1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 };
107 
108 enum tog_view_mode {
109 	TOG_VIEW_SPLIT_NONE,
110 	TOG_VIEW_SPLIT_VERT,
111 	TOG_VIEW_SPLIT_HRZN
112 };
113 
114 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
115 
116 #define TOG_EOF_STRING	"(END)"
117 
118 struct commit_queue_entry {
119 	TAILQ_ENTRY(commit_queue_entry) entry;
120 	struct got_object_id *id;
121 	struct got_commit_object *commit;
122 	int idx;
123 };
124 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
125 struct commit_queue {
126 	int ncommits;
127 	struct commit_queue_head head;
128 };
129 
130 struct tog_color {
131 	STAILQ_ENTRY(tog_color) entry;
132 	regex_t regex;
133 	short colorpair;
134 };
135 STAILQ_HEAD(tog_colors, tog_color);
136 
137 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
138 static struct got_reflist_object_id_map *tog_refs_idmap;
139 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
140 
141 static const struct got_error *
142 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
143     struct got_reference* re2)
144 {
145 	const char *name1 = got_ref_get_name(re1);
146 	const char *name2 = got_ref_get_name(re2);
147 	int isbackup1, isbackup2;
148 
149 	/* Sort backup refs towards the bottom of the list. */
150 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
151 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
152 	if (!isbackup1 && isbackup2) {
153 		*cmp = -1;
154 		return NULL;
155 	} else if (isbackup1 && !isbackup2) {
156 		*cmp = 1;
157 		return NULL;
158 	}
159 
160 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
161 	return NULL;
162 }
163 
164 static const struct got_error *
165 tog_load_refs(struct got_repository *repo, int sort_by_date)
166 {
167 	const struct got_error *err;
168 
169 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
170 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
171 	    repo);
172 	if (err)
173 		return err;
174 
175 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
176 	    repo);
177 }
178 
179 static void
180 tog_free_refs(void)
181 {
182 	if (tog_refs_idmap) {
183 		got_reflist_object_id_map_free(tog_refs_idmap);
184 		tog_refs_idmap = NULL;
185 	}
186 	got_ref_list_free(&tog_refs);
187 }
188 
189 static const struct got_error *
190 add_color(struct tog_colors *colors, const char *pattern,
191     int idx, short color)
192 {
193 	const struct got_error *err = NULL;
194 	struct tog_color *tc;
195 	int regerr = 0;
196 
197 	if (idx < 1 || idx > COLOR_PAIRS - 1)
198 		return NULL;
199 
200 	init_pair(idx, color, -1);
201 
202 	tc = calloc(1, sizeof(*tc));
203 	if (tc == NULL)
204 		return got_error_from_errno("calloc");
205 	regerr = regcomp(&tc->regex, pattern,
206 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
207 	if (regerr) {
208 		static char regerr_msg[512];
209 		static char err_msg[512];
210 		regerror(regerr, &tc->regex, regerr_msg,
211 		    sizeof(regerr_msg));
212 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
213 		    regerr_msg);
214 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
215 		free(tc);
216 		return err;
217 	}
218 	tc->colorpair = idx;
219 	STAILQ_INSERT_HEAD(colors, tc, entry);
220 	return NULL;
221 }
222 
223 static void
224 free_colors(struct tog_colors *colors)
225 {
226 	struct tog_color *tc;
227 
228 	while (!STAILQ_EMPTY(colors)) {
229 		tc = STAILQ_FIRST(colors);
230 		STAILQ_REMOVE_HEAD(colors, entry);
231 		regfree(&tc->regex);
232 		free(tc);
233 	}
234 }
235 
236 static struct tog_color *
237 get_color(struct tog_colors *colors, int colorpair)
238 {
239 	struct tog_color *tc = NULL;
240 
241 	STAILQ_FOREACH(tc, colors, entry) {
242 		if (tc->colorpair == colorpair)
243 			return tc;
244 	}
245 
246 	return NULL;
247 }
248 
249 static int
250 default_color_value(const char *envvar)
251 {
252 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
253 		return COLOR_MAGENTA;
254 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
255 		return COLOR_CYAN;
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
257 		return COLOR_YELLOW;
258 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
259 		return COLOR_GREEN;
260 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
261 		return COLOR_MAGENTA;
262 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
263 		return COLOR_MAGENTA;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
265 		return COLOR_CYAN;
266 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
267 		return COLOR_GREEN;
268 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
269 		return COLOR_GREEN;
270 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
271 		return COLOR_CYAN;
272 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
273 		return COLOR_YELLOW;
274 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
275 		return COLOR_GREEN;
276 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
279 		return COLOR_YELLOW;
280 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
281 		return COLOR_CYAN;
282 
283 	return -1;
284 }
285 
286 static int
287 get_color_value(const char *envvar)
288 {
289 	const char *val = getenv(envvar);
290 
291 	if (val == NULL)
292 		return default_color_value(envvar);
293 
294 	if (strcasecmp(val, "black") == 0)
295 		return COLOR_BLACK;
296 	if (strcasecmp(val, "red") == 0)
297 		return COLOR_RED;
298 	if (strcasecmp(val, "green") == 0)
299 		return COLOR_GREEN;
300 	if (strcasecmp(val, "yellow") == 0)
301 		return COLOR_YELLOW;
302 	if (strcasecmp(val, "blue") == 0)
303 		return COLOR_BLUE;
304 	if (strcasecmp(val, "magenta") == 0)
305 		return COLOR_MAGENTA;
306 	if (strcasecmp(val, "cyan") == 0)
307 		return COLOR_CYAN;
308 	if (strcasecmp(val, "white") == 0)
309 		return COLOR_WHITE;
310 	if (strcasecmp(val, "default") == 0)
311 		return -1;
312 
313 	return default_color_value(envvar);
314 }
315 
316 
317 struct tog_diff_view_state {
318 	struct got_object_id *id1, *id2;
319 	const char *label1, *label2;
320 	FILE *f, *f1, *f2;
321 	int fd1, fd2;
322 	int first_displayed_line;
323 	int last_displayed_line;
324 	int eof;
325 	int diff_context;
326 	int ignore_whitespace;
327 	int force_text_diff;
328 	struct got_repository *repo;
329 	struct tog_colors colors;
330 	size_t nlines;
331 	off_t *line_offsets;
332 	int matched_line;
333 	int selected_line;
334 
335 	/* passed from log view; may be NULL */
336 	struct tog_view *log_view;
337 };
338 
339 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
340 
341 struct tog_log_thread_args {
342 	pthread_cond_t need_commits;
343 	pthread_cond_t commit_loaded;
344 	int commits_needed;
345 	int load_all;
346 	struct got_commit_graph *graph;
347 	struct commit_queue *commits;
348 	const char *in_repo_path;
349 	struct got_object_id *start_id;
350 	struct got_repository *repo;
351 	int *pack_fds;
352 	int log_complete;
353 	sig_atomic_t *quit;
354 	struct commit_queue_entry **first_displayed_entry;
355 	struct commit_queue_entry **selected_entry;
356 	int *searching;
357 	int *search_next_done;
358 	regex_t *regex;
359 };
360 
361 struct tog_log_view_state {
362 	struct commit_queue commits;
363 	struct commit_queue_entry *first_displayed_entry;
364 	struct commit_queue_entry *last_displayed_entry;
365 	struct commit_queue_entry *selected_entry;
366 	int selected;
367 	char *in_repo_path;
368 	char *head_ref_name;
369 	int log_branches;
370 	struct got_repository *repo;
371 	struct got_object_id *start_id;
372 	sig_atomic_t quit;
373 	pthread_t thread;
374 	struct tog_log_thread_args thread_args;
375 	struct commit_queue_entry *matched_entry;
376 	struct commit_queue_entry *search_entry;
377 	struct tog_colors colors;
378 };
379 
380 #define TOG_COLOR_DIFF_MINUS		1
381 #define TOG_COLOR_DIFF_PLUS		2
382 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
383 #define TOG_COLOR_DIFF_META		4
384 #define TOG_COLOR_TREE_SUBMODULE	5
385 #define TOG_COLOR_TREE_SYMLINK		6
386 #define TOG_COLOR_TREE_DIRECTORY	7
387 #define TOG_COLOR_TREE_EXECUTABLE	8
388 #define TOG_COLOR_COMMIT		9
389 #define TOG_COLOR_AUTHOR		10
390 #define TOG_COLOR_DATE			11
391 #define TOG_COLOR_REFS_HEADS		12
392 #define TOG_COLOR_REFS_TAGS		13
393 #define TOG_COLOR_REFS_REMOTES		14
394 #define TOG_COLOR_REFS_BACKUP		15
395 
396 struct tog_blame_cb_args {
397 	struct tog_blame_line *lines; /* one per line */
398 	int nlines;
399 
400 	struct tog_view *view;
401 	struct got_object_id *commit_id;
402 	int *quit;
403 };
404 
405 struct tog_blame_thread_args {
406 	const char *path;
407 	struct got_repository *repo;
408 	struct tog_blame_cb_args *cb_args;
409 	int *complete;
410 	got_cancel_cb cancel_cb;
411 	void *cancel_arg;
412 };
413 
414 struct tog_blame {
415 	FILE *f;
416 	off_t filesize;
417 	struct tog_blame_line *lines;
418 	int nlines;
419 	off_t *line_offsets;
420 	pthread_t thread;
421 	struct tog_blame_thread_args thread_args;
422 	struct tog_blame_cb_args cb_args;
423 	const char *path;
424 	int *pack_fds;
425 };
426 
427 struct tog_blame_view_state {
428 	int first_displayed_line;
429 	int last_displayed_line;
430 	int selected_line;
431 	int blame_complete;
432 	int eof;
433 	int done;
434 	struct got_object_id_queue blamed_commits;
435 	struct got_object_qid *blamed_commit;
436 	char *path;
437 	struct got_repository *repo;
438 	struct got_object_id *commit_id;
439 	struct tog_blame blame;
440 	int matched_line;
441 	struct tog_colors colors;
442 };
443 
444 struct tog_parent_tree {
445 	TAILQ_ENTRY(tog_parent_tree) entry;
446 	struct got_tree_object *tree;
447 	struct got_tree_entry *first_displayed_entry;
448 	struct got_tree_entry *selected_entry;
449 	int selected;
450 };
451 
452 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
453 
454 struct tog_tree_view_state {
455 	char *tree_label;
456 	struct got_object_id *commit_id;/* commit which this tree belongs to */
457 	struct got_tree_object *root;	/* the commit's root tree entry */
458 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
459 	struct got_tree_entry *first_displayed_entry;
460 	struct got_tree_entry *last_displayed_entry;
461 	struct got_tree_entry *selected_entry;
462 	int ndisplayed, selected, show_ids;
463 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
464 	char *head_ref_name;
465 	struct got_repository *repo;
466 	struct got_tree_entry *matched_entry;
467 	struct tog_colors colors;
468 };
469 
470 struct tog_reflist_entry {
471 	TAILQ_ENTRY(tog_reflist_entry) entry;
472 	struct got_reference *ref;
473 	int idx;
474 };
475 
476 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
477 
478 struct tog_ref_view_state {
479 	struct tog_reflist_head refs;
480 	struct tog_reflist_entry *first_displayed_entry;
481 	struct tog_reflist_entry *last_displayed_entry;
482 	struct tog_reflist_entry *selected_entry;
483 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
484 	struct got_repository *repo;
485 	struct tog_reflist_entry *matched_entry;
486 	struct tog_colors colors;
487 };
488 
489 /*
490  * We implement two types of views: parent views and child views.
491  *
492  * The 'Tab' key switches focus between a parent view and its child view.
493  * Child views are shown side-by-side to their parent view, provided
494  * there is enough screen estate.
495  *
496  * When a new view is opened from within a parent view, this new view
497  * becomes a child view of the parent view, replacing any existing child.
498  *
499  * When a new view is opened from within a child view, this new view
500  * becomes a parent view which will obscure the views below until the
501  * user quits the new parent view by typing 'q'.
502  *
503  * This list of views contains parent views only.
504  * Child views are only pointed to by their parent view.
505  */
506 TAILQ_HEAD(tog_view_list_head, tog_view);
507 
508 struct tog_view {
509 	TAILQ_ENTRY(tog_view) entry;
510 	WINDOW *window;
511 	PANEL *panel;
512 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
513 	int maxx, x; /* max column and current start column */
514 	int lines, cols; /* copies of LINES and COLS */
515 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
516 	int ch, count; /* current keymap and count prefix */
517 	int focussed; /* Only set on one parent or child view at a time. */
518 	int dying;
519 	struct tog_view *parent;
520 	struct tog_view *child;
521 
522 	/*
523 	 * This flag is initially set on parent views when a new child view
524 	 * is created. It gets toggled when the 'Tab' key switches focus
525 	 * between parent and child.
526 	 * The flag indicates whether focus should be passed on to our child
527 	 * view if this parent view gets picked for focus after another parent
528 	 * view was closed. This prevents child views from losing focus in such
529 	 * situations.
530 	 */
531 	int focus_child;
532 
533 	enum tog_view_mode mode;
534 	/* type-specific state */
535 	enum tog_view_type type;
536 	union {
537 		struct tog_diff_view_state diff;
538 		struct tog_log_view_state log;
539 		struct tog_blame_view_state blame;
540 		struct tog_tree_view_state tree;
541 		struct tog_ref_view_state ref;
542 	} state;
543 
544 	const struct got_error *(*show)(struct tog_view *);
545 	const struct got_error *(*input)(struct tog_view **,
546 	    struct tog_view *, int);
547 	const struct got_error *(*reset)(struct tog_view *);
548 	const struct got_error *(*close)(struct tog_view *);
549 
550 	const struct got_error *(*search_start)(struct tog_view *);
551 	const struct got_error *(*search_next)(struct tog_view *);
552 	int search_started;
553 	int searching;
554 #define TOG_SEARCH_FORWARD	1
555 #define TOG_SEARCH_BACKWARD	2
556 	int search_next_done;
557 #define TOG_SEARCH_HAVE_MORE	1
558 #define TOG_SEARCH_NO_MORE	2
559 #define TOG_SEARCH_HAVE_NONE	3
560 	regex_t regex;
561 	regmatch_t regmatch;
562 };
563 
564 static const struct got_error *open_diff_view(struct tog_view *,
565     struct got_object_id *, struct got_object_id *,
566     const char *, const char *, int, int, int, struct tog_view *,
567     struct got_repository *);
568 static const struct got_error *show_diff_view(struct tog_view *);
569 static const struct got_error *input_diff_view(struct tog_view **,
570     struct tog_view *, int);
571 static const struct got_error *reset_diff_view(struct tog_view *);
572 static const struct got_error* close_diff_view(struct tog_view *);
573 static const struct got_error *search_start_diff_view(struct tog_view *);
574 static const struct got_error *search_next_diff_view(struct tog_view *);
575 
576 static const struct got_error *open_log_view(struct tog_view *,
577     struct got_object_id *, struct got_repository *,
578     const char *, const char *, int);
579 static const struct got_error * show_log_view(struct tog_view *);
580 static const struct got_error *input_log_view(struct tog_view **,
581     struct tog_view *, int);
582 static const struct got_error *close_log_view(struct tog_view *);
583 static const struct got_error *search_start_log_view(struct tog_view *);
584 static const struct got_error *search_next_log_view(struct tog_view *);
585 
586 static const struct got_error *open_blame_view(struct tog_view *, char *,
587     struct got_object_id *, struct got_repository *);
588 static const struct got_error *show_blame_view(struct tog_view *);
589 static const struct got_error *input_blame_view(struct tog_view **,
590     struct tog_view *, int);
591 static const struct got_error *reset_blame_view(struct tog_view *);
592 static const struct got_error *close_blame_view(struct tog_view *);
593 static const struct got_error *search_start_blame_view(struct tog_view *);
594 static const struct got_error *search_next_blame_view(struct tog_view *);
595 
596 static const struct got_error *open_tree_view(struct tog_view *,
597     struct got_object_id *, const char *, struct got_repository *);
598 static const struct got_error *show_tree_view(struct tog_view *);
599 static const struct got_error *input_tree_view(struct tog_view **,
600     struct tog_view *, int);
601 static const struct got_error *close_tree_view(struct tog_view *);
602 static const struct got_error *search_start_tree_view(struct tog_view *);
603 static const struct got_error *search_next_tree_view(struct tog_view *);
604 
605 static const struct got_error *open_ref_view(struct tog_view *,
606     struct got_repository *);
607 static const struct got_error *show_ref_view(struct tog_view *);
608 static const struct got_error *input_ref_view(struct tog_view **,
609     struct tog_view *, int);
610 static const struct got_error *close_ref_view(struct tog_view *);
611 static const struct got_error *search_start_ref_view(struct tog_view *);
612 static const struct got_error *search_next_ref_view(struct tog_view *);
613 
614 static volatile sig_atomic_t tog_sigwinch_received;
615 static volatile sig_atomic_t tog_sigpipe_received;
616 static volatile sig_atomic_t tog_sigcont_received;
617 static volatile sig_atomic_t tog_sigint_received;
618 static volatile sig_atomic_t tog_sigterm_received;
619 
620 static void
621 tog_sigwinch(int signo)
622 {
623 	tog_sigwinch_received = 1;
624 }
625 
626 static void
627 tog_sigpipe(int signo)
628 {
629 	tog_sigpipe_received = 1;
630 }
631 
632 static void
633 tog_sigcont(int signo)
634 {
635 	tog_sigcont_received = 1;
636 }
637 
638 static void
639 tog_sigint(int signo)
640 {
641 	tog_sigint_received = 1;
642 }
643 
644 static void
645 tog_sigterm(int signo)
646 {
647 	tog_sigterm_received = 1;
648 }
649 
650 static int
651 tog_fatal_signal_received(void)
652 {
653 	return (tog_sigpipe_received ||
654 	    tog_sigint_received || tog_sigint_received);
655 }
656 
657 static const struct got_error *
658 view_close(struct tog_view *view)
659 {
660 	const struct got_error *err = NULL;
661 
662 	if (view->child) {
663 		view_close(view->child);
664 		view->child = NULL;
665 	}
666 	if (view->close)
667 		err = view->close(view);
668 	if (view->panel)
669 		del_panel(view->panel);
670 	if (view->window)
671 		delwin(view->window);
672 	free(view);
673 	return err;
674 }
675 
676 static struct tog_view *
677 view_open(int nlines, int ncols, int begin_y, int begin_x,
678     enum tog_view_type type)
679 {
680 	struct tog_view *view = calloc(1, sizeof(*view));
681 
682 	if (view == NULL)
683 		return NULL;
684 
685 	view->type = type;
686 	view->lines = LINES;
687 	view->cols = COLS;
688 	view->nlines = nlines ? nlines : LINES - begin_y;
689 	view->ncols = ncols ? ncols : COLS - begin_x;
690 	view->begin_y = begin_y;
691 	view->begin_x = begin_x;
692 	view->window = newwin(nlines, ncols, begin_y, begin_x);
693 	if (view->window == NULL) {
694 		view_close(view);
695 		return NULL;
696 	}
697 	view->panel = new_panel(view->window);
698 	if (view->panel == NULL ||
699 	    set_panel_userptr(view->panel, view) != OK) {
700 		view_close(view);
701 		return NULL;
702 	}
703 
704 	keypad(view->window, TRUE);
705 	return view;
706 }
707 
708 static int
709 view_split_begin_x(int begin_x)
710 {
711 	if (begin_x > 0 || COLS < 120)
712 		return 0;
713 	return (COLS - MAX(COLS / 2, 80));
714 }
715 
716 /* XXX Stub till we decide what to do. */
717 static int
718 view_split_begin_y(int lines)
719 {
720 	return lines * HSPLIT_SCALE;
721 }
722 
723 static const struct got_error *view_resize(struct tog_view *);
724 
725 static const struct got_error *
726 view_splitscreen(struct tog_view *view)
727 {
728 	const struct got_error *err = NULL;
729 
730 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
731 		view->begin_y = view_split_begin_y(view->nlines);
732 		view->begin_x = 0;
733 	} else {
734 		view->begin_x = view_split_begin_x(0);
735 		view->begin_y = 0;
736 	}
737 	view->nlines = LINES - view->begin_y;
738 	view->ncols = COLS - view->begin_x;
739 	view->lines = LINES;
740 	view->cols = COLS;
741 	err = view_resize(view);
742 	if (err)
743 		return err;
744 
745 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
746 		view->parent->nlines = view->begin_y;
747 
748 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
749 		return got_error_from_errno("mvwin");
750 
751 	return NULL;
752 }
753 
754 static const struct got_error *
755 view_fullscreen(struct tog_view *view)
756 {
757 	const struct got_error *err = NULL;
758 
759 	view->begin_x = 0;
760 	view->begin_y = 0;
761 	view->nlines = LINES;
762 	view->ncols = COLS;
763 	view->lines = LINES;
764 	view->cols = COLS;
765 	err = view_resize(view);
766 	if (err)
767 		return err;
768 
769 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
770 		return got_error_from_errno("mvwin");
771 
772 	return NULL;
773 }
774 
775 static int
776 view_is_parent_view(struct tog_view *view)
777 {
778 	return view->parent == NULL;
779 }
780 
781 static int
782 view_is_splitscreen(struct tog_view *view)
783 {
784 	return view->begin_x > 0 || view->begin_y > 0;
785 }
786 
787 static int
788 view_is_fullscreen(struct tog_view *view)
789 {
790 	return view->nlines == LINES && view->ncols == COLS;
791 }
792 
793 static int
794 view_is_hsplit_top(struct tog_view *view)
795 {
796 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
797 	    view_is_splitscreen(view->child);
798 }
799 
800 static void
801 view_border(struct tog_view *view)
802 {
803 	PANEL *panel;
804 	const struct tog_view *view_above;
805 
806 	if (view->parent)
807 		return view_border(view->parent);
808 
809 	panel = panel_above(view->panel);
810 	if (panel == NULL)
811 		return;
812 
813 	view_above = panel_userptr(panel);
814 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
815 		mvwhline(view->window, view_above->begin_y - 1,
816 		    view->begin_x, got_locale_is_utf8() ?
817 		    ACS_HLINE : '-', view->ncols);
818 	else
819 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
820 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
821 }
822 
823 static const struct got_error *request_log_commits(struct tog_view *);
824 static const struct got_error *offset_selection_down(struct tog_view *);
825 static void offset_selection_up(struct tog_view *);
826 
827 static const struct got_error *
828 view_resize(struct tog_view *view)
829 {
830 	const struct got_error	*err = NULL;
831 	int			 dif, nlines, ncols;
832 
833 	dif = LINES - view->lines;  /* line difference */
834 
835 	if (view->lines > LINES)
836 		nlines = view->nlines - (view->lines - LINES);
837 	else
838 		nlines = view->nlines + (LINES - view->lines);
839 	if (view->cols > COLS)
840 		ncols = view->ncols - (view->cols - COLS);
841 	else
842 		ncols = view->ncols + (COLS - view->cols);
843 
844 	if (view->child) {
845 		int hs = view->child->begin_y;
846 
847 		if (!view_is_fullscreen(view))
848 			view->child->begin_x = view_split_begin_x(view->begin_x);
849 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
850 		    view->child->begin_x == 0) {
851 			ncols = COLS;
852 
853 			view_fullscreen(view->child);
854 			if (view->child->focussed)
855 				show_panel(view->child->panel);
856 			else
857 				show_panel(view->panel);
858 		} else {
859 			ncols = view->child->begin_x;
860 
861 			view_splitscreen(view->child);
862 			show_panel(view->child->panel);
863 		}
864 		/*
865 		 * Request commits if terminal height was increased in a log
866 		 * view so we have enough commits loaded to populate the view.
867 		 */
868 		if (view->type == TOG_VIEW_LOG && dif > 0) {
869 			struct tog_log_view_state *ts = &view->state.log;
870 
871 			if (ts->commits.ncommits < ts->selected_entry->idx +
872 			    view->lines - ts->selected) {
873 				view->nscrolled = ts->selected_entry->idx +
874 				    view->lines - ts->selected -
875 				    ts->commits.ncommits + dif;
876 				err = request_log_commits(view);
877 				if (err)
878 					return err;
879 			}
880 		}
881 
882 		/*
883 		 * XXX This is ugly and needs to be moved into the above
884 		 * logic but "works" for now and my attempts at moving it
885 		 * break either 'tab' or 'F' key maps in horizontal splits.
886 		 */
887 		if (hs) {
888 			err = view_splitscreen(view->child);
889 			if (err)
890 				return err;
891 			if (dif < 0) { /* top split decreased */
892 				err = offset_selection_down(view);
893 				if (err)
894 					return err;
895 			}
896 			view_border(view);
897 			update_panels();
898 			doupdate();
899 			show_panel(view->child->panel);
900 			nlines = view->nlines;
901 		}
902 	} else if (view->parent == NULL)
903 		ncols = COLS;
904 
905 	if (wresize(view->window, nlines, ncols) == ERR)
906 		return got_error_from_errno("wresize");
907 	if (replace_panel(view->panel, view->window) == ERR)
908 		return got_error_from_errno("replace_panel");
909 	wclear(view->window);
910 
911 	view->nlines = nlines;
912 	view->ncols = ncols;
913 	view->lines = LINES;
914 	view->cols = COLS;
915 
916 	return NULL;
917 }
918 
919 static const struct got_error *
920 view_close_child(struct tog_view *view)
921 {
922 	const struct got_error *err = NULL;
923 
924 	if (view->child == NULL)
925 		return NULL;
926 
927 	err = view_close(view->child);
928 	view->child = NULL;
929 	return err;
930 }
931 
932 static const struct got_error *
933 view_set_child(struct tog_view *view, struct tog_view *child)
934 {
935 	view->child = child;
936 	child->parent = view;
937 
938 	return view_resize(view);
939 }
940 
941 static void
942 tog_resizeterm(void)
943 {
944 	int cols, lines;
945 	struct winsize size;
946 
947 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
948 		cols = 80;     /* Default */
949 		lines = 24;
950 	} else {
951 		cols = size.ws_col;
952 		lines = size.ws_row;
953 	}
954 	resize_term(lines, cols);
955 }
956 
957 static const struct got_error *
958 view_search_start(struct tog_view *view)
959 {
960 	const struct got_error *err = NULL;
961 	struct tog_view *v = view;
962 	char pattern[1024];
963 	int ret;
964 
965 	if (view->search_started) {
966 		regfree(&view->regex);
967 		view->searching = 0;
968 		memset(&view->regmatch, 0, sizeof(view->regmatch));
969 	}
970 	view->search_started = 0;
971 
972 	if (view->nlines < 1)
973 		return NULL;
974 
975 	if (view_is_hsplit_top(view))
976 		v = view->child;
977 
978 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
979 	wclrtoeol(v->window);
980 
981 	nodelay(view->window, FALSE);  /* block for search term input */
982 	nocbreak();
983 	echo();
984 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
985 	wrefresh(v->window);
986 	cbreak();
987 	noecho();
988 	nodelay(view->window, TRUE);
989 	if (ret == ERR)
990 		return NULL;
991 
992 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
993 		err = view->search_start(view);
994 		if (err) {
995 			regfree(&view->regex);
996 			return err;
997 		}
998 		view->search_started = 1;
999 		view->searching = TOG_SEARCH_FORWARD;
1000 		view->search_next_done = 0;
1001 		view->search_next(view);
1002 	}
1003 
1004 	return NULL;
1005 }
1006 
1007 /*
1008  * Compute view->count from numeric input. Assign total to view->count and
1009  * return first non-numeric key entered.
1010  */
1011 static int
1012 get_compound_key(struct tog_view *view, int c)
1013 {
1014 	struct tog_view	*v = view;
1015 	int		 x, n = 0;
1016 
1017 	if (view_is_hsplit_top(view))
1018 		v = view->child;
1019 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1020 		v = view->parent;
1021 
1022 	view->count = 0;
1023 	cbreak();  /* block for input */
1024 	wmove(v->window, v->nlines - 1, 0);
1025 	wclrtoeol(v->window);
1026 	waddch(v->window, ':');
1027 
1028 	do {
1029 		x = getcurx(v->window);
1030 		if (x != ERR && x < view->ncols) {
1031 			waddch(v->window, c);
1032 			wrefresh(v->window);
1033 		}
1034 
1035 		/*
1036 		 * Don't overflow. Max valid request should be the greatest
1037 		 * between the longest and total lines; cap at 10 million.
