.log;
883 
884 			if (ts->commits.ncommits < ts->selected_entry->idx +
885 			    view->lines - ts->selected) {
886 				view->nscrolled = ts->selected_entry->idx +
887 				    view->lines - ts->selected -
888 				    ts->commits.ncommits + dif;
889 				err = request_log_commits(view);
890 				if (err)
891 					return err;
892 			}
893 		}
894 
895 		/*
896 		 * XXX This is ugly and needs to be moved into the above
897 		 * logic but "works" for now and my attempts at moving it
898 		 * break either 'tab' or 'F' key maps in horizontal splits.
899 		 */
900 		if (hs) {
901 			err = view_splitscreen(view->child);
902 			if (err)
903 				return err;
904 			if (dif < 0) { /* top split decreased */
905 				err = offset_selection_down(view);
906 				if (err)
907 					return err;
908 			}
909 			view_border(view);
910 			update_panels();
911 			doupdate();
912 			show_panel(view->child->panel);
913 			nlines = view->nlines;
914 		}
915 	} else if (view->parent == NULL)
916 		ncols = COLS;
917 
918 	if (wresize(view->window, nlines, ncols) == ERR)
919 		return got_error_from_errno("wresize");
920 	if (replace_panel(view->panel, view->window) == ERR)
921 		return got_error_from_errno("replace_panel");
922 	wclear(view->window);
923 
924 	view->nlines = nlines;
925 	view->ncols = ncols;
926 	view->lines = LINES;
927 	view->cols = COLS;
928 
929 	return NULL;
930 }
931 
932 static void
933 view_adjust_offset(struct tog_view *view, int n)
934 {
935 	if (n == 0)
936 		return;
937 
938 	if (view->parent && view->parent->offset) {
939 		if (view->parent->offset + n >= 0)
940 			view->parent->offset += n;
941 		else
942 			view->parent->offset = 0;
943 	} else if (view->offset) {
944 		if (view->offset - n >= 0)
945 			view->offset -= n;
946 		else
947 			view->offset = 0;
948 	}
949 }
950 
951 static const struct got_error *
952 view_resize_split(struct tog_view *view, int resize)
953 {
954 	const struct got_error	*err = NULL;
955 	struct tog_view		*v = NULL;
956 
957 	if (view->parent)
958 		v = view->parent;
959 	else
960 		v = view;
961 
962 	if (!v->child || !view_is_splitscreen(v->child))
963 		return NULL;
964 
965 	v->resize = v->child->resize = resize;  /* lock for resize event */
966 
967 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
968 		int y = v->child->begin_y;
969 
970 		if (v->child->resized_y)
971 			v->child->begin_y = v->child->resized_y;
972 		if (view->parent)
973 			v->child->begin_y -= resize;
974 		else
975 			v->child->begin_y += resize;
976 		if (v->child->begin_y < 3) {
977 			view->count = 0;
978 			v->child->begin_y = 3;
979 		} else if (v->child->begin_y > LINES - 1) {
980 			view->count = 0;
981 			v->child->begin_y = LINES - 1;
982 		}
983 		v->ncols = COLS;
984 		v->child->ncols = COLS;
985 		view_adjust_offset(view, resize);
986 		err = view_init_hsplit(v, v->child->begin_y);
987 		if (err)
988 			return err;
989 		v->child->resized_y = v->child->begin_y;
990 		if (y > v->child->begin_y && v->child->type == TOG_VIEW_LOG)
991 			v->child->nscrolled = y - v->child->begin_y;
992 		else if (y < v->child->begin_y && v->type == TOG_VIEW_LOG)
993 			v->nscrolled = v->child->begin_y - y;
994 	} else {
995 		if (v->child->resized_x)
996 			v->child->begin_x = v->child->resized_x;
997 		if (view->parent)
998 			v->child->begin_x -= resize;
999 		else
1000 			v->child->begin_x += resize;
1001 		if (v->child->begin_x < 11) {
1002 			view->count = 0;
1003 			v->child->begin_x = 11;
1004 		} else if (v->child->begin_x > COLS - 1) {
1005 			view->count = 0;
1006 			v->child->begin_x = COLS - 1;
1007 		}
1008 		v->child->resized_x = v->child->begin_x;
1009 	}
1010 
1011 	v->child->mode = v->mode;
1012 	v->child->nlines = v->lines - v->child->begin_y;
1013 	v->child->ncols = v->cols - v->child->begin_x;
1014 	v->focus_child = 1;
1015 
1016 	err = view_fullscreen(v);
1017 	if (err)
1018 		return err;
1019 	err = view_splitscreen(v->child);
1020 	if (err)
1021 		return err;
1022 
1023 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1024 		err = offset_selection_down(v->child);
1025 		if (err)
1026 			return err;
1027 	}
1028 
1029 	if (v->nscrolled)
1030 		err = request_log_commits(v);
1031 	else if (v->child->nscrolled)
1032 		err = request_log_commits(v->child);
1033 
1034 	v->resize = v->child->resize = 0;
1035 
1036 	return err;
1037 }
1038 
1039 static void
1040 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1041 {
1042 	struct tog_view *v = src->child ? src->child : src;
1043 
1044 	dst->resized_x = v->resized_x;
1045 	dst->resized_y = v->resized_y;
1046 }
1047 
1048 static const struct got_error *
1049 view_close_child(struct tog_view *view)
1050 {
1051 	const struct got_error *err = NULL;
1052 
1053 	if (view->child == NULL)
1054 		return NULL;
1055 
1056 	err = view_close(view->child);
1057 	view->child = NULL;
1058 	return err;
1059 }
1060 
1061 static const struct got_error *
1062 view_set_child(struct tog_view *view, struct tog_view *child)
1063 {
1064 	const struct got_error *err = NULL;
1065 
1066 	view->child = child;
1067 	child->parent = view;
1068 
1069 	err = view_resize(view);
1070 	if (err)
1071 		return err;
1072 
1073 	if (view->child->resized_x || view->child->resized_y)
1074 		err = view_resize_split(view, 0);
1075 
1076 	return err;
1077 }
1078 
1079 static void
1080 tog_resizeterm(void)
1081 {
1082 	int cols, lines;
1083 	struct winsize size;
1084 
1085 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1086 		cols = 80;     /* Default */
1087 		lines = 24;
1088 	} else {
1089 		cols = size.ws_col;
1090 		lines = size.ws_row;
1091 	}
1092 	resize_term(lines, cols);
1093 }
1094 
1095 static const struct got_error *
1096 view_search_start(struct tog_view *view)
1097 {
1098 	const struct got_error *err = NULL;
1099 	struct tog_view *v = view;
1100 	char pattern[1024];
1101 	int ret;
1102 
1103 	if (view->search_started) {
1104 		regfree(&view->regex);
1105 		view->searching = 0;
1106 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1107 	}
1108 	view->search_started = 0;
1109 
1110 	if (view->nlines < 1)
1111 		return NULL;
1112 
1113 	if (view_is_hsplit_top(view))
1114 		v = view->child;
1115 
1116 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1117 	wclrtoeol(v->window);
1118 
1119 	nodelay(view->window, FALSE);  /* block for search term input */
1120 	nocbreak();
1121 	echo();
1122 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1123 	wrefresh(v->window);
1124 	cbreak();
1125 	noecho();
1126 	nodelay(view->window, TRUE);
1127 	if (ret == ERR)
1128 		return NULL;
1129 
1130 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1131 		err = view->search_start(view);
1132 		if (err) {
1133 			regfree(&view->regex);
1134 			return err;
1135 		}
1136 		view->search_started = 1;
1137 		view->searching = TOG_SEARCH_FORWARD;
1138 		view->search_next_done = 0;
1139 		view->search_next(view);
1140 	}
1141 
1142 	return NULL;
1143 }
1144 
1145 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1146 static const struct got_error *
1147 switch_split(struct tog_view *view)
1148 {
1149 	const struct got_error	*err = NULL;
1150 	struct tog_view		*v = NULL;
1151 
1152 	if (view->parent)
1153 		v = view->parent;
1154 	else
1155 		v = view;
1156 
1157 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1158 		v->mode = TOG_VIEW_SPLIT_VERT;
1159 	else
1160 		v->mode = TOG_VIEW_SPLIT_HRZN;
1161 
1162 	if (!v->child)
1163 		return NULL;
1164 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1165 		v->mode = TOG_VIEW_SPLIT_NONE;
1166 
1167 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1168 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1169 		v->child->begin_y = v->child->resized_y;
1170 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1171 		v->child->begin_x = v->child->resized_x;
1172 
1173 
1174 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1175 		v->ncols = COLS;
1176 		v->child->ncols = COLS;
1177 		v->child->nscrolled = LINES - v->child->nlines;
1178 
1179 		err = view_init_hsplit(v, v->child->begin_y);
1180 		if (err)
1181 			return err;
1182 	}
1183 	v->child->mode = v->mode;
1184 	v->child->nlines = v->lines - v->child->begin_y;
1185 	v->focus_child = 1;
1186 
1187 	err = view_fullscreen(v);
1188 	if (err)
1189 		return err;
1190 	err = view_splitscreen(v->child);
1191 	if (err)
1192 		return err;
1193 
1194 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1195 		v->mode = TOG_VIEW_SPLIT_VERT;
1196 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1197 		err = offset_selection_down(v);
1198 		err = offset_selection_down(v->child);
1199 	} else {
1200 		offset_selection_up(v);
1201 		offset_selection_up(v->child);
1202 	}
1203 	if (v->type == TOG_VIEW_LOG && v->nscrolled)
1204 		err = request_log_commits(v);
1205 	else if (v->child->type == TOG_VIEW_LOG && v->child->nscrolled)
1206 		err = request_log_commits(v->child);
1207 
1208 	return err;
1209 }
1210 
1211 /*
1212  * Compute view->count from numeric input. Assign total to view->count and
1213  * return first non-numeric key entered.
1214  */
1215 static int
1216 get_compound_key(struct tog_view *view, int c)
1217 {
1218 	struct tog_view	*v = view;
1219 	int		 x, n = 0;
1220 
1221 	if (view_is_hsplit_top(view))
1222 		v = view->child;
1223 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1224 		v = view->parent;
1225 
1226 	view->count = 0;
1227 	cbreak();  /* block for input */
1228 	wmove(v->window, v->nlines - 1, 0);
1229 	wclrtoeol(v->window);
1230 	waddch(v->window, ':');
1231 
1232 	do {
1233 		x = getcurx(v->window);
1234 		if (x != ERR && x < view->ncols) {
1235 			waddch(v->window, c);
1236 			wrefresh(v->window);
1237 		}
1238 
1239 		/*
1240 		 * Don't overflow. Max valid request should be the greatest
1241 		 * between the longest and total lines; cap at 10 million.
1242 		 */
1243 		if (n >= 9999999)
1244 			n = 9999999;
1245 		else
1246 			n = n * 10 + (c - '0');
1247 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1248 
1249 	/* Massage excessive or inapplicable values at the input handler. */
1250 	view->count = n;
1251 
1252 	return c;
1253 }
1254 
1255 static const struct got_error *
1256 view_input(struct tog_view **new, int *done, struct tog_view *view,
1257     struct tog_view_list_head *views)
1258 {
1259 	const struct got_error *err = NULL;
1260 	struct tog_view *v;
1261 	int ch, errcode;
1262 
1263 	*new = NULL;
1264 
1265 	/* Clear "no matches" indicator. */
1266 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1267 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1268 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1269 		view->count = 0;
1270 	}
1271 
1272 	if (view->searching && !view->search_next_done) {
1273 		errcode = pthread_mutex_unlock(&tog_mutex);
1274 		if (errcode)
1275 			return got_error_set_errno(errcode,
1276 			    "pthread_mutex_unlock");
1277 		sched_yield();
1278 		errcode = pthread_mutex_lock(&tog_mutex);
1279 		if (errcode)
1280 			return got_error_set_errno(errcode,
1281 			    "pthread_mutex_lock");
1282 		view->search_next(view);
1283 		return NULL;
1284 	}
1285 
1286 	nodelay(view->window, FALSE);
1287 	/* Allow threads to make progress while we are waiting for input. */
1288 	errcode = pthread_mutex_unlock(&tog_mutex);
1289 	if (errcode)
1290 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1291 	/* If we have an unfinished count, let C-g or backspace abort. */
1292 	if (view->count && --view->count) {
1293 		cbreak();
1294 		nodelay(view->window, TRUE);
1295 		ch = wgetch(view->window);
1296 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1297 			view->count = 0;
1298 		else
1299 			ch = view->ch;
1300 	} else {
1301 		ch = wgetch(view->window);
1302 		if (ch >= '1' && ch  <= '9')
1303 			view->ch = ch = get_compound_key(view, ch);
1304 	}
1305 	errcode = pthread_mutex_lock(&tog_mutex);
1306 	if (errcode)
1307 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1308 	nodelay(view->window, TRUE);
1309 
1310 	if (tog_sigwinch_received || tog_sigcont_received) {
1311 		tog_resizeterm();
1312 		tog_sigwinch_received = 0;
1313 		tog_sigcont_received = 0;
1314 		TAILQ_FOREACH(v, views, entry) {
1315 			err = view_resize(v);
1316 			if (err)
1317 				return err;
1318 			err = v->input(new, v, KEY_RESIZE);
1319 			if (err)
1320 				return err;
1321 			if (v->child) {
1322 				err = view_resize(v->child);
1323 				if (err)
1324 					return err;
1325 				err = v->child->input(new, v->child,
1326 				    KEY_RESIZE);
1327 				if (err)
1328 					return err;
1329 				if (v->child->resized_x || v->child->resized_y) {
1330 					err = view_resize_split(v, 0);
1331 					if (err)
1332 						return err;
1333 				}
1334 			}
1335 		}
1336 	}
1337 
1338 	switch (ch) {
1339 	case '\t':
1340 		view->count = 0;
1341 		if (view->child) {
1342 			view->focussed = 0;
1343 			view->child->focussed = 1;
1344 			view->focus_child = 1;
1345 		} else if (view->parent) {
1346 			view->focussed = 0;
1347 			view->parent->focussed = 1;
1348 			view->parent->focus_child = 0;
1349 			if (!view_is_splitscreen(view)) {
1350 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1351 				    view->parent->type == TOG_VIEW_LOG) {
1352 					err = request_log_commits(view->parent);
1353 					if (err)
1354 						return err;
1355 				}
1356 				offset_selection_up(view->parent);
1357 				err = view_fullscreen(view->parent);
1358 				if (err)
1359 					return err;
1360 			}
1361 		}
1362 		break;
1363 	case 'q':
1364 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1365 			if (view->parent->type == TOG_VIEW_LOG) {
1366 				/* might need more commits to fill fullscreen */
1367 				err = request_log_commits(view->parent);
1368 				if (err)
1369 					break;
1370 			}
1371 			offset_selection_up(view->parent);
1372 		}
1373 		err = view->input(new, view, ch);
1374 		view->dying = 1;
1375 		break;
1376 	case 'Q':
1377 		*done = 1;
1378 		break;
1379 	case 'F':
1380 		view->count = 0;
1381 		if (view_is_parent_view(view)) {
1382 			if (view->child == NULL)
1383 				break;
1384 			if (view_is_splitscreen(view->child)) {
1385 				view->focussed = 0;
1386 				view->child->focussed = 1;
1387 				err = view_fullscreen(view->child);
1388 			} else {
1389 				err = view_splitscreen(view->child);
1390 				if (!err)
1391 					err = view_resize_split(view, 0);
1392 			}
1393 			if (err)
1394 				break;
1395 			err = view->child->input(new, view->child,
1396 			    KEY_RESIZE);
1397 		} else {
1398 			if (view_is_splitscreen(view)) {
1399 				view->parent->focussed = 0;
1400 				view->focussed = 1;
1401 				err = view_fullscreen(view);
1402 			} else {
1403 				err = view_splitscreen(view);
1404 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1405 					err = view_resize(view->parent);
1406 				if (!err)
1407 					err = view_resize_split(view, 0);
1408 			}
1409 			if (err)
1410 				break;
1411 			err = view->input(new, view, KEY_RESIZE);
1412 		}
1413 		if (err)
1414 			break;
1415 		if (view->type == TOG_VIEW_LOG) {
1416 			err = request_log_commits(view);
1417 			if (err)
1418 				break;
1419 		}
1420 		if (view->parent)
1421 			err = offset_selection_down(view->parent);
1422 		if (!err)
1423 			err = offset_selection_down(view);
1424 		break;
1425 	case 'S':
1426 		view->count = 0;
1427 		err = switch_split(view);
1428 		break;
1429 	case '-':
1430 		err = view_resize_split(view, -1);
1431 		break;
1432 	case '+':
1433 		err = view_resize_split(view, 1);
1434 		break;
1435 	case KEY_RESIZE:
1436 		break;
1437 	case '/':
1438 		view->count = 0;
1439 		if (view->search_start)
1440 			view_search_start(view);
1441 		else
1442 			err = view->input(new, view, ch);
1443 		break;
1444 	case 'N':
1445 	case 'n':
1446 		if (view->search_started && view->search_next) {
1447 			view->searching = (ch == 'n' ?
1448 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1449 			view->search_next_done = 0;
1450 			view->search_next(view);
1451 		} else
1452 			err = view->input(new, view, ch);
1453 		break;
1454 	case 'A':
1455 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1456 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1457 		else
1458 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1459 		TAILQ_FOREACH(v, views, entry) {
1460 			if (v->reset) {
1461 				err = v->reset(v);
1462 				if (err)
1463 					return err;
1464 			}
1465 			if (v->child && v->child->reset) {
1466 				err = v->child->reset(v->child);
1467 				if (err)
1468 					return err;
1469 			}
1470 		}
1471 		break;
1472 	default:
1473 		err = view->input(new, view, ch);
1474 		break;
1475 	}
1476 
1477 	return err;
1478 }
1479 
1480 static int
1481 view_needs_focus_indication(struct tog_view *view)
1482 {
1483 	if (view_is_parent_view(view)) {
1484 		if (view->child == NULL || view->child->focussed)
1485 			return 0;
1486 		if (!view_is_splitscreen(view->child))
1487 			return 0;
1488 	} else if (!view_is_splitscreen(view))
1489 		return 0;
1490 
1491 	return view->focussed;
1492 }
1493 
1494 static const struct got_error *
1495 view_loop(struct tog_view *view)
1496 {
1497 	const struct got_error *err = NULL;
1498 	struct tog_view_list_head views;
1499 	struct tog_view *new_view;
1500 	char *mode;
1501 	int fast_refresh = 10;
1502 	int done = 0, errcode;
1503 
1504 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1505 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1506 		view->mode = TOG_VIEW_SPLIT_VERT;
1507 	else
1508 		view->mode = TOG_VIEW_SPLIT_HRZN;
1509 
1510 	errcode = pthread_mutex_lock(&tog_mutex);
1511 	if (errcode)
1512 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1513 
1514 	TAILQ_INIT(&views);
1515 	TAILQ_INSERT_HEAD(&views, view, entry);
1516 
1517 	view->focussed = 1;
1518 	err = view->show(view);
1519 	if (err)
1520 		return err;
1521 	update_panels();
1522 	doupdate();
1523 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1524 	    !tog_fatal_signal_received()) {
1525 		/* Refresh fast during initialization, then become slower. */
1526 		if (fast_refresh && fast_refresh-- == 0)
1527 			halfdelay(10); /* switch to once per second */
1528 
1529 		err = view_input(&new_view, &done, view, &views);
1530 		if (err)
1531 			break;
1532 		if (view->dying) {
1533 			struct tog_view *v, *prev = NULL;
1534 
1535 			if (view_is_parent_view(view))
1536 				prev = TAILQ_PREV(view, tog_view_list_head,
1537 				    entry);
1538 			else if (view->parent)
1539 				prev = view->parent;
1540 
1541 			if (view->parent) {
1542 				view->parent->child = NULL;
1543 				view->parent->focus_child = 0;
1544 				/* Restore fullscreen line height. */
1545 				view->parent->nlines = view->parent->lines;
1546 				err = view_resize(view->parent);
1547 				if (err)
1548 					break;
1549 				/* Make resized splits persist. */
1550 				view_transfer_size(view->parent, view);
1551 			} else
1552 				TAILQ_REMOVE(&views, view, entry);
1553 
1554 			err = view_close(view);
1555 			if (err)
1556 				goto done;
1557 
1558 			view = NULL;
1559 			TAILQ_FOREACH(v, &views, entry) {
1560 				if (v->focussed)
1561 					break;
1562 			}
1563 			if (view == NULL && new_view == NULL) {
1564 				/* No view has focus. Try to pick one. */
1565 				if (prev)
1566 					view = prev;
1567 				else if (!TAILQ_EMPTY(&views)) {
1568 					view = TAILQ_LAST(&views,
1569 					    tog_view_list_head);
1570 				}
1571 				if (view) {
1572 					if (view->focus_child) {
1573 						view->child->focussed = 1;
1574 						view = view->child;
1575 					} else
1576 						view->focussed = 1;
1577 				}
1578 			}
1579 		}
1580 		if (new_view) {
1581 			struct tog_view *v, *t;
1582 			/* Only allow one parent view per type. */
1583 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1584 				if (v->type != new_view->type)
1585 					continue;
1586 				TAILQ_REMOVE(&views, v, entry);
1587 				err = view_close(v);
1588 				if (err)
1589 					goto done;
1590 				break;
1591 			}
1592 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1593 			view = new_view;
1594 		}
1595 		if (view) {
1596 			if (view_is_parent_view(view)) {
1597 				if (view->child && view->child->focussed)
1598 					view = view->child;
1599 			} else {
1600 				if (view->parent && view->parent->focussed)
1601 					view = view->parent;
1602 			}
1603 			show_panel(view->panel);
1604 			if (view->child && view_is_splitscreen(view->child))
1605 				show_panel(view->child->panel);
1606 			if (view->parent && view_is_splitscreen(view)) {
1607 				err = view->parent->show(view->parent);
1608 				if (err)
1609 					goto done;
1610 			}
1611 			err = view->show(view);
1612 			if (err)
1613 				goto done;
1614 			if (view->child) {
1615 				err = view->child->show(view->child);
1616 				if (err)
1617 					goto done;
1618 			}
1619 			update_panels();
1620 			doupdate();
1621 		}
1622 	}
1623 done:
1624 	while (!TAILQ_EMPTY(&views)) {
1625 		const struct got_error *close_err;
1626 		view = TAILQ_FIRST(&views);
1627 		TAILQ_REMOVE(&views, view, entry);
1628 		close_err = view_close(view);
1629 		if (close_err && err == NULL)
1630 			err = close_err;
1631 	}
1632 
1633 	errcode = pthread_mutex_unlock(&tog_mutex);
1634 	if (errcode && err == NULL)
1635 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1636 
1637 	return err;
1638 }
1639 
1640 __dead static void
1641 usage_log(void)
1642 {
1643 	endwin();
1644 	fprintf(stderr,
1645 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1646 	    getprogname());
1647 	exit(1);
1648 }
1649 
1650 /* Create newly allocated wide-character string equivalent to a byte string. */
1651 static const struct got_error *
1652 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1653 {
1654 	char *vis = NULL;
1655 	const struct got_error *err = NULL;
1656 
1657 	*ws = NULL;
1658 	*wlen = mbstowcs(NULL, s, 0);
1659 	if (*wlen == (size_t)-1) {
1660 		int vislen;
1661 		if (errno != EILSEQ)
1662 			return got_error_from_errno("mbstowcs");
1663 
1664 		/* byte string invalid in current encoding; try to "fix" it */
1665 		err = got_mbsavis(&vis, &vislen, s);
1666 		if (err)
1667 			return err;
1668 		*wlen = mbstowcs(NULL, vis, 0);
1669 		if (*wlen == (size_t)-1) {
1670 			err = got_error_from_errno("mbstowcs"); /* give up */
1671 			goto done;
1672 		}
1673 	}
1674 
1675 	*ws = calloc(*wlen + 1, sizeof(**ws));
1676 	if (*ws == NULL) {
1677 		err = got_error_from_errno("calloc");
1678 		goto done;
1679 	}
1680 
1681 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1682 		err = got_error_from_errno("mbstowcs");
1683 done:
1684 	free(vis);
1685 	if (err) {
1686 		free(*ws);
1687 		*ws = NULL;
1688 		*wlen = 0;
1689 	}
1690 	return err;
1691 }
1692 
1693 static const struct got_error *
1694 expand_tab(char **ptr, const char *src)
1695 {
1696 	char	*dst;
1697 	size_t	 len, n, idx = 0, sz = 0;
1698 
1699 	*ptr = NULL;
1700 	n = len = strlen(src);
1701 	dst = malloc(n + 1);
1702 	if (dst == NULL)
1703 		return got_error_from_errno("malloc");
1704 
1705 	while (idx < len && src[idx]) {
1706 		const char c = src[idx];
1707 
1708 		if (c == '\t') {
1709 			size_t nb = TABSIZE - sz % TABSIZE;
1710 			char *p;
1711 
1712 			p = realloc(dst, n + nb);
1713 			if (p == NULL) {
1714 				free(dst);
1715 				return got_error_from_errno("realloc");
1716 
1717 			}
1718 			dst = p;
1719 			n += nb;
1720 			memset(dst + sz, ' ', nb);
1721 			sz += nb;
1722 		} else
1723 			dst[sz++] = src[idx];
1724 		++idx;
1725 	}
1726 
1727 	dst[sz] = '\0';
1728 	*ptr = dst;
1729 	return NULL;
1730 }
1731 
1732 /*
1733  * Advance at most n columns from wline starting at offset off.
1734  * Return the index to the first character after the span operation.
1735  * Return the combined column width of all spanned wide character in
1736  * *rcol.
1737  */
1738 static int
1739 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1740 {
1741 	int width, i, cols = 0;
1742 
1743 	if (n == 0) {
1744 		*rcol = cols;
1745 		return off;
1746 	}
1747 
1748 	for (i = off; wline[i] != L'\0'; ++i) {
1749 		if (wline[i] == L'\t')
1750 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1751 		else
1752 			width = wcwidth(wline[i]);
1753 
1754 		if (width == -1) {
1755 			width = 1;
1756 			wline[i] = L'.';
1757 		}
1758 
1759 		if (cols + width > n)
1760 			break;
1761 		cols += width;
1762 	}
1763 
1764 	*rcol = cols;
1765 	return i;
1766 }
1767 
1768 /*
1769  * Format a line for display, ensuring that it won't overflow a width limit.
1770  * With scrolling, the width returned refers to the scrolled version of the
1771  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1772  */
1773 static const struct got_error *
1774 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1775     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1776 {
1777 	const struct got_error *err = NULL;
1778 	int cols;
1779 	wchar_t *wline = NULL;
1780 	char *exstr = NULL;
1781 	size_t wlen;
1782 	int i, scrollx;
1783 
1784 	*wlinep = NULL;
1785 	*widthp = 0;
1786 
1787 	if (expand) {
1788 		err = expand_tab(&exstr, line);
1789 		if (err)
1790 			return err;
1791 	}
1792 
1793 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1794 	free(exstr);
1795 	if (err)
1796 		return err;
1797 
1798 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1799 
1800 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1801 		wline[wlen - 1] = L'\0';
1802 		wlen--;
1803 	}
1804 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1805 		wline[wlen - 1] = L'\0';
1806 		wlen--;
1807 	}
1808 
1809 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1810 	wline[i] = L'\0';
1811 
1812 	if (widthp)
1813 		*widthp = cols;
1814 	if (scrollxp)
1815 		*scrollxp = scrollx;
1816 	if (err)
1817 		free(wline);
1818 	else
1819 		*wlinep = wline;
1820 	return err;
1821 }
1822 
1823 static const struct got_error*
1824 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1825     struct got_object_id *id, struct got_repository *repo)
1826 {
1827 	static const struct got_error *err = NULL;
1828 	struct got_reflist_entry *re;
1829 	char *s;
1830 	const char *name;
1831 
1832 	*refs_str = NULL;
1833 
1834 	TAILQ_FOREACH(re, refs, entry) {
1835 		struct got_tag_object *tag = NULL;
1836 		struct got_object_id *ref_id;
1837 		int cmp;
1838 
1839 		name = got_ref_get_name(re->ref);
1840 		if (strcmp(name, GOT_REF_HEAD) == 0)
1841 			continue;
1842 		if (strncmp(name, "refs/", 5) == 0)
1843 			name += 5;
1844 		if (strncmp(name, "got/", 4) == 0 &&
1845 		    strncmp(name, "got/backup/", 11) != 0)
1846 			continue;
1847 		if (strncmp(name, "heads/", 6) == 0)
1848 			name += 6;
1849 		if (strncmp(name, "remotes/", 8) == 0) {
1850 			name += 8;
1851 			s = strstr(name, "/" GOT_REF_HEAD);
1852 			if (s != NULL && s[strlen(s)] == '\0')
1853 				continue;
1854 		}
1855 		err = got_ref_resolve(&ref_id, repo, re->ref);
1856 		if (err)
1857 			break;
1858 		if (strncmp(name, "tags/", 5) == 0) {
1859 			err = got_object_open_as_tag(&tag, repo, ref_id);
1860 			if (err) {
1861 				if (err->code != GOT_ERR_OBJ_TYPE) {
1862 					free(ref_id);
1863 					break;
1864 				}
1865 				/* Ref points at something other than a tag. */
1866 				err = NULL;
1867 				tag = NULL;
1868 			}
1869 		}
1870 		cmp = got_object_id_cmp(tag ?
