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, int fast_refresh)
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 (!fast_refresh)
1330 		halfdelay(10);
1331 	if (ret == ERR)
1332 		return NULL;
1333 
1334 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1335 		err = view->search_start(view);
1336 		if (err) {
1337 			regfree(&view->regex);
1338 			return err;
1339 		}
1340 		view->search_started = 1;
1341 		view->searching = TOG_SEARCH_FORWARD;
1342 		view->search_next_done = 0;
1343 		view->search_next(view);
1344 	}
1345 
1346 	return NULL;
1347 }
1348 
1349 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1350 static const struct got_error *
1351 switch_split(struct tog_view *view)
1352 {
1353 	const struct got_error	*err = NULL;
1354 	struct tog_view		*v = NULL;
1355 
1356 	if (view->parent)
1357 		v = view->parent;
1358 	else
1359 		v = view;
1360 
1361 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1362 		v->mode = TOG_VIEW_SPLIT_VERT;
1363 	else
1364 		v->mode = TOG_VIEW_SPLIT_HRZN;
1365 
1366 	if (!v->child)
1367 		return NULL;
1368 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1369 		v->mode = TOG_VIEW_SPLIT_NONE;
1370 
1371 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1372 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1373 		v->child->begin_y = v->child->resized_y;
1374 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1375 		v->child->begin_x = v->child->resized_x;
1376 
1377 
1378 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1379 		v->ncols = COLS;
1380 		v->child->ncols = COLS;
1381 		v->child->nscrolled = LINES - v->child->nlines;
1382 
1383 		err = view_init_hsplit(v, v->child->begin_y);
1384 		if (err)
1385 			return err;
1386 	}
1387 	v->child->mode = v->mode;
1388 	v->child->nlines = v->lines - v->child->begin_y;
1389 	v->focus_child = 1;
1390 
1391 	err = view_fullscreen(v);
1392 	if (err)
1393 		return err;
1394 	err = view_splitscreen(v->child);
1395 	if (err)
1396 		return err;
1397 
1398 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1399 		v->mode = TOG_VIEW_SPLIT_VERT;
1400 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1401 		err = offset_selection_down(v);
1402 		if (err)
1403 			return err;
1404 		err = offset_selection_down(v->child);
1405 		if (err)
1406 			return err;
1407 	} else {
1408 		offset_selection_up(v);
1409 		offset_selection_up(v->child);
1410 	}
1411 	if (v->resize)
1412 		err = v->resize(v, 0);
1413 	else if (v->child->resize)
1414 		err = v->child->resize(v->child, 0);
1415 
1416 	return err;
1417 }
1418 
1419 /*
1420  * Compute view->count from numeric input. Assign total to view->count and
1421  * return first non-numeric key entered.
1422  */
1423 static int
1424 get_compound_key(struct tog_view *view, int c)
1425 {
1426 	struct tog_view	*v = view;
1427 	int		 x, n = 0;
1428 
1429 	if (view_is_hsplit_top(view))
1430 		v = view->child;
1431 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1432 		v = view->parent;
1433 
1434 	view->count = 0;
1435 	cbreak();  /* block for input */
1436 	nodelay(view->window, FALSE);
1437 	wmove(v->window, v->nlines - 1, 0);
1438 	wclrtoeol(v->window);
1439 	waddch(v->window, ':');
1440 
1441 	do {
1442 		x = getcurx(v->window);
1443 		if (x != ERR && x < view->ncols) {
1444 			waddch(v->window, c);
1445 			wrefresh(v->window);
1446 		}
1447 
1448 		/*
1449 		 * Don't overflow. Max valid request should be the greatest
1450 		 * between the longest and total lines; cap at 10 million.
1451 		 */
1452 		if (n >= 9999999)
1453 			n = 9999999;
1454 		else
1455 			n = n * 10 + (c - '0');
1456 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1457 
1458 	if (c == 'G' || c == 'g') {	/* nG key map */
1459 		view->gline = view->hiline = n;
1460 		n = 0;
1461 		c = 0;
1462 	}
1463 
1464 	/* Massage excessive or inapplicable values at the input handler. */
1465 	view->count = n;
1466 
1467 	return c;
1468 }
1469 
1470 static void
1471 action_report(struct tog_view *view)
1472 {
1473 	struct tog_view *v = view;
1474 
1475 	if (view_is_hsplit_top(view))
1476 		v = view->child;
1477 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1478 		v = view->parent;
1479 
1480 	wmove(v->window, v->nlines - 1, 0);
1481 	wclrtoeol(v->window);
1482 	wprintw(v->window, ":%s", view->action);
1483 	wrefresh(v->window);
1484 
1485 	/*
1486 	 * Clear action status report. Only clear in blame view
1487 	 * once annotating is complete, otherwise it's too fast.
1488 	 */
1489 	if (view->type == TOG_VIEW_BLAME) {
1490 		if (view->state.blame.blame_complete)
1491 			view->action = NULL;
1492 	} else
1493 		view->action = NULL;
1494 }
1495 
1496 static const struct got_error *
1497 view_input(struct tog_view **new, int *done, struct tog_view *view,
1498     struct tog_view_list_head *views, int fast_refresh)
1499 {
1500 	const struct got_error *err = NULL;
1501 	struct tog_view *v;
1502 	int ch, errcode;
1503 
1504 	*new = NULL;
1505 
1506 	if (view->action)
1507 		action_report(view);
1508 
1509 	/* Clear "no matches" indicator. */
1510 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1511 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1512 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1513 		view->count = 0;
1514 	}
1515 
1516 	if (view->searching && !view->search_next_done) {
1517 		errcode = pthread_mutex_unlock(&tog_mutex);
1518 		if (errcode)
1519 			return got_error_set_errno(errcode,
1520 			    "pthread_mutex_unlock");
1521 		sched_yield();
1522 		errcode = pthread_mutex_lock(&tog_mutex);
1523 		if (errcode)
1524 			return got_error_set_errno(errcode,
1525 			    "pthread_mutex_lock");
1526 		view->search_next(view);
1527 		return NULL;
1528 	}
1529 
1530 	/* Allow threads to make progress while we are waiting for input. */
1531 	errcode = pthread_mutex_unlock(&tog_mutex);
1532 	if (errcode)
1533 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1534 	/* If we have an unfinished count, let C-g or backspace abort. */
1535 	if (view->count && --view->count) {
1536 		cbreak();
1537 		nodelay(view->window, TRUE);
1538 		ch = wgetch(view->window);
1539 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1540 			view->count = 0;
1541 		else
1542 			ch = view->ch;
1543 	} else {
1544 		ch = wgetch(view->window);
1545 		if (ch >= '1' && ch  <= '9')
1546 			view->ch = ch = get_compound_key(view, ch);
1547 	}
1548 	if (view->hiline && ch != ERR && ch != 0)
1549 		view->hiline = 0;  /* key pressed, clear line highlight */
1550 	nodelay(view->window, TRUE);
1551 	errcode = pthread_mutex_lock(&tog_mutex);
1552 	if (errcode)
1553 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1554 
1555 	if (tog_sigwinch_received || tog_sigcont_received) {
1556 		tog_resizeterm();
1557 		tog_sigwinch_received = 0;
1558 		tog_sigcont_received = 0;
1559 		TAILQ_FOREACH(v, views, entry) {
1560 			err = view_resize(v);
1561 			if (err)
1562 				return err;
1563 			err = v->input(new, v, KEY_RESIZE);
1564 			if (err)
1565 				return err;
1566 			if (v->child) {
1567 				err = view_resize(v->child);
1568 				if (err)
1569 					return err;
1570 				err = v->child->input(new, v->child,
1571 				    KEY_RESIZE);
1572 				if (err)
1573 					return err;
1574 				if (v->child->resized_x || v->child->resized_y) {
1575 					err = view_resize_split(v, 0);
1576 					if (err)
1577 						return err;
1578 				}
1579 			}
1580 		}
1581 	}
1582 
1583 	switch (ch) {
1584 	case '?':
1585 	case 'H':
1586 	case KEY_F(1):
1587 		if (view->type == TOG_VIEW_HELP)
1588 			err = view->reset(view);
1589 		else
1590 			err = view_request_new(new, view, TOG_VIEW_HELP);
1591 		break;
1592 	case '\t':
1593 		view->count = 0;
1594 		if (view->child) {
1595 			view->focussed = 0;
1596 			view->child->focussed = 1;
1597 			view->focus_child = 1;
1598 		} else if (view->parent) {
1599 			view->focussed = 0;
1600 			view->parent->focussed = 1;
1601 			view->parent->focus_child = 0;
1602 			if (!view_is_splitscreen(view)) {
1603 				if (view->parent->resize) {
1604 					err = view->parent->resize(view->parent,
1605 					    0);
1606 					if (err)
1607 						return err;
1608 				}
1609 				offset_selection_up(view->parent);
1610 				err = view_fullscreen(view->parent);
1611 				if (err)
1612 					return err;
1613 			}
1614 		}
1615 		break;
1616 	case 'q':
1617 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1618 			if (view->parent->resize) {
1619 				/* might need more commits to fill fullscreen */
1620 				err = view->parent->resize(view->parent, 0);
1621 				if (err)
1622 					break;
1623 			}
1624 			offset_selection_up(view->parent);
1625 		}
1626 		err = view->input(new, view, ch);
1627 		view->dying = 1;
1628 		break;
1629 	case 'Q':
1630 		*done = 1;
1631 		break;
1632 	case 'F':
1633 		view->count = 0;
1634 		if (view_is_parent_view(view)) {
1635 			if (view->child == NULL)
1636 				break;
1637 			if (view_is_splitscreen(view->child)) {
1638 				view->focussed = 0;
1639 				view->child->focussed = 1;
1640 				err = view_fullscreen(view->child);
1641 			} else {
1642 				err = view_splitscreen(view->child);
1643 				if (!err)
1644 					err = view_resize_split(view, 0);
1645 			}
1646 			if (err)
1647 				break;
1648 			err = view->child->input(new, view->child,
1649 			    KEY_RESIZE);
1650 		} else {
1651 			if (view_is_splitscreen(view)) {
1652 				view->parent->focussed = 0;
1653 				view->focussed = 1;
1654 				err = view_fullscreen(view);
1655 			} else {
1656 				err = view_splitscreen(view);
1657 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1658 					err = view_resize(view->parent);
1659 				if (!err)
1660 					err = view_resize_split(view, 0);
1661 			}
1662 			if (err)
1663 				break;
1664 			err = view->input(new, view, KEY_RESIZE);
1665 		}
1666 		if (err)
1667 			break;
1668 		if (view->resize) {
1669 			err = view->resize(view, 0);
1670 			if (err)
1671 				break;
1672 		}
1673 		if (view->parent)
1674 			err = offset_selection_down(view->parent);
1675 		if (!err)
1676 			err = offset_selection_down(view);
1677 		break;
1678 	case 'S':
1679 		view->count = 0;
1680 		err = switch_split(view);
1681 		break;
1682 	case '-':
1683 		err = view_resize_split(view, -1);
1684 		break;
1685 	case '+':
1686 		err = view_resize_split(view, 1);
1687 		break;
1688 	case KEY_RESIZE:
1689 		break;
1690 	case '/':
1691 		view->count = 0;
1692 		if (view->search_start)
1693 			view_search_start(view, fast_refresh);
1694 		else
1695 			err = view->input(new, view, ch);
1696 		break;
1697 	case 'N':
1698 	case 'n':
1699 		if (view->search_started && view->search_next) {
1700 			view->searching = (ch == 'n' ?
1701 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1702 			view->search_next_done = 0;
1703 			view->search_next(view);
1704 		} else
1705 			err = view->input(new, view, ch);
1706 		break;
1707 	case 'A':
1708 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1709 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1710 			view->action = "Patience diff algorithm";
1711 		} else {
1712 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1713 			view->action = "Myers diff algorithm";
1714 		}
1715 		TAILQ_FOREACH(v, views, entry) {
1716 			if (v->reset) {
1717 				err = v->reset(v);
1718 				if (err)
1719 					return err;
1720 			}
1721 			if (v->child && v->child->reset) {
1722 				err = v->child->reset(v->child);
1723 				if (err)
1724 					return err;
1725 			}
1726 		}
1727 		break;
1728 	default:
1729 		err = view->input(new, view, ch);
1730 		break;
1731 	}
1732 
1733 	return err;
1734 }
1735 
1736 static int
1737 view_needs_focus_indication(struct tog_view *view)
1738 {
1739 	if (view_is_parent_view(view)) {
1740 		if (view->child == NULL || view->child->focussed)
1741 			return 0;
1742 		if (!view_is_splitscreen(view->child))
1743 			return 0;
1744 	} else if (!view_is_splitscreen(view))
1745 		return 0;
1746 
1747 	return view->focussed;
1748 }
1749 
1750 static const struct got_error *
1751 view_loop(struct tog_view *view)
1752 {
1753 	const struct got_error *err = NULL;
1754 	struct tog_view_list_head views;
1755 	struct tog_view *new_view;
1756 	char *mode;
1757 	int fast_refresh = 10;
1758 	int done = 0, errcode;
1759 
1760 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1761 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1762 		view->mode = TOG_VIEW_SPLIT_VERT;
1763 	else
1764 		view->mode = TOG_VIEW_SPLIT_HRZN;
1765 
1766 	errcode = pthread_mutex_lock(&tog_mutex);
1767 	if (errcode)
1768 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1769 
1770 	TAILQ_INIT(&views);
1771 	TAILQ_INSERT_HEAD(&views, view, entry);
1772 
1773 	view->focussed = 1;
1774 	err = view->show(view);
1775 	if (err)
1776 		return err;
1777 	update_panels();
1778 	doupdate();
1779 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1780 	    !tog_fatal_signal_received()) {
1781 		/* Refresh fast during initialization, then become slower. */
1782 		if (fast_refresh && --fast_refresh == 0)
1783 			halfdelay(10); /* switch to once per second */
1784 
1785 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1786 		if (err)
1787 			break;
1788 
1789 		if (view->dying && view == TAILQ_FIRST(&views) &&
1790 		    TAILQ_NEXT(view, entry) == NULL)
1791 			done = 1;
1792 		if (done) {
1793 			struct tog_view *v;
1794 
1795 			/*
1796 			 * When we quit, scroll the screen up a single line
1797 			 * so we don't lose any information.
1798 			 */
1799 			TAILQ_FOREACH(v, &views, entry) {
1800 				wmove(v->window, 0, 0);
1801 				wdeleteln(v->window);
1802 				wnoutrefresh(v->window);
1803 				if (v->child && !view_is_fullscreen(v)) {
1804 					wmove(v->child->window, 0, 0);
1805 					wdeleteln(v->child->window);
1806 					wnoutrefresh(v->child->window);
1807 				}
1808 			}
1809 			doupdate();
1810 		}
1811 
1812 		if (view->dying) {
1813 			struct tog_view *v, *prev = NULL;
1814 
1815 			if (view_is_parent_view(view))
1816 				prev = TAILQ_PREV(view, tog_view_list_head,
1817 				    entry);
1818 			else if (view->parent)
1819 				prev = view->parent;
1820 
1821 			if (view->parent) {
1822 				view->parent->child = NULL;
1823 				view->parent->focus_child = 0;
1824 				/* Restore fullscreen line height. */
1825 				view->parent->nlines = view->parent->lines;
1826 				err = view_resize(view->parent);
1827 				if (err)
1828 					break;
1829 				/* Make resized splits persist. */
1830 				view_transfer_size(view->parent, view);
1831 			} else
1832 				TAILQ_REMOVE(&views, view, entry);
1833 
1834 			err = view_close(view);
1835 			if (err)
1836 				goto done;
1837 
1838 			view = NULL;
1839 			TAILQ_FOREACH(v, &views, entry) {
1840 				if (v->focussed)
1841 					break;
1842 			}
1843 			if (view == NULL && new_view == NULL) {
1844 				/* No view has focus. Try to pick one. */
1845 				if (prev)
1846 					view = prev;
1847 				else if (!TAILQ_EMPTY(&views)) {
1848 					view = TAILQ_LAST(&views,
1849 					    tog_view_list_head);
1850 				}
1851 				if (view) {
1852 					if (view->focus_child) {
1853 						view->child->focussed = 1;
1854 						view = view->child;
1855 					} else
1856 						view->focussed = 1;
1857 				}
1858 			}
1859 		}
1860 		if (new_view) {
1861 			struct tog_view *v, *t;
1862 			/* Only allow one parent view per type. */
1863 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1864 				if (v->type != new_view->type)
1865 					continue;
1866 				TAILQ_REMOVE(&views, v, entry);
1867 				err = view_close(v);
1868 				if (err)
1869 					goto done;
1870 				break;
1871 			}
1872 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1873 			view = new_view;
1874 		}
1875 		if (view && !done) {
1876 			if (view_is_parent_view(view)) {
1877 				if (view->child && view->child->focussed)
1878 					view = view->child;
1879 			} else {
1880 				if (view->parent && view->parent->focussed)
1881 					view = view->parent;
1882 			}
1883 			show_panel(view->panel);
1884 			if (view->child && view_is_splitscreen(view->child))
1885 				show_panel(view->child->panel);
1886 			if (view->parent && view_is_splitscreen(view)) {
1887 				err = view->parent->show(view->parent);
1888 				if (err)
1889 					goto done;
1890 			}
1891 			err = view->show(view);
1892 			if (err)
1893 				goto done;
1894 			if (view->child) {
1895 				err = view->child->show(view->child);
1896 				if (err)
1897 					goto done;
1898 			}
1899 			update_panels();
1900 			doupdate();
1901 		}
1902 	}
1903 done:
1904 	while (!TAILQ_EMPTY(&views)) {
1905 		const struct got_error *close_err;
1906 		view = TAILQ_FIRST(&views);
1907 		TAILQ_REMOVE(&views, view, entry);
1908 		close_err = view_close(view);
1909 		if (close_err && err == NULL)
1910 			err = close_err;
1911 	}
1912 
1913 	errcode = pthread_mutex_unlock(&tog_mutex);
1914 	if (errcode && err == NULL)
1915 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1916 
1917 	return err;
1918 }
1919 
1920 __dead static void
1921 usage_log(void)
1922 {
1923 	endwin();
1924 	fprintf(stderr,
1925 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1926 	    getprogname());
1927 	exit(1);
1928 }
1929 
1930 /* Create newly allocated wide-character string equivalent to a byte string. */
1931 static const struct got_error *
1932 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1933 {
1934 	char *vis = NULL;
1935 	const struct got_error *err = NULL;
1936 
1937 	*ws = NULL;
1938 	*wlen = mbstowcs(NULL, s, 0);
1939 	if (*wlen == (size_t)-1) {
1940 		int vislen;
1941 		if (errno != EILSEQ)
1942 			return got_error_from_errno("mbstowcs");
1943 
1944 		/* byte string invalid in current encoding; try to "fix" it */
1945 		err = got_mbsavis(&vis, &vislen, s);
1946 		if (err)
1947 			return err;
1948 		*wlen = mbstowcs(NULL, vis, 0);
1949 		if (*wlen == (size_t)-1) {
1950 			err = got_error_from_errno("mbstowcs"); /* give up */
1951 			goto done;
1952 		}
1953 	}
1954 
1955 	*ws = calloc(*wlen + 1, sizeof(**ws));
1956 	if (*ws == NULL) {
1957 		err = got_error_from_errno("calloc");
1958 		goto done;
1959 	}
1960 
1961 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1962 		err = got_error_from_errno("mbstowcs");
1963 done:
1964 	free(vis);
1965 	if (err) {
1966 		free(*ws);
1967 		*ws = NULL;
1968 		*wlen = 0;
1969 	}
1970 	return err;
1971 }
1972 
1973 static const struct got_error *
1974 expand_tab(char **ptr, const char *src)
1975 {
1976 	char	*dst;
1977 	size_t	 len, n, idx = 0, sz = 0;
1978 
1979 	*ptr = NULL;
1980 	n = len = strlen(src);
1981 	dst = malloc(n + 1);
1982 	if (dst == NULL)
1983 		return got_error_from_errno("malloc");
1984 
1985 	while (idx < len && src[idx]) {
1986 		const char c = src[idx];
1987 
1988 		if (c == '\t') {
1989 			size_t nb = TABSIZE - sz % TABSIZE;
1990 			char *p;
1991 
1992 			p = realloc(dst, n + nb);
1993 			if (p == NULL) {
1994 				free(dst);
1995 				return got_error_from_errno("realloc");
1996 
1997 			}
1998 			dst = p;
1999 			n += nb;
2000 			memset(dst + sz, ' ', nb);
2001 			sz += nb;
2002 		} else
2003 			dst[sz++] = src[idx];
2004 		++idx;
2005 	}
2006 
2007 	dst[sz] = '\0';
2008 	*ptr = dst;
2009 	return NULL;
2010 }
2011 
2012 /*
2013  * Advance at most n columns from wline starting at offset off.
2014  * Return the index to the first character after the span operation.
2015  * Return the combined column width of all spanned wide character in
2016  * *rcol.
2017  */
2018 static int
2019 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2020 {
2021 	int width, i, cols = 0;
2022 
2023 	if (n == 0) {
2024 		*rcol = cols;
2025 		return off;
2026 	}
2027 
2028 	for (i = off; wline[i] != L'\0'; ++i) {
2029 		if (wline[i] == L'\t')
2030 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2031 		else
2032 			width = wcwidth(wline[i]);
2033 
2034 		if (width == -1) {
2035 			width = 1;
2036 			wline[i] = L'.';
2037 		}
2038 
2039 		if (cols + width > n)
2040 			break;
2041 		cols += width;
2042 	}
2043 
2044 	*rcol = cols;
2045 	return i;
2046 }
2047 
2048 /*
2049  * Format a line for display, ensuring that it won't overflow a width limit.
2050  * With scrolling, the width returned refers to the scrolled version of the
2051  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2052  */
2053 static const struct got_error *
2054 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2055     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2056 {
2057 	const struct got_error *err = NULL;
2058 	int cols;
2059 	wchar_t *wline = NULL;
2060 	char *exstr = NULL;
2061 	size_t wlen;
2062 	int i, scrollx;
2063 
2064 	*wlinep = NULL;
2065 	*widthp = 0;
2066 
2067 	if (expand) {
2068 		err = expand_tab(&exstr, line);
2069 		if (err)
2070 			return err;
2071 	}
2072 
2073 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2074 	free(exstr);
2075 	if (err)
2076 		return err;
2077 
2078 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2079 
2080 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2081 		wline[wlen - 1] = L'\0';
2082 		wlen--;
2083 	}
2084 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2085 		wline[wlen - 1] = L'\0';
2086 		wlen--;
2087 	}
2088 
2089 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2090 	wline[i] = L'\0';
2091 
2092 	if (widthp)
2093 		*widthp = cols;
2094 	if (scrollxp)
2095 		*scrollxp = scrollx;
2096 	if (err)
2097 		free(wline);
2098 	else
2099 		*wlinep = wline;
2100 	return err;
2101 }
2102 
2103 static const struct got_error*
2104 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2105     struct got_object_id *id, struct got_repository *repo)
2106 {
2107 	static const struct got_error *err = NULL;
2108 	struct got_reflist_entry *re;
2109 	char *s;
2110 	const char *name;
2111 
2112 	*refs_str = NULL;
2113 
2114 	TAILQ_FOREACH(re, refs, entry) {
2115 		struct got_tag_object *tag = NULL;
2116 		struct got_object_id *ref_id;
2117 		int cmp;
2118 
2119 		name = got_ref_get_name(re->ref);
2120 		if (strcmp(name, GOT_REF_HEAD) == 0)
2121 			continue;
2122 		if (strncmp(name, "refs/", 5) == 0)
2123 			name += 5;
2124 		if (strncmp(name, "got/", 4) == 0 &&
2125 		    strncmp(name, "got/backup/", 11) != 0)
2126 			continue;
2127 		if (strncmp(name, "heads/", 6) == 0)
2128 			name += 6;
2129 		if (strncmp(name, "remotes/", 8) == 0) {
2130 			name += 8;
2131 			s = strstr(name, "/" GOT_REF_HEAD);
2132 			if (s != NULL && s[strlen(s)] == '\0')
2133 				continue;
2134 		}
2135 		err = got_ref_resolve(&ref_id, repo, re->ref);
2136 		if (err)
2137 			break;
2138 		if (strncmp(name, "tags/", 5) == 0) {
2139 			err = got_object_open_as_tag(&tag, repo, ref_id);
2140 			if (err) {
2141 				if (err->code != GOT_ERR_OBJ_TYPE) {
2142 					free(ref_id);
2143 					break;
2144 				}
2145 				/* Ref points at something other than a tag. */
2146 				err = NULL;
2147 				tag = NULL;
2148 			}
2149 		}
2150 		cmp = got_object_id_cmp(tag ?
2151 		    got_object_tag_get_object_id(tag) : ref_id, id);
2152 		free(ref_id);
2153 		if (tag)
2154 			got_object_tag_close(tag);
2155 		if (cmp != 0)
2156 			continue;
2157 		s = *refs_str;
2158 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2159 		    s ? ", " : "", name) == -1) {
2160 			err = got_error_from_errno("asprintf");
2161 			free(s);
2162 			*refs_str = NULL;
2163 			break;
2164 		}
2165 		free(s);
2166 	}
2167 
2168 	return err;
2169 }
2170 
2171 static const struct got_error *
2172 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2173     int col_tab_align)
2174 {
2175 	char *smallerthan;
2176 
2177 	smallerthan = strchr(author, '<');
2178 	if (smallerthan && smallerthan[1] != '\0')
2179 		author = smallerthan + 1;
2180 	author[strcspn(author, "@>")] = '\0';
2181 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2182 	    col_tab_align, 0);
2183 }
2184 
2185 static const struct got_error *
2186 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2187     struct got_object_id *id, const size_t date_display_cols,
2188     int author_display_cols)
2189 {
2190 	struct tog_log_view_state *s = &view->state.log;
2191 	const struct got_error *err = NULL;
2192 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2193 	char *logmsg0 = NULL, *logmsg = NULL;
2194 	char *author = NULL;
2195 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2196 	int author_width, logmsg_width;
2197 	char *newline, *line = NULL;
2198 	int col, limit, scrollx;
2199 	const int avail = view->ncols;
2200 	struct tm tm;
2201 	time_t committer_time;
2202 	struct tog_color *tc;
2203 
2204 	committer_time = got_object_commit_get_committer_time(commit);
2205 	if (gmtime_r(&committer_time, &tm) == NULL)
2206 		return got_error_from_errno("gmtime_r");
2207 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2208 		return got_error(GOT_ERR_NO_SPACE);
2209 
2210 	if (avail <= date_display_cols)
2211 		limit = MIN(sizeof(datebuf) - 1, avail);
2212 	else
2213 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2214 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2215 	if (tc)
2216 		wattr_on(view->window,
2217 		    COLOR_PAIR(tc->colorpair), NULL);
2218 	waddnstr(view->window, datebuf, limit);
2219 	if (tc)
2220 		wattr_off(view->window,
2221 		    COLOR_PAIR(tc->colorpair), NULL);
2222 	col = limit;
2223 	if (col > avail)
2224 		goto done;
2225 
2226 	if (avail >= 120) {
2227 		char *id_str;
2228 		err = got_object_id_str(&id_str, id);
2229 		if (err)
2230 			goto done;
2231 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2232 		if (tc)
2233 			wattr_on(view->window,
2234 			    COLOR_PAIR(tc->colorpair), NULL);
2235 		wprintw(view->window, "%.8s ", id_str);
2236 		if (tc)
2237 			wattr_off(view->window,
2238 			    COLOR_PAIR(tc->colorpair), NULL);
2239 		free(id_str);
2240 		col += 9;
2241 		if (col > avail)
2242 			goto done;
2243 	}
2244 
2245 	if (s->use_committer)
2246 		author = strdup(got_object_commit_get_committer(commit));
2247 	else
2248 		author = strdup(got_object_commit_get_author(commit));
2249 	if (author == NULL) {
2250 		err = got_error_from_errno("strdup");
2251 		goto done;
2252 	}
2253 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2254 	if (err)
2255 		goto done;
2256 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2257 	if (tc)
2258 		wattr_on(view->window,
2259 		    COLOR_PAIR(tc->colorpair), NULL);
2260 	waddwstr(view->window, wauthor);
2261 	col += author_width;
2262 	while (col < avail && author_width < author_display_cols + 2) {
2263 		waddch(view->window, ' ');
2264 		col++;
2265 		author_width++;
2266 	}
2267 	if (tc)
2268 		wattr_off(view->window,
2269 		    COLOR_PAIR(tc->colorpair), NULL);
2270 	if (col > avail)
2271 		goto done;
2272 
2273 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2274 	if (err)
2275 		goto done;
2276 	logmsg = logmsg0;
2277 	while (*logmsg == '\n')
2278 		logmsg++;
2279 	newline = strchr(logmsg, '\n');
2280 	if (newline)
2281 		*newline = '\0';
2282 	limit = avail - col;
2283 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2284 		limit--;	/* for the border */
2285 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2286 	    limit, col, 1);
2287 	if (err)
2288 		goto done;
2289 	waddwstr(view->window, &wlogmsg[scrollx]);
2290 	col += MAX(logmsg_width, 0);
2291 	while (col < avail) {
2292 		waddch(view->window, ' ');
2293 		col++;
2294 	}
2295 done:
2296 	free(logmsg0);
2297 	free(wlogmsg);
2298 	free(author);
2299 	free(wauthor);
2300 	free(line);
2301 	return err;
2302 }
2303 
2304 static struct commit_queue_entry *
2305 alloc_commit_queue_entry(struct got_commit_object *commit,
2306     struct got_object_id *id)
2307 {
2308 	struct commit_queue_entry *entry;
2309 	struct got_object_id *dup;
2310 
2311 	entry = calloc(1, sizeof(*entry));
2312 	if (entry == NULL)
2313 		return NULL;
2314 
2315 	dup = got_object_id_dup(id);
2316 	if (dup == NULL) {
2317 		free(entry);
2318 		return NULL;
2319 	}
2320 
2321 	entry->id = dup;
2322 	entry->commit = commit;
2323 	return entry;
2324 }
2325 
2326 static void
2327 pop_commit(struct commit_queue *commits)
2328 {
2329 	struct commit_queue_entry *entry;
2330 
2331 	entry = TAILQ_FIRST(&commits->head);
2332 	TAILQ_REMOVE(&commits->head, entry, entry);
2333 	got_object_commit_close(entry->commit);
2334 	commits->ncommits--;
2335 	free(entry->id);
2336 	free(entry);
2337 }
2338 
2339 static void
2340 free_commits(struct commit_queue *commits)
2341 {
2342 	while (!TAILQ_EMPTY(&commits->head))
2343 		pop_commit(commits);
2344 }
2345 
2346 static const struct got_error *
2347 match_commit(int *have_match, struct got_object_id *id,
2348     struct got_commit_object *commit, regex_t *regex)
2349 {
2350 	const struct got_error *err = NULL;
2351 	regmatch_t regmatch;
2352 	char *id_str = NULL, *logmsg = NULL;
2353 
2354 	*have_match = 0;
2355 
2356 	err = got_object_id_str(&id_str, id);
2357 	if (err)
2358 		return err;
2359 
2360 	err = got_object_commit_get_logmsg(&logmsg, commit);
2361 	if (err)
2362 		goto done;
2363 
2364 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2365 	    &regmatch, 0) == 0 ||
2366 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2367 	    &regmatch, 0) == 0 ||
2368 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2369 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2370 		*have_match = 1;
2371 done:
2372 	free(id_str);
2373 	free(logmsg);
2374 	return err;
2375 }
2376 
2377 static const struct got_error *
2378 queue_commits(struct tog_log_thread_args *a)
2379 {
2380 	const struct got_error *err = NULL;
2381 
2382 	/*
2383 	 * We keep all commits open throughout the lifetime of the log
2384 	 * view in order to avoid having to re-fetch commits from disk
2385 	 * while updating the display.
