1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 	TOG_VIEW_HELP
112 };
113 
114 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
115 enum tog_keymap_type {
116 	TOG_KEYMAP_KEYS = -2,
117 	TOG_KEYMAP_GLOBAL,
118 	TOG_KEYMAP_DIFF,
119 	TOG_KEYMAP_LOG,
120 	TOG_KEYMAP_BLAME,
121 	TOG_KEYMAP_TREE,
122 	TOG_KEYMAP_REF,
123 	TOG_KEYMAP_HELP
124 };
125 
126 enum tog_view_mode {
127 	TOG_VIEW_SPLIT_NONE,
128 	TOG_VIEW_SPLIT_VERT,
129 	TOG_VIEW_SPLIT_HRZN
130 };
131 
132 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
133 
134 #define TOG_EOF_STRING	"(END)"
135 
136 struct commit_queue_entry {
137 	TAILQ_ENTRY(commit_queue_entry) entry;
138 	struct got_object_id *id;
139 	struct got_commit_object *commit;
140 	int idx;
141 };
142 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
143 struct commit_queue {
144 	int ncommits;
145 	struct commit_queue_head head;
146 };
147 
148 struct tog_color {
149 	STAILQ_ENTRY(tog_color) entry;
150 	regex_t regex;
151 	short colorpair;
152 };
153 STAILQ_HEAD(tog_colors, tog_color);
154 
155 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
156 static struct got_reflist_object_id_map *tog_refs_idmap;
157 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
158 
159 static const struct got_error *
160 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
161     struct got_reference* re2)
162 {
163 	const char *name1 = got_ref_get_name(re1);
164 	const char *name2 = got_ref_get_name(re2);
165 	int isbackup1, isbackup2;
166 
167 	/* Sort backup refs towards the bottom of the list. */
168 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
169 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
170 	if (!isbackup1 && isbackup2) {
171 		*cmp = -1;
172 		return NULL;
173 	} else if (isbackup1 && !isbackup2) {
174 		*cmp = 1;
175 		return NULL;
176 	}
177 
178 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
179 	return NULL;
180 }
181 
182 static const struct got_error *
183 tog_load_refs(struct got_repository *repo, int sort_by_date)
184 {
185 	const struct got_error *err;
186 
187 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
188 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
189 	    repo);
190 	if (err)
191 		return err;
192 
193 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
194 	    repo);
195 }
196 
197 static void
198 tog_free_refs(void)
199 {
200 	if (tog_refs_idmap) {
201 		got_reflist_object_id_map_free(tog_refs_idmap);
202 		tog_refs_idmap = NULL;
203 	}
204 	got_ref_list_free(&tog_refs);
205 }
206 
207 static const struct got_error *
208 add_color(struct tog_colors *colors, const char *pattern,
209     int idx, short color)
210 {
211 	const struct got_error *err = NULL;
212 	struct tog_color *tc;
213 	int regerr = 0;
214 
215 	if (idx < 1 || idx > COLOR_PAIRS - 1)
216 		return NULL;
217 
218 	init_pair(idx, color, -1);
219 
220 	tc = calloc(1, sizeof(*tc));
221 	if (tc == NULL)
222 		return got_error_from_errno("calloc");
223 	regerr = regcomp(&tc->regex, pattern,
224 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
225 	if (regerr) {
226 		static char regerr_msg[512];
227 		static char err_msg[512];
228 		regerror(regerr, &tc->regex, regerr_msg,
229 		    sizeof(regerr_msg));
230 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
231 		    regerr_msg);
232 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
233 		free(tc);
234 		return err;
235 	}
236 	tc->colorpair = idx;
237 	STAILQ_INSERT_HEAD(colors, tc, entry);
238 	return NULL;
239 }
240 
241 static void
242 free_colors(struct tog_colors *colors)
243 {
244 	struct tog_color *tc;
245 
246 	while (!STAILQ_EMPTY(colors)) {
247 		tc = STAILQ_FIRST(colors);
248 		STAILQ_REMOVE_HEAD(colors, entry);
249 		regfree(&tc->regex);
250 		free(tc);
251 	}
252 }
253 
254 static struct tog_color *
255 get_color(struct tog_colors *colors, int colorpair)
256 {
257 	struct tog_color *tc = NULL;
258 
259 	STAILQ_FOREACH(tc, colors, entry) {
260 		if (tc->colorpair == colorpair)
261 			return tc;
262 	}
263 
264 	return NULL;
265 }
266 
267 static int
268 default_color_value(const char *envvar)
269 {
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
271 		return COLOR_MAGENTA;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
273 		return COLOR_CYAN;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
275 		return COLOR_YELLOW;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
277 		return COLOR_GREEN;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
279 		return COLOR_MAGENTA;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
283 		return COLOR_CYAN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
285 		return COLOR_GREEN;
286 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
291 		return COLOR_YELLOW;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
295 		return COLOR_MAGENTA;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
299 		return COLOR_CYAN;
300 
301 	return -1;
302 }
303 
304 static int
305 get_color_value(const char *envvar)
306 {
307 	const char *val = getenv(envvar);
308 
309 	if (val == NULL)
310 		return default_color_value(envvar);
311 
312 	if (strcasecmp(val, "black") == 0)
313 		return COLOR_BLACK;
314 	if (strcasecmp(val, "red") == 0)
315 		return COLOR_RED;
316 	if (strcasecmp(val, "green") == 0)
317 		return COLOR_GREEN;
318 	if (strcasecmp(val, "yellow") == 0)
319 		return COLOR_YELLOW;
320 	if (strcasecmp(val, "blue") == 0)
321 		return COLOR_BLUE;
322 	if (strcasecmp(val, "magenta") == 0)
323 		return COLOR_MAGENTA;
324 	if (strcasecmp(val, "cyan") == 0)
325 		return COLOR_CYAN;
326 	if (strcasecmp(val, "white") == 0)
327 		return COLOR_WHITE;
328 	if (strcasecmp(val, "default") == 0)
329 		return -1;
330 
331 	return default_color_value(envvar);
332 }
333 
334 struct tog_diff_view_state {
335 	struct got_object_id *id1, *id2;
336 	const char *label1, *label2;
337 	FILE *f, *f1, *f2;
338 	int fd1, fd2;
339 	int lineno;
340 	int first_displayed_line;
341 	int last_displayed_line;
342 	int eof;
343 	int diff_context;
344 	int ignore_whitespace;
345 	int force_text_diff;
346 	struct got_repository *repo;
347 	struct got_diff_line *lines;
348 	size_t nlines;
349 	int matched_line;
350 	int selected_line;
351 
352 	/* passed from log or blame view; may be NULL */
353 	struct tog_view *parent_view;
354 };
355 
356 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
357 static volatile sig_atomic_t tog_thread_error;
358 
359 struct tog_log_thread_args {
360 	pthread_cond_t need_commits;
361 	pthread_cond_t commit_loaded;
362 	int commits_needed;
363 	int load_all;
364 	struct got_commit_graph *graph;
365 	struct commit_queue *real_commits;
366 	const char *in_repo_path;
367 	struct got_object_id *start_id;
368 	struct got_repository *repo;
369 	int *pack_fds;
370 	int log_complete;
371 	sig_atomic_t *quit;
372 	struct commit_queue_entry **first_displayed_entry;
373 	struct commit_queue_entry **selected_entry;
374 	int *searching;
375 	int *search_next_done;
376 	regex_t *regex;
377 	int *limiting;
378 	int limit_match;
379 	regex_t *limit_regex;
380 	struct commit_queue *limit_commits;
381 };
382 
383 struct tog_log_view_state {
384 	struct commit_queue *commits;
385 	struct commit_queue_entry *first_displayed_entry;
386 	struct commit_queue_entry *last_displayed_entry;
387 	struct commit_queue_entry *selected_entry;
388 	struct commit_queue real_commits;
389 	int selected;
390 	char *in_repo_path;
391 	char *head_ref_name;
392 	int log_branches;
393 	struct got_repository *repo;
394 	struct got_object_id *start_id;
395 	sig_atomic_t quit;
396 	pthread_t thread;
397 	struct tog_log_thread_args thread_args;
398 	struct commit_queue_entry *matched_entry;
399 	struct commit_queue_entry *search_entry;
400 	struct tog_colors colors;
401 	int use_committer;
402 	int limit_view;
403 	regex_t limit_regex;
404 	struct commit_queue limit_commits;
405 };
406 
407 #define TOG_COLOR_DIFF_MINUS		1
408 #define TOG_COLOR_DIFF_PLUS		2
409 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
410 #define TOG_COLOR_DIFF_META		4
411 #define TOG_COLOR_TREE_SUBMODULE	5
412 #define TOG_COLOR_TREE_SYMLINK		6
413 #define TOG_COLOR_TREE_DIRECTORY	7
414 #define TOG_COLOR_TREE_EXECUTABLE	8
415 #define TOG_COLOR_COMMIT		9
416 #define TOG_COLOR_AUTHOR		10
417 #define TOG_COLOR_DATE			11
418 #define TOG_COLOR_REFS_HEADS		12
419 #define TOG_COLOR_REFS_TAGS		13
420 #define TOG_COLOR_REFS_REMOTES		14
421 #define TOG_COLOR_REFS_BACKUP		15
422 
423 struct tog_blame_cb_args {
424 	struct tog_blame_line *lines; /* one per line */
425 	int nlines;
426 
427 	struct tog_view *view;
428 	struct got_object_id *commit_id;
429 	int *quit;
430 };
431 
432 struct tog_blame_thread_args {
433 	const char *path;
434 	struct got_repository *repo;
435 	struct tog_blame_cb_args *cb_args;
436 	int *complete;
437 	got_cancel_cb cancel_cb;
438 	void *cancel_arg;
439 };
440 
441 struct tog_blame {
442 	FILE *f;
443 	off_t filesize;
444 	struct tog_blame_line *lines;
445 	int nlines;
446 	off_t *line_offsets;
447 	pthread_t thread;
448 	struct tog_blame_thread_args thread_args;
449 	struct tog_blame_cb_args cb_args;
450 	const char *path;
451 	int *pack_fds;
452 };
453 
454 struct tog_blame_view_state {
455 	int first_displayed_line;
456 	int last_displayed_line;
457 	int selected_line;
458 	int last_diffed_line;
459 	int blame_complete;
460 	int eof;
461 	int done;
462 	struct got_object_id_queue blamed_commits;
463 	struct got_object_qid *blamed_commit;
464 	char *path;
465 	struct got_repository *repo;
466 	struct got_object_id *commit_id;
467 	struct got_object_id *id_to_log;
468 	struct tog_blame blame;
469 	int matched_line;
470 	struct tog_colors colors;
471 };
472 
473 struct tog_parent_tree {
474 	TAILQ_ENTRY(tog_parent_tree) entry;
475 	struct got_tree_object *tree;
476 	struct got_tree_entry *first_displayed_entry;
477 	struct got_tree_entry *selected_entry;
478 	int selected;
479 };
480 
481 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
482 
483 struct tog_tree_view_state {
484 	char *tree_label;
485 	struct got_object_id *commit_id;/* commit which this tree belongs to */
486 	struct got_tree_object *root;	/* the commit's root tree entry */
487 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
488 	struct got_tree_entry *first_displayed_entry;
489 	struct got_tree_entry *last_displayed_entry;
490 	struct got_tree_entry *selected_entry;
491 	int ndisplayed, selected, show_ids;
492 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
493 	char *head_ref_name;
494 	struct got_repository *repo;
495 	struct got_tree_entry *matched_entry;
496 	struct tog_colors colors;
497 };
498 
499 struct tog_reflist_entry {
500 	TAILQ_ENTRY(tog_reflist_entry) entry;
501 	struct got_reference *ref;
502 	int idx;
503 };
504 
505 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
506 
507 struct tog_ref_view_state {
508 	struct tog_reflist_head refs;
509 	struct tog_reflist_entry *first_displayed_entry;
510 	struct tog_reflist_entry *last_displayed_entry;
511 	struct tog_reflist_entry *selected_entry;
512 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
513 	struct got_repository *repo;
514 	struct tog_reflist_entry *matched_entry;
515 	struct tog_colors colors;
516 };
517 
518 struct tog_help_view_state {
519 	FILE			*f;
520 	off_t			*line_offsets;
521 	size_t			 nlines;
522 	int			 lineno;
523 	int			 first_displayed_line;
524 	int			 last_displayed_line;
525 	int			 eof;
526 	int			 matched_line;
527 	int			 selected_line;
528 	int			 all;
529 	enum tog_keymap_type	 type;
530 };
531 
532 #define GENERATE_HELP \
533 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
534 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
535 	KEY_("k C-p Up", "Move cursor or page up one line"), \
536 	KEY_("j C-n Down", "Move cursor or page down one line"), \
537 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
538 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
539 	KEY_("C-u u", "Scroll the view up one half page"), \
540 	KEY_("C-d d", "Scroll the view down one half page"), \
541 	KEY_("g", "Go to line N (default: first line)"), \
542 	KEY_("Home =", "Go to the first line"), \
543 	KEY_("G", "Go to line N (default: last line)"), \
544 	KEY_("End *", "Go to the last line"), \
545 	KEY_("l Right", "Scroll the view right"), \
546 	KEY_("h Left", "Scroll the view left"), \
547 	KEY_("$", "Scroll view to the rightmost position"), \
548 	KEY_("0", "Scroll view to the leftmost position"), \
549 	KEY_("-", "Decrease size of the focussed split"), \
550 	KEY_("+", "Increase size of the focussed split"), \
551 	KEY_("Tab", "Switch focus between views"), \
552 	KEY_("F", "Toggle fullscreen mode"), \
553 	KEY_("/", "Open prompt to enter search term"), \
554 	KEY_("n", "Find next line/token matching the current search term"), \
555 	KEY_("N", "Find previous line/token matching the current search term"),\
556 	KEY_("q", "Quit the focussed view; Quit help screen"), \
557 	KEY_("Q", "Quit tog"), \
558 	\
559 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
560 	KEY_("< ,", "Move cursor up one commit"), \
561 	KEY_("> .", "Move cursor down one commit"), \
562 	KEY_("Enter", "Open diff view of the selected commit"), \
563 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
564 	KEY_("R", "Open ref view of all repository references"), \
565 	KEY_("T", "Display tree view of the repository from the selected" \
566 	    " commit"), \
567 	KEY_("@", "Toggle between displaying author and committer name"), \
568 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
569 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
570 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
571 	\
572 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
573 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
574 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
575 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
576 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
577 	    " data"), \
578 	KEY_("(", "Go to the previous file in the diff"), \
579 	KEY_(")", "Go to the next file in the diff"), \
580 	KEY_("{", "Go to the previous hunk in the diff"), \
581 	KEY_("}", "Go to the next hunk in the diff"), \
582 	KEY_("[", "Decrease the number of context lines"), \
583 	KEY_("]", "Increase the number of context lines"), \
584 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
585 	\
586 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
587 	KEY_("Enter", "Display diff view of the selected line's commit"), \
588 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
589 	KEY_("L", "Open log view for the currently selected annotated line"), \
590 	KEY_("C", "Reload view with the previously blamed commit"), \
591 	KEY_("c", "Reload view with the version of the file found in the" \
592 	    " selected line's commit"), \
593 	KEY_("p", "Reload view with the version of the file found in the" \
594 	    " selected line's parent commit"), \
595 	\
596 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
597 	KEY_("Enter", "Enter selected directory or open blame view of the" \
598 	    " selected file"), \
599 	KEY_("L", "Open log view for the selected entry"), \
600 	KEY_("R", "Open ref view of all repository references"), \
601 	KEY_("i", "Show object IDs for all tree entries"), \
602 	KEY_("Backspace", "Return to the parent directory"), \
603 	\
604 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
605 	KEY_("Enter", "Display log view of the selected reference"), \
606 	KEY_("T", "Display tree view of the selected reference"), \
607 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
608 	KEY_("m", "Toggle display of last modified date for each reference"), \
609 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
610 	KEY_("C-l", "Reload view with all repository references")
611 
612 struct tog_key_map {
613 	const char		*keys;
614 	const char		*info;
615 	enum tog_keymap_type	 type;
616 };
617 
618 /*
619  * We implement two types of views: parent views and child views.
620  *
621  * The 'Tab' key switches focus between a parent view and its child view.
622  * Child views are shown side-by-side to their parent view, provided
623  * there is enough screen estate.
624  *
625  * When a new view is opened from within a parent view, this new view
626  * becomes a child view of the parent view, replacing any existing child.
627  *
628  * When a new view is opened from within a child view, this new view
629  * becomes a parent view which will obscure the views below until the
630  * user quits the new parent view by typing 'q'.
631  *
632  * This list of views contains parent views only.
633  * Child views are only pointed to by their parent view.
634  */
635 TAILQ_HEAD(tog_view_list_head, tog_view);
636 
637 struct tog_view {
638 	TAILQ_ENTRY(tog_view) entry;
639 	WINDOW *window;
640 	PANEL *panel;
641 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
642 	int resized_y, resized_x; /* begin_y/x based on user resizing */
643 	int maxx, x; /* max column and current start column */
644 	int lines, cols; /* copies of LINES and COLS */
645 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
646 	int gline, hiline; /* navigate to and highlight this nG line */
647 	int ch, count; /* current keymap and count prefix */
648 	int resized; /* set when in a resize event */
649 	int focussed; /* Only set on one parent or child view at a time. */
650 	int dying;
651 	struct tog_view *parent;
652 	struct tog_view *child;
653 
654 	/*
655 	 * This flag is initially set on parent views when a new child view
656 	 * is created. It gets toggled when the 'Tab' key switches focus
657 	 * between parent and child.
658 	 * The flag indicates whether focus should be passed on to our child
659 	 * view if this parent view gets picked for focus after another parent
660 	 * view was closed. This prevents child views from losing focus in such
661 	 * situations.
662 	 */
663 	int focus_child;
664 
665 	enum tog_view_mode mode;
666 	/* type-specific state */
667 	enum tog_view_type type;
668 	union {
669 		struct tog_diff_view_state diff;
670 		struct tog_log_view_state log;
671 		struct tog_blame_view_state blame;
672 		struct tog_tree_view_state tree;
673 		struct tog_ref_view_state ref;
674 		struct tog_help_view_state help;
675 	} state;
676 
677 	const struct got_error *(*show)(struct tog_view *);
678 	const struct got_error *(*input)(struct tog_view **,
679 	    struct tog_view *, int);
680 	const struct got_error *(*reset)(struct tog_view *);
681 	const struct got_error *(*resize)(struct tog_view *, int);
682 	const struct got_error *(*close)(struct tog_view *);
683 
684 	const struct got_error *(*search_start)(struct tog_view *);
685 	const struct got_error *(*search_next)(struct tog_view *);
686 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
687 	    int **, int **, int **, int **);
688 	int search_started;
689 	int searching;
690 #define TOG_SEARCH_FORWARD	1
691 #define TOG_SEARCH_BACKWARD	2
692 	int search_next_done;
693 #define TOG_SEARCH_HAVE_MORE	1
694 #define TOG_SEARCH_NO_MORE	2
695 #define TOG_SEARCH_HAVE_NONE	3
696 	regex_t regex;
697 	regmatch_t regmatch;
698 	const char *action;
699 };
700 
701 static const struct got_error *open_diff_view(struct tog_view *,
702     struct got_object_id *, struct got_object_id *,
703     const char *, const char *, int, int, int, struct tog_view *,
704     struct got_repository *);
705 static const struct got_error *show_diff_view(struct tog_view *);
706 static const struct got_error *input_diff_view(struct tog_view **,
707     struct tog_view *, int);
708 static const struct got_error *reset_diff_view(struct tog_view *);
709 static const struct got_error* close_diff_view(struct tog_view *);
710 static const struct got_error *search_start_diff_view(struct tog_view *);
711 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
712     size_t *, int **, int **, int **, int **);
713 static const struct got_error *search_next_view_match(struct tog_view *);
714 
715 static const struct got_error *open_log_view(struct tog_view *,
716     struct got_object_id *, struct got_repository *,
717     const char *, const char *, int);
718 static const struct got_error * show_log_view(struct tog_view *);
719 static const struct got_error *input_log_view(struct tog_view **,
720     struct tog_view *, int);
721 static const struct got_error *resize_log_view(struct tog_view *, int);
722 static const struct got_error *close_log_view(struct tog_view *);
723 static const struct got_error *search_start_log_view(struct tog_view *);
724 static const struct got_error *search_next_log_view(struct tog_view *);
725 
726 static const struct got_error *open_blame_view(struct tog_view *, char *,
727     struct got_object_id *, struct got_repository *);
728 static const struct got_error *show_blame_view(struct tog_view *);
729 static const struct got_error *input_blame_view(struct tog_view **,
730     struct tog_view *, int);
731 static const struct got_error *reset_blame_view(struct tog_view *);
732 static const struct got_error *close_blame_view(struct tog_view *);
733 static const struct got_error *search_start_blame_view(struct tog_view *);
734 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
735     size_t *, int **, int **, int **, int **);
736 
737 static const struct got_error *open_tree_view(struct tog_view *,
738     struct got_object_id *, const char *, struct got_repository *);
739 static const struct got_error *show_tree_view(struct tog_view *);
740 static const struct got_error *input_tree_view(struct tog_view **,
741     struct tog_view *, int);
742 static const struct got_error *close_tree_view(struct tog_view *);
743 static const struct got_error *search_start_tree_view(struct tog_view *);
744 static const struct got_error *search_next_tree_view(struct tog_view *);
745 
746 static const struct got_error *open_ref_view(struct tog_view *,
747     struct got_repository *);
748 static const struct got_error *show_ref_view(struct tog_view *);
749 static const struct got_error *input_ref_view(struct tog_view **,
750     struct tog_view *, int);
751 static const struct got_error *close_ref_view(struct tog_view *);
752 static const struct got_error *search_start_ref_view(struct tog_view *);
753 static const struct got_error *search_next_ref_view(struct tog_view *);
754 
755 static const struct got_error *open_help_view(struct tog_view *,
756     struct tog_view *);
757 static const struct got_error *show_help_view(struct tog_view *);
758 static const struct got_error *input_help_view(struct tog_view **,
759     struct tog_view *, int);
760 static const struct got_error *reset_help_view(struct tog_view *);
761 static const struct got_error* close_help_view(struct tog_view *);
762 static const struct got_error *search_start_help_view(struct tog_view *);
763 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
764     size_t *, int **, int **, int **, int **);
765 
766 static volatile sig_atomic_t tog_sigwinch_received;
767 static volatile sig_atomic_t tog_sigpipe_received;
768 static volatile sig_atomic_t tog_sigcont_received;
769 static volatile sig_atomic_t tog_sigint_received;
770 static volatile sig_atomic_t tog_sigterm_received;
771 
772 static void
773 tog_sigwinch(int signo)
774 {
775 	tog_sigwinch_received = 1;
776 }
777 
778 static void
779 tog_sigpipe(int signo)
780 {
781 	tog_sigpipe_received = 1;
782 }
783 
784 static void
785 tog_sigcont(int signo)
786 {
787 	tog_sigcont_received = 1;
788 }
789 
790 static void
791 tog_sigint(int signo)
792 {
793 	tog_sigint_received = 1;
794 }
795 
796 static void
797 tog_sigterm(int signo)
798 {
799 	tog_sigterm_received = 1;
800 }
801 
802 static int
803 tog_fatal_signal_received(void)
804 {
805 	return (tog_sigpipe_received ||
806 	    tog_sigint_received || tog_sigterm_received);
807 }
808 
809 static const struct got_error *
810 view_close(struct tog_view *view)
811 {
812 	const struct got_error *err = NULL, *child_err = NULL;
813 
814 	if (view->child) {
815 		child_err = view_close(view->child);
816 		view->child = NULL;
817 	}
818 	if (view->close)
819 		err = view->close(view);
820 	if (view->panel)
821 		del_panel(view->panel);
822 	if (view->window)
823 		delwin(view->window);
824 	free(view);
825 	return err ? err : child_err;
826 }
827 
828 static struct tog_view *
829 view_open(int nlines, int ncols, int begin_y, int begin_x,
830     enum tog_view_type type)
831 {
832 	struct tog_view *view = calloc(1, sizeof(*view));
833 
834 	if (view == NULL)
835 		return NULL;
836 
837 	view->type = type;
838 	view->lines = LINES;
839 	view->cols = COLS;
840 	view->nlines = nlines ? nlines : LINES - begin_y;
841 	view->ncols = ncols ? ncols : COLS - begin_x;
842 	view->begin_y = begin_y;
843 	view->begin_x = begin_x;
844 	view->window = newwin(nlines, ncols, begin_y, begin_x);
845 	if (view->window == NULL) {
846 		view_close(view);
847 		return NULL;
848 	}
849 	view->panel = new_panel(view->window);
850 	if (view->panel == NULL ||
851 	    set_panel_userptr(view->panel, view) != OK) {
852 		view_close(view);
853 		return NULL;
854 	}
855 
856 	keypad(view->window, TRUE);
857 	return view;
858 }
859 
860 static int
861 view_split_begin_x(int begin_x)
862 {
863 	if (begin_x > 0 || COLS < 120)
864 		return 0;
865 	return (COLS - MAX(COLS / 2, 80));
866 }
867 
868 /* XXX Stub till we decide what to do. */
869 static int
870 view_split_begin_y(int lines)
871 {
872 	return lines * HSPLIT_SCALE;
873 }
874 
875 static const struct got_error *view_resize(struct tog_view *);
876 
877 static const struct got_error *
878 view_splitscreen(struct tog_view *view)
879 {
880 	const struct got_error *err = NULL;
881 
882 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
883 		if (view->resized_y && view->resized_y < view->lines)
884 			view->begin_y = view->resized_y;
885 		else
886 			view->begin_y = view_split_begin_y(view->nlines);
887 		view->begin_x = 0;
888 	} else if (!view->resized) {
889 		if (view->resized_x && view->resized_x < view->cols - 1 &&
890 		    view->cols > 119)
891 			view->begin_x = view->resized_x;
892 		else
893 			view->begin_x = view_split_begin_x(0);
894 		view->begin_y = 0;
895 	}
896 	view->nlines = LINES - view->begin_y;
897 	view->ncols = COLS - view->begin_x;
898 	view->lines = LINES;
899 	view->cols = COLS;
900 	err = view_resize(view);
901 	if (err)
902 		return err;
903 
904 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
905 		view->parent->nlines = view->begin_y;
906 
907 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
908 		return got_error_from_errno("mvwin");
909 
910 	return NULL;
911 }
912 
913 static const struct got_error *
914 view_fullscreen(struct tog_view *view)
915 {
916 	const struct got_error *err = NULL;
917 
918 	view->begin_x = 0;
919 	view->begin_y = view->resized ? view->begin_y : 0;
920 	view->nlines = view->resized ? view->nlines : LINES;
921 	view->ncols = COLS;
922 	view->lines = LINES;
923 	view->cols = COLS;
924 	err = view_resize(view);
925 	if (err)
926 		return err;
927 
928 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
929 		return got_error_from_errno("mvwin");
930 
931 	return NULL;
932 }
933 
934 static int
935 view_is_parent_view(struct tog_view *view)
936 {
937 	return view->parent == NULL;
938 }
939 
940 static int
941 view_is_splitscreen(struct tog_view *view)
942 {
943 	return view->begin_x > 0 || view->begin_y > 0;
944 }
945 
946 static int
947 view_is_fullscreen(struct tog_view *view)
948 {
949 	return view->nlines == LINES && view->ncols == COLS;
950 }
951 
952 static int
953 view_is_hsplit_top(struct tog_view *view)
954 {
955 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
956 	    view_is_splitscreen(view->child);
957 }
958 
959 static void
960 view_border(struct tog_view *view)
961 {
962 	PANEL *panel;
963 	const struct tog_view *view_above;
964 
965 	if (view->parent)
966 		return view_border(view->parent);
967 
968 	panel = panel_above(view->panel);
969 	if (panel == NULL)
970 		return;
971 
972 	view_above = panel_userptr(panel);
973 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
974 		mvwhline(view->window, view_above->begin_y - 1,
975 		    view->begin_x, got_locale_is_utf8() ?
976 		    ACS_HLINE : '-', view->ncols);
977 	else
978 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
979 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
980 }
981 
982 static const struct got_error *view_init_hsplit(struct tog_view *, int);
983 static const struct got_error *request_log_commits(struct tog_view *);
984 static const struct got_error *offset_selection_down(struct tog_view *);
985 static void offset_selection_up(struct tog_view *);
986 static void view_get_split(struct tog_view *, int *, int *);
987 
988 static const struct got_error *
989 view_resize(struct tog_view *view)
990 {
991 	const struct got_error	*err = NULL;
992 	int			 dif, nlines, ncols;
993 
994 	dif = LINES - view->lines;  /* line difference */
995 
996 	if (view->lines > LINES)
997 		nlines = view->nlines - (view->lines - LINES);
998 	else
999 		nlines = view->nlines + (LINES - view->lines);
1000 	if (view->cols > COLS)
1001 		ncols = view->ncols - (view->cols - COLS);
1002 	else
1003 		ncols = view->ncols + (COLS - view->cols);
1004 
1005 	if (view->child) {
1006 		int hs = view->child->begin_y;
1007 
1008 		if (!view_is_fullscreen(view))
1009 			view->child->begin_x = view_split_begin_x(view->begin_x);
1010 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1011 		    view->child->begin_x == 0) {
1012 			ncols = COLS;
1013 
1014 			view_fullscreen(view->child);
1015 			if (view->child->focussed)
1016 				show_panel(view->child->panel);
1017 			else
1018 				show_panel(view->panel);
1019 		} else {
1020 			ncols = view->child->begin_x;
1021 
1022 			view_splitscreen(view->child);
1023 			show_panel(view->child->panel);
1024 		}
1025 		/*
1026 		 * XXX This is ugly and needs to be moved into the above
1027 		 * logic but "works" for now and my attempts at moving it
1028 		 * break either 'tab' or 'F' key maps in horizontal splits.
1029 		 */
1030 		if (hs) {
1031 			err = view_splitscreen(view->child);
1032 			if (err)
1033 				return err;
1034 			if (dif < 0) { /* top split decreased */
1035 				err = offset_selection_down(view);
1036 				if (err)
1037 					return err;
1038 			}
1039 			view_border(view);
1040 			update_panels();
1041 			doupdate();
1042 			show_panel(view->child->panel);
1043 			nlines = view->nlines;
1044 		}
1045 	} else if (view->parent == NULL)
1046 		ncols = COLS;
1047 
1048 	if (view->resize && dif > 0) {
1049 		err = view->resize(view, dif);
1050 		if (err)
1051 			return err;
1052 	}
1053 
1054 	if (wresize(view->window, nlines, ncols) == ERR)
1055 		return got_error_from_errno("wresize");
1056 	if (replace_panel(view->panel, view->window) == ERR)
1057 		return got_error_from_errno("replace_panel");
1058 	wclear(view->window);
1059 
1060 	view->nlines = nlines;
1061 	view->ncols = ncols;
1062 	view->lines = LINES;
1063 	view->cols = COLS;
1064 
1065 	return NULL;
1066 }
1067 
1068 static const struct got_error *
1069 resize_log_view(struct tog_view *view, int increase)
1070 {
1071 	struct tog_log_view_state	*s = &view->state.log;
1072 	const struct got_error		*err = NULL;
1073 	int				 n = 0;
1074 
1075 	if (s->selected_entry)
1076 		n = s->selected_entry->idx + view->lines - s->selected;
1077 
1078 	/*
1079 	 * Request commits to account for the increased
1080 	 * height so we have enough to populate the view.
1081 	 */
1082 	if (s->commits->ncommits < n) {
1083 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1084 		err = request_log_commits(view);
1085 	}
1086 
1087 	return err;
1088 }
1089 
1090 static void
1091 view_adjust_offset(struct tog_view *view, int n)
1092 {
1093 	if (n == 0)
1094 		return;
1095 
1096 	if (view->parent && view->parent->offset) {
1097 		if (view->parent->offset + n >= 0)
1098 			view->parent->offset += n;
1099 		else
1100 			view->parent->offset = 0;
1101 	} else if (view->offset) {
1102 		if (view->offset - n >= 0)
1103 			view->offset -= n;
1104 		else
1105 			view->offset = 0;
1106 	}
1107 }
1108 
1109 static const struct got_error *
1110 view_resize_split(struct tog_view *view, int resize)
1111 {
1112 	const struct got_error	*err = NULL;
1113 	struct tog_view		*v = NULL;
1114 
1115 	if (view->parent)
1116 		v = view->parent;
1117 	else
1118 		v = view;
1119 
1120 	if (!v->child || !view_is_splitscreen(v->child))
1121 		return NULL;
1122 
1123 	v->resized = v->child->resized = resize;  /* lock for resize event */
1124 
1125 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1126 		if (v->child->resized_y)
1127 			v->child->begin_y = v->child->resized_y;
1128 		if (view->parent)
1129 			v->child->begin_y -= resize;
1130 		else
1131 			v->child->begin_y += resize;
1132 		if (v->child->begin_y < 3) {
1133 			view->count = 0;
1134 			v->child->begin_y = 3;
1135 		} else if (v->child->begin_y > LINES - 1) {
1136 			view->count = 0;
1137 			v->child->begin_y = LINES - 1;
1138 		}
1139 		v->ncols = COLS;
1140 		v->child->ncols = COLS;
1141 		view_adjust_offset(view, resize);
1142 		err = view_init_hsplit(v, v->child->begin_y);
1143 		if (err)
1144 			return err;
1145 		v->child->resized_y = v->child->begin_y;
1146 	} else {
1147 		if (v->child->resized_x)
1148 			v->child->begin_x = v->child->resized_x;
1149 		if (view->parent)
1150 			v->child->begin_x -= resize;
1151 		else
1152 			v->child->begin_x += resize;
1153 		if (v->child->begin_x < 11) {
1154 			view->count = 0;
1155 			v->child->begin_x = 11;
1156 		} else if (v->child->begin_x > COLS - 1) {
1157 			view->count = 0;
1158 			v->child->begin_x = COLS - 1;
1159 		}
1160 		v->child->resized_x = v->child->begin_x;
1161 	}
1162 
1163 	v->child->mode = v->mode;
1164 	v->child->nlines = v->lines - v->child->begin_y;
1165 	v->child->ncols = v->cols - v->child->begin_x;
1166 	v->focus_child = 1;
1167 
1168 	err = view_fullscreen(v);
1169 	if (err)
1170 		return err;
1171 	err = view_splitscreen(v->child);
1172 	if (err)
1173 		return err;
1174 
1175 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1176 		err = offset_selection_down(v->child);
1177 		if (err)
1178 			return err;
1179 	}
1180 
1181 	if (v->resize)
1182 		err = v->resize(v, 0);
1183 	else if (v->child->resize)
1184 		err = v->child->resize(v->child, 0);
1185 
1186 	v->resized = v->child->resized = 0;
1187 
1188 	return err;
1189 }
1190 
1191 static void
1192 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1193 {
1194 	struct tog_view *v = src->child ? src->child : src;
1195 
1196 	dst->resized_x = v->resized_x;
1197 	dst->resized_y = v->resized_y;
1198 }
1199 
1200 static const struct got_error *
1201 view_close_child(struct tog_view *view)
1202 {
1203 	const struct got_error *err = NULL;
1204 
1205 	if (view->child == NULL)
1206 		return NULL;
1207 
1208 	err = view_close(view->child);
1209 	view->child = NULL;
1210 	return err;
1211 }
1212 
1213 static const struct got_error *
1214 view_set_child(struct tog_view *view, struct tog_view *child)
1215 {
1216 	const struct got_error *err = NULL;
1217 
1218 	view->child = child;
1219 	child->parent = view;
1220 
1221 	err = view_resize(view);
1222 	if (err)
1223 		return err;
1224 
1225 	if (view->child->resized_x || view->child->resized_y)
1226 		err = view_resize_split(view, 0);
1227 
1228 	return err;
1229 }
1230 
1231 static const struct got_error *view_dispatch_request(struct tog_view **,
1232     struct tog_view *, enum tog_view_type, int, int);
1233 
1234 static const struct got_error *
1235 view_request_new(struct tog_view **requested, struct tog_view *view,
1236     enum tog_view_type request)
1237 {
1238 	struct tog_view		*new_view = NULL;
1239 	const struct got_error	*err;
1240 	int			 y = 0, x = 0;
1241 
1242 	*requested = NULL;
1243 
1244 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1245 		view_get_split(view, &y, &x);
1246 
1247 	err = view_dispatch_request(&new_view, view, request, y, x);
1248 	if (err)
1249 		return err;
1250 
1251 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1252 	    request != TOG_VIEW_HELP) {
1253 		err = view_init_hsplit(view, y);
1254 		if (err)
1255 			return err;
1256 	}
1257 
1258 	view->focussed = 0;
1259 	new_view->focussed = 1;
1260 	new_view->mode = view->mode;
1261 	new_view->nlines = request == TOG_VIEW_HELP ?