1871 		    got_object_tag_get_object_id(tag) : ref_id, id);
1872 		free(ref_id);
1873 		if (tag)
1874 			got_object_tag_close(tag);
1875 		if (cmp != 0)
1876 			continue;
1877 		s = *refs_str;
1878 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1879 		    s ? ", " : "", name) == -1) {
1880 			err = got_error_from_errno("asprintf");
1881 			free(s);
1882 			*refs_str = NULL;
1883 			break;
1884 		}
1885 		free(s);
1886 	}
1887 
1888 	return err;
1889 }
1890 
1891 static const struct got_error *
1892 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1893     int col_tab_align)
1894 {
1895 	char *smallerthan;
1896 
1897 	smallerthan = strchr(author, '<');
1898 	if (smallerthan && smallerthan[1] != '\0')
1899 		author = smallerthan + 1;
1900 	author[strcspn(author, "@>")] = '\0';
1901 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1902 	    col_tab_align, 0);
1903 }
1904 
1905 static const struct got_error *
1906 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1907     struct got_object_id *id, const size_t date_display_cols,
1908     int author_display_cols)
1909 {
1910 	struct tog_log_view_state *s = &view->state.log;
1911 	const struct got_error *err = NULL;
1912 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1913 	char *logmsg0 = NULL, *logmsg = NULL;
1914 	char *author = NULL;
1915 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1916 	int author_width, logmsg_width;
1917 	char *newline, *line = NULL;
1918 	int col, limit, scrollx;
1919 	const int avail = view->ncols;
1920 	struct tm tm;
1921 	time_t committer_time;
1922 	struct tog_color *tc;
1923 
1924 	committer_time = got_object_commit_get_committer_time(commit);
1925 	if (gmtime_r(&committer_time, &tm) == NULL)
1926 		return got_error_from_errno("gmtime_r");
1927 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1928 		return got_error(GOT_ERR_NO_SPACE);
1929 
1930 	if (avail <= date_display_cols)
1931 		limit = MIN(sizeof(datebuf) - 1, avail);
1932 	else
1933 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1934 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1935 	if (tc)
1936 		wattr_on(view->window,
1937 		    COLOR_PAIR(tc->colorpair), NULL);
1938 	waddnstr(view->window, datebuf, limit);
1939 	if (tc)
1940 		wattr_off(view->window,
1941 		    COLOR_PAIR(tc->colorpair), NULL);
1942 	col = limit;
1943 	if (col > avail)
1944 		goto done;
1945 
1946 	if (avail >= 120) {
1947 		char *id_str;
1948 		err = got_object_id_str(&id_str, id);
1949 		if (err)
1950 			goto done;
1951 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1952 		if (tc)
1953 			wattr_on(view->window,
1954 			    COLOR_PAIR(tc->colorpair), NULL);
1955 		wprintw(view->window, "%.8s ", id_str);
1956 		if (tc)
1957 			wattr_off(view->window,
1958 			    COLOR_PAIR(tc->colorpair), NULL);
1959 		free(id_str);
1960 		col += 9;
1961 		if (col > avail)
1962 			goto done;
1963 	}
1964 
1965 	author = strdup(got_object_commit_get_author(commit));
1966 	if (author == NULL) {
1967 		err = got_error_from_errno("strdup");
1968 		goto done;
1969 	}
1970 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1971 	if (err)
1972 		goto done;
1973 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1974 	if (tc)
1975 		wattr_on(view->window,
1976 		    COLOR_PAIR(tc->colorpair), NULL);
1977 	waddwstr(view->window, wauthor);
1978 	if (tc)
1979 		wattr_off(view->window,
1980 		    COLOR_PAIR(tc->colorpair), NULL);
1981 	col += author_width;
1982 	while (col < avail && author_width < author_display_cols + 2) {
1983 		waddch(view->window, ' ');
1984 		col++;
1985 		author_width++;
1986 	}
1987 	if (col > avail)
1988 		goto done;
1989 
1990 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1991 	if (err)
1992 		goto done;
1993 	logmsg = logmsg0;
1994 	while (*logmsg == '\n')
1995 		logmsg++;
1996 	newline = strchr(logmsg, '\n');
1997 	if (newline)
1998 		*newline = '\0';
1999 	limit = avail - col;
2000 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2001 		limit--;	/* for the border */
2002 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2003 	    limit, col, 1);
2004 	if (err)
2005 		goto done;
2006 	waddwstr(view->window, &wlogmsg[scrollx]);
2007 	col += MAX(logmsg_width, 0);
2008 	while (col < avail) {
2009 		waddch(view->window, ' ');
2010 		col++;
2011 	}
2012 done:
2013 	free(logmsg0);
2014 	free(wlogmsg);
2015 	free(author);
2016 	free(wauthor);
2017 	free(line);
2018 	return err;
2019 }
2020 
2021 static struct commit_queue_entry *
2022 alloc_commit_queue_entry(struct got_commit_object *commit,
2023     struct got_object_id *id)
2024 {
2025 	struct commit_queue_entry *entry;
2026 
2027 	entry = calloc(1, sizeof(*entry));
2028 	if (entry == NULL)
2029 		return NULL;
2030 
2031 	entry->id = id;
2032 	entry->commit = commit;
2033 	return entry;
2034 }
2035 
2036 static void
2037 pop_commit(struct commit_queue *commits)
2038 {
2039 	struct commit_queue_entry *entry;
2040 
2041 	entry = TAILQ_FIRST(&commits->head);
2042 	TAILQ_REMOVE(&commits->head, entry, entry);
2043 	got_object_commit_close(entry->commit);
2044 	commits->ncommits--;
2045 	/* Don't free entry->id! It is owned by the commit graph. */
2046 	free(entry);
2047 }
2048 
2049 static void
2050 free_commits(struct commit_queue *commits)
2051 {
2052 	while (!TAILQ_EMPTY(&commits->head))
2053 		pop_commit(commits);
2054 }
2055 
2056 static const struct got_error *
2057 match_commit(int *have_match, struct got_object_id *id,
2058     struct got_commit_object *commit, regex_t *regex)
2059 {
2060 	const struct got_error *err = NULL;
2061 	regmatch_t regmatch;
2062 	char *id_str = NULL, *logmsg = NULL;
2063 
2064 	*have_match = 0;
2065 
2066 	err = got_object_id_str(&id_str, id);
2067 	if (err)
2068 		return err;
2069 
2070 	err = got_object_commit_get_logmsg(&logmsg, commit);
2071 	if (err)
2072 		goto done;
2073 
2074 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2075 	    &regmatch, 0) == 0 ||
2076 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2077 	    &regmatch, 0) == 0 ||
2078 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2079 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2080 		*have_match = 1;
2081 done:
2082 	free(id_str);
2083 	free(logmsg);
2084 	return err;
2085 }
2086 
2087 static const struct got_error *
2088 queue_commits(struct tog_log_thread_args *a)
2089 {
2090 	const struct got_error *err = NULL;
2091 
2092 	/*
2093 	 * We keep all commits open throughout the lifetime of the log
2094 	 * view in order to avoid having to re-fetch commits from disk
2095 	 * while updating the display.
2096 	 */
2097 	do {
2098 		struct got_object_id *id;
2099 		struct got_commit_object *commit;
2100 		struct commit_queue_entry *entry;
2101 		int errcode;
2102 
2103 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2104 		    NULL, NULL);
2105 		if (err || id == NULL)
2106 			break;
2107 
2108 		err = got_object_open_as_commit(&commit, a->repo, id);
2109 		if (err)
2110 			break;
2111 		entry = alloc_commit_queue_entry(commit, id);
2112 		if (entry == NULL) {
2113 			err = got_error_from_errno("alloc_commit_queue_entry");
2114 			break;
2115 		}
2116 
2117 		errcode = pthread_mutex_lock(&tog_mutex);
2118 		if (errcode) {
2119 			err = got_error_set_errno(errcode,
2120 			    "pthread_mutex_lock");
2121 			break;
2122 		}
2123 
2124 		entry->idx = a->commits->ncommits;
2125 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2126 		a->commits->ncommits++;
2127 
2128 		if (*a->searching == TOG_SEARCH_FORWARD &&
2129 		    !*a->search_next_done) {
2130 			int have_match;
2131 			err = match_commit(&have_match, id, commit, a->regex);
2132 			if (err)
2133 				break;
2134 			if (have_match)
2135 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2136 		}
2137 
2138 		errcode = pthread_mutex_unlock(&tog_mutex);
2139 		if (errcode && err == NULL)
2140 			err = got_error_set_errno(errcode,
2141 			    "pthread_mutex_unlock");
2142 		if (err)
2143 			break;
2144 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2145 
2146 	return err;
2147 }
2148 
2149 static void
2150 select_commit(struct tog_log_view_state *s)
2151 {
2152 	struct commit_queue_entry *entry;
2153 	int ncommits = 0;
2154 
2155 	entry = s->first_displayed_entry;
2156 	while (entry) {
2157 		if (ncommits == s->selected) {
2158 			s->selected_entry = entry;
2159 			break;
2160 		}
2161 		entry = TAILQ_NEXT(entry, entry);
2162 		ncommits++;
2163 	}
2164 }
2165 
2166 static const struct got_error *
2167 draw_commits(struct tog_view *view)
2168 {
2169 	const struct got_error *err = NULL;
2170 	struct tog_log_view_state *s = &view->state.log;
2171 	struct commit_queue_entry *entry = s->selected_entry;
2172 	const int limit = view->nlines;
2173 	int width;
2174 	int ncommits, author_cols = 4;
2175 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2176 	char *refs_str = NULL;
2177 	wchar_t *wline;
2178 	struct tog_color *tc;
2179 	static const size_t date_display_cols = 12;
2180 
2181 	if (s->selected_entry &&
2182 	    !(view->searching && view->search_next_done == 0)) {
2183 		struct got_reflist_head *refs;
2184 		err = got_object_id_str(&id_str, s->selected_entry->id);
2185 		if (err)
2186 			return err;
2187 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2188 		    s->selected_entry->id);
2189 		if (refs) {
2190 			err = build_refs_str(&refs_str, refs,
2191 			    s->selected_entry->id, s->repo);
2192 			if (err)
2193 				goto done;
2194 		}
2195 	}
2196 
2197 	if (s->thread_args.commits_needed == 0)
2198 		halfdelay(10); /* disable fast refresh */
2199 
2200 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2201 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2202 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2203 		    (view->searching && !view->search_next_done) ?
2204 		    "searching..." : "loading...") == -1) {
2205 			err = got_error_from_errno("asprintf");
2206 			goto done;
2207 		}
2208 	} else {
2209 		const char *search_str = NULL;
2210 
2211 		if (view->searching) {
2212 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2213 				search_str = "no more matches";
2214 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2215 				search_str = "no matches found";
2216 			else if (!view->search_next_done)
2217 				search_str = "searching...";
2218 		}
2219 
2220 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2221 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2222 		    search_str ? search_str :
2223 		    (refs_str ? refs_str : "")) == -1) {
2224 			err = got_error_from_errno("asprintf");
2225 			goto done;
2226 		}
2227 	}
2228 
2229 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2230 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2231 		    "........................................",
2232 		    s->in_repo_path, ncommits_str) == -1) {
2233 			err = got_error_from_errno("asprintf");
2234 			header = NULL;
2235 			goto done;
2236 		}
2237 	} else if (asprintf(&header, "commit %s%s",
2238 	    id_str ? id_str : "........................................",
2239 	    ncommits_str) == -1) {
2240 		err = got_error_from_errno("asprintf");
2241 		header = NULL;
2242 		goto done;
2243 	}
2244 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2245 	if (err)
2246 		goto done;
2247 
2248 	werase(view->window);
2249 
2250 	if (view_needs_focus_indication(view))
2251 		wstandout(view->window);
2252 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2253 	if (tc)
2254 		wattr_on(view->window,
2255 		    COLOR_PAIR(tc->colorpair), NULL);
2256 	waddwstr(view->window, wline);
2257 	if (tc)
2258 		wattr_off(view->window,
2259 		    COLOR_PAIR(tc->colorpair), NULL);
2260 	while (width < view->ncols) {
2261 		waddch(view->window, ' ');
2262 		width++;
2263 	}
2264 	if (view_needs_focus_indication(view))
2265 		wstandend(view->window);
2266 	free(wline);
2267 	if (limit <= 1)
2268 		goto done;
2269 
2270 	/* Grow author column size if necessary, and set view->maxx. */
2271 	entry = s->first_displayed_entry;
2272 	ncommits = 0;
2273 	view->maxx = 0;
2274 	while (entry) {
2275 		char *author, *eol, *msg, *msg0;
2276 		wchar_t *wauthor, *wmsg;
2277 		int width;
2278 		if (ncommits >= limit - 1)
2279 			break;
2280 		author = strdup(got_object_commit_get_author(entry->commit));
2281 		if (author == NULL) {
2282 			err = got_error_from_errno("strdup");
2283 			goto done;
2284 		}
2285 		err = format_author(&wauthor, &width, author, COLS,
2286 		    date_display_cols);
2287 		if (author_cols < width)
2288 			author_cols = width;
2289 		free(wauthor);
2290 		free(author);
2291 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
2292 		if (err)
2293 			goto done;
2294 		msg = msg0;
2295 		while (*msg == '\n')
2296 			++msg;
2297 		if ((eol = strchr(msg, '\n')))
2298 			*eol = '\0';
2299 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2300 		    date_display_cols + author_cols, 0);
2301 		if (err)
2302 			goto done;
2303 		view->maxx = MAX(view->maxx, width);
2304 		free(msg0);
2305 		free(wmsg);
2306 		ncommits++;
2307 		entry = TAILQ_NEXT(entry, entry);
2308 	}
2309 
2310 	entry = s->first_displayed_entry;
2311 	s->last_displayed_entry = s->first_displayed_entry;
2312 	ncommits = 0;
2313 	while (entry) {
2314 		if (ncommits >= limit - 1)
2315 			break;
2316 		if (ncommits == s->selected)
2317 			wstandout(view->window);
2318 		err = draw_commit(view, entry->commit, entry->id,
2319 		    date_display_cols, author_cols);
2320 		if (ncommits == s->selected)
2321 			wstandend(view->window);
2322 		if (err)
2323 			goto done;
2324 		ncommits++;
2325 		s->last_displayed_entry = entry;
2326 		entry = TAILQ_NEXT(entry, entry);
2327 	}
2328 
2329 	view_border(view);
2330 done:
2331 	free(id_str);
2332 	free(refs_str);
2333 	free(ncommits_str);
2334 	free(header);
2335 	return err;
2336 }
2337 
2338 static void
2339 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2340 {
2341 	struct commit_queue_entry *entry;
2342 	int nscrolled = 0;
2343 
2344 	entry = TAILQ_FIRST(&s->commits.head);
2345 	if (s->first_displayed_entry == entry)
2346 		return;
2347 
2348 	entry = s->first_displayed_entry;
2349 	while (entry && nscrolled < maxscroll) {
2350 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2351 		if (entry) {
2352 			s->first_displayed_entry = entry;
2353 			nscrolled++;
2354 		}
2355 	}
2356 }
2357 
2358 static const struct got_error *
2359 trigger_log_thread(struct tog_view *view, int wait)
2360 {
2361 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2362 	int errcode;
2363 
2364 	halfdelay(1); /* fast refresh while loading commits */
2365 
2366 	while (!ta->log_complete && !tog_thread_error &&
2367 	    (ta->commits_needed > 0 || ta->load_all)) {
2368 		/* Wake the log thread. */
2369 		errcode = pthread_cond_signal(&ta->need_commits);
2370 		if (errcode)
2371 			return got_error_set_errno(errcode,
2372 			    "pthread_cond_signal");
2373 
2374 		/*
2375 		 * The mutex will be released while the view loop waits
2376 		 * in wgetch(), at which time the log thread will run.
2377 		 */
2378 		if (!wait)
2379 			break;
2380 
2381 		/* Display progress update in log view. */
2382 		show_log_view(view);
2383 		update_panels();
2384 		doupdate();
2385 
2386 		/* Wait right here while next commit is being loaded. */
2387 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2388 		if (errcode)
2389 			return got_error_set_errno(errcode,
2390 			    "pthread_cond_wait");
2391 
2392 		/* Display progress update in log view. */
2393 		show_log_view(view);
2394 		update_panels();
2395 		doupdate();
2396 	}
2397 
2398 	return NULL;
2399 }
2400 
2401 static const struct got_error *
2402 request_log_commits(struct tog_view *view)
2403 {
2404 	struct tog_log_view_state	*state = &view->state.log;
2405 	const struct got_error		*err = NULL;
2406 
2407 	if (state->thread_args.log_complete)
2408 		return NULL;
2409 
2410 	state->thread_args.commits_needed += view->nscrolled;
2411 	err = trigger_log_thread(view, 1);
2412 	view->nscrolled = 0;
2413 
2414 	return err;
2415 }
2416 
2417 static const struct got_error *
2418 log_scroll_down(struct tog_view *view, int maxscroll)
2419 {
2420 	struct tog_log_view_state *s = &view->state.log;
2421 	const struct got_error *err = NULL;
2422 	struct commit_queue_entry *pentry;
2423 	int nscrolled = 0, ncommits_needed;
2424 
2425 	if (s->last_displayed_entry == NULL)
2426 		return NULL;
2427 
2428 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2429 	if (s->commits.ncommits < ncommits_needed &&
2430 	    !s->thread_args.log_complete) {
2431 		/*
2432 		 * Ask the log thread for required amount of commits.
2433 		 */
2434 		s->thread_args.commits_needed += maxscroll;
2435 		err = trigger_log_thread(view, 1);
2436 		if (err)
2437 			return err;
2438 	}
2439 
2440 	do {
2441 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2442 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2443 			break;
2444 
2445 		s->last_displayed_entry = pentry ?
2446 		    pentry : s->last_displayed_entry;;
2447 
2448 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2449 		if (pentry == NULL)
2450 			break;
2451 		s->first_displayed_entry = pentry;
2452 	} while (++nscrolled < maxscroll);
2453 
2454 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2455 		view->nscrolled += nscrolled;
2456 	else
2457 		view->nscrolled = 0;
2458 
2459 	return err;
2460 }
2461 
2462 static const struct got_error *
2463 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2464     struct got_commit_object *commit, struct got_object_id *commit_id,
2465     struct tog_view *log_view, struct got_repository *repo)
2466 {
2467 	const struct got_error *err;
2468 	struct got_object_qid *parent_id;
2469 	struct tog_view *diff_view;
2470 
2471 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2472 	if (diff_view == NULL)
2473 		return got_error_from_errno("view_open");
2474 
2475 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2476 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2477 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2478 	if (err == NULL)
2479 		*new_view = diff_view;
2480 	return err;
2481 }
2482 
2483 static const struct got_error *
2484 tree_view_visit_subtree(struct tog_tree_view_state *s,
2485     struct got_tree_object *subtree)
2486 {
2487 	struct tog_parent_tree *parent;
2488 
2489 	parent = calloc(1, sizeof(*parent));
2490 	if (parent == NULL)
2491 		return got_error_from_errno("calloc");
2492 
2493 	parent->tree = s->tree;
2494 	parent->first_displayed_entry = s->first_displayed_entry;
2495 	parent->selected_entry = s->selected_entry;
2496 	parent->selected = s->selected;
2497 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2498 	s->tree = subtree;
2499 	s->selected = 0;
2500 	s->first_displayed_entry = NULL;
2501 	return NULL;
2502 }
2503 
2504 static const struct got_error *
2505 tree_view_walk_path(struct tog_tree_view_state *s,
2506     struct got_commit_object *commit, const char *path)
2507 {
2508 	const struct got_error *err = NULL;
2509 	struct got_tree_object *tree = NULL;
2510 	const char *p;
2511 	char *slash, *subpath = NULL;
2512 
2513 	/* Walk the path and open corresponding tree objects. */
2514 	p = path;
2515 	while (*p) {
2516 		struct got_tree_entry *te;
2517 		struct got_object_id *tree_id;
2518 		char *te_name;
2519 
2520 		while (p[0] == '/')
2521 			p++;
2522 
2523 		/* Ensure the correct subtree entry is selected. */
2524 		slash = strchr(p, '/');
2525 		if (slash == NULL)
2526 			te_name = strdup(p);
2527 		else
2528 			te_name = strndup(p, slash - p);
2529 		if (te_name == NULL) {
2530 			err = got_error_from_errno("strndup");
2531 			break;
2532 		}
2533 		te = got_object_tree_find_entry(s->tree, te_name);
2534 		if (te == NULL) {
2535 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2536 			free(te_name);
2537 			break;
2538 		}
2539 		free(te_name);
2540 		s->first_displayed_entry = s->selected_entry = te;
2541 
2542 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2543 			break; /* jump to this file's entry */
2544 
2545 		slash = strchr(p, '/');
2546 		if (slash)
2547 			subpath = strndup(path, slash - path);
2548 		else
2549 			subpath = strdup(path);
2550 		if (subpath == NULL) {
2551 			err = got_error_from_errno("strdup");
2552 			break;
2553 		}
2554 
2555 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2556 		    subpath);
2557 		if (err)
2558 			break;
2559 
2560 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2561 		free(tree_id);
2562 		if (err)
2563 			break;
2564 
2565 		err = tree_view_visit_subtree(s, tree);
2566 		if (err) {
2567 			got_object_tree_close(tree);
2568 			break;
2569 		}
2570 		if (slash == NULL)
2571 			break;
2572 		free(subpath);
2573 		subpath = NULL;
2574 		p = slash;
2575 	}
2576 
2577 	free(subpath);
2578 	return err;
2579 }
2580 
2581 static const struct got_error *
2582 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2583     struct commit_queue_entry *entry, const char *path,
2584     const char *head_ref_name, struct got_repository *repo)
2585 {
2586 	const struct got_error *err = NULL;
2587 	struct tog_tree_view_state *s;
2588 	struct tog_view *tree_view;
2589 
2590 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2591 	if (tree_view == NULL)
2592 		return got_error_from_errno("view_open");
2593 
2594 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2595 	if (err)
2596 		return err;
2597 	s = &tree_view->state.tree;
2598 
2599 	*new_view = tree_view;
2600 
2601 	if (got_path_is_root_dir(path))
2602 		return NULL;
2603 
2604 	return tree_view_walk_path(s, entry->commit, path);
2605 }
2606 
2607 static const struct got_error *
2608 block_signals_used_by_main_thread(void)
2609 {
2610 	sigset_t sigset;
2611 	int errcode;
2612 
2613 	if (sigemptyset(&sigset) == -1)
2614 		return got_error_from_errno("sigemptyset");
2615 
2616 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2617 	if (sigaddset(&sigset, SIGWINCH) == -1)
2618 		return got_error_from_errno("sigaddset");
2619 	if (sigaddset(&sigset, SIGCONT) == -1)
2620 		return got_error_from_errno("sigaddset");
2621 	if (sigaddset(&sigset, SIGINT) == -1)
2622 		return got_error_from_errno("sigaddset");
2623 	if (sigaddset(&sigset, SIGTERM) == -1)
2624 		return got_error_from_errno("sigaddset");
2625 
2626 	/* ncurses handles SIGTSTP */
2627 	if (sigaddset(&sigset, SIGTSTP) == -1)
2628 		return got_error_from_errno("sigaddset");
2629 
2630 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2631 	if (errcode)
2632 		return got_error_set_errno(errcode, "pthread_sigmask");
2633 
2634 	return NULL;
2635 }
2636 
2637 static void *
2638 log_thread(void *arg)
2639 {
2640 	const struct got_error *err = NULL;
2641 	int errcode = 0;
2642 	struct tog_log_thread_args *a = arg;
2643 	int done = 0;
2644 
2645 	/*
2646 	 * Sync startup with main thread such that we begin our
2647 	 * work once view_input() has released the mutex.
2648 	 */
2649 	errcode = pthread_mutex_lock(&tog_mutex);
2650 	if (errcode) {
2651 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2652 		return (void *)err;
2653 	}
2654 
2655 	err = block_signals_used_by_main_thread();
2656 	if (err) {
2657 		pthread_mutex_unlock(&tog_mutex);
2658 		goto done;
2659 	}
2660 
2661 	while (!done && !err && !tog_fatal_signal_received()) {
2662 		errcode = pthread_mutex_unlock(&tog_mutex);
2663 		if (errcode) {
2664 			err = got_error_set_errno(errcode,
2665 			    "pthread_mutex_unlock");
2666 			goto done;
2667 		}
2668 		err = queue_commits(a);
2669 		if (err) {
2670 			if (err->code != GOT_ERR_ITER_COMPLETED)
2671 				goto done;
2672 			err = NULL;
2673 			done = 1;
2674 		} else if (a->commits_needed > 0 && !a->load_all)
2675 			a->commits_needed--;
2676 
2677 		errcode = pthread_mutex_lock(&tog_mutex);
2678 		if (errcode) {
2679 			err = got_error_set_errno(errcode,
2680 			    "pthread_mutex_lock");
2681 			goto done;
2682 		} else if (*a->quit)
2683 			done = 1;
2684 		else if (*a->first_displayed_entry == NULL) {
2685 			*a->first_displayed_entry =
2686 			    TAILQ_FIRST(&a->commits->head);
2687 			*a->selected_entry = *a->first_displayed_entry;
2688 		}
2689 
2690 		errcode = pthread_cond_signal(&a->commit_loaded);
2691 		if (errcode) {
2692 			err = got_error_set_errno(errcode,
2693 			    "pthread_cond_signal");
2694 			pthread_mutex_unlock(&tog_mutex);
2695 			goto done;
2696 		}
2697 
2698 		if (done)
2699 			a->commits_needed = 0;
2700 		else {
2701 			if (a->commits_needed == 0 && !a->load_all) {
2702 				errcode = pthread_cond_wait(&a->need_commits,
2703 				    &tog_mutex);
2704 				if (errcode) {
2705 					err = got_error_set_errno(errcode,
2706 					    "pthread_cond_wait");
2707 					pthread_mutex_unlock(&tog_mutex);
2708 					goto done;
2709 				}
2710 				if (*a->quit)
2711 					done = 1;
2712 			}
2713 		}
2714 	}
2715 	a->log_complete = 1;
2716 	errcode = pthread_mutex_unlock(&tog_mutex);
2717 	if (errcode)
2718 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2719 done:
2720 	if (err) {
2721 		tog_thread_error = 1;
2722 		pthread_cond_signal(&a->commit_loaded);
2723 	}
2724 	return (void *)err;
2725 }
2726 
2727 static const struct got_error *
2728 stop_log_thread(struct tog_log_view_state *s)
2729 {
2730 	const struct got_error *err = NULL, *thread_err = NULL;
2731 	int errcode;
2732 
2733 	if (s->thread) {
2734 		s->quit = 1;
2735 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2736 		if (errcode)
2737 			return got_error_set_errno(errcode,
2738 			    "pthread_cond_signal");
2739 		errcode = pthread_mutex_unlock(&tog_mutex);
2740 		if (errcode)
2741 			return got_error_set_errno(errcode,
2742 			    "pthread_mutex_unlock");
2743 		errcode = pthread_join(s->thread, (void **)&thread_err);
2744 		if (errcode)
2745 			return got_error_set_errno(errcode, "pthread_join");
2746 		errcode = pthread_mutex_lock(&tog_mutex);
2747 		if (errcode)
2748 			return got_error_set_errno(errcode,
2749 			    "pthread_mutex_lock");
2750 		s->thread = NULL;
2751 	}
2752 
2753 	if (s->thread_args.repo) {
2754 		err = got_repo_close(s->thread_args.repo);
2755 		s->thread_args.repo = NULL;
2756 	}
2757 
2758 	if (s->thread_args.pack_fds) {
2759 		const struct got_error *pack_err =
2760 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2761 		if (err == NULL)
2762 			err = pack_err;
2763 		s->thread_args.pack_fds = NULL;
2764 	}
2765 
2766 	if (s->thread_args.graph) {
2767 		got_commit_graph_close(s->thread_args.graph);
2768 		s->thread_args.graph = NULL;
2769 	}
2770 
2771 	return err ? err : thread_err;
2772 }
2773 
2774 static const struct got_error *
2775 close_log_view(struct tog_view *view)
2776 {
2777 	const struct got_error *err = NULL;
2778 	struct tog_log_view_state *s = &view->state.log;
2779 	int errcode;
2780 
2781 	err = stop_log_thread(s);
2782 
2783 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2784 	if (errcode && err == NULL)
2785 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2786 
2787 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2788 	if (errcode && err == NULL)
2789 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2790 
2791 	free_commits(&s->commits);
2792 	free(s->in_repo_path);
2793 	s->in_repo_path = NULL;
2794 	free(s->start_id);
2795 	s->start_id = NULL;
2796 	free(s->head_ref_name);
2797 	s->head_ref_name = NULL;
2798 	return err;
2799 }
2800 
2801 static const struct got_error *
2802 search_start_log_view(struct tog_view *view)
2803 {
2804 	struct tog_log_view_state *s = &view->state.log;
2805 
2806 	s->matched_entry = NULL;
2807 	s->search_entry = NULL;
2808 	return NULL;
2809 }
2810 
2811 static const struct got_error *
2812 search_next_log_view(struct tog_view *view)
2813 {
2814 	const struct got_error *err = NULL;
2815 	struct tog_log_view_state *s = &view->state.log;
2816 	struct commit_queue_entry *entry;
2817 
2818 	/* Display progress update in log view. */
2819 	show_log_view(view);
2820 	update_panels();
2821 	doupdate();
2822 
2823 	if (s->search_entry) {
2824 		int errcode, ch;
2825 		errcode = pthread_mutex_unlock(&tog_mutex);
2826 		if (errcode)
2827 			return got_error_set_errno(errcode,
2828 			    "pthread_mutex_unlock");
2829 		ch = wgetch(view->window);
2830 		errcode = pthread_mutex_lock(&tog_mutex);
2831 		if (errcode)
2832 			return got_error_set_errno(errcode,
2833 			    "pthread_mutex_lock");
2834 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2835 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2836 			return NULL;
2837 		}
2838 		if (view->searching == TOG_SEARCH_FORWARD)
2839 			entry = TAILQ_NEXT(s->search_entry, entry);
2840 		else
2841 			entry = TAILQ_PREV(s->search_entry,
2842 			    commit_queue_head, entry);
2843 	} else if (s->matched_entry) {
2844 		int matched_idx = s->matched_entry->idx;
2845 		int selected_idx = s->selected_entry->idx;
2846 
2847 		/*
2848 		 * If the user has moved the cursor after we hit a match,
2849 		 * the position from where we should continue searching
2850 		 * might have changed.