2386 	 */
2387 	do {
2388 		struct got_object_id id;
2389 		struct got_commit_object *commit;
2390 		struct commit_queue_entry *entry;
2391 		int limit_match = 0;
2392 		int errcode;
2393 
2394 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2395 		    NULL, NULL);
2396 		if (err)
2397 			break;
2398 
2399 		err = got_object_open_as_commit(&commit, a->repo, &id);
2400 		if (err)
2401 			break;
2402 		entry = alloc_commit_queue_entry(commit, &id);
2403 		if (entry == NULL) {
2404 			err = got_error_from_errno("alloc_commit_queue_entry");
2405 			break;
2406 		}
2407 
2408 		errcode = pthread_mutex_lock(&tog_mutex);
2409 		if (errcode) {
2410 			err = got_error_set_errno(errcode,
2411 			    "pthread_mutex_lock");
2412 			break;
2413 		}
2414 
2415 		entry->idx = a->real_commits->ncommits;
2416 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2417 		a->real_commits->ncommits++;
2418 
2419 		if (*a->limiting) {
2420 			err = match_commit(&limit_match, &id, commit,
2421 			    a->limit_regex);
2422 			if (err)
2423 				break;
2424 
2425 			if (limit_match) {
2426 				struct commit_queue_entry *matched;
2427 
2428 				matched = alloc_commit_queue_entry(
2429 				    entry->commit, entry->id);
2430 				if (matched == NULL) {
2431 					err = got_error_from_errno(
2432 					    "alloc_commit_queue_entry");
2433 					break;
2434 				}
2435 				matched->commit = entry->commit;
2436 				got_object_commit_retain(entry->commit);
2437 
2438 				matched->idx = a->limit_commits->ncommits;
2439 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2440 				    matched, entry);
2441 				a->limit_commits->ncommits++;
2442 			}
2443 
2444 			/*
2445 			 * This is how we signal log_thread() that we
2446 			 * have found a match, and that it should be
2447 			 * counted as a new entry for the view.
2448 			 */
2449 			a->limit_match = limit_match;
2450 		}
2451 
2452 		if (*a->searching == TOG_SEARCH_FORWARD &&
2453 		    !*a->search_next_done) {
2454 			int have_match;
2455 			err = match_commit(&have_match, &id, commit, a->regex);
2456 			if (err)
2457 				break;
2458 
2459 			if (*a->limiting) {
2460 				if (limit_match && have_match)
2461 					*a->search_next_done =
2462 					    TOG_SEARCH_HAVE_MORE;
2463 			} else if (have_match)
2464 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2465 		}
2466 
2467 		errcode = pthread_mutex_unlock(&tog_mutex);
2468 		if (errcode && err == NULL)
2469 			err = got_error_set_errno(errcode,
2470 			    "pthread_mutex_unlock");
2471 		if (err)
2472 			break;
2473 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2474 
2475 	return err;
2476 }
2477 
2478 static void
2479 select_commit(struct tog_log_view_state *s)
2480 {
2481 	struct commit_queue_entry *entry;
2482 	int ncommits = 0;
2483 
2484 	entry = s->first_displayed_entry;
2485 	while (entry) {
2486 		if (ncommits == s->selected) {
2487 			s->selected_entry = entry;
2488 			break;
2489 		}
2490 		entry = TAILQ_NEXT(entry, entry);
2491 		ncommits++;
2492 	}
2493 }
2494 
2495 static const struct got_error *
2496 draw_commits(struct tog_view *view)
2497 {
2498 	const struct got_error *err = NULL;
2499 	struct tog_log_view_state *s = &view->state.log;
2500 	struct commit_queue_entry *entry = s->selected_entry;
2501 	int limit = view->nlines;
2502 	int width;
2503 	int ncommits, author_cols = 4;
2504 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2505 	char *refs_str = NULL;
2506 	wchar_t *wline;
2507 	struct tog_color *tc;
2508 	static const size_t date_display_cols = 12;
2509 
2510 	if (view_is_hsplit_top(view))
2511 		--limit;  /* account for border */
2512 
2513 	if (s->selected_entry &&
2514 	    !(view->searching && view->search_next_done == 0)) {
2515 		struct got_reflist_head *refs;
2516 		err = got_object_id_str(&id_str, s->selected_entry->id);
2517 		if (err)
2518 			return err;
2519 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2520 		    s->selected_entry->id);
2521 		if (refs) {
2522 			err = build_refs_str(&refs_str, refs,
2523 			    s->selected_entry->id, s->repo);
2524 			if (err)
2525 				goto done;
2526 		}
2527 	}
2528 
2529 	if (s->thread_args.commits_needed == 0)
2530 		halfdelay(10); /* disable fast refresh */
2531 
2532 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2533 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2534 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2535 		    (view->searching && !view->search_next_done) ?
2536 		    "searching..." : "loading...") == -1) {
2537 			err = got_error_from_errno("asprintf");
2538 			goto done;
2539 		}
2540 	} else {
2541 		const char *search_str = NULL;
2542 		const char *limit_str = NULL;
2543 
2544 		if (view->searching) {
2545 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2546 				search_str = "no more matches";
2547 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2548 				search_str = "no matches found";
2549 			else if (!view->search_next_done)
2550 				search_str = "searching...";
2551 		}
2552 
2553 		if (s->limit_view && s->commits->ncommits == 0)
2554 			limit_str = "no matches found";
2555 
2556 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2557 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2558 		    search_str ? search_str : (refs_str ? refs_str : ""),
2559 		    limit_str ? limit_str : "") == -1) {
2560 			err = got_error_from_errno("asprintf");
2561 			goto done;
2562 		}
2563 	}
2564 
2565 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2566 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2567 		    "........................................",
2568 		    s->in_repo_path, ncommits_str) == -1) {
2569 			err = got_error_from_errno("asprintf");
2570 			header = NULL;
2571 			goto done;
2572 		}
2573 	} else if (asprintf(&header, "commit %s%s",
2574 	    id_str ? id_str : "........................................",
2575 	    ncommits_str) == -1) {
2576 		err = got_error_from_errno("asprintf");
2577 		header = NULL;
2578 		goto done;
2579 	}
2580 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2581 	if (err)
2582 		goto done;
2583 
2584 	werase(view->window);
2585 
2586 	if (view_needs_focus_indication(view))
2587 		wstandout(view->window);
2588 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2589 	if (tc)
2590 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2591 	waddwstr(view->window, wline);
2592 	while (width < view->ncols) {
2593 		waddch(view->window, ' ');
2594 		width++;
2595 	}
2596 	if (tc)
2597 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2598 	if (view_needs_focus_indication(view))
2599 		wstandend(view->window);
2600 	free(wline);
2601 	if (limit <= 1)
2602 		goto done;
2603 
2604 	/* Grow author column size if necessary, and set view->maxx. */
2605 	entry = s->first_displayed_entry;
2606 	ncommits = 0;
2607 	view->maxx = 0;
2608 	while (entry) {
2609 		struct got_commit_object *c = entry->commit;
2610 		char *author, *eol, *msg, *msg0;
2611 		wchar_t *wauthor, *wmsg;
2612 		int width;
2613 		if (ncommits >= limit - 1)
2614 			break;
2615 		if (s->use_committer)
2616 			author = strdup(got_object_commit_get_committer(c));
2617 		else
2618 			author = strdup(got_object_commit_get_author(c));
2619 		if (author == NULL) {
2620 			err = got_error_from_errno("strdup");
2621 			goto done;
2622 		}
2623 		err = format_author(&wauthor, &width, author, COLS,
2624 		    date_display_cols);
2625 		if (author_cols < width)
2626 			author_cols = width;
2627 		free(wauthor);
2628 		free(author);
2629 		if (err)
2630 			goto done;
2631 		err = got_object_commit_get_logmsg(&msg0, c);
2632 		if (err)
2633 			goto done;
2634 		msg = msg0;
2635 		while (*msg == '\n')
2636 			++msg;
2637 		if ((eol = strchr(msg, '\n')))
2638 			*eol = '\0';
2639 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2640 		    date_display_cols + author_cols, 0);
2641 		if (err)
2642 			goto done;
2643 		view->maxx = MAX(view->maxx, width);
2644 		free(msg0);
2645 		free(wmsg);
2646 		ncommits++;
2647 		entry = TAILQ_NEXT(entry, entry);
2648 	}
2649 
2650 	entry = s->first_displayed_entry;
2651 	s->last_displayed_entry = s->first_displayed_entry;
2652 	ncommits = 0;
2653 	while (entry) {
2654 		if (ncommits >= limit - 1)
2655 			break;
2656 		if (ncommits == s->selected)
2657 			wstandout(view->window);
2658 		err = draw_commit(view, entry->commit, entry->id,
2659 		    date_display_cols, author_cols);
2660 		if (ncommits == s->selected)
2661 			wstandend(view->window);
2662 		if (err)
2663 			goto done;
2664 		ncommits++;
2665 		s->last_displayed_entry = entry;
2666 		entry = TAILQ_NEXT(entry, entry);
2667 	}
2668 
2669 	view_border(view);
2670 done:
2671 	free(id_str);
2672 	free(refs_str);
2673 	free(ncommits_str);
2674 	free(header);
2675 	return err;
2676 }
2677 
2678 static void
2679 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2680 {
2681 	struct commit_queue_entry *entry;
2682 	int nscrolled = 0;
2683 
2684 	entry = TAILQ_FIRST(&s->commits->head);
2685 	if (s->first_displayed_entry == entry)
2686 		return;
2687 
2688 	entry = s->first_displayed_entry;
2689 	while (entry && nscrolled < maxscroll) {
2690 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2691 		if (entry) {
2692 			s->first_displayed_entry = entry;
2693 			nscrolled++;
2694 		}
2695 	}
2696 }
2697 
2698 static const struct got_error *
2699 trigger_log_thread(struct tog_view *view, int wait)
2700 {
2701 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2702 	int errcode;
2703 
2704 	halfdelay(1); /* fast refresh while loading commits */
2705 
2706 	while (!ta->log_complete && !tog_thread_error &&
2707 	    (ta->commits_needed > 0 || ta->load_all)) {
2708 		/* Wake the log thread. */
2709 		errcode = pthread_cond_signal(&ta->need_commits);
2710 		if (errcode)
2711 			return got_error_set_errno(errcode,
2712 			    "pthread_cond_signal");
2713 
2714 		/*
2715 		 * The mutex will be released while the view loop waits
2716 		 * in wgetch(), at which time the log thread will run.
2717 		 */
2718 		if (!wait)
2719 			break;
2720 
2721 		/* Display progress update in log view. */
2722 		show_log_view(view);
2723 		update_panels();
2724 		doupdate();
2725 
2726 		/* Wait right here while next commit is being loaded. */
2727 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2728 		if (errcode)
2729 			return got_error_set_errno(errcode,
2730 			    "pthread_cond_wait");
2731 
2732 		/* Display progress update in log view. */
2733 		show_log_view(view);
2734 		update_panels();
2735 		doupdate();
2736 	}
2737 
2738 	return NULL;
2739 }
2740 
2741 static const struct got_error *
2742 request_log_commits(struct tog_view *view)
2743 {
2744 	struct tog_log_view_state	*state = &view->state.log;
2745 	const struct got_error		*err = NULL;
2746 
2747 	if (state->thread_args.log_complete)
2748 		return NULL;
2749 
2750 	state->thread_args.commits_needed += view->nscrolled;
2751 	err = trigger_log_thread(view, 1);
2752 	view->nscrolled = 0;
2753 
2754 	return err;
2755 }
2756 
2757 static const struct got_error *
2758 log_scroll_down(struct tog_view *view, int maxscroll)
2759 {
2760 	struct tog_log_view_state *s = &view->state.log;
2761 	const struct got_error *err = NULL;
2762 	struct commit_queue_entry *pentry;
2763 	int nscrolled = 0, ncommits_needed;
2764 
2765 	if (s->last_displayed_entry == NULL)
2766 		return NULL;
2767 
2768 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2769 	if (s->commits->ncommits < ncommits_needed &&
2770 	    !s->thread_args.log_complete) {
2771 		/*
2772 		 * Ask the log thread for required amount of commits.
2773 		 */
2774 		s->thread_args.commits_needed +=
2775 		    ncommits_needed - s->commits->ncommits;
2776 		err = trigger_log_thread(view, 1);
2777 		if (err)
2778 			return err;
2779 	}
2780 
2781 	do {
2782 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2783 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2784 			break;
2785 
2786 		s->last_displayed_entry = pentry ?
2787 		    pentry : s->last_displayed_entry;
2788 
2789 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2790 		if (pentry == NULL)
2791 			break;
2792 		s->first_displayed_entry = pentry;
2793 	} while (++nscrolled < maxscroll);
2794 
2795 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2796 		view->nscrolled += nscrolled;
2797 	else
2798 		view->nscrolled = 0;
2799 
2800 	return err;
2801 }
2802 
2803 static const struct got_error *
2804 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2805     struct got_commit_object *commit, struct got_object_id *commit_id,
2806     struct tog_view *log_view, struct got_repository *repo)
2807 {
2808 	const struct got_error *err;
2809 	struct got_object_qid *parent_id;
2810 	struct tog_view *diff_view;
2811 
2812 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2813 	if (diff_view == NULL)
2814 		return got_error_from_errno("view_open");
2815 
2816 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2817 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2818 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2819 	if (err == NULL)
2820 		*new_view = diff_view;
2821 	return err;
2822 }
2823 
2824 static const struct got_error *
2825 tree_view_visit_subtree(struct tog_tree_view_state *s,
2826     struct got_tree_object *subtree)
2827 {
2828 	struct tog_parent_tree *parent;
2829 
2830 	parent = calloc(1, sizeof(*parent));
2831 	if (parent == NULL)
2832 		return got_error_from_errno("calloc");
2833 
2834 	parent->tree = s->tree;
2835 	parent->first_displayed_entry = s->first_displayed_entry;
2836 	parent->selected_entry = s->selected_entry;
2837 	parent->selected = s->selected;
2838 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2839 	s->tree = subtree;
2840 	s->selected = 0;
2841 	s->first_displayed_entry = NULL;
2842 	return NULL;
2843 }
2844 
2845 static const struct got_error *
2846 tree_view_walk_path(struct tog_tree_view_state *s,
2847     struct got_commit_object *commit, const char *path)
2848 {
2849 	const struct got_error *err = NULL;
2850 	struct got_tree_object *tree = NULL;
2851 	const char *p;
2852 	char *slash, *subpath = NULL;
2853 
2854 	/* Walk the path and open corresponding tree objects. */
2855 	p = path;
2856 	while (*p) {
2857 		struct got_tree_entry *te;
2858 		struct got_object_id *tree_id;
2859 		char *te_name;
2860 
2861 		while (p[0] == '/')
2862 			p++;
2863 
2864 		/* Ensure the correct subtree entry is selected. */
2865 		slash = strchr(p, '/');
2866 		if (slash == NULL)
2867 			te_name = strdup(p);
2868 		else
2869 			te_name = strndup(p, slash - p);
2870 		if (te_name == NULL) {
2871 			err = got_error_from_errno("strndup");
2872 			break;
2873 		}
2874 		te = got_object_tree_find_entry(s->tree, te_name);
2875 		if (te == NULL) {
2876 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2877 			free(te_name);
2878 			break;
2879 		}
2880 		free(te_name);
2881 		s->first_displayed_entry = s->selected_entry = te;
2882 
2883 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2884 			break; /* jump to this file's entry */
2885 
2886 		slash = strchr(p, '/');
2887 		if (slash)
2888 			subpath = strndup(path, slash - path);
2889 		else
2890 			subpath = strdup(path);
2891 		if (subpath == NULL) {
2892 			err = got_error_from_errno("strdup");
2893 			break;
2894 		}
2895 
2896 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2897 		    subpath);
2898 		if (err)
2899 			break;
2900 
2901 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2902 		free(tree_id);
2903 		if (err)
2904 			break;
2905 
2906 		err = tree_view_visit_subtree(s, tree);
2907 		if (err) {
2908 			got_object_tree_close(tree);
2909 			break;
2910 		}
2911 		if (slash == NULL)
2912 			break;
2913 		free(subpath);
2914 		subpath = NULL;
2915 		p = slash;
2916 	}
2917 
2918 	free(subpath);
2919 	return err;
2920 }
2921 
2922 static const struct got_error *
2923 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2924     struct commit_queue_entry *entry, const char *path,
2925     const char *head_ref_name, struct got_repository *repo)
2926 {
2927 	const struct got_error *err = NULL;
2928 	struct tog_tree_view_state *s;
2929 	struct tog_view *tree_view;
2930 
2931 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2932 	if (tree_view == NULL)
2933 		return got_error_from_errno("view_open");
2934 
2935 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2936 	if (err)
2937 		return err;
2938 	s = &tree_view->state.tree;
2939 
2940 	*new_view = tree_view;
2941 
2942 	if (got_path_is_root_dir(path))
2943 		return NULL;
2944 
2945 	return tree_view_walk_path(s, entry->commit, path);
2946 }
2947 
2948 static const struct got_error *
2949 block_signals_used_by_main_thread(void)
2950 {
2951 	sigset_t sigset;
2952 	int errcode;
2953 
2954 	if (sigemptyset(&sigset) == -1)
2955 		return got_error_from_errno("sigemptyset");
2956 
2957 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2958 	if (sigaddset(&sigset, SIGWINCH) == -1)
2959 		return got_error_from_errno("sigaddset");
2960 	if (sigaddset(&sigset, SIGCONT) == -1)
2961 		return got_error_from_errno("sigaddset");
2962 	if (sigaddset(&sigset, SIGINT) == -1)
2963 		return got_error_from_errno("sigaddset");
2964 	if (sigaddset(&sigset, SIGTERM) == -1)
2965 		return got_error_from_errno("sigaddset");
2966 
2967 	/* ncurses handles SIGTSTP */
2968 	if (sigaddset(&sigset, SIGTSTP) == -1)
2969 		return got_error_from_errno("sigaddset");
2970 
2971 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2972 	if (errcode)
2973 		return got_error_set_errno(errcode, "pthread_sigmask");
2974 
2975 	return NULL;
2976 }
2977 
2978 static void *
2979 log_thread(void *arg)
2980 {
2981 	const struct got_error *err = NULL;
2982 	int errcode = 0;
2983 	struct tog_log_thread_args *a = arg;
2984 	int done = 0;
2985 
2986 	/*
2987 	 * Sync startup with main thread such that we begin our
2988 	 * work once view_input() has released the mutex.
2989 	 */
2990 	errcode = pthread_mutex_lock(&tog_mutex);
2991 	if (errcode) {
2992 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2993 		return (void *)err;
2994 	}
2995 
2996 	err = block_signals_used_by_main_thread();
2997 	if (err) {
2998 		pthread_mutex_unlock(&tog_mutex);
2999 		goto done;
3000 	}
3001 
3002 	while (!done && !err && !tog_fatal_signal_received()) {
3003 		errcode = pthread_mutex_unlock(&tog_mutex);
3004 		if (errcode) {
3005 			err = got_error_set_errno(errcode,
3006 			    "pthread_mutex_unlock");
3007 			goto done;
3008 		}
3009 		err = queue_commits(a);
3010 		if (err) {
3011 			if (err->code != GOT_ERR_ITER_COMPLETED)
3012 				goto done;
3013 			err = NULL;
3014 			done = 1;
3015 		} else if (a->commits_needed > 0 && !a->load_all) {
3016 			if (*a->limiting) {
3017 				if (a->limit_match)
3018 					a->commits_needed--;
3019 			} else
3020 				a->commits_needed--;
3021 		}
3022 
3023 		errcode = pthread_mutex_lock(&tog_mutex);
3024 		if (errcode) {
3025 			err = got_error_set_errno(errcode,
3026 			    "pthread_mutex_lock");
3027 			goto done;
3028 		} else if (*a->quit)
3029 			done = 1;
3030 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3031 			*a->first_displayed_entry =
3032 			    TAILQ_FIRST(&a->limit_commits->head);
3033 			*a->selected_entry = *a->first_displayed_entry;
3034 		} else if (*a->first_displayed_entry == NULL) {
3035 			*a->first_displayed_entry =
3036 			    TAILQ_FIRST(&a->real_commits->head);
3037 			*a->selected_entry = *a->first_displayed_entry;
3038 		}
3039 
3040 		errcode = pthread_cond_signal(&a->commit_loaded);
3041 		if (errcode) {
3042 			err = got_error_set_errno(errcode,
3043 			    "pthread_cond_signal");
3044 			pthread_mutex_unlock(&tog_mutex);
3045 			goto done;
3046 		}
3047 
3048 		if (done)
3049 			a->commits_needed = 0;
3050 		else {
3051 			if (a->commits_needed == 0 && !a->load_all) {
3052 				errcode = pthread_cond_wait(&a->need_commits,
3053 				    &tog_mutex);
3054 				if (errcode) {
3055 					err = got_error_set_errno(errcode,
3056 					    "pthread_cond_wait");
3057 					pthread_mutex_unlock(&tog_mutex);
3058 					goto done;
3059 				}
3060 				if (*a->quit)
3061 					done = 1;
3062 			}
3063 		}
3064 	}
3065 	a->log_complete = 1;
3066 	errcode = pthread_mutex_unlock(&tog_mutex);
3067 	if (errcode)
3068 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3069 done:
3070 	if (err) {
3071 		tog_thread_error = 1;
3072 		pthread_cond_signal(&a->commit_loaded);
3073 	}
3074 	return (void *)err;
3075 }
3076 
3077 static const struct got_error *
3078 stop_log_thread(struct tog_log_view_state *s)
3079 {
3080 	const struct got_error *err = NULL, *thread_err = NULL;
3081 	int errcode;
3082 
3083 	if (s->thread) {
3084 		s->quit = 1;
3085 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3086 		if (errcode)
3087 			return got_error_set_errno(errcode,
3088 			    "pthread_cond_signal");
3089 		errcode = pthread_mutex_unlock(&tog_mutex);
3090 		if (errcode)
3091 			return got_error_set_errno(errcode,
3092 			    "pthread_mutex_unlock");
3093 		errcode = pthread_join(s->thread, (void **)&thread_err);
3094 		if (errcode)
3095 			return got_error_set_errno(errcode, "pthread_join");
3096 		errcode = pthread_mutex_lock(&tog_mutex);
3097 		if (errcode)
3098 			return got_error_set_errno(errcode,
3099 			    "pthread_mutex_lock");
3100 		s->thread = 0; //NULL;
3101 	}
3102 
3103 	if (s->thread_args.repo) {
3104 		err = got_repo_close(s->thread_args.repo);
3105 		s->thread_args.repo = NULL;
3106 	}
3107 
3108 	if (s->thread_args.pack_fds) {
3109 		const struct got_error *pack_err =
3110 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3111 		if (err == NULL)
3112 			err = pack_err;
3113 		s->thread_args.pack_fds = NULL;
3114 	}
3115 
3116 	if (s->thread_args.graph) {
3117 		got_commit_graph_close(s->thread_args.graph);
3118 		s->thread_args.graph = NULL;
3119 	}
3120 
3121 	return err ? err : thread_err;
3122 }
3123 
3124 static const struct got_error *
3125 close_log_view(struct tog_view *view)
3126 {
3127 	const struct got_error *err = NULL;
3128 	struct tog_log_view_state *s = &view->state.log;
3129 	int errcode;
3130 
3131 	err = stop_log_thread(s);
3132 
3133 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3134 	if (errcode && err == NULL)
3135 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3136 
3137 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3138 	if (errcode && err == NULL)
3139 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3140 
3141 	free_commits(&s->limit_commits);
3142 	free_commits(&s->real_commits);
3143 	free(s->in_repo_path);
3144 	s->in_repo_path = NULL;
3145 	free(s->start_id);
3146 	s->start_id = NULL;
3147 	free(s->head_ref_name);
3148 	s->head_ref_name = NULL;
3149 	return err;
3150 }
3151 
3152 /*
3153  * We use two queues to implement the limit feature: first consists of
3154  * commits matching the current limit_regex; second is the real queue
3155  * of all known commits (real_commits). When the user starts limiting,
3156  * we swap queues such that all movement and displaying functionality
3157  * works with very slight change.
3158  */
3159 static const struct got_error *
3160 limit_log_view(struct tog_view *view)
3161 {
3162 	struct tog_log_view_state *s = &view->state.log;
3163 	struct commit_queue_entry *entry;
3164 	struct tog_view	*v = view;
3165 	const struct got_error *err = NULL;
3166 	char pattern[1024];
3167 	int ret;
3168 
3169 	if (view_is_hsplit_top(view))
3170 		v = view->child;
3171 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3172 		v = view->parent;
3173 
3174 	/* Get the pattern */
3175 	wmove(v->window, v->nlines - 1, 0);
3176 	wclrtoeol(v->window);
3177 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3178 	nodelay(v->window, FALSE);
3179 	nocbreak();
3180 	echo();
3181 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3182 	cbreak();
3183 	noecho();
3184 	nodelay(v->window, TRUE);
3185 	if (ret == ERR)
3186 		return NULL;
3187 
3188 	if (*pattern == '\0') {
3189 		/*
3190 		 * Safety measure for the situation where the user
3191 		 * resets limit without previously limiting anything.
3192 		 */
3193 		if (!s->limit_view)
3194 			return NULL;
3195 
3196 		/*
3197 		 * User could have pressed Ctrl+L, which refreshed the
3198 		 * commit queues, it means we can't save previously
3199 		 * (before limit took place) displayed entries,
3200 		 * because they would point to already free'ed memory,
3201 		 * so we are forced to always select first entry of
3202 		 * the queue.
3203 		 */
3204 		s->commits = &s->real_commits;
3205 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3206 		s->selected_entry = s->first_displayed_entry;
3207 		s->selected = 0;
3208 		s->limit_view = 0;
3209 
3210 		return NULL;
3211 	}
3212 
3213 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3214 		return NULL;
3215 
3216 	s->limit_view = 1;
3217 
3218 	/* Clear the screen while loading limit view */
3219 	s->first_displayed_entry = NULL;
3220 	s->last_displayed_entry = NULL;
3221 	s->selected_entry = NULL;
3222 	s->commits = &s->limit_commits;
3223 
3224 	/* Prepare limit queue for new search */
3225 	free_commits(&s->limit_commits);
3226 	s->limit_commits.ncommits = 0;
3227 
3228 	/* First process commits, which are in queue already */
3229 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3230 		int have_match = 0;
3231 
3232 		err = match_commit(&have_match, entry->id,
3233 		    entry->commit, &s->limit_regex);
3234 		if (err)
3235 			return err;
3236 
3237 		if (have_match) {
3238 			struct commit_queue_entry *matched;
3239 
3240 			matched = alloc_commit_queue_entry(entry->commit,
3241 			    entry->id);
3242 			if (matched == NULL) {
3243 				err = got_error_from_errno(
3244 				    "alloc_commit_queue_entry");
3245 				break;
3246 			}
3247 			matched->commit = entry->commit;
3248 			got_object_commit_retain(entry->commit);
3249 
3250 			matched->idx = s->limit_commits.ncommits;
3251 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3252 			    matched, entry);
3253 			s->limit_commits.ncommits++;
3254 		}
3255 	}
3256 
3257 	/* Second process all the commits, until we fill the screen */
3258 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3259 	    !s->thread_args.log_complete) {
3260 		s->thread_args.commits_needed +=
3261 		    view->nlines - s->limit_commits.ncommits - 1;
3262 		err = trigger_log_thread(view, 1);
3263 		if (err)
3264 			return err;
3265 	}
3266 
3267 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3268 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3269 	s->selected = 0;
3270 
3271 	return NULL;
3272 }
3273 
3274 static const struct got_error *
3275 search_start_log_view(struct tog_view *view)
3276 {
3277 	struct tog_log_view_state *s = &view->state.log;
3278 
3279 	s->matched_entry = NULL;
3280 	s->search_entry = NULL;
3281 	return NULL;
3282 }
3283 
3284 static const struct got_error *
3285 search_next_log_view(struct tog_view *view)
3286 {
3287 	const struct got_error *err = NULL;
3288 	struct tog_log_view_state *s = &view->state.log;
3289 	struct commit_queue_entry *entry;
3290 
3291 	/* Display progress update in log view. */
3292 	show_log_view(view);
3293 	update_panels();
3294 	doupdate();
3295 
3296 	if (s->search_entry) {
3297 		int errcode, ch;
3298 		errcode = pthread_mutex_unlock(&tog_mutex);
3299 		if (errcode)
3300 			return got_error_set_errno(errcode,
3301 			    "pthread_mutex_unlock");
3302 		ch = wgetch(view->window);
3303 		errcode = pthread_mutex_lock(&tog_mutex);
3304 		if (errcode)
3305 			return got_error_set_errno(errcode,
3306 			    "pthread_mutex_lock");
3307 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3308 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3309 			return NULL;
3310 		}
3311 		if (view->searching == TOG_SEARCH_FORWARD)
3312 			entry = TAILQ_NEXT(s->search_entry, entry);
3313 		else
3314 			entry = TAILQ_PREV(s->search_entry,
3315 			    commit_queue_head, entry);
3316 	} else if (s->matched_entry) {
3317 		/*
3318 		 * If the user has moved the cursor after we hit a match,
3319 		 * the position from where we should continue searching
3320 		 * might have changed.
3321 		 */
3322 		if (view->searching == TOG_SEARCH_FORWARD)
3323 			entry = TAILQ_NEXT(s->selected_entry, entry);
3324 		else
3325 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3326 			    entry);
3327 	} else {
3328 		entry = s->selected_entry;
3329 	}
3330 
3331 	while (1) {
3332 		int have_match = 0;
3333 
3334 		if (entry == NULL) {
3335 			if (s->thread_args.log_complete ||
3336 			    view->searching == TOG_SEARCH_BACKWARD) {
3337 				view->search_next_done =
3338 				    (s->matched_entry == NULL ?
3339 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3340 				s->search_entry = NULL;
3341 				return NULL;
3342 			}
3343 			/*
3344 			 * Poke the log thread for more commits and return,
3345 			 * allowing the main loop to make progress. Search
3346 			 * will resume at s->search_entry once we come back.