1262 	    view->lines : view->lines - y;
1263 
1264 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1265 		view_transfer_size(new_view, view);
1266 		err = view_close_child(view);
1267 		if (err)
1268 			return err;
1269 		err = view_set_child(view, new_view);
1270 		if (err)
1271 			return err;
1272 		view->focus_child = 1;
1273 	} else
1274 		*requested = new_view;
1275 
1276 	return NULL;
1277 }
1278 
1279 static void
1280 tog_resizeterm(void)
1281 {
1282 	int cols, lines;
1283 	struct winsize size;
1284 
1285 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1286 		cols = 80;     /* Default */
1287 		lines = 24;
1288 	} else {
1289 		cols = size.ws_col;
1290 		lines = size.ws_row;
1291 	}
1292 	resize_term(lines, cols);
1293 }
1294 
1295 static const struct got_error *
1296 view_search_start(struct tog_view *view)
1297 {
1298 	const struct got_error *err = NULL;
1299 	struct tog_view *v = view;
1300 	char pattern[1024];
1301 	int ret;
1302 
1303 	if (view->search_started) {
1304 		regfree(&view->regex);
1305 		view->searching = 0;
1306 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1307 	}
1308 	view->search_started = 0;
1309 
1310 	if (view->nlines < 1)
1311 		return NULL;
1312 
1313 	if (view_is_hsplit_top(view))
1314 		v = view->child;
1315 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1316 		v = view->parent;
1317 
1318 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1319 	wclrtoeol(v->window);
1320 
1321 	nodelay(v->window, FALSE);  /* block for search term input */
1322 	nocbreak();
1323 	echo();
1324 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1325 	wrefresh(v->window);
1326 	cbreak();
1327 	noecho();
1328 	nodelay(v->window, TRUE);
1329 	if (ret == ERR)
1330 		return NULL;
1331 
1332 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1333 		err = view->search_start(view);
1334 		if (err) {
1335 			regfree(&view->regex);
1336 			return err;
1337 		}
1338 		view->search_started = 1;
1339 		view->searching = TOG_SEARCH_FORWARD;
1340 		view->search_next_done = 0;
1341 		view->search_next(view);
1342 	}
1343 
1344 	return NULL;
1345 }
1346 
1347 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1348 static const struct got_error *
1349 switch_split(struct tog_view *view)
1350 {
1351 	const struct got_error	*err = NULL;
1352 	struct tog_view		*v = NULL;
1353 
1354 	if (view->parent)
1355 		v = view->parent;
1356 	else
1357 		v = view;
1358 
1359 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1360 		v->mode = TOG_VIEW_SPLIT_VERT;
1361 	else
1362 		v->mode = TOG_VIEW_SPLIT_HRZN;
1363 
1364 	if (!v->child)
1365 		return NULL;
1366 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1367 		v->mode = TOG_VIEW_SPLIT_NONE;
1368 
1369 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1370 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1371 		v->child->begin_y = v->child->resized_y;
1372 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1373 		v->child->begin_x = v->child->resized_x;
1374 
1375 
1376 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1377 		v->ncols = COLS;
1378 		v->child->ncols = COLS;
1379 		v->child->nscrolled = LINES - v->child->nlines;
1380 
1381 		err = view_init_hsplit(v, v->child->begin_y);
1382 		if (err)
1383 			return err;
1384 	}
1385 	v->child->mode = v->mode;
1386 	v->child->nlines = v->lines - v->child->begin_y;
1387 	v->focus_child = 1;
1388 
1389 	err = view_fullscreen(v);
1390 	if (err)
1391 		return err;
1392 	err = view_splitscreen(v->child);
1393 	if (err)
1394 		return err;
1395 
1396 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1397 		v->mode = TOG_VIEW_SPLIT_VERT;
1398 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1399 		err = offset_selection_down(v);
1400 		if (err)
1401 			return err;
1402 		err = offset_selection_down(v->child);
1403 		if (err)
1404 			return err;
1405 	} else {
1406 		offset_selection_up(v);
1407 		offset_selection_up(v->child);
1408 	}
1409 	if (v->resize)
1410 		err = v->resize(v, 0);
1411 	else if (v->child->resize)
1412 		err = v->child->resize(v->child, 0);
1413 
1414 	return err;
1415 }
1416 
1417 /*
1418  * Compute view->count from numeric input. Assign total to view->count and
1419  * return first non-numeric key entered.
1420  */
1421 static int
1422 get_compound_key(struct tog_view *view, int c)
1423 {
1424 	struct tog_view	*v = view;
1425 	int		 x, n = 0;
1426 
1427 	if (view_is_hsplit_top(view))
1428 		v = view->child;
1429 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1430 		v = view->parent;
1431 
1432 	view->count = 0;
1433 	cbreak();  /* block for input */
1434 	nodelay(view->window, FALSE);
1435 	wmove(v->window, v->nlines - 1, 0);
1436 	wclrtoeol(v->window);
1437 	waddch(v->window, ':');
1438 
1439 	do {
1440 		x = getcurx(v->window);
1441 		if (x != ERR && x < view->ncols) {
1442 			waddch(v->window, c);
1443 			wrefresh(v->window);
1444 		}
1445 
1446 		/*
1447 		 * Don't overflow. Max valid request should be the greatest
1448 		 * between the longest and total lines; cap at 10 million.
1449 		 */
1450 		if (n >= 9999999)
1451 			n = 9999999;
1452 		else
1453 			n = n * 10 + (c - '0');
1454 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1455 
1456 	if (c == 'G' || c == 'g') {	/* nG key map */
1457 		view->gline = view->hiline = n;
1458 		n = 0;
1459 		c = 0;
1460 	}
1461 
1462 	/* Massage excessive or inapplicable values at the input handler. */
1463 	view->count = n;
1464 
1465 	return c;
1466 }
1467 
1468 static void
1469 action_report(struct tog_view *view)
1470 {
1471 	struct tog_view *v = view;
1472 
1473 	if (view_is_hsplit_top(view))
1474 		v = view->child;
1475 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1476 		v = view->parent;
1477 
1478 	wmove(v->window, v->nlines - 1, 0);
1479 	wclrtoeol(v->window);
1480 	wprintw(v->window, ":%s", view->action);
1481 	wrefresh(v->window);
1482 
1483 	/*
1484 	 * Clear action status report. Only clear in blame view
1485 	 * once annotating is complete, otherwise it's too fast.
1486 	 */
1487 	if (view->type == TOG_VIEW_BLAME) {
1488 		if (view->state.blame.blame_complete)
1489 			view->action = NULL;
1490 	} else
1491 		view->action = NULL;
1492 }
1493 
1494 static const struct got_error *
1495 view_input(struct tog_view **new, int *done, struct tog_view *view,
1496     struct tog_view_list_head *views)
1497 {
1498 	const struct got_error *err = NULL;
1499 	struct tog_view *v;
1500 	int ch, errcode;
1501 
1502 	*new = NULL;
1503 
1504 	if (view->action)
1505 		action_report(view);
1506 
1507 	/* Clear "no matches" indicator. */
1508 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1509 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1510 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1511 		view->count = 0;
1512 	}
1513 
1514 	if (view->searching && !view->search_next_done) {
1515 		errcode = pthread_mutex_unlock(&tog_mutex);
1516 		if (errcode)
1517 			return got_error_set_errno(errcode,
1518 			    "pthread_mutex_unlock");
1519 		sched_yield();
1520 		errcode = pthread_mutex_lock(&tog_mutex);
1521 		if (errcode)
1522 			return got_error_set_errno(errcode,
1523 			    "pthread_mutex_lock");
1524 		view->search_next(view);
1525 		return NULL;
1526 	}
1527 
1528 	/* Allow threads to make progress while we are waiting for input. */
1529 	errcode = pthread_mutex_unlock(&tog_mutex);
1530 	if (errcode)
1531 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1532 	/* If we have an unfinished count, let C-g or backspace abort. */
1533 	if (view->count && --view->count) {
1534 		cbreak();
1535 		nodelay(view->window, TRUE);
1536 		ch = wgetch(view->window);
1537 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1538 			view->count = 0;
1539 		else
1540 			ch = view->ch;
1541 	} else {
1542 		ch = wgetch(view->window);
1543 		if (ch >= '1' && ch  <= '9')
1544 			view->ch = ch = get_compound_key(view, ch);
1545 	}
1546 	if (view->hiline && ch != ERR && ch != 0)
1547 		view->hiline = 0;  /* key pressed, clear line highlight */
1548 	nodelay(view->window, TRUE);
1549 	errcode = pthread_mutex_lock(&tog_mutex);
1550 	if (errcode)
1551 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1552 
1553 	if (tog_sigwinch_received || tog_sigcont_received) {
1554 		tog_resizeterm();
1555 		tog_sigwinch_received = 0;
1556 		tog_sigcont_received = 0;
1557 		TAILQ_FOREACH(v, views, entry) {
1558 			err = view_resize(v);
1559 			if (err)
1560 				return err;
1561 			err = v->input(new, v, KEY_RESIZE);
1562 			if (err)
1563 				return err;
1564 			if (v->child) {
1565 				err = view_resize(v->child);
1566 				if (err)
1567 					return err;
1568 				err = v->child->input(new, v->child,
1569 				    KEY_RESIZE);
1570 				if (err)
1571 					return err;
1572 				if (v->child->resized_x || v->child->resized_y) {
1573 					err = view_resize_split(v, 0);
1574 					if (err)
1575 						return err;
1576 				}
1577 			}
1578 		}
1579 	}
1580 
1581 	switch (ch) {
1582 	case '?':
1583 	case 'H':
1584 	case KEY_F(1):
1585 		if (view->type == TOG_VIEW_HELP)
1586 			err = view->reset(view);
1587 		else
1588 			err = view_request_new(new, view, TOG_VIEW_HELP);
1589 		break;
1590 	case '\t':
1591 		view->count = 0;
1592 		if (view->child) {
1593 			view->focussed = 0;
1594 			view->child->focussed = 1;
1595 			view->focus_child = 1;
1596 		} else if (view->parent) {
1597 			view->focussed = 0;
1598 			view->parent->focussed = 1;
1599 			view->parent->focus_child = 0;
1600 			if (!view_is_splitscreen(view)) {
1601 				if (view->parent->resize) {
1602 					err = view->parent->resize(view->parent,
1603 					    0);
1604 					if (err)
1605 						return err;
1606 				}
1607 				offset_selection_up(view->parent);
1608 				err = view_fullscreen(view->parent);
1609 				if (err)
1610 					return err;
1611 			}
1612 		}
1613 		break;
1614 	case 'q':
1615 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1616 			if (view->parent->resize) {
1617 				/* might need more commits to fill fullscreen */
1618 				err = view->parent->resize(view->parent, 0);
1619 				if (err)
1620 					break;
1621 			}
1622 			offset_selection_up(view->parent);
1623 		}
1624 		err = view->input(new, view, ch);
1625 		view->dying = 1;
1626 		break;
1627 	case 'Q':
1628 		*done = 1;
1629 		break;
1630 	case 'F':
1631 		view->count = 0;
1632 		if (view_is_parent_view(view)) {
1633 			if (view->child == NULL)
1634 				break;
1635 			if (view_is_splitscreen(view->child)) {
1636 				view->focussed = 0;
1637 				view->child->focussed = 1;
1638 				err = view_fullscreen(view->child);
1639 			} else {
1640 				err = view_splitscreen(view->child);
1641 				if (!err)
1642 					err = view_resize_split(view, 0);
1643 			}
1644 			if (err)
1645 				break;
1646 			err = view->child->input(new, view->child,
1647 			    KEY_RESIZE);
1648 		} else {
1649 			if (view_is_splitscreen(view)) {
1650 				view->parent->focussed = 0;
1651 				view->focussed = 1;
1652 				err = view_fullscreen(view);
1653 			} else {
1654 				err = view_splitscreen(view);
1655 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1656 					err = view_resize(view->parent);
1657 				if (!err)
1658 					err = view_resize_split(view, 0);
1659 			}
1660 			if (err)
1661 				break;
1662 			err = view->input(new, view, KEY_RESIZE);
1663 		}
1664 		if (err)
1665 			break;
1666 		if (view->resize) {
1667 			err = view->resize(view, 0);
1668 			if (err)
1669 				break;
1670 		}
1671 		if (view->parent)
1672 			err = offset_selection_down(view->parent);
1673 		if (!err)
1674 			err = offset_selection_down(view);
1675 		break;
1676 	case 'S':
1677 		view->count = 0;
1678 		err = switch_split(view);
1679 		break;
1680 	case '-':
1681 		err = view_resize_split(view, -1);
1682 		break;
1683 	case '+':
1684 		err = view_resize_split(view, 1);
1685 		break;
1686 	case KEY_RESIZE:
1687 		break;
1688 	case '/':
1689 		view->count = 0;
1690 		if (view->search_start)
1691 			view_search_start(view);
1692 		else
1693 			err = view->input(new, view, ch);
1694 		break;
1695 	case 'N':
1696 	case 'n':
1697 		if (view->search_started && view->search_next) {
1698 			view->searching = (ch == 'n' ?
1699 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1700 			view->search_next_done = 0;
1701 			view->search_next(view);
1702 		} else
1703 			err = view->input(new, view, ch);
1704 		break;
1705 	case 'A':
1706 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1707 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1708 			view->action = "Patience diff algorithm";
1709 		} else {
1710 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1711 			view->action = "Myers diff algorithm";
1712 		}
1713 		TAILQ_FOREACH(v, views, entry) {
1714 			if (v->reset) {
1715 				err = v->reset(v);
1716 				if (err)
1717 					return err;
1718 			}
1719 			if (v->child && v->child->reset) {
1720 				err = v->child->reset(v->child);
1721 				if (err)
1722 					return err;
1723 			}
1724 		}
1725 		break;
1726 	default:
1727 		err = view->input(new, view, ch);
1728 		break;
1729 	}
1730 
1731 	return err;
1732 }
1733 
1734 static int
1735 view_needs_focus_indication(struct tog_view *view)
1736 {
1737 	if (view_is_parent_view(view)) {
1738 		if (view->child == NULL || view->child->focussed)
1739 			return 0;
1740 		if (!view_is_splitscreen(view->child))
1741 			return 0;
1742 	} else if (!view_is_splitscreen(view))
1743 		return 0;
1744 
1745 	return view->focussed;
1746 }
1747 
1748 static const struct got_error *
1749 view_loop(struct tog_view *view)
1750 {
1751 	const struct got_error *err = NULL;
1752 	struct tog_view_list_head views;
1753 	struct tog_view *new_view;
1754 	char *mode;
1755 	int fast_refresh = 10;
1756 	int done = 0, errcode;
1757 
1758 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1759 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1760 		view->mode = TOG_VIEW_SPLIT_VERT;
1761 	else
1762 		view->mode = TOG_VIEW_SPLIT_HRZN;
1763 
1764 	errcode = pthread_mutex_lock(&tog_mutex);
1765 	if (errcode)
1766 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1767 
1768 	TAILQ_INIT(&views);
1769 	TAILQ_INSERT_HEAD(&views, view, entry);
1770 
1771 	view->focussed = 1;
1772 	err = view->show(view);
1773 	if (err)
1774 		return err;
1775 	update_panels();
1776 	doupdate();
1777 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1778 	    !tog_fatal_signal_received()) {
1779 		/* Refresh fast during initialization, then become slower. */
1780 		if (fast_refresh && --fast_refresh == 0)
1781 			halfdelay(10); /* switch to once per second */
1782 
1783 		err = view_input(&new_view, &done, view, &views);
1784 		if (err)
1785 			break;
1786 
1787 		if (view->dying && view == TAILQ_FIRST(&views) &&
1788 		    TAILQ_NEXT(view, entry) == NULL)
1789 			done = 1;
1790 		if (done) {
1791 			struct tog_view *v;
1792 
1793 			/*
1794 			 * When we quit, scroll the screen up a single line
1795 			 * so we don't lose any information.
1796 			 */
1797 			TAILQ_FOREACH(v, &views, entry) {
1798 				wmove(v->window, 0, 0);
1799 				wdeleteln(v->window);
1800 				wnoutrefresh(v->window);
1801 				if (v->child && !view_is_fullscreen(v)) {
1802 					wmove(v->child->window, 0, 0);
1803 					wdeleteln(v->child->window);
1804 					wnoutrefresh(v->child->window);
1805 				}
1806 			}
1807 			doupdate();
1808 		}
1809 
1810 		if (view->dying) {
1811 			struct tog_view *v, *prev = NULL;
1812 
1813 			if (view_is_parent_view(view))
1814 				prev = TAILQ_PREV(view, tog_view_list_head,
1815 				    entry);
1816 			else if (view->parent)
1817 				prev = view->parent;
1818 
1819 			if (view->parent) {
1820 				view->parent->child = NULL;
1821 				view->parent->focus_child = 0;
1822 				/* Restore fullscreen line height. */
1823 				view->parent->nlines = view->parent->lines;
1824 				err = view_resize(view->parent);
1825 				if (err)
1826 					break;
1827 				/* Make resized splits persist. */
1828 				view_transfer_size(view->parent, view);
1829 			} else
1830 				TAILQ_REMOVE(&views, view, entry);
1831 
1832 			err = view_close(view);
1833 			if (err)
1834 				goto done;
1835 
1836 			view = NULL;
1837 			TAILQ_FOREACH(v, &views, entry) {
1838 				if (v->focussed)
1839 					break;
1840 			}
1841 			if (view == NULL && new_view == NULL) {
1842 				/* No view has focus. Try to pick one. */
1843 				if (prev)
1844 					view = prev;
1845 				else if (!TAILQ_EMPTY(&views)) {
1846 					view = TAILQ_LAST(&views,
1847 					    tog_view_list_head);
1848 				}
1849 				if (view) {
1850 					if (view->focus_child) {
1851 						view->child->focussed = 1;
1852 						view = view->child;
1853 					} else
1854 						view->focussed = 1;
1855 				}
1856 			}
1857 		}
1858 		if (new_view) {
1859 			struct tog_view *v, *t;
1860 			/* Only allow one parent view per type. */
1861 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1862 				if (v->type != new_view->type)
1863 					continue;
1864 				TAILQ_REMOVE(&views, v, entry);
1865 				err = view_close(v);
1866 				if (err)
1867 					goto done;
1868 				break;
1869 			}
1870 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1871 			view = new_view;
1872 		}
1873 		if (view && !done) {
1874 			if (view_is_parent_view(view)) {
1875 				if (view->child && view->child->focussed)
1876 					view = view->child;
1877 			} else {
1878 				if (view->parent && view->parent->focussed)
1879 					view = view->parent;
1880 			}
1881 			show_panel(view->panel);
1882 			if (view->child && view_is_splitscreen(view->child))
1883 				show_panel(view->child->panel);
1884 			if (view->parent && view_is_splitscreen(view)) {
1885 				err = view->parent->show(view->parent);
1886 				if (err)
1887 					goto done;
1888 			}
1889 			err = view->show(view);
1890 			if (err)
1891 				goto done;
1892 			if (view->child) {
1893 				err = view->child->show(view->child);
1894 				if (err)
1895 					goto done;
1896 			}
1897 			update_panels();
1898 			doupdate();
1899 		}
1900 	}
1901 done:
1902 	while (!TAILQ_EMPTY(&views)) {
1903 		const struct got_error *close_err;
1904 		view = TAILQ_FIRST(&views);
1905 		TAILQ_REMOVE(&views, view, entry);
1906 		close_err = view_close(view);
1907 		if (close_err && err == NULL)
1908 			err = close_err;
1909 	}
1910 
1911 	errcode = pthread_mutex_unlock(&tog_mutex);
1912 	if (errcode && err == NULL)
1913 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1914 
1915 	return err;
1916 }
1917 
1918 __dead static void
1919 usage_log(void)
1920 {
1921 	endwin();
1922 	fprintf(stderr,
1923 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1924 	    getprogname());
1925 	exit(1);
1926 }
1927 
1928 /* Create newly allocated wide-character string equivalent to a byte string. */
1929 static const struct got_error *
1930 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1931 {
1932 	char *vis = NULL;
1933 	const struct got_error *err = NULL;
1934 
1935 	*ws = NULL;
1936 	*wlen = mbstowcs(NULL, s, 0);
1937 	if (*wlen == (size_t)-1) {
1938 		int vislen;
1939 		if (errno != EILSEQ)
1940 			return got_error_from_errno("mbstowcs");
1941 
1942 		/* byte string invalid in current encoding; try to "fix" it */
1943 		err = got_mbsavis(&vis, &vislen, s);
1944 		if (err)
1945 			return err;
1946 		*wlen = mbstowcs(NULL, vis, 0);
1947 		if (*wlen == (size_t)-1) {
1948 			err = got_error_from_errno("mbstowcs"); /* give up */
1949 			goto done;
1950 		}
1951 	}
1952 
1953 	*ws = calloc(*wlen + 1, sizeof(**ws));
1954 	if (*ws == NULL) {
1955 		err = got_error_from_errno("calloc");
1956 		goto done;
1957 	}
1958 
1959 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1960 		err = got_error_from_errno("mbstowcs");
1961 done:
1962 	free(vis);
1963 	if (err) {
1964 		free(*ws);
1965 		*ws = NULL;
1966 		*wlen = 0;
1967 	}
1968 	return err;
1969 }
1970 
1971 static const struct got_error *
1972 expand_tab(char **ptr, const char *src)
1973 {
1974 	char	*dst;
1975 	size_t	 len, n, idx = 0, sz = 0;
1976 
1977 	*ptr = NULL;
1978 	n = len = strlen(src);
1979 	dst = malloc(n + 1);
1980 	if (dst == NULL)
1981 		return got_error_from_errno("malloc");
1982 
1983 	while (idx < len && src[idx]) {
1984 		const char c = src[idx];
1985 
1986 		if (c == '\t') {
1987 			size_t nb = TABSIZE - sz % TABSIZE;
1988 			char *p;
1989 
1990 			p = realloc(dst, n + nb);
1991 			if (p == NULL) {
1992 				free(dst);
1993 				return got_error_from_errno("realloc");
1994 
1995 			}
1996 			dst = p;
1997 			n += nb;
1998 			memset(dst + sz, ' ', nb);
1999 			sz += nb;
2000 		} else
2001 			dst[sz++] = src[idx];
2002 		++idx;
2003 	}
2004 
2005 	dst[sz] = '\0';
2006 	*ptr = dst;
2007 	return NULL;
2008 }
2009 
2010 /*
2011  * Advance at most n columns from wline starting at offset off.
2012  * Return the index to the first character after the span operation.
2013  * Return the combined column width of all spanned wide character in
2014  * *rcol.
2015  */
2016 static int
2017 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2018 {
2019 	int width, i, cols = 0;
2020 
2021 	if (n == 0) {
2022 		*rcol = cols;
2023 		return off;
2024 	}
2025 
2026 	for (i = off; wline[i] != L'\0'; ++i) {
2027 		if (wline[i] == L'\t')
2028 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2029 		else
2030 			width = wcwidth(wline[i]);
2031 
2032 		if (width == -1) {
2033 			width = 1;
2034 			wline[i] = L'.';
2035 		}
2036 
2037 		if (cols + width > n)
2038 			break;
2039 		cols += width;
2040 	}
2041 
2042 	*rcol = cols;
2043 	return i;
2044 }
2045 
2046 /*
2047  * Format a line for display, ensuring that it won't overflow a width limit.
2048  * With scrolling, the width returned refers to the scrolled version of the
2049  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2050  */
2051 static const struct got_error *
2052 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2053     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2054 {
2055 	const struct got_error *err = NULL;
2056 	int cols;
2057 	wchar_t *wline = NULL;
2058 	char *exstr = NULL;
2059 	size_t wlen;
2060 	int i, scrollx;
2061 
2062 	*wlinep = NULL;
2063 	*widthp = 0;
2064 
2065 	if (expand) {
2066 		err = expand_tab(&exstr, line);
2067 		if (err)
2068 			return err;
2069 	}
2070 
2071 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2072 	free(exstr);
2073 	if (err)
2074 		return err;
2075 
2076 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2077 
2078 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2079 		wline[wlen - 1] = L'\0';
2080 		wlen--;
2081 	}
2082 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2083 		wline[wlen - 1] = L'\0';
2084 		wlen--;
2085 	}
2086 
2087 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2088 	wline[i] = L'\0';
2089 
2090 	if (widthp)
2091 		*widthp = cols;
2092 	if (scrollxp)
2093 		*scrollxp = scrollx;
2094 	if (err)
2095 		free(wline);
2096 	else
2097 		*wlinep = wline;
2098 	return err;
2099 }
2100 
2101 static const struct got_error*
2102 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2103     struct got_object_id *id, struct got_repository *repo)
2104 {
2105 	static const struct got_error *err = NULL;
2106 	struct got_reflist_entry *re;
2107 	char *s;
2108 	const char *name;
2109 
2110 	*refs_str = NULL;
2111 
2112 	TAILQ_FOREACH(re, refs, entry) {
2113 		struct got_tag_object *tag = NULL;
2114 		struct got_object_id *ref_id;
2115 		int cmp;
2116 
2117 		name = got_ref_get_name(re->ref);
2118 		if (strcmp(name, GOT_REF_HEAD) == 0)
2119 			continue;
2120 		if (strncmp(name, "refs/", 5) == 0)
2121 			name += 5;
2122 		if (strncmp(name, "got/", 4) == 0 &&
2123 		    strncmp(name, "got/backup/", 11) != 0)
2124 			continue;
2125 		if (strncmp(name, "heads/", 6) == 0)
2126 			name += 6;
2127 		if (strncmp(name, "remotes/", 8) == 0) {
2128 			name += 8;
2129 			s = strstr(name, "/" GOT_REF_HEAD);
2130 			if (s != NULL && s[strlen(s)] == '\0')
2131 				continue;
2132 		}
2133 		err = got_ref_resolve(&ref_id, repo, re->ref);
2134 		if (err)
2135 			break;
2136 		if (strncmp(name, "tags/", 5) == 0) {
2137 			err = got_object_open_as_tag(&tag, repo, ref_id);
2138 			if (err) {
2139 				if (err->code != GOT_ERR_OBJ_TYPE) {
2140 					free(ref_id);
2141 					break;
2142 				}
2143 				/* Ref points at something other than a tag. */
2144 				err = NULL;
2145 				tag = NULL;
2146 			}
2147 		}
2148 		cmp = got_object_id_cmp(tag ?
2149 		    got_object_tag_get_object_id(tag) : ref_id, id);
2150 		free(ref_id);
2151 		if (tag)
2152 			got_object_tag_close(tag);
2153 		if (cmp != 0)
2154 			continue;
2155 		s = *refs_str;
2156 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2157 		    s ? ", " : "", name) == -1) {
2158 			err = got_error_from_errno("asprintf");
2159 			free(s);
2160 			*refs_str = NULL;
2161 			break;
2162 		}
2163 		free(s);
2164 	}
2165 
2166 	return err;
2167 }
2168 
2169 static const struct got_error *
2170 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2171     int col_tab_align)
2172 {
2173 	char *smallerthan;
2174 
2175 	smallerthan = strchr(author, '<');
2176 	if (smallerthan && smallerthan[1] != '\0')
2177 		author = smallerthan + 1;
2178 	author[strcspn(author, "@>")] = '\0';
2179 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2180 	    col_tab_align, 0);
2181 }
2182 
2183 static const struct got_error *
2184 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2185     struct got_object_id *id, const size_t date_display_cols,
2186     int author_display_cols)
2187 {
2188 	struct tog_log_view_state *s = &view->state.log;
2189 	const struct got_error *err = NULL;
2190 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2191 	char *logmsg0 = NULL, *logmsg = NULL;
2192 	char *author = NULL;
2193 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2194 	int author_width, logmsg_width;
2195 	char *newline, *line = NULL;
2196 	int col, limit, scrollx;
2197 	const int avail = view->ncols;
2198 	struct tm tm;
2199 	time_t committer_time;
2200 	struct tog_color *tc;
2201 
2202 	committer_time = got_object_commit_get_committer_time(commit);
2203 	if (gmtime_r(&committer_time, &tm) == NULL)
2204 		return got_error_from_errno("gmtime_r");
2205 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2206 		return got_error(GOT_ERR_NO_SPACE);
2207 
2208 	if (avail <= date_display_cols)
2209 		limit = MIN(sizeof(datebuf) - 1, avail);
2210 	else
2211 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2212 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2213 	if (tc)
2214 		wattr_on(view->window,
2215 		    COLOR_PAIR(tc->colorpair), NULL);
2216 	waddnstr(view->window, datebuf, limit);
2217 	if (tc)
2218 		wattr_off(view->window,
2219 		    COLOR_PAIR(tc->colorpair), NULL);
2220 	col = limit;
2221 	if (col > avail)
2222 		goto done;
2223 
2224 	if (avail >= 120) {
2225 		char *id_str;
2226 		err = got_object_id_str(&id_str, id);
2227 		if (err)
2228 			goto done;
2229 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2230 		if (tc)
2231 			wattr_on(view->window,
2232 			    COLOR_PAIR(tc->colorpair), NULL);
2233 		wprintw(view->window, "%.8s ", id_str);
2234 		if (tc)
2235 			wattr_off(view->window,
2236 			    COLOR_PAIR(tc->colorpair), NULL);
2237 		free(id_str);
2238 		col += 9;
2239 		if (col > avail)
2240 			goto done;
2241 	}
2242 
2243 	if (s->use_committer)
2244 		author = strdup(got_object_commit_get_committer(commit));
2245 	else
2246 		author = strdup(got_object_commit_get_author(commit));
2247 	if (author == NULL) {
2248 		err = got_error_from_errno("strdup");
2249 		goto done;
2250 	}
2251 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2252 	if (err)
2253 		goto done;
2254 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2255 	if (tc)
2256 		wattr_on(view->window,
2257 		    COLOR_PAIR(tc->colorpair), NULL);
2258 	waddwstr(view->window, wauthor);
2259 	col += author_width;
2260 	while (col < avail && author_width < author_display_cols + 2) {
2261 		waddch(view->window, ' ');
2262 		col++;
2263 		author_width++;
2264 	}
2265 	if (tc)
2266 		wattr_off(view->window,
2267 		    COLOR_PAIR(tc->colorpair), NULL);
2268 	if (col > avail)
2269 		goto done;
2270 
2271 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2272 	if (err)
2273 		goto done;
2274 	logmsg = logmsg0;
2275 	while (*logmsg == '\n')
2276 		logmsg++;
2277 	newline = strchr(logmsg, '\n');
2278 	if (newline)
2279 		*newline = '\0';
2280 	limit = avail - col;
2281 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2282 		limit--;	/* for the border */
2283 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2284 	    limit, col, 1);
2285 	if (err)
2286 		goto done;
2287 	waddwstr(view->window, &wlogmsg[scrollx]);
2288 	col += MAX(logmsg_width, 0);
2289 	while (col < avail) {
2290 		waddch(view->window, ' ');
2291 		col++;
2292 	}
2293 done:
2294 	free(logmsg0);
2295 	free(wlogmsg);
2296 	free(author);
2297 	free(wauthor);
2298 	free(line);
2299 	return err;
2300 }
2301 
2302 static struct commit_queue_entry *
2303 alloc_commit_queue_entry(struct got_commit_object *commit,
2304     struct got_object_id *id)
2305 {
2306 	struct commit_queue_entry *entry;
2307 	struct got_object_id *dup;
2308 
2309 	entry = calloc(1, sizeof(*entry));
2310 	if (entry == NULL)
2311 		return NULL;
2312 
2313 	dup = got_object_id_dup(id);
2314 	if (dup == NULL) {
2315 		free(entry);
2316 		return NULL;
2317 	}
2318 
2319 	entry->id = dup;
2320 	entry->commit = commit;
2321 	return entry;
2322 }
2323 
2324 static void
2325 pop_commit(struct commit_queue *commits)
2326 {
2327 	struct commit_queue_entry *entry;
2328 
2329 	entry = TAILQ_FIRST(&commits->head);
2330 	TAILQ_REMOVE(&commits->head, entry, entry);
2331 	got_object_commit_close(entry->commit);
2332 	commits->ncommits--;
2333 	free(entry->id);
2334 	free(entry);
2335 }
2336 
2337 static void
2338 free_commits(struct commit_queue *commits)
2339 {
2340 	while (!TAILQ_EMPTY(&commits->head))
2341 		pop_commit(commits);
2342 }
2343 
2344 static const struct got_error *
2345 match_commit(int *have_match, struct got_object_id *id,
2346     struct got_commit_object *commit, regex_t *regex)
2347 {
2348 	const struct got_error *err = NULL;
2349 	regmatch_t regmatch;
2350 	char *id_str = NULL, *logmsg = NULL;
2351 
2352 	*have_match = 0;
2353 
2354 	err = got_object_id_str(&id_str, id);
2355 	if (err)
2356 		return err;
2357 
2358 	err = got_object_commit_get_logmsg(&logmsg, commit);
2359 	if (err)
2360 		goto done;
2361 
2362 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2363 	    &regmatch, 0) == 0 ||
2364 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2365 	    &regmatch, 0) == 0 ||
2366 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2367 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2368 		*have_match = 1;
2369 done:
2370 	free(id_str);
2371 	free(logmsg);
2372 	return err;
2373 }
2374 
2375 static const struct got_error *
2376 queue_commits(struct tog_log_thread_args *a)
2377 {
2378 	const struct got_error *err = NULL;
2379 
2380 	/*
2381 	 * We keep all commits open throughout the lifetime of the log
2382 	 * view in order to avoid having to re-fetch commits from disk
2383 	 * while updating the display.
2384 	 */
2385 	do {
2386 		struct got_object_id id;
2387 		struct got_commit_object *commit;
2388 		struct commit_queue_entry *entry;
2389 		int limit_match = 0;
2390 		int errcode;
2391 
2392 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2393 		    NULL, NULL);
2394 		if (err)
2395 			break;
2396 
2397 		err = got_object_open_as_commit(&commit, a->repo, &id);
2398 		if (err)
2399 			break;
2400 		entry = alloc_commit_queue_entry(commit, &id);
2401 		if (entry == NULL) {
2402 			err = got_error_from_errno("alloc_commit_queue_entry");
2403 			break;
2404 		}
2405 
2406 		errcode = pthread_mutex_lock(&tog_mutex);
2407 		if (errcode) {
2408 			err = got_error_set_errno(errcode,
2409 			    "pthread_mutex_lock");
2410 			break;
2411 		}
2412 
2413 		entry->idx = a->real_commits->ncommits;
2414 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2415 		a->real_commits->ncommits++;
2416 
2417 		if (*a->limiting) {
2418 			err = match_commit(&limit_match, &id, commit,
2419 			    a->limit_regex);
2420 			if (err)
2421 				break;
2422 
2423 			if (limit_match) {
2424 				struct commit_queue_entry *matched;
2425 
2426 				matched = alloc_commit_queue_entry(
2427 				    entry->commit, entry->id);
2428 				if (matched == NULL) {
2429 					err = got_error_from_errno(
2430 					    "alloc_commit_queue_entry");
2431 					break;
2432 				}
2433 				matched->commit = entry->commit;
2434 				got_object_commit_retain(entry->commit);
2435 
2436 				matched->idx = a->limit_commits->ncommits;
2437 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2438 				    matched, entry);
2439 				a->limit_commits->ncommits++;
2440 			}
2441 
2442 			/*
2443 			 * This is how we signal log_thread() that we
2444 			 * have found a match, and that it should be
2445 			 * counted as a new entry for the view.