2851 		 */
2852 		if (view->searching == TOG_SEARCH_FORWARD) {
2853 			if (matched_idx > selected_idx)
2854 				entry = TAILQ_NEXT(s->selected_entry, entry);
2855 			else
2856 				entry = TAILQ_NEXT(s->matched_entry, entry);
2857 		} else {
2858 			if (matched_idx < selected_idx)
2859 				entry = TAILQ_PREV(s->selected_entry,
2860 						commit_queue_head, entry);
2861 			else
2862 				entry = TAILQ_PREV(s->matched_entry,
2863 						commit_queue_head, entry);
2864 		}
2865 	} else {
2866 		entry = s->selected_entry;
2867 	}
2868 
2869 	while (1) {
2870 		int have_match = 0;
2871 
2872 		if (entry == NULL) {
2873 			if (s->thread_args.log_complete ||
2874 			    view->searching == TOG_SEARCH_BACKWARD) {
2875 				view->search_next_done =
2876 				    (s->matched_entry == NULL ?
2877 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2878 				s->search_entry = NULL;
2879 				return NULL;
2880 			}
2881 			/*
2882 			 * Poke the log thread for more commits and return,
2883 			 * allowing the main loop to make progress. Search
2884 			 * will resume at s->search_entry once we come back.
2885 			 */
2886 			s->thread_args.commits_needed++;
2887 			return trigger_log_thread(view, 0);
2888 		}
2889 
2890 		err = match_commit(&have_match, entry->id, entry->commit,
2891 		    &view->regex);
2892 		if (err)
2893 			break;
2894 		if (have_match) {
2895 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2896 			s->matched_entry = entry;
2897 			break;
2898 		}
2899 
2900 		s->search_entry = entry;
2901 		if (view->searching == TOG_SEARCH_FORWARD)
2902 			entry = TAILQ_NEXT(entry, entry);
2903 		else
2904 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2905 	}
2906 
2907 	if (s->matched_entry) {
2908 		int cur = s->selected_entry->idx;
2909 		while (cur < s->matched_entry->idx) {
2910 			err = input_log_view(NULL, view, KEY_DOWN);
2911 			if (err)
2912 				return err;
2913 			cur++;
2914 		}
2915 		while (cur > s->matched_entry->idx) {
2916 			err = input_log_view(NULL, view, KEY_UP);
2917 			if (err)
2918 				return err;
2919 			cur--;
2920 		}
2921 	}
2922 
2923 	s->search_entry = NULL;
2924 
2925 	return NULL;
2926 }
2927 
2928 static const struct got_error *
2929 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2930     struct got_repository *repo, const char *head_ref_name,
2931     const char *in_repo_path, int log_branches)
2932 {
2933 	const struct got_error *err = NULL;
2934 	struct tog_log_view_state *s = &view->state.log;
2935 	struct got_repository *thread_repo = NULL;
2936 	struct got_commit_graph *thread_graph = NULL;
2937 	int errcode;
2938 
2939 	if (in_repo_path != s->in_repo_path) {
2940 		free(s->in_repo_path);
2941 		s->in_repo_path = strdup(in_repo_path);
2942 		if (s->in_repo_path == NULL)
2943 			return got_error_from_errno("strdup");
2944 	}
2945 
2946 	/* The commit queue only contains commits being displayed. */
2947 	TAILQ_INIT(&s->commits.head);
2948 	s->commits.ncommits = 0;
2949 
2950 	s->repo = repo;
2951 	if (head_ref_name) {
2952 		s->head_ref_name = strdup(head_ref_name);
2953 		if (s->head_ref_name == NULL) {
2954 			err = got_error_from_errno("strdup");
2955 			goto done;
2956 		}
2957 	}
2958 	s->start_id = got_object_id_dup(start_id);
2959 	if (s->start_id == NULL) {
2960 		err = got_error_from_errno("got_object_id_dup");
2961 		goto done;
2962 	}
2963 	s->log_branches = log_branches;
2964 
2965 	STAILQ_INIT(&s->colors);
2966 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2967 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2968 		    get_color_value("TOG_COLOR_COMMIT"));
2969 		if (err)
2970 			goto done;
2971 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2972 		    get_color_value("TOG_COLOR_AUTHOR"));
2973 		if (err) {
2974 			free_colors(&s->colors);
2975 			goto done;
2976 		}
2977 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2978 		    get_color_value("TOG_COLOR_DATE"));
2979 		if (err) {
2980 			free_colors(&s->colors);
2981 			goto done;
2982 		}
2983 	}
2984 
2985 	view->show = show_log_view;
2986 	view->input = input_log_view;
2987 	view->close = close_log_view;
2988 	view->search_start = search_start_log_view;
2989 	view->search_next = search_next_log_view;
2990 
2991 	if (s->thread_args.pack_fds == NULL) {
2992 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2993 		if (err)
2994 			goto done;
2995 	}
2996 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
2997 	    s->thread_args.pack_fds);
2998 	if (err)
2999 		goto done;
3000 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3001 	    !s->log_branches);
3002 	if (err)
3003 		goto done;
3004 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3005 	    s->repo, NULL, NULL);
3006 	if (err)
3007 		goto done;
3008 
3009 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3010 	if (errcode) {
3011 		err = got_error_set_errno(errcode, "pthread_cond_init");
3012 		goto done;
3013 	}
3014 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3015 	if (errcode) {
3016 		err = got_error_set_errno(errcode, "pthread_cond_init");
3017 		goto done;
3018 	}
3019 
3020 	s->thread_args.commits_needed = view->nlines;
3021 	s->thread_args.graph = thread_graph;
3022 	s->thread_args.commits = &s->commits;
3023 	s->thread_args.in_repo_path = s->in_repo_path;
3024 	s->thread_args.start_id = s->start_id;
3025 	s->thread_args.repo = thread_repo;
3026 	s->thread_args.log_complete = 0;
3027 	s->thread_args.quit = &s->quit;
3028 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3029 	s->thread_args.selected_entry = &s->selected_entry;
3030 	s->thread_args.searching = &view->searching;
3031 	s->thread_args.search_next_done = &view->search_next_done;
3032 	s->thread_args.regex = &view->regex;
3033 done:
3034 	if (err)
3035 		close_log_view(view);
3036 	return err;
3037 }
3038 
3039 static const struct got_error *
3040 show_log_view(struct tog_view *view)
3041 {
3042 	const struct got_error *err;
3043 	struct tog_log_view_state *s = &view->state.log;
3044 
3045 	if (s->thread == NULL) {
3046 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3047 		    &s->thread_args);
3048 		if (errcode)
3049 			return got_error_set_errno(errcode, "pthread_create");
3050 		if (s->thread_args.commits_needed > 0) {
3051 			err = trigger_log_thread(view, 1);
3052 			if (err)
3053 				return err;
3054 		}
3055 	}
3056 
3057 	return draw_commits(view);
3058 }
3059 
3060 static void
3061 log_move_cursor_up(struct tog_view *view, int page, int home)
3062 {
3063 	struct tog_log_view_state *s = &view->state.log;
3064 
3065 	if (s->selected_entry->idx == 0)
3066 		view->count = 0;
3067 	if (s->first_displayed_entry == NULL)
3068 		return;
3069 
3070 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3071 	    || home)
3072 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3073 
3074 	if (!page && !home && s->selected > 0)
3075 		--s->selected;
3076 	else
3077 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3078 
3079 	select_commit(s);
3080 	return;
3081 }
3082 
3083 static const struct got_error *
3084 log_move_cursor_down(struct tog_view *view, int page)
3085 {
3086 	struct tog_log_view_state	*s = &view->state.log;
3087 	struct commit_queue_entry	*first;
3088 	const struct got_error		*err = NULL;
3089 
3090 	first = s->first_displayed_entry;
3091 	if (first == NULL) {
3092 		view->count = 0;
3093 		return NULL;
3094 	}
3095 
3096 	if (s->thread_args.log_complete &&
3097 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3098 		return NULL;
3099 
3100 	if (!page) {
3101 		int eos = view->nlines - 2;
3102 
3103 		if (view_is_hsplit_top(view))
3104 			--eos;  /* border consumes the last line */
3105 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3106 			++s->selected;
3107 		else
3108 			err = log_scroll_down(view, 1);
3109 	} else if (s->thread_args.load_all) {
3110 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3111 			s->selected += MIN(s->last_displayed_entry->idx -
3112 			    s->selected_entry->idx, page + 1);
3113 		else
3114 			err = log_scroll_down(view, MIN(page,
3115 			    s->commits.ncommits - s->selected_entry->idx - 1));
3116 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3117 	} else {
3118 		err = log_scroll_down(view, page);
3119 		if (err)
3120 			return err;
3121 		if (first == s->first_displayed_entry && s->selected <
3122 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3123 			s->selected = MIN(s->commits.ncommits - 1, page);
3124 		}
3125 	}
3126 	if (err)
3127 		return err;
3128 
3129 	/*
3130 	 * We might necessarily overshoot in horizontal
3131 	 * splits; if so, select the last displayed commit.
3132 	 */
3133 	s->selected = MIN(s->selected,
3134 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3135 
3136 	select_commit(s);
3137 
3138 	if (s->thread_args.log_complete &&
3139 	    s->selected_entry->idx == s->commits.ncommits - 1)
3140 		view->count = 0;
3141 
3142 	return NULL;
3143 }
3144 
3145 static void
3146 view_get_split(struct tog_view *view, int *y, int *x)
3147 {
3148 	*x = 0;
3149 	*y = 0;
3150 
3151 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3152 		if (view->child && view->child->resized_y)
3153 			*y = view->child->resized_y;
3154 		else if (view->resized_y)
3155 			*y = view->resized_y;
3156 		else
3157 			*y = view_split_begin_y(view->lines);
3158 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3159 		if (view->child && view->child->resized_x)
3160 			*x = view->child->resized_x;
3161 		else if (view->resized_x)
3162 			*x = view->resized_x;
3163 		else
3164 			*x = view_split_begin_x(view->begin_x);
3165 	}
3166 }
3167 
3168 /* Split view horizontally at y and offset view->state->selected line. */
3169 static const struct got_error *
3170 view_init_hsplit(struct tog_view *view, int y)
3171 {
3172 	const struct got_error *err = NULL;
3173 
3174 	view->nlines = y;
3175 	view->ncols = COLS;
3176 	err = view_resize(view);
3177 	if (err)
3178 		return err;
3179 
3180 	err = offset_selection_down(view);
3181 
3182 	return err;
3183 }
3184 
3185 static const struct got_error *
3186 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3187 {
3188 	const struct got_error *err = NULL;
3189 	struct tog_log_view_state *s = &view->state.log;
3190 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3191 	struct tog_view *ref_view = NULL;
3192 	struct commit_queue_entry *entry;
3193 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3194 
3195 	if (s->thread_args.load_all) {
3196 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3197 			s->thread_args.load_all = 0;
3198 		else if (s->thread_args.log_complete) {
3199 			err = log_move_cursor_down(view, s->commits.ncommits);
3200 			s->thread_args.load_all = 0;
3201 		}
3202 		return err;
3203 	}
3204 
3205 	eos = nscroll = view->nlines - 1;
3206 	if (view_is_hsplit_top(view))
3207 		--eos;  /* border */
3208 
3209 	switch (ch) {
3210 	case 'q':
3211 		s->quit = 1;
3212 		break;
3213 	case '0':
3214 		view->x = 0;
3215 		break;
3216 	case '$':
3217 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3218 		view->count = 0;
3219 		break;
3220 	case KEY_RIGHT:
3221 	case 'l':
3222 		if (view->x + view->ncols / 2 < view->maxx)
3223 			view->x += 2;  /* move two columns right */
3224 		else
3225 			view->count = 0;
3226 		break;
3227 	case KEY_LEFT:
3228 	case 'h':
3229 		view->x -= MIN(view->x, 2);  /* move two columns back */
3230 		if (view->x <= 0)
3231 			view->count = 0;
3232 		break;
3233 	case 'k':
3234 	case KEY_UP:
3235 	case '<':
3236 	case ',':
3237 	case CTRL('p'):
3238 		log_move_cursor_up(view, 0, 0);
3239 		break;
3240 	case 'g':
3241 	case KEY_HOME:
3242 		log_move_cursor_up(view, 0, 1);
3243 		view->count = 0;
3244 		break;
3245 	case CTRL('u'):
3246 	case 'u':
3247 		nscroll /= 2;
3248 		/* FALL THROUGH */
3249 	case KEY_PPAGE:
3250 	case CTRL('b'):
3251 	case 'b':
3252 		log_move_cursor_up(view, nscroll, 0);
3253 		break;
3254 	case 'j':
3255 	case KEY_DOWN:
3256 	case '>':
3257 	case '.':
3258 	case CTRL('n'):
3259 		err = log_move_cursor_down(view, 0);
3260 		break;
3261 	case 'G':
3262 	case KEY_END: {
3263 		/* We don't know yet how many commits, so we're forced to
3264 		 * traverse them all. */
3265 		view->count = 0;
3266 		if (!s->thread_args.log_complete) {
3267 			s->thread_args.load_all = 1;
3268 			return trigger_log_thread(view, 0);
3269 		}
3270 
3271 		s->selected = 0;
3272 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3273 		for (n = 0; n < eos; n++) {
3274 			if (entry == NULL)
3275 				break;
3276 			s->first_displayed_entry = entry;
3277 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3278 		}
3279 		if (n > 0)
3280 			s->selected = n - 1;
3281 		select_commit(s);
3282 		break;
3283 	}
3284 	case CTRL('d'):
3285 	case 'd':
3286 		nscroll /= 2;
3287 		/* FALL THROUGH */
3288 	case KEY_NPAGE:
3289 	case CTRL('f'):
3290 	case 'f':
3291 	case ' ':
3292 		err = log_move_cursor_down(view, nscroll);
3293 		break;
3294 	case KEY_RESIZE:
3295 		if (s->selected > view->nlines - 2)
3296 			s->selected = view->nlines - 2;
3297 		if (s->selected > s->commits.ncommits - 1)
3298 			s->selected = s->commits.ncommits - 1;
3299 		select_commit(s);
3300 		if (s->commits.ncommits < view->nlines - 1 &&
3301 		    !s->thread_args.log_complete) {
3302 			s->thread_args.commits_needed += (view->nlines - 1) -
3303 			    s->commits.ncommits;
3304 			err = trigger_log_thread(view, 1);
3305 		}
3306 		break;
3307 	case KEY_ENTER:
3308 	case '\r':
3309 		view->count = 0;
3310 		if (s->selected_entry == NULL)
3311 			break;
3312 
3313 		/* get dimensions--don't split till initialisation succeeds */
3314 		if (view_is_parent_view(view))
3315 			view_get_split(view, &begin_y, &begin_x);
3316 
3317 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3318 		    s->selected_entry->commit, s->selected_entry->id,
3319 		    view, s->repo);
3320 		if (err)
3321 			break;
3322 
3323 		if (view_is_parent_view(view) &&
3324 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3325 			err = view_init_hsplit(view, begin_y);
3326 			if (err)
3327 				break;
3328 		}
3329 
3330 		view->focussed = 0;
3331 		diff_view->focussed = 1;
3332 		diff_view->mode = view->mode;
3333 		diff_view->nlines = view->lines - begin_y;
3334 
3335 		if (view_is_parent_view(view)) {
3336 			view_transfer_size(diff_view, view);
3337 			err = view_close_child(view);
3338 			if (err)
3339 				return err;
3340 			err = view_set_child(view, diff_view);
3341 			if (err)
3342 				return err;
3343 			view->focus_child = 1;
3344 		} else
3345 			*new_view = diff_view;
3346 		break;
3347 	case 't':
3348 		view->count = 0;
3349 		if (s->selected_entry == NULL)
3350 			break;
3351 		if (view_is_parent_view(view))
3352 			view_get_split(view, &begin_y, &begin_x);
3353 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3354 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3355 		    s->repo);
3356 		if (err)
3357 			break;
3358 		if (view_is_parent_view(view) &&
3359 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3360 			err = view_init_hsplit(view, begin_y);
3361 			if (err)
3362 				break;
3363 		}
3364 		view->focussed = 0;
3365 		tree_view->focussed = 1;
3366 		tree_view->mode = view->mode;
3367 		tree_view->nlines = view->lines - begin_y;
3368 		if (view_is_parent_view(view)) {
3369 			view_transfer_size(tree_view, view);
3370 			err = view_close_child(view);
3371 			if (err)
3372 				return err;
3373 			err = view_set_child(view, tree_view);
3374 			if (err)
3375 				return err;
3376 			view->focus_child = 1;
3377 		} else
3378 			*new_view = tree_view;
3379 		break;
3380 	case KEY_BACKSPACE:
3381 	case CTRL('l'):
3382 	case 'B':
3383 		view->count = 0;
3384 		if (ch == KEY_BACKSPACE &&
3385 		    got_path_is_root_dir(s->in_repo_path))
3386 			break;
3387 		err = stop_log_thread(s);
3388 		if (err)
3389 			return err;
3390 		if (ch == KEY_BACKSPACE) {
3391 			char *parent_path;
3392 			err = got_path_dirname(&parent_path, s->in_repo_path);
3393 			if (err)
3394 				return err;
3395 			free(s->in_repo_path);
3396 			s->in_repo_path = parent_path;
3397 			s->thread_args.in_repo_path = s->in_repo_path;
3398 		} else if (ch == CTRL('l')) {
3399 			struct got_object_id *start_id;
3400 			err = got_repo_match_object_id(&start_id, NULL,
3401 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3402 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3403 			if (err)
3404 				return err;
3405 			free(s->start_id);
3406 			s->start_id = start_id;
3407 			s->thread_args.start_id = s->start_id;
3408 		} else /* 'B' */
3409 			s->log_branches = !s->log_branches;
3410 
3411 		if (s->thread_args.pack_fds == NULL) {
3412 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3413 			if (err)
3414 				return err;
3415 		}
3416 		err = got_repo_open(&s->thread_args.repo,
3417 		    got_repo_get_path(s->repo), NULL,
3418 		    s->thread_args.pack_fds);
3419 		if (err)
3420 			return err;
3421 		tog_free_refs();
3422 		err = tog_load_refs(s->repo, 0);
3423 		if (err)
3424 			return err;
3425 		err = got_commit_graph_open(&s->thread_args.graph,
3426 		    s->in_repo_path, !s->log_branches);
3427 		if (err)
3428 			return err;
3429 		err = got_commit_graph_iter_start(s->thread_args.graph,
3430 		    s->start_id, s->repo, NULL, NULL);
3431 		if (err)
3432 			return err;
3433 		free_commits(&s->commits);
3434 		s->first_displayed_entry = NULL;
3435 		s->last_displayed_entry = NULL;
3436 		s->selected_entry = NULL;
3437 		s->selected = 0;
3438 		s->thread_args.log_complete = 0;
3439 		s->quit = 0;
3440 		s->thread_args.commits_needed = view->lines;
3441 		s->matched_entry = NULL;
3442 		s->search_entry = NULL;
3443 		break;
3444 	case 'r':
3445 		view->count = 0;
3446 		if (view_is_parent_view(view))
3447 			view_get_split(view, &begin_y, &begin_x);
3448 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3449 		if (ref_view == NULL)
3450 			return got_error_from_errno("view_open");
3451 		err = open_ref_view(ref_view, s->repo);
3452 		if (err) {
3453 			view_close(ref_view);
3454 			return err;
3455 		}
3456 		if (view_is_parent_view(view) &&
3457 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3458 			err = view_init_hsplit(view, begin_y);
3459 			if (err)
3460 				break;
3461 		}
3462 		view->focussed = 0;
3463 		ref_view->focussed = 1;
3464 		ref_view->mode = view->mode;
3465 		ref_view->nlines = view->lines - begin_y;
3466 		if (view_is_parent_view(view)) {
3467 			view_transfer_size(ref_view, view);
3468 			err = view_close_child(view);
3469 			if (err)
3470 				return err;
3471 			err = view_set_child(view, ref_view);
3472 			if (err)
3473 				return err;
3474 			view->focus_child = 1;
3475 		} else
3476 			*new_view = ref_view;
3477 		break;
3478 	default:
3479 		view->count = 0;
3480 		break;
3481 	}
3482 
3483 	return err;
3484 }
3485 
3486 static const struct got_error *
3487 apply_unveil(const char *repo_path, const char *worktree_path)
3488 {
3489 	const struct got_error *error;
3490 
3491 #ifdef PROFILE
3492 	if (unveil("gmon.out", "rwc") != 0)
3493 		return got_error_from_errno2("unveil", "gmon.out");
3494 #endif
3495 	if (repo_path && unveil(repo_path, "r") != 0)
3496 		return got_error_from_errno2("unveil", repo_path);
3497 
3498 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3499 		return got_error_from_errno2("unveil", worktree_path);
3500 
3501 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3502 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3503 
3504 	error = got_privsep_unveil_exec_helpers();
3505 	if (error != NULL)
3506 		return error;
3507 
3508 	if (unveil(NULL, NULL) != 0)
3509 		return got_error_from_errno("unveil");
3510 
3511 	return NULL;
3512 }
3513 
3514 static void
3515 init_curses(void)
3516 {
3517 	/*
3518 	 * Override default signal handlers before starting ncurses.
3519 	 * This should prevent ncurses from installing its own
3520 	 * broken cleanup() signal handler.