3347 			 */
3348 			s->thread_args.commits_needed++;
3349 			return trigger_log_thread(view, 0);
3350 		}
3351 
3352 		err = match_commit(&have_match, entry->id, entry->commit,
3353 		    &view->regex);
3354 		if (err)
3355 			break;
3356 		if (have_match) {
3357 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3358 			s->matched_entry = entry;
3359 			break;
3360 		}
3361 
3362 		s->search_entry = entry;
3363 		if (view->searching == TOG_SEARCH_FORWARD)
3364 			entry = TAILQ_NEXT(entry, entry);
3365 		else
3366 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3367 	}
3368 
3369 	if (s->matched_entry) {
3370 		int cur = s->selected_entry->idx;
3371 		while (cur < s->matched_entry->idx) {
3372 			err = input_log_view(NULL, view, KEY_DOWN);
3373 			if (err)
3374 				return err;
3375 			cur++;
3376 		}
3377 		while (cur > s->matched_entry->idx) {
3378 			err = input_log_view(NULL, view, KEY_UP);
3379 			if (err)
3380 				return err;
3381 			cur--;
3382 		}
3383 	}
3384 
3385 	s->search_entry = NULL;
3386 
3387 	return NULL;
3388 }
3389 
3390 static const struct got_error *
3391 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3392     struct got_repository *repo, const char *head_ref_name,
3393     const char *in_repo_path, int log_branches)
3394 {
3395 	const struct got_error *err = NULL;
3396 	struct tog_log_view_state *s = &view->state.log;
3397 	struct got_repository *thread_repo = NULL;
3398 	struct got_commit_graph *thread_graph = NULL;
3399 	int errcode;
3400 
3401 	if (in_repo_path != s->in_repo_path) {
3402 		free(s->in_repo_path);
3403 		s->in_repo_path = strdup(in_repo_path);
3404 		if (s->in_repo_path == NULL)
3405 			return got_error_from_errno("strdup");
3406 	}
3407 
3408 	/* The commit queue only contains commits being displayed. */
3409 	TAILQ_INIT(&s->real_commits.head);
3410 	s->real_commits.ncommits = 0;
3411 	s->commits = &s->real_commits;
3412 
3413 	TAILQ_INIT(&s->limit_commits.head);
3414 	s->limit_view = 0;
3415 	s->limit_commits.ncommits = 0;
3416 
3417 	s->repo = repo;
3418 	if (head_ref_name) {
3419 		s->head_ref_name = strdup(head_ref_name);
3420 		if (s->head_ref_name == NULL) {
3421 			err = got_error_from_errno("strdup");
3422 			goto done;
3423 		}
3424 	}
3425 	s->start_id = got_object_id_dup(start_id);
3426 	if (s->start_id == NULL) {
3427 		err = got_error_from_errno("got_object_id_dup");
3428 		goto done;
3429 	}
3430 	s->log_branches = log_branches;
3431 	s->use_committer = 1;
3432 
3433 	STAILQ_INIT(&s->colors);
3434 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3435 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3436 		    get_color_value("TOG_COLOR_COMMIT"));
3437 		if (err)
3438 			goto done;
3439 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3440 		    get_color_value("TOG_COLOR_AUTHOR"));
3441 		if (err) {
3442 			free_colors(&s->colors);
3443 			goto done;
3444 		}
3445 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3446 		    get_color_value("TOG_COLOR_DATE"));
3447 		if (err) {
3448 			free_colors(&s->colors);
3449 			goto done;
3450 		}
3451 	}
3452 
3453 	view->show = show_log_view;
3454 	view->input = input_log_view;
3455 	view->resize = resize_log_view;
3456 	view->close = close_log_view;
3457 	view->search_start = search_start_log_view;
3458 	view->search_next = search_next_log_view;
3459 
3460 	if (s->thread_args.pack_fds == NULL) {
3461 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3462 		if (err)
3463 			goto done;
3464 	}
3465 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3466 	    s->thread_args.pack_fds);
3467 	if (err)
3468 		goto done;
3469 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3470 	    !s->log_branches);
3471 	if (err)
3472 		goto done;
3473 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3474 	    s->repo, NULL, NULL);
3475 	if (err)
3476 		goto done;
3477 
3478 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3479 	if (errcode) {
3480 		err = got_error_set_errno(errcode, "pthread_cond_init");
3481 		goto done;
3482 	}
3483 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3484 	if (errcode) {
3485 		err = got_error_set_errno(errcode, "pthread_cond_init");
3486 		goto done;
3487 	}
3488 
3489 	s->thread_args.commits_needed = view->nlines;
3490 	s->thread_args.graph = thread_graph;
3491 	s->thread_args.real_commits = &s->real_commits;
3492 	s->thread_args.limit_commits = &s->limit_commits;
3493 	s->thread_args.in_repo_path = s->in_repo_path;
3494 	s->thread_args.start_id = s->start_id;
3495 	s->thread_args.repo = thread_repo;
3496 	s->thread_args.log_complete = 0;
3497 	s->thread_args.quit = &s->quit;
3498 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3499 	s->thread_args.selected_entry = &s->selected_entry;
3500 	s->thread_args.searching = &view->searching;
3501 	s->thread_args.search_next_done = &view->search_next_done;
3502 	s->thread_args.regex = &view->regex;
3503 	s->thread_args.limiting = &s->limit_view;
3504 	s->thread_args.limit_regex = &s->limit_regex;
3505 	s->thread_args.limit_commits = &s->limit_commits;
3506 done:
3507 	if (err)
3508 		close_log_view(view);
3509 	return err;
3510 }
3511 
3512 static const struct got_error *
3513 show_log_view(struct tog_view *view)
3514 {
3515 	const struct got_error *err;
3516 	struct tog_log_view_state *s = &view->state.log;
3517 
3518 	if (s->thread == 0) { //NULL) {
3519 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3520 		    &s->thread_args);
3521 		if (errcode)
3522 			return got_error_set_errno(errcode, "pthread_create");
3523 		if (s->thread_args.commits_needed > 0) {
3524 			err = trigger_log_thread(view, 1);
3525 			if (err)
3526 				return err;
3527 		}
3528 	}
3529 
3530 	return draw_commits(view);
3531 }
3532 
3533 static void
3534 log_move_cursor_up(struct tog_view *view, int page, int home)
3535 {
3536 	struct tog_log_view_state *s = &view->state.log;
3537 
3538 	if (s->first_displayed_entry == NULL)
3539 		return;
3540 	if (s->selected_entry->idx == 0)
3541 		view->count = 0;
3542 
3543 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3544 	    || home)
3545 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3546 
3547 	if (!page && !home && s->selected > 0)
3548 		--s->selected;
3549 	else
3550 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3551 
3552 	select_commit(s);
3553 	return;
3554 }
3555 
3556 static const struct got_error *
3557 log_move_cursor_down(struct tog_view *view, int page)
3558 {
3559 	struct tog_log_view_state	*s = &view->state.log;
3560 	const struct got_error		*err = NULL;
3561 	int				 eos = view->nlines - 2;
3562 
3563 	if (s->first_displayed_entry == NULL)
3564 		return NULL;
3565 
3566 	if (s->thread_args.log_complete &&
3567 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3568 		return NULL;
3569 
3570 	if (view_is_hsplit_top(view))
3571 		--eos;  /* border consumes the last line */
3572 
3573 	if (!page) {
3574 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3575 			++s->selected;
3576 		else
3577 			err = log_scroll_down(view, 1);
3578 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3579 		struct commit_queue_entry *entry;
3580 		int n;
3581 
3582 		s->selected = 0;
3583 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3584 		s->last_displayed_entry = entry;
3585 		for (n = 0; n <= eos; n++) {
3586 			if (entry == NULL)
3587 				break;
3588 			s->first_displayed_entry = entry;
3589 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3590 		}
3591 		if (n > 0)
3592 			s->selected = n - 1;
3593 	} else {
3594 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3595 		    s->thread_args.log_complete)
3596 			s->selected += MIN(page,
3597 			    s->commits->ncommits - s->selected_entry->idx - 1);
3598 		else
3599 			err = log_scroll_down(view, page);
3600 	}
3601 	if (err)
3602 		return err;
3603 
3604 	/*
3605 	 * We might necessarily overshoot in horizontal
3606 	 * splits; if so, select the last displayed commit.
3607 	 */
3608 	if (s->first_displayed_entry && s->last_displayed_entry) {
3609 		s->selected = MIN(s->selected,
3610 		    s->last_displayed_entry->idx -
3611 		    s->first_displayed_entry->idx);
3612 	}
3613 
3614 	select_commit(s);
3615 
3616 	if (s->thread_args.log_complete &&
3617 	    s->selected_entry->idx == s->commits->ncommits - 1)
3618 		view->count = 0;
3619 
3620 	return NULL;
3621 }
3622 
3623 static void
3624 view_get_split(struct tog_view *view, int *y, int *x)
3625 {
3626 	*x = 0;
3627 	*y = 0;
3628 
3629 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3630 		if (view->child && view->child->resized_y)
3631 			*y = view->child->resized_y;
3632 		else if (view->resized_y)
3633 			*y = view->resized_y;
3634 		else
3635 			*y = view_split_begin_y(view->lines);
3636 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3637 		if (view->child && view->child->resized_x)
3638 			*x = view->child->resized_x;
3639 		else if (view->resized_x)
3640 			*x = view->resized_x;
3641 		else
3642 			*x = view_split_begin_x(view->begin_x);
3643 	}
3644 }
3645 
3646 /* Split view horizontally at y and offset view->state->selected line. */
3647 static const struct got_error *
3648 view_init_hsplit(struct tog_view *view, int y)
3649 {
3650 	const struct got_error *err = NULL;
3651 
3652 	view->nlines = y;
3653 	view->ncols = COLS;
3654 	err = view_resize(view);
3655 	if (err)
3656 		return err;
3657 
3658 	err = offset_selection_down(view);
3659 
3660 	return err;
3661 }
3662 
3663 static const struct got_error *
3664 log_goto_line(struct tog_view *view, int nlines)
3665 {
3666 	const struct got_error		*err = NULL;
3667 	struct tog_log_view_state	*s = &view->state.log;
3668 	int				 g, idx = s->selected_entry->idx;
3669 
3670 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3671 		return NULL;
3672 
3673 	g = view->gline;
3674 	view->gline = 0;
3675 
3676 	if (g >= s->first_displayed_entry->idx + 1 &&
3677 	    g <= s->last_displayed_entry->idx + 1 &&
3678 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3679 		s->selected = g - s->first_displayed_entry->idx - 1;
3680 		select_commit(s);
3681 		return NULL;
3682 	}
3683 
3684 	if (idx + 1 < g) {
3685 		err = log_move_cursor_down(view, g - idx - 1);
3686 		if (!err && g > s->selected_entry->idx + 1)
3687 			err = log_move_cursor_down(view,
3688 			    g - s->first_displayed_entry->idx - 1);
3689 		if (err)
3690 			return err;
3691 	} else if (idx + 1 > g)
3692 		log_move_cursor_up(view, idx - g + 1, 0);
3693 
3694 	if (g < nlines && s->first_displayed_entry->idx == 0)
3695 		s->selected = g - 1;
3696 
3697 	select_commit(s);
3698 	return NULL;
3699 
3700 }
3701 
3702 static void
3703 horizontal_scroll_input(struct tog_view *view, int ch)
3704 {
3705 
3706 	switch (ch) {
3707 	case KEY_LEFT:
3708 	case 'h':
3709 		view->x -= MIN(view->x, 2);
3710 		if (view->x <= 0)
3711 			view->count = 0;
3712 		break;
3713 	case KEY_RIGHT:
3714 	case 'l':
3715 		if (view->x + view->ncols / 2 < view->maxx)
3716 			view->x += 2;
3717 		else
3718 			view->count = 0;
3719 		break;
3720 	case '0':
3721 		view->x = 0;
3722 		break;
3723 	case '$':
3724 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3725 		view->count = 0;
3726 		break;
3727 	default:
3728 		break;
3729 	}
3730 }
3731 
3732 static const struct got_error *
3733 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3734 {
3735 	const struct got_error *err = NULL;
3736 	struct tog_log_view_state *s = &view->state.log;
3737 	int eos, nscroll;
3738 
3739 	if (s->thread_args.load_all) {
3740 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3741 			s->thread_args.load_all = 0;
3742 		else if (s->thread_args.log_complete) {
3743 			err = log_move_cursor_down(view, s->commits->ncommits);
3744 			s->thread_args.load_all = 0;
3745 		}
3746 		if (err)
3747 			return err;
3748 	}
3749 
3750 	eos = nscroll = view->nlines - 1;
3751 	if (view_is_hsplit_top(view))
3752 		--eos;  /* border */
3753 
3754 	if (view->gline)
3755 		return log_goto_line(view, eos);
3756 
3757 	switch (ch) {
3758 	case '&':
3759 		err = limit_log_view(view);
3760 		break;
3761 	case 'q':
3762 		s->quit = 1;
3763 		break;
3764 	case '0':
3765 	case '$':
3766 	case KEY_RIGHT:
3767 	case 'l':
3768 	case KEY_LEFT:
3769 	case 'h':
3770 		horizontal_scroll_input(view, ch);
3771 		break;
3772 	case 'k':
3773 	case KEY_UP:
3774 	case '<':
3775 	case ',':
3776 	case CTRL('p'):
3777 		log_move_cursor_up(view, 0, 0);
3778 		break;
3779 	case 'g':
3780 	case '=':
3781 	case KEY_HOME:
3782 		log_move_cursor_up(view, 0, 1);
3783 		view->count = 0;
3784 		break;
3785 	case CTRL('u'):
3786 	case 'u':
3787 		nscroll /= 2;
3788 		/* FALL THROUGH */
3789 	case KEY_PPAGE:
3790 	case CTRL('b'):
3791 	case 'b':
3792 		log_move_cursor_up(view, nscroll, 0);
3793 		break;
3794 	case 'j':
3795 	case KEY_DOWN:
3796 	case '>':
3797 	case '.':
3798 	case CTRL('n'):
3799 		err = log_move_cursor_down(view, 0);
3800 		break;
3801 	case '@':
3802 		s->use_committer = !s->use_committer;
3803 		view->action = s->use_committer ?
3804 		    "show committer" : "show commit author";
3805 		break;
3806 	case 'G':
3807 	case '*':
3808 	case KEY_END: {
3809 		/* We don't know yet how many commits, so we're forced to
3810 		 * traverse them all. */
3811 		view->count = 0;
3812 		s->thread_args.load_all = 1;
3813 		if (!s->thread_args.log_complete)
3814 			return trigger_log_thread(view, 0);
3815 		err = log_move_cursor_down(view, s->commits->ncommits);
3816 		s->thread_args.load_all = 0;
3817 		break;
3818 	}
3819 	case CTRL('d'):
3820 	case 'd':
3821 		nscroll /= 2;
3822 		/* FALL THROUGH */
3823 	case KEY_NPAGE:
3824 	case CTRL('f'):
3825 	case 'f':
3826 	case ' ':
3827 		err = log_move_cursor_down(view, nscroll);
3828 		break;
3829 	case KEY_RESIZE:
3830 		if (s->selected > view->nlines - 2)
3831 			s->selected = view->nlines - 2;
3832 		if (s->selected > s->commits->ncommits - 1)
3833 			s->selected = s->commits->ncommits - 1;
3834 		select_commit(s);
3835 		if (s->commits->ncommits < view->nlines - 1 &&
3836 		    !s->thread_args.log_complete) {
3837 			s->thread_args.commits_needed += (view->nlines - 1) -
3838 			    s->commits->ncommits;
3839 			err = trigger_log_thread(view, 1);
3840 		}
3841 		break;
3842 	case KEY_ENTER:
3843 	case '\r':
3844 		view->count = 0;
3845 		if (s->selected_entry == NULL)
3846 			break;
3847 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3848 		break;
3849 	case 'T':
3850 		view->count = 0;
3851 		if (s->selected_entry == NULL)
3852 			break;
3853 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3854 		break;
3855 	case KEY_BACKSPACE:
3856 	case CTRL('l'):
3857 	case 'B':
3858 		view->count = 0;
3859 		if (ch == KEY_BACKSPACE &&
3860 		    got_path_is_root_dir(s->in_repo_path))
3861 			break;
3862 		err = stop_log_thread(s);
3863 		if (err)
3864 			return err;
3865 		if (ch == KEY_BACKSPACE) {
3866 			char *parent_path;
3867 			err = got_path_dirname(&parent_path, s->in_repo_path);
3868 			if (err)
3869 				return err;
3870 			free(s->in_repo_path);
3871 			s->in_repo_path = parent_path;
3872 			s->thread_args.in_repo_path = s->in_repo_path;
3873 		} else if (ch == CTRL('l')) {
3874 			struct got_object_id *start_id;
3875 			err = got_repo_match_object_id(&start_id, NULL,
3876 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3877 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3878 			if (err) {
3879 				if (s->head_ref_name == NULL ||
3880 				    err->code != GOT_ERR_NOT_REF)
3881 					return err;
3882 				/* Try to cope with deleted references. */
3883 				free(s->head_ref_name);
3884 				s->head_ref_name = NULL;
3885 				err = got_repo_match_object_id(&start_id,
3886 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3887 				    &tog_refs, s->repo);
3888 				if (err)
3889 					return err;
3890 			}
3891 			free(s->start_id);
3892 			s->start_id = start_id;
3893 			s->thread_args.start_id = s->start_id;
3894 		} else /* 'B' */
3895 			s->log_branches = !s->log_branches;
3896 
3897 		if (s->thread_args.pack_fds == NULL) {
3898 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3899 			if (err)
3900 				return err;
3901 		}
3902 		err = got_repo_open(&s->thread_args.repo,
3903 		    got_repo_get_path(s->repo), NULL,
3904 		    s->thread_args.pack_fds);
3905 		if (err)
3906 			return err;
3907 		tog_free_refs();
3908 		err = tog_load_refs(s->repo, 0);
3909 		if (err)
3910 			return err;
3911 		err = got_commit_graph_open(&s->thread_args.graph,
3912 		    s->in_repo_path, !s->log_branches);
3913 		if (err)
3914 			return err;
3915 		err = got_commit_graph_iter_start(s->thread_args.graph,
3916 		    s->start_id, s->repo, NULL, NULL);
3917 		if (err)
3918 			return err;
3919 		free_commits(&s->real_commits);
3920 		free_commits(&s->limit_commits);
3921 		s->first_displayed_entry = NULL;
3922 		s->last_displayed_entry = NULL;
3923 		s->selected_entry = NULL;
3924 		s->selected = 0;
3925 		s->thread_args.log_complete = 0;
3926 		s->quit = 0;
3927 		s->thread_args.commits_needed = view->lines;
3928 		s->matched_entry = NULL;
3929 		s->search_entry = NULL;
3930 		view->offset = 0;
3931 		break;
3932 	case 'R':
3933 		view->count = 0;
3934 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3935 		break;
3936 	default:
3937 		view->count = 0;
3938 		break;
3939 	}
3940 
3941 	return err;
3942 }
3943 
3944 static const struct got_error *
3945 apply_unveil(const char *repo_path, const char *worktree_path)
3946 {
3947 	const struct got_error *error;
3948 
3949 #ifdef PROFILE
3950 	if (unveil("gmon.out", "rwc") != 0)
3951 		return got_error_from_errno2("unveil", "gmon.out");
3952 #endif
3953 	if (repo_path && unveil(repo_path, "r") != 0)
3954 		return got_error_from_errno2("unveil", repo_path);
3955 
3956 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3957 		return got_error_from_errno2("unveil", worktree_path);
3958 
3959 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3960 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3961 
3962 	error = got_privsep_unveil_exec_helpers();
3963 	if (error != NULL)
3964 		return error;
3965 
3966 	if (unveil(NULL, NULL) != 0)
3967 		return got_error_from_errno("unveil");
3968 
3969 	return NULL;
3970 }
3971 
3972 static void
3973 init_curses(void)
3974 {
3975 	/*
3976 	 * Override default signal handlers before starting ncurses.
3977 	 * This should prevent ncurses from installing its own
3978 	 * broken cleanup() signal handler.
3979 	 */
3980 	signal(SIGWINCH, tog_sigwinch);
3981 	signal(SIGPIPE, tog_sigpipe);
3982 	signal(SIGCONT, tog_sigcont);
3983 	signal(SIGINT, tog_sigint);
3984 	signal(SIGTERM, tog_sigterm);
3985 
3986 	initscr();
3987 	cbreak();
3988 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3989 	noecho();
3990 	nonl();
3991 	intrflush(stdscr, FALSE);
3992 	keypad(stdscr, TRUE);
3993 	curs_set(0);
3994 	if (getenv("TOG_COLORS") != NULL) {
3995 		start_color();
3996 		use_default_colors();
3997 	}
3998 }
3999 
4000 static const struct got_error *
4001 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4002     struct got_repository *repo, struct got_worktree *worktree)
4003 {
4004 	const struct got_error *err = NULL;
4005 
4006 	if (argc == 0) {
4007 		*in_repo_path = strdup("/");
4008 		if (*in_repo_path == NULL)
4009 			return got_error_from_errno("strdup");
4010 		return NULL;
4011 	}
4012 
4013 	if (worktree) {
4014 		const char *prefix = got_worktree_get_path_prefix(worktree);
4015 		char *p;
4016 
4017 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4018 		if (err)
4019 			return err;
4020 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4021 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4022 		    p) == -1) {
4023 			err = got_error_from_errno("asprintf");
4024 			*in_repo_path = NULL;
4025 		}
4026 		free(p);
4027 	} else
4028 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4029 
4030 	return err;
4031 }
4032 
4033 static const struct got_error *
4034 cmd_log(int argc, char *argv[])
4035 {
4036 	const struct got_error *error;
4037 	struct got_repository *repo = NULL;
4038 	struct got_worktree *worktree = NULL;
4039 	struct got_object_id *start_id = NULL;
4040 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4041 	char *start_commit = NULL, *label = NULL;
4042 	struct got_reference *ref = NULL;
4043 	const char *head_ref_name = NULL;
4044 	int ch, log_branches = 0;
4045 	struct tog_view *view;
4046 	int *pack_fds = NULL;
4047 
4048 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4049 		switch (ch) {
4050 		case 'b':
4051 			log_branches = 1;
4052 			break;
4053 		case 'c':
4054 			start_commit = optarg;
4055 			break;
4056 		case 'r':
4057 			repo_path = realpath(optarg, NULL);
4058 			if (repo_path == NULL)
4059 				return got_error_from_errno2("realpath",
4060 				    optarg);
4061 			break;
4062 		default:
4063 			usage_log();
4064 			/* NOTREACHED */
4065 		}
4066 	}
4067 
4068 	argc -= optind;
4069 	argv += optind;
4070 
4071 	if (argc > 1)
4072 		usage_log();
4073 
4074 	error = got_repo_pack_fds_open(&pack_fds);
4075 	if (error != NULL)
4076 		goto done;
4077 
4078 	if (repo_path == NULL) {
4079 		cwd = getcwd(NULL, 0);
4080 		if (cwd == NULL)
4081 			return got_error_from_errno("getcwd");
4082 		error = got_worktree_open(&worktree, cwd);
4083 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4084 			goto done;
4085 		if (worktree)
4086 			repo_path =
4087 			    strdup(got_worktree_get_repo_path(worktree));
4088 		else
4089 			repo_path = strdup(cwd);
4090 		if (repo_path == NULL) {
4091 			error = got_error_from_errno("strdup");
4092 			goto done;
4093 		}
4094 	}
4095 
4096 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4097 	if (error != NULL)
4098 		goto done;
4099 
4100 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4101 	    repo, worktree);
4102 	if (error)
4103 		goto done;
4104 
4105 	init_curses();
4106 
4107 	error = apply_unveil(got_repo_get_path(repo),
4108 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4109 	if (error)
4110 		goto done;
4111 
4112 	/* already loaded by tog_log_with_path()? */
4113 	if (TAILQ_EMPTY(&tog_refs)) {
4114 		error = tog_load_refs(repo, 0);
4115 		if (error)
4116 			goto done;
4117 	}
4118 
4119 	if (start_commit == NULL) {
4120 		error = got_repo_match_object_id(&start_id, &label,
4121 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4122 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4123 		if (error)
4124 			goto done;
4125 		head_ref_name = label;
4126 	} else {
4127 		error = got_ref_open(&ref, repo, start_commit, 0);
4128 		if (error == NULL)
4129 			head_ref_name = got_ref_get_name(ref);
4130 		else if (error->code != GOT_ERR_NOT_REF)
4131 			goto done;
4132 		error = got_repo_match_object_id(&start_id, NULL,
4133 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4134 		if (error)
4135 			goto done;
4136 	}
4137 
4138 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4139 	if (view == NULL) {
4140 		error = got_error_from_errno("view_open");
4141 		goto done;
4142 	}
4143 	error = open_log_view(view, start_id, repo, head_ref_name,
4144 	    in_repo_path, log_branches);
4145 	if (error)
4146 		goto done;
4147 	if (worktree) {
4148 		/* Release work tree lock. */
4149 		got_worktree_close(worktree);
4150 		worktree = NULL;
4151 	}
4152 	error = view_loop(view);
4153 done:
4154 	free(in_repo_path);
4155 	free(repo_path);
4156 	free(cwd);
4157 	free(start_id);
4158 	free(label);
4159 	if (ref)
4160 		got_ref_close(ref);
4161 	if (repo) {
4162 		const struct got_error *close_err = got_repo_close(repo);
4163 		if (error == NULL)
4164 			error = close_err;
4165 	}
4166 	if (worktree)
4167 		got_worktree_close(worktree);
4168 	if (pack_fds) {
4169 		const struct got_error *pack_err =
4170 		    got_repo_pack_fds_close(pack_fds);
4171 		if (error == NULL)
4172 			error = pack_err;
4173 	}
4174 	tog_free_refs();
4175 	return error;
4176 }
4177 
4178 __dead static void
4179 usage_diff(void)
4180 {
4181 	endwin();
4182 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4183 	    "object1 object2\n", getprogname());
4184 	exit(1);
4185 }
4186 
4187 static int
4188 match_line(const char *line, regex_t *regex, size_t nmatch,
4189     regmatch_t *regmatch)
4190 {
4191 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4192 }
4193 
4194 static struct tog_color *
4195 match_color(struct tog_colors *colors, const char *line)
4196 {
4197 	struct tog_color *tc = NULL;
4198 
4199 	STAILQ_FOREACH(tc, colors, entry) {
4200 		if (match_line(line, &tc->regex, 0, NULL))
4201 			return tc;
4202 	}
4203 
4204 	return NULL;
4205 }
4206 
4207 static const struct got_error *
4208 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4209     WINDOW *window, int skipcol, regmatch_t *regmatch)
4210 {
4211 	const struct got_error *err = NULL;
4212 	char *exstr = NULL;
4213 	wchar_t *wline = NULL;
4214 	int rme, rms, n, width, scrollx;
4215 	int width0 = 0, width1 = 0, width2 = 0;
4216 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4217 
4218 	*wtotal = 0;
4219 
4220 	rms = regmatch->rm_so;
4221 	rme = regmatch->rm_eo;
4222 
4223 	err = expand_tab(&exstr, line);
4224 	if (err)
4225 		return err;
4226 
4227 	/* Split the line into 3 segments, according to match offsets. */
4228 	seg0 = strndup(exstr, rms);
4229 	if (seg0 == NULL) {
4230 		err = got_error_from_errno("strndup");
4231 		goto done;
4232 	}
4233 	seg1 = strndup(exstr + rms, rme - rms);
4234 	if (seg1 == NULL) {
4235 		err = got_error_from_errno("strndup");
4236 		goto done;
4237 	}
4238 	seg2 = strdup(exstr + rme);
4239 	if (seg2 == NULL) {
4240 		err = got_error_from_errno("strndup");
4241 		goto done;
4242 	}
4243 
4244 	/* draw up to matched token if we haven't scrolled past it */
4245 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4246 	    col_tab_align, 1);
4247 	if (err)
4248 		goto done;
4249 	n = MAX(width0 - skipcol, 0);
4250 	if (n) {
4251 		free(wline);
4252 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4253 		    wlimit, col_tab_align, 1);
4254 		if (err)
4255 			goto done;
4256 		waddwstr(window, &wline[scrollx]);
4257 		wlimit -= width;
4258 		*wtotal += width;
4259 	}
4260 
4261 	if (wlimit > 0) {
4262 		int i = 0, w = 0;
4263 		size_t wlen;
4264 
4265 		free(wline);
4266 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4267 		    col_tab_align, 1);
4268 		if (err)
4269 			goto done;
4270 		wlen = wcslen(wline);
4271 		while (i < wlen) {
4272 			width = wcwidth(wline[i]);
4273 			if (width == -1) {
4274 				/* should not happen, tabs are expanded */
4275 				err = got_error(GOT_ERR_RANGE);
4276 				goto done;
4277 			}
4278 			if (width0 + w + width > skipcol)
4279 				break;
4280 			w += width;
4281 			i++;
4282 		}
4283 		/* draw (visible part of) matched token (if scrolled into it) */
4284 		if (width1 - w > 0) {
4285 			wattron(window, A_STANDOUT);
4286 			waddwstr(window, &wline[i]);
4287 			wattroff(window, A_STANDOUT);
4288 			wlimit -= (width1 - w);
4289 			*wtotal += (width1 - w);
4290 		}
4291 	}
4292 
4293 	if (wlimit > 0) {  /* draw rest of line */
4294 		free(wline);
4295 		if (skipcol > width0 + width1) {
4296 			err = format_line(&wline, &width2, &scrollx, seg2,
4297 			    skipcol - (width0 + width1), wlimit,
4298 			    col_tab_align, 1);
4299 			if (err)
4300 				goto done;
4301 			waddwstr(window, &wline[scrollx]);
4302 		} else {
4303 			err = format_line(&wline, &width2, NULL, seg2, 0,
4304 			    wlimit, col_tab_align, 1);
4305 			if (err)
4306 				goto done;
4307 			waddwstr(window, wline);
4308 		}
4309 		*wtotal += width2;
4310 	}
4311 done:
4312 	free(wline);
4313 	free(exstr);
4314 	free(seg0);
4315 	free(seg1);
4316 	free(seg2);
4317 	return err;
4318 }
4319 
4320 static int
4321 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4322 {
4323 	FILE	*f = NULL;
4324 	int	*eof, *first, *selected;
4325 
4326 	if (view->type == TOG_VIEW_DIFF) {
4327 		struct tog_diff_view_state *s = &view->state.diff;
4328 
4329 		first = &s->first_displayed_line;
4330 		selected = first;
4331 		eof = &s->eof;
4332 		f = s->f;
4333 	} else if (view->type == TOG_VIEW_HELP) {
4334 		struct tog_help_view_state *s = &view->state.help;
4335 
4336 		first = &s->first_displayed_line;
4337 		selected = first;
4338 		eof = &s->eof;
4339 		f = s->f;
4340 	} else if (view->type == TOG_VIEW_BLAME) {
4341 		struct tog_blame_view_state *s = &view->state.blame;
4342 
4343 		first = &s->first_displayed_line;
4344 		selected = &s->selected_line;
4345 		eof = &s->eof;
4346 		f = s->blame.f;
4347 	} else
4348 		return 0;
4349 
4350 	/* Center gline in the middle of the page like vi(1). */
4351 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4352 		return 0;
4353 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4354 		rewind(f);
4355 		*eof = 0;
4356 		*first = 1;
4357 		*lineno = 0;
4358 		*nprinted = 0;
4359 		return 0;
4360 	}
4361 
4362 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4363 		view->gline : (view->nlines - 3) / 2 + 1;
4364 	view->gline = 0;
4365 
4366 	return 1;
4367 }
4368 
4369 static const struct got_error *
4370 draw_file(struct tog_view *view, const char *header)
4371 {
4372 	struct tog_diff_view_state *s = &view->state.diff;
4373 	regmatch_t *regmatch = &view->regmatch;
4374 	const struct got_error *err;
4375 	int nprinted = 0;
4376 	char *line;
4377 	size_t linesize = 0;
4378 	ssize_t linelen;
4379 	wchar_t *wline;
4380 	int width;
4381 	int max_lines = view->nlines;
4382 	int nlines = s->nlines;
4383 	off_t line_offset;
4384 
4385 	s->lineno = s->first_displayed_line - 1;
4386 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4387 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4388 		return got_error_from_errno("fseek");
4389 
4390 	werase(view->window);
4391 
4392 	if (view->gline > s->nlines - 1)
4393 		view->gline = s->nlines - 1;
4394 
4395 	if (header) {
4396 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4397 		    1 : view->gline - (view->nlines - 3) / 2 :
4398 		    s->lineno + s->selected_line;
4399 
4400 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4401 			return got_error_from_errno("asprintf");
4402 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4403 		    0, 0);
4404 		free(line);
4405 		if (err)
4406 			return err;
4407 
4408 		if (view_needs_focus_indication(view))
4409 			wstandout(view->window);
4410 		waddwstr(view->window, wline);
4411 		free(wline);
4412 		wline = NULL;
4413 		while (width++ < view->ncols)
4414 			waddch(view->window, ' ');
4415 		if (view_needs_focus_indication(view))
4416 			wstandend(view->window);
4417 
4418 		if (max_lines <= 1)
4419 			return NULL;
4420 		max_lines--;
4421 	}
4422 
4423 	s->eof = 0;
4424 	view->maxx = 0;
4425 	line = NULL;
4426 	while (max_lines > 0 && nprinted < max_lines) {
4427 		enum got_diff_line_type linetype;
4428 		attr_t attr = 0;
4429 
4430 		linelen = getline(&line, &linesize, s->f);
4431 		if (linelen == -1) {
4432 			if (feof(s->f)) {
4433 				s->eof = 1;
4434 				break;
4435 			}
4436 			free(line);
4437 			return got_ferror(s->f, GOT_ERR_IO);
4438 		}
4439 
4440 		if (++s->lineno < s->first_displayed_line)
4441 			continue;
4442 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4443 			continue;
4444 		if (s->lineno == view->hiline)
4445 			attr = A_STANDOUT;
4446 
4447 		/* Set view->maxx based on full line length. */
4448 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4449 		    view->x ? 1 : 0);
4450 		if (err) {
4451 			free(line);
4452 			return err;
4453 		}
4454 		view->maxx = MAX(view->maxx, width);
4455 		free(wline);
4456 		wline = NULL;
4457 
4458 		linetype = s->lines[s->lineno].type;
4459 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4460 		    linetype < GOT_DIFF_LINE_CONTEXT)
4461 			attr |= COLOR_PAIR(linetype);
4462 		if (attr)
4463 			wattron(view->window, attr);
4464 		if (s->first_displayed_line + nprinted == s->matched_line &&
4465 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4466 			err = add_matched_line(&width, line, view->ncols, 0,
4467 			    view->window, view->x, regmatch);
4468 			if (err) {
4469 				free(line);
4470 				return err;
4471 			}
4472 		} else {
4473 			int skip;
4474 			err = format_line(&wline, &width, &skip, line,
4475 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4476 			if (err) {
4477 				free(line);
4478 				return err;
4479 			}
4480 			waddwstr(view->window, &wline[skip]);
4481 			free(wline);
4482 			wline = NULL;
4483 		}
4484 		if (s->lineno == view->hiline) {
4485 			/* highlight full gline length */
4486 			while (width++ < view->ncols)
4487 				waddch(view->window, ' ');
4488 		} else {
4489 			if (width <= view->ncols - 1)
4490 				waddch(view->window, '\n');
4491 		}
4492 		if (attr)
4493 			wattroff(view->window, attr);
4494 		if (++nprinted == 1)
4495 			s->first_displayed_line = s->lineno;
4496 	}
4497 	free(line);
4498 	if (nprinted >= 1)
4499 		s->last_displayed_line = s->first_displayed_line +
4500 		    (nprinted - 1);
4501 	else
4502 		s->last_displayed_line = s->first_displayed_line;
4503 
4504 	view_border(view);
4505 
4506 	if (s->eof) {
4507 		while (nprinted < view->nlines) {
4508 			waddch(view->window, '\n');
4509 			nprinted++;
4510 		}
4511 
4512 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4513 		    view->ncols, 0, 0);
4514 		if (err) {
4515 			return err;
4516 		}
4517 
4518 		wstandout(view->window);
4519 		waddwstr(view->window, wline);
4520 		free(wline);
4521 		wline = NULL;
4522 		wstandend(view->window);
4523 	}
4524 
4525 	return NULL;
4526 }
4527 
4528 static char *
4529 get_datestr(time_t *time, char *datebuf)
4530 {
4531 	struct tm mytm, *tm;
4532 	char *p, *s;
4533 
4534 	tm = gmtime_r(time, &mytm);
4535 	if (tm == NULL)
4536 		return NULL;
4537 	s = asctime_r(tm, datebuf);
4538 	if (s == NULL)
4539 		return NULL;
4540 	p = strchr(s, '\n');
4541 	if (p)
4542 		*p = '\0';
4543 	return s;
4544 }
4545 
4546 static const struct got_error *
4547 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4548     off_t off, uint8_t type)
4549 {
4550 	struct got_diff_line *p;
4551 
4552 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4553 	if (p == NULL)
4554 		return got_error_from_errno("reallocarray");
4555 	*lines = p;
4556 	(*lines)[*nlines].offset = off;
4557 	(*lines)[*nlines].type = type;
4558 	(*nlines)++;
4559 
4560 	return NULL;
4561 }
4562 
4563 static const struct got_error *
4564 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4565     struct got_diff_line *s_lines, size_t s_nlines)
4566 {
4567 	struct got_diff_line	*p;
4568 	char			 buf[BUFSIZ];
4569 	size_t			 i, r;
4570 
4571 	if (fseeko(src, 0L, SEEK_SET) == -1)
4572 		return got_error_from_errno("fseeko");
4573 
4574 	for (;;) {
4575 		r = fread(buf, 1, sizeof(buf), src);
4576 		if (r == 0) {
4577 			if (ferror(src))
4578 				return got_error_from_errno("fread");
4579 			if (feof(src))
4580 				break;
4581 		}
4582 		if (fwrite(buf, 1, r, dst) != r)
4583 			return got_ferror(dst, GOT_ERR_IO);
4584 	}
4585 
4586 	/*
4587 	 * The diff driver initialises the first line at offset zero when the
4588 	 * array isn't prepopulated, skip it; we already have it in *d_lines.