2446 			 */
2447 			a->limit_match = limit_match;
2448 		}
2449 
2450 		if (*a->searching == TOG_SEARCH_FORWARD &&
2451 		    !*a->search_next_done) {
2452 			int have_match;
2453 			err = match_commit(&have_match, &id, commit, a->regex);
2454 			if (err)
2455 				break;
2456 
2457 			if (*a->limiting) {
2458 				if (limit_match && have_match)
2459 					*a->search_next_done =
2460 					    TOG_SEARCH_HAVE_MORE;
2461 			} else if (have_match)
2462 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2463 		}
2464 
2465 		errcode = pthread_mutex_unlock(&tog_mutex);
2466 		if (errcode && err == NULL)
2467 			err = got_error_set_errno(errcode,
2468 			    "pthread_mutex_unlock");
2469 		if (err)
2470 			break;
2471 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2472 
2473 	return err;
2474 }
2475 
2476 static void
2477 select_commit(struct tog_log_view_state *s)
2478 {
2479 	struct commit_queue_entry *entry;
2480 	int ncommits = 0;
2481 
2482 	entry = s->first_displayed_entry;
2483 	while (entry) {
2484 		if (ncommits == s->selected) {
2485 			s->selected_entry = entry;
2486 			break;
2487 		}
2488 		entry = TAILQ_NEXT(entry, entry);
2489 		ncommits++;
2490 	}
2491 }
2492 
2493 static const struct got_error *
2494 draw_commits(struct tog_view *view)
2495 {
2496 	const struct got_error *err = NULL;
2497 	struct tog_log_view_state *s = &view->state.log;
2498 	struct commit_queue_entry *entry = s->selected_entry;
2499 	int limit = view->nlines;
2500 	int width;
2501 	int ncommits, author_cols = 4;
2502 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2503 	char *refs_str = NULL;
2504 	wchar_t *wline;
2505 	struct tog_color *tc;
2506 	static const size_t date_display_cols = 12;
2507 
2508 	if (view_is_hsplit_top(view))
2509 		--limit;  /* account for border */
2510 
2511 	if (s->selected_entry &&
2512 	    !(view->searching && view->search_next_done == 0)) {
2513 		struct got_reflist_head *refs;
2514 		err = got_object_id_str(&id_str, s->selected_entry->id);
2515 		if (err)
2516 			return err;
2517 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2518 		    s->selected_entry->id);
2519 		if (refs) {
2520 			err = build_refs_str(&refs_str, refs,
2521 			    s->selected_entry->id, s->repo);
2522 			if (err)
2523 				goto done;
2524 		}
2525 	}
2526 
2527 	if (s->thread_args.commits_needed == 0)
2528 		halfdelay(10); /* disable fast refresh */
2529 
2530 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2531 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2532 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2533 		    (view->searching && !view->search_next_done) ?
2534 		    "searching..." : "loading...") == -1) {
2535 			err = got_error_from_errno("asprintf");
2536 			goto done;
2537 		}
2538 	} else {
2539 		const char *search_str = NULL;
2540 		const char *limit_str = NULL;
2541 
2542 		if (view->searching) {
2543 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2544 				search_str = "no more matches";
2545 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2546 				search_str = "no matches found";
2547 			else if (!view->search_next_done)
2548 				search_str = "searching...";
2549 		}
2550 
2551 		if (s->limit_view && s->commits->ncommits == 0)
2552 			limit_str = "no matches found";
2553 
2554 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2555 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2556 		    search_str ? search_str : (refs_str ? refs_str : ""),
2557 		    limit_str ? limit_str : "") == -1) {
2558 			err = got_error_from_errno("asprintf");
2559 			goto done;
2560 		}
2561 	}
2562 
2563 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2564 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2565 		    "........................................",
2566 		    s->in_repo_path, ncommits_str) == -1) {
2567 			err = got_error_from_errno("asprintf");
2568 			header = NULL;
2569 			goto done;
2570 		}
2571 	} else if (asprintf(&header, "commit %s%s",
2572 	    id_str ? id_str : "........................................",
2573 	    ncommits_str) == -1) {
2574 		err = got_error_from_errno("asprintf");
2575 		header = NULL;
2576 		goto done;
2577 	}
2578 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2579 	if (err)
2580 		goto done;
2581 
2582 	werase(view->window);
2583 
2584 	if (view_needs_focus_indication(view))
2585 		wstandout(view->window);
2586 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2587 	if (tc)
2588 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2589 	waddwstr(view->window, wline);
2590 	while (width < view->ncols) {
2591 		waddch(view->window, ' ');
2592 		width++;
2593 	}
2594 	if (tc)
2595 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2596 	if (view_needs_focus_indication(view))
2597 		wstandend(view->window);
2598 	free(wline);
2599 	if (limit <= 1)
2600 		goto done;
2601 
2602 	/* Grow author column size if necessary, and set view->maxx. */
2603 	entry = s->first_displayed_entry;
2604 	ncommits = 0;
2605 	view->maxx = 0;
2606 	while (entry) {
2607 		struct got_commit_object *c = entry->commit;
2608 		char *author, *eol, *msg, *msg0;
2609 		wchar_t *wauthor, *wmsg;
2610 		int width;
2611 		if (ncommits >= limit - 1)
2612 			break;
2613 		if (s->use_committer)
2614 			author = strdup(got_object_commit_get_committer(c));
2615 		else
2616 			author = strdup(got_object_commit_get_author(c));
2617 		if (author == NULL) {
2618 			err = got_error_from_errno("strdup");
2619 			goto done;
2620 		}
2621 		err = format_author(&wauthor, &width, author, COLS,
2622 		    date_display_cols);
2623 		if (author_cols < width)
2624 			author_cols = width;
2625 		free(wauthor);
2626 		free(author);
2627 		if (err)
2628 			goto done;
2629 		err = got_object_commit_get_logmsg(&msg0, c);
2630 		if (err)
2631 			goto done;
2632 		msg = msg0;
2633 		while (*msg == '\n')
2634 			++msg;
2635 		if ((eol = strchr(msg, '\n')))
2636 			*eol = '\0';
2637 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2638 		    date_display_cols + author_cols, 0);
2639 		if (err)
2640 			goto done;
2641 		view->maxx = MAX(view->maxx, width);
2642 		free(msg0);
2643 		free(wmsg);
2644 		ncommits++;
2645 		entry = TAILQ_NEXT(entry, entry);
2646 	}
2647 
2648 	entry = s->first_displayed_entry;
2649 	s->last_displayed_entry = s->first_displayed_entry;
2650 	ncommits = 0;
2651 	while (entry) {
2652 		if (ncommits >= limit - 1)
2653 			break;
2654 		if (ncommits == s->selected)
2655 			wstandout(view->window);
2656 		err = draw_commit(view, entry->commit, entry->id,
2657 		    date_display_cols, author_cols);
2658 		if (ncommits == s->selected)
2659 			wstandend(view->window);
2660 		if (err)
2661 			goto done;
2662 		ncommits++;
2663 		s->last_displayed_entry = entry;
2664 		entry = TAILQ_NEXT(entry, entry);
2665 	}
2666 
2667 	view_border(view);
2668 done:
2669 	free(id_str);
2670 	free(refs_str);
2671 	free(ncommits_str);
2672 	free(header);
2673 	return err;
2674 }
2675 
2676 static void
2677 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2678 {
2679 	struct commit_queue_entry *entry;
2680 	int nscrolled = 0;
2681 
2682 	entry = TAILQ_FIRST(&s->commits->head);
2683 	if (s->first_displayed_entry == entry)
2684 		return;
2685 
2686 	entry = s->first_displayed_entry;
2687 	while (entry && nscrolled < maxscroll) {
2688 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2689 		if (entry) {
2690 			s->first_displayed_entry = entry;
2691 			nscrolled++;
2692 		}
2693 	}
2694 }
2695 
2696 static const struct got_error *
2697 trigger_log_thread(struct tog_view *view, int wait)
2698 {
2699 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2700 	int errcode;
2701 
2702 	halfdelay(1); /* fast refresh while loading commits */
2703 
2704 	while (!ta->log_complete && !tog_thread_error &&
2705 	    (ta->commits_needed > 0 || ta->load_all)) {
2706 		/* Wake the log thread. */
2707 		errcode = pthread_cond_signal(&ta->need_commits);
2708 		if (errcode)
2709 			return got_error_set_errno(errcode,
2710 			    "pthread_cond_signal");
2711 
2712 		/*
2713 		 * The mutex will be released while the view loop waits
2714 		 * in wgetch(), at which time the log thread will run.
2715 		 */
2716 		if (!wait)
2717 			break;
2718 
2719 		/* Display progress update in log view. */
2720 		show_log_view(view);
2721 		update_panels();
2722 		doupdate();
2723 
2724 		/* Wait right here while next commit is being loaded. */
2725 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2726 		if (errcode)
2727 			return got_error_set_errno(errcode,
2728 			    "pthread_cond_wait");
2729 
2730 		/* Display progress update in log view. */
2731 		show_log_view(view);
2732 		update_panels();
2733 		doupdate();
2734 	}
2735 
2736 	return NULL;
2737 }
2738 
2739 static const struct got_error *
2740 request_log_commits(struct tog_view *view)
2741 {
2742 	struct tog_log_view_state	*state = &view->state.log;
2743 	const struct got_error		*err = NULL;
2744 
2745 	if (state->thread_args.log_complete)
2746 		return NULL;
2747 
2748 	state->thread_args.commits_needed += view->nscrolled;
2749 	err = trigger_log_thread(view, 1);
2750 	view->nscrolled = 0;
2751 
2752 	return err;
2753 }
2754 
2755 static const struct got_error *
2756 log_scroll_down(struct tog_view *view, int maxscroll)
2757 {
2758 	struct tog_log_view_state *s = &view->state.log;
2759 	const struct got_error *err = NULL;
2760 	struct commit_queue_entry *pentry;
2761 	int nscrolled = 0, ncommits_needed;
2762 
2763 	if (s->last_displayed_entry == NULL)
2764 		return NULL;
2765 
2766 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2767 	if (s->commits->ncommits < ncommits_needed &&
2768 	    !s->thread_args.log_complete) {
2769 		/*
2770 		 * Ask the log thread for required amount of commits.
2771 		 */
2772 		s->thread_args.commits_needed +=
2773 		    ncommits_needed - s->commits->ncommits;
2774 		err = trigger_log_thread(view, 1);
2775 		if (err)
2776 			return err;
2777 	}
2778 
2779 	do {
2780 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2781 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2782 			break;
2783 
2784 		s->last_displayed_entry = pentry ?
2785 		    pentry : s->last_displayed_entry;
2786 
2787 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2788 		if (pentry == NULL)
2789 			break;
2790 		s->first_displayed_entry = pentry;
2791 	} while (++nscrolled < maxscroll);
2792 
2793 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2794 		view->nscrolled += nscrolled;
2795 	else
2796 		view->nscrolled = 0;
2797 
2798 	return err;
2799 }
2800 
2801 static const struct got_error *
2802 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2803     struct got_commit_object *commit, struct got_object_id *commit_id,
2804     struct tog_view *log_view, struct got_repository *repo)
2805 {
2806 	const struct got_error *err;
2807 	struct got_object_qid *parent_id;
2808 	struct tog_view *diff_view;
2809 
2810 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2811 	if (diff_view == NULL)
2812 		return got_error_from_errno("view_open");
2813 
2814 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2815 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2816 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2817 	if (err == NULL)
2818 		*new_view = diff_view;
2819 	return err;
2820 }
2821 
2822 static const struct got_error *
2823 tree_view_visit_subtree(struct tog_tree_view_state *s,
2824     struct got_tree_object *subtree)
2825 {
2826 	struct tog_parent_tree *parent;
2827 
2828 	parent = calloc(1, sizeof(*parent));
2829 	if (parent == NULL)
2830 		return got_error_from_errno("calloc");
2831 
2832 	parent->tree = s->tree;
2833 	parent->first_displayed_entry = s->first_displayed_entry;
2834 	parent->selected_entry = s->selected_entry;
2835 	parent->selected = s->selected;
2836 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2837 	s->tree = subtree;
2838 	s->selected = 0;
2839 	s->first_displayed_entry = NULL;
2840 	return NULL;
2841 }
2842 
2843 static const struct got_error *
2844 tree_view_walk_path(struct tog_tree_view_state *s,
2845     struct got_commit_object *commit, const char *path)
2846 {
2847 	const struct got_error *err = NULL;
2848 	struct got_tree_object *tree = NULL;
2849 	const char *p;
2850 	char *slash, *subpath = NULL;
2851 
2852 	/* Walk the path and open corresponding tree objects. */
2853 	p = path;
2854 	while (*p) {
2855 		struct got_tree_entry *te;
2856 		struct got_object_id *tree_id;
2857 		char *te_name;
2858 
2859 		while (p[0] == '/')
2860 			p++;
2861 
2862 		/* Ensure the correct subtree entry is selected. */
2863 		slash = strchr(p, '/');
2864 		if (slash == NULL)
2865 			te_name = strdup(p);
2866 		else
2867 			te_name = strndup(p, slash - p);
2868 		if (te_name == NULL) {
2869 			err = got_error_from_errno("strndup");
2870 			break;
2871 		}
2872 		te = got_object_tree_find_entry(s->tree, te_name);
2873 		if (te == NULL) {
2874 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2875 			free(te_name);
2876 			break;
2877 		}
2878 		free(te_name);
2879 		s->first_displayed_entry = s->selected_entry = te;
2880 
2881 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2882 			break; /* jump to this file's entry */
2883 
2884 		slash = strchr(p, '/');
2885 		if (slash)
2886 			subpath = strndup(path, slash - path);
2887 		else
2888 			subpath = strdup(path);
2889 		if (subpath == NULL) {
2890 			err = got_error_from_errno("strdup");
2891 			break;
2892 		}
2893 
2894 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2895 		    subpath);
2896 		if (err)
2897 			break;
2898 
2899 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2900 		free(tree_id);
2901 		if (err)
2902 			break;
2903 
2904 		err = tree_view_visit_subtree(s, tree);
2905 		if (err) {
2906 			got_object_tree_close(tree);
2907 			break;
2908 		}
2909 		if (slash == NULL)
2910 			break;
2911 		free(subpath);
2912 		subpath = NULL;
2913 		p = slash;
2914 	}
2915 
2916 	free(subpath);
2917 	return err;
2918 }
2919 
2920 static const struct got_error *
2921 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2922     struct commit_queue_entry *entry, const char *path,
2923     const char *head_ref_name, struct got_repository *repo)
2924 {
2925 	const struct got_error *err = NULL;
2926 	struct tog_tree_view_state *s;
2927 	struct tog_view *tree_view;
2928 
2929 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2930 	if (tree_view == NULL)
2931 		return got_error_from_errno("view_open");
2932 
2933 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2934 	if (err)
2935 		return err;
2936 	s = &tree_view->state.tree;
2937 
2938 	*new_view = tree_view;
2939 
2940 	if (got_path_is_root_dir(path))
2941 		return NULL;
2942 
2943 	return tree_view_walk_path(s, entry->commit, path);
2944 }
2945 
2946 static const struct got_error *
2947 block_signals_used_by_main_thread(void)
2948 {
2949 	sigset_t sigset;
2950 	int errcode;
2951 
2952 	if (sigemptyset(&sigset) == -1)
2953 		return got_error_from_errno("sigemptyset");
2954 
2955 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2956 	if (sigaddset(&sigset, SIGWINCH) == -1)
2957 		return got_error_from_errno("sigaddset");
2958 	if (sigaddset(&sigset, SIGCONT) == -1)
2959 		return got_error_from_errno("sigaddset");
2960 	if (sigaddset(&sigset, SIGINT) == -1)
2961 		return got_error_from_errno("sigaddset");
2962 	if (sigaddset(&sigset, SIGTERM) == -1)
2963 		return got_error_from_errno("sigaddset");
2964 
2965 	/* ncurses handles SIGTSTP */
2966 	if (sigaddset(&sigset, SIGTSTP) == -1)
2967 		return got_error_from_errno("sigaddset");
2968 
2969 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2970 	if (errcode)
2971 		return got_error_set_errno(errcode, "pthread_sigmask");
2972 
2973 	return NULL;
2974 }
2975 
2976 static void *
2977 log_thread(void *arg)
2978 {
2979 	const struct got_error *err = NULL;
2980 	int errcode = 0;
2981 	struct tog_log_thread_args *a = arg;
2982 	int done = 0;
2983 
2984 	/*
2985 	 * Sync startup with main thread such that we begin our
2986 	 * work once view_input() has released the mutex.
2987 	 */
2988 	errcode = pthread_mutex_lock(&tog_mutex);
2989 	if (errcode) {
2990 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2991 		return (void *)err;
2992 	}
2993 
2994 	err = block_signals_used_by_main_thread();
2995 	if (err) {
2996 		pthread_mutex_unlock(&tog_mutex);
2997 		goto done;
2998 	}
2999 
3000 	while (!done && !err && !tog_fatal_signal_received()) {
3001 		errcode = pthread_mutex_unlock(&tog_mutex);
3002 		if (errcode) {
3003 			err = got_error_set_errno(errcode,
3004 			    "pthread_mutex_unlock");
3005 			goto done;
3006 		}
3007 		err = queue_commits(a);
3008 		if (err) {
3009 			if (err->code != GOT_ERR_ITER_COMPLETED)
3010 				goto done;
3011 			err = NULL;
3012 			done = 1;
3013 		} else if (a->commits_needed > 0 && !a->load_all) {
3014 			if (*a->limiting) {
3015 				if (a->limit_match)
3016 					a->commits_needed--;
3017 			} else
3018 				a->commits_needed--;
3019 		}
3020 
3021 		errcode = pthread_mutex_lock(&tog_mutex);
3022 		if (errcode) {
3023 			err = got_error_set_errno(errcode,
3024 			    "pthread_mutex_lock");
3025 			goto done;
3026 		} else if (*a->quit)
3027 			done = 1;
3028 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3029 			*a->first_displayed_entry =
3030 			    TAILQ_FIRST(&a->limit_commits->head);
3031 			*a->selected_entry = *a->first_displayed_entry;
3032 		} else if (*a->first_displayed_entry == NULL) {
3033 			*a->first_displayed_entry =
3034 			    TAILQ_FIRST(&a->real_commits->head);
3035 			*a->selected_entry = *a->first_displayed_entry;
3036 		}
3037 
3038 		errcode = pthread_cond_signal(&a->commit_loaded);
3039 		if (errcode) {
3040 			err = got_error_set_errno(errcode,
3041 			    "pthread_cond_signal");
3042 			pthread_mutex_unlock(&tog_mutex);
3043 			goto done;
3044 		}
3045 
3046 		if (done)
3047 			a->commits_needed = 0;
3048 		else {
3049 			if (a->commits_needed == 0 && !a->load_all) {
3050 				errcode = pthread_cond_wait(&a->need_commits,
3051 				    &tog_mutex);
3052 				if (errcode) {
3053 					err = got_error_set_errno(errcode,
3054 					    "pthread_cond_wait");
3055 					pthread_mutex_unlock(&tog_mutex);
3056 					goto done;
3057 				}
3058 				if (*a->quit)
3059 					done = 1;
3060 			}
3061 		}
3062 	}
3063 	a->log_complete = 1;
3064 	errcode = pthread_mutex_unlock(&tog_mutex);
3065 	if (errcode)
3066 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3067 done:
3068 	if (err) {
3069 		tog_thread_error = 1;
3070 		pthread_cond_signal(&a->commit_loaded);
3071 	}
3072 	return (void *)err;
3073 }
3074 
3075 static const struct got_error *
3076 stop_log_thread(struct tog_log_view_state *s)
3077 {
3078 	const struct got_error *err = NULL, *thread_err = NULL;
3079 	int errcode;
3080 
3081 	if (s->thread) {
3082 		s->quit = 1;
3083 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3084 		if (errcode)
3085 			return got_error_set_errno(errcode,
3086 			    "pthread_cond_signal");
3087 		errcode = pthread_mutex_unlock(&tog_mutex);
3088 		if (errcode)
3089 			return got_error_set_errno(errcode,
3090 			    "pthread_mutex_unlock");
3091 		errcode = pthread_join(s->thread, (void **)&thread_err);
3092 		if (errcode)
3093 			return got_error_set_errno(errcode, "pthread_join");
3094 		errcode = pthread_mutex_lock(&tog_mutex);
3095 		if (errcode)
3096 			return got_error_set_errno(errcode,
3097 			    "pthread_mutex_lock");
3098 		s->thread = 0; //NULL;
3099 	}
3100 
3101 	if (s->thread_args.repo) {
3102 		err = got_repo_close(s->thread_args.repo);
3103 		s->thread_args.repo = NULL;
3104 	}
3105 
3106 	if (s->thread_args.pack_fds) {
3107 		const struct got_error *pack_err =
3108 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3109 		if (err == NULL)
3110 			err = pack_err;
3111 		s->thread_args.pack_fds = NULL;
3112 	}
3113 
3114 	if (s->thread_args.graph) {
3115 		got_commit_graph_close(s->thread_args.graph);
3116 		s->thread_args.graph = NULL;
3117 	}
3118 
3119 	return err ? err : thread_err;
3120 }
3121 
3122 static const struct got_error *
3123 close_log_view(struct tog_view *view)
3124 {
3125 	const struct got_error *err = NULL;
3126 	struct tog_log_view_state *s = &view->state.log;
3127 	int errcode;
3128 
3129 	err = stop_log_thread(s);
3130 
3131 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3132 	if (errcode && err == NULL)
3133 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3134 
3135 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3136 	if (errcode && err == NULL)
3137 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3138 
3139 	free_commits(&s->limit_commits);
3140 	free_commits(&s->real_commits);
3141 	free(s->in_repo_path);
3142 	s->in_repo_path = NULL;
3143 	free(s->start_id);
3144 	s->start_id = NULL;
3145 	free(s->head_ref_name);
3146 	s->head_ref_name = NULL;
3147 	return err;
3148 }
3149 
3150 /*
3151  * We use two queues to implement the limit feature: first consists of
3152  * commits matching the current limit_regex; second is the real queue
3153  * of all known commits (real_commits). When the user starts limiting,
3154  * we swap queues such that all movement and displaying functionality
3155  * works with very slight change.
3156  */
3157 static const struct got_error *
3158 limit_log_view(struct tog_view *view)
3159 {
3160 	struct tog_log_view_state *s = &view->state.log;
3161 	struct commit_queue_entry *entry;
3162 	struct tog_view	*v = view;
3163 	const struct got_error *err = NULL;
3164 	char pattern[1024];
3165 	int ret;
3166 
3167 	if (view_is_hsplit_top(view))
3168 		v = view->child;
3169 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3170 		v = view->parent;
3171 
3172 	/* Get the pattern */
3173 	wmove(v->window, v->nlines - 1, 0);
3174 	wclrtoeol(v->window);
3175 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3176 	nodelay(v->window, FALSE);
3177 	nocbreak();
3178 	echo();
3179 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3180 	cbreak();
3181 	noecho();
3182 	nodelay(v->window, TRUE);
3183 	if (ret == ERR)
3184 		return NULL;
3185 
3186 	if (*pattern == '\0') {
3187 		/*
3188 		 * Safety measure for the situation where the user
3189 		 * resets limit without previously limiting anything.
3190 		 */
3191 		if (!s->limit_view)
3192 			return NULL;
3193 
3194 		/*
3195 		 * User could have pressed Ctrl+L, which refreshed the
3196 		 * commit queues, it means we can't save previously
3197 		 * (before limit took place) displayed entries,
3198 		 * because they would point to already free'ed memory,
3199 		 * so we are forced to always select first entry of
3200 		 * the queue.
3201 		 */
3202 		s->commits = &s->real_commits;
3203 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3204 		s->selected_entry = s->first_displayed_entry;
3205 		s->selected = 0;
3206 		s->limit_view = 0;
3207 
3208 		return NULL;
3209 	}
3210 
3211 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3212 		return NULL;
3213 
3214 	s->limit_view = 1;
3215 
3216 	/* Clear the screen while loading limit view */
3217 	s->first_displayed_entry = NULL;
3218 	s->last_displayed_entry = NULL;
3219 	s->selected_entry = NULL;
3220 	s->commits = &s->limit_commits;
3221 
3222 	/* Prepare limit queue for new search */
3223 	free_commits(&s->limit_commits);
3224 	s->limit_commits.ncommits = 0;
3225 
3226 	/* First process commits, which are in queue already */
3227 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3228 		int have_match = 0;
3229 
3230 		err = match_commit(&have_match, entry->id,
3231 		    entry->commit, &s->limit_regex);
3232 		if (err)
3233 			return err;
3234 
3235 		if (have_match) {
3236 			struct commit_queue_entry *matched;
3237 
3238 			matched = alloc_commit_queue_entry(entry->commit,
3239 			    entry->id);
3240 			if (matched == NULL) {
3241 				err = got_error_from_errno(
3242 				    "alloc_commit_queue_entry");
3243 				break;
3244 			}
3245 			matched->commit = entry->commit;
3246 			got_object_commit_retain(entry->commit);
3247 
3248 			matched->idx = s->limit_commits.ncommits;
3249 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3250 			    matched, entry);
3251 			s->limit_commits.ncommits++;
3252 		}
3253 	}
3254 
3255 	/* Second process all the commits, until we fill the screen */
3256 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3257 	    !s->thread_args.log_complete) {
3258 		s->thread_args.commits_needed +=
3259 		    view->nlines - s->limit_commits.ncommits - 1;
3260 		err = trigger_log_thread(view, 1);
3261 		if (err)
3262 			return err;
3263 	}
3264 
3265 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3266 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3267 	s->selected = 0;
3268 
3269 	return NULL;
3270 }
3271 
3272 static const struct got_error *
3273 search_start_log_view(struct tog_view *view)
3274 {
3275 	struct tog_log_view_state *s = &view->state.log;
3276 
3277 	s->matched_entry = NULL;
3278 	s->search_entry = NULL;
3279 	return NULL;
3280 }
3281 
3282 static const struct got_error *
3283 search_next_log_view(struct tog_view *view)
3284 {
3285 	const struct got_error *err = NULL;
3286 	struct tog_log_view_state *s = &view->state.log;
3287 	struct commit_queue_entry *entry;
3288 
3289 	/* Display progress update in log view. */
3290 	show_log_view(view);
3291 	update_panels();
3292 	doupdate();
3293 
3294 	if (s->search_entry) {
3295 		int errcode, ch;
3296 		errcode = pthread_mutex_unlock(&tog_mutex);
3297 		if (errcode)
3298 			return got_error_set_errno(errcode,
3299 			    "pthread_mutex_unlock");
3300 		ch = wgetch(view->window);
3301 		errcode = pthread_mutex_lock(&tog_mutex);
3302 		if (errcode)
3303 			return got_error_set_errno(errcode,
3304 			    "pthread_mutex_lock");
3305 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3306 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3307 			return NULL;
3308 		}
3309 		if (view->searching == TOG_SEARCH_FORWARD)
3310 			entry = TAILQ_NEXT(s->search_entry, entry);
3311 		else
3312 			entry = TAILQ_PREV(s->search_entry,
3313 			    commit_queue_head, entry);
3314 	} else if (s->matched_entry) {
3315 		/*
3316 		 * If the user has moved the cursor after we hit a match,
3317 		 * the position from where we should continue searching
3318 		 * might have changed.
3319 		 */
3320 		if (view->searching == TOG_SEARCH_FORWARD)
3321 			entry = TAILQ_NEXT(s->selected_entry, entry);
3322 		else
3323 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3324 			    entry);
3325 	} else {
3326 		entry = s->selected_entry;
3327 	}
3328 
3329 	while (1) {
3330 		int have_match = 0;
3331 
3332 		if (entry == NULL) {
3333 			if (s->thread_args.log_complete ||
3334 			    view->searching == TOG_SEARCH_BACKWARD) {
3335 				view->search_next_done =
3336 				    (s->matched_entry == NULL ?
3337 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3338 				s->search_entry = NULL;
3339 				return NULL;
3340 			}
3341 			/*
3342 			 * Poke the log thread for more commits and return,
3343 			 * allowing the main loop to make progress. Search
3344 			 * will resume at s->search_entry once we come back.
3345 			 */
3346 			s->thread_args.commits_needed++;
3347 			return trigger_log_thread(view, 0);
3348 		}
3349 
3350 		err = match_commit(&have_match, entry->id, entry->commit,
3351 		    &view->regex);
3352 		if (err)
3353 			break;
3354 		if (have_match) {
3355 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3356 			s->matched_entry = entry;
3357 			break;
3358 		}
3359 
3360 		s->search_entry = entry;
3361 		if (view->searching == TOG_SEARCH_FORWARD)
3362 			entry = TAILQ_NEXT(entry, entry);
3363 		else
3364 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3365 	}
3366 
3367 	if (s->matched_entry) {
3368 		int cur = s->selected_entry->idx;
3369 		while (cur < s->matched_entry->idx) {
3370 			err = input_log_view(NULL, view, KEY_DOWN);
3371 			if (err)
3372 				return err;
3373 			cur++;
3374 		}
3375 		while (cur > s->matched_entry->idx) {
3376 			err = input_log_view(NULL, view, KEY_UP);
3377 			if (err)
3378 				return err;
3379 			cur--;
3380 		}
3381 	}
3382 
3383 	s->search_entry = NULL;
3384 
3385 	return NULL;
3386 }
3387 
3388 static const struct got_error *
3389 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3390     struct got_repository *repo, const char *head_ref_name,
3391     const char *in_repo_path, int log_branches)
3392 {
3393 	const struct got_error *err = NULL;
3394 	struct tog_log_view_state *s = &view->state.log;
3395 	struct got_repository *thread_repo = NULL;
3396 	struct got_commit_graph *thread_graph = NULL;
3397 	int errcode;
3398 
3399 	if (in_repo_path != s->in_repo_path) {
3400 		free(s->in_repo_path);
3401 		s->in_repo_path = strdup(in_repo_path);
3402 		if (s->in_repo_path == NULL)
3403 			return got_error_from_errno("strdup");
3404 	}
3405 
3406 	/* The commit queue only contains commits being displayed. */
3407 	TAILQ_INIT(&s->real_commits.head);
3408 	s->real_commits.ncommits = 0;
3409 	s->commits = &s->real_commits;
3410 
3411 	TAILQ_INIT(&s->limit_commits.head);
3412 	s->limit_view = 0;
3413 	s->limit_commits.ncommits = 0;
3414 
3415 	s->repo = repo;
3416 	if (head_ref_name) {
3417 		s->head_ref_name = strdup(head_ref_name);
3418 		if (s->head_ref_name == NULL) {
3419 			err = got_error_from_errno("strdup");
3420 			goto done;
3421 		}
3422 	}
3423 	s->start_id = got_object_id_dup(start_id);
3424 	if (s->start_id == NULL) {
3425 		err = got_error_from_errno("got_object_id_dup");
3426 		goto done;
3427 	}
3428 	s->log_branches = log_branches;
3429 	s->use_committer = 1;
3430 
3431 	STAILQ_INIT(&s->colors);
3432 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3433 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3434 		    get_color_value("TOG_COLOR_COMMIT"));
3435 		if (err)
3436 			goto done;
3437 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3438 		    get_color_value("TOG_COLOR_AUTHOR"));
3439 		if (err) {
3440 			free_colors(&s->colors);
3441 			goto done;
3442 		}
3443 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3444 		    get_color_value("TOG_COLOR_DATE"));
3445 		if (err) {
3446 			free_colors(&s->colors);
3447 			goto done;
3448 		}
3449 	}
3450 
3451 	view->show = show_log_view;
3452 	view->input = input_log_view;
3453 	view->resize = resize_log_view;
3454 	view->close = close_log_view;
3455 	view->search_start = search_start_log_view;
3456 	view->search_next = search_next_log_view;
3457 
3458 	if (s->thread_args.pack_fds == NULL) {
3459 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3460 		if (err)
3461 			goto done;
3462 	}
3463 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3464 	    s->thread_args.pack_fds);
3465 	if (err)
3466 		goto done;
3467 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3468 	    !s->log_branches);
3469 	if (err)
3470 		goto done;
3471 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3472 	    s->repo, NULL, NULL);
3473 	if (err)
3474 		goto done;
3475 
3476 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3477 	if (errcode) {
3478 		err = got_error_set_errno(errcode, "pthread_cond_init");
3479 		goto done;
3480 	}
3481 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3482 	if (errcode) {
3483 		err = got_error_set_errno(errcode, "pthread_cond_init");
3484 		goto done;
3485 	}
3486 
3487 	s->thread_args.commits_needed = view->nlines;
3488 	s->thread_args.graph = thread_graph;
3489 	s->thread_args.real_commits = &s->real_commits;
3490 	s->thread_args.limit_commits = &s->limit_commits;
3491 	s->thread_args.in_repo_path = s->in_repo_path;
3492 	s->thread_args.start_id = s->start_id;
3493 	s->thread_args.repo = thread_repo;
3494 	s->thread_args.log_complete = 0;
3495 	s->thread_args.quit = &s->quit;
3496 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3497 	s->thread_args.selected_entry = &s->selected_entry;
3498 	s->thread_args.searching = &view->searching;
3499 	s->thread_args.search_next_done = &view->search_next_done;
3500 	s->thread_args.regex = &view->regex;
3501 	s->thread_args.limiting = &s->limit_view;
3502 	s->thread_args.limit_regex = &s->limit_regex;
3503 	s->thread_args.limit_commits = &s->limit_commits;
3504 done:
3505 	if (err)
3506 		close_log_view(view);
3507 	return err;
3508 }
3509 
3510 static const struct got_error *
3511 show_log_view(struct tog_view *view)
3512 {
3513 	const struct got_error *err;
3514 	struct tog_log_view_state *s = &view->state.log;
3515 
3516 	if (s->thread == 0) { //NULL) {
3517 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3518 		    &s->thread_args);
3519 		if (errcode)
3520 			return got_error_set_errno(errcode, "pthread_create");
3521 		if (s->thread_args.commits_needed > 0) {
3522 			err = trigger_log_thread(view, 1);
3523 			if (err)
3524 				return err;
3525 		}
3526 	}
3527 
3528 	return draw_commits(view);
3529 }
3530 
3531 static void
3532 log_move_cursor_up(struct tog_view *view, int page, int home)
3533 {
3534 	struct tog_log_view_state *s = &view->state.log;
3535 
3536 	if (s->first_displayed_entry == NULL)
3537 		return;
3538 	if (s->selected_entry->idx == 0)
3539 		view->count = 0;
3540 
3541 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3542 	    || home)
3543 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3544 
3545 	if (!page && !home && s->selected > 0)
3546 		--s->selected;
3547 	else
3548 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3549 
3550 	select_commit(s);
3551 	return;
3552 }
3553 
3554 static const struct got_error *
3555 log_move_cursor_down(struct tog_view *view, int page)
3556 {
3557 	struct tog_log_view_state	*s = &view->state.log;
3558 	const struct got_error		*err = NULL;
3559 	int				 eos = view->nlines - 2;
3560 
3561 	if (s->first_displayed_entry == NULL)
3562 		return NULL;
3563 
3564 	if (s->thread_args.log_complete &&
3565 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3566 		return NULL;
3567 
3568 	if (view_is_hsplit_top(view))
3569 		--eos;  /* border consumes the last line */
3570 
3571 	if (!page) {
3572 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3573 			++s->selected;
3574 		else
3575 			err = log_scroll_down(view, 1);
3576 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3577 		struct commit_queue_entry *entry;
3578 		int n;
3579 
3580 		s->selected = 0;
3581 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3582 		s->last_displayed_entry = entry;
3583 		for (n = 0; n <= eos; n++) {
3584 			if (entry == NULL)
3585 				break;
3586 			s->first_displayed_entry = entry;
3587 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3588 		}
3589 		if (n > 0)
3590 			s->selected = n - 1;
3591 	} else {
3592 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3593 		    s->thread_args.log_complete)
3594 			s->selected += MIN(page,
3595 			    s->commits->ncommits - s->selected_entry->idx - 1);
3596 		else
3597 			err = log_scroll_down(view, page);
3598 	}
3599 	if (err)
3600 		return err;
3601 
3602 	/*
3603 	 * We might necessarily overshoot in horizontal
3604 	 * splits; if so, select the last displayed commit.
