1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 	TOG_VIEW_HELP
107 };
108 
109 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
110 enum tog_keymap_type {
111 	TOG_KEYMAP_KEYS = -2,
112 	TOG_KEYMAP_GLOBAL,
113 	TOG_KEYMAP_DIFF,
114 	TOG_KEYMAP_LOG,
115 	TOG_KEYMAP_BLAME,
116 	TOG_KEYMAP_TREE,
117 	TOG_KEYMAP_REF,
118 	TOG_KEYMAP_HELP
119 };
120 
121 enum tog_view_mode {
122 	TOG_VIEW_SPLIT_NONE,
123 	TOG_VIEW_SPLIT_VERT,
124 	TOG_VIEW_SPLIT_HRZN
125 };
126 
127 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
128 
129 #define TOG_EOF_STRING	"(END)"
130 
131 struct commit_queue_entry {
132 	TAILQ_ENTRY(commit_queue_entry) entry;
133 	struct got_object_id *id;
134 	struct got_commit_object *commit;
135 	int idx;
136 };
137 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
138 struct commit_queue {
139 	int ncommits;
140 	struct commit_queue_head head;
141 };
142 
143 struct tog_color {
144 	STAILQ_ENTRY(tog_color) entry;
145 	regex_t regex;
146 	short colorpair;
147 };
148 STAILQ_HEAD(tog_colors, tog_color);
149 
150 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
151 static struct got_reflist_object_id_map *tog_refs_idmap;
152 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
153 
154 static const struct got_error *
155 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
156     struct got_reference* re2)
157 {
158 	const char *name1 = got_ref_get_name(re1);
159 	const char *name2 = got_ref_get_name(re2);
160 	int isbackup1, isbackup2;
161 
162 	/* Sort backup refs towards the bottom of the list. */
163 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
164 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
165 	if (!isbackup1 && isbackup2) {
166 		*cmp = -1;
167 		return NULL;
168 	} else if (isbackup1 && !isbackup2) {
169 		*cmp = 1;
170 		return NULL;
171 	}
172 
173 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 tog_load_refs(struct got_repository *repo, int sort_by_date)
179 {
180 	const struct got_error *err;
181 
182 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
183 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
184 	    repo);
185 	if (err)
186 		return err;
187 
188 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
189 	    repo);
190 }
191 
192 static void
193 tog_free_refs(void)
194 {
195 	if (tog_refs_idmap) {
196 		got_reflist_object_id_map_free(tog_refs_idmap);
197 		tog_refs_idmap = NULL;
198 	}
199 	got_ref_list_free(&tog_refs);
200 }
201 
202 static const struct got_error *
203 add_color(struct tog_colors *colors, const char *pattern,
204     int idx, short color)
205 {
206 	const struct got_error *err = NULL;
207 	struct tog_color *tc;
208 	int regerr = 0;
209 
210 	if (idx < 1 || idx > COLOR_PAIRS - 1)
211 		return NULL;
212 
213 	init_pair(idx, color, -1);
214 
215 	tc = calloc(1, sizeof(*tc));
216 	if (tc == NULL)
217 		return got_error_from_errno("calloc");
218 	regerr = regcomp(&tc->regex, pattern,
219 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
220 	if (regerr) {
221 		static char regerr_msg[512];
222 		static char err_msg[512];
223 		regerror(regerr, &tc->regex, regerr_msg,
224 		    sizeof(regerr_msg));
225 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
226 		    regerr_msg);
227 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
228 		free(tc);
229 		return err;
230 	}
231 	tc->colorpair = idx;
232 	STAILQ_INSERT_HEAD(colors, tc, entry);
233 	return NULL;
234 }
235 
236 static void
237 free_colors(struct tog_colors *colors)
238 {
239 	struct tog_color *tc;
240 
241 	while (!STAILQ_EMPTY(colors)) {
242 		tc = STAILQ_FIRST(colors);
243 		STAILQ_REMOVE_HEAD(colors, entry);
244 		regfree(&tc->regex);
245 		free(tc);
246 	}
247 }
248 
249 static struct tog_color *
250 get_color(struct tog_colors *colors, int colorpair)
251 {
252 	struct tog_color *tc = NULL;
253 
254 	STAILQ_FOREACH(tc, colors, entry) {
255 		if (tc->colorpair == colorpair)
256 			return tc;
257 	}
258 
259 	return NULL;
260 }
261 
262 static int
263 default_color_value(const char *envvar)
264 {
265 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
268 		return COLOR_CYAN;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
274 		return COLOR_MAGENTA;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
278 		return COLOR_CYAN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
286 		return COLOR_YELLOW;
287 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
290 		return COLOR_MAGENTA;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
294 		return COLOR_CYAN;
295 
296 	return -1;
297 }
298 
299 static int
300 get_color_value(const char *envvar)
301 {
302 	const char *val = getenv(envvar);
303 
304 	if (val == NULL)
305 		return default_color_value(envvar);
306 
307 	if (strcasecmp(val, "black") == 0)
308 		return COLOR_BLACK;
309 	if (strcasecmp(val, "red") == 0)
310 		return COLOR_RED;
311 	if (strcasecmp(val, "green") == 0)
312 		return COLOR_GREEN;
313 	if (strcasecmp(val, "yellow") == 0)
314 		return COLOR_YELLOW;
315 	if (strcasecmp(val, "blue") == 0)
316 		return COLOR_BLUE;
317 	if (strcasecmp(val, "magenta") == 0)
318 		return COLOR_MAGENTA;
319 	if (strcasecmp(val, "cyan") == 0)
320 		return COLOR_CYAN;
321 	if (strcasecmp(val, "white") == 0)
322 		return COLOR_WHITE;
323 	if (strcasecmp(val, "default") == 0)
324 		return -1;
325 
326 	return default_color_value(envvar);
327 }
328 
329 struct tog_diff_view_state {
330 	struct got_object_id *id1, *id2;
331 	const char *label1, *label2;
332 	FILE *f, *f1, *f2;
333 	int fd1, fd2;
334 	int lineno;
335 	int first_displayed_line;
336 	int last_displayed_line;
337 	int eof;
338 	int diff_context;
339 	int ignore_whitespace;
340 	int force_text_diff;
341 	struct got_repository *repo;
342 	struct got_diff_line *lines;
343 	size_t nlines;
344 	int matched_line;
345 	int selected_line;
346 
347 	/* passed from log or blame view; may be NULL */
348 	struct tog_view *parent_view;
349 };
350 
351 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
352 static volatile sig_atomic_t tog_thread_error;
353 
354 struct tog_log_thread_args {
355 	pthread_cond_t need_commits;
356 	pthread_cond_t commit_loaded;
357 	int commits_needed;
358 	int load_all;
359 	struct got_commit_graph *graph;
360 	struct commit_queue *real_commits;
361 	const char *in_repo_path;
362 	struct got_object_id *start_id;
363 	struct got_repository *repo;
364 	int *pack_fds;
365 	int log_complete;
366 	sig_atomic_t *quit;
367 	struct commit_queue_entry **first_displayed_entry;
368 	struct commit_queue_entry **selected_entry;
369 	int *searching;
370 	int *search_next_done;
371 	regex_t *regex;
372 	int *limiting;
373 	int limit_match;
374 	regex_t *limit_regex;
375 	struct commit_queue *limit_commits;
376 };
377 
378 struct tog_log_view_state {
379 	struct commit_queue *commits;
380 	struct commit_queue_entry *first_displayed_entry;
381 	struct commit_queue_entry *last_displayed_entry;
382 	struct commit_queue_entry *selected_entry;
383 	struct commit_queue real_commits;
384 	int selected;
385 	char *in_repo_path;
386 	char *head_ref_name;
387 	int log_branches;
388 	struct got_repository *repo;
389 	struct got_object_id *start_id;
390 	sig_atomic_t quit;
391 	pthread_t thread;
392 	struct tog_log_thread_args thread_args;
393 	struct commit_queue_entry *matched_entry;
394 	struct commit_queue_entry *search_entry;
395 	struct tog_colors colors;
396 	int use_committer;
397 	int limit_view;
398 	regex_t limit_regex;
399 	struct commit_queue limit_commits;
400 };
401 
402 #define TOG_COLOR_DIFF_MINUS		1
403 #define TOG_COLOR_DIFF_PLUS		2
404 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
405 #define TOG_COLOR_DIFF_META		4
406 #define TOG_COLOR_TREE_SUBMODULE	5
407 #define TOG_COLOR_TREE_SYMLINK		6
408 #define TOG_COLOR_TREE_DIRECTORY	7
409 #define TOG_COLOR_TREE_EXECUTABLE	8
410 #define TOG_COLOR_COMMIT		9
411 #define TOG_COLOR_AUTHOR		10
412 #define TOG_COLOR_DATE			11
413 #define TOG_COLOR_REFS_HEADS		12
414 #define TOG_COLOR_REFS_TAGS		13
415 #define TOG_COLOR_REFS_REMOTES		14
416 #define TOG_COLOR_REFS_BACKUP		15
417 
418 struct tog_blame_cb_args {
419 	struct tog_blame_line *lines; /* one per line */
420 	int nlines;
421 
422 	struct tog_view *view;
423 	struct got_object_id *commit_id;
424 	int *quit;
425 };
426 
427 struct tog_blame_thread_args {
428 	const char *path;
429 	struct got_repository *repo;
430 	struct tog_blame_cb_args *cb_args;
431 	int *complete;
432 	got_cancel_cb cancel_cb;
433 	void *cancel_arg;
434 };
435 
436 struct tog_blame {
437 	FILE *f;
438 	off_t filesize;
439 	struct tog_blame_line *lines;
440 	int nlines;
441 	off_t *line_offsets;
442 	pthread_t thread;
443 	struct tog_blame_thread_args thread_args;
444 	struct tog_blame_cb_args cb_args;
445 	const char *path;
446 	int *pack_fds;
447 };
448 
449 struct tog_blame_view_state {
450 	int first_displayed_line;
451 	int last_displayed_line;
452 	int selected_line;
453 	int last_diffed_line;
454 	int blame_complete;
455 	int eof;
456 	int done;
457 	struct got_object_id_queue blamed_commits;
458 	struct got_object_qid *blamed_commit;
459 	char *path;
460 	struct got_repository *repo;
461 	struct got_object_id *commit_id;
462 	struct got_object_id *id_to_log;
463 	struct tog_blame blame;
464 	int matched_line;
465 	struct tog_colors colors;
466 };
467 
468 struct tog_parent_tree {
469 	TAILQ_ENTRY(tog_parent_tree) entry;
470 	struct got_tree_object *tree;
471 	struct got_tree_entry *first_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int selected;
474 };
475 
476 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
477 
478 struct tog_tree_view_state {
479 	char *tree_label;
480 	struct got_object_id *commit_id;/* commit which this tree belongs to */
481 	struct got_tree_object *root;	/* the commit's root tree entry */
482 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
483 	struct got_tree_entry *first_displayed_entry;
484 	struct got_tree_entry *last_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int ndisplayed, selected, show_ids;
487 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
488 	char *head_ref_name;
489 	struct got_repository *repo;
490 	struct got_tree_entry *matched_entry;
491 	struct tog_colors colors;
492 };
493 
494 struct tog_reflist_entry {
495 	TAILQ_ENTRY(tog_reflist_entry) entry;
496 	struct got_reference *ref;
497 	int idx;
498 };
499 
500 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
501 
502 struct tog_ref_view_state {
503 	struct tog_reflist_head refs;
504 	struct tog_reflist_entry *first_displayed_entry;
505 	struct tog_reflist_entry *last_displayed_entry;
506 	struct tog_reflist_entry *selected_entry;
507 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
508 	struct got_repository *repo;
509 	struct tog_reflist_entry *matched_entry;
510 	struct tog_colors colors;
511 };
512 
513 struct tog_help_view_state {
514 	FILE			*f;
515 	off_t			*line_offsets;
516 	size_t			 nlines;
517 	int			 lineno;
518 	int			 first_displayed_line;
519 	int			 last_displayed_line;
520 	int			 eof;
521 	int			 matched_line;
522 	int			 selected_line;
523 	int			 all;
524 	enum tog_keymap_type	 type;
525 };
526 
527 #define GENERATE_HELP \
528 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
529 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
530 	KEY_("k C-p Up", "Move cursor or page up one line"), \
531 	KEY_("j C-n Down", "Move cursor or page down one line"), \
532 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
533 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
534 	KEY_("C-u u", "Scroll the view up one half page"), \
535 	KEY_("C-d d", "Scroll the view down one half page"), \
536 	KEY_("g", "Go to line N (default: first line)"), \
537 	KEY_("Home =", "Go to the first line"), \
538 	KEY_("G", "Go to line N (default: last line)"), \
539 	KEY_("End *", "Go to the last line"), \
540 	KEY_("l Right", "Scroll the view right"), \
541 	KEY_("h Left", "Scroll the view left"), \
542 	KEY_("$", "Scroll view to the rightmost position"), \
543 	KEY_("0", "Scroll view to the leftmost position"), \
544 	KEY_("-", "Decrease size of the focussed split"), \
545 	KEY_("+", "Increase size of the focussed split"), \
546 	KEY_("Tab", "Switch focus between views"), \
547 	KEY_("F", "Toggle fullscreen mode"), \
548 	KEY_("/", "Open prompt to enter search term"), \
549 	KEY_("n", "Find next line/token matching the current search term"), \
550 	KEY_("N", "Find previous line/token matching the current search term"),\
551 	KEY_("q", "Quit the focussed view; Quit help screen"), \
552 	KEY_("Q", "Quit tog"), \
553 	\
554 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
555 	KEY_("< ,", "Move cursor up one commit"), \
556 	KEY_("> .", "Move cursor down one commit"), \
557 	KEY_("Enter", "Open diff view of the selected commit"), \
558 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
559 	KEY_("R", "Open ref view of all repository references"), \
560 	KEY_("T", "Display tree view of the repository from the selected" \
561 	    " commit"), \
562 	KEY_("@", "Toggle between displaying author and committer name"), \
563 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
564 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
565 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
566 	\
567 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
568 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
569 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
570 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
571 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
572 	    " data"), \
573 	KEY_("(", "Go to the previous file in the diff"), \
574 	KEY_(")", "Go to the next file in the diff"), \
575 	KEY_("{", "Go to the previous hunk in the diff"), \
576 	KEY_("}", "Go to the next hunk in the diff"), \
577 	KEY_("[", "Decrease the number of context lines"), \
578 	KEY_("]", "Increase the number of context lines"), \
579 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
580 	\
581 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
582 	KEY_("Enter", "Display diff view of the selected line's commit"), \
583 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
584 	KEY_("L", "Open log view for the currently selected annotated line"), \
585 	KEY_("C", "Reload view with the previously blamed commit"), \
586 	KEY_("c", "Reload view with the version of the file found in the" \
587 	    " selected line's commit"), \
588 	KEY_("p", "Reload view with the version of the file found in the" \
589 	    " selected line's parent commit"), \
590 	\
591 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
592 	KEY_("Enter", "Enter selected directory or open blame view of the" \
593 	    " selected file"), \
594 	KEY_("L", "Open log view for the selected entry"), \
595 	KEY_("R", "Open ref view of all repository references"), \
596 	KEY_("i", "Show object IDs for all tree entries"), \
597 	KEY_("Backspace", "Return to the parent directory"), \
598 	\
599 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
600 	KEY_("Enter", "Display log view of the selected reference"), \
601 	KEY_("T", "Display tree view of the selected reference"), \
602 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
603 	KEY_("m", "Toggle display of last modified date for each reference"), \
604 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
605 	KEY_("C-l", "Reload view with all repository references")
606 
607 struct tog_key_map {
608 	const char		*keys;
609 	const char		*info;
610 	enum tog_keymap_type	 type;
611 };
612 
613 /*
614  * We implement two types of views: parent views and child views.
615  *
616  * The 'Tab' key switches focus between a parent view and its child view.
617  * Child views are shown side-by-side to their parent view, provided
618  * there is enough screen estate.
619  *
620  * When a new view is opened from within a parent view, this new view
621  * becomes a child view of the parent view, replacing any existing child.
622  *
623  * When a new view is opened from within a child view, this new view
624  * becomes a parent view which will obscure the views below until the
625  * user quits the new parent view by typing 'q'.
626  *
627  * This list of views contains parent views only.
628  * Child views are only pointed to by their parent view.
629  */
630 TAILQ_HEAD(tog_view_list_head, tog_view);
631 
632 struct tog_view {
633 	TAILQ_ENTRY(tog_view) entry;
634 	WINDOW *window;
635 	PANEL *panel;
636 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
637 	int resized_y, resized_x; /* begin_y/x based on user resizing */
638 	int maxx, x; /* max column and current start column */
639 	int lines, cols; /* copies of LINES and COLS */
640 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
641 	int gline, hiline; /* navigate to and highlight this nG line */
642 	int ch, count; /* current keymap and count prefix */
643 	int resized; /* set when in a resize event */
644 	int focussed; /* Only set on one parent or child view at a time. */
645 	int dying;
646 	struct tog_view *parent;
647 	struct tog_view *child;
648 
649 	/*
650 	 * This flag is initially set on parent views when a new child view
651 	 * is created. It gets toggled when the 'Tab' key switches focus
652 	 * between parent and child.
653 	 * The flag indicates whether focus should be passed on to our child
654 	 * view if this parent view gets picked for focus after another parent
655 	 * view was closed. This prevents child views from losing focus in such
656 	 * situations.
657 	 */
658 	int focus_child;
659 
660 	enum tog_view_mode mode;
661 	/* type-specific state */
662 	enum tog_view_type type;
663 	union {
664 		struct tog_diff_view_state diff;
665 		struct tog_log_view_state log;
666 		struct tog_blame_view_state blame;
667 		struct tog_tree_view_state tree;
668 		struct tog_ref_view_state ref;
669 		struct tog_help_view_state help;
670 	} state;
671 
672 	const struct got_error *(*show)(struct tog_view *);
673 	const struct got_error *(*input)(struct tog_view **,
674 	    struct tog_view *, int);
675 	const struct got_error *(*reset)(struct tog_view *);
676 	const struct got_error *(*resize)(struct tog_view *, int);
677 	const struct got_error *(*close)(struct tog_view *);
678 
679 	const struct got_error *(*search_start)(struct tog_view *);
680 	const struct got_error *(*search_next)(struct tog_view *);
681 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
682 	    int **, int **, int **, int **);
683 	int search_started;
684 	int searching;
685 #define TOG_SEARCH_FORWARD	1
686 #define TOG_SEARCH_BACKWARD	2
687 	int search_next_done;
688 #define TOG_SEARCH_HAVE_MORE	1
689 #define TOG_SEARCH_NO_MORE	2
690 #define TOG_SEARCH_HAVE_NONE	3
691 	regex_t regex;
692 	regmatch_t regmatch;
693 	const char *action;
694 };
695 
696 static const struct got_error *open_diff_view(struct tog_view *,
697     struct got_object_id *, struct got_object_id *,
698     const char *, const char *, int, int, int, struct tog_view *,
699     struct got_repository *);
700 static const struct got_error *show_diff_view(struct tog_view *);
701 static const struct got_error *input_diff_view(struct tog_view **,
702     struct tog_view *, int);
703 static const struct got_error *reset_diff_view(struct tog_view *);
704 static const struct got_error* close_diff_view(struct tog_view *);
705 static const struct got_error *search_start_diff_view(struct tog_view *);
706 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
707     size_t *, int **, int **, int **, int **);
708 static const struct got_error *search_next_view_match(struct tog_view *);
709 
710 static const struct got_error *open_log_view(struct tog_view *,
711     struct got_object_id *, struct got_repository *,
712     const char *, const char *, int);
713 static const struct got_error * show_log_view(struct tog_view *);
714 static const struct got_error *input_log_view(struct tog_view **,
715     struct tog_view *, int);
716 static const struct got_error *resize_log_view(struct tog_view *, int);
717 static const struct got_error *close_log_view(struct tog_view *);
718 static const struct got_error *search_start_log_view(struct tog_view *);
719 static const struct got_error *search_next_log_view(struct tog_view *);
720 
721 static const struct got_error *open_blame_view(struct tog_view *, char *,
722     struct got_object_id *, struct got_repository *);
723 static const struct got_error *show_blame_view(struct tog_view *);
724 static const struct got_error *input_blame_view(struct tog_view **,
725     struct tog_view *, int);
726 static const struct got_error *reset_blame_view(struct tog_view *);
727 static const struct got_error *close_blame_view(struct tog_view *);
728 static const struct got_error *search_start_blame_view(struct tog_view *);
729 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
730     size_t *, int **, int **, int **, int **);
731 
732 static const struct got_error *open_tree_view(struct tog_view *,
733     struct got_object_id *, const char *, struct got_repository *);
734 static const struct got_error *show_tree_view(struct tog_view *);
735 static const struct got_error *input_tree_view(struct tog_view **,
736     struct tog_view *, int);
737 static const struct got_error *close_tree_view(struct tog_view *);
738 static const struct got_error *search_start_tree_view(struct tog_view *);
739 static const struct got_error *search_next_tree_view(struct tog_view *);
740 
741 static const struct got_error *open_ref_view(struct tog_view *,
742     struct got_repository *);
743 static const struct got_error *show_ref_view(struct tog_view *);
744 static const struct got_error *input_ref_view(struct tog_view **,
745     struct tog_view *, int);
746 static const struct got_error *close_ref_view(struct tog_view *);
747 static const struct got_error *search_start_ref_view(struct tog_view *);
748 static const struct got_error *search_next_ref_view(struct tog_view *);
749 
750 static const struct got_error *open_help_view(struct tog_view *,
751     struct tog_view *);
752 static const struct got_error *show_help_view(struct tog_view *);
753 static const struct got_error *input_help_view(struct tog_view **,
754     struct tog_view *, int);
755 static const struct got_error *reset_help_view(struct tog_view *);
756 static const struct got_error* close_help_view(struct tog_view *);
757 static const struct got_error *search_start_help_view(struct tog_view *);
758 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
759     size_t *, int **, int **, int **, int **);
760 
761 static volatile sig_atomic_t tog_sigwinch_received;
762 static volatile sig_atomic_t tog_sigpipe_received;
763 static volatile sig_atomic_t tog_sigcont_received;
764 static volatile sig_atomic_t tog_sigint_received;
765 static volatile sig_atomic_t tog_sigterm_received;
766 
767 static void
768 tog_sigwinch(int signo)
769 {
770 	tog_sigwinch_received = 1;
771 }
772 
773 static void
774 tog_sigpipe(int signo)
775 {
776 	tog_sigpipe_received = 1;
777 }
778 
779 static void
780 tog_sigcont(int signo)
781 {
782 	tog_sigcont_received = 1;
783 }
784 
785 static void
786 tog_sigint(int signo)
787 {
788 	tog_sigint_received = 1;
789 }
790 
791 static void
792 tog_sigterm(int signo)
793 {
794 	tog_sigterm_received = 1;
795 }
796 
797 static int
798 tog_fatal_signal_received(void)
799 {
800 	return (tog_sigpipe_received ||
801 	    tog_sigint_received || tog_sigterm_received);
802 }
803 
804 static const struct got_error *
805 view_close(struct tog_view *view)
806 {
807 	const struct got_error *err = NULL, *child_err = NULL;
808 
809 	if (view->child) {
810 		child_err = view_close(view->child);
811 		view->child = NULL;
812 	}
813 	if (view->close)
814 		err = view->close(view);
815 	if (view->panel)
816 		del_panel(view->panel);
817 	if (view->window)
818 		delwin(view->window);
819 	free(view);
820 	return err ? err : child_err;
821 }
822 
823 static struct tog_view *
824 view_open(int nlines, int ncols, int begin_y, int begin_x,
825     enum tog_view_type type)
826 {
827 	struct tog_view *view = calloc(1, sizeof(*view));
828 
829 	if (view == NULL)
830 		return NULL;
831 
832 	view->type = type;
833 	view->lines = LINES;
834 	view->cols = COLS;
835 	view->nlines = nlines ? nlines : LINES - begin_y;
836 	view->ncols = ncols ? ncols : COLS - begin_x;
837 	view->begin_y = begin_y;
838 	view->begin_x = begin_x;
839 	view->window = newwin(nlines, ncols, begin_y, begin_x);
840 	if (view->window == NULL) {
841 		view_close(view);
842 		return NULL;
843 	}
844 	view->panel = new_panel(view->window);
845 	if (view->panel == NULL ||
846 	    set_panel_userptr(view->panel, view) != OK) {
847 		view_close(view);
848 		return NULL;
849 	}
850 
851 	keypad(view->window, TRUE);
852 	return view;
853 }
854 
855 static int
856 view_split_begin_x(int begin_x)
857 {
858 	if (begin_x > 0 || COLS < 120)
859 		return 0;
860 	return (COLS - MAX(COLS / 2, 80));
861 }
862 
863 /* XXX Stub till we decide what to do. */
864 static int
865 view_split_begin_y(int lines)
866 {
867 	return lines * HSPLIT_SCALE;
868 }
869 
870 static const struct got_error *view_resize(struct tog_view *);
871 
872 static const struct got_error *
873 view_splitscreen(struct tog_view *view)
874 {
875 	const struct got_error *err = NULL;
876 
877 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
878 		if (view->resized_y && view->resized_y < view->lines)
879 			view->begin_y = view->resized_y;
880 		else
881 			view->begin_y = view_split_begin_y(view->nlines);
882 		view->begin_x = 0;
883 	} else if (!view->resized) {
884 		if (view->resized_x && view->resized_x < view->cols - 1 &&
885 		    view->cols > 119)
886 			view->begin_x = view->resized_x;
887 		else
888 			view->begin_x = view_split_begin_x(0);
889 		view->begin_y = 0;
890 	}
891 	view->nlines = LINES - view->begin_y;
892 	view->ncols = COLS - view->begin_x;
893 	view->lines = LINES;
894 	view->cols = COLS;
895 	err = view_resize(view);
896 	if (err)
897 		return err;
898 
899 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
900 		view->parent->nlines = view->begin_y;
901 
902 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
903 		return got_error_from_errno("mvwin");
904 
905 	return NULL;
906 }
907 
908 static const struct got_error *
909 view_fullscreen(struct tog_view *view)
910 {
911 	const struct got_error *err = NULL;
912 
913 	view->begin_x = 0;
914 	view->begin_y = view->resized ? view->begin_y : 0;
915 	view->nlines = view->resized ? view->nlines : LINES;
916 	view->ncols = COLS;
917 	view->lines = LINES;
918 	view->cols = COLS;
919 	err = view_resize(view);
920 	if (err)
921 		return err;
922 
923 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
924 		return got_error_from_errno("mvwin");
925 
926 	return NULL;
927 }
928 
929 static int
930 view_is_parent_view(struct tog_view *view)
931 {
932 	return view->parent == NULL;
933 }
934 
935 static int
936 view_is_splitscreen(struct tog_view *view)
937 {
938 	return view->begin_x > 0 || view->begin_y > 0;
939 }
940 
941 static int
942 view_is_fullscreen(struct tog_view *view)
943 {
944 	return view->nlines == LINES && view->ncols == COLS;
945 }
946 
947 static int
948 view_is_hsplit_top(struct tog_view *view)
949 {
950 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
951 	    view_is_splitscreen(view->child);
952 }
953 
954 static void
955 view_border(struct tog_view *view)
956 {
957 	PANEL *panel;
958 	const struct tog_view *view_above;
959 
960 	if (view->parent)
961 		return view_border(view->parent);
962 
963 	panel = panel_above(view->panel);
964 	if (panel == NULL)
965 		return;
966 
967 	view_above = panel_userptr(panel);
968 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
969 		mvwhline(view->window, view_above->begin_y - 1,
970 		    view->begin_x, got_locale_is_utf8() ?
971 		    ACS_HLINE : '-', view->ncols);
972 	else
973 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
974 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
975 }
976 
977 static const struct got_error *view_init_hsplit(struct tog_view *, int);
978 static const struct got_error *request_log_commits(struct tog_view *);
979 static const struct got_error *offset_selection_down(struct tog_view *);
980 static void offset_selection_up(struct tog_view *);
981 static void view_get_split(struct tog_view *, int *, int *);
982 
983 static const struct got_error *
984 view_resize(struct tog_view *view)
985 {
986 	const struct got_error	*err = NULL;
987 	int			 dif, nlines, ncols;
988 
989 	dif = LINES - view->lines;  /* line difference */
990 
991 	if (view->lines > LINES)
992 		nlines = view->nlines - (view->lines - LINES);
993 	else
994 		nlines = view->nlines + (LINES - view->lines);
995 	if (view->cols > COLS)
996 		ncols = view->ncols - (view->cols - COLS);
997 	else
998 		ncols = view->ncols + (COLS - view->cols);
999 
1000 	if (view->child) {
1001 		int hs = view->child->begin_y;
1002 
1003 		if (!view_is_fullscreen(view))
1004 			view->child->begin_x = view_split_begin_x(view->begin_x);
1005 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1006 		    view->child->begin_x == 0) {
1007 			ncols = COLS;
1008 
1009 			view_fullscreen(view->child);
1010 			if (view->child->focussed)
1011 				show_panel(view->child->panel);
1012 			else
1013 				show_panel(view->panel);
1014 		} else {
1015 			ncols = view->child->begin_x;
1016 
1017 			view_splitscreen(view->child);
1018 			show_panel(view->child->panel);
1019 		}
1020 		/*
1021 		 * XXX This is ugly and needs to be moved into the above
1022 		 * logic but "works" for now and my attempts at moving it
1023 		 * break either 'tab' or 'F' key maps in horizontal splits.
1024 		 */
1025 		if (hs) {
1026 			err = view_splitscreen(view->child);
1027 			if (err)
1028 				return err;
1029 			if (dif < 0) { /* top split decreased */
1030 				err = offset_selection_down(view);
1031 				if (err)
1032 					return err;
1033 			}
1034 			view_border(view);
1035 			update_panels();
1036 			doupdate();
1037 			show_panel(view->child->panel);
1038 			nlines = view->nlines;
1039 		}
1040 	} else if (view->parent == NULL)
1041 		ncols = COLS;
1042 
1043 	if (view->resize && dif > 0) {
1044 		err = view->resize(view, dif);
1045 		if (err)
1046 			return err;
1047 	}
1048 
1049 	if (wresize(view->window, nlines, ncols) == ERR)
1050 		return got_error_from_errno("wresize");
1051 	if (replace_panel(view->panel, view->window) == ERR)
1052 		return got_error_from_errno("replace_panel");
1053 	wclear(view->window);
1054 
1055 	view->nlines = nlines;
1056 	view->ncols = ncols;
1057 	view->lines = LINES;
1058 	view->cols = COLS;
1059 
1060 	return NULL;
1061 }
1062 
1063 static const struct got_error *
1064 resize_log_view(struct tog_view *view, int increase)
1065 {
1066 	struct tog_log_view_state	*s = &view->state.log;
1067 	const struct got_error		*err = NULL;
1068 	int				 n = 0;
1069 
1070 	if (s->selected_entry)
1071 		n = s->selected_entry->idx + view->lines - s->selected;
1072 
1073 	/*
1074 	 * Request commits to account for the increased
1075 	 * height so we have enough to populate the view.
1076 	 */
1077 	if (s->commits->ncommits < n) {
1078 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1079 		err = request_log_commits(view);
1080 	}
1081 
1082 	return err;
1083 }
1084 
1085 static void
1086 view_adjust_offset(struct tog_view *view, int n)
1087 {
1088 	if (n == 0)
1089 		return;
1090 
1091 	if (view->parent && view->parent->offset) {
1092 		if (view->parent->offset + n >= 0)
1093 			view->parent->offset += n;
1094 		else
1095 			view->parent->offset = 0;
1096 	} else if (view->offset) {
1097 		if (view->offset - n >= 0)
1098 			view->offset -= n;
1099 		else
1100 			view->offset = 0;
1101 	}
1102 }
1103 
1104 static const struct got_error *
1105 view_resize_split(struct tog_view *view, int resize)
1106 {
1107 	const struct got_error	*err = NULL;
1108 	struct tog_view		*v = NULL;
1109 
1110 	if (view->parent)
1111 		v = view->parent;
1112 	else
1113 		v = view;
1114 
1115 	if (!v->child || !view_is_splitscreen(v->child))
1116 		return NULL;
1117 
1118 	v->resized = v->child->resized = resize;  /* lock for resize event */
1119 
1120 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1121 		if (v->child->resized_y)
1122 			v->child->begin_y = v->child->resized_y;
1123 		if (view->parent)
1124 			v->child->begin_y -= resize;
1125 		else
1126 			v->child->begin_y += resize;
1127 		if (v->child->begin_y < 3) {
1128 			view->count = 0;
1129 			v->child->begin_y = 3;
1130 		} else if (v->child->begin_y > LINES - 1) {
1131 			view->count = 0;
1132 			v->child->begin_y = LINES - 1;
1133 		}
1134 		v->ncols = COLS;
1135 		v->child->ncols = COLS;
1136 		view_adjust_offset(view, resize);
1137 		err = view_init_hsplit(v, v->child->begin_y);
1138 		if (err)
1139 			return err;
1140 		v->child->resized_y = v->child->begin_y;
1141 	} else {
1142 		if (v->child->resized_x)
1143 			v->child->begin_x = v->child->resized_x;
1144 		if (view->parent)
1145 			v->child->begin_x -= resize;
1146 		else
1147 			v->child->begin_x += resize;
1148 		if (v->child->begin_x < 11) {
1149 			view->count = 0;
1150 			v->child->begin_x = 11;
1151 		} else if (v->child->begin_x > COLS - 1) {
1152 			view->count = 0;
1153 			v->child->begin_x = COLS - 1;
1154 		}
1155 		v->child->resized_x = v->child->begin_x;
1156 	}
1157 
1158 	v->child->mode = v->mode;
1159 	v->child->nlines = v->lines - v->child->begin_y;
1160 	v->child->ncols = v->cols - v->child->begin_x;
1161 	v->focus_child = 1;
1162 
1163 	err = view_fullscreen(v);
1164 	if (err)
1165 		return err;
1166 	err = view_splitscreen(v->child);
1167 	if (err)
1168 		return err;
1169 
1170 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1171 		err = offset_selection_down(v->child);
1172 		if (err)
1173 			return err;
1174 	}
1175 
1176 	if (v->resize)
1177 		err = v->resize(v, 0);
1178 	else if (v->child->resize)
1179 		err = v->child->resize(v->child, 0);
1180 
1181 	v->resized = v->child->resized = 0;
1182 
1183 	return err;
1184 }
1185 
1186 static void
1187 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1188 {
1189 	struct tog_view *v = src->child ? src->child : src;
1190 
1191 	dst->resized_x = v->resized_x;
1192 	dst->resized_y = v->resized_y;
1193 }
1194 
1195 static const struct got_error *
1196 view_close_child(struct tog_view *view)
1197 {
1198 	const struct got_error *err = NULL;
1199 
1200 	if (view->child == NULL)
1201 		return NULL;
1202 
1203 	err = view_close(view->child);
1204 	view->child = NULL;
1205 	return err;
1206 }
1207 
1208 static const struct got_error *
1209 view_set_child(struct tog_view *view, struct tog_view *child)
1210 {
1211 	const struct got_error *err = NULL;
1212 
1213 	view->child = child;
1214 	child->parent = view;
1215 
1216 	err = view_resize(view);
1217 	if (err)
1218 		return err;
1219 
1220 	if (view->child->resized_x || view->child->resized_y)
1221 		err = view_resize_split(view, 0);
1222 
1223 	return err;
1224 }
1225 
1226 static const struct got_error *view_dispatch_request(struct tog_view **,
1227     struct tog_view *, enum tog_view_type, int, int);
1228 
1229 static const struct got_error *
1230 view_request_new(struct tog_view **requested, struct tog_view *view,
1231     enum tog_view_type request)
1232 {
1233 	struct tog_view		*new_view = NULL;
1234 	const struct got_error	*err;
1235 	int			 y = 0, x = 0;
1236 
1237 	*requested = NULL;
1238 
1239 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1240 		view_get_split(view, &y, &x);
1241 
1242 	err = view_dispatch_request(&new_view, view, request, y, x);
1243 	if (err)
1244 		return err;
1245 
1246 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1247 	    request != TOG_VIEW_HELP) {
1248 		err = view_init_hsplit(view, y);
1249 		if (err)
1250 			return err;
1251 	}
1252 
1253 	view->focussed = 0;
1254 	new_view->focussed = 1;
1255 	new_view->mode = view->mode;
1256 	new_view->nlines = request == TOG_VIEW_HELP ?