3521 	 */
3522 	signal(SIGWINCH, tog_sigwinch);
3523 	signal(SIGPIPE, tog_sigpipe);
3524 	signal(SIGCONT, tog_sigcont);
3525 	signal(SIGINT, tog_sigint);
3526 	signal(SIGTERM, tog_sigterm);
3527 
3528 	initscr();
3529 	cbreak();
3530 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3531 	noecho();
3532 	nonl();
3533 	intrflush(stdscr, FALSE);
3534 	keypad(stdscr, TRUE);
3535 	curs_set(0);
3536 	if (getenv("TOG_COLORS") != NULL) {
3537 		start_color();
3538 		use_default_colors();
3539 	}
3540 }
3541 
3542 static const struct got_error *
3543 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3544     struct got_repository *repo, struct got_worktree *worktree)
3545 {
3546 	const struct got_error *err = NULL;
3547 
3548 	if (argc == 0) {
3549 		*in_repo_path = strdup("/");
3550 		if (*in_repo_path == NULL)
3551 			return got_error_from_errno("strdup");
3552 		return NULL;
3553 	}
3554 
3555 	if (worktree) {
3556 		const char *prefix = got_worktree_get_path_prefix(worktree);
3557 		char *p;
3558 
3559 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3560 		if (err)
3561 			return err;
3562 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3563 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3564 		    p) == -1) {
3565 			err = got_error_from_errno("asprintf");
3566 			*in_repo_path = NULL;
3567 		}
3568 		free(p);
3569 	} else
3570 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3571 
3572 	return err;
3573 }
3574 
3575 static const struct got_error *
3576 cmd_log(int argc, char *argv[])
3577 {
3578 	const struct got_error *error;
3579 	struct got_repository *repo = NULL;
3580 	struct got_worktree *worktree = NULL;
3581 	struct got_object_id *start_id = NULL;
3582 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3583 	char *start_commit = NULL, *label = NULL;
3584 	struct got_reference *ref = NULL;
3585 	const char *head_ref_name = NULL;
3586 	int ch, log_branches = 0;
3587 	struct tog_view *view;
3588 	int *pack_fds = NULL;
3589 
3590 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3591 		switch (ch) {
3592 		case 'b':
3593 			log_branches = 1;
3594 			break;
3595 		case 'c':
3596 			start_commit = optarg;
3597 			break;
3598 		case 'r':
3599 			repo_path = realpath(optarg, NULL);
3600 			if (repo_path == NULL)
3601 				return got_error_from_errno2("realpath",
3602 				    optarg);
3603 			break;
3604 		default:
3605 			usage_log();
3606 			/* NOTREACHED */
3607 		}
3608 	}
3609 
3610 	argc -= optind;
3611 	argv += optind;
3612 
3613 	if (argc > 1)
3614 		usage_log();
3615 
3616 	error = got_repo_pack_fds_open(&pack_fds);
3617 	if (error != NULL)
3618 		goto done;
3619 
3620 	if (repo_path == NULL) {
3621 		cwd = getcwd(NULL, 0);
3622 		if (cwd == NULL)
3623 			return got_error_from_errno("getcwd");
3624 		error = got_worktree_open(&worktree, cwd);
3625 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3626 			goto done;
3627 		if (worktree)
3628 			repo_path =
3629 			    strdup(got_worktree_get_repo_path(worktree));
3630 		else
3631 			repo_path = strdup(cwd);
3632 		if (repo_path == NULL) {
3633 			error = got_error_from_errno("strdup");
3634 			goto done;
3635 		}
3636 	}
3637 
3638 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3639 	if (error != NULL)
3640 		goto done;
3641 
3642 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3643 	    repo, worktree);
3644 	if (error)
3645 		goto done;
3646 
3647 	init_curses();
3648 
3649 	error = apply_unveil(got_repo_get_path(repo),
3650 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3651 	if (error)
3652 		goto done;
3653 
3654 	/* already loaded by tog_log_with_path()? */
3655 	if (TAILQ_EMPTY(&tog_refs)) {
3656 		error = tog_load_refs(repo, 0);
3657 		if (error)
3658 			goto done;
3659 	}
3660 
3661 	if (start_commit == NULL) {
3662 		error = got_repo_match_object_id(&start_id, &label,
3663 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3664 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3665 		if (error)
3666 			goto done;
3667 		head_ref_name = label;
3668 	} else {
3669 		error = got_ref_open(&ref, repo, start_commit, 0);
3670 		if (error == NULL)
3671 			head_ref_name = got_ref_get_name(ref);
3672 		else if (error->code != GOT_ERR_NOT_REF)
3673 			goto done;
3674 		error = got_repo_match_object_id(&start_id, NULL,
3675 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3676 		if (error)
3677 			goto done;
3678 	}
3679 
3680 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3681 	if (view == NULL) {
3682 		error = got_error_from_errno("view_open");
3683 		goto done;
3684 	}
3685 	error = open_log_view(view, start_id, repo, head_ref_name,
3686 	    in_repo_path, log_branches);
3687 	if (error)
3688 		goto done;
3689 	if (worktree) {
3690 		/* Release work tree lock. */
3691 		got_worktree_close(worktree);
3692 		worktree = NULL;
3693 	}
3694 	error = view_loop(view);
3695 done:
3696 	free(in_repo_path);
3697 	free(repo_path);
3698 	free(cwd);
3699 	free(start_id);
3700 	free(label);
3701 	if (ref)
3702 		got_ref_close(ref);
3703 	if (repo) {
3704 		const struct got_error *close_err = got_repo_close(repo);
3705 		if (error == NULL)
3706 			error = close_err;
3707 	}
3708 	if (worktree)
3709 		got_worktree_close(worktree);
3710 	if (pack_fds) {
3711 		const struct got_error *pack_err =
3712 		    got_repo_pack_fds_close(pack_fds);
3713 		if (error == NULL)
3714 			error = pack_err;
3715 	}
3716 	tog_free_refs();
3717 	return error;
3718 }
3719 
3720 __dead static void
3721 usage_diff(void)
3722 {
3723 	endwin();
3724 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3725 	    "[-w] object1 object2\n", getprogname());
3726 	exit(1);
3727 }
3728 
3729 static int
3730 match_line(const char *line, regex_t *regex, size_t nmatch,
3731     regmatch_t *regmatch)
3732 {
3733 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3734 }
3735 
3736 static struct tog_color *
3737 match_color(struct tog_colors *colors, const char *line)
3738 {
3739 	struct tog_color *tc = NULL;
3740 
3741 	STAILQ_FOREACH(tc, colors, entry) {
3742 		if (match_line(line, &tc->regex, 0, NULL))
3743 			return tc;
3744 	}
3745 
3746 	return NULL;
3747 }
3748 
3749 static const struct got_error *
3750 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3751     WINDOW *window, int skipcol, regmatch_t *regmatch)
3752 {
3753 	const struct got_error *err = NULL;
3754 	char *exstr = NULL;
3755 	wchar_t *wline = NULL;
3756 	int rme, rms, n, width, scrollx;
3757 	int width0 = 0, width1 = 0, width2 = 0;
3758 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3759 
3760 	*wtotal = 0;
3761 
3762 	rms = regmatch->rm_so;
3763 	rme = regmatch->rm_eo;
3764 
3765 	err = expand_tab(&exstr, line);
3766 	if (err)
3767 		return err;
3768 
3769 	/* Split the line into 3 segments, according to match offsets. */
3770 	seg0 = strndup(exstr, rms);
3771 	if (seg0 == NULL) {
3772 		err = got_error_from_errno("strndup");
3773 		goto done;
3774 	}
3775 	seg1 = strndup(exstr + rms, rme - rms);
3776 	if (seg1 == NULL) {
3777 		err = got_error_from_errno("strndup");
3778 		goto done;
3779 	}
3780 	seg2 = strdup(exstr + rme);
3781 	if (seg2 == NULL) {
3782 		err = got_error_from_errno("strndup");
3783 		goto done;
3784 	}
3785 
3786 	/* draw up to matched token if we haven't scrolled past it */
3787 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3788 	    col_tab_align, 1);
3789 	if (err)
3790 		goto done;
3791 	n = MAX(width0 - skipcol, 0);
3792 	if (n) {
3793 		free(wline);
3794 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3795 		    wlimit, col_tab_align, 1);
3796 		if (err)
3797 			goto done;
3798 		waddwstr(window, &wline[scrollx]);
3799 		wlimit -= width;
3800 		*wtotal += width;
3801 	}
3802 
3803 	if (wlimit > 0) {
3804 		int i = 0, w = 0;
3805 		size_t wlen;
3806 
3807 		free(wline);
3808 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3809 		    col_tab_align, 1);
3810 		if (err)
3811 			goto done;
3812 		wlen = wcslen(wline);
3813 		while (i < wlen) {
3814 			width = wcwidth(wline[i]);
3815 			if (width == -1) {
3816 				/* should not happen, tabs are expanded */
3817 				err = got_error(GOT_ERR_RANGE);
3818 				goto done;
3819 			}
3820 			if (width0 + w + width > skipcol)
3821 				break;
3822 			w += width;
3823 			i++;
3824 		}
3825 		/* draw (visible part of) matched token (if scrolled into it) */
3826 		if (width1 - w > 0) {
3827 			wattron(window, A_STANDOUT);
3828 			waddwstr(window, &wline[i]);
3829 			wattroff(window, A_STANDOUT);
3830 			wlimit -= (width1 - w);
3831 			*wtotal += (width1 - w);
3832 		}
3833 	}
3834 
3835 	if (wlimit > 0) {  /* draw rest of line */
3836 		free(wline);
3837 		if (skipcol > width0 + width1) {
3838 			err = format_line(&wline, &width2, &scrollx, seg2,
3839 			    skipcol - (width0 + width1), wlimit,
3840 			    col_tab_align, 1);
3841 			if (err)
3842 				goto done;
3843 			waddwstr(window, &wline[scrollx]);
3844 		} else {
3845 			err = format_line(&wline, &width2, NULL, seg2, 0,
3846 			    wlimit, col_tab_align, 1);
3847 			if (err)
3848 				goto done;
3849 			waddwstr(window, wline);
3850 		}
3851 		*wtotal += width2;
3852 	}
3853 done:
3854 	free(wline);
3855 	free(exstr);
3856 	free(seg0);
3857 	free(seg1);
3858 	free(seg2);
3859 	return err;
3860 }
3861 
3862 static const struct got_error *
3863 draw_file(struct tog_view *view, const char *header)
3864 {
3865 	struct tog_diff_view_state *s = &view->state.diff;
3866 	regmatch_t *regmatch = &view->regmatch;
3867 	const struct got_error *err;
3868 	int nprinted = 0;
3869 	char *line;
3870 	size_t linesize = 0;
3871 	ssize_t linelen;
3872 	struct tog_color *tc;
3873 	wchar_t *wline;
3874 	int width;
3875 	int max_lines = view->nlines;
3876 	int nlines = s->nlines;
3877 	off_t line_offset;
3878 
3879 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3880 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3881 		return got_error_from_errno("fseek");
3882 
3883 	werase(view->window);
3884 
3885 	if (header) {
3886 		if (asprintf(&line, "[%d/%d] %s",
3887 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3888 		    header) == -1)
3889 			return got_error_from_errno("asprintf");
3890 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3891 		    0, 0);
3892 		free(line);
3893 		if (err)
3894 			return err;
3895 
3896 		if (view_needs_focus_indication(view))
3897 			wstandout(view->window);
3898 		waddwstr(view->window, wline);
3899 		free(wline);
3900 		wline = NULL;
3901 		if (view_needs_focus_indication(view))
3902 			wstandend(view->window);
3903 		if (width <= view->ncols - 1)
3904 			waddch(view->window, '\n');
3905 
3906 		if (max_lines <= 1)
3907 			return NULL;
3908 		max_lines--;
3909 	}
3910 
3911 	s->eof = 0;
3912 	view->maxx = 0;
3913 	line = NULL;
3914 	while (max_lines > 0 && nprinted < max_lines) {
3915 		linelen = getline(&line, &linesize, s->f);
3916 		if (linelen == -1) {
3917 			if (feof(s->f)) {
3918 				s->eof = 1;
3919 				break;
3920 			}
3921 			free(line);
3922 			return got_ferror(s->f, GOT_ERR_IO);
3923 		}
3924 
3925 		/* Set view->maxx based on full line length. */
3926 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3927 		    view->x ? 1 : 0);
3928 		if (err) {
3929 			free(line);
3930 			return err;
3931 		}
3932 		view->maxx = MAX(view->maxx, width);
3933 		free(wline);
3934 		wline = NULL;
3935 
3936 		tc = match_color(&s->colors, line);
3937 		if (tc)
3938 			wattr_on(view->window,
3939 			    COLOR_PAIR(tc->colorpair), NULL);
3940 		if (s->first_displayed_line + nprinted == s->matched_line &&
3941 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3942 			err = add_matched_line(&width, line, view->ncols, 0,
3943 			    view->window, view->x, regmatch);
3944 			if (err) {
3945 				free(line);
3946 				return err;
3947 			}
3948 		} else {
3949 			int skip;
3950 			err = format_line(&wline, &width, &skip, line,
3951 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3952 			if (err) {
3953 				free(line);
3954 				return err;
3955 			}
3956 			waddwstr(view->window, &wline[skip]);
3957 			free(wline);
3958 			wline = NULL;
3959 		}
3960 		if (tc)
3961 			wattr_off(view->window,
3962 			    COLOR_PAIR(tc->colorpair), NULL);
3963 		if (width <= view->ncols - 1)
3964 			waddch(view->window, '\n');
3965 		nprinted++;
3966 	}
3967 	free(line);
3968 	if (nprinted >= 1)
3969 		s->last_displayed_line = s->first_displayed_line +
3970 		    (nprinted - 1);
3971 	else
3972 		s->last_displayed_line = s->first_displayed_line;
3973 
3974 	view_border(view);
3975 
3976 	if (s->eof) {
3977 		while (nprinted < view->nlines) {
3978 			waddch(view->window, '\n');
3979 			nprinted++;
3980 		}
3981 
3982 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3983 		    view->ncols, 0, 0);
3984 		if (err) {
3985 			return err;
3986 		}
3987 
3988 		wstandout(view->window);
3989 		waddwstr(view->window, wline);
3990 		free(wline);
3991 		wline = NULL;
3992 		wstandend(view->window);
3993 	}
3994 
3995 	return NULL;
3996 }
3997 
3998 static char *
3999 get_datestr(time_t *time, char *datebuf)
4000 {
4001 	struct tm mytm, *tm;
4002 	char *p, *s;
4003 
4004 	tm = gmtime_r(time, &mytm);
4005 	if (tm == NULL)
4006 		return NULL;
4007 	s = asctime_r(tm, datebuf);
4008 	if (s == NULL)
4009 		return NULL;
4010 	p = strchr(s, '\n');
4011 	if (p)
4012 		*p = '\0';
4013 	return s;
4014 }
4015 
4016 static const struct got_error *
4017 get_changed_paths(struct got_pathlist_head *paths,
4018     struct got_commit_object *commit, struct got_repository *repo)
4019 {
4020 	const struct got_error *err = NULL;
4021 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4022 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4023 	struct got_object_qid *qid;
4024 
4025 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4026 	if (qid != NULL) {
4027 		struct got_commit_object *pcommit;
4028 		err = got_object_open_as_commit(&pcommit, repo,
4029 		    &qid->id);
4030 		if (err)
4031 			return err;
4032 
4033 		tree_id1 = got_object_id_dup(
4034 		    got_object_commit_get_tree_id(pcommit));
4035 		if (tree_id1 == NULL) {
4036 			got_object_commit_close(pcommit);
4037 			return got_error_from_errno("got_object_id_dup");
4038 		}
4039 		got_object_commit_close(pcommit);
4040 
4041 	}
4042 
4043 	if (tree_id1) {
4044 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4045 		if (err)
4046 			goto done;
4047 	}
4048 
4049 	tree_id2 = got_object_commit_get_tree_id(commit);
4050 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4051 	if (err)
4052 		goto done;
4053 
4054 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4055 	    got_diff_tree_collect_changed_paths, paths, 0);
4056 done:
4057 	if (tree1)
4058 		got_object_tree_close(tree1);
4059 	if (tree2)
4060 		got_object_tree_close(tree2);
4061 	free(tree_id1);
4062 	return err;
4063 }
4064 
4065 static const struct got_error *
4066 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4067 {
4068 	off_t *p;
4069 
4070 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4071 	if (p == NULL)
4072 		return got_error_from_errno("reallocarray");
4073 	*line_offsets = p;
4074 	(*line_offsets)[*nlines] = off;
4075 	(*nlines)++;
4076 	return NULL;
4077 }
4078 
4079 static const struct got_error *
4080 write_commit_info(off_t **line_offsets, size_t *nlines,
4081     struct got_object_id *commit_id, struct got_reflist_head *refs,
4082     struct got_repository *repo, FILE *outfile)
4083 {
4084 	const struct got_error *err = NULL;
4085 	char datebuf[26], *datestr;
4086 	struct got_commit_object *commit;
4087 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4088 	time_t committer_time;
4089 	const char *author, *committer;
4090 	char *refs_str = NULL;
4091 	struct got_pathlist_head changed_paths;
4092 	struct got_pathlist_entry *pe;
4093 	off_t outoff = 0;
4094 	int n;
4095 
4096 	TAILQ_INIT(&changed_paths);
4097 
4098 	if (refs) {
4099 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4100 		if (err)
4101 			return err;
4102 	}
4103 
4104 	err = got_object_open_as_commit(&commit, repo, commit_id);
4105 	if (err)
4106 		return err;
4107 
4108 	err = got_object_id_str(&id_str, commit_id);
4109 	if (err) {
4110 		err = got_error_from_errno("got_object_id_str");
4111 		goto done;
4112 	}
4113 
4114 	err = add_line_offset(line_offsets, nlines, 0);
4115 	if (err)
4116 		goto done;
4117 
4118 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4119 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4120 	if (n < 0) {
4121 		err = got_error_from_errno("fprintf");
4122 		goto done;
4123 	}
4124 	outoff += n;
4125 	err = add_line_offset(line_offsets, nlines, outoff);
4126 	if (err)
4127 		goto done;
4128 
4129 	n = fprintf(outfile, "from: %s\n",
4130 	    got_object_commit_get_author(commit));
4131 	if (n < 0) {
4132 		err = got_error_from_errno("fprintf");
4133 		goto done;
4134 	}
4135 	outoff += n;
4136 	err = add_line_offset(line_offsets, nlines, outoff);
4137 	if (err)
4138 		goto done;
4139 
4140 	committer_time = got_object_commit_get_committer_time(commit);
4141 	datestr = get_datestr(&committer_time, datebuf);
4142 	if (datestr) {
4143 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4144 		if (n < 0) {
4145 			err = got_error_from_errno("fprintf");
4146 			goto done;
4147 		}
4148 		outoff += n;
4149 		err = add_line_offset(line_offsets, nlines, outoff);
4150 		if (err)
4151 			goto done;
4152 	}
4153 	author = got_object_commit_get_author(commit);
4154 	committer = got_object_commit_get_committer(commit);
4155 	if (strcmp(author, committer) != 0) {
4156 		n = fprintf(outfile, "via: %s\n", committer);
4157 		if (n < 0) {
4158 			err = got_error_from_errno("fprintf");
4159 			goto done;
4160 		}
4161 		outoff += n;
4162 		err = add_line_offset(line_offsets, nlines, outoff);
4163 		if (err)
4164 			goto done;
4165 	}
4166 	if (got_object_commit_get_nparents(commit) > 1) {
4167 		const struct got_object_id_queue *parent_ids;
4168 		struct got_object_qid *qid;
4169 		int pn = 1;
4170 		parent_ids = got_object_commit_get_parent_ids(commit);
4171 		STAILQ_FOREACH(qid, parent_ids, entry) {
4172 			err = got_object_id_str(&id_str, &qid->id);
4173 			if (err)
4174 				goto done;
4175 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4176 			if (n < 0) {
4177 				err = got_error_from_errno("fprintf");
4178 				goto done;
4179 			}
4180 			outoff += n;
4181 			err = add_line_offset(line_offsets, nlines, outoff);
4182 			if (err)
4183 				goto done;
4184 			free(id_str);
4185 			id_str = NULL;
4186 		}
4187 	}
4188 
4189 	err = got_object_commit_get_logmsg(&logmsg, commit);
4190 	if (err)
4191 		goto done;
4192 	s = logmsg;
4193 	while ((line = strsep(&s, "\n")) != NULL) {
4194 		n = fprintf(outfile, "%s\n", line);
4195 		if (n < 0) {
4196 			err = got_error_from_errno("fprintf");
4197 			goto done;
4198 		}
4199 		outoff += n;
4200 		err = add_line_offset(line_offsets, nlines, outoff);
4201 		if (err)
4202 			goto done;
4203 	}
4204 
4205 	err = get_changed_paths(&changed_paths, commit, repo);
4206 	if (err)
4207 		goto done;
4208 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4209 		struct got_diff_changed_path *cp = pe->data;
4210 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4211 		if (n < 0) {
4212 			err = got_error_from_errno("fprintf");
4213 			goto done;
4214 		}
4215 		outoff += n;
4216 		err = add_line_offset(line_offsets, nlines, outoff);
4217 		if (err)
4218 			goto done;
4219 		free((char *)pe->path);
4220 		free(pe->data);
4221 	}
4222 
4223 	fputc('\n', outfile);
4224 	outoff++;
4225 	err = add_line_offset(line_offsets, nlines, outoff);
4226 done:
4227 	got_pathlist_free(&changed_paths);
4228 	free(id_str);
4229 	free(logmsg);
4230 	free(refs_str);
4231 	got_object_commit_close(commit);
4232 	if (err) {
4233 		free(*line_offsets);
4234 		*line_offsets = NULL;
4235 		*nlines = 0;
4236 	}
4237 	return err;
4238 }
4239 
4240 static const struct got_error *
4241 create_diff(struct tog_diff_view_state *s)
4242 {
4243 	const struct got_error *err = NULL;
4244 	FILE *f = NULL;
4245 	int obj_type;
4246 
4247 	free(s->line_offsets);
4248 	s->line_offsets = malloc(sizeof(off_t));
4249 	if (s->line_offsets == NULL)
4250 		return got_error_from_errno("malloc");
4251 	s->nlines = 0;
4252 
4253 	f = got_opentemp();
4254 	if (f == NULL) {
4255 		err = got_error_from_errno("got_opentemp");
4256 		goto done;
4257 	}
4258 	if (s->f && fclose(s->f) == EOF) {
4259 		err = got_error_from_errno("fclose");
4260 		goto done;
4261 	}
4262 	s->f = f;
4263 
4264 	if (s->id1)
4265 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4266 	else
4267 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4268 	if (err)
4269 		goto done;
4270 
4271 	switch (obj_type) {
4272 	case GOT_OBJ_TYPE_BLOB:
4273 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4274 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4275 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4276 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4277 		break;
4278 	case GOT_OBJ_TYPE_TREE:
4279 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4280 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4281 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4282 		    s->force_text_diff, s->repo, s->f);
4283 		break;
4284 	case GOT_OBJ_TYPE_COMMIT: {
4285 		const struct got_object_id_queue *parent_ids;
4286 		struct got_object_qid *pid;
4287 		struct got_commit_object *commit2;
4288 		struct got_reflist_head *refs;
4289 
4290 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4291 		if (err)
4292 			goto done;
4293 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4294 		/* Show commit info if we're diffing to a parent/root commit. */
4295 		if (s->id1 == NULL) {
4296 			err = write_commit_info(&s->line_offsets, &s->nlines,
4297 			    s->id2, refs, s->repo, s->f);
4298 			if (err)
4299 				goto done;
4300 		} else {
4301 			parent_ids = got_object_commit_get_parent_ids(commit2);
4302 			STAILQ_FOREACH(pid, parent_ids, entry) {
4303 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4304 					err = write_commit_info(
4305 					    &s->line_offsets, &s->nlines,
4306 					    s->id2, refs, s->repo, s->f);
4307 					if (err)
4308 						goto done;
4309 					break;
4310 				}
4311 			}
4312 		}
4313 		got_object_commit_close(commit2);
4314 
4315 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4316 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4317 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4318 		    s->force_text_diff, s->repo, s->f);
4319 		break;
4320 	}
4321 	default:
4322 		err = got_error(GOT_ERR_OBJ_TYPE);
4323 		break;
4324 	}
4325 	if (err)
4326 		goto done;
4327 done:
4328 	if (s->f && fflush(s->f) != 0 && err == NULL)
4329 		err = got_error_from_errno("fflush");
4330 	return err;
4331 }
4332 
4333 static void
4334 diff_view_indicate_progress(struct tog_view *view)
4335 {
4336 	mvwaddstr(view->window, 0, 0, "diffing...");
4337 	update_panels();
4338 	doupdate();
4339 }
4340 
4341 static const struct got_error *
4342 search_start_diff_view(struct tog_view *view)
4343 {
4344 	struct tog_diff_view_state *s = &view->state.diff;
4345 
4346 	s->matched_line = 0;
4347 	return NULL;
4348 }
4349 
4350 static const struct got_error *
4351 search_next_diff_view(struct tog_view *view)
4352 {
4353 	struct tog_diff_view_state *s = &view->state.diff;
4354 	const struct got_error *err = NULL;
4355 	int lineno;
4356 	char *line = NULL;
4357 	size_t linesize = 0;
4358 	ssize_t linelen;
4359 
4360 	if (!view->searching) {
4361 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4362 		return NULL;
4363 	}
4364 
4365 	if (s->matched_line) {
4366 		if (view->searching == TOG_SEARCH_FORWARD)
4367 			lineno = s->matched_line + 1;
4368 		else
4369 			lineno = s->matched_line - 1;
4370 	} else
4371 		lineno = s->first_displayed_line;
4372 
4373 	while (1) {
4374 		off_t offset;
4375 
4376 		if (lineno <= 0 || lineno > s->nlines) {
4377 			if (s->matched_line == 0) {
4378 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4379 				break;
4380 			}
4381 
4382 			if (view->searching == TOG_SEARCH_FORWARD)
4383 				lineno = 1;
4384 			else
4385 				lineno = s->nlines;
4386 		}
4387 
4388 		offset = s->line_offsets[lineno - 1];
4389 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4390 			free(line);
4391 			return got_error_from_errno("fseeko");
4392 		}
4393 		linelen = getline(&line, &linesize, s->f);
4394 		if (linelen != -1) {
4395 			char *exstr;
4396 			err = expand_tab(&exstr, line);
4397 			if (err)
4398 				break;
4399 			if (match_line(exstr, &view->regex, 1,
4400 			    &view->regmatch)) {
4401 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4402 				s->matched_line = lineno;
4403 				free(exstr);
4404 				break;
4405 			}
4406 			free(exstr);
4407 		}
4408 		if (view->searching == TOG_SEARCH_FORWARD)
4409 			lineno++;
4410 		else
4411 			lineno--;
4412 	}
4413 	free(line);
4414 
4415 	if (s->matched_line) {
4416 		s->first_displayed_line = s->matched_line;
4417 		s->selected_line = 1;
4418 	}
4419 
4420 	return err;
4421 }
4422 
4423 static const struct got_error *
4424 close_diff_view(struct tog_view *view)
4425 {
4426 	const struct got_error *err = NULL;
4427 	struct tog_diff_view_state *s = &view->state.diff;
4428 
4429 	free(s->id1);
4430 	s->id1 = NULL;
4431 	free(s->id2);
4432 	s->id2 = NULL;
4433 	if (s->f && fclose(s->f) == EOF)
4434 		err = got_error_from_errno("fclose");
4435 	s->f = NULL;
4436 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4437 		err = got_error_from_errno("fclose");
4438 	s->f1 = NULL;
4439 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4440 		err = got_error_from_errno("fclose");
4441 	s->f2 = NULL;
4442 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4443 		err = got_error_from_errno("close");
4444 	s->fd1 = -1;
4445 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4446 		err = got_error_from_errno("close");
4447 	s->fd2 = -1;
4448 	free_colors(&s->colors);
4449 	free(s->line_offsets);
4450 	s->line_offsets = NULL;
4451 	s->nlines = 0;
4452 	return err;
4453 }
4454 
4455 static const struct got_error *
4456 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4457     struct got_object_id *id2, const char *label1, const char *label2,
4458     int diff_context, int ignore_whitespace, int force_text_diff,
4459     struct tog_view *parent_view, struct got_repository *repo)
4460 {
4461 	const struct got_error *err;
4462 	struct tog_diff_view_state *s = &view->state.diff;
4463 
4464 	memset(s, 0, sizeof(*s));
4465 	s->fd1 = -1;
4466 	s->fd2 = -1;
4467 
4468 	if (id1 != NULL && id2 != NULL) {
4469 	    int type1, type2;
4470 	    err = got_object_get_type(&type1, repo, id1);
4471 	    if (err)
4472 		return err;
4473 	    err = got_object_get_type(&type2, repo, id2);
4474 	    if (err)
4475 		return err;
4476 
4477 	    if (type1 != type2)
4478 		return got_error(GOT_ERR_OBJ_TYPE);
4479 	}
4480 	s->first_displayed_line = 1;
4481 	s->last_displayed_line = view->nlines;
4482 	s->selected_line = 1;
4483 	s->repo = repo;
4484 	s->id1 = id1;
4485 	s->id2 = id2;
4486 	s->label1 = label1;
4487 	s->label2 = label2;
4488 
4489 	if (id1) {
4490 		s->id1 = got_object_id_dup(id1);
4491 		if (s->id1 == NULL)
4492 			return got_error_from_errno("got_object_id_dup");
4493 	} else
4494 		s->id1 = NULL;
4495 
4496 	s->id2 = got_object_id_dup(id2);
4497 	if (s->id2 == NULL) {
4498 		err = got_error_from_errno("got_object_id_dup");
4499 		goto done;
4500 	}
4501 
4502 	s->f1 = got_opentemp();
4503 	if (s->f1 == NULL) {
4504 		err = got_error_from_errno("got_opentemp");
4505 		goto done;
4506 	}
4507 
4508 	s->f2 = got_opentemp();
4509 	if (s->f2 == NULL) {
4510 		err = got_error_from_errno("got_opentemp");
4511 		goto done;
4512 	}
4513 
4514 	s->fd1 = got_opentempfd();
4515 	if (s->fd1 == -1) {