3605 	 */
3606 	if (s->first_displayed_entry && s->last_displayed_entry) {
3607 		s->selected = MIN(s->selected,
3608 		    s->last_displayed_entry->idx -
3609 		    s->first_displayed_entry->idx);
3610 	}
3611 
3612 	select_commit(s);
3613 
3614 	if (s->thread_args.log_complete &&
3615 	    s->selected_entry->idx == s->commits->ncommits - 1)
3616 		view->count = 0;
3617 
3618 	return NULL;
3619 }
3620 
3621 static void
3622 view_get_split(struct tog_view *view, int *y, int *x)
3623 {
3624 	*x = 0;
3625 	*y = 0;
3626 
3627 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3628 		if (view->child && view->child->resized_y)
3629 			*y = view->child->resized_y;
3630 		else if (view->resized_y)
3631 			*y = view->resized_y;
3632 		else
3633 			*y = view_split_begin_y(view->lines);
3634 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3635 		if (view->child && view->child->resized_x)
3636 			*x = view->child->resized_x;
3637 		else if (view->resized_x)
3638 			*x = view->resized_x;
3639 		else
3640 			*x = view_split_begin_x(view->begin_x);
3641 	}
3642 }
3643 
3644 /* Split view horizontally at y and offset view->state->selected line. */
3645 static const struct got_error *
3646 view_init_hsplit(struct tog_view *view, int y)
3647 {
3648 	const struct got_error *err = NULL;
3649 
3650 	view->nlines = y;
3651 	view->ncols = COLS;
3652 	err = view_resize(view);
3653 	if (err)
3654 		return err;
3655 
3656 	err = offset_selection_down(view);
3657 
3658 	return err;
3659 }
3660 
3661 static const struct got_error *
3662 log_goto_line(struct tog_view *view, int nlines)
3663 {
3664 	const struct got_error		*err = NULL;
3665 	struct tog_log_view_state	*s = &view->state.log;
3666 	int				 g, idx = s->selected_entry->idx;
3667 
3668 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3669 		return NULL;
3670 
3671 	g = view->gline;
3672 	view->gline = 0;
3673 
3674 	if (g >= s->first_displayed_entry->idx + 1 &&
3675 	    g <= s->last_displayed_entry->idx + 1 &&
3676 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3677 		s->selected = g - s->first_displayed_entry->idx - 1;
3678 		select_commit(s);
3679 		return NULL;
3680 	}
3681 
3682 	if (idx + 1 < g) {
3683 		err = log_move_cursor_down(view, g - idx - 1);
3684 		if (!err && g > s->selected_entry->idx + 1)
3685 			err = log_move_cursor_down(view,
3686 			    g - s->first_displayed_entry->idx - 1);
3687 		if (err)
3688 			return err;
3689 	} else if (idx + 1 > g)
3690 		log_move_cursor_up(view, idx - g + 1, 0);
3691 
3692 	if (g < nlines && s->first_displayed_entry->idx == 0)
3693 		s->selected = g - 1;
3694 
3695 	select_commit(s);
3696 	return NULL;
3697 
3698 }
3699 
3700 static const struct got_error *
3701 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3702 {
3703 	const struct got_error *err = NULL;
3704 	struct tog_log_view_state *s = &view->state.log;
3705 	int eos, nscroll;
3706 
3707 	if (s->thread_args.load_all) {
3708 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3709 			s->thread_args.load_all = 0;
3710 		else if (s->thread_args.log_complete) {
3711 			err = log_move_cursor_down(view, s->commits->ncommits);
3712 			s->thread_args.load_all = 0;
3713 		}
3714 		if (err)
3715 			return err;
3716 	}
3717 
3718 	eos = nscroll = view->nlines - 1;
3719 	if (view_is_hsplit_top(view))
3720 		--eos;  /* border */
3721 
3722 	if (view->gline)
3723 		return log_goto_line(view, eos);
3724 
3725 	switch (ch) {
3726 	case '&':
3727 		err = limit_log_view(view);
3728 		break;
3729 	case 'q':
3730 		s->quit = 1;
3731 		break;
3732 	case '0':
3733 		view->x = 0;
3734 		break;
3735 	case '$':
3736 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3737 		view->count = 0;
3738 		break;
3739 	case KEY_RIGHT:
3740 	case 'l':
3741 		if (view->x + view->ncols / 2 < view->maxx)
3742 			view->x += 2;  /* move two columns right */
3743 		else
3744 			view->count = 0;
3745 		break;
3746 	case KEY_LEFT:
3747 	case 'h':
3748 		view->x -= MIN(view->x, 2);  /* move two columns back */
3749 		if (view->x <= 0)
3750 			view->count = 0;
3751 		break;
3752 	case 'k':
3753 	case KEY_UP:
3754 	case '<':
3755 	case ',':
3756 	case CTRL('p'):
3757 		log_move_cursor_up(view, 0, 0);
3758 		break;
3759 	case 'g':
3760 	case '=':
3761 	case KEY_HOME:
3762 		log_move_cursor_up(view, 0, 1);
3763 		view->count = 0;
3764 		break;
3765 	case CTRL('u'):
3766 	case 'u':
3767 		nscroll /= 2;
3768 		/* FALL THROUGH */
3769 	case KEY_PPAGE:
3770 	case CTRL('b'):
3771 	case 'b':
3772 		log_move_cursor_up(view, nscroll, 0);
3773 		break;
3774 	case 'j':
3775 	case KEY_DOWN:
3776 	case '>':
3777 	case '.':
3778 	case CTRL('n'):
3779 		err = log_move_cursor_down(view, 0);
3780 		break;
3781 	case '@':
3782 		s->use_committer = !s->use_committer;
3783 		view->action = s->use_committer ?
3784 		    "show committer" : "show commit author";
3785 		break;
3786 	case 'G':
3787 	case '*':
3788 	case KEY_END: {
3789 		/* We don't know yet how many commits, so we're forced to
3790 		 * traverse them all. */
3791 		view->count = 0;
3792 		s->thread_args.load_all = 1;
3793 		if (!s->thread_args.log_complete)
3794 			return trigger_log_thread(view, 0);
3795 		err = log_move_cursor_down(view, s->commits->ncommits);
3796 		s->thread_args.load_all = 0;
3797 		break;
3798 	}
3799 	case CTRL('d'):
3800 	case 'd':
3801 		nscroll /= 2;
3802 		/* FALL THROUGH */
3803 	case KEY_NPAGE:
3804 	case CTRL('f'):
3805 	case 'f':
3806 	case ' ':
3807 		err = log_move_cursor_down(view, nscroll);
3808 		break;
3809 	case KEY_RESIZE:
3810 		if (s->selected > view->nlines - 2)
3811 			s->selected = view->nlines - 2;
3812 		if (s->selected > s->commits->ncommits - 1)
3813 			s->selected = s->commits->ncommits - 1;
3814 		select_commit(s);
3815 		if (s->commits->ncommits < view->nlines - 1 &&
3816 		    !s->thread_args.log_complete) {
3817 			s->thread_args.commits_needed += (view->nlines - 1) -
3818 			    s->commits->ncommits;
3819 			err = trigger_log_thread(view, 1);
3820 		}
3821 		break;
3822 	case KEY_ENTER:
3823 	case '\r':
3824 		view->count = 0;
3825 		if (s->selected_entry == NULL)
3826 			break;
3827 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3828 		break;
3829 	case 'T':
3830 		view->count = 0;
3831 		if (s->selected_entry == NULL)
3832 			break;
3833 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3834 		break;
3835 	case KEY_BACKSPACE:
3836 	case CTRL('l'):
3837 	case 'B':
3838 		view->count = 0;
3839 		if (ch == KEY_BACKSPACE &&
3840 		    got_path_is_root_dir(s->in_repo_path))
3841 			break;
3842 		err = stop_log_thread(s);
3843 		if (err)
3844 			return err;
3845 		if (ch == KEY_BACKSPACE) {
3846 			char *parent_path;
3847 			err = got_path_dirname(&parent_path, s->in_repo_path);
3848 			if (err)
3849 				return err;
3850 			free(s->in_repo_path);
3851 			s->in_repo_path = parent_path;
3852 			s->thread_args.in_repo_path = s->in_repo_path;
3853 		} else if (ch == CTRL('l')) {
3854 			struct got_object_id *start_id;
3855 			err = got_repo_match_object_id(&start_id, NULL,
3856 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3857 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3858 			if (err) {
3859 				if (s->head_ref_name == NULL ||
3860 				    err->code != GOT_ERR_NOT_REF)
3861 					return err;
3862 				/* Try to cope with deleted references. */
3863 				free(s->head_ref_name);
3864 				s->head_ref_name = NULL;
3865 				err = got_repo_match_object_id(&start_id,
3866 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3867 				    &tog_refs, s->repo);
3868 				if (err)
3869 					return err;
3870 			}
3871 			free(s->start_id);
3872 			s->start_id = start_id;
3873 			s->thread_args.start_id = s->start_id;
3874 		} else /* 'B' */
3875 			s->log_branches = !s->log_branches;
3876 
3877 		if (s->thread_args.pack_fds == NULL) {
3878 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3879 			if (err)
3880 				return err;
3881 		}
3882 		err = got_repo_open(&s->thread_args.repo,
3883 		    got_repo_get_path(s->repo), NULL,
3884 		    s->thread_args.pack_fds);
3885 		if (err)
3886 			return err;
3887 		tog_free_refs();
3888 		err = tog_load_refs(s->repo, 0);
3889 		if (err)
3890 			return err;
3891 		err = got_commit_graph_open(&s->thread_args.graph,
3892 		    s->in_repo_path, !s->log_branches);
3893 		if (err)
3894 			return err;
3895 		err = got_commit_graph_iter_start(s->thread_args.graph,
3896 		    s->start_id, s->repo, NULL, NULL);
3897 		if (err)
3898 			return err;
3899 		free_commits(&s->real_commits);
3900 		free_commits(&s->limit_commits);
3901 		s->first_displayed_entry = NULL;
3902 		s->last_displayed_entry = NULL;
3903 		s->selected_entry = NULL;
3904 		s->selected = 0;
3905 		s->thread_args.log_complete = 0;
3906 		s->quit = 0;
3907 		s->thread_args.commits_needed = view->lines;
3908 		s->matched_entry = NULL;
3909 		s->search_entry = NULL;
3910 		view->offset = 0;
3911 		break;
3912 	case 'R':
3913 		view->count = 0;
3914 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3915 		break;
3916 	default:
3917 		view->count = 0;
3918 		break;
3919 	}
3920 
3921 	return err;
3922 }
3923 
3924 static const struct got_error *
3925 apply_unveil(const char *repo_path, const char *worktree_path)
3926 {
3927 	const struct got_error *error;
3928 
3929 #ifdef PROFILE
3930 	if (unveil("gmon.out", "rwc") != 0)
3931 		return got_error_from_errno2("unveil", "gmon.out");
3932 #endif
3933 	if (repo_path && unveil(repo_path, "r") != 0)
3934 		return got_error_from_errno2("unveil", repo_path);
3935 
3936 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3937 		return got_error_from_errno2("unveil", worktree_path);
3938 
3939 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3940 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3941 
3942 	error = got_privsep_unveil_exec_helpers();
3943 	if (error != NULL)
3944 		return error;
3945 
3946 	if (unveil(NULL, NULL) != 0)
3947 		return got_error_from_errno("unveil");
3948 
3949 	return NULL;
3950 }
3951 
3952 static void
3953 init_curses(void)
3954 {
3955 	/*
3956 	 * Override default signal handlers before starting ncurses.
3957 	 * This should prevent ncurses from installing its own
3958 	 * broken cleanup() signal handler.
3959 	 */
3960 	signal(SIGWINCH, tog_sigwinch);
3961 	signal(SIGPIPE, tog_sigpipe);
3962 	signal(SIGCONT, tog_sigcont);
3963 	signal(SIGINT, tog_sigint);
3964 	signal(SIGTERM, tog_sigterm);
3965 
3966 	initscr();
3967 	cbreak();
3968 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3969 	noecho();
3970 	nonl();
3971 	intrflush(stdscr, FALSE);
3972 	keypad(stdscr, TRUE);
3973 	curs_set(0);
3974 	if (getenv("TOG_COLORS") != NULL) {
3975 		start_color();
3976 		use_default_colors();
3977 	}
3978 }
3979 
3980 static const struct got_error *
3981 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3982     struct got_repository *repo, struct got_worktree *worktree)
3983 {
3984 	const struct got_error *err = NULL;
3985 
3986 	if (argc == 0) {
3987 		*in_repo_path = strdup("/");
3988 		if (*in_repo_path == NULL)
3989 			return got_error_from_errno("strdup");
3990 		return NULL;
3991 	}
3992 
3993 	if (worktree) {
3994 		const char *prefix = got_worktree_get_path_prefix(worktree);
3995 		char *p;
3996 
3997 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3998 		if (err)
3999 			return err;
4000 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4001 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4002 		    p) == -1) {
4003 			err = got_error_from_errno("asprintf");
4004 			*in_repo_path = NULL;
4005 		}
4006 		free(p);
4007 	} else
4008 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4009 
4010 	return err;
4011 }
4012 
4013 static const struct got_error *
4014 cmd_log(int argc, char *argv[])
4015 {
4016 	const struct got_error *error;
4017 	struct got_repository *repo = NULL;
4018 	struct got_worktree *worktree = NULL;
4019 	struct got_object_id *start_id = NULL;
4020 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4021 	char *start_commit = NULL, *label = NULL;
4022 	struct got_reference *ref = NULL;
4023 	const char *head_ref_name = NULL;
4024 	int ch, log_branches = 0;
4025 	struct tog_view *view;
4026 	int *pack_fds = NULL;
4027 
4028 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4029 		switch (ch) {
4030 		case 'b':
4031 			log_branches = 1;
4032 			break;
4033 		case 'c':
4034 			start_commit = optarg;
4035 			break;
4036 		case 'r':
4037 			repo_path = realpath(optarg, NULL);
4038 			if (repo_path == NULL)
4039 				return got_error_from_errno2("realpath",
4040 				    optarg);
4041 			break;
4042 		default:
4043 			usage_log();
4044 			/* NOTREACHED */
4045 		}
4046 	}
4047 
4048 	argc -= optind;
4049 	argv += optind;
4050 
4051 	if (argc > 1)
4052 		usage_log();
4053 
4054 	error = got_repo_pack_fds_open(&pack_fds);
4055 	if (error != NULL)
4056 		goto done;
4057 
4058 	if (repo_path == NULL) {
4059 		cwd = getcwd(NULL, 0);
4060 		if (cwd == NULL)
4061 			return got_error_from_errno("getcwd");
4062 		error = got_worktree_open(&worktree, cwd);
4063 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4064 			goto done;
4065 		if (worktree)
4066 			repo_path =
4067 			    strdup(got_worktree_get_repo_path(worktree));
4068 		else
4069 			repo_path = strdup(cwd);
4070 		if (repo_path == NULL) {
4071 			error = got_error_from_errno("strdup");
4072 			goto done;
4073 		}
4074 	}
4075 
4076 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4077 	if (error != NULL)
4078 		goto done;
4079 
4080 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4081 	    repo, worktree);
4082 	if (error)
4083 		goto done;
4084 
4085 	init_curses();
4086 
4087 	error = apply_unveil(got_repo_get_path(repo),
4088 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4089 	if (error)
4090 		goto done;
4091 
4092 	/* already loaded by tog_log_with_path()? */
4093 	if (TAILQ_EMPTY(&tog_refs)) {
4094 		error = tog_load_refs(repo, 0);
4095 		if (error)
4096 			goto done;
4097 	}
4098 
4099 	if (start_commit == NULL) {
4100 		error = got_repo_match_object_id(&start_id, &label,
4101 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4102 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4103 		if (error)
4104 			goto done;
4105 		head_ref_name = label;
4106 	} else {
4107 		error = got_ref_open(&ref, repo, start_commit, 0);
4108 		if (error == NULL)
4109 			head_ref_name = got_ref_get_name(ref);
4110 		else if (error->code != GOT_ERR_NOT_REF)
4111 			goto done;
4112 		error = got_repo_match_object_id(&start_id, NULL,
4113 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4114 		if (error)
4115 			goto done;
4116 	}
4117 
4118 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4119 	if (view == NULL) {
4120 		error = got_error_from_errno("view_open");
4121 		goto done;
4122 	}
4123 	error = open_log_view(view, start_id, repo, head_ref_name,
4124 	    in_repo_path, log_branches);
4125 	if (error)
4126 		goto done;
4127 	if (worktree) {
4128 		/* Release work tree lock. */
4129 		got_worktree_close(worktree);
4130 		worktree = NULL;
4131 	}
4132 	error = view_loop(view);
4133 done:
4134 	free(in_repo_path);
4135 	free(repo_path);
4136 	free(cwd);
4137 	free(start_id);
4138 	free(label);
4139 	if (ref)
4140 		got_ref_close(ref);
4141 	if (repo) {
4142 		const struct got_error *close_err = got_repo_close(repo);
4143 		if (error == NULL)
4144 			error = close_err;
4145 	}
4146 	if (worktree)
4147 		got_worktree_close(worktree);
4148 	if (pack_fds) {
4149 		const struct got_error *pack_err =
4150 		    got_repo_pack_fds_close(pack_fds);
4151 		if (error == NULL)
4152 			error = pack_err;
4153 	}
4154 	tog_free_refs();
4155 	return error;
4156 }
4157 
4158 __dead static void
4159 usage_diff(void)
4160 {
4161 	endwin();
4162 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4163 	    "object1 object2\n", getprogname());
4164 	exit(1);
4165 }
4166 
4167 static int
4168 match_line(const char *line, regex_t *regex, size_t nmatch,
4169     regmatch_t *regmatch)
4170 {
4171 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4172 }
4173 
4174 static struct tog_color *
4175 match_color(struct tog_colors *colors, const char *line)
4176 {
4177 	struct tog_color *tc = NULL;
4178 
4179 	STAILQ_FOREACH(tc, colors, entry) {
4180 		if (match_line(line, &tc->regex, 0, NULL))
4181 			return tc;
4182 	}
4183 
4184 	return NULL;
4185 }
4186 
4187 static const struct got_error *
4188 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4189     WINDOW *window, int skipcol, regmatch_t *regmatch)
4190 {
4191 	const struct got_error *err = NULL;
4192 	char *exstr = NULL;
4193 	wchar_t *wline = NULL;
4194 	int rme, rms, n, width, scrollx;
4195 	int width0 = 0, width1 = 0, width2 = 0;
4196 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4197 
4198 	*wtotal = 0;
4199 
4200 	rms = regmatch->rm_so;
4201 	rme = regmatch->rm_eo;
4202 
4203 	err = expand_tab(&exstr, line);
4204 	if (err)
4205 		return err;
4206 
4207 	/* Split the line into 3 segments, according to match offsets. */
4208 	seg0 = strndup(exstr, rms);
4209 	if (seg0 == NULL) {
4210 		err = got_error_from_errno("strndup");
4211 		goto done;
4212 	}
4213 	seg1 = strndup(exstr + rms, rme - rms);
4214 	if (seg1 == NULL) {
4215 		err = got_error_from_errno("strndup");
4216 		goto done;
4217 	}
4218 	seg2 = strdup(exstr + rme);
4219 	if (seg2 == NULL) {
4220 		err = got_error_from_errno("strndup");
4221 		goto done;
4222 	}
4223 
4224 	/* draw up to matched token if we haven't scrolled past it */
4225 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4226 	    col_tab_align, 1);
4227 	if (err)
4228 		goto done;
4229 	n = MAX(width0 - skipcol, 0);
4230 	if (n) {
4231 		free(wline);
4232 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4233 		    wlimit, col_tab_align, 1);
4234 		if (err)
4235 			goto done;
4236 		waddwstr(window, &wline[scrollx]);
4237 		wlimit -= width;
4238 		*wtotal += width;
4239 	}
4240 
4241 	if (wlimit > 0) {
4242 		int i = 0, w = 0;
4243 		size_t wlen;
4244 
4245 		free(wline);
4246 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4247 		    col_tab_align, 1);
4248 		if (err)
4249 			goto done;
4250 		wlen = wcslen(wline);
4251 		while (i < wlen) {
4252 			width = wcwidth(wline[i]);
4253 			if (width == -1) {
4254 				/* should not happen, tabs are expanded */
4255 				err = got_error(GOT_ERR_RANGE);
4256 				goto done;
4257 			}
4258 			if (width0 + w + width > skipcol)
4259 				break;
4260 			w += width;
4261 			i++;
4262 		}
4263 		/* draw (visible part of) matched token (if scrolled into it) */
4264 		if (width1 - w > 0) {
4265 			wattron(window, A_STANDOUT);
4266 			waddwstr(window, &wline[i]);
4267 			wattroff(window, A_STANDOUT);
4268 			wlimit -= (width1 - w);
4269 			*wtotal += (width1 - w);
4270 		}
4271 	}
4272 
4273 	if (wlimit > 0) {  /* draw rest of line */
4274 		free(wline);
4275 		if (skipcol > width0 + width1) {
4276 			err = format_line(&wline, &width2, &scrollx, seg2,
4277 			    skipcol - (width0 + width1), wlimit,
4278 			    col_tab_align, 1);
4279 			if (err)
4280 				goto done;
4281 			waddwstr(window, &wline[scrollx]);
4282 		} else {
4283 			err = format_line(&wline, &width2, NULL, seg2, 0,
4284 			    wlimit, col_tab_align, 1);
4285 			if (err)
4286 				goto done;
4287 			waddwstr(window, wline);
4288 		}
4289 		*wtotal += width2;
4290 	}
4291 done:
4292 	free(wline);
4293 	free(exstr);
4294 	free(seg0);
4295 	free(seg1);
4296 	free(seg2);
4297 	return err;
4298 }
4299 
4300 static int
4301 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4302 {
4303 	FILE	*f = NULL;
4304 	int	*eof, *first, *selected;
4305 
4306 	if (view->type == TOG_VIEW_DIFF) {
4307 		struct tog_diff_view_state *s = &view->state.diff;
4308 
4309 		first = &s->first_displayed_line;
4310 		selected = first;
4311 		eof = &s->eof;
4312 		f = s->f;
4313 	} else if (view->type == TOG_VIEW_HELP) {
4314 		struct tog_help_view_state *s = &view->state.help;
4315 
4316 		first = &s->first_displayed_line;
4317 		selected = first;
4318 		eof = &s->eof;
4319 		f = s->f;
4320 	} else if (view->type == TOG_VIEW_BLAME) {
4321 		struct tog_blame_view_state *s = &view->state.blame;
4322 
4323 		first = &s->first_displayed_line;
4324 		selected = &s->selected_line;
4325 		eof = &s->eof;
4326 		f = s->blame.f;
4327 	} else
4328 		return 0;
4329 
4330 	/* Center gline in the middle of the page like vi(1). */
4331 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4332 		return 0;
4333 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4334 		rewind(f);
4335 		*eof = 0;
4336 		*first = 1;
4337 		*lineno = 0;
4338 		*nprinted = 0;
4339 		return 0;
4340 	}
4341 
4342 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4343 		view->gline : (view->nlines - 3) / 2 + 1;
4344 	view->gline = 0;
4345 
4346 	return 1;
4347 }
4348 
4349 static const struct got_error *
4350 draw_file(struct tog_view *view, const char *header)
4351 {
4352 	struct tog_diff_view_state *s = &view->state.diff;
4353 	regmatch_t *regmatch = &view->regmatch;
4354 	const struct got_error *err;
4355 	int nprinted = 0;
4356 	char *line;
4357 	size_t linesize = 0;
4358 	ssize_t linelen;
4359 	wchar_t *wline;
4360 	int width;
4361 	int max_lines = view->nlines;
4362 	int nlines = s->nlines;
4363 	off_t line_offset;
4364 
4365 	s->lineno = s->first_displayed_line - 1;
4366 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4367 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4368 		return got_error_from_errno("fseek");
4369 
4370 	werase(view->window);
4371 
4372 	if (view->gline > s->nlines - 1)
4373 		view->gline = s->nlines - 1;
4374 
4375 	if (header) {
4376 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4377 		    1 : view->gline - (view->nlines - 3) / 2 :
4378 		    s->lineno + s->selected_line;
4379 
4380 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4381 			return got_error_from_errno("asprintf");
4382 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4383 		    0, 0);
4384 		free(line);
4385 		if (err)
4386 			return err;
4387 
4388 		if (view_needs_focus_indication(view))
4389 			wstandout(view->window);
4390 		waddwstr(view->window, wline);
4391 		free(wline);
4392 		wline = NULL;
4393 		while (width++ < view->ncols)
4394 			waddch(view->window, ' ');
4395 		if (view_needs_focus_indication(view))
4396 			wstandend(view->window);
4397 
4398 		if (max_lines <= 1)
4399 			return NULL;
4400 		max_lines--;
4401 	}
4402 
4403 	s->eof = 0;
4404 	view->maxx = 0;
4405 	line = NULL;
4406 	while (max_lines > 0 && nprinted < max_lines) {
4407 		enum got_diff_line_type linetype;
4408 		attr_t attr = 0;
4409 
4410 		linelen = getline(&line, &linesize, s->f);
4411 		if (linelen == -1) {
4412 			if (feof(s->f)) {
4413 				s->eof = 1;
4414 				break;
4415 			}
4416 			free(line);
4417 			return got_ferror(s->f, GOT_ERR_IO);
4418 		}
4419 
4420 		if (++s->lineno < s->first_displayed_line)
4421 			continue;
4422 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4423 			continue;
4424 		if (s->lineno == view->hiline)
4425 			attr = A_STANDOUT;
4426 
4427 		/* Set view->maxx based on full line length. */
4428 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4429 		    view->x ? 1 : 0);
4430 		if (err) {
4431 			free(line);
4432 			return err;
4433 		}
4434 		view->maxx = MAX(view->maxx, width);
4435 		free(wline);
4436 		wline = NULL;
4437 
4438 		linetype = s->lines[s->lineno].type;
4439 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4440 		    linetype < GOT_DIFF_LINE_CONTEXT)
4441 			attr |= COLOR_PAIR(linetype);
4442 		if (attr)
4443 			wattron(view->window, attr);
4444 		if (s->first_displayed_line + nprinted == s->matched_line &&
4445 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4446 			err = add_matched_line(&width, line, view->ncols, 0,
4447 			    view->window, view->x, regmatch);
4448 			if (err) {
4449 				free(line);
4450 				return err;
4451 			}
4452 		} else {
4453 			int skip;
4454 			err = format_line(&wline, &width, &skip, line,
4455 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4456 			if (err) {
4457 				free(line);
4458 				return err;
4459 			}
4460 			waddwstr(view->window, &wline[skip]);
4461 			free(wline);
4462 			wline = NULL;
4463 		}
4464 		if (s->lineno == view->hiline) {
4465 			/* highlight full gline length */
4466 			while (width++ < view->ncols)
4467 				waddch(view->window, ' ');
4468 		} else {
4469 			if (width <= view->ncols - 1)
4470 				waddch(view->window, '\n');
4471 		}
4472 		if (attr)
4473 			wattroff(view->window, attr);
4474 		if (++nprinted == 1)
4475 			s->first_displayed_line = s->lineno;
4476 	}
4477 	free(line);
4478 	if (nprinted >= 1)
4479 		s->last_displayed_line = s->first_displayed_line +
4480 		    (nprinted - 1);
4481 	else
4482 		s->last_displayed_line = s->first_displayed_line;
4483 
4484 	view_border(view);
4485 
4486 	if (s->eof) {
4487 		while (nprinted < view->nlines) {
4488 			waddch(view->window, '\n');
4489 			nprinted++;
4490 		}
4491 
4492 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4493 		    view->ncols, 0, 0);
4494 		if (err) {
4495 			return err;
4496 		}
4497 
4498 		wstandout(view->window);
4499 		waddwstr(view->window, wline);
4500 		free(wline);
4501 		wline = NULL;
4502 		wstandend(view->window);
4503 	}
4504 
4505 	return NULL;
4506 }
4507 
4508 static char *
4509 get_datestr(time_t *time, char *datebuf)
4510 {
4511 	struct tm mytm, *tm;
4512 	char *p, *s;
4513 
4514 	tm = gmtime_r(time, &mytm);
4515 	if (tm == NULL)
4516 		return NULL;
4517 	s = asctime_r(tm, datebuf);
4518 	if (s == NULL)
4519 		return NULL;
4520 	p = strchr(s, '\n');
4521 	if (p)
4522 		*p = '\0';
4523 	return s;
4524 }
4525 
4526 static const struct got_error *
4527 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4528     off_t off, uint8_t type)
4529 {
4530 	struct got_diff_line *p;
4531 
4532 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4533 	if (p == NULL)
4534 		return got_error_from_errno("reallocarray");
4535 	*lines = p;
4536 	(*lines)[*nlines].offset = off;
4537 	(*lines)[*nlines].type = type;
4538 	(*nlines)++;
4539 
4540 	return NULL;
4541 }
4542 
4543 static const struct got_error *
4544 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4545     struct got_diff_line *s_lines, size_t s_nlines)
4546 {
4547 	struct got_diff_line	*p;
4548 	char			 buf[BUFSIZ];
4549 	size_t			 i, r;
4550 
4551 	if (fseeko(src, 0L, SEEK_SET) == -1)
4552 		return got_error_from_errno("fseeko");
4553 
4554 	for (;;) {
4555 		r = fread(buf, 1, sizeof(buf), src);
4556 		if (r == 0) {
4557 			if (ferror(src))
4558 				return got_error_from_errno("fread");
4559 			if (feof(src))
4560 				break;
4561 		}
4562 		if (fwrite(buf, 1, r, dst) != r)
4563 			return got_ferror(dst, GOT_ERR_IO);
4564 	}
4565 
4566 	/*
4567 	 * The diff driver initialises the first line at offset zero when the
4568 	 * array isn't prepopulated, skip it; we already have it in *d_lines.