4589 	 */
4590 	for (i = 1; i < s_nlines; ++i)
4591 		s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4592 
4593 	--s_nlines;
4594 
4595 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4596 	if (p == NULL) {
4597 		/* d_lines is freed in close_diff_view() */
4598 		return got_error_from_errno("reallocarray");
4599 	}
4600 
4601 	*d_lines = p;
4602 
4603 	memcpy(*d_lines + *d_nlines, s_lines + 1, s_nlines * sizeof(*s_lines));
4604 	*d_nlines += s_nlines;
4605 
4606 	return NULL;
4607 }
4608 
4609 static const struct got_error *
4610 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4611     struct got_object_id *commit_id, struct got_reflist_head *refs,
4612     struct got_repository *repo, int ignore_ws, int force_text_diff,
4613     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4614 {
4615 	const struct got_error *err = NULL;
4616 	char datebuf[26], *datestr;
4617 	struct got_commit_object *commit;
4618 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4619 	time_t committer_time;
4620 	const char *author, *committer;
4621 	char *refs_str = NULL;
4622 	struct got_pathlist_entry *pe;
4623 	off_t outoff = 0;
4624 	int n;
4625 
4626 	if (refs) {
4627 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4628 		if (err)
4629 			return err;
4630 	}
4631 
4632 	err = got_object_open_as_commit(&commit, repo, commit_id);
4633 	if (err)
4634 		return err;
4635 
4636 	err = got_object_id_str(&id_str, commit_id);
4637 	if (err) {
4638 		err = got_error_from_errno("got_object_id_str");
4639 		goto done;
4640 	}
4641 
4642 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4643 	if (err)
4644 		goto done;
4645 
4646 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4647 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4648 	if (n < 0) {
4649 		err = got_error_from_errno("fprintf");
4650 		goto done;
4651 	}
4652 	outoff += n;
4653 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4654 	if (err)
4655 		goto done;
4656 
4657 	n = fprintf(outfile, "from: %s\n",
4658 	    got_object_commit_get_author(commit));
4659 	if (n < 0) {
4660 		err = got_error_from_errno("fprintf");
4661 		goto done;
4662 	}
4663 	outoff += n;
4664 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4665 	if (err)
4666 		goto done;
4667 
4668 	author = got_object_commit_get_author(commit);
4669 	committer = got_object_commit_get_committer(commit);
4670 	if (strcmp(author, committer) != 0) {
4671 		n = fprintf(outfile, "via: %s\n", committer);
4672 		if (n < 0) {
4673 			err = got_error_from_errno("fprintf");
4674 			goto done;
4675 		}
4676 		outoff += n;
4677 		err = add_line_metadata(lines, nlines, outoff,
4678 		    GOT_DIFF_LINE_AUTHOR);
4679 		if (err)
4680 			goto done;
4681 	}
4682 	committer_time = got_object_commit_get_committer_time(commit);
4683 	datestr = get_datestr(&committer_time, datebuf);
4684 	if (datestr) {
4685 		n = fprintf(outfile, "date: %s UTC\n", datestr);
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_DATE);
4693 		if (err)
4694 			goto done;
4695 	}
4696 	if (got_object_commit_get_nparents(commit) > 1) {
4697 		const struct got_object_id_queue *parent_ids;
4698 		struct got_object_qid *qid;
4699 		int pn = 1;
4700 		parent_ids = got_object_commit_get_parent_ids(commit);
4701 		STAILQ_FOREACH(qid, parent_ids, entry) {
4702 			err = got_object_id_str(&id_str, &qid->id);
4703 			if (err)
4704 				goto done;
4705 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
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_META);
4713 			if (err)
4714 				goto done;
4715 			free(id_str);
4716 			id_str = NULL;
4717 		}
4718 	}
4719 
4720 	err = got_object_commit_get_logmsg(&logmsg, commit);
4721 	if (err)
4722 		goto done;
4723 	s = logmsg;
4724 	while ((line = strsep(&s, "\n")) != NULL) {
4725 		n = fprintf(outfile, "%s\n", line);
4726 		if (n < 0) {
4727 			err = got_error_from_errno("fprintf");
4728 			goto done;
4729 		}
4730 		outoff += n;
4731 		err = add_line_metadata(lines, nlines, outoff,
4732 		    GOT_DIFF_LINE_LOGMSG);
4733 		if (err)
4734 			goto done;
4735 	}
4736 
4737 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4738 		struct got_diff_changed_path *cp = pe->data;
4739 		int pad = dsa->max_path_len - pe->path_len + 1;
4740 
4741 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4742 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4743 		    dsa->rm_cols + 1, cp->rm);
4744 		if (n < 0) {
4745 			err = got_error_from_errno("fprintf");
4746 			goto done;
4747 		}
4748 		outoff += n;
4749 		err = add_line_metadata(lines, nlines, outoff,
4750 		    GOT_DIFF_LINE_CHANGES);
4751 		if (err)
4752 			goto done;
4753 	}
4754 
4755 	fputc('\n', outfile);
4756 	outoff++;
4757 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4758 	if (err)
4759 		goto done;
4760 
4761 	n = fprintf(outfile,
4762 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4763 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4764 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4765 	if (n < 0) {
4766 		err = got_error_from_errno("fprintf");
4767 		goto done;
4768 	}
4769 	outoff += n;
4770 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4771 	if (err)
4772 		goto done;
4773 
4774 	fputc('\n', outfile);
4775 	outoff++;
4776 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4777 done:
4778 	free(id_str);
4779 	free(logmsg);
4780 	free(refs_str);
4781 	got_object_commit_close(commit);
4782 	if (err) {
4783 		free(*lines);
4784 		*lines = NULL;
4785 		*nlines = 0;
4786 	}
4787 	return err;
4788 }
4789 
4790 static const struct got_error *
4791 create_diff(struct tog_diff_view_state *s)
4792 {
4793 	const struct got_error *err = NULL;
4794 	FILE *f = NULL, *tmp_diff_file = NULL;
4795 	int obj_type;
4796 	struct got_diff_line *lines = NULL;
4797 	struct got_pathlist_head changed_paths;
4798 
4799 	TAILQ_INIT(&changed_paths);
4800 
4801 	free(s->lines);
4802 	s->lines = malloc(sizeof(*s->lines));
4803 	if (s->lines == NULL)
4804 		return got_error_from_errno("malloc");
4805 	s->nlines = 0;
4806 
4807 	f = got_opentemp();
4808 	if (f == NULL) {
4809 		err = got_error_from_errno("got_opentemp");
4810 		goto done;
4811 	}
4812 	tmp_diff_file = got_opentemp();
4813 	if (tmp_diff_file == NULL) {
4814 		err = got_error_from_errno("got_opentemp");
4815 		goto done;
4816 	}
4817 	if (s->f && fclose(s->f) == EOF) {
4818 		err = got_error_from_errno("fclose");
4819 		goto done;
4820 	}
4821 	s->f = f;
4822 
4823 	if (s->id1)
4824 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4825 	else
4826 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4827 	if (err)
4828 		goto done;
4829 
4830 	switch (obj_type) {
4831 	case GOT_OBJ_TYPE_BLOB:
4832 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4833 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4834 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4835 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4836 		    s->f);
4837 		break;
4838 	case GOT_OBJ_TYPE_TREE:
4839 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4840 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4841 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4842 		    s->force_text_diff, NULL, s->repo, s->f);
4843 		break;
4844 	case GOT_OBJ_TYPE_COMMIT: {
4845 		const struct got_object_id_queue *parent_ids;
4846 		struct got_object_qid *pid;
4847 		struct got_commit_object *commit2;
4848 		struct got_reflist_head *refs;
4849 		size_t nlines = 0;
4850 		struct got_diffstat_cb_arg dsa = {
4851 			0, 0, 0, 0, 0, 0,
4852 			&changed_paths,
4853 			s->ignore_whitespace,
4854 			s->force_text_diff,
4855 			tog_diff_algo
4856 		};
4857 
4858 		lines = malloc(sizeof(*lines));
4859 		if (lines == NULL) {
4860 			err = got_error_from_errno("malloc");
4861 			goto done;
4862 		}
4863 
4864 		/* build diff first in tmp file then append to commit info */
4865 		err = got_diff_objects_as_commits(&lines, &nlines,
4866 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4867 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4868 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4869 		if (err)
4870 			break;
4871 
4872 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4873 		if (err)
4874 			goto done;
4875 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4876 		/* Show commit info if we're diffing to a parent/root commit. */
4877 		if (s->id1 == NULL) {
4878 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4879 			    refs, s->repo, s->ignore_whitespace,
4880 			    s->force_text_diff, &dsa, s->f);
4881 			if (err)
4882 				goto done;
4883 		} else {
4884 			parent_ids = got_object_commit_get_parent_ids(commit2);
4885 			STAILQ_FOREACH(pid, parent_ids, entry) {
4886 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4887 					err = write_commit_info(&s->lines,
4888 					    &s->nlines, s->id2, refs, s->repo,
4889 					    s->ignore_whitespace,
4890 					    s->force_text_diff, &dsa, s->f);
4891 					if (err)
4892 						goto done;
4893 					break;
4894 				}
4895 			}
4896 		}
4897 		got_object_commit_close(commit2);
4898 
4899 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4900 		    lines, nlines);
4901 		break;
4902 	}
4903 	default:
4904 		err = got_error(GOT_ERR_OBJ_TYPE);
4905 		break;
4906 	}
4907 done:
4908 	free(lines);
4909 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4910 	if (s->f && fflush(s->f) != 0 && err == NULL)
4911 		err = got_error_from_errno("fflush");
4912 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4913 		err = got_error_from_errno("fclose");
4914 	return err;
4915 }
4916 
4917 static void
4918 diff_view_indicate_progress(struct tog_view *view)
4919 {
4920 	mvwaddstr(view->window, 0, 0, "diffing...");
4921 	update_panels();
4922 	doupdate();
4923 }
4924 
4925 static const struct got_error *
4926 search_start_diff_view(struct tog_view *view)
4927 {
4928 	struct tog_diff_view_state *s = &view->state.diff;
4929 
4930 	s->matched_line = 0;
4931 	return NULL;
4932 }
4933 
4934 static void
4935 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4936     size_t *nlines, int **first, int **last, int **match, int **selected)
4937 {
4938 	struct tog_diff_view_state *s = &view->state.diff;
4939 
4940 	*f = s->f;
4941 	*nlines = s->nlines;
4942 	*line_offsets = NULL;
4943 	*match = &s->matched_line;
4944 	*first = &s->first_displayed_line;
4945 	*last = &s->last_displayed_line;
4946 	*selected = &s->selected_line;
4947 }
4948 
4949 static const struct got_error *
4950 search_next_view_match(struct tog_view *view)
4951 {
4952 	const struct got_error *err = NULL;
4953 	FILE *f;
4954 	int lineno;
4955 	char *line = NULL;
4956 	size_t linesize = 0;
4957 	ssize_t linelen;
4958 	off_t *line_offsets;
4959 	size_t nlines = 0;
4960 	int *first, *last, *match, *selected;
4961 
4962 	if (!view->search_setup)
4963 		return got_error_msg(GOT_ERR_NOT_IMPL,
4964 		    "view search not supported");
4965 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4966 	    &match, &selected);
4967 
4968 	if (!view->searching) {
4969 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4970 		return NULL;
4971 	}
4972 
4973 	if (*match) {
4974 		if (view->searching == TOG_SEARCH_FORWARD)
4975 			lineno = *match + 1;
4976 		else
4977 			lineno = *match - 1;
4978 	} else
4979 		lineno = *first - 1 + *selected;
4980 
4981 	while (1) {
4982 		off_t offset;
4983 
4984 		if (lineno <= 0 || lineno > nlines) {
4985 			if (*match == 0) {
4986 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4987 				break;
4988 			}
4989 
4990 			if (view->searching == TOG_SEARCH_FORWARD)
4991 				lineno = 1;
4992 			else
4993 				lineno = nlines;
4994 		}
4995 
4996 		offset = view->type == TOG_VIEW_DIFF ?
4997 		    view->state.diff.lines[lineno - 1].offset :
4998 		    line_offsets[lineno - 1];
4999 		if (fseeko(f, offset, SEEK_SET) != 0) {
5000 			free(line);
5001 			return got_error_from_errno("fseeko");
5002 		}
5003 		linelen = getline(&line, &linesize, f);
5004 		if (linelen != -1) {
5005 			char *exstr;
5006 			err = expand_tab(&exstr, line);
5007 			if (err)
5008 				break;
5009 			if (match_line(exstr, &view->regex, 1,
5010 			    &view->regmatch)) {
5011 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5012 				*match = lineno;
5013 				free(exstr);
5014 				break;
5015 			}
5016 			free(exstr);
5017 		}
5018 		if (view->searching == TOG_SEARCH_FORWARD)
5019 			lineno++;
5020 		else
5021 			lineno--;
5022 	}
5023 	free(line);
5024 
5025 	if (*match) {
5026 		*first = *match;
5027 		*selected = 1;
5028 	}
5029 
5030 	return err;
5031 }
5032 
5033 static const struct got_error *
5034 close_diff_view(struct tog_view *view)
5035 {
5036 	const struct got_error *err = NULL;
5037 	struct tog_diff_view_state *s = &view->state.diff;
5038 
5039 	free(s->id1);
5040 	s->id1 = NULL;
5041 	free(s->id2);
5042 	s->id2 = NULL;
5043 	if (s->f && fclose(s->f) == EOF)
5044 		err = got_error_from_errno("fclose");
5045 	s->f = NULL;
5046 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5047 		err = got_error_from_errno("fclose");
5048 	s->f1 = NULL;
5049 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5050 		err = got_error_from_errno("fclose");
5051 	s->f2 = NULL;
5052 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5053 		err = got_error_from_errno("close");
5054 	s->fd1 = -1;
5055 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5056 		err = got_error_from_errno("close");
5057 	s->fd2 = -1;
5058 	free(s->lines);
5059 	s->lines = NULL;
5060 	s->nlines = 0;
5061 	return err;
5062 }
5063 
5064 static const struct got_error *
5065 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5066     struct got_object_id *id2, const char *label1, const char *label2,
5067     int diff_context, int ignore_whitespace, int force_text_diff,
5068     struct tog_view *parent_view, struct got_repository *repo)
5069 {
5070 	const struct got_error *err;
5071 	struct tog_diff_view_state *s = &view->state.diff;
5072 
5073 	memset(s, 0, sizeof(*s));
5074 	s->fd1 = -1;
5075 	s->fd2 = -1;
5076 
5077 	if (id1 != NULL && id2 != NULL) {
5078 	    int type1, type2;
5079 	    err = got_object_get_type(&type1, repo, id1);
5080 	    if (err)
5081 		return err;
5082 	    err = got_object_get_type(&type2, repo, id2);
5083 	    if (err)
5084 		return err;
5085 
5086 	    if (type1 != type2)
5087 		return got_error(GOT_ERR_OBJ_TYPE);
5088 	}
5089 	s->first_displayed_line = 1;
5090 	s->last_displayed_line = view->nlines;
5091 	s->selected_line = 1;
5092 	s->repo = repo;
5093 	s->id1 = id1;
5094 	s->id2 = id2;
5095 	s->label1 = label1;
5096 	s->label2 = label2;
5097 
5098 	if (id1) {
5099 		s->id1 = got_object_id_dup(id1);
5100 		if (s->id1 == NULL)
5101 			return got_error_from_errno("got_object_id_dup");
5102 	} else
5103 		s->id1 = NULL;
5104 
5105 	s->id2 = got_object_id_dup(id2);
5106 	if (s->id2 == NULL) {
5107 		err = got_error_from_errno("got_object_id_dup");
5108 		goto done;
5109 	}
5110 
5111 	s->f1 = got_opentemp();
5112 	if (s->f1 == NULL) {
5113 		err = got_error_from_errno("got_opentemp");
5114 		goto done;
5115 	}
5116 
5117 	s->f2 = got_opentemp();
5118 	if (s->f2 == NULL) {
5119 		err = got_error_from_errno("got_opentemp");
5120 		goto done;
5121 	}
5122 
5123 	s->fd1 = got_opentempfd();
5124 	if (s->fd1 == -1) {
5125 		err = got_error_from_errno("got_opentempfd");
5126 		goto done;
5127 	}
5128 
5129 	s->fd2 = got_opentempfd();
5130 	if (s->fd2 == -1) {
5131 		err = got_error_from_errno("got_opentempfd");
5132 		goto done;
5133 	}
5134 
5135 	s->diff_context = diff_context;
5136 	s->ignore_whitespace = ignore_whitespace;
5137 	s->force_text_diff = force_text_diff;
5138 	s->parent_view = parent_view;
5139 	s->repo = repo;
5140 
5141 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5142 		int rc;
5143 
5144 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5145 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5146 		if (rc != ERR)
5147 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5148 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5149 		if (rc != ERR)
5150 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5151 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5152 		if (rc != ERR)
5153 			rc = init_pair(GOT_DIFF_LINE_META,
5154 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5155 		if (rc != ERR)
5156 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5157 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5158 		if (rc != ERR)
5159 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5160 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5161 		if (rc != ERR)
5162 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5163 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5164 		if (rc != ERR)
5165 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5166 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5167 		if (rc != ERR)
5168 			rc = init_pair(GOT_DIFF_LINE_DATE,
5169 			    get_color_value("TOG_COLOR_DATE"), -1);
5170 		if (rc == ERR) {
5171 			err = got_error(GOT_ERR_RANGE);
5172 			goto done;
5173 		}
5174 	}
5175 
5176 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5177 	    view_is_splitscreen(view))
5178 		show_log_view(parent_view); /* draw border */
5179 	diff_view_indicate_progress(view);
5180 
5181 	err = create_diff(s);
5182 
5183 	view->show = show_diff_view;
5184 	view->input = input_diff_view;
5185 	view->reset = reset_diff_view;
5186 	view->close = close_diff_view;
5187 	view->search_start = search_start_diff_view;
5188 	view->search_setup = search_setup_diff_view;
5189 	view->search_next = search_next_view_match;
5190 done:
5191 	if (err)
5192 		close_diff_view(view);
5193 	return err;
5194 }
5195 
5196 static const struct got_error *
5197 show_diff_view(struct tog_view *view)
5198 {
5199 	const struct got_error *err;
5200 	struct tog_diff_view_state *s = &view->state.diff;
5201 	char *id_str1 = NULL, *id_str2, *header;
5202 	const char *label1, *label2;
5203 
5204 	if (s->id1) {
5205 		err = got_object_id_str(&id_str1, s->id1);
5206 		if (err)
5207 			return err;
5208 		label1 = s->label1 ? s->label1 : id_str1;
5209 	} else
5210 		label1 = "/dev/null";
5211 
5212 	err = got_object_id_str(&id_str2, s->id2);
5213 	if (err)
5214 		return err;
5215 	label2 = s->label2 ? s->label2 : id_str2;
5216 
5217 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5218 		err = got_error_from_errno("asprintf");
5219 		free(id_str1);
5220 		free(id_str2);
5221 		return err;
5222 	}
5223 	free(id_str1);
5224 	free(id_str2);
5225 
5226 	err = draw_file(view, header);
5227 	free(header);
5228 	return err;
5229 }
5230 
5231 static const struct got_error *
5232 set_selected_commit(struct tog_diff_view_state *s,
5233     struct commit_queue_entry *entry)
5234 {
5235 	const struct got_error *err;
5236 	const struct got_object_id_queue *parent_ids;
5237 	struct got_commit_object *selected_commit;
5238 	struct got_object_qid *pid;
5239 
5240 	free(s->id2);
5241 	s->id2 = got_object_id_dup(entry->id);
5242 	if (s->id2 == NULL)
5243 		return got_error_from_errno("got_object_id_dup");
5244 
5245 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5246 	if (err)
5247 		return err;
5248 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5249 	free(s->id1);
5250 	pid = STAILQ_FIRST(parent_ids);
5251 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5252 	got_object_commit_close(selected_commit);
5253 	return NULL;
5254 }
5255 
5256 static const struct got_error *
5257 reset_diff_view(struct tog_view *view)
5258 {
5259 	struct tog_diff_view_state *s = &view->state.diff;
5260 
5261 	view->count = 0;
5262 	wclear(view->window);
5263 	s->first_displayed_line = 1;
5264 	s->last_displayed_line = view->nlines;
5265 	s->matched_line = 0;
5266 	diff_view_indicate_progress(view);
5267 	return create_diff(s);
5268 }
5269 
5270 static void
5271 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5272 {
5273 	int start, i;
5274 
5275 	i = start = s->first_displayed_line - 1;
5276 
5277 	while (s->lines[i].type != type) {
5278 		if (i == 0)
5279 			i = s->nlines - 1;
5280 		if (--i == start)
5281 			return; /* do nothing, requested type not in file */
5282 	}
5283 
5284 	s->selected_line = 1;
5285 	s->first_displayed_line = i;
5286 }
5287 
5288 static void
5289 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5290 {
5291 	int start, i;
5292 
5293 	i = start = s->first_displayed_line + 1;
5294 
5295 	while (s->lines[i].type != type) {
5296 		if (i == s->nlines - 1)
5297 			i = 0;
5298 		if (++i == start)
5299 			return; /* do nothing, requested type not in file */
5300 	}
5301 
5302 	s->selected_line = 1;
5303 	s->first_displayed_line = i;
5304 }
5305 
5306 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5307     int, int, int);
5308 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5309     int, int);
5310 
5311 static const struct got_error *
5312 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5313 {
5314 	const struct got_error *err = NULL;
5315 	struct tog_diff_view_state *s = &view->state.diff;
5316 	struct tog_log_view_state *ls;
5317 	struct commit_queue_entry *old_selected_entry;
5318 	char *line = NULL;
5319 	size_t linesize = 0;
5320 	ssize_t linelen;
5321 	int i, nscroll = view->nlines - 1, up = 0;
5322 
5323 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5324 
5325 	switch (ch) {
5326 	case '0':
5327 	case '$':
5328 	case KEY_RIGHT:
5329 	case 'l':
5330 	case KEY_LEFT:
5331 	case 'h':
5332 		horizontal_scroll_input(view, ch);
5333 		break;
5334 	case 'a':
5335 	case 'w':
5336 		if (ch == 'a') {
5337 			s->force_text_diff = !s->force_text_diff;
5338 			view->action = s->force_text_diff ?
5339 			    "force ASCII text enabled" :
5340 			    "force ASCII text disabled";
5341 		}
5342 		else if (ch == 'w') {
5343 			s->ignore_whitespace = !s->ignore_whitespace;
5344 			view->action = s->ignore_whitespace ?
