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