4569 	 */
4570 	for (i = 1; i < s_nlines; ++i)
4571 		s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4572 
4573 	--s_nlines;
4574 
4575 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4576 	if (p == NULL) {
4577 		/* d_lines is freed in close_diff_view() */
4578 		return got_error_from_errno("reallocarray");
4579 	}
4580 
4581 	*d_lines = p;
4582 
4583 	memcpy(*d_lines + *d_nlines, s_lines + 1, s_nlines * sizeof(*s_lines));
4584 	*d_nlines += s_nlines;
4585 
4586 	return NULL;
4587 }
4588 
4589 static const struct got_error *
4590 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4591     struct got_object_id *commit_id, struct got_reflist_head *refs,
4592     struct got_repository *repo, int ignore_ws, int force_text_diff,
4593     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4594 {
4595 	const struct got_error *err = NULL;
4596 	char datebuf[26], *datestr;
4597 	struct got_commit_object *commit;
4598 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4599 	time_t committer_time;
4600 	const char *author, *committer;
4601 	char *refs_str = NULL;
4602 	struct got_pathlist_entry *pe;
4603 	off_t outoff = 0;
4604 	int n;
4605 
4606 	if (refs) {
4607 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4608 		if (err)
4609 			return err;
4610 	}
4611 
4612 	err = got_object_open_as_commit(&commit, repo, commit_id);
4613 	if (err)
4614 		return err;
4615 
4616 	err = got_object_id_str(&id_str, commit_id);
4617 	if (err) {
4618 		err = got_error_from_errno("got_object_id_str");
4619 		goto done;
4620 	}
4621 
4622 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4623 	if (err)
4624 		goto done;
4625 
4626 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4627 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4628 	if (n < 0) {
4629 		err = got_error_from_errno("fprintf");
4630 		goto done;
4631 	}
4632 	outoff += n;
4633 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4634 	if (err)
4635 		goto done;
4636 
4637 	n = fprintf(outfile, "from: %s\n",
4638 	    got_object_commit_get_author(commit));
4639 	if (n < 0) {
4640 		err = got_error_from_errno("fprintf");
4641 		goto done;
4642 	}
4643 	outoff += n;
4644 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4645 	if (err)
4646 		goto done;
4647 
4648 	author = got_object_commit_get_author(commit);
4649 	committer = got_object_commit_get_committer(commit);
4650 	if (strcmp(author, committer) != 0) {
4651 		n = fprintf(outfile, "via: %s\n", committer);
4652 		if (n < 0) {
4653 			err = got_error_from_errno("fprintf");
4654 			goto done;
4655 		}
4656 		outoff += n;
4657 		err = add_line_metadata(lines, nlines, outoff,
4658 		    GOT_DIFF_LINE_AUTHOR);
4659 		if (err)
4660 			goto done;
4661 	}
4662 	committer_time = got_object_commit_get_committer_time(commit);
4663 	datestr = get_datestr(&committer_time, datebuf);
4664 	if (datestr) {
4665 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4666 		if (n < 0) {
4667 			err = got_error_from_errno("fprintf");
4668 			goto done;
4669 		}
4670 		outoff += n;
4671 		err = add_line_metadata(lines, nlines, outoff,
4672 		    GOT_DIFF_LINE_DATE);
4673 		if (err)
4674 			goto done;
4675 	}
4676 	if (got_object_commit_get_nparents(commit) > 1) {
4677 		const struct got_object_id_queue *parent_ids;
4678 		struct got_object_qid *qid;
4679 		int pn = 1;
4680 		parent_ids = got_object_commit_get_parent_ids(commit);
4681 		STAILQ_FOREACH(qid, parent_ids, entry) {
4682 			err = got_object_id_str(&id_str, &qid->id);
4683 			if (err)
4684 				goto done;
4685 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4686 			if (n < 0) {
4687 				err = got_error_from_errno("fprintf");
4688 				goto done;
4689 			}
4690 			outoff += n;
4691 			err = add_line_metadata(lines, nlines, outoff,
4692 			    GOT_DIFF_LINE_META);
4693 			if (err)
4694 				goto done;
4695 			free(id_str);
4696 			id_str = NULL;
4697 		}
4698 	}
4699 
4700 	err = got_object_commit_get_logmsg(&logmsg, commit);
4701 	if (err)
4702 		goto done;
4703 	s = logmsg;
4704 	while ((line = strsep(&s, "\n")) != NULL) {
4705 		n = fprintf(outfile, "%s\n", line);
4706 		if (n < 0) {
4707 			err = got_error_from_errno("fprintf");
4708 			goto done;
4709 		}
4710 		outoff += n;
4711 		err = add_line_metadata(lines, nlines, outoff,
4712 		    GOT_DIFF_LINE_LOGMSG);
4713 		if (err)
4714 			goto done;
4715 	}
4716 
4717 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4718 		struct got_diff_changed_path *cp = pe->data;
4719 		int pad = dsa->max_path_len - pe->path_len + 1;
4720 
4721 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4722 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4723 		    dsa->rm_cols + 1, cp->rm);
4724 		if (n < 0) {
4725 			err = got_error_from_errno("fprintf");
4726 			goto done;
4727 		}
4728 		outoff += n;
4729 		err = add_line_metadata(lines, nlines, outoff,
4730 		    GOT_DIFF_LINE_CHANGES);
4731 		if (err)
4732 			goto done;
4733 	}
4734 
4735 	fputc('\n', outfile);
4736 	outoff++;
4737 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4738 	if (err)
4739 		goto done;
4740 
4741 	n = fprintf(outfile,
4742 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4743 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4744 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4745 	if (n < 0) {
4746 		err = got_error_from_errno("fprintf");
4747 		goto done;
4748 	}
4749 	outoff += n;
4750 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4751 	if (err)
4752 		goto done;
4753 
4754 	fputc('\n', outfile);
4755 	outoff++;
4756 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4757 done:
4758 	free(id_str);
4759 	free(logmsg);
4760 	free(refs_str);
4761 	got_object_commit_close(commit);
4762 	if (err) {
4763 		free(*lines);
4764 		*lines = NULL;
4765 		*nlines = 0;
4766 	}
4767 	return err;
4768 }
4769 
4770 static const struct got_error *
4771 create_diff(struct tog_diff_view_state *s)
4772 {
4773 	const struct got_error *err = NULL;
4774 	FILE *f = NULL, *tmp_diff_file = NULL;
4775 	int obj_type;
4776 	struct got_diff_line *lines = NULL;
4777 	struct got_pathlist_head changed_paths;
4778 
4779 	TAILQ_INIT(&changed_paths);
4780 
4781 	free(s->lines);
4782 	s->lines = malloc(sizeof(*s->lines));
4783 	if (s->lines == NULL)
4784 		return got_error_from_errno("malloc");
4785 	s->nlines = 0;
4786 
4787 	f = got_opentemp();
4788 	if (f == NULL) {
4789 		err = got_error_from_errno("got_opentemp");
4790 		goto done;
4791 	}
4792 	tmp_diff_file = got_opentemp();
4793 	if (tmp_diff_file == NULL) {
4794 		err = got_error_from_errno("got_opentemp");
4795 		goto done;
4796 	}
4797 	if (s->f && fclose(s->f) == EOF) {
4798 		err = got_error_from_errno("fclose");
4799 		goto done;
4800 	}
4801 	s->f = f;
4802 
4803 	if (s->id1)
4804 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4805 	else
4806 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4807 	if (err)
4808 		goto done;
4809 
4810 	switch (obj_type) {
4811 	case GOT_OBJ_TYPE_BLOB:
4812 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4813 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4814 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4815 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4816 		    s->f);
4817 		break;
4818 	case GOT_OBJ_TYPE_TREE:
4819 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4820 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4821 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4822 		    s->force_text_diff, NULL, s->repo, s->f);
4823 		break;
4824 	case GOT_OBJ_TYPE_COMMIT: {
4825 		const struct got_object_id_queue *parent_ids;
4826 		struct got_object_qid *pid;
4827 		struct got_commit_object *commit2;
4828 		struct got_reflist_head *refs;
4829 		size_t nlines = 0;
4830 		struct got_diffstat_cb_arg dsa = {
4831 			0, 0, 0, 0, 0, 0,
4832 			&changed_paths,
4833 			s->ignore_whitespace,
4834 			s->force_text_diff,
4835 			tog_diff_algo
4836 		};
4837 
4838 		lines = malloc(sizeof(*lines));
4839 		if (lines == NULL) {
4840 			err = got_error_from_errno("malloc");
4841 			goto done;
4842 		}
4843 
4844 		/* build diff first in tmp file then append to commit info */
4845 		err = got_diff_objects_as_commits(&lines, &nlines,
4846 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4847 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4848 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4849 		if (err)
4850 			break;
4851 
4852 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4853 		if (err)
4854 			goto done;
4855 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4856 		/* Show commit info if we're diffing to a parent/root commit. */
4857 		if (s->id1 == NULL) {
4858 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4859 			    refs, s->repo, s->ignore_whitespace,
4860 			    s->force_text_diff, &dsa, s->f);
4861 			if (err)
4862 				goto done;
4863 		} else {
4864 			parent_ids = got_object_commit_get_parent_ids(commit2);
4865 			STAILQ_FOREACH(pid, parent_ids, entry) {
4866 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4867 					err = write_commit_info(&s->lines,
4868 					    &s->nlines, s->id2, refs, s->repo,
4869 					    s->ignore_whitespace,
4870 					    s->force_text_diff, &dsa, s->f);
4871 					if (err)
4872 						goto done;
4873 					break;
4874 				}
4875 			}
4876 		}
4877 		got_object_commit_close(commit2);
4878 
4879 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4880 		    lines, nlines);
4881 		break;
4882 	}
4883 	default:
4884 		err = got_error(GOT_ERR_OBJ_TYPE);
4885 		break;
4886 	}
4887 done:
4888 	free(lines);
4889 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4890 	if (s->f && fflush(s->f) != 0 && err == NULL)
4891 		err = got_error_from_errno("fflush");
4892 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4893 		err = got_error_from_errno("fclose");
4894 	return err;
4895 }
4896 
4897 static void
4898 diff_view_indicate_progress(struct tog_view *view)
4899 {
4900 	mvwaddstr(view->window, 0, 0, "diffing...");
4901 	update_panels();
4902 	doupdate();
4903 }
4904 
4905 static const struct got_error *
4906 search_start_diff_view(struct tog_view *view)
4907 {
4908 	struct tog_diff_view_state *s = &view->state.diff;
4909 
4910 	s->matched_line = 0;
4911 	return NULL;
4912 }
4913 
4914 static void
4915 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4916     size_t *nlines, int **first, int **last, int **match, int **selected)
4917 {
4918 	struct tog_diff_view_state *s = &view->state.diff;
4919 
4920 	*f = s->f;
4921 	*nlines = s->nlines;
4922 	*line_offsets = NULL;
4923 	*match = &s->matched_line;
4924 	*first = &s->first_displayed_line;
4925 	*last = &s->last_displayed_line;
4926 	*selected = &s->selected_line;
4927 }
4928 
4929 static const struct got_error *
4930 search_next_view_match(struct tog_view *view)
4931 {
4932 	const struct got_error *err = NULL;
4933 	FILE *f;
4934 	int lineno;
4935 	char *line = NULL;
4936 	size_t linesize = 0;
4937 	ssize_t linelen;
4938 	off_t *line_offsets;
4939 	size_t nlines = 0;
4940 	int *first, *last, *match, *selected;
4941 
4942 	if (!view->search_setup)
4943 		return got_error_msg(GOT_ERR_NOT_IMPL,
4944 		    "view search not supported");
4945 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4946 	    &match, &selected);
4947 
4948 	if (!view->searching) {
4949 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4950 		return NULL;
4951 	}
4952 
4953 	if (*match) {
4954 		if (view->searching == TOG_SEARCH_FORWARD)
4955 			lineno = *match + 1;
4956 		else
4957 			lineno = *match - 1;
4958 	} else
4959 		lineno = *first - 1 + *selected;
4960 
4961 	while (1) {
4962 		off_t offset;
4963 
4964 		if (lineno <= 0 || lineno > nlines) {
4965 			if (*match == 0) {
4966 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4967 				break;
4968 			}
4969 
4970 			if (view->searching == TOG_SEARCH_FORWARD)
4971 				lineno = 1;
4972 			else
4973 				lineno = nlines;
4974 		}
4975 
4976 		offset = view->type == TOG_VIEW_DIFF ?
4977 		    view->state.diff.lines[lineno - 1].offset :
4978 		    line_offsets[lineno - 1];
4979 		if (fseeko(f, offset, SEEK_SET) != 0) {
4980 			free(line);
4981 			return got_error_from_errno("fseeko");
4982 		}
4983 		linelen = getline(&line, &linesize, f);
4984 		if (linelen != -1) {
4985 			char *exstr;
4986 			err = expand_tab(&exstr, line);
4987 			if (err)
4988 				break;
4989 			if (match_line(exstr, &view->regex, 1,
4990 			    &view->regmatch)) {
4991 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4992 				*match = lineno;
4993 				free(exstr);
4994 				break;
4995 			}
4996 			free(exstr);
4997 		}
4998 		if (view->searching == TOG_SEARCH_FORWARD)
4999 			lineno++;
5000 		else
5001 			lineno--;
5002 	}
5003 	free(line);
5004 
5005 	if (*match) {
5006 		*first = *match;
5007 		*selected = 1;
5008 	}
5009 
5010 	return err;
5011 }
5012 
5013 static const struct got_error *
5014 close_diff_view(struct tog_view *view)
5015 {
5016 	const struct got_error *err = NULL;
5017 	struct tog_diff_view_state *s = &view->state.diff;
5018 
5019 	free(s->id1);
5020 	s->id1 = NULL;
5021 	free(s->id2);
5022 	s->id2 = NULL;
5023 	if (s->f && fclose(s->f) == EOF)
5024 		err = got_error_from_errno("fclose");
5025 	s->f = NULL;
5026 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5027 		err = got_error_from_errno("fclose");
5028 	s->f1 = NULL;
5029 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5030 		err = got_error_from_errno("fclose");
5031 	s->f2 = NULL;
5032 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5033 		err = got_error_from_errno("close");
5034 	s->fd1 = -1;
5035 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5036 		err = got_error_from_errno("close");
5037 	s->fd2 = -1;
5038 	free(s->lines);
5039 	s->lines = NULL;
5040 	s->nlines = 0;
5041 	return err;
5042 }
5043 
5044 static const struct got_error *
5045 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5046     struct got_object_id *id2, const char *label1, const char *label2,
5047     int diff_context, int ignore_whitespace, int force_text_diff,
5048     struct tog_view *parent_view, struct got_repository *repo)
5049 {
5050 	const struct got_error *err;
5051 	struct tog_diff_view_state *s = &view->state.diff;
5052 
5053 	memset(s, 0, sizeof(*s));
5054 	s->fd1 = -1;
5055 	s->fd2 = -1;
5056 
5057 	if (id1 != NULL && id2 != NULL) {
5058 	    int type1, type2;
5059 	    err = got_object_get_type(&type1, repo, id1);
5060 	    if (err)
5061 		return err;
5062 	    err = got_object_get_type(&type2, repo, id2);
5063 	    if (err)
5064 		return err;
5065 
5066 	    if (type1 != type2)
5067 		return got_error(GOT_ERR_OBJ_TYPE);
5068 	}
5069 	s->first_displayed_line = 1;
5070 	s->last_displayed_line = view->nlines;
5071 	s->selected_line = 1;
5072 	s->repo = repo;
5073 	s->id1 = id1;
5074 	s->id2 = id2;
5075 	s->label1 = label1;
5076 	s->label2 = label2;
5077 
5078 	if (id1) {
5079 		s->id1 = got_object_id_dup(id1);
5080 		if (s->id1 == NULL)
5081 			return got_error_from_errno("got_object_id_dup");
5082 	} else
5083 		s->id1 = NULL;
5084 
5085 	s->id2 = got_object_id_dup(id2);
5086 	if (s->id2 == NULL) {
5087 		err = got_error_from_errno("got_object_id_dup");
5088 		goto done;
5089 	}
5090 
5091 	s->f1 = got_opentemp();
5092 	if (s->f1 == NULL) {
5093 		err = got_error_from_errno("got_opentemp");
5094 		goto done;
5095 	}
5096 
5097 	s->f2 = got_opentemp();
5098 	if (s->f2 == NULL) {
5099 		err = got_error_from_errno("got_opentemp");
5100 		goto done;
5101 	}
5102 
5103 	s->fd1 = got_opentempfd();
5104 	if (s->fd1 == -1) {
5105 		err = got_error_from_errno("got_opentempfd");
5106 		goto done;
5107 	}
5108 
5109 	s->fd2 = got_opentempfd();
5110 	if (s->fd2 == -1) {
5111 		err = got_error_from_errno("got_opentempfd");
5112 		goto done;
5113 	}
5114 
5115 	s->diff_context = diff_context;
5116 	s->ignore_whitespace = ignore_whitespace;
5117 	s->force_text_diff = force_text_diff;
5118 	s->parent_view = parent_view;
5119 	s->repo = repo;
5120 
5121 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5122 		int rc;
5123 
5124 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5125 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5126 		if (rc != ERR)
5127 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5128 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5129 		if (rc != ERR)
5130 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5131 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5132 		if (rc != ERR)
5133 			rc = init_pair(GOT_DIFF_LINE_META,
5134 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5135 		if (rc != ERR)
5136 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5137 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5138 		if (rc != ERR)
5139 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5140 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5141 		if (rc != ERR)
5142 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5143 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5144 		if (rc != ERR)
5145 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5146 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5147 		if (rc != ERR)
5148 			rc = init_pair(GOT_DIFF_LINE_DATE,
5149 			    get_color_value("TOG_COLOR_DATE"), -1);
5150 		if (rc == ERR) {
5151 			err = got_error(GOT_ERR_RANGE);
5152 			goto done;
5153 		}
5154 	}
5155 
5156 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5157 	    view_is_splitscreen(view))
5158 		show_log_view(parent_view); /* draw border */
5159 	diff_view_indicate_progress(view);
5160 
5161 	err = create_diff(s);
5162 
5163 	view->show = show_diff_view;
5164 	view->input = input_diff_view;
5165 	view->reset = reset_diff_view;
5166 	view->close = close_diff_view;
5167 	view->search_start = search_start_diff_view;
5168 	view->search_setup = search_setup_diff_view;
5169 	view->search_next = search_next_view_match;
5170 done:
5171 	if (err)
5172 		close_diff_view(view);
5173 	return err;
5174 }
5175 
5176 static const struct got_error *
5177 show_diff_view(struct tog_view *view)
5178 {
5179 	const struct got_error *err;
5180 	struct tog_diff_view_state *s = &view->state.diff;
5181 	char *id_str1 = NULL, *id_str2, *header;
5182 	const char *label1, *label2;
5183 
5184 	if (s->id1) {
5185 		err = got_object_id_str(&id_str1, s->id1);
5186 		if (err)
5187 			return err;
5188 		label1 = s->label1 ? s->label1 : id_str1;
5189 	} else
5190 		label1 = "/dev/null";
5191 
5192 	err = got_object_id_str(&id_str2, s->id2);
5193 	if (err)
5194 		return err;
5195 	label2 = s->label2 ? s->label2 : id_str2;
5196 
5197 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5198 		err = got_error_from_errno("asprintf");
5199 		free(id_str1);
5200 		free(id_str2);
5201 		return err;
5202 	}
5203 	free(id_str1);
5204 	free(id_str2);
5205 
5206 	err = draw_file(view, header);
5207 	free(header);
5208 	return err;
5209 }
5210 
5211 static const struct got_error *
5212 set_selected_commit(struct tog_diff_view_state *s,
5213     struct commit_queue_entry *entry)
5214 {
5215 	const struct got_error *err;
5216 	const struct got_object_id_queue *parent_ids;
5217 	struct got_commit_object *selected_commit;
5218 	struct got_object_qid *pid;
5219 
5220 	free(s->id2);
5221 	s->id2 = got_object_id_dup(entry->id);
5222 	if (s->id2 == NULL)
5223 		return got_error_from_errno("got_object_id_dup");
5224 
5225 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5226 	if (err)
5227 		return err;
5228 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5229 	free(s->id1);
5230 	pid = STAILQ_FIRST(parent_ids);
5231 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5232 	got_object_commit_close(selected_commit);
5233 	return NULL;
5234 }
5235 
5236 static const struct got_error *
5237 reset_diff_view(struct tog_view *view)
5238 {
5239 	struct tog_diff_view_state *s = &view->state.diff;
5240 
5241 	view->count = 0;
5242 	wclear(view->window);
5243 	s->first_displayed_line = 1;
5244 	s->last_displayed_line = view->nlines;
5245 	s->matched_line = 0;
5246 	diff_view_indicate_progress(view);
5247 	return create_diff(s);
5248 }
5249 
5250 static void
5251 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5252 {
5253 	int start, i;
5254 
5255 	i = start = s->first_displayed_line - 1;
5256 
5257 	while (s->lines[i].type != type) {
5258 		if (i == 0)
5259 			i = s->nlines - 1;
5260 		if (--i == start)
5261 			return; /* do nothing, requested type not in file */
5262 	}
5263 
5264 	s->selected_line = 1;
5265 	s->first_displayed_line = i;
5266 }
5267 
5268 static void
5269 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5270 {
5271 	int start, i;
5272 
5273 	i = start = s->first_displayed_line + 1;
5274 
5275 	while (s->lines[i].type != type) {
5276 		if (i == s->nlines - 1)
5277 			i = 0;
5278 		if (++i == start)
5279 			return; /* do nothing, requested type not in file */
5280 	}
5281 
5282 	s->selected_line = 1;
5283 	s->first_displayed_line = i;
5284 }
5285 
5286 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5287     int, int, int);
5288 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5289     int, int);
5290 
5291 static const struct got_error *
5292 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5293 {
5294 	const struct got_error *err = NULL;
5295 	struct tog_diff_view_state *s = &view->state.diff;
5296 	struct tog_log_view_state *ls;
5297 	struct commit_queue_entry *old_selected_entry;
5298 	char *line = NULL;
5299 	size_t linesize = 0;
5300 	ssize_t linelen;
5301 	int i, nscroll = view->nlines - 1, up = 0;
5302 
5303 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5304 
5305 	switch (ch) {
5306 	case '0':
5307 		view->x = 0;
5308 		break;
5309 	case '$':
5310 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5311 		view->count = 0;
5312 		break;
5313 	case KEY_RIGHT:
5314 	case 'l':
5315 		if (view->x + view->ncols / 3 < view->maxx)
5316 			view->x += 2;  /* move two columns right */
5317 		else
5318 			view->count = 0;
5319 		break;
5320 	case KEY_LEFT:
5321 	case 'h':
5322 		view->x -= MIN(view->x, 2);  /* move two columns back */
5323 		if (view->x <= 0)
5324 			view->count = 0;
5325 		break;
5326 	case 'a':
5327 	case 'w':
5328 		if (ch == 'a') {
5329 			s->force_text_diff = !s->force_text_diff;
5330 			view->action = s->force_text_diff ?
5331 			    "force ASCII text enabled" :
5332 			    "force ASCII text disabled";
5333 		}
5334 		else if (ch == 'w') {
5335 			s->ignore_whitespace = !s->ignore_whitespace;
5336 			view->action = s->ignore_whitespace ?
5337 			    "ignore whitespace enabled" :
5338 			    "ignore whitespace disabled";
5339 		}
5340 		err = reset_diff_view(view);
5341 		break;
5342 	case 'g':
5343 	case KEY_HOME:
5344 		s->first_displayed_line = 1;
5345 		view->count = 0;
5346 		break;
5347 	case 'G':
5348 	case KEY_END:
5349 		view->count = 0;
5350 		if (s->eof)
5351 			break;
5352 
5353 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5354 		s->eof = 1;
5355 		break;
5356 	case 'k':
5357 	case KEY_UP:
5358 	case CTRL('p'):
5359 		if (s->first_displayed_line > 1)
5360 			s->first_displayed_line--;
5361 		else
5362 			view->count = 0;
5363 		break;
5364 	case CTRL('u'):
5365 	case 'u':
5366 		nscroll /= 2;
5367 		/* FALL THROUGH */
5368 	case KEY_PPAGE:
5369 	case CTRL('b'):
5370 	case 'b':
5371 		if (s->first_displayed_line == 1) {
5372 			view->count = 0;
5373 			break;
5374 		}
5375 		i = 0;
5376 		while (i++ < nscroll && s->first_displayed_line > 1)
5377 			s->first_displayed_line--;
5378 		break;
5379 	case 'j':
5380 	case KEY_DOWN:
5381 	case CTRL('n'):
5382 		if (!s->eof)
5383 			s->first_displayed_line++;
5384 		else
5385 			view->count = 0;
5386 		break;
5387 	case CTRL('d'):
5388 	case 'd':
5389 		nscroll /= 2;
5390 		/* FALL THROUGH */
5391 	case KEY_NPAGE:
5392 	case CTRL('f'):
5393 	case 'f':
5394 	case ' ':
5395 		if (s->eof) {
5396 			view->count = 0;
5397 			break;
5398 		}
5399 		i = 0;
5400 		while (!s->eof && i++ < nscroll) {
5401 			linelen = getline(&line, &linesize, s->f);
5402 			s->first_displayed_line++;
5403 			if (linelen == -1) {
5404 				if (feof(s->f)) {
5405 					s->eof = 1;
5406 				} else
5407 					err = got_ferror(s->f, GOT_ERR_IO);
5408 				break;
5409 			}
5410 		}
5411 		free(line);
5412 		break;
5413 	case '(':
5414 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5415 		break;
5416 	case ')':
5417 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5418 		break;
5419 	case '{':
5420 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5421 		break;
5422 	case '}':
5423 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5424 		break;
5425 	case '[':
5426 		if (s->diff_context > 0) {
5427 			s->diff_context--;
5428 			s->matched_line = 0;
5429 			diff_view_indicate_progress(view);
5430 			err = create_diff(s);
5431 			if (s->first_displayed_line + view->nlines - 1 >
5432 			    s->nlines) {
5433 				s->first_displayed_line = 1;
5434 				s->last_displayed_line = view->nlines;
5435 			}
5436 		} else
5437 			view->count = 0;
5438 		break;
5439 	case ']':
5440 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5441 			s->diff_context++;
5442 			s->matched_line = 0;
5443 			diff_view_indicate_progress(view);
5444 			err = create_diff(s);
5445 		} else
5446 			view->count = 0;
5447 		break;
5448 	case '<':
5449 	case ',':
5450 	case 'K':
5451 		up = 1;
5452 		/* FALL THROUGH */
5453 	case '>':
5454 	case '.':
5455 	case 'J':
5456 		if (s->parent_view == NULL) {
5457 			view->count = 0;
5458 			break;
5459 		}
5460 		s->parent_view->count = view->count;
5461 
5462 		if (s->parent_view->type == TOG_VIEW_LOG) {
5463 			ls = &s->parent_view->state.log;
5464 			old_selected_entry = ls->selected_entry;
5465 
5466 			err = input_log_view(NULL, s->parent_view,
5467 			    up ? KEY_UP : KEY_DOWN);
5468 			if (err)
5469 				break;
5470 			view->count = s->parent_view->count;
5471 
5472 			if (old_selected_entry == ls->selected_entry)
5473 				break;
5474 
5475 			err = set_selected_commit(s, ls->selected_entry);
5476 			if (err)
5477 				break;
5478 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5479 			struct tog_blame_view_state *bs;
5480 			struct got_object_id *id, *prev_id;
5481 
5482 			bs = &s->parent_view->state.blame;
5483 			prev_id = get_annotation_for_line(bs->blame.lines,
5484 			    bs->blame.nlines, bs->last_diffed_line);
5485 
5486 			err = input_blame_view(&view, s->parent_view,
5487 			    up ? KEY_UP : KEY_DOWN);
5488 			if (err)
5489 				break;
5490 			view->count = s->parent_view->count;
5491 
5492 			if (prev_id == NULL)
5493 				break;
5494 			id = get_selected_commit_id(bs->blame.lines,
5495 			    bs->blame.nlines, bs->first_displayed_line,
5496 			    bs->selected_line);
5497 			if (id == NULL)
5498 				break;
5499 
5500 			if (!got_object_id_cmp(prev_id, id))
5501 				break;
5502 
5503 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5504 			if (err)
5505 				break;
5506 		}
5507 		s->first_displayed_line = 1;
5508 		s->last_displayed_line = view->nlines;
5509 		s->matched_line = 0;
5510 		view->x = 0;
5511 
5512 		diff_view_indicate_progress(view);
5513 		err = create_diff(s);
5514 		break;
5515 	default:
5516 		view->count = 0;
5517 		break;
5518 	}
5519 
5520 	return err;
5521 }
5522 
5523 static const struct got_error *
5524 cmd_diff(int argc, char *argv[])
5525 {
5526 	const struct got_error *error = NULL;
5527 	struct got_repository *repo = NULL;
5528 	struct got_worktree *worktree = NULL;
5529 	struct got_object_id *id1 = NULL, *id2 = NULL;
5530 	char *repo_path = NULL, *cwd = NULL;
5531 	char *id_str1 = NULL, *id_str2 = NULL;
5532 	char *label1 = NULL, *label2 = NULL;
5533 	int diff_context = 3, ignore_whitespace = 0;
5534 	int ch, force_text_diff = 0;
5535 	const char *errstr;
5536 	struct tog_view *view;
5537 	int *pack_fds = NULL;
5538 
5539 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5540 		switch (ch) {
5541 		case 'a':
5542 			force_text_diff = 1;
5543 			break;
5544 		case 'C':
5545 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5546 			    &errstr);
5547 			if (errstr != NULL)
5548 				errx(1, "number of context lines is %s: %s",
5549 				    errstr, errstr);
5550 			break;
5551 		case 'r':
5552 			repo_path = realpath(optarg, NULL);
5553 			if (repo_path == NULL)
5554 				return got_error_from_errno2("realpath",
5555 				    optarg);
5556 			got_path_strip_trailing_slashes(repo_path);
5557 			break;
5558 		case 'w':
5559 			ignore_whitespace = 1;
5560 			break;
5561 		default:
5562 			usage_diff();
5563 			/* NOTREACHED */
5564 		}
5565 	}
5566 
5567 	argc -= optind;
5568 	argv += optind;
5569 
5570 	if (argc == 0) {
5571 		usage_diff(); /* TODO show local worktree changes */
5572 	} else if (argc == 2) {
5573 		id_str1 = argv[0];
5574 		id_str2 = argv[1];
5575 	} else
5576 		usage_diff();
5577 
5578 	error = got_repo_pack_fds_open(&pack_fds);
5579 	if (error)
5580 		goto done;
5581 
5582 	if (repo_path == NULL) {
5583 		cwd = getcwd(NULL, 0);
5584 		if (cwd == NULL)
5585 			return got_error_from_errno("getcwd");
5586 		error = got_worktree_open(&worktree, cwd);
5587 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5588 			goto done;
5589 		if (worktree)
5590 			repo_path =
5591 			    strdup(got_worktree_get_repo_path(worktree));
5592 		else
5593 			repo_path = strdup(cwd);
5594 		if (repo_path == NULL) {
5595 			error = got_error_from_errno("strdup");
5596 			goto done;
5597 		}
5598 	}
5599 
5600 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5601 	if (error)
5602 		goto done;
5603 
5604 	init_curses();
5605 
5606 	error = apply_unveil(got_repo_get_path(repo), NULL);
5607 	if (error)
5608 		goto done;
5609 
5610 	error = tog_load_refs(repo, 0);
5611 	if (error)
5612 		goto done;
5613 
5614 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5615 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5616 	if (error)
5617 		goto done;
5618 
5619 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5620 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5621 	if (error)
5622 		goto done;
5623 
5624 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5625 	if (view == NULL) {
5626 		error = got_error_from_errno("view_open");
5627 		goto done;
5628 	}
5629 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5630 	    ignore_whitespace, force_text_diff, NULL,  repo);
5631 	if (error)
5632 		goto done;
5633 	error = view_loop(view);
5634 done:
5635 	free(label1);
5636 	free(label2);
5637 	free(repo_path);
5638 	free(cwd);
5639 	if (repo) {
5640 		const struct got_error *close_err = got_repo_close(repo);
5641 		if (error == NULL)
5642 			error = close_err;
5643 	}
5644 	if (worktree)
5645 		got_worktree_close(worktree);
5646 	if (pack_fds) {
5647 		const struct got_error *pack_err =
5648 		    got_repo_pack_fds_close(pack_fds);
5649 		if (error == NULL)
5650 			error = pack_err;
5651 	}
5652 	tog_free_refs();
5653 	return error;
5654 }
5655 
5656 __dead static void
5657 usage_blame(void)
5658 {
5659 	endwin();
5660 	fprintf(stderr,
5661 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5662 	    getprogname());
5663 	exit(1);
5664 }
5665 
5666 struct tog_blame_line {
5667 	int annotated;
5668 	struct got_object_id *id;
5669 };
5670 
5671 static const struct got_error *
5672 draw_blame(struct tog_view *view)
5673 {
5674 	struct tog_blame_view_state *s = &view->state.blame;
5675 	struct tog_blame *blame = &s->blame;
5676 	regmatch_t *regmatch = &view->regmatch;
5677 	const struct got_error *err;
5678 	int lineno = 0, nprinted = 0;
5679 	char *line = NULL;
5680 	size_t linesize = 0;
5681 	ssize_t linelen;
5682 	wchar_t *wline;
5683 	int width;
5684 	struct tog_blame_line *blame_line;
5685 	struct got_object_id *prev_id = NULL;
5686 	char *id_str;
5687 	struct tog_color *tc;
5688 
5689 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5690 	if (err)
5691 		return err;
5692 
5693 	rewind(blame->f);
5694 	werase(view->window);
5695 
5696 	if (asprintf(&line, "commit %s", id_str) == -1) {
5697 		err = got_error_from_errno("asprintf");
5698 		free(id_str);
5699 		return err;
5700 	}
5701 
5702 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5703 	free(line);
5704 	line = NULL;
5705 	if (err)
5706 		return err;
5707 	if (view_needs_focus_indication(view))
5708 		wstandout(view->window);
5709 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5710 	if (tc)
5711 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5712 	waddwstr(view->window, wline);
5713 	while (width++ < view->ncols)
5714 		waddch(view->window, ' ');
5715 	if (tc)
5716 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5717 	if (view_needs_focus_indication(view))
5718 		wstandend(view->window);
5719 	free(wline);
5720 	wline = NULL;
5721 
5722 	if (view->gline > blame->nlines)
5723 		view->gline = blame->nlines;
5724 
5725 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5726 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5727 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5728 		free(id_str);
5729 		return got_error_from_errno("asprintf");
5730 	}
5731 	free(id_str);
5732 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5733 	free(line);
5734 	line = NULL;
5735 	if (err)
5736 		return err;
5737 	waddwstr(view->window, wline);
5738 	free(wline);
5739 	wline = NULL;
5740 	if (width < view->ncols - 1)
5741 		waddch(view->window, '\n');
5742 
5743 	s->eof = 0;
5744 	view->maxx = 0;
5745 	while (nprinted < view->nlines - 2) {
5746 		linelen = getline(&line, &linesize, blame->f);
5747 		if (linelen == -1) {
5748 			if (feof(blame->f)) {
5749 				s->eof = 1;
5750 				break;
5751 			}
5752 			free(line);
5753 			return got_ferror(blame->f, GOT_ERR_IO);
5754 		}
5755 		if (++lineno < s->first_displayed_line)
5756 			continue;
5757 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5758 			continue;
5759 
5760 		/* Set view->maxx based on full line length. */
5761 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5762 		if (err) {
5763 			free(line);
5764 			return err;
5765 		}
5766 		free(wline);
5767 		wline = NULL;
5768 		view->maxx = MAX(view->maxx, width);
5769 
5770 		if (nprinted == s->selected_line - 1)
5771 			wstandout(view->window);
5772 
5773 		if (blame->nlines > 0) {
5774 			blame_line = &blame->lines[lineno - 1];
5775 			if (blame_line->annotated && prev_id &&
5776 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5777 			    !(nprinted == s->selected_line - 1)) {
5778 				waddstr(view->window, "        ");
5779 			} else if (blame_line->annotated) {
5780 				char *id_str;
5781 				err = got_object_id_str(&id_str,
5782 				    blame_line->id);
5783 				if (err) {
5784 					free(line);
5785 					return err;
5786 				}
5787 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5788 				if (tc)
5789 					wattr_on(view->window,
5790 					    COLOR_PAIR(tc->colorpair), NULL);
5791 				wprintw(view->window, "%.8s", id_str);
5792 				if (tc)
5793 					wattr_off(view->window,
5794 					    COLOR_PAIR(tc->colorpair), NULL);
5795 				free(id_str);
5796 				prev_id = blame_line->id;
5797 			} else {
5798 				waddstr(view->window, "........");
5799 				prev_id = NULL;
5800 			}
5801 		} else {
5802 			waddstr(view->window, "........");
5803 			prev_id = NULL;
5804 		}
5805 
5806 		if (nprinted == s->selected_line - 1)
5807 			wstandend(view->window);
5808 		waddstr(view->window, " ");
5809 
5810 		if (view->ncols <= 9) {
5811 			width = 9;
5812 		} else if (s->first_displayed_line + nprinted ==
5813 		    s->matched_line &&
5814 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5815 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5816 			    view->window, view->x, regmatch);
5817 			if (err) {
5818 				free(line);
5819 				return err;
5820 			}
5821 			width += 9;
5822 		} else {
5823 			int skip;
5824 			err = format_line(&wline, &width, &skip, line,
5825 			    view->x, view->ncols - 9, 9, 1);
5826 			if (err) {
5827 				free(line);
5828 				return err;
5829 			}
5830 			waddwstr(view->window, &wline[skip]);
5831 			width += 9;
5832 			free(wline);
5833 			wline = NULL;
5834 		}
5835 
5836 		if (width <= view->ncols - 1)
5837 			waddch(view->window, '\n');
5838 		if (++nprinted == 1)
5839 			s->first_displayed_line = lineno;
5840 	}
5841 	free(line);
5842 	s->last_displayed_line = lineno;
5843 
5844 	view_border(view);
5845 
5846 	return NULL;
5847 }
5848 
5849 static const struct got_error *
5850 blame_cb(void *arg, int nlines, int lineno,
5851     struct got_commit_object *commit, struct got_object_id *id)
5852 {