5345 			    "ignore whitespace enabled" :
5346 			    "ignore whitespace disabled";
5347 		}
5348 		err = reset_diff_view(view);
5349 		break;
5350 	case 'g':
5351 	case KEY_HOME:
5352 		s->first_displayed_line = 1;
5353 		view->count = 0;
5354 		break;
5355 	case 'G':
5356 	case KEY_END:
5357 		view->count = 0;
5358 		if (s->eof)
5359 			break;
5360 
5361 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5362 		s->eof = 1;
5363 		break;
5364 	case 'k':
5365 	case KEY_UP:
5366 	case CTRL('p'):
5367 		if (s->first_displayed_line > 1)
5368 			s->first_displayed_line--;
5369 		else
5370 			view->count = 0;
5371 		break;
5372 	case CTRL('u'):
5373 	case 'u':
5374 		nscroll /= 2;
5375 		/* FALL THROUGH */
5376 	case KEY_PPAGE:
5377 	case CTRL('b'):
5378 	case 'b':
5379 		if (s->first_displayed_line == 1) {
5380 			view->count = 0;
5381 			break;
5382 		}
5383 		i = 0;
5384 		while (i++ < nscroll && s->first_displayed_line > 1)
5385 			s->first_displayed_line--;
5386 		break;
5387 	case 'j':
5388 	case KEY_DOWN:
5389 	case CTRL('n'):
5390 		if (!s->eof)
5391 			s->first_displayed_line++;
5392 		else
5393 			view->count = 0;
5394 		break;
5395 	case CTRL('d'):
5396 	case 'd':
5397 		nscroll /= 2;
5398 		/* FALL THROUGH */
5399 	case KEY_NPAGE:
5400 	case CTRL('f'):
5401 	case 'f':
5402 	case ' ':
5403 		if (s->eof) {
5404 			view->count = 0;
5405 			break;
5406 		}
5407 		i = 0;
5408 		while (!s->eof && i++ < nscroll) {
5409 			linelen = getline(&line, &linesize, s->f);
5410 			s->first_displayed_line++;
5411 			if (linelen == -1) {
5412 				if (feof(s->f)) {
5413 					s->eof = 1;
5414 				} else
5415 					err = got_ferror(s->f, GOT_ERR_IO);
5416 				break;
5417 			}
5418 		}
5419 		free(line);
5420 		break;
5421 	case '(':
5422 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5423 		break;
5424 	case ')':
5425 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5426 		break;
5427 	case '{':
5428 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5429 		break;
5430 	case '}':
5431 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5432 		break;
5433 	case '[':
5434 		if (s->diff_context > 0) {
5435 			s->diff_context--;
5436 			s->matched_line = 0;
5437 			diff_view_indicate_progress(view);
5438 			err = create_diff(s);
5439 			if (s->first_displayed_line + view->nlines - 1 >
5440 			    s->nlines) {
5441 				s->first_displayed_line = 1;
5442 				s->last_displayed_line = view->nlines;
5443 			}
5444 		} else
5445 			view->count = 0;
5446 		break;
5447 	case ']':
5448 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5449 			s->diff_context++;
5450 			s->matched_line = 0;
5451 			diff_view_indicate_progress(view);
5452 			err = create_diff(s);
5453 		} else
5454 			view->count = 0;
5455 		break;
5456 	case '<':
5457 	case ',':
5458 	case 'K':
5459 		up = 1;
5460 		/* FALL THROUGH */
5461 	case '>':
5462 	case '.':
5463 	case 'J':
5464 		if (s->parent_view == NULL) {
5465 			view->count = 0;
5466 			break;
5467 		}
5468 		s->parent_view->count = view->count;
5469 
5470 		if (s->parent_view->type == TOG_VIEW_LOG) {
5471 			ls = &s->parent_view->state.log;
5472 			old_selected_entry = ls->selected_entry;
5473 
5474 			err = input_log_view(NULL, s->parent_view,
5475 			    up ? KEY_UP : KEY_DOWN);
5476 			if (err)
5477 				break;
5478 			view->count = s->parent_view->count;
5479 
5480 			if (old_selected_entry == ls->selected_entry)
5481 				break;
5482 
5483 			err = set_selected_commit(s, ls->selected_entry);
5484 			if (err)
5485 				break;
5486 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5487 			struct tog_blame_view_state *bs;
5488 			struct got_object_id *id, *prev_id;
5489 
5490 			bs = &s->parent_view->state.blame;
5491 			prev_id = get_annotation_for_line(bs->blame.lines,
5492 			    bs->blame.nlines, bs->last_diffed_line);
5493 
5494 			err = input_blame_view(&view, s->parent_view,
5495 			    up ? KEY_UP : KEY_DOWN);
5496 			if (err)
5497 				break;
5498 			view->count = s->parent_view->count;
5499 
5500 			if (prev_id == NULL)
5501 				break;
5502 			id = get_selected_commit_id(bs->blame.lines,
5503 			    bs->blame.nlines, bs->first_displayed_line,
5504 			    bs->selected_line);
5505 			if (id == NULL)
5506 				break;
5507 
5508 			if (!got_object_id_cmp(prev_id, id))
5509 				break;
5510 
5511 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5512 			if (err)
5513 				break;
5514 		}
5515 		s->first_displayed_line = 1;
5516 		s->last_displayed_line = view->nlines;
5517 		s->matched_line = 0;
5518 		view->x = 0;
5519 
5520 		diff_view_indicate_progress(view);
5521 		err = create_diff(s);
5522 		break;
5523 	default:
5524 		view->count = 0;
5525 		break;
5526 	}
5527 
5528 	return err;
5529 }
5530 
5531 static const struct got_error *
5532 cmd_diff(int argc, char *argv[])
5533 {
5534 	const struct got_error *error = NULL;
5535 	struct got_repository *repo = NULL;
5536 	struct got_worktree *worktree = NULL;
5537 	struct got_object_id *id1 = NULL, *id2 = NULL;
5538 	char *repo_path = NULL, *cwd = NULL;
5539 	char *id_str1 = NULL, *id_str2 = NULL;
5540 	char *label1 = NULL, *label2 = NULL;
5541 	int diff_context = 3, ignore_whitespace = 0;
5542 	int ch, force_text_diff = 0;
5543 	const char *errstr;
5544 	struct tog_view *view;
5545 	int *pack_fds = NULL;
5546 
5547 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5548 		switch (ch) {
5549 		case 'a':
5550 			force_text_diff = 1;
5551 			break;
5552 		case 'C':
5553 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5554 			    &errstr);
5555 			if (errstr != NULL)
5556 				errx(1, "number of context lines is %s: %s",
5557 				    errstr, errstr);
5558 			break;
5559 		case 'r':
5560 			repo_path = realpath(optarg, NULL);
5561 			if (repo_path == NULL)
5562 				return got_error_from_errno2("realpath",
5563 				    optarg);
5564 			got_path_strip_trailing_slashes(repo_path);
5565 			break;
5566 		case 'w':
5567 			ignore_whitespace = 1;
5568 			break;
5569 		default:
5570 			usage_diff();
5571 			/* NOTREACHED */
5572 		}
5573 	}
5574 
5575 	argc -= optind;
5576 	argv += optind;
5577 
5578 	if (argc == 0) {
5579 		usage_diff(); /* TODO show local worktree changes */
5580 	} else if (argc == 2) {
5581 		id_str1 = argv[0];
5582 		id_str2 = argv[1];
5583 	} else
5584 		usage_diff();
5585 
5586 	error = got_repo_pack_fds_open(&pack_fds);
5587 	if (error)
5588 		goto done;
5589 
5590 	if (repo_path == NULL) {
5591 		cwd = getcwd(NULL, 0);
5592 		if (cwd == NULL)
5593 			return got_error_from_errno("getcwd");
5594 		error = got_worktree_open(&worktree, cwd);
5595 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5596 			goto done;
5597 		if (worktree)
5598 			repo_path =
5599 			    strdup(got_worktree_get_repo_path(worktree));
5600 		else
5601 			repo_path = strdup(cwd);
5602 		if (repo_path == NULL) {
5603 			error = got_error_from_errno("strdup");
5604 			goto done;
5605 		}
5606 	}
5607 
5608 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5609 	if (error)
5610 		goto done;
5611 
5612 	init_curses();
5613 
5614 	error = apply_unveil(got_repo_get_path(repo), NULL);
5615 	if (error)
5616 		goto done;
5617 
5618 	error = tog_load_refs(repo, 0);
5619 	if (error)
5620 		goto done;
5621 
5622 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5623 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5624 	if (error)
5625 		goto done;
5626 
5627 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5628 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5629 	if (error)
5630 		goto done;
5631 
5632 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5633 	if (view == NULL) {
5634 		error = got_error_from_errno("view_open");
5635 		goto done;
5636 	}
5637 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5638 	    ignore_whitespace, force_text_diff, NULL,  repo);
5639 	if (error)
5640 		goto done;
5641 	error = view_loop(view);
5642 done:
5643 	free(label1);
5644 	free(label2);
5645 	free(repo_path);
5646 	free(cwd);
5647 	if (repo) {
5648 		const struct got_error *close_err = got_repo_close(repo);
5649 		if (error == NULL)
5650 			error = close_err;
5651 	}
5652 	if (worktree)
5653 		got_worktree_close(worktree);
5654 	if (pack_fds) {
5655 		const struct got_error *pack_err =
5656 		    got_repo_pack_fds_close(pack_fds);
5657 		if (error == NULL)
5658 			error = pack_err;
5659 	}
5660 	tog_free_refs();
5661 	return error;
5662 }
5663 
5664 __dead static void
5665 usage_blame(void)
5666 {
5667 	endwin();
5668 	fprintf(stderr,
5669 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5670 	    getprogname());
5671 	exit(1);
5672 }
5673 
5674 struct tog_blame_line {
5675 	int annotated;
5676 	struct got_object_id *id;
5677 };
5678 
5679 static const struct got_error *
5680 draw_blame(struct tog_view *view)
5681 {
5682 	struct tog_blame_view_state *s = &view->state.blame;
5683 	struct tog_blame *blame = &s->blame;
5684 	regmatch_t *regmatch = &view->regmatch;
5685 	const struct got_error *err;
5686 	int lineno = 0, nprinted = 0;
5687 	char *line = NULL;
5688 	size_t linesize = 0;
5689 	ssize_t linelen;
5690 	wchar_t *wline;
5691 	int width;
5692 	struct tog_blame_line *blame_line;
5693 	struct got_object_id *prev_id = NULL;
5694 	char *id_str;
5695 	struct tog_color *tc;
5696 
5697 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5698 	if (err)
5699 		return err;
5700 
5701 	rewind(blame->f);
5702 	werase(view->window);
5703 
5704 	if (asprintf(&line, "commit %s", id_str) == -1) {
5705 		err = got_error_from_errno("asprintf");
5706 		free(id_str);
5707 		return err;
5708 	}
5709 
5710 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5711 	free(line);
5712 	line = NULL;
5713 	if (err)
5714 		return err;
5715 	if (view_needs_focus_indication(view))
5716 		wstandout(view->window);
5717 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5718 	if (tc)
5719 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5720 	waddwstr(view->window, wline);
5721 	while (width++ < view->ncols)
5722 		waddch(view->window, ' ');
5723 	if (tc)
5724 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5725 	if (view_needs_focus_indication(view))
5726 		wstandend(view->window);
5727 	free(wline);
5728 	wline = NULL;
5729 
5730 	if (view->gline > blame->nlines)
5731 		view->gline = blame->nlines;
5732 
5733 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5734 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5735 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5736 		free(id_str);
5737 		return got_error_from_errno("asprintf");
5738 	}
5739 	free(id_str);
5740 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5741 	free(line);
5742 	line = NULL;
5743 	if (err)
5744 		return err;
5745 	waddwstr(view->window, wline);
5746 	free(wline);
5747 	wline = NULL;
5748 	if (width < view->ncols - 1)
5749 		waddch(view->window, '\n');
5750 
5751 	s->eof = 0;
5752 	view->maxx = 0;
5753 	while (nprinted < view->nlines - 2) {
5754 		linelen = getline(&line, &linesize, blame->f);
5755 		if (linelen == -1) {
5756 			if (feof(blame->f)) {
5757 				s->eof = 1;
5758 				break;
5759 			}
5760 			free(line);
5761 			return got_ferror(blame->f, GOT_ERR_IO);
5762 		}
5763 		if (++lineno < s->first_displayed_line)
5764 			continue;
5765 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5766 			continue;
5767 
5768 		/* Set view->maxx based on full line length. */
5769 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5770 		if (err) {
5771 			free(line);
5772 			return err;
5773 		}
5774 		free(wline);
5775 		wline = NULL;
5776 		view->maxx = MAX(view->maxx, width);
5777 
5778 		if (nprinted == s->selected_line - 1)
5779 			wstandout(view->window);
5780 
5781 		if (blame->nlines > 0) {
5782 			blame_line = &blame->lines[lineno - 1];
5783 			if (blame_line->annotated && prev_id &&
5784 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5785 			    !(nprinted == s->selected_line - 1)) {
5786 				waddstr(view->window, "        ");
5787 			} else if (blame_line->annotated) {
5788 				char *id_str;
5789 				err = got_object_id_str(&id_str,
5790 				    blame_line->id);
5791 				if (err) {
5792 					free(line);
5793 					return err;
5794 				}
5795 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5796 				if (tc)
5797 					wattr_on(view->window,
5798 					    COLOR_PAIR(tc->colorpair), NULL);
5799 				wprintw(view->window, "%.8s", id_str);
5800 				if (tc)
5801 					wattr_off(view->window,
5802 					    COLOR_PAIR(tc->colorpair), NULL);
5803 				free(id_str);
5804 				prev_id = blame_line->id;
5805 			} else {
5806 				waddstr(view->window, "........");
5807 				prev_id = NULL;
5808 			}
5809 		} else {
5810 			waddstr(view->window, "........");
5811 			prev_id = NULL;
5812 		}
5813 
5814 		if (nprinted == s->selected_line - 1)
5815 			wstandend(view->window);
5816 		waddstr(view->window, " ");
5817 
5818 		if (view->ncols <= 9) {
5819 			width = 9;
5820 		} else if (s->first_displayed_line + nprinted ==
5821 		    s->matched_line &&
5822 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5823 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5824 			    view->window, view->x, regmatch);
5825 			if (err) {
5826 				free(line);
5827 				return err;
5828 			}
5829 			width += 9;
5830 		} else {
5831 			int skip;
5832 			err = format_line(&wline, &width, &skip, line,
5833 			    view->x, view->ncols - 9, 9, 1);
5834 			if (err) {
5835 				free(line);
5836 				return err;
5837 			}
5838 			waddwstr(view->window, &wline[skip]);
5839 			width += 9;
5840 			free(wline);
5841 			wline = NULL;
5842 		}
5843 
5844 		if (width <= view->ncols - 1)
5845 			waddch(view->window, '\n');
5846 		if (++nprinted == 1)
5847 			s->first_displayed_line = lineno;
5848 	}
5849 	free(line);
5850 	s->last_displayed_line = lineno;
5851 
5852 	view_border(view);
5853 
5854 	return NULL;
5855 }
5856 
5857 static const struct got_error *
5858 blame_cb(void *arg, int nlines, int lineno,
5859     struct got_commit_object *commit, struct got_object_id *id)
5860 {
5861 	const struct got_error *err = NULL;
5862 	struct tog_blame_cb_args *a = arg;
5863 	struct tog_blame_line *line;
5864 	int errcode;
5865 
5866 	if (nlines != a->nlines ||
5867 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5868 		return got_error(GOT_ERR_RANGE);
5869 
5870 	errcode = pthread_mutex_lock(&tog_mutex);
5871 	if (errcode)
5872 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5873 
5874 	if (*a->quit) {	/* user has quit the blame view */
5875 		err = got_error(GOT_ERR_ITER_COMPLETED);
5876 		goto done;
5877 	}
5878 
5879 	if (lineno == -1)
5880 		goto done; /* no change in this commit */
5881 
5882 	line = &a->lines[lineno - 1];
5883 	if (line->annotated)
5884 		goto done;
5885 
5886 	line->id = got_object_id_dup(id);
5887 	if (line->id == NULL) {
5888 		err = got_error_from_errno("got_object_id_dup");
5889 		goto done;
5890 	}
5891 	line->annotated = 1;
5892 done:
5893 	errcode = pthread_mutex_unlock(&tog_mutex);
5894 	if (errcode)
5895 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5896 	return err;
5897 }
5898 
5899 static void *
5900 blame_thread(void *arg)
5901 {
5902 	const struct got_error *err, *close_err;
5903 	struct tog_blame_thread_args *ta = arg;
5904 	struct tog_blame_cb_args *a = ta->cb_args;
5905 	int errcode, fd1 = -1, fd2 = -1;
5906 	FILE *f1 = NULL, *f2 = NULL;
5907 
5908 	fd1 = got_opentempfd();
5909 	if (fd1 == -1)
5910 		return (void *)got_error_from_errno("got_opentempfd");
5911 
5912 	fd2 = got_opentempfd();
5913 	if (fd2 == -1) {
5914 		err = got_error_from_errno("got_opentempfd");
5915 		goto done;
5916 	}
5917 
5918 	f1 = got_opentemp();
5919 	if (f1 == NULL) {
5920 		err = (void *)got_error_from_errno("got_opentemp");
5921 		goto done;
5922 	}
5923 	f2 = got_opentemp();
5924 	if (f2 == NULL) {
5925 		err = (void *)got_error_from_errno("got_opentemp");
5926 		goto done;
5927 	}
5928 
5929 	err = block_signals_used_by_main_thread();
5930 	if (err)
5931 		goto done;
5932 
5933 	err = got_blame(ta->path, a->commit_id, ta->repo,
5934 	    tog_diff_algo, blame_cb, ta->cb_args,
5935 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5936 	if (err && err->code == GOT_ERR_CANCELLED)
5937 		err = NULL;
5938 
5939 	errcode = pthread_mutex_lock(&tog_mutex);
5940 	if (errcode) {
5941 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5942 		goto done;
5943 	}
5944 
5945 	close_err = got_repo_close(ta->repo);
5946 	if (err == NULL)
5947 		err = close_err;
5948 	ta->repo = NULL;
5949 	*ta->complete = 1;
5950 
5951 	errcode = pthread_mutex_unlock(&tog_mutex);
5952 	if (errcode && err == NULL)
5953 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5954 
5955 done:
5956 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5957 		err = got_error_from_errno("close");
5958 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5959 		err = got_error_from_errno("close");
5960 	if (f1 && fclose(f1) == EOF && err == NULL)
5961 		err = got_error_from_errno("fclose");
5962 	if (f2 && fclose(f2) == EOF && err == NULL)
5963 		err = got_error_from_errno("fclose");
5964 
5965 	return (void *)err;
5966 }
5967 
5968 static struct got_object_id *
5969 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5970     int first_displayed_line, int selected_line)
5971 {
5972 	struct tog_blame_line *line;
5973 
5974 	if (nlines <= 0)
5975 		return NULL;
5976 
5977 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5978 	if (!line->annotated)
5979 		return NULL;
5980 
5981 	return line->id;
5982 }
5983 
5984 static struct got_object_id *
5985 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5986     int lineno)
5987 {
5988 	struct tog_blame_line *line;
5989 
5990 	if (nlines <= 0 || lineno >= nlines)
5991 		return NULL;
5992 
5993 	line = &lines[lineno - 1];
5994 	if (!line->annotated)
5995 		return NULL;
5996 
5997 	return line->id;
5998 }
5999 
6000 static const struct got_error *
6001 stop_blame(struct tog_blame *blame)
6002 {
6003 	const struct got_error *err = NULL;
6004 	int i;
6005 
6006 	if (blame->thread) {
6007 		int errcode;
6008 		errcode = pthread_mutex_unlock(&tog_mutex);
6009 		if (errcode)
6010 			return got_error_set_errno(errcode,
6011 			    "pthread_mutex_unlock");
6012 		errcode = pthread_join(blame->thread, (void **)&err);
6013 		if (errcode)
6014 			return got_error_set_errno(errcode, "pthread_join");
6015 		errcode = pthread_mutex_lock(&tog_mutex);
6016 		if (errcode)
6017 			return got_error_set_errno(errcode,
6018 			    "pthread_mutex_lock");
6019 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6020 			err = NULL;
6021 		blame->thread = 0; //NULL;
6022 	}
6023 	if (blame->thread_args.repo) {
6024 		const struct got_error *close_err;
6025 		close_err = got_repo_close(blame->thread_args.repo);
6026 		if (err == NULL)
6027 			err = close_err;
6028 		blame->thread_args.repo = NULL;
6029 	}
6030 	if (blame->f) {
6031 		if (fclose(blame->f) == EOF && err == NULL)
6032 			err = got_error_from_errno("fclose");
6033 		blame->f = NULL;
6034 	}
6035 	if (blame->lines) {
6036 		for (i = 0; i < blame->nlines; i++)
6037 			free(blame->lines[i].id);
6038 		free(blame->lines);
6039 		blame->lines = NULL;
6040 	}
6041 	free(blame->cb_args.commit_id);
6042 	blame->cb_args.commit_id = NULL;
6043 	if (blame->pack_fds) {
6044 		const struct got_error *pack_err =
6045 		    got_repo_pack_fds_close(blame->pack_fds);
6046 		if (err == NULL)
6047 			err = pack_err;
6048 		blame->pack_fds = NULL;
6049 	}
6050 	return err;
6051 }
6052 
6053 static const struct got_error *
6054 cancel_blame_view(void *arg)
6055 {
6056 	const struct got_error *err = NULL;
6057 	int *done = arg;
6058 	int errcode;
6059 
6060 	errcode = pthread_mutex_lock(&tog_mutex);
6061 	if (errcode)
6062 		return got_error_set_errno(errcode,
6063 		    "pthread_mutex_unlock");
6064 
6065 	if (*done)
6066 		err = got_error(GOT_ERR_CANCELLED);
6067 
6068 	errcode = pthread_mutex_unlock(&tog_mutex);
6069 	if (errcode)
6070 		return got_error_set_errno(errcode,
6071 		    "pthread_mutex_lock");
6072 
6073 	return err;
6074 }
6075 
6076 static const struct got_error *
6077 run_blame(struct tog_view *view)
6078 {
6079 	struct tog_blame_view_state *s = &view->state.blame;
6080 	struct tog_blame *blame = &s->blame;
6081 	const struct got_error *err = NULL;
6082 	struct got_commit_object *commit = NULL;
6083 	struct got_blob_object *blob = NULL;
6084 	struct got_repository *thread_repo = NULL;
6085 	struct got_object_id *obj_id = NULL;
6086 	int obj_type, fd = -1;
6087 	int *pack_fds = NULL;
6088 
6089 	err = got_object_open_as_commit(&commit, s->repo,
6090 	    &s->blamed_commit->id);
6091 	if (err)
6092 		return err;
6093 
6094 	fd = got_opentempfd();
6095 	if (fd == -1) {
6096 		err = got_error_from_errno("got_opentempfd");
6097 		goto done;
6098 	}
6099 
6100 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6101 	if (err)
6102 		goto done;
6103 
6104 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6105 	if (err)
6106 		goto done;
6107 
6108 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6109 		err = got_error(GOT_ERR_OBJ_TYPE);
6110 		goto done;
6111 	}
6112 
6113 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6114 	if (err)
6115 		goto done;
6116 	blame->f = got_opentemp();
6117 	if (blame->f == NULL) {
6118 		err = got_error_from_errno("got_opentemp");
6119 		goto done;
6120 	}
6121 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6122 	    &blame->line_offsets, blame->f, blob);
6123 	if (err)
6124 		goto done;
6125 	if (blame->nlines == 0) {
6126 		s->blame_complete = 1;
6127 		goto done;
6128 	}
6129 
6130 	/* Don't include \n at EOF in the blame line count. */
6131 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6132 		blame->nlines--;
6133 
6134 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6135 	if (blame->lines == NULL) {
6136 		err = got_error_from_errno("calloc");
6137 		goto done;
6138 	}
6139 
6140 	err = got_repo_pack_fds_open(&pack_fds);
6141 	if (err)
6142 		goto done;
6143 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6144 	    pack_fds);
6145 	if (err)
6146 		goto done;
6147 
6148 	blame->pack_fds = pack_fds;
6149 	blame->cb_args.view = view;
6150 	blame->cb_args.lines = blame->lines;
6151 	blame->cb_args.nlines = blame->nlines;
6152 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6153 	if (blame->cb_args.commit_id == NULL) {
6154 		err = got_error_from_errno("got_object_id_dup");
6155 		goto done;
6156 	}
6157 	blame->cb_args.quit = &s->done;
6158 
6159 	blame->thread_args.path = s->path;
6160 	blame->thread_args.repo = thread_repo;
6161 	blame->thread_args.cb_args = &blame->cb_args;
6162 	blame->thread_args.complete = &s->blame_complete;
6163 	blame->thread_args.cancel_cb = cancel_blame_view;
6164 	blame->thread_args.cancel_arg = &s->done;
6165 	s->blame_complete = 0;
6166 
6167 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6168 		s->first_displayed_line = 1;
6169 		s->last_displayed_line = view->nlines;
6170 		s->selected_line = 1;
6171 	}
6172 	s->matched_line = 0;
6173 
6174 done:
6175 	if (commit)
6176 		got_object_commit_close(commit);
6177 	if (fd != -1 && close(fd) == -1 && err == NULL)
6178 		err = got_error_from_errno("close");
6179 	if (blob)
6180 		got_object_blob_close(blob);
6181 	free(obj_id);
6182 	if (err)
6183 		stop_blame(blame);
6184 	return err;
6185 }
6186 
6187 static const struct got_error *
6188 open_blame_view(struct tog_view *view, char *path,
6189     struct got_object_id *commit_id, struct got_repository *repo)
6190 {
6191 	const struct got_error *err = NULL;
6192 	struct tog_blame_view_state *s = &view->state.blame;
6193 
6194 	STAILQ_INIT(&s->blamed_commits);
6195 
6196 	s->path = strdup(path);
6197 	if (s->path == NULL)
6198 		return got_error_from_errno("strdup");
6199 
6200 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6201 	if (err) {
6202 		free(s->path);
6203 		return err;
6204 	}
6205 
6206 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6207 	s->first_displayed_line = 1;
6208 	s->last_displayed_line = view->nlines;
6209 	s->selected_line = 1;
6210 	s->blame_complete = 0;
6211 	s->repo = repo;
6212 	s->commit_id = commit_id;
6213 	memset(&s->blame, 0, sizeof(s->blame));
6214 
6215 	STAILQ_INIT(&s->colors);
6216 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6217 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6218 		    get_color_value("TOG_COLOR_COMMIT"));
6219 		if (err)
6220 			return err;
6221 	}
6222 
6223 	view->show = show_blame_view;
6224 	view->input = input_blame_view;
6225 	view->reset = reset_blame_view;
6226 	view->close = close_blame_view;
6227 	view->search_start = search_start_blame_view;
6228 	view->search_setup = search_setup_blame_view;
6229 	view->search_next = search_next_view_match;
6230 
6231 	return run_blame(view);
6232 }
6233 
6234 static const struct got_error *
6235 close_blame_view(struct tog_view *view)
6236 {
6237 	const struct got_error *err = NULL;
6238 	struct tog_blame_view_state *s = &view->state.blame;
6239 
6240 	if (s->blame.thread)
6241 		err = stop_blame(&s->blame);
6242 
6243 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6244 		struct got_object_qid *blamed_commit;
6245 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6246 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6247 		got_object_qid_free(blamed_commit);
6248 	}
6249 
6250 	free(s->path);
6251 	free_colors(&s->colors);
6252 	return err;
6253 }
6254 
6255 static const struct got_error *
6256 search_start_blame_view(struct tog_view *view)
6257 {
6258 	struct tog_blame_view_state *s = &view->state.blame;
6259 
6260 	s->matched_line = 0;
6261 	return NULL;
6262 }
6263 
6264 static void
6265 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6266     size_t *nlines, int **first, int **last, int **match, int **selected)
6267 {
6268 	struct tog_blame_view_state *s = &view->state.blame;
6269 
6270 	*f = s->blame.f;
6271 	*nlines = s->blame.nlines;
6272 	*line_offsets = s->blame.line_offsets;
6273 	*match = &s->matched_line;
6274 	*first = &s->first_displayed_line;
6275 	*last = &s->last_displayed_line;
6276 	*selected = &s->selected_line;
6277 }
6278 
6279 static const struct got_error *
6280 show_blame_view(struct tog_view *view)
6281 {
6282 	const struct got_error *err = NULL;
6283 	struct tog_blame_view_state *s = &view->state.blame;
6284 	int errcode;
6285 
6286 	if (s->blame.thread == 0 && !s->blame_complete) {
6287 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6288 		    &s->blame.thread_args);
6289 		if (errcode)
6290 			return got_error_set_errno(errcode, "pthread_create");
6291 
6292 		halfdelay(1); /* fast refresh while annotating  */
6293 	}
6294 
6295 	if (s->blame_complete)
6296 		halfdelay(10); /* disable fast refresh */
6297 
6298 	err = draw_blame(view);
6299 
6300 	view_border(view);
6301 	return err;
6302 }
6303 
6304 static const struct got_error *
6305 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6306     struct got_repository *repo, struct got_object_id *id)
6307 {
6308 	struct tog_view		*log_view;
6309 	const struct got_error	*err = NULL;
6310 
6311 	*new_view = NULL;
6312 
6313 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6314 	if (log_view == NULL)
6315 		return got_error_from_errno("view_open");
6316 
6317 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6318 	if (err)
6319 		view_close(log_view);
6320 	else
6321 		*new_view = log_view;
6322 
6323 	return err;
6324 }
6325 
6326 static const struct got_error *
6327 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6328 {
6329 	const struct got_error *err = NULL, *thread_err = NULL;
6330 	struct tog_view *diff_view;
6331 	struct tog_blame_view_state *s = &view->state.blame;
6332 	int eos, nscroll, begin_y = 0, begin_x = 0;
6333 
6334 	eos = nscroll = view->nlines - 2;
6335 	if (view_is_hsplit_top(view))
6336 		--eos;  /* border */
6337 
6338 	switch (ch) {
6339 	case '0':
6340 	case '$':
6341 	case KEY_RIGHT:
6342 	case 'l':
6343 	case KEY_LEFT:
6344 	case 'h':
6345 		horizontal_scroll_input(view, ch);
6346 		break;
6347 	case 'q':
6348 		s->done = 1;
6349 		break;
6350 	case 'g':
6351 	case KEY_HOME:
6352 		s->selected_line = 1;
6353 		s->first_displayed_line = 1;
6354 		view->count = 0;
6355 		break;
6356 	case 'G':
6357 	case KEY_END:
6358 		if (s->blame.nlines < eos) {
6359 			s->selected_line = s->blame.nlines;
6360 			s->first_displayed_line = 1;
6361 		} else {
6362 			s->selected_line = eos;
6363 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6364 		}
6365 		view->count = 0;
6366 		break;
6367 	case 'k':
6368 	case KEY_UP:
6369 	case CTRL('p'):
6370 		if (s->selected_line > 1)
6371 			s->selected_line--;
6372 		else if (s->selected_line == 1 &&
6373 		    s->first_displayed_line > 1)
6374 			s->first_displayed_line--;
6375 		else
6376 			view->count = 0;
6377 		break;
6378 	case CTRL('u'):
6379 	case 'u':
6380 		nscroll /= 2;
6381 		/* FALL THROUGH */
6382 	case KEY_PPAGE:
6383 	case CTRL('b'):
6384 	case 'b':
6385 		if (s->first_displayed_line == 1) {
6386 			if (view->count > 1)
6387 				nscroll += nscroll;
6388 			s->selected_line = MAX(1, s->selected_line - nscroll);
6389 			view->count = 0;
6390 			break;
6391 		}
6392 		if (s->first_displayed_line > nscroll)
6393 			s->first_displayed_line -= nscroll;
6394 		else
6395 			s->first_displayed_line = 1;
6396 		break;
6397 	case 'j':
6398 	case KEY_DOWN:
6399 	case CTRL('n'):
6400 		if (s->selected_line < eos && s->first_displayed_line +
6401 		    s->selected_line <= s->blame.nlines)
6402 			s->selected_line++;
6403 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6404 			s->first_displayed_line++;
6405 		else
6406 			view->count = 0;
6407 		break;
6408 	case 'c':
6409 	case 'p': {
6410 		struct got_object_id *id = NULL;
6411 
6412 		view->count = 0;
6413 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6414 		    s->first_displayed_line, s->selected_line);
6415 		if (id == NULL)
6416 			break;
6417 		if (ch == 'p') {
6418 			struct got_commit_object *commit, *pcommit;
6419 			struct got_object_qid *pid;
6420 			struct got_object_id *blob_id = NULL;
6421 			int obj_type;
6422 			err = got_object_open_as_commit(&commit,
6423 			    s->repo, id);
6424 			if (err)
6425 				break;
6426 			pid = STAILQ_FIRST(
6427 			    got_object_commit_get_parent_ids(commit));
6428 			if (pid == NULL) {
6429 				got_object_commit_close(commit);
6430 				break;
6431 			}
6432 			/* Check if path history ends here. */
6433 			err = got_object_open_as_commit(&pcommit,
6434 			    s->repo, &pid->id);
6435 			if (err)
6436 				break;
6437 			err = got_object_id_by_path(&blob_id, s->repo,
6438 			    pcommit, s->path);
6439 			got_object_commit_close(pcommit);
6440 			if (err) {
6441 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6442 					err = NULL;
6443 				got_object_commit_close(commit);
6444 				break;
6445 			}
6446 			err = got_object_get_type(&obj_type, s->repo,
6447 			    blob_id);
6448 			free(blob_id);
6449 			/* Can't blame non-blob type objects. */
6450 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6451 				got_object_commit_close(commit);
6452 				break;
6453 			}
6454 			err = got_object_qid_alloc(&s->blamed_commit,
6455 			    &pid->id);
6456 			got_object_commit_close(commit);
6457 		} else {
6458 			if (got_object_id_cmp(id,
6459 			    &s->blamed_commit->id) == 0)
6460 				break;
6461 			err = got_object_qid_alloc(&s->blamed_commit,
6462 			    id);
6463 		}
6464 		if (err)
6465 			break;
6466 		s->done = 1;
6467 		thread_err = stop_blame(&s->blame);
6468 		s->done = 0;
6469 		if (thread_err)
6470 			break;
6471 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6472 		    s->blamed_commit, entry);
6473 		err = run_blame(view);
6474 		if (err)
6475 			break;
6476 		break;
6477 	}
6478 	case 'C': {
6479 		struct got_object_qid *first;
6480 
6481 		view->count = 0;
6482 		first = STAILQ_FIRST(&s->blamed_commits);
6483 		if (!got_object_id_cmp(&first->id, s->commit_id))
6484 			break;
6485 		s->done = 1;
6486 		thread_err = stop_blame(&s->blame);
6487 		s->done = 0;
6488 		if (thread_err)
6489 			break;
6490 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6491 		got_object_qid_free(s->blamed_commit);
6492 		s->blamed_commit =
6493 		    STAILQ_FIRST(&s->blamed_commits);
6494 		err = run_blame(view);
6495 		if (err)
6496 			break;
6497 		break;
6498 	}
6499 	case 'L':
6500 		view->count = 0;
6501 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6502 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6503 		if (s->id_to_log)
6504 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6505 		break;
6506 	case KEY_ENTER:
6507 	case '\r': {
6508 		struct got_object_id *id = NULL;
6509 		struct got_object_qid *pid;
6510 		struct got_commit_object *commit = NULL;
6511 
6512 		view->count = 0;
6513 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6514 		    s->first_displayed_line, s->selected_line);
6515 		if (id == NULL)
6516 			break;
6517 		err = got_object_open_as_commit(&commit, s->repo, id);
6518 		if (err)
6519 			break;
6520 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6521 		if (*new_view) {
6522 			/* traversed from diff view, release diff resources  */
6523 			err = close_diff_view(*new_view);
6524 			if (err)
6525 				break;
6526 			diff_view = *new_view;
6527 		} else {
6528 			if (view_is_parent_view(view))
6529 				view_get_split(view, &begin_y, &begin_x);
6530 
6531 			diff_view = view_open(0, 0, begin_y, begin_x,
6532 			    TOG_VIEW_DIFF);
6533 			if (diff_view == NULL) {
6534 				got_object_commit_close(commit);
6535 				err = got_error_from_errno("view_open");
6536 				break;
6537 			}
6538 		}
6539 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6540 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6541 		got_object_commit_close(commit);
6542 		if (err) {
6543 			view_close(diff_view);
6544 			break;
6545 		}
6546 		s->last_diffed_line = s->first_displayed_line - 1 +
6547 		    s->selected_line;
6548 		if (*new_view)
6549 			break;	/* still open from active diff view */
6550 		if (view_is_parent_view(view) &&
6551 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6552 			err = view_init_hsplit(view, begin_y);
6553 			if (err)
6554 				break;
6555 		}
6556 
6557 		view->focussed = 0;
6558 		diff_view->focussed = 1;
6559 		diff_view->mode = view->mode;
6560 		diff_view->nlines = view->lines - begin_y;
6561 		if (view_is_parent_view(view)) {
6562 			view_transfer_size(diff_view, view);
6563 			err = view_close_child(view);
6564 			if (err)
6565 				break;
6566 			err = view_set_child(view, diff_view);
6567 			if (err)
6568 				break;
6569 			view->focus_child = 1;
6570 		} else
6571 			*new_view = diff_view;
6572 		if (err)
6573 			break;
6574 		break;
6575 	}
6576 	case CTRL('d'):
6577 	case 'd':
6578 		nscroll /= 2;
6579 		/* FALL THROUGH */
6580 	case KEY_NPAGE:
6581 	case CTRL('f'):
6582 	case 'f':
6583 	case ' ':
6584 		if (s->last_displayed_line >= s->blame.nlines &&
6585 		    s->selected_line >= MIN(s->blame.nlines,
6586 		    view->nlines - 2)) {
6587 			view->count = 0;
6588 			break;
6589 		}
6590 		if (s->last_displayed_line >= s->blame.nlines &&
6591 		    s->selected_line < view->nlines - 2) {
6592 			s->selected_line +=
6593 			    MIN(nscroll, s->last_displayed_line -
6594 			    s->first_displayed_line - s->selected_line + 1);
6595 		}
6596 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6597 			s->first_displayed_line += nscroll;
6598 		else
6599 			s->first_displayed_line =
6600 			    s->blame.nlines - (view->nlines - 3);
6601 		break;
6602 	case KEY_RESIZE:
6603 		if (s->selected_line > view->nlines - 2) {
6604 			s->selected_line = MIN(s->blame.nlines,
6605 			    view->nlines - 2);
6606 		}
6607 		break;
6608 	default:
6609 		view->count = 0;
6610 		break;
6611 	}
6612 	return thread_err ? thread_err : err;
6613 }
6614 
6615 static const struct got_error *
6616 reset_blame_view(struct tog_view *view)
6617 {
6618 	const struct got_error *err;
6619 	struct tog_blame_view_state *s = &view->state.blame;
6620 
6621 	view->count = 0;
6622 	s->done = 1;
6623 	err = stop_blame(&s->blame);
6624 	s->done = 0;
6625 	if (err)
6626 		return err;
6627 	return run_blame(view);
6628 }
6629 
6630 static const struct got_error *
6631 cmd_blame(int argc, char *argv[])
6632 {
6633 	const struct got_error *error;
6634 	struct got_repository *repo = NULL;
6635 	struct got_worktree *worktree = NULL;
6636 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6637 	char *link_target = NULL;
6638 	struct got_object_id *commit_id = NULL;
6639 	struct got_commit_object *commit = NULL;
6640 	char *commit_id_str = NULL;
6641 	int ch;
6642 	struct tog_view *view;
6643 	int *pack_fds = NULL;
6644 
6645 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6646 		switch (ch) {
6647 		case 'c':
6648 			commit_id_str = optarg;
6649 			break;
6650 		case 'r':
6651 			repo_path = realpath(optarg, NULL);
6652 			if (repo_path == NULL)
6653 				return got_error_from_errno2("realpath",
6654 				    optarg);
6655 			break;
6656 		default:
6657 			usage_blame();
6658 			/* NOTREACHED */
6659 		}
6660 	}
6661 
6662 	argc -= optind;
6663 	argv += optind;
6664 
6665 	if (argc != 1)
6666 		usage_blame();
6667 
6668 	error = got_repo_pack_fds_open(&pack_fds);
6669 	if (error != NULL)
6670 		goto done;
6671 
6672 	if (repo_path == NULL) {
6673 		cwd = getcwd(NULL, 0);
6674 		if (cwd == NULL)
6675 			return got_error_from_errno("getcwd");
6676 		error = got_worktree_open(&worktree, cwd);
6677 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6678 			goto done;
6679 		if (worktree)
6680 			repo_path =
6681 			    strdup(got_worktree_get_repo_path(worktree));
6682 		else
6683 			repo_path = strdup(cwd);
6684 		if (repo_path == NULL) {
6685 			error = got_error_from_errno("strdup");
6686 			goto done;
6687 		}
6688 	}
6689 
6690 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6691 	if (error != NULL)
6692 		goto done;
6693 
6694 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6695 	    worktree);
6696 	if (error)
6697 		goto done;
6698 
6699 	init_curses();
6700 
6701 	error = apply_unveil(got_repo_get_path(repo), NULL);
6702 	if (error)
6703 		goto done;
6704 
6705 	error = tog_load_refs(repo, 0);
6706 	if (error)
6707 		goto done;
6708 
6709 	if (commit_id_str == NULL) {
6710 		struct got_reference *head_ref;
6711 		error = got_ref_open(&head_ref, repo, worktree ?