1257 	    view->lines : view->lines - y;
1258 
1259 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1260 		view_transfer_size(new_view, view);
1261 		err = view_close_child(view);
1262 		if (err)
1263 			return err;
1264 		err = view_set_child(view, new_view);
1265 		if (err)
1266 			return err;
1267 		view->focus_child = 1;
1268 	} else
1269 		*requested = new_view;
1270 
1271 	return NULL;
1272 }
1273 
1274 static void
1275 tog_resizeterm(void)
1276 {
1277 	int cols, lines;
1278 	struct winsize size;
1279 
1280 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1281 		cols = 80;     /* Default */
1282 		lines = 24;
1283 	} else {
1284 		cols = size.ws_col;
1285 		lines = size.ws_row;
1286 	}
1287 	resize_term(lines, cols);
1288 }
1289 
1290 static const struct got_error *
1291 view_search_start(struct tog_view *view, int fast_refresh)
1292 {
1293 	const struct got_error *err = NULL;
1294 	struct tog_view *v = view;
1295 	char pattern[1024];
1296 	int ret;
1297 
1298 	if (view->search_started) {
1299 		regfree(&view->regex);
1300 		view->searching = 0;
1301 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1302 	}
1303 	view->search_started = 0;
1304 
1305 	if (view->nlines < 1)
1306 		return NULL;
1307 
1308 	if (view_is_hsplit_top(view))
1309 		v = view->child;
1310 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1311 		v = view->parent;
1312 
1313 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1314 	wclrtoeol(v->window);
1315 
1316 	nodelay(v->window, FALSE);  /* block for search term input */
1317 	nocbreak();
1318 	echo();
1319 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1320 	wrefresh(v->window);
1321 	cbreak();
1322 	noecho();
1323 	nodelay(v->window, TRUE);
1324 	if (!fast_refresh)
1325 		halfdelay(10);
1326 	if (ret == ERR)
1327 		return NULL;
1328 
1329 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1330 		err = view->search_start(view);
1331 		if (err) {
1332 			regfree(&view->regex);
1333 			return err;
1334 		}
1335 		view->search_started = 1;
1336 		view->searching = TOG_SEARCH_FORWARD;
1337 		view->search_next_done = 0;
1338 		view->search_next(view);
1339 	}
1340 
1341 	return NULL;
1342 }
1343 
1344 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1345 static const struct got_error *
1346 switch_split(struct tog_view *view)
1347 {
1348 	const struct got_error	*err = NULL;
1349 	struct tog_view		*v = NULL;
1350 
1351 	if (view->parent)
1352 		v = view->parent;
1353 	else
1354 		v = view;
1355 
1356 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1357 		v->mode = TOG_VIEW_SPLIT_VERT;
1358 	else
1359 		v->mode = TOG_VIEW_SPLIT_HRZN;
1360 
1361 	if (!v->child)
1362 		return NULL;
1363 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1364 		v->mode = TOG_VIEW_SPLIT_NONE;
1365 
1366 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1367 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1368 		v->child->begin_y = v->child->resized_y;
1369 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1370 		v->child->begin_x = v->child->resized_x;
1371 
1372 
1373 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1374 		v->ncols = COLS;
1375 		v->child->ncols = COLS;
1376 		v->child->nscrolled = LINES - v->child->nlines;
1377 
1378 		err = view_init_hsplit(v, v->child->begin_y);
1379 		if (err)
1380 			return err;
1381 	}
1382 	v->child->mode = v->mode;
1383 	v->child->nlines = v->lines - v->child->begin_y;
1384 	v->focus_child = 1;
1385 
1386 	err = view_fullscreen(v);
1387 	if (err)
1388 		return err;
1389 	err = view_splitscreen(v->child);
1390 	if (err)
1391 		return err;
1392 
1393 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1394 		v->mode = TOG_VIEW_SPLIT_VERT;
1395 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1396 		err = offset_selection_down(v);
1397 		if (err)
1398 			return err;
1399 		err = offset_selection_down(v->child);
1400 		if (err)
1401 			return err;
1402 	} else {
1403 		offset_selection_up(v);
1404 		offset_selection_up(v->child);
1405 	}
1406 	if (v->resize)
1407 		err = v->resize(v, 0);
1408 	else if (v->child->resize)
1409 		err = v->child->resize(v->child, 0);
1410 
1411 	return err;
1412 }
1413 
1414 /*
1415  * Compute view->count from numeric input. Assign total to view->count and
1416  * return first non-numeric key entered.
1417  */
1418 static int
1419 get_compound_key(struct tog_view *view, int c)
1420 {
1421 	struct tog_view	*v = view;
1422 	int		 x, n = 0;
1423 
1424 	if (view_is_hsplit_top(view))
1425 		v = view->child;
1426 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1427 		v = view->parent;
1428 
1429 	view->count = 0;
1430 	cbreak();  /* block for input */
1431 	nodelay(view->window, FALSE);
1432 	wmove(v->window, v->nlines - 1, 0);
1433 	wclrtoeol(v->window);
1434 	waddch(v->window, ':');
1435 
1436 	do {
1437 		x = getcurx(v->window);
1438 		if (x != ERR && x < view->ncols) {
1439 			waddch(v->window, c);
1440 			wrefresh(v->window);
1441 		}
1442 
1443 		/*
1444 		 * Don't overflow. Max valid request should be the greatest
1445 		 * between the longest and total lines; cap at 10 million.
1446 		 */
1447 		if (n >= 9999999)
1448 			n = 9999999;
1449 		else
1450 			n = n * 10 + (c - '0');
1451 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1452 
1453 	if (c == 'G' || c == 'g') {	/* nG key map */
1454 		view->gline = view->hiline = n;
1455 		n = 0;
1456 		c = 0;
1457 	}
1458 
1459 	/* Massage excessive or inapplicable values at the input handler. */
1460 	view->count = n;
1461 
1462 	return c;
1463 }
1464 
1465 static void
1466 action_report(struct tog_view *view)
1467 {
1468 	struct tog_view *v = view;
1469 
1470 	if (view_is_hsplit_top(view))
1471 		v = view->child;
1472 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1473 		v = view->parent;
1474 
1475 	wmove(v->window, v->nlines - 1, 0);
1476 	wclrtoeol(v->window);
1477 	wprintw(v->window, ":%s", view->action);
1478 	wrefresh(v->window);
1479 
1480 	/*
1481 	 * Clear action status report. Only clear in blame view
1482 	 * once annotating is complete, otherwise it's too fast.
1483 	 */
1484 	if (view->type == TOG_VIEW_BLAME) {
1485 		if (view->state.blame.blame_complete)
1486 			view->action = NULL;
1487 	} else
1488 		view->action = NULL;
1489 }
1490 
1491 static const struct got_error *
1492 view_input(struct tog_view **new, int *done, struct tog_view *view,
1493     struct tog_view_list_head *views, int fast_refresh)
1494 {
1495 	const struct got_error *err = NULL;
1496 	struct tog_view *v;
1497 	int ch, errcode;
1498 
1499 	*new = NULL;
1500 
1501 	if (view->action)
1502 		action_report(view);
1503 
1504 	/* Clear "no matches" indicator. */
1505 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1506 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1507 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1508 		view->count = 0;
1509 	}
1510 
1511 	if (view->searching && !view->search_next_done) {
1512 		errcode = pthread_mutex_unlock(&tog_mutex);
1513 		if (errcode)
1514 			return got_error_set_errno(errcode,
1515 			    "pthread_mutex_unlock");
1516 		sched_yield();
1517 		errcode = pthread_mutex_lock(&tog_mutex);
1518 		if (errcode)
1519 			return got_error_set_errno(errcode,
1520 			    "pthread_mutex_lock");
1521 		view->search_next(view);
1522 		return NULL;
1523 	}
1524 
1525 	/* Allow threads to make progress while we are waiting for input. */
1526 	errcode = pthread_mutex_unlock(&tog_mutex);
1527 	if (errcode)
1528 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1529 	/* If we have an unfinished count, let C-g or backspace abort. */
1530 	if (view->count && --view->count) {
1531 		cbreak();
1532 		nodelay(view->window, TRUE);
1533 		ch = wgetch(view->window);
1534 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1535 			view->count = 0;
1536 		else
1537 			ch = view->ch;
1538 	} else {
1539 		ch = wgetch(view->window);
1540 		if (ch >= '1' && ch  <= '9')
1541 			view->ch = ch = get_compound_key(view, ch);
1542 	}
1543 	if (view->hiline && ch != ERR && ch != 0)
1544 		view->hiline = 0;  /* key pressed, clear line highlight */
1545 	nodelay(view->window, TRUE);
1546 	errcode = pthread_mutex_lock(&tog_mutex);
1547 	if (errcode)
1548 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1549 
1550 	if (tog_sigwinch_received || tog_sigcont_received) {
1551 		tog_resizeterm();
1552 		tog_sigwinch_received = 0;
1553 		tog_sigcont_received = 0;
1554 		TAILQ_FOREACH(v, views, entry) {
1555 			err = view_resize(v);
1556 			if (err)
1557 				return err;
1558 			err = v->input(new, v, KEY_RESIZE);
1559 			if (err)
1560 				return err;
1561 			if (v->child) {
1562 				err = view_resize(v->child);
1563 				if (err)
1564 					return err;
1565 				err = v->child->input(new, v->child,
1566 				    KEY_RESIZE);
1567 				if (err)
1568 					return err;
1569 				if (v->child->resized_x || v->child->resized_y) {
1570 					err = view_resize_split(v, 0);
1571 					if (err)
1572 						return err;
1573 				}
1574 			}
1575 		}
1576 	}
1577 
1578 	switch (ch) {
1579 	case '?':
1580 	case 'H':
1581 	case KEY_F(1):
1582 		if (view->type == TOG_VIEW_HELP)
1583 			err = view->reset(view);
1584 		else
1585 			err = view_request_new(new, view, TOG_VIEW_HELP);
1586 		break;
1587 	case '\t':
1588 		view->count = 0;
1589 		if (view->child) {
1590 			view->focussed = 0;
1591 			view->child->focussed = 1;
1592 			view->focus_child = 1;
1593 		} else if (view->parent) {
1594 			view->focussed = 0;
1595 			view->parent->focussed = 1;
1596 			view->parent->focus_child = 0;
1597 			if (!view_is_splitscreen(view)) {
1598 				if (view->parent->resize) {
1599 					err = view->parent->resize(view->parent,
1600 					    0);
1601 					if (err)
1602 						return err;
1603 				}
1604 				offset_selection_up(view->parent);
1605 				err = view_fullscreen(view->parent);
1606 				if (err)
1607 					return err;
1608 			}
1609 		}
1610 		break;
1611 	case 'q':
1612 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1613 			if (view->parent->resize) {
1614 				/* might need more commits to fill fullscreen */
1615 				err = view->parent->resize(view->parent, 0);
1616 				if (err)
1617 					break;
1618 			}
1619 			offset_selection_up(view->parent);
1620 		}
1621 		err = view->input(new, view, ch);
1622 		view->dying = 1;
1623 		break;
1624 	case 'Q':
1625 		*done = 1;
1626 		break;
1627 	case 'F':
1628 		view->count = 0;
1629 		if (view_is_parent_view(view)) {
1630 			if (view->child == NULL)
1631 				break;
1632 			if (view_is_splitscreen(view->child)) {
1633 				view->focussed = 0;
1634 				view->child->focussed = 1;
1635 				err = view_fullscreen(view->child);
1636 			} else {
1637 				err = view_splitscreen(view->child);
1638 				if (!err)
1639 					err = view_resize_split(view, 0);
1640 			}
1641 			if (err)
1642 				break;
1643 			err = view->child->input(new, view->child,
1644 			    KEY_RESIZE);
1645 		} else {
1646 			if (view_is_splitscreen(view)) {
1647 				view->parent->focussed = 0;
1648 				view->focussed = 1;
1649 				err = view_fullscreen(view);
1650 			} else {
1651 				err = view_splitscreen(view);
1652 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1653 					err = view_resize(view->parent);
1654 				if (!err)
1655 					err = view_resize_split(view, 0);
1656 			}
1657 			if (err)
1658 				break;
1659 			err = view->input(new, view, KEY_RESIZE);
1660 		}
1661 		if (err)
1662 			break;
1663 		if (view->resize) {
1664 			err = view->resize(view, 0);
1665 			if (err)
1666 				break;
1667 		}
1668 		if (view->parent)
1669 			err = offset_selection_down(view->parent);
1670 		if (!err)
1671 			err = offset_selection_down(view);
1672 		break;
1673 	case 'S':
1674 		view->count = 0;
1675 		err = switch_split(view);
1676 		break;
1677 	case '-':
1678 		err = view_resize_split(view, -1);
1679 		break;
1680 	case '+':
1681 		err = view_resize_split(view, 1);
1682 		break;
1683 	case KEY_RESIZE:
1684 		break;
1685 	case '/':
1686 		view->count = 0;
1687 		if (view->search_start)
1688 			view_search_start(view, fast_refresh);
1689 		else
1690 			err = view->input(new, view, ch);
1691 		break;
1692 	case 'N':
1693 	case 'n':
1694 		if (view->search_started && view->search_next) {
1695 			view->searching = (ch == 'n' ?
1696 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1697 			view->search_next_done = 0;
1698 			view->search_next(view);
1699 		} else
1700 			err = view->input(new, view, ch);
1701 		break;
1702 	case 'A':
1703 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1704 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1705 			view->action = "Patience diff algorithm";
1706 		} else {
1707 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1708 			view->action = "Myers diff algorithm";
1709 		}
1710 		TAILQ_FOREACH(v, views, entry) {
1711 			if (v->reset) {
1712 				err = v->reset(v);
1713 				if (err)
1714 					return err;
1715 			}
1716 			if (v->child && v->child->reset) {
1717 				err = v->child->reset(v->child);
1718 				if (err)
1719 					return err;
1720 			}
1721 		}
1722 		break;
1723 	default:
1724 		err = view->input(new, view, ch);
1725 		break;
1726 	}
1727 
1728 	return err;
1729 }
1730 
1731 static int
1732 view_needs_focus_indication(struct tog_view *view)
1733 {
1734 	if (view_is_parent_view(view)) {
1735 		if (view->child == NULL || view->child->focussed)
1736 			return 0;
1737 		if (!view_is_splitscreen(view->child))
1738 			return 0;
1739 	} else if (!view_is_splitscreen(view))
1740 		return 0;
1741 
1742 	return view->focussed;
1743 }
1744 
1745 static const struct got_error *
1746 view_loop(struct tog_view *view)
1747 {
1748 	const struct got_error *err = NULL;
1749 	struct tog_view_list_head views;
1750 	struct tog_view *new_view;
1751 	char *mode;
1752 	int fast_refresh = 10;
1753 	int done = 0, errcode;
1754 
1755 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1756 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1757 		view->mode = TOG_VIEW_SPLIT_VERT;
1758 	else
1759 		view->mode = TOG_VIEW_SPLIT_HRZN;
1760 
1761 	errcode = pthread_mutex_lock(&tog_mutex);
1762 	if (errcode)
1763 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1764 
1765 	TAILQ_INIT(&views);
1766 	TAILQ_INSERT_HEAD(&views, view, entry);
1767 
1768 	view->focussed = 1;
1769 	err = view->show(view);
1770 	if (err)
1771 		return err;
1772 	update_panels();
1773 	doupdate();
1774 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1775 	    !tog_fatal_signal_received()) {
1776 		/* Refresh fast during initialization, then become slower. */
1777 		if (fast_refresh && --fast_refresh == 0)
1778 			halfdelay(10); /* switch to once per second */
1779 
1780 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1781 		if (err)
1782 			break;
1783 
1784 		if (view->dying && view == TAILQ_FIRST(&views) &&
1785 		    TAILQ_NEXT(view, entry) == NULL)
1786 			done = 1;
1787 		if (done) {
1788 			struct tog_view *v;
1789 
1790 			/*
1791 			 * When we quit, scroll the screen up a single line
1792 			 * so we don't lose any information.
1793 			 */
1794 			TAILQ_FOREACH(v, &views, entry) {
1795 				wmove(v->window, 0, 0);
1796 				wdeleteln(v->window);
1797 				wnoutrefresh(v->window);
1798 				if (v->child && !view_is_fullscreen(v)) {
1799 					wmove(v->child->window, 0, 0);
1800 					wdeleteln(v->child->window);
1801 					wnoutrefresh(v->child->window);
1802 				}
1803 			}
1804 			doupdate();
1805 		}
1806 
1807 		if (view->dying) {
1808 			struct tog_view *v, *prev = NULL;
1809 
1810 			if (view_is_parent_view(view))
1811 				prev = TAILQ_PREV(view, tog_view_list_head,
1812 				    entry);
1813 			else if (view->parent)
1814 				prev = view->parent;
1815 
1816 			if (view->parent) {
1817 				view->parent->child = NULL;
1818 				view->parent->focus_child = 0;
1819 				/* Restore fullscreen line height. */
1820 				view->parent->nlines = view->parent->lines;
1821 				err = view_resize(view->parent);
1822 				if (err)
1823 					break;
1824 				/* Make resized splits persist. */
1825 				view_transfer_size(view->parent, view);
1826 			} else
1827 				TAILQ_REMOVE(&views, view, entry);
1828 
1829 			err = view_close(view);
1830 			if (err)
1831 				goto done;
1832 
1833 			view = NULL;
1834 			TAILQ_FOREACH(v, &views, entry) {
1835 				if (v->focussed)
1836 					break;
1837 			}
1838 			if (view == NULL && new_view == NULL) {
1839 				/* No view has focus. Try to pick one. */
1840 				if (prev)
1841 					view = prev;
1842 				else if (!TAILQ_EMPTY(&views)) {
1843 					view = TAILQ_LAST(&views,
1844 					    tog_view_list_head);
1845 				}
1846 				if (view) {
1847 					if (view->focus_child) {
1848 						view->child->focussed = 1;
1849 						view = view->child;
1850 					} else
1851 						view->focussed = 1;
1852 				}
1853 			}
1854 		}
1855 		if (new_view) {
1856 			struct tog_view *v, *t;
1857 			/* Only allow one parent view per type. */
1858 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1859 				if (v->type != new_view->type)
1860 					continue;
1861 				TAILQ_REMOVE(&views, v, entry);
1862 				err = view_close(v);
1863 				if (err)
1864 					goto done;
1865 				break;
1866 			}
1867 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1868 			view = new_view;
1869 		}
1870 		if (view && !done) {
1871 			if (view_is_parent_view(view)) {
1872 				if (view->child && view->child->focussed)
1873 					view = view->child;
1874 			} else {
1875 				if (view->parent && view->parent->focussed)
1876 					view = view->parent;
1877 			}
1878 			show_panel(view->panel);
1879 			if (view->child && view_is_splitscreen(view->child))
1880 				show_panel(view->child->panel);
1881 			if (view->parent && view_is_splitscreen(view)) {
1882 				err = view->parent->show(view->parent);
1883 				if (err)
1884 					goto done;
1885 			}
1886 			err = view->show(view);
1887 			if (err)
1888 				goto done;
1889 			if (view->child) {
1890 				err = view->child->show(view->child);
1891 				if (err)
1892 					goto done;
1893 			}
1894 			update_panels();
1895 			doupdate();
1896 		}
1897 	}
1898 done:
1899 	while (!TAILQ_EMPTY(&views)) {
1900 		const struct got_error *close_err;
1901 		view = TAILQ_FIRST(&views);
1902 		TAILQ_REMOVE(&views, view, entry);
1903 		close_err = view_close(view);
1904 		if (close_err && err == NULL)
1905 			err = close_err;
1906 	}
1907 
1908 	errcode = pthread_mutex_unlock(&tog_mutex);
1909 	if (errcode && err == NULL)
1910 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1911 
1912 	return err;
1913 }
1914 
1915 __dead static void
1916 usage_log(void)
1917 {
1918 	endwin();
1919 	fprintf(stderr,
1920 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1921 	    getprogname());
1922 	exit(1);
1923 }
1924 
1925 /* Create newly allocated wide-character string equivalent to a byte string. */
1926 static const struct got_error *
1927 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1928 {
1929 	char *vis = NULL;
1930 	const struct got_error *err = NULL;
1931 
1932 	*ws = NULL;
1933 	*wlen = mbstowcs(NULL, s, 0);
1934 	if (*wlen == (size_t)-1) {
1935 		int vislen;
1936 		if (errno != EILSEQ)
1937 			return got_error_from_errno("mbstowcs");
1938 
1939 		/* byte string invalid in current encoding; try to "fix" it */
1940 		err = got_mbsavis(&vis, &vislen, s);
1941 		if (err)
1942 			return err;
1943 		*wlen = mbstowcs(NULL, vis, 0);
1944 		if (*wlen == (size_t)-1) {
1945 			err = got_error_from_errno("mbstowcs"); /* give up */
1946 			goto done;
1947 		}
1948 	}
1949 
1950 	*ws = calloc(*wlen + 1, sizeof(**ws));
1951 	if (*ws == NULL) {
1952 		err = got_error_from_errno("calloc");
1953 		goto done;
1954 	}
1955 
1956 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1957 		err = got_error_from_errno("mbstowcs");
1958 done:
1959 	free(vis);
1960 	if (err) {
1961 		free(*ws);
1962 		*ws = NULL;
1963 		*wlen = 0;
1964 	}
1965 	return err;
1966 }
1967 
1968 static const struct got_error *
1969 expand_tab(char **ptr, const char *src)
1970 {
1971 	char	*dst;
1972 	size_t	 len, n, idx = 0, sz = 0;
1973 
1974 	*ptr = NULL;
1975 	n = len = strlen(src);
1976 	dst = malloc(n + 1);
1977 	if (dst == NULL)
1978 		return got_error_from_errno("malloc");
1979 
1980 	while (idx < len && src[idx]) {
1981 		const char c = src[idx];
1982 
1983 		if (c == '\t') {
1984 			size_t nb = TABSIZE - sz % TABSIZE;
1985 			char *p;
1986 
1987 			p = realloc(dst, n + nb);
1988 			if (p == NULL) {
1989 				free(dst);
1990 				return got_error_from_errno("realloc");
1991 
1992 			}
1993 			dst = p;
1994 			n += nb;
1995 			memset(dst + sz, ' ', nb);
1996 			sz += nb;
1997 		} else
1998 			dst[sz++] = src[idx];
1999 		++idx;
2000 	}
2001 
2002 	dst[sz] = '\0';
2003 	*ptr = dst;
2004 	return NULL;
2005 }
2006 
2007 /*
2008  * Advance at most n columns from wline starting at offset off.
2009  * Return the index to the first character after the span operation.
2010  * Return the combined column width of all spanned wide character in
2011  * *rcol.
2012  */
2013 static int
2014 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2015 {
2016 	int width, i, cols = 0;
2017 
2018 	if (n == 0) {
2019 		*rcol = cols;
2020 		return off;
2021 	}
2022 
2023 	for (i = off; wline[i] != L'\0'; ++i) {
2024 		if (wline[i] == L'\t')
2025 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2026 		else
2027 			width = wcwidth(wline[i]);
2028 
2029 		if (width == -1) {
2030 			width = 1;
2031 			wline[i] = L'.';
2032 		}
2033 
2034 		if (cols + width > n)
2035 			break;
2036 		cols += width;
2037 	}
2038 
2039 	*rcol = cols;
2040 	return i;
2041 }
2042 
2043 /*
2044  * Format a line for display, ensuring that it won't overflow a width limit.
2045  * With scrolling, the width returned refers to the scrolled version of the
2046  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2047  */
2048 static const struct got_error *
2049 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2050     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2051 {
2052 	const struct got_error *err = NULL;
2053 	int cols;
2054 	wchar_t *wline = NULL;
2055 	char *exstr = NULL;
2056 	size_t wlen;
2057 	int i, scrollx;
2058 
2059 	*wlinep = NULL;
2060 	*widthp = 0;
2061 
2062 	if (expand) {
2063 		err = expand_tab(&exstr, line);
2064 		if (err)
2065 			return err;
2066 	}
2067 
2068 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2069 	free(exstr);
2070 	if (err)
2071 		return err;
2072 
2073 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2074 
2075 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2076 		wline[wlen - 1] = L'\0';
2077 		wlen--;
2078 	}
2079 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2080 		wline[wlen - 1] = L'\0';
2081 		wlen--;
2082 	}
2083 
2084 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2085 	wline[i] = L'\0';
2086 
2087 	if (widthp)
2088 		*widthp = cols;
2089 	if (scrollxp)
2090 		*scrollxp = scrollx;
2091 	if (err)
2092 		free(wline);
2093 	else
2094 		*wlinep = wline;
2095 	return err;
2096 }
2097 
2098 static const struct got_error*
2099 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2100     struct got_object_id *id, struct got_repository *repo)
2101 {
2102 	static const struct got_error *err = NULL;
2103 	struct got_reflist_entry *re;
2104 	char *s;
2105 	const char *name;
2106 
2107 	*refs_str = NULL;
2108 
2109 	TAILQ_FOREACH(re, refs, entry) {
2110 		struct got_tag_object *tag = NULL;
2111 		struct got_object_id *ref_id;
2112 		int cmp;
2113 
2114 		name = got_ref_get_name(re->ref);
2115 		if (strcmp(name, GOT_REF_HEAD) == 0)
2116 			continue;
2117 		if (strncmp(name, "refs/", 5) == 0)
2118 			name += 5;
2119 		if (strncmp(name, "got/", 4) == 0 &&
2120 		    strncmp(name, "got/backup/", 11) != 0)
2121 			continue;
2122 		if (strncmp(name, "heads/", 6) == 0)
2123 			name += 6;
2124 		if (strncmp(name, "remotes/", 8) == 0) {
2125 			name += 8;
2126 			s = strstr(name, "/" GOT_REF_HEAD);
2127 			if (s != NULL && s[strlen(s)] == '\0')
2128 				continue;
2129 		}
2130 		err = got_ref_resolve(&ref_id, repo, re->ref);
2131 		if (err)
2132 			break;
2133 		if (strncmp(name, "tags/", 5) == 0) {
2134 			err = got_object_open_as_tag(&tag, repo, ref_id);
2135 			if (err) {
2136 				if (err->code != GOT_ERR_OBJ_TYPE) {
2137 					free(ref_id);
2138 					break;
2139 				}
2140 				/* Ref points at something other than a tag. */
2141 				err = NULL;
2142 				tag = NULL;
2143 			}
2144 		}
2145 		cmp = got_object_id_cmp(tag ?
2146 		    got_object_tag_get_object_id(tag) : ref_id, id);
2147 		free(ref_id);
2148 		if (tag)
2149 			got_object_tag_close(tag);
2150 		if (cmp != 0)
2151 			continue;
2152 		s = *refs_str;
2153 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2154 		    s ? ", " : "", name) == -1) {
2155 			err = got_error_from_errno("asprintf");
2156 			free(s);
2157 			*refs_str = NULL;
2158 			break;
2159 		}
2160 		free(s);
2161 	}
2162 
2163 	return err;
2164 }
2165 
2166 static const struct got_error *
2167 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2168     int col_tab_align)
2169 {
2170 	char *smallerthan;
2171 
2172 	smallerthan = strchr(author, '<');
2173 	if (smallerthan && smallerthan[1] != '\0')
2174 		author = smallerthan + 1;
2175 	author[strcspn(author, "@>")] = '\0';
2176 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2177 	    col_tab_align, 0);
2178 }
2179 
2180 static const struct got_error *
2181 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2182     struct got_object_id *id, const size_t date_display_cols,
2183     int author_display_cols)
2184 {
2185 	struct tog_log_view_state *s = &view->state.log;
2186 	const struct got_error *err = NULL;
2187 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2188 	char *logmsg0 = NULL, *logmsg = NULL;
2189 	char *author = NULL;
2190 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2191 	int author_width, logmsg_width;
2192 	char *newline, *line = NULL;
2193 	int col, limit, scrollx;
2194 	const int avail = view->ncols;
2195 	struct tm tm;
2196 	time_t committer_time;
2197 	struct tog_color *tc;
2198 
2199 	committer_time = got_object_commit_get_committer_time(commit);
2200 	if (gmtime_r(&committer_time, &tm) == NULL)
2201 		return got_error_from_errno("gmtime_r");
2202 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2203 		return got_error(GOT_ERR_NO_SPACE);
2204 
2205 	if (avail <= date_display_cols)
2206 		limit = MIN(sizeof(datebuf) - 1, avail);
2207 	else
2208 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2209 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2210 	if (tc)
2211 		wattr_on(view->window,
2212 		    COLOR_PAIR(tc->colorpair), NULL);
2213 	waddnstr(view->window, datebuf, limit);
2214 	if (tc)
2215 		wattr_off(view->window,
2216 		    COLOR_PAIR(tc->colorpair), NULL);
2217 	col = limit;
2218 	if (col > avail)
2219 		goto done;
2220 
2221 	if (avail >= 120) {
2222 		char *id_str;
2223 		err = got_object_id_str(&id_str, id);
2224 		if (err)
2225 			goto done;
2226 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2227 		if (tc)
2228 			wattr_on(view->window,
2229 			    COLOR_PAIR(tc->colorpair), NULL);
2230 		wprintw(view->window, "%.8s ", id_str);
2231 		if (tc)
2232 			wattr_off(view->window,
2233 			    COLOR_PAIR(tc->colorpair), NULL);
2234 		free(id_str);
2235 		col += 9;
2236 		if (col > avail)
2237 			goto done;
2238 	}
2239 
2240 	if (s->use_committer)
2241 		author = strdup(got_object_commit_get_committer(commit));
2242 	else
2243 		author = strdup(got_object_commit_get_author(commit));
2244 	if (author == NULL) {
2245 		err = got_error_from_errno("strdup");
2246 		goto done;
2247 	}
2248 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2249 	if (err)
2250 		goto done;
2251 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2252 	if (tc)
2253 		wattr_on(view->window,
2254 		    COLOR_PAIR(tc->colorpair), NULL);
2255 	waddwstr(view->window, wauthor);
2256 	col += author_width;
2257 	while (col < avail && author_width < author_display_cols + 2) {
2258 		waddch(view->window, ' ');
2259 		col++;
2260 		author_width++;
2261 	}
2262 	if (tc)
2263 		wattr_off(view->window,
2264 		    COLOR_PAIR(tc->colorpair), NULL);
2265 	if (col > avail)
2266 		goto done;
2267 
2268 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2269 	if (err)
2270 		goto done;
2271 	logmsg = logmsg0;
2272 	while (*logmsg == '\n')
2273 		logmsg++;
2274 	newline = strchr(logmsg, '\n');
2275 	if (newline)
2276 		*newline = '\0';
2277 	limit = avail - col;
2278 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2279 		limit--;	/* for the border */
2280 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2281 	    limit, col, 1);
2282 	if (err)
2283 		goto done;
2284 	waddwstr(view->window, &wlogmsg[scrollx]);
2285 	col += MAX(logmsg_width, 0);
2286 	while (col < avail) {
2287 		waddch(view->window, ' ');
2288 		col++;
2289 	}
2290 done:
2291 	free(logmsg0);
2292 	free(wlogmsg);
2293 	free(author);
2294 	free(wauthor);
2295 	free(line);
2296 	return err;
2297 }
2298 
2299 static struct commit_queue_entry *
2300 alloc_commit_queue_entry(struct got_commit_object *commit,
2301     struct got_object_id *id)
2302 {
2303 	struct commit_queue_entry *entry;
2304 	struct got_object_id *dup;
2305 
2306 	entry = calloc(1, sizeof(*entry));
2307 	if (entry == NULL)
2308 		return NULL;
2309 
2310 	dup = got_object_id_dup(id);
2311 	if (dup == NULL) {
2312 		free(entry);
2313 		return NULL;
2314 	}
2315 
2316 	entry->id = dup;
2317 	entry->commit = commit;
2318 	return entry;
2319 }
2320 
2321 static void
2322 pop_commit(struct commit_queue *commits)
2323 {
2324 	struct commit_queue_entry *entry;
2325 
2326 	entry = TAILQ_FIRST(&commits->head);
2327 	TAILQ_REMOVE(&commits->head, entry, entry);
2328 	got_object_commit_close(entry->commit);
2329 	commits->ncommits--;
2330 	free(entry->id);
2331 	free(entry);
2332 }
2333 
2334 static void
2335 free_commits(struct commit_queue *commits)
2336 {
2337 	while (!TAILQ_EMPTY(&commits->head))
2338 		pop_commit(commits);
2339 }
2340 
2341 static const struct got_error *
2342 match_commit(int *have_match, struct got_object_id *id,
2343     struct got_commit_object *commit, regex_t *regex)
2344 {
2345 	const struct got_error *err = NULL;
2346 	regmatch_t regmatch;
2347 	char *id_str = NULL, *logmsg = NULL;
2348 
2349 	*have_match = 0;
2350 
2351 	err = got_object_id_str(&id_str, id);
2352 	if (err)
2353 		return err;
2354 
2355 	err = got_object_commit_get_logmsg(&logmsg, commit);
2356 	if (err)
2357 		goto done;
2358 
2359 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2360 	    &regmatch, 0) == 0 ||
2361 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2362 	    &regmatch, 0) == 0 ||
2363 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2364 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2365 		*have_match = 1;
2366 done:
2367 	free(id_str);
2368 	free(logmsg);
2369 	return err;
2370 }
2371 
2372 static const struct got_error *
2373 queue_commits(struct tog_log_thread_args *a)
2374 {
2375 	const struct got_error *err = NULL;
2376 
2377 	/*
2378 	 * We keep all commits open throughout the lifetime of the log
2379 	 * view in order to avoid having to re-fetch commits from disk
2380 	 * while updating the display.
2381 	 */
2382 	do {
2383 		struct got_object_id id;
2384 		struct got_commit_object *commit;
2385 		struct commit_queue_entry *entry;
2386 		int limit_match = 0;
2387 		int errcode;
2388 
2389 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2390 		    NULL, NULL);
2391 		if (err)
2392 			break;
2393 
2394 		err = got_object_open_as_commit(&commit, a->repo, &id);
2395 		if (err)
2396 			break;
2397 		entry = alloc_commit_queue_entry(commit, &id);
2398 		if (entry == NULL) {
2399 			err = got_error_from_errno("alloc_commit_queue_entry");
2400 			break;
2401 		}
2402 
2403 		errcode = pthread_mutex_lock(&tog_mutex);
2404 		if (errcode) {
2405 			err = got_error_set_errno(errcode,
2406 			    "pthread_mutex_lock");
2407 			break;
2408 		}
2409 
2410 		entry->idx = a->real_commits->ncommits;
2411 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2412 		a->real_commits->ncommits++;
2413 
2414 		if (*a->limiting) {
2415 			err = match_commit(&limit_match, &id, commit,
2416 			    a->limit_regex);
2417 			if (err)
2418 				break;
2419 
2420 			if (limit_match) {
2421 				struct commit_queue_entry *matched;
2422 
2423 				matched = alloc_commit_queue_entry(
2424 				    entry->commit, entry->id);
2425 				if (matched == NULL) {
2426 					err = got_error_from_errno(
2427 					    "alloc_commit_queue_entry");
2428 					break;
2429 				}
2430 				matched->commit = entry->commit;
2431 				got_object_commit_retain(entry->commit);
2432 
2433 				matched->idx = a->limit_commits->ncommits;
2434 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2435 				    matched, entry);
2436 				a->limit_commits->ncommits++;
2437 			}
2438 
2439 			/*
2440 			 * This is how we signal log_thread() that we
2441 			 * have found a match, and that it should be
2442 			 * counted as a new entry for the view.