1038 		 */
1039 		if (n >= 9999999)
1040 			n = 9999999;
1041 		else
1042 			n = n * 10 + (c - '0');
1043 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1044 
1045 	/* Massage excessive or inapplicable values at the input handler. */
1046 	view->count = n;
1047 
1048 	return c;
1049 }
1050 
1051 static const struct got_error *
1052 view_input(struct tog_view **new, int *done, struct tog_view *view,
1053     struct tog_view_list_head *views)
1054 {
1055 	const struct got_error *err = NULL;
1056 	struct tog_view *v;
1057 	int ch, errcode;
1058 
1059 	*new = NULL;
1060 
1061 	/* Clear "no matches" indicator. */
1062 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1063 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1064 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1065 		view->count = 0;
1066 	}
1067 
1068 	if (view->searching && !view->search_next_done) {
1069 		errcode = pthread_mutex_unlock(&tog_mutex);
1070 		if (errcode)
1071 			return got_error_set_errno(errcode,
1072 			    "pthread_mutex_unlock");
1073 		sched_yield();
1074 		errcode = pthread_mutex_lock(&tog_mutex);
1075 		if (errcode)
1076 			return got_error_set_errno(errcode,
1077 			    "pthread_mutex_lock");
1078 		view->search_next(view);
1079 		return NULL;
1080 	}
1081 
1082 	nodelay(view->window, FALSE);
1083 	/* Allow threads to make progress while we are waiting for input. */
1084 	errcode = pthread_mutex_unlock(&tog_mutex);
1085 	if (errcode)
1086 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1087 	/* If we have an unfinished count, let C-g or backspace abort. */
1088 	if (view->count && --view->count) {
1089 		cbreak();
1090 		nodelay(view->window, TRUE);
1091 		ch = wgetch(view->window);
1092 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1093 			view->count = 0;
1094 		else
1095 			ch = view->ch;
1096 	} else {
1097 		ch = wgetch(view->window);
1098 		if (ch >= '1' && ch  <= '9')
1099 			view->ch = ch = get_compound_key(view, ch);
1100 	}
1101 	errcode = pthread_mutex_lock(&tog_mutex);
1102 	if (errcode)
1103 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1104 	nodelay(view->window, TRUE);
1105 
1106 	if (tog_sigwinch_received || tog_sigcont_received) {
1107 		tog_resizeterm();
1108 		tog_sigwinch_received = 0;
1109 		tog_sigcont_received = 0;
1110 		TAILQ_FOREACH(v, views, entry) {
1111 			err = view_resize(v);
1112 			if (err)
1113 				return err;
1114 			err = v->input(new, v, KEY_RESIZE);
1115 			if (err)
1116 				return err;
1117 			if (v->child) {
1118 				err = view_resize(v->child);
1119 				if (err)
1120 					return err;
1121 				err = v->child->input(new, v->child,
1122 				    KEY_RESIZE);
1123 				if (err)
1124 					return err;
1125 			}
1126 		}
1127 	}
1128 
1129 	switch (ch) {
1130 	case '\t':
1131 		view->count = 0;
1132 		if (view->child) {
1133 			view->focussed = 0;
1134 			view->child->focussed = 1;
1135 			view->focus_child = 1;
1136 		} else if (view->parent) {
1137 			view->focussed = 0;
1138 			view->parent->focussed = 1;
1139 			view->parent->focus_child = 0;
1140 			if (!view_is_splitscreen(view)) {
1141 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1142 				    view->parent->type == TOG_VIEW_LOG) {
1143 					err = request_log_commits(view->parent);
1144 					if (err)
1145 						return err;
1146 				}
1147 				offset_selection_up(view->parent);
1148 				err = view_fullscreen(view->parent);
1149 				if (err)
1150 					return err;
1151 			}
1152 		}
1153 		break;
1154 	case 'q':
1155 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1156 			if (view->parent->type == TOG_VIEW_LOG) {
1157 				/* might need more commits to fill fullscreen */
1158 				err = request_log_commits(view->parent);
1159 				if (err)
1160 					break;
1161 			}
1162 			offset_selection_up(view->parent);
1163 			view->parent->mode = TOG_VIEW_SPLIT_NONE;
1164 		}
1165 		err = view->input(new, view, ch);
1166 		view->dying = 1;
1167 		break;
1168 	case 'Q':
1169 		*done = 1;
1170 		break;
1171 	case 'F':
1172 		view->count = 0;
1173 		if (view_is_parent_view(view)) {
1174 			if (view->child == NULL)
1175 				break;
1176 			if (view_is_splitscreen(view->child)) {
1177 				view->focussed = 0;
1178 				view->child->focussed = 1;
1179 				err = view_fullscreen(view->child);
1180 			} else
1181 				err = view_splitscreen(view->child);
1182 			if (err)
1183 				break;
1184 			err = view->child->input(new, view->child,
1185 			    KEY_RESIZE);
1186 		} else {
1187 			if (view_is_splitscreen(view)) {
1188 				view->parent->focussed = 0;
1189 				view->focussed = 1;
1190 				err = view_fullscreen(view);
1191 			} else {
1192 				err = view_splitscreen(view);
1193 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1194 					err = view_resize(view->parent);
1195 			}
1196 			if (err)
1197 				break;
1198 			err = view->input(new, view, KEY_RESIZE);
1199 		}
1200 		if (err)
1201 			break;
1202 		if (view->type == TOG_VIEW_LOG) {
1203 			err = request_log_commits(view);
1204 			if (err)
1205 				break;
1206 		}
1207 		if (view->parent)
1208 			err = offset_selection_down(view->parent);
1209 		if (!err)
1210 			err = offset_selection_down(view);
1211 		break;
1212 	case KEY_RESIZE:
1213 		break;
1214 	case '/':
1215 		view->count = 0;
1216 		if (view->search_start)
1217 			view_search_start(view);
1218 		else
1219 			err = view->input(new, view, ch);
1220 		break;
1221 	case 'N':
1222 	case 'n':
1223 		if (view->search_started && view->search_next) {
1224 			view->searching = (ch == 'n' ?
1225 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1226 			view->search_next_done = 0;
1227 			view->search_next(view);
1228 		} else
1229 			err = view->input(new, view, ch);
1230 		break;
1231 	case 'A':
1232 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1233 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1234 		else
1235 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1236 		TAILQ_FOREACH(v, views, entry) {
1237 			if (v->reset) {
1238 				err = v->reset(v);
1239 				if (err)
1240 					return err;
1241 			}
1242 			if (v->child && v->child->reset) {
1243 				err = v->child->reset(v->child);
1244 				if (err)
1245 					return err;
1246 			}
1247 		}
1248 		break;
1249 	default:
1250 		err = view->input(new, view, ch);
1251 		break;
1252 	}
1253 
1254 	return err;
1255 }
1256 
1257 static int
1258 view_needs_focus_indication(struct tog_view *view)
1259 {
1260 	if (view_is_parent_view(view)) {
1261 		if (view->child == NULL || view->child->focussed)
1262 			return 0;
1263 		if (!view_is_splitscreen(view->child))
1264 			return 0;
1265 	} else if (!view_is_splitscreen(view))
1266 		return 0;
1267 
1268 	return view->focussed;
1269 }
1270 
1271 static const struct got_error *
1272 view_loop(struct tog_view *view)
1273 {
1274 	const struct got_error *err = NULL;
1275 	struct tog_view_list_head views;
1276 	struct tog_view *new_view;
1277 	int fast_refresh = 10;
1278 	int done = 0, errcode;
1279 
1280 	errcode = pthread_mutex_lock(&tog_mutex);
1281 	if (errcode)
1282 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1283 
1284 	TAILQ_INIT(&views);
1285 	TAILQ_INSERT_HEAD(&views, view, entry);
1286 
1287 	view->focussed = 1;
1288 	err = view->show(view);
1289 	if (err)
1290 		return err;
1291 	update_panels();
1292 	doupdate();
1293 	while (!TAILQ_EMPTY(&views) && !done && !tog_fatal_signal_received()) {
1294 		/* Refresh fast during initialization, then become slower. */
1295 		if (fast_refresh && fast_refresh-- == 0)
1296 			halfdelay(10); /* switch to once per second */
1297 
1298 		err = view_input(&new_view, &done, view, &views);
1299 		if (err)
1300 			break;
1301 		if (view->dying) {
1302 			struct tog_view *v, *prev = NULL;
1303 
1304 			if (view_is_parent_view(view))
1305 				prev = TAILQ_PREV(view, tog_view_list_head,
1306 				    entry);
1307 			else if (view->parent)
1308 				prev = view->parent;
1309 
1310 			if (view->parent) {
1311 				view->parent->child = NULL;
1312 				view->parent->focus_child = 0;
1313 				/* Restore fullscreen line height. */
1314 				view->parent->nlines = view->parent->lines;
1315 				err = view_resize(view->parent);
1316 				if (err)
1317 					break;
1318 			} else
1319 				TAILQ_REMOVE(&views, view, entry);
1320 
1321 			err = view_close(view);
1322 			if (err)
1323 				goto done;
1324 
1325 			view = NULL;
1326 			TAILQ_FOREACH(v, &views, entry) {
1327 				if (v->focussed)
1328 					break;
1329 			}
1330 			if (view == NULL && new_view == NULL) {
1331 				/* No view has focus. Try to pick one. */
1332 				if (prev)
1333 					view = prev;
1334 				else if (!TAILQ_EMPTY(&views)) {
1335 					view = TAILQ_LAST(&views,
1336 					    tog_view_list_head);
1337 				}
1338 				if (view) {
1339 					if (view->focus_child) {
1340 						view->child->focussed = 1;
1341 						view = view->child;
1342 					} else
1343 						view->focussed = 1;
1344 				}
1345 			}
1346 		}
1347 		if (new_view) {
1348 			struct tog_view *v, *t;
1349 			/* Only allow one parent view per type. */
1350 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1351 				if (v->type != new_view->type)
1352 					continue;
1353 				TAILQ_REMOVE(&views, v, entry);
1354 				err = view_close(v);
1355 				if (err)
1356 					goto done;
1357 				break;
1358 			}
1359 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1360 			view = new_view;
1361 		}
1362 		if (view) {
1363 			if (view_is_parent_view(view)) {
1364 				if (view->child && view->child->focussed)
1365 					view = view->child;
1366 			} else {
1367 				if (view->parent && view->parent->focussed)
1368 					view = view->parent;
1369 			}
1370 			show_panel(view->panel);
1371 			if (view->child && view_is_splitscreen(view->child))
1372 				show_panel(view->child->panel);
1373 			if (view->parent && view_is_splitscreen(view)) {
1374 				err = view->parent->show(view->parent);
1375 				if (err)
1376 					goto done;
1377 			}
1378 			err = view->show(view);
1379 			if (err)
1380 				goto done;
1381 			if (view->child) {
1382 				err = view->child->show(view->child);
1383 				if (err)
1384 					goto done;
1385 			}
1386 			update_panels();
1387 			doupdate();
1388 		}
1389 	}
1390 done:
1391 	while (!TAILQ_EMPTY(&views)) {
1392 		view = TAILQ_FIRST(&views);
1393 		TAILQ_REMOVE(&views, view, entry);
1394 		view_close(view);
1395 	}
1396 
1397 	errcode = pthread_mutex_unlock(&tog_mutex);
1398 	if (errcode && err == NULL)
1399 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1400 
1401 	return err;
1402 }
1403 
1404 __dead static void
1405 usage_log(void)
1406 {
1407 	endwin();
1408 	fprintf(stderr,
1409 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1410 	    getprogname());
1411 	exit(1);
1412 }
1413 
1414 /* Create newly allocated wide-character string equivalent to a byte string. */
1415 static const struct got_error *
1416 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1417 {
1418 	char *vis = NULL;
1419 	const struct got_error *err = NULL;
1420 
1421 	*ws = NULL;
1422 	*wlen = mbstowcs(NULL, s, 0);
1423 	if (*wlen == (size_t)-1) {
1424 		int vislen;
1425 		if (errno != EILSEQ)
1426 			return got_error_from_errno("mbstowcs");
1427 
1428 		/* byte string invalid in current encoding; try to "fix" it */
1429 		err = got_mbsavis(&vis, &vislen, s);
1430 		if (err)
1431 			return err;
1432 		*wlen = mbstowcs(NULL, vis, 0);
1433 		if (*wlen == (size_t)-1) {
1434 			err = got_error_from_errno("mbstowcs"); /* give up */
1435 			goto done;
1436 		}
1437 	}
1438 
1439 	*ws = calloc(*wlen + 1, sizeof(**ws));
1440 	if (*ws == NULL) {
1441 		err = got_error_from_errno("calloc");
1442 		goto done;
1443 	}
1444 
1445 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1446 		err = got_error_from_errno("mbstowcs");
1447 done:
1448 	free(vis);
1449 	if (err) {
1450 		free(*ws);
1451 		*ws = NULL;
1452 		*wlen = 0;
1453 	}
1454 	return err;
1455 }
1456 
1457 static const struct got_error *
1458 expand_tab(char **ptr, const char *src)
1459 {
1460 	char	*dst;
1461 	size_t	 len, n, idx = 0, sz = 0;
1462 
1463 	*ptr = NULL;
1464 	n = len = strlen(src);
1465 	dst = malloc(n + 1);
1466 	if (dst == NULL)
1467 		return got_error_from_errno("malloc");
1468 
1469 	while (idx < len && src[idx]) {
1470 		const char c = src[idx];
1471 
1472 		if (c == '\t') {
1473 			size_t nb = TABSIZE - sz % TABSIZE;
1474 			char *p;
1475 
1476 			p = realloc(dst, n + nb);
1477 			if (p == NULL) {
1478 				free(dst);
1479 				return got_error_from_errno("realloc");
1480 
1481 			}
1482 			dst = p;
1483 			n += nb;
1484 			memset(dst + sz, ' ', nb);
1485 			sz += nb;
1486 		} else
1487 			dst[sz++] = src[idx];
1488 		++idx;
1489 	}
1490 
1491 	dst[sz] = '\0';
1492 	*ptr = dst;
1493 	return NULL;
1494 }
1495 
1496 /*
1497  * Advance at most n columns from wline starting at offset off.
1498  * Return the index to the first character after the span operation.
1499  * Return the combined column width of all spanned wide character in
1500  * *rcol.
1501  */
1502 static int
1503 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1504 {
1505 	int width, i, cols = 0;
1506 
1507 	if (n == 0) {
1508 		*rcol = cols;
1509 		return off;
1510 	}
1511 
1512 	for (i = off; wline[i] != L'\0'; ++i) {
1513 		if (wline[i] == L'\t')
1514 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1515 		else
1516 			width = wcwidth(wline[i]);
1517 
1518 		if (width == -1) {
1519 			width = 1;
1520 			wline[i] = L'.';
1521 		}
1522 
1523 		if (cols + width > n)
1524 			break;
1525 		cols += width;
1526 	}
1527 
1528 	*rcol = cols;
1529 	return i;
1530 }
1531 
1532 /*
1533  * Format a line for display, ensuring that it won't overflow a width limit.
1534  * With scrolling, the width returned refers to the scrolled version of the
1535  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1536  */
1537 static const struct got_error *
1538 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1539     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1540 {
1541 	const struct got_error *err = NULL;
1542 	int cols;
1543 	wchar_t *wline = NULL;
1544 	char *exstr = NULL;
1545 	size_t wlen;
1546 	int i, scrollx;
1547 
1548 	*wlinep = NULL;
1549 	*widthp = 0;
1550 
1551 	if (expand) {
1552 		err = expand_tab(&exstr, line);
1553 		if (err)
1554 			return err;
1555 	}
1556 
1557 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1558 	free(exstr);
1559 	if (err)
1560 		return err;
1561 
1562 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1563 
1564 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1565 		wline[wlen - 1] = L'\0';
1566 		wlen--;
1567 	}
1568 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1569 		wline[wlen - 1] = L'\0';
1570 		wlen--;
1571 	}
1572 
1573 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1574 	wline[i] = L'\0';
1575 
1576 	if (widthp)
1577 		*widthp = cols;
1578 	if (scrollxp)
1579 		*scrollxp = scrollx;
1580 	if (err)
1581 		free(wline);
1582 	else
1583 		*wlinep = wline;
1584 	return err;
1585 }
1586 
1587 static const struct got_error*
1588 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1589     struct got_object_id *id, struct got_repository *repo)
1590 {
1591 	static const struct got_error *err = NULL;
1592 	struct got_reflist_entry *re;
1593 	char *s;
1594 	const char *name;
1595 
1596 	*refs_str = NULL;
1597 
1598 	TAILQ_FOREACH(re, refs, entry) {
1599 		struct got_tag_object *tag = NULL;
1600 		struct got_object_id *ref_id;
1601 		int cmp;
1602 
1603 		name = got_ref_get_name(re->ref);
1604 		if (strcmp(name, GOT_REF_HEAD) == 0)
1605 			continue;
1606 		if (strncmp(name, "refs/", 5) == 0)
1607 			name += 5;
1608 		if (strncmp(name, "got/", 4) == 0 &&
1609 		    strncmp(name, "got/backup/", 11) != 0)
1610 			continue;
1611 		if (strncmp(name, "heads/", 6) == 0)
1612 			name += 6;
1613 		if (strncmp(name, "remotes/", 8) == 0) {
1614 			name += 8;
1615 			s = strstr(name, "/" GOT_REF_HEAD);
1616 			if (s != NULL && s[strlen(s)] == '\0')
1617 				continue;
1618 		}
1619 		err = got_ref_resolve(&ref_id, repo, re->ref);
1620 		if (err)
1621 			break;
1622 		if (strncmp(name, "tags/", 5) == 0) {
1623 			err = got_object_open_as_tag(&tag, repo, ref_id);
1624 			if (err) {
1625 				if (err->code != GOT_ERR_OBJ_TYPE) {
1626 					free(ref_id);
1627 					break;
1628 				}
1629 				/* Ref points at something other than a tag. */
1630 				err = NULL;
1631 				tag = NULL;
1632 			}
1633 		}
1634 		cmp = got_object_id_cmp(tag ?
1635 		    got_object_tag_get_object_id(tag) : ref_id, id);
1636 		free(ref_id);
1637 		if (tag)
1638 			got_object_tag_close(tag);
1639 		if (cmp != 0)
1640 			continue;
1641 		s = *refs_str;
1642 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1643 		    s ? ", " : "", name) == -1) {
1644 			err = got_error_from_errno("asprintf");
1645 			free(s);
1646 			*refs_str = NULL;
1647 			break;
1648 		}
1649 		free(s);
1650 	}
1651 
1652 	return err;
1653 }
1654 
1655 static const struct got_error *
1656 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1657     int col_tab_align)
1658 {
1659 	char *smallerthan;
1660 
1661 	smallerthan = strchr(author, '<');
1662 	if (smallerthan && smallerthan[1] != '\0')
1663 		author = smallerthan + 1;
1664 	author[strcspn(author, "@>")] = '\0';
1665 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1666 	    col_tab_align, 0);
1667 }
1668 
1669 static const struct got_error *
1670 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1671     struct got_object_id *id, const size_t date_display_cols,
1672     int author_display_cols)
1673 {
1674 	struct tog_log_view_state *s = &view->state.log;
1675 	const struct got_error *err = NULL;
1676 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1677 	char *logmsg0 = NULL, *logmsg = NULL;
1678 	char *author = NULL;
1679 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1680 	int author_width, logmsg_width;
1681 	char *newline, *line = NULL;
1682 	int col, limit, scrollx;
1683 	const int avail = view->ncols;
1684 	struct tm tm;
1685 	time_t committer_time;
1686 	struct tog_color *tc;
1687 
1688 	committer_time = got_object_commit_get_committer_time(commit);
1689 	if (gmtime_r(&committer_time, &tm) == NULL)
1690 		return got_error_from_errno("gmtime_r");
1691 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1692 		return got_error(GOT_ERR_NO_SPACE);
1693 
1694 	if (avail <= date_display_cols)
1695 		limit = MIN(sizeof(datebuf) - 1, avail);
1696 	else
1697 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1698 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1699 	if (tc)
1700 		wattr_on(view->window,
1701 		    COLOR_PAIR(tc->colorpair), NULL);
1702 	waddnstr(view->window, datebuf, limit);
1703 	if (tc)
1704 		wattr_off(view->window,
1705 		    COLOR_PAIR(tc->colorpair), NULL);
1706 	col = limit;
1707 	if (col > avail)
1708 		goto done;
1709 
1710 	if (avail >= 120) {
1711 		char *id_str;
1712 		err = got_object_id_str(&id_str, id);
1713 		if (err)
1714 			goto done;
1715 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1716 		if (tc)
1717 			wattr_on(view->window,
1718 			    COLOR_PAIR(tc->colorpair), NULL);
1719 		wprintw(view->window, "%.8s ", id_str);
1720 		if (tc)
1721 			wattr_off(view->window,
1722 			    COLOR_PAIR(tc->colorpair), NULL);
1723 		free(id_str);
1724 		col += 9;
1725 		if (col > avail)
1726 			goto done;
1727 	}
1728 
1729 	author = strdup(got_object_commit_get_author(commit));
1730 	if (author == NULL) {
1731 		err = got_error_from_errno("strdup");
1732 		goto done;
1733 	}
1734 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1735 	if (err)
1736 		goto done;
1737 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1738 	if (tc)
1739 		wattr_on(view->window,
1740 		    COLOR_PAIR(tc->colorpair), NULL);
1741 	waddwstr(view->window, wauthor);
1742 	if (tc)
1743 		wattr_off(view->window,
1744 		    COLOR_PAIR(tc->colorpair), NULL);
1745 	col += author_width;
1746 	while (col < avail && author_width < author_display_cols + 2) {
1747 		waddch(view->window, ' ');
1748 		col++;
1749 		author_width++;
1750 	}
1751 	if (col > avail)
1752 		goto done;
1753 
1754 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1755 	if (err)
1756 		goto done;
1757 	logmsg = logmsg0;
1758 	while (*logmsg == '\n')
1759 		logmsg++;
1760 	newline = strchr(logmsg, '\n');
1761 	if (newline)
1762 		*newline = '\0';
1763 	limit = avail - col;
1764 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
1765 		limit--;	/* for the border */
1766 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
1767 	    limit, col, 1);
1768 	if (err)
1769 		goto done;
1770 	waddwstr(view->window, &wlogmsg[scrollx]);
1771 	col += MAX(logmsg_width, 0);
1772 	while (col < avail) {
1773 		waddch(view->window, ' ');
1774 		col++;
1775 	}
1776 done:
1777 	free(logmsg0);
1778 	free(wlogmsg);
1779 	free(author);
1780 	free(wauthor);
1781 	free(line);
1782 	return err;
1783 }
1784 
1785 static struct commit_queue_entry *
1786 alloc_commit_queue_entry(struct got_commit_object *commit,
1787     struct got_object_id *id)
1788 {
1789 	struct commit_queue_entry *entry;
1790 
1791 	entry = calloc(1, sizeof(*entry));
1792 	if (entry == NULL)
1793 		return NULL;
1794 
1795 	entry->id = id;
1796 	entry->commit = commit;
1797 	return entry;
1798 }
1799 
1800 static void
1801 pop_commit(struct commit_queue *commits)
1802 {
1803 	struct commit_queue_entry *entry;
1804 
1805 	entry = TAILQ_FIRST(&commits->head);
1806 	TAILQ_REMOVE(&commits->head, entry, entry);
1807 	got_object_commit_close(entry->commit);
1808 	commits->ncommits--;
1809 	/* Don't free entry->id! It is owned by the commit graph. */
1810 	free(entry);
1811 }
1812 
1813 static void
1814 free_commits(struct commit_queue *commits)
1815 {
1816 	while (!TAILQ_EMPTY(&commits->head))
1817 		pop_commit(commits);
1818 }
1819 
1820 static const struct got_error *
1821 match_commit(int *have_match, struct got_object_id *id,
1822     struct got_commit_object *commit, regex_t *regex)
1823 {
1824 	const struct got_error *err = NULL;
1825 	regmatch_t regmatch;
1826 	char *id_str = NULL, *logmsg = NULL;
1827 
1828 	*have_match = 0;
1829 
1830 	err = got_object_id_str(&id_str, id);
1831 	if (err)
1832 		return err;
1833 
1834 	err = got_object_commit_get_logmsg(&logmsg, commit);
1835 	if (err)
1836 		goto done;
1837 
1838 	if (regexec(regex, got_object_commit_get_author(commit), 1,
1839 	    &regmatch, 0) == 0 ||
1840 	    regexec(regex, got_object_commit_get_committer(commit), 1,
1841 	    &regmatch, 0) == 0 ||
1842 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
1843 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
1844 		*have_match = 1;
1845 done:
1846 	free(id_str);
1847 	free(logmsg);
1848 	return err;
1849 }
1850 
1851 static const struct got_error *
1852 queue_commits(struct tog_log_thread_args *a)
1853 {
1854 	const struct got_error *err = NULL;
1855 
1856 	/*
1857 	 * We keep all commits open throughout the lifetime of the log
1858 	 * view in order to avoid having to re-fetch commits from disk
1859 	 * while updating the display.
1860 	 */
1861 	do {
1862 		struct got_object_id *id;
1863 		struct got_commit_object *commit;
1864 		struct commit_queue_entry *entry;
1865 		int errcode;
1866 
1867 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
1868 		    NULL, NULL);
1869 		if (err || id == NULL)
1870 			break;
1871 
1872 		err = got_object_open_as_commit(&commit, a->repo, id);
1873 		if (err)
1874 			break;
1875 		entry = alloc_commit_queue_entry(commit, id);
1876 		if (entry == NULL) {
1877 			err = got_error_from_errno("alloc_commit_queue_entry");
1878 			break;
1879 		}
1880 
1881 		errcode = pthread_mutex_lock(&tog_mutex);
1882 		if (errcode) {
1883 			err = got_error_set_errno(errcode,
1884 			    "pthread_mutex_lock");
1885 			break;
1886 		}
1887 
1888 		entry->idx = a->commits->ncommits;
1889 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
1890 		a->commits->ncommits++;
1891 
1892 		if (*a->searching == TOG_SEARCH_FORWARD &&
1893 		    !*a->search_next_done) {
1894 			int have_match;
1895 			err = match_commit(&have_match, id, commit, a->regex);
1896 			if (err)
1897 				break;
1898 			if (have_match)
1899 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
1900 		}
1901 
1902 		errcode = pthread_mutex_unlock(&tog_mutex);
1903 		if (errcode && err == NULL)
1904 			err = got_error_set_errno(errcode,
1905 			    "pthread_mutex_unlock");
1906 		if (err)
1907 			break;
1908 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
1909 
1910 	return err;
1911 }
1912 
1913 static void
1914 select_commit(struct tog_log_view_state *s)
1915 {
1916 	struct commit_queue_entry *entry;
1917 	int ncommits = 0;
1918 
1919 	entry = s->first_displayed_entry;
1920 	while (entry) {
1921 		if (ncommits == s->selected) {
1922 			s->selected_entry = entry;
1923 			break;
1924 		}
1925 		entry = TAILQ_NEXT(entry, entry);
1926 		ncommits++;
1927 	}
1928 }
1929 
1930 static const struct got_error *
1931 draw_commits(struct tog_view *view)
1932 {
1933 	const struct got_error *err = NULL;
1934 	struct tog_log_view_state *s = &view->state.log;
1935 	struct commit_queue_entry *entry = s->selected_entry;
1936 	const int limit = view->nlines;
1937 	int width;
1938 	int ncommits, author_cols = 4;
1939 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1940 	char *refs_str = NULL;
1941 	wchar_t *wline;
1942 	struct tog_color *tc;
1943 	static const size_t date_display_cols = 12;
1944 
1945 	if (s->selected_entry &&
1946 	    !(view->searching && view->search_next_done == 0)) {
1947 		struct got_reflist_head *refs;
1948 		err = got_object_id_str(&id_str, s->selected_entry->id);
1949 		if (err)
1950 			return err;
1951 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
1952 		    s->selected_entry->id);
1953 		if (refs) {
1954 			err = build_refs_str(&refs_str, refs,
1955 			    s->selected_entry->id, s->repo);
1956 			if (err)
1957 				goto done;
1958 		}
1959 	}
1960 
1961 	if (s->thread_args.commits_needed == 0)
1962 		halfdelay(10); /* disable fast refresh */
1963 
1964 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
1965 		if (asprintf(&ncommits_str, " [%d/%d] %s",
1966 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
1967 		    (view->searching && !view->search_next_done) ?
1968 		    "searching..." : "loading...") == -1) {
1969 			err = got_error_from_errno("asprintf");
1970 			goto done;
1971 		}
1972 	} else {
1973 		const char *search_str = NULL;
1974 
1975 		if (view->searching) {
1976 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
1977 				search_str = "no more matches";
1978 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
1979 				search_str = "no matches found";
1980 			else if (!view->search_next_done)
1981 				search_str = "searching...";
1982 		}
1983 
1984 		if (asprintf(&ncommits_str, " [%d/%d] %s",
1985 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
1986 		    search_str ? search_str :
1987 		    (refs_str ? refs_str : "")) == -1) {
1988 			err = got_error_from_errno("asprintf");
1989 			goto done;
1990 		}
1991 	}
1992 
1993 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
1994 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
1995 		    "........................................",
1996 		    s->in_repo_path, ncommits_str) == -1) {
1997 			err = got_error_from_errno("asprintf");
1998 			header = NULL;
1999 			goto done;
2000 		}
2001 	} else if (asprintf(&header, "commit %s%s",
2002 	    id_str ? id_str : "........................................",
2003 	    ncommits_str) == -1) {
2004 		err = got_error_from_errno("asprintf");
2005 		header = NULL;
2006 		goto done;
2007 	}
2008 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2009 	if (err)
2010 		goto done;
2011 
2012 	werase(view->window);
2013 
2014 	if (view_needs_focus_indication(view))
2015 		wstandout(view->window);
2016 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2017 	if (tc)
2018 		wattr_on(view->window,
2019 		    COLOR_PAIR(tc->colorpair), NULL);
2020 	waddwstr(view->window, wline);
2021 	if (tc)
2022 		wattr_off(view->window,
2023 		    COLOR_PAIR(tc->colorpair), NULL);
2024 	while (width < view->ncols) {
2025 		waddch(view->window, ' ');
2026 		width++;
2027 	}
2028 	if (view_needs_focus_indication(view))
2029 		wstandend(view->window);
2030 	free(wline);
2031 	if (limit <= 1)
2032 		goto done;
2033 
2034 	/* Grow author column size if necessary, and set view->maxx. */
2035 	entry = s->first_displayed_entry;
2036 	ncommits = 0;
2037 	view->maxx = 0;
2038 	while (entry) {
2039 		char *author, *eol, *msg, *msg0;
2040 		wchar_t *wauthor, *wmsg;
2041 		int width;
2042 		if (ncommits >= limit - 1)
2043 			break;
2044 		author = strdup(got_object_commit_get_author(entry->commit));
2045 		if (author == NULL) {
2046 			err = got_error_from_errno("strdup");
2047 			goto done;
2048 		}
2049 		err = format_author(&wauthor, &width, author, COLS,
2050 		    date_display_cols);
2051 		if (author_cols < width)
2052 			author_cols = width;
2053 		free(wauthor);
2054 		free(author);
2055 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
2056 		if (err)
2057 			goto done;
2058 		msg = msg0;
2059 		while (*msg == '\n')
2060 			++msg;
2061 		if ((eol = strchr(msg, '\n')))
2062 			*eol = '\0';
2063 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2064 		    date_display_cols + author_cols, 0);
2065 		if (err)
2066 			goto done;
2067 		view->maxx = MAX(view->maxx, width);
2068 		free(msg0);
2069 		free(wmsg);
2070 		ncommits++;
2071 		entry = TAILQ_NEXT(entry, entry);
2072 	}
2073 
2074 	entry = s->first_displayed_entry;
2075 	s->last_displayed_entry = s->first_displayed_entry;
2076 	ncommits = 0;
2077 	while (entry) {
2078 		if (ncommits >= limit - 1)
2079 			break;
2080 		if (ncommits == s->selected)
2081 			wstandout(view->window);
2082 		err = draw_commit(view, entry->commit, entry->id,
2083 		    date_display_cols, author_cols);
2084 		if (ncommits == s->selected)
2085 			wstandend(view->window);
2086 		if (err)
2087 			goto done;
2088 		ncommits++;
2089 		s->last_displayed_entry = entry;
2090 		entry = TAILQ_NEXT(entry, entry);
2091 	}
2092 
2093 	view_border(view);
2094 done:
2095 	free(id_str);
2096 	free(refs_str);
2097 	free(ncommits_str);
2098 	free(header);
2099 	return err;
2100 }
2101 
2102 static void
2103 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2104 {
2105 	struct commit_queue_entry *entry;
2106 	int nscrolled = 0;
2107 
2108 	entry = TAILQ_FIRST(&s->commits.head);
2109 	if (s->first_displayed_entry == entry)
2110 		return;
2111 
2112 	entry = s->first_displayed_entry;
2113 	while (entry && nscrolled < maxscroll) {
2114 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2115 		if (entry) {
2116 			s->first_displayed_entry = entry;
2117 			nscrolled++;
2118 		}
2119 	}
2120 }
2121 
2122 static const struct got_error *
2123 trigger_log_thread(struct tog_view *view, int wait)
2124 {
2125 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2126 	int errcode;
2127 
2128 	halfdelay(1); /* fast refresh while loading commits */
2129 
2130 	while (ta->commits_needed > 0 || ta->load_all) {
2131 		if (ta->log_complete)
2132 			break;
2133 
2134 		/* Wake the log thread. */
2135 		errcode = pthread_cond_signal(&ta->need_commits);
2136 		if (errcode)
2137 			return got_error_set_errno(errcode,
2138 			    "pthread_cond_signal");
2139 
2140 		/*
2141 		 * The mutex will be released while the view loop waits
2142 		 * in wgetch(), at which time the log thread will run.