5853 	const struct got_error *err = NULL;
5854 	struct tog_blame_cb_args *a = arg;
5855 	struct tog_blame_line *line;
5856 	int errcode;
5857 
5858 	if (nlines != a->nlines ||
5859 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5860 		return got_error(GOT_ERR_RANGE);
5861 
5862 	errcode = pthread_mutex_lock(&tog_mutex);
5863 	if (errcode)
5864 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5865 
5866 	if (*a->quit) {	/* user has quit the blame view */
5867 		err = got_error(GOT_ERR_ITER_COMPLETED);
5868 		goto done;
5869 	}
5870 
5871 	if (lineno == -1)
5872 		goto done; /* no change in this commit */
5873 
5874 	line = &a->lines[lineno - 1];
5875 	if (line->annotated)
5876 		goto done;
5877 
5878 	line->id = got_object_id_dup(id);
5879 	if (line->id == NULL) {
5880 		err = got_error_from_errno("got_object_id_dup");
5881 		goto done;
5882 	}
5883 	line->annotated = 1;
5884 done:
5885 	errcode = pthread_mutex_unlock(&tog_mutex);
5886 	if (errcode)
5887 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5888 	return err;
5889 }
5890 
5891 static void *
5892 blame_thread(void *arg)
5893 {
5894 	const struct got_error *err, *close_err;
5895 	struct tog_blame_thread_args *ta = arg;
5896 	struct tog_blame_cb_args *a = ta->cb_args;
5897 	int errcode, fd1 = -1, fd2 = -1;
5898 	FILE *f1 = NULL, *f2 = NULL;
5899 
5900 	fd1 = got_opentempfd();
5901 	if (fd1 == -1)
5902 		return (void *)got_error_from_errno("got_opentempfd");
5903 
5904 	fd2 = got_opentempfd();
5905 	if (fd2 == -1) {
5906 		err = got_error_from_errno("got_opentempfd");
5907 		goto done;
5908 	}
5909 
5910 	f1 = got_opentemp();
5911 	if (f1 == NULL) {
5912 		err = (void *)got_error_from_errno("got_opentemp");
5913 		goto done;
5914 	}
5915 	f2 = got_opentemp();
5916 	if (f2 == NULL) {
5917 		err = (void *)got_error_from_errno("got_opentemp");
5918 		goto done;
5919 	}
5920 
5921 	err = block_signals_used_by_main_thread();
5922 	if (err)
5923 		goto done;
5924 
5925 	err = got_blame(ta->path, a->commit_id, ta->repo,
5926 	    tog_diff_algo, blame_cb, ta->cb_args,
5927 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5928 	if (err && err->code == GOT_ERR_CANCELLED)
5929 		err = NULL;
5930 
5931 	errcode = pthread_mutex_lock(&tog_mutex);
5932 	if (errcode) {
5933 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5934 		goto done;
5935 	}
5936 
5937 	close_err = got_repo_close(ta->repo);
5938 	if (err == NULL)
5939 		err = close_err;
5940 	ta->repo = NULL;
5941 	*ta->complete = 1;
5942 
5943 	errcode = pthread_mutex_unlock(&tog_mutex);
5944 	if (errcode && err == NULL)
5945 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5946 
5947 done:
5948 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5949 		err = got_error_from_errno("close");
5950 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5951 		err = got_error_from_errno("close");
5952 	if (f1 && fclose(f1) == EOF && err == NULL)
5953 		err = got_error_from_errno("fclose");
5954 	if (f2 && fclose(f2) == EOF && err == NULL)
5955 		err = got_error_from_errno("fclose");
5956 
5957 	return (void *)err;
5958 }
5959 
5960 static struct got_object_id *
5961 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5962     int first_displayed_line, int selected_line)
5963 {
5964 	struct tog_blame_line *line;
5965 
5966 	if (nlines <= 0)
5967 		return NULL;
5968 
5969 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5970 	if (!line->annotated)
5971 		return NULL;
5972 
5973 	return line->id;
5974 }
5975 
5976 static struct got_object_id *
5977 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5978     int lineno)
5979 {
5980 	struct tog_blame_line *line;
5981 
5982 	if (nlines <= 0 || lineno >= nlines)
5983 		return NULL;
5984 
5985 	line = &lines[lineno - 1];
5986 	if (!line->annotated)
5987 		return NULL;
5988 
5989 	return line->id;
5990 }
5991 
5992 static const struct got_error *
5993 stop_blame(struct tog_blame *blame)
5994 {
5995 	const struct got_error *err = NULL;
5996 	int i;
5997 
5998 	if (blame->thread) {
5999 		int errcode;
6000 		errcode = pthread_mutex_unlock(&tog_mutex);
6001 		if (errcode)
6002 			return got_error_set_errno(errcode,
6003 			    "pthread_mutex_unlock");
6004 		errcode = pthread_join(blame->thread, (void **)&err);
6005 		if (errcode)
6006 			return got_error_set_errno(errcode, "pthread_join");
6007 		errcode = pthread_mutex_lock(&tog_mutex);
6008 		if (errcode)
6009 			return got_error_set_errno(errcode,
6010 			    "pthread_mutex_lock");
6011 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6012 			err = NULL;
6013 		blame->thread = 0; //NULL;
6014 	}
6015 	if (blame->thread_args.repo) {
6016 		const struct got_error *close_err;
6017 		close_err = got_repo_close(blame->thread_args.repo);
6018 		if (err == NULL)
6019 			err = close_err;
6020 		blame->thread_args.repo = NULL;
6021 	}
6022 	if (blame->f) {
6023 		if (fclose(blame->f) == EOF && err == NULL)
6024 			err = got_error_from_errno("fclose");
6025 		blame->f = NULL;
6026 	}
6027 	if (blame->lines) {
6028 		for (i = 0; i < blame->nlines; i++)
6029 			free(blame->lines[i].id);
6030 		free(blame->lines);
6031 		blame->lines = NULL;
6032 	}
6033 	free(blame->cb_args.commit_id);
6034 	blame->cb_args.commit_id = NULL;
6035 	if (blame->pack_fds) {
6036 		const struct got_error *pack_err =
6037 		    got_repo_pack_fds_close(blame->pack_fds);
6038 		if (err == NULL)
6039 			err = pack_err;
6040 		blame->pack_fds = NULL;
6041 	}
6042 	return err;
6043 }
6044 
6045 static const struct got_error *
6046 cancel_blame_view(void *arg)
6047 {
6048 	const struct got_error *err = NULL;
6049 	int *done = arg;
6050 	int errcode;
6051 
6052 	errcode = pthread_mutex_lock(&tog_mutex);
6053 	if (errcode)
6054 		return got_error_set_errno(errcode,
6055 		    "pthread_mutex_unlock");
6056 
6057 	if (*done)
6058 		err = got_error(GOT_ERR_CANCELLED);
6059 
6060 	errcode = pthread_mutex_unlock(&tog_mutex);
6061 	if (errcode)
6062 		return got_error_set_errno(errcode,
6063 		    "pthread_mutex_lock");
6064 
6065 	return err;
6066 }
6067 
6068 static const struct got_error *
6069 run_blame(struct tog_view *view)
6070 {
6071 	struct tog_blame_view_state *s = &view->state.blame;
6072 	struct tog_blame *blame = &s->blame;
6073 	const struct got_error *err = NULL;
6074 	struct got_commit_object *commit = NULL;
6075 	struct got_blob_object *blob = NULL;
6076 	struct got_repository *thread_repo = NULL;
6077 	struct got_object_id *obj_id = NULL;
6078 	int obj_type, fd = -1;
6079 	int *pack_fds = NULL;
6080 
6081 	err = got_object_open_as_commit(&commit, s->repo,
6082 	    &s->blamed_commit->id);
6083 	if (err)
6084 		return err;
6085 
6086 	fd = got_opentempfd();
6087 	if (fd == -1) {
6088 		err = got_error_from_errno("got_opentempfd");
6089 		goto done;
6090 	}
6091 
6092 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6093 	if (err)
6094 		goto done;
6095 
6096 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6097 	if (err)
6098 		goto done;
6099 
6100 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6101 		err = got_error(GOT_ERR_OBJ_TYPE);
6102 		goto done;
6103 	}
6104 
6105 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6106 	if (err)
6107 		goto done;
6108 	blame->f = got_opentemp();
6109 	if (blame->f == NULL) {
6110 		err = got_error_from_errno("got_opentemp");
6111 		goto done;
6112 	}
6113 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6114 	    &blame->line_offsets, blame->f, blob);
6115 	if (err)
6116 		goto done;
6117 	if (blame->nlines == 0) {
6118 		s->blame_complete = 1;
6119 		goto done;
6120 	}
6121 
6122 	/* Don't include \n at EOF in the blame line count. */
6123 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6124 		blame->nlines--;
6125 
6126 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6127 	if (blame->lines == NULL) {
6128 		err = got_error_from_errno("calloc");
6129 		goto done;
6130 	}
6131 
6132 	err = got_repo_pack_fds_open(&pack_fds);
6133 	if (err)
6134 		goto done;
6135 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6136 	    pack_fds);
6137 	if (err)
6138 		goto done;
6139 
6140 	blame->pack_fds = pack_fds;
6141 	blame->cb_args.view = view;
6142 	blame->cb_args.lines = blame->lines;
6143 	blame->cb_args.nlines = blame->nlines;
6144 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6145 	if (blame->cb_args.commit_id == NULL) {
6146 		err = got_error_from_errno("got_object_id_dup");
6147 		goto done;
6148 	}
6149 	blame->cb_args.quit = &s->done;
6150 
6151 	blame->thread_args.path = s->path;
6152 	blame->thread_args.repo = thread_repo;
6153 	blame->thread_args.cb_args = &blame->cb_args;
6154 	blame->thread_args.complete = &s->blame_complete;
6155 	blame->thread_args.cancel_cb = cancel_blame_view;
6156 	blame->thread_args.cancel_arg = &s->done;
6157 	s->blame_complete = 0;
6158 
6159 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6160 		s->first_displayed_line = 1;
6161 		s->last_displayed_line = view->nlines;
6162 		s->selected_line = 1;
6163 	}
6164 	s->matched_line = 0;
6165 
6166 done:
6167 	if (commit)
6168 		got_object_commit_close(commit);
6169 	if (fd != -1 && close(fd) == -1 && err == NULL)
6170 		err = got_error_from_errno("close");
6171 	if (blob)
6172 		got_object_blob_close(blob);
6173 	free(obj_id);
6174 	if (err)
6175 		stop_blame(blame);
6176 	return err;
6177 }
6178 
6179 static const struct got_error *
6180 open_blame_view(struct tog_view *view, char *path,
6181     struct got_object_id *commit_id, struct got_repository *repo)
6182 {
6183 	const struct got_error *err = NULL;
6184 	struct tog_blame_view_state *s = &view->state.blame;
6185 
6186 	STAILQ_INIT(&s->blamed_commits);
6187 
6188 	s->path = strdup(path);
6189 	if (s->path == NULL)
6190 		return got_error_from_errno("strdup");
6191 
6192 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6193 	if (err) {
6194 		free(s->path);
6195 		return err;
6196 	}
6197 
6198 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6199 	s->first_displayed_line = 1;
6200 	s->last_displayed_line = view->nlines;
6201 	s->selected_line = 1;
6202 	s->blame_complete = 0;
6203 	s->repo = repo;
6204 	s->commit_id = commit_id;
6205 	memset(&s->blame, 0, sizeof(s->blame));
6206 
6207 	STAILQ_INIT(&s->colors);
6208 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6209 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6210 		    get_color_value("TOG_COLOR_COMMIT"));
6211 		if (err)
6212 			return err;
6213 	}
6214 
6215 	view->show = show_blame_view;
6216 	view->input = input_blame_view;
6217 	view->reset = reset_blame_view;
6218 	view->close = close_blame_view;
6219 	view->search_start = search_start_blame_view;
6220 	view->search_setup = search_setup_blame_view;
6221 	view->search_next = search_next_view_match;
6222 
6223 	return run_blame(view);
6224 }
6225 
6226 static const struct got_error *
6227 close_blame_view(struct tog_view *view)
6228 {
6229 	const struct got_error *err = NULL;
6230 	struct tog_blame_view_state *s = &view->state.blame;
6231 
6232 	if (s->blame.thread)
6233 		err = stop_blame(&s->blame);
6234 
6235 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6236 		struct got_object_qid *blamed_commit;
6237 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6238 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6239 		got_object_qid_free(blamed_commit);
6240 	}
6241 
6242 	free(s->path);
6243 	free_colors(&s->colors);
6244 	return err;
6245 }
6246 
6247 static const struct got_error *
6248 search_start_blame_view(struct tog_view *view)
6249 {
6250 	struct tog_blame_view_state *s = &view->state.blame;
6251 
6252 	s->matched_line = 0;
6253 	return NULL;
6254 }
6255 
6256 static void
6257 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6258     size_t *nlines, int **first, int **last, int **match, int **selected)
6259 {
6260 	struct tog_blame_view_state *s = &view->state.blame;
6261 
6262 	*f = s->blame.f;
6263 	*nlines = s->blame.nlines;
6264 	*line_offsets = s->blame.line_offsets;
6265 	*match = &s->matched_line;
6266 	*first = &s->first_displayed_line;
6267 	*last = &s->last_displayed_line;
6268 	*selected = &s->selected_line;
6269 }
6270 
6271 static const struct got_error *
6272 show_blame_view(struct tog_view *view)
6273 {
6274 	const struct got_error *err = NULL;
6275 	struct tog_blame_view_state *s = &view->state.blame;
6276 	int errcode;
6277 
6278 	if (s->blame.thread == 0 && !s->blame_complete) {
6279 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6280 		    &s->blame.thread_args);
6281 		if (errcode)
6282 			return got_error_set_errno(errcode, "pthread_create");
6283 
6284 		halfdelay(1); /* fast refresh while annotating  */
6285 	}
6286 
6287 	if (s->blame_complete)
6288 		halfdelay(10); /* disable fast refresh */
6289 
6290 	err = draw_blame(view);
6291 
6292 	view_border(view);
6293 	return err;
6294 }
6295 
6296 static const struct got_error *
6297 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6298     struct got_repository *repo, struct got_object_id *id)
6299 {
6300 	struct tog_view		*log_view;
6301 	const struct got_error	*err = NULL;
6302 
6303 	*new_view = NULL;
6304 
6305 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6306 	if (log_view == NULL)
6307 		return got_error_from_errno("view_open");
6308 
6309 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6310 	if (err)
6311 		view_close(log_view);
6312 	else
6313 		*new_view = log_view;
6314 
6315 	return err;
6316 }
6317 
6318 static const struct got_error *
6319 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6320 {
6321 	const struct got_error *err = NULL, *thread_err = NULL;
6322 	struct tog_view *diff_view;
6323 	struct tog_blame_view_state *s = &view->state.blame;
6324 	int eos, nscroll, begin_y = 0, begin_x = 0;
6325 
6326 	eos = nscroll = view->nlines - 2;
6327 	if (view_is_hsplit_top(view))
6328 		--eos;  /* border */
6329 
6330 	switch (ch) {
6331 	case '0':
6332 		view->x = 0;
6333 		break;
6334 	case '$':
6335 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6336 		view->count = 0;
6337 		break;
6338 	case KEY_RIGHT:
6339 	case 'l':
6340 		if (view->x + view->ncols / 3 < view->maxx)
6341 			view->x += 2;  /* move two columns right */
6342 		else
6343 			view->count = 0;
6344 		break;
6345 	case KEY_LEFT:
6346 	case 'h':
6347 		view->x -= MIN(view->x, 2);  /* move two columns back */
6348 		if (view->x <= 0)
6349 			view->count = 0;
6350 		break;
6351 	case 'q':
6352 		s->done = 1;
6353 		break;
6354 	case 'g':
6355 	case KEY_HOME:
6356 		s->selected_line = 1;
6357 		s->first_displayed_line = 1;
6358 		view->count = 0;
6359 		break;
6360 	case 'G':
6361 	case KEY_END:
6362 		if (s->blame.nlines < eos) {
6363 			s->selected_line = s->blame.nlines;
6364 			s->first_displayed_line = 1;
6365 		} else {
6366 			s->selected_line = eos;
6367 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6368 		}
6369 		view->count = 0;
6370 		break;
6371 	case 'k':
6372 	case KEY_UP:
6373 	case CTRL('p'):
6374 		if (s->selected_line > 1)
6375 			s->selected_line--;
6376 		else if (s->selected_line == 1 &&
6377 		    s->first_displayed_line > 1)
6378 			s->first_displayed_line--;
6379 		else
6380 			view->count = 0;
6381 		break;
6382 	case CTRL('u'):
6383 	case 'u':
6384 		nscroll /= 2;
6385 		/* FALL THROUGH */
6386 	case KEY_PPAGE:
6387 	case CTRL('b'):
6388 	case 'b':
6389 		if (s->first_displayed_line == 1) {
6390 			if (view->count > 1)
6391 				nscroll += nscroll;
6392 			s->selected_line = MAX(1, s->selected_line - nscroll);
6393 			view->count = 0;
6394 			break;
6395 		}
6396 		if (s->first_displayed_line > nscroll)
6397 			s->first_displayed_line -= nscroll;
6398 		else
6399 			s->first_displayed_line = 1;
6400 		break;
6401 	case 'j':
6402 	case KEY_DOWN:
6403 	case CTRL('n'):
6404 		if (s->selected_line < eos && s->first_displayed_line +
6405 		    s->selected_line <= s->blame.nlines)
6406 			s->selected_line++;
6407 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6408 			s->first_displayed_line++;
6409 		else
6410 			view->count = 0;
6411 		break;
6412 	case 'c':
6413 	case 'p': {
6414 		struct got_object_id *id = NULL;
6415 
6416 		view->count = 0;
6417 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6418 		    s->first_displayed_line, s->selected_line);
6419 		if (id == NULL)
6420 			break;
6421 		if (ch == 'p') {
6422 			struct got_commit_object *commit, *pcommit;
6423 			struct got_object_qid *pid;
6424 			struct got_object_id *blob_id = NULL;
6425 			int obj_type;
6426 			err = got_object_open_as_commit(&commit,
6427 			    s->repo, id);
6428 			if (err)
6429 				break;
6430 			pid = STAILQ_FIRST(
6431 			    got_object_commit_get_parent_ids(commit));
6432 			if (pid == NULL) {
6433 				got_object_commit_close(commit);
6434 				break;
6435 			}
6436 			/* Check if path history ends here. */
6437 			err = got_object_open_as_commit(&pcommit,
6438 			    s->repo, &pid->id);
6439 			if (err)
6440 				break;
6441 			err = got_object_id_by_path(&blob_id, s->repo,
6442 			    pcommit, s->path);
6443 			got_object_commit_close(pcommit);
6444 			if (err) {
6445 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6446 					err = NULL;
6447 				got_object_commit_close(commit);
6448 				break;
6449 			}
6450 			err = got_object_get_type(&obj_type, s->repo,
6451 			    blob_id);
6452 			free(blob_id);
6453 			/* Can't blame non-blob type objects. */
6454 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6455 				got_object_commit_close(commit);
6456 				break;
6457 			}
6458 			err = got_object_qid_alloc(&s->blamed_commit,
6459 			    &pid->id);
6460 			got_object_commit_close(commit);
6461 		} else {
6462 			if (got_object_id_cmp(id,
6463 			    &s->blamed_commit->id) == 0)
6464 				break;
6465 			err = got_object_qid_alloc(&s->blamed_commit,
6466 			    id);
6467 		}
6468 		if (err)
6469 			break;
6470 		s->done = 1;
6471 		thread_err = stop_blame(&s->blame);
6472 		s->done = 0;
6473 		if (thread_err)
6474 			break;
6475 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6476 		    s->blamed_commit, entry);
6477 		err = run_blame(view);
6478 		if (err)
6479 			break;
6480 		break;
6481 	}
6482 	case 'C': {
6483 		struct got_object_qid *first;
6484 
6485 		view->count = 0;
6486 		first = STAILQ_FIRST(&s->blamed_commits);
6487 		if (!got_object_id_cmp(&first->id, s->commit_id))
6488 			break;
6489 		s->done = 1;
6490 		thread_err = stop_blame(&s->blame);
6491 		s->done = 0;
6492 		if (thread_err)
6493 			break;
6494 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6495 		got_object_qid_free(s->blamed_commit);
6496 		s->blamed_commit =
6497 		    STAILQ_FIRST(&s->blamed_commits);
6498 		err = run_blame(view);
6499 		if (err)
6500 			break;
6501 		break;
6502 	}
6503 	case 'L':
6504 		view->count = 0;
6505 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6506 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6507 		if (s->id_to_log)
6508 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6509 		break;
6510 	case KEY_ENTER:
6511 	case '\r': {
6512 		struct got_object_id *id = NULL;
6513 		struct got_object_qid *pid;
6514 		struct got_commit_object *commit = NULL;
6515 
6516 		view->count = 0;
6517 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6518 		    s->first_displayed_line, s->selected_line);
6519 		if (id == NULL)
6520 			break;
6521 		err = got_object_open_as_commit(&commit, s->repo, id);
6522 		if (err)
6523 			break;
6524 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6525 		if (*new_view) {
6526 			/* traversed from diff view, release diff resources  */
6527 			err = close_diff_view(*new_view);
6528 			if (err)
6529 				break;
6530 			diff_view = *new_view;
6531 		} else {
6532 			if (view_is_parent_view(view))
6533 				view_get_split(view, &begin_y, &begin_x);
6534 
6535 			diff_view = view_open(0, 0, begin_y, begin_x,
6536 			    TOG_VIEW_DIFF);
6537 			if (diff_view == NULL) {
6538 				got_object_commit_close(commit);
6539 				err = got_error_from_errno("view_open");
6540 				break;
6541 			}
6542 		}
6543 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6544 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6545 		got_object_commit_close(commit);
6546 		if (err) {
6547 			view_close(diff_view);
6548 			break;
6549 		}
6550 		s->last_diffed_line = s->first_displayed_line - 1 +
6551 		    s->selected_line;
6552 		if (*new_view)
6553 			break;	/* still open from active diff view */
6554 		if (view_is_parent_view(view) &&
6555 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6556 			err = view_init_hsplit(view, begin_y);
6557 			if (err)
6558 				break;
6559 		}
6560 
6561 		view->focussed = 0;
6562 		diff_view->focussed = 1;
6563 		diff_view->mode = view->mode;
6564 		diff_view->nlines = view->lines - begin_y;
6565 		if (view_is_parent_view(view)) {
6566 			view_transfer_size(diff_view, view);
6567 			err = view_close_child(view);
6568 			if (err)
6569 				break;
6570 			err = view_set_child(view, diff_view);
6571 			if (err)
6572 				break;
6573 			view->focus_child = 1;
6574 		} else
6575 			*new_view = diff_view;
6576 		if (err)
6577 			break;
6578 		break;
6579 	}
6580 	case CTRL('d'):
6581 	case 'd':
6582 		nscroll /= 2;
6583 		/* FALL THROUGH */
6584 	case KEY_NPAGE:
6585 	case CTRL('f'):
6586 	case 'f':
6587 	case ' ':
6588 		if (s->last_displayed_line >= s->blame.nlines &&
6589 		    s->selected_line >= MIN(s->blame.nlines,
6590 		    view->nlines - 2)) {
6591 			view->count = 0;
6592 			break;
6593 		}
6594 		if (s->last_displayed_line >= s->blame.nlines &&
6595 		    s->selected_line < view->nlines - 2) {
6596 			s->selected_line +=
6597 			    MIN(nscroll, s->last_displayed_line -
6598 			    s->first_displayed_line - s->selected_line + 1);
6599 		}
6600 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6601 			s->first_displayed_line += nscroll;
6602 		else
6603 			s->first_displayed_line =
6604 			    s->blame.nlines - (view->nlines - 3);
6605 		break;
6606 	case KEY_RESIZE:
6607 		if (s->selected_line > view->nlines - 2) {
6608 			s->selected_line = MIN(s->blame.nlines,
6609 			    view->nlines - 2);
6610 		}
6611 		break;
6612 	default:
6613 		view->count = 0;
6614 		break;
6615 	}
6616 	return thread_err ? thread_err : err;
6617 }
6618 
6619 static const struct got_error *
6620 reset_blame_view(struct tog_view *view)
6621 {
6622 	const struct got_error *err;
6623 	struct tog_blame_view_state *s = &view->state.blame;
6624 
6625 	view->count = 0;
6626 	s->done = 1;
6627 	err = stop_blame(&s->blame);
6628 	s->done = 0;
6629 	if (err)
6630 		return err;
6631 	return run_blame(view);
6632 }
6633 
6634 static const struct got_error *
6635 cmd_blame(int argc, char *argv[])
6636 {
6637 	const struct got_error *error;
6638 	struct got_repository *repo = NULL;
6639 	struct got_worktree *worktree = NULL;
6640 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6641 	char *link_target = NULL;
6642 	struct got_object_id *commit_id = NULL;
6643 	struct got_commit_object *commit = NULL;
6644 	char *commit_id_str = NULL;
6645 	int ch;
6646 	struct tog_view *view;
6647 	int *pack_fds = NULL;
6648 
6649 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6650 		switch (ch) {
6651 		case 'c':
6652 			commit_id_str = optarg;
6653 			break;
6654 		case 'r':
6655 			repo_path = realpath(optarg, NULL);
6656 			if (repo_path == NULL)
6657 				return got_error_from_errno2("realpath",
6658 				    optarg);
6659 			break;
6660 		default:
6661 			usage_blame();
6662 			/* NOTREACHED */
6663 		}
6664 	}
6665 
6666 	argc -= optind;
6667 	argv += optind;
6668 
6669 	if (argc != 1)
6670 		usage_blame();
6671 
6672 	error = got_repo_pack_fds_open(&pack_fds);
6673 	if (error != NULL)
6674 		goto done;
6675 
6676 	if (repo_path == NULL) {
6677 		cwd = getcwd(NULL, 0);
6678 		if (cwd == NULL)
6679 			return got_error_from_errno("getcwd");
6680 		error = got_worktree_open(&worktree, cwd);
6681 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6682 			goto done;
6683 		if (worktree)
6684 			repo_path =
6685 			    strdup(got_worktree_get_repo_path(worktree));
6686 		else
6687 			repo_path = strdup(cwd);
6688 		if (repo_path == NULL) {
6689 			error = got_error_from_errno("strdup");
6690 			goto done;
6691 		}
6692 	}
6693 
6694 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6695 	if (error != NULL)
6696 		goto done;
6697 
6698 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6699 	    worktree);
6700 	if (error)
6701 		goto done;
6702 
6703 	init_curses();
6704 
6705 	error = apply_unveil(got_repo_get_path(repo), NULL);
6706 	if (error)
6707 		goto done;
6708 
6709 	error = tog_load_refs(repo, 0);
6710 	if (error)
6711 		goto done;
6712 
6713 	if (commit_id_str == NULL) {
6714 		struct got_reference *head_ref;
6715 		error = got_ref_open(&head_ref, repo, worktree ?
6716 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6717 		if (error != NULL)
6718 			goto done;
6719 		error = got_ref_resolve(&commit_id, repo, head_ref);
6720 		got_ref_close(head_ref);
6721 	} else {
6722 		error = got_repo_match_object_id(&commit_id, NULL,
6723 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6724 	}
6725 	if (error != NULL)
6726 		goto done;
6727 
6728 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6729 	if (view == NULL) {
6730 		error = got_error_from_errno("view_open");
6731 		goto done;
6732 	}
6733 
6734 	error = got_object_open_as_commit(&commit, repo, commit_id);
6735 	if (error)
6736 		goto done;
6737 
6738 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6739 	    commit, repo);
6740 	if (error)
6741 		goto done;
6742 
6743 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6744 	    commit_id, repo);
6745 	if (error)
6746 		goto done;
6747 	if (worktree) {
6748 		/* Release work tree lock. */
6749 		got_worktree_close(worktree);
6750 		worktree = NULL;
6751 	}
6752 	error = view_loop(view);
6753 done:
6754 	free(repo_path);
6755 	free(in_repo_path);
6756 	free(link_target);
6757 	free(cwd);
6758 	free(commit_id);
6759 	if (commit)
6760 		got_object_commit_close(commit);
6761 	if (worktree)
6762 		got_worktree_close(worktree);
6763 	if (repo) {
6764 		const struct got_error *close_err = got_repo_close(repo);
6765 		if (error == NULL)
6766 			error = close_err;
6767 	}
6768 	if (pack_fds) {
6769 		const struct got_error *pack_err =
6770 		    got_repo_pack_fds_close(pack_fds);
6771 		if (error == NULL)
6772 			error = pack_err;
6773 	}
6774 	tog_free_refs();
6775 	return error;
6776 }
6777 
6778 static const struct got_error *
6779 draw_tree_entries(struct tog_view *view, const char *parent_path)
6780 {
6781 	struct tog_tree_view_state *s = &view->state.tree;
6782 	const struct got_error *err = NULL;
6783 	struct got_tree_entry *te;
6784 	wchar_t *wline;
6785 	char *index = NULL;
6786 	struct tog_color *tc;
6787 	int width, n, nentries, i = 1;
6788 	int limit = view->nlines;
6789 
6790 	s->ndisplayed = 0;
6791 	if (view_is_hsplit_top(view))
6792 		--limit;  /* border */
6793 
6794 	werase(view->window);
6795 
6796 	if (limit == 0)
6797 		return NULL;
6798 
6799 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6800 	    0, 0);
6801 	if (err)
6802 		return err;
6803 	if (view_needs_focus_indication(view))
6804 		wstandout(view->window);
6805 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6806 	if (tc)
6807 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6808 	waddwstr(view->window, wline);
6809 	free(wline);
6810 	wline = NULL;
6811 	while (width++ < view->ncols)
6812 		waddch(view->window, ' ');
6813 	if (tc)
6814 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6815 	if (view_needs_focus_indication(view))
6816 		wstandend(view->window);
6817 	if (--limit <= 0)
6818 		return NULL;
6819 
6820 	i += s->selected;
6821 	if (s->first_displayed_entry) {
6822 		i += got_tree_entry_get_index(s->first_displayed_entry);
6823 		if (s->tree != s->root)
6824 			++i;  /* account for ".." entry */
6825 	}
6826 	nentries = got_object_tree_get_nentries(s->tree);
6827 	if (asprintf(&index, "[%d/%d] %s",
6828 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6829 		return got_error_from_errno("asprintf");
6830 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6831 	free(index);
6832 	if (err)
6833 		return err;
6834 	waddwstr(view->window, wline);
6835 	free(wline);
6836 	wline = NULL;
6837 	if (width < view->ncols - 1)
6838 		waddch(view->window, '\n');
6839 	if (--limit <= 0)
6840 		return NULL;
6841 	waddch(view->window, '\n');
6842 	if (--limit <= 0)
6843 		return NULL;
6844 
6845 	if (s->first_displayed_entry == NULL) {
6846 		te = got_object_tree_get_first_entry(s->tree);
6847 		if (s->selected == 0) {
6848 			if (view->focussed)
6849 				wstandout(view->window);
6850 			s->selected_entry = NULL;
6851 		}
6852 		waddstr(view->window, "  ..\n");	/* parent directory */
6853 		if (s->selected == 0 && view->focussed)
6854 			wstandend(view->window);
6855 		s->ndisplayed++;
6856 		if (--limit <= 0)
6857 			return NULL;
6858 		n = 1;
6859 	} else {
6860 		n = 0;
6861 		te = s->first_displayed_entry;
6862 	}
6863 
6864 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6865 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6866 		const char *modestr = "";
6867 		mode_t mode;
6868 
6869 		te = got_object_tree_get_entry(s->tree, i);
6870 		mode = got_tree_entry_get_mode(te);
6871 
6872 		if (s->show_ids) {
6873 			err = got_object_id_str(&id_str,
6874 			    got_tree_entry_get_id(te));
6875 			if (err)
6876 				return got_error_from_errno(
6877 				    "got_object_id_str");
6878 		}
6879 		if (got_object_tree_entry_is_submodule(te))
6880 			modestr = "$";
6881 		else if (S_ISLNK(mode)) {
6882 			int i;
6883 
6884 			err = got_tree_entry_get_symlink_target(&link_target,
6885 			    te, s->repo);
6886 			if (err) {
6887 				free(id_str);
6888 				return err;
6889 			}
6890 			for (i = 0; i < strlen(link_target); i++) {
6891 				if (!isprint((unsigned char)link_target[i]))
6892 					link_target[i] = '?';
6893 			}
6894 			modestr = "@";
6895 		}
6896 		else if (S_ISDIR(mode))
6897 			modestr = "/";
6898 		else if (mode & S_IXUSR)
6899 			modestr = "*";
6900 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6901 		    got_tree_entry_get_name(te), modestr,
6902 		    link_target ? " -> ": "",
6903 		    link_target ? link_target : "") == -1) {
6904 			free(id_str);
6905 			free(link_target);
6906 			return got_error_from_errno("asprintf");
6907 		}
6908 		free(id_str);
6909 		free(link_target);
6910 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6911 		    0, 0);
6912 		if (err) {
6913 			free(line);
6914 			break;
6915 		}
6916 		if (n == s->selected) {
6917 			if (view->focussed)
6918 				wstandout(view->window);
6919 			s->selected_entry = te;
6920 		}
6921 		tc = match_color(&s->colors, line);
6922 		if (tc)
6923 			wattr_on(view->window,
6924 			    COLOR_PAIR(tc->colorpair), NULL);
6925 		waddwstr(view->window, wline);
6926 		if (tc)
6927 			wattr_off(view->window,
6928 			    COLOR_PAIR(tc->colorpair), NULL);
6929 		if (width < view->ncols - 1)
6930 			waddch(view->window, '\n');
6931 		if (n == s->selected && view->focussed)
6932 			wstandend(view->window);
6933 		free(line);
6934 		free(wline);
6935 		wline = NULL;
6936 		n++;
6937 		s->ndisplayed++;
6938 		s->last_displayed_entry = te;
6939 		if (--limit <= 0)
6940 			break;
6941 	}
6942 
6943 	return err;
6944 }
6945 
6946 static void
6947 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6948 {
6949 	struct got_tree_entry *te;
6950 	int isroot = s->tree == s->root;
6951 	int i = 0;
6952 
6953 	if (s->first_displayed_entry == NULL)
6954 		return;
6955 
6956 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6957 	while (i++ < maxscroll) {
6958 		if (te == NULL) {
6959 			if (!isroot)
6960 				s->first_displayed_entry = NULL;
6961 			break;
6962 		}
6963 		s->first_displayed_entry = te;
6964 		te = got_tree_entry_get_prev(s->tree, te);
6965 	}
6966 }
6967 
6968 static const struct got_error *
6969 tree_scroll_down(struct tog_view *view, int maxscroll)
6970 {
6971 	struct tog_tree_view_state *s = &view->state.tree;
6972 	struct got_tree_entry *next, *last;
6973 	int n = 0;
6974 
6975 	if (s->first_displayed_entry)
6976 		next = got_tree_entry_get_next(s->tree,
6977 		    s->first_displayed_entry);
6978 	else
6979 		next = got_object_tree_get_first_entry(s->tree);
6980 
6981 	last = s->last_displayed_entry;
6982 	while (next && n++ < maxscroll) {
6983 		if (last) {
6984 			s->last_displayed_entry = last;
6985 			last = got_tree_entry_get_next(s->tree, last);
6986 		}
6987 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6988 			s->first_displayed_entry = next;
6989 			next = got_tree_entry_get_next(s->tree, next);
6990 		}
6991 	}
6992 
6993 	return NULL;
6994 }
6995 
6996 static const struct got_error *
6997 tree_entry_path(char **path, struct tog_parent_trees *parents,
6998     struct got_tree_entry *te)
6999 {
7000 	const struct got_error *err = NULL;
7001 	struct tog_parent_tree *pt;
7002 	size_t len = 2; /* for leading slash and NUL */
7003 
7004 	TAILQ_FOREACH(pt, parents, entry)
7005 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7006 		    + 1 /* slash */;
7007 	if (te)
7008 		len += strlen(got_tree_entry_get_name(te));
7009 
7010 	*path = calloc(1, len);
7011 	if (path == NULL)
7012 		return got_error_from_errno("calloc");
7013 
7014 	(*path)[0] = '/';
7015 	pt = TAILQ_LAST(parents, tog_parent_trees);
7016 	while (pt) {
7017 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7018 		if (strlcat(*path, name, len) >= len) {
7019 			err = got_error(GOT_ERR_NO_SPACE);
7020 			goto done;
7021 		}
7022 		if (strlcat(*path, "/", len) >= len) {
7023 			err = got_error(GOT_ERR_NO_SPACE);
7024 			goto done;
7025 		}
7026 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7027 	}
7028 	if (te) {
7029 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7030 			err = got_error(GOT_ERR_NO_SPACE);
7031 			goto done;
7032 		}
7033 	}
7034 done:
7035 	if (err) {
7036 		free(*path);
7037 		*path = NULL;
7038 	}
7039 	return err;
7040 }
7041 
7042 static const struct got_error *
7043 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7044     struct got_tree_entry *te, struct tog_parent_trees *parents,
7045     struct got_object_id *commit_id, struct got_repository *repo)
7046 {
7047 	const struct got_error *err = NULL;
7048 	char *path;
7049 	struct tog_view *blame_view;
7050 
7051 	*new_view = NULL;
7052 
7053 	err = tree_entry_path(&path, parents, te);
7054 	if (err)
7055 		return err;
7056 
7057 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7058 	if (blame_view == NULL) {
7059 		err = got_error_from_errno("view_open");
7060 		goto done;
7061 	}
7062 
7063 	err = open_blame_view(blame_view, path, commit_id, repo);
7064 	if (err) {
7065 		if (err->code == GOT_ERR_CANCELLED)
7066 			err = NULL;
7067 		view_close(blame_view);
7068 	} else
7069 		*new_view = blame_view;
7070 done:
7071 	free(path);
7072 	return err;
7073 }
7074 
7075 static const struct got_error *
7076 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7077     struct tog_tree_view_state *s)
7078 {
7079 	struct tog_view *log_view;
7080 	const struct got_error *err = NULL;
7081 	char *path;
7082 
7083 	*new_view = NULL;
7084 
7085 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7086 	if (log_view == NULL)
7087 		return got_error_from_errno("view_open");
7088 
7089 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7090 	if (err)
7091 		return err;
7092 
7093 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7094 	    path, 0);
7095 	if (err)
7096 		view_close(log_view);
7097 	else
7098 		*new_view = log_view;
7099 	free(path);
7100 	return err;
7101 }
7102 
7103 static const struct got_error *
7104 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7105     const char *head_ref_name, struct got_repository *repo)
7106 {
7107 	const struct got_error *err = NULL;
7108 	char *commit_id_str = NULL;
7109 	struct tog_tree_view_state *s = &view->state.tree;
7110 	struct got_commit_object *commit = NULL;
7111 
7112 	TAILQ_INIT(&s->parents);
7113 	STAILQ_INIT(&s->colors);
7114 
7115 	s->commit_id = got_object_id_dup(commit_id);
7116 	if (s->commit_id == NULL)
7117 		return got_error_from_errno("got_object_id_dup");
7118 
7119 	err = got_object_open_as_commit(&commit, repo, commit_id);
7120 	if (err)
7121 		goto done;
7122 
7123 	/*
7124 	 * The root is opened here and will be closed when the view is closed.
7125 	 * Any visited subtrees and their path-wise parents are opened and
7126 	 * closed on demand.