2443 			 */
2444 			a->limit_match = limit_match;
2445 		}
2446 
2447 		if (*a->searching == TOG_SEARCH_FORWARD &&
2448 		    !*a->search_next_done) {
2449 			int have_match;
2450 			err = match_commit(&have_match, &id, commit, a->regex);
2451 			if (err)
2452 				break;
2453 
2454 			if (*a->limiting) {
2455 				if (limit_match && have_match)
2456 					*a->search_next_done =
2457 					    TOG_SEARCH_HAVE_MORE;
2458 			} else if (have_match)
2459 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2460 		}
2461 
2462 		errcode = pthread_mutex_unlock(&tog_mutex);
2463 		if (errcode && err == NULL)
2464 			err = got_error_set_errno(errcode,
2465 			    "pthread_mutex_unlock");
2466 		if (err)
2467 			break;
2468 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2469 
2470 	return err;
2471 }
2472 
2473 static void
2474 select_commit(struct tog_log_view_state *s)
2475 {
2476 	struct commit_queue_entry *entry;
2477 	int ncommits = 0;
2478 
2479 	entry = s->first_displayed_entry;
2480 	while (entry) {
2481 		if (ncommits == s->selected) {
2482 			s->selected_entry = entry;
2483 			break;
2484 		}
2485 		entry = TAILQ_NEXT(entry, entry);
2486 		ncommits++;
2487 	}
2488 }
2489 
2490 static const struct got_error *
2491 draw_commits(struct tog_view *view)
2492 {
2493 	const struct got_error *err = NULL;
2494 	struct tog_log_view_state *s = &view->state.log;
2495 	struct commit_queue_entry *entry = s->selected_entry;
2496 	int limit = view->nlines;
2497 	int width;
2498 	int ncommits, author_cols = 4;
2499 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2500 	char *refs_str = NULL;
2501 	wchar_t *wline;
2502 	struct tog_color *tc;
2503 	static const size_t date_display_cols = 12;
2504 
2505 	if (view_is_hsplit_top(view))
2506 		--limit;  /* account for border */
2507 
2508 	if (s->selected_entry &&
2509 	    !(view->searching && view->search_next_done == 0)) {
2510 		struct got_reflist_head *refs;
2511 		err = got_object_id_str(&id_str, s->selected_entry->id);
2512 		if (err)
2513 			return err;
2514 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2515 		    s->selected_entry->id);
2516 		if (refs) {
2517 			err = build_refs_str(&refs_str, refs,
2518 			    s->selected_entry->id, s->repo);
2519 			if (err)
2520 				goto done;
2521 		}
2522 	}
2523 
2524 	if (s->thread_args.commits_needed == 0)
2525 		halfdelay(10); /* disable fast refresh */
2526 
2527 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2528 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2529 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2530 		    (view->searching && !view->search_next_done) ?
2531 		    "searching..." : "loading...") == -1) {
2532 			err = got_error_from_errno("asprintf");
2533 			goto done;
2534 		}
2535 	} else {
2536 		const char *search_str = NULL;
2537 		const char *limit_str = NULL;
2538 
2539 		if (view->searching) {
2540 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2541 				search_str = "no more matches";
2542 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2543 				search_str = "no matches found";
2544 			else if (!view->search_next_done)
2545 				search_str = "searching...";
2546 		}
2547 
2548 		if (s->limit_view && s->commits->ncommits == 0)
2549 			limit_str = "no matches found";
2550 
2551 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2552 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2553 		    search_str ? search_str : (refs_str ? refs_str : ""),
2554 		    limit_str ? limit_str : "") == -1) {
2555 			err = got_error_from_errno("asprintf");
2556 			goto done;
2557 		}
2558 	}
2559 
2560 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2561 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2562 		    "........................................",
2563 		    s->in_repo_path, ncommits_str) == -1) {
2564 			err = got_error_from_errno("asprintf");
2565 			header = NULL;
2566 			goto done;
2567 		}
2568 	} else if (asprintf(&header, "commit %s%s",
2569 	    id_str ? id_str : "........................................",
2570 	    ncommits_str) == -1) {
2571 		err = got_error_from_errno("asprintf");
2572 		header = NULL;
2573 		goto done;
2574 	}
2575 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2576 	if (err)
2577 		goto done;
2578 
2579 	werase(view->window);
2580 
2581 	if (view_needs_focus_indication(view))
2582 		wstandout(view->window);
2583 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2584 	if (tc)
2585 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2586 	waddwstr(view->window, wline);
2587 	while (width < view->ncols) {
2588 		waddch(view->window, ' ');
2589 		width++;
2590 	}
2591 	if (tc)
2592 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2593 	if (view_needs_focus_indication(view))
2594 		wstandend(view->window);
2595 	free(wline);
2596 	if (limit <= 1)
2597 		goto done;
2598 
2599 	/* Grow author column size if necessary, and set view->maxx. */
2600 	entry = s->first_displayed_entry;
2601 	ncommits = 0;
2602 	view->maxx = 0;
2603 	while (entry) {
2604 		struct got_commit_object *c = entry->commit;
2605 		char *author, *eol, *msg, *msg0;
2606 		wchar_t *wauthor, *wmsg;
2607 		int width;
2608 		if (ncommits >= limit - 1)
2609 			break;
2610 		if (s->use_committer)
2611 			author = strdup(got_object_commit_get_committer(c));
2612 		else
2613 			author = strdup(got_object_commit_get_author(c));
2614 		if (author == NULL) {
2615 			err = got_error_from_errno("strdup");
2616 			goto done;
2617 		}
2618 		err = format_author(&wauthor, &width, author, COLS,
2619 		    date_display_cols);
2620 		if (author_cols < width)
2621 			author_cols = width;
2622 		free(wauthor);
2623 		free(author);
2624 		if (err)
2625 			goto done;
2626 		err = got_object_commit_get_logmsg(&msg0, c);
2627 		if (err)
2628 			goto done;
2629 		msg = msg0;
2630 		while (*msg == '\n')
2631 			++msg;
2632 		if ((eol = strchr(msg, '\n')))
2633 			*eol = '\0';
2634 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2635 		    date_display_cols + author_cols, 0);
2636 		if (err)
2637 			goto done;
2638 		view->maxx = MAX(view->maxx, width);
2639 		free(msg0);
2640 		free(wmsg);
2641 		ncommits++;
2642 		entry = TAILQ_NEXT(entry, entry);
2643 	}
2644 
2645 	entry = s->first_displayed_entry;
2646 	s->last_displayed_entry = s->first_displayed_entry;
2647 	ncommits = 0;
2648 	while (entry) {
2649 		if (ncommits >= limit - 1)
2650 			break;
2651 		if (ncommits == s->selected)
2652 			wstandout(view->window);
2653 		err = draw_commit(view, entry->commit, entry->id,
2654 		    date_display_cols, author_cols);
2655 		if (ncommits == s->selected)
2656 			wstandend(view->window);
2657 		if (err)
2658 			goto done;
2659 		ncommits++;
2660 		s->last_displayed_entry = entry;
2661 		entry = TAILQ_NEXT(entry, entry);
2662 	}
2663 
2664 	view_border(view);
2665 done:
2666 	free(id_str);
2667 	free(refs_str);
2668 	free(ncommits_str);
2669 	free(header);
2670 	return err;
2671 }
2672 
2673 static void
2674 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2675 {
2676 	struct commit_queue_entry *entry;
2677 	int nscrolled = 0;
2678 
2679 	entry = TAILQ_FIRST(&s->commits->head);
2680 	if (s->first_displayed_entry == entry)
2681 		return;
2682 
2683 	entry = s->first_displayed_entry;
2684 	while (entry && nscrolled < maxscroll) {
2685 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2686 		if (entry) {
2687 			s->first_displayed_entry = entry;
2688 			nscrolled++;
2689 		}
2690 	}
2691 }
2692 
2693 static const struct got_error *
2694 trigger_log_thread(struct tog_view *view, int wait)
2695 {
2696 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2697 	int errcode;
2698 
2699 	halfdelay(1); /* fast refresh while loading commits */
2700 
2701 	while (!ta->log_complete && !tog_thread_error &&
2702 	    (ta->commits_needed > 0 || ta->load_all)) {
2703 		/* Wake the log thread. */
2704 		errcode = pthread_cond_signal(&ta->need_commits);
2705 		if (errcode)
2706 			return got_error_set_errno(errcode,
2707 			    "pthread_cond_signal");
2708 
2709 		/*
2710 		 * The mutex will be released while the view loop waits
2711 		 * in wgetch(), at which time the log thread will run.
2712 		 */
2713 		if (!wait)
2714 			break;
2715 
2716 		/* Display progress update in log view. */
2717 		show_log_view(view);
2718 		update_panels();
2719 		doupdate();
2720 
2721 		/* Wait right here while next commit is being loaded. */
2722 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2723 		if (errcode)
2724 			return got_error_set_errno(errcode,
2725 			    "pthread_cond_wait");
2726 
2727 		/* Display progress update in log view. */
2728 		show_log_view(view);
2729 		update_panels();
2730 		doupdate();
2731 	}
2732 
2733 	return NULL;
2734 }
2735 
2736 static const struct got_error *
2737 request_log_commits(struct tog_view *view)
2738 {
2739 	struct tog_log_view_state	*state = &view->state.log;
2740 	const struct got_error		*err = NULL;
2741 
2742 	if (state->thread_args.log_complete)
2743 		return NULL;
2744 
2745 	state->thread_args.commits_needed += view->nscrolled;
2746 	err = trigger_log_thread(view, 1);
2747 	view->nscrolled = 0;
2748 
2749 	return err;
2750 }
2751 
2752 static const struct got_error *
2753 log_scroll_down(struct tog_view *view, int maxscroll)
2754 {
2755 	struct tog_log_view_state *s = &view->state.log;
2756 	const struct got_error *err = NULL;
2757 	struct commit_queue_entry *pentry;
2758 	int nscrolled = 0, ncommits_needed;
2759 
2760 	if (s->last_displayed_entry == NULL)
2761 		return NULL;
2762 
2763 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2764 	if (s->commits->ncommits < ncommits_needed &&
2765 	    !s->thread_args.log_complete) {
2766 		/*
2767 		 * Ask the log thread for required amount of commits.
2768 		 */
2769 		s->thread_args.commits_needed +=
2770 		    ncommits_needed - s->commits->ncommits;
2771 		err = trigger_log_thread(view, 1);
2772 		if (err)
2773 			return err;
2774 	}
2775 
2776 	do {
2777 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2778 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2779 			break;
2780 
2781 		s->last_displayed_entry = pentry ?
2782 		    pentry : s->last_displayed_entry;
2783 
2784 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2785 		if (pentry == NULL)
2786 			break;
2787 		s->first_displayed_entry = pentry;
2788 	} while (++nscrolled < maxscroll);
2789 
2790 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2791 		view->nscrolled += nscrolled;
2792 	else
2793 		view->nscrolled = 0;
2794 
2795 	return err;
2796 }
2797 
2798 static const struct got_error *
2799 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2800     struct got_commit_object *commit, struct got_object_id *commit_id,
2801     struct tog_view *log_view, struct got_repository *repo)
2802 {
2803 	const struct got_error *err;
2804 	struct got_object_qid *parent_id;
2805 	struct tog_view *diff_view;
2806 
2807 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2808 	if (diff_view == NULL)
2809 		return got_error_from_errno("view_open");
2810 
2811 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2812 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2813 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2814 	if (err == NULL)
2815 		*new_view = diff_view;
2816 	return err;
2817 }
2818 
2819 static const struct got_error *
2820 tree_view_visit_subtree(struct tog_tree_view_state *s,
2821     struct got_tree_object *subtree)
2822 {
2823 	struct tog_parent_tree *parent;
2824 
2825 	parent = calloc(1, sizeof(*parent));
2826 	if (parent == NULL)
2827 		return got_error_from_errno("calloc");
2828 
2829 	parent->tree = s->tree;
2830 	parent->first_displayed_entry = s->first_displayed_entry;
2831 	parent->selected_entry = s->selected_entry;
2832 	parent->selected = s->selected;
2833 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2834 	s->tree = subtree;
2835 	s->selected = 0;
2836 	s->first_displayed_entry = NULL;
2837 	return NULL;
2838 }
2839 
2840 static const struct got_error *
2841 tree_view_walk_path(struct tog_tree_view_state *s,
2842     struct got_commit_object *commit, const char *path)
2843 {
2844 	const struct got_error *err = NULL;
2845 	struct got_tree_object *tree = NULL;
2846 	const char *p;
2847 	char *slash, *subpath = NULL;
2848 
2849 	/* Walk the path and open corresponding tree objects. */
2850 	p = path;
2851 	while (*p) {
2852 		struct got_tree_entry *te;
2853 		struct got_object_id *tree_id;
2854 		char *te_name;
2855 
2856 		while (p[0] == '/')
2857 			p++;
2858 
2859 		/* Ensure the correct subtree entry is selected. */
2860 		slash = strchr(p, '/');
2861 		if (slash == NULL)
2862 			te_name = strdup(p);
2863 		else
2864 			te_name = strndup(p, slash - p);
2865 		if (te_name == NULL) {
2866 			err = got_error_from_errno("strndup");
2867 			break;
2868 		}
2869 		te = got_object_tree_find_entry(s->tree, te_name);
2870 		if (te == NULL) {
2871 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2872 			free(te_name);
2873 			break;
2874 		}
2875 		free(te_name);
2876 		s->first_displayed_entry = s->selected_entry = te;
2877 
2878 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2879 			break; /* jump to this file's entry */
2880 
2881 		slash = strchr(p, '/');
2882 		if (slash)
2883 			subpath = strndup(path, slash - path);
2884 		else
2885 			subpath = strdup(path);
2886 		if (subpath == NULL) {
2887 			err = got_error_from_errno("strdup");
2888 			break;
2889 		}
2890 
2891 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2892 		    subpath);
2893 		if (err)
2894 			break;
2895 
2896 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2897 		free(tree_id);
2898 		if (err)
2899 			break;
2900 
2901 		err = tree_view_visit_subtree(s, tree);
2902 		if (err) {
2903 			got_object_tree_close(tree);
2904 			break;
2905 		}
2906 		if (slash == NULL)
2907 			break;
2908 		free(subpath);
2909 		subpath = NULL;
2910 		p = slash;
2911 	}
2912 
2913 	free(subpath);
2914 	return err;
2915 }
2916 
2917 static const struct got_error *
2918 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2919     struct commit_queue_entry *entry, const char *path,
2920     const char *head_ref_name, struct got_repository *repo)
2921 {
2922 	const struct got_error *err = NULL;
2923 	struct tog_tree_view_state *s;
2924 	struct tog_view *tree_view;
2925 
2926 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2927 	if (tree_view == NULL)
2928 		return got_error_from_errno("view_open");
2929 
2930 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2931 	if (err)
2932 		return err;
2933 	s = &tree_view->state.tree;
2934 
2935 	*new_view = tree_view;
2936 
2937 	if (got_path_is_root_dir(path))
2938 		return NULL;
2939 
2940 	return tree_view_walk_path(s, entry->commit, path);
2941 }
2942 
2943 static const struct got_error *
2944 block_signals_used_by_main_thread(void)
2945 {
2946 	sigset_t sigset;
2947 	int errcode;
2948 
2949 	if (sigemptyset(&sigset) == -1)
2950 		return got_error_from_errno("sigemptyset");
2951 
2952 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2953 	if (sigaddset(&sigset, SIGWINCH) == -1)
2954 		return got_error_from_errno("sigaddset");
2955 	if (sigaddset(&sigset, SIGCONT) == -1)
2956 		return got_error_from_errno("sigaddset");
2957 	if (sigaddset(&sigset, SIGINT) == -1)
2958 		return got_error_from_errno("sigaddset");
2959 	if (sigaddset(&sigset, SIGTERM) == -1)
2960 		return got_error_from_errno("sigaddset");
2961 
2962 	/* ncurses handles SIGTSTP */
2963 	if (sigaddset(&sigset, SIGTSTP) == -1)
2964 		return got_error_from_errno("sigaddset");
2965 
2966 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2967 	if (errcode)
2968 		return got_error_set_errno(errcode, "pthread_sigmask");
2969 
2970 	return NULL;
2971 }
2972 
2973 static void *
2974 log_thread(void *arg)
2975 {
2976 	const struct got_error *err = NULL;
2977 	int errcode = 0;
2978 	struct tog_log_thread_args *a = arg;
2979 	int done = 0;
2980 
2981 	/*
2982 	 * Sync startup with main thread such that we begin our
2983 	 * work once view_input() has released the mutex.
2984 	 */
2985 	errcode = pthread_mutex_lock(&tog_mutex);
2986 	if (errcode) {
2987 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2988 		return (void *)err;
2989 	}
2990 
2991 	err = block_signals_used_by_main_thread();
2992 	if (err) {
2993 		pthread_mutex_unlock(&tog_mutex);
2994 		goto done;
2995 	}
2996 
2997 	while (!done && !err && !tog_fatal_signal_received()) {
2998 		errcode = pthread_mutex_unlock(&tog_mutex);
2999 		if (errcode) {
3000 			err = got_error_set_errno(errcode,
3001 			    "pthread_mutex_unlock");
3002 			goto done;
3003 		}
3004 		err = queue_commits(a);
3005 		if (err) {
3006 			if (err->code != GOT_ERR_ITER_COMPLETED)
3007 				goto done;
3008 			err = NULL;
3009 			done = 1;
3010 		} else if (a->commits_needed > 0 && !a->load_all) {
3011 			if (*a->limiting) {
3012 				if (a->limit_match)
3013 					a->commits_needed--;
3014 			} else
3015 				a->commits_needed--;
3016 		}
3017 
3018 		errcode = pthread_mutex_lock(&tog_mutex);
3019 		if (errcode) {
3020 			err = got_error_set_errno(errcode,
3021 			    "pthread_mutex_lock");
3022 			goto done;
3023 		} else if (*a->quit)
3024 			done = 1;
3025 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3026 			*a->first_displayed_entry =
3027 			    TAILQ_FIRST(&a->limit_commits->head);
3028 			*a->selected_entry = *a->first_displayed_entry;
3029 		} else if (*a->first_displayed_entry == NULL) {
3030 			*a->first_displayed_entry =
3031 			    TAILQ_FIRST(&a->real_commits->head);
3032 			*a->selected_entry = *a->first_displayed_entry;
3033 		}
3034 
3035 		errcode = pthread_cond_signal(&a->commit_loaded);
3036 		if (errcode) {
3037 			err = got_error_set_errno(errcode,
3038 			    "pthread_cond_signal");
3039 			pthread_mutex_unlock(&tog_mutex);
3040 			goto done;
3041 		}
3042 
3043 		if (done)
3044 			a->commits_needed = 0;
3045 		else {
3046 			if (a->commits_needed == 0 && !a->load_all) {
3047 				errcode = pthread_cond_wait(&a->need_commits,
3048 				    &tog_mutex);
3049 				if (errcode) {
3050 					err = got_error_set_errno(errcode,
3051 					    "pthread_cond_wait");
3052 					pthread_mutex_unlock(&tog_mutex);
3053 					goto done;
3054 				}
3055 				if (*a->quit)
3056 					done = 1;
3057 			}
3058 		}
3059 	}
3060 	a->log_complete = 1;
3061 	errcode = pthread_mutex_unlock(&tog_mutex);
3062 	if (errcode)
3063 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3064 done:
3065 	if (err) {
3066 		tog_thread_error = 1;
3067 		pthread_cond_signal(&a->commit_loaded);
3068 	}
3069 	return (void *)err;
3070 }
3071 
3072 static const struct got_error *
3073 stop_log_thread(struct tog_log_view_state *s)
3074 {
3075 	const struct got_error *err = NULL, *thread_err = NULL;
3076 	int errcode;
3077 
3078 	if (s->thread) {
3079 		s->quit = 1;
3080 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3081 		if (errcode)
3082 			return got_error_set_errno(errcode,
3083 			    "pthread_cond_signal");
3084 		errcode = pthread_mutex_unlock(&tog_mutex);
3085 		if (errcode)
3086 			return got_error_set_errno(errcode,
3087 			    "pthread_mutex_unlock");
3088 		errcode = pthread_join(s->thread, (void **)&thread_err);
3089 		if (errcode)
3090 			return got_error_set_errno(errcode, "pthread_join");
3091 		errcode = pthread_mutex_lock(&tog_mutex);
3092 		if (errcode)
3093 			return got_error_set_errno(errcode,
3094 			    "pthread_mutex_lock");
3095 		s->thread = NULL;
3096 	}
3097 
3098 	if (s->thread_args.repo) {
3099 		err = got_repo_close(s->thread_args.repo);
3100 		s->thread_args.repo = NULL;
3101 	}
3102 
3103 	if (s->thread_args.pack_fds) {
3104 		const struct got_error *pack_err =
3105 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3106 		if (err == NULL)
3107 			err = pack_err;
3108 		s->thread_args.pack_fds = NULL;
3109 	}
3110 
3111 	if (s->thread_args.graph) {
3112 		got_commit_graph_close(s->thread_args.graph);
3113 		s->thread_args.graph = NULL;
3114 	}
3115 
3116 	return err ? err : thread_err;
3117 }
3118 
3119 static const struct got_error *
3120 close_log_view(struct tog_view *view)
3121 {
3122 	const struct got_error *err = NULL;
3123 	struct tog_log_view_state *s = &view->state.log;
3124 	int errcode;
3125 
3126 	err = stop_log_thread(s);
3127 
3128 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3129 	if (errcode && err == NULL)
3130 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3131 
3132 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3133 	if (errcode && err == NULL)
3134 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3135 
3136 	free_commits(&s->limit_commits);
3137 	free_commits(&s->real_commits);
3138 	free(s->in_repo_path);
3139 	s->in_repo_path = NULL;
3140 	free(s->start_id);
3141 	s->start_id = NULL;
3142 	free(s->head_ref_name);
3143 	s->head_ref_name = NULL;
3144 	return err;
3145 }
3146 
3147 /*
3148  * We use two queues to implement the limit feature: first consists of
3149  * commits matching the current limit_regex; second is the real queue
3150  * of all known commits (real_commits). When the user starts limiting,
3151  * we swap queues such that all movement and displaying functionality
3152  * works with very slight change.
3153  */
3154 static const struct got_error *
3155 limit_log_view(struct tog_view *view)
3156 {
3157 	struct tog_log_view_state *s = &view->state.log;
3158 	struct commit_queue_entry *entry;
3159 	struct tog_view	*v = view;
3160 	const struct got_error *err = NULL;
3161 	char pattern[1024];
3162 	int ret;
3163 
3164 	if (view_is_hsplit_top(view))
3165 		v = view->child;
3166 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3167 		v = view->parent;
3168 
3169 	/* Get the pattern */
3170 	wmove(v->window, v->nlines - 1, 0);
3171 	wclrtoeol(v->window);
3172 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3173 	nodelay(v->window, FALSE);
3174 	nocbreak();
3175 	echo();
3176 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3177 	cbreak();
3178 	noecho();
3179 	nodelay(v->window, TRUE);
3180 	if (ret == ERR)
3181 		return NULL;
3182 
3183 	if (*pattern == '\0') {
3184 		/*
3185 		 * Safety measure for the situation where the user
3186 		 * resets limit without previously limiting anything.
3187 		 */
3188 		if (!s->limit_view)
3189 			return NULL;
3190 
3191 		/*
3192 		 * User could have pressed Ctrl+L, which refreshed the
3193 		 * commit queues, it means we can't save previously
3194 		 * (before limit took place) displayed entries,
3195 		 * because they would point to already free'ed memory,
3196 		 * so we are forced to always select first entry of
3197 		 * the queue.
3198 		 */
3199 		s->commits = &s->real_commits;
3200 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3201 		s->selected_entry = s->first_displayed_entry;
3202 		s->selected = 0;
3203 		s->limit_view = 0;
3204 
3205 		return NULL;
3206 	}
3207 
3208 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3209 		return NULL;
3210 
3211 	s->limit_view = 1;
3212 
3213 	/* Clear the screen while loading limit view */
3214 	s->first_displayed_entry = NULL;
3215 	s->last_displayed_entry = NULL;
3216 	s->selected_entry = NULL;
3217 	s->commits = &s->limit_commits;
3218 
3219 	/* Prepare limit queue for new search */
3220 	free_commits(&s->limit_commits);
3221 	s->limit_commits.ncommits = 0;
3222 
3223 	/* First process commits, which are in queue already */
3224 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3225 		int have_match = 0;
3226 
3227 		err = match_commit(&have_match, entry->id,
3228 		    entry->commit, &s->limit_regex);
3229 		if (err)
3230 			return err;
3231 
3232 		if (have_match) {
3233 			struct commit_queue_entry *matched;
3234 
3235 			matched = alloc_commit_queue_entry(entry->commit,
3236 			    entry->id);
3237 			if (matched == NULL) {
3238 				err = got_error_from_errno(
3239 				    "alloc_commit_queue_entry");
3240 				break;
3241 			}
3242 			matched->commit = entry->commit;
3243 			got_object_commit_retain(entry->commit);
3244 
3245 			matched->idx = s->limit_commits.ncommits;
3246 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3247 			    matched, entry);
3248 			s->limit_commits.ncommits++;
3249 		}
3250 	}
3251 
3252 	/* Second process all the commits, until we fill the screen */
3253 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3254 	    !s->thread_args.log_complete) {
3255 		s->thread_args.commits_needed +=
3256 		    view->nlines - s->limit_commits.ncommits - 1;
3257 		err = trigger_log_thread(view, 1);
3258 		if (err)
3259 			return err;
3260 	}
3261 
3262 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3263 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3264 	s->selected = 0;
3265 
3266 	return NULL;
3267 }
3268 
3269 static const struct got_error *
3270 search_start_log_view(struct tog_view *view)
3271 {
3272 	struct tog_log_view_state *s = &view->state.log;
3273 
3274 	s->matched_entry = NULL;
3275 	s->search_entry = NULL;
3276 	return NULL;
3277 }
3278 
3279 static const struct got_error *
3280 search_next_log_view(struct tog_view *view)
3281 {
3282 	const struct got_error *err = NULL;
3283 	struct tog_log_view_state *s = &view->state.log;
3284 	struct commit_queue_entry *entry;
3285 
3286 	/* Display progress update in log view. */
3287 	show_log_view(view);
3288 	update_panels();
3289 	doupdate();
3290 
3291 	if (s->search_entry) {
3292 		int errcode, ch;
3293 		errcode = pthread_mutex_unlock(&tog_mutex);
3294 		if (errcode)
3295 			return got_error_set_errno(errcode,
3296 			    "pthread_mutex_unlock");
3297 		ch = wgetch(view->window);
3298 		errcode = pthread_mutex_lock(&tog_mutex);
3299 		if (errcode)
3300 			return got_error_set_errno(errcode,
3301 			    "pthread_mutex_lock");
3302 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3303 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3304 			return NULL;
3305 		}
3306 		if (view->searching == TOG_SEARCH_FORWARD)
3307 			entry = TAILQ_NEXT(s->search_entry, entry);
3308 		else
3309 			entry = TAILQ_PREV(s->search_entry,
3310 			    commit_queue_head, entry);
3311 	} else if (s->matched_entry) {
3312 		/*
3313 		 * If the user has moved the cursor after we hit a match,
3314 		 * the position from where we should continue searching
3315 		 * might have changed.
3316 		 */
3317 		if (view->searching == TOG_SEARCH_FORWARD)
3318 			entry = TAILQ_NEXT(s->selected_entry, entry);
3319 		else
3320 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3321 			    entry);
3322 	} else {
3323 		entry = s->selected_entry;
3324 	}
3325 
3326 	while (1) {
3327 		int have_match = 0;
3328 
3329 		if (entry == NULL) {
3330 			if (s->thread_args.log_complete ||
3331 			    view->searching == TOG_SEARCH_BACKWARD) {
3332 				view->search_next_done =
3333 				    (s->matched_entry == NULL ?
3334 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3335 				s->search_entry = NULL;
3336 				return NULL;
3337 			}
3338 			/*
3339 			 * Poke the log thread for more commits and return,
3340 			 * allowing the main loop to make progress. Search
3341 			 * will resume at s->search_entry once we come back.
3342 			 */
3343 			s->thread_args.commits_needed++;
3344 			return trigger_log_thread(view, 0);
3345 		}
3346 
3347 		err = match_commit(&have_match, entry->id, entry->commit,
3348 		    &view->regex);
3349 		if (err)
3350 			break;
3351 		if (have_match) {
3352 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3353 			s->matched_entry = entry;
3354 			break;
3355 		}
3356 
3357 		s->search_entry = entry;
3358 		if (view->searching == TOG_SEARCH_FORWARD)
3359 			entry = TAILQ_NEXT(entry, entry);
3360 		else
3361 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3362 	}
3363 
3364 	if (s->matched_entry) {
3365 		int cur = s->selected_entry->idx;
3366 		while (cur < s->matched_entry->idx) {
3367 			err = input_log_view(NULL, view, KEY_DOWN);
3368 			if (err)
3369 				return err;
3370 			cur++;
3371 		}
3372 		while (cur > s->matched_entry->idx) {
3373 			err = input_log_view(NULL, view, KEY_UP);
3374 			if (err)
3375 				return err;
3376 			cur--;
3377 		}
3378 	}
3379 
3380 	s->search_entry = NULL;
3381 
3382 	return NULL;
3383 }
3384 
3385 static const struct got_error *
3386 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3387     struct got_repository *repo, const char *head_ref_name,
3388     const char *in_repo_path, int log_branches)
3389 {
3390 	const struct got_error *err = NULL;
3391 	struct tog_log_view_state *s = &view->state.log;
3392 	struct got_repository *thread_repo = NULL;
3393 	struct got_commit_graph *thread_graph = NULL;
3394 	int errcode;
3395 
3396 	if (in_repo_path != s->in_repo_path) {
3397 		free(s->in_repo_path);
3398 		s->in_repo_path = strdup(in_repo_path);
3399 		if (s->in_repo_path == NULL)
3400 			return got_error_from_errno("strdup");
3401 	}
3402 
3403 	/* The commit queue only contains commits being displayed. */
3404 	TAILQ_INIT(&s->real_commits.head);
3405 	s->real_commits.ncommits = 0;
3406 	s->commits = &s->real_commits;
3407 
3408 	TAILQ_INIT(&s->limit_commits.head);
3409 	s->limit_view = 0;
3410 	s->limit_commits.ncommits = 0;
3411 
3412 	s->repo = repo;
3413 	if (head_ref_name) {
3414 		s->head_ref_name = strdup(head_ref_name);
3415 		if (s->head_ref_name == NULL) {
3416 			err = got_error_from_errno("strdup");
3417 			goto done;
3418 		}
3419 	}
3420 	s->start_id = got_object_id_dup(start_id);
3421 	if (s->start_id == NULL) {
3422 		err = got_error_from_errno("got_object_id_dup");
3423 		goto done;
3424 	}
3425 	s->log_branches = log_branches;
3426 	s->use_committer = 1;
3427 
3428 	STAILQ_INIT(&s->colors);
3429 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3430 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3431 		    get_color_value("TOG_COLOR_COMMIT"));
3432 		if (err)
3433 			goto done;
3434 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3435 		    get_color_value("TOG_COLOR_AUTHOR"));
3436 		if (err) {
3437 			free_colors(&s->colors);
3438 			goto done;
3439 		}
3440 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3441 		    get_color_value("TOG_COLOR_DATE"));
3442 		if (err) {
3443 			free_colors(&s->colors);
3444 			goto done;
3445 		}
3446 	}
3447 
3448 	view->show = show_log_view;
3449 	view->input = input_log_view;
3450 	view->resize = resize_log_view;
3451 	view->close = close_log_view;
3452 	view->search_start = search_start_log_view;
3453 	view->search_next = search_next_log_view;
3454 
3455 	if (s->thread_args.pack_fds == NULL) {
3456 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3457 		if (err)
3458 			goto done;
3459 	}
3460 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3461 	    s->thread_args.pack_fds);
3462 	if (err)
3463 		goto done;
3464 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3465 	    !s->log_branches);
3466 	if (err)
3467 		goto done;
3468 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3469 	    s->repo, NULL, NULL);
3470 	if (err)
3471 		goto done;
3472 
3473 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3474 	if (errcode) {
3475 		err = got_error_set_errno(errcode, "pthread_cond_init");
3476 		goto done;
3477 	}
3478 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3479 	if (errcode) {
3480 		err = got_error_set_errno(errcode, "pthread_cond_init");
3481 		goto done;
3482 	}
3483 
3484 	s->thread_args.commits_needed = view->nlines;
3485 	s->thread_args.graph = thread_graph;
3486 	s->thread_args.real_commits = &s->real_commits;
3487 	s->thread_args.limit_commits = &s->limit_commits;
3488 	s->thread_args.in_repo_path = s->in_repo_path;
3489 	s->thread_args.start_id = s->start_id;
3490 	s->thread_args.repo = thread_repo;
3491 	s->thread_args.log_complete = 0;
3492 	s->thread_args.quit = &s->quit;
3493 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3494 	s->thread_args.selected_entry = &s->selected_entry;
3495 	s->thread_args.searching = &view->searching;
3496 	s->thread_args.search_next_done = &view->search_next_done;
3497 	s->thread_args.regex = &view->regex;
3498 	s->thread_args.limiting = &s->limit_view;
3499 	s->thread_args.limit_regex = &s->limit_regex;
3500 	s->thread_args.limit_commits = &s->limit_commits;
3501 done:
3502 	if (err)
3503 		close_log_view(view);
3504 	return err;
3505 }
3506 
3507 static const struct got_error *
3508 show_log_view(struct tog_view *view)
3509 {
3510 	const struct got_error *err;
3511 	struct tog_log_view_state *s = &view->state.log;
3512 
3513 	if (s->thread == NULL) {
3514 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3515 		    &s->thread_args);
3516 		if (errcode)
3517 			return got_error_set_errno(errcode, "pthread_create");
3518 		if (s->thread_args.commits_needed > 0) {
3519 			err = trigger_log_thread(view, 1);
3520 			if (err)
3521 				return err;
3522 		}
3523 	}
3524 
3525 	return draw_commits(view);
3526 }
3527 
3528 static void
3529 log_move_cursor_up(struct tog_view *view, int page, int home)
3530 {
3531 	struct tog_log_view_state *s = &view->state.log;
3532 
3533 	if (s->first_displayed_entry == NULL)
3534 		return;
3535 	if (s->selected_entry->idx == 0)
3536 		view->count = 0;
3537 
3538 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3539 	    || home)
3540 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3541 
3542 	if (!page && !home && s->selected > 0)
3543 		--s->selected;
3544 	else
3545 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3546 
3547 	select_commit(s);
3548 	return;
3549 }
3550 
3551 static const struct got_error *
3552 log_move_cursor_down(struct tog_view *view, int page)
3553 {
3554 	struct tog_log_view_state	*s = &view->state.log;
3555 	const struct got_error		*err = NULL;
3556 	int				 eos = view->nlines - 2;
3557 
3558 	if (s->first_displayed_entry == NULL)
3559 		return NULL;
3560 
3561 	if (s->thread_args.log_complete &&
3562 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3563 		return NULL;
3564 
3565 	if (view_is_hsplit_top(view))
3566 		--eos;  /* border consumes the last line */
3567 
3568 	if (!page) {
3569 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3570 			++s->selected;
3571 		else
3572 			err = log_scroll_down(view, 1);
3573 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3574 		struct commit_queue_entry *entry;
3575 		int n;
3576 
3577 		s->selected = 0;
3578 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3579 		s->last_displayed_entry = entry;
3580 		for (n = 0; n <= eos; n++) {
3581 			if (entry == NULL)
3582 				break;
3583 			s->first_displayed_entry = entry;
3584 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3585 		}
3586 		if (n > 0)
3587 			s->selected = n - 1;
3588 	} else {
3589 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3590 		    s->thread_args.log_complete)
3591 			s->selected += MIN(page,
3592 			    s->commits->ncommits - s->selected_entry->idx - 1);
3593 		else
3594 			err = log_scroll_down(view, page);
3595 	}
3596 	if (err)
3597 		return err;
3598 
3599 	/*
3600 	 * We might necessarily overshoot in horizontal
3601 	 * splits; if so, select the last displayed commit.