2143 		 */
2144 		if (!wait)
2145 			break;
2146 
2147 		/* Display progress update in log view. */
2148 		show_log_view(view);
2149 		update_panels();
2150 		doupdate();
2151 
2152 		/* Wait right here while next commit is being loaded. */
2153 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2154 		if (errcode)
2155 			return got_error_set_errno(errcode,
2156 			    "pthread_cond_wait");
2157 
2158 		/* Display progress update in log view. */
2159 		show_log_view(view);
2160 		update_panels();
2161 		doupdate();
2162 	}
2163 
2164 	return NULL;
2165 }
2166 
2167 static const struct got_error *
2168 request_log_commits(struct tog_view *view)
2169 {
2170 	struct tog_log_view_state	*state = &view->state.log;
2171 	const struct got_error		*err = NULL;
2172 
2173 	state->thread_args.commits_needed = view->nscrolled;
2174 	err = trigger_log_thread(view, 1);
2175 	view->nscrolled = 0;
2176 
2177 	return err;
2178 }
2179 
2180 static const struct got_error *
2181 log_scroll_down(struct tog_view *view, int maxscroll)
2182 {
2183 	struct tog_log_view_state *s = &view->state.log;
2184 	const struct got_error *err = NULL;
2185 	struct commit_queue_entry *pentry;
2186 	int nscrolled = 0, ncommits_needed;
2187 
2188 	if (s->last_displayed_entry == NULL)
2189 		return NULL;
2190 
2191 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2192 	if (s->commits.ncommits < ncommits_needed &&
2193 	    !s->thread_args.log_complete) {
2194 		/*
2195 		 * Ask the log thread for required amount of commits.
2196 		 */
2197 		s->thread_args.commits_needed += maxscroll;
2198 		err = trigger_log_thread(view, 1);
2199 		if (err)
2200 			return err;
2201 	}
2202 
2203 	do {
2204 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2205 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2206 			break;
2207 
2208 		s->last_displayed_entry = pentry ?
2209 		    pentry : s->last_displayed_entry;;
2210 
2211 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2212 		if (pentry == NULL)
2213 			break;
2214 		s->first_displayed_entry = pentry;
2215 	} while (++nscrolled < maxscroll);
2216 
2217 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
2218 		view->nscrolled += nscrolled;
2219 	else
2220 		view->nscrolled = 0;
2221 
2222 	return err;
2223 }
2224 
2225 static const struct got_error *
2226 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2227     struct got_commit_object *commit, struct got_object_id *commit_id,
2228     struct tog_view *log_view, struct got_repository *repo)
2229 {
2230 	const struct got_error *err;
2231 	struct got_object_qid *parent_id;
2232 	struct tog_view *diff_view;
2233 
2234 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2235 	if (diff_view == NULL)
2236 		return got_error_from_errno("view_open");
2237 
2238 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2239 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2240 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2241 	if (err == NULL)
2242 		*new_view = diff_view;
2243 	return err;
2244 }
2245 
2246 static const struct got_error *
2247 tree_view_visit_subtree(struct tog_tree_view_state *s,
2248     struct got_tree_object *subtree)
2249 {
2250 	struct tog_parent_tree *parent;
2251 
2252 	parent = calloc(1, sizeof(*parent));
2253 	if (parent == NULL)
2254 		return got_error_from_errno("calloc");
2255 
2256 	parent->tree = s->tree;
2257 	parent->first_displayed_entry = s->first_displayed_entry;
2258 	parent->selected_entry = s->selected_entry;
2259 	parent->selected = s->selected;
2260 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2261 	s->tree = subtree;
2262 	s->selected = 0;
2263 	s->first_displayed_entry = NULL;
2264 	return NULL;
2265 }
2266 
2267 static const struct got_error *
2268 tree_view_walk_path(struct tog_tree_view_state *s,
2269     struct got_commit_object *commit, const char *path)
2270 {
2271 	const struct got_error *err = NULL;
2272 	struct got_tree_object *tree = NULL;
2273 	const char *p;
2274 	char *slash, *subpath = NULL;
2275 
2276 	/* Walk the path and open corresponding tree objects. */
2277 	p = path;
2278 	while (*p) {
2279 		struct got_tree_entry *te;
2280 		struct got_object_id *tree_id;
2281 		char *te_name;
2282 
2283 		while (p[0] == '/')
2284 			p++;
2285 
2286 		/* Ensure the correct subtree entry is selected. */
2287 		slash = strchr(p, '/');
2288 		if (slash == NULL)
2289 			te_name = strdup(p);
2290 		else
2291 			te_name = strndup(p, slash - p);
2292 		if (te_name == NULL) {
2293 			err = got_error_from_errno("strndup");
2294 			break;
2295 		}
2296 		te = got_object_tree_find_entry(s->tree, te_name);
2297 		if (te == NULL) {
2298 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2299 			free(te_name);
2300 			break;
2301 		}
2302 		free(te_name);
2303 		s->first_displayed_entry = s->selected_entry = te;
2304 
2305 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2306 			break; /* jump to this file's entry */
2307 
2308 		slash = strchr(p, '/');
2309 		if (slash)
2310 			subpath = strndup(path, slash - path);
2311 		else
2312 			subpath = strdup(path);
2313 		if (subpath == NULL) {
2314 			err = got_error_from_errno("strdup");
2315 			break;
2316 		}
2317 
2318 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2319 		    subpath);
2320 		if (err)
2321 			break;
2322 
2323 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2324 		free(tree_id);
2325 		if (err)
2326 			break;
2327 
2328 		err = tree_view_visit_subtree(s, tree);
2329 		if (err) {
2330 			got_object_tree_close(tree);
2331 			break;
2332 		}
2333 		if (slash == NULL)
2334 			break;
2335 		free(subpath);
2336 		subpath = NULL;
2337 		p = slash;
2338 	}
2339 
2340 	free(subpath);
2341 	return err;
2342 }
2343 
2344 static const struct got_error *
2345 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2346     struct commit_queue_entry *entry, const char *path,
2347     const char *head_ref_name, struct got_repository *repo)
2348 {
2349 	const struct got_error *err = NULL;
2350 	struct tog_tree_view_state *s;
2351 	struct tog_view *tree_view;
2352 
2353 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2354 	if (tree_view == NULL)
2355 		return got_error_from_errno("view_open");
2356 
2357 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2358 	if (err)
2359 		return err;
2360 	s = &tree_view->state.tree;
2361 
2362 	*new_view = tree_view;
2363 
2364 	if (got_path_is_root_dir(path))
2365 		return NULL;
2366 
2367 	return tree_view_walk_path(s, entry->commit, path);
2368 }
2369 
2370 static const struct got_error *
2371 block_signals_used_by_main_thread(void)
2372 {
2373 	sigset_t sigset;
2374 	int errcode;
2375 
2376 	if (sigemptyset(&sigset) == -1)
2377 		return got_error_from_errno("sigemptyset");
2378 
2379 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2380 	if (sigaddset(&sigset, SIGWINCH) == -1)
2381 		return got_error_from_errno("sigaddset");
2382 	if (sigaddset(&sigset, SIGCONT) == -1)
2383 		return got_error_from_errno("sigaddset");
2384 	if (sigaddset(&sigset, SIGINT) == -1)
2385 		return got_error_from_errno("sigaddset");
2386 	if (sigaddset(&sigset, SIGTERM) == -1)
2387 		return got_error_from_errno("sigaddset");
2388 
2389 	/* ncurses handles SIGTSTP */
2390 	if (sigaddset(&sigset, SIGTSTP) == -1)
2391 		return got_error_from_errno("sigaddset");
2392 
2393 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2394 	if (errcode)
2395 		return got_error_set_errno(errcode, "pthread_sigmask");
2396 
2397 	return NULL;
2398 }
2399 
2400 static void *
2401 log_thread(void *arg)
2402 {
2403 	const struct got_error *err = NULL;
2404 	int errcode = 0;
2405 	struct tog_log_thread_args *a = arg;
2406 	int done = 0;
2407 
2408 	err = block_signals_used_by_main_thread();
2409 	if (err)
2410 		return (void *)err;
2411 
2412 	while (!done && !err && !tog_fatal_signal_received()) {
2413 		err = queue_commits(a);
2414 		if (err) {
2415 			if (err->code != GOT_ERR_ITER_COMPLETED)
2416 				return (void *)err;
2417 			err = NULL;
2418 			done = 1;
2419 		} else if (a->commits_needed > 0 && !a->load_all)
2420 			a->commits_needed--;
2421 
2422 		errcode = pthread_mutex_lock(&tog_mutex);
2423 		if (errcode) {
2424 			err = got_error_set_errno(errcode,
2425 			    "pthread_mutex_lock");
2426 			break;
2427 		} else if (*a->quit)
2428 			done = 1;
2429 		else if (*a->first_displayed_entry == NULL) {
2430 			*a->first_displayed_entry =
2431 			    TAILQ_FIRST(&a->commits->head);
2432 			*a->selected_entry = *a->first_displayed_entry;
2433 		}
2434 
2435 		errcode = pthread_cond_signal(&a->commit_loaded);
2436 		if (errcode) {
2437 			err = got_error_set_errno(errcode,
2438 			    "pthread_cond_signal");
2439 			pthread_mutex_unlock(&tog_mutex);
2440 			break;
2441 		}
2442 
2443 		if (done)
2444 			a->commits_needed = 0;
2445 		else {
2446 			if (a->commits_needed == 0 && !a->load_all) {
2447 				errcode = pthread_cond_wait(&a->need_commits,
2448 				    &tog_mutex);
2449 				if (errcode)
2450 					err = got_error_set_errno(errcode,
2451 					    "pthread_cond_wait");
2452 				if (*a->quit)
2453 					done = 1;
2454 			}
2455 		}
2456 
2457 		errcode = pthread_mutex_unlock(&tog_mutex);
2458 		if (errcode && err == NULL)
2459 			err = got_error_set_errno(errcode,
2460 			    "pthread_mutex_unlock");
2461 	}
2462 	a->log_complete = 1;
2463 	return (void *)err;
2464 }
2465 
2466 static const struct got_error *
2467 stop_log_thread(struct tog_log_view_state *s)
2468 {
2469 	const struct got_error *err = NULL;
2470 	int errcode;
2471 
2472 	if (s->thread) {
2473 		s->quit = 1;
2474 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2475 		if (errcode)
2476 			return got_error_set_errno(errcode,
2477 			    "pthread_cond_signal");
2478 		errcode = pthread_mutex_unlock(&tog_mutex);
2479 		if (errcode)
2480 			return got_error_set_errno(errcode,
2481 			    "pthread_mutex_unlock");
2482 		errcode = pthread_join(s->thread, (void **)&err);
2483 		if (errcode)
2484 			return got_error_set_errno(errcode, "pthread_join");
2485 		errcode = pthread_mutex_lock(&tog_mutex);
2486 		if (errcode)
2487 			return got_error_set_errno(errcode,
2488 			    "pthread_mutex_lock");
2489 		s->thread = NULL;
2490 	}
2491 
2492 	if (s->thread_args.repo) {
2493 		err = got_repo_close(s->thread_args.repo);
2494 		s->thread_args.repo = NULL;
2495 	}
2496 
2497 	if (s->thread_args.pack_fds) {
2498 		const struct got_error *pack_err =
2499 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2500 		if (err == NULL)
2501 			err = pack_err;
2502 		s->thread_args.pack_fds = NULL;
2503 	}
2504 
2505 	if (s->thread_args.graph) {
2506 		got_commit_graph_close(s->thread_args.graph);
2507 		s->thread_args.graph = NULL;
2508 	}
2509 
2510 	return err;
2511 }
2512 
2513 static const struct got_error *
2514 close_log_view(struct tog_view *view)
2515 {
2516 	const struct got_error *err = NULL;
2517 	struct tog_log_view_state *s = &view->state.log;
2518 	int errcode;
2519 
2520 	err = stop_log_thread(s);
2521 
2522 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2523 	if (errcode && err == NULL)
2524 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2525 
2526 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2527 	if (errcode && err == NULL)
2528 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2529 
2530 	free_commits(&s->commits);
2531 	free(s->in_repo_path);
2532 	s->in_repo_path = NULL;
2533 	free(s->start_id);
2534 	s->start_id = NULL;
2535 	free(s->head_ref_name);
2536 	s->head_ref_name = NULL;
2537 	return err;
2538 }
2539 
2540 static const struct got_error *
2541 search_start_log_view(struct tog_view *view)
2542 {
2543 	struct tog_log_view_state *s = &view->state.log;
2544 
2545 	s->matched_entry = NULL;
2546 	s->search_entry = NULL;
2547 	return NULL;
2548 }
2549 
2550 static const struct got_error *
2551 search_next_log_view(struct tog_view *view)
2552 {
2553 	const struct got_error *err = NULL;
2554 	struct tog_log_view_state *s = &view->state.log;
2555 	struct commit_queue_entry *entry;
2556 
2557 	/* Display progress update in log view. */
2558 	show_log_view(view);
2559 	update_panels();
2560 	doupdate();
2561 
2562 	if (s->search_entry) {
2563 		int errcode, ch;
2564 		errcode = pthread_mutex_unlock(&tog_mutex);
2565 		if (errcode)
2566 			return got_error_set_errno(errcode,
2567 			    "pthread_mutex_unlock");
2568 		ch = wgetch(view->window);
2569 		errcode = pthread_mutex_lock(&tog_mutex);
2570 		if (errcode)
2571 			return got_error_set_errno(errcode,
2572 			    "pthread_mutex_lock");
2573 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2574 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2575 			return NULL;
2576 		}
2577 		if (view->searching == TOG_SEARCH_FORWARD)
2578 			entry = TAILQ_NEXT(s->search_entry, entry);
2579 		else
2580 			entry = TAILQ_PREV(s->search_entry,
2581 			    commit_queue_head, entry);
2582 	} else if (s->matched_entry) {
2583 		int matched_idx = s->matched_entry->idx;
2584 		int selected_idx = s->selected_entry->idx;
2585 
2586 		/*
2587 		 * If the user has moved the cursor after we hit a match,
2588 		 * the position from where we should continue searching
2589 		 * might have changed.
2590 		 */
2591 		if (view->searching == TOG_SEARCH_FORWARD) {
2592 			if (matched_idx > selected_idx)
2593 				entry = TAILQ_NEXT(s->selected_entry, entry);
2594 			else
2595 				entry = TAILQ_NEXT(s->matched_entry, entry);
2596 		} else {
2597 			if (matched_idx < selected_idx)
2598 				entry = TAILQ_PREV(s->selected_entry,
2599 						commit_queue_head, entry);
2600 			else
2601 				entry = TAILQ_PREV(s->matched_entry,
2602 						commit_queue_head, entry);
2603 		}
2604 	} else {
2605 		entry = s->selected_entry;
2606 	}
2607 
2608 	while (1) {
2609 		int have_match = 0;
2610 
2611 		if (entry == NULL) {
2612 			if (s->thread_args.log_complete ||
2613 			    view->searching == TOG_SEARCH_BACKWARD) {
2614 				view->search_next_done =
2615 				    (s->matched_entry == NULL ?
2616 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2617 				s->search_entry = NULL;
2618 				return NULL;
2619 			}
2620 			/*
2621 			 * Poke the log thread for more commits and return,
2622 			 * allowing the main loop to make progress. Search
2623 			 * will resume at s->search_entry once we come back.
2624 			 */
2625 			s->thread_args.commits_needed++;
2626 			return trigger_log_thread(view, 0);
2627 		}
2628 
2629 		err = match_commit(&have_match, entry->id, entry->commit,
2630 		    &view->regex);
2631 		if (err)
2632 			break;
2633 		if (have_match) {
2634 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2635 			s->matched_entry = entry;
2636 			break;
2637 		}
2638 
2639 		s->search_entry = entry;
2640 		if (view->searching == TOG_SEARCH_FORWARD)
2641 			entry = TAILQ_NEXT(entry, entry);
2642 		else
2643 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2644 	}
2645 
2646 	if (s->matched_entry) {
2647 		int cur = s->selected_entry->idx;
2648 		while (cur < s->matched_entry->idx) {
2649 			err = input_log_view(NULL, view, KEY_DOWN);
2650 			if (err)
2651 				return err;
2652 			cur++;
2653 		}
2654 		while (cur > s->matched_entry->idx) {
2655 			err = input_log_view(NULL, view, KEY_UP);
2656 			if (err)
2657 				return err;
2658 			cur--;
2659 		}
2660 	}
2661 
2662 	s->search_entry = NULL;
2663 
2664 	return NULL;
2665 }
2666 
2667 static const struct got_error *
2668 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2669     struct got_repository *repo, const char *head_ref_name,
2670     const char *in_repo_path, int log_branches)
2671 {
2672 	const struct got_error *err = NULL;
2673 	struct tog_log_view_state *s = &view->state.log;
2674 	struct got_repository *thread_repo = NULL;
2675 	struct got_commit_graph *thread_graph = NULL;
2676 	int errcode;
2677 
2678 	if (in_repo_path != s->in_repo_path) {
2679 		free(s->in_repo_path);
2680 		s->in_repo_path = strdup(in_repo_path);
2681 		if (s->in_repo_path == NULL)
2682 			return got_error_from_errno("strdup");
2683 	}
2684 
2685 	/* The commit queue only contains commits being displayed. */
2686 	TAILQ_INIT(&s->commits.head);
2687 	s->commits.ncommits = 0;
2688 
2689 	s->repo = repo;
2690 	if (head_ref_name) {
2691 		s->head_ref_name = strdup(head_ref_name);
2692 		if (s->head_ref_name == NULL) {
2693 			err = got_error_from_errno("strdup");
2694 			goto done;
2695 		}
2696 	}
2697 	s->start_id = got_object_id_dup(start_id);
2698 	if (s->start_id == NULL) {
2699 		err = got_error_from_errno("got_object_id_dup");
2700 		goto done;
2701 	}
2702 	s->log_branches = log_branches;
2703 
2704 	STAILQ_INIT(&s->colors);
2705 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2706 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2707 		    get_color_value("TOG_COLOR_COMMIT"));
2708 		if (err)
2709 			goto done;
2710 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2711 		    get_color_value("TOG_COLOR_AUTHOR"));
2712 		if (err) {
2713 			free_colors(&s->colors);
2714 			goto done;
2715 		}
2716 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2717 		    get_color_value("TOG_COLOR_DATE"));
2718 		if (err) {
2719 			free_colors(&s->colors);
2720 			goto done;
2721 		}
2722 	}
2723 
2724 	view->show = show_log_view;
2725 	view->input = input_log_view;
2726 	view->close = close_log_view;
2727 	view->search_start = search_start_log_view;
2728 	view->search_next = search_next_log_view;
2729 
2730 	if (s->thread_args.pack_fds == NULL) {
2731 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2732 		if (err)
2733 			goto done;
2734 	}
2735 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
2736 	    s->thread_args.pack_fds);
2737 	if (err)
2738 		goto done;
2739 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
2740 	    !s->log_branches);
2741 	if (err)
2742 		goto done;
2743 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
2744 	    s->repo, NULL, NULL);
2745 	if (err)
2746 		goto done;
2747 
2748 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
2749 	if (errcode) {
2750 		err = got_error_set_errno(errcode, "pthread_cond_init");
2751 		goto done;
2752 	}
2753 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
2754 	if (errcode) {
2755 		err = got_error_set_errno(errcode, "pthread_cond_init");
2756 		goto done;
2757 	}
2758 
2759 	s->thread_args.commits_needed = view->nlines;
2760 	s->thread_args.graph = thread_graph;
2761 	s->thread_args.commits = &s->commits;
2762 	s->thread_args.in_repo_path = s->in_repo_path;
2763 	s->thread_args.start_id = s->start_id;
2764 	s->thread_args.repo = thread_repo;
2765 	s->thread_args.log_complete = 0;
2766 	s->thread_args.quit = &s->quit;
2767 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
2768 	s->thread_args.selected_entry = &s->selected_entry;
2769 	s->thread_args.searching = &view->searching;
2770 	s->thread_args.search_next_done = &view->search_next_done;
2771 	s->thread_args.regex = &view->regex;
2772 done:
2773 	if (err)
2774 		close_log_view(view);
2775 	return err;
2776 }
2777 
2778 static const struct got_error *
2779 show_log_view(struct tog_view *view)
2780 {
2781 	const struct got_error *err;
2782 	struct tog_log_view_state *s = &view->state.log;
2783 
2784 	if (s->thread == NULL) {
2785 		int errcode = pthread_create(&s->thread, NULL, log_thread,
2786 		    &s->thread_args);
2787 		if (errcode)
2788 			return got_error_set_errno(errcode, "pthread_create");
2789 		if (s->thread_args.commits_needed > 0) {
2790 			err = trigger_log_thread(view, 1);
2791 			if (err)
2792 				return err;
2793 		}
2794 	}
2795 
2796 	return draw_commits(view);
2797 }
2798 
2799 static void
2800 log_move_cursor_up(struct tog_view *view, int page, int home)
2801 {
2802 	struct tog_log_view_state *s = &view->state.log;
2803 
2804 	if (s->selected_entry->idx == 0)
2805 		view->count = 0;
2806 	if (s->first_displayed_entry == NULL)
2807 		return;
2808 
2809 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
2810 	    || home)
2811 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
2812 
2813 	if (!page && !home && s->selected > 0)
2814 		--s->selected;
2815 	else
2816 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
2817 
2818 	select_commit(s);
2819 	return;
2820 }
2821 
2822 static const struct got_error *
2823 log_move_cursor_down(struct tog_view *view, int page)
2824 {
2825 	struct tog_log_view_state	*s = &view->state.log;
2826 	struct commit_queue_entry	*first;
2827 	const struct got_error		*err = NULL;
2828 
2829 	first = s->first_displayed_entry;
2830 	if (first == NULL) {
2831 		view->count = 0;
2832 		return NULL;
2833 	}
2834 
2835 	if (s->thread_args.log_complete &&
2836 	    s->selected_entry->idx >= s->commits.ncommits - 1)
2837 		return NULL;
2838 
2839 	if (!page) {
2840 		int eos = view->nlines - 2;
2841 
2842 		if (view_is_hsplit_top(view))
2843 			--eos;  /* border consumes the last line */
2844 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
2845 			++s->selected;
2846 		else
2847 			err = log_scroll_down(view, 1);
2848 	} else if (s->thread_args.load_all) {
2849 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
2850 			s->selected += MIN(s->last_displayed_entry->idx -
2851 			    s->selected_entry->idx, page + 1);
2852 		else
2853 			err = log_scroll_down(view, MIN(page,
2854 			    s->commits.ncommits - s->selected_entry->idx - 1));
2855 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
2856 	} else {
2857 		err = log_scroll_down(view, page);
2858 		if (err)
2859 			return err;
2860 		if (first == s->first_displayed_entry && s->selected <
2861 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
2862 			s->selected = MIN(s->commits.ncommits - 1, page);
2863 		}
2864 	}
2865 	if (err)
2866 		return err;
2867 
2868 	/*
2869 	 * We might necessarily overshoot in horizontal
2870 	 * splits; if so, select the last displayed commit.
2871 	 */
2872 	s->selected = MIN(s->selected,
2873 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
2874 
2875 	select_commit(s);
2876 
2877 	if (s->thread_args.log_complete &&
2878 	    s->selected_entry->idx == s->commits.ncommits - 1)
2879 		view->count = 0;
2880 
2881 	return NULL;
2882 }
2883 
2884 /*
2885  * Get splitscreen dimensions based on TOG_VIEW_SPLIT_MODE:
2886  *    TOG_VIEW_SPLIT_VERT    vertical split if COLS > 119 (default)
2887  *    TOG_VIEW_SPLIT_HRZN    horizontal split
2888  * Assign start column and line of the new split to *x and *y, respectively,
2889  * and assign view mode to view->mode.