4516 		err = got_error_from_errno("got_opentempfd");
4517 		goto done;
4518 	}
4519 
4520 	s->fd2 = got_opentempfd();
4521 	if (s->fd2 == -1) {
4522 		err = got_error_from_errno("got_opentempfd");
4523 		goto done;
4524 	}
4525 
4526 	s->first_displayed_line = 1;
4527 	s->last_displayed_line = view->nlines;
4528 	s->diff_context = diff_context;
4529 	s->ignore_whitespace = ignore_whitespace;
4530 	s->force_text_diff = force_text_diff;
4531 	s->parent_view = parent_view;
4532 	s->repo = repo;
4533 
4534 	STAILQ_INIT(&s->colors);
4535 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4536 		err = add_color(&s->colors,
4537 		    "^-", TOG_COLOR_DIFF_MINUS,
4538 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4539 		if (err)
4540 			goto done;
4541 		err = add_color(&s->colors, "^\\+",
4542 		    TOG_COLOR_DIFF_PLUS,
4543 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4544 		if (err)
4545 			goto done;
4546 		err = add_color(&s->colors,
4547 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4548 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4549 		if (err)
4550 			goto done;
4551 
4552 		err = add_color(&s->colors,
4553 		    "^(commit [0-9a-f]|parent [0-9]|"
4554 		    "(blob|file|tree|commit) [-+] |"
4555 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4556 		    get_color_value("TOG_COLOR_DIFF_META"));
4557 		if (err)
4558 			goto done;
4559 
4560 		err = add_color(&s->colors,
4561 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4562 		    get_color_value("TOG_COLOR_AUTHOR"));
4563 		if (err)
4564 			goto done;
4565 
4566 		err = add_color(&s->colors,
4567 		    "^date: ", TOG_COLOR_DATE,
4568 		    get_color_value("TOG_COLOR_DATE"));
4569 		if (err)
4570 			goto done;
4571 	}
4572 
4573 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4574 	    view_is_splitscreen(view))
4575 		show_log_view(parent_view); /* draw border */
4576 	diff_view_indicate_progress(view);
4577 
4578 	err = create_diff(s);
4579 
4580 	view->show = show_diff_view;
4581 	view->input = input_diff_view;
4582 	view->reset = reset_diff_view;
4583 	view->close = close_diff_view;
4584 	view->search_start = search_start_diff_view;
4585 	view->search_next = search_next_diff_view;
4586 done:
4587 	if (err)
4588 		close_diff_view(view);
4589 	return err;
4590 }
4591 
4592 static const struct got_error *
4593 show_diff_view(struct tog_view *view)
4594 {
4595 	const struct got_error *err;
4596 	struct tog_diff_view_state *s = &view->state.diff;
4597 	char *id_str1 = NULL, *id_str2, *header;
4598 	const char *label1, *label2;
4599 
4600 	if (s->id1) {
4601 		err = got_object_id_str(&id_str1, s->id1);
4602 		if (err)
4603 			return err;
4604 		label1 = s->label1 ? : id_str1;
4605 	} else
4606 		label1 = "/dev/null";
4607 
4608 	err = got_object_id_str(&id_str2, s->id2);
4609 	if (err)
4610 		return err;
4611 	label2 = s->label2 ? : id_str2;
4612 
4613 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4614 		err = got_error_from_errno("asprintf");
4615 		free(id_str1);
4616 		free(id_str2);
4617 		return err;
4618 	}
4619 	free(id_str1);
4620 	free(id_str2);
4621 
4622 	err = draw_file(view, header);
4623 	free(header);
4624 	return err;
4625 }
4626 
4627 static const struct got_error *
4628 set_selected_commit(struct tog_diff_view_state *s,
4629     struct commit_queue_entry *entry)
4630 {
4631 	const struct got_error *err;
4632 	const struct got_object_id_queue *parent_ids;
4633 	struct got_commit_object *selected_commit;
4634 	struct got_object_qid *pid;
4635 
4636 	free(s->id2);
4637 	s->id2 = got_object_id_dup(entry->id);
4638 	if (s->id2 == NULL)
4639 		return got_error_from_errno("got_object_id_dup");
4640 
4641 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4642 	if (err)
4643 		return err;
4644 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4645 	free(s->id1);
4646 	pid = STAILQ_FIRST(parent_ids);
4647 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4648 	got_object_commit_close(selected_commit);
4649 	return NULL;
4650 }
4651 
4652 static const struct got_error *
4653 reset_diff_view(struct tog_view *view)
4654 {
4655 	struct tog_diff_view_state *s = &view->state.diff;
4656 
4657 	view->count = 0;
4658 	wclear(view->window);
4659 	s->first_displayed_line = 1;
4660 	s->last_displayed_line = view->nlines;
4661 	s->matched_line = 0;
4662 	diff_view_indicate_progress(view);
4663 	return create_diff(s);
4664 }
4665 
4666 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4667     int, int, int);
4668 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4669     int, int);
4670 
4671 static const struct got_error *
4672 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4673 {
4674 	const struct got_error *err = NULL;
4675 	struct tog_diff_view_state *s = &view->state.diff;
4676 	struct tog_log_view_state *ls;
4677 	struct commit_queue_entry *old_selected_entry;
4678 	char *line = NULL;
4679 	size_t linesize = 0;
4680 	ssize_t linelen;
4681 	int i, nscroll = view->nlines - 1, up = 0;
4682 
4683 	switch (ch) {
4684 	case '0':
4685 		view->x = 0;
4686 		break;
4687 	case '$':
4688 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4689 		view->count = 0;
4690 		break;
4691 	case KEY_RIGHT:
4692 	case 'l':
4693 		if (view->x + view->ncols / 3 < view->maxx)
4694 			view->x += 2;  /* move two columns right */
4695 		else
4696 			view->count = 0;
4697 		break;
4698 	case KEY_LEFT:
4699 	case 'h':
4700 		view->x -= MIN(view->x, 2);  /* move two columns back */
4701 		if (view->x <= 0)
4702 			view->count = 0;
4703 		break;
4704 	case 'a':
4705 	case 'w':
4706 		if (ch == 'a')
4707 			s->force_text_diff = !s->force_text_diff;
4708 		if (ch == 'w')
4709 			s->ignore_whitespace = !s->ignore_whitespace;
4710 		err = reset_diff_view(view);
4711 		break;
4712 	case 'g':
4713 	case KEY_HOME:
4714 		s->first_displayed_line = 1;
4715 		view->count = 0;
4716 		break;
4717 	case 'G':
4718 	case KEY_END:
4719 		view->count = 0;
4720 		if (s->eof)
4721 			break;
4722 
4723 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4724 		s->eof = 1;
4725 		break;
4726 	case 'k':
4727 	case KEY_UP:
4728 	case CTRL('p'):
4729 		if (s->first_displayed_line > 1)
4730 			s->first_displayed_line--;
4731 		else
4732 			view->count = 0;
4733 		break;
4734 	case CTRL('u'):
4735 	case 'u':
4736 		nscroll /= 2;
4737 		/* FALL THROUGH */
4738 	case KEY_PPAGE:
4739 	case CTRL('b'):
4740 	case 'b':
4741 		if (s->first_displayed_line == 1) {
4742 			view->count = 0;
4743 			break;
4744 		}
4745 		i = 0;
4746 		while (i++ < nscroll && s->first_displayed_line > 1)
4747 			s->first_displayed_line--;
4748 		break;
4749 	case 'j':
4750 	case KEY_DOWN:
4751 	case CTRL('n'):
4752 		if (!s->eof)
4753 			s->first_displayed_line++;
4754 		else
4755 			view->count = 0;
4756 		break;
4757 	case CTRL('d'):
4758 	case 'd':
4759 		nscroll /= 2;
4760 		/* FALL THROUGH */
4761 	case KEY_NPAGE:
4762 	case CTRL('f'):
4763 	case 'f':
4764 	case ' ':
4765 		if (s->eof) {
4766 			view->count = 0;
4767 			break;
4768 		}
4769 		i = 0;
4770 		while (!s->eof && i++ < nscroll) {
4771 			linelen = getline(&line, &linesize, s->f);
4772 			s->first_displayed_line++;
4773 			if (linelen == -1) {
4774 				if (feof(s->f)) {
4775 					s->eof = 1;
4776 				} else
4777 					err = got_ferror(s->f, GOT_ERR_IO);
4778 				break;
4779 			}
4780 		}
4781 		free(line);
4782 		break;
4783 	case '[':
4784 		if (s->diff_context > 0) {
4785 			s->diff_context--;
4786 			s->matched_line = 0;
4787 			diff_view_indicate_progress(view);
4788 			err = create_diff(s);
4789 			if (s->first_displayed_line + view->nlines - 1 >
4790 			    s->nlines) {
4791 				s->first_displayed_line = 1;
4792 				s->last_displayed_line = view->nlines;
4793 			}
4794 		} else
4795 			view->count = 0;
4796 		break;
4797 	case ']':
4798 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4799 			s->diff_context++;
4800 			s->matched_line = 0;
4801 			diff_view_indicate_progress(view);
4802 			err = create_diff(s);
4803 		} else
4804 			view->count = 0;
4805 		break;
4806 	case '<':
4807 	case ',':
4808 		up = 1;
4809 		/* FALL THROUGH */
4810 	case '>':
4811 	case '.':
4812 		if (s->parent_view == NULL) {
4813 			view->count = 0;
4814 			break;
4815 		}
4816 		s->parent_view->count = view->count;
4817 
4818 		if (s->parent_view->type == TOG_VIEW_LOG) {
4819 			ls = &s->parent_view->state.log;
4820 			old_selected_entry = ls->selected_entry;
4821 
4822 			err = input_log_view(NULL, s->parent_view,
4823 			    up ? KEY_UP : KEY_DOWN);
4824 			if (err)
4825 				break;
4826 			view->count = s->parent_view->count;
4827 
4828 			if (old_selected_entry == ls->selected_entry)
4829 				break;
4830 
4831 			err = set_selected_commit(s, ls->selected_entry);
4832 			if (err)
4833 				break;
4834 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4835 			struct tog_blame_view_state *bs;
4836 			struct got_object_id *id, *prev_id;
4837 
4838 			bs = &s->parent_view->state.blame;
4839 			prev_id = get_annotation_for_line(bs->blame.lines,
4840 			    bs->blame.nlines, bs->last_diffed_line);
4841 
4842 			err = input_blame_view(&view, s->parent_view,
4843 			    up ? KEY_UP : KEY_DOWN);
4844 			if (err)
4845 				break;
4846 			view->count = s->parent_view->count;
4847 
4848 			if (prev_id == NULL)
4849 				break;
4850 			id = get_selected_commit_id(bs->blame.lines,
4851 			    bs->blame.nlines, bs->first_displayed_line,
4852 			    bs->selected_line);
4853 			if (id == NULL)
4854 				break;
4855 
4856 			if (!got_object_id_cmp(prev_id, id))
4857 				break;
4858 
4859 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4860 			if (err)
4861 				break;
4862 		}
4863 		s->first_displayed_line = 1;
4864 		s->last_displayed_line = view->nlines;
4865 		s->matched_line = 0;
4866 		view->x = 0;
4867 
4868 		diff_view_indicate_progress(view);
4869 		err = create_diff(s);
4870 		break;
4871 	default:
4872 		view->count = 0;
4873 		break;
4874 	}
4875 
4876 	return err;
4877 }
4878 
4879 static const struct got_error *
4880 cmd_diff(int argc, char *argv[])
4881 {
4882 	const struct got_error *error = NULL;
4883 	struct got_repository *repo = NULL;
4884 	struct got_worktree *worktree = NULL;
4885 	struct got_object_id *id1 = NULL, *id2 = NULL;
4886 	char *repo_path = NULL, *cwd = NULL;
4887 	char *id_str1 = NULL, *id_str2 = NULL;
4888 	char *label1 = NULL, *label2 = NULL;
4889 	int diff_context = 3, ignore_whitespace = 0;
4890 	int ch, force_text_diff = 0;
4891 	const char *errstr;
4892 	struct tog_view *view;
4893 	int *pack_fds = NULL;
4894 
4895 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4896 		switch (ch) {
4897 		case 'a':
4898 			force_text_diff = 1;
4899 			break;
4900 		case 'C':
4901 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4902 			    &errstr);
4903 			if (errstr != NULL)
4904 				errx(1, "number of context lines is %s: %s",
4905 				    errstr, errstr);
4906 			break;
4907 		case 'r':
4908 			repo_path = realpath(optarg, NULL);
4909 			if (repo_path == NULL)
4910 				return got_error_from_errno2("realpath",
4911 				    optarg);
4912 			got_path_strip_trailing_slashes(repo_path);
4913 			break;
4914 		case 'w':
4915 			ignore_whitespace = 1;
4916 			break;
4917 		default:
4918 			usage_diff();
4919 			/* NOTREACHED */
4920 		}
4921 	}
4922 
4923 	argc -= optind;
4924 	argv += optind;
4925 
4926 	if (argc == 0) {
4927 		usage_diff(); /* TODO show local worktree changes */
4928 	} else if (argc == 2) {
4929 		id_str1 = argv[0];
4930 		id_str2 = argv[1];
4931 	} else
4932 		usage_diff();
4933 
4934 	error = got_repo_pack_fds_open(&pack_fds);
4935 	if (error)
4936 		goto done;
4937 
4938 	if (repo_path == NULL) {
4939 		cwd = getcwd(NULL, 0);
4940 		if (cwd == NULL)
4941 			return got_error_from_errno("getcwd");
4942 		error = got_worktree_open(&worktree, cwd);
4943 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4944 			goto done;
4945 		if (worktree)
4946 			repo_path =
4947 			    strdup(got_worktree_get_repo_path(worktree));
4948 		else
4949 			repo_path = strdup(cwd);
4950 		if (repo_path == NULL) {
4951 			error = got_error_from_errno("strdup");
4952 			goto done;
4953 		}
4954 	}
4955 
4956 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4957 	if (error)
4958 		goto done;
4959 
4960 	init_curses();
4961 
4962 	error = apply_unveil(got_repo_get_path(repo), NULL);
4963 	if (error)
4964 		goto done;
4965 
4966 	error = tog_load_refs(repo, 0);
4967 	if (error)
4968 		goto done;
4969 
4970 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4971 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4972 	if (error)
4973 		goto done;
4974 
4975 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4976 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4977 	if (error)
4978 		goto done;
4979 
4980 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4981 	if (view == NULL) {
4982 		error = got_error_from_errno("view_open");
4983 		goto done;
4984 	}
4985 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4986 	    ignore_whitespace, force_text_diff, NULL,  repo);
4987 	if (error)
4988 		goto done;
4989 	error = view_loop(view);
4990 done:
4991 	free(label1);
4992 	free(label2);
4993 	free(repo_path);
4994 	free(cwd);
4995 	if (repo) {
4996 		const struct got_error *close_err = got_repo_close(repo);
4997 		if (error == NULL)
4998 			error = close_err;
4999 	}
5000 	if (worktree)
5001 		got_worktree_close(worktree);
5002 	if (pack_fds) {
5003 		const struct got_error *pack_err =
5004 		    got_repo_pack_fds_close(pack_fds);
5005 		if (error == NULL)
5006 			error = pack_err;
5007 	}
5008 	tog_free_refs();
5009 	return error;
5010 }
5011 
5012 __dead static void
5013 usage_blame(void)
5014 {
5015 	endwin();
5016 	fprintf(stderr,
5017 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5018 	    getprogname());
5019 	exit(1);
5020 }
5021 
5022 struct tog_blame_line {
5023 	int annotated;
5024 	struct got_object_id *id;
5025 };
5026 
5027 static const struct got_error *
5028 draw_blame(struct tog_view *view)
5029 {
5030 	struct tog_blame_view_state *s = &view->state.blame;
5031 	struct tog_blame *blame = &s->blame;
5032 	regmatch_t *regmatch = &view->regmatch;
5033 	const struct got_error *err;
5034 	int lineno = 0, nprinted = 0;
5035 	char *line = NULL;
5036 	size_t linesize = 0;
5037 	ssize_t linelen;
5038 	wchar_t *wline;
5039 	int width;
5040 	struct tog_blame_line *blame_line;
5041 	struct got_object_id *prev_id = NULL;
5042 	char *id_str;
5043 	struct tog_color *tc;
5044 
5045 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5046 	if (err)
5047 		return err;
5048 
5049 	rewind(blame->f);
5050 	werase(view->window);
5051 
5052 	if (asprintf(&line, "commit %s", id_str) == -1) {
5053 		err = got_error_from_errno("asprintf");
5054 		free(id_str);
5055 		return err;
5056 	}
5057 
5058 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5059 	free(line);
5060 	line = NULL;
5061 	if (err)
5062 		return err;
5063 	if (view_needs_focus_indication(view))
5064 		wstandout(view->window);
5065 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5066 	if (tc)
5067 		wattr_on(view->window,
5068 		    COLOR_PAIR(tc->colorpair), NULL);
5069 	waddwstr(view->window, wline);
5070 	if (tc)
5071 		wattr_off(view->window,
5072 		    COLOR_PAIR(tc->colorpair), NULL);
5073 	if (view_needs_focus_indication(view))
5074 		wstandend(view->window);
5075 	free(wline);
5076 	wline = NULL;
5077 	if (width < view->ncols - 1)
5078 		waddch(view->window, '\n');
5079 
5080 	if (asprintf(&line, "[%d/%d] %s%s",
5081 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5082 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5083 		free(id_str);
5084 		return got_error_from_errno("asprintf");
5085 	}
5086 	free(id_str);
5087 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5088 	free(line);
5089 	line = NULL;
5090 	if (err)
5091 		return err;
5092 	waddwstr(view->window, wline);
5093 	free(wline);
5094 	wline = NULL;
5095 	if (width < view->ncols - 1)
5096 		waddch(view->window, '\n');
5097 
5098 	s->eof = 0;
5099 	view->maxx = 0;
5100 	while (nprinted < view->nlines - 2) {
5101 		linelen = getline(&line, &linesize, blame->f);
5102 		if (linelen == -1) {
5103 			if (feof(blame->f)) {
5104 				s->eof = 1;
5105 				break;
5106 			}
5107 			free(line);
5108 			return got_ferror(blame->f, GOT_ERR_IO);
5109 		}
5110 		if (++lineno < s->first_displayed_line)
5111 			continue;
5112 
5113 		/* Set view->maxx based on full line length. */
5114 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5115 		if (err) {
5116 			free(line);
5117 			return err;
5118 		}
5119 		free(wline);
5120 		wline = NULL;
5121 		view->maxx = MAX(view->maxx, width);
5122 
5123 		if (nprinted == s->selected_line - 1)
5124 			wstandout(view->window);
5125 
5126 		if (blame->nlines > 0) {
5127 			blame_line = &blame->lines[lineno - 1];
5128 			if (blame_line->annotated && prev_id &&
5129 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5130 			    !(nprinted == s->selected_line - 1)) {
5131 				waddstr(view->window, "        ");
5132 			} else if (blame_line->annotated) {
5133 				char *id_str;
5134 				err = got_object_id_str(&id_str,
5135 				    blame_line->id);
5136 				if (err) {
5137 					free(line);
5138 					return err;
5139 				}
5140 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5141 				if (tc)
5142 					wattr_on(view->window,
5143 					    COLOR_PAIR(tc->colorpair), NULL);
5144 				wprintw(view->window, "%.8s", id_str);
5145 				if (tc)
5146 					wattr_off(view->window,
5147 					    COLOR_PAIR(tc->colorpair), NULL);
5148 				free(id_str);
5149 				prev_id = blame_line->id;
5150 			} else {
5151 				waddstr(view->window, "........");
5152 				prev_id = NULL;
5153 			}
5154 		} else {
5155 			waddstr(view->window, "........");
5156 			prev_id = NULL;
5157 		}
5158 
5159 		if (nprinted == s->selected_line - 1)
5160 			wstandend(view->window);
5161 		waddstr(view->window, " ");
5162 
5163 		if (view->ncols <= 9) {
5164 			width = 9;
5165 		} else if (s->first_displayed_line + nprinted ==
5166 		    s->matched_line &&
5167 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5168 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5169 			    view->window, view->x, regmatch);
5170 			if (err) {
5171 				free(line);
5172 				return err;
5173 			}
5174 			width += 9;
5175 		} else {
5176 			int skip;
5177 			err = format_line(&wline, &width, &skip, line,
5178 			    view->x, view->ncols - 9, 9, 1);
5179 			if (err) {
5180 				free(line);
5181 				return err;
5182 			}
5183 			waddwstr(view->window, &wline[skip]);
5184 			width += 9;
5185 			free(wline);
5186 			wline = NULL;
5187 		}
5188 
5189 		if (width <= view->ncols - 1)
5190 			waddch(view->window, '\n');
5191 		if (++nprinted == 1)
5192 			s->first_displayed_line = lineno;
5193 	}
5194 	free(line);
5195 	s->last_displayed_line = lineno;
5196 
5197 	view_border(view);
5198 
5199 	return NULL;
5200 }
5201 
5202 static const struct got_error *
5203 blame_cb(void *arg, int nlines, int lineno,
5204     struct got_commit_object *commit, struct got_object_id *id)
5205 {
5206 	const struct got_error *err = NULL;
5207 	struct tog_blame_cb_args *a = arg;
5208 	struct tog_blame_line *line;
5209 	int errcode;
5210 
5211 	if (nlines != a->nlines ||
5212 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5213 		return got_error(GOT_ERR_RANGE);
5214 
5215 	errcode = pthread_mutex_lock(&tog_mutex);
5216 	if (errcode)
5217 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5218 
5219 	if (*a->quit) {	/* user has quit the blame view */
5220 		err = got_error(GOT_ERR_ITER_COMPLETED);
5221 		goto done;
5222 	}
5223 
5224 	if (lineno == -1)
5225 		goto done; /* no change in this commit */
5226 
5227 	line = &a->lines[lineno - 1];
5228 	if (line->annotated)
5229 		goto done;
5230 
5231 	line->id = got_object_id_dup(id);
5232 	if (line->id == NULL) {
5233 		err = got_error_from_errno("got_object_id_dup");
5234 		goto done;
5235 	}
5236 	line->annotated = 1;
5237 done:
5238 	errcode = pthread_mutex_unlock(&tog_mutex);
5239 	if (errcode)
5240 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5241 	return err;
5242 }
5243 
5244 static void *
5245 blame_thread(void *arg)
5246 {
5247 	const struct got_error *err, *close_err;
5248 	struct tog_blame_thread_args *ta = arg;
5249 	struct tog_blame_cb_args *a = ta->cb_args;
5250 	int errcode, fd1 = -1, fd2 = -1;
5251 	FILE *f1 = NULL, *f2 = NULL;
5252 
5253 	fd1 = got_opentempfd();
5254 	if (fd1 == -1)
5255 		return (void *)got_error_from_errno("got_opentempfd");
5256 
5257 	fd2 = got_opentempfd();
5258 	if (fd2 == -1) {
5259 		err = got_error_from_errno("got_opentempfd");
5260 		goto done;
5261 	}
5262 
5263 	f1 = got_opentemp();
5264 	if (f1 == NULL) {
5265 		err = (void *)got_error_from_errno("got_opentemp");
5266 		goto done;
5267 	}
5268 	f2 = got_opentemp();
5269 	if (f2 == NULL) {
5270 		err = (void *)got_error_from_errno("got_opentemp");
5271 		goto done;
5272 	}
5273 
5274 	err = block_signals_used_by_main_thread();
5275 	if (err)
5276 		goto done;
5277 
5278 	err = got_blame(ta->path, a->commit_id, ta->repo,
5279 	    tog_diff_algo, blame_cb, ta->cb_args,
5280 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5281 	if (err && err->code == GOT_ERR_CANCELLED)
5282 		err = NULL;
5283 
5284 	errcode = pthread_mutex_lock(&tog_mutex);
5285 	if (errcode) {
5286 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5287 		goto done;
5288 	}
5289 
5290 	close_err = got_repo_close(ta->repo);
5291 	if (err == NULL)
5292 		err = close_err;
5293 	ta->repo = NULL;
5294 	*ta->complete = 1;
5295 
5296 	errcode = pthread_mutex_unlock(&tog_mutex);
5297 	if (errcode && err == NULL)
5298 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5299 
5300 done:
5301 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5302 		err = got_error_from_errno("close");
5303 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5304 		err = got_error_from_errno("close");
5305 	if (f1 && fclose(f1) == EOF && err == NULL)
5306 		err = got_error_from_errno("fclose");
5307 	if (f2 && fclose(f2) == EOF && err == NULL)
5308 		err = got_error_from_errno("fclose");
5309 
5310 	return (void *)err;
5311 }
5312 
5313 static struct got_object_id *
5314 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5315     int first_displayed_line, int selected_line)
5316 {
5317 	struct tog_blame_line *line;
5318 
5319 	if (nlines <= 0)
5320 		return NULL;
5321 
5322 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5323 	if (!line->annotated)
5324 		return NULL;
5325 
5326 	return line->id;
5327 }
5328 
5329 static struct got_object_id *
5330 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5331     int lineno)
5332 {
5333 	struct tog_blame_line *line;
5334 
5335 	if (nlines <= 0 || lineno >= nlines)
5336 		return NULL;
5337 
5338 	line = &lines[lineno - 1];
5339 	if (!line->annotated)
5340 		return NULL;
5341 
5342 	return line->id;
5343 }
5344 
5345 static const struct got_error *
5346 stop_blame(struct tog_blame *blame)
5347 {
5348 	const struct got_error *err = NULL;
5349 	int i;
5350 
5351 	if (blame->thread) {
5352 		int errcode;
5353 		errcode = pthread_mutex_unlock(&tog_mutex);
5354 		if (errcode)
5355 			return got_error_set_errno(errcode,
5356 			    "pthread_mutex_unlock");
5357 		errcode = pthread_join(blame->thread, (void **)&err);
5358 		if (errcode)
5359 			return got_error_set_errno(errcode, "pthread_join");
5360 		errcode = pthread_mutex_lock(&tog_mutex);
5361 		if (errcode)
5362 			return got_error_set_errno(errcode,
5363 			    "pthread_mutex_lock");
5364 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5365 			err = NULL;
5366 		blame->thread = NULL;
5367 	}
5368 	if (blame->thread_args.repo) {
5369 		const struct got_error *close_err;
5370 		close_err = got_repo_close(blame->thread_args.repo);
5371 		if (err == NULL)
5372 			err = close_err;
5373 		blame->thread_args.repo = NULL;
5374 	}
5375 	if (blame->f) {
5376 		if (fclose(blame->f) == EOF && err == NULL)
5377 			err = got_error_from_errno("fclose");
5378 		blame->f = NULL;
5379 	}
5380 	if (blame->lines) {
5381 		for (i = 0; i < blame->nlines; i++)
5382 			free(blame->lines[i].id);
5383 		free(blame->lines);
5384 		blame->lines = NULL;
5385 	}
5386 	free(blame->cb_args.commit_id);
5387 	blame->cb_args.commit_id = NULL;
5388 	if (blame->pack_fds) {
5389 		const struct got_error *pack_err =
5390 		    got_repo_pack_fds_close(blame->pack_fds);
5391 		if (err == NULL)
5392 			err = pack_err;
5393 		blame->pack_fds = NULL;
5394 	}
5395 	return err;
5396 }
5397 
5398 static const struct got_error *
5399 cancel_blame_view(void *arg)
5400 {
5401 	const struct got_error *err = NULL;
5402 	int *done = arg;
5403 	int errcode;
5404 
5405 	errcode = pthread_mutex_lock(&tog_mutex);
5406 	if (errcode)
5407 		return got_error_set_errno(errcode,
5408 		    "pthread_mutex_unlock");
5409 
5410 	if (*done)
5411 		err = got_error(GOT_ERR_CANCELLED);
5412 
5413 	errcode = pthread_mutex_unlock(&tog_mutex);
5414 	if (errcode)
5415 		return got_error_set_errno(errcode,
5416 		    "pthread_mutex_lock");
5417 
5418 	return err;
5419 }
5420 
5421 static const struct got_error *
5422 run_blame(struct tog_view *view)
5423 {
5424 	struct tog_blame_view_state *s = &view->state.blame;
5425 	struct tog_blame *blame = &s->blame;
5426 	const struct got_error *err = NULL;
5427 	struct got_commit_object *commit = NULL;
5428 	struct got_blob_object *blob = NULL;
5429 	struct got_repository *thread_repo = NULL;
5430 	struct got_object_id *obj_id = NULL;
5431 	int obj_type, fd = -1;
5432 	int *pack_fds = NULL;
5433 
5434 	err = got_object_open_as_commit(&commit, s->repo,
5435 	    &s->blamed_commit->id);
5436 	if (err)
5437 		return err;
5438 
5439 	fd = got_opentempfd();
5440 	if (fd == -1) {
5441 		err = got_error_from_errno("got_opentempfd");
5442 		goto done;
5443 	}
5444 
5445 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5446 	if (err)
5447 		goto done;
5448 
5449 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5450 	if (err)
5451 		goto done;
5452 
5453 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5454 		err = got_error(GOT_ERR_OBJ_TYPE);
5455 		goto done;
5456 	}
5457 
5458 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5459 	if (err)
5460 		goto done;
5461 	blame->f = got_opentemp();
5462 	if (blame->f == NULL) {
5463 		err = got_error_from_errno("got_opentemp");
5464 		goto done;
5465 	}
5466 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5467 	    &blame->line_offsets, blame->f, blob);
5468 	if (err)
5469 		goto done;
5470 	if (blame->nlines == 0) {
5471 		s->blame_complete = 1;
5472 		goto done;
5473 	}
5474 
5475 	/* Don't include \n at EOF in the blame line count. */
5476 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5477 		blame->nlines--;
5478 
5479 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5480 	if (blame->lines == NULL) {
5481 		err = got_error_from_errno("calloc");
5482 		goto done;
5483 	}
5484 
5485 	err = got_repo_pack_fds_open(&pack_fds);
5486 	if (err)
5487 		goto done;
5488 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5489 	    pack_fds);
5490 	if (err)
5491 		goto done;
5492 
5493 	blame->pack_fds = pack_fds;
5494 	blame->cb_args.view = view;
5495 	blame->cb_args.lines = blame->lines;
5496 	blame->cb_args.nlines = blame->nlines;
5497 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5498 	if (blame->cb_args.commit_id == NULL) {
5499 		err = got_error_from_errno("got_object_id_dup");
5500 		goto done;
5501 	}
5502 	blame->cb_args.quit = &s->done;
5503 
5504 	blame->thread_args.path = s->path;
5505 	blame->thread_args.repo = thread_repo;
5506 	blame->thread_args.cb_args = &blame->cb_args;
5507 	blame->thread_args.complete = &s->blame_complete;
5508 	blame->thread_args.cancel_cb = cancel_blame_view;