3602 	 */
3603 	if (s->first_displayed_entry && s->last_displayed_entry) {
3604 		s->selected = MIN(s->selected,
3605 		    s->last_displayed_entry->idx -
3606 		    s->first_displayed_entry->idx);
3607 	}
3608 
3609 	select_commit(s);
3610 
3611 	if (s->thread_args.log_complete &&
3612 	    s->selected_entry->idx == s->commits->ncommits - 1)
3613 		view->count = 0;
3614 
3615 	return NULL;
3616 }
3617 
3618 static void
3619 view_get_split(struct tog_view *view, int *y, int *x)
3620 {
3621 	*x = 0;
3622 	*y = 0;
3623 
3624 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3625 		if (view->child && view->child->resized_y)
3626 			*y = view->child->resized_y;
3627 		else if (view->resized_y)
3628 			*y = view->resized_y;
3629 		else
3630 			*y = view_split_begin_y(view->lines);
3631 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3632 		if (view->child && view->child->resized_x)
3633 			*x = view->child->resized_x;
3634 		else if (view->resized_x)
3635 			*x = view->resized_x;
3636 		else
3637 			*x = view_split_begin_x(view->begin_x);
3638 	}
3639 }
3640 
3641 /* Split view horizontally at y and offset view->state->selected line. */
3642 static const struct got_error *
3643 view_init_hsplit(struct tog_view *view, int y)
3644 {
3645 	const struct got_error *err = NULL;
3646 
3647 	view->nlines = y;
3648 	view->ncols = COLS;
3649 	err = view_resize(view);
3650 	if (err)
3651 		return err;
3652 
3653 	err = offset_selection_down(view);
3654 
3655 	return err;
3656 }
3657 
3658 static const struct got_error *
3659 log_goto_line(struct tog_view *view, int nlines)
3660 {
3661 	const struct got_error		*err = NULL;
3662 	struct tog_log_view_state	*s = &view->state.log;
3663 	int				 g, idx = s->selected_entry->idx;
3664 
3665 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3666 		return NULL;
3667 
3668 	g = view->gline;
3669 	view->gline = 0;
3670 
3671 	if (g >= s->first_displayed_entry->idx + 1 &&
3672 	    g <= s->last_displayed_entry->idx + 1 &&
3673 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3674 		s->selected = g - s->first_displayed_entry->idx - 1;
3675 		select_commit(s);
3676 		return NULL;
3677 	}
3678 
3679 	if (idx + 1 < g) {
3680 		err = log_move_cursor_down(view, g - idx - 1);
3681 		if (!err && g > s->selected_entry->idx + 1)
3682 			err = log_move_cursor_down(view,
3683 			    g - s->first_displayed_entry->idx - 1);
3684 		if (err)
3685 			return err;
3686 	} else if (idx + 1 > g)
3687 		log_move_cursor_up(view, idx - g + 1, 0);
3688 
3689 	if (g < nlines && s->first_displayed_entry->idx == 0)
3690 		s->selected = g - 1;
3691 
3692 	select_commit(s);
3693 	return NULL;
3694 
3695 }
3696 
3697 static void
3698 horizontal_scroll_input(struct tog_view *view, int ch)
3699 {
3700 
3701 	switch (ch) {
3702 	case KEY_LEFT:
3703 	case 'h':
3704 		view->x -= MIN(view->x, 2);
3705 		if (view->x <= 0)
3706 			view->count = 0;
3707 		break;
3708 	case KEY_RIGHT:
3709 	case 'l':
3710 		if (view->x + view->ncols / 2 < view->maxx)
3711 			view->x += 2;
3712 		else
3713 			view->count = 0;
3714 		break;
3715 	case '0':
3716 		view->x = 0;
3717 		break;
3718 	case '$':
3719 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3720 		view->count = 0;
3721 		break;
3722 	default:
3723 		break;
3724 	}
3725 }
3726 
3727 static const struct got_error *
3728 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3729 {
3730 	const struct got_error *err = NULL;
3731 	struct tog_log_view_state *s = &view->state.log;
3732 	int eos, nscroll;
3733 
3734 	if (s->thread_args.load_all) {
3735 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3736 			s->thread_args.load_all = 0;
3737 		else if (s->thread_args.log_complete) {
3738 			err = log_move_cursor_down(view, s->commits->ncommits);
3739 			s->thread_args.load_all = 0;
3740 		}
3741 		if (err)
3742 			return err;
3743 	}
3744 
3745 	eos = nscroll = view->nlines - 1;
3746 	if (view_is_hsplit_top(view))
3747 		--eos;  /* border */
3748 
3749 	if (view->gline)
3750 		return log_goto_line(view, eos);
3751 
3752 	switch (ch) {
3753 	case '&':
3754 		err = limit_log_view(view);
3755 		break;
3756 	case 'q':
3757 		s->quit = 1;
3758 		break;
3759 	case '0':
3760 	case '$':
3761 	case KEY_RIGHT:
3762 	case 'l':
3763 	case KEY_LEFT:
3764 	case 'h':
3765 		horizontal_scroll_input(view, ch);
3766 		break;
3767 	case 'k':
3768 	case KEY_UP:
3769 	case '<':
3770 	case ',':
3771 	case CTRL('p'):
3772 		log_move_cursor_up(view, 0, 0);
3773 		break;
3774 	case 'g':
3775 	case '=':
3776 	case KEY_HOME:
3777 		log_move_cursor_up(view, 0, 1);
3778 		view->count = 0;
3779 		break;
3780 	case CTRL('u'):
3781 	case 'u':
3782 		nscroll /= 2;
3783 		/* FALL THROUGH */
3784 	case KEY_PPAGE:
3785 	case CTRL('b'):
3786 	case 'b':
3787 		log_move_cursor_up(view, nscroll, 0);
3788 		break;
3789 	case 'j':
3790 	case KEY_DOWN:
3791 	case '>':
3792 	case '.':
3793 	case CTRL('n'):
3794 		err = log_move_cursor_down(view, 0);
3795 		break;
3796 	case '@':
3797 		s->use_committer = !s->use_committer;
3798 		view->action = s->use_committer ?
3799 		    "show committer" : "show commit author";
3800 		break;
3801 	case 'G':
3802 	case '*':
3803 	case KEY_END: {
3804 		/* We don't know yet how many commits, so we're forced to
3805 		 * traverse them all. */
3806 		view->count = 0;
3807 		s->thread_args.load_all = 1;
3808 		if (!s->thread_args.log_complete)
3809 			return trigger_log_thread(view, 0);
3810 		err = log_move_cursor_down(view, s->commits->ncommits);
3811 		s->thread_args.load_all = 0;
3812 		break;
3813 	}
3814 	case CTRL('d'):
3815 	case 'd':
3816 		nscroll /= 2;
3817 		/* FALL THROUGH */
3818 	case KEY_NPAGE:
3819 	case CTRL('f'):
3820 	case 'f':
3821 	case ' ':
3822 		err = log_move_cursor_down(view, nscroll);
3823 		break;
3824 	case KEY_RESIZE:
3825 		if (s->selected > view->nlines - 2)
3826 			s->selected = view->nlines - 2;
3827 		if (s->selected > s->commits->ncommits - 1)
3828 			s->selected = s->commits->ncommits - 1;
3829 		select_commit(s);
3830 		if (s->commits->ncommits < view->nlines - 1 &&
3831 		    !s->thread_args.log_complete) {
3832 			s->thread_args.commits_needed += (view->nlines - 1) -
3833 			    s->commits->ncommits;
3834 			err = trigger_log_thread(view, 1);
3835 		}
3836 		break;
3837 	case KEY_ENTER:
3838 	case '\r':
3839 		view->count = 0;
3840 		if (s->selected_entry == NULL)
3841 			break;
3842 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3843 		break;
3844 	case 'T':
3845 		view->count = 0;
3846 		if (s->selected_entry == NULL)
3847 			break;
3848 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3849 		break;
3850 	case KEY_BACKSPACE:
3851 	case CTRL('l'):
3852 	case 'B':
3853 		view->count = 0;
3854 		if (ch == KEY_BACKSPACE &&
3855 		    got_path_is_root_dir(s->in_repo_path))
3856 			break;
3857 		err = stop_log_thread(s);
3858 		if (err)
3859 			return err;
3860 		if (ch == KEY_BACKSPACE) {
3861 			char *parent_path;
3862 			err = got_path_dirname(&parent_path, s->in_repo_path);
3863 			if (err)
3864 				return err;
3865 			free(s->in_repo_path);
3866 			s->in_repo_path = parent_path;
3867 			s->thread_args.in_repo_path = s->in_repo_path;
3868 		} else if (ch == CTRL('l')) {
3869 			struct got_object_id *start_id;
3870 			err = got_repo_match_object_id(&start_id, NULL,
3871 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3872 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3873 			if (err) {
3874 				if (s->head_ref_name == NULL ||
3875 				    err->code != GOT_ERR_NOT_REF)
3876 					return err;
3877 				/* Try to cope with deleted references. */
3878 				free(s->head_ref_name);
3879 				s->head_ref_name = NULL;
3880 				err = got_repo_match_object_id(&start_id,
3881 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3882 				    &tog_refs, s->repo);
3883 				if (err)
3884 					return err;
3885 			}
3886 			free(s->start_id);
3887 			s->start_id = start_id;
3888 			s->thread_args.start_id = s->start_id;
3889 		} else /* 'B' */
3890 			s->log_branches = !s->log_branches;
3891 
3892 		if (s->thread_args.pack_fds == NULL) {
3893 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3894 			if (err)
3895 				return err;
3896 		}
3897 		err = got_repo_open(&s->thread_args.repo,
3898 		    got_repo_get_path(s->repo), NULL,
3899 		    s->thread_args.pack_fds);
3900 		if (err)
3901 			return err;
3902 		tog_free_refs();
3903 		err = tog_load_refs(s->repo, 0);
3904 		if (err)
3905 			return err;
3906 		err = got_commit_graph_open(&s->thread_args.graph,
3907 		    s->in_repo_path, !s->log_branches);
3908 		if (err)
3909 			return err;
3910 		err = got_commit_graph_iter_start(s->thread_args.graph,
3911 		    s->start_id, s->repo, NULL, NULL);
3912 		if (err)
3913 			return err;
3914 		free_commits(&s->real_commits);
3915 		free_commits(&s->limit_commits);
3916 		s->first_displayed_entry = NULL;
3917 		s->last_displayed_entry = NULL;
3918 		s->selected_entry = NULL;
3919 		s->selected = 0;
3920 		s->thread_args.log_complete = 0;
3921 		s->quit = 0;
3922 		s->thread_args.commits_needed = view->lines;
3923 		s->matched_entry = NULL;
3924 		s->search_entry = NULL;
3925 		view->offset = 0;
3926 		break;
3927 	case 'R':
3928 		view->count = 0;
3929 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3930 		break;
3931 	default:
3932 		view->count = 0;
3933 		break;
3934 	}
3935 
3936 	return err;
3937 }
3938 
3939 static const struct got_error *
3940 apply_unveil(const char *repo_path, const char *worktree_path)
3941 {
3942 	const struct got_error *error;
3943 
3944 #ifdef PROFILE
3945 	if (unveil("gmon.out", "rwc") != 0)
3946 		return got_error_from_errno2("unveil", "gmon.out");
3947 #endif
3948 	if (repo_path && unveil(repo_path, "r") != 0)
3949 		return got_error_from_errno2("unveil", repo_path);
3950 
3951 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3952 		return got_error_from_errno2("unveil", worktree_path);
3953 
3954 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3955 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3956 
3957 	error = got_privsep_unveil_exec_helpers();
3958 	if (error != NULL)
3959 		return error;
3960 
3961 	if (unveil(NULL, NULL) != 0)
3962 		return got_error_from_errno("unveil");
3963 
3964 	return NULL;
3965 }
3966 
3967 static void
3968 init_curses(void)
3969 {
3970 	/*
3971 	 * Override default signal handlers before starting ncurses.
3972 	 * This should prevent ncurses from installing its own
3973 	 * broken cleanup() signal handler.
3974 	 */
3975 	signal(SIGWINCH, tog_sigwinch);
3976 	signal(SIGPIPE, tog_sigpipe);
3977 	signal(SIGCONT, tog_sigcont);
3978 	signal(SIGINT, tog_sigint);
3979 	signal(SIGTERM, tog_sigterm);
3980 
3981 	initscr();
3982 	cbreak();
3983 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3984 	noecho();
3985 	nonl();
3986 	intrflush(stdscr, FALSE);
3987 	keypad(stdscr, TRUE);
3988 	curs_set(0);
3989 	if (getenv("TOG_COLORS") != NULL) {
3990 		start_color();
3991 		use_default_colors();
3992 	}
3993 }
3994 
3995 static const struct got_error *
3996 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3997     struct got_repository *repo, struct got_worktree *worktree)
3998 {
3999 	const struct got_error *err = NULL;
4000 
4001 	if (argc == 0) {
4002 		*in_repo_path = strdup("/");
4003 		if (*in_repo_path == NULL)
4004 			return got_error_from_errno("strdup");
4005 		return NULL;
4006 	}
4007 
4008 	if (worktree) {
4009 		const char *prefix = got_worktree_get_path_prefix(worktree);
4010 		char *p;
4011 
4012 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4013 		if (err)
4014 			return err;
4015 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4016 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4017 		    p) == -1) {
4018 			err = got_error_from_errno("asprintf");
4019 			*in_repo_path = NULL;
4020 		}
4021 		free(p);
4022 	} else
4023 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4024 
4025 	return err;
4026 }
4027 
4028 static const struct got_error *
4029 cmd_log(int argc, char *argv[])
4030 {
4031 	const struct got_error *error;
4032 	struct got_repository *repo = NULL;
4033 	struct got_worktree *worktree = NULL;
4034 	struct got_object_id *start_id = NULL;
4035 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4036 	char *start_commit = NULL, *label = NULL;
4037 	struct got_reference *ref = NULL;
4038 	const char *head_ref_name = NULL;
4039 	int ch, log_branches = 0;
4040 	struct tog_view *view;
4041 	int *pack_fds = NULL;
4042 
4043 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4044 		switch (ch) {
4045 		case 'b':
4046 			log_branches = 1;
4047 			break;
4048 		case 'c':
4049 			start_commit = optarg;
4050 			break;
4051 		case 'r':
4052 			repo_path = realpath(optarg, NULL);
4053 			if (repo_path == NULL)
4054 				return got_error_from_errno2("realpath",
4055 				    optarg);
4056 			break;
4057 		default:
4058 			usage_log();
4059 			/* NOTREACHED */
4060 		}
4061 	}
4062 
4063 	argc -= optind;
4064 	argv += optind;
4065 
4066 	if (argc > 1)
4067 		usage_log();
4068 
4069 	error = got_repo_pack_fds_open(&pack_fds);
4070 	if (error != NULL)
4071 		goto done;
4072 
4073 	if (repo_path == NULL) {
4074 		cwd = getcwd(NULL, 0);
4075 		if (cwd == NULL)
4076 			return got_error_from_errno("getcwd");
4077 		error = got_worktree_open(&worktree, cwd);
4078 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4079 			goto done;
4080 		if (worktree)
4081 			repo_path =
4082 			    strdup(got_worktree_get_repo_path(worktree));
4083 		else
4084 			repo_path = strdup(cwd);
4085 		if (repo_path == NULL) {
4086 			error = got_error_from_errno("strdup");
4087 			goto done;
4088 		}
4089 	}
4090 
4091 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4092 	if (error != NULL)
4093 		goto done;
4094 
4095 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4096 	    repo, worktree);
4097 	if (error)
4098 		goto done;
4099 
4100 	init_curses();
4101 
4102 	error = apply_unveil(got_repo_get_path(repo),
4103 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4104 	if (error)
4105 		goto done;
4106 
4107 	/* already loaded by tog_log_with_path()? */
4108 	if (TAILQ_EMPTY(&tog_refs)) {
4109 		error = tog_load_refs(repo, 0);
4110 		if (error)
4111 			goto done;
4112 	}
4113 
4114 	if (start_commit == NULL) {
4115 		error = got_repo_match_object_id(&start_id, &label,
4116 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4117 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4118 		if (error)
4119 			goto done;
4120 		head_ref_name = label;
4121 	} else {
4122 		error = got_ref_open(&ref, repo, start_commit, 0);
4123 		if (error == NULL)
4124 			head_ref_name = got_ref_get_name(ref);
4125 		else if (error->code != GOT_ERR_NOT_REF)
4126 			goto done;
4127 		error = got_repo_match_object_id(&start_id, NULL,
4128 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4129 		if (error)
4130 			goto done;
4131 	}
4132 
4133 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4134 	if (view == NULL) {
4135 		error = got_error_from_errno("view_open");
4136 		goto done;
4137 	}
4138 	error = open_log_view(view, start_id, repo, head_ref_name,
4139 	    in_repo_path, log_branches);
4140 	if (error)
4141 		goto done;
4142 	if (worktree) {
4143 		/* Release work tree lock. */
4144 		got_worktree_close(worktree);
4145 		worktree = NULL;
4146 	}
4147 	error = view_loop(view);
4148 done:
4149 	free(in_repo_path);
4150 	free(repo_path);
4151 	free(cwd);
4152 	free(start_id);
4153 	free(label);
4154 	if (ref)
4155 		got_ref_close(ref);
4156 	if (repo) {
4157 		const struct got_error *close_err = got_repo_close(repo);
4158 		if (error == NULL)
4159 			error = close_err;
4160 	}
4161 	if (worktree)
4162 		got_worktree_close(worktree);
4163 	if (pack_fds) {
4164 		const struct got_error *pack_err =
4165 		    got_repo_pack_fds_close(pack_fds);
4166 		if (error == NULL)
4167 			error = pack_err;
4168 	}
4169 	tog_free_refs();
4170 	return error;
4171 }
4172 
4173 __dead static void
4174 usage_diff(void)
4175 {
4176 	endwin();
4177 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4178 	    "object1 object2\n", getprogname());
4179 	exit(1);
4180 }
4181 
4182 static int
4183 match_line(const char *line, regex_t *regex, size_t nmatch,
4184     regmatch_t *regmatch)
4185 {
4186 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4187 }
4188 
4189 static struct tog_color *
4190 match_color(struct tog_colors *colors, const char *line)
4191 {
4192 	struct tog_color *tc = NULL;
4193 
4194 	STAILQ_FOREACH(tc, colors, entry) {
4195 		if (match_line(line, &tc->regex, 0, NULL))
4196 			return tc;
4197 	}
4198 
4199 	return NULL;
4200 }
4201 
4202 static const struct got_error *
4203 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4204     WINDOW *window, int skipcol, regmatch_t *regmatch)
4205 {
4206 	const struct got_error *err = NULL;
4207 	char *exstr = NULL;
4208 	wchar_t *wline = NULL;
4209 	int rme, rms, n, width, scrollx;
4210 	int width0 = 0, width1 = 0, width2 = 0;
4211 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4212 
4213 	*wtotal = 0;
4214 
4215 	rms = regmatch->rm_so;
4216 	rme = regmatch->rm_eo;
4217 
4218 	err = expand_tab(&exstr, line);
4219 	if (err)
4220 		return err;
4221 
4222 	/* Split the line into 3 segments, according to match offsets. */
4223 	seg0 = strndup(exstr, rms);
4224 	if (seg0 == NULL) {
4225 		err = got_error_from_errno("strndup");
4226 		goto done;
4227 	}
4228 	seg1 = strndup(exstr + rms, rme - rms);
4229 	if (seg1 == NULL) {
4230 		err = got_error_from_errno("strndup");
4231 		goto done;
4232 	}
4233 	seg2 = strdup(exstr + rme);
4234 	if (seg2 == NULL) {
4235 		err = got_error_from_errno("strndup");
4236 		goto done;
4237 	}
4238 
4239 	/* draw up to matched token if we haven't scrolled past it */
4240 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4241 	    col_tab_align, 1);
4242 	if (err)
4243 		goto done;
4244 	n = MAX(width0 - skipcol, 0);
4245 	if (n) {
4246 		free(wline);
4247 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4248 		    wlimit, col_tab_align, 1);
4249 		if (err)
4250 			goto done;
4251 		waddwstr(window, &wline[scrollx]);
4252 		wlimit -= width;
4253 		*wtotal += width;
4254 	}
4255 
4256 	if (wlimit > 0) {
4257 		int i = 0, w = 0;
4258 		size_t wlen;
4259 
4260 		free(wline);
4261 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4262 		    col_tab_align, 1);
4263 		if (err)
4264 			goto done;
4265 		wlen = wcslen(wline);
4266 		while (i < wlen) {
4267 			width = wcwidth(wline[i]);
4268 			if (width == -1) {
4269 				/* should not happen, tabs are expanded */
4270 				err = got_error(GOT_ERR_RANGE);
4271 				goto done;
4272 			}
4273 			if (width0 + w + width > skipcol)
4274 				break;
4275 			w += width;
4276 			i++;
4277 		}
4278 		/* draw (visible part of) matched token (if scrolled into it) */
4279 		if (width1 - w > 0) {
4280 			wattron(window, A_STANDOUT);
4281 			waddwstr(window, &wline[i]);
4282 			wattroff(window, A_STANDOUT);
4283 			wlimit -= (width1 - w);
4284 			*wtotal += (width1 - w);
4285 		}
4286 	}
4287 
4288 	if (wlimit > 0) {  /* draw rest of line */
4289 		free(wline);
4290 		if (skipcol > width0 + width1) {
4291 			err = format_line(&wline, &width2, &scrollx, seg2,
4292 			    skipcol - (width0 + width1), wlimit,
4293 			    col_tab_align, 1);
4294 			if (err)
4295 				goto done;
4296 			waddwstr(window, &wline[scrollx]);
4297 		} else {
4298 			err = format_line(&wline, &width2, NULL, seg2, 0,
4299 			    wlimit, col_tab_align, 1);
4300 			if (err)
4301 				goto done;
4302 			waddwstr(window, wline);
4303 		}
4304 		*wtotal += width2;
4305 	}
4306 done:
4307 	free(wline);
4308 	free(exstr);
4309 	free(seg0);
4310 	free(seg1);
4311 	free(seg2);
4312 	return err;
4313 }
4314 
4315 static int
4316 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4317 {
4318 	FILE	*f = NULL;
4319 	int	*eof, *first, *selected;
4320 
4321 	if (view->type == TOG_VIEW_DIFF) {
4322 		struct tog_diff_view_state *s = &view->state.diff;
4323 
4324 		first = &s->first_displayed_line;
4325 		selected = first;
4326 		eof = &s->eof;
4327 		f = s->f;
4328 	} else if (view->type == TOG_VIEW_HELP) {
4329 		struct tog_help_view_state *s = &view->state.help;
4330 
4331 		first = &s->first_displayed_line;
4332 		selected = first;
4333 		eof = &s->eof;
4334 		f = s->f;
4335 	} else if (view->type == TOG_VIEW_BLAME) {
4336 		struct tog_blame_view_state *s = &view->state.blame;
4337 
4338 		first = &s->first_displayed_line;
4339 		selected = &s->selected_line;
4340 		eof = &s->eof;
4341 		f = s->blame.f;
4342 	} else
4343 		return 0;
4344 
4345 	/* Center gline in the middle of the page like vi(1). */
4346 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4347 		return 0;
4348 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4349 		rewind(f);
4350 		*eof = 0;
4351 		*first = 1;
4352 		*lineno = 0;
4353 		*nprinted = 0;
4354 		return 0;
4355 	}
4356 
4357 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4358 		view->gline : (view->nlines - 3) / 2 + 1;
4359 	view->gline = 0;
4360 
4361 	return 1;
4362 }
4363 
4364 static const struct got_error *
4365 draw_file(struct tog_view *view, const char *header)
4366 {
4367 	struct tog_diff_view_state *s = &view->state.diff;
4368 	regmatch_t *regmatch = &view->regmatch;
4369 	const struct got_error *err;
4370 	int nprinted = 0;
4371 	char *line;
4372 	size_t linesize = 0;
4373 	ssize_t linelen;
4374 	wchar_t *wline;
4375 	int width;
4376 	int max_lines = view->nlines;
4377 	int nlines = s->nlines;
4378 	off_t line_offset;
4379 
4380 	s->lineno = s->first_displayed_line - 1;
4381 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4382 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4383 		return got_error_from_errno("fseek");
4384 
4385 	werase(view->window);
4386 
4387 	if (view->gline > s->nlines - 1)
4388 		view->gline = s->nlines - 1;
4389 
4390 	if (header) {
4391 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4392 		    1 : view->gline - (view->nlines - 3) / 2 :
4393 		    s->lineno + s->selected_line;
4394 
4395 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4396 			return got_error_from_errno("asprintf");
4397 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4398 		    0, 0);
4399 		free(line);
4400 		if (err)
4401 			return err;
4402 
4403 		if (view_needs_focus_indication(view))
4404 			wstandout(view->window);
4405 		waddwstr(view->window, wline);
4406 		free(wline);
4407 		wline = NULL;
4408 		while (width++ < view->ncols)
4409 			waddch(view->window, ' ');
4410 		if (view_needs_focus_indication(view))
4411 			wstandend(view->window);
4412 
4413 		if (max_lines <= 1)
4414 			return NULL;
4415 		max_lines--;
4416 	}
4417 
4418 	s->eof = 0;
4419 	view->maxx = 0;
4420 	line = NULL;
4421 	while (max_lines > 0 && nprinted < max_lines) {
4422 		enum got_diff_line_type linetype;
4423 		attr_t attr = 0;
4424 
4425 		linelen = getline(&line, &linesize, s->f);
4426 		if (linelen == -1) {
4427 			if (feof(s->f)) {
4428 				s->eof = 1;
4429 				break;
4430 			}
4431 			free(line);
4432 			return got_ferror(s->f, GOT_ERR_IO);
4433 		}
4434 
4435 		if (++s->lineno < s->first_displayed_line)
4436 			continue;
4437 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4438 			continue;
4439 		if (s->lineno == view->hiline)
4440 			attr = A_STANDOUT;
4441 
4442 		/* Set view->maxx based on full line length. */
4443 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4444 		    view->x ? 1 : 0);
4445 		if (err) {
4446 			free(line);
4447 			return err;
4448 		}
4449 		view->maxx = MAX(view->maxx, width);
4450 		free(wline);
4451 		wline = NULL;
4452 
4453 		linetype = s->lines[s->lineno].type;
4454 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4455 		    linetype < GOT_DIFF_LINE_CONTEXT)
4456 			attr |= COLOR_PAIR(linetype);
4457 		if (attr)
4458 			wattron(view->window, attr);
4459 		if (s->first_displayed_line + nprinted == s->matched_line &&
4460 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4461 			err = add_matched_line(&width, line, view->ncols, 0,
4462 			    view->window, view->x, regmatch);
4463 			if (err) {
4464 				free(line);
4465 				return err;
4466 			}
4467 		} else {
4468 			int skip;
4469 			err = format_line(&wline, &width, &skip, line,
4470 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4471 			if (err) {
4472 				free(line);
4473 				return err;
4474 			}
4475 			waddwstr(view->window, &wline[skip]);
4476 			free(wline);
4477 			wline = NULL;
4478 		}
4479 		if (s->lineno == view->hiline) {
4480 			/* highlight full gline length */
4481 			while (width++ < view->ncols)
4482 				waddch(view->window, ' ');
4483 		} else {
4484 			if (width <= view->ncols - 1)
4485 				waddch(view->window, '\n');
4486 		}
4487 		if (attr)
4488 			wattroff(view->window, attr);
4489 		if (++nprinted == 1)
4490 			s->first_displayed_line = s->lineno;
4491 	}
4492 	free(line);
4493 	if (nprinted >= 1)
4494 		s->last_displayed_line = s->first_displayed_line +
4495 		    (nprinted - 1);
4496 	else
4497 		s->last_displayed_line = s->first_displayed_line;
4498 
4499 	view_border(view);
4500 
4501 	if (s->eof) {
4502 		while (nprinted < view->nlines) {
4503 			waddch(view->window, '\n');
4504 			nprinted++;
4505 		}
4506 
4507 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4508 		    view->ncols, 0, 0);
4509 		if (err) {
4510 			return err;
4511 		}
4512 
4513 		wstandout(view->window);
4514 		waddwstr(view->window, wline);
4515 		free(wline);
4516 		wline = NULL;
4517 		wstandend(view->window);
4518 	}
4519 
4520 	return NULL;
4521 }
4522 
4523 static char *
4524 get_datestr(time_t *time, char *datebuf)
4525 {
4526 	struct tm mytm, *tm;
4527 	char *p, *s;
4528 
4529 	tm = gmtime_r(time, &mytm);
4530 	if (tm == NULL)
4531 		return NULL;
4532 	s = asctime_r(tm, datebuf);
4533 	if (s == NULL)
4534 		return NULL;
4535 	p = strchr(s, '\n');
4536 	if (p)
4537 		*p = '\0';
4538 	return s;
4539 }
4540 
4541 static const struct got_error *
4542 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4543     off_t off, uint8_t type)
4544 {
4545 	struct got_diff_line *p;
4546 
4547 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4548 	if (p == NULL)
4549 		return got_error_from_errno("reallocarray");
4550 	*lines = p;
4551 	(*lines)[*nlines].offset = off;
4552 	(*lines)[*nlines].type = type;
4553 	(*nlines)++;
4554 
4555 	return NULL;
4556 }
4557 
4558 static const struct got_error *
4559 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4560     struct got_diff_line *s_lines, size_t s_nlines)
4561 {
4562 	struct got_diff_line	*p;
4563 	char			 buf[BUFSIZ];
4564 	size_t			 i, r;
4565 
4566 	if (fseeko(src, 0L, SEEK_SET) == -1)
4567 		return got_error_from_errno("fseeko");
4568 
4569 	for (;;) {
4570 		r = fread(buf, 1, sizeof(buf), src);
4571 		if (r == 0) {
4572 			if (ferror(src))
4573 				return got_error_from_errno("fread");
4574 			if (feof(src))
4575 				break;
4576 		}
4577 		if (fwrite(buf, 1, r, dst) != r)
4578 			return got_ferror(dst, GOT_ERR_IO);
4579 	}
4580 
4581 	/*
4582 	 * The diff driver initialises the first line at offset zero when the
4583 	 * array isn't prepopulated, skip it; we already have it in *d_lines.