2890  */
2891 static void
2892 view_get_split(struct tog_view *view, int *y, int *x)
2893 {
2894 	char *mode;
2895 
2896 	*x = 0;
2897 	*y = 0;
2898 
2899 	mode = getenv("TOG_VIEW_SPLIT_MODE");
2900 
2901 	if (!mode || mode[0] != 'h') {
2902 		view->mode = TOG_VIEW_SPLIT_VERT;
2903 		*x = view_split_begin_x(view->begin_x);
2904 	} else if (mode && mode[0] == 'h') {
2905 		view->mode = TOG_VIEW_SPLIT_HRZN;
2906 		*y = view_split_begin_y(view->lines);
2907 	}
2908 }
2909 
2910 /* Split view horizontally at y and offset view->state->selected line. */
2911 static const struct got_error *
2912 view_init_hsplit(struct tog_view *view, int y)
2913 {
2914 	const struct got_error *err = NULL;
2915 
2916 	view->nlines = y;
2917 	err = view_resize(view);
2918 	if (err)
2919 		return err;
2920 
2921 	err = offset_selection_down(view);
2922 
2923 	return err;
2924 }
2925 
2926 static const struct got_error *
2927 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
2928 {
2929 	const struct got_error *err = NULL;
2930 	struct tog_log_view_state *s = &view->state.log;
2931 	struct tog_view *diff_view = NULL, *tree_view = NULL;
2932 	struct tog_view *ref_view = NULL;
2933 	struct commit_queue_entry *entry;
2934 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
2935 
2936 	if (s->thread_args.load_all) {
2937 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
2938 			s->thread_args.load_all = 0;
2939 		else if (s->thread_args.log_complete) {
2940 			err = log_move_cursor_down(view, s->commits.ncommits);
2941 			s->thread_args.load_all = 0;
2942 		}
2943 		return err;
2944 	}
2945 
2946 	eos = nscroll = view->nlines - 1;
2947 	if (view_is_hsplit_top(view))
2948 		--eos;  /* border */
2949 
2950 	switch (ch) {
2951 	case 'q':
2952 		s->quit = 1;
2953 		break;
2954 	case '0':
2955 		view->x = 0;
2956 		break;
2957 	case '$':
2958 		view->x = MAX(view->maxx - view->ncols / 2, 0);
2959 		view->count = 0;
2960 		break;
2961 	case KEY_RIGHT:
2962 	case 'l':
2963 		if (view->x + view->ncols / 2 < view->maxx)
2964 			view->x += 2;  /* move two columns right */
2965 		else
2966 			view->count = 0;
2967 		break;
2968 	case KEY_LEFT:
2969 	case 'h':
2970 		view->x -= MIN(view->x, 2);  /* move two columns back */
2971 		if (view->x <= 0)
2972 			view->count = 0;
2973 		break;
2974 	case 'k':
2975 	case KEY_UP:
2976 	case '<':
2977 	case ',':
2978 	case CTRL('p'):
2979 		log_move_cursor_up(view, 0, 0);
2980 		break;
2981 	case 'g':
2982 	case KEY_HOME:
2983 		log_move_cursor_up(view, 0, 1);
2984 		view->count = 0;
2985 		break;
2986 	case CTRL('u'):
2987 	case 'u':
2988 		nscroll /= 2;
2989 		/* FALL THROUGH */
2990 	case KEY_PPAGE:
2991 	case CTRL('b'):
2992 	case 'b':
2993 		log_move_cursor_up(view, nscroll, 0);
2994 		break;
2995 	case 'j':
2996 	case KEY_DOWN:
2997 	case '>':
2998 	case '.':
2999 	case CTRL('n'):
3000 		err = log_move_cursor_down(view, 0);
3001 		break;
3002 	case 'G':
3003 	case KEY_END: {
3004 		/* We don't know yet how many commits, so we're forced to
3005 		 * traverse them all. */
3006 		view->count = 0;
3007 		if (!s->thread_args.log_complete) {
3008 			s->thread_args.load_all = 1;
3009 			return trigger_log_thread(view, 0);
3010 		}
3011 
3012 		s->selected = 0;
3013 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3014 		for (n = 0; n < eos; n++) {
3015 			if (entry == NULL)
3016 				break;
3017 			s->first_displayed_entry = entry;
3018 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3019 		}
3020 		if (n > 0)
3021 			s->selected = n - 1;
3022 		select_commit(s);
3023 		break;
3024 	}
3025 	case CTRL('d'):
3026 	case 'd':
3027 		nscroll /= 2;
3028 		/* FALL THROUGH */
3029 	case KEY_NPAGE:
3030 	case CTRL('f'):
3031 	case 'f':
3032 	case ' ':
3033 		err = log_move_cursor_down(view, nscroll);
3034 		break;
3035 	case KEY_RESIZE:
3036 		if (s->selected > view->nlines - 2)
3037 			s->selected = view->nlines - 2;
3038 		if (s->selected > s->commits.ncommits - 1)
3039 			s->selected = s->commits.ncommits - 1;
3040 		select_commit(s);
3041 		if (s->commits.ncommits < view->nlines - 1 &&
3042 		    !s->thread_args.log_complete) {
3043 			s->thread_args.commits_needed += (view->nlines - 1) -
3044 			    s->commits.ncommits;
3045 			err = trigger_log_thread(view, 1);
3046 		}
3047 		break;
3048 	case KEY_ENTER:
3049 	case '\r':
3050 		view->count = 0;
3051 		if (s->selected_entry == NULL)
3052 			break;
3053 
3054 		/* get dimensions--don't split till initialisation succeeds */
3055 		if (view_is_parent_view(view))
3056 			view_get_split(view, &begin_y, &begin_x);
3057 
3058 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3059 		    s->selected_entry->commit, s->selected_entry->id,
3060 		    view, s->repo);
3061 		if (err)
3062 			break;
3063 
3064 		if (view_is_parent_view(view) &&
3065 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3066 			err = view_init_hsplit(view, begin_y);
3067 			if (err)
3068 				break;
3069 		}
3070 
3071 		view->focussed = 0;
3072 		diff_view->focussed = 1;
3073 		diff_view->mode = view->mode;
3074 		diff_view->nlines = view->lines - begin_y;
3075 
3076 		if (view_is_parent_view(view)) {
3077 			err = view_close_child(view);
3078 			if (err)
3079 				return err;
3080 			err = view_set_child(view, diff_view);
3081 			if (err)
3082 				return err;
3083 			view->focus_child = 1;
3084 		} else
3085 			*new_view = diff_view;
3086 		break;
3087 	case 't':
3088 		view->count = 0;
3089 		if (s->selected_entry == NULL)
3090 			break;
3091 		if (view_is_parent_view(view))
3092 			view_get_split(view, &begin_y, &begin_x);
3093 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3094 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3095 		    s->repo);
3096 		if (err)
3097 			break;
3098 		if (view_is_parent_view(view) &&
3099 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3100 			err = view_init_hsplit(view, begin_y);
3101 			if (err)
3102 				break;
3103 		}
3104 		view->focussed = 0;
3105 		tree_view->focussed = 1;
3106 		tree_view->mode = view->mode;
3107 		tree_view->nlines = view->lines - begin_y;
3108 		if (view_is_parent_view(view)) {
3109 			err = view_close_child(view);
3110 			if (err)
3111 				return err;
3112 			err = view_set_child(view, tree_view);
3113 			if (err)
3114 				return err;
3115 			view->focus_child = 1;
3116 		} else
3117 			*new_view = tree_view;
3118 		break;
3119 	case KEY_BACKSPACE:
3120 	case CTRL('l'):
3121 	case 'B':
3122 		view->count = 0;
3123 		if (ch == KEY_BACKSPACE &&
3124 		    got_path_is_root_dir(s->in_repo_path))
3125 			break;
3126 		err = stop_log_thread(s);
3127 		if (err)
3128 			return err;
3129 		if (ch == KEY_BACKSPACE) {
3130 			char *parent_path;
3131 			err = got_path_dirname(&parent_path, s->in_repo_path);
3132 			if (err)
3133 				return err;
3134 			free(s->in_repo_path);
3135 			s->in_repo_path = parent_path;
3136 			s->thread_args.in_repo_path = s->in_repo_path;
3137 		} else if (ch == CTRL('l')) {
3138 			struct got_object_id *start_id;
3139 			err = got_repo_match_object_id(&start_id, NULL,
3140 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3141 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3142 			if (err)
3143 				return err;
3144 			free(s->start_id);
3145 			s->start_id = start_id;
3146 			s->thread_args.start_id = s->start_id;
3147 		} else /* 'B' */
3148 			s->log_branches = !s->log_branches;
3149 
3150 		if (s->thread_args.pack_fds == NULL) {
3151 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3152 			if (err)
3153 				return err;
3154 		}
3155 		err = got_repo_open(&s->thread_args.repo,
3156 		    got_repo_get_path(s->repo), NULL,
3157 		    s->thread_args.pack_fds);
3158 		if (err)
3159 			return err;
3160 		tog_free_refs();
3161 		err = tog_load_refs(s->repo, 0);
3162 		if (err)
3163 			return err;
3164 		err = got_commit_graph_open(&s->thread_args.graph,
3165 		    s->in_repo_path, !s->log_branches);
3166 		if (err)
3167 			return err;
3168 		err = got_commit_graph_iter_start(s->thread_args.graph,
3169 		    s->start_id, s->repo, NULL, NULL);
3170 		if (err)
3171 			return err;
3172 		free_commits(&s->commits);
3173 		s->first_displayed_entry = NULL;
3174 		s->last_displayed_entry = NULL;
3175 		s->selected_entry = NULL;
3176 		s->selected = 0;
3177 		s->thread_args.log_complete = 0;
3178 		s->quit = 0;
3179 		s->thread_args.commits_needed = view->lines;
3180 		s->matched_entry = NULL;
3181 		s->search_entry = NULL;
3182 		break;
3183 	case 'r':
3184 		view->count = 0;
3185 		if (view_is_parent_view(view))
3186 			view_get_split(view, &begin_y, &begin_x);
3187 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3188 		if (ref_view == NULL)
3189 			return got_error_from_errno("view_open");
3190 		err = open_ref_view(ref_view, s->repo);
3191 		if (err) {
3192 			view_close(ref_view);
3193 			return err;
3194 		}
3195 		if (view_is_parent_view(view) &&
3196 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3197 			err = view_init_hsplit(view, begin_y);
3198 			if (err)
3199 				break;
3200 		}
3201 		view->focussed = 0;
3202 		ref_view->focussed = 1;
3203 		ref_view->mode = view->mode;
3204 		ref_view->nlines = view->lines - begin_y;
3205 		if (view_is_parent_view(view)) {
3206 			err = view_close_child(view);
3207 			if (err)
3208 				return err;
3209 			err = view_set_child(view, ref_view);
3210 			if (err)
3211 				return err;
3212 			view->focus_child = 1;
3213 		} else
3214 			*new_view = ref_view;
3215 		break;
3216 	default:
3217 		view->count = 0;
3218 		break;
3219 	}
3220 
3221 	return err;
3222 }
3223 
3224 static const struct got_error *
3225 apply_unveil(const char *repo_path, const char *worktree_path)
3226 {
3227 	const struct got_error *error;
3228 
3229 #ifdef PROFILE
3230 	if (unveil("gmon.out", "rwc") != 0)
3231 		return got_error_from_errno2("unveil", "gmon.out");
3232 #endif
3233 	if (repo_path && unveil(repo_path, "r") != 0)
3234 		return got_error_from_errno2("unveil", repo_path);
3235 
3236 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3237 		return got_error_from_errno2("unveil", worktree_path);
3238 
3239 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3240 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3241 
3242 	error = got_privsep_unveil_exec_helpers();
3243 	if (error != NULL)
3244 		return error;
3245 
3246 	if (unveil(NULL, NULL) != 0)
3247 		return got_error_from_errno("unveil");
3248 
3249 	return NULL;
3250 }
3251 
3252 static void
3253 init_curses(void)
3254 {
3255 	/*
3256 	 * Override default signal handlers before starting ncurses.
3257 	 * This should prevent ncurses from installing its own
3258 	 * broken cleanup() signal handler.
3259 	 */
3260 	signal(SIGWINCH, tog_sigwinch);
3261 	signal(SIGPIPE, tog_sigpipe);
3262 	signal(SIGCONT, tog_sigcont);
3263 	signal(SIGINT, tog_sigint);
3264 	signal(SIGTERM, tog_sigterm);
3265 
3266 	initscr();
3267 	cbreak();
3268 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3269 	noecho();
3270 	nonl();
3271 	intrflush(stdscr, FALSE);
3272 	keypad(stdscr, TRUE);
3273 	curs_set(0);
3274 	if (getenv("TOG_COLORS") != NULL) {
3275 		start_color();
3276 		use_default_colors();
3277 	}
3278 }
3279 
3280 static const struct got_error *
3281 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3282     struct got_repository *repo, struct got_worktree *worktree)
3283 {
3284 	const struct got_error *err = NULL;
3285 
3286 	if (argc == 0) {
3287 		*in_repo_path = strdup("/");
3288 		if (*in_repo_path == NULL)
3289 			return got_error_from_errno("strdup");
3290 		return NULL;
3291 	}
3292 
3293 	if (worktree) {
3294 		const char *prefix = got_worktree_get_path_prefix(worktree);
3295 		char *p;
3296 
3297 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3298 		if (err)
3299 			return err;
3300 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3301 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3302 		    p) == -1) {
3303 			err = got_error_from_errno("asprintf");
3304 			*in_repo_path = NULL;
3305 		}
3306 		free(p);
3307 	} else
3308 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3309 
3310 	return err;
3311 }
3312 
3313 static const struct got_error *
3314 cmd_log(int argc, char *argv[])
3315 {
3316 	const struct got_error *error;
3317 	struct got_repository *repo = NULL;
3318 	struct got_worktree *worktree = NULL;
3319 	struct got_object_id *start_id = NULL;
3320 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3321 	char *start_commit = NULL, *label = NULL;
3322 	struct got_reference *ref = NULL;
3323 	const char *head_ref_name = NULL;
3324 	int ch, log_branches = 0;
3325 	struct tog_view *view;
3326 	int *pack_fds = NULL;
3327 
3328 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3329 		switch (ch) {
3330 		case 'b':
3331 			log_branches = 1;
3332 			break;
3333 		case 'c':
3334 			start_commit = optarg;
3335 			break;
3336 		case 'r':
3337 			repo_path = realpath(optarg, NULL);
3338 			if (repo_path == NULL)
3339 				return got_error_from_errno2("realpath",
3340 				    optarg);
3341 			break;
3342 		default:
3343 			usage_log();
3344 			/* NOTREACHED */
3345 		}
3346 	}
3347 
3348 	argc -= optind;
3349 	argv += optind;
3350 
3351 	if (argc > 1)
3352 		usage_log();
3353 
3354 	error = got_repo_pack_fds_open(&pack_fds);
3355 	if (error != NULL)
3356 		goto done;
3357 
3358 	if (repo_path == NULL) {
3359 		cwd = getcwd(NULL, 0);
3360 		if (cwd == NULL)
3361 			return got_error_from_errno("getcwd");
3362 		error = got_worktree_open(&worktree, cwd);
3363 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3364 			goto done;
3365 		if (worktree)
3366 			repo_path =
3367 			    strdup(got_worktree_get_repo_path(worktree));
3368 		else
3369 			repo_path = strdup(cwd);
3370 		if (repo_path == NULL) {
3371 			error = got_error_from_errno("strdup");
3372 			goto done;
3373 		}
3374 	}
3375 
3376 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3377 	if (error != NULL)
3378 		goto done;
3379 
3380 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3381 	    repo, worktree);
3382 	if (error)
3383 		goto done;
3384 
3385 	init_curses();
3386 
3387 	error = apply_unveil(got_repo_get_path(repo),
3388 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3389 	if (error)
3390 		goto done;
3391 
3392 	/* already loaded by tog_log_with_path()? */
3393 	if (TAILQ_EMPTY(&tog_refs)) {
3394 		error = tog_load_refs(repo, 0);
3395 		if (error)
3396 			goto done;
3397 	}
3398 
3399 	if (start_commit == NULL) {
3400 		error = got_repo_match_object_id(&start_id, &label,
3401 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3402 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3403 		if (error)
3404 			goto done;
3405 		head_ref_name = label;
3406 	} else {
3407 		error = got_ref_open(&ref, repo, start_commit, 0);
3408 		if (error == NULL)
3409 			head_ref_name = got_ref_get_name(ref);
3410 		else if (error->code != GOT_ERR_NOT_REF)
3411 			goto done;
3412 		error = got_repo_match_object_id(&start_id, NULL,
3413 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3414 		if (error)
3415 			goto done;
3416 	}
3417 
3418 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3419 	if (view == NULL) {
3420 		error = got_error_from_errno("view_open");
3421 		goto done;
3422 	}
3423 	error = open_log_view(view, start_id, repo, head_ref_name,
3424 	    in_repo_path, log_branches);
3425 	if (error)
3426 		goto done;
3427 	if (worktree) {
3428 		/* Release work tree lock. */
3429 		got_worktree_close(worktree);
3430 		worktree = NULL;
3431 	}
3432 	error = view_loop(view);
3433 done:
3434 	free(in_repo_path);
3435 	free(repo_path);
3436 	free(cwd);
3437 	free(start_id);
3438 	free(label);
3439 	if (ref)
3440 		got_ref_close(ref);
3441 	if (repo) {
3442 		const struct got_error *close_err = got_repo_close(repo);
3443 		if (error == NULL)
3444 			error = close_err;
3445 	}
3446 	if (worktree)
3447 		got_worktree_close(worktree);
3448 	if (pack_fds) {
3449 		const struct got_error *pack_err =
3450 		    got_repo_pack_fds_close(pack_fds);
3451 		if (error == NULL)
3452 			error = pack_err;
3453 	}
3454 	tog_free_refs();
3455 	return error;
3456 }
3457 
3458 __dead static void
3459 usage_diff(void)
3460 {
3461 	endwin();
3462 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3463 	    "[-w] object1 object2\n", getprogname());
3464 	exit(1);
3465 }
3466 
3467 static int
3468 match_line(const char *line, regex_t *regex, size_t nmatch,
3469     regmatch_t *regmatch)
3470 {
3471 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3472 }
3473 
3474 static struct tog_color *
3475 match_color(struct tog_colors *colors, const char *line)
3476 {
3477 	struct tog_color *tc = NULL;
3478 
3479 	STAILQ_FOREACH(tc, colors, entry) {
3480 		if (match_line(line, &tc->regex, 0, NULL))
3481 			return tc;
3482 	}
3483 
3484 	return NULL;
3485 }
3486 
3487 static const struct got_error *
3488 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3489     WINDOW *window, int skipcol, regmatch_t *regmatch)
3490 {
3491 	const struct got_error *err = NULL;
3492 	char *exstr = NULL;
3493 	wchar_t *wline = NULL;
3494 	int rme, rms, n, width, scrollx;
3495 	int width0 = 0, width1 = 0, width2 = 0;
3496 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3497 
3498 	*wtotal = 0;
3499 
3500 	rms = regmatch->rm_so;
3501 	rme = regmatch->rm_eo;
3502 
3503 	err = expand_tab(&exstr, line);
3504 	if (err)
3505 		return err;
3506 
3507 	/* Split the line into 3 segments, according to match offsets. */
3508 	seg0 = strndup(exstr, rms);
3509 	if (seg0 == NULL) {
3510 		err = got_error_from_errno("strndup");
3511 		goto done;
3512 	}
3513 	seg1 = strndup(exstr + rms, rme - rms);
3514 	if (seg1 == NULL) {
3515 		err = got_error_from_errno("strndup");
3516 		goto done;
3517 	}
3518 	seg2 = strdup(exstr + rme);
3519 	if (seg2 == NULL) {
3520 		err = got_error_from_errno("strndup");
3521 		goto done;
3522 	}
3523 
3524 	/* draw up to matched token if we haven't scrolled past it */
3525 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3526 	    col_tab_align, 1);
3527 	if (err)
3528 		goto done;
3529 	n = MAX(width0 - skipcol, 0);
3530 	if (n) {
3531 		free(wline);
3532 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3533 		    wlimit, col_tab_align, 1);
3534 		if (err)
3535 			goto done;
3536 		waddwstr(window, &wline[scrollx]);
3537 		wlimit -= width;
3538 		*wtotal += width;
3539 	}
3540 
3541 	if (wlimit > 0) {
3542 		int i = 0, w = 0;
3543 		size_t wlen;
3544 
3545 		free(wline);
3546 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3547 		    col_tab_align, 1);
3548 		if (err)
3549 			goto done;
3550 		wlen = wcslen(wline);
3551 		while (i < wlen) {
3552 			width = wcwidth(wline[i]);
3553 			if (width == -1) {
3554 				/* should not happen, tabs are expanded */
3555 				err = got_error(GOT_ERR_RANGE);
3556 				goto done;
3557 			}
3558 			if (width0 + w + width > skipcol)
3559 				break;
3560 			w += width;
3561 			i++;
3562 		}
3563 		/* draw (visible part of) matched token (if scrolled into it) */
3564 		if (width1 - w > 0) {
3565 			wattron(window, A_STANDOUT);
3566 			waddwstr(window, &wline[i]);
3567 			wattroff(window, A_STANDOUT);
3568 			wlimit -= (width1 - w);
3569 			*wtotal += (width1 - w);
3570 		}
3571 	}
3572 
3573 	if (wlimit > 0) {  /* draw rest of line */
3574 		free(wline);
3575 		if (skipcol > width0 + width1) {
3576 			err = format_line(&wline, &width2, &scrollx, seg2,
3577 			    skipcol - (width0 + width1), wlimit,
3578 			    col_tab_align, 1);
3579 			if (err)
3580 				goto done;
3581 			waddwstr(window, &wline[scrollx]);
3582 		} else {
3583 			err = format_line(&wline, &width2, NULL, seg2, 0,
3584 			    wlimit, col_tab_align, 1);
3585 			if (err)
3586 				goto done;
3587 			waddwstr(window, wline);
3588 		}
3589 		*wtotal += width2;
3590 	}
3591 done:
3592 	free(wline);
3593 	free(exstr);
3594 	free(seg0);
3595 	free(seg1);
3596 	free(seg2);
3597 	return err;
3598 }
3599 
3600 static const struct got_error *
3601 draw_file(struct tog_view *view, const char *header)
3602 {
3603 	struct tog_diff_view_state *s = &view->state.diff;
3604 	regmatch_t *regmatch = &view->regmatch;
3605 	const struct got_error *err;
3606 	int nprinted = 0;
3607 	char *line;
3608 	size_t linesize = 0;
3609 	ssize_t linelen;
3610 	struct tog_color *tc;
3611 	wchar_t *wline;
3612 	int width;
3613 	int max_lines = view->nlines;
3614 	int nlines = s->nlines;
3615 	off_t line_offset;
3616 
3617 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3618 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3619 		return got_error_from_errno("fseek");
3620 
3621 	werase(view->window);
3622 
3623 	if (header) {
3624 		if (asprintf(&line, "[%d/%d] %s",
3625 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3626 		    header) == -1)
3627 			return got_error_from_errno("asprintf");
3628 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3629 		    0, 0);
3630 		free(line);
3631 		if (err)
3632 			return err;
3633 
3634 		if (view_needs_focus_indication(view))
3635 			wstandout(view->window);
3636 		waddwstr(view->window, wline);
3637 		free(wline);
3638 		wline = NULL;
3639 		if (view_needs_focus_indication(view))
3640 			wstandend(view->window);
3641 		if (width <= view->ncols - 1)
3642 			waddch(view->window, '\n');
3643 
3644 		if (max_lines <= 1)
3645 			return NULL;
3646 		max_lines--;
3647 	}
3648 
3649 	s->eof = 0;
3650 	view->maxx = 0;
3651 	line = NULL;
3652 	while (max_lines > 0 && nprinted < max_lines) {
3653 		linelen = getline(&line, &linesize, s->f);
3654 		if (linelen == -1) {
3655 			if (feof(s->f)) {
3656 				s->eof = 1;
3657 				break;
3658 			}
3659 			free(line);
3660 			return got_ferror(s->f, GOT_ERR_IO);
3661 		}
3662 
3663 		/* Set view->maxx based on full line length. */
3664 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3665 		    view->x ? 1 : 0);
3666 		if (err) {
3667 			free(line);
3668 			return err;
3669 		}
3670 		view->maxx = MAX(view->maxx, width);
3671 		free(wline);
3672 		wline = NULL;
3673 
3674 		tc = match_color(&s->colors, line);
3675 		if (tc)
3676 			wattr_on(view->window,
3677 			    COLOR_PAIR(tc->colorpair), NULL);
3678 		if (s->first_displayed_line + nprinted == s->matched_line &&
3679 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3680 			err = add_matched_line(&width, line, view->ncols, 0,
3681 			    view->window, view->x, regmatch);
3682 			if (err) {
3683 				free(line);
3684 				return err;
3685 			}
3686 		} else {
3687 			int skip;
3688 			err = format_line(&wline, &width, &skip, line,
3689 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3690 			if (err) {
3691 				free(line);
3692 				return err;
3693 			}
3694 			waddwstr(view->window, &wline[skip]);
3695 			free(wline);
3696 			wline = NULL;
3697 		}
3698 		if (tc)
3699 			wattr_off(view->window,
3700 			    COLOR_PAIR(tc->colorpair), NULL);
3701 		if (width <= view->ncols - 1)
3702 			waddch(view->window, '\n');
3703 		nprinted++;
3704 	}
3705 	free(line);
3706 	if (nprinted >= 1)
3707 		s->last_displayed_line = s->first_displayed_line +
3708 		    (nprinted - 1);
3709 	else
3710 		s->last_displayed_line = s->first_displayed_line;
3711 
3712 	view_border(view);
3713 
3714 	if (s->eof) {
3715 		while (nprinted < view->nlines) {
3716 			waddch(view->window, '\n');
3717 			nprinted++;
3718 		}
3719 
3720 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3721 		    view->ncols, 0, 0);
3722 		if (err) {
3723 			return err;
3724 		}
3725 
3726 		wstandout(view->window);
3727 		waddwstr(view->window, wline);
3728 		free(wline);
3729 		wline = NULL;
3730 		wstandend(view->window);
3731 	}
3732 
3733 	return NULL;
3734 }
3735 
3736 static char *
3737 get_datestr(time_t *time, char *datebuf)
3738 {
3739 	struct tm mytm, *tm;
3740 	char *p, *s;
3741 
3742 	tm = gmtime_r(time, &mytm);
3743 	if (tm == NULL)
3744 		return NULL;
3745 	s = asctime_r(tm, datebuf);
3746 	if (s == NULL)
3747 		return NULL;
3748 	p = strchr(s, '\n');
3749 	if (p)
3750 		*p = '\0';
3751 	return s;
3752 }
3753 
3754 static const struct got_error *
3755 get_changed_paths(struct got_pathlist_head *paths,
3756     struct got_commit_object *commit, struct got_repository *repo)
3757 {
3758 	const struct got_error *err = NULL;
3759 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
3760 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
3761 	struct got_object_qid *qid;
3762 
3763 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3764 	if (qid != NULL) {
3765 		struct got_commit_object *pcommit;
3766 		err = got_object_open_as_commit(&pcommit, repo,
3767 		    &qid->id);
3768 		if (err)
3769 			return err;
3770 
3771 		tree_id1 = got_object_id_dup(
3772 		    got_object_commit_get_tree_id(pcommit));
3773 		if (tree_id1 == NULL) {
3774 			got_object_commit_close(pcommit);
3775 			return got_error_from_errno("got_object_id_dup");
3776 		}
3777 		got_object_commit_close(pcommit);
3778 
3779 	}
3780 
3781 	if (tree_id1) {
3782 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
3783 		if (err)
3784 			goto done;
3785 	}
3786 
3787 	tree_id2 = got_object_commit_get_tree_id(commit);
3788 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
3789 	if (err)
3790 		goto done;
3791 
3792 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
3793 	    got_diff_tree_collect_changed_paths, paths, 0);
3794 done:
3795 	if (tree1)
3796 		got_object_tree_close(tree1);
3797 	if (tree2)
3798 		got_object_tree_close(tree2);
3799 	free(tree_id1);
3800 	return err;
3801 }
3802 
3803 static const struct got_error *
3804 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
3805 {
3806 	off_t *p;
3807 
3808 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
3809 	if (p == NULL)
3810 		return got_error_from_errno("reallocarray");
3811 	*line_offsets = p;
3812 	(*line_offsets)[*nlines] = off;
3813 	(*nlines)++;
3814 	return NULL;
3815 }
3816 
3817 static const struct got_error *
3818 write_commit_info(off_t **line_offsets, size_t *nlines,
3819     struct got_object_id *commit_id, struct got_reflist_head *refs,
3820     struct got_repository *repo, FILE *outfile)
3821 {
3822 	const struct got_error *err = NULL;
3823 	char datebuf[26], *datestr;
3824 	struct got_commit_object *commit;
3825 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
3826 	time_t committer_time;
3827 	const char *author, *committer;
3828 	char *refs_str = NULL;
3829 	struct got_pathlist_head changed_paths;
3830 	struct got_pathlist_entry *pe;
3831 	off_t outoff = 0;
3832 	int n;
3833 
3834 	TAILQ_INIT(&changed_paths);
3835 
3836 	if (refs) {
3837 		err = build_refs_str(&refs_str, refs, commit_id, repo);
3838 		if (err)
3839 			return err;
3840 	}
3841 
3842 	err = got_object_open_as_commit(&commit, repo, commit_id);
3843 	if (err)
3844 		return err;
3845 
3846 	err = got_object_id_str(&id_str, commit_id);
3847 	if (err) {
3848 		err = got_error_from_errno("got_object_id_str");
3849 		goto done;
3850 	}
3851 
3852 	err = add_line_offset(line_offsets, nlines, 0);
3853 	if (err)
3854 		goto done;
3855 
3856 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
3857 	    refs_str ? refs_str : "", refs_str ? ")" : "");
3858 	if (n < 0) {
3859 		err = got_error_from_errno("fprintf");
3860 		goto done;
3861 	}
3862 	outoff += n;
3863 	err = add_line_offset(line_offsets, nlines, outoff);
3864 	if (err)
3865 		goto done;
3866 
3867 	n = fprintf(outfile, "from: %s\n",
3868 	    got_object_commit_get_author(commit));
3869 	if (n < 0) {
3870 		err = got_error_from_errno("fprintf");
3871 		goto done;
3872 	}
3873 	outoff += n;
3874 	err = add_line_offset(line_offsets, nlines, outoff);
3875 	if (err)
3876 		goto done;
3877 
3878 	committer_time = got_object_commit_get_committer_time(commit);
3879 	datestr = get_datestr(&committer_time, datebuf);
3880 	if (datestr) {
3881 		n = fprintf(outfile, "date: %s UTC\n", datestr);
3882 		if (n < 0) {
3883 			err = got_error_from_errno("fprintf");
3884 			goto done;
3885 		}
3886 		outoff += n;
3887 		err = add_line_offset(line_offsets, nlines, outoff);
3888 		if (err)
3889 			goto done;
3890 	}
3891 	author = got_object_commit_get_author(commit);
3892 	committer = got_object_commit_get_committer(commit);
3893 	if (strcmp(author, committer) != 0) {
3894 		n = fprintf(outfile, "via: %s\n", committer);
3895 		if (n < 0) {
3896 			err = got_error_from_errno("fprintf");
3897 			goto done;
3898 		}
3899 		outoff += n;
3900 		err = add_line_offset(line_offsets, nlines, outoff);
3901 		if (err)
3902 			goto done;
3903 	}
3904 	if (got_object_commit_get_nparents(commit) > 1) {
3905 		const struct got_object_id_queue *parent_ids;
3906 		struct got_object_qid *qid;
3907 		int pn = 1;
3908 		parent_ids = got_object_commit_get_parent_ids(commit);
3909 		STAILQ_FOREACH(qid, parent_ids, entry) {
3910 			err = got_object_id_str(&id_str, &qid->id);
3911 			if (err)
3912 				goto done;
3913 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
3914 			if (n < 0) {
3915 				err = got_error_from_errno("fprintf");
3916 				goto done;
3917 			}
3918 			outoff += n;
3919 			err = add_line_offset(line_offsets, nlines, outoff);
3920 			if (err)
3921 				goto done;
3922 			free(id_str);
3923 			id_str = NULL;
3924 		}
3925 	}
3926 
3927 	err = got_object_commit_get_logmsg(&logmsg, commit);
3928 	if (err)
3929 		goto done;
3930 	s = logmsg;
3931 	while ((line = strsep(&s, "\n")) != NULL) {
3932 		n = fprintf(outfile, "%s\n", line);
3933 		if (n < 0) {
3934 			err = got_error_from_errno("fprintf");
3935 			goto done;
3936 		}
3937 		outoff += n;
3938 		err = add_line_offset(line_offsets, nlines, outoff);
3939 		if (err)
3940 			goto done;
3941 	}
3942 
3943 	err = get_changed_paths(&changed_paths, commit, repo);
3944 	if (err)
3945 		goto done;
3946 	TAILQ_FOREACH(pe, &changed_paths, entry) {
3947 		struct got_diff_changed_path *cp = pe->data;
3948 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
3949 		if (n < 0) {
3950 			err = got_error_from_errno("fprintf");
3951 			goto done;
3952 		}
3953 		outoff += n;
3954 		err = add_line_offset(line_offsets, nlines, outoff);
3955 		if (err)
3956 			goto done;
3957 		free((char *)pe->path);
3958 		free(pe->data);
3959 	}
3960 
3961 	fputc('\n', outfile);
3962 	outoff++;
3963 	err = add_line_offset(line_offsets, nlines, outoff);
3964 done:
3965 	got_pathlist_free(&changed_paths);
3966 	free(id_str);
3967 	free(logmsg);
3968 	free(refs_str);
3969 	got_object_commit_close(commit);
3970 	if (err) {
3971 		free(*line_offsets);
3972 		*line_offsets = NULL;
3973 		*nlines = 0;
3974 	}
3975 	return err;
3976 }
3977 
3978 static const struct got_error *
3979 create_diff(struct tog_diff_view_state *s)
3980 {
3981 	const struct got_error *err = NULL;
3982 	FILE *f = NULL;
3983 	int obj_type;
3984 
3985 	free(s->line_offsets);
3986 	s->line_offsets = malloc(sizeof(off_t));
3987 	if (s->line_offsets == NULL)
3988 		return got_error_from_errno("malloc");
3989 	s->nlines = 0;
3990 
3991 	f = got_opentemp();
3992 	if (f == NULL) {