5509 	blame->thread_args.cancel_arg = &s->done;
5510 	s->blame_complete = 0;
5511 
5512 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5513 		s->first_displayed_line = 1;
5514 		s->last_displayed_line = view->nlines;
5515 		s->selected_line = 1;
5516 	}
5517 	s->matched_line = 0;
5518 
5519 done:
5520 	if (commit)
5521 		got_object_commit_close(commit);
5522 	if (fd != -1 && close(fd) == -1 && err == NULL)
5523 		err = got_error_from_errno("close");
5524 	if (blob)
5525 		got_object_blob_close(blob);
5526 	free(obj_id);
5527 	if (err)
5528 		stop_blame(blame);
5529 	return err;
5530 }
5531 
5532 static const struct got_error *
5533 open_blame_view(struct tog_view *view, char *path,
5534     struct got_object_id *commit_id, struct got_repository *repo)
5535 {
5536 	const struct got_error *err = NULL;
5537 	struct tog_blame_view_state *s = &view->state.blame;
5538 
5539 	STAILQ_INIT(&s->blamed_commits);
5540 
5541 	s->path = strdup(path);
5542 	if (s->path == NULL)
5543 		return got_error_from_errno("strdup");
5544 
5545 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5546 	if (err) {
5547 		free(s->path);
5548 		return err;
5549 	}
5550 
5551 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5552 	s->first_displayed_line = 1;
5553 	s->last_displayed_line = view->nlines;
5554 	s->selected_line = 1;
5555 	s->blame_complete = 0;
5556 	s->repo = repo;
5557 	s->commit_id = commit_id;
5558 	memset(&s->blame, 0, sizeof(s->blame));
5559 
5560 	STAILQ_INIT(&s->colors);
5561 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5562 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5563 		    get_color_value("TOG_COLOR_COMMIT"));
5564 		if (err)
5565 			return err;
5566 	}
5567 
5568 	view->show = show_blame_view;
5569 	view->input = input_blame_view;
5570 	view->reset = reset_blame_view;
5571 	view->close = close_blame_view;
5572 	view->search_start = search_start_blame_view;
5573 	view->search_next = search_next_blame_view;
5574 
5575 	return run_blame(view);
5576 }
5577 
5578 static const struct got_error *
5579 close_blame_view(struct tog_view *view)
5580 {
5581 	const struct got_error *err = NULL;
5582 	struct tog_blame_view_state *s = &view->state.blame;
5583 
5584 	if (s->blame.thread)
5585 		err = stop_blame(&s->blame);
5586 
5587 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5588 		struct got_object_qid *blamed_commit;
5589 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5590 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5591 		got_object_qid_free(blamed_commit);
5592 	}
5593 
5594 	free(s->path);
5595 	free_colors(&s->colors);
5596 	return err;
5597 }
5598 
5599 static const struct got_error *
5600 search_start_blame_view(struct tog_view *view)
5601 {
5602 	struct tog_blame_view_state *s = &view->state.blame;
5603 
5604 	s->matched_line = 0;
5605 	return NULL;
5606 }
5607 
5608 static const struct got_error *
5609 search_next_blame_view(struct tog_view *view)
5610 {
5611 	struct tog_blame_view_state *s = &view->state.blame;
5612 	const struct got_error *err = NULL;
5613 	int lineno;
5614 	char *line = NULL;
5615 	size_t linesize = 0;
5616 	ssize_t linelen;
5617 
5618 	if (!view->searching) {
5619 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5620 		return NULL;
5621 	}
5622 
5623 	if (s->matched_line) {
5624 		if (view->searching == TOG_SEARCH_FORWARD)
5625 			lineno = s->matched_line + 1;
5626 		else
5627 			lineno = s->matched_line - 1;
5628 	} else
5629 		lineno = s->first_displayed_line - 1 + s->selected_line;
5630 
5631 	while (1) {
5632 		off_t offset;
5633 
5634 		if (lineno <= 0 || lineno > s->blame.nlines) {
5635 			if (s->matched_line == 0) {
5636 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5637 				break;
5638 			}
5639 
5640 			if (view->searching == TOG_SEARCH_FORWARD)
5641 				lineno = 1;
5642 			else
5643 				lineno = s->blame.nlines;
5644 		}
5645 
5646 		offset = s->blame.line_offsets[lineno - 1];
5647 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5648 			free(line);
5649 			return got_error_from_errno("fseeko");
5650 		}
5651 		linelen = getline(&line, &linesize, s->blame.f);
5652 		if (linelen != -1) {
5653 			char *exstr;
5654 			err = expand_tab(&exstr, line);
5655 			if (err)
5656 				break;
5657 			if (match_line(exstr, &view->regex, 1,
5658 			    &view->regmatch)) {
5659 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5660 				s->matched_line = lineno;
5661 				free(exstr);
5662 				break;
5663 			}
5664 			free(exstr);
5665 		}
5666 		if (view->searching == TOG_SEARCH_FORWARD)
5667 			lineno++;
5668 		else
5669 			lineno--;
5670 	}
5671 	free(line);
5672 
5673 	if (s->matched_line) {
5674 		s->first_displayed_line = s->matched_line;
5675 		s->selected_line = 1;
5676 	}
5677 
5678 	return err;
5679 }
5680 
5681 static const struct got_error *
5682 show_blame_view(struct tog_view *view)
5683 {
5684 	const struct got_error *err = NULL;
5685 	struct tog_blame_view_state *s = &view->state.blame;
5686 	int errcode;
5687 
5688 	if (s->blame.thread == NULL && !s->blame_complete) {
5689 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5690 		    &s->blame.thread_args);
5691 		if (errcode)
5692 			return got_error_set_errno(errcode, "pthread_create");
5693 
5694 		halfdelay(1); /* fast refresh while annotating  */
5695 	}
5696 
5697 	if (s->blame_complete)
5698 		halfdelay(10); /* disable fast refresh */
5699 
5700 	err = draw_blame(view);
5701 
5702 	view_border(view);
5703 	return err;
5704 }
5705 
5706 static const struct got_error *
5707 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5708 {
5709 	const struct got_error *err = NULL, *thread_err = NULL;
5710 	struct tog_view *diff_view;
5711 	struct tog_blame_view_state *s = &view->state.blame;
5712 	int eos, nscroll, begin_y = 0, begin_x = 0;
5713 
5714 	eos = nscroll = view->nlines - 2;
5715 	if (view_is_hsplit_top(view))
5716 		--eos;  /* border */
5717 
5718 	switch (ch) {
5719 	case '0':
5720 		view->x = 0;
5721 		break;
5722 	case '$':
5723 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5724 		view->count = 0;
5725 		break;
5726 	case KEY_RIGHT:
5727 	case 'l':
5728 		if (view->x + view->ncols / 3 < view->maxx)
5729 			view->x += 2;  /* move two columns right */
5730 		else
5731 			view->count = 0;
5732 		break;
5733 	case KEY_LEFT:
5734 	case 'h':
5735 		view->x -= MIN(view->x, 2);  /* move two columns back */
5736 		if (view->x <= 0)
5737 			view->count = 0;
5738 		break;
5739 	case 'q':
5740 		s->done = 1;
5741 		break;
5742 	case 'g':
5743 	case KEY_HOME:
5744 		s->selected_line = 1;
5745 		s->first_displayed_line = 1;
5746 		view->count = 0;
5747 		break;
5748 	case 'G':
5749 	case KEY_END:
5750 		if (s->blame.nlines < eos) {
5751 			s->selected_line = s->blame.nlines;
5752 			s->first_displayed_line = 1;
5753 		} else {
5754 			s->selected_line = eos;
5755 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5756 		}
5757 		view->count = 0;
5758 		break;
5759 	case 'k':
5760 	case KEY_UP:
5761 	case CTRL('p'):
5762 		if (s->selected_line > 1)
5763 			s->selected_line--;
5764 		else if (s->selected_line == 1 &&
5765 		    s->first_displayed_line > 1)
5766 			s->first_displayed_line--;
5767 		else
5768 			view->count = 0;
5769 		break;
5770 	case CTRL('u'):
5771 	case 'u':
5772 		nscroll /= 2;
5773 		/* FALL THROUGH */
5774 	case KEY_PPAGE:
5775 	case CTRL('b'):
5776 	case 'b':
5777 		if (s->first_displayed_line == 1) {
5778 			if (view->count > 1)
5779 				nscroll += nscroll;
5780 			s->selected_line = MAX(1, s->selected_line - nscroll);
5781 			view->count = 0;
5782 			break;
5783 		}
5784 		if (s->first_displayed_line > nscroll)
5785 			s->first_displayed_line -= nscroll;
5786 		else
5787 			s->first_displayed_line = 1;
5788 		break;
5789 	case 'j':
5790 	case KEY_DOWN:
5791 	case CTRL('n'):
5792 		if (s->selected_line < eos && s->first_displayed_line +
5793 		    s->selected_line <= s->blame.nlines)
5794 			s->selected_line++;
5795 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5796 			s->first_displayed_line++;
5797 		else
5798 			view->count = 0;
5799 		break;
5800 	case 'c':
5801 	case 'p': {
5802 		struct got_object_id *id = NULL;
5803 
5804 		view->count = 0;
5805 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5806 		    s->first_displayed_line, s->selected_line);
5807 		if (id == NULL)
5808 			break;
5809 		if (ch == 'p') {
5810 			struct got_commit_object *commit, *pcommit;
5811 			struct got_object_qid *pid;
5812 			struct got_object_id *blob_id = NULL;
5813 			int obj_type;
5814 			err = got_object_open_as_commit(&commit,
5815 			    s->repo, id);
5816 			if (err)
5817 				break;
5818 			pid = STAILQ_FIRST(
5819 			    got_object_commit_get_parent_ids(commit));
5820 			if (pid == NULL) {
5821 				got_object_commit_close(commit);
5822 				break;
5823 			}
5824 			/* Check if path history ends here. */
5825 			err = got_object_open_as_commit(&pcommit,
5826 			    s->repo, &pid->id);
5827 			if (err)
5828 				break;
5829 			err = got_object_id_by_path(&blob_id, s->repo,
5830 			    pcommit, s->path);
5831 			got_object_commit_close(pcommit);
5832 			if (err) {
5833 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5834 					err = NULL;
5835 				got_object_commit_close(commit);
5836 				break;
5837 			}
5838 			err = got_object_get_type(&obj_type, s->repo,
5839 			    blob_id);
5840 			free(blob_id);
5841 			/* Can't blame non-blob type objects. */
5842 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5843 				got_object_commit_close(commit);
5844 				break;
5845 			}
5846 			err = got_object_qid_alloc(&s->blamed_commit,
5847 			    &pid->id);
5848 			got_object_commit_close(commit);
5849 		} else {
5850 			if (got_object_id_cmp(id,
5851 			    &s->blamed_commit->id) == 0)
5852 				break;
5853 			err = got_object_qid_alloc(&s->blamed_commit,
5854 			    id);
5855 		}
5856 		if (err)
5857 			break;
5858 		s->done = 1;
5859 		thread_err = stop_blame(&s->blame);
5860 		s->done = 0;
5861 		if (thread_err)
5862 			break;
5863 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5864 		    s->blamed_commit, entry);
5865 		err = run_blame(view);
5866 		if (err)
5867 			break;
5868 		break;
5869 	}
5870 	case 'C': {
5871 		struct got_object_qid *first;
5872 
5873 		view->count = 0;
5874 		first = STAILQ_FIRST(&s->blamed_commits);
5875 		if (!got_object_id_cmp(&first->id, s->commit_id))
5876 			break;
5877 		s->done = 1;
5878 		thread_err = stop_blame(&s->blame);
5879 		s->done = 0;
5880 		if (thread_err)
5881 			break;
5882 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5883 		got_object_qid_free(s->blamed_commit);
5884 		s->blamed_commit =
5885 		    STAILQ_FIRST(&s->blamed_commits);
5886 		err = run_blame(view);
5887 		if (err)
5888 			break;
5889 		break;
5890 	}
5891 	case KEY_ENTER:
5892 	case '\r': {
5893 		struct got_object_id *id = NULL;
5894 		struct got_object_qid *pid;
5895 		struct got_commit_object *commit = NULL;
5896 
5897 		view->count = 0;
5898 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5899 		    s->first_displayed_line, s->selected_line);
5900 		if (id == NULL)
5901 			break;
5902 		err = got_object_open_as_commit(&commit, s->repo, id);
5903 		if (err)
5904 			break;
5905 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5906 		if (*new_view) {
5907 			/* traversed from diff view, release diff resources  */
5908 			err = close_diff_view(*new_view);
5909 			if (err)
5910 				break;
5911 			diff_view = *new_view;
5912 		} else {
5913 			if (view_is_parent_view(view))
5914 				view_get_split(view, &begin_y, &begin_x);
5915 
5916 			diff_view = view_open(0, 0, begin_y, begin_x,
5917 			    TOG_VIEW_DIFF);
5918 			if (diff_view == NULL) {
5919 				got_object_commit_close(commit);
5920 				err = got_error_from_errno("view_open");
5921 				break;
5922 			}
5923 		}
5924 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5925 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
5926 		got_object_commit_close(commit);
5927 		if (err) {
5928 			view_close(diff_view);
5929 			break;
5930 		}
5931 		s->last_diffed_line = s->first_displayed_line - 1 +
5932 		    s->selected_line;
5933 		if (*new_view)
5934 			break;	/* still open from active diff view */
5935 		if (view_is_parent_view(view) &&
5936 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5937 			err = view_init_hsplit(view, begin_y);
5938 			if (err)
5939 				break;
5940 		}
5941 
5942 		view->focussed = 0;
5943 		diff_view->focussed = 1;
5944 		diff_view->mode = view->mode;
5945 		diff_view->nlines = view->lines - begin_y;
5946 		if (view_is_parent_view(view)) {
5947 			view_transfer_size(diff_view, view);
5948 			err = view_close_child(view);
5949 			if (err)
5950 				break;
5951 			err = view_set_child(view, diff_view);
5952 			if (err)
5953 				break;
5954 			view->focus_child = 1;
5955 		} else
5956 			*new_view = diff_view;
5957 		if (err)
5958 			break;
5959 		break;
5960 	}
5961 	case CTRL('d'):
5962 	case 'd':
5963 		nscroll /= 2;
5964 		/* FALL THROUGH */
5965 	case KEY_NPAGE:
5966 	case CTRL('f'):
5967 	case 'f':
5968 	case ' ':
5969 		if (s->last_displayed_line >= s->blame.nlines &&
5970 		    s->selected_line >= MIN(s->blame.nlines,
5971 		    view->nlines - 2)) {
5972 			view->count = 0;
5973 			break;
5974 		}
5975 		if (s->last_displayed_line >= s->blame.nlines &&
5976 		    s->selected_line < view->nlines - 2) {
5977 			s->selected_line +=
5978 			    MIN(nscroll, s->last_displayed_line -
5979 			    s->first_displayed_line - s->selected_line + 1);
5980 		}
5981 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5982 			s->first_displayed_line += nscroll;
5983 		else
5984 			s->first_displayed_line =
5985 			    s->blame.nlines - (view->nlines - 3);
5986 		break;
5987 	case KEY_RESIZE:
5988 		if (s->selected_line > view->nlines - 2) {
5989 			s->selected_line = MIN(s->blame.nlines,
5990 			    view->nlines - 2);
5991 		}
5992 		break;
5993 	default:
5994 		view->count = 0;
5995 		break;
5996 	}
5997 	return thread_err ? thread_err : err;
5998 }
5999 
6000 static const struct got_error *
6001 reset_blame_view(struct tog_view *view)
6002 {
6003 	const struct got_error *err;
6004 	struct tog_blame_view_state *s = &view->state.blame;
6005 
6006 	view->count = 0;
6007 	s->done = 1;
6008 	err = stop_blame(&s->blame);
6009 	s->done = 0;
6010 	if (err)
6011 		return err;
6012 	return run_blame(view);
6013 }
6014 
6015 static const struct got_error *
6016 cmd_blame(int argc, char *argv[])
6017 {
6018 	const struct got_error *error;
6019 	struct got_repository *repo = NULL;
6020 	struct got_worktree *worktree = NULL;
6021 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6022 	char *link_target = NULL;
6023 	struct got_object_id *commit_id = NULL;
6024 	struct got_commit_object *commit = NULL;
6025 	char *commit_id_str = NULL;
6026 	int ch;
6027 	struct tog_view *view;
6028 	int *pack_fds = NULL;
6029 
6030 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6031 		switch (ch) {
6032 		case 'c':
6033 			commit_id_str = optarg;
6034 			break;
6035 		case 'r':
6036 			repo_path = realpath(optarg, NULL);
6037 			if (repo_path == NULL)
6038 				return got_error_from_errno2("realpath",
6039 				    optarg);
6040 			break;
6041 		default:
6042 			usage_blame();
6043 			/* NOTREACHED */
6044 		}
6045 	}
6046 
6047 	argc -= optind;
6048 	argv += optind;
6049 
6050 	if (argc != 1)
6051 		usage_blame();
6052 
6053 	error = got_repo_pack_fds_open(&pack_fds);
6054 	if (error != NULL)
6055 		goto done;
6056 
6057 	if (repo_path == NULL) {
6058 		cwd = getcwd(NULL, 0);
6059 		if (cwd == NULL)
6060 			return got_error_from_errno("getcwd");
6061 		error = got_worktree_open(&worktree, cwd);
6062 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6063 			goto done;
6064 		if (worktree)
6065 			repo_path =
6066 			    strdup(got_worktree_get_repo_path(worktree));
6067 		else
6068 			repo_path = strdup(cwd);
6069 		if (repo_path == NULL) {
6070 			error = got_error_from_errno("strdup");
6071 			goto done;
6072 		}
6073 	}
6074 
6075 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6076 	if (error != NULL)
6077 		goto done;
6078 
6079 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6080 	    worktree);
6081 	if (error)
6082 		goto done;
6083 
6084 	init_curses();
6085 
6086 	error = apply_unveil(got_repo_get_path(repo), NULL);
6087 	if (error)
6088 		goto done;
6089 
6090 	error = tog_load_refs(repo, 0);
6091 	if (error)
6092 		goto done;
6093 
6094 	if (commit_id_str == NULL) {
6095 		struct got_reference *head_ref;
6096 		error = got_ref_open(&head_ref, repo, worktree ?
6097 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6098 		if (error != NULL)
6099 			goto done;
6100 		error = got_ref_resolve(&commit_id, repo, head_ref);
6101 		got_ref_close(head_ref);
6102 	} else {
6103 		error = got_repo_match_object_id(&commit_id, NULL,
6104 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6105 	}
6106 	if (error != NULL)
6107 		goto done;
6108 
6109 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6110 	if (view == NULL) {
6111 		error = got_error_from_errno("view_open");
6112 		goto done;
6113 	}
6114 
6115 	error = got_object_open_as_commit(&commit, repo, commit_id);
6116 	if (error)
6117 		goto done;
6118 
6119 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6120 	    commit, repo);
6121 	if (error)
6122 		goto done;
6123 
6124 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6125 	    commit_id, repo);
6126 	if (error)
6127 		goto done;
6128 	if (worktree) {
6129 		/* Release work tree lock. */
6130 		got_worktree_close(worktree);
6131 		worktree = NULL;
6132 	}
6133 	error = view_loop(view);
6134 done:
6135 	free(repo_path);
6136 	free(in_repo_path);
6137 	free(link_target);
6138 	free(cwd);
6139 	free(commit_id);
6140 	if (commit)
6141 		got_object_commit_close(commit);
6142 	if (worktree)
6143 		got_worktree_close(worktree);
6144 	if (repo) {
6145 		const struct got_error *close_err = got_repo_close(repo);
6146 		if (error == NULL)
6147 			error = close_err;
6148 	}
6149 	if (pack_fds) {
6150 		const struct got_error *pack_err =
6151 		    got_repo_pack_fds_close(pack_fds);
6152 		if (error == NULL)
6153 			error = pack_err;
6154 	}
6155 	tog_free_refs();
6156 	return error;
6157 }
6158 
6159 static const struct got_error *
6160 draw_tree_entries(struct tog_view *view, const char *parent_path)
6161 {
6162 	struct tog_tree_view_state *s = &view->state.tree;
6163 	const struct got_error *err = NULL;
6164 	struct got_tree_entry *te;
6165 	wchar_t *wline;
6166 	struct tog_color *tc;
6167 	int width, n, i, nentries;
6168 	int limit = view->nlines;
6169 
6170 	s->ndisplayed = 0;
6171 	if (view_is_hsplit_top(view))
6172 		--limit;  /* border */
6173 
6174 	werase(view->window);
6175 
6176 	if (limit == 0)
6177 		return NULL;
6178 
6179 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6180 	    0, 0);
6181 	if (err)
6182 		return err;
6183 	if (view_needs_focus_indication(view))
6184 		wstandout(view->window);
6185 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6186 	if (tc)
6187 		wattr_on(view->window,
6188 		    COLOR_PAIR(tc->colorpair), NULL);
6189 	waddwstr(view->window, wline);
6190 	if (tc)
6191 		wattr_off(view->window,
6192 		    COLOR_PAIR(tc->colorpair), NULL);
6193 	if (view_needs_focus_indication(view))
6194 		wstandend(view->window);
6195 	free(wline);
6196 	wline = NULL;
6197 	if (width < view->ncols - 1)
6198 		waddch(view->window, '\n');
6199 	if (--limit <= 0)
6200 		return NULL;
6201 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6202 	    0, 0);
6203 	if (err)
6204 		return err;
6205 	waddwstr(view->window, wline);
6206 	free(wline);
6207 	wline = NULL;
6208 	if (width < view->ncols - 1)
6209 		waddch(view->window, '\n');
6210 	if (--limit <= 0)
6211 		return NULL;
6212 	waddch(view->window, '\n');
6213 	if (--limit <= 0)
6214 		return NULL;
6215 
6216 	if (s->first_displayed_entry == NULL) {
6217 		te = got_object_tree_get_first_entry(s->tree);
6218 		if (s->selected == 0) {
6219 			if (view->focussed)
6220 				wstandout(view->window);
6221 			s->selected_entry = NULL;
6222 		}
6223 		waddstr(view->window, "  ..\n");	/* parent directory */
6224 		if (s->selected == 0 && view->focussed)
6225 			wstandend(view->window);
6226 		s->ndisplayed++;
6227 		if (--limit <= 0)
6228 			return NULL;
6229 		n = 1;
6230 	} else {
6231 		n = 0;
6232 		te = s->first_displayed_entry;
6233 	}
6234 
6235 	nentries = got_object_tree_get_nentries(s->tree);
6236 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6237 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6238 		const char *modestr = "";
6239 		mode_t mode;
6240 
6241 		te = got_object_tree_get_entry(s->tree, i);
6242 		mode = got_tree_entry_get_mode(te);
6243 
6244 		if (s->show_ids) {
6245 			err = got_object_id_str(&id_str,
6246 			    got_tree_entry_get_id(te));
6247 			if (err)
6248 				return got_error_from_errno(
6249 				    "got_object_id_str");
6250 		}
6251 		if (got_object_tree_entry_is_submodule(te))
6252 			modestr = "$";
6253 		else if (S_ISLNK(mode)) {
6254 			int i;
6255 
6256 			err = got_tree_entry_get_symlink_target(&link_target,
6257 			    te, s->repo);
6258 			if (err) {
6259 				free(id_str);
6260 				return err;
6261 			}
6262 			for (i = 0; i < strlen(link_target); i++) {
6263 				if (!isprint((unsigned char)link_target[i]))
6264 					link_target[i] = '?';
6265 			}
6266 			modestr = "@";
6267 		}
6268 		else if (S_ISDIR(mode))
6269 			modestr = "/";
6270 		else if (mode & S_IXUSR)
6271 			modestr = "*";
6272 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6273 		    got_tree_entry_get_name(te), modestr,
6274 		    link_target ? " -> ": "",
6275 		    link_target ? link_target : "") == -1) {
6276 			free(id_str);
6277 			free(link_target);
6278 			return got_error_from_errno("asprintf");
6279 		}
6280 		free(id_str);
6281 		free(link_target);
6282 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6283 		    0, 0);
6284 		if (err) {
6285 			free(line);
6286 			break;
6287 		}
6288 		if (n == s->selected) {
6289 			if (view->focussed)
6290 				wstandout(view->window);
6291 			s->selected_entry = te;
6292 		}
6293 		tc = match_color(&s->colors, line);
6294 		if (tc)
6295 			wattr_on(view->window,
6296 			    COLOR_PAIR(tc->colorpair), NULL);
6297 		waddwstr(view->window, wline);
6298 		if (tc)
6299 			wattr_off(view->window,
6300 			    COLOR_PAIR(tc->colorpair), NULL);
6301 		if (width < view->ncols - 1)
6302 			waddch(view->window, '\n');
6303 		if (n == s->selected && view->focussed)
6304 			wstandend(view->window);
6305 		free(line);
6306 		free(wline);
6307 		wline = NULL;
6308 		n++;
6309 		s->ndisplayed++;
6310 		s->last_displayed_entry = te;
6311 		if (--limit <= 0)
6312 			break;
6313 	}
6314 
6315 	return err;
6316 }
6317 
6318 static void
6319 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6320 {
6321 	struct got_tree_entry *te;
6322 	int isroot = s->tree == s->root;
6323 	int i = 0;
6324 
6325 	if (s->first_displayed_entry == NULL)
6326 		return;
6327 
6328 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6329 	while (i++ < maxscroll) {
6330 		if (te == NULL) {
6331 			if (!isroot)
6332 				s->first_displayed_entry = NULL;
6333 			break;
6334 		}
6335 		s->first_displayed_entry = te;
6336 		te = got_tree_entry_get_prev(s->tree, te);
6337 	}
6338 }
6339 
6340 static const struct got_error *
6341 tree_scroll_down(struct tog_view *view, int maxscroll)
6342 {
6343 	struct tog_tree_view_state *s = &view->state.tree;
6344 	struct got_tree_entry *next, *last;
6345 	int n = 0;
6346 
6347 	if (s->first_displayed_entry)
6348 		next = got_tree_entry_get_next(s->tree,
6349 		    s->first_displayed_entry);
6350 	else
6351 		next = got_object_tree_get_first_entry(s->tree);
6352 
6353 	last = s->last_displayed_entry;
6354 	while (next && n++ < maxscroll) {
6355 		if (last)
6356 			last = got_tree_entry_get_next(s->tree, last);
6357 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6358 			s->first_displayed_entry = next;
6359 			next = got_tree_entry_get_next(s->tree, next);
6360 		}
6361 	}
6362 
6363 	return NULL;
6364 }
6365 
6366 static const struct got_error *
6367 tree_entry_path(char **path, struct tog_parent_trees *parents,
6368     struct got_tree_entry *te)
6369 {
6370 	const struct got_error *err = NULL;
6371 	struct tog_parent_tree *pt;
6372 	size_t len = 2; /* for leading slash and NUL */
6373 
6374 	TAILQ_FOREACH(pt, parents, entry)
6375 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6376 		    + 1 /* slash */;
6377 	if (te)
6378 		len += strlen(got_tree_entry_get_name(te));
6379 
6380 	*path = calloc(1, len);
6381 	if (path == NULL)
6382 		return got_error_from_errno("calloc");
6383 
6384 	(*path)[0] = '/';
6385 	pt = TAILQ_LAST(parents, tog_parent_trees);
6386 	while (pt) {
6387 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6388 		if (strlcat(*path, name, len) >= len) {
6389 			err = got_error(GOT_ERR_NO_SPACE);
6390 			goto done;
6391 		}
6392 		if (strlcat(*path, "/", len) >= len) {
6393 			err = got_error(GOT_ERR_NO_SPACE);
6394 			goto done;
6395 		}
6396 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6397 	}
6398 	if (te) {
6399 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6400 			err = got_error(GOT_ERR_NO_SPACE);
6401 			goto done;
6402 		}
6403 	}
6404 done:
6405 	if (err) {
6406 		free(*path);
6407 		*path = NULL;
6408 	}
6409 	return err;
6410 }
6411 
6412 static const struct got_error *
6413 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6414     struct got_tree_entry *te, struct tog_parent_trees *parents,
6415     struct got_object_id *commit_id, struct got_repository *repo)
6416 {
6417 	const struct got_error *err = NULL;
6418 	char *path;
6419 	struct tog_view *blame_view;
6420 
6421 	*new_view = NULL;
6422 
6423 	err = tree_entry_path(&path, parents, te);
6424 	if (err)
6425 		return err;
6426 
6427 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6428 	if (blame_view == NULL) {
6429 		err = got_error_from_errno("view_open");
6430 		goto done;
6431 	}
6432 
6433 	err = open_blame_view(blame_view, path, commit_id, repo);
6434 	if (err) {
6435 		if (err->code == GOT_ERR_CANCELLED)
6436 			err = NULL;
6437 		view_close(blame_view);
6438 	} else
6439 		*new_view = blame_view;
6440 done:
6441 	free(path);
6442 	return err;
6443 }
6444 
6445 static const struct got_error *
6446 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6447     struct tog_tree_view_state *s)
6448 {
6449 	struct tog_view *log_view;
6450 	const struct got_error *err = NULL;
6451 	char *path;
6452 
6453 	*new_view = NULL;
6454 
6455 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6456 	if (log_view == NULL)
6457 		return got_error_from_errno("view_open");
6458 
6459 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6460 	if (err)
6461 		return err;
6462 
6463 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6464 	    path, 0);
6465 	if (err)
6466 		view_close(log_view);
6467 	else
6468 		*new_view = log_view;
6469 	free(path);
6470 	return err;
6471 }
6472 
6473 static const struct got_error *
6474 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6475     const char *head_ref_name, struct got_repository *repo)
6476 {
6477 	const struct got_error *err = NULL;
6478 	char *commit_id_str = NULL;
6479 	struct tog_tree_view_state *s = &view->state.tree;
6480 	struct got_commit_object *commit = NULL;
6481 
6482 	TAILQ_INIT(&s->parents);
6483 	STAILQ_INIT(&s->colors);
6484 
6485 	s->commit_id = got_object_id_dup(commit_id);
6486 	if (s->commit_id == NULL)
6487 		return got_error_from_errno("got_object_id_dup");
6488 
6489 	err = got_object_open_as_commit(&commit, repo, commit_id);
6490 	if (err)
6491 		goto done;
6492 
6493 	/*
6494 	 * The root is opened here and will be closed when the view is closed.