4584 	 */
4585 	for (i = 1; i < s_nlines; ++i)
4586 		s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4587 
4588 	--s_nlines;
4589 
4590 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4591 	if (p == NULL) {
4592 		/* d_lines is freed in close_diff_view() */
4593 		return got_error_from_errno("reallocarray");
4594 	}
4595 
4596 	*d_lines = p;
4597 
4598 	memcpy(*d_lines + *d_nlines, s_lines + 1, s_nlines * sizeof(*s_lines));
4599 	*d_nlines += s_nlines;
4600 
4601 	return NULL;
4602 }
4603 
4604 static const struct got_error *
4605 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4606     struct got_object_id *commit_id, struct got_reflist_head *refs,
4607     struct got_repository *repo, int ignore_ws, int force_text_diff,
4608     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4609 {
4610 	const struct got_error *err = NULL;
4611 	char datebuf[26], *datestr;
4612 	struct got_commit_object *commit;
4613 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4614 	time_t committer_time;
4615 	const char *author, *committer;
4616 	char *refs_str = NULL;
4617 	struct got_pathlist_entry *pe;
4618 	off_t outoff = 0;
4619 	int n;
4620 
4621 	if (refs) {
4622 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4623 		if (err)
4624 			return err;
4625 	}
4626 
4627 	err = got_object_open_as_commit(&commit, repo, commit_id);
4628 	if (err)
4629 		return err;
4630 
4631 	err = got_object_id_str(&id_str, commit_id);
4632 	if (err) {
4633 		err = got_error_from_errno("got_object_id_str");
4634 		goto done;
4635 	}
4636 
4637 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4638 	if (err)
4639 		goto done;
4640 
4641 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4642 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4643 	if (n < 0) {
4644 		err = got_error_from_errno("fprintf");
4645 		goto done;
4646 	}
4647 	outoff += n;
4648 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4649 	if (err)
4650 		goto done;
4651 
4652 	n = fprintf(outfile, "from: %s\n",
4653 	    got_object_commit_get_author(commit));
4654 	if (n < 0) {
4655 		err = got_error_from_errno("fprintf");
4656 		goto done;
4657 	}
4658 	outoff += n;
4659 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4660 	if (err)
4661 		goto done;
4662 
4663 	author = got_object_commit_get_author(commit);
4664 	committer = got_object_commit_get_committer(commit);
4665 	if (strcmp(author, committer) != 0) {
4666 		n = fprintf(outfile, "via: %s\n", committer);
4667 		if (n < 0) {
4668 			err = got_error_from_errno("fprintf");
4669 			goto done;
4670 		}
4671 		outoff += n;
4672 		err = add_line_metadata(lines, nlines, outoff,
4673 		    GOT_DIFF_LINE_AUTHOR);
4674 		if (err)
4675 			goto done;
4676 	}
4677 	committer_time = got_object_commit_get_committer_time(commit);
4678 	datestr = get_datestr(&committer_time, datebuf);
4679 	if (datestr) {
4680 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4681 		if (n < 0) {
4682 			err = got_error_from_errno("fprintf");
4683 			goto done;
4684 		}
4685 		outoff += n;
4686 		err = add_line_metadata(lines, nlines, outoff,
4687 		    GOT_DIFF_LINE_DATE);
4688 		if (err)
4689 			goto done;
4690 	}
4691 	if (got_object_commit_get_nparents(commit) > 1) {
4692 		const struct got_object_id_queue *parent_ids;
4693 		struct got_object_qid *qid;
4694 		int pn = 1;
4695 		parent_ids = got_object_commit_get_parent_ids(commit);
4696 		STAILQ_FOREACH(qid, parent_ids, entry) {
4697 			err = got_object_id_str(&id_str, &qid->id);
4698 			if (err)
4699 				goto done;
4700 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4701 			if (n < 0) {
4702 				err = got_error_from_errno("fprintf");
4703 				goto done;
4704 			}
4705 			outoff += n;
4706 			err = add_line_metadata(lines, nlines, outoff,
4707 			    GOT_DIFF_LINE_META);
4708 			if (err)
4709 				goto done;
4710 			free(id_str);
4711 			id_str = NULL;
4712 		}
4713 	}
4714 
4715 	err = got_object_commit_get_logmsg(&logmsg, commit);
4716 	if (err)
4717 		goto done;
4718 	s = logmsg;
4719 	while ((line = strsep(&s, "\n")) != NULL) {
4720 		n = fprintf(outfile, "%s\n", line);
4721 		if (n < 0) {
4722 			err = got_error_from_errno("fprintf");
4723 			goto done;
4724 		}
4725 		outoff += n;
4726 		err = add_line_metadata(lines, nlines, outoff,
4727 		    GOT_DIFF_LINE_LOGMSG);
4728 		if (err)
4729 			goto done;
4730 	}
4731 
4732 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4733 		struct got_diff_changed_path *cp = pe->data;
4734 		int pad = dsa->max_path_len - pe->path_len + 1;
4735 
4736 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4737 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4738 		    dsa->rm_cols + 1, cp->rm);
4739 		if (n < 0) {
4740 			err = got_error_from_errno("fprintf");
4741 			goto done;
4742 		}
4743 		outoff += n;
4744 		err = add_line_metadata(lines, nlines, outoff,
4745 		    GOT_DIFF_LINE_CHANGES);
4746 		if (err)
4747 			goto done;
4748 	}
4749 
4750 	fputc('\n', outfile);
4751 	outoff++;
4752 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4753 	if (err)
4754 		goto done;
4755 
4756 	n = fprintf(outfile,
4757 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4758 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4759 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4760 	if (n < 0) {
4761 		err = got_error_from_errno("fprintf");
4762 		goto done;
4763 	}
4764 	outoff += n;
4765 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4766 	if (err)
4767 		goto done;
4768 
4769 	fputc('\n', outfile);
4770 	outoff++;
4771 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4772 done:
4773 	free(id_str);
4774 	free(logmsg);
4775 	free(refs_str);
4776 	got_object_commit_close(commit);
4777 	if (err) {
4778 		free(*lines);
4779 		*lines = NULL;
4780 		*nlines = 0;
4781 	}
4782 	return err;
4783 }
4784 
4785 static const struct got_error *
4786 create_diff(struct tog_diff_view_state *s)
4787 {
4788 	const struct got_error *err = NULL;
4789 	FILE *f = NULL, *tmp_diff_file = NULL;
4790 	int obj_type;
4791 	struct got_diff_line *lines = NULL;
4792 	struct got_pathlist_head changed_paths;
4793 
4794 	TAILQ_INIT(&changed_paths);
4795 
4796 	free(s->lines);
4797 	s->lines = malloc(sizeof(*s->lines));
4798 	if (s->lines == NULL)
4799 		return got_error_from_errno("malloc");
4800 	s->nlines = 0;
4801 
4802 	f = got_opentemp();
4803 	if (f == NULL) {
4804 		err = got_error_from_errno("got_opentemp");
4805 		goto done;
4806 	}
4807 	tmp_diff_file = got_opentemp();
4808 	if (tmp_diff_file == NULL) {
4809 		err = got_error_from_errno("got_opentemp");
4810 		goto done;
4811 	}
4812 	if (s->f && fclose(s->f) == EOF) {
4813 		err = got_error_from_errno("fclose");
4814 		goto done;
4815 	}
4816 	s->f = f;
4817 
4818 	if (s->id1)
4819 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4820 	else
4821 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4822 	if (err)
4823 		goto done;
4824 
4825 	switch (obj_type) {
4826 	case GOT_OBJ_TYPE_BLOB:
4827 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4828 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4829 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4830 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4831 		    s->f);
4832 		break;
4833 	case GOT_OBJ_TYPE_TREE:
4834 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4835 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4836 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4837 		    s->force_text_diff, NULL, s->repo, s->f);
4838 		break;
4839 	case GOT_OBJ_TYPE_COMMIT: {
4840 		const struct got_object_id_queue *parent_ids;
4841 		struct got_object_qid *pid;
4842 		struct got_commit_object *commit2;
4843 		struct got_reflist_head *refs;
4844 		size_t nlines = 0;
4845 		struct got_diffstat_cb_arg dsa = {
4846 			0, 0, 0, 0, 0, 0,
4847 			&changed_paths,
4848 			s->ignore_whitespace,
4849 			s->force_text_diff,
4850 			tog_diff_algo
4851 		};
4852 
4853 		lines = malloc(sizeof(*lines));
4854 		if (lines == NULL) {
4855 			err = got_error_from_errno("malloc");
4856 			goto done;
4857 		}
4858 
4859 		/* build diff first in tmp file then append to commit info */
4860 		err = got_diff_objects_as_commits(&lines, &nlines,
4861 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4862 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4863 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4864 		if (err)
4865 			break;
4866 
4867 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4868 		if (err)
4869 			goto done;
4870 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4871 		/* Show commit info if we're diffing to a parent/root commit. */
4872 		if (s->id1 == NULL) {
4873 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4874 			    refs, s->repo, s->ignore_whitespace,
4875 			    s->force_text_diff, &dsa, s->f);
4876 			if (err)
4877 				goto done;
4878 		} else {
4879 			parent_ids = got_object_commit_get_parent_ids(commit2);
4880 			STAILQ_FOREACH(pid, parent_ids, entry) {
4881 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4882 					err = write_commit_info(&s->lines,
4883 					    &s->nlines, s->id2, refs, s->repo,
4884 					    s->ignore_whitespace,
4885 					    s->force_text_diff, &dsa, s->f);
4886 					if (err)
4887 						goto done;
4888 					break;
4889 				}
4890 			}
4891 		}
4892 		got_object_commit_close(commit2);
4893 
4894 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4895 		    lines, nlines);
4896 		break;
4897 	}
4898 	default:
4899 		err = got_error(GOT_ERR_OBJ_TYPE);
4900 		break;
4901 	}
4902 done:
4903 	free(lines);
4904 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4905 	if (s->f && fflush(s->f) != 0 && err == NULL)
4906 		err = got_error_from_errno("fflush");
4907 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4908 		err = got_error_from_errno("fclose");
4909 	return err;
4910 }
4911 
4912 static void
4913 diff_view_indicate_progress(struct tog_view *view)
4914 {
4915 	mvwaddstr(view->window, 0, 0, "diffing...");
4916 	update_panels();
4917 	doupdate();
4918 }
4919 
4920 static const struct got_error *
4921 search_start_diff_view(struct tog_view *view)
4922 {
4923 	struct tog_diff_view_state *s = &view->state.diff;
4924 
4925 	s->matched_line = 0;
4926 	return NULL;
4927 }
4928 
4929 static void
4930 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4931     size_t *nlines, int **first, int **last, int **match, int **selected)
4932 {
4933 	struct tog_diff_view_state *s = &view->state.diff;
4934 
4935 	*f = s->f;
4936 	*nlines = s->nlines;
4937 	*line_offsets = NULL;
4938 	*match = &s->matched_line;
4939 	*first = &s->first_displayed_line;
4940 	*last = &s->last_displayed_line;
4941 	*selected = &s->selected_line;
4942 }
4943 
4944 static const struct got_error *
4945 search_next_view_match(struct tog_view *view)
4946 {
4947 	const struct got_error *err = NULL;
4948 	FILE *f;
4949 	int lineno;
4950 	char *line = NULL;
4951 	size_t linesize = 0;
4952 	ssize_t linelen;
4953 	off_t *line_offsets;
4954 	size_t nlines = 0;
4955 	int *first, *last, *match, *selected;
4956 
4957 	if (!view->search_setup)
4958 		return got_error_msg(GOT_ERR_NOT_IMPL,
4959 		    "view search not supported");
4960 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4961 	    &match, &selected);
4962 
4963 	if (!view->searching) {
4964 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4965 		return NULL;
4966 	}
4967 
4968 	if (*match) {
4969 		if (view->searching == TOG_SEARCH_FORWARD)
4970 			lineno = *match + 1;
4971 		else
4972 			lineno = *match - 1;
4973 	} else
4974 		lineno = *first - 1 + *selected;
4975 
4976 	while (1) {
4977 		off_t offset;
4978 
4979 		if (lineno <= 0 || lineno > nlines) {
4980 			if (*match == 0) {
4981 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4982 				break;
4983 			}
4984 
4985 			if (view->searching == TOG_SEARCH_FORWARD)
4986 				lineno = 1;
4987 			else
4988 				lineno = nlines;
4989 		}
4990 
4991 		offset = view->type == TOG_VIEW_DIFF ?
4992 		    view->state.diff.lines[lineno - 1].offset :
4993 		    line_offsets[lineno - 1];
4994 		if (fseeko(f, offset, SEEK_SET) != 0) {
4995 			free(line);
4996 			return got_error_from_errno("fseeko");
4997 		}
4998 		linelen = getline(&line, &linesize, f);
4999 		if (linelen != -1) {
5000 			char *exstr;
5001 			err = expand_tab(&exstr, line);
5002 			if (err)
5003 				break;
5004 			if (match_line(exstr, &view->regex, 1,
5005 			    &view->regmatch)) {
5006 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5007 				*match = lineno;
5008 				free(exstr);
5009 				break;
5010 			}
5011 			free(exstr);
5012 		}
5013 		if (view->searching == TOG_SEARCH_FORWARD)
5014 			lineno++;
5015 		else
5016 			lineno--;
5017 	}
5018 	free(line);
5019 
5020 	if (*match) {
5021 		*first = *match;
5022 		*selected = 1;
5023 	}
5024 
5025 	return err;
5026 }
5027 
5028 static const struct got_error *
5029 close_diff_view(struct tog_view *view)
5030 {
5031 	const struct got_error *err = NULL;
5032 	struct tog_diff_view_state *s = &view->state.diff;
5033 
5034 	free(s->id1);
5035 	s->id1 = NULL;
5036 	free(s->id2);
5037 	s->id2 = NULL;
5038 	if (s->f && fclose(s->f) == EOF)
5039 		err = got_error_from_errno("fclose");
5040 	s->f = NULL;
5041 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5042 		err = got_error_from_errno("fclose");
5043 	s->f1 = NULL;
5044 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5045 		err = got_error_from_errno("fclose");
5046 	s->f2 = NULL;
5047 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5048 		err = got_error_from_errno("close");
5049 	s->fd1 = -1;
5050 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5051 		err = got_error_from_errno("close");
5052 	s->fd2 = -1;
5053 	free(s->lines);
5054 	s->lines = NULL;
5055 	s->nlines = 0;
5056 	return err;
5057 }
5058 
5059 static const struct got_error *
5060 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5061     struct got_object_id *id2, const char *label1, const char *label2,
5062     int diff_context, int ignore_whitespace, int force_text_diff,
5063     struct tog_view *parent_view, struct got_repository *repo)
5064 {
5065 	const struct got_error *err;
5066 	struct tog_diff_view_state *s = &view->state.diff;
5067 
5068 	memset(s, 0, sizeof(*s));
5069 	s->fd1 = -1;
5070 	s->fd2 = -1;
5071 
5072 	if (id1 != NULL && id2 != NULL) {
5073 	    int type1, type2;
5074 	    err = got_object_get_type(&type1, repo, id1);
5075 	    if (err)
5076 		return err;
5077 	    err = got_object_get_type(&type2, repo, id2);
5078 	    if (err)
5079 		return err;
5080 
5081 	    if (type1 != type2)
5082 		return got_error(GOT_ERR_OBJ_TYPE);
5083 	}
5084 	s->first_displayed_line = 1;
5085 	s->last_displayed_line = view->nlines;
5086 	s->selected_line = 1;
5087 	s->repo = repo;
5088 	s->id1 = id1;
5089 	s->id2 = id2;
5090 	s->label1 = label1;
5091 	s->label2 = label2;
5092 
5093 	if (id1) {
5094 		s->id1 = got_object_id_dup(id1);
5095 		if (s->id1 == NULL)
5096 			return got_error_from_errno("got_object_id_dup");
5097 	} else
5098 		s->id1 = NULL;
5099 
5100 	s->id2 = got_object_id_dup(id2);
5101 	if (s->id2 == NULL) {
5102 		err = got_error_from_errno("got_object_id_dup");
5103 		goto done;
5104 	}
5105 
5106 	s->f1 = got_opentemp();
5107 	if (s->f1 == NULL) {
5108 		err = got_error_from_errno("got_opentemp");
5109 		goto done;
5110 	}
5111 
5112 	s->f2 = got_opentemp();
5113 	if (s->f2 == NULL) {
5114 		err = got_error_from_errno("got_opentemp");
5115 		goto done;
5116 	}
5117 
5118 	s->fd1 = got_opentempfd();
5119 	if (s->fd1 == -1) {
5120 		err = got_error_from_errno("got_opentempfd");
5121 		goto done;
5122 	}
5123 
5124 	s->fd2 = got_opentempfd();
5125 	if (s->fd2 == -1) {
5126 		err = got_error_from_errno("got_opentempfd");
5127 		goto done;
5128 	}
5129 
5130 	s->diff_context = diff_context;
5131 	s->ignore_whitespace = ignore_whitespace;
5132 	s->force_text_diff = force_text_diff;
5133 	s->parent_view = parent_view;
5134 	s->repo = repo;
5135 
5136 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5137 		int rc;
5138 
5139 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5140 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5141 		if (rc != ERR)
5142 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5143 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5144 		if (rc != ERR)
5145 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5146 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5147 		if (rc != ERR)
5148 			rc = init_pair(GOT_DIFF_LINE_META,
5149 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5150 		if (rc != ERR)
5151 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5152 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5153 		if (rc != ERR)
5154 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5155 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5156 		if (rc != ERR)
5157 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5158 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5159 		if (rc != ERR)
5160 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5161 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5162 		if (rc != ERR)
5163 			rc = init_pair(GOT_DIFF_LINE_DATE,
5164 			    get_color_value("TOG_COLOR_DATE"), -1);
5165 		if (rc == ERR) {
5166 			err = got_error(GOT_ERR_RANGE);
5167 			goto done;
5168 		}
5169 	}
5170 
5171 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5172 	    view_is_splitscreen(view))
5173 		show_log_view(parent_view); /* draw border */
5174 	diff_view_indicate_progress(view);
5175 
5176 	err = create_diff(s);
5177 
5178 	view->show = show_diff_view;
5179 	view->input = input_diff_view;
5180 	view->reset = reset_diff_view;
5181 	view->close = close_diff_view;
5182 	view->search_start = search_start_diff_view;
5183 	view->search_setup = search_setup_diff_view;
5184 	view->search_next = search_next_view_match;
5185 done:
5186 	if (err)
5187 		close_diff_view(view);
5188 	return err;
5189 }
5190 
5191 static const struct got_error *
5192 show_diff_view(struct tog_view *view)
5193 {
5194 	const struct got_error *err;
5195 	struct tog_diff_view_state *s = &view->state.diff;
5196 	char *id_str1 = NULL, *id_str2, *header;
5197 	const char *label1, *label2;
5198 
5199 	if (s->id1) {
5200 		err = got_object_id_str(&id_str1, s->id1);
5201 		if (err)
5202 			return err;
5203 		label1 = s->label1 ? s->label1 : id_str1;
5204 	} else
5205 		label1 = "/dev/null";
5206 
5207 	err = got_object_id_str(&id_str2, s->id2);
5208 	if (err)
5209 		return err;
5210 	label2 = s->label2 ? s->label2 : id_str2;
5211 
5212 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5213 		err = got_error_from_errno("asprintf");
5214 		free(id_str1);
5215 		free(id_str2);
5216 		return err;
5217 	}
5218 	free(id_str1);
5219 	free(id_str2);
5220 
5221 	err = draw_file(view, header);
5222 	free(header);
5223 	return err;
5224 }
5225 
5226 static const struct got_error *
5227 set_selected_commit(struct tog_diff_view_state *s,
5228     struct commit_queue_entry *entry)
5229 {
5230 	const struct got_error *err;
5231 	const struct got_object_id_queue *parent_ids;
5232 	struct got_commit_object *selected_commit;
5233 	struct got_object_qid *pid;
5234 
5235 	free(s->id2);
5236 	s->id2 = got_object_id_dup(entry->id);
5237 	if (s->id2 == NULL)
5238 		return got_error_from_errno("got_object_id_dup");
5239 
5240 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5241 	if (err)
5242 		return err;
5243 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5244 	free(s->id1);
5245 	pid = STAILQ_FIRST(parent_ids);
5246 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5247 	got_object_commit_close(selected_commit);
5248 	return NULL;
5249 }
5250 
5251 static const struct got_error *
5252 reset_diff_view(struct tog_view *view)
5253 {
5254 	struct tog_diff_view_state *s = &view->state.diff;
5255 
5256 	view->count = 0;
5257 	wclear(view->window);
5258 	s->first_displayed_line = 1;
5259 	s->last_displayed_line = view->nlines;
5260 	s->matched_line = 0;
5261 	diff_view_indicate_progress(view);
5262 	return create_diff(s);
5263 }
5264 
5265 static void
5266 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5267 {
5268 	int start, i;
5269 
5270 	i = start = s->first_displayed_line - 1;
5271 
5272 	while (s->lines[i].type != type) {
5273 		if (i == 0)
5274 			i = s->nlines - 1;
5275 		if (--i == start)
5276 			return; /* do nothing, requested type not in file */
5277 	}
5278 
5279 	s->selected_line = 1;
5280 	s->first_displayed_line = i;
5281 }
5282 
5283 static void
5284 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5285 {
5286 	int start, i;
5287 
5288 	i = start = s->first_displayed_line + 1;
5289 
5290 	while (s->lines[i].type != type) {
5291 		if (i == s->nlines - 1)
5292 			i = 0;
5293 		if (++i == start)
5294 			return; /* do nothing, requested type not in file */
5295 	}
5296 
5297 	s->selected_line = 1;
5298 	s->first_displayed_line = i;
5299 }
5300 
5301 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5302     int, int, int);
5303 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5304     int, int);
5305 
5306 static const struct got_error *
5307 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5308 {
5309 	const struct got_error *err = NULL;
5310 	struct tog_diff_view_state *s = &view->state.diff;
5311 	struct tog_log_view_state *ls;
5312 	struct commit_queue_entry *old_selected_entry;
5313 	char *line = NULL;
5314 	size_t linesize = 0;
5315 	ssize_t linelen;
5316 	int i, nscroll = view->nlines - 1, up = 0;
5317 
5318 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5319 
5320 	switch (ch) {
5321 	case '0':
5322 	case '$':
5323 	case KEY_RIGHT:
5324 	case 'l':
5325 	case KEY_LEFT:
5326 	case 'h':
5327 		horizontal_scroll_input(view, ch);
5328 		break;
5329 	case 'a':
5330 	case 'w':
5331 		if (ch == 'a') {
5332 			s->force_text_diff = !s->force_text_diff;
5333 			view->action = s->force_text_diff ?
5334 			    "force ASCII text enabled" :
5335 			    "force ASCII text disabled";
5336 		}
5337 		else if (ch == 'w') {
5338 			s->ignore_whitespace = !s->ignore_whitespace;
5339 			view->action = s->ignore_whitespace ?
5340 			    "ignore whitespace enabled" :
5341 			    "ignore whitespace disabled";
5342 		}
5343 		err = reset_diff_view(view);
5344 		break;
5345 	case 'g':
5346 	case KEY_HOME:
5347 		s->first_displayed_line = 1;
5348 		view->count = 0;
5349 		break;
5350 	case 'G':
5351 	case KEY_END:
5352 		view->count = 0;
5353 		if (s->eof)
5354 			break;
5355 
5356 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5357 		s->eof = 1;
5358 		break;
5359 	case 'k':
5360 	case KEY_UP:
5361 	case CTRL('p'):
5362 		if (s->first_displayed_line > 1)
5363 			s->first_displayed_line--;
5364 		else
5365 			view->count = 0;
5366 		break;
5367 	case CTRL('u'):
5368 	case 'u':
5369 		nscroll /= 2;
5370 		/* FALL THROUGH */
5371 	case KEY_PPAGE:
5372 	case CTRL('b'):
5373 	case 'b':
5374 		if (s->first_displayed_line == 1) {
5375 			view->count = 0;
5376 			break;
5377 		}
5378 		i = 0;
5379 		while (i++ < nscroll && s->first_displayed_line > 1)
5380 			s->first_displayed_line--;
5381 		break;
5382 	case 'j':
5383 	case KEY_DOWN:
5384 	case CTRL('n'):
5385 		if (!s->eof)
5386 			s->first_displayed_line++;
5387 		else
5388 			view->count = 0;
5389 		break;
5390 	case CTRL('d'):
5391 	case 'd':
5392 		nscroll /= 2;
5393 		/* FALL THROUGH */
5394 	case KEY_NPAGE:
5395 	case CTRL('f'):
5396 	case 'f':
5397 	case ' ':
5398 		if (s->eof) {
5399 			view->count = 0;
5400 			break;
5401 		}
5402 		i = 0;
5403 		while (!s->eof && i++ < nscroll) {
5404 			linelen = getline(&line, &linesize, s->f);
5405 			s->first_displayed_line++;
5406 			if (linelen == -1) {
5407 				if (feof(s->f)) {
5408 					s->eof = 1;
5409 				} else
5410 					err = got_ferror(s->f, GOT_ERR_IO);
5411 				break;
5412 			}
5413 		}
5414 		free(line);
5415 		break;
5416 	case '(':
5417 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5418 		break;
5419 	case ')':
5420 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5421 		break;
5422 	case '{':
5423 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5424 		break;
5425 	case '}':
5426 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5427 		break;
5428 	case '[':
5429 		if (s->diff_context > 0) {
5430 			s->diff_context--;
5431 			s->matched_line = 0;
5432 			diff_view_indicate_progress(view);
5433 			err = create_diff(s);
5434 			if (s->first_displayed_line + view->nlines - 1 >
5435 			    s->nlines) {
5436 				s->first_displayed_line = 1;
5437 				s->last_displayed_line = view->nlines;
5438 			}
5439 		} else
5440 			view->count = 0;
5441 		break;
5442 	case ']':
5443 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5444 			s->diff_context++;
5445 			s->matched_line = 0;
5446 			diff_view_indicate_progress(view);
5447 			err = create_diff(s);
5448 		} else
5449 			view->count = 0;
5450 		break;
5451 	case '<':
5452 	case ',':
5453 	case 'K':
5454 		up = 1;
5455 		/* FALL THROUGH */
5456 	case '>':
5457 	case '.':
5458 	case 'J':
5459 		if (s->parent_view == NULL) {
5460 			view->count = 0;
5461 			break;
5462 		}
5463 		s->parent_view->count = view->count;
5464 
5465 		if (s->parent_view->type == TOG_VIEW_LOG) {
5466 			ls = &s->parent_view->state.log;
5467 			old_selected_entry = ls->selected_entry;
5468 
5469 			err = input_log_view(NULL, s->parent_view,
5470 			    up ? KEY_UP : KEY_DOWN);
5471 			if (err)
5472 				break;
5473 			view->count = s->parent_view->count;
5474 
5475 			if (old_selected_entry == ls->selected_entry)
5476 				break;
5477 
5478 			err = set_selected_commit(s, ls->selected_entry);
5479 			if (err)
5480 				break;
5481 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5482 			struct tog_blame_view_state *bs;
5483 			struct got_object_id *id, *prev_id;
5484 
5485 			bs = &s->parent_view->state.blame;
5486 			prev_id = get_annotation_for_line(bs->blame.lines,
5487 			    bs->blame.nlines, bs->last_diffed_line);
5488 
5489 			err = input_blame_view(&view, s->parent_view,
5490 			    up ? KEY_UP : KEY_DOWN);
5491 			if (err)
5492 				break;
5493 			view->count = s->parent_view->count;
5494 
5495 			if (prev_id == NULL)
5496 				break;
5497 			id = get_selected_commit_id(bs->blame.lines,
5498 			    bs->blame.nlines, bs->first_displayed_line,
5499 			    bs->selected_line);
5500 			if (id == NULL)
5501 				break;
5502 
5503 			if (!got_object_id_cmp(prev_id, id))
5504 				break;
5505 
5506 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5507 			if (err)
5508 				break;
5509 		}
5510 		s->first_displayed_line = 1;
5511 		s->last_displayed_line = view->nlines;
5512 		s->matched_line = 0;
5513 		view->x = 0;
5514 
5515 		diff_view_indicate_progress(view);
5516 		err = create_diff(s);
5517 		break;
5518 	default:
5519 		view->count = 0;
5520 		break;
5521 	}
5522 
5523 	return err;
5524 }
5525 
5526 static const struct got_error *
5527 cmd_diff(int argc, char *argv[])
5528 {
5529 	const struct got_error *error = NULL;
5530 	struct got_repository *repo = NULL;
5531 	struct got_worktree *worktree = NULL;
5532 	struct got_object_id *id1 = NULL, *id2 = NULL;
5533 	char *repo_path = NULL, *cwd = NULL;
5534 	char *id_str1 = NULL, *id_str2 = NULL;
5535 	char *label1 = NULL, *label2 = NULL;
5536 	int diff_context = 3, ignore_whitespace = 0;
5537 	int ch, force_text_diff = 0;
5538 	const char *errstr;
5539 	struct tog_view *view;
5540 	int *pack_fds = NULL;
5541 
5542 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5543 		switch (ch) {
5544 		case 'a':
5545 			force_text_diff = 1;
5546 			break;
5547 		case 'C':
5548 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5549 			    &errstr);
5550 			if (errstr != NULL)
5551 				errx(1, "number of context lines is %s: %s",
5552 				    errstr, errstr);
5553 			break;
5554 		case 'r':
5555 			repo_path = realpath(optarg, NULL);
5556 			if (repo_path == NULL)
5557 				return got_error_from_errno2("realpath",
5558 				    optarg);
5559 			got_path_strip_trailing_slashes(repo_path);
5560 			break;
5561 		case 'w':
5562 			ignore_whitespace = 1;
5563 			break;
5564 		default:
5565 			usage_diff();
5566 			/* NOTREACHED */
5567 		}
5568 	}
5569 
5570 	argc -= optind;
5571 	argv += optind;
5572 
5573 	if (argc == 0) {
5574 		usage_diff(); /* TODO show local worktree changes */
5575 	} else if (argc == 2) {
5576 		id_str1 = argv[0];
5577 		id_str2 = argv[1];
5578 	} else
5579 		usage_diff();
5580 
5581 	error = got_repo_pack_fds_open(&pack_fds);
5582 	if (error)
5583 		goto done;
5584 
5585 	if (repo_path == NULL) {
5586 		cwd = getcwd(NULL, 0);
5587 		if (cwd == NULL)
5588 			return got_error_from_errno("getcwd");
5589 		error = got_worktree_open(&worktree, cwd);
5590 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5591 			goto done;
5592 		if (worktree)
5593 			repo_path =
5594 			    strdup(got_worktree_get_repo_path(worktree));
5595 		else
5596 			repo_path = strdup(cwd);
5597 		if (repo_path == NULL) {
5598 			error = got_error_from_errno("strdup");
5599 			goto done;
5600 		}
5601 	}
5602 
5603 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5604 	if (error)
5605 		goto done;
5606 
5607 	init_curses();
5608 
5609 	error = apply_unveil(got_repo_get_path(repo), NULL);
5610 	if (error)
5611 		goto done;
5612 
5613 	error = tog_load_refs(repo, 0);
5614 	if (error)
5615 		goto done;
5616 
5617 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5618 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5619 	if (error)
5620 		goto done;
5621 
5622 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5623 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5624 	if (error)
5625 		goto done;
5626 
5627 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5628 	if (view == NULL) {
5629 		error = got_error_from_errno("view_open");
5630 		goto done;
5631 	}
5632 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5633 	    ignore_whitespace, force_text_diff, NULL,  repo);
5634 	if (error)
5635 		goto done;
5636 	error = view_loop(view);
5637 done:
5638 	free(label1);
5639 	free(label2);
5640 	free(repo_path);
5641 	free(cwd);
5642 	if (repo) {
5643 		const struct got_error *close_err = got_repo_close(repo);
5644 		if (error == NULL)
5645 			error = close_err;
5646 	}
5647 	if (worktree)
5648 		got_worktree_close(worktree);
5649 	if (pack_fds) {
5650 		const struct got_error *pack_err =
5651 		    got_repo_pack_fds_close(pack_fds);
5652 		if (error == NULL)
5653 			error = pack_err;
5654 	}
5655 	tog_free_refs();
5656 	return error;
5657 }
5658 
5659 __dead static void
5660 usage_blame(void)
5661 {
5662 	endwin();
5663 	fprintf(stderr,
5664 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5665 	    getprogname());
5666 	exit(1);
5667 }
5668 
5669 struct tog_blame_line {
5670 	int annotated;
5671 	struct got_object_id *id;
5672 };
5673 
5674 static const struct got_error *
5675 draw_blame(struct tog_view *view)
5676 {
5677 	struct tog_blame_view_state *s = &view->state.blame;
5678 	struct tog_blame *blame = &s->blame;
5679 	regmatch_t *regmatch = &view->regmatch;
5680 	const struct got_error *err;
5681 	int lineno = 0, nprinted = 0;
5682 	char *line = NULL;
5683 	size_t linesize = 0;
5684 	ssize_t linelen;
5685 	wchar_t *wline;
5686 	int width;
5687 	struct tog_blame_line *blame_line;
5688 	struct got_object_id *prev_id = NULL;
5689 	char *id_str;
5690 	struct tog_color *tc;
5691 
5692 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5693 	if (err)
5694 		return err;
5695 
5696 	rewind(blame->f);
5697 	werase(view->window);
5698 
5699 	if (asprintf(&line, "commit %s", id_str) == -1) {
5700 		err = got_error_from_errno("asprintf");
5701 		free(id_str);
5702 		return err;
5703 	}
5704 
5705 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5706 	free(line);
5707 	line = NULL;
5708 	if (err)
5709 		return err;
5710 	if (view_needs_focus_indication(view))
5711 		wstandout(view->window);
5712 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5713 	if (tc)
5714 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5715 	waddwstr(view->window, wline);
5716 	while (width++ < view->ncols)
5717 		waddch(view->window, ' ');
5718 	if (tc)
5719 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5720 	if (view_needs_focus_indication(view))
5721 		wstandend(view->window);
5722 	free(wline);
5723 	wline = NULL;
5724 
5725 	if (view->gline > blame->nlines)
5726 		view->gline = blame->nlines;
5727 
5728 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5729 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5730 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5731 		free(id_str);
5732 		return got_error_from_errno("asprintf");
5733 	}
5734 	free(id_str);
5735 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5736 	free(line);
5737 	line = NULL;
5738 	if (err)
5739 		return err;
5740 	waddwstr(view->window, wline);
5741 	free(wline);
5742 	wline = NULL;
5743 	if (width < view->ncols - 1)
5744 		waddch(view->window, '\n');
5745 
5746 	s->eof = 0;
5747 	view->maxx = 0;
5748 	while (nprinted < view->nlines - 2) {
5749 		linelen = getline(&line, &linesize, blame->f);
5750 		if (linelen == -1) {
5751 			if (feof(blame->f)) {
5752 				s->eof = 1;
5753 				break;
5754 			}
5755 			free(line);
5756 			return got_ferror(blame->f, GOT_ERR_IO);
5757 		}
5758 		if (++lineno < s->first_displayed_line)
5759 			continue;
5760 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5761 			continue;
5762 
5763 		/* Set view->maxx based on full line length. */
5764 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5765 		if (err) {
5766 			free(line);
5767 			return err;
5768 		}
5769 		free(wline);
5770 		wline = NULL;
5771 		view->maxx = MAX(view->maxx, width);
5772 
5773 		if (nprinted == s->selected_line - 1)
5774 			wstandout(view->window);
5775 
5776 		if (blame->nlines > 0) {
5777 			blame_line = &blame->lines[lineno - 1];
5778 			if (blame_line->annotated && prev_id &&
5779 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5780 			    !(nprinted == s->selected_line - 1)) {
5781 				waddstr(view->window, "        ");
5782 			} else if (blame_line->annotated) {
5783 				char *id_str;
5784 				err = got_object_id_str(&id_str,
5785 				    blame_line->id);
5786 				if (err) {
5787 					free(line);
5788 					return err;
5789 				}
5790 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5791 				if (tc)
5792 					wattr_on(view->window,
5793 					    COLOR_PAIR(tc->colorpair), NULL);
5794 				wprintw(view->window, "%.8s", id_str);
5795 				if (tc)
5796 					wattr_off(view->window,
5797 					    COLOR_PAIR(tc->colorpair), NULL);
5798 				free(id_str);
5799 				prev_id = blame_line->id;
5800 			} else {
5801 				waddstr(view->window, "........");
5802 				prev_id = NULL;
5803 			}
5804 		} else {
5805 			waddstr(view->window, "........");
5806 			prev_id = NULL;
5807 		}
5808 
5809 		if (nprinted == s->selected_line - 1)
5810 			wstandend(view->window);
5811 		waddstr(view->window, " ");
5812 
5813 		if (view->ncols <= 9) {
5814 			width = 9;
5815 		} else if (s->first_displayed_line + nprinted ==
5816 		    s->matched_line &&
5817 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5818 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5819 			    view->window, view->x, regmatch);
5820 			if (err) {
5821 				free(line);
5822 				return err;
5823 			}
5824 			width += 9;
5825 		} else {
5826 			int skip;
5827 			err = format_line(&wline, &width, &skip, line,
5828 			    view->x, view->ncols - 9, 9, 1);
5829 			if (err) {
5830 				free(line);
5831 				return err;
5832 			}
5833 			waddwstr(view->window, &wline[skip]);
5834 			width += 9;
5835 			free(wline);
5836 			wline = NULL;
5837 		}
5838 
5839 		if (width <= view->ncols - 1)
5840 			waddch(view->window, '\n');
5841 		if (++nprinted == 1)
5842 			s->first_displayed_line = lineno;
5843 	}
5844 	free(line);
5845 	s->last_displayed_line = lineno;
5846 
5847 	view_border(view);
5848 
5849 	return NULL;
5850 }
5851 
5852 static const struct got_error *
5853 blame_cb(void *arg, int nlines, int lineno,
5854     struct got_commit_object *commit, struct got_object_id *id)
5855 {
5856 	const struct got_error *err = NULL;
5857 	struct tog_blame_cb_args *a = arg;
5858 	struct tog_blame_line *line;
5859 	int errcode;
5860 
5861 	if (nlines != a->nlines ||