3993 		err = got_error_from_errno("got_opentemp");
3994 		goto done;
3995 	}
3996 	if (s->f && fclose(s->f) == EOF) {
3997 		err = got_error_from_errno("fclose");
3998 		goto done;
3999 	}
4000 	s->f = f;
4001 
4002 	if (s->id1)
4003 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4004 	else
4005 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4006 	if (err)
4007 		goto done;
4008 
4009 	switch (obj_type) {
4010 	case GOT_OBJ_TYPE_BLOB:
4011 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4012 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4013 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4014 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4015 		break;
4016 	case GOT_OBJ_TYPE_TREE:
4017 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4018 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4019 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4020 		    s->force_text_diff, s->repo, s->f);
4021 		break;
4022 	case GOT_OBJ_TYPE_COMMIT: {
4023 		const struct got_object_id_queue *parent_ids;
4024 		struct got_object_qid *pid;
4025 		struct got_commit_object *commit2;
4026 		struct got_reflist_head *refs;
4027 
4028 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4029 		if (err)
4030 			goto done;
4031 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4032 		/* Show commit info if we're diffing to a parent/root commit. */
4033 		if (s->id1 == NULL) {
4034 			err = write_commit_info(&s->line_offsets, &s->nlines,
4035 			    s->id2, refs, s->repo, s->f);
4036 			if (err)
4037 				goto done;
4038 		} else {
4039 			parent_ids = got_object_commit_get_parent_ids(commit2);
4040 			STAILQ_FOREACH(pid, parent_ids, entry) {
4041 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4042 					err = write_commit_info(
4043 					    &s->line_offsets, &s->nlines,
4044 					    s->id2, refs, s->repo, s->f);
4045 					if (err)
4046 						goto done;
4047 					break;
4048 				}
4049 			}
4050 		}
4051 		got_object_commit_close(commit2);
4052 
4053 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4054 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4055 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4056 		    s->force_text_diff, s->repo, s->f);
4057 		break;
4058 	}
4059 	default:
4060 		err = got_error(GOT_ERR_OBJ_TYPE);
4061 		break;
4062 	}
4063 	if (err)
4064 		goto done;
4065 done:
4066 	if (s->f && fflush(s->f) != 0 && err == NULL)
4067 		err = got_error_from_errno("fflush");
4068 	return err;
4069 }
4070 
4071 static void
4072 diff_view_indicate_progress(struct tog_view *view)
4073 {
4074 	mvwaddstr(view->window, 0, 0, "diffing...");
4075 	update_panels();
4076 	doupdate();
4077 }
4078 
4079 static const struct got_error *
4080 search_start_diff_view(struct tog_view *view)
4081 {
4082 	struct tog_diff_view_state *s = &view->state.diff;
4083 
4084 	s->matched_line = 0;
4085 	return NULL;
4086 }
4087 
4088 static const struct got_error *
4089 search_next_diff_view(struct tog_view *view)
4090 {
4091 	struct tog_diff_view_state *s = &view->state.diff;
4092 	const struct got_error *err = NULL;
4093 	int lineno;
4094 	char *line = NULL;
4095 	size_t linesize = 0;
4096 	ssize_t linelen;
4097 
4098 	if (!view->searching) {
4099 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4100 		return NULL;
4101 	}
4102 
4103 	if (s->matched_line) {
4104 		if (view->searching == TOG_SEARCH_FORWARD)
4105 			lineno = s->matched_line + 1;
4106 		else
4107 			lineno = s->matched_line - 1;
4108 	} else
4109 		lineno = s->first_displayed_line;
4110 
4111 	while (1) {
4112 		off_t offset;
4113 
4114 		if (lineno <= 0 || lineno > s->nlines) {
4115 			if (s->matched_line == 0) {
4116 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4117 				break;
4118 			}
4119 
4120 			if (view->searching == TOG_SEARCH_FORWARD)
4121 				lineno = 1;
4122 			else
4123 				lineno = s->nlines;
4124 		}
4125 
4126 		offset = s->line_offsets[lineno - 1];
4127 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4128 			free(line);
4129 			return got_error_from_errno("fseeko");
4130 		}
4131 		linelen = getline(&line, &linesize, s->f);
4132 		if (linelen != -1) {
4133 			char *exstr;
4134 			err = expand_tab(&exstr, line);
4135 			if (err)
4136 				break;
4137 			if (match_line(exstr, &view->regex, 1,
4138 			    &view->regmatch)) {
4139 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4140 				s->matched_line = lineno;
4141 				free(exstr);
4142 				break;
4143 			}
4144 			free(exstr);
4145 		}
4146 		if (view->searching == TOG_SEARCH_FORWARD)
4147 			lineno++;
4148 		else
4149 			lineno--;
4150 	}
4151 	free(line);
4152 
4153 	if (s->matched_line) {
4154 		s->first_displayed_line = s->matched_line;
4155 		s->selected_line = 1;
4156 	}
4157 
4158 	return err;
4159 }
4160 
4161 static const struct got_error *
4162 close_diff_view(struct tog_view *view)
4163 {
4164 	const struct got_error *err = NULL;
4165 	struct tog_diff_view_state *s = &view->state.diff;
4166 
4167 	free(s->id1);
4168 	s->id1 = NULL;
4169 	free(s->id2);
4170 	s->id2 = NULL;
4171 	if (s->f && fclose(s->f) == EOF)
4172 		err = got_error_from_errno("fclose");
4173 	s->f = NULL;
4174 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4175 		err = got_error_from_errno("fclose");
4176 	s->f1 = NULL;
4177 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4178 		err = got_error_from_errno("fclose");
4179 	s->f2 = NULL;
4180 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4181 		err = got_error_from_errno("close");
4182 	s->fd1 = -1;
4183 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4184 		err = got_error_from_errno("close");
4185 	s->fd2 = -1;
4186 	free_colors(&s->colors);
4187 	free(s->line_offsets);
4188 	s->line_offsets = NULL;
4189 	s->nlines = 0;
4190 	return err;
4191 }
4192 
4193 static const struct got_error *
4194 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4195     struct got_object_id *id2, const char *label1, const char *label2,
4196     int diff_context, int ignore_whitespace, int force_text_diff,
4197     struct tog_view *log_view, struct got_repository *repo)
4198 {
4199 	const struct got_error *err;
4200 	struct tog_diff_view_state *s = &view->state.diff;
4201 
4202 	memset(s, 0, sizeof(*s));
4203 	s->fd1 = -1;
4204 	s->fd2 = -1;
4205 
4206 	if (id1 != NULL && id2 != NULL) {
4207 	    int type1, type2;
4208 	    err = got_object_get_type(&type1, repo, id1);
4209 	    if (err)
4210 		return err;
4211 	    err = got_object_get_type(&type2, repo, id2);
4212 	    if (err)
4213 		return err;
4214 
4215 	    if (type1 != type2)
4216 		return got_error(GOT_ERR_OBJ_TYPE);
4217 	}
4218 	s->first_displayed_line = 1;
4219 	s->last_displayed_line = view->nlines;
4220 	s->selected_line = 1;
4221 	s->repo = repo;
4222 	s->id1 = id1;
4223 	s->id2 = id2;
4224 	s->label1 = label1;
4225 	s->label2 = label2;
4226 
4227 	if (id1) {
4228 		s->id1 = got_object_id_dup(id1);
4229 		if (s->id1 == NULL)
4230 			return got_error_from_errno("got_object_id_dup");
4231 	} else
4232 		s->id1 = NULL;
4233 
4234 	s->id2 = got_object_id_dup(id2);
4235 	if (s->id2 == NULL) {
4236 		err = got_error_from_errno("got_object_id_dup");
4237 		goto done;
4238 	}
4239 
4240 	s->f1 = got_opentemp();
4241 	if (s->f1 == NULL) {
4242 		err = got_error_from_errno("got_opentemp");
4243 		goto done;
4244 	}
4245 
4246 	s->f2 = got_opentemp();
4247 	if (s->f2 == NULL) {
4248 		err = got_error_from_errno("got_opentemp");
4249 		goto done;
4250 	}
4251 
4252 	s->fd1 = got_opentempfd();
4253 	if (s->fd1 == -1) {
4254 		err = got_error_from_errno("got_opentempfd");
4255 		goto done;
4256 	}
4257 
4258 	s->fd2 = got_opentempfd();
4259 	if (s->fd2 == -1) {
4260 		err = got_error_from_errno("got_opentempfd");
4261 		goto done;
4262 	}
4263 
4264 	s->first_displayed_line = 1;
4265 	s->last_displayed_line = view->nlines;
4266 	s->diff_context = diff_context;
4267 	s->ignore_whitespace = ignore_whitespace;
4268 	s->force_text_diff = force_text_diff;
4269 	s->log_view = log_view;
4270 	s->repo = repo;
4271 
4272 	STAILQ_INIT(&s->colors);
4273 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4274 		err = add_color(&s->colors,
4275 		    "^-", TOG_COLOR_DIFF_MINUS,
4276 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4277 		if (err)
4278 			goto done;
4279 		err = add_color(&s->colors, "^\\+",
4280 		    TOG_COLOR_DIFF_PLUS,
4281 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4282 		if (err)
4283 			goto done;
4284 		err = add_color(&s->colors,
4285 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4286 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4287 		if (err)
4288 			goto done;
4289 
4290 		err = add_color(&s->colors,
4291 		    "^(commit [0-9a-f]|parent [0-9]|"
4292 		    "(blob|file|tree|commit) [-+] |"
4293 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4294 		    get_color_value("TOG_COLOR_DIFF_META"));
4295 		if (err)
4296 			goto done;
4297 
4298 		err = add_color(&s->colors,
4299 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4300 		    get_color_value("TOG_COLOR_AUTHOR"));
4301 		if (err)
4302 			goto done;
4303 
4304 		err = add_color(&s->colors,
4305 		    "^date: ", TOG_COLOR_DATE,
4306 		    get_color_value("TOG_COLOR_DATE"));
4307 		if (err)
4308 			goto done;
4309 	}
4310 
4311 	if (log_view && view_is_splitscreen(view))
4312 		show_log_view(log_view); /* draw vborder */
4313 	diff_view_indicate_progress(view);
4314 
4315 	err = create_diff(s);
4316 
4317 	view->show = show_diff_view;
4318 	view->input = input_diff_view;
4319 	view->reset = reset_diff_view;
4320 	view->close = close_diff_view;
4321 	view->search_start = search_start_diff_view;
4322 	view->search_next = search_next_diff_view;
4323 done:
4324 	if (err)
4325 		close_diff_view(view);
4326 	return err;
4327 }
4328 
4329 static const struct got_error *
4330 show_diff_view(struct tog_view *view)
4331 {
4332 	const struct got_error *err;
4333 	struct tog_diff_view_state *s = &view->state.diff;
4334 	char *id_str1 = NULL, *id_str2, *header;
4335 	const char *label1, *label2;
4336 
4337 	if (s->id1) {
4338 		err = got_object_id_str(&id_str1, s->id1);
4339 		if (err)
4340 			return err;
4341 		label1 = s->label1 ? : id_str1;
4342 	} else
4343 		label1 = "/dev/null";
4344 
4345 	err = got_object_id_str(&id_str2, s->id2);
4346 	if (err)
4347 		return err;
4348 	label2 = s->label2 ? : id_str2;
4349 
4350 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4351 		err = got_error_from_errno("asprintf");
4352 		free(id_str1);
4353 		free(id_str2);
4354 		return err;
4355 	}
4356 	free(id_str1);
4357 	free(id_str2);
4358 
4359 	err = draw_file(view, header);
4360 	free(header);
4361 	return err;
4362 }
4363 
4364 static const struct got_error *
4365 set_selected_commit(struct tog_diff_view_state *s,
4366     struct commit_queue_entry *entry)
4367 {
4368 	const struct got_error *err;
4369 	const struct got_object_id_queue *parent_ids;
4370 	struct got_commit_object *selected_commit;
4371 	struct got_object_qid *pid;
4372 
4373 	free(s->id2);
4374 	s->id2 = got_object_id_dup(entry->id);
4375 	if (s->id2 == NULL)
4376 		return got_error_from_errno("got_object_id_dup");
4377 
4378 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4379 	if (err)
4380 		return err;
4381 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4382 	free(s->id1);
4383 	pid = STAILQ_FIRST(parent_ids);
4384 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4385 	got_object_commit_close(selected_commit);
4386 	return NULL;
4387 }
4388 
4389 static const struct got_error *
4390 reset_diff_view(struct tog_view *view)
4391 {
4392 	struct tog_diff_view_state *s = &view->state.diff;
4393 
4394 	view->count = 0;
4395 	wclear(view->window);
4396 	s->first_displayed_line = 1;
4397 	s->last_displayed_line = view->nlines;
4398 	s->matched_line = 0;
4399 	diff_view_indicate_progress(view);
4400 	return create_diff(s);
4401 }
4402 
4403 static const struct got_error *
4404 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4405 {
4406 	const struct got_error *err = NULL;
4407 	struct tog_diff_view_state *s = &view->state.diff;
4408 	struct tog_log_view_state *ls;
4409 	struct commit_queue_entry *old_selected_entry;
4410 	char *line = NULL;
4411 	size_t linesize = 0;
4412 	ssize_t linelen;
4413 	int i, nscroll = view->nlines - 1;
4414 
4415 	switch (ch) {
4416 	case '0':
4417 		view->x = 0;
4418 		break;
4419 	case '$':
4420 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4421 		view->count = 0;
4422 		break;
4423 	case KEY_RIGHT:
4424 	case 'l':
4425 		if (view->x + view->ncols / 3 < view->maxx)
4426 			view->x += 2;  /* move two columns right */
4427 		else
4428 			view->count = 0;
4429 		break;
4430 	case KEY_LEFT:
4431 	case 'h':
4432 		view->x -= MIN(view->x, 2);  /* move two columns back */
4433 		if (view->x <= 0)
4434 			view->count = 0;
4435 		break;
4436 	case 'a':
4437 	case 'w':
4438 		if (ch == 'a')
4439 			s->force_text_diff = !s->force_text_diff;
4440 		if (ch == 'w')
4441 			s->ignore_whitespace = !s->ignore_whitespace;
4442 		err = reset_diff_view(view);
4443 		break;
4444 	case 'g':
4445 	case KEY_HOME:
4446 		s->first_displayed_line = 1;
4447 		view->count = 0;
4448 		break;
4449 	case 'G':
4450 	case KEY_END:
4451 		view->count = 0;
4452 		if (s->eof)
4453 			break;
4454 
4455 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4456 		s->eof = 1;
4457 		break;
4458 	case 'k':
4459 	case KEY_UP:
4460 	case CTRL('p'):
4461 		if (s->first_displayed_line > 1)
4462 			s->first_displayed_line--;
4463 		else
4464 			view->count = 0;
4465 		break;
4466 	case CTRL('u'):
4467 	case 'u':
4468 		nscroll /= 2;
4469 		/* FALL THROUGH */
4470 	case KEY_PPAGE:
4471 	case CTRL('b'):
4472 	case 'b':
4473 		if (s->first_displayed_line == 1) {
4474 			view->count = 0;
4475 			break;
4476 		}
4477 		i = 0;
4478 		while (i++ < nscroll && s->first_displayed_line > 1)
4479 			s->first_displayed_line--;
4480 		break;
4481 	case 'j':
4482 	case KEY_DOWN:
4483 	case CTRL('n'):
4484 		if (!s->eof)
4485 			s->first_displayed_line++;
4486 		else
4487 			view->count = 0;
4488 		break;
4489 	case CTRL('d'):
4490 	case 'd':
4491 		nscroll /= 2;
4492 		/* FALL THROUGH */
4493 	case KEY_NPAGE:
4494 	case CTRL('f'):
4495 	case 'f':
4496 	case ' ':
4497 		if (s->eof) {
4498 			view->count = 0;
4499 			break;
4500 		}
4501 		i = 0;
4502 		while (!s->eof && i++ < nscroll) {
4503 			linelen = getline(&line, &linesize, s->f);
4504 			s->first_displayed_line++;
4505 			if (linelen == -1) {
4506 				if (feof(s->f)) {
4507 					s->eof = 1;
4508 				} else
4509 					err = got_ferror(s->f, GOT_ERR_IO);
4510 				break;
4511 			}
4512 		}
4513 		free(line);
4514 		break;
4515 	case '[':
4516 		if (s->diff_context > 0) {
4517 			s->diff_context--;
4518 			s->matched_line = 0;
4519 			diff_view_indicate_progress(view);
4520 			err = create_diff(s);
4521 			if (s->first_displayed_line + view->nlines - 1 >
4522 			    s->nlines) {
4523 				s->first_displayed_line = 1;
4524 				s->last_displayed_line = view->nlines;
4525 			}
4526 		} else
4527 			view->count = 0;
4528 		break;
4529 	case ']':
4530 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4531 			s->diff_context++;
4532 			s->matched_line = 0;
4533 			diff_view_indicate_progress(view);
4534 			err = create_diff(s);
4535 		} else
4536 			view->count = 0;
4537 		break;
4538 	case '<':
4539 	case ',':
4540 		if (s->log_view == NULL) {
4541 			view->count = 0;
4542 			break;
4543 		}
4544 		ls = &s->log_view->state.log;
4545 		old_selected_entry = ls->selected_entry;
4546 
4547 		/* view->count handled in input_log_view() */
4548 		err = input_log_view(NULL, s->log_view, KEY_UP);
4549 		if (err)
4550 			break;
4551 
4552 		if (old_selected_entry == ls->selected_entry)
4553 			break;
4554 
4555 		err = set_selected_commit(s, ls->selected_entry);
4556 		if (err)
4557 			break;
4558 
4559 		s->first_displayed_line = 1;
4560 		s->last_displayed_line = view->nlines;
4561 		s->matched_line = 0;
4562 		view->x = 0;
4563 
4564 		diff_view_indicate_progress(view);
4565 		err = create_diff(s);
4566 		break;
4567 	case '>':
4568 	case '.':
4569 		if (s->log_view == NULL) {
4570 			view->count = 0;
4571 			break;
4572 		}
4573 		ls = &s->log_view->state.log;
4574 		old_selected_entry = ls->selected_entry;
4575 
4576 		/* view->count handled in input_log_view() */
4577 		err = input_log_view(NULL, s->log_view, KEY_DOWN);
4578 		if (err)
4579 			break;
4580 
4581 		if (old_selected_entry == ls->selected_entry)
4582 			break;
4583 
4584 		err = set_selected_commit(s, ls->selected_entry);
4585 		if (err)
4586 			break;
4587 
4588 		s->first_displayed_line = 1;
4589 		s->last_displayed_line = view->nlines;
4590 		s->matched_line = 0;
4591 		view->x = 0;
4592 
4593 		diff_view_indicate_progress(view);
4594 		err = create_diff(s);
4595 		break;
4596 	default:
4597 		view->count = 0;
4598 		break;
4599 	}
4600 
4601 	return err;
4602 }
4603 
4604 static const struct got_error *
4605 cmd_diff(int argc, char *argv[])
4606 {
4607 	const struct got_error *error = NULL;
4608 	struct got_repository *repo = NULL;
4609 	struct got_worktree *worktree = NULL;
4610 	struct got_object_id *id1 = NULL, *id2 = NULL;
4611 	char *repo_path = NULL, *cwd = NULL;
4612 	char *id_str1 = NULL, *id_str2 = NULL;
4613 	char *label1 = NULL, *label2 = NULL;
4614 	int diff_context = 3, ignore_whitespace = 0;
4615 	int ch, force_text_diff = 0;
4616 	const char *errstr;
4617 	struct tog_view *view;
4618 	int *pack_fds = NULL;
4619 
4620 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4621 		switch (ch) {
4622 		case 'a':
4623 			force_text_diff = 1;
4624 			break;
4625 		case 'C':
4626 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4627 			    &errstr);
4628 			if (errstr != NULL)
4629 				errx(1, "number of context lines is %s: %s",
4630 				    errstr, errstr);
4631 			break;
4632 		case 'r':
4633 			repo_path = realpath(optarg, NULL);
4634 			if (repo_path == NULL)
4635 				return got_error_from_errno2("realpath",
4636 				    optarg);
4637 			got_path_strip_trailing_slashes(repo_path);
4638 			break;
4639 		case 'w':
4640 			ignore_whitespace = 1;
4641 			break;
4642 		default:
4643 			usage_diff();
4644 			/* NOTREACHED */
4645 		}
4646 	}
4647 
4648 	argc -= optind;
4649 	argv += optind;
4650 
4651 	if (argc == 0) {
4652 		usage_diff(); /* TODO show local worktree changes */
4653 	} else if (argc == 2) {
4654 		id_str1 = argv[0];
4655 		id_str2 = argv[1];
4656 	} else
4657 		usage_diff();
4658 
4659 	error = got_repo_pack_fds_open(&pack_fds);
4660 	if (error)
4661 		goto done;
4662 
4663 	if (repo_path == NULL) {
4664 		cwd = getcwd(NULL, 0);
4665 		if (cwd == NULL)
4666 			return got_error_from_errno("getcwd");
4667 		error = got_worktree_open(&worktree, cwd);
4668 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4669 			goto done;
4670 		if (worktree)
4671 			repo_path =
4672 			    strdup(got_worktree_get_repo_path(worktree));
4673 		else
4674 			repo_path = strdup(cwd);
4675 		if (repo_path == NULL) {
4676 			error = got_error_from_errno("strdup");
4677 			goto done;
4678 		}
4679 	}
4680 
4681 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4682 	if (error)
4683 		goto done;
4684 
4685 	init_curses();
4686 
4687 	error = apply_unveil(got_repo_get_path(repo), NULL);
4688 	if (error)
4689 		goto done;
4690 
4691 	error = tog_load_refs(repo, 0);
4692 	if (error)
4693 		goto done;
4694 
4695 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4696 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4697 	if (error)
4698 		goto done;
4699 
4700 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4701 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4702 	if (error)
4703 		goto done;
4704 
4705 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4706 	if (view == NULL) {
4707 		error = got_error_from_errno("view_open");
4708 		goto done;
4709 	}
4710 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4711 	    ignore_whitespace, force_text_diff, NULL,  repo);
4712 	if (error)
4713 		goto done;
4714 	error = view_loop(view);
4715 done:
4716 	free(label1);
4717 	free(label2);
4718 	free(repo_path);
4719 	free(cwd);
4720 	if (repo) {
4721 		const struct got_error *close_err = got_repo_close(repo);
4722 		if (error == NULL)
4723 			error = close_err;
4724 	}
4725 	if (worktree)
4726 		got_worktree_close(worktree);
4727 	if (pack_fds) {
4728 		const struct got_error *pack_err =
4729 		    got_repo_pack_fds_close(pack_fds);
4730 		if (error == NULL)
4731 			error = pack_err;
4732 	}
4733 	tog_free_refs();
4734 	return error;
4735 }
4736 
4737 __dead static void
4738 usage_blame(void)
4739 {
4740 	endwin();
4741 	fprintf(stderr,
4742 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
4743 	    getprogname());
4744 	exit(1);
4745 }
4746 
4747 struct tog_blame_line {
4748 	int annotated;
4749 	struct got_object_id *id;
4750 };
4751 
4752 static const struct got_error *
4753 draw_blame(struct tog_view *view)
4754 {
4755 	struct tog_blame_view_state *s = &view->state.blame;
4756 	struct tog_blame *blame = &s->blame;
4757 	regmatch_t *regmatch = &view->regmatch;
4758 	const struct got_error *err;
4759 	int lineno = 0, nprinted = 0;
4760 	char *line = NULL;
4761 	size_t linesize = 0;
4762 	ssize_t linelen;
4763 	wchar_t *wline;
4764 	int width;
4765 	struct tog_blame_line *blame_line;
4766 	struct got_object_id *prev_id = NULL;
4767 	char *id_str;
4768 	struct tog_color *tc;
4769 
4770 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
4771 	if (err)
4772 		return err;
4773 
4774 	rewind(blame->f);
4775 	werase(view->window);
4776 
4777 	if (asprintf(&line, "commit %s", id_str) == -1) {
4778 		err = got_error_from_errno("asprintf");
4779 		free(id_str);
4780 		return err;
4781 	}
4782 
4783 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4784 	free(line);
4785 	line = NULL;
4786 	if (err)
4787 		return err;
4788 	if (view_needs_focus_indication(view))
4789 		wstandout(view->window);
4790 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4791 	if (tc)
4792 		wattr_on(view->window,
4793 		    COLOR_PAIR(tc->colorpair), NULL);
4794 	waddwstr(view->window, wline);
4795 	if (tc)
4796 		wattr_off(view->window,
4797 		    COLOR_PAIR(tc->colorpair), NULL);
4798 	if (view_needs_focus_indication(view))
4799 		wstandend(view->window);
4800 	free(wline);
4801 	wline = NULL;
4802 	if (width < view->ncols - 1)
4803 		waddch(view->window, '\n');
4804 
4805 	if (asprintf(&line, "[%d/%d] %s%s",
4806 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
4807 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
4808 		free(id_str);
4809 		return got_error_from_errno("asprintf");
4810 	}
4811 	free(id_str);
4812 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4813 	free(line);
4814 	line = NULL;
4815 	if (err)
4816 		return err;
4817 	waddwstr(view->window, wline);
4818 	free(wline);
4819 	wline = NULL;
4820 	if (width < view->ncols - 1)
4821 		waddch(view->window, '\n');
4822 
4823 	s->eof = 0;
4824 	view->maxx = 0;
4825 	while (nprinted < view->nlines - 2) {
4826 		linelen = getline(&line, &linesize, blame->f);
4827 		if (linelen == -1) {
4828 			if (feof(blame->f)) {
4829 				s->eof = 1;
4830 				break;
4831 			}
4832 			free(line);
4833 			return got_ferror(blame->f, GOT_ERR_IO);
4834 		}
4835 		if (++lineno < s->first_displayed_line)
4836 			continue;
4837 
4838 		/* Set view->maxx based on full line length. */
4839 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
4840 		if (err) {
4841 			free(line);
4842 			return err;
4843 		}
4844 		free(wline);
4845 		wline = NULL;
4846 		view->maxx = MAX(view->maxx, width);
4847 
4848 		if (view->focussed && nprinted == s->selected_line - 1)
4849 			wstandout(view->window);
4850 
4851 		if (blame->nlines > 0) {
4852 			blame_line = &blame->lines[lineno - 1];
4853 			if (blame_line->annotated && prev_id &&
4854 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
4855 			    !(view->focussed &&
4856 			    nprinted == s->selected_line - 1)) {
4857 				waddstr(view->window, "        ");
4858 			} else if (blame_line->annotated) {
4859 				char *id_str;
4860 				err = got_object_id_str(&id_str,
4861 				    blame_line->id);
4862 				if (err) {
4863 					free(line);
4864 					return err;
4865 				}
4866 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4867 				if (tc)
4868 					wattr_on(view->window,
4869 					    COLOR_PAIR(tc->colorpair), NULL);
4870 				wprintw(view->window, "%.8s", id_str);
4871 				if (tc)
4872 					wattr_off(view->window,
4873 					    COLOR_PAIR(tc->colorpair), NULL);
4874 				free(id_str);
4875 				prev_id = blame_line->id;
4876 			} else {
4877 				waddstr(view->window, "........");
4878 				prev_id = NULL;
4879 			}
4880 		} else {
4881 			waddstr(view->window, "........");
4882 			prev_id = NULL;
4883 		}
4884 
4885 		if (view->focussed && nprinted == s->selected_line - 1)
4886 			wstandend(view->window);
4887 		waddstr(view->window, " ");
4888 
4889 		if (view->ncols <= 9) {
4890 			width = 9;
4891 		} else if (s->first_displayed_line + nprinted ==
4892 		    s->matched_line &&
4893 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4894 			err = add_matched_line(&width, line, view->ncols - 9, 9,
4895 			    view->window, view->x, regmatch);
4896 			if (err) {
4897 				free(line);
4898 				return err;
4899 			}
4900 			width += 9;
4901 		} else {
4902 			int skip;
4903 			err = format_line(&wline, &width, &skip, line,
4904 			    view->x, view->ncols - 9, 9, 1);
4905 			if (err) {
4906 				free(line);
4907 				return err;
4908 			}
4909 			waddwstr(view->window, &wline[skip]);
4910 			width += 9;
4911 			free(wline);
4912 			wline = NULL;
4913 		}
4914 
4915 		if (width <= view->ncols - 1)
4916 			waddch(view->window, '\n');
4917 		if (++nprinted == 1)
4918 			s->first_displayed_line = lineno;
4919 	}
4920 	free(line);
4921 	s->last_displayed_line = lineno;
4922 
4923 	view_border(view);
4924 
4925 	return NULL;
4926 }
4927 
4928 static const struct got_error *
4929 blame_cb(void *arg, int nlines, int lineno,
4930     struct got_commit_object *commit, struct got_object_id *id)
4931 {
4932 	const struct got_error *err = NULL;
4933 	struct tog_blame_cb_args *a = arg;
4934 	struct tog_blame_line *line;
4935 	int errcode;
4936 
4937 	if (nlines != a->nlines ||
4938 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
4939 		return got_error(GOT_ERR_RANGE);
4940 
4941 	errcode = pthread_mutex_lock(&tog_mutex);
4942 	if (errcode)
4943 		return got_error_set_errno(errcode, "pthread_mutex_lock");
4944 
4945 	if (*a->quit) {	/* user has quit the blame view */
4946 		err = got_error(GOT_ERR_ITER_COMPLETED);
4947 		goto done;
4948 	}
4949 
4950 	if (lineno == -1)
4951 		goto done; /* no change in this commit */
4952 
4953 	line = &a->lines[lineno - 1];
4954 	if (line->annotated)
4955 		goto done;
4956 
4957 	line->id = got_object_id_dup(id);
4958 	if (line->id == NULL) {
4959 		err = got_error_from_errno("got_object_id_dup");
4960 		goto done;
4961 	}
4962 	line->annotated = 1;
4963 done:
4964 	errcode = pthread_mutex_unlock(&tog_mutex);
4965 	if (errcode)
4966 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4967 	return err;
4968 }
4969 
4970 static void *
4971 blame_thread(void *arg)
4972 {
4973 	const struct got_error *err, *close_err;
4974 	struct tog_blame_thread_args *ta = arg;
4975 	struct tog_blame_cb_args *a = ta->cb_args;
4976 	int errcode, fd1 = -1, fd2 = -1;
4977 	FILE *f1 = NULL, *f2 = NULL;
4978 
4979 	fd1 = got_opentempfd();
4980 	if (fd1 == -1)
4981 		return (void *)got_error_from_errno("got_opentempfd");
4982 
4983 	fd2 = got_opentempfd();
4984 	if (fd2 == -1) {
4985 		err = got_error_from_errno("got_opentempfd");
4986 		goto done;
4987 	}
4988 
4989 	f1 = got_opentemp();
4990 	if (f1 == NULL) {
4991 		err = (void *)got_error_from_errno("got_opentemp");
4992 		goto done;
4993 	}
4994 	f2 = got_opentemp();
4995 	if (f2 == NULL) {
4996 		err = (void *)got_error_from_errno("got_opentemp");
4997 		goto done;
4998 	}
4999 
5000 	err = block_signals_used_by_main_thread();
5001 	if (err)
5002 		goto done;
5003 
5004 	err = got_blame(ta->path, a->commit_id, ta->repo,
5005 	    tog_diff_algo, blame_cb, ta->cb_args,
5006 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5007 	if (err && err->code == GOT_ERR_CANCELLED)
5008 		err = NULL;
5009 
5010 	errcode = pthread_mutex_lock(&tog_mutex);
5011 	if (errcode) {
5012 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5013 		goto done;
5014 	}
5015 
5016 	close_err = got_repo_close(ta->repo);
5017 	if (err == NULL)
5018 		err = close_err;
5019 	ta->repo = NULL;
5020 	*ta->complete = 1;
5021 
5022 	errcode = pthread_mutex_unlock(&tog_mutex);
5023 	if (errcode && err == NULL)
5024 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5025 
5026 done:
5027 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5028 		err = got_error_from_errno("close");
5029 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5030 		err = got_error_from_errno("close");
5031 	if (f1 && fclose(f1) == EOF && err == NULL)
5032 		err = got_error_from_errno("fclose");
5033 	if (f2 && fclose(f2) == EOF && err == NULL)
5034 		err = got_error_from_errno("fclose");
5035 
5036 	return (void *)err;
5037 }
5038 
5039 static struct got_object_id *
5040 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5041     int first_displayed_line, int selected_line)
5042 {
5043 	struct tog_blame_line *line;
5044 
5045 	if (nlines <= 0)
5046 		return NULL;
5047 
5048 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5049 	if (!line->annotated)
5050 		return NULL;
5051 
5052 	return line->id;
5053 }
5054 
5055 static const struct got_error *
5056 stop_blame(struct tog_blame *blame)
5057 {
5058 	const struct got_error *err = NULL;
5059 	int i;
5060 
5061 	if (blame->thread) {
5062 		int errcode;
5063 		errcode = pthread_mutex_unlock(&tog_mutex);
5064 		if (errcode)
5065 			return got_error_set_errno(errcode,
5066 			    "pthread_mutex_unlock");
5067 		errcode = pthread_join(blame->thread, (void **)&err);
5068 		if (errcode)
5069 			return got_error_set_errno(errcode, "pthread_join");
5070 		errcode = pthread_mutex_lock(&tog_mutex);
5071 		if (errcode)
5072 			return got_error_set_errno(errcode,
5073 			    "pthread_mutex_lock");
5074 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5075 			err = NULL;
5076 		blame->thread = NULL;
5077 	}
5078 	if (blame->thread_args.repo) {
5079 		const struct got_error *close_err;
5080 		close_err = got_repo_close(blame->thread_args.repo);
5081 		if (err == NULL)
5082 			err = close_err;
5083 		blame->thread_args.repo = NULL;
5084 	}
5085 	if (blame->f) {
5086 		if (fclose(blame->f) == EOF && err == NULL)
5087 			err = got_error_from_errno("fclose");
5088 		blame->f = NULL;
5089 	}
5090 	if (blame->lines) {
5091 		for (i = 0; i < blame->nlines; i++)
5092 			free(blame->lines[i].id);
5093 		free(blame->lines);
5094 		blame->lines = NULL;
5095 	}