6712 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6713 		if (error != NULL)
6714 			goto done;
6715 		error = got_ref_resolve(&commit_id, repo, head_ref);
6716 		got_ref_close(head_ref);
6717 	} else {
6718 		error = got_repo_match_object_id(&commit_id, NULL,
6719 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6720 	}
6721 	if (error != NULL)
6722 		goto done;
6723 
6724 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6725 	if (view == NULL) {
6726 		error = got_error_from_errno("view_open");
6727 		goto done;
6728 	}
6729 
6730 	error = got_object_open_as_commit(&commit, repo, commit_id);
6731 	if (error)
6732 		goto done;
6733 
6734 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6735 	    commit, repo);
6736 	if (error)
6737 		goto done;
6738 
6739 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6740 	    commit_id, repo);
6741 	if (error)
6742 		goto done;
6743 	if (worktree) {
6744 		/* Release work tree lock. */
6745 		got_worktree_close(worktree);
6746 		worktree = NULL;
6747 	}
6748 	error = view_loop(view);
6749 done:
6750 	free(repo_path);
6751 	free(in_repo_path);
6752 	free(link_target);
6753 	free(cwd);
6754 	free(commit_id);
6755 	if (commit)
6756 		got_object_commit_close(commit);
6757 	if (worktree)
6758 		got_worktree_close(worktree);
6759 	if (repo) {
6760 		const struct got_error *close_err = got_repo_close(repo);
6761 		if (error == NULL)
6762 			error = close_err;
6763 	}
6764 	if (pack_fds) {
6765 		const struct got_error *pack_err =
6766 		    got_repo_pack_fds_close(pack_fds);
6767 		if (error == NULL)
6768 			error = pack_err;
6769 	}
6770 	tog_free_refs();
6771 	return error;
6772 }
6773 
6774 static const struct got_error *
6775 draw_tree_entries(struct tog_view *view, const char *parent_path)
6776 {
6777 	struct tog_tree_view_state *s = &view->state.tree;
6778 	const struct got_error *err = NULL;
6779 	struct got_tree_entry *te;
6780 	wchar_t *wline;
6781 	char *index = NULL;
6782 	struct tog_color *tc;
6783 	int width, n, nentries, scrollx, i = 1;
6784 	int limit = view->nlines;
6785 
6786 	s->ndisplayed = 0;
6787 	if (view_is_hsplit_top(view))
6788 		--limit;  /* border */
6789 
6790 	werase(view->window);
6791 
6792 	if (limit == 0)
6793 		return NULL;
6794 
6795 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6796 	    0, 0);
6797 	if (err)
6798 		return err;
6799 	if (view_needs_focus_indication(view))
6800 		wstandout(view->window);
6801 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6802 	if (tc)
6803 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6804 	waddwstr(view->window, wline);
6805 	free(wline);
6806 	wline = NULL;
6807 	while (width++ < view->ncols)
6808 		waddch(view->window, ' ');
6809 	if (tc)
6810 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6811 	if (view_needs_focus_indication(view))
6812 		wstandend(view->window);
6813 	if (--limit <= 0)
6814 		return NULL;
6815 
6816 	i += s->selected;
6817 	if (s->first_displayed_entry) {
6818 		i += got_tree_entry_get_index(s->first_displayed_entry);
6819 		if (s->tree != s->root)
6820 			++i;  /* account for ".." entry */
6821 	}
6822 	nentries = got_object_tree_get_nentries(s->tree);
6823 	if (asprintf(&index, "[%d/%d] %s",
6824 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6825 		return got_error_from_errno("asprintf");
6826 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6827 	free(index);
6828 	if (err)
6829 		return err;
6830 	waddwstr(view->window, wline);
6831 	free(wline);
6832 	wline = NULL;
6833 	if (width < view->ncols - 1)
6834 		waddch(view->window, '\n');
6835 	if (--limit <= 0)
6836 		return NULL;
6837 	waddch(view->window, '\n');
6838 	if (--limit <= 0)
6839 		return NULL;
6840 
6841 	if (s->first_displayed_entry == NULL) {
6842 		te = got_object_tree_get_first_entry(s->tree);
6843 		if (s->selected == 0) {
6844 			if (view->focussed)
6845 				wstandout(view->window);
6846 			s->selected_entry = NULL;
6847 		}
6848 		waddstr(view->window, "  ..\n");	/* parent directory */
6849 		if (s->selected == 0 && view->focussed)
6850 			wstandend(view->window);
6851 		s->ndisplayed++;
6852 		if (--limit <= 0)
6853 			return NULL;
6854 		n = 1;
6855 	} else {
6856 		n = 0;
6857 		te = s->first_displayed_entry;
6858 	}
6859 
6860 	view->maxx = 0;
6861 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6862 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6863 		const char *modestr = "";
6864 		mode_t mode;
6865 
6866 		te = got_object_tree_get_entry(s->tree, i);
6867 		mode = got_tree_entry_get_mode(te);
6868 
6869 		if (s->show_ids) {
6870 			err = got_object_id_str(&id_str,
6871 			    got_tree_entry_get_id(te));
6872 			if (err)
6873 				return got_error_from_errno(
6874 				    "got_object_id_str");
6875 		}
6876 		if (got_object_tree_entry_is_submodule(te))
6877 			modestr = "$";
6878 		else if (S_ISLNK(mode)) {
6879 			int i;
6880 
6881 			err = got_tree_entry_get_symlink_target(&link_target,
6882 			    te, s->repo);
6883 			if (err) {
6884 				free(id_str);
6885 				return err;
6886 			}
6887 			for (i = 0; i < strlen(link_target); i++) {
6888 				if (!isprint((unsigned char)link_target[i]))
6889 					link_target[i] = '?';
6890 			}
6891 			modestr = "@";
6892 		}
6893 		else if (S_ISDIR(mode))
6894 			modestr = "/";
6895 		else if (mode & S_IXUSR)
6896 			modestr = "*";
6897 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6898 		    got_tree_entry_get_name(te), modestr,
6899 		    link_target ? " -> ": "",
6900 		    link_target ? link_target : "") == -1) {
6901 			free(id_str);
6902 			free(link_target);
6903 			return got_error_from_errno("asprintf");
6904 		}
6905 		free(id_str);
6906 		free(link_target);
6907 
6908 		/* use full line width to determine view->maxx */
6909 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
6910 		if (err) {
6911 			free(line);
6912 			break;
6913 		}
6914 		view->maxx = MAX(view->maxx, width);
6915 		free(wline);
6916 		wline = NULL;
6917 
6918 		err = format_line(&wline, &width, &scrollx, line, view->x,
6919 		    view->ncols, 0, 0);
6920 		if (err) {
6921 			free(line);
6922 			break;
6923 		}
6924 		if (n == s->selected) {
6925 			if (view->focussed)
6926 				wstandout(view->window);
6927 			s->selected_entry = te;
6928 		}
6929 		tc = match_color(&s->colors, line);
6930 		if (tc)
6931 			wattr_on(view->window,
6932 			    COLOR_PAIR(tc->colorpair), NULL);
6933 		waddwstr(view->window, &wline[scrollx]);
6934 		if (tc)
6935 			wattr_off(view->window,
6936 			    COLOR_PAIR(tc->colorpair), NULL);
6937 		if (width < view->ncols)
6938 			waddch(view->window, '\n');
6939 		if (n == s->selected && view->focussed)
6940 			wstandend(view->window);
6941 		free(line);
6942 		free(wline);
6943 		wline = NULL;
6944 		n++;
6945 		s->ndisplayed++;
6946 		s->last_displayed_entry = te;
6947 		if (--limit <= 0)
6948 			break;
6949 	}
6950 
6951 	return err;
6952 }
6953 
6954 static void
6955 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6956 {
6957 	struct got_tree_entry *te;
6958 	int isroot = s->tree == s->root;
6959 	int i = 0;
6960 
6961 	if (s->first_displayed_entry == NULL)
6962 		return;
6963 
6964 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6965 	while (i++ < maxscroll) {
6966 		if (te == NULL) {
6967 			if (!isroot)
6968 				s->first_displayed_entry = NULL;
6969 			break;
6970 		}
6971 		s->first_displayed_entry = te;
6972 		te = got_tree_entry_get_prev(s->tree, te);
6973 	}
6974 }
6975 
6976 static const struct got_error *
6977 tree_scroll_down(struct tog_view *view, int maxscroll)
6978 {
6979 	struct tog_tree_view_state *s = &view->state.tree;
6980 	struct got_tree_entry *next, *last;
6981 	int n = 0;
6982 
6983 	if (s->first_displayed_entry)
6984 		next = got_tree_entry_get_next(s->tree,
6985 		    s->first_displayed_entry);
6986 	else
6987 		next = got_object_tree_get_first_entry(s->tree);
6988 
6989 	last = s->last_displayed_entry;
6990 	while (next && n++ < maxscroll) {
6991 		if (last) {
6992 			s->last_displayed_entry = last;
6993 			last = got_tree_entry_get_next(s->tree, last);
6994 		}
6995 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6996 			s->first_displayed_entry = next;
6997 			next = got_tree_entry_get_next(s->tree, next);
6998 		}
6999 	}
7000 
7001 	return NULL;
7002 }
7003 
7004 static const struct got_error *
7005 tree_entry_path(char **path, struct tog_parent_trees *parents,
7006     struct got_tree_entry *te)
7007 {
7008 	const struct got_error *err = NULL;
7009 	struct tog_parent_tree *pt;
7010 	size_t len = 2; /* for leading slash and NUL */
7011 
7012 	TAILQ_FOREACH(pt, parents, entry)
7013 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7014 		    + 1 /* slash */;
7015 	if (te)
7016 		len += strlen(got_tree_entry_get_name(te));
7017 
7018 	*path = calloc(1, len);
7019 	if (path == NULL)
7020 		return got_error_from_errno("calloc");
7021 
7022 	(*path)[0] = '/';
7023 	pt = TAILQ_LAST(parents, tog_parent_trees);
7024 	while (pt) {
7025 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7026 		if (strlcat(*path, name, len) >= len) {
7027 			err = got_error(GOT_ERR_NO_SPACE);
7028 			goto done;
7029 		}
7030 		if (strlcat(*path, "/", len) >= len) {
7031 			err = got_error(GOT_ERR_NO_SPACE);
7032 			goto done;
7033 		}
7034 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7035 	}
7036 	if (te) {
7037 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7038 			err = got_error(GOT_ERR_NO_SPACE);
7039 			goto done;
7040 		}
7041 	}
7042 done:
7043 	if (err) {
7044 		free(*path);
7045 		*path = NULL;
7046 	}
7047 	return err;
7048 }
7049 
7050 static const struct got_error *
7051 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7052     struct got_tree_entry *te, struct tog_parent_trees *parents,
7053     struct got_object_id *commit_id, struct got_repository *repo)
7054 {
7055 	const struct got_error *err = NULL;
7056 	char *path;
7057 	struct tog_view *blame_view;
7058 
7059 	*new_view = NULL;
7060 
7061 	err = tree_entry_path(&path, parents, te);
7062 	if (err)
7063 		return err;
7064 
7065 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7066 	if (blame_view == NULL) {
7067 		err = got_error_from_errno("view_open");
7068 		goto done;
7069 	}
7070 
7071 	err = open_blame_view(blame_view, path, commit_id, repo);
7072 	if (err) {
7073 		if (err->code == GOT_ERR_CANCELLED)
7074 			err = NULL;
7075 		view_close(blame_view);
7076 	} else
7077 		*new_view = blame_view;
7078 done:
7079 	free(path);
7080 	return err;
7081 }
7082 
7083 static const struct got_error *
7084 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7085     struct tog_tree_view_state *s)
7086 {
7087 	struct tog_view *log_view;
7088 	const struct got_error *err = NULL;
7089 	char *path;
7090 
7091 	*new_view = NULL;
7092 
7093 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7094 	if (log_view == NULL)
7095 		return got_error_from_errno("view_open");
7096 
7097 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7098 	if (err)
7099 		return err;
7100 
7101 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7102 	    path, 0);
7103 	if (err)
7104 		view_close(log_view);
7105 	else
7106 		*new_view = log_view;
7107 	free(path);
7108 	return err;
7109 }
7110 
7111 static const struct got_error *
7112 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7113     const char *head_ref_name, struct got_repository *repo)
7114 {
7115 	const struct got_error *err = NULL;
7116 	char *commit_id_str = NULL;
7117 	struct tog_tree_view_state *s = &view->state.tree;
7118 	struct got_commit_object *commit = NULL;
7119 
7120 	TAILQ_INIT(&s->parents);
7121 	STAILQ_INIT(&s->colors);
7122 
7123 	s->commit_id = got_object_id_dup(commit_id);
7124 	if (s->commit_id == NULL)
7125 		return got_error_from_errno("got_object_id_dup");
7126 
7127 	err = got_object_open_as_commit(&commit, repo, commit_id);
7128 	if (err)
7129 		goto done;
7130 
7131 	/*
7132 	 * The root is opened here and will be closed when the view is closed.
7133 	 * Any visited subtrees and their path-wise parents are opened and
7134 	 * closed on demand.
7135 	 */
7136 	err = got_object_open_as_tree(&s->root, repo,
7137 	    got_object_commit_get_tree_id(commit));
7138 	if (err)
7139 		goto done;
7140 	s->tree = s->root;
7141 
7142 	err = got_object_id_str(&commit_id_str, commit_id);
7143 	if (err != NULL)
7144 		goto done;
7145 
7146 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7147 		err = got_error_from_errno("asprintf");
7148 		goto done;
7149 	}
7150 
7151 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7152 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7153 	if (head_ref_name) {
7154 		s->head_ref_name = strdup(head_ref_name);
7155 		if (s->head_ref_name == NULL) {
7156 			err = got_error_from_errno("strdup");
7157 			goto done;
7158 		}
7159 	}
7160 	s->repo = repo;
7161 
7162 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7163 		err = add_color(&s->colors, "\\$$",
7164 		    TOG_COLOR_TREE_SUBMODULE,
7165 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7166 		if (err)
7167 			goto done;
7168 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7169 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7170 		if (err)
7171 			goto done;
7172 		err = add_color(&s->colors, "/$",
7173 		    TOG_COLOR_TREE_DIRECTORY,
7174 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7175 		if (err)
7176 			goto done;
7177 
7178 		err = add_color(&s->colors, "\\*$",
7179 		    TOG_COLOR_TREE_EXECUTABLE,
7180 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7181 		if (err)
7182 			goto done;
7183 
7184 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7185 		    get_color_value("TOG_COLOR_COMMIT"));
7186 		if (err)
7187 			goto done;
7188 	}
7189 
7190 	view->show = show_tree_view;
7191 	view->input = input_tree_view;
7192 	view->close = close_tree_view;
7193 	view->search_start = search_start_tree_view;
7194 	view->search_next = search_next_tree_view;
7195 done:
7196 	free(commit_id_str);
7197 	if (commit)
7198 		got_object_commit_close(commit);
7199 	if (err)
7200 		close_tree_view(view);
7201 	return err;
7202 }
7203 
7204 static const struct got_error *
7205 close_tree_view(struct tog_view *view)
7206 {
7207 	struct tog_tree_view_state *s = &view->state.tree;
7208 
7209 	free_colors(&s->colors);
7210 	free(s->tree_label);
7211 	s->tree_label = NULL;
7212 	free(s->commit_id);
7213 	s->commit_id = NULL;
7214 	free(s->head_ref_name);
7215 	s->head_ref_name = NULL;
7216 	while (!TAILQ_EMPTY(&s->parents)) {
7217 		struct tog_parent_tree *parent;
7218 		parent = TAILQ_FIRST(&s->parents);
7219 		TAILQ_REMOVE(&s->parents, parent, entry);
7220 		if (parent->tree != s->root)
7221 			got_object_tree_close(parent->tree);
7222 		free(parent);
7223 
7224 	}
7225 	if (s->tree != NULL && s->tree != s->root)
7226 		got_object_tree_close(s->tree);
7227 	if (s->root)
7228 		got_object_tree_close(s->root);
7229 	return NULL;
7230 }
7231 
7232 static const struct got_error *
7233 search_start_tree_view(struct tog_view *view)
7234 {
7235 	struct tog_tree_view_state *s = &view->state.tree;
7236 
7237 	s->matched_entry = NULL;
7238 	return NULL;
7239 }
7240 
7241 static int
7242 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7243 {
7244 	regmatch_t regmatch;
7245 
7246 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7247 	    0) == 0;
7248 }
7249 
7250 static const struct got_error *
7251 search_next_tree_view(struct tog_view *view)
7252 {
7253 	struct tog_tree_view_state *s = &view->state.tree;
7254 	struct got_tree_entry *te = NULL;
7255 
7256 	if (!view->searching) {
7257 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7258 		return NULL;
7259 	}
7260 
7261 	if (s->matched_entry) {
7262 		if (view->searching == TOG_SEARCH_FORWARD) {
7263 			if (s->selected_entry)
7264 				te = got_tree_entry_get_next(s->tree,
7265 				    s->selected_entry);
7266 			else
7267 				te = got_object_tree_get_first_entry(s->tree);
7268 		} else {
7269 			if (s->selected_entry == NULL)
7270 				te = got_object_tree_get_last_entry(s->tree);
7271 			else
7272 				te = got_tree_entry_get_prev(s->tree,
7273 				    s->selected_entry);
7274 		}
7275 	} else {
7276 		if (s->selected_entry)
7277 			te = s->selected_entry;
7278 		else if (view->searching == TOG_SEARCH_FORWARD)
7279 			te = got_object_tree_get_first_entry(s->tree);
7280 		else
7281 			te = got_object_tree_get_last_entry(s->tree);
7282 	}
7283 
7284 	while (1) {
7285 		if (te == NULL) {
7286 			if (s->matched_entry == NULL) {
7287 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7288 				return NULL;
7289 			}
7290 			if (view->searching == TOG_SEARCH_FORWARD)
7291 				te = got_object_tree_get_first_entry(s->tree);
7292 			else
7293 				te = got_object_tree_get_last_entry(s->tree);
7294 		}
7295 
7296 		if (match_tree_entry(te, &view->regex)) {
7297 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7298 			s->matched_entry = te;
7299 			break;
7300 		}
7301 
7302 		if (view->searching == TOG_SEARCH_FORWARD)
7303 			te = got_tree_entry_get_next(s->tree, te);
7304 		else
7305 			te = got_tree_entry_get_prev(s->tree, te);
7306 	}
7307 
7308 	if (s->matched_entry) {
7309 		s->first_displayed_entry = s->matched_entry;
7310 		s->selected = 0;
7311 	}
7312 
7313 	return NULL;
7314 }
7315 
7316 static const struct got_error *
7317 show_tree_view(struct tog_view *view)
7318 {
7319 	const struct got_error *err = NULL;
7320 	struct tog_tree_view_state *s = &view->state.tree;
7321 	char *parent_path;
7322 
7323 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7324 	if (err)
7325 		return err;
7326 
7327 	err = draw_tree_entries(view, parent_path);
7328 	free(parent_path);
7329 
7330 	view_border(view);
7331 	return err;
7332 }
7333 
7334 static const struct got_error *
7335 tree_goto_line(struct tog_view *view, int nlines)
7336 {
7337 	const struct got_error		 *err = NULL;
7338 	struct tog_tree_view_state	 *s = &view->state.tree;
7339 	struct got_tree_entry		**fte, **lte, **ste;
7340 	int				  g, last, first = 1, i = 1;
7341 	int				  root = s->tree == s->root;
7342 	int				  off = root ? 1 : 2;
7343 
7344 	g = view->gline;
7345 	view->gline = 0;
7346 
7347 	if (g == 0)
7348 		g = 1;
7349 	else if (g > got_object_tree_get_nentries(s->tree))
7350 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7351 
7352 	fte = &s->first_displayed_entry;
7353 	lte = &s->last_displayed_entry;
7354 	ste = &s->selected_entry;
7355 
7356 	if (*fte != NULL) {
7357 		first = got_tree_entry_get_index(*fte);
7358 		first += off;  /* account for ".." */
7359 	}
7360 	last = got_tree_entry_get_index(*lte);
7361 	last += off;
7362 
7363 	if (g >= first && g <= last && g - first < nlines) {
7364 		s->selected = g - first;
7365 		return NULL;	/* gline is on the current page */
7366 	}
7367 
7368 	if (*ste != NULL) {
7369 		i = got_tree_entry_get_index(*ste);
7370 		i += off;
7371 	}
7372 
7373 	if (i < g) {
7374 		err = tree_scroll_down(view, g - i);
7375 		if (err)
7376 			return err;
7377 		if (got_tree_entry_get_index(*lte) >=
7378 		    got_object_tree_get_nentries(s->tree) - 1 &&
7379 		    first + s->selected < g &&
7380 		    s->selected < s->ndisplayed - 1) {
7381 			first = got_tree_entry_get_index(*fte);
7382 			first += off;
7383 			s->selected = g - first;
7384 		}
7385 	} else if (i > g)
7386 		tree_scroll_up(s, i - g);
7387 
7388 	if (g < nlines &&
7389 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7390 		s->selected = g - 1;
7391 
7392 	return NULL;
7393 }
7394 
7395 static const struct got_error *
7396 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7397 {
7398 	const struct got_error *err = NULL;
7399 	struct tog_tree_view_state *s = &view->state.tree;
7400 	struct got_tree_entry *te;
7401 	int n, nscroll = view->nlines - 3;
7402 
7403 	if (view->gline)
7404 		return tree_goto_line(view, nscroll);
7405 
7406 	switch (ch) {
7407 	case '0':
7408 	case '$':
7409 	case KEY_RIGHT:
7410 	case 'l':
7411 	case KEY_LEFT:
7412 	case 'h':
7413 		horizontal_scroll_input(view, ch);
7414 		break;
7415 	case 'i':
7416 		s->show_ids = !s->show_ids;
7417 		view->count = 0;
7418 		break;
7419 	case 'L':
7420 		view->count = 0;
7421 		if (!s->selected_entry)
7422 			break;
7423 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7424 		break;
7425 	case 'R':
7426 		view->count = 0;
7427 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7428 		break;
7429 	case 'g':
7430 	case '=':
7431 	case KEY_HOME:
7432 		s->selected = 0;
7433 		view->count = 0;
7434 		if (s->tree == s->root)
7435 			s->first_displayed_entry =
7436 			    got_object_tree_get_first_entry(s->tree);
7437 		else
7438 			s->first_displayed_entry = NULL;
7439 		break;
7440 	case 'G':
7441 	case '*':
7442 	case KEY_END: {
7443 		int eos = view->nlines - 3;
7444 
7445 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7446 			--eos;  /* border */
7447 		s->selected = 0;
7448 		view->count = 0;
7449 		te = got_object_tree_get_last_entry(s->tree);
7450 		for (n = 0; n < eos; n++) {
7451 			if (te == NULL) {
7452 				if (s->tree != s->root) {
7453 					s->first_displayed_entry = NULL;
7454 					n++;
7455 				}
7456 				break;
7457 			}
7458 			s->first_displayed_entry = te;
7459 			te = got_tree_entry_get_prev(s->tree, te);
7460 		}
7461 		if (n > 0)
7462 			s->selected = n - 1;
7463 		break;
7464 	}
7465 	case 'k':
7466 	case KEY_UP:
7467 	case CTRL('p'):
7468 		if (s->selected > 0) {
7469 			s->selected--;
7470 			break;
7471 		}
7472 		tree_scroll_up(s, 1);
7473 		if (s->selected_entry == NULL ||
7474 		    (s->tree == s->root && s->selected_entry ==
7475 		     got_object_tree_get_first_entry(s->tree)))
7476 			view->count = 0;
7477 		break;
7478 	case CTRL('u'):
7479 	case 'u':
7480 		nscroll /= 2;
7481 		/* FALL THROUGH */
7482 	case KEY_PPAGE:
7483 	case CTRL('b'):
7484 	case 'b':
7485 		if (s->tree == s->root) {
7486 			if (got_object_tree_get_first_entry(s->tree) ==
7487 			    s->first_displayed_entry)
7488 				s->selected -= MIN(s->selected, nscroll);
7489 		} else {
7490 			if (s->first_displayed_entry == NULL)
7491 				s->selected -= MIN(s->selected, nscroll);
7492 		}
7493 		tree_scroll_up(s, MAX(0, nscroll));
7494 		if (s->selected_entry == NULL ||
7495 		    (s->tree == s->root && s->selected_entry ==
7496 		     got_object_tree_get_first_entry(s->tree)))
7497 			view->count = 0;
7498 		break;
7499 	case 'j':
7500 	case KEY_DOWN:
7501 	case CTRL('n'):
7502 		if (s->selected < s->ndisplayed - 1) {
7503 			s->selected++;
7504 			break;
7505 		}
7506 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7507 		    == NULL) {
7508 			/* can't scroll any further */
7509 			view->count = 0;
7510 			break;
7511 		}
7512 		tree_scroll_down(view, 1);
7513 		break;
7514 	case CTRL('d'):
7515 	case 'd':
7516 		nscroll /= 2;
7517 		/* FALL THROUGH */
7518 	case KEY_NPAGE:
7519 	case CTRL('f'):
7520 	case 'f':
7521 	case ' ':
7522 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7523 		    == NULL) {
7524 			/* can't scroll any further; move cursor down */
7525 			if (s->selected < s->ndisplayed - 1)
7526 				s->selected += MIN(nscroll,
7527 				    s->ndisplayed - s->selected - 1);
7528 			else
7529 				view->count = 0;
7530 			break;
7531 		}
7532 		tree_scroll_down(view, nscroll);
7533 		break;
7534 	case KEY_ENTER:
7535 	case '\r':
7536 	case KEY_BACKSPACE:
7537 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7538 			struct tog_parent_tree *parent;
7539 			/* user selected '..' */
7540 			if (s->tree == s->root) {
7541 				view->count = 0;
7542 				break;
7543 			}
7544 			parent = TAILQ_FIRST(&s->parents);
7545 			TAILQ_REMOVE(&s->parents, parent,
7546 			    entry);
7547 			got_object_tree_close(s->tree);
7548 			s->tree = parent->tree;
7549 			s->first_displayed_entry =
7550 			    parent->first_displayed_entry;
7551 			s->selected_entry =
7552 			    parent->selected_entry;
7553 			s->selected = parent->selected;
7554 			if (s->selected > view->nlines - 3) {
7555 				err = offset_selection_down(view);
7556 				if (err)
7557 					break;
7558 			}
7559 			free(parent);
7560 		} else if (S_ISDIR(got_tree_entry_get_mode(
7561 		    s->selected_entry))) {
7562 			struct got_tree_object *subtree;
7563 			view->count = 0;
7564 			err = got_object_open_as_tree(&subtree, s->repo,
7565 			    got_tree_entry_get_id(s->selected_entry));
7566 			if (err)
7567 				break;
7568 			err = tree_view_visit_subtree(s, subtree);
7569 			if (err) {
7570 				got_object_tree_close(subtree);
7571 				break;
7572 			}
7573 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7574 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7575 		break;
7576 	case KEY_RESIZE:
7577 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7578 			s->selected = view->nlines - 4;
7579 		view->count = 0;
7580 		break;
7581 	default:
7582 		view->count = 0;
7583 		break;
7584 	}
7585 
7586 	return err;
7587 }
7588 
7589 __dead static void
7590 usage_tree(void)
7591 {
7592 	endwin();
7593 	fprintf(stderr,
7594 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7595 	    getprogname());
7596 	exit(1);
7597 }
7598 
7599 static const struct got_error *
7600 cmd_tree(int argc, char *argv[])
7601 {
7602 	const struct got_error *error;
7603 	struct got_repository *repo = NULL;
7604 	struct got_worktree *worktree = NULL;
7605 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7606 	struct got_object_id *commit_id = NULL;
7607 	struct got_commit_object *commit = NULL;
7608 	const char *commit_id_arg = NULL;
7609 	char *label = NULL;
7610 	struct got_reference *ref = NULL;
7611 	const char *head_ref_name = NULL;
7612 	int ch;
7613 	struct tog_view *view;
7614 	int *pack_fds = NULL;
7615 
7616 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7617 		switch (ch) {
7618 		case 'c':
7619 			commit_id_arg = optarg;
7620 			break;
7621 		case 'r':
7622 			repo_path = realpath(optarg, NULL);
7623 			if (repo_path == NULL)
7624 				return got_error_from_errno2("realpath",
7625 				    optarg);
7626 			break;
7627 		default:
7628 			usage_tree();
7629 			/* NOTREACHED */
7630 		}
7631 	}
7632 
7633 	argc -= optind;
7634 	argv += optind;
7635 
7636 	if (argc > 1)
7637 		usage_tree();
7638 
7639 	error = got_repo_pack_fds_open(&pack_fds);
7640 	if (error != NULL)
7641 		goto done;
7642 
7643 	if (repo_path == NULL) {
7644 		cwd = getcwd(NULL, 0);
7645 		if (cwd == NULL)
7646 			return got_error_from_errno("getcwd");
7647 		error = got_worktree_open(&worktree, cwd);
7648 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7649 			goto done;
7650 		if (worktree)
7651 			repo_path =
7652 			    strdup(got_worktree_get_repo_path(worktree));
7653 		else
7654 			repo_path = strdup(cwd);
7655 		if (repo_path == NULL) {
7656 			error = got_error_from_errno("strdup");
7657 			goto done;