5862 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5863 		return got_error(GOT_ERR_RANGE);
5864 
5865 	errcode = pthread_mutex_lock(&tog_mutex);
5866 	if (errcode)
5867 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5868 
5869 	if (*a->quit) {	/* user has quit the blame view */
5870 		err = got_error(GOT_ERR_ITER_COMPLETED);
5871 		goto done;
5872 	}
5873 
5874 	if (lineno == -1)
5875 		goto done; /* no change in this commit */
5876 
5877 	line = &a->lines[lineno - 1];
5878 	if (line->annotated)
5879 		goto done;
5880 
5881 	line->id = got_object_id_dup(id);
5882 	if (line->id == NULL) {
5883 		err = got_error_from_errno("got_object_id_dup");
5884 		goto done;
5885 	}
5886 	line->annotated = 1;
5887 done:
5888 	errcode = pthread_mutex_unlock(&tog_mutex);
5889 	if (errcode)
5890 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5891 	return err;
5892 }
5893 
5894 static void *
5895 blame_thread(void *arg)
5896 {
5897 	const struct got_error *err, *close_err;
5898 	struct tog_blame_thread_args *ta = arg;
5899 	struct tog_blame_cb_args *a = ta->cb_args;
5900 	int errcode, fd1 = -1, fd2 = -1;
5901 	FILE *f1 = NULL, *f2 = NULL;
5902 
5903 	fd1 = got_opentempfd();
5904 	if (fd1 == -1)
5905 		return (void *)got_error_from_errno("got_opentempfd");
5906 
5907 	fd2 = got_opentempfd();
5908 	if (fd2 == -1) {
5909 		err = got_error_from_errno("got_opentempfd");
5910 		goto done;
5911 	}
5912 
5913 	f1 = got_opentemp();
5914 	if (f1 == NULL) {
5915 		err = (void *)got_error_from_errno("got_opentemp");
5916 		goto done;
5917 	}
5918 	f2 = got_opentemp();
5919 	if (f2 == NULL) {
5920 		err = (void *)got_error_from_errno("got_opentemp");
5921 		goto done;
5922 	}
5923 
5924 	err = block_signals_used_by_main_thread();
5925 	if (err)
5926 		goto done;
5927 
5928 	err = got_blame(ta->path, a->commit_id, ta->repo,
5929 	    tog_diff_algo, blame_cb, ta->cb_args,
5930 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5931 	if (err && err->code == GOT_ERR_CANCELLED)
5932 		err = NULL;
5933 
5934 	errcode = pthread_mutex_lock(&tog_mutex);
5935 	if (errcode) {
5936 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5937 		goto done;
5938 	}
5939 
5940 	close_err = got_repo_close(ta->repo);
5941 	if (err == NULL)
5942 		err = close_err;
5943 	ta->repo = NULL;
5944 	*ta->complete = 1;
5945 
5946 	errcode = pthread_mutex_unlock(&tog_mutex);
5947 	if (errcode && err == NULL)
5948 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5949 
5950 done:
5951 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5952 		err = got_error_from_errno("close");
5953 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5954 		err = got_error_from_errno("close");
5955 	if (f1 && fclose(f1) == EOF && err == NULL)
5956 		err = got_error_from_errno("fclose");
5957 	if (f2 && fclose(f2) == EOF && err == NULL)
5958 		err = got_error_from_errno("fclose");
5959 
5960 	return (void *)err;
5961 }
5962 
5963 static struct got_object_id *
5964 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5965     int first_displayed_line, int selected_line)
5966 {
5967 	struct tog_blame_line *line;
5968 
5969 	if (nlines <= 0)
5970 		return NULL;
5971 
5972 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5973 	if (!line->annotated)
5974 		return NULL;
5975 
5976 	return line->id;
5977 }
5978 
5979 static struct got_object_id *
5980 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5981     int lineno)
5982 {
5983 	struct tog_blame_line *line;
5984 
5985 	if (nlines <= 0 || lineno >= nlines)
5986 		return NULL;
5987 
5988 	line = &lines[lineno - 1];
5989 	if (!line->annotated)
5990 		return NULL;
5991 
5992 	return line->id;
5993 }
5994 
5995 static const struct got_error *
5996 stop_blame(struct tog_blame *blame)
5997 {
5998 	const struct got_error *err = NULL;
5999 	int i;
6000 
6001 	if (blame->thread) {
6002 		int errcode;
6003 		errcode = pthread_mutex_unlock(&tog_mutex);
6004 		if (errcode)
6005 			return got_error_set_errno(errcode,
6006 			    "pthread_mutex_unlock");
6007 		errcode = pthread_join(blame->thread, (void **)&err);
6008 		if (errcode)
6009 			return got_error_set_errno(errcode, "pthread_join");
6010 		errcode = pthread_mutex_lock(&tog_mutex);
6011 		if (errcode)
6012 			return got_error_set_errno(errcode,
6013 			    "pthread_mutex_lock");
6014 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6015 			err = NULL;
6016 		blame->thread = NULL;
6017 	}
6018 	if (blame->thread_args.repo) {
6019 		const struct got_error *close_err;
6020 		close_err = got_repo_close(blame->thread_args.repo);
6021 		if (err == NULL)
6022 			err = close_err;
6023 		blame->thread_args.repo = NULL;
6024 	}
6025 	if (blame->f) {
6026 		if (fclose(blame->f) == EOF && err == NULL)
6027 			err = got_error_from_errno("fclose");
6028 		blame->f = NULL;
6029 	}
6030 	if (blame->lines) {
6031 		for (i = 0; i < blame->nlines; i++)
6032 			free(blame->lines[i].id);
6033 		free(blame->lines);
6034 		blame->lines = NULL;
6035 	}
6036 	free(blame->cb_args.commit_id);
6037 	blame->cb_args.commit_id = NULL;
6038 	if (blame->pack_fds) {
6039 		const struct got_error *pack_err =
6040 		    got_repo_pack_fds_close(blame->pack_fds);
6041 		if (err == NULL)
6042 			err = pack_err;
6043 		blame->pack_fds = NULL;
6044 	}
6045 	return err;
6046 }
6047 
6048 static const struct got_error *
6049 cancel_blame_view(void *arg)
6050 {
6051 	const struct got_error *err = NULL;
6052 	int *done = arg;
6053 	int errcode;
6054 
6055 	errcode = pthread_mutex_lock(&tog_mutex);
6056 	if (errcode)
6057 		return got_error_set_errno(errcode,
6058 		    "pthread_mutex_unlock");
6059 
6060 	if (*done)
6061 		err = got_error(GOT_ERR_CANCELLED);
6062 
6063 	errcode = pthread_mutex_unlock(&tog_mutex);
6064 	if (errcode)
6065 		return got_error_set_errno(errcode,
6066 		    "pthread_mutex_lock");
6067 
6068 	return err;
6069 }
6070 
6071 static const struct got_error *
6072 run_blame(struct tog_view *view)
6073 {
6074 	struct tog_blame_view_state *s = &view->state.blame;
6075 	struct tog_blame *blame = &s->blame;
6076 	const struct got_error *err = NULL;
6077 	struct got_commit_object *commit = NULL;
6078 	struct got_blob_object *blob = NULL;
6079 	struct got_repository *thread_repo = NULL;
6080 	struct got_object_id *obj_id = NULL;
6081 	int obj_type, fd = -1;
6082 	int *pack_fds = NULL;
6083 
6084 	err = got_object_open_as_commit(&commit, s->repo,
6085 	    &s->blamed_commit->id);
6086 	if (err)
6087 		return err;
6088 
6089 	fd = got_opentempfd();
6090 	if (fd == -1) {
6091 		err = got_error_from_errno("got_opentempfd");
6092 		goto done;
6093 	}
6094 
6095 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6096 	if (err)
6097 		goto done;
6098 
6099 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6100 	if (err)
6101 		goto done;
6102 
6103 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6104 		err = got_error(GOT_ERR_OBJ_TYPE);
6105 		goto done;
6106 	}
6107 
6108 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6109 	if (err)
6110 		goto done;
6111 	blame->f = got_opentemp();
6112 	if (blame->f == NULL) {
6113 		err = got_error_from_errno("got_opentemp");
6114 		goto done;
6115 	}
6116 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6117 	    &blame->line_offsets, blame->f, blob);
6118 	if (err)
6119 		goto done;
6120 	if (blame->nlines == 0) {
6121 		s->blame_complete = 1;
6122 		goto done;
6123 	}
6124 
6125 	/* Don't include \n at EOF in the blame line count. */
6126 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6127 		blame->nlines--;
6128 
6129 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6130 	if (blame->lines == NULL) {
6131 		err = got_error_from_errno("calloc");
6132 		goto done;
6133 	}
6134 
6135 	err = got_repo_pack_fds_open(&pack_fds);
6136 	if (err)
6137 		goto done;
6138 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6139 	    pack_fds);
6140 	if (err)
6141 		goto done;
6142 
6143 	blame->pack_fds = pack_fds;
6144 	blame->cb_args.view = view;
6145 	blame->cb_args.lines = blame->lines;
6146 	blame->cb_args.nlines = blame->nlines;
6147 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6148 	if (blame->cb_args.commit_id == NULL) {
6149 		err = got_error_from_errno("got_object_id_dup");
6150 		goto done;
6151 	}
6152 	blame->cb_args.quit = &s->done;
6153 
6154 	blame->thread_args.path = s->path;
6155 	blame->thread_args.repo = thread_repo;
6156 	blame->thread_args.cb_args = &blame->cb_args;
6157 	blame->thread_args.complete = &s->blame_complete;
6158 	blame->thread_args.cancel_cb = cancel_blame_view;
6159 	blame->thread_args.cancel_arg = &s->done;
6160 	s->blame_complete = 0;
6161 
6162 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6163 		s->first_displayed_line = 1;
6164 		s->last_displayed_line = view->nlines;
6165 		s->selected_line = 1;
6166 	}
6167 	s->matched_line = 0;
6168 
6169 done:
6170 	if (commit)
6171 		got_object_commit_close(commit);
6172 	if (fd != -1 && close(fd) == -1 && err == NULL)
6173 		err = got_error_from_errno("close");
6174 	if (blob)
6175 		got_object_blob_close(blob);
6176 	free(obj_id);
6177 	if (err)
6178 		stop_blame(blame);
6179 	return err;
6180 }
6181 
6182 static const struct got_error *
6183 open_blame_view(struct tog_view *view, char *path,
6184     struct got_object_id *commit_id, struct got_repository *repo)
6185 {
6186 	const struct got_error *err = NULL;
6187 	struct tog_blame_view_state *s = &view->state.blame;
6188 
6189 	STAILQ_INIT(&s->blamed_commits);
6190 
6191 	s->path = strdup(path);
6192 	if (s->path == NULL)
6193 		return got_error_from_errno("strdup");
6194 
6195 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6196 	if (err) {
6197 		free(s->path);
6198 		return err;
6199 	}
6200 
6201 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6202 	s->first_displayed_line = 1;
6203 	s->last_displayed_line = view->nlines;
6204 	s->selected_line = 1;
6205 	s->blame_complete = 0;
6206 	s->repo = repo;
6207 	s->commit_id = commit_id;
6208 	memset(&s->blame, 0, sizeof(s->blame));
6209 
6210 	STAILQ_INIT(&s->colors);
6211 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6212 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6213 		    get_color_value("TOG_COLOR_COMMIT"));
6214 		if (err)
6215 			return err;
6216 	}
6217 
6218 	view->show = show_blame_view;
6219 	view->input = input_blame_view;
6220 	view->reset = reset_blame_view;
6221 	view->close = close_blame_view;
6222 	view->search_start = search_start_blame_view;
6223 	view->search_setup = search_setup_blame_view;
6224 	view->search_next = search_next_view_match;
6225 
6226 	return run_blame(view);
6227 }
6228 
6229 static const struct got_error *
6230 close_blame_view(struct tog_view *view)
6231 {
6232 	const struct got_error *err = NULL;
6233 	struct tog_blame_view_state *s = &view->state.blame;
6234 
6235 	if (s->blame.thread)
6236 		err = stop_blame(&s->blame);
6237 
6238 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6239 		struct got_object_qid *blamed_commit;
6240 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6241 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6242 		got_object_qid_free(blamed_commit);
6243 	}
6244 
6245 	free(s->path);
6246 	free_colors(&s->colors);
6247 	return err;
6248 }
6249 
6250 static const struct got_error *
6251 search_start_blame_view(struct tog_view *view)
6252 {
6253 	struct tog_blame_view_state *s = &view->state.blame;
6254 
6255 	s->matched_line = 0;
6256 	return NULL;
6257 }
6258 
6259 static void
6260 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6261     size_t *nlines, int **first, int **last, int **match, int **selected)
6262 {
6263 	struct tog_blame_view_state *s = &view->state.blame;
6264 
6265 	*f = s->blame.f;
6266 	*nlines = s->blame.nlines;
6267 	*line_offsets = s->blame.line_offsets;
6268 	*match = &s->matched_line;
6269 	*first = &s->first_displayed_line;
6270 	*last = &s->last_displayed_line;
6271 	*selected = &s->selected_line;
6272 }
6273 
6274 static const struct got_error *
6275 show_blame_view(struct tog_view *view)
6276 {
6277 	const struct got_error *err = NULL;
6278 	struct tog_blame_view_state *s = &view->state.blame;
6279 	int errcode;
6280 
6281 	if (s->blame.thread == NULL && !s->blame_complete) {
6282 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6283 		    &s->blame.thread_args);
6284 		if (errcode)
6285 			return got_error_set_errno(errcode, "pthread_create");
6286 
6287 		halfdelay(1); /* fast refresh while annotating  */
6288 	}
6289 
6290 	if (s->blame_complete)
6291 		halfdelay(10); /* disable fast refresh */
6292 
6293 	err = draw_blame(view);
6294 
6295 	view_border(view);
6296 	return err;
6297 }
6298 
6299 static const struct got_error *
6300 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6301     struct got_repository *repo, struct got_object_id *id)
6302 {
6303 	struct tog_view		*log_view;
6304 	const struct got_error	*err = NULL;
6305 
6306 	*new_view = NULL;
6307 
6308 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6309 	if (log_view == NULL)
6310 		return got_error_from_errno("view_open");
6311 
6312 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6313 	if (err)
6314 		view_close(log_view);
6315 	else
6316 		*new_view = log_view;
6317 
6318 	return err;
6319 }
6320 
6321 static const struct got_error *
6322 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6323 {
6324 	const struct got_error *err = NULL, *thread_err = NULL;
6325 	struct tog_view *diff_view;
6326 	struct tog_blame_view_state *s = &view->state.blame;
6327 	int eos, nscroll, begin_y = 0, begin_x = 0;
6328 
6329 	eos = nscroll = view->nlines - 2;
6330 	if (view_is_hsplit_top(view))
6331 		--eos;  /* border */
6332 
6333 	switch (ch) {
6334 	case '0':
6335 	case '$':
6336 	case KEY_RIGHT:
6337 	case 'l':
6338 	case KEY_LEFT:
6339 	case 'h':
6340 		horizontal_scroll_input(view, ch);
6341 		break;
6342 	case 'q':
6343 		s->done = 1;
6344 		break;
6345 	case 'g':
6346 	case KEY_HOME:
6347 		s->selected_line = 1;
6348 		s->first_displayed_line = 1;
6349 		view->count = 0;
6350 		break;
6351 	case 'G':
6352 	case KEY_END:
6353 		if (s->blame.nlines < eos) {
6354 			s->selected_line = s->blame.nlines;
6355 			s->first_displayed_line = 1;
6356 		} else {
6357 			s->selected_line = eos;
6358 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6359 		}
6360 		view->count = 0;
6361 		break;
6362 	case 'k':
6363 	case KEY_UP:
6364 	case CTRL('p'):
6365 		if (s->selected_line > 1)
6366 			s->selected_line--;
6367 		else if (s->selected_line == 1 &&
6368 		    s->first_displayed_line > 1)
6369 			s->first_displayed_line--;
6370 		else
6371 			view->count = 0;
6372 		break;
6373 	case CTRL('u'):
6374 	case 'u':
6375 		nscroll /= 2;
6376 		/* FALL THROUGH */
6377 	case KEY_PPAGE:
6378 	case CTRL('b'):
6379 	case 'b':
6380 		if (s->first_displayed_line == 1) {
6381 			if (view->count > 1)
6382 				nscroll += nscroll;
6383 			s->selected_line = MAX(1, s->selected_line - nscroll);
6384 			view->count = 0;
6385 			break;
6386 		}
6387 		if (s->first_displayed_line > nscroll)
6388 			s->first_displayed_line -= nscroll;
6389 		else
6390 			s->first_displayed_line = 1;
6391 		break;
6392 	case 'j':
6393 	case KEY_DOWN:
6394 	case CTRL('n'):
6395 		if (s->selected_line < eos && s->first_displayed_line +
6396 		    s->selected_line <= s->blame.nlines)
6397 			s->selected_line++;
6398 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6399 			s->first_displayed_line++;
6400 		else
6401 			view->count = 0;
6402 		break;
6403 	case 'c':
6404 	case 'p': {
6405 		struct got_object_id *id = NULL;
6406 
6407 		view->count = 0;
6408 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6409 		    s->first_displayed_line, s->selected_line);
6410 		if (id == NULL)
6411 			break;
6412 		if (ch == 'p') {
6413 			struct got_commit_object *commit, *pcommit;
6414 			struct got_object_qid *pid;
6415 			struct got_object_id *blob_id = NULL;
6416 			int obj_type;
6417 			err = got_object_open_as_commit(&commit,
6418 			    s->repo, id);
6419 			if (err)
6420 				break;
6421 			pid = STAILQ_FIRST(
6422 			    got_object_commit_get_parent_ids(commit));
6423 			if (pid == NULL) {
6424 				got_object_commit_close(commit);
6425 				break;
6426 			}
6427 			/* Check if path history ends here. */
6428 			err = got_object_open_as_commit(&pcommit,
6429 			    s->repo, &pid->id);
6430 			if (err)
6431 				break;
6432 			err = got_object_id_by_path(&blob_id, s->repo,
6433 			    pcommit, s->path);
6434 			got_object_commit_close(pcommit);
6435 			if (err) {
6436 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6437 					err = NULL;
6438 				got_object_commit_close(commit);
6439 				break;
6440 			}
6441 			err = got_object_get_type(&obj_type, s->repo,
6442 			    blob_id);
6443 			free(blob_id);
6444 			/* Can't blame non-blob type objects. */
6445 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6446 				got_object_commit_close(commit);
6447 				break;
6448 			}
6449 			err = got_object_qid_alloc(&s->blamed_commit,
6450 			    &pid->id);
6451 			got_object_commit_close(commit);
6452 		} else {
6453 			if (got_object_id_cmp(id,
6454 			    &s->blamed_commit->id) == 0)
6455 				break;
6456 			err = got_object_qid_alloc(&s->blamed_commit,
6457 			    id);
6458 		}
6459 		if (err)
6460 			break;
6461 		s->done = 1;
6462 		thread_err = stop_blame(&s->blame);
6463 		s->done = 0;
6464 		if (thread_err)
6465 			break;
6466 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6467 		    s->blamed_commit, entry);
6468 		err = run_blame(view);
6469 		if (err)
6470 			break;
6471 		break;
6472 	}
6473 	case 'C': {
6474 		struct got_object_qid *first;
6475 
6476 		view->count = 0;
6477 		first = STAILQ_FIRST(&s->blamed_commits);
6478 		if (!got_object_id_cmp(&first->id, s->commit_id))
6479 			break;
6480 		s->done = 1;
6481 		thread_err = stop_blame(&s->blame);
6482 		s->done = 0;
6483 		if (thread_err)
6484 			break;
6485 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6486 		got_object_qid_free(s->blamed_commit);
6487 		s->blamed_commit =
6488 		    STAILQ_FIRST(&s->blamed_commits);
6489 		err = run_blame(view);
6490 		if (err)
6491 			break;
6492 		break;
6493 	}
6494 	case 'L':
6495 		view->count = 0;
6496 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6497 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6498 		if (s->id_to_log)
6499 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6500 		break;
6501 	case KEY_ENTER:
6502 	case '\r': {
6503 		struct got_object_id *id = NULL;
6504 		struct got_object_qid *pid;
6505 		struct got_commit_object *commit = NULL;
6506 
6507 		view->count = 0;
6508 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6509 		    s->first_displayed_line, s->selected_line);
6510 		if (id == NULL)
6511 			break;
6512 		err = got_object_open_as_commit(&commit, s->repo, id);
6513 		if (err)
6514 			break;
6515 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6516 		if (*new_view) {
6517 			/* traversed from diff view, release diff resources  */
6518 			err = close_diff_view(*new_view);
6519 			if (err)
6520 				break;
6521 			diff_view = *new_view;
6522 		} else {
6523 			if (view_is_parent_view(view))
6524 				view_get_split(view, &begin_y, &begin_x);
6525 
6526 			diff_view = view_open(0, 0, begin_y, begin_x,
6527 			    TOG_VIEW_DIFF);
6528 			if (diff_view == NULL) {
6529 				got_object_commit_close(commit);
6530 				err = got_error_from_errno("view_open");
6531 				break;
6532 			}
6533 		}
6534 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6535 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6536 		got_object_commit_close(commit);
6537 		if (err) {
6538 			view_close(diff_view);
6539 			break;
6540 		}
6541 		s->last_diffed_line = s->first_displayed_line - 1 +
6542 		    s->selected_line;
6543 		if (*new_view)
6544 			break;	/* still open from active diff view */
6545 		if (view_is_parent_view(view) &&
6546 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6547 			err = view_init_hsplit(view, begin_y);
6548 			if (err)
6549 				break;
6550 		}
6551 
6552 		view->focussed = 0;
6553 		diff_view->focussed = 1;
6554 		diff_view->mode = view->mode;
6555 		diff_view->nlines = view->lines - begin_y;
6556 		if (view_is_parent_view(view)) {
6557 			view_transfer_size(diff_view, view);
6558 			err = view_close_child(view);
6559 			if (err)
6560 				break;
6561 			err = view_set_child(view, diff_view);
6562 			if (err)
6563 				break;
6564 			view->focus_child = 1;
6565 		} else
6566 			*new_view = diff_view;
6567 		if (err)
6568 			break;
6569 		break;
6570 	}
6571 	case CTRL('d'):
6572 	case 'd':
6573 		nscroll /= 2;
6574 		/* FALL THROUGH */
6575 	case KEY_NPAGE:
6576 	case CTRL('f'):
6577 	case 'f':
6578 	case ' ':
6579 		if (s->last_displayed_line >= s->blame.nlines &&
6580 		    s->selected_line >= MIN(s->blame.nlines,
6581 		    view->nlines - 2)) {
6582 			view->count = 0;
6583 			break;
6584 		}
6585 		if (s->last_displayed_line >= s->blame.nlines &&
6586 		    s->selected_line < view->nlines - 2) {
6587 			s->selected_line +=
6588 			    MIN(nscroll, s->last_displayed_line -
6589 			    s->first_displayed_line - s->selected_line + 1);
6590 		}
6591 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6592 			s->first_displayed_line += nscroll;
6593 		else
6594 			s->first_displayed_line =
6595 			    s->blame.nlines - (view->nlines - 3);
6596 		break;
6597 	case KEY_RESIZE:
6598 		if (s->selected_line > view->nlines - 2) {
6599 			s->selected_line = MIN(s->blame.nlines,
6600 			    view->nlines - 2);
6601 		}
6602 		break;
6603 	default:
6604 		view->count = 0;
6605 		break;
6606 	}
6607 	return thread_err ? thread_err : err;
6608 }
6609 
6610 static const struct got_error *
6611 reset_blame_view(struct tog_view *view)
6612 {
6613 	const struct got_error *err;
6614 	struct tog_blame_view_state *s = &view->state.blame;
6615 
6616 	view->count = 0;
6617 	s->done = 1;
6618 	err = stop_blame(&s->blame);
6619 	s->done = 0;
6620 	if (err)
6621 		return err;
6622 	return run_blame(view);
6623 }
6624 
6625 static const struct got_error *
6626 cmd_blame(int argc, char *argv[])
6627 {
6628 	const struct got_error *error;
6629 	struct got_repository *repo = NULL;
6630 	struct got_worktree *worktree = NULL;
6631 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6632 	char *link_target = NULL;
6633 	struct got_object_id *commit_id = NULL;
6634 	struct got_commit_object *commit = NULL;
6635 	char *commit_id_str = NULL;
6636 	int ch;
6637 	struct tog_view *view;
6638 	int *pack_fds = NULL;
6639 
6640 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6641 		switch (ch) {
6642 		case 'c':
6643 			commit_id_str = optarg;
6644 			break;
6645 		case 'r':
6646 			repo_path = realpath(optarg, NULL);
6647 			if (repo_path == NULL)
6648 				return got_error_from_errno2("realpath",
6649 				    optarg);
6650 			break;
6651 		default:
6652 			usage_blame();
6653 			/* NOTREACHED */
6654 		}
6655 	}
6656 
6657 	argc -= optind;
6658 	argv += optind;
6659 
6660 	if (argc != 1)
6661 		usage_blame();
6662 
6663 	error = got_repo_pack_fds_open(&pack_fds);
6664 	if (error != NULL)
6665 		goto done;
6666 
6667 	if (repo_path == NULL) {
6668 		cwd = getcwd(NULL, 0);
6669 		if (cwd == NULL)
6670 			return got_error_from_errno("getcwd");
6671 		error = got_worktree_open(&worktree, cwd);
6672 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6673 			goto done;
6674 		if (worktree)
6675 			repo_path =
6676 			    strdup(got_worktree_get_repo_path(worktree));
6677 		else
6678 			repo_path = strdup(cwd);
6679 		if (repo_path == NULL) {
6680 			error = got_error_from_errno("strdup");
6681 			goto done;
6682 		}
6683 	}
6684 
6685 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6686 	if (error != NULL)
6687 		goto done;
6688 
6689 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6690 	    worktree);
6691 	if (error)
6692 		goto done;
6693 
6694 	init_curses();
6695 
6696 	error = apply_unveil(got_repo_get_path(repo), NULL);
6697 	if (error)
6698 		goto done;
6699 
6700 	error = tog_load_refs(repo, 0);
6701 	if (error)
6702 		goto done;
6703 
6704 	if (commit_id_str == NULL) {
6705 		struct got_reference *head_ref;
6706 		error = got_ref_open(&head_ref, repo, worktree ?
6707 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6708 		if (error != NULL)
6709 			goto done;
6710 		error = got_ref_resolve(&commit_id, repo, head_ref);
6711 		got_ref_close(head_ref);
6712 	} else {
6713 		error = got_repo_match_object_id(&commit_id, NULL,
6714 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6715 	}
6716 	if (error != NULL)
6717 		goto done;
6718 
6719 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6720 	if (view == NULL) {
6721 		error = got_error_from_errno("view_open");
6722 		goto done;
6723 	}
6724 
6725 	error = got_object_open_as_commit(&commit, repo, commit_id);
6726 	if (error)
6727 		goto done;
6728 
6729 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6730 	    commit, repo);
6731 	if (error)
6732 		goto done;
6733 
6734 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6735 	    commit_id, repo);
6736 	if (error)
6737 		goto done;
6738 	if (worktree) {
6739 		/* Release work tree lock. */
6740 		got_worktree_close(worktree);
6741 		worktree = NULL;
6742 	}
6743 	error = view_loop(view);
6744 done:
6745 	free(repo_path);
6746 	free(in_repo_path);
6747 	free(link_target);
6748 	free(cwd);
6749 	free(commit_id);
6750 	if (commit)
6751 		got_object_commit_close(commit);
6752 	if (worktree)
6753 		got_worktree_close(worktree);
6754 	if (repo) {
6755 		const struct got_error *close_err = got_repo_close(repo);
6756 		if (error == NULL)
6757 			error = close_err;
6758 	}
6759 	if (pack_fds) {
6760 		const struct got_error *pack_err =
6761 		    got_repo_pack_fds_close(pack_fds);
6762 		if (error == NULL)
6763 			error = pack_err;
6764 	}
6765 	tog_free_refs();
6766 	return error;
6767 }
6768 
6769 static const struct got_error *
6770 draw_tree_entries(struct tog_view *view, const char *parent_path)
6771 {
6772 	struct tog_tree_view_state *s = &view->state.tree;
6773 	const struct got_error *err = NULL;
6774 	struct got_tree_entry *te;
6775 	wchar_t *wline;
6776 	char *index = NULL;
6777 	struct tog_color *tc;
6778 	int width, n, nentries, scrollx, i = 1;
6779 	int limit = view->nlines;
6780 
6781 	s->ndisplayed = 0;
6782 	if (view_is_hsplit_top(view))
6783 		--limit;  /* border */
6784 
6785 	werase(view->window);
6786 
6787 	if (limit == 0)
6788 		return NULL;
6789 
6790 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6791 	    0, 0);
6792 	if (err)
6793 		return err;
6794 	if (view_needs_focus_indication(view))
6795 		wstandout(view->window);
6796 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6797 	if (tc)
6798 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6799 	waddwstr(view->window, wline);
6800 	free(wline);
6801 	wline = NULL;
6802 	while (width++ < view->ncols)
6803 		waddch(view->window, ' ');
6804 	if (tc)
6805 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6806 	if (view_needs_focus_indication(view))
6807 		wstandend(view->window);
6808 	if (--limit <= 0)
6809 		return NULL;
6810 
6811 	i += s->selected;
6812 	if (s->first_displayed_entry) {
6813 		i += got_tree_entry_get_index(s->first_displayed_entry);
6814 		if (s->tree != s->root)
6815 			++i;  /* account for ".." entry */
6816 	}
6817 	nentries = got_object_tree_get_nentries(s->tree);
6818 	if (asprintf(&index, "[%d/%d] %s",
6819 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6820 		return got_error_from_errno("asprintf");
6821 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6822 	free(index);
6823 	if (err)
6824 		return err;
6825 	waddwstr(view->window, wline);
6826 	free(wline);
6827 	wline = NULL;
6828 	if (width < view->ncols - 1)
6829 		waddch(view->window, '\n');
6830 	if (--limit <= 0)
6831 		return NULL;
6832 	waddch(view->window, '\n');
6833 	if (--limit <= 0)
6834 		return NULL;
6835 
6836 	if (s->first_displayed_entry == NULL) {
6837 		te = got_object_tree_get_first_entry(s->tree);
6838 		if (s->selected == 0) {
6839 			if (view->focussed)
6840 				wstandout(view->window);
6841 			s->selected_entry = NULL;
6842 		}
6843 		waddstr(view->window, "  ..\n");	/* parent directory */
6844 		if (s->selected == 0 && view->focussed)
6845 			wstandend(view->window);
6846 		s->ndisplayed++;
6847 		if (--limit <= 0)
6848 			return NULL;
6849 		n = 1;
6850 	} else {
6851 		n = 0;
6852 		te = s->first_displayed_entry;
6853 	}
6854 
6855 	view->maxx = 0;
6856 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6857 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6858 		const char *modestr = "";
6859 		mode_t mode;
6860 
6861 		te = got_object_tree_get_entry(s->tree, i);
6862 		mode = got_tree_entry_get_mode(te);
6863 
6864 		if (s->show_ids) {
6865 			err = got_object_id_str(&id_str,
6866 			    got_tree_entry_get_id(te));
6867 			if (err)
6868 				return got_error_from_errno(
6869 				    "got_object_id_str");
6870 		}
6871 		if (got_object_tree_entry_is_submodule(te))
6872 			modestr = "$";
6873 		else if (S_ISLNK(mode)) {
6874 			int i;
6875 
6876 			err = got_tree_entry_get_symlink_target(&link_target,
6877 			    te, s->repo);
6878 			if (err) {
6879 				free(id_str);
6880 				return err;
6881 			}
6882 			for (i = 0; i < strlen(link_target); i++) {
6883 				if (!isprint((unsigned char)link_target[i]))
6884 					link_target[i] = '?';
6885 			}
6886 			modestr = "@";
6887 		}
6888 		else if (S_ISDIR(mode))
6889 			modestr = "/";
6890 		else if (mode & S_IXUSR)
6891 			modestr = "*";
6892 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6893 		    got_tree_entry_get_name(te), modestr,
6894 		    link_target ? " -> ": "",
6895 		    link_target ? link_target : "") == -1) {
6896 			free(id_str);
6897 			free(link_target);
6898 			return got_error_from_errno("asprintf");
6899 		}
6900 		free(id_str);
6901 		free(link_target);
6902 
6903 		/* use full line width to determine view->maxx */
6904 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
6905 		if (err) {
6906 			free(line);
6907 			break;
6908 		}
6909 		view->maxx = MAX(view->maxx, width);
6910 		free(wline);
6911 		wline = NULL;
6912 
6913 		err = format_line(&wline, &width, &scrollx, line, view->x,
6914 		    view->ncols, 0, 0);
6915 		if (err) {
6916 			free(line);
6917 			break;
6918 		}
6919 		if (n == s->selected) {
6920 			if (view->focussed)
6921 				wstandout(view->window);
6922 			s->selected_entry = te;
6923 		}
6924 		tc = match_color(&s->colors, line);
6925 		if (tc)
6926 			wattr_on(view->window,
6927 			    COLOR_PAIR(tc->colorpair), NULL);
6928 		waddwstr(view->window, &wline[scrollx]);
6929 		if (tc)
6930 			wattr_off(view->window,
6931 			    COLOR_PAIR(tc->colorpair), NULL);
6932 		if (width < view->ncols)
6933 			waddch(view->window, '\n');
6934 		if (n == s->selected && view->focussed)
6935 			wstandend(view->window);
6936 		free(line);
6937 		free(wline);
6938 		wline = NULL;
6939 		n++;
6940 		s->ndisplayed++;
6941 		s->last_displayed_entry = te;
6942 		if (--limit <= 0)
6943 			break;
6944 	}
6945 
6946 	return err;
6947 }
6948 
6949 static void
6950 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6951 {
6952 	struct got_tree_entry *te;
6953 	int isroot = s->tree == s->root;
6954 	int i = 0;
6955 
6956 	if (s->first_displayed_entry == NULL)
6957 		return;
6958 
6959 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6960 	while (i++ < maxscroll) {
6961 		if (te == NULL) {
6962 			if (!isroot)
6963 				s->first_displayed_entry = NULL;
6964 			break;
6965 		}
6966 		s->first_displayed_entry = te;
6967 		te = got_tree_entry_get_prev(s->tree, te);
6968 	}
6969 }
6970 
6971 static const struct got_error *
6972 tree_scroll_down(struct tog_view *view, int maxscroll)
6973 {
6974 	struct tog_tree_view_state *s = &view->state.tree;
6975 	struct got_tree_entry *next, *last;
6976 	int n = 0;
6977 
6978 	if (s->first_displayed_entry)
6979 		next = got_tree_entry_get_next(s->tree,
6980 		    s->first_displayed_entry);
6981 	else
6982 		next = got_object_tree_get_first_entry(s->tree);
6983 
6984 	last = s->last_displayed_entry;
6985 	while (next && n++ < maxscroll) {
6986 		if (last) {
6987 			s->last_displayed_entry = last;
6988 			last = got_tree_entry_get_next(s->tree, last);
6989 		}
6990 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6991 			s->first_displayed_entry = next;
6992 			next = got_tree_entry_get_next(s->tree, next);
6993 		}
6994 	}
6995 
6996 	return NULL;
6997 }
6998 
6999 static const struct got_error *
7000 tree_entry_path(char **path, struct tog_parent_trees *parents,
7001     struct got_tree_entry *te)
7002 {
7003 	const struct got_error *err = NULL;
7004 	struct tog_parent_tree *pt;
7005 	size_t len = 2; /* for leading slash and NUL */
7006 
7007 	TAILQ_FOREACH(pt, parents, entry)
7008 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7009 		    + 1 /* slash */;
7010 	if (te)
7011 		len += strlen(got_tree_entry_get_name(te));
7012 
7013 	*path = calloc(1, len);
7014 	if (path == NULL)
7015 		return got_error_from_errno("calloc");
7016 
7017 	(*path)[0] = '/';
7018 	pt = TAILQ_LAST(parents, tog_parent_trees);
7019 	while (pt) {
7020 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7021 		if (strlcat(*path, name, len) >= len) {
7022 			err = got_error(GOT_ERR_NO_SPACE);
7023 			goto done;
7024 		}
7025 		if (strlcat(*path, "/", len) >= len) {
7026 			err = got_error(GOT_ERR_NO_SPACE);
7027 			goto done;
7028 		}
7029 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7030 	}
7031 	if (te) {
7032 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7033 			err = got_error(GOT_ERR_NO_SPACE);
7034 			goto done;
7035 		}
7036 	}
7037 done:
7038 	if (err) {
7039 		free(*path);
7040 		*path = NULL;
7041 	}
7042 	return err;
7043 }
7044 
7045 static const struct got_error *
7046 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7047     struct got_tree_entry *te, struct tog_parent_trees *parents,
7048     struct got_object_id *commit_id, struct got_repository *repo)
7049 {
7050 	const struct got_error *err = NULL;
7051 	char *path;
7052 	struct tog_view *blame_view;
7053 
7054 	*new_view = NULL;
7055 
7056 	err = tree_entry_path(&path, parents, te);
7057 	if (err)
7058 		return err;
7059 
7060 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7061 	if (blame_view == NULL) {
7062 		err = got_error_from_errno("view_open");
7063 		goto done;
7064 	}
7065 
7066 	err = open_blame_view(blame_view, path, commit_id, repo);
7067 	if (err) {
7068 		if (err->code == GOT_ERR_CANCELLED)
7069 			err = NULL;
7070 		view_close(blame_view);
7071 	} else
7072 		*new_view = blame_view;
7073 done:
7074 	free(path);
7075 	return err;
7076 }
7077 
7078 static const struct got_error *
7079 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7080     struct tog_tree_view_state *s)
7081 {
7082 	struct tog_view *log_view;
7083 	const struct got_error *err = NULL;
7084 	char *path;
7085 
7086 	*new_view = NULL;
7087 
7088 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7089 	if (log_view == NULL)
7090 		return got_error_from_errno("view_open");
7091 
7092 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7093 	if (err)
7094 		return err;
7095 
7096 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7097 	    path, 0);
7098 	if (err)
7099 		view_close(log_view);
7100 	else
7101 		*new_view = log_view;
7102 	free(path);
7103 	return err;
7104 }
7105 
7106 static const struct got_error *
7107 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7108     const char *head_ref_name, struct got_repository *repo)
7109 {
7110 	const struct got_error *err = NULL;
7111 	char *commit_id_str = NULL;
7112 	struct tog_tree_view_state *s = &view->state.tree;
7113 	struct got_commit_object *commit = NULL;
7114 
7115 	TAILQ_INIT(&s->parents);
7116 	STAILQ_INIT(&s->colors);
7117 
7118 	s->commit_id = got_object_id_dup(commit_id);
7119 	if (s->commit_id == NULL)
7120 		return got_error_from_errno("got_object_id_dup");
7121 
7122 	err = got_object_open_as_commit(&commit, repo, commit_id);
7123 	if (err)
7124 		goto done;
7125 
7126 	/*
7127 	 * The root is opened here and will be closed when the view is closed.
7128 	 * Any visited subtrees and their path-wise parents are opened and
7129 	 * closed on demand.