5096 	free(blame->cb_args.commit_id);
5097 	blame->cb_args.commit_id = NULL;
5098 	if (blame->pack_fds) {
5099 		const struct got_error *pack_err =
5100 		    got_repo_pack_fds_close(blame->pack_fds);
5101 		if (err == NULL)
5102 			err = pack_err;
5103 		blame->pack_fds = NULL;
5104 	}
5105 	return err;
5106 }
5107 
5108 static const struct got_error *
5109 cancel_blame_view(void *arg)
5110 {
5111 	const struct got_error *err = NULL;
5112 	int *done = arg;
5113 	int errcode;
5114 
5115 	errcode = pthread_mutex_lock(&tog_mutex);
5116 	if (errcode)
5117 		return got_error_set_errno(errcode,
5118 		    "pthread_mutex_unlock");
5119 
5120 	if (*done)
5121 		err = got_error(GOT_ERR_CANCELLED);
5122 
5123 	errcode = pthread_mutex_unlock(&tog_mutex);
5124 	if (errcode)
5125 		return got_error_set_errno(errcode,
5126 		    "pthread_mutex_lock");
5127 
5128 	return err;
5129 }
5130 
5131 static const struct got_error *
5132 run_blame(struct tog_view *view)
5133 {
5134 	struct tog_blame_view_state *s = &view->state.blame;
5135 	struct tog_blame *blame = &s->blame;
5136 	const struct got_error *err = NULL;
5137 	struct got_commit_object *commit = NULL;
5138 	struct got_blob_object *blob = NULL;
5139 	struct got_repository *thread_repo = NULL;
5140 	struct got_object_id *obj_id = NULL;
5141 	int obj_type, fd = -1;
5142 	int *pack_fds = NULL;
5143 
5144 	err = got_object_open_as_commit(&commit, s->repo,
5145 	    &s->blamed_commit->id);
5146 	if (err)
5147 		return err;
5148 
5149 	fd = got_opentempfd();
5150 	if (fd == -1) {
5151 		err = got_error_from_errno("got_opentempfd");
5152 		goto done;
5153 	}
5154 
5155 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5156 	if (err)
5157 		goto done;
5158 
5159 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5160 	if (err)
5161 		goto done;
5162 
5163 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5164 		err = got_error(GOT_ERR_OBJ_TYPE);
5165 		goto done;
5166 	}
5167 
5168 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5169 	if (err)
5170 		goto done;
5171 	blame->f = got_opentemp();
5172 	if (blame->f == NULL) {
5173 		err = got_error_from_errno("got_opentemp");
5174 		goto done;
5175 	}
5176 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5177 	    &blame->line_offsets, blame->f, blob);
5178 	if (err)
5179 		goto done;
5180 	if (blame->nlines == 0) {
5181 		s->blame_complete = 1;
5182 		goto done;
5183 	}
5184 
5185 	/* Don't include \n at EOF in the blame line count. */
5186 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5187 		blame->nlines--;
5188 
5189 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5190 	if (blame->lines == NULL) {
5191 		err = got_error_from_errno("calloc");
5192 		goto done;
5193 	}
5194 
5195 	err = got_repo_pack_fds_open(&pack_fds);
5196 	if (err)
5197 		goto done;
5198 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5199 	    pack_fds);
5200 	if (err)
5201 		goto done;
5202 
5203 	blame->pack_fds = pack_fds;
5204 	blame->cb_args.view = view;
5205 	blame->cb_args.lines = blame->lines;
5206 	blame->cb_args.nlines = blame->nlines;
5207 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5208 	if (blame->cb_args.commit_id == NULL) {
5209 		err = got_error_from_errno("got_object_id_dup");
5210 		goto done;
5211 	}
5212 	blame->cb_args.quit = &s->done;
5213 
5214 	blame->thread_args.path = s->path;
5215 	blame->thread_args.repo = thread_repo;
5216 	blame->thread_args.cb_args = &blame->cb_args;
5217 	blame->thread_args.complete = &s->blame_complete;
5218 	blame->thread_args.cancel_cb = cancel_blame_view;
5219 	blame->thread_args.cancel_arg = &s->done;
5220 	s->blame_complete = 0;
5221 
5222 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5223 		s->first_displayed_line = 1;
5224 		s->last_displayed_line = view->nlines;
5225 		s->selected_line = 1;
5226 	}
5227 	s->matched_line = 0;
5228 
5229 done:
5230 	if (commit)
5231 		got_object_commit_close(commit);
5232 	if (fd != -1 && close(fd) == -1 && err == NULL)
5233 		err = got_error_from_errno("close");
5234 	if (blob)
5235 		got_object_blob_close(blob);
5236 	free(obj_id);
5237 	if (err)
5238 		stop_blame(blame);
5239 	return err;
5240 }
5241 
5242 static const struct got_error *
5243 open_blame_view(struct tog_view *view, char *path,
5244     struct got_object_id *commit_id, struct got_repository *repo)
5245 {
5246 	const struct got_error *err = NULL;
5247 	struct tog_blame_view_state *s = &view->state.blame;
5248 
5249 	STAILQ_INIT(&s->blamed_commits);
5250 
5251 	s->path = strdup(path);
5252 	if (s->path == NULL)
5253 		return got_error_from_errno("strdup");
5254 
5255 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5256 	if (err) {
5257 		free(s->path);
5258 		return err;
5259 	}
5260 
5261 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5262 	s->first_displayed_line = 1;
5263 	s->last_displayed_line = view->nlines;
5264 	s->selected_line = 1;
5265 	s->blame_complete = 0;
5266 	s->repo = repo;
5267 	s->commit_id = commit_id;
5268 	memset(&s->blame, 0, sizeof(s->blame));
5269 
5270 	STAILQ_INIT(&s->colors);
5271 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5272 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5273 		    get_color_value("TOG_COLOR_COMMIT"));
5274 		if (err)
5275 			return err;
5276 	}
5277 
5278 	view->show = show_blame_view;
5279 	view->input = input_blame_view;
5280 	view->reset = reset_blame_view;
5281 	view->close = close_blame_view;
5282 	view->search_start = search_start_blame_view;
5283 	view->search_next = search_next_blame_view;
5284 
5285 	return run_blame(view);
5286 }
5287 
5288 static const struct got_error *
5289 close_blame_view(struct tog_view *view)
5290 {
5291 	const struct got_error *err = NULL;
5292 	struct tog_blame_view_state *s = &view->state.blame;
5293 
5294 	if (s->blame.thread)
5295 		err = stop_blame(&s->blame);
5296 
5297 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5298 		struct got_object_qid *blamed_commit;
5299 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5300 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5301 		got_object_qid_free(blamed_commit);
5302 	}
5303 
5304 	free(s->path);
5305 	free_colors(&s->colors);
5306 	return err;
5307 }
5308 
5309 static const struct got_error *
5310 search_start_blame_view(struct tog_view *view)
5311 {
5312 	struct tog_blame_view_state *s = &view->state.blame;
5313 
5314 	s->matched_line = 0;
5315 	return NULL;
5316 }
5317 
5318 static const struct got_error *
5319 search_next_blame_view(struct tog_view *view)
5320 {
5321 	struct tog_blame_view_state *s = &view->state.blame;
5322 	const struct got_error *err = NULL;
5323 	int lineno;
5324 	char *line = NULL;
5325 	size_t linesize = 0;
5326 	ssize_t linelen;
5327 
5328 	if (!view->searching) {
5329 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5330 		return NULL;
5331 	}
5332 
5333 	if (s->matched_line) {
5334 		if (view->searching == TOG_SEARCH_FORWARD)
5335 			lineno = s->matched_line + 1;
5336 		else
5337 			lineno = s->matched_line - 1;
5338 	} else
5339 		lineno = s->first_displayed_line - 1 + s->selected_line;
5340 
5341 	while (1) {
5342 		off_t offset;
5343 
5344 		if (lineno <= 0 || lineno > s->blame.nlines) {
5345 			if (s->matched_line == 0) {
5346 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5347 				break;
5348 			}
5349 
5350 			if (view->searching == TOG_SEARCH_FORWARD)
5351 				lineno = 1;
5352 			else
5353 				lineno = s->blame.nlines;
5354 		}
5355 
5356 		offset = s->blame.line_offsets[lineno - 1];
5357 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5358 			free(line);
5359 			return got_error_from_errno("fseeko");
5360 		}
5361 		linelen = getline(&line, &linesize, s->blame.f);
5362 		if (linelen != -1) {
5363 			char *exstr;
5364 			err = expand_tab(&exstr, line);
5365 			if (err)
5366 				break;
5367 			if (match_line(exstr, &view->regex, 1,
5368 			    &view->regmatch)) {
5369 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5370 				s->matched_line = lineno;
5371 				free(exstr);
5372 				break;
5373 			}
5374 			free(exstr);
5375 		}
5376 		if (view->searching == TOG_SEARCH_FORWARD)
5377 			lineno++;
5378 		else
5379 			lineno--;
5380 	}
5381 	free(line);
5382 
5383 	if (s->matched_line) {
5384 		s->first_displayed_line = s->matched_line;
5385 		s->selected_line = 1;
5386 	}
5387 
5388 	return err;
5389 }
5390 
5391 static const struct got_error *
5392 show_blame_view(struct tog_view *view)
5393 {
5394 	const struct got_error *err = NULL;
5395 	struct tog_blame_view_state *s = &view->state.blame;
5396 	int errcode;
5397 
5398 	if (s->blame.thread == NULL && !s->blame_complete) {
5399 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5400 		    &s->blame.thread_args);
5401 		if (errcode)
5402 			return got_error_set_errno(errcode, "pthread_create");
5403 
5404 		halfdelay(1); /* fast refresh while annotating  */
5405 	}
5406 
5407 	if (s->blame_complete)
5408 		halfdelay(10); /* disable fast refresh */
5409 
5410 	err = draw_blame(view);
5411 
5412 	view_border(view);
5413 	return err;
5414 }
5415 
5416 static const struct got_error *
5417 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5418 {
5419 	const struct got_error *err = NULL, *thread_err = NULL;
5420 	struct tog_view *diff_view;
5421 	struct tog_blame_view_state *s = &view->state.blame;
5422 	int eos, nscroll, begin_y = 0, begin_x = 0;
5423 
5424 	eos = nscroll = view->nlines - 2;
5425 	if (view_is_hsplit_top(view))
5426 		--eos;  /* border */
5427 
5428 	switch (ch) {
5429 	case '0':
5430 		view->x = 0;
5431 		break;
5432 	case '$':
5433 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5434 		view->count = 0;
5435 		break;
5436 	case KEY_RIGHT:
5437 	case 'l':
5438 		if (view->x + view->ncols / 3 < view->maxx)
5439 			view->x += 2;  /* move two columns right */
5440 		else
5441 			view->count = 0;
5442 		break;
5443 	case KEY_LEFT:
5444 	case 'h':
5445 		view->x -= MIN(view->x, 2);  /* move two columns back */
5446 		if (view->x <= 0)
5447 			view->count = 0;
5448 		break;
5449 	case 'q':
5450 		s->done = 1;
5451 		break;
5452 	case 'g':
5453 	case KEY_HOME:
5454 		s->selected_line = 1;
5455 		s->first_displayed_line = 1;
5456 		view->count = 0;
5457 		break;
5458 	case 'G':
5459 	case KEY_END:
5460 		if (s->blame.nlines < eos) {
5461 			s->selected_line = s->blame.nlines;
5462 			s->first_displayed_line = 1;
5463 		} else {
5464 			s->selected_line = eos;
5465 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5466 		}
5467 		view->count = 0;
5468 		break;
5469 	case 'k':
5470 	case KEY_UP:
5471 	case CTRL('p'):
5472 		if (s->selected_line > 1)
5473 			s->selected_line--;
5474 		else if (s->selected_line == 1 &&
5475 		    s->first_displayed_line > 1)
5476 			s->first_displayed_line--;
5477 		else
5478 			view->count = 0;
5479 		break;
5480 	case CTRL('u'):
5481 	case 'u':
5482 		nscroll /= 2;
5483 		/* FALL THROUGH */
5484 	case KEY_PPAGE:
5485 	case CTRL('b'):
5486 	case 'b':
5487 		if (s->first_displayed_line == 1) {
5488 			if (view->count > 1)
5489 				nscroll += nscroll;
5490 			s->selected_line = MAX(1, s->selected_line - nscroll);
5491 			view->count = 0;
5492 			break;
5493 		}
5494 		if (s->first_displayed_line > nscroll)
5495 			s->first_displayed_line -= nscroll;
5496 		else
5497 			s->first_displayed_line = 1;
5498 		break;
5499 	case 'j':
5500 	case KEY_DOWN:
5501 	case CTRL('n'):
5502 		if (s->selected_line < eos && s->first_displayed_line +
5503 		    s->selected_line <= s->blame.nlines)
5504 			s->selected_line++;
5505 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5506 			s->first_displayed_line++;
5507 		else
5508 			view->count = 0;
5509 		break;
5510 	case 'c':
5511 	case 'p': {
5512 		struct got_object_id *id = NULL;
5513 
5514 		view->count = 0;
5515 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5516 		    s->first_displayed_line, s->selected_line);
5517 		if (id == NULL)
5518 			break;
5519 		if (ch == 'p') {
5520 			struct got_commit_object *commit, *pcommit;
5521 			struct got_object_qid *pid;
5522 			struct got_object_id *blob_id = NULL;
5523 			int obj_type;
5524 			err = got_object_open_as_commit(&commit,
5525 			    s->repo, id);
5526 			if (err)
5527 				break;
5528 			pid = STAILQ_FIRST(
5529 			    got_object_commit_get_parent_ids(commit));
5530 			if (pid == NULL) {
5531 				got_object_commit_close(commit);
5532 				break;
5533 			}
5534 			/* Check if path history ends here. */
5535 			err = got_object_open_as_commit(&pcommit,
5536 			    s->repo, &pid->id);
5537 			if (err)
5538 				break;
5539 			err = got_object_id_by_path(&blob_id, s->repo,
5540 			    pcommit, s->path);
5541 			got_object_commit_close(pcommit);
5542 			if (err) {
5543 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5544 					err = NULL;
5545 				got_object_commit_close(commit);
5546 				break;
5547 			}
5548 			err = got_object_get_type(&obj_type, s->repo,
5549 			    blob_id);
5550 			free(blob_id);
5551 			/* Can't blame non-blob type objects. */
5552 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5553 				got_object_commit_close(commit);
5554 				break;
5555 			}
5556 			err = got_object_qid_alloc(&s->blamed_commit,
5557 			    &pid->id);
5558 			got_object_commit_close(commit);
5559 		} else {
5560 			if (got_object_id_cmp(id,
5561 			    &s->blamed_commit->id) == 0)
5562 				break;
5563 			err = got_object_qid_alloc(&s->blamed_commit,
5564 			    id);
5565 		}
5566 		if (err)
5567 			break;
5568 		s->done = 1;
5569 		thread_err = stop_blame(&s->blame);
5570 		s->done = 0;
5571 		if (thread_err)
5572 			break;
5573 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5574 		    s->blamed_commit, entry);
5575 		err = run_blame(view);
5576 		if (err)
5577 			break;
5578 		break;
5579 	}
5580 	case 'C': {
5581 		struct got_object_qid *first;
5582 
5583 		view->count = 0;
5584 		first = STAILQ_FIRST(&s->blamed_commits);
5585 		if (!got_object_id_cmp(&first->id, s->commit_id))
5586 			break;
5587 		s->done = 1;
5588 		thread_err = stop_blame(&s->blame);
5589 		s->done = 0;
5590 		if (thread_err)
5591 			break;
5592 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5593 		got_object_qid_free(s->blamed_commit);
5594 		s->blamed_commit =
5595 		    STAILQ_FIRST(&s->blamed_commits);
5596 		err = run_blame(view);
5597 		if (err)
5598 			break;
5599 		break;
5600 	}
5601 	case KEY_ENTER:
5602 	case '\r': {
5603 		struct got_object_id *id = NULL;
5604 		struct got_object_qid *pid;
5605 		struct got_commit_object *commit = NULL;
5606 
5607 		view->count = 0;
5608 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5609 		    s->first_displayed_line, s->selected_line);
5610 		if (id == NULL)
5611 			break;
5612 		err = got_object_open_as_commit(&commit, s->repo, id);
5613 		if (err)
5614 			break;
5615 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5616 		if (view_is_parent_view(view))
5617 			view_get_split(view, &begin_y, &begin_x);
5618 
5619 		diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
5620 		if (diff_view == NULL) {
5621 			got_object_commit_close(commit);
5622 			err = got_error_from_errno("view_open");
5623 			break;
5624 		}
5625 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5626 		    id, NULL, NULL, 3, 0, 0, NULL, s->repo);
5627 		got_object_commit_close(commit);
5628 		if (err) {
5629 			view_close(diff_view);
5630 			break;
5631 		}
5632 		if (view_is_parent_view(view) &&
5633 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5634 			err = view_init_hsplit(view, begin_y);
5635 			if (err)
5636 				break;
5637 		}
5638 
5639 		view->focussed = 0;
5640 		diff_view->focussed = 1;
5641 		diff_view->mode = view->mode;
5642 		diff_view->nlines = view->lines - begin_y;
5643 		if (view_is_parent_view(view)) {
5644 			err = view_close_child(view);
5645 			if (err)
5646 				break;
5647 			err = view_set_child(view, diff_view);
5648 			if (err)
5649 				break;
5650 			view->focus_child = 1;
5651 		} else
5652 			*new_view = diff_view;
5653 		if (err)
5654 			break;
5655 		break;
5656 	}
5657 	case CTRL('d'):
5658 	case 'd':
5659 		nscroll /= 2;
5660 		/* FALL THROUGH */
5661 	case KEY_NPAGE:
5662 	case CTRL('f'):
5663 	case 'f':
5664 	case ' ':
5665 		if (s->last_displayed_line >= s->blame.nlines &&
5666 		    s->selected_line >= MIN(s->blame.nlines,
5667 		    view->nlines - 2)) {
5668 			view->count = 0;
5669 			break;
5670 		}
5671 		if (s->last_displayed_line >= s->blame.nlines &&
5672 		    s->selected_line < view->nlines - 2) {
5673 			s->selected_line +=
5674 			    MIN(nscroll, s->last_displayed_line -
5675 			    s->first_displayed_line - s->selected_line + 1);
5676 		}
5677 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5678 			s->first_displayed_line += nscroll;
5679 		else
5680 			s->first_displayed_line =
5681 			    s->blame.nlines - (view->nlines - 3);
5682 		break;
5683 	case KEY_RESIZE:
5684 		if (s->selected_line > view->nlines - 2) {
5685 			s->selected_line = MIN(s->blame.nlines,
5686 			    view->nlines - 2);
5687 		}
5688 		break;
5689 	default:
5690 		view->count = 0;
5691 		break;
5692 	}
5693 	return thread_err ? thread_err : err;
5694 }
5695 
5696 static const struct got_error *
5697 reset_blame_view(struct tog_view *view)
5698 {
5699 	const struct got_error *err;
5700 	struct tog_blame_view_state *s = &view->state.blame;
5701 
5702 	view->count = 0;
5703 	s->done = 1;
5704 	err = stop_blame(&s->blame);
5705 	s->done = 0;
5706 	if (err)
5707 		return err;
5708 	return run_blame(view);
5709 }
5710 
5711 static const struct got_error *
5712 cmd_blame(int argc, char *argv[])
5713 {
5714 	const struct got_error *error;
5715 	struct got_repository *repo = NULL;
5716 	struct got_worktree *worktree = NULL;
5717 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
5718 	char *link_target = NULL;
5719 	struct got_object_id *commit_id = NULL;
5720 	struct got_commit_object *commit = NULL;
5721 	char *commit_id_str = NULL;
5722 	int ch;
5723 	struct tog_view *view;
5724 	int *pack_fds = NULL;
5725 
5726 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
5727 		switch (ch) {
5728 		case 'c':
5729 			commit_id_str = optarg;
5730 			break;
5731 		case 'r':
5732 			repo_path = realpath(optarg, NULL);
5733 			if (repo_path == NULL)
5734 				return got_error_from_errno2("realpath",
5735 				    optarg);
5736 			break;
5737 		default:
5738 			usage_blame();
5739 			/* NOTREACHED */
5740 		}
5741 	}
5742 
5743 	argc -= optind;
5744 	argv += optind;
5745 
5746 	if (argc != 1)
5747 		usage_blame();
5748 
5749 	error = got_repo_pack_fds_open(&pack_fds);
5750 	if (error != NULL)
5751 		goto done;
5752 
5753 	if (repo_path == NULL) {
5754 		cwd = getcwd(NULL, 0);
5755 		if (cwd == NULL)
5756 			return got_error_from_errno("getcwd");
5757 		error = got_worktree_open(&worktree, cwd);
5758 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5759 			goto done;
5760 		if (worktree)
5761 			repo_path =
5762 			    strdup(got_worktree_get_repo_path(worktree));
5763 		else
5764 			repo_path = strdup(cwd);
5765 		if (repo_path == NULL) {
5766 			error = got_error_from_errno("strdup");
5767 			goto done;
5768 		}
5769 	}
5770 
5771 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5772 	if (error != NULL)
5773 		goto done;
5774 
5775 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
5776 	    worktree);
5777 	if (error)
5778 		goto done;
5779 
5780 	init_curses();
5781 
5782 	error = apply_unveil(got_repo_get_path(repo), NULL);
5783 	if (error)
5784 		goto done;
5785 
5786 	error = tog_load_refs(repo, 0);
5787 	if (error)
5788 		goto done;
5789 
5790 	if (commit_id_str == NULL) {
5791 		struct got_reference *head_ref;
5792 		error = got_ref_open(&head_ref, repo, worktree ?
5793 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
5794 		if (error != NULL)
5795 			goto done;
5796 		error = got_ref_resolve(&commit_id, repo, head_ref);
5797 		got_ref_close(head_ref);
5798 	} else {
5799 		error = got_repo_match_object_id(&commit_id, NULL,
5800 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5801 	}
5802 	if (error != NULL)
5803 		goto done;
5804 
5805 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
5806 	if (view == NULL) {
5807 		error = got_error_from_errno("view_open");
5808 		goto done;
5809 	}
5810 
5811 	error = got_object_open_as_commit(&commit, repo, commit_id);
5812 	if (error)
5813 		goto done;
5814 
5815 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
5816 	    commit, repo);
5817 	if (error)
5818 		goto done;
5819 
5820 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
5821 	    commit_id, repo);
5822 	if (error)
5823 		goto done;
5824 	if (worktree) {
5825 		/* Release work tree lock. */
5826 		got_worktree_close(worktree);
5827 		worktree = NULL;
5828 	}
5829 	error = view_loop(view);
5830 done:
5831 	free(repo_path);
5832 	free(in_repo_path);
5833 	free(link_target);
5834 	free(cwd);
5835 	free(commit_id);
5836 	if (commit)
5837 		got_object_commit_close(commit);
5838 	if (worktree)
5839 		got_worktree_close(worktree);
5840 	if (repo) {
5841 		const struct got_error *close_err = got_repo_close(repo);
5842 		if (error == NULL)
5843 			error = close_err;
5844 	}
5845 	if (pack_fds) {
5846 		const struct got_error *pack_err =
5847 		    got_repo_pack_fds_close(pack_fds);
5848 		if (error == NULL)
5849 			error = pack_err;
5850 	}
5851 	tog_free_refs();
5852 	return error;
5853 }
5854 
5855 static const struct got_error *
5856 draw_tree_entries(struct tog_view *view, const char *parent_path)
5857 {
5858 	struct tog_tree_view_state *s = &view->state.tree;
5859 	const struct got_error *err = NULL;
5860 	struct got_tree_entry *te;
5861 	wchar_t *wline;
5862 	struct tog_color *tc;
5863 	int width, n, i, nentries;
5864 	int limit = view->nlines;
5865 
5866 	s->ndisplayed = 0;
5867 	if (view_is_hsplit_top(view))
5868 		--limit;  /* border */
5869 
5870 	werase(view->window);
5871 
5872 	if (limit == 0)
5873 		return NULL;
5874 
5875 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
5876 	    0, 0);
5877 	if (err)
5878 		return err;
5879 	if (view_needs_focus_indication(view))
5880 		wstandout(view->window);
5881 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5882 	if (tc)
5883 		wattr_on(view->window,
5884 		    COLOR_PAIR(tc->colorpair), NULL);
5885 	waddwstr(view->window, wline);
5886 	if (tc)
5887 		wattr_off(view->window,
5888 		    COLOR_PAIR(tc->colorpair), NULL);
5889 	if (view_needs_focus_indication(view))
5890 		wstandend(view->window);
5891 	free(wline);
5892 	wline = NULL;
5893 	if (width < view->ncols - 1)
5894 		waddch(view->window, '\n');
5895 	if (--limit <= 0)
5896 		return NULL;
5897 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
5898 	    0, 0);
5899 	if (err)
5900 		return err;
5901 	waddwstr(view->window, wline);
5902 	free(wline);
5903 	wline = NULL;
5904 	if (width < view->ncols - 1)
5905 		waddch(view->window, '\n');
5906 	if (--limit <= 0)
5907 		return NULL;
5908 	waddch(view->window, '\n');
5909 	if (--limit <= 0)
5910 		return NULL;
5911 
5912 	if (s->first_displayed_entry == NULL) {
5913 		te = got_object_tree_get_first_entry(s->tree);
5914 		if (s->selected == 0) {
5915 			if (view->focussed)
5916 				wstandout(view->window);
5917 			s->selected_entry = NULL;
5918 		}
5919 		waddstr(view->window, "  ..\n");	/* parent directory */
5920 		if (s->selected == 0 && view->focussed)
5921 			wstandend(view->window);
5922 		s->ndisplayed++;
5923 		if (--limit <= 0)
5924 			return NULL;
5925 		n = 1;
5926 	} else {
5927 		n = 0;
5928 		te = s->first_displayed_entry;
5929 	}
5930 
5931 	nentries = got_object_tree_get_nentries(s->tree);
5932 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
5933 		char *line = NULL, *id_str = NULL, *link_target = NULL;
5934 		const char *modestr = "";
5935 		mode_t mode;
5936 
5937 		te = got_object_tree_get_entry(s->tree, i);
5938 		mode = got_tree_entry_get_mode(te);
5939 
5940 		if (s->show_ids) {
5941 			err = got_object_id_str(&id_str,
5942 			    got_tree_entry_get_id(te));
5943 			if (err)
5944 				return got_error_from_errno(
5945 				    "got_object_id_str");
5946 		}
5947 		if (got_object_tree_entry_is_submodule(te))
5948 			modestr = "$";
5949 		else if (S_ISLNK(mode)) {
5950 			int i;
5951 
5952 			err = got_tree_entry_get_symlink_target(&link_target,
5953 			    te, s->repo);
5954 			if (err) {
5955 				free(id_str);
5956 				return err;
5957 			}
5958 			for (i = 0; i < strlen(link_target); i++) {
5959 				if (!isprint((unsigned char)link_target[i]))
5960 					link_target[i] = '?';
5961 			}
5962 			modestr = "@";
5963 		}
5964 		else if (S_ISDIR(mode))
5965 			modestr = "/";
5966 		else if (mode & S_IXUSR)
5967 			modestr = "*";
5968 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
5969 		    got_tree_entry_get_name(te), modestr,
5970 		    link_target ? " -> ": "",
5971 		    link_target ? link_target : "") == -1) {
5972 			free(id_str);
5973 			free(link_target);
5974 			return got_error_from_errno("asprintf");
5975 		}
5976 		free(id_str);
5977 		free(link_target);
5978 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
5979 		    0, 0);
5980 		if (err) {
5981 			free(line);
5982 			break;
5983 		}
5984 		if (n == s->selected) {
5985 			if (view->focussed)
5986 				wstandout(view->window);
5987 			s->selected_entry = te;
5988 		}
5989 		tc = match_color(&s->colors, line);
5990 		if (tc)
5991 			wattr_on(view->window,
5992 			    COLOR_PAIR(tc->colorpair), NULL);
5993 		waddwstr(view->window, wline);
5994 		if (tc)
5995 			wattr_off(view->window,
5996 			    COLOR_PAIR(tc->colorpair), NULL);
5997 		if (width < view->ncols - 1)
5998 			waddch(view->window, '\n');
5999 		if (n == s->selected && view->focussed)
6000 			wstandend(view->window);
6001 		free(line);
6002 		free(wline);
6003 		wline = NULL;
6004 		n++;
6005 		s->ndisplayed++;
6006 		s->last_displayed_entry = te;
6007 		if (--limit <= 0)
6008 			break;
6009 	}
6010 
6011 	return err;
6012 }
6013 
6014 static void
6015 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6016 {
6017 	struct got_tree_entry *te;
6018 	int isroot = s->tree == s->root;
6019 	int i = 0;
6020 
6021 	if (s->first_displayed_entry == NULL)
6022 		return;
6023 
6024 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6025 	while (i++ < maxscroll) {
6026 		if (te == NULL) {
6027 			if (!isroot)
6028 				s->first_displayed_entry = NULL;
6029 			break;
6030 		}
6031 		s->first_displayed_entry = te;
6032 		te = got_tree_entry_get_prev(s->tree, te);
6033 	}
6034 }
6035 
6036 static const struct got_error *
6037 tree_scroll_down(struct tog_view *view, int maxscroll)
6038 {
6039 	struct tog_tree_view_state *s = &view->state.tree;
6040 	struct got_tree_entry *next, *last;
6041 	int n = 0;
6042 
6043 	if (s->first_displayed_entry)
6044 		next = got_tree_entry_get_next(s->tree,
6045 		    s->first_displayed_entry);
6046 	else
6047 		next = got_object_tree_get_first_entry(s->tree);
6048 
6049 	last = s->last_displayed_entry;
6050 	while (next && n++ < maxscroll) {
6051 		if (last)
6052 			last = got_tree_entry_get_next(s->tree, last);
6053 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6054 			s->first_displayed_entry = next;
6055 			next = got_tree_entry_get_next(s->tree, next);
6056 		}
6057 	}
6058 
6059 	return NULL;
6060 }
6061 
6062 static const struct got_error *
6063 tree_entry_path(char **path, struct tog_parent_trees *parents,
6064     struct got_tree_entry *te)
6065 {
6066 	const struct got_error *err = NULL;
6067 	struct tog_parent_tree *pt;
6068 	size_t len = 2; /* for leading slash and NUL */
6069 
6070 	TAILQ_FOREACH(pt, parents, entry)
6071 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6072 		    + 1 /* slash */;
6073 	if (te)
6074 		len += strlen(got_tree_entry_get_name(te));
6075 
6076 	*path = calloc(1, len);
6077 	if (path == NULL)
6078 		return got_error_from_errno("calloc");
6079 
6080 	(*path)[0] = '/';
6081 	pt = TAILQ_LAST(parents, tog_parent_trees);
6082 	while (pt) {
6083 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6084 		if (strlcat(*path, name, len) >= len) {
6085 			err = got_error(GOT_ERR_NO_SPACE);
6086 			goto done;
6087 		}
6088 		if (strlcat(*path, "/", len) >= len) {
6089 			err = got_error(GOT_ERR_NO_SPACE);
6090 			goto done;
6091 		}
6092 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6093 	}
6094 	if (te) {
6095 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6096 			err = got_error(GOT_ERR_NO_SPACE);
6097 			goto done;
6098 		}
6099 	}
6100 done:
6101 	if (err) {
6102 		free(*path);
6103 		*path = NULL;
6104 	}
6105 	return err;
6106 }
6107 
6108 static const struct got_error *
6109 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6110     struct got_tree_entry *te, struct tog_parent_trees *parents,
6111     struct got_object_id *commit_id, struct got_repository *repo)
6112 {
6113 	const struct got_error *err = NULL;
6114 	char *path;
6115 	struct tog_view *blame_view;
6116 
6117 	*new_view = NULL;
6118 
6119 	err = tree_entry_path(&path, parents, te);
6120 	if (err)
6121 		return err;
6122 
6123 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6124 	if (blame_view == NULL) {
6125 		err = got_error_from_errno("view_open");
6126 		goto done;
6127 	}
6128 
6129 	err = open_blame_view(blame_view, path, commit_id, repo);
6130 	if (err) {
6131 		if (err->code == GOT_ERR_CANCELLED)
6132 			err = NULL;
6133 		view_close(blame_view);
6134 	} else
6135 		*new_view = blame_view;
6136 done:
6137 	free(path);
6138 	return err;
6139 }
6140 
6141 static const struct got_error *
6142 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6143     struct tog_tree_view_state *s)
6144 {
6145 	struct tog_view *log_view;
6146 	const struct got_error *err = NULL;
6147 	char *path;
6148 
6149 	*new_view = NULL;
6150 
6151 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6152 	if (log_view == NULL)
6153 		return got_error_from_errno("view_open");
6154 
6155 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6156 	if (err)
6157 		return err;
6158 
6159 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6160 	    path, 0);
6161 	if (err)
6162 		view_close(log_view);
6163 	else
6164 		*new_view = log_view;
6165 	free(path);
6166 	return err;
6167 }
6168 
6169 static const struct got_error *
6170 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6171     const char *head_ref_name, struct got_repository *repo)
6172 {
6173 	const struct got_error *err = NULL;
6174 	char *commit_id_str = NULL;
6175 	struct tog_tree_view_state *s = &view->state.tree;
6176 	struct got_commit_object *commit = NULL;
6177 
6178 	TAILQ_INIT(&s->parents);
6179 	STAILQ_INIT(&s->colors);
6180 
6181 	s->commit_id = got_object_id_dup(commit_id);
6182 	if (s->commit_id == NULL)
6183 		return got_error_from_errno("got_object_id_dup");
6184 
6185 	err = got_object_open_as_commit(&commit, repo, commit_id);
6186 	if (err)
6187 		goto done;
6188 
6189 	/*
6190 	 * The root is opened here and will be closed when the view is closed.