7658 		}
7659 	}
7660 
7661 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7662 	if (error != NULL)
7663 		goto done;
7664 
7665 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7666 	    repo, worktree);
7667 	if (error)
7668 		goto done;
7669 
7670 	init_curses();
7671 
7672 	error = apply_unveil(got_repo_get_path(repo), NULL);
7673 	if (error)
7674 		goto done;
7675 
7676 	error = tog_load_refs(repo, 0);
7677 	if (error)
7678 		goto done;
7679 
7680 	if (commit_id_arg == NULL) {
7681 		error = got_repo_match_object_id(&commit_id, &label,
7682 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7683 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7684 		if (error)
7685 			goto done;
7686 		head_ref_name = label;
7687 	} else {
7688 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7689 		if (error == NULL)
7690 			head_ref_name = got_ref_get_name(ref);
7691 		else if (error->code != GOT_ERR_NOT_REF)
7692 			goto done;
7693 		error = got_repo_match_object_id(&commit_id, NULL,
7694 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7695 		if (error)
7696 			goto done;
7697 	}
7698 
7699 	error = got_object_open_as_commit(&commit, repo, commit_id);
7700 	if (error)
7701 		goto done;
7702 
7703 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7704 	if (view == NULL) {
7705 		error = got_error_from_errno("view_open");
7706 		goto done;
7707 	}
7708 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7709 	if (error)
7710 		goto done;
7711 	if (!got_path_is_root_dir(in_repo_path)) {
7712 		error = tree_view_walk_path(&view->state.tree, commit,
7713 		    in_repo_path);
7714 		if (error)
7715 			goto done;
7716 	}
7717 
7718 	if (worktree) {
7719 		/* Release work tree lock. */
7720 		got_worktree_close(worktree);
7721 		worktree = NULL;
7722 	}
7723 	error = view_loop(view);
7724 done:
7725 	free(repo_path);
7726 	free(cwd);
7727 	free(commit_id);
7728 	free(label);
7729 	if (ref)
7730 		got_ref_close(ref);
7731 	if (repo) {
7732 		const struct got_error *close_err = got_repo_close(repo);
7733 		if (error == NULL)
7734 			error = close_err;
7735 	}
7736 	if (pack_fds) {
7737 		const struct got_error *pack_err =
7738 		    got_repo_pack_fds_close(pack_fds);
7739 		if (error == NULL)
7740 			error = pack_err;
7741 	}
7742 	tog_free_refs();
7743 	return error;
7744 }
7745 
7746 static const struct got_error *
7747 ref_view_load_refs(struct tog_ref_view_state *s)
7748 {
7749 	struct got_reflist_entry *sre;
7750 	struct tog_reflist_entry *re;
7751 
7752 	s->nrefs = 0;
7753 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7754 		if (strncmp(got_ref_get_name(sre->ref),
7755 		    "refs/got/", 9) == 0 &&
7756 		    strncmp(got_ref_get_name(sre->ref),
7757 		    "refs/got/backup/", 16) != 0)
7758 			continue;
7759 
7760 		re = malloc(sizeof(*re));
7761 		if (re == NULL)
7762 			return got_error_from_errno("malloc");
7763 
7764 		re->ref = got_ref_dup(sre->ref);
7765 		if (re->ref == NULL)
7766 			return got_error_from_errno("got_ref_dup");
7767 		re->idx = s->nrefs++;
7768 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7769 	}
7770 
7771 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7772 	return NULL;
7773 }
7774 
7775 static void
7776 ref_view_free_refs(struct tog_ref_view_state *s)
7777 {
7778 	struct tog_reflist_entry *re;
7779 
7780 	while (!TAILQ_EMPTY(&s->refs)) {
7781 		re = TAILQ_FIRST(&s->refs);
7782 		TAILQ_REMOVE(&s->refs, re, entry);
7783 		got_ref_close(re->ref);
7784 		free(re);
7785 	}
7786 }
7787 
7788 static const struct got_error *
7789 open_ref_view(struct tog_view *view, struct got_repository *repo)
7790 {
7791 	const struct got_error *err = NULL;
7792 	struct tog_ref_view_state *s = &view->state.ref;
7793 
7794 	s->selected_entry = 0;
7795 	s->repo = repo;
7796 
7797 	TAILQ_INIT(&s->refs);
7798 	STAILQ_INIT(&s->colors);
7799 
7800 	err = ref_view_load_refs(s);
7801 	if (err)
7802 		return err;
7803 
7804 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7805 		err = add_color(&s->colors, "^refs/heads/",
7806 		    TOG_COLOR_REFS_HEADS,
7807 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7808 		if (err)
7809 			goto done;
7810 
7811 		err = add_color(&s->colors, "^refs/tags/",
7812 		    TOG_COLOR_REFS_TAGS,
7813 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7814 		if (err)
7815 			goto done;
7816 
7817 		err = add_color(&s->colors, "^refs/remotes/",
7818 		    TOG_COLOR_REFS_REMOTES,
7819 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7820 		if (err)
7821 			goto done;
7822 
7823 		err = add_color(&s->colors, "^refs/got/backup/",
7824 		    TOG_COLOR_REFS_BACKUP,
7825 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7826 		if (err)
7827 			goto done;
7828 	}
7829 
7830 	view->show = show_ref_view;
7831 	view->input = input_ref_view;
7832 	view->close = close_ref_view;
7833 	view->search_start = search_start_ref_view;
7834 	view->search_next = search_next_ref_view;
7835 done:
7836 	if (err)
7837 		free_colors(&s->colors);
7838 	return err;
7839 }
7840 
7841 static const struct got_error *
7842 close_ref_view(struct tog_view *view)
7843 {
7844 	struct tog_ref_view_state *s = &view->state.ref;
7845 
7846 	ref_view_free_refs(s);
7847 	free_colors(&s->colors);
7848 
7849 	return NULL;
7850 }
7851 
7852 static const struct got_error *
7853 resolve_reflist_entry(struct got_object_id **commit_id,
7854     struct tog_reflist_entry *re, struct got_repository *repo)
7855 {
7856 	const struct got_error *err = NULL;
7857 	struct got_object_id *obj_id;
7858 	struct got_tag_object *tag = NULL;
7859 	int obj_type;
7860 
7861 	*commit_id = NULL;
7862 
7863 	err = got_ref_resolve(&obj_id, repo, re->ref);
7864 	if (err)
7865 		return err;
7866 
7867 	err = got_object_get_type(&obj_type, repo, obj_id);
7868 	if (err)
7869 		goto done;
7870 
7871 	switch (obj_type) {
7872 	case GOT_OBJ_TYPE_COMMIT:
7873 		*commit_id = obj_id;
7874 		break;
7875 	case GOT_OBJ_TYPE_TAG:
7876 		err = got_object_open_as_tag(&tag, repo, obj_id);
7877 		if (err)
7878 			goto done;
7879 		free(obj_id);
7880 		err = got_object_get_type(&obj_type, repo,
7881 		    got_object_tag_get_object_id(tag));
7882 		if (err)
7883 			goto done;
7884 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7885 			err = got_error(GOT_ERR_OBJ_TYPE);
7886 			goto done;
7887 		}
7888 		*commit_id = got_object_id_dup(
7889 		    got_object_tag_get_object_id(tag));
7890 		if (*commit_id == NULL) {
7891 			err = got_error_from_errno("got_object_id_dup");
7892 			goto done;
7893 		}
7894 		break;
7895 	default:
7896 		err = got_error(GOT_ERR_OBJ_TYPE);
7897 		break;
7898 	}
7899 
7900 done:
7901 	if (tag)
7902 		got_object_tag_close(tag);
7903 	if (err) {
7904 		free(*commit_id);
7905 		*commit_id = NULL;
7906 	}
7907 	return err;
7908 }
7909 
7910 static const struct got_error *
7911 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7912     struct tog_reflist_entry *re, struct got_repository *repo)
7913 {
7914 	struct tog_view *log_view;
7915 	const struct got_error *err = NULL;
7916 	struct got_object_id *commit_id = NULL;
7917 
7918 	*new_view = NULL;
7919 
7920 	err = resolve_reflist_entry(&commit_id, re, repo);
7921 	if (err) {
7922 		if (err->code != GOT_ERR_OBJ_TYPE)
7923 			return err;
7924 		else
7925 			return NULL;
7926 	}
7927 
7928 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7929 	if (log_view == NULL) {
7930 		err = got_error_from_errno("view_open");
7931 		goto done;
7932 	}
7933 
7934 	err = open_log_view(log_view, commit_id, repo,
7935 	    got_ref_get_name(re->ref), "", 0);
7936 done:
7937 	if (err)
7938 		view_close(log_view);
7939 	else
7940 		*new_view = log_view;
7941 	free(commit_id);
7942 	return err;
7943 }
7944 
7945 static void
7946 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7947 {
7948 	struct tog_reflist_entry *re;
7949 	int i = 0;
7950 
7951 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7952 		return;
7953 
7954 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7955 	while (i++ < maxscroll) {
7956 		if (re == NULL)
7957 			break;
7958 		s->first_displayed_entry = re;
7959 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7960 	}
7961 }
7962 
7963 static const struct got_error *
7964 ref_scroll_down(struct tog_view *view, int maxscroll)
7965 {
7966 	struct tog_ref_view_state *s = &view->state.ref;
7967 	struct tog_reflist_entry *next, *last;
7968 	int n = 0;
7969 
7970 	if (s->first_displayed_entry)
7971 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7972 	else
7973 		next = TAILQ_FIRST(&s->refs);
7974 
7975 	last = s->last_displayed_entry;
7976 	while (next && n++ < maxscroll) {
7977 		if (last) {
7978 			s->last_displayed_entry = last;
7979 			last = TAILQ_NEXT(last, entry);
7980 		}
7981 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7982 			s->first_displayed_entry = next;
7983 			next = TAILQ_NEXT(next, entry);
7984 		}
7985 	}
7986 
7987 	return NULL;
7988 }
7989 
7990 static const struct got_error *
7991 search_start_ref_view(struct tog_view *view)
7992 {
7993 	struct tog_ref_view_state *s = &view->state.ref;
7994 
7995 	s->matched_entry = NULL;
7996 	return NULL;
7997 }
7998 
7999 static int
8000 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8001 {
8002 	regmatch_t regmatch;
8003 
8004 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8005 	    0) == 0;
8006 }
8007 
8008 static const struct got_error *
8009 search_next_ref_view(struct tog_view *view)
8010 {
8011 	struct tog_ref_view_state *s = &view->state.ref;
8012 	struct tog_reflist_entry *re = NULL;
8013 
8014 	if (!view->searching) {
8015 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8016 		return NULL;
8017 	}
8018 
8019 	if (s->matched_entry) {
8020 		if (view->searching == TOG_SEARCH_FORWARD) {
8021 			if (s->selected_entry)
8022 				re = TAILQ_NEXT(s->selected_entry, entry);
8023 			else
8024 				re = TAILQ_PREV(s->selected_entry,
8025 				    tog_reflist_head, entry);
8026 		} else {
8027 			if (s->selected_entry == NULL)
8028 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8029 			else
8030 				re = TAILQ_PREV(s->selected_entry,
8031 				    tog_reflist_head, entry);
8032 		}
8033 	} else {
8034 		if (s->selected_entry)
8035 			re = s->selected_entry;
8036 		else if (view->searching == TOG_SEARCH_FORWARD)
8037 			re = TAILQ_FIRST(&s->refs);
8038 		else
8039 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8040 	}
8041 
8042 	while (1) {
8043 		if (re == NULL) {
8044 			if (s->matched_entry == NULL) {
8045 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8046 				return NULL;
8047 			}
8048 			if (view->searching == TOG_SEARCH_FORWARD)
8049 				re = TAILQ_FIRST(&s->refs);
8050 			else
8051 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8052 		}
8053 
8054 		if (match_reflist_entry(re, &view->regex)) {
8055 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8056 			s->matched_entry = re;
8057 			break;
8058 		}
8059 
8060 		if (view->searching == TOG_SEARCH_FORWARD)
8061 			re = TAILQ_NEXT(re, entry);
8062 		else
8063 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8064 	}
8065 
8066 	if (s->matched_entry) {
8067 		s->first_displayed_entry = s->matched_entry;
8068 		s->selected = 0;
8069 	}
8070 
8071 	return NULL;
8072 }
8073 
8074 static const struct got_error *
8075 show_ref_view(struct tog_view *view)
8076 {
8077 	const struct got_error *err = NULL;
8078 	struct tog_ref_view_state *s = &view->state.ref;
8079 	struct tog_reflist_entry *re;
8080 	char *line = NULL;
8081 	wchar_t *wline;
8082 	struct tog_color *tc;
8083 	int width, n, scrollx;
8084 	int limit = view->nlines;
8085 
8086 	werase(view->window);
8087 
8088 	s->ndisplayed = 0;
8089 	if (view_is_hsplit_top(view))
8090 		--limit;  /* border */
8091 
8092 	if (limit == 0)
8093 		return NULL;
8094 
8095 	re = s->first_displayed_entry;
8096 
8097 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8098 	    s->nrefs) == -1)
8099 		return got_error_from_errno("asprintf");
8100 
8101 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8102 	if (err) {
8103 		free(line);
8104 		return err;
8105 	}
8106 	if (view_needs_focus_indication(view))
8107 		wstandout(view->window);
8108 	waddwstr(view->window, wline);
8109 	while (width++ < view->ncols)
8110 		waddch(view->window, ' ');
8111 	if (view_needs_focus_indication(view))
8112 		wstandend(view->window);
8113 	free(wline);
8114 	wline = NULL;
8115 	free(line);
8116 	line = NULL;
8117 	if (--limit <= 0)
8118 		return NULL;
8119 
8120 	n = 0;
8121 	view->maxx = 0;
8122 	while (re && limit > 0) {
8123 		char *line = NULL;
8124 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8125 
8126 		if (s->show_date) {
8127 			struct got_commit_object *ci;
8128 			struct got_tag_object *tag;
8129 			struct got_object_id *id;
8130 			struct tm tm;
8131 			time_t t;
8132 
8133 			err = got_ref_resolve(&id, s->repo, re->ref);
8134 			if (err)
8135 				return err;
8136 			err = got_object_open_as_tag(&tag, s->repo, id);
8137 			if (err) {
8138 				if (err->code != GOT_ERR_OBJ_TYPE) {
8139 					free(id);
8140 					return err;
8141 				}
8142 				err = got_object_open_as_commit(&ci, s->repo,
8143 				    id);
8144 				if (err) {
8145 					free(id);
8146 					return err;
8147 				}
8148 				t = got_object_commit_get_committer_time(ci);
8149 				got_object_commit_close(ci);
8150 			} else {
8151 				t = got_object_tag_get_tagger_time(tag);
8152 				got_object_tag_close(tag);
8153 			}
8154 			free(id);
8155 			if (gmtime_r(&t, &tm) == NULL)
8156 				return got_error_from_errno("gmtime_r");
8157 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8158 				return got_error(GOT_ERR_NO_SPACE);
8159 		}
8160 		if (got_ref_is_symbolic(re->ref)) {
8161 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8162 			    ymd : "", got_ref_get_name(re->ref),
8163 			    got_ref_get_symref_target(re->ref)) == -1)
8164 				return got_error_from_errno("asprintf");
8165 		} else if (s->show_ids) {
8166 			struct got_object_id *id;
8167 			char *id_str;
8168 			err = got_ref_resolve(&id, s->repo, re->ref);
8169 			if (err)
8170 				return err;
8171 			err = got_object_id_str(&id_str, id);
8172 			if (err) {
8173 				free(id);
8174 				return err;
8175 			}
8176 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8177 			    got_ref_get_name(re->ref), id_str) == -1) {
8178 				err = got_error_from_errno("asprintf");
8179 				free(id);
8180 				free(id_str);
8181 				return err;
8182 			}
8183 			free(id);
8184 			free(id_str);
8185 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8186 		    got_ref_get_name(re->ref)) == -1)
8187 			return got_error_from_errno("asprintf");
8188 
8189 		/* use full line width to determine view->maxx */
8190 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8191 		if (err) {
8192 			free(line);
8193 			return err;
8194 		}
8195 		view->maxx = MAX(view->maxx, width);
8196 		free(wline);
8197 		wline = NULL;
8198 
8199 		err = format_line(&wline, &width, &scrollx, line, view->x,
8200 		    view->ncols, 0, 0);
8201 		if (err) {
8202 			free(line);
8203 			return err;
8204 		}
8205 		if (n == s->selected) {
8206 			if (view->focussed)
8207 				wstandout(view->window);
8208 			s->selected_entry = re;
8209 		}
8210 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8211 		if (tc)
8212 			wattr_on(view->window,
8213 			    COLOR_PAIR(tc->colorpair), NULL);
8214 		waddwstr(view->window, &wline[scrollx]);
8215 		if (tc)
8216 			wattr_off(view->window,
8217 			    COLOR_PAIR(tc->colorpair), NULL);
8218 		if (width < view->ncols)
8219 			waddch(view->window, '\n');
8220 		if (n == s->selected && view->focussed)
8221 			wstandend(view->window);
8222 		free(line);
8223 		free(wline);
8224 		wline = NULL;
8225 		n++;
8226 		s->ndisplayed++;
8227 		s->last_displayed_entry = re;
8228 
8229 		limit--;
8230 		re = TAILQ_NEXT(re, entry);
8231 	}
8232 
8233 	view_border(view);
8234 	return err;
8235 }
8236 
8237 static const struct got_error *
8238 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8239     struct tog_reflist_entry *re, struct got_repository *repo)
8240 {
8241 	const struct got_error *err = NULL;
8242 	struct got_object_id *commit_id = NULL;
8243 	struct tog_view *tree_view;
8244 
8245 	*new_view = NULL;
8246 
8247 	err = resolve_reflist_entry(&commit_id, re, repo);
8248 	if (err) {
8249 		if (err->code != GOT_ERR_OBJ_TYPE)
8250 			return err;
8251 		else
8252 			return NULL;
8253 	}
8254 
8255 
8256 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8257 	if (tree_view == NULL) {
8258 		err = got_error_from_errno("view_open");
8259 		goto done;
8260 	}
8261 
8262 	err = open_tree_view(tree_view, commit_id,
8263 	    got_ref_get_name(re->ref), repo);
8264 	if (err)
8265 		goto done;
8266 
8267 	*new_view = tree_view;
8268 done:
8269 	free(commit_id);
8270 	return err;
8271 }
8272 
8273 static const struct got_error *
8274 ref_goto_line(struct tog_view *view, int nlines)
8275 {
8276 	const struct got_error		*err = NULL;
8277 	struct tog_ref_view_state	*s = &view->state.ref;
8278 	int				 g, idx = s->selected_entry->idx;
8279 
8280 	g = view->gline;
8281 	view->gline = 0;
8282 
8283 	if (g == 0)
8284 		g = 1;
8285 	else if (g > s->nrefs)
8286 		g = s->nrefs;
8287 
8288 	if (g >= s->first_displayed_entry->idx + 1 &&
8289 	    g <= s->last_displayed_entry->idx + 1 &&
8290 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8291 		s->selected = g - s->first_displayed_entry->idx - 1;
8292 		return NULL;
8293 	}
8294 
8295 	if (idx + 1 < g) {
8296 		err = ref_scroll_down(view, g - idx - 1);
8297 		if (err)
8298 			return err;
8299 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8300 		    s->first_displayed_entry->idx + s->selected < g &&
8301 		    s->selected < s->ndisplayed - 1)
8302 			s->selected = g - s->first_displayed_entry->idx - 1;
8303 	} else if (idx + 1 > g)
8304 		ref_scroll_up(s, idx - g + 1);
8305 
8306 	if (g < nlines && s->first_displayed_entry->idx == 0)
8307 		s->selected = g - 1;
8308 
8309 	return NULL;
8310 
8311 }
8312 
8313 static const struct got_error *
8314 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8315 {
8316 	const struct got_error *err = NULL;
8317 	struct tog_ref_view_state *s = &view->state.ref;
8318 	struct tog_reflist_entry *re;
8319 	int n, nscroll = view->nlines - 1;
8320 
8321 	if (view->gline)
8322 		return ref_goto_line(view, nscroll);
8323 
8324 	switch (ch) {
8325 	case '0':
8326 	case '$':
8327 	case KEY_RIGHT:
8328 	case 'l':
8329 	case KEY_LEFT:
8330 	case 'h':
8331 		horizontal_scroll_input(view, ch);
8332 		break;
8333 	case 'i':
8334 		s->show_ids = !s->show_ids;
8335 		view->count = 0;
8336 		break;
8337 	case 'm':
8338 		s->show_date = !s->show_date;
8339 		view->count = 0;
8340 		break;
8341 	case 'o':
8342 		s->sort_by_date = !s->sort_by_date;
8343 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8344 		view->count = 0;
8345 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8346 		    got_ref_cmp_by_commit_timestamp_descending :
8347 		    tog_ref_cmp_by_name, s->repo);
8348 		if (err)
8349 			break;
8350 		got_reflist_object_id_map_free(tog_refs_idmap);
8351 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8352 		    &tog_refs, s->repo);
8353 		if (err)
8354 			break;
8355 		ref_view_free_refs(s);
8356 		err = ref_view_load_refs(s);
8357 		break;
8358 	case KEY_ENTER:
8359 	case '\r':
8360 		view->count = 0;
8361 		if (!s->selected_entry)
8362 			break;
8363 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8364 		break;
8365 	case 'T':
8366 		view->count = 0;
8367 		if (!s->selected_entry)
8368 			break;
8369 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8370 		break;
8371 	case 'g':
8372 	case '=':
8373 	case KEY_HOME:
8374 		s->selected = 0;
8375 		view->count = 0;
8376 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8377 		break;
8378 	case 'G':
8379 	case '*':
8380 	case KEY_END: {
8381 		int eos = view->nlines - 1;
8382 
8383 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8384 			--eos;  /* border */
8385 		s->selected = 0;
8386 		view->count = 0;
8387 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8388 		for (n = 0; n < eos; n++) {
8389 			if (re == NULL)
8390 				break;
8391 			s->first_displayed_entry = re;
8392 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8393 		}
8394 		if (n > 0)
8395 			s->selected = n - 1;
8396 		break;
8397 	}
8398 	case 'k':
8399 	case KEY_UP:
8400 	case CTRL('p'):
8401 		if (s->selected > 0) {
8402 			s->selected--;
8403 			break;
8404 		}
8405 		ref_scroll_up(s, 1);
8406 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8407 			view->count = 0;
8408 		break;
8409 	case CTRL('u'):
8410 	case 'u':
8411 		nscroll /= 2;
8412 		/* FALL THROUGH */
8413 	case KEY_PPAGE:
8414 	case CTRL('b'):
8415 	case 'b':
8416 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8417 			s->selected -= MIN(nscroll, s->selected);
8418 		ref_scroll_up(s, MAX(0, nscroll));
8419 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8420 			view->count = 0;
8421 		break;
8422 	case 'j':
8423 	case KEY_DOWN:
8424 	case CTRL('n'):
8425 		if (s->selected < s->ndisplayed - 1) {
8426 			s->selected++;
8427 			break;
8428 		}
8429 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8430 			/* can't scroll any further */
8431 			view->count = 0;
8432 			break;
8433 		}
8434 		ref_scroll_down(view, 1);
8435 		break;
8436 	case CTRL('d'):
8437 	case 'd':
8438 		nscroll /= 2;
8439 		/* FALL THROUGH */
8440 	case KEY_NPAGE:
8441 	case CTRL('f'):
8442 	case 'f':
8443 	case ' ':
8444 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8445 			/* can't scroll any further; move cursor down */
8446 			if (s->selected < s->ndisplayed - 1)
8447 				s->selected += MIN(nscroll,
8448 				    s->ndisplayed - s->selected - 1);
8449 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8450 				s->selected += s->ndisplayed - s->selected - 1;
8451 			view->count = 0;
8452 			break;
8453 		}
8454 		ref_scroll_down(view, nscroll);
8455 		break;
8456 	case CTRL('l'):
8457 		view->count = 0;
8458 		tog_free_refs();
8459 		err = tog_load_refs(s->repo, s->sort_by_date);
8460 		if (err)
8461 			break;
8462 		ref_view_free_refs(s);
8463 		err = ref_view_load_refs(s);
8464 		break;
8465 	case KEY_RESIZE:
8466 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8467 			s->selected = view->nlines - 2;
8468 		break;
8469 	default:
8470 		view->count = 0;
8471 		break;
8472 	}
8473 
8474 	return err;
8475 }
8476 
8477 __dead static void
8478 usage_ref(void)
8479 {
8480 	endwin();
8481 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8482 	    getprogname());
8483 	exit(1);
8484 }
8485 
8486 static const struct got_error *
8487 cmd_ref(int argc, char *argv[])
8488 {
8489 	const struct got_error *error;
8490 	struct got_repository *repo = NULL;
8491 	struct got_worktree *worktree = NULL;
8492 	char *cwd = NULL, *repo_path = NULL;
8493 	int ch;
8494 	struct tog_view *view;
8495 	int *pack_fds = NULL;
8496 
8497 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8498 		switch (ch) {
8499 		case 'r':
8500 			repo_path = realpath(optarg, NULL);
8501 			if (repo_path == NULL)
8502 				return got_error_from_errno2("realpath",
8503 				    optarg);
8504 			break;
8505 		default:
8506 			usage_ref();
8507 			/* NOTREACHED */
8508 		}
8509 	}
8510 
8511 	argc -= optind;
8512 	argv += optind;
8513 
8514 	if (argc > 1)
8515 		usage_ref();
8516 
8517 	error = got_repo_pack_fds_open(&pack_fds);
8518 	if (error != NULL)
8519 		goto done;
8520 
8521 	if (repo_path == NULL) {
8522 		cwd = getcwd(NULL, 0);
8523 		if (cwd == NULL)
8524 			return got_error_from_errno("getcwd");
8525 		error = got_worktree_open(&worktree, cwd);
8526 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8527 			goto done;
8528 		if (worktree)
8529 			repo_path =
8530 			    strdup(got_worktree_get_repo_path(worktree));
8531 		else
8532 			repo_path = strdup(cwd);
8533 		if (repo_path == NULL) {
8534 			error = got_error_from_errno("strdup");
8535 			goto done;
8536 		}
8537 	}
8538 
8539 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8540 	if (error != NULL)
8541 		goto done;
8542 
8543 	init_curses();
8544 
8545 	error = apply_unveil(got_repo_get_path(repo), NULL);
8546 	if (error)
8547 		goto done;
8548 
8549 	error = tog_load_refs(repo, 0);
8550 	if (error)
8551 		goto done;
8552 
8553 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8554 	if (view == NULL) {
8555 		error = got_error_from_errno("view_open");
8556 		goto done;
8557 	}
8558 
8559 	error = open_ref_view(view, repo);
8560 	if (error)
8561 		goto done;
8562 
8563 	if (worktree) {
8564 		/* Release work tree lock. */
8565 		got_worktree_close(worktree);
8566 		worktree = NULL;
8567 	}
8568 	error = view_loop(view);
8569 done:
8570 	free(repo_path);
8571 	free(cwd);
8572 	if (repo) {
8573 		const struct got_error *close_err = got_repo_close(repo);
8574 		if (close_err)
8575 			error = close_err;
8576 	}
8577 	if (pack_fds) {
8578 		const struct got_error *pack_err =
8579 		    got_repo_pack_fds_close(pack_fds);
8580 		if (error == NULL)
8581 			error = pack_err;
8582 	}
8583 	tog_free_refs();
8584 	return error;
8585 }
8586 
8587 static const struct got_error*
8588 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8589     const char *str)
8590 {
8591 	size_t len;
8592 
8593 	if (win == NULL)
8594 		win = stdscr;
8595 
8596 	len = strlen(str);
8597 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8598 
8599 	if (focus)
8600 		wstandout(win);
8601 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8602 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8603 	if (focus)
8604 		wstandend(win);
8605 
8606 	return NULL;
8607 }
8608 
8609 static const struct got_error *
8610 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8611 {
8612 	off_t *p;
8613 
8614 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8615 	if (p == NULL) {
8616 		free(*line_offsets);
8617 		*line_offsets = NULL;
8618 		return got_error_from_errno("reallocarray");
8619 	}
8620 
8621 	*line_offsets = p;
8622 	(*line_offsets)[*nlines] = off;
8623 	++(*nlines);
8624 	return NULL;
8625 }
8626 
8627 static const struct got_error *
8628 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8629 {
8630 	*ret = 0;
8631 
8632 	for (;n > 0; --n, ++km) {
8633 		char	*t0, *t, *k;
8634 		size_t	 len = 1;
8635 
8636 		if (km->keys == NULL)
8637 			continue;
8638 
8639 		t = t0 = strdup(km->keys);
8640 		if (t0 == NULL)
8641 			return got_error_from_errno("strdup");
8642 
8643 		len += strlen(t);
8644 		while ((k = strsep(&t, " ")) != NULL)
8645 			len += strlen(k) > 1 ? 2 : 0;
8646 		free(t0);
8647 		*ret = MAX(*ret, len);
8648 	}
8649 
8650 	return NULL;
8651 }
8652 
8653 /*
8654  * Write keymap section headers, keys, and key info in km to f.