7130 	 */
7131 	err = got_object_open_as_tree(&s->root, repo,
7132 	    got_object_commit_get_tree_id(commit));
7133 	if (err)
7134 		goto done;
7135 	s->tree = s->root;
7136 
7137 	err = got_object_id_str(&commit_id_str, commit_id);
7138 	if (err != NULL)
7139 		goto done;
7140 
7141 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7142 		err = got_error_from_errno("asprintf");
7143 		goto done;
7144 	}
7145 
7146 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7147 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7148 	if (head_ref_name) {
7149 		s->head_ref_name = strdup(head_ref_name);
7150 		if (s->head_ref_name == NULL) {
7151 			err = got_error_from_errno("strdup");
7152 			goto done;
7153 		}
7154 	}
7155 	s->repo = repo;
7156 
7157 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7158 		err = add_color(&s->colors, "\\$$",
7159 		    TOG_COLOR_TREE_SUBMODULE,
7160 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7161 		if (err)
7162 			goto done;
7163 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7164 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7165 		if (err)
7166 			goto done;
7167 		err = add_color(&s->colors, "/$",
7168 		    TOG_COLOR_TREE_DIRECTORY,
7169 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7170 		if (err)
7171 			goto done;
7172 
7173 		err = add_color(&s->colors, "\\*$",
7174 		    TOG_COLOR_TREE_EXECUTABLE,
7175 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7176 		if (err)
7177 			goto done;
7178 
7179 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7180 		    get_color_value("TOG_COLOR_COMMIT"));
7181 		if (err)
7182 			goto done;
7183 	}
7184 
7185 	view->show = show_tree_view;
7186 	view->input = input_tree_view;
7187 	view->close = close_tree_view;
7188 	view->search_start = search_start_tree_view;
7189 	view->search_next = search_next_tree_view;
7190 done:
7191 	free(commit_id_str);
7192 	if (commit)
7193 		got_object_commit_close(commit);
7194 	if (err)
7195 		close_tree_view(view);
7196 	return err;
7197 }
7198 
7199 static const struct got_error *
7200 close_tree_view(struct tog_view *view)
7201 {
7202 	struct tog_tree_view_state *s = &view->state.tree;
7203 
7204 	free_colors(&s->colors);
7205 	free(s->tree_label);
7206 	s->tree_label = NULL;
7207 	free(s->commit_id);
7208 	s->commit_id = NULL;
7209 	free(s->head_ref_name);
7210 	s->head_ref_name = NULL;
7211 	while (!TAILQ_EMPTY(&s->parents)) {
7212 		struct tog_parent_tree *parent;
7213 		parent = TAILQ_FIRST(&s->parents);
7214 		TAILQ_REMOVE(&s->parents, parent, entry);
7215 		if (parent->tree != s->root)
7216 			got_object_tree_close(parent->tree);
7217 		free(parent);
7218 
7219 	}
7220 	if (s->tree != NULL && s->tree != s->root)
7221 		got_object_tree_close(s->tree);
7222 	if (s->root)
7223 		got_object_tree_close(s->root);
7224 	return NULL;
7225 }
7226 
7227 static const struct got_error *
7228 search_start_tree_view(struct tog_view *view)
7229 {
7230 	struct tog_tree_view_state *s = &view->state.tree;
7231 
7232 	s->matched_entry = NULL;
7233 	return NULL;
7234 }
7235 
7236 static int
7237 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7238 {
7239 	regmatch_t regmatch;
7240 
7241 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7242 	    0) == 0;
7243 }
7244 
7245 static const struct got_error *
7246 search_next_tree_view(struct tog_view *view)
7247 {
7248 	struct tog_tree_view_state *s = &view->state.tree;
7249 	struct got_tree_entry *te = NULL;
7250 
7251 	if (!view->searching) {
7252 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7253 		return NULL;
7254 	}
7255 
7256 	if (s->matched_entry) {
7257 		if (view->searching == TOG_SEARCH_FORWARD) {
7258 			if (s->selected_entry)
7259 				te = got_tree_entry_get_next(s->tree,
7260 				    s->selected_entry);
7261 			else
7262 				te = got_object_tree_get_first_entry(s->tree);
7263 		} else {
7264 			if (s->selected_entry == NULL)
7265 				te = got_object_tree_get_last_entry(s->tree);
7266 			else
7267 				te = got_tree_entry_get_prev(s->tree,
7268 				    s->selected_entry);
7269 		}
7270 	} else {
7271 		if (s->selected_entry)
7272 			te = s->selected_entry;
7273 		else if (view->searching == TOG_SEARCH_FORWARD)
7274 			te = got_object_tree_get_first_entry(s->tree);
7275 		else
7276 			te = got_object_tree_get_last_entry(s->tree);
7277 	}
7278 
7279 	while (1) {
7280 		if (te == NULL) {
7281 			if (s->matched_entry == NULL) {
7282 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7283 				return NULL;
7284 			}
7285 			if (view->searching == TOG_SEARCH_FORWARD)
7286 				te = got_object_tree_get_first_entry(s->tree);
7287 			else
7288 				te = got_object_tree_get_last_entry(s->tree);
7289 		}
7290 
7291 		if (match_tree_entry(te, &view->regex)) {
7292 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7293 			s->matched_entry = te;
7294 			break;
7295 		}
7296 
7297 		if (view->searching == TOG_SEARCH_FORWARD)
7298 			te = got_tree_entry_get_next(s->tree, te);
7299 		else
7300 			te = got_tree_entry_get_prev(s->tree, te);
7301 	}
7302 
7303 	if (s->matched_entry) {
7304 		s->first_displayed_entry = s->matched_entry;
7305 		s->selected = 0;
7306 	}
7307 
7308 	return NULL;
7309 }
7310 
7311 static const struct got_error *
7312 show_tree_view(struct tog_view *view)
7313 {
7314 	const struct got_error *err = NULL;
7315 	struct tog_tree_view_state *s = &view->state.tree;
7316 	char *parent_path;
7317 
7318 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7319 	if (err)
7320 		return err;
7321 
7322 	err = draw_tree_entries(view, parent_path);
7323 	free(parent_path);
7324 
7325 	view_border(view);
7326 	return err;
7327 }
7328 
7329 static const struct got_error *
7330 tree_goto_line(struct tog_view *view, int nlines)
7331 {
7332 	const struct got_error		 *err = NULL;
7333 	struct tog_tree_view_state	 *s = &view->state.tree;
7334 	struct got_tree_entry		**fte, **lte, **ste;
7335 	int				  g, last, first = 1, i = 1;
7336 	int				  root = s->tree == s->root;
7337 	int				  off = root ? 1 : 2;
7338 
7339 	g = view->gline;
7340 	view->gline = 0;
7341 
7342 	if (g == 0)
7343 		g = 1;
7344 	else if (g > got_object_tree_get_nentries(s->tree))
7345 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7346 
7347 	fte = &s->first_displayed_entry;
7348 	lte = &s->last_displayed_entry;
7349 	ste = &s->selected_entry;
7350 
7351 	if (*fte != NULL) {
7352 		first = got_tree_entry_get_index(*fte);
7353 		first += off;  /* account for ".." */
7354 	}
7355 	last = got_tree_entry_get_index(*lte);
7356 	last += off;
7357 
7358 	if (g >= first && g <= last && g - first < nlines) {
7359 		s->selected = g - first;
7360 		return NULL;	/* gline is on the current page */
7361 	}
7362 
7363 	if (*ste != NULL) {
7364 		i = got_tree_entry_get_index(*ste);
7365 		i += off;
7366 	}
7367 
7368 	if (i < g) {
7369 		err = tree_scroll_down(view, g - i);
7370 		if (err)
7371 			return err;
7372 		if (got_tree_entry_get_index(*lte) >=
7373 		    got_object_tree_get_nentries(s->tree) - 1 &&
7374 		    first + s->selected < g &&
7375 		    s->selected < s->ndisplayed - 1) {
7376 			first = got_tree_entry_get_index(*fte);
7377 			first += off;
7378 			s->selected = g - first;
7379 		}
7380 	} else if (i > g)
7381 		tree_scroll_up(s, i - g);
7382 
7383 	if (g < nlines &&
7384 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7385 		s->selected = g - 1;
7386 
7387 	return NULL;
7388 }
7389 
7390 static const struct got_error *
7391 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7392 {
7393 	const struct got_error *err = NULL;
7394 	struct tog_tree_view_state *s = &view->state.tree;
7395 	struct got_tree_entry *te;
7396 	int n, nscroll = view->nlines - 3;
7397 
7398 	if (view->gline)
7399 		return tree_goto_line(view, nscroll);
7400 
7401 	switch (ch) {
7402 	case '0':
7403 	case '$':
7404 	case KEY_RIGHT:
7405 	case 'l':
7406 	case KEY_LEFT:
7407 	case 'h':
7408 		horizontal_scroll_input(view, ch);
7409 		break;
7410 	case 'i':
7411 		s->show_ids = !s->show_ids;
7412 		view->count = 0;
7413 		break;
7414 	case 'L':
7415 		view->count = 0;
7416 		if (!s->selected_entry)
7417 			break;
7418 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7419 		break;
7420 	case 'R':
7421 		view->count = 0;
7422 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7423 		break;
7424 	case 'g':
7425 	case '=':
7426 	case KEY_HOME:
7427 		s->selected = 0;
7428 		view->count = 0;
7429 		if (s->tree == s->root)
7430 			s->first_displayed_entry =
7431 			    got_object_tree_get_first_entry(s->tree);
7432 		else
7433 			s->first_displayed_entry = NULL;
7434 		break;
7435 	case 'G':
7436 	case '*':
7437 	case KEY_END: {
7438 		int eos = view->nlines - 3;
7439 
7440 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7441 			--eos;  /* border */
7442 		s->selected = 0;
7443 		view->count = 0;
7444 		te = got_object_tree_get_last_entry(s->tree);
7445 		for (n = 0; n < eos; n++) {
7446 			if (te == NULL) {
7447 				if (s->tree != s->root) {
7448 					s->first_displayed_entry = NULL;
7449 					n++;
7450 				}
7451 				break;
7452 			}
7453 			s->first_displayed_entry = te;
7454 			te = got_tree_entry_get_prev(s->tree, te);
7455 		}
7456 		if (n > 0)
7457 			s->selected = n - 1;
7458 		break;
7459 	}
7460 	case 'k':
7461 	case KEY_UP:
7462 	case CTRL('p'):
7463 		if (s->selected > 0) {
7464 			s->selected--;
7465 			break;
7466 		}
7467 		tree_scroll_up(s, 1);
7468 		if (s->selected_entry == NULL ||
7469 		    (s->tree == s->root && s->selected_entry ==
7470 		     got_object_tree_get_first_entry(s->tree)))
7471 			view->count = 0;
7472 		break;
7473 	case CTRL('u'):
7474 	case 'u':
7475 		nscroll /= 2;
7476 		/* FALL THROUGH */
7477 	case KEY_PPAGE:
7478 	case CTRL('b'):
7479 	case 'b':
7480 		if (s->tree == s->root) {
7481 			if (got_object_tree_get_first_entry(s->tree) ==
7482 			    s->first_displayed_entry)
7483 				s->selected -= MIN(s->selected, nscroll);
7484 		} else {
7485 			if (s->first_displayed_entry == NULL)
7486 				s->selected -= MIN(s->selected, nscroll);
7487 		}
7488 		tree_scroll_up(s, MAX(0, nscroll));
7489 		if (s->selected_entry == NULL ||
7490 		    (s->tree == s->root && s->selected_entry ==
7491 		     got_object_tree_get_first_entry(s->tree)))
7492 			view->count = 0;
7493 		break;
7494 	case 'j':
7495 	case KEY_DOWN:
7496 	case CTRL('n'):
7497 		if (s->selected < s->ndisplayed - 1) {
7498 			s->selected++;
7499 			break;
7500 		}
7501 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7502 		    == NULL) {
7503 			/* can't scroll any further */
7504 			view->count = 0;
7505 			break;
7506 		}
7507 		tree_scroll_down(view, 1);
7508 		break;
7509 	case CTRL('d'):
7510 	case 'd':
7511 		nscroll /= 2;
7512 		/* FALL THROUGH */
7513 	case KEY_NPAGE:
7514 	case CTRL('f'):
7515 	case 'f':
7516 	case ' ':
7517 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7518 		    == NULL) {
7519 			/* can't scroll any further; move cursor down */
7520 			if (s->selected < s->ndisplayed - 1)
7521 				s->selected += MIN(nscroll,
7522 				    s->ndisplayed - s->selected - 1);
7523 			else
7524 				view->count = 0;
7525 			break;
7526 		}
7527 		tree_scroll_down(view, nscroll);
7528 		break;
7529 	case KEY_ENTER:
7530 	case '\r':
7531 	case KEY_BACKSPACE:
7532 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7533 			struct tog_parent_tree *parent;
7534 			/* user selected '..' */
7535 			if (s->tree == s->root) {
7536 				view->count = 0;
7537 				break;
7538 			}
7539 			parent = TAILQ_FIRST(&s->parents);
7540 			TAILQ_REMOVE(&s->parents, parent,
7541 			    entry);
7542 			got_object_tree_close(s->tree);
7543 			s->tree = parent->tree;
7544 			s->first_displayed_entry =
7545 			    parent->first_displayed_entry;
7546 			s->selected_entry =
7547 			    parent->selected_entry;
7548 			s->selected = parent->selected;
7549 			if (s->selected > view->nlines - 3) {
7550 				err = offset_selection_down(view);
7551 				if (err)
7552 					break;
7553 			}
7554 			free(parent);
7555 		} else if (S_ISDIR(got_tree_entry_get_mode(
7556 		    s->selected_entry))) {
7557 			struct got_tree_object *subtree;
7558 			view->count = 0;
7559 			err = got_object_open_as_tree(&subtree, s->repo,
7560 			    got_tree_entry_get_id(s->selected_entry));
7561 			if (err)
7562 				break;
7563 			err = tree_view_visit_subtree(s, subtree);
7564 			if (err) {
7565 				got_object_tree_close(subtree);
7566 				break;
7567 			}
7568 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7569 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7570 		break;
7571 	case KEY_RESIZE:
7572 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7573 			s->selected = view->nlines - 4;
7574 		view->count = 0;
7575 		break;
7576 	default:
7577 		view->count = 0;
7578 		break;
7579 	}
7580 
7581 	return err;
7582 }
7583 
7584 __dead static void
7585 usage_tree(void)
7586 {
7587 	endwin();
7588 	fprintf(stderr,
7589 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7590 	    getprogname());
7591 	exit(1);
7592 }
7593 
7594 static const struct got_error *
7595 cmd_tree(int argc, char *argv[])
7596 {
7597 	const struct got_error *error;
7598 	struct got_repository *repo = NULL;
7599 	struct got_worktree *worktree = NULL;
7600 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7601 	struct got_object_id *commit_id = NULL;
7602 	struct got_commit_object *commit = NULL;
7603 	const char *commit_id_arg = NULL;
7604 	char *label = NULL;
7605 	struct got_reference *ref = NULL;
7606 	const char *head_ref_name = NULL;
7607 	int ch;
7608 	struct tog_view *view;
7609 	int *pack_fds = NULL;
7610 
7611 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7612 		switch (ch) {
7613 		case 'c':
7614 			commit_id_arg = optarg;
7615 			break;
7616 		case 'r':
7617 			repo_path = realpath(optarg, NULL);
7618 			if (repo_path == NULL)
7619 				return got_error_from_errno2("realpath",
7620 				    optarg);
7621 			break;
7622 		default:
7623 			usage_tree();
7624 			/* NOTREACHED */
7625 		}
7626 	}
7627 
7628 	argc -= optind;
7629 	argv += optind;
7630 
7631 	if (argc > 1)
7632 		usage_tree();
7633 
7634 	error = got_repo_pack_fds_open(&pack_fds);
7635 	if (error != NULL)
7636 		goto done;
7637 
7638 	if (repo_path == NULL) {
7639 		cwd = getcwd(NULL, 0);
7640 		if (cwd == NULL)
7641 			return got_error_from_errno("getcwd");
7642 		error = got_worktree_open(&worktree, cwd);
7643 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7644 			goto done;
7645 		if (worktree)
7646 			repo_path =
7647 			    strdup(got_worktree_get_repo_path(worktree));
7648 		else
7649 			repo_path = strdup(cwd);
7650 		if (repo_path == NULL) {
7651 			error = got_error_from_errno("strdup");
7652 			goto done;
7653 		}
7654 	}
7655 
7656 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7657 	if (error != NULL)
7658 		goto done;
7659 
7660 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7661 	    repo, worktree);
7662 	if (error)
7663 		goto done;
7664 
7665 	init_curses();
7666 
7667 	error = apply_unveil(got_repo_get_path(repo), NULL);
7668 	if (error)
7669 		goto done;
7670 
7671 	error = tog_load_refs(repo, 0);
7672 	if (error)
7673 		goto done;
7674 
7675 	if (commit_id_arg == NULL) {
7676 		error = got_repo_match_object_id(&commit_id, &label,
7677 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7678 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7679 		if (error)
7680 			goto done;
7681 		head_ref_name = label;
7682 	} else {
7683 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7684 		if (error == NULL)
7685 			head_ref_name = got_ref_get_name(ref);
7686 		else if (error->code != GOT_ERR_NOT_REF)
7687 			goto done;
7688 		error = got_repo_match_object_id(&commit_id, NULL,
7689 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7690 		if (error)
7691 			goto done;
7692 	}
7693 
7694 	error = got_object_open_as_commit(&commit, repo, commit_id);
7695 	if (error)
7696 		goto done;
7697 
7698 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7699 	if (view == NULL) {
7700 		error = got_error_from_errno("view_open");
7701 		goto done;
7702 	}
7703 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7704 	if (error)
7705 		goto done;
7706 	if (!got_path_is_root_dir(in_repo_path)) {
7707 		error = tree_view_walk_path(&view->state.tree, commit,
7708 		    in_repo_path);
7709 		if (error)
7710 			goto done;
7711 	}
7712 
7713 	if (worktree) {
7714 		/* Release work tree lock. */
7715 		got_worktree_close(worktree);
7716 		worktree = NULL;
7717 	}
7718 	error = view_loop(view);
7719 done:
7720 	free(repo_path);
7721 	free(cwd);
7722 	free(commit_id);
7723 	free(label);
7724 	if (ref)
7725 		got_ref_close(ref);
7726 	if (repo) {
7727 		const struct got_error *close_err = got_repo_close(repo);
7728 		if (error == NULL)
7729 			error = close_err;
7730 	}
7731 	if (pack_fds) {
7732 		const struct got_error *pack_err =
7733 		    got_repo_pack_fds_close(pack_fds);
7734 		if (error == NULL)
7735 			error = pack_err;
7736 	}
7737 	tog_free_refs();
7738 	return error;
7739 }
7740 
7741 static const struct got_error *
7742 ref_view_load_refs(struct tog_ref_view_state *s)
7743 {
7744 	struct got_reflist_entry *sre;
7745 	struct tog_reflist_entry *re;
7746 
7747 	s->nrefs = 0;
7748 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7749 		if (strncmp(got_ref_get_name(sre->ref),
7750 		    "refs/got/", 9) == 0 &&
7751 		    strncmp(got_ref_get_name(sre->ref),
7752 		    "refs/got/backup/", 16) != 0)
7753 			continue;
7754 
7755 		re = malloc(sizeof(*re));
7756 		if (re == NULL)
7757 			return got_error_from_errno("malloc");
7758 
7759 		re->ref = got_ref_dup(sre->ref);
7760 		if (re->ref == NULL)
7761 			return got_error_from_errno("got_ref_dup");
7762 		re->idx = s->nrefs++;
7763 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7764 	}
7765 
7766 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7767 	return NULL;
7768 }
7769 
7770 static void
7771 ref_view_free_refs(struct tog_ref_view_state *s)
7772 {
7773 	struct tog_reflist_entry *re;
7774 
7775 	while (!TAILQ_EMPTY(&s->refs)) {
7776 		re = TAILQ_FIRST(&s->refs);
7777 		TAILQ_REMOVE(&s->refs, re, entry);
7778 		got_ref_close(re->ref);
7779 		free(re);
7780 	}
7781 }
7782 
7783 static const struct got_error *
7784 open_ref_view(struct tog_view *view, struct got_repository *repo)
7785 {
7786 	const struct got_error *err = NULL;
7787 	struct tog_ref_view_state *s = &view->state.ref;
7788 
7789 	s->selected_entry = 0;
7790 	s->repo = repo;
7791 
7792 	TAILQ_INIT(&s->refs);
7793 	STAILQ_INIT(&s->colors);
7794 
7795 	err = ref_view_load_refs(s);
7796 	if (err)
7797 		return err;
7798 
7799 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7800 		err = add_color(&s->colors, "^refs/heads/",
7801 		    TOG_COLOR_REFS_HEADS,
7802 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7803 		if (err)
7804 			goto done;
7805 
7806 		err = add_color(&s->colors, "^refs/tags/",
7807 		    TOG_COLOR_REFS_TAGS,
7808 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7809 		if (err)
7810 			goto done;
7811 
7812 		err = add_color(&s->colors, "^refs/remotes/",
7813 		    TOG_COLOR_REFS_REMOTES,
7814 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7815 		if (err)
7816 			goto done;
7817 
7818 		err = add_color(&s->colors, "^refs/got/backup/",
7819 		    TOG_COLOR_REFS_BACKUP,
7820 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7821 		if (err)
7822 			goto done;
7823 	}
7824 
7825 	view->show = show_ref_view;
7826 	view->input = input_ref_view;
7827 	view->close = close_ref_view;
7828 	view->search_start = search_start_ref_view;
7829 	view->search_next = search_next_ref_view;
7830 done:
7831 	if (err)
7832 		free_colors(&s->colors);
7833 	return err;
7834 }
7835 
7836 static const struct got_error *
7837 close_ref_view(struct tog_view *view)
7838 {
7839 	struct tog_ref_view_state *s = &view->state.ref;
7840 
7841 	ref_view_free_refs(s);
7842 	free_colors(&s->colors);
7843 
7844 	return NULL;
7845 }
7846 
7847 static const struct got_error *
7848 resolve_reflist_entry(struct got_object_id **commit_id,
7849     struct tog_reflist_entry *re, struct got_repository *repo)
7850 {
7851 	const struct got_error *err = NULL;
7852 	struct got_object_id *obj_id;
7853 	struct got_tag_object *tag = NULL;
7854 	int obj_type;
7855 
7856 	*commit_id = NULL;
7857 
7858 	err = got_ref_resolve(&obj_id, repo, re->ref);
7859 	if (err)
7860 		return err;
7861 
7862 	err = got_object_get_type(&obj_type, repo, obj_id);
7863 	if (err)
7864 		goto done;
7865 
7866 	switch (obj_type) {
7867 	case GOT_OBJ_TYPE_COMMIT:
7868 		*commit_id = obj_id;
7869 		break;
7870 	case GOT_OBJ_TYPE_TAG:
7871 		err = got_object_open_as_tag(&tag, repo, obj_id);
7872 		if (err)
7873 			goto done;
7874 		free(obj_id);
7875 		err = got_object_get_type(&obj_type, repo,
7876 		    got_object_tag_get_object_id(tag));
7877 		if (err)
7878 			goto done;
7879 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7880 			err = got_error(GOT_ERR_OBJ_TYPE);
7881 			goto done;
7882 		}
7883 		*commit_id = got_object_id_dup(
7884 		    got_object_tag_get_object_id(tag));
7885 		if (*commit_id == NULL) {
7886 			err = got_error_from_errno("got_object_id_dup");
7887 			goto done;
7888 		}
7889 		break;
7890 	default:
7891 		err = got_error(GOT_ERR_OBJ_TYPE);
7892 		break;
7893 	}
7894 
7895 done:
7896 	if (tag)
7897 		got_object_tag_close(tag);
7898 	if (err) {
7899 		free(*commit_id);
7900 		*commit_id = NULL;
7901 	}
7902 	return err;
7903 }
7904 
7905 static const struct got_error *
7906 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7907     struct tog_reflist_entry *re, struct got_repository *repo)
7908 {
7909 	struct tog_view *log_view;
7910 	const struct got_error *err = NULL;
7911 	struct got_object_id *commit_id = NULL;
7912 
7913 	*new_view = NULL;
7914 
7915 	err = resolve_reflist_entry(&commit_id, re, repo);
7916 	if (err) {
7917 		if (err->code != GOT_ERR_OBJ_TYPE)
7918 			return err;
7919 		else
7920 			return NULL;
7921 	}
7922 
7923 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7924 	if (log_view == NULL) {
7925 		err = got_error_from_errno("view_open");
7926 		goto done;
7927 	}
7928 
7929 	err = open_log_view(log_view, commit_id, repo,
7930 	    got_ref_get_name(re->ref), "", 0);
7931 done:
7932 	if (err)
7933 		view_close(log_view);
7934 	else
7935 		*new_view = log_view;
7936 	free(commit_id);
7937 	return err;
7938 }
7939 
7940 static void
7941 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7942 {
7943 	struct tog_reflist_entry *re;
7944 	int i = 0;
7945 
7946 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7947 		return;
7948 
7949 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7950 	while (i++ < maxscroll) {
7951 		if (re == NULL)
7952 			break;
7953 		s->first_displayed_entry = re;
7954 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7955 	}
7956 }
7957 
7958 static const struct got_error *
7959 ref_scroll_down(struct tog_view *view, int maxscroll)
7960 {
7961 	struct tog_ref_view_state *s = &view->state.ref;
7962 	struct tog_reflist_entry *next, *last;
7963 	int n = 0;
7964 
7965 	if (s->first_displayed_entry)
7966 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7967 	else
7968 		next = TAILQ_FIRST(&s->refs);
7969 
7970 	last = s->last_displayed_entry;
7971 	while (next && n++ < maxscroll) {
7972 		if (last) {
7973 			s->last_displayed_entry = last;
7974 			last = TAILQ_NEXT(last, entry);
7975 		}
7976 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7977 			s->first_displayed_entry = next;
7978 			next = TAILQ_NEXT(next, entry);
7979 		}
7980 	}
7981 
7982 	return NULL;
7983 }
7984 
7985 static const struct got_error *
7986 search_start_ref_view(struct tog_view *view)
7987 {
7988 	struct tog_ref_view_state *s = &view->state.ref;
7989 
7990 	s->matched_entry = NULL;
7991 	return NULL;
7992 }
7993 
7994 static int
7995 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7996 {
7997 	regmatch_t regmatch;
7998 
7999 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8000 	    0) == 0;
8001 }
8002 
8003 static const struct got_error *
8004 search_next_ref_view(struct tog_view *view)
8005 {
8006 	struct tog_ref_view_state *s = &view->state.ref;
8007 	struct tog_reflist_entry *re = NULL;
8008 
8009 	if (!view->searching) {
8010 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8011 		return NULL;
8012 	}
8013 
8014 	if (s->matched_entry) {
8015 		if (view->searching == TOG_SEARCH_FORWARD) {
8016 			if (s->selected_entry)
8017 				re = TAILQ_NEXT(s->selected_entry, entry);
8018 			else
8019 				re = TAILQ_PREV(s->selected_entry,
8020 				    tog_reflist_head, entry);
8021 		} else {
8022 			if (s->selected_entry == NULL)
8023 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8024 			else
8025 				re = TAILQ_PREV(s->selected_entry,
8026 				    tog_reflist_head, entry);
8027 		}
8028 	} else {
8029 		if (s->selected_entry)
8030 			re = s->selected_entry;
8031 		else if (view->searching == TOG_SEARCH_FORWARD)
8032 			re = TAILQ_FIRST(&s->refs);
8033 		else
8034 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8035 	}
8036 
8037 	while (1) {
8038 		if (re == NULL) {
8039 			if (s->matched_entry == NULL) {
8040 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8041 				return NULL;
8042 			}
8043 			if (view->searching == TOG_SEARCH_FORWARD)
8044 				re = TAILQ_FIRST(&s->refs);
8045 			else
8046 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8047 		}
8048 
8049 		if (match_reflist_entry(re, &view->regex)) {
8050 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8051 			s->matched_entry = re;
8052 			break;
8053 		}
8054 
8055 		if (view->searching == TOG_SEARCH_FORWARD)
8056 			re = TAILQ_NEXT(re, entry);
8057 		else
8058 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8059 	}
8060 
8061 	if (s->matched_entry) {
8062 		s->first_displayed_entry = s->matched_entry;
8063 		s->selected = 0;
8064 	}
8065 
8066 	return NULL;
8067 }
8068 
8069 static const struct got_error *
8070 show_ref_view(struct tog_view *view)
8071 {
8072 	const struct got_error *err = NULL;
8073 	struct tog_ref_view_state *s = &view->state.ref;
8074 	struct tog_reflist_entry *re;
8075 	char *line = NULL;
8076 	wchar_t *wline;
8077 	struct tog_color *tc;
8078 	int width, n, scrollx;
8079 	int limit = view->nlines;
8080 
8081 	werase(view->window);
8082 
8083 	s->ndisplayed = 0;
8084 	if (view_is_hsplit_top(view))
8085 		--limit;  /* border */
8086 
8087 	if (limit == 0)
8088 		return NULL;
8089 
8090 	re = s->first_displayed_entry;
8091 
8092 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8093 	    s->nrefs) == -1)
8094 		return got_error_from_errno("asprintf");
8095 
8096 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8097 	if (err) {
8098 		free(line);
8099 		return err;
8100 	}
8101 	if (view_needs_focus_indication(view))
8102 		wstandout(view->window);
8103 	waddwstr(view->window, wline);
8104 	while (width++ < view->ncols)
8105 		waddch(view->window, ' ');
8106 	if (view_needs_focus_indication(view))
8107 		wstandend(view->window);
8108 	free(wline);
8109 	wline = NULL;
8110 	free(line);
8111 	line = NULL;
8112 	if (--limit <= 0)
8113 		return NULL;
8114 
8115 	n = 0;
8116 	view->maxx = 0;
8117 	while (re && limit > 0) {
8118 		char *line = NULL;
8119 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8120 
8121 		if (s->show_date) {
8122 			struct got_commit_object *ci;
8123 			struct got_tag_object *tag;
8124 			struct got_object_id *id;
8125 			struct tm tm;
8126 			time_t t;
8127 
8128 			err = got_ref_resolve(&id, s->repo, re->ref);
8129 			if (err)
8130 				return err;
8131 			err = got_object_open_as_tag(&tag, s->repo, id);
8132 			if (err) {
8133 				if (err->code != GOT_ERR_OBJ_TYPE) {
8134 					free(id);
8135 					return err;
8136 				}
8137 				err = got_object_open_as_commit(&ci, s->repo,
8138 				    id);
8139 				if (err) {
8140 					free(id);
8141 					return err;
8142 				}
8143 				t = got_object_commit_get_committer_time(ci);
8144 				got_object_commit_close(ci);
8145 			} else {
8146 				t = got_object_tag_get_tagger_time(tag);
8147 				got_object_tag_close(tag);
8148 			}
8149 			free(id);
8150 			if (gmtime_r(&t, &tm) == NULL)
8151 				return got_error_from_errno("gmtime_r");
8152 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8153 				return got_error(GOT_ERR_NO_SPACE);
8154 		}
8155 		if (got_ref_is_symbolic(re->ref)) {
8156 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8157 			    ymd : "", got_ref_get_name(re->ref),
8158 			    got_ref_get_symref_target(re->ref)) == -1)
8159 				return got_error_from_errno("asprintf");
8160 		} else if (s->show_ids) {
8161 			struct got_object_id *id;
8162 			char *id_str;
8163 			err = got_ref_resolve(&id, s->repo, re->ref);
8164 			if (err)
8165 				return err;
8166 			err = got_object_id_str(&id_str, id);
8167 			if (err) {
8168 				free(id);
8169 				return err;
8170 			}
8171 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8172 			    got_ref_get_name(re->ref), id_str) == -1) {
8173 				err = got_error_from_errno("asprintf");
8174 				free(id);
8175 				free(id_str);
8176 				return err;
8177 			}
8178 			free(id);
8179 			free(id_str);
8180 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8181 		    got_ref_get_name(re->ref)) == -1)
8182 			return got_error_from_errno("asprintf");
8183 
8184 		/* use full line width to determine view->maxx */
8185 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8186 		if (err) {
8187 			free(line);
8188 			return err;
8189 		}
8190 		view->maxx = MAX(view->maxx, width);
8191 		free(wline);
8192 		wline = NULL;
8193 
8194 		err = format_line(&wline, &width, &scrollx, line, view->x,
8195 		    view->ncols, 0, 0);
8196 		if (err) {
8197 			free(line);
8198 			return err;
8199 		}
8200 		if (n == s->selected) {
8201 			if (view->focussed)
8202 				wstandout(view->window);
8203 			s->selected_entry = re;
8204 		}
8205 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8206 		if (tc)
8207 			wattr_on(view->window,
8208 			    COLOR_PAIR(tc->colorpair), NULL);
8209 		waddwstr(view->window, &wline[scrollx]);
8210 		if (tc)
8211 			wattr_off(view->window,
8212 			    COLOR_PAIR(tc->colorpair), NULL);
8213 		if (width < view->ncols)
8214 			waddch(view->window, '\n');
8215 		if (n == s->selected && view->focussed)
8216 			wstandend(view->window);
8217 		free(line);
8218 		free(wline);
8219 		wline = NULL;
8220 		n++;
8221 		s->ndisplayed++;
8222 		s->last_displayed_entry = re;
8223 
8224 		limit--;
8225 		re = TAILQ_NEXT(re, entry);
8226 	}
8227 
8228 	view_border(view);
8229 	return err;
8230 }
8231 
8232 static const struct got_error *
8233 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8234     struct tog_reflist_entry *re, struct got_repository *repo)
8235 {
8236 	const struct got_error *err = NULL;
8237 	struct got_object_id *commit_id = NULL;
8238 	struct tog_view *tree_view;
8239 
8240 	*new_view = NULL;
8241 
8242 	err = resolve_reflist_entry(&commit_id, re, repo);
8243 	if (err) {
8244 		if (err->code != GOT_ERR_OBJ_TYPE)
8245 			return err;
8246 		else
8247 			return NULL;
8248 	}
8249 
8250 
8251 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8252 	if (tree_view == NULL) {
8253 		err = got_error_from_errno("view_open");
8254 		goto done;
8255 	}
8256 
8257 	err = open_tree_view(tree_view, commit_id,
8258 	    got_ref_get_name(re->ref), repo);
8259 	if (err)
8260 		goto done;
8261 
8262 	*new_view = tree_view;
8263 done:
8264 	free(commit_id);
8265 	return err;
8266 }
8267 
8268 static const struct got_error *
8269 ref_goto_line(struct tog_view *view, int nlines)
8270 {
8271 	const struct got_error		*err = NULL;
8272 	struct tog_ref_view_state	*s = &view->state.ref;
8273 	int				 g, idx = s->selected_entry->idx;
8274 
8275 	g = view->gline;
8276 	view->gline = 0;
8277 
8278 	if (g == 0)
8279 		g = 1;
8280 	else if (g > s->nrefs)
8281 		g = s->nrefs;
8282 
8283 	if (g >= s->first_displayed_entry->idx + 1 &&
8284 	    g <= s->last_displayed_entry->idx + 1 &&
8285 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8286 		s->selected = g - s->first_displayed_entry->idx - 1;
8287 		return NULL;
8288 	}
8289 
8290 	if (idx + 1 < g) {
8291 		err = ref_scroll_down(view, g - idx - 1);
8292 		if (err)
8293 			return err;
8294 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8295 		    s->first_displayed_entry->idx + s->selected < g &&
8296 		    s->selected < s->ndisplayed - 1)
8297 			s->selected = g - s->first_displayed_entry->idx - 1;
8298 	} else if (idx + 1 > g)
8299 		ref_scroll_up(s, idx - g + 1);
8300 
8301 	if (g < nlines && s->first_displayed_entry->idx == 0)
8302 		s->selected = g - 1;
8303 
8304 	return NULL;
8305 
8306 }
8307 
8308 static const struct got_error *
8309 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8310 {
8311 	const struct got_error *err = NULL;
8312 	struct tog_ref_view_state *s = &view->state.ref;
8313 	struct tog_reflist_entry *re;
8314 	int n, nscroll = view->nlines - 1;
8315 
8316 	if (view->gline)
8317 		return ref_goto_line(view, nscroll);
8318 
8319 	switch (ch) {
8320 	case '0':
8321 	case '$':
8322 	case KEY_RIGHT:
8323 	case 'l':
8324 	case KEY_LEFT:
8325 	case 'h':
8326 		horizontal_scroll_input(view, ch);
8327 		break;
8328 	case 'i':
8329 		s->show_ids = !s->show_ids;
8330 		view->count = 0;
8331 		break;
8332 	case 'm':
8333 		s->show_date = !s->show_date;
8334 		view->count = 0;
8335 		break;
8336 	case 'o':
8337 		s->sort_by_date = !s->sort_by_date;
8338 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8339 		view->count = 0;
8340 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8341 		    got_ref_cmp_by_commit_timestamp_descending :
8342 		    tog_ref_cmp_by_name, s->repo);
8343 		if (err)
8344 			break;
8345 		got_reflist_object_id_map_free(tog_refs_idmap);
8346 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8347 		    &tog_refs, s->repo);
8348 		if (err)
8349 			break;
8350 		ref_view_free_refs(s);
8351 		err = ref_view_load_refs(s);
8352 		break;
8353 	case KEY_ENTER:
8354 	case '\r':
8355 		view->count = 0;
8356 		if (!s->selected_entry)
8357 			break;
8358 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8359 		break;
8360 	case 'T':
8361 		view->count = 0;
8362 		if (!s->selected_entry)
8363 			break;
8364 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8365 		break;
8366 	case 'g':
8367 	case '=':
8368 	case KEY_HOME:
8369 		s->selected = 0;
8370 		view->count = 0;
8371 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8372 		break;
8373 	case 'G':
8374 	case '*':
8375 	case KEY_END: {
8376 		int eos = view->nlines - 1;
8377 
8378 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8379 			--eos;  /* border */
8380 		s->selected = 0;
8381 		view->count = 0;
8382 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8383 		for (n = 0; n < eos; n++) {
8384 			if (re == NULL)
8385 				break;
8386 			s->first_displayed_entry = re;
8387 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8388 		}
8389 		if (n > 0)
8390 			s->selected = n - 1;
8391 		break;
8392 	}
8393 	case 'k':
8394 	case KEY_UP:
8395 	case CTRL('p'):
8396 		if (s->selected > 0) {
8397 			s->selected--;
8398 			break;
8399 		}
8400 		ref_scroll_up(s, 1);
8401 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8402 			view->count = 0;
8403 		break;
8404 	case CTRL('u'):
8405 	case 'u':
8406 		nscroll /= 2;
8407 		/* FALL THROUGH */
8408 	case KEY_PPAGE:
8409 	case CTRL('b'):
8410 	case 'b':
8411 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8412 			s->selected -= MIN(nscroll, s->selected);
8413 		ref_scroll_up(s, MAX(0, nscroll));
8414 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8415 			view->count = 0;
8416 		break;
8417 	case 'j':
8418 	case KEY_DOWN:
8419 	case CTRL('n'):
8420 		if (s->selected < s->ndisplayed - 1) {
8421 			s->selected++;
8422 			break;
8423 		}
8424 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8425 			/* can't scroll any further */
8426 			view->count = 0;
8427 			break;
8428 		}
8429 		ref_scroll_down(view, 1);
8430 		break;
8431 	case CTRL('d'):
8432 	case 'd':
8433 		nscroll /= 2;
8434 		/* FALL THROUGH */
8435 	case KEY_NPAGE:
8436 	case CTRL('f'):
8437 	case 'f':
8438 	case ' ':
8439 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8440 			/* can't scroll any further; move cursor down */
8441 			if (s->selected < s->ndisplayed - 1)
8442 				s->selected += MIN(nscroll,
8443 				    s->ndisplayed - s->selected - 1);
8444 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8445 				s->selected += s->ndisplayed - s->selected - 1;
8446 			view->count = 0;
8447 			break;
8448 		}
8449 		ref_scroll_down(view, nscroll);
8450 		break;
8451 	case CTRL('l'):
8452 		view->count = 0;
8453 		tog_free_refs();
8454 		err = tog_load_refs(s->repo, s->sort_by_date);
8455 		if (err)
8456 			break;
8457 		ref_view_free_refs(s);
8458 		err = ref_view_load_refs(s);
8459 		break;
8460 	case KEY_RESIZE:
8461 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8462 			s->selected = view->nlines - 2;
8463 		break;
8464 	default:
8465 		view->count = 0;
8466 		break;
8467 	}
8468 
8469 	return err;
8470 }
8471 
8472 __dead static void
8473 usage_ref(void)
8474 {
8475 	endwin();
8476 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8477 	    getprogname());
8478 	exit(1);
8479 }
8480 
8481 static const struct got_error *
8482 cmd_ref(int argc, char *argv[])
8483 {
8484 	const struct got_error *error;
8485 	struct got_repository *repo = NULL;
8486 	struct got_worktree *worktree = NULL;
8487 	char *cwd = NULL, *repo_path = NULL;
8488 	int ch;
8489 	struct tog_view *view;
8490 	int *pack_fds = NULL;
8491 
8492 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8493 		switch (ch) {
8494 		case 'r':
8495 			repo_path = realpath(optarg, NULL);
8496 			if (repo_path == NULL)
8497 				return got_error_from_errno2("realpath",
8498 				    optarg);
8499 			break;
8500 		default:
8501 			usage_ref();
8502 			/* NOTREACHED */
8503 		}
8504 	}
8505 
8506 	argc -= optind;
8507 	argv += optind;
8508 
8509 	if (argc > 1)
8510 		usage_ref();
8511 
8512 	error = got_repo_pack_fds_open(&pack_fds);
8513 	if (error != NULL)
8514 		goto done;
8515 
8516 	if (repo_path == NULL) {
8517 		cwd = getcwd(NULL, 0);
8518 		if (cwd == NULL)
8519 			return got_error_from_errno("getcwd");
8520 		error = got_worktree_open(&worktree, cwd);
8521 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8522 			goto done;
8523 		if (worktree)
8524 			repo_path =
8525 			    strdup(got_worktree_get_repo_path(worktree));
8526 		else
8527 			repo_path = strdup(cwd);
8528 		if (repo_path == NULL) {
8529 			error = got_error_from_errno("strdup");
8530 			goto done;
8531 		}
8532 	}
8533 
8534 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8535 	if (error != NULL)
8536 		goto done;
8537 
8538 	init_curses();
8539 
8540 	error = apply_unveil(got_repo_get_path(repo), NULL);
8541 	if (error)
8542 		goto done;
8543 
8544 	error = tog_load_refs(repo, 0);
8545 	if (error)
8546 		goto done;
8547 
8548 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8549 	if (view == NULL) {
8550 		error = got_error_from_errno("view_open");
8551 		goto done;
8552 	}
8553 
8554 	error = open_ref_view(view, repo);
8555 	if (error)
8556 		goto done;
8557 
8558 	if (worktree) {
8559 		/* Release work tree lock. */
8560 		got_worktree_close(worktree);
8561 		worktree = NULL;
8562 	}
8563 	error = view_loop(view);
8564 done:
8565 	free(repo_path);
8566 	free(cwd);
8567 	if (repo) {
8568 		const struct got_error *close_err = got_repo_close(repo);
8569 		if (close_err)
8570 			error = close_err;
8571 	}
8572 	if (pack_fds) {
8573 		const struct got_error *pack_err =
8574 		    got_repo_pack_fds_close(pack_fds);
8575 		if (error == NULL)
8576 			error = pack_err;
8577 	}
8578 	tog_free_refs();
8579 	return error;
8580 }
8581 
8582 static const struct got_error*
8583 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8584     const char *str)
8585 {
8586 	size_t len;
8587 
8588 	if (win == NULL)
8589 		win = stdscr;
8590 
8591 	len = strlen(str);
8592 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8593 
8594 	if (focus)
8595 		wstandout(win);
8596 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8597 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8598 	if (focus)
8599 		wstandend(win);
8600 
8601 	return NULL;
8602 }
8603 
8604 static const struct got_error *
8605 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8606 {
8607 	off_t *p;
8608 
8609 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8610 	if (p == NULL) {
8611 		free(*line_offsets);
8612 		*line_offsets = NULL;
8613 		return got_error_from_errno("reallocarray");
8614 	}
8615 
8616 	*line_offsets = p;
8617 	(*line_offsets)[*nlines] = off;
8618 	++(*nlines);
8619 	return NULL;
8620 }
8621 
8622 static const struct got_error *
8623 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8624 {
8625 	*ret = 0;
8626 
8627 	for (;n > 0; --n, ++km) {
8628 		char	*t0, *t, *k;
8629 		size_t	 len = 1;
8630 
8631 		if (km->keys == NULL)
8632 			continue;
8633 
8634 		t = t0 = strdup(km->keys);
8635 		if (t0 == NULL)
8636 			return got_error_from_errno("strdup");
8637 
8638 		len += strlen(t);
8639 		while ((k = strsep(&t, " ")) != NULL)
8640 			len += strlen(k) > 1 ? 2 : 0;
8641 		free(t0);
8642 		*ret = MAX(*ret, len);
8643 	}
8644 
8645 	return NULL;
8646 }
8647 
8648 /*
8649  * Write keymap section headers, keys, and key info in km to f.