6495 	 * Any visited subtrees and their path-wise parents are opened and
6496 	 * closed on demand.
6497 	 */
6498 	err = got_object_open_as_tree(&s->root, repo,
6499 	    got_object_commit_get_tree_id(commit));
6500 	if (err)
6501 		goto done;
6502 	s->tree = s->root;
6503 
6504 	err = got_object_id_str(&commit_id_str, commit_id);
6505 	if (err != NULL)
6506 		goto done;
6507 
6508 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6509 		err = got_error_from_errno("asprintf");
6510 		goto done;
6511 	}
6512 
6513 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6514 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6515 	if (head_ref_name) {
6516 		s->head_ref_name = strdup(head_ref_name);
6517 		if (s->head_ref_name == NULL) {
6518 			err = got_error_from_errno("strdup");
6519 			goto done;
6520 		}
6521 	}
6522 	s->repo = repo;
6523 
6524 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6525 		err = add_color(&s->colors, "\\$$",
6526 		    TOG_COLOR_TREE_SUBMODULE,
6527 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6528 		if (err)
6529 			goto done;
6530 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6531 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6532 		if (err)
6533 			goto done;
6534 		err = add_color(&s->colors, "/$",
6535 		    TOG_COLOR_TREE_DIRECTORY,
6536 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6537 		if (err)
6538 			goto done;
6539 
6540 		err = add_color(&s->colors, "\\*$",
6541 		    TOG_COLOR_TREE_EXECUTABLE,
6542 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6543 		if (err)
6544 			goto done;
6545 
6546 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6547 		    get_color_value("TOG_COLOR_COMMIT"));
6548 		if (err)
6549 			goto done;
6550 	}
6551 
6552 	view->show = show_tree_view;
6553 	view->input = input_tree_view;
6554 	view->close = close_tree_view;
6555 	view->search_start = search_start_tree_view;
6556 	view->search_next = search_next_tree_view;
6557 done:
6558 	free(commit_id_str);
6559 	if (commit)
6560 		got_object_commit_close(commit);
6561 	if (err)
6562 		close_tree_view(view);
6563 	return err;
6564 }
6565 
6566 static const struct got_error *
6567 close_tree_view(struct tog_view *view)
6568 {
6569 	struct tog_tree_view_state *s = &view->state.tree;
6570 
6571 	free_colors(&s->colors);
6572 	free(s->tree_label);
6573 	s->tree_label = NULL;
6574 	free(s->commit_id);
6575 	s->commit_id = NULL;
6576 	free(s->head_ref_name);
6577 	s->head_ref_name = NULL;
6578 	while (!TAILQ_EMPTY(&s->parents)) {
6579 		struct tog_parent_tree *parent;
6580 		parent = TAILQ_FIRST(&s->parents);
6581 		TAILQ_REMOVE(&s->parents, parent, entry);
6582 		if (parent->tree != s->root)
6583 			got_object_tree_close(parent->tree);
6584 		free(parent);
6585 
6586 	}
6587 	if (s->tree != NULL && s->tree != s->root)
6588 		got_object_tree_close(s->tree);
6589 	if (s->root)
6590 		got_object_tree_close(s->root);
6591 	return NULL;
6592 }
6593 
6594 static const struct got_error *
6595 search_start_tree_view(struct tog_view *view)
6596 {
6597 	struct tog_tree_view_state *s = &view->state.tree;
6598 
6599 	s->matched_entry = NULL;
6600 	return NULL;
6601 }
6602 
6603 static int
6604 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6605 {
6606 	regmatch_t regmatch;
6607 
6608 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6609 	    0) == 0;
6610 }
6611 
6612 static const struct got_error *
6613 search_next_tree_view(struct tog_view *view)
6614 {
6615 	struct tog_tree_view_state *s = &view->state.tree;
6616 	struct got_tree_entry *te = NULL;
6617 
6618 	if (!view->searching) {
6619 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6620 		return NULL;
6621 	}
6622 
6623 	if (s->matched_entry) {
6624 		if (view->searching == TOG_SEARCH_FORWARD) {
6625 			if (s->selected_entry)
6626 				te = got_tree_entry_get_next(s->tree,
6627 				    s->selected_entry);
6628 			else
6629 				te = got_object_tree_get_first_entry(s->tree);
6630 		} else {
6631 			if (s->selected_entry == NULL)
6632 				te = got_object_tree_get_last_entry(s->tree);
6633 			else
6634 				te = got_tree_entry_get_prev(s->tree,
6635 				    s->selected_entry);
6636 		}
6637 	} else {
6638 		if (s->selected_entry)
6639 			te = s->selected_entry;
6640 		else if (view->searching == TOG_SEARCH_FORWARD)
6641 			te = got_object_tree_get_first_entry(s->tree);
6642 		else
6643 			te = got_object_tree_get_last_entry(s->tree);
6644 	}
6645 
6646 	while (1) {
6647 		if (te == NULL) {
6648 			if (s->matched_entry == NULL) {
6649 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6650 				return NULL;
6651 			}
6652 			if (view->searching == TOG_SEARCH_FORWARD)
6653 				te = got_object_tree_get_first_entry(s->tree);
6654 			else
6655 				te = got_object_tree_get_last_entry(s->tree);
6656 		}
6657 
6658 		if (match_tree_entry(te, &view->regex)) {
6659 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6660 			s->matched_entry = te;
6661 			break;
6662 		}
6663 
6664 		if (view->searching == TOG_SEARCH_FORWARD)
6665 			te = got_tree_entry_get_next(s->tree, te);
6666 		else
6667 			te = got_tree_entry_get_prev(s->tree, te);
6668 	}
6669 
6670 	if (s->matched_entry) {
6671 		s->first_displayed_entry = s->matched_entry;
6672 		s->selected = 0;
6673 	}
6674 
6675 	return NULL;
6676 }
6677 
6678 static const struct got_error *
6679 show_tree_view(struct tog_view *view)
6680 {
6681 	const struct got_error *err = NULL;
6682 	struct tog_tree_view_state *s = &view->state.tree;
6683 	char *parent_path;
6684 
6685 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6686 	if (err)
6687 		return err;
6688 
6689 	err = draw_tree_entries(view, parent_path);
6690 	free(parent_path);
6691 
6692 	view_border(view);
6693 	return err;
6694 }
6695 
6696 static const struct got_error *
6697 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6698 {
6699 	const struct got_error *err = NULL;
6700 	struct tog_tree_view_state *s = &view->state.tree;
6701 	struct tog_view *log_view, *ref_view;
6702 	struct got_tree_entry *te;
6703 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6704 
6705 	switch (ch) {
6706 	case 'i':
6707 		s->show_ids = !s->show_ids;
6708 		view->count = 0;
6709 		break;
6710 	case 'l':
6711 		view->count = 0;
6712 		if (!s->selected_entry)
6713 			break;
6714 		if (view_is_parent_view(view))
6715 			view_get_split(view, &begin_y, &begin_x);
6716 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6717 		if (view_is_parent_view(view) &&
6718 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6719 			err = view_init_hsplit(view, begin_y);
6720 			if (err)
6721 				break;
6722 		}
6723 		view->focussed = 0;
6724 		log_view->focussed = 1;
6725 		log_view->mode = view->mode;
6726 		log_view->nlines = view->lines - begin_y;
6727 		if (view_is_parent_view(view)) {
6728 			view_transfer_size(log_view, view);
6729 			err = view_close_child(view);
6730 			if (err)
6731 				return err;
6732 			err = view_set_child(view, log_view);
6733 			if (err)
6734 				return err;
6735 			view->focus_child = 1;
6736 		} else
6737 			*new_view = log_view;
6738 		break;
6739 	case 'r':
6740 		view->count = 0;
6741 		if (view_is_parent_view(view))
6742 			view_get_split(view, &begin_y, &begin_x);
6743 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6744 		if (ref_view == NULL)
6745 			return got_error_from_errno("view_open");
6746 		err = open_ref_view(ref_view, s->repo);
6747 		if (err) {
6748 			view_close(ref_view);
6749 			return err;
6750 		}
6751 		if (view_is_parent_view(view) &&
6752 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6753 			err = view_init_hsplit(view, begin_y);
6754 			if (err)
6755 				break;
6756 		}
6757 		view->focussed = 0;
6758 		ref_view->focussed = 1;
6759 		ref_view->mode = view->mode;
6760 		ref_view->nlines = view->lines - begin_y;
6761 		if (view_is_parent_view(view)) {
6762 			view_transfer_size(ref_view, view);
6763 			err = view_close_child(view);
6764 			if (err)
6765 				return err;
6766 			err = view_set_child(view, ref_view);
6767 			if (err)
6768 				return err;
6769 			view->focus_child = 1;
6770 		} else
6771 			*new_view = ref_view;
6772 		break;
6773 	case 'g':
6774 	case KEY_HOME:
6775 		s->selected = 0;
6776 		view->count = 0;
6777 		if (s->tree == s->root)
6778 			s->first_displayed_entry =
6779 			    got_object_tree_get_first_entry(s->tree);
6780 		else
6781 			s->first_displayed_entry = NULL;
6782 		break;
6783 	case 'G':
6784 	case KEY_END: {
6785 		int eos = view->nlines - 3;
6786 
6787 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6788 			--eos;  /* border */
6789 		s->selected = 0;
6790 		view->count = 0;
6791 		te = got_object_tree_get_last_entry(s->tree);
6792 		for (n = 0; n < eos; n++) {
6793 			if (te == NULL) {
6794 				if(s->tree != s->root) {
6795 					s->first_displayed_entry = NULL;
6796 					n++;
6797 				}
6798 				break;
6799 			}
6800 			s->first_displayed_entry = te;
6801 			te = got_tree_entry_get_prev(s->tree, te);
6802 		}
6803 		if (n > 0)
6804 			s->selected = n - 1;
6805 		break;
6806 	}
6807 	case 'k':
6808 	case KEY_UP:
6809 	case CTRL('p'):
6810 		if (s->selected > 0) {
6811 			s->selected--;
6812 			break;
6813 		}
6814 		tree_scroll_up(s, 1);
6815 		if (s->selected_entry == NULL ||
6816 		    (s->tree == s->root && s->selected_entry ==
6817 		     got_object_tree_get_first_entry(s->tree)))
6818 			view->count = 0;
6819 		break;
6820 	case CTRL('u'):
6821 	case 'u':
6822 		nscroll /= 2;
6823 		/* FALL THROUGH */
6824 	case KEY_PPAGE:
6825 	case CTRL('b'):
6826 	case 'b':
6827 		if (s->tree == s->root) {
6828 			if (got_object_tree_get_first_entry(s->tree) ==
6829 			    s->first_displayed_entry)
6830 				s->selected -= MIN(s->selected, nscroll);
6831 		} else {
6832 			if (s->first_displayed_entry == NULL)
6833 				s->selected -= MIN(s->selected, nscroll);
6834 		}
6835 		tree_scroll_up(s, MAX(0, nscroll));
6836 		if (s->selected_entry == NULL ||
6837 		    (s->tree == s->root && s->selected_entry ==
6838 		     got_object_tree_get_first_entry(s->tree)))
6839 			view->count = 0;
6840 		break;
6841 	case 'j':
6842 	case KEY_DOWN:
6843 	case CTRL('n'):
6844 		if (s->selected < s->ndisplayed - 1) {
6845 			s->selected++;
6846 			break;
6847 		}
6848 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6849 		    == NULL) {
6850 			/* can't scroll any further */
6851 			view->count = 0;
6852 			break;
6853 		}
6854 		tree_scroll_down(view, 1);
6855 		break;
6856 	case CTRL('d'):
6857 	case 'd':
6858 		nscroll /= 2;
6859 		/* FALL THROUGH */
6860 	case KEY_NPAGE:
6861 	case CTRL('f'):
6862 	case 'f':
6863 	case ' ':
6864 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6865 		    == NULL) {
6866 			/* can't scroll any further; move cursor down */
6867 			if (s->selected < s->ndisplayed - 1)
6868 				s->selected += MIN(nscroll,
6869 				    s->ndisplayed - s->selected - 1);
6870 			else
6871 				view->count = 0;
6872 			break;
6873 		}
6874 		tree_scroll_down(view, nscroll);
6875 		break;
6876 	case KEY_ENTER:
6877 	case '\r':
6878 	case KEY_BACKSPACE:
6879 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6880 			struct tog_parent_tree *parent;
6881 			/* user selected '..' */
6882 			if (s->tree == s->root) {
6883 				view->count = 0;
6884 				break;
6885 			}
6886 			parent = TAILQ_FIRST(&s->parents);
6887 			TAILQ_REMOVE(&s->parents, parent,
6888 			    entry);
6889 			got_object_tree_close(s->tree);
6890 			s->tree = parent->tree;
6891 			s->first_displayed_entry =
6892 			    parent->first_displayed_entry;
6893 			s->selected_entry =
6894 			    parent->selected_entry;
6895 			s->selected = parent->selected;
6896 			if (s->selected > view->nlines - 3) {
6897 				err = offset_selection_down(view);
6898 				if (err)
6899 					break;
6900 			}
6901 			free(parent);
6902 		} else if (S_ISDIR(got_tree_entry_get_mode(
6903 		    s->selected_entry))) {
6904 			struct got_tree_object *subtree;
6905 			view->count = 0;
6906 			err = got_object_open_as_tree(&subtree, s->repo,
6907 			    got_tree_entry_get_id(s->selected_entry));
6908 			if (err)
6909 				break;
6910 			err = tree_view_visit_subtree(s, subtree);
6911 			if (err) {
6912 				got_object_tree_close(subtree);
6913 				break;
6914 			}
6915 		} else if (S_ISREG(got_tree_entry_get_mode(
6916 		    s->selected_entry))) {
6917 			struct tog_view *blame_view;
6918 			int begin_x = 0, begin_y = 0;
6919 
6920 			if (view_is_parent_view(view))
6921 				view_get_split(view, &begin_y, &begin_x);
6922 
6923 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6924 			    s->selected_entry, &s->parents,
6925 			    s->commit_id, s->repo);
6926 			if (err)
6927 				break;
6928 
6929 			if (view_is_parent_view(view) &&
6930 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
6931 				err = view_init_hsplit(view, begin_y);
6932 				if (err)
6933 					break;
6934 			}
6935 
6936 			view->count = 0;
6937 			view->focussed = 0;
6938 			blame_view->focussed = 1;
6939 			blame_view->mode = view->mode;
6940 			blame_view->nlines = view->lines - begin_y;
6941 			if (view_is_parent_view(view)) {
6942 				view_transfer_size(blame_view, view);
6943 				err = view_close_child(view);
6944 				if (err)
6945 					return err;
6946 				err = view_set_child(view, blame_view);
6947 				if (err)
6948 					return err;
6949 				view->focus_child = 1;
6950 			} else
6951 				*new_view = blame_view;
6952 		}
6953 		break;
6954 	case KEY_RESIZE:
6955 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6956 			s->selected = view->nlines - 4;
6957 		view->count = 0;
6958 		break;
6959 	default:
6960 		view->count = 0;
6961 		break;
6962 	}
6963 
6964 	return err;
6965 }
6966 
6967 __dead static void
6968 usage_tree(void)
6969 {
6970 	endwin();
6971 	fprintf(stderr,
6972 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6973 	    getprogname());
6974 	exit(1);
6975 }
6976 
6977 static const struct got_error *
6978 cmd_tree(int argc, char *argv[])
6979 {
6980 	const struct got_error *error;
6981 	struct got_repository *repo = NULL;
6982 	struct got_worktree *worktree = NULL;
6983 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6984 	struct got_object_id *commit_id = NULL;
6985 	struct got_commit_object *commit = NULL;
6986 	const char *commit_id_arg = NULL;
6987 	char *label = NULL;
6988 	struct got_reference *ref = NULL;
6989 	const char *head_ref_name = NULL;
6990 	int ch;
6991 	struct tog_view *view;
6992 	int *pack_fds = NULL;
6993 
6994 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6995 		switch (ch) {
6996 		case 'c':
6997 			commit_id_arg = optarg;
6998 			break;
6999 		case 'r':
7000 			repo_path = realpath(optarg, NULL);
7001 			if (repo_path == NULL)
7002 				return got_error_from_errno2("realpath",
7003 				    optarg);
7004 			break;
7005 		default:
7006 			usage_tree();
7007 			/* NOTREACHED */
7008 		}
7009 	}
7010 
7011 	argc -= optind;
7012 	argv += optind;
7013 
7014 	if (argc > 1)
7015 		usage_tree();
7016 
7017 	error = got_repo_pack_fds_open(&pack_fds);
7018 	if (error != NULL)
7019 		goto done;
7020 
7021 	if (repo_path == NULL) {
7022 		cwd = getcwd(NULL, 0);
7023 		if (cwd == NULL)
7024 			return got_error_from_errno("getcwd");
7025 		error = got_worktree_open(&worktree, cwd);
7026 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7027 			goto done;
7028 		if (worktree)
7029 			repo_path =
7030 			    strdup(got_worktree_get_repo_path(worktree));
7031 		else
7032 			repo_path = strdup(cwd);
7033 		if (repo_path == NULL) {
7034 			error = got_error_from_errno("strdup");
7035 			goto done;
7036 		}
7037 	}
7038 
7039 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7040 	if (error != NULL)
7041 		goto done;
7042 
7043 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7044 	    repo, worktree);
7045 	if (error)
7046 		goto done;
7047 
7048 	init_curses();
7049 
7050 	error = apply_unveil(got_repo_get_path(repo), NULL);
7051 	if (error)
7052 		goto done;
7053 
7054 	error = tog_load_refs(repo, 0);
7055 	if (error)
7056 		goto done;
7057 
7058 	if (commit_id_arg == NULL) {
7059 		error = got_repo_match_object_id(&commit_id, &label,
7060 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7061 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7062 		if (error)
7063 			goto done;
7064 		head_ref_name = label;
7065 	} else {
7066 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7067 		if (error == NULL)
7068 			head_ref_name = got_ref_get_name(ref);
7069 		else if (error->code != GOT_ERR_NOT_REF)
7070 			goto done;
7071 		error = got_repo_match_object_id(&commit_id, NULL,
7072 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7073 		if (error)
7074 			goto done;
7075 	}
7076 
7077 	error = got_object_open_as_commit(&commit, repo, commit_id);
7078 	if (error)
7079 		goto done;
7080 
7081 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7082 	if (view == NULL) {
7083 		error = got_error_from_errno("view_open");
7084 		goto done;
7085 	}
7086 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7087 	if (error)
7088 		goto done;
7089 	if (!got_path_is_root_dir(in_repo_path)) {
7090 		error = tree_view_walk_path(&view->state.tree, commit,
7091 		    in_repo_path);
7092 		if (error)
7093 			goto done;
7094 	}
7095 
7096 	if (worktree) {
7097 		/* Release work tree lock. */
7098 		got_worktree_close(worktree);
7099 		worktree = NULL;
7100 	}
7101 	error = view_loop(view);
7102 done:
7103 	free(repo_path);
7104 	free(cwd);
7105 	free(commit_id);
7106 	free(label);
7107 	if (ref)
7108 		got_ref_close(ref);
7109 	if (repo) {
7110 		const struct got_error *close_err = got_repo_close(repo);
7111 		if (error == NULL)
7112 			error = close_err;
7113 	}
7114 	if (pack_fds) {
7115 		const struct got_error *pack_err =
7116 		    got_repo_pack_fds_close(pack_fds);
7117 		if (error == NULL)
7118 			error = pack_err;
7119 	}
7120 	tog_free_refs();
7121 	return error;
7122 }
7123 
7124 static const struct got_error *
7125 ref_view_load_refs(struct tog_ref_view_state *s)
7126 {
7127 	struct got_reflist_entry *sre;
7128 	struct tog_reflist_entry *re;
7129 
7130 	s->nrefs = 0;
7131 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7132 		if (strncmp(got_ref_get_name(sre->ref),
7133 		    "refs/got/", 9) == 0 &&
7134 		    strncmp(got_ref_get_name(sre->ref),
7135 		    "refs/got/backup/", 16) != 0)
7136 			continue;
7137 
7138 		re = malloc(sizeof(*re));
7139 		if (re == NULL)
7140 			return got_error_from_errno("malloc");
7141 
7142 		re->ref = got_ref_dup(sre->ref);
7143 		if (re->ref == NULL)
7144 			return got_error_from_errno("got_ref_dup");
7145 		re->idx = s->nrefs++;
7146 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7147 	}
7148 
7149 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7150 	return NULL;
7151 }
7152 
7153 static void
7154 ref_view_free_refs(struct tog_ref_view_state *s)
7155 {
7156 	struct tog_reflist_entry *re;
7157 
7158 	while (!TAILQ_EMPTY(&s->refs)) {
7159 		re = TAILQ_FIRST(&s->refs);
7160 		TAILQ_REMOVE(&s->refs, re, entry);
7161 		got_ref_close(re->ref);
7162 		free(re);
7163 	}
7164 }
7165 
7166 static const struct got_error *
7167 open_ref_view(struct tog_view *view, struct got_repository *repo)
7168 {
7169 	const struct got_error *err = NULL;
7170 	struct tog_ref_view_state *s = &view->state.ref;
7171 
7172 	s->selected_entry = 0;
7173 	s->repo = repo;
7174 
7175 	TAILQ_INIT(&s->refs);
7176 	STAILQ_INIT(&s->colors);
7177 
7178 	err = ref_view_load_refs(s);
7179 	if (err)
7180 		return err;
7181 
7182 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7183 		err = add_color(&s->colors, "^refs/heads/",
7184 		    TOG_COLOR_REFS_HEADS,
7185 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7186 		if (err)
7187 			goto done;
7188 
7189 		err = add_color(&s->colors, "^refs/tags/",
7190 		    TOG_COLOR_REFS_TAGS,
7191 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7192 		if (err)
7193 			goto done;
7194 
7195 		err = add_color(&s->colors, "^refs/remotes/",
7196 		    TOG_COLOR_REFS_REMOTES,
7197 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7198 		if (err)
7199 			goto done;
7200 
7201 		err = add_color(&s->colors, "^refs/got/backup/",
7202 		    TOG_COLOR_REFS_BACKUP,
7203 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7204 		if (err)
7205 			goto done;
7206 	}
7207 
7208 	view->show = show_ref_view;
7209 	view->input = input_ref_view;
7210 	view->close = close_ref_view;
7211 	view->search_start = search_start_ref_view;
7212 	view->search_next = search_next_ref_view;
7213 done:
7214 	if (err)
7215 		free_colors(&s->colors);
7216 	return err;
7217 }
7218 
7219 static const struct got_error *
7220 close_ref_view(struct tog_view *view)
7221 {
7222 	struct tog_ref_view_state *s = &view->state.ref;
7223 
7224 	ref_view_free_refs(s);
7225 	free_colors(&s->colors);
7226 
7227 	return NULL;
7228 }
7229 
7230 static const struct got_error *
7231 resolve_reflist_entry(struct got_object_id **commit_id,
7232     struct tog_reflist_entry *re, struct got_repository *repo)
7233 {
7234 	const struct got_error *err = NULL;
7235 	struct got_object_id *obj_id;
7236 	struct got_tag_object *tag = NULL;
7237 	int obj_type;
7238 
7239 	*commit_id = NULL;
7240 
7241 	err = got_ref_resolve(&obj_id, repo, re->ref);
7242 	if (err)
7243 		return err;
7244 
7245 	err = got_object_get_type(&obj_type, repo, obj_id);
7246 	if (err)
7247 		goto done;
7248 
7249 	switch (obj_type) {
7250 	case GOT_OBJ_TYPE_COMMIT:
7251 		*commit_id = obj_id;
7252 		break;
7253 	case GOT_OBJ_TYPE_TAG:
7254 		err = got_object_open_as_tag(&tag, repo, obj_id);
7255 		if (err)
7256 			goto done;
7257 		free(obj_id);
7258 		err = got_object_get_type(&obj_type, repo,
7259 		    got_object_tag_get_object_id(tag));
7260 		if (err)
7261 			goto done;
7262 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7263 			err = got_error(GOT_ERR_OBJ_TYPE);
7264 			goto done;
7265 		}
7266 		*commit_id = got_object_id_dup(
7267 		    got_object_tag_get_object_id(tag));
7268 		if (*commit_id == NULL) {
7269 			err = got_error_from_errno("got_object_id_dup");
7270 			goto done;
7271 		}
7272 		break;
7273 	default:
7274 		err = got_error(GOT_ERR_OBJ_TYPE);
7275 		break;
7276 	}
7277 
7278 done:
7279 	if (tag)
7280 		got_object_tag_close(tag);
7281 	if (err) {
7282 		free(*commit_id);
7283 		*commit_id = NULL;
7284 	}
7285 	return err;
7286 }
7287 
7288 static const struct got_error *
7289 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7290     struct tog_reflist_entry *re, struct got_repository *repo)
7291 {
7292 	struct tog_view *log_view;
7293 	const struct got_error *err = NULL;
7294 	struct got_object_id *commit_id = NULL;
7295 
7296 	*new_view = NULL;
7297 
7298 	err = resolve_reflist_entry(&commit_id, re, repo);
7299 	if (err) {
7300 		if (err->code != GOT_ERR_OBJ_TYPE)
7301 			return err;
7302 		else
7303 			return NULL;
7304 	}
7305 
7306 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7307 	if (log_view == NULL) {
7308 		err = got_error_from_errno("view_open");
7309 		goto done;
7310 	}
7311 
7312 	err = open_log_view(log_view, commit_id, repo,
7313 	    got_ref_get_name(re->ref), "", 0);
7314 done:
7315 	if (err)
7316 		view_close(log_view);
7317 	else
7318 		*new_view = log_view;
7319 	free(commit_id);
7320 	return err;
7321 }
7322 
7323 static void
7324 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7325 {
7326 	struct tog_reflist_entry *re;
7327 	int i = 0;
7328 
7329 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7330 		return;
7331 
7332 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7333 	while (i++ < maxscroll) {
7334 		if (re == NULL)
7335 			break;
7336 		s->first_displayed_entry = re;
7337 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7338 	}
7339 }
7340 
7341 static const struct got_error *
7342 ref_scroll_down(struct tog_view *view, int maxscroll)
7343 {
7344 	struct tog_ref_view_state *s = &view->state.ref;
7345 	struct tog_reflist_entry *next, *last;
7346 	int n = 0;
7347 
7348 	if (s->first_displayed_entry)
7349 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7350 	else
7351 		next = TAILQ_FIRST(&s->refs);
7352 
7353 	last = s->last_displayed_entry;
7354 	while (next && n++ < maxscroll) {
7355 		if (last)
7356 			last = TAILQ_NEXT(last, entry);
7357 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7358 			s->first_displayed_entry = next;
7359 			next = TAILQ_NEXT(next, entry);
7360 		}
7361 	}
7362 
7363 	return NULL;
7364 }
7365 
7366 static const struct got_error *
7367 search_start_ref_view(struct tog_view *view)
7368 {
7369 	struct tog_ref_view_state *s = &view->state.ref;
7370 
7371 	s->matched_entry = NULL;
7372 	return NULL;
7373 }
7374 
7375 static int
7376 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7377 {
7378 	regmatch_t regmatch;
7379 
7380 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7381 	    0) == 0;
7382 }
7383 
7384 static const struct got_error *
7385 search_next_ref_view(struct tog_view *view)
7386 {
7387 	struct tog_ref_view_state *s = &view->state.ref;
7388 	struct tog_reflist_entry *re = NULL;
7389 
7390 	if (!view->searching) {
7391 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7392 		return NULL;
7393 	}
7394 
7395 	if (s->matched_entry) {
7396 		if (view->searching == TOG_SEARCH_FORWARD) {
7397 			if (s->selected_entry)
7398 				re = TAILQ_NEXT(s->selected_entry, entry);
7399 			else
7400 				re = TAILQ_PREV(s->selected_entry,