8655  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8656  * wrap control and symbolic keys in guillemets, else use <>.
8657  */
8658 static const struct got_error *
8659 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8660 {
8661 	int n, len = width;
8662 
8663 	if (km->keys) {
8664 		static const char *u8_glyph[] = {
8665 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8666 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8667 		};
8668 		char	*t0, *t, *k;
8669 		int	 cs, s, first = 1;
8670 
8671 		cs = got_locale_is_utf8();
8672 
8673 		t = t0 = strdup(km->keys);
8674 		if (t0 == NULL)
8675 			return got_error_from_errno("strdup");
8676 
8677 		len = strlen(km->keys);
8678 		while ((k = strsep(&t, " ")) != NULL) {
8679 			s = strlen(k) > 1;  /* control or symbolic key */
8680 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8681 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8682 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8683 			if (n < 0) {
8684 				free(t0);
8685 				return got_error_from_errno("fprintf");
8686 			}
8687 			first = 0;
8688 			len += s ? 2 : 0;
8689 			*off += n;
8690 		}
8691 		free(t0);
8692 	}
8693 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8694 	if (n < 0)
8695 		return got_error_from_errno("fprintf");
8696 	*off += n;
8697 
8698 	return NULL;
8699 }
8700 
8701 static const struct got_error *
8702 format_help(struct tog_help_view_state *s)
8703 {
8704 	const struct got_error		*err = NULL;
8705 	off_t				 off = 0;
8706 	int				 i, max, n, show = s->all;
8707 	static const struct tog_key_map	 km[] = {
8708 #define KEYMAP_(info, type)	{ NULL, (info), type }
8709 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8710 		GENERATE_HELP
8711 #undef KEYMAP_
8712 #undef KEY_
8713 	};
8714 
8715 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8716 	if (err)
8717 		return err;
8718 
8719 	n = nitems(km);
8720 	err = max_key_str(&max, km, n);
8721 	if (err)
8722 		return err;
8723 
8724 	for (i = 0; i < n; ++i) {
8725 		if (km[i].keys == NULL) {
8726 			show = s->all;
8727 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8728 			    km[i].type == s->type || s->all)
8729 				show = 1;
8730 		}
8731 		if (show) {
8732 			err = format_help_line(&off, s->f, &km[i], max);
8733 			if (err)
8734 				return err;
8735 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8736 			if (err)
8737 				return err;
8738 		}
8739 	}
8740 	fputc('\n', s->f);
8741 	++off;
8742 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8743 	return err;
8744 }
8745 
8746 static const struct got_error *
8747 create_help(struct tog_help_view_state *s)
8748 {
8749 	FILE			*f;
8750 	const struct got_error	*err;
8751 
8752 	free(s->line_offsets);
8753 	s->line_offsets = NULL;
8754 	s->nlines = 0;
8755 
8756 	f = got_opentemp();
8757 	if (f == NULL)
8758 		return got_error_from_errno("got_opentemp");
8759 	s->f = f;
8760 
8761 	err = format_help(s);
8762 	if (err)
8763 		return err;
8764 
8765 	if (s->f && fflush(s->f) != 0)
8766 		return got_error_from_errno("fflush");
8767 
8768 	return NULL;
8769 }
8770 
8771 static const struct got_error *
8772 search_start_help_view(struct tog_view *view)
8773 {
8774 	view->state.help.matched_line = 0;
8775 	return NULL;
8776 }
8777 
8778 static void
8779 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8780     size_t *nlines, int **first, int **last, int **match, int **selected)
8781 {
8782 	struct tog_help_view_state *s = &view->state.help;
8783 
8784 	*f = s->f;
8785 	*nlines = s->nlines;
8786 	*line_offsets = s->line_offsets;
8787 	*match = &s->matched_line;
8788 	*first = &s->first_displayed_line;
8789 	*last = &s->last_displayed_line;
8790 	*selected = &s->selected_line;
8791 }
8792 
8793 static const struct got_error *
8794 show_help_view(struct tog_view *view)
8795 {
8796 	struct tog_help_view_state	*s = &view->state.help;
8797 	const struct got_error		*err;
8798 	regmatch_t			*regmatch = &view->regmatch;
8799 	wchar_t				*wline;
8800 	char				*line;
8801 	ssize_t				 linelen;
8802 	size_t				 linesz = 0;
8803 	int				 width, nprinted = 0, rc = 0;
8804 	int				 eos = view->nlines;
8805 
8806 	if (view_is_hsplit_top(view))
8807 		--eos;  /* account for border */
8808 
8809 	s->lineno = 0;
8810 	rewind(s->f);
8811 	werase(view->window);
8812 
8813 	if (view->gline > s->nlines - 1)
8814 		view->gline = s->nlines - 1;
8815 
8816 	err = win_draw_center(view->window, 0, 0, view->ncols,
8817 	    view_needs_focus_indication(view),
8818 	    "tog help (press q to return to tog)");
8819 	if (err)
8820 		return err;
8821 	if (eos <= 1)
8822 		return NULL;
8823 	waddstr(view->window, "\n\n");
8824 	eos -= 2;
8825 
8826 	s->eof = 0;
8827 	view->maxx = 0;
8828 	line = NULL;
8829 	while (eos > 0 && nprinted < eos) {
8830 		attr_t attr = 0;
8831 
8832 		linelen = getline(&line, &linesz, s->f);
8833 		if (linelen == -1) {
8834 			if (!feof(s->f)) {
8835 				free(line);
8836 				return got_ferror(s->f, GOT_ERR_IO);
8837 			}
8838 			s->eof = 1;
8839 			break;
8840 		}
8841 		if (++s->lineno < s->first_displayed_line)
8842 			continue;
8843 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8844 			continue;
8845 		if (s->lineno == view->hiline)
8846 			attr = A_STANDOUT;
8847 
8848 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8849 		    view->x ? 1 : 0);
8850 		if (err) {
8851 			free(line);
8852 			return err;
8853 		}
8854 		view->maxx = MAX(view->maxx, width);
8855 		free(wline);
8856 		wline = NULL;
8857 
8858 		if (attr)
8859 			wattron(view->window, attr);
8860 		if (s->first_displayed_line + nprinted == s->matched_line &&
8861 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8862 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8863 			    view->window, view->x, regmatch);
8864 			if (err) {
8865 				free(line);
8866 				return err;
8867 			}
8868 		} else {
8869 			int skip;
8870 
8871 			err = format_line(&wline, &width, &skip, line,
8872 			    view->x, view->ncols, 0, view->x ? 1 : 0);
8873 			if (err) {
8874 				free(line);
8875 				return err;
8876 			}
8877 			waddwstr(view->window, &wline[skip]);
8878 			free(wline);
8879 			wline = NULL;
8880 		}
8881 		if (s->lineno == view->hiline) {
8882 			while (width++ < view->ncols)
8883 				waddch(view->window, ' ');
8884 		} else {
8885 			if (width < view->ncols)
8886 				waddch(view->window, '\n');
8887 		}
8888 		if (attr)
8889 			wattroff(view->window, attr);
8890 		if (++nprinted == 1)
8891 			s->first_displayed_line = s->lineno;
8892 	}
8893 	free(line);
8894 	if (nprinted > 0)
8895 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8896 	else
8897 		s->last_displayed_line = s->first_displayed_line;
8898 
8899 	view_border(view);
8900 
8901 	if (s->eof) {
8902 		rc = waddnstr(view->window,
8903 		    "See the tog(1) manual page for full documentation",
8904 		    view->ncols - 1);
8905 		if (rc == ERR)
8906 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8907 	} else {
8908 		wmove(view->window, view->nlines - 1, 0);
8909 		wclrtoeol(view->window);
8910 		wstandout(view->window);
8911 		rc = waddnstr(view->window, "scroll down for more...",
8912 		    view->ncols - 1);
8913 		if (rc == ERR)
8914 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8915 		if (getcurx(view->window) < view->ncols - 6) {
8916 			rc = wprintw(view->window, "[%.0f%%]",
8917 			    100.00 * s->last_displayed_line / s->nlines);
8918 			if (rc == ERR)
8919 				return got_error_msg(GOT_ERR_IO, "wprintw");
8920 		}
8921 		wstandend(view->window);
8922 	}
8923 
8924 	return NULL;
8925 }
8926 
8927 static const struct got_error *
8928 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8929 {
8930 	struct tog_help_view_state	*s = &view->state.help;
8931 	const struct got_error		*err = NULL;
8932 	char				*line = NULL;
8933 	ssize_t				 linelen;
8934 	size_t				 linesz = 0;
8935 	int				 eos, nscroll;
8936 
8937 	eos = nscroll = view->nlines;
8938 	if (view_is_hsplit_top(view))
8939 		--eos;  /* border */
8940 
8941 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8942 
8943 	switch (ch) {
8944 	case '0':
8945 	case '$':
8946 	case KEY_RIGHT:
8947 	case 'l':
8948 	case KEY_LEFT:
8949 	case 'h':
8950 		horizontal_scroll_input(view, ch);
8951 		break;
8952 	case 'g':
8953 	case KEY_HOME:
8954 		s->first_displayed_line = 1;
8955 		view->count = 0;
8956 		break;
8957 	case 'G':
8958 	case KEY_END:
8959 		view->count = 0;
8960 		if (s->eof)
8961 			break;
8962 		s->first_displayed_line = (s->nlines - eos) + 3;
8963 		s->eof = 1;
8964 		break;
8965 	case 'k':
8966 	case KEY_UP:
8967 		if (s->first_displayed_line > 1)
8968 			--s->first_displayed_line;
8969 		else
8970 			view->count = 0;
8971 		break;
8972 	case CTRL('u'):
8973 	case 'u':
8974 		nscroll /= 2;
8975 		/* FALL THROUGH */
8976 	case KEY_PPAGE:
8977 	case CTRL('b'):
8978 	case 'b':
8979 		if (s->first_displayed_line == 1) {
8980 			view->count = 0;
8981 			break;
8982 		}
8983 		while (--nscroll > 0 && s->first_displayed_line > 1)
8984 			s->first_displayed_line--;
8985 		break;
8986 	case 'j':
8987 	case KEY_DOWN:
8988 	case CTRL('n'):
8989 		if (!s->eof)
8990 			++s->first_displayed_line;
8991 		else
8992 			view->count = 0;
8993 		break;
8994 	case CTRL('d'):
8995 	case 'd':
8996 		nscroll /= 2;
8997 		/* FALL THROUGH */
8998 	case KEY_NPAGE:
8999 	case CTRL('f'):
9000 	case 'f':
9001 	case ' ':
9002 		if (s->eof) {
9003 			view->count = 0;
9004 			break;
9005 		}
9006 		while (!s->eof && --nscroll > 0) {
9007 			linelen = getline(&line, &linesz, s->f);
9008 			s->first_displayed_line++;
9009 			if (linelen == -1) {
9010 				if (feof(s->f))
9011 					s->eof = 1;
9012 				else
9013 					err = got_ferror(s->f, GOT_ERR_IO);
9014 				break;
9015 			}
9016 		}
9017 		free(line);
9018 		break;
9019 	default:
9020 		view->count = 0;
9021 		break;
9022 	}
9023 
9024 	return err;
9025 }
9026 
9027 static const struct got_error *
9028 close_help_view(struct tog_view *view)
9029 {
9030 	struct tog_help_view_state *s = &view->state.help;
9031 
9032 	free(s->line_offsets);
9033 	s->line_offsets = NULL;
9034 	if (fclose(s->f) == EOF)
9035 		return got_error_from_errno("fclose");
9036 
9037 	return NULL;
9038 }
9039 
9040 static const struct got_error *
9041 reset_help_view(struct tog_view *view)
9042 {
9043 	struct tog_help_view_state *s = &view->state.help;
9044 
9045 
9046 	if (s->f && fclose(s->f) == EOF)
9047 		return got_error_from_errno("fclose");
9048 
9049 	wclear(view->window);
9050 	view->count = 0;
9051 	view->x = 0;
9052 	s->all = !s->all;
9053 	s->first_displayed_line = 1;
9054 	s->last_displayed_line = view->nlines;
9055 	s->matched_line = 0;
9056 
9057 	return create_help(s);
9058 }
9059 
9060 static const struct got_error *
9061 open_help_view(struct tog_view *view, struct tog_view *parent)
9062 {
9063 	const struct got_error		*err = NULL;
9064 	struct tog_help_view_state	*s = &view->state.help;
9065 
9066 	s->type = (enum tog_keymap_type)parent->type;
9067 	s->first_displayed_line = 1;
9068 	s->last_displayed_line = view->nlines;
9069 	s->selected_line = 1;
9070 
9071 	view->show = show_help_view;
9072 	view->input = input_help_view;
9073 	view->reset = reset_help_view;
9074 	view->close = close_help_view;
9075 	view->search_start = search_start_help_view;
9076 	view->search_setup = search_setup_help_view;
9077 	view->search_next = search_next_view_match;
9078 
9079 	err = create_help(s);
9080 	return err;
9081 }
9082 
9083 static const struct got_error *
9084 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9085     enum tog_view_type request, int y, int x)
9086 {
9087 	const struct got_error *err = NULL;
9088 
9089 	*new_view = NULL;
9090 
9091 	switch (request) {
9092 	case TOG_VIEW_DIFF:
9093 		if (view->type == TOG_VIEW_LOG) {
9094 			struct tog_log_view_state *s = &view->state.log;
9095 
9096 			err = open_diff_view_for_commit(new_view, y, x,
9097 			    s->selected_entry->commit, s->selected_entry->id,
9098 			    view, s->repo);
9099 		} else
9100 			return got_error_msg(GOT_ERR_NOT_IMPL,
9101 			    "parent/child view pair not supported");
9102 		break;
9103 	case TOG_VIEW_BLAME:
9104 		if (view->type == TOG_VIEW_TREE) {
9105 			struct tog_tree_view_state *s = &view->state.tree;
9106 
9107 			err = blame_tree_entry(new_view, y, x,
9108 			    s->selected_entry, &s->parents, s->commit_id,
9109 			    s->repo);
9110 		} else
9111 			return got_error_msg(GOT_ERR_NOT_IMPL,
9112 			    "parent/child view pair not supported");
9113 		break;
9114 	case TOG_VIEW_LOG:
9115 		if (view->type == TOG_VIEW_BLAME)
9116 			err = log_annotated_line(new_view, y, x,
9117 			    view->state.blame.repo, view->state.blame.id_to_log);
9118 		else if (view->type == TOG_VIEW_TREE)
9119 			err = log_selected_tree_entry(new_view, y, x,
9120 			    &view->state.tree);
9121 		else if (view->type == TOG_VIEW_REF)
9122 			err = log_ref_entry(new_view, y, x,
9123 			    view->state.ref.selected_entry,
9124 			    view->state.ref.repo);
9125 		else
9126 			return got_error_msg(GOT_ERR_NOT_IMPL,
9127 			    "parent/child view pair not supported");
9128 		break;
9129 	case TOG_VIEW_TREE:
9130 		if (view->type == TOG_VIEW_LOG)
9131 			err = browse_commit_tree(new_view, y, x,
9132 			    view->state.log.selected_entry,
9133 			    view->state.log.in_repo_path,
9134 			    view->state.log.head_ref_name,
9135 			    view->state.log.repo);
9136 		else if (view->type == TOG_VIEW_REF)
9137 			err = browse_ref_tree(new_view, y, x,
9138 			    view->state.ref.selected_entry,
9139 			    view->state.ref.repo);
9140 		else
9141 			return got_error_msg(GOT_ERR_NOT_IMPL,
9142 			    "parent/child view pair not supported");
9143 		break;
9144 	case TOG_VIEW_REF:
9145 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9146 		if (*new_view == NULL)
9147 			return got_error_from_errno("view_open");
9148 		if (view->type == TOG_VIEW_LOG)
9149 			err = open_ref_view(*new_view, view->state.log.repo);
9150 		else if (view->type == TOG_VIEW_TREE)
9151 			err = open_ref_view(*new_view, view->state.tree.repo);
9152 		else
9153 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9154 			    "parent/child view pair not supported");
9155 		if (err)
9156 			view_close(*new_view);
9157 		break;
9158 	case TOG_VIEW_HELP:
9159 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9160 		if (*new_view == NULL)
9161 			return got_error_from_errno("view_open");
9162 		err = open_help_view(*new_view, view);
9163 		if (err)
9164 			view_close(*new_view);
9165 		break;
9166 	default:
9167 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9168 	}
9169 
9170 	return err;
9171 }
9172 
9173 /*
9174  * If view was scrolled down to move the selected line into view when opening a
9175  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9176  */
9177 static void
9178 offset_selection_up(struct tog_view *view)
9179 {
9180 	switch (view->type) {
9181 	case TOG_VIEW_BLAME: {
9182 		struct tog_blame_view_state *s = &view->state.blame;
9183 		if (s->first_displayed_line == 1) {
9184 			s->selected_line = MAX(s->selected_line - view->offset,
9185 			    1);
9186 			break;
9187 		}
9188 		if (s->first_displayed_line > view->offset)
9189 			s->first_displayed_line -= view->offset;
9190 		else
9191 			s->first_displayed_line = 1;
9192 		s->selected_line += view->offset;
9193 		break;
9194 	}
9195 	case TOG_VIEW_LOG:
9196 		log_scroll_up(&view->state.log, view->offset);
9197 		view->state.log.selected += view->offset;
9198 		break;
9199 	case TOG_VIEW_REF:
9200 		ref_scroll_up(&view->state.ref, view->offset);
9201 		view->state.ref.selected += view->offset;
9202 		break;
9203 	case TOG_VIEW_TREE:
9204 		tree_scroll_up(&view->state.tree, view->offset);
9205 		view->state.tree.selected += view->offset;
9206 		break;
9207 	default:
9208 		break;
9209 	}
9210 
9211 	view->offset = 0;
9212 }
9213 
9214 /*
9215  * If the selected line is in the section of screen covered by the bottom split,
9216  * scroll down offset lines to move it into view and index its new position.
9217  */
9218 static const struct got_error *
9219 offset_selection_down(struct tog_view *view)
9220 {
9221 	const struct got_error	*err = NULL;
9222 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9223 	int			*selected = NULL;
9224 	int			 header, offset;
9225 
9226 	switch (view->type) {
9227 	case TOG_VIEW_BLAME: {
9228 		struct tog_blame_view_state *s = &view->state.blame;
9229 		header = 3;
9230 		scrolld = NULL;
9231 		if (s->selected_line > view->nlines - header) {
9232 			offset = abs(view->nlines - s->selected_line - header);
9233 			s->first_displayed_line += offset;
9234 			s->selected_line -= offset;
9235 			view->offset = offset;
9236 		}
9237 		break;
9238 	}
9239 	case TOG_VIEW_LOG: {
9240 		struct tog_log_view_state *s = &view->state.log;
9241 		scrolld = &log_scroll_down;
9242 		header = view_is_parent_view(view) ? 3 : 2;
9243 		selected = &s->selected;
9244 		break;
9245 	}
9246 	case TOG_VIEW_REF: {
9247 		struct tog_ref_view_state *s = &view->state.ref;
9248 		scrolld = &ref_scroll_down;
9249 		header = 3;
9250 		selected = &s->selected;
9251 		break;
9252 	}
9253 	case TOG_VIEW_TREE: {
9254 		struct tog_tree_view_state *s = &view->state.tree;
9255 		scrolld = &tree_scroll_down;
9256 		header = 5;
9257 		selected = &s->selected;
9258 		break;
9259 	}
9260 	default:
9261 		selected = NULL;
9262 		scrolld = NULL;
9263 		header = 0;
9264 		break;
9265 	}
9266 
9267 	if (selected && *selected > view->nlines - header) {
9268 		offset = abs(view->nlines - *selected - header);
9269 		view->offset = offset;
9270 		if (scrolld && offset) {
9271 			err = scrolld(view, offset);
9272 			*selected -= offset;
9273 		}
9274 	}
9275 
9276 	return err;
9277 }
9278 
9279 static void
9280 list_commands(FILE *fp)
9281 {
9282 	size_t i;
9283 
9284 	fprintf(fp, "commands:");
9285 	for (i = 0; i < nitems(tog_commands); i++) {
9286 		const struct tog_cmd *cmd = &tog_commands[i];
9287 		fprintf(fp, " %s", cmd->name);
9288 	}
9289 	fputc('\n', fp);
9290 }
9291 
9292 __dead static void
9293 usage(int hflag, int status)
9294 {
9295 	FILE *fp = (status == 0) ? stdout : stderr;
9296 
9297 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9298 	    getprogname());
9299 	if (hflag) {
9300 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9301 		list_commands(fp);
9302 	}
9303 	exit(status);
9304 }
9305 
9306 static char **
9307 make_argv(int argc, ...)
9308 {
9309 	va_list ap;
9310 	char **argv;
9311 	int i;
9312 
9313 	va_start(ap, argc);
9314 
9315 	argv = calloc(argc, sizeof(char *));
9316 	if (argv == NULL)
9317 		err(1, "calloc");
9318 	for (i = 0; i < argc; i++) {
9319 		argv[i] = strdup(va_arg(ap, char *));
9320 		if (argv[i] == NULL)
9321 			err(1, "strdup");
9322 	}
9323 
9324 	va_end(ap);
9325 	return argv;
9326 }
9327 
9328 /*
9329  * Try to convert 'tog path' into a 'tog log path' command.
9330  * The user could simply have mistyped the command rather than knowingly
9331  * provided a path. So check whether argv[0] can in fact be resolved
9332  * to a path in the HEAD commit and print a special error if not.
9333  * This hack is for mpi@ <3
9334  */
9335 static const struct got_error *
9336 tog_log_with_path(int argc, char *argv[])
9337 {
9338 	const struct got_error *error = NULL, *close_err;
9339 	const struct tog_cmd *cmd = NULL;
9340 	struct got_repository *repo = NULL;
9341 	struct got_worktree *worktree = NULL;
9342 	struct got_object_id *commit_id = NULL, *id = NULL;
9343 	struct got_commit_object *commit = NULL;
9344 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9345 	char *commit_id_str = NULL, **cmd_argv = NULL;
9346 	int *pack_fds = NULL;
9347 
9348 	cwd = getcwd(NULL, 0);
9349 	if (cwd == NULL)
9350 		return got_error_from_errno("getcwd");
9351 
9352 	error = got_repo_pack_fds_open(&pack_fds);
9353 	if (error != NULL)
9354 		goto done;
9355 
9356 	error = got_worktree_open(&worktree, cwd);
9357 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9358 		goto done;
9359 
9360 	if (worktree)
9361 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9362 	else
9363 		repo_path = strdup(cwd);
9364 	if (repo_path == NULL) {
9365 		error = got_error_from_errno("strdup");
9366 		goto done;
9367 	}
9368 
9369 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9370 	if (error != NULL)
9371 		goto done;
9372 
9373 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9374 	    repo, worktree);
9375 	if (error)
9376 		goto done;
9377 
9378 	error = tog_load_refs(repo, 0);
9379 	if (error)
9380 		goto done;
9381 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9382 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9383 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9384 	if (error)
9385 		goto done;
9386 
9387 	if (worktree) {
9388 		got_worktree_close(worktree);
9389 		worktree = NULL;
9390 	}
9391 
9392 	error = got_object_open_as_commit(&commit, repo, commit_id);
9393 	if (error)
9394 		goto done;
9395 
9396 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9397 	if (error) {
9398 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9399 			goto done;
9400 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9401 		    getprogname(), argv[0]);
9402 		usage(1, 1);
9403 		/* not reached */
9404 	}
9405 
9406 	error = got_object_id_str(&commit_id_str, commit_id);
9407 	if (error)
9408 		goto done;
9409 
9410 	cmd = &tog_commands[0]; /* log */
9411 	argc = 4;
9412 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9413 	error = cmd->cmd_main(argc, cmd_argv);
9414 done:
9415 	if (repo) {
9416 		close_err = got_repo_close(repo);
9417 		if (error == NULL)
9418 			error = close_err;
9419 	}
9420 	if (commit)
9421 		got_object_commit_close(commit);
9422 	if (worktree)
9423 		got_worktree_close(worktree);
9424 	if (pack_fds) {
9425 		const struct got_error *pack_err =
9426 		    got_repo_pack_fds_close(pack_fds);
9427 		if (error == NULL)
9428 			error = pack_err;
9429 	}
9430 	free(id);
9431 	free(commit_id_str);
9432 	free(commit_id);
9433 	free(cwd);
9434 	free(repo_path);
9435 	free(in_repo_path);
9436 	if (cmd_argv) {
9437 		int i;
9438 		for (i = 0; i < argc; i++)
9439 			free(cmd_argv[i]);
9440 		free(cmd_argv);
9441 	}
9442 	tog_free_refs();
9443 	return error;
9444 }
9445 
9446 int
9447 main(int argc, char *argv[])
9448 {
9449 	const struct got_error *error = NULL;
9450 	const struct tog_cmd *cmd = NULL;
9451 	int ch, hflag = 0, Vflag = 0;
9452 	char **cmd_argv = NULL;
9453 	static const struct option longopts[] = {
9454 	    { "version", no_argument, NULL, 'V' },
9455 	    { NULL, 0, NULL, 0}
9456 	};
9457 	char *diff_algo_str = NULL;
9458 
9459 	setlocale(LC_CTYPE, "");
9460 
9461 #ifndef PROFILE
9462 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9463 	    NULL) == -1)
9464 		err(1, "pledge");
9465 #endif
9466 
9467 	if (!isatty(STDIN_FILENO))
9468 		errx(1, "standard input is not a tty");
9469 
9470 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9471 		switch (ch) {
9472 		case 'h':
9473 			hflag = 1;
9474 			break;
9475 		case 'V':
9476 			Vflag = 1;
9477 			break;
9478 		default:
9479 			usage(hflag, 1);
9480 			/* NOTREACHED */
9481 		}
9482 	}
9483 
9484 	argc -= optind;
9485 	argv += optind;
9486 	optind = 1;
9487 	optreset = 1;
9488 
9489 	if (Vflag) {
9490 		got_version_print_str();
9491 		return 0;
9492 	}
9493 
9494 	if (argc == 0) {
9495 		if (hflag)
9496 			usage(hflag, 0);
9497 		/* Build an argument vector which runs a default command. */
9498 		cmd = &tog_commands[0];
9499 		argc = 1;
9500 		cmd_argv = make_argv(argc, cmd->name);
9501 	} else {
9502 		size_t i;
9503 
9504 		/* Did the user specify a command? */
9505 		for (i = 0; i < nitems(tog_commands); i++) {
9506 			if (strncmp(tog_commands[i].name, argv[0],
9507 			    strlen(argv[0])) == 0) {
9508 				cmd = &tog_commands[i];
9509 				break;
9510 			}
9511 		}
9512 	}
9513 
9514 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9515 	if (diff_algo_str) {
9516 		if (strcasecmp(diff_algo_str, "patience") == 0)
9517 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9518 		if (strcasecmp(diff_algo_str, "myers") == 0)
9519 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9520 	}
9521 
9522 	if (cmd == NULL) {
9523 		if (argc != 1)
9524 			usage(0, 1);
9525 		/* No command specified; try log with a path */
9526 		error = tog_log_with_path(argc, argv);
9527 	} else {
9528 		if (hflag)
9529 			cmd->cmd_usage();
9530 		else
9531 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9532 	}
9533 
9534 	endwin();
9535 	if (cmd_argv) {
9536 		int i;
9537 		for (i = 0; i < argc; i++)
9538 			free(cmd_argv[i]);
9539 		free(cmd_argv);
9540 	}
9541 
9542 	if (error && error->code != GOT_ERR_CANCELLED &&
9543 	    error->code != GOT_ERR_EOF &&
9544 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9545 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9546 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9547 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9548 	return 0;
9549 }