6191 	 * Any visited subtrees and their path-wise parents are opened and
6192 	 * closed on demand.
6193 	 */
6194 	err = got_object_open_as_tree(&s->root, repo,
6195 	    got_object_commit_get_tree_id(commit));
6196 	if (err)
6197 		goto done;
6198 	s->tree = s->root;
6199 
6200 	err = got_object_id_str(&commit_id_str, commit_id);
6201 	if (err != NULL)
6202 		goto done;
6203 
6204 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6205 		err = got_error_from_errno("asprintf");
6206 		goto done;
6207 	}
6208 
6209 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6210 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6211 	if (head_ref_name) {
6212 		s->head_ref_name = strdup(head_ref_name);
6213 		if (s->head_ref_name == NULL) {
6214 			err = got_error_from_errno("strdup");
6215 			goto done;
6216 		}
6217 	}
6218 	s->repo = repo;
6219 
6220 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6221 		err = add_color(&s->colors, "\\$$",
6222 		    TOG_COLOR_TREE_SUBMODULE,
6223 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6224 		if (err)
6225 			goto done;
6226 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6227 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6228 		if (err)
6229 			goto done;
6230 		err = add_color(&s->colors, "/$",
6231 		    TOG_COLOR_TREE_DIRECTORY,
6232 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6233 		if (err)
6234 			goto done;
6235 
6236 		err = add_color(&s->colors, "\\*$",
6237 		    TOG_COLOR_TREE_EXECUTABLE,
6238 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6239 		if (err)
6240 			goto done;
6241 
6242 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6243 		    get_color_value("TOG_COLOR_COMMIT"));
6244 		if (err)
6245 			goto done;
6246 	}
6247 
6248 	view->show = show_tree_view;
6249 	view->input = input_tree_view;
6250 	view->close = close_tree_view;
6251 	view->search_start = search_start_tree_view;
6252 	view->search_next = search_next_tree_view;
6253 done:
6254 	free(commit_id_str);
6255 	if (commit)
6256 		got_object_commit_close(commit);
6257 	if (err)
6258 		close_tree_view(view);
6259 	return err;
6260 }
6261 
6262 static const struct got_error *
6263 close_tree_view(struct tog_view *view)
6264 {
6265 	struct tog_tree_view_state *s = &view->state.tree;
6266 
6267 	free_colors(&s->colors);
6268 	free(s->tree_label);
6269 	s->tree_label = NULL;
6270 	free(s->commit_id);
6271 	s->commit_id = NULL;
6272 	free(s->head_ref_name);
6273 	s->head_ref_name = NULL;
6274 	while (!TAILQ_EMPTY(&s->parents)) {
6275 		struct tog_parent_tree *parent;
6276 		parent = TAILQ_FIRST(&s->parents);
6277 		TAILQ_REMOVE(&s->parents, parent, entry);
6278 		if (parent->tree != s->root)
6279 			got_object_tree_close(parent->tree);
6280 		free(parent);
6281 
6282 	}
6283 	if (s->tree != NULL && s->tree != s->root)
6284 		got_object_tree_close(s->tree);
6285 	if (s->root)
6286 		got_object_tree_close(s->root);
6287 	return NULL;
6288 }
6289 
6290 static const struct got_error *
6291 search_start_tree_view(struct tog_view *view)
6292 {
6293 	struct tog_tree_view_state *s = &view->state.tree;
6294 
6295 	s->matched_entry = NULL;
6296 	return NULL;
6297 }
6298 
6299 static int
6300 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6301 {
6302 	regmatch_t regmatch;
6303 
6304 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6305 	    0) == 0;
6306 }
6307 
6308 static const struct got_error *
6309 search_next_tree_view(struct tog_view *view)
6310 {
6311 	struct tog_tree_view_state *s = &view->state.tree;
6312 	struct got_tree_entry *te = NULL;
6313 
6314 	if (!view->searching) {
6315 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6316 		return NULL;
6317 	}
6318 
6319 	if (s->matched_entry) {
6320 		if (view->searching == TOG_SEARCH_FORWARD) {
6321 			if (s->selected_entry)
6322 				te = got_tree_entry_get_next(s->tree,
6323 				    s->selected_entry);
6324 			else
6325 				te = got_object_tree_get_first_entry(s->tree);
6326 		} else {
6327 			if (s->selected_entry == NULL)
6328 				te = got_object_tree_get_last_entry(s->tree);
6329 			else
6330 				te = got_tree_entry_get_prev(s->tree,
6331 				    s->selected_entry);
6332 		}
6333 	} else {
6334 		if (s->selected_entry)
6335 			te = s->selected_entry;
6336 		else if (view->searching == TOG_SEARCH_FORWARD)
6337 			te = got_object_tree_get_first_entry(s->tree);
6338 		else
6339 			te = got_object_tree_get_last_entry(s->tree);
6340 	}
6341 
6342 	while (1) {
6343 		if (te == NULL) {
6344 			if (s->matched_entry == NULL) {
6345 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6346 				return NULL;
6347 			}
6348 			if (view->searching == TOG_SEARCH_FORWARD)
6349 				te = got_object_tree_get_first_entry(s->tree);
6350 			else
6351 				te = got_object_tree_get_last_entry(s->tree);
6352 		}
6353 
6354 		if (match_tree_entry(te, &view->regex)) {
6355 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6356 			s->matched_entry = te;
6357 			break;
6358 		}
6359 
6360 		if (view->searching == TOG_SEARCH_FORWARD)
6361 			te = got_tree_entry_get_next(s->tree, te);
6362 		else
6363 			te = got_tree_entry_get_prev(s->tree, te);
6364 	}
6365 
6366 	if (s->matched_entry) {
6367 		s->first_displayed_entry = s->matched_entry;
6368 		s->selected = 0;
6369 	}
6370 
6371 	return NULL;
6372 }
6373 
6374 static const struct got_error *
6375 show_tree_view(struct tog_view *view)
6376 {
6377 	const struct got_error *err = NULL;
6378 	struct tog_tree_view_state *s = &view->state.tree;
6379 	char *parent_path;
6380 
6381 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6382 	if (err)
6383 		return err;
6384 
6385 	err = draw_tree_entries(view, parent_path);
6386 	free(parent_path);
6387 
6388 	view_border(view);
6389 	return err;
6390 }
6391 
6392 static const struct got_error *
6393 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6394 {
6395 	const struct got_error *err = NULL;
6396 	struct tog_tree_view_state *s = &view->state.tree;
6397 	struct tog_view *log_view, *ref_view;
6398 	struct got_tree_entry *te;
6399 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6400 
6401 	switch (ch) {
6402 	case 'i':
6403 		s->show_ids = !s->show_ids;
6404 		view->count = 0;
6405 		break;
6406 	case 'l':
6407 		view->count = 0;
6408 		if (!s->selected_entry)
6409 			break;
6410 		if (view_is_parent_view(view))
6411 			view_get_split(view, &begin_y, &begin_x);
6412 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6413 		if (view_is_parent_view(view) &&
6414 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6415 			err = view_init_hsplit(view, begin_y);
6416 			if (err)
6417 				break;
6418 		}
6419 		view->focussed = 0;
6420 		log_view->focussed = 1;
6421 		log_view->mode = view->mode;
6422 		log_view->nlines = view->lines - begin_y;
6423 		if (view_is_parent_view(view)) {
6424 			err = view_close_child(view);
6425 			if (err)
6426 				return err;
6427 			err = view_set_child(view, log_view);
6428 			if (err)
6429 				return err;
6430 			view->focus_child = 1;
6431 		} else
6432 			*new_view = log_view;
6433 		break;
6434 	case 'r':
6435 		view->count = 0;
6436 		if (view_is_parent_view(view))
6437 			view_get_split(view, &begin_y, &begin_x);
6438 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6439 		if (ref_view == NULL)
6440 			return got_error_from_errno("view_open");
6441 		err = open_ref_view(ref_view, s->repo);
6442 		if (err) {
6443 			view_close(ref_view);
6444 			return err;
6445 		}
6446 		if (view_is_parent_view(view) &&
6447 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6448 			err = view_init_hsplit(view, begin_y);
6449 			if (err)
6450 				break;
6451 		}
6452 		view->focussed = 0;
6453 		ref_view->focussed = 1;
6454 		ref_view->mode = view->mode;
6455 		ref_view->nlines = view->lines - begin_y;
6456 		if (view_is_parent_view(view)) {
6457 			err = view_close_child(view);
6458 			if (err)
6459 				return err;
6460 			err = view_set_child(view, ref_view);
6461 			if (err)
6462 				return err;
6463 			view->focus_child = 1;
6464 		} else
6465 			*new_view = ref_view;
6466 		break;
6467 	case 'g':
6468 	case KEY_HOME:
6469 		s->selected = 0;
6470 		view->count = 0;
6471 		if (s->tree == s->root)
6472 			s->first_displayed_entry =
6473 			    got_object_tree_get_first_entry(s->tree);
6474 		else
6475 			s->first_displayed_entry = NULL;
6476 		break;
6477 	case 'G':
6478 	case KEY_END: {
6479 		int eos = view->nlines - 3;
6480 
6481 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6482 			--eos;  /* border */
6483 		s->selected = 0;
6484 		view->count = 0;
6485 		te = got_object_tree_get_last_entry(s->tree);
6486 		for (n = 0; n < eos; n++) {
6487 			if (te == NULL) {
6488 				if(s->tree != s->root) {
6489 					s->first_displayed_entry = NULL;
6490 					n++;
6491 				}
6492 				break;
6493 			}
6494 			s->first_displayed_entry = te;
6495 			te = got_tree_entry_get_prev(s->tree, te);
6496 		}
6497 		if (n > 0)
6498 			s->selected = n - 1;
6499 		break;
6500 	}
6501 	case 'k':
6502 	case KEY_UP:
6503 	case CTRL('p'):
6504 		if (s->selected > 0) {
6505 			s->selected--;
6506 			break;
6507 		}
6508 		tree_scroll_up(s, 1);
6509 		if (s->selected_entry == NULL ||
6510 		    (s->tree == s->root && s->selected_entry ==
6511 		     got_object_tree_get_first_entry(s->tree)))
6512 			view->count = 0;
6513 		break;
6514 	case CTRL('u'):
6515 	case 'u':
6516 		nscroll /= 2;
6517 		/* FALL THROUGH */
6518 	case KEY_PPAGE:
6519 	case CTRL('b'):
6520 	case 'b':
6521 		if (s->tree == s->root) {
6522 			if (got_object_tree_get_first_entry(s->tree) ==
6523 			    s->first_displayed_entry)
6524 				s->selected -= MIN(s->selected, nscroll);
6525 		} else {
6526 			if (s->first_displayed_entry == NULL)
6527 				s->selected -= MIN(s->selected, nscroll);
6528 		}
6529 		tree_scroll_up(s, MAX(0, nscroll));
6530 		if (s->selected_entry == NULL ||
6531 		    (s->tree == s->root && s->selected_entry ==
6532 		     got_object_tree_get_first_entry(s->tree)))
6533 			view->count = 0;
6534 		break;
6535 	case 'j':
6536 	case KEY_DOWN:
6537 	case CTRL('n'):
6538 		if (s->selected < s->ndisplayed - 1) {
6539 			s->selected++;
6540 			break;
6541 		}
6542 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6543 		    == NULL) {
6544 			/* can't scroll any further */
6545 			view->count = 0;
6546 			break;
6547 		}
6548 		tree_scroll_down(view, 1);
6549 		break;
6550 	case CTRL('d'):
6551 	case 'd':
6552 		nscroll /= 2;
6553 		/* FALL THROUGH */
6554 	case KEY_NPAGE:
6555 	case CTRL('f'):
6556 	case 'f':
6557 	case ' ':
6558 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6559 		    == NULL) {
6560 			/* can't scroll any further; move cursor down */
6561 			if (s->selected < s->ndisplayed - 1)
6562 				s->selected += MIN(nscroll,
6563 				    s->ndisplayed - s->selected - 1);
6564 			else
6565 				view->count = 0;
6566 			break;
6567 		}
6568 		tree_scroll_down(view, nscroll);
6569 		break;
6570 	case KEY_ENTER:
6571 	case '\r':
6572 	case KEY_BACKSPACE:
6573 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6574 			struct tog_parent_tree *parent;
6575 			/* user selected '..' */
6576 			if (s->tree == s->root) {
6577 				view->count = 0;
6578 				break;
6579 			}
6580 			parent = TAILQ_FIRST(&s->parents);
6581 			TAILQ_REMOVE(&s->parents, parent,
6582 			    entry);
6583 			got_object_tree_close(s->tree);
6584 			s->tree = parent->tree;
6585 			s->first_displayed_entry =
6586 			    parent->first_displayed_entry;
6587 			s->selected_entry =
6588 			    parent->selected_entry;
6589 			s->selected = parent->selected;
6590 			if (s->selected > view->nlines - 3) {
6591 				err = offset_selection_down(view);
6592 				if (err)
6593 					break;
6594 			}
6595 			free(parent);
6596 		} else if (S_ISDIR(got_tree_entry_get_mode(
6597 		    s->selected_entry))) {
6598 			struct got_tree_object *subtree;
6599 			view->count = 0;
6600 			err = got_object_open_as_tree(&subtree, s->repo,
6601 			    got_tree_entry_get_id(s->selected_entry));
6602 			if (err)
6603 				break;
6604 			err = tree_view_visit_subtree(s, subtree);
6605 			if (err) {
6606 				got_object_tree_close(subtree);
6607 				break;
6608 			}
6609 		} else if (S_ISREG(got_tree_entry_get_mode(
6610 		    s->selected_entry))) {
6611 			struct tog_view *blame_view;
6612 			int begin_x = 0, begin_y = 0;
6613 
6614 			if (view_is_parent_view(view))
6615 				view_get_split(view, &begin_y, &begin_x);
6616 
6617 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6618 			    s->selected_entry, &s->parents,
6619 			    s->commit_id, s->repo);
6620 			if (err)
6621 				break;
6622 
6623 			if (view_is_parent_view(view) &&
6624 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
6625 				err = view_init_hsplit(view, begin_y);
6626 				if (err)
6627 					break;
6628 			}
6629 
6630 			view->count = 0;
6631 			view->focussed = 0;
6632 			blame_view->focussed = 1;
6633 			blame_view->mode = view->mode;
6634 			blame_view->nlines = view->lines - begin_y;
6635 			if (view_is_parent_view(view)) {
6636 				err = view_close_child(view);
6637 				if (err)
6638 					return err;
6639 				err = view_set_child(view, blame_view);
6640 				if (err)
6641 					return err;
6642 				view->focus_child = 1;
6643 			} else
6644 				*new_view = blame_view;
6645 		}
6646 		break;
6647 	case KEY_RESIZE:
6648 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6649 			s->selected = view->nlines - 4;
6650 		view->count = 0;
6651 		break;
6652 	default:
6653 		view->count = 0;
6654 		break;
6655 	}
6656 
6657 	return err;
6658 }
6659 
6660 __dead static void
6661 usage_tree(void)
6662 {
6663 	endwin();
6664 	fprintf(stderr,
6665 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6666 	    getprogname());
6667 	exit(1);
6668 }
6669 
6670 static const struct got_error *
6671 cmd_tree(int argc, char *argv[])
6672 {
6673 	const struct got_error *error;
6674 	struct got_repository *repo = NULL;
6675 	struct got_worktree *worktree = NULL;
6676 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6677 	struct got_object_id *commit_id = NULL;
6678 	struct got_commit_object *commit = NULL;
6679 	const char *commit_id_arg = NULL;
6680 	char *label = NULL;
6681 	struct got_reference *ref = NULL;
6682 	const char *head_ref_name = NULL;
6683 	int ch;
6684 	struct tog_view *view;
6685 	int *pack_fds = NULL;
6686 
6687 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6688 		switch (ch) {
6689 		case 'c':
6690 			commit_id_arg = optarg;
6691 			break;
6692 		case 'r':
6693 			repo_path = realpath(optarg, NULL);
6694 			if (repo_path == NULL)
6695 				return got_error_from_errno2("realpath",
6696 				    optarg);
6697 			break;
6698 		default:
6699 			usage_tree();
6700 			/* NOTREACHED */
6701 		}
6702 	}
6703 
6704 	argc -= optind;
6705 	argv += optind;
6706 
6707 	if (argc > 1)
6708 		usage_tree();
6709 
6710 	error = got_repo_pack_fds_open(&pack_fds);
6711 	if (error != NULL)
6712 		goto done;
6713 
6714 	if (repo_path == NULL) {
6715 		cwd = getcwd(NULL, 0);
6716 		if (cwd == NULL)
6717 			return got_error_from_errno("getcwd");
6718 		error = got_worktree_open(&worktree, cwd);
6719 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6720 			goto done;
6721 		if (worktree)
6722 			repo_path =
6723 			    strdup(got_worktree_get_repo_path(worktree));
6724 		else
6725 			repo_path = strdup(cwd);
6726 		if (repo_path == NULL) {
6727 			error = got_error_from_errno("strdup");
6728 			goto done;
6729 		}
6730 	}
6731 
6732 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6733 	if (error != NULL)
6734 		goto done;
6735 
6736 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
6737 	    repo, worktree);
6738 	if (error)
6739 		goto done;
6740 
6741 	init_curses();
6742 
6743 	error = apply_unveil(got_repo_get_path(repo), NULL);
6744 	if (error)
6745 		goto done;
6746 
6747 	error = tog_load_refs(repo, 0);
6748 	if (error)
6749 		goto done;
6750 
6751 	if (commit_id_arg == NULL) {
6752 		error = got_repo_match_object_id(&commit_id, &label,
6753 		    worktree ? got_worktree_get_head_ref_name(worktree) :
6754 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6755 		if (error)
6756 			goto done;
6757 		head_ref_name = label;
6758 	} else {
6759 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
6760 		if (error == NULL)
6761 			head_ref_name = got_ref_get_name(ref);
6762 		else if (error->code != GOT_ERR_NOT_REF)
6763 			goto done;
6764 		error = got_repo_match_object_id(&commit_id, NULL,
6765 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6766 		if (error)
6767 			goto done;
6768 	}
6769 
6770 	error = got_object_open_as_commit(&commit, repo, commit_id);
6771 	if (error)
6772 		goto done;
6773 
6774 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
6775 	if (view == NULL) {
6776 		error = got_error_from_errno("view_open");
6777 		goto done;
6778 	}
6779 	error = open_tree_view(view, commit_id, head_ref_name, repo);
6780 	if (error)
6781 		goto done;
6782 	if (!got_path_is_root_dir(in_repo_path)) {
6783 		error = tree_view_walk_path(&view->state.tree, commit,
6784 		    in_repo_path);
6785 		if (error)
6786 			goto done;
6787 	}
6788 
6789 	if (worktree) {
6790 		/* Release work tree lock. */
6791 		got_worktree_close(worktree);
6792 		worktree = NULL;
6793 	}
6794 	error = view_loop(view);
6795 done:
6796 	free(repo_path);
6797 	free(cwd);
6798 	free(commit_id);
6799 	free(label);
6800 	if (ref)
6801 		got_ref_close(ref);
6802 	if (repo) {
6803 		const struct got_error *close_err = got_repo_close(repo);
6804 		if (error == NULL)
6805 			error = close_err;
6806 	}
6807 	if (pack_fds) {
6808 		const struct got_error *pack_err =
6809 		    got_repo_pack_fds_close(pack_fds);
6810 		if (error == NULL)
6811 			error = pack_err;
6812 	}
6813 	tog_free_refs();
6814 	return error;
6815 }
6816 
6817 static const struct got_error *
6818 ref_view_load_refs(struct tog_ref_view_state *s)
6819 {
6820 	struct got_reflist_entry *sre;
6821 	struct tog_reflist_entry *re;
6822 
6823 	s->nrefs = 0;
6824 	TAILQ_FOREACH(sre, &tog_refs, entry) {
6825 		if (strncmp(got_ref_get_name(sre->ref),
6826 		    "refs/got/", 9) == 0 &&
6827 		    strncmp(got_ref_get_name(sre->ref),
6828 		    "refs/got/backup/", 16) != 0)
6829 			continue;
6830 
6831 		re = malloc(sizeof(*re));
6832 		if (re == NULL)
6833 			return got_error_from_errno("malloc");
6834 
6835 		re->ref = got_ref_dup(sre->ref);
6836 		if (re->ref == NULL)
6837 			return got_error_from_errno("got_ref_dup");
6838 		re->idx = s->nrefs++;
6839 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
6840 	}
6841 
6842 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
6843 	return NULL;
6844 }
6845 
6846 static void
6847 ref_view_free_refs(struct tog_ref_view_state *s)
6848 {
6849 	struct tog_reflist_entry *re;
6850 
6851 	while (!TAILQ_EMPTY(&s->refs)) {
6852 		re = TAILQ_FIRST(&s->refs);
6853 		TAILQ_REMOVE(&s->refs, re, entry);
6854 		got_ref_close(re->ref);
6855 		free(re);
6856 	}
6857 }
6858 
6859 static const struct got_error *
6860 open_ref_view(struct tog_view *view, struct got_repository *repo)
6861 {
6862 	const struct got_error *err = NULL;
6863 	struct tog_ref_view_state *s = &view->state.ref;
6864 
6865 	s->selected_entry = 0;
6866 	s->repo = repo;
6867 
6868 	TAILQ_INIT(&s->refs);
6869 	STAILQ_INIT(&s->colors);
6870 
6871 	err = ref_view_load_refs(s);
6872 	if (err)
6873 		return err;
6874 
6875 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6876 		err = add_color(&s->colors, "^refs/heads/",
6877 		    TOG_COLOR_REFS_HEADS,
6878 		    get_color_value("TOG_COLOR_REFS_HEADS"));
6879 		if (err)
6880 			goto done;
6881 
6882 		err = add_color(&s->colors, "^refs/tags/",
6883 		    TOG_COLOR_REFS_TAGS,
6884 		    get_color_value("TOG_COLOR_REFS_TAGS"));
6885 		if (err)
6886 			goto done;
6887 
6888 		err = add_color(&s->colors, "^refs/remotes/",
6889 		    TOG_COLOR_REFS_REMOTES,
6890 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
6891 		if (err)
6892 			goto done;
6893 
6894 		err = add_color(&s->colors, "^refs/got/backup/",
6895 		    TOG_COLOR_REFS_BACKUP,
6896 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
6897 		if (err)
6898 			goto done;
6899 	}
6900 
6901 	view->show = show_ref_view;
6902 	view->input = input_ref_view;
6903 	view->close = close_ref_view;
6904 	view->search_start = search_start_ref_view;
6905 	view->search_next = search_next_ref_view;
6906 done:
6907 	if (err)
6908 		free_colors(&s->colors);
6909 	return err;
6910 }
6911 
6912 static const struct got_error *
6913 close_ref_view(struct tog_view *view)
6914 {
6915 	struct tog_ref_view_state *s = &view->state.ref;
6916 
6917 	ref_view_free_refs(s);
6918 	free_colors(&s->colors);
6919 
6920 	return NULL;
6921 }
6922 
6923 static const struct got_error *
6924 resolve_reflist_entry(struct got_object_id **commit_id,
6925     struct tog_reflist_entry *re, struct got_repository *repo)
6926 {
6927 	const struct got_error *err = NULL;
6928 	struct got_object_id *obj_id;
6929 	struct got_tag_object *tag = NULL;
6930 	int obj_type;
6931 
6932 	*commit_id = NULL;
6933 
6934 	err = got_ref_resolve(&obj_id, repo, re->ref);
6935 	if (err)
6936 		return err;
6937 
6938 	err = got_object_get_type(&obj_type, repo, obj_id);
6939 	if (err)
6940 		goto done;
6941 
6942 	switch (obj_type) {
6943 	case GOT_OBJ_TYPE_COMMIT:
6944 		*commit_id = obj_id;
6945 		break;
6946 	case GOT_OBJ_TYPE_TAG:
6947 		err = got_object_open_as_tag(&tag, repo, obj_id);
6948 		if (err)
6949 			goto done;
6950 		free(obj_id);
6951 		err = got_object_get_type(&obj_type, repo,
6952 		    got_object_tag_get_object_id(tag));
6953 		if (err)
6954 			goto done;
6955 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
6956 			err = got_error(GOT_ERR_OBJ_TYPE);
6957 			goto done;
6958 		}
6959 		*commit_id = got_object_id_dup(
6960 		    got_object_tag_get_object_id(tag));
6961 		if (*commit_id == NULL) {
6962 			err = got_error_from_errno("got_object_id_dup");
6963 			goto done;
6964 		}
6965 		break;
6966 	default:
6967 		err = got_error(GOT_ERR_OBJ_TYPE);
6968 		break;
6969 	}
6970 
6971 done:
6972 	if (tag)
6973 		got_object_tag_close(tag);
6974 	if (err) {
6975 		free(*commit_id);
6976 		*commit_id = NULL;
6977 	}
6978 	return err;
6979 }
6980 
6981 static const struct got_error *
6982 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
6983     struct tog_reflist_entry *re, struct got_repository *repo)
6984 {
6985 	struct tog_view *log_view;
6986 	const struct got_error *err = NULL;
6987 	struct got_object_id *commit_id = NULL;
6988 
6989 	*new_view = NULL;
6990 
6991 	err = resolve_reflist_entry(&commit_id, re, repo);
6992 	if (err) {
6993 		if (err->code != GOT_ERR_OBJ_TYPE)
6994 			return err;
6995 		else
6996 			return NULL;
6997 	}
6998 
6999 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7000 	if (log_view == NULL) {
7001 		err = got_error_from_errno("view_open");
7002 		goto done;
7003 	}
7004 
7005 	err = open_log_view(log_view, commit_id, repo,
7006 	    got_ref_get_name(re->ref), "", 0);
7007 done:
7008 	if (err)
7009 		view_close(log_view);
7010 	else
7011 		*new_view = log_view;
7012 	free(commit_id);
7013 	return err;
7014 }
7015 
7016 static void
7017 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7018 {
7019 	struct tog_reflist_entry *re;
7020 	int i = 0;
7021 
7022 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7023 		return;
7024 
7025 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7026 	while (i++ < maxscroll) {
7027 		if (re == NULL)
7028 			break;
7029 		s->first_displayed_entry = re;
7030 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7031 	}
7032 }
7033 
7034 static const struct got_error *
7035 ref_scroll_down(struct tog_view *view, int maxscroll)
7036 {
7037 	struct tog_ref_view_state *s = &view->state.ref;
7038 	struct tog_reflist_entry *next, *last;
7039 	int n = 0;
7040 
7041 	if (s->first_displayed_entry)
7042 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7043 	else
7044 		next = TAILQ_FIRST(&s->refs);
7045 
7046 	last = s->last_displayed_entry;
7047 	while (next && n++ < maxscroll) {
7048 		if (last)
7049 			last = TAILQ_NEXT(last, entry);
7050 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7051 			s->first_displayed_entry = next;
7052 			next = TAILQ_NEXT(next, entry);
7053 		}
7054 	}
7055 
7056 	return NULL;
7057 }
7058 
7059 static const struct got_error *
7060 search_start_ref_view(struct tog_view *view)
7061 {
7062 	struct tog_ref_view_state *s = &view->state.ref;
7063 
7064 	s->matched_entry = NULL;
7065 	return NULL;
7066 }
7067 
7068 static int
7069 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7070 {
7071 	regmatch_t regmatch;
7072 
7073 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7074 	    0) == 0;
7075 }
7076 
7077 static const struct got_error *
7078 search_next_ref_view(struct tog_view *view)
7079 {
7080 	struct tog_ref_view_state *s = &view->state.ref;
7081 	struct tog_reflist_entry *re = NULL;
7082 
7083 	if (!view->searching) {
7084 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7085 		return NULL;
7086 	}
7087 
7088 	if (s->matched_entry) {
7089 		if (view->searching == TOG_SEARCH_FORWARD) {
7090 			if (s->selected_entry)
7091 				re = TAILQ_NEXT(s->selected_entry, entry);
7092 			else
7093 				re = TAILQ_PREV(s->selected_entry,