7401 				    tog_reflist_head, entry);
7402 		} else {
7403 			if (s->selected_entry == NULL)
7404 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7405 			else
7406 				re = TAILQ_PREV(s->selected_entry,
7407 				    tog_reflist_head, entry);
7408 		}
7409 	} else {
7410 		if (s->selected_entry)
7411 			re = s->selected_entry;
7412 		else if (view->searching == TOG_SEARCH_FORWARD)
7413 			re = TAILQ_FIRST(&s->refs);
7414 		else
7415 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7416 	}
7417 
7418 	while (1) {
7419 		if (re == NULL) {
7420 			if (s->matched_entry == NULL) {
7421 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7422 				return NULL;
7423 			}
7424 			if (view->searching == TOG_SEARCH_FORWARD)
7425 				re = TAILQ_FIRST(&s->refs);
7426 			else
7427 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7428 		}
7429 
7430 		if (match_reflist_entry(re, &view->regex)) {
7431 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7432 			s->matched_entry = re;
7433 			break;
7434 		}
7435 
7436 		if (view->searching == TOG_SEARCH_FORWARD)
7437 			re = TAILQ_NEXT(re, entry);
7438 		else
7439 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7440 	}
7441 
7442 	if (s->matched_entry) {
7443 		s->first_displayed_entry = s->matched_entry;
7444 		s->selected = 0;
7445 	}
7446 
7447 	return NULL;
7448 }
7449 
7450 static const struct got_error *
7451 show_ref_view(struct tog_view *view)
7452 {
7453 	const struct got_error *err = NULL;
7454 	struct tog_ref_view_state *s = &view->state.ref;
7455 	struct tog_reflist_entry *re;
7456 	char *line = NULL;
7457 	wchar_t *wline;
7458 	struct tog_color *tc;
7459 	int width, n;
7460 	int limit = view->nlines;
7461 
7462 	werase(view->window);
7463 
7464 	s->ndisplayed = 0;
7465 	if (view_is_hsplit_top(view))
7466 		--limit;  /* border */
7467 
7468 	if (limit == 0)
7469 		return NULL;
7470 
7471 	re = s->first_displayed_entry;
7472 
7473 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7474 	    s->nrefs) == -1)
7475 		return got_error_from_errno("asprintf");
7476 
7477 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7478 	if (err) {
7479 		free(line);
7480 		return err;
7481 	}
7482 	if (view_needs_focus_indication(view))
7483 		wstandout(view->window);
7484 	waddwstr(view->window, wline);
7485 	if (view_needs_focus_indication(view))
7486 		wstandend(view->window);
7487 	free(wline);
7488 	wline = NULL;
7489 	free(line);
7490 	line = NULL;
7491 	if (width < view->ncols - 1)
7492 		waddch(view->window, '\n');
7493 	if (--limit <= 0)
7494 		return NULL;
7495 
7496 	n = 0;
7497 	while (re && limit > 0) {
7498 		char *line = NULL;
7499 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7500 
7501 		if (s->show_date) {
7502 			struct got_commit_object *ci;
7503 			struct got_tag_object *tag;
7504 			struct got_object_id *id;
7505 			struct tm tm;
7506 			time_t t;
7507 
7508 			err = got_ref_resolve(&id, s->repo, re->ref);
7509 			if (err)
7510 				return err;
7511 			err = got_object_open_as_tag(&tag, s->repo, id);
7512 			if (err) {
7513 				if (err->code != GOT_ERR_OBJ_TYPE) {
7514 					free(id);
7515 					return err;
7516 				}
7517 				err = got_object_open_as_commit(&ci, s->repo,
7518 				    id);
7519 				if (err) {
7520 					free(id);
7521 					return err;
7522 				}
7523 				t = got_object_commit_get_committer_time(ci);
7524 				got_object_commit_close(ci);
7525 			} else {
7526 				t = got_object_tag_get_tagger_time(tag);
7527 				got_object_tag_close(tag);
7528 			}
7529 			free(id);
7530 			if (gmtime_r(&t, &tm) == NULL)
7531 				return got_error_from_errno("gmtime_r");
7532 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7533 				return got_error(GOT_ERR_NO_SPACE);
7534 		}
7535 		if (got_ref_is_symbolic(re->ref)) {
7536 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7537 			    ymd : "", got_ref_get_name(re->ref),
7538 			    got_ref_get_symref_target(re->ref)) == -1)
7539 				return got_error_from_errno("asprintf");
7540 		} else if (s->show_ids) {
7541 			struct got_object_id *id;
7542 			char *id_str;
7543 			err = got_ref_resolve(&id, s->repo, re->ref);
7544 			if (err)
7545 				return err;
7546 			err = got_object_id_str(&id_str, id);
7547 			if (err) {
7548 				free(id);
7549 				return err;
7550 			}
7551 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7552 			    got_ref_get_name(re->ref), id_str) == -1) {
7553 				err = got_error_from_errno("asprintf");
7554 				free(id);
7555 				free(id_str);
7556 				return err;
7557 			}
7558 			free(id);
7559 			free(id_str);
7560 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7561 		    got_ref_get_name(re->ref)) == -1)
7562 			return got_error_from_errno("asprintf");
7563 
7564 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7565 		    0, 0);
7566 		if (err) {
7567 			free(line);
7568 			return err;
7569 		}
7570 		if (n == s->selected) {
7571 			if (view->focussed)
7572 				wstandout(view->window);
7573 			s->selected_entry = re;
7574 		}
7575 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7576 		if (tc)
7577 			wattr_on(view->window,
7578 			    COLOR_PAIR(tc->colorpair), NULL);
7579 		waddwstr(view->window, wline);
7580 		if (tc)
7581 			wattr_off(view->window,
7582 			    COLOR_PAIR(tc->colorpair), NULL);
7583 		if (width < view->ncols - 1)
7584 			waddch(view->window, '\n');
7585 		if (n == s->selected && view->focussed)
7586 			wstandend(view->window);
7587 		free(line);
7588 		free(wline);
7589 		wline = NULL;
7590 		n++;
7591 		s->ndisplayed++;
7592 		s->last_displayed_entry = re;
7593 
7594 		limit--;
7595 		re = TAILQ_NEXT(re, entry);
7596 	}
7597 
7598 	view_border(view);
7599 	return err;
7600 }
7601 
7602 static const struct got_error *
7603 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7604     struct tog_reflist_entry *re, struct got_repository *repo)
7605 {
7606 	const struct got_error *err = NULL;
7607 	struct got_object_id *commit_id = NULL;
7608 	struct tog_view *tree_view;
7609 
7610 	*new_view = NULL;
7611 
7612 	err = resolve_reflist_entry(&commit_id, re, repo);
7613 	if (err) {
7614 		if (err->code != GOT_ERR_OBJ_TYPE)
7615 			return err;
7616 		else
7617 			return NULL;
7618 	}
7619 
7620 
7621 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7622 	if (tree_view == NULL) {
7623 		err = got_error_from_errno("view_open");
7624 		goto done;
7625 	}
7626 
7627 	err = open_tree_view(tree_view, commit_id,
7628 	    got_ref_get_name(re->ref), repo);
7629 	if (err)
7630 		goto done;
7631 
7632 	*new_view = tree_view;
7633 done:
7634 	free(commit_id);
7635 	return err;
7636 }
7637 static const struct got_error *
7638 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7639 {
7640 	const struct got_error *err = NULL;
7641 	struct tog_ref_view_state *s = &view->state.ref;
7642 	struct tog_view *log_view, *tree_view;
7643 	struct tog_reflist_entry *re;
7644 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7645 
7646 	switch (ch) {
7647 	case 'i':
7648 		s->show_ids = !s->show_ids;
7649 		view->count = 0;
7650 		break;
7651 	case 'm':
7652 		s->show_date = !s->show_date;
7653 		view->count = 0;
7654 		break;
7655 	case 'o':
7656 		s->sort_by_date = !s->sort_by_date;
7657 		view->count = 0;
7658 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7659 		    got_ref_cmp_by_commit_timestamp_descending :
7660 		    tog_ref_cmp_by_name, s->repo);
7661 		if (err)
7662 			break;
7663 		got_reflist_object_id_map_free(tog_refs_idmap);
7664 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7665 		    &tog_refs, s->repo);
7666 		if (err)
7667 			break;
7668 		ref_view_free_refs(s);
7669 		err = ref_view_load_refs(s);
7670 		break;
7671 	case KEY_ENTER:
7672 	case '\r':
7673 		view->count = 0;
7674 		if (!s->selected_entry)
7675 			break;
7676 		if (view_is_parent_view(view))
7677 			view_get_split(view, &begin_y, &begin_x);
7678 
7679 		err = log_ref_entry(&log_view, begin_y, begin_x,
7680 		    s->selected_entry, s->repo);
7681 		if (err)
7682 			break;
7683 
7684 		if (view_is_parent_view(view) &&
7685 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7686 			err = view_init_hsplit(view, begin_y);
7687 			if (err)
7688 				break;
7689 		}
7690 
7691 		view->focussed = 0;
7692 		log_view->focussed = 1;
7693 		log_view->mode = view->mode;
7694 		log_view->nlines = view->lines - begin_y;
7695 		if (view_is_parent_view(view)) {
7696 			view_transfer_size(log_view, view);
7697 			err = view_close_child(view);
7698 			if (err)
7699 				return err;
7700 			err = view_set_child(view, log_view);
7701 			if (err)
7702 				return err;
7703 			view->focus_child = 1;
7704 		} else
7705 			*new_view = log_view;
7706 		break;
7707 	case 't':
7708 		view->count = 0;
7709 		if (!s->selected_entry)
7710 			break;
7711 		if (view_is_parent_view(view))
7712 			view_get_split(view, &begin_y, &begin_x);
7713 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7714 		    s->selected_entry, s->repo);
7715 		if (err || tree_view == NULL)
7716 			break;
7717 		if (view_is_parent_view(view) &&
7718 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7719 			err = view_init_hsplit(view, begin_y);
7720 			if (err)
7721 				break;
7722 		}
7723 		view->focussed = 0;
7724 		tree_view->focussed = 1;
7725 		tree_view->mode = view->mode;
7726 		tree_view->nlines = view->lines - begin_y;
7727 		if (view_is_parent_view(view)) {
7728 			view_transfer_size(tree_view, view);
7729 			err = view_close_child(view);
7730 			if (err)
7731 				return err;
7732 			err = view_set_child(view, tree_view);
7733 			if (err)
7734 				return err;
7735 			view->focus_child = 1;
7736 		} else
7737 			*new_view = tree_view;
7738 		break;
7739 	case 'g':
7740 	case KEY_HOME:
7741 		s->selected = 0;
7742 		view->count = 0;
7743 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7744 		break;
7745 	case 'G':
7746 	case KEY_END: {
7747 		int eos = view->nlines - 1;
7748 
7749 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7750 			--eos;  /* border */
7751 		s->selected = 0;
7752 		view->count = 0;
7753 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7754 		for (n = 0; n < eos; n++) {
7755 			if (re == NULL)
7756 				break;
7757 			s->first_displayed_entry = re;
7758 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7759 		}
7760 		if (n > 0)
7761 			s->selected = n - 1;
7762 		break;
7763 	}
7764 	case 'k':
7765 	case KEY_UP:
7766 	case CTRL('p'):
7767 		if (s->selected > 0) {
7768 			s->selected--;
7769 			break;
7770 		}
7771 		ref_scroll_up(s, 1);
7772 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7773 			view->count = 0;
7774 		break;
7775 	case CTRL('u'):
7776 	case 'u':
7777 		nscroll /= 2;
7778 		/* FALL THROUGH */
7779 	case KEY_PPAGE:
7780 	case CTRL('b'):
7781 	case 'b':
7782 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7783 			s->selected -= MIN(nscroll, s->selected);
7784 		ref_scroll_up(s, MAX(0, nscroll));
7785 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7786 			view->count = 0;
7787 		break;
7788 	case 'j':
7789 	case KEY_DOWN:
7790 	case CTRL('n'):
7791 		if (s->selected < s->ndisplayed - 1) {
7792 			s->selected++;
7793 			break;
7794 		}
7795 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7796 			/* can't scroll any further */
7797 			view->count = 0;
7798 			break;
7799 		}
7800 		ref_scroll_down(view, 1);
7801 		break;
7802 	case CTRL('d'):
7803 	case 'd':
7804 		nscroll /= 2;
7805 		/* FALL THROUGH */
7806 	case KEY_NPAGE:
7807 	case CTRL('f'):
7808 	case 'f':
7809 	case ' ':
7810 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7811 			/* can't scroll any further; move cursor down */
7812 			if (s->selected < s->ndisplayed - 1)
7813 				s->selected += MIN(nscroll,
7814 				    s->ndisplayed - s->selected - 1);
7815 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7816 				s->selected += s->ndisplayed - s->selected - 1;
7817 			view->count = 0;
7818 			break;
7819 		}
7820 		ref_scroll_down(view, nscroll);
7821 		break;
7822 	case CTRL('l'):
7823 		view->count = 0;
7824 		tog_free_refs();
7825 		err = tog_load_refs(s->repo, s->sort_by_date);
7826 		if (err)
7827 			break;
7828 		ref_view_free_refs(s);
7829 		err = ref_view_load_refs(s);
7830 		break;
7831 	case KEY_RESIZE:
7832 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7833 			s->selected = view->nlines - 2;
7834 		break;
7835 	default:
7836 		view->count = 0;
7837 		break;
7838 	}
7839 
7840 	return err;
7841 }
7842 
7843 __dead static void
7844 usage_ref(void)
7845 {
7846 	endwin();
7847 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7848 	    getprogname());
7849 	exit(1);
7850 }
7851 
7852 static const struct got_error *
7853 cmd_ref(int argc, char *argv[])
7854 {
7855 	const struct got_error *error;
7856 	struct got_repository *repo = NULL;
7857 	struct got_worktree *worktree = NULL;
7858 	char *cwd = NULL, *repo_path = NULL;
7859 	int ch;
7860 	struct tog_view *view;
7861 	int *pack_fds = NULL;
7862 
7863 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7864 		switch (ch) {
7865 		case 'r':
7866 			repo_path = realpath(optarg, NULL);
7867 			if (repo_path == NULL)
7868 				return got_error_from_errno2("realpath",
7869 				    optarg);
7870 			break;
7871 		default:
7872 			usage_ref();
7873 			/* NOTREACHED */
7874 		}
7875 	}
7876 
7877 	argc -= optind;
7878 	argv += optind;
7879 
7880 	if (argc > 1)
7881 		usage_ref();
7882 
7883 	error = got_repo_pack_fds_open(&pack_fds);
7884 	if (error != NULL)
7885 		goto done;
7886 
7887 	if (repo_path == NULL) {
7888 		cwd = getcwd(NULL, 0);
7889 		if (cwd == NULL)
7890 			return got_error_from_errno("getcwd");
7891 		error = got_worktree_open(&worktree, cwd);
7892 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7893 			goto done;
7894 		if (worktree)
7895 			repo_path =
7896 			    strdup(got_worktree_get_repo_path(worktree));
7897 		else
7898 			repo_path = strdup(cwd);
7899 		if (repo_path == NULL) {
7900 			error = got_error_from_errno("strdup");
7901 			goto done;
7902 		}
7903 	}
7904 
7905 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7906 	if (error != NULL)
7907 		goto done;
7908 
7909 	init_curses();
7910 
7911 	error = apply_unveil(got_repo_get_path(repo), NULL);
7912 	if (error)
7913 		goto done;
7914 
7915 	error = tog_load_refs(repo, 0);
7916 	if (error)
7917 		goto done;
7918 
7919 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7920 	if (view == NULL) {
7921 		error = got_error_from_errno("view_open");
7922 		goto done;
7923 	}
7924 
7925 	error = open_ref_view(view, repo);
7926 	if (error)
7927 		goto done;
7928 
7929 	if (worktree) {
7930 		/* Release work tree lock. */
7931 		got_worktree_close(worktree);
7932 		worktree = NULL;
7933 	}
7934 	error = view_loop(view);
7935 done:
7936 	free(repo_path);
7937 	free(cwd);
7938 	if (repo) {
7939 		const struct got_error *close_err = got_repo_close(repo);
7940 		if (close_err)
7941 			error = close_err;
7942 	}
7943 	if (pack_fds) {
7944 		const struct got_error *pack_err =
7945 		    got_repo_pack_fds_close(pack_fds);
7946 		if (error == NULL)
7947 			error = pack_err;
7948 	}
7949 	tog_free_refs();
7950 	return error;
7951 }
7952 
7953 /*
7954  * If view was scrolled down to move the selected line into view when opening a
7955  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7956  */
7957 static void
7958 offset_selection_up(struct tog_view *view)
7959 {
7960 	switch (view->type) {
7961 	case TOG_VIEW_BLAME: {
7962 		struct tog_blame_view_state *s = &view->state.blame;
7963 		if (s->first_displayed_line == 1) {
7964 			s->selected_line = MAX(s->selected_line - view->offset,
7965 			    1);
7966 			break;
7967 		}
7968 		if (s->first_displayed_line > view->offset)
7969 			s->first_displayed_line -= view->offset;
7970 		else
7971 			s->first_displayed_line = 1;
7972 		s->selected_line += view->offset;
7973 		break;
7974 	}
7975 	case TOG_VIEW_LOG:
7976 		log_scroll_up(&view->state.log, view->offset);
7977 		view->state.log.selected += view->offset;
7978 		break;
7979 	case TOG_VIEW_REF:
7980 		ref_scroll_up(&view->state.ref, view->offset);
7981 		view->state.ref.selected += view->offset;
7982 		break;
7983 	case TOG_VIEW_TREE:
7984 		tree_scroll_up(&view->state.tree, view->offset);
7985 		view->state.tree.selected += view->offset;
7986 		break;
7987 	default:
7988 		break;
7989 	}
7990 
7991 	view->offset = 0;
7992 }
7993 
7994 /*
7995  * If the selected line is in the section of screen covered by the bottom split,
7996  * scroll down offset lines to move it into view and index its new position.
7997  */
7998 static const struct got_error *
7999 offset_selection_down(struct tog_view *view)
8000 {
8001 	const struct got_error	*err = NULL;
8002 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8003 	int			*selected = NULL;
8004 	int			 header, offset;
8005 
8006 	switch (view->type) {
8007 	case TOG_VIEW_BLAME: {
8008 		struct tog_blame_view_state *s = &view->state.blame;
8009 		header = 3;
8010 		scrolld = NULL;
8011 		if (s->selected_line > view->nlines - header) {
8012 			offset = abs(view->nlines - s->selected_line - header);
8013 			s->first_displayed_line += offset;
8014 			s->selected_line -= offset;
8015 			view->offset = offset;
8016 		}
8017 		break;
8018 	}
8019 	case TOG_VIEW_LOG: {
8020 		struct tog_log_view_state *s = &view->state.log;
8021 		scrolld = &log_scroll_down;
8022 		header = view_is_parent_view(view) ? 3 : 2;
8023 		selected = &s->selected;
8024 		break;
8025 	}
8026 	case TOG_VIEW_REF: {
8027 		struct tog_ref_view_state *s = &view->state.ref;
8028 		scrolld = &ref_scroll_down;
8029 		header = 3;
8030 		selected = &s->selected;
8031 		break;
8032 	}
8033 	case TOG_VIEW_TREE: {
8034 		struct tog_tree_view_state *s = &view->state.tree;
8035 		scrolld = &tree_scroll_down;
8036 		header = 5;
8037 		selected = &s->selected;
8038 		break;
8039 	}
8040 	default:
8041 		selected = NULL;
8042 		scrolld = NULL;
8043 		header = 0;
8044 		break;
8045 	}
8046 
8047 	if (selected && *selected > view->nlines - header) {
8048 		offset = abs(view->nlines - *selected - header);
8049 		view->offset = offset;
8050 		if (scrolld && offset) {
8051 			err = scrolld(view, offset);
8052 			*selected -= offset;
8053 		}
8054 	}
8055 
8056 	return err;
8057 }
8058 
8059 static void
8060 list_commands(FILE *fp)
8061 {
8062 	size_t i;
8063 
8064 	fprintf(fp, "commands:");
8065 	for (i = 0; i < nitems(tog_commands); i++) {
8066 		const struct tog_cmd *cmd = &tog_commands[i];
8067 		fprintf(fp, " %s", cmd->name);
8068 	}
8069 	fputc('\n', fp);
8070 }
8071 
8072 __dead static void
8073 usage(int hflag, int status)
8074 {
8075 	FILE *fp = (status == 0) ? stdout : stderr;
8076 
8077 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8078 	    getprogname());
8079 	if (hflag) {
8080 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8081 		list_commands(fp);
8082 	}
8083 	exit(status);
8084 }
8085 
8086 static char **
8087 make_argv(int argc, ...)
8088 {
8089 	va_list ap;
8090 	char **argv;
8091 	int i;
8092 
8093 	va_start(ap, argc);
8094 
8095 	argv = calloc(argc, sizeof(char *));
8096 	if (argv == NULL)
8097 		err(1, "calloc");
8098 	for (i = 0; i < argc; i++) {
8099 		argv[i] = strdup(va_arg(ap, char *));
8100 		if (argv[i] == NULL)
8101 			err(1, "strdup");
8102 	}
8103 
8104 	va_end(ap);
8105 	return argv;
8106 }
8107 
8108 /*
8109  * Try to convert 'tog path' into a 'tog log path' command.
8110  * The user could simply have mistyped the command rather than knowingly
8111  * provided a path. So check whether argv[0] can in fact be resolved
8112  * to a path in the HEAD commit and print a special error if not.
8113  * This hack is for mpi@ <3
8114  */
8115 static const struct got_error *
8116 tog_log_with_path(int argc, char *argv[])
8117 {
8118 	const struct got_error *error = NULL, *close_err;
8119 	const struct tog_cmd *cmd = NULL;
8120 	struct got_repository *repo = NULL;
8121 	struct got_worktree *worktree = NULL;
8122 	struct got_object_id *commit_id = NULL, *id = NULL;
8123 	struct got_commit_object *commit = NULL;
8124 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8125 	char *commit_id_str = NULL, **cmd_argv = NULL;
8126 	int *pack_fds = NULL;
8127 
8128 	cwd = getcwd(NULL, 0);
8129 	if (cwd == NULL)
8130 		return got_error_from_errno("getcwd");
8131 
8132 	error = got_repo_pack_fds_open(&pack_fds);
8133 	if (error != NULL)
8134 		goto done;
8135 
8136 	error = got_worktree_open(&worktree, cwd);
8137 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8138 		goto done;
8139 
8140 	if (worktree)
8141 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8142 	else
8143 		repo_path = strdup(cwd);
8144 	if (repo_path == NULL) {
8145 		error = got_error_from_errno("strdup");
8146 		goto done;
8147 	}
8148 
8149 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8150 	if (error != NULL)
8151 		goto done;
8152 
8153 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8154 	    repo, worktree);
8155 	if (error)
8156 		goto done;
8157 
8158 	error = tog_load_refs(repo, 0);
8159 	if (error)
8160 		goto done;
8161 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8162 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8163 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8164 	if (error)
8165 		goto done;
8166 
8167 	if (worktree) {
8168 		got_worktree_close(worktree);
8169 		worktree = NULL;
8170 	}
8171 
8172 	error = got_object_open_as_commit(&commit, repo, commit_id);
8173 	if (error)
8174 		goto done;
8175 
8176 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8177 	if (error) {
8178 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8179 			goto done;
8180 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8181 		    getprogname(), argv[0]);
8182 		usage(1, 1);
8183 		/* not reached */
8184 	}
8185 
8186 	close_err = got_repo_close(repo);
8187 	if (error == NULL)
8188 		error = close_err;
8189 	repo = NULL;
8190 
8191 	error = got_object_id_str(&commit_id_str, commit_id);
8192 	if (error)
8193 		goto done;
8194 
8195 	cmd = &tog_commands[0]; /* log */
8196 	argc = 4;
8197 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8198 	error = cmd->cmd_main(argc, cmd_argv);
8199 done:
8200 	if (repo) {
8201 		close_err = got_repo_close(repo);
8202 		if (error == NULL)
8203 			error = close_err;
8204 	}
8205 	if (commit)
8206 		got_object_commit_close(commit);
8207 	if (worktree)
8208 		got_worktree_close(worktree);
8209 	if (pack_fds) {
8210 		const struct got_error *pack_err =
8211 		    got_repo_pack_fds_close(pack_fds);
8212 		if (error == NULL)
8213 			error = pack_err;
8214 	}
8215 	free(id);
8216 	free(commit_id_str);
8217 	free(commit_id);
8218 	free(cwd);
8219 	free(repo_path);
8220 	free(in_repo_path);
8221 	if (cmd_argv) {
8222 		int i;
8223 		for (i = 0; i < argc; i++)
8224 			free(cmd_argv[i]);
8225 		free(cmd_argv);
8226 	}
8227 	tog_free_refs();
8228 	return error;
8229 }
8230 
8231 int
8232 main(int argc, char *argv[])
8233 {
8234 	const struct got_error *error = NULL;
8235 	const struct tog_cmd *cmd = NULL;
8236 	int ch, hflag = 0, Vflag = 0;
8237 	char **cmd_argv = NULL;
8238 	static const struct option longopts[] = {
8239 	    { "version", no_argument, NULL, 'V' },
8240 	    { NULL, 0, NULL, 0}
8241 	};
8242 	char *diff_algo_str = NULL;
8243 
8244 	setlocale(LC_CTYPE, "");
8245 
8246 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8247 		switch (ch) {
8248 		case 'h':
8249 			hflag = 1;
8250 			break;
8251 		case 'V':
8252 			Vflag = 1;
8253 			break;
8254 		default:
8255 			usage(hflag, 1);
8256 			/* NOTREACHED */
8257 		}
8258 	}
8259 
8260 	argc -= optind;
8261 	argv += optind;
8262 	optind = 1;
8263 	optreset = 1;
8264 
8265 	if (Vflag) {
8266 		got_version_print_str();
8267 		return 0;
8268 	}
8269 
8270 #ifndef PROFILE
8271 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8272 	    NULL) == -1)
8273 		err(1, "pledge");
8274 #endif
8275 
8276 	if (argc == 0) {
8277 		if (hflag)
8278 			usage(hflag, 0);
8279 		/* Build an argument vector which runs a default command. */
8280 		cmd = &tog_commands[0];
8281 		argc = 1;
8282 		cmd_argv = make_argv(argc, cmd->name);
8283 	} else {
8284 		size_t i;
8285 
8286 		/* Did the user specify a command? */
8287 		for (i = 0; i < nitems(tog_commands); i++) {
8288 			if (strncmp(tog_commands[i].name, argv[0],
8289 			    strlen(argv[0])) == 0) {
8290 				cmd = &tog_commands[i];
8291 				break;
8292 			}
8293 		}
8294 	}
8295 
8296 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8297 	if (diff_algo_str) {
8298 		if (strcasecmp(diff_algo_str, "patience") == 0)
8299 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8300 		if (strcasecmp(diff_algo_str, "myers") == 0)
8301 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8302 	}
8303 
8304 	if (cmd == NULL) {
8305 		if (argc != 1)
8306 			usage(0, 1);
8307 		/* No command specified; try log with a path */
8308 		error = tog_log_with_path(argc, argv);
8309 	} else {
8310 		if (hflag)
8311 			cmd->cmd_usage();
8312 		else
8313 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8314 	}
8315 
8316 	endwin();
8317 	putchar('\n');
8318 	if (cmd_argv) {
8319 		int i;
8320 		for (i = 0; i < argc; i++)
8321 			free(cmd_argv[i]);
8322 		free(cmd_argv);
8323 	}
8324 
8325 	if (error && error->code != GOT_ERR_CANCELLED)
8326 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8327 	return 0;
8328 }