8650  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8651  * wrap control and symbolic keys in guillemets, else use <>.
8652  */
8653 static const struct got_error *
8654 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8655 {
8656 	int n, len = width;
8657 
8658 	if (km->keys) {
8659 		static const char *u8_glyph[] = {
8660 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8661 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8662 		};
8663 		char	*t0, *t, *k;
8664 		int	 cs, s, first = 1;
8665 
8666 		cs = got_locale_is_utf8();
8667 
8668 		t = t0 = strdup(km->keys);
8669 		if (t0 == NULL)
8670 			return got_error_from_errno("strdup");
8671 
8672 		len = strlen(km->keys);
8673 		while ((k = strsep(&t, " ")) != NULL) {
8674 			s = strlen(k) > 1;  /* control or symbolic key */
8675 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8676 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8677 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8678 			if (n < 0) {
8679 				free(t0);
8680 				return got_error_from_errno("fprintf");
8681 			}
8682 			first = 0;
8683 			len += s ? 2 : 0;
8684 			*off += n;
8685 		}
8686 		free(t0);
8687 	}
8688 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8689 	if (n < 0)
8690 		return got_error_from_errno("fprintf");
8691 	*off += n;
8692 
8693 	return NULL;
8694 }
8695 
8696 static const struct got_error *
8697 format_help(struct tog_help_view_state *s)
8698 {
8699 	const struct got_error		*err = NULL;
8700 	off_t				 off = 0;
8701 	int				 i, max, n, show = s->all;
8702 	static const struct tog_key_map	 km[] = {
8703 #define KEYMAP_(info, type)	{ NULL, (info), type }
8704 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8705 		GENERATE_HELP
8706 #undef KEYMAP_
8707 #undef KEY_
8708 	};
8709 
8710 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8711 	if (err)
8712 		return err;
8713 
8714 	n = nitems(km);
8715 	err = max_key_str(&max, km, n);
8716 	if (err)
8717 		return err;
8718 
8719 	for (i = 0; i < n; ++i) {
8720 		if (km[i].keys == NULL) {
8721 			show = s->all;
8722 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8723 			    km[i].type == s->type || s->all)
8724 				show = 1;
8725 		}
8726 		if (show) {
8727 			err = format_help_line(&off, s->f, &km[i], max);
8728 			if (err)
8729 				return err;
8730 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8731 			if (err)
8732 				return err;
8733 		}
8734 	}
8735 	fputc('\n', s->f);
8736 	++off;
8737 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8738 	return err;
8739 }
8740 
8741 static const struct got_error *
8742 create_help(struct tog_help_view_state *s)
8743 {
8744 	FILE			*f;
8745 	const struct got_error	*err;
8746 
8747 	free(s->line_offsets);
8748 	s->line_offsets = NULL;
8749 	s->nlines = 0;
8750 
8751 	f = got_opentemp();
8752 	if (f == NULL)
8753 		return got_error_from_errno("got_opentemp");
8754 	s->f = f;
8755 
8756 	err = format_help(s);
8757 	if (err)
8758 		return err;
8759 
8760 	if (s->f && fflush(s->f) != 0)
8761 		return got_error_from_errno("fflush");
8762 
8763 	return NULL;
8764 }
8765 
8766 static const struct got_error *
8767 search_start_help_view(struct tog_view *view)
8768 {
8769 	view->state.help.matched_line = 0;
8770 	return NULL;
8771 }
8772 
8773 static void
8774 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8775     size_t *nlines, int **first, int **last, int **match, int **selected)
8776 {
8777 	struct tog_help_view_state *s = &view->state.help;
8778 
8779 	*f = s->f;
8780 	*nlines = s->nlines;
8781 	*line_offsets = s->line_offsets;
8782 	*match = &s->matched_line;
8783 	*first = &s->first_displayed_line;
8784 	*last = &s->last_displayed_line;
8785 	*selected = &s->selected_line;
8786 }
8787 
8788 static const struct got_error *
8789 show_help_view(struct tog_view *view)
8790 {
8791 	struct tog_help_view_state	*s = &view->state.help;
8792 	const struct got_error		*err;
8793 	regmatch_t			*regmatch = &view->regmatch;
8794 	wchar_t				*wline;
8795 	char				*line;
8796 	ssize_t				 linelen;
8797 	size_t				 linesz = 0;
8798 	int				 width, nprinted = 0, rc = 0;
8799 	int				 eos = view->nlines;
8800 
8801 	if (view_is_hsplit_top(view))
8802 		--eos;  /* account for border */
8803 
8804 	s->lineno = 0;
8805 	rewind(s->f);
8806 	werase(view->window);
8807 
8808 	if (view->gline > s->nlines - 1)
8809 		view->gline = s->nlines - 1;
8810 
8811 	err = win_draw_center(view->window, 0, 0, view->ncols,
8812 	    view_needs_focus_indication(view),
8813 	    "tog help (press q to return to tog)");
8814 	if (err)
8815 		return err;
8816 	if (eos <= 1)
8817 		return NULL;
8818 	waddstr(view->window, "\n\n");
8819 	eos -= 2;
8820 
8821 	s->eof = 0;
8822 	view->maxx = 0;
8823 	line = NULL;
8824 	while (eos > 0 && nprinted < eos) {
8825 		attr_t attr = 0;
8826 
8827 		linelen = getline(&line, &linesz, s->f);
8828 		if (linelen == -1) {
8829 			if (!feof(s->f)) {
8830 				free(line);
8831 				return got_ferror(s->f, GOT_ERR_IO);
8832 			}
8833 			s->eof = 1;
8834 			break;
8835 		}
8836 		if (++s->lineno < s->first_displayed_line)
8837 			continue;
8838 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8839 			continue;
8840 		if (s->lineno == view->hiline)
8841 			attr = A_STANDOUT;
8842 
8843 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8844 		    view->x ? 1 : 0);
8845 		if (err) {
8846 			free(line);
8847 			return err;
8848 		}
8849 		view->maxx = MAX(view->maxx, width);
8850 		free(wline);
8851 		wline = NULL;
8852 
8853 		if (attr)
8854 			wattron(view->window, attr);
8855 		if (s->first_displayed_line + nprinted == s->matched_line &&
8856 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8857 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8858 			    view->window, view->x, regmatch);
8859 			if (err) {
8860 				free(line);
8861 				return err;
8862 			}
8863 		} else {
8864 			int skip;
8865 
8866 			err = format_line(&wline, &width, &skip, line,
8867 			    view->x, view->ncols, 0, view->x ? 1 : 0);
8868 			if (err) {
8869 				free(line);
8870 				return err;
8871 			}
8872 			waddwstr(view->window, &wline[skip]);
8873 			free(wline);
8874 			wline = NULL;
8875 		}
8876 		if (s->lineno == view->hiline) {
8877 			while (width++ < view->ncols)
8878 				waddch(view->window, ' ');
8879 		} else {
8880 			if (width < view->ncols)
8881 				waddch(view->window, '\n');
8882 		}
8883 		if (attr)
8884 			wattroff(view->window, attr);
8885 		if (++nprinted == 1)
8886 			s->first_displayed_line = s->lineno;
8887 	}
8888 	free(line);
8889 	if (nprinted > 0)
8890 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8891 	else
8892 		s->last_displayed_line = s->first_displayed_line;
8893 
8894 	view_border(view);
8895 
8896 	if (s->eof) {
8897 		rc = waddnstr(view->window,
8898 		    "See the tog(1) manual page for full documentation",
8899 		    view->ncols - 1);
8900 		if (rc == ERR)
8901 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8902 	} else {
8903 		wmove(view->window, view->nlines - 1, 0);
8904 		wclrtoeol(view->window);
8905 		wstandout(view->window);
8906 		rc = waddnstr(view->window, "scroll down for more...",
8907 		    view->ncols - 1);
8908 		if (rc == ERR)
8909 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8910 		if (getcurx(view->window) < view->ncols - 6) {
8911 			rc = wprintw(view->window, "[%.0f%%]",
8912 			    100.00 * s->last_displayed_line / s->nlines);
8913 			if (rc == ERR)
8914 				return got_error_msg(GOT_ERR_IO, "wprintw");
8915 		}
8916 		wstandend(view->window);
8917 	}
8918 
8919 	return NULL;
8920 }
8921 
8922 static const struct got_error *
8923 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8924 {
8925 	struct tog_help_view_state	*s = &view->state.help;
8926 	const struct got_error		*err = NULL;
8927 	char				*line = NULL;
8928 	ssize_t				 linelen;
8929 	size_t				 linesz = 0;
8930 	int				 eos, nscroll;
8931 
8932 	eos = nscroll = view->nlines;
8933 	if (view_is_hsplit_top(view))
8934 		--eos;  /* border */
8935 
8936 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8937 
8938 	switch (ch) {
8939 	case '0':
8940 	case '$':
8941 	case KEY_RIGHT:
8942 	case 'l':
8943 	case KEY_LEFT:
8944 	case 'h':
8945 		horizontal_scroll_input(view, ch);
8946 		break;
8947 	case 'g':
8948 	case KEY_HOME:
8949 		s->first_displayed_line = 1;
8950 		view->count = 0;
8951 		break;
8952 	case 'G':
8953 	case KEY_END:
8954 		view->count = 0;
8955 		if (s->eof)
8956 			break;
8957 		s->first_displayed_line = (s->nlines - eos) + 3;
8958 		s->eof = 1;
8959 		break;
8960 	case 'k':
8961 	case KEY_UP:
8962 		if (s->first_displayed_line > 1)
8963 			--s->first_displayed_line;
8964 		else
8965 			view->count = 0;
8966 		break;
8967 	case CTRL('u'):
8968 	case 'u':
8969 		nscroll /= 2;
8970 		/* FALL THROUGH */
8971 	case KEY_PPAGE:
8972 	case CTRL('b'):
8973 	case 'b':
8974 		if (s->first_displayed_line == 1) {
8975 			view->count = 0;
8976 			break;
8977 		}
8978 		while (--nscroll > 0 && s->first_displayed_line > 1)
8979 			s->first_displayed_line--;
8980 		break;
8981 	case 'j':
8982 	case KEY_DOWN:
8983 	case CTRL('n'):
8984 		if (!s->eof)
8985 			++s->first_displayed_line;
8986 		else
8987 			view->count = 0;
8988 		break;
8989 	case CTRL('d'):
8990 	case 'd':
8991 		nscroll /= 2;
8992 		/* FALL THROUGH */
8993 	case KEY_NPAGE:
8994 	case CTRL('f'):
8995 	case 'f':
8996 	case ' ':
8997 		if (s->eof) {
8998 			view->count = 0;
8999 			break;
9000 		}
9001 		while (!s->eof && --nscroll > 0) {
9002 			linelen = getline(&line, &linesz, s->f);
9003 			s->first_displayed_line++;
9004 			if (linelen == -1) {
9005 				if (feof(s->f))
9006 					s->eof = 1;
9007 				else
9008 					err = got_ferror(s->f, GOT_ERR_IO);
9009 				break;
9010 			}
9011 		}
9012 		free(line);
9013 		break;
9014 	default:
9015 		view->count = 0;
9016 		break;
9017 	}
9018 
9019 	return err;
9020 }
9021 
9022 static const struct got_error *
9023 close_help_view(struct tog_view *view)
9024 {
9025 	struct tog_help_view_state *s = &view->state.help;
9026 
9027 	free(s->line_offsets);
9028 	s->line_offsets = NULL;
9029 	if (fclose(s->f) == EOF)
9030 		return got_error_from_errno("fclose");
9031 
9032 	return NULL;
9033 }
9034 
9035 static const struct got_error *
9036 reset_help_view(struct tog_view *view)
9037 {
9038 	struct tog_help_view_state *s = &view->state.help;
9039 
9040 
9041 	if (s->f && fclose(s->f) == EOF)
9042 		return got_error_from_errno("fclose");
9043 
9044 	wclear(view->window);
9045 	view->count = 0;
9046 	view->x = 0;
9047 	s->all = !s->all;
9048 	s->first_displayed_line = 1;
9049 	s->last_displayed_line = view->nlines;
9050 	s->matched_line = 0;
9051 
9052 	return create_help(s);
9053 }
9054 
9055 static const struct got_error *
9056 open_help_view(struct tog_view *view, struct tog_view *parent)
9057 {
9058 	const struct got_error		*err = NULL;
9059 	struct tog_help_view_state	*s = &view->state.help;
9060 
9061 	s->type = (enum tog_keymap_type)parent->type;
9062 	s->first_displayed_line = 1;
9063 	s->last_displayed_line = view->nlines;
9064 	s->selected_line = 1;
9065 
9066 	view->show = show_help_view;
9067 	view->input = input_help_view;
9068 	view->reset = reset_help_view;
9069 	view->close = close_help_view;
9070 	view->search_start = search_start_help_view;
9071 	view->search_setup = search_setup_help_view;
9072 	view->search_next = search_next_view_match;
9073 
9074 	err = create_help(s);
9075 	return err;
9076 }
9077 
9078 static const struct got_error *
9079 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9080     enum tog_view_type request, int y, int x)
9081 {
9082 	const struct got_error *err = NULL;
9083 
9084 	*new_view = NULL;
9085 
9086 	switch (request) {
9087 	case TOG_VIEW_DIFF:
9088 		if (view->type == TOG_VIEW_LOG) {
9089 			struct tog_log_view_state *s = &view->state.log;
9090 
9091 			err = open_diff_view_for_commit(new_view, y, x,
9092 			    s->selected_entry->commit, s->selected_entry->id,
9093 			    view, s->repo);
9094 		} else
9095 			return got_error_msg(GOT_ERR_NOT_IMPL,
9096 			    "parent/child view pair not supported");
9097 		break;
9098 	case TOG_VIEW_BLAME:
9099 		if (view->type == TOG_VIEW_TREE) {
9100 			struct tog_tree_view_state *s = &view->state.tree;
9101 
9102 			err = blame_tree_entry(new_view, y, x,
9103 			    s->selected_entry, &s->parents, s->commit_id,
9104 			    s->repo);
9105 		} else
9106 			return got_error_msg(GOT_ERR_NOT_IMPL,
9107 			    "parent/child view pair not supported");
9108 		break;
9109 	case TOG_VIEW_LOG:
9110 		if (view->type == TOG_VIEW_BLAME)
9111 			err = log_annotated_line(new_view, y, x,
9112 			    view->state.blame.repo, view->state.blame.id_to_log);
9113 		else if (view->type == TOG_VIEW_TREE)
9114 			err = log_selected_tree_entry(new_view, y, x,
9115 			    &view->state.tree);
9116 		else if (view->type == TOG_VIEW_REF)
9117 			err = log_ref_entry(new_view, y, x,
9118 			    view->state.ref.selected_entry,
9119 			    view->state.ref.repo);
9120 		else
9121 			return got_error_msg(GOT_ERR_NOT_IMPL,
9122 			    "parent/child view pair not supported");
9123 		break;
9124 	case TOG_VIEW_TREE:
9125 		if (view->type == TOG_VIEW_LOG)
9126 			err = browse_commit_tree(new_view, y, x,
9127 			    view->state.log.selected_entry,
9128 			    view->state.log.in_repo_path,
9129 			    view->state.log.head_ref_name,
9130 			    view->state.log.repo);
9131 		else if (view->type == TOG_VIEW_REF)
9132 			err = browse_ref_tree(new_view, y, x,
9133 			    view->state.ref.selected_entry,
9134 			    view->state.ref.repo);
9135 		else
9136 			return got_error_msg(GOT_ERR_NOT_IMPL,
9137 			    "parent/child view pair not supported");
9138 		break;
9139 	case TOG_VIEW_REF:
9140 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9141 		if (*new_view == NULL)
9142 			return got_error_from_errno("view_open");
9143 		if (view->type == TOG_VIEW_LOG)
9144 			err = open_ref_view(*new_view, view->state.log.repo);
9145 		else if (view->type == TOG_VIEW_TREE)
9146 			err = open_ref_view(*new_view, view->state.tree.repo);
9147 		else
9148 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9149 			    "parent/child view pair not supported");
9150 		if (err)
9151 			view_close(*new_view);
9152 		break;
9153 	case TOG_VIEW_HELP:
9154 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9155 		if (*new_view == NULL)
9156 			return got_error_from_errno("view_open");
9157 		err = open_help_view(*new_view, view);
9158 		if (err)
9159 			view_close(*new_view);
9160 		break;
9161 	default:
9162 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9163 	}
9164 
9165 	return err;
9166 }
9167 
9168 /*
9169  * If view was scrolled down to move the selected line into view when opening a
9170  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9171  */
9172 static void
9173 offset_selection_up(struct tog_view *view)
9174 {
9175 	switch (view->type) {
9176 	case TOG_VIEW_BLAME: {
9177 		struct tog_blame_view_state *s = &view->state.blame;
9178 		if (s->first_displayed_line == 1) {
9179 			s->selected_line = MAX(s->selected_line - view->offset,
9180 			    1);
9181 			break;
9182 		}
9183 		if (s->first_displayed_line > view->offset)
9184 			s->first_displayed_line -= view->offset;
9185 		else
9186 			s->first_displayed_line = 1;
9187 		s->selected_line += view->offset;
9188 		break;
9189 	}
9190 	case TOG_VIEW_LOG:
9191 		log_scroll_up(&view->state.log, view->offset);
9192 		view->state.log.selected += view->offset;
9193 		break;
9194 	case TOG_VIEW_REF:
9195 		ref_scroll_up(&view->state.ref, view->offset);
9196 		view->state.ref.selected += view->offset;
9197 		break;
9198 	case TOG_VIEW_TREE:
9199 		tree_scroll_up(&view->state.tree, view->offset);
9200 		view->state.tree.selected += view->offset;
9201 		break;
9202 	default:
9203 		break;
9204 	}
9205 
9206 	view->offset = 0;
9207 }
9208 
9209 /*
9210  * If the selected line is in the section of screen covered by the bottom split,
9211  * scroll down offset lines to move it into view and index its new position.
9212  */
9213 static const struct got_error *
9214 offset_selection_down(struct tog_view *view)
9215 {
9216 	const struct got_error	*err = NULL;
9217 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9218 	int			*selected = NULL;
9219 	int			 header, offset;
9220 
9221 	switch (view->type) {
9222 	case TOG_VIEW_BLAME: {
9223 		struct tog_blame_view_state *s = &view->state.blame;
9224 		header = 3;
9225 		scrolld = NULL;
9226 		if (s->selected_line > view->nlines - header) {
9227 			offset = abs(view->nlines - s->selected_line - header);
9228 			s->first_displayed_line += offset;
9229 			s->selected_line -= offset;
9230 			view->offset = offset;
9231 		}
9232 		break;
9233 	}
9234 	case TOG_VIEW_LOG: {
9235 		struct tog_log_view_state *s = &view->state.log;
9236 		scrolld = &log_scroll_down;
9237 		header = view_is_parent_view(view) ? 3 : 2;
9238 		selected = &s->selected;
9239 		break;
9240 	}
9241 	case TOG_VIEW_REF: {
9242 		struct tog_ref_view_state *s = &view->state.ref;
9243 		scrolld = &ref_scroll_down;
9244 		header = 3;
9245 		selected = &s->selected;
9246 		break;
9247 	}
9248 	case TOG_VIEW_TREE: {
9249 		struct tog_tree_view_state *s = &view->state.tree;
9250 		scrolld = &tree_scroll_down;
9251 		header = 5;
9252 		selected = &s->selected;
9253 		break;
9254 	}
9255 	default:
9256 		selected = NULL;
9257 		scrolld = NULL;
9258 		header = 0;
9259 		break;
9260 	}
9261 
9262 	if (selected && *selected > view->nlines - header) {
9263 		offset = abs(view->nlines - *selected - header);
9264 		view->offset = offset;
9265 		if (scrolld && offset) {
9266 			err = scrolld(view, offset);
9267 			*selected -= offset;
9268 		}
9269 	}
9270 
9271 	return err;
9272 }
9273 
9274 static void
9275 list_commands(FILE *fp)
9276 {
9277 	size_t i;
9278 
9279 	fprintf(fp, "commands:");
9280 	for (i = 0; i < nitems(tog_commands); i++) {
9281 		const struct tog_cmd *cmd = &tog_commands[i];
9282 		fprintf(fp, " %s", cmd->name);
9283 	}
9284 	fputc('\n', fp);
9285 }
9286 
9287 __dead static void
9288 usage(int hflag, int status)
9289 {
9290 	FILE *fp = (status == 0) ? stdout : stderr;
9291 
9292 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9293 	    getprogname());
9294 	if (hflag) {
9295 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9296 		list_commands(fp);
9297 	}
9298 	exit(status);
9299 }
9300 
9301 static char **
9302 make_argv(int argc, ...)
9303 {
9304 	va_list ap;
9305 	char **argv;
9306 	int i;
9307 
9308 	va_start(ap, argc);
9309 
9310 	argv = calloc(argc, sizeof(char *));
9311 	if (argv == NULL)
9312 		err(1, "calloc");
9313 	for (i = 0; i < argc; i++) {
9314 		argv[i] = strdup(va_arg(ap, char *));
9315 		if (argv[i] == NULL)
9316 			err(1, "strdup");
9317 	}
9318 
9319 	va_end(ap);
9320 	return argv;
9321 }
9322 
9323 /*
9324  * Try to convert 'tog path' into a 'tog log path' command.
9325  * The user could simply have mistyped the command rather than knowingly
9326  * provided a path. So check whether argv[0] can in fact be resolved
9327  * to a path in the HEAD commit and print a special error if not.
9328  * This hack is for mpi@ <3
9329  */
9330 static const struct got_error *
9331 tog_log_with_path(int argc, char *argv[])
9332 {
9333 	const struct got_error *error = NULL, *close_err;
9334 	const struct tog_cmd *cmd = NULL;
9335 	struct got_repository *repo = NULL;
9336 	struct got_worktree *worktree = NULL;
9337 	struct got_object_id *commit_id = NULL, *id = NULL;
9338 	struct got_commit_object *commit = NULL;
9339 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9340 	char *commit_id_str = NULL, **cmd_argv = NULL;
9341 	int *pack_fds = NULL;
9342 
9343 	cwd = getcwd(NULL, 0);
9344 	if (cwd == NULL)
9345 		return got_error_from_errno("getcwd");
9346 
9347 	error = got_repo_pack_fds_open(&pack_fds);
9348 	if (error != NULL)
9349 		goto done;
9350 
9351 	error = got_worktree_open(&worktree, cwd);
9352 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9353 		goto done;
9354 
9355 	if (worktree)
9356 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9357 	else
9358 		repo_path = strdup(cwd);
9359 	if (repo_path == NULL) {
9360 		error = got_error_from_errno("strdup");
9361 		goto done;
9362 	}
9363 
9364 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9365 	if (error != NULL)
9366 		goto done;
9367 
9368 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9369 	    repo, worktree);
9370 	if (error)
9371 		goto done;
9372 
9373 	error = tog_load_refs(repo, 0);
9374 	if (error)
9375 		goto done;
9376 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9377 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9378 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9379 	if (error)
9380 		goto done;
9381 
9382 	if (worktree) {
9383 		got_worktree_close(worktree);
9384 		worktree = NULL;
9385 	}
9386 
9387 	error = got_object_open_as_commit(&commit, repo, commit_id);
9388 	if (error)
9389 		goto done;
9390 
9391 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9392 	if (error) {
9393 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9394 			goto done;
9395 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9396 		    getprogname(), argv[0]);
9397 		usage(1, 1);
9398 		/* not reached */
9399 	}
9400 
9401 	error = got_object_id_str(&commit_id_str, commit_id);
9402 	if (error)
9403 		goto done;
9404 
9405 	cmd = &tog_commands[0]; /* log */
9406 	argc = 4;
9407 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9408 	error = cmd->cmd_main(argc, cmd_argv);
9409 done:
9410 	if (repo) {
9411 		close_err = got_repo_close(repo);
9412 		if (error == NULL)
9413 			error = close_err;
9414 	}
9415 	if (commit)
9416 		got_object_commit_close(commit);
9417 	if (worktree)
9418 		got_worktree_close(worktree);
9419 	if (pack_fds) {
9420 		const struct got_error *pack_err =
9421 		    got_repo_pack_fds_close(pack_fds);
9422 		if (error == NULL)
9423 			error = pack_err;
9424 	}
9425 	free(id);
9426 	free(commit_id_str);
9427 	free(commit_id);
9428 	free(cwd);
9429 	free(repo_path);
9430 	free(in_repo_path);
9431 	if (cmd_argv) {
9432 		int i;
9433 		for (i = 0; i < argc; i++)
9434 			free(cmd_argv[i]);
9435 		free(cmd_argv);
9436 	}
9437 	tog_free_refs();
9438 	return error;
9439 }
9440 
9441 int
9442 main(int argc, char *argv[])
9443 {
9444 	const struct got_error *error = NULL;
9445 	const struct tog_cmd *cmd = NULL;
9446 	int ch, hflag = 0, Vflag = 0;
9447 	char **cmd_argv = NULL;
9448 	static const struct option longopts[] = {
9449 	    { "version", no_argument, NULL, 'V' },
9450 	    { NULL, 0, NULL, 0}
9451 	};
9452 	char *diff_algo_str = NULL;
9453 
9454 	setlocale(LC_CTYPE, "");
9455 
9456 #ifndef PROFILE
9457 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9458 	    NULL) == -1)
9459 		err(1, "pledge");
9460 #endif
9461 
9462 	if (!isatty(STDIN_FILENO))
9463 		errx(1, "standard input is not a tty");
9464 
9465 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9466 		switch (ch) {
9467 		case 'h':
9468 			hflag = 1;
9469 			break;
9470 		case 'V':
9471 			Vflag = 1;
9472 			break;
9473 		default:
9474 			usage(hflag, 1);
9475 			/* NOTREACHED */
9476 		}
9477 	}
9478 
9479 	argc -= optind;
9480 	argv += optind;
9481 	optind = 1;
9482 	optreset = 1;
9483 
9484 	if (Vflag) {
9485 		got_version_print_str();
9486 		return 0;
9487 	}
9488 
9489 	if (argc == 0) {
9490 		if (hflag)
9491 			usage(hflag, 0);
9492 		/* Build an argument vector which runs a default command. */
9493 		cmd = &tog_commands[0];
9494 		argc = 1;
9495 		cmd_argv = make_argv(argc, cmd->name);
9496 	} else {
9497 		size_t i;
9498 
9499 		/* Did the user specify a command? */
9500 		for (i = 0; i < nitems(tog_commands); i++) {
9501 			if (strncmp(tog_commands[i].name, argv[0],
9502 			    strlen(argv[0])) == 0) {
9503 				cmd = &tog_commands[i];
9504 				break;
9505 			}
9506 		}
9507 	}
9508 
9509 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9510 	if (diff_algo_str) {
9511 		if (strcasecmp(diff_algo_str, "patience") == 0)
9512 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9513 		if (strcasecmp(diff_algo_str, "myers") == 0)
9514 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9515 	}
9516 
9517 	if (cmd == NULL) {
9518 		if (argc != 1)
9519 			usage(0, 1);
9520 		/* No command specified; try log with a path */
9521 		error = tog_log_with_path(argc, argv);
9522 	} else {
9523 		if (hflag)
9524 			cmd->cmd_usage();
9525 		else
9526 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9527 	}
9528 
9529 	endwin();
9530 	if (cmd_argv) {
9531 		int i;
9532 		for (i = 0; i < argc; i++)
9533 			free(cmd_argv[i]);
9534 		free(cmd_argv);
9535 	}
9536 
9537 	if (error && error->code != GOT_ERR_CANCELLED &&
9538 	    error->code != GOT_ERR_EOF &&
9539 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9540 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9541 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9542 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9543 	return 0;
9544 }