7094 				    tog_reflist_head, entry);
7095 		} else {
7096 			if (s->selected_entry == NULL)
7097 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7098 			else
7099 				re = TAILQ_PREV(s->selected_entry,
7100 				    tog_reflist_head, entry);
7101 		}
7102 	} else {
7103 		if (s->selected_entry)
7104 			re = s->selected_entry;
7105 		else if (view->searching == TOG_SEARCH_FORWARD)
7106 			re = TAILQ_FIRST(&s->refs);
7107 		else
7108 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7109 	}
7110 
7111 	while (1) {
7112 		if (re == NULL) {
7113 			if (s->matched_entry == NULL) {
7114 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7115 				return NULL;
7116 			}
7117 			if (view->searching == TOG_SEARCH_FORWARD)
7118 				re = TAILQ_FIRST(&s->refs);
7119 			else
7120 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7121 		}
7122 
7123 		if (match_reflist_entry(re, &view->regex)) {
7124 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7125 			s->matched_entry = re;
7126 			break;
7127 		}
7128 
7129 		if (view->searching == TOG_SEARCH_FORWARD)
7130 			re = TAILQ_NEXT(re, entry);
7131 		else
7132 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7133 	}
7134 
7135 	if (s->matched_entry) {
7136 		s->first_displayed_entry = s->matched_entry;
7137 		s->selected = 0;
7138 	}
7139 
7140 	return NULL;
7141 }
7142 
7143 static const struct got_error *
7144 show_ref_view(struct tog_view *view)
7145 {
7146 	const struct got_error *err = NULL;
7147 	struct tog_ref_view_state *s = &view->state.ref;
7148 	struct tog_reflist_entry *re;
7149 	char *line = NULL;
7150 	wchar_t *wline;
7151 	struct tog_color *tc;
7152 	int width, n;
7153 	int limit = view->nlines;
7154 
7155 	werase(view->window);
7156 
7157 	s->ndisplayed = 0;
7158 	if (view_is_hsplit_top(view))
7159 		--limit;  /* border */
7160 
7161 	if (limit == 0)
7162 		return NULL;
7163 
7164 	re = s->first_displayed_entry;
7165 
7166 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7167 	    s->nrefs) == -1)
7168 		return got_error_from_errno("asprintf");
7169 
7170 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7171 	if (err) {
7172 		free(line);
7173 		return err;
7174 	}
7175 	if (view_needs_focus_indication(view))
7176 		wstandout(view->window);
7177 	waddwstr(view->window, wline);
7178 	if (view_needs_focus_indication(view))
7179 		wstandend(view->window);
7180 	free(wline);
7181 	wline = NULL;
7182 	free(line);
7183 	line = NULL;
7184 	if (width < view->ncols - 1)
7185 		waddch(view->window, '\n');
7186 	if (--limit <= 0)
7187 		return NULL;
7188 
7189 	n = 0;
7190 	while (re && limit > 0) {
7191 		char *line = NULL;
7192 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7193 
7194 		if (s->show_date) {
7195 			struct got_commit_object *ci;
7196 			struct got_tag_object *tag;
7197 			struct got_object_id *id;
7198 			struct tm tm;
7199 			time_t t;
7200 
7201 			err = got_ref_resolve(&id, s->repo, re->ref);
7202 			if (err)
7203 				return err;
7204 			err = got_object_open_as_tag(&tag, s->repo, id);
7205 			if (err) {
7206 				if (err->code != GOT_ERR_OBJ_TYPE) {
7207 					free(id);
7208 					return err;
7209 				}
7210 				err = got_object_open_as_commit(&ci, s->repo,
7211 				    id);
7212 				if (err) {
7213 					free(id);
7214 					return err;
7215 				}
7216 				t = got_object_commit_get_committer_time(ci);
7217 				got_object_commit_close(ci);
7218 			} else {
7219 				t = got_object_tag_get_tagger_time(tag);
7220 				got_object_tag_close(tag);
7221 			}
7222 			free(id);
7223 			if (gmtime_r(&t, &tm) == NULL)
7224 				return got_error_from_errno("gmtime_r");
7225 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7226 				return got_error(GOT_ERR_NO_SPACE);
7227 		}
7228 		if (got_ref_is_symbolic(re->ref)) {
7229 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7230 			    ymd : "", got_ref_get_name(re->ref),
7231 			    got_ref_get_symref_target(re->ref)) == -1)
7232 				return got_error_from_errno("asprintf");
7233 		} else if (s->show_ids) {
7234 			struct got_object_id *id;
7235 			char *id_str;
7236 			err = got_ref_resolve(&id, s->repo, re->ref);
7237 			if (err)
7238 				return err;
7239 			err = got_object_id_str(&id_str, id);
7240 			if (err) {
7241 				free(id);
7242 				return err;
7243 			}
7244 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7245 			    got_ref_get_name(re->ref), id_str) == -1) {
7246 				err = got_error_from_errno("asprintf");
7247 				free(id);
7248 				free(id_str);
7249 				return err;
7250 			}
7251 			free(id);
7252 			free(id_str);
7253 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7254 		    got_ref_get_name(re->ref)) == -1)
7255 			return got_error_from_errno("asprintf");
7256 
7257 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7258 		    0, 0);
7259 		if (err) {
7260 			free(line);
7261 			return err;
7262 		}
7263 		if (n == s->selected) {
7264 			if (view->focussed)
7265 				wstandout(view->window);
7266 			s->selected_entry = re;
7267 		}
7268 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7269 		if (tc)
7270 			wattr_on(view->window,
7271 			    COLOR_PAIR(tc->colorpair), NULL);
7272 		waddwstr(view->window, wline);
7273 		if (tc)
7274 			wattr_off(view->window,
7275 			    COLOR_PAIR(tc->colorpair), NULL);
7276 		if (width < view->ncols - 1)
7277 			waddch(view->window, '\n');
7278 		if (n == s->selected && view->focussed)
7279 			wstandend(view->window);
7280 		free(line);
7281 		free(wline);
7282 		wline = NULL;
7283 		n++;
7284 		s->ndisplayed++;
7285 		s->last_displayed_entry = re;
7286 
7287 		limit--;
7288 		re = TAILQ_NEXT(re, entry);
7289 	}
7290 
7291 	view_border(view);
7292 	return err;
7293 }
7294 
7295 static const struct got_error *
7296 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7297     struct tog_reflist_entry *re, struct got_repository *repo)
7298 {
7299 	const struct got_error *err = NULL;
7300 	struct got_object_id *commit_id = NULL;
7301 	struct tog_view *tree_view;
7302 
7303 	*new_view = NULL;
7304 
7305 	err = resolve_reflist_entry(&commit_id, re, repo);
7306 	if (err) {
7307 		if (err->code != GOT_ERR_OBJ_TYPE)
7308 			return err;
7309 		else
7310 			return NULL;
7311 	}
7312 
7313 
7314 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7315 	if (tree_view == NULL) {
7316 		err = got_error_from_errno("view_open");
7317 		goto done;
7318 	}
7319 
7320 	err = open_tree_view(tree_view, commit_id,
7321 	    got_ref_get_name(re->ref), repo);
7322 	if (err)
7323 		goto done;
7324 
7325 	*new_view = tree_view;
7326 done:
7327 	free(commit_id);
7328 	return err;
7329 }
7330 static const struct got_error *
7331 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7332 {
7333 	const struct got_error *err = NULL;
7334 	struct tog_ref_view_state *s = &view->state.ref;
7335 	struct tog_view *log_view, *tree_view;
7336 	struct tog_reflist_entry *re;
7337 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7338 
7339 	switch (ch) {
7340 	case 'i':
7341 		s->show_ids = !s->show_ids;
7342 		view->count = 0;
7343 		break;
7344 	case 'm':
7345 		s->show_date = !s->show_date;
7346 		view->count = 0;
7347 		break;
7348 	case 'o':
7349 		s->sort_by_date = !s->sort_by_date;
7350 		view->count = 0;
7351 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7352 		    got_ref_cmp_by_commit_timestamp_descending :
7353 		    tog_ref_cmp_by_name, s->repo);
7354 		if (err)
7355 			break;
7356 		got_reflist_object_id_map_free(tog_refs_idmap);
7357 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7358 		    &tog_refs, s->repo);
7359 		if (err)
7360 			break;
7361 		ref_view_free_refs(s);
7362 		err = ref_view_load_refs(s);
7363 		break;
7364 	case KEY_ENTER:
7365 	case '\r':
7366 		view->count = 0;
7367 		if (!s->selected_entry)
7368 			break;
7369 		if (view_is_parent_view(view))
7370 			view_get_split(view, &begin_y, &begin_x);
7371 
7372 		err = log_ref_entry(&log_view, begin_y, begin_x,
7373 		    s->selected_entry, s->repo);
7374 		if (err)
7375 			break;
7376 
7377 		if (view_is_parent_view(view) &&
7378 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7379 			err = view_init_hsplit(view, begin_y);
7380 			if (err)
7381 				break;
7382 		}
7383 
7384 		view->focussed = 0;
7385 		log_view->focussed = 1;
7386 		log_view->mode = view->mode;
7387 		log_view->nlines = view->lines - begin_y;
7388 		if (view_is_parent_view(view)) {
7389 			err = view_close_child(view);
7390 			if (err)
7391 				return err;
7392 			err = view_set_child(view, log_view);
7393 			if (err)
7394 				return err;
7395 			view->focus_child = 1;
7396 		} else
7397 			*new_view = log_view;
7398 		break;
7399 	case 't':
7400 		view->count = 0;
7401 		if (!s->selected_entry)
7402 			break;
7403 		if (view_is_parent_view(view))
7404 			view_get_split(view, &begin_y, &begin_x);
7405 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7406 		    s->selected_entry, s->repo);
7407 		if (err || tree_view == NULL)
7408 			break;
7409 		if (view_is_parent_view(view) &&
7410 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7411 			err = view_init_hsplit(view, begin_y);
7412 			if (err)
7413 				break;
7414 		}
7415 		view->focussed = 0;
7416 		tree_view->focussed = 1;
7417 		tree_view->mode = view->mode;
7418 		tree_view->nlines = view->lines - begin_y;
7419 		if (view_is_parent_view(view)) {
7420 			err = view_close_child(view);
7421 			if (err)
7422 				return err;
7423 			err = view_set_child(view, tree_view);
7424 			if (err)
7425 				return err;
7426 			view->focus_child = 1;
7427 		} else
7428 			*new_view = tree_view;
7429 		break;
7430 	case 'g':
7431 	case KEY_HOME:
7432 		s->selected = 0;
7433 		view->count = 0;
7434 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7435 		break;
7436 	case 'G':
7437 	case KEY_END: {
7438 		int eos = view->nlines - 1;
7439 
7440 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7441 			--eos;  /* border */
7442 		s->selected = 0;
7443 		view->count = 0;
7444 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7445 		for (n = 0; n < eos; n++) {
7446 			if (re == NULL)
7447 				break;
7448 			s->first_displayed_entry = re;
7449 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7450 		}
7451 		if (n > 0)
7452 			s->selected = n - 1;
7453 		break;
7454 	}
7455 	case 'k':
7456 	case KEY_UP:
7457 	case CTRL('p'):
7458 		if (s->selected > 0) {
7459 			s->selected--;
7460 			break;
7461 		}
7462 		ref_scroll_up(s, 1);
7463 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7464 			view->count = 0;
7465 		break;
7466 	case CTRL('u'):
7467 	case 'u':
7468 		nscroll /= 2;
7469 		/* FALL THROUGH */
7470 	case KEY_PPAGE:
7471 	case CTRL('b'):
7472 	case 'b':
7473 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7474 			s->selected -= MIN(nscroll, s->selected);
7475 		ref_scroll_up(s, MAX(0, nscroll));
7476 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7477 			view->count = 0;
7478 		break;
7479 	case 'j':
7480 	case KEY_DOWN:
7481 	case CTRL('n'):
7482 		if (s->selected < s->ndisplayed - 1) {
7483 			s->selected++;
7484 			break;
7485 		}
7486 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7487 			/* can't scroll any further */
7488 			view->count = 0;
7489 			break;
7490 		}
7491 		ref_scroll_down(view, 1);
7492 		break;
7493 	case CTRL('d'):
7494 	case 'd':
7495 		nscroll /= 2;
7496 		/* FALL THROUGH */
7497 	case KEY_NPAGE:
7498 	case CTRL('f'):
7499 	case 'f':
7500 	case ' ':
7501 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7502 			/* can't scroll any further; move cursor down */
7503 			if (s->selected < s->ndisplayed - 1)
7504 				s->selected += MIN(nscroll,
7505 				    s->ndisplayed - s->selected - 1);
7506 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7507 				s->selected += s->ndisplayed - s->selected - 1;
7508 			view->count = 0;
7509 			break;
7510 		}
7511 		ref_scroll_down(view, nscroll);
7512 		break;
7513 	case CTRL('l'):
7514 		view->count = 0;
7515 		tog_free_refs();
7516 		err = tog_load_refs(s->repo, s->sort_by_date);
7517 		if (err)
7518 			break;
7519 		ref_view_free_refs(s);
7520 		err = ref_view_load_refs(s);
7521 		break;
7522 	case KEY_RESIZE:
7523 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7524 			s->selected = view->nlines - 2;
7525 		break;
7526 	default:
7527 		view->count = 0;
7528 		break;
7529 	}
7530 
7531 	return err;
7532 }
7533 
7534 __dead static void
7535 usage_ref(void)
7536 {
7537 	endwin();
7538 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7539 	    getprogname());
7540 	exit(1);
7541 }
7542 
7543 static const struct got_error *
7544 cmd_ref(int argc, char *argv[])
7545 {
7546 	const struct got_error *error;
7547 	struct got_repository *repo = NULL;
7548 	struct got_worktree *worktree = NULL;
7549 	char *cwd = NULL, *repo_path = NULL;
7550 	int ch;
7551 	struct tog_view *view;
7552 	int *pack_fds = NULL;
7553 
7554 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7555 		switch (ch) {
7556 		case 'r':
7557 			repo_path = realpath(optarg, NULL);
7558 			if (repo_path == NULL)
7559 				return got_error_from_errno2("realpath",
7560 				    optarg);
7561 			break;
7562 		default:
7563 			usage_ref();
7564 			/* NOTREACHED */
7565 		}
7566 	}
7567 
7568 	argc -= optind;
7569 	argv += optind;
7570 
7571 	if (argc > 1)
7572 		usage_ref();
7573 
7574 	error = got_repo_pack_fds_open(&pack_fds);
7575 	if (error != NULL)
7576 		goto done;
7577 
7578 	if (repo_path == NULL) {
7579 		cwd = getcwd(NULL, 0);
7580 		if (cwd == NULL)
7581 			return got_error_from_errno("getcwd");
7582 		error = got_worktree_open(&worktree, cwd);
7583 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7584 			goto done;
7585 		if (worktree)
7586 			repo_path =
7587 			    strdup(got_worktree_get_repo_path(worktree));
7588 		else
7589 			repo_path = strdup(cwd);
7590 		if (repo_path == NULL) {
7591 			error = got_error_from_errno("strdup");
7592 			goto done;
7593 		}
7594 	}
7595 
7596 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7597 	if (error != NULL)
7598 		goto done;
7599 
7600 	init_curses();
7601 
7602 	error = apply_unveil(got_repo_get_path(repo), NULL);
7603 	if (error)
7604 		goto done;
7605 
7606 	error = tog_load_refs(repo, 0);
7607 	if (error)
7608 		goto done;
7609 
7610 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7611 	if (view == NULL) {
7612 		error = got_error_from_errno("view_open");
7613 		goto done;
7614 	}
7615 
7616 	error = open_ref_view(view, repo);
7617 	if (error)
7618 		goto done;
7619 
7620 	if (worktree) {
7621 		/* Release work tree lock. */
7622 		got_worktree_close(worktree);
7623 		worktree = NULL;
7624 	}
7625 	error = view_loop(view);
7626 done:
7627 	free(repo_path);
7628 	free(cwd);
7629 	if (repo) {
7630 		const struct got_error *close_err = got_repo_close(repo);
7631 		if (close_err)
7632 			error = close_err;
7633 	}
7634 	if (pack_fds) {
7635 		const struct got_error *pack_err =
7636 		    got_repo_pack_fds_close(pack_fds);
7637 		if (error == NULL)
7638 			error = pack_err;
7639 	}
7640 	tog_free_refs();
7641 	return error;
7642 }
7643 
7644 /*
7645  * If view was scrolled down to move the selected line into view when opening a
7646  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7647  */
7648 static void
7649 offset_selection_up(struct tog_view *view)
7650 {
7651 	switch (view->type) {
7652 	case TOG_VIEW_BLAME: {
7653 		struct tog_blame_view_state *s = &view->state.blame;
7654 		if (s->first_displayed_line == 1) {
7655 			s->selected_line = MAX(s->selected_line - view->offset,
7656 			    1);
7657 			break;
7658 		}
7659 		if (s->first_displayed_line > view->offset)
7660 			s->first_displayed_line -= view->offset;
7661 		else
7662 			s->first_displayed_line = 1;
7663 		s->selected_line += view->offset;
7664 		break;
7665 	}
7666 	case TOG_VIEW_LOG:
7667 		log_scroll_up(&view->state.log, view->offset);
7668 		view->state.log.selected += view->offset;
7669 		break;
7670 	case TOG_VIEW_REF:
7671 		ref_scroll_up(&view->state.ref, view->offset);
7672 		view->state.ref.selected += view->offset;
7673 		break;
7674 	case TOG_VIEW_TREE:
7675 		tree_scroll_up(&view->state.tree, view->offset);
7676 		view->state.tree.selected += view->offset;
7677 		break;
7678 	default:
7679 		break;
7680 	}
7681 
7682 	view->offset = 0;
7683 }
7684 
7685 /*
7686  * If the selected line is in the section of screen covered by the bottom split,
7687  * scroll down offset lines to move it into view and index its new position.
7688  */
7689 static const struct got_error *
7690 offset_selection_down(struct tog_view *view)
7691 {
7692 	const struct got_error	*err = NULL;
7693 	const struct got_error	*(*scrolld)(struct tog_view *, int);
7694 	int			*selected = NULL;
7695 	int			 header, offset;
7696 
7697 	switch (view->type) {
7698 	case TOG_VIEW_BLAME: {
7699 		struct tog_blame_view_state *s = &view->state.blame;
7700 		header = 3;
7701 		scrolld = NULL;
7702 		if (s->selected_line > view->nlines - header) {
7703 			offset = abs(view->nlines - s->selected_line - header);
7704 			s->first_displayed_line += offset;
7705 			s->selected_line -= offset;
7706 			view->offset = offset;
7707 		}
7708 		break;
7709 	}
7710 	case TOG_VIEW_LOG: {
7711 		struct tog_log_view_state *s = &view->state.log;
7712 		scrolld = &log_scroll_down;
7713 		header = 3;
7714 		selected = &s->selected;
7715 		break;
7716 	}
7717 	case TOG_VIEW_REF: {
7718 		struct tog_ref_view_state *s = &view->state.ref;
7719 		scrolld = &ref_scroll_down;
7720 		header = 3;
7721 		selected = &s->selected;
7722 		break;
7723 	}
7724 	case TOG_VIEW_TREE: {
7725 		struct tog_tree_view_state *s = &view->state.tree;
7726 		scrolld = &tree_scroll_down;
7727 		header = 5;
7728 		selected = &s->selected;
7729 		break;
7730 	}
7731 	default:
7732 		selected = NULL;
7733 		scrolld = NULL;
7734 		header = 0;
7735 		break;
7736 	}
7737 
7738 	if (selected && *selected > view->nlines - header) {
7739 		offset = abs(view->nlines - *selected - header);
7740 		view->offset = offset;
7741 		if (scrolld && offset) {
7742 			err = scrolld(view, offset);
7743 			*selected -= offset;
7744 		}
7745 	}
7746 
7747 	return err;
7748 }
7749 
7750 static void
7751 list_commands(FILE *fp)
7752 {
7753 	size_t i;
7754 
7755 	fprintf(fp, "commands:");
7756 	for (i = 0; i < nitems(tog_commands); i++) {
7757 		const struct tog_cmd *cmd = &tog_commands[i];
7758 		fprintf(fp, " %s", cmd->name);
7759 	}
7760 	fputc('\n', fp);
7761 }
7762 
7763 __dead static void
7764 usage(int hflag, int status)
7765 {
7766 	FILE *fp = (status == 0) ? stdout : stderr;
7767 
7768 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
7769 	    getprogname());
7770 	if (hflag) {
7771 		fprintf(fp, "lazy usage: %s path\n", getprogname());
7772 		list_commands(fp);
7773 	}
7774 	exit(status);
7775 }
7776 
7777 static char **
7778 make_argv(int argc, ...)
7779 {
7780 	va_list ap;
7781 	char **argv;
7782 	int i;
7783 
7784 	va_start(ap, argc);
7785 
7786 	argv = calloc(argc, sizeof(char *));
7787 	if (argv == NULL)
7788 		err(1, "calloc");
7789 	for (i = 0; i < argc; i++) {
7790 		argv[i] = strdup(va_arg(ap, char *));
7791 		if (argv[i] == NULL)
7792 			err(1, "strdup");
7793 	}
7794 
7795 	va_end(ap);
7796 	return argv;
7797 }
7798 
7799 /*
7800  * Try to convert 'tog path' into a 'tog log path' command.
7801  * The user could simply have mistyped the command rather than knowingly
7802  * provided a path. So check whether argv[0] can in fact be resolved
7803  * to a path in the HEAD commit and print a special error if not.
7804  * This hack is for mpi@ <3
7805  */
7806 static const struct got_error *
7807 tog_log_with_path(int argc, char *argv[])
7808 {
7809 	const struct got_error *error = NULL, *close_err;
7810 	const struct tog_cmd *cmd = NULL;
7811 	struct got_repository *repo = NULL;
7812 	struct got_worktree *worktree = NULL;
7813 	struct got_object_id *commit_id = NULL, *id = NULL;
7814 	struct got_commit_object *commit = NULL;
7815 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7816 	char *commit_id_str = NULL, **cmd_argv = NULL;
7817 	int *pack_fds = NULL;
7818 
7819 	cwd = getcwd(NULL, 0);
7820 	if (cwd == NULL)
7821 		return got_error_from_errno("getcwd");
7822 
7823 	error = got_repo_pack_fds_open(&pack_fds);
7824 	if (error != NULL)
7825 		goto done;
7826 
7827 	error = got_worktree_open(&worktree, cwd);
7828 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
7829 		goto done;
7830 
7831 	if (worktree)
7832 		repo_path = strdup(got_worktree_get_repo_path(worktree));
7833 	else
7834 		repo_path = strdup(cwd);
7835 	if (repo_path == NULL) {
7836 		error = got_error_from_errno("strdup");
7837 		goto done;
7838 	}
7839 
7840 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7841 	if (error != NULL)
7842 		goto done;
7843 
7844 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7845 	    repo, worktree);
7846 	if (error)
7847 		goto done;
7848 
7849 	error = tog_load_refs(repo, 0);
7850 	if (error)
7851 		goto done;
7852 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
7853 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
7854 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7855 	if (error)
7856 		goto done;
7857 
7858 	if (worktree) {
7859 		got_worktree_close(worktree);
7860 		worktree = NULL;
7861 	}
7862 
7863 	error = got_object_open_as_commit(&commit, repo, commit_id);
7864 	if (error)
7865 		goto done;
7866 
7867 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
7868 	if (error) {
7869 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
7870 			goto done;
7871 		fprintf(stderr, "%s: '%s' is no known command or path\n",
7872 		    getprogname(), argv[0]);
7873 		usage(1, 1);
7874 		/* not reached */
7875 	}
7876 
7877 	close_err = got_repo_close(repo);
7878 	if (error == NULL)
7879 		error = close_err;
7880 	repo = NULL;
7881 
7882 	error = got_object_id_str(&commit_id_str, commit_id);
7883 	if (error)
7884 		goto done;
7885 
7886 	cmd = &tog_commands[0]; /* log */
7887 	argc = 4;
7888 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
7889 	error = cmd->cmd_main(argc, cmd_argv);
7890 done:
7891 	if (repo) {
7892 		close_err = got_repo_close(repo);
7893 		if (error == NULL)
7894 			error = close_err;
7895 	}
7896 	if (commit)
7897 		got_object_commit_close(commit);
7898 	if (worktree)
7899 		got_worktree_close(worktree);
7900 	if (pack_fds) {
7901 		const struct got_error *pack_err =
7902 		    got_repo_pack_fds_close(pack_fds);
7903 		if (error == NULL)
7904 			error = pack_err;
7905 	}
7906 	free(id);
7907 	free(commit_id_str);
7908 	free(commit_id);
7909 	free(cwd);
7910 	free(repo_path);
7911 	free(in_repo_path);
7912 	if (cmd_argv) {
7913 		int i;
7914 		for (i = 0; i < argc; i++)
7915 			free(cmd_argv[i]);
7916 		free(cmd_argv);
7917 	}
7918 	tog_free_refs();
7919 	return error;
7920 }
7921 
7922 int
7923 main(int argc, char *argv[])
7924 {
7925 	const struct got_error *error = NULL;
7926 	const struct tog_cmd *cmd = NULL;
7927 	int ch, hflag = 0, Vflag = 0;
7928 	char **cmd_argv = NULL;
7929 	static const struct option longopts[] = {
7930 	    { "version", no_argument, NULL, 'V' },
7931 	    { NULL, 0, NULL, 0}
7932 	};
7933 	char *diff_algo_str = NULL;
7934 
7935 	setlocale(LC_CTYPE, "");
7936 
7937 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
7938 		switch (ch) {
7939 		case 'h':
7940 			hflag = 1;
7941 			break;
7942 		case 'V':
7943 			Vflag = 1;
7944 			break;
7945 		default:
7946 			usage(hflag, 1);
7947 			/* NOTREACHED */
7948 		}
7949 	}
7950 
7951 	argc -= optind;
7952 	argv += optind;
7953 	optind = 1;
7954 	optreset = 1;
7955 
7956 	if (Vflag) {
7957 		got_version_print_str();
7958 		return 0;
7959 	}
7960 
7961 #ifndef PROFILE
7962 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
7963 	    NULL) == -1)
7964 		err(1, "pledge");
7965 #endif
7966 
7967 	if (argc == 0) {
7968 		if (hflag)
7969 			usage(hflag, 0);
7970 		/* Build an argument vector which runs a default command. */
7971 		cmd = &tog_commands[0];
7972 		argc = 1;
7973 		cmd_argv = make_argv(argc, cmd->name);
7974 	} else {
7975 		size_t i;
7976 
7977 		/* Did the user specify a command? */
7978 		for (i = 0; i < nitems(tog_commands); i++) {
7979 			if (strncmp(tog_commands[i].name, argv[0],
7980 			    strlen(argv[0])) == 0) {
7981 				cmd = &tog_commands[i];
7982 				break;
7983 			}
7984 		}
7985 	}
7986 
7987 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
7988 	if (diff_algo_str) {
7989 		if (strcasecmp(diff_algo_str, "patience") == 0)
7990 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
7991 		if (strcasecmp(diff_algo_str, "myers") == 0)
7992 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
7993 	}
7994 
7995 	if (cmd == NULL) {
7996 		if (argc != 1)
7997 			usage(0, 1);
7998 		/* No command specified; try log with a path */
7999 		error = tog_log_with_path(argc, argv);
8000 	} else {
8001 		if (hflag)
8002 			cmd->cmd_usage();
8003 		else
8004 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8005 	}
8006 
8007 	endwin();
8008 	putchar('\n');
8009 	if (cmd_argv) {
8010 		int i;
8011 		for (i = 0; i < argc; i++)
8012 			free(cmd_argv[i]);
8013 		free(cmd_argv);
8014 	}
8015 
8016 	if (error && error->code != GOT_ERR_CANCELLED)
8017 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8018 	return 0;
8019 }