7127 	 */
7128 	err = got_object_open_as_tree(&s->root, repo,
7129 	    got_object_commit_get_tree_id(commit));
7130 	if (err)
7131 		goto done;
7132 	s->tree = s->root;
7133 
7134 	err = got_object_id_str(&commit_id_str, commit_id);
7135 	if (err != NULL)
7136 		goto done;
7137 
7138 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7139 		err = got_error_from_errno("asprintf");
7140 		goto done;
7141 	}
7142 
7143 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7144 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7145 	if (head_ref_name) {
7146 		s->head_ref_name = strdup(head_ref_name);
7147 		if (s->head_ref_name == NULL) {
7148 			err = got_error_from_errno("strdup");
7149 			goto done;
7150 		}
7151 	}
7152 	s->repo = repo;
7153 
7154 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7155 		err = add_color(&s->colors, "\\$$",
7156 		    TOG_COLOR_TREE_SUBMODULE,
7157 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7158 		if (err)
7159 			goto done;
7160 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7161 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7162 		if (err)
7163 			goto done;
7164 		err = add_color(&s->colors, "/$",
7165 		    TOG_COLOR_TREE_DIRECTORY,
7166 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7167 		if (err)
7168 			goto done;
7169 
7170 		err = add_color(&s->colors, "\\*$",
7171 		    TOG_COLOR_TREE_EXECUTABLE,
7172 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7173 		if (err)
7174 			goto done;
7175 
7176 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7177 		    get_color_value("TOG_COLOR_COMMIT"));
7178 		if (err)
7179 			goto done;
7180 	}
7181 
7182 	view->show = show_tree_view;
7183 	view->input = input_tree_view;
7184 	view->close = close_tree_view;
7185 	view->search_start = search_start_tree_view;
7186 	view->search_next = search_next_tree_view;
7187 done:
7188 	free(commit_id_str);
7189 	if (commit)
7190 		got_object_commit_close(commit);
7191 	if (err)
7192 		close_tree_view(view);
7193 	return err;
7194 }
7195 
7196 static const struct got_error *
7197 close_tree_view(struct tog_view *view)
7198 {
7199 	struct tog_tree_view_state *s = &view->state.tree;
7200 
7201 	free_colors(&s->colors);
7202 	free(s->tree_label);
7203 	s->tree_label = NULL;
7204 	free(s->commit_id);
7205 	s->commit_id = NULL;
7206 	free(s->head_ref_name);
7207 	s->head_ref_name = NULL;
7208 	while (!TAILQ_EMPTY(&s->parents)) {
7209 		struct tog_parent_tree *parent;
7210 		parent = TAILQ_FIRST(&s->parents);
7211 		TAILQ_REMOVE(&s->parents, parent, entry);
7212 		if (parent->tree != s->root)
7213 			got_object_tree_close(parent->tree);
7214 		free(parent);
7215 
7216 	}
7217 	if (s->tree != NULL && s->tree != s->root)
7218 		got_object_tree_close(s->tree);
7219 	if (s->root)
7220 		got_object_tree_close(s->root);
7221 	return NULL;
7222 }
7223 
7224 static const struct got_error *
7225 search_start_tree_view(struct tog_view *view)
7226 {
7227 	struct tog_tree_view_state *s = &view->state.tree;
7228 
7229 	s->matched_entry = NULL;
7230 	return NULL;
7231 }
7232 
7233 static int
7234 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7235 {
7236 	regmatch_t regmatch;
7237 
7238 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7239 	    0) == 0;
7240 }
7241 
7242 static const struct got_error *
7243 search_next_tree_view(struct tog_view *view)
7244 {
7245 	struct tog_tree_view_state *s = &view->state.tree;
7246 	struct got_tree_entry *te = NULL;
7247 
7248 	if (!view->searching) {
7249 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7250 		return NULL;
7251 	}
7252 
7253 	if (s->matched_entry) {
7254 		if (view->searching == TOG_SEARCH_FORWARD) {
7255 			if (s->selected_entry)
7256 				te = got_tree_entry_get_next(s->tree,
7257 				    s->selected_entry);
7258 			else
7259 				te = got_object_tree_get_first_entry(s->tree);
7260 		} else {
7261 			if (s->selected_entry == NULL)
7262 				te = got_object_tree_get_last_entry(s->tree);
7263 			else
7264 				te = got_tree_entry_get_prev(s->tree,
7265 				    s->selected_entry);
7266 		}
7267 	} else {
7268 		if (s->selected_entry)
7269 			te = s->selected_entry;
7270 		else if (view->searching == TOG_SEARCH_FORWARD)
7271 			te = got_object_tree_get_first_entry(s->tree);
7272 		else
7273 			te = got_object_tree_get_last_entry(s->tree);
7274 	}
7275 
7276 	while (1) {
7277 		if (te == NULL) {
7278 			if (s->matched_entry == NULL) {
7279 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7280 				return NULL;
7281 			}
7282 			if (view->searching == TOG_SEARCH_FORWARD)
7283 				te = got_object_tree_get_first_entry(s->tree);
7284 			else
7285 				te = got_object_tree_get_last_entry(s->tree);
7286 		}
7287 
7288 		if (match_tree_entry(te, &view->regex)) {
7289 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7290 			s->matched_entry = te;
7291 			break;
7292 		}
7293 
7294 		if (view->searching == TOG_SEARCH_FORWARD)
7295 			te = got_tree_entry_get_next(s->tree, te);
7296 		else
7297 			te = got_tree_entry_get_prev(s->tree, te);
7298 	}
7299 
7300 	if (s->matched_entry) {
7301 		s->first_displayed_entry = s->matched_entry;
7302 		s->selected = 0;
7303 	}
7304 
7305 	return NULL;
7306 }
7307 
7308 static const struct got_error *
7309 show_tree_view(struct tog_view *view)
7310 {
7311 	const struct got_error *err = NULL;
7312 	struct tog_tree_view_state *s = &view->state.tree;
7313 	char *parent_path;
7314 
7315 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7316 	if (err)
7317 		return err;
7318 
7319 	err = draw_tree_entries(view, parent_path);
7320 	free(parent_path);
7321 
7322 	view_border(view);
7323 	return err;
7324 }
7325 
7326 static const struct got_error *
7327 tree_goto_line(struct tog_view *view, int nlines)
7328 {
7329 	const struct got_error		 *err = NULL;
7330 	struct tog_tree_view_state	 *s = &view->state.tree;
7331 	struct got_tree_entry		**fte, **lte, **ste;
7332 	int				  g, last, first = 1, i = 1;
7333 	int				  root = s->tree == s->root;
7334 	int				  off = root ? 1 : 2;
7335 
7336 	g = view->gline;
7337 	view->gline = 0;
7338 
7339 	if (g == 0)
7340 		g = 1;
7341 	else if (g > got_object_tree_get_nentries(s->tree))
7342 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7343 
7344 	fte = &s->first_displayed_entry;
7345 	lte = &s->last_displayed_entry;
7346 	ste = &s->selected_entry;
7347 
7348 	if (*fte != NULL) {
7349 		first = got_tree_entry_get_index(*fte);
7350 		first += off;  /* account for ".." */
7351 	}
7352 	last = got_tree_entry_get_index(*lte);
7353 	last += off;
7354 
7355 	if (g >= first && g <= last && g - first < nlines) {
7356 		s->selected = g - first;
7357 		return NULL;	/* gline is on the current page */
7358 	}
7359 
7360 	if (*ste != NULL) {
7361 		i = got_tree_entry_get_index(*ste);
7362 		i += off;
7363 	}
7364 
7365 	if (i < g) {
7366 		err = tree_scroll_down(view, g - i);
7367 		if (err)
7368 			return err;
7369 		if (got_tree_entry_get_index(*lte) >=
7370 		    got_object_tree_get_nentries(s->tree) - 1 &&
7371 		    first + s->selected < g &&
7372 		    s->selected < s->ndisplayed - 1) {
7373 			first = got_tree_entry_get_index(*fte);
7374 			first += off;
7375 			s->selected = g - first;
7376 		}
7377 	} else if (i > g)
7378 		tree_scroll_up(s, i - g);
7379 
7380 	if (g < nlines &&
7381 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7382 		s->selected = g - 1;
7383 
7384 	return NULL;
7385 }
7386 
7387 static const struct got_error *
7388 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7389 {
7390 	const struct got_error *err = NULL;
7391 	struct tog_tree_view_state *s = &view->state.tree;
7392 	struct got_tree_entry *te;
7393 	int n, nscroll = view->nlines - 3;
7394 
7395 	if (view->gline)
7396 		return tree_goto_line(view, nscroll);
7397 
7398 	switch (ch) {
7399 	case 'i':
7400 		s->show_ids = !s->show_ids;
7401 		view->count = 0;
7402 		break;
7403 	case 'L':
7404 		view->count = 0;
7405 		if (!s->selected_entry)
7406 			break;
7407 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7408 		break;
7409 	case 'R':
7410 		view->count = 0;
7411 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7412 		break;
7413 	case 'g':
7414 	case '=':
7415 	case KEY_HOME:
7416 		s->selected = 0;
7417 		view->count = 0;
7418 		if (s->tree == s->root)
7419 			s->first_displayed_entry =
7420 			    got_object_tree_get_first_entry(s->tree);
7421 		else
7422 			s->first_displayed_entry = NULL;
7423 		break;
7424 	case 'G':
7425 	case '*':
7426 	case KEY_END: {
7427 		int eos = view->nlines - 3;
7428 
7429 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7430 			--eos;  /* border */
7431 		s->selected = 0;
7432 		view->count = 0;
7433 		te = got_object_tree_get_last_entry(s->tree);
7434 		for (n = 0; n < eos; n++) {
7435 			if (te == NULL) {
7436 				if (s->tree != s->root) {
7437 					s->first_displayed_entry = NULL;
7438 					n++;
7439 				}
7440 				break;
7441 			}
7442 			s->first_displayed_entry = te;
7443 			te = got_tree_entry_get_prev(s->tree, te);
7444 		}
7445 		if (n > 0)
7446 			s->selected = n - 1;
7447 		break;
7448 	}
7449 	case 'k':
7450 	case KEY_UP:
7451 	case CTRL('p'):
7452 		if (s->selected > 0) {
7453 			s->selected--;
7454 			break;
7455 		}
7456 		tree_scroll_up(s, 1);
7457 		if (s->selected_entry == NULL ||
7458 		    (s->tree == s->root && s->selected_entry ==
7459 		     got_object_tree_get_first_entry(s->tree)))
7460 			view->count = 0;
7461 		break;
7462 	case CTRL('u'):
7463 	case 'u':
7464 		nscroll /= 2;
7465 		/* FALL THROUGH */
7466 	case KEY_PPAGE:
7467 	case CTRL('b'):
7468 	case 'b':
7469 		if (s->tree == s->root) {
7470 			if (got_object_tree_get_first_entry(s->tree) ==
7471 			    s->first_displayed_entry)
7472 				s->selected -= MIN(s->selected, nscroll);
7473 		} else {
7474 			if (s->first_displayed_entry == NULL)
7475 				s->selected -= MIN(s->selected, nscroll);
7476 		}
7477 		tree_scroll_up(s, MAX(0, nscroll));
7478 		if (s->selected_entry == NULL ||
7479 		    (s->tree == s->root && s->selected_entry ==
7480 		     got_object_tree_get_first_entry(s->tree)))
7481 			view->count = 0;
7482 		break;
7483 	case 'j':
7484 	case KEY_DOWN:
7485 	case CTRL('n'):
7486 		if (s->selected < s->ndisplayed - 1) {
7487 			s->selected++;
7488 			break;
7489 		}
7490 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7491 		    == NULL) {
7492 			/* can't scroll any further */
7493 			view->count = 0;
7494 			break;
7495 		}
7496 		tree_scroll_down(view, 1);
7497 		break;
7498 	case CTRL('d'):
7499 	case 'd':
7500 		nscroll /= 2;
7501 		/* FALL THROUGH */
7502 	case KEY_NPAGE:
7503 	case CTRL('f'):
7504 	case 'f':
7505 	case ' ':
7506 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7507 		    == NULL) {
7508 			/* can't scroll any further; move cursor down */
7509 			if (s->selected < s->ndisplayed - 1)
7510 				s->selected += MIN(nscroll,
7511 				    s->ndisplayed - s->selected - 1);
7512 			else
7513 				view->count = 0;
7514 			break;
7515 		}
7516 		tree_scroll_down(view, nscroll);
7517 		break;
7518 	case KEY_ENTER:
7519 	case '\r':
7520 	case KEY_BACKSPACE:
7521 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7522 			struct tog_parent_tree *parent;
7523 			/* user selected '..' */
7524 			if (s->tree == s->root) {
7525 				view->count = 0;
7526 				break;
7527 			}
7528 			parent = TAILQ_FIRST(&s->parents);
7529 			TAILQ_REMOVE(&s->parents, parent,
7530 			    entry);
7531 			got_object_tree_close(s->tree);
7532 			s->tree = parent->tree;
7533 			s->first_displayed_entry =
7534 			    parent->first_displayed_entry;
7535 			s->selected_entry =
7536 			    parent->selected_entry;
7537 			s->selected = parent->selected;
7538 			if (s->selected > view->nlines - 3) {
7539 				err = offset_selection_down(view);
7540 				if (err)
7541 					break;
7542 			}
7543 			free(parent);
7544 		} else if (S_ISDIR(got_tree_entry_get_mode(
7545 		    s->selected_entry))) {
7546 			struct got_tree_object *subtree;
7547 			view->count = 0;
7548 			err = got_object_open_as_tree(&subtree, s->repo,
7549 			    got_tree_entry_get_id(s->selected_entry));
7550 			if (err)
7551 				break;
7552 			err = tree_view_visit_subtree(s, subtree);
7553 			if (err) {
7554 				got_object_tree_close(subtree);
7555 				break;
7556 			}
7557 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7558 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7559 		break;
7560 	case KEY_RESIZE:
7561 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7562 			s->selected = view->nlines - 4;
7563 		view->count = 0;
7564 		break;
7565 	default:
7566 		view->count = 0;
7567 		break;
7568 	}
7569 
7570 	return err;
7571 }
7572 
7573 __dead static void
7574 usage_tree(void)
7575 {
7576 	endwin();
7577 	fprintf(stderr,
7578 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7579 	    getprogname());
7580 	exit(1);
7581 }
7582 
7583 static const struct got_error *
7584 cmd_tree(int argc, char *argv[])
7585 {
7586 	const struct got_error *error;
7587 	struct got_repository *repo = NULL;
7588 	struct got_worktree *worktree = NULL;
7589 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7590 	struct got_object_id *commit_id = NULL;
7591 	struct got_commit_object *commit = NULL;
7592 	const char *commit_id_arg = NULL;
7593 	char *label = NULL;
7594 	struct got_reference *ref = NULL;
7595 	const char *head_ref_name = NULL;
7596 	int ch;
7597 	struct tog_view *view;
7598 	int *pack_fds = NULL;
7599 
7600 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7601 		switch (ch) {
7602 		case 'c':
7603 			commit_id_arg = optarg;
7604 			break;
7605 		case 'r':
7606 			repo_path = realpath(optarg, NULL);
7607 			if (repo_path == NULL)
7608 				return got_error_from_errno2("realpath",
7609 				    optarg);
7610 			break;
7611 		default:
7612 			usage_tree();
7613 			/* NOTREACHED */
7614 		}
7615 	}
7616 
7617 	argc -= optind;
7618 	argv += optind;
7619 
7620 	if (argc > 1)
7621 		usage_tree();
7622 
7623 	error = got_repo_pack_fds_open(&pack_fds);
7624 	if (error != NULL)
7625 		goto done;
7626 
7627 	if (repo_path == NULL) {
7628 		cwd = getcwd(NULL, 0);
7629 		if (cwd == NULL)
7630 			return got_error_from_errno("getcwd");
7631 		error = got_worktree_open(&worktree, cwd);
7632 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7633 			goto done;
7634 		if (worktree)
7635 			repo_path =
7636 			    strdup(got_worktree_get_repo_path(worktree));
7637 		else
7638 			repo_path = strdup(cwd);
7639 		if (repo_path == NULL) {
7640 			error = got_error_from_errno("strdup");
7641 			goto done;
7642 		}
7643 	}
7644 
7645 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7646 	if (error != NULL)
7647 		goto done;
7648 
7649 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7650 	    repo, worktree);
7651 	if (error)
7652 		goto done;
7653 
7654 	init_curses();
7655 
7656 	error = apply_unveil(got_repo_get_path(repo), NULL);
7657 	if (error)
7658 		goto done;
7659 
7660 	error = tog_load_refs(repo, 0);
7661 	if (error)
7662 		goto done;
7663 
7664 	if (commit_id_arg == NULL) {
7665 		error = got_repo_match_object_id(&commit_id, &label,
7666 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7667 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7668 		if (error)
7669 			goto done;
7670 		head_ref_name = label;
7671 	} else {
7672 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7673 		if (error == NULL)
7674 			head_ref_name = got_ref_get_name(ref);
7675 		else if (error->code != GOT_ERR_NOT_REF)
7676 			goto done;
7677 		error = got_repo_match_object_id(&commit_id, NULL,
7678 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7679 		if (error)
7680 			goto done;
7681 	}
7682 
7683 	error = got_object_open_as_commit(&commit, repo, commit_id);
7684 	if (error)
7685 		goto done;
7686 
7687 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7688 	if (view == NULL) {
7689 		error = got_error_from_errno("view_open");
7690 		goto done;
7691 	}
7692 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7693 	if (error)
7694 		goto done;
7695 	if (!got_path_is_root_dir(in_repo_path)) {
7696 		error = tree_view_walk_path(&view->state.tree, commit,
7697 		    in_repo_path);
7698 		if (error)
7699 			goto done;
7700 	}
7701 
7702 	if (worktree) {
7703 		/* Release work tree lock. */
7704 		got_worktree_close(worktree);
7705 		worktree = NULL;
7706 	}
7707 	error = view_loop(view);
7708 done:
7709 	free(repo_path);
7710 	free(cwd);
7711 	free(commit_id);
7712 	free(label);
7713 	if (ref)
7714 		got_ref_close(ref);
7715 	if (repo) {
7716 		const struct got_error *close_err = got_repo_close(repo);
7717 		if (error == NULL)
7718 			error = close_err;
7719 	}
7720 	if (pack_fds) {
7721 		const struct got_error *pack_err =
7722 		    got_repo_pack_fds_close(pack_fds);
7723 		if (error == NULL)
7724 			error = pack_err;
7725 	}
7726 	tog_free_refs();
7727 	return error;
7728 }
7729 
7730 static const struct got_error *
7731 ref_view_load_refs(struct tog_ref_view_state *s)
7732 {
7733 	struct got_reflist_entry *sre;
7734 	struct tog_reflist_entry *re;
7735 
7736 	s->nrefs = 0;
7737 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7738 		if (strncmp(got_ref_get_name(sre->ref),
7739 		    "refs/got/", 9) == 0 &&
7740 		    strncmp(got_ref_get_name(sre->ref),
7741 		    "refs/got/backup/", 16) != 0)
7742 			continue;
7743 
7744 		re = malloc(sizeof(*re));
7745 		if (re == NULL)
7746 			return got_error_from_errno("malloc");
7747 
7748 		re->ref = got_ref_dup(sre->ref);
7749 		if (re->ref == NULL)
7750 			return got_error_from_errno("got_ref_dup");
7751 		re->idx = s->nrefs++;
7752 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7753 	}
7754 
7755 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7756 	return NULL;
7757 }
7758 
7759 static void
7760 ref_view_free_refs(struct tog_ref_view_state *s)
7761 {
7762 	struct tog_reflist_entry *re;
7763 
7764 	while (!TAILQ_EMPTY(&s->refs)) {
7765 		re = TAILQ_FIRST(&s->refs);
7766 		TAILQ_REMOVE(&s->refs, re, entry);
7767 		got_ref_close(re->ref);
7768 		free(re);
7769 	}
7770 }
7771 
7772 static const struct got_error *
7773 open_ref_view(struct tog_view *view, struct got_repository *repo)
7774 {
7775 	const struct got_error *err = NULL;
7776 	struct tog_ref_view_state *s = &view->state.ref;
7777 
7778 	s->selected_entry = 0;
7779 	s->repo = repo;
7780 
7781 	TAILQ_INIT(&s->refs);
7782 	STAILQ_INIT(&s->colors);
7783 
7784 	err = ref_view_load_refs(s);
7785 	if (err)
7786 		return err;
7787 
7788 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7789 		err = add_color(&s->colors, "^refs/heads/",
7790 		    TOG_COLOR_REFS_HEADS,
7791 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7792 		if (err)
7793 			goto done;
7794 
7795 		err = add_color(&s->colors, "^refs/tags/",
7796 		    TOG_COLOR_REFS_TAGS,
7797 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7798 		if (err)
7799 			goto done;
7800 
7801 		err = add_color(&s->colors, "^refs/remotes/",
7802 		    TOG_COLOR_REFS_REMOTES,
7803 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7804 		if (err)
7805 			goto done;
7806 
7807 		err = add_color(&s->colors, "^refs/got/backup/",
7808 		    TOG_COLOR_REFS_BACKUP,
7809 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7810 		if (err)
7811 			goto done;
7812 	}
7813 
7814 	view->show = show_ref_view;
7815 	view->input = input_ref_view;
7816 	view->close = close_ref_view;
7817 	view->search_start = search_start_ref_view;
7818 	view->search_next = search_next_ref_view;
7819 done:
7820 	if (err)
7821 		free_colors(&s->colors);
7822 	return err;
7823 }
7824 
7825 static const struct got_error *
7826 close_ref_view(struct tog_view *view)
7827 {
7828 	struct tog_ref_view_state *s = &view->state.ref;
7829 
7830 	ref_view_free_refs(s);
7831 	free_colors(&s->colors);
7832 
7833 	return NULL;
7834 }
7835 
7836 static const struct got_error *
7837 resolve_reflist_entry(struct got_object_id **commit_id,
7838     struct tog_reflist_entry *re, struct got_repository *repo)
7839 {
7840 	const struct got_error *err = NULL;
7841 	struct got_object_id *obj_id;
7842 	struct got_tag_object *tag = NULL;
7843 	int obj_type;
7844 
7845 	*commit_id = NULL;
7846 
7847 	err = got_ref_resolve(&obj_id, repo, re->ref);
7848 	if (err)
7849 		return err;
7850 
7851 	err = got_object_get_type(&obj_type, repo, obj_id);
7852 	if (err)
7853 		goto done;
7854 
7855 	switch (obj_type) {
7856 	case GOT_OBJ_TYPE_COMMIT:
7857 		*commit_id = obj_id;
7858 		break;
7859 	case GOT_OBJ_TYPE_TAG:
7860 		err = got_object_open_as_tag(&tag, repo, obj_id);
7861 		if (err)
7862 			goto done;
7863 		free(obj_id);
7864 		err = got_object_get_type(&obj_type, repo,
7865 		    got_object_tag_get_object_id(tag));
7866 		if (err)
7867 			goto done;
7868 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7869 			err = got_error(GOT_ERR_OBJ_TYPE);
7870 			goto done;
7871 		}
7872 		*commit_id = got_object_id_dup(
7873 		    got_object_tag_get_object_id(tag));
7874 		if (*commit_id == NULL) {
7875 			err = got_error_from_errno("got_object_id_dup");
7876 			goto done;
7877 		}
7878 		break;
7879 	default:
7880 		err = got_error(GOT_ERR_OBJ_TYPE);
7881 		break;
7882 	}
7883 
7884 done:
7885 	if (tag)
7886 		got_object_tag_close(tag);
7887 	if (err) {
7888 		free(*commit_id);
7889 		*commit_id = NULL;
7890 	}
7891 	return err;
7892 }
7893 
7894 static const struct got_error *
7895 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7896     struct tog_reflist_entry *re, struct got_repository *repo)
7897 {
7898 	struct tog_view *log_view;
7899 	const struct got_error *err = NULL;
7900 	struct got_object_id *commit_id = NULL;
7901 
7902 	*new_view = NULL;
7903 
7904 	err = resolve_reflist_entry(&commit_id, re, repo);
7905 	if (err) {
7906 		if (err->code != GOT_ERR_OBJ_TYPE)
7907 			return err;
7908 		else
7909 			return NULL;
7910 	}
7911 
7912 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7913 	if (log_view == NULL) {
7914 		err = got_error_from_errno("view_open");
7915 		goto done;
7916 	}
7917 
7918 	err = open_log_view(log_view, commit_id, repo,
7919 	    got_ref_get_name(re->ref), "", 0);
7920 done:
7921 	if (err)
7922 		view_close(log_view);
7923 	else
7924 		*new_view = log_view;
7925 	free(commit_id);
7926 	return err;
7927 }
7928 
7929 static void
7930 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7931 {
7932 	struct tog_reflist_entry *re;
7933 	int i = 0;
7934 
7935 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7936 		return;
7937 
7938 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7939 	while (i++ < maxscroll) {
7940 		if (re == NULL)
7941 			break;
7942 		s->first_displayed_entry = re;
7943 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7944 	}
7945 }
7946 
7947 static const struct got_error *
7948 ref_scroll_down(struct tog_view *view, int maxscroll)
7949 {
7950 	struct tog_ref_view_state *s = &view->state.ref;
7951 	struct tog_reflist_entry *next, *last;
7952 	int n = 0;
7953 
7954 	if (s->first_displayed_entry)
7955 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7956 	else
7957 		next = TAILQ_FIRST(&s->refs);
7958 
7959 	last = s->last_displayed_entry;
7960 	while (next && n++ < maxscroll) {
7961 		if (last) {
7962 			s->last_displayed_entry = last;
7963 			last = TAILQ_NEXT(last, entry);
7964 		}
7965 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7966 			s->first_displayed_entry = next;
7967 			next = TAILQ_NEXT(next, entry);
7968 		}
7969 	}
7970 
7971 	return NULL;
7972 }
7973 
7974 static const struct got_error *
7975 search_start_ref_view(struct tog_view *view)
7976 {
7977 	struct tog_ref_view_state *s = &view->state.ref;
7978 
7979 	s->matched_entry = NULL;
7980 	return NULL;
7981 }
7982 
7983 static int
7984 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7985 {
7986 	regmatch_t regmatch;
7987 
7988 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7989 	    0) == 0;
7990 }
7991 
7992 static const struct got_error *
7993 search_next_ref_view(struct tog_view *view)
7994 {
7995 	struct tog_ref_view_state *s = &view->state.ref;
7996 	struct tog_reflist_entry *re = NULL;
7997 
7998 	if (!view->searching) {
7999 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8000 		return NULL;
8001 	}
8002 
8003 	if (s->matched_entry) {
8004 		if (view->searching == TOG_SEARCH_FORWARD) {
8005 			if (s->selected_entry)
8006 				re = TAILQ_NEXT(s->selected_entry, entry);
8007 			else
8008 				re = TAILQ_PREV(s->selected_entry,
8009 				    tog_reflist_head, entry);
8010 		} else {
8011 			if (s->selected_entry == NULL)
8012 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8013 			else
8014 				re = TAILQ_PREV(s->selected_entry,
8015 				    tog_reflist_head, entry);
8016 		}
8017 	} else {
8018 		if (s->selected_entry)
8019 			re = s->selected_entry;
8020 		else if (view->searching == TOG_SEARCH_FORWARD)
8021 			re = TAILQ_FIRST(&s->refs);
8022 		else
8023 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8024 	}
8025 
8026 	while (1) {
8027 		if (re == NULL) {
8028 			if (s->matched_entry == NULL) {
8029 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8030 				return NULL;
8031 			}
8032 			if (view->searching == TOG_SEARCH_FORWARD)
8033 				re = TAILQ_FIRST(&s->refs);
8034 			else
8035 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8036 		}
8037 
8038 		if (match_reflist_entry(re, &view->regex)) {
8039 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8040 			s->matched_entry = re;
8041 			break;
8042 		}
8043 
8044 		if (view->searching == TOG_SEARCH_FORWARD)
8045 			re = TAILQ_NEXT(re, entry);
8046 		else
8047 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8048 	}
8049 
8050 	if (s->matched_entry) {
8051 		s->first_displayed_entry = s->matched_entry;
8052 		s->selected = 0;
8053 	}
8054 
8055 	return NULL;
8056 }
8057 
8058 static const struct got_error *
8059 show_ref_view(struct tog_view *view)
8060 {
8061 	const struct got_error *err = NULL;
8062 	struct tog_ref_view_state *s = &view->state.ref;
8063 	struct tog_reflist_entry *re;
8064 	char *line = NULL;
8065 	wchar_t *wline;
8066 	struct tog_color *tc;
8067 	int width, n;
8068 	int limit = view->nlines;
8069 
8070 	werase(view->window);
8071 
8072 	s->ndisplayed = 0;
8073 	if (view_is_hsplit_top(view))
8074 		--limit;  /* border */
8075 
8076 	if (limit == 0)
8077 		return NULL;
8078 
8079 	re = s->first_displayed_entry;
8080 
8081 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8082 	    s->nrefs) == -1)
8083 		return got_error_from_errno("asprintf");
8084 
8085 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8086 	if (err) {
8087 		free(line);
8088 		return err;
8089 	}
8090 	if (view_needs_focus_indication(view))
8091 		wstandout(view->window);
8092 	waddwstr(view->window, wline);
8093 	while (width++ < view->ncols)
8094 		waddch(view->window, ' ');
8095 	if (view_needs_focus_indication(view))
8096 		wstandend(view->window);
8097 	free(wline);
8098 	wline = NULL;
8099 	free(line);
8100 	line = NULL;
8101 	if (--limit <= 0)
8102 		return NULL;
8103 
8104 	n = 0;
8105 	while (re && limit > 0) {
8106 		char *line = NULL;
8107 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8108 
8109 		if (s->show_date) {
8110 			struct got_commit_object *ci;
8111 			struct got_tag_object *tag;
8112 			struct got_object_id *id;
8113 			struct tm tm;
8114 			time_t t;
8115 
8116 			err = got_ref_resolve(&id, s->repo, re->ref);
8117 			if (err)
8118 				return err;
8119 			err = got_object_open_as_tag(&tag, s->repo, id);
8120 			if (err) {
8121 				if (err->code != GOT_ERR_OBJ_TYPE) {
8122 					free(id);
8123 					return err;
8124 				}
8125 				err = got_object_open_as_commit(&ci, s->repo,
8126 				    id);
8127 				if (err) {
8128 					free(id);
8129 					return err;
8130 				}
8131 				t = got_object_commit_get_committer_time(ci);
8132 				got_object_commit_close(ci);
8133 			} else {
8134 				t = got_object_tag_get_tagger_time(tag);
8135 				got_object_tag_close(tag);
8136 			}
8137 			free(id);
8138 			if (gmtime_r(&t, &tm) == NULL)
8139 				return got_error_from_errno("gmtime_r");
8140 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8141 				return got_error(GOT_ERR_NO_SPACE);
8142 		}
8143 		if (got_ref_is_symbolic(re->ref)) {
8144 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8145 			    ymd : "", got_ref_get_name(re->ref),
8146 			    got_ref_get_symref_target(re->ref)) == -1)
8147 				return got_error_from_errno("asprintf");
8148 		} else if (s->show_ids) {
8149 			struct got_object_id *id;
8150 			char *id_str;
8151 			err = got_ref_resolve(&id, s->repo, re->ref);
8152 			if (err)
8153 				return err;
8154 			err = got_object_id_str(&id_str, id);
8155 			if (err) {
8156 				free(id);
8157 				return err;
8158 			}
8159 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8160 			    got_ref_get_name(re->ref), id_str) == -1) {
8161 				err = got_error_from_errno("asprintf");
8162 				free(id);
8163 				free(id_str);
8164 				return err;
8165 			}
8166 			free(id);
8167 			free(id_str);
8168 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8169 		    got_ref_get_name(re->ref)) == -1)
8170 			return got_error_from_errno("asprintf");
8171 
8172 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8173 		    0, 0);
8174 		if (err) {
8175 			free(line);
8176 			return err;
8177 		}
8178 		if (n == s->selected) {
8179 			if (view->focussed)
8180 				wstandout(view->window);
8181 			s->selected_entry = re;
8182 		}
8183 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8184 		if (tc)
8185 			wattr_on(view->window,
8186 			    COLOR_PAIR(tc->colorpair), NULL);
8187 		waddwstr(view->window, wline);
8188 		if (tc)
8189 			wattr_off(view->window,
8190 			    COLOR_PAIR(tc->colorpair), NULL);
8191 		if (width < view->ncols - 1)
8192 			waddch(view->window, '\n');
8193 		if (n == s->selected && view->focussed)
8194 			wstandend(view->window);
8195 		free(line);
8196 		free(wline);
8197 		wline = NULL;
8198 		n++;
8199 		s->ndisplayed++;
8200 		s->last_displayed_entry = re;
8201 
8202 		limit--;
8203 		re = TAILQ_NEXT(re, entry);
8204 	}
8205 
8206 	view_border(view);
8207 	return err;
8208 }
8209 
8210 static const struct got_error *
8211 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8212     struct tog_reflist_entry *re, struct got_repository *repo)
8213 {
8214 	const struct got_error *err = NULL;
8215 	struct got_object_id *commit_id = NULL;
8216 	struct tog_view *tree_view;
8217 
8218 	*new_view = NULL;
8219 
8220 	err = resolve_reflist_entry(&commit_id, re, repo);
8221 	if (err) {
8222 		if (err->code != GOT_ERR_OBJ_TYPE)
8223 			return err;
8224 		else
8225 			return NULL;
8226 	}
8227 
8228 
8229 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8230 	if (tree_view == NULL) {
8231 		err = got_error_from_errno("view_open");
8232 		goto done;
8233 	}
8234 
8235 	err = open_tree_view(tree_view, commit_id,
8236 	    got_ref_get_name(re->ref), repo);
8237 	if (err)
8238 		goto done;
8239 
8240 	*new_view = tree_view;
8241 done:
8242 	free(commit_id);
8243 	return err;
8244 }
8245 
8246 static const struct got_error *
8247 ref_goto_line(struct tog_view *view, int nlines)
8248 {
8249 	const struct got_error		*err = NULL;
8250 	struct tog_ref_view_state	*s = &view->state.ref;
8251 	int				 g, idx = s->selected_entry->idx;
8252 
8253 	g = view->gline;
8254 	view->gline = 0;
8255 
8256 	if (g == 0)
8257 		g = 1;
8258 	else if (g > s->nrefs)
8259 		g = s->nrefs;
8260 
8261 	if (g >= s->first_displayed_entry->idx + 1 &&
8262 	    g <= s->last_displayed_entry->idx + 1 &&
8263 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8264 		s->selected = g - s->first_displayed_entry->idx - 1;
8265 		return NULL;
8266 	}
8267 
8268 	if (idx + 1 < g) {
8269 		err = ref_scroll_down(view, g - idx - 1);
8270 		if (err)
8271 			return err;
8272 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8273 		    s->first_displayed_entry->idx + s->selected < g &&
8274 		    s->selected < s->ndisplayed - 1)
8275 			s->selected = g - s->first_displayed_entry->idx - 1;
8276 	} else if (idx + 1 > g)
8277 		ref_scroll_up(s, idx - g + 1);
8278 
8279 	if (g < nlines && s->first_displayed_entry->idx == 0)
8280 		s->selected = g - 1;
8281 
8282 	return NULL;
8283 
8284 }
8285 
8286 static const struct got_error *
8287 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8288 {
8289 	const struct got_error *err = NULL;
8290 	struct tog_ref_view_state *s = &view->state.ref;
8291 	struct tog_reflist_entry *re;
8292 	int n, nscroll = view->nlines - 1;
8293 
8294 	if (view->gline)
8295 		return ref_goto_line(view, nscroll);
8296 
8297 	switch (ch) {
8298 	case 'i':
8299 		s->show_ids = !s->show_ids;
8300 		view->count = 0;
8301 		break;
8302 	case 'm':
8303 		s->show_date = !s->show_date;
8304 		view->count = 0;
8305 		break;
8306 	case 'o':
8307 		s->sort_by_date = !s->sort_by_date;
8308 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8309 		view->count = 0;
8310 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8311 		    got_ref_cmp_by_commit_timestamp_descending :
8312 		    tog_ref_cmp_by_name, s->repo);
8313 		if (err)
8314 			break;
8315 		got_reflist_object_id_map_free(tog_refs_idmap);
8316 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8317 		    &tog_refs, s->repo);
8318 		if (err)
8319 			break;
8320 		ref_view_free_refs(s);
8321 		err = ref_view_load_refs(s);
8322 		break;
8323 	case KEY_ENTER:
8324 	case '\r':
8325 		view->count = 0;
8326 		if (!s->selected_entry)
8327 			break;
8328 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8329 		break;
8330 	case 'T':
8331 		view->count = 0;
8332 		if (!s->selected_entry)
8333 			break;
8334 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8335 		break;
8336 	case 'g':
8337 	case '=':
8338 	case KEY_HOME:
8339 		s->selected = 0;
8340 		view->count = 0;
8341 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8342 		break;
8343 	case 'G':
8344 	case '*':
8345 	case KEY_END: {
8346 		int eos = view->nlines - 1;
8347 
8348 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8349 			--eos;  /* border */
8350 		s->selected = 0;
8351 		view->count = 0;
8352 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8353 		for (n = 0; n < eos; n++) {
8354 			if (re == NULL)
8355 				break;
8356 			s->first_displayed_entry = re;
8357 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8358 		}
8359 		if (n > 0)
8360 			s->selected = n - 1;
8361 		break;
8362 	}
8363 	case 'k':
8364 	case KEY_UP:
8365 	case CTRL('p'):
8366 		if (s->selected > 0) {
8367 			s->selected--;
8368 			break;
8369 		}
8370 		ref_scroll_up(s, 1);
8371 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8372 			view->count = 0;
8373 		break;
8374 	case CTRL('u'):
8375 	case 'u':
8376 		nscroll /= 2;
8377 		/* FALL THROUGH */
8378 	case KEY_PPAGE:
8379 	case CTRL('b'):
8380 	case 'b':
8381 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8382 			s->selected -= MIN(nscroll, s->selected);
8383 		ref_scroll_up(s, MAX(0, nscroll));
8384 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8385 			view->count = 0;
8386 		break;
8387 	case 'j':
8388 	case KEY_DOWN:
8389 	case CTRL('n'):
8390 		if (s->selected < s->ndisplayed - 1) {
8391 			s->selected++;
8392 			break;
8393 		}
8394 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8395 			/* can't scroll any further */
8396 			view->count = 0;
8397 			break;
8398 		}
8399 		ref_scroll_down(view, 1);
8400 		break;
8401 	case CTRL('d'):
8402 	case 'd':
8403 		nscroll /= 2;
8404 		/* FALL THROUGH */
8405 	case KEY_NPAGE:
8406 	case CTRL('f'):
8407 	case 'f':
8408 	case ' ':
8409 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8410 			/* can't scroll any further; move cursor down */
8411 			if (s->selected < s->ndisplayed - 1)
8412 				s->selected += MIN(nscroll,
8413 				    s->ndisplayed - s->selected - 1);
8414 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8415 				s->selected += s->ndisplayed - s->selected - 1;
8416 			view->count = 0;
8417 			break;
8418 		}
8419 		ref_scroll_down(view, nscroll);
8420 		break;
8421 	case CTRL('l'):
8422 		view->count = 0;
8423 		tog_free_refs();
8424 		err = tog_load_refs(s->repo, s->sort_by_date);
8425 		if (err)
8426 			break;
8427 		ref_view_free_refs(s);
8428 		err = ref_view_load_refs(s);
8429 		break;
8430 	case KEY_RESIZE:
8431 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8432 			s->selected = view->nlines - 2;
8433 		break;
8434 	default:
8435 		view->count = 0;
8436 		break;
8437 	}
8438 
8439 	return err;
8440 }
8441 
8442 __dead static void
8443 usage_ref(void)
8444 {
8445 	endwin();
8446 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8447 	    getprogname());
8448 	exit(1);
8449 }
8450 
8451 static const struct got_error *
8452 cmd_ref(int argc, char *argv[])
8453 {
8454 	const struct got_error *error;
8455 	struct got_repository *repo = NULL;
8456 	struct got_worktree *worktree = NULL;
8457 	char *cwd = NULL, *repo_path = NULL;
8458 	int ch;
8459 	struct tog_view *view;
8460 	int *pack_fds = NULL;
8461 
8462 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8463 		switch (ch) {
8464 		case 'r':
8465 			repo_path = realpath(optarg, NULL);
8466 			if (repo_path == NULL)
8467 				return got_error_from_errno2("realpath",
8468 				    optarg);
8469 			break;
8470 		default:
8471 			usage_ref();
8472 			/* NOTREACHED */
8473 		}
8474 	}
8475 
8476 	argc -= optind;
8477 	argv += optind;
8478 
8479 	if (argc > 1)
8480 		usage_ref();
8481 
8482 	error = got_repo_pack_fds_open(&pack_fds);
8483 	if (error != NULL)
8484 		goto done;
8485 
8486 	if (repo_path == NULL) {
8487 		cwd = getcwd(NULL, 0);
8488 		if (cwd == NULL)
8489 			return got_error_from_errno("getcwd");
8490 		error = got_worktree_open(&worktree, cwd);
8491 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8492 			goto done;
8493 		if (worktree)
8494 			repo_path =
8495 			    strdup(got_worktree_get_repo_path(worktree));
8496 		else
8497 			repo_path = strdup(cwd);
8498 		if (repo_path == NULL) {
8499 			error = got_error_from_errno("strdup");
8500 			goto done;
8501 		}
8502 	}
8503 
8504 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8505 	if (error != NULL)
8506 		goto done;
8507 
8508 	init_curses();
8509 
8510 	error = apply_unveil(got_repo_get_path(repo), NULL);
8511 	if (error)
8512 		goto done;
8513 
8514 	error = tog_load_refs(repo, 0);
8515 	if (error)
8516 		goto done;
8517 
8518 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8519 	if (view == NULL) {
8520 		error = got_error_from_errno("view_open");
8521 		goto done;
8522 	}
8523 
8524 	error = open_ref_view(view, repo);
8525 	if (error)
8526 		goto done;
8527 
8528 	if (worktree) {
8529 		/* Release work tree lock. */
8530 		got_worktree_close(worktree);
8531 		worktree = NULL;
8532 	}
8533 	error = view_loop(view);
8534 done:
8535 	free(repo_path);
8536 	free(cwd);
8537 	if (repo) {
8538 		const struct got_error *close_err = got_repo_close(repo);
8539 		if (close_err)
8540 			error = close_err;
8541 	}
8542 	if (pack_fds) {
8543 		const struct got_error *pack_err =
8544 		    got_repo_pack_fds_close(pack_fds);
8545 		if (error == NULL)
8546 			error = pack_err;
8547 	}
8548 	tog_free_refs();
8549 	return error;
8550 }
8551 
8552 static const struct got_error*
8553 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8554     const char *str)
8555 {
8556 	size_t len;
8557 
8558 	if (win == NULL)
8559 		win = stdscr;
8560 
8561 	len = strlen(str);
8562 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8563 
8564 	if (focus)
8565 		wstandout(win);
8566 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8567 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8568 	if (focus)
8569 		wstandend(win);
8570 
8571 	return NULL;
8572 }
8573 
8574 static const struct got_error *
8575 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8576 {
8577 	off_t *p;
8578 
8579 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8580 	if (p == NULL) {
8581 		free(*line_offsets);
8582 		*line_offsets = NULL;
8583 		return got_error_from_errno("reallocarray");
8584 	}
8585 
8586 	*line_offsets = p;
8587 	(*line_offsets)[*nlines] = off;
8588 	++(*nlines);
8589 	return NULL;
8590 }
8591 
8592 static const struct got_error *
8593 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8594 {
8595 	*ret = 0;
8596 
8597 	for (;n > 0; --n, ++km) {
8598 		char	*t0, *t, *k;
8599 		size_t	 len = 1;
8600 
8601 		if (km->keys == NULL)
8602 			continue;
8603 
8604 		t = t0 = strdup(km->keys);
8605 		if (t0 == NULL)
8606 			return got_error_from_errno("strdup");
8607 
8608 		len += strlen(t);
8609 		while ((k = strsep(&t, " ")) != NULL)
8610 			len += strlen(k) > 1 ? 2 : 0;
8611 		free(t0);
8612 		*ret = MAX(*ret, len);
8613 	}
8614 
8615 	return NULL;
8616 }
8617 
8618 /*
8619  * Write keymap section headers, keys, and key info in km to f.
8620  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8621  * wrap control and symbolic keys in guillemets, else use <>.
8622  */
8623 static const struct got_error *
8624 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8625 {
8626 	int n, len = width;
8627 
8628 	if (km->keys) {
8629 		static const char *u8_glyph[] = {
8630 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8631 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8632 		};
8633 		char	*t0, *t, *k;
8634 		int	 cs, s, first = 1;
8635 
8636 		cs = got_locale_is_utf8();
8637 
8638 		t = t0 = strdup(km->keys);
8639 		if (t0 == NULL)
8640 			return got_error_from_errno("strdup");
8641 
8642 		len = strlen(km->keys);
8643 		while ((k = strsep(&t, " ")) != NULL) {
8644 			s = strlen(k) > 1;  /* control or symbolic key */
8645 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8646 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8647 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8648 			if (n < 0) {
8649 				free(t0);
8650 				return got_error_from_errno("fprintf");
8651 			}
8652 			first = 0;
8653 			len += s ? 2 : 0;
8654 			*off += n;
8655 		}
8656 		free(t0);
8657 	}
8658 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8659 	if (n < 0)
8660 		return got_error_from_errno("fprintf");
8661 	*off += n;
8662 
8663 	return NULL;
8664 }
8665 
8666 static const struct got_error *
8667 format_help(struct tog_help_view_state *s)
8668 {
8669 	const struct got_error		*err = NULL;
8670 	off_t				 off = 0;
8671 	int				 i, max, n, show = s->all;
8672 	static const struct tog_key_map	 km[] = {
8673 #define KEYMAP_(info, type)	{ NULL, (info), type }
8674 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8675 		GENERATE_HELP
8676 #undef KEYMAP_
8677 #undef KEY_
8678 	};
8679 
8680 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8681 	if (err)
8682 		return err;
8683 
8684 	n = nitems(km);
8685 	err = max_key_str(&max, km, n);
8686 	if (err)
8687 		return err;
8688 
8689 	for (i = 0; i < n; ++i) {
8690 		if (km[i].keys == NULL) {
8691 			show = s->all;
8692 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8693 			    km[i].type == s->type || s->all)
8694 				show = 1;
8695 		}
8696 		if (show) {
8697 			err = format_help_line(&off, s->f, &km[i], max);
8698 			if (err)
8699 				return err;
8700 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8701 			if (err)
8702 				return err;
8703 		}
8704 	}
8705 	fputc('\n', s->f);
8706 	++off;
8707 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8708 	return err;
8709 }
8710 
8711 static const struct got_error *
8712 create_help(struct tog_help_view_state *s)
8713 {
8714 	FILE			*f;
8715 	const struct got_error	*err;
8716 
8717 	free(s->line_offsets);
8718 	s->line_offsets = NULL;
8719 	s->nlines = 0;
8720 
8721 	f = got_opentemp();
8722 	if (f == NULL)
8723 		return got_error_from_errno("got_opentemp");
8724 	s->f = f;
8725 
8726 	err = format_help(s);
8727 	if (err)
8728 		return err;
8729 
8730 	if (s->f && fflush(s->f) != 0)
8731 		return got_error_from_errno("fflush");
8732 
8733 	return NULL;
8734 }
8735 
8736 static const struct got_error *
8737 search_start_help_view(struct tog_view *view)
8738 {
8739 	view->state.help.matched_line = 0;
8740 	return NULL;
8741 }
8742 
8743 static void
8744 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8745     size_t *nlines, int **first, int **last, int **match, int **selected)
8746 {
8747 	struct tog_help_view_state *s = &view->state.help;
8748 
8749 	*f = s->f;
8750 	*nlines = s->nlines;
8751 	*line_offsets = s->line_offsets;
8752 	*match = &s->matched_line;
8753 	*first = &s->first_displayed_line;
8754 	*last = &s->last_displayed_line;
8755 	*selected = &s->selected_line;
8756 }
8757 
8758 static const struct got_error *
8759 show_help_view(struct tog_view *view)
8760 {
8761 	struct tog_help_view_state	*s = &view->state.help;
8762 	const struct got_error		*err;
8763 	regmatch_t			*regmatch = &view->regmatch;
8764 	wchar_t				*wline;
8765 	char				*line;
8766 	ssize_t				 linelen;
8767 	size_t				 linesz = 0;
8768 	int				 width, nprinted = 0, rc = 0;
8769 	int				 eos = view->nlines;
8770 
8771 	if (view_is_hsplit_top(view))
8772 		--eos;  /* account for border */
8773 
8774 	s->lineno = 0;
8775 	rewind(s->f);
8776 	werase(view->window);
8777 
8778 	if (view->gline > s->nlines - 1)
8779 		view->gline = s->nlines - 1;
8780 
8781 	err = win_draw_center(view->window, 0, 0, view->ncols,
8782 	    view_needs_focus_indication(view),
8783 	    "tog help (press q to return to tog)");
8784 	if (err)
8785 		return err;
8786 	if (eos <= 1)
8787 		return NULL;
8788 	waddstr(view->window, "\n\n");
8789 	eos -= 2;
8790 
8791 	s->eof = 0;
8792 	view->maxx = 0;
8793 	line = NULL;
8794 	while (eos > 0 && nprinted < eos) {
8795 		attr_t attr = 0;
8796 
8797 		linelen = getline(&line, &linesz, s->f);
8798 		if (linelen == -1) {
8799 			if (!feof(s->f)) {
8800 				free(line);
8801 				return got_ferror(s->f, GOT_ERR_IO);
8802 			}
8803 			s->eof = 1;
8804 			break;
8805 		}
8806 		if (++s->lineno < s->first_displayed_line)
8807 			continue;
8808 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8809 			continue;
8810 		if (s->lineno == view->hiline)
8811 			attr = A_STANDOUT;
8812 
8813 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8814 		    view->x ? 1 : 0);
8815 		if (err) {
8816 			free(line);
8817 			return err;
8818 		}
8819 		view->maxx = MAX(view->maxx, width);
8820 		free(wline);
8821 		wline = NULL;
8822 
8823 		if (attr)
8824 			wattron(view->window, attr);
8825 		if (s->first_displayed_line + nprinted == s->matched_line &&
8826 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8827 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8828 			    view->window, view->x, regmatch);
8829 			if (err) {
8830 				free(line);
8831 				return err;
8832 			}
8833 		} else {
8834 			int skip;
8835 
8836 			err = format_line(&wline, &width, &skip, line,
8837 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8838 			if (err) {
8839 				free(line);
8840 				return err;
8841 			}
8842 			rc = waddwstr(view->window, &wline[skip]);
8843 			free(wline);
8844 			wline = NULL;
8845 			if (rc == ERR)
8846 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8847 		}
8848 		if (s->lineno == view->hiline) {
8849 			while (width++ < view->ncols)
8850 				waddch(view->window, ' ');
8851 		} else {
8852 			if (width <= view->ncols)
8853 				waddch(view->window, '\n');
8854 		}
8855 		if (attr)
8856 			wattroff(view->window, attr);
8857 		if (++nprinted == 1)
8858 			s->first_displayed_line = s->lineno;
8859 	}
8860 	free(line);
8861 	if (nprinted > 0)
8862 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8863 	else
8864 		s->last_displayed_line = s->first_displayed_line;
8865 
8866 	view_border(view);
8867 
8868 	if (s->eof) {
8869 		rc = waddnstr(view->window,
8870 		    "See the tog(1) manual page for full documentation",
8871 		    view->ncols - 1);
8872 		if (rc == ERR)
8873 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8874 	} else {
8875 		wmove(view->window, view->nlines - 1, 0);
8876 		wclrtoeol(view->window);
8877 		wstandout(view->window);
8878 		rc = waddnstr(view->window, "scroll down for more...",
8879 		    view->ncols - 1);
8880 		if (rc == ERR)
8881 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8882 		if (getcurx(view->window) < view->ncols - 6) {
8883 			rc = wprintw(view->window, "[%.0f%%]",
8884 			    100.00 * s->last_displayed_line / s->nlines);
8885 			if (rc == ERR)
8886 				return got_error_msg(GOT_ERR_IO, "wprintw");
8887 		}
8888 		wstandend(view->window);
8889 	}
8890 
8891 	return NULL;
8892 }
8893 
8894 static const struct got_error *
8895 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8896 {
8897 	struct tog_help_view_state	*s = &view->state.help;
8898 	const struct got_error		*err = NULL;
8899 	char				*line = NULL;
8900 	ssize_t				 linelen;
8901 	size_t				 linesz = 0;
8902 	int				 eos, nscroll;
8903 
8904 	eos = nscroll = view->nlines;
8905 	if (view_is_hsplit_top(view))
8906 		--eos;  /* border */
8907 
8908 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8909 
8910 	switch (ch) {
8911 	case '0':
8912 		view->x = 0;
8913 		break;
8914 	case '$':
8915 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8916 		view->count = 0;
8917 		break;
8918 	case KEY_RIGHT:
8919 	case 'l':
8920 		if (view->x + view->ncols / 3 < view->maxx)
8921 			view->x += 2;
8922 		else
8923 			view->count = 0;
8924 		break;
8925 	case KEY_LEFT:
8926 	case 'h':
8927 		view->x -= MIN(view->x, 2);
8928 		if (view->x <= 0)
8929 			view->count = 0;
8930 		break;
8931 	case 'g':
8932 	case KEY_HOME:
8933 		s->first_displayed_line = 1;
8934 		view->count = 0;
8935 		break;
8936 	case 'G':
8937 	case KEY_END:
8938 		view->count = 0;
8939 		if (s->eof)
8940 			break;
8941 		s->first_displayed_line = (s->nlines - eos) + 3;
8942 		s->eof = 1;
8943 		break;
8944 	case 'k':
8945 	case KEY_UP:
8946 		if (s->first_displayed_line > 1)
8947 			--s->first_displayed_line;
8948 		else
8949 			view->count = 0;
8950 		break;
8951 	case CTRL('u'):
8952 	case 'u':
8953 		nscroll /= 2;
8954 		/* FALL THROUGH */
8955 	case KEY_PPAGE:
8956 	case CTRL('b'):
8957 	case 'b':
8958 		if (s->first_displayed_line == 1) {
8959 			view->count = 0;
8960 			break;
8961 		}
8962 		while (--nscroll > 0 && s->first_displayed_line > 1)
8963 			s->first_displayed_line--;
8964 		break;
8965 	case 'j':
8966 	case KEY_DOWN:
8967 	case CTRL('n'):
8968 		if (!s->eof)
8969 			++s->first_displayed_line;
8970 		else
8971 			view->count = 0;
8972 		break;
8973 	case CTRL('d'):
8974 	case 'd':
8975 		nscroll /= 2;
8976 		/* FALL THROUGH */
8977 	case KEY_NPAGE:
8978 	case CTRL('f'):
8979 	case 'f':
8980 	case ' ':
8981 		if (s->eof) {
8982 			view->count = 0;
8983 			break;
8984 		}
8985 		while (!s->eof && --nscroll > 0) {
8986 			linelen = getline(&line, &linesz, s->f);
8987 			s->first_displayed_line++;
8988 			if (linelen == -1) {
8989 				if (feof(s->f))
8990 					s->eof = 1;
8991 				else
8992 					err = got_ferror(s->f, GOT_ERR_IO);
8993 				break;
8994 			}
8995 		}
8996 		free(line);
8997 		break;
8998 	default:
8999 		view->count = 0;
9000 		break;
9001 	}
9002 
9003 	return err;
9004 }
9005 
9006 static const struct got_error *
9007 close_help_view(struct tog_view *view)
9008 {
9009 	struct tog_help_view_state *s = &view->state.help;
9010 
9011 	free(s->line_offsets);
9012 	s->line_offsets = NULL;
9013 	if (fclose(s->f) == EOF)
9014 		return got_error_from_errno("fclose");
9015 
9016 	return NULL;
9017 }
9018 
9019 static const struct got_error *
9020 reset_help_view(struct tog_view *view)
9021 {
9022 	struct tog_help_view_state *s = &view->state.help;
9023 
9024 
9025 	if (s->f && fclose(s->f) == EOF)
9026 		return got_error_from_errno("fclose");
9027 
9028 	wclear(view->window);
9029 	view->count = 0;
9030 	view->x = 0;
9031 	s->all = !s->all;
9032 	s->first_displayed_line = 1;
9033 	s->last_displayed_line = view->nlines;
9034 	s->matched_line = 0;
9035 
9036 	return create_help(s);
9037 }
9038 
9039 static const struct got_error *
9040 open_help_view(struct tog_view *view, struct tog_view *parent)
9041 {
9042 	const struct got_error		*err = NULL;
9043 	struct tog_help_view_state	*s = &view->state.help;
9044 
9045 	s->type = (enum tog_keymap_type)parent->type;
9046 	s->first_displayed_line = 1;
9047 	s->last_displayed_line = view->nlines;
9048 	s->selected_line = 1;
9049 
9050 	view->show = show_help_view;
9051 	view->input = input_help_view;
9052 	view->reset = reset_help_view;
9053 	view->close = close_help_view;
9054 	view->search_start = search_start_help_view;
9055 	view->search_setup = search_setup_help_view;
9056 	view->search_next = search_next_view_match;
9057 
9058 	err = create_help(s);
9059 	return err;
9060 }
9061 
9062 static const struct got_error *
9063 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9064     enum tog_view_type request, int y, int x)
9065 {
9066 	const struct got_error *err = NULL;
9067 
9068 	*new_view = NULL;
9069 
9070 	switch (request) {
9071 	case TOG_VIEW_DIFF:
9072 		if (view->type == TOG_VIEW_LOG) {
9073 			struct tog_log_view_state *s = &view->state.log;
9074 
9075 			err = open_diff_view_for_commit(new_view, y, x,
9076 			    s->selected_entry->commit, s->selected_entry->id,
9077 			    view, s->repo);
9078 		} else
9079 			return got_error_msg(GOT_ERR_NOT_IMPL,
9080 			    "parent/child view pair not supported");
9081 		break;
9082 	case TOG_VIEW_BLAME:
9083 		if (view->type == TOG_VIEW_TREE) {
9084 			struct tog_tree_view_state *s = &view->state.tree;
9085 
9086 			err = blame_tree_entry(new_view, y, x,
9087 			    s->selected_entry, &s->parents, s->commit_id,
9088 			    s->repo);
9089 		} else
9090 			return got_error_msg(GOT_ERR_NOT_IMPL,
9091 			    "parent/child view pair not supported");
9092 		break;
9093 	case TOG_VIEW_LOG:
9094 		if (view->type == TOG_VIEW_BLAME)
9095 			err = log_annotated_line(new_view, y, x,
9096 			    view->state.blame.repo, view->state.blame.id_to_log);
9097 		else if (view->type == TOG_VIEW_TREE)
9098 			err = log_selected_tree_entry(new_view, y, x,
9099 			    &view->state.tree);
9100 		else if (view->type == TOG_VIEW_REF)
9101 			err = log_ref_entry(new_view, y, x,
9102 			    view->state.ref.selected_entry,
9103 			    view->state.ref.repo);
9104 		else
9105 			return got_error_msg(GOT_ERR_NOT_IMPL,
9106 			    "parent/child view pair not supported");
9107 		break;
9108 	case TOG_VIEW_TREE:
9109 		if (view->type == TOG_VIEW_LOG)
9110 			err = browse_commit_tree(new_view, y, x,
9111 			    view->state.log.selected_entry,
9112 			    view->state.log.in_repo_path,
9113 			    view->state.log.head_ref_name,
9114 			    view->state.log.repo);
9115 		else if (view->type == TOG_VIEW_REF)
9116 			err = browse_ref_tree(new_view, y, x,
9117 			    view->state.ref.selected_entry,
9118 			    view->state.ref.repo);
9119 		else
9120 			return got_error_msg(GOT_ERR_NOT_IMPL,
9121 			    "parent/child view pair not supported");
9122 		break;
9123 	case TOG_VIEW_REF:
9124 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9125 		if (*new_view == NULL)
9126 			return got_error_from_errno("view_open");
9127 		if (view->type == TOG_VIEW_LOG)
9128 			err = open_ref_view(*new_view, view->state.log.repo);
9129 		else if (view->type == TOG_VIEW_TREE)
9130 			err = open_ref_view(*new_view, view->state.tree.repo);
9131 		else
9132 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9133 			    "parent/child view pair not supported");
9134 		if (err)
9135 			view_close(*new_view);
9136 		break;
9137 	case TOG_VIEW_HELP:
9138 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9139 		if (*new_view == NULL)
9140 			return got_error_from_errno("view_open");
9141 		err = open_help_view(*new_view, view);
9142 		if (err)
9143 			view_close(*new_view);
9144 		break;
9145 	default:
9146 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9147 	}
9148 
9149 	return err;
9150 }
9151 
9152 /*
9153  * If view was scrolled down to move the selected line into view when opening a
9154  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9155  */
9156 static void
9157 offset_selection_up(struct tog_view *view)
9158 {
9159 	switch (view->type) {
9160 	case TOG_VIEW_BLAME: {
9161 		struct tog_blame_view_state *s = &view->state.blame;
9162 		if (s->first_displayed_line == 1) {
9163 			s->selected_line = MAX(s->selected_line - view->offset,
9164 			    1);
9165 			break;
9166 		}
9167 		if (s->first_displayed_line > view->offset)
9168 			s->first_displayed_line -= view->offset;
9169 		else
9170 			s->first_displayed_line = 1;
9171 		s->selected_line += view->offset;
9172 		break;
9173 	}
9174 	case TOG_VIEW_LOG:
9175 		log_scroll_up(&view->state.log, view->offset);
9176 		view->state.log.selected += view->offset;
9177 		break;
9178 	case TOG_VIEW_REF:
9179 		ref_scroll_up(&view->state.ref, view->offset);
9180 		view->state.ref.selected += view->offset;
9181 		break;
9182 	case TOG_VIEW_TREE:
9183 		tree_scroll_up(&view->state.tree, view->offset);
9184 		view->state.tree.selected += view->offset;
9185 		break;
9186 	default:
9187 		break;
9188 	}
9189 
9190 	view->offset = 0;
9191 }
9192 
9193 /*
9194  * If the selected line is in the section of screen covered by the bottom split,
9195  * scroll down offset lines to move it into view and index its new position.
9196  */
9197 static const struct got_error *
9198 offset_selection_down(struct tog_view *view)
9199 {
9200 	const struct got_error	*err = NULL;
9201 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9202 	int			*selected = NULL;
9203 	int			 header, offset;
9204 
9205 	switch (view->type) {
9206 	case TOG_VIEW_BLAME: {
9207 		struct tog_blame_view_state *s = &view->state.blame;
9208 		header = 3;
9209 		scrolld = NULL;
9210 		if (s->selected_line > view->nlines - header) {
9211 			offset = abs(view->nlines - s->selected_line - header);
9212 			s->first_displayed_line += offset;
9213 			s->selected_line -= offset;
9214 			view->offset = offset;
9215 		}
9216 		break;
9217 	}
9218 	case TOG_VIEW_LOG: {
9219 		struct tog_log_view_state *s = &view->state.log;
9220 		scrolld = &log_scroll_down;
9221 		header = view_is_parent_view(view) ? 3 : 2;
9222 		selected = &s->selected;
9223 		break;
9224 	}
9225 	case TOG_VIEW_REF: {
9226 		struct tog_ref_view_state *s = &view->state.ref;
9227 		scrolld = &ref_scroll_down;
9228 		header = 3;
9229 		selected = &s->selected;
9230 		break;
9231 	}
9232 	case TOG_VIEW_TREE: {
9233 		struct tog_tree_view_state *s = &view->state.tree;
9234 		scrolld = &tree_scroll_down;
9235 		header = 5;
9236 		selected = &s->selected;
9237 		break;
9238 	}
9239 	default:
9240 		selected = NULL;
9241 		scrolld = NULL;
9242 		header = 0;
9243 		break;
9244 	}
9245 
9246 	if (selected && *selected > view->nlines - header) {
9247 		offset = abs(view->nlines - *selected - header);
9248 		view->offset = offset;
9249 		if (scrolld && offset) {
9250 			err = scrolld(view, offset);
9251 			*selected -= offset;
9252 		}
9253 	}
9254 
9255 	return err;
9256 }
9257 
9258 static void
9259 list_commands(FILE *fp)
9260 {
9261 	size_t i;
9262 
9263 	fprintf(fp, "commands:");
9264 	for (i = 0; i < nitems(tog_commands); i++) {
9265 		const struct tog_cmd *cmd = &tog_commands[i];
9266 		fprintf(fp, " %s", cmd->name);
9267 	}
9268 	fputc('\n', fp);
9269 }
9270 
9271 __dead static void
9272 usage(int hflag, int status)
9273 {
9274 	FILE *fp = (status == 0) ? stdout : stderr;
9275 
9276 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9277 	    getprogname());
9278 	if (hflag) {
9279 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9280 		list_commands(fp);
9281 	}
9282 	exit(status);
9283 }
9284 
9285 static char **
9286 make_argv(int argc, ...)
9287 {
9288 	va_list ap;
9289 	char **argv;
9290 	int i;
9291 
9292 	va_start(ap, argc);
9293 
9294 	argv = calloc(argc, sizeof(char *));
9295 	if (argv == NULL)
9296 		err(1, "calloc");
9297 	for (i = 0; i < argc; i++) {
9298 		argv[i] = strdup(va_arg(ap, char *));
9299 		if (argv[i] == NULL)
9300 			err(1, "strdup");
9301 	}
9302 
9303 	va_end(ap);
9304 	return argv;
9305 }
9306 
9307 /*
9308  * Try to convert 'tog path' into a 'tog log path' command.
9309  * The user could simply have mistyped the command rather than knowingly
9310  * provided a path. So check whether argv[0] can in fact be resolved
9311  * to a path in the HEAD commit and print a special error if not.
9312  * This hack is for mpi@ <3
9313  */
9314 static const struct got_error *
9315 tog_log_with_path(int argc, char *argv[])
9316 {
9317 	const struct got_error *error = NULL, *close_err;
9318 	const struct tog_cmd *cmd = NULL;
9319 	struct got_repository *repo = NULL;
9320 	struct got_worktree *worktree = NULL;
9321 	struct got_object_id *commit_id = NULL, *id = NULL;
9322 	struct got_commit_object *commit = NULL;
9323 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9324 	char *commit_id_str = NULL, **cmd_argv = NULL;
9325 	int *pack_fds = NULL;
9326 
9327 	cwd = getcwd(NULL, 0);
9328 	if (cwd == NULL)
9329 		return got_error_from_errno("getcwd");
9330 
9331 	error = got_repo_pack_fds_open(&pack_fds);
9332 	if (error != NULL)
9333 		goto done;
9334 
9335 	error = got_worktree_open(&worktree, cwd);
9336 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9337 		goto done;
9338 
9339 	if (worktree)
9340 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9341 	else
9342 		repo_path = strdup(cwd);
9343 	if (repo_path == NULL) {
9344 		error = got_error_from_errno("strdup");
9345 		goto done;
9346 	}
9347 
9348 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9349 	if (error != NULL)
9350 		goto done;
9351 
9352 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9353 	    repo, worktree);
9354 	if (error)
9355 		goto done;
9356 
9357 	error = tog_load_refs(repo, 0);
9358 	if (error)
9359 		goto done;
9360 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9361 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9362 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9363 	if (error)
9364 		goto done;
9365 
9366 	if (worktree) {
9367 		got_worktree_close(worktree);
9368 		worktree = NULL;
9369 	}
9370 
9371 	error = got_object_open_as_commit(&commit, repo, commit_id);
9372 	if (error)
9373 		goto done;
9374 
9375 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9376 	if (error) {
9377 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9378 			goto done;
9379 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9380 		    getprogname(), argv[0]);
9381 		usage(1, 1);
9382 		/* not reached */
9383 	}
9384 
9385 	error = got_object_id_str(&commit_id_str, commit_id);
9386 	if (error)
9387 		goto done;
9388 
9389 	cmd = &tog_commands[0]; /* log */
9390 	argc = 4;
9391 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9392 	error = cmd->cmd_main(argc, cmd_argv);
9393 done:
9394 	if (repo) {
9395 		close_err = got_repo_close(repo);
9396 		if (error == NULL)
9397 			error = close_err;
9398 	}
9399 	if (commit)
9400 		got_object_commit_close(commit);
9401 	if (worktree)
9402 		got_worktree_close(worktree);
9403 	if (pack_fds) {
9404 		const struct got_error *pack_err =
9405 		    got_repo_pack_fds_close(pack_fds);
9406 		if (error == NULL)
9407 			error = pack_err;
9408 	}
9409 	free(id);
9410 	free(commit_id_str);
9411 	free(commit_id);
9412 	free(cwd);
9413 	free(repo_path);
9414 	free(in_repo_path);
9415 	if (cmd_argv) {
9416 		int i;
9417 		for (i = 0; i < argc; i++)
9418 			free(cmd_argv[i]);
9419 		free(cmd_argv);
9420 	}
9421 	tog_free_refs();
9422 	return error;
9423 }
9424 
9425 int
9426 main(int argc, char *argv[])
9427 {
9428 	const struct got_error *error = NULL;
9429 	const struct tog_cmd *cmd = NULL;
9430 	int ch, hflag = 0, Vflag = 0;
9431 	char **cmd_argv = NULL;
9432 	static const struct option longopts[] = {
9433 	    { "version", no_argument, NULL, 'V' },
9434 	    { NULL, 0, NULL, 0}
9435 	};
9436 	char *diff_algo_str = NULL;
9437 
9438 	if (!isatty(STDIN_FILENO))
9439 		errx(1, "standard input is not a tty");
9440 
9441 	setlocale(LC_CTYPE, "");
9442 
9443 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9444 		switch (ch) {
9445 		case 'h':
9446 			hflag = 1;
9447 			break;
9448 		case 'V':
9449 			Vflag = 1;
9450 			break;
9451 		default:
9452 			usage(hflag, 1);
9453 			/* NOTREACHED */
9454 		}
9455 	}
9456 
9457 	argc -= optind;
9458 	argv += optind;
9459 	optind = 1;
9460 	optreset = 1;
9461 
9462 	if (Vflag) {
9463 		got_version_print_str();
9464 		return 0;
9465 	}
9466 
9467 #ifndef PROFILE
9468 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9469 	    NULL) == -1)
9470 		err(1, "pledge");
9471 #endif
9472 
9473 	if (argc == 0) {
9474 		if (hflag)
9475 			usage(hflag, 0);
9476 		/* Build an argument vector which runs a default command. */
9477 		cmd = &tog_commands[0];
9478 		argc = 1;
9479 		cmd_argv = make_argv(argc, cmd->name);
9480 	} else {
9481 		size_t i;
9482 
9483 		/* Did the user specify a command? */
9484 		for (i = 0; i < nitems(tog_commands); i++) {
9485 			if (strncmp(tog_commands[i].name, argv[0],
9486 			    strlen(argv[0])) == 0) {
9487 				cmd = &tog_commands[i];
9488 				break;
9489 			}
9490 		}
9491 	}
9492 
9493 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9494 	if (diff_algo_str) {
9495 		if (strcasecmp(diff_algo_str, "patience") == 0)
9496 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9497 		if (strcasecmp(diff_algo_str, "myers") == 0)
9498 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9499 	}
9500 
9501 	if (cmd == NULL) {
9502 		if (argc != 1)
9503 			usage(0, 1);
9504 		/* No command specified; try log with a path */
9505 		error = tog_log_with_path(argc, argv);
9506 	} else {
9507 		if (hflag)
9508 			cmd->cmd_usage();
9509 		else
9510 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9511 	}
9512 
9513 	endwin();
9514 	if (cmd_argv) {
9515 		int i;
9516 		for (i = 0; i < argc; i++)
9517 			free(cmd_argv[i]);
9518 		free(cmd_argv);
9519 	}
9520 
9521 	if (error && error->code != GOT_ERR_CANCELLED &&
9522 	    error->code != GOT_ERR_EOF &&
9523 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9524 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9525 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9526 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9527 	return 0;